FreeBSD/Linux Kernel Cross Reference
sys/netipx/ipx_pcb.c
1 /*-
2 * Copyright (c) 1984, 1985, 1986, 1987, 1993
3 * The Regents of the University of California.
4 * Copyright (c) 2004-2006 Robert N. M. Watson
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * Copyright (c) 1995, Mike Mitchell
32 * All rights reserved.
33 *
34 * Redistribution and use in source and binary forms, with or without
35 * modification, are permitted provided that the following conditions
36 * are met:
37 * 1. Redistributions of source code must retain the above copyright
38 * notice, this list of conditions and the following disclaimer.
39 * 2. Redistributions in binary form must reproduce the above copyright
40 * notice, this list of conditions and the following disclaimer in the
41 * documentation and/or other materials provided with the distribution.
42 * 3. All advertising materials mentioning features or use of this software
43 * must display the following acknowledgement:
44 * This product includes software developed by the University of
45 * California, Berkeley and its contributors.
46 * 4. Neither the name of the University nor the names of its contributors
47 * may be used to endorse or promote products derived from this software
48 * without specific prior written permission.
49 *
50 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
51 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
52 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
53 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
54 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
55 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
56 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
57 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
58 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
59 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
60 * SUCH DAMAGE.
61 *
62 * @(#)ipx_pcb.c
63 */
64
65 #include <sys/cdefs.h>
66 __FBSDID("$FreeBSD: src/sys/netipx/ipx_pcb.c,v 1.50 2008/10/23 15:53:51 des Exp $");
67
68 #include <sys/param.h>
69 #include <sys/systm.h>
70 #include <sys/malloc.h>
71 #include <sys/priv.h>
72 #include <sys/socket.h>
73 #include <sys/socketvar.h>
74
75 #include <net/if.h>
76 #include <net/route.h>
77
78 #include <netipx/ipx.h>
79 #include <netipx/ipx_if.h>
80 #include <netipx/ipx_pcb.h>
81 #include <netipx/ipx_var.h>
82
83 static struct ipx_addr zeroipx_addr;
84 static u_short ipxpcb_lport_cache;
85
86 int
87 ipx_pcballoc(struct socket *so, struct ipxpcbhead *head, struct thread *td)
88 {
89 struct ipxpcb *ipxp;
90
91 KASSERT(so->so_pcb == NULL, ("ipx_pcballoc: so_pcb != NULL"));
92 IPX_LIST_LOCK_ASSERT();
93
94 ipxp = malloc(sizeof *ipxp, M_PCB, M_NOWAIT | M_ZERO);
95 if (ipxp == NULL)
96 return (ENOBUFS);
97 IPX_LOCK_INIT(ipxp);
98 ipxp->ipxp_socket = so;
99 if (ipxcksum)
100 ipxp->ipxp_flags |= IPXP_CHECKSUM;
101 LIST_INSERT_HEAD(head, ipxp, ipxp_list);
102 so->so_pcb = (caddr_t)ipxp;
103 return (0);
104 }
105
106 int
107 ipx_pcbbind(struct ipxpcb *ipxp, struct sockaddr *nam, struct thread *td)
108 {
109 struct sockaddr_ipx *sipx;
110 u_short lport = 0;
111
112 IPX_LIST_LOCK_ASSERT();
113 IPX_LOCK_ASSERT(ipxp);
114
115 if (ipxp->ipxp_lport || !ipx_nullhost(ipxp->ipxp_laddr))
116 return (EINVAL);
117 if (nam == NULL)
118 goto noname;
119 sipx = (struct sockaddr_ipx *)nam;
120 if (!ipx_nullhost(sipx->sipx_addr)) {
121 int tport = sipx->sipx_port;
122
123 sipx->sipx_port = 0; /* yech... */
124 if (ifa_ifwithaddr((struct sockaddr *)sipx) == NULL)
125 return (EADDRNOTAVAIL);
126 sipx->sipx_port = tport;
127 }
128 lport = sipx->sipx_port;
129 if (lport) {
130 u_short aport = ntohs(lport);
131
132 if (aport < IPXPORT_RESERVED && td != NULL &&
133 priv_check(td, PRIV_NETIPX_RESERVEDPORT))
134 return (EACCES);
135 if (ipx_pcblookup(&zeroipx_addr, lport, 0))
136 return (EADDRINUSE);
137 }
138 ipxp->ipxp_laddr = sipx->sipx_addr;
139 noname:
140 if (lport == 0)
141 do {
142 ipxpcb_lport_cache++;
143 if ((ipxpcb_lport_cache < IPXPORT_RESERVED) ||
144 (ipxpcb_lport_cache >= IPXPORT_WELLKNOWN))
145 ipxpcb_lport_cache = IPXPORT_RESERVED;
146 lport = htons(ipxpcb_lport_cache);
147 } while (ipx_pcblookup(&zeroipx_addr, lport, 0));
148 ipxp->ipxp_lport = lport;
149 return (0);
150 }
151
152 /*
153 * Connect from a socket to a specified address.
154 * Both address and port must be specified in argument sipx.
155 * If don't have a local address for this socket yet,
156 * then pick one.
157 */
158 int
159 ipx_pcbconnect(struct ipxpcb *ipxp, struct sockaddr *nam, struct thread *td)
160 {
161 struct ipx_ifaddr *ia;
162 struct sockaddr_ipx *sipx = (struct sockaddr_ipx *)nam;
163 struct ipx_addr *dst;
164 struct route *ro;
165 struct ifnet *ifp;
166
167 IPX_LIST_LOCK_ASSERT();
168 IPX_LOCK_ASSERT(ipxp);
169
170 ia = NULL;
171
172 if (sipx->sipx_family != AF_IPX)
173 return (EAFNOSUPPORT);
174 if (sipx->sipx_port == 0 || ipx_nullhost(sipx->sipx_addr))
175 return (EADDRNOTAVAIL);
176 /*
177 * If we haven't bound which network number to use as ours,
178 * we will use the number of the outgoing interface.
179 * This depends on having done a routing lookup, which
180 * we will probably have to do anyway, so we might
181 * as well do it now. On the other hand if we are
182 * sending to multiple destinations we may have already
183 * done the lookup, so see if we can use the route
184 * from before. In any case, we only
185 * chose a port number once, even if sending to multiple
186 * destinations.
187 */
188 ro = &ipxp->ipxp_route;
189 dst = &satoipx_addr(ro->ro_dst);
190 if (ipxp->ipxp_socket->so_options & SO_DONTROUTE)
191 goto flush;
192 if (!ipx_neteq(ipxp->ipxp_lastdst, sipx->sipx_addr))
193 goto flush;
194 if (!ipx_hosteq(ipxp->ipxp_lastdst, sipx->sipx_addr)) {
195 if (ro->ro_rt != NULL && !(ro->ro_rt->rt_flags & RTF_HOST)) {
196 /* can patch route to avoid rtalloc */
197 *dst = sipx->sipx_addr;
198 } else {
199 flush:
200 if (ro->ro_rt != NULL)
201 RTFREE(ro->ro_rt);
202 ro->ro_rt = NULL;
203 }
204 }/* else cached route is ok; do nothing */
205 ipxp->ipxp_lastdst = sipx->sipx_addr;
206 if ((ipxp->ipxp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
207 (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL)) {
208 /* No route yet, so try to acquire one */
209 ro->ro_dst.sa_family = AF_IPX;
210 ro->ro_dst.sa_len = sizeof(ro->ro_dst);
211 *dst = sipx->sipx_addr;
212 dst->x_port = 0;
213 rtalloc_ign(ro, 0);
214 }
215 if (ipx_neteqnn(ipxp->ipxp_laddr.x_net, ipx_zeronet)) {
216 /*
217 * If route is known or can be allocated now,
218 * our src addr is taken from the i/f, else punt.
219 */
220
221 /*
222 * If we found a route, use the address
223 * corresponding to the outgoing interface
224 */
225 if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL)
226 for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
227 if (ia->ia_ifp == ifp)
228 break;
229 if (ia == NULL) {
230 u_short fport = sipx->sipx_addr.x_port;
231 sipx->sipx_addr.x_port = 0;
232 ia = (struct ipx_ifaddr *)
233 ifa_ifwithdstaddr((struct sockaddr *)sipx);
234 sipx->sipx_addr.x_port = fport;
235 if (ia == NULL)
236 ia = ipx_iaonnetof(&sipx->sipx_addr);
237 if (ia == NULL)
238 ia = ipx_ifaddr;
239 if (ia == NULL)
240 return (EADDRNOTAVAIL);
241 }
242 ipxp->ipxp_laddr.x_net = satoipx_addr(ia->ia_addr).x_net;
243 }
244 if (ipx_nullhost(ipxp->ipxp_laddr)) {
245 /*
246 * If route is known or can be allocated now,
247 * our src addr is taken from the i/f, else punt.
248 */
249
250 /*
251 * If we found a route, use the address
252 * corresponding to the outgoing interface
253 */
254 if (ro->ro_rt != NULL && (ifp = ro->ro_rt->rt_ifp) != NULL)
255 for (ia = ipx_ifaddr; ia != NULL; ia = ia->ia_next)
256 if (ia->ia_ifp == ifp)
257 break;
258 if (ia == NULL) {
259 u_short fport = sipx->sipx_addr.x_port;
260 sipx->sipx_addr.x_port = 0;
261 ia = (struct ipx_ifaddr *)
262 ifa_ifwithdstaddr((struct sockaddr *)sipx);
263 sipx->sipx_addr.x_port = fport;
264 if (ia == NULL)
265 ia = ipx_iaonnetof(&sipx->sipx_addr);
266 if (ia == NULL)
267 ia = ipx_ifaddr;
268 if (ia == NULL)
269 return (EADDRNOTAVAIL);
270 }
271 ipxp->ipxp_laddr.x_host = satoipx_addr(ia->ia_addr).x_host;
272 }
273 if (ipx_pcblookup(&sipx->sipx_addr, ipxp->ipxp_lport, 0))
274 return (EADDRINUSE);
275 if (ipxp->ipxp_lport == 0)
276 ipx_pcbbind(ipxp, (struct sockaddr *)NULL, td);
277
278 /* XXX just leave it zero if we can't find a route */
279
280 ipxp->ipxp_faddr = sipx->sipx_addr;
281 /* Includes ipxp->ipxp_fport = sipx->sipx_port; */
282 return (0);
283 }
284
285 void
286 ipx_pcbdisconnect(struct ipxpcb *ipxp)
287 {
288
289 IPX_LIST_LOCK_ASSERT();
290 IPX_LOCK_ASSERT(ipxp);
291
292 ipxp->ipxp_faddr = zeroipx_addr;
293 }
294
295 void
296 ipx_pcbdetach(struct ipxpcb *ipxp)
297 {
298 struct socket *so = ipxp->ipxp_socket;
299
300 IPX_LIST_LOCK_ASSERT();
301 IPX_LOCK_ASSERT(ipxp);
302
303 so->so_pcb = NULL;
304 ipxp->ipxp_socket = NULL;
305 }
306
307 void
308 ipx_pcbfree(struct ipxpcb *ipxp)
309 {
310
311 KASSERT(ipxp->ipxp_socket == NULL,
312 ("ipx_pcbfree: ipxp_socket != NULL"));
313 IPX_LIST_LOCK_ASSERT();
314 IPX_LOCK_ASSERT(ipxp);
315
316 if (ipxp->ipxp_route.ro_rt != NULL)
317 RTFREE(ipxp->ipxp_route.ro_rt);
318 LIST_REMOVE(ipxp, ipxp_list);
319 IPX_LOCK_DESTROY(ipxp);
320 free(ipxp, M_PCB);
321 }
322
323 void
324 ipx_getsockaddr(struct ipxpcb *ipxp, struct sockaddr **nam)
325 {
326 struct sockaddr_ipx *sipx, ssipx;
327
328 sipx = &ssipx;
329 bzero((caddr_t)sipx, sizeof(*sipx));
330 sipx->sipx_len = sizeof(*sipx);
331 sipx->sipx_family = AF_IPX;
332 IPX_LOCK(ipxp);
333 sipx->sipx_addr = ipxp->ipxp_laddr;
334 IPX_UNLOCK(ipxp);
335 *nam = sodupsockaddr((struct sockaddr *)sipx, M_WAITOK);
336 }
337
338 void
339 ipx_getpeeraddr(struct ipxpcb *ipxp, struct sockaddr **nam)
340 {
341 struct sockaddr_ipx *sipx, ssipx;
342
343 sipx = &ssipx;
344 bzero(sipx, sizeof(*sipx));
345 sipx->sipx_len = sizeof(*sipx);
346 sipx->sipx_family = AF_IPX;
347 IPX_LOCK(ipxp);
348 sipx->sipx_addr = ipxp->ipxp_faddr;
349 IPX_UNLOCK(ipxp);
350 *nam = sodupsockaddr((struct sockaddr *)sipx, M_WAITOK);
351 }
352
353 struct ipxpcb *
354 ipx_pcblookup(struct ipx_addr *faddr, u_short lport, int wildp)
355 {
356 struct ipxpcb *ipxp, *match = NULL;
357 int matchwild = 3, wildcard;
358 u_short fport;
359
360 IPX_LIST_LOCK_ASSERT();
361
362 fport = faddr->x_port;
363 LIST_FOREACH(ipxp, &ipxpcb_list, ipxp_list) {
364 if (ipxp->ipxp_lport != lport)
365 continue;
366 wildcard = 0;
367 if (ipx_nullhost(ipxp->ipxp_faddr)) {
368 if (!ipx_nullhost(*faddr))
369 wildcard++;
370 } else {
371 if (ipx_nullhost(*faddr))
372 wildcard++;
373 else {
374 if (!ipx_hosteq(ipxp->ipxp_faddr, *faddr))
375 continue;
376 if (ipxp->ipxp_fport != fport) {
377 if (ipxp->ipxp_fport != 0)
378 continue;
379 else
380 wildcard++;
381 }
382 }
383 }
384 if (wildcard && wildp == 0)
385 continue;
386 if (wildcard < matchwild) {
387 match = ipxp;
388 matchwild = wildcard;
389 if (wildcard == 0)
390 break;
391 }
392 }
393 return (match);
394 }
395
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