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 1.96 retrieving revision 1.252 diff -u -p -r1.96 -r1.252 --- src/sys/netinet/udp_usrreq.c 2002/08/14 00:23:36 1.96 +++ src/sys/netinet/udp_usrreq.c 2018/05/18 18:58:51 1.252 @@ -1,4 +1,4 @@ -/* $NetBSD: udp_usrreq.c,v 1.96 2002/08/14 00:23:36 itojun Exp $ */ +/* $NetBSD: udp_usrreq.c,v 1.252 2018/05/18 18:58:51 maxv Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. @@ -41,11 +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. * @@ -64,29 +60,35 @@ * @(#)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 1.96 2002/08/14 00:23:36 itojun Exp $"); +__KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c,v 1.252 2018/05/18 18:58:51 maxv Exp $"); +#ifdef _KERNEL_OPT #include "opt_inet.h" #include "opt_ipsec.h" #include "opt_inet_csum.h" #include "opt_ipkdb.h" +#include "opt_mbuftrace.h" +#include "opt_net_mpsafe.h" +#endif #include -#include #include +#include #include #include #include -#include -#include #include #include #include #include #include -#include #include #include @@ -97,75 +99,72 @@ __KERNEL_RCSID(0, "$NetBSD: udp_usrreq.c #include #include #include +#include #ifdef INET6 #include -#include #include +#include #include #include +#include #endif -#ifdef PULLDOWN_TEST #ifndef INET6 -/* always need ip6.h for IP6_EXTHDR_GET */ #include #endif -#endif - -#include "faith.h" -#if defined(NFAITH) && NFAITH > 0 -#include -#endif - -#include #ifdef IPSEC -#include -#include -#endif /*IPSEC*/ +#include +#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 udpcksum = 1; +int udp_do_loopback_cksum = 0; + +struct inpcbtable udbtable; -struct inpcbtable udbtable; -struct udpstat udpstat; +percpu_t *udpstat_percpu; #ifdef INET -static void udp4_sendup __P((struct mbuf *, int, struct sockaddr *, - struct socket *)); -static int udp4_realinput __P((struct sockaddr_in *, struct sockaddr_in *, - struct mbuf *, int)); +#ifdef IPSEC +static int udp4_espinudp(struct mbuf **, int, struct socket *); #endif -#ifdef INET6 -static void udp6_sendup __P((struct mbuf *, int, struct sockaddr *, - struct socket *)); -static int udp6_realinput __P((int, struct sockaddr_in6 *, - struct sockaddr_in6 *, struct mbuf *, int)); +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 INET -static void udp_notify __P((struct inpcb *, int)); +static void udp_notify (struct inpcb *, int); #endif #ifndef UDBHASHSIZE #define UDBHASHSIZE 128 #endif -int udbhashsize = UDBHASHSIZE; +int udbhashsize = UDBHASHSIZE; + +/* + * For send - really max datagram size; for receive - 40 1K datagrams. + */ +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, @@ -175,94 +174,187 @@ struct evcnt udp_hwcsum_data = EVCNT_INI 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); +#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 **); + +static int +do_udpinit(void) +{ + + in_pcbinit(&udbtable, udbhashsize, udbhashsize); + udpstat_percpu = percpu_alloc(sizeof(uint64_t) * UDP_NSTATS); + + MOWNER_ATTACH(&udp_tx_mowner); + MOWNER_ATTACH(&udp_rx_mowner); + MOWNER_ATTACH(&udp_mowner); + + return 0; +} + +void +udp_init_common(void) +{ + static ONCE_DECL(doudpinit); + + RUN_ONCE(&doudpinit, do_udpinit); +} + void -udp_init() +udp_init(void) +{ + + sysctl_net_inet_udp_setup(NULL); + + udp_init_common(); +} + +/* + * 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 - in_pcbinit(&udbtable, udbhashsize, udbhashsize); + case AF_INET: + return udp4_input_checksum(m, uh, iphlen, len); #endif - -#ifdef UDP_CSUM_COUNTERS - evcnt_attach_static(&udp_hwcsum_bad); - evcnt_attach_static(&udp_hwcsum_ok); - evcnt_attach_static(&udp_hwcsum_data); - evcnt_attach_static(&udp_swcsum); -#endif /* UDP_CSUM_COUNTERS */ +#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_get_rcvif_NOMPSAFE(m)->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_get_rcvif_NOMPSAFE(m)->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 { va_list ap; struct sockaddr_in src, dst; struct ip *ip; struct udphdr *uh; - int iphlen, proto; + int iphlen; int len; int n; u_int16_t ip_len; va_start(ap, m); iphlen = va_arg(ap, int); - proto = va_arg(ap, int); + (void)va_arg(ap, int); /* ignore value, advance ap */ va_end(ap); - udpstat.udps_ipackets++; + MCLAIM(m, &udp_rx_mowner); + UDP_STATINC(UDP_STAT_IPACKETS); -#ifndef PULLDOWN_TEST /* - * Strip IP options, if any; should skip this, - * make available to user, and use on returned packets, - * but we don't yet have a way to check the checksum - * with options still present. + * Get IP and UDP header together in first mbuf. */ - if (iphlen > sizeof (struct ip)) { - ip_stripoptions(m, (struct mbuf *)0); - iphlen = sizeof(struct ip); + ip = mtod(m, struct ip *); + M_REGION_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); + if (uh == NULL) { + UDP_STATINC(UDP_STAT_HDROPS); + return; } -#else - /* - * we may enable the above code if we save and pass IPv4 options - * to the userland. - */ -#endif /* - * Get IP and UDP header together in first mbuf. + * Enforce alignment requirements that are violated in + * some cases, see kern/50766 for details. */ - ip = mtod(m, struct ip *); -#ifndef PULLDOWN_TEST - if (m->m_len < iphlen + sizeof(struct udphdr)) { - if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { - udpstat.udps_hdrops++; + if (UDP_HDR_ALIGNED_P(uh) == 0) { + m = m_copyup(m, iphlen + sizeof(struct udphdr), 0); + if (m == NULL) { + UDP_STATINC(UDP_STAT_HDROPS); return; } ip = mtod(m, struct ip *); + uh = (struct udphdr *)(mtod(m, char *) + iphlen); } - uh = (struct udphdr *)((caddr_t)ip + iphlen); -#else - IP6_EXTHDR_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); - if (uh == NULL) { - udpstat.udps_hdrops++; - return; - } -#endif KASSERT(UDP_HDR_ALIGNED_P(uh)); /* destination port of 0 is illegal, based on RFC768. */ @@ -275,9 +367,13 @@ udp_input(m, va_alist) */ ip_len = ntohs(ip->ip_len); len = ntohs((u_int16_t)uh->uh_ulen); + if (len < sizeof(struct udphdr)) { + UDP_STATINC(UDP_STAT_BADLEN); + goto bad; + } if (ip_len != iphlen + len) { - if (ip_len < iphlen + len || len < sizeof(struct udphdr)) { - udpstat.udps_badlen++; + if (ip_len < iphlen + len) { + UDP_STATINC(UDP_STAT_BADLEN); goto bad; } m_adj(m, iphlen + len - ip_len); @@ -286,64 +382,46 @@ udp_input(m, va_alist) /* * Checksum extended UDP header and data. */ - if (uh->uh_sum) { - switch (m->m_pkthdr.csum_flags & - ((m->m_pkthdr.rcvif->if_csum_flags_rx & M_CSUM_UDPv4) | - M_CSUM_TCP_UDP_BAD | M_CSUM_DATA)) { - case M_CSUM_UDPv4|M_CSUM_TCP_UDP_BAD: - UDP_CSUM_COUNTER_INCR(&udp_hwcsum_bad); - goto badcsum; - - case M_CSUM_UDPv4|M_CSUM_DATA: - UDP_CSUM_COUNTER_INCR(&udp_hwcsum_data); - if ((m->m_pkthdr.csum_data ^ 0xffff) != 0) - goto badcsum; - break; + if (udp4_input_checksum(m, uh, iphlen, len)) + goto badcsum; - case M_CSUM_UDPv4: - /* Checksum was okay. */ - UDP_CSUM_COUNTER_INCR(&udp_hwcsum_ok); - break; + /* 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); - default: - /* Need to compute it ourselves. */ - UDP_CSUM_COUNTER_INCR(&udp_swcsum); - if (in4_cksum(m, IPPROTO_UDP, iphlen, len) != 0) - goto badcsum; - break; - } + if ((n = udp4_realinput(&src, &dst, &m, iphlen)) == -1) { + UDP_STATINC(UDP_STAT_HDROPS); + return; + } + if (m == NULL) { + /* + * packet has been processed by ESP stuff - + * e.g. dropped NAT-T-keep-alive-packet ... + */ + return; } - /* construct source and dst sockaddrs. */ - bzero(&src, sizeof(src)); - src.sin_family = AF_INET; - src.sin_len = sizeof(struct sockaddr_in); - bcopy(&ip->ip_src, &src.sin_addr, sizeof(src.sin_addr)); - src.sin_port = uh->uh_sport; - bzero(&dst, sizeof(dst)); - dst.sin_family = AF_INET; - dst.sin_len = sizeof(struct sockaddr_in); - bcopy(&ip->ip_dst, &dst.sin_addr, sizeof(dst.sin_addr)); - dst.sin_port = uh->uh_dport; + ip = mtod(m, struct ip *); + M_REGION_GET(uh, struct udphdr *, m, iphlen, sizeof(struct udphdr)); + if (uh == NULL) { + UDP_STATINC(UDP_STAT_HDROPS); + return; + } + /* XXX Re-enforce alignment? */ - 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)); + 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; - bcopy(&ip->ip_src, &src6.sin6_addr.s6_addr[12], - sizeof(ip->ip_src)); + in6_in_2_v4mapin6(&ip->ip_src, &src6.sin6_addr); src6.sin6_port = uh->uh_sport; - bzero(&dst6, sizeof(dst6)); + 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; - bcopy(&ip->ip_dst, &dst6.sin6_addr.s6_addr[12], - sizeof(ip->ip_dst)); + in6_in_2_v4mapin6(&ip->ip_dst, &dst6.sin6_addr); dst6.sin6_port = uh->uh_dport; n += udp6_realinput(AF_INET, &src6, &dst6, m, iphlen); @@ -352,14 +430,14 @@ udp_input(m, va_alist) if (n == 0) { if (m->m_flags & (M_BCAST | M_MCAST)) { - udpstat.udps_noportbcast++; + UDP_STATINC(UDP_STAT_NOPORTBCAST); goto bad; } - udpstat.udps_noport++; + 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))) { + m, iphlen + sizeof(struct udphdr), + m->m_pkthdr.len - iphlen - sizeof(struct udphdr))) { /* * It was a debugger connect packet, * just drop it now @@ -378,215 +456,46 @@ bad: badcsum: m_freem(m); - udpstat.udps_badsum++; -} -#endif - -#ifdef INET6 -int -udp6_input(mp, offp, proto) - struct mbuf **mp; - int *offp, proto; -{ - struct mbuf *m = *mp; - int off = *offp; - struct sockaddr_in6 src, dst; - struct ip6_hdr *ip6; - struct udphdr *uh; - u_int32_t plen, ulen; - -#ifndef PULLDOWN_TEST - IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE); -#endif - ip6 = mtod(m, struct ip6_hdr *); - -#if defined(NFAITH) && 0 < NFAITH - if (faithprefix(&ip6->ip6_dst)) { - /* send icmp6 host unreach? */ - m_freem(m); - return IPPROTO_DONE; - } -#endif - - udp6stat.udp6s_ipackets++; - - /* check for jumbogram is done in ip6_input. we can trust pkthdr.len */ - plen = m->m_pkthdr.len - off; -#ifndef PULLDOWN_TEST - uh = (struct udphdr *)((caddr_t)ip6 + off); -#else - IP6_EXTHDR_GET(uh, struct udphdr *, m, off, sizeof(struct udphdr)); - if (uh == NULL) { - ip6stat.ip6s_tooshort++; - return IPPROTO_DONE; - } -#endif - 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 == 0) - udp6stat.udp6s_nosum++; - else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) { - udp6stat.udp6s_badsum++; - goto bad; - } - - /* - * Construct source and dst sockaddrs. - * Note that ifindex (s6_addr16[1]) is already filled. - */ - bzero(&src, sizeof(src)); - src.sin6_family = AF_INET6; - src.sin6_len = sizeof(struct sockaddr_in6); - /* KAME hack: recover scopeid */ - (void)in6_recoverscope(&src, &ip6->ip6_src, m->m_pkthdr.rcvif); - src.sin6_port = uh->uh_sport; - bzero(&dst, sizeof(dst)); - dst.sin6_family = AF_INET6; - dst.sin6_len = sizeof(struct sockaddr_in6); - /* KAME hack: recover scopeid */ - (void)in6_recoverscope(&dst, &ip6->ip6_dst, m->m_pkthdr.rcvif); - dst.sin6_port = uh->uh_dport; - - if (udp6_realinput(AF_INET6, &src, &dst, m, off) == 0) { - if (m->m_flags & M_MCAST) { - udp6stat.udp6s_noportmcast++; - goto bad; - } - udp6stat.udp6s_noport++; - icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0); - m = NULL; - } - -bad: - if (m) - m_freem(m); - return IPPROTO_DONE; } #endif #ifdef INET static void -udp4_sendup(m, off, src, so) - struct mbuf *m; - int off; /* offset of data portion */ - struct sockaddr *src; - struct socket *so; +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; -#ifdef INET6 - struct in6pcb *in6p = NULL; -#endif + struct inpcb *inp; - if (!so) - return; - switch (so->so_proto->pr_domain->dom_family) { - case AF_INET: - inp = sotoinpcb(so); - break; -#ifdef INET6 - case AF_INET6: - in6p = sotoin6pcb(so); - break; -#endif - default: - return; - } + KASSERT(so != NULL); + KASSERT(so->so_proto->pr_domain->dom_family == AF_INET); + inp = sotoinpcb(so); + KASSERT(inp != NULL); -#ifdef IPSEC - /* check AH/ESP integrity. */ - if (so != NULL && ipsec4_in_reject_so(m, so)) { - ipsecstat.in_polvio++; +#if defined(IPSEC) + if (ipsec_used && ipsec_in_reject(m, inp)) { + if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) + icmp_error(n, ICMP_UNREACH, ICMP_UNREACH_ADMIN_PROHIBIT, + 0, 0); return; } -#endif /*IPSEC*/ +#endif - if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { - if (inp && (inp->inp_flags & INP_CONTROLOPTS - || so->so_options & SO_TIMESTAMP)) { + if ((n = m_copypacket(m, M_DONTWAIT)) != NULL) { + if (inp->inp_flags & INP_CONTROLOPTS || + SOOPT_TIMESTAMP(so->so_options)) { struct ip *ip = mtod(n, struct ip *); ip_savecontrol(inp, &opts, ip, n); } m_adj(n, off); - if (sbappendaddr(&so->so_rcv, src, n, - opts) == 0) { - m_freem(n); - if (opts) - m_freem(opts); - udpstat.udps_fullsock++; - } else - sorwakeup(so); - } -} -#endif - -#ifdef INET6 -static void -udp6_sendup(m, off, src, so) - struct mbuf *m; - int off; /* offset of data portion */ - struct sockaddr *src; - struct socket *so; -{ - struct mbuf *opts = NULL; - struct mbuf *n; - struct in6pcb *in6p = NULL; - - if (!so) - return; - if (so->so_proto->pr_domain->dom_family != AF_INET6) - return; - in6p = sotoin6pcb(so); - -#ifdef IPSEC - /* check AH/ESP integrity. */ - if (so != NULL && ipsec6_in_reject_so(m, so)) { - ipsec6stat.in_polvio++; - return; - } -#endif /*IPSEC*/ - - if ((n = m_copy(m, 0, M_COPYALL)) != NULL) { - if (in6p && (in6p->in6p_flags & IN6P_CONTROLOPTS - || in6p->in6p_socket->so_options & SO_TIMESTAMP)) { - struct ip6_hdr *ip6 = mtod(n, struct ip6_hdr *); - ip6_savecontrol(in6p, &opts, ip6, n); - } - - m_adj(n, off); if (sbappendaddr(&so->so_rcv, src, n, opts) == 0) { m_freem(n); if (opts) m_freem(opts); - udp6stat.udp6s_fullsock++; + UDP_STATINC(UDP_STAT_FULLSOCK); + soroverflow(so); } else sorwakeup(so); } @@ -595,16 +504,15 @@ udp6_sendup(m, off, src, so) #ifdef INET static int -udp4_realinput(src, dst, m, off) - struct sockaddr_in *src; - struct sockaddr_in *dst; - struct mbuf *m; - int off; /* offset of udphdr */ +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 */ @@ -618,8 +526,7 @@ udp4_realinput(src, dst, m, off) dport = &dst->sin_port; if (IN_MULTICAST(dst4->s_addr) || - in_broadcast(*dst4, m->m_pkthdr.rcvif)) { - struct inpcb *last; + in_broadcast(*dst4, m_get_rcvif_NOMPSAFE(m))) { /* * Deliver a multicast or broadcast datagram to *all* sockets * for which the local and remote addresses and ports match @@ -643,7 +550,11 @@ udp4_realinput(src, dst, m, off) /* * Locate pcb(s) for datagram. */ - CIRCLEQ_FOREACH(inp, &udbtable.inpt_queue, inp_queue) { + TAILQ_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)) { @@ -656,9 +567,8 @@ udp4_realinput(src, dst, m, off) continue; } - last = inp; udp4_sendup(m, off, (struct sockaddr *)src, - inp->inp_socket); + inp->inp_socket); rcvcnt++; /* @@ -677,14 +587,45 @@ udp4_realinput(src, dst, m, off) /* * Locate pcb for datagram. */ - inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, *dport); + inp = in_pcblookup_connect(&udbtable, *src4, *sport, *dst4, + *dport, 0); if (inp == 0) { - ++udpstat.udps_pcbhashmiss; + UDP_STATINC(UDP_STAT_PCBHASHMISS); inp = in_pcblookup_bind(&udbtable, *dst4, *dport); if (inp == 0) return rcvcnt; } +#ifdef IPSEC + /* Handle ESP over UDP */ + if (inp->inp_flags & INP_ESPINUDP_ALL) { + switch (udp4_espinudp(mp, off, inp->inp_socket)) { + case -1: /* Error, m was freed */ + rcvcnt = -1; + goto bad; + + case 1: /* ESP over UDP */ + rcvcnt++; + goto bad; + + case 0: /* plain UDP */ + default: /* Unexpected */ + /* + * Normal UDP processing will take place, + * m may have changed. + */ + m = *mp; + break; + } + } +#endif + + /* + * Check the minimum TTL for socket. + */ + if (mtod(m, struct ip *)->ip_ttl < inp->inp_ip_minttl) + goto bad; + udp4_sendup(m, off, (struct sockaddr *)src, inp->inp_socket); rcvcnt++; } @@ -694,198 +635,156 @@ bad: } #endif -#ifdef INET6 -static int -udp6_realinput(af, src, dst, m, off) - int af; /* af on packet */ - struct sockaddr_in6 *src; - struct sockaddr_in6 *dst; - struct mbuf *m; - int off; /* offset of udphdr */ +#ifdef INET +/* + * Notify a udp user of an asynchronous error; + * just wake up so that he can collect error status. + */ +static void +udp_notify(struct inpcb *inp, int errno) { - u_int16_t sport, dport; - int rcvcnt; - struct in6_addr src6, dst6; - const struct in_addr *dst4; - struct in6pcb *in6p; - - rcvcnt = 0; - off += sizeof(struct udphdr); /* now, offset of payload */ - - if (af != AF_INET && af != AF_INET6) - goto bad; - if (src->sin6_family != AF_INET6 || dst->sin6_family != AF_INET6) - goto bad; - - 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))) { - struct in6pcb *last; - /* - * Deliver a multicast or broadcast datagram to *all* sockets - * for which the local and remote addresses and ports match - * those of the incoming datagram. This allows more than - * one process to receive multi/broadcasts on the same port. - * (This really ought to be done for unicast datagrams as - * well, but that would cause problems with existing - * applications that open both address-specific sockets and - * a wildcard socket listening to the same port -- they would - * end up receiving duplicates of every unicast datagram. - * Those applications open the multiple sockets to overcome an - * inadequacy of the UDP socket interface, but for backwards - * compatibility we avoid the problem here rather than - * fixing the interface. Maybe 4.5BSD will remedy this?) - */ - - /* - * KAME note: traditionally we dropped udpiphdr from mbuf here. - * we need udpiphdr for IPsec processing so we do that later. - */ - /* - * Locate pcb(s) for datagram. - */ - for (in6p = udb6.in6p_next; in6p != &udb6; - in6p = in6p->in6p_next) { - if (in6p->in6p_lport != dport) - continue; - if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) { - if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &dst6)) - 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; - } - - last = in6p; - udp6_sendup(m, off, (struct sockaddr *)src, - in6p->in6p_socket); - rcvcnt++; - - /* - * Don't look for additional matches if this one does - * not have either the SO_REUSEPORT or SO_REUSEADDR - * socket options set. This heuristic avoids searching - * through all pcbs in the common case of a non-shared - * port. It assumes that an application will never - * clear these options after setting them. - */ - if ((in6p->in6p_socket->so_options & - (SO_REUSEPORT|SO_REUSEADDR)) == 0) - break; - } - } else { - /* - * Locate pcb for datagram. - */ - in6p = in6_pcblookup_connect(&udb6, &src6, sport, - &dst6, dport, 0); - if (in6p == 0) { - ++udpstat.udps_pcbhashmiss; - in6p = in6_pcblookup_bind(&udb6, &dst6, dport, 0); - if (in6p == 0) - 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) - struct inpcb *inp; - int errno; -{ - - inp->inp_socket->so_error = errno; - sorwakeup(inp->inp_socket); - sowwakeup(inp->inp_socket); -} + 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; +udp_ctlinput(int cmd, const struct sockaddr *sa, void *v) { struct ip *ip = v; struct udphdr *uh; - void (*notify) __P((struct inpcb *, int)) = udp_notify; + void (*notify)(struct inpcb *, int) = udp_notify; int errno; - if (sa->sa_family != AF_INET - || sa->sa_len != sizeof(struct sockaddr_in)) + 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) + if (PRC_IS_REDIRECT(cmd)) { + notify = in_rtchange; + ip = NULL; + } else if (cmd == PRC_HOSTDEAD) { + ip = NULL; + } 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, + } else { + 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 -#endif +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) { + 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; + 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, struct inpcb *inp, struct mbuf *control, + struct lwp *l) +{ struct udpiphdr *ui; + struct route *ro; + struct ip_pktopts pktopts; + kauth_cred_t cred; int len = m->m_pkthdr.len; - int error = 0; - va_list ap; + int error, flags = 0; - va_start(ap, m); - inp = va_arg(ap, struct inpcb *); - va_end(ap); + MCLAIM(m, &udp_tx_mowner); /* * Calculate data length and get a mbuf * for UDP and IP headers. */ M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT); - if (m == 0) { + if (m == NULL) { error = ENOBUFS; goto release; } @@ -899,18 +798,36 @@ udp_output(m, va_alist) goto release; } + if (l == NULL) + cred = NULL; + else + cred = l->l_cred; + + /* Setup IP outgoing packet options */ + memset(&pktopts, 0, sizeof(pktopts)); + error = ip_setpktopts(control, &pktopts, &flags, inp, cred); + if (error != 0) + goto release; + + if (control != NULL) { + m_freem(control); + control = NULL; + } + /* * Fill in mbuf with extended UDP header * and addresses and length put into network format. */ ui = mtod(m, struct udpiphdr *); ui->ui_pr = IPPROTO_UDP; - ui->ui_src = inp->inp_laddr; + ui->ui_src = pktopts.ippo_laddr.sin_addr; ui->ui_dst = inp->inp_faddr; ui->ui_sport = inp->inp_lport; ui->ui_dport = inp->inp_fport; ui->ui_ulen = htons((u_int16_t)len + sizeof(struct udphdr)); + ro = &inp->inp_route; + /* * Set up checksum and output datagram. */ @@ -926,226 +843,578 @@ udp_output(m, va_alist) 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_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++; + UDP_STATINC(UDP_STAT_OPACKETS); -#ifdef IPSEC - if (ipsec_setsocket(m, inp->inp_socket) != 0) { - error = ENOBUFS; - goto release; - } -#endif /*IPSEC*/ - - return (ip_output(m, inp->inp_options, &inp->inp_route, - inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST), - inp->inp_moptions)); + flags |= inp->inp_socket->so_options & (SO_DONTROUTE|SO_BROADCAST); + return ip_output(m, inp->inp_options, ro, flags, pktopts.ippo_imo, inp); -release: + release: + if (control != NULL) + m_freem(control); m_freem(m); - return (error); + return error; } -int udp_sendspace = 9216; /* really max datagram size */ -int udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in)); - /* 40 1K datagrams */ +static int +udp_attach(struct socket *so, int proto) +{ + struct inpcb *inp; + int error; -/*ARGSUSED*/ -int -udp_usrreq(so, req, m, nam, control, p) - struct socket *so; - int req; - struct mbuf *m, *nam, *control; - struct proc *p; + KASSERT(sotoinpcb(so) == NULL); + + /* Assign the lock (must happen even if we will error out). */ + sosetlock(so); + +#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) { + return error; + } + } + + error = in_pcballoc(so, &udbtable); + if (error) { + return error; + } + inp = sotoinpcb(so); + inp->inp_ip.ip_ttl = ip_defttl; + KASSERT(solocked(so)); + + return error; +} + +static void +udp_detach(struct socket *so) { struct inpcb *inp; - int s; + + KASSERT(solocked(so)); + inp = sotoinpcb(so); + KASSERT(inp != NULL); + in_pcbdetach(inp); +} + +static int +udp_accept(struct socket *so, struct sockaddr *nam) +{ + KASSERT(solocked(so)); + + panic("udp_accept"); + + return EOPNOTSUPP; +} + +static int +udp_bind(struct socket *so, struct sockaddr *nam, struct lwp *l) +{ + struct inpcb *inp = sotoinpcb(so); + struct sockaddr_in *sin = (struct sockaddr_in *)nam; int error = 0; + int s; - 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); - } + KASSERT(solocked(so)); + KASSERT(inp != NULL); + KASSERT(nam != NULL); s = splsoftnet(); - inp = sotoinpcb(so); -#ifdef DIAGNOSTIC - if (req != PRU_SEND && req != PRU_SENDOOB && control) - panic("udp_usrreq: unexpected control mbuf"); -#endif - if (inp == 0 && req != PRU_ATTACH) { - error = EINVAL; - goto release; - } + error = in_pcbbind(inp, sin, l); + splx(s); - /* - * Note: need to block udp_input while changing - * the udp pcb queue and/or pcb addresses. - */ - switch (req) { + return error; +} - case PRU_ATTACH: - if (inp != 0) { - error = EISCONN; - break; - } - if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) { - error = soreserve(so, udp_sendspace, udp_recvspace); - if (error) - break; - } - error = in_pcballoc(so, &udbtable); - if (error) - break; - inp = sotoinpcb(so); - inp->inp_ip.ip_ttl = ip_defttl; - break; +static int +udp_listen(struct socket *so, struct lwp *l) +{ + KASSERT(solocked(so)); - case PRU_DETACH: - in_pcbdetach(inp); - break; + return EOPNOTSUPP; +} - case PRU_BIND: - error = in_pcbbind(inp, nam, p); - break; +static int +udp_connect(struct socket *so, struct sockaddr *nam, struct lwp *l) +{ + struct inpcb *inp = sotoinpcb(so); + int error = 0; + int s; - case PRU_LISTEN: - error = EOPNOTSUPP; - break; + KASSERT(solocked(so)); + KASSERT(inp != NULL); + KASSERT(nam != NULL); - case PRU_CONNECT: - error = in_pcbconnect(inp, nam); - if (error) - break; + s = splsoftnet(); + error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l); + if (! error) soisconnected(so); - break; + splx(s); + return error; +} - case PRU_CONNECT2: - error = EOPNOTSUPP; - break; +static int +udp_connect2(struct socket *so, struct socket *so2) +{ + KASSERT(solocked(so)); - case PRU_DISCONNECT: - /*soisdisconnected(so);*/ - so->so_state &= ~SS_ISCONNECTED; /* XXX */ - in_pcbdisconnect(inp); - inp->inp_laddr = zeroin_addr; /* XXX */ - in_pcbstate(inp, INP_BOUND); /* XXX */ - break; + return EOPNOTSUPP; +} - case PRU_SHUTDOWN: - socantsendmore(so); - break; +static int +udp_disconnect(struct socket *so) +{ + struct inpcb *inp = sotoinpcb(so); + int s; - case PRU_RCVD: - error = EOPNOTSUPP; - break; + KASSERT(solocked(so)); + KASSERT(inp != NULL); - case PRU_SEND: - if (control && control->m_len) { - m_freem(control); - m_freem(m); - error = EINVAL; - break; - } - { - struct in_addr laddr; /* XXX */ + s = splsoftnet(); + /*soisdisconnected(so);*/ + so->so_state &= ~SS_ISCONNECTED; /* XXX */ + in_pcbdisconnect(inp); + inp->inp_laddr = zeroin_addr; /* XXX */ + in_pcbstate(inp, INP_BOUND); /* XXX */ + splx(s); - if (nam) { - laddr = inp->inp_laddr; /* XXX */ - if ((so->so_state & SS_ISCONNECTED) != 0) { - error = EISCONN; - goto die; - } - error = in_pcbconnect(inp, nam); - if (error) { - die: - m_freem(m); - break; - } - } else { - if ((so->so_state & SS_ISCONNECTED) == 0) { - error = ENOTCONN; - goto die; - } + return 0; +} + +static int +udp_shutdown(struct socket *so) +{ + int s; + + KASSERT(solocked(so)); + + s = splsoftnet(); + socantsendmore(so); + splx(s); + + return 0; +} + +static int +udp_abort(struct socket *so) +{ + KASSERT(solocked(so)); + + panic("udp_abort"); + + return EOPNOTSUPP; +} + +static int +udp_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp) +{ + return in_control(so, cmd, nam, ifp); +} + +static int +udp_stat(struct socket *so, struct stat *ub) +{ + KASSERT(solocked(so)); + + /* stat: don't bother with a blocksize. */ + return 0; +} + +static int +udp_peeraddr(struct socket *so, struct sockaddr *nam) +{ + int s; + + KASSERT(solocked(so)); + KASSERT(sotoinpcb(so) != NULL); + KASSERT(nam != NULL); + + s = splsoftnet(); + in_setpeeraddr(sotoinpcb(so), (struct sockaddr_in *)nam); + splx(s); + + return 0; +} + +static int +udp_sockaddr(struct socket *so, struct sockaddr *nam) +{ + int s; + + KASSERT(solocked(so)); + KASSERT(sotoinpcb(so) != NULL); + KASSERT(nam != NULL); + + s = splsoftnet(); + in_setsockaddr(sotoinpcb(so), (struct sockaddr_in *)nam); + splx(s); + + return 0; +} + +static int +udp_rcvd(struct socket *so, int flags, struct lwp *l) +{ + KASSERT(solocked(so)); + + return EOPNOTSUPP; +} + +static int +udp_recvoob(struct socket *so, struct mbuf *m, int flags) +{ + KASSERT(solocked(so)); + + return EOPNOTSUPP; +} + +static int +udp_send(struct socket *so, struct mbuf *m, struct sockaddr *nam, + struct mbuf *control, struct lwp *l) +{ + struct inpcb *inp = sotoinpcb(so); + int error = 0; + struct in_addr laddr; /* XXX */ + int s; + + KASSERT(solocked(so)); + KASSERT(inp != NULL); + KASSERT(m != NULL); + + memset(&laddr, 0, sizeof laddr); + + s = splsoftnet(); + if (nam) { + laddr = inp->inp_laddr; /* XXX */ + if ((so->so_state & SS_ISCONNECTED) != 0) { + error = EISCONN; + goto die; } - error = udp_output(m, inp); - if (nam) { - in_pcbdisconnect(inp); - inp->inp_laddr = laddr; /* XXX */ - in_pcbstate(inp, INP_BOUND); /* XXX */ + error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l); + if (error) + goto die; + } else { + if ((so->so_state & SS_ISCONNECTED) == 0) { + error = ENOTCONN; + goto die; } } - break; - - case PRU_SENSE: - /* - * stat: don't bother with a blocksize. - */ - splx(s); - return (0); + error = udp_output(m, inp, control, l); + m = NULL; + control = NULL; + if (nam) { + in_pcbdisconnect(inp); + inp->inp_laddr = laddr; /* XXX */ + in_pcbstate(inp, INP_BOUND); /* XXX */ + } + die: + if (m != NULL) + m_freem(m); + if (control != NULL) + m_freem(control); - case PRU_RCVOOB: - error = EOPNOTSUPP; - break; + splx(s); + return error; +} - case PRU_SENDOOB: - m_freem(control); - m_freem(m); - error = EOPNOTSUPP; - break; +static int +udp_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control) +{ + KASSERT(solocked(so)); - case PRU_SOCKADDR: - in_setsockaddr(inp, nam); - break; + m_freem(m); + m_freem(control); - case PRU_PEERADDR: - in_setpeeraddr(inp, nam); - break; + return EOPNOTSUPP; +} - default: - panic("udp_usrreq"); - } +static int +udp_purgeif(struct socket *so, struct ifnet *ifp) +{ + int s; -release: + s = splsoftnet(); + mutex_enter(softnet_lock); + in_pcbpurgeif0(&udbtable, ifp); +#ifdef NET_MPSAFE + mutex_exit(softnet_lock); +#endif + in_purgeif(ifp); +#ifdef NET_MPSAFE + mutex_enter(softnet_lock); +#endif + in_pcbpurgeif(&udbtable, ifp); + mutex_exit(softnet_lock); splx(s); - return (error); + + return 0; +} + +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)); - 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); +static void +sysctl_net_inet_udp_setup(struct sysctllog **clog) +{ + + 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) +/* + * Handle ESP-in-UDP packets (RFC3948). + * + * We need to distinguish between ESP packets and IKE packets. We do so by + * looking at the Non-ESP and Non-IKE markers. + * + * If IKE, we process the UDP packet as usual. Otherwise, ESP, we invoke + * IPsec. + * + * Returns: + * 1 if the packet was processed + * 0 if normal UDP processing should take place + * -1 if an error occurred and m was freed + */ +static int +udp4_espinudp(struct mbuf **mp, int off, struct socket *so) +{ + size_t len; + uint8_t *data; + struct inpcb *inp; + size_t skip = 0; + size_t minlen; + size_t iphdrlen; + struct ip *ip; + 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 + max(Non-ESP, Non-IKE) + ESP. + */ + minlen = off + 2 * sizeof(uint32_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) { + return -1; + } + m = *mp; } - /* NOTREACHED */ + + len = m->m_len - off; + data = mtod(m, uint8_t *) + off; + inp = sotoinpcb(so); + + /* Ignore keepalive packets. */ + if ((len == 1) && (*data == 0xff)) { + m_freem(m); + *mp = NULL; /* avoid any further processing by caller */ + return 1; + } + + /* Handle Non-ESP marker (32bit). If zero, then IKE. */ + if (inp->inp_flags & INP_ESPINUDP) { + uint32_t *marker = (uint32_t *)data; + + if (len <= sizeof(uint32_t)) + return 0; + if (marker[0] == 0) + return 0; + + skip = sizeof(struct udphdr); + } + + /* Handle Non-IKE marker (64bit). If non-zero, then IKE. */ + if (inp->inp_flags & INP_ESPINUDP_NON_IKE) { + uint32_t *marker = (uint32_t *)data; + + if (len <= 2 * sizeof(uint32_t) + sizeof(struct esp)) + return 0; + if (marker[0] != 0 || marker[1] != 0) + return 0; + + skip = sizeof(struct udphdr) + 2 * sizeof(uint32_t); + } + + /* + * Get the UDP ports. They are handled in network order + * everywhere in the IPSEC_NAT_T code. + */ + udphdr = (struct udphdr *)((char *)data - skip); + sport = udphdr->uh_sport; + dport = udphdr->uh_dport; + + /* + * Remove the UDP header, plus a possible marker. IP header + * length 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_PORTS 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) { + m_freem(m); + return -1; + } + ((u_int16_t *)(tag + 1))[0] = sport; + ((u_int16_t *)(tag + 1))[1] = dport; + m_tag_prepend(m, tag); + + if (ipsec_used) + ipsec4_common_input(m, iphdrlen, IPPROTO_ESP); + else + m_freem(m); + + /* We handled it, it shouldn't be handled by UDP */ + *mp = NULL; /* avoid free by caller ... */ + return 1; } #endif + +PR_WRAP_USRREQS(udp) +#define udp_attach udp_attach_wrapper +#define udp_detach udp_detach_wrapper +#define udp_accept udp_accept_wrapper +#define udp_bind udp_bind_wrapper +#define udp_listen udp_listen_wrapper +#define udp_connect udp_connect_wrapper +#define udp_connect2 udp_connect2_wrapper +#define udp_disconnect udp_disconnect_wrapper +#define udp_shutdown udp_shutdown_wrapper +#define udp_abort udp_abort_wrapper +#define udp_ioctl udp_ioctl_wrapper +#define udp_stat udp_stat_wrapper +#define udp_peeraddr udp_peeraddr_wrapper +#define udp_sockaddr udp_sockaddr_wrapper +#define udp_rcvd udp_rcvd_wrapper +#define udp_recvoob udp_recvoob_wrapper +#define udp_send udp_send_wrapper +#define udp_sendoob udp_sendoob_wrapper +#define udp_purgeif udp_purgeif_wrapper + +const struct pr_usrreqs udp_usrreqs = { + .pr_attach = udp_attach, + .pr_detach = udp_detach, + .pr_accept = udp_accept, + .pr_bind = udp_bind, + .pr_listen = udp_listen, + .pr_connect = udp_connect, + .pr_connect2 = udp_connect2, + .pr_disconnect = udp_disconnect, + .pr_shutdown = udp_shutdown, + .pr_abort = udp_abort, + .pr_ioctl = udp_ioctl, + .pr_stat = udp_stat, + .pr_peeraddr = udp_peeraddr, + .pr_sockaddr = udp_sockaddr, + .pr_rcvd = udp_rcvd, + .pr_recvoob = udp_recvoob, + .pr_send = udp_send, + .pr_sendoob = udp_sendoob, + .pr_purgeif = udp_purgeif, +};