1 /* $FreeBSD: src/sys/netinet6/in6_pcb.c,v 1.10.2.9 2003/01/24 05:11:35 sam Exp $ */
2 /* $DragonFly: src/sys/netinet6/in6_pcb.c,v 1.17 2004/06/07 07:02:42 dillon Exp $ */
3 /* $KAME: in6_pcb.c,v 1.31 2001/05/21 05:45:10 jinmei Exp $ */
6 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
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16 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the project nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
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37 * The Regents of the University of California. All rights reserved.
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40 * modification, are permitted provided that the following conditions
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57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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67 * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94
71 #include "opt_inet6.h"
72 #include "opt_ipsec.h"
74 #include <sys/param.h>
75 #include <sys/systm.h>
76 #include <sys/malloc.h>
78 #include <sys/domain.h>
79 #include <sys/protosw.h>
80 #include <sys/socket.h>
81 #include <sys/socketvar.h>
82 #include <sys/sockio.h>
83 #include <sys/errno.h>
88 #include <vm/vm_zone.h>
91 #include <net/if_types.h>
92 #include <net/route.h>
94 #include <netinet/in.h>
95 #include <netinet/in_var.h>
96 #include <netinet/in_systm.h>
97 #include <netinet/ip6.h>
98 #include <netinet/ip_var.h>
99 #include <netinet6/ip6_var.h>
100 #include <netinet6/nd6.h>
101 #include <netinet/in_pcb.h>
102 #include <netinet6/in6_pcb.h>
105 #include <netinet6/ipsec.h>
107 #include <netinet6/ipsec6.h>
109 #include <netinet6/ah.h>
111 #include <netinet6/ah6.h>
113 #include <netproto/key/key.h>
119 #include <netipsec/key.h>
121 #endif /* FAST_IPSEC */
123 struct in6_addr zeroin6_addr;
126 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
128 struct socket *so = inp->inp_socket;
129 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)NULL;
130 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
132 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
134 if (!in6_ifaddr) /* XXX broken! */
135 return (EADDRNOTAVAIL);
136 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
138 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
141 sin6 = (struct sockaddr_in6 *)nam;
142 if (nam->sa_len != sizeof(*sin6))
147 if (nam->sa_family != AF_INET6)
148 return(EAFNOSUPPORT);
150 /* KAME hack: embed scopeid */
151 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
153 /* this must be cleared for ifa_ifwithaddr() */
154 sin6->sin6_scope_id = 0;
156 lport = sin6->sin6_port;
157 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
159 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
160 * allow compepte duplication of binding if
161 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
162 * and a multicast address is bound on both
163 * new and duplicated sockets.
165 if (so->so_options & SO_REUSEADDR)
166 reuseport = SO_REUSEADDR|SO_REUSEPORT;
167 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
168 struct ifaddr *ia = NULL;
170 sin6->sin6_port = 0; /* yech... */
171 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
172 return(EADDRNOTAVAIL);
175 * XXX: bind to an anycast address might accidentally
176 * cause sending a packet with anycast source address.
177 * We should allow to bind to a deprecated address, since
178 * the application dare to use it.
181 ((struct in6_ifaddr *)ia)->ia6_flags &
182 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
183 return(EADDRNOTAVAIL);
188 struct proc *p = td->td_proc; /* may be NULL */
191 if (ntohs(lport) < IPV6PORT_RESERVED && p &&
192 suser_cred(p->p_ucred, PRISON_ROOT))
194 if (so->so_cred->cr_uid != 0 &&
195 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
196 t = in6_pcblookup_local(pcbinfo,
197 &sin6->sin6_addr, lport,
200 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
201 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
202 (t->inp_socket->so_options &
203 SO_REUSEPORT) == 0) &&
204 (so->so_cred->cr_uid !=
205 t->inp_socket->so_cred->cr_uid))
207 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
208 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
209 struct sockaddr_in sin;
211 in6_sin6_2_sin(&sin, sin6);
212 t = in_pcblookup_local(pcbinfo,
216 (so->so_cred->cr_uid !=
217 t->inp_socket->so_cred->cr_uid) &&
218 (ntohl(t->inp_laddr.s_addr) !=
221 INP_SOCKAF(t->inp_socket)))
225 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
227 if (t && (reuseport & t->inp_socket->so_options) == 0)
229 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
230 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
231 struct sockaddr_in sin;
233 in6_sin6_2_sin(&sin, sin6);
234 t = in_pcblookup_local(pcbinfo, sin.sin_addr,
237 (reuseport & t->inp_socket->so_options)
239 (ntohl(t->inp_laddr.s_addr)
242 INP_SOCKAF(t->inp_socket)))
246 inp->in6p_laddr = sin6->sin6_addr;
250 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0)
254 inp->inp_lport = lport;
255 if (in_pcbinsporthash(inp) != 0) {
256 inp->in6p_laddr = in6addr_any;
265 * Transform old in6_pcbconnect() into an inner subroutine for new
266 * in6_pcbconnect(): Do some validity-checking on the remote
267 * address (in mbuf 'nam') and then determine local host address
268 * (i.e., which interface) to use to access that remote host.
270 * This preserves definition of in6_pcbconnect(), while supporting a
271 * slightly different version for T/TCP. (This is more than
272 * a bit of a kludge, but cleaning up the internal interfaces would
273 * have forced minor changes in every protocol).
277 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
278 struct in6_addr **plocal_addr6)
280 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
281 struct ifnet *ifp = NULL;
284 if (nam->sa_len != sizeof (*sin6))
286 if (sin6->sin6_family != AF_INET6)
287 return (EAFNOSUPPORT);
288 if (sin6->sin6_port == 0)
289 return (EADDRNOTAVAIL);
291 /* KAME hack: embed scopeid */
292 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
297 * If the destination address is UNSPECIFIED addr,
298 * use the loopback addr, e.g ::1.
300 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
301 sin6->sin6_addr = in6addr_loopback;
305 * XXX: in6_selectsrc might replace the bound local address
306 * with the address specified by setsockopt(IPV6_PKTINFO).
307 * Is it the intended behavior?
309 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
312 &inp->in6p_laddr, &error);
313 if (*plocal_addr6 == 0) {
315 error = EADDRNOTAVAIL;
319 * Don't do pcblookup call here; return interface in
321 * and exit to caller, that will do the lookup.
325 if (inp->in6p_route.ro_rt)
326 ifp = inp->in6p_route.ro_rt->rt_ifp;
333 * Connect from a socket to a specified address.
334 * Both address and port must be specified in argument sin.
335 * If don't have a local address for this socket yet,
339 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
341 struct in6_addr *addr6;
342 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
346 * Call inner routine, to assign local interface address.
347 * in6_pcbladdr() may automatically fill in sin6_scope_id.
349 if ((error = in6_pcbladdr(inp, nam, &addr6)) != 0)
352 if (in6_pcblookup_hash(inp->inp_cpcbinfo, &sin6->sin6_addr,
354 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
355 ? addr6 : &inp->in6p_laddr,
356 inp->inp_lport, 0, NULL) != NULL) {
359 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
360 if (inp->inp_lport == 0) {
361 error = in6_pcbbind(inp, (struct sockaddr *)0, td);
365 inp->in6p_laddr = *addr6;
367 inp->in6p_faddr = sin6->sin6_addr;
368 inp->inp_fport = sin6->sin6_port;
369 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
370 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
371 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
372 inp->in6p_flowinfo |=
373 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
375 in_pcbinsconnhash(inp);
381 * Return an IPv6 address, which is the most appropriate for given
382 * destination and user specified options.
383 * If necessary, this function lookups the routing table and return
384 * an entry to the caller for later use.
387 in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
388 struct ip6_moptions *mopts, struct route_in6 *ro,
389 struct in6_addr *laddr, int *errorp)
391 struct in6_addr *dst;
392 struct in6_ifaddr *ia6 = 0;
393 struct in6_pktinfo *pi = NULL;
395 dst = &dstsock->sin6_addr;
399 * If the source address is explicitly specified by the caller,
402 if (opts && (pi = opts->ip6po_pktinfo) &&
403 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr))
404 return(&pi->ipi6_addr);
407 * If the source address is not specified but the socket(if any)
408 * is already bound, use the bound address.
410 if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr))
414 * If the caller doesn't specify the source address but
415 * the outgoing interface, use an address associated with
418 if (pi && pi->ipi6_ifindex) {
419 /* XXX boundary check is assumed to be already done. */
420 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
423 *errorp = EADDRNOTAVAIL;
426 return(&satosin6(&ia6->ia_addr)->sin6_addr);
430 * If the destination address is a link-local unicast address or
431 * a multicast address, and if the outgoing interface is specified
432 * by the sin6_scope_id filed, use an address associated with the
434 * XXX: We're now trying to define more specific semantics of
435 * sin6_scope_id field, so this part will be rewritten in
438 if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
439 dstsock->sin6_scope_id) {
441 * I'm not sure if boundary check for scope_id is done
444 if (dstsock->sin6_scope_id < 0 ||
445 if_index < dstsock->sin6_scope_id) {
446 *errorp = ENXIO; /* XXX: better error? */
449 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
452 *errorp = EADDRNOTAVAIL;
455 return(&satosin6(&ia6->ia_addr)->sin6_addr);
459 * If the destination address is a multicast address and
460 * the outgoing interface for the address is specified
461 * by the caller, use an address associated with the interface.
462 * There is a sanity check here; if the destination has node-local
463 * scope, the outgoing interfacde should be a loopback address.
464 * Even if the outgoing interface is not specified, we also
465 * choose a loopback interface as the outgoing interface.
467 if (IN6_IS_ADDR_MULTICAST(dst)) {
468 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
470 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
475 ia6 = in6_ifawithscope(ifp, dst);
477 *errorp = EADDRNOTAVAIL;
480 return(&ia6->ia_addr.sin6_addr);
485 * If the next hop address for the packet is specified
486 * by caller, use an address associated with the route
490 struct sockaddr_in6 *sin6_next;
493 if (opts && opts->ip6po_nexthop) {
494 sin6_next = satosin6(opts->ip6po_nexthop);
495 rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
497 ia6 = in6_ifawithscope(rt->rt_ifp, dst);
499 ia6 = ifatoia6(rt->rt_ifa);
502 *errorp = EADDRNOTAVAIL;
505 return(&satosin6(&ia6->ia_addr)->sin6_addr);
510 * If route is known or can be allocated now,
511 * our src addr is taken from the i/f, else punt.
515 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
517 ro->ro_rt = (struct rtentry *)0;
519 if (ro->ro_rt == (struct rtentry *)0 ||
520 ro->ro_rt->rt_ifp == (struct ifnet *)0) {
521 struct sockaddr_in6 *dst6;
523 /* No route yet, so try to acquire one */
524 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
525 dst6 = (struct sockaddr_in6 *)&ro->ro_dst;
526 dst6->sin6_family = AF_INET6;
527 dst6->sin6_len = sizeof(struct sockaddr_in6);
528 dst6->sin6_addr = *dst;
529 if (IN6_IS_ADDR_MULTICAST(dst)) {
530 ro->ro_rt = rtalloc1(&((struct route *)ro)
533 rtalloc((struct route *)ro);
538 * in_pcbconnect() checks out IFF_LOOPBACK to skip using
539 * the address. But we don't know why it does so.
540 * It is necessary to ensure the scope even for lo0
541 * so doesn't check out IFF_LOOPBACK.
545 ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
546 if (ia6 == 0) /* xxx scope error ?*/
547 ia6 = ifatoia6(ro->ro_rt->rt_ifa);
550 *errorp = EHOSTUNREACH; /* no route */
553 return(&satosin6(&ia6->ia_addr)->sin6_addr);
556 *errorp = EADDRNOTAVAIL;
561 * Default hop limit selection. The precedence is as follows:
562 * 1. Hoplimit valued specified via ioctl.
563 * 2. (If the outgoing interface is detected) the current
564 * hop limit of the interface specified by router advertisement.
565 * 3. The system default hoplimit.
568 in6_selecthlim(struct in6pcb *in6p, struct ifnet *ifp)
570 if (in6p && in6p->in6p_hops >= 0)
571 return(in6p->in6p_hops);
573 return(nd_ifinfo[ifp->if_index].chlim);
580 in6_pcbdisconnect(struct inpcb *inp)
582 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
584 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
585 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
586 in_pcbremconnhash(inp);
587 if (inp->inp_socket->so_state & SS_NOFDREF)
592 in6_pcbdetach(struct inpcb *inp)
594 struct socket *so = inp->inp_socket;
595 struct inpcbinfo *ipi = inp->inp_pcbinfo;
598 if (inp->in6p_sp != NULL)
599 ipsec6_delete_pcbpolicy(inp);
601 inp->inp_gencnt = ++ipi->ipi_gencnt;
606 if (inp->in6p_options)
607 m_freem(inp->in6p_options);
608 ip6_freepcbopts(inp->in6p_outputopts);
609 ip6_freemoptions(inp->in6p_moptions);
610 if (inp->in6p_route.ro_rt)
611 rtfree(inp->in6p_route.ro_rt);
612 /* Check and free IPv4 related resources in case of mapped addr */
613 if (inp->inp_options)
614 (void)m_free(inp->inp_options);
615 ip_freemoptions(inp->inp_moptions);
618 zfree(ipi->ipi_zone, inp);
622 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
623 * modified to match the pru_sockaddr() and pru_peeraddr() entry points
624 * in struct pr_usrreqs, so that protocols can just reference then directly
625 * without the need for a wrapper function. The socket must have a valid
626 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
627 * except through a kernel programming error, so it is acceptable to panic
628 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap
629 * because there actually /is/ a programming error somewhere... XXX)
632 in6_setsockaddr(struct socket *so, struct sockaddr **nam)
636 struct sockaddr_in6 *sin6;
639 * Do the malloc first in case it blocks.
641 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME, M_WAITOK);
642 bzero(sin6, sizeof *sin6);
643 sin6->sin6_family = AF_INET6;
644 sin6->sin6_len = sizeof(*sin6);
650 free(sin6, M_SONAME);
653 sin6->sin6_port = inp->inp_lport;
654 sin6->sin6_addr = inp->in6p_laddr;
656 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
657 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
659 sin6->sin6_scope_id = 0; /*XXX*/
660 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
661 sin6->sin6_addr.s6_addr16[1] = 0;
663 *nam = (struct sockaddr *)sin6;
668 in6_setpeeraddr(struct socket *so, struct sockaddr **nam)
672 struct sockaddr_in6 *sin6;
675 * Do the malloc first in case it blocks.
677 MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME, M_WAITOK);
678 bzero((caddr_t)sin6, sizeof (*sin6));
679 sin6->sin6_family = AF_INET6;
680 sin6->sin6_len = sizeof(struct sockaddr_in6);
686 free(sin6, M_SONAME);
689 sin6->sin6_port = inp->inp_fport;
690 sin6->sin6_addr = inp->in6p_faddr;
692 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
693 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
695 sin6->sin6_scope_id = 0; /*XXX*/
696 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
697 sin6->sin6_addr.s6_addr16[1] = 0;
699 *nam = (struct sockaddr *)sin6;
704 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
706 struct inpcb *inp = sotoinpcb(so);
711 if (inp->inp_vflag & INP_IPV4) {
712 error = in_setsockaddr(so, nam);
714 in6_sin_2_v4mapsin6_in_sock(nam);
716 /* scope issues will be handled in in6_setsockaddr(). */
717 error = in6_setsockaddr(so, nam);
723 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
725 struct inpcb *inp = sotoinpcb(so);
730 if (inp->inp_vflag & INP_IPV4) {
731 error = in_setpeeraddr(so, nam);
733 in6_sin_2_v4mapsin6_in_sock(nam);
735 /* scope issues will be handled in in6_setpeeraddr(). */
736 error = in6_setpeeraddr(so, nam);
742 * Pass some notification to all connections of a protocol
743 * associated with address dst. The local address and/or port numbers
744 * may be specified to limit the search. The "usual action" will be
745 * taken, depending on the ctlinput cmd. The caller must filter any
746 * cmds that are uninteresting (e.g., no error in the map).
747 * Call the protocol specific routine (if any) to report
748 * any errors for each matching socket.
750 * Must be called at splnet.
753 in6_pcbnotify(struct inpcbhead *head, struct sockaddr *dst, u_int fport_arg,
754 const struct sockaddr *src, u_int lport_arg, int cmd,
755 void (*notify) (struct inpcb *, int))
757 struct inpcb *inp, *ninp;
758 struct sockaddr_in6 sa6_src, *sa6_dst;
759 u_short fport = fport_arg, lport = lport_arg;
763 if ((unsigned)cmd > PRC_NCMDS || dst->sa_family != AF_INET6)
766 sa6_dst = (struct sockaddr_in6 *)dst;
767 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
771 * note that src can be NULL when we get notify by local fragmentation.
773 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
774 flowinfo = sa6_src.sin6_flowinfo;
777 * Redirects go to all references to the destination,
778 * and use in6_rtchange to invalidate the route cache.
779 * Dead host indications: also use in6_rtchange to invalidate
780 * the cache, and deliver the error to all the sockets.
781 * Otherwise, if we have knowledge of the local port and address,
782 * deliver only to that socket.
784 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
787 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
789 if (cmd != PRC_HOSTDEAD)
790 notify = in6_rtchange;
792 errno = inet6ctlerrmap[cmd];
794 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
795 ninp = LIST_NEXT(inp, inp_list);
797 if (inp->inp_flags & INP_PLACEMARKER)
800 if ((inp->inp_vflag & INP_IPV6) == 0)
804 * Detect if we should notify the error. If no source and
805 * destination ports are specifed, but non-zero flowinfo and
806 * local address match, notify the error. This is the case
807 * when the error is delivered with an encrypted buffer
808 * by ESP. Otherwise, just compare addresses and ports
811 if (lport == 0 && fport == 0 && flowinfo &&
812 inp->inp_socket != NULL &&
813 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
814 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
816 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
817 &sa6_dst->sin6_addr) ||
818 inp->inp_socket == 0 ||
819 (lport && inp->inp_lport != lport) ||
820 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
821 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
822 &sa6_src.sin6_addr)) ||
823 (fport && inp->inp_fport != fport))
828 (*notify)(inp, errno);
834 * Lookup a PCB based on the local address and port.
837 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
838 u_int lport_arg, int wild_okay)
841 int matchwild = 3, wildcard;
842 u_short lport = lport_arg;
843 struct inpcbporthead *porthash;
844 struct inpcbport *phd;
845 struct inpcb *match = NULL;
848 * Best fit PCB lookup.
850 * First see if this local port is in use by looking on the
853 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
854 pcbinfo->porthashmask)];
855 LIST_FOREACH(phd, porthash, phd_hash) {
856 if (phd->phd_port == lport)
861 * Port is in use by one or more PCBs. Look for best
864 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
866 if ((inp->inp_vflag & INP_IPV6) == 0)
868 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
870 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
871 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
873 else if (!IN6_ARE_ADDR_EQUAL(
874 &inp->in6p_laddr, laddr))
877 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
880 if (wildcard && !wild_okay)
882 if (wildcard < matchwild) {
887 matchwild = wildcard;
895 in6_pcbpurgeif0(struct in6pcb *head, struct ifnet *ifp)
898 struct ip6_moptions *im6o;
899 struct in6_multi_mship *imm, *nimm;
901 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
902 if (in6p->in6p_flags & INP_PLACEMARKER)
904 im6o = in6p->in6p_moptions;
905 if ((in6p->inp_vflag & INP_IPV6) &&
908 * Unselect the outgoing interface if it is being
911 if (im6o->im6o_multicast_ifp == ifp)
912 im6o->im6o_multicast_ifp = NULL;
915 * Drop multicast group membership if we joined
916 * through the interface being detached.
917 * XXX controversial - is it really legal for kernel
920 for (imm = im6o->im6o_memberships.lh_first;
921 imm != NULL; imm = nimm) {
922 nimm = imm->i6mm_chain.le_next;
923 if (imm->i6mm_maddr->in6m_ifp == ifp) {
924 LIST_REMOVE(imm, i6mm_chain);
925 in6_delmulti(imm->i6mm_maddr);
926 free(imm, M_IPMADDR);
934 * Check for alternatives when higher level complains
935 * about service problems. For now, invalidate cached
936 * routing information. If the route was created dynamically
937 * (by a redirect), time to try a default gateway again.
940 in6_losing(struct inpcb *in6p)
943 struct rt_addrinfo info;
945 if ((rt = in6p->in6p_route.ro_rt) != NULL) {
946 bzero((caddr_t)&info, sizeof(info));
947 info.rti_flags = rt->rt_flags;
948 info.rti_info[RTAX_DST] = rt_key(rt);
949 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
950 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
951 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
952 if (rt->rt_flags & RTF_DYNAMIC)
953 (void)rtrequest1(RTM_DELETE, &info, NULL);
954 in6p->in6p_route.ro_rt = NULL;
957 * A new route can be allocated
958 * the next time output is attempted.
964 * After a routing change, flush old routing
965 * and allocate a (hopefully) better one.
968 in6_rtchange(struct inpcb *inp, int errno)
970 if (inp->in6p_route.ro_rt) {
971 rtfree(inp->in6p_route.ro_rt);
972 inp->in6p_route.ro_rt = 0;
974 * A new route can be allocated the next time
975 * output is attempted.
981 * Lookup PCB in hash list.
984 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
985 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
986 int wildcard, struct ifnet *ifp)
988 struct inpcbhead *head;
990 u_short fport = fport_arg, lport = lport_arg;
993 if (faithprefix_p != NULL)
994 faith = (*faithprefix_p)(laddr);
999 * First look for an exact match.
1001 head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */,
1003 laddr->s6_addr32[3], /* XXX JH */
1005 pcbinfo->hashmask)];
1006 LIST_FOREACH(inp, head, inp_hash) {
1007 if ((inp->inp_vflag & INP_IPV6) == 0)
1009 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1010 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1011 inp->inp_fport == fport &&
1012 inp->inp_lport == lport) {
1020 struct inpcontainerhead *chead;
1021 struct inpcontainer *ic;
1022 struct inpcb *local_wild = NULL;
1024 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport,
1025 pcbinfo->wildcardhashmask)];
1026 LIST_FOREACH(ic, chead, ic_list) {
1029 if (!(inp->inp_vflag & INP_IPV6))
1031 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1032 inp->inp_lport == lport) {
1033 if (faith && (inp->inp_flags & INP_FAITH) == 0)
1035 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
1038 else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
1042 return (local_wild);
1052 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1056 ip = mtod(m, struct ip6_hdr *);
1057 bzero(sin6, sizeof(*sin6));
1058 sin6->sin6_len = sizeof(*sin6);
1059 sin6->sin6_family = AF_INET6;
1060 sin6->sin6_addr = ip->ip6_src;
1061 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1062 sin6->sin6_addr.s6_addr16[1] = 0;
1063 sin6->sin6_scope_id =
1064 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1065 ? m->m_pkthdr.rcvif->if_index : 0;