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 1.28 retrieving revision 1.190.2.1 diff -u -p -r1.28 -r1.190.2.1 --- src/sys/netinet/udp_usrreq.c 1996/03/16 23:54:03 1.28 +++ src/sys/netinet/udp_usrreq.c 2013/07/17 03:16:31 1.190.2.1 @@ -1,7 +1,36 @@ -/* $NetBSD: udp_usrreq.c,v 1.28 1996/03/16 23:54:03 christos Exp $ */ +/* $NetBSD: udp_usrreq.c,v 1.190.2.1 2013/07/17 03:16:31 rmind 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. * @@ -32,21 +57,32 @@ * 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 */ +/* + * UDP protocol implementation. + * Per RFC 768, August, 1980. + */ + +#include +__KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.190.2.1 2013/07/17 03:16:31 rmind Exp $"); + +#include "opt_inet.h" +#include "opt_compat_netbsd.h" +#include "opt_ipsec.h" +#include "opt_inet_csum.h" +#include "opt_ipkdb.h" +#include "opt_mbuftrace.h" + #include -#include #include #include #include #include -#include -#include #include -#include - -#include +#include +#include #include #include @@ -61,396 +97,682 @@ #include #include #include +#include -#include +#ifdef INET6 +#include +#include +#include +#include +#include +#include +#include +#endif -/* - * UDP protocol implementation. - * Per RFC 768, August, 1980. - */ -#ifndef COMPAT_42 -int udpcksum = 1; -#else -int udpcksum = 0; /* XXX */ +#ifndef INET6 +/* always need ip6.h for IP6_EXTHDR_GET */ +#include +#endif + +#ifdef IPSEC +#include +#include +#include +#include +#ifdef INET6 +#include #endif +#endif /* IPSEC */ -struct sockaddr_in udp_in = { sizeof(udp_in), AF_INET }; +#ifdef COMPAT_50 +#include +#endif -static void udp_detach __P((struct inpcb *)); -static void udp_notify __P((struct inpcb *, int)); -static struct mbuf *udp_saveopt __P((caddr_t, int, int)); +#ifdef IPKDB +#include +#endif + +int udpcksum = 1; +int udp_do_loopback_cksum = 0; + +inpcbtable_t * udbtable __read_mostly; +percpu_t * udpstat_percpu; + +#ifdef INET +#ifdef IPSEC +static int udp4_espinudp (struct mbuf **, int, struct sockaddr *, + struct socket *); +#endif +static void udp4_sendup (struct mbuf *, int, struct sockaddr *, + struct socket *); +static int udp4_realinput (struct sockaddr_in *, struct sockaddr_in *, + struct mbuf **, int); +static int udp4_input_checksum(struct mbuf *, const struct udphdr *, int, int); +#endif #ifndef UDBHASHSIZE #define UDBHASHSIZE 128 #endif int udbhashsize = UDBHASHSIZE; +static int udp_sendspace = 9216; +static int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); + +#ifdef MBUFTRACE +struct mowner udp_mowner = MOWNER_INIT("udp", ""); +struct mowner udp_rx_mowner = MOWNER_INIT("udp", "rx"); +struct mowner udp_tx_mowner = MOWNER_INIT("udp", "tx"); +#endif + +#ifdef UDP_CSUM_COUNTERS +#include + +#if defined(INET) +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"); + +EVCNT_ATTACH_STATIC(udp_hwcsum_bad); +EVCNT_ATTACH_STATIC(udp_hwcsum_ok); +EVCNT_ATTACH_STATIC(udp_hwcsum_data); +EVCNT_ATTACH_STATIC(udp_swcsum); +#endif /* defined(INET) */ + +#define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ +#else +#define UDP_CSUM_COUNTER_INCR(ev) /* nothing */ +#endif /* UDP_CSUM_COUNTERS */ + +static void sysctl_net_inet_udp_setup(struct sysctllog **); + void -udp_init() +udp_init(void) +{ + udbtable = inpcb_init(udbhashsize, udbhashsize, 0); + sysctl_net_inet_udp_setup(NULL); + + MOWNER_ATTACH(&udp_tx_mowner); + MOWNER_ATTACH(&udp_rx_mowner); + MOWNER_ATTACH(&udp_mowner); + +#ifdef INET + udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS); +#endif +} + +/* + * Checksum extended UDP header and data. + */ + +int +udp_input_checksum(int af, struct mbuf *m, const struct udphdr *uh, + int iphlen, int len) { + switch (af) { +#ifdef INET + case AF_INET: + return udp4_input_checksum(m, uh, iphlen, len); +#endif +#ifdef INET6 + case AF_INET6: + return udp6_input_checksum(m, uh, iphlen, len); +#endif + default: + KASSERT(false); + } + return -1; +} + +#ifdef INET + +/* + * Checksum extended UDP header and data. + */ + +static int +udp4_input_checksum(struct mbuf *m, const struct udphdr *uh, + int iphlen, int len) +{ + + /* + * XXX it's better to record and check if this mbuf is + * already checked. + */ + + if (uh->uh_sum == 0) + return 0; + + 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) { + const struct ip *ip = + mtod(m, const struct ip *); + + 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. Maybe skip checksum + * on loopback interfaces. + */ + if (__predict_true(!(m->m_pkthdr.rcvif->if_flags & + IFF_LOOPBACK) || + udp_do_loopback_cksum)) { + UDP_CSUM_COUNTER_INCR(&udp_swcsum); + if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) + goto badcsum; + } + break; + } + + return 0; - in_pcbinit(&udbtable, udbhashsize); +badcsum: + UDP_STATINC(UDP_STAT_BADSUM); + return -1; } 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 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); - 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); - } + MCLAIM(m, &udp_rx_mowner); + UDP_STATINC(UDP_STAT_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) { + UDP_STATINC(UDP_STAT_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) { - udpstat.udps_badlen++; + if (ip_len != iphlen + len) { + if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { + UDP_STATINC(UDP_STAT_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. - */ - save_ip = *ip; /* * Checksum extended UDP header and data. */ - if (udpcksum && 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 (udp4_input_checksum(m, uh, iphlen, len)) + goto badcsum; - if (IN_MULTICAST(ip->ip_dst.s_addr) || - in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) { - struct socket *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?) - */ + /* construct source and dst sockaddrs. */ + sockaddr_in_init(&src, &ip->ip_src, uh->uh_sport); + sockaddr_in_init(&dst, &ip->ip_dst, uh->uh_dport); + if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { + UDP_STATINC(UDP_STAT_HDROPS); + return; + } + if (m == NULL) { /* - * Construct sockaddr format source address. - */ - 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().) + * packet has been processed by ESP stuff - + * e.g. dropped NAT-T-keep-alive-packet ... */ - last = NULL; - for (inp = udbtable.inpt_queue.cqh_first; - inp != (struct inpcb *)&udbtable.inpt_queue; - inp = inp->inp_queue.cqe_next) { - if (inp->inp_lport != uh->uh_dport) - continue; - if (inp->inp_laddr.s_addr != INADDR_ANY) { - if (inp->inp_laddr.s_addr != - ip->ip_dst.s_addr) - 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) - continue; - } + return; + } + ip = mtod(m, struct ip *); +#ifdef INET6 + if (IN_MULTICAST(ip->ip_dst.s_addr) || n == 0) { + struct sockaddr_in6 src6, dst6; + + memset(&src6, 0, 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; + memcpy(&src6.sin6_addr.s6_addr[12], &ip->ip_src, + sizeof(ip->ip_src)); + src6.sin6_port = uh->uh_sport; + memset(&dst6, 0, 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; + memcpy(&dst6.sin6_addr.s6_addr[12], &ip->ip_dst, + sizeof(ip->ip_dst)); + dst6.sin6_port = uh->uh_dport; - if (last != NULL) { - struct mbuf *n; + n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); + } +#endif - 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 - * clear these options after setting them. - */ - if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR)) == 0) - break; + if (n == 0) { + if (m->m_flags & (M_BCAST | M_MCAST)) { + UDP_STATINC(UDP_STAT_NOPORTBCAST); + goto bad; } - - if (last == NULL) { + UDP_STATINC(UDP_STAT_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))) { /* - * No matching pcb found; discard datagram. - * (No need to send an ICMP Port Unreachable - * for a broadcast or multicast datgram.) + * It was a debugger connect packet, + * just drop it now */ - 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); +#endif + icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); + m = NULL; + } + +bad: + if (m) + m_freem(m); + return; + +badcsum: + m_freem(m); +} + +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; + inpcb_t *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) + /* check AH/ESP integrity. */ + if (so != NULL && ipsec4_in_reject_so(m, so)) { + IPSEC_STATINC(IPSEC_STAT_IN_POLVIO); + if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) + icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, + 0, 0); + return; + } +#endif /*IPSEC*/ + + if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { + if (inp && ((inpcb_get_flags(inp) & INP_CONTROLOPTS) != 0 +#ifdef SO_OTIMESTAMP + || so->so_options & SO_OTIMESTAMP +#endif + || 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); + so->so_rcv.sb_overflowed++; + UDP_STATINC(UDP_STAT_FULLSOCK); + } else + sorwakeup(so); + } +} + +struct udp_pcb_ctx { + struct mbuf * mbuf; + struct sockaddr_in * src; + struct sockaddr_in * dst; + int off; + int rcvcnt; +}; + +static int +udp4_pcb_process(inpcb_t *inp, void *arg) +{ + struct udp_pcb_ctx *uctx = arg; + struct in_addr dst4 = uctx->dst->sin_addr; + in_port_t dport = uctx->dst->sin_port; + struct in_addr laddr, faddr; + in_port_t lport, fport; + struct socket *so; + + inpcb_get_ports(inp, &lport, &fport); + if (lport != dport) { + return 0; + } + inpcb_get_addrs(inp, &laddr, &faddr); + if (!in_nullhost(laddr) && !in_hosteq(laddr, dst4)) { + return 0; + } + if (!in_nullhost(faddr)) { + struct in_addr src4 = uctx->src->sin_addr; + in_port_t sport = uctx->src->sin_port; + + if (!in_hosteq(faddr, src4) || fport != sport) { + return 0; + } } + + so = inpcb_get_socket(inp); + udp4_sendup(uctx->mbuf, uctx->off, (struct sockaddr *)uctx->src, so); + uctx->rcvcnt++; + /* - * Locate pcb for datagram. + * Do not 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. */ - inp = in_pcbhashlookup(&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); - if (inp == 0) { - udpstat.udps_noport++; - if (m->m_flags & (M_BCAST | M_MCAST)) { - udpstat.udps_noportbcast++; + if ((so->so_options & (SO_REUSEPORT|SO_REUSEADDR)) == 0) { + return EJUSTRETURN; + } + return 0; +} + +static int +udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, + struct mbuf **mp, int off /* offset of udphdr */) +{ + in_port_t *sport, *dport; + struct in_addr *src4, *dst4; + inpcb_t *inp; + struct mbuf *m = *mp; + int rcvcnt; + + 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 udp_pcb_ctx uctx = { + .mbuf = m, .src = src, .dst = dst, + .off = off, .rcvcnt = 0 + }; + int error; + + /* + * 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. + */ + error = inpcb_foreach(udbtable, AF_INET, + udp4_pcb_process, &uctx); + KASSERT(error == 0 || error == EJUSTRETURN); + rcvcnt = uctx.rcvcnt; + } else { + /* + * Locate PCB for datagram. + */ + struct socket *so; + + inp = inpcb_lookup_connect(udbtable, *src4, *sport, *dst4, + *dport, 0); + if (inp == NULL) { + UDP_STATINC(UDP_STAT_PCBHASHMISS); + inp = inpcb_lookup_bind(udbtable, *dst4, *dport); + if (inp == NULL) + return rcvcnt; + } + so = inpcb_get_socket(inp); + +#ifdef IPSEC + /* Handle ESP over UDP */ + if (inpcb_get_flags(inp) & INP_ESPINUDP_ALL) { + struct sockaddr *sa = (struct sockaddr *)src; + + switch (udp4_espinudp(mp, off, sa, so)) { + case -1: /* Error, m was freeed */ + rcvcnt = -1; + goto bad; + break; + + case 1: /* ESP over UDP */ + rcvcnt++; goto bad; + break; + + case 0: /* plain UDP */ + default: /* Unexpected */ + /* + * Normal UDP processing will take place + * m may have changed. + */ + m = *mp; + break; } - *ip = save_ip; - ip->ip_len += iphlen; - icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); - return; } - } +#endif - /* - * 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; + /* + * Check the minimum TTL for socket. + */ + if (mtod(m, struct ip *)->ip_ttl < inpcb_get_minttl(inp)) { + goto bad; } -#endif + udp4_sendup(m, off, (struct sockaddr *)src, so); + rcvcnt++; } - 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; - } - sorwakeup(inp->inp_socket); - return; -bad: - m_freem(m); - if (opts) - m_freem(opts); -} -/* - * 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); +bad: + return rcvcnt; } +#endif +#ifdef INET /* - * Notify a udp user of an asynchronous error; + * 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(inpcb_t *inp, int errno) { - inp->inp_socket->so_error = errno; - sorwakeup(inp->inp_socket); - sowwakeup(inp->inp_socket); + struct socket *so = inpcb_get_socket(inp); + + so->so_error = errno; + sorwakeup(so); + sowwakeup(so); } 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, const struct sockaddr *sa, void *v) +{ + struct ip *ip = v; + struct udphdr *uh; int errno; + bool rdr; + 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) + + rdr = PRC_IS_REDIRECT(cmd); + if (rdr || cmd == PRC_HOSTDEAD || ip == NULL) { + inpcb_notifyall(udbtable, satocsin(sa)->sin_addr, + errno, rdr ? inpcb_rtchange : udp_notify); 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); - } else - in_pcbnotifyall(&udbtable, sa, errno, notify); + } else if (errno == 0) { + return NULL; + } + + /* Note: mapped address case */ + uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2)); + inpcb_notify(udbtable, satocsin(sa)->sin_addr, uh->uh_dport, + ip->ip_src, uh->uh_sport, errno, udp_notify); return NULL; } int -#if __STDC__ -udp_output(struct mbuf *m, ...) -#else -udp_output(m, va_alist) - struct mbuf *m; - va_dcl +udp_ctloutput(int op, struct socket *so, struct sockopt *sopt) +{ + int s, family, optval, inpflags, error = 0; + inpcb_t *inp; + + family = so->so_proto->pr_domain->dom_family; + + s = splsoftnet(); + switch (family) { +#ifdef INET + case PF_INET: + if (sopt->sopt_level != IPPROTO_UDP) { + error = ip_ctloutput(op, so, sopt); + goto end; + } + break; #endif +#ifdef INET6 + case PF_INET6: + if (sopt->sopt_level != IPPROTO_UDP) { + error = ip6_ctloutput(op, so, sopt); + goto end; + } + break; +#endif + default: + error = EAFNOSUPPORT; + goto end; + } + + switch (op) { + case PRCO_SETOPT: + inp = sotoinpcb(so); + + switch (sopt->sopt_name) { + case UDP_ENCAP: + error = sockopt_getint(sopt, &optval); + if (error) + break; + + inpflags = inpcb_get_flags(inp); + switch(optval) { + case 0: + inpflags &= ~INP_ESPINUDP_ALL; + break; + + case UDP_ENCAP_ESPINUDP: + inpflags &= ~INP_ESPINUDP_ALL; + inpflags |= INP_ESPINUDP; + break; + + case UDP_ENCAP_ESPINUDP_NON_IKE: + inpflags &= ~INP_ESPINUDP_ALL; + inpflags |= INP_ESPINUDP_NON_IKE; + break; + default: + error = EINVAL; + break; + } + inpcb_set_flags(inp, inpflags); + break; + + default: + error = ENOPROTOOPT; + break; + } + break; + + default: + error = EINVAL; + break; + } + +end: + splx(s); + return error; +} + + +int +udp_output(struct mbuf *m, ...) { - register struct inpcb *inp; - struct mbuf *addr, *control; - register struct udpiphdr *ui; - register int len = m->m_pkthdr.len; - struct in_addr laddr; - int s = 0, error = 0; + inpcb_t *inp; + struct socket *so; + struct udpiphdr *ui; + struct route *ro; + 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 *); - addr = va_arg(ap, struct mbuf *); - control = va_arg(ap, struct mbuf *); + inp = va_arg(ap, inpcb_t *); va_end(ap); - if (control) - m_freem(control); /* XXX */ + so = inpcb_get_socket(inp); + KASSERT(solocked(so)); - 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 = splsoftnet(); - error = in_pcbconnect(inp, addr); - if (error) { - splx(s); - goto release; - } - } else { - if (inp->inp_faddr.s_addr == INADDR_ANY) { - error = ENOTCONN; - goto release; - } - } /* * Calculate data length and get a mbuf * for UDP and IP headers. @@ -462,99 +784,125 @@ 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. */ 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; + + inpcb_get_addrs(inp, &ui->ui_src, &ui->ui_dst); + inpcb_get_ports(inp, &ui->ui_sport, &ui->ui_dport); + ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); + + ro = inpcb_get_route(inp); /* - * 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; - ((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); + /* + * 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 *inp_ip = in_getiphdr(inp); + ((struct ip *)ui)->ip_ttl = inp_ip->ip_ttl; /* XXX */ + ((struct ip *)ui)->ip_tos = inp_ip->ip_tos; /* XXX */ + UDP_STATINC(UDP_STAT_OPACKETS); + + return (ip_output(m, inpcb_get_options(inp), ro, + so->so_options & (SO_DONTROUTE | SO_BROADCAST), + inpcb_get_moptions(inp), so)); release: m_freem(m); - return (error); + return error; } -u_long udp_sendspace = 9216; /* really max datagram size */ -u_long udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); - /* 40 1K datagrams */ - -/*ARGSUSED*/ int -udp_usrreq(so, req, m, addr, control) - struct socket *so; - int req; - struct mbuf *m, *addr, *control; +udp_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *nam, + struct mbuf *control, struct lwp *l) { - struct inpcb *inp = sotoinpcb(so); - int error = 0; - int s; + inpcb_t *inp; + struct ip *inp_ip; + int s, error = 0; - if (req == PRU_CONTROL) - return (in_control(so, (long)m, (caddr_t)addr, - (struct ifnet *)control)); + if (req == PRU_CONTROL) { + return in_control(so, (long)m, nam, (ifnet_t *)control, l); + } + s = splsoftnet(); + if (req == PRU_PURGEIF) { + mutex_enter(softnet_lock); + inpcb_purgeif0(udbtable, (ifnet_t *)control); + in_purgeif((ifnet_t *)control); + inpcb_purgeif(udbtable, (ifnet_t *)control); + mutex_exit(softnet_lock); + splx(s); + return (0); + } + + KASSERT(req == PRU_ATTACH || solocked(so)); + inp = sotoinpcb(so); + + KASSERT(!control || (req == PRU_SEND || req == PRU_SENDOOB)); if (inp == NULL && req != PRU_ATTACH) { error = EINVAL; goto release; } + /* * Note: need to block udp_input while changing * the udp pcb queue and/or pcb addresses. */ switch (req) { - case PRU_ATTACH: - if (inp != NULL) { - error = EINVAL; + sosetlock(so); + if (inp) { + error = EISCONN; break; } - s = splsoftnet(); - error = in_pcballoc(so, &udbtable); - 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 = inpcb_create(so, udbtable); if (error) break; - ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl; + inp = sotoinpcb(so); + inp_ip = in_getiphdr(inp); + inp_ip->ip_ttl = ip_defttl; break; case PRU_DETACH: - udp_detach(inp); + inpcb_destroy(inp); break; case PRU_BIND: - s = splsoftnet(); - error = in_pcbbind(inp, addr); - splx(s); + error = inpcb_bind(inp, nam, l); break; case PRU_LISTEN: @@ -562,120 +910,327 @@ udp_usrreq(so, req, m, addr, control) break; case PRU_CONNECT: - if (inp->inp_faddr.s_addr != INADDR_ANY) { - error = EISCONN; + error = inpcb_connect(inp, nam, l); + if (error) break; - } - s = splsoftnet(); - 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 = splsoftnet(); - in_pcbdisconnect(inp); - inp->inp_laddr.s_addr = INADDR_ANY; - splx(s); + /*soisdisconnected(so);*/ so->so_state &= ~SS_ISCONNECTED; /* XXX */ + inpcb_disconnect(inp); + inpcb_set_addrs(inp, &zeroin_addr, NULL); /* XXX */ + inpcb_set_state(inp, INP_BOUND); /* XXX */ break; case PRU_SHUTDOWN: socantsendmore(so); break; - case PRU_SEND: - return (udp_output(m, inp, 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; + } + { + /* + * Note: sendto case - temporarily connect the socket + * to the destination, send and then disconnect. + * XXX: save the local address, restore after. + */ + struct in_addr laddr; - case PRU_PEERADDR: - in_setpeeraddr(inp, addr); + memset(&laddr, 0, sizeof laddr); + if (nam) { + inpcb_get_addrs(inp, &laddr, NULL); + if ((so->so_state & SS_ISCONNECTED) != 0) { + error = EISCONN; + goto die; + } + error = inpcb_connect(inp, nam, l); + 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) { + inpcb_disconnect(inp); + inpcb_set_addrs(inp, &laddr, NULL); + inpcb_set_state(inp, INP_BOUND); + } +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: + inpcb_fetch_sockaddr(inp, nam); + break; + + case PRU_PEERADDR: + inpcb_fetch_peeraddr(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); + splx(s); return (error); } -static void -udp_detach(inp) - struct inpcb *inp; +static int +sysctl_net_inet_udp_stats(SYSCTLFN_ARGS) { - int s = splsoftnet(); - in_pcbdetach(inp); - splx(s); + return (NETSTAT_SYSCTL(udpstat_percpu, UDP_NSTATS)); } /* * 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)); - default: - return (ENOPROTOOPT); +static void +sysctl_net_inet_udp_setup(struct sysctllog **clog) +{ + 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", + SYSCTL_DESCR("UDPv4 related settings"), + 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", + SYSCTL_DESCR("Compute UDP checksums"), + 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", + SYSCTL_DESCR("Default UDP send buffer size"), + 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", + SYSCTL_DESCR("Default UDP receive buffer size"), + NULL, 0, &udp_recvspace, 0, + CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_RECVSPACE, + CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT|CTLFLAG_READWRITE, + CTLTYPE_INT, "do_loopback_cksum", + SYSCTL_DESCR("Perform UDP checksum on loopback"), + NULL, 0, &udp_do_loopback_cksum, 0, + CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_LOOPBACKCKSUM, + CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT, + CTLTYPE_STRUCT, "pcblist", + SYSCTL_DESCR("UDP protocol control block list"), + sysctl_inpcblist, 0, udbtable, 0, + CTL_NET, PF_INET, IPPROTO_UDP, CTL_CREATE, + CTL_EOL); + sysctl_createv(clog, 0, NULL, NULL, + CTLFLAG_PERMANENT, + CTLTYPE_STRUCT, "stats", + SYSCTL_DESCR("UDP statistics"), + sysctl_net_inet_udp_stats, 0, NULL, 0, + CTL_NET, PF_INET, IPPROTO_UDP, UDPCTL_STATS, + CTL_EOL); +} +#endif + +void +udp_statinc(u_int stat) +{ + + KASSERT(stat < UDP_NSTATS); + UDP_STATINC(stat); +} + +#if defined(INET) && defined(IPSEC) +/* + * Returns: + * 1 if the packet was processed + * 0 if normal UDP processing should take place + * -1 if an error occurent and m was freed + */ +static int +udp4_espinudp(struct mbuf **mp, int off, struct sockaddr *src, + struct socket *so) +{ + size_t len; + void *data; + inpcb_t *inp; + size_t skip = 0; + size_t minlen; + size_t iphdrlen; + struct ip *ip; + struct m_tag *tag; + struct udphdr *udphdr; + in_port_t sport, dport; + struct mbuf *m = *mp; + int inpflags; + + /* + * Collapse the mbuf chain if the first mbuf is too short + * The longest case is: UDP + non ESP marker + ESP + */ + minlen = off + sizeof(u_int64_t) + sizeof(struct esp); + if (minlen > m->m_pkthdr.len) + minlen = m->m_pkthdr.len; + + if (m->m_len < minlen) { + if ((*mp = m_pullup(m, minlen)) == NULL) { + printf("udp4_espinudp: m_pullup failed\n"); + return -1; + } + m = *mp; + } + + len = m->m_len - off; + data = mtod(m, char *) + off; + inp = sotoinpcb(so); + + /* Ignore keepalive packets */ + if ((len == 1) && (*(unsigned char *)data == 0xff)) { + m_free(m); + *mp = NULL; /* avoid any further processiong by caller ... */ + return 1; + } + inpflags = inpcb_get_flags(inp); + + /* + * Check that the payload is long enough to hold + * an ESP header and compute the length of encapsulation + * header to remove + */ + if (inpflags & INP_ESPINUDP) { + u_int32_t *st = (u_int32_t *)data; + + if ((len <= sizeof(struct esp)) || (*st == 0)) + return 0; /* Normal UDP processing */ + + skip = sizeof(struct udphdr); + } + + if (inpflags & INP_ESPINUDP_NON_IKE) { + u_int32_t *st = (u_int32_t *)data; + + if ((len <= sizeof(u_int64_t) + sizeof(struct esp)) + || ((st[0] | st[1]) != 0)) + return 0; /* Normal UDP processing */ + + skip = sizeof(struct udphdr) + sizeof(u_int64_t); + } + + /* + * Get the UDP ports. They are handled in network + * order everywhere in IPSEC_NAT_T code. + */ + udphdr = (struct udphdr *)((char *)data - skip); + sport = udphdr->uh_sport; + dport = udphdr->uh_dport; + + /* + * Remove the UDP header (and possibly the non ESP marker) + * IP header lendth is iphdrlen + * Before: + * <--- off ---> + * +----+------+-----+ + * | IP | UDP | ESP | + * +----+------+-----+ + * <-skip-> + * After: + * +----+-----+ + * | IP | ESP | + * +----+-----+ + * <-skip-> + */ + iphdrlen = off - sizeof(struct udphdr); + memmove(mtod(m, char *) + skip, mtod(m, void *), iphdrlen); + m_adj(m, skip); + + ip = mtod(m, struct ip *); + ip->ip_len = htons(ntohs(ip->ip_len) - skip); + ip->ip_p = IPPROTO_ESP; + + /* + * We have modified the packet - it is now ESP, so we should not + * return to UDP processing ... + * + * Add a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember + * the source UDP port. This is required if we want + * to select the right SPD for multiple hosts behind + * same NAT + */ + if ((tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, + sizeof(sport) + sizeof(dport), M_DONTWAIT)) == NULL) { + printf("udp4_espinudp: m_tag_get failed\n"); + m_freem(m); + return -1; } - /* NOTREACHED */ + ((u_int16_t *)(tag + 1))[0] = sport; + ((u_int16_t *)(tag + 1))[1] = dport; + m_tag_prepend(m, tag); + +#ifdef IPSEC + ipsec4_common_input(m, iphdrlen, IPPROTO_ESP); +#else + esp4_input(m, iphdrlen); +#endif + + /* We handled it, it shouldn't be handled by UDP */ + *mp = NULL; /* avoid free by caller ... */ + return 1; } +#endif