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 1.45 retrieving revision 1.120 diff -u -p -r1.45 -r1.120 --- src/sys/netinet/udp_usrreq.c 1999/01/11 22:35:07 1.45 +++ src/sys/netinet/udp_usrreq.c 2004/05/01 02:20:43 1.120 @@ -1,4 +1,33 @@ -/* $NetBSD: udp_usrreq.c,v 1.45 1999/01/11 22:35:07 thorpej Exp $ */ +/* $NetBSD: udp_usrreq.c,v 1.120 2004/05/01 02:20:43 matt 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 @@ -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. * @@ -34,7 +59,15 @@ * * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 */ -#include "ipkdb.h" + +#include +__KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.120 2004/05/01 02:20:43 matt Exp $"); + +#include "opt_inet.h" +#include "opt_ipsec.h" +#include "opt_inet_csum.h" +#include "opt_ipkdb.h" +#include "opt_mbuftrace.h" #include #include @@ -46,8 +79,7 @@ #include #include #include - -#include +#include #include #include @@ -63,8 +95,42 @@ #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 +#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. @@ -75,105 +141,451 @@ int udpcksum = 1; int udpcksum = 0; /* XXX */ #endif -static void udp_notify __P((struct inpcb *, int)); +struct inpcbtable udbtable; +struct udpstat udpstat; + +#ifdef INET +static void udp4_sendup (struct mbuf *, int, struct sockaddr *, + struct socket *); +static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, + struct mbuf *, int); +#endif +#ifdef INET6 +static void udp6_sendup (struct mbuf *, int, struct sockaddr *, + struct socket *); +static int udp6_realinput (int, struct sockaddr_in6 *, + struct sockaddr_in6 *, struct mbuf *, int); +#endif +#ifdef INET +static void udp_notify (struct inpcb *, 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++ + +EVCNT_ATTACH_STATIC(udp_hwcsum_bad); +EVCNT_ATTACH_STATIC(udp_hwcsum_ok); +EVCNT_ATTACH_STATIC(udp_hwcsum_data); +EVCNT_ATTACH_STATIC(udp_swcsum); + +#else + +#define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ + +#endif /* UDP_CSUM_COUNTERS */ + void -udp_init() +udp_init(void) { in_pcbinit(&udbtable, udbhashsize, udbhashsize); + + MOWNER_ATTACH(&udp_tx_mowner); + MOWNER_ATTACH(&udp_rx_mowner); + MOWNER_ATTACH(&udp_mowner); } +#ifdef INET void -#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; - int len; - struct ip save_ip; - int iphlen; va_list ap; - struct sockaddr_in udpsrc; + struct sockaddr_in src, dst; + struct ip *ip; + struct udphdr *uh; + int iphlen; + int len; + int n; + u_int16_t ip_len; va_start(ap, m); iphlen = va_arg(ap, int); + (void)va_arg(ap, int); /* ignore value, advance ap */ va_end(ap); + MCLAIM(m, &udp_rx_mowner); 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 *); + 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); } + /* - * Save a copy of the IP header in case we want restore it - * for sending an ICMP error message in response. + * Checksum extended UDP header and data. */ - save_ip = *ip; + 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(struct mbuf **mp, int *offp, int 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); + /* + * 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) { - bzero(((struct ipovly *)ip)->ih_x1, - sizeof ((struct ipovly *)ip)->ih_x1); - ((struct ipovly *)ip)->ih_len = uh->uh_ulen; - if ((uh->uh_sum = in_cksum(m, len + sizeof (struct ip))) != 0) { - udpstat.udps_badsum++; - m_freem(m); - return; + 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; + } + +bad: + if (m) + m_freem(m); + return IPPROTO_DONE; +} +#endif + +#ifdef INET +static void +udp4_sendup(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(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 - if (IN_MULTICAST(ip->ip_dst.s_addr) || - in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { - struct inpcb *last; +#ifdef INET +static int +udp4_realinput(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 @@ -191,181 +603,204 @@ udp_input(m, va_alist) */ /* - * 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. */ - 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)); - - iphlen += sizeof(struct udphdr); - m->m_len -= iphlen; - m->m_pkthdr.len -= iphlen; - m->m_data += iphlen; /* * 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) + 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 (!in_nullhost(inp->inp_laddr)) { - if (!in_hosteq(inp->inp_laddr, ip->ip_dst)) + if (!in_hosteq(inp->inp_laddr, *dst4)) continue; } if (!in_nullhost(inp->inp_faddr)) { - if (!in_hosteq(inp->inp_faddr, ip->ip_src) || - inp->inp_fport != uh->uh_sport) + 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 (last->inp_flags & INP_CONTROLOPTS - || last->inp_socket->so_options & - SO_TIMESTAMP) { - ip_savecontrol(last, &opts, - ip, n); - } - if (sbappendaddr( - &last->inp_socket->so_rcv, - sintosa(&udpsrc), 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 + * port. It assumes that an application will never * clear these options after setting them. */ - if ((last->inp_socket->so_options & + if ((inp->inp_socket->so_options & (SO_REUSEPORT|SO_REUSEADDR)) == 0) break; } + } 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; + } + + udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); + rcvcnt++; + } + +bad: + return rcvcnt; +} +#endif + +#ifdef INET6 +static int +udp6_realinput(int af, struct sockaddr_in6 *src, struct sockaddr_in6 *dst, + struct mbuf *m, int off) +{ + 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?) + */ + + /* + * 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++; - if (last == NULL) { /* - * No matching pcb found; discard datagram. - * (No need to send an ICMP Port Unreachable - * for a broadcast or multicast datgram.) + * 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. */ - udpstat.udps_noportbcast++; - goto bad; - } - if (last->inp_flags & INP_CONTROLOPTS || - last->inp_socket->so_options & SO_TIMESTAMP) - ip_savecontrol(last, &opts, ip, m); - if (sbappendaddr(&last->inp_socket->so_rcv, - sintosa(&udpsrc), m, opts) == 0) { - udpstat.udps_fullsock++; - goto bad; + if ((in6p->in6p_socket->so_options & + (SO_REUSEPORT|SO_REUSEADDR)) == 0) + break; } - 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) { - udpstat.udps_noport++; - if (m->m_flags & (M_BCAST | M_MCAST)) { - udpstat.udps_noportbcast++; - goto bad; - } - *ip = save_ip; -#if NIPKDB > 0 - 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 - ip->ip_len += iphlen; - icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); - return; + } 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; } - } - /* - * Construct sockaddr format source address. - * Stuff source address and datagram in user buffer. - */ - 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 (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(&udpsrc), m, - opts) == 0) { - udpstat.udps_fullsock++; - goto bad; + udp6_sendup(m, off, (struct sockaddr *)src, in6p->in6p_socket); + rcvcnt++; } - sorwakeup(inp->inp_socket); - return; + bad: - m_freem(m); - if (opts) - m_freem(opts); + 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; - int errno; +udp_notify(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; -{ - register struct ip *ip = v; - register struct udphdr *uh; - extern int inetctlerrmap[]; - void (*notify) __P((struct inpcb *, int)) = udp_notify; +udp_ctlinput(int cmd, struct sockaddr *sa, void *v) +{ + struct ip *ip = v; + struct udphdr *uh; + void (*notify)(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]; @@ -379,6 +814,8 @@ udp_ctlinput(cmd, sa, v) 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); @@ -386,20 +823,15 @@ udp_ctlinput(cmd, sa, v) } int -#if __STDC__ udp_output(struct mbuf *m, ...) -#else -udp_output(m, va_alist) - struct mbuf *m; - va_dcl -#endif { - 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; + MCLAIM(m, &udp_tx_mowner); va_start(ap, m); inp = va_arg(ap, struct inpcb *); va_end(ap); @@ -418,7 +850,7 @@ 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) { + if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { error = EMSGSIZE; goto release; } @@ -428,30 +860,36 @@ udp_output(m, va_alist) * 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; + 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++; + return (ip_output(m, inp->inp_options, &inp->inp_route, inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), - inp->inp_moptions)); + inp->inp_moptions, inp->inp_socket)); release: m_freem(m); @@ -464,20 +902,24 @@ int udp_recvspace = 40 * (1024 + sizeof( /*ARGSUSED*/ int -udp_usrreq(so, req, m, nam, control, p) - struct socket *so; - int req; - struct mbuf *m, *nam, *control; - struct proc *p; +udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, + struct mbuf *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_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 @@ -500,6 +942,11 @@ udp_usrreq(so, req, m, nam, control, p) error = EISCONN; break; } +#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) @@ -568,11 +1015,8 @@ udp_usrreq(so, req, m, nam, control, p) goto die; } error = in_pcbconnect(inp, nam); - if (error) { - die: - m_freem(m); - break; - } + if (error) + goto die; } else { if ((so->so_state & SS_ISCONNECTED) == 0) { error = ENOTCONN; @@ -580,11 +1024,15 @@ udp_usrreq(so, req, m, nam, control, p) } } 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; @@ -625,30 +1073,42 @@ release: /* * 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 */ +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