2/* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
3
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.
31 */
32
33#include "opt_mrouting.h"
34#include "opt_inet.h"
35#include "opt_inet6.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/socket.h>
40#include <sys/sockio.h>
41#include <sys/mbuf.h>
42#include <sys/errno.h>
43#include <sys/kernel.h>
44#include <sys/sysctl.h>
45
46#include <sys/malloc.h>
47
48#include <net/if.h>
49#include <net/route.h>
50
51#include <netinet/in.h>
52#include <netinet/in_systm.h>
53#include <netinet/ip.h>
54#include <netinet/ip_var.h>
55#include <netinet/in_gif.h>
56#include <netinet/in_var.h>
57#include <netinet/ip_encap.h>
58#include <netinet/ip_ecn.h>
59
60#ifdef INET6
61#include <netinet/ip6.h>
62#endif
63
64#ifdef MROUTING
65#include <netinet/ip_mroute.h>
66#endif /* MROUTING */
67
68#include <net/if_gif.h>
69
70#include <net/net_osdep.h>
71
72static int ip_gif_ttl = GIF_TTL;
73SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
74 &ip_gif_ttl, 0, "");
75
76int
77in_gif_output(ifp, family, m, rt)
78 struct ifnet *ifp;
79 int family;
80 struct mbuf *m;
81 struct rtentry *rt;
82{
83 struct gif_softc *sc = (struct gif_softc*)ifp;
84 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
85 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
86 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
87 struct ip iphdr; /* capsule IP header, host byte ordered */
88 int proto, error;
89 u_int8_t tos;
90
91 if (sin_src == NULL || sin_dst == NULL ||
92 sin_src->sin_family != AF_INET ||
93 sin_dst->sin_family != AF_INET) {
94 m_freem(m);
95 return EAFNOSUPPORT;
96 }
97
98 switch (family) {
99#ifdef INET
100 case AF_INET:
101 {
102 struct ip *ip;
103
104 proto = IPPROTO_IPV4;
105 if (m->m_len < sizeof(*ip)) {
106 m = m_pullup(m, sizeof(*ip));
107 if (!m)
108 return ENOBUFS;
109 }
110 ip = mtod(m, struct ip *);
111 tos = ip->ip_tos;
112 break;
113 }
114#endif /* INET */
115#ifdef INET6
116 case AF_INET6:
117 {
118 struct ip6_hdr *ip6;
119 proto = IPPROTO_IPV6;
120 if (m->m_len < sizeof(*ip6)) {
121 m = m_pullup(m, sizeof(*ip6));
122 if (!m)
123 return ENOBUFS;
124 }
125 ip6 = mtod(m, struct ip6_hdr *);
126 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
127 break;
128 }
129#endif /* INET6 */
130 default:
131#ifdef DEBUG
132 printf("in_gif_output: warning: unknown family %d passed\n",
133 family);
134#endif
135 m_freem(m);
136 return EAFNOSUPPORT;
137 }
138
139 bzero(&iphdr, sizeof(iphdr));
140 iphdr.ip_src = sin_src->sin_addr;
141 /* bidirectional configured tunnel mode */
142 if (sin_dst->sin_addr.s_addr != INADDR_ANY)
143 iphdr.ip_dst = sin_dst->sin_addr;
144 else {
145 m_freem(m);
146 return ENETUNREACH;
147 }
148 iphdr.ip_p = proto;
149 /* version will be set in ip_output() */
150 iphdr.ip_ttl = ip_gif_ttl;
151 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
152 if (ifp->if_flags & IFF_LINK1)
153 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
154 else
155 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
156
157 /* prepend new IP header */
158 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
159 if (m && m->m_len < sizeof(struct ip))
160 m = m_pullup(m, sizeof(struct ip));
161 if (m == NULL) {
162 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
163 return ENOBUFS;
164 }
165 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
166
167 if (dst->sin_family != sin_dst->sin_family ||
168 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
169 /* cache route doesn't match */
170 dst->sin_family = sin_dst->sin_family;
171 dst->sin_len = sizeof(struct sockaddr_in);
172 dst->sin_addr = sin_dst->sin_addr;
173 if (sc->gif_ro.ro_rt) {
174 RTFREE(sc->gif_ro.ro_rt);
175 sc->gif_ro.ro_rt = NULL;
176 }
177#if 0
178 sc->gif_if.if_mtu = GIF_MTU;
179#endif
180 }
181
182 if (sc->gif_ro.ro_rt == NULL) {
183 rtalloc(&sc->gif_ro);
184 if (sc->gif_ro.ro_rt == NULL) {
185 m_freem(m);
186 return ENETUNREACH;
187 }
188
189 /* if it constitutes infinite encapsulation, punt. */
190 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
191 m_freem(m);
192 return ENETUNREACH; /* XXX */
193 }
194#if 0
195 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
196 - sizeof(struct ip);
197#endif
198 }
199
| 2/* $KAME: in_gif.c,v 1.54 2001/05/14 14:02:16 itojun Exp $ */
3
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.
31 */
32
33#include "opt_mrouting.h"
34#include "opt_inet.h"
35#include "opt_inet6.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/socket.h>
40#include <sys/sockio.h>
41#include <sys/mbuf.h>
42#include <sys/errno.h>
43#include <sys/kernel.h>
44#include <sys/sysctl.h>
45
46#include <sys/malloc.h>
47
48#include <net/if.h>
49#include <net/route.h>
50
51#include <netinet/in.h>
52#include <netinet/in_systm.h>
53#include <netinet/ip.h>
54#include <netinet/ip_var.h>
55#include <netinet/in_gif.h>
56#include <netinet/in_var.h>
57#include <netinet/ip_encap.h>
58#include <netinet/ip_ecn.h>
59
60#ifdef INET6
61#include <netinet/ip6.h>
62#endif
63
64#ifdef MROUTING
65#include <netinet/ip_mroute.h>
66#endif /* MROUTING */
67
68#include <net/if_gif.h>
69
70#include <net/net_osdep.h>
71
72static int ip_gif_ttl = GIF_TTL;
73SYSCTL_INT(_net_inet_ip, IPCTL_GIF_TTL, gifttl, CTLFLAG_RW,
74 &ip_gif_ttl, 0, "");
75
76int
77in_gif_output(ifp, family, m, rt)
78 struct ifnet *ifp;
79 int family;
80 struct mbuf *m;
81 struct rtentry *rt;
82{
83 struct gif_softc *sc = (struct gif_softc*)ifp;
84 struct sockaddr_in *dst = (struct sockaddr_in *)&sc->gif_ro.ro_dst;
85 struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
86 struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
87 struct ip iphdr; /* capsule IP header, host byte ordered */
88 int proto, error;
89 u_int8_t tos;
90
91 if (sin_src == NULL || sin_dst == NULL ||
92 sin_src->sin_family != AF_INET ||
93 sin_dst->sin_family != AF_INET) {
94 m_freem(m);
95 return EAFNOSUPPORT;
96 }
97
98 switch (family) {
99#ifdef INET
100 case AF_INET:
101 {
102 struct ip *ip;
103
104 proto = IPPROTO_IPV4;
105 if (m->m_len < sizeof(*ip)) {
106 m = m_pullup(m, sizeof(*ip));
107 if (!m)
108 return ENOBUFS;
109 }
110 ip = mtod(m, struct ip *);
111 tos = ip->ip_tos;
112 break;
113 }
114#endif /* INET */
115#ifdef INET6
116 case AF_INET6:
117 {
118 struct ip6_hdr *ip6;
119 proto = IPPROTO_IPV6;
120 if (m->m_len < sizeof(*ip6)) {
121 m = m_pullup(m, sizeof(*ip6));
122 if (!m)
123 return ENOBUFS;
124 }
125 ip6 = mtod(m, struct ip6_hdr *);
126 tos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
127 break;
128 }
129#endif /* INET6 */
130 default:
131#ifdef DEBUG
132 printf("in_gif_output: warning: unknown family %d passed\n",
133 family);
134#endif
135 m_freem(m);
136 return EAFNOSUPPORT;
137 }
138
139 bzero(&iphdr, sizeof(iphdr));
140 iphdr.ip_src = sin_src->sin_addr;
141 /* bidirectional configured tunnel mode */
142 if (sin_dst->sin_addr.s_addr != INADDR_ANY)
143 iphdr.ip_dst = sin_dst->sin_addr;
144 else {
145 m_freem(m);
146 return ENETUNREACH;
147 }
148 iphdr.ip_p = proto;
149 /* version will be set in ip_output() */
150 iphdr.ip_ttl = ip_gif_ttl;
151 iphdr.ip_len = m->m_pkthdr.len + sizeof(struct ip);
152 if (ifp->if_flags & IFF_LINK1)
153 ip_ecn_ingress(ECN_ALLOWED, &iphdr.ip_tos, &tos);
154 else
155 ip_ecn_ingress(ECN_NOCARE, &iphdr.ip_tos, &tos);
156
157 /* prepend new IP header */
158 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
159 if (m && m->m_len < sizeof(struct ip))
160 m = m_pullup(m, sizeof(struct ip));
161 if (m == NULL) {
162 printf("ENOBUFS in in_gif_output %d\n", __LINE__);
163 return ENOBUFS;
164 }
165 bcopy(&iphdr, mtod(m, struct ip *), sizeof(struct ip));
166
167 if (dst->sin_family != sin_dst->sin_family ||
168 dst->sin_addr.s_addr != sin_dst->sin_addr.s_addr) {
169 /* cache route doesn't match */
170 dst->sin_family = sin_dst->sin_family;
171 dst->sin_len = sizeof(struct sockaddr_in);
172 dst->sin_addr = sin_dst->sin_addr;
173 if (sc->gif_ro.ro_rt) {
174 RTFREE(sc->gif_ro.ro_rt);
175 sc->gif_ro.ro_rt = NULL;
176 }
177#if 0
178 sc->gif_if.if_mtu = GIF_MTU;
179#endif
180 }
181
182 if (sc->gif_ro.ro_rt == NULL) {
183 rtalloc(&sc->gif_ro);
184 if (sc->gif_ro.ro_rt == NULL) {
185 m_freem(m);
186 return ENETUNREACH;
187 }
188
189 /* if it constitutes infinite encapsulation, punt. */
190 if (sc->gif_ro.ro_rt->rt_ifp == ifp) {
191 m_freem(m);
192 return ENETUNREACH; /* XXX */
193 }
194#if 0
195 ifp->if_mtu = sc->gif_ro.ro_rt->rt_ifp->if_mtu
196 - sizeof(struct ip);
197#endif
198 }
199
|
201 return(error);
202}
203
204void
205in_gif_input(m, off)
206 struct mbuf *m;
207 int off;
208{
209 struct ifnet *gifp = NULL;
210 struct ip *ip;
211 int af;
212 u_int8_t otos;
213 int proto;
214
215 ip = mtod(m, struct ip *);
216 proto = ip->ip_p;
217
218 gifp = (struct ifnet *)encap_getarg(m);
219
220 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
221 m_freem(m);
222 ipstat.ips_nogif++;
223 return;
224 }
225
226 otos = ip->ip_tos;
227 m_adj(m, off);
228
229 switch (proto) {
230#ifdef INET
231 case IPPROTO_IPV4:
232 {
233 struct ip *ip;
234 af = AF_INET;
235 if (m->m_len < sizeof(*ip)) {
236 m = m_pullup(m, sizeof(*ip));
237 if (!m)
238 return;
239 }
240 ip = mtod(m, struct ip *);
241 if (gifp->if_flags & IFF_LINK1)
242 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
243 else
244 ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
245 break;
246 }
247#endif
248#ifdef INET6
249 case IPPROTO_IPV6:
250 {
251 struct ip6_hdr *ip6;
252 u_int8_t itos;
253 af = AF_INET6;
254 if (m->m_len < sizeof(*ip6)) {
255 m = m_pullup(m, sizeof(*ip6));
256 if (!m)
257 return;
258 }
259 ip6 = mtod(m, struct ip6_hdr *);
260 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
261 if (gifp->if_flags & IFF_LINK1)
262 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
263 else
264 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
265 ip6->ip6_flow &= ~htonl(0xff << 20);
266 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
267 break;
268 }
269#endif /* INET6 */
270 default:
271 ipstat.ips_nogif++;
272 m_freem(m);
273 return;
274 }
275 gif_input(m, af, gifp);
276 return;
277}
278
279/*
280 * we know that we are in IFF_UP, outer address available, and outer family
281 * matched the physical addr family. see gif_encapcheck().
282 */
283int
284gif_encapcheck4(m, off, proto, arg)
285 const struct mbuf *m;
286 int off;
287 int proto;
288 void *arg;
289{
290 struct ip ip;
291 struct gif_softc *sc;
292 struct sockaddr_in *src, *dst;
293 int addrmatch;
294 struct in_ifaddr *ia4;
295
296 /* sanity check done in caller */
297 sc = (struct gif_softc *)arg;
298 src = (struct sockaddr_in *)sc->gif_psrc;
299 dst = (struct sockaddr_in *)sc->gif_pdst;
300
301 /* LINTED const cast */
302 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
303
304 /* check for address match */
305 addrmatch = 0;
306 if (src->sin_addr.s_addr == ip.ip_dst.s_addr)
307 addrmatch |= 1;
308 if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
309 addrmatch |= 2;
310 if (addrmatch != 3)
311 return 0;
312
313 /* martian filters on outer source - NOT done in ip_input! */
314 if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))
315 return 0;
316 switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
317 case 0: case 127: case 255:
318 return 0;
319 }
320 /* reject packets with broadcast on source */
321 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_link)
322 {
323 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
324 continue;
325 if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
326 return 0;
327 }
328
329 /* ingress filters on outer source */
330 if ((sc->gif_if.if_flags & IFF_LINK2) == 0 &&
331 (m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
332 struct sockaddr_in sin;
333 struct rtentry *rt;
334
335 bzero(&sin, sizeof(sin));
336 sin.sin_family = AF_INET;
337 sin.sin_len = sizeof(struct sockaddr_in);
338 sin.sin_addr = ip.ip_src;
339 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
340 if (!rt || rt->rt_ifp != m->m_pkthdr.rcvif) {
341#if 0
342 log(LOG_WARNING, "%s: packet from 0x%x dropped "
343 "due to ingress filter\n", if_name(&sc->gif_if),
344 (u_int32_t)ntohl(sin.sin_addr.s_addr));
345#endif
346 if (rt)
347 rtfree(rt);
348 return 0;
349 }
350 rtfree(rt);
351 }
352
353 return 32 * 2;
354}
| 201 return(error);
202}
203
204void
205in_gif_input(m, off)
206 struct mbuf *m;
207 int off;
208{
209 struct ifnet *gifp = NULL;
210 struct ip *ip;
211 int af;
212 u_int8_t otos;
213 int proto;
214
215 ip = mtod(m, struct ip *);
216 proto = ip->ip_p;
217
218 gifp = (struct ifnet *)encap_getarg(m);
219
220 if (gifp == NULL || (gifp->if_flags & IFF_UP) == 0) {
221 m_freem(m);
222 ipstat.ips_nogif++;
223 return;
224 }
225
226 otos = ip->ip_tos;
227 m_adj(m, off);
228
229 switch (proto) {
230#ifdef INET
231 case IPPROTO_IPV4:
232 {
233 struct ip *ip;
234 af = AF_INET;
235 if (m->m_len < sizeof(*ip)) {
236 m = m_pullup(m, sizeof(*ip));
237 if (!m)
238 return;
239 }
240 ip = mtod(m, struct ip *);
241 if (gifp->if_flags & IFF_LINK1)
242 ip_ecn_egress(ECN_ALLOWED, &otos, &ip->ip_tos);
243 else
244 ip_ecn_egress(ECN_NOCARE, &otos, &ip->ip_tos);
245 break;
246 }
247#endif
248#ifdef INET6
249 case IPPROTO_IPV6:
250 {
251 struct ip6_hdr *ip6;
252 u_int8_t itos;
253 af = AF_INET6;
254 if (m->m_len < sizeof(*ip6)) {
255 m = m_pullup(m, sizeof(*ip6));
256 if (!m)
257 return;
258 }
259 ip6 = mtod(m, struct ip6_hdr *);
260 itos = (ntohl(ip6->ip6_flow) >> 20) & 0xff;
261 if (gifp->if_flags & IFF_LINK1)
262 ip_ecn_egress(ECN_ALLOWED, &otos, &itos);
263 else
264 ip_ecn_egress(ECN_NOCARE, &otos, &itos);
265 ip6->ip6_flow &= ~htonl(0xff << 20);
266 ip6->ip6_flow |= htonl((u_int32_t)itos << 20);
267 break;
268 }
269#endif /* INET6 */
270 default:
271 ipstat.ips_nogif++;
272 m_freem(m);
273 return;
274 }
275 gif_input(m, af, gifp);
276 return;
277}
278
279/*
280 * we know that we are in IFF_UP, outer address available, and outer family
281 * matched the physical addr family. see gif_encapcheck().
282 */
283int
284gif_encapcheck4(m, off, proto, arg)
285 const struct mbuf *m;
286 int off;
287 int proto;
288 void *arg;
289{
290 struct ip ip;
291 struct gif_softc *sc;
292 struct sockaddr_in *src, *dst;
293 int addrmatch;
294 struct in_ifaddr *ia4;
295
296 /* sanity check done in caller */
297 sc = (struct gif_softc *)arg;
298 src = (struct sockaddr_in *)sc->gif_psrc;
299 dst = (struct sockaddr_in *)sc->gif_pdst;
300
301 /* LINTED const cast */
302 m_copydata(m, 0, sizeof(ip), (caddr_t)&ip);
303
304 /* check for address match */
305 addrmatch = 0;
306 if (src->sin_addr.s_addr == ip.ip_dst.s_addr)
307 addrmatch |= 1;
308 if (dst->sin_addr.s_addr == ip.ip_src.s_addr)
309 addrmatch |= 2;
310 if (addrmatch != 3)
311 return 0;
312
313 /* martian filters on outer source - NOT done in ip_input! */
314 if (IN_MULTICAST(ntohl(ip.ip_src.s_addr)))
315 return 0;
316 switch ((ntohl(ip.ip_src.s_addr) & 0xff000000) >> 24) {
317 case 0: case 127: case 255:
318 return 0;
319 }
320 /* reject packets with broadcast on source */
321 TAILQ_FOREACH(ia4, &in_ifaddrhead, ia_link)
322 {
323 if ((ia4->ia_ifa.ifa_ifp->if_flags & IFF_BROADCAST) == 0)
324 continue;
325 if (ip.ip_src.s_addr == ia4->ia_broadaddr.sin_addr.s_addr)
326 return 0;
327 }
328
329 /* ingress filters on outer source */
330 if ((sc->gif_if.if_flags & IFF_LINK2) == 0 &&
331 (m->m_flags & M_PKTHDR) != 0 && m->m_pkthdr.rcvif) {
332 struct sockaddr_in sin;
333 struct rtentry *rt;
334
335 bzero(&sin, sizeof(sin));
336 sin.sin_family = AF_INET;
337 sin.sin_len = sizeof(struct sockaddr_in);
338 sin.sin_addr = ip.ip_src;
339 rt = rtalloc1((struct sockaddr *)&sin, 0, 0UL);
340 if (!rt || rt->rt_ifp != m->m_pkthdr.rcvif) {
341#if 0
342 log(LOG_WARNING, "%s: packet from 0x%x dropped "
343 "due to ingress filter\n", if_name(&sc->gif_if),
344 (u_int32_t)ntohl(sin.sin_addr.s_addr));
345#endif
346 if (rt)
347 rtfree(rt);
348 return 0;
349 }
350 rtfree(rt);
351 }
352
353 return 32 * 2;
354}
|