/* $KAME: ip6_output.c,v 1.94 2000/04/04 14:45:44 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, 1988, 1990, 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. 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 * 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. * * @(#)ip_output.c 8.3 (Berkeley) 1/21/94 */ #if __FreeBSD__ #include "opt_ip6fw.h" #endif #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__) #include "opt_inet.h" #if __NetBSD__ /*XXX*/ #include "opt_ipsec.h" #endif #endif #include #include #include #include #include #include #include #include #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined (__APPLE__) #include #endif #include #include #include #include #include #if defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802) #include #include #endif #include #include #include #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__OpenBSD__) || (defined(__bsdi__) && _BSDI_VERSION >= 199802) || defined (__APPLE__) #include #else #include #endif #include #if IPSEC #include #include #include #endif /* IPSEC */ #ifndef __bsdi__ #include "loop.h" #endif #include #if IPV6FIREWALL #include #endif #if defined(__FreeBSD__) && __FreeBSD__ >= 3 static MALLOC_DEFINE(M_IPMOPTS, "ip6_moptions", "internet multicast options"); #endif struct ip6_exthdrs { struct mbuf *ip6e_ip6; struct mbuf *ip6e_hbh; struct mbuf *ip6e_dest1; struct mbuf *ip6e_rthdr; struct mbuf *ip6e_dest2; }; static int ip6_pcbopt __P((int, u_char *, int, struct ip6_pktopts **, int)); static int ip6_getpcbopt __P((struct ip6_pktopts *, int, void **, int *)); #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined(__APPLE__) static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, struct socket *, struct sockopt *sopt)); #else static int ip6_pcbopts __P((struct ip6_pktopts **, struct mbuf *, struct socket *)); #endif static int ip6_setmoptions __P((int, struct ip6_moptions **, struct mbuf *)); static int ip6_getmoptions __P((int, struct ip6_moptions *, struct mbuf **)); static int ip6_copyexthdr __P((struct mbuf **, caddr_t, int)); static int ip6_insertfraghdr __P((struct mbuf *, struct mbuf *, int, struct ip6_frag **)); static int ip6_insert_jumboopt __P((struct ip6_exthdrs *, u_int32_t)); static int ip6_splithdr __P((struct mbuf *, struct ip6_exthdrs *)); #if defined(__bsdi__) || defined(__OpenBSD__) extern struct ifnet loif; #endif #if __NetBSD__ extern struct ifnet **ifindex2ifnet; extern struct ifnet loif[NLOOP]; #endif #if MIP6 int (*mip6_output_hook)(struct mbuf *m, struct ip6_pktopts **opt); #endif /* MIP6 */ static u_long lo_dl_tag = 0; /* * IP6 output. The packet in mbuf chain m contains a skeletal IP6 * header (with pri, len, nxt, hlim, src, dst). * This function may modify ver and hlim only. * The mbuf chain containing the packet will be freed. * The mbuf opt, if present, will not be freed. */ int ip6_output(m0, opt, ro, flags, im6o, ifpp) struct mbuf *m0; struct ip6_pktopts *opt; struct route_in6 *ro; int flags; struct ip6_moptions *im6o; struct ifnet **ifpp; /* XXX: just for statistics */ { struct ip6_hdr *ip6, *mhip6; struct ifnet *ifp; struct mbuf *m = m0; int hlen, tlen, len, off; struct route_in6 ip6route; struct sockaddr_in6 *dst; int error = 0; struct in6_ifaddr *ia; u_long mtu; u_int32_t optlen = 0, plen = 0, unfragpartlen = 0; struct ip6_exthdrs exthdrs; struct in6_addr finaldst; struct route_in6 *ro_pmtu = NULL; int hdrsplit = 0; int needipsec = 0; #if IPSEC int needipsectun = 0; struct socket *so; struct secpolicy *sp = NULL; /* for AH processing. stupid to have "socket" variable in IP layer... */ so = ipsec_getsocket(m); ipsec_setsocket(m, NULL); ip6 = mtod(m, struct ip6_hdr *); #endif /* IPSEC */ #define MAKE_EXTHDR(hp,mp) \ { \ if (hp) { \ struct ip6_ext *eh = (struct ip6_ext *)(hp); \ error = ip6_copyexthdr((mp), (caddr_t)(hp), \ ((eh)->ip6e_len + 1) << 3); \ if (error) \ goto freehdrs; \ } \ } bzero(&exthdrs, sizeof(exthdrs)); #if MIP6 /* * Mobile IPv6 * * Call Mobile IPv6 to check if there are any Destination Header * options to add. */ if (mip6_output_hook) { error = (*mip6_output_hook)(m, &opt); if (error) goto freehdrs; } #endif /* MIP6 */ if (opt) { /* Hop-by-Hop options header */ MAKE_EXTHDR(opt->ip6po_hbh, &exthdrs.ip6e_hbh); if (opt->ip6po_rthdr) { /* * Destination options header(1st part) * This only makes sence with a routing header. */ MAKE_EXTHDR(opt->ip6po_dest1, &exthdrs.ip6e_dest1); } /* Routing header */ MAKE_EXTHDR(opt->ip6po_rthdr, &exthdrs.ip6e_rthdr); /* Destination options header(2nd part) */ MAKE_EXTHDR(opt->ip6po_dest2, &exthdrs.ip6e_dest2); } #if IPSEC /* get a security policy for this packet */ if (so == NULL) sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_OUTBOUND, 0, &error); else sp = ipsec6_getpolicybysock(m, IPSEC_DIR_OUTBOUND, so, &error); if (sp == NULL) { ipsec6stat.out_inval++; goto bad; } error = 0; /* check policy */ switch (sp->policy) { case IPSEC_POLICY_DISCARD: /* * This packet is just discarded. */ ipsec6stat.out_polvio++; goto bad; case IPSEC_POLICY_BYPASS: case IPSEC_POLICY_NONE: /* no need to do IPsec. */ needipsec = 0; break; case IPSEC_POLICY_IPSEC: if (sp->req == NULL) { /* acquire a policy */ error = key_spdacquire(sp); goto bad; } needipsec = 1; break; case IPSEC_POLICY_ENTRUST: default: printf("ip6_output: Invalid policy found. %d\n", sp->policy); } #endif /* IPSEC */ /* * Calculate the total length of the extension header chain. * Keep the length of the unfragmentable part for fragmentation. */ optlen = 0; if (exthdrs.ip6e_hbh) optlen += exthdrs.ip6e_hbh->m_len; if (exthdrs.ip6e_dest1) optlen += exthdrs.ip6e_dest1->m_len; if (exthdrs.ip6e_rthdr) optlen += exthdrs.ip6e_rthdr->m_len; unfragpartlen = optlen + sizeof(struct ip6_hdr); /* NOTE: we don't add AH/ESP length here. do that later. */ if (exthdrs.ip6e_dest2) optlen += exthdrs.ip6e_dest2->m_len; /* * If we need IPsec, or there is at least one extension header, * separate IP6 header from the payload. */ if ((needipsec || optlen) && !hdrsplit) { if ((error = ip6_splithdr(m, &exthdrs)) != 0) { m = NULL; goto freehdrs; } m = exthdrs.ip6e_ip6; hdrsplit++; } /* adjust pointer */ ip6 = mtod(m, struct ip6_hdr *); /* adjust mbuf packet header length */ m->m_pkthdr.len += optlen; plen = m->m_pkthdr.len - sizeof(*ip6); /* If this is a jumbo payload, insert a jumbo payload option. */ if (plen > IPV6_MAXPACKET) { if (!hdrsplit) { if ((error = ip6_splithdr(m, &exthdrs)) != 0) { m = NULL; goto freehdrs; } m = exthdrs.ip6e_ip6; hdrsplit++; } /* adjust pointer */ ip6 = mtod(m, struct ip6_hdr *); if ((error = ip6_insert_jumboopt(&exthdrs, plen)) != 0) goto freehdrs; ip6->ip6_plen = 0; } else ip6->ip6_plen = htons(plen); /* * Concatenate headers and fill in next header fields. * Here we have, on "m" * IPv6 payload * and we insert headers accordingly. Finally, we should be getting: * IPv6 hbh dest1 rthdr ah* [esp* dest2 payload] * * during the header composing process, "m" points to IPv6 header. * "mprev" points to an extension header prior to esp. */ { u_char *nexthdrp = &ip6->ip6_nxt; struct mbuf *mprev = m; /* * we treat dest2 specially. this makes IPsec processing * much easier. * * result: IPv6 dest2 payload * m and mprev will point to IPv6 header. */ if (exthdrs.ip6e_dest2) { if (!hdrsplit) panic("assumption failed: hdr not split"); exthdrs.ip6e_dest2->m_next = m->m_next; m->m_next = exthdrs.ip6e_dest2; *mtod(exthdrs.ip6e_dest2, u_char *) = ip6->ip6_nxt; ip6->ip6_nxt = IPPROTO_DSTOPTS; } #define MAKE_CHAIN(m,mp,p,i)\ {\ if (m) {\ if (!hdrsplit) \ panic("assumption failed: hdr not split"); \ *mtod((m), u_char *) = *(p);\ *(p) = (i);\ p = mtod((m), u_char *);\ (m)->m_next = (mp)->m_next;\ (mp)->m_next = (m);\ (mp) = (m);\ }\ } /* * result: IPv6 hbh dest1 rthdr dest2 payload * m will point to IPv6 header. mprev will point to the * extension header prior to dest2 (rthdr in the above case). */ MAKE_CHAIN(exthdrs.ip6e_hbh, mprev, nexthdrp, IPPROTO_HOPOPTS); MAKE_CHAIN(exthdrs.ip6e_dest1, mprev, nexthdrp, IPPROTO_DSTOPTS); MAKE_CHAIN(exthdrs.ip6e_rthdr, mprev, nexthdrp, IPPROTO_ROUTING); #if IPSEC if (!needipsec) goto skip_ipsec2; /* * pointers after IPsec headers are not valid any more. * other pointers need a great care too. * (IPsec routines should not mangle mbufs prior to AH/ESP) */ exthdrs.ip6e_dest2 = NULL; { struct ip6_rthdr *rh = NULL; int segleft_org = 0; struct ipsec_output_state state; if (exthdrs.ip6e_rthdr) { rh = mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *); segleft_org = rh->ip6r_segleft; rh->ip6r_segleft = 0; } bzero(&state, sizeof(state)); state.m = m; error = ipsec6_output_trans(&state, nexthdrp, mprev, sp, flags, &needipsectun); m = state.m; if (error) { /* mbuf is already reclaimed in ipsec6_output_trans. */ m = NULL; switch (error) { case EHOSTUNREACH: case ENETUNREACH: case EMSGSIZE: case ENOBUFS: case ENOMEM: break; default: printf("ip6_output (ipsec): error code %d\n", error); /*fall through*/ case ENOENT: /* don't show these error codes to the user */ error = 0; break; } goto bad; } if (exthdrs.ip6e_rthdr) { /* ah6_output doesn't modify mbuf chain */ rh->ip6r_segleft = segleft_org; } } skip_ipsec2:; #endif } /* * If there is a routing header, replace destination address field * with the first hop of the routing header. */ if (exthdrs.ip6e_rthdr) { struct ip6_rthdr *rh = (struct ip6_rthdr *)(mtod(exthdrs.ip6e_rthdr, struct ip6_rthdr *)); struct ip6_rthdr0 *rh0; struct in6_addr *addr; finaldst = ip6->ip6_dst; switch(rh->ip6r_type) { case IPV6_RTHDR_TYPE_0: rh0 = (struct ip6_rthdr0 *)rh; addr = (struct in6_addr *)(rh0 + 1); ip6->ip6_dst = *addr; bcopy((caddr_t)(addr + 1), (caddr_t)addr, sizeof(struct in6_addr)*(rh0->ip6r0_segleft - 1) ); *(addr + rh0->ip6r0_segleft - 1) = finaldst; break; default: /* is it possible? */ error = EINVAL; goto bad; } } /* Source address validation */ if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src) && (flags & IPV6_DADOUTPUT) == 0) { error = EOPNOTSUPP; ip6stat.ip6s_badscope++; goto bad; } if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src)) { error = EOPNOTSUPP; ip6stat.ip6s_badscope++; goto bad; } ip6stat.ip6s_localout++; /* * Route packet. */ if (ro == 0) { ro = &ip6route; bzero((caddr_t)ro, sizeof(*ro)); } ro_pmtu = ro; if (opt && opt->ip6po_rthdr) ro = &opt->ip6po_route; dst = (struct sockaddr_in6 *)&ro->ro_dst; /* * If there is a cached route, * check that it is to the same destination * and is still up. If not, free it and try again. */ if (ro->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) { RTFREE(ro->ro_rt); ro->ro_rt = (struct rtentry *)0; } if (ro->ro_rt == 0) { bzero(dst, sizeof(*dst)); dst->sin6_family = AF_INET6; dst->sin6_len = sizeof(struct sockaddr_in6); dst->sin6_addr = ip6->ip6_dst; } #if IPSEC if (needipsec && needipsectun) { struct ipsec_output_state state; /* * All the extension headers will become inaccessible * (since they can be encrypted). * Don't panic, we need no more updates to extension headers * on inner IPv6 packet (since they are now encapsulated). * * IPv6 [ESP|AH] IPv6 [extension headers] payload */ bzero(&exthdrs, sizeof(exthdrs)); exthdrs.ip6e_ip6 = m; bzero(&state, sizeof(state)); state.m = m; state.ro = (struct route *)ro; state.dst = (struct sockaddr *)dst; error = ipsec6_output_tunnel(&state, sp, flags); m = state.m; ro = (struct route_in6 *)state.ro; dst = (struct sockaddr_in6 *)state.dst; if (error) { /* mbuf is already reclaimed in ipsec6_output_tunnel. */ m0 = m = NULL; m = NULL; switch (error) { case EHOSTUNREACH: case ENETUNREACH: case EMSGSIZE: case ENOBUFS: case ENOMEM: break; default: printf("ip6_output (ipsec): error code %d\n", error); /*fall through*/ case ENOENT: /* don't show these error codes to the user */ error = 0; break; } goto bad; } exthdrs.ip6e_ip6 = m; } #endif /*IPSEC*/ if (!IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) { /* Unicast */ #define ifatoia6(ifa) ((struct in6_ifaddr *)(ifa)) #define sin6tosa(sin6) ((struct sockaddr *)(sin6)) /* xxx * interface selection comes here * if an interface is specified from an upper layer, * ifp must point it. */ if (ro->ro_rt == 0) { #ifndef __bsdi__ /* * non-bsdi always clone routes, if parent is * PRF_CLONING. */ rtalloc((struct route *)ro); #else if (ro == &ip6route) /* xxx kazu */ rtalloc((struct route *)ro); else rtcalloc((struct route *)ro); #endif } if (ro->ro_rt == 0) { ip6stat.ip6s_noroute++; error = EHOSTUNREACH; /* XXX in6_ifstat_inc(ifp, ifs6_out_discard); */ goto bad; } ia = ifatoia6(ro->ro_rt->rt_ifa); ifp = ro->ro_rt->rt_ifp; ro->ro_rt->rt_use++; if (ro->ro_rt->rt_flags & RTF_GATEWAY) dst = (struct sockaddr_in6 *)ro->ro_rt->rt_gateway; m->m_flags &= ~(M_BCAST | M_MCAST); /* just in case */ in6_ifstat_inc(ifp, ifs6_out_request); /* * Check if the outgoing interface conflicts with * the interface specified by ifi6_ifindex (if specified). * Note that loopback interface is always okay. * (this may happen when we are sending a packet to one of * our own addresses.) */ if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) { if (!(ifp->if_flags & IFF_LOOPBACK) && ifp->if_index != opt->ip6po_pktinfo->ipi6_ifindex) { ip6stat.ip6s_noroute++; in6_ifstat_inc(ifp, ifs6_out_discard); error = EHOSTUNREACH; goto bad; } } if (opt && opt->ip6po_hlim != -1) ip6->ip6_hlim = opt->ip6po_hlim & 0xff; } else { /* Multicast */ struct in6_multi *in6m; m->m_flags = (m->m_flags & ~M_BCAST) | M_MCAST; /* * See if the caller provided any multicast options */ ifp = NULL; if (im6o != NULL) { ip6->ip6_hlim = im6o->im6o_multicast_hlim; if (im6o->im6o_multicast_ifp != NULL) ifp = im6o->im6o_multicast_ifp; } else ip6->ip6_hlim = ip6_defmcasthlim; /* * See if the caller provided the outgoing interface * as an ancillary data. * Boundary check for ifindex is assumed to be already done. */ if (opt && opt->ip6po_pktinfo && opt->ip6po_pktinfo->ipi6_ifindex) ifp = ifindex2ifnet[opt->ip6po_pktinfo->ipi6_ifindex]; /* * If the destination is a node-local scope multicast, * the packet should be loop-backed only. */ if (IN6_IS_ADDR_MC_NODELOCAL(&ip6->ip6_dst)) { /* * If the outgoing interface is already specified, * it should be a loopback interface. */ if (ifp && (ifp->if_flags & IFF_LOOPBACK) == 0) { ip6stat.ip6s_badscope++; error = ENETUNREACH; /* XXX: better error? */ /* XXX correct ifp? */ in6_ifstat_inc(ifp, ifs6_out_discard); goto bad; } else { #ifdef __bsdi__ ifp = loifp; #else ifp = &loif[0]; #endif } } if (opt && opt->ip6po_hlim != -1) ip6->ip6_hlim = opt->ip6po_hlim & 0xff; /* * If caller did not provide an interface lookup a * default in the routing table. This is either a * default for the speicfied group (i.e. a host * route), or a multicast default (a route for the * ``net'' ff00::/8). */ if (ifp == NULL) { if (ro->ro_rt == 0) { ro->ro_rt = rtalloc1((struct sockaddr *) &ro->ro_dst, 0 #if __FreeBSD__ || defined (__APPLE__) , 0UL #endif ); } if (ro->ro_rt == 0) { ip6stat.ip6s_noroute++; error = EHOSTUNREACH; /* XXX in6_ifstat_inc(ifp, ifs6_out_discard) */ goto bad; } ia = ifatoia6(ro->ro_rt->rt_ifa); ifp = ro->ro_rt->rt_ifp; ro->ro_rt->rt_use++; } if ((flags & IPV6_FORWARDING) == 0) in6_ifstat_inc(ifp, ifs6_out_request); in6_ifstat_inc(ifp, ifs6_out_mcast); /* * Confirm that the outgoing interface supports multicast. */ if ((ifp->if_flags & IFF_MULTICAST) == 0) { ip6stat.ip6s_noroute++; in6_ifstat_inc(ifp, ifs6_out_discard); error = ENETUNREACH; goto bad; } IN6_LOOKUP_MULTI(ip6->ip6_dst, ifp, in6m); if (in6m != NULL && (im6o == NULL || im6o->im6o_multicast_loop)) { /* * If we belong to the destination multicast group * on the outgoing interface, and the caller did not * forbid loopback, loop back a copy. */ ip6_mloopback(ifp, m, dst); } else { /* * If we are acting as a multicast router, perform * multicast forwarding as if the packet had just * arrived on the interface to which we are about * to send. The multicast forwarding function * recursively calls this function, using the * IPV6_FORWARDING flag to prevent infinite recursion. * * Multicasts that are looped back by ip6_mloopback(), * above, will be forwarded by the ip6_input() routine, * if necessary. */ if (ip6_mrouter && (flags & IPV6_FORWARDING) == 0) { if (ip6_mforward(ip6, ifp, m) != NULL) { m_freem(m); goto done; } } } /* * Multicasts with a hoplimit of zero may be looped back, * above, but must not be transmitted on a network. * Also, multicasts addressed to the loopback interface * are not sent -- the above call to ip6_mloopback() will * loop back a copy if this host actually belongs to the * destination group on the loopback interface. */ if (ip6->ip6_hlim == 0 || (ifp->if_flags & IFF_LOOPBACK)) { m_freem(m); goto done; } } /* * Fill the outgoing inteface to tell the upper layer * to increment per-interface statistics. */ if (ifpp) *ifpp = ifp; /* * Upper-layer reachability confirmation */ if (opt && (opt->ip6po_flags & IP6PO_REACHCONF)) nd6_nud_hint(ro->ro_rt, NULL); /* * Determine path MTU. */ if (ro_pmtu != ro) { /* The first hop and the final destination may differ. */ struct sockaddr_in6 *sin6_fin = (struct sockaddr_in6 *)&ro_pmtu->ro_dst; if (ro_pmtu->ro_rt && ((ro->ro_rt->rt_flags & RTF_UP) == 0 || !IN6_ARE_ADDR_EQUAL(&sin6_fin->sin6_addr, &finaldst))) { RTFREE(ro_pmtu->ro_rt); ro_pmtu->ro_rt = (struct rtentry *)0; } if (ro_pmtu->ro_rt == 0) { bzero(sin6_fin, sizeof(*sin6_fin)); sin6_fin->sin6_family = AF_INET6; sin6_fin->sin6_len = sizeof(struct sockaddr_in6); sin6_fin->sin6_addr = finaldst; #ifdef __bsdi__ /* bsdi needs rtcalloc to clone a route. */ rtcalloc((struct route *)ro_pmtu); #else rtalloc((struct route *)ro_pmtu); #endif } } if (ro_pmtu->ro_rt != NULL) { u_int32_t ifmtu = nd_ifinfo[ifp->if_index].linkmtu; mtu = ro_pmtu->ro_rt->rt_rmx.rmx_mtu; if (mtu > ifmtu) { /* * The MTU on the route is larger than the MTU on * the interface! This shouldn't happen, unless the * MTU of the interface has been changed after the * interface was brought up. Change the MTU in the * route to match the interface MTU (as long as the * field isn't locked). */ mtu = ifmtu; if ((ro_pmtu->ro_rt->rt_rmx.rmx_locks & RTV_MTU) == 0) ro_pmtu->ro_rt->rt_rmx.rmx_mtu = mtu; /* XXX */ } } else { mtu = nd_ifinfo[ifp->if_index].linkmtu; } /* * advanced API (IPV6_USE_MIN_MTU) overrides mtu setting */ if (mtu > IPV6_MMTU) { if ((opt && (opt->ip6po_flags & IP6PO_MINMTU)) || (flags & IPV6_MINMTU)) { mtu = IPV6_MMTU; } } /* * Fake link-local scope-class addresses */ if ((ifp->if_flags & IFF_LOOPBACK) == 0) { if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) ip6->ip6_src.s6_addr16[1] = 0; if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) ip6->ip6_dst.s6_addr16[1] = 0; } #if IPV6FIREWALL /* * Check with the firewall... */ if (ip6_fw_chk_ptr) { u_short port = 0; /* If ipfw says divert, we have to just drop packet */ if ((*ip6_fw_chk_ptr)(&ip6, ifp, &port, &m)) { m_freem(m); goto done; } if (!m) { error = EACCES; goto done; } } #endif /* * If the outgoing packet contains a hop-by-hop options header, * it must be examined and processed even by the source node. * (RFC 2460, section 4.) */ if (exthdrs.ip6e_hbh) { struct ip6_hbh *hbh = mtod(exthdrs.ip6e_hbh, struct ip6_hbh *); u_int32_t dummy1; /* XXX unused */ u_int32_t dummy2; /* XXX unused */ /* * XXX: if we have to send an ICMPv6 error to the sender, * we need the M_LOOP flag since icmp6_error() expects * the IPv6 and the hop-by-hop options header are * continuous unless the flag is set. */ m->m_flags |= M_LOOP; m->m_pkthdr.rcvif = ifp; if (ip6_process_hopopts(m, (u_int8_t *)(hbh + 1), ((hbh->ip6h_len + 1) << 3) - sizeof(struct ip6_hbh), &dummy1, &dummy2) < 0) { /* m was already freed at this point */ error = EINVAL;/* better error? */ goto done; } m->m_flags &= ~M_LOOP; /* XXX */ m->m_pkthdr.rcvif = NULL; } /* * Send the packet to the outgoing interface. * If necessary, do IPv6 fragmentation before sending. */ tlen = m->m_pkthdr.len; if (tlen <= mtu #if notyet /* * On any link that cannot convey a 1280-octet packet in one piece, * link-specific fragmentation and reassembly must be provided at * a layer below IPv6. [RFC 2460, sec.5] * Thus if the interface has ability of link-level fragmentation, * we can just send the packet even if the packet size is * larger than the link's MTU. * XXX: IFF_FRAGMENTABLE (or such) flag has not been defined yet... */ || ifp->if_flags & IFF_FRAGMENTABLE #endif ) { #if defined(__NetBSD__) && defined(IFA_STATS) if (IFA_STATS) { struct in6_ifaddr *ia6; ip6 = mtod(m, struct ip6_hdr *); ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); if (ia6) { ia->ia_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len; } } #endif #if OLDIP6OUTPUT error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, ro->ro_rt); #else error = nd6_output(ifp, m, dst, ro->ro_rt); #endif goto done; } else if (mtu < IPV6_MMTU) { /* * note that path MTU is never less than IPV6_MMTU * (see icmp6_input). */ error = EMSGSIZE; in6_ifstat_inc(ifp, ifs6_out_fragfail); goto bad; } else if (ip6->ip6_plen == 0) { /* jumbo payload cannot be fragmented */ error = EMSGSIZE; in6_ifstat_inc(ifp, ifs6_out_fragfail); goto bad; } else { struct mbuf **mnext, *m_frgpart; struct ip6_frag *ip6f; u_int32_t id = htonl(ip6_id++); u_char nextproto; /* * Too large for the destination or interface; * fragment if possible. * Must be able to put at least 8 bytes per fragment. */ hlen = unfragpartlen; if (mtu > IPV6_MAXPACKET) mtu = IPV6_MAXPACKET; len = (mtu - hlen - sizeof(struct ip6_frag)) & ~7; if (len < 8) { error = EMSGSIZE; in6_ifstat_inc(ifp, ifs6_out_fragfail); goto bad; } mnext = &m->m_nextpkt; /* * Change the next header field of the last header in the * unfragmentable part. */ if (exthdrs.ip6e_rthdr) { nextproto = *mtod(exthdrs.ip6e_rthdr, u_char *); *mtod(exthdrs.ip6e_rthdr, u_char *) = IPPROTO_FRAGMENT; } else if (exthdrs.ip6e_dest1) { nextproto = *mtod(exthdrs.ip6e_dest1, u_char *); *mtod(exthdrs.ip6e_dest1, u_char *) = IPPROTO_FRAGMENT; } else if (exthdrs.ip6e_hbh) { nextproto = *mtod(exthdrs.ip6e_hbh, u_char *); *mtod(exthdrs.ip6e_hbh, u_char *) = IPPROTO_FRAGMENT; } else { nextproto = ip6->ip6_nxt; ip6->ip6_nxt = IPPROTO_FRAGMENT; } /* * Loop through length of segment after first fragment, * make new header and copy data of each part and link onto chain. */ m0 = m; for (off = hlen; off < tlen; off += len) { MGETHDR(m, M_DONTWAIT, MT_HEADER); if (!m) { error = ENOBUFS; ip6stat.ip6s_odropped++; goto sendorfree; } m->m_flags = m0->m_flags & M_COPYFLAGS; *mnext = m; mnext = &m->m_nextpkt; m->m_data += max_linkhdr; mhip6 = mtod(m, struct ip6_hdr *); *mhip6 = *ip6; m->m_len = sizeof(*mhip6); error = ip6_insertfraghdr(m0, m, hlen, &ip6f); if (error) { ip6stat.ip6s_odropped++; goto sendorfree; } ip6f->ip6f_offlg = htons((u_short)((off - hlen) & ~7)); if (off + len >= tlen) len = tlen - off; else ip6f->ip6f_offlg |= IP6F_MORE_FRAG; mhip6->ip6_plen = htons((u_short)(len + hlen + sizeof(*ip6f) - sizeof(struct ip6_hdr))); if ((m_frgpart = m_copy(m0, off, len)) == 0) { error = ENOBUFS; ip6stat.ip6s_odropped++; goto sendorfree; } m_cat(m, m_frgpart); m->m_pkthdr.len = len + hlen + sizeof(*ip6f); m->m_pkthdr.rcvif = (struct ifnet *)0; ip6f->ip6f_reserved = 0; ip6f->ip6f_ident = id; ip6f->ip6f_nxt = nextproto; ip6stat.ip6s_ofragments++; in6_ifstat_inc(ifp, ifs6_out_fragcreat); } in6_ifstat_inc(ifp, ifs6_out_fragok); } /* * Remove leading garbages. */ sendorfree: m = m0->m_nextpkt; m0->m_nextpkt = 0; m_freem(m0); for (m0 = m; m; m = m0) { m0 = m->m_nextpkt; m->m_nextpkt = 0; if (error == 0) { #if defined(__NetBSD__) && defined(IFA_STATS) if (IFA_STATS) { struct in6_ifaddr *ia6; ip6 = mtod(m, struct ip6_hdr *); ia6 = in6_ifawithifp(ifp, &ip6->ip6_src); if (ia6) { ia->ia_ifa.ifa_data.ifad_outbytes += m->m_pkthdr.len; } } #endif #if OLDIP6OUTPUT error = (*ifp->if_output)(ifp, m, (struct sockaddr *)dst, ro->ro_rt); #else error = nd6_output(ifp, m, dst, ro->ro_rt); #endif } else m_freem(m); } if (error == 0) ip6stat.ip6s_fragmented++; done: if (ro == &ip6route && ro->ro_rt) { /* brace necessary for RTFREE */ RTFREE(ro->ro_rt); } else if (ro_pmtu == &ip6route && ro_pmtu->ro_rt) { RTFREE(ro_pmtu->ro_rt); } #if IPSEC if (sp != NULL) key_freesp(sp); #endif /* IPSEC */ return(error); freehdrs: m_freem(exthdrs.ip6e_hbh); /* m_freem will check if mbuf is 0 */ m_freem(exthdrs.ip6e_dest1); m_freem(exthdrs.ip6e_rthdr); m_freem(exthdrs.ip6e_dest2); /* fall through */ bad: m_freem(m); goto done; } static int ip6_copyexthdr(mp, hdr, hlen) struct mbuf **mp; caddr_t hdr; int hlen; { struct mbuf *m; if (hlen > MCLBYTES) return(ENOBUFS); /* XXX */ MGET(m, M_DONTWAIT, MT_DATA); if (!m) return(ENOBUFS); if (hlen > MLEN) { MCLGET(m, M_DONTWAIT); if ((m->m_flags & M_EXT) == 0) { m_free(m); return(ENOBUFS); } } m->m_len = hlen; if (hdr) bcopy(hdr, mtod(m, caddr_t), hlen); *mp = m; return(0); } /* * Insert jumbo payload option. */ static int ip6_insert_jumboopt(exthdrs, plen) struct ip6_exthdrs *exthdrs; u_int32_t plen; { struct mbuf *mopt; u_char *optbuf; #define JUMBOOPTLEN 8 /* length of jumbo payload option and padding */ /* * If there is no hop-by-hop options header, allocate new one. * If there is one but it doesn't have enough space to store the * jumbo payload option, allocate a cluster to store the whole options. * Otherwise, use it to store the options. */ if (exthdrs->ip6e_hbh == 0) { MGET(mopt, M_DONTWAIT, MT_DATA); if (mopt == 0) return(ENOBUFS); mopt->m_len = JUMBOOPTLEN; optbuf = mtod(mopt, u_char *); optbuf[1] = 0; /* = ((JUMBOOPTLEN) >> 3) - 1 */ exthdrs->ip6e_hbh = mopt; } else { struct ip6_hbh *hbh; mopt = exthdrs->ip6e_hbh; if (M_TRAILINGSPACE(mopt) < JUMBOOPTLEN) { caddr_t oldoptp = mtod(mopt, caddr_t); int oldoptlen = mopt->m_len; if (mopt->m_flags & M_EXT) return(ENOBUFS); /* XXX */ MCLGET(mopt, M_DONTWAIT); if ((mopt->m_flags & M_EXT) == 0) return(ENOBUFS); bcopy(oldoptp, mtod(mopt, caddr_t), oldoptlen); optbuf = mtod(mopt, caddr_t) + oldoptlen; mopt->m_len = oldoptlen + JUMBOOPTLEN; } else { optbuf = mtod(mopt, u_char *) + mopt->m_len; mopt->m_len += JUMBOOPTLEN; } optbuf[0] = IP6OPT_PADN; optbuf[1] = 1; /* * Adjust the header length according to the pad and * the jumbo payload option. */ hbh = mtod(mopt, struct ip6_hbh *); hbh->ip6h_len += (JUMBOOPTLEN >> 3); } /* fill in the option. */ optbuf[2] = IP6OPT_JUMBO; optbuf[3] = 4; *(u_int32_t *)&optbuf[4] = htonl(plen + JUMBOOPTLEN); /* finally, adjust the packet header length */ exthdrs->ip6e_ip6->m_pkthdr.len += JUMBOOPTLEN; return(0); #undef JUMBOOPTLEN } /* * Insert fragment header and copy unfragmentable header portions. */ static int ip6_insertfraghdr(m0, m, hlen, frghdrp) struct mbuf *m0, *m; int hlen; struct ip6_frag **frghdrp; { struct mbuf *n, *mlast; if (hlen > sizeof(struct ip6_hdr)) { n = m_copym(m0, sizeof(struct ip6_hdr), hlen - sizeof(struct ip6_hdr), M_DONTWAIT); if (n == 0) return(ENOBUFS); m->m_next = n; } else n = m; /* Search for the last mbuf of unfragmentable part. */ for (mlast = n; mlast->m_next; mlast = mlast->m_next) ; if ((mlast->m_flags & M_EXT) == 0 && M_TRAILINGSPACE(mlast) < sizeof(struct ip6_frag)) { /* use the trailing space of the last mbuf for the fragment hdr */ *frghdrp = (struct ip6_frag *)(mtod(mlast, caddr_t) + mlast->m_len); mlast->m_len += sizeof(struct ip6_frag); m->m_pkthdr.len += sizeof(struct ip6_frag); } else { /* allocate a new mbuf for the fragment header */ struct mbuf *mfrg; MGET(mfrg, M_DONTWAIT, MT_DATA); if (mfrg == 0) return(ENOBUFS); mfrg->m_len = sizeof(struct ip6_frag); *frghdrp = mtod(mfrg, struct ip6_frag *); mlast->m_next = mfrg; } return(0); } /* * IP6 socket option processing. */ #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) int ip6_ctloutput(so, sopt) struct socket *so; struct sockopt *sopt; #else int ip6_ctloutput(op, so, level, optname, mp) int op; struct socket *so; int level, optname; struct mbuf **mp; #endif { int privileged, optdatalen; void *optdata; struct ip6_recvpktopts *rcvopts; #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) register struct inpcb *in6p = sotoinpcb(so); int error, optval; int level, op, optname; int optlen; struct proc *p; if (sopt) { level = sopt->sopt_level; op = sopt->sopt_dir; optname = sopt->sopt_name; optlen = sopt->sopt_valsize; p = sopt->sopt_p; } else { panic("ip6_ctloutput: arg soopt is NULL"); } #else #if HAVE_NRL_INPCB register struct inpcb *inp = sotoinpcb(so); #else register struct in6pcb *in6p = sotoin6pcb(so); #endif register struct mbuf *m = *mp; int error, optval; int optlen; #if !defined(__bsdi__) && !(defined(__FreeBSD__) && __FreeBSD__ < 3) && !defined (__APPLE__) struct proc *p = curproc; /* XXX */ #endif optlen = m ? m->m_len : 0; #endif error = optval = 0; #if !defined(__bsdi__) && !(defined(__FreeBSD__) && __FreeBSD__ < 3) && !defined (__APPLE__) privileged = (p == 0 || suser(p->p_ucred, &p->p_acflag)) ? 0 : 1; #else #if HAVE_NRL_INPCB privileged = (inp->inp_socket->so_state & SS_PRIV); #else privileged = (in6p->in6p_socket->so_state & SS_PRIV); #endif #endif #if defined(HAVE_NRL_INPCB) rcvopts = inp->inp_inputopts6; #else rcvopts = in6p->in6p_inputopts; #endif if (level == IPPROTO_IPV6) { switch (op) { #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) case SOPT_SET: #else case PRCO_SETOPT: #endif switch (optname) { case IPV6_PKTOPTIONS: { #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) struct mbuf *m; error = sooptgetm(sopt, &m); /* XXX */ if (error != NULL) break; error = sooptmcopyin(sopt, m); /* XXX */ if (error != NULL) break; error = ip6_pcbopts(&in6p->in6p_outputopts, m, so, sopt); m_freem(m); /* XXX */ #else #if HAVE_NRL_INPCB error = ip6_pcbopts(&inp->inp_outputopts6, m, so); #else error = ip6_pcbopts(&in6p->in6p_outputopts, m, so); #endif /* HAVE_NRL_INPCB */ #endif /* FreeBSD >= 3 */ break; } /* * Use of some Hop-by-Hop options or some * Destination options, might require special * privilege. That is, normal applications * (without special privilege) might be forbidden * from setting certain options in outgoing packets, * and might never see certain options in received * packets. [RFC 2292 Section 6] * KAME specific note: * KAME prevents non-privileged users from sending or * receiving ANY hbh/dst options in order to avoid * overhead of parsing options in the kernel. */ case IPV6_RECVHOPOPTS: case IPV6_RECVDSTOPTS: case IPV6_RECVRTHDRDSTOPTS: if (!privileged) { error = EPERM; break; } /* fall through */ case IPV6_UNICAST_HOPS: case IPV6_HOPLIMIT: case IPV6_CHECKSUM: case IPV6_FAITH: case IPV6_RECVPKTINFO: case IPV6_RECVHOPLIMIT: case IPV6_RECVRTHDR: case IPV6_USE_MIN_MTU: #ifdef notyet /* To be implemented */ case IPV6_RECVPATHMTU: #endif #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) case IPV6_BINDV6ONLY: #endif if (optlen != sizeof(int)) error = EINVAL; else { #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); if (error) break; #else optval = *mtod(m, int *); #endif switch (optname) { case IPV6_UNICAST_HOPS: if (optval < -1 || optval >= 256) error = EINVAL; else { /* -1 = kernel default */ #if HAVE_NRL_INPCB inp->inp_hops = optval; #else in6p->in6p_hops = optval; #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) if ((in6p->in6p_vflag & INP_IPV4) != 0) in6p->inp_ip_ttl = optval; #endif #endif } break; #if HAVE_NRL_INPCB #define OPTSET(bit) \ if (optval) \ inp->inp_flags |= (bit); \ else \ inp->inp_flags &= ~(bit); #else #define OPTSET(bit) \ if (optval) \ in6p->in6p_flags |= (bit); \ else \ in6p->in6p_flags &= ~(bit); #endif #if HAVE_NRL_INPCB #define OPTBIT(bit) (inp->inp_flags & (bit) ? 1 : 0) #else #define OPTBIT(bit) (in6p->in6p_flags & (bit) ? 1 : 0) #endif case IPV6_RECVPKTINFO: OPTSET(IN6P_PKTINFO); if (OPTBIT(IN6P_PKTINFO) == 0) ip6_reset_rcvopt(rcvopts, IPV6_RECVPKTINFO); break; case IPV6_HOPLIMIT: { #if COMPAT_RFC2292 OPTSET(IN6P_HOPLIMIT); if (OPTBIT(IN6P_HOPLIMIT) == 0) ip6_reset_rcvopt(rcvopts, IPV6_RECVHOPLIMIT); break; #else /* new advanced API (2292bis) */ struct ip6_pktopts **optp; #if HAVE_NRL_INPCB optp = &inp->inp_outputopts6; #else optp = &in6p->in6p_outputopts; #endif error = ip6_pcbopt(IPV6_HOPLIMIT, (u_char *)&optval, sizeof(optval), optp, privileged); break; #endif } case IPV6_RECVHOPLIMIT: OPTSET(IN6P_HOPLIMIT); if (OPTBIT(IN6P_HOPLIMIT) == 0) ip6_reset_rcvopt(rcvopts, IPV6_RECVHOPLIMIT); break; case IPV6_RECVHOPOPTS: OPTSET(IN6P_HOPOPTS); if (OPTBIT(IN6P_HOPOPTS) == 0) ip6_reset_rcvopt(rcvopts, IPV6_RECVHOPOPTS); break; case IPV6_RECVDSTOPTS: OPTSET(IN6P_DSTOPTS); if (OPTBIT(IN6P_DSTOPTS) == 0) ip6_reset_rcvopt(rcvopts, IPV6_RECVDSTOPTS); break; case IPV6_RECVRTHDRDSTOPTS: OPTSET(IN6P_RTHDRDSTOPTS); if (OPTBIT(IN6P_RTHDRDSTOPTS) == 0) ip6_reset_rcvopt(rcvopts, IPV6_RECVRTHDRDSTOPTS); break; case IPV6_RECVRTHDR: OPTSET(IN6P_RTHDR); if (OPTBIT(IN6P_RTHDR) == 0) ip6_reset_rcvopt(rcvopts, IPV6_RECVRTHDR); break; case IPV6_CHECKSUM: #if HAVE_NRL_INPCB inp->inp_csumoffset = optval; #else in6p->in6p_cksum = optval; #endif break; case IPV6_FAITH: OPTSET(IN6P_FAITH); break; case IPV6_USE_MIN_MTU: OPTSET(IN6P_MINMTU); break; #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || (defined(__NetBSD__) && !defined(INET6_BINDV6ONLY)) || defined (__APPLE__) case IPV6_BINDV6ONLY: OPTSET(IN6P_BINDV6ONLY); break; #endif } } break; case IPV6_PKTINFO: case IPV6_HOPOPTS: case IPV6_RTHDR: case IPV6_DSTOPTS: case IPV6_RTHDRDSTOPTS: if (optlen == sizeof(int)) { /* RFC 2292 */ #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); if (error == 0) break; #else optval = *mtod(m, int *); #endif switch(optname) { case IPV6_PKTINFO: OPTSET(IN6P_PKTINFO); if (OPTBIT(IN6P_PKTINFO) == 0) ip6_reset_rcvopt(rcvopts, IPV6_RECVPKTINFO); break; case IPV6_HOPOPTS: /* * Check super-user privilege. * See comments for * IPV6_RECVHOPOPTS. */ if (!privileged) return(EPERM); OPTSET(IN6P_HOPOPTS); if (OPTBIT(IN6P_HOPOPTS) == 0) ip6_reset_rcvopt(rcvopts, IPV6_RECVHOPOPTS); break; case IPV6_DSTOPTS: if (!privileged) return(EPERM); OPTSET(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); /* XXX */ if (OPTBIT(IN6P_DSTOPTS) == 0) { ip6_reset_rcvopt(rcvopts, IPV6_RECVDSTOPTS); ip6_reset_rcvopt(rcvopts, IPV6_RECVRTHDRDSTOPTS); } break; case IPV6_RTHDR: OPTSET(IN6P_RTHDR); if (OPTBIT(IN6P_RTHDR) == 0) ip6_reset_rcvopt(rcvopts, IPV6_RECVRTHDR); break; } break; } else { /* new advanced API (2292bis) */ u_char *optbuf; int optlen; struct ip6_pktopts **optp; #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) optbuf = sopt->sopt_val; optlen = sopt->sopt_valsize; #else /* !fbsd3 */ if (m && m->m_next) { error = EINVAL; /* XXX */ break; } if (m) { optbuf = mtod(m, u_char *); optlen = m->m_len; } else { optbuf = NULL; optlen = 0; } #endif #if HAVE_NRL_INPCB optp = &inp->inp_outputopts6; #else optp = &in6p->in6p_outputopts; #endif error = ip6_pcbopt(optname, optbuf, optlen, optp, privileged); } break; #undef OPTSET case IPV6_MULTICAST_IF: case IPV6_MULTICAST_HOPS: case IPV6_MULTICAST_LOOP: case IPV6_JOIN_GROUP: case IPV6_LEAVE_GROUP: #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) { struct mbuf *m; if (sopt->sopt_valsize > MLEN) { error = EMSGSIZE; break; } /* XXX */ MGET(m, sopt->sopt_p ? M_WAIT : M_DONTWAIT, MT_HEADER); if (m == 0) { error = ENOBUFS; break; } m->m_len = sopt->sopt_valsize; error = sooptcopyin(sopt, mtod(m, char *), m->m_len, m->m_len); error = ip6_setmoptions(sopt->sopt_name, &in6p->in6p_moptions, m); (void)m_free(m); } #else #if HAVE_NRL_INPCB error = ip6_setmoptions(optname, &inp->inp_moptions6, m); /* * XXX: setting the flag would be redundant * except at the first time. Also, we * actually don't have to reset the flag, * since ip6_freemoptions() would simply * return when the inp_moptions6 is NULL. */ if (inp->inp_moptions6) inp->inp_flags |= INP_IPV6_MCAST; else inp->inp_flags &= ~INP_IPV6_MCAST; #else error = ip6_setmoptions(optname, &in6p->in6p_moptions, m); #endif #endif break; #ifndef __bsdi__ case IPV6_PORTRANGE: #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) error = sooptcopyin(sopt, &optval, sizeof optval, sizeof optval); if (error) break; #else optval = *mtod(m, int *); #endif #if HAVE_NRL_INPCB # define in6p inp # define in6p_flags inp_flags #endif switch (optval) { case IPV6_PORTRANGE_DEFAULT: in6p->in6p_flags &= ~(IN6P_LOWPORT); in6p->in6p_flags &= ~(IN6P_HIGHPORT); break; case IPV6_PORTRANGE_HIGH: in6p->in6p_flags &= ~(IN6P_LOWPORT); in6p->in6p_flags |= IN6P_HIGHPORT; break; case IPV6_PORTRANGE_LOW: in6p->in6p_flags &= ~(IN6P_HIGHPORT); in6p->in6p_flags |= IN6P_LOWPORT; break; default: error = EINVAL; break; } #if HAVE_NRL_INPCB # undef in6p # undef in6p_flags #endif break; #endif #if IPSEC case IPV6_IPSEC_POLICY: { caddr_t req = NULL; size_t len = 0; #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) struct mbuf *m; #endif #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) if (error = sooptgetm(sopt, &m)) /* XXX */ break; if (error = sooptmcopyin(sopt, m)) /* XXX */ break; #endif if (m) { req = mtod(m, caddr_t); len = m->m_len; } #if HAVE_NRL_INPCB error = ipsec6_set_policy(inp, optname, req, len, privileged); #else error = ipsec6_set_policy(in6p, optname, req, len, privileged); #endif #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) m_freem(m); #endif } break; #endif /* IPSEC */ #if IPV6FIREWALL case IPV6_FW_ADD: case IPV6_FW_DEL: case IPV6_FW_FLUSH: case IPV6_FW_ZERO: { #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) struct mbuf *m; struct mbuf **mp = &m; #endif #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) if (ip6_fw_ctl_ptr == NULL) return EINVAL; if (error = sooptgetm(sopt, &m)) /* XXX */ break; if (error = sooptmcopyin(sopt, m)) /* XXX */ break; #else if (ip6_fw_ctl_ptr == NULL) { if (m) (void)m_free(m); return EINVAL; } #endif error = (*ip6_fw_ctl_ptr)(optname, mp); m = *mp; } break; #endif default: error = ENOPROTOOPT; break; } #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__APPLE__) if (m) (void)m_free(m); #endif break; #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) case SOPT_GET: #else case PRCO_GETOPT: #endif switch (optname) { case IPV6_PKTOPTIONS: #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) if (in6p->in6p_inputopts && in6p->in6p_inputopts->head) { error = sooptmcopyout(sopt, in6p->in6p_inputopts->head); } else sopt->sopt_valsize = 0; #elif defined(HAVE_NRL_INPCB) if (inp->inp_options) { *mp = m_copym(inp->inp_options, 0, M_COPYALL, M_WAIT); } else { *mp = m_get(M_WAIT, MT_SOOPTS); (*mp)->m_len = 0; } #else if (in6p->in6p_inputopts && in6p->in6p_inputopts->head) { *mp = m_copym(in6p->in6p_inputopts->head, 0, M_COPYALL, M_WAIT); } else { *mp = m_get(M_WAIT, MT_SOOPTS); (*mp)->m_len = 0; } #endif break; case IPV6_RECVHOPOPTS: case IPV6_RECVDSTOPTS: case IPV6_RECVRTHDRDSTOPTS: if (!privileged) { error = EPERM; break; } /* fall through */ case IPV6_UNICAST_HOPS: case IPV6_CHECKSUM: case IPV6_RECVPKTINFO: case IPV6_RECVHOPLIMIT: case IPV6_RECVRTHDR: case IPV6_USE_MIN_MTU: #ifdef notyet /* To be implemented */ case IPV6_RECVPATHMTU: #endif case IPV6_FAITH: #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || (defined(__NetBSD__) && !defined(INET6_BINDV6ONLY)) || defined(__APPLE__) case IPV6_BINDV6ONLY: #endif #ifndef __bsdi__ case IPV6_PORTRANGE: #endif switch (optname) { case IPV6_UNICAST_HOPS: #if HAVE_NRL_INPCB optval = inp->inp_hops; #else optval = in6p->in6p_hops; #endif break; case IPV6_RECVPKTINFO: optval = OPTBIT(IN6P_PKTINFO); break; case IPV6_RECVHOPLIMIT: optval = OPTBIT(IN6P_HOPLIMIT); break; case IPV6_RECVHOPOPTS: optval = OPTBIT(IN6P_HOPOPTS); break; case IPV6_RECVDSTOPTS: optval = OPTBIT(IN6P_DSTOPTS); break; case IPV6_RECVRTHDRDSTOPTS: optval = OPTBIT(IN6P_RTHDRDSTOPTS); break; case IPV6_CHECKSUM: #if HAVE_NRL_INPCB optval = inp->inp_csumoffset; #else optval = in6p->in6p_cksum; #endif break; case IPV6_USE_MIN_MTU: optval = OPTBIT(IN6P_MINMTU); break; case IPV6_FAITH: optval = OPTBIT(IN6P_FAITH); break; #if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || (defined(__NetBSD__) && !defined(INET6_BINDV6ONLY)) || defined (__APPLE__) case IPV6_BINDV6ONLY: optval = OPTBIT(IN6P_BINDV6ONLY); break; #endif #ifndef __bsdi__ case IPV6_PORTRANGE: { int flags; #if HAVE_NRL_INPCB flags = inp->inp_flags; #else flags = in6p->in6p_flags; #endif if (flags & IN6P_HIGHPORT) optval = IPV6_PORTRANGE_HIGH; else if (flags & IN6P_LOWPORT) optval = IPV6_PORTRANGE_LOW; else optval = 0; break; } #endif } #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) error = sooptcopyout(sopt, &optval, sizeof optval); #else *mp = m = m_get(M_WAIT, MT_SOOPTS); m->m_len = sizeof(int); *mtod(m, int *) = optval; #endif break; case IPV6_PKTINFO: case IPV6_HOPOPTS: case IPV6_RTHDR: case IPV6_DSTOPTS: case IPV6_RTHDRDSTOPTS: #if COMPAT_RFC2292 if (optname == IPV6_HOPOPTS || optname == IPV6_DSTOPTS || !privileged) return(EPERM); switch(optname) { case IPV6_PKTINFO: optbit = OPTBIT(IN6P_PKTINFO); break; case IPV6_HOPLIMIT: optval = OPTBIT(IN6P_HOPLIMIT); break; case IPV6_HOPOPTS: optbit = OPTBIT(IN6P_HOPOPTS); break; case IPV6_RTHDR: optbit = OPTBIT(IN6P_RTHDR); break; case IPV6_DSTOPTS: optbit = OPTBIT(IN6P_DSTOPTS|IN6P_RTHDRDSTOPTS); break; case IPV6_RTHDRDSTOPTS: /* in 2292bis only */ return(EOPNOTSUPP); } #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) error = sooptcopyout(sopt, &optval, sizeof optval); #else *mp = m = m_get(M_WAIT, MT_SOOPTS); m->m_len = sizeof(int); *mtod(m, int *) = optval; #endif /* FreeBSD3 */ #else /* new advanced API */ #if HAVE_NRL_INPCB #define in6p inp #define in6p_outputopts inp_outputopts6 #endif error = ip6_getpcbopt(in6p->in6p_outputopts, optname, &optdata, &optdatalen); if (error == 0) { #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) /* note that optdatalen maybe 0 */ error = sooptcopyout(sopt, optdata, optdatalen); #else /* !FreeBSD3 */ if (optdatalen > MCLBYTES) return(EMSGSIZE); /* XXX */ *mp = m = m_get(M_WAIT, MT_SOOPTS); if (optdatalen > MLEN) MCLGET(m, M_WAIT); m->m_len = optdatalen; bcopy(optdata, mtod(m, void *), optdatalen); #endif /* FreeBSD3 */ } #if HAVE_NRL_INPCB #undef in6p #undef in6p_outputopts #endif #endif /* COMPAT_RFC2292 */ break; case IPV6_MULTICAST_IF: case IPV6_MULTICAST_HOPS: case IPV6_MULTICAST_LOOP: case IPV6_JOIN_GROUP: case IPV6_LEAVE_GROUP: #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) { struct mbuf *m; error = ip6_getmoptions(sopt->sopt_name, in6p->in6p_moptions, &m); if (error == 0) error = sooptcopyout(sopt, mtod(m, char *), m->m_len); m_freem(m); } #elif defined(HAVE_NRL_INPCB) error = ip6_getmoptions(optname, inp->inp_moptions6, mp); #else error = ip6_getmoptions(optname, in6p->in6p_moptions, mp); #endif break; #if IPSEC case IPV6_IPSEC_POLICY: { caddr_t req = NULL; size_t len = 0; #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) struct mbuf *m = NULL; struct mbuf **mp = &m; error = sooptgetm(sopt, &m); /* XXX */ if (error != NULL) break; error = sooptmcopyin(sopt, m); /* XXX */ if (error != NULL) break; #endif if (m) { req = mtod(m, caddr_t); len = m->m_len; } #if HAVE_NRL_INPCB error = ipsec6_get_policy(inp, req, len, mp); #else error = ipsec6_get_policy(in6p, req, len, mp); #endif #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) if (error == 0) error = sooptmcopyout(sopt, m); /*XXX*/ m_freem(m); #endif break; } #endif /* IPSEC */ #if IPV6FIREWALL case IPV6_FW_GET: { #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) struct mbuf *m; struct mbuf **mp = &m; #endif if (ip6_fw_ctl_ptr == NULL) { #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined (__APPLE__) if (m) (void)m_free(m); #endif return EINVAL; } error = (*ip6_fw_ctl_ptr)(optname, mp); #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) if (error == 0) error = sooptmcopyout(sopt, m); /* XXX */ if (m) m_freem(m); #endif } break; #endif default: error = ENOPROTOOPT; break; } break; } } else { error = EINVAL; #if !(defined(__FreeBSD__) && __FreeBSD__ >= 3) && !defined(__APPLE__) if (op == PRCO_SETOPT && *mp) (void)m_free(*mp); #endif } return(error); } /* * Set up IP6 options in pcb for insertion in output packets or * specifying behavior of outgoing packets. */ static int #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) ip6_pcbopts(pktopt, m, so, sopt) #else ip6_pcbopts(pktopt, m, so) #endif struct ip6_pktopts **pktopt; register struct mbuf *m; struct socket *so; #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) struct sockopt *sopt; #endif { register struct ip6_pktopts *opt = *pktopt; int error = 0; #if defined(__FreeBSD__) && __FreeBSD__ >= 3 || defined (__APPLE__) struct proc *p = sopt->sopt_p; #else struct proc *p = curproc; /* XXX */ #endif int priv = 0; /* turn off any old options. */ if (opt) { #if DIAGNOSTIC if (opt->ip6po_pktinfo || opt->ip6po_nexthop || opt->ip6po_hbh || opt->ip6po_dest1 || opt->ip6po_dest2 || opt->ip6po_rhinfo.ip6po_rhi_rthdr) printf("ip6_pcbopts: all specified options are cleared.\n"); #endif ip6_clearpktopts(opt, 1, -1); } else opt = _MALLOC(sizeof(*opt), M_IP6OPT, M_WAITOK); *pktopt = NULL; if (!m || m->m_len == 0) { /* * Only turning off any previous options. */ if (opt) _FREE(opt, M_IP6OPT); return(0); } /* set options specified by user. */ #if 0 if (p && !suser(p->p_ucred, &p->p_acflag)) priv = 1; #endif if ((error = ip6_setpktoptions(m, opt, priv, 1)) != 0) { ip6_clearpktopts(opt, 1, -1); /* XXX: discard all options */ return(error); } *pktopt = opt; return(0); } /* * Set up an IP6 option in pcb for insertion in output packets or * specifying behavior of outgoing packets. * XXX: The logic of this function is very similar to ip6_setpktoptions(). */ static int ip6_pcbopt(optname, buf, len, pktopt, priv) int optname, len, priv; u_char *buf; struct ip6_pktopts **pktopt; { struct ip6_pktopts *opt; struct in6_pktinfo *pktinfo; if (*pktopt == NULL) { *pktopt = _MALLOC(sizeof(struct ip6_pktopts), M_IP6OPT, M_WAITOK); bzero(*pktopt, sizeof(struct ip6_pktopts)); (*pktopt)->ip6po_hlim = -1; } opt = *pktopt; switch(optname) { case IPV6_PKTINFO: if (len == 0) { /* just remove the option */ ip6_clearpktopts(opt, 1, IPV6_PKTINFO); break; } if (len != sizeof(struct in6_pktinfo)) return EINVAL; pktinfo = (struct in6_pktinfo *)buf; /* * An application can clear any sticky IPV6_PKTINFO option by * doing a "regular" setsockopt with ipi6_addr being * in6addr_any and ipi6_ifindex being zero. * [rfc2292bis-01, Section 6] * XXX: Is this a good feature?? (jinmei@kame.net) */ if (pktinfo->ipi6_ifindex == 0 && IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { ip6_clearpktopts(opt, 1, IPV6_PKTINFO); break; } /* XXX: this overrides the original data space */ if (pktinfo->ipi6_ifindex && IN6_IS_ADDR_LINKLOCAL(&pktinfo->ipi6_addr)) pktinfo->ipi6_addr.s6_addr16[1] = htons(pktinfo->ipi6_ifindex); if (pktinfo->ipi6_ifindex > if_index || pktinfo->ipi6_ifindex < 0) return(ENXIO); /* * Check if the requested source address is indeed a unicast * address assigned to the node. */ if (!IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { struct ifaddr *ia; struct sockaddr_in6 sin6; bzero(&sin6, sizeof(sin6)); sin6.sin6_len = sizeof(sin6); sin6.sin6_family = AF_INET6; sin6.sin6_addr = pktinfo->ipi6_addr; ia = ifa_ifwithaddr(sin6tosa(&sin6)); if (ia == NULL) return(EADDRNOTAVAIL); } if (opt->ip6po_pktinfo == NULL) opt->ip6po_pktinfo = _MALLOC(sizeof(struct in6_pktinfo), M_IP6OPT, M_WAITOK); bcopy(pktinfo, opt->ip6po_pktinfo, sizeof(*pktinfo)); break; case IPV6_HOPLIMIT: { int *hlimp; if (len != sizeof(int)) return(EINVAL); hlimp = (int *)buf; if (*hlimp < -1 || *hlimp > 255) return(EINVAL); opt->ip6po_hlim = *hlimp; break; } case IPV6_NEXTHOP: if (!priv) return(EPERM); if (len == 0) { /* just remove the option */ ip6_clearpktopts(opt, 1, IPV6_NEXTHOP); break; } /* check if cmsg_len is large enough for sa_len */ if (len < sizeof(u_char) || len < *buf) return(EINVAL); /* turn off the previous option */ ip6_clearpktopts(opt, 1, IPV6_NEXTHOP); opt->ip6po_nexthop = _MALLOC(*buf, M_IP6OPT, M_WAITOK); bcopy(buf, opt->ip6po_nexthop, *buf); break; case IPV6_HOPOPTS: { struct ip6_hbh *hbh; int hbhlen; /* * XXX: We don't allow a non-privileged user to set ANY HbH * options, since per-option restriction has too much * overhead. */ if (!priv) return(EPERM); if (len == 0) { ip6_clearpktopts(opt, 1, IPV6_HOPOPTS); break; /* just remove the option */ } if (len < sizeof(struct ip6_hbh)) return(EINVAL); hbh = (struct ip6_hbh *)buf; hbhlen = (hbh->ip6h_len + 1) << 3; if (len != hbhlen) return(EINVAL); /* turn off the previous option */ ip6_clearpktopts(opt, 1, IPV6_HOPOPTS); opt->ip6po_hbh = _MALLOC(hbhlen, M_IP6OPT, M_WAITOK); bcopy(buf, opt->ip6po_hbh, hbhlen); break; } case IPV6_DSTOPTS: case IPV6_RTHDRDSTOPTS: { struct ip6_dest *dest, *newdest; int destlen; if (!priv) /* XXX: see the comment for IPV6_HOPOPTS */ return(EPERM); if (len == 0) { ip6_clearpktopts(opt, 1, optname); break; /* just remove the option */ } if (len < sizeof(struct ip6_dest)) return(EINVAL); dest = (struct ip6_dest *)buf; destlen = (dest->ip6d_len + 1) << 3; if (len != destlen) return(EINVAL); /* turn off the previous option */ ip6_clearpktopts(opt, 1, optname); newdest = _MALLOC(destlen, M_IP6OPT, M_WAITOK); bcopy(buf, newdest, destlen); if (optname == IPV6_DSTOPTS) opt->ip6po_dest2 = newdest; else opt->ip6po_dest1 = newdest; break; } case IPV6_RTHDR: { struct ip6_rthdr *rth; int rthlen; if (len == 0) { ip6_clearpktopts(opt, 1, IPV6_RTHDR); break; /* just remove the option */ } if (len < sizeof(struct ip6_rthdr)) return(EINVAL); rth = (struct ip6_rthdr *)buf; rthlen = (rth->ip6r_len + 1) << 3; if (len != rthlen) return(EINVAL); switch(rth->ip6r_type) { case IPV6_RTHDR_TYPE_0: if (rth->ip6r_len == 0) /* must contain one addr */ return(EINVAL); if (rth->ip6r_len % 2) /* length must be even */ return(EINVAL); if (rth->ip6r_len / 2 != rth->ip6r_segleft) return(EINVAL); break; default: return(EINVAL); /* not supported */ } /* turn off the previous option */ ip6_clearpktopts(opt, 1, IPV6_RTHDR); opt->ip6po_rthdr = _MALLOC(rthlen, M_IP6OPT, M_WAITOK); bcopy(buf, opt->ip6po_rthdr, rthlen); break; } default: return(ENOPROTOOPT); } /* end of switch */ return(0); } static int ip6_getpcbopt(pktopt, optname, datap, datalenp) struct ip6_pktopts *pktopt; int optname, *datalenp; void **datap; { void *optdata = NULL; struct ip6_ext *ip6e; int optdatalen = 0; if (pktopt == NULL) goto end; switch(optname) { case IPV6_PKTINFO: if (pktopt->ip6po_pktinfo) { optdata = (void *)pktopt->ip6po_pktinfo; optdatalen = sizeof(struct in6_pktinfo); } break; case IPV6_HOPLIMIT: optdata = (void *)&pktopt->ip6po_hlim; optdatalen = sizeof(int); break; case IPV6_HOPOPTS: if (pktopt->ip6po_hbh) { optdata = (void *)pktopt->ip6po_hbh; ip6e = (struct ip6_ext *)pktopt->ip6po_hbh; optdatalen = (ip6e->ip6e_len + 1) << 3; } break; case IPV6_RTHDR: if (pktopt->ip6po_rthdr) { optdata = (void *)pktopt->ip6po_rthdr; ip6e = (struct ip6_ext *)pktopt->ip6po_rthdr; optdatalen = (ip6e->ip6e_len + 1) << 3; } break; case IPV6_RTHDRDSTOPTS: if (pktopt->ip6po_dest1) { optdata = (void *)pktopt->ip6po_dest1; ip6e = (struct ip6_ext *)pktopt->ip6po_dest1; optdatalen = (ip6e->ip6e_len + 1) << 3; } break; case IPV6_DSTOPTS: if (pktopt->ip6po_dest2) { optdata = (void *)pktopt->ip6po_dest2; ip6e = (struct ip6_ext *)pktopt->ip6po_dest2; optdatalen = (ip6e->ip6e_len + 1) << 3; } break; } end: *datap = optdata; *datalenp = optdatalen; return(0); } void ip6_clearpktopts(pktopt, needfree, optname) struct ip6_pktopts *pktopt; int needfree, optname; { if (pktopt == NULL) return; if (optname == -1 || optname == IPV6_PKTINFO) { if (needfree && pktopt->ip6po_pktinfo) _FREE(pktopt->ip6po_pktinfo, M_IP6OPT); pktopt->ip6po_pktinfo = NULL; } if (optname == -1 || optname == IPV6_HOPLIMIT) pktopt->ip6po_hlim = -1; if (optname == -1 || optname == IPV6_NEXTHOP) { if (needfree && pktopt->ip6po_nexthop) _FREE(pktopt->ip6po_nexthop, M_IP6OPT); pktopt->ip6po_nexthop = NULL; } if (optname == -1 || optname == IPV6_HOPOPTS) { if (needfree && pktopt->ip6po_hbh) _FREE(pktopt->ip6po_hbh, M_IP6OPT); pktopt->ip6po_hbh = NULL; } if (optname == -1 || optname == IPV6_RTHDRDSTOPTS) { if (needfree && pktopt->ip6po_dest1) _FREE(pktopt->ip6po_dest1, M_IP6OPT); pktopt->ip6po_dest1 = NULL; } if (optname == -1 || optname == IPV6_RTHDR) { if (needfree && pktopt->ip6po_rhinfo.ip6po_rhi_rthdr) _FREE(pktopt->ip6po_rhinfo.ip6po_rhi_rthdr, M_IP6OPT); pktopt->ip6po_rhinfo.ip6po_rhi_rthdr = NULL; if (pktopt->ip6po_route.ro_rt) { RTFREE(pktopt->ip6po_route.ro_rt); pktopt->ip6po_route.ro_rt = NULL; } } if (optname == -1 || optname == IPV6_DSTOPTS) { if (needfree && pktopt->ip6po_dest2) _FREE(pktopt->ip6po_dest2, M_IP6OPT); pktopt->ip6po_dest2 = NULL; } } #define PKTOPT_EXTHDRCPY(type) if (src->type) {\ int hlen =\ (((struct ip6_ext *)src->type)->ip6e_len + 1) << 3;\ dst->type = _MALLOC(hlen, M_IP6OPT, canwait);\ if (dst->type == NULL && canwait == M_NOWAIT)\ goto bad;\ bcopy(src->type, dst->type, hlen);\ } struct ip6_pktopts * ip6_copypktopts(src, canwait) struct ip6_pktopts *src; int canwait; { struct ip6_pktopts *dst; if (src == NULL) { printf("ip6_clearpktopts: invalid argument\n"); return(NULL); } dst = _MALLOC(sizeof(*dst), M_IP6OPT, canwait); if (dst == NULL && canwait == M_NOWAIT) goto bad; bzero(dst, sizeof(*dst)); dst->ip6po_hlim = src->ip6po_hlim; dst->ip6po_flags = src->ip6po_flags; if (src->ip6po_pktinfo) { dst->ip6po_pktinfo = _MALLOC(sizeof(*dst->ip6po_pktinfo), M_IP6OPT, canwait); if (dst->ip6po_pktinfo == NULL && canwait == M_NOWAIT) goto bad; *dst->ip6po_pktinfo = *src->ip6po_pktinfo; } if (src->ip6po_nexthop) { dst->ip6po_nexthop = _MALLOC(src->ip6po_nexthop->sa_len, M_IP6OPT, canwait); if (dst->ip6po_nexthop == NULL && canwait == M_NOWAIT) goto bad; bcopy(src->ip6po_nexthop, dst->ip6po_nexthop, src->ip6po_nexthop->sa_len); } PKTOPT_EXTHDRCPY(ip6po_hbh); PKTOPT_EXTHDRCPY(ip6po_dest1); PKTOPT_EXTHDRCPY(ip6po_dest2); PKTOPT_EXTHDRCPY(ip6po_rthdr); /* not copy the cached route */ return(dst); bad: printf("ip6_copypktopts: copy failed"); if (dst->ip6po_pktinfo) _FREE(dst->ip6po_pktinfo, M_IP6OPT); if (dst->ip6po_nexthop) _FREE(dst->ip6po_nexthop, M_IP6OPT); if (dst->ip6po_hbh) _FREE(dst->ip6po_hbh, M_IP6OPT); if (dst->ip6po_dest1) _FREE(dst->ip6po_dest1, M_IP6OPT); if (dst->ip6po_dest2) _FREE(dst->ip6po_dest2, M_IP6OPT); if (dst->ip6po_rthdr) _FREE(dst->ip6po_rthdr, M_IP6OPT); return(NULL); } #undef PKTOPT_EXTHDRCPY void ip6_freepcbopts(pktopt) struct ip6_pktopts *pktopt; { if (pktopt == NULL) return; ip6_clearpktopts(pktopt, 1, -1); _FREE(pktopt, M_IP6OPT); } /* * Set the IP6 multicast options in response to user setsockopt(). */ static int ip6_setmoptions(optname, im6op, m) int optname; struct ip6_moptions **im6op; struct mbuf *m; { int error = 0; u_int loop, ifindex; struct ipv6_mreq *mreq; struct ifnet *ifp; struct ip6_moptions *im6o = *im6op; struct route_in6 ro; struct sockaddr_in6 *dst; struct in6_multi_mship *imm; struct proc *p = current_proc(); /* ### */ if (im6o == NULL) { /* * No multicast option buffer attached to the pcb; * allocate one and initialize to default values. */ im6o = (struct ip6_moptions *) _MALLOC(sizeof(*im6o), M_IPMOPTS, M_WAITOK); if (im6o == NULL) return(ENOBUFS); *im6op = im6o; im6o->im6o_multicast_ifp = NULL; im6o->im6o_multicast_hlim = ip6_defmcasthlim; im6o->im6o_multicast_loop = IPV6_DEFAULT_MULTICAST_LOOP; LIST_INIT(&im6o->im6o_memberships); } switch (optname) { case IPV6_MULTICAST_IF: /* * Select the interface for outgoing multicast packets. */ if (m == NULL || m->m_len != sizeof(u_int)) { error = EINVAL; break; } ifindex = *(mtod(m, u_int *)); if (ifindex < 0 || if_index < ifindex) { error = ENXIO; /* XXX EINVAL? */ break; } ifp = ifindex2ifnet[ifindex]; if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { error = EADDRNOTAVAIL; break; } im6o->im6o_multicast_ifp = ifp; break; case IPV6_MULTICAST_HOPS: { /* * Set the IP6 hoplimit for outgoing multicast packets. */ int optval; if (m == NULL || m->m_len != sizeof(int)) { error = EINVAL; break; } optval = *(mtod(m, u_int *)); if (optval < -1 || optval >= 256) error = EINVAL; else if (optval == -1) im6o->im6o_multicast_hlim = ip6_defmcasthlim; else im6o->im6o_multicast_hlim = optval; break; } case IPV6_MULTICAST_LOOP: /* * Set the loopback flag for outgoing multicast packets. * Must be zero or one. */ if (m == NULL || m->m_len != sizeof(u_int) || (loop = *(mtod(m, u_int *))) > 1) { error = EINVAL; break; } im6o->im6o_multicast_loop = loop; break; case IPV6_JOIN_GROUP: /* * Add a multicast group membership. * Group must be a valid IP6 multicast address. */ if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { error = EINVAL; break; } mreq = mtod(m, struct ipv6_mreq *); if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { /* * We use the unspecified address to specify to accept * all multicast addresses. Only super user is allowed * to do this. */ #if ISFB31 if (suser(p->p_ucred, &p->p_acflag)) { error = EACCES; break; } #endif } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { error = EINVAL; break; } /* * If the interface is specified, validate it. */ if (mreq->ipv6mr_interface < 0 || if_index < mreq->ipv6mr_interface) { error = ENXIO; /* XXX EINVAL? */ break; } /* * If no interface was explicitly specified, choose an * appropriate one according to the given multicast address. */ if (mreq->ipv6mr_interface == 0) { /* * If the multicast address is in node-local scope, * the interface should be a loopback interface. * Otherwise, look up the routing table for the * address, and choose the outgoing interface. * XXX: is it a good approach? */ if (IN6_IS_ADDR_MC_NODELOCAL(&mreq->ipv6mr_multiaddr)) { #ifdef __bsdi__ ifp = loifp; #else ifp = &loif[0]; #endif } else { ro.ro_rt = NULL; dst = (struct sockaddr_in6 *)&ro.ro_dst; bzero(dst, sizeof(*dst)); dst->sin6_len = sizeof(struct sockaddr_in6); dst->sin6_family = AF_INET6; dst->sin6_addr = mreq->ipv6mr_multiaddr; rtalloc((struct route *)&ro); if (ro.ro_rt == NULL) { error = EADDRNOTAVAIL; break; } ifp = ro.ro_rt->rt_ifp; rtfree(ro.ro_rt); } } else ifp = ifindex2ifnet[mreq->ipv6mr_interface]; /* * See if we found an interface, and confirm that it * supports multicast */ if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) { error = EADDRNOTAVAIL; break; } /* * Put interface index into the multicast address, * if the address has link-local scope. */ if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { mreq->ipv6mr_multiaddr.s6_addr16[1] = htons(mreq->ipv6mr_interface); } /* * See if the membership already exists. */ for (imm = im6o->im6o_memberships.lh_first; imm != NULL; imm = imm->i6mm_chain.le_next) if (imm->i6mm_maddr->in6m_ifp == ifp && IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, &mreq->ipv6mr_multiaddr)) break; if (imm != NULL) { error = EADDRINUSE; break; } /* * Everything looks good; add a new record to the multicast * address list for the given interface. */ imm = _MALLOC(sizeof(*imm), M_IPMADDR, M_WAITOK); if (imm == NULL) { error = ENOBUFS; break; } if ((imm->i6mm_maddr = in6_addmulti(&mreq->ipv6mr_multiaddr, ifp, &error)) == NULL) { _FREE(imm, M_IPMADDR); break; } LIST_INSERT_HEAD(&im6o->im6o_memberships, imm, i6mm_chain); break; case IPV6_LEAVE_GROUP: /* * Drop a multicast group membership. * Group must be a valid IP6 multicast address. */ if (m == NULL || m->m_len != sizeof(struct ipv6_mreq)) { error = EINVAL; break; } mreq = mtod(m, struct ipv6_mreq *); if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { if (suser(p->p_ucred, &p->p_acflag)) { error = EACCES; break; } } else if (!IN6_IS_ADDR_MULTICAST(&mreq->ipv6mr_multiaddr)) { error = EINVAL; break; } /* * If an interface address was specified, get a pointer * to its ifnet structure. */ if (mreq->ipv6mr_interface < 0 || if_index < mreq->ipv6mr_interface) { error = ENXIO; /* XXX EINVAL? */ break; } ifp = ifindex2ifnet[mreq->ipv6mr_interface]; /* * Put interface index into the multicast address, * if the address has link-local scope. */ if (IN6_IS_ADDR_MC_LINKLOCAL(&mreq->ipv6mr_multiaddr)) { mreq->ipv6mr_multiaddr.s6_addr16[1] = htons(mreq->ipv6mr_interface); } /* * Find the membership in the membership list. */ for (imm = im6o->im6o_memberships.lh_first; imm != NULL; imm = imm->i6mm_chain.le_next) { if ((ifp == NULL || imm->i6mm_maddr->in6m_ifp == ifp) && IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr, &mreq->ipv6mr_multiaddr)) break; } if (imm == NULL) { /* Unable to resolve interface */ error = EADDRNOTAVAIL; break; } /* * Give up the multicast address record to which the * membership points. */ LIST_REMOVE(imm, i6mm_chain); in6_delmulti(imm->i6mm_maddr); _FREE(imm, M_IPMADDR); break; default: error = EOPNOTSUPP; break; } /* * If all options have default values, no need to keep the mbuf. */ if (im6o->im6o_multicast_ifp == NULL && im6o->im6o_multicast_hlim == ip6_defmcasthlim && im6o->im6o_multicast_loop == IPV6_DEFAULT_MULTICAST_LOOP && im6o->im6o_memberships.lh_first == NULL) { _FREE(*im6op, M_IPMOPTS); *im6op = NULL; } return(error); } /* * Return the IP6 multicast options in response to user getsockopt(). */ static int ip6_getmoptions(optname, im6o, mp) int optname; register struct ip6_moptions *im6o; register struct mbuf **mp; { u_int *hlim, *loop, *ifindex; #if __FreeBSD__ || defined (__APPLE__) *mp = m_get(M_WAIT, MT_HEADER); /*XXX*/ #else *mp = m_get(M_WAIT, MT_SOOPTS); #endif switch (optname) { case IPV6_MULTICAST_IF: ifindex = mtod(*mp, u_int *); (*mp)->m_len = sizeof(u_int); if (im6o == NULL || im6o->im6o_multicast_ifp == NULL) *ifindex = 0; else *ifindex = im6o->im6o_multicast_ifp->if_index; return(0); case IPV6_MULTICAST_HOPS: hlim = mtod(*mp, u_int *); (*mp)->m_len = sizeof(u_int); if (im6o == NULL) *hlim = ip6_defmcasthlim; else *hlim = im6o->im6o_multicast_hlim; return(0); case IPV6_MULTICAST_LOOP: loop = mtod(*mp, u_int *); (*mp)->m_len = sizeof(u_int); if (im6o == NULL) *loop = ip6_defmcasthlim; else *loop = im6o->im6o_multicast_loop; return(0); default: return(EOPNOTSUPP); } } /* * Discard the IP6 multicast options. */ void ip6_freemoptions(im6o) register struct ip6_moptions *im6o; { struct in6_multi_mship *imm; if (im6o == NULL) return; while ((imm = im6o->im6o_memberships.lh_first) != NULL) { LIST_REMOVE(imm, i6mm_chain); if (imm->i6mm_maddr) in6_delmulti(imm->i6mm_maddr); _FREE(imm, M_IPMADDR); } _FREE(im6o, M_IPMOPTS); } /* * Set IPv6 outgoing packet options based on advanced API. */ int ip6_setpktoptions(control, opt, priv, needcopy) struct mbuf *control; struct ip6_pktopts *opt; int priv, needcopy; { register struct cmsghdr *cm = 0; if (control == 0 || opt == 0) return(EINVAL); bzero(opt, sizeof(*opt)); opt->ip6po_hlim = -1; /* -1 means to use default hop limit */ /* * XXX: Currently, we assume all the optional information is stored * in a single mbuf. */ if (control->m_next) return(EINVAL); for (; control->m_len; control->m_data += CMSG_ALIGN(cm->cmsg_len), control->m_len -= CMSG_ALIGN(cm->cmsg_len)) { cm = mtod(control, struct cmsghdr *); if (cm->cmsg_len == 0 || cm->cmsg_len > control->m_len) return(EINVAL); if (cm->cmsg_level != IPPROTO_IPV6) continue; switch(cm->cmsg_type) { case IPV6_PKTINFO: if (cm->cmsg_len != CMSG_LEN(sizeof(struct in6_pktinfo))) return(EINVAL); if (needcopy) { /* XXX: Is it really WAITOK? */ opt->ip6po_pktinfo = _MALLOC(sizeof(struct in6_pktinfo), M_IP6OPT, M_WAITOK); *opt->ip6po_pktinfo = *(struct in6_pktinfo *)CMSG_DATA(cm); } else opt->ip6po_pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); if (opt->ip6po_pktinfo->ipi6_ifindex && IN6_IS_ADDR_LINKLOCAL(&opt->ip6po_pktinfo->ipi6_addr)) opt->ip6po_pktinfo->ipi6_addr.s6_addr16[1] = htons(opt->ip6po_pktinfo->ipi6_ifindex); if (opt->ip6po_pktinfo->ipi6_ifindex > if_index || opt->ip6po_pktinfo->ipi6_ifindex < 0) { return(ENXIO); } /* * Check if the requested source address is indeed a * unicast address assigned to the node. */ if (!IN6_IS_ADDR_UNSPECIFIED(&opt->ip6po_pktinfo->ipi6_addr)) { struct ifaddr *ia; struct sockaddr_in6 sin6; bzero(&sin6, sizeof(sin6)); sin6.sin6_len = sizeof(sin6); sin6.sin6_family = AF_INET6; sin6.sin6_addr = opt->ip6po_pktinfo->ipi6_addr; ia = ifa_ifwithaddr(sin6tosa(&sin6)); if (ia == NULL) return(EADDRNOTAVAIL); } break; case IPV6_HOPLIMIT: if (cm->cmsg_len != CMSG_LEN(sizeof(int))) return(EINVAL); opt->ip6po_hlim = *(int *)CMSG_DATA(cm); if (opt->ip6po_hlim < -1 || opt->ip6po_hlim > 255) return(EINVAL); break; case IPV6_NEXTHOP: if (!priv) return(EPERM); if (cm->cmsg_len < sizeof(u_char) || /* check if cmsg_len is large enough for sa_len */ cm->cmsg_len < CMSG_LEN(*CMSG_DATA(cm))) return(EINVAL); if (needcopy) { opt->ip6po_nexthop = _MALLOC(*CMSG_DATA(cm), M_IP6OPT, M_WAITOK); bcopy(CMSG_DATA(cm), opt->ip6po_nexthop, *CMSG_DATA(cm)); } else opt->ip6po_nexthop = (struct sockaddr *)CMSG_DATA(cm); break; case IPV6_HOPOPTS: { struct ip6_hbh *hbh; int hbhlen; if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_hbh))) return(EINVAL); hbh = (struct ip6_hbh *)CMSG_DATA(cm); hbhlen = (hbh->ip6h_len + 1) << 3; if (cm->cmsg_len != CMSG_LEN(hbhlen)) return(EINVAL); if (needcopy) { opt->ip6po_hbh = _MALLOC(hbhlen, M_IP6OPT, M_WAITOK); bcopy(hbh, opt->ip6po_hbh, hbhlen); } else opt->ip6po_hbh = hbh; break; } case IPV6_DSTOPTS: { struct ip6_dest *dest; int destlen; if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_dest))) return(EINVAL); dest = (struct ip6_dest *)CMSG_DATA(cm); destlen = (dest->ip6d_len + 1) << 3; if (cm->cmsg_len != CMSG_LEN(destlen)) return(EINVAL); /* * If there is no routing header yet, the destination * options header should be put on the 1st part. * Otherwise, the header should be on the 2nd part. * (See RFC 2460, section 4.1) */ if (opt->ip6po_rthdr == NULL) { if (needcopy) { opt->ip6po_dest1 = _MALLOC(destlen, M_IP6OPT, M_WAITOK); bcopy(dest, opt->ip6po_dest1, destlen); } else opt->ip6po_dest1 = dest; } else { if (needcopy) { opt->ip6po_dest2 = _MALLOC(destlen, M_IP6OPT, M_WAITOK); bcopy(dest, opt->ip6po_dest2, destlen); } else opt->ip6po_dest2 = dest; } break; } case IPV6_RTHDR: { struct ip6_rthdr *rth; int rthlen; if (cm->cmsg_len < CMSG_LEN(sizeof(struct ip6_rthdr))) return(EINVAL); rth = (struct ip6_rthdr *)CMSG_DATA(cm); rthlen = (rth->ip6r_len + 1) << 3; if (cm->cmsg_len != CMSG_LEN(rthlen)) return(EINVAL); switch(rth->ip6r_type) { case IPV6_RTHDR_TYPE_0: /* must contain one addr */ if (rth->ip6r_len == 0) return(EINVAL); /* length must be even */ if (rth->ip6r_len % 2) return(EINVAL); if (rth->ip6r_len / 2 != rth->ip6r_segleft) return(EINVAL); break; default: return(EINVAL); /* not supported */ } if (needcopy) { opt->ip6po_rthdr = _MALLOC(rthlen, M_IP6OPT, M_WAITOK); bcopy(rth, opt->ip6po_rthdr, rthlen); } else opt->ip6po_rthdr = rth; break; } case IPV6_REACHCONF: #if 1 /* * it looks dangerous to allow IPV6_REACHCONF to * normal user. it affects the ND state (system state) * and can affect communication by others - jinmei */ if (!priv) return(EPERM); #endif if (cm->cmsg_len != CMSG_LEN(0)) return(EINVAL); opt->ip6po_flags |= IP6PO_REACHCONF; break; case IPV6_USE_MIN_MTU: if (cm->cmsg_len != CMSG_LEN(0)) return(EINVAL); opt->ip6po_flags |= IP6PO_MINMTU; break; default: return(ENOPROTOOPT); } } return(0); } /* * Routine called from ip6_output() to loop back a copy of an IP6 multicast * packet to the input queue of a specified interface. Note that this * calls the output routine of the loopback "driver", but with an interface * pointer that might NOT be &loif -- easier than replicating that code here. */ void ip6_mloopback(ifp, m, dst) struct ifnet *ifp; register struct mbuf *m; register struct sockaddr_in6 *dst; { struct mbuf *copym; copym = m_copy(m, 0, M_COPYALL); if (copym != NULL) { #ifdef __APPLE__ /* * TedW: * We need to send all loopback traffic down to dlil in case * a filter has tapped-in. */ if (lo_dl_tag == 0) dlil_find_dltag(APPLE_IF_FAM_LOOPBACK, 0, PF_INET6, &lo_dl_tag); if (lo_dl_tag) dlil_output(lo_dl_tag, copym, 0, (struct sockaddr *) dst, 0); else { printf("Warning: ip6_mloopback call to dlil_find_dltag failed!\n"); m_freem(copym); } #else (void)if_simloop(ifp, copym, (struct sockaddr *)dst, NULL); (void)looutput(ifp, copym, (struct sockaddr *)dst, NULL); #endif } } /* * Chop IPv6 header off from the payload. */ static int ip6_splithdr(m, exthdrs) struct mbuf *m; struct ip6_exthdrs *exthdrs; { struct mbuf *mh; struct ip6_hdr *ip6; ip6 = mtod(m, struct ip6_hdr *); if (m->m_len > sizeof(*ip6)) { MGETHDR(mh, M_DONTWAIT, MT_HEADER); if (mh == 0) { m_freem(m); return ENOBUFS; } M_COPY_PKTHDR(mh, m); MH_ALIGN(mh, sizeof(*ip6)); m->m_flags &= ~M_PKTHDR; m->m_len -= sizeof(*ip6); m->m_data += sizeof(*ip6); mh->m_next = m; m = mh; m->m_len = sizeof(*ip6); bcopy((caddr_t)ip6, mtod(m, caddr_t), sizeof(*ip6)); } exthdrs->ip6e_ip6 = m; return 0; } /* * Compute IPv6 extension header length. */ #if HAVE_NRL_INPCB # define in6pcb inpcb # define in6p_outputopts inp_outputopts6 #endif int ip6_optlen(in6p) struct in6pcb *in6p; { int len; if (!in6p->in6p_outputopts) return 0; len = 0; #define elen(x) \ (((struct ip6_ext *)(x)) ? (((struct ip6_ext *)(x))->ip6e_len + 1) << 3 : 0) len += elen(in6p->in6p_outputopts->ip6po_hbh); if (in6p->in6p_outputopts->ip6po_rthdr) /* dest1 is valid with rthdr only */ len += elen(in6p->in6p_outputopts->ip6po_dest1); len += elen(in6p->in6p_outputopts->ip6po_rthdr); len += elen(in6p->in6p_outputopts->ip6po_dest2); return len; #undef elen } #if HAVE_NRL_INPCB # undef in6pcb # undef in6p_outputopts #endif