HAMMER 60I/Many: Mirroring
[dragonfly.git] / sys / netinet / ip_gre.c
blob4eba6de6706998cc4622663e580fe3d444026700
1 /*
2 * $NetBSD: ip_gre.c,v 1.21 2002/08/14 00:23:30 itojun Exp $
3 * $DragonFly: src/sys/netinet/ip_gre.c,v 1.10 2006/01/14 11:33:50 swildner Exp $
5 * Copyright (c) 1998 The NetBSD Foundation, Inc.
6 * All rights reserved.
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Heiko W.Rupp <hwr@pilhuhn.de>
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the NetBSD
22 * Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 * contributors may be used to endorse or promote products derived
25 * from this software without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
41 * deencapsulate tunneled packets and send them on
42 * output half is in net/if_gre.[ch]
43 * This currently handles IPPROTO_GRE, IPPROTO_MOBILE
46 #include "opt_inet.h"
47 #include "opt_ns.h"
48 #include "opt_atalk.h"
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/mbuf.h>
53 #include <sys/socket.h>
54 #include <sys/socketvar.h>
55 #include <sys/protosw.h>
56 #include <sys/errno.h>
57 #include <sys/time.h>
58 #include <sys/kernel.h>
59 #include <sys/syslog.h>
60 #include <sys/in_cksum.h>
61 #include <net/bpf.h>
62 #include <net/ethernet.h>
63 #include <net/if.h>
64 #include <net/netisr.h>
65 #include <net/route.h>
66 #include <net/raw_cb.h>
68 #ifdef INET
69 #include <netinet/in.h>
70 #include <netinet/in_var.h>
71 #include <netinet/in_systm.h>
72 #include <netinet/ip.h>
73 #include <netinet/ip_var.h>
74 #include <netinet/ip_gre.h>
75 #else
76 #error ip_gre input without IP?
77 #endif
79 #ifdef NS
80 #include <netproto/ns/ns.h>
81 #include <netproto/ns/ns_if.h>
82 #endif
84 #ifdef NETATALK
85 #include <netproto/atalk/at.h>
86 #include <netproto/atalk/at_var.h>
87 #include <netproto/atalk/at_extern.h>
88 #endif
90 /* Needs IP headers. */
91 #include <net/gre/if_gre.h>
93 #include <machine/stdarg.h>
95 #if 1
96 void gre_inet_ntoa(struct in_addr in); /* XXX */
97 #endif
99 static struct gre_softc *gre_lookup(struct mbuf *, u_int8_t);
101 static int gre_input2(struct mbuf *, int, u_char);
104 * De-encapsulate a packet and feed it back through ip input (this
105 * routine is called whenever IP gets a packet with proto type
106 * IPPROTO_GRE and a local destination address).
107 * This really is simple
109 void
110 gre_input(struct mbuf *m, ...)
112 int ret, off, proto;
113 __va_list ap;
115 __va_start(ap, m);
116 off = __va_arg(ap, int);
117 __va_end(ap);
119 proto = (mtod(m, struct ip *))->ip_p;
121 ret = gre_input2(m, off, proto);
123 * ret == 0 : packet not processed, meaning that
124 * no matching tunnel that is up is found.
125 * we inject it to raw ip socket to see if anyone picks it up.
127 if (ret == 0)
128 rip_input(m, off, proto);
132 * decapsulate.
133 * Does the real work and is called from gre_input() (above)
134 * returns 0 if packet is not yet processed
135 * and 1 if it needs no further processing
136 * proto is the protocol number of the "calling" foo_input()
137 * routine.
140 static int
141 gre_input2(struct mbuf *m ,int hlen, u_char proto)
143 static const uint32_t af = AF_INET;
144 struct greip *gip = mtod(m, struct greip *);
145 int isr;
146 struct gre_softc *sc;
147 u_short flags;
149 if ((sc = gre_lookup(m, proto)) == NULL) {
150 /* No matching tunnel or tunnel is down. */
151 return (0);
154 sc->sc_if.if_ipackets++;
155 sc->sc_if.if_ibytes += m->m_pkthdr.len;
157 switch (proto) {
158 case IPPROTO_GRE:
159 hlen += sizeof (struct gre_h);
161 /* process GRE flags as packet can be of variable len */
162 flags = ntohs(gip->gi_flags);
164 /* Checksum & Offset are present */
165 if ((flags & GRE_CP) | (flags & GRE_RP))
166 hlen += 4;
167 /* We don't support routing fields (variable length) */
168 if (flags & GRE_RP)
169 return(0);
170 if (flags & GRE_KP)
171 hlen += 4;
172 if (flags & GRE_SP)
173 hlen +=4;
175 switch (ntohs(gip->gi_ptype)) { /* ethertypes */
176 case ETHERTYPE_IP:
177 case WCCP_PROTOCOL_TYPE:
178 isr = NETISR_IP;
179 break;
180 #ifdef NS
181 case ETHERTYPE_NS:
182 isr = NETISR_NS;
183 break;
184 #endif
185 #ifdef NETATALK
186 case ETHERTYPE_ATALK:
187 isr = NETISR_ATALK1;
188 break;
189 #endif
190 case ETHERTYPE_IPV6:
191 /* FALLTHROUGH */
192 default: /* others not yet supported */
193 return(0);
195 break;
196 default:
197 /* others not yet supported */
198 return(0);
201 m->m_data += hlen;
202 m->m_len -= hlen;
203 m->m_pkthdr.len -= hlen;
205 if (sc->sc_if.if_bpf)
206 bpf_ptap(sc->sc_if.if_bpf, m, &af, sizeof(af));
208 m->m_pkthdr.rcvif = &sc->sc_if;
209 netisr_dispatch(isr, m);
210 return(1); /* packet is done, no further processing needed */
214 * input routine for IPPRPOTO_MOBILE
215 * This is a little bit diffrent from the other modes, as the
216 * encapsulating header was not prepended, but instead inserted
217 * between IP header and payload
220 void
221 gre_mobile_input(struct mbuf *m, ...)
223 static const uint32_t af = AF_INET;
224 struct ip *ip = mtod(m, struct ip *);
225 struct mobip_h *mip = mtod(m, struct mobip_h *);
226 struct gre_softc *sc;
227 u_char osrc = 0;
228 int msiz, hlen;
229 __va_list ap;
231 __va_start(ap, m);
232 hlen = __va_arg(ap, int);
233 __va_end(ap);
235 if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
236 /* No matching tunnel or tunnel is down. */
237 m_freem(m);
238 return;
241 sc->sc_if.if_ipackets++;
242 sc->sc_if.if_ibytes += m->m_pkthdr.len;
244 if(ntohs(mip->mh.proto) & MOB_H_SBIT) {
245 osrc = 1;
246 msiz = MOB_H_SIZ_L;
247 mip->mi.ip_src.s_addr = mip->mh.osrc;
248 } else {
249 msiz = MOB_H_SIZ_S;
251 mip->mi.ip_dst.s_addr = mip->mh.odst;
252 mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
254 if (gre_in_cksum((u_short*)&mip->mh,msiz) != 0) {
255 m_freem(m);
256 return;
259 bcopy((caddr_t)(ip) + (ip->ip_hl << 2) + msiz, (caddr_t)(ip) +
260 (ip->ip_hl << 2), m->m_len - msiz - (ip->ip_hl << 2));
261 m->m_len -= msiz;
262 m->m_pkthdr.len -= msiz;
265 * On FreeBSD, rip_input() supplies us with ip->ip_len
266 * already converted into host byteorder and also decreases
267 * it by the lengh of IP header, however, ip_input() expects
268 * that this field is in the original format (network byteorder
269 * and full size of IP packet), so that adjust accordingly.
271 ip->ip_len = htons(ip->ip_len + sizeof(struct ip) - msiz);
273 ip->ip_sum = 0;
274 ip->ip_sum = in_cksum(m, (ip->ip_hl << 2));
276 if (sc->sc_if.if_bpf)
277 bpf_ptap(sc->sc_if.if_bpf, m, &af, sizeof(af));
279 m->m_pkthdr.rcvif = &sc->sc_if;
281 netisr_dispatch(NETISR_IP, m);
285 * Find the gre interface associated with our src/dst/proto set.
287 static struct gre_softc *
288 gre_lookup(struct mbuf *m, u_int8_t proto)
290 struct ip *ip = mtod(m, struct ip *);
291 struct gre_softc *sc;
293 for (sc = LIST_FIRST(&gre_softc_list); sc != NULL;
294 sc = LIST_NEXT(sc, sc_list)) {
295 if ((sc->g_dst.s_addr == ip->ip_src.s_addr) &&
296 (sc->g_src.s_addr == ip->ip_dst.s_addr) &&
297 (sc->g_proto == proto) &&
298 ((sc->sc_if.if_flags & IFF_UP) != 0))
299 return (sc);
302 return (NULL);