In the original design of the network stack from the protocol control input method pr_ctlinput was used notify the protocols about two very different kinds of events: internal system events and receival of an ICMP messages from outside. These events were coded with PRC_ codes. Today these methods are removed from the protosw(9) and are isolated to IPv4 and IPv6 stacks and are called only from icmp*_input(). The PRC_ codes now just create a shim layer between ICMP codes and errors or actions taken by protocols. - Change ipproto_ctlinput_t to pass just pointer to ICMP header. This allows protocols to not deduct it from the internal IP header. - Change ip6proto_ctlinput_t to pass just struct ip6ctlparam pointer. It has all the information needed to the protocols. In the structure, change ip6c_finaldst fields to sockaddr_in6. The reason is that icmp6_input() already has this address wrapped in sockaddr, and the protocols want this address as sockaddr. - For UDP tunneling control input, as well as for IPSEC control input, change the prototypes to accept a transparent union of either ICMP header pointer or struct ip6ctlparam pointer. - In icmp_input() and icmp6_input() do only validation of ICMP header and count bad packets. The translation of ICMP codes to errors/actions is done by protocols. - Provide icmp_errmap() and icmp6_errmap() as substitute to inetctlerrmap, inet6ctlerrmap arrays. - In protocol ctlinput methods either trust what icmp_errmap() recommend, or do our own logic based on the ICMP header. Differential revision: https://reviews.freebsd.org/D36731
776 lines
19 KiB
C
776 lines
19 KiB
C
/* $OpenBSD: ipsec_input.c,v 1.63 2003/02/20 18:35:43 deraadt Exp $ */
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/*-
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* The authors of this code are John Ioannidis (ji@tla.org),
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* Angelos D. Keromytis (kermit@csd.uch.gr) and
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* Niels Provos (provos@physnet.uni-hamburg.de).
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*
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* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
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* in November 1995.
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*
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* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
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* by Angelos D. Keromytis.
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*
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* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
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* and Niels Provos.
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*
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* Additional features in 1999 by Angelos D. Keromytis.
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*
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* Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
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* Angelos D. Keromytis and Niels Provos.
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* Copyright (c) 2001, Angelos D. Keromytis.
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* Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org>
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*
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* Permission to use, copy, and modify this software with or without fee
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* is hereby granted, provided that this entire notice is included in
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* all copies of any software which is or includes a copy or
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* modification of this software.
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* You may use this code under the GNU public license if you so wish. Please
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* contribute changes back to the authors under this freer than GPL license
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* so that we may further the use of strong encryption without limitations to
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* all.
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*
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* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
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* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
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* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
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* PURPOSE.
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*/
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/*
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* IPsec input processing.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.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_var.h>
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#include <net/if_enc.h>
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#include <net/netisr.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/ip_icmp.h>
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#include <netinet/in_var.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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#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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#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/ipsec_support.h>
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#include <netipsec/ah_var.h>
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#include <netipsec/esp.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/key.h>
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#include <netipsec/keydb.h>
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#include <netipsec/key_debug.h>
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#include <netipsec/xform.h>
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#include <machine/in_cksum.h>
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#include <machine/stdarg.h>
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#define IPSEC_ISTAT(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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/*
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* ipsec_common_input gets called when an IPsec-protected packet
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* is received by IPv4 or IPv6. Its job is to find the right SA
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* and call the appropriate transform. The transform callback
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* takes care of further processing (like ingress filtering).
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*/
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static int
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ipsec_common_input(struct mbuf *m, int skip, int protoff, int af, int sproto)
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{
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IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
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union sockaddr_union dst_address;
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struct secasvar *sav;
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uint32_t spi;
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int error;
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IPSEC_ISTAT(sproto, input);
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IPSEC_ASSERT(m != NULL, ("null packet"));
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IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
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sproto == IPPROTO_IPCOMP,
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("unexpected security protocol %u", sproto));
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if ((sproto == IPPROTO_ESP && !V_esp_enable) ||
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(sproto == IPPROTO_AH && !V_ah_enable) ||
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(sproto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
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m_freem(m);
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IPSEC_ISTAT(sproto, pdrops);
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return EOPNOTSUPP;
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}
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if (m->m_pkthdr.len - skip < 2 * sizeof (u_int32_t)) {
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m_freem(m);
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IPSEC_ISTAT(sproto, hdrops);
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DPRINTF(("%s: packet too small\n", __func__));
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return EINVAL;
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}
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/* Retrieve the SPI from the relevant IPsec header */
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if (sproto == IPPROTO_ESP)
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m_copydata(m, skip, sizeof(u_int32_t), (caddr_t) &spi);
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else if (sproto == IPPROTO_AH)
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m_copydata(m, skip + sizeof(u_int32_t), sizeof(u_int32_t),
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(caddr_t) &spi);
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else if (sproto == IPPROTO_IPCOMP) {
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u_int16_t cpi;
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m_copydata(m, skip + sizeof(u_int16_t), sizeof(u_int16_t),
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(caddr_t) &cpi);
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spi = ntohl(htons(cpi));
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}
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/*
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* Find the SA and (indirectly) call the appropriate
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* kernel crypto routine. The resulting mbuf chain is a valid
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* IP packet ready to go through input processing.
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*/
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bzero(&dst_address, sizeof (dst_address));
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dst_address.sa.sa_family = af;
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switch (af) {
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#ifdef INET
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case AF_INET:
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dst_address.sin.sin_len = sizeof(struct sockaddr_in);
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m_copydata(m, offsetof(struct ip, ip_dst),
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sizeof(struct in_addr),
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(caddr_t) &dst_address.sin.sin_addr);
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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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dst_address.sin6.sin6_len = sizeof(struct sockaddr_in6);
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m_copydata(m, offsetof(struct ip6_hdr, ip6_dst),
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sizeof(struct in6_addr),
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(caddr_t) &dst_address.sin6.sin6_addr);
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/* We keep addresses in SADB without embedded scope id */
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if (IN6_IS_SCOPE_LINKLOCAL(&dst_address.sin6.sin6_addr)) {
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/* XXX: sa6_recoverscope() */
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dst_address.sin6.sin6_scope_id =
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ntohs(dst_address.sin6.sin6_addr.s6_addr16[1]);
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dst_address.sin6.sin6_addr.s6_addr16[1] = 0;
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}
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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", __func__, af));
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m_freem(m);
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IPSEC_ISTAT(sproto, nopf);
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return EPFNOSUPPORT;
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}
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/* NB: only pass dst since key_allocsa follows RFC2401 */
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sav = key_allocsa(&dst_address, sproto, spi);
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if (sav == NULL) {
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DPRINTF(("%s: no key association found for SA %s/%08lx/%u\n",
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__func__, ipsec_address(&dst_address, buf, sizeof(buf)),
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(u_long) ntohl(spi), sproto));
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IPSEC_ISTAT(sproto, notdb);
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m_freem(m);
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return ENOENT;
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}
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if (sav->tdb_xform == NULL) {
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DPRINTF(("%s: attempted to use uninitialized SA %s/%08lx/%u\n",
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__func__, ipsec_address(&dst_address, buf, sizeof(buf)),
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(u_long) ntohl(spi), sproto));
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IPSEC_ISTAT(sproto, noxform);
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key_freesav(&sav);
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m_freem(m);
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return ENXIO;
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}
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/*
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* Call appropriate transform and return -- callback takes care of
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* everything else.
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*/
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error = (*sav->tdb_xform->xf_input)(m, sav, skip, protoff);
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return (error);
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}
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#ifdef INET
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/*
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* IPSEC_INPUT() method implementation for IPv4.
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* 0 - Permitted by inbound security policy for further processing.
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* EACCES - Forbidden by inbound security policy.
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* EINPROGRESS - consumed by IPsec.
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*/
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int
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ipsec4_input(struct mbuf *m, int offset, int proto)
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{
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switch (proto) {
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case IPPROTO_AH:
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case IPPROTO_ESP:
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case IPPROTO_IPCOMP:
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/* Do inbound IPsec processing for AH/ESP/IPCOMP */
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ipsec_common_input(m, offset,
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offsetof(struct ip, ip_p), AF_INET, proto);
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return (EINPROGRESS); /* mbuf consumed by IPsec */
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default:
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/*
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* Protocols with further headers get their IPsec treatment
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* within the protocol specific processing.
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*/
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switch (proto) {
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case IPPROTO_ICMP:
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case IPPROTO_IGMP:
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case IPPROTO_IPV4:
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case IPPROTO_IPV6:
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case IPPROTO_RSVP:
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case IPPROTO_GRE:
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case IPPROTO_MOBILE:
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case IPPROTO_ETHERIP:
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case IPPROTO_PIM:
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case IPPROTO_SCTP:
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break;
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default:
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return (0);
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}
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};
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/*
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* Enforce IPsec policy checking if we are seeing last header.
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*/
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if (ipsec4_in_reject(m, NULL) != 0) {
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/* Forbidden by inbound security policy */
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m_freem(m);
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return (EACCES);
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}
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return (0);
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}
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int
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ipsec4_ctlinput(ipsec_ctlinput_param_t param)
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{
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struct icmp *icp = param.icmp;
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struct ip *ip = &icp->icmp_ip;
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struct sockaddr_in icmpsrc = {
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.sin_len = sizeof(struct sockaddr_in),
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.sin_family = AF_INET,
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.sin_addr = ip->ip_dst,
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};
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struct in_conninfo inc;
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struct secasvar *sav;
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uint32_t pmtu, spi;
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uint32_t max_pmtu;
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uint8_t proto;
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pmtu = ntohs(icp->icmp_nextmtu);
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if (pmtu < V_ip4_ipsec_min_pmtu)
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return (EINVAL);
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proto = ip->ip_p;
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if (proto != IPPROTO_ESP && proto != IPPROTO_AH &&
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proto != IPPROTO_IPCOMP)
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return (EINVAL);
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memcpy(&spi, (caddr_t)ip + (ip->ip_hl << 2), sizeof(spi));
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sav = key_allocsa((union sockaddr_union *)&icmpsrc, proto, spi);
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if (sav == NULL)
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return (ENOENT);
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key_freesav(&sav);
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memset(&inc, 0, sizeof(inc));
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inc.inc_faddr = ip->ip_dst;
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/* Update pmtu only if its smaller than the current one. */
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max_pmtu = tcp_hc_getmtu(&inc);
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if (max_pmtu == 0)
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max_pmtu = tcp_maxmtu(&inc, NULL);
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if (pmtu < max_pmtu)
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tcp_hc_updatemtu(&inc, pmtu);
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return (0);
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}
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/*
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* IPsec input callback for INET protocols.
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* This routine is called as the transform callback.
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* Takes care of filtering and other sanity checks on
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* the processed packet.
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*/
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int
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ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip,
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int protoff)
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{
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IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
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struct epoch_tracker et;
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struct ipsec_ctx_data ctx;
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struct xform_history *xh;
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struct secasindex *saidx;
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struct m_tag *mtag;
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struct ip *ip;
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int error, prot, af, sproto, isr_prot;
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IPSEC_ASSERT(sav != NULL, ("null SA"));
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IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
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saidx = &sav->sah->saidx;
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af = saidx->dst.sa.sa_family;
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IPSEC_ASSERT(af == AF_INET, ("unexpected af %u", af));
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sproto = saidx->proto;
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IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
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sproto == IPPROTO_IPCOMP,
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("unexpected security protocol %u", sproto));
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if (skip != 0) {
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/*
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* Fix IPv4 header
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*/
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if (m->m_len < skip && (m = m_pullup(m, skip)) == NULL) {
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DPRINTF(("%s: processing failed for SA %s/%08lx\n",
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__func__, ipsec_address(&sav->sah->saidx.dst,
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buf, sizeof(buf)), (u_long) ntohl(sav->spi)));
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IPSEC_ISTAT(sproto, hdrops);
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error = ENOBUFS;
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goto bad_noepoch;
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}
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ip = mtod(m, struct ip *);
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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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} else {
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ip = mtod(m, struct ip *);
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}
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prot = ip->ip_p;
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/*
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* Check that we have NAT-T enabled and apply transport mode
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* decapsulation NAT procedure (RFC3948).
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* Do this before invoking into the PFIL.
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*/
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if (sav->natt != NULL &&
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(prot == IPPROTO_UDP || prot == IPPROTO_TCP))
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udp_ipsec_adjust_cksum(m, sav, prot, skip);
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/*
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* Needed for ipsec_run_hooks and netisr_queue_src
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*/
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NET_EPOCH_ENTER(et);
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IPSEC_INIT_CTX(&ctx, &m, NULL, sav, AF_INET, IPSEC_ENC_BEFORE);
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if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0)
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goto bad;
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ip = mtod(m, struct ip *); /* update pointer */
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/* IP-in-IP encapsulation */
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if (prot == IPPROTO_IPIP &&
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saidx->mode != IPSEC_MODE_TRANSPORT) {
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if (m->m_pkthdr.len - skip < sizeof(struct ip)) {
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IPSEC_ISTAT(sproto, hdrops);
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error = EINVAL;
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goto bad;
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}
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/* enc0: strip outer IPv4 header */
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m_striphdr(m, 0, ip->ip_hl << 2);
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}
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#ifdef INET6
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/* IPv6-in-IP encapsulation. */
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else if (prot == IPPROTO_IPV6 &&
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saidx->mode != IPSEC_MODE_TRANSPORT) {
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if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) {
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IPSEC_ISTAT(sproto, hdrops);
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error = EINVAL;
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goto bad;
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}
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/* enc0: strip IPv4 header, keep IPv6 header only */
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m_striphdr(m, 0, ip->ip_hl << 2);
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}
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#endif /* INET6 */
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else if (prot != IPPROTO_IPV6 && saidx->mode == IPSEC_MODE_ANY) {
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/*
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* When mode is wildcard, inner protocol is IPv6 and
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* we have no INET6 support - drop this packet a bit later.
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* In other cases we assume transport mode. Set prot to
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* correctly choose netisr.
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*/
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prot = IPPROTO_IPIP;
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}
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/*
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* Record what we've done to the packet (under what SA it was
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* processed).
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*/
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if (sproto != IPPROTO_IPCOMP) {
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mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE,
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sizeof(struct xform_history), M_NOWAIT);
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if (mtag == NULL) {
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DPRINTF(("%s: failed to get tag\n", __func__));
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IPSEC_ISTAT(sproto, hdrops);
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error = ENOMEM;
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goto bad;
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}
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xh = (struct xform_history *)(mtag + 1);
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bcopy(&saidx->dst, &xh->dst, saidx->dst.sa.sa_len);
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xh->spi = sav->spi;
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xh->proto = sproto;
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xh->mode = saidx->mode;
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m_tag_prepend(m, mtag);
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}
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key_sa_recordxfer(sav, m); /* record data transfer */
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/*
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* In transport mode requeue decrypted mbuf back to IPv4 protocol
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* handler. This is necessary to correctly expose rcvif.
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*/
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if (saidx->mode == IPSEC_MODE_TRANSPORT)
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prot = IPPROTO_IPIP;
|
|
/*
|
|
* Re-dispatch via software interrupt.
|
|
*/
|
|
switch (prot) {
|
|
case IPPROTO_IPIP:
|
|
isr_prot = NETISR_IP;
|
|
af = AF_INET;
|
|
break;
|
|
#ifdef INET6
|
|
case IPPROTO_IPV6:
|
|
isr_prot = NETISR_IPV6;
|
|
af = AF_INET6;
|
|
break;
|
|
#endif
|
|
default:
|
|
DPRINTF(("%s: cannot handle inner ip proto %d\n",
|
|
__func__, prot));
|
|
IPSEC_ISTAT(sproto, nopf);
|
|
error = EPFNOSUPPORT;
|
|
goto bad;
|
|
}
|
|
|
|
IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_AFTER);
|
|
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0)
|
|
goto bad;
|
|
|
|
/* Handle virtual tunneling interfaces */
|
|
if (saidx->mode == IPSEC_MODE_TUNNEL)
|
|
error = ipsec_if_input(m, sav, af);
|
|
if (error == 0) {
|
|
error = netisr_queue_src(isr_prot, (uintptr_t)sav->spi, m);
|
|
if (error) {
|
|
IPSEC_ISTAT(sproto, qfull);
|
|
DPRINTF(("%s: queue full; proto %u packet dropped\n",
|
|
__func__, sproto));
|
|
}
|
|
}
|
|
NET_EPOCH_EXIT(et);
|
|
key_freesav(&sav);
|
|
return (error);
|
|
bad:
|
|
NET_EPOCH_EXIT(et);
|
|
bad_noepoch:
|
|
key_freesav(&sav);
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
#endif /* INET */
|
|
|
|
#ifdef INET6
|
|
static bool
|
|
ipsec6_lasthdr(int proto)
|
|
{
|
|
|
|
switch (proto) {
|
|
case IPPROTO_IPV4:
|
|
case IPPROTO_IPV6:
|
|
case IPPROTO_GRE:
|
|
case IPPROTO_ICMPV6:
|
|
case IPPROTO_ETHERIP:
|
|
case IPPROTO_PIM:
|
|
case IPPROTO_SCTP:
|
|
return (true);
|
|
default:
|
|
return (false);
|
|
};
|
|
}
|
|
|
|
/*
|
|
* IPSEC_INPUT() method implementation for IPv6.
|
|
* 0 - Permitted by inbound security policy for further processing.
|
|
* EACCES - Forbidden by inbound security policy.
|
|
* EINPROGRESS - consumed by IPsec.
|
|
*/
|
|
int
|
|
ipsec6_input(struct mbuf *m, int offset, int proto)
|
|
{
|
|
|
|
switch (proto) {
|
|
case IPPROTO_AH:
|
|
case IPPROTO_ESP:
|
|
case IPPROTO_IPCOMP:
|
|
/* Do inbound IPsec processing for AH/ESP/IPCOMP */
|
|
ipsec_common_input(m, offset,
|
|
offsetof(struct ip6_hdr, ip6_nxt), AF_INET6, proto);
|
|
return (EINPROGRESS); /* mbuf consumed by IPsec */
|
|
default:
|
|
/*
|
|
* Protocols with further headers get their IPsec treatment
|
|
* within the protocol specific processing.
|
|
*/
|
|
if (!ipsec6_lasthdr(proto))
|
|
return (0);
|
|
/* FALLTHROUGH */
|
|
};
|
|
/*
|
|
* Enforce IPsec policy checking if we are seeing last header.
|
|
*/
|
|
if (ipsec6_in_reject(m, NULL) != 0) {
|
|
/* Forbidden by inbound security policy */
|
|
m_freem(m);
|
|
return (EACCES);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
ipsec6_ctlinput(ipsec_ctlinput_param_t param)
|
|
{
|
|
return (0);
|
|
}
|
|
|
|
extern ipproto_input_t *ip6_protox[];
|
|
|
|
/*
|
|
* IPsec input callback, called by the transform callback. Takes care of
|
|
* filtering and other sanity checks on the processed packet.
|
|
*/
|
|
int
|
|
ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip,
|
|
int protoff)
|
|
{
|
|
IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
|
|
struct epoch_tracker et;
|
|
struct ipsec_ctx_data ctx;
|
|
struct xform_history *xh;
|
|
struct secasindex *saidx;
|
|
struct ip6_hdr *ip6;
|
|
struct m_tag *mtag;
|
|
int prot, af, sproto;
|
|
int nxt, isr_prot;
|
|
int error, nest;
|
|
uint8_t nxt8;
|
|
|
|
IPSEC_ASSERT(sav != NULL, ("null SA"));
|
|
IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
|
|
saidx = &sav->sah->saidx;
|
|
af = saidx->dst.sa.sa_family;
|
|
IPSEC_ASSERT(af == AF_INET6, ("unexpected af %u", af));
|
|
sproto = saidx->proto;
|
|
IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
|
|
sproto == IPPROTO_IPCOMP,
|
|
("unexpected security protocol %u", sproto));
|
|
|
|
NET_EPOCH_ENTER(et);
|
|
|
|
/* Fix IPv6 header */
|
|
if (m->m_len < sizeof(struct ip6_hdr) &&
|
|
(m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
|
|
DPRINTF(("%s: processing failed for SA %s/%08lx\n",
|
|
__func__, ipsec_address(&sav->sah->saidx.dst, buf,
|
|
sizeof(buf)), (u_long) ntohl(sav->spi)));
|
|
|
|
IPSEC_ISTAT(sproto, hdrops);
|
|
error = EACCES;
|
|
goto bad;
|
|
}
|
|
|
|
IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_BEFORE);
|
|
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0)
|
|
goto bad;
|
|
|
|
ip6 = mtod(m, struct ip6_hdr *);
|
|
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
|
|
|
|
/* Save protocol */
|
|
m_copydata(m, protoff, 1, &nxt8);
|
|
prot = nxt8;
|
|
|
|
/* IPv6-in-IP encapsulation */
|
|
if (prot == IPPROTO_IPV6 &&
|
|
saidx->mode != IPSEC_MODE_TRANSPORT) {
|
|
if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) {
|
|
IPSEC_ISTAT(sproto, hdrops);
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
/* ip6n will now contain the inner IPv6 header. */
|
|
m_striphdr(m, 0, skip);
|
|
skip = 0;
|
|
}
|
|
#ifdef INET
|
|
/* IP-in-IP encapsulation */
|
|
else if (prot == IPPROTO_IPIP &&
|
|
saidx->mode != IPSEC_MODE_TRANSPORT) {
|
|
if (m->m_pkthdr.len - skip < sizeof(struct ip)) {
|
|
IPSEC_ISTAT(sproto, hdrops);
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
/* ipn will now contain the inner IPv4 header */
|
|
m_striphdr(m, 0, skip);
|
|
skip = 0;
|
|
}
|
|
#endif /* INET */
|
|
else {
|
|
prot = IPPROTO_IPV6; /* for correct BPF processing */
|
|
}
|
|
|
|
/*
|
|
* Record what we've done to the packet (under what SA it was
|
|
* processed).
|
|
*/
|
|
if (sproto != IPPROTO_IPCOMP) {
|
|
mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE,
|
|
sizeof(struct xform_history), M_NOWAIT);
|
|
if (mtag == NULL) {
|
|
DPRINTF(("%s: failed to get tag\n", __func__));
|
|
IPSEC_ISTAT(sproto, hdrops);
|
|
error = ENOMEM;
|
|
goto bad;
|
|
}
|
|
|
|
xh = (struct xform_history *)(mtag + 1);
|
|
bcopy(&saidx->dst, &xh->dst, saidx->dst.sa.sa_len);
|
|
xh->spi = sav->spi;
|
|
xh->proto = sproto;
|
|
xh->mode = saidx->mode;
|
|
m_tag_prepend(m, mtag);
|
|
}
|
|
|
|
key_sa_recordxfer(sav, m);
|
|
|
|
#ifdef INET
|
|
if (prot == IPPROTO_IPIP)
|
|
af = AF_INET;
|
|
else
|
|
#endif
|
|
af = AF_INET6;
|
|
IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_AFTER);
|
|
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0)
|
|
goto bad;
|
|
if (skip == 0) {
|
|
/*
|
|
* We stripped outer IPv6 header.
|
|
* Now we should requeue decrypted packet via netisr.
|
|
*/
|
|
switch (prot) {
|
|
#ifdef INET
|
|
case IPPROTO_IPIP:
|
|
isr_prot = NETISR_IP;
|
|
break;
|
|
#endif
|
|
case IPPROTO_IPV6:
|
|
isr_prot = NETISR_IPV6;
|
|
break;
|
|
default:
|
|
DPRINTF(("%s: cannot handle inner ip proto %d\n",
|
|
__func__, prot));
|
|
IPSEC_ISTAT(sproto, nopf);
|
|
error = EPFNOSUPPORT;
|
|
goto bad;
|
|
}
|
|
/* Handle virtual tunneling interfaces */
|
|
if (saidx->mode == IPSEC_MODE_TUNNEL)
|
|
error = ipsec_if_input(m, sav, af);
|
|
if (error == 0) {
|
|
error = netisr_queue_src(isr_prot,
|
|
(uintptr_t)sav->spi, m);
|
|
if (error) {
|
|
IPSEC_ISTAT(sproto, qfull);
|
|
DPRINTF(("%s: queue full; proto %u packet"
|
|
" dropped\n", __func__, sproto));
|
|
}
|
|
}
|
|
NET_EPOCH_EXIT(et);
|
|
key_freesav(&sav);
|
|
return (error);
|
|
}
|
|
/*
|
|
* See the end of ip6_input for this logic.
|
|
* IPPROTO_IPV[46] case will be processed just like other ones
|
|
*/
|
|
nest = 0;
|
|
nxt = nxt8;
|
|
while (nxt != IPPROTO_DONE) {
|
|
if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
|
|
IP6STAT_INC(ip6s_toomanyhdr);
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* Protection against faulty packet - there should be
|
|
* more sanity checks in header chain processing.
|
|
*/
|
|
if (m->m_pkthdr.len < skip) {
|
|
IP6STAT_INC(ip6s_tooshort);
|
|
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
/*
|
|
* Enforce IPsec policy checking if we are seeing last header.
|
|
* note that we do not visit this with protocols with pcb layer
|
|
* code - like udp/tcp/raw ip.
|
|
*/
|
|
if (ipsec6_lasthdr(nxt) && ipsec6_in_reject(m, NULL)) {
|
|
error = EINVAL;
|
|
goto bad;
|
|
}
|
|
nxt = ip6_protox[nxt](&m, &skip, nxt);
|
|
}
|
|
NET_EPOCH_EXIT(et);
|
|
key_freesav(&sav);
|
|
return (0);
|
|
bad:
|
|
NET_EPOCH_EXIT(et);
|
|
key_freesav(&sav);
|
|
if (m)
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
#endif /* INET6 */
|