/* * Copyright (c) 2003-2021 Apple Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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 #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 #include #include #include #include #if IPSEC #include #include #include #include #include #endif /* IPSEC */ #if NECP #include #endif /* NECP */ #include /* * in6_pcblookup_local_and_cleanup does everything * in6_pcblookup_local does but it checks for a socket * that's going away. Since we know that the lock is * held read+write when this function is called, we * can safely dispose of this socket like the slow * timer would usually do and return NULL. This is * great for bind. */ static struct inpcb * in6_pcblookup_local_and_cleanup(struct inpcbinfo *pcbinfo, struct in6_addr *laddr, u_int lport_arg, uint32_t ifscope, int wild_okay) { struct inpcb *inp; /* Perform normal lookup */ inp = in6_pcblookup_local(pcbinfo, laddr, lport_arg, ifscope, wild_okay); /* Check if we found a match but it's waiting to be disposed */ if (inp != NULL && inp->inp_wantcnt == WNT_STOPUSING) { struct socket *so = inp->inp_socket; socket_lock(so, 0); if (so->so_usecount == 0) { if (inp->inp_state != INPCB_STATE_DEAD) { in6_pcbdetach(inp); } in_pcbdispose(inp); /* will unlock & destroy */ inp = NULL; } else { socket_unlock(so, 0); } } return inp; } /* * Bind an INPCB to an address and/or port. This routine should not alter * the caller-supplied local address "nam". */ int in6_pcbbind(struct inpcb *inp, struct sockaddr *nam, struct proc *p) { struct socket *so = inp->inp_socket; struct inpcbinfo *pcbinfo = inp->inp_pcbinfo; u_short lport = 0; int wild = 0, reuseport = (so->so_options & SO_REUSEPORT); struct ifnet *outif = NULL; struct sockaddr_in6 sin6; uint32_t lifscope = IFSCOPE_NONE; int error = 0; #if XNU_TARGET_OS_OSX kauth_cred_t cred; #endif /* XNU_TARGET_OS_OSX */ if (inp->inp_flags2 & INP2_BIND_IN_PROGRESS) { return EINVAL; } inp->inp_flags2 |= INP2_BIND_IN_PROGRESS; if (TAILQ_EMPTY(&in6_ifaddrhead)) { /* XXX broken! */ error = EADDRNOTAVAIL; goto done; } if (!(so->so_options & (SO_REUSEADDR | SO_REUSEPORT))) { wild = 1; } in_pcb_check_management_entitled(inp); socket_unlock(so, 0); /* keep reference */ lck_rw_lock_exclusive(&pcbinfo->ipi_lock); if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { /* another thread completed the bind */ lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EINVAL; goto done; } SOCKADDR_ZERO(&sin6, sizeof(sin6)); if (nam != NULL) { if (nam->sa_len != sizeof(struct sockaddr_in6)) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EINVAL; goto done; } /* * family check. */ if (nam->sa_family != AF_INET6) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EAFNOSUPPORT; goto done; } lport = SIN6(nam)->sin6_port; *(&sin6) = *SIN6(nam); /* KAME hack: embed scopeid */ if (in6_embedscope(&sin6.sin6_addr, &sin6, inp, NULL, NULL, &lifscope) != 0) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EINVAL; goto done; } /* Sanitize local copy for address searches */ sin6.sin6_flowinfo = 0; sin6.sin6_port = 0; if (in6_embedded_scope) { sin6.sin6_scope_id = 0; } 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) { reuseport = SO_REUSEADDR | SO_REUSEPORT; } } else if (!IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr)) { struct ifaddr *ifa; ifa = ifa_ifwithaddr(SA(&sin6)); if (ifa == NULL) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EADDRNOTAVAIL; goto done; } else { /* * XXX: bind to an anycast address might * accidentally cause sending a packet with * anycast source address. We should allow * to bind to a deprecated address, since * the application dare to use it. */ IFA_LOCK_SPIN(ifa); if (((struct in6_ifaddr *)ifa)->ia6_flags & (IN6_IFF_ANYCAST | IN6_IFF_NOTREADY | IN6_IFF_DETACHED | IN6_IFF_CLAT46)) { IFA_UNLOCK(ifa); ifa_remref(ifa); lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EADDRNOTAVAIL; goto done; } /* * Opportunistically determine the outbound * interface that may be used; this may not * hold true if we end up using a route * going over a different interface, e.g. * when sending to a local address. This * will get updated again after sending. */ outif = ifa->ifa_ifp; IFA_UNLOCK(ifa); ifa_remref(ifa); } } #if SKYWALK if (inp->inp_flags2 & INP2_EXTERNAL_PORT) { // Extract the external flow info struct ns_flow_info nfi = {}; int netns_error = necp_client_get_netns_flow_info(inp->necp_client_uuid, &nfi); if (netns_error != 0) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = netns_error; goto done; } // Extract the reserved port u_int16_t reserved_lport = 0; if (nfi.nfi_laddr.sa.sa_family == AF_INET) { reserved_lport = nfi.nfi_laddr.sin.sin_port; } else if (nfi.nfi_laddr.sa.sa_family == AF_INET6) { reserved_lport = nfi.nfi_laddr.sin6.sin6_port; } else { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EINVAL; goto done; } // Validate or use the reserved port if (lport == 0) { lport = reserved_lport; } else if (lport != reserved_lport) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EINVAL; goto done; } } /* Do not allow reserving a UDP port if remaining UDP port count is below 4096 */ if (SOCK_PROTO(so) == IPPROTO_UDP && !allow_udp_port_exhaustion) { uint32_t current_reservations = 0; current_reservations = netns_lookup_reservations_count_in6(inp->in6p_laddr, IPPROTO_UDP); if (USHRT_MAX - UDP_RANDOM_PORT_RESERVE < current_reservations) { log(LOG_ERR, "UDP port not available, less than 4096 UDP ports left"); lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EADDRNOTAVAIL; goto done; } } #endif /* SKYWALK */ if (lport != 0) { struct inpcb *t; uid_t u; #if XNU_TARGET_OS_OSX if (ntohs(lport) < IPV6PORT_RESERVED && !IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) && !(inp->inp_flags2 & INP2_EXTERNAL_PORT)) { cred = kauth_cred_proc_ref(p); error = priv_check_cred(cred, PRIV_NETINET_RESERVEDPORT, 0); kauth_cred_unref(&cred); if (error != 0) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EACCES; goto done; } } #endif /* XNU_TARGET_OS_OSX */ /* * Check wether the process is allowed to bind to a restricted port */ if (!current_task_can_use_restricted_in_port(lport, (uint8_t)SOCK_PROTO(so), PORT_FLAGS_BSD)) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EADDRINUSE; goto done; } if (!IN6_IS_ADDR_MULTICAST(&sin6.sin6_addr) && (u = kauth_cred_getuid(so->so_cred)) != 0) { t = in6_pcblookup_local_and_cleanup(pcbinfo, &sin6.sin6_addr, lport, sin6.sin6_scope_id, INPLOOKUP_WILDCARD); if (t != NULL && (!IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr) || !IN6_IS_ADDR_UNSPECIFIED(&t->in6p_laddr) || !(t->inp_socket->so_options & SO_REUSEPORT)) && (u != kauth_cred_getuid(t->inp_socket->so_cred)) && !(t->inp_socket->so_flags & SOF_REUSESHAREUID) && (!(t->inp_flags2 & INP2_EXTERNAL_PORT) || !(inp->inp_flags2 & INP2_EXTERNAL_PORT) || uuid_compare(t->necp_client_uuid, inp->necp_client_uuid) != 0)) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EADDRINUSE; goto done; } if (!(inp->inp_flags & IN6P_IPV6_V6ONLY) && IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr)) { struct sockaddr_in sin; in6_sin6_2_sin(&sin, &sin6); t = in_pcblookup_local_and_cleanup( pcbinfo, sin.sin_addr, lport, INPLOOKUP_WILDCARD); if (t != NULL && !(t->inp_socket->so_options & SO_REUSEPORT) && (kauth_cred_getuid(so->so_cred) != kauth_cred_getuid(t->inp_socket->so_cred)) && (t->inp_laddr.s_addr != INADDR_ANY || SOCK_DOM(so) == SOCK_DOM(t->inp_socket)) && (!(t->inp_flags2 & INP2_EXTERNAL_PORT) || !(inp->inp_flags2 & INP2_EXTERNAL_PORT) || uuid_compare(t->necp_client_uuid, inp->necp_client_uuid) != 0)) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EADDRINUSE; goto done; } #if SKYWALK VERIFY(!NETNS_TOKEN_VALID( &inp->inp_wildcard_netns_token)); if ((SOCK_PROTO(so) == IPPROTO_TCP || SOCK_PROTO(so) == IPPROTO_UDP) && !(inp->inp_flags2 & INP2_EXTERNAL_PORT)) { if (netns_reserve_in(&inp-> inp_wildcard_netns_token, sin.sin_addr, (uint8_t)SOCK_PROTO(so), lport, NETNS_BSD, NULL) != 0) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EADDRINUSE; goto done; } } #endif /* SKYWALK */ } } t = in6_pcblookup_local_and_cleanup(pcbinfo, &sin6.sin6_addr, lport, sin6.sin6_scope_id, wild); if (t != NULL && (reuseport & t->inp_socket->so_options) == 0 && (!(t->inp_flags2 & INP2_EXTERNAL_PORT) || !(inp->inp_flags2 & INP2_EXTERNAL_PORT) || uuid_compare(t->necp_client_uuid, inp->necp_client_uuid) != 0)) { #if SKYWALK netns_release(&inp->inp_wildcard_netns_token); #endif /* SKYWALK */ lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EADDRINUSE; goto done; } if (!(inp->inp_flags & IN6P_IPV6_V6ONLY) && IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr)) { struct sockaddr_in sin; in6_sin6_2_sin(&sin, &sin6); t = in_pcblookup_local_and_cleanup(pcbinfo, sin.sin_addr, lport, wild); if (t != NULL && (reuseport & t->inp_socket->so_options) == 0 && (t->inp_laddr.s_addr != INADDR_ANY || SOCK_DOM(so) == SOCK_DOM(t->inp_socket)) && (!(t->inp_flags2 & INP2_EXTERNAL_PORT) || !(inp->inp_flags2 & INP2_EXTERNAL_PORT) || uuid_compare(t->necp_client_uuid, inp->necp_client_uuid) != 0)) { #if SKYWALK netns_release(&inp->inp_wildcard_netns_token); #endif /* SKYWALK */ lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EADDRINUSE; goto done; } #if SKYWALK if ((SOCK_PROTO(so) == IPPROTO_TCP || SOCK_PROTO(so) == IPPROTO_UDP) && !(inp->inp_flags2 & INP2_EXTERNAL_PORT) && (!NETNS_TOKEN_VALID( &inp->inp_wildcard_netns_token))) { if (netns_reserve_in(&inp-> inp_wildcard_netns_token, sin.sin_addr, (uint8_t)SOCK_PROTO(so), lport, NETNS_BSD, NULL) != 0) { lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EADDRINUSE; goto done; } } #endif /* SKYWALK */ } #if SKYWALK if ((SOCK_PROTO(so) == IPPROTO_TCP || SOCK_PROTO(so) == IPPROTO_UDP) && !(inp->inp_flags2 & INP2_EXTERNAL_PORT)) { if (netns_reserve_in6(&inp->inp_netns_token, sin6.sin6_addr, (uint8_t)SOCK_PROTO(so), lport, NETNS_BSD, NULL) != 0) { netns_release(&inp->inp_wildcard_netns_token); lck_rw_done(&pcbinfo->ipi_lock); socket_lock(so, 0); error = EADDRINUSE; goto done; } } #endif /* SKYWALK */ } } socket_lock(so, 0); /* * We unlocked socket's protocol lock for a long time. * The socket might have been dropped/defuncted. * Checking if world has changed since. */ if (inp->inp_state == INPCB_STATE_DEAD) { #if SKYWALK netns_release(&inp->inp_netns_token); netns_release(&inp->inp_wildcard_netns_token); #endif /* SKYWALK */ lck_rw_done(&pcbinfo->ipi_lock); error = ECONNABORTED; goto done; } /* check if the socket got bound when the lock was released */ if (inp->inp_lport || !IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { #if SKYWALK netns_release(&inp->inp_netns_token); netns_release(&inp->inp_wildcard_netns_token); #endif /* SKYWALK */ lck_rw_done(&pcbinfo->ipi_lock); error = EINVAL; goto done; } if (!IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr)) { inp->in6p_laddr = sin6.sin6_addr; inp->in6p_last_outifp = outif; inp->inp_lifscope = lifscope; in6_verify_ifscope(&inp->in6p_laddr, lifscope); #if SKYWALK if (NETNS_TOKEN_VALID(&inp->inp_netns_token)) { netns_set_ifnet(&inp->inp_netns_token, inp->in6p_last_outifp); } #endif /* SKYWALK */ } if (lport == 0) { int e; if ((e = in6_pcbsetport(&inp->in6p_laddr, inp, p, 1)) != 0) { /* Undo any address bind from above. */ #if SKYWALK netns_release(&inp->inp_netns_token); netns_release(&inp->inp_wildcard_netns_token); #endif /* SKYWALK */ inp->in6p_laddr = in6addr_any; inp->in6p_last_outifp = NULL; inp->inp_lifscope = IFSCOPE_NONE; lck_rw_done(&pcbinfo->ipi_lock); error = e; goto done; } } else { inp->inp_lport = lport; if (in_pcbinshash(inp, 1) != 0) { #if SKYWALK netns_release(&inp->inp_netns_token); netns_release(&inp->inp_wildcard_netns_token); #endif /* SKYWALK */ inp->in6p_laddr = in6addr_any; inp->inp_lifscope = IFSCOPE_NONE; inp->inp_lport = 0; inp->in6p_last_outifp = NULL; lck_rw_done(&pcbinfo->ipi_lock); error = EAGAIN; goto done; } } lck_rw_done(&pcbinfo->ipi_lock); sflt_notify(so, sock_evt_bound, NULL); done: inp->inp_flags2 &= ~INP2_BIND_IN_PROGRESS; return error; } /* * Transform old in6_pcbconnect() into an inner subroutine for new * in6_pcbconnect(); do some validity-checking on the remote address * (in "nam") and then determine local host address (i.e., which * interface) to use to access that remote host. * * This routine may alter the caller-supplied remote address "nam". * * This routine might return an ifp with a reference held if the caller * provides a non-NULL outif, even in the error case. The caller is * responsible for releasing its reference. */ int in6_pcbladdr(struct inpcb *inp, struct sockaddr *nam, struct in6_addr *plocal_addr6, struct ifnet **outif) { struct in6_addr *addr6 = NULL; struct in6_addr src_storage; int error = 0; unsigned int ifscope; if (outif != NULL) { *outif = NULL; } if (nam->sa_len != sizeof(struct sockaddr_in6)) { return EINVAL; } if (SIN6(nam)->sin6_family != AF_INET6) { return EAFNOSUPPORT; } if (SIN6(nam)->sin6_port == 0) { return EADDRNOTAVAIL; } /* KAME hack: embed scopeid */ if (in6_embedscope(&SIN6(nam)->sin6_addr, SIN6(nam), inp, NULL, NULL, IN6_NULL_IF_EMBEDDED_SCOPE(&SIN6(nam)->sin6_scope_id)) != 0) { return EINVAL; } in_pcb_check_management_entitled(inp); if (!TAILQ_EMPTY(&in6_ifaddrhead)) { /* * If the destination address is UNSPECIFIED addr, * use the loopback addr, e.g ::1. */ if (IN6_IS_ADDR_UNSPECIFIED(&SIN6(nam)->sin6_addr)) { SIN6(nam)->sin6_addr = in6addr_loopback; } } ifscope = (inp->inp_flags & INP_BOUND_IF) ? inp->inp_boundifp->if_index : IFSCOPE_NONE; /* * XXX: in6_selectsrc might replace the bound local address * with the address specified by setsockopt(IPV6_PKTINFO). * Is it the intended behavior? * * in6_selectsrc() might return outif with its reference held * even in the error case; caller always needs to release it * if non-NULL. */ addr6 = in6_selectsrc(SIN6(nam), inp->in6p_outputopts, inp, &inp->in6p_route, outif, &src_storage, ifscope, &error); if (outif != NULL) { struct rtentry *rt = inp->in6p_route.ro_rt; /* * If in6_selectsrc() returns a route, it should be one * which points to the same ifp as outif. Just in case * it isn't, use the one from the route for consistency. * Otherwise if there is no route, leave outif alone as * it could still be useful to the caller. */ if (rt != NULL && rt->rt_ifp != *outif) { ifnet_reference(rt->rt_ifp); /* for caller */ if (*outif != NULL) { ifnet_release(*outif); } *outif = rt->rt_ifp; } } if (addr6 == NULL) { if (outif != NULL && (*outif) != NULL && inp_restricted_send(inp, *outif)) { soevent(inp->inp_socket, (SO_FILT_HINT_LOCKED | SO_FILT_HINT_IFDENIED)); error = EHOSTUNREACH; } if (error == 0) { error = EADDRNOTAVAIL; } return error; } *plocal_addr6 = *addr6; /* * Don't do pcblookup call here; return interface in * plocal_addr6 and exit to caller, that will do the lookup. */ return 0; } /* * Outer subroutine: * 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 in6_pcbconnect(struct inpcb *inp, struct sockaddr *nam, struct proc *p) { struct in6_addr addr6; struct sockaddr_in6 *sin6 = SIN6(nam); struct inpcb *pcb; int error = 0; struct ifnet *outif = NULL; struct socket *so = inp->inp_socket; #if CONTENT_FILTER so->so_state_change_cnt++; #endif if (SOCK_CHECK_PROTO(so, IPPROTO_UDP) && sin6->sin6_port == htons(53) && !(so->so_flags1 & SOF1_DNS_COUNTED)) { so->so_flags1 |= SOF1_DNS_COUNTED; INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet_dgram_dns); } /* * Call inner routine, to assign local interface address. * in6_pcbladdr() may automatically fill in sin6_scope_id. * * in6_pcbladdr() might return an ifp with its reference held * even in the error case, so make sure that it's released * whenever it's non-NULL. */ if ((error = in6_pcbladdr(inp, nam, &addr6, &outif)) != 0) { if (outif != NULL && inp_restricted_send(inp, outif)) { soevent(so, (SO_FILT_HINT_LOCKED | SO_FILT_HINT_IFDENIED)); } goto done; } socket_unlock(so, 0); uint32_t lifscope; if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { lifscope = inp->inp_lifscope; } else if (outif != NULL) { lifscope = in6_addr2scopeid(outif, &addr6); } else { lifscope = sin6->sin6_scope_id; } pcb = in6_pcblookup_hash(inp->inp_pcbinfo, &sin6->sin6_addr, sin6->sin6_port, sin6->sin6_scope_id, IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr) ? &addr6 : &inp->in6p_laddr, inp->inp_lport, lifscope, 0, NULL); socket_lock(so, 0); if (pcb != NULL) { in_pcb_checkstate(pcb, WNT_RELEASE, pcb == inp ? 1 : 0); error = EADDRINUSE; goto done; } if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { if (inp->inp_lport == 0) { error = in6_pcbbind(inp, NULL, p); if (error) { goto done; } } inp->in6p_laddr = addr6; inp->in6p_last_outifp = outif; /* no reference needed */ if (IN6_IS_SCOPE_EMBED(&inp->in6p_laddr) && IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, &sin6->sin6_addr)) { inp->inp_lifscope = sin6->sin6_scope_id; } else { inp->inp_lifscope = lifscope; } in6_verify_ifscope(&inp->in6p_laddr, inp->inp_lifscope); #if SKYWALK if (NETNS_TOKEN_VALID(&inp->inp_netns_token)) { netns_set_ifnet(&inp->inp_netns_token, inp->in6p_last_outifp); } #endif /* SKYWALK */ inp->in6p_flags |= INP_IN6ADDR_ANY; } if (!lck_rw_try_lock_exclusive(&inp->inp_pcbinfo->ipi_lock)) { /* lock inversion issue, mostly with udp multicast packets */ socket_unlock(so, 0); lck_rw_lock_exclusive(&inp->inp_pcbinfo->ipi_lock); socket_lock(so, 0); } inp->in6p_faddr = sin6->sin6_addr; inp->inp_fport = sin6->sin6_port; inp->inp_fifscope = sin6->sin6_scope_id; in6_verify_ifscope(&inp->in6p_faddr, inp->inp_fifscope); if (nstat_collect && SOCK_PROTO(so) == IPPROTO_UDP) { nstat_pcb_invalidate_cache(inp); } in_pcbrehash(inp); lck_rw_done(&inp->inp_pcbinfo->ipi_lock); done: if (outif != NULL) { ifnet_release(outif); } return error; } void in6_pcbdisconnect(struct inpcb *inp) { struct socket *so = inp->inp_socket; #if CONTENT_FILTER if (so) { so->so_state_change_cnt++; } #endif if (!lck_rw_try_lock_exclusive(&inp->inp_pcbinfo->ipi_lock)) { /* lock inversion issue, mostly with udp multicast packets */ socket_unlock(so, 0); lck_rw_lock_exclusive(&inp->inp_pcbinfo->ipi_lock); socket_lock(so, 0); } if (nstat_collect && SOCK_PROTO(so) == IPPROTO_UDP) { nstat_pcb_cache(inp); } bzero((caddr_t)&inp->in6p_faddr, sizeof(inp->in6p_faddr)); inp->inp_fport = 0; /* clear flowinfo - RFC 6437 */ inp->inp_flow &= ~IPV6_FLOWLABEL_MASK; in_pcbrehash(inp); lck_rw_done(&inp->inp_pcbinfo->ipi_lock); /* * A multipath subflow socket would have its SS_NOFDREF set by default, * so check for SOF_MP_SUBFLOW socket flag before detaching the PCB; * when the socket is closed for real, SOF_MP_SUBFLOW would be cleared. */ if (!(so->so_flags & SOF_MP_SUBFLOW) && (so->so_state & SS_NOFDREF)) { in6_pcbdetach(inp); } } void in6_pcbdetach(struct inpcb *inp) { struct socket *so = inp->inp_socket; if (so->so_pcb == NULL) { /* PCB has been disposed */ panic("%s: inp=%p so=%p proto=%d so_pcb is null!", __func__, inp, so, SOCK_PROTO(so)); /* NOTREACHED */ } #if IPSEC if (inp->in6p_sp != NULL) { (void) ipsec6_delete_pcbpolicy(inp); } #endif /* IPSEC */ if (inp->inp_stat != NULL && SOCK_PROTO(so) == IPPROTO_UDP) { if (inp->inp_stat->rxpackets == 0 && inp->inp_stat->txpackets == 0) { INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet6_dgram_no_data); } } /* * Let NetworkStatistics know this PCB is going away * before we detach it. */ if (nstat_collect && (SOCK_PROTO(so) == IPPROTO_TCP || SOCK_PROTO(so) == IPPROTO_UDP)) { nstat_pcb_detach(inp); } /* mark socket state as dead */ if (in_pcb_checkstate(inp, WNT_STOPUSING, 1) != WNT_STOPUSING) { panic("%s: so=%p proto=%d couldn't set to STOPUSING", __func__, so, SOCK_PROTO(so)); /* NOTREACHED */ } #if SKYWALK /* Free up the port in the namespace registrar if not in TIME_WAIT */ if (!(inp->inp_flags2 & INP2_TIMEWAIT)) { netns_release(&inp->inp_netns_token); netns_release(&inp->inp_wildcard_netns_token); } #endif /* SKYWALK */ if (!(so->so_flags & SOF_PCBCLEARING)) { struct ip_moptions *imo; struct ip6_moptions *im6o; inp->inp_vflag = 0; if (inp->in6p_options != NULL) { m_freem(inp->in6p_options); inp->in6p_options = NULL; } ip6_freepcbopts(inp->in6p_outputopts); inp->in6p_outputopts = NULL; ROUTE_RELEASE(&inp->in6p_route); /* free IPv4 related resources in case of mapped addr */ if (inp->inp_options != NULL) { (void) m_free(inp->inp_options); inp->inp_options = NULL; } im6o = inp->in6p_moptions; inp->in6p_moptions = NULL; if (im6o != NULL) { IM6O_REMREF(im6o); } imo = inp->inp_moptions; inp->inp_moptions = NULL; if (imo != NULL) { IMO_REMREF(imo); } sofreelastref(so, 0); inp->inp_state = INPCB_STATE_DEAD; /* makes sure we're not called twice from so_close */ so->so_flags |= SOF_PCBCLEARING; inpcb_gc_sched(inp->inp_pcbinfo, INPCB_TIMER_FAST); } } struct sockaddr * in6_sockaddr(in_port_t port, struct in6_addr *addr_p, uint32_t ifscope) { struct sockaddr_in6 *sin6; sin6 = SIN6(alloc_sockaddr(sizeof(*sin6), Z_WAITOK | Z_NOFAIL)); sin6->sin6_family = AF_INET6; sin6->sin6_port = port; sin6->sin6_addr = *addr_p; /* would be good to use sa6_recoverscope(), except for locking */ if (IN6_IS_SCOPE_EMBED(&sin6->sin6_addr)) { sin6->sin6_scope_id = ifscope; if (in6_embedded_scope) { in6_verify_ifscope(&sin6->sin6_addr, ifscope); sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); } } else { sin6->sin6_scope_id = 0; /* XXX */ } if (in6_embedded_scope && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) { sin6->sin6_addr.s6_addr16[1] = 0; } return SA(sin6); } void in6_sockaddr_s(in_port_t port, struct in6_addr *addr_p, struct sockaddr_in6 *sin6, uint32_t ifscope) { SOCKADDR_ZERO(sin6, sizeof(*sin6)); sin6->sin6_family = AF_INET6; sin6->sin6_len = sizeof(*sin6); sin6->sin6_port = port; sin6->sin6_addr = *addr_p; /* would be good to use sa6_recoverscope(), except for locking */ if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) { sin6->sin6_scope_id = ifscope; if (in6_embedded_scope) { in6_verify_ifscope(&sin6->sin6_addr, ifscope); sin6->sin6_scope_id = ntohs(sin6->sin6_addr.s6_addr16[1]); } } else { sin6->sin6_scope_id = 0; /* XXX */ } if (in6_embedded_scope && IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) { sin6->sin6_addr.s6_addr16[1] = 0; } } /* * The calling convention of in6_getsockaddr() and in6_getpeeraddr() was * modified to match the pru_sockaddr() and pru_peeraddr() entry points * in struct pr_usrreqs, so that protocols can just reference then directly * without the need for a wrapper function. */ int in6_getsockaddr(struct socket *so, struct sockaddr **nam) { struct inpcb *inp; struct in6_addr addr; in_port_t port; if ((inp = sotoinpcb(so)) == NULL) { return EINVAL; } port = inp->inp_lport; addr = inp->in6p_laddr; *nam = in6_sockaddr(port, &addr, inp->inp_lifscope); if (*nam == NULL) { return ENOBUFS; } return 0; } int in6_getsockaddr_s(struct socket *so, struct sockaddr_in6 *ss) { struct inpcb *inp; struct in6_addr addr; in_port_t port; VERIFY(ss != NULL); SOCKADDR_ZERO(ss, sizeof(*ss)); if ((inp = sotoinpcb(so)) == NULL) { return EINVAL; } port = inp->inp_lport; addr = inp->in6p_laddr; in6_sockaddr_s(port, &addr, ss, inp->inp_lifscope); return 0; } int in6_getpeeraddr(struct socket *so, struct sockaddr **nam) { struct inpcb *inp; struct in6_addr addr; in_port_t port; if ((inp = sotoinpcb(so)) == NULL) { return EINVAL; } port = inp->inp_fport; addr = inp->in6p_faddr; *nam = in6_sockaddr(port, &addr, inp->inp_fifscope); if (*nam == NULL) { return ENOBUFS; } return 0; } int in6_mapped_sockaddr(struct socket *so, struct sockaddr **nam) { struct inpcb *inp = sotoinpcb(so); int error; if (inp == NULL) { return EINVAL; } if (inp->inp_vflag & INP_IPV4) { error = in_getsockaddr(so, nam); if (error == 0) { error = in6_sin_2_v4mapsin6_in_sock(nam); } } else { /* scope issues will be handled in in6_getsockaddr(). */ error = in6_getsockaddr(so, nam); } return error; } int in6_mapped_peeraddr(struct socket *so, struct sockaddr **nam) { struct inpcb *inp = sotoinpcb(so); int error; if (inp == NULL) { return EINVAL; } if (inp->inp_vflag & INP_IPV4) { error = in_getpeeraddr(so, nam); if (error == 0) { error = in6_sin_2_v4mapsin6_in_sock(nam); } } else { /* scope issues will be handled in in6_getpeeraddr(). */ error = in6_getpeeraddr(so, nam); } return error; } /* * 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. */ void in6_pcbnotify(struct inpcbinfo *pcbinfo, struct sockaddr *dst, u_int fport_arg, const struct sockaddr *src, u_int lport_arg, int cmd, void *cmdarg, void (*notify)(struct inpcb *, int)) { struct inpcbhead *head = pcbinfo->ipi_listhead; struct inpcb *inp, *ninp; struct sockaddr_in6 sa6_src, *sa6_dst; uint16_t fport = (uint16_t)fport_arg, lport = (uint16_t)lport_arg; u_int32_t flowinfo; int errno; if ((unsigned)cmd >= PRC_NCMDS || dst->sa_family != AF_INET6) { return; } sa6_dst = SIN6(dst); if (IN6_IS_ADDR_UNSPECIFIED(&sa6_dst->sin6_addr)) { return; } /* * note that src can be NULL when we get notify by local fragmentation. */ sa6_src = (src == NULL) ? sa6_any : *SIN6(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; bzero((caddr_t)&sa6_src.sin6_addr, sizeof(sa6_src.sin6_addr)); if (cmd != PRC_HOSTDEAD) { notify = in6_rtchange; } } errno = inet6ctlerrmap[cmd]; lck_rw_lock_shared(&pcbinfo->ipi_lock); for (inp = LIST_FIRST(head); inp != NULL; inp = ninp) { ninp = LIST_NEXT(inp, inp_list); if (!(inp->inp_vflag & INP_IPV6)) { continue; } /* * 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 && cmdarg != NULL) { socket_lock(inp->inp_socket, 1); ip6_notify_pmtu(inp, SIN6(dst), (u_int32_t *)cmdarg); socket_unlock(inp->inp_socket, 1); } /* * Detect if we should notify the error. If no source and * destination ports are specifed, 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 && inp->inp_socket != NULL && flowinfo == (inp->inp_flow & IPV6_FLOWLABEL_MASK) && in6_are_addr_equal_scoped(&inp->in6p_laddr, &sa6_src.sin6_addr, inp->inp_lifscope, sa6_src.sin6_scope_id)) { goto do_notify; } else if (!in6_are_addr_equal_scoped(&inp->in6p_faddr, &sa6_dst->sin6_addr, inp->inp_fifscope, sa6_dst->sin6_scope_id) || inp->inp_socket == NULL || (lport && inp->inp_lport != lport) || (!IN6_IS_ADDR_UNSPECIFIED(&sa6_src.sin6_addr) && !in6_are_addr_equal_scoped(&inp->in6p_laddr, &sa6_src.sin6_addr, inp->inp_lifscope, sa6_src.sin6_scope_id)) || (fport && inp->inp_fport != fport)) { continue; } do_notify: if (notify) { if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) == WNT_STOPUSING) { continue; } socket_lock(inp->inp_socket, 1); (*notify)(inp, errno); (void) in_pcb_checkstate(inp, WNT_RELEASE, 1); socket_unlock(inp->inp_socket, 1); } } lck_rw_done(&pcbinfo->ipi_lock); } /* * Lookup a PCB based on the local address and port. */ struct inpcb * in6_pcblookup_local(struct inpcbinfo *pcbinfo, struct in6_addr *laddr, u_int lport_arg, uint32_t ifscope, int wild_okay) { struct inpcb *inp; int matchwild = 3, wildcard; uint16_t lport = (uint16_t)lport_arg; struct inpcbporthead *porthash; struct inpcb *match = NULL; struct inpcbport *phd; if (!wild_okay) { struct inpcbhead *head; /* * Look for an unconnected (wildcard foreign addr) PCB that * matches the local address and port we're looking for. */ head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->ipi_hashmask)]; LIST_FOREACH(inp, head, inp_hash) { if (!(inp->inp_vflag & INP_IPV6)) { continue; } if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && in6_are_addr_equal_scoped(&inp->in6p_laddr, laddr, inp->inp_lifscope, ifscope) && inp->inp_lport == lport) { /* * Found. */ return inp; } } /* * Not found. */ return NULL; } /* * Best fit PCB lookup. * * First see if this local port is in use by looking on the * port hash list. */ porthash = &pcbinfo->ipi_porthashbase[INP_PCBPORTHASH(lport, pcbinfo->ipi_porthashmask)]; LIST_FOREACH(phd, porthash, phd_hash) { if (phd->phd_port == lport) { break; } } if (phd != NULL) { /* * Port is in use by one or more PCBs. Look for best * fit. */ LIST_FOREACH(inp, &phd->phd_pcblist, inp_portlist) { wildcard = 0; if (!(inp->inp_vflag & INP_IPV6)) { continue; } if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { wildcard++; } if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr)) { if (IN6_IS_ADDR_UNSPECIFIED(laddr)) { wildcard++; } else if (!in6_are_addr_equal_scoped( &inp->in6p_laddr, laddr, inp->inp_lifscope, ifscope)) { continue; } } else { if (!IN6_IS_ADDR_UNSPECIFIED(laddr)) { wildcard++; } } if (wildcard < matchwild) { match = inp; matchwild = wildcard; if (matchwild == 0) { break; } } } } return match; } /* * 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 inpcb *in6p) { struct rtentry *rt; if ((rt = in6p->in6p_route.ro_rt) != NULL) { RT_LOCK(rt); if (rt->rt_flags & RTF_DYNAMIC) { /* * Prevent another thread from modifying rt_key, * rt_gateway via rt_setgate() after the rt_lock * is dropped by marking the route as defunct. */ rt->rt_flags |= RTF_CONDEMNED; RT_UNLOCK(rt); (void) rtrequest(RTM_DELETE, rt_key(rt), rt->rt_gateway, rt_mask(rt), rt->rt_flags, NULL); } else { RT_UNLOCK(rt); } /* * A new route can be allocated * the next time output is attempted. */ } ROUTE_RELEASE(&in6p->in6p_route); } /* * After a routing change, flush old routing * and allocate a (hopefully) better one. */ void in6_rtchange(struct inpcb *inp, int errno) { #pragma unused(errno) /* * A new route can be allocated the next time * output is attempted. */ ROUTE_RELEASE(&inp->in6p_route); } /* * Check if PCB exists hash list. Also returns uid and gid of socket */ int in6_pcblookup_hash_exists(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport_arg, uint32_t fifscope, struct in6_addr *laddr, u_int lport_arg, uint32_t lifscope, int wildcard, uid_t *uid, gid_t *gid, struct ifnet *ifp, bool relaxed) { struct inpcbhead *head; struct inpcb *inp; uint16_t fport = (uint16_t)fport_arg, lport = (uint16_t)lport_arg; int found; *uid = UID_MAX; *gid = GID_MAX; lck_rw_lock_shared(&pcbinfo->ipi_lock); /* * First look for an exact match. */ head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport, pcbinfo->ipi_hashmask)]; LIST_FOREACH(inp, head, inp_hash) { if (!(inp->inp_vflag & INP_IPV6)) { continue; } if (inp_restricted_recv(inp, ifp)) { continue; } #if NECP if (!necp_socket_is_allowed_to_recv_on_interface(inp, ifp)) { continue; } #endif /* NECP */ if (((in6_are_addr_equal_scoped(&inp->in6p_faddr, faddr, inp->inp_fifscope, fifscope) && in6_are_addr_equal_scoped(&inp->in6p_laddr, laddr, inp->inp_lifscope, lifscope)) || (relaxed && IN6_ARE_ADDR_EQUAL(&inp->in6p_faddr, faddr) && IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr))) && inp->inp_fport == fport && inp->inp_lport == lport) { if ((found = (inp->inp_socket != NULL))) { /* * Found. Check if pcb is still valid */ *uid = kauth_cred_getuid( inp->inp_socket->so_cred); *gid = kauth_cred_getgid( inp->inp_socket->so_cred); } lck_rw_done(&pcbinfo->ipi_lock); return found; } } if (wildcard) { struct inpcb *local_wild = NULL; head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->ipi_hashmask)]; LIST_FOREACH(inp, head, inp_hash) { if (!(inp->inp_vflag & INP_IPV6)) { continue; } if (inp_restricted_recv(inp, ifp)) { continue; } #if NECP if (!necp_socket_is_allowed_to_recv_on_interface(inp, ifp)) { continue; } #endif /* NECP */ if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && inp->inp_lport == lport) { if (in6_are_addr_equal_scoped(&inp->in6p_laddr, laddr, inp->inp_lifscope, lifscope) || (relaxed && IN6_ARE_ADDR_EQUAL(&inp->in6p_laddr, laddr))) { found = (inp->inp_socket != NULL); if (found) { *uid = kauth_cred_getuid( inp->inp_socket->so_cred); *gid = kauth_cred_getgid( inp->inp_socket->so_cred); } lck_rw_done(&pcbinfo->ipi_lock); return found; } else if (IN6_IS_ADDR_UNSPECIFIED( &inp->in6p_laddr)) { local_wild = inp; } } } if (local_wild) { if ((found = (local_wild->inp_socket != NULL))) { *uid = kauth_cred_getuid( local_wild->inp_socket->so_cred); *gid = kauth_cred_getgid( local_wild->inp_socket->so_cred); } lck_rw_done(&pcbinfo->ipi_lock); return found; } } /* * Not found. */ lck_rw_done(&pcbinfo->ipi_lock); return 0; } /* * Lookup PCB in hash list. */ struct inpcb * in6_pcblookup_hash(struct inpcbinfo *pcbinfo, struct in6_addr *faddr, u_int fport_arg, uint32_t fifscope, struct in6_addr *laddr, u_int lport_arg, uint32_t lifscope, int wildcard, struct ifnet *ifp) { struct inpcbhead *head; struct inpcb *inp; uint16_t fport = (uint16_t)fport_arg, lport = (uint16_t)lport_arg; lck_rw_lock_shared(&pcbinfo->ipi_lock); /* * First look for an exact match. */ head = &pcbinfo->ipi_hashbase[INP_PCBHASH(faddr->s6_addr32[3] /* XXX */, lport, fport, pcbinfo->ipi_hashmask)]; LIST_FOREACH(inp, head, inp_hash) { if (!(inp->inp_vflag & INP_IPV6)) { continue; } if (inp_restricted_recv(inp, ifp)) { continue; } #if NECP if (!necp_socket_is_allowed_to_recv_on_interface(inp, ifp)) { continue; } #endif /* NECP */ if (in6_are_addr_equal_scoped(&inp->in6p_faddr, faddr, inp->inp_fifscope, fifscope) && in6_are_addr_equal_scoped(&inp->in6p_laddr, laddr, inp->inp_lifscope, lifscope) && inp->inp_fport == fport && inp->inp_lport == lport) { /* * Found. Check if pcb is still valid */ if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) != WNT_STOPUSING) { lck_rw_done(&pcbinfo->ipi_lock); return inp; } else { /* it's there but dead, say it isn't found */ lck_rw_done(&pcbinfo->ipi_lock); return NULL; } } } if (wildcard) { struct inpcb *local_wild = NULL; head = &pcbinfo->ipi_hashbase[INP_PCBHASH(INADDR_ANY, lport, 0, pcbinfo->ipi_hashmask)]; LIST_FOREACH(inp, head, inp_hash) { if (!(inp->inp_vflag & INP_IPV6)) { continue; } if (inp_restricted_recv(inp, ifp)) { continue; } #if NECP if (!necp_socket_is_allowed_to_recv_on_interface(inp, ifp)) { continue; } #endif /* NECP */ if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr) && inp->inp_lport == lport) { if (in6_are_addr_equal_scoped(&inp->in6p_laddr, laddr, inp->inp_lifscope, lifscope)) { if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) != WNT_STOPUSING) { lck_rw_done(&pcbinfo->ipi_lock); return inp; } else { /* dead; say it isn't found */ lck_rw_done(&pcbinfo->ipi_lock); return NULL; } } else if (IN6_IS_ADDR_UNSPECIFIED( &inp->in6p_laddr)) { local_wild = inp; } } } if (local_wild && in_pcb_checkstate(local_wild, WNT_ACQUIRE, 0) != WNT_STOPUSING) { lck_rw_done(&pcbinfo->ipi_lock); return local_wild; } else { lck_rw_done(&pcbinfo->ipi_lock); return NULL; } } /* * Not found. */ lck_rw_done(&pcbinfo->ipi_lock); return NULL; } void init_sin6(struct sockaddr_in6 *sin6, struct mbuf *m) { struct ip6_hdr *ip; ip = mtod(m, struct ip6_hdr *); SOCKADDR_ZERO(sin6, sizeof(*sin6)); sin6->sin6_len = sizeof(*sin6); sin6->sin6_family = AF_INET6; sin6->sin6_addr = ip->ip6_src; if (IN6_IS_SCOPE_LINKLOCAL(&sin6->sin6_addr)) { if (in6_embedded_scope) { sin6->sin6_addr.s6_addr16[1] = 0; } if ((m->m_pkthdr.pkt_flags & (PKTF_LOOP | PKTF_IFAINFO)) == (PKTF_LOOP | PKTF_IFAINFO)) { sin6->sin6_scope_id = m->m_pkthdr.src_ifindex; } else if (m->m_pkthdr.rcvif != NULL) { sin6->sin6_scope_id = m->m_pkthdr.rcvif->if_index; } } } /* * The following routines implement this scheme: * * Callers of ip6_output() that intend to cache the route in the inpcb pass * a local copy of the struct route to ip6_output(). Using a local copy of * the cached route significantly simplifies things as IP no longer has to * worry about having exclusive access to the passed in struct route, since * it's defined in the caller's stack; in essence, this allows for a lock- * less operation when updating the struct route at the IP level and below, * whenever necessary. The scheme works as follows: * * Prior to dropping the socket's lock and calling ip6_output(), the caller * copies the struct route from the inpcb into its stack, and adds a reference * to the cached route entry, if there was any. The socket's lock is then * dropped and ip6_output() is called with a pointer to the copy of struct * route defined on the stack (not to the one in the inpcb.) * * Upon returning from ip6_output(), the caller then acquires the socket's * lock and synchronizes the cache; if there is no route cached in the inpcb, * it copies the local copy of struct route (which may or may not contain any * route) back into the cache; otherwise, if the inpcb has a route cached in * it, the one in the local copy will be freed, if there's any. Trashing the * cached route in the inpcb can be avoided because ip6_output() is single- * threaded per-PCB (i.e. multiple transmits on a PCB are always serialized * by the socket/transport layer.) */ void in6p_route_copyout(struct inpcb *inp, struct route_in6 *dst) { struct route_in6 *src = &inp->in6p_route; socket_lock_assert_owned(inp->inp_socket); /* Minor sanity check */ if (src->ro_rt != NULL && rt_key(src->ro_rt)->sa_family != AF_INET6) { panic("%s: wrong or corrupted route: %p", __func__, src); } route_copyout((struct route *)dst, (struct route *)src, sizeof(*dst)); } void in6p_route_copyin(struct inpcb *inp, struct route_in6 *src) { struct route_in6 *dst = &inp->in6p_route; socket_lock_assert_owned(inp->inp_socket); /* Minor sanity check */ if (src->ro_rt != NULL && rt_key(src->ro_rt)->sa_family != AF_INET6) { panic("%s: wrong or corrupted route: %p", __func__, src); } route_copyin((struct route *)src, (struct route *)dst, sizeof(*src)); }