1/* $NetBSD: ip_gre.c,v 1.21 2002/08/14 00:23:30 itojun Exp $ */
| 1/* $NetBSD: ip_gre.c,v 1.21 2002/08/14 00:23:30 itojun Exp $ */
|
2/* $FreeBSD: head/sys/netinet/ip_gre.c 103026 2002-09-06 17:12:50Z sobomax $ */
| 2/* $FreeBSD: head/sys/netinet/ip_gre.c 103032 2002-09-06 18:16:03Z sobomax $ */
|
3
4/*
5 * Copyright (c) 1998 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Heiko W.Rupp <hwr@pilhuhn.de>
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the NetBSD
22 * Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 * contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40/*
41 * deencapsulate tunneled packets and send them on
42 * output half is in net/if_gre.[ch]
43 * This currently handles IPPROTO_GRE, IPPROTO_MOBILE
44 */
45
46#include <sys/cdefs.h>
| 3
4/*
5 * Copyright (c) 1998 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Heiko W.Rupp <hwr@pilhuhn.de>
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the NetBSD
22 * Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 * contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40/*
41 * deencapsulate tunneled packets and send them on
42 * output half is in net/if_gre.[ch]
43 * This currently handles IPPROTO_GRE, IPPROTO_MOBILE
44 */
45
46#include <sys/cdefs.h>
|
47__RCSID("@(#) $FreeBSD: head/sys/netinet/ip_gre.c 103026 2002-09-06 17:12:50Z sobomax $");
| 47__RCSID("@(#) $FreeBSD: head/sys/netinet/ip_gre.c 103032 2002-09-06 18:16:03Z sobomax $");
|
48
49#include "opt_inet.h"
50#include "opt_ns.h"
51#include "opt_atalk.h"
52#include "bpf.h"
53
54#include <sys/param.h>
55#include <sys/systm.h>
56#include <sys/mbuf.h>
57#include <sys/socket.h>
58#include <sys/socketvar.h>
59#include <sys/protosw.h>
60#include <sys/errno.h>
61#include <sys/time.h>
62#include <sys/kernel.h>
63#include <sys/syslog.h>
64#include <net/bpf.h>
65#include <net/ethernet.h>
66#include <net/if.h>
67#include <net/netisr.h>
68#include <net/route.h>
69#include <net/raw_cb.h>
70
71#ifdef INET
72#include <netinet/in.h>
73#include <netinet/in_var.h>
74#include <netinet/in_systm.h>
75#include <netinet/ip.h>
76#include <netinet/ip_var.h>
77#include <netinet/ip_gre.h>
78#include <machine/in_cksum.h>
79#else
80#error ip_gre input without IP?
81#endif
82
83#ifdef NS
84#include <netns/ns.h>
85#include <netns/ns_if.h>
86#endif
87
88#ifdef NETATALK
89#include <netatalk/at.h>
90#include <netatalk/at_var.h>
91#include <netatalk/at_extern.h>
92#endif
93
94/* Needs IP headers. */
95#include <net/if_gre.h>
96
97#include <machine/stdarg.h>
98
99#if 1
100void gre_inet_ntoa(struct in_addr in); /* XXX */
101#endif
102
| 48
49#include "opt_inet.h"
50#include "opt_ns.h"
51#include "opt_atalk.h"
52#include "bpf.h"
53
54#include <sys/param.h>
55#include <sys/systm.h>
56#include <sys/mbuf.h>
57#include <sys/socket.h>
58#include <sys/socketvar.h>
59#include <sys/protosw.h>
60#include <sys/errno.h>
61#include <sys/time.h>
62#include <sys/kernel.h>
63#include <sys/syslog.h>
64#include <net/bpf.h>
65#include <net/ethernet.h>
66#include <net/if.h>
67#include <net/netisr.h>
68#include <net/route.h>
69#include <net/raw_cb.h>
70
71#ifdef INET
72#include <netinet/in.h>
73#include <netinet/in_var.h>
74#include <netinet/in_systm.h>
75#include <netinet/ip.h>
76#include <netinet/ip_var.h>
77#include <netinet/ip_gre.h>
78#include <machine/in_cksum.h>
79#else
80#error ip_gre input without IP?
81#endif
82
83#ifdef NS
84#include <netns/ns.h>
85#include <netns/ns_if.h>
86#endif
87
88#ifdef NETATALK
89#include <netatalk/at.h>
90#include <netatalk/at_var.h>
91#include <netatalk/at_extern.h>
92#endif
93
94/* Needs IP headers. */
95#include <net/if_gre.h>
96
97#include <machine/stdarg.h>
98
99#if 1
100void gre_inet_ntoa(struct in_addr in); /* XXX */
101#endif
102
|
103struct gre_softc *gre_lookup __P((struct mbuf *, u_int8_t));
| 103static struct gre_softc *gre_lookup __P((struct mbuf *, u_int8_t));
|
104
| 104
|
105int gre_input2 __P((struct mbuf *, int, u_char));
| 105static int gre_input2 __P((struct mbuf *, int, u_char));
|
106
107/*
108 * De-encapsulate a packet and feed it back through ip input (this
109 * routine is called whenever IP gets a packet with proto type
110 * IPPROTO_GRE and a local destination address).
111 * This really is simple
112 */
113void
114#if __STDC__
115gre_input(struct mbuf *m, ...)
116#else
117gre_input(m, va_alist)
118 struct mbuf *m;
119 va_dcl
120#endif
121{
122 int off, ret, proto;
123 va_list ap;
124
125 va_start(ap, m);
126 off = va_arg(ap, int);
127 va_end(ap);
128 proto = (mtod(m, struct ip *))->ip_p;
129
130 ret = gre_input2(m, off, proto);
131 /*
132 * ret == 0 : packet not processed, meaning that
133 * no matching tunnel that is up is found.
134 * we inject it to raw ip socket to see if anyone picks it up.
135 */
136 if (ret == 0)
137 rip_input(m, off);
138}
139
140/*
141 * decapsulate.
142 * Does the real work and is called from gre_input() (above)
143 * returns 0 if packet is not yet processed
144 * and 1 if it needs no further processing
145 * proto is the protocol number of the "calling" foo_input()
146 * routine.
147 */
148
| 106
107/*
108 * De-encapsulate a packet and feed it back through ip input (this
109 * routine is called whenever IP gets a packet with proto type
110 * IPPROTO_GRE and a local destination address).
111 * This really is simple
112 */
113void
114#if __STDC__
115gre_input(struct mbuf *m, ...)
116#else
117gre_input(m, va_alist)
118 struct mbuf *m;
119 va_dcl
120#endif
121{
122 int off, ret, proto;
123 va_list ap;
124
125 va_start(ap, m);
126 off = va_arg(ap, int);
127 va_end(ap);
128 proto = (mtod(m, struct ip *))->ip_p;
129
130 ret = gre_input2(m, off, proto);
131 /*
132 * ret == 0 : packet not processed, meaning that
133 * no matching tunnel that is up is found.
134 * we inject it to raw ip socket to see if anyone picks it up.
135 */
136 if (ret == 0)
137 rip_input(m, off);
138}
139
140/*
141 * decapsulate.
142 * Does the real work and is called from gre_input() (above)
143 * returns 0 if packet is not yet processed
144 * and 1 if it needs no further processing
145 * proto is the protocol number of the "calling" foo_input()
146 * routine.
147 */
148
|
149int
| 149static int
|
150gre_input2(struct mbuf *m ,int hlen, u_char proto)
151{
152 struct greip *gip = mtod(m, struct greip *);
153 int s;
154 struct ifqueue *ifq;
155 struct gre_softc *sc;
156 u_short flags;
157
158 if ((sc = gre_lookup(m, proto)) == NULL) {
159 /* No matching tunnel or tunnel is down. */
160 return (0);
161 }
162
163 sc->sc_if.if_ipackets++;
164 sc->sc_if.if_ibytes += m->m_pkthdr.len;
165
166 switch (proto) {
167 case IPPROTO_GRE:
168 hlen += sizeof (struct gre_h);
169
170 /* process GRE flags as packet can be of variable len */
171 flags = ntohs(gip->gi_flags);
172
173 /* Checksum & Offset are present */
174 if ((flags & GRE_CP) | (flags & GRE_RP))
175 hlen += 4;
176 /* We don't support routing fields (variable length) */
177 if (flags & GRE_RP)
178 return(0);
179 if (flags & GRE_KP)
180 hlen += 4;
181 if (flags & GRE_SP)
182 hlen +=4;
183
184 switch (ntohs(gip->gi_ptype)) { /* ethertypes */
185 case ETHERTYPE_IP: /* shouldn't need a schednetisr(), as */
186 ifq = &ipintrq; /* we are in ip_input */
187 break;
188 break;
189#ifdef NS
190 case ETHERTYPE_NS:
191 ifq = &nsintrq;
192 schednetisr(NETISR_NS);
193 break;
194#endif
195#ifdef NETATALK
196 case ETHERTYPE_ATALK:
197 ifq = &atintrq1;
198 schednetisr(NETISR_ATALK);
199 break;
200#endif
201 case ETHERTYPE_IPV6:
202 /* FALLTHROUGH */
203 default: /* others not yet supported */
204 return(0);
205 }
206 break;
207 default:
208 /* others not yet supported */
209 return(0);
210 }
211
212 m->m_data += hlen;
213 m->m_len -= hlen;
214 m->m_pkthdr.len -= hlen;
215
216#if NBPF > 0
217 if (sc->sc_if.if_bpf) {
218 struct mbuf m0;
219 u_int32_t af = AF_INET;
220
221 m0.m_next = m;
222 m0.m_len = 4;
223 m0.m_data = (char *)⁡
224
225 bpf_mtap(&(sc->sc_if), &m0);
226 }
227#endif /*NBPF > 0*/
228
229 m->m_pkthdr.rcvif = &sc->sc_if;
230
231 s = splnet(); /* possible */
232 if (_IF_QFULL(ifq)) {
233 _IF_DROP(ifq);
234 m_freem(m);
235 } else {
236 IF_ENQUEUE(ifq,m);
237 }
238 splx(s);
239
240 return(1); /* packet is done, no further processing needed */
241}
242
243/*
244 * input routine for IPPRPOTO_MOBILE
245 * This is a little bit diffrent from the other modes, as the
246 * encapsulating header was not prepended, but instead inserted
247 * between IP header and payload
248 */
249
250void
251#if __STDC__
252gre_mobile_input(struct mbuf *m, ...)
253#else
254gre_mobile_input(m, va_alist)
255 struct mbuf *m;
256 va_dcl
257#endif
258{
259 struct ip *ip = mtod(m, struct ip *);
260 struct mobip_h *mip = mtod(m, struct mobip_h *);
261 struct ifqueue *ifq;
262 struct gre_softc *sc;
263 int hlen,s;
264 va_list ap;
265 u_char osrc = 0;
266 int msiz;
267
268 va_start(ap,m);
269 hlen = va_arg(ap, int);
270 va_end(ap);
271
272 if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
273 /* No matching tunnel or tunnel is down. */
274 m_freem(m);
275 return;
276 }
277
278 sc->sc_if.if_ipackets++;
279 sc->sc_if.if_ibytes += m->m_pkthdr.len;
280
281 if(ntohs(mip->mh.proto) & MOB_H_SBIT) {
282 osrc = 1;
283 msiz = MOB_H_SIZ_L;
284 mip->mi.ip_src.s_addr = mip->mh.osrc;
285 } else {
286 msiz = MOB_H_SIZ_S;
287 }
288 mip->mi.ip_dst.s_addr = mip->mh.odst;
289 mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
290
291 if (gre_in_cksum((u_short*)&mip->mh,msiz) != 0) {
292 m_freem(m);
293 return;
294 }
295
296 bcopy((caddr_t)(ip) + (ip->ip_hl << 2) + msiz, (caddr_t)(ip) +
297 (ip->ip_hl << 2), m->m_len - msiz - (ip->ip_hl << 2));
298 m->m_len -= msiz;
299 m->m_pkthdr.len -= msiz;
300
301 /*
302 * On FreeBSD, rip_input() supplies us with ip->ip_len
303 * already converted into host byteorder and also decreases
304 * it by the lengh of IP header, however, ip_input() expects
305 * that this field is in the original format (network byteorder
306 * and full size of IP packet), so that adjust accordingly.
307 */
308 ip->ip_len = htons(ip->ip_len + sizeof(struct ip) - msiz);
309
310 ip->ip_sum = 0;
311 ip->ip_sum = in_cksum(m, (ip->ip_hl << 2));
312
313#if NBPF > 0
314 if (sc->sc_if.if_bpf) {
315 struct mbuf m0;
316 u_int af = AF_INET;
317
318 m0.m_next = m;
319 m0.m_len = 4;
320 m0.m_data = (char *)⁡
321
322 bpf_mtap(&(sc->sc_if), &m0);
323 }
324#endif /*NBPFILTER > 0*/
325
326 m->m_pkthdr.rcvif = &sc->sc_if;
327
328 ifq = &ipintrq;
329 s = splnet(); /* possible */
330 if (_IF_QFULL(ifq)) {
331 _IF_DROP(ifq);
332 m_freem(m);
333 } else {
334 IF_ENQUEUE(ifq,m);
335 }
336 splx(s);
337}
338
339/*
340 * Find the gre interface associated with our src/dst/proto set.
341 */
| 150gre_input2(struct mbuf *m ,int hlen, u_char proto)
151{
152 struct greip *gip = mtod(m, struct greip *);
153 int s;
154 struct ifqueue *ifq;
155 struct gre_softc *sc;
156 u_short flags;
157
158 if ((sc = gre_lookup(m, proto)) == NULL) {
159 /* No matching tunnel or tunnel is down. */
160 return (0);
161 }
162
163 sc->sc_if.if_ipackets++;
164 sc->sc_if.if_ibytes += m->m_pkthdr.len;
165
166 switch (proto) {
167 case IPPROTO_GRE:
168 hlen += sizeof (struct gre_h);
169
170 /* process GRE flags as packet can be of variable len */
171 flags = ntohs(gip->gi_flags);
172
173 /* Checksum & Offset are present */
174 if ((flags & GRE_CP) | (flags & GRE_RP))
175 hlen += 4;
176 /* We don't support routing fields (variable length) */
177 if (flags & GRE_RP)
178 return(0);
179 if (flags & GRE_KP)
180 hlen += 4;
181 if (flags & GRE_SP)
182 hlen +=4;
183
184 switch (ntohs(gip->gi_ptype)) { /* ethertypes */
185 case ETHERTYPE_IP: /* shouldn't need a schednetisr(), as */
186 ifq = &ipintrq; /* we are in ip_input */
187 break;
188 break;
189#ifdef NS
190 case ETHERTYPE_NS:
191 ifq = &nsintrq;
192 schednetisr(NETISR_NS);
193 break;
194#endif
195#ifdef NETATALK
196 case ETHERTYPE_ATALK:
197 ifq = &atintrq1;
198 schednetisr(NETISR_ATALK);
199 break;
200#endif
201 case ETHERTYPE_IPV6:
202 /* FALLTHROUGH */
203 default: /* others not yet supported */
204 return(0);
205 }
206 break;
207 default:
208 /* others not yet supported */
209 return(0);
210 }
211
212 m->m_data += hlen;
213 m->m_len -= hlen;
214 m->m_pkthdr.len -= hlen;
215
216#if NBPF > 0
217 if (sc->sc_if.if_bpf) {
218 struct mbuf m0;
219 u_int32_t af = AF_INET;
220
221 m0.m_next = m;
222 m0.m_len = 4;
223 m0.m_data = (char *)⁡
224
225 bpf_mtap(&(sc->sc_if), &m0);
226 }
227#endif /*NBPF > 0*/
228
229 m->m_pkthdr.rcvif = &sc->sc_if;
230
231 s = splnet(); /* possible */
232 if (_IF_QFULL(ifq)) {
233 _IF_DROP(ifq);
234 m_freem(m);
235 } else {
236 IF_ENQUEUE(ifq,m);
237 }
238 splx(s);
239
240 return(1); /* packet is done, no further processing needed */
241}
242
243/*
244 * input routine for IPPRPOTO_MOBILE
245 * This is a little bit diffrent from the other modes, as the
246 * encapsulating header was not prepended, but instead inserted
247 * between IP header and payload
248 */
249
250void
251#if __STDC__
252gre_mobile_input(struct mbuf *m, ...)
253#else
254gre_mobile_input(m, va_alist)
255 struct mbuf *m;
256 va_dcl
257#endif
258{
259 struct ip *ip = mtod(m, struct ip *);
260 struct mobip_h *mip = mtod(m, struct mobip_h *);
261 struct ifqueue *ifq;
262 struct gre_softc *sc;
263 int hlen,s;
264 va_list ap;
265 u_char osrc = 0;
266 int msiz;
267
268 va_start(ap,m);
269 hlen = va_arg(ap, int);
270 va_end(ap);
271
272 if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
273 /* No matching tunnel or tunnel is down. */
274 m_freem(m);
275 return;
276 }
277
278 sc->sc_if.if_ipackets++;
279 sc->sc_if.if_ibytes += m->m_pkthdr.len;
280
281 if(ntohs(mip->mh.proto) & MOB_H_SBIT) {
282 osrc = 1;
283 msiz = MOB_H_SIZ_L;
284 mip->mi.ip_src.s_addr = mip->mh.osrc;
285 } else {
286 msiz = MOB_H_SIZ_S;
287 }
288 mip->mi.ip_dst.s_addr = mip->mh.odst;
289 mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
290
291 if (gre_in_cksum((u_short*)&mip->mh,msiz) != 0) {
292 m_freem(m);
293 return;
294 }
295
296 bcopy((caddr_t)(ip) + (ip->ip_hl << 2) + msiz, (caddr_t)(ip) +
297 (ip->ip_hl << 2), m->m_len - msiz - (ip->ip_hl << 2));
298 m->m_len -= msiz;
299 m->m_pkthdr.len -= msiz;
300
301 /*
302 * On FreeBSD, rip_input() supplies us with ip->ip_len
303 * already converted into host byteorder and also decreases
304 * it by the lengh of IP header, however, ip_input() expects
305 * that this field is in the original format (network byteorder
306 * and full size of IP packet), so that adjust accordingly.
307 */
308 ip->ip_len = htons(ip->ip_len + sizeof(struct ip) - msiz);
309
310 ip->ip_sum = 0;
311 ip->ip_sum = in_cksum(m, (ip->ip_hl << 2));
312
313#if NBPF > 0
314 if (sc->sc_if.if_bpf) {
315 struct mbuf m0;
316 u_int af = AF_INET;
317
318 m0.m_next = m;
319 m0.m_len = 4;
320 m0.m_data = (char *)⁡
321
322 bpf_mtap(&(sc->sc_if), &m0);
323 }
324#endif /*NBPFILTER > 0*/
325
326 m->m_pkthdr.rcvif = &sc->sc_if;
327
328 ifq = &ipintrq;
329 s = splnet(); /* possible */
330 if (_IF_QFULL(ifq)) {
331 _IF_DROP(ifq);
332 m_freem(m);
333 } else {
334 IF_ENQUEUE(ifq,m);
335 }
336 splx(s);
337}
338
339/*
340 * Find the gre interface associated with our src/dst/proto set.
341 */
|
342struct gre_softc *
| 342static struct gre_softc *
|
343gre_lookup(m, proto)
344 struct mbuf *m;
345 u_int8_t proto;
346{
347 struct ip *ip = mtod(m, struct ip *);
348 struct gre_softc *sc;
349
350 for (sc = LIST_FIRST(&gre_softc_list); sc != NULL;
351 sc = LIST_NEXT(sc, sc_list)) {
352 if ((sc->g_dst.s_addr == ip->ip_src.s_addr) &&
353 (sc->g_src.s_addr == ip->ip_dst.s_addr) &&
354 (sc->g_proto == proto) &&
355 ((sc->sc_if.if_flags & IFF_UP) != 0))
356 return (sc);
357 }
358
359 return (NULL);
360}
| 343gre_lookup(m, proto)
344 struct mbuf *m;
345 u_int8_t proto;
346{
347 struct ip *ip = mtod(m, struct ip *);
348 struct gre_softc *sc;
349
350 for (sc = LIST_FIRST(&gre_softc_list); sc != NULL;
351 sc = LIST_NEXT(sc, sc_list)) {
352 if ((sc->g_dst.s_addr == ip->ip_src.s_addr) &&
353 (sc->g_src.s_addr == ip->ip_dst.s_addr) &&
354 (sc->g_proto == proto) &&
355 ((sc->sc_if.if_flags & IFF_UP) != 0))
356 return (sc);
357 }
358
359 return (NULL);
360}
|