Annotation of sys/netinet6/in6_gif.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: in6_gif.c,v 1.25 2007/06/01 00:52:38 henning Exp $ */
! 2: /* $KAME: in6_gif.c,v 1.43 2001/01/22 07:27:17 itojun Exp $ */
! 3:
! 4: /*
! 5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. Neither the name of the project nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: */
! 32:
! 33: #include <sys/param.h>
! 34: #include <sys/systm.h>
! 35: #include <sys/socket.h>
! 36: #include <sys/sockio.h>
! 37: #include <sys/mbuf.h>
! 38: #include <sys/errno.h>
! 39: #include <sys/ioctl.h>
! 40: #include <sys/protosw.h>
! 41:
! 42: #include <net/if.h>
! 43: #include <net/route.h>
! 44:
! 45: #include <netinet/in.h>
! 46: #include <netinet/in_systm.h>
! 47: #include <netinet/ip_ipsp.h>
! 48:
! 49: #ifdef INET
! 50: #include <netinet/ip.h>
! 51: #endif
! 52:
! 53: #include <netinet/ip6.h>
! 54: #include <netinet6/ip6_var.h>
! 55: #include <netinet6/in6_gif.h>
! 56:
! 57: #ifdef INET6
! 58: #include <netinet/ip6.h>
! 59: #endif
! 60:
! 61: #include <netinet/ip_ecn.h>
! 62:
! 63: #include <net/if_gif.h>
! 64:
! 65: #include "bridge.h"
! 66:
! 67: #ifndef offsetof
! 68: #define offsetof(s, e) ((int)&((s *)0)->e)
! 69: #endif
! 70:
! 71: int
! 72: in6_gif_output(ifp, family, m)
! 73: struct ifnet *ifp;
! 74: int family; /* family of the packet to be encapsulate. */
! 75: struct mbuf *m;
! 76: {
! 77: struct gif_softc *sc = (struct gif_softc*)ifp;
! 78: struct sockaddr_in6 *dst = (struct sockaddr_in6 *)&sc->gif_ro6.ro_dst;
! 79: struct sockaddr_in6 *sin6_src = (struct sockaddr_in6 *)sc->gif_psrc;
! 80: struct sockaddr_in6 *sin6_dst = (struct sockaddr_in6 *)sc->gif_pdst;
! 81: struct tdb tdb;
! 82: struct xformsw xfs;
! 83: int error;
! 84: struct mbuf *mp;
! 85:
! 86: if (sin6_src == NULL || sin6_dst == NULL ||
! 87: sin6_src->sin6_family != AF_INET6 ||
! 88: sin6_dst->sin6_family != AF_INET6) {
! 89: m_freem(m);
! 90: return EAFNOSUPPORT;
! 91: }
! 92:
! 93: /* setup dummy tdb. it highly depends on ipip_output() code. */
! 94: bzero(&tdb, sizeof(tdb));
! 95: bzero(&xfs, sizeof(xfs));
! 96: tdb.tdb_src.sin6.sin6_family = AF_INET6;
! 97: tdb.tdb_src.sin6.sin6_len = sizeof(struct sockaddr_in6);
! 98: tdb.tdb_src.sin6.sin6_addr = sin6_src->sin6_addr;
! 99: tdb.tdb_dst.sin6.sin6_family = AF_INET6;
! 100: tdb.tdb_dst.sin6.sin6_len = sizeof(struct sockaddr_in6);
! 101: tdb.tdb_dst.sin6.sin6_addr = sin6_dst->sin6_addr;
! 102: tdb.tdb_xform = &xfs;
! 103: xfs.xf_type = -1; /* not XF_IP4 */
! 104:
! 105: switch (family) {
! 106: #ifdef INET
! 107: case AF_INET:
! 108: break;
! 109: #endif
! 110: #ifdef INET6
! 111: case AF_INET6:
! 112: break;
! 113: #endif
! 114: #if NBRIDGE > 0
! 115: case AF_LINK:
! 116: break;
! 117: #endif /* NBRIDGE */
! 118: default:
! 119: #ifdef DEBUG
! 120: printf("in6_gif_output: warning: unknown family %d passed\n",
! 121: family);
! 122: #endif
! 123: m_freem(m);
! 124: return EAFNOSUPPORT;
! 125: }
! 126:
! 127: /* encapsulate into IPv6 packet */
! 128: mp = NULL;
! 129: #if NBRIDGE > 0
! 130: if (family == AF_LINK)
! 131: error = etherip_output(m, &tdb, &mp, 0, 0);
! 132: else
! 133: #endif /* NBRIDGE */
! 134: error = ipip_output(m, &tdb, &mp, 0, 0);
! 135: if (error)
! 136: return error;
! 137: else if (mp == NULL)
! 138: return EFAULT;
! 139:
! 140: m = mp;
! 141:
! 142: /* See if out cached route remains the same */
! 143: if (dst->sin6_family != sin6_dst->sin6_family ||
! 144: !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &sin6_dst->sin6_addr)) {
! 145: /* cache route doesn't match */
! 146: bzero(dst, sizeof(*dst));
! 147: dst->sin6_family = sin6_dst->sin6_family;
! 148: dst->sin6_len = sizeof(struct sockaddr_in6);
! 149: dst->sin6_addr = sin6_dst->sin6_addr;
! 150: if (sc->gif_ro6.ro_rt) {
! 151: RTFREE(sc->gif_ro6.ro_rt);
! 152: sc->gif_ro6.ro_rt = NULL;
! 153: }
! 154: }
! 155:
! 156: if (sc->gif_ro6.ro_rt == NULL) {
! 157: rtalloc((struct route *)&sc->gif_ro6);
! 158: if (sc->gif_ro6.ro_rt == NULL) {
! 159: m_freem(m);
! 160: return ENETUNREACH;
! 161: }
! 162: }
! 163:
! 164: /*
! 165: * force fragmentation to minimum MTU, to avoid path MTU discovery.
! 166: * it is too painful to ask for resend of inner packet, to achieve
! 167: * path MTU discovery for encapsulated packets.
! 168: */
! 169: error = ip6_output(m, 0, &sc->gif_ro6, IPV6_MINMTU, 0, NULL, NULL);
! 170:
! 171: return error;
! 172: }
! 173:
! 174: int in6_gif_input(mp, offp, proto)
! 175: struct mbuf **mp;
! 176: int *offp, proto;
! 177: {
! 178: struct mbuf *m = *mp;
! 179: struct gif_softc *sc;
! 180: struct ifnet *gifp = NULL;
! 181: struct ip6_hdr *ip6;
! 182:
! 183: /* XXX What if we run transport-mode IPsec to protect gif tunnel ? */
! 184: if (m->m_flags & (M_AUTH | M_CONF))
! 185: goto inject;
! 186:
! 187: ip6 = mtod(m, struct ip6_hdr *);
! 188:
! 189: #define satoin6(sa) (((struct sockaddr_in6 *)(sa))->sin6_addr)
! 190: LIST_FOREACH(sc, &gif_softc_list, gif_list) {
! 191: if (sc->gif_psrc == NULL || sc->gif_pdst == NULL ||
! 192: sc->gif_psrc->sa_family != AF_INET6 ||
! 193: sc->gif_pdst->sa_family != AF_INET6) {
! 194: continue;
! 195: }
! 196:
! 197: if ((sc->gif_if.if_flags & IFF_UP) == 0)
! 198: continue;
! 199:
! 200: if (IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_psrc), &ip6->ip6_dst) &&
! 201: IN6_ARE_ADDR_EQUAL(&satoin6(sc->gif_pdst), &ip6->ip6_src)) {
! 202: gifp = &sc->gif_if;
! 203: break;
! 204: }
! 205: }
! 206:
! 207: if (gifp) {
! 208: m->m_pkthdr.rcvif = gifp;
! 209: gifp->if_ipackets++;
! 210: gifp->if_ibytes += m->m_pkthdr.len;
! 211: ipip_input(m, *offp, gifp);
! 212: return IPPROTO_DONE;
! 213: }
! 214:
! 215: inject:
! 216: /* No GIF tunnel configured */
! 217: ip4_input6(&m, offp, 0); /* XXX last argument ignored */
! 218: return IPPROTO_DONE;
! 219: }
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