diff options
Diffstat (limited to 'sys/netinet/udp_usrreq.c')
| -rw-r--r-- | sys/netinet/udp_usrreq.c | 1625 |
1 files changed, 1625 insertions, 0 deletions
diff --git a/sys/netinet/udp_usrreq.c b/sys/netinet/udp_usrreq.c new file mode 100644 index 0000000..b6297dc --- /dev/null +++ b/sys/netinet/udp_usrreq.c @@ -0,0 +1,1625 @@ +/*- + * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 + * The Regents of the University of California. + * Copyright (c) 2008 Robert N. M. Watson + * Copyright (c) 2010-2011 Juniper Networks, Inc. + * All rights reserved. + * + * Portions of this software were developed by Robert N. M. Watson under + * contract to Juniper Networks, Inc. + * + * 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. + * 4. 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. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. + * + * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_ipfw.h" +#include "opt_inet.h" +#include "opt_inet6.h" +#include "opt_ipsec.h" + +#include <sys/param.h> +#include <sys/domain.h> +#include <sys/eventhandler.h> +#include <sys/jail.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/priv.h> +#include <sys/proc.h> +#include <sys/protosw.h> +#include <sys/signalvar.h> +#include <sys/socket.h> +#include <sys/socketvar.h> +#include <sys/sx.h> +#include <sys/sysctl.h> +#include <sys/syslog.h> +#include <sys/systm.h> + +#include <vm/uma.h> + +#include <net/if.h> +#include <net/route.h> + +#include <netinet/in.h> +#include <netinet/in_pcb.h> +#include <netinet/in_systm.h> +#include <netinet/in_var.h> +#include <netinet/ip.h> +#ifdef INET6 +#include <netinet/ip6.h> +#endif +#include <netinet/ip_icmp.h> +#include <netinet/icmp_var.h> +#include <netinet/ip_var.h> +#include <netinet/ip_options.h> +#ifdef INET6 +#include <netinet6/ip6_var.h> +#endif +#include <netinet/udp.h> +#include <netinet/udp_var.h> + +#ifdef IPSEC +#include <netipsec/ipsec.h> +#include <netipsec/esp.h> +#endif + +#include <machine/in_cksum.h> + +#include <security/mac/mac_framework.h> + +/* + * UDP protocol implementation. + * Per RFC 768, August, 1980. + */ + +/* + * BSD 4.2 defaulted the udp checksum to be off. Turning off udp checksums + * removes the only data integrity mechanism for packets and malformed + * packets that would otherwise be discarded due to bad checksums, and may + * cause problems (especially for NFS data blocks). + */ +VNET_DEFINE(int, udp_cksum) = 1; +SYSCTL_VNET_INT(_net_inet_udp, UDPCTL_CHECKSUM, checksum, CTLFLAG_RW, + &VNET_NAME(udp_cksum), 0, "compute udp checksum"); + +int udp_log_in_vain = 0; +SYSCTL_INT(_net_inet_udp, OID_AUTO, log_in_vain, CTLFLAG_RW, + &udp_log_in_vain, 0, "Log all incoming UDP packets"); + +VNET_DEFINE(int, udp_blackhole) = 0; +SYSCTL_VNET_INT(_net_inet_udp, OID_AUTO, blackhole, CTLFLAG_RW, + &VNET_NAME(udp_blackhole), 0, + "Do not send port unreachables for refused connects"); + +u_long udp_sendspace = 9216; /* really max datagram size */ + /* 40 1K datagrams */ +SYSCTL_ULONG(_net_inet_udp, UDPCTL_MAXDGRAM, maxdgram, CTLFLAG_RW, + &udp_sendspace, 0, "Maximum outgoing UDP datagram size"); + +u_long udp_recvspace = 40 * (1024 + +#ifdef INET6 + sizeof(struct sockaddr_in6) +#else + sizeof(struct sockaddr_in) +#endif + ); + +SYSCTL_ULONG(_net_inet_udp, UDPCTL_RECVSPACE, recvspace, CTLFLAG_RW, + &udp_recvspace, 0, "Maximum space for incoming UDP datagrams"); + +VNET_DEFINE(struct inpcbhead, udb); /* from udp_var.h */ +VNET_DEFINE(struct inpcbinfo, udbinfo); +static VNET_DEFINE(uma_zone_t, udpcb_zone); +#define V_udpcb_zone VNET(udpcb_zone) + +#ifndef UDBHASHSIZE +#define UDBHASHSIZE 128 +#endif + +VNET_DEFINE(struct udpstat, udpstat); /* from udp_var.h */ +SYSCTL_VNET_STRUCT(_net_inet_udp, UDPCTL_STATS, stats, CTLFLAG_RW, + &VNET_NAME(udpstat), udpstat, + "UDP statistics (struct udpstat, netinet/udp_var.h)"); + +#ifdef INET +static void udp_detach(struct socket *so); +static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, + struct mbuf *, struct thread *); +#endif + +#ifdef IPSEC +#ifdef IPSEC_NAT_T +#define UF_ESPINUDP_ALL (UF_ESPINUDP_NON_IKE|UF_ESPINUDP) +#ifdef INET +static struct mbuf *udp4_espdecap(struct inpcb *, struct mbuf *, int); +#endif +#endif /* IPSEC_NAT_T */ +#endif /* IPSEC */ + +static void +udp_zone_change(void *tag) +{ + + uma_zone_set_max(V_udbinfo.ipi_zone, maxsockets); + uma_zone_set_max(V_udpcb_zone, maxsockets); +} + +static int +udp_inpcb_init(void *mem, int size, int flags) +{ + struct inpcb *inp; + + inp = mem; + INP_LOCK_INIT(inp, "inp", "udpinp"); + return (0); +} + +void +udp_init(void) +{ + + in_pcbinfo_init(&V_udbinfo, "udp", &V_udb, UDBHASHSIZE, UDBHASHSIZE, + "udp_inpcb", udp_inpcb_init, NULL, UMA_ZONE_NOFREE, + IPI_HASHFIELDS_2TUPLE); + V_udpcb_zone = uma_zcreate("udpcb", sizeof(struct udpcb), + NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE); + uma_zone_set_max(V_udpcb_zone, maxsockets); + uma_zone_set_warning(V_udpcb_zone, "kern.ipc.maxsockets limit reached"); + EVENTHANDLER_REGISTER(maxsockets_change, udp_zone_change, NULL, + EVENTHANDLER_PRI_ANY); +} + +/* + * Kernel module interface for updating udpstat. The argument is an index + * into udpstat treated as an array of u_long. While this encodes the + * general layout of udpstat into the caller, it doesn't encode its location, + * so that future changes to add, for example, per-CPU stats support won't + * cause binary compatibility problems for kernel modules. + */ +void +kmod_udpstat_inc(int statnum) +{ + + (*((u_long *)&V_udpstat + statnum))++; +} + +int +udp_newudpcb(struct inpcb *inp) +{ + struct udpcb *up; + + up = uma_zalloc(V_udpcb_zone, M_NOWAIT | M_ZERO); + if (up == NULL) + return (ENOBUFS); + inp->inp_ppcb = up; + return (0); +} + +void +udp_discardcb(struct udpcb *up) +{ + + uma_zfree(V_udpcb_zone, up); +} + +#ifdef VIMAGE +void +udp_destroy(void) +{ + + in_pcbinfo_destroy(&V_udbinfo); + uma_zdestroy(V_udpcb_zone); +} +#endif + +#ifdef INET +/* + * Subroutine of udp_input(), which appends the provided mbuf chain to the + * passed pcb/socket. The caller must provide a sockaddr_in via udp_in that + * contains the source address. If the socket ends up being an IPv6 socket, + * udp_append() will convert to a sockaddr_in6 before passing the address + * into the socket code. + */ +static void +udp_append(struct inpcb *inp, struct ip *ip, struct mbuf *n, int off, + struct sockaddr_in *udp_in) +{ + struct sockaddr *append_sa; + struct socket *so; + struct mbuf *opts = 0; +#ifdef INET6 + struct sockaddr_in6 udp_in6; +#endif + struct udpcb *up; + + INP_LOCK_ASSERT(inp); + + /* + * Engage the tunneling protocol. + */ + up = intoudpcb(inp); + if (up->u_tun_func != NULL) { + (*up->u_tun_func)(n, off, inp); + return; + } + + if (n == NULL) + return; + + off += sizeof(struct udphdr); + +#ifdef IPSEC + /* Check AH/ESP integrity. */ + if (ipsec4_in_reject(n, inp)) { + m_freem(n); + V_ipsec4stat.in_polvio++; + return; + } +#ifdef IPSEC_NAT_T + up = intoudpcb(inp); + KASSERT(up != NULL, ("%s: udpcb NULL", __func__)); + if (up->u_flags & UF_ESPINUDP_ALL) { /* IPSec UDP encaps. */ + n = udp4_espdecap(inp, n, off); + if (n == NULL) /* Consumed. */ + return; + } +#endif /* IPSEC_NAT_T */ +#endif /* IPSEC */ +#ifdef MAC + if (mac_inpcb_check_deliver(inp, n) != 0) { + m_freem(n); + return; + } +#endif /* MAC */ + if (inp->inp_flags & INP_CONTROLOPTS || + inp->inp_socket->so_options & (SO_TIMESTAMP | SO_BINTIME)) { +#ifdef INET6 + if (inp->inp_vflag & INP_IPV6) + (void)ip6_savecontrol_v4(inp, n, &opts, NULL); + else +#endif /* INET6 */ + ip_savecontrol(inp, &opts, ip, n); + } +#ifdef INET6 + if (inp->inp_vflag & INP_IPV6) { + bzero(&udp_in6, sizeof(udp_in6)); + udp_in6.sin6_len = sizeof(udp_in6); + udp_in6.sin6_family = AF_INET6; + in6_sin_2_v4mapsin6(udp_in, &udp_in6); + append_sa = (struct sockaddr *)&udp_in6; + } else +#endif /* INET6 */ + append_sa = (struct sockaddr *)udp_in; + m_adj(n, off); + + so = inp->inp_socket; + SOCKBUF_LOCK(&so->so_rcv); + if (sbappendaddr_locked(&so->so_rcv, append_sa, n, opts) == 0) { + SOCKBUF_UNLOCK(&so->so_rcv); + m_freem(n); + if (opts) + m_freem(opts); + UDPSTAT_INC(udps_fullsock); + } else + sorwakeup_locked(so); +} + +void +udp_input(struct mbuf *m, int off) +{ + int iphlen = off; + struct ip *ip; + struct udphdr *uh; + struct ifnet *ifp; + struct inpcb *inp; + uint16_t len, ip_len; + struct ip save_ip; + struct sockaddr_in udp_in; + struct m_tag *fwd_tag; + + ifp = m->m_pkthdr.rcvif; + UDPSTAT_INC(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); + iphlen = sizeof(struct ip); + } + + /* + * Get IP and UDP header together in first mbuf. + */ + ip = mtod(m, struct ip *); + if (m->m_len < iphlen + sizeof(struct udphdr)) { + if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) { + UDPSTAT_INC(udps_hdrops); + return; + } + ip = mtod(m, struct ip *); + } + uh = (struct udphdr *)((caddr_t)ip + iphlen); + + /* + * Destination port of 0 is illegal, based on RFC768. + */ + if (uh->uh_dport == 0) + goto badunlocked; + + /* + * Construct sockaddr format source address. Stuff source address + * and datagram in user buffer. + */ + bzero(&udp_in, sizeof(udp_in)); + udp_in.sin_len = sizeof(udp_in); + udp_in.sin_family = AF_INET; + udp_in.sin_port = uh->uh_sport; + udp_in.sin_addr = ip->ip_src; + + /* + * Make mbuf data length reflect UDP length. If not enough data to + * reflect UDP length, drop. + */ + len = ntohs((u_short)uh->uh_ulen); + ip_len = ntohs(ip->ip_len) - iphlen; + if (ip_len != len) { + if (len > ip_len || len < sizeof(struct udphdr)) { + UDPSTAT_INC(udps_badlen); + goto badunlocked; + } + m_adj(m, len - ip_len); + } + + /* + * Save a copy of the IP header in case we want restore it for + * sending an ICMP error message in response. + */ + if (!V_udp_blackhole) + save_ip = *ip; + else + memset(&save_ip, 0, sizeof(save_ip)); + + /* + * Checksum extended UDP header and data. + */ + if (uh->uh_sum) { + u_short uh_sum; + + if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { + if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) + uh_sum = m->m_pkthdr.csum_data; + else + uh_sum = in_pseudo(ip->ip_src.s_addr, + ip->ip_dst.s_addr, htonl((u_short)len + + m->m_pkthdr.csum_data + IPPROTO_UDP)); + uh_sum ^= 0xffff; + } else { + char b[9]; + + bcopy(((struct ipovly *)ip)->ih_x1, b, 9); + bzero(((struct ipovly *)ip)->ih_x1, 9); + ((struct ipovly *)ip)->ih_len = uh->uh_ulen; + uh_sum = in_cksum(m, len + sizeof (struct ip)); + bcopy(b, ((struct ipovly *)ip)->ih_x1, 9); + } + if (uh_sum) { + UDPSTAT_INC(udps_badsum); + m_freem(m); + return; + } + } else + UDPSTAT_INC(udps_nosum); + + if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) || + in_broadcast(ip->ip_dst, ifp)) { + struct inpcb *last; + struct ip_moptions *imo; + + INP_INFO_RLOCK(&V_udbinfo); + last = NULL; + LIST_FOREACH(inp, &V_udb, inp_list) { + if (inp->inp_lport != uh->uh_dport) + continue; +#ifdef INET6 + if ((inp->inp_vflag & INP_IPV4) == 0) + continue; +#endif + if (inp->inp_laddr.s_addr != INADDR_ANY && + inp->inp_laddr.s_addr != ip->ip_dst.s_addr) + continue; + if (inp->inp_faddr.s_addr != INADDR_ANY && + inp->inp_faddr.s_addr != ip->ip_src.s_addr) + continue; + if (inp->inp_fport != 0 && + inp->inp_fport != uh->uh_sport) + continue; + + INP_RLOCK(inp); + + /* + * XXXRW: Because we weren't holding either the inpcb + * or the hash lock when we checked for a match + * before, we should probably recheck now that the + * inpcb lock is held. + */ + + /* + * Handle socket delivery policy for any-source + * and source-specific multicast. [RFC3678] + */ + imo = inp->inp_moptions; + if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) { + struct sockaddr_in group; + int blocked; + if (imo == NULL) { + INP_RUNLOCK(inp); + continue; + } + bzero(&group, sizeof(struct sockaddr_in)); + group.sin_len = sizeof(struct sockaddr_in); + group.sin_family = AF_INET; + group.sin_addr = ip->ip_dst; + + blocked = imo_multi_filter(imo, ifp, + (struct sockaddr *)&group, + (struct sockaddr *)&udp_in); + if (blocked != MCAST_PASS) { + if (blocked == MCAST_NOTGMEMBER) + IPSTAT_INC(ips_notmember); + if (blocked == MCAST_NOTSMEMBER || + blocked == MCAST_MUTED) + UDPSTAT_INC(udps_filtermcast); + INP_RUNLOCK(inp); + continue; + } + } + if (last != NULL) { + struct mbuf *n; + + n = m_copy(m, 0, M_COPYALL); + udp_append(last, ip, n, iphlen, &udp_in); + INP_RUNLOCK(last); + } + last = inp; + /* + * Don't look for additional matches if this one does + * not have either the SO_REUSEPORT or SO_REUSEADDR + * socket options set. This heuristic avoids + * searching through all pcbs in the common case of a + * non-shared port. It assumes that an application + * will never clear these options after setting them. + */ + if ((last->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_INC(udps_noportbcast); + if (inp) + INP_RUNLOCK(inp); + INP_INFO_RUNLOCK(&V_udbinfo); + goto badunlocked; + } + udp_append(last, ip, m, iphlen, &udp_in); + INP_RUNLOCK(last); + INP_INFO_RUNLOCK(&V_udbinfo); + return; + } + + /* + * Locate pcb for datagram. + */ + + /* + * Grab info from PACKET_TAG_IPFORWARD tag prepended to the chain. + */ + if ((m->m_flags & M_IP_NEXTHOP) && + (fwd_tag = m_tag_find(m, PACKET_TAG_IPFORWARD, NULL)) != NULL) { + struct sockaddr_in *next_hop; + + next_hop = (struct sockaddr_in *)(fwd_tag + 1); + + /* + * Transparently forwarded. Pretend to be the destination. + * Already got one like this? + */ + inp = in_pcblookup_mbuf(&V_udbinfo, ip->ip_src, uh->uh_sport, + ip->ip_dst, uh->uh_dport, INPLOOKUP_RLOCKPCB, ifp, m); + if (!inp) { + /* + * It's new. Try to find the ambushing socket. + * Because we've rewritten the destination address, + * any hardware-generated hash is ignored. + */ + inp = in_pcblookup(&V_udbinfo, ip->ip_src, + uh->uh_sport, next_hop->sin_addr, + next_hop->sin_port ? htons(next_hop->sin_port) : + uh->uh_dport, INPLOOKUP_WILDCARD | + INPLOOKUP_RLOCKPCB, ifp); + } + /* Remove the tag from the packet. We don't need it anymore. */ + m_tag_delete(m, fwd_tag); + m->m_flags &= ~M_IP_NEXTHOP; + } else + inp = in_pcblookup_mbuf(&V_udbinfo, ip->ip_src, uh->uh_sport, + ip->ip_dst, uh->uh_dport, INPLOOKUP_WILDCARD | + INPLOOKUP_RLOCKPCB, ifp, m); + if (inp == NULL) { + if (udp_log_in_vain) { + char buf[4*sizeof "123"]; + + strcpy(buf, inet_ntoa(ip->ip_dst)); + log(LOG_INFO, + "Connection attempt to UDP %s:%d from %s:%d\n", + buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), + ntohs(uh->uh_sport)); + } + UDPSTAT_INC(udps_noport); + if (m->m_flags & (M_BCAST | M_MCAST)) { + UDPSTAT_INC(udps_noportbcast); + goto badunlocked; + } + if (V_udp_blackhole) + goto badunlocked; + if (badport_bandlim(BANDLIM_ICMP_UNREACH) < 0) + goto badunlocked; + *ip = save_ip; + icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); + return; + } + + /* + * Check the minimum TTL for socket. + */ + INP_RLOCK_ASSERT(inp); + if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl) { + INP_RUNLOCK(inp); + m_freem(m); + return; + } + udp_append(inp, ip, m, iphlen, &udp_in); + INP_RUNLOCK(inp); + return; + +badunlocked: + m_freem(m); +} +#endif /* INET */ + +/* + * Notify a udp user of an asynchronous error; just wake up so that they can + * collect error status. + */ +struct inpcb * +udp_notify(struct inpcb *inp, int errno) +{ + + /* + * While udp_ctlinput() always calls udp_notify() with a read lock + * when invoking it directly, in_pcbnotifyall() currently uses write + * locks due to sharing code with TCP. For now, accept either a read + * or a write lock, but a read lock is sufficient. + */ + INP_LOCK_ASSERT(inp); + + inp->inp_socket->so_error = errno; + sorwakeup(inp->inp_socket); + sowwakeup(inp->inp_socket); + return (inp); +} + +#ifdef INET +void +udp_ctlinput(int cmd, struct sockaddr *sa, void *vip) +{ + struct ip *ip = vip; + struct udphdr *uh; + struct in_addr faddr; + struct inpcb *inp; + + faddr = ((struct sockaddr_in *)sa)->sin_addr; + if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) + return; + + /* + * Redirects don't need to be handled up here. + */ + if (PRC_IS_REDIRECT(cmd)) + return; + + /* + * Hostdead is ugly because it goes linearly through all PCBs. + * + * XXX: We never get this from ICMP, otherwise it makes an excellent + * DoS attack on machines with many connections. + */ + if (cmd == PRC_HOSTDEAD) + ip = NULL; + else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) + return; + if (ip != NULL) { + uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); + inp = in_pcblookup(&V_udbinfo, faddr, uh->uh_dport, + ip->ip_src, uh->uh_sport, INPLOOKUP_RLOCKPCB, NULL); + if (inp != NULL) { + INP_RLOCK_ASSERT(inp); + if (inp->inp_socket != NULL) { + udp_notify(inp, inetctlerrmap[cmd]); + } + INP_RUNLOCK(inp); + } + } else + in_pcbnotifyall(&V_udbinfo, faddr, inetctlerrmap[cmd], + udp_notify); +} +#endif /* INET */ + +static int +udp_pcblist(SYSCTL_HANDLER_ARGS) +{ + int error, i, n; + struct inpcb *inp, **inp_list; + inp_gen_t gencnt; + struct xinpgen xig; + + /* + * The process of preparing the PCB list is too time-consuming and + * resource-intensive to repeat twice on every request. + */ + if (req->oldptr == 0) { + n = V_udbinfo.ipi_count; + n += imax(n / 8, 10); + req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb); + return (0); + } + + if (req->newptr != 0) + return (EPERM); + + /* + * OK, now we're committed to doing something. + */ + INP_INFO_RLOCK(&V_udbinfo); + gencnt = V_udbinfo.ipi_gencnt; + n = V_udbinfo.ipi_count; + INP_INFO_RUNLOCK(&V_udbinfo); + + error = sysctl_wire_old_buffer(req, 2 * (sizeof xig) + + n * sizeof(struct xinpcb)); + if (error != 0) + return (error); + + xig.xig_len = sizeof xig; + xig.xig_count = n; + xig.xig_gen = gencnt; + xig.xig_sogen = so_gencnt; + error = SYSCTL_OUT(req, &xig, sizeof xig); + if (error) + return (error); + + inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); + if (inp_list == 0) + return (ENOMEM); + + INP_INFO_RLOCK(&V_udbinfo); + for (inp = LIST_FIRST(V_udbinfo.ipi_listhead), i = 0; inp && i < n; + inp = LIST_NEXT(inp, inp_list)) { + INP_WLOCK(inp); + if (inp->inp_gencnt <= gencnt && + cr_canseeinpcb(req->td->td_ucred, inp) == 0) { + in_pcbref(inp); + inp_list[i++] = inp; + } + INP_WUNLOCK(inp); + } + INP_INFO_RUNLOCK(&V_udbinfo); + n = i; + + error = 0; + for (i = 0; i < n; i++) { + inp = inp_list[i]; + INP_RLOCK(inp); + if (inp->inp_gencnt <= gencnt) { + struct xinpcb xi; + + bzero(&xi, sizeof(xi)); + xi.xi_len = sizeof xi; + /* XXX should avoid extra copy */ + bcopy(inp, &xi.xi_inp, sizeof *inp); + if (inp->inp_socket) + sotoxsocket(inp->inp_socket, &xi.xi_socket); + xi.xi_inp.inp_gencnt = inp->inp_gencnt; + INP_RUNLOCK(inp); + error = SYSCTL_OUT(req, &xi, sizeof xi); + } else + INP_RUNLOCK(inp); + } + INP_INFO_WLOCK(&V_udbinfo); + for (i = 0; i < n; i++) { + inp = inp_list[i]; + INP_RLOCK(inp); + if (!in_pcbrele_rlocked(inp)) + INP_RUNLOCK(inp); + } + INP_INFO_WUNLOCK(&V_udbinfo); + + if (!error) { + /* + * Give the user an updated idea of our state. If the + * generation differs from what we told her before, she knows + * that something happened while we were processing this + * request, and it might be necessary to retry. + */ + INP_INFO_RLOCK(&V_udbinfo); + xig.xig_gen = V_udbinfo.ipi_gencnt; + xig.xig_sogen = so_gencnt; + xig.xig_count = V_udbinfo.ipi_count; + INP_INFO_RUNLOCK(&V_udbinfo); + error = SYSCTL_OUT(req, &xig, sizeof xig); + } + free(inp_list, M_TEMP); + return (error); +} + +SYSCTL_PROC(_net_inet_udp, UDPCTL_PCBLIST, pcblist, + CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, + udp_pcblist, "S,xinpcb", "List of active UDP sockets"); + +#ifdef INET +static int +udp_getcred(SYSCTL_HANDLER_ARGS) +{ + struct xucred xuc; + struct sockaddr_in addrs[2]; + struct inpcb *inp; + int error; + + error = priv_check(req->td, PRIV_NETINET_GETCRED); + if (error) + return (error); + error = SYSCTL_IN(req, addrs, sizeof(addrs)); + if (error) + return (error); + inp = in_pcblookup(&V_udbinfo, addrs[1].sin_addr, addrs[1].sin_port, + addrs[0].sin_addr, addrs[0].sin_port, + INPLOOKUP_WILDCARD | INPLOOKUP_RLOCKPCB, NULL); + if (inp != NULL) { + INP_RLOCK_ASSERT(inp); + if (inp->inp_socket == NULL) + error = ENOENT; + if (error == 0) + error = cr_canseeinpcb(req->td->td_ucred, inp); + if (error == 0) + cru2x(inp->inp_cred, &xuc); + INP_RUNLOCK(inp); + } else + error = ENOENT; + if (error == 0) + error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); + return (error); +} + +SYSCTL_PROC(_net_inet_udp, OID_AUTO, getcred, + CTLTYPE_OPAQUE|CTLFLAG_RW|CTLFLAG_PRISON, 0, 0, + udp_getcred, "S,xucred", "Get the xucred of a UDP connection"); +#endif /* INET */ + +int +udp_ctloutput(struct socket *so, struct sockopt *sopt) +{ + int error = 0, optval; + struct inpcb *inp; +#ifdef IPSEC_NAT_T + struct udpcb *up; +#endif + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); + INP_WLOCK(inp); + if (sopt->sopt_level != IPPROTO_UDP) { +#ifdef INET6 + if (INP_CHECK_SOCKAF(so, AF_INET6)) { + INP_WUNLOCK(inp); + error = ip6_ctloutput(so, sopt); + } +#endif +#if defined(INET) && defined(INET6) + else +#endif +#ifdef INET + { + INP_WUNLOCK(inp); + error = ip_ctloutput(so, sopt); + } +#endif + return (error); + } + + switch (sopt->sopt_dir) { + case SOPT_SET: + switch (sopt->sopt_name) { + case UDP_ENCAP: + INP_WUNLOCK(inp); + error = sooptcopyin(sopt, &optval, sizeof optval, + sizeof optval); + if (error) + break; + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("%s: inp == NULL", __func__)); + INP_WLOCK(inp); +#ifdef IPSEC_NAT_T + up = intoudpcb(inp); + KASSERT(up != NULL, ("%s: up == NULL", __func__)); +#endif + switch (optval) { + case 0: + /* Clear all UDP encap. */ +#ifdef IPSEC_NAT_T + up->u_flags &= ~UF_ESPINUDP_ALL; +#endif + break; +#ifdef IPSEC_NAT_T + case UDP_ENCAP_ESPINUDP: + case UDP_ENCAP_ESPINUDP_NON_IKE: + up->u_flags &= ~UF_ESPINUDP_ALL; + if (optval == UDP_ENCAP_ESPINUDP) + up->u_flags |= UF_ESPINUDP; + else if (optval == UDP_ENCAP_ESPINUDP_NON_IKE) + up->u_flags |= UF_ESPINUDP_NON_IKE; + break; +#endif + default: + error = EINVAL; + break; + } + INP_WUNLOCK(inp); + break; + default: + INP_WUNLOCK(inp); + error = ENOPROTOOPT; + break; + } + break; + case SOPT_GET: + switch (sopt->sopt_name) { +#ifdef IPSEC_NAT_T + case UDP_ENCAP: + up = intoudpcb(inp); + KASSERT(up != NULL, ("%s: up == NULL", __func__)); + optval = up->u_flags & UF_ESPINUDP_ALL; + INP_WUNLOCK(inp); + error = sooptcopyout(sopt, &optval, sizeof optval); + break; +#endif + default: + INP_WUNLOCK(inp); + error = ENOPROTOOPT; + break; + } + break; + } + return (error); +} + +#ifdef INET +#define UH_WLOCKED 2 +#define UH_RLOCKED 1 +#define UH_UNLOCKED 0 +static int +udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr, + struct mbuf *control, struct thread *td) +{ + struct udpiphdr *ui; + int len = m->m_pkthdr.len; + struct in_addr faddr, laddr; + struct cmsghdr *cm; + struct sockaddr_in *sin, src; + int error = 0; + int ipflags; + u_short fport, lport; + int unlock_udbinfo; + u_char tos; + + /* + * udp_output() may need to temporarily bind or connect the current + * inpcb. As such, we don't know up front whether we will need the + * pcbinfo lock or not. Do any work to decide what is needed up + * front before acquiring any locks. + */ + if (len + sizeof(struct udpiphdr) > IP_MAXPACKET) { + if (control) + m_freem(control); + m_freem(m); + return (EMSGSIZE); + } + + src.sin_family = 0; + INP_RLOCK(inp); + tos = inp->inp_ip_tos; + if (control != NULL) { + /* + * XXX: Currently, we assume all the optional information is + * stored in a single mbuf. + */ + if (control->m_next) { + INP_RUNLOCK(inp); + m_freem(control); + m_freem(m); + return (EINVAL); + } + for (; control->m_len > 0; + control->m_data += CMSG_ALIGN(cm->cmsg_len), + control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { + cm = mtod(control, struct cmsghdr *); + if (control->m_len < sizeof(*cm) || cm->cmsg_len == 0 + || cm->cmsg_len > control->m_len) { + error = EINVAL; + break; + } + if (cm->cmsg_level != IPPROTO_IP) + continue; + + switch (cm->cmsg_type) { + case IP_SENDSRCADDR: + if (cm->cmsg_len != + CMSG_LEN(sizeof(struct in_addr))) { + error = EINVAL; + break; + } + bzero(&src, sizeof(src)); + src.sin_family = AF_INET; + src.sin_len = sizeof(src); + src.sin_port = inp->inp_lport; + src.sin_addr = + *(struct in_addr *)CMSG_DATA(cm); + break; + + case IP_TOS: + if (cm->cmsg_len != CMSG_LEN(sizeof(u_char))) { + error = EINVAL; + break; + } + tos = *(u_char *)CMSG_DATA(cm); + break; + + default: + error = ENOPROTOOPT; + break; + } + if (error) + break; + } + m_freem(control); + } + if (error) { + INP_RUNLOCK(inp); + m_freem(m); + return (error); + } + + /* + * Depending on whether or not the application has bound or connected + * the socket, we may have to do varying levels of work. The optimal + * case is for a connected UDP socket, as a global lock isn't + * required at all. + * + * In order to decide which we need, we require stability of the + * inpcb binding, which we ensure by acquiring a read lock on the + * inpcb. This doesn't strictly follow the lock order, so we play + * the trylock and retry game; note that we may end up with more + * conservative locks than required the second time around, so later + * assertions have to accept that. Further analysis of the number of + * misses under contention is required. + * + * XXXRW: Check that hash locking update here is correct. + */ + sin = (struct sockaddr_in *)addr; + if (sin != NULL && + (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) { + INP_RUNLOCK(inp); + INP_WLOCK(inp); + INP_HASH_WLOCK(&V_udbinfo); + unlock_udbinfo = UH_WLOCKED; + } else if ((sin != NULL && ( + (sin->sin_addr.s_addr == INADDR_ANY) || + (sin->sin_addr.s_addr == INADDR_BROADCAST) || + (inp->inp_laddr.s_addr == INADDR_ANY) || + (inp->inp_lport == 0))) || + (src.sin_family == AF_INET)) { + INP_HASH_RLOCK(&V_udbinfo); + unlock_udbinfo = UH_RLOCKED; + } else + unlock_udbinfo = UH_UNLOCKED; + + /* + * If the IP_SENDSRCADDR control message was specified, override the + * source address for this datagram. Its use is invalidated if the + * address thus specified is incomplete or clobbers other inpcbs. + */ + laddr = inp->inp_laddr; + lport = inp->inp_lport; + if (src.sin_family == AF_INET) { + INP_HASH_LOCK_ASSERT(&V_udbinfo); + if ((lport == 0) || + (laddr.s_addr == INADDR_ANY && + src.sin_addr.s_addr == INADDR_ANY)) { + error = EINVAL; + goto release; + } + error = in_pcbbind_setup(inp, (struct sockaddr *)&src, + &laddr.s_addr, &lport, td->td_ucred); + if (error) + goto release; + } + + /* + * If a UDP socket has been connected, then a local address/port will + * have been selected and bound. + * + * If a UDP socket has not been connected to, then an explicit + * destination address must be used, in which case a local + * address/port may not have been selected and bound. + */ + if (sin != NULL) { + INP_LOCK_ASSERT(inp); + if (inp->inp_faddr.s_addr != INADDR_ANY) { + error = EISCONN; + goto release; + } + + /* + * Jail may rewrite the destination address, so let it do + * that before we use it. + */ + error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); + if (error) + goto release; + + /* + * If a local address or port hasn't yet been selected, or if + * the destination address needs to be rewritten due to using + * a special INADDR_ constant, invoke in_pcbconnect_setup() + * to do the heavy lifting. Once a port is selected, we + * commit the binding back to the socket; we also commit the + * binding of the address if in jail. + * + * If we already have a valid binding and we're not + * requesting a destination address rewrite, use a fast path. + */ + if (inp->inp_laddr.s_addr == INADDR_ANY || + inp->inp_lport == 0 || + sin->sin_addr.s_addr == INADDR_ANY || + sin->sin_addr.s_addr == INADDR_BROADCAST) { + INP_HASH_LOCK_ASSERT(&V_udbinfo); + error = in_pcbconnect_setup(inp, addr, &laddr.s_addr, + &lport, &faddr.s_addr, &fport, NULL, + td->td_ucred); + if (error) + goto release; + + /* + * XXXRW: Why not commit the port if the address is + * !INADDR_ANY? + */ + /* Commit the local port if newly assigned. */ + if (inp->inp_laddr.s_addr == INADDR_ANY && + inp->inp_lport == 0) { + INP_WLOCK_ASSERT(inp); + INP_HASH_WLOCK_ASSERT(&V_udbinfo); + /* + * Remember addr if jailed, to prevent + * rebinding. + */ + if (prison_flag(td->td_ucred, PR_IP4)) + inp->inp_laddr = laddr; + inp->inp_lport = lport; + if (in_pcbinshash(inp) != 0) { + inp->inp_lport = 0; + error = EAGAIN; + goto release; + } + inp->inp_flags |= INP_ANONPORT; + } + } else { + faddr = sin->sin_addr; + fport = sin->sin_port; + } + } else { + INP_LOCK_ASSERT(inp); + faddr = inp->inp_faddr; + fport = inp->inp_fport; + if (faddr.s_addr == INADDR_ANY) { + error = ENOTCONN; + goto release; + } + } + + /* + * Calculate data length and get a mbuf for UDP, IP, and possible + * link-layer headers. Immediate slide the data pointer back forward + * since we won't use that space at this layer. + */ + M_PREPEND(m, sizeof(struct udpiphdr) + max_linkhdr, M_NOWAIT); + if (m == NULL) { + error = ENOBUFS; + goto release; + } + m->m_data += max_linkhdr; + m->m_len -= max_linkhdr; + m->m_pkthdr.len -= max_linkhdr; + + /* + * 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)); /* XXX still needed? */ + ui->ui_pr = IPPROTO_UDP; + ui->ui_src = laddr; + ui->ui_dst = faddr; + ui->ui_sport = lport; + ui->ui_dport = fport; + ui->ui_ulen = htons((u_short)len + sizeof(struct udphdr)); + + /* + * Set the Don't Fragment bit in the IP header. + */ + if (inp->inp_flags & INP_DONTFRAG) { + struct ip *ip; + + ip = (struct ip *)&ui->ui_i; + ip->ip_off |= htons(IP_DF); + } + + ipflags = 0; + if (inp->inp_socket->so_options & SO_DONTROUTE) + ipflags |= IP_ROUTETOIF; + if (inp->inp_socket->so_options & SO_BROADCAST) + ipflags |= IP_ALLOWBROADCAST; + if (inp->inp_flags & INP_ONESBCAST) + ipflags |= IP_SENDONES; + +#ifdef MAC + mac_inpcb_create_mbuf(inp, m); +#endif + + /* + * Set up checksum and output datagram. + */ + if (V_udp_cksum) { + if (inp->inp_flags & INP_ONESBCAST) + faddr.s_addr = INADDR_BROADCAST; + ui->ui_sum = in_pseudo(ui->ui_src.s_addr, faddr.s_addr, + htons((u_short)len + sizeof(struct udphdr) + IPPROTO_UDP)); + m->m_pkthdr.csum_flags = CSUM_UDP; + 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_ttl; /* XXX */ + ((struct ip *)ui)->ip_tos = tos; /* XXX */ + UDPSTAT_INC(udps_opackets); + + if (unlock_udbinfo == UH_WLOCKED) + INP_HASH_WUNLOCK(&V_udbinfo); + else if (unlock_udbinfo == UH_RLOCKED) + INP_HASH_RUNLOCK(&V_udbinfo); + error = ip_output(m, inp->inp_options, NULL, ipflags, + inp->inp_moptions, inp); + if (unlock_udbinfo == UH_WLOCKED) + INP_WUNLOCK(inp); + else + INP_RUNLOCK(inp); + return (error); + +release: + if (unlock_udbinfo == UH_WLOCKED) { + INP_HASH_WUNLOCK(&V_udbinfo); + INP_WUNLOCK(inp); + } else if (unlock_udbinfo == UH_RLOCKED) { + INP_HASH_RUNLOCK(&V_udbinfo); + INP_RUNLOCK(inp); + } else + INP_RUNLOCK(inp); + m_freem(m); + return (error); +} + + +#if defined(IPSEC) && defined(IPSEC_NAT_T) +/* + * Potentially decap ESP in UDP frame. Check for an ESP header + * and optional marker; if present, strip the UDP header and + * push the result through IPSec. + * + * Returns mbuf to be processed (potentially re-allocated) or + * NULL if consumed and/or processed. + */ +static struct mbuf * +udp4_espdecap(struct inpcb *inp, struct mbuf *m, int off) +{ + size_t minlen, payload, skip, iphlen; + caddr_t data; + struct udpcb *up; + struct m_tag *tag; + struct udphdr *udphdr; + struct ip *ip; + + INP_RLOCK_ASSERT(inp); + + /* + * Pull up data so the longest case is contiguous: + * IP/UDP hdr + non ESP marker + ESP hdr. + */ + minlen = off + sizeof(uint64_t) + sizeof(struct esp); + if (minlen > m->m_pkthdr.len) + minlen = m->m_pkthdr.len; + if ((m = m_pullup(m, minlen)) == NULL) { + V_ipsec4stat.in_inval++; + return (NULL); /* Bypass caller processing. */ + } + data = mtod(m, caddr_t); /* Points to ip header. */ + payload = m->m_len - off; /* Size of payload. */ + + if (payload == 1 && data[off] == '\xff') + return (m); /* NB: keepalive packet, no decap. */ + + up = intoudpcb(inp); + KASSERT(up != NULL, ("%s: udpcb NULL", __func__)); + KASSERT((up->u_flags & UF_ESPINUDP_ALL) != 0, + ("u_flags 0x%x", up->u_flags)); + + /* + * Check that the payload is large enough to hold an + * ESP header and compute the amount of data to remove. + * + * NB: the caller has already done a pullup for us. + * XXX can we assume alignment and eliminate bcopys? + */ + if (up->u_flags & UF_ESPINUDP_NON_IKE) { + /* + * draft-ietf-ipsec-nat-t-ike-0[01].txt and + * draft-ietf-ipsec-udp-encaps-(00/)01.txt, ignoring + * possible AH mode non-IKE marker+non-ESP marker + * from draft-ietf-ipsec-udp-encaps-00.txt. + */ + uint64_t marker; + + if (payload <= sizeof(uint64_t) + sizeof(struct esp)) + return (m); /* NB: no decap. */ + bcopy(data + off, &marker, sizeof(uint64_t)); + if (marker != 0) /* Non-IKE marker. */ + return (m); /* NB: no decap. */ + skip = sizeof(uint64_t) + sizeof(struct udphdr); + } else { + uint32_t spi; + + if (payload <= sizeof(struct esp)) { + V_ipsec4stat.in_inval++; + m_freem(m); + return (NULL); /* Discard. */ + } + bcopy(data + off, &spi, sizeof(uint32_t)); + if (spi == 0) /* Non-ESP marker. */ + return (m); /* NB: no decap. */ + skip = sizeof(struct udphdr); + } + + /* + * Setup a PACKET_TAG_IPSEC_NAT_T_PORT tag to remember + * the UDP ports. This is required if we want to select + * the right SPD for multiple hosts behind same NAT. + * + * NB: ports are maintained in network byte order everywhere + * in the NAT-T code. + */ + tag = m_tag_get(PACKET_TAG_IPSEC_NAT_T_PORTS, + 2 * sizeof(uint16_t), M_NOWAIT); + if (tag == NULL) { + V_ipsec4stat.in_nomem++; + m_freem(m); + return (NULL); /* Discard. */ + } + iphlen = off - sizeof(struct udphdr); + udphdr = (struct udphdr *)(data + iphlen); + ((uint16_t *)(tag + 1))[0] = udphdr->uh_sport; + ((uint16_t *)(tag + 1))[1] = udphdr->uh_dport; + m_tag_prepend(m, tag); + + /* + * Remove the UDP header (and possibly the non ESP marker) + * IP header length is iphlen + * Before: + * <--- off ---> + * +----+------+-----+ + * | IP | UDP | ESP | + * +----+------+-----+ + * <-skip-> + * After: + * +----+-----+ + * | IP | ESP | + * +----+-----+ + * <-skip-> + */ + ovbcopy(data, data + skip, iphlen); + m_adj(m, skip); + + ip = mtod(m, struct ip *); + ip->ip_len = htons(ntohs(ip->ip_len) - skip); + ip->ip_p = IPPROTO_ESP; + + /* + * We cannot yet update the cksums so clear any + * h/w cksum flags as they are no longer valid. + */ + if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) + m->m_pkthdr.csum_flags &= ~(CSUM_DATA_VALID|CSUM_PSEUDO_HDR); + + (void) ipsec4_common_input(m, iphlen, ip->ip_p); + return (NULL); /* NB: consumed, bypass processing. */ +} +#endif /* defined(IPSEC) && defined(IPSEC_NAT_T) */ + +static void +udp_abort(struct socket *so) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("udp_abort: inp == NULL")); + INP_WLOCK(inp); + if (inp->inp_faddr.s_addr != INADDR_ANY) { + INP_HASH_WLOCK(&V_udbinfo); + in_pcbdisconnect(inp); + inp->inp_laddr.s_addr = INADDR_ANY; + INP_HASH_WUNLOCK(&V_udbinfo); + soisdisconnected(so); + } + INP_WUNLOCK(inp); +} + +static int +udp_attach(struct socket *so, int proto, struct thread *td) +{ + struct inpcb *inp; + int error; + + inp = sotoinpcb(so); + KASSERT(inp == NULL, ("udp_attach: inp != NULL")); + error = soreserve(so, udp_sendspace, udp_recvspace); + if (error) + return (error); + INP_INFO_WLOCK(&V_udbinfo); + error = in_pcballoc(so, &V_udbinfo); + if (error) { + INP_INFO_WUNLOCK(&V_udbinfo); + return (error); + } + + inp = sotoinpcb(so); + inp->inp_vflag |= INP_IPV4; + inp->inp_ip_ttl = V_ip_defttl; + + error = udp_newudpcb(inp); + if (error) { + in_pcbdetach(inp); + in_pcbfree(inp); + INP_INFO_WUNLOCK(&V_udbinfo); + return (error); + } + + INP_WUNLOCK(inp); + INP_INFO_WUNLOCK(&V_udbinfo); + return (0); +} +#endif /* INET */ + +int +udp_set_kernel_tunneling(struct socket *so, udp_tun_func_t f) +{ + struct inpcb *inp; + struct udpcb *up; + + KASSERT(so->so_type == SOCK_DGRAM, + ("udp_set_kernel_tunneling: !dgram")); + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("udp_set_kernel_tunneling: inp == NULL")); + INP_WLOCK(inp); + up = intoudpcb(inp); + if (up->u_tun_func != NULL) { + INP_WUNLOCK(inp); + return (EBUSY); + } + up->u_tun_func = f; + INP_WUNLOCK(inp); + return (0); +} + +#ifdef INET +static int +udp_bind(struct socket *so, struct sockaddr *nam, struct thread *td) +{ + struct inpcb *inp; + int error; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("udp_bind: inp == NULL")); + INP_WLOCK(inp); + INP_HASH_WLOCK(&V_udbinfo); + error = in_pcbbind(inp, nam, td->td_ucred); + INP_HASH_WUNLOCK(&V_udbinfo); + INP_WUNLOCK(inp); + return (error); +} + +static void +udp_close(struct socket *so) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("udp_close: inp == NULL")); + INP_WLOCK(inp); + if (inp->inp_faddr.s_addr != INADDR_ANY) { + INP_HASH_WLOCK(&V_udbinfo); + in_pcbdisconnect(inp); + inp->inp_laddr.s_addr = INADDR_ANY; + INP_HASH_WUNLOCK(&V_udbinfo); + soisdisconnected(so); + } + INP_WUNLOCK(inp); +} + +static int +udp_connect(struct socket *so, struct sockaddr *nam, struct thread *td) +{ + struct inpcb *inp; + int error; + struct sockaddr_in *sin; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("udp_connect: inp == NULL")); + INP_WLOCK(inp); + if (inp->inp_faddr.s_addr != INADDR_ANY) { + INP_WUNLOCK(inp); + return (EISCONN); + } + sin = (struct sockaddr_in *)nam; + error = prison_remote_ip4(td->td_ucred, &sin->sin_addr); + if (error != 0) { + INP_WUNLOCK(inp); + return (error); + } + INP_HASH_WLOCK(&V_udbinfo); + error = in_pcbconnect(inp, nam, td->td_ucred); + INP_HASH_WUNLOCK(&V_udbinfo); + if (error == 0) + soisconnected(so); + INP_WUNLOCK(inp); + return (error); +} + +static void +udp_detach(struct socket *so) +{ + struct inpcb *inp; + struct udpcb *up; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("udp_detach: inp == NULL")); + KASSERT(inp->inp_faddr.s_addr == INADDR_ANY, + ("udp_detach: not disconnected")); + INP_INFO_WLOCK(&V_udbinfo); + INP_WLOCK(inp); + up = intoudpcb(inp); + KASSERT(up != NULL, ("%s: up == NULL", __func__)); + inp->inp_ppcb = NULL; + in_pcbdetach(inp); + in_pcbfree(inp); + INP_INFO_WUNLOCK(&V_udbinfo); + udp_discardcb(up); +} + +static int +udp_disconnect(struct socket *so) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("udp_disconnect: inp == NULL")); + INP_WLOCK(inp); + if (inp->inp_faddr.s_addr == INADDR_ANY) { + INP_WUNLOCK(inp); + return (ENOTCONN); + } + INP_HASH_WLOCK(&V_udbinfo); + in_pcbdisconnect(inp); + inp->inp_laddr.s_addr = INADDR_ANY; + INP_HASH_WUNLOCK(&V_udbinfo); + SOCK_LOCK(so); + so->so_state &= ~SS_ISCONNECTED; /* XXX */ + SOCK_UNLOCK(so); + INP_WUNLOCK(inp); + return (0); +} + +static int +udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, + struct mbuf *control, struct thread *td) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("udp_send: inp == NULL")); + return (udp_output(inp, m, addr, control, td)); +} +#endif /* INET */ + +int +udp_shutdown(struct socket *so) +{ + struct inpcb *inp; + + inp = sotoinpcb(so); + KASSERT(inp != NULL, ("udp_shutdown: inp == NULL")); + INP_WLOCK(inp); + socantsendmore(so); + INP_WUNLOCK(inp); + return (0); +} + +#ifdef INET +struct pr_usrreqs udp_usrreqs = { + .pru_abort = udp_abort, + .pru_attach = udp_attach, + .pru_bind = udp_bind, + .pru_connect = udp_connect, + .pru_control = in_control, + .pru_detach = udp_detach, + .pru_disconnect = udp_disconnect, + .pru_peeraddr = in_getpeeraddr, + .pru_send = udp_send, + .pru_soreceive = soreceive_dgram, + .pru_sosend = sosend_dgram, + .pru_shutdown = udp_shutdown, + .pru_sockaddr = in_getsockaddr, + .pru_sosetlabel = in_pcbsosetlabel, + .pru_close = udp_close, +}; +#endif /* INET */ |
