Annotation of src/sys/netinet6/in6_src.c, Revision 1.1
1.1 ! itojun 1: /* $NetBSD$ */
! 2: /* $KAME: in6_src.c,v 1.15 2000/05/30 10:16:24 jinmei Exp $ */
! 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) {
! 345: if (p == 0 || (suser(p->p_ucred, &p->p_acflag) != 0))
! 346: return (EACCES);
! 347: min = IPV6PORT_RESERVEDMIN;
! 348: max = IPV6PORT_RESERVEDMAX;
! 349: } else {
! 350: min = IPV6PORT_ANONMIN;
! 351: max = IPV6PORT_ANONMAX;
! 352: }
! 353:
! 354: /* value out of range */
! 355: if (head->in6p_lport < min)
! 356: head->in6p_lport = min;
! 357: else if (head->in6p_lport > max)
! 358: head->in6p_lport = min;
! 359: last_port = head->in6p_lport;
! 360: goto startover; /*to randomize*/
! 361: for (;;) {
! 362: lport = htons(head->in6p_lport);
! 363: if (IN6_IS_ADDR_V4MAPPED(laddr)) {
! 364: #if 0
! 365: t = in_pcblookup_bind(&tcbtable,
! 366: (struct in_addr *)&in6p->in6p_laddr.s6_addr32[3],
! 367: lport);
! 368: #else
! 369: t = NULL;
! 370: #endif
! 371: } else {
! 372: t = in6_pcblookup(head, &zeroin6_addr, 0, laddr,
! 373: lport, wild);
! 374: }
! 375: if (t == 0)
! 376: break;
! 377: startover:
! 378: if (head->in6p_lport >= max)
! 379: head->in6p_lport = min;
! 380: else
! 381: head->in6p_lport++;
! 382: if (head->in6p_lport == last_port)
! 383: return (EADDRINUSE);
! 384: }
! 385:
! 386: in6p->in6p_lport = lport;
! 387: return(0); /* success */
! 388: }
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