/* $OpenBSD: in_pcb.c,v 1.175 2015/09/01 21:24:04 bluhm Exp $ */ /* $NetBSD: in_pcb.c,v 1.25 1996/02/13 23:41:53 christos Exp $ */ /* * 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. * * @(#)COPYRIGHT 1.1 (NRL) 17 January 1995 * * NRL grants permission for redistribution and use in source and binary * forms, with or without modification, of the software and documentation * created at NRL 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. All advertising materials mentioning features or use of this software * must display the following acknowledgements: * This product includes software developed by the University of * California, Berkeley and its contributors. * This product includes software developed at the Information * Technology Division, US Naval Research Laboratory. * 4. Neither the name of the NRL nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THE SOFTWARE PROVIDED BY NRL IS PROVIDED BY NRL 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 NRL 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. * * The views and conclusions contained in the software and documentation * are those of the authors and should not be interpreted as representing * official policies, either expressed or implied, of the US Naval * Research Laboratory (NRL). */ #include "pf.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET6 #include #include #endif /* INET6 */ #ifdef IPSEC #include #endif /* IPSEC */ struct in_addr zeroin_addr; /* * These configure the range of local port addresses assigned to * "unspecified" outgoing connections/packets/whatever. */ int ipport_firstauto = IPPORT_RESERVED; int ipport_lastauto = IPPORT_USERRESERVED; int ipport_hifirstauto = IPPORT_HIFIRSTAUTO; int ipport_hilastauto = IPPORT_HILASTAUTO; struct baddynamicports baddynamicports; struct pool inpcb_pool; int inpcb_pool_initialized = 0; int in_pcbresize (struct inpcbtable *, int); #define INPCBHASH_LOADFACTOR(_x) (((_x) * 3) / 4) struct inpcbhead *in_pcbhash(struct inpcbtable *, int, const struct in_addr *, u_short, const struct in_addr *, u_short); struct inpcbhead *in6_pcbhash(struct inpcbtable *, int, const struct in6_addr *, u_short, const struct in6_addr *, u_short); struct inpcbhead *in_pcblhash(struct inpcbtable *, int, u_short); struct inpcbhead * in_pcbhash(struct inpcbtable *table, int rdom, const struct in_addr *faddr, u_short fport, const struct in_addr *laddr, u_short lport) { SIPHASH_CTX ctx; u_int32_t nrdom = htonl(rdom); SipHash24_Init(&ctx, &table->inpt_key); SipHash24_Update(&ctx, &nrdom, sizeof(nrdom)); SipHash24_Update(&ctx, faddr, sizeof(*faddr)); SipHash24_Update(&ctx, &fport, sizeof(fport)); SipHash24_Update(&ctx, laddr, sizeof(*laddr)); SipHash24_Update(&ctx, &lport, sizeof(lport)); return (&table->inpt_hashtbl[SipHash24_End(&ctx) & table->inpt_hash]); } #define INPCBHASH(table, faddr, fport, laddr, lport, rdom) \ in_pcbhash(table, rdom, faddr, fport, laddr, lport) struct inpcbhead * in6_pcbhash(struct inpcbtable *table, int rdom, const struct in6_addr *faddr, u_short fport, const struct in6_addr *laddr, u_short lport) { SIPHASH_CTX ctx; u_int32_t nrdom = htonl(rdom); SipHash24_Init(&ctx, &table->inpt_key); SipHash24_Update(&ctx, &nrdom, sizeof(nrdom)); SipHash24_Update(&ctx, faddr, sizeof(*faddr)); SipHash24_Update(&ctx, &fport, sizeof(fport)); SipHash24_Update(&ctx, laddr, sizeof(*laddr)); SipHash24_Update(&ctx, &lport, sizeof(lport)); return (&table->inpt_hashtbl[SipHash24_End(&ctx) & table->inpt_hash]); } #define IN6PCBHASH(table, faddr, fport, laddr, lport, rdom) \ in6_pcbhash(table, rdom, faddr, fport, laddr, lport) struct inpcbhead * in_pcblhash(struct inpcbtable *table, int rdom, u_short lport) { SIPHASH_CTX ctx; u_int32_t nrdom = htonl(rdom); SipHash24_Init(&ctx, &table->inpt_key); SipHash24_Update(&ctx, &nrdom, sizeof(nrdom)); SipHash24_Update(&ctx, &lport, sizeof(lport)); return (&table->inpt_lhashtbl[SipHash24_End(&ctx) & table->inpt_lhash]); } #define INPCBLHASH(table, lport, rdom) in_pcblhash(table, rdom, lport) void in_pcbinit(struct inpcbtable *table, int hashsize) { TAILQ_INIT(&table->inpt_queue); table->inpt_hashtbl = hashinit(hashsize, M_PCB, M_NOWAIT, &table->inpt_hash); if (table->inpt_hashtbl == NULL) panic("in_pcbinit: hashinit failed"); table->inpt_lhashtbl = hashinit(hashsize, M_PCB, M_NOWAIT, &table->inpt_lhash); if (table->inpt_lhashtbl == NULL) panic("in_pcbinit: hashinit failed for lport"); table->inpt_lastport = 0; table->inpt_count = 0; arc4random_buf(&table->inpt_key, sizeof(table->inpt_key)); } /* * Check if the specified port is invalid for dynamic allocation. */ int in_baddynamic(u_int16_t port, u_int16_t proto) { switch (proto) { case IPPROTO_TCP: return (DP_ISSET(baddynamicports.tcp, port)); case IPPROTO_UDP: #ifdef IPSEC /* Cannot preset this as it is a sysctl */ if (port == udpencap_port) return (1); #endif return (DP_ISSET(baddynamicports.udp, port)); default: return (0); } } int in_pcballoc(struct socket *so, struct inpcbtable *table) { struct inpcb *inp; int s; struct inpcbhead *head; splsoftassert(IPL_SOFTNET); if (inpcb_pool_initialized == 0) { pool_init(&inpcb_pool, sizeof(struct inpcb), 0, 0, 0, "inpcbpl", NULL); inpcb_pool_initialized = 1; } inp = pool_get(&inpcb_pool, PR_NOWAIT|PR_ZERO); if (inp == NULL) return (ENOBUFS); inp->inp_table = table; inp->inp_socket = so; inp->inp_seclevel[SL_AUTH] = IPSEC_AUTH_LEVEL_DEFAULT; inp->inp_seclevel[SL_ESP_TRANS] = IPSEC_ESP_TRANS_LEVEL_DEFAULT; inp->inp_seclevel[SL_ESP_NETWORK] = IPSEC_ESP_NETWORK_LEVEL_DEFAULT; inp->inp_seclevel[SL_IPCOMP] = IPSEC_IPCOMP_LEVEL_DEFAULT; inp->inp_rtableid = curproc->p_p->ps_rtableid; s = splnet(); if (table->inpt_hash != 0 && table->inpt_count++ > INPCBHASH_LOADFACTOR(table->inpt_hash)) (void)in_pcbresize(table, (table->inpt_hash + 1) * 2); TAILQ_INSERT_HEAD(&table->inpt_queue, inp, inp_queue); head = INPCBLHASH(table, inp->inp_lport, inp->inp_rtableid); LIST_INSERT_HEAD(head, inp, inp_lhash); head = INPCBHASH(table, &inp->inp_faddr, inp->inp_fport, &inp->inp_laddr, inp->inp_lport, rtable_l2(inp->inp_rtableid)); LIST_INSERT_HEAD(head, inp, inp_hash); splx(s); so->so_pcb = inp; inp->inp_hops = -1; #ifdef INET6 /* * Small change in this function to set the INP_IPV6 flag so routines * outside pcb-specific routines don't need to use sotopf(), and all * of its pointer chasing, later. */ if (sotopf(so) == PF_INET6) inp->inp_flags = INP_IPV6; inp->inp_cksum6 = -1; #endif /* INET6 */ return (0); } int in_pcbbind(struct inpcb *inp, struct mbuf *nam, struct proc *p) { struct socket *so = inp->inp_socket; struct inpcbtable *table = inp->inp_table; u_int16_t *lastport = &inp->inp_table->inpt_lastport; struct sockaddr_in *sin; u_int16_t lport = 0; int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); int error; #ifdef INET6 if (sotopf(so) == PF_INET6) return in6_pcbbind(inp, nam, p); #endif /* INET6 */ if (inp->inp_lport || inp->inp_laddr.s_addr != INADDR_ANY) return (EINVAL); if ((so->so_options & (SO_REUSEADDR|SO_REUSEPORT)) == 0 && ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 || (so->so_options & SO_ACCEPTCONN) == 0)) wild = INPLOOKUP_WILDCARD; if (nam) { sin = mtod(nam, struct sockaddr_in *); if (nam->m_len != sizeof(*sin)) return (EINVAL); #ifdef notdef /* * We should check the family, but old programs * incorrectly fail to initialize it. */ if (sin->sin_family != AF_INET) return (EAFNOSUPPORT); #endif lport = sin->sin_port; 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) reuseport = SO_REUSEADDR|SO_REUSEPORT; } else if (sin->sin_addr.s_addr != INADDR_ANY) { sin->sin_port = 0; /* yech... */ /* ... must also clear the zeropad in the sockaddr */ memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); if (!((so->so_options & SO_BINDANY) || (sin->sin_addr.s_addr == INADDR_BROADCAST && so->so_type == SOCK_DGRAM))) { struct in_ifaddr *ia; ia = ifatoia(ifa_ifwithaddr(sintosa(sin), inp->inp_rtableid)); if (ia == NULL) return (EADDRNOTAVAIL); /* SOCK_RAW does not use in_pcbbind() */ if (so->so_type != SOCK_DGRAM && sin->sin_addr.s_addr != ia->ia_addr.sin_addr.s_addr) return (EADDRNOTAVAIL); } } if (lport) { struct inpcb *t; /* GROSS */ if (ntohs(lport) < IPPORT_RESERVED && (error = suser(p, 0))) return (EACCES); if (so->so_euid) { t = in_pcblookup(table, &zeroin_addr, 0, &sin->sin_addr, lport, INPLOOKUP_WILDCARD, inp->inp_rtableid); if (t && (so->so_euid != t->inp_socket->so_euid)) return (EADDRINUSE); } t = in_pcblookup(table, &zeroin_addr, 0, &sin->sin_addr, lport, wild, inp->inp_rtableid); if (t && (reuseport & t->inp_socket->so_options) == 0) return (EADDRINUSE); } inp->inp_laddr = sin->sin_addr; } if (lport == 0) { u_int16_t first, last; int count; if (inp->inp_flags & INP_HIGHPORT) { first = ipport_hifirstauto; /* sysctl */ last = ipport_hilastauto; } else if (inp->inp_flags & INP_LOWPORT) { if ((error = suser(p, 0))) return (EACCES); first = IPPORT_RESERVED-1; /* 1023 */ last = 600; /* not IPPORT_RESERVED/2 */ } else { first = ipport_firstauto; /* sysctl */ last = ipport_lastauto; } /* * Simple check to ensure all ports are not used up causing * a deadlock here. * * We split the two cases (up and down) so that the direction * is not being tested on each round of the loop. */ if (first > last) { /* * counting down */ count = first - last; if (count) *lastport = first - arc4random_uniform(count); do { if (count-- < 0) /* completely used? */ return (EADDRNOTAVAIL); --*lastport; if (*lastport > first || *lastport < last) *lastport = first; lport = htons(*lastport); } while (in_baddynamic(*lastport, so->so_proto->pr_protocol) || in_pcblookup(table, &zeroin_addr, 0, &inp->inp_laddr, lport, wild, inp->inp_rtableid)); } else { /* * counting up */ count = last - first; if (count) *lastport = first + arc4random_uniform(count); do { if (count-- < 0) /* completely used? */ return (EADDRNOTAVAIL); ++*lastport; if (*lastport < first || *lastport > last) *lastport = first; lport = htons(*lastport); } while (in_baddynamic(*lastport, so->so_proto->pr_protocol) || in_pcblookup(table, &zeroin_addr, 0, &inp->inp_laddr, lport, wild, inp->inp_rtableid)); } } inp->inp_lport = lport; in_pcbrehash(inp); 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(struct inpcb *inp, struct mbuf *nam) { struct in_addr *ina = NULL; struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); struct proc *p = curproc; int error; #ifdef INET6 if (sotopf(inp->inp_socket) == PF_INET6) return (in6_pcbconnect(inp, nam)); if ((inp->inp_flags & INP_IPV6) != 0) panic("IPv6 pcb passed into in_pcbconnect"); #endif /* INET6 */ if (nam->m_len != sizeof(*sin)) return (EINVAL); if (sin->sin_family != AF_INET) return (EAFNOSUPPORT); if (sin->sin_port == 0) return (EADDRNOTAVAIL); if (tame_dns_check(p, sin->sin_port)) return (tame_fail(p, EPERM, TAME_DNS)); error = in_selectsrc(&ina, sin, inp->inp_moptions, &inp->inp_route, &inp->inp_laddr, inp->inp_rtableid); if (error) return (error); if (in_pcbhashlookup(inp->inp_table, sin->sin_addr, sin->sin_port, *ina, inp->inp_lport, inp->inp_rtableid) != 0) return (EADDRINUSE); KASSERT(inp->inp_laddr.s_addr == INADDR_ANY || inp->inp_lport); if (inp->inp_laddr.s_addr == INADDR_ANY) { if (inp->inp_lport == 0 && in_pcbbind(inp, NULL, curproc) == EADDRNOTAVAIL) return (EADDRNOTAVAIL); inp->inp_laddr = *ina; } inp->inp_faddr = sin->sin_addr; inp->inp_fport = sin->sin_port; in_pcbrehash(inp); #ifdef IPSEC { /* Cause an IPsec SA to be established. */ /* error is just ignored */ ipsp_spd_inp(NULL, AF_INET, 0, &error, IPSP_DIRECTION_OUT, NULL, inp, NULL); } #endif return (0); } void in_pcbdisconnect(struct inpcb *inp) { switch (sotopf(inp->inp_socket)) { #ifdef INET6 case PF_INET6: inp->inp_faddr6 = in6addr_any; break; #endif case PF_INET: inp->inp_faddr.s_addr = INADDR_ANY; break; } inp->inp_fport = 0; in_pcbrehash(inp); if (inp->inp_socket->so_state & SS_NOFDREF) in_pcbdetach(inp); } void in_pcbdetach(struct inpcb *inp) { struct socket *so = inp->inp_socket; int s; splsoftassert(IPL_SOFTNET); so->so_pcb = 0; sofree(so); m_freem(inp->inp_options); if (inp->inp_route.ro_rt) rtfree(inp->inp_route.ro_rt); #ifdef INET6 if (inp->inp_flags & INP_IPV6) { ip6_freepcbopts(inp->inp_outputopts6); ip6_freemoptions(inp->inp_moptions6); } else #endif ip_freemoptions(inp->inp_moptions); #if NPF > 0 if (inp->inp_pf_sk) { struct pf_state_key *sk; struct pf_state_item *si; sk = inp->inp_pf_sk; TAILQ_FOREACH(si, &sk->states, entry) if (sk == si->s->key[PF_SK_STACK] && si->s->rule.ptr && si->s->rule.ptr->divert.port) { pf_unlink_state(si->s); break; } /* pf_unlink_state() may have detached the state */ if (inp->inp_pf_sk) inp->inp_pf_sk->inp = NULL; } #endif s = splnet(); LIST_REMOVE(inp, inp_lhash); LIST_REMOVE(inp, inp_hash); TAILQ_REMOVE(&inp->inp_table->inpt_queue, inp, inp_queue); inp->inp_table->inpt_count--; splx(s); pool_put(&inpcb_pool, inp); } void in_setsockaddr(struct inpcb *inp, struct mbuf *nam) { struct sockaddr_in *sin; nam->m_len = sizeof(*sin); sin = mtod(nam, struct sockaddr_in *); memset(sin, 0, sizeof(*sin)); sin->sin_family = AF_INET; sin->sin_len = sizeof(*sin); sin->sin_port = inp->inp_lport; sin->sin_addr = inp->inp_laddr; } void in_setpeeraddr(struct inpcb *inp, struct mbuf *nam) { struct sockaddr_in *sin; #ifdef INET6 if (sotopf(inp->inp_socket) == PF_INET6) { in6_setpeeraddr(inp, nam); return; } #endif /* INET6 */ nam->m_len = sizeof(*sin); sin = mtod(nam, struct sockaddr_in *); memset(sin, 0, sizeof(*sin)); sin->sin_family = AF_INET; sin->sin_len = sizeof(*sin); sin->sin_port = inp->inp_fport; sin->sin_addr = inp->inp_faddr; } /* * Pass some notification to all connections of a protocol * associated with address dst. 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. */ void in_pcbnotifyall(struct inpcbtable *table, struct sockaddr *dst, u_int rdomain, int errno, void (*notify)(struct inpcb *, int)) { struct inpcb *inp, *ninp; struct in_addr faddr; splsoftassert(IPL_SOFTNET); #ifdef INET6 /* * See in6_pcbnotify() for IPv6 codepath. By the time this * gets called, the addresses passed are either definitely IPv4 or * IPv6; *_pcbnotify() never gets called with v4-mapped v6 addresses. */ #endif /* INET6 */ if (dst->sa_family != AF_INET) return; faddr = satosin(dst)->sin_addr; if (faddr.s_addr == INADDR_ANY) return; rdomain = rtable_l2(rdomain); TAILQ_FOREACH_SAFE(inp, &table->inpt_queue, inp_queue, ninp) { #ifdef INET6 if (inp->inp_flags & INP_IPV6) continue; #endif if (inp->inp_faddr.s_addr != faddr.s_addr || rtable_l2(inp->inp_rtableid) != rdomain || inp->inp_socket == 0) { continue; } if (notify) (*notify)(inp, errno); } } /* * 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 ((rt = inp->inp_route.ro_rt)) { inp->inp_route.ro_rt = 0; memset(&info, 0, sizeof(info)); info.rti_flags = rt->rt_flags; info.rti_info[RTAX_DST] = &inp->inp_route.ro_dst; info.rti_info[RTAX_GATEWAY] = rt->rt_gateway; info.rti_info[RTAX_NETMASK] = rt_mask(rt); rt_missmsg(RTM_LOSING, &info, rt->rt_flags, rt->rt_ifp, 0, inp->inp_rtableid); if (rt->rt_flags & RTF_DYNAMIC) (void)rtrequest1(RTM_DELETE, &info, rt->rt_priority, NULL, inp->inp_rtableid); /* * A new route can be allocated * the next time output is attempted. * rtfree() needs to be called in anycase because the inp * is still holding a reference to rt. */ rtfree(rt); } } /* * After a routing change, flush old routing * and allocate a (hopefully) better one. */ void in_rtchange(struct inpcb *inp, int errno) { if (inp->inp_route.ro_rt) { rtfree(inp->inp_route.ro_rt); inp->inp_route.ro_rt = 0; /* * A new route can be allocated the next time * output is attempted. */ } } struct inpcb * in_pcblookup(struct inpcbtable *table, void *faddrp, u_int fport_arg, void *laddrp, u_int lport_arg, int flags, u_int rdomain) { struct inpcb *inp, *match = NULL; int matchwild = 3, wildcard; u_int16_t fport = fport_arg, lport = lport_arg; struct in_addr faddr = *(struct in_addr *)faddrp; struct in_addr laddr = *(struct in_addr *)laddrp; struct inpcbhead *head; rdomain = rtable_l2(rdomain); /* convert passed rtableid to rdomain */ head = INPCBLHASH(table, lport, rdomain); LIST_FOREACH(inp, head, inp_lhash) { if (rtable_l2(inp->inp_rtableid) != rdomain) continue; if (inp->inp_lport != lport) continue; wildcard = 0; #ifdef INET6 if (flags & INPLOOKUP_IPV6) { struct in6_addr *laddr6 = (struct in6_addr *)laddrp; struct in6_addr *faddr6 = (struct in6_addr *)faddrp; if (!(inp->inp_flags & INP_IPV6)) continue; if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) { if (IN6_IS_ADDR_UNSPECIFIED(laddr6)) wildcard++; else if (!IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, laddr6)) continue; } else { if (!IN6_IS_ADDR_UNSPECIFIED(laddr6)) wildcard++; } if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) { if (IN6_IS_ADDR_UNSPECIFIED(faddr6)) wildcard++; else if (!IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, faddr6) || inp->inp_fport != fport) continue; } else { if (!IN6_IS_ADDR_UNSPECIFIED(faddr6)) wildcard++; } } else #endif /* INET6 */ { #ifdef INET6 if (inp->inp_flags & INP_IPV6) continue; #endif /* INET6 */ if (inp->inp_faddr.s_addr != INADDR_ANY) { if (faddr.s_addr == INADDR_ANY) wildcard++; else if (inp->inp_faddr.s_addr != faddr.s_addr || inp->inp_fport != fport) continue; } else { if (faddr.s_addr != INADDR_ANY) wildcard++; } if (inp->inp_laddr.s_addr != INADDR_ANY) { if (laddr.s_addr == INADDR_ANY) wildcard++; else if (inp->inp_laddr.s_addr != laddr.s_addr) continue; } else { if (laddr.s_addr != INADDR_ANY) wildcard++; } } if ((!wildcard || (flags & INPLOOKUP_WILDCARD)) && wildcard < matchwild) { match = inp; if ((matchwild = wildcard) == 0) break; } } return (match); } struct rtentry * in_pcbrtentry(struct inpcb *inp) { struct route *ro; ro = &inp->inp_route; /* check if route is still valid */ if (ro->ro_rt && (ro->ro_rt->rt_flags & RTF_UP) == 0) { rtfree(ro->ro_rt); ro->ro_rt = NULL; } /* * No route yet, so try to acquire one. */ if (ro->ro_rt == NULL) { #ifdef INET6 memset(ro, 0, sizeof(struct route_in6)); #else memset(ro, 0, sizeof(struct route)); #endif switch(sotopf(inp->inp_socket)) { #ifdef INET6 case PF_INET6: if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) break; ro->ro_dst.sa_family = AF_INET6; ro->ro_dst.sa_len = sizeof(struct sockaddr_in6); satosin6(&ro->ro_dst)->sin6_addr = inp->inp_faddr6; ro->ro_tableid = inp->inp_rtableid; ro->ro_rt = rtalloc_mpath(&ro->ro_dst, &inp->inp_laddr6.s6_addr32[0], ro->ro_tableid); break; #endif /* INET6 */ case PF_INET: if (inp->inp_faddr.s_addr == INADDR_ANY) break; ro->ro_dst.sa_family = AF_INET; ro->ro_dst.sa_len = sizeof(struct sockaddr_in); satosin(&ro->ro_dst)->sin_addr = inp->inp_faddr; ro->ro_tableid = inp->inp_rtableid; ro->ro_rt = rtalloc_mpath(&ro->ro_dst, &inp->inp_laddr.s_addr, ro->ro_tableid); break; } } return (ro->ro_rt); } /* * Return an IPv4 address, which is the most appropriate for a given * destination. * If necessary, this function lookups the routing table and returns * an entry to the caller for later use. */ int in_selectsrc(struct in_addr **insrc, struct sockaddr_in *sin, struct ip_moptions *mopts, struct route *ro, struct in_addr *laddr, u_int rtableid) { struct sockaddr_in *sin2; struct in_ifaddr *ia = NULL; /* * If the socket(if any) is already bound, use that bound address * unless it is INADDR_ANY or INADDR_BROADCAST. */ if (laddr && laddr->s_addr != INADDR_ANY && laddr->s_addr != INADDR_BROADCAST) { *insrc = laddr; return (0); } /* * If the destination address is multicast and an outgoing * interface has been set as a multicast option, use the * address of that interface as our source address. */ if (IN_MULTICAST(sin->sin_addr.s_addr) && mopts != NULL) { struct ifnet *ifp; ifp = if_get(mopts->imo_ifidx); if (ifp != NULL) { if (ifp->if_rdomain == rtable_l2(rtableid)) IFP_TO_IA(ifp, ia); if (ia == NULL) return (EADDRNOTAVAIL); *insrc = &ia->ia_addr.sin_addr; return (0); } } /* * If route is known or can be allocated now, * our src addr is taken from the i/f, else punt. */ if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || (satosin(&ro->ro_dst)->sin_addr.s_addr != sin->sin_addr.s_addr))) { rtfree(ro->ro_rt); ro->ro_rt = NULL; } if ((ro->ro_rt == NULL || ro->ro_rt->rt_ifp == NULL)) { /* No route yet, so try to acquire one */ ro->ro_dst.sa_family = AF_INET; ro->ro_dst.sa_len = sizeof(struct sockaddr_in); satosin(&ro->ro_dst)->sin_addr = sin->sin_addr; ro->ro_tableid = rtableid; ro->ro_rt = rtalloc_mpath(&ro->ro_dst, NULL, ro->ro_tableid); /* * It is important to zero out the rest of the * struct sockaddr_in when mixing v6 & v4! */ sin2 = satosin(&ro->ro_dst); memset(sin2->sin_zero, 0, sizeof(sin2->sin_zero)); } /* * If we found a route, use the address * corresponding to the outgoing interface. */ if (ro->ro_rt && ro->ro_rt->rt_ifp) ia = ifatoia(ro->ro_rt->rt_ifa); if (ia == NULL) return (EADDRNOTAVAIL); *insrc = &ia->ia_addr.sin_addr; return (0); } void in_pcbrehash(struct inpcb *inp) { struct inpcbtable *table = inp->inp_table; int s; struct inpcbhead *head; s = splnet(); LIST_REMOVE(inp, inp_lhash); head = INPCBLHASH(table, inp->inp_lport, inp->inp_rtableid); LIST_INSERT_HEAD(head, inp, inp_lhash); LIST_REMOVE(inp, inp_hash); #ifdef INET6 if (inp->inp_flags & INP_IPV6) head = IN6PCBHASH(table, &inp->inp_faddr6, inp->inp_fport, &inp->inp_laddr6, inp->inp_lport, rtable_l2(inp->inp_rtableid)); else #endif /* INET6 */ head = INPCBHASH(table, &inp->inp_faddr, inp->inp_fport, &inp->inp_laddr, inp->inp_lport, rtable_l2(inp->inp_rtableid)); LIST_INSERT_HEAD(head, inp, inp_hash); splx(s); } int in_pcbresize(struct inpcbtable *table, int hashsize) { u_long nhash, nlhash; void *nhashtbl, *nlhashtbl, *ohashtbl, *olhashtbl; struct inpcb *inp0, *inp1; ohashtbl = table->inpt_hashtbl; olhashtbl = table->inpt_lhashtbl; nhashtbl = hashinit(hashsize, M_PCB, M_NOWAIT, &nhash); nlhashtbl = hashinit(hashsize, M_PCB, M_NOWAIT, &nlhash); if (nhashtbl == NULL || nlhashtbl == NULL) { if (nhashtbl != NULL) free(nhashtbl, M_PCB, 0); if (nlhashtbl != NULL) free(nlhashtbl, M_PCB, 0); return (ENOBUFS); } table->inpt_hashtbl = nhashtbl; table->inpt_lhashtbl = nlhashtbl; table->inpt_hash = nhash; table->inpt_lhash = nlhash; arc4random_buf(&table->inpt_key, sizeof(table->inpt_key)); TAILQ_FOREACH_SAFE(inp0, &table->inpt_queue, inp_queue, inp1) { in_pcbrehash(inp0); } free(ohashtbl, M_PCB, 0); free(olhashtbl, M_PCB, 0); return (0); } #ifdef DIAGNOSTIC int in_pcbnotifymiss = 0; #endif /* * The in(6)_pcbhashlookup functions are used to locate connected sockets * quickly: * faddr.fport <-> laddr.lport * No wildcard matching is done so that listening sockets are not found. * If the functions return NULL in(6)_pcblookup_listen can be used to * find a listening/bound socket that may accept the connection. * After those two lookups no other are necessary. */ struct inpcb * in_pcbhashlookup(struct inpcbtable *table, struct in_addr faddr, u_int fport_arg, struct in_addr laddr, u_int lport_arg, u_int rdomain) { struct inpcbhead *head; struct inpcb *inp; u_int16_t fport = fport_arg, lport = lport_arg; rdomain = rtable_l2(rdomain); /* convert passed rtableid to rdomain */ head = INPCBHASH(table, &faddr, fport, &laddr, lport, rdomain); LIST_FOREACH(inp, head, inp_hash) { #ifdef INET6 if (inp->inp_flags & INP_IPV6) continue; /*XXX*/ #endif if (inp->inp_faddr.s_addr == faddr.s_addr && inp->inp_fport == fport && inp->inp_lport == lport && inp->inp_laddr.s_addr == laddr.s_addr && rtable_l2(inp->inp_rtableid) == rdomain) { /* * Move this PCB to the head of hash chain so that * repeated accesses are quicker. This is analogous to * the historic single-entry PCB cache. */ if (inp != LIST_FIRST(head)) { LIST_REMOVE(inp, inp_hash); LIST_INSERT_HEAD(head, inp, inp_hash); } break; } } #ifdef DIAGNOSTIC if (inp == NULL && in_pcbnotifymiss) { printf("in_pcbhashlookup: faddr=%08x fport=%d laddr=%08x lport=%d rdom=%d\n", ntohl(faddr.s_addr), ntohs(fport), ntohl(laddr.s_addr), ntohs(lport), rdomain); } #endif return (inp); } #ifdef INET6 struct inpcb * in6_pcbhashlookup(struct inpcbtable *table, const struct in6_addr *faddr, u_int fport_arg, const struct in6_addr *laddr, u_int lport_arg, u_int rtable) { struct inpcbhead *head; struct inpcb *inp; u_int16_t fport = fport_arg, lport = lport_arg; rtable = rtable_l2(rtable); /* convert passed rtableid to rdomain */ head = IN6PCBHASH(table, faddr, fport, laddr, lport, rtable); LIST_FOREACH(inp, head, inp_hash) { if (!(inp->inp_flags & INP_IPV6)) continue; if (IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, faddr) && inp->inp_fport == fport && inp->inp_lport == lport && IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, laddr) && rtable_l2(inp->inp_rtableid) == rtable) { /* * Move this PCB to the head of hash chain so that * repeated accesses are quicker. This is analogous to * the historic single-entry PCB cache. */ if (inp != LIST_FIRST(head)) { LIST_REMOVE(inp, inp_hash); LIST_INSERT_HEAD(head, inp, inp_hash); } break; } } #ifdef DIAGNOSTIC if (inp == NULL && in_pcbnotifymiss) { printf("in6_pcbhashlookup: faddr="); printf(" fport=%d laddr=", ntohs(fport)); printf(" lport=%d\n", ntohs(lport)); } #endif return (inp); } #endif /* INET6 */ /* * The in(6)_pcblookup_listen functions are used to locate listening * sockets quickly. This are sockets with unspecified foreign address * and port: * *.* <-> laddr.lport * *.* <-> *.lport */ struct inpcb * in_pcblookup_listen(struct inpcbtable *table, struct in_addr laddr, u_int lport_arg, int reverse, struct mbuf *m, u_int rdomain) { struct inpcbhead *head; struct in_addr *key1, *key2; struct inpcb *inp; u_int16_t lport = lport_arg; rdomain = rtable_l2(rdomain); /* convert passed rtableid to rdomain */ #if NPF > 0 if (m && m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) { struct pf_divert *divert; if ((divert = pf_find_divert(m)) == NULL) return (NULL); key1 = key2 = &divert->addr.v4; lport = divert->port; } else #endif if (reverse) { key1 = &zeroin_addr; key2 = &laddr; } else { key1 = &laddr; key2 = &zeroin_addr; } head = INPCBHASH(table, &zeroin_addr, 0, key1, lport, rdomain); LIST_FOREACH(inp, head, inp_hash) { #ifdef INET6 if (inp->inp_flags & INP_IPV6) continue; /*XXX*/ #endif if (inp->inp_lport == lport && inp->inp_fport == 0 && inp->inp_laddr.s_addr == key1->s_addr && inp->inp_faddr.s_addr == INADDR_ANY && rtable_l2(inp->inp_rtableid) == rdomain) break; } if (inp == NULL && key1->s_addr != key2->s_addr) { head = INPCBHASH(table, &zeroin_addr, 0, key2, lport, rdomain); LIST_FOREACH(inp, head, inp_hash) { #ifdef INET6 if (inp->inp_flags & INP_IPV6) continue; /*XXX*/ #endif if (inp->inp_lport == lport && inp->inp_fport == 0 && inp->inp_laddr.s_addr == key2->s_addr && inp->inp_faddr.s_addr == INADDR_ANY && rtable_l2(inp->inp_rtableid) == rdomain) break; } } #ifdef DIAGNOSTIC if (inp == NULL && in_pcbnotifymiss) { printf("in_pcblookup_listen: laddr=%08x lport=%d\n", ntohl(laddr.s_addr), ntohs(lport)); } #endif /* * Move this PCB to the head of hash chain so that * repeated accesses are quicker. This is analogous to * the historic single-entry PCB cache. */ if (inp != NULL && inp != LIST_FIRST(head)) { LIST_REMOVE(inp, inp_hash); LIST_INSERT_HEAD(head, inp, inp_hash); } return (inp); } #ifdef INET6 struct inpcb * in6_pcblookup_listen(struct inpcbtable *table, struct in6_addr *laddr, u_int lport_arg, int reverse, struct mbuf *m, u_int rtable) { struct inpcbhead *head; struct in6_addr *key1, *key2; struct inpcb *inp; u_int16_t lport = lport_arg; rtable = rtable_l2(rtable); /* convert passed rtableid to rdomain */ #if NPF > 0 if (m && m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) { struct pf_divert *divert; if ((divert = pf_find_divert(m)) == NULL) return (NULL); key1 = key2 = &divert->addr.v6; lport = divert->port; } else #endif if (reverse) { key1 = &zeroin6_addr; key2 = laddr; } else { key1 = laddr; key2 = &zeroin6_addr; } head = IN6PCBHASH(table, &zeroin6_addr, 0, key1, lport, rtable); LIST_FOREACH(inp, head, inp_hash) { if (!(inp->inp_flags & INP_IPV6)) continue; if (inp->inp_lport == lport && inp->inp_fport == 0 && IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, key1) && IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6) && rtable_l2(inp->inp_rtableid) == rtable) break; } if (inp == NULL && ! IN6_ARE_ADDR_EQUAL(key1, key2)) { head = IN6PCBHASH(table, &zeroin6_addr, 0, key2, lport, rtable); LIST_FOREACH(inp, head, inp_hash) { if (!(inp->inp_flags & INP_IPV6)) continue; if (inp->inp_lport == lport && inp->inp_fport == 0 && IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, key2) && IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6) && rtable_l2(inp->inp_rtableid) == rtable) break; } } #ifdef DIAGNOSTIC if (inp == NULL && in_pcbnotifymiss) { printf("in6_pcblookup_listen: laddr= lport=%d\n", ntohs(lport)); } #endif /* * Move this PCB to the head of hash chain so that * repeated accesses are quicker. This is analogous to * the historic single-entry PCB cache. */ if (inp != NULL && inp != LIST_FIRST(head)) { LIST_REMOVE(inp, inp_hash); LIST_INSERT_HEAD(head, inp, inp_hash); } return (inp); } #endif /* INET6 */