/* $NetBSD: in6_pcb.c,v 1.143 2015/08/24 22:21:27 pooka Exp $ */ /* $KAME: in6_pcb.c,v 1.84 2001/02/08 18:02:08 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Copyright (c) 1982, 1986, 1991, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)in_pcb.c 8.2 (Berkeley) 1/4/94 */ #include __KERNEL_RCSID(0, "$NetBSD: in6_pcb.c,v 1.143 2015/08/24 22:21:27 pooka Exp $"); #ifdef _KERNEL_OPT #include "opt_inet.h" #include "opt_ipsec.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "faith.h" #ifdef IPSEC #include #include #include #endif /* IPSEC */ #include const struct in6_addr zeroin6_addr; #define IN6PCBHASH_PORT(table, lport) \ &(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash] #define IN6PCBHASH_BIND(table, laddr, lport) \ &(table)->inpt_bindhashtbl[ \ (((laddr)->s6_addr32[0] ^ (laddr)->s6_addr32[1] ^ \ (laddr)->s6_addr32[2] ^ (laddr)->s6_addr32[3]) + ntohs(lport)) & \ (table)->inpt_bindhash] #define IN6PCBHASH_CONNECT(table, faddr, fport, laddr, lport) \ &(table)->inpt_bindhashtbl[ \ ((((faddr)->s6_addr32[0] ^ (faddr)->s6_addr32[1] ^ \ (faddr)->s6_addr32[2] ^ (faddr)->s6_addr32[3]) + ntohs(fport)) + \ (((laddr)->s6_addr32[0] ^ (laddr)->s6_addr32[1] ^ \ (laddr)->s6_addr32[2] ^ (laddr)->s6_addr32[3]) + \ ntohs(lport))) & (table)->inpt_bindhash] int ip6_anonportmin = IPV6PORT_ANONMIN; int ip6_anonportmax = IPV6PORT_ANONMAX; int ip6_lowportmin = IPV6PORT_RESERVEDMIN; int ip6_lowportmax = IPV6PORT_RESERVEDMAX; static struct pool in6pcb_pool; static int in6pcb_poolinit(void) { pool_init(&in6pcb_pool, sizeof(struct in6pcb), 0, 0, 0, "in6pcbpl", NULL, IPL_SOFTNET); return 0; } void in6_pcbinit(struct inpcbtable *table, int bindhashsize, int connecthashsize) { static ONCE_DECL(control); in_pcbinit(table, bindhashsize, connecthashsize); table->inpt_lastport = (u_int16_t)ip6_anonportmax; RUN_ONCE(&control, in6pcb_poolinit); } int in6_pcballoc(struct socket *so, void *v) { struct inpcbtable *table = v; struct in6pcb *in6p; int s; s = splnet(); in6p = pool_get(&in6pcb_pool, PR_NOWAIT); splx(s); if (in6p == NULL) return (ENOBUFS); memset((void *)in6p, 0, sizeof(*in6p)); in6p->in6p_af = AF_INET6; in6p->in6p_table = table; in6p->in6p_socket = so; in6p->in6p_hops = -1; /* use kernel default */ in6p->in6p_icmp6filt = NULL; in6p->in6p_portalgo = PORTALGO_DEFAULT; in6p->in6p_bindportonsend = false; #if defined(IPSEC) if (ipsec_enabled) { int error = ipsec_init_pcbpolicy(so, &in6p->in6p_sp); if (error != 0) { s = splnet(); pool_put(&in6pcb_pool, in6p); splx(s); return error; } } #endif /* IPSEC */ s = splnet(); TAILQ_INSERT_HEAD(&table->inpt_queue, (struct inpcb_hdr*)in6p, inph_queue); LIST_INSERT_HEAD(IN6PCBHASH_PORT(table, in6p->in6p_lport), &in6p->in6p_head, inph_lhash); in6_pcbstate(in6p, IN6P_ATTACHED); splx(s); if (ip6_v6only) in6p->in6p_flags |= IN6P_IPV6_V6ONLY; so->so_pcb = (void *)in6p; return (0); } /* * Bind address from sin6 to in6p. */ static int in6_pcbbind_addr(struct in6pcb *in6p, struct sockaddr_in6 *sin6, struct lwp *l) { int error; /* * We should check the family, but old programs * incorrectly fail to intialize it. */ if (sin6->sin6_family != AF_INET6) return (EAFNOSUPPORT); #ifndef INET if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) return (EADDRNOTAVAIL); #endif if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) return (error); if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) return (EINVAL); if (sin6->sin6_addr.s6_addr32[3]) { struct sockaddr_in sin; memset(&sin, 0, sizeof(sin)); sin.sin_len = sizeof(sin); sin.sin_family = AF_INET; bcopy(&sin6->sin6_addr.s6_addr32[3], &sin.sin_addr, sizeof(sin.sin_addr)); if (!IN_MULTICAST(sin.sin_addr.s_addr) && ifa_ifwithaddr((struct sockaddr *)&sin) == NULL) return EADDRNOTAVAIL; } } else if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { // succeed } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr)) { struct ifaddr *ia = NULL; if ((in6p->in6p_flags & IN6P_FAITH) == 0 && (ia = ifa_ifwithaddr((struct sockaddr *)sin6)) == NULL) return (EADDRNOTAVAIL); /* * bind to an anycast address might accidentally * cause sending a packet with an anycast source * address, so we forbid it. * * We should allow to bind to a deprecated address, * since the application dare to use it. * But, can we assume that they are careful enough * to check if the address is deprecated or not? * Maybe, as a safeguard, we should have a setsockopt * flag to control the bind(2) behavior against * deprecated addresses (default: forbid bind(2)). */ if (ia && ((struct in6_ifaddr *)ia)->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY|IN6_IFF_DETACHED)) return (EADDRNOTAVAIL); } in6p->in6p_laddr = sin6->sin6_addr; return (0); } /* * Bind port from sin6 to in6p. */ static int in6_pcbbind_port(struct in6pcb *in6p, struct sockaddr_in6 *sin6, struct lwp *l) { struct inpcbtable *table = in6p->in6p_table; struct socket *so = in6p->in6p_socket; int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); int error; if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || (so->so_options & SO_ACCEPTCONN) == 0)) wild = 1; if (sin6->sin6_port != 0) { enum kauth_network_req req; #ifndef IPNOPRIVPORTS if (ntohs(sin6->sin6_port) < IPV6PORT_RESERVED) req = KAUTH_REQ_NETWORK_BIND_PRIVPORT; else #endif /* IPNOPRIVPORTS */ req = KAUTH_REQ_NETWORK_BIND_PORT; error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_BIND, req, so, sin6, NULL); if (error) return (EACCES); } if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) { /* * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; * allow compepte duplication of binding if * SO_REUSEPORT is set, or if SO_REUSEADDR is set * and a multicast address is bound on both * new and duplicated sockets. */ if (so->so_options & (SO_REUSEADDR | SO_REUSEPORT)) reuseport = SO_REUSEADDR|SO_REUSEPORT; } if (sin6->sin6_port != 0) { if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { #ifdef INET struct inpcb *t; struct vestigial_inpcb vestige; t = in_pcblookup_port(table, *(struct in_addr *)&sin6->sin6_addr.s6_addr32[3], sin6->sin6_port, wild, &vestige); if (t && (reuseport & t->inp_socket->so_options) == 0) return (EADDRINUSE); if (!t && vestige.valid && !(reuseport && vestige.reuse_port)) return EADDRINUSE; #else return (EADDRNOTAVAIL); #endif } { struct in6pcb *t; struct vestigial_inpcb vestige; t = in6_pcblookup_port(table, &sin6->sin6_addr, sin6->sin6_port, wild, &vestige); if (t && (reuseport & t->in6p_socket->so_options) == 0) return (EADDRINUSE); if (!t && vestige.valid && !(reuseport && vestige.reuse_port)) return EADDRINUSE; } } if (sin6->sin6_port == 0) { int e; e = in6_pcbsetport(sin6, in6p, l); if (e != 0) return (e); } else { in6p->in6p_lport = sin6->sin6_port; in6_pcbstate(in6p, IN6P_BOUND); } LIST_REMOVE(&in6p->in6p_head, inph_lhash); LIST_INSERT_HEAD(IN6PCBHASH_PORT(table, in6p->in6p_lport), &in6p->in6p_head, inph_lhash); return (0); } int in6_pcbbind(void *v, struct sockaddr_in6 *sin6, struct lwp *l) { struct in6pcb *in6p = v; struct sockaddr_in6 lsin6; int error; if (in6p->in6p_af != AF_INET6) return (EINVAL); /* * If we already have a local port or a local address it means we're * bounded. */ if (in6p->in6p_lport || !(IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) || (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) && in6p->in6p_laddr.s6_addr32[3] == 0))) return (EINVAL); if (NULL != sin6) { /* We were provided a sockaddr_in6 to use. */ if (sin6->sin6_len != sizeof(*sin6)) return (EINVAL); } else { /* We always bind to *something*, even if it's "anything". */ lsin6 = *((const struct sockaddr_in6 *) in6p->in6p_socket->so_proto->pr_domain->dom_sa_any); sin6 = &lsin6; } /* Bind address. */ error = in6_pcbbind_addr(in6p, sin6, l); if (error) return (error); /* Bind port. */ error = in6_pcbbind_port(in6p, sin6, l); if (error) { /* * Reset the address here to "any" so we don't "leak" the * in6pcb. */ in6p->in6p_laddr = in6addr_any; return (error); } #if 0 in6p->in6p_flowinfo = 0; /* XXX */ #endif return (0); } /* * Connect from a socket to a specified address. * Both address and port must be specified in argument sin6. * If don't have a local address for this socket yet, * then pick one. */ int in6_pcbconnect(void *v, struct sockaddr_in6 *sin6, struct lwp *l) { struct in6pcb *in6p = v; struct in6_addr *in6a = NULL; struct ifnet *ifp = NULL; /* outgoing interface */ int error = 0; int scope_ambiguous = 0; #ifdef INET struct in6_addr mapped; #endif struct sockaddr_in6 tmp; struct vestigial_inpcb vestige; (void)&in6a; /* XXX fool gcc */ if (in6p->in6p_af != AF_INET6) return (EINVAL); if (sin6->sin6_len != sizeof(*sin6)) return (EINVAL); if (sin6->sin6_family != AF_INET6) return (EAFNOSUPPORT); if (sin6->sin6_port == 0) return (EADDRNOTAVAIL); if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) && in6p->in6p_socket->so_type == SOCK_STREAM) return EADDRNOTAVAIL; if (sin6->sin6_scope_id == 0 && !ip6_use_defzone) scope_ambiguous = 1; if ((error = sa6_embedscope(sin6, ip6_use_defzone)) != 0) return(error); /* sanity check for mapped address case */ if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) return EINVAL; if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) in6p->in6p_laddr.s6_addr16[5] = htons(0xffff); if (!IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) return EINVAL; } else { if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) return EINVAL; } /* protect *sin6 from overwrites */ tmp = *sin6; sin6 = &tmp; /* Source address selection. */ if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) && in6p->in6p_laddr.s6_addr32[3] == 0) { #ifdef INET struct sockaddr_in sin, *sinp; memset(&sin, 0, sizeof(sin)); sin.sin_len = sizeof(sin); sin.sin_family = AF_INET; memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr32[3], sizeof(sin.sin_addr)); sinp = in_selectsrc(&sin, &in6p->in6p_route, in6p->in6p_socket->so_options, NULL, &error); if (sinp == NULL) { if (error == 0) error = EADDRNOTAVAIL; return (error); } memset(&mapped, 0, sizeof(mapped)); mapped.s6_addr16[5] = htons(0xffff); memcpy(&mapped.s6_addr32[3], &sinp->sin_addr, sizeof(sinp->sin_addr)); in6a = &mapped; #else return EADDRNOTAVAIL; #endif } else { /* * XXX: in6_selectsrc might replace the bound local address * with the address specified by setsockopt(IPV6_PKTINFO). * Is it the intended behavior? */ in6a = in6_selectsrc(sin6, in6p->in6p_outputopts, in6p->in6p_moptions, &in6p->in6p_route, &in6p->in6p_laddr, &ifp, &error); if (ifp && scope_ambiguous && (error = in6_setscope(&sin6->sin6_addr, ifp, NULL)) != 0) { return(error); } if (in6a == NULL) { if (error == 0) error = EADDRNOTAVAIL; return (error); } } if (ifp != NULL) in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim(in6p, ifp); else in6p->in6p_ip6.ip6_hlim = (u_int8_t)in6_selecthlim_rt(in6p); if (in6_pcblookup_connect(in6p->in6p_table, &sin6->sin6_addr, sin6->sin6_port, IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) ? in6a : &in6p->in6p_laddr, in6p->in6p_lport, 0, &vestige) || vestige.valid) return (EADDRINUSE); if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) || (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) && in6p->in6p_laddr.s6_addr32[3] == 0)) { if (in6p->in6p_lport == 0) { error = in6_pcbbind(in6p, NULL, l); if (error != 0) return error; } in6p->in6p_laddr = *in6a; } in6p->in6p_faddr = sin6->sin6_addr; in6p->in6p_fport = sin6->sin6_port; /* Late bind, if needed */ if (in6p->in6p_bindportonsend) { struct sockaddr_in6 lsin = *((const struct sockaddr_in6 *) in6p->in6p_socket->so_proto->pr_domain->dom_sa_any); lsin.sin6_addr = in6p->in6p_laddr; lsin.sin6_port = 0; if ((error = in6_pcbbind_port(in6p, &lsin, l)) != 0) return error; } in6_pcbstate(in6p, IN6P_CONNECTED); in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; if (ip6_auto_flowlabel) in6p->in6p_flowinfo |= (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); #if defined(IPSEC) if (ipsec_enabled && in6p->in6p_socket->so_type == SOCK_STREAM) ipsec_pcbconn(in6p->in6p_sp); #endif return (0); } void in6_pcbdisconnect(struct in6pcb *in6p) { memset((void *)&in6p->in6p_faddr, 0, sizeof(in6p->in6p_faddr)); in6p->in6p_fport = 0; in6_pcbstate(in6p, IN6P_BOUND); in6p->in6p_flowinfo &= ~IPV6_FLOWLABEL_MASK; #if defined(IPSEC) if (ipsec_enabled) ipsec_pcbdisconn(in6p->in6p_sp); #endif if (in6p->in6p_socket->so_state & SS_NOFDREF) in6_pcbdetach(in6p); } void in6_pcbdetach(struct in6pcb *in6p) { struct socket *so = in6p->in6p_socket; int s; if (in6p->in6p_af != AF_INET6) return; #if defined(IPSEC) if (ipsec_enabled) ipsec6_delete_pcbpolicy(in6p); #endif so->so_pcb = NULL; s = splnet(); in6_pcbstate(in6p, IN6P_ATTACHED); LIST_REMOVE(&in6p->in6p_head, inph_lhash); TAILQ_REMOVE(&in6p->in6p_table->inpt_queue, &in6p->in6p_head, inph_queue); splx(s); if (in6p->in6p_options) { m_freem(in6p->in6p_options); } if (in6p->in6p_outputopts != NULL) { ip6_clearpktopts(in6p->in6p_outputopts, -1); free(in6p->in6p_outputopts, M_IP6OPT); } rtcache_free(&in6p->in6p_route); ip6_freemoptions(in6p->in6p_moptions); ip_freemoptions(in6p->in6p_v4moptions); sofree(so); /* drops the socket's lock */ pool_put(&in6pcb_pool, in6p); mutex_enter(softnet_lock); /* reacquire it */ } void in6_setsockaddr(struct in6pcb *in6p, struct sockaddr_in6 *sin6) { if (in6p->in6p_af != AF_INET6) return; sockaddr_in6_init(sin6, &in6p->in6p_laddr, in6p->in6p_lport, 0, 0); (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ } void in6_setpeeraddr(struct in6pcb *in6p, struct sockaddr_in6 *sin6) { if (in6p->in6p_af != AF_INET6) return; sockaddr_in6_init(sin6, &in6p->in6p_faddr, in6p->in6p_fport, 0, 0); (void)sa6_recoverscope(sin6); /* XXX: should catch errors */ } /* * Pass some notification to all connections of a protocol * associated with address dst. The local address and/or port numbers * may be specified to limit the search. The "usual action" will be * taken, depending on the ctlinput cmd. The caller must filter any * cmds that are uninteresting (e.g., no error in the map). * Call the protocol specific routine (if any) to report * any errors for each matching socket. * * Must be called at splsoftnet. * * Note: src (4th arg) carries the flowlabel value on the original IPv6 * header, in sin6_flowinfo member. */ int in6_pcbnotify(struct inpcbtable *table, const struct sockaddr *dst, u_int fport_arg, const struct sockaddr *src, u_int lport_arg, int cmd, void *cmdarg, void (*notify)(struct in6pcb *, int)) { struct rtentry *rt; struct inpcb_hdr *inph, *ninph; struct sockaddr_in6 sa6_src; const struct sockaddr_in6 *sa6_dst; u_int16_t fport = fport_arg, lport = lport_arg; int errno; int nmatch = 0; u_int32_t flowinfo; if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) return 0; sa6_dst = (const struct sockaddr_in6 *)dst; if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) return 0; /* * note that src can be NULL when we get notify by local fragmentation. */ sa6_src = (src == NULL) ? sa6_any : *(const struct sockaddr_in6 *)src; flowinfo = sa6_src.sin6_flowinfo; /* * Redirects go to all references to the destination, * and use in6_rtchange to invalidate the route cache. * Dead host indications: also use in6_rtchange to invalidate * the cache, and deliver the error to all the sockets. * Otherwise, if we have knowledge of the local port and address, * deliver only to that socket. */ if (PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { fport = 0; lport = 0; memset((void *)&sa6_src.sin6_addr, 0, sizeof(sa6_src.sin6_addr)); if (cmd != PRC_HOSTDEAD) notify = in6_rtchange; } errno = inet6ctlerrmap[cmd]; TAILQ_FOREACH_SAFE(inph, &table->inpt_queue, inph_queue, ninph) { struct in6pcb *in6p = (struct in6pcb *)inph; if (in6p->in6p_af != AF_INET6) continue; /* * Under the following condition, notify of redirects * to the pcb, without making address matches against inpcb. * - redirect notification is arrived. * - the inpcb is unconnected. * - the inpcb is caching !RTF_HOST routing entry. * - the ICMPv6 notification is from the gateway cached in the * inpcb. i.e. ICMPv6 notification is from nexthop gateway * the inpcb used very recently. * * This is to improve interaction between netbsd/openbsd * redirect handling code, and inpcb route cache code. * without the clause, !RTF_HOST routing entry (which carries * gateway used by inpcb right before the ICMPv6 redirect) * will be cached forever in unconnected inpcb. * * There still is a question regarding to what is TRT: * - On bsdi/freebsd, RTF_HOST (cloned) routing entry will be * generated on packet output. inpcb will always cache * RTF_HOST routing entry so there's no need for the clause * (ICMPv6 redirect will update RTF_HOST routing entry, * and inpcb is caching it already). * However, bsdi/freebsd are vulnerable to local DoS attacks * due to the cloned routing entries. * - Specwise, "destination cache" is mentioned in RFC2461. * Jinmei says that it implies bsdi/freebsd behavior, itojun * is not really convinced. * - Having hiwat/lowat on # of cloned host route (redirect/ * pmtud) may be a good idea. netbsd/openbsd has it. see * icmp6_mtudisc_update(). */ if ((PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) && IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && (rt = rtcache_validate(&in6p->in6p_route)) != NULL && !(rt->rt_flags & RTF_HOST)) { const struct sockaddr_in6 *dst6; dst6 = (const struct sockaddr_in6 *) rtcache_getdst(&in6p->in6p_route); if (dst6 == NULL) ; else if (IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &sa6_dst->sin6_addr)) goto do_notify; } /* * If the error designates a new path MTU for a destination * and the application (associated with this socket) wanted to * know the value, notify. Note that we notify for all * disconnected sockets if the corresponding application * wanted. This is because some UDP applications keep sending * sockets disconnected. * XXX: should we avoid to notify the value to TCP sockets? */ if (cmd == PRC_MSGSIZE && (in6p->in6p_flags & IN6P_MTU) != 0 && (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) || IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &sa6_dst->sin6_addr))) { ip6_notify_pmtu(in6p, (const struct sockaddr_in6 *)dst, (u_int32_t *)cmdarg); } /* * Detect if we should notify the error. If no source and * destination ports are specified, but non-zero flowinfo and * local address match, notify the error. This is the case * when the error is delivered with an encrypted buffer * by ESP. Otherwise, just compare addresses and ports * as usual. */ if (lport == 0 && fport == 0 && flowinfo && in6p->in6p_socket != NULL && flowinfo == (in6p->in6p_flowinfo & IPV6_FLOWLABEL_MASK) && IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &sa6_src.sin6_addr)) goto do_notify; else if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &sa6_dst->sin6_addr) || in6p->in6p_socket == NULL || (lport && in6p->in6p_lport != lport) || (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &sa6_src.sin6_addr)) || (fport && in6p->in6p_fport != fport)) continue; do_notify: if (notify) (*notify)(in6p, errno); nmatch++; } return nmatch; } void in6_pcbpurgeif0(struct inpcbtable *table, struct ifnet *ifp) { struct inpcb_hdr *inph, *ninph; struct ip6_moptions *im6o; struct in6_multi_mship *imm, *nimm; TAILQ_FOREACH_SAFE(inph, &table->inpt_queue, inph_queue, ninph) { struct in6pcb *in6p = (struct in6pcb *)inph; if (in6p->in6p_af != AF_INET6) continue; im6o = in6p->in6p_moptions; if (im6o) { /* * Unselect the outgoing interface if it is being * detached. */ if (im6o->im6o_multicast_ifp == ifp) im6o->im6o_multicast_ifp = NULL; /* * Drop multicast group membership if we joined * through the interface being detached. * XXX controversial - is it really legal for kernel * to force this? */ for (imm = im6o->im6o_memberships.lh_first; imm != NULL; imm = nimm) { nimm = imm->i6mm_chain.le_next; if (imm->i6mm_maddr->in6m_ifp == ifp) { LIST_REMOVE(imm, i6mm_chain); in6_leavegroup(imm); } } } in_purgeifmcast(in6p->in6p_v4moptions, ifp); } } void in6_pcbpurgeif(struct inpcbtable *table, struct ifnet *ifp) { struct rtentry *rt; struct inpcb_hdr *inph, *ninph; TAILQ_FOREACH_SAFE(inph, &table->inpt_queue, inph_queue, ninph) { struct in6pcb *in6p = (struct in6pcb *)inph; if (in6p->in6p_af != AF_INET6) continue; if ((rt = rtcache_validate(&in6p->in6p_route)) != NULL && rt->rt_ifp == ifp) in6_rtchange(in6p, 0); } } /* * Check for alternatives when higher level complains * about service problems. For now, invalidate cached * routing information. If the route was created dynamically * (by a redirect), time to try a default gateway again. */ void in6_losing(struct in6pcb *in6p) { struct rtentry *rt; struct rt_addrinfo info; if (in6p->in6p_af != AF_INET6) return; if ((rt = rtcache_validate(&in6p->in6p_route)) == NULL) return; memset(&info, 0, sizeof(info)); info.rti_info[RTAX_DST] = rtcache_getdst(&in6p->in6p_route); info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; info.rti_info[RTAX_NETMASK] = rt_mask(rt); rt_missmsg(RTM_LOSING, &info, rt->rt_flags, 0); if (rt->rt_flags & RTF_DYNAMIC) { (void)rtrequest(RTM_DELETE, rt_getkey(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); } /* * A new route can be allocated * the next time output is attempted. */ rtcache_free(&in6p->in6p_route); } /* * After a routing change, flush old routing. A new route can be * allocated the next time output is attempted. */ void in6_rtchange(struct in6pcb *in6p, int errno) { if (in6p->in6p_af != AF_INET6) return; rtcache_free(&in6p->in6p_route); /* * A new route can be allocated the next time * output is attempted. */ } struct in6pcb * in6_pcblookup_port(struct inpcbtable *table, struct in6_addr *laddr6, u_int lport_arg, int lookup_wildcard, struct vestigial_inpcb *vp) { struct inpcbhead *head; struct inpcb_hdr *inph; struct in6pcb *in6p, *match = NULL; int matchwild = 3, wildcard; u_int16_t lport = lport_arg; if (vp) vp->valid = 0; head = IN6PCBHASH_PORT(table, lport); LIST_FOREACH(inph, head, inph_lhash) { in6p = (struct in6pcb *)inph; if (in6p->in6p_af != AF_INET6) continue; if (in6p->in6p_lport != lport) continue; wildcard = 0; if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) { if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) continue; } if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) wildcard++; if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr)) { if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) continue; if (!IN6_IS_ADDR_V4MAPPED(laddr6)) continue; /* duplicate of IPv4 logic */ wildcard = 0; if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr) && in6p->in6p_faddr.s6_addr32[3]) wildcard++; if (!in6p->in6p_laddr.s6_addr32[3]) { if (laddr6->s6_addr32[3]) wildcard++; } else { if (!laddr6->s6_addr32[3]) wildcard++; else { if (in6p->in6p_laddr.s6_addr32[3] != laddr6->s6_addr32[3]) continue; } } } else if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { if (IN6_IS_ADDR_V4MAPPED(laddr6)) { if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) continue; } if (!IN6_IS_ADDR_UNSPECIFIED(laddr6)) wildcard++; } else { if (IN6_IS_ADDR_V4MAPPED(laddr6)) { if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) continue; } if (IN6_IS_ADDR_UNSPECIFIED(laddr6)) wildcard++; else { if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) continue; } } if (wildcard && !lookup_wildcard) continue; if (wildcard < matchwild) { match = in6p; matchwild = wildcard; if (matchwild == 0) break; } } if (match && matchwild == 0) return match; if (vp && table->vestige && table->vestige->init_ports6) { struct vestigial_inpcb better; void *state; state = (*table->vestige->init_ports6)(laddr6, lport_arg, lookup_wildcard); while (table->vestige && (*table->vestige->next_port6)(state, vp)) { if (vp->lport != lport) continue; wildcard = 0; if (!IN6_IS_ADDR_UNSPECIFIED(&vp->faddr.v6)) wildcard++; if (IN6_IS_ADDR_UNSPECIFIED(&vp->laddr.v6)) { if (!IN6_IS_ADDR_UNSPECIFIED(laddr6)) wildcard++; } else { if (IN6_IS_ADDR_V4MAPPED(laddr6)) { if (vp->v6only) continue; } if (IN6_IS_ADDR_UNSPECIFIED(laddr6)) wildcard++; else { if (!IN6_ARE_ADDR_EQUAL(&vp->laddr.v6, laddr6)) continue; } } if (wildcard && !lookup_wildcard) continue; if (wildcard < matchwild) { better = *vp; match = (void*)&better; matchwild = wildcard; if (matchwild == 0) break; } } if (match) { if (match != (void*)&better) return match; else { *vp = better; return 0; } } } return (match); } /* * WARNING: return value (rtentry) could be IPv4 one if in6pcb is connected to * IPv4 mapped address. */ struct rtentry * in6_pcbrtentry(struct in6pcb *in6p) { struct rtentry *rt; struct route *ro; union { const struct sockaddr *sa; const struct sockaddr_in6 *sa6; #ifdef INET const struct sockaddr_in *sa4; #endif } cdst; ro = &in6p->in6p_route; if (in6p->in6p_af != AF_INET6) return (NULL); cdst.sa = rtcache_getdst(ro); if (cdst.sa == NULL) ; #ifdef INET else if (cdst.sa->sa_family == AF_INET) { KASSERT(IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)); if (cdst.sa4->sin_addr.s_addr != in6p->in6p_faddr.s6_addr32[3]) rtcache_free(ro); } #endif else { if (!IN6_ARE_ADDR_EQUAL(&cdst.sa6->sin6_addr, &in6p->in6p_faddr)) rtcache_free(ro); } if ((rt = rtcache_validate(ro)) == NULL) rt = rtcache_update(ro, 1); #ifdef INET if (rt == NULL && IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) { union { struct sockaddr dst; struct sockaddr_in dst4; } u; struct in_addr addr; addr.s_addr = in6p->in6p_faddr.s6_addr32[3]; sockaddr_in_init(&u.dst4, &addr, 0); if (rtcache_setdst(ro, &u.dst) != 0) return NULL; rt = rtcache_init(ro); } else #endif if (rt == NULL && !IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { union { struct sockaddr dst; struct sockaddr_in6 dst6; } u; sockaddr_in6_init(&u.dst6, &in6p->in6p_faddr, 0, 0, 0); if (rtcache_setdst(ro, &u.dst) != 0) return NULL; rt = rtcache_init(ro); } return rt; } struct in6pcb * in6_pcblookup_connect(struct inpcbtable *table, const struct in6_addr *faddr6, u_int fport_arg, const struct in6_addr *laddr6, u_int lport_arg, int faith, struct vestigial_inpcb *vp) { struct inpcbhead *head; struct inpcb_hdr *inph; struct in6pcb *in6p; u_int16_t fport = fport_arg, lport = lport_arg; if (vp) vp->valid = 0; head = IN6PCBHASH_CONNECT(table, faddr6, fport, laddr6, lport); LIST_FOREACH(inph, head, inph_hash) { in6p = (struct in6pcb *)inph; if (in6p->in6p_af != AF_INET6) continue; /* find exact match on both source and dest */ if (in6p->in6p_fport != fport) continue; if (in6p->in6p_lport != lport) continue; if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) continue; if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, faddr6)) continue; if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) continue; if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) continue; if ((IN6_IS_ADDR_V4MAPPED(laddr6) || IN6_IS_ADDR_V4MAPPED(faddr6)) && (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) continue; return in6p; } if (vp && table->vestige) { if ((*table->vestige->lookup6)(faddr6, fport_arg, laddr6, lport_arg, vp)) return NULL; } return NULL; } struct in6pcb * in6_pcblookup_bind(struct inpcbtable *table, const struct in6_addr *laddr6, u_int lport_arg, int faith) { struct inpcbhead *head; struct inpcb_hdr *inph; struct in6pcb *in6p; u_int16_t lport = lport_arg; #ifdef INET struct in6_addr zero_mapped; #endif head = IN6PCBHASH_BIND(table, laddr6, lport); LIST_FOREACH(inph, head, inph_hash) { in6p = (struct in6pcb *)inph; if (in6p->in6p_af != AF_INET6) continue; if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) continue; if (in6p->in6p_fport != 0) continue; if (in6p->in6p_lport != lport) continue; if (IN6_IS_ADDR_V4MAPPED(laddr6) && (in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) continue; if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, laddr6)) goto out; } #ifdef INET if (IN6_IS_ADDR_V4MAPPED(laddr6)) { memset(&zero_mapped, 0, sizeof(zero_mapped)); zero_mapped.s6_addr16[5] = 0xffff; head = IN6PCBHASH_BIND(table, &zero_mapped, lport); LIST_FOREACH(inph, head, inph_hash) { in6p = (struct in6pcb *)inph; if (in6p->in6p_af != AF_INET6) continue; if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) continue; if (in6p->in6p_fport != 0) continue; if (in6p->in6p_lport != lport) continue; if ((in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) continue; if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &zero_mapped)) goto out; } } #endif head = IN6PCBHASH_BIND(table, &zeroin6_addr, lport); LIST_FOREACH(inph, head, inph_hash) { in6p = (struct in6pcb *)inph; if (in6p->in6p_af != AF_INET6) continue; if (faith && (in6p->in6p_flags & IN6P_FAITH) == 0) continue; if (in6p->in6p_fport != 0) continue; if (in6p->in6p_lport != lport) continue; if (IN6_IS_ADDR_V4MAPPED(laddr6) && (in6p->in6p_flags & IN6P_IPV6_V6ONLY) != 0) continue; if (IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &zeroin6_addr)) goto out; } return (NULL); out: inph = &in6p->in6p_head; if (inph != LIST_FIRST(head)) { LIST_REMOVE(inph, inph_hash); LIST_INSERT_HEAD(head, inph, inph_hash); } return in6p; } void in6_pcbstate(struct in6pcb *in6p, int state) { if (in6p->in6p_af != AF_INET6) return; if (in6p->in6p_state > IN6P_ATTACHED) LIST_REMOVE(&in6p->in6p_head, inph_hash); switch (state) { case IN6P_BOUND: LIST_INSERT_HEAD(IN6PCBHASH_BIND(in6p->in6p_table, &in6p->in6p_laddr, in6p->in6p_lport), &in6p->in6p_head, inph_hash); break; case IN6P_CONNECTED: LIST_INSERT_HEAD(IN6PCBHASH_CONNECT(in6p->in6p_table, &in6p->in6p_faddr, in6p->in6p_fport, &in6p->in6p_laddr, in6p->in6p_lport), &in6p->in6p_head, inph_hash); break; } in6p->in6p_state = state; }