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 1.17 retrieving revision 1.116.2.3 diff -u -p -r1.17 -r1.116.2.3 --- src/sys/netinet/udp_usrreq.c 1995/06/04 05:07:20 1.17 +++ src/sys/netinet/udp_usrreq.c 2004/05/10 15:00:52 1.116.2.3 @@ -1,7 +1,36 @@ -/* $NetBSD: udp_usrreq.c,v 1.17 1995/06/04 05:07:20 mycroft Exp $ */ +/* $NetBSD: udp_usrreq.c,v 1.116.2.3 2004/05/10 15:00:52 tron 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 @@ -12,11 +41,7 @@ * 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 + * 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. * @@ -32,9 +57,18 @@ * 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 +__KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.116.2.3 2004/05/10 15:00:52 tron Exp $"); + +#include "opt_inet.h" +#include "opt_ipsec.h" +#include "opt_inet_csum.h" +#include "opt_ipkdb.h" +#include "opt_mbuftrace.h" + #include #include #include @@ -43,6 +77,10 @@ #include #include #include +#include +#include +#include +#include #include #include @@ -57,6 +95,43 @@ #include #include +#ifdef INET6 +#include +#include +#include +#include +#include +#endif + +#ifndef INET6 +/* always need ip6.h for IP6_EXTHDR_GET */ +#include +#endif + +#include "faith.h" +#if defined(NFAITH) && NFAITH > 0 +#include +#endif + +#include + +#ifdef FAST_IPSEC +#include +#include /* XXX ipsecstat namespace */ +#ifdef INET6 +#include +#endif +#endif /* FAST_IPSEC*/ + +#ifdef IPSEC +#include +#include +#endif /*IPSEC*/ + +#ifdef IPKDB +#include +#endif + /* * UDP protocol implementation. * Per RFC 768, August, 1980. @@ -67,94 +142,470 @@ int udpcksum = 1; int udpcksum = 0; /* XXX */ #endif -struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; -struct inpcb *udp_last_inpcb = &udb; +struct inpcbtable udbtable; +struct udpstat udpstat; -static void udp_detach __P((struct inpcb *)); +#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 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 +#endif +int udbhashsize = UDBHASHSIZE; + +#ifdef MBUFTRACE +struct mowner udp_mowner = { "udp" }; +struct mowner udp_rx_mowner = { "udp", "rx" }; +struct mowner udp_tx_mowner = { "udp", "tx" }; +#endif + +#ifdef UDP_CSUM_COUNTERS +#include + +struct evcnt udp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "udp", "hwcsum bad"); +struct evcnt udp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "udp", "hwcsum ok"); +struct evcnt udp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "udp", "hwcsum data"); +struct evcnt udp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "udp", "swcsum"); + +#define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ + +#else + +#define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ + +#endif /* UDP_CSUM_COUNTERS */ void udp_init() { - udb.inp_next = udb.inp_prev = &udb; + + in_pcbinit(&udbtable, udbhashsize, udbhashsize); + +#ifdef UDP_CSUM_COUNTERS + evcnt_attach_static(&udp_hwcsum_bad); + evcnt_attach_static(&udp_hwcsum_ok); + evcnt_attach_static(&udp_hwcsum_data); + evcnt_attach_static(&udp_swcsum); +#endif /* UDP_CSUM_COUNTERS */ + + MOWNER_ATTACH(&udp_tx_mowner); + MOWNER_ATTACH(&udp_rx_mowner); + MOWNER_ATTACH(&udp_mowner); } +#ifdef INET void -udp_input(m, iphlen) - register struct mbuf *m; - int iphlen; +#if __STDC__ +udp_input(struct mbuf *m, ...) +#else +udp_input(m, va_alist) + struct mbuf *m; + va_dcl +#endif { - register struct ip *ip; - register struct udphdr *uh; - register struct inpcb *inp; - struct mbuf *opts = 0; + va_list ap; + struct sockaddr_in src, dst; + struct ip *ip; + struct udphdr *uh; + int iphlen; int len; - struct ip save_ip; + int n; + u_int16_t ip_len; - udpstat.udps_ipackets++; + va_start(ap, m); + iphlen = va_arg(ap, int); + (void)va_arg(ap, int); /* ignore value, advance ap */ + va_end(ap); - /* - * 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); - } + MCLAIM(m, &udp_rx_mowner); + udpstat.udps_ipackets++; /* * 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 *); + IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); + if (uh == NULL) { + udpstat.udps_hdrops++; + return; } - uh = (struct udphdr *)((caddr_t)ip + iphlen); + KASSERT(UDP_HDR_ALIGNED_P(uh)); + + /* 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. */ + ip_len = ntohs(ip->ip_len); len = ntohs((u_int16_t)uh->uh_ulen); - if (ip->ip_len != len) { - if (len > ip->ip_len) { + if (ip_len != iphlen + len) { + if (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_len); + } + + /* + * Checksum extended UDP header and data. + */ + if (uh->uh_sum) { + switch (m->m_pkthdr.csum_flags & + ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | + M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { + case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: + UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); + goto badcsum; + + case M_CSUM_UDPv4|M_CSUM_DATA: { + u_int32_t hw_csum = m->m_pkthdr.csum_data; + UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); + if (m->m_pkthdr.csum_flags & M_CSUM_NO_PSEUDOHDR) + hw_csum = in_cksum_phdr(ip->ip_src.s_addr, + ip->ip_dst.s_addr, + htons(hw_csum + len + IPPROTO_UDP)); + if ((hw_csum ^ 0xffff) != 0) + goto badcsum; + break; + } + + case M_CSUM_UDPv4: + /* Checksum was okay. */ + UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); + break; + + default: + /* Need to compute it ourselves. */ + UDP_CSUM_COUNTER_INCR(&udp_swcsum); + if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) + goto badcsum; + break; + } + } + + /* 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); + return; + +badcsum: + m_freem(m); + udpstat.udps_badsum++; +} +#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; + + 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; + IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); + if (uh == NULL) { + ip6stat.ip6s_tooshort++; + return IPPROTO_DONE; + } + KASSERT(UDP_HDR_ALIGNED_P(uh)); + ulen = ntohs((u_short)uh->uh_ulen); /* - * Save a copy of the IP header in case we want restore it - * for sending an ICMP error message in response. + * RFC2675 section 4: jumbograms will have 0 in the UDP header field, + * iff payload length > 0xffff. */ - save_ip = *ip; + 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 (udpcksum && uh->uh_sum) { - ((struct ipovly *)ip)->ih_next = 0; - ((struct ipovly *)ip)->ih_prev = 0; - ((struct ipovly *)ip)->ih_x1 = 0; - ((struct ipovly *)ip)->ih_len = uh->uh_ulen; - if (uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) { - udpstat.udps_badsum++; - m_freem(m); - return; + if (uh->uh_sum == 0) { + udp6stat.udp6s_nosum++; + goto bad; + } + 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; } - if (IN_MULTICAST(ip->ip_dst.s_addr) || - in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { - struct socket *last; +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; + + if (!so) + return; + switch (so->so_proto->pr_domain->dom_family) { + case AF_INET: + inp = sotoinpcb(so); + break; +#ifdef INET6 + case AF_INET6: + break; +#endif + default: + return; + } + +#if defined(IPSEC) || defined(FAST_IPSEC) + /* check AH/ESP integrity. */ + if (so != NULL && ipsec4_in_reject_so(m, so)) { + ipsecstat.in_polvio++; + if ((n = m_copy(m, 0, M_COPYALL)) != NULL) + icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, + 0, 0); + 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); + udpstat.udps_fullsock++; + } 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); + +#if defined(IPSEC) || defined(FAST_IPSEC) + /* check AH/ESP integrity. */ + if (so != NULL && ipsec6_in_reject_so(m, so)) { + ipsec6stat.in_polvio++; + if ((n = m_copy(m, 0, M_COPYALL)) != NULL) + icmp6_error(n, ICMP6_DST_UNREACH, + ICMP6_DST_UNREACH_ADMIN, 0); + 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_hdr *inph; + 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)) { /* * Deliver a multicast or broadcast datagram to *all* sockets * for which the local and remote addresses and ports match @@ -172,245 +623,255 @@ udp_input(m, iphlen) */ /* - * Construct sockaddr format source address. + * KAME note: traditionally we dropped 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().) */ - last = NULL; - for (inp = udb.inp_next; inp != &udb; inp = inp->inp_next) { - if (inp->inp_lport != uh->uh_dport) + CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { + inp = (struct inpcb *)inph; + if (inp->inp_af != AF_INET) + continue; + + if (inp->inp_lport != *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, *dst4)) continue; } - 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) + if (!in_nullhost(inp->inp_faddr)) { + if (!in_hosteq(inp->inp_faddr, *src4) || + inp->inp_fport != *sport) continue; } - if (last != NULL) { - struct mbuf *n; + udp4_sendup(m, off, (struct sockaddr *)src, + inp->inp_socket); + rcvcnt++; - if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { - if (sbappendaddr(&last->so_rcv, - sintosa(&udp_in), n, - (struct mbuf *)0) == 0) { - m_freem(n); - udpstat.udps_fullsock++; - } else - sorwakeup(last); - } - } - last = inp->inp_socket; /* * Don't look for additional matches if this one does * not have either the SO_REUSEPORT or SO_REUSEADDR * socket options set. This heuristic avoids searching * through all pcbs in the common case of a non-shared - * port. It * assumes that an application will never + * port. It assumes that an application will never * clear these options after setting them. */ - if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR) == 0)) + if ((inp->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; - } - if (sbappendaddr(&last->so_rcv, sintosa(&udp_in), m, - (struct mbuf *)0) == 0) { - udpstat.udps_fullsock++; - goto bad; - } - sorwakeup(last); - return; - } - /* - * Locate pcb for datagram. - */ - inp = udp_last_inpcb; - if (inp->inp_lport != uh->uh_dport || - inp->inp_fport != uh->uh_sport || - inp->inp_faddr.s_addr != ip->ip_src.s_addr || - inp->inp_laddr.s_addr != ip->ip_dst.s_addr) { - inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport, - ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD); - if (inp) - udp_last_inpcb = inp; - udpstat.udpps_pcbcachemiss++; - } - if (inp == 0) { - udpstat.udps_noport++; - if (m->m_flags & (M_BCAST | M_MCAST)) { - udpstat.udps_noportbcast++; - goto bad; + } 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) + return rcvcnt; } - *ip = save_ip; - ip->ip_len += iphlen; - icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); - return; - } - /* - * 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 - } - 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) { - udpstat.udps_fullsock++; - goto bad; + udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); + rcvcnt++; } - sorwakeup(inp->inp_socket); - return; + bad: - m_freem(m); - if (opts) - m_freem(opts); + return rcvcnt; } +#endif -/* - * 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; +#ifdef INET6 +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; + const struct in_addr *dst4; + struct inpcb_hdr *inph; + 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; + + in6_embedscope(&src6, src, NULL, NULL); + sport = src->sin6_port; + in6_embedscope(&dst6, dst, NULL, NULL); + dport = dst->sin6_port; + dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; + + if (IN6_IS_ADDR_MULTICAST(&dst6) || + (af == AF_INET && IN_MULTICAST(dst4->s_addr))) { + /* + * 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?) + */ - 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); + /* + * KAME note: traditionally we dropped udpiphdr from mbuf here. + * we need udpiphdr for IPsec processing so we do that later. + */ + /* + * Locate pcb(s) for datagram. + */ + CIRCLEQ_FOREACH(inph, &udbtable.inpt_queue, inph_queue) { + in6p = (struct in6pcb *)inph; + if (in6p->in6p_af != AF_INET6) + continue; + + if (in6p->in6p_lport != dport) + continue; + if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { + if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6)) + continue; + } else { + if (IN6_IS_ADDR_V4MAPPED(&dst6) && + (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) + continue; + } + if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { + if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, + &src6) || in6p->in6p_fport != sport) + continue; + } else { + if (IN6_IS_ADDR_V4MAPPED(&src6) && + (in6p->in6p_flags & IN6P_IPV6_V6ONLY)) + continue; + } + + 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; + } + } else { + /* + * Locate pcb for datagram. + */ + in6p = in6_pcblookup_connect(&udbtable, &src6, sport, + &dst6, dport, 0); + if (in6p == 0) { + ++udpstat.udps_pcbhashmiss; + in6p = in6_pcblookup_bind(&udbtable, &dst6, dport, 0); + if (in6p == 0) + return rcvcnt; + } + + udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); + rcvcnt++; + } + +bad: + return rcvcnt; } +#endif +#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); } -void -udp_ctlinput(cmd, sa, ip) +void * +udp_ctlinput(cmd, sa, v) int cmd; struct sockaddr *sa; - register struct ip *ip; + void *v; { - register struct udphdr *uh; - extern struct in_addr zeroin_addr; - extern u_char inetctlerrmap[]; + struct ip *ip = v; + struct udphdr *uh; + void (*notify) __P((struct inpcb *, int)) = udp_notify; + int errno; - if (!PRC_IS_REDIRECT(cmd) && - ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)) - return; + 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(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport, - cmd, udp_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_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify); + in_pcbnotifyall(&udbtable, satosin(sa)->sin_addr, errno, + notify); + return NULL; } int -udp_output(inp, m, addr, control) - register struct inpcb *inp; - register struct mbuf *m; - struct mbuf *addr, *control; -{ - register struct udpiphdr *ui; - register int len = m->m_pkthdr.len; - struct in_addr laddr; - int s, error = 0; - - if (control) - m_freem(control); /* XXX */ - - if (addr) { - laddr = inp->inp_laddr; - if (inp->inp_faddr.s_addr != INADDR_ANY) { - error = EISCONN; - goto release; - } - /* - * Must block input while temporarily connected. - */ - s = splnet(); - error = in_pcbconnect(inp, addr); - if (error) { - splx(s); - goto release; - } - } else { - if (inp->inp_faddr.s_addr == INADDR_ANY) { - error = ENOTCONN; - goto release; - } - } +#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; + + MCLAIM(m, &udp_tx_mowner); + 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. @@ -422,70 +883,93 @@ udp_output(inp, m, addr, control) } /* + * 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 *); - ui->ui_next = ui->ui_prev = 0; - ui->ui_x1 = 0; 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; + ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); /* - * Stuff checksum and output datagram. + * Set up 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; + /* + * XXX Cache pseudo-header checksum part for + * XXX "connected" UDP sockets. + */ + ui->ui_sum = in_cksum_phdr(ui->ui_src.s_addr, + ui->ui_dst.s_addr, htons((u_int16_t)len + + sizeof(struct udphdr) + IPPROTO_UDP)); + m->m_pkthdr.csum_flags = M_CSUM_UDPv4; + m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); + } else + ui->ui_sum = 0; + ((struct ip *)ui)->ip_len = htons(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++; - error = ip_output(m, inp->inp_options, &inp->inp_route, - inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), - inp->inp_moptions); - if (addr) { - in_pcbdisconnect(inp); - inp->inp_laddr = laddr; - splx(s); - } - return (error); + return (ip_output(m, inp->inp_options, &inp->inp_route, + inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), + inp->inp_moptions, inp->inp_socket)); release: m_freem(m); 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*/ int -udp_usrreq(so, req, m, addr, control) +udp_usrreq(so, req, m, nam, control, p) struct socket *so; int req; - struct mbuf *m, *addr, *control; + struct mbuf *m, *nam, *control; + struct proc *p; { - struct inpcb *inp = sotoinpcb(so); - int error = 0; + struct inpcb *inp; int s; + int error = 0; if (req == PRU_CONTROL) - return (in_control(so, (long)m, (caddr_t)addr, - (struct ifnet *)control)); - if (inp == NULL && req != PRU_ATTACH) { + return (in_control(so, (long)m, (caddr_t)nam, + (struct ifnet *)control, p)); + + if (req == PRU_PURGEIF) { + in_pcbpurgeif0(&udbtable, (struct ifnet *)control); + 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. @@ -493,29 +977,33 @@ udp_usrreq(so, req, m, addr, control) switch (req) { case PRU_ATTACH: - if (inp != NULL) { - error = EINVAL; + if (inp != 0) { + error = EISCONN; break; } - s = splnet(); - error = in_pcballoc(so, &udb); - splx(s); - if (error) - break; - error = soreserve(so, udp_sendspace, udp_recvspace); +#ifdef MBUFTRACE + so->so_mowner = &udp_mowner; + so->so_rcv.sb_mowner = &udp_rx_mowner; + so->so_snd.sb_mowner = &udp_tx_mowner; +#endif + 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; - ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl; + inp = sotoinpcb(so); + inp->inp_ip.ip_ttl = ip_defttl; break; case PRU_DETACH: - udp_detach(inp); + in_pcbdetach(inp); break; case PRU_BIND: - s = splnet(); - error = in_pcbbind(inp, addr); - splx(s); + error = in_pcbbind(inp, nam, p); break; case PRU_LISTEN: @@ -523,121 +1011,143 @@ udp_usrreq(so, req, m, addr, control) break; case PRU_CONNECT: - if (inp->inp_faddr.s_addr != INADDR_ANY) { - error = EISCONN; + error = in_pcbconnect(inp, nam); + if (error) break; - } - s = splnet(); - error = in_pcbconnect(inp, addr); - splx(s); - if (error == 0) - soisconnected(so); + soisconnected(so); break; case PRU_CONNECT2: error = EOPNOTSUPP; break; - case PRU_ACCEPT: - error = EOPNOTSUPP; - break; - case PRU_DISCONNECT: - if (inp->inp_faddr.s_addr == INADDR_ANY) { - error = ENOTCONN; - break; - } - s = splnet(); + /*soisdisconnected(so);*/ + so->so_state &= ~SS_ISCONNECTED; /* XXX */ in_pcbdisconnect(inp); - inp->inp_laddr.s_addr = INADDR_ANY; - splx(s); - so->so_state &= ~SS_ISCONNECTED; /* XXX */ + inp->inp_laddr = zeroin_addr; /* XXX */ + in_pcbstate(inp, INP_BOUND); /* XXX */ break; case PRU_SHUTDOWN: socantsendmore(so); break; - case PRU_SEND: - return (udp_output(inp, m, addr, control)); - - case PRU_ABORT: - soisdisconnected(so); - udp_detach(inp); + case PRU_RCVD: + error = EOPNOTSUPP; break; - case PRU_SOCKADDR: - in_setsockaddr(inp, addr); - break; + case PRU_SEND: + if (control && control->m_len) { + m_freem(control); + m_freem(m); + error = EINVAL; + break; + } + { + struct in_addr laddr; /* XXX */ - case PRU_PEERADDR: - in_setpeeraddr(inp, addr); + 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) + goto die; + } else { + if ((so->so_state & SS_ISCONNECTED) == 0) { + error = ENOTCONN; + goto die; + } + } + error = udp_output(m, inp); + m = NULL; + if (nam) { + in_pcbdisconnect(inp); + inp->inp_laddr = laddr; /* XXX */ + in_pcbstate(inp, INP_BOUND); /* XXX */ + } + die: + if (m) + m_freem(m); + } break; case PRU_SENSE: /* * stat: don't bother with a blocksize. */ + splx(s); return (0); + case PRU_RCVOOB: + error = EOPNOTSUPP; + break; + case PRU_SENDOOB: - case PRU_FASTTIMO: - case PRU_SLOWTIMO: - case PRU_PROTORCV: - case PRU_PROTOSEND: + m_freem(control); + m_freem(m); error = EOPNOTSUPP; break; - case PRU_RCVD: - case PRU_RCVOOB: - return (EOPNOTSUPP); /* do not free mbuf's */ + case PRU_SOCKADDR: + in_setsockaddr(inp, nam); + break; + + case PRU_PEERADDR: + in_setpeeraddr(inp, nam); + break; default: panic("udp_usrreq"); } release: - if (control) { - printf("udp control data unexpectedly retained\n"); - m_freem(control); - } - if (m) - m_freem(m); - return (error); -} - -static void -udp_detach(inp) - struct inpcb *inp; -{ - int s = splnet(); - - if (inp == udp_last_inpcb) - udp_last_inpcb = &udb; - in_pcbdetach(inp); splx(s); + return (error); } /* * Sysctl for udp variables. */ -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)); - default: - return (ENOPROTOOPT); - } - /* NOTREACHED */ +SYSCTL_SETUP(sysctl_net_inet_udp_setup, "sysctl net.inet.udp subtree setup") +{ + + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT, + CTLTYPE_NODE, "net", NULL, + NULL, 0, NULL, 0, + CTL_NET, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT, + CTLTYPE_NODE, "inet", NULL, + NULL, 0, NULL, 0, + CTL_NET, PF_INET, CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT, + CTLTYPE_NODE, "udp", NULL, + NULL, 0, NULL, 0, + CTL_NET, PF_INET, IPPROTO_UDP, CTL_EOL); + + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "checksum", NULL, + NULL, 0, &udpcksum, 0, + CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_CHECKSUM, + CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "sendspace", NULL, + NULL, 0, &udp_sendspace, 0, + CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_SENDSPACE, + CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "recvspace", NULL, + NULL, 0, &udp_recvspace, 0, + CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, + CTL_EOL); } +#endif