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 $
40 * Software interface driver for encapsulating IPX in IP.
48 #error The option IPXIP requires option INET.
51 #include <sys/param.h>
52 #include <sys/systm.h>
53 #include <sys/malloc.h>
55 #include <sys/protosw.h>
56 #include <sys/socket.h>
57 #include <sys/socketvar.h>
58 #include <sys/sockio.h>
60 #include <sys/msgport2.h>
63 #include <net/netisr.h>
64 #include <net/route.h>
66 #include <netinet/in.h>
67 #include <netinet/in_systm.h>
68 #include <netinet/in_var.h>
69 #include <netinet/ip.h>
70 #include <netinet/ip_var.h>
77 static struct ifnet ipxipif;
78 static int ipxipif_units;
80 /* list of all hosts and gateways or broadcast addrs */
81 static struct ifnet_en *ipxip_list;
83 static struct ifnet_en *ipxipattach(void);
84 static int ipxip_free(struct ifnet *ifp);
85 static int ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data,
87 static int ipxipoutput(struct ifnet *ifp, struct mbuf *m,
88 struct sockaddr *dst, struct rtentry *rt);
89 static void ipxip_rtchange(struct in_addr *dst);
90 static void ipxipstart(struct ifnet *ifp);
92 static struct ifnet_en *
98 if (ipxipif.if_mtu == 0) {
100 if_initname(ifp, "ipxip", ipxipif_units);
102 ifp->if_ioctl = ipxipioctl;
103 ifp->if_output = ipxipoutput;
104 ifp->if_start = ipxipstart;
105 ifp->if_flags = IFF_POINTOPOINT;
108 (m) = kmalloc(sizeof(*m), M_PCB, M_WAITOK | 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;
119 if_attach(ifp, NULL);
126 * Process an ioctl request.
129 ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
137 ifp->if_flags |= IFF_UP;
142 * Everything else is done at a higher level.
147 ifr = (struct ifreq *)data;
148 if ((ifr->ifr_flags & IFF_UP) == 0)
149 error = ipxip_free(ifp);
158 static struct mbuf *ipxip_badlen;
159 static struct mbuf *ipxip_lastin;
160 static int ipxip_hold_input;
163 ipxip_input(struct mbuf **mp, int *offp, int proto)
165 struct mbuf *m = *mp;
170 if (ipxip_hold_input) {
171 if (ipxip_lastin != NULL) {
172 m_freem(ipxip_lastin);
174 ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, MB_DONTWAIT);
177 * Get IP and IPX header together in first mbuf.
179 ipxipif.if_ipackets++;
180 s = sizeof(struct ip) + sizeof(struct ipx);
181 if (((m->m_flags & M_EXT) || m->m_len < s) &&
182 (m = m_pullup(m, s)) == NULL) {
183 ipxipif.if_ierrors++;
184 return(IPPROTO_DONE);
186 ip = mtod(m, struct ip *);
187 if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
190 if ((m = m_pullup(m, s)) == NULL) {
191 ipxipif.if_ierrors++;
192 return(IPPROTO_DONE);
194 ip = mtod(m, struct ip *);
199 * Make mbuf data length reflect IPX length.
200 * If not enough data to reflect IPX length, drop.
202 m->m_data += sizeof(struct ip);
203 m->m_len -= sizeof(struct ip);
204 m->m_pkthdr.len -= sizeof(struct ip);
205 ipx = mtod(m, struct ipx *);
206 len = ntohs(ipx->ipx_len);
208 len++; /* Preserve Garbage Byte */
209 if (ip->ip_len != len) {
210 if (len > ip->ip_len) {
211 ipxipif.if_ierrors++;
213 m_freem(ipxip_badlen);
215 return(IPPROTO_DONE);
217 /* Any extra will be trimmed off by the IPX routines */
223 netisr_queue(NETISR_IPX, m);
224 return(IPPROTO_DONE);
228 ipxipoutput_serialized(struct ifnet *ifp, struct mbuf *m, 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 & (intptr_t)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, NULL, ro, SO_BROADCAST, NULL, NULL));
283 ifn->ifen_ifnet.if_oerrors++;
284 ifn->ifen_ifnet.if_ierrors = error;
288 return (ENETUNREACH);
292 ipxipoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
297 ifnet_serialize_tx(ifp);
298 error = ipxipoutput_serialized(ifp, m, dst, rt);
299 ifnet_deserialize_tx(ifp);
305 ipxipstart(struct ifnet *ifp)
307 panic("ipxip_start called");
310 static struct ifreq ifr_ipxip = {"ipxip0"};
313 ipxip_route(struct socket *so, struct sockopt *sopt)
316 struct ifnet_en *ifn;
317 struct sockaddr_in *src;
319 struct sockaddr_ipx *ipx_dst;
320 struct sockaddr_in *ip_dst;
323 error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
326 ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
327 ip_dst = (struct sockaddr_in *)&rq.rq_ip;
330 * First, make sure we already have an IPX address:
332 if (ipx_ifaddr == NULL)
333 return (EADDRNOTAVAIL);
335 * Now, determine if we can get to the destination
337 bzero((caddr_t)&ro, sizeof(ro));
338 ro.ro_dst = *(struct sockaddr *)ip_dst;
340 if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
341 return (ENETUNREACH);
345 * And see how he's going to get back to us:
346 * i.e., what return ip address do we use?
349 struct in_ifaddr *ia;
350 struct in_ifaddr_container *iac;
351 struct ifnet *ifp = ro.ro_rt->rt_ifp;
354 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
355 if (iac->ia->ia_ifp == ifp) {
360 if (ia == NULL && !TAILQ_EMPTY(&in_ifaddrheads[mycpuid]))
361 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
364 return (EADDRNOTAVAIL);
366 src = (struct sockaddr_in *)&ia->ia_addr;
370 * Is there a free (pseudo-)interface or space?
372 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
373 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
382 ifn->ifen_route = ro;
383 ifn->ifen_dst = ip_dst->sin_addr;
384 ifn->ifen_src = src->sin_addr;
387 * now configure this as a point to point link
389 ifr_ipxip.ifr_name[4] = '0' + ipxipif_units - 1;
390 ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
391 ipx_control_oncpu(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
392 (struct ifnet *)ifn, sopt->sopt_td);
394 /* use any of our addresses */
395 satoipx_addr(ifr_ipxip.ifr_addr).x_host =
396 ipx_ifaddr->ia_addr.sipx_addr.x_host;
398 return (ipx_control_oncpu(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
399 (struct ifnet *)ifn, sopt->sopt_td));
403 ipxip_free(struct ifnet *ifp)
405 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
406 struct route *ro = & ifn->ifen_route;
408 if (ro->ro_rt != NULL) {
412 ifp->if_flags &= ~IFF_UP;
417 ipxip_ctlinput(netmsg_t msg)
419 int cmd = msg->ctlinput.nm_cmd;
420 struct sockaddr *sa = msg->ctlinput.nm_arg;
421 struct sockaddr_in *sin;
423 if ((unsigned)cmd >= PRC_NCMDS)
425 if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
427 sin = (struct sockaddr_in *)sa;
428 if (sin->sin_addr.s_addr == INADDR_ANY)
434 case PRC_REDIRECT_NET:
435 case PRC_REDIRECT_HOST:
436 case PRC_REDIRECT_TOSNET:
437 case PRC_REDIRECT_TOSHOST:
438 ipxip_rtchange(&sin->sin_addr);
442 lwkt_replymsg(&msg->lmsg, 0);
446 ipxip_rtchange(struct in_addr *dst)
448 struct ifnet_en *ifn;
450 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
451 if (ifn->ifen_dst.s_addr == dst->s_addr &&
452 ifn->ifen_route.ro_rt != NULL) {
453 RTFREE(ifn->ifen_route.ro_rt);
454 ifn->ifen_route.ro_rt = NULL;