10a0e0bf0a
ip_encap already has inspected mbuf's data, at least an IP header. And it is safe to use mtod() and do direct access to needed fields. Add M_ASSERTPKTHDR() to gif_encapcheck(), since the code expects that mbuf has a packet header. Move the code from gif_validate[46] into in[6]_gif_encapcheck(), also remove "martian filters" checks. According to RFC 4213 it is enough to verify that the source address is the address of the encapsulator, as configured on the decapsulator. Reviewed by: melifaro Obtained from: Yandex LLC Sponsored by: Yandex LLC
238 lines
6.5 KiB
C
238 lines
6.5 KiB
C
/*-
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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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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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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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* $KAME: in6_gif.c,v 1.49 2001/05/14 14:02:17 itojun Exp $
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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 <sys/param.h>
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#include <sys/lock.h>
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#include <sys/rmlock.h>
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#include <sys/systm.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/queue.h>
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#include <sys/syslog.h>
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#include <sys/sysctl.h>
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#include <sys/protosw.h>
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#include <sys/malloc.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/route.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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#ifdef INET
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#include <netinet/ip.h>
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#endif
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#include <netinet/ip_encap.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#include <netinet6/ip6_var.h>
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#include <netinet6/in6_var.h>
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#endif
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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 <net/if_gif.h>
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#define GIF_HLIM 30
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static VNET_DEFINE(int, ip6_gif_hlim) = GIF_HLIM;
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#define V_ip6_gif_hlim VNET(ip6_gif_hlim)
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SYSCTL_DECL(_net_inet6_ip6);
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SYSCTL_INT(_net_inet6_ip6, IPV6CTL_GIF_HLIM, gifhlim, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ip6_gif_hlim), 0, "");
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static int in6_gif_input(struct mbuf **, int *, int);
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extern struct domain inet6domain;
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static struct protosw in6_gif_protosw = {
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.pr_type = SOCK_RAW,
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.pr_domain = &inet6domain,
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.pr_protocol = 0, /* IPPROTO_IPV[46] */
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.pr_flags = PR_ATOMIC|PR_ADDR,
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.pr_input = in6_gif_input,
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.pr_output = rip6_output,
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.pr_ctloutput = rip6_ctloutput,
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.pr_usrreqs = &rip6_usrreqs
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};
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int
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in6_gif_output(struct ifnet *ifp, struct mbuf *m, int proto, uint8_t ecn)
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{
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GIF_RLOCK_TRACKER;
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struct gif_softc *sc = ifp->if_softc;
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struct ip6_hdr *ip6;
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int len;
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/* prepend new IP header */
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len = sizeof(struct ip6_hdr);
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#ifndef __NO_STRICT_ALIGNMENT
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if (proto == IPPROTO_ETHERIP)
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len += ETHERIP_ALIGN;
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#endif
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M_PREPEND(m, len, M_NOWAIT);
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if (m == NULL)
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return (ENOBUFS);
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#ifndef __NO_STRICT_ALIGNMENT
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if (proto == IPPROTO_ETHERIP) {
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len = mtod(m, vm_offset_t) & 3;
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KASSERT(len == 0 || len == ETHERIP_ALIGN,
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("in6_gif_output: unexpected misalignment"));
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m->m_data += len;
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m->m_len -= ETHERIP_ALIGN;
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}
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#endif
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ip6 = mtod(m, struct ip6_hdr *);
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GIF_RLOCK(sc);
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if (sc->gif_family != AF_INET6) {
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m_freem(m);
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GIF_RUNLOCK(sc);
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return (ENETDOWN);
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}
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bcopy(sc->gif_ip6hdr, ip6, sizeof(struct ip6_hdr));
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GIF_RUNLOCK(sc);
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ip6->ip6_flow |= htonl((uint32_t)ecn << 20);
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ip6->ip6_nxt = proto;
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ip6->ip6_hlim = V_ip6_gif_hlim;
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/*
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* force fragmentation to minimum MTU, to avoid path MTU discovery.
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* it is too painful to ask for resend of inner packet, to achieve
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* path MTU discovery for encapsulated packets.
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*/
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return (ip6_output(m, 0, NULL, IPV6_MINMTU, 0, NULL, NULL));
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}
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static int
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in6_gif_input(struct mbuf **mp, int *offp, int proto)
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{
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struct mbuf *m = *mp;
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struct ifnet *gifp;
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struct gif_softc *sc;
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struct ip6_hdr *ip6;
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uint8_t ecn;
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sc = encap_getarg(m);
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if (sc == NULL) {
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m_freem(m);
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IP6STAT_INC(ip6s_nogif);
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return (IPPROTO_DONE);
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}
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gifp = GIF2IFP(sc);
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if ((gifp->if_flags & IFF_UP) != 0) {
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ip6 = mtod(m, struct ip6_hdr *);
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ecn = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
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m_adj(m, *offp);
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gif_input(m, gifp, proto, ecn);
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} else {
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m_freem(m);
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IP6STAT_INC(ip6s_nogif);
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}
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return (IPPROTO_DONE);
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}
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/*
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* we know that we are in IFF_UP, outer address available, and outer family
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* matched the physical addr family. see gif_encapcheck().
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*/
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int
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in6_gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
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{
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const struct ip6_hdr *ip6;
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struct gif_softc *sc;
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int ret;
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/* sanity check done in caller */
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sc = (struct gif_softc *)arg;
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GIF_RLOCK_ASSERT(sc);
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/*
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* Check for address match. Note that the check is for an incoming
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* packet. We should compare the *source* address in our configuration
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* and the *destination* address of the packet, and vice versa.
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*/
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ip6 = mtod(m, const struct ip6_hdr *);
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if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_src, &ip6->ip6_dst))
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return (0);
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ret = 128;
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if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_dst, &ip6->ip6_src)) {
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if ((sc->gif_options & GIF_IGNORE_SOURCE) == 0)
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return (0);
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} else
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ret += 128;
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/* ingress filters on outer source */
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if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0) {
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struct sockaddr_in6 sin6;
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struct rtentry *rt;
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bzero(&sin6, sizeof(sin6));
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sin6.sin6_family = AF_INET6;
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sin6.sin6_len = sizeof(struct sockaddr_in6);
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sin6.sin6_addr = ip6->ip6_src;
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sin6.sin6_scope_id = 0; /* XXX */
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rt = in6_rtalloc1((struct sockaddr *)&sin6, 0, 0UL,
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sc->gif_fibnum);
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if (rt == NULL || rt->rt_ifp != m->m_pkthdr.rcvif) {
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if (rt != NULL)
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RTFREE_LOCKED(rt);
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return (0);
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}
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RTFREE_LOCKED(rt);
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}
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return (ret);
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}
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int
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in6_gif_attach(struct gif_softc *sc)
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{
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KASSERT(sc->gif_ecookie == NULL, ("gif_ecookie isn't NULL"));
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sc->gif_ecookie = encap_attach_func(AF_INET6, -1, gif_encapcheck,
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(void *)&in6_gif_protosw, sc);
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if (sc->gif_ecookie == NULL)
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return (EEXIST);
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return (0);
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}
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