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.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
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
36 * $FreeBSD: src/sys/netipx/ipx_ip.c,v 1.24.2.2 2003/01/23 21:06:48 sam Exp $
37 * $DragonFly: src/sys/netproto/ipx/ipx_ip.c,v 1.8 2004/01/06 03:17:28 dillon Exp $
41 * Software interface driver for encapsulating IPX in IP.
49 #error The option IPXIP requires option INET.
52 #include <sys/param.h>
53 #include <sys/systm.h>
54 #include <sys/malloc.h>
56 #include <sys/protosw.h>
57 #include <sys/socket.h>
58 #include <sys/socketvar.h>
59 #include <sys/sockio.h>
62 #include <net/netisr.h>
63 #include <net/route.h>
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>
76 static struct ifnet ipxipif;
77 static int ipxipif_units;
79 /* list of all hosts and gateways or broadcast addrs */
80 static struct ifnet_en *ipxip_list;
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);
90 static struct ifnet_en *
96 if (ipxipif.if_mtu == 0) {
98 if_initname(ifp, "ipxip", ipxipif_units);
100 ifp->if_ioctl = ipxipioctl;
101 ifp->if_output = ipxipoutput;
102 ifp->if_start = ipxipstart;
103 ifp->if_flags = IFF_POINTOPOINT;
106 MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT | M_ZERO);
109 m->ifen_next = ipxip_list;
111 ifp = &m->ifen_ifnet;
113 if_initname(ifp, "ipxip", ipxipif_units++);
115 ifp->if_ioctl = ipxipioctl;
116 ifp->if_output = ipxipoutput;
117 ifp->if_start = ipxipstart;
118 ifp->if_flags = IFF_POINTOPOINT;
126 * Process an ioctl request.
129 ipxipioctl(ifp, cmd, data)
140 ifp->if_flags |= IFF_UP;
145 * Everything else is done at a higher level.
150 ifr = (struct ifreq *)data;
151 if ((ifr->ifr_flags & IFF_UP) == 0)
152 error = ipxip_free(ifp);
161 static struct mbuf *ipxip_badlen;
162 static struct mbuf *ipxip_lastin;
163 static int ipxip_hold_input;
166 ipxip_input(m, hlen, dummy)
175 if (ipxip_hold_input) {
176 if (ipxip_lastin != NULL) {
177 m_freem(ipxip_lastin);
179 ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
182 * Get IP and IPX header together in first mbuf.
184 ipxipif.if_ipackets++;
185 s = sizeof(struct ip) + sizeof(struct ipx);
186 if (((m->m_flags & M_EXT) || m->m_len < s) &&
187 (m = m_pullup(m, s)) == NULL) {
188 ipxipif.if_ierrors++;
191 ip = mtod(m, struct ip *);
192 if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
193 ip_stripoptions(m, (struct mbuf *)NULL);
195 if ((m = m_pullup(m, s)) == NULL) {
196 ipxipif.if_ierrors++;
199 ip = mtod(m, struct ip *);
204 * Make mbuf data length reflect IPX length.
205 * If not enough data to reflect IPX length, drop.
207 m->m_data += sizeof(struct ip);
208 m->m_len -= sizeof(struct ip);
209 m->m_pkthdr.len -= sizeof(struct ip);
210 ipx = mtod(m, struct ipx *);
211 len = ntohs(ipx->ipx_len);
213 len++; /* Preserve Garbage Byte */
214 if (ip->ip_len != len) {
215 if (len > ip->ip_len) {
216 ipxipif.if_ierrors++;
218 m_freem(ipxip_badlen);
222 /* Any extra will be trimmed off by the IPX routines */
228 netisr_dispatch(NETISR_IPX, m);
232 ipxipoutput(ifp, m, dst, rt)
235 struct sockaddr *dst;
238 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
240 struct route *ro = &(ifn->ifen_route);
242 struct ipx *ipx = mtod(m, struct ipx *);
245 ifn->ifen_ifnet.if_opackets++;
246 ipxipif.if_opackets++;
249 * Calculate data length and make space
252 len = ntohs(ipx->ipx_len);
254 len++; /* Preserve Garbage Byte */
255 /* following clause not necessary on vax */
256 if (3 & (int)m->m_data) {
257 /* force longword alignment of ip hdr */
258 struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
263 MH_ALIGN(m0, sizeof(struct ip));
264 m0->m_flags = m->m_flags & M_COPYFLAGS;
266 m0->m_len = sizeof(struct ip);
267 m0->m_pkthdr.len = m0->m_len + m->m_len;
268 m->m_flags &= ~M_PKTHDR;
271 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
278 ip = mtod(m, struct ip *);
280 ip->ip_p = IPPROTO_IDP;
281 ip->ip_src = ifn->ifen_src;
282 ip->ip_dst = ifn->ifen_dst;
283 ip->ip_len = (u_short)len + sizeof(struct ip);
287 * Output final datagram.
289 error = (ip_output(m, (struct mbuf *)NULL, ro, SO_BROADCAST, NULL, NULL));
291 ifn->ifen_ifnet.if_oerrors++;
292 ifn->ifen_ifnet.if_ierrors = error;
296 return (ENETUNREACH);
303 panic("ipxip_start called\n");
306 static struct ifreq ifr_ipxip = {"ipxip0"};
309 ipxip_route(so, sopt)
311 struct sockopt *sopt;
314 struct ifnet_en *ifn;
315 struct sockaddr_in *src;
317 struct sockaddr_ipx *ipx_dst;
318 struct sockaddr_in *ip_dst;
321 error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
324 ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
325 ip_dst = (struct sockaddr_in *)&rq.rq_ip;
328 * First, make sure we already have an IPX address:
330 if (ipx_ifaddr == NULL)
331 return (EADDRNOTAVAIL);
333 * Now, determine if we can get to the destination
335 bzero((caddr_t)&ro, sizeof(ro));
336 ro.ro_dst = *(struct sockaddr *)ip_dst;
338 if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
339 return (ENETUNREACH);
343 * And see how he's going to get back to us:
344 * i.e., what return ip address do we use?
347 struct in_ifaddr *ia;
348 struct ifnet *ifp = ro.ro_rt->rt_ifp;
350 for (ia = TAILQ_FIRST(&in_ifaddrhead); ia != NULL;
351 ia = TAILQ_NEXT(ia, ia_link))
352 if (ia->ia_ifp == ifp)
355 ia = TAILQ_FIRST(&in_ifaddrhead);
358 return (EADDRNOTAVAIL);
360 src = (struct sockaddr_in *)&ia->ia_addr;
364 * Is there a free (pseudo-)interface or space?
366 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
367 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
376 ifn->ifen_route = ro;
377 ifn->ifen_dst = ip_dst->sin_addr;
378 ifn->ifen_src = src->sin_addr;
381 * now configure this as a point to point link
383 ifr_ipxip.ifr_name[4] = '0' + ipxipif_units - 1;
384 ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
385 ipx_control(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
386 (struct ifnet *)ifn, sopt->sopt_td);
388 /* use any of our addresses */
389 satoipx_addr(ifr_ipxip.ifr_addr).x_host =
390 ipx_ifaddr->ia_addr.sipx_addr.x_host;
392 return (ipx_control(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
393 (struct ifnet *)ifn, sopt->sopt_td));
400 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
401 struct route *ro = & ifn->ifen_route;
403 if (ro->ro_rt != NULL) {
407 ifp->if_flags &= ~IFF_UP;
412 ipxip_ctlinput(cmd, sa, dummy)
417 struct sockaddr_in *sin;
419 if ((unsigned)cmd >= PRC_NCMDS)
421 if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
423 sin = (struct sockaddr_in *)sa;
424 if (sin->sin_addr.s_addr == INADDR_ANY)
430 case PRC_REDIRECT_NET:
431 case PRC_REDIRECT_HOST:
432 case PRC_REDIRECT_TOSNET:
433 case PRC_REDIRECT_TOSHOST:
434 ipxip_rtchange(&sin->sin_addr);
443 struct ifnet_en *ifn;
445 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
446 if (ifn->ifen_dst.s_addr == dst->s_addr &&
447 ifn->ifen_route.ro_rt != NULL) {
448 RTFREE(ifn->ifen_route.ro_rt);
449 ifn->ifen_route.ro_rt = NULL;