/* * 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. * * $FreeBSD: src/sys/netinet6/raw_ip6.c,v 1.7.2.7 2003/01/24 05:11:35 sam Exp $ */ /* * Copyright (c) 1982, 1986, 1988, 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. * * @(#)raw_ip.c 8.2 (Berkeley) 1/4/94 */ #include "opt_inet6.h" #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 #ifdef ENABLE_DEFAULT_SCOPE #include #endif #include #include #define satosin6(sa) ((struct sockaddr_in6 *)(sa)) #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) /* * Raw interface to IP6 protocol. */ extern struct inpcbinfo ripcbinfo; extern u_long rip_sendspace; extern u_long rip_recvspace; struct rip6stat rip6stat; /* * Setup generic address and protocol structures * for raw_input routine, then pass them along with * mbuf chain. */ int rip6_input(struct mbuf **mp, int *offp, int proto) { struct mbuf *m = *mp; struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); struct inpcb *in6p; struct inpcb *last = NULL; struct mbuf *opts = NULL; struct sockaddr_in6 rip6src; rip6stat.rip6s_ipackets++; init_sin6(&rip6src, m); /* general init */ LIST_FOREACH(in6p, &ripcbinfo.pcblisthead, inp_list) { if (in6p->in6p_flags & INP_PLACEMARKER) continue; if (!INP_ISIPV6(in6p)) continue; if (in6p->in6p_ip6_nxt && in6p->in6p_ip6_nxt != proto) continue; if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr) && !IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr, &ip6->ip6_dst)) continue; if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) && !IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr, &ip6->ip6_src)) continue; if (in6p->in6p_cksum != -1) { rip6stat.rip6s_isum++; if (in6_cksum(m, ip6->ip6_nxt, *offp, m->m_pkthdr.len - *offp)) { rip6stat.rip6s_badsum++; continue; } } if (last) { struct mbuf *n; n = m_copym(m, 0, M_COPYALL, M_NOWAIT); if (n != NULL) { struct socket *so; so = last->in6p_socket; if ((last->in6p_flags & IN6P_CONTROLOPTS) || (so->so_options & SO_TIMESTAMP)) { ip6_savecontrol(last, &opts, ip6, n); } /* strip intermediate headers */ m_adj(n, *offp); lwkt_gettoken(&so->so_rcv.ssb_token); if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&rip6src, n, opts) == 0) { m_freem(n); if (opts) m_freem(opts); rip6stat.rip6s_fullsock++; soroverflow(so); } else { sorwakeup(so); } lwkt_reltoken(&so->so_rcv.ssb_token); opts = NULL; } } last = in6p; } if (last) { struct socket *so; so = last->in6p_socket; if ((last->in6p_flags & IN6P_CONTROLOPTS) || (so->so_options & SO_TIMESTAMP)) { ip6_savecontrol(last, &opts, ip6, m); } /* strip intermediate headers */ m_adj(m, *offp); lwkt_gettoken(&so->so_rcv.ssb_token); if (ssb_appendaddr(&so->so_rcv, (struct sockaddr *)&rip6src, m, opts) == 0) { m_freem(m); if (opts) m_freem(opts); rip6stat.rip6s_fullsock++; soroverflow(so); } else { sorwakeup(so); } lwkt_reltoken(&so->so_rcv.ssb_token); } else { rip6stat.rip6s_nosock++; if (m->m_flags & M_MCAST) rip6stat.rip6s_nosockmcast++; if (proto == IPPROTO_NONE) m_freem(m); else { char *prvnxtp = ip6_get_prevhdr(m, *offp); /* XXX */ icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_NEXTHEADER, prvnxtp - mtod(m, char *)); } ip6stat.ip6s_delivered--; } return IPPROTO_DONE; } void rip6_ctlinput(netmsg_t msg) { int cmd = msg->ctlinput.nm_cmd; struct sockaddr *sa = msg->ctlinput.nm_arg; void *d = msg->ctlinput.nm_extra; struct ip6ctlparam *ip6cp = NULL; const struct sockaddr_in6 *sa6_src = NULL; inp_notify_t notify = in6_rtchange; if (sa->sa_family != AF_INET6 || sa->sa_len != sizeof(struct sockaddr_in6)) goto out; if ((unsigned)cmd >= PRC_NCMDS) goto out; if (PRC_IS_REDIRECT(cmd)) notify = in6_rtchange, d = NULL; else if (cmd == PRC_HOSTDEAD) d = NULL; else if (inet6ctlerrmap[cmd] == 0) goto out; /* if the parameter is from icmp6, decode it. */ if (d != NULL) { ip6cp = (struct ip6ctlparam *)d; sa6_src = ip6cp->ip6c_src; } else { sa6_src = &sa6_any; } in6_pcbnotify(&ripcbinfo, sa, 0, (const struct sockaddr *)sa6_src, 0, cmd, 0, notify); out: lwkt_replymsg(&msg->ctlinput.base.lmsg, 0); } /* * Generate IPv6 header and pass packet to ip6_output. * Tack on options user may have setup with control call. */ int rip6_output(struct mbuf *m, struct socket *so, ...) { struct sockaddr_in6 *dstsock; struct mbuf *control; struct in6_addr *dst; struct ip6_hdr *ip6; struct inpcb *in6p; u_int plen = m->m_pkthdr.len; int error = 0; struct ip6_pktopts opt, *optp = NULL; struct ifnet *oifp = NULL; int type = 0, code = 0; /* for ICMPv6 output statistics only */ int priv = 0; __va_list ap; __va_start(ap, so); dstsock = __va_arg(ap, struct sockaddr_in6 *); control = __va_arg(ap, struct mbuf *); __va_end(ap); if (IN6_IS_ADDR_V4MAPPED(&dstsock->sin6_addr)) { error = EADDRNOTAVAIL; goto bad; } in6p = so->so_pcb; priv = 0; if (so->so_cred->cr_uid == 0) priv = 1; dst = &dstsock->sin6_addr; if (control) { if ((error = ip6_setpktoptions(control, &opt, in6p->in6p_outputopts, so->so_proto->pr_protocol, priv)) != 0) goto bad; optp = &opt; } else optp = in6p->in6p_outputopts; /* * For an ICMPv6 packet, we should know its type and code * to update statistics. */ if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { struct icmp6_hdr *icmp6; if (m->m_len < sizeof(struct icmp6_hdr) && (m = m_pullup(m, sizeof(struct icmp6_hdr))) == NULL) { error = ENOBUFS; goto bad; } icmp6 = mtod(m, struct icmp6_hdr *); type = icmp6->icmp6_type; code = icmp6->icmp6_code; } M_PREPEND(m, sizeof(*ip6), M_WAITOK); ip6 = mtod(m, struct ip6_hdr *); /* * Next header might not be ICMP6 but use its pseudo header anyway. */ ip6->ip6_dst = *dst; /* * If the scope of the destination is link-local, embed the interface * index in the address. * * XXX advanced-api value overrides sin6_scope_id */ if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { struct in6_pktinfo *pi; /* * XXX Boundary check is assumed to be already done in * ip6_setpktoptions(). */ if (optp && (pi = optp->ip6po_pktinfo) && pi->ipi6_ifindex) { ip6->ip6_dst.s6_addr16[1] = htons(pi->ipi6_ifindex); oifp = ifindex2ifnet[pi->ipi6_ifindex]; } else if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && in6p->in6p_moptions && in6p->in6p_moptions->im6o_multicast_ifp) { oifp = in6p->in6p_moptions->im6o_multicast_ifp; ip6->ip6_dst.s6_addr16[1] = htons(oifp->if_index); } else if (dstsock->sin6_scope_id) { /* boundary check */ if (dstsock->sin6_scope_id < 0 || if_index < dstsock->sin6_scope_id) { error = ENXIO; /* XXX EINVAL? */ goto bad; } ip6->ip6_dst.s6_addr16[1] = htons(dstsock->sin6_scope_id & 0xffff); /* XXX */ } } /* * Source address selection. */ { struct in6_addr *in6a; if ((in6a = in6_selectsrc(dstsock, optp, in6p->in6p_moptions, &in6p->in6p_route, &in6p->in6p_laddr, &error, NULL)) == NULL) { if (error == 0) error = EADDRNOTAVAIL; goto bad; } ip6->ip6_src = *in6a; if (in6p->in6p_route.ro_rt) oifp = ifindex2ifnet[in6p->in6p_route.ro_rt->rt_ifp->if_index]; } ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) | (in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK); ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) | (IPV6_VERSION & IPV6_VERSION_MASK); /* ip6_plen will be filled in ip6_output, so not fill it here. */ ip6->ip6_nxt = in6p->in6p_ip6_nxt; ip6->ip6_hlim = in6_selecthlim(in6p, oifp); if (so->so_proto->pr_protocol == IPPROTO_ICMPV6 || in6p->in6p_cksum != -1) { struct mbuf *n; int off; u_int16_t *p; /* compute checksum */ if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) off = offsetof(struct icmp6_hdr, icmp6_cksum); else off = in6p->in6p_cksum; if (plen < off + 1) { error = EINVAL; goto bad; } off += sizeof(struct ip6_hdr); n = m; while (n && n->m_len <= off) { off -= n->m_len; n = n->m_next; } if (!n) goto bad; p = (u_int16_t *)(mtod(n, caddr_t) + off); *p = 0; *p = in6_cksum(m, ip6->ip6_nxt, sizeof(*ip6), plen); } error = ip6_output(m, optp, &in6p->in6p_route, 0, in6p->in6p_moptions, &oifp, in6p); if (so->so_proto->pr_protocol == IPPROTO_ICMPV6) { if (oifp) icmp6_ifoutstat_inc(oifp, type, code); icmp6stat.icp6s_outhist[type]++; } else rip6stat.rip6s_opackets++; goto freectl; bad: if (m) m_freem(m); freectl: if (optp == &opt && optp->ip6po_rthdr && optp->ip6po_route.ro_rt) RTFREE(optp->ip6po_route.ro_rt); if (control) { if (optp == &opt) ip6_clearpktopts(optp, -1); m_freem(control); } return (error); } /* * Raw IPv6 socket option processing. */ void rip6_ctloutput(netmsg_t msg) { struct socket *so = msg->ctloutput.base.nm_so; struct sockopt *sopt = msg->ctloutput.nm_sopt; int error; if (sopt->sopt_level == IPPROTO_ICMPV6) { /* * XXX: is it better to call icmp6_ctloutput() directly * from protosw? */ icmp6_ctloutput(msg); /* msg invalid now */ return; } if (sopt->sopt_level != IPPROTO_IPV6) { error = EINVAL; goto out; } error = 0; switch (sopt->sopt_dir) { case SOPT_GET: switch (sopt->sopt_name) { case MRT6_INIT: case MRT6_DONE: case MRT6_ADD_MIF: case MRT6_DEL_MIF: case MRT6_ADD_MFC: case MRT6_DEL_MFC: case MRT6_PIM: error = ip6_mrouter_get(so, sopt); break; case IPV6_CHECKSUM: error = ip6_raw_ctloutput(so, sopt); break; default: error = ip6_ctloutput(so, sopt); break; } break; case SOPT_SET: switch (sopt->sopt_name) { case MRT6_INIT: case MRT6_DONE: case MRT6_ADD_MIF: case MRT6_DEL_MIF: case MRT6_ADD_MFC: case MRT6_DEL_MFC: case MRT6_PIM: error = ip6_mrouter_set(so, sopt); break; case IPV6_CHECKSUM: error = ip6_raw_ctloutput(so, sopt); break; default: error = ip6_ctloutput(so, sopt); break; } break; } out: lwkt_replymsg(&msg->ctloutput.base.lmsg, error); } static void rip6_attach(netmsg_t msg) { struct socket *so = msg->attach.base.nm_so; int proto = msg->attach.nm_proto; struct pru_attach_info *ai = msg->attach.nm_ai; struct inpcb *inp; int error; inp = so->so_pcb; if (inp) panic("rip6_attach"); error = caps_priv_check(ai->p_ucred, SYSCAP_NONET_RAW | __SYSCAP_NULLCRED); if (error) goto out; error = soreserve(so, rip_sendspace, rip_recvspace, ai->sb_rlimit); if (error) goto out; crit_enter(); error = in_pcballoc(so, &ripcbinfo); crit_exit(); if (error) goto out; inp = (struct inpcb *)so->so_pcb; inp->in6p_ip6_nxt = (long)proto; inp->in6p_hops = -1; /* use kernel default */ inp->in6p_cksum = -1; inp->in6p_icmp6filt = kmalloc(sizeof(struct icmp6_filter), M_PCB, M_NOWAIT); if (inp->in6p_icmp6filt != NULL) ICMP6_FILTER_SETPASSALL(inp->in6p_icmp6filt); error = 0; out: lwkt_replymsg(&msg->attach.base.lmsg, error); } static void rip6_detach(netmsg_t msg) { struct socket *so = msg->detach.base.nm_so; struct inpcb *inp; inp = so->so_pcb; if (inp == NULL) panic("rip6_detach"); /* xxx: RSVP */ if (so == ip6_mrouter) ip6_mrouter_done(); if (inp->in6p_icmp6filt) { kfree(inp->in6p_icmp6filt, M_PCB); inp->in6p_icmp6filt = NULL; } in6_pcbdetach(inp); lwkt_replymsg(&msg->detach.base.lmsg, 0); } /* * NOTE: (so) is referenced from soabort*() and netmsg_pru_abort() * will sofree() it when we return. */ static void rip6_abort(netmsg_t msg) { soisdisconnected(msg->abort.base.nm_so); rip6_detach(msg); /* msg invalid now */ } static void rip6_disconnect(netmsg_t msg) { struct socket *so = msg->disconnect.base.nm_so; struct inpcb *inp = so->so_pcb; if (so->so_state & SS_ISCONNECTED) { inp->in6p_faddr = kin6addr_any; soreference(so); rip6_abort(msg); /* msg invalid now */ sofree(so); return; } lwkt_replymsg(&msg->disconnect.base.lmsg, ENOTCONN); } static void rip6_bind(netmsg_t msg) { struct socket *so = msg->bind.base.nm_so; struct sockaddr *nam = msg->bind.nm_nam; struct inpcb *inp = so->so_pcb; struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam; struct ifaddr *ia = NULL; int error; if (nam->sa_len != sizeof(*addr)) { error = EINVAL; goto out; } if (ifnet_array_isempty() || addr->sin6_family != AF_INET6) { error = EADDRNOTAVAIL; goto out; } if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) { error = EADDRNOTAVAIL; goto out; } #ifdef ENABLE_DEFAULT_SCOPE if (addr->sin6_scope_id == 0) { /* not change if specified */ addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr); } #endif if (!IN6_IS_ADDR_UNSPECIFIED(&addr->sin6_addr) && (ia = ifa_ifwithaddr((struct sockaddr *)addr)) == NULL) { error = EADDRNOTAVAIL; goto out; } if (ia && ((struct in6_ifaddr *)ia)->ia6_flags & (IN6_IFF_ANYCAST|IN6_IFF_NOTREADY| IN6_IFF_DETACHED|IN6_IFF_DEPRECATED)) { error = EADDRNOTAVAIL; goto out; } inp->in6p_laddr = addr->sin6_addr; error = 0; out: lwkt_replymsg(&msg->bind.base.lmsg, error); } static void rip6_connect(netmsg_t msg) { struct socket *so = msg->connect.base.nm_so; struct sockaddr *nam = msg->connect.nm_nam; struct inpcb *inp = so->so_pcb; struct sockaddr_in6 *addr = (struct sockaddr_in6 *)nam; struct in6_addr *in6a = NULL; int error = 0; #ifdef ENABLE_DEFAULT_SCOPE struct sockaddr_in6 tmp; #endif if (nam->sa_len != sizeof(*addr)) { error = EINVAL; goto out; } if (ifnet_array_isempty()) { error = EADDRNOTAVAIL; goto out; } if (addr->sin6_family != AF_INET6) { error = EAFNOSUPPORT; goto out; } if (IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr)) { error = EADDRNOTAVAIL; goto out; } #ifdef ENABLE_DEFAULT_SCOPE if (addr->sin6_scope_id == 0) { /* not change if specified */ /* avoid overwrites */ tmp = *addr; addr = &tmp; addr->sin6_scope_id = scope6_addr2default(&addr->sin6_addr); } #endif /* Source address selection. XXX: need pcblookup? */ in6a = in6_selectsrc(addr, inp->in6p_outputopts, inp->in6p_moptions, &inp->in6p_route, &inp->in6p_laddr, &error, NULL); if (in6a == NULL) { if (error == 0) error = EADDRNOTAVAIL; } else { inp->in6p_laddr = *in6a; inp->in6p_faddr = addr->sin6_addr; soisconnected(so); error = 0; } out: lwkt_replymsg(&msg->connect.base.lmsg, error); } static void rip6_shutdown(netmsg_t msg) { socantsendmore(msg->shutdown.base.nm_so); lwkt_replymsg(&msg->shutdown.base.lmsg, 0); } static void rip6_send(netmsg_t msg) { struct socket *so = msg->send.base.nm_so; struct mbuf *m = msg->send.nm_m; struct sockaddr *nam = msg->send.nm_addr; struct mbuf *control = msg->send.nm_control; struct inpcb *inp = so->so_pcb; struct sockaddr_in6 tmp; struct sockaddr_in6 *dst; int error; /* always copy sockaddr to avoid overwrites */ if (so->so_state & SS_ISCONNECTED) { if (nam) { m_freem(m); error = EISCONN; goto out; } /* XXX */ bzero(&tmp, sizeof(tmp)); tmp.sin6_family = AF_INET6; tmp.sin6_len = sizeof(struct sockaddr_in6); bcopy(&inp->in6p_faddr, &tmp.sin6_addr, sizeof(struct in6_addr)); dst = &tmp; } else { if (nam == NULL) { m_freem(m); error = ENOTCONN; goto out; } tmp = *(struct sockaddr_in6 *)nam; dst = &tmp; } #ifdef ENABLE_DEFAULT_SCOPE if (dst->sin6_scope_id == 0) { /* not change if specified */ dst->sin6_scope_id = scope6_addr2default(&dst->sin6_addr); } #endif error = rip6_output(m, so, dst, control); out: lwkt_replymsg(&msg->send.base.lmsg, error); } struct pr_usrreqs rip6_usrreqs = { .pru_abort = rip6_abort, .pru_accept = pr_generic_notsupp, .pru_attach = rip6_attach, .pru_bind = rip6_bind, .pru_connect = rip6_connect, .pru_connect2 = pr_generic_notsupp, .pru_control = in6_control_dispatch, .pru_detach = rip6_detach, .pru_disconnect = rip6_disconnect, .pru_listen = pr_generic_notsupp, .pru_peeraddr = in6_setpeeraddr_dispatch, .pru_rcvd = pr_generic_notsupp, .pru_rcvoob = pr_generic_notsupp, .pru_send = rip6_send, .pru_sense = pru_sense_null, .pru_shutdown = rip6_shutdown, .pru_sockaddr = in6_setsockaddr_dispatch, .pru_sosend = sosend, .pru_soreceive = soreceive };