| 1/* $FreeBSD: head/sys/netinet6/in6_gif.c 62587 2000-07-04 16:35:15Z itojun $ */ 2/* $KAME: in6_gif.c,v 1.37 2000/06/17 20:34:25 itojun Exp $ */ 3
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1/* 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE.
| 4/* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE.
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28 * 29 * $FreeBSD: head/sys/netinet6/in6_gif.c 55009 1999-12-22 19:13:38Z shin $
| |
30 */ 31 32/* 33 * in6_gif.c 34 */ 35 36#include "opt_inet.h"
| 31 */ 32 33/* 34 * in6_gif.c 35 */ 36 37#include "opt_inet.h"
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| 38#include "opt_inet6.h"
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37 38#include <sys/param.h> 39#include <sys/systm.h> 40#include <sys/socket.h> 41#include <sys/sockio.h> 42#include <sys/mbuf.h> 43#include <sys/errno.h>
| 39 40#include <sys/param.h> 41#include <sys/systm.h> 42#include <sys/socket.h> 43#include <sys/sockio.h> 44#include <sys/mbuf.h> 45#include <sys/errno.h>
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44#include <sys/protosw.h>
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45 46#include <net/if.h> 47#include <net/route.h> 48 49#include <netinet/in.h> 50#include <netinet/in_systm.h> 51#ifdef INET 52#include <netinet/ip.h> 53#endif
| 46 47#include <net/if.h> 48#include <net/route.h> 49 50#include <netinet/in.h> 51#include <netinet/in_systm.h> 52#ifdef INET 53#include <netinet/ip.h> 54#endif
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54#include <netinet6/ip6.h>
| 55#include <netinet/ip_encap.h> 56#ifdef INET6 57#include <netinet/ip6.h>
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55#include <netinet6/ip6_var.h> 56#include <netinet6/in6_gif.h>
| 58#include <netinet6/ip6_var.h> 59#include <netinet6/in6_gif.h>
|
57#include <netinet6/ip6.h>
| 60#include <netinet6/in6_var.h> 61#endif
|
58#include <netinet/ip_ecn.h>
| 62#include <netinet/ip_ecn.h>
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| 63#ifdef INET6
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59#include <netinet6/ip6_ecn.h>
| 64#include <netinet6/ip6_ecn.h>
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| 65#endif
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60 61#include <net/if_gif.h> 62 63#include <net/net_osdep.h> 64
| 66 67#include <net/if_gif.h> 68 69#include <net/net_osdep.h> 70
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| 71#ifndef offsetof 72#define offsetof(s, e) ((int)&((s *)0)->e) 73#endif 74
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65int 66in6_gif_output(ifp, family, m, rt) 67 struct ifnet *ifp; 68 int family; /* family of the packet to be encapsulate. */ 69 struct mbuf *m; 70 struct rtentry *rt; 71{ 72 struct gif_softc *sc = (struct gif_softc*)ifp; 73 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst; 74 struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc; 75 struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst; 76 struct ip6_hdr *ip6; 77 int proto; 78 u_int8_t itos, otos; 79 80 if (sin6_src == NULL || sin6_dst == NULL || 81 sin6_src->sin6_family != AF_INET6 || 82 sin6_dst->sin6_family != AF_INET6) { 83 m_freem(m); 84 return EAFNOSUPPORT; 85 } 86 87 switch (family) { 88#ifdef INET 89 case AF_INET: 90 { 91 struct ip *ip; 92 93 proto = IPPROTO_IPV4; 94 if (m->m_len < sizeof(*ip)) { 95 m = m_pullup(m, sizeof(*ip)); 96 if (!m) 97 return ENOBUFS; 98 } 99 ip = mtod(m, struct ip *); 100 itos = ip->ip_tos; 101 break; 102 } 103#endif
| 75int 76in6_gif_output(ifp, family, m, rt) 77 struct ifnet *ifp; 78 int family; /* family of the packet to be encapsulate. */ 79 struct mbuf *m; 80 struct rtentry *rt; 81{ 82 struct gif_softc *sc = (struct gif_softc*)ifp; 83 struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst; 84 struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc; 85 struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst; 86 struct ip6_hdr *ip6; 87 int proto; 88 u_int8_t itos, otos; 89 90 if (sin6_src == NULL || sin6_dst == NULL || 91 sin6_src->sin6_family != AF_INET6 || 92 sin6_dst->sin6_family != AF_INET6) { 93 m_freem(m); 94 return EAFNOSUPPORT; 95 } 96 97 switch (family) { 98#ifdef INET 99 case AF_INET: 100 { 101 struct ip *ip; 102 103 proto = IPPROTO_IPV4; 104 if (m->m_len < sizeof(*ip)) { 105 m = m_pullup(m, sizeof(*ip)); 106 if (!m) 107 return ENOBUFS; 108 } 109 ip = mtod(m, struct ip *); 110 itos = ip->ip_tos; 111 break; 112 } 113#endif
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| 114#ifdef INET6
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104 case AF_INET6: 105 { 106 struct ip6_hdr *ip6; 107 proto = IPPROTO_IPV6; 108 if (m->m_len < sizeof(*ip6)) { 109 m = m_pullup(m, sizeof(*ip6)); 110 if (!m) 111 return ENOBUFS; 112 } 113 ip6 = mtod(m, struct ip6_hdr *); 114 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 115 break; 116 }
| 115 case AF_INET6: 116 { 117 struct ip6_hdr *ip6; 118 proto = IPPROTO_IPV6; 119 if (m->m_len < sizeof(*ip6)) { 120 m = m_pullup(m, sizeof(*ip6)); 121 if (!m) 122 return ENOBUFS; 123 } 124 ip6 = mtod(m, struct ip6_hdr *); 125 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 126 break; 127 }
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| 128#endif
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117 default:
| 129 default:
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118#ifdef DIAGNOSTIC
| 130#ifdef DEBUG
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119 printf("in6_gif_output: warning: unknown family %d passed\n", 120 family); 121#endif 122 m_freem(m); 123 return EAFNOSUPPORT; 124 }
| 131 printf("in6_gif_output: warning: unknown family %d passed\n", 132 family); 133#endif 134 m_freem(m); 135 return EAFNOSUPPORT; 136 }
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125
| 137
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126 /* prepend new IP header */ 127 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 128 if (m && m->m_len < sizeof(struct ip6_hdr)) 129 m = m_pullup(m, sizeof(struct ip6_hdr)); 130 if (m == NULL) { 131 printf("ENOBUFS in in6_gif_output %d\n", __LINE__); 132 return ENOBUFS; 133 } 134 135 ip6 = mtod(m, struct ip6_hdr *); 136 ip6->ip6_flow = 0;
| 138 /* prepend new IP header */ 139 M_PREPEND(m, sizeof(struct ip6_hdr), M_DONTWAIT); 140 if (m && m->m_len < sizeof(struct ip6_hdr)) 141 m = m_pullup(m, sizeof(struct ip6_hdr)); 142 if (m == NULL) { 143 printf("ENOBUFS in in6_gif_output %d\n", __LINE__); 144 return ENOBUFS; 145 } 146 147 ip6 = mtod(m, struct ip6_hdr *); 148 ip6->ip6_flow = 0;
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137 ip6->ip6_vfc = IPV6_VERSION;
| 149 ip6->ip6_vfc &= ~IPV6_VERSION_MASK; 150 ip6->ip6_vfc |= IPV6_VERSION;
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138 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len); 139 ip6->ip6_nxt = proto; 140 ip6->ip6_hlim = ip6_gif_hlim; 141 ip6->ip6_src = sin6_src->sin6_addr; 142 if (ifp->if_flags & IFF_LINK0) { 143 /* multi-destination mode */ 144 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) 145 ip6->ip6_dst = sin6_dst->sin6_addr; 146 else if (rt) {
| 151 ip6->ip6_plen = htons((u_short)m->m_pkthdr.len); 152 ip6->ip6_nxt = proto; 153 ip6->ip6_hlim = ip6_gif_hlim; 154 ip6->ip6_src = sin6_src->sin6_addr; 155 if (ifp->if_flags & IFF_LINK0) { 156 /* multi-destination mode */ 157 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) 158 ip6->ip6_dst = sin6_dst->sin6_addr; 159 else if (rt) {
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| 160 if (family != AF_INET6) { 161 m_freem(m); 162 return EINVAL; /*XXX*/ 163 }
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147 ip6->ip6_dst = ((struct sockaddr_in6 *)(rt->rt_gateway))->sin6_addr; 148 } else { 149 m_freem(m); 150 return ENETUNREACH; 151 } 152 } else { 153 /* bidirectional configured tunnel mode */ 154 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) 155 ip6->ip6_dst = sin6_dst->sin6_addr; 156 else { 157 m_freem(m); 158 return ENETUNREACH; 159 } 160 } 161 if (ifp->if_flags & IFF_LINK1) { 162 otos = 0; 163 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 164 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 165 } 166 167 if (dst->sin6_family != sin6_dst->sin6_family || 168 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) { 169 /* cache route doesn't match */ 170 bzero(dst, sizeof(*dst)); 171 dst->sin6_family = sin6_dst->sin6_family; 172 dst->sin6_len = sizeof(struct sockaddr_in6); 173 dst->sin6_addr = sin6_dst->sin6_addr; 174 if (sc->gif_ro6.ro_rt) { 175 RTFREE(sc->gif_ro6.ro_rt); 176 sc->gif_ro6.ro_rt = NULL; 177 }
| 164 ip6->ip6_dst = ((struct sockaddr_in6 *)(rt->rt_gateway))->sin6_addr; 165 } else { 166 m_freem(m); 167 return ENETUNREACH; 168 } 169 } else { 170 /* bidirectional configured tunnel mode */ 171 if (!IN6_IS_ADDR_UNSPECIFIED(&sin6_dst->sin6_addr)) 172 ip6->ip6_dst = sin6_dst->sin6_addr; 173 else { 174 m_freem(m); 175 return ENETUNREACH; 176 } 177 } 178 if (ifp->if_flags & IFF_LINK1) { 179 otos = 0; 180 ip_ecn_ingress(ECN_ALLOWED, &otos, &itos); 181 ip6->ip6_flow |= htonl((u_int32_t)otos << 20); 182 } 183 184 if (dst->sin6_family != sin6_dst->sin6_family || 185 !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) { 186 /* cache route doesn't match */ 187 bzero(dst, sizeof(*dst)); 188 dst->sin6_family = sin6_dst->sin6_family; 189 dst->sin6_len = sizeof(struct sockaddr_in6); 190 dst->sin6_addr = sin6_dst->sin6_addr; 191 if (sc->gif_ro6.ro_rt) { 192 RTFREE(sc->gif_ro6.ro_rt); 193 sc->gif_ro6.ro_rt = NULL; 194 }
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| 195#if 0 196 sc->gif_if.if_mtu = GIF_MTU; 197#endif
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178 } 179 180 if (sc->gif_ro6.ro_rt == NULL) { 181 rtalloc((struct route *)&sc->gif_ro6); 182 if (sc->gif_ro6.ro_rt == NULL) { 183 m_freem(m); 184 return ENETUNREACH; 185 }
| 198 } 199 200 if (sc->gif_ro6.ro_rt == NULL) { 201 rtalloc((struct route *)&sc->gif_ro6); 202 if (sc->gif_ro6.ro_rt == NULL) { 203 m_freem(m); 204 return ENETUNREACH; 205 }
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186 }
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187
| 206
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| 207 /* if it constitutes infinite encapsulation, punt. */ 208 if (sc->gif_ro.ro_rt->rt_ifp == ifp) { 209 m_freem(m); 210 return ENETUNREACH; /*XXX*/ 211 } 212#if 0 213 ifp->if_mtu = sc->gif_ro6.ro_rt->rt_ifp->if_mtu 214 - sizeof(struct ip6_hdr); 215#endif 216 } 217 218#ifdef IPV6_MINMTU 219 /* 220 * force fragmentation to minimum MTU, to avoid path MTU discovery. 221 * it is too painful to ask for resend of inner packet, to achieve 222 * path MTU discovery for encapsulated packets. 223 */ 224 return(ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL)); 225#else
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188 return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL));
| 226 return(ip6_output(m, 0, &sc->gif_ro6, 0, 0, NULL));
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| 227#endif
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189} 190 191int in6_gif_input(mp, offp, proto) 192 struct mbuf **mp; 193 int *offp, proto; 194{ 195 struct mbuf *m = *mp;
| 228} 229 230int in6_gif_input(mp, offp, proto) 231 struct mbuf **mp; 232 int *offp, proto; 233{ 234 struct mbuf *m = *mp;
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196 struct gif_softc *sc;
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197 struct ifnet *gifp = NULL; 198 struct ip6_hdr *ip6;
| 235 struct ifnet *gifp = NULL; 236 struct ip6_hdr *ip6;
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199 int i;
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200 int af = 0; 201 u_int32_t otos; 202 203 ip6 = mtod(m, struct ip6_hdr *); 204
| 237 int af = 0; 238 u_int32_t otos; 239 240 ip6 = mtod(m, struct ip6_hdr *); 241
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205#define satoin6(sa) (((struct sockaddr_in6 *)(sa))->sin6_addr) 206 for (i = 0, sc = gif; i < ngif; i++, sc++) { 207 if (sc->gif_psrc == NULL || 208 sc->gif_pdst == NULL || 209 sc->gif_psrc->sa_family != AF_INET6 || 210 sc->gif_pdst->sa_family != AF_INET6) { 211 continue; 212 } 213 if ((sc->gif_if.if_flags & IFF_UP) == 0) 214 continue; 215 if ((sc->gif_if.if_flags & IFF_LINK0) && 216 IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_psrc), &ip6->ip6_dst) && 217 IN6_IS_ADDR_UNSPECIFIED(&satoin6(sc->gif_pdst))) { 218 gifp = &sc->gif_if; 219 continue; 220 } 221 if (IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_psrc), &ip6->ip6_dst) && 222 IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_pdst), &ip6->ip6_src)) { 223 gifp = &sc->gif_if; 224 break; 225 } 226 }
| 242 gifp = (struct ifnet *)encap_getarg(m);
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227
| 243
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228 if (gifp == NULL) {
| 244 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
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229 m_freem(m); 230 ip6stat.ip6s_nogif++; 231 return IPPROTO_DONE; 232 }
| 245 m_freem(m); 246 ip6stat.ip6s_nogif++; 247 return IPPROTO_DONE; 248 }
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233
| 249
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234 otos = ip6->ip6_flow; 235 m_adj(m, *offp); 236 237 switch (proto) { 238#ifdef INET 239 case IPPROTO_IPV4: 240 { 241 struct ip *ip; 242 u_int8_t otos8; 243 af = AF_INET; 244 otos8 = (ntohl(otos) >> 20) & 0xff; 245 if (m->m_len < sizeof(*ip)) { 246 m = m_pullup(m, sizeof(*ip)); 247 if (!m) 248 return IPPROTO_DONE; 249 } 250 ip = mtod(m, struct ip *); 251 if (gifp->if_flags & IFF_LINK1) 252 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos); 253 break; 254 } 255#endif /* INET */
| 250 otos = ip6->ip6_flow; 251 m_adj(m, *offp); 252 253 switch (proto) { 254#ifdef INET 255 case IPPROTO_IPV4: 256 { 257 struct ip *ip; 258 u_int8_t otos8; 259 af = AF_INET; 260 otos8 = (ntohl(otos) >> 20) & 0xff; 261 if (m->m_len < sizeof(*ip)) { 262 m = m_pullup(m, sizeof(*ip)); 263 if (!m) 264 return IPPROTO_DONE; 265 } 266 ip = mtod(m, struct ip *); 267 if (gifp->if_flags & IFF_LINK1) 268 ip_ecn_egress(ECN_ALLOWED, &otos8, &ip->ip_tos); 269 break; 270 } 271#endif /* INET */
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| 272#ifdef INET6
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256 case IPPROTO_IPV6: 257 { 258 struct ip6_hdr *ip6; 259 af = AF_INET6; 260 if (m->m_len < sizeof(*ip6)) { 261 m = m_pullup(m, sizeof(*ip6)); 262 if (!m) 263 return IPPROTO_DONE; 264 } 265 ip6 = mtod(m, struct ip6_hdr *); 266 if (gifp->if_flags & IFF_LINK1) 267 ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow); 268 break; 269 }
| 273 case IPPROTO_IPV6: 274 { 275 struct ip6_hdr *ip6; 276 af = AF_INET6; 277 if (m->m_len < sizeof(*ip6)) { 278 m = m_pullup(m, sizeof(*ip6)); 279 if (!m) 280 return IPPROTO_DONE; 281 } 282 ip6 = mtod(m, struct ip6_hdr *); 283 if (gifp->if_flags & IFF_LINK1) 284 ip6_ecn_egress(ECN_ALLOWED, &otos, &ip6->ip6_flow); 285 break; 286 }
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| 287#endif
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270 default: 271 ip6stat.ip6s_nogif++; 272 m_freem(m); 273 return IPPROTO_DONE; 274 }
| 288 default: 289 ip6stat.ip6s_nogif++; 290 m_freem(m); 291 return IPPROTO_DONE; 292 }
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275
| 293
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276 gif_input(m, af, gifp); 277 return IPPROTO_DONE; 278}
| 294 gif_input(m, af, gifp); 295 return IPPROTO_DONE; 296}
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| 297 298/* 299 * we know that we are in IFF_UP, outer address available, and outer family 300 * matched the physical addr family. see gif_encapcheck(). 301 */ 302int 303gif_encapcheck6(m, off, proto, arg) 304 const struct mbuf *m; 305 int off; 306 int proto; 307 void *arg; 308{ 309 struct ip6_hdr ip6; 310 struct gif_softc *sc; 311 struct sockaddr_in6 *src, *dst; 312 int addrmatch; 313 314 /* sanity check done in caller */ 315 sc = (struct gif_softc *)arg; 316 src = (struct sockaddr_in6 *)sc->gif_psrc; 317 dst = (struct sockaddr_in6 *)sc->gif_pdst; 318 319 /* LINTED const cast */ 320 m_copydata((struct mbuf *)m, 0, sizeof(ip6), (caddr_t)&ip6); 321 322 /* check for address match */ 323 addrmatch = 0; 324 if (IN6_ARE_ADDR_EQUAL(&src->sin6_addr, &ip6.ip6_dst)) 325 addrmatch |= 1; 326 if (IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6.ip6_src)) 327 addrmatch |= 2; 328 else if ((sc->gif_if.if_flags & IFF_LINK0) != 0 && 329 IN6_IS_ADDR_UNSPECIFIED(&dst->sin6_addr)) { 330 addrmatch |= 2; /* we accept any source */ 331 } 332 if (addrmatch != 3) 333 return 0; 334 335 /* martian filters on outer source - done in ip6_input */ 336 337 /* ingress filters on outer source */ 338 if ((m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) { 339 struct sockaddr_in6 sin6; 340 struct rtentry *rt; 341 342 bzero(&sin6, sizeof(sin6)); 343 sin6.sin6_family = AF_INET6; 344 sin6.sin6_len = sizeof(struct sockaddr_in6); 345 sin6.sin6_addr = ip6.ip6_src; 346 /* XXX scopeid */ 347 rt = rtalloc1((struct sockaddr *)&sin6, 0, 0UL); 348 if (!rt) 349 return 0; 350 if (rt->rt_ifp != m->m_pkthdr.rcvif) { 351 rtfree(rt); 352 return 0; 353 } 354 rtfree(rt); 355 } 356 357 /* prioritize: IFF_LINK0 mode is less preferred */ 358 return (sc->gif_if.if_flags & IFF_LINK0) ? 128 : 128 * 2; 359}
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