/* $NetBSD: udp_usrreq.c,v 1.72 2000/10/17 03:06:44 itojun 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, 1988, 1990, 1993, 1995 * 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. * * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 */ #include "opt_ipsec.h" #include "opt_ipkdb.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 #ifdef INET6 #include #include #include #include #include #endif #ifdef PULLDOWN_TEST #ifndef INET6 /* always need ip6.h for IP6_EXTHDR_GET */ #include #endif #endif #include #ifdef IPSEC #include #include #endif /*IPSEC*/ #ifdef IPKDB #include #endif /* * UDP protocol implementation. * Per RFC 768, August, 1980. */ #ifndef COMPAT_42 int udpcksum = 1; #else int udpcksum = 0; /* XXX */ #endif #ifdef INET static void udp4_sendup __P((struct mbuf *, int, struct sockaddr *, struct socket *)); static int udp4_realinput __P((struct sockaddr_in *, struct sockaddr_in *, struct mbuf *, int)); #endif #ifdef INET6 static void udp6_sendup __P((struct mbuf *, int, struct sockaddr *, struct socket *)); static int in6_mcmatch __P((struct in6pcb *, struct in6_addr *, struct ifnet *)); static int udp6_realinput __P((int, struct sockaddr_in6 *, struct sockaddr_in6 *, struct mbuf *, int)); #endif #ifdef INET static void udp_notify __P((struct inpcb *, int)); #endif #ifndef UDBHASHSIZE #define UDBHASHSIZE 128 #endif int udbhashsize = UDBHASHSIZE; void udp_init() { #ifdef INET in_pcbinit(&udbtable, udbhashsize, udbhashsize); #endif } #ifndef UDP6 #ifdef INET void #if __STDC__ udp_input(struct mbuf *m, ...) #else udp_input(m, va_alist) struct mbuf *m; va_dcl #endif { va_list ap; struct sockaddr_in src, dst; struct ip *ip; struct udphdr *uh; int iphlen, proto; int len; int n; va_start(ap, m); iphlen = va_arg(ap, int); proto = va_arg(ap, int); va_end(ap); udpstat.udps_ipackets++; #ifndef PULLDOWN_TEST /* * 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. */ if (iphlen > sizeof (struct ip)) { ip_stripoptions(m, (struct mbuf *)0); iphlen = sizeof(struct ip); } #else /* * we may enable the above code if we save and pass IPv4 options * to the userland. */ #endif /* * Get IP and UDP header together in first mbuf. */ ip = mtod(m, struct ip *); #ifndef PULLDOWN_TEST if (m->m_len < iphlen + sizeof(struct udphdr)) { if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { udpstat.udps_hdrops++; return; } ip = mtod(m, struct ip *); } uh = (struct udphdr *)((caddr_t)ip + iphlen); #else IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); if (uh == NULL) { udpstat.udps_hdrops++; return; } #endif /* destination port of 0 is illegal, based on RFC768. */ if (uh->uh_dport == 0) 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 (ip->ip_len != iphlen + len) { if (ip->ip_len < iphlen + len || len < sizeof(struct udphdr)) { udpstat.udps_badlen++; goto bad; } m_adj(m, iphlen + len - ip->ip_len); } /* * Checksum extended UDP header and data. */ if (uh->uh_sum) { if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) { udpstat.udps_badsum++; m_freem(m); return; } } /* construct source and dst sockaddrs. */ bzero(&src, sizeof(src)); src.sin_family = AF_INET; src.sin_len = sizeof(struct sockaddr_in); bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr)); src.sin_port = uh->uh_sport; bzero(&dst, sizeof(dst)); dst.sin_family = AF_INET; dst.sin_len = sizeof(struct sockaddr_in); bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr)); dst.sin_port = uh->uh_dport; n = udp4_realinput(&src, &dst, m, iphlen); #ifdef INET6 if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { struct sockaddr_in6 src6, dst6; bzero(&src6, sizeof(src6)); src6.sin6_family = AF_INET6; src6.sin6_len = sizeof(struct sockaddr_in6); src6.sin6_addr.s6_addr[10] = src6.sin6_addr.s6_addr[11] = 0xff; bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], sizeof(ip->ip_src)); src6.sin6_port = uh->uh_sport; bzero(&dst6, sizeof(dst6)); dst6.sin6_family = AF_INET6; dst6.sin6_len = sizeof(struct sockaddr_in6); dst6.sin6_addr.s6_addr[10] = dst6.sin6_addr.s6_addr[11] = 0xff; bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], sizeof(ip->ip_dst)); dst6.sin6_port = uh->uh_dport; n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); } #endif if (n == 0) { if (m->m_flags & (M_BCAST | M_MCAST)) { udpstat.udps_noportbcast++; goto bad; } udpstat.udps_noport++; #ifdef IPKDB if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, m, iphlen + sizeof(struct udphdr), m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { /* * It was a debugger connect packet, * just drop it now */ goto bad; } #endif icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); m = NULL; } bad: if (m) m_freem(m); } #endif #ifdef INET6 int udp6_input(mp, offp, proto) struct mbuf **mp; int *offp, proto; { struct mbuf *m = *mp; int off = *offp; struct sockaddr_in6 src, dst; struct ip6_hdr *ip6; struct udphdr *uh; u_int32_t plen, ulen; #if defined(NFAITH) && 0 < NFAITH if (m->m_pkthdr.rcvif) { if (m->m_pkthdr.rcvif->if_type == IFT_FAITH) { /* send icmp6 host unreach? */ m_freem(m); return IPPROTO_DONE; } } #endif udp6stat.udp6s_ipackets++; #ifndef PULLDOWN_TEST IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); #endif ip6 = mtod(m, struct ip6_hdr *); /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ plen = m->m_pkthdr.len - off; #ifndef PULLDOWN_TEST uh = (struct udphdr *)((caddr_t)ip6 + off); #else IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); if (uh == NULL) { ip6stat.ip6s_tooshort++; return IPPROTO_DONE; } #endif ulen = ntohs((u_short)uh->uh_ulen); /* * RFC2675 section 4: jumbograms will have 0 in the UDP header field, * iff payload length > 0xffff. */ if (ulen == 0 && plen > 0xffff) ulen = plen; if (plen != ulen) { udp6stat.udp6s_badlen++; goto bad; } /* destination port of 0 is illegal, based on RFC768. */ if (uh->uh_dport == 0) goto bad; /* Be proactive about malicious use of IPv4 mapped address */ if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) || IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) { /* XXX stat */ goto bad; } /* * Checksum extended UDP header and data. */ if (uh->uh_sum == 0) udp6stat.udp6s_nosum++; else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { udp6stat.udp6s_badsum++; goto bad; } /* * Construct source and dst sockaddrs. * Note that ifindex (s6_addr16[1]) is already filled. */ bzero(&src, sizeof(src)); src.sin6_family = AF_INET6; src.sin6_len = sizeof(struct sockaddr_in6); /* KAME hack: recover scopeid */ (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif); src.sin6_port = uh->uh_sport; bzero(&dst, sizeof(dst)); dst.sin6_family = AF_INET6; dst.sin6_len = sizeof(struct sockaddr_in6); /* KAME hack: recover scopeid */ (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif); dst.sin6_port = uh->uh_dport; if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { if (m->m_flags & M_MCAST) { udp6stat.udp6s_noportmcast++; goto bad; } udp6stat.udp6s_noport++; icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); m = NULL; } bad: if (m) m_freem(m); return IPPROTO_DONE; } #endif #ifdef INET static void udp4_sendup(m, off, src, so) struct mbuf *m; int off; /* offset of data portion */ struct sockaddr *src; struct socket *so; { struct mbuf *opts = NULL; struct mbuf *n; struct inpcb *inp = NULL; #ifdef INET6 struct in6pcb *in6p = NULL; #endif if (!so) return; switch (so->so_proto->pr_domain->dom_family) { case AF_INET: inp = sotoinpcb(so); break; #ifdef INET6 case AF_INET6: in6p = sotoin6pcb(so); break; #endif default: return; } #ifdef IPSEC /* check AH/ESP integrity. */ if (so != NULL && ipsec4_in_reject_so(m, so)) { ipsecstat.in_polvio++; return; } #endif /*IPSEC*/ if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { if (inp && (inp->inp_flags & INP_CONTROLOPTS || so->so_options & SO_TIMESTAMP)) { struct ip *ip = mtod(n, struct ip *); ip_savecontrol(inp, &opts, ip, n); } m_adj(n, off); if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { m_freem(n); if (opts) m_freem(opts); } else sorwakeup(so); } } #endif #ifdef INET6 static void udp6_sendup(m, off, src, so) struct mbuf *m; int off; /* offset of data portion */ struct sockaddr *src; struct socket *so; { struct mbuf *opts = NULL; struct mbuf *n; struct in6pcb *in6p = NULL; if (!so) return; if (so->so_proto->pr_domain->dom_family != AF_INET6) return; in6p = sotoin6pcb(so); #ifdef IPSEC /* check AH/ESP integrity. */ if (so != NULL && ipsec6_in_reject_so(m, so)) { ipsec6stat.in_polvio++; return; } #endif /*IPSEC*/ if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); ip6_savecontrol(in6p, &opts, ip6, n); } m_adj(n, off); if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { m_freem(n); if (opts) m_freem(opts); udp6stat.udp6s_fullsock++; } else sorwakeup(so); } } #endif #ifdef INET static int udp4_realinput(src, dst, m, off) struct sockaddr_in *src; struct sockaddr_in *dst; struct mbuf *m; int off; /* offset of udphdr */ { u_int16_t *sport, *dport; int rcvcnt; struct in_addr *src4, *dst4; struct inpcb *inp; rcvcnt = 0; off += sizeof(struct udphdr); /* now, offset of payload */ if (src->sin_family != AF_INET || dst->sin_family != AF_INET) goto bad; src4 = &src->sin_addr; sport = &src->sin_port; dst4 = &dst->sin_addr; dport = &dst->sin_port; if (IN_MULTICAST(src4->s_addr) || in_broadcast(*dst4, m->m_pkthdr.rcvif)) { 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?) */ /* * KAME note: usually we drop udpiphdr from mbuf here. * we need udpiphdr for IPsec processing so we do that later. */ /* * Locate pcb(s) for datagram. */ for (inp = udbtable.inpt_queue.cqh_first; inp != (struct inpcb *)&udbtable.inpt_queue; inp = inp->inp_queue.cqe_next) { if (inp->inp_lport != *dport) continue; if (!in_nullhost(inp->inp_laddr)) { if (!in_hosteq(inp->inp_laddr, *dst4)) continue; } if (!in_nullhost(inp->inp_faddr)) { if (!in_hosteq(inp->inp_faddr, *src4) || inp->inp_fport != *sport) continue; } last = inp; udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); rcvcnt++; /* * 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) break; } #if 0 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; } #endif } else { /* * Locate pcb for datagram. */ inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); if (inp == 0) { ++udpstat.udps_pcbhashmiss; inp = in_pcblookup_bind(&udbtable, *dst4, *dport); if (inp == 0) { #if 0 struct mbuf *n; if (m->m_flags & (M_BCAST | M_MCAST)) { udpstat.udps_noportbcast++; goto bad; } udpstat.udps_noport++; #ifdef IPKDB if (checkipkdb(src4, *sport, *dport, m, off, m->m_pkthdr.len - off)) { /* * It was a debugger connect packet, * just drop it now */ goto bad; } #endif if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); } #endif return rcvcnt; } } udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); rcvcnt++; } bad: return rcvcnt; } #endif #ifdef INET6 static int in6_mcmatch(in6p, ia6, ifp) struct in6pcb *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; } static int udp6_realinput(af, src, dst, m, off) int af; /* af on packet */ struct sockaddr_in6 *src; struct sockaddr_in6 *dst; struct mbuf *m; int off; /* offset of udphdr */ { u_int16_t *sport, *dport; int rcvcnt; struct in6_addr *src6, *dst6; struct in_addr *src4; struct in6pcb *in6p; rcvcnt = 0; off += sizeof(struct udphdr); /* now, offset of payload */ if (af != AF_INET && af != AF_INET6) goto bad; if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) goto bad; src6 = &src->sin6_addr; sport = &src->sin6_port; dst6 = &dst->sin6_addr; dport = &dst->sin6_port; src4 = (struct in_addr *)&src->sin6_addr.s6_addr32[12]; if (IN6_IS_ADDR_MULTICAST(dst6) || (af == AF_INET && IN_MULTICAST(src4->s_addr))) { struct in6pcb *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?) */ /* * KAME note: usually we drop udpiphdr from mbuf here. * we need udpiphdr for IPsec processing so we do that later. */ /* * Locate pcb(s) for datagram. */ for (in6p = udb6.in6p_next; in6p != &udb6; in6p = in6p->in6p_next) { if (in6p->in6p_lport != *dport) continue; if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, dst6) && !in6_mcmatch(in6p, dst6, m->m_pkthdr.rcvif)) continue; } #ifndef INET6_BINDV6ONLY else { if (IN6_IS_ADDR_V4MAPPED(dst6) && (in6p->in6p_flags & IN6P_BINDV6ONLY)) continue; } #endif if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, src6) || in6p->in6p_fport != *sport) continue; } #ifndef INET6_BINDV6ONLY else { if (IN6_IS_ADDR_V4MAPPED(src6) && (in6p->in6p_flags & IN6P_BINDV6ONLY)) continue; } #endif last = in6p; udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); rcvcnt++; /* * 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 ((in6p->in6p_socket->so_options & (SO_REUSEPORT|SO_REUSEADDR)) == 0) break; } #if 0 if (last == NULL) { /* * No matching pcb found; discard datagram. * (No need to send an ICMP Port Unreachable * for a broadcast or multicast datgram.) */ switch (af) { case AF_INET: udpstat.udps_noportbcast++; break; case AF_INET6: udp6stat.udp6s_noportmcast++; break; } goto bad; } #endif } else { /* * Locate pcb for datagram. */ in6p = in6_pcblookup_connect(&udb6, src6, *sport, dst6, *dport, 0); if (in6p == 0) { ++udpstat.udps_pcbhashmiss; in6p = in6_pcblookup_bind(&udb6, dst6, *dport, 0); if (in6p == 0) { #if 0 struct mbuf *n; n = m_copy(m, 0, M_COPYALL); switch (af) { case AF_INET: if (m->m_flags & (M_BCAST | M_MCAST)) { udpstat.udps_noportbcast++; goto bad; } udpstat.udps_noport++; if (n != NULL) icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); break; case AF_INET6: if (m->m_flags & M_MCAST) { udp6stat.udp6s_noportmcast++; goto bad; } udp6stat.udp6s_noport++; if (n != NULL) icmp6_error(n, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); break; } #endif return rcvcnt; } } udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); rcvcnt++; } bad: return rcvcnt; } #endif #else /*UDP6*/ void #if __STDC__ udp_input(struct mbuf *m, ...) #else udp_input(m, va_alist) struct mbuf *m; va_dcl #endif { int proto; struct ip *ip; struct udphdr *uh; struct inpcb *inp; struct mbuf *opts = 0; int len; struct ip save_ip; int iphlen; va_list ap; struct sockaddr_in udpsrc; struct sockaddr *sa; va_start(ap, m); iphlen = va_arg(ap, int); proto = va_arg(ap, int); va_end(ap); udpstat.udps_ipackets++; /* * 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. */ if (iphlen > sizeof (struct ip)) { ip_stripoptions(m, (struct mbuf *)0); iphlen = sizeof(struct ip); } /* * Get IP and UDP header together in first mbuf. */ ip = mtod(m, struct ip *); if (m->m_len < iphlen + sizeof(struct udphdr)) { if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { udpstat.udps_hdrops++; return; } ip = mtod(m, struct ip *); } uh = (struct udphdr *)((caddr_t)ip + iphlen); /* destination port of 0 is illegal, based on RFC768. */ if (uh->uh_dport == 0) 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 (ip->ip_len != iphlen + len) { if (ip->ip_len < iphlen + len || len < sizeof(struct udphdr)) { udpstat.udps_badlen++; goto bad; } m_adj(m, iphlen + len - ip->ip_len); } /* * Save a copy of the IP header in case we want restore it * for sending an ICMP error message in response. */ save_ip = *ip; /* * Checksum extended UDP header and data. */ if (uh->uh_sum) { bzero(((struct ipovly *)ip)->ih_x1, sizeof ((struct ipovly *)ip)->ih_x1); ((struct ipovly *)ip)->ih_len = uh->uh_ulen; if (in_cksum(m, len + sizeof (struct ip)) != 0) { udpstat.udps_badsum++; m_freem(m); return; } } /* * Construct sockaddr format source address. */ udpsrc.sin_family = AF_INET; udpsrc.sin_len = sizeof(struct sockaddr_in); udpsrc.sin_addr = ip->ip_src; udpsrc.sin_port = uh->uh_sport; bzero((caddr_t)udpsrc.sin_zero, sizeof(udpsrc.sin_zero)); if (IN_MULTICAST(ip->ip_dst.s_addr) || in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { 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?) */ iphlen += sizeof(struct udphdr); /* * KAME note: usually we drop udpiphdr from mbuf here. * we need udpiphdr for IPsec processing so we do that later. */ /* * 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) { if (inp->inp_lport != uh->uh_dport) continue; if (!in_nullhost(inp->inp_laddr)) { if (!in_hosteq(inp->inp_laddr, ip->ip_dst)) continue; } if (!in_nullhost(inp->inp_faddr)) { if (!in_hosteq(inp->inp_faddr, ip->ip_src) || inp->inp_fport != uh->uh_sport) continue; } if (last != NULL) { struct mbuf *n; #ifdef IPSEC /* check AH/ESP integrity. */ if (last != NULL && ipsec4_in_reject(m, last)) { ipsecstat.in_polvio++; /* do not inject data to pcb */ } else #endif /*IPSEC*/ if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { if (last->inp_flags & INP_CONTROLOPTS || last->inp_socket->so_options & SO_TIMESTAMP) { ip_savecontrol(last, &opts, ip, n); } m_adj(n, iphlen); sa = (struct sockaddr *)&udpsrc; if (sbappendaddr( &last->inp_socket->so_rcv, sa, n, opts) == 0) { m_freem(n); if (opts) m_freem(opts); } else sorwakeup(last->inp_socket); opts = 0; } } last = 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 ((last->inp_socket->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; } #ifdef IPSEC /* check AH/ESP integrity. */ if (last != NULL && ipsec4_in_reject(m, last)) { ipsecstat.in_polvio++; goto bad; } #endif /*IPSEC*/ if (last->inp_flags & INP_CONTROLOPTS || last->inp_socket->so_options & SO_TIMESTAMP) ip_savecontrol(last, &opts, ip, m); m->m_len -= iphlen; m->m_pkthdr.len -= iphlen; m->m_data += iphlen; sa = (struct sockaddr *)&udpsrc; if (sbappendaddr(&last->inp_socket->so_rcv, sa, m, opts) == 0) { udpstat.udps_fullsock++; goto bad; } sorwakeup(last->inp_socket); return; } /* * Locate pcb for datagram. */ inp = in_pcblookup_connect(&udbtable, ip->ip_src, uh->uh_sport, ip->ip_dst, uh->uh_dport); if (inp == 0) { ++udpstat.udps_pcbhashmiss; inp = in_pcblookup_bind(&udbtable, ip->ip_dst, uh->uh_dport); if (inp == 0) { if (m->m_flags & (M_BCAST | M_MCAST)) { udpstat.udps_noportbcast++; goto bad; } udpstat.udps_noport++; *ip = save_ip; #ifdef IPKDB if (checkipkdb(&ip->ip_src, uh->uh_sport, uh->uh_dport, m, iphlen + sizeof(struct udphdr), len - sizeof(struct udphdr))) /* It was a debugger connect packet, just drop it now */ goto bad; #endif icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); return; } } #ifdef IPSEC if (inp != NULL && ipsec4_in_reject(m, inp)) { ipsecstat.in_polvio++; goto bad; } #endif /*IPSEC*/ /* * Stuff source address and datagram in user buffer. */ if (inp->inp_flags & INP_CONTROLOPTS || inp->inp_socket->so_options & SO_TIMESTAMP) ip_savecontrol(inp, &opts, ip, m); iphlen += sizeof(struct udphdr); m->m_len -= iphlen; m->m_pkthdr.len -= iphlen; m->m_data += iphlen; sa = (struct sockaddr *)&udpsrc; if (sbappendaddr(&inp->inp_socket->so_rcv, sa, m, opts) == 0) { udpstat.udps_fullsock++; goto bad; } sorwakeup(inp->inp_socket); return; bad: m_freem(m); if (opts) m_freem(opts); } #endif /*UDP6*/ #ifdef INET /* * Notify a udp user of an asynchronous error; * just wake up so that he can collect error status. */ static void udp_notify(inp, errno) struct inpcb *inp; int errno; { inp->inp_socket->so_error = errno; sorwakeup(inp->inp_socket); sowwakeup(inp->inp_socket); } void * udp_ctlinput(cmd, sa, v) int cmd; struct sockaddr *sa; void *v; { struct ip *ip = v; struct udphdr *uh; void (*notify) __P((struct inpcb *, int)) = udp_notify; int errno; 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) { uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, ip->ip_src, uh->uh_sport, errno, notify); /* XXX mapped address case */ } else in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, notify); return NULL; } int #if __STDC__ udp_output(struct mbuf *m, ...) #else udp_output(m, va_alist) struct mbuf *m; va_dcl #endif { struct inpcb *inp; struct udpiphdr *ui; int len = m->m_pkthdr.len; int error = 0; va_list ap; va_start(ap, m); inp = va_arg(ap, struct inpcb *); va_end(ap); /* * 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 release; } /* * 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; } /* * 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; /* * Stuff checksum and output datagram. */ ui->ui_sum = 0; if (udpcksum) { if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0) ui->ui_sum = 0xffff; } ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len; ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */ ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */ udpstat.udps_opackets++; #ifdef IPSEC ipsec_setsocket(m, inp->inp_socket); #endif /*IPSEC*/ return (ip_output(m, inp->inp_options, &inp->inp_route, inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), inp->inp_moptions)); release: m_freem(m); return (error); } int udp_sendspace = 9216; /* really max datagram size */ int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); /* 40 1K datagrams */ /*ARGSUSED*/ int udp_usrreq(so, req, m, nam, control, p) struct socket *so; int req; struct mbuf *m, *nam, *control; struct proc *p; { struct inpcb *inp; int s; int error = 0; if (req == PRU_CONTROL) return (in_control(so, (long)m, (caddr_t)nam, (struct ifnet *)control, p)); if (req == PRU_PURGEIF) { in_purgeif((struct ifnet *)control); in_pcbpurgeif(&udbtable, (struct ifnet *)control); return (0); } s = splsoftnet(); inp = sotoinpcb(so); #ifdef DIAGNOSTIC if (req != PRU_SEND && req != PRU_SENDOOB && control) panic("udp_usrreq: unexpected control mbuf"); #endif if (inp == 0 && 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 != 0) { error = EISCONN; break; } if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { error = soreserve(so, udp_sendspace, udp_recvspace); if (error) break; } error = in_pcballoc(so, &udbtable); if (error) break; inp = sotoinpcb(so); inp->inp_ip.ip_ttl = ip_defttl; #ifdef IPSEC error = ipsec_init_policy(so, &inp->inp_sp); if (error != 0) { in_pcbdetach(inp); break; } #endif /*IPSEC*/ break; case PRU_DETACH: in_pcbdetach(inp); break; case PRU_BIND: error = in_pcbbind(inp, nam, p); break; case PRU_LISTEN: error = EOPNOTSUPP; break; case PRU_CONNECT: error = in_pcbconnect(inp, nam); if (error) break; soisconnected(so); break; case PRU_CONNECT2: error = EOPNOTSUPP; break; case PRU_DISCONNECT: /*soisdisconnected(so);*/ so->so_state &= ~SS_ISCONNECTED; /* XXX */ in_pcbdisconnect(inp); inp->inp_laddr = zeroin_addr; /* XXX */ in_pcbstate(inp, INP_BOUND); /* XXX */ break; case PRU_SHUTDOWN: socantsendmore(so); break; case PRU_RCVD: error = EOPNOTSUPP; break; case PRU_SEND: if (control && control->m_len) { m_freem(control); m_freem(m); error = EINVAL; break; } { struct in_addr laddr; /* XXX */ if (nam) { laddr = inp->inp_laddr; /* XXX */ if ((so->so_state & SS_ISCONNECTED) != 0) { error = EISCONN; goto die; } error = in_pcbconnect(inp, nam); if (error) { die: m_freem(m); break; } } else { if ((so->so_state & SS_ISCONNECTED) == 0) { error = ENOTCONN; goto die; } } error = udp_output(m, inp); if (nam) { in_pcbdisconnect(inp); inp->inp_laddr = laddr; /* XXX */ in_pcbstate(inp, INP_BOUND); /* XXX */ } } break; case PRU_SENSE: /* * stat: don't bother with a blocksize. */ splx(s); return (0); case PRU_RCVOOB: error = EOPNOTSUPP; break; case PRU_SENDOOB: m_freem(control); m_freem(m); error = EOPNOTSUPP; break; case PRU_SOCKADDR: in_setsockaddr(inp, nam); break; case PRU_PEERADDR: in_setpeeraddr(inp, nam); break; default: panic("udp_usrreq"); } release: splx(s); return (error); } /* * 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_SENDSPACE: return (sysctl_int(oldp, oldlenp, newp, newlen, &udp_sendspace)); case UDPCTL_RECVSPACE: return (sysctl_int(oldp, oldlenp, newp, newlen, &udp_recvspace)); default: return (ENOPROTOOPT); } /* NOTREACHED */ } #endif