Annotation of sys/netinet/in_gif.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: in_gif.c,v 1.33 2007/02/15 22:40:02 claudio Exp $ */
! 2: /* $KAME: in_gif.c,v 1.50 2001/01/22 07:27:16 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/mbuf.h>
! 37:
! 38: #include <net/if.h>
! 39: #include <net/route.h>
! 40: #include <net/if_gif.h>
! 41:
! 42: #include <netinet/in.h>
! 43: #include <netinet/in_systm.h>
! 44: #include <netinet/ip.h>
! 45: #include <netinet/ip_var.h>
! 46: #include <netinet/in_gif.h>
! 47: #include <netinet/ip_ipsp.h>
! 48:
! 49: #ifdef INET6
! 50: #include <netinet/ip6.h>
! 51: #endif
! 52:
! 53: #include "gif.h"
! 54: #include "bridge.h"
! 55:
! 56: int
! 57: in_gif_output(ifp, family, m)
! 58: struct ifnet *ifp;
! 59: int family;
! 60: struct mbuf *m;
! 61: {
! 62: struct gif_softc *sc = (struct gif_softc*)ifp;
! 63: struct sockaddr_in *sin_src = (struct sockaddr_in *)sc->gif_psrc;
! 64: struct sockaddr_in *sin_dst = (struct sockaddr_in *)sc->gif_pdst;
! 65: struct tdb tdb;
! 66: struct xformsw xfs;
! 67: int error;
! 68: struct mbuf *mp;
! 69:
! 70: if (sin_src == NULL || sin_dst == NULL ||
! 71: sin_src->sin_family != AF_INET ||
! 72: sin_dst->sin_family != AF_INET) {
! 73: m_freem(m);
! 74: return EAFNOSUPPORT;
! 75: }
! 76:
! 77: /* setup dummy tdb. it highly depends on ipipoutput() code. */
! 78: bzero(&tdb, sizeof(tdb));
! 79: bzero(&xfs, sizeof(xfs));
! 80: tdb.tdb_src.sin.sin_family = AF_INET;
! 81: tdb.tdb_src.sin.sin_len = sizeof(struct sockaddr_in);
! 82: tdb.tdb_src.sin.sin_addr = sin_src->sin_addr;
! 83: tdb.tdb_dst.sin.sin_family = AF_INET;
! 84: tdb.tdb_dst.sin.sin_len = sizeof(struct sockaddr_in);
! 85: tdb.tdb_dst.sin.sin_addr = sin_dst->sin_addr;
! 86: tdb.tdb_xform = &xfs;
! 87: xfs.xf_type = -1; /* not XF_IP4 */
! 88:
! 89: switch (family) {
! 90: case AF_INET:
! 91: break;
! 92: #ifdef INET6
! 93: case AF_INET6:
! 94: break;
! 95: #endif
! 96: #if NBRIDGE > 0
! 97: case AF_LINK:
! 98: break;
! 99: #endif /* NBRIDGE */
! 100: default:
! 101: #ifdef DEBUG
! 102: printf("in_gif_output: warning: unknown family %d passed\n",
! 103: family);
! 104: #endif
! 105: m_freem(m);
! 106: return EAFNOSUPPORT;
! 107: }
! 108:
! 109: /* encapsulate into IPv4 packet */
! 110: mp = NULL;
! 111: #if NBRIDGE > 0
! 112: if (family == AF_LINK)
! 113: error = etherip_output(m, &tdb, &mp, 0, 0);
! 114: else
! 115: #endif /* NBRIDGE */
! 116: error = ipip_output(m, &tdb, &mp, 0, 0);
! 117: if (error)
! 118: return error;
! 119: else if (mp == NULL)
! 120: return EFAULT;
! 121:
! 122: m = mp;
! 123:
! 124: return ip_output(m, (void *)NULL, (void *)NULL, 0, (void *)NULL,
! 125: (void *)NULL);
! 126: }
! 127:
! 128: void
! 129: in_gif_input(struct mbuf *m, ...)
! 130: {
! 131: int off;
! 132: struct gif_softc *sc;
! 133: struct ifnet *gifp = NULL;
! 134: struct ip *ip;
! 135: va_list ap;
! 136:
! 137: va_start(ap, m);
! 138: off = va_arg(ap, int);
! 139: va_end(ap);
! 140:
! 141: /* IP-in-IP header is caused by tunnel mode, so skip gif lookup */
! 142: if (m->m_flags & M_TUNNEL) {
! 143: m->m_flags &= ~M_TUNNEL;
! 144: goto inject;
! 145: }
! 146:
! 147: ip = mtod(m, struct ip *);
! 148:
! 149: /* this code will be soon improved. */
! 150: #define satosin(sa) ((struct sockaddr_in *)(sa))
! 151: LIST_FOREACH(sc, &gif_softc_list, gif_list) {
! 152: if (sc->gif_psrc == NULL || sc->gif_pdst == NULL ||
! 153: sc->gif_psrc->sa_family != AF_INET ||
! 154: sc->gif_pdst->sa_family != AF_INET) {
! 155: continue;
! 156: }
! 157:
! 158: if ((sc->gif_if.if_flags & IFF_UP) == 0)
! 159: continue;
! 160:
! 161: if (in_hosteq(satosin(sc->gif_psrc)->sin_addr, ip->ip_dst) &&
! 162: in_hosteq(satosin(sc->gif_pdst)->sin_addr, ip->ip_src))
! 163: {
! 164: gifp = &sc->gif_if;
! 165: break;
! 166: }
! 167: }
! 168:
! 169: if (gifp) {
! 170: m->m_pkthdr.rcvif = gifp;
! 171: gifp->if_ipackets++;
! 172: gifp->if_ibytes += m->m_pkthdr.len;
! 173: ipip_input(m, off, gifp); /* We have a configured GIF */
! 174: return;
! 175: }
! 176:
! 177: inject:
! 178: ip4_input(m, off); /* No GIF interface was configured */
! 179: return;
! 180: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to in_gif.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / netinet