/* $OpenBSD: udp_usrreq.c,v 1.331 2025/02/06 13:40:58 mvs 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. 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 #include #include #ifdef IPSEC #include #include #endif #ifdef INET6 #include #include #include #endif /* INET6 */ #include "pf.h" #if NPF > 0 #include #endif #ifdef PIPEX #include #include #endif /* * Locks used to protect data: * a atomic */ /* * UDP protocol implementation. * Per RFC 768, August, 1980. */ int udpcksum = 1; /* [a] */ u_int udp_sendspace = 9216; /* [a] really max datagram size */ u_int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); /* [a] 40 1K datagrams */ const struct pr_usrreqs udp_usrreqs = { .pru_attach = udp_attach, .pru_detach = udp_detach, .pru_bind = udp_bind, .pru_connect = udp_connect, .pru_disconnect = udp_disconnect, .pru_shutdown = udp_shutdown, .pru_send = udp_send, .pru_control = in_control, .pru_sockaddr = in_sockaddr, .pru_peeraddr = in_peeraddr, }; #ifdef INET6 const struct pr_usrreqs udp6_usrreqs = { .pru_attach = udp_attach, .pru_detach = udp_detach, .pru_bind = udp_bind, .pru_connect = udp_connect, .pru_disconnect = udp_disconnect, .pru_shutdown = udp_shutdown, .pru_send = udp_send, .pru_control = in6_control, .pru_sockaddr = in6_sockaddr, .pru_peeraddr = in6_peeraddr, }; #endif const struct sysctl_bounded_args udpctl_vars[] = { { UDPCTL_CHECKSUM, &udpcksum, 0, 1 }, { UDPCTL_RECVSPACE, &udp_recvspace, 0, INT_MAX }, { UDPCTL_SENDSPACE, &udp_sendspace, 0, INT_MAX }, }; struct inpcbtable udbtable; #ifdef INET6 struct inpcbtable udb6table; #endif struct cpumem *udpcounters; void udp_sbappend(struct inpcb *, struct mbuf *, struct ip *, struct ip6_hdr *, int, struct udphdr *, struct sockaddr *, u_int32_t); int udp_output(struct inpcb *, struct mbuf *, struct mbuf *, struct mbuf *); void udp_notify(struct inpcb *, int); int udp_sysctl_locked(int *, u_int, void *, size_t *, void *, size_t); int udp_sysctl_udpstat(void *, size_t *, void *); #ifndef UDB_INITIAL_HASH_SIZE #define UDB_INITIAL_HASH_SIZE 128 #endif void udp_init(void) { udpcounters = counters_alloc(udps_ncounters); in_pcbinit(&udbtable, UDB_INITIAL_HASH_SIZE); #ifdef INET6 in_pcbinit(&udb6table, UDB_INITIAL_HASH_SIZE); #endif } int udp_input(struct mbuf **mp, int *offp, int proto, int af) { struct mbuf *m = *mp; int iphlen = *offp; struct ip *ip = NULL; struct udphdr *uh; struct inpcb *inp = NULL; struct ip save_ip; int len; u_int16_t savesum; union { struct sockaddr sa; struct sockaddr_in sin; #ifdef INET6 struct sockaddr_in6 sin6; #endif /* INET6 */ } srcsa, dstsa; struct ip6_hdr *ip6 = NULL; u_int32_t ipsecflowinfo = 0; udpstat_inc(udps_ipackets); IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); if (!uh) { udpstat_inc(udps_hdrops); return IPPROTO_DONE; } /* Check for illegal destination port 0 */ if (uh->uh_dport == 0) { udpstat_inc(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); switch (af) { case AF_INET: if (m->m_pkthdr.len - iphlen != len) { if (len > (m->m_pkthdr.len - iphlen) || len < sizeof(struct udphdr)) { udpstat_inc(udps_badlen); goto bad; } m_adj(m, len - (m->m_pkthdr.len - iphlen)); } ip = mtod(m, struct ip *); /* * Save a copy of the IP header in case we want restore it * for sending an ICMP error message in response. */ save_ip = *ip; break; #ifdef INET6 case AF_INET6: /* jumbograms */ if (len == 0 && m->m_pkthdr.len - iphlen > 0xffff) len = m->m_pkthdr.len - iphlen; if (len != m->m_pkthdr.len - iphlen) { udpstat_inc(udps_badlen); goto bad; } ip6 = mtod(m, struct ip6_hdr *); break; #endif /* INET6 */ default: unhandled_af(af); } /* * Checksum extended UDP header and data. * from W.R.Stevens: check incoming udp cksums even if * udpcksum is not set. */ savesum = uh->uh_sum; if (uh->uh_sum == 0) { udpstat_inc(udps_nosum); #ifdef INET6 /* * In IPv6, the UDP checksum is ALWAYS used. */ if (ip6) goto bad; #endif /* INET6 */ } else { if ((m->m_pkthdr.csum_flags & M_UDP_CSUM_IN_OK) == 0) { if (m->m_pkthdr.csum_flags & M_UDP_CSUM_IN_BAD) { udpstat_inc(udps_badsum); goto bad; } udpstat_inc(udps_inswcsum); if (ip) uh->uh_sum = in4_cksum(m, IPPROTO_UDP, iphlen, len); #ifdef INET6 else if (ip6) uh->uh_sum = in6_cksum(m, IPPROTO_UDP, iphlen, len); #endif /* INET6 */ if (uh->uh_sum != 0) { udpstat_inc(udps_badsum); goto bad; } } } CLR(m->m_pkthdr.csum_flags, M_UDP_CSUM_OUT); #ifdef IPSEC if (udpencap_enable && udpencap_port && esp_enable && #if NPF > 0 !(m->m_pkthdr.pf.flags & PF_TAG_DIVERTED) && #endif uh->uh_dport == htons(udpencap_port)) { u_int32_t spi; int skip = iphlen + sizeof(struct udphdr); if (m->m_pkthdr.len - skip < sizeof(u_int32_t)) { /* packet too short */ m_freem(m); return IPPROTO_DONE; } m_copydata(m, skip, sizeof(u_int32_t), (caddr_t) &spi); /* * decapsulate if the SPI is not zero, otherwise pass * to userland */ if (spi != 0) { int protoff; if ((m = *mp = m_pullup(m, skip)) == NULL) { udpstat_inc(udps_hdrops); return IPPROTO_DONE; } /* remove the UDP header */ bcopy(mtod(m, u_char *), mtod(m, u_char *) + sizeof(struct udphdr), iphlen); m_adj(m, sizeof(struct udphdr)); skip -= sizeof(struct udphdr); espstat_inc(esps_udpencin); protoff = af == AF_INET ? offsetof(struct ip, ip_p) : offsetof(struct ip6_hdr, ip6_nxt); return ipsec_common_input(mp, skip, protoff, af, IPPROTO_ESP, 1); } } #endif /* IPSEC */ switch (af) { 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) & ip6->ip6_flow; #endif /* KAME hack: recover scopeid */ in6_recoverscope(&srcsa.sin6, &ip6->ip6_src); 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; #if 0 /*XXX inbound flowinfo */ dstsa.sin6.sin6_flowinfo = htonl(0x0fffffff) & ip6->ip6_flow; #endif /* KAME hack: recover scopeid */ in6_recoverscope(&dstsa.sin6, &ip6->ip6_dst); break; #endif /* INET6 */ } if (m->m_flags & (M_BCAST|M_MCAST)) { struct inpcbtable *table; struct inpcb_iterator iter = { .inp_table = NULL }; struct inpcb *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?) */ #ifdef INET6 if (ip6) table = &udb6table; else #endif table = &udbtable; mtx_enter(&table->inpt_mtx); last = inp = NULL; while ((inp = in_pcb_iterator(table, inp, &iter)) != NULL) { if (ip6) KASSERT(ISSET(inp->inp_flags, INP_IPV6)); else KASSERT(!ISSET(inp->inp_flags, INP_IPV6)); if (inp->inp_socket->so_rcv.sb_state & SS_CANTRCVMORE) continue; if (rtable_l2(inp->inp_rtableid) != rtable_l2(m->m_pkthdr.ph_rtableid)) continue; if (inp->inp_lport != uh->uh_dport) continue; #ifdef INET6 if (ip6) { if (inp->inp_ip6_minhlim && inp->inp_ip6_minhlim > ip6->ip6_hlim) continue; if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_laddr6)) if (!IN6_ARE_ADDR_EQUAL( &inp->inp_laddr6, &ip6->ip6_dst)) continue; } else #endif /* INET6 */ { if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) continue; if (inp->inp_laddr.s_addr != INADDR_ANY) { if (inp->inp_laddr.s_addr != ip->ip_dst.s_addr) continue; } } #ifdef INET6 if (ip6) { if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) if (!IN6_ARE_ADDR_EQUAL( &inp->inp_faddr6, &ip6->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; mtx_leave(&table->inpt_mtx); n = m_copym(m, 0, M_COPYALL, M_NOWAIT); if (n != NULL) { udp_sbappend(last, n, ip, ip6, iphlen, uh, &srcsa.sa, 0); } in_pcbunref(last); mtx_enter(&table->inpt_mtx); } last = in_pcbref(inp); /* * 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 ((inp->inp_socket->so_options & (SO_REUSEPORT | SO_REUSEADDR)) == 0) { in_pcb_iterator_abort(table, inp, &iter); break; } } mtx_leave(&table->inpt_mtx); if (last == NULL) { /* * No matching pcb found; discard datagram. * (No need to send an ICMP Port Unreachable * for a broadcast or multicast datgram.) */ udpstat_inc(udps_noportbcast); m_freem(m); return IPPROTO_DONE; } udp_sbappend(last, m, ip, ip6, iphlen, uh, &srcsa.sa, 0); in_pcbunref(last); return IPPROTO_DONE; } /* * Locate pcb for datagram. */ #if NPF > 0 inp = pf_inp_lookup(m); #endif if (inp == NULL) { #ifdef INET6 if (ip6) { inp = in6_pcblookup(&udb6table, &ip6->ip6_src, uh->uh_sport, &ip6->ip6_dst, uh->uh_dport, m->m_pkthdr.ph_rtableid); } else #endif /* INET6 */ { inp = in_pcblookup(&udbtable, ip->ip_src, uh->uh_sport, ip->ip_dst, uh->uh_dport, m->m_pkthdr.ph_rtableid); } } if (inp == NULL) { udpstat_inc(udps_pcbhashmiss); #ifdef INET6 if (ip6) { inp = in6_pcblookup_listen(&udb6table, &ip6->ip6_dst, uh->uh_dport, m, m->m_pkthdr.ph_rtableid); } else #endif /* INET6 */ { inp = in_pcblookup_listen(&udbtable, ip->ip_dst, uh->uh_dport, m, m->m_pkthdr.ph_rtableid); } } #ifdef IPSEC if (ipsec_in_use) { struct m_tag *mtag; struct tdb_ident *tdbi; struct tdb *tdb; int error; mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL); if (mtag != NULL) { tdbi = (struct tdb_ident *)(mtag + 1); tdb = gettdb(tdbi->rdomain, tdbi->spi, &tdbi->dst, tdbi->proto); } else tdb = NULL; error = ipsp_spd_lookup(m, af, iphlen, IPSP_DIRECTION_IN, tdb, inp ? &inp->inp_seclevel : NULL, NULL, NULL); if (error) { udpstat_inc(udps_nosec); tdb_unref(tdb); goto bad; } /* create ipsec options, id is not modified after creation */ if (tdb && tdb->tdb_ids) ipsecflowinfo = tdb->tdb_ids->id_flow; tdb_unref(tdb); } #endif /*IPSEC */ if (inp == NULL) { udpstat_inc(udps_noport); if (m->m_flags & (M_BCAST | M_MCAST)) { udpstat_inc(udps_noportbcast); goto bad; } #ifdef INET6 if (ip6) { uh->uh_sum = savesum; 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 IPPROTO_DONE; } KASSERT(sotoinpcb(inp->inp_socket) == inp); soassertlocked_readonly(inp->inp_socket); #ifdef INET6 if (ip6 && inp->inp_ip6_minhlim && inp->inp_ip6_minhlim > ip6->ip6_hlim) { goto bad; } else #endif if (ip && inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) { goto bad; } #if NPF > 0 if (inp->inp_socket->so_state & SS_ISCONNECTED) pf_inp_link(m, inp); #endif #ifdef PIPEX if (pipex_enable && inp->inp_pipex) { struct pipex_session *session; int off = iphlen + sizeof(struct udphdr); if ((session = pipex_l2tp_lookup_session(m, off, &srcsa.sa)) != NULL) { m = *mp = pipex_l2tp_input(m, off, session, ipsecflowinfo); pipex_rele_session(session); if (m == NULL) { in_pcbunref(inp); return IPPROTO_DONE; } } } #endif udp_sbappend(inp, m, ip, ip6, iphlen, uh, &srcsa.sa, ipsecflowinfo); in_pcbunref(inp); return IPPROTO_DONE; bad: m_freem(m); in_pcbunref(inp); return IPPROTO_DONE; } void udp_sbappend(struct inpcb *inp, struct mbuf *m, struct ip *ip, struct ip6_hdr *ip6, int hlen, struct udphdr *uh, struct sockaddr *srcaddr, u_int32_t ipsecflowinfo) { struct socket *so = inp->inp_socket; struct mbuf *opts = NULL; hlen += sizeof(*uh); if (inp->inp_upcall != NULL) { m = (*inp->inp_upcall)(inp->inp_upcall_arg, m, ip, ip6, uh, hlen); if (m == NULL) return; } #ifdef INET6 if (ip6 && (inp->inp_flags & IN6P_CONTROLOPTS || so->so_options & SO_TIMESTAMP)) ip6_savecontrol(inp, m, &opts); #endif /* INET6 */ if (ip && (inp->inp_flags & INP_CONTROLOPTS || so->so_options & SO_TIMESTAMP)) ip_savecontrol(inp, &opts, ip, m); #ifdef INET6 if (ip6 && (inp->inp_flags & IN6P_RECVDSTPORT)) { struct mbuf **mp = &opts; while (*mp) mp = &(*mp)->m_next; *mp = sbcreatecontrol((caddr_t)&uh->uh_dport, sizeof(u_int16_t), IPV6_RECVDSTPORT, IPPROTO_IPV6); } #endif /* INET6 */ if (ip && (inp->inp_flags & INP_RECVDSTPORT)) { struct mbuf **mp = &opts; while (*mp) mp = &(*mp)->m_next; *mp = sbcreatecontrol((caddr_t)&uh->uh_dport, sizeof(u_int16_t), IP_RECVDSTPORT, IPPROTO_IP); } #ifdef IPSEC if (ipsecflowinfo && (inp->inp_flags & INP_IPSECFLOWINFO)) { struct mbuf **mp = &opts; while (*mp) mp = &(*mp)->m_next; *mp = sbcreatecontrol((caddr_t)&ipsecflowinfo, sizeof(u_int32_t), IP_IPSECFLOWINFO, IPPROTO_IP); } #endif m_adj(m, hlen); mtx_enter(&so->so_rcv.sb_mtx); if (sbappendaddr(so, &so->so_rcv, srcaddr, m, opts) == 0) { mtx_leave(&so->so_rcv.sb_mtx); udpstat_inc(udps_fullsock); m_freem(m); m_freem(opts); return; } mtx_leave(&so->so_rcv.sb_mtx); sorwakeup(so); } /* * Notify a udp user of an asynchronous error; * just wake up so that he can collect error status. */ void udp_notify(struct inpcb *inp, int errno) { inp->inp_socket->so_error = errno; sorwakeup(inp->inp_socket); sowwakeup(inp->inp_socket); } #ifdef INET6 void udp6_ctlinput(int cmd, struct sockaddr *sa, u_int rdomain, void *d) { struct udphdr uh; struct sockaddr_in6 sa6; struct ip6_hdr *ip6; struct mbuf *m; int off; void *cmdarg; struct ip6ctlparam *ip6cp = NULL; struct udp_portonly { u_int16_t uh_sport; u_int16_t uh_dport; } *uhp; struct inpcb *inp; 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 = *satosin6(sa); if (in6_embedscope(&sa6.sin6_addr, &sa6, NULL, NULL)) { /* should be impossible */ return; } } 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.ph_ifidx, ip6cp->ip6c_finaldst); if (in6_embedscope(ip6cp->ip6c_finaldst, &sa6, NULL, NULL)) { /* should be impossible */ return; } } else { /* XXX: translate addresses into internal form */ sa6 = *satosin6(sa); if (in6_embedscope(&sa6.sin6_addr, &sa6, NULL, NULL)) { /* should be impossible */ return; } } 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.ph_ifidx, &ip6->ip6_src); if (in6_embedscope(&sa6_src.sin6_addr, &sa6_src, NULL, NULL)) { /* should be impossible */ return; } if (cmd == PRC_MSGSIZE) { /* * Check to see if we have a valid UDP socket * corresponding to the address in the ICMPv6 message * payload. */ inp = in6_pcblookup(&udb6table, &sa6.sin6_addr, uh.uh_dport, &sa6_src.sin6_addr, uh.uh_sport, rdomain); #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. */ if (inp == NULL) { inp = in6_pcblookup_listen(&udb6table, &sa6_src.sin6_addr, uh.uh_sport, NULL, rdomain)) } #endif /* * Depending on the value of "valid" and routing table * size (mtudisc_{hi,lo}wat), we will: * - recalculate the new MTU and create the * corresponding routing entry, or * - ignore the MTU change notification. */ icmp6_mtudisc_update((struct ip6ctlparam *)d, inp != NULL); in_pcbunref(inp); /* * 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. */ } in6_pcbnotify(&udb6table, &sa6, uh.uh_dport, &sa6_src, uh.uh_sport, rdomain, cmd, cmdarg, notify); } else { in6_pcbnotify(&udb6table, &sa6, 0, &sa6_any, 0, rdomain, cmd, cmdarg, notify); } } #endif void udp_ctlinput(int cmd, struct sockaddr *sa, u_int rdomain, void *v) { struct ip *ip = v; struct udphdr *uhp; struct in_addr faddr; struct inpcb *inp; void (*notify)(struct inpcb *, int) = udp_notify; int errno; if (sa == NULL) return; if (sa->sa_family != AF_INET || sa->sa_len != sizeof(struct sockaddr_in)) return; faddr = satosin(sa)->sin_addr; if (faddr.s_addr == INADDR_ANY) return; if ((unsigned)cmd >= PRC_NCMDS) return; 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; if (ip) { uhp = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); #ifdef IPSEC /* PMTU discovery for udpencap */ if (cmd == PRC_MSGSIZE && ip_mtudisc && udpencap_enable && udpencap_port && uhp->uh_sport == htons(udpencap_port)) { udpencap_ctlinput(cmd, sa, rdomain, v); return; } #endif inp = in_pcblookup(&udbtable, ip->ip_dst, uhp->uh_dport, ip->ip_src, uhp->uh_sport, rdomain); if (inp != NULL) notify(inp, errno); in_pcbunref(inp); } else in_pcbnotifyall(&udbtable, satosin(sa), rdomain, errno, notify); } int udp_output(struct inpcb *inp, struct mbuf *m, struct mbuf *addr, struct mbuf *control) { struct sockaddr_in *sin = NULL; struct udpiphdr *ui; u_int32_t ipsecflowinfo = 0; struct sockaddr_in src_sin; int len = m->m_pkthdr.len; struct in_addr laddr; int error = 0; #ifdef INET6 if (ISSET(inp->inp_flags, INP_IPV6)) return (udp6_output(inp, m, addr, control)); #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; } memset(&src_sin, 0, sizeof(src_sin)); if (control) { u_int clen; struct cmsghdr *cm; caddr_t cmsgs; /* * XXX: Currently, we assume all the optional information is * stored in a single mbuf. */ if (control->m_next) { error = EINVAL; goto release; } clen = control->m_len; cmsgs = mtod(control, caddr_t); do { if (clen < CMSG_LEN(0)) { error = EINVAL; goto release; } cm = (struct cmsghdr *)cmsgs; if (cm->cmsg_len < CMSG_LEN(0) || CMSG_ALIGN(cm->cmsg_len) > clen) { error = EINVAL; goto release; } #ifdef IPSEC if ((inp->inp_flags & INP_IPSECFLOWINFO) != 0 && cm->cmsg_len == CMSG_LEN(sizeof(ipsecflowinfo)) && cm->cmsg_level == IPPROTO_IP && cm->cmsg_type == IP_IPSECFLOWINFO) { ipsecflowinfo = *(u_int32_t *)CMSG_DATA(cm); } else #endif if (cm->cmsg_len == CMSG_LEN(sizeof(struct in_addr)) && cm->cmsg_level == IPPROTO_IP && cm->cmsg_type == IP_SENDSRCADDR) { memcpy(&src_sin.sin_addr, CMSG_DATA(cm), sizeof(struct in_addr)); src_sin.sin_family = AF_INET; src_sin.sin_len = sizeof(src_sin); /* no check on reuse when sin->sin_port == 0 */ if ((error = in_pcbaddrisavail(inp, &src_sin, 0, curproc))) goto release; } clen -= CMSG_ALIGN(cm->cmsg_len); cmsgs += CMSG_ALIGN(cm->cmsg_len); } while (clen); } if (addr) { if ((error = in_nam2sin(addr, &sin))) goto release; if (sin->sin_port == 0) { error = EADDRNOTAVAIL; goto release; } if (inp->inp_faddr.s_addr != INADDR_ANY) { error = EISCONN; goto release; } error = in_pcbselsrc(&laddr, sin, inp); if (error) goto release; if (inp->inp_lport == 0) { error = in_pcbbind(inp, NULL, curproc); if (error) goto release; } if (src_sin.sin_len > 0 && src_sin.sin_addr.s_addr != INADDR_ANY && src_sin.sin_addr.s_addr != inp->inp_laddr.s_addr) { src_sin.sin_port = inp->inp_lport; if (inp->inp_laddr.s_addr != INADDR_ANY && (error = in_pcbaddrisavail(inp, &src_sin, 0, curproc))) goto release; laddr = src_sin.sin_addr; } } else { if (inp->inp_faddr.s_addr == INADDR_ANY) { error = ENOTCONN; goto release; } laddr = inp->inp_laddr; } /* * Calculate data length and get a mbuf * for UDP and IP headers. */ M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); if (m == NULL) { 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 = laddr; ui->ui_dst = sin ? sin->sin_addr : inp->inp_faddr; ui->ui_sport = inp->inp_lport; ui->ui_dport = sin ? sin->sin_port : inp->inp_fport; ui->ui_ulen = ui->ui_len; ((struct ip *)ui)->ip_len = htons(sizeof (struct udpiphdr) + len); ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; if (atomic_load_int(&udpcksum)) m->m_pkthdr.csum_flags |= M_UDP_CSUM_OUT; udpstat_inc(udps_opackets); /* force routing table */ m->m_pkthdr.ph_rtableid = inp->inp_rtableid; #if NPF > 0 if (inp->inp_socket->so_state & SS_ISCONNECTED) pf_mbuf_link_inpcb(m, inp); #endif error = ip_output(m, inp->inp_options, &inp->inp_route, (inp->inp_socket->so_options & SO_BROADCAST), inp->inp_moptions, &inp->inp_seclevel, ipsecflowinfo); bail: m_freem(control); return (error); release: m_freem(m); goto bail; } int udp_attach(struct socket *so, int proto, int wait) { struct inpcbtable *table; int error; if (so->so_pcb != NULL) return EINVAL; if ((error = soreserve(so, atomic_load_int(&udp_sendspace), atomic_load_int(&udp_recvspace)))) return error; #ifdef INET6 if (so->so_proto->pr_domain->dom_family == PF_INET6) table = &udb6table; else #endif table = &udbtable; if ((error = in_pcballoc(so, table, wait))) return error; #ifdef INET6 if (ISSET(sotoinpcb(so)->inp_flags, INP_IPV6)) sotoinpcb(so)->inp_ipv6.ip6_hlim = ip6_defhlim; else #endif sotoinpcb(so)->inp_ip.ip_ttl = ip_defttl; return 0; } int udp_detach(struct socket *so) { struct inpcb *inp; soassertlocked(so); inp = sotoinpcb(so); if (inp == NULL) return (EINVAL); in_pcbdetach(inp); return (0); } int udp_bind(struct socket *so, struct mbuf *addr, struct proc *p) { struct inpcb *inp = sotoinpcb(so); soassertlocked(so); return in_pcbbind(inp, addr, p); } int udp_connect(struct socket *so, struct mbuf *addr) { struct inpcb *inp = sotoinpcb(so); int error; soassertlocked(so); #ifdef INET6 if (ISSET(inp->inp_flags, INP_IPV6)) { if (!IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) return (EISCONN); } else #endif { if (inp->inp_faddr.s_addr != INADDR_ANY) return (EISCONN); } error = in_pcbconnect(inp, addr); if (error) return (error); soisconnected(so); return (0); } int udp_disconnect(struct socket *so) { struct inpcb *inp = sotoinpcb(so); soassertlocked(so); #ifdef INET6 if (ISSET(inp->inp_flags, INP_IPV6)) { if (IN6_IS_ADDR_UNSPECIFIED(&inp->inp_faddr6)) return (ENOTCONN); } else #endif { if (inp->inp_faddr.s_addr == INADDR_ANY) return (ENOTCONN); } in_pcbunset_laddr(inp); in_pcbdisconnect(inp); so->so_state &= ~SS_ISCONNECTED; /* XXX */ return (0); } int udp_shutdown(struct socket *so) { soassertlocked(so); socantsendmore(so); return (0); } int udp_send(struct socket *so, struct mbuf *m, struct mbuf *addr, struct mbuf *control) { struct inpcb *inp = sotoinpcb(so); soassertlocked_readonly(so); if (inp == NULL) { /* PCB could be destroyed, but socket still spliced. */ return (EINVAL); } #ifdef PIPEX if (inp->inp_pipex) { struct pipex_session *session; if (addr != NULL) session = pipex_l2tp_userland_lookup_session(m, mtod(addr, struct sockaddr *)); else #ifdef INET6 if (ISSET(inp->inp_flags, INP_IPV6)) session = pipex_l2tp_userland_lookup_session_ipv6( m, inp->inp_faddr6); else #endif session = pipex_l2tp_userland_lookup_session_ipv4( m, inp->inp_faddr); if (session != NULL) { m = pipex_l2tp_userland_output(m, session); pipex_rele_session(session); if (m == NULL) { m_freem(control); return (ENOMEM); } } } #endif return (udp_output(inp, m, addr, control)); } /* * Sysctl for udp variables. */ int udp_sysctl(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_BADDYNAMIC: case UDPCTL_ROOTONLY: { size_t savelen = *oldlenp; int error; if ((error = sysctl_vslock(oldp, savelen))) return (error); error = udp_sysctl_locked(name, namelen, oldp, oldlenp, newp, newlen); sysctl_vsunlock(oldp, savelen); return (error); } case UDPCTL_STATS: if (newp != NULL) return (EPERM); return (udp_sysctl_udpstat(oldp, oldlenp, newp)); default: return (sysctl_bounded_arr(udpctl_vars, nitems(udpctl_vars), name, namelen, oldp, oldlenp, newp, newlen)); } /* NOTREACHED */ } int udp_sysctl_locked(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp, size_t newlen) { int error = ENOPROTOOPT; switch (name[0]) { case UDPCTL_BADDYNAMIC: NET_LOCK(); error = sysctl_struct(oldp, oldlenp, newp, newlen, baddynamicports.udp, sizeof(baddynamicports.udp)); NET_UNLOCK(); break; case UDPCTL_ROOTONLY: if (newp && securelevel > 0) return (EPERM); NET_LOCK(); error = sysctl_struct(oldp, oldlenp, newp, newlen, rootonlyports.udp, sizeof(rootonlyports.udp)); NET_UNLOCK(); break; } return (error); } int udp_sysctl_udpstat(void *oldp, size_t *oldlenp, void *newp) { uint64_t counters[udps_ncounters]; struct udpstat udpstat; u_long *words = (u_long *)&udpstat; int i; CTASSERT(sizeof(udpstat) == (nitems(counters) * sizeof(u_long))); memset(&udpstat, 0, sizeof udpstat); counters_read(udpcounters, counters, nitems(counters), NULL); for (i = 0; i < nitems(counters); i++) words[i] = (u_long)counters[i]; return (sysctl_rdstruct(oldp, oldlenp, newp, &udpstat, sizeof(udpstat))); }