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 1.34 retrieving revision 1.174 diff -u -p -r1.34 -r1.174 --- src/sys/netinet/udp_usrreq.c 1996/09/09 14:51:23 1.34 +++ src/sys/netinet/udp_usrreq.c 2009/01/19 02:27:57 1.174 @@ -1,7 +1,36 @@ -/* $NetBSD: udp_usrreq.c,v 1.34 1996/09/09 14:51:23 mycroft Exp $ */ +/* $NetBSD: udp_usrreq.c,v 1.174 2009/01/19 02:27:57 christos 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 +57,19 @@ * 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 1.174 2009/01/19 02:27:57 christos 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 @@ -45,8 +80,7 @@ #include #include #include - -#include +#include #include #include @@ -61,119 +95,651 @@ #include #include #include +#include + +#ifdef INET6 +#include +#include +#include +#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 +#include +#include +#ifdef INET6 +#include +#endif +#endif /* FAST_IPSEC */ + +#ifdef IPSEC +#include +#include +#include +#include +#endif /* IPSEC */ + +#ifdef COMPAT_50 +#include +#endif + +#ifdef IPKDB +#include +#endif + /* * UDP protocol implementation. * Per RFC 768, August, 1980. */ -#ifndef COMPAT_42 int udpcksum = 1; -#else -int udpcksum = 0; /* XXX */ -#endif +int udp_do_loopback_cksum = 0; -static void udp_notify __P((struct inpcb *, int)); -static struct mbuf *udp_saveopt __P((caddr_t, int, int)); +struct inpcbtable udbtable; + +percpu_t *udpstat_percpu; + +#ifdef INET +#ifdef IPSEC_NAT_T +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 +#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); +static int udp6_input_checksum(struct mbuf *, const struct udphdr *, int, 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 = 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) */ + +#if defined(INET6) +struct evcnt udp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "udp6", "hwcsum bad"); +struct evcnt udp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "udp6", "hwcsum ok"); +struct evcnt udp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "udp6", "hwcsum data"); +struct evcnt udp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, + NULL, "udp6", "swcsum"); + +EVCNT_ATTACH_STATIC(udp6_hwcsum_bad); +EVCNT_ATTACH_STATIC(udp6_hwcsum_ok); +EVCNT_ATTACH_STATIC(udp6_hwcsum_data); +EVCNT_ATTACH_STATIC(udp6_swcsum); +#endif /* defined(INET6) */ + +#define UDP_CSUM_COUNTER_INCR(ev) (ev)->ev_count++ + +#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 + udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS); +#endif +#ifdef INET6 + udp6stat_percpu = percpu_alloc(sizeof(uint64_t) * UDP6_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) { - in_pcbinit(&udbtable, udbhashsize); + 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 + } +#ifdef DIAGNOSTIC + panic("udp_input_checksum: unknown af %d", af); +#endif + /* NOTREACHED */ + 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; + +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 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); - 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, iphlen + len - ip_len); + } + + /* + * Checksum extended UDP header and data. + */ + if (udp4_input_checksum(m, uh, iphlen, len)) + goto badcsum; + + /* 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; + } +#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)) { + UDP_STATINC(UDP_STAT_NOPORTBCAST); + goto bad; + } + 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))) { + /* + * It was a debugger connect packet, + * just drop it now + */ goto bad; } - m_adj(m, len - ip->ip_len); - /* ip->ip_len = len; */ +#endif + icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); + m = NULL; } + +bad: + if (m) + m_freem(m); + return; + +badcsum: + m_freem(m); +} +#endif + +#ifdef INET6 +static int +udp6_input_checksum(struct mbuf *m, const struct udphdr *uh, int off, int len) +{ + /* - * Save a copy of the IP header in case we want restore it - * for sending an ICMP error message in response. + * XXX it's better to record and check if this mbuf is + * already checked. */ - save_ip = *ip; + if (__predict_false((m->m_flags & M_LOOP) && !udp_do_loopback_cksum)) { + goto good; + } + if (uh->uh_sum == 0) { + UDP6_STATINC(UDP6_STAT_NOSUM); + goto bad; + } + + switch (m->m_pkthdr.csum_flags & + ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv6) | + M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { + case M_CSUM_UDPv6|M_CSUM_TCP_UDP_BAD: + UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_bad); + UDP6_STATINC(UDP6_STAT_BADSUM); + goto bad; + +#if 0 /* notyet */ + case M_CSUM_UDPv6|M_CSUM_DATA: +#endif + + case M_CSUM_UDPv6: + /* Checksum was okay. */ + UDP_CSUM_COUNTER_INCR(&udp6_hwcsum_ok); + break; + + default: + /* + * Need to compute it ourselves. Maybe skip checksum + * on loopback interfaces. + */ + UDP_CSUM_COUNTER_INCR(&udp6_swcsum); + if (in6_cksum(m, IPPROTO_UDP, off, len) != 0) { + UDP6_STATINC(UDP6_STAT_BADSUM); + goto bad; + } + } + +good: + return 0; +bad: + return -1; +} + +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 + + UDP6_STATINC(UDP6_STAT_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) { + IP6_STATINC(IP6_STAT_TOOSHORT); + return IPPROTO_DONE; + } + KASSERT(UDP_HDR_ALIGNED_P(uh)); + ulen = ntohs((u_short)uh->uh_ulen); /* - * Checksum extended UDP header and data. + * RFC2675 section 4: jumbograms will have 0 in the UDP header field, + * iff payload length > 0xffff. */ - 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 (ulen == 0 && plen > 0xffff) + ulen = plen; + + if (plen != ulen) { + UDP6_STATINC(UDP6_STAT_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. Maybe skip checksum + * on loopback interfaces. + */ + if (udp6_input_checksum(m, uh, off, ulen)) + goto bad; + + /* + * Construct source and dst sockaddrs. + */ + bzero(&src, sizeof(src)); + src.sin6_family = AF_INET6; + src.sin6_len = sizeof(struct sockaddr_in6); + src.sin6_addr = ip6->ip6_src; + src.sin6_port = uh->uh_sport; + bzero(&dst, sizeof(dst)); + dst.sin6_family = AF_INET6; + dst.sin6_len = sizeof(struct sockaddr_in6); + dst.sin6_addr = ip6->ip6_dst; + dst.sin6_port = uh->uh_dport; + + if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { + if (m->m_flags & M_MCAST) { + UDP6_STATINC(UDP6_STAT_NOPORTMCAST); + goto bad; } + UDP6_STATINC(UDP6_STAT_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(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)) { + 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 && (inp->inp_flags & INP_CONTROLOPTS +#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); + } +} +#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)) { + IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO); + if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) + icmp6_error(n, ICMP6_DST_UNREACH, + ICMP6_DST_UNREACH_ADMIN, 0); + return; + } +#endif /*IPSEC*/ + + if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { + if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS +#ifdef SO_OTIMESTAMP + || in6p->in6p_socket->so_options & SO_OTIMESTAMP +#endif + || 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); + so->so_rcv.sb_overflowed++; + UDP6_STATINC(UDP6_STAT_FULLSOCK); + } else + sorwakeup(so); + } +} +#endif + +#ifdef INET +static int +udp4_realinput(struct sockaddr_in *src, struct sockaddr_in *dst, + struct mbuf **mp, int off /* offset of udphdr */) +{ + u_int16_t *sport, *dport; + int rcvcnt; + struct in_addr *src4, *dst4; + struct inpcb_hdr *inph; + struct inpcb *inp; + struct mbuf *m = *mp; + + 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 @@ -191,204 +757,238 @@ 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_port = uh->uh_sport; - udpsrc.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 = 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 (sbappendaddr(&last->so_rcv, - sintosa(&udpsrc), 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(&udpsrc), m, - (struct mbuf *)0) == 0) { - udpstat.udps_fullsock++; - goto bad; - } - sorwakeup(last); - return; - } - /* - * Locate pcb for datagram. - */ - 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); + } else { + /* + * Locate pcb for datagram. + */ + inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); if (inp == 0) { - udpstat.udps_noport++; - if (m->m_flags & (M_BCAST | M_MCAST)) { - udpstat.udps_noportbcast++; + UDP_STATINC(UDP_STAT_PCBHASHMISS); + inp = in_pcblookup_bind(&udbtable, *dst4, *dport); + if (inp == 0) + return rcvcnt; + } + +#ifdef IPSEC_NAT_T + /* Handle ESP over UDP */ + if (inp->inp_flags & INP_ESPINUDP_ALL) { + struct sockaddr *sa = (struct sockaddr *)src; + + switch(udp4_espinudp(mp, off, sa, inp->inp_socket)) { + 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 + + udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); + 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_port = uh->uh_sport; - udpsrc.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; - } +bad: + return rcvcnt; +} #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(&udpsrc), m, - opts) == 0) { - udpstat.udps_fullsock++; + +#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; + + src6 = src->sin6_addr; + if (sa6_recoverscope(src) != 0) { + /* XXX: should be impossible. */ goto bad; } - sorwakeup(inp->inp_socket); - return; -bad: - m_freem(m); - if (opts) - m_freem(opts); -} + sport = src->sin6_port; -/* - * 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); + dport = dst->sin6_port; + dst4 = (struct in_addr *)&dst->sin6_addr.s6_addr[12]; + dst6 = &dst->sin6_addr; + + 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++; + + /* + * 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) { + UDP_STATINC(UDP_STAT_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; - 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, const 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]; @@ -399,30 +999,112 @@ udp_ctlinput(cmd, sa, v) else if (errno == 0) return NULL; if (ip) { - uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); - in_pcbnotify(&udbtable, satosin(sa)->sin_addr, uh->uh_dport, + uh = (struct udphdr *)((char *)ip + (ip->ip_hl << 2)); + in_pcbnotify(&udbtable, satocsin(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, + in_pcbnotifyall(&udbtable, satocsin(sa)->sin_addr, errno, notify); return NULL; } int -#if __STDC__ -udp_output(struct mbuf *m, ...) -#else -udp_output(m, va_alist) - struct mbuf *m; - va_dcl +udp_ctloutput(int op, struct socket *so, struct sockopt *sopt) +{ + int s; + int error = 0; + struct inpcb *inp; + int family; + int optval; + + 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; + + switch(optval) { +#ifdef IPSEC_NAT_T + case 0: + inp->inp_flags &= ~INP_ESPINUDP_ALL; + break; + + case UDP_ENCAP_ESPINUDP: + inp->inp_flags &= ~INP_ESPINUDP_ALL; + inp->inp_flags |= INP_ESPINUDP; + break; + + case UDP_ENCAP_ESPINUDP_NON_IKE: + inp->inp_flags &= ~INP_ESPINUDP_ALL; + inp->inp_flags |= INP_ESPINUDP_NON_IKE; + break; +#endif + default: + error = EINVAL; + break; + } + 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; - register struct udpiphdr *ui; - register int len = m->m_pkthdr.len; + struct inpcb *inp; + 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 *); va_end(ap); @@ -438,67 +1120,94 @@ 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; + ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); + + ro = &inp->inp_route; /* - * 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, + UDP_STATINC(UDP_STAT_OPACKETS); + + return (ip_output(m, inp->inp_options, ro, inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), - inp->inp_moptions)); + 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, 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 lwp *l) { - 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)); + return (in_control(so, (long)m, (void *)nam, + (struct ifnet *)control, l)); s = splsoftnet(); + + if (req == PRU_PURGEIF) { + mutex_enter(softnet_lock); + in_pcbpurgeif0(&udbtable, (struct ifnet *)control); + in_purgeif((struct ifnet *)control); + in_pcbpurgeif(&udbtable, (struct ifnet *)control); + mutex_exit(softnet_lock); + splx(s); + return (0); + } + 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) { + if (req == PRU_ATTACH) { + sosetlock(so); + } else if (inp == 0) { error = EINVAL; goto release; } @@ -514,6 +1223,11 @@ 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) @@ -531,7 +1245,7 @@ udp_usrreq(so, req, m, nam, control, p) break; case PRU_BIND: - error = in_pcbbind(inp, nam, p); + error = in_pcbbind(inp, nam, l); break; case PRU_LISTEN: @@ -539,7 +1253,7 @@ udp_usrreq(so, req, m, nam, control, p) break; case PRU_CONNECT: - error = in_pcbconnect(inp, nam); + error = in_pcbconnect(inp, nam, l); if (error) break; soisconnected(so); @@ -554,6 +1268,7 @@ udp_usrreq(so, req, m, nam, control, p) so->so_state &= ~SS_ISCONNECTED; /* XXX */ in_pcbdisconnect(inp); inp->inp_laddr = zeroin_addr; /* XXX */ + in_pcbstate(inp, INP_BOUND); /* XXX */ break; case PRU_SHUTDOWN: @@ -572,20 +1287,17 @@ udp_usrreq(so, req, m, nam, control, p) break; } { - struct in_addr laddr; + struct in_addr laddr; /* XXX */ if (nam) { - laddr = inp->inp_laddr; + laddr = inp->inp_laddr; /* XXX */ if ((so->so_state & SS_ISCONNECTED) != 0) { error = EISCONN; goto die; } - error = in_pcbconnect(inp, nam); - if (error) { - die: - m_freem(m); - break; - } + error = in_pcbconnect(inp, nam, l); + if (error) + goto die; } else { if ((so->so_state & SS_ISCONNECTED) == 0) { error = ENOTCONN; @@ -593,10 +1305,15 @@ udp_usrreq(so, req, m, nam, control, p) } } error = udp_output(m, inp); + m = NULL; if (nam) { in_pcbdisconnect(inp); - inp->inp_laddr = laddr; + inp->inp_laddr = laddr; /* XXX */ + in_pcbstate(inp, INP_BOUND); /* XXX */ } + die: + if (m) + m_freem(m); } break; @@ -634,27 +1351,226 @@ release: return (error); } +static int +sysctl_net_inet_udp_stats(SYSCTLFN_ARGS) +{ + + 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); +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", + 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_NAT_T) +/* + * 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; + struct inpcb *inp; + size_t skip = 0; + size_t minlen; + size_t iphdrlen; + struct ip *ip; + struct mbuf *n; + struct m_tag *tag; + struct udphdr *udphdr; + u_int16_t sport, dport; + struct mbuf *m = *mp; + + /* + * 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; } - /* NOTREACHED */ + + len = m->m_len - off; + data = mtod(m, char *) + off; + inp = sotoinpcb(so); + + /* Ignore keepalive packets */ + if ((len == 1) && (*(unsigned char *)data == 0xff)) { + return 1; + } + + /* + * Check that the payload is long enough to hold + * an ESP header and compute the length of encapsulation + * header to remove + */ + if (inp->inp_flags & 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 (inp->inp_flags & 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; + + /* + * Copy the mbuf to avoid multiple free, as both + * esp4_input (which we call) and udp_input (which + * called us) free the mbuf. + */ + if ((n = m_dup(m, 0, M_COPYALL, M_DONTWAIT)) == NULL) { + printf("udp4_espinudp: m_dup failed\n"); + return 0; + } + + /* + * 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(n); + return 0; + } + ((u_int16_t *)(tag + 1))[0] = sport; + ((u_int16_t *)(tag + 1))[1] = dport; + m_tag_prepend(n, tag); + +#ifdef FAST_IPSEC + ipsec4_common_input(n, iphdrlen, IPPROTO_ESP); +#else + esp4_input(n, iphdrlen); +#endif + + /* We handled it, it shoudln't be handled by UDP */ + return 1; } +#endif