2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 * $KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
36 #include "opt_inet6.h"
38 #include <sys/param.h>
39 #include <sys/systm.h>
41 #include <sys/kernel.h>
43 #include <sys/malloc.h>
45 #include <sys/module.h>
46 #include <sys/rmlock.h>
47 #include <sys/socket.h>
48 #include <sys/sockio.h>
50 #include <sys/errno.h>
52 #include <sys/sysctl.h>
53 #include <sys/syslog.h>
56 #include <sys/protosw.h>
58 #include <machine/cpu.h>
61 #include <net/if_var.h>
62 #include <net/if_clone.h>
63 #include <net/if_types.h>
64 #include <net/netisr.h>
65 #include <net/route.h>
69 #include <netinet/in.h>
70 #include <netinet/in_systm.h>
71 #include <netinet/ip.h>
72 #include <netinet/ip_ecn.h>
74 #include <netinet/in_var.h>
75 #include <netinet/ip_var.h>
80 #include <netinet/in.h>
82 #include <netinet6/in6_var.h>
83 #include <netinet/ip6.h>
84 #include <netinet6/ip6_ecn.h>
85 #include <netinet6/ip6_var.h>
86 #include <netinet6/scope6_var.h>
87 #include <netinet6/ip6protosw.h>
90 #include <netinet/ip_encap.h>
91 #include <net/ethernet.h>
92 #include <net/if_bridgevar.h>
93 #include <net/if_gif.h>
95 #include <security/mac/mac_framework.h>
97 static const char gifname[] = "gif";
100 * gif_mtx protects a per-vnet gif_softc_list.
102 static VNET_DEFINE(struct mtx, gif_mtx);
103 #define V_gif_mtx VNET(gif_mtx)
104 static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
105 static VNET_DEFINE(LIST_HEAD(, gif_softc), gif_softc_list);
106 #define V_gif_softc_list VNET(gif_softc_list)
107 static struct sx gif_ioctl_sx;
108 SX_SYSINIT(gif_ioctl_sx, &gif_ioctl_sx, "gif_ioctl");
110 #define GIF_LIST_LOCK_INIT(x) mtx_init(&V_gif_mtx, "gif_mtx", \
112 #define GIF_LIST_LOCK_DESTROY(x) mtx_destroy(&V_gif_mtx)
113 #define GIF_LIST_LOCK(x) mtx_lock(&V_gif_mtx)
114 #define GIF_LIST_UNLOCK(x) mtx_unlock(&V_gif_mtx)
116 void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af);
117 void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af);
118 void (*ng_gif_attach_p)(struct ifnet *ifp);
119 void (*ng_gif_detach_p)(struct ifnet *ifp);
121 static int gif_check_nesting(struct ifnet *, struct mbuf *);
122 static int gif_set_tunnel(struct ifnet *, struct sockaddr *,
124 static void gif_delete_tunnel(struct ifnet *);
125 static int gif_ioctl(struct ifnet *, u_long, caddr_t);
126 static int gif_transmit(struct ifnet *, struct mbuf *);
127 static void gif_qflush(struct ifnet *);
128 static int gif_clone_create(struct if_clone *, int, caddr_t);
129 static void gif_clone_destroy(struct ifnet *);
130 static VNET_DEFINE(struct if_clone *, gif_cloner);
131 #define V_gif_cloner VNET(gif_cloner)
133 static int gifmodevent(module_t, int, void *);
135 SYSCTL_DECL(_net_link);
136 static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0,
137 "Generic Tunnel Interface");
140 * This macro controls the default upper limitation on nesting of gif tunnels.
141 * Since, setting a large value to this macro with a careless configuration
142 * may introduce system crash, we don't allow any nestings by default.
143 * If you need to configure nested gif tunnels, you can define this macro
144 * in your kernel configuration file. However, if you do so, please be
145 * careful to configure the tunnels so that it won't make a loop.
147 #define MAX_GIF_NEST 1
149 static VNET_DEFINE(int, max_gif_nesting) = MAX_GIF_NEST;
150 #define V_max_gif_nesting VNET(max_gif_nesting)
151 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW,
152 &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels");
155 * By default, we disallow creation of multiple tunnels between the same
156 * pair of addresses. Some applications require this functionality so
157 * we allow control over this check here.
160 static VNET_DEFINE(int, parallel_tunnels) = 1;
162 static VNET_DEFINE(int, parallel_tunnels) = 0;
164 #define V_parallel_tunnels VNET(parallel_tunnels)
165 SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels,
166 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(parallel_tunnels), 0,
167 "Allow parallel tunnels?");
170 gif_clone_create(struct if_clone *ifc, int unit, caddr_t params)
172 struct gif_softc *sc;
174 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO);
175 sc->gif_fibnum = curthread->td_proc->p_fibnum;
176 GIF2IFP(sc) = if_alloc(IFT_GIF);
178 GIF2IFP(sc)->if_softc = sc;
179 if_initname(GIF2IFP(sc), gifname, unit);
181 GIF2IFP(sc)->if_addrlen = 0;
182 GIF2IFP(sc)->if_mtu = GIF_MTU;
183 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
185 /* turn off ingress filter */
186 GIF2IFP(sc)->if_flags |= IFF_LINK2;
188 GIF2IFP(sc)->if_ioctl = gif_ioctl;
189 GIF2IFP(sc)->if_transmit = gif_transmit;
190 GIF2IFP(sc)->if_qflush = gif_qflush;
191 GIF2IFP(sc)->if_output = gif_output;
192 GIF2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
193 GIF2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
194 if_attach(GIF2IFP(sc));
195 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t));
196 if (ng_gif_attach_p != NULL)
197 (*ng_gif_attach_p)(GIF2IFP(sc));
200 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list);
206 gif_clone_destroy(struct ifnet *ifp)
208 struct gif_softc *sc;
210 sx_xlock(&gif_ioctl_sx);
212 gif_delete_tunnel(ifp);
214 LIST_REMOVE(sc, gif_list);
216 if (ng_gif_detach_p != NULL)
217 (*ng_gif_detach_p)(ifp);
220 ifp->if_softc = NULL;
221 sx_xunlock(&gif_ioctl_sx);
224 GIF_LOCK_DESTROY(sc);
229 vnet_gif_init(const void *unused __unused)
232 LIST_INIT(&V_gif_softc_list);
233 GIF_LIST_LOCK_INIT();
234 V_gif_cloner = if_clone_simple(gifname, gif_clone_create,
235 gif_clone_destroy, 0);
237 VNET_SYSINIT(vnet_gif_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
238 vnet_gif_init, NULL);
241 vnet_gif_uninit(const void *unused __unused)
244 if_clone_detach(V_gif_cloner);
245 GIF_LIST_LOCK_DESTROY();
247 VNET_SYSUNINIT(vnet_gif_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
248 vnet_gif_uninit, NULL);
251 gifmodevent(module_t mod, int type, void *data)
264 static moduledata_t gif_mod = {
270 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
271 MODULE_VERSION(if_gif, 1);
274 gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
278 struct gif_softc *sc;
281 sc = (struct gif_softc *)arg;
282 if (sc == NULL || (GIF2IFP(sc)->if_flags & IFF_UP) == 0)
288 /* no physical address */
289 if (sc->gif_family == 0)
299 case IPPROTO_ETHERIP:
305 /* Bail on short packets */
307 if (m->m_pkthdr.len < sizeof(struct ip))
310 ip = mtod(m, const struct ip *);
314 if (sc->gif_family != AF_INET)
316 ret = in_gif_encapcheck(m, off, proto, arg);
321 if (m->m_pkthdr.len < sizeof(struct ip6_hdr))
323 if (sc->gif_family != AF_INET6)
325 ret = in6_gif_encapcheck(m, off, proto, arg);
335 gif_transmit(struct ifnet *ifp, struct mbuf *m)
337 struct gif_softc *sc;
338 struct etherip_header *eth;
351 error = mac_ifnet_check_transmit(ifp, m);
359 if ((ifp->if_flags & IFF_MONITOR) != 0 ||
360 (ifp->if_flags & IFF_UP) == 0 ||
361 sc->gif_family == 0 ||
362 (error = gif_check_nesting(ifp, m)) != 0) {
366 /* Now pull back the af that we stashed in the csum_data. */
370 af = m->m_pkthdr.csum_data;
371 m->m_flags &= ~(M_BCAST|M_MCAST);
372 M_SETFIB(m, sc->gif_fibnum);
373 BPF_MTAP2(ifp, &af, sizeof(af), m);
374 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
375 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
376 /* inner AF-specific encapsulation */
381 proto = IPPROTO_IPV4;
382 if (m->m_len < sizeof(struct ip))
383 m = m_pullup(m, sizeof(struct ip));
388 ip = mtod(m, struct ip *);
389 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
390 ECN_NOCARE, &ecn, &ip->ip_tos);
395 proto = IPPROTO_IPV6;
396 if (m->m_len < sizeof(struct ip6_hdr))
397 m = m_pullup(m, sizeof(struct ip6_hdr));
403 ip6 = mtod(m, struct ip6_hdr *);
404 ip6_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
405 ECN_NOCARE, &t, &ip6->ip6_flow);
406 ecn = (ntohl(t) >> 20) & 0xff;
410 proto = IPPROTO_ETHERIP;
411 M_PREPEND(m, sizeof(struct etherip_header), M_NOWAIT);
416 eth = mtod(m, struct etherip_header *);
418 eth->eip_ver = ETHERIP_VERSION;
422 error = EAFNOSUPPORT;
426 /* XXX should we check if our outer source is legal? */
427 /* dispatch to output logic based on outer AF */
428 switch (sc->gif_family) {
431 error = in_gif_output(ifp, m, proto, ecn);
436 error = in6_gif_output(ifp, m, proto, ecn);
444 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
449 gif_qflush(struct ifnet *ifp __unused)
454 #define MTAG_GIF 1080679712
456 gif_check_nesting(struct ifnet *ifp, struct mbuf *m)
462 * gif may cause infinite recursion calls when misconfigured.
463 * We'll prevent this by detecting loops.
465 * High nesting level may cause stack exhaustion.
466 * We'll prevent this by introducing upper limit.
470 while ((mtag = m_tag_locate(m, MTAG_GIF, 0, mtag)) != NULL) {
471 if (*(struct ifnet **)(mtag + 1) == ifp) {
472 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp));
477 if (count > V_max_gif_nesting) {
479 "%s: if_output recursively called too many times(%d)\n",
480 if_name(ifp), count);
483 mtag = m_tag_alloc(MTAG_GIF, 0, sizeof(struct ifnet *), M_NOWAIT);
486 *(struct ifnet **)(mtag + 1) = ifp;
487 m_tag_prepend(m, mtag);
492 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
497 if (dst->sa_family == AF_UNSPEC)
498 bcopy(dst->sa_data, &af, sizeof(af));
502 * Now save the af in the inbound pkt csum data, this is a cheat since
503 * we are using the inbound csum_data field to carry the af over to
504 * the gif_transmit() routine, avoiding using yet another mtag.
506 m->m_pkthdr.csum_data = af;
507 return (ifp->if_transmit(ifp, m));
511 gif_input(struct mbuf *m, struct ifnet *ifp, int proto, uint8_t ecn)
513 struct etherip_header *eip;
521 struct gif_softc *sc;
522 struct ether_header *eh;
523 struct ifnet *oldifp;
532 m->m_pkthdr.rcvif = ifp;
538 if (m->m_len < sizeof(struct ip))
539 m = m_pullup(m, sizeof(struct ip));
542 ip = mtod(m, struct ip *);
543 if (ip_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
544 ECN_NOCARE, &ecn, &ip->ip_tos) == 0) {
553 if (m->m_len < sizeof(struct ip6_hdr))
554 m = m_pullup(m, sizeof(struct ip6_hdr));
557 t = htonl((uint32_t)ecn << 20);
558 ip6 = mtod(m, struct ip6_hdr *);
559 if (ip6_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
560 ECN_NOCARE, &t, &ip6->ip6_flow) == 0) {
566 case IPPROTO_ETHERIP:
575 mac_ifnet_create_mbuf(ifp, m);
578 if (bpf_peers_present(ifp->if_bpf)) {
580 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m);
583 if ((ifp->if_flags & IFF_MONITOR) != 0) {
584 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
585 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
590 if (ng_gif_input_p != NULL) {
591 (*ng_gif_input_p)(ifp, &m, af);
597 * Put the packet to the network layer input queue according to the
598 * specified address family.
599 * Note: older versions of gif_input directly called network layer
600 * input functions, e.g. ip6_input, here. We changed the policy to
601 * prevent too many recursive calls of such input functions, which
602 * might cause kernel panic. But the change may introduce another
603 * problem; if the input queue is full, packets are discarded.
604 * The kernel stack overflow really happened, and we believed
605 * queue-full rarely occurs, so we changed the policy.
619 n = sizeof(struct etherip_header) + sizeof(struct ether_header);
624 eip = mtod(m, struct etherip_header *);
625 if (eip->eip_ver != ETHERIP_VERSION) {
626 /* discard unknown versions */
630 m_adj(m, sizeof(struct etherip_header));
632 m->m_flags &= ~(M_BCAST|M_MCAST);
633 m->m_pkthdr.rcvif = ifp;
635 if (ifp->if_bridge) {
637 eh = mtod(m, struct ether_header *);
638 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
639 if (ETHER_IS_BROADCAST(eh->ether_dhost))
640 m->m_flags |= M_BCAST;
642 m->m_flags |= M_MCAST;
643 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
645 BRIDGE_INPUT(ifp, m);
647 if (m != NULL && ifp != oldifp) {
649 * The bridge gave us back itself or one of the
650 * members for which the frame is addressed.
661 if (ng_gif_input_orphan_p != NULL)
662 (*ng_gif_input_orphan_p)(ifp, m, af);
668 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
669 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
670 M_SETFIB(m, ifp->if_fib);
671 netisr_dispatch(isr, m);
674 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
677 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */
679 gif_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
682 struct ifreq *ifr = (struct ifreq*)data;
683 struct sockaddr *dst, *src;
684 struct gif_softc *sc;
686 struct sockaddr_in *sin = NULL;
689 struct sockaddr_in6 *sin6 = NULL;
696 ifp->if_flags |= IFF_UP;
703 if (ifr->ifr_mtu < GIF_MTU_MIN ||
704 ifr->ifr_mtu > GIF_MTU_MAX)
707 ifp->if_mtu = ifr->ifr_mtu;
710 sx_xlock(&gif_ioctl_sx);
720 case SIOCSIFPHYADDR_IN6:
726 src = (struct sockaddr *)
727 &(((struct in_aliasreq *)data)->ifra_addr);
728 dst = (struct sockaddr *)
729 &(((struct in_aliasreq *)data)->ifra_dstaddr);
733 case SIOCSIFPHYADDR_IN6:
734 src = (struct sockaddr *)
735 &(((struct in6_aliasreq *)data)->ifra_addr);
736 dst = (struct sockaddr *)
737 &(((struct in6_aliasreq *)data)->ifra_dstaddr);
743 /* sa_family must be equal */
744 if (src->sa_family != dst->sa_family ||
745 src->sa_len != dst->sa_len)
748 /* validate sa_len */
749 /* check sa_family looks sane for the cmd */
750 switch (src->sa_family) {
753 if (src->sa_len != sizeof(struct sockaddr_in))
755 if (cmd != SIOCSIFPHYADDR) {
756 error = EAFNOSUPPORT;
759 if (satosin(src)->sin_addr.s_addr == INADDR_ANY ||
760 satosin(dst)->sin_addr.s_addr == INADDR_ANY) {
761 error = EADDRNOTAVAIL;
768 if (src->sa_len != sizeof(struct sockaddr_in6))
770 if (cmd != SIOCSIFPHYADDR_IN6) {
771 error = EAFNOSUPPORT;
774 error = EADDRNOTAVAIL;
775 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr)
777 IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr))
780 * Check validity of the scope zone ID of the
781 * addresses, and convert it into the kernel
782 * internal form if necessary.
784 error = sa6_embedscope(satosin6(src), 0);
787 error = sa6_embedscope(satosin6(dst), 0);
793 error = EAFNOSUPPORT;
796 error = gif_set_tunnel(ifp, src, dst);
799 gif_delete_tunnel(ifp);
801 case SIOCGIFPSRCADDR:
802 case SIOCGIFPDSTADDR:
804 case SIOCGIFPSRCADDR_IN6:
805 case SIOCGIFPDSTADDR_IN6:
807 if (sc->gif_family == 0) {
808 error = EADDRNOTAVAIL;
814 case SIOCGIFPSRCADDR:
815 case SIOCGIFPDSTADDR:
816 if (sc->gif_family != AF_INET) {
817 error = EADDRNOTAVAIL;
820 sin = (struct sockaddr_in *)&ifr->ifr_addr;
821 memset(sin, 0, sizeof(*sin));
822 sin->sin_family = AF_INET;
823 sin->sin_len = sizeof(*sin);
827 case SIOCGIFPSRCADDR_IN6:
828 case SIOCGIFPDSTADDR_IN6:
829 if (sc->gif_family != AF_INET6) {
830 error = EADDRNOTAVAIL;
833 sin6 = (struct sockaddr_in6 *)
834 &(((struct in6_ifreq *)data)->ifr_addr);
835 memset(sin6, 0, sizeof(*sin6));
836 sin6->sin6_family = AF_INET6;
837 sin6->sin6_len = sizeof(*sin6);
841 error = EAFNOSUPPORT;
846 case SIOCGIFPSRCADDR:
847 sin->sin_addr = sc->gif_iphdr->ip_src;
849 case SIOCGIFPDSTADDR:
850 sin->sin_addr = sc->gif_iphdr->ip_dst;
854 case SIOCGIFPSRCADDR_IN6:
855 sin6->sin6_addr = sc->gif_ip6hdr->ip6_src;
857 case SIOCGIFPDSTADDR_IN6:
858 sin6->sin6_addr = sc->gif_ip6hdr->ip6_dst;
868 case SIOCGIFPSRCADDR:
869 case SIOCGIFPDSTADDR:
870 error = prison_if(curthread->td_ucred,
871 (struct sockaddr *)sin);
873 memset(sin, 0, sizeof(*sin));
877 case SIOCGIFPSRCADDR_IN6:
878 case SIOCGIFPDSTADDR_IN6:
879 error = prison_if(curthread->td_ucred,
880 (struct sockaddr *)sin6);
882 error = sa6_recoverscope(sin6);
884 memset(sin6, 0, sizeof(*sin6));
889 ifr->ifr_fib = sc->gif_fibnum;
892 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
894 if (ifr->ifr_fib >= rt_numfibs)
897 sc->gif_fibnum = ifr->ifr_fib;
900 options = sc->gif_options;
901 error = copyout(&options, ifr->ifr_data, sizeof(options));
904 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
906 error = copyin(ifr->ifr_data, &options, sizeof(options));
909 if (options & ~GIF_OPTMASK)
912 sc->gif_options = options;
919 sx_xunlock(&gif_ioctl_sx);
924 gif_detach(struct gif_softc *sc)
927 sx_assert(&gif_ioctl_sx, SA_XLOCKED);
928 if (sc->gif_ecookie != NULL)
929 encap_detach(sc->gif_ecookie);
930 sc->gif_ecookie = NULL;
934 gif_attach(struct gif_softc *sc, int af)
937 sx_assert(&gif_ioctl_sx, SA_XLOCKED);
941 return (in_gif_attach(sc));
945 return (in6_gif_attach(sc));
948 return (EAFNOSUPPORT);
952 gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst)
954 struct gif_softc *sc = ifp->if_softc;
955 struct gif_softc *tsc;
967 /* Disallow parallel tunnels unless instructed otherwise. */
968 if (V_parallel_tunnels == 0) {
970 LIST_FOREACH(tsc, &V_gif_softc_list, gif_list) {
971 if (tsc == sc || tsc->gif_family != src->sa_family)
974 if (tsc->gif_family == AF_INET &&
975 tsc->gif_iphdr->ip_src.s_addr ==
976 satosin(src)->sin_addr.s_addr &&
977 tsc->gif_iphdr->ip_dst.s_addr ==
978 satosin(dst)->sin_addr.s_addr) {
979 error = EADDRNOTAVAIL;
985 if (tsc->gif_family == AF_INET6 &&
986 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_src,
987 &satosin6(src)->sin6_addr) &&
988 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_dst,
989 &satosin6(dst)->sin6_addr)) {
990 error = EADDRNOTAVAIL;
998 switch (src->sa_family) {
1001 hdr = ip = malloc(sizeof(struct ip), M_GIF,
1003 ip->ip_src.s_addr = satosin(src)->sin_addr.s_addr;
1004 ip->ip_dst.s_addr = satosin(dst)->sin_addr.s_addr;
1009 hdr = ip6 = malloc(sizeof(struct ip6_hdr), M_GIF,
1011 ip6->ip6_src = satosin6(src)->sin6_addr;
1012 ip6->ip6_dst = satosin6(dst)->sin6_addr;
1013 ip6->ip6_vfc = IPV6_VERSION;
1017 return (EAFNOSUPPORT);
1020 if (sc->gif_family != src->sa_family)
1022 if (sc->gif_family == 0 ||
1023 sc->gif_family != src->sa_family)
1024 error = gif_attach(sc, src->sa_family);
1027 if (sc->gif_family != 0)
1028 free(sc->gif_hdr, M_GIF);
1029 sc->gif_family = src->sa_family;
1032 #if defined(INET) || defined(INET6)
1035 if (error == 0 && sc->gif_family != 0) {
1036 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1037 if_link_state_change(ifp, LINK_STATE_UP);
1039 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1040 if_link_state_change(ifp, LINK_STATE_DOWN);
1046 gif_delete_tunnel(struct ifnet *ifp)
1048 struct gif_softc *sc = ifp->if_softc;
1055 family = sc->gif_family;
1060 free(sc->gif_hdr, M_GIF);
1062 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1063 if_link_state_change(ifp, LINK_STATE_DOWN);