2bbe8ffc9d
for a long time and is run in production use. This is the code present in portversion 2.03 with some additional tweaks. The rather extensive diff accounts for: - locking (to enable pf to work with a giant-free netstack) - byte order difference between OpenBSD and FreeBSD for ip_len/ip_off - conversion from pool(9) to zone(9) - api differences etc. Approved by: bms(mentor) (in general)
6056 lines
151 KiB
C
6056 lines
151 KiB
C
/* $FreeBSD$ */
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/* $OpenBSD: pf.c,v 1.390 2003/09/24 17:18:03 mcbride Exp $ */
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/*
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* Copyright (c) 2001 Daniel Hartmeier
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* - Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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* Effort sponsored in part by the Defense Advanced Research Projects
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* Agency (DARPA) and Air Force Research Laboratory, Air Force
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* Materiel Command, USAF, under agreement number F30602-01-2-0537.
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*
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*/
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#if defined(__FreeBSD__)
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#endif
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#if defined(__FreeBSD__) && __FreeBSD__ >= 5
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#include "opt_bpf.h"
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#define NBPFILTER DEV_BPF
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#include "opt_pf.h"
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#define NPFLOG DEV_PFLOG
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#define NPFSYNC DEV_PFSYNC
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#else
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#include "bpfilter.h"
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#include "pflog.h"
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#include "pfsync.h"
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/filio.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/kernel.h>
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#include <sys/time.h>
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#if defined(__FreeBSD__)
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#include <sys/sysctl.h>
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#else
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#include <sys/pool.h>
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#endif
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/bpf.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_var.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_seq.h>
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#include <netinet/udp.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/in_pcb.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/udp_var.h>
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#include <netinet/icmp_var.h>
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#if !defined(__FreeBSD__)
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#include <dev/rndvar.h>
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#endif
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#include <net/pfvar.h>
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#include <net/if_pflog.h>
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#include <net/if_pfsync.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet/in_pcb.h>
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#include <netinet/icmp6.h>
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#include <netinet6/nd6.h>
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#if defined(__FreeBSD__)
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_pcb.h>
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#endif
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#endif /* INET6 */
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#ifdef ALTQ
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#include <altq/if_altq.h>
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#endif
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#if defined(__FreeBSD__)
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#include <machine/in_cksum.h>
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#if (__FreeBSD_version >= 500112)
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#include <sys/limits.h>
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#else
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#include <machine/limits.h>
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#endif
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#include <sys/ucred.h>
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#endif
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#if defined(__FreeBSD__)
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extern int ip_optcopy(struct ip *, struct ip *);
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#if (__FreeBSD_version < 501105)
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int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
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u_long if_hwassist_flags, int sw_csum);
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#endif
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#endif
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#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x
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struct pf_state_tree;
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/*
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* Global variables
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*/
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struct pf_anchorqueue pf_anchors;
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struct pf_ruleset pf_main_ruleset;
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struct pf_altqqueue pf_altqs[2];
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struct pf_palist pf_pabuf;
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struct pf_altqqueue *pf_altqs_active;
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struct pf_altqqueue *pf_altqs_inactive;
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struct pf_status pf_status;
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struct ifnet *status_ifp;
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u_int32_t ticket_altqs_active;
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u_int32_t ticket_altqs_inactive;
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u_int32_t ticket_pabuf;
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#if defined(__FreeBSD__)
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struct callout pf_expire_to; /* expire timeout */
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#else
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struct timeout pf_expire_to; /* expire timeout */
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#endif
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#if defined(__FreeBSD__)
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uma_zone_t pf_tree_pl, pf_rule_pl, pf_addr_pl;
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uma_zone_t pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
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#else
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struct pool pf_tree_pl, pf_rule_pl, pf_addr_pl;
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struct pool pf_state_pl, pf_altq_pl, pf_pooladdr_pl;
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#endif
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void pf_dynaddr_update(void *);
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#if defined(__FreeBSD__) && defined(HOOK_HACK)
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void pf_dynaddr_update_event(void *arg, struct ifnet *ifp);
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#endif
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void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
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void pf_print_state(struct pf_state *);
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void pf_print_flags(u_int8_t);
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u_int16_t pf_cksum_fixup(u_int16_t, u_int16_t, u_int16_t,
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u_int8_t);
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void pf_change_ap(struct pf_addr *, u_int16_t *,
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u_int16_t *, u_int16_t *, struct pf_addr *,
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u_int16_t, u_int8_t, sa_family_t);
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#ifdef INET6
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void pf_change_a6(struct pf_addr *, u_int16_t *,
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struct pf_addr *, u_int8_t);
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#endif /* INET6 */
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void pf_change_icmp(struct pf_addr *, u_int16_t *,
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struct pf_addr *, struct pf_addr *, u_int16_t,
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u_int16_t *, u_int16_t *, u_int16_t *,
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u_int16_t *, u_int8_t, sa_family_t);
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void pf_send_tcp(const struct pf_rule *, sa_family_t,
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const struct pf_addr *, const struct pf_addr *,
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u_int16_t, u_int16_t, u_int32_t, u_int32_t,
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u_int8_t, u_int16_t, u_int16_t, u_int8_t);
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void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
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sa_family_t, struct pf_rule *);
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struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
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int, int, struct ifnet *,
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struct pf_addr *, u_int16_t, struct pf_addr *,
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u_int16_t, int);
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struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *,
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int, int, struct ifnet *,
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struct pf_addr *, u_int16_t,
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struct pf_addr *, u_int16_t,
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struct pf_addr *, u_int16_t *);
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int pf_test_tcp(struct pf_rule **, struct pf_state **,
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int, struct ifnet *, struct mbuf *, int, int,
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void *, struct pf_pdesc *, struct pf_rule **,
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struct pf_ruleset **);
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int pf_test_udp(struct pf_rule **, struct pf_state **,
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int, struct ifnet *, struct mbuf *, int, int,
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void *, struct pf_pdesc *, struct pf_rule **,
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struct pf_ruleset **);
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int pf_test_icmp(struct pf_rule **, struct pf_state **,
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int, struct ifnet *, struct mbuf *, int, int,
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void *, struct pf_pdesc *, struct pf_rule **,
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struct pf_ruleset **);
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int pf_test_other(struct pf_rule **, struct pf_state **,
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int, struct ifnet *, struct mbuf *, int, void *,
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struct pf_pdesc *, struct pf_rule **,
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struct pf_ruleset **);
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int pf_test_fragment(struct pf_rule **, int,
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struct ifnet *, struct mbuf *, void *,
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struct pf_pdesc *, struct pf_rule **,
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struct pf_ruleset **);
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int pf_test_state_tcp(struct pf_state **, int,
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struct ifnet *, struct mbuf *, int, int,
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void *, struct pf_pdesc *, u_short *);
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int pf_test_state_udp(struct pf_state **, int,
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struct ifnet *, struct mbuf *, int, int,
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void *, struct pf_pdesc *);
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int pf_test_state_icmp(struct pf_state **, int,
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struct ifnet *, struct mbuf *, int, int,
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void *, struct pf_pdesc *);
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int pf_test_state_other(struct pf_state **, int,
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struct ifnet *, struct pf_pdesc *);
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struct pf_tag *pf_get_tag(struct mbuf *);
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int pf_match_tag(struct mbuf *, struct pf_rule *,
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struct pf_rule *, struct pf_rule *,
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struct pf_tag *, int *);
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void pf_hash(struct pf_addr *, struct pf_addr *,
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struct pf_poolhashkey *, sa_family_t);
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int pf_map_addr(u_int8_t, struct pf_pool *,
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struct pf_addr *, struct pf_addr *,
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struct pf_addr *);
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int pf_get_sport(sa_family_t, u_int8_t, struct pf_pool *,
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struct pf_addr *, struct pf_addr *, u_int16_t,
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struct pf_addr *, u_int16_t*, u_int16_t, u_int16_t);
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void pf_route(struct mbuf **, struct pf_rule *, int,
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struct ifnet *, struct pf_state *);
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void pf_route6(struct mbuf **, struct pf_rule *, int,
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struct ifnet *, struct pf_state *);
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int pf_socket_lookup(uid_t *, gid_t *, int, sa_family_t,
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int, struct pf_pdesc *);
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u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t,
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sa_family_t);
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u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t,
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sa_family_t);
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u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t,
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u_int16_t);
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void pf_set_rt_ifp(struct pf_state *,
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struct pf_addr *);
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int pf_check_proto_cksum(struct mbuf *, int, int,
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u_int8_t, sa_family_t);
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int pf_addr_wrap_neq(struct pf_addr_wrap *,
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struct pf_addr_wrap *);
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#if defined(__FreeBSD__)
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int in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len);
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#endif
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#if defined(__FreeBSD__)
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struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX];
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#else
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struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] =
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{ { &pf_state_pl, PFSTATE_HIWAT }, { &pf_frent_pl, PFFRAG_FRENT_HIWAT } };
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#endif
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#define STATE_LOOKUP() \
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do { \
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if (direction == PF_IN) \
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*state = pf_find_state(&tree_ext_gwy, &key); \
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else \
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*state = pf_find_state(&tree_lan_ext, &key); \
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if (*state == NULL) \
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return (PF_DROP); \
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if (direction == PF_OUT && \
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(((*state)->rule.ptr->rt == PF_ROUTETO && \
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(*state)->rule.ptr->direction == PF_OUT) || \
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((*state)->rule.ptr->rt == PF_REPLYTO && \
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(*state)->rule.ptr->direction == PF_IN)) && \
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(*state)->rt_ifp != NULL && \
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(*state)->rt_ifp != ifp) \
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return (PF_PASS); \
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} while (0)
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#define STATE_TRANSLATE(s) \
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(s)->lan.addr.addr32[0] != (s)->gwy.addr.addr32[0] || \
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((s)->af == AF_INET6 && \
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((s)->lan.addr.addr32[1] != (s)->gwy.addr.addr32[1] || \
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(s)->lan.addr.addr32[2] != (s)->gwy.addr.addr32[2] || \
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(s)->lan.addr.addr32[3] != (s)->gwy.addr.addr32[3])) || \
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(s)->lan.port != (s)->gwy.port
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static __inline int pf_state_compare(struct pf_tree_node *,
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struct pf_tree_node *);
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struct pf_state_tree tree_lan_ext, tree_ext_gwy;
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RB_GENERATE(pf_state_tree, pf_tree_node, entry, pf_state_compare);
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static __inline int
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pf_state_compare(struct pf_tree_node *a, struct pf_tree_node *b)
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{
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int diff;
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if ((diff = a->proto - b->proto) != 0)
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return (diff);
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if ((diff = a->af - b->af) != 0)
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return (diff);
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switch (a->af) {
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#ifdef INET
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case AF_INET:
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if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
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return (1);
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if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
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return (-1);
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if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
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return (1);
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if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
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return (-1);
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break;
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#endif /* INET */
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#ifdef INET6
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case AF_INET6:
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if (a->addr[0].addr32[3] > b->addr[0].addr32[3])
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return (1);
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if (a->addr[0].addr32[3] < b->addr[0].addr32[3])
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return (-1);
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if (a->addr[1].addr32[3] > b->addr[1].addr32[3])
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return (1);
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if (a->addr[1].addr32[3] < b->addr[1].addr32[3])
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return (-1);
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if (a->addr[0].addr32[2] > b->addr[0].addr32[2])
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return (1);
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if (a->addr[0].addr32[2] < b->addr[0].addr32[2])
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return (-1);
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if (a->addr[1].addr32[2] > b->addr[1].addr32[2])
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return (1);
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if (a->addr[1].addr32[2] < b->addr[1].addr32[2])
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return (-1);
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if (a->addr[0].addr32[1] > b->addr[0].addr32[1])
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return (1);
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if (a->addr[0].addr32[1] < b->addr[0].addr32[1])
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return (-1);
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if (a->addr[1].addr32[1] > b->addr[1].addr32[1])
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return (1);
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if (a->addr[1].addr32[1] < b->addr[1].addr32[1])
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return (-1);
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if (a->addr[0].addr32[0] > b->addr[0].addr32[0])
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return (1);
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if (a->addr[0].addr32[0] < b->addr[0].addr32[0])
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return (-1);
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if (a->addr[1].addr32[0] > b->addr[1].addr32[0])
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return (1);
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if (a->addr[1].addr32[0] < b->addr[1].addr32[0])
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return (-1);
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break;
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#endif /* INET6 */
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}
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if ((diff = a->port[0] - b->port[0]) != 0)
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return (diff);
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if ((diff = a->port[1] - b->port[1]) != 0)
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return (diff);
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return (0);
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}
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#ifdef INET6
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void
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pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
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{
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switch (af) {
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#ifdef INET
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case AF_INET:
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dst->addr32[0] = src->addr32[0];
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break;
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#endif /* INET */
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case AF_INET6:
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dst->addr32[0] = src->addr32[0];
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dst->addr32[1] = src->addr32[1];
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dst->addr32[2] = src->addr32[2];
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dst->addr32[3] = src->addr32[3];
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break;
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}
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}
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#endif
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struct pf_state *
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pf_find_state(struct pf_state_tree *tree, struct pf_tree_node *key)
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{
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struct pf_tree_node *k;
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pf_status.fcounters[FCNT_STATE_SEARCH]++;
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k = RB_FIND(pf_state_tree, tree, key);
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if (k)
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return (k->state);
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else
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return (NULL);
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}
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int
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pf_insert_state(struct pf_state *state)
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{
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struct pf_tree_node *keya, *keyb;
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keya = pool_get(&pf_tree_pl, PR_NOWAIT);
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if (keya == NULL)
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return (-1);
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keya->state = state;
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keya->proto = state->proto;
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keya->af = state->af;
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PF_ACPY(&keya->addr[0], &state->lan.addr, state->af);
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keya->port[0] = state->lan.port;
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PF_ACPY(&keya->addr[1], &state->ext.addr, state->af);
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keya->port[1] = state->ext.port;
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/* Thou MUST NOT insert multiple duplicate keys */
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if (RB_INSERT(pf_state_tree, &tree_lan_ext, keya) != NULL) {
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if (pf_status.debug >= PF_DEBUG_MISC) {
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printf("pf: state insert failed: tree_lan_ext");
|
|
printf(" lan: ");
|
|
pf_print_host(&state->lan.addr, state->lan.port,
|
|
state->af);
|
|
printf(" gwy: ");
|
|
pf_print_host(&state->gwy.addr, state->gwy.port,
|
|
state->af);
|
|
printf(" ext: ");
|
|
pf_print_host(&state->ext.addr, state->ext.port,
|
|
state->af);
|
|
printf("\n");
|
|
}
|
|
pool_put(&pf_tree_pl, keya);
|
|
return (-1);
|
|
}
|
|
|
|
keyb = pool_get(&pf_tree_pl, PR_NOWAIT);
|
|
if (keyb == NULL) {
|
|
/* Need to pull out the other state */
|
|
RB_REMOVE(pf_state_tree, &tree_lan_ext, keya);
|
|
pool_put(&pf_tree_pl, keya);
|
|
return (-1);
|
|
}
|
|
keyb->state = state;
|
|
keyb->proto = state->proto;
|
|
keyb->af = state->af;
|
|
PF_ACPY(&keyb->addr[0], &state->ext.addr, state->af);
|
|
keyb->port[0] = state->ext.port;
|
|
PF_ACPY(&keyb->addr[1], &state->gwy.addr, state->af);
|
|
keyb->port[1] = state->gwy.port;
|
|
|
|
if (RB_INSERT(pf_state_tree, &tree_ext_gwy, keyb) != NULL) {
|
|
if (pf_status.debug >= PF_DEBUG_MISC) {
|
|
printf("pf: state insert failed: tree_ext_gwy");
|
|
printf(" lan: ");
|
|
pf_print_host(&state->lan.addr, state->lan.port,
|
|
state->af);
|
|
printf(" gwy: ");
|
|
pf_print_host(&state->gwy.addr, state->gwy.port,
|
|
state->af);
|
|
printf(" ext: ");
|
|
pf_print_host(&state->ext.addr, state->ext.port,
|
|
state->af);
|
|
printf("\n");
|
|
}
|
|
RB_REMOVE(pf_state_tree, &tree_lan_ext, keya);
|
|
pool_put(&pf_tree_pl, keya);
|
|
pool_put(&pf_tree_pl, keyb);
|
|
return (-1);
|
|
}
|
|
|
|
pf_status.fcounters[FCNT_STATE_INSERT]++;
|
|
pf_status.states++;
|
|
#if NPFSYNC
|
|
pfsync_insert_state(state);
|
|
#endif
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
pf_purge_timeout(void *arg)
|
|
{
|
|
#if defined(__FreeBSD__)
|
|
struct callout *to = arg;
|
|
#else
|
|
struct timeout *to = arg;
|
|
#endif
|
|
int s;
|
|
|
|
#if defined(__FreeBSD__)
|
|
PF_LOCK();
|
|
#endif
|
|
s = splsoftnet();
|
|
pf_purge_expired_states();
|
|
pf_purge_expired_fragments();
|
|
splx(s);
|
|
#if defined(__FreeBSD__)
|
|
PF_UNLOCK();
|
|
#endif
|
|
|
|
#if defined(__FreeBSD__)
|
|
callout_reset(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz,
|
|
pf_purge_timeout, to);
|
|
#else
|
|
timeout_add(to, pf_default_rule.timeout[PFTM_INTERVAL] * hz);
|
|
#endif
|
|
}
|
|
|
|
u_int32_t
|
|
pf_state_expires(const struct pf_state *state)
|
|
{
|
|
u_int32_t timeout;
|
|
u_int32_t start;
|
|
u_int32_t end;
|
|
u_int32_t states;
|
|
|
|
/* handle all PFTM_* > PFTM_MAX here */
|
|
if (state->timeout == PFTM_PURGE)
|
|
#if defined(__FreeBSD__)
|
|
return (time_second);
|
|
#else
|
|
return (time.tv_sec);
|
|
#endif
|
|
if (state->timeout == PFTM_UNTIL_PACKET)
|
|
return (0);
|
|
#if defined(__FreeBSD__)
|
|
KASSERT((state->timeout < PFTM_MAX),
|
|
("pf_state_expires: timeout > PFTM_MAX"));
|
|
#else
|
|
KASSERT(state->timeout < PFTM_MAX);
|
|
#endif
|
|
timeout = state->rule.ptr->timeout[state->timeout];
|
|
if (!timeout)
|
|
timeout = pf_default_rule.timeout[state->timeout];
|
|
start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
|
|
if (start) {
|
|
end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
|
|
states = state->rule.ptr->states;
|
|
} else {
|
|
start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
|
|
end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
|
|
states = pf_status.states;
|
|
}
|
|
if (end && states > start && start < end) {
|
|
if (states < end)
|
|
return (state->expire + timeout * (end - states) /
|
|
(end - start));
|
|
else
|
|
#if defined(__FreeBSD__)
|
|
return (time_second);
|
|
#else
|
|
return (time.tv_sec);
|
|
#endif
|
|
}
|
|
return (state->expire + timeout);
|
|
}
|
|
|
|
void
|
|
pf_purge_expired_states(void)
|
|
{
|
|
struct pf_tree_node *cur, *peer, *next;
|
|
struct pf_tree_node key;
|
|
|
|
for (cur = RB_MIN(pf_state_tree, &tree_ext_gwy); cur; cur = next) {
|
|
next = RB_NEXT(pf_state_tree, &tree_ext_gwy, cur);
|
|
|
|
#if defined(__FreeBSD__)
|
|
if (pf_state_expires(cur->state) <= (u_int32_t)time_second) {
|
|
#else
|
|
if (pf_state_expires(cur->state) <= time.tv_sec) {
|
|
#endif
|
|
if (cur->state->src.state == PF_TCPS_PROXY_DST)
|
|
pf_send_tcp(cur->state->rule.ptr,
|
|
cur->state->af,
|
|
&cur->state->ext.addr,
|
|
&cur->state->lan.addr,
|
|
cur->state->ext.port,
|
|
cur->state->lan.port,
|
|
cur->state->src.seqhi,
|
|
cur->state->src.seqlo + 1,
|
|
0,
|
|
TH_RST|TH_ACK, 0, 0);
|
|
RB_REMOVE(pf_state_tree, &tree_ext_gwy, cur);
|
|
|
|
/* Need this key's peer (in the other tree) */
|
|
key.state = cur->state;
|
|
key.proto = cur->state->proto;
|
|
key.af = cur->state->af;
|
|
PF_ACPY(&key.addr[0], &cur->state->lan.addr,
|
|
cur->state->af);
|
|
key.port[0] = cur->state->lan.port;
|
|
PF_ACPY(&key.addr[1], &cur->state->ext.addr,
|
|
cur->state->af);
|
|
key.port[1] = cur->state->ext.port;
|
|
|
|
peer = RB_FIND(pf_state_tree, &tree_lan_ext, &key);
|
|
#if defined(__FreeBSD__)
|
|
KASSERT((peer), ("peer null :%s", __FUNCTION__));
|
|
KASSERT((peer->state == cur->state),
|
|
("peer->state != cur->state: %s", __FUNCTION__));
|
|
#else
|
|
KASSERT(peer);
|
|
KASSERT(peer->state == cur->state);
|
|
#endif
|
|
RB_REMOVE(pf_state_tree, &tree_lan_ext, peer);
|
|
|
|
#if NPFSYNC
|
|
pfsync_delete_state(cur->state);
|
|
#endif
|
|
if (--cur->state->rule.ptr->states <= 0)
|
|
pf_rm_rule(NULL, cur->state->rule.ptr);
|
|
if (cur->state->nat_rule.ptr != NULL)
|
|
if (--cur->state->nat_rule.ptr->states <= 0)
|
|
pf_rm_rule(NULL,
|
|
cur->state->nat_rule.ptr);
|
|
if (cur->state->anchor.ptr != NULL)
|
|
if (--cur->state->anchor.ptr->states <= 0)
|
|
pf_rm_rule(NULL,
|
|
cur->state->anchor.ptr);
|
|
pf_normalize_tcp_cleanup(cur->state);
|
|
pool_put(&pf_state_pl, cur->state);
|
|
pool_put(&pf_tree_pl, cur);
|
|
pool_put(&pf_tree_pl, peer);
|
|
pf_status.fcounters[FCNT_STATE_REMOVALS]++;
|
|
pf_status.states--;
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
|
|
{
|
|
if (aw->type != PF_ADDR_TABLE)
|
|
return (0);
|
|
if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
pf_tbladdr_remove(struct pf_addr_wrap *aw)
|
|
{
|
|
if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
|
|
return;
|
|
pfr_detach_table(aw->p.tbl);
|
|
aw->p.tbl = NULL;
|
|
}
|
|
|
|
void
|
|
pf_tbladdr_copyout(struct pf_addr_wrap *aw)
|
|
{
|
|
struct pfr_ktable *kt = aw->p.tbl;
|
|
|
|
if (aw->type != PF_ADDR_TABLE || kt == NULL)
|
|
return;
|
|
if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
|
|
kt = kt->pfrkt_root;
|
|
aw->p.tbl = NULL;
|
|
aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
|
|
kt->pfrkt_cnt : -1;
|
|
}
|
|
|
|
int
|
|
pf_dynaddr_setup(struct pf_addr_wrap *aw, sa_family_t af)
|
|
{
|
|
if (aw->type != PF_ADDR_DYNIFTL)
|
|
return (0);
|
|
aw->p.dyn = pool_get(&pf_addr_pl, PR_NOWAIT);
|
|
if (aw->p.dyn == NULL)
|
|
return (1);
|
|
bcopy(aw->v.ifname, aw->p.dyn->ifname, sizeof(aw->p.dyn->ifname));
|
|
aw->p.dyn->ifp = ifunit(aw->p.dyn->ifname);
|
|
if (aw->p.dyn->ifp == NULL) {
|
|
pool_put(&pf_addr_pl, aw->p.dyn);
|
|
aw->p.dyn = NULL;
|
|
return (1);
|
|
}
|
|
aw->p.dyn->addr = &aw->v.a.addr;
|
|
aw->p.dyn->af = af;
|
|
aw->p.dyn->undefined = 1;
|
|
#if !defined(__FreeBSD__)
|
|
aw->p.dyn->hook_cookie = hook_establish(
|
|
aw->p.dyn->ifp->if_addrhooks, 1,
|
|
pf_dynaddr_update, aw->p.dyn);
|
|
if (aw->p.dyn->hook_cookie == NULL) {
|
|
pool_put(&pf_addr_pl, aw->p.dyn);
|
|
aw->p.dyn = NULL;
|
|
return (1);
|
|
}
|
|
#elif defined(__FreeBSD__) && defined(HOOK_HACK)
|
|
PF_UNLOCK();
|
|
aw->p.dyn->hook_cookie = EVENTHANDLER_REGISTER(ifaddr_event,
|
|
pf_dynaddr_update_event, aw->p.dyn, EVENTHANDLER_PRI_ANY);
|
|
PF_LOCK();
|
|
if (aw->p.dyn->hook_cookie == NULL) {
|
|
pool_put(&pf_addr_pl, aw->p.dyn);
|
|
aw->p.dyn = NULL;
|
|
return (1);
|
|
}
|
|
#else
|
|
/*
|
|
* XXX
|
|
* We have no hook_establish(9)/dohooks(9) kernel interfaces.
|
|
* This means that we do not aware of interface address changes(add,
|
|
* remove, etc). User should update pf rule manually after interface
|
|
* address changed. This may not be possible solution if you use xDSL.
|
|
* ipfw/ipfw2's approach with this situation(with me keyword) is not
|
|
* very efficient due to analyzing interface address during runtime.
|
|
* Another solution is to use a user-land daemon watching address
|
|
* changes with socket interface. Neither one is good.
|
|
* Supporting hook_establish(9) requries modification of in_control()
|
|
* located in netinet/in.c.
|
|
*/
|
|
#endif
|
|
pf_dynaddr_update(aw->p.dyn);
|
|
return (0);
|
|
}
|
|
|
|
#if defined(__FreeBSD__) && defined(HOOK_HACK)
|
|
void
|
|
pf_dynaddr_update_event(void *arg, struct ifnet *ifp)
|
|
{
|
|
PF_LOCK();
|
|
pf_dynaddr_update(arg);
|
|
PF_UNLOCK();
|
|
}
|
|
#endif
|
|
|
|
void
|
|
pf_dynaddr_update(void *p)
|
|
{
|
|
struct pf_addr_dyn *ad = (struct pf_addr_dyn *)p;
|
|
struct ifaddr *ia;
|
|
int s, changed = 0;
|
|
|
|
if (ad == NULL || ad->ifp == NULL)
|
|
panic("pf_dynaddr_update");
|
|
s = splsoftnet();
|
|
TAILQ_FOREACH(ia, &ad->ifp->if_addrlist, ifa_list)
|
|
if (ia->ifa_addr != NULL &&
|
|
ia->ifa_addr->sa_family == ad->af) {
|
|
if (ad->af == AF_INET) {
|
|
struct in_addr *a, *b;
|
|
|
|
a = &ad->addr->v4;
|
|
b = &((struct sockaddr_in *)ia->ifa_addr)
|
|
->sin_addr;
|
|
if (ad->undefined ||
|
|
memcmp(a, b, sizeof(*a))) {
|
|
bcopy(b, a, sizeof(*a));
|
|
changed = 1;
|
|
}
|
|
} else if (ad->af == AF_INET6) {
|
|
struct in6_addr *a, *b;
|
|
|
|
a = &ad->addr->v6;
|
|
b = &((struct sockaddr_in6 *)ia->ifa_addr)
|
|
->sin6_addr;
|
|
if (ad->undefined ||
|
|
memcmp(a, b, sizeof(*a))) {
|
|
bcopy(b, a, sizeof(*a));
|
|
changed = 1;
|
|
}
|
|
}
|
|
if (changed)
|
|
ad->undefined = 0;
|
|
break;
|
|
}
|
|
if (ia == NULL)
|
|
ad->undefined = 1;
|
|
splx(s);
|
|
}
|
|
|
|
void
|
|
pf_dynaddr_remove(struct pf_addr_wrap *aw)
|
|
{
|
|
if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL)
|
|
return;
|
|
#if !defined(__FreeBSD__)
|
|
hook_disestablish(aw->p.dyn->ifp->if_addrhooks,
|
|
aw->p.dyn->hook_cookie);
|
|
#elif defined(__FreeBSD__) && defined(HOOK_HACK)
|
|
PF_UNLOCK();
|
|
EVENTHANDLER_DEREGISTER(ifaddr_event, aw->p.dyn->hook_cookie);
|
|
PF_LOCK();
|
|
#else
|
|
/*
|
|
* XXX
|
|
* We have no hook_establish(9)/dohooks(9) kernel interfaces.
|
|
* See comments above function, pf_dynaddr_setup().
|
|
*/
|
|
#endif
|
|
pool_put(&pf_addr_pl, aw->p.dyn);
|
|
aw->p.dyn = NULL;
|
|
}
|
|
|
|
void
|
|
pf_dynaddr_copyout(struct pf_addr_wrap *aw)
|
|
{
|
|
if (aw->type != PF_ADDR_DYNIFTL || aw->p.dyn == NULL)
|
|
return;
|
|
bcopy(aw->p.dyn->ifname, aw->v.ifname, sizeof(aw->v.ifname));
|
|
aw->p.dyn = (struct pf_addr_dyn *)1;
|
|
}
|
|
|
|
void
|
|
pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
|
|
{
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET: {
|
|
u_int32_t a = ntohl(addr->addr32[0]);
|
|
printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
|
|
(a>>8)&255, a&255);
|
|
if (p) {
|
|
p = ntohs(p);
|
|
printf(":%u", p);
|
|
}
|
|
break;
|
|
}
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6: {
|
|
u_int16_t b;
|
|
u_int8_t i, curstart = 255, curend = 0,
|
|
maxstart = 0, maxend = 0;
|
|
for (i = 0; i < 8; i++) {
|
|
if (!addr->addr16[i]) {
|
|
if (curstart == 255)
|
|
curstart = i;
|
|
else
|
|
curend = i;
|
|
} else {
|
|
if (curstart) {
|
|
if ((curend - curstart) >
|
|
(maxend - maxstart)) {
|
|
maxstart = curstart;
|
|
maxend = curend;
|
|
curstart = 255;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
for (i = 0; i < 8; i++) {
|
|
if (i >= maxstart && i <= maxend) {
|
|
if (maxend != 7) {
|
|
if (i == maxstart)
|
|
printf(":");
|
|
} else {
|
|
if (i == maxend)
|
|
printf(":");
|
|
}
|
|
} else {
|
|
b = ntohs(addr->addr16[i]);
|
|
printf("%x", b);
|
|
if (i < 7)
|
|
printf(":");
|
|
}
|
|
}
|
|
if (p) {
|
|
p = ntohs(p);
|
|
printf("[%u]", p);
|
|
}
|
|
break;
|
|
}
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_print_state(struct pf_state *s)
|
|
{
|
|
switch (s->proto) {
|
|
case IPPROTO_TCP:
|
|
printf("TCP ");
|
|
break;
|
|
case IPPROTO_UDP:
|
|
printf("UDP ");
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
printf("ICMP ");
|
|
break;
|
|
case IPPROTO_ICMPV6:
|
|
printf("ICMPV6 ");
|
|
break;
|
|
default:
|
|
printf("%u ", s->proto);
|
|
break;
|
|
}
|
|
pf_print_host(&s->lan.addr, s->lan.port, s->af);
|
|
printf(" ");
|
|
pf_print_host(&s->gwy.addr, s->gwy.port, s->af);
|
|
printf(" ");
|
|
pf_print_host(&s->ext.addr, s->ext.port, s->af);
|
|
printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
|
|
s->src.seqhi, s->src.max_win, s->src.seqdiff);
|
|
if (s->src.wscale && s->dst.wscale)
|
|
printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
|
|
printf("]");
|
|
printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
|
|
s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
|
|
if (s->src.wscale && s->dst.wscale)
|
|
printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
|
|
printf("]");
|
|
printf(" %u:%u", s->src.state, s->dst.state);
|
|
}
|
|
|
|
void
|
|
pf_print_flags(u_int8_t f)
|
|
{
|
|
if (f)
|
|
printf(" ");
|
|
if (f & TH_FIN)
|
|
printf("F");
|
|
if (f & TH_SYN)
|
|
printf("S");
|
|
if (f & TH_RST)
|
|
printf("R");
|
|
if (f & TH_PUSH)
|
|
printf("P");
|
|
if (f & TH_ACK)
|
|
printf("A");
|
|
if (f & TH_URG)
|
|
printf("U");
|
|
if (f & TH_ECE)
|
|
printf("E");
|
|
if (f & TH_CWR)
|
|
printf("W");
|
|
}
|
|
|
|
#define PF_SET_SKIP_STEPS(i) \
|
|
do { \
|
|
while (head[i] != cur) { \
|
|
head[i]->skip[i].ptr = cur; \
|
|
head[i] = TAILQ_NEXT(head[i], entries); \
|
|
} \
|
|
} while (0)
|
|
|
|
void
|
|
pf_calc_skip_steps(struct pf_rulequeue *rules)
|
|
{
|
|
struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
|
|
int i;
|
|
|
|
cur = TAILQ_FIRST(rules);
|
|
prev = cur;
|
|
for (i = 0; i < PF_SKIP_COUNT; ++i)
|
|
head[i] = cur;
|
|
while (cur != NULL) {
|
|
|
|
if (cur->ifp != prev->ifp || cur->ifnot != prev->ifnot)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_IFP);
|
|
if (cur->direction != prev->direction)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_DIR);
|
|
if (cur->af != prev->af)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_AF);
|
|
if (cur->proto != prev->proto)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
|
|
if (cur->src.not != prev->src.not ||
|
|
pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
|
|
PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
|
|
if (cur->src.port[0] != prev->src.port[0] ||
|
|
cur->src.port[1] != prev->src.port[1] ||
|
|
cur->src.port_op != prev->src.port_op)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
|
|
if (cur->dst.not != prev->dst.not ||
|
|
pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
|
|
PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
|
|
if (cur->dst.port[0] != prev->dst.port[0] ||
|
|
cur->dst.port[1] != prev->dst.port[1] ||
|
|
cur->dst.port_op != prev->dst.port_op)
|
|
PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
|
|
|
|
prev = cur;
|
|
cur = TAILQ_NEXT(cur, entries);
|
|
}
|
|
for (i = 0; i < PF_SKIP_COUNT; ++i)
|
|
PF_SET_SKIP_STEPS(i);
|
|
}
|
|
|
|
int
|
|
pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
|
|
{
|
|
if (aw1->type != aw2->type)
|
|
return (1);
|
|
switch (aw1->type) {
|
|
case PF_ADDR_ADDRMASK:
|
|
if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
|
|
return (1);
|
|
if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
|
|
return (1);
|
|
return (0);
|
|
case PF_ADDR_DYNIFTL:
|
|
if (aw1->p.dyn->ifp != aw2->p.dyn->ifp)
|
|
return (1);
|
|
if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
|
|
return (1);
|
|
return (0);
|
|
case PF_ADDR_NOROUTE:
|
|
return (0);
|
|
case PF_ADDR_TABLE:
|
|
return (aw1->p.tbl != aw2->p.tbl);
|
|
default:
|
|
printf("invalid address type: %d\n", aw1->type);
|
|
return (1);
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_rule_set_qid(struct pf_rulequeue *rules)
|
|
{
|
|
struct pf_rule *rule;
|
|
|
|
TAILQ_FOREACH(rule, rules, entries)
|
|
if (rule->qname[0] != 0) {
|
|
rule->qid = pf_qname_to_qid(rule->qname);
|
|
if (rule->pqname[0] != 0)
|
|
rule->pqid = pf_qname_to_qid(rule->pqname);
|
|
else
|
|
rule->pqid = rule->qid;
|
|
}
|
|
}
|
|
|
|
u_int32_t
|
|
pf_qname_to_qid(char *qname)
|
|
{
|
|
struct pf_altq *altq;
|
|
|
|
TAILQ_FOREACH(altq, pf_altqs_active, entries)
|
|
if (!strcmp(altq->qname, qname))
|
|
return (altq->qid);
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
pf_update_anchor_rules()
|
|
{
|
|
struct pf_rule *rule;
|
|
int i;
|
|
|
|
for (i = 0; i < PF_RULESET_MAX; ++i)
|
|
TAILQ_FOREACH(rule, pf_main_ruleset.rules[i].active.ptr,
|
|
entries)
|
|
if (rule->anchorname[0])
|
|
rule->anchor = pf_find_anchor(rule->anchorname);
|
|
else
|
|
rule->anchor = NULL;
|
|
}
|
|
|
|
u_int16_t
|
|
pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
|
|
{
|
|
u_int32_t l;
|
|
|
|
if (udp && !cksum)
|
|
return (0x0000);
|
|
l = cksum + old - new;
|
|
l = (l >> 16) + (l & 65535);
|
|
l = l & 65535;
|
|
if (udp && !l)
|
|
return (0xFFFF);
|
|
return (l);
|
|
}
|
|
|
|
void
|
|
pf_change_ap(struct pf_addr *a, u_int16_t *p, u_int16_t *ic, u_int16_t *pc,
|
|
struct pf_addr *an, u_int16_t pn, u_int8_t u, sa_family_t af)
|
|
{
|
|
struct pf_addr ao;
|
|
u_int16_t po = *p;
|
|
|
|
PF_ACPY(&ao, a, af);
|
|
PF_ACPY(a, an, af);
|
|
|
|
*p = pn;
|
|
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
*ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
|
|
ao.addr16[0], an->addr16[0], 0),
|
|
ao.addr16[1], an->addr16[1], 0);
|
|
*p = pn;
|
|
*pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
|
|
ao.addr16[0], an->addr16[0], u),
|
|
ao.addr16[1], an->addr16[1], u),
|
|
po, pn, u);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
*pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
|
|
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
|
|
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
|
|
ao.addr16[0], an->addr16[0], u),
|
|
ao.addr16[1], an->addr16[1], u),
|
|
ao.addr16[2], an->addr16[2], u),
|
|
ao.addr16[3], an->addr16[3], u),
|
|
ao.addr16[4], an->addr16[4], u),
|
|
ao.addr16[5], an->addr16[5], u),
|
|
ao.addr16[6], an->addr16[6], u),
|
|
ao.addr16[7], an->addr16[7], u),
|
|
po, pn, u);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
|
|
/* Changes a u_int32_t. Uses a void * so there are no align restrictions */
|
|
void
|
|
pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
|
|
{
|
|
u_int32_t ao;
|
|
|
|
memcpy(&ao, a, sizeof(ao));
|
|
memcpy(a, &an, sizeof(u_int32_t));
|
|
*c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
|
|
ao % 65536, an % 65536, u);
|
|
}
|
|
|
|
#ifdef INET6
|
|
void
|
|
pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
|
|
{
|
|
struct pf_addr ao;
|
|
|
|
PF_ACPY(&ao, a, AF_INET6);
|
|
PF_ACPY(a, an, AF_INET6);
|
|
|
|
*c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
|
|
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
|
|
pf_cksum_fixup(pf_cksum_fixup(*c,
|
|
ao.addr16[0], an->addr16[0], u),
|
|
ao.addr16[1], an->addr16[1], u),
|
|
ao.addr16[2], an->addr16[2], u),
|
|
ao.addr16[3], an->addr16[3], u),
|
|
ao.addr16[4], an->addr16[4], u),
|
|
ao.addr16[5], an->addr16[5], u),
|
|
ao.addr16[6], an->addr16[6], u),
|
|
ao.addr16[7], an->addr16[7], u);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
void
|
|
pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
|
|
struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
|
|
u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
|
|
{
|
|
struct pf_addr oia, ooa;
|
|
|
|
PF_ACPY(&oia, ia, af);
|
|
PF_ACPY(&ooa, oa, af);
|
|
|
|
/* Change inner protocol port, fix inner protocol checksum. */
|
|
if (ip != NULL) {
|
|
u_int16_t oip = *ip;
|
|
u_int32_t opc;
|
|
|
|
if (pc != NULL)
|
|
opc = *pc;
|
|
*ip = np;
|
|
if (pc != NULL)
|
|
*pc = pf_cksum_fixup(*pc, oip, *ip, u);
|
|
*ic = pf_cksum_fixup(*ic, oip, *ip, 0);
|
|
if (pc != NULL)
|
|
*ic = pf_cksum_fixup(*ic, opc, *pc, 0);
|
|
}
|
|
/* Change inner ip address, fix inner ip and icmp checksums. */
|
|
PF_ACPY(ia, na, af);
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET: {
|
|
u_int32_t oh2c = *h2c;
|
|
|
|
*h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
|
|
oia.addr16[0], ia->addr16[0], 0),
|
|
oia.addr16[1], ia->addr16[1], 0);
|
|
*ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
|
|
oia.addr16[0], ia->addr16[0], 0),
|
|
oia.addr16[1], ia->addr16[1], 0);
|
|
*ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
|
|
break;
|
|
}
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
*ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
|
|
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
|
|
pf_cksum_fixup(pf_cksum_fixup(*ic,
|
|
oia.addr16[0], ia->addr16[0], u),
|
|
oia.addr16[1], ia->addr16[1], u),
|
|
oia.addr16[2], ia->addr16[2], u),
|
|
oia.addr16[3], ia->addr16[3], u),
|
|
oia.addr16[4], ia->addr16[4], u),
|
|
oia.addr16[5], ia->addr16[5], u),
|
|
oia.addr16[6], ia->addr16[6], u),
|
|
oia.addr16[7], ia->addr16[7], u);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
/* Change outer ip address, fix outer ip or icmpv6 checksum. */
|
|
PF_ACPY(oa, na, af);
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
*hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
|
|
ooa.addr16[0], oa->addr16[0], 0),
|
|
ooa.addr16[1], oa->addr16[1], 0);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
*ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
|
|
pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
|
|
pf_cksum_fixup(pf_cksum_fixup(*ic,
|
|
ooa.addr16[0], oa->addr16[0], u),
|
|
ooa.addr16[1], oa->addr16[1], u),
|
|
ooa.addr16[2], oa->addr16[2], u),
|
|
ooa.addr16[3], oa->addr16[3], u),
|
|
ooa.addr16[4], oa->addr16[4], u),
|
|
ooa.addr16[5], oa->addr16[5], u),
|
|
ooa.addr16[6], oa->addr16[6], u),
|
|
ooa.addr16[7], oa->addr16[7], u);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_send_tcp(const struct pf_rule *r, sa_family_t af,
|
|
const struct pf_addr *saddr, const struct pf_addr *daddr,
|
|
u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
|
|
u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl)
|
|
{
|
|
struct mbuf *m;
|
|
struct m_tag *mtag;
|
|
int len, tlen;
|
|
#ifdef INET
|
|
struct ip *h;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
struct ip6_hdr *h6;
|
|
#endif /* INET6 */
|
|
struct tcphdr *th;
|
|
#if defined(__FreeBSD__)
|
|
struct ip *ip;
|
|
#if (__FreeBSD_version < 501114)
|
|
struct route ro;
|
|
#endif
|
|
#endif
|
|
char *opt;
|
|
|
|
/* maximum segment size tcp option */
|
|
tlen = sizeof(struct tcphdr);
|
|
if (mss)
|
|
tlen += 4;
|
|
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
len = sizeof(struct ip) + tlen;
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
len = sizeof(struct ip6_hdr) + tlen;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
/* create outgoing mbuf */
|
|
mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
|
|
if (mtag == NULL)
|
|
return;
|
|
m = m_gethdr(M_DONTWAIT, MT_HEADER);
|
|
if (m == NULL) {
|
|
m_tag_free(mtag);
|
|
return;
|
|
}
|
|
m_tag_prepend(m, mtag);
|
|
#ifdef ALTQ
|
|
if (r != NULL && r->qid) {
|
|
struct altq_tag *atag;
|
|
|
|
mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
|
|
if (mtag != NULL) {
|
|
atag = (struct altq_tag *)(mtag + 1);
|
|
atag->qid = r->qid;
|
|
/* add hints for ecn */
|
|
atag->af = af;
|
|
atag->hdr = mtod(m, struct ip *);
|
|
m_tag_prepend(m, mtag);
|
|
}
|
|
}
|
|
#endif
|
|
m->m_data += max_linkhdr;
|
|
m->m_pkthdr.len = m->m_len = len;
|
|
m->m_pkthdr.rcvif = NULL;
|
|
bzero(m->m_data, len);
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
h = mtod(m, struct ip *);
|
|
|
|
/* IP header fields included in the TCP checksum */
|
|
h->ip_p = IPPROTO_TCP;
|
|
h->ip_len = htons(tlen);
|
|
h->ip_src.s_addr = saddr->v4.s_addr;
|
|
h->ip_dst.s_addr = daddr->v4.s_addr;
|
|
|
|
th = (struct tcphdr *)((caddr_t)h + sizeof(struct ip));
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
h6 = mtod(m, struct ip6_hdr *);
|
|
|
|
/* IP header fields included in the TCP checksum */
|
|
h6->ip6_nxt = IPPROTO_TCP;
|
|
h6->ip6_plen = htons(tlen);
|
|
memcpy(&h6->ip6_src, &saddr->v6, sizeof(struct in6_addr));
|
|
memcpy(&h6->ip6_dst, &daddr->v6, sizeof(struct in6_addr));
|
|
|
|
th = (struct tcphdr *)((caddr_t)h6 + sizeof(struct ip6_hdr));
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
/* TCP header */
|
|
th->th_sport = sport;
|
|
th->th_dport = dport;
|
|
th->th_seq = htonl(seq);
|
|
th->th_ack = htonl(ack);
|
|
th->th_off = tlen >> 2;
|
|
th->th_flags = flags;
|
|
th->th_win = htons(win);
|
|
|
|
if (mss) {
|
|
opt = (char *)(th + 1);
|
|
opt[0] = TCPOPT_MAXSEG;
|
|
opt[1] = 4;
|
|
HTONS(mss);
|
|
bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
|
|
}
|
|
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
/* TCP checksum */
|
|
th->th_sum = in_cksum(m, len);
|
|
|
|
/* Finish the IP header */
|
|
h->ip_v = 4;
|
|
h->ip_hl = sizeof(*h) >> 2;
|
|
h->ip_tos = IPTOS_LOWDELAY;
|
|
#if defined(__FreeBSD__)
|
|
h->ip_off = htons(path_mtu_discovery ? IP_DF : 0);
|
|
#else
|
|
h->ip_off = htons(ip_mtudisc ? IP_DF : 0);
|
|
#endif
|
|
h->ip_len = htons(len);
|
|
h->ip_ttl = ttl ? ttl : ip_defttl;
|
|
h->ip_sum = 0;
|
|
#if defined(__FreeBSD__)
|
|
ip = mtod(m, struct ip *);
|
|
/*
|
|
* XXX
|
|
* OpenBSD changed ip_len/ip_off byte ordering!
|
|
* Because FreeBSD assumes host byte ordering we need to
|
|
* change here.
|
|
*/
|
|
NTOHS(ip->ip_len);
|
|
NTOHS(ip->ip_off);
|
|
#if (__FreeBSD_version < 501114)
|
|
bzero(&ro, sizeof(ro));
|
|
ip_rtaddr(ip->ip_dst, &ro);
|
|
PF_UNLOCK();
|
|
ip_output(m, (void *)NULL, &ro, 0, (void *)NULL,
|
|
(void *)NULL);
|
|
PF_LOCK();
|
|
if(ro.ro_rt) {
|
|
RTFREE(ro.ro_rt);
|
|
}
|
|
#else /* __FreeBSD_version >= 501114 */
|
|
PF_UNLOCK();
|
|
ip_output(m, (void *)NULL, (void *)NULL, 0, (void *)NULL,
|
|
(void *)NULL);
|
|
PF_LOCK();
|
|
#endif
|
|
#else /* ! __FreeBSD__ */
|
|
ip_output(m, (void *)NULL, (void *)NULL, 0, (void *)NULL,
|
|
(void *)NULL);
|
|
#endif
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
/* TCP checksum */
|
|
th->th_sum = in6_cksum(m, IPPROTO_TCP,
|
|
sizeof(struct ip6_hdr), tlen);
|
|
|
|
h6->ip6_vfc |= IPV6_VERSION;
|
|
h6->ip6_hlim = IPV6_DEFHLIM;
|
|
|
|
#if defined(__FreeBSD__)
|
|
PF_UNLOCK();
|
|
ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
|
|
PF_LOCK();
|
|
#else
|
|
ip6_output(m, NULL, NULL, 0, NULL, NULL);
|
|
#endif
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
|
|
struct pf_rule *r)
|
|
{
|
|
struct m_tag *mtag;
|
|
struct mbuf *m0;
|
|
#if defined(__FreeBSD__)
|
|
struct ip *ip;
|
|
#endif
|
|
|
|
mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
|
|
if (mtag == NULL)
|
|
return;
|
|
#if defined(__FreeBSD__)
|
|
m0 = m_copypacket(m, M_DONTWAIT);
|
|
#else
|
|
m0 = m_copy(m, 0, M_COPYALL);
|
|
#endif
|
|
if (m0 == NULL) {
|
|
m_tag_free(mtag);
|
|
return;
|
|
}
|
|
m_tag_prepend(m0, mtag);
|
|
|
|
#ifdef ALTQ
|
|
if (r->qid) {
|
|
struct altq_tag *atag;
|
|
|
|
mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
|
|
if (mtag != NULL) {
|
|
atag = (struct altq_tag *)(mtag + 1);
|
|
atag->qid = r->qid;
|
|
/* add hints for ecn */
|
|
atag->af = af;
|
|
atag->hdr = mtod(m0, struct ip *);
|
|
m_tag_prepend(m0, mtag);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
#if defined(__FreeBSD__)
|
|
/* icmp_error() expects host byte ordering */
|
|
ip = mtod(m0, struct ip *);
|
|
NTOHS(ip->ip_len);
|
|
NTOHS(ip->ip_off);
|
|
PF_UNLOCK();
|
|
#endif
|
|
icmp_error(m0, type, code, 0, NULL);
|
|
#if defined(__FreeBSD__)
|
|
PF_LOCK();
|
|
#endif
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
#if defined(__FreeBSD__)
|
|
PF_UNLOCK();
|
|
#endif
|
|
icmp6_error(m0, type, code, 0);
|
|
#if defined(__FreeBSD__)
|
|
PF_LOCK();
|
|
#endif
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Return 1 if the addresses a and b match (with mask m), otherwise return 0.
|
|
* If n is 0, they match if they are equal. If n is != 0, they match if they
|
|
* are different.
|
|
*/
|
|
int
|
|
pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
|
|
struct pf_addr *b, sa_family_t af)
|
|
{
|
|
int match = 0;
|
|
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
if ((a->addr32[0] & m->addr32[0]) ==
|
|
(b->addr32[0] & m->addr32[0]))
|
|
match++;
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (((a->addr32[0] & m->addr32[0]) ==
|
|
(b->addr32[0] & m->addr32[0])) &&
|
|
((a->addr32[1] & m->addr32[1]) ==
|
|
(b->addr32[1] & m->addr32[1])) &&
|
|
((a->addr32[2] & m->addr32[2]) ==
|
|
(b->addr32[2] & m->addr32[2])) &&
|
|
((a->addr32[3] & m->addr32[3]) ==
|
|
(b->addr32[3] & m->addr32[3])))
|
|
match++;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
if (match) {
|
|
if (n)
|
|
return (0);
|
|
else
|
|
return (1);
|
|
} else {
|
|
if (n)
|
|
return (1);
|
|
else
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
int
|
|
pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
|
|
{
|
|
switch (op) {
|
|
case PF_OP_IRG:
|
|
return ((p > a1) && (p < a2));
|
|
case PF_OP_XRG:
|
|
return ((p < a1) || (p > a2));
|
|
case PF_OP_RRG:
|
|
return ((p >= a1) && (p <= a2));
|
|
case PF_OP_EQ:
|
|
return (p == a1);
|
|
case PF_OP_NE:
|
|
return (p != a1);
|
|
case PF_OP_LT:
|
|
return (p < a1);
|
|
case PF_OP_LE:
|
|
return (p <= a1);
|
|
case PF_OP_GT:
|
|
return (p > a1);
|
|
case PF_OP_GE:
|
|
return (p >= a1);
|
|
}
|
|
return (0); /* never reached */
|
|
}
|
|
|
|
int
|
|
pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
|
|
{
|
|
NTOHS(a1);
|
|
NTOHS(a2);
|
|
NTOHS(p);
|
|
return (pf_match(op, a1, a2, p));
|
|
}
|
|
|
|
int
|
|
pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
|
|
{
|
|
if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
|
|
return (0);
|
|
return (pf_match(op, a1, a2, u));
|
|
}
|
|
|
|
int
|
|
pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
|
|
{
|
|
if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
|
|
return (0);
|
|
return (pf_match(op, a1, a2, g));
|
|
}
|
|
|
|
struct pf_tag *
|
|
pf_get_tag(struct mbuf *m)
|
|
{
|
|
struct m_tag *mtag;
|
|
|
|
if ((mtag = m_tag_find(m, PACKET_TAG_PF_TAG, NULL)) != NULL)
|
|
return ((struct pf_tag *)(mtag + 1));
|
|
else
|
|
return (NULL);
|
|
}
|
|
|
|
int
|
|
pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_rule *nat,
|
|
struct pf_rule *rdr, struct pf_tag *pftag, int *tag)
|
|
{
|
|
if (*tag == -1) { /* find mbuf tag */
|
|
pftag = pf_get_tag(m);
|
|
if (pftag != NULL)
|
|
*tag = pftag->tag;
|
|
else
|
|
*tag = 0;
|
|
if (nat != NULL && nat->tag)
|
|
*tag = nat->tag;
|
|
if (rdr != NULL && rdr->tag)
|
|
*tag = rdr->tag;
|
|
}
|
|
|
|
return ((!r->match_tag_not && r->match_tag == *tag) ||
|
|
(r->match_tag_not && r->match_tag != *tag));
|
|
}
|
|
|
|
int
|
|
pf_tag_packet(struct mbuf *m, struct pf_tag *pftag, int tag)
|
|
{
|
|
struct m_tag *mtag;
|
|
|
|
if (tag <= 0)
|
|
return (0);
|
|
|
|
if (pftag == NULL) {
|
|
mtag = m_tag_get(PACKET_TAG_PF_TAG, sizeof(*pftag), M_NOWAIT);
|
|
if (mtag == NULL)
|
|
return (1);
|
|
((struct pf_tag *)(mtag + 1))->tag = tag;
|
|
m_tag_prepend(m, mtag);
|
|
} else
|
|
pftag->tag = tag;
|
|
|
|
return (0);
|
|
}
|
|
|
|
#define PF_STEP_INTO_ANCHOR(r, a, s, n) \
|
|
do { \
|
|
if ((r) == NULL || (r)->anchor == NULL || \
|
|
(s) != NULL || (a) != NULL) \
|
|
panic("PF_STEP_INTO_ANCHOR"); \
|
|
(a) = (r); \
|
|
(s) = TAILQ_FIRST(&(r)->anchor->rulesets); \
|
|
(r) = NULL; \
|
|
while ((s) != NULL && ((r) = \
|
|
TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL) \
|
|
(s) = TAILQ_NEXT((s), entries); \
|
|
if ((r) == NULL) { \
|
|
(r) = TAILQ_NEXT((a), entries); \
|
|
(a) = NULL; \
|
|
} \
|
|
} while (0)
|
|
|
|
#define PF_STEP_OUT_OF_ANCHOR(r, a, s, n) \
|
|
do { \
|
|
if ((r) != NULL || (a) == NULL || (s) == NULL) \
|
|
panic("PF_STEP_OUT_OF_ANCHOR"); \
|
|
(s) = TAILQ_NEXT((s), entries); \
|
|
while ((s) != NULL && ((r) = \
|
|
TAILQ_FIRST((s)->rules[n].active.ptr)) == NULL) \
|
|
(s) = TAILQ_NEXT((s), entries); \
|
|
if ((r) == NULL) { \
|
|
(r) = TAILQ_NEXT((a), entries); \
|
|
(a) = NULL; \
|
|
} \
|
|
} while (0)
|
|
|
|
#ifdef INET6
|
|
void
|
|
pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
|
|
struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
|
|
{
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
|
|
((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
|
|
break;
|
|
#endif /* INET */
|
|
case AF_INET6:
|
|
naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
|
|
((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]);
|
|
naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
|
|
((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]);
|
|
naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
|
|
((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]);
|
|
naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
|
|
((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
pf_addr_inc(struct pf_addr *addr, u_int8_t af)
|
|
{
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
|
|
break;
|
|
#endif /* INET */
|
|
case AF_INET6:
|
|
if (addr->addr32[3] == 0xffffffff) {
|
|
addr->addr32[3] = 0;
|
|
if (addr->addr32[2] == 0xffffffff) {
|
|
addr->addr32[2] = 0;
|
|
if (addr->addr32[1] == 0xffffffff) {
|
|
addr->addr32[1] = 0;
|
|
addr->addr32[0] =
|
|
htonl(ntohl(addr->addr32[0]) + 1);
|
|
} else
|
|
addr->addr32[1] =
|
|
htonl(ntohl(addr->addr32[1]) + 1);
|
|
} else
|
|
addr->addr32[2] =
|
|
htonl(ntohl(addr->addr32[2]) + 1);
|
|
} else
|
|
addr->addr32[3] =
|
|
htonl(ntohl(addr->addr32[3]) + 1);
|
|
break;
|
|
}
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
#define mix(a,b,c) \
|
|
do { \
|
|
a -= b; a -= c; a ^= (c >> 13); \
|
|
b -= c; b -= a; b ^= (a << 8); \
|
|
c -= a; c -= b; c ^= (b >> 13); \
|
|
a -= b; a -= c; a ^= (c >> 12); \
|
|
b -= c; b -= a; b ^= (a << 16); \
|
|
c -= a; c -= b; c ^= (b >> 5); \
|
|
a -= b; a -= c; a ^= (c >> 3); \
|
|
b -= c; b -= a; b ^= (a << 10); \
|
|
c -= a; c -= b; c ^= (b >> 15); \
|
|
} while (0)
|
|
|
|
/*
|
|
* hash function based on bridge_hash in if_bridge.c
|
|
*/
|
|
void
|
|
pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
|
|
struct pf_poolhashkey *key, sa_family_t af)
|
|
{
|
|
u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
|
|
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
a += inaddr->addr32[0];
|
|
b += key->key32[1];
|
|
mix(a, b, c);
|
|
hash->addr32[0] = c + key->key32[2];
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
a += inaddr->addr32[0];
|
|
b += inaddr->addr32[2];
|
|
mix(a, b, c);
|
|
hash->addr32[0] = c;
|
|
a += inaddr->addr32[1];
|
|
b += inaddr->addr32[3];
|
|
c += key->key32[1];
|
|
mix(a, b, c);
|
|
hash->addr32[1] = c;
|
|
a += inaddr->addr32[2];
|
|
b += inaddr->addr32[1];
|
|
c += key->key32[2];
|
|
mix(a, b, c);
|
|
hash->addr32[2] = c;
|
|
a += inaddr->addr32[3];
|
|
b += inaddr->addr32[0];
|
|
c += key->key32[3];
|
|
mix(a, b, c);
|
|
hash->addr32[3] = c;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
int
|
|
pf_map_addr(u_int8_t af, struct pf_pool *rpool, struct pf_addr *saddr,
|
|
struct pf_addr *naddr, struct pf_addr *init_addr)
|
|
{
|
|
unsigned char hash[16];
|
|
struct pf_addr *raddr;
|
|
struct pf_addr *rmask;
|
|
struct pf_pooladdr *acur = rpool->cur;
|
|
|
|
if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
|
|
return (1);
|
|
if (rpool->cur->addr.type == PF_ADDR_DYNIFTL &&
|
|
rpool->cur->addr.p.dyn->undefined)
|
|
return (1);
|
|
if (rpool->cur->addr.type == PF_ADDR_TABLE) {
|
|
if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
|
|
return (1); /* unsupported */
|
|
} else {
|
|
raddr = &rpool->cur->addr.v.a.addr;
|
|
rmask = &rpool->cur->addr.v.a.mask;
|
|
}
|
|
|
|
switch (rpool->opts & PF_POOL_TYPEMASK) {
|
|
case PF_POOL_NONE:
|
|
PF_ACPY(naddr, raddr, af);
|
|
break;
|
|
case PF_POOL_BITMASK:
|
|
PF_POOLMASK(naddr, raddr, rmask, saddr, af);
|
|
break;
|
|
case PF_POOL_RANDOM:
|
|
if (init_addr != NULL && PF_AZERO(init_addr, af)) {
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
rpool->counter.addr32[0] = arc4random();
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (rmask->addr32[3] != 0xffffffff)
|
|
rpool->counter.addr32[3] = arc4random();
|
|
else
|
|
break;
|
|
if (rmask->addr32[2] != 0xffffffff)
|
|
rpool->counter.addr32[2] = arc4random();
|
|
else
|
|
break;
|
|
if (rmask->addr32[1] != 0xffffffff)
|
|
rpool->counter.addr32[1] = arc4random();
|
|
else
|
|
break;
|
|
if (rmask->addr32[0] != 0xffffffff)
|
|
rpool->counter.addr32[0] = arc4random();
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
|
|
PF_ACPY(init_addr, naddr, af);
|
|
|
|
} else {
|
|
PF_AINC(&rpool->counter, af);
|
|
PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
|
|
}
|
|
break;
|
|
case PF_POOL_SRCHASH:
|
|
pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
|
|
PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
|
|
break;
|
|
case PF_POOL_ROUNDROBIN:
|
|
if (rpool->cur->addr.type == PF_ADDR_TABLE) {
|
|
if (!pfr_pool_get(rpool->cur->addr.p.tbl,
|
|
&rpool->tblidx, &rpool->counter,
|
|
&raddr, &rmask, af))
|
|
goto get_addr;
|
|
} else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
|
|
goto get_addr;
|
|
|
|
try_next:
|
|
if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
|
|
rpool->cur = TAILQ_FIRST(&rpool->list);
|
|
if (rpool->cur->addr.type == PF_ADDR_TABLE) {
|
|
rpool->tblidx = -1;
|
|
if (pfr_pool_get(rpool->cur->addr.p.tbl,
|
|
&rpool->tblidx, &rpool->counter,
|
|
&raddr, &rmask, af)) {
|
|
/* table contain no address of type 'af' */
|
|
if (rpool->cur != acur)
|
|
goto try_next;
|
|
return (1);
|
|
}
|
|
} else {
|
|
raddr = &rpool->cur->addr.v.a.addr;
|
|
rmask = &rpool->cur->addr.v.a.mask;
|
|
PF_ACPY(&rpool->counter, raddr, af);
|
|
}
|
|
|
|
get_addr:
|
|
PF_ACPY(naddr, &rpool->counter, af);
|
|
PF_AINC(&rpool->counter, af);
|
|
break;
|
|
}
|
|
|
|
if (pf_status.debug >= PF_DEBUG_MISC &&
|
|
(rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
|
|
printf("pf_map_addr: selected address: ");
|
|
pf_print_host(naddr, 0, af);
|
|
printf("\n");
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_pool *rpool,
|
|
struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
|
|
struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high)
|
|
{
|
|
struct pf_tree_node key;
|
|
struct pf_addr init_addr;
|
|
u_int16_t cut;
|
|
|
|
bzero(&init_addr, sizeof(init_addr));
|
|
if (pf_map_addr(af, rpool, saddr, naddr, &init_addr))
|
|
return (1);
|
|
|
|
do {
|
|
key.af = af;
|
|
key.proto = proto;
|
|
PF_ACPY(&key.addr[0], daddr, key.af);
|
|
PF_ACPY(&key.addr[1], naddr, key.af);
|
|
key.port[0] = dport;
|
|
|
|
/*
|
|
* port search; start random, step;
|
|
* similar 2 portloop in in_pcbbind
|
|
*/
|
|
if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP)) {
|
|
key.port[1] = 0;
|
|
if (pf_find_state(&tree_ext_gwy, &key) == NULL)
|
|
return (0);
|
|
} else if (low == 0 && high == 0) {
|
|
key.port[1] = *nport;
|
|
if (pf_find_state(&tree_ext_gwy, &key) == NULL) {
|
|
return (0);
|
|
}
|
|
} else if (low == high) {
|
|
key.port[1] = htons(low);
|
|
if (pf_find_state(&tree_ext_gwy, &key) == NULL) {
|
|
*nport = htons(low);
|
|
return (0);
|
|
}
|
|
} else {
|
|
u_int16_t tmp;
|
|
|
|
if (low > high) {
|
|
tmp = low;
|
|
low = high;
|
|
high = tmp;
|
|
}
|
|
/* low < high */
|
|
cut = arc4random() % (1 + high - low) + low;
|
|
/* low <= cut <= high */
|
|
for (tmp = cut; tmp <= high; ++(tmp)) {
|
|
key.port[1] = htons(tmp);
|
|
if (pf_find_state(&tree_ext_gwy, &key) ==
|
|
NULL) {
|
|
*nport = htons(tmp);
|
|
return (0);
|
|
}
|
|
}
|
|
for (tmp = cut - 1; tmp >= low; --(tmp)) {
|
|
key.port[1] = htons(tmp);
|
|
if (pf_find_state(&tree_ext_gwy, &key) ==
|
|
NULL) {
|
|
*nport = htons(tmp);
|
|
return (0);
|
|
}
|
|
}
|
|
}
|
|
|
|
switch (rpool->opts & PF_POOL_TYPEMASK) {
|
|
case PF_POOL_RANDOM:
|
|
case PF_POOL_ROUNDROBIN:
|
|
if (pf_map_addr(af, rpool, saddr, naddr, &init_addr))
|
|
return (1);
|
|
break;
|
|
case PF_POOL_NONE:
|
|
case PF_POOL_SRCHASH:
|
|
case PF_POOL_BITMASK:
|
|
default:
|
|
return (1);
|
|
break;
|
|
}
|
|
} while (! PF_AEQ(&init_addr, naddr, af) );
|
|
|
|
return (1); /* none available */
|
|
}
|
|
|
|
struct pf_rule *
|
|
pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
|
|
int direction, struct ifnet *ifp, struct pf_addr *saddr, u_int16_t sport,
|
|
struct pf_addr *daddr, u_int16_t dport, int rs_num)
|
|
{
|
|
struct pf_rule *r, *rm = NULL, *anchorrule = NULL;
|
|
struct pf_ruleset *ruleset = NULL;
|
|
|
|
r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
|
|
while (r && rm == NULL) {
|
|
struct pf_rule_addr *src = NULL, *dst = NULL;
|
|
struct pf_addr_wrap *xdst = NULL;
|
|
|
|
if (r->action == PF_BINAT && direction == PF_IN) {
|
|
src = &r->dst;
|
|
if (r->rpool.cur != NULL)
|
|
xdst = &r->rpool.cur->addr;
|
|
} else {
|
|
src = &r->src;
|
|
dst = &r->dst;
|
|
}
|
|
|
|
r->evaluations++;
|
|
if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) ||
|
|
(r->ifp == ifp && r->ifnot)))
|
|
r = r->skip[PF_SKIP_IFP].ptr;
|
|
else if (r->direction && r->direction != direction)
|
|
r = r->skip[PF_SKIP_DIR].ptr;
|
|
else if (r->af && r->af != pd->af)
|
|
r = r->skip[PF_SKIP_AF].ptr;
|
|
else if (r->proto && r->proto != pd->proto)
|
|
r = r->skip[PF_SKIP_PROTO].ptr;
|
|
else if (PF_MISMATCHAW(&src->addr, saddr, pd->af, src->not))
|
|
r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
|
|
PF_SKIP_DST_ADDR].ptr;
|
|
else if (src->port_op && !pf_match_port(src->port_op,
|
|
src->port[0], src->port[1], sport))
|
|
r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
|
|
PF_SKIP_DST_PORT].ptr;
|
|
else if (dst != NULL &&
|
|
PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->not))
|
|
r = r->skip[PF_SKIP_DST_ADDR].ptr;
|
|
else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af, 0))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (dst != NULL && dst->port_op &&
|
|
!pf_match_port(dst->port_op, dst->port[0],
|
|
dst->port[1], dport))
|
|
r = r->skip[PF_SKIP_DST_PORT].ptr;
|
|
else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
|
|
IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
|
|
off, pd->hdr.tcp), r->os_fingerprint)))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->anchorname[0] && r->anchor == NULL)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->anchor == NULL)
|
|
rm = r;
|
|
else
|
|
PF_STEP_INTO_ANCHOR(r, anchorrule, ruleset, rs_num);
|
|
if (r == NULL && anchorrule != NULL)
|
|
PF_STEP_OUT_OF_ANCHOR(r, anchorrule, ruleset,
|
|
rs_num);
|
|
}
|
|
if (rm != NULL && (rm->action == PF_NONAT ||
|
|
rm->action == PF_NORDR || rm->action == PF_NOBINAT))
|
|
return (NULL);
|
|
return (rm);
|
|
}
|
|
|
|
struct pf_rule *
|
|
pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
|
|
struct ifnet *ifp,
|
|
struct pf_addr *saddr, u_int16_t sport,
|
|
struct pf_addr *daddr, u_int16_t dport,
|
|
struct pf_addr *naddr, u_int16_t *nport)
|
|
{
|
|
struct pf_rule *r = NULL;
|
|
|
|
if (direction == PF_OUT) {
|
|
r = pf_match_translation(pd, m, off, direction, ifp, saddr,
|
|
sport, daddr, dport, PF_RULESET_BINAT);
|
|
if (r == NULL)
|
|
r = pf_match_translation(pd, m, off, direction, ifp,
|
|
saddr, sport, daddr, dport, PF_RULESET_NAT);
|
|
} else {
|
|
r = pf_match_translation(pd, m, off, direction, ifp, saddr,
|
|
sport, daddr, dport, PF_RULESET_RDR);
|
|
if (r == NULL)
|
|
r = pf_match_translation(pd, m, off, direction, ifp,
|
|
saddr, sport, daddr, dport, PF_RULESET_BINAT);
|
|
}
|
|
|
|
if (r != NULL) {
|
|
switch (r->action) {
|
|
case PF_NONAT:
|
|
case PF_NOBINAT:
|
|
case PF_NORDR:
|
|
return (NULL);
|
|
break;
|
|
case PF_NAT:
|
|
if (pf_get_sport(pd->af, pd->proto, &r->rpool, saddr,
|
|
daddr, dport, naddr, nport, r->rpool.proxy_port[0],
|
|
r->rpool.proxy_port[1])) {
|
|
DPFPRINTF(PF_DEBUG_MISC,
|
|
("pf: NAT proxy port allocation "
|
|
"(%u-%u) failed\n",
|
|
r->rpool.proxy_port[0],
|
|
r->rpool.proxy_port[1]));
|
|
return (NULL);
|
|
}
|
|
break;
|
|
case PF_BINAT:
|
|
switch (direction) {
|
|
case PF_OUT:
|
|
if (r->rpool.cur->addr.type ==
|
|
PF_ADDR_DYNIFTL &&
|
|
r->rpool.cur->addr.p.dyn->undefined)
|
|
return (NULL);
|
|
else
|
|
PF_POOLMASK(naddr,
|
|
&r->rpool.cur->addr.v.a.addr,
|
|
&r->rpool.cur->addr.v.a.mask,
|
|
saddr, pd->af);
|
|
break;
|
|
case PF_IN:
|
|
if (r->src.addr.type == PF_ADDR_DYNIFTL &&
|
|
r->src.addr.p.dyn->undefined)
|
|
return (NULL);
|
|
else
|
|
PF_POOLMASK(naddr,
|
|
&r->src.addr.v.a.addr,
|
|
&r->src.addr.v.a.mask, daddr,
|
|
pd->af);
|
|
break;
|
|
}
|
|
break;
|
|
case PF_RDR: {
|
|
if (pf_map_addr(r->af, &r->rpool, saddr, naddr, NULL))
|
|
return (NULL);
|
|
|
|
if (r->rpool.proxy_port[1]) {
|
|
u_int32_t tmp_nport;
|
|
|
|
tmp_nport = ((ntohs(dport) -
|
|
ntohs(r->dst.port[0])) %
|
|
(r->rpool.proxy_port[1] -
|
|
r->rpool.proxy_port[0] + 1)) +
|
|
r->rpool.proxy_port[0];
|
|
|
|
/* wrap around if necessary */
|
|
if (tmp_nport > 65535)
|
|
tmp_nport -= 65535;
|
|
*nport = htons((u_int16_t)tmp_nport);
|
|
} else if (r->rpool.proxy_port[0])
|
|
*nport = htons(r->rpool.proxy_port[0]);
|
|
break;
|
|
}
|
|
default:
|
|
return (NULL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return (r);
|
|
}
|
|
|
|
int
|
|
pf_socket_lookup(uid_t *uid, gid_t *gid, int direction, sa_family_t af,
|
|
int proto, struct pf_pdesc *pd)
|
|
{
|
|
struct pf_addr *saddr, *daddr;
|
|
u_int16_t sport, dport;
|
|
#if defined(__FreeBSD__)
|
|
struct inpcbinfo *pi;
|
|
#else
|
|
struct inpcbtable *tb;
|
|
#endif
|
|
struct inpcb *inp;
|
|
|
|
*uid = UID_MAX;
|
|
*gid = GID_MAX;
|
|
switch (proto) {
|
|
case IPPROTO_TCP:
|
|
sport = pd->hdr.tcp->th_sport;
|
|
dport = pd->hdr.tcp->th_dport;
|
|
#if defined(__FreeBSD__)
|
|
pi = &tcbinfo;
|
|
#else
|
|
tb = &tcbtable;
|
|
#endif
|
|
break;
|
|
case IPPROTO_UDP:
|
|
sport = pd->hdr.udp->uh_sport;
|
|
dport = pd->hdr.udp->uh_dport;
|
|
#if defined(__FreeBSD__)
|
|
pi = &udbinfo;
|
|
#else
|
|
tb = &udbtable;
|
|
#endif
|
|
break;
|
|
default:
|
|
return (0);
|
|
}
|
|
if (direction == PF_IN) {
|
|
saddr = pd->src;
|
|
daddr = pd->dst;
|
|
} else {
|
|
u_int16_t p;
|
|
|
|
p = sport;
|
|
sport = dport;
|
|
dport = p;
|
|
saddr = pd->dst;
|
|
daddr = pd->src;
|
|
}
|
|
switch(af) {
|
|
case AF_INET:
|
|
#if defined(__FreeBSD__)
|
|
#if (__FreeBSD_version >= 500043)
|
|
INP_INFO_RLOCK(pi); /* XXX LOR */
|
|
#endif
|
|
inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4,
|
|
dport, 0, NULL);
|
|
if (inp == NULL) {
|
|
inp = in_pcblookup_hash(pi, saddr->v4, sport,
|
|
daddr->v4, dport, INPLOOKUP_WILDCARD, NULL);
|
|
if(inp == NULL) {
|
|
#if (__FreeBSD_version >= 500043)
|
|
INP_INFO_RUNLOCK(pi);
|
|
#endif
|
|
return (0);
|
|
}
|
|
}
|
|
#else
|
|
inp = in_pcbhashlookup(tb, saddr->v4, sport, daddr->v4, dport);
|
|
if (inp == NULL) {
|
|
inp = in_pcblookup(tb, &saddr->v4, sport, &daddr->v4,
|
|
dport, INPLOOKUP_WILDCARD);
|
|
if (inp == NULL)
|
|
return (0);
|
|
}
|
|
#endif
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
#if defined(__FreeBSD__)
|
|
#if (__FreeBSD_version >= 500043)
|
|
INP_INFO_RLOCK(pi);
|
|
#endif
|
|
inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
|
|
&daddr->v6, dport, 0, NULL);
|
|
if (inp == NULL) {
|
|
inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
|
|
&daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
|
|
if (inp == NULL) {
|
|
#if (__FreeBSD_version >= 500043)
|
|
INP_INFO_RUNLOCK(pi);
|
|
#endif
|
|
return (0);
|
|
}
|
|
}
|
|
#else
|
|
inp = in6_pcbhashlookup(tb, &saddr->v6, sport, &daddr->v6,
|
|
dport);
|
|
if (inp == NULL) {
|
|
inp = in_pcblookup(tb, &saddr->v6, sport, &daddr->v6,
|
|
dport, INPLOOKUP_WILDCARD | INPLOOKUP_IPV6);
|
|
if (inp == NULL)
|
|
return (0);
|
|
}
|
|
#endif
|
|
break;
|
|
#endif /* INET6 */
|
|
|
|
default:
|
|
return (0);
|
|
}
|
|
#if defined(__FreeBSD__)
|
|
#if (__FreeBSD_version >= 500043)
|
|
INP_LOCK(inp);
|
|
#endif
|
|
*uid = inp->inp_socket->so_cred->cr_uid;
|
|
*gid = inp->inp_socket->so_cred->cr_groups[0];
|
|
#if (__FreeBSD_version >= 500043)
|
|
INP_UNLOCK(inp);
|
|
INP_INFO_RUNLOCK(pi);
|
|
#endif
|
|
#else
|
|
*uid = inp->inp_socket->so_euid;
|
|
*gid = inp->inp_socket->so_egid;
|
|
#endif
|
|
return (1);
|
|
}
|
|
|
|
u_int8_t
|
|
pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
|
|
{
|
|
int hlen;
|
|
u_int8_t hdr[60];
|
|
u_int8_t *opt, optlen;
|
|
u_int8_t wscale = 0;
|
|
|
|
hlen = th_off << 2; /* hlen <= sizeof(hdr) */
|
|
if (hlen <= sizeof(struct tcphdr))
|
|
return (0);
|
|
if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
|
|
return (0);
|
|
opt = hdr + sizeof(struct tcphdr);
|
|
hlen -= sizeof(struct tcphdr);
|
|
while (hlen >= 3) {
|
|
switch (*opt) {
|
|
case TCPOPT_EOL:
|
|
case TCPOPT_NOP:
|
|
++opt;
|
|
--hlen;
|
|
break;
|
|
case TCPOPT_WINDOW:
|
|
wscale = opt[2];
|
|
if (wscale > TCP_MAX_WINSHIFT)
|
|
wscale = TCP_MAX_WINSHIFT;
|
|
wscale |= PF_WSCALE_FLAG;
|
|
/* fallthrough */
|
|
default:
|
|
optlen = opt[1];
|
|
if (optlen < 2)
|
|
optlen = 2;
|
|
hlen -= optlen;
|
|
opt += optlen;
|
|
}
|
|
}
|
|
return (wscale);
|
|
}
|
|
|
|
u_int16_t
|
|
pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
|
|
{
|
|
int hlen;
|
|
u_int8_t hdr[60];
|
|
u_int8_t *opt, optlen;
|
|
u_int16_t mss = tcp_mssdflt;
|
|
|
|
hlen = th_off << 2; /* hlen <= sizeof(hdr) */
|
|
if (hlen <= sizeof(struct tcphdr))
|
|
return (0);
|
|
if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
|
|
return (0);
|
|
opt = hdr + sizeof(struct tcphdr);
|
|
hlen -= sizeof(struct tcphdr);
|
|
while (hlen >= TCPOLEN_MAXSEG) {
|
|
switch (*opt) {
|
|
case TCPOPT_EOL:
|
|
case TCPOPT_NOP:
|
|
++opt;
|
|
--hlen;
|
|
break;
|
|
case TCPOPT_MAXSEG:
|
|
bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
|
|
/* fallthrough */
|
|
default:
|
|
optlen = opt[1];
|
|
if (optlen < 2)
|
|
optlen = 2;
|
|
hlen -= optlen;
|
|
opt += optlen;
|
|
}
|
|
}
|
|
return (mss);
|
|
}
|
|
|
|
u_int16_t
|
|
pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
|
|
{
|
|
#ifdef INET
|
|
struct sockaddr_in *dst;
|
|
struct route ro;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
struct sockaddr_in6 *dst6;
|
|
struct route_in6 ro6;
|
|
#endif /* INET6 */
|
|
struct rtentry *rt = NULL;
|
|
int hlen;
|
|
u_int16_t mss = tcp_mssdflt;
|
|
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
hlen = sizeof(struct ip);
|
|
bzero(&ro, sizeof(ro));
|
|
dst = (struct sockaddr_in *)&ro.ro_dst;
|
|
dst->sin_family = AF_INET;
|
|
dst->sin_len = sizeof(*dst);
|
|
dst->sin_addr = addr->v4;
|
|
#if defined(__FreeBSD__)
|
|
#ifdef RTF_PRCLONING
|
|
rtalloc_ign(&ro, (RTF_CLONING | RTF_PRCLONING));
|
|
#else /* !RTF_PRCLONING */
|
|
rtalloc_ign(&ro, RTF_CLONING);
|
|
#endif
|
|
#else /* ! __FreeBSD__ */
|
|
rtalloc_noclone(&ro, NO_CLONING);
|
|
#endif
|
|
rt = ro.ro_rt;
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
hlen = sizeof(struct ip6_hdr);
|
|
bzero(&ro6, sizeof(ro6));
|
|
dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
|
|
dst6->sin6_family = AF_INET6;
|
|
dst6->sin6_len = sizeof(*dst6);
|
|
dst6->sin6_addr = addr->v6;
|
|
#if defined(__FreeBSD__)
|
|
#ifdef RTF_PRCLONING
|
|
rtalloc_ign((struct route *)&ro6,
|
|
(RTF_CLONING | RTF_PRCLONING));
|
|
#else /* !RTF_PRCLONING */
|
|
rtalloc_ign((struct route *)&ro6, RTF_CLONING);
|
|
#endif
|
|
#else /* ! __FreeBSD__ */
|
|
rtalloc_noclone((struct route *)&ro6, NO_CLONING);
|
|
#endif
|
|
rt = ro6.ro_rt;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
if (rt && rt->rt_ifp) {
|
|
mss = rt->rt_ifp->if_mtu - hlen - sizeof(struct tcphdr);
|
|
mss = max(tcp_mssdflt, mss);
|
|
RTFREE(rt);
|
|
}
|
|
mss = min(mss, offer);
|
|
mss = max(mss, 64); /* sanity - at least max opt space */
|
|
return (mss);
|
|
}
|
|
|
|
void
|
|
pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
|
|
{
|
|
struct pf_rule *r = s->rule.ptr;
|
|
|
|
s->rt_ifp = NULL;
|
|
if (!r->rt || r->rt == PF_FASTROUTE)
|
|
return;
|
|
switch (s->af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
pf_map_addr(AF_INET, &r->rpool, saddr,
|
|
&s->rt_addr, NULL);
|
|
s->rt_ifp = r->rpool.cur->ifp;
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
pf_map_addr(AF_INET6, &r->rpool, saddr,
|
|
&s->rt_addr, NULL);
|
|
s->rt_ifp = r->rpool.cur->ifp;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
int
|
|
pf_test_tcp(struct pf_rule **rm, struct pf_state **sm, int direction,
|
|
struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h,
|
|
struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
|
|
{
|
|
struct pf_rule *nat = NULL, *rdr = NULL;
|
|
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
|
|
struct pf_addr baddr, naddr;
|
|
struct tcphdr *th = pd->hdr.tcp;
|
|
u_int16_t bport, nport = 0;
|
|
sa_family_t af = pd->af;
|
|
int lookup = -1;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
struct pf_rule *r, *a = NULL;
|
|
struct pf_ruleset *ruleset = NULL;
|
|
u_short reason;
|
|
int rewrite = 0;
|
|
struct pf_tag *pftag = NULL;
|
|
int tag = -1;
|
|
u_int16_t mss = tcp_mssdflt;
|
|
|
|
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
|
|
|
|
if (direction == PF_OUT) {
|
|
bport = nport = th->th_sport;
|
|
/* check outgoing packet for BINAT/NAT */
|
|
if ((nat = pf_get_translation(pd, m, off, PF_OUT, ifp,
|
|
saddr, th->th_sport, daddr, th->th_dport,
|
|
&naddr, &nport)) != NULL) {
|
|
PF_ACPY(&baddr, saddr, af);
|
|
pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
|
|
&th->th_sum, &naddr, nport, 0, af);
|
|
rewrite++;
|
|
if (nat->natpass)
|
|
r = NULL;
|
|
}
|
|
} else {
|
|
bport = nport = th->th_dport;
|
|
/* check incoming packet for BINAT/RDR */
|
|
if ((rdr = pf_get_translation(pd, m, off, PF_IN, ifp, saddr,
|
|
th->th_sport, daddr, th->th_dport,
|
|
&naddr, &nport)) != NULL) {
|
|
PF_ACPY(&baddr, daddr, af);
|
|
pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
|
|
&th->th_sum, &naddr, nport, 0, af);
|
|
rewrite++;
|
|
if (rdr->natpass)
|
|
r = NULL;
|
|
}
|
|
}
|
|
|
|
while (r != NULL) {
|
|
r->evaluations++;
|
|
if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) ||
|
|
(r->ifp == ifp && r->ifnot)))
|
|
r = r->skip[PF_SKIP_IFP].ptr;
|
|
else if (r->direction && r->direction != direction)
|
|
r = r->skip[PF_SKIP_DIR].ptr;
|
|
else if (r->af && r->af != af)
|
|
r = r->skip[PF_SKIP_AF].ptr;
|
|
else if (r->proto && r->proto != IPPROTO_TCP)
|
|
r = r->skip[PF_SKIP_PROTO].ptr;
|
|
else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
|
|
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
|
|
else if (r->src.port_op && !pf_match_port(r->src.port_op,
|
|
r->src.port[0], r->src.port[1], th->th_sport))
|
|
r = r->skip[PF_SKIP_SRC_PORT].ptr;
|
|
else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
|
|
r = r->skip[PF_SKIP_DST_ADDR].ptr;
|
|
else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
|
|
r->dst.port[0], r->dst.port[1], th->th_dport))
|
|
r = r->skip[PF_SKIP_DST_PORT].ptr;
|
|
else if (r->tos && !(r->tos & pd->tos))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->rule_flag & PFRULE_FRAGMENT)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if ((r->flagset & th->th_flags) != r->flags)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->uid.op && (lookup != -1 || (lookup =
|
|
pf_socket_lookup(&uid, &gid, direction, af, IPPROTO_TCP,
|
|
pd), 1)) &&
|
|
!pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
|
|
uid))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->gid.op && (lookup != -1 || (lookup =
|
|
pf_socket_lookup(&uid, &gid, direction, af, IPPROTO_TCP,
|
|
pd), 1)) &&
|
|
!pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
|
|
gid))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->match_tag &&
|
|
!pf_match_tag(m, r, nat, rdr, pftag, &tag))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->anchorname[0] && r->anchor == NULL)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->os_fingerprint != PF_OSFP_ANY && !pf_osfp_match(
|
|
pf_osfp_fingerprint(pd, m, off, th), r->os_fingerprint))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else {
|
|
if (r->tag)
|
|
tag = r->tag;
|
|
if (r->anchor == NULL) {
|
|
*rm = r;
|
|
*am = a;
|
|
*rsm = ruleset;
|
|
if ((*rm)->quick)
|
|
break;
|
|
r = TAILQ_NEXT(r, entries);
|
|
} else
|
|
PF_STEP_INTO_ANCHOR(r, a, ruleset,
|
|
PF_RULESET_FILTER);
|
|
}
|
|
if (r == NULL && a != NULL)
|
|
PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
|
|
PF_RULESET_FILTER);
|
|
}
|
|
r = *rm;
|
|
a = *am;
|
|
ruleset = *rsm;
|
|
|
|
r->packets++;
|
|
r->bytes += pd->tot_len;
|
|
if (a != NULL) {
|
|
a->packets++;
|
|
a->bytes += pd->tot_len;
|
|
}
|
|
REASON_SET(&reason, PFRES_MATCH);
|
|
|
|
if (r->log) {
|
|
if (rewrite)
|
|
m_copyback(m, off, sizeof(*th), (caddr_t)th);
|
|
PFLOG_PACKET(ifp, h, m, af, direction, reason, r, a, ruleset);
|
|
}
|
|
|
|
if ((r->action == PF_DROP) &&
|
|
((r->rule_flag & PFRULE_RETURNRST) ||
|
|
(r->rule_flag & PFRULE_RETURNICMP) ||
|
|
(r->rule_flag & PFRULE_RETURN))) {
|
|
/* undo NAT changes, if they have taken place */
|
|
if (nat != NULL) {
|
|
pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
|
|
&th->th_sum, &baddr, bport, 0, af);
|
|
rewrite++;
|
|
} else if (rdr != NULL) {
|
|
pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
|
|
&th->th_sum, &baddr, bport, 0, af);
|
|
rewrite++;
|
|
}
|
|
if (((r->rule_flag & PFRULE_RETURNRST) ||
|
|
(r->rule_flag & PFRULE_RETURN)) &&
|
|
!(th->th_flags & TH_RST)) {
|
|
u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
|
|
|
|
if (th->th_flags & TH_SYN)
|
|
ack++;
|
|
if (th->th_flags & TH_FIN)
|
|
ack++;
|
|
pf_send_tcp(r, af, pd->dst,
|
|
pd->src, th->th_dport, th->th_sport,
|
|
ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
|
|
r->return_ttl);
|
|
} else if ((af == AF_INET) && r->return_icmp)
|
|
pf_send_icmp(m, r->return_icmp >> 8,
|
|
r->return_icmp & 255, af, r);
|
|
else if ((af == AF_INET6) && r->return_icmp6)
|
|
pf_send_icmp(m, r->return_icmp6 >> 8,
|
|
r->return_icmp6 & 255, af, r);
|
|
}
|
|
|
|
if (r->action == PF_DROP)
|
|
return (PF_DROP);
|
|
|
|
if (pf_tag_packet(m, pftag, tag)) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
if (r->keep_state || nat != NULL || rdr != NULL ||
|
|
(pd->flags & PFDESC_TCP_NORM)) {
|
|
/* create new state */
|
|
u_int16_t len;
|
|
struct pf_state *s = NULL;
|
|
|
|
len = pd->tot_len - off - (th->th_off << 2);
|
|
if (!r->max_states || r->states < r->max_states)
|
|
s = pool_get(&pf_state_pl, PR_NOWAIT);
|
|
if (s == NULL) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
return (PF_DROP);
|
|
}
|
|
bzero(s, sizeof(*s));
|
|
r->states++;
|
|
if (a != NULL)
|
|
a->states++;
|
|
s->rule.ptr = r;
|
|
if (nat != NULL)
|
|
s->nat_rule.ptr = nat;
|
|
else
|
|
s->nat_rule.ptr = rdr;
|
|
if (s->nat_rule.ptr != NULL)
|
|
s->nat_rule.ptr->states++;
|
|
s->anchor.ptr = a;
|
|
s->allow_opts = r->allow_opts;
|
|
s->log = r->log & 2;
|
|
s->proto = IPPROTO_TCP;
|
|
s->direction = direction;
|
|
s->af = af;
|
|
if (direction == PF_OUT) {
|
|
PF_ACPY(&s->gwy.addr, saddr, af);
|
|
s->gwy.port = th->th_sport; /* sport */
|
|
PF_ACPY(&s->ext.addr, daddr, af);
|
|
s->ext.port = th->th_dport;
|
|
if (nat != NULL) {
|
|
PF_ACPY(&s->lan.addr, &baddr, af);
|
|
s->lan.port = bport;
|
|
} else {
|
|
PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
|
|
s->lan.port = s->gwy.port;
|
|
}
|
|
} else {
|
|
PF_ACPY(&s->lan.addr, daddr, af);
|
|
s->lan.port = th->th_dport;
|
|
PF_ACPY(&s->ext.addr, saddr, af);
|
|
s->ext.port = th->th_sport;
|
|
if (rdr != NULL) {
|
|
PF_ACPY(&s->gwy.addr, &baddr, af);
|
|
s->gwy.port = bport;
|
|
} else {
|
|
PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
|
|
s->gwy.port = s->lan.port;
|
|
}
|
|
}
|
|
|
|
s->src.seqlo = ntohl(th->th_seq);
|
|
s->src.seqhi = s->src.seqlo + len + 1;
|
|
if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
|
|
r->keep_state == PF_STATE_MODULATE) {
|
|
/* Generate sequence number modulator */
|
|
while ((s->src.seqdiff = arc4random()) == 0)
|
|
;
|
|
pf_change_a(&th->th_seq, &th->th_sum,
|
|
htonl(s->src.seqlo + s->src.seqdiff), 0);
|
|
rewrite = 1;
|
|
} else
|
|
s->src.seqdiff = 0;
|
|
if (th->th_flags & TH_SYN) {
|
|
s->src.seqhi++;
|
|
s->src.wscale = pf_get_wscale(m, off, th->th_off, af);
|
|
}
|
|
s->src.max_win = MAX(ntohs(th->th_win), 1);
|
|
if (s->src.wscale & PF_WSCALE_MASK) {
|
|
/* Remove scale factor from initial window */
|
|
int win = s->src.max_win;
|
|
win += 1 << (s->src.wscale & PF_WSCALE_MASK);
|
|
s->src.max_win = (win - 1) >>
|
|
(s->src.wscale & PF_WSCALE_MASK);
|
|
}
|
|
if (th->th_flags & TH_FIN)
|
|
s->src.seqhi++;
|
|
s->dst.seqhi = 1;
|
|
s->dst.max_win = 1;
|
|
s->src.state = TCPS_SYN_SENT;
|
|
s->dst.state = TCPS_CLOSED;
|
|
#if defined(__FreeBSD__)
|
|
s->creation = time_second;
|
|
s->expire = time_second;
|
|
#else
|
|
s->creation = time.tv_sec;
|
|
s->expire = time.tv_sec;
|
|
#endif
|
|
s->timeout = PFTM_TCP_FIRST_PACKET;
|
|
s->packets[0] = 1;
|
|
s->bytes[0] = pd->tot_len;
|
|
pf_set_rt_ifp(s, saddr);
|
|
|
|
if ((pd->flags & PFDESC_TCP_NORM) && pf_normalize_tcp_init(m,
|
|
off, pd, th, &s->src, &s->dst)) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
pool_put(&pf_state_pl, s);
|
|
return (PF_DROP);
|
|
}
|
|
if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
|
|
pf_normalize_tcp_stateful(m, off, pd, &reason, th, &s->src,
|
|
&s->dst, &rewrite)) {
|
|
pf_normalize_tcp_cleanup(s);
|
|
pool_put(&pf_state_pl, s);
|
|
return (PF_DROP);
|
|
}
|
|
if (pf_insert_state(s)) {
|
|
pf_normalize_tcp_cleanup(s);
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
pool_put(&pf_state_pl, s);
|
|
return (PF_DROP);
|
|
} else
|
|
*sm = s;
|
|
if ((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
|
|
r->keep_state == PF_STATE_SYNPROXY) {
|
|
s->src.state = PF_TCPS_PROXY_SRC;
|
|
if (nat != NULL)
|
|
pf_change_ap(saddr, &th->th_sport,
|
|
pd->ip_sum, &th->th_sum, &baddr,
|
|
bport, 0, af);
|
|
else if (rdr != NULL)
|
|
pf_change_ap(daddr, &th->th_dport,
|
|
pd->ip_sum, &th->th_sum, &baddr,
|
|
bport, 0, af);
|
|
s->src.seqhi = arc4random();
|
|
/* Find mss option */
|
|
mss = pf_get_mss(m, off, th->th_off, af);
|
|
mss = pf_calc_mss(saddr, af, mss);
|
|
mss = pf_calc_mss(daddr, af, mss);
|
|
s->src.mss = mss;
|
|
pf_send_tcp(r, af, daddr, saddr, th->th_dport,
|
|
th->th_sport, s->src.seqhi,
|
|
ntohl(th->th_seq) + 1, TH_SYN|TH_ACK, 0, s->src.mss, 0);
|
|
return (PF_SYNPROXY_DROP);
|
|
}
|
|
}
|
|
|
|
/* copy back packet headers if we performed NAT operations */
|
|
if (rewrite)
|
|
m_copyback(m, off, sizeof(*th), (caddr_t)th);
|
|
|
|
return (PF_PASS);
|
|
}
|
|
|
|
int
|
|
pf_test_udp(struct pf_rule **rm, struct pf_state **sm, int direction,
|
|
struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h,
|
|
struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
|
|
{
|
|
struct pf_rule *nat = NULL, *rdr = NULL;
|
|
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
|
|
struct pf_addr baddr, naddr;
|
|
struct udphdr *uh = pd->hdr.udp;
|
|
u_int16_t bport, nport = 0;
|
|
sa_family_t af = pd->af;
|
|
int lookup = -1;
|
|
uid_t uid;
|
|
gid_t gid;
|
|
struct pf_rule *r, *a = NULL;
|
|
struct pf_ruleset *ruleset = NULL;
|
|
u_short reason;
|
|
int rewrite = 0;
|
|
struct pf_tag *pftag = NULL;
|
|
int tag = -1;
|
|
|
|
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
|
|
|
|
if (direction == PF_OUT) {
|
|
bport = nport = uh->uh_sport;
|
|
/* check outgoing packet for BINAT/NAT */
|
|
if ((nat = pf_get_translation(pd, m, off, PF_OUT, ifp,
|
|
saddr, uh->uh_sport, daddr, uh->uh_dport,
|
|
&naddr, &nport)) != NULL) {
|
|
PF_ACPY(&baddr, saddr, af);
|
|
pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
|
|
&uh->uh_sum, &naddr, nport, 1, af);
|
|
rewrite++;
|
|
if (nat->natpass)
|
|
r = NULL;
|
|
}
|
|
} else {
|
|
bport = nport = uh->uh_dport;
|
|
/* check incoming packet for BINAT/RDR */
|
|
if ((rdr = pf_get_translation(pd, m, off, PF_IN, ifp, saddr,
|
|
uh->uh_sport, daddr, uh->uh_dport, &naddr, &nport))
|
|
!= NULL) {
|
|
PF_ACPY(&baddr, daddr, af);
|
|
pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
|
|
&uh->uh_sum, &naddr, nport, 1, af);
|
|
rewrite++;
|
|
if (rdr->natpass)
|
|
r = NULL;
|
|
}
|
|
}
|
|
|
|
while (r != NULL) {
|
|
r->evaluations++;
|
|
if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) ||
|
|
(r->ifp == ifp && r->ifnot)))
|
|
r = r->skip[PF_SKIP_IFP].ptr;
|
|
else if (r->direction && r->direction != direction)
|
|
r = r->skip[PF_SKIP_DIR].ptr;
|
|
else if (r->af && r->af != af)
|
|
r = r->skip[PF_SKIP_AF].ptr;
|
|
else if (r->proto && r->proto != IPPROTO_UDP)
|
|
r = r->skip[PF_SKIP_PROTO].ptr;
|
|
else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
|
|
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
|
|
else if (r->src.port_op && !pf_match_port(r->src.port_op,
|
|
r->src.port[0], r->src.port[1], uh->uh_sport))
|
|
r = r->skip[PF_SKIP_SRC_PORT].ptr;
|
|
else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
|
|
r = r->skip[PF_SKIP_DST_ADDR].ptr;
|
|
else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
|
|
r->dst.port[0], r->dst.port[1], uh->uh_dport))
|
|
r = r->skip[PF_SKIP_DST_PORT].ptr;
|
|
else if (r->tos && !(r->tos & pd->tos))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->rule_flag & PFRULE_FRAGMENT)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->uid.op && (lookup != -1 || (lookup =
|
|
pf_socket_lookup(&uid, &gid, direction, af, IPPROTO_UDP,
|
|
pd), 1)) &&
|
|
!pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
|
|
uid))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->gid.op && (lookup != -1 || (lookup =
|
|
pf_socket_lookup(&uid, &gid, direction, af, IPPROTO_UDP,
|
|
pd), 1)) &&
|
|
!pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
|
|
gid))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->match_tag &&
|
|
!pf_match_tag(m, r, nat, rdr, pftag, &tag))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->anchorname[0] && r->anchor == NULL)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->os_fingerprint != PF_OSFP_ANY)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else {
|
|
if (r->tag)
|
|
tag = r->tag;
|
|
if (r->anchor == NULL) {
|
|
*rm = r;
|
|
*am = a;
|
|
*rsm = ruleset;
|
|
if ((*rm)->quick)
|
|
break;
|
|
r = TAILQ_NEXT(r, entries);
|
|
} else
|
|
PF_STEP_INTO_ANCHOR(r, a, ruleset,
|
|
PF_RULESET_FILTER);
|
|
}
|
|
if (r == NULL && a != NULL)
|
|
PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
|
|
PF_RULESET_FILTER);
|
|
}
|
|
r = *rm;
|
|
a = *am;
|
|
ruleset = *rsm;
|
|
|
|
r->packets++;
|
|
r->bytes += pd->tot_len;
|
|
if (a != NULL) {
|
|
a->packets++;
|
|
a->bytes += pd->tot_len;
|
|
}
|
|
REASON_SET(&reason, PFRES_MATCH);
|
|
|
|
if (r->log) {
|
|
if (rewrite)
|
|
m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
|
|
PFLOG_PACKET(ifp, h, m, af, direction, reason, r, a, ruleset);
|
|
}
|
|
|
|
if ((r->action == PF_DROP) &&
|
|
((r->rule_flag & PFRULE_RETURNICMP) ||
|
|
(r->rule_flag & PFRULE_RETURN))) {
|
|
/* undo NAT changes, if they have taken place */
|
|
if (nat != NULL) {
|
|
pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
|
|
&uh->uh_sum, &baddr, bport, 1, af);
|
|
rewrite++;
|
|
} else if (rdr != NULL) {
|
|
pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
|
|
&uh->uh_sum, &baddr, bport, 1, af);
|
|
rewrite++;
|
|
}
|
|
if ((af == AF_INET) && r->return_icmp)
|
|
pf_send_icmp(m, r->return_icmp >> 8,
|
|
r->return_icmp & 255, af, r);
|
|
else if ((af == AF_INET6) && r->return_icmp6)
|
|
pf_send_icmp(m, r->return_icmp6 >> 8,
|
|
r->return_icmp6 & 255, af, r);
|
|
}
|
|
|
|
if (r->action == PF_DROP)
|
|
return (PF_DROP);
|
|
|
|
if (pf_tag_packet(m, pftag, tag)) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
if (r->keep_state || nat != NULL || rdr != NULL) {
|
|
/* create new state */
|
|
struct pf_state *s = NULL;
|
|
|
|
if (!r->max_states || r->states < r->max_states)
|
|
s = pool_get(&pf_state_pl, PR_NOWAIT);
|
|
if (s == NULL) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
return (PF_DROP);
|
|
}
|
|
bzero(s, sizeof(*s));
|
|
r->states++;
|
|
if (a != NULL)
|
|
a->states++;
|
|
s->rule.ptr = r;
|
|
if (nat != NULL)
|
|
s->nat_rule.ptr = nat;
|
|
else
|
|
s->nat_rule.ptr = rdr;
|
|
if (s->nat_rule.ptr != NULL)
|
|
s->nat_rule.ptr->states++;
|
|
s->anchor.ptr = a;
|
|
s->allow_opts = r->allow_opts;
|
|
s->log = r->log & 2;
|
|
s->proto = IPPROTO_UDP;
|
|
s->direction = direction;
|
|
s->af = af;
|
|
if (direction == PF_OUT) {
|
|
PF_ACPY(&s->gwy.addr, saddr, af);
|
|
s->gwy.port = uh->uh_sport;
|
|
PF_ACPY(&s->ext.addr, daddr, af);
|
|
s->ext.port = uh->uh_dport;
|
|
if (nat != NULL) {
|
|
PF_ACPY(&s->lan.addr, &baddr, af);
|
|
s->lan.port = bport;
|
|
} else {
|
|
PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
|
|
s->lan.port = s->gwy.port;
|
|
}
|
|
} else {
|
|
PF_ACPY(&s->lan.addr, daddr, af);
|
|
s->lan.port = uh->uh_dport;
|
|
PF_ACPY(&s->ext.addr, saddr, af);
|
|
s->ext.port = uh->uh_sport;
|
|
if (rdr != NULL) {
|
|
PF_ACPY(&s->gwy.addr, &baddr, af);
|
|
s->gwy.port = bport;
|
|
} else {
|
|
PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
|
|
s->gwy.port = s->lan.port;
|
|
}
|
|
}
|
|
s->src.state = PFUDPS_SINGLE;
|
|
s->dst.state = PFUDPS_NO_TRAFFIC;
|
|
#if defined(__FreeBSD__)
|
|
s->creation = time_second;
|
|
s->expire = time_second;
|
|
#else
|
|
s->creation = time.tv_sec;
|
|
s->expire = time.tv_sec;
|
|
#endif
|
|
s->timeout = PFTM_UDP_FIRST_PACKET;
|
|
s->packets[0] = 1;
|
|
s->bytes[0] = pd->tot_len;
|
|
pf_set_rt_ifp(s, saddr);
|
|
if (pf_insert_state(s)) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
pool_put(&pf_state_pl, s);
|
|
return (PF_DROP);
|
|
} else
|
|
*sm = s;
|
|
}
|
|
|
|
/* copy back packet headers if we performed NAT operations */
|
|
if (rewrite)
|
|
m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
|
|
|
|
return (PF_PASS);
|
|
}
|
|
|
|
int
|
|
pf_test_icmp(struct pf_rule **rm, struct pf_state **sm, int direction,
|
|
struct ifnet *ifp, struct mbuf *m, int ipoff, int off, void *h,
|
|
struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm)
|
|
{
|
|
struct pf_rule *nat = NULL, *rdr = NULL;
|
|
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
|
|
struct pf_addr baddr, naddr;
|
|
struct pf_rule *r, *a = NULL;
|
|
struct pf_ruleset *ruleset = NULL;
|
|
u_short reason;
|
|
u_int16_t icmpid;
|
|
sa_family_t af = pd->af;
|
|
u_int8_t icmptype, icmpcode;
|
|
int state_icmp = 0;
|
|
struct pf_tag *pftag = NULL;
|
|
int tag = -1;
|
|
#ifdef INET6
|
|
int rewrite = 0;
|
|
#endif /* INET6 */
|
|
|
|
switch (pd->proto) {
|
|
#ifdef INET
|
|
case IPPROTO_ICMP:
|
|
icmptype = pd->hdr.icmp->icmp_type;
|
|
icmpcode = pd->hdr.icmp->icmp_code;
|
|
icmpid = pd->hdr.icmp->icmp_id;
|
|
|
|
if (icmptype == ICMP_UNREACH ||
|
|
icmptype == ICMP_SOURCEQUENCH ||
|
|
icmptype == ICMP_REDIRECT ||
|
|
icmptype == ICMP_TIMXCEED ||
|
|
icmptype == ICMP_PARAMPROB)
|
|
state_icmp++;
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6:
|
|
icmptype = pd->hdr.icmp6->icmp6_type;
|
|
icmpcode = pd->hdr.icmp6->icmp6_code;
|
|
icmpid = pd->hdr.icmp6->icmp6_id;
|
|
|
|
if (icmptype == ICMP6_DST_UNREACH ||
|
|
icmptype == ICMP6_PACKET_TOO_BIG ||
|
|
icmptype == ICMP6_TIME_EXCEEDED ||
|
|
icmptype == ICMP6_PARAM_PROB)
|
|
state_icmp++;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
|
|
|
|
if (direction == PF_OUT) {
|
|
/* check outgoing packet for BINAT/NAT */
|
|
if ((nat = pf_get_translation(pd, m, off, PF_OUT, ifp, saddr, 0,
|
|
daddr, 0, &naddr, NULL)) != NULL) {
|
|
PF_ACPY(&baddr, saddr, af);
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
|
|
naddr.v4.s_addr, 0);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
|
|
&naddr, 0);
|
|
rewrite++;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
if (nat->natpass)
|
|
r = NULL;
|
|
}
|
|
} else {
|
|
/* check incoming packet for BINAT/RDR */
|
|
if ((rdr = pf_get_translation(pd, m, off, PF_IN, ifp, saddr, 0,
|
|
daddr, 0, &naddr, NULL)) != NULL) {
|
|
PF_ACPY(&baddr, daddr, af);
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
pf_change_a(&daddr->v4.s_addr,
|
|
pd->ip_sum, naddr.v4.s_addr, 0);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
|
|
&naddr, 0);
|
|
rewrite++;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
if (rdr->natpass)
|
|
r = NULL;
|
|
}
|
|
}
|
|
|
|
while (r != NULL) {
|
|
r->evaluations++;
|
|
if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) ||
|
|
(r->ifp == ifp && r->ifnot)))
|
|
r = r->skip[PF_SKIP_IFP].ptr;
|
|
else if (r->direction && r->direction != direction)
|
|
r = r->skip[PF_SKIP_DIR].ptr;
|
|
else if (r->af && r->af != af)
|
|
r = r->skip[PF_SKIP_AF].ptr;
|
|
else if (r->proto && r->proto != pd->proto)
|
|
r = r->skip[PF_SKIP_PROTO].ptr;
|
|
else if (PF_MISMATCHAW(&r->src.addr, saddr, af, r->src.not))
|
|
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
|
|
else if (PF_MISMATCHAW(&r->dst.addr, daddr, af, r->dst.not))
|
|
r = r->skip[PF_SKIP_DST_ADDR].ptr;
|
|
else if (r->type && r->type != icmptype + 1)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->code && r->code != icmpcode + 1)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->tos && !(r->tos & pd->tos))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->rule_flag & PFRULE_FRAGMENT)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->match_tag &&
|
|
!pf_match_tag(m, r, nat, rdr, pftag, &tag))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->anchorname[0] && r->anchor == NULL)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->os_fingerprint != PF_OSFP_ANY)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else {
|
|
if (r->tag)
|
|
tag = r->tag;
|
|
if (r->anchor == NULL) {
|
|
*rm = r;
|
|
*am = a;
|
|
*rsm = ruleset;
|
|
if ((*rm)->quick)
|
|
break;
|
|
r = TAILQ_NEXT(r, entries);
|
|
} else
|
|
PF_STEP_INTO_ANCHOR(r, a, ruleset,
|
|
PF_RULESET_FILTER);
|
|
}
|
|
if (r == NULL && a != NULL)
|
|
PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
|
|
PF_RULESET_FILTER);
|
|
}
|
|
r = *rm;
|
|
a = *am;
|
|
ruleset = *rsm;
|
|
|
|
r->packets++;
|
|
r->bytes += pd->tot_len;
|
|
if (a != NULL) {
|
|
a->packets++;
|
|
a->bytes += pd->tot_len;
|
|
}
|
|
REASON_SET(&reason, PFRES_MATCH);
|
|
|
|
if (r->log) {
|
|
#ifdef INET6
|
|
if (rewrite)
|
|
m_copyback(m, off, sizeof(struct icmp6_hdr),
|
|
(caddr_t)pd->hdr.icmp6);
|
|
#endif /* INET6 */
|
|
PFLOG_PACKET(ifp, h, m, af, direction, reason, r, a, ruleset);
|
|
}
|
|
|
|
if (r->action != PF_PASS)
|
|
return (PF_DROP);
|
|
|
|
if (pf_tag_packet(m, pftag, tag)) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
if (!state_icmp && (r->keep_state ||
|
|
nat != NULL || rdr != NULL)) {
|
|
/* create new state */
|
|
struct pf_state *s = NULL;
|
|
|
|
if (!r->max_states || r->states < r->max_states)
|
|
s = pool_get(&pf_state_pl, PR_NOWAIT);
|
|
if (s == NULL) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
return (PF_DROP);
|
|
}
|
|
bzero(s, sizeof(*s));
|
|
r->states++;
|
|
if (a != NULL)
|
|
a->states++;
|
|
s->rule.ptr = r;
|
|
if (nat != NULL)
|
|
s->nat_rule.ptr = nat;
|
|
else
|
|
s->nat_rule.ptr = rdr;
|
|
if (s->nat_rule.ptr != NULL)
|
|
s->nat_rule.ptr->states++;
|
|
s->anchor.ptr = a;
|
|
s->allow_opts = r->allow_opts;
|
|
s->log = r->log & 2;
|
|
s->proto = pd->proto;
|
|
s->direction = direction;
|
|
s->af = af;
|
|
if (direction == PF_OUT) {
|
|
PF_ACPY(&s->gwy.addr, saddr, af);
|
|
s->gwy.port = icmpid;
|
|
PF_ACPY(&s->ext.addr, daddr, af);
|
|
s->ext.port = icmpid;
|
|
if (nat != NULL)
|
|
PF_ACPY(&s->lan.addr, &baddr, af);
|
|
else
|
|
PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
|
|
s->lan.port = icmpid;
|
|
} else {
|
|
PF_ACPY(&s->lan.addr, daddr, af);
|
|
s->lan.port = icmpid;
|
|
PF_ACPY(&s->ext.addr, saddr, af);
|
|
s->ext.port = icmpid;
|
|
if (rdr != NULL)
|
|
PF_ACPY(&s->gwy.addr, &baddr, af);
|
|
else
|
|
PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
|
|
s->gwy.port = icmpid;
|
|
}
|
|
|
|
#if defined(__FreeBSD__)
|
|
s->creation = time_second;
|
|
s->expire = time_second;
|
|
#else
|
|
s->creation = time.tv_sec;
|
|
s->expire = time.tv_sec;
|
|
#endif
|
|
s->timeout = PFTM_ICMP_FIRST_PACKET;
|
|
s->packets[0] = 1;
|
|
s->bytes[0] = pd->tot_len;
|
|
pf_set_rt_ifp(s, saddr);
|
|
if (pf_insert_state(s)) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
pool_put(&pf_state_pl, s);
|
|
return (PF_DROP);
|
|
} else
|
|
*sm = s;
|
|
}
|
|
|
|
#ifdef INET6
|
|
/* copy back packet headers if we performed IPv6 NAT operations */
|
|
if (rewrite)
|
|
m_copyback(m, off, sizeof(struct icmp6_hdr),
|
|
(caddr_t)pd->hdr.icmp6);
|
|
#endif /* INET6 */
|
|
|
|
return (PF_PASS);
|
|
}
|
|
|
|
int
|
|
pf_test_other(struct pf_rule **rm, struct pf_state **sm, int direction,
|
|
struct ifnet *ifp, struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
|
|
struct pf_rule **am, struct pf_ruleset **rsm)
|
|
{
|
|
struct pf_rule *nat = NULL, *rdr = NULL;
|
|
struct pf_rule *r, *a = NULL;
|
|
struct pf_ruleset *ruleset = NULL;
|
|
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
|
|
struct pf_addr baddr, naddr;
|
|
sa_family_t af = pd->af;
|
|
u_short reason;
|
|
struct pf_tag *pftag = NULL;
|
|
int tag = -1;
|
|
|
|
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
|
|
|
|
if (direction == PF_OUT) {
|
|
/* check outgoing packet for BINAT/NAT */
|
|
if ((nat = pf_get_translation(pd, m, off, PF_OUT, ifp, saddr, 0,
|
|
daddr, 0, &naddr, NULL)) != NULL) {
|
|
PF_ACPY(&baddr, saddr, af);
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
|
|
naddr.v4.s_addr, 0);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
PF_ACPY(saddr, &naddr, af);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
if (nat->natpass)
|
|
r = NULL;
|
|
}
|
|
} else {
|
|
/* check incoming packet for BINAT/RDR */
|
|
if ((rdr = pf_get_translation(pd, m, off, PF_IN, ifp, saddr, 0,
|
|
daddr, 0, &naddr, NULL)) != NULL) {
|
|
PF_ACPY(&baddr, daddr, af);
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
pf_change_a(&daddr->v4.s_addr,
|
|
pd->ip_sum, naddr.v4.s_addr, 0);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
PF_ACPY(daddr, &naddr, af);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
if (rdr->natpass)
|
|
r = NULL;
|
|
}
|
|
}
|
|
|
|
while (r != NULL) {
|
|
r->evaluations++;
|
|
if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) ||
|
|
(r->ifp == ifp && r->ifnot)))
|
|
r = r->skip[PF_SKIP_IFP].ptr;
|
|
else if (r->direction && r->direction != direction)
|
|
r = r->skip[PF_SKIP_DIR].ptr;
|
|
else if (r->af && r->af != af)
|
|
r = r->skip[PF_SKIP_AF].ptr;
|
|
else if (r->proto && r->proto != pd->proto)
|
|
r = r->skip[PF_SKIP_PROTO].ptr;
|
|
else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
|
|
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
|
|
else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
|
|
r = r->skip[PF_SKIP_DST_ADDR].ptr;
|
|
else if (r->tos && !(r->tos & pd->tos))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->rule_flag & PFRULE_FRAGMENT)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->match_tag &&
|
|
!pf_match_tag(m, r, nat, rdr, pftag, &tag))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->anchorname[0] && r->anchor == NULL)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->os_fingerprint != PF_OSFP_ANY)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else {
|
|
if (r->tag)
|
|
tag = r->tag;
|
|
if (r->anchor == NULL) {
|
|
*rm = r;
|
|
*am = a;
|
|
*rsm = ruleset;
|
|
if ((*rm)->quick)
|
|
break;
|
|
r = TAILQ_NEXT(r, entries);
|
|
} else
|
|
PF_STEP_INTO_ANCHOR(r, a, ruleset,
|
|
PF_RULESET_FILTER);
|
|
}
|
|
if (r == NULL && a != NULL)
|
|
PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
|
|
PF_RULESET_FILTER);
|
|
}
|
|
r = *rm;
|
|
a = *am;
|
|
ruleset = *rsm;
|
|
|
|
r->packets++;
|
|
r->bytes += pd->tot_len;
|
|
if (a != NULL) {
|
|
a->packets++;
|
|
a->bytes += pd->tot_len;
|
|
}
|
|
REASON_SET(&reason, PFRES_MATCH);
|
|
if (r->log)
|
|
PFLOG_PACKET(ifp, h, m, af, direction, reason, r, a, ruleset);
|
|
|
|
if ((r->action == PF_DROP) &&
|
|
((r->rule_flag & PFRULE_RETURNICMP) ||
|
|
(r->rule_flag & PFRULE_RETURN))) {
|
|
struct pf_addr *a = NULL;
|
|
|
|
if (nat != NULL)
|
|
a = saddr;
|
|
else if (rdr != NULL)
|
|
a = daddr;
|
|
if (a != NULL) {
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
pf_change_a(&a->v4.s_addr, pd->ip_sum,
|
|
baddr.v4.s_addr, 0);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
PF_ACPY(a, &baddr, af);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
if ((af == AF_INET) && r->return_icmp)
|
|
pf_send_icmp(m, r->return_icmp >> 8,
|
|
r->return_icmp & 255, af, r);
|
|
else if ((af == AF_INET6) && r->return_icmp6)
|
|
pf_send_icmp(m, r->return_icmp6 >> 8,
|
|
r->return_icmp6 & 255, af, r);
|
|
}
|
|
|
|
if (r->action != PF_PASS)
|
|
return (PF_DROP);
|
|
|
|
if (pf_tag_packet(m, pftag, tag)) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
if (r->keep_state || nat != NULL || rdr != NULL) {
|
|
/* create new state */
|
|
struct pf_state *s = NULL;
|
|
|
|
if (!r->max_states || r->states < r->max_states)
|
|
s = pool_get(&pf_state_pl, PR_NOWAIT);
|
|
if (s == NULL) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
return (PF_DROP);
|
|
}
|
|
bzero(s, sizeof(*s));
|
|
r->states++;
|
|
if (a != NULL)
|
|
a->states++;
|
|
s->rule.ptr = r;
|
|
if (nat != NULL)
|
|
s->nat_rule.ptr = nat;
|
|
else
|
|
s->nat_rule.ptr = rdr;
|
|
if (s->nat_rule.ptr != NULL)
|
|
s->nat_rule.ptr->states++;
|
|
s->anchor.ptr = a;
|
|
s->allow_opts = r->allow_opts;
|
|
s->log = r->log & 2;
|
|
s->proto = pd->proto;
|
|
s->direction = direction;
|
|
s->af = af;
|
|
if (direction == PF_OUT) {
|
|
PF_ACPY(&s->gwy.addr, saddr, af);
|
|
PF_ACPY(&s->ext.addr, daddr, af);
|
|
if (nat != NULL)
|
|
PF_ACPY(&s->lan.addr, &baddr, af);
|
|
else
|
|
PF_ACPY(&s->lan.addr, &s->gwy.addr, af);
|
|
} else {
|
|
PF_ACPY(&s->lan.addr, daddr, af);
|
|
PF_ACPY(&s->ext.addr, saddr, af);
|
|
if (rdr != NULL)
|
|
PF_ACPY(&s->gwy.addr, &baddr, af);
|
|
else
|
|
PF_ACPY(&s->gwy.addr, &s->lan.addr, af);
|
|
}
|
|
s->src.state = PFOTHERS_SINGLE;
|
|
s->dst.state = PFOTHERS_NO_TRAFFIC;
|
|
#if defined(__FreeBSD__)
|
|
s->creation = time_second;
|
|
s->expire = time_second;
|
|
#else
|
|
s->creation = time.tv_sec;
|
|
s->expire = time.tv_sec;
|
|
#endif
|
|
s->timeout = PFTM_OTHER_FIRST_PACKET;
|
|
s->packets[0] = 1;
|
|
s->bytes[0] = pd->tot_len;
|
|
pf_set_rt_ifp(s, saddr);
|
|
if (pf_insert_state(s)) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
if (r->log)
|
|
PFLOG_PACKET(ifp, h, m, af, direction, reason,
|
|
r, a, ruleset);
|
|
pool_put(&pf_state_pl, s);
|
|
return (PF_DROP);
|
|
} else
|
|
*sm = s;
|
|
}
|
|
|
|
return (PF_PASS);
|
|
}
|
|
|
|
int
|
|
pf_test_fragment(struct pf_rule **rm, int direction, struct ifnet *ifp,
|
|
struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
|
|
struct pf_ruleset **rsm)
|
|
{
|
|
struct pf_rule *r, *a = NULL;
|
|
struct pf_ruleset *ruleset = NULL;
|
|
sa_family_t af = pd->af;
|
|
u_short reason;
|
|
struct pf_tag *pftag = NULL;
|
|
int tag = -1;
|
|
|
|
r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
|
|
while (r != NULL) {
|
|
r->evaluations++;
|
|
if (r->ifp != NULL && ((r->ifp != ifp && !r->ifnot) ||
|
|
(r->ifp == ifp && r->ifnot)))
|
|
r = r->skip[PF_SKIP_IFP].ptr;
|
|
else if (r->direction && r->direction != direction)
|
|
r = r->skip[PF_SKIP_DIR].ptr;
|
|
else if (r->af && r->af != af)
|
|
r = r->skip[PF_SKIP_AF].ptr;
|
|
else if (r->proto && r->proto != pd->proto)
|
|
r = r->skip[PF_SKIP_PROTO].ptr;
|
|
else if (PF_MISMATCHAW(&r->src.addr, pd->src, af, r->src.not))
|
|
r = r->skip[PF_SKIP_SRC_ADDR].ptr;
|
|
else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af, r->dst.not))
|
|
r = r->skip[PF_SKIP_DST_ADDR].ptr;
|
|
else if (r->tos && !(r->tos & pd->tos))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->src.port_op || r->dst.port_op ||
|
|
r->flagset || r->type || r->code ||
|
|
r->os_fingerprint != PF_OSFP_ANY)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->match_tag &&
|
|
!pf_match_tag(m, r, NULL, NULL, pftag, &tag))
|
|
r = TAILQ_NEXT(r, entries);
|
|
else if (r->anchorname[0] && r->anchor == NULL)
|
|
r = TAILQ_NEXT(r, entries);
|
|
else {
|
|
if (r->anchor == NULL) {
|
|
*rm = r;
|
|
*am = a;
|
|
*rsm = ruleset;
|
|
if ((*rm)->quick)
|
|
break;
|
|
r = TAILQ_NEXT(r, entries);
|
|
} else
|
|
PF_STEP_INTO_ANCHOR(r, a, ruleset,
|
|
PF_RULESET_FILTER);
|
|
}
|
|
if (r == NULL && a != NULL)
|
|
PF_STEP_OUT_OF_ANCHOR(r, a, ruleset,
|
|
PF_RULESET_FILTER);
|
|
}
|
|
r = *rm;
|
|
a = *am;
|
|
ruleset = *rsm;
|
|
|
|
r->packets++;
|
|
r->bytes += pd->tot_len;
|
|
if (a != NULL) {
|
|
a->packets++;
|
|
a->bytes += pd->tot_len;
|
|
}
|
|
REASON_SET(&reason, PFRES_MATCH);
|
|
if (r->log)
|
|
PFLOG_PACKET(ifp, h, m, af, direction, reason, r, a, ruleset);
|
|
|
|
if (r->action != PF_PASS)
|
|
return (PF_DROP);
|
|
|
|
if (pf_tag_packet(m, pftag, tag)) {
|
|
REASON_SET(&reason, PFRES_MEMORY);
|
|
return (PF_DROP);
|
|
}
|
|
|
|
return (PF_PASS);
|
|
}
|
|
|
|
int
|
|
pf_test_state_tcp(struct pf_state **state, int direction, struct ifnet *ifp,
|
|
struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd,
|
|
u_short *reason)
|
|
{
|
|
struct pf_tree_node key;
|
|
struct tcphdr *th = pd->hdr.tcp;
|
|
u_int16_t win = ntohs(th->th_win);
|
|
u_int32_t ack, end, seq;
|
|
u_int8_t sws, dws;
|
|
int ackskew, dirndx;
|
|
int copyback = 0;
|
|
struct pf_state_peer *src, *dst;
|
|
|
|
key.af = pd->af;
|
|
key.proto = IPPROTO_TCP;
|
|
PF_ACPY(&key.addr[0], pd->src, key.af);
|
|
PF_ACPY(&key.addr[1], pd->dst, key.af);
|
|
key.port[0] = th->th_sport;
|
|
key.port[1] = th->th_dport;
|
|
|
|
STATE_LOOKUP();
|
|
|
|
if (direction == (*state)->direction) {
|
|
src = &(*state)->src;
|
|
dst = &(*state)->dst;
|
|
dirndx = 0;
|
|
} else {
|
|
src = &(*state)->dst;
|
|
dst = &(*state)->src;
|
|
dirndx = 1;
|
|
}
|
|
|
|
if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
|
|
if (direction != (*state)->direction)
|
|
return (PF_SYNPROXY_DROP);
|
|
if (th->th_flags & TH_SYN) {
|
|
if (ntohl(th->th_seq) != (*state)->src.seqlo)
|
|
return (PF_DROP);
|
|
pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
|
|
pd->src, th->th_dport, th->th_sport,
|
|
(*state)->src.seqhi, ntohl(th->th_seq) + 1,
|
|
TH_SYN|TH_ACK, 0, (*state)->src.mss, 0);
|
|
return (PF_SYNPROXY_DROP);
|
|
} else if (!(th->th_flags & TH_ACK) ||
|
|
(ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
|
|
(ntohl(th->th_seq) != (*state)->src.seqlo + 1))
|
|
return (PF_DROP);
|
|
else
|
|
(*state)->src.state = PF_TCPS_PROXY_DST;
|
|
}
|
|
if ((*state)->src.state == PF_TCPS_PROXY_DST) {
|
|
struct pf_state_host *src, *dst;
|
|
|
|
if (direction == PF_OUT) {
|
|
src = &(*state)->gwy;
|
|
dst = &(*state)->ext;
|
|
} else {
|
|
src = &(*state)->ext;
|
|
dst = &(*state)->lan;
|
|
}
|
|
if (direction == (*state)->direction) {
|
|
if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
|
|
(ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
|
|
(ntohl(th->th_seq) != (*state)->src.seqlo + 1))
|
|
return (PF_DROP);
|
|
(*state)->src.max_win = MAX(ntohs(th->th_win), 1);
|
|
if ((*state)->dst.seqhi == 1)
|
|
(*state)->dst.seqhi = arc4random();
|
|
pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
|
|
&dst->addr, src->port, dst->port,
|
|
(*state)->dst.seqhi, 0, TH_SYN, 0, (*state)->src.mss, 0);
|
|
return (PF_SYNPROXY_DROP);
|
|
} else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
|
|
(TH_SYN|TH_ACK)) ||
|
|
(ntohl(th->th_ack) != (*state)->dst.seqhi + 1))
|
|
return (PF_DROP);
|
|
else {
|
|
(*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
|
|
(*state)->dst.seqlo = ntohl(th->th_seq);
|
|
pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
|
|
pd->src, th->th_dport, th->th_sport,
|
|
ntohl(th->th_ack), ntohl(th->th_seq) + 1,
|
|
TH_ACK, (*state)->src.max_win, 0, 0);
|
|
pf_send_tcp((*state)->rule.ptr, pd->af, &src->addr,
|
|
&dst->addr, src->port, dst->port,
|
|
(*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
|
|
TH_ACK, (*state)->dst.max_win, 0, 0);
|
|
(*state)->src.seqdiff = (*state)->dst.seqhi -
|
|
(*state)->src.seqlo;
|
|
(*state)->dst.seqdiff = (*state)->src.seqhi -
|
|
(*state)->dst.seqlo;
|
|
(*state)->src.seqhi = (*state)->src.seqlo +
|
|
(*state)->src.max_win;
|
|
(*state)->dst.seqhi = (*state)->dst.seqlo +
|
|
(*state)->dst.max_win;
|
|
(*state)->src.wscale = (*state)->dst.wscale = 0;
|
|
(*state)->src.state = (*state)->dst.state =
|
|
TCPS_ESTABLISHED;
|
|
return (PF_SYNPROXY_DROP);
|
|
}
|
|
}
|
|
|
|
if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
|
|
sws = src->wscale & PF_WSCALE_MASK;
|
|
dws = dst->wscale & PF_WSCALE_MASK;
|
|
} else
|
|
sws = dws = 0;
|
|
|
|
/*
|
|
* Sequence tracking algorithm from Guido van Rooij's paper:
|
|
* http://www.madison-gurkha.com/publications/tcp_filtering/
|
|
* tcp_filtering.ps
|
|
*/
|
|
|
|
seq = ntohl(th->th_seq);
|
|
if (src->seqlo == 0) {
|
|
/* First packet from this end. Set its state */
|
|
|
|
if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
|
|
src->scrub == NULL) {
|
|
if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
|
|
REASON_SET(reason, PFRES_MEMORY);
|
|
return (PF_DROP);
|
|
}
|
|
}
|
|
|
|
/* Deferred generation of sequence number modulator */
|
|
if (dst->seqdiff && !src->seqdiff) {
|
|
while ((src->seqdiff = arc4random()) == 0)
|
|
;
|
|
ack = ntohl(th->th_ack) - dst->seqdiff;
|
|
pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
|
|
src->seqdiff), 0);
|
|
pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
|
|
copyback = 1;
|
|
} else {
|
|
ack = ntohl(th->th_ack);
|
|
}
|
|
|
|
end = seq + pd->p_len;
|
|
if (th->th_flags & TH_SYN) {
|
|
end++;
|
|
if (dst->wscale & PF_WSCALE_FLAG) {
|
|
src->wscale = pf_get_wscale(m, off, th->th_off,
|
|
pd->af);
|
|
if (src->wscale & PF_WSCALE_FLAG) {
|
|
/* Remove scale factor from initial
|
|
* window */
|
|
sws = src->wscale & PF_WSCALE_MASK;
|
|
win = ((u_int32_t)win + (1 << sws) - 1)
|
|
>> sws;
|
|
dws = dst->wscale & PF_WSCALE_MASK;
|
|
} else {
|
|
/* fixup other window */
|
|
dst->max_win <<= dst->wscale &
|
|
PF_WSCALE_MASK;
|
|
/* in case of a retrans SYN|ACK */
|
|
dst->wscale = 0;
|
|
}
|
|
}
|
|
}
|
|
if (th->th_flags & TH_FIN)
|
|
end++;
|
|
|
|
src->seqlo = seq;
|
|
if (src->state < TCPS_SYN_SENT)
|
|
src->state = TCPS_SYN_SENT;
|
|
|
|
/*
|
|
* May need to slide the window (seqhi may have been set by
|
|
* the crappy stack check or if we picked up the connection
|
|
* after establishment)
|
|
*/
|
|
if (src->seqhi == 1 ||
|
|
SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
|
|
src->seqhi = end + MAX(1, dst->max_win << dws);
|
|
if (win > src->max_win)
|
|
src->max_win = win;
|
|
|
|
} else {
|
|
ack = ntohl(th->th_ack) - dst->seqdiff;
|
|
if (src->seqdiff) {
|
|
/* Modulate sequence numbers */
|
|
pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
|
|
src->seqdiff), 0);
|
|
pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
|
|
copyback = 1;
|
|
}
|
|
end = seq + pd->p_len;
|
|
if (th->th_flags & TH_SYN)
|
|
end++;
|
|
if (th->th_flags & TH_FIN)
|
|
end++;
|
|
}
|
|
|
|
if ((th->th_flags & TH_ACK) == 0) {
|
|
/* Let it pass through the ack skew check */
|
|
ack = dst->seqlo;
|
|
} else if ((ack == 0 &&
|
|
(th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
|
|
/* broken tcp stacks do not set ack */
|
|
(dst->state < TCPS_SYN_SENT)) {
|
|
/*
|
|
* Many stacks (ours included) will set the ACK number in an
|
|
* FIN|ACK if the SYN times out -- no sequence to ACK.
|
|
*/
|
|
ack = dst->seqlo;
|
|
}
|
|
|
|
if (seq == end) {
|
|
/* Ease sequencing restrictions on no data packets */
|
|
seq = src->seqlo;
|
|
end = seq;
|
|
}
|
|
|
|
ackskew = dst->seqlo - ack;
|
|
|
|
#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */
|
|
if (SEQ_GEQ(src->seqhi, end) &&
|
|
/* Last octet inside other's window space */
|
|
SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
|
|
/* Retrans: not more than one window back */
|
|
(ackskew >= -MAXACKWINDOW) &&
|
|
/* Acking not more than one reassembled fragment backwards */
|
|
(ackskew <= (MAXACKWINDOW << sws))) {
|
|
/* Acking not more than one window forward */
|
|
|
|
(*state)->packets[dirndx]++;
|
|
(*state)->bytes[dirndx] += pd->tot_len;
|
|
|
|
/* update max window */
|
|
if (src->max_win < win)
|
|
src->max_win = win;
|
|
/* synchronize sequencing */
|
|
if (SEQ_GT(end, src->seqlo))
|
|
src->seqlo = end;
|
|
/* slide the window of what the other end can send */
|
|
if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
|
|
dst->seqhi = ack + MAX((win << sws), 1);
|
|
|
|
|
|
/* update states */
|
|
if (th->th_flags & TH_SYN)
|
|
if (src->state < TCPS_SYN_SENT)
|
|
src->state = TCPS_SYN_SENT;
|
|
if (th->th_flags & TH_FIN)
|
|
if (src->state < TCPS_CLOSING)
|
|
src->state = TCPS_CLOSING;
|
|
if (th->th_flags & TH_ACK) {
|
|
if (dst->state == TCPS_SYN_SENT)
|
|
dst->state = TCPS_ESTABLISHED;
|
|
else if (dst->state == TCPS_CLOSING)
|
|
dst->state = TCPS_FIN_WAIT_2;
|
|
}
|
|
if (th->th_flags & TH_RST)
|
|
src->state = dst->state = TCPS_TIME_WAIT;
|
|
|
|
/* update expire time */
|
|
#if defined(__FreeBSD__)
|
|
(*state)->expire = time_second;
|
|
#else
|
|
(*state)->expire = time.tv_sec;
|
|
#endif
|
|
if (src->state >= TCPS_FIN_WAIT_2 &&
|
|
dst->state >= TCPS_FIN_WAIT_2)
|
|
(*state)->timeout = PFTM_TCP_CLOSED;
|
|
else if (src->state >= TCPS_FIN_WAIT_2 ||
|
|
dst->state >= TCPS_FIN_WAIT_2)
|
|
(*state)->timeout = PFTM_TCP_FIN_WAIT;
|
|
else if (src->state < TCPS_ESTABLISHED ||
|
|
dst->state < TCPS_ESTABLISHED)
|
|
(*state)->timeout = PFTM_TCP_OPENING;
|
|
else if (src->state >= TCPS_CLOSING ||
|
|
dst->state >= TCPS_CLOSING)
|
|
(*state)->timeout = PFTM_TCP_CLOSING;
|
|
else
|
|
(*state)->timeout = PFTM_TCP_ESTABLISHED;
|
|
|
|
/* Fall through to PASS packet */
|
|
|
|
} else if ((dst->state < TCPS_SYN_SENT ||
|
|
dst->state >= TCPS_FIN_WAIT_2 ||
|
|
src->state >= TCPS_FIN_WAIT_2) &&
|
|
SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
|
|
/* Within a window forward of the originating packet */
|
|
SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
|
|
/* Within a window backward of the originating packet */
|
|
|
|
/*
|
|
* This currently handles three situations:
|
|
* 1) Stupid stacks will shotgun SYNs before their peer
|
|
* replies.
|
|
* 2) When PF catches an already established stream (the
|
|
* firewall rebooted, the state table was flushed, routes
|
|
* changed...)
|
|
* 3) Packets get funky immediately after the connection
|
|
* closes (this should catch Solaris spurious ACK|FINs
|
|
* that web servers like to spew after a close)
|
|
*
|
|
* This must be a little more careful than the above code
|
|
* since packet floods will also be caught here. We don't
|
|
* update the TTL here to mitigate the damage of a packet
|
|
* flood and so the same code can handle awkward establishment
|
|
* and a loosened connection close.
|
|
* In the establishment case, a correct peer response will
|
|
* validate the connection, go through the normal state code
|
|
* and keep updating the state TTL.
|
|
*/
|
|
|
|
if (pf_status.debug >= PF_DEBUG_MISC) {
|
|
printf("pf: loose state match: ");
|
|
pf_print_state(*state);
|
|
pf_print_flags(th->th_flags);
|
|
printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d\n",
|
|
seq, ack, pd->p_len, ackskew,
|
|
(*state)->packets[0], (*state)->packets[1]);
|
|
}
|
|
|
|
(*state)->packets[dirndx]++;
|
|
(*state)->bytes[dirndx] += pd->tot_len;
|
|
|
|
/* update max window */
|
|
if (src->max_win < win)
|
|
src->max_win = win;
|
|
/* synchronize sequencing */
|
|
if (SEQ_GT(end, src->seqlo))
|
|
src->seqlo = end;
|
|
/* slide the window of what the other end can send */
|
|
if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
|
|
dst->seqhi = ack + MAX((win << sws), 1);
|
|
|
|
/*
|
|
* Cannot set dst->seqhi here since this could be a shotgunned
|
|
* SYN and not an already established connection.
|
|
*/
|
|
|
|
if (th->th_flags & TH_FIN)
|
|
if (src->state < TCPS_CLOSING)
|
|
src->state = TCPS_CLOSING;
|
|
if (th->th_flags & TH_RST)
|
|
src->state = dst->state = TCPS_TIME_WAIT;
|
|
|
|
/* Fall through to PASS packet */
|
|
|
|
} else {
|
|
if ((*state)->dst.state == TCPS_SYN_SENT &&
|
|
(*state)->src.state == TCPS_SYN_SENT) {
|
|
/* Send RST for state mismatches during handshake */
|
|
if (!(th->th_flags & TH_RST)) {
|
|
u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
|
|
|
|
if (th->th_flags & TH_SYN)
|
|
ack++;
|
|
if (th->th_flags & TH_FIN)
|
|
ack++;
|
|
pf_send_tcp((*state)->rule.ptr, pd->af,
|
|
pd->dst, pd->src, th->th_dport,
|
|
th->th_sport, ntohl(th->th_ack), ack,
|
|
TH_RST|TH_ACK, 0, 0,
|
|
(*state)->rule.ptr->return_ttl);
|
|
}
|
|
src->seqlo = 0;
|
|
src->seqhi = 1;
|
|
src->max_win = 1;
|
|
} else if (pf_status.debug >= PF_DEBUG_MISC) {
|
|
printf("pf: BAD state: ");
|
|
pf_print_state(*state);
|
|
pf_print_flags(th->th_flags);
|
|
printf(" seq=%u ack=%u len=%u ackskew=%d pkts=%d:%d "
|
|
"dir=%s,%s\n", seq, ack, pd->p_len, ackskew,
|
|
(*state)->packets[0], (*state)->packets[1],
|
|
direction == PF_IN ? "in" : "out",
|
|
direction == (*state)->direction ? "fwd" : "rev");
|
|
printf("pf: State failure on: %c %c %c %c | %c %c\n",
|
|
SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
|
|
SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
|
|
' ': '2',
|
|
(ackskew >= -MAXACKWINDOW) ? ' ' : '3',
|
|
(ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
|
|
SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
|
|
SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
|
|
}
|
|
return (PF_DROP);
|
|
}
|
|
|
|
if (dst->scrub || src->scrub) {
|
|
if (pf_normalize_tcp_stateful(m, off, pd, reason, th, src, dst,
|
|
©back))
|
|
return (PF_DROP);
|
|
}
|
|
|
|
/* Any packets which have gotten here are to be passed */
|
|
|
|
/* translate source/destination address, if necessary */
|
|
if (STATE_TRANSLATE(*state)) {
|
|
if (direction == PF_OUT)
|
|
pf_change_ap(pd->src, &th->th_sport, pd->ip_sum,
|
|
&th->th_sum, &(*state)->gwy.addr,
|
|
(*state)->gwy.port, 0, pd->af);
|
|
else
|
|
pf_change_ap(pd->dst, &th->th_dport, pd->ip_sum,
|
|
&th->th_sum, &(*state)->lan.addr,
|
|
(*state)->lan.port, 0, pd->af);
|
|
m_copyback(m, off, sizeof(*th), (caddr_t)th);
|
|
} else if (copyback) {
|
|
/* Copyback sequence modulation or stateful scrub changes */
|
|
m_copyback(m, off, sizeof(*th), (caddr_t)th);
|
|
}
|
|
|
|
(*state)->rule.ptr->packets++;
|
|
(*state)->rule.ptr->bytes += pd->tot_len;
|
|
if ((*state)->nat_rule.ptr != NULL) {
|
|
(*state)->nat_rule.ptr->packets++;
|
|
(*state)->nat_rule.ptr->bytes += pd->tot_len;
|
|
}
|
|
if ((*state)->anchor.ptr != NULL) {
|
|
(*state)->anchor.ptr->packets++;
|
|
(*state)->anchor.ptr->bytes += pd->tot_len;
|
|
}
|
|
return (PF_PASS);
|
|
}
|
|
|
|
int
|
|
pf_test_state_udp(struct pf_state **state, int direction, struct ifnet *ifp,
|
|
struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd)
|
|
{
|
|
struct pf_state_peer *src, *dst;
|
|
struct pf_tree_node key;
|
|
struct udphdr *uh = pd->hdr.udp;
|
|
int dirndx;
|
|
|
|
key.af = pd->af;
|
|
key.proto = IPPROTO_UDP;
|
|
PF_ACPY(&key.addr[0], pd->src, key.af);
|
|
PF_ACPY(&key.addr[1], pd->dst, key.af);
|
|
key.port[0] = uh->uh_sport;
|
|
key.port[1] = uh->uh_dport;
|
|
|
|
STATE_LOOKUP();
|
|
|
|
if (direction == (*state)->direction) {
|
|
src = &(*state)->src;
|
|
dst = &(*state)->dst;
|
|
dirndx = 0;
|
|
} else {
|
|
src = &(*state)->dst;
|
|
dst = &(*state)->src;
|
|
dirndx = 1;
|
|
}
|
|
|
|
(*state)->packets[dirndx]++;
|
|
(*state)->bytes[dirndx] += pd->tot_len;
|
|
|
|
/* update states */
|
|
if (src->state < PFUDPS_SINGLE)
|
|
src->state = PFUDPS_SINGLE;
|
|
if (dst->state == PFUDPS_SINGLE)
|
|
dst->state = PFUDPS_MULTIPLE;
|
|
|
|
/* update expire time */
|
|
#if defined(__FreeBSD__)
|
|
(*state)->expire = time_second;
|
|
#else
|
|
(*state)->expire = time.tv_sec;
|
|
#endif
|
|
if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
|
|
(*state)->timeout = PFTM_UDP_MULTIPLE;
|
|
else
|
|
(*state)->timeout = PFTM_UDP_SINGLE;
|
|
|
|
/* translate source/destination address, if necessary */
|
|
if (STATE_TRANSLATE(*state)) {
|
|
if (direction == PF_OUT)
|
|
pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
|
|
&uh->uh_sum, &(*state)->gwy.addr,
|
|
(*state)->gwy.port, 1, pd->af);
|
|
else
|
|
pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
|
|
&uh->uh_sum, &(*state)->lan.addr,
|
|
(*state)->lan.port, 1, pd->af);
|
|
m_copyback(m, off, sizeof(*uh), (caddr_t)uh);
|
|
}
|
|
|
|
(*state)->rule.ptr->packets++;
|
|
(*state)->rule.ptr->bytes += pd->tot_len;
|
|
if ((*state)->nat_rule.ptr != NULL) {
|
|
(*state)->nat_rule.ptr->packets++;
|
|
(*state)->nat_rule.ptr->bytes += pd->tot_len;
|
|
}
|
|
if ((*state)->anchor.ptr != NULL) {
|
|
(*state)->anchor.ptr->packets++;
|
|
(*state)->anchor.ptr->bytes += pd->tot_len;
|
|
}
|
|
return (PF_PASS);
|
|
}
|
|
|
|
int
|
|
pf_test_state_icmp(struct pf_state **state, int direction, struct ifnet *ifp,
|
|
struct mbuf *m, int ipoff, int off, void *h, struct pf_pdesc *pd)
|
|
{
|
|
struct pf_addr *saddr = pd->src, *daddr = pd->dst;
|
|
u_int16_t icmpid, *icmpsum;
|
|
u_int8_t icmptype;
|
|
int state_icmp = 0, dirndx;
|
|
|
|
switch (pd->proto) {
|
|
#ifdef INET
|
|
case IPPROTO_ICMP:
|
|
icmptype = pd->hdr.icmp->icmp_type;
|
|
icmpid = pd->hdr.icmp->icmp_id;
|
|
icmpsum = &pd->hdr.icmp->icmp_cksum;
|
|
|
|
if (icmptype == ICMP_UNREACH ||
|
|
icmptype == ICMP_SOURCEQUENCH ||
|
|
icmptype == ICMP_REDIRECT ||
|
|
icmptype == ICMP_TIMXCEED ||
|
|
icmptype == ICMP_PARAMPROB)
|
|
state_icmp++;
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6:
|
|
icmptype = pd->hdr.icmp6->icmp6_type;
|
|
icmpid = pd->hdr.icmp6->icmp6_id;
|
|
icmpsum = &pd->hdr.icmp6->icmp6_cksum;
|
|
|
|
if (icmptype == ICMP6_DST_UNREACH ||
|
|
icmptype == ICMP6_PACKET_TOO_BIG ||
|
|
icmptype == ICMP6_TIME_EXCEEDED ||
|
|
icmptype == ICMP6_PARAM_PROB)
|
|
state_icmp++;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
if (!state_icmp) {
|
|
|
|
/*
|
|
* ICMP query/reply message not related to a TCP/UDP packet.
|
|
* Search for an ICMP state.
|
|
*/
|
|
struct pf_tree_node key;
|
|
|
|
key.af = pd->af;
|
|
key.proto = pd->proto;
|
|
PF_ACPY(&key.addr[0], saddr, key.af);
|
|
PF_ACPY(&key.addr[1], daddr, key.af);
|
|
key.port[0] = icmpid;
|
|
key.port[1] = icmpid;
|
|
|
|
STATE_LOOKUP();
|
|
|
|
dirndx = (direction == (*state)->direction) ? 0 : 1;
|
|
(*state)->packets[dirndx]++;
|
|
(*state)->bytes[dirndx] += pd->tot_len;
|
|
#if defined(__FreeBSD__)
|
|
(*state)->expire = time_second;
|
|
#else
|
|
(*state)->expire = time.tv_sec;
|
|
#endif
|
|
(*state)->timeout = PFTM_ICMP_ERROR_REPLY;
|
|
|
|
/* translate source/destination address, if necessary */
|
|
if (PF_ANEQ(&(*state)->lan.addr, &(*state)->gwy.addr, pd->af)) {
|
|
if (direction == PF_OUT) {
|
|
switch (pd->af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
pf_change_a(&saddr->v4.s_addr,
|
|
pd->ip_sum,
|
|
(*state)->gwy.addr.v4.s_addr, 0);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
pf_change_a6(saddr,
|
|
&pd->hdr.icmp6->icmp6_cksum,
|
|
&(*state)->gwy.addr, 0);
|
|
m_copyback(m, off,
|
|
sizeof(struct icmp6_hdr),
|
|
(caddr_t)pd->hdr.icmp6);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
} else {
|
|
switch (pd->af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
pf_change_a(&daddr->v4.s_addr,
|
|
pd->ip_sum,
|
|
(*state)->lan.addr.v4.s_addr, 0);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
pf_change_a6(daddr,
|
|
&pd->hdr.icmp6->icmp6_cksum,
|
|
&(*state)->lan.addr, 0);
|
|
m_copyback(m, off,
|
|
sizeof(struct icmp6_hdr),
|
|
(caddr_t)pd->hdr.icmp6);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
}
|
|
|
|
return (PF_PASS);
|
|
|
|
} else {
|
|
/*
|
|
* ICMP error message in response to a TCP/UDP packet.
|
|
* Extract the inner TCP/UDP header and search for that state.
|
|
*/
|
|
|
|
struct pf_pdesc pd2;
|
|
#ifdef INET
|
|
struct ip h2;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
struct ip6_hdr h2_6;
|
|
int terminal = 0;
|
|
#endif /* INET6 */
|
|
int ipoff2;
|
|
int off2;
|
|
|
|
pd2.af = pd->af;
|
|
switch (pd->af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
/* offset of h2 in mbuf chain */
|
|
ipoff2 = off + ICMP_MINLEN;
|
|
|
|
if (!pf_pull_hdr(m, ipoff2, &h2, sizeof(h2),
|
|
NULL, NULL, pd2.af)) {
|
|
DPFPRINTF(PF_DEBUG_MISC,
|
|
("pf: ICMP error message too short "
|
|
"(ip)\n"));
|
|
return (PF_DROP);
|
|
}
|
|
/*
|
|
* ICMP error messages don't refer to non-first
|
|
* fragments
|
|
*/
|
|
if (h2.ip_off & htons(IP_OFFMASK))
|
|
return (PF_DROP);
|
|
|
|
/* offset of protocol header that follows h2 */
|
|
off2 = ipoff2 + (h2.ip_hl << 2);
|
|
|
|
pd2.proto = h2.ip_p;
|
|
pd2.src = (struct pf_addr *)&h2.ip_src;
|
|
pd2.dst = (struct pf_addr *)&h2.ip_dst;
|
|
pd2.ip_sum = &h2.ip_sum;
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
ipoff2 = off + sizeof(struct icmp6_hdr);
|
|
|
|
if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof(h2_6),
|
|
NULL, NULL, pd2.af)) {
|
|
DPFPRINTF(PF_DEBUG_MISC,
|
|
("pf: ICMP error message too short "
|
|
"(ip6)\n"));
|
|
return (PF_DROP);
|
|
}
|
|
pd2.proto = h2_6.ip6_nxt;
|
|
pd2.src = (struct pf_addr *)&h2_6.ip6_src;
|
|
pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
|
|
pd2.ip_sum = NULL;
|
|
off2 = ipoff2 + sizeof(h2_6);
|
|
do {
|
|
switch (pd2.proto) {
|
|
case IPPROTO_FRAGMENT:
|
|
/*
|
|
* ICMPv6 error messages for
|
|
* non-first fragments
|
|
*/
|
|
return (PF_DROP);
|
|
case IPPROTO_AH:
|
|
case IPPROTO_HOPOPTS:
|
|
case IPPROTO_ROUTING:
|
|
case IPPROTO_DSTOPTS: {
|
|
/* get next header and header length */
|
|
struct ip6_ext opt6;
|
|
|
|
if (!pf_pull_hdr(m, off2, &opt6,
|
|
sizeof(opt6), NULL, NULL, pd2.af)) {
|
|
DPFPRINTF(PF_DEBUG_MISC,
|
|
("pf: ICMPv6 short opt\n"));
|
|
return (PF_DROP);
|
|
}
|
|
if (pd2.proto == IPPROTO_AH)
|
|
off2 += (opt6.ip6e_len + 2) * 4;
|
|
else
|
|
off2 += (opt6.ip6e_len + 1) * 8;
|
|
pd2.proto = opt6.ip6e_nxt;
|
|
/* goto the next header */
|
|
break;
|
|
}
|
|
default:
|
|
terminal++;
|
|
break;
|
|
}
|
|
} while (!terminal);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
|
|
switch (pd2.proto) {
|
|
case IPPROTO_TCP: {
|
|
struct tcphdr th;
|
|
u_int32_t seq;
|
|
struct pf_tree_node key;
|
|
struct pf_state_peer *src, *dst;
|
|
u_int8_t dws;
|
|
|
|
/*
|
|
* Only the first 8 bytes of the TCP header can be
|
|
* expected. Don't access any TCP header fields after
|
|
* th_seq, an ackskew test is not possible.
|
|
*/
|
|
if (!pf_pull_hdr(m, off2, &th, 8, NULL, NULL, pd2.af)) {
|
|
DPFPRINTF(PF_DEBUG_MISC,
|
|
("pf: ICMP error message too short "
|
|
"(tcp)\n"));
|
|
return (PF_DROP);
|
|
}
|
|
|
|
key.af = pd2.af;
|
|
key.proto = IPPROTO_TCP;
|
|
PF_ACPY(&key.addr[0], pd2.dst, pd2.af);
|
|
key.port[0] = th.th_dport;
|
|
PF_ACPY(&key.addr[1], pd2.src, pd2.af);
|
|
key.port[1] = th.th_sport;
|
|
|
|
STATE_LOOKUP();
|
|
|
|
if (direction == (*state)->direction) {
|
|
src = &(*state)->dst;
|
|
dst = &(*state)->src;
|
|
} else {
|
|
src = &(*state)->src;
|
|
dst = &(*state)->dst;
|
|
}
|
|
|
|
if (src->wscale && dst->wscale && !(th.th_flags & TH_SYN))
|
|
dws = dst->wscale & PF_WSCALE_MASK;
|
|
else
|
|
dws = 0;
|
|
|
|
/* Demodulate sequence number */
|
|
seq = ntohl(th.th_seq) - src->seqdiff;
|
|
if (src->seqdiff)
|
|
pf_change_a(&th.th_seq, &th.th_sum,
|
|
htonl(seq), 0);
|
|
|
|
if (!SEQ_GEQ(src->seqhi, seq) ||
|
|
!SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
|
|
if (pf_status.debug >= PF_DEBUG_MISC) {
|
|
printf("pf: BAD ICMP %d:%d ",
|
|
icmptype, pd->hdr.icmp->icmp_code);
|
|
pf_print_host(pd->src, 0, pd->af);
|
|
printf(" -> ");
|
|
pf_print_host(pd->dst, 0, pd->af);
|
|
printf(" state: ");
|
|
pf_print_state(*state);
|
|
printf(" seq=%u\n", seq);
|
|
}
|
|
return (PF_DROP);
|
|
}
|
|
|
|
if (STATE_TRANSLATE(*state)) {
|
|
if (direction == PF_IN) {
|
|
pf_change_icmp(pd2.src, &th.th_sport,
|
|
saddr, &(*state)->lan.addr,
|
|
(*state)->lan.port, NULL,
|
|
pd2.ip_sum, icmpsum,
|
|
pd->ip_sum, 0, pd2.af);
|
|
} else {
|
|
pf_change_icmp(pd2.dst, &th.th_dport,
|
|
saddr, &(*state)->gwy.addr,
|
|
(*state)->gwy.port, NULL,
|
|
pd2.ip_sum, icmpsum,
|
|
pd->ip_sum, 0, pd2.af);
|
|
}
|
|
switch (pd2.af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
m_copyback(m, off, ICMP_MINLEN,
|
|
(caddr_t)pd->hdr.icmp);
|
|
m_copyback(m, ipoff2, sizeof(h2),
|
|
(caddr_t)&h2);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
m_copyback(m, off,
|
|
sizeof(struct icmp6_hdr),
|
|
(caddr_t)pd->hdr.icmp6);
|
|
m_copyback(m, ipoff2, sizeof(h2_6),
|
|
(caddr_t)&h2_6);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
m_copyback(m, off2, 8, (caddr_t)&th);
|
|
} else if (src->seqdiff) {
|
|
m_copyback(m, off2, 8, (caddr_t)&th);
|
|
}
|
|
|
|
return (PF_PASS);
|
|
break;
|
|
}
|
|
case IPPROTO_UDP: {
|
|
struct udphdr uh;
|
|
struct pf_tree_node key;
|
|
|
|
if (!pf_pull_hdr(m, off2, &uh, sizeof(uh),
|
|
NULL, NULL, pd2.af)) {
|
|
DPFPRINTF(PF_DEBUG_MISC,
|
|
("pf: ICMP error message too short "
|
|
"(udp)\n"));
|
|
return (PF_DROP);
|
|
}
|
|
|
|
key.af = pd2.af;
|
|
key.proto = IPPROTO_UDP;
|
|
PF_ACPY(&key.addr[0], pd2.dst, pd2.af);
|
|
key.port[0] = uh.uh_dport;
|
|
PF_ACPY(&key.addr[1], pd2.src, pd2.af);
|
|
key.port[1] = uh.uh_sport;
|
|
|
|
STATE_LOOKUP();
|
|
|
|
if (STATE_TRANSLATE(*state)) {
|
|
if (direction == PF_IN) {
|
|
pf_change_icmp(pd2.src, &uh.uh_sport,
|
|
daddr, &(*state)->lan.addr,
|
|
(*state)->lan.port, &uh.uh_sum,
|
|
pd2.ip_sum, icmpsum,
|
|
pd->ip_sum, 1, pd2.af);
|
|
} else {
|
|
pf_change_icmp(pd2.dst, &uh.uh_dport,
|
|
saddr, &(*state)->gwy.addr,
|
|
(*state)->gwy.port, &uh.uh_sum,
|
|
pd2.ip_sum, icmpsum,
|
|
pd->ip_sum, 1, pd2.af);
|
|
}
|
|
switch (pd2.af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
m_copyback(m, off, ICMP_MINLEN,
|
|
(caddr_t)pd->hdr.icmp);
|
|
m_copyback(m, ipoff2, sizeof(h2),
|
|
(caddr_t)&h2);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
m_copyback(m, off,
|
|
sizeof(struct icmp6_hdr),
|
|
(caddr_t)pd->hdr.icmp6);
|
|
m_copyback(m, ipoff2, sizeof(h2_6),
|
|
(caddr_t)&h2_6);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
m_copyback(m, off2, sizeof(uh),
|
|
(caddr_t)&uh);
|
|
}
|
|
|
|
return (PF_PASS);
|
|
break;
|
|
}
|
|
#ifdef INET
|
|
case IPPROTO_ICMP: {
|
|
struct icmp iih;
|
|
struct pf_tree_node key;
|
|
|
|
if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
|
|
NULL, NULL, pd2.af)) {
|
|
DPFPRINTF(PF_DEBUG_MISC,
|
|
("pf: ICMP error message too short i"
|
|
"(icmp)\n"));
|
|
return (PF_DROP);
|
|
}
|
|
|
|
key.af = pd2.af;
|
|
key.proto = IPPROTO_ICMP;
|
|
PF_ACPY(&key.addr[0], pd2.dst, pd2.af);
|
|
key.port[0] = iih.icmp_id;
|
|
PF_ACPY(&key.addr[1], pd2.src, pd2.af);
|
|
key.port[1] = iih.icmp_id;
|
|
|
|
STATE_LOOKUP();
|
|
|
|
if (STATE_TRANSLATE(*state)) {
|
|
if (direction == PF_IN) {
|
|
pf_change_icmp(pd2.src, &iih.icmp_id,
|
|
daddr, &(*state)->lan.addr,
|
|
(*state)->lan.port, NULL,
|
|
pd2.ip_sum, icmpsum,
|
|
pd->ip_sum, 0, AF_INET);
|
|
} else {
|
|
pf_change_icmp(pd2.dst, &iih.icmp_id,
|
|
saddr, &(*state)->gwy.addr,
|
|
(*state)->gwy.port, NULL,
|
|
pd2.ip_sum, icmpsum,
|
|
pd->ip_sum, 0, AF_INET);
|
|
}
|
|
m_copyback(m, off, ICMP_MINLEN,
|
|
(caddr_t)pd->hdr.icmp);
|
|
m_copyback(m, ipoff2, sizeof(h2),
|
|
(caddr_t)&h2);
|
|
m_copyback(m, off2, ICMP_MINLEN,
|
|
(caddr_t)&iih);
|
|
}
|
|
|
|
return (PF_PASS);
|
|
break;
|
|
}
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6: {
|
|
struct icmp6_hdr iih;
|
|
struct pf_tree_node key;
|
|
|
|
if (!pf_pull_hdr(m, off2, &iih,
|
|
sizeof(struct icmp6_hdr), NULL, NULL, pd2.af)) {
|
|
DPFPRINTF(PF_DEBUG_MISC,
|
|
("pf: ICMP error message too short "
|
|
"(icmp6)\n"));
|
|
return (PF_DROP);
|
|
}
|
|
|
|
key.af = pd2.af;
|
|
key.proto = IPPROTO_ICMPV6;
|
|
PF_ACPY(&key.addr[0], pd2.dst, pd2.af);
|
|
key.port[0] = iih.icmp6_id;
|
|
PF_ACPY(&key.addr[1], pd2.src, pd2.af);
|
|
key.port[1] = iih.icmp6_id;
|
|
|
|
STATE_LOOKUP();
|
|
|
|
if (STATE_TRANSLATE(*state)) {
|
|
if (direction == PF_IN) {
|
|
pf_change_icmp(pd2.src, &iih.icmp6_id,
|
|
daddr, &(*state)->lan.addr,
|
|
(*state)->lan.port, NULL,
|
|
pd2.ip_sum, icmpsum,
|
|
pd->ip_sum, 0, AF_INET6);
|
|
} else {
|
|
pf_change_icmp(pd2.dst, &iih.icmp6_id,
|
|
saddr, &(*state)->gwy.addr,
|
|
(*state)->gwy.port, NULL,
|
|
pd2.ip_sum, icmpsum,
|
|
pd->ip_sum, 0, AF_INET6);
|
|
}
|
|
m_copyback(m, off, sizeof(struct icmp6_hdr),
|
|
(caddr_t)pd->hdr.icmp6);
|
|
m_copyback(m, ipoff2, sizeof(h2_6),
|
|
(caddr_t)&h2_6);
|
|
m_copyback(m, off2, sizeof(struct icmp6_hdr),
|
|
(caddr_t)&iih);
|
|
}
|
|
|
|
return (PF_PASS);
|
|
break;
|
|
}
|
|
#endif /* INET6 */
|
|
default: {
|
|
struct pf_tree_node key;
|
|
|
|
key.af = pd2.af;
|
|
key.proto = pd2.proto;
|
|
PF_ACPY(&key.addr[0], pd2.dst, pd2.af);
|
|
key.port[0] = 0;
|
|
PF_ACPY(&key.addr[1], pd2.src, pd2.af);
|
|
key.port[1] = 0;
|
|
|
|
STATE_LOOKUP();
|
|
|
|
if (STATE_TRANSLATE(*state)) {
|
|
if (direction == PF_IN) {
|
|
pf_change_icmp(pd2.src, NULL,
|
|
daddr, &(*state)->lan.addr,
|
|
0, NULL,
|
|
pd2.ip_sum, icmpsum,
|
|
pd->ip_sum, 0, pd2.af);
|
|
} else {
|
|
pf_change_icmp(pd2.dst, NULL,
|
|
saddr, &(*state)->gwy.addr,
|
|
0, NULL,
|
|
pd2.ip_sum, icmpsum,
|
|
pd->ip_sum, 0, pd2.af);
|
|
}
|
|
switch (pd2.af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
m_copyback(m, off, ICMP_MINLEN,
|
|
(caddr_t)pd->hdr.icmp);
|
|
m_copyback(m, ipoff2, sizeof(h2),
|
|
(caddr_t)&h2);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
m_copyback(m, off,
|
|
sizeof(struct icmp6_hdr),
|
|
(caddr_t)pd->hdr.icmp6);
|
|
m_copyback(m, ipoff2, sizeof(h2_6),
|
|
(caddr_t)&h2_6);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
return (PF_PASS);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
int
|
|
pf_test_state_other(struct pf_state **state, int direction, struct ifnet *ifp,
|
|
struct pf_pdesc *pd)
|
|
{
|
|
struct pf_state_peer *src, *dst;
|
|
struct pf_tree_node key;
|
|
int dirndx;
|
|
|
|
key.af = pd->af;
|
|
key.proto = pd->proto;
|
|
PF_ACPY(&key.addr[0], pd->src, key.af);
|
|
PF_ACPY(&key.addr[1], pd->dst, key.af);
|
|
key.port[0] = 0;
|
|
key.port[1] = 0;
|
|
|
|
STATE_LOOKUP();
|
|
|
|
if (direction == (*state)->direction) {
|
|
src = &(*state)->src;
|
|
dst = &(*state)->dst;
|
|
dirndx = 0;
|
|
} else {
|
|
src = &(*state)->dst;
|
|
dst = &(*state)->src;
|
|
dirndx = 1;
|
|
}
|
|
|
|
(*state)->packets[dirndx]++;
|
|
(*state)->bytes[dirndx] += pd->tot_len;
|
|
|
|
/* update states */
|
|
if (src->state < PFOTHERS_SINGLE)
|
|
src->state = PFOTHERS_SINGLE;
|
|
if (dst->state == PFOTHERS_SINGLE)
|
|
dst->state = PFOTHERS_MULTIPLE;
|
|
|
|
/* update expire time */
|
|
#if defined(__FreeBSD__)
|
|
(*state)->expire = time_second;
|
|
#else
|
|
(*state)->expire = time.tv_sec;
|
|
#endif
|
|
if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
|
|
(*state)->timeout = PFTM_OTHER_MULTIPLE;
|
|
else
|
|
(*state)->timeout = PFTM_OTHER_SINGLE;
|
|
|
|
/* translate source/destination address, if necessary */
|
|
if (STATE_TRANSLATE(*state)) {
|
|
if (direction == PF_OUT)
|
|
switch (pd->af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
pf_change_a(&pd->src->v4.s_addr,
|
|
pd->ip_sum, (*state)->gwy.addr.v4.s_addr,
|
|
0);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
PF_ACPY(pd->src, &(*state)->gwy.addr, pd->af);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
else
|
|
switch (pd->af) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
pf_change_a(&pd->dst->v4.s_addr,
|
|
pd->ip_sum, (*state)->lan.addr.v4.s_addr,
|
|
0);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
PF_ACPY(pd->dst, &(*state)->lan.addr, pd->af);
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
}
|
|
|
|
(*state)->rule.ptr->packets++;
|
|
(*state)->rule.ptr->bytes += pd->tot_len;
|
|
if ((*state)->nat_rule.ptr != NULL) {
|
|
(*state)->nat_rule.ptr->packets++;
|
|
(*state)->nat_rule.ptr->bytes += pd->tot_len;
|
|
}
|
|
if ((*state)->anchor.ptr != NULL) {
|
|
(*state)->anchor.ptr->packets++;
|
|
(*state)->anchor.ptr->bytes += pd->tot_len;
|
|
}
|
|
return (PF_PASS);
|
|
}
|
|
|
|
/*
|
|
* ipoff and off are measured from the start of the mbuf chain.
|
|
* h must be at "ipoff" on the mbuf chain.
|
|
*/
|
|
void *
|
|
pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
|
|
u_short *actionp, u_short *reasonp, sa_family_t af)
|
|
{
|
|
switch (af) {
|
|
#ifdef INET
|
|
case AF_INET: {
|
|
struct ip *h = mtod(m, struct ip *);
|
|
u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
|
|
|
|
if (fragoff) {
|
|
if (fragoff >= len)
|
|
ACTION_SET(actionp, PF_PASS);
|
|
else {
|
|
ACTION_SET(actionp, PF_DROP);
|
|
REASON_SET(reasonp, PFRES_FRAG);
|
|
}
|
|
return (NULL);
|
|
}
|
|
if (m->m_pkthdr.len < off + len || ntohs(h->ip_len) < off + len) {
|
|
ACTION_SET(actionp, PF_DROP);
|
|
REASON_SET(reasonp, PFRES_SHORT);
|
|
return (NULL);
|
|
}
|
|
break;
|
|
}
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6: {
|
|
struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
|
|
|
|
if (m->m_pkthdr.len < off + len ||
|
|
(ntohs(h->ip6_plen) + sizeof(struct ip6_hdr)) <
|
|
(unsigned)(off + len)) {
|
|
ACTION_SET(actionp, PF_DROP);
|
|
REASON_SET(reasonp, PFRES_SHORT);
|
|
return (NULL);
|
|
}
|
|
break;
|
|
}
|
|
#endif /* INET6 */
|
|
}
|
|
m_copydata(m, off, len, p);
|
|
return (p);
|
|
}
|
|
|
|
int
|
|
pf_routable(struct pf_addr *addr, sa_family_t af)
|
|
{
|
|
struct sockaddr_in *dst;
|
|
struct route ro;
|
|
int ret = 0;
|
|
|
|
bzero(&ro, sizeof(ro));
|
|
dst = satosin(&ro.ro_dst);
|
|
dst->sin_family = af;
|
|
dst->sin_len = sizeof(*dst);
|
|
dst->sin_addr = addr->v4;
|
|
#if defined(__FreeBSD__)
|
|
#ifdef RTF_PRCLONING
|
|
rtalloc_ign(&ro, (RTF_CLONING|RTF_PRCLONING));
|
|
#else /* !RTF_PRCLONING */
|
|
rtalloc_ign(&ro, RTF_CLONING);
|
|
#endif
|
|
#else /* ! __FreeBSD__ */
|
|
rtalloc_noclone(&ro, NO_CLONING);
|
|
#endif
|
|
|
|
if (ro.ro_rt != NULL) {
|
|
ret = 1;
|
|
RTFREE(ro.ro_rt);
|
|
}
|
|
|
|
return (ret);
|
|
}
|
|
|
|
#ifdef INET
|
|
|
|
#if defined(__FreeBSD__) && (__FreeBSD_version < 501105)
|
|
int
|
|
ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
|
|
u_long if_hwassist_flags, int sw_csum)
|
|
{
|
|
int error = 0;
|
|
int hlen = ip->ip_hl << 2;
|
|
int len = (mtu - hlen) & ~7; /* size of payload in each fragment */
|
|
int off;
|
|
struct mbuf *m0 = *m_frag; /* the original packet */
|
|
int firstlen;
|
|
struct mbuf **mnext;
|
|
int nfrags;
|
|
|
|
if (ip->ip_off & IP_DF) { /* Fragmentation not allowed */
|
|
ipstat.ips_cantfrag++;
|
|
return EMSGSIZE;
|
|
}
|
|
|
|
/*
|
|
* Must be able to put at least 8 bytes per fragment.
|
|
*/
|
|
if (len < 8)
|
|
return EMSGSIZE;
|
|
|
|
/*
|
|
* If the interface will not calculate checksums on
|
|
* fragmented packets, then do it here.
|
|
*/
|
|
if (m0->m_pkthdr.csum_flags & CSUM_DELAY_DATA &&
|
|
(if_hwassist_flags & CSUM_IP_FRAGS) == 0) {
|
|
in_delayed_cksum(m0);
|
|
m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
|
|
}
|
|
|
|
if (len > PAGE_SIZE) {
|
|
/*
|
|
* Fragment large datagrams such that each segment
|
|
* contains a multiple of PAGE_SIZE amount of data,
|
|
* plus headers. This enables a receiver to perform
|
|
* page-flipping zero-copy optimizations.
|
|
*
|
|
* XXX When does this help given that sender and receiver
|
|
* could have different page sizes, and also mtu could
|
|
* be less than the receiver's page size ?
|
|
*/
|
|
int newlen;
|
|
struct mbuf *m;
|
|
|
|
for (m = m0, off = 0; m && (off+m->m_len) <= mtu; m = m->m_next)
|
|
off += m->m_len;
|
|
|
|
/*
|
|
* firstlen (off - hlen) must be aligned on an
|
|
* 8-byte boundary
|
|
*/
|
|
if (off < hlen)
|
|
goto smart_frag_failure;
|
|
off = ((off - hlen) & ~7) + hlen;
|
|
newlen = (~PAGE_MASK) & mtu;
|
|
if ((newlen + sizeof (struct ip)) > mtu) {
|
|
/* we failed, go back the default */
|
|
smart_frag_failure:
|
|
newlen = len;
|
|
off = hlen + len;
|
|
}
|
|
len = newlen;
|
|
|
|
} else {
|
|
off = hlen + len;
|
|
}
|
|
|
|
firstlen = off - hlen;
|
|
mnext = &m0->m_nextpkt; /* pointer to next packet */
|
|
|
|
/*
|
|
* Loop through length of segment after first fragment,
|
|
* make new header and copy data of each part and link onto chain.
|
|
* Here, m0 is the original packet, m is the fragment being created.
|
|
* The fragments are linked off the m_nextpkt of the original
|
|
* packet, which after processing serves as the first fragment.
|
|
*/
|
|
for (nfrags = 1; off < ip->ip_len; off += len, nfrags++) {
|
|
struct ip *mhip; /* ip header on the fragment */
|
|
struct mbuf *m;
|
|
int mhlen = sizeof (struct ip);
|
|
|
|
MGETHDR(m, M_DONTWAIT, MT_HEADER);
|
|
if (m == 0) {
|
|
error = ENOBUFS;
|
|
ipstat.ips_odropped++;
|
|
goto done;
|
|
}
|
|
m->m_flags |= (m0->m_flags & M_MCAST) | M_FRAG;
|
|
/*
|
|
* In the first mbuf, leave room for the link header, then
|
|
* copy the original IP header including options. The payload
|
|
* goes into an additional mbuf chain returned by m_copy().
|
|
*/
|
|
m->m_data += max_linkhdr;
|
|
mhip = mtod(m, struct ip *);
|
|
*mhip = *ip;
|
|
if (hlen > sizeof (struct ip)) {
|
|
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
|
|
mhip->ip_v = IPVERSION;
|
|
mhip->ip_hl = mhlen >> 2;
|
|
}
|
|
m->m_len = mhlen;
|
|
/* XXX do we need to add ip->ip_off below ? */
|
|
mhip->ip_off = ((off - hlen) >> 3) + ip->ip_off;
|
|
if (off + len >= ip->ip_len) { /* last fragment */
|
|
len = ip->ip_len - off;
|
|
m->m_flags |= M_LASTFRAG;
|
|
} else
|
|
mhip->ip_off |= IP_MF;
|
|
mhip->ip_len = htons((u_short)(len + mhlen));
|
|
m->m_next = m_copy(m0, off, len);
|
|
if (m->m_next == 0) { /* copy failed */
|
|
m_free(m);
|
|
error = ENOBUFS; /* ??? */
|
|
ipstat.ips_odropped++;
|
|
goto done;
|
|
}
|
|
m->m_pkthdr.len = mhlen + len;
|
|
m->m_pkthdr.rcvif = (struct ifnet *)0;
|
|
#ifdef MAC
|
|
mac_create_fragment(m0, m);
|
|
#endif
|
|
m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags;
|
|
mhip->ip_off = htons(mhip->ip_off);
|
|
mhip->ip_sum = 0;
|
|
if (sw_csum & CSUM_DELAY_IP)
|
|
mhip->ip_sum = in_cksum(m, mhlen);
|
|
*mnext = m;
|
|
mnext = &m->m_nextpkt;
|
|
}
|
|
ipstat.ips_ofragments += nfrags;
|
|
|
|
/* set first marker for fragment chain */
|
|
m0->m_flags |= M_FIRSTFRAG | M_FRAG;
|
|
m0->m_pkthdr.csum_data = nfrags;
|
|
|
|
/*
|
|
* Update first fragment by trimming what's been copied out
|
|
* and updating header.
|
|
*/
|
|
m_adj(m0, hlen + firstlen - ip->ip_len);
|
|
m0->m_pkthdr.len = hlen + firstlen;
|
|
ip->ip_len = htons((u_short)m0->m_pkthdr.len);
|
|
ip->ip_off |= IP_MF;
|
|
ip->ip_off = htons(ip->ip_off);
|
|
ip->ip_sum = 0;
|
|
if (sw_csum & CSUM_DELAY_IP)
|
|
ip->ip_sum = in_cksum(m0, hlen);
|
|
|
|
done:
|
|
*m_frag = m0;
|
|
return error;
|
|
}
|
|
#endif /* __FreeBSD__ && __FreeBSD_version > 501105 */
|
|
|
|
void
|
|
pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
|
|
struct pf_state *s)
|
|
{
|
|
struct mbuf *m0, *m1;
|
|
struct route iproute;
|
|
struct route *ro;
|
|
struct sockaddr_in *dst;
|
|
struct ip *ip;
|
|
struct ifnet *ifp = NULL;
|
|
struct m_tag *mtag;
|
|
struct pf_addr naddr;
|
|
int error = 0;
|
|
#if defined(__FreeBSD__)
|
|
int sw_csum;
|
|
#endif
|
|
|
|
if (m == NULL || *m == NULL || r == NULL ||
|
|
(dir != PF_IN && dir != PF_OUT) || oifp == NULL)
|
|
panic("pf_route: invalid parameters");
|
|
|
|
if (r->rt == PF_DUPTO) {
|
|
m0 = *m;
|
|
mtag = m_tag_find(m0, PACKET_TAG_PF_ROUTED, NULL);
|
|
if (mtag == NULL) {
|
|
mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 0, M_NOWAIT);
|
|
if (mtag == NULL)
|
|
goto bad;
|
|
m_tag_prepend(m0, mtag);
|
|
}
|
|
#if defined(__FreeBSD__)
|
|
m0 = m_dup(*m, M_DONTWAIT);
|
|
#else
|
|
m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT);
|
|
#endif
|
|
if (m0 == NULL)
|
|
return;
|
|
} else {
|
|
if ((r->rt == PF_REPLYTO) == (r->direction == dir))
|
|
return;
|
|
m0 = *m;
|
|
}
|
|
|
|
if (m0->m_len < sizeof(struct ip))
|
|
panic("pf_route: m0->m_len < sizeof(struct ip)");
|
|
ip = mtod(m0, struct ip *);
|
|
|
|
ro = &iproute;
|
|
bzero((caddr_t)ro, sizeof(*ro));
|
|
dst = satosin(&ro->ro_dst);
|
|
dst->sin_family = AF_INET;
|
|
dst->sin_len = sizeof(*dst);
|
|
dst->sin_addr = ip->ip_dst;
|
|
|
|
if (r->rt == PF_FASTROUTE) {
|
|
rtalloc(ro);
|
|
if (ro->ro_rt == 0) {
|
|
ipstat.ips_noroute++;
|
|
goto bad;
|
|
}
|
|
|
|
ifp = ro->ro_rt->rt_ifp;
|
|
ro->ro_rt->rt_use++;
|
|
|
|
if (ro->ro_rt->rt_flags & RTF_GATEWAY)
|
|
dst = satosin(ro->ro_rt->rt_gateway);
|
|
} else {
|
|
if (TAILQ_EMPTY(&r->rpool.list))
|
|
panic("pf_route: TAILQ_EMPTY(&r->rpool.list)");
|
|
if (s == NULL) {
|
|
pf_map_addr(AF_INET, &r->rpool,
|
|
(struct pf_addr *)&ip->ip_src,
|
|
&naddr, NULL);
|
|
if (!PF_AZERO(&naddr, AF_INET))
|
|
dst->sin_addr.s_addr = naddr.v4.s_addr;
|
|
ifp = r->rpool.cur->ifp;
|
|
} else {
|
|
if (!PF_AZERO(&s->rt_addr, AF_INET))
|
|
dst->sin_addr.s_addr =
|
|
s->rt_addr.v4.s_addr;
|
|
ifp = s->rt_ifp;
|
|
}
|
|
}
|
|
|
|
if (ifp == NULL)
|
|
goto bad;
|
|
|
|
mtag = m_tag_find(m0, PACKET_TAG_PF_ROUTED, NULL);
|
|
if (mtag == NULL) {
|
|
struct m_tag *mtag;
|
|
|
|
mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 0, M_NOWAIT);
|
|
if (mtag == NULL)
|
|
goto bad;
|
|
m_tag_prepend(m0, mtag);
|
|
}
|
|
|
|
if (oifp != ifp && mtag == NULL) {
|
|
#if defined(__FreeBSD__)
|
|
PF_UNLOCK();
|
|
if (pf_test(PF_OUT, ifp, &m0) != PF_PASS) {
|
|
PF_LOCK();
|
|
goto bad;
|
|
} else if (m0 == NULL) {
|
|
PF_LOCK();
|
|
goto done;
|
|
}
|
|
PF_LOCK();
|
|
#else
|
|
if (pf_test(PF_OUT, ifp, &m0) != PF_PASS)
|
|
goto bad;
|
|
else if (m0 == NULL)
|
|
goto done;
|
|
#endif
|
|
if (m0->m_len < sizeof(struct ip))
|
|
panic("pf_route: m0->m_len < sizeof(struct ip)");
|
|
ip = mtod(m0, struct ip *);
|
|
}
|
|
|
|
#if defined(__FreeBSD__)
|
|
/* Copied from FreeBSD 5.1-CURRENT ip_output. */
|
|
m0->m_pkthdr.csum_flags |= CSUM_IP;
|
|
sw_csum = m0->m_pkthdr.csum_flags & ~ifp->if_hwassist;
|
|
if (sw_csum & CSUM_DELAY_DATA) {
|
|
/*
|
|
* XXX: in_delayed_cksum assumes HBO for ip->ip_len (at least)
|
|
*/
|
|
NTOHS(ip->ip_len);
|
|
NTOHS(ip->ip_off); /* XXX: needed? */
|
|
in_delayed_cksum(m0);
|
|
HTONS(ip->ip_len);
|
|
HTONS(ip->ip_off);
|
|
sw_csum &= ~CSUM_DELAY_DATA;
|
|
}
|
|
m0->m_pkthdr.csum_flags &= ifp->if_hwassist;
|
|
|
|
if (ntohs(ip->ip_len) <= ifp->if_mtu ||
|
|
(ifp->if_hwassist & CSUM_FRAGMENT &&
|
|
((ip->ip_off & htons(IP_DF)) == 0))) {
|
|
/*
|
|
* ip->ip_len = htons(ip->ip_len);
|
|
* ip->ip_off = htons(ip->ip_off);
|
|
*/
|
|
ip->ip_sum = 0;
|
|
if (sw_csum & CSUM_DELAY_IP) {
|
|
/* From KAME */
|
|
if (ip->ip_v == IPVERSION &&
|
|
(ip->ip_hl << 2) == sizeof(*ip)) {
|
|
ip->ip_sum = in_cksum_hdr(ip);
|
|
} else {
|
|
ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
|
|
}
|
|
}
|
|
PF_UNLOCK();
|
|
error = (*ifp->if_output)(ifp, m0, sintosa(dst), ro->ro_rt);
|
|
PF_LOCK();
|
|
goto done;
|
|
}
|
|
|
|
#else
|
|
/* Copied from ip_output. */
|
|
if (ntohs(ip->ip_len) <= ifp->if_mtu) {
|
|
if ((ifp->if_capabilities & IFCAP_CSUM_IPv4) &&
|
|
ifp->if_bridge == NULL) {
|
|
m0->m_pkthdr.csum |= M_IPV4_CSUM_OUT;
|
|
ipstat.ips_outhwcsum++;
|
|
} else {
|
|
ip->ip_sum = 0;
|
|
ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
|
|
}
|
|
/* Update relevant hardware checksum stats for TCP/UDP */
|
|
if (m0->m_pkthdr.csum & M_TCPV4_CSUM_OUT)
|
|
tcpstat.tcps_outhwcsum++;
|
|
else if (m0->m_pkthdr.csum & M_UDPV4_CSUM_OUT)
|
|
udpstat.udps_outhwcsum++;
|
|
error = (*ifp->if_output)(ifp, m0, sintosa(dst), NULL);
|
|
goto done;
|
|
}
|
|
#endif
|
|
/*
|
|
* Too large for interface; fragment if possible.
|
|
* Must be able to put at least 8 bytes per fragment.
|
|
*/
|
|
if (ip->ip_off & htons(IP_DF)) {
|
|
ipstat.ips_cantfrag++;
|
|
if (r->rt != PF_DUPTO) {
|
|
#if defined(__FreeBSD__)
|
|
/* icmp_error() expects host byte ordering */
|
|
NTOHS(ip->ip_len);
|
|
NTOHS(ip->ip_off);
|
|
PF_UNLOCK();
|
|
#endif
|
|
icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
|
|
ifp);
|
|
#if defined(__FreeBSD__)
|
|
PF_LOCK();
|
|
#endif
|
|
goto done;
|
|
} else
|
|
goto bad;
|
|
}
|
|
|
|
m1 = m0;
|
|
#if defined(__FreeBSD__)
|
|
/*
|
|
* XXX: is cheaper + less error prone than own function
|
|
*/
|
|
NTOHS(ip->ip_len);
|
|
NTOHS(ip->ip_off);
|
|
error = ip_fragment(ip, &m0, ifp->if_mtu, ifp->if_hwassist, sw_csum);
|
|
#else
|
|
error = ip_fragment(m0, ifp, ifp->if_mtu);
|
|
#endif
|
|
#if defined(__FreeBSD__)
|
|
if (error)
|
|
#else
|
|
if (error == EMSGSIZE)
|
|
#endif
|
|
goto bad;
|
|
|
|
for (m0 = m1; m0; m0 = m1) {
|
|
m1 = m0->m_nextpkt;
|
|
m0->m_nextpkt = 0;
|
|
#if defined(__FreeBSD__)
|
|
if (error == 0) {
|
|
PF_UNLOCK();
|
|
error = (*ifp->if_output)(ifp, m0, sintosa(dst),
|
|
NULL);
|
|
PF_LOCK();
|
|
} else
|
|
#else
|
|
if (error == 0)
|
|
error = (*ifp->if_output)(ifp, m0, sintosa(dst),
|
|
NULL);
|
|
else
|
|
#endif
|
|
m_freem(m0);
|
|
}
|
|
|
|
if (error == 0)
|
|
ipstat.ips_fragmented++;
|
|
|
|
done:
|
|
if (r->rt != PF_DUPTO)
|
|
*m = NULL;
|
|
if (ro == &iproute && ro->ro_rt)
|
|
RTFREE(ro->ro_rt);
|
|
return;
|
|
|
|
bad:
|
|
m_freem(m0);
|
|
goto done;
|
|
}
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
void
|
|
pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
|
|
struct pf_state *s)
|
|
{
|
|
struct mbuf *m0;
|
|
struct m_tag *mtag;
|
|
struct route_in6 ip6route;
|
|
struct route_in6 *ro;
|
|
struct sockaddr_in6 *dst;
|
|
struct ip6_hdr *ip6;
|
|
struct ifnet *ifp = NULL;
|
|
struct pf_addr naddr;
|
|
int error = 0;
|
|
|
|
if (m == NULL || *m == NULL || r == NULL ||
|
|
(dir != PF_IN && dir != PF_OUT) || oifp == NULL)
|
|
panic("pf_route6: invalid parameters");
|
|
|
|
if (r->rt == PF_DUPTO) {
|
|
m0 = *m;
|
|
mtag = m_tag_find(m0, PACKET_TAG_PF_ROUTED, NULL);
|
|
if (mtag == NULL) {
|
|
mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 0, M_NOWAIT);
|
|
if (mtag == NULL)
|
|
goto bad;
|
|
m_tag_prepend(m0, mtag);
|
|
}
|
|
#if defined(__FreeBSD__)
|
|
m0 = m_dup(*m, M_DONTWAIT);
|
|
#else
|
|
m0 = m_copym2(*m, 0, M_COPYALL, M_NOWAIT);
|
|
#endif
|
|
if (m0 == NULL)
|
|
return;
|
|
} else {
|
|
if ((r->rt == PF_REPLYTO) == (r->direction == dir))
|
|
return;
|
|
m0 = *m;
|
|
}
|
|
|
|
if (m0->m_len < sizeof(struct ip6_hdr))
|
|
panic("pf_route6: m0->m_len < sizeof(struct ip6_hdr)");
|
|
ip6 = mtod(m0, struct ip6_hdr *);
|
|
|
|
ro = &ip6route;
|
|
bzero((caddr_t)ro, sizeof(*ro));
|
|
dst = (struct sockaddr_in6 *)&ro->ro_dst;
|
|
dst->sin6_family = AF_INET6;
|
|
dst->sin6_len = sizeof(*dst);
|
|
dst->sin6_addr = ip6->ip6_dst;
|
|
|
|
/* Cheat. */
|
|
if (r->rt == PF_FASTROUTE) {
|
|
mtag = m_tag_get(PACKET_TAG_PF_GENERATED, 0, M_NOWAIT);
|
|
if (mtag == NULL)
|
|
goto bad;
|
|
m_tag_prepend(m0, mtag);
|
|
#if defined(__FreeBSD__)
|
|
PF_UNLOCK();
|
|
ip6_output(m0, NULL, NULL, 0, NULL, NULL, NULL);
|
|
PF_LOCK();
|
|
#else
|
|
ip6_output(m0, NULL, NULL, 0, NULL, NULL);
|
|
#endif
|
|
return;
|
|
}
|
|
|
|
if (TAILQ_EMPTY(&r->rpool.list))
|
|
panic("pf_route6: TAILQ_EMPTY(&r->rpool.list)");
|
|
if (s == NULL) {
|
|
pf_map_addr(AF_INET6, &r->rpool,
|
|
(struct pf_addr *)&ip6->ip6_src, &naddr, NULL);
|
|
if (!PF_AZERO(&naddr, AF_INET6))
|
|
PF_ACPY((struct pf_addr *)&dst->sin6_addr,
|
|
&naddr, AF_INET6);
|
|
ifp = r->rpool.cur->ifp;
|
|
} else {
|
|
if (!PF_AZERO(&s->rt_addr, AF_INET6))
|
|
PF_ACPY((struct pf_addr *)&dst->sin6_addr,
|
|
&s->rt_addr, AF_INET6);
|
|
ifp = s->rt_ifp;
|
|
}
|
|
|
|
if (ifp == NULL)
|
|
goto bad;
|
|
|
|
if (oifp != ifp) {
|
|
mtag = m_tag_find(m0, PACKET_TAG_PF_ROUTED, NULL);
|
|
if (mtag == NULL) {
|
|
mtag = m_tag_get(PACKET_TAG_PF_ROUTED, 0, M_NOWAIT);
|
|
if (mtag == NULL)
|
|
goto bad;
|
|
m_tag_prepend(m0, mtag);
|
|
#if defined(__FreeBSD__)
|
|
PF_UNLOCK();
|
|
if (pf_test6(PF_OUT, ifp, &m0) != PF_PASS) {
|
|
PF_LOCK();
|
|
goto bad;
|
|
} else if (m0 == NULL) {
|
|
PF_LOCK();
|
|
goto done;
|
|
}
|
|
PF_LOCK();
|
|
#else
|
|
if (pf_test6(PF_OUT, ifp, &m0) != PF_PASS)
|
|
goto bad;
|
|
else if (m0 == NULL)
|
|
goto done;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the packet is too large for the outgoing interface,
|
|
* send back an icmp6 error.
|
|
*/
|
|
if (IN6_IS_ADDR_LINKLOCAL(&dst->sin6_addr))
|
|
dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
|
|
if ((u_long)m0->m_pkthdr.len <= ifp->if_mtu) {
|
|
#if defined(__FreeBSD__)
|
|
PF_UNLOCK();
|
|
#endif
|
|
error = nd6_output(ifp, ifp, m0, dst, NULL);
|
|
#if defined(__FreeBSD__)
|
|
PF_LOCK();
|
|
#endif
|
|
} else {
|
|
in6_ifstat_inc(ifp, ifs6_in_toobig);
|
|
#if defined(__FreeBSD__)
|
|
if (r->rt != PF_DUPTO) {
|
|
PF_UNLOCK();
|
|
icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
|
|
PF_LOCK();
|
|
} else
|
|
#else
|
|
if (r->rt != PF_DUPTO)
|
|
icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
|
|
else
|
|
#endif
|
|
goto bad;
|
|
}
|
|
|
|
done:
|
|
if (r->rt != PF_DUPTO)
|
|
*m = NULL;
|
|
return;
|
|
|
|
bad:
|
|
m_freem(m0);
|
|
goto done;
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
|
|
#if defined(__FreeBSD__)
|
|
/*
|
|
* XXX
|
|
* FreeBSD supports cksum offload for the following drivers.
|
|
* em(4), gx(4), lge(4), nge(4), ti(4), xl(4)
|
|
* If we can make full use of it we would outperform ipfw/ipfilter in
|
|
* very heavy traffic.
|
|
* I have not tested 'cause I don't have NICs that supports cksum offload.
|
|
* (There might be problems. Typical phenomena would be
|
|
* 1. No route message for UDP packet.
|
|
* 2. No connection acceptance from external hosts regardless of rule set.)
|
|
*/
|
|
int
|
|
pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
|
|
{
|
|
u_int16_t sum = 0;
|
|
int hw_assist = 0;
|
|
struct ip *ip;
|
|
|
|
if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
|
|
return (1);
|
|
if (m->m_pkthdr.len < off + len)
|
|
return (1);
|
|
|
|
switch (p) {
|
|
case IPPROTO_TCP:
|
|
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
|
|
if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
|
|
sum = m->m_pkthdr.csum_data;
|
|
} else {
|
|
ip = mtod(m, struct ip *);
|
|
sum = in_pseudo(ip->ip_src.s_addr,
|
|
ip->ip_dst.s_addr,
|
|
htonl(m->m_pkthdr.csum_data +
|
|
IPPROTO_TCP) + ip->ip_len);
|
|
}
|
|
sum ^= 0xffff;
|
|
++hw_assist;
|
|
}
|
|
break;
|
|
case IPPROTO_UDP:
|
|
if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
|
|
if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
|
|
sum = m->m_pkthdr.csum_data;
|
|
} else {
|
|
ip = mtod(m, struct ip *);
|
|
sum = in_pseudo(ip->ip_src.s_addr,
|
|
ip->ip_dst.s_addr, htonl((u_short)len +
|
|
m->m_pkthdr.csum_data + IPPROTO_UDP));
|
|
}
|
|
sum ^= 0xffff;
|
|
++hw_assist;
|
|
}
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6:
|
|
#endif /* INET6 */
|
|
break;
|
|
default:
|
|
return (1);
|
|
}
|
|
|
|
if (!hw_assist) {
|
|
switch (af) {
|
|
case AF_INET:
|
|
if (p == IPPROTO_ICMP) {
|
|
if (m->m_len < off)
|
|
return (1);
|
|
m->m_data += off;
|
|
m->m_len -= off;
|
|
sum = in_cksum(m, len);
|
|
m->m_data -= off;
|
|
m->m_len += off;
|
|
} else {
|
|
if (m->m_len < sizeof(struct ip))
|
|
return (1);
|
|
sum = in4_cksum(m, p, off, len);
|
|
if (sum == 0) {
|
|
m->m_pkthdr.csum_flags |=
|
|
(CSUM_DATA_VALID |
|
|
CSUM_PSEUDO_HDR);
|
|
m->m_pkthdr.csum_data = 0xffff;
|
|
}
|
|
}
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (m->m_len < sizeof(struct ip6_hdr))
|
|
return (1);
|
|
sum = in6_cksum(m, p, off, len);
|
|
/*
|
|
* XXX
|
|
* IPv6 H/W cksum off-load not supported yet!
|
|
*
|
|
* if (sum == 0) {
|
|
* m->m_pkthdr.csum_flags |=
|
|
* (CSUM_DATA_VALID|CSUM_PSEUDO_HDR);
|
|
* m->m_pkthdr.csum_data = 0xffff;
|
|
*}
|
|
*/
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
return (1);
|
|
}
|
|
}
|
|
if (sum) {
|
|
switch (p) {
|
|
case IPPROTO_TCP:
|
|
tcpstat.tcps_rcvbadsum++;
|
|
break;
|
|
case IPPROTO_UDP:
|
|
udpstat.udps_badsum++;
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
icmpstat.icps_checksum++;
|
|
break;
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6:
|
|
icmp6stat.icp6s_checksum++;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
return (1);
|
|
}
|
|
return (0);
|
|
}
|
|
#else
|
|
/*
|
|
* check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
|
|
* off is the offset where the protocol header starts
|
|
* len is the total length of protocol header plus payload
|
|
* returns 0 when the checksum is valid, otherwise returns 1.
|
|
*/
|
|
int
|
|
pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p, sa_family_t af)
|
|
{
|
|
u_int16_t flag_ok, flag_bad;
|
|
u_int16_t sum;
|
|
|
|
switch (p) {
|
|
case IPPROTO_TCP:
|
|
flag_ok = M_TCP_CSUM_IN_OK;
|
|
flag_bad = M_TCP_CSUM_IN_BAD;
|
|
break;
|
|
case IPPROTO_UDP:
|
|
flag_ok = M_UDP_CSUM_IN_OK;
|
|
flag_bad = M_UDP_CSUM_IN_BAD;
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6:
|
|
#endif /* INET6 */
|
|
flag_ok = flag_bad = 0;
|
|
break;
|
|
default:
|
|
return (1);
|
|
}
|
|
if (m->m_pkthdr.csum & flag_ok)
|
|
return (0);
|
|
if (m->m_pkthdr.csum & flag_bad)
|
|
return (1);
|
|
if (off < sizeof(struct ip) || len < sizeof(struct udphdr))
|
|
return (1);
|
|
if (m->m_pkthdr.len < off + len)
|
|
return (1);
|
|
switch (af) {
|
|
case AF_INET:
|
|
if (p == IPPROTO_ICMP) {
|
|
if (m->m_len < off)
|
|
return (1);
|
|
m->m_data += off;
|
|
m->m_len -= off;
|
|
sum = in_cksum(m, len);
|
|
m->m_data -= off;
|
|
m->m_len += off;
|
|
} else {
|
|
if (m->m_len < sizeof(struct ip))
|
|
return (1);
|
|
sum = in4_cksum(m, p, off, len);
|
|
}
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (m->m_len < sizeof(struct ip6_hdr))
|
|
return (1);
|
|
sum = in6_cksum(m, p, off, len);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
return (1);
|
|
}
|
|
if (sum) {
|
|
m->m_pkthdr.csum |= flag_bad;
|
|
switch (p) {
|
|
case IPPROTO_TCP:
|
|
tcpstat.tcps_rcvbadsum++;
|
|
break;
|
|
case IPPROTO_UDP:
|
|
udpstat.udps_badsum++;
|
|
break;
|
|
case IPPROTO_ICMP:
|
|
icmpstat.icps_checksum++;
|
|
break;
|
|
#ifdef INET6
|
|
case IPPROTO_ICMPV6:
|
|
icmp6stat.icp6s_checksum++;
|
|
break;
|
|
#endif /* INET6 */
|
|
}
|
|
return (1);
|
|
}
|
|
m->m_pkthdr.csum |= flag_ok;
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET
|
|
int
|
|
pf_test(int dir, struct ifnet *ifp, struct mbuf **m0)
|
|
{
|
|
u_short action, reason = 0, log = 0;
|
|
struct mbuf *m = *m0;
|
|
struct ip *h;
|
|
struct pf_rule *a = NULL, *r = &pf_default_rule, *tr;
|
|
struct pf_state *s = NULL;
|
|
struct pf_ruleset *ruleset = NULL;
|
|
struct pf_pdesc pd;
|
|
int off;
|
|
int pqid = 0;
|
|
|
|
#if defined(__FreeBSD__)
|
|
PF_LOCK();
|
|
#endif
|
|
if (!pf_status.running ||
|
|
(m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) {
|
|
#if defined(__FreeBSD__)
|
|
PF_UNLOCK();
|
|
#endif
|
|
return (PF_PASS);
|
|
}
|
|
|
|
#if defined(__FreeBSD__) && (__FreeBSD_version >= 501000)
|
|
M_ASSERTPKTHDR(m);
|
|
#else
|
|
#ifdef DIAGNOSTIC
|
|
if ((m->m_flags & M_PKTHDR) == 0)
|
|
panic("non-M_PKTHDR is passed to pf_test");
|
|
#endif
|
|
#endif
|
|
|
|
if (m->m_pkthdr.len < (int)sizeof(*h)) {
|
|
action = PF_DROP;
|
|
REASON_SET(&reason, PFRES_SHORT);
|
|
log = 1;
|
|
goto done;
|
|
}
|
|
|
|
/* We do IP header normalization and packet reassembly here */
|
|
if (pf_normalize_ip(m0, dir, ifp, &reason) != PF_PASS) {
|
|
action = PF_DROP;
|
|
goto done;
|
|
}
|
|
m = *m0;
|
|
h = mtod(m, struct ip *);
|
|
|
|
off = h->ip_hl << 2;
|
|
if (off < (int)sizeof(*h)) {
|
|
action = PF_DROP;
|
|
REASON_SET(&reason, PFRES_SHORT);
|
|
log = 1;
|
|
goto done;
|
|
}
|
|
|
|
memset(&pd, 0, sizeof(pd));
|
|
pd.src = (struct pf_addr *)&h->ip_src;
|
|
pd.dst = (struct pf_addr *)&h->ip_dst;
|
|
pd.ip_sum = &h->ip_sum;
|
|
pd.proto = h->ip_p;
|
|
pd.af = AF_INET;
|
|
pd.tos = h->ip_tos;
|
|
pd.tot_len = ntohs(h->ip_len);
|
|
|
|
/* handle fragments that didn't get reassembled by normalization */
|
|
if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
|
|
action = pf_test_fragment(&r, dir, ifp, m, h,
|
|
&pd, &a, &ruleset);
|
|
goto done;
|
|
}
|
|
|
|
switch (h->ip_p) {
|
|
|
|
case IPPROTO_TCP: {
|
|
struct tcphdr th;
|
|
|
|
pd.hdr.tcp = &th;
|
|
if (!pf_pull_hdr(m, off, &th, sizeof(th),
|
|
&action, &reason, AF_INET)) {
|
|
log = action != PF_PASS;
|
|
goto done;
|
|
}
|
|
if (dir == PF_IN && pf_check_proto_cksum(m, off,
|
|
ntohs(h->ip_len) - off, IPPROTO_TCP, AF_INET)) {
|
|
action = PF_DROP;
|
|
goto done;
|
|
}
|
|
pd.p_len = pd.tot_len - off - (th.th_off << 2);
|
|
if ((th.th_flags & TH_ACK) && pd.p_len == 0)
|
|
pqid = 1;
|
|
action = pf_normalize_tcp(dir, ifp, m, 0, off, h, &pd);
|
|
if (action == PF_DROP)
|
|
break;
|
|
action = pf_test_state_tcp(&s, dir, ifp, m, 0, off, h, &pd,
|
|
&reason);
|
|
if (action == PF_PASS) {
|
|
r = s->rule.ptr;
|
|
log = s->log;
|
|
} else if (s == NULL)
|
|
action = pf_test_tcp(&r, &s, dir, ifp,
|
|
m, 0, off, h, &pd, &a, &ruleset);
|
|
break;
|
|
}
|
|
|
|
case IPPROTO_UDP: {
|
|
struct udphdr uh;
|
|
|
|
pd.hdr.udp = &uh;
|
|
if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
|
|
&action, &reason, AF_INET)) {
|
|
log = action != PF_PASS;
|
|
goto done;
|
|
}
|
|
if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
|
|
off, ntohs(h->ip_len) - off, IPPROTO_UDP, AF_INET)) {
|
|
action = PF_DROP;
|
|
goto done;
|
|
}
|
|
action = pf_test_state_udp(&s, dir, ifp, m, 0, off, h, &pd);
|
|
if (action == PF_PASS) {
|
|
r = s->rule.ptr;
|
|
a = s->anchor.ptr;
|
|
log = s->log;
|
|
} else if (s == NULL)
|
|
action = pf_test_udp(&r, &s, dir, ifp,
|
|
m, 0, off, h, &pd, &a, &ruleset);
|
|
break;
|
|
}
|
|
|
|
case IPPROTO_ICMP: {
|
|
struct icmp ih;
|
|
|
|
pd.hdr.icmp = &ih;
|
|
if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
|
|
&action, &reason, AF_INET)) {
|
|
log = action != PF_PASS;
|
|
goto done;
|
|
}
|
|
if (dir == PF_IN && pf_check_proto_cksum(m, off,
|
|
ntohs(h->ip_len) - off, IPPROTO_ICMP, AF_INET)) {
|
|
action = PF_DROP;
|
|
goto done;
|
|
}
|
|
action = pf_test_state_icmp(&s, dir, ifp, m, 0, off, h, &pd);
|
|
if (action == PF_PASS) {
|
|
r = s->rule.ptr;
|
|
r->packets++;
|
|
r->bytes += ntohs(h->ip_len);
|
|
a = s->anchor.ptr;
|
|
if (a != NULL) {
|
|
a->packets++;
|
|
a->bytes += ntohs(h->ip_len);
|
|
}
|
|
log = s->log;
|
|
} else if (s == NULL)
|
|
action = pf_test_icmp(&r, &s, dir, ifp,
|
|
m, 0, off, h, &pd, &a, &ruleset);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
action = pf_test_state_other(&s, dir, ifp, &pd);
|
|
if (action == PF_PASS) {
|
|
r = s->rule.ptr;
|
|
a = s->anchor.ptr;
|
|
log = s->log;
|
|
} else if (s == NULL)
|
|
action = pf_test_other(&r, &s, dir, ifp, m, off, h,
|
|
&pd, &a, &ruleset);
|
|
break;
|
|
}
|
|
|
|
if (ifp == status_ifp) {
|
|
pf_status.bcounters[0][dir == PF_OUT] += pd.tot_len;
|
|
pf_status.pcounters[0][dir == PF_OUT][action != PF_PASS]++;
|
|
}
|
|
|
|
done:
|
|
tr = r;
|
|
if (r == &pf_default_rule && s != NULL && s->nat_rule.ptr != NULL)
|
|
tr = s->nat_rule.ptr;
|
|
if (tr->src.addr.type == PF_ADDR_TABLE)
|
|
pfr_update_stats(tr->src.addr.p.tbl,
|
|
(s == NULL || s->direction == dir) ? pd.src : pd.dst, pd.af,
|
|
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
|
|
tr->src.not);
|
|
if (tr->dst.addr.type == PF_ADDR_TABLE)
|
|
pfr_update_stats(tr->dst.addr.p.tbl,
|
|
(s == NULL || s->direction == dir) ? pd.dst : pd.src, pd.af,
|
|
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
|
|
tr->dst.not);
|
|
|
|
if (action == PF_PASS && h->ip_hl > 5 &&
|
|
!((s && s->allow_opts) || r->allow_opts)) {
|
|
action = PF_DROP;
|
|
REASON_SET(&reason, PFRES_SHORT);
|
|
log = 1;
|
|
DPFPRINTF(PF_DEBUG_MISC,
|
|
("pf: dropping packet with ip options\n"));
|
|
}
|
|
|
|
#ifdef ALTQ
|
|
if (action == PF_PASS && r->qid) {
|
|
struct m_tag *mtag;
|
|
struct altq_tag *atag;
|
|
|
|
mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
|
|
if (mtag != NULL) {
|
|
atag = (struct altq_tag *)(mtag + 1);
|
|
if (pqid || pd.tos == IPTOS_LOWDELAY)
|
|
atag->qid = r->pqid;
|
|
else
|
|
atag->qid = r->qid;
|
|
/* add hints for ecn */
|
|
atag->af = AF_INET;
|
|
atag->hdr = h;
|
|
m_tag_prepend(m, mtag);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (log)
|
|
PFLOG_PACKET(ifp, h, m, AF_INET, dir, reason, r, a, ruleset);
|
|
|
|
if (action == PF_SYNPROXY_DROP) {
|
|
m_freem(*m0);
|
|
*m0 = NULL;
|
|
action = PF_PASS;
|
|
} else if (r->rt)
|
|
/* pf_route can free the mbuf causing *m0 to become NULL */
|
|
pf_route(m0, r, dir, ifp, s);
|
|
|
|
#if defined(__FreeBSD__)
|
|
PF_UNLOCK();
|
|
#endif
|
|
|
|
return (action);
|
|
}
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
int
|
|
pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0)
|
|
{
|
|
u_short action, reason = 0, log = 0;
|
|
struct mbuf *m = *m0;
|
|
struct ip6_hdr *h;
|
|
struct pf_rule *a = NULL, *r = &pf_default_rule, *tr;
|
|
struct pf_state *s = NULL;
|
|
struct pf_ruleset *ruleset = NULL;
|
|
struct pf_pdesc pd;
|
|
int off, terminal = 0;
|
|
|
|
#if defined(__FreeBSD__)
|
|
PF_LOCK();
|
|
#endif
|
|
|
|
if (!pf_status.running ||
|
|
(m_tag_find(m, PACKET_TAG_PF_GENERATED, NULL) != NULL)) {
|
|
#if defined(__FreeBSD__)
|
|
PF_UNLOCK();
|
|
#endif
|
|
return (PF_PASS);
|
|
}
|
|
|
|
#if defined(__FreeBSD__) && (__FreeBSD_version >= 501000)
|
|
M_ASSERTPKTHDR(m);
|
|
#else
|
|
#ifdef DIAGNOSTIC
|
|
if ((m->m_flags & M_PKTHDR) == 0)
|
|
panic("non-M_PKTHDR is passed to pf_test");
|
|
#endif
|
|
#endif
|
|
|
|
if (m->m_pkthdr.len < (int)sizeof(*h)) {
|
|
action = PF_DROP;
|
|
REASON_SET(&reason, PFRES_SHORT);
|
|
log = 1;
|
|
goto done;
|
|
}
|
|
|
|
/* We do IP header normalization and packet reassembly here */
|
|
if (pf_normalize_ip6(m0, dir, ifp, &reason) != PF_PASS) {
|
|
action = PF_DROP;
|
|
goto done;
|
|
}
|
|
m = *m0;
|
|
h = mtod(m, struct ip6_hdr *);
|
|
|
|
memset(&pd, 0, sizeof(pd));
|
|
pd.src = (struct pf_addr *)&h->ip6_src;
|
|
pd.dst = (struct pf_addr *)&h->ip6_dst;
|
|
pd.ip_sum = NULL;
|
|
pd.af = AF_INET6;
|
|
pd.tos = 0;
|
|
pd.tot_len = ntohs(h->ip6_plen) + sizeof(struct ip6_hdr);
|
|
|
|
off = ((caddr_t)h - m->m_data) + sizeof(struct ip6_hdr);
|
|
pd.proto = h->ip6_nxt;
|
|
do {
|
|
switch (pd.proto) {
|
|
case IPPROTO_FRAGMENT:
|
|
action = pf_test_fragment(&r, dir, ifp, m, h,
|
|
&pd, &a, &ruleset);
|
|
if (action == PF_DROP)
|
|
REASON_SET(&reason, PFRES_FRAG);
|
|
goto done;
|
|
case IPPROTO_AH:
|
|
case IPPROTO_HOPOPTS:
|
|
case IPPROTO_ROUTING:
|
|
case IPPROTO_DSTOPTS: {
|
|
/* get next header and header length */
|
|
struct ip6_ext opt6;
|
|
|
|
if (!pf_pull_hdr(m, off, &opt6, sizeof(opt6),
|
|
NULL, NULL, pd.af)) {
|
|
DPFPRINTF(PF_DEBUG_MISC,
|
|
("pf: IPv6 short opt\n"));
|
|
action = PF_DROP;
|
|
REASON_SET(&reason, PFRES_SHORT);
|
|
log = 1;
|
|
goto done;
|
|
}
|
|
if (pd.proto == IPPROTO_AH)
|
|
off += (opt6.ip6e_len + 2) * 4;
|
|
else
|
|
off += (opt6.ip6e_len + 1) * 8;
|
|
pd.proto = opt6.ip6e_nxt;
|
|
/* goto the next header */
|
|
break;
|
|
}
|
|
default:
|
|
terminal++;
|
|
break;
|
|
}
|
|
} while (!terminal);
|
|
|
|
switch (pd.proto) {
|
|
|
|
case IPPROTO_TCP: {
|
|
struct tcphdr th;
|
|
|
|
pd.hdr.tcp = &th;
|
|
if (!pf_pull_hdr(m, off, &th, sizeof(th),
|
|
&action, &reason, AF_INET6)) {
|
|
log = action != PF_PASS;
|
|
goto done;
|
|
}
|
|
if (dir == PF_IN && pf_check_proto_cksum(m, off,
|
|
ntohs(h->ip6_plen), IPPROTO_TCP, AF_INET6)) {
|
|
action = PF_DROP;
|
|
goto done;
|
|
}
|
|
pd.p_len = pd.tot_len - off - (th.th_off << 2);
|
|
action = pf_normalize_tcp(dir, ifp, m, 0, off, h, &pd);
|
|
if (action == PF_DROP)
|
|
break;
|
|
action = pf_test_state_tcp(&s, dir, ifp, m, 0, off, h, &pd,
|
|
&reason);
|
|
if (action == PF_PASS) {
|
|
r = s->rule.ptr;
|
|
log = s->log;
|
|
} else if (s == NULL)
|
|
action = pf_test_tcp(&r, &s, dir, ifp,
|
|
m, 0, off, h, &pd, &a, &ruleset);
|
|
break;
|
|
}
|
|
|
|
case IPPROTO_UDP: {
|
|
struct udphdr uh;
|
|
|
|
pd.hdr.udp = &uh;
|
|
if (!pf_pull_hdr(m, off, &uh, sizeof(uh),
|
|
&action, &reason, AF_INET6)) {
|
|
log = action != PF_PASS;
|
|
goto done;
|
|
}
|
|
if (dir == PF_IN && uh.uh_sum && pf_check_proto_cksum(m,
|
|
off, ntohs(h->ip6_plen), IPPROTO_UDP, AF_INET6)) {
|
|
action = PF_DROP;
|
|
goto done;
|
|
}
|
|
action = pf_test_state_udp(&s, dir, ifp, m, 0, off, h, &pd);
|
|
if (action == PF_PASS) {
|
|
r = s->rule.ptr;
|
|
log = s->log;
|
|
} else if (s == NULL)
|
|
action = pf_test_udp(&r, &s, dir, ifp,
|
|
m, 0, off, h, &pd, &a, &ruleset);
|
|
break;
|
|
}
|
|
|
|
case IPPROTO_ICMPV6: {
|
|
struct icmp6_hdr ih;
|
|
|
|
pd.hdr.icmp6 = &ih;
|
|
if (!pf_pull_hdr(m, off, &ih, sizeof(ih),
|
|
&action, &reason, AF_INET6)) {
|
|
log = action != PF_PASS;
|
|
goto done;
|
|
}
|
|
if (dir == PF_IN && pf_check_proto_cksum(m, off,
|
|
ntohs(h->ip6_plen), IPPROTO_ICMPV6, AF_INET6)) {
|
|
action = PF_DROP;
|
|
goto done;
|
|
}
|
|
action = pf_test_state_icmp(&s, dir, ifp,
|
|
m, 0, off, h, &pd);
|
|
if (action == PF_PASS) {
|
|
r = s->rule.ptr;
|
|
r->packets++;
|
|
r->bytes += h->ip6_plen;
|
|
log = s->log;
|
|
} else if (s == NULL)
|
|
action = pf_test_icmp(&r, &s, dir, ifp,
|
|
m, 0, off, h, &pd, &a, &ruleset);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
action = pf_test_other(&r, &s, dir, ifp, m, off, h,
|
|
&pd, &a, &ruleset);
|
|
break;
|
|
}
|
|
|
|
if (ifp == status_ifp) {
|
|
pf_status.bcounters[1][dir == PF_OUT] += pd.tot_len;
|
|
pf_status.pcounters[1][dir == PF_OUT][action != PF_PASS]++;
|
|
}
|
|
|
|
done:
|
|
tr = r;
|
|
if (r == &pf_default_rule && s != NULL && s->nat_rule.ptr != NULL)
|
|
tr = s->nat_rule.ptr;
|
|
if (tr->src.addr.type == PF_ADDR_TABLE)
|
|
pfr_update_stats(tr->src.addr.p.tbl,
|
|
(s == NULL || s->direction == dir) ? pd.src : pd.dst, pd.af,
|
|
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
|
|
tr->src.not);
|
|
if (tr->dst.addr.type == PF_ADDR_TABLE)
|
|
pfr_update_stats(tr->dst.addr.p.tbl,
|
|
(s == NULL || s->direction == dir) ? pd.dst : pd.src, pd.af,
|
|
pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
|
|
tr->dst.not);
|
|
|
|
/* XXX handle IPv6 options, if not allowed. not implemented. */
|
|
|
|
#ifdef ALTQ
|
|
if (action == PF_PASS && r->qid) {
|
|
struct m_tag *mtag;
|
|
struct altq_tag *atag;
|
|
|
|
mtag = m_tag_get(PACKET_TAG_PF_QID, sizeof(*atag), M_NOWAIT);
|
|
if (mtag != NULL) {
|
|
atag = (struct altq_tag *)(mtag + 1);
|
|
if (pd.tos == IPTOS_LOWDELAY)
|
|
atag->qid = r->pqid;
|
|
else
|
|
atag->qid = r->qid;
|
|
/* add hints for ecn */
|
|
atag->af = AF_INET6;
|
|
atag->hdr = h;
|
|
m_tag_prepend(m, mtag);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
if (log)
|
|
PFLOG_PACKET(ifp, h, m, AF_INET6, dir, reason, r, a, ruleset);
|
|
|
|
if (action == PF_SYNPROXY_DROP) {
|
|
m_freem(*m0);
|
|
*m0 = NULL;
|
|
action = PF_PASS;
|
|
} else if (r->rt)
|
|
/* pf_route6 can free the mbuf causing *m0 to become NULL */
|
|
pf_route6(m0, r, dir, ifp, s);
|
|
|
|
#if defined(__FreeBSD__)
|
|
PF_UNLOCK();
|
|
#endif
|
|
return (action);
|
|
}
|
|
#endif /* INET6 */
|