Annotation of src/sys/netinet6/in6_src.c, Revision 1.1.2.2
1.1.2.2 ! itojun 1: /* $NetBSD: in6_src.c,v 1.1.2.1 2000/08/27 01:11:27 itojun Exp $ */
! 2: /* $KAME: in6_src.c,v 1.34 2000/08/26 10:00:45 itojun Exp $ */
1.1 itojun 3:
4: /*
5: * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. Neither the name of the project nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: /*
34: * Copyright (c) 1982, 1986, 1991, 1993
35: * The Regents of the University of California. All rights reserved.
36: *
37: * Redistribution and use in source and binary forms, with or without
38: * modification, are permitted provided that the following conditions
39: * are met:
40: * 1. Redistributions of source code must retain the above copyright
41: * notice, this list of conditions and the following disclaimer.
42: * 2. Redistributions in binary form must reproduce the above copyright
43: * notice, this list of conditions and the following disclaimer in the
44: * documentation and/or other materials provided with the distribution.
45: * 3. All advertising materials mentioning features or use of this software
46: * must display the following acknowledgement:
47: * This product includes software developed by the University of
48: * California, Berkeley and its contributors.
49: * 4. Neither the name of the University nor the names of its contributors
50: * may be used to endorse or promote products derived from this software
51: * without specific prior written permission.
52: *
53: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
54: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
55: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
56: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
57: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
58: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
59: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
60: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
61: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
62: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
63: * SUCH DAMAGE.
64: *
65: * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
66: */
67:
68: #include "opt_inet.h"
69:
70: #include <sys/param.h>
71: #include <sys/systm.h>
72: #include <sys/malloc.h>
73: #include <sys/mbuf.h>
74: #include <sys/protosw.h>
75: #include <sys/socket.h>
76: #include <sys/socketvar.h>
77: #include <sys/ioctl.h>
78: #include <sys/errno.h>
79: #include <sys/time.h>
80: #include <sys/proc.h>
81:
82: #include <net/if.h>
83: #include <net/route.h>
84:
85: #include <netinet/in.h>
86: #include <netinet/in_var.h>
87: #include <netinet/in_systm.h>
88: #include <netinet/ip.h>
89: #include <netinet/in_pcb.h>
90: #include <netinet6/in6_var.h>
91: #include <netinet/ip6.h>
92: #include <netinet6/in6_pcb.h>
93: #include <netinet6/ip6_var.h>
94: #include <netinet6/nd6.h>
95:
96: #include <net/net_osdep.h>
97:
98: #include "loop.h"
99: extern struct ifnet loif[NLOOP];
100:
101: /*
102: * Return an IPv6 address, which is the most appropriate for given
103: * destination and user specified options.
104: * If necessary, this function lookups the routing table and return
105: * an entry to the caller for later use.
106: */
107: struct in6_addr *
108: in6_selectsrc(dstsock, opts, mopts, ro, laddr, errorp)
109: struct sockaddr_in6 *dstsock;
110: struct ip6_pktopts *opts;
111: struct ip6_moptions *mopts;
112: struct route_in6 *ro;
113: struct in6_addr *laddr;
114: int *errorp;
115: {
116: struct in6_addr *dst;
117: struct in6_ifaddr *ia6 = 0;
118: struct in6_pktinfo *pi = NULL;
119:
120: dst = &dstsock->sin6_addr;
121: *errorp = 0;
122:
123: /*
124: * If the source address is explicitly specified by the caller,
125: * use it.
126: */
127: if (opts && (pi = opts->ip6po_pktinfo) &&
128: !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr))
129: return(&pi->ipi6_addr);
130:
131: /*
132: * If the source address is not specified but the socket(if any)
133: * is already bound, use the bound address.
134: */
135: if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr))
136: return(laddr);
137:
138: /*
139: * If the caller doesn't specify the source address but
140: * the outgoing interface, use an address associated with
141: * the interface.
142: */
143: if (pi && pi->ipi6_ifindex) {
144: /* XXX boundary check is assumed to be already done. */
145: ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
146: dst);
147: if (ia6 == 0) {
148: *errorp = EADDRNOTAVAIL;
149: return(0);
150: }
151: return(&satosin6(&ia6->ia_addr)->sin6_addr);
152: }
153:
154: /*
155: * If the destination address is a link-local unicast address or
156: * a multicast address, and if the outgoing interface is specified
157: * by the sin6_scope_id filed, use an address associated with the
158: * interface.
159: * XXX: We're now trying to define more specific semantics of
160: * sin6_scope_id field, so this part will be rewritten in
161: * the near future.
162: */
163: if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
164: dstsock->sin6_scope_id) {
165: /*
166: * I'm not sure if boundary check for scope_id is done
167: * somewhere...
168: */
169: if (dstsock->sin6_scope_id < 0 ||
170: if_index < dstsock->sin6_scope_id) {
171: *errorp = ENXIO; /* XXX: better error? */
172: return(0);
173: }
174: ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
175: dst);
176: if (ia6 == 0) {
177: *errorp = EADDRNOTAVAIL;
178: return(0);
179: }
180: return(&satosin6(&ia6->ia_addr)->sin6_addr);
181: }
182:
183: /*
184: * If the destination address is a multicast address and
185: * the outgoing interface for the address is specified
186: * by the caller, use an address associated with the interface.
187: * There is a sanity check here; if the destination has node-local
188: * scope, the outgoing interfacde should be a loopback address.
189: * Even if the outgoing interface is not specified, we also
190: * choose a loopback interface as the outgoing interface.
191: */
192: if (IN6_IS_ADDR_MULTICAST(dst)) {
193: struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
194:
195: if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
196: ifp = &loif[0];
197: }
198:
199: if (ifp) {
200: ia6 = in6_ifawithscope(ifp, dst);
201: if (ia6 == 0) {
202: *errorp = EADDRNOTAVAIL;
203: return(0);
204: }
205: return(&satosin6(&ia6->ia_addr)->sin6_addr);
206: }
207: }
208:
209: /*
210: * If the next hop address for the packet is specified
211: * by caller, use an address associated with the route
212: * to the next hop.
213: */
214: {
215: struct sockaddr_in6 *sin6_next;
216: struct rtentry *rt;
217:
218: if (opts && opts->ip6po_nexthop) {
219: sin6_next = satosin6(opts->ip6po_nexthop);
220: rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
221: if (rt) {
222: ia6 = in6_ifawithscope(rt->rt_ifp, dst);
223: if (ia6 == 0)
224: ia6 = ifatoia6(rt->rt_ifa);
225: }
226: if (ia6 == 0) {
227: *errorp = EADDRNOTAVAIL;
228: return(0);
229: }
230: return(&satosin6(&ia6->ia_addr)->sin6_addr);
231: }
232: }
233:
234: /*
235: * If route is known or can be allocated now,
236: * our src addr is taken from the i/f, else punt.
237: */
238: if (ro) {
239: if (ro->ro_rt &&
240: !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
241: RTFREE(ro->ro_rt);
242: ro->ro_rt = (struct rtentry *)0;
243: }
244: if (ro->ro_rt == (struct rtentry *)0 ||
245: ro->ro_rt->rt_ifp == (struct ifnet *)0) {
246: /* No route yet, so try to acquire one */
247: bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
248: ro->ro_dst.sin6_family = AF_INET6;
249: ro->ro_dst.sin6_len = sizeof(struct sockaddr_in6);
250: ro->ro_dst.sin6_addr = *dst;
251: ro->ro_dst.sin6_scope_id = dstsock->sin6_scope_id;
252: if (IN6_IS_ADDR_MULTICAST(dst)) {
253: ro->ro_rt = rtalloc1(&((struct route *)ro)
254: ->ro_dst, 0);
255: } else {
256: rtalloc((struct route *)ro);
257: }
258: }
259:
260: /*
261: * in_pcbconnect() checks out IFF_LOOPBACK to skip using
262: * the address. But we don't know why it does so.
263: * It is necessary to ensure the scope even for lo0
264: * so doesn't check out IFF_LOOPBACK.
265: */
266:
267: if (ro->ro_rt) {
268: ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
269: if (ia6 == 0) /* xxx scope error ?*/
270: ia6 = ifatoia6(ro->ro_rt->rt_ifa);
271: }
272: #if 0
273: /*
274: * xxx The followings are necessary? (kazu)
275: * I don't think so.
276: * It's for SO_DONTROUTE option in IPv4.(jinmei)
277: */
278: if (ia6 == 0) {
279: struct sockaddr_in6 sin6 = {sizeof(sin6), AF_INET6, 0};
280:
281: sin6->sin6_addr = *dst;
282:
283: ia6 = ifatoia6(ifa_ifwithdstaddr(sin6tosa(&sin6)));
284: if (ia6 == 0)
285: ia6 = ifatoia6(ifa_ifwithnet(sin6tosa(&sin6)));
286: if (ia6 == 0)
287: return(0);
288: return(&satosin6(&ia6->ia_addr)->sin6_addr);
289: }
290: #endif /* 0 */
291: if (ia6 == 0) {
292: *errorp = EHOSTUNREACH; /* no route */
293: return(0);
294: }
295: return(&satosin6(&ia6->ia_addr)->sin6_addr);
296: }
297:
298: *errorp = EADDRNOTAVAIL;
299: return(0);
300: }
301:
302: /*
303: * Default hop limit selection. The precedence is as follows:
304: * 1. Hoplimit value specified via ioctl.
305: * 2. (If the outgoing interface is detected) the current
306: * hop limit of the interface specified by router advertisement.
307: * 3. The system default hoplimit.
308: */
309: int
310: in6_selecthlim(in6p, ifp)
311: struct in6pcb *in6p;
312: struct ifnet *ifp;
313: {
314: if (in6p && in6p->in6p_hops >= 0)
315: return(in6p->in6p_hops);
316: else if (ifp)
317: return(nd_ifinfo[ifp->if_index].chlim);
318: else
319: return(ip6_defhlim);
320: }
321:
322: /*
323: * Find an empty port and set it to the specified PCB.
324: */
325: int
326: in6_pcbsetport(laddr, in6p)
327: struct in6_addr *laddr;
328: struct in6pcb *in6p;
329: {
330: struct socket *so = in6p->in6p_socket;
331: struct in6pcb *head = in6p->in6p_head;
332: u_int16_t last_port, lport = 0;
333: int wild = 0;
334: void *t;
335: u_int16_t min, max;
336: struct proc *p = curproc; /* XXX */
337:
338: /* XXX: this is redundant when called from in6_pcbbind */
339: if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 &&
340: ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
341: (so->so_options & SO_ACCEPTCONN) == 0))
342: wild = IN6PLOOKUP_WILDCARD;
343:
344: if (in6p->in6p_flags & IN6P_LOWPORT) {
1.1.2.1 itojun 345: #ifndef IPNOPRIVPORTS
1.1 itojun 346: if (p == 0 || (suser(p->p_ucred, &p->p_acflag) != 0))
347: return (EACCES);
1.1.2.1 itojun 348: #endif
1.1.2.2 ! itojun 349: min = ip6_lowportmin;
! 350: max = ip6_lowportmax;
1.1 itojun 351: } else {
1.1.2.2 ! itojun 352: min = ip6_anonportmin;
! 353: max = ip6_anonportmax;
1.1 itojun 354: }
355:
356: /* value out of range */
357: if (head->in6p_lport < min)
358: head->in6p_lport = min;
359: else if (head->in6p_lport > max)
360: head->in6p_lport = min;
361: last_port = head->in6p_lport;
362: goto startover; /*to randomize*/
363: for (;;) {
364: lport = htons(head->in6p_lport);
365: if (IN6_IS_ADDR_V4MAPPED(laddr)) {
366: #if 0
367: t = in_pcblookup_bind(&tcbtable,
368: (struct in_addr *)&in6p->in6p_laddr.s6_addr32[3],
369: lport);
370: #else
371: t = NULL;
372: #endif
373: } else {
374: t = in6_pcblookup(head, &zeroin6_addr, 0, laddr,
375: lport, wild);
376: }
377: if (t == 0)
378: break;
379: startover:
380: if (head->in6p_lport >= max)
381: head->in6p_lport = min;
382: else
383: head->in6p_lport++;
384: if (head->in6p_lport == last_port)
385: return (EADDRINUSE);
386: }
387:
388: in6p->in6p_lport = lport;
389: return(0); /* success */
390: }
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