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 1.18 2008/06/08 08:38:05 sephe 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>
61 #include <sys/msgport2.h>
64 #include <net/netisr.h>
65 #include <net/route.h>
67 #include <netinet/in.h>
68 #include <netinet/in_systm.h>
69 #include <netinet/in_var.h>
70 #include <netinet/ip.h>
71 #include <netinet/ip_var.h>
78 static struct ifnet ipxipif;
79 static int ipxipif_units;
81 /* list of all hosts and gateways or broadcast addrs */
82 static struct ifnet_en *ipxip_list;
84 static struct ifnet_en *ipxipattach(void);
85 static int ipxip_free(struct ifnet *ifp);
86 static int ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data,
88 static int ipxipoutput(struct ifnet *ifp, struct mbuf *m,
89 struct sockaddr *dst, struct rtentry *rt);
90 static void ipxip_rtchange(struct in_addr *dst);
91 static void ipxipstart(struct ifnet *ifp);
93 static struct ifnet_en *
99 if (ipxipif.if_mtu == 0) {
101 if_initname(ifp, "ipxip", ipxipif_units);
103 ifp->if_ioctl = ipxipioctl;
104 ifp->if_output = ipxipoutput;
105 ifp->if_start = ipxipstart;
106 ifp->if_flags = IFF_POINTOPOINT;
109 MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_WAITOK | M_ZERO);
110 m->ifen_next = ipxip_list;
112 ifp = &m->ifen_ifnet;
114 if_initname(ifp, "ipxip", ipxipif_units++);
116 ifp->if_ioctl = ipxipioctl;
117 ifp->if_output = ipxipoutput;
118 ifp->if_start = ipxipstart;
119 ifp->if_flags = IFF_POINTOPOINT;
120 if_attach(ifp, NULL);
127 * Process an ioctl request.
130 ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
138 ifp->if_flags |= IFF_UP;
143 * Everything else is done at a higher level.
148 ifr = (struct ifreq *)data;
149 if ((ifr->ifr_flags & IFF_UP) == 0)
150 error = ipxip_free(ifp);
159 static struct mbuf *ipxip_badlen;
160 static struct mbuf *ipxip_lastin;
161 static int ipxip_hold_input;
164 ipxip_input(struct mbuf **mp, int *offp, int proto)
166 struct mbuf *m = *mp;
171 if (ipxip_hold_input) {
172 if (ipxip_lastin != NULL) {
173 m_freem(ipxip_lastin);
175 ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, MB_DONTWAIT);
178 * Get IP and IPX header together in first mbuf.
180 ipxipif.if_ipackets++;
181 s = sizeof(struct ip) + sizeof(struct ipx);
182 if (((m->m_flags & M_EXT) || m->m_len < s) &&
183 (m = m_pullup(m, s)) == NULL) {
184 ipxipif.if_ierrors++;
185 return(IPPROTO_DONE);
187 ip = mtod(m, struct ip *);
188 if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
191 if ((m = m_pullup(m, s)) == NULL) {
192 ipxipif.if_ierrors++;
193 return(IPPROTO_DONE);
195 ip = mtod(m, struct ip *);
200 * Make mbuf data length reflect IPX length.
201 * If not enough data to reflect IPX length, drop.
203 m->m_data += sizeof(struct ip);
204 m->m_len -= sizeof(struct ip);
205 m->m_pkthdr.len -= sizeof(struct ip);
206 ipx = mtod(m, struct ipx *);
207 len = ntohs(ipx->ipx_len);
209 len++; /* Preserve Garbage Byte */
210 if (ip->ip_len != len) {
211 if (len > ip->ip_len) {
212 ipxipif.if_ierrors++;
214 m_freem(ipxip_badlen);
216 return(IPPROTO_DONE);
218 /* Any extra will be trimmed off by the IPX routines */
224 netisr_queue(NETISR_IPX, m);
225 return(IPPROTO_DONE);
229 ipxipoutput_serialized(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
232 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
234 struct route *ro = &(ifn->ifen_route);
236 struct ipx *ipx = mtod(m, struct ipx *);
239 ifn->ifen_ifnet.if_opackets++;
240 ipxipif.if_opackets++;
243 * Calculate data length and make space
246 len = ntohs(ipx->ipx_len);
248 len++; /* Preserve Garbage Byte */
249 /* following clause not necessary on vax */
250 if (3 & (int)m->m_data) {
251 /* force longword alignment of ip hdr */
252 struct mbuf *m0 = m_gethdr(MT_HEADER, MB_DONTWAIT);
257 MH_ALIGN(m0, sizeof(struct ip));
258 m0->m_flags = m->m_flags & M_COPYFLAGS;
260 m0->m_len = sizeof(struct ip);
261 m0->m_pkthdr.len = m0->m_len + m->m_len;
264 M_PREPEND(m, sizeof(struct ip), MB_DONTWAIT);
271 ip = mtod(m, struct ip *);
273 ip->ip_p = IPPROTO_IDP;
274 ip->ip_src = ifn->ifen_src;
275 ip->ip_dst = ifn->ifen_dst;
276 ip->ip_len = (u_short)len + sizeof(struct ip);
280 * Output final datagram.
282 error = (ip_output(m, NULL, ro, SO_BROADCAST, NULL, NULL));
284 ifn->ifen_ifnet.if_oerrors++;
285 ifn->ifen_ifnet.if_ierrors = error;
289 return (ENETUNREACH);
293 ipxipoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
298 ifnet_serialize_tx(ifp);
299 error = ipxipoutput_serialized(ifp, m, dst, rt);
300 ifnet_deserialize_tx(ifp);
306 ipxipstart(struct ifnet *ifp)
308 panic("ipxip_start called\n");
311 static struct ifreq ifr_ipxip = {"ipxip0"};
314 ipxip_route(struct socket *so, struct sockopt *sopt)
317 struct ifnet_en *ifn;
318 struct sockaddr_in *src;
320 struct sockaddr_ipx *ipx_dst;
321 struct sockaddr_in *ip_dst;
324 error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
327 ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
328 ip_dst = (struct sockaddr_in *)&rq.rq_ip;
331 * First, make sure we already have an IPX address:
333 if (ipx_ifaddr == NULL)
334 return (EADDRNOTAVAIL);
336 * Now, determine if we can get to the destination
338 bzero((caddr_t)&ro, sizeof(ro));
339 ro.ro_dst = *(struct sockaddr *)ip_dst;
341 if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
342 return (ENETUNREACH);
346 * And see how he's going to get back to us:
347 * i.e., what return ip address do we use?
350 struct in_ifaddr *ia;
351 struct in_ifaddr_container *iac;
352 struct ifnet *ifp = ro.ro_rt->rt_ifp;
355 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
356 if (iac->ia->ia_ifp == ifp) {
361 if (ia == NULL && !TAILQ_EMPTY(&in_ifaddrheads[mycpuid]))
362 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
365 return (EADDRNOTAVAIL);
367 src = (struct sockaddr_in *)&ia->ia_addr;
371 * Is there a free (pseudo-)interface or space?
373 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
374 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
383 ifn->ifen_route = ro;
384 ifn->ifen_dst = ip_dst->sin_addr;
385 ifn->ifen_src = src->sin_addr;
388 * now configure this as a point to point link
390 ifr_ipxip.ifr_name[4] = '0' + ipxipif_units - 1;
391 ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
392 ipx_control_oncpu(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
393 (struct ifnet *)ifn, sopt->sopt_td);
395 /* use any of our addresses */
396 satoipx_addr(ifr_ipxip.ifr_addr).x_host =
397 ipx_ifaddr->ia_addr.sipx_addr.x_host;
399 return (ipx_control_oncpu(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
400 (struct ifnet *)ifn, sopt->sopt_td));
404 ipxip_free(struct ifnet *ifp)
406 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
407 struct route *ro = & ifn->ifen_route;
409 if (ro->ro_rt != NULL) {
413 ifp->if_flags &= ~IFF_UP;
418 ipxip_ctlinput(netmsg_t msg)
420 int cmd = msg->ctlinput.nm_cmd;
421 struct sockaddr *sa = msg->ctlinput.nm_arg;
422 struct sockaddr_in *sin;
424 if ((unsigned)cmd >= PRC_NCMDS)
426 if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
428 sin = (struct sockaddr_in *)sa;
429 if (sin->sin_addr.s_addr == INADDR_ANY)
435 case PRC_REDIRECT_NET:
436 case PRC_REDIRECT_HOST:
437 case PRC_REDIRECT_TOSNET:
438 case PRC_REDIRECT_TOSHOST:
439 ipxip_rtchange(&sin->sin_addr);
443 lwkt_replymsg(&msg->lmsg, 0);
447 ipxip_rtchange(struct in_addr *dst)
449 struct ifnet_en *ifn;
451 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
452 if (ifn->ifen_dst.s_addr == dst->s_addr &&
453 ifn->ifen_route.ro_rt != NULL) {
454 RTFREE(ifn->ifen_route.ro_rt);
455 ifn->ifen_route.ro_rt = NULL;