in_gif.c revision 55009
154263Sshin/* 254263Sshin * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 354263Sshin * All rights reserved. 454263Sshin * 554263Sshin * Redistribution and use in source and binary forms, with or without 654263Sshin * modification, are permitted provided that the following conditions 754263Sshin * are met: 854263Sshin * 1. Redistributions of source code must retain the above copyright 954263Sshin * notice, this list of conditions and the following disclaimer. 1054263Sshin * 2. Redistributions in binary form must reproduce the above copyright 1154263Sshin * notice, this list of conditions and the following disclaimer in the 1254263Sshin * documentation and/or other materials provided with the distribution. 1354263Sshin * 3. Neither the name of the project nor the names of its contributors 1454263Sshin * may be used to endorse or promote products derived from this software 1554263Sshin * without specific prior written permission. 1654263Sshin * 1754263Sshin * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 1854263Sshin * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1954263Sshin * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2054263Sshin * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 2154263Sshin * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2254263Sshin * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2354263Sshin * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2454263Sshin * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2554263Sshin * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2654263Sshin * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2754263Sshin * SUCH DAMAGE. 2854263Sshin * 2954263Sshin * $FreeBSD: head/sys/netinet/in_gif.c 55009 1999-12-22 19:13:38Z shin $ 3054263Sshin */ 3154263Sshin 3254263Sshin/* 3354263Sshin * in_gif.c 3454263Sshin */ 3554263Sshin 3654263Sshin#include "opt_mrouting.h" 3754263Sshin#include "opt_inet6.h" 3854263Sshin 3954263Sshin#include <sys/param.h> 4054263Sshin#include <sys/systm.h> 4154263Sshin#include <sys/socket.h> 4254263Sshin#include <sys/sockio.h> 4354263Sshin#include <sys/mbuf.h> 4454263Sshin#include <sys/errno.h> 4554263Sshin#include <sys/kernel.h> 4654263Sshin#include <sys/sysctl.h> 4754263Sshin#include <sys/protosw.h> 4854263Sshin 4954263Sshin#include <net/if.h> 5054263Sshin#include <net/route.h> 5154263Sshin 5254263Sshin#include <netinet/in.h> 5354263Sshin#include <netinet/in_systm.h> 5454263Sshin#include <netinet/ip.h> 5555009Sshin#ifdef INET6 5655009Sshin#include <netinet/ip6.h> 5755009Sshin#endif 5854263Sshin#include <netinet/ip_var.h> 5954263Sshin#include <netinet/in_gif.h> 6055009Sshin#include <netinet/ip_ecn.h> 6154263Sshin#ifdef INET6 6255009Sshin#include <netinet6/ip6_ecn.h> 6354263Sshin#endif 6454263Sshin 6554263Sshin#ifdef MROUTING 6654263Sshin#include <netinet/ip_mroute.h> 6754263Sshin#endif /* MROUTING */ 6854263Sshin 6954263Sshin#include <net/if_gif.h> 7054263Sshin 7154263Sshin#include "gif.h" 7254263Sshin 7354263Sshin#include <machine/stdarg.h> 7454263Sshin 7554263Sshin#include <net/net_osdep.h> 7654263Sshin 7754263Sshin#if NGIF > 0 7854263Sshinint ip_gif_ttl = GIF_TTL; 7954263Sshin#else 8054263Sshinint ip_gif_ttl = 0; 8154263Sshin#endif 8254263Sshin 8354263SshinSYSCTL_DECL(_net_inet_ip); 8454263SshinSYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW, 8554263Sshin &ip_gif_ttl, 0, ""); 8654263Sshin 8754263Sshinint 8854263Sshinin_gif_output(ifp, family, m, rt) 8954263Sshin struct ifnet *ifp; 9054263Sshin int family; 9154263Sshin struct mbuf *m; 9254263Sshin struct rtentry *rt; 9354263Sshin{ 9454263Sshin register struct gif_softc *sc = (struct gif_softc*)ifp; 9554263Sshin struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst; 9654263Sshin struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc; 9754263Sshin struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst; 9854263Sshin struct ip iphdr; /* capsule IP header, host byte ordered */ 9954263Sshin int proto, error; 10054263Sshin u_int8_t tos; 10154263Sshin 10254263Sshin if (sin_src == NULL || sin_dst == NULL || 10354263Sshin sin_src->sin_family != AF_INET || 10454263Sshin sin_dst->sin_family != AF_INET) { 10554263Sshin m_freem(m); 10654263Sshin return EAFNOSUPPORT; 10754263Sshin } 10854263Sshin 10954263Sshin switch (family) { 11054263Sshin case AF_INET: 11154263Sshin { 11254263Sshin struct ip *ip; 11354263Sshin 11454263Sshin proto = IPPROTO_IPV4; 11554263Sshin if (m->m_len < sizeof(*ip)) { 11654263Sshin m = m_pullup(m, sizeof(*ip)); 11754263Sshin if (!m) 11854263Sshin return ENOBUFS; 11954263Sshin } 12054263Sshin ip = mtod(m, struct ip *); 12154263Sshin tos = ip->ip_tos; 12254263Sshin break; 12354263Sshin } 12454263Sshin#ifdef INET6 12554263Sshin case AF_INET6: 12654263Sshin { 12754263Sshin struct ip6_hdr *ip6; 12854263Sshin proto = IPPROTO_IPV6; 12954263Sshin if (m->m_len < sizeof(*ip6)) { 13054263Sshin m = m_pullup(m, sizeof(*ip6)); 13154263Sshin if (!m) 13254263Sshin return ENOBUFS; 13354263Sshin } 13454263Sshin ip6 = mtod(m, struct ip6_hdr *); 13554263Sshin tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 13654263Sshin break; 13754263Sshin } 13854263Sshin#endif /*INET6*/ 13954263Sshin default: 14054263Sshin#ifdef DIAGNOSTIC 14154263Sshin printf("in_gif_output: warning: unknown family %d passed\n", 14254263Sshin family); 14354263Sshin#endif 14454263Sshin m_freem(m); 14554263Sshin return EAFNOSUPPORT; 14654263Sshin } 14754263Sshin 14854263Sshin bzero(&iphdr, sizeof(iphdr)); 14954263Sshin iphdr.ip_src = sin_src->sin_addr; 15054263Sshin if (ifp->if_flags & IFF_LINK0) { 15154263Sshin /* multi-destination mode */ 15254263Sshin if (sin_dst->sin_addr.s_addr != INADDR_ANY) 15354263Sshin iphdr.ip_dst = sin_dst->sin_addr; 15454263Sshin else if (rt) { 15554263Sshin iphdr.ip_dst = ((struct sockaddr_in *) 15654263Sshin (rt->rt_gateway))->sin_addr; 15754263Sshin } else { 15854263Sshin m_freem(m); 15954263Sshin return ENETUNREACH; 16054263Sshin } 16154263Sshin } else { 16254263Sshin /* bidirectional configured tunnel mode */ 16354263Sshin if (sin_dst->sin_addr.s_addr != INADDR_ANY) 16454263Sshin iphdr.ip_dst = sin_dst->sin_addr; 16554263Sshin else { 16654263Sshin m_freem(m); 16754263Sshin return ENETUNREACH; 16854263Sshin } 16954263Sshin } 17054263Sshin iphdr.ip_p = proto; 17154263Sshin /* version will be set in ip_output() */ 17254263Sshin iphdr.ip_ttl = ip_gif_ttl; 17354263Sshin iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip); 17455009Sshin if (ifp->if_flags & IFF_LINK1) 17555009Sshin ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos); 17654263Sshin 17754263Sshin /* prepend new IP header */ 17854263Sshin M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 17954263Sshin if (m && m->m_len < sizeof(struct ip)) 18054263Sshin m = m_pullup(m, sizeof(struct ip)); 18154263Sshin if (m == NULL) { 18254263Sshin printf("ENOBUFS in in_gif_output %d\n", __LINE__); 18354263Sshin return ENOBUFS; 18454263Sshin } 18554263Sshin 18654263Sshin *(mtod(m, struct ip *)) = iphdr; 18754263Sshin 18854263Sshin if (dst->sin_family != sin_dst->sin_family || 18954263Sshin dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) { 19054263Sshin /* cache route doesn't match */ 19154263Sshin dst->sin_family = sin_dst->sin_family; 19254263Sshin dst->sin_len = sizeof(struct sockaddr_in); 19354263Sshin dst->sin_addr = sin_dst->sin_addr; 19454263Sshin if (sc->gif_ro.ro_rt) { 19554263Sshin RTFREE(sc->gif_ro.ro_rt); 19654263Sshin sc->gif_ro.ro_rt = NULL; 19754263Sshin } 19854263Sshin } 19954263Sshin 20054263Sshin if (sc->gif_ro.ro_rt == NULL) { 20154263Sshin rtalloc(&sc->gif_ro); 20254263Sshin if (sc->gif_ro.ro_rt == NULL) { 20354263Sshin m_freem(m); 20454263Sshin return ENETUNREACH; 20554263Sshin } 20654263Sshin } 20754263Sshin 20854263Sshin error = ip_output(m, 0, &sc->gif_ro, 0, 0); 20954263Sshin return(error); 21054263Sshin} 21154263Sshin 21254263Sshinvoid 21355009Sshinin_gif_input(struct mbuf *m, int off, int proto) 21454263Sshin{ 21554263Sshin struct gif_softc *sc; 21654263Sshin struct ifnet *gifp = NULL; 21754263Sshin struct ip *ip; 21854263Sshin int i, af; 21955009Sshin u_int8_t otos; 22054263Sshin 22154263Sshin ip = mtod(m, struct ip *); 22254263Sshin 22354263Sshin /* this code will be soon improved. */ 22454263Sshin#define satosin(sa) ((struct sockaddr_in *)(sa)) 22554263Sshin for (i = 0, sc = gif; i < ngif; i++, sc++) { 22654263Sshin if (sc->gif_psrc == NULL 22754263Sshin || sc->gif_pdst == NULL 22854263Sshin || sc->gif_psrc->sa_family != AF_INET 22954263Sshin || sc->gif_pdst->sa_family != AF_INET) { 23054263Sshin continue; 23154263Sshin } 23254263Sshin 23354263Sshin if ((sc->gif_if.if_flags & IFF_UP) == 0) 23454263Sshin continue; 23554263Sshin 23654263Sshin if ((sc->gif_if.if_flags & IFF_LINK0) 23754263Sshin && satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 23854263Sshin && satosin(sc->gif_pdst)->sin_addr.s_addr == INADDR_ANY) { 23954263Sshin gifp = &sc->gif_if; 24054263Sshin continue; 24154263Sshin } 24254263Sshin 24354263Sshin if (satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 24454263Sshin && satosin(sc->gif_pdst)->sin_addr.s_addr == ip->ip_src.s_addr) 24554263Sshin { 24654263Sshin gifp = &sc->gif_if; 24754263Sshin break; 24854263Sshin } 24954263Sshin } 25054263Sshin 25154263Sshin if (gifp == NULL) { 25254263Sshin#ifdef MROUTING 25354263Sshin /* for backward compatibility */ 25454263Sshin if (proto == IPPROTO_IPV4) { 25555009Sshin ipip_input(m, off, proto); 25654263Sshin return; 25754263Sshin } 25854263Sshin#endif /*MROUTING*/ 25954263Sshin m_freem(m); 26054263Sshin ipstat.ips_nogif++; 26154263Sshin return; 26254263Sshin } 26354263Sshin 26455009Sshin otos = ip->ip_tos; 26554263Sshin m_adj(m, off); 26654263Sshin 26754263Sshin switch (proto) { 26854263Sshin case IPPROTO_IPV4: 26954263Sshin { 27054263Sshin struct ip *ip; 27154263Sshin af = AF_INET; 27254263Sshin if (m->m_len < sizeof(*ip)) { 27354263Sshin m = m_pullup(m, sizeof(*ip)); 27454263Sshin if (!m) 27554263Sshin return; 27654263Sshin } 27754263Sshin ip = mtod(m, struct ip *); 27855009Sshin if (gifp->if_flags & IFF_LINK1) 27955009Sshin ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos); 28054263Sshin break; 28154263Sshin } 28254263Sshin#ifdef INET6 28354263Sshin case IPPROTO_IPV6: 28454263Sshin { 28554263Sshin struct ip6_hdr *ip6; 28655009Sshin u_int8_t itos; 28754263Sshin af = AF_INET6; 28854263Sshin if (m->m_len < sizeof(*ip6)) { 28954263Sshin m = m_pullup(m, sizeof(*ip6)); 29054263Sshin if (!m) 29154263Sshin return; 29254263Sshin } 29354263Sshin ip6 = mtod(m, struct ip6_hdr *); 29455009Sshin itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 29555009Sshin if (gifp->if_flags & IFF_LINK1) 29655009Sshin ip_ecn_egress(ECN_ALLOWED, &otos, &itos); 29754263Sshin ip6->ip6_flow &= ~htonl(0xff << 20); 29855009Sshin ip6->ip6_flow |= htonl((u_int32_t)itos << 20); 29954263Sshin break; 30054263Sshin } 30154263Sshin#endif /* INET6 */ 30254263Sshin default: 30354263Sshin ipstat.ips_nogif++; 30454263Sshin m_freem(m); 30554263Sshin return; 30654263Sshin } 30754263Sshin gif_input(m, af, gifp); 30854263Sshin return; 30954263Sshin} 310