250 lines
6.7 KiB
C
250 lines
6.7 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_gif.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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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 gif_validate6(const struct ip6_hdr *, struct gif_softc *,
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struct ifnet *);
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extern struct domain inet6domain;
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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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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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* validate outer address.
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*/
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static int
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gif_validate6(const struct ip6_hdr *ip6, struct gif_softc *sc,
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struct ifnet *ifp)
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{
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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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if (!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_src, &ip6->ip6_dst) ||
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!IN6_ARE_ADDR_EQUAL(&sc->gif_ip6hdr->ip6_dst, &ip6->ip6_src))
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return (0);
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/* martian filters on outer source - done in ip6_input */
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/* ingress filters on outer source */
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if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) {
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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 || rt->rt_ifp != ifp) {
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if (rt)
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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 (128 * 2);
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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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struct ip6_hdr ip6;
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struct gif_softc *sc;
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struct ifnet *ifp;
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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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m_copydata(m, 0, sizeof(ip6), (caddr_t)&ip6);
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ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL;
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return (gif_validate6(&ip6, sc, ifp));
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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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