Current Path : /sys/netinet/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/netinet/in_gif.c |
/* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */ /*- * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD: release/9.1.0/sys/netinet/in_gif.c 223637 2011-06-28 11:57:25Z bz $"); #include "opt_mrouting.h" #include "opt_inet.h" #include "opt_inet6.h" #include <sys/param.h> #include <sys/systm.h> #include <sys/socket.h> #include <sys/sockio.h> #include <sys/mbuf.h> #include <sys/errno.h> #include <sys/kernel.h> #include <sys/sysctl.h> #include <sys/protosw.h> #include <sys/malloc.h> #include <net/if.h> #include <net/route.h> #include <net/vnet.h> #include <netinet/in.h> #include <netinet/in_systm.h> #include <netinet/ip.h> #include <netinet/ip_var.h> #include <netinet/in_gif.h> #include <netinet/in_var.h> #include <netinet/ip_encap.h> #include <netinet/ip_ecn.h> #ifdef INET6 #include <netinet/ip6.h> #endif #ifdef MROUTING #include <netinet/ip_mroute.h> #endif /* MROUTING */ #include <net/if_gif.h> static int gif_validate4(const struct ip *, struct gif_softc *, struct ifnet *); extern struct domain inetdomain; struct protosw in_gif_protosw = { .pr_type = SOCK_RAW, .pr_domain = &inetdomain, .pr_protocol = 0/* IPPROTO_IPV[46] */, .pr_flags = PR_ATOMIC|PR_ADDR, .pr_input = in_gif_input, .pr_output = (pr_output_t*)rip_output, .pr_ctloutput = rip_ctloutput, .pr_usrreqs = &rip_usrreqs }; VNET_DEFINE(int, ip_gif_ttl) = GIF_TTL; #define V_ip_gif_ttl VNET(ip_gif_ttl) SYSCTL_VNET_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW, &VNET_NAME(ip_gif_ttl), 0, ""); int in_gif_output(struct ifnet *ifp, int family, struct mbuf *m) { struct gif_softc *sc = ifp->if_softc; struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst; struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc; struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst; struct ip iphdr; /* capsule IP header, host byte ordered */ struct etherip_header eiphdr; int error, len, proto; u_int8_t tos; GIF_LOCK_ASSERT(sc); if (sin_src == NULL || sin_dst == NULL || sin_src->sin_family != AF_INET || sin_dst->sin_family != AF_INET) { m_freem(m); return EAFNOSUPPORT; } switch (family) { #ifdef INET case AF_INET: { struct ip *ip; proto = IPPROTO_IPV4; if (m->m_len < sizeof(*ip)) { m = m_pullup(m, sizeof(*ip)); if (!m) return ENOBUFS; } ip = mtod(m, struct ip *); tos = ip->ip_tos; break; } #endif /* INET */ #ifdef INET6 case AF_INET6: { struct ip6_hdr *ip6; proto = IPPROTO_IPV6; if (m->m_len < sizeof(*ip6)) { m = m_pullup(m, sizeof(*ip6)); if (!m) return ENOBUFS; } ip6 = mtod(m, struct ip6_hdr *); tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; break; } #endif /* INET6 */ case AF_LINK: proto = IPPROTO_ETHERIP; /* * GIF_SEND_REVETHIP (disabled by default) intentionally * sends an EtherIP packet with revered version field in * the header. This is a knob for backward compatibility * with FreeBSD 7.2R or prior. */ if ((sc->gif_options & GIF_SEND_REVETHIP)) { eiphdr.eip_ver = 0; eiphdr.eip_resvl = ETHERIP_VERSION; eiphdr.eip_resvh = 0; } else { eiphdr.eip_ver = ETHERIP_VERSION; eiphdr.eip_resvl = 0; eiphdr.eip_resvh = 0; } /* prepend Ethernet-in-IP header */ M_PREPEND(m, sizeof(struct etherip_header), M_DONTWAIT); if (m && m->m_len < sizeof(struct etherip_header)) m = m_pullup(m, sizeof(struct etherip_header)); if (m == NULL) return ENOBUFS; bcopy(&eiphdr, mtod(m, struct etherip_header *), sizeof(struct etherip_header)); break; default: #ifdef DEBUG printf("in_gif_output: warning: unknown family %d passed\n", family); #endif m_freem(m); return EAFNOSUPPORT; } bzero(&iphdr, sizeof(iphdr)); iphdr.ip_src = sin_src->sin_addr; /* bidirectional configured tunnel mode */ if (sin_dst->sin_addr.s_addr != INADDR_ANY) iphdr.ip_dst = sin_dst->sin_addr; else { m_freem(m); return ENETUNREACH; } iphdr.ip_p = proto; /* version will be set in ip_output() */ iphdr.ip_ttl = V_ip_gif_ttl; iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip); ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, &iphdr.ip_tos, &tos); /* prepend new IP header */ len = sizeof(struct ip); #ifndef __NO_STRICT_ALIGNMENT if (family == AF_LINK) len += ETHERIP_ALIGN; #endif M_PREPEND(m, len, M_DONTWAIT); if (m != NULL && m->m_len < len) m = m_pullup(m, len); if (m == NULL) { printf("ENOBUFS in in_gif_output %d\n", __LINE__); return ENOBUFS; } #ifndef __NO_STRICT_ALIGNMENT if (family == AF_LINK) { len = mtod(m, vm_offset_t) & 3; KASSERT(len == 0 || len == ETHERIP_ALIGN, ("in_gif_output: unexpected misalignment")); m->m_data += len; m->m_len -= ETHERIP_ALIGN; } #endif bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip)); M_SETFIB(m, sc->gif_fibnum); if (dst->sin_family != sin_dst->sin_family || dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) { /* cache route doesn't match */ bzero(dst, sizeof(*dst)); dst->sin_family = sin_dst->sin_family; dst->sin_len = sizeof(struct sockaddr_in); dst->sin_addr = sin_dst->sin_addr; if (sc->gif_ro.ro_rt) { RTFREE(sc->gif_ro.ro_rt); sc->gif_ro.ro_rt = NULL; } #if 0 GIF2IFP(sc)->if_mtu = GIF_MTU; #endif } if (sc->gif_ro.ro_rt == NULL) { in_rtalloc_ign(&sc->gif_ro, 0, sc->gif_fibnum); if (sc->gif_ro.ro_rt == NULL) { m_freem(m); return ENETUNREACH; } /* if it constitutes infinite encapsulation, punt. */ if (sc->gif_ro.ro_rt->rt_ifp == ifp) { m_freem(m); return ENETUNREACH; /* XXX */ } #if 0 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu - sizeof(struct ip); #endif } m_addr_changed(m); error = ip_output(m, NULL, &sc->gif_ro, 0, NULL, NULL); if (!(GIF2IFP(sc)->if_flags & IFF_LINK0) && sc->gif_ro.ro_rt != NULL) { RTFREE(sc->gif_ro.ro_rt); sc->gif_ro.ro_rt = NULL; } return (error); } void in_gif_input(struct mbuf *m, int off) { struct ifnet *gifp = NULL; struct gif_softc *sc; struct ip *ip; int af; u_int8_t otos; int proto; ip = mtod(m, struct ip *); proto = ip->ip_p; sc = (struct gif_softc *)encap_getarg(m); if (sc == NULL) { m_freem(m); KMOD_IPSTAT_INC(ips_nogif); return; } gifp = GIF2IFP(sc); if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) { m_freem(m); KMOD_IPSTAT_INC(ips_nogif); return; } otos = ip->ip_tos; m_adj(m, off); switch (proto) { #ifdef INET case IPPROTO_IPV4: { struct ip *ip; af = AF_INET; if (m->m_len < sizeof(*ip)) { m = m_pullup(m, sizeof(*ip)); if (!m) return; } ip = mtod(m, struct ip *); if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, &otos, &ip->ip_tos) == 0) { m_freem(m); return; } break; } #endif #ifdef INET6 case IPPROTO_IPV6: { struct ip6_hdr *ip6; u_int8_t itos, oitos; af = AF_INET6; if (m->m_len < sizeof(*ip6)) { m = m_pullup(m, sizeof(*ip6)); if (!m) return; } ip6 = mtod(m, struct ip6_hdr *); itos = oitos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; if (ip_ecn_egress((gifp->if_flags & IFF_LINK1) ? ECN_ALLOWED : ECN_NOCARE, &otos, &itos) == 0) { m_freem(m); return; } if (itos != oitos) { ip6->ip6_flow &= ~htonl(0xff << 20); ip6->ip6_flow |= htonl((u_int32_t)itos << 20); } break; } #endif /* INET6 */ case IPPROTO_ETHERIP: af = AF_LINK; break; default: KMOD_IPSTAT_INC(ips_nogif); m_freem(m); return; } gif_input(m, af, gifp); return; } /* * validate outer address. */ static int gif_validate4(const struct ip *ip, struct gif_softc *sc, struct ifnet *ifp) { struct sockaddr_in *src, *dst; struct in_ifaddr *ia4; src = (struct sockaddr_in *)sc->gif_psrc; dst = (struct sockaddr_in *)sc->gif_pdst; /* check for address match */ if (src->sin_addr.s_addr != ip->ip_dst.s_addr || dst->sin_addr.s_addr != ip->ip_src.s_addr) return 0; /* martian filters on outer source - NOT done in ip_input! */ if (IN_MULTICAST(ntohl(ip->ip_src.s_addr))) return 0; switch ((ntohl(ip->ip_src.s_addr) & 0xff000000) >> 24) { case 0: case 127: case 255: return 0; } /* reject packets with broadcast on source */ /* XXXRW: should use hash lists? */ IN_IFADDR_RLOCK(); TAILQ_FOREACH(ia4, &V_in_ifaddrhead, ia_link) { if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0) continue; if (ip->ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr) { IN_IFADDR_RUNLOCK(); return 0; } } IN_IFADDR_RUNLOCK(); /* ingress filters on outer source */ if ((GIF2IFP(sc)->if_flags & IFF_LINK2) == 0 && ifp) { struct sockaddr_in sin; struct rtentry *rt; bzero(&sin, sizeof(sin)); sin.sin_family = AF_INET; sin.sin_len = sizeof(struct sockaddr_in); sin.sin_addr = ip->ip_src; /* XXX MRT check for the interface we would use on output */ rt = in_rtalloc1((struct sockaddr *)&sin, 0, 0UL, sc->gif_fibnum); if (!rt || rt->rt_ifp != ifp) { #if 0 log(LOG_WARNING, "%s: packet from 0x%x dropped " "due to ingress filter\n", if_name(GIF2IFP(sc)), (u_int32_t)ntohl(sin.sin_addr.s_addr)); #endif if (rt) RTFREE_LOCKED(rt); return 0; } RTFREE_LOCKED(rt); } return 32 * 2; } /* * we know that we are in IFF_UP, outer address available, and outer family * matched the physical addr family. see gif_encapcheck(). */ int gif_encapcheck4(const struct mbuf *m, int off, int proto, void *arg) { struct ip ip; struct gif_softc *sc; struct ifnet *ifp; /* sanity check done in caller */ sc = (struct gif_softc *)arg; /* LINTED const cast */ m_copydata(m, 0, sizeof(ip), (caddr_t)&ip); ifp = ((m->m_flags & M_PKTHDR) != 0) ? m->m_pkthdr.rcvif : NULL; return gif_validate4(&ip, sc, ifp); } int in_gif_attach(struct gif_softc *sc) { sc->encap_cookie4 = encap_attach_func(AF_INET, -1, gif_encapcheck, &in_gif_protosw, sc); if (sc->encap_cookie4 == NULL) return EEXIST; return 0; } int in_gif_detach(struct gif_softc *sc) { int error; error = encap_detach(sc->encap_cookie4); if (error == 0) sc->encap_cookie4 = NULL; return error; }