in_gif.c revision 54263
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 54263 1999-12-07 17:39:16Z 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> 5554263Sshin#include <netinet/ip_var.h> 5654263Sshin#include <netinet/in_gif.h> 5754263Sshin 5854263Sshin#ifdef INET6 5954263Sshin#include <netinet/ip6.h> 6054263Sshin#endif 6154263Sshin 6254263Sshin#ifdef MROUTING 6354263Sshin#include <netinet/ip_mroute.h> 6454263Sshin#endif /* MROUTING */ 6554263Sshin 6654263Sshin#include <net/if_gif.h> 6754263Sshin 6854263Sshin#include "gif.h" 6954263Sshin 7054263Sshin#include <machine/stdarg.h> 7154263Sshin 7254263Sshin#include <net/net_osdep.h> 7354263Sshin 7454263Sshin#if NGIF > 0 7554263Sshinint ip_gif_ttl = GIF_TTL; 7654263Sshin#else 7754263Sshinint ip_gif_ttl = 0; 7854263Sshin#endif 7954263Sshin 8054263SshinSYSCTL_DECL(_net_inet_ip); 8154263SshinSYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW, 8254263Sshin &ip_gif_ttl, 0, ""); 8354263Sshin 8454263Sshinint 8554263Sshinin_gif_output(ifp, family, m, rt) 8654263Sshin struct ifnet *ifp; 8754263Sshin int family; 8854263Sshin struct mbuf *m; 8954263Sshin struct rtentry *rt; 9054263Sshin{ 9154263Sshin register struct gif_softc *sc = (struct gif_softc*)ifp; 9254263Sshin struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst; 9354263Sshin struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc; 9454263Sshin struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst; 9554263Sshin struct ip iphdr; /* capsule IP header, host byte ordered */ 9654263Sshin int proto, error; 9754263Sshin u_int8_t tos; 9854263Sshin 9954263Sshin if (sin_src == NULL || sin_dst == NULL || 10054263Sshin sin_src->sin_family != AF_INET || 10154263Sshin sin_dst->sin_family != AF_INET) { 10254263Sshin m_freem(m); 10354263Sshin return EAFNOSUPPORT; 10454263Sshin } 10554263Sshin 10654263Sshin switch (family) { 10754263Sshin case AF_INET: 10854263Sshin { 10954263Sshin struct ip *ip; 11054263Sshin 11154263Sshin proto = IPPROTO_IPV4; 11254263Sshin if (m->m_len < sizeof(*ip)) { 11354263Sshin m = m_pullup(m, sizeof(*ip)); 11454263Sshin if (!m) 11554263Sshin return ENOBUFS; 11654263Sshin } 11754263Sshin ip = mtod(m, struct ip *); 11854263Sshin tos = ip->ip_tos; 11954263Sshin break; 12054263Sshin } 12154263Sshin#ifdef INET6 12254263Sshin case AF_INET6: 12354263Sshin { 12454263Sshin struct ip6_hdr *ip6; 12554263Sshin proto = IPPROTO_IPV6; 12654263Sshin if (m->m_len < sizeof(*ip6)) { 12754263Sshin m = m_pullup(m, sizeof(*ip6)); 12854263Sshin if (!m) 12954263Sshin return ENOBUFS; 13054263Sshin } 13154263Sshin ip6 = mtod(m, struct ip6_hdr *); 13254263Sshin tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 13354263Sshin break; 13454263Sshin } 13554263Sshin#endif /*INET6*/ 13654263Sshin default: 13754263Sshin#ifdef DIAGNOSTIC 13854263Sshin printf("in_gif_output: warning: unknown family %d passed\n", 13954263Sshin family); 14054263Sshin#endif 14154263Sshin m_freem(m); 14254263Sshin return EAFNOSUPPORT; 14354263Sshin } 14454263Sshin 14554263Sshin bzero(&iphdr, sizeof(iphdr)); 14654263Sshin iphdr.ip_src = sin_src->sin_addr; 14754263Sshin if (ifp->if_flags & IFF_LINK0) { 14854263Sshin /* multi-destination mode */ 14954263Sshin if (sin_dst->sin_addr.s_addr != INADDR_ANY) 15054263Sshin iphdr.ip_dst = sin_dst->sin_addr; 15154263Sshin else if (rt) { 15254263Sshin iphdr.ip_dst = ((struct sockaddr_in *) 15354263Sshin (rt->rt_gateway))->sin_addr; 15454263Sshin } else { 15554263Sshin m_freem(m); 15654263Sshin return ENETUNREACH; 15754263Sshin } 15854263Sshin } else { 15954263Sshin /* bidirectional configured tunnel mode */ 16054263Sshin if (sin_dst->sin_addr.s_addr != INADDR_ANY) 16154263Sshin iphdr.ip_dst = sin_dst->sin_addr; 16254263Sshin else { 16354263Sshin m_freem(m); 16454263Sshin return ENETUNREACH; 16554263Sshin } 16654263Sshin } 16754263Sshin iphdr.ip_p = proto; 16854263Sshin /* version will be set in ip_output() */ 16954263Sshin iphdr.ip_ttl = ip_gif_ttl; 17054263Sshin iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip); 17154263Sshin 17254263Sshin /* prepend new IP header */ 17354263Sshin M_PREPEND(m, sizeof(struct ip), M_DONTWAIT); 17454263Sshin if (m && m->m_len < sizeof(struct ip)) 17554263Sshin m = m_pullup(m, sizeof(struct ip)); 17654263Sshin if (m == NULL) { 17754263Sshin printf("ENOBUFS in in_gif_output %d\n", __LINE__); 17854263Sshin return ENOBUFS; 17954263Sshin } 18054263Sshin 18154263Sshin *(mtod(m, struct ip *)) = iphdr; 18254263Sshin 18354263Sshin if (dst->sin_family != sin_dst->sin_family || 18454263Sshin dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) { 18554263Sshin /* cache route doesn't match */ 18654263Sshin dst->sin_family = sin_dst->sin_family; 18754263Sshin dst->sin_len = sizeof(struct sockaddr_in); 18854263Sshin dst->sin_addr = sin_dst->sin_addr; 18954263Sshin if (sc->gif_ro.ro_rt) { 19054263Sshin RTFREE(sc->gif_ro.ro_rt); 19154263Sshin sc->gif_ro.ro_rt = NULL; 19254263Sshin } 19354263Sshin } 19454263Sshin 19554263Sshin if (sc->gif_ro.ro_rt == NULL) { 19654263Sshin rtalloc(&sc->gif_ro); 19754263Sshin if (sc->gif_ro.ro_rt == NULL) { 19854263Sshin m_freem(m); 19954263Sshin return ENETUNREACH; 20054263Sshin } 20154263Sshin } 20254263Sshin 20354263Sshin#ifdef IPSEC 20454263Sshin m->m_pkthdr.rcvif = NULL; 20554263Sshin#endif /*IPSEC*/ 20654263Sshin error = ip_output(m, 0, &sc->gif_ro, 0, 0); 20754263Sshin return(error); 20854263Sshin} 20954263Sshin 21054263Sshinvoid 21154263Sshin#if __STDC__ 21254263Sshinin_gif_input(struct mbuf *m, ...) 21354263Sshin#else 21454263Sshinin_gif_input(m, va_alist) 21554263Sshin struct mbuf *m; 21654263Sshin va_dcl 21754263Sshin#endif 21854263Sshin{ 21954263Sshin int off, proto; 22054263Sshin struct gif_softc *sc; 22154263Sshin struct ifnet *gifp = NULL; 22254263Sshin struct ip *ip; 22354263Sshin int i, af; 22454263Sshin va_list ap; 22554263Sshin 22654263Sshin va_start(ap, m); 22754263Sshin off = va_arg(ap, int); 22854263Sshin proto = va_arg(ap, int); 22954263Sshin va_end(ap); 23054263Sshin 23154263Sshin ip = mtod(m, struct ip *); 23254263Sshin 23354263Sshin /* this code will be soon improved. */ 23454263Sshin#define satosin(sa) ((struct sockaddr_in *)(sa)) 23554263Sshin for (i = 0, sc = gif; i < ngif; i++, sc++) { 23654263Sshin if (sc->gif_psrc == NULL 23754263Sshin || sc->gif_pdst == NULL 23854263Sshin || sc->gif_psrc->sa_family != AF_INET 23954263Sshin || sc->gif_pdst->sa_family != AF_INET) { 24054263Sshin continue; 24154263Sshin } 24254263Sshin 24354263Sshin if ((sc->gif_if.if_flags & IFF_UP) == 0) 24454263Sshin continue; 24554263Sshin 24654263Sshin if ((sc->gif_if.if_flags & IFF_LINK0) 24754263Sshin && satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 24854263Sshin && satosin(sc->gif_pdst)->sin_addr.s_addr == INADDR_ANY) { 24954263Sshin gifp = &sc->gif_if; 25054263Sshin continue; 25154263Sshin } 25254263Sshin 25354263Sshin if (satosin(sc->gif_psrc)->sin_addr.s_addr == ip->ip_dst.s_addr 25454263Sshin && satosin(sc->gif_pdst)->sin_addr.s_addr == ip->ip_src.s_addr) 25554263Sshin { 25654263Sshin gifp = &sc->gif_if; 25754263Sshin break; 25854263Sshin } 25954263Sshin } 26054263Sshin 26154263Sshin if (gifp == NULL) { 26254263Sshin#ifdef MROUTING 26354263Sshin /* for backward compatibility */ 26454263Sshin if (proto == IPPROTO_IPV4) { 26554263Sshin ipip_input(m, off, proto); 26654263Sshin return; 26754263Sshin } 26854263Sshin#endif /*MROUTING*/ 26954263Sshin m_freem(m); 27054263Sshin ipstat.ips_nogif++; 27154263Sshin return; 27254263Sshin } 27354263Sshin 27454263Sshin m_adj(m, off); 27554263Sshin 27654263Sshin switch (proto) { 27754263Sshin case IPPROTO_IPV4: 27854263Sshin { 27954263Sshin struct ip *ip; 28054263Sshin af = AF_INET; 28154263Sshin if (m->m_len < sizeof(*ip)) { 28254263Sshin m = m_pullup(m, sizeof(*ip)); 28354263Sshin if (!m) 28454263Sshin return; 28554263Sshin } 28654263Sshin ip = mtod(m, struct ip *); 28754263Sshin break; 28854263Sshin } 28954263Sshin#ifdef INET6 29054263Sshin case IPPROTO_IPV6: 29154263Sshin { 29254263Sshin struct ip6_hdr *ip6; 29354263Sshin af = AF_INET6; 29454263Sshin if (m->m_len < sizeof(*ip6)) { 29554263Sshin m = m_pullup(m, sizeof(*ip6)); 29654263Sshin if (!m) 29754263Sshin return; 29854263Sshin } 29954263Sshin ip6 = mtod(m, struct ip6_hdr *); 30054263Sshin ip6->ip6_flow &= ~htonl(0xff << 20); 30154263Sshin break; 30254263Sshin } 30354263Sshin#endif /* INET6 */ 30454263Sshin default: 30554263Sshin ipstat.ips_nogif++; 30654263Sshin m_freem(m); 30754263Sshin return; 30854263Sshin } 30954263Sshin gif_input(m, af, gifp); 31054263Sshin return; 31154263Sshin} 312