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 1.15 2005/11/28 17:13:46 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,
86 static int ipxipoutput(struct ifnet *ifp, struct mbuf *m,
87 struct sockaddr *dst, struct rtentry *rt);
88 static void ipxip_rtchange(struct in_addr *dst);
89 static void ipxipstart(struct ifnet *ifp);
91 static struct ifnet_en *
97 if (ipxipif.if_mtu == 0) {
99 if_initname(ifp, "ipxip", ipxipif_units);
101 ifp->if_ioctl = ipxipioctl;
102 ifp->if_output = ipxipoutput;
103 ifp->if_start = ipxipstart;
104 ifp->if_flags = IFF_POINTOPOINT;
107 MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_WAITOK | M_ZERO);
108 m->ifen_next = ipxip_list;
110 ifp = &m->ifen_ifnet;
112 if_initname(ifp, "ipxip", ipxipif_units++);
114 ifp->if_ioctl = ipxipioctl;
115 ifp->if_output = ipxipoutput;
116 ifp->if_start = ipxipstart;
117 ifp->if_flags = IFF_POINTOPOINT;
118 if_attach(ifp, NULL);
125 * Process an ioctl request.
128 ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
136 ifp->if_flags |= IFF_UP;
141 * Everything else is done at a higher level.
146 ifr = (struct ifreq *)data;
147 if ((ifr->ifr_flags & IFF_UP) == 0)
148 error = ipxip_free(ifp);
157 static struct mbuf *ipxip_badlen;
158 static struct mbuf *ipxip_lastin;
159 static int ipxip_hold_input;
162 ipxip_input(struct mbuf *m, ...)
168 if (ipxip_hold_input) {
169 if (ipxip_lastin != NULL) {
170 m_freem(ipxip_lastin);
172 ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, MB_DONTWAIT);
175 * Get IP and IPX header together in first mbuf.
177 ipxipif.if_ipackets++;
178 s = sizeof(struct ip) + sizeof(struct ipx);
179 if (((m->m_flags & M_EXT) || m->m_len < s) &&
180 (m = m_pullup(m, s)) == NULL) {
181 ipxipif.if_ierrors++;
184 ip = mtod(m, struct ip *);
185 if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
188 if ((m = m_pullup(m, s)) == NULL) {
189 ipxipif.if_ierrors++;
192 ip = mtod(m, struct ip *);
197 * Make mbuf data length reflect IPX length.
198 * If not enough data to reflect IPX length, drop.
200 m->m_data += sizeof(struct ip);
201 m->m_len -= sizeof(struct ip);
202 m->m_pkthdr.len -= sizeof(struct ip);
203 ipx = mtod(m, struct ipx *);
204 len = ntohs(ipx->ipx_len);
206 len++; /* Preserve Garbage Byte */
207 if (ip->ip_len != len) {
208 if (len > ip->ip_len) {
209 ipxipif.if_ierrors++;
211 m_freem(ipxip_badlen);
215 /* Any extra will be trimmed off by the IPX routines */
221 netisr_dispatch(NETISR_IPX, m);
225 ipxipoutput(ifp, m, dst, rt)
228 struct sockaddr *dst;
231 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
233 struct route *ro = &(ifn->ifen_route);
235 struct ipx *ipx = mtod(m, struct ipx *);
238 ifn->ifen_ifnet.if_opackets++;
239 ipxipif.if_opackets++;
242 * Calculate data length and make space
245 len = ntohs(ipx->ipx_len);
247 len++; /* Preserve Garbage Byte */
248 /* following clause not necessary on vax */
249 if (3 & (int)m->m_data) {
250 /* force longword alignment of ip hdr */
251 struct mbuf *m0 = m_gethdr(MT_HEADER, MB_DONTWAIT);
256 MH_ALIGN(m0, sizeof(struct ip));
257 m0->m_flags = m->m_flags & M_COPYFLAGS;
259 m0->m_len = sizeof(struct ip);
260 m0->m_pkthdr.len = m0->m_len + m->m_len;
263 M_PREPEND(m, sizeof(struct ip), MB_DONTWAIT);
270 ip = mtod(m, struct ip *);
272 ip->ip_p = IPPROTO_IDP;
273 ip->ip_src = ifn->ifen_src;
274 ip->ip_dst = ifn->ifen_dst;
275 ip->ip_len = (u_short)len + sizeof(struct ip);
279 * Output final datagram.
281 error = (ip_output(m, (struct mbuf *)NULL, ro, SO_BROADCAST, NULL, NULL));
283 ifn->ifen_ifnet.if_oerrors++;
284 ifn->ifen_ifnet.if_ierrors = error;
288 return (ENETUNREACH);
295 panic("ipxip_start called\n");
298 static struct ifreq ifr_ipxip = {"ipxip0"};
301 ipxip_route(so, sopt)
303 struct sockopt *sopt;
306 struct ifnet_en *ifn;
307 struct sockaddr_in *src;
309 struct sockaddr_ipx *ipx_dst;
310 struct sockaddr_in *ip_dst;
313 error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
316 ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
317 ip_dst = (struct sockaddr_in *)&rq.rq_ip;
320 * First, make sure we already have an IPX address:
322 if (ipx_ifaddr == NULL)
323 return (EADDRNOTAVAIL);
325 * Now, determine if we can get to the destination
327 bzero((caddr_t)&ro, sizeof(ro));
328 ro.ro_dst = *(struct sockaddr *)ip_dst;
330 if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
331 return (ENETUNREACH);
335 * And see how he's going to get back to us:
336 * i.e., what return ip address do we use?
339 struct in_ifaddr *ia;
340 struct ifnet *ifp = ro.ro_rt->rt_ifp;
342 for (ia = TAILQ_FIRST(&in_ifaddrhead); ia != NULL;
343 ia = TAILQ_NEXT(ia, ia_link))
344 if (ia->ia_ifp == ifp)
347 ia = TAILQ_FIRST(&in_ifaddrhead);
350 return (EADDRNOTAVAIL);
352 src = (struct sockaddr_in *)&ia->ia_addr;
356 * Is there a free (pseudo-)interface or space?
358 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
359 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
368 ifn->ifen_route = ro;
369 ifn->ifen_dst = ip_dst->sin_addr;
370 ifn->ifen_src = src->sin_addr;
373 * now configure this as a point to point link
375 ifr_ipxip.ifr_name[4] = '0' + ipxipif_units - 1;
376 ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
377 ipx_control(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
378 (struct ifnet *)ifn, sopt->sopt_td);
380 /* use any of our addresses */
381 satoipx_addr(ifr_ipxip.ifr_addr).x_host =
382 ipx_ifaddr->ia_addr.sipx_addr.x_host;
384 return (ipx_control(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
385 (struct ifnet *)ifn, sopt->sopt_td));
392 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
393 struct route *ro = & ifn->ifen_route;
395 if (ro->ro_rt != NULL) {
399 ifp->if_flags &= ~IFF_UP;
404 ipxip_ctlinput(cmd, sa, dummy)
409 struct sockaddr_in *sin;
411 if ((unsigned)cmd >= PRC_NCMDS)
413 if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
415 sin = (struct sockaddr_in *)sa;
416 if (sin->sin_addr.s_addr == INADDR_ANY)
422 case PRC_REDIRECT_NET:
423 case PRC_REDIRECT_HOST:
424 case PRC_REDIRECT_TOSNET:
425 case PRC_REDIRECT_TOSHOST:
426 ipxip_rtchange(&sin->sin_addr);
435 struct ifnet_en *ifn;
437 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
438 if (ifn->ifen_dst.s_addr == dst->s_addr &&
439 ifn->ifen_route.ro_rt != NULL) {
440 RTFREE(ifn->ifen_route.ro_rt);
441 ifn->ifen_route.ro_rt = NULL;