/* $OpenBSD: if_gif.c,v 1.7 2000/01/17 06:29:27 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * gif.c */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #include #include #include #endif /* INET */ #ifdef INET6 #ifndef INET #include #endif #include #include #include #include #endif /* INET6 */ #include #include "gif.h" #include "bpfilter.h" #include #if NGIF > 0 void gifattach __P((int)); /* * gif global variable definitions */ int ngif = NGIF; /* number of interfaces */ struct gif_softc *gif = 0; void gifattach(dummy) int dummy; { register struct gif_softc *sc; register int i; gif = sc = malloc (ngif * sizeof(struct gif_softc), M_DEVBUF, M_WAIT); bzero(sc, ngif * sizeof(struct gif_softc)); for (i = 0; i < ngif; sc++, i++) { sprintf(sc->gif_if.if_xname, "gif%d", i); sc->gif_if.if_mtu = GIF_MTU; sc->gif_if.if_flags = IFF_POINTOPOINT | IFF_MULTICAST; sc->gif_if.if_ioctl = gif_ioctl; sc->gif_if.if_output = gif_output; sc->gif_if.if_type = IFT_GIF; if_attach(&sc->gif_if); #if NBPFILTER > 0 bpfattach(&sc->gif_if.if_bpf, &sc->gif_if, DLT_NULL, sizeof(u_int)); #endif } } int gif_output(ifp, m, dst, rt) struct ifnet *ifp; struct mbuf *m; struct sockaddr *dst; struct rtentry *rt; /* added in net2 */ { register struct gif_softc *sc = (struct gif_softc*)ifp; int error = 0; static int called = 0; /* XXX: MUTEX */ int calllimit = 3; /* XXX: adhoc */ /* * gif may cause infinite recursion calls when misconfigured. * We'll prevent this by introducing upper limit. * XXX: this mechanism may introduce another problem about * mutual exclusion of the variable CALLED, especially if we * use kernel thread. */ if (++called >= calllimit) { log(LOG_NOTICE, "gif_output: recursively called too many times(%d)\n", called); m_freem(m); error = EIO; /* is there better errno? */ goto end; } ifp->if_lastchange = time; m->m_flags &= ~(M_BCAST|M_MCAST); if (!(ifp->if_flags & IFF_UP) || sc->gif_psrc == NULL || sc->gif_pdst == NULL) { m_freem(m); error = ENETDOWN; goto end; } #if NBPFILTER > 0 if (ifp->if_bpf) { /* * We need to prepend the address family as * a four byte field. Cons up a dummy header * to pacify bpf. This is safe because bpf * will only read from the mbuf (i.e., it won't * try to free it or keep a pointer a to it). */ struct mbuf m0; u_int af = dst->sa_family; m0.m_next = m; m0.m_len = 4; m0.m_data = (char *)⁡ bpf_mtap(ifp->if_bpf, &m0); } #endif ifp->if_opackets++; ifp->if_obytes += m->m_pkthdr.len; switch (sc->gif_psrc->sa_family) { #ifdef INET case AF_INET: error = in_gif_output(ifp, dst->sa_family, m, rt); break; #endif #ifdef INET6 case AF_INET6: error = in6_gif_output(ifp, dst->sa_family, m, rt); break; #endif default: m_freem(m); error = ENETDOWN; } end: called = 0; /* reset recursion counter */ if (error) ifp->if_oerrors++; return error; } int gif_ioctl(ifp, cmd, data) struct ifnet *ifp; u_long cmd; caddr_t data; { struct gif_softc *sc = (struct gif_softc*)ifp; struct ifreq *ifr = (struct ifreq*)data; int error = 0, size; struct sockaddr *sa, *dst, *src; switch (cmd) { case SIOCSIFADDR: break; case SIOCSIFDSTADDR: break; case SIOCADDMULTI: case SIOCDELMULTI: switch (ifr->ifr_addr.sa_family) { #ifdef INET case AF_INET: /* IP supports Multicast */ break; #endif /* INET */ #ifdef INET6 case AF_INET6: /* IP6 supports Multicast */ break; #endif /* INET6 */ default: /* Other protocols doesn't support Multicast */ error = EAFNOSUPPORT; break; } break; case SIOCSIFPHYADDR: #ifdef INET6 case SIOCSIFPHYADDR_IN6: #endif /* INET6 */ switch (ifr->ifr_addr.sa_family) { #ifdef INET case AF_INET: src = (struct sockaddr *) &(((struct in_aliasreq *)data)->ifra_addr); dst = (struct sockaddr *) &(((struct in_aliasreq *)data)->ifra_dstaddr); /* only one gif can have dst = INADDR_ANY */ #define satosaddr(sa) (((struct sockaddr_in *)(sa))->sin_addr.s_addr) if (satosaddr(dst) == INADDR_ANY) { int i; struct gif_softc *sc2; for (i = 0, sc2 = gif; i < ngif; i++, sc2++) { if (sc2 == sc) continue; if (sc2->gif_pdst && satosaddr(sc2->gif_pdst) == INADDR_ANY) { error = EADDRNOTAVAIL; goto bad; } } } size = sizeof(struct sockaddr_in); break; #endif /* INET */ #ifdef INET6 case AF_INET6: src = (struct sockaddr *) &(((struct in6_aliasreq *)data)->ifra_addr); dst = (struct sockaddr *) &(((struct in6_aliasreq *)data)->ifra_dstaddr); /* only one gif can have dst = in6addr_any */ #define satoin6(sa) (&((struct sockaddr_in6 *)(sa))->sin6_addr) if (IN6_IS_ADDR_UNSPECIFIED(satoin6(dst))) { int i; struct gif_softc *sc2; for (i = 0, sc2 = gif; i < ngif; i++, sc2++) { if (sc2 == sc) continue; if (sc2->gif_pdst && IN6_IS_ADDR_UNSPECIFIED( satoin6(sc2->gif_pdst) )) { error = EADDRNOTAVAIL; goto bad; } } } size = sizeof(struct sockaddr_in6); break; #endif /* INET6 */ default: error = EPROTOTYPE; goto bad; break; } if (sc->gif_psrc != NULL) free((caddr_t)sc->gif_psrc, M_IFADDR); if (sc->gif_pdst != NULL) free((caddr_t)sc->gif_pdst, M_IFADDR); sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); bzero((caddr_t)sa, size); bcopy((caddr_t)src, (caddr_t)sa, size); sc->gif_psrc = sa; sa = (struct sockaddr *)malloc(size, M_IFADDR, M_WAITOK); bzero((caddr_t)sa, size); bcopy((caddr_t)dst, (caddr_t)sa, size); sc->gif_pdst = sa; ifp->if_flags |= IFF_UP; if_up(ifp); /* send up RTM_IFINFO */ break; case SIOCGIFPSRCADDR: #ifdef INET6 case SIOCGIFPSRCADDR_IN6: #endif /* INET6 */ if (sc->gif_psrc == NULL) { error = EADDRNOTAVAIL; goto bad; } src = sc->gif_psrc; switch (sc->gif_psrc->sa_family) { #ifdef INET case AF_INET: dst = &ifr->ifr_addr; size = sizeof(struct sockaddr_in); break; #endif /* INET */ #ifdef INET6 case AF_INET6: dst = (struct sockaddr *) &(((struct in6_ifreq *)data)->ifr_addr); size = sizeof(struct sockaddr_in6); break; #endif /* INET6 */ default: error = EADDRNOTAVAIL; goto bad; } bcopy((caddr_t)src, (caddr_t)dst, size); break; case SIOCGIFPDSTADDR: #ifdef INET6 case SIOCGIFPDSTADDR_IN6: #endif /* INET6 */ if (sc->gif_pdst == NULL) { error = EADDRNOTAVAIL; goto bad; } src = sc->gif_pdst; switch (sc->gif_pdst->sa_family) { #ifdef INET case AF_INET: dst = &ifr->ifr_addr; size = sizeof(struct sockaddr_in); break; #endif /* INET */ #ifdef INET6 case AF_INET6: dst = (struct sockaddr *) &(((struct in6_ifreq *)data)->ifr_addr); size = sizeof(struct sockaddr_in6); break; #endif /* INET6 */ default: error = EADDRNOTAVAIL; goto bad; } bcopy((caddr_t)src, (caddr_t)dst, size); break; case SIOCSIFFLAGS: break; default: error = EINVAL; break; } bad: return error; } #endif /*NGIF > 0*/