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1/* $NetBSD: ip_gre.c,v 1.21 2002/08/14 00:23:30 itojun Exp $ */
2/* $FreeBSD: head/sys/netinet/ip_gre.c 123922 2003-12-28 03:56:00Z sam $ */
1/* $NetBSD: ip_gre.c,v 1.29 2003/09/05 23:02:43 itojun Exp $ */
2/* $FreeBSD: head/sys/netinet/ip_gre.c 123992 2003-12-30 11:41:43Z sobomax $ */
3
4/*
5 * Copyright (c) 1998 The NetBSD Foundation, Inc.
6 * All rights reserved.
7 *
8 * This code is derived from software contributed to The NetBSD Foundation
9 * by Heiko W.Rupp <hwr@pilhuhn.de>
10 *

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100 * IPPROTO_GRE and a local destination address).
101 * This really is simple
102 */
103void
104#if __STDC__
105gre_input(struct mbuf *m, ...)
106#else
107gre_input(m, va_alist)
108 struct mbuf *m;
109 va_dcl
108 struct mbuf *m;
109 va_dcl
110#endif
111{
112 int off, ret, proto;
113 va_list ap;
114
115 va_start(ap, m);
116 off = va_arg(ap, int);
117 va_end(ap);

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130/*
131 * decapsulate.
132 * Does the real work and is called from gre_input() (above)
133 * returns 0 if packet is not yet processed
134 * and 1 if it needs no further processing
135 * proto is the protocol number of the "calling" foo_input()
136 * routine.
137 */
138
138static int
139gre_input2(struct mbuf *m ,int hlen, u_char proto)
140{
142 struct greip *gip = mtod(m, struct greip *);
141 struct greip *gip;
142 int isr;
143 struct gre_softc *sc;
145 u_short flags;
144 u_int16_t flags;
145
146 if ((sc = gre_lookup(m, proto)) == NULL) {
147 /* No matching tunnel or tunnel is down. */
148 return (0);
149 }
150
151 if (m->m_len < sizeof(*gip)) {
152 m = m_pullup(m, sizeof(*gip));
153 if (m == NULL)
154 return (ENOBUFS);
155 }
156 gip = mtod(m, struct greip *);
157
158 sc->sc_if.if_ipackets++;
159 sc->sc_if.if_ibytes += m->m_pkthdr.len;
160
161 switch (proto) {
162 case IPPROTO_GRE:
157 hlen += sizeof (struct gre_h);
163 hlen += sizeof(struct gre_h);
164
165 /* process GRE flags as packet can be of variable len */
166 flags = ntohs(gip->gi_flags);
167
168 /* Checksum & Offset are present */
169 if ((flags & GRE_CP) | (flags & GRE_RP))
170 hlen += 4;
171 /* We don't support routing fields (variable length) */
172 if (flags & GRE_RP)
167 return(0);
173 return (0);
174 if (flags & GRE_KP)
175 hlen += 4;
176 if (flags & GRE_SP)
171 hlen +=4;
177 hlen += 4;
178
179 switch (ntohs(gip->gi_ptype)) { /* ethertypes */
180 case ETHERTYPE_IP: /* shouldn't need a schednetisr(), as */
181 case WCCP_PROTOCOL_TYPE: /* we are in ip_input */
182 isr = NETISR_IP;
183 break;
184#ifdef NETATALK
185 case ETHERTYPE_ATALK:
186 isr = NETISR_ATALK1;
187 break;
188#endif
189 case ETHERTYPE_IPV6:
190 /* FALLTHROUGH */
191 default: /* others not yet supported */
186 return(0);
192 return (0);
193 }
194 break;
195 default:
196 /* others not yet supported */
191 return(0);
197 return (0);
198 }
199
194 m->m_data += hlen;
195 m->m_len -= hlen;
200 if (hlen > m->m_pkthdr.len) {
201 m_freem(m);
202 return (EINVAL);
203 }
204 m_adj(m, hlen);
205 m->m_pkthdr.len -= hlen;
206
207 if (sc->sc_if.if_bpf) {
208 u_int32_t af = AF_INET;
209 bpf_mtap2(sc->sc_if.if_bpf, &af, sizeof(af), m);
210 }
211
212 m->m_pkthdr.rcvif = &sc->sc_if;
213
214 netisr_dispatch(isr, m);
215
207 return(1); /* packet is done, no further processing needed */
216 return (1); /* packet is done, no further processing needed */
217}
218
219/*
220 * input routine for IPPRPOTO_MOBILE
221 * This is a little bit diffrent from the other modes, as the
222 * encapsulating header was not prepended, but instead inserted
223 * between IP header and payload
224 */
225
226void
227#if __STDC__
228gre_mobile_input(struct mbuf *m, ...)
229#else
230gre_mobile_input(m, va_alist)
231 struct mbuf *m;
232 va_dcl
233#endif
234{
226 struct ip *ip = mtod(m, struct ip *);
227 struct mobip_h *mip = mtod(m, struct mobip_h *);
235 struct ip *ip;
236 struct mobip_h *mip;
237 struct gre_softc *sc;
238 int hlen;
239 va_list ap;
231 u_char osrc = 0;
240 int msiz;
241
234 va_start(ap,m);
242 va_start(ap, m);
243 hlen = va_arg(ap, int);
244 va_end(ap);
245
246 if ((sc = gre_lookup(m, IPPROTO_MOBILE)) == NULL) {
247 /* No matching tunnel or tunnel is down. */
248 m_freem(m);
249 return;
250 }
251
252 if (m->m_len < sizeof(*mip)) {
253 m = m_pullup(m, sizeof(*mip));
254 if (m == NULL)
255 return;
256 }
257 ip = mtod(m, struct ip *);
258 mip = mtod(m, struct mobip_h *);
259
260 sc->sc_if.if_ipackets++;
261 sc->sc_if.if_ibytes += m->m_pkthdr.len;
262
247 if(ntohs(mip->mh.proto) & MOB_H_SBIT) {
248 osrc = 1;
263 if (ntohs(mip->mh.proto) & MOB_H_SBIT) {
264 msiz = MOB_H_SIZ_L;
265 mip->mi.ip_src.s_addr = mip->mh.osrc;
251 } else {
266 } else
267 msiz = MOB_H_SIZ_S;
268
269 if (m->m_len < (ip->ip_hl << 2) + msiz) {
270 m = m_pullup(m, (ip->ip_hl << 2) + msiz);
271 if (m == NULL)
272 return;
273 ip = mtod(m, struct ip *);
274 mip = mtod(m, struct mobip_h *);
275 }
276
277 mip->mi.ip_dst.s_addr = mip->mh.odst;
278 mip->mi.ip_p = (ntohs(mip->mh.proto) >> 8);
279
257 if (gre_in_cksum((u_short*)&mip->mh,msiz) != 0) {
280 if (gre_in_cksum((u_int16_t *)&mip->mh, msiz) != 0) {
281 m_freem(m);
282 return;
283 }
284
285 bcopy((caddr_t)(ip) + (ip->ip_hl << 2) + msiz, (caddr_t)(ip) +
286 (ip->ip_hl << 2), m->m_len - msiz - (ip->ip_hl << 2));
287 m->m_len -= msiz;
288 m->m_pkthdr.len -= msiz;

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