/* $OpenBSD: in_pcb.c,v 1.111 2010/01/15 18:20:23 chl 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 #include #ifdef INET6 #include #endif /* INET6 */ #ifdef IPSEC #include #endif /* IPSEC */ struct in_addr zeroin_addr; extern int ipsec_auth_default_level; extern int ipsec_esp_trans_default_level; extern int ipsec_esp_network_default_level; extern int ipsec_ipcomp_default_level; /* * 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 pool inpcb_pool; int inpcb_pool_initialized = 0; #define INPCBHASH(table, faddr, fport, laddr, lport, rdom) \ &(table)->inpt_hashtbl[(ntohl((faddr)->s_addr) + \ ntohs((fport)) + ntohs((lport)) + (rdom)) & (table->inpt_hash)] #define IN6PCBHASH(table, faddr, fport, laddr, lport) \ &(table)->inpt_hashtbl[(ntohl((faddr)->s6_addr32[0] ^ \ (faddr)->s6_addr32[3]) + ntohs((fport)) + ntohs((lport))) & \ (table->inpt_hash)] #define INPCBLHASH(table, lport, rdom) \ &(table)->inpt_lhashtbl[(ntohs((lport)) + (rdom)) & table->inpt_lhash] void in_pcbinit(table, hashsize) struct inpcbtable *table; int hashsize; { CIRCLEQ_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; } struct baddynamicports baddynamicports; /* * 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(so, v) struct socket *so; void *v; { struct inpcbtable *table = v; struct inpcb *inp; int s; 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_default_level; inp->inp_seclevel[SL_ESP_TRANS] = ipsec_esp_trans_default_level; inp->inp_seclevel[SL_ESP_NETWORK] = ipsec_esp_network_default_level; inp->inp_seclevel[SL_IPCOMP] = ipsec_ipcomp_default_level; inp->inp_rdomain = curproc->p_p->ps_rdomain; s = splnet(); CIRCLEQ_INSERT_HEAD(&table->inpt_queue, inp, inp_queue); LIST_INSERT_HEAD(INPCBLHASH(table, inp->inp_lport, inp->inp_rdomain), inp, inp_lhash); LIST_INSERT_HEAD(INPCBHASH(table, &inp->inp_faddr, inp->inp_fport, &inp->inp_laddr, inp->inp_lport, inp->inp_rdomain), 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->in6p_cksum = -1; #endif /* INET6 */ return (0); } int in_pcbbind(v, nam, p) void *v; struct mbuf *nam; struct proc *p; { struct inpcb *inp = v; 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 (TAILQ_EMPTY(&in_ifaddr)) return (EADDRNOTAVAIL); 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... */ if (!(so->so_options & SO_BINDANY) && in_iawithaddr(sin->sin_addr, NULL, inp->inp_rdomain) == 0) 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_rdomain); 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_rdomain); 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_rdomain)); } 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_rdomain)); } } 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(v, nam) void *v; struct mbuf *nam; { struct inpcb *inp = v; struct sockaddr_in *ifaddr = NULL; struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); #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 (!TAILQ_EMPTY(&in_ifaddr)) { /* * If the destination address is INADDR_ANY, * use the primary local address. * If the supplied address is INADDR_BROADCAST, * and the primary interface supports broadcast, * choose the broadcast address for that interface. */ if (sin->sin_addr.s_addr == INADDR_ANY) sin->sin_addr = TAILQ_FIRST(&in_ifaddr)->ia_addr.sin_addr; else if (sin->sin_addr.s_addr == INADDR_BROADCAST && (TAILQ_FIRST(&in_ifaddr)->ia_ifp->if_flags & IFF_BROADCAST)) sin->sin_addr = TAILQ_FIRST(&in_ifaddr)->ia_broadaddr.sin_addr; } if (inp->inp_laddr.s_addr == INADDR_ANY) { int error; ifaddr = in_selectsrc(sin, &inp->inp_route, inp->inp_socket->so_options, inp->inp_moptions, &error, inp->inp_rdomain); if (ifaddr == NULL) { if (error == 0) error = EADDRNOTAVAIL; return error; } } if (in_pcbhashlookup(inp->inp_table, sin->sin_addr, sin->sin_port, inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr, inp->inp_lport, inp->inp_rdomain) != 0) return (EADDRINUSE); if (inp->inp_laddr.s_addr == INADDR_ANY) { if (inp->inp_lport == 0 && in_pcbbind(inp, NULL, curproc) == EADDRNOTAVAIL) return (EADDRNOTAVAIL); inp->inp_laddr = ifaddr->sin_addr; } inp->inp_faddr = sin->sin_addr; inp->inp_fport = sin->sin_port; in_pcbrehash(inp); #ifdef IPSEC { int error; /* This is just ignored */ /* Cause an IPsec SA to be established. */ ipsp_spd_inp(NULL, AF_INET, 0, &error, IPSP_DIRECTION_OUT, NULL, inp, NULL); } #endif return (0); } void in_pcbdisconnect(v) void *v; { struct inpcb *inp = v; 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(v) void *v; { struct inpcb *inp = v; struct socket *so = inp->inp_socket; int s; so->so_pcb = 0; sofree(so); if (inp->inp_options) 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); #ifdef IPSEC /* IPsec cleanup here */ s = spltdb(); if (inp->inp_tdb_in) TAILQ_REMOVE(&inp->inp_tdb_in->tdb_inp_in, inp, inp_tdb_in_next); if (inp->inp_tdb_out) TAILQ_REMOVE(&inp->inp_tdb_out->tdb_inp_out, inp, inp_tdb_out_next); if (inp->inp_ipsec_remotecred) ipsp_reffree(inp->inp_ipsec_remotecred); if (inp->inp_ipsec_remoteauth) ipsp_reffree(inp->inp_ipsec_remoteauth); if (inp->inp_ipo) ipsec_delete_policy(inp->inp_ipo); splx(s); #endif #if NPF > 0 if (inp->inp_pf_sk) ((struct pf_state_key *)inp->inp_pf_sk)->inp = NULL; #endif s = splnet(); LIST_REMOVE(inp, inp_lhash); LIST_REMOVE(inp, inp_hash); CIRCLEQ_REMOVE(&inp->inp_table->inpt_queue, inp, inp_queue); splx(s); pool_put(&inpcb_pool, inp); } void in_setsockaddr(inp, nam) struct inpcb *inp; struct mbuf *nam; { struct sockaddr_in *sin; nam->m_len = sizeof (*sin); sin = mtod(nam, struct sockaddr_in *); bzero((caddr_t)sin, 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(inp, nam) 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 *); bzero((caddr_t)sin, 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(table, dst, rdomain, errno, notify) struct inpcbtable *table; struct sockaddr *dst; u_int rdomain; int errno; void (*notify)(struct inpcb *, int); { struct inpcb *inp, *oinp; 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; for (inp = CIRCLEQ_FIRST(&table->inpt_queue); inp != CIRCLEQ_END(&table->inpt_queue);) { #ifdef INET6 if (inp->inp_flags & INP_IPV6) { inp = CIRCLEQ_NEXT(inp, inp_queue); continue; } #endif if (inp->inp_faddr.s_addr != faddr.s_addr || inp->inp_rdomain != rdomain || inp->inp_socket == 0) { inp = CIRCLEQ_NEXT(inp, inp_queue); continue; } oinp = inp; inp = CIRCLEQ_NEXT(inp, inp_queue); if (notify) (*notify)(oinp, 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(inp) struct inpcb *inp; { struct rtentry *rt; struct rt_addrinfo info; if ((rt = inp->inp_route.ro_rt)) { inp->inp_route.ro_rt = 0; bzero((caddr_t)&info, 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_rdomain); if (rt->rt_flags & RTF_DYNAMIC) (void)rtrequest1(RTM_DELETE, &info, rt->rt_priority, (struct rtentry **)0, inp->inp_rdomain); /* * 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(inp, errno) 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 = 0; 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; rdomain = rtable_l2(rdomain); for (inp = LIST_FIRST(INPCBLHASH(table, lport, rdomain)); inp; inp = LIST_NEXT(inp, inp_lhash)) { if (inp->inp_rdomain != 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(inp) struct inpcb *inp; { struct route *ro; ro = &inp->inp_route; /* * No route yet, so try to acquire one. */ if (ro->ro_rt == NULL) { #ifdef INET6 bzero(ro, sizeof(struct route_in6)); #else bzero(ro, 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); ((struct sockaddr_in6 *) &ro->ro_dst)->sin6_addr = inp->inp_faddr6; rtalloc_mpath(ro, &inp->inp_laddr6.s6_addr32[0], 0); 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(ro->ro_dst); satosin(&ro->ro_dst)->sin_addr = inp->inp_faddr; rtalloc_mpath(ro, &inp->inp_laddr.s_addr, inp->inp_rdomain); break; } } return (ro->ro_rt); } struct sockaddr_in * in_selectsrc(struct sockaddr_in *sin, struct route *ro, int soopts, struct ip_moptions *mopts, int *errorp, u_int rdomain) { struct sockaddr_in *sin2; struct in_ifaddr *ia; ia = (struct in_ifaddr *)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 && (satosin(&ro->ro_dst)->sin_addr.s_addr != sin->sin_addr.s_addr || soopts & SO_DONTROUTE)) { RTFREE(ro->ro_rt); ro->ro_rt = (struct rtentry *)0; } if ((soopts & SO_DONTROUTE) == 0 && /*XXX*/ (ro->ro_rt == (struct rtentry *)0 || ro->ro_rt->rt_ifp == (struct ifnet *)0)) { /* 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; rtalloc_mpath(ro, NULL, rdomain); /* * It is important to bzero out the rest of the * struct sockaddr_in when mixing v6 & v4! */ sin2 = (struct sockaddr_in *)&ro->ro_dst; bzero(sin2->sin_zero, sizeof(sin2->sin_zero)); } /* * If we found a route, use the address * corresponding to the outgoing interface * unless it is the loopback (in case a route * to our address on another net goes to loopback). */ if (ro->ro_rt && !(ro->ro_rt->rt_ifp->if_flags & IFF_LOOPBACK)) ia = ifatoia(ro->ro_rt->rt_ifa); if (ia == 0) { u_int16_t fport = sin->sin_port; sin->sin_port = 0; ia = ifatoia(ifa_ifwithdstaddr(sintosa(sin), rdomain)); if (ia == 0) ia = ifatoia(ifa_ifwithnet(sintosa(sin), rdomain)); sin->sin_port = fport; if (ia == 0) ia = TAILQ_FIRST(&in_ifaddr); if (ia == 0) { *errorp = EADDRNOTAVAIL; return NULL; } } /* * 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 ip_moptions *imo; struct ifnet *ifp; imo = mopts; if (imo->imo_multicast_ifp != NULL) { ifp = imo->imo_multicast_ifp; TAILQ_FOREACH(ia, &in_ifaddr, ia_list) if (ia->ia_ifp == ifp) break; if (ia == 0) { *errorp = EADDRNOTAVAIL; return NULL; } } } return satosin(&ia->ia_addr); } void in_pcbrehash(inp) struct inpcb *inp; { struct inpcbtable *table = inp->inp_table; int s; s = splnet(); LIST_REMOVE(inp, inp_lhash); LIST_INSERT_HEAD(INPCBLHASH(table, inp->inp_lport, inp->inp_rdomain), inp, inp_lhash); LIST_REMOVE(inp, inp_hash); #ifdef INET6 if (inp->inp_flags & INP_IPV6) { LIST_INSERT_HEAD(IN6PCBHASH(table, &inp->inp_faddr6, inp->inp_fport, &inp->inp_laddr6, inp->inp_lport), inp, inp_hash); } else { #endif /* INET6 */ LIST_INSERT_HEAD(INPCBHASH(table, &inp->inp_faddr, inp->inp_fport, &inp->inp_laddr, inp->inp_lport, inp->inp_rdomain), inp, inp_hash); #ifdef INET6 } #endif /* INET6 */ splx(s); } #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); 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 && inp->inp_rdomain == 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, struct in6_addr *faddr, u_int fport_arg, struct in6_addr *laddr, u_int lport_arg) { struct inpcbhead *head; struct inpcb *inp; u_int16_t fport = fport_arg, lport = lport_arg; head = IN6PCBHASH(table, faddr, fport, laddr, lport); 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)) { /* * 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); #if NPF > 0 if (m && m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) { struct pf_divert *divert; /* XXX rdomain */ if ((divert = pf_find_divert(m)) == NULL) return (NULL); key1 = key2 = &divert->addr.ipv4; 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 && inp->inp_rdomain == 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 && inp->inp_rdomain == 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) { struct inpcbhead *head; struct in6_addr *key1, *key2; struct inpcb *inp; u_int16_t lport = lport_arg; #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.ipv6; 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); 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)) break; } if (inp == NULL && ! IN6_ARE_ADDR_EQUAL(key1, key2)) { head = IN6PCBHASH(table, &zeroin6_addr, 0, key2, lport); 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)) 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 */