/* $NetBSD: udp6_usrreq.c,v 1.77 2007/03/04 06:03:28 christos Exp $ */ /* $KAME: udp6_usrreq.c,v 1.86 2001/05/27 17:33:00 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * Copyright (c) 1982, 1986, 1989, 1993 * The Regents of the University of California. 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 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_var.h 8.1 (Berkeley) 6/10/93 */ #include __KERNEL_RCSID(0, "$NetBSD: udp6_usrreq.c,v 1.77 2007/03/04 06:03:28 christos Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "faith.h" #if defined(NFAITH) && NFAITH > 0 #include #endif /* * UDP protocol implementation. * Per RFC 768, August, 1980. */ extern struct inpcbtable udbtable; struct udp6stat udp6stat; static void udp6_notify __P((struct in6pcb *, int)); void udp6_init() { /* initialization done in udp_input() due to initialization order */ } /* * Notify a udp user of an asynchronous error; * just wake up so that he can collect error status. */ static void udp6_notify(struct in6pcb *in6p, int errno) { in6p->in6p_socket->so_error = errno; sorwakeup(in6p->in6p_socket); sowwakeup(in6p->in6p_socket); } void udp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) { struct udphdr uh; struct ip6_hdr *ip6; const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; struct mbuf *m; int off; void *cmdarg; struct ip6ctlparam *ip6cp = NULL; const struct sockaddr_in6 *sa6_src = NULL; void (*notify)(struct in6pcb *, int) = udp6_notify; struct udp_portonly { u_int16_t uh_sport; u_int16_t uh_dport; } *uhp; if (sa->sa_family != AF_INET6 || sa->sa_len != sizeof(struct sockaddr_in6)) return; if ((unsigned)cmd >= PRC_NCMDS) return; if (PRC_IS_REDIRECT(cmd)) notify = in6_rtchange, d = NULL; else if (cmd == PRC_HOSTDEAD) d = NULL; else if (cmd == PRC_MSGSIZE) { /* special code is present, see below */ notify = in6_rtchange; } else if (inet6ctlerrmap[cmd] == 0) return; /* if the parameter is from icmp6, decode it. */ if (d != NULL) { ip6cp = (struct ip6ctlparam *)d; m = ip6cp->ip6c_m; ip6 = ip6cp->ip6c_ip6; off = ip6cp->ip6c_off; cmdarg = ip6cp->ip6c_cmdarg; sa6_src = ip6cp->ip6c_src; } else { m = NULL; ip6 = NULL; cmdarg = NULL; sa6_src = &sa6_any; off = 0; } if (ip6) { /* * XXX: We assume that when IPV6 is non NULL, * M and OFF are valid. */ /* check if we can safely examine src and dst ports */ if (m->m_pkthdr.len < off + sizeof(*uhp)) { if (cmd == PRC_MSGSIZE) icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); return; } bzero(&uh, sizeof(uh)); m_copydata(m, off, sizeof(*uhp), (void *)&uh); if (cmd == PRC_MSGSIZE) { int valid = 0; /* * Check to see if we have a valid UDP socket * corresponding to the address in the ICMPv6 message * payload. */ if (in6_pcblookup_connect(&udbtable, &sa6->sin6_addr, uh.uh_dport, (const struct in6_addr *)&sa6_src->sin6_addr, uh.uh_sport, 0)) valid++; #if 0 /* * As the use of sendto(2) is fairly popular, * we may want to allow non-connected pcb too. * But it could be too weak against attacks... * We should at least check if the local address (= s) * is really ours. */ else if (in6_pcblookup_bind(&udbtable, &sa6->sin6_addr, uh.uh_dport, 0)) valid++; #endif /* * Depending on the value of "valid" and routing table * size (mtudisc_{hi,lo}wat), we will: * - recalculate the new MTU and create the * corresponding routing entry, or * - ignore the MTU change notification. */ icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); /* * regardless of if we called * icmp6_mtudisc_update(), we need to call * in6_pcbnotify(), to notify path MTU change * to the userland (RFC3542), because some * unconnected sockets may share the same * destination and want to know the path MTU. */ } (void) in6_pcbnotify(&udbtable, sa, uh.uh_dport, (const struct sockaddr *)sa6_src, uh.uh_sport, cmd, cmdarg, notify); } else { (void) in6_pcbnotify(&udbtable, sa, 0, (const struct sockaddr *)sa6_src, 0, cmd, cmdarg, notify); } } extern int udp6_sendspace; extern int udp6_recvspace; int udp6_usrreq(struct socket *so, int req, struct mbuf *m, struct mbuf *addr6, struct mbuf *control, struct lwp *l) { struct in6pcb *in6p = sotoin6pcb(so); int error = 0; int s; /* * MAPPED_ADDR implementation info: * Mapped addr support for PRU_CONTROL is not necessary. * Because typical user of PRU_CONTROL is such as ifconfig, * and they don't associate any addr to their socket. Then * socket family is only hint about the PRU_CONTROL'ed address * family, especially when getting addrs from kernel. * So AF_INET socket need to be used to control AF_INET addrs, * and AF_INET6 socket for AF_INET6 addrs. */ if (req == PRU_CONTROL) return (in6_control(so, (u_long)m, (void *)addr6, (struct ifnet *)control, l)); if (req == PRU_PURGEIF) { in6_pcbpurgeif0(&udbtable, (struct ifnet *)control); in6_purgeif((struct ifnet *)control); in6_pcbpurgeif(&udbtable, (struct ifnet *)control); return (0); } if (in6p == NULL && req != PRU_ATTACH) { error = EINVAL; goto release; } switch (req) { case PRU_ATTACH: /* * MAPPED_ADDR implementation spec: * Always attach for IPv6, * and only when necessary for IPv4. */ if (in6p != NULL) { error = EINVAL; break; } s = splsoftnet(); error = in6_pcballoc(so, &udbtable); splx(s); if (error) break; error = soreserve(so, udp6_sendspace, udp6_recvspace); if (error) break; in6p = sotoin6pcb(so); in6p->in6p_cksum = -1; /* just to be sure */ break; case PRU_DETACH: in6_pcbdetach(in6p); break; case PRU_BIND: s = splsoftnet(); error = in6_pcbbind(in6p, addr6, l); splx(s); break; case PRU_LISTEN: error = EOPNOTSUPP; break; case PRU_CONNECT: if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { error = EISCONN; break; } s = splsoftnet(); error = in6_pcbconnect(in6p, addr6, l); splx(s); if (error == 0) soisconnected(so); break; case PRU_CONNECT2: error = EOPNOTSUPP; break; case PRU_ACCEPT: error = EOPNOTSUPP; break; case PRU_DISCONNECT: if (IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) { error = ENOTCONN; break; } s = splsoftnet(); in6_pcbdisconnect(in6p); bzero((void *)&in6p->in6p_laddr, sizeof(in6p->in6p_laddr)); splx(s); so->so_state &= ~SS_ISCONNECTED; /* XXX */ in6_pcbstate(in6p, IN6P_BOUND); /* XXX */ break; case PRU_SHUTDOWN: socantsendmore(so); break; case PRU_SEND: return (udp6_output(in6p, m, addr6, control, l)); case PRU_ABORT: soisdisconnected(so); in6_pcbdetach(in6p); break; case PRU_SOCKADDR: in6_setsockaddr(in6p, addr6); break; case PRU_PEERADDR: in6_setpeeraddr(in6p, addr6); break; case PRU_SENSE: /* * stat: don't bother with a blocksize */ return (0); case PRU_SENDOOB: case PRU_FASTTIMO: case PRU_SLOWTIMO: case PRU_PROTORCV: case PRU_PROTOSEND: error = EOPNOTSUPP; break; case PRU_RCVD: case PRU_RCVOOB: return (EOPNOTSUPP); /* do not free mbuf's */ default: panic("udp6_usrreq"); } release: if (control) m_freem(control); if (m) m_freem(m); return (error); } SYSCTL_SETUP(sysctl_net_inet6_udp6_setup, "sysctl net.inet6.udp6 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, "inet6", NULL, NULL, 0, NULL, 0, CTL_NET, PF_INET6, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "udp6", SYSCTL_DESCR("UDPv6 related settings"), NULL, 0, NULL, 0, CTL_NET, PF_INET6, IPPROTO_UDP, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "sendspace", SYSCTL_DESCR("Default UDP send buffer size"), NULL, 0, &udp6_sendspace, 0, CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_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, &udp6_recvspace, 0, CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_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_INET6, IPPROTO_UDP, UDP6CTL_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_INET6, IPPROTO_UDP, CTL_CREATE, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_STRUCT, "stats", SYSCTL_DESCR("UDPv6 statistics"), NULL, 0, &udp6stat, sizeof(udp6stat), CTL_NET, PF_INET6, IPPROTO_UDP, UDP6CTL_STATS, CTL_EOL); }