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 1.16 2006/01/14 13:36:40 swildner 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(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
228 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
230 struct route *ro = &(ifn->ifen_route);
232 struct ipx *ipx = mtod(m, struct ipx *);
235 ifn->ifen_ifnet.if_opackets++;
236 ipxipif.if_opackets++;
239 * Calculate data length and make space
242 len = ntohs(ipx->ipx_len);
244 len++; /* Preserve Garbage Byte */
245 /* following clause not necessary on vax */
246 if (3 & (int)m->m_data) {
247 /* force longword alignment of ip hdr */
248 struct mbuf *m0 = m_gethdr(MT_HEADER, MB_DONTWAIT);
253 MH_ALIGN(m0, sizeof(struct ip));
254 m0->m_flags = m->m_flags & M_COPYFLAGS;
256 m0->m_len = sizeof(struct ip);
257 m0->m_pkthdr.len = m0->m_len + m->m_len;
260 M_PREPEND(m, sizeof(struct ip), MB_DONTWAIT);
267 ip = mtod(m, struct ip *);
269 ip->ip_p = IPPROTO_IDP;
270 ip->ip_src = ifn->ifen_src;
271 ip->ip_dst = ifn->ifen_dst;
272 ip->ip_len = (u_short)len + sizeof(struct ip);
276 * Output final datagram.
278 error = (ip_output(m, (struct mbuf *)NULL, ro, SO_BROADCAST, NULL, NULL));
280 ifn->ifen_ifnet.if_oerrors++;
281 ifn->ifen_ifnet.if_ierrors = error;
285 return (ENETUNREACH);
289 ipxipstart(struct ifnet *ifp)
291 panic("ipxip_start called\n");
294 static struct ifreq ifr_ipxip = {"ipxip0"};
297 ipxip_route(struct socket *so, struct sockopt *sopt)
300 struct ifnet_en *ifn;
301 struct sockaddr_in *src;
303 struct sockaddr_ipx *ipx_dst;
304 struct sockaddr_in *ip_dst;
307 error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
310 ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
311 ip_dst = (struct sockaddr_in *)&rq.rq_ip;
314 * First, make sure we already have an IPX address:
316 if (ipx_ifaddr == NULL)
317 return (EADDRNOTAVAIL);
319 * Now, determine if we can get to the destination
321 bzero((caddr_t)&ro, sizeof(ro));
322 ro.ro_dst = *(struct sockaddr *)ip_dst;
324 if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
325 return (ENETUNREACH);
329 * And see how he's going to get back to us:
330 * i.e., what return ip address do we use?
333 struct in_ifaddr *ia;
334 struct ifnet *ifp = ro.ro_rt->rt_ifp;
336 for (ia = TAILQ_FIRST(&in_ifaddrhead); ia != NULL;
337 ia = TAILQ_NEXT(ia, ia_link))
338 if (ia->ia_ifp == ifp)
341 ia = TAILQ_FIRST(&in_ifaddrhead);
344 return (EADDRNOTAVAIL);
346 src = (struct sockaddr_in *)&ia->ia_addr;
350 * Is there a free (pseudo-)interface or space?
352 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
353 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
362 ifn->ifen_route = ro;
363 ifn->ifen_dst = ip_dst->sin_addr;
364 ifn->ifen_src = src->sin_addr;
367 * now configure this as a point to point link
369 ifr_ipxip.ifr_name[4] = '0' + ipxipif_units - 1;
370 ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
371 ipx_control(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
372 (struct ifnet *)ifn, sopt->sopt_td);
374 /* use any of our addresses */
375 satoipx_addr(ifr_ipxip.ifr_addr).x_host =
376 ipx_ifaddr->ia_addr.sipx_addr.x_host;
378 return (ipx_control(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
379 (struct ifnet *)ifn, sopt->sopt_td));
383 ipxip_free(struct ifnet *ifp)
385 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
386 struct route *ro = & ifn->ifen_route;
388 if (ro->ro_rt != NULL) {
392 ifp->if_flags &= ~IFF_UP;
397 ipxip_ctlinput(int cmd, struct sockaddr *sa, void *dummy)
399 struct sockaddr_in *sin;
401 if ((unsigned)cmd >= PRC_NCMDS)
403 if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
405 sin = (struct sockaddr_in *)sa;
406 if (sin->sin_addr.s_addr == INADDR_ANY)
412 case PRC_REDIRECT_NET:
413 case PRC_REDIRECT_HOST:
414 case PRC_REDIRECT_TOSNET:
415 case PRC_REDIRECT_TOSHOST:
416 ipxip_rtchange(&sin->sin_addr);
422 ipxip_rtchange(struct in_addr *dst)
424 struct ifnet_en *ifn;
426 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
427 if (ifn->ifen_dst.s_addr == dst->s_addr &&
428 ifn->ifen_route.ro_rt != NULL) {
429 RTFREE(ifn->ifen_route.ro_rt);
430 ifn->ifen_route.ro_rt = NULL;