/* $NetBSD: in_pcb.c,v 1.178.4.3 2018/03/18 10:57:01 martin 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) 1998, 2011 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Coyote Point Systems, Inc. * This code is derived from software contributed to The NetBSD Foundation * by Public Access Networks Corporation ("Panix"). It was developed under * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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, 1995 * 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 8.4 (Berkeley) 5/24/95 */ #include __KERNEL_RCSID(0, "$NetBSD: in_pcb.c,v 1.178.4.3 2018/03/18 10:57:01 martin 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 #ifdef INET6 #include #include #include #endif #ifdef IPSEC #include #include #endif /* IPSEC */ #include struct in_addr zeroin_addr; #define INPCBHASH_PORT(table, lport) \ &(table)->inpt_porthashtbl[ntohs(lport) & (table)->inpt_porthash] #define INPCBHASH_BIND(table, laddr, lport) \ &(table)->inpt_bindhashtbl[ \ ((ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_bindhash] #define INPCBHASH_CONNECT(table, faddr, fport, laddr, lport) \ &(table)->inpt_connecthashtbl[ \ ((ntohl((faddr).s_addr) + ntohs(fport)) + \ (ntohl((laddr).s_addr) + ntohs(lport))) & (table)->inpt_connecthash] int anonportmin = IPPORT_ANONMIN; int anonportmax = IPPORT_ANONMAX; int lowportmin = IPPORT_RESERVEDMIN; int lowportmax = IPPORT_RESERVEDMAX; static struct pool inpcb_pool; static int inpcb_poolinit(void) { pool_init(&inpcb_pool, sizeof(struct inpcb), 0, 0, 0, "inpcbpl", NULL, IPL_NET); return 0; } void in_pcbinit(struct inpcbtable *table, int bindhashsize, int connecthashsize) { static ONCE_DECL(control); TAILQ_INIT(&table->inpt_queue); table->inpt_porthashtbl = hashinit(bindhashsize, HASH_LIST, true, &table->inpt_porthash); table->inpt_bindhashtbl = hashinit(bindhashsize, HASH_LIST, true, &table->inpt_bindhash); table->inpt_connecthashtbl = hashinit(connecthashsize, HASH_LIST, true, &table->inpt_connecthash); table->inpt_lastlow = IPPORT_RESERVEDMAX; table->inpt_lastport = (u_int16_t)anonportmax; RUN_ONCE(&control, inpcb_poolinit); } int in_pcballoc(struct socket *so, void *v) { struct inpcbtable *table = v; struct inpcb *inp; int s; KASSERT(so->so_proto->pr_domain->dom_family == AF_INET); inp = pool_get(&inpcb_pool, PR_NOWAIT); if (inp == NULL) return (ENOBUFS); memset(inp, 0, sizeof(*inp)); inp->inp_af = AF_INET; inp->inp_table = table; inp->inp_socket = so; inp->inp_errormtu = -1; inp->inp_portalgo = PORTALGO_DEFAULT; inp->inp_bindportonsend = false; inp->inp_prefsrcip.s_addr = INADDR_ANY; #if defined(IPSEC) if (ipsec_enabled) { int error = ipsec_init_pcbpolicy(so, &inp->inp_sp); if (error != 0) { pool_put(&inpcb_pool, inp); return error; } inp->inp_sp->sp_inph = (struct inpcb_hdr *)inp; } #endif so->so_pcb = inp; s = splsoftnet(); TAILQ_INSERT_HEAD(&table->inpt_queue, &inp->inp_head, inph_queue); LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head, inph_lhash); in_pcbstate(inp, INP_ATTACHED); splx(s); return (0); } static int in_pcbsetport(struct sockaddr_in *sin, struct inpcb *inp, kauth_cred_t cred) { struct inpcbtable *table = inp->inp_table; struct socket *so = inp->inp_socket; u_int16_t *lastport; u_int16_t lport = 0; enum kauth_network_req req; int error; if (inp->inp_flags & INP_LOWPORT) { #ifndef IPNOPRIVPORTS req = KAUTH_REQ_NETWORK_BIND_PRIVPORT; #else req = KAUTH_REQ_NETWORK_BIND_PORT; #endif lastport = &table->inpt_lastlow; } else { req = KAUTH_REQ_NETWORK_BIND_PORT; lastport = &table->inpt_lastport; } /* XXX-kauth: KAUTH_REQ_NETWORK_BIND_AUTOASSIGN_{,PRIV}PORT */ error = kauth_authorize_network(cred, KAUTH_NETWORK_BIND, req, so, sin, NULL); if (error) return (EACCES); /* * Use RFC6056 randomized port selection */ error = portalgo_randport(&lport, &inp->inp_head, cred); if (error) return error; inp->inp_flags |= INP_ANONPORT; *lastport = lport; lport = htons(lport); inp->inp_lport = lport; in_pcbstate(inp, INP_BOUND); return (0); } int in_pcbbindableaddr(struct sockaddr_in *sin, kauth_cred_t cred) { int error = EADDRNOTAVAIL; struct ifaddr *ifa = NULL; int s; if (sin->sin_family != AF_INET) return (EAFNOSUPPORT); s = pserialize_read_enter(); if (IN_MULTICAST(sin->sin_addr.s_addr)) { /* Always succeed; port reuse handled in in_pcbbind_port(). */ } else if (!in_nullhost(sin->sin_addr)) { struct in_ifaddr *ia; ia = in_get_ia(sin->sin_addr); /* check for broadcast addresses */ if (ia == NULL) { ifa = ifa_ifwithaddr(sintosa(sin)); if (ifa != NULL) ia = ifatoia(ifa); } if (ia == NULL) goto error; if (ia->ia4_flags & IN_IFF_DUPLICATED) goto error; } error = 0; error: pserialize_read_exit(s); return error; } static int in_pcbbind_addr(struct inpcb *inp, struct sockaddr_in *sin, kauth_cred_t cred) { int error; error = in_pcbbindableaddr(sin, cred); if (error == 0) inp->inp_laddr = sin->sin_addr; return error; } static int in_pcbbind_port(struct inpcb *inp, struct sockaddr_in *sin, kauth_cred_t cred) { struct inpcbtable *table = inp->inp_table; struct socket *so = inp->inp_socket; int reuseport = (so->so_options & SO_REUSEPORT); int wild = 0, error; if (IN_MULTICAST(sin->sin_addr.s_addr)) { /* * Treat SO_REUSEADDR as SO_REUSEPORT for multicast; * allow complete 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 (sin->sin_port == 0) { error = in_pcbsetport(sin, inp, cred); if (error) return (error); } else { struct inpcb *t; vestigial_inpcb_t vestige; #ifdef INET6 struct in6pcb *t6; struct in6_addr mapped; #endif enum kauth_network_req req; if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0) wild = 1; #ifndef IPNOPRIVPORTS if (ntohs(sin->sin_port) < IPPORT_RESERVED) req = KAUTH_REQ_NETWORK_BIND_PRIVPORT; else #endif /* !IPNOPRIVPORTS */ req = KAUTH_REQ_NETWORK_BIND_PORT; error = kauth_authorize_network(cred, KAUTH_NETWORK_BIND, req, so, sin, NULL); if (error) return (EACCES); #ifdef INET6 in6_in_2_v4mapin6(&sin->sin_addr, &mapped); t6 = in6_pcblookup_port(table, &mapped, sin->sin_port, wild, &vestige); if (t6 && (reuseport & t6->in6p_socket->so_options) == 0) return (EADDRINUSE); if (!t6 && vestige.valid) { if (!!reuseport != !!vestige.reuse_port) { return EADDRINUSE; } } #endif /* XXX-kauth */ if (so->so_uidinfo->ui_uid && !IN_MULTICAST(sin->sin_addr.s_addr)) { t = in_pcblookup_port(table, sin->sin_addr, sin->sin_port, 1, &vestige); /* * XXX: investigate ramifications of loosening this * restriction so that as long as both ports have * SO_REUSEPORT allow the bind */ if (t && (!in_nullhost(sin->sin_addr) || !in_nullhost(t->inp_laddr) || (t->inp_socket->so_options & SO_REUSEPORT) == 0) && (so->so_uidinfo->ui_uid != t->inp_socket->so_uidinfo->ui_uid)) { return (EADDRINUSE); } if (!t && vestige.valid) { if ((!in_nullhost(sin->sin_addr) || !in_nullhost(vestige.laddr.v4) || !vestige.reuse_port) && so->so_uidinfo->ui_uid != vestige.uid) { return EADDRINUSE; } } } t = in_pcblookup_port(table, sin->sin_addr, sin->sin_port, wild, &vestige); if (t && (reuseport & t->inp_socket->so_options) == 0) return (EADDRINUSE); if (!t && vestige.valid && !(reuseport && vestige.reuse_port)) return EADDRINUSE; inp->inp_lport = sin->sin_port; in_pcbstate(inp, INP_BOUND); } LIST_REMOVE(&inp->inp_head, inph_lhash); LIST_INSERT_HEAD(INPCBHASH_PORT(table, inp->inp_lport), &inp->inp_head, inph_lhash); return (0); } int in_pcbbind(void *v, struct sockaddr_in *sin, struct lwp *l) { struct inpcb *inp = v; struct sockaddr_in lsin; int error; if (inp->inp_af != AF_INET) return (EINVAL); if (IN_ADDRLIST_READER_EMPTY()) return (EADDRNOTAVAIL); if (inp->inp_lport || !in_nullhost(inp->inp_laddr)) return (EINVAL); if (NULL != sin) { if (sin->sin_len != sizeof(*sin)) return (EINVAL); } else { lsin = *((const struct sockaddr_in *) inp->inp_socket->so_proto->pr_domain->dom_sa_any); sin = &lsin; } /* Bind address. */ error = in_pcbbind_addr(inp, sin, l->l_cred); if (error) return (error); /* Bind port. */ error = in_pcbbind_port(inp, sin, l->l_cred); if (error) { inp->inp_laddr.s_addr = INADDR_ANY; return (error); } return (0); } /* * Connect from a socket to a specified address. * Both address and port must be specified in argument sin. * If don't have a local address for this socket yet, * then pick one. */ int in_pcbconnect(void *v, struct sockaddr_in *sin, struct lwp *l) { struct inpcb *inp = v; vestigial_inpcb_t vestige; int error; struct in_addr laddr; if (inp->inp_af != AF_INET) return (EINVAL); if (sin->sin_len != sizeof (*sin)) return (EINVAL); if (sin->sin_family != AF_INET) return (EAFNOSUPPORT); if (sin->sin_port == 0) return (EADDRNOTAVAIL); if (IN_MULTICAST(sin->sin_addr.s_addr) && inp->inp_socket->so_type == SOCK_STREAM) return EADDRNOTAVAIL; if (!IN_ADDRLIST_READER_EMPTY()) { /* * If the destination address is INADDR_ANY, * use any local address (likely loopback). * If the supplied address is INADDR_BROADCAST, * use the broadcast address of an interface * which supports broadcast. (loopback does not) */ if (in_nullhost(sin->sin_addr)) { /* XXX racy */ sin->sin_addr = IN_ADDRLIST_READER_FIRST()->ia_addr.sin_addr; } else if (sin->sin_addr.s_addr == INADDR_BROADCAST) { struct in_ifaddr *ia; int s = pserialize_read_enter(); IN_ADDRLIST_READER_FOREACH(ia) { if (ia->ia_ifp->if_flags & IFF_BROADCAST) { sin->sin_addr = ia->ia_broadaddr.sin_addr; break; } } pserialize_read_exit(s); } } /* * If we haven't bound which network number to use as ours, * we will use the number of the outgoing interface. * This depends on having done a routing lookup, which * we will probably have to do anyway, so we might * as well do it now. On the other hand if we are * sending to multiple destinations we may have already * done the lookup, so see if we can use the route * from before. In any case, we only * chose a port number once, even if sending to multiple * destinations. */ if (in_nullhost(inp->inp_laddr)) { int xerror; struct in_ifaddr *ia, *_ia; int s; struct psref psref; int bound; bound = curlwp_bind(); ia = in_selectsrc(sin, &inp->inp_route, inp->inp_socket->so_options, inp->inp_moptions, &xerror, &psref); if (ia == NULL) { curlwp_bindx(bound); if (xerror == 0) xerror = EADDRNOTAVAIL; return xerror; } s = pserialize_read_enter(); _ia = in_get_ia(IA_SIN(ia)->sin_addr); if (_ia == NULL) { pserialize_read_exit(s); ia4_release(ia, &psref); curlwp_bindx(bound); return (EADDRNOTAVAIL); } pserialize_read_exit(s); laddr = IA_SIN(ia)->sin_addr; ia4_release(ia, &psref); curlwp_bindx(bound); } else laddr = inp->inp_laddr; if (in_pcblookup_connect(inp->inp_table, sin->sin_addr, sin->sin_port, laddr, inp->inp_lport, &vestige) != NULL || vestige.valid) { return (EADDRINUSE); } if (in_nullhost(inp->inp_laddr)) { if (inp->inp_lport == 0) { error = in_pcbbind(inp, NULL, l); /* * This used to ignore the return value * completely, but we need to check for * ephemeral port shortage. * And attempts to request low ports if not root. */ if (error != 0) return (error); } inp->inp_laddr = laddr; } inp->inp_faddr = sin->sin_addr; inp->inp_fport = sin->sin_port; /* Late bind, if needed */ if (inp->inp_bindportonsend) { struct sockaddr_in lsin = *((const struct sockaddr_in *) inp->inp_socket->so_proto->pr_domain->dom_sa_any); lsin.sin_addr = inp->inp_laddr; lsin.sin_port = 0; if ((error = in_pcbbind_port(inp, &lsin, l->l_cred)) != 0) return error; } in_pcbstate(inp, INP_CONNECTED); #if defined(IPSEC) if (ipsec_enabled && inp->inp_socket->so_type == SOCK_STREAM) ipsec_pcbconn(inp->inp_sp); #endif return (0); } void in_pcbdisconnect(void *v) { struct inpcb *inp = v; if (inp->inp_af != AF_INET) return; inp->inp_faddr = zeroin_addr; inp->inp_fport = 0; in_pcbstate(inp, INP_BOUND); #if defined(IPSEC) if (ipsec_enabled) ipsec_pcbdisconn(inp->inp_sp); #endif if (inp->inp_socket->so_state & SS_NOFDREF) in_pcbdetach(inp); } void in_pcbdetach(void *v) { struct inpcb *inp = v; struct socket *so = inp->inp_socket; int s; if (inp->inp_af != AF_INET) return; #if defined(IPSEC) if (ipsec_enabled) ipsec4_delete_pcbpolicy(inp); #endif so->so_pcb = NULL; s = splsoftnet(); in_pcbstate(inp, INP_ATTACHED); LIST_REMOVE(&inp->inp_head, inph_lhash); TAILQ_REMOVE(&inp->inp_table->inpt_queue, &inp->inp_head, inph_queue); splx(s); if (inp->inp_options) { m_free(inp->inp_options); } rtcache_free(&inp->inp_route); ip_freemoptions(inp->inp_moptions); sofree(so); /* drops the socket's lock */ pool_put(&inpcb_pool, inp); mutex_enter(softnet_lock); /* reacquire the softnet_lock */ } void in_setsockaddr(struct inpcb *inp, struct sockaddr_in *sin) { if (inp->inp_af != AF_INET) return; sockaddr_in_init(sin, &inp->inp_laddr, inp->inp_lport); } void in_setpeeraddr(struct inpcb *inp, struct sockaddr_in *sin) { if (inp->inp_af != AF_INET) return; sockaddr_in_init(sin, &inp->inp_faddr, inp->inp_fport); } /* * 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. */ int in_pcbnotify(struct inpcbtable *table, struct in_addr faddr, u_int fport_arg, struct in_addr laddr, u_int lport_arg, int errno, void (*notify)(struct inpcb *, int)) { struct inpcbhead *head; struct inpcb *inp, *ninp; u_int16_t fport = fport_arg, lport = lport_arg; int nmatch; if (in_nullhost(faddr) || notify == 0) return (0); nmatch = 0; head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); for (inp = (struct inpcb *)LIST_FIRST(head); inp != NULL; inp = ninp) { ninp = (struct inpcb *)LIST_NEXT(inp, inp_hash); if (inp->inp_af != AF_INET) continue; if (in_hosteq(inp->inp_faddr, faddr) && inp->inp_fport == fport && inp->inp_lport == lport && in_hosteq(inp->inp_laddr, laddr)) { (*notify)(inp, errno); nmatch++; } } return (nmatch); } void in_pcbnotifyall(struct inpcbtable *table, struct in_addr faddr, int errno, void (*notify)(struct inpcb *, int)) { struct inpcb_hdr *inph, *ninph; if (in_nullhost(faddr) || notify == 0) return; TAILQ_FOREACH_SAFE(inph, &table->inpt_queue, inph_queue, ninph) { struct inpcb *inp = (struct inpcb *)inph; if (inp->inp_af != AF_INET) continue; if (in_hosteq(inp->inp_faddr, faddr)) (*notify)(inp, errno); } } void in_purgeifmcast(struct ip_moptions *imo, struct ifnet *ifp) { int i, gap; /* The owner of imo should be protected by solock */ KASSERT(ifp != NULL); if (imo == NULL) return; /* * Unselect the outgoing interface if it is being * detached. */ if (imo->imo_multicast_if_index == ifp->if_index) imo->imo_multicast_if_index = 0; /* * Drop multicast group membership if we joined * through the interface being detached. */ for (i = 0, gap = 0; i < imo->imo_num_memberships; i++) { if (imo->imo_membership[i]->inm_ifp == ifp) { in_delmulti(imo->imo_membership[i]); gap++; } else if (gap != 0) imo->imo_membership[i - gap] = imo->imo_membership[i]; } imo->imo_num_memberships -= gap; } void in_pcbpurgeif0(struct inpcbtable *table, struct ifnet *ifp) { struct inpcb_hdr *inph, *ninph; TAILQ_FOREACH_SAFE(inph, &table->inpt_queue, inph_queue, ninph) { struct inpcb *inp = (struct inpcb *)inph; bool need_unlock = false; if (inp->inp_af != AF_INET) continue; /* The caller holds either one of inps' lock */ if (!inp_locked(inp)) { inp_lock(inp); need_unlock = true; } /* IFNET_LOCK must be taken after solock */ IFNET_LOCK(ifp); in_purgeifmcast(inp->inp_moptions, ifp); IFNET_UNLOCK(ifp); if (need_unlock) inp_unlock(inp); } } void in_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 inpcb *inp = (struct inpcb *)inph; if (inp->inp_af != AF_INET) continue; if ((rt = rtcache_validate(&inp->inp_route)) != NULL && rt->rt_ifp == ifp) { rtcache_unref(rt, &inp->inp_route); in_rtchange(inp, 0); } else rtcache_unref(rt, &inp->inp_route); } } /* * 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 in_losing(struct inpcb *inp) { struct rtentry *rt; struct rt_addrinfo info; if (inp->inp_af != AF_INET) return; if ((rt = rtcache_validate(&inp->inp_route)) == NULL) return; memset(&info, 0, sizeof(info)); info.rti_info[RTAX_DST] = rtcache_getdst(&inp->inp_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) { int error; struct rtentry *nrt; error = rtrequest(RTM_DELETE, rt_getkey(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, &nrt); rtcache_unref(rt, &inp->inp_route); if (error == 0) rt_free(nrt); } else rtcache_unref(rt, &inp->inp_route); /* * A new route can be allocated * the next time output is attempted. */ rtcache_free(&inp->inp_route); } /* * After a routing change, flush old routing. A new route can be * allocated the next time output is attempted. */ void in_rtchange(struct inpcb *inp, int errno) { if (inp->inp_af != AF_INET) return; rtcache_free(&inp->inp_route); /* XXX SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */ } struct inpcb * in_pcblookup_port(struct inpcbtable *table, struct in_addr laddr, u_int lport_arg, int lookup_wildcard, vestigial_inpcb_t *vp) { struct inpcbhead *head; struct inpcb_hdr *inph; struct inpcb *match = NULL; int matchwild = 3; int wildcard; u_int16_t lport = lport_arg; if (vp) vp->valid = 0; head = INPCBHASH_PORT(table, lport); LIST_FOREACH(inph, head, inph_lhash) { struct inpcb * const inp = (struct inpcb *)inph; if (inp->inp_af != AF_INET) continue; if (inp->inp_lport != lport) continue; /* * check if inp's faddr and laddr match with ours. * our faddr is considered null. * count the number of wildcard matches. (0 - 2) * * null null match * A null wildcard match * null B wildcard match * A B non match * A A match */ wildcard = 0; if (!in_nullhost(inp->inp_faddr)) wildcard++; if (in_nullhost(inp->inp_laddr)) { if (!in_nullhost(laddr)) wildcard++; } else { if (in_nullhost(laddr)) wildcard++; else { if (!in_hosteq(inp->inp_laddr, laddr)) continue; } } if (wildcard && !lookup_wildcard) continue; /* * prefer an address with less wildcards. */ if (wildcard < matchwild) { match = inp; matchwild = wildcard; if (matchwild == 0) break; } } if (match && matchwild == 0) return match; if (vp && table->vestige) { void *state = (*table->vestige->init_ports4)(laddr, lport_arg, lookup_wildcard); vestigial_inpcb_t better; while (table->vestige && (*table->vestige->next_port4)(state, vp)) { if (vp->lport != lport) continue; wildcard = 0; if (!in_nullhost(vp->faddr.v4)) wildcard++; if (in_nullhost(vp->laddr.v4)) { if (!in_nullhost(laddr)) wildcard++; } else { if (in_nullhost(laddr)) wildcard++; else { if (!in_hosteq(vp->laddr.v4, laddr)) 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); } #ifdef DIAGNOSTIC int in_pcbnotifymiss = 0; #endif struct inpcb * in_pcblookup_connect(struct inpcbtable *table, struct in_addr faddr, u_int fport_arg, struct in_addr laddr, u_int lport_arg, vestigial_inpcb_t *vp) { struct inpcbhead *head; struct inpcb_hdr *inph; struct inpcb *inp; u_int16_t fport = fport_arg, lport = lport_arg; if (vp) vp->valid = 0; head = INPCBHASH_CONNECT(table, faddr, fport, laddr, lport); LIST_FOREACH(inph, head, inph_hash) { inp = (struct inpcb *)inph; if (inp->inp_af != AF_INET) continue; if (in_hosteq(inp->inp_faddr, faddr) && inp->inp_fport == fport && inp->inp_lport == lport && in_hosteq(inp->inp_laddr, laddr)) goto out; } if (vp && table->vestige) { if ((*table->vestige->lookup4)(faddr, fport_arg, laddr, lport_arg, vp)) return 0; } #ifdef DIAGNOSTIC if (in_pcbnotifymiss) { printf("in_pcblookup_connect: faddr=%08x fport=%d laddr=%08x lport=%d\n", ntohl(faddr.s_addr), ntohs(fport), ntohl(laddr.s_addr), ntohs(lport)); } #endif return (0); out: /* Move this PCB to the head of hash chain. */ inph = &inp->inp_head; if (inph != LIST_FIRST(head)) { LIST_REMOVE(inph, inph_hash); LIST_INSERT_HEAD(head, inph, inph_hash); } return (inp); } struct inpcb * in_pcblookup_bind(struct inpcbtable *table, struct in_addr laddr, u_int lport_arg) { struct inpcbhead *head; struct inpcb_hdr *inph; struct inpcb *inp; u_int16_t lport = lport_arg; head = INPCBHASH_BIND(table, laddr, lport); LIST_FOREACH(inph, head, inph_hash) { inp = (struct inpcb *)inph; if (inp->inp_af != AF_INET) continue; if (inp->inp_lport == lport && in_hosteq(inp->inp_laddr, laddr)) goto out; } head = INPCBHASH_BIND(table, zeroin_addr, lport); LIST_FOREACH(inph, head, inph_hash) { inp = (struct inpcb *)inph; if (inp->inp_af != AF_INET) continue; if (inp->inp_lport == lport && in_hosteq(inp->inp_laddr, zeroin_addr)) goto out; } #ifdef DIAGNOSTIC if (in_pcbnotifymiss) { printf("in_pcblookup_bind: laddr=%08x lport=%d\n", ntohl(laddr.s_addr), ntohs(lport)); } #endif return (0); out: /* Move this PCB to the head of hash chain. */ inph = &inp->inp_head; if (inph != LIST_FIRST(head)) { LIST_REMOVE(inph, inph_hash); LIST_INSERT_HEAD(head, inph, inph_hash); } return (inp); } void in_pcbstate(struct inpcb *inp, int state) { if (inp->inp_af != AF_INET) return; if (inp->inp_state > INP_ATTACHED) LIST_REMOVE(&inp->inp_head, inph_hash); switch (state) { case INP_BOUND: LIST_INSERT_HEAD(INPCBHASH_BIND(inp->inp_table, inp->inp_laddr, inp->inp_lport), &inp->inp_head, inph_hash); break; case INP_CONNECTED: LIST_INSERT_HEAD(INPCBHASH_CONNECT(inp->inp_table, inp->inp_faddr, inp->inp_fport, inp->inp_laddr, inp->inp_lport), &inp->inp_head, inph_hash); break; } inp->inp_state = state; } struct rtentry * in_pcbrtentry(struct inpcb *inp) { struct route *ro; union { struct sockaddr dst; struct sockaddr_in dst4; } u; if (inp->inp_af != AF_INET) return (NULL); ro = &inp->inp_route; sockaddr_in_init(&u.dst4, &inp->inp_faddr, 0); return rtcache_lookup(ro, &u.dst); } void in_pcbrtentry_unref(struct rtentry *rt, struct inpcb *inp) { rtcache_unref(rt, &inp->inp_route); }