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 gif_softc *sc;
524 struct ether_header *eh;
525 struct ifnet *oldifp;
534 m->m_pkthdr.rcvif = ifp;
540 if (m->m_len < sizeof(struct ip))
541 m = m_pullup(m, sizeof(struct ip));
544 ip = mtod(m, struct ip *);
545 if (ip_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
546 ECN_NOCARE, &ecn, &ip->ip_tos) == 0) {
555 if (m->m_len < sizeof(struct ip6_hdr))
556 m = m_pullup(m, sizeof(struct ip6_hdr));
559 t = htonl((uint32_t)ecn << 20);
560 ip6 = mtod(m, struct ip6_hdr *);
561 if (ip6_ecn_egress((ifp->if_flags & IFF_LINK1) ? ECN_ALLOWED:
562 ECN_NOCARE, &t, &ip6->ip6_flow) == 0) {
568 case IPPROTO_ETHERIP:
577 mac_ifnet_create_mbuf(ifp, m);
580 if (bpf_peers_present(ifp->if_bpf)) {
582 bpf_mtap2(ifp->if_bpf, &af1, sizeof(af1), m);
585 if ((ifp->if_flags & IFF_MONITOR) != 0) {
586 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
587 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
592 if (ng_gif_input_p != NULL) {
593 (*ng_gif_input_p)(ifp, &m, af);
599 * Put the packet to the network layer input queue according to the
600 * specified address family.
601 * Note: older versions of gif_input directly called network layer
602 * input functions, e.g. ip6_input, here. We changed the policy to
603 * prevent too many recursive calls of such input functions, which
604 * might cause kernel panic. But the change may introduce another
605 * problem; if the input queue is full, packets are discarded.
606 * The kernel stack overflow really happened, and we believed
607 * queue-full rarely occurs, so we changed the policy.
621 n = sizeof(struct etherip_header) + sizeof(struct ether_header);
626 eip = mtod(m, struct etherip_header *);
627 if (eip->eip_ver != ETHERIP_VERSION) {
628 /* discard unknown versions */
632 m_adj(m, sizeof(struct etherip_header));
634 m->m_flags &= ~(M_BCAST|M_MCAST);
635 m->m_pkthdr.rcvif = ifp;
637 if (ifp->if_bridge) {
639 eh = mtod(m, struct ether_header *);
640 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
641 if (ETHER_IS_BROADCAST(eh->ether_dhost))
642 m->m_flags |= M_BCAST;
644 m->m_flags |= M_MCAST;
645 if_inc_counter(ifp, IFCOUNTER_IMCASTS, 1);
647 BRIDGE_INPUT(ifp, m);
649 if (m != NULL && ifp != oldifp) {
651 * The bridge gave us back itself or one of the
652 * members for which the frame is addressed.
663 if (ng_gif_input_orphan_p != NULL)
664 (*ng_gif_input_orphan_p)(ifp, m, af);
670 if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1);
671 if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len);
672 M_SETFIB(m, ifp->if_fib);
673 netisr_dispatch(isr, m);
676 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
679 /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */
681 gif_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
684 struct ifreq *ifr = (struct ifreq*)data;
685 struct sockaddr *dst, *src;
686 struct gif_softc *sc;
688 struct sockaddr_in *sin = NULL;
691 struct sockaddr_in6 *sin6 = NULL;
698 ifp->if_flags |= IFF_UP;
705 if (ifr->ifr_mtu < GIF_MTU_MIN ||
706 ifr->ifr_mtu > GIF_MTU_MAX)
709 ifp->if_mtu = ifr->ifr_mtu;
712 sx_xlock(&gif_ioctl_sx);
722 case SIOCSIFPHYADDR_IN6:
728 src = (struct sockaddr *)
729 &(((struct in_aliasreq *)data)->ifra_addr);
730 dst = (struct sockaddr *)
731 &(((struct in_aliasreq *)data)->ifra_dstaddr);
735 case SIOCSIFPHYADDR_IN6:
736 src = (struct sockaddr *)
737 &(((struct in6_aliasreq *)data)->ifra_addr);
738 dst = (struct sockaddr *)
739 &(((struct in6_aliasreq *)data)->ifra_dstaddr);
745 /* sa_family must be equal */
746 if (src->sa_family != dst->sa_family ||
747 src->sa_len != dst->sa_len)
750 /* validate sa_len */
751 /* check sa_family looks sane for the cmd */
752 switch (src->sa_family) {
755 if (src->sa_len != sizeof(struct sockaddr_in))
757 if (cmd != SIOCSIFPHYADDR) {
758 error = EAFNOSUPPORT;
761 if (satosin(src)->sin_addr.s_addr == INADDR_ANY ||
762 satosin(dst)->sin_addr.s_addr == INADDR_ANY) {
763 error = EADDRNOTAVAIL;
770 if (src->sa_len != sizeof(struct sockaddr_in6))
772 if (cmd != SIOCSIFPHYADDR_IN6) {
773 error = EAFNOSUPPORT;
776 error = EADDRNOTAVAIL;
777 if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr)
779 IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr))
782 * Check validity of the scope zone ID of the
783 * addresses, and convert it into the kernel
784 * internal form if necessary.
786 error = sa6_embedscope(satosin6(src), 0);
789 error = sa6_embedscope(satosin6(dst), 0);
795 error = EAFNOSUPPORT;
798 error = gif_set_tunnel(ifp, src, dst);
801 gif_delete_tunnel(ifp);
803 case SIOCGIFPSRCADDR:
804 case SIOCGIFPDSTADDR:
806 case SIOCGIFPSRCADDR_IN6:
807 case SIOCGIFPDSTADDR_IN6:
809 if (sc->gif_family == 0) {
810 error = EADDRNOTAVAIL;
816 case SIOCGIFPSRCADDR:
817 case SIOCGIFPDSTADDR:
818 if (sc->gif_family != AF_INET) {
819 error = EADDRNOTAVAIL;
822 sin = (struct sockaddr_in *)&ifr->ifr_addr;
823 memset(sin, 0, sizeof(*sin));
824 sin->sin_family = AF_INET;
825 sin->sin_len = sizeof(*sin);
829 case SIOCGIFPSRCADDR_IN6:
830 case SIOCGIFPDSTADDR_IN6:
831 if (sc->gif_family != AF_INET6) {
832 error = EADDRNOTAVAIL;
835 sin6 = (struct sockaddr_in6 *)
836 &(((struct in6_ifreq *)data)->ifr_addr);
837 memset(sin6, 0, sizeof(*sin6));
838 sin6->sin6_family = AF_INET6;
839 sin6->sin6_len = sizeof(*sin6);
843 error = EAFNOSUPPORT;
848 case SIOCGIFPSRCADDR:
849 sin->sin_addr = sc->gif_iphdr->ip_src;
851 case SIOCGIFPDSTADDR:
852 sin->sin_addr = sc->gif_iphdr->ip_dst;
856 case SIOCGIFPSRCADDR_IN6:
857 sin6->sin6_addr = sc->gif_ip6hdr->ip6_src;
859 case SIOCGIFPDSTADDR_IN6:
860 sin6->sin6_addr = sc->gif_ip6hdr->ip6_dst;
870 case SIOCGIFPSRCADDR:
871 case SIOCGIFPDSTADDR:
872 error = prison_if(curthread->td_ucred,
873 (struct sockaddr *)sin);
875 memset(sin, 0, sizeof(*sin));
879 case SIOCGIFPSRCADDR_IN6:
880 case SIOCGIFPDSTADDR_IN6:
881 error = prison_if(curthread->td_ucred,
882 (struct sockaddr *)sin6);
884 error = sa6_recoverscope(sin6);
886 memset(sin6, 0, sizeof(*sin6));
891 ifr->ifr_fib = sc->gif_fibnum;
894 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
896 if (ifr->ifr_fib >= rt_numfibs)
899 sc->gif_fibnum = ifr->ifr_fib;
902 options = sc->gif_options;
903 error = copyout(&options, ifr->ifr_data, sizeof(options));
906 if ((error = priv_check(curthread, PRIV_NET_GIF)) != 0)
908 error = copyin(ifr->ifr_data, &options, sizeof(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);