db333db4e6
ip_divert work as a client of pf(4), make ip_divert not depend on ipfw. This is achieved by moving to ip_var.h the struct ipfw_rule_ref (which is part of the mtag for all reinjected packets) and other declarations of global variables, and moving to raw_ip.c global variables for filter and divert hooks. Note that names and locations could be made more generic (ipfw_rule_ref is really a generic reference robust to reconfigurations; the packet filter is not necessarily ipfw; filters and their clients are not necessarily limited to ipv4), but _right now_ most of this stuff works on ipfw and ipv4, so i don't feel like doing a gratuitous renaming, at least for the time being.
314 lines
12 KiB
C
314 lines
12 KiB
C
/*-
|
|
* Copyright (c) 1982, 1986, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* @(#)ip_var.h 8.2 (Berkeley) 1/9/95
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef _NETINET_IP_VAR_H_
|
|
#define _NETINET_IP_VAR_H_
|
|
|
|
#include <sys/queue.h>
|
|
|
|
/*
|
|
* Overlay for ip header used by other protocols (tcp, udp).
|
|
*/
|
|
struct ipovly {
|
|
u_char ih_x1[9]; /* (unused) */
|
|
u_char ih_pr; /* protocol */
|
|
u_short ih_len; /* protocol length */
|
|
struct in_addr ih_src; /* source internet address */
|
|
struct in_addr ih_dst; /* destination internet address */
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
/*
|
|
* Ip reassembly queue structure. Each fragment
|
|
* being reassembled is attached to one of these structures.
|
|
* They are timed out after ipq_ttl drops to 0, and may also
|
|
* be reclaimed if memory becomes tight.
|
|
*/
|
|
struct ipq {
|
|
TAILQ_ENTRY(ipq) ipq_list; /* to other reass headers */
|
|
u_char ipq_ttl; /* time for reass q to live */
|
|
u_char ipq_p; /* protocol of this fragment */
|
|
u_short ipq_id; /* sequence id for reassembly */
|
|
struct mbuf *ipq_frags; /* to ip headers of fragments */
|
|
struct in_addr ipq_src,ipq_dst;
|
|
u_char ipq_nfrags; /* # frags in this packet */
|
|
struct label *ipq_label; /* MAC label */
|
|
};
|
|
#endif /* _KERNEL */
|
|
|
|
/*
|
|
* Structure stored in mbuf in inpcb.ip_options
|
|
* and passed to ip_output when ip options are in use.
|
|
* The actual length of the options (including ipopt_dst)
|
|
* is in m_len.
|
|
*/
|
|
#define MAX_IPOPTLEN 40
|
|
|
|
struct ipoption {
|
|
struct in_addr ipopt_dst; /* first-hop dst if source routed */
|
|
char ipopt_list[MAX_IPOPTLEN]; /* options proper */
|
|
};
|
|
|
|
/*
|
|
* Structure attached to inpcb.ip_moptions and
|
|
* passed to ip_output when IP multicast options are in use.
|
|
* This structure is lazy-allocated.
|
|
*/
|
|
struct ip_moptions {
|
|
struct ifnet *imo_multicast_ifp; /* ifp for outgoing multicasts */
|
|
struct in_addr imo_multicast_addr; /* ifindex/addr on MULTICAST_IF */
|
|
u_long imo_multicast_vif; /* vif num outgoing multicasts */
|
|
u_char imo_multicast_ttl; /* TTL for outgoing multicasts */
|
|
u_char imo_multicast_loop; /* 1 => hear sends if a member */
|
|
u_short imo_num_memberships; /* no. memberships this socket */
|
|
u_short imo_max_memberships; /* max memberships this socket */
|
|
struct in_multi **imo_membership; /* group memberships */
|
|
struct in_mfilter *imo_mfilters; /* source filters */
|
|
};
|
|
|
|
struct ipstat {
|
|
u_long ips_total; /* total packets received */
|
|
u_long ips_badsum; /* checksum bad */
|
|
u_long ips_tooshort; /* packet too short */
|
|
u_long ips_toosmall; /* not enough data */
|
|
u_long ips_badhlen; /* ip header length < data size */
|
|
u_long ips_badlen; /* ip length < ip header length */
|
|
u_long ips_fragments; /* fragments received */
|
|
u_long ips_fragdropped; /* frags dropped (dups, out of space) */
|
|
u_long ips_fragtimeout; /* fragments timed out */
|
|
u_long ips_forward; /* packets forwarded */
|
|
u_long ips_fastforward; /* packets fast forwarded */
|
|
u_long ips_cantforward; /* packets rcvd for unreachable dest */
|
|
u_long ips_redirectsent; /* packets forwarded on same net */
|
|
u_long ips_noproto; /* unknown or unsupported protocol */
|
|
u_long ips_delivered; /* datagrams delivered to upper level*/
|
|
u_long ips_localout; /* total ip packets generated here */
|
|
u_long ips_odropped; /* lost packets due to nobufs, etc. */
|
|
u_long ips_reassembled; /* total packets reassembled ok */
|
|
u_long ips_fragmented; /* datagrams successfully fragmented */
|
|
u_long ips_ofragments; /* output fragments created */
|
|
u_long ips_cantfrag; /* don't fragment flag was set, etc. */
|
|
u_long ips_badoptions; /* error in option processing */
|
|
u_long ips_noroute; /* packets discarded due to no route */
|
|
u_long ips_badvers; /* ip version != 4 */
|
|
u_long ips_rawout; /* total raw ip packets generated */
|
|
u_long ips_toolong; /* ip length > max ip packet size */
|
|
u_long ips_notmember; /* multicasts for unregistered grps */
|
|
u_long ips_nogif; /* no match gif found */
|
|
u_long ips_badaddr; /* invalid address on header */
|
|
};
|
|
|
|
#ifdef _KERNEL
|
|
|
|
#include <net/vnet.h>
|
|
|
|
/*
|
|
* In-kernel consumers can use these accessor macros directly to update
|
|
* stats.
|
|
*/
|
|
#define IPSTAT_ADD(name, val) V_ipstat.name += (val)
|
|
#define IPSTAT_SUB(name, val) V_ipstat.name -= (val)
|
|
#define IPSTAT_INC(name) IPSTAT_ADD(name, 1)
|
|
#define IPSTAT_DEC(name) IPSTAT_SUB(name, 1)
|
|
|
|
/*
|
|
* Kernel module consumers must use this accessor macro.
|
|
*/
|
|
void kmod_ipstat_inc(int statnum);
|
|
#define KMOD_IPSTAT_INC(name) \
|
|
kmod_ipstat_inc(offsetof(struct ipstat, name) / sizeof(u_long))
|
|
void kmod_ipstat_dec(int statnum);
|
|
#define KMOD_IPSTAT_DEC(name) \
|
|
kmod_ipstat_dec(offsetof(struct ipstat, name) / sizeof(u_long))
|
|
|
|
/* flags passed to ip_output as last parameter */
|
|
#define IP_FORWARDING 0x1 /* most of ip header exists */
|
|
#define IP_RAWOUTPUT 0x2 /* raw ip header exists */
|
|
#define IP_SENDONES 0x4 /* send all-ones broadcast */
|
|
#define IP_SENDTOIF 0x8 /* send on specific ifnet */
|
|
#define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */
|
|
#define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */
|
|
|
|
/*
|
|
* mbuf flag used by ip_fastfwd
|
|
*/
|
|
#define M_FASTFWD_OURS M_PROTO1 /* changed dst to local */
|
|
|
|
#ifdef __NO_STRICT_ALIGNMENT
|
|
#define IP_HDR_ALIGNED_P(ip) 1
|
|
#else
|
|
#define IP_HDR_ALIGNED_P(ip) ((((intptr_t) (ip)) & 3) == 0)
|
|
#endif
|
|
|
|
struct ip;
|
|
struct inpcb;
|
|
struct route;
|
|
struct sockopt;
|
|
|
|
VNET_DECLARE(struct ipstat, ipstat);
|
|
VNET_DECLARE(u_short, ip_id); /* ip packet ctr, for ids */
|
|
VNET_DECLARE(int, ip_defttl); /* default IP ttl */
|
|
VNET_DECLARE(int, ipforwarding); /* ip forwarding */
|
|
#ifdef IPSTEALTH
|
|
VNET_DECLARE(int, ipstealth); /* stealth forwarding */
|
|
#endif
|
|
VNET_DECLARE(int, rsvp_on);
|
|
VNET_DECLARE(struct socket *, ip_rsvpd); /* reservation protocol daemon*/
|
|
VNET_DECLARE(struct socket *, ip_mrouter); /* multicast routing daemon */
|
|
|
|
#define V_ipstat VNET(ipstat)
|
|
#define V_ip_id VNET(ip_id)
|
|
#define V_ip_defttl VNET(ip_defttl)
|
|
#define V_ipforwarding VNET(ipforwarding)
|
|
#ifdef IPSTEALTH
|
|
#define V_ipstealth VNET(ipstealth)
|
|
#endif
|
|
#define V_rsvp_on VNET(rsvp_on)
|
|
#define V_ip_rsvpd VNET(ip_rsvpd)
|
|
#define V_ip_mrouter VNET(ip_mrouter)
|
|
|
|
extern u_char ip_protox[];
|
|
extern int (*legal_vif_num)(int);
|
|
extern u_long (*ip_mcast_src)(int);
|
|
extern struct pr_usrreqs rip_usrreqs;
|
|
|
|
void inp_freemoptions(struct ip_moptions *);
|
|
int inp_getmoptions(struct inpcb *, struct sockopt *);
|
|
int inp_setmoptions(struct inpcb *, struct sockopt *);
|
|
|
|
int ip_ctloutput(struct socket *, struct sockopt *sopt);
|
|
void ip_drain(void);
|
|
void ip_fini(void *xtp);
|
|
int ip_fragment(struct ip *ip, struct mbuf **m_frag, int mtu,
|
|
u_long if_hwassist_flags, int sw_csum);
|
|
void ip_forward(struct mbuf *m, int srcrt);
|
|
void ip_init(void);
|
|
extern int
|
|
(*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
|
|
struct ip_moptions *);
|
|
int ip_output(struct mbuf *,
|
|
struct mbuf *, struct route *, int, struct ip_moptions *,
|
|
struct inpcb *);
|
|
int ipproto_register(u_char);
|
|
int ipproto_unregister(u_char);
|
|
struct mbuf *
|
|
ip_reass(struct mbuf *);
|
|
struct in_ifaddr *
|
|
ip_rtaddr(struct in_addr, u_int fibnum);
|
|
void ip_savecontrol(struct inpcb *, struct mbuf **, struct ip *,
|
|
struct mbuf *);
|
|
void ip_slowtimo(void);
|
|
u_int16_t ip_randomid(void);
|
|
int rip_ctloutput(struct socket *, struct sockopt *);
|
|
void rip_ctlinput(int, struct sockaddr *, void *);
|
|
void rip_init(void);
|
|
#ifdef VIMAGE
|
|
void rip_destroy(void);
|
|
#endif
|
|
void rip_input(struct mbuf *, int);
|
|
int rip_output(struct mbuf *, struct socket *, u_long);
|
|
void ipip_input(struct mbuf *, int);
|
|
void rsvp_input(struct mbuf *, int);
|
|
int ip_rsvp_init(struct socket *);
|
|
int ip_rsvp_done(void);
|
|
extern int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
|
|
extern void (*ip_rsvp_force_done)(struct socket *);
|
|
extern void (*rsvp_input_p)(struct mbuf *m, int off);
|
|
|
|
VNET_DECLARE(struct pfil_head, inet_pfil_hook); /* packet filter hooks */
|
|
#define V_inet_pfil_hook VNET(inet_pfil_hook)
|
|
|
|
void in_delayed_cksum(struct mbuf *m);
|
|
|
|
/* Hooks for ipfw, dummynet, divert etc. Most are declared in raw_ip.c */
|
|
/*
|
|
* Reference to an ipfw or packet filter rule that can be carried
|
|
* outside critical sections.
|
|
* A rule is identified by rulenum:rule_id which is ordered.
|
|
* In version chain_id the rule can be found in slot 'slot', so
|
|
* we don't need a lookup if chain_id == chain->id.
|
|
*
|
|
* On exit from the firewall this structure refers to the rule after
|
|
* the matching one (slot points to the new rule; rulenum:rule_id-1
|
|
* is the matching rule), and additional info (e.g. info often contains
|
|
* the insn argument or tablearg in the low 16 bits, in host format).
|
|
* On entry, the structure is valid if slot>0, and refers to the starting
|
|
* rules. 'info' contains the reason for reinject, e.g. divert port,
|
|
* divert direction, and so on.
|
|
*/
|
|
struct ipfw_rule_ref {
|
|
uint32_t slot; /* slot for matching rule */
|
|
uint32_t rulenum; /* matching rule number */
|
|
uint32_t rule_id; /* matching rule id */
|
|
uint32_t chain_id; /* ruleset id */
|
|
uint32_t info; /* see below */
|
|
};
|
|
|
|
enum {
|
|
IPFW_INFO_MASK = 0x0000ffff,
|
|
IPFW_INFO_OUT = 0x00000000, /* outgoing, just for convenience */
|
|
IPFW_INFO_IN = 0x80000000, /* incoming, overloads dir */
|
|
IPFW_ONEPASS = 0x40000000, /* One-pass, do not reinject */
|
|
IPFW_IS_MASK = 0x30000000, /* which source ? */
|
|
IPFW_IS_DIVERT = 0x20000000,
|
|
IPFW_IS_DUMMYNET =0x10000000,
|
|
IPFW_IS_PIPE = 0x08000000, /* pip1=1, queue = 0 */
|
|
};
|
|
#define MTAG_IPFW 1148380143 /* IPFW-tagged cookie */
|
|
#define MTAG_IPFW_RULE 1262273568 /* rule reference */
|
|
|
|
struct ip_fw_args;
|
|
typedef int (*ip_fw_chk_ptr_t)(struct ip_fw_args *args);
|
|
typedef int (*ip_fw_ctl_ptr_t)(struct sockopt *);
|
|
VNET_DECLARE(ip_fw_chk_ptr_t, ip_fw_chk_ptr);
|
|
VNET_DECLARE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr);
|
|
#define V_ip_fw_chk_ptr VNET(ip_fw_chk_ptr)
|
|
#define V_ip_fw_ctl_ptr VNET(ip_fw_ctl_ptr)
|
|
|
|
/* Divert hooks. */
|
|
extern void (*ip_divert_ptr)(struct mbuf *m, int incoming);
|
|
/* ng_ipfw hooks -- XXX make it the same as divert and dummynet */
|
|
extern int (*ng_ipfw_input_p)(struct mbuf **, int,
|
|
struct ip_fw_args *, int);
|
|
|
|
extern int (*ip_dn_ctl_ptr)(struct sockopt *);
|
|
extern int (*ip_dn_io_ptr)(struct mbuf **, int, struct ip_fw_args *);
|
|
|
|
VNET_DECLARE(int, ip_do_randomid);
|
|
#define V_ip_do_randomid VNET(ip_do_randomid)
|
|
#define ip_newid() ((V_ip_do_randomid != 0) ? ip_randomid() : \
|
|
htons(V_ip_id++))
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* !_NETINET_IP_VAR_H_ */
|