Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files. =================================================================== RCS file: /ftp/cvs/cvsroot/src/sys/netinet/udp_usrreq.c,v rcsdiff: /ftp/cvs/cvsroot/src/sys/netinet/udp_usrreq.c,v: warning: Unknown phrases like `commitid ...;' are present. retrieving revision 1.32 retrieving revision 1.76 diff -u -p -r1.32 -r1.76 --- src/sys/netinet/udp_usrreq.c 1996/05/23 17:03:31 1.32 +++ src/sys/netinet/udp_usrreq.c 2001/05/08 10:15:14 1.76 @@ -1,7 +1,36 @@ -/* $NetBSD: udp_usrreq.c,v 1.32 1996/05/23 17:03:31 mycroft Exp $ */ +/* $NetBSD: udp_usrreq.c,v 1.76 2001/05/08 10:15:14 itojun Exp $ */ /* - * Copyright (c) 1982, 1986, 1988, 1990, 1993 + * 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 @@ -32,9 +61,12 @@ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * - * @(#)udp_usrreq.c 8.4 (Berkeley) 1/21/94 + * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 */ +#include "opt_ipsec.h" +#include "opt_ipkdb.h" + #include #include #include @@ -45,8 +77,9 @@ #include #include #include +#include -#include +#include #include #include @@ -62,8 +95,37 @@ #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 "faith.h" +#if defined(NFAITH) && NFAITH > 0 +#include +#endif + #include +#ifdef IPSEC +#include +#include +#endif /*IPSEC*/ + +#ifdef IPKDB +#include +#endif + /* * UDP protocol implementation. * Per RFC 768, August, 1980. @@ -74,10 +136,23 @@ int udpcksum = 1; int udpcksum = 0; /* XXX */ #endif -struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; - +#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)); -static struct mbuf *udp_saveopt __P((caddr_t, int, int)); +#endif #ifndef UDBHASHSIZE #define UDBHASHSIZE 128 @@ -88,9 +163,13 @@ void udp_init() { - in_pcbinit(&udbtable, udbhashsize); +#ifdef INET + in_pcbinit(&udbtable, udbhashsize, udbhashsize); +#endif } +#ifndef UDP6 +#ifdef INET void #if __STDC__ udp_input(struct mbuf *m, ...) @@ -100,17 +179,718 @@ udp_input(m, va_alist) va_dcl #endif { - register struct ip *ip; - register struct udphdr *uh; - register struct inpcb *inp; + 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; + +#ifndef PULLDOWN_TEST + IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); +#endif + ip6 = mtod(m, struct ip6_hdr *); + +#if defined(NFAITH) && 0 < NFAITH + if (faithprefix(&ip6->ip6_dst)) { + /* send icmp6 host unreach? */ + m_freem(m); + return IPPROTO_DONE; + } +#endif + + udp6stat.udp6s_ipackets++; + + /* 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(dst4->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 *dst4; + 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; + dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr32[12]; + + if (IN6_IS_ADDR_MULTICAST(dst6) + || (af == AF_INET && IN_MULTICAST(dst4->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++; @@ -139,18 +919,21 @@ udp_input(m, va_alist) } 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 != len) { - if (len > ip->ip_len) { + if (ip->ip_len != iphlen + len) { + if (ip->ip_len < iphlen + len || len < sizeof(struct udphdr)) { udpstat.udps_badlen++; goto bad; } - m_adj(m, len - ip->ip_len); - /* ip->ip_len = len; */ + m_adj(m, iphlen + len - ip->ip_len); } /* * Save a copy of the IP header in case we want restore it @@ -165,16 +948,25 @@ udp_input(m, va_alist) 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) { + 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 socket *last; + struct inpcb *last; /* * Deliver a multicast or broadcast datagram to *all* sockets * for which the local and remote addresses and ports match @@ -191,13 +983,11 @@ udp_input(m, va_alist) * fixing the interface. Maybe 4.5BSD will remedy this?) */ + iphlen += sizeof(struct udphdr); /* - * Construct sockaddr format source address. + * KAME note: usually we drop udpiphdr from mbuf here. + * we need udpiphdr for IPsec processing so we do that later. */ - udp_in.sin_port = uh->uh_sport; - udp_in.sin_addr = ip->ip_src; - m->m_len -= sizeof (struct udpiphdr); - m->m_data += sizeof (struct udpiphdr); /* * Locate pcb(s) for datagram. * (Algorithm copied from raw_intr().) @@ -208,14 +998,12 @@ udp_input(m, va_alist) inp = inp->inp_queue.cqe_next) { if (inp->inp_lport != uh->uh_dport) continue; - if (inp->inp_laddr.s_addr != INADDR_ANY) { - if (inp->inp_laddr.s_addr != - ip->ip_dst.s_addr) + if (!in_nullhost(inp->inp_laddr)) { + if (!in_hosteq(inp->inp_laddr, ip->ip_dst)) continue; } - if (inp->inp_faddr.s_addr != INADDR_ANY) { - if (inp->inp_faddr.s_addr != - ip->ip_src.s_addr || + if (!in_nullhost(inp->inp_faddr)) { + if (!in_hosteq(inp->inp_faddr, ip->ip_src) || inp->inp_fport != uh->uh_sport) continue; } @@ -223,17 +1011,34 @@ udp_input(m, va_alist) 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 (sbappendaddr(&last->so_rcv, - sintosa(&udp_in), n, - (struct mbuf *)0) == 0) { + 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); - udpstat.udps_fullsock++; + if (opts) + m_freem(opts); } else - sorwakeup(last); + sorwakeup(last->inp_socket); + opts = 0; } } - last = inp->inp_socket; + last = inp; /* * Don't look for additional matches if this one does * not have either the SO_REUSEPORT or SO_REUSEADDR @@ -242,7 +1047,8 @@ udp_input(m, va_alist) * port. It * assumes that an application will never * clear these options after setting them. */ - if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) + if ((last->inp_socket->so_options & + (SO_REUSEPORT|SO_REUSEADDR)) == 0) break; } @@ -255,74 +1061,75 @@ udp_input(m, va_alist) udpstat.udps_noportbcast++; goto bad; } - if (sbappendaddr(&last->so_rcv, sintosa(&udp_in), m, - (struct mbuf *)0) == 0) { +#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); + sorwakeup(last->inp_socket); return; } /* * Locate pcb for datagram. */ - inp = in_pcbhashlookup(&udbtable, ip->ip_src, uh->uh_sport, + 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(&udbtable, ip->ip_src, uh->uh_sport, - ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD); + inp = in_pcblookup_bind(&udbtable, ip->ip_dst, uh->uh_dport); if (inp == 0) { - udpstat.udps_noport++; if (m->m_flags & (M_BCAST | M_MCAST)) { udpstat.udps_noportbcast++; goto bad; } + udpstat.udps_noport++; *ip = save_ip; - ip->ip_len += iphlen; +#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*/ /* - * Construct sockaddr format source address. * Stuff source address and datagram in user buffer. */ - udp_in.sin_port = uh->uh_sport; - udp_in.sin_addr = ip->ip_src; - if (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 - } + 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; - if (sbappendaddr(&inp->inp_socket->so_rcv, sintosa(&udp_in), m, - opts) == 0) { + sa = (struct sockaddr *)&udpsrc; + if (sbappendaddr(&inp->inp_socket->so_rcv, sa, m, opts) == 0) { udpstat.udps_fullsock++; goto bad; } @@ -333,41 +1140,19 @@ bad: if (opts) m_freem(opts); } +#endif /*UDP6*/ -/* - * 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 += sizeof(*cp); - m->m_len = size; - cp->cmsg_len = size; - cp->cmsg_level = IPPROTO_IP; - cp->cmsg_type = type; - return (m); -} - +#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) - register struct inpcb *inp; + struct inpcb *inp; int errno; { + inp->inp_socket->so_error = errno; sorwakeup(inp->inp_socket); sowwakeup(inp->inp_socket); @@ -379,12 +1164,14 @@ udp_ctlinput(cmd, sa, v) struct sockaddr *sa; void *v; { - register struct ip *ip = v; - register struct udphdr *uh; - extern int inetctlerrmap[]; + 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]; @@ -396,10 +1183,13 @@ udp_ctlinput(cmd, sa, v) return NULL; if (ip) { uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); - in_pcbnotify(&udbtable, sa, uh->uh_dport, ip->ip_src, - uh->uh_sport, errno, notify); + 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, sa, errno, notify); + in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, + notify); return NULL; } @@ -412,21 +1202,16 @@ udp_output(m, va_alist) va_dcl #endif { - struct mbuf *control; - register struct inpcb *inp; - register struct udpiphdr *ui; - register int len = m->m_pkthdr.len; + struct inpcb *inp; + struct udpiphdr *ui; + int len = m->m_pkthdr.len; int error = 0; va_list ap; va_start(ap, m); - control = va_arg(ap, struct mbuf *); inp = va_arg(ap, struct inpcb *); va_end(ap); - if (control) - m_freem(control); /* XXX */ - /* * Calculate data length and get a mbuf * for UDP and IP headers. @@ -438,6 +1223,15 @@ udp_output(m, va_alist) } /* + * 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. */ @@ -463,6 +1257,14 @@ udp_output(m, va_alist) ((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 + if (ipsec_setsocket(m, inp->inp_socket) != 0) { + error = ENOBUFS; + goto release; + } +#endif /*IPSEC*/ + return (ip_output(m, inp->inp_options, &inp->inp_route, inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), inp->inp_moptions)); @@ -472,8 +1274,8 @@ release: return (error); } -u_long udp_sendspace = 9216; /* really max datagram size */ -u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); +int udp_sendspace = 9216; /* really max datagram size */ +int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); /* 40 1K datagrams */ /*ARGSUSED*/ @@ -484,14 +1286,20 @@ udp_usrreq(so, req, m, nam, control, p) struct mbuf *m, *nam, *control; struct proc *p; { - register struct inpcb *inp; + struct inpcb *inp; int s; - register int error = 0; + 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 @@ -524,6 +1332,13 @@ udp_usrreq(so, req, m, nam, control, p) 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: @@ -553,7 +1368,8 @@ udp_usrreq(so, req, m, nam, control, p) /*soisdisconnected(so);*/ so->so_state &= ~SS_ISCONNECTED; /* XXX */ in_pcbdisconnect(inp); - inp->inp_laddr.s_addr = INADDR_ANY; /* XXX */ + inp->inp_laddr = zeroin_addr; /* XXX */ + in_pcbstate(inp, INP_BOUND); /* XXX */ break; case PRU_SHUTDOWN: @@ -572,10 +1388,10 @@ udp_usrreq(so, req, m, nam, control, p) break; } { - struct in_addr laddr; + struct in_addr laddr; /* XXX */ if (nam) { - laddr = inp->inp_laddr; + laddr = inp->inp_laddr; /* XXX */ if ((so->so_state & SS_ISCONNECTED) != 0) { error = EISCONN; goto die; @@ -592,10 +1408,11 @@ udp_usrreq(so, req, m, nam, control, p) goto die; } } - error = udp_output(m, control, inp); + error = udp_output(m, inp); if (nam) { in_pcbdisconnect(inp); - inp->inp_laddr = laddr; + inp->inp_laddr = laddr; /* XXX */ + in_pcbstate(inp, INP_BOUND); /* XXX */ } } break; @@ -653,8 +1470,15 @@ udp_sysctl(name, namelen, oldp, oldlenp, 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