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 1.35 2008/09/04 09:08:22 hasso 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.
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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 <sys/thread2.h>
90 #include <vm/vm_zone.h>
93 #include <net/if_types.h>
94 #include <net/route.h>
96 #include <netinet/in.h>
97 #include <netinet/in_var.h>
98 #include <netinet/in_systm.h>
99 #include <netinet/ip6.h>
100 #include <netinet/ip_var.h>
101 #include <netinet6/ip6_var.h>
102 #include <netinet6/nd6.h>
103 #include <netinet/in_pcb.h>
104 #include <netinet6/in6_pcb.h>
107 #include <netinet6/ipsec.h>
109 #include <netinet6/ipsec6.h>
111 #include <netinet6/ah.h>
113 #include <netinet6/ah6.h>
115 #include <netproto/key/key.h>
119 #include <netproto/ipsec/ipsec.h>
120 #include <netproto/ipsec/ipsec6.h>
121 #include <netproto/ipsec/key.h>
123 #endif /* FAST_IPSEC */
125 struct in6_addr zeroin6_addr;
128 in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
130 struct socket *so = inp->inp_socket;
131 struct sockaddr_in6 *sin6 = NULL;
132 struct sockaddr_in6 jsin6;
133 struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
134 struct proc *p = td->td_proc;
135 struct ucred *cred = NULL;
137 int wild = 0, reuseport = (so->so_options & SO_REUSEPORT);
139 if (!in6_ifaddr) /* XXX broken! */
140 return (EADDRNOTAVAIL);
141 if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
143 if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0)
148 sin6 = (struct sockaddr_in6 *)nam;
149 if (nam->sa_len != sizeof(*sin6))
154 if (nam->sa_family != AF_INET6)
155 return (EAFNOSUPPORT);
157 if (!prison_replace_wildcards(td, nam))
160 /* KAME hack: embed scopeid */
161 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, NULL) != 0)
163 /* this must be cleared for ifa_ifwithaddr() */
164 sin6->sin6_scope_id = 0;
166 lport = sin6->sin6_port;
167 if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
169 * Treat SO_REUSEADDR as SO_REUSEPORT for multicast;
170 * allow compepte duplication of binding if
171 * SO_REUSEPORT is set, or if SO_REUSEADDR is set
172 * and a multicast address is bound on both
173 * new and duplicated sockets.
175 if (so->so_options & SO_REUSEADDR)
176 reuseport = SO_REUSEADDR|SO_REUSEPORT;
177 } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
178 struct ifaddr *ia = NULL;
180 sin6->sin6_port = 0; /* yech... */
181 if (!prison_replace_wildcards(td, (struct sockaddr *)sin6)) {
182 sin6->sin6_addr = kin6addr_any;
185 if ((ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == 0)
186 return (EADDRNOTAVAIL);
189 * XXX: bind to an anycast address might accidentally
190 * cause sending a packet with anycast source address.
191 * We should allow to bind to a deprecated address, since
192 * the application dare to use it.
195 ((struct in6_ifaddr *)ia)->ia6_flags &
196 (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) {
197 return (EADDRNOTAVAIL);
204 if (ntohs(lport) < IPV6PORT_RESERVED && cred &&
205 priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0))
207 if (so->so_cred->cr_uid != 0 &&
208 !IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
209 t = in6_pcblookup_local(pcbinfo,
210 &sin6->sin6_addr, lport,
211 INPLOOKUP_WILDCARD, cred);
213 (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) ||
214 !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) ||
215 (t->inp_socket->so_options &
216 SO_REUSEPORT) == 0) &&
217 (so->so_cred->cr_uid !=
218 t->inp_socket->so_cred->cr_uid))
220 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
221 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
222 struct sockaddr_in sin;
224 in6_sin6_2_sin(&sin, sin6);
225 t = in_pcblookup_local(pcbinfo,
227 INPLOOKUP_WILDCARD, cred);
229 (so->so_cred->cr_uid !=
230 t->inp_socket->so_cred->cr_uid) &&
231 (ntohl(t->inp_laddr.s_addr) !=
234 INP_SOCKAF(t->inp_socket)))
238 if (cred && cred->cr_prison &&
239 !prison_replace_wildcards(td, nam))
240 return(EADDRNOTAVAIL);
241 t = in6_pcblookup_local(pcbinfo, &sin6->sin6_addr,
243 if (t && (reuseport & t->inp_socket->so_options) == 0)
245 if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0 &&
246 IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) {
247 struct sockaddr_in sin;
249 in6_sin6_2_sin(&sin, sin6);
250 t = in_pcblookup_local(pcbinfo,
254 (reuseport & t->inp_socket->so_options)
256 (ntohl(t->inp_laddr.s_addr)
259 INP_SOCKAF(t->inp_socket)))
263 inp->in6p_laddr = sin6->sin6_addr;
268 jsin6.sin6_addr = inp->in6p_laddr;
269 jsin6.sin6_family = AF_INET6;
270 if (!prison_replace_wildcards(td, (struct sockaddr*)&jsin6)) {
271 inp->in6p_laddr = kin6addr_any;
276 if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, td)) != 0)
280 inp->inp_lport = lport;
281 if (in_pcbinsporthash(inp) != 0) {
282 inp->in6p_laddr = kin6addr_any;
291 * Transform old in6_pcbconnect() into an inner subroutine for new
292 * in6_pcbconnect(): Do some validity-checking on the remote
293 * address (in mbuf 'nam') and then determine local host address
294 * (i.e., which interface) to use to access that remote host.
296 * This preserves definition of in6_pcbconnect(), while supporting a
297 * slightly different version for T/TCP. (This is more than
298 * a bit of a kludge, but cleaning up the internal interfaces would
299 * have forced minor changes in every protocol).
303 in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam,
304 struct in6_addr **plocal_addr6, struct thread *td)
306 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
307 struct ifnet *ifp = NULL;
310 if (nam->sa_len != sizeof (*sin6))
312 if (sin6->sin6_family != AF_INET6)
313 return (EAFNOSUPPORT);
314 if (sin6->sin6_port == 0)
315 return (EADDRNOTAVAIL);
317 /* KAME hack: embed scopeid */
318 if (in6_embedscope(&sin6->sin6_addr, sin6, inp, &ifp) != 0)
323 * If the destination address is UNSPECIFIED addr,
324 * use the loopback addr, e.g ::1.
326 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
327 sin6->sin6_addr = kin6addr_loopback;
331 * XXX: in6_selectsrc might replace the bound local address
332 * with the address specified by setsockopt(IPV6_PKTINFO).
333 * Is it the intended behavior?
335 *plocal_addr6 = in6_selectsrc(sin6, inp->in6p_outputopts,
338 &inp->in6p_laddr, &error, td);
339 if (*plocal_addr6 == 0) {
341 error = EADDRNOTAVAIL;
345 * Don't do pcblookup call here; return interface in
347 * and exit to caller, that will do the lookup.
351 if (inp->in6p_route.ro_rt)
352 ifp = inp->in6p_route.ro_rt->rt_ifp;
359 * Connect from a socket to a specified address.
360 * Both address and port must be specified in argument sin.
361 * If don't have a local address for this socket yet,
365 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct thread *td)
367 struct in6_addr *addr6;
368 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)nam;
372 * Call inner routine, to assign local interface address.
373 * in6_pcbladdr() may automatically fill in sin6_scope_id.
375 if ((error = in6_pcbladdr(inp, nam, &addr6, td)) != 0)
378 if (in6_pcblookup_hash(inp->inp_cpcbinfo, &sin6->sin6_addr,
380 IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)
381 ? addr6 : &inp->in6p_laddr,
382 inp->inp_lport, 0, NULL) != NULL) {
385 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
386 if (inp->inp_lport == 0) {
387 error = in6_pcbbind(inp, NULL, td);
391 inp->in6p_laddr = *addr6;
393 inp->in6p_faddr = sin6->sin6_addr;
394 inp->inp_fport = sin6->sin6_port;
395 /* update flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
396 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
397 if (inp->in6p_flags & IN6P_AUTOFLOWLABEL)
398 inp->in6p_flowinfo |=
399 (htonl(ip6_flow_seq++) & IPV6_FLOWLABEL_MASK);
401 in_pcbinsconnhash(inp);
407 * Return an IPv6 address, which is the most appropriate for given
408 * destination and user specified options.
409 * If necessary, this function lookups the routing table and return
410 * an entry to the caller for later use.
413 in6_selectsrc(struct sockaddr_in6 *dstsock, struct ip6_pktopts *opts,
414 struct ip6_moptions *mopts, struct route_in6 *ro,
415 struct in6_addr *laddr, int *errorp, struct thread *td)
417 struct sockaddr_in6 jsin6;
418 struct ucred *cred = NULL;
419 struct in6_addr *dst;
420 struct in6_ifaddr *ia6 = 0;
421 struct in6_pktinfo *pi = NULL;
424 if (td && td->td_proc && td->td_proc->p_ucred)
425 cred = td->td_proc->p_ucred;
426 if (cred && cred->cr_prison)
428 jsin6.sin6_family = AF_INET6;
429 dst = &dstsock->sin6_addr;
433 * If the source address is explicitly specified by the caller,
436 if (opts && (pi = opts->ip6po_pktinfo) &&
437 !IN6_IS_ADDR_UNSPECIFIED(&pi->ipi6_addr)) {
438 jsin6.sin6_addr = pi->ipi6_addr;
439 if (jailed && !jailed_ip(cred->cr_prison,
440 (struct sockaddr *)&jsin6)) {
443 return (&pi->ipi6_addr);
448 * If the source address is not specified but the socket(if any)
449 * is already bound, use the bound address.
451 if (laddr && !IN6_IS_ADDR_UNSPECIFIED(laddr)) {
452 jsin6.sin6_addr = *laddr;
453 if (jailed && !jailed_ip(cred->cr_prison,
454 (struct sockaddr *)&jsin6)) {
462 * If the caller doesn't specify the source address but
463 * the outgoing interface, use an address associated with
466 if (pi && pi->ipi6_ifindex) {
467 /* XXX boundary check is assumed to be already done. */
468 ia6 = in6_ifawithscope(ifindex2ifnet[pi->ipi6_ifindex],
472 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
473 if (!jailed_ip(cred->cr_prison,
474 (struct sockaddr *)&jsin6))
479 *errorp = EADDRNOTAVAIL;
482 return (&satosin6(&ia6->ia_addr)->sin6_addr);
486 * If the destination address is a link-local unicast address or
487 * a multicast address, and if the outgoing interface is specified
488 * by the sin6_scope_id filed, use an address associated with the
490 * XXX: We're now trying to define more specific semantics of
491 * sin6_scope_id field, so this part will be rewritten in
494 if ((IN6_IS_ADDR_LINKLOCAL(dst) || IN6_IS_ADDR_MULTICAST(dst)) &&
495 dstsock->sin6_scope_id) {
497 * I'm not sure if boundary check for scope_id is done
500 if (dstsock->sin6_scope_id < 0 ||
501 if_index < dstsock->sin6_scope_id) {
502 *errorp = ENXIO; /* XXX: better error? */
505 ia6 = in6_ifawithscope(ifindex2ifnet[dstsock->sin6_scope_id],
509 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
510 if (!jailed_ip(cred->cr_prison,
511 (struct sockaddr *)&jsin6))
516 *errorp = EADDRNOTAVAIL;
519 return (&satosin6(&ia6->ia_addr)->sin6_addr);
523 * If the destination address is a multicast address and
524 * the outgoing interface for the address is specified
525 * by the caller, use an address associated with the interface.
526 * There is a sanity check here; if the destination has node-local
527 * scope, the outgoing interfacde should be a loopback address.
528 * Even if the outgoing interface is not specified, we also
529 * choose a loopback interface as the outgoing interface.
531 if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
532 struct ifnet *ifp = mopts ? mopts->im6o_multicast_ifp : NULL;
534 if (ifp == NULL && IN6_IS_ADDR_MC_NODELOCAL(dst)) {
539 ia6 = in6_ifawithscope(ifp, dst);
541 *errorp = EADDRNOTAVAIL;
544 return (&ia6->ia_addr.sin6_addr);
549 * If the next hop address for the packet is specified
550 * by caller, use an address associated with the route
554 struct sockaddr_in6 *sin6_next;
557 if (opts && opts->ip6po_nexthop) {
558 sin6_next = satosin6(opts->ip6po_nexthop);
559 rt = nd6_lookup(&sin6_next->sin6_addr, 1, NULL);
561 ia6 = in6_ifawithscope(rt->rt_ifp, dst);
563 ia6 = ifatoia6(rt->rt_ifa);
566 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
567 if (!jailed_ip(cred->cr_prison,
568 (struct sockaddr *)&jsin6))
573 *errorp = EADDRNOTAVAIL;
576 return (&satosin6(&ia6->ia_addr)->sin6_addr);
581 * If route is known or can be allocated now,
582 * our src addr is taken from the i/f, else punt.
586 !IN6_ARE_ADDR_EQUAL(&satosin6(&ro->ro_dst)->sin6_addr, dst)) {
590 if (ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL) {
591 struct sockaddr_in6 *dst6;
593 /* No route yet, so try to acquire one */
594 bzero(&ro->ro_dst, sizeof(struct sockaddr_in6));
596 dst6->sin6_family = AF_INET6;
597 dst6->sin6_len = sizeof(struct sockaddr_in6);
598 dst6->sin6_addr = *dst;
599 if (!jailed && IN6_IS_ADDR_MULTICAST(dst)) {
601 rtpurelookup((struct sockaddr *)&ro->ro_dst);
603 rtalloc((struct route *)ro);
608 * in_pcbconnect() checks out IFF_LOOPBACK to skip using
609 * the address. But we don't know why it does so.
610 * It is necessary to ensure the scope even for lo0
611 * so doesn't check out IFF_LOOPBACK.
615 ia6 = in6_ifawithscope(ro->ro_rt->rt_ifa->ifa_ifp, dst);
617 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
618 if (!jailed_ip(cred->cr_prison,
619 (struct sockaddr *)&jsin6))
623 if (ia6 == 0) /* xxx scope error ?*/
624 ia6 = ifatoia6(ro->ro_rt->rt_ifa);
627 jsin6.sin6_addr = (&ia6->ia_addr)->sin6_addr;
628 if (!jailed_ip(cred->cr_prison,
629 (struct sockaddr *)&jsin6))
634 *errorp = EHOSTUNREACH; /* no route */
637 return (&satosin6(&ia6->ia_addr)->sin6_addr);
640 *errorp = EADDRNOTAVAIL;
645 * Default hop limit selection. The precedence is as follows:
646 * 1. Hoplimit valued specified via ioctl.
647 * 2. (If the outgoing interface is detected) the current
648 * hop limit of the interface specified by router advertisement.
649 * 3. The system default hoplimit.
652 in6_selecthlim(struct in6pcb *in6p, struct ifnet *ifp)
654 if (in6p && in6p->in6p_hops >= 0)
655 return (in6p->in6p_hops);
657 return (ND_IFINFO(ifp)->chlim);
659 return (ip6_defhlim);
664 in6_pcbdisconnect(struct inpcb *inp)
666 bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr));
668 /* clear flowinfo - draft-itojun-ipv6-flowlabel-api-00 */
669 inp->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK;
670 in_pcbremconnhash(inp);
671 if (inp->inp_socket->so_state & SS_NOFDREF)
676 in6_pcbdetach(struct inpcb *inp)
678 struct socket *so = inp->inp_socket;
679 struct inpcbinfo *ipi = inp->inp_pcbinfo;
682 if (inp->in6p_sp != NULL)
683 ipsec6_delete_pcbpolicy(inp);
685 inp->inp_gencnt = ++ipi->ipi_gencnt;
690 if (inp->in6p_options)
691 m_freem(inp->in6p_options);
692 ip6_freepcbopts(inp->in6p_outputopts);
693 ip6_freemoptions(inp->in6p_moptions);
694 if (inp->in6p_route.ro_rt)
695 rtfree(inp->in6p_route.ro_rt);
696 /* Check and free IPv4 related resources in case of mapped addr */
697 if (inp->inp_options)
698 m_free(inp->inp_options);
699 ip_freemoptions(inp->inp_moptions);
706 * The calling convention of in6_setsockaddr() and in6_setpeeraddr() was
707 * modified to match the pru_sockaddr() and pru_peeraddr() entry points
708 * in struct pr_usrreqs, so that protocols can just reference then directly
709 * without the need for a wrapper function. The socket must have a valid
710 * (i.e., non-nil) PCB, but it should be impossible to get an invalid one
711 * except through a kernel programming error, so it is acceptable to panic
712 * (or in this case trap) if the PCB is invalid. (Actually, we don't trap
713 * because there actually /is/ a programming error somewhere... XXX)
716 in6_setsockaddr(struct socket *so, struct sockaddr **nam)
719 struct sockaddr_in6 *sin6;
722 * Do the malloc first in case it blocks.
724 MALLOC(sin6, struct sockaddr_in6 *, sizeof *sin6, M_SONAME,
726 sin6->sin6_family = AF_INET6;
727 sin6->sin6_len = sizeof(*sin6);
733 kfree(sin6, M_SONAME);
736 sin6->sin6_port = inp->inp_lport;
737 sin6->sin6_addr = inp->in6p_laddr;
739 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
740 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
742 sin6->sin6_scope_id = 0; /*XXX*/
743 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
744 sin6->sin6_addr.s6_addr16[1] = 0;
746 *nam = (struct sockaddr *)sin6;
751 in6_setpeeraddr(struct socket *so, struct sockaddr **nam)
754 struct sockaddr_in6 *sin6;
757 * Do the malloc first in case it blocks.
759 MALLOC(sin6, struct sockaddr_in6 *, sizeof(*sin6), M_SONAME,
761 sin6->sin6_family = AF_INET6;
762 sin6->sin6_len = sizeof(struct sockaddr_in6);
768 kfree(sin6, M_SONAME);
771 sin6->sin6_port = inp->inp_fport;
772 sin6->sin6_addr = inp->in6p_faddr;
774 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
775 sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]);
777 sin6->sin6_scope_id = 0; /*XXX*/
778 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
779 sin6->sin6_addr.s6_addr16[1] = 0;
781 *nam = (struct sockaddr *)sin6;
786 in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam)
788 struct inpcb *inp = so->so_pcb;
793 if (inp->inp_vflag & INP_IPV4) {
794 error = in_setsockaddr(so, nam);
796 in6_sin_2_v4mapsin6_in_sock(nam);
798 /* scope issues will be handled in in6_setsockaddr(). */
799 error = in6_setsockaddr(so, nam);
805 in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam)
807 struct inpcb *inp = so->so_pcb;
812 if (inp->inp_vflag & INP_IPV4) {
813 error = in_setpeeraddr(so, nam);
815 in6_sin_2_v4mapsin6_in_sock(nam);
817 /* scope issues will be handled in in6_setpeeraddr(). */
818 error = in6_setpeeraddr(so, nam);
824 * Pass some notification to all connections of a protocol
825 * associated with address dst. The local address and/or port numbers
826 * may be specified to limit the search. The "usual action" will be
827 * taken, depending on the ctlinput cmd. The caller must filter any
828 * cmds that are uninteresting (e.g., no error in the map).
829 * Call the protocol specific routine (if any) to report
830 * any errors for each matching socket.
832 * Must be called under crit_enter().
835 in6_pcbnotify(struct inpcbhead *head, struct sockaddr *dst, in_port_t fport,
836 const struct sockaddr *src, in_port_t lport, int cmd, int arg,
837 void (*notify) (struct inpcb *, int))
839 struct inpcb *inp, *ninp;
840 struct sockaddr_in6 sa6_src, *sa6_dst;
843 if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6)
846 sa6_dst = (struct sockaddr_in6 *)dst;
847 if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr))
851 * note that src can be NULL when we get notify by local fragmentation.
853 sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src;
854 flowinfo = sa6_src.sin6_flowinfo;
857 * Redirects go to all references to the destination,
858 * and use in6_rtchange to invalidate the route cache.
859 * Dead host indications: also use in6_rtchange to invalidate
860 * the cache, and deliver the error to all the sockets.
861 * Otherwise, if we have knowledge of the local port and address,
862 * deliver only to that socket.
864 if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) {
867 bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr));
869 if (cmd != PRC_HOSTDEAD)
870 notify = in6_rtchange;
872 if (cmd != PRC_MSGSIZE)
873 arg = inet6ctlerrmap[cmd];
875 for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) {
876 ninp = LIST_NEXT(inp, inp_list);
878 if (inp->inp_flags & INP_PLACEMARKER)
881 if ((inp->inp_vflag & INP_IPV6) == 0)
884 * If the error designates a new path MTU for a destination
885 * and the application (associated with this socket) wanted to
886 * know the value, notify. Note that we notify for all
887 * disconnected sockets if the corresponding application
888 * wanted. This is because some UDP applications keep sending
889 * sockets disconnected.
890 * XXX: should we avoid to notify the value to TCP sockets?
892 if (cmd == PRC_MSGSIZE && (inp->inp_flags & IN6P_MTU) != 0 &&
893 (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) ||
894 IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, &sa6_dst->sin6_addr))) {
895 ip6_notify_pmtu(inp, (struct sockaddr_in6 *)dst, &arg);
899 * Detect if we should notify the error. If no source and
900 * destination ports are specifed, but non-zero flowinfo and
901 * local address match, notify the error. This is the case
902 * when the error is delivered with an encrypted buffer
903 * by ESP. Otherwise, just compare addresses and ports
906 if (lport == 0 && fport == 0 && flowinfo &&
907 inp->inp_socket != NULL &&
908 flowinfo == (inp->in6p_flowinfo & IPV6_FLOWLABEL_MASK) &&
909 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sa6_src.sin6_addr))
911 else if (!IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr,
912 &sa6_dst->sin6_addr) ||
913 inp->inp_socket == 0 ||
914 (lport && inp->inp_lport != lport) ||
915 (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) &&
916 !IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
917 &sa6_src.sin6_addr)) ||
918 (fport && inp->inp_fport != fport))
929 * Lookup a PCB based on the local address and port.
932 in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr,
933 u_int lport_arg, int wild_okay, struct ucred *cred)
936 int matchwild = 3, wildcard;
937 u_short lport = lport_arg;
938 struct inpcbporthead *porthash;
939 struct inpcbport *phd;
940 struct inpcb *match = NULL;
943 * Best fit PCB lookup.
945 * First see if this local port is in use by looking on the
948 porthash = &pcbinfo->porthashbase[INP_PCBPORTHASH(lport,
949 pcbinfo->porthashmask)];
950 LIST_FOREACH(phd, porthash, phd_hash) {
951 if (phd->phd_port == lport)
956 * Port is in use by one or more PCBs. Look for best
959 LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) {
961 if ((inp->inp_vflag & INP_IPV6) == 0)
963 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
965 if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
966 if (IN6_IS_ADDR_UNSPECIFIED(laddr))
968 else if (!IN6_ARE_ADDR_EQUAL(
969 &inp->in6p_laddr, laddr))
972 if (!IN6_IS_ADDR_UNSPECIFIED(laddr))
975 if (wildcard && !wild_okay)
977 if (wildcard < matchwild &&
980 inp->inp_socket->so_cred->cr_prison)) {
982 matchwild = wildcard;
986 matchwild = wildcard;
994 in6_pcbpurgeif0(struct in6pcb *head, struct ifnet *ifp)
997 struct ip6_moptions *im6o;
998 struct in6_multi_mship *imm, *nimm;
1000 for (in6p = head; in6p != NULL; in6p = LIST_NEXT(in6p, inp_list)) {
1001 if (in6p->in6p_flags & INP_PLACEMARKER)
1003 im6o = in6p->in6p_moptions;
1004 if ((in6p->inp_vflag & INP_IPV6) &&
1007 * Unselect the outgoing interface if it is being
1010 if (im6o->im6o_multicast_ifp == ifp)
1011 im6o->im6o_multicast_ifp = NULL;
1014 * Drop multicast group membership if we joined
1015 * through the interface being detached.
1016 * XXX controversial - is it really legal for kernel
1019 for (imm = im6o->im6o_memberships.lh_first;
1020 imm != NULL; imm = nimm) {
1021 nimm = imm->i6mm_chain.le_next;
1022 if (imm->i6mm_maddr->in6m_ifp == ifp) {
1023 LIST_REMOVE(imm, i6mm_chain);
1024 in6_delmulti(imm->i6mm_maddr);
1025 kfree(imm, M_IPMADDR);
1033 * Check for alternatives when higher level complains
1034 * about service problems. For now, invalidate cached
1035 * routing information. If the route was created dynamically
1036 * (by a redirect), time to try a default gateway again.
1039 in6_losing(struct inpcb *in6p)
1042 struct rt_addrinfo info;
1044 if ((rt = in6p->in6p_route.ro_rt) != NULL) {
1045 bzero((caddr_t)&info, sizeof(info));
1046 info.rti_flags = rt->rt_flags;
1047 info.rti_info[RTAX_DST] = rt_key(rt);
1048 info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
1049 info.rti_info[RTAX_NETMASK] = rt_mask(rt);
1050 rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0);
1051 if (rt->rt_flags & RTF_DYNAMIC)
1052 rtrequest1_global(RTM_DELETE, &info, NULL, NULL);
1053 in6p->in6p_route.ro_rt = NULL;
1056 * A new route can be allocated
1057 * the next time output is attempted.
1063 * After a routing change, flush old routing
1064 * and allocate a (hopefully) better one.
1067 in6_rtchange(struct inpcb *inp, int error)
1069 if (inp->in6p_route.ro_rt) {
1070 rtfree(inp->in6p_route.ro_rt);
1071 inp->in6p_route.ro_rt = 0;
1073 * A new route can be allocated the next time
1074 * output is attempted.
1080 * Lookup PCB in hash list.
1083 in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr,
1084 u_int fport_arg, struct in6_addr *laddr, u_int lport_arg,
1085 int wildcard, struct ifnet *ifp)
1087 struct inpcbhead *head;
1089 struct inpcb *jinp = NULL;
1090 u_short fport = fport_arg, lport = lport_arg;
1093 if (faithprefix_p != NULL)
1094 faith = (*faithprefix_p)(laddr);
1099 * First look for an exact match.
1101 head = &pcbinfo->hashbase[INP_PCBCONNHASH(faddr->s6_addr32[3] /* XXX */,
1103 laddr->s6_addr32[3], /* XXX JH */
1105 pcbinfo->hashmask)];
1106 LIST_FOREACH(inp, head, inp_hash) {
1107 if ((inp->inp_vflag & INP_IPV6) == 0)
1109 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) &&
1110 IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr) &&
1111 inp->inp_fport == fport &&
1112 inp->inp_lport == lport) {
1116 if (inp->inp_socket == NULL ||
1117 inp->inp_socket->so_cred->cr_prison == NULL) {
1128 struct inpcontainerhead *chead;
1129 struct inpcontainer *ic;
1130 struct inpcb *local_wild = NULL;
1131 struct inpcb *jinp_wild = NULL;
1132 struct sockaddr_in6 jsin6;
1136 * Order of socket selection:
1137 * 1. non-jailed, non-wild.
1138 * 2. non-jailed, wild.
1139 * 3. jailed, non-wild.
1142 jsin6.sin6_family = AF_INET6;
1143 chead = &pcbinfo->wildcardhashbase[INP_PCBWILDCARDHASH(lport,
1144 pcbinfo->wildcardhashmask)];
1145 LIST_FOREACH(ic, chead, ic_list) {
1148 if (!(inp->inp_vflag & INP_IPV6))
1150 if (inp->inp_socket != NULL)
1151 cred = inp->inp_socket->so_cred;
1155 if (cred != NULL && jailed(cred)) {
1159 jsin6.sin6_addr = *laddr;
1160 if (!jailed_ip(cred->cr_prison,
1161 (struct sockaddr *)&jsin6))
1165 if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) &&
1166 inp->inp_lport == lport) {
1167 if (faith && (inp->inp_flags & INP_FAITH) == 0)
1169 if (IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr,
1171 if (cred != NULL && jailed(cred))
1175 } else if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) {
1176 if (cred != NULL && jailed(cred))
1183 if (local_wild != NULL)
1184 return (local_wild);
1197 init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m)
1201 ip = mtod(m, struct ip6_hdr *);
1202 bzero(sin6, sizeof(*sin6));
1203 sin6->sin6_len = sizeof(*sin6);
1204 sin6->sin6_family = AF_INET6;
1205 sin6->sin6_addr = ip->ip6_src;
1206 if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1207 sin6->sin6_addr.s6_addr16[1] = 0;
1208 sin6->sin6_scope_id =
1209 (m->m_pkthdr.rcvif && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr))
1210 ? m->m_pkthdr.rcvif->if_index : 0;