/* $OpenBSD: udp_usrreq.c,v 1.77 2002/05/31 04:43:26 angelos Exp $ */ /* $NetBSD: udp_usrreq.c,v 1.28 1996/03/16 23:54:03 christos Exp $ */ /* * Copyright (c) 1982, 1986, 1988, 1990, 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. * * @(#)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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET6 #ifndef INET #include #endif #include extern int ip6_defhlim; #endif /* INET6 */ /* * UDP protocol implementation. * Per RFC 768, August, 1980. */ int udpcksum = 1; static void udp_detach(struct inpcb *); static void udp_notify(struct inpcb *, int); static struct mbuf *udp_saveopt(caddr_t, int, int); #ifndef UDBHASHSIZE #define UDBHASHSIZE 128 #endif int udbhashsize = UDBHASHSIZE; /* from in_pcb.c */ extern struct baddynamicports baddynamicports; void udp_init() { in_pcbinit(&udbtable, udbhashsize); } #ifdef INET6 int udp6_input(mp, offp, proto) struct mbuf **mp; int *offp, proto; { struct mbuf *m = *mp; #if defined(NFAITH) && 0 < NFAITH if (m->m_pkthdr.rcvif) { if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) { /* XXX send icmp6 host/port unreach? */ m_freem(m); return IPPROTO_DONE; } } #endif udp_input(m, *offp, proto); return IPPROTO_DONE; } #endif void udp_input(struct mbuf *m, ...) { register struct ip *ip; register struct udphdr *uh; register struct inpcb *inp; struct mbuf *opts = 0; int len; struct ip save_ip; int iphlen; va_list ap; u_int16_t savesum; union { struct sockaddr sa; struct sockaddr_in sin; #ifdef INET6 struct sockaddr_in6 sin6; #endif /* INET6 */ } srcsa, dstsa; #ifdef INET6 struct ip6_hdr *ipv6; #endif /* INET6 */ #ifdef IPSEC struct m_tag *mtag; struct tdb_ident *tdbi; struct tdb *tdb; int error, s; #endif /* IPSEC */ va_start(ap, m); iphlen = va_arg(ap, int); va_end(ap); udpstat.udps_ipackets++; switch (mtod(m, struct ip *)->ip_v) { case 4: ip = mtod(m, struct ip *); #ifdef INET6 ipv6 = NULL; #endif /* INET6 */ srcsa.sa.sa_family = AF_INET; break; #ifdef INET6 case 6: ip = NULL; ipv6 = mtod(m, struct ip6_hdr *); srcsa.sa.sa_family = AF_INET6; break; #endif /* INET6 */ default: goto bad; } /* * Strip IP options, if any; should skip this, * make available to user, and use on returned packets, * but we don't yet have a way to check the checksum * with options still present. */ /* * (contd. from above...) Furthermore, we may want to strip options * for such things as ICMP errors, where options just get in the way. */ if (ip && iphlen > sizeof (struct ip)) { ip_stripoptions(m, (struct mbuf *)0); iphlen = sizeof(struct ip); } /* * Get IP and UDP header together in first mbuf. */ if (m->m_len < iphlen + sizeof(struct udphdr)) { if ((m = m_pullup2(m, iphlen + sizeof(struct udphdr))) == NULL) { udpstat.udps_hdrops++; return; } #ifdef INET6 if (ipv6) ipv6 = mtod(m, struct ip6_hdr *); else #endif /* INET6 */ ip = mtod(m, struct ip *); } uh = (struct udphdr *)(mtod(m, caddr_t) + iphlen); /* Check for illegal destination port 0 */ if (uh->uh_dport == 0) { udpstat.udps_noport++; goto bad; } /* * Make mbuf data length reflect UDP length. * If not enough data to reflect UDP length, drop. */ len = ntohs((u_int16_t)uh->uh_ulen); if (m->m_pkthdr.len - iphlen != len) { if (len > (m->m_pkthdr.len - iphlen) || len < sizeof(struct udphdr)) { udpstat.udps_badlen++; goto bad; } m_adj(m, len - (m->m_pkthdr.len - iphlen)); } /* * Save a copy of the IP header in case we want restore it * for sending an ICMP error message in response. */ if (ip) save_ip = *ip; /* * Checksum extended UDP header and data. * from W.R.Stevens: check incoming udp cksums even if * udpcksum is not set. */ savesum = uh->uh_sum; #ifdef INET6 if (ipv6) { /* Be proactive about malicious use of IPv4 mapped address */ if (IN6_IS_ADDR_V4MAPPED(&ipv6->ip6_src) || IN6_IS_ADDR_V4MAPPED(&ipv6->ip6_dst)) { /* XXX stat */ goto bad; } /* * In IPv6, the UDP checksum is ALWAYS used. */ if ((uh->uh_sum = in6_cksum(m, IPPROTO_UDP, iphlen, len))) { udpstat.udps_badsum++; goto bad; } } else #endif /* INET6 */ if (uh->uh_sum) { if ((m->m_pkthdr.csum & M_UDP_CSUM_IN_OK) == 0) { if (m->m_pkthdr.csum & M_UDP_CSUM_IN_BAD) { udpstat.udps_badsum++; udpstat.udps_inhwcsum++; m_freem(m); return; } bzero(((struct ipovly *)ip)->ih_x1, sizeof ((struct ipovly *)ip)->ih_x1); ((struct ipovly *)ip)->ih_len = uh->uh_ulen; if ((uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) != 0) { udpstat.udps_badsum++; m_freem(m); return; } } else { m->m_pkthdr.csum &= ~M_UDP_CSUM_IN_OK; udpstat.udps_inhwcsum++; } } else udpstat.udps_nosum++; switch (srcsa.sa.sa_family) { case AF_INET: bzero(&srcsa, sizeof(struct sockaddr_in)); srcsa.sin.sin_len = sizeof(struct sockaddr_in); srcsa.sin.sin_family = AF_INET; srcsa.sin.sin_port = uh->uh_sport; srcsa.sin.sin_addr = ip->ip_src; bzero(&dstsa, sizeof(struct sockaddr_in)); dstsa.sin.sin_len = sizeof(struct sockaddr_in); dstsa.sin.sin_family = AF_INET; dstsa.sin.sin_port = uh->uh_dport; dstsa.sin.sin_addr = ip->ip_dst; break; #ifdef INET6 case AF_INET6: bzero(&srcsa, sizeof(struct sockaddr_in6)); srcsa.sin6.sin6_len = sizeof(struct sockaddr_in6); srcsa.sin6.sin6_family = AF_INET6; srcsa.sin6.sin6_port = uh->uh_sport; #if 0 /*XXX inbound flowinfo */ srcsa.sin6.sin6_flowinfo = htonl(0x0fffffff) & ipv6->ip6_flow; #endif /* KAME hack: recover scopeid */ (void)in6_recoverscope(&srcsa.sin6, &ipv6->ip6_src, m->m_pkthdr.rcvif); bzero(&dstsa, sizeof(struct sockaddr_in6)); dstsa.sin6.sin6_len = sizeof(struct sockaddr_in6); dstsa.sin6.sin6_family = AF_INET6; dstsa.sin6.sin6_port = uh->uh_dport; /* KAME hack: recover scopeid */ (void)in6_recoverscope(&dstsa.sin6, &ipv6->ip6_dst, m->m_pkthdr.rcvif); break; #endif /* INET6 */ } #ifdef INET6 if ((ipv6 && IN6_IS_ADDR_MULTICAST(&ipv6->ip6_dst)) || (ip && IN_MULTICAST(ip->ip_dst.s_addr)) || (ip && in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif))) #else /* INET6 */ if (IN_MULTICAST(ip->ip_dst.s_addr) || in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) #endif /* INET6 */ { struct socket *last; /* * Deliver a multicast or broadcast 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 multi/broadcasts 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?) */ iphlen += sizeof(struct udphdr); /* * Locate pcb(s) for datagram. * (Algorithm copied from raw_intr().) */ last = NULL; for (inp = udbtable.inpt_queue.cqh_first; inp != (struct inpcb *)&udbtable.inpt_queue; inp = inp->inp_queue.cqe_next) { #ifdef INET6 /* don't accept it if AF does not match */ if (ipv6 && !(inp->inp_flags & INP_IPV6)) continue; if (!ipv6 && (inp->inp_flags & INP_IPV6)) continue; #endif if (inp->inp_lport != uh->uh_dport) continue; #ifdef INET6 if (ipv6) { if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) if (!IN6_ARE_ADDR_EQUAL(&inp->inp_laddr6, &ipv6->ip6_dst)) continue; } else #endif /* INET6 */ if (inp->inp_laddr.s_addr != INADDR_ANY) { if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) continue; } #ifdef INET6 if (ipv6) { if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) if (!IN6_ARE_ADDR_EQUAL(&inp->inp_faddr6, &ipv6->ip6_src) || inp->inp_fport != uh->uh_sport) continue; } else #endif /* INET6 */ if (inp->inp_faddr.s_addr != INADDR_ANY) { if (inp->inp_faddr.s_addr != ip->ip_src.s_addr || inp->inp_fport != uh->uh_sport) continue; } if (last != NULL) { struct mbuf *n; if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { opts = NULL; #ifdef INET6 if (ipv6 && (inp->inp_flags & IN6P_CONTROLOPTS)) ip6_savecontrol(inp, &opts, ipv6, n); #endif /* INET6 */ m_adj(n, iphlen); if (sbappendaddr(&last->so_rcv, &srcsa.sa, n, opts) == 0) { m_freem(n); if (opts) m_freem(opts); udpstat.udps_fullsock++; } else sorwakeup(last); opts = NULL; } } last = inp->inp_socket; /* * 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->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) break; } if (last == NULL) { /* * No matching pcb found; discard datagram. * (No need to send an ICMP Port Unreachable * for a broadcast or multicast datgram.) */ udpstat.udps_noportbcast++; goto bad; } opts = NULL; #ifdef INET6 if (ipv6 && (inp->inp_flags & IN6P_CONTROLOPTS)) ip6_savecontrol(inp, &opts, ipv6, m); #endif /* INET6 */ m_adj(m, iphlen); if (sbappendaddr(&last->so_rcv, &srcsa.sa, m, opts) == 0) { udpstat.udps_fullsock++; goto bad; } sorwakeup(last); return; } /* * Locate pcb for datagram. */ #ifdef INET6 if (ipv6) inp = in6_pcbhashlookup(&udbtable, &ipv6->ip6_src, uh->uh_sport, &ipv6->ip6_dst, uh->uh_dport); else #endif /* INET6 */ inp = in_pcbhashlookup(&udbtable, ip->ip_src, uh->uh_sport, ip->ip_dst, uh->uh_dport); if (inp == 0) { ++udpstat.udps_pcbhashmiss; #ifdef INET6 if (ipv6) { inp = in_pcblookup(&udbtable, (struct in_addr *)&(ipv6->ip6_src), uh->uh_sport, (struct in_addr *)&(ipv6->ip6_dst), uh->uh_dport, INPLOOKUP_WILDCARD | INPLOOKUP_IPV6); } else #endif /* INET6 */ inp = in_pcblookup(&udbtable, &ip->ip_src, uh->uh_sport, &ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD); if (inp == 0) { udpstat.udps_noport++; if (m->m_flags & (M_BCAST | M_MCAST)) { udpstat.udps_noportbcast++; goto bad; } #ifdef INET6 if (ipv6) { icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT,0); } else #endif /* INET6 */ { *ip = save_ip; uh->uh_sum = savesum; icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); } return; } } #ifdef IPSEC mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); s = splnet(); if (mtag != NULL) { tdbi = (struct tdb_ident *)(mtag + 1); tdb = gettdb(tdbi->spi, &tdbi->dst, tdbi->proto); } else tdb = NULL; ipsp_spd_lookup(m, srcsa.sa.sa_family, iphlen, &error, IPSP_DIRECTION_IN, tdb, inp); if (error) { splx(s); goto bad; } /* Latch SA only if the socket is connected */ if (inp->inp_tdb_in != tdb && (inp->inp_socket->so_state & SS_ISCONNECTED)) { if (tdb) { tdb_add_inp(tdb, inp, 1); if (inp->inp_ipo == NULL) { inp->inp_ipo = ipsec_add_policy(inp, srcsa.sa.sa_family, IPSP_DIRECTION_OUT); if (inp->inp_ipo == NULL) { splx(s); goto bad; } } if (inp->inp_ipo->ipo_dstid == NULL && tdb->tdb_srcid != NULL) { inp->inp_ipo->ipo_dstid = tdb->tdb_srcid; tdb->tdb_srcid->ref_count++; } if (inp->inp_ipsec_remotecred == NULL && tdb->tdb_remote_cred != NULL) { inp->inp_ipsec_remotecred = tdb->tdb_remote_cred; tdb->tdb_remote_cred->ref_count++; } if (inp->inp_ipsec_remoteauth == NULL && tdb->tdb_remote_auth != NULL) { inp->inp_ipsec_remoteauth = tdb->tdb_remote_auth; tdb->tdb_remote_auth->ref_count++; } } else { /* Just reset */ TAILQ_REMOVE(&inp->inp_tdb_in->tdb_inp_in, inp, inp_tdb_in_next); inp->inp_tdb_in = NULL; } } splx(s); #endif /*IPSEC */ opts = NULL; #ifdef INET6 if (ipv6 && (inp->inp_flags & IN6P_CONTROLOPTS)) ip6_savecontrol(inp, &opts, ipv6, m); #endif /* INET6 */ if (ip && (inp->inp_flags & INP_CONTROLOPTS)) { struct mbuf **mp = &opts; if (inp->inp_flags & INP_RECVDSTADDR) { *mp = udp_saveopt((caddr_t) &ip->ip_dst, sizeof(struct in_addr), IP_RECVDSTADDR); if (*mp) mp = &(*mp)->m_next; } #ifdef notyet /* options were tossed above */ if (inp->inp_flags & INP_RECVOPTS) { *mp = udp_saveopt((caddr_t) opts_deleted_above, sizeof(struct in_addr), IP_RECVOPTS); if (*mp) mp = &(*mp)->m_next; } /* ip_srcroute doesn't do what we want here, need to fix */ if (inp->inp_flags & INP_RECVRETOPTS) { *mp = udp_saveopt((caddr_t) ip_srcroute(), sizeof(struct in_addr), IP_RECVRETOPTS); if (*mp) mp = &(*mp)->m_next; } #endif } iphlen += sizeof(struct udphdr); m_adj(m, iphlen); if (sbappendaddr(&inp->inp_socket->so_rcv, &srcsa.sa, m, opts) == 0) { udpstat.udps_fullsock++; goto bad; } sorwakeup(inp->inp_socket); return; bad: m_freem(m); if (opts) m_freem(opts); } /* * Create a "control" mbuf containing the specified data * with the specified type for presentation with a datagram. */ struct mbuf * udp_saveopt(p, size, type) caddr_t p; register int size; int type; { register struct cmsghdr *cp; struct mbuf *m; if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL) return ((struct mbuf *) NULL); cp = (struct cmsghdr *) mtod(m, struct cmsghdr *); bcopy(p, CMSG_DATA(cp), size); size = CMSG_LEN(size); m->m_len = size; cp->cmsg_len = size; cp->cmsg_level = IPPROTO_IP; cp->cmsg_type = type; return (m); } /* * Notify a udp user of an asynchronous error; * just wake up so that he can collect error status. */ static void udp_notify(inp, errno) register struct inpcb *inp; int errno; { inp->inp_socket->so_error = errno; sorwakeup(inp->inp_socket); sowwakeup(inp->inp_socket); } #ifdef INET6 void udp6_ctlinput(cmd, sa, d) int cmd; struct sockaddr *sa; void *d; { struct udphdr uh; struct sockaddr_in6 sa6; register struct ip6_hdr *ip6; struct mbuf *m; int off; void *cmdarg; struct ip6ctlparam *ip6cp = NULL; struct in6_addr finaldst; struct udp_portonly { u_int16_t uh_sport; u_int16_t uh_dport; } *uhp; void (*notify)(struct inpcb *, int) = udp_notify; if (sa == NULL) return; if (sa->sa_family != AF_INET6 || sa->sa_len != sizeof(struct sockaddr_in6)) return; if ((unsigned)cmd >= PRC_NCMDS) return; if (PRC_IS_REDIRECT(cmd)) notify = in_rtchange, d = NULL; else if (cmd == PRC_HOSTDEAD) d = NULL; else if (cmd == PRC_MSGSIZE) ; /* special code is present, see below */ else if (inet6ctlerrmap[cmd] == 0) return; /* 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; cmdarg = ip6cp->ip6c_cmdarg; } else { m = NULL; ip6 = NULL; cmdarg = NULL; /* XXX: translate addresses into internal form */ sa6 = *(struct sockaddr_in6 *)sa; #ifndef SCOPEDROUTING if (in6_embedscope(&sa6.sin6_addr, &sa6, NULL, NULL)) { /* should be impossible */ return; } #endif } if (ip6cp && ip6cp->ip6c_finaldst) { bzero(&sa6, sizeof(sa6)); sa6.sin6_family = AF_INET6; sa6.sin6_len = sizeof(sa6); sa6.sin6_addr = *ip6cp->ip6c_finaldst; /* XXX: assuming M is valid in this case */ sa6.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, ip6cp->ip6c_finaldst); #ifndef SCOPEDROUTING if (in6_embedscope(ip6cp->ip6c_finaldst, &sa6, NULL, NULL)) { /* should be impossible */ return; } #endif } else { /* XXX: translate addresses into internal form */ sa6 = *(struct sockaddr_in6 *)sa; #ifndef SCOPEDROUTING if (in6_embedscope(&sa6.sin6_addr, &sa6, NULL, NULL)) { /* should be impossible */ return; } #endif } if (ip6) { /* * XXX: We assume that when IPV6 is non NULL, * M and OFF are valid. */ struct sockaddr_in6 sa6_src; /* 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); bzero(&sa6_src, sizeof(sa6_src)); sa6_src.sin6_family = AF_INET6; sa6_src.sin6_len = sizeof(sa6_src); sa6_src.sin6_addr = ip6->ip6_src; sa6_src.sin6_scope_id = in6_addr2scopeid(m->m_pkthdr.rcvif, &ip6->ip6_src); #ifndef SCOPEDROUTING if (in6_embedscope(&sa6_src.sin6_addr, &sa6_src, NULL, NULL)) { /* should be impossible */ return; } #endif if (cmd == PRC_MSGSIZE) { int valid = 0; /* * Check to see if we have a valid UDP socket * corresponding to the address in the ICMPv6 message * payload. */ if (in6_pcbhashlookup(&udbtable, &finaldst, uh.uh_dport, &sa6_src.sin6_addr, uh.uh_sport)) valid = 1; else if (in_pcblookup(&udbtable, &sa6.sin6_addr, uh.uh_dport, &sa6_src.sin6_addr, uh.uh_sport, INPLOOKUP_IPV6)) valid = 1; #if 0 /* * As the use of sendto(2) is fairly popular, * we may want to allow non-connected pcb too. * But it could be too weak against attacks... * We should at least check if the local address (= s) * is really ours. */ else if (in_pcblookup(&udbtable, &sa6.sin6_addr, uh.uh_dport, &sa6_src.sin6_addr, uh.uh_sport, INPLOOKUP_WILDCARD | INPLOOKUP_IPV6)) valid = 1; #endif /* * Depending on the value of "valid" and routing table * size (mtudisc_{hi,lo}wat), we will: * - recalcurate the new MTU and create the * corresponding routing entry, or * - ignore the MTU change notification. */ icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); /* * regardless of if we called icmp6_mtudisc_update(), * we need to call in6_pcbnotify(), to notify path * MTU change to the userland (2292bis-02), because * some unconnected sockets may share the same * destination and want to know the path MTU. */ } (void) in6_pcbnotify(&udbtable, (struct sockaddr *)&sa6, uh.uh_dport, (struct sockaddr *)&sa6_src, uh.uh_sport, cmd, cmdarg, notify); } else { (void) in6_pcbnotify(&udbtable, (struct sockaddr *)&sa6, 0, (struct sockaddr *)&sa6_any, 0, cmd, cmdarg, notify); } } #endif void * udp_ctlinput(cmd, sa, v) int cmd; struct sockaddr *sa; void *v; { register struct ip *ip = v; register struct udphdr *uhp; extern int inetctlerrmap[]; void (*notify)(struct inpcb *, int) = udp_notify; int errno; if (sa == NULL) return NULL; if (sa->sa_family != AF_INET || sa->sa_len != sizeof(struct sockaddr_in)) return NULL; if ((unsigned)cmd >= PRC_NCMDS) return NULL; errno = inetctlerrmap[cmd]; if (PRC_IS_REDIRECT(cmd)) notify = in_rtchange, ip = 0; else if (cmd == PRC_HOSTDEAD) ip = 0; else if (errno == 0) return NULL; if (ip) { uhp = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); in_pcbnotify(&udbtable, sa, uhp->uh_dport, ip->ip_src, uhp->uh_sport, errno, notify); } else in_pcbnotifyall(&udbtable, sa, errno, notify); return NULL; } int udp_output(struct mbuf *m, ...) { register struct inpcb *inp; struct mbuf *addr, *control; register struct udpiphdr *ui; register int len = m->m_pkthdr.len; struct in_addr laddr; int s = 0, error = 0; va_list ap; int pcbflags = 0; va_start(ap, m); inp = va_arg(ap, struct inpcb *); addr = va_arg(ap, struct mbuf *); control = va_arg(ap, struct mbuf *); va_end(ap); #ifdef DIAGNOSTIC if ((inp->inp_flags & INP_IPV6) != 0) panic("IPv6 inpcb to udp_output"); #endif /* * Compute the packet length of the IP header, and * punt if the length looks bogus. */ if ((len + sizeof(struct udpiphdr)) > IP_MAXPACKET) { error = EMSGSIZE; goto release; } if (addr) { /* * Save current PCB flags because they may change during * temporary connection. */ pcbflags = inp->inp_flags; laddr = inp->inp_laddr; if (inp->inp_faddr.s_addr != INADDR_ANY) { error = EISCONN; goto release; } /* * Must block input while temporarily connected. */ s = splsoftnet(); error = in_pcbconnect(inp, addr); if (error) { splx(s); goto release; } } else { if (inp->inp_faddr.s_addr == INADDR_ANY) { error = ENOTCONN; goto release; } } /* * Calculate data length and get a mbuf * for UDP and IP headers. */ M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); if (m == 0) { error = ENOBUFS; goto bail; } /* * Fill in mbuf with extended UDP header * and addresses and length put into network format. */ ui = mtod(m, struct udpiphdr *); bzero(ui->ui_x1, sizeof ui->ui_x1); ui->ui_pr = IPPROTO_UDP; ui->ui_len = htons((u_int16_t)len + sizeof (struct udphdr)); ui->ui_src = inp->inp_laddr; ui->ui_dst = inp->inp_faddr; ui->ui_sport = inp->inp_lport; ui->ui_dport = inp->inp_fport; ui->ui_ulen = ui->ui_len; /* * Compute the pseudo-header checksum; defer further checksumming * until ip_output() or hardware (if it exists). */ if (udpcksum) { m->m_pkthdr.csum |= M_UDPV4_CSUM_OUT; ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, ui->ui_dst.s_addr, htons((u_int16_t)len + sizeof (struct udphdr) + IPPROTO_UDP)); } else ui->ui_sum = 0; ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; udpstat.udps_opackets++; error = ip_output(m, inp->inp_options, &inp->inp_route, inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), inp->inp_moptions, inp, NULL); bail: if (addr) { in_pcbdisconnect(inp); inp->inp_flags = pcbflags; inp->inp_laddr = laddr; splx(s); } if (control) m_freem(control); return (error); release: m_freem(m); if (control) m_freem(control); return (error); } u_int udp_sendspace = 9216; /* really max datagram size */ u_int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); /* 40 1K datagrams */ #ifdef INET6 /*ARGSUSED*/ int udp6_usrreq(so, req, m, addr, control, p) struct socket *so; int req; struct mbuf *m, *addr, *control; struct proc *p; { return udp_usrreq(so, req, m, addr, control); } #endif /*ARGSUSED*/ int udp_usrreq(so, req, m, addr, control) struct socket *so; int req; struct mbuf *m, *addr, *control; { struct inpcb *inp = sotoinpcb(so); int error = 0; int s; if (req == PRU_CONTROL) { #ifdef INET6 if (inp->inp_flags & INP_IPV6) return (in6_control(so, (u_long)m, (caddr_t)addr, (struct ifnet *)control, 0)); else #endif /* INET6 */ return (in_control(so, (u_long)m, (caddr_t)addr, (struct ifnet *)control)); } if (inp == NULL && req != PRU_ATTACH) { error = EINVAL; goto release; } /* * Note: need to block udp_input while changing * the udp pcb queue and/or pcb addresses. */ switch (req) { case PRU_ATTACH: if (inp != NULL) { error = EINVAL; break; } s = splsoftnet(); error = in_pcballoc(so, &udbtable); splx(s); if (error) break; error = soreserve(so, udp_sendspace, udp_recvspace); if (error) break; #ifdef INET6 if (((struct inpcb *)so->so_pcb)->inp_flags & INP_IPV6) ((struct inpcb *) so->so_pcb)->inp_ipv6.ip6_hlim = ip6_defhlim; else #endif /* INET6 */ ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl; break; case PRU_DETACH: udp_detach(inp); break; case PRU_BIND: s = splsoftnet(); #ifdef INET6 if (inp->inp_flags & INP_IPV6) error = in6_pcbbind(inp, addr); else #endif error = in_pcbbind(inp, addr); splx(s); break; case PRU_LISTEN: error = EOPNOTSUPP; break; case PRU_CONNECT: #ifdef INET6 if (inp->inp_flags & INP_IPV6) { if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) { error = EISCONN; break; } s = splsoftnet(); error = in6_pcbconnect(inp, addr); splx(s); } else #endif /* INET6 */ { if (inp->inp_faddr.s_addr != INADDR_ANY) { error = EISCONN; break; } s = splsoftnet(); error = in_pcbconnect(inp, addr); splx(s); } if (error == 0) soisconnected(so); break; case PRU_CONNECT2: error = EOPNOTSUPP; break; case PRU_ACCEPT: error = EOPNOTSUPP; break; case PRU_DISCONNECT: #ifdef INET6 if (inp->inp_flags & INP_IPV6) { if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) { error = ENOTCONN; break; } } else #endif /* INET6 */ { if (inp->inp_faddr.s_addr == INADDR_ANY) { error = ENOTCONN; break; } } s = splsoftnet(); in_pcbdisconnect(inp); #ifdef INET6 if (inp->inp_flags & INP_IPV6) inp->inp_laddr6 = in6addr_any; else #endif /* INET6 */ inp->inp_laddr.s_addr = INADDR_ANY; splx(s); so->so_state &= ~SS_ISCONNECTED; /* XXX */ break; case PRU_SHUTDOWN: socantsendmore(so); break; case PRU_SEND: #ifdef INET6 if (inp->inp_flags & INP_IPV6) return (udp6_output(inp, m, addr, control)); else return (udp_output(m, inp, addr, control)); #else return (udp_output(m, inp, addr, control)); #endif case PRU_ABORT: soisdisconnected(so); udp_detach(inp); break; case PRU_SOCKADDR: #ifdef INET6 if (inp->inp_flags & INP_IPV6) in6_setsockaddr(inp, addr); else #endif /* INET6 */ in_setsockaddr(inp, addr); break; case PRU_PEERADDR: #ifdef INET6 if (inp->inp_flags & INP_IPV6) in6_setpeeraddr(inp, addr); else #endif /* INET6 */ in_setpeeraddr(inp, addr); break; case PRU_SENSE: /* * stat: don't bother with a blocksize. */ /* * Perhaps Path MTU might be returned for a connected * UDP socket in this case. */ return (0); case PRU_SENDOOB: case PRU_FASTTIMO: case PRU_SLOWTIMO: case PRU_PROTORCV: case PRU_PROTOSEND: error = EOPNOTSUPP; break; case PRU_RCVD: case PRU_RCVOOB: return (EOPNOTSUPP); /* do not free mbuf's */ default: panic("udp_usrreq"); } release: if (control) { m_freem(control); } if (m) m_freem(m); return (error); } static void udp_detach(inp) struct inpcb *inp; { int s = splsoftnet(); in_pcbdetach(inp); splx(s); } /* * Sysctl for udp variables. */ int udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen) int *name; u_int namelen; void *oldp; size_t *oldlenp; void *newp; size_t newlen; { /* All sysctl names at this level are terminal. */ if (namelen != 1) return (ENOTDIR); switch (name[0]) { case UDPCTL_CHECKSUM: return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum)); case UDPCTL_BADDYNAMIC: return (sysctl_struct(oldp, oldlenp, newp, newlen, baddynamicports.udp, sizeof(baddynamicports.udp))); case UDPCTL_RECVSPACE: return (sysctl_int(oldp, oldlenp, newp, newlen,&udp_recvspace)); case UDPCTL_SENDSPACE: return (sysctl_int(oldp, oldlenp, newp, newlen,&udp_sendspace)); default: return (ENOPROTOOPT); } /* NOTREACHED */ }