Annotation of sys/netinet/in_gif.c, Revision 1.1.1.1
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: }
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