sctp_delayed_checksum() now handles unmapped mbufs, thanks to m_apply(). No functional change intended. Reviewed by: tuexen MFC after: 2 weeks Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D32942
1192 lines
30 KiB
C
1192 lines
30 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
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* Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org>
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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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* 1. 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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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* IPsec output processing.
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*/
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include "opt_sctp.h"
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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/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/errno.h>
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#include <sys/hhook.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <net/if_enc.h>
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#include <net/if_var.h>
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#include <net/vnet.h>
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#include <netinet/in.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/in_var.h>
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#include <netinet/ip_ecn.h>
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#ifdef INET6
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#include <netinet6/ip6_ecn.h>
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#endif
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#include <netinet/ip_icmp.h>
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#include <netinet/tcp_var.h>
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#include <netinet/ip6.h>
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#ifdef INET6
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#include <netinet6/ip6_var.h>
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#include <netinet6/scope6_var.h>
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#endif
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#include <netinet/in_pcb.h>
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#ifdef INET6
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#include <netinet/icmp6.h>
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#endif
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#if defined(SCTP) || defined(SCTP_SUPPORT)
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#include <netinet/sctp_crc32.h>
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#endif
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#include <netinet/udp.h>
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#include <netipsec/ah.h>
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#include <netipsec/esp.h>
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#include <netipsec/ipsec.h>
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#ifdef INET6
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#include <netipsec/ipsec6.h>
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#endif
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#include <netipsec/ah_var.h>
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#include <netipsec/esp_var.h>
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#include <netipsec/ipcomp_var.h>
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#include <netipsec/xform.h>
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#include <netipsec/key.h>
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#include <netipsec/keydb.h>
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#include <netipsec/key_debug.h>
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#include <machine/in_cksum.h>
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#define IPSEC_OSTAT_INC(proto, name) do { \
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if ((proto) == IPPROTO_ESP) \
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ESPSTAT_INC(esps_##name); \
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else if ((proto) == IPPROTO_AH)\
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AHSTAT_INC(ahs_##name); \
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else \
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IPCOMPSTAT_INC(ipcomps_##name); \
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} while (0)
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static int ipsec_encap(struct mbuf **mp, struct secasindex *saidx);
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static size_t ipsec_get_pmtu(struct secasvar *sav);
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#ifdef INET
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static struct secasvar *
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ipsec4_allocsa(struct mbuf *m, struct secpolicy *sp, u_int *pidx, int *error)
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{
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struct secasindex *saidx, tmpsaidx;
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struct ipsecrequest *isr;
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struct sockaddr_in *sin;
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struct secasvar *sav;
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struct ip *ip;
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/*
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* Check system global policy controls.
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*/
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next:
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isr = sp->req[*pidx];
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if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) ||
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(isr->saidx.proto == IPPROTO_AH && !V_ah_enable) ||
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(isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
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DPRINTF(("%s: IPsec outbound packet dropped due"
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" to policy (check your sysctls)\n", __func__));
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IPSEC_OSTAT_INC(isr->saidx.proto, pdrops);
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*error = EHOSTUNREACH;
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return (NULL);
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}
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/*
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* Craft SA index to search for proper SA. Note that
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* we only initialize unspecified SA peers for transport
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* mode; for tunnel mode they must already be filled in.
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*/
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if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
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saidx = &tmpsaidx;
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*saidx = isr->saidx;
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ip = mtod(m, struct ip *);
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if (saidx->src.sa.sa_len == 0) {
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sin = &saidx->src.sin;
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sin->sin_len = sizeof(*sin);
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sin->sin_family = AF_INET;
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sin->sin_port = IPSEC_PORT_ANY;
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sin->sin_addr = ip->ip_src;
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}
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if (saidx->dst.sa.sa_len == 0) {
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sin = &saidx->dst.sin;
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sin->sin_len = sizeof(*sin);
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sin->sin_family = AF_INET;
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sin->sin_port = IPSEC_PORT_ANY;
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sin->sin_addr = ip->ip_dst;
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}
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} else
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saidx = &sp->req[*pidx]->saidx;
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/*
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* Lookup SA and validate it.
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*/
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sav = key_allocsa_policy(sp, saidx, error);
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if (sav == NULL) {
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IPSECSTAT_INC(ips_out_nosa);
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if (*error != 0)
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return (NULL);
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if (ipsec_get_reqlevel(sp, *pidx) != IPSEC_LEVEL_REQUIRE) {
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/*
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* We have no SA and policy that doesn't require
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* this IPsec transform, thus we can continue w/o
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* IPsec processing, i.e. return EJUSTRETURN.
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* But first check if there is some bundled transform.
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*/
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if (sp->tcount > ++(*pidx))
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goto next;
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*error = EJUSTRETURN;
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}
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return (NULL);
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}
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IPSEC_ASSERT(sav->tdb_xform != NULL, ("SA with NULL tdb_xform"));
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return (sav);
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}
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/*
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* IPsec output logic for IPv4.
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*/
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static int
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ipsec4_perform_request(struct mbuf *m, struct secpolicy *sp,
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struct inpcb *inp, u_int idx)
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{
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struct ipsec_ctx_data ctx;
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union sockaddr_union *dst;
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struct secasvar *sav;
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struct ip *ip;
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int error, i, off;
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IPSEC_ASSERT(idx < sp->tcount, ("Wrong IPsec request index %d", idx));
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/*
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* We hold the reference to SP. Content of SP couldn't be changed.
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* Craft secasindex and do lookup for suitable SA.
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* Then do encapsulation if needed and call xform's output.
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* We need to store SP in the xform callback parameters.
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* In xform callback we will extract SP and it can be used to
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* determine next transform. At the end of transform we can
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* release reference to SP.
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*/
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sav = ipsec4_allocsa(m, sp, &idx, &error);
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if (sav == NULL) {
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if (error == EJUSTRETURN) { /* No IPsec required */
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key_freesp(&sp);
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return (error);
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}
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goto bad;
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}
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/*
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* XXXAE: most likely ip_sum at this point is wrong.
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*/
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IPSEC_INIT_CTX(&ctx, &m, inp, sav, AF_INET, IPSEC_ENC_BEFORE);
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if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_OUT)) != 0)
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goto bad;
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ip = mtod(m, struct ip *);
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dst = &sav->sah->saidx.dst;
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/* Do the appropriate encapsulation, if necessary */
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if (sp->req[idx]->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
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dst->sa.sa_family != AF_INET || /* PF mismatch */
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(dst->sa.sa_family == AF_INET && /* Proxy */
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dst->sin.sin_addr.s_addr != INADDR_ANY &&
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dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) {
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/* Fix IPv4 header checksum and length */
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ip->ip_len = htons(m->m_pkthdr.len);
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ip->ip_sum = 0;
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ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
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error = ipsec_encap(&m, &sav->sah->saidx);
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if (error != 0) {
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DPRINTF(("%s: encapsulation for SPI 0x%08x failed "
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"with error %d\n", __func__, ntohl(sav->spi),
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error));
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/* XXXAE: IPSEC_OSTAT_INC(tunnel); */
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goto bad;
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}
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inp = NULL;
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}
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IPSEC_INIT_CTX(&ctx, &m, inp, sav, dst->sa.sa_family, IPSEC_ENC_AFTER);
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if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_OUT)) != 0)
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goto bad;
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/*
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* Dispatch to the appropriate IPsec transform logic. The
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* packet will be returned for transmission after crypto
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* processing, etc. are completed.
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*
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* NB: m & sav are ``passed to caller'' who's responsible for
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* reclaiming their resources.
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*/
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switch(dst->sa.sa_family) {
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case AF_INET:
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ip = mtod(m, struct ip *);
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i = ip->ip_hl << 2;
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off = offsetof(struct ip, ip_p);
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break;
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#ifdef INET6
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case AF_INET6:
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i = sizeof(struct ip6_hdr);
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off = offsetof(struct ip6_hdr, ip6_nxt);
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break;
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#endif /* INET6 */
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default:
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DPRINTF(("%s: unsupported protocol family %u\n",
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__func__, dst->sa.sa_family));
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error = EPFNOSUPPORT;
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IPSEC_OSTAT_INC(sav->sah->saidx.proto, nopf);
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goto bad;
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}
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error = (*sav->tdb_xform->xf_output)(m, sp, sav, idx, i, off);
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return (error);
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bad:
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IPSECSTAT_INC(ips_out_inval);
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if (m != NULL)
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m_freem(m);
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if (sav != NULL)
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key_freesav(&sav);
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key_freesp(&sp);
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return (error);
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}
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int
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ipsec4_process_packet(struct mbuf *m, struct secpolicy *sp,
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struct inpcb *inp)
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{
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return (ipsec4_perform_request(m, sp, inp, 0));
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}
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int
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ipsec4_check_pmtu(struct mbuf *m, struct secpolicy *sp, int forwarding)
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{
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struct secasvar *sav;
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struct ip *ip;
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size_t hlen, pmtu;
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uint32_t idx;
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int error;
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/* Don't check PMTU if the frame won't have DF bit set. */
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if (!V_ip4_ipsec_dfbit)
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return (0);
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if (V_ip4_ipsec_dfbit == 1)
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goto setdf;
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/* V_ip4_ipsec_dfbit > 1 - we will copy it from inner header. */
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ip = mtod(m, struct ip *);
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if (!(ip->ip_off & htons(IP_DF)))
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return (0);
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setdf:
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idx = sp->tcount - 1;
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sav = ipsec4_allocsa(m, sp, &idx, &error);
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if (sav == NULL) {
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key_freesp(&sp);
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/*
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* No matching SA was found and SADB_ACQUIRE message was generated.
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* Since we have matched a SP to this packet drop it silently.
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*/
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if (error == 0)
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error = EINPROGRESS;
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if (error != EJUSTRETURN)
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m_freem(m);
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return (error);
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}
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pmtu = ipsec_get_pmtu(sav);
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if (pmtu == 0) {
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key_freesav(&sav);
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return (0);
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}
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hlen = ipsec_hdrsiz_internal(sp);
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key_freesav(&sav);
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if (m_length(m, NULL) + hlen > pmtu) {
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/*
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* If we're forwarding generate ICMP message here,
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* so that it contains pmtu subtracted by header size.
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* Set error to EINPROGRESS, in order for the frame
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* to be dropped silently.
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*/
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if (forwarding) {
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if (pmtu > hlen)
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icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG,
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0, pmtu - hlen);
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else
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m_freem(m);
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key_freesp(&sp);
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return (EINPROGRESS); /* Pretend that we consumed it. */
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} else {
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m_freem(m);
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key_freesp(&sp);
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return (EMSGSIZE);
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}
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}
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return (0);
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}
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|
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static int
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ipsec4_common_output(struct mbuf *m, struct inpcb *inp, int forwarding)
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{
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struct secpolicy *sp;
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int error;
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|
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/* Lookup for the corresponding outbound security policy */
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sp = ipsec4_checkpolicy(m, inp, &error, !forwarding);
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if (sp == NULL) {
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if (error == -EINVAL) {
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/* Discarded by policy. */
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m_freem(m);
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return (EACCES);
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}
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return (0); /* No IPsec required. */
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}
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|
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/*
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* Usually we have to have tunnel mode IPsec security policy
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* when we are forwarding a packet. Otherwise we could not handle
|
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* encrypted replies, because they are not destined for us. But
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* some users are doing source address translation for forwarded
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* packets, and thus, even if they are forwarded, the replies will
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* return back to us.
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*/
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if (!forwarding) {
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/*
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* Do delayed checksums now because we send before
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* this is done in the normal processing path.
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*/
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if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA) {
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m = mb_unmapped_to_ext(m);
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if (m == NULL) {
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IPSECSTAT_INC(ips_out_nomem);
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key_freesp(&sp);
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return (ENOBUFS);
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}
|
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in_delayed_cksum(m);
|
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m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
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}
|
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#if defined(SCTP) || defined(SCTP_SUPPORT)
|
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if (m->m_pkthdr.csum_flags & CSUM_SCTP) {
|
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struct ip *ip;
|
|
|
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ip = mtod(m, struct ip *);
|
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sctp_delayed_cksum(m, (uint32_t)(ip->ip_hl << 2));
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m->m_pkthdr.csum_flags &= ~CSUM_SCTP;
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}
|
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#endif
|
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}
|
|
/* NB: callee frees mbuf and releases reference to SP */
|
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error = ipsec4_check_pmtu(m, sp, forwarding);
|
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if (error != 0) {
|
|
if (error == EJUSTRETURN)
|
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return (0);
|
|
|
|
return (error);
|
|
}
|
|
|
|
error = ipsec4_process_packet(m, sp, inp);
|
|
if (error == EJUSTRETURN) {
|
|
/*
|
|
* We had a SP with a level of 'use' and no SA. We
|
|
* will just continue to process the packet without
|
|
* IPsec processing and return without error.
|
|
*/
|
|
return (0);
|
|
}
|
|
if (error == 0)
|
|
return (EINPROGRESS); /* consumed by IPsec */
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* IPSEC_OUTPUT() method implementation for IPv4.
|
|
* 0 - no IPsec handling needed
|
|
* other values - mbuf consumed by IPsec.
|
|
*/
|
|
int
|
|
ipsec4_output(struct mbuf *m, struct inpcb *inp)
|
|
{
|
|
|
|
/*
|
|
* If the packet is resubmitted to ip_output (e.g. after
|
|
* AH, ESP, etc. processing), there will be a tag to bypass
|
|
* the lookup and related policy checking.
|
|
*/
|
|
if (m_tag_find(m, PACKET_TAG_IPSEC_OUT_DONE, NULL) != NULL)
|
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return (0);
|
|
|
|
return (ipsec4_common_output(m, inp, 0));
|
|
}
|
|
|
|
/*
|
|
* IPSEC_FORWARD() method implementation for IPv4.
|
|
* 0 - no IPsec handling needed
|
|
* other values - mbuf consumed by IPsec.
|
|
*/
|
|
int
|
|
ipsec4_forward(struct mbuf *m)
|
|
{
|
|
|
|
/*
|
|
* Check if this packet has an active inbound SP and needs to be
|
|
* dropped instead of forwarded.
|
|
*/
|
|
if (ipsec4_in_reject(m, NULL) != 0) {
|
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m_freem(m);
|
|
return (EACCES);
|
|
}
|
|
return (ipsec4_common_output(m, NULL, 1));
|
|
}
|
|
#endif
|
|
|
|
#ifdef INET6
|
|
static int
|
|
in6_sa_equal_addrwithscope(const struct sockaddr_in6 *sa,
|
|
const struct in6_addr *ia)
|
|
{
|
|
struct in6_addr ia2;
|
|
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&sa->sin6_addr)) {
|
|
memcpy(&ia2, &sa->sin6_addr, sizeof(ia2));
|
|
ia2.s6_addr16[1] = htons(sa->sin6_scope_id);
|
|
return (IN6_ARE_ADDR_EQUAL(ia, &ia2));
|
|
}
|
|
return (IN6_ARE_ADDR_EQUAL(&sa->sin6_addr, ia));
|
|
}
|
|
|
|
static struct secasvar *
|
|
ipsec6_allocsa(struct mbuf *m, struct secpolicy *sp, u_int *pidx, int *error)
|
|
{
|
|
struct secasindex *saidx, tmpsaidx;
|
|
struct ipsecrequest *isr;
|
|
struct sockaddr_in6 *sin6;
|
|
struct secasvar *sav;
|
|
struct ip6_hdr *ip6;
|
|
|
|
/*
|
|
* Check system global policy controls.
|
|
*/
|
|
next:
|
|
isr = sp->req[*pidx];
|
|
if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) ||
|
|
(isr->saidx.proto == IPPROTO_AH && !V_ah_enable) ||
|
|
(isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
|
|
DPRINTF(("%s: IPsec outbound packet dropped due"
|
|
" to policy (check your sysctls)\n", __func__));
|
|
IPSEC_OSTAT_INC(isr->saidx.proto, pdrops);
|
|
*error = EHOSTUNREACH;
|
|
return (NULL);
|
|
}
|
|
/*
|
|
* Craft SA index to search for proper SA. Note that
|
|
* we only fillin unspecified SA peers for transport
|
|
* mode; for tunnel mode they must already be filled in.
|
|
*/
|
|
if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) {
|
|
saidx = &tmpsaidx;
|
|
*saidx = isr->saidx;
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
if (saidx->src.sin6.sin6_len == 0) {
|
|
sin6 = (struct sockaddr_in6 *)&saidx->src;
|
|
sin6->sin6_len = sizeof(*sin6);
|
|
sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_port = IPSEC_PORT_ANY;
|
|
sin6->sin6_addr = ip6->ip6_src;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) {
|
|
/* fix scope id for comparing SPD */
|
|
sin6->sin6_addr.s6_addr16[1] = 0;
|
|
sin6->sin6_scope_id =
|
|
ntohs(ip6->ip6_src.s6_addr16[1]);
|
|
}
|
|
}
|
|
if (saidx->dst.sin6.sin6_len == 0) {
|
|
sin6 = (struct sockaddr_in6 *)&saidx->dst;
|
|
sin6->sin6_len = sizeof(*sin6);
|
|
sin6->sin6_family = AF_INET6;
|
|
sin6->sin6_port = IPSEC_PORT_ANY;
|
|
sin6->sin6_addr = ip6->ip6_dst;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) {
|
|
/* fix scope id for comparing SPD */
|
|
sin6->sin6_addr.s6_addr16[1] = 0;
|
|
sin6->sin6_scope_id =
|
|
ntohs(ip6->ip6_dst.s6_addr16[1]);
|
|
}
|
|
}
|
|
} else
|
|
saidx = &sp->req[*pidx]->saidx;
|
|
/*
|
|
* Lookup SA and validate it.
|
|
*/
|
|
sav = key_allocsa_policy(sp, saidx, error);
|
|
if (sav == NULL) {
|
|
IPSEC6STAT_INC(ips_out_nosa);
|
|
if (*error != 0)
|
|
return (NULL);
|
|
if (ipsec_get_reqlevel(sp, *pidx) != IPSEC_LEVEL_REQUIRE) {
|
|
/*
|
|
* We have no SA and policy that doesn't require
|
|
* this IPsec transform, thus we can continue w/o
|
|
* IPsec processing, i.e. return EJUSTRETURN.
|
|
* But first check if there is some bundled transform.
|
|
*/
|
|
if (sp->tcount > ++(*pidx))
|
|
goto next;
|
|
*error = EJUSTRETURN;
|
|
}
|
|
return (NULL);
|
|
}
|
|
IPSEC_ASSERT(sav->tdb_xform != NULL, ("SA with NULL tdb_xform"));
|
|
return (sav);
|
|
}
|
|
|
|
/*
|
|
* IPsec output logic for IPv6.
|
|
*/
|
|
static int
|
|
ipsec6_perform_request(struct mbuf *m, struct secpolicy *sp,
|
|
struct inpcb *inp, u_int idx)
|
|
{
|
|
struct ipsec_ctx_data ctx;
|
|
union sockaddr_union *dst;
|
|
struct secasvar *sav;
|
|
struct ip6_hdr *ip6;
|
|
int error, i, off;
|
|
|
|
IPSEC_ASSERT(idx < sp->tcount, ("Wrong IPsec request index %d", idx));
|
|
|
|
sav = ipsec6_allocsa(m, sp, &idx, &error);
|
|
if (sav == NULL) {
|
|
if (error == EJUSTRETURN) { /* No IPsec required */
|
|
key_freesp(&sp);
|
|
return (error);
|
|
}
|
|
goto bad;
|
|
}
|
|
|
|
/* Fix IP length in case if it is not set yet. */
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(*ip6));
|
|
|
|
IPSEC_INIT_CTX(&ctx, &m, inp, sav, AF_INET6, IPSEC_ENC_BEFORE);
|
|
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_OUT)) != 0)
|
|
goto bad;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *); /* pfil can change mbuf */
|
|
dst = &sav->sah->saidx.dst;
|
|
|
|
/* Do the appropriate encapsulation, if necessary */
|
|
if (sp->req[idx]->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */
|
|
dst->sa.sa_family != AF_INET6 || /* PF mismatch */
|
|
((dst->sa.sa_family == AF_INET6) &&
|
|
(!IN6_IS_ADDR_UNSPECIFIED(&dst->sin6.sin6_addr)) &&
|
|
(!in6_sa_equal_addrwithscope(&dst->sin6, &ip6->ip6_dst)))) {
|
|
if (m->m_pkthdr.len - sizeof(*ip6) > IPV6_MAXPACKET) {
|
|
/* No jumbogram support. */
|
|
error = ENXIO; /*XXX*/
|
|
goto bad;
|
|
}
|
|
error = ipsec_encap(&m, &sav->sah->saidx);
|
|
if (error != 0) {
|
|
DPRINTF(("%s: encapsulation for SPI 0x%08x failed "
|
|
"with error %d\n", __func__, ntohl(sav->spi),
|
|
error));
|
|
/* XXXAE: IPSEC_OSTAT_INC(tunnel); */
|
|
goto bad;
|
|
}
|
|
inp = NULL;
|
|
}
|
|
|
|
IPSEC_INIT_CTX(&ctx, &m, inp, sav, dst->sa.sa_family, IPSEC_ENC_AFTER);
|
|
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_OUT)) != 0)
|
|
goto bad;
|
|
|
|
switch(dst->sa.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
{
|
|
struct ip *ip;
|
|
ip = mtod(m, struct ip *);
|
|
i = ip->ip_hl << 2;
|
|
off = offsetof(struct ip, ip_p);
|
|
}
|
|
break;
|
|
#endif /* AF_INET */
|
|
case AF_INET6:
|
|
i = sizeof(struct ip6_hdr);
|
|
off = offsetof(struct ip6_hdr, ip6_nxt);
|
|
break;
|
|
default:
|
|
DPRINTF(("%s: unsupported protocol family %u\n",
|
|
__func__, dst->sa.sa_family));
|
|
error = EPFNOSUPPORT;
|
|
IPSEC_OSTAT_INC(sav->sah->saidx.proto, nopf);
|
|
goto bad;
|
|
}
|
|
error = (*sav->tdb_xform->xf_output)(m, sp, sav, idx, i, off);
|
|
return (error);
|
|
bad:
|
|
IPSEC6STAT_INC(ips_out_inval);
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
if (sav != NULL)
|
|
key_freesav(&sav);
|
|
key_freesp(&sp);
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
ipsec6_process_packet(struct mbuf *m, struct secpolicy *sp,
|
|
struct inpcb *inp)
|
|
{
|
|
|
|
return (ipsec6_perform_request(m, sp, inp, 0));
|
|
}
|
|
|
|
/*
|
|
* IPv6 implementation is based on IPv4 implementation.
|
|
*/
|
|
int
|
|
ipsec6_check_pmtu(struct mbuf *m, struct secpolicy *sp, int forwarding)
|
|
{
|
|
struct secasvar *sav;
|
|
size_t hlen, pmtu;
|
|
uint32_t idx;
|
|
int error;
|
|
|
|
/*
|
|
* According to RFC8200 L3 fragmentation is supposed to be done only on
|
|
* locally generated packets. During L3 forwarding packets that are too
|
|
* big are always supposed to be dropped, with an ICMPv6 packet being
|
|
* sent back.
|
|
*/
|
|
if (!forwarding)
|
|
return (0);
|
|
|
|
idx = sp->tcount - 1;
|
|
sav = ipsec6_allocsa(m, sp, &idx, &error);
|
|
if (sav == NULL) {
|
|
key_freesp(&sp);
|
|
/*
|
|
* No matching SA was found and SADB_ACQUIRE message was generated.
|
|
* Since we have matched a SP to this packet drop it silently.
|
|
*/
|
|
if (error == 0)
|
|
error = EINPROGRESS;
|
|
if (error != EJUSTRETURN)
|
|
m_freem(m);
|
|
|
|
return (error);
|
|
}
|
|
|
|
pmtu = ipsec_get_pmtu(sav);
|
|
if (pmtu == 0) {
|
|
key_freesav(&sav);
|
|
return (0);
|
|
}
|
|
|
|
hlen = ipsec_hdrsiz_internal(sp);
|
|
key_freesav(&sav);
|
|
|
|
if (m_length(m, NULL) + hlen > pmtu) {
|
|
/*
|
|
* If we're forwarding generate ICMPv6 message here,
|
|
* so that it contains pmtu subtracted by header size.
|
|
* Set error to EINPROGRESS, in order for the frame
|
|
* to be dropped silently.
|
|
*/
|
|
if (forwarding) {
|
|
if (pmtu > hlen)
|
|
icmp6_error(m, ICMP6_PACKET_TOO_BIG, 0, pmtu - hlen);
|
|
else
|
|
m_freem(m);
|
|
|
|
key_freesp(&sp);
|
|
return (EINPROGRESS); /* Pretend that we consumed it. */
|
|
}
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ipsec6_common_output(struct mbuf *m, struct inpcb *inp, int forwarding)
|
|
{
|
|
struct secpolicy *sp;
|
|
int error;
|
|
|
|
/* Lookup for the corresponding outbound security policy */
|
|
sp = ipsec6_checkpolicy(m, inp, &error, !forwarding);
|
|
if (sp == NULL) {
|
|
if (error == -EINVAL) {
|
|
/* Discarded by policy. */
|
|
m_freem(m);
|
|
return (EACCES);
|
|
}
|
|
return (0); /* No IPsec required. */
|
|
}
|
|
|
|
if (!forwarding) {
|
|
/*
|
|
* Do delayed checksums now because we send before
|
|
* this is done in the normal processing path.
|
|
*/
|
|
if (m->m_pkthdr.csum_flags & CSUM_DELAY_DATA_IPV6) {
|
|
m = mb_unmapped_to_ext(m);
|
|
if (m == NULL) {
|
|
IPSEC6STAT_INC(ips_out_nomem);
|
|
key_freesp(&sp);
|
|
return (ENOBUFS);
|
|
}
|
|
in6_delayed_cksum(m, m->m_pkthdr.len -
|
|
sizeof(struct ip6_hdr), sizeof(struct ip6_hdr));
|
|
m->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA_IPV6;
|
|
}
|
|
#if defined(SCTP) || defined(SCTP_SUPPORT)
|
|
if (m->m_pkthdr.csum_flags & CSUM_SCTP_IPV6) {
|
|
sctp_delayed_cksum(m, sizeof(struct ip6_hdr));
|
|
m->m_pkthdr.csum_flags &= ~CSUM_SCTP_IPV6;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
error = ipsec6_check_pmtu(m, sp, forwarding);
|
|
if (error != 0) {
|
|
if (error == EJUSTRETURN)
|
|
return (0);
|
|
|
|
return (error);
|
|
}
|
|
|
|
/* NB: callee frees mbuf and releases reference to SP */
|
|
error = ipsec6_process_packet(m, sp, inp);
|
|
if (error == EJUSTRETURN) {
|
|
/*
|
|
* We had a SP with a level of 'use' and no SA. We
|
|
* will just continue to process the packet without
|
|
* IPsec processing and return without error.
|
|
*/
|
|
return (0);
|
|
}
|
|
if (error == 0)
|
|
return (EINPROGRESS); /* consumed by IPsec */
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* IPSEC_OUTPUT() method implementation for IPv6.
|
|
* 0 - no IPsec handling needed
|
|
* other values - mbuf consumed by IPsec.
|
|
*/
|
|
int
|
|
ipsec6_output(struct mbuf *m, struct inpcb *inp)
|
|
{
|
|
|
|
/*
|
|
* If the packet is resubmitted to ip_output (e.g. after
|
|
* AH, ESP, etc. processing), there will be a tag to bypass
|
|
* the lookup and related policy checking.
|
|
*/
|
|
if (m_tag_find(m, PACKET_TAG_IPSEC_OUT_DONE, NULL) != NULL)
|
|
return (0);
|
|
|
|
return (ipsec6_common_output(m, inp, 0));
|
|
}
|
|
|
|
/*
|
|
* IPSEC_FORWARD() method implementation for IPv6.
|
|
* 0 - no IPsec handling needed
|
|
* other values - mbuf consumed by IPsec.
|
|
*/
|
|
int
|
|
ipsec6_forward(struct mbuf *m)
|
|
{
|
|
|
|
/*
|
|
* Check if this packet has an active inbound SP and needs to be
|
|
* dropped instead of forwarded.
|
|
*/
|
|
if (ipsec6_in_reject(m, NULL) != 0) {
|
|
m_freem(m);
|
|
return (EACCES);
|
|
}
|
|
return (ipsec6_common_output(m, NULL, 1));
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
int
|
|
ipsec_process_done(struct mbuf *m, struct secpolicy *sp, struct secasvar *sav,
|
|
u_int idx)
|
|
{
|
|
struct epoch_tracker et;
|
|
struct xform_history *xh;
|
|
struct secasindex *saidx;
|
|
struct m_tag *mtag;
|
|
int error;
|
|
|
|
saidx = &sav->sah->saidx;
|
|
switch (saidx->dst.sa.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
/* Fix the header length, for AH processing. */
|
|
mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
/* Fix the header length, for AH processing. */
|
|
if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) {
|
|
error = ENXIO;
|
|
goto bad;
|
|
}
|
|
if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) {
|
|
/* No jumbogram support. */
|
|
error = ENXIO; /*?*/
|
|
goto bad;
|
|
}
|
|
mtod(m, struct ip6_hdr *)->ip6_plen =
|
|
htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
DPRINTF(("%s: unknown protocol family %u\n", __func__,
|
|
saidx->dst.sa.sa_family));
|
|
error = ENXIO;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Add a record of what we've done to the packet.
|
|
*/
|
|
mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, sizeof(*xh), M_NOWAIT);
|
|
if (mtag == NULL) {
|
|
DPRINTF(("%s: could not get packet tag\n", __func__));
|
|
error = ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
xh = (struct xform_history *)(mtag + 1);
|
|
xh->dst = saidx->dst;
|
|
xh->proto = saidx->proto;
|
|
xh->mode = saidx->mode;
|
|
xh->spi = sav->spi;
|
|
m_tag_prepend(m, mtag);
|
|
|
|
key_sa_recordxfer(sav, m); /* record data transfer */
|
|
|
|
/*
|
|
* If there's another (bundled) SA to apply, do so.
|
|
* Note that this puts a burden on the kernel stack size.
|
|
* If this is a problem we'll need to introduce a queue
|
|
* to set the packet on so we can unwind the stack before
|
|
* doing further processing.
|
|
*/
|
|
if (++idx < sp->tcount) {
|
|
switch (saidx->dst.sa.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
key_freesav(&sav);
|
|
IPSECSTAT_INC(ips_out_bundlesa);
|
|
return (ipsec4_perform_request(m, sp, NULL, idx));
|
|
/* NOTREACHED */
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
key_freesav(&sav);
|
|
IPSEC6STAT_INC(ips_out_bundlesa);
|
|
return (ipsec6_perform_request(m, sp, NULL, idx));
|
|
/* NOTREACHED */
|
|
#endif /* INET6 */
|
|
default:
|
|
DPRINTF(("%s: unknown protocol family %u\n", __func__,
|
|
saidx->dst.sa.sa_family));
|
|
error = EPFNOSUPPORT;
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
key_freesp(&sp), sp = NULL; /* Release reference to SP */
|
|
#ifdef INET
|
|
/*
|
|
* Do UDP encapsulation if SA requires it.
|
|
*/
|
|
if (sav->natt != NULL) {
|
|
error = udp_ipsec_output(m, sav);
|
|
if (error != 0)
|
|
goto bad;
|
|
}
|
|
#endif /* INET */
|
|
/*
|
|
* We're done with IPsec processing, transmit the packet using the
|
|
* appropriate network protocol (IP or IPv6).
|
|
*/
|
|
NET_EPOCH_ENTER(et);
|
|
switch (saidx->dst.sa.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
key_freesav(&sav);
|
|
error = ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
key_freesav(&sav);
|
|
error = ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
panic("ipsec_process_done");
|
|
}
|
|
NET_EPOCH_EXIT(et);
|
|
return (error);
|
|
bad:
|
|
m_freem(m);
|
|
key_freesav(&sav);
|
|
if (sp != NULL)
|
|
key_freesp(&sp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* ipsec_prepend() is optimized version of M_PREPEND().
|
|
* ipsec_encap() is called by IPsec output routine for tunnel mode SA.
|
|
* It is expected that after IP encapsulation some IPsec transform will
|
|
* be performed. Each IPsec transform inserts its variable length header
|
|
* just after outer IP header using m_makespace(). If given mbuf has not
|
|
* enough free space at the beginning, we allocate new mbuf and reserve
|
|
* some space at the beginning and at the end.
|
|
* This helps avoid allocating of new mbuf and data copying in m_makespace(),
|
|
* we place outer header in the middle of mbuf's data with reserved leading
|
|
* and trailing space:
|
|
* [ LEADINGSPACE ][ Outer IP header ][ TRAILINGSPACE ]
|
|
* LEADINGSPACE will be used to add ethernet header, TRAILINGSPACE will
|
|
* be used to inject AH/ESP/IPCOMP header.
|
|
*/
|
|
#define IPSEC_TRAILINGSPACE (sizeof(struct udphdr) +/* NAT-T */ \
|
|
max(sizeof(struct newesp) + EALG_MAX_BLOCK_LEN, /* ESP + IV */ \
|
|
sizeof(struct newah) + HASH_MAX_LEN /* AH + ICV */))
|
|
static struct mbuf *
|
|
ipsec_prepend(struct mbuf *m, int len, int how)
|
|
{
|
|
struct mbuf *n;
|
|
|
|
M_ASSERTPKTHDR(m);
|
|
IPSEC_ASSERT(len < MHLEN, ("wrong length"));
|
|
if (M_LEADINGSPACE(m) >= len) {
|
|
/* No need to allocate new mbuf. */
|
|
m->m_data -= len;
|
|
m->m_len += len;
|
|
m->m_pkthdr.len += len;
|
|
return (m);
|
|
}
|
|
n = m_gethdr(how, m->m_type);
|
|
if (n == NULL) {
|
|
m_freem(m);
|
|
return (NULL);
|
|
}
|
|
m_move_pkthdr(n, m);
|
|
n->m_next = m;
|
|
if (len + IPSEC_TRAILINGSPACE < M_SIZE(n))
|
|
m_align(n, len + IPSEC_TRAILINGSPACE);
|
|
n->m_len = len;
|
|
n->m_pkthdr.len += len;
|
|
return (n);
|
|
}
|
|
|
|
static size_t
|
|
ipsec_get_pmtu(struct secasvar *sav)
|
|
{
|
|
union sockaddr_union *dst;
|
|
struct in_conninfo inc;
|
|
size_t pmtu;
|
|
|
|
dst = &sav->sah->saidx.dst;
|
|
memset(&inc, 0, sizeof(inc));
|
|
|
|
switch (dst->sa.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
inc.inc_faddr = satosin(&dst->sa)->sin_addr;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
inc.inc6_faddr = satosin6(&dst->sa)->sin6_addr;
|
|
inc.inc_flags |= INC_ISIPV6;
|
|
break;
|
|
#endif
|
|
default:
|
|
return (0);
|
|
}
|
|
|
|
pmtu = tcp_hc_getmtu(&inc);
|
|
if (pmtu != 0)
|
|
return (pmtu);
|
|
|
|
/* No entry in hostcache. Assume that PMTU is equal to link's MTU */
|
|
switch (dst->sa.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
pmtu = tcp_maxmtu(&inc, NULL);
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
pmtu = tcp_maxmtu6(&inc, NULL);
|
|
break;
|
|
#endif
|
|
default:
|
|
return (0);
|
|
}
|
|
if (pmtu == 0)
|
|
return (0);
|
|
|
|
tcp_hc_updatemtu(&inc, pmtu);
|
|
|
|
return (pmtu);
|
|
}
|
|
|
|
static int
|
|
ipsec_encap(struct mbuf **mp, struct secasindex *saidx)
|
|
{
|
|
#ifdef INET6
|
|
struct ip6_hdr *ip6;
|
|
#endif
|
|
struct ip *ip;
|
|
int setdf;
|
|
uint8_t itos, proto;
|
|
|
|
ip = mtod(*mp, struct ip *);
|
|
switch (ip->ip_v) {
|
|
#ifdef INET
|
|
case IPVERSION:
|
|
proto = IPPROTO_IPIP;
|
|
/*
|
|
* Collect IP_DF state from the inner header
|
|
* and honor system-wide control of how to handle it.
|
|
*/
|
|
switch (V_ip4_ipsec_dfbit) {
|
|
case 0: /* clear in outer header */
|
|
case 1: /* set in outer header */
|
|
setdf = V_ip4_ipsec_dfbit;
|
|
break;
|
|
default:/* propagate to outer header */
|
|
setdf = (ip->ip_off & htons(IP_DF)) != 0;
|
|
}
|
|
itos = ip->ip_tos;
|
|
break;
|
|
#endif
|
|
#ifdef INET6
|
|
case (IPV6_VERSION >> 4):
|
|
proto = IPPROTO_IPV6;
|
|
ip6 = mtod(*mp, struct ip6_hdr *);
|
|
itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
|
|
setdf = V_ip4_ipsec_dfbit ? 1: 0;
|
|
/* scoped address handling */
|
|
in6_clearscope(&ip6->ip6_src);
|
|
in6_clearscope(&ip6->ip6_dst);
|
|
break;
|
|
#endif
|
|
default:
|
|
return (EAFNOSUPPORT);
|
|
}
|
|
switch (saidx->dst.sa.sa_family) {
|
|
#ifdef INET
|
|
case AF_INET:
|
|
if (saidx->src.sa.sa_family != AF_INET ||
|
|
saidx->src.sin.sin_addr.s_addr == INADDR_ANY ||
|
|
saidx->dst.sin.sin_addr.s_addr == INADDR_ANY)
|
|
return (EINVAL);
|
|
*mp = ipsec_prepend(*mp, sizeof(struct ip), M_NOWAIT);
|
|
if (*mp == NULL)
|
|
return (ENOBUFS);
|
|
ip = mtod(*mp, struct ip *);
|
|
ip->ip_v = IPVERSION;
|
|
ip->ip_hl = sizeof(struct ip) >> 2;
|
|
ip->ip_p = proto;
|
|
ip->ip_len = htons((*mp)->m_pkthdr.len);
|
|
ip->ip_ttl = V_ip_defttl;
|
|
ip->ip_sum = 0;
|
|
ip->ip_off = setdf ? htons(IP_DF): 0;
|
|
ip->ip_src = saidx->src.sin.sin_addr;
|
|
ip->ip_dst = saidx->dst.sin.sin_addr;
|
|
ip_ecn_ingress(V_ip4_ipsec_ecn, &ip->ip_tos, &itos);
|
|
ip_fillid(ip);
|
|
break;
|
|
#endif /* INET */
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
if (saidx->src.sa.sa_family != AF_INET6 ||
|
|
IN6_IS_ADDR_UNSPECIFIED(&saidx->src.sin6.sin6_addr) ||
|
|
IN6_IS_ADDR_UNSPECIFIED(&saidx->dst.sin6.sin6_addr))
|
|
return (EINVAL);
|
|
*mp = ipsec_prepend(*mp, sizeof(struct ip6_hdr), M_NOWAIT);
|
|
if (*mp == NULL)
|
|
return (ENOBUFS);
|
|
ip6 = mtod(*mp, struct ip6_hdr *);
|
|
ip6->ip6_flow = 0;
|
|
ip6->ip6_vfc = IPV6_VERSION;
|
|
ip6->ip6_hlim = V_ip6_defhlim;
|
|
ip6->ip6_nxt = proto;
|
|
ip6->ip6_dst = saidx->dst.sin6.sin6_addr;
|
|
/* For link-local address embed scope zone id */
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
|
|
ip6->ip6_dst.s6_addr16[1] =
|
|
htons(saidx->dst.sin6.sin6_scope_id & 0xffff);
|
|
ip6->ip6_src = saidx->src.sin6.sin6_addr;
|
|
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
|
|
ip6->ip6_src.s6_addr16[1] =
|
|
htons(saidx->src.sin6.sin6_scope_id & 0xffff);
|
|
ip6->ip6_plen = htons((*mp)->m_pkthdr.len - sizeof(*ip6));
|
|
ip_ecn_ingress(V_ip6_ipsec_ecn, &proto, &itos);
|
|
ip6->ip6_flow |= htonl((uint32_t)proto << 20);
|
|
break;
|
|
#endif /* INET6 */
|
|
default:
|
|
return (EAFNOSUPPORT);
|
|
}
|
|
(*mp)->m_flags &= ~(M_BCAST | M_MCAST);
|
|
return (0);
|
|
}
|