/* $FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.6.2.13 2003/01/24 05:11:35 sam Exp $ */ /* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Copyright (c) 1982, 1986, 1989, 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. * * @(#)udp_var.h 8.1 (Berkeley) 6/10/93 */ #include "opt_inet.h" #include "opt_inet6.h" #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 #include #include #include /* * UDP protocol inplementation. * Per RFC 768, August, 1980. */ extern struct protosw inetsw[]; static int in6_mcmatch (struct inpcb *, struct in6_addr *, struct ifnet *); static int in6_mcmatch(struct inpcb *in6p, struct in6_addr *ia6, struct ifnet *ifp) { struct ip6_moptions *im6o = in6p->in6p_moptions; struct in6_multi_mship *imm; if (im6o == NULL) return 0; for (imm = im6o->im6o_memberships.lh_first; imm != NULL; imm = imm->i6mm_chain.le_next) { if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, ia6)) return 1; } return 0; } int udp6_input(struct mbuf **mp, int *offp, int proto) { struct mbuf *m = *mp; struct ip6_hdr *ip6; struct udphdr *uh; struct inpcb *in6p; struct mbuf *opts = NULL; int off = *offp; int plen, ulen; struct sockaddr_in6 udp_in6; struct socket *so; struct inpcbinfo *pcbinfo = &udbinfo[0]; IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); ip6 = mtod(m, struct ip6_hdr *); udp_stat.udps_ipackets++; plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6); uh = (struct udphdr *)((caddr_t)ip6 + off); ulen = ntohs((u_short)uh->uh_ulen); if (plen != ulen) { udp_stat.udps_badlen++; goto bad; } /* * Checksum extended UDP header and data. */ if (uh->uh_sum == 0) udp_stat.udps_nosum++; else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { udp_stat.udps_badsum++; goto bad; } if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { struct inpcb *last, *marker; /* * Deliver a multicast datagram to all sockets * for which the local and remote addresses and ports match * those of the incoming datagram. This allows more than * one process to receive multicasts on the same port. * (This really ought to be done for unicast datagrams as * well, but that would cause problems with existing * applications that open both address-specific sockets and * a wildcard socket listening to the same port -- they would * end up receiving duplicates of every unicast datagram. * Those applications open the multiple sockets to overcome an * inadequacy of the UDP socket interface, but for backwards * compatibility we avoid the problem here rather than * fixing the interface. Maybe 4.5BSD will remedy this?) */ /* * In a case that laddr should be set to the link-local * address (this happens in RIPng), the multicast address * specified in the received packet does not match with * laddr. To cure this situation, the matching is relaxed * if the receiving interface is the same as one specified * in the socket and if the destination multicast address * matches one of the multicast groups specified in the socket. */ /* * Construct sockaddr format source address. */ init_sin6(&udp_in6, m); /* general init */ udp_in6.sin6_port = uh->uh_sport; /* * KAME note: traditionally we dropped udpiphdr from mbuf here. */ /* * Locate pcb(s) for datagram. * (Algorithm copied from raw_intr().) */ last = NULL; marker = in_pcbmarker(); GET_PCBINFO_TOKEN(pcbinfo); LIST_INSERT_HEAD(&pcbinfo->pcblisthead, marker, inp_list); while ((in6p = LIST_NEXT(marker, inp_list)) != NULL) { LIST_REMOVE(marker, inp_list); LIST_INSERT_AFTER(in6p, marker, inp_list); if (in6p->inp_flags & INP_PLACEMARKER) continue; if (!INP_ISIPV6(in6p)) continue; if (in6p->in6p_lport != uh->uh_dport) continue; if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst) && !in6_mcmatch(in6p, &ip6->ip6_dst, m->m_pkthdr.rcvif)) continue; } if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src) || in6p->in6p_fport != uh->uh_sport) continue; } if (last != NULL) { struct mbuf *n; if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { /* * KAME NOTE: do not * m_copy(m, offset, ...) above. * ssb_appendaddr() expects M_PKTHDR, * and m_copy() will copy M_PKTHDR * only if offset is 0. */ so = last->in6p_socket; if ((last->in6p_flags & IN6P_CONTROLOPTS) || (so->so_options & SO_TIMESTAMP)) { ip6_savecontrol(last, &opts, ip6, n); } m_adj(n, off + sizeof(struct udphdr)); lwkt_gettoken(&so->so_rcv.ssb_token); if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6, n, opts) == 0) { m_freem(n); if (opts) m_freem(opts); udp_stat.udps_fullsock++; soroverflow(so); } else { sorwakeup(so); } lwkt_reltoken(&so->so_rcv.ssb_token); opts = NULL; } } last = in6p; /* * Don't look for additional matches if this one does * not have either the SO_REUSEPORT or SO_REUSEADDR * socket options set. This heuristic avoids searching * through all pcbs in the common case of a non-shared * port. It assumes that an application will never * clear these options after setting them. */ if ((last->in6p_socket->so_options & (SO_REUSEPORT | SO_REUSEADDR)) == 0) break; } LIST_REMOVE(marker, inp_list); REL_PCBINFO_TOKEN(pcbinfo); if (last == NULL) { /* * No matching pcb found; discard datagram. * (No need to send an ICMP Port Unreachable * for a broadcast or multicast datgram.) */ udp_stat.udps_noport++; udp_stat.udps_noportmcast++; goto bad; } if (last->in6p_flags & IN6P_CONTROLOPTS || last->in6p_socket->so_options & SO_TIMESTAMP) ip6_savecontrol(last, &opts, ip6, m); m_adj(m, off + sizeof(struct udphdr)); so = last->in6p_socket; lwkt_gettoken(&so->so_rcv.ssb_token); if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6, m, opts) == 0) { udp_stat.udps_fullsock++; soroverflow(so); lwkt_reltoken(&so->so_rcv.ssb_token); goto bad; } sorwakeup(so); lwkt_reltoken(&so->so_rcv.ssb_token); return IPPROTO_DONE; } /* * Locate pcb for datagram. */ in6p = in6_pcblookup_hash(pcbinfo, &ip6->ip6_src, uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif); if (in6p == NULL) { if (log_in_vain) { char buf[INET6_ADDRSTRLEN]; strcpy(buf, ip6_sprintf(&ip6->ip6_dst)); log(LOG_INFO, "Connection attempt to UDP [%s]:%d from [%s]:%d\n", buf, ntohs(uh->uh_dport), ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport)); } udp_stat.udps_noport++; if (m->m_flags & M_MCAST) { kprintf("UDP6: M_MCAST is set in a unicast packet.\n"); udp_stat.udps_noportmcast++; goto bad; } icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); return IPPROTO_DONE; } /* * Construct sockaddr format source address. * Stuff source address and datagram in user buffer. */ init_sin6(&udp_in6, m); /* general init */ udp_in6.sin6_port = uh->uh_sport; if (in6p->in6p_flags & IN6P_CONTROLOPTS || in6p->in6p_socket->so_options & SO_TIMESTAMP) ip6_savecontrol(in6p, &opts, ip6, m); m_adj(m, off + sizeof(struct udphdr)); so = in6p->in6p_socket; lwkt_gettoken(&so->so_rcv.ssb_token); if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&udp_in6, m, opts) == 0) { udp_stat.udps_fullsock++; soroverflow(so); lwkt_reltoken(&so->so_rcv.ssb_token); goto bad; } sorwakeup(so); lwkt_reltoken(&so->so_rcv.ssb_token); return IPPROTO_DONE; bad: if (m) m_freem(m); if (opts) m_freem(opts); return IPPROTO_DONE; } void udp6_ctlinput(netmsg_t msg) { int cmd = msg->ctlinput.nm_cmd; struct sockaddr *sa = msg->ctlinput.nm_arg; void *d = msg->ctlinput.nm_extra; struct udphdr uh; struct ip6_hdr *ip6; struct mbuf *m; int off = 0; struct ip6ctlparam *ip6cp = NULL; const struct sockaddr_in6 *sa6_src = NULL; inp_notify_t notify = udp_notify; struct udp_portonly { u_int16_t uh_sport; u_int16_t uh_dport; } *uhp; if (sa->sa_family != AF_INET6 || sa->sa_len != sizeof(struct sockaddr_in6)) goto out; if ((unsigned)cmd >= PRC_NCMDS) goto out; if (PRC_IS_REDIRECT(cmd)) notify = in6_rtchange, d = NULL; else if (cmd == PRC_HOSTDEAD) d = NULL; else if (inet6ctlerrmap[cmd] == 0) goto out; /* if the parameter is from icmp6, decode it. */ if (d != NULL) { ip6cp = (struct ip6ctlparam *)d; m = ip6cp->ip6c_m; ip6 = ip6cp->ip6c_ip6; off = ip6cp->ip6c_off; sa6_src = ip6cp->ip6c_src; } else { m = NULL; ip6 = NULL; sa6_src = &sa6_any; } if (ip6) { /* * XXX: We assume that when IPV6 is non NULL, * M and OFF are valid. */ /* check if we can safely examine src and dst ports */ if (m->m_pkthdr.len < off + sizeof(*uhp)) return; bzero(&uh, sizeof(uh)); m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh); in6_pcbnotify(&udbinfo[0], sa, uh.uh_dport, (struct sockaddr *)ip6cp->ip6c_src, uh.uh_sport, cmd, 0, notify); } else { in6_pcbnotify(&udbinfo[0], sa, 0, (const struct sockaddr *)sa6_src, 0, cmd, 0, notify); } out: lwkt_replymsg(&msg->ctlinput.base.lmsg, 0); } static int udp6_getcred(SYSCTL_HANDLER_ARGS) { struct sockaddr_in6 addrs[2]; struct inpcb *inp; int error; error = priv_check(req->td, PRIV_ROOT); if (error) return (error); if (req->newlen != sizeof(addrs)) return (EINVAL); if (req->oldlen != sizeof(struct ucred)) return (EINVAL); error = SYSCTL_IN(req, addrs, sizeof(addrs)); if (error) return (error); crit_enter(); inp = in6_pcblookup_hash(&udbinfo[0], &addrs[1].sin6_addr, addrs[1].sin6_port, &addrs[0].sin6_addr, addrs[0].sin6_port, 1, NULL); if (!inp || !inp->inp_socket) { error = ENOENT; goto out; } error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred)); out: crit_exit(); return (error); } SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW, 0, 0, udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection"); /* * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() * will sofree() it when we return. */ static void udp6_abort(netmsg_t msg) { struct socket *so = msg->abort.base.nm_so; struct inpcb *inp; int error; inp = so->so_pcb; if (inp) { soisdisconnected(so); in6_pcbdetach(inp); error = 0; } else { error = EINVAL; } lwkt_replymsg(&msg->abort.base.lmsg, error); } static void udp6_attach(netmsg_t msg) { struct socket *so = msg->attach.base.nm_so; struct pru_attach_info *ai = msg->attach.nm_ai; struct inpcb *inp; int error; inp = so->so_pcb; if (inp != NULL) { error = EINVAL; goto out; } if (so->so_snd.ssb_hiwat == 0 || so->so_rcv.ssb_hiwat == 0) { error = soreserve(so, udp_sendspace, udp_recvspace, ai->sb_rlimit); if (error) goto out; } error = in_pcballoc(so, &udbinfo[0]); if (error) goto out; inp = (struct inpcb *)so->so_pcb; inp->in6p_hops = -1; /* use kernel default */ inp->in6p_cksum = -1; /* just to be sure */ /* * XXX: ugly!! * IPv4 TTL initialization is necessary for an IPv6 socket as well, * because the socket may be bound to an IPv6 wildcard address, * which may match an IPv4-mapped IPv6 address. */ inp->inp_ip_ttl = ip_defttl; error = 0; out: lwkt_replymsg(&msg->attach.base.lmsg, error); } static void udp6_bind(netmsg_t msg) { struct socket *so =msg->bind.base.nm_so; struct sockaddr *nam = msg->bind.nm_nam; struct thread *td = msg->bind.nm_td; struct sockaddr_in6 *sin6_p = (struct sockaddr_in6 *)nam; struct inpcb *inp; int error; inp = so->so_pcb; if (inp == NULL) { error = EINVAL; goto out; } error = in6_pcbbind(inp, nam, td); if (error == 0) { if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) inp->inp_flags |= INP_WASBOUND_NOTANY; in_pcbinswildcardhash(inp); } out: lwkt_replymsg(&msg->bind.base.lmsg, error); } static void udp6_connect(netmsg_t msg) { struct socket *so = msg->connect.base.nm_so; struct sockaddr *nam = msg->connect.nm_nam; struct thread *td = msg->connect.nm_td; struct sockaddr_in6 *sin6_p; struct inpcb *inp; int error; inp = so->so_pcb; if (inp == NULL) { error = EINVAL; goto out; } sin6_p = (struct sockaddr_in6 *)nam; if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) { error = EADDRNOTAVAIL; goto out; } if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { error = EISCONN; goto out; } if (inp->inp_flags & INP_WILDCARD) in_pcbremwildcardhash(inp); if (!prison_remote_ip(td, nam)) { error = EAFNOSUPPORT; /* IPv4 only jail */ goto out; } error = in6_pcbconnect(inp, nam, td); if (error == 0) { soisconnected(so); } else if (error == EAFNOSUPPORT) { /* connection dissolved */ /* * Follow traditional BSD behavior and retain * the local port binding. But, fix the old misbehavior * of overwriting any previously bound local address. */ if (!(inp->inp_flags & INP_WASBOUND_NOTANY)) inp->in6p_laddr = kin6addr_any; in_pcbinswildcardhash(inp); } out: lwkt_replymsg(&msg->connect.base.lmsg, error); } static void udp6_detach(netmsg_t msg) { struct socket *so = msg->detach.base.nm_so; struct inpcb *inp; int error; inp = so->so_pcb; if (inp) { in6_pcbdetach(inp); error = 0; } else { error = EINVAL; } lwkt_replymsg(&msg->detach.base.lmsg, error); } static void udp6_disconnect(netmsg_t msg) { struct socket *so = msg->disconnect.base.nm_so; struct inpcb *inp; int error; inp = so->so_pcb; if (inp == NULL) { error = EINVAL; goto out; } if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) { error = ENOTCONN; } else { in6_pcbdisconnect(inp); soclrstate(so, SS_ISCONNECTED); /* XXX */ error = 0; } out: lwkt_replymsg(&msg->disconnect.base.lmsg, error); } static void udp6_send(netmsg_t msg) { struct socket *so = msg->send.base.nm_so; struct mbuf *m = msg->send.nm_m; struct sockaddr *addr = msg->send.nm_addr; struct mbuf *control = msg->send.nm_control; struct thread *td = msg->send.nm_td; struct inpcb *inp; int error = 0; inp = so->so_pcb; if (inp == NULL) { error = EINVAL; goto bad; } if (addr) { struct sockaddr_in6 *sin6; if (addr->sa_len != sizeof(struct sockaddr_in6)) { error = EINVAL; goto bad; } if (addr->sa_family != AF_INET6) { error = EAFNOSUPPORT; goto bad; } sin6 = (struct sockaddr_in6 *)addr; if (IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { error = EADDRNOTAVAIL; goto bad; } } error = udp6_output(inp, m, addr, control, td); lwkt_replymsg(&msg->send.base.lmsg, error); return; bad: m_freem(m); lwkt_replymsg(&msg->send.base.lmsg, error); } struct pr_usrreqs udp6_usrreqs = { .pru_abort = udp6_abort, .pru_accept = pr_generic_notsupp, .pru_attach = udp6_attach, .pru_bind = udp6_bind, .pru_connect = udp6_connect, .pru_connect2 = pr_generic_notsupp, .pru_control = in6_control_dispatch, .pru_detach = udp6_detach, .pru_disconnect = udp6_disconnect, .pru_listen = pr_generic_notsupp, .pru_peeraddr = in6_setpeeraddr_dispatch, .pru_rcvd = pr_generic_notsupp, .pru_rcvoob = pr_generic_notsupp, .pru_send = udp6_send, .pru_sense = pru_sense_null, .pru_shutdown = udp_shutdown, .pru_sockaddr = in6_setsockaddr_dispatch, .pru_sosend = sosend, .pru_soreceive = soreceive };