2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $KAME: if_gif.c,v 1.87 2001/10/19 08:50:27 itojun Exp $
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
38 #include "opt_inet6.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
43 #include <sys/kernel.h>
45 #include <sys/malloc.h>
47 #include <sys/module.h>
48 #include <sys/rmlock.h>
49 #include <sys/socket.h>
50 #include <sys/sockio.h>
52 #include <sys/errno.h>
54 #include <sys/sysctl.h>
55 #include <sys/syslog.h>
58 #include <sys/protosw.h>
60 #include <machine/cpu.h>
63 #include <net/if_var.h>
64 #include <net/if_clone.h>
65 #include <net/if_types.h>
66 #include <net/netisr.h>
67 #include <net/route.h>
71 #include <netinet/in.h>
72 #include <netinet/in_systm.h>
73 #include <netinet/ip.h>
74 #include <netinet/ip_ecn.h>
76 #include <netinet/in_var.h>
77 #include <netinet/ip_var.h>
82 #include <netinet/in.h>
84 #include <netinet6/in6_var.h>
85 #include <netinet/ip6.h>
86 #include <netinet6/ip6_ecn.h>
87 #include <netinet6/ip6_var.h>
88 #include <netinet6/scope6_var.h>
89 #include <netinet6/ip6protosw.h>
92 #include <netinet/ip_encap.h>
93 #include <net/ethernet.h>
94 #include <net/if_bridgevar.h>
95 #include <net/if_gif.h>
97 #include <security/mac/mac_framework.h>
99 static const char gifname[] = "gif";
102 * gif_mtx protects a per-vnet gif_softc_list.
104 static VNET_DEFINE(struct mtx, gif_mtx);
105 #define V_gif_mtx VNET(gif_mtx)
106 static MALLOC_DEFINE(M_GIF, "gif", "Generic Tunnel Interface");
107 static VNET_DEFINE(LIST_HEAD(, gif_softc), gif_softc_list);
108 #define V_gif_softc_list VNET(gif_softc_list)
109 static struct sx gif_ioctl_sx;
110 SX_SYSINIT(gif_ioctl_sx, &gif_ioctl_sx, "gif_ioctl");
112 #define GIF_LIST_LOCK_INIT(x) mtx_init(&V_gif_mtx, "gif_mtx", \
114 #define GIF_LIST_LOCK_DESTROY(x) mtx_destroy(&V_gif_mtx)
115 #define GIF_LIST_LOCK(x) mtx_lock(&V_gif_mtx)
116 #define GIF_LIST_UNLOCK(x) mtx_unlock(&V_gif_mtx)
118 void (*ng_gif_input_p)(struct ifnet *ifp, struct mbuf **mp, int af);
119 void (*ng_gif_input_orphan_p)(struct ifnet *ifp, struct mbuf *m, int af);
120 void (*ng_gif_attach_p)(struct ifnet *ifp);
121 void (*ng_gif_detach_p)(struct ifnet *ifp);
123 static int gif_check_nesting(struct ifnet *, struct mbuf *);
124 static int gif_set_tunnel(struct ifnet *, struct sockaddr *,
126 static void gif_delete_tunnel(struct ifnet *);
127 static int gif_ioctl(struct ifnet *, u_long, caddr_t);
128 static int gif_transmit(struct ifnet *, struct mbuf *);
129 static void gif_qflush(struct ifnet *);
130 static int gif_clone_create(struct if_clone *, int, caddr_t);
131 static void gif_clone_destroy(struct ifnet *);
132 static VNET_DEFINE(struct if_clone *, gif_cloner);
133 #define V_gif_cloner VNET(gif_cloner)
135 static int gifmodevent(module_t, int, void *);
137 SYSCTL_DECL(_net_link);
138 static SYSCTL_NODE(_net_link, IFT_GIF, gif, CTLFLAG_RW, 0,
139 "Generic Tunnel Interface");
142 * This macro controls the default upper limitation on nesting of gif tunnels.
143 * Since, setting a large value to this macro with a careless configuration
144 * may introduce system crash, we don't allow any nestings by default.
145 * If you need to configure nested gif tunnels, you can define this macro
146 * in your kernel configuration file. However, if you do so, please be
147 * careful to configure the tunnels so that it won't make a loop.
149 #define MAX_GIF_NEST 1
151 static VNET_DEFINE(int, max_gif_nesting) = MAX_GIF_NEST;
152 #define V_max_gif_nesting VNET(max_gif_nesting)
153 SYSCTL_INT(_net_link_gif, OID_AUTO, max_nesting, CTLFLAG_VNET | CTLFLAG_RW,
154 &VNET_NAME(max_gif_nesting), 0, "Max nested tunnels");
157 * By default, we disallow creation of multiple tunnels between the same
158 * pair of addresses. Some applications require this functionality so
159 * we allow control over this check here.
162 static VNET_DEFINE(int, parallel_tunnels) = 1;
164 static VNET_DEFINE(int, parallel_tunnels) = 0;
166 #define V_parallel_tunnels VNET(parallel_tunnels)
167 SYSCTL_INT(_net_link_gif, OID_AUTO, parallel_tunnels,
168 CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(parallel_tunnels), 0,
169 "Allow parallel tunnels?");
172 gif_clone_create(struct if_clone *ifc, int unit, caddr_t params)
174 struct gif_softc *sc;
176 sc = malloc(sizeof(struct gif_softc), M_GIF, M_WAITOK | M_ZERO);
177 sc->gif_fibnum = curthread->td_proc->p_fibnum;
178 GIF2IFP(sc) = if_alloc(IFT_GIF);
180 GIF2IFP(sc)->if_softc = sc;
181 if_initname(GIF2IFP(sc), gifname, unit);
183 GIF2IFP(sc)->if_addrlen = 0;
184 GIF2IFP(sc)->if_mtu = GIF_MTU;
185 GIF2IFP(sc)->if_flags = IFF_POINTOPOINT | IFF_MULTICAST;
187 /* turn off ingress filter */
188 GIF2IFP(sc)->if_flags |= IFF_LINK2;
190 GIF2IFP(sc)->if_ioctl = gif_ioctl;
191 GIF2IFP(sc)->if_transmit = gif_transmit;
192 GIF2IFP(sc)->if_qflush = gif_qflush;
193 GIF2IFP(sc)->if_output = gif_output;
194 GIF2IFP(sc)->if_capabilities |= IFCAP_LINKSTATE;
195 GIF2IFP(sc)->if_capenable |= IFCAP_LINKSTATE;
196 if_attach(GIF2IFP(sc));
197 bpfattach(GIF2IFP(sc), DLT_NULL, sizeof(u_int32_t));
198 if (ng_gif_attach_p != NULL)
199 (*ng_gif_attach_p)(GIF2IFP(sc));
202 LIST_INSERT_HEAD(&V_gif_softc_list, sc, gif_list);
208 gif_clone_destroy(struct ifnet *ifp)
210 struct gif_softc *sc;
212 sx_xlock(&gif_ioctl_sx);
214 gif_delete_tunnel(ifp);
216 LIST_REMOVE(sc, gif_list);
218 if (ng_gif_detach_p != NULL)
219 (*ng_gif_detach_p)(ifp);
222 ifp->if_softc = NULL;
223 sx_xunlock(&gif_ioctl_sx);
226 GIF_LOCK_DESTROY(sc);
231 vnet_gif_init(const void *unused __unused)
234 LIST_INIT(&V_gif_softc_list);
235 GIF_LIST_LOCK_INIT();
236 V_gif_cloner = if_clone_simple(gifname, gif_clone_create,
237 gif_clone_destroy, 0);
239 VNET_SYSINIT(vnet_gif_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
240 vnet_gif_init, NULL);
243 vnet_gif_uninit(const void *unused __unused)
246 if_clone_detach(V_gif_cloner);
247 GIF_LIST_LOCK_DESTROY();
249 VNET_SYSUNINIT(vnet_gif_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY,
250 vnet_gif_uninit, NULL);
253 gifmodevent(module_t mod, int type, void *data)
266 static moduledata_t gif_mod = {
272 DECLARE_MODULE(if_gif, gif_mod, SI_SUB_PSEUDO, SI_ORDER_ANY);
273 MODULE_VERSION(if_gif, 1);
276 gif_encapcheck(const struct mbuf *m, int off, int proto, void *arg)
280 struct gif_softc *sc;
283 sc = (struct gif_softc *)arg;
284 if (sc == NULL || (GIF2IFP(sc)->if_flags & IFF_UP) == 0)
290 /* no physical address */
291 if (sc->gif_family == 0)
301 case IPPROTO_ETHERIP:
307 /* Bail on short packets */
309 if (m->m_pkthdr.len < sizeof(struct ip))
312 ip = mtod(m, const struct ip *);
316 if (sc->gif_family != AF_INET)
318 ret = in_gif_encapcheck(m, off, proto, arg);
323 if (m->m_pkthdr.len < sizeof(struct ip6_hdr))
325 if (sc->gif_family != AF_INET6)
327 ret = in6_gif_encapcheck(m, off, proto, arg);
337 gif_transmit(struct ifnet *ifp, struct mbuf *m)
339 struct gif_softc *sc;
340 struct etherip_header *eth;
353 error = mac_ifnet_check_transmit(ifp, m);
361 if ((ifp->if_flags & IFF_MONITOR) != 0 ||
362 (ifp->if_flags & IFF_UP) == 0 ||
363 sc->gif_family == 0 ||
364 (error = gif_check_nesting(ifp, m)) != 0) {
368 /* Now pull back the af that we stashed in the csum_data. */
372 af = m->m_pkthdr.csum_data;
373 m->m_flags &= ~(M_BCAST|M_MCAST);
374 M_SETFIB(m, sc->gif_fibnum);
375 BPF_MTAP2(ifp, &af, sizeof(af), m);
376 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
377 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
378 /* inner AF-specific encapsulation */
383 proto = IPPROTO_IPV4;
384 if (m->m_len < sizeof(struct ip))
385 m = m_pullup(m, sizeof(struct ip));
390 ip = mtod(m, struct ip *);
391 ip_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
392 ECN_NOCARE, &ecn, &ip->ip_tos);
397 proto = IPPROTO_IPV6;
398 if (m->m_len < sizeof(struct ip6_hdr))
399 m = m_pullup(m, sizeof(struct ip6_hdr));
405 ip6 = mtod(m, struct ip6_hdr *);
406 ip6_ecn_ingress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
407 ECN_NOCARE, &t, &ip6->ip6_flow);
408 ecn = (ntohl(t) >> 20) & 0xff;
412 proto = IPPROTO_ETHERIP;
413 M_PREPEND(m, sizeof(struct etherip_header), M_NOWAIT);
418 eth = mtod(m, struct etherip_header *);
420 eth->eip_ver = ETHERIP_VERSION;
424 error = EAFNOSUPPORT;
428 /* XXX should we check if our outer source is legal? */
429 /* dispatch to output logic based on outer AF */
430 switch (sc->gif_family) {
433 error = in_gif_output(ifp, m, proto, ecn);
438 error = in6_gif_output(ifp, m, proto, ecn);
446 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
451 gif_qflush(struct ifnet *ifp __unused)
456 #define MTAG_GIF 1080679712
458 gif_check_nesting(struct ifnet *ifp, struct mbuf *m)
464 * gif may cause infinite recursion calls when misconfigured.
465 * We'll prevent this by detecting loops.
467 * High nesting level may cause stack exhaustion.
468 * We'll prevent this by introducing upper limit.
472 while ((mtag = m_tag_locate(m, MTAG_GIF, 0, mtag)) != NULL) {
473 if (*(struct ifnet **)(mtag + 1) == ifp) {
474 log(LOG_NOTICE, "%s: loop detected\n", if_name(ifp));
479 if (count > V_max_gif_nesting) {
481 "%s: if_output recursively called too many times(%d)\n",
482 if_name(ifp), count);
485 mtag = m_tag_alloc(MTAG_GIF, 0, sizeof(struct ifnet *), M_NOWAIT);
488 *(struct ifnet **)(mtag + 1) = ifp;
489 m_tag_prepend(m, mtag);
494 gif_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst,
499 if (dst->sa_family == AF_UNSPEC)
500 bcopy(dst->sa_data, &af, sizeof(af));
504 * Now save the af in the inbound pkt csum data, this is a cheat since
505 * we are using the inbound csum_data field to carry the af over to
506 * the gif_transmit() routine, avoiding using yet another mtag.
508 m->m_pkthdr.csum_data = af;
509 return (ifp->if_transmit(ifp, m));
513 gif_input(struct mbuf *m, struct ifnet *ifp, int proto, uint8_t ecn)
515 struct etherip_header *eip;
523 struct ether_header *eh;
524 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_data_get_ptr(ifr),
905 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
907 error = copyin(ifr_data_get_ptr(ifr), &options,
911 if (options & ~GIF_OPTMASK)
914 sc->gif_options = options;
921 sx_xunlock(&gif_ioctl_sx);
926 gif_detach(struct gif_softc *sc)
929 sx_assert(&gif_ioctl_sx, SA_XLOCKED);
930 if (sc->gif_ecookie != NULL)
931 encap_detach(sc->gif_ecookie);
932 sc->gif_ecookie = NULL;
936 gif_attach(struct gif_softc *sc, int af)
939 sx_assert(&gif_ioctl_sx, SA_XLOCKED);
943 return (in_gif_attach(sc));
947 return (in6_gif_attach(sc));
950 return (EAFNOSUPPORT);
954 gif_set_tunnel(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst)
956 struct gif_softc *sc = ifp->if_softc;
957 struct gif_softc *tsc;
969 /* Disallow parallel tunnels unless instructed otherwise. */
970 if (V_parallel_tunnels == 0) {
972 LIST_FOREACH(tsc, &V_gif_softc_list, gif_list) {
973 if (tsc == sc || tsc->gif_family != src->sa_family)
976 if (tsc->gif_family == AF_INET &&
977 tsc->gif_iphdr->ip_src.s_addr ==
978 satosin(src)->sin_addr.s_addr &&
979 tsc->gif_iphdr->ip_dst.s_addr ==
980 satosin(dst)->sin_addr.s_addr) {
981 error = EADDRNOTAVAIL;
987 if (tsc->gif_family == AF_INET6 &&
988 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_src,
989 &satosin6(src)->sin6_addr) &&
990 IN6_ARE_ADDR_EQUAL(&tsc->gif_ip6hdr->ip6_dst,
991 &satosin6(dst)->sin6_addr)) {
992 error = EADDRNOTAVAIL;
1000 switch (src->sa_family) {
1003 hdr = ip = malloc(sizeof(struct ip), M_GIF,
1005 ip->ip_src.s_addr = satosin(src)->sin_addr.s_addr;
1006 ip->ip_dst.s_addr = satosin(dst)->sin_addr.s_addr;
1011 hdr = ip6 = malloc(sizeof(struct ip6_hdr), M_GIF,
1013 ip6->ip6_src = satosin6(src)->sin6_addr;
1014 ip6->ip6_dst = satosin6(dst)->sin6_addr;
1015 ip6->ip6_vfc = IPV6_VERSION;
1019 return (EAFNOSUPPORT);
1022 if (sc->gif_family != src->sa_family)
1024 if (sc->gif_family == 0 ||
1025 sc->gif_family != src->sa_family)
1026 error = gif_attach(sc, src->sa_family);
1029 if (sc->gif_family != 0)
1030 free(sc->gif_hdr, M_GIF);
1031 sc->gif_family = src->sa_family;
1034 #if defined(INET) || defined(INET6)
1037 if (error == 0 && sc->gif_family != 0) {
1038 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1039 if_link_state_change(ifp, LINK_STATE_UP);
1041 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1042 if_link_state_change(ifp, LINK_STATE_DOWN);
1048 gif_delete_tunnel(struct ifnet *ifp)
1050 struct gif_softc *sc = ifp->if_softc;
1057 family = sc->gif_family;
1062 free(sc->gif_hdr, M_GIF);
1064 ifp->if_drv_flags &= ~IFF_DRV_RUNNING;
1065 if_link_state_change(ifp, LINK_STATE_DOWN);