Parallelize in_ifaddrhead operation
[dragonfly.git] / sys / netproto / ipx / ipx_ip.c
CommitLineData
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1/*
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.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
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.
21 *
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
32 * SUCH DAMAGE.
33 *
34 * @(#)ipx_ip.c
35 *
36 * $FreeBSD: src/sys/netipx/ipx_ip.c,v 1.24.2.2 2003/01/23 21:06:48 sam Exp $
1b562c24 37 * $DragonFly: src/sys/netproto/ipx/ipx_ip.c,v 1.18 2008/06/08 08:38:05 sephe Exp $
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38 */
39
40/*
41 * Software interface driver for encapsulating IPX in IP.
42 */
43
44#include "opt_inet.h"
45#include "opt_ipx.h"
46
47#ifdef IPXIP
48#ifndef INET
49#error The option IPXIP requires option INET.
50#endif
51
52#include <sys/param.h>
53#include <sys/systm.h>
54#include <sys/malloc.h>
55#include <sys/mbuf.h>
56#include <sys/protosw.h>
57#include <sys/socket.h>
58#include <sys/socketvar.h>
59#include <sys/sockio.h>
60
61#include <net/if.h>
62#include <net/netisr.h>
63#include <net/route.h>
64
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>
70
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71#include "ipx.h"
72#include "ipx_if.h"
73#include "ipx_ip.h"
74#include "ipx_var.h"
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75
76static struct ifnet ipxipif;
3e4a09e7 77static int ipxipif_units;
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78
79/* list of all hosts and gateways or broadcast addrs */
80static struct ifnet_en *ipxip_list;
81
82static struct ifnet_en *ipxipattach(void);
83static int ipxip_free(struct ifnet *ifp);
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84static int ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data,
85 struct ucred *cr);
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86static int ipxipoutput(struct ifnet *ifp, struct mbuf *m,
87 struct sockaddr *dst, struct rtentry *rt);
88static void ipxip_rtchange(struct in_addr *dst);
89static void ipxipstart(struct ifnet *ifp);
90
91static struct ifnet_en *
9855a82b 92ipxipattach(void)
984263bc 93{
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94 struct ifnet_en *m;
95 struct ifnet *ifp;
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96
97 if (ipxipif.if_mtu == 0) {
98 ifp = &ipxipif;
3e4a09e7 99 if_initname(ifp, "ipxip", ipxipif_units);
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100 ifp->if_mtu = LOMTU;
101 ifp->if_ioctl = ipxipioctl;
102 ifp->if_output = ipxipoutput;
103 ifp->if_start = ipxipstart;
104 ifp->if_flags = IFF_POINTOPOINT;
105 }
106
062eab50 107 MALLOC((m), struct ifnet_en *, sizeof(*m), M_PCB, M_WAITOK | M_ZERO);
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108 m->ifen_next = ipxip_list;
109 ipxip_list = m;
110 ifp = &m->ifen_ifnet;
111
3e4a09e7 112 if_initname(ifp, "ipxip", ipxipif_units++);
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113 ifp->if_mtu = LOMTU;
114 ifp->if_ioctl = ipxipioctl;
115 ifp->if_output = ipxipoutput;
116 ifp->if_start = ipxipstart;
117 ifp->if_flags = IFF_POINTOPOINT;
78195a76 118 if_attach(ifp, NULL);
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119
120 return (m);
121}
122
123
124/*
125 * Process an ioctl request.
126 */
127static int
9974b71d 128ipxipioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr)
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129{
130 int error = 0;
131 struct ifreq *ifr;
132
133 switch (cmd) {
134
135 case SIOCSIFADDR:
136 ifp->if_flags |= IFF_UP;
137 /* fall into: */
138
139 case SIOCSIFDSTADDR:
140 /*
141 * Everything else is done at a higher level.
142 */
143 break;
144
145 case SIOCSIFFLAGS:
146 ifr = (struct ifreq *)data;
147 if ((ifr->ifr_flags & IFF_UP) == 0)
148 error = ipxip_free(ifp);
149
150
151 default:
152 error = EINVAL;
153 }
154 return (error);
155}
156
157static struct mbuf *ipxip_badlen;
158static struct mbuf *ipxip_lastin;
159static int ipxip_hold_input;
160
161void
a00138cb 162ipxip_input(struct mbuf *m, ...)
984263bc 163{
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164 struct ip *ip;
165 struct ipx *ipx;
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166 int len, s;
167
168 if (ipxip_hold_input) {
169 if (ipxip_lastin != NULL) {
170 m_freem(ipxip_lastin);
171 }
74f1caca 172 ipxip_lastin = m_copym(m, 0, (int)M_COPYALL, MB_DONTWAIT);
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173 }
174 /*
175 * Get IP and IPX header together in first mbuf.
176 */
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++;
182 return;
183 }
184 ip = mtod(m, struct ip *);
185 if (ip->ip_hl > (sizeof(struct ip) >> 2)) {
bddf0751 186 ip_stripoptions(m);
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187 if (m->m_len < s) {
188 if ((m = m_pullup(m, s)) == NULL) {
189 ipxipif.if_ierrors++;
190 return;
191 }
192 ip = mtod(m, struct ip *);
193 }
194 }
195
196 /*
197 * Make mbuf data length reflect IPX length.
198 * If not enough data to reflect IPX length, drop.
199 */
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);
205 if (len & 1)
206 len++; /* Preserve Garbage Byte */
207 if (ip->ip_len != len) {
208 if (len > ip->ip_len) {
209 ipxipif.if_ierrors++;
210 if (ipxip_badlen)
211 m_freem(ipxip_badlen);
212 ipxip_badlen = m;
213 return;
214 }
215 /* Any extra will be trimmed off by the IPX routines */
216 }
217
218 /*
219 * Deliver to IPX
220 */
8bde602d 221 netisr_dispatch(NETISR_IPX, m);
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222}
223
224static int
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225ipxipoutput_serialized(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
226 struct rtentry *rt)
984263bc 227{
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228 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
229 struct ip *ip;
230 struct route *ro = &(ifn->ifen_route);
231 int len = 0;
232 struct ipx *ipx = mtod(m, struct ipx *);
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233 int error;
234
235 ifn->ifen_ifnet.if_opackets++;
236 ipxipif.if_opackets++;
237
238 /*
239 * Calculate data length and make space
240 * for IP header.
241 */
242 len = ntohs(ipx->ipx_len);
243 if (len & 1)
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 */
74f1caca 248 struct mbuf *m0 = m_gethdr(MT_HEADER, MB_DONTWAIT);
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249 if (m0 == NULL) {
250 m_freem(m);
251 return (ENOBUFS);
252 }
253 MH_ALIGN(m0, sizeof(struct ip));
254 m0->m_flags = m->m_flags & M_COPYFLAGS;
255 m0->m_next = m;
256 m0->m_len = sizeof(struct ip);
257 m0->m_pkthdr.len = m0->m_len + m->m_len;
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258 m = m0;
259 } else {
74f1caca 260 M_PREPEND(m, sizeof(struct ip), MB_DONTWAIT);
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261 if (m == NULL)
262 return (ENOBUFS);
263 }
264 /*
265 * Fill in IP header.
266 */
267 ip = mtod(m, struct ip *);
268 *(long *)ip = 0;
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);
273 ip->ip_ttl = MAXTTL;
274
275 /*
276 * Output final datagram.
277 */
278 error = (ip_output(m, (struct mbuf *)NULL, ro, SO_BROADCAST, NULL, NULL));
279 if (error) {
280 ifn->ifen_ifnet.if_oerrors++;
281 ifn->ifen_ifnet.if_ierrors = error;
282 }
283 return (error);
284 m_freem(m);
285 return (ENETUNREACH);
286}
287
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288static int
289ipxipoutput(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst,
290 struct rtentry *rt)
291{
292 int error;
293
294 lwkt_serialize_enter(ifp->if_serializer);
295 error = ipxipoutput_serialized(ifp, m, dst, rt);
296 lwkt_serialize_exit(ifp->if_serializer);
297
298 return error;
299}
300
984263bc 301static void
9855a82b 302ipxipstart(struct ifnet *ifp)
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303{
304 panic("ipxip_start called\n");
305}
306
307static struct ifreq ifr_ipxip = {"ipxip0"};
308
309int
9855a82b 310ipxip_route(struct socket *so, struct sockopt *sopt)
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311{
312 int error;
313 struct ifnet_en *ifn;
314 struct sockaddr_in *src;
315 struct ipxip_req rq;
316 struct sockaddr_ipx *ipx_dst;
317 struct sockaddr_in *ip_dst;
318 struct route ro;
319
320 error = sooptcopyin(sopt, &rq, sizeof rq, sizeof rq);
321 if (error)
322 return (error);
323 ipx_dst = (struct sockaddr_ipx *)&rq.rq_ipx;
324 ip_dst = (struct sockaddr_in *)&rq.rq_ip;
325
326 /*
327 * First, make sure we already have an IPX address:
328 */
329 if (ipx_ifaddr == NULL)
330 return (EADDRNOTAVAIL);
331 /*
332 * Now, determine if we can get to the destination
333 */
334 bzero((caddr_t)&ro, sizeof(ro));
335 ro.ro_dst = *(struct sockaddr *)ip_dst;
336 rtalloc(&ro);
337 if (ro.ro_rt == NULL || ro.ro_rt->rt_ifp == NULL) {
338 return (ENETUNREACH);
339 }
340
341 /*
342 * And see how he's going to get back to us:
343 * i.e., what return ip address do we use?
344 */
345 {
34ee9825 346 struct in_ifaddr *ia;
1b562c24 347 struct in_ifaddr_container *iac;
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348 struct ifnet *ifp = ro.ro_rt->rt_ifp;
349
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350 ia = NULL;
351 TAILQ_FOREACH(iac, &in_ifaddrheads[mycpuid], ia_link) {
352 if (iac->ia->ia_ifp == ifp) {
353 ia = iac->ia;
984263bc 354 break;
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355 }
356 }
357 if (ia == NULL && !TAILQ_EMPTY(&in_ifaddrheads[mycpuid]))
358 ia = TAILQ_FIRST(&in_ifaddrheads[mycpuid])->ia;
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359 if (ia == NULL) {
360 RTFREE(ro.ro_rt);
361 return (EADDRNOTAVAIL);
362 }
363 src = (struct sockaddr_in *)&ia->ia_addr;
364 }
365
366 /*
367 * Is there a free (pseudo-)interface or space?
368 */
369 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
370 if ((ifn->ifen_ifnet.if_flags & IFF_UP) == 0)
371 break;
372 }
373 if (ifn == NULL)
374 ifn = ipxipattach();
375 if (ifn == NULL) {
376 RTFREE(ro.ro_rt);
377 return (ENOBUFS);
378 }
379 ifn->ifen_route = ro;
380 ifn->ifen_dst = ip_dst->sin_addr;
381 ifn->ifen_src = src->sin_addr;
382
383 /*
384 * now configure this as a point to point link
385 */
3e4a09e7 386 ifr_ipxip.ifr_name[4] = '0' + ipxipif_units - 1;
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387 ifr_ipxip.ifr_dstaddr = *(struct sockaddr *)ipx_dst;
388 ipx_control(so, (int)SIOCSIFDSTADDR, (caddr_t)&ifr_ipxip,
7b95be2a 389 (struct ifnet *)ifn, sopt->sopt_td);
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390
391 /* use any of our addresses */
392 satoipx_addr(ifr_ipxip.ifr_addr).x_host =
393 ipx_ifaddr->ia_addr.sipx_addr.x_host;
394
395 return (ipx_control(so, (int)SIOCSIFADDR, (caddr_t)&ifr_ipxip,
7b95be2a 396 (struct ifnet *)ifn, sopt->sopt_td));
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397}
398
399static int
9855a82b 400ipxip_free(struct ifnet *ifp)
984263bc 401{
34ee9825 402 struct ifnet_en *ifn = (struct ifnet_en *)ifp;
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403 struct route *ro = & ifn->ifen_route;
404
405 if (ro->ro_rt != NULL) {
406 RTFREE(ro->ro_rt);
407 ro->ro_rt = NULL;
408 }
409 ifp->if_flags &= ~IFF_UP;
410 return (0);
411}
412
413void
9855a82b 414ipxip_ctlinput(int cmd, struct sockaddr *sa, void *dummy)
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415{
416 struct sockaddr_in *sin;
417
418 if ((unsigned)cmd >= PRC_NCMDS)
419 return;
420 if (sa->sa_family != AF_INET && sa->sa_family != AF_IMPLINK)
421 return;
422 sin = (struct sockaddr_in *)sa;
423 if (sin->sin_addr.s_addr == INADDR_ANY)
424 return;
425
426 switch (cmd) {
427
428 case PRC_ROUTEDEAD:
429 case PRC_REDIRECT_NET:
430 case PRC_REDIRECT_HOST:
431 case PRC_REDIRECT_TOSNET:
432 case PRC_REDIRECT_TOSHOST:
433 ipxip_rtchange(&sin->sin_addr);
434 break;
435 }
436}
437
438static void
9855a82b 439ipxip_rtchange(struct in_addr *dst)
984263bc 440{
34ee9825 441 struct ifnet_en *ifn;
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442
443 for (ifn = ipxip_list; ifn != NULL; ifn = ifn->ifen_next) {
444 if (ifn->ifen_dst.s_addr == dst->s_addr &&
445 ifn->ifen_route.ro_rt != NULL) {
446 RTFREE(ifn->ifen_route.ro_rt);
447 ifn->ifen_route.ro_rt = NULL;
448 }
449 }
450}
451#endif /* IPXIP */