kernel/netinet: Remove some unused variables.
[dragonfly.git] / sys / netinet / ip_gre.c
CommitLineData
984263bc 1/*
f23061d4 2 * $NetBSD: ip_gre.c,v 1.21 2002/08/14 00:23:30 itojun Exp $
f15db79e 3 *
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4 * Copyright (c) 1998 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Heiko W.Rupp <hwr@pilhuhn.de>
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
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20 * This product includes software developed by the NetBSD
21 * Foundation, Inc. and its contributors.
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22 * 4. Neither the name of The NetBSD Foundation nor the names of its
23 * contributors may be used to endorse or promote products derived
24 * from this software without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36 * POSSIBILITY OF SUCH DAMAGE.
37 */
38
39/*
40 * deencapsulate tunneled packets and send them on
41 * output half is in net/if_gre.[ch]
42 * This currently handles IPPROTO_GRE, IPPROTO_MOBILE
43 */
44
45#include "opt_inet.h"
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46
47#include <sys/param.h>
48#include <sys/systm.h>
49#include <sys/mbuf.h>
50#include <sys/socket.h>
51#include <sys/socketvar.h>
52#include <sys/protosw.h>
53#include <sys/errno.h>
54#include <sys/time.h>
55#include <sys/kernel.h>
56#include <sys/syslog.h>
3f9db7f8 57#include <sys/in_cksum.h>
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58#include <net/bpf.h>
59#include <net/ethernet.h>
60#include <net/if.h>
61#include <net/netisr.h>
62#include <net/route.h>
63#include <net/raw_cb.h>
64
65#ifdef INET
66#include <netinet/in.h>
67#include <netinet/in_var.h>
68#include <netinet/in_systm.h>
69#include <netinet/ip.h>
70#include <netinet/ip_var.h>
71#include <netinet/ip_gre.h>
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72#else
73#error ip_gre input without IP?
74#endif
75
984263bc 76/* Needs IP headers. */
d2438d69 77#include <net/gre/if_gre.h>
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78
79#include <machine/stdarg.h>
80
81#if 1
f23061d4 82void gre_inet_ntoa(struct in_addr in); /* XXX */
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83#endif
84
85static struct gre_softc *gre_lookup(struct mbuf *, u_int8_t);
86
87static int gre_input2(struct mbuf *, int, u_char);
88
89/*
90 * De-encapsulate a packet and feed it back through ip input (this
91 * routine is called whenever IP gets a packet with proto type
92 * IPPROTO_GRE and a local destination address).
93 * This really is simple
94 */
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95int
96gre_input(struct mbuf **mp, int *offp, int proto)
984263bc 97{
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98 struct mbuf *m;
99 int ret, off;
a00138cb 100
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101 off = *offp;
102 m = *mp;
103 *mp = NULL;
984263bc 104
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105 proto = (mtod(m, struct ip *))->ip_p;
106
107 ret = gre_input2(m, off, proto);
108 /*
f23061d4 109 * ret == 0 : packet not processed, meaning that
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110 * no matching tunnel that is up is found.
111 * we inject it to raw ip socket to see if anyone picks it up.
112 */
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113 if (ret == 0) {
114 *mp = m;
115 rip_input(mp, offp, proto);
116 }
117 return(IPPROTO_DONE);
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118}
119
120/*
121 * decapsulate.
122 * Does the real work and is called from gre_input() (above)
123 * returns 0 if packet is not yet processed
124 * and 1 if it needs no further processing
125 * proto is the protocol number of the "calling" foo_input()
126 * routine.
127 */
128
129static int
130gre_input2(struct mbuf *m ,int hlen, u_char proto)
131{
1f8e62c9 132 static const uint32_t af = AF_INET;
984263bc 133 struct greip *gip = mtod(m, struct greip *);
8bde602d 134 int isr;
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135 struct gre_softc *sc;
136 u_short flags;
137
138 if ((sc = gre_lookup(m, proto)) == NULL) {
139 /* No matching tunnel or tunnel is down. */
140 return (0);
141 }
142
143 sc->sc_if.if_ipackets++;
144 sc->sc_if.if_ibytes += m->m_pkthdr.len;
145
146 switch (proto) {
147 case IPPROTO_GRE:
148 hlen += sizeof (struct gre_h);
149
150 /* process GRE flags as packet can be of variable len */
151 flags = ntohs(gip->gi_flags);
152
153 /* Checksum & Offset are present */
154 if ((flags & GRE_CP) | (flags & GRE_RP))
155 hlen += 4;
156 /* We don't support routing fields (variable length) */
157 if (flags & GRE_RP)
158 return(0);
159 if (flags & GRE_KP)
160 hlen += 4;
161 if (flags & GRE_SP)
162 hlen +=4;
163
164 switch (ntohs(gip->gi_ptype)) { /* ethertypes */
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165 case ETHERTYPE_IP:
166 case WCCP_PROTOCOL_TYPE:
167 isr = NETISR_IP;
984263bc 168 break;
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169 case ETHERTYPE_IPV6:
170 /* FALLTHROUGH */
171 default: /* others not yet supported */
172 return(0);
173 }
174 break;
175 default:
176 /* others not yet supported */
177 return(0);
178 }
179
180 m->m_data += hlen;
181 m->m_len -= hlen;
182 m->m_pkthdr.len -= hlen;
183
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184 if (sc->sc_if.if_bpf) {
185 bpf_gettoken();
186 if (sc->sc_if.if_bpf)
187 bpf_ptap(sc->sc_if.if_bpf, m, &af, sizeof(af));
188 bpf_reltoken();
189 }
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190
191 m->m_pkthdr.rcvif = &sc->sc_if;
c3c96e44 192 netisr_queue(isr, m);
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193 return(1); /* packet is done, no further processing needed */
194}
195
196/*
197 * input routine for IPPRPOTO_MOBILE
198 * This is a little bit diffrent from the other modes, as the
199 * encapsulating header was not prepended, but instead inserted
200 * between IP header and payload
201 */
202
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203int
204gre_mobile_input(struct mbuf **mp, int *offp, int proto)
984263bc 205{
1f8e62c9 206 static const uint32_t af = AF_INET;
002c1265 207 struct mbuf *m = *mp;
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208 struct ip *ip = mtod(m, struct ip *);
209 struct mobip_h *mip = mtod(m, struct mobip_h *);
984263bc 210 struct gre_softc *sc;
633abfbf 211 int msiz;
984263bc 212
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213 if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
214 /* No matching tunnel or tunnel is down. */
215 m_freem(m);
002c1265 216 return(IPPROTO_DONE);
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217 }
218
219 sc->sc_if.if_ipackets++;
220 sc->sc_if.if_ibytes += m->m_pkthdr.len;
221
222 if(ntohs(mip->mh.proto) & MOB_H_SBIT) {
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223 msiz = MOB_H_SIZ_L;
224 mip->mi.ip_src.s_addr = mip->mh.osrc;
225 } else {
226 msiz = MOB_H_SIZ_S;
227 }
228 mip->mi.ip_dst.s_addr = mip->mh.odst;
229 mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
230
231 if (gre_in_cksum((u_short*)&mip->mh,msiz) != 0) {
232 m_freem(m);
002c1265 233 return(IPPROTO_DONE);
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234 }
235
236 bcopy((caddr_t)(ip) + (ip->ip_hl << 2) + msiz, (caddr_t)(ip) +
237 (ip->ip_hl << 2), m->m_len - msiz - (ip->ip_hl << 2));
238 m->m_len -= msiz;
239 m->m_pkthdr.len -= msiz;
240
241 /*
242 * On FreeBSD, rip_input() supplies us with ip->ip_len
243 * already converted into host byteorder and also decreases
244 * it by the lengh of IP header, however, ip_input() expects
245 * that this field is in the original format (network byteorder
246 * and full size of IP packet), so that adjust accordingly.
247 */
248 ip->ip_len = htons(ip->ip_len + sizeof(struct ip) - msiz);
249
250 ip->ip_sum = 0;
251 ip->ip_sum = in_cksum(m, (ip->ip_hl << 2));
252
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253 if (sc->sc_if.if_bpf) {
254 bpf_gettoken();
255 if (sc->sc_if.if_bpf)
256 bpf_ptap(sc->sc_if.if_bpf, m, &af, sizeof(af));
257 bpf_reltoken();
258 }
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259
260 m->m_pkthdr.rcvif = &sc->sc_if;
261
c3c96e44 262 netisr_queue(NETISR_IP, m);
002c1265 263 return(IPPROTO_DONE);
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264}
265
266/*
267 * Find the gre interface associated with our src/dst/proto set.
268 */
269static struct gre_softc *
f3f70f0d 270gre_lookup(struct mbuf *m, u_int8_t proto)
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271{
272 struct ip *ip = mtod(m, struct ip *);
273 struct gre_softc *sc;
274
275 for (sc = LIST_FIRST(&gre_softc_list); sc != NULL;
276 sc = LIST_NEXT(sc, sc_list)) {
277 if ((sc->g_dst.s_addr == ip->ip_src.s_addr) &&
278 (sc->g_src.s_addr == ip->ip_dst.s_addr) &&
279 (sc->g_proto == proto) &&
280 ((sc->sc_if.if_flags & IFF_UP) != 0))
281 return (sc);
282 }
283
284 return (NULL);
285}