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>
61 #include <net/netisr.h>
62 #include <net/route.h>
64 #include <netinet/in.h>
65 #include <netinet/in_systm.h>
66 #include <netinet/in_var.h>
67 #include <netinet/ip.h>
68 #include <netinet/ip_var.h>
70 #include <netipx/ipx.h>
71 #include <netipx/ipx_if.h>
72 #include <netipx/ipx_ip.h>
73 #include <netipx/ipx_var.h>
75 static struct ifnet ipxipif;
77 /* list of all hosts and gateways or broadcast addrs */
78 static struct ifnet_en *ipxip_list;
80 static struct ifnet_en *ipxipattach(void);
81 static int ipxip_free(struct ifnet *ifp);
82 static int ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data);
83 static int ipxipoutput(struct ifnet *ifp, struct mbuf *m,
84 struct sockaddr *dst, struct rtentry *rt);
85 static void ipxip_rtchange(struct in_addr *dst);
86 static void ipxipstart(struct ifnet *ifp);
88 static struct ifnet_en *
91 register struct ifnet_en *m;
92 register struct ifnet *ifp;
94 if (ipxipif.if_mtu == 0) {
96 ifp->if_name = "ipxip";
98 ifp->if_ioctl = ipxipioctl;
99 ifp->if_output = ipxipoutput;
100 ifp->if_start = ipxipstart;
101 ifp->if_flags = IFF_POINTOPOINT;
104 MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_NOWAIT | M_ZERO);
107 m->ifen_next = ipxip_list;
109 ifp = &m->ifen_ifnet;
111 ifp->if_name = "ipxip";
113 ifp->if_ioctl = ipxipioctl;
114 ifp->if_output = ipxipoutput;
115 ifp->if_start = ipxipstart;
116 ifp->if_flags = IFF_POINTOPOINT;
117 ifp->if_unit = ipxipif.if_unit++;
125 * Process an ioctl request.
128 ipxipioctl(ifp, cmd, data)
129 register struct ifnet *ifp;
139 ifp->if_flags |= IFF_UP;
144 * Everything else is done at a higher level.
149 ifr = (struct ifreq *)data;
150 if ((ifr->ifr_flags & IFF_UP) == 0)
151 error = ipxip_free(ifp);
160 static struct mbuf *ipxip_badlen;
161 static struct mbuf *ipxip_lastin;
162 static int ipxip_hold_input;
166 register struct mbuf *m;
169 register struct ip *ip;
170 register struct ipx *ipx;
171 register struct ifqueue *ifq = &ipxintrq;
174 if (ipxip_hold_input) {
175 if (ipxip_lastin != NULL) {
176 m_freem(ipxip_lastin);
178 ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, M_DONTWAIT);
181 * Get IP and IPX header together in first mbuf.
183 ipxipif.if_ipackets++;
184 s = sizeof(struct ip) + sizeof(struct ipx);
185 if (((m->m_flags & M_EXT) || m->m_len < s) &&
186 (m = m_pullup(m, s)) == NULL) {
187 ipxipif.if_ierrors++;
190 ip = mtod(m, struct ip *);
191 if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
192 ip_stripoptions(m, (struct mbuf *)NULL);
194 if ((m = m_pullup(m, s)) == NULL) {
195 ipxipif.if_ierrors++;
198 ip = mtod(m, struct ip *);
203 * Make mbuf data length reflect IPX length.
204 * If not enough data to reflect IPX length, drop.
206 m->m_data += sizeof(struct ip);
207 m->m_len -= sizeof(struct ip);
208 m->m_pkthdr.len -= sizeof(struct ip);
209 ipx = mtod(m, struct ipx *);
210 len = ntohs(ipx->ipx_len);
212 len++; /* Preserve Garbage Byte */
213 if (ip->ip_len != len) {
214 if (len > ip->ip_len) {
215 ipxipif.if_ierrors++;
217 m_freem(ipxip_badlen);
221 /* Any extra will be trimmed off by the IPX routines */
235 schednetisr(NETISR_IPX);
241 ipxipoutput(ifp, m, dst, rt)
244 struct sockaddr *dst;
247 register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
248 register struct ip *ip;
249 register struct route *ro = &(ifn->ifen_route);
250 register int len = 0;
251 register struct ipx *ipx = mtod(m, struct ipx *);
254 ifn->ifen_ifnet.if_opackets++;
255 ipxipif.if_opackets++;
258 * Calculate data length and make space
261 len = ntohs(ipx->ipx_len);
263 len++; /* Preserve Garbage Byte */
264 /* following clause not necessary on vax */
265 if (3 & (int)m->m_data) {
266 /* force longword alignment of ip hdr */
267 struct mbuf *m0 = m_gethdr(MT_HEADER, M_DONTWAIT);
272 MH_ALIGN(m0, sizeof(struct ip));
273 m0->m_flags = m->m_flags & M_COPYFLAGS;
275 m0->m_len = sizeof(struct ip);
276 m0->m_pkthdr.len = m0->m_len + m->m_len;
277 m->m_flags &= ~M_PKTHDR;
280 M_PREPEND(m, sizeof(struct ip), M_DONTWAIT);
287 ip = mtod(m, struct ip *);
289 ip->ip_p = IPPROTO_IDP;
290 ip->ip_src = ifn->ifen_src;
291 ip->ip_dst = ifn->ifen_dst;
292 ip->ip_len = (u_short)len + sizeof(struct ip);
296 * Output final datagram.
298 error = (ip_output(m, (struct mbuf *)NULL, ro, SO_BROADCAST, NULL, NULL));
300 ifn->ifen_ifnet.if_oerrors++;
301 ifn->ifen_ifnet.if_ierrors = error;
305 return (ENETUNREACH);
312 panic("ipxip_start called\n");
315 static struct ifreq ifr_ipxip = {"ipxip0"};
318 ipxip_route(so, sopt)
320 struct sockopt *sopt;
323 struct ifnet_en *ifn;
324 struct sockaddr_in *src;
326 struct sockaddr_ipx *ipx_dst;
327 struct sockaddr_in *ip_dst;
330 error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
333 ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
334 ip_dst = (struct sockaddr_in *)&rq.rq_ip;
337 * First, make sure we already have an IPX address:
339 if (ipx_ifaddr == NULL)
340 return (EADDRNOTAVAIL);
342 * Now, determine if we can get to the destination
344 bzero((caddr_t)&ro, sizeof(ro));
345 ro.ro_dst = *(struct sockaddr *)ip_dst;
347 if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
348 return (ENETUNREACH);
352 * And see how he's going to get back to us:
353 * i.e., what return ip address do we use?
356 register struct in_ifaddr *ia;
357 struct ifnet *ifp = ro.ro_rt->rt_ifp;
359 for (ia = TAILQ_FIRST(&in_ifaddrhead); ia != NULL;
360 ia = TAILQ_NEXT(ia, ia_link))
361 if (ia->ia_ifp == ifp)
364 ia = TAILQ_FIRST(&in_ifaddrhead);
367 return (EADDRNOTAVAIL);
369 src = (struct sockaddr_in *)&ia->ia_addr;
373 * Is there a free (pseudo-)interface or space?
375 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
376 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
385 ifn->ifen_route = ro;
386 ifn->ifen_dst = ip_dst->sin_addr;
387 ifn->ifen_src = src->sin_addr;
390 * now configure this as a point to point link
392 ifr_ipxip.ifr_name[4] = '0' + ipxipif.if_unit - 1;
393 ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
394 ipx_control(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
395 (struct ifnet *)ifn, sopt->sopt_p);
397 /* use any of our addresses */
398 satoipx_addr(ifr_ipxip.ifr_addr).x_host =
399 ipx_ifaddr->ia_addr.sipx_addr.x_host;
401 return (ipx_control(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
402 (struct ifnet *)ifn, sopt->sopt_p));
409 register struct ifnet_en *ifn = (struct ifnet_en *)ifp;
410 struct route *ro = & ifn->ifen_route;
412 if (ro->ro_rt != NULL) {
416 ifp->if_flags &= ~IFF_UP;
421 ipxip_ctlinput(cmd, sa, dummy)
426 struct sockaddr_in *sin;
428 if ((unsigned)cmd >= PRC_NCMDS)
430 if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
432 sin = (struct sockaddr_in *)sa;
433 if (sin->sin_addr.s_addr == INADDR_ANY)
439 case PRC_REDIRECT_NET:
440 case PRC_REDIRECT_HOST:
441 case PRC_REDIRECT_TOSNET:
442 case PRC_REDIRECT_TOSHOST:
443 ipxip_rtchange(&sin->sin_addr);
450 register struct in_addr *dst;
452 register struct ifnet_en *ifn;
454 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
455 if (ifn->ifen_dst.s_addr == dst->s_addr &&
456 ifn->ifen_route.ro_rt != NULL) {
457 RTFREE(ifn->ifen_route.ro_rt);
458 ifn->ifen_route.ro_rt = NULL;