FreeBSD/Linux Kernel Cross Reference
sys/netipx/ipx_ip.c
1 /*-
2 * Copyright (c) 1995, Mike Mitchell
3 * Copyright (c) 1984, 1985, 1986, 1987, 1993
4 * The Regents of the University of California. All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. All advertising materials mentioning features or use of this software
15 * must display the following acknowledgement:
16 * This product includes software developed by the University of
17 * California, Berkeley and its contributors.
18 * 4. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * @(#)ipx_ip.c
35 */
36
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD: src/sys/netipx/ipx_ip.c,v 1.36.4.3 2005/02/25 13:26:39 rwatson Exp $");
39
40 /*
41 * Software interface driver for encapsulating IPX in IP.
42 */
43
44 #include "opt_inet.h"
45 #include "opt_ipx.h"
46
47 #ifdef IPXIP
48 #ifndef INET
49 #error The option IPXIP requires option INET.
50 #endif
51
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/malloc.h>
55 #include <sys/mbuf.h>
56 #include <sys/protosw.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
59 #include <sys/sockio.h>
60
61 #include <net/if.h>
62 #include <net/netisr.h>
63 #include <net/route.h>
64
65 #include <netinet/in.h>
66 #include <netinet/in_systm.h>
67 #include <netinet/in_var.h>
68 #include <netinet/ip.h>
69 #include <netinet/ip_var.h>
70
71 #include <netipx/ipx.h>
72 #include <netipx/ipx_if.h>
73 #include <netipx/ipx_ip.h>
74 #include <netipx/ipx_var.h>
75
76 static struct ifnet ipxipif;
77 static int ipxipif_units;
78
79 /* list of all hosts and gateways or broadcast addrs */
80 static struct ifnet_en *ipxip_list;
81
82 static struct ifnet_en *ipxipattach(void);
83 static int ipxip_free(struct ifnet *ifp);
84 static int ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
85 static int ipxipoutput(struct ifnet *ifp, struct mbuf *m,
86 struct sockaddr *dst, struct rtentry *rt);
87 static void ipxip_rtchange(struct in_addr *dst);
88 static void ipxipstart(struct ifnet *ifp);
89
90 static struct ifnet_en *
91 ipxipattach()
92 {
93 register struct ifnet_en *m;
94 register struct ifnet *ifp;
95
96 if (ipxipif.if_mtu == 0) {
97 ifp = &ipxipif;
98 if_initname(ifp, "ipxip", ipxipif_units);
99 ifp->if_mtu = LOMTU;
100 ifp->if_ioctl = ipxipioctl;
101 ifp->if_output = ipxipoutput;
102 ifp->if_start = ipxipstart;
103 ifp->if_flags = IFF_POINTOPOINT;
104 }
105
106 MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT | M_ZERO);
107 if (m == NULL)
108 return (NULL);
109 m->ifen_next = ipxip_list;
110 ipxip_list = m;
111 ifp = &m->ifen_ifnet;
112
113 if_initname(ifp, "ipxip", ipxipif_units++);
114 ifp->if_mtu = LOMTU;
115 ifp->if_ioctl = ipxipioctl;
116 ifp->if_output = ipxipoutput;
117 ifp->if_start = ipxipstart;
118 ifp->if_flags = IFF_POINTOPOINT;
119 if_attach(ifp);
120
121 return (m);
122 }
123
124
125 /*
126 * Process an ioctl request.
127 */
128 static int
129 ipxipioctl(ifp, cmd, data)
130 register struct ifnet *ifp;
131 u_long cmd;
132 caddr_t data;
133 {
134 int error = 0;
135 struct ifreq *ifr;
136
137 switch (cmd) {
138
139 case SIOCSIFADDR:
140 ifp->if_flags |= IFF_UP;
141 /* FALLTHROUGH */
142
143 case SIOCSIFDSTADDR:
144 /*
145 * Everything else is done at a higher level.
146 */
147 break;
148
149 case SIOCSIFFLAGS:
150 ifr = (struct ifreq *)data;
151 if ((ifr->ifr_flags & IFF_UP) == 0)
152 error = ipxip_free(ifp);
153
154
155 default:
156 error = EINVAL;
157 }
158 return (error);
159 }
160
161 static struct mbuf *ipxip_badlen;
162 static struct mbuf *ipxip_lastin;
163 static int ipxip_hold_input;
164
165 void
166 ipxip_input(m, hlen)
167 register struct mbuf *m;
168 int hlen;
169 {
170 register struct ip *ip;
171 register struct ipx *ipx;
172 int len, s;
173
174 if (ipxip_hold_input) {
175 if (ipxip_lastin != NULL) {
176 m_freem(ipxip_lastin);
177 }
178 ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
179 }
180 /*
181 * Get IP and IPX header together in first mbuf.
182 */
183 ipxipif.if_ipackets++;
184 s = sizeof(struct ip) + sizeof(struct ipx);
185 if (((m->m_flags & M_EXT) || m->m_len < s) &&
186 (m = m_pullup(m, s)) == NULL) {
187 ipxipif.if_ierrors++;
188 return;
189 }
190 ip = mtod(m, struct ip *);
191 if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
192 ip_stripoptions(m, (struct mbuf *)NULL);
193 if (m->m_len < s) {
194 if ((m = m_pullup(m, s)) == NULL) {
195 ipxipif.if_ierrors++;
196 return;
197 }
198 ip = mtod(m, struct ip *);
199 }
200 }
201
202 /*
203 * Make mbuf data length reflect IPX length.
204 * If not enough data to reflect IPX length, drop.
205 */
206 m->m_data += sizeof(struct ip);
207 m->m_len -= sizeof(struct ip);
208 m->m_pkthdr.len -= sizeof(struct ip);
209 ipx = mtod(m, struct ipx *);
210 len = ntohs(ipx->ipx_len);
211 if (len & 1)
212 len++; /* Preserve Garbage Byte */
213 if (ip->ip_len != len) {
214 if (len > ip->ip_len) {
215 ipxipif.if_ierrors++;
216 if (ipxip_badlen)
217 m_freem(ipxip_badlen);
218 ipxip_badlen = m;
219 return;
220 }
221 /* Any extra will be trimmed off by the IPX routines */
222 }
223
224 /*
225 * Deliver to IPX
226 */
227 netisr_dispatch(NETISR_IPX, m);
228 }
229
230 static int
231 ipxipoutput(ifp, m, dst, rt)
232 struct ifnet *ifp;
233 struct mbuf *m;
234 struct sockaddr *dst;
235 struct rtentry *rt;
236 {
237 register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
238 register struct ip *ip;
239 register struct route *ro = &(ifn->ifen_route);
240 register int len = 0;
241 register struct ipx *ipx = mtod(m, struct ipx *);
242 int error;
243
244 ifn->ifen_ifnet.if_opackets++;
245 ipxipif.if_opackets++;
246
247 /*
248 * Calculate data length and make space
249 * for IP header.
250 */
251 len = ntohs(ipx->ipx_len);
252 if (len & 1)
253 len++; /* Preserve Garbage Byte */
254 /* following clause not necessary on vax */
255 if (3 & (intptr_t)m->m_data) {
256 /* force longword alignment of ip hdr */
257 struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
258 if (m0 == NULL) {
259 m_freem(m);
260 return (ENOBUFS);
261 }
262 MH_ALIGN(m0, sizeof(struct ip));
263 m0->m_flags = m->m_flags & M_COPYFLAGS;
264 m0->m_next = m;
265 m0->m_len = sizeof(struct ip);
266 m0->m_pkthdr.len = m0->m_len + m->m_len;
267 m->m_flags &= ~M_PKTHDR;
268 m = m0;
269 } else {
270 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
271 if (m == NULL)
272 return (ENOBUFS);
273 }
274 /*
275 * Fill in IP header.
276 */
277 ip = mtod(m, struct ip *);
278 *(long *)ip = 0;
279 ip->ip_p = IPPROTO_IDP;
280 ip->ip_src = ifn->ifen_src;
281 ip->ip_dst = ifn->ifen_dst;
282 ip->ip_len = (u_short)len + sizeof(struct ip);
283 ip->ip_ttl = MAXTTL;
284
285 /*
286 * Output final datagram.
287 */
288 error = (ip_output(m, (struct mbuf *)NULL, ro, SO_BROADCAST, NULL, NULL));
289 if (error) {
290 ifn->ifen_ifnet.if_oerrors++;
291 ifn->ifen_ifnet.if_ierrors = error;
292 }
293 return (error);
294 m_freem(m);
295 return (ENETUNREACH);
296 }
297
298 static void
299 ipxipstart(ifp)
300 struct ifnet *ifp;
301 {
302 panic("ipxip_start called\n");
303 }
304
305 static struct ifreq ifr_ipxip = {"ipxip0"};
306
307 int
308 ipxip_route(so, sopt)
309 struct socket *so;
310 struct sockopt *sopt;
311 {
312 int error;
313 struct ifnet_en *ifn;
314 struct sockaddr_in *src;
315 struct ipxip_req rq;
316 struct sockaddr_ipx *ipx_dst;
317 struct sockaddr_in *ip_dst;
318 struct route ro;
319
320 error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
321 if (error)
322 return (error);
323 ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
324 ip_dst = (struct sockaddr_in *)&rq.rq_ip;
325
326 /*
327 * First, make sure we already have an IPX address:
328 */
329 if (ipx_ifaddr == NULL)
330 return (EADDRNOTAVAIL);
331 /*
332 * Now, determine if we can get to the destination
333 */
334 bzero((caddr_t)&ro, sizeof(ro));
335 ro.ro_dst = *(struct sockaddr *)ip_dst;
336 rtalloc_ign(&ro, 0);
337 if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
338 return (ENETUNREACH);
339 }
340
341 /*
342 * And see how he's going to get back to us:
343 * i.e., what return ip address do we use?
344 */
345 {
346 register struct in_ifaddr *ia;
347 struct ifnet *ifp = ro.ro_rt->rt_ifp;
348
349 for (ia = TAILQ_FIRST(&in_ifaddrhead); ia != NULL;
350 ia = TAILQ_NEXT(ia, ia_link))
351 if (ia->ia_ifp == ifp)
352 break;
353 if (ia == NULL)
354 ia = TAILQ_FIRST(&in_ifaddrhead);
355 if (ia == NULL) {
356 RTFREE(ro.ro_rt);
357 return (EADDRNOTAVAIL);
358 }
359 src = (struct sockaddr_in *)&ia->ia_addr;
360 }
361
362 /*
363 * Is there a free (pseudo-)interface or space?
364 */
365 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
366 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
367 break;
368 }
369 if (ifn == NULL)
370 ifn = ipxipattach();
371 if (ifn == NULL) {
372 RTFREE(ro.ro_rt);
373 return (ENOBUFS);
374 }
375 ifn->ifen_route = ro;
376 ifn->ifen_dst = ip_dst->sin_addr;
377 ifn->ifen_src = src->sin_addr;
378
379 /*
380 * now configure this as a point to point link
381 */
382 ifr_ipxip.ifr_name[4] = '' + ipxipif_units - 1;
383 ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
384 ipx_control(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
385 (struct ifnet *)ifn, sopt->sopt_td);
386
387 /* use any of our addresses */
388 satoipx_addr(ifr_ipxip.ifr_addr).x_host =
389 ipx_ifaddr->ia_addr.sipx_addr.x_host;
390
391 return (ipx_control(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
392 (struct ifnet *)ifn, sopt->sopt_td));
393 }
394
395 static int
396 ipxip_free(ifp)
397 struct ifnet *ifp;
398 {
399 register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
400 struct route *ro = & ifn->ifen_route;
401
402 if (ro->ro_rt != NULL) {
403 RTFREE(ro->ro_rt);
404 ro->ro_rt = NULL;
405 }
406 ifp->if_flags &= ~IFF_UP;
407 return (0);
408 }
409
410 void
411 ipxip_ctlinput(cmd, sa, dummy)
412 int cmd;
413 struct sockaddr *sa;
414 void *dummy;
415 {
416 struct sockaddr_in *sin;
417
418 if ((unsigned)cmd >= PRC_NCMDS)
419 return;
420 if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
421 return;
422 sin = (struct sockaddr_in *)sa;
423 if (sin->sin_addr.s_addr == INADDR_ANY)
424 return;
425
426 switch (cmd) {
427
428 case PRC_ROUTEDEAD:
429 case PRC_REDIRECT_NET:
430 case PRC_REDIRECT_HOST:
431 case PRC_REDIRECT_TOSNET:
432 case PRC_REDIRECT_TOSHOST:
433 ipxip_rtchange(&sin->sin_addr);
434 break;
435 }
436 }
437
438 static void
439 ipxip_rtchange(dst)
440 register struct in_addr *dst;
441 {
442 register struct ifnet_en *ifn;
443
444 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
445 if (ifn->ifen_dst.s_addr == dst->s_addr &&
446 ifn->ifen_route.ro_rt != NULL) {
447 RTFREE(ifn->ifen_route.ro_rt);
448 ifn->ifen_route.ro_rt = NULL;
449 }
450 }
451 }
452 #endif /* IPXIP */
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