/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (C) 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. * * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ */ /*- * Copyright (c) 1989 Stephen Deering * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Stephen Deering of Stanford University. * * 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. * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp */ /* * IP multicast forwarding procedures * * Written by David Waitzman, BBN Labs, August 1988. * Modified by Steve Deering, Stanford, February 1989. * Modified by Mark J. Steiglitz, Stanford, May, 1991 * Modified by Van Jacobson, LBL, January 1993 * Modified by Ajit Thyagarajan, PARC, August 1993 * Modified by Bill Fenner, PARC, April 1994 * * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support */ #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 #include #include #include #include #include #include #include #include #include #include #include #include #include static MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); struct mf6ctable; static int ip6_mdq(struct mf6ctable *, struct mbuf *, struct ifnet *, struct mf6c *); static void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); static int register_send(struct mf6ctable *, struct ip6_hdr *, mifi_t, struct mbuf *); static int set_pim6(int *); static int socket_send(struct socket *, struct mbuf *, struct sockaddr_in6 *); extern int in6_mcast_loop; extern struct domain inet6domain; static const struct encaptab *pim6_encap_cookie; static int pim6_encapcheck(const struct mbuf *, int, int, void *); static int pim6_input(struct mbuf *, int, int, void *); static const struct encap_config ipv6_encap_cfg = { .proto = IPPROTO_PIM, .min_length = sizeof(struct ip6_hdr) + PIM_MINLEN, .exact_match = 8, .check = pim6_encapcheck, .input = pim6_input }; SYSCTL_DECL(_net_inet6); SYSCTL_DECL(_net_inet6_ip6); static SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, "PIM"); VNET_DEFINE_STATIC(struct mrt6stat, mrt6stat); #define V_mrt6stat VNET(mrt6stat) SYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(mrt6stat), mrt6stat, "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); #define MRT6STAT_INC(name) V_mrt6stat.name += 1 #define NO_RTE_FOUND 0x1 #define RTE_FOUND 0x2 static struct sx mrouter6_mtx; #define MROUTER6_LOCKPTR() (&mrouter6_mtx) #define MROUTER6_LOCK() sx_xlock(MROUTER6_LOCKPTR()) #define MROUTER6_UNLOCK() sx_xunlock(MROUTER6_LOCKPTR()) #define MROUTER6_LOCK_ASSERT() sx_assert(MROUTER6_LOCKPTR(), SA_XLOCKED #define MROUTER6_LOCK_INIT() sx_init(MROUTER6_LOCKPTR(), "mrouter6") #define MROUTER6_LOCK_DESTROY() sx_destroy(MROUTER6_LOCKPTR()) static struct mtx mfc6_mtx; #define MFC6_LOCKPTR() (&mfc6_mtx) #define MFC6_LOCK() mtx_lock(MFC6_LOCKPTR()) #define MFC6_UNLOCK() mtx_unlock(MFC6_LOCKPTR()) #define MFC6_LOCK_ASSERT() mtx_assert(MFC6_LOCKPTR(), MA_OWNED) #define MFC6_LOCK_INIT() mtx_init(MFC6_LOCKPTR(), \ "IPv6 multicast forwarding cache", \ NULL, MTX_DEF) #define MFC6_LOCK_DESTROY() mtx_destroy(MFC6_LOCKPTR()) struct mf6ctable { struct socket *router; int router_ver; struct mf6c *mfchashtbl[MF6CTBLSIZ]; u_char nexpire[MF6CTBLSIZ]; int nummifs; struct mif6 miftable[MAXMIFS]; /* * 'Interfaces' associated with decapsulator (so we can tell packets * that went through it from ones that get reflected by a broken * gateway). Different from IPv4 register_if, these interfaces are * linked into the system ifnet list, because per-interface IPv6 * statistics are maintained in ifp->if_afdata. But it does not have * any routes point to them. I.e., packets can't be sent this way. * They only exist as a placeholder for multicast source verification. */ struct ifnet *register_if; mifi_t register_mif; }; VNET_DEFINE_STATIC(struct mf6ctable *, mfctables); #define V_mfctables VNET(mfctables) VNET_DEFINE_STATIC(uint32_t, nmfctables); #define V_nmfctables VNET(nmfctables) static eventhandler_tag ifdetach_tag, rtnumfibs_change_tag; static int sysctl_mfctable(SYSCTL_HANDLER_ARGS) { int fibnum; fibnum = curthread->td_proc->p_fibnum; return (SYSCTL_OUT(req, &V_mfctables[fibnum].mfchashtbl, sizeof(struct mf6c *) * MF6CTBLSIZ)); } SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLTYPE_OPAQUE | CTLFLAG_RD, NULL, 0, sysctl_mfctable, "S,*mf6c[MF6CTBLSIZ]", "IPv6 Multicast Forwarding Table (struct mf6c *[MF6CTBLSIZ], " "netinet6/ip6_mroute.h)"); static int sysctl_mif6table(SYSCTL_HANDLER_ARGS) { struct mif6_sctl *out; struct mf6ctable *mfct; int error; mfct = &V_mfctables[curthread->td_proc->p_fibnum]; out = malloc(sizeof(struct mif6_sctl) * MAXMIFS, M_TEMP, M_WAITOK | M_ZERO); for (int i = 0; i < MAXMIFS; i++) { struct mif6_sctl *outp = &out[i]; struct mif6 *mifp = &mfct->miftable[i]; outp->m6_flags = mifp->m6_flags; outp->m6_rate_limit = mifp->m6_rate_limit; outp->m6_lcl_addr = mifp->m6_lcl_addr; if (mifp->m6_ifp != NULL) outp->m6_ifp = mifp->m6_ifp->if_index; else outp->m6_ifp = 0; outp->m6_pkt_in = mifp->m6_pkt_in; outp->m6_pkt_out = mifp->m6_pkt_out; outp->m6_bytes_in = mifp->m6_bytes_in; outp->m6_bytes_out = mifp->m6_bytes_out; } error = SYSCTL_OUT(req, out, sizeof(struct mif6_sctl) * MAXMIFS); free(out, M_TEMP); return (error); } SYSCTL_PROC(_net_inet6_ip6, OID_AUTO, mif6table, CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT, NULL, 0, sysctl_mif6table, "S,mif6_sctl[MAXMIFS]", "IPv6 Multicast Interfaces (struct mif6_sctl[MAXMIFS], " "netinet6/ip6_mroute.h)"); static struct mtx mif6_mtx; #define MIF6_LOCKPTR() (&mif6_mtx) #define MIF6_LOCK() mtx_lock(MIF6_LOCKPTR()) #define MIF6_UNLOCK() mtx_unlock(MIF6_LOCKPTR()) #define MIF6_LOCK_ASSERT() mtx_assert(MIF6_LOCKPTR(), MA_OWNED) #define MIF6_LOCK_INIT() \ mtx_init(MIF6_LOCKPTR(), "IPv6 multicast interfaces", NULL, MTX_DEF) #define MIF6_LOCK_DESTROY() mtx_destroy(MIF6_LOCKPTR()) #ifdef MRT6DEBUG VNET_DEFINE_STATIC(u_int, mrt6debug) = 0; /* debug level */ #define V_mrt6debug VNET(mrt6debug) #define DEBUG_MFC 0x02 #define DEBUG_FORWARD 0x04 #define DEBUG_EXPIRE 0x08 #define DEBUG_XMIT 0x10 #define DEBUG_REG 0x20 #define DEBUG_PIM 0x40 #define DEBUG_ERR 0x80 #define DEBUG_ANY 0x7f #define MRT6_DLOG(m, fmt, ...) \ if (V_mrt6debug & (m)) \ log(((m) & DEBUG_ERR) ? LOG_ERR: LOG_DEBUG, \ "%s: " fmt "\n", __func__, ##__VA_ARGS__) #else #define MRT6_DLOG(m, fmt, ...) #endif static void expire_upcalls(struct mf6ctable *); static void expire_upcalls_all(void *); #define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ #define UPCALL_EXPIRE 6 /* number of timeouts */ VNET_DEFINE_STATIC(struct pim6stat, pim6stat); #define V_pim6stat VNET(pim6stat) SYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(pim6stat), pim6stat, "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); #define PIM6STAT_INC(name) V_pim6stat.name += 1 VNET_DEFINE_STATIC(int, pim6); #define V_pim6 VNET(pim6) /* * Hash function for a source, group entry */ #define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ (g).s6_addr32[2] ^ (g).s6_addr32[3]) /* * Macros to compute elapsed time efficiently * Borrowed from Van Jacobson's scheduling code * XXX: replace with timersub() ? */ #define TV_DELTA(a, b, delta) do { \ int xxs; \ \ delta = (a).tv_usec - (b).tv_usec; \ if ((xxs = (a).tv_sec - (b).tv_sec)) { \ switch (xxs) { \ case 2: \ delta += 1000000; \ /* FALLTHROUGH */ \ case 1: \ delta += 1000000; \ break; \ default: \ delta += (1000000 * xxs); \ } \ } \ } while (/*CONSTCOND*/ 0) /* XXX: replace with timercmp(a, b, <) ? */ #define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) #ifdef UPCALL_TIMING #define UPCALL_MAX 50 static u_long upcall_data[UPCALL_MAX + 1]; static void collate(struct timeval *); #endif /* UPCALL_TIMING */ static int ip6_mrouter_init(struct socket *, int, int); static int add_m6fc(struct mf6ctable *, struct mf6cctl *); static int add_m6if(struct mf6ctable *, int, struct mif6ctl *); static int del_m6fc(struct mf6ctable *, struct mf6cctl *); static int del_m6if(struct mf6ctable *, mifi_t); static int del_m6if_locked(struct mf6ctable *, mifi_t); static int get_mif6_cnt(struct mf6ctable *, struct sioc_mif_req6 *); static int get_sg_cnt(struct mf6ctable *, struct sioc_sg_req6 *); VNET_DEFINE_STATIC(struct callout, expire_upcalls_ch); #define V_expire_upcalls_ch VNET(expire_upcalls_ch) static int X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); static void X_ip6_mrouter_done(struct socket *); static int X_ip6_mrouter_set(struct socket *, struct sockopt *); static int X_ip6_mrouter_get(struct socket *, struct sockopt *); static int X_mrt6_ioctl(u_long, caddr_t, int); static struct mf6c * mf6c_find(const struct mf6ctable *mfct, const struct in6_addr *origin, const struct in6_addr *group) { MFC6_LOCK_ASSERT(); for (struct mf6c *rt = mfct->mfchashtbl[MF6CHASH(*origin, *group)]; rt != NULL; rt = rt->mf6c_next) { if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, origin) && IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, group) && rt->mf6c_stall == NULL) return (rt); } MRT6STAT_INC(mrt6s_mfc_misses); return (NULL); } static struct mf6ctable * somfctable(struct socket *so) { int fib; fib = atomic_load_int(&so->so_fibnum); KASSERT(fib >= 0 && fib < V_nmfctables, ("%s: so_fibnum %d out of range", __func__, fib)); return (&V_mfctables[fib]); } /* * Handle MRT setsockopt commands to modify the multicast routing tables. */ static int X_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) { struct mf6ctable *mfct; int error = 0; int optval; struct mif6ctl mifc; struct mf6cctl mfcc; mifi_t mifi; mfct = somfctable(so); if (so != mfct->router && sopt->sopt_name != MRT6_INIT) return (EPERM); switch (sopt->sopt_name) { case MRT6_INIT: #ifdef MRT6_OINIT case MRT6_OINIT: #endif error = sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval)); if (error) break; error = ip6_mrouter_init(so, optval, sopt->sopt_name); break; case MRT6_DONE: X_ip6_mrouter_done(so); break; case MRT6_ADD_MIF: error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); if (error) break; error = add_m6if(mfct, so->so_fibnum, &mifc); break; case MRT6_ADD_MFC: error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); if (error) break; error = add_m6fc(mfct, &mfcc); break; case MRT6_DEL_MFC: error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); if (error) break; error = del_m6fc(mfct, &mfcc); break; case MRT6_DEL_MIF: error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); if (error) break; error = del_m6if(mfct, mifi); break; case MRT6_PIM: error = sooptcopyin(sopt, &optval, sizeof(optval), sizeof(optval)); if (error) break; error = set_pim6(&optval); break; default: error = EOPNOTSUPP; break; } return (error); } /* * Handle MRT getsockopt commands */ static int X_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) { struct mf6ctable *mfct; int error = 0; mfct = somfctable(so); if (so != mfct->router) return (EACCES); switch (sopt->sopt_name) { case MRT6_PIM: error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); break; } return (error); } /* * Handle ioctl commands to obtain information from the cache */ static int X_mrt6_ioctl(u_long cmd, caddr_t data, int fibnum) { struct mf6ctable *mfct; int error; error = priv_check(curthread, PRIV_NETINET_MROUTE); if (error) return (error); mfct = &V_mfctables[fibnum]; switch (cmd) { case SIOCGETSGCNT_IN6: error = get_sg_cnt(mfct, (struct sioc_sg_req6 *)data); break; case SIOCGETMIFCNT_IN6: error = get_mif6_cnt(mfct, (struct sioc_mif_req6 *)data); break; default: error = EINVAL; break; } return (error); } /* * returns the packet, byte, rpf-failure count for the source group provided */ static int get_sg_cnt(struct mf6ctable *mfct, struct sioc_sg_req6 *req) { struct mf6c *rt; int ret; ret = 0; MFC6_LOCK(); rt = mf6c_find(mfct, &req->src.sin6_addr, &req->grp.sin6_addr); if (rt == NULL) { ret = ESRCH; } else { req->pktcnt = rt->mf6c_pkt_cnt; req->bytecnt = rt->mf6c_byte_cnt; req->wrong_if = rt->mf6c_wrong_if; } MFC6_UNLOCK(); return (ret); } /* * returns the input and output packet and byte counts on the mif provided */ static int get_mif6_cnt(struct mf6ctable *mfct, struct sioc_mif_req6 *req) { mifi_t mifi; int ret; ret = 0; mifi = req->mifi; MIF6_LOCK(); if (mifi >= mfct->nummifs) { ret = EINVAL; } else { struct mif6 *mif = &mfct->miftable[mifi]; req->icount = mif->m6_pkt_in; req->ocount = mif->m6_pkt_out; req->ibytes = mif->m6_bytes_in; req->obytes = mif->m6_bytes_out; } MIF6_UNLOCK(); return (ret); } static int set_pim6(int *i) { if ((*i != 1) && (*i != 0)) return (EINVAL); /* XXX-MJ */ V_pim6 = *i; return (0); } /* * Enable multicast routing */ static int ip6_mrouter_init(struct socket *so, int v, int cmd) { struct mf6ctable *mfct; MRT6_DLOG(DEBUG_ANY, "%s: socket %p", __func__, so); if (v != 1) return (ENOPROTOOPT); mfct = somfctable(so); MROUTER6_LOCK(); if (mfct->router != NULL) { MROUTER6_UNLOCK(); return (EADDRINUSE); } MFC6_LOCK(); V_ip6_mrouting_enabled = true; mfct->router = so; mfct->router_ver = cmd; bzero(&mfct->mfchashtbl, sizeof(mfct->mfchashtbl)); bzero(&mfct->nexpire, sizeof(mfct->nexpire)); V_pim6 = 0;/* used for stubbing out/in pim stuff */ callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls_all, curvnet); MFC6_UNLOCK(); MROUTER6_UNLOCK(); MRT6_DLOG(DEBUG_ANY, "finished"); return (0); } /* * Disable IPv6 multicast forwarding. */ static void X_ip6_mrouter_done(struct socket *so) { struct mf6ctable *mfct; mifi_t mifi; u_long i; struct mf6c *rt; struct rtdetq *rte; mfct = somfctable(so); MROUTER6_LOCK(); if (mfct->router != so) { MROUTER6_UNLOCK(); return; } /* * For each phyint in use, disable promiscuous reception of all IPv6 * multicasts. */ for (mifi = 0; mifi < mfct->nummifs; mifi++) { struct mif6 *mif = &mfct->miftable[mifi]; if (mif->m6_ifp && !(mif->m6_flags & MIFF_REGISTER)) { if_allmulti(mif->m6_ifp, 0); } } MFC6_LOCK(); bzero(mfct->miftable, sizeof(mfct->miftable)); mfct->nummifs = 0; V_pim6 = 0; /* used to stub out/in pim specific code */ /* * Free all multicast forwarding cache entries. */ for (i = 0; i < MF6CTBLSIZ; i++) { rt = mfct->mfchashtbl[i]; while (rt) { struct mf6c *frt; for (rte = rt->mf6c_stall; rte != NULL; ) { struct rtdetq *n = rte->next; m_freem(rte->m); free(rte, M_MRTABLE6); rte = n; } frt = rt; rt = rt->mf6c_next; free(frt, M_MRTABLE6); } } mfct->router = NULL; mfct->router_ver = 0; V_ip6_mrouting_enabled = false; bzero(mfct->mfchashtbl, sizeof(mfct->mfchashtbl)); MFC6_UNLOCK(); /* * Reset register interface */ if (mfct->register_mif != (mifi_t)-1 && mfct->register_if != NULL) { if_detach(mfct->register_if); if_free(mfct->register_if); mfct->register_mif = (mifi_t)-1; mfct->register_if = NULL; } MROUTER6_UNLOCK(); MRT6_DLOG(DEBUG_ANY, "finished"); } static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; /* * Add a mif to the mif table */ static int add_m6if(struct mf6ctable *mfct, int fibnum, struct mif6ctl *mifcp) { struct epoch_tracker et; struct mif6 *mifp; struct ifnet *ifp; int error; MIF6_LOCK(); if (mifcp->mif6c_mifi >= MAXMIFS) { MIF6_UNLOCK(); return (EINVAL); } mifp = &mfct->miftable[mifcp->mif6c_mifi]; if (mifp->m6_ifp != NULL) { MIF6_UNLOCK(); return (EADDRINUSE); /* XXX: is it appropriate? */ } NET_EPOCH_ENTER(et); if ((ifp = ifnet_byindex(mifcp->mif6c_pifi)) == NULL) { NET_EPOCH_EXIT(et); MIF6_UNLOCK(); return (ENXIO); } NET_EPOCH_EXIT(et); /* XXXGL: unsafe ifp */ if (mifcp->mif6c_flags & MIFF_REGISTER) { if (mfct->register_mif == (mifi_t)-1) { ifp = if_alloc(IFT_OTHER); if_initname(ifp, "register_mif", 0); ifp->if_flags |= IFF_LOOPBACK; if_attach(ifp); mfct->register_if = ifp; mfct->register_mif = mifcp->mif6c_mifi; /* * it is impossible to guess the ifindex of the * register interface. So mif6c_pifi is automatically * calculated. */ mifcp->mif6c_pifi = ifp->if_index; } else { ifp = mfct->register_if; } } else { /* Make sure the interface supports multicast */ if ((ifp->if_flags & IFF_MULTICAST) == 0) { MIF6_UNLOCK(); return (EOPNOTSUPP); } if (ifp->if_fib != fibnum) { MIF6_UNLOCK(); return (EADDRNOTAVAIL); } error = if_allmulti(ifp, 1); if (error) { MIF6_UNLOCK(); return (error); } } mifp->m6_flags = mifcp->mif6c_flags; mifp->m6_ifp = ifp; /* initialize per mif pkt counters */ mifp->m6_pkt_in = 0; mifp->m6_pkt_out = 0; mifp->m6_bytes_in = 0; mifp->m6_bytes_out = 0; /* Adjust nummifs up if the mifi is higher than nummifs */ if (mfct->nummifs <= mifcp->mif6c_mifi) mfct->nummifs = mifcp->mif6c_mifi + 1; MIF6_UNLOCK(); MRT6_DLOG(DEBUG_ANY, "mif #%d, phyint %s", mifcp->mif6c_mifi, if_name(ifp)); return (0); } static void expire_mf6c(struct mf6c *mfc) { struct rtdetq *rte; while ((rte = mfc->mf6c_stall) != NULL) { mfc->mf6c_stall = rte->next; m_freem(rte->m); free(rte, M_MRTABLE6); } free(mfc, M_MRTABLE6); } /* * Delete a mif from the mif table */ static int del_m6if_locked(struct mf6ctable *mfct, mifi_t mifi) { struct mif6 *mifp; mifi_t tmp; struct ifnet *ifp; MIF6_LOCK_ASSERT(); if (mifi >= mfct->nummifs) return (EINVAL); mifp = &mfct->miftable[mifi]; if (mifp->m6_ifp == NULL) return (EINVAL); if (!(mifp->m6_flags & MIFF_REGISTER)) { ifp = mifp->m6_ifp; if_allmulti(ifp, 0); MFC6_LOCK(); for (int i = 0; i < MF6CTBLSIZ; i++) { struct mf6c *mfc, **nmfc; nmfc = &mfct->mfchashtbl[i]; while ((mfc = *nmfc) != NULL) { if (mfc->mf6c_parent == mifi) { *nmfc = mfc->mf6c_next; if (mfc->mf6c_expire) mfct->nexpire[i]--; expire_mf6c(mfc); } else { /* Remove this mif from the ifset */ if (IF_ISSET(mifi, &mfc->mf6c_ifset)) IF_CLR(mifi, &mfc->mf6c_ifset); nmfc = &mfc->mf6c_next; } } } MFC6_UNLOCK(); } else { if (mfct->register_mif != (mifi_t)-1 && mfct->register_if != NULL) { if_detach(mfct->register_if); if_free(mfct->register_if); mfct->register_mif = (mifi_t)-1; mfct->register_if = NULL; } } bzero(mifp, sizeof(*mifp)); /* Adjust nummifs down */ for (tmp = mfct->nummifs; tmp > 0; tmp--) if (mfct->miftable[tmp - 1].m6_ifp != NULL) break; mfct->nummifs = tmp; MRT6_DLOG(DEBUG_ANY, "mif %d, nummifs %d", mifi, mfct->nummifs); return (0); } static int del_m6if(struct mf6ctable *mfct, mifi_t mifi) { int cc; MIF6_LOCK(); cc = del_m6if_locked(mfct, mifi); MIF6_UNLOCK(); return (cc); } /* * Add an mfc entry */ static int add_m6fc(struct mf6ctable *mfct, struct mf6cctl *mfccp) { struct mf6c *rt; u_long hash; struct rtdetq *rte; u_short nstl; char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; MFC6_LOCK(); rt = mf6c_find(mfct, &mfccp->mf6cc_origin.sin6_addr, &mfccp->mf6cc_mcastgrp.sin6_addr); /* If an entry already exists, just update the fields */ if (rt) { MRT6_DLOG(DEBUG_MFC, "no upcall o %s g %s p %x", ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), mfccp->mf6cc_parent); rt->mf6c_parent = mfccp->mf6cc_parent; rt->mf6c_ifset = mfccp->mf6cc_ifset; MFC6_UNLOCK(); return (0); } /* * Find the entry for which the upcall was made and update */ hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, mfccp->mf6cc_mcastgrp.sin6_addr); for (rt = mfct->mfchashtbl[hash], nstl = 0; rt; rt = rt->mf6c_next) { if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, &mfccp->mf6cc_origin.sin6_addr) && IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, &mfccp->mf6cc_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) { if (nstl++) log(LOG_ERR, "add_m6fc: %s o %s g %s p %x dbx %p\n", "multiple kernel entries", ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), mfccp->mf6cc_parent, rt->mf6c_stall); MRT6_DLOG(DEBUG_MFC, "o %s g %s p %x dbg %p", ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), mfccp->mf6cc_parent, rt->mf6c_stall); rt->mf6c_origin = mfccp->mf6cc_origin; rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; rt->mf6c_parent = mfccp->mf6cc_parent; rt->mf6c_ifset = mfccp->mf6cc_ifset; /* initialize pkt counters per src-grp */ rt->mf6c_pkt_cnt = 0; rt->mf6c_byte_cnt = 0; rt->mf6c_wrong_if = 0; rt->mf6c_expire = 0; /* Don't clean this guy up */ mfct->nexpire[hash]--; /* free packets Qed at the end of this entry */ for (rte = rt->mf6c_stall; rte != NULL; ) { struct rtdetq *n = rte->next; ip6_mdq(mfct, rte->m, rte->ifp, rt); m_freem(rte->m); #ifdef UPCALL_TIMING collate(&(rte->t)); #endif /* UPCALL_TIMING */ free(rte, M_MRTABLE6); rte = n; } rt->mf6c_stall = NULL; } } /* * It is possible that an entry is being inserted without an upcall */ if (nstl == 0) { MRT6_DLOG(DEBUG_MFC, "no upcall h %lu o %s g %s p %x", hash, ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), mfccp->mf6cc_parent); for (rt = mfct->mfchashtbl[hash]; rt; rt = rt->mf6c_next) { if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, &mfccp->mf6cc_origin.sin6_addr)&& IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, &mfccp->mf6cc_mcastgrp.sin6_addr)) { rt->mf6c_origin = mfccp->mf6cc_origin; rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; rt->mf6c_parent = mfccp->mf6cc_parent; rt->mf6c_ifset = mfccp->mf6cc_ifset; /* initialize pkt counters per src-grp */ rt->mf6c_pkt_cnt = 0; rt->mf6c_byte_cnt = 0; rt->mf6c_wrong_if = 0; if (rt->mf6c_expire) mfct->nexpire[hash]--; rt->mf6c_expire = 0; } } if (rt == NULL) { /* no upcall, so make a new entry */ rt = malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); if (rt == NULL) { MFC6_UNLOCK(); return (ENOBUFS); } /* insert new entry at head of hash chain */ rt->mf6c_origin = mfccp->mf6cc_origin; rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; rt->mf6c_parent = mfccp->mf6cc_parent; rt->mf6c_ifset = mfccp->mf6cc_ifset; /* initialize pkt counters per src-grp */ rt->mf6c_pkt_cnt = 0; rt->mf6c_byte_cnt = 0; rt->mf6c_wrong_if = 0; rt->mf6c_expire = 0; rt->mf6c_stall = NULL; /* link into table */ rt->mf6c_next = mfct->mfchashtbl[hash]; mfct->mfchashtbl[hash] = rt; } } MFC6_UNLOCK(); return (0); } #ifdef UPCALL_TIMING /* * collect delay statistics on the upcalls */ static void collate(struct timeval *t) { u_long d; struct timeval tp; u_long delta; GET_TIME(tp); if (TV_LT(*t, tp)) { TV_DELTA(tp, *t, delta); d = delta >> 10; if (d > UPCALL_MAX) d = UPCALL_MAX; ++upcall_data[d]; } } #endif /* UPCALL_TIMING */ /* * Delete an mfc entry */ static int del_m6fc(struct mf6ctable *mfct, struct mf6cctl *mfccp) { #ifdef MRT6DEBUG char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; #endif struct sockaddr_in6 origin; struct sockaddr_in6 mcastgrp; struct mf6c *rt; struct mf6c **nptr; u_long hash; origin = mfccp->mf6cc_origin; mcastgrp = mfccp->mf6cc_mcastgrp; hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); MRT6_DLOG(DEBUG_MFC, "orig %s mcastgrp %s", ip6_sprintf(ip6bufo, &origin.sin6_addr), ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); MFC6_LOCK(); nptr = &mfct->mfchashtbl[hash]; while ((rt = *nptr) != NULL) { if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, &rt->mf6c_origin.sin6_addr) && IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, &rt->mf6c_mcastgrp.sin6_addr) && rt->mf6c_stall == NULL) break; nptr = &rt->mf6c_next; } if (rt == NULL) { MFC6_UNLOCK(); return (EADDRNOTAVAIL); } *nptr = rt->mf6c_next; free(rt, M_MRTABLE6); MFC6_UNLOCK(); return (0); } static int socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) { if (s) { if (sbappendaddr(&s->so_rcv, (struct sockaddr *)src, mm, (struct mbuf *)0) != 0) { sorwakeup(s); return (0); } else soroverflow(s); } m_freem(mm); return (-1); } /* * IPv6 multicast forwarding function. This function assumes that the packet * pointed to by "ip6" has arrived on (or is about to be sent to) the interface * pointed to by "ifp", and the packet is to be relayed to other networks * that have members of the packet's destination IPv6 multicast group. * * The packet is returned unscathed to the caller, unless it is * erroneous, in which case a non-zero return value tells the caller to * discard it. * * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff * this function is called in the originating context (i.e., not when * forwarding a packet from other node). ip6_output(), which is currently the * only function that calls this function is called in the originating context, * explicitly ensures this condition. It is caller's responsibility to ensure * that if this function is called from somewhere else in the originating * context in the future. */ static int X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) { struct mf6ctable *mfct; struct rtdetq *rte; struct mbuf *mb0; struct mf6c *rt; struct mif6 *mifp; struct mbuf *mm; u_long hash; mifi_t mifi; char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; #ifdef UPCALL_TIMING struct timeval tp; GET_TIME(tp); #endif /* UPCALL_TIMING */ M_ASSERTMAPPED(m); MRT6_DLOG(DEBUG_FORWARD, "src %s, dst %s, ifindex %d", ip6_sprintf(ip6bufs, &ip6->ip6_src), ip6_sprintf(ip6bufd, &ip6->ip6_dst), ifp->if_index); /* * Don't forward a packet with Hop limit of zero or one, * or a packet destined to a local-only group. */ if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) return (0); ip6->ip6_hlim--; /* * Source address check: do not forward packets with unspecified * source. It was discussed in July 2000, on ipngwg mailing list. * This is rather more serious than unicast cases, because some * MLD packets can be sent with the unspecified source address * (although such packets must normally set 1 to the hop limit field). */ if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { IP6STAT_INC(ip6s_cantforward); if (V_ip6_log_cannot_forward && ip6_log_ratelimit()) { log(LOG_DEBUG, "cannot forward " "from %s to %s nxt %d received on %s\n", ip6_sprintf(ip6bufs, &ip6->ip6_src), ip6_sprintf(ip6bufd, &ip6->ip6_dst), ip6->ip6_nxt, if_name(m->m_pkthdr.rcvif)); } return (0); } mfct = &V_mfctables[M_GETFIB(m)]; MFC6_LOCK(); if (__predict_false(mfct->router == NULL)) { MFC6_UNLOCK(); return (EADDRNOTAVAIL); } /* * Determine forwarding mifs from the forwarding cache table */ rt = mf6c_find(mfct, &ip6->ip6_src, &ip6->ip6_dst); MRT6STAT_INC(mrt6s_mfc_lookups); /* Entry exists, so forward if necessary */ if (rt) { MFC6_UNLOCK(); return (ip6_mdq(mfct, m, ifp, rt)); } /* * If we don't have a route for packet's origin, * Make a copy of the packet & send message to routing daemon. */ MRT6STAT_INC(mrt6s_no_route); MRT6_DLOG(DEBUG_FORWARD | DEBUG_MFC, "no rte s %s g %s", ip6_sprintf(ip6bufs, &ip6->ip6_src), ip6_sprintf(ip6bufd, &ip6->ip6_dst)); /* * Allocate mbufs early so that we don't do extra work if we * are just going to fail anyway. */ rte = malloc(sizeof(*rte), M_MRTABLE6, M_NOWAIT); if (rte == NULL) { MFC6_UNLOCK(); return (ENOBUFS); } mb0 = m_copym(m, 0, M_COPYALL, M_NOWAIT); /* * Pullup packet header if needed before storing it, * as other references may modify it in the meantime. */ if (mb0 && (!M_WRITABLE(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); if (mb0 == NULL) { free(rte, M_MRTABLE6); MFC6_UNLOCK(); return (ENOBUFS); } /* is there an upcall waiting for this packet? */ hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); for (rt = mfct->mfchashtbl[hash]; rt; rt = rt->mf6c_next) { if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &rt->mf6c_origin.sin6_addr) && IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt->mf6c_mcastgrp.sin6_addr) && (rt->mf6c_stall != NULL)) break; } if (rt == NULL) { struct mrt6msg *im; #ifdef MRT6_OINIT struct omrt6msg *oim; #endif /* no upcall, so make a new entry */ rt = malloc(sizeof(*rt), M_MRTABLE6, M_NOWAIT); if (rt == NULL) { free(rte, M_MRTABLE6); m_freem(mb0); MFC6_UNLOCK(); return (ENOBUFS); } /* * Make a copy of the header to send to the user * level process */ mm = m_copym(mb0, 0, sizeof(struct ip6_hdr), M_NOWAIT); if (mm == NULL) { free(rte, M_MRTABLE6); m_freem(mb0); free(rt, M_MRTABLE6); MFC6_UNLOCK(); return (ENOBUFS); } /* * Send message to routing daemon */ sin6.sin6_addr = ip6->ip6_src; im = NULL; #ifdef MRT6_OINIT oim = NULL; #endif switch (mfct->router_ver) { #ifdef MRT6_OINIT case MRT6_OINIT: oim = mtod(mm, struct omrt6msg *); oim->im6_msgtype = MRT6MSG_NOCACHE; oim->im6_mbz = 0; break; #endif case MRT6_INIT: im = mtod(mm, struct mrt6msg *); im->im6_msgtype = MRT6MSG_NOCACHE; im->im6_mbz = 0; break; default: free(rte, M_MRTABLE6); m_freem(mb0); free(rt, M_MRTABLE6); MFC6_UNLOCK(); return (EINVAL); } MRT6_DLOG(DEBUG_FORWARD, "getting the iif info in the kernel"); for (mifp = mfct->miftable, mifi = 0; mifi < mfct->nummifs && mifp->m6_ifp != ifp; mifp++, mifi++) ; switch (mfct->router_ver) { #ifdef MRT6_OINIT case MRT6_OINIT: oim->im6_mif = mifi; break; #endif case MRT6_INIT: im->im6_mif = mifi; break; } if (socket_send(mfct->router, mm, &sin6) < 0) { log(LOG_WARNING, "ip6_mforward: ip6_mrouter " "socket queue full\n"); MRT6STAT_INC(mrt6s_upq_sockfull); free(rte, M_MRTABLE6); m_freem(mb0); free(rt, M_MRTABLE6); MFC6_UNLOCK(); return (ENOBUFS); } MRT6STAT_INC(mrt6s_upcalls); /* insert new entry at head of hash chain */ bzero(rt, sizeof(*rt)); rt->mf6c_origin.sin6_family = AF_INET6; rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); rt->mf6c_origin.sin6_addr = ip6->ip6_src; rt->mf6c_mcastgrp.sin6_family = AF_INET6; rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; rt->mf6c_expire = UPCALL_EXPIRE; mfct->nexpire[hash]++; rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; /* link into table */ rt->mf6c_next = mfct->mfchashtbl[hash]; mfct->mfchashtbl[hash] = rt; /* Add this entry to the end of the queue */ rt->mf6c_stall = rte; } else { /* determine if q has overflowed */ struct rtdetq **p; int npkts = 0; for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) if (++npkts > MAX_UPQ6) { MRT6STAT_INC(mrt6s_upq_ovflw); free(rte, M_MRTABLE6); m_freem(mb0); MFC6_UNLOCK(); return (0); } /* Add this entry to the end of the queue */ *p = rte; } rte->next = NULL; rte->m = mb0; rte->ifp = ifp; #ifdef UPCALL_TIMING rte->t = tp; #endif /* UPCALL_TIMING */ MFC6_UNLOCK(); return (0); } /* * Clean up cache entries if upcalls are not serviced * Call from the Slow Timeout mechanism, every half second. */ static void expire_upcalls(struct mf6ctable *mfct) { #ifdef MRT6DEBUG char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; #endif struct rtdetq *rte; struct mf6c *mfc, **nptr; u_long i; MFC6_LOCK_ASSERT(); for (i = 0; i < MF6CTBLSIZ; i++) { if (mfct->nexpire[i] == 0) continue; nptr = &mfct->mfchashtbl[i]; while ((mfc = *nptr) != NULL) { rte = mfc->mf6c_stall; /* * Skip real cache entries * Make sure it wasn't marked to not expire (shouldn't happen) * If it expires now */ if (rte != NULL && mfc->mf6c_expire != 0 && --mfc->mf6c_expire == 0) { MRT6_DLOG(DEBUG_EXPIRE, "expiring (%s %s)", ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); /* * drop all the packets * free the mbuf with the pkt, if, timing info */ do { struct rtdetq *n = rte->next; m_freem(rte->m); free(rte, M_MRTABLE6); rte = n; } while (rte != NULL); MRT6STAT_INC(mrt6s_cache_cleanups); mfct->nexpire[i]--; *nptr = mfc->mf6c_next; free(mfc, M_MRTABLE6); } else { nptr = &mfc->mf6c_next; } } } } /* * Clean up the cache entry if upcall is not serviced */ static void expire_upcalls_all(void *arg) { CURVNET_SET((struct vnet *)arg); for (int i = 0; i < V_nmfctables; i++) expire_upcalls(&V_mfctables[i]); callout_reset(&V_expire_upcalls_ch, EXPIRE_TIMEOUT, expire_upcalls_all, curvnet); CURVNET_RESTORE(); } /* * Packet forwarding routine once entry in the cache is made */ static int ip6_mdq(struct mf6ctable *mfct, struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) { struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); mifi_t mifi, iif; struct mif6 *mifp; int plen = m->m_pkthdr.len; struct in6_addr src0, dst0; /* copies for local work */ u_int32_t iszone, idzone, oszone, odzone; int error = 0; M_ASSERTMAPPED(m); /* * Don't forward if it didn't arrive from the parent mif * for its origin. */ mifi = rt->mf6c_parent; if (mifi >= mfct->nummifs || mfct->miftable[mifi].m6_ifp != ifp) { MRT6STAT_INC(mrt6s_wrong_if); rt->mf6c_wrong_if++; if (mifi >= mfct->nummifs) return (0); mifp = &mfct->miftable[mifi]; MRT6_DLOG(DEBUG_FORWARD, "wrong if: ifid %d mifi %d mififid %x", ifp->if_index, mifi, mifp->m6_ifp->if_index); /* * If we are doing PIM processing, and we are forwarding * packets on this interface, send a message to the * routing daemon. */ /* have to make sure this is a valid mif */ if (mifp->m6_ifp && V_pim6 && (m->m_flags & M_LOOP) == 0) { /* * Check the M_LOOP flag to avoid an * unnecessary PIM assert. * XXX: M_LOOP is an ad-hoc hack... */ static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; struct mbuf *mm; struct mrt6msg *im; #ifdef MRT6_OINIT struct omrt6msg *oim; #endif mm = m_copym(m, 0, sizeof(struct ip6_hdr), M_NOWAIT); if (mm && (!M_WRITABLE(mm) || mm->m_len < sizeof(struct ip6_hdr))) mm = m_pullup(mm, sizeof(struct ip6_hdr)); if (mm == NULL) return (ENOBUFS); #ifdef MRT6_OINIT oim = NULL; #endif im = NULL; switch (mfct->router_ver) { #ifdef MRT6_OINIT case MRT6_OINIT: oim = mtod(mm, struct omrt6msg *); oim->im6_msgtype = MRT6MSG_WRONGMIF; oim->im6_mbz = 0; break; #endif case MRT6_INIT: im = mtod(mm, struct mrt6msg *); im->im6_msgtype = MRT6MSG_WRONGMIF; im->im6_mbz = 0; break; default: m_freem(mm); return (EINVAL); } for (mifp = mfct->miftable, iif = 0; iif < mfct->nummifs && mifp->m6_ifp != ifp; mifp++, iif++) ; switch (mfct->router_ver) { #ifdef MRT6_OINIT case MRT6_OINIT: oim->im6_mif = iif; sin6.sin6_addr = oim->im6_src; break; #endif case MRT6_INIT: im->im6_mif = iif; sin6.sin6_addr = im->im6_src; break; } MRT6STAT_INC(mrt6s_upcalls); if (socket_send(mfct->router, mm, &sin6) < 0) { MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); MRT6STAT_INC(mrt6s_upq_sockfull); return (ENOBUFS); } } return (0); } mifp = &mfct->miftable[mifi]; /* If I sourced this packet, it counts as output, else it was input. */ if (m->m_pkthdr.rcvif == NULL) { /* XXX: is rcvif really NULL when output?? */ mifp->m6_pkt_out++; mifp->m6_bytes_out += plen; } else { mifp->m6_pkt_in++; mifp->m6_bytes_in += plen; } rt->mf6c_pkt_cnt++; rt->mf6c_byte_cnt += plen; /* * For each mif, forward a copy of the packet if there are group * members downstream on the interface. */ src0 = ip6->ip6_src; dst0 = ip6->ip6_dst; if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { IP6STAT_INC(ip6s_badscope); return (error); } for (mifp = mfct->miftable, mifi = 0; mifi < mfct->nummifs; mifp++, mifi++) { if (IF_ISSET(mifi, &rt->mf6c_ifset)) { /* * check if the outgoing packet is going to break * a scope boundary. * XXX For packets through PIM register tunnel * interface, we believe a routing daemon. */ if (!(mfct->miftable[rt->mf6c_parent].m6_flags & MIFF_REGISTER) && !(mifp->m6_flags & MIFF_REGISTER)) { if (in6_setscope(&src0, mifp->m6_ifp, &oszone) || in6_setscope(&dst0, mifp->m6_ifp, &odzone) || iszone != oszone || idzone != odzone) { IP6STAT_INC(ip6s_badscope); continue; } } mifp->m6_pkt_out++; mifp->m6_bytes_out += plen; if (mifp->m6_flags & MIFF_REGISTER) register_send(mfct, ip6, mifi, m); else phyint_send(ip6, mifp, m); } } return (0); } static void phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) { #ifdef MRT6DEBUG char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; #endif struct mbuf *mb_copy; struct ifnet *ifp = mifp->m6_ifp; int error __unused = 0; u_long linkmtu; M_ASSERTMAPPED(m); /* * Make a new reference to the packet; make sure that * the IPv6 header is actually copied, not just referenced, * so that ip6_output() only scribbles on the copy. */ mb_copy = m_copym(m, 0, M_COPYALL, M_NOWAIT); if (mb_copy && (!M_WRITABLE(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); if (mb_copy == NULL) { return; } /* set MCAST flag to the outgoing packet */ mb_copy->m_flags |= M_MCAST; /* * If we sourced the packet, call ip6_output since we may devide * the packet into fragments when the packet is too big for the * outgoing interface. * Otherwise, we can simply send the packet to the interface * sending queue. */ if (m->m_pkthdr.rcvif == NULL) { struct ip6_moptions im6o; struct epoch_tracker et; im6o.im6o_multicast_ifp = ifp; /* XXX: ip6_output will override ip6->ip6_hlim */ im6o.im6o_multicast_hlim = ip6->ip6_hlim; im6o.im6o_multicast_loop = 1; NET_EPOCH_ENTER(et); error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, NULL, NULL); NET_EPOCH_EXIT(et); MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", (uint16_t)(mifp - mif6table), error); return; } /* * If configured to loop back multicasts by default, * loop back a copy now. */ if (in6_mcast_loop) ip6_mloopback(ifp, m); /* * Put the packet into the sending queue of the outgoing interface * if it would fit in the MTU of the interface. */ linkmtu = in6_ifmtu(ifp); if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { struct sockaddr_in6 dst6; bzero(&dst6, sizeof(dst6)); dst6.sin6_len = sizeof(struct sockaddr_in6); dst6.sin6_family = AF_INET6; dst6.sin6_addr = ip6->ip6_dst; IP_PROBE(send, NULL, NULL, ip6, ifp, NULL, ip6); /* * We just call if_output instead of nd6_output here, since * we need no ND for a multicast forwarded packet...right? */ m_clrprotoflags(m); /* Avoid confusing lower layers. */ error = (*ifp->if_output)(ifp, mb_copy, (struct sockaddr *)&dst6, NULL); MRT6_DLOG(DEBUG_XMIT, "mif %u err %d", (uint16_t)(mifp - mif6table), error); } else { /* * pMTU discovery is intentionally disabled by default, since * various router may notify pMTU in multicast, which can be * a DDoS to a router */ if (V_ip6_mcast_pmtu) icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); else { MRT6_DLOG(DEBUG_XMIT, " packet too big on %s o %s " "g %s size %d (discarded)", if_name(ifp), ip6_sprintf(ip6bufs, &ip6->ip6_src), ip6_sprintf(ip6bufd, &ip6->ip6_dst), mb_copy->m_pkthdr.len); m_freem(mb_copy); /* simply discard the packet */ } } } static int register_send(struct mf6ctable *mfct, struct ip6_hdr *ip6, mifi_t mifi, struct mbuf *m) { #ifdef MRT6DEBUG char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; #endif struct mbuf *mm; int i, len = m->m_pkthdr.len; static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; struct mrt6msg *im6; MRT6_DLOG(DEBUG_ANY, "src %s dst %s", ip6_sprintf(ip6bufs, &ip6->ip6_src), ip6_sprintf(ip6bufd, &ip6->ip6_dst)); PIM6STAT_INC(pim6s_snd_registers); /* Make a copy of the packet to send to the user level process. */ mm = m_gethdr(M_NOWAIT, MT_DATA); if (mm == NULL) return (ENOBUFS); mm->m_data += max_linkhdr; mm->m_len = sizeof(struct ip6_hdr); if ((mm->m_next = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL) { m_freem(mm); return (ENOBUFS); } i = MHLEN - M_LEADINGSPACE(mm); if (i > len) i = len; mm = m_pullup(mm, i); if (mm == NULL) return (ENOBUFS); /* TODO: check it! */ mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); /* * Send message to routing daemon */ sin6.sin6_addr = ip6->ip6_src; im6 = mtod(mm, struct mrt6msg *); im6->im6_msgtype = MRT6MSG_WHOLEPKT; im6->im6_mbz = 0; im6->im6_mif = mifi; /* iif info is not given for reg. encap.n */ MRT6STAT_INC(mrt6s_upcalls); if (socket_send(mfct->router, mm, &sin6) < 0) { MRT6_DLOG(DEBUG_ANY, "ip6_mrouter socket queue full"); MRT6STAT_INC(mrt6s_upq_sockfull); return (ENOBUFS); } return (0); } /* * pim6_encapcheck() is called by the encap6_input() path at runtime to * determine if a packet is for PIM; allowing PIM to be dynamically loaded * into the kernel. */ static int pim6_encapcheck(const struct mbuf *m __unused, int off __unused, int proto __unused, void *arg __unused) { KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); return (8); /* claim the datagram. */ } /* * PIM sparse mode hook * Receives the pim control messages, and passes them up to the listening * socket, using rip6_input. * The only message processed is the REGISTER pim message; the pim header * is stripped off, and the inner packet is passed to register_mforward. */ static int pim6_input(struct mbuf *m, int off, int proto, void *arg __unused) { struct mf6ctable *mfct; struct pim *pim; struct ip6_hdr *ip6; int pimlen; int minlen; mfct = &V_mfctables[M_GETFIB(m)]; PIM6STAT_INC(pim6s_rcv_total); /* * Validate lengths */ pimlen = m->m_pkthdr.len - off; if (pimlen < PIM_MINLEN) { PIM6STAT_INC(pim6s_rcv_tooshort); MRT6_DLOG(DEBUG_PIM, "PIM packet too short"); m_freem(m); return (IPPROTO_DONE); } /* * if the packet is at least as big as a REGISTER, go ahead * and grab the PIM REGISTER header size, to avoid another * possible m_pullup() later. * * PIM_MINLEN == pimhdr + u_int32 == 8 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 */ minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; /* * Make sure that the IP6 and PIM headers in contiguous memory, and * possibly the PIM REGISTER header */ if (m->m_len < off + minlen) { m = m_pullup(m, off + minlen); if (m == NULL) { IP6STAT_INC(ip6s_exthdrtoolong); return (IPPROTO_DONE); } } ip6 = mtod(m, struct ip6_hdr *); pim = (struct pim *)((char *)ip6 + off); #define PIM6_CHECKSUM #ifdef PIM6_CHECKSUM { int cksumlen; /* * Validate checksum. * If PIM REGISTER, exclude the data packet */ if (pim->pim_type == PIM_REGISTER) cksumlen = PIM_MINLEN; else cksumlen = pimlen; if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { PIM6STAT_INC(pim6s_rcv_badsum); MRT6_DLOG(DEBUG_PIM, "invalid checksum"); m_freem(m); return (IPPROTO_DONE); } } #endif /* PIM_CHECKSUM */ /* PIM version check */ if (pim->pim_ver != PIM_VERSION) { PIM6STAT_INC(pim6s_rcv_badversion); MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "incorrect version %d, expecting %d", pim->pim_ver, PIM_VERSION); m_freem(m); return (IPPROTO_DONE); } if (pim->pim_type == PIM_REGISTER) { /* * since this is a REGISTER, we'll make a copy of the register * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the * routing daemon. */ static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; struct mbuf *mcp; struct ip6_hdr *eip6; u_int32_t *reghdr; #ifdef MRT6DEBUG char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; #endif PIM6STAT_INC(pim6s_rcv_registers); if (mfct->register_mif >= mfct->nummifs || mfct->register_mif == (mifi_t)-1) { MRT6_DLOG(DEBUG_PIM, "register mif not set: %d", mfct->register_mif); m_freem(m); return (IPPROTO_DONE); } reghdr = (u_int32_t *)(pim + 1); if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) goto pim6_input_to_daemon; /* * Validate length */ if (pimlen < PIM6_REG_MINLEN) { PIM6STAT_INC(pim6s_rcv_tooshort); PIM6STAT_INC(pim6s_rcv_badregisters); MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "register packet " "size too small %d from %s", pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); m_freem(m); return (IPPROTO_DONE); } eip6 = (struct ip6_hdr *) (reghdr + 1); MRT6_DLOG(DEBUG_PIM, "eip6: %s -> %s, eip6 plen %d", ip6_sprintf(ip6bufs, &eip6->ip6_src), ip6_sprintf(ip6bufd, &eip6->ip6_dst), ntohs(eip6->ip6_plen)); /* verify the version number of the inner packet */ if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { PIM6STAT_INC(pim6s_rcv_badregisters); MRT6_DLOG(DEBUG_ANY, "invalid IP version (%d) " "of the inner packet", (eip6->ip6_vfc & IPV6_VERSION)); m_freem(m); return (IPPROTO_DONE); } /* verify the inner packet is destined to a mcast group */ if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { PIM6STAT_INC(pim6s_rcv_badregisters); MRT6_DLOG(DEBUG_PIM, "inner packet of register " "is not multicast %s", ip6_sprintf(ip6bufd, &eip6->ip6_dst)); m_freem(m); return (IPPROTO_DONE); } /* * make a copy of the whole header to pass to the daemon later. */ mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT); if (mcp == NULL) { MRT6_DLOG(DEBUG_ANY | DEBUG_ERR, "pim register: " "could not copy register head"); m_freem(m); return (IPPROTO_DONE); } /* * forward the inner ip6 packet; point m_data at the inner ip6. */ m_adj(m, off + PIM_MINLEN); MRT6_DLOG(DEBUG_PIM, "forwarding decapsulated register: " "src %s, dst %s, mif %d", ip6_sprintf(ip6bufs, &eip6->ip6_src), ip6_sprintf(ip6bufd, &eip6->ip6_dst), mfct->register_mif); if_simloop(mfct->miftable[mfct->register_mif].m6_ifp, m, dst.sin6_family, 0); /* prepare the register head to send to the mrouting daemon */ m = mcp; } /* * Pass the PIM message up to the daemon; if it is a register message * pass the 'head' only up to the daemon. This includes the * encapsulator ip6 header, pim header, register header and the * encapsulated ip6 header. */ pim6_input_to_daemon: return (rip6_input(&m, &off, proto)); } static void ip6_mrouter_ifdetach(void *arg __unused, struct ifnet *ifp) { struct mf6ctable *mfct; if (!V_ip6_mrouting_enabled) return; for (int i = 0; i < V_nmfctables; i++) { mfct = &V_mfctables[i]; MIF6_LOCK(); restart: for (mifi_t mifi = 0; mifi < mfct->nummifs; mifi++) { int error __diagused; if (mfct->miftable[mifi].m6_ifp != ifp) continue; error = del_m6if_locked(mfct, mifi); KASSERT(error == 0, ("del_m6if_locked(%s) %d", ifp->if_xname, error)); goto restart; } MIF6_UNLOCK(); } } static void ip6_mroute_rtnumfibs_change(void *arg __unused, uint32_t ntables) { struct mf6ctable *mfctables, *omfctables; KASSERT(ntables >= V_nmfctables, ("%s: ntables %u nmfctables %u", __func__, ntables, V_nmfctables)); mfctables = mallocarray(ntables, sizeof(*mfctables), M_MRTABLE6, M_WAITOK | M_ZERO); omfctables = V_mfctables; MROUTER6_LOCK(); MFC6_LOCK(); for (int i = 0; i < V_nmfctables; i++) memcpy(&mfctables[i], &omfctables[i], sizeof(*mfctables)); atomic_store_rel_ptr((uintptr_t *)&V_mfctables, (uintptr_t)mfctables); MFC6_UNLOCK(); MROUTER6_UNLOCK(); NET_EPOCH_WAIT(); V_nmfctables = ntables; free(omfctables, M_MRTABLE6); } static void vnet_mroute_init(const void *unused __unused) { ip6_mroute_rtnumfibs_change(NULL, V_rt_numfibs); callout_init_mtx(&V_expire_upcalls_ch, MFC6_LOCKPTR(), 0); } VNET_SYSINIT(vnet_mroute6_init, SI_SUB_PROTO_MC, SI_ORDER_ANY, vnet_mroute_init, NULL); static void vnet_mroute_uninit(const void *unused __unused) { callout_drain(&V_expire_upcalls_ch); free(V_mfctables, M_MRTABLE6); V_mfctables = NULL; } VNET_SYSUNINIT(vnet_mroute6_uninit, SI_SUB_PROTO_MC, SI_ORDER_ANY, vnet_mroute_uninit, NULL); static int ip6_mroute_modevent(module_t mod, int type, void *unused) { switch (type) { case MOD_LOAD: MROUTER6_LOCK_INIT(); MFC6_LOCK_INIT(); MIF6_LOCK_INIT(); ifdetach_tag = EVENTHANDLER_REGISTER( ifnet_departure_event, ip6_mrouter_ifdetach, NULL, EVENTHANDLER_PRI_ANY); rtnumfibs_change_tag = EVENTHANDLER_REGISTER( rtnumfibs_change, ip6_mroute_rtnumfibs_change, NULL, EVENTHANDLER_PRI_ANY); pim6_encap_cookie = ip6_encap_attach(&ipv6_encap_cfg, NULL, M_WAITOK); if (pim6_encap_cookie == NULL) { printf("ip6_mroute: unable to attach pim6 encap\n"); MIF6_LOCK_DESTROY(); MFC6_LOCK_DESTROY(); MROUTER6_LOCK_DESTROY(); return (EINVAL); } ip6_mforward = X_ip6_mforward; ip6_mrouter_done = X_ip6_mrouter_done; ip6_mrouter_get = X_ip6_mrouter_get; ip6_mrouter_set = X_ip6_mrouter_set; mrt6_ioctl = X_mrt6_ioctl; break; case MOD_UNLOAD: if (V_ip6_mrouting_enabled) return (EBUSY); EVENTHANDLER_DEREGISTER(ifnet_departure_event, ifdetach_tag); EVENTHANDLER_DEREGISTER(rtnumfibs_change, rtnumfibs_change_tag); if (pim6_encap_cookie) { ip6_encap_detach(pim6_encap_cookie); pim6_encap_cookie = NULL; } ip6_mforward = NULL; ip6_mrouter_done = NULL; ip6_mrouter_get = NULL; ip6_mrouter_set = NULL; mrt6_ioctl = NULL; MIF6_LOCK_DESTROY(); MFC6_LOCK_DESTROY(); MROUTER6_LOCK_DESTROY(); break; default: return (EOPNOTSUPP); } return (0); } static moduledata_t ip6_mroutemod = { "ip6_mroute", ip6_mroute_modevent, 0 }; DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PROTO_MC, SI_ORDER_MIDDLE);