ip6_mroute.c revision 252566
1236592Sobrien/*- 2236592Sobrien * Copyright (C) 1998 WIDE Project. 3236592Sobrien * All rights reserved. 4236592Sobrien * 5236592Sobrien * Redistribution and use in source and binary forms, with or without 6236592Sobrien * modification, are permitted provided that the following conditions 7236592Sobrien * are met: 8236592Sobrien * 1. Redistributions of source code must retain the above copyright 9236592Sobrien * notice, this list of conditions and the following disclaimer. 10236592Sobrien * 2. Redistributions in binary form must reproduce the above copyright 11236592Sobrien * notice, this list of conditions and the following disclaimer in the 12236592Sobrien * documentation and/or other materials provided with the distribution. 13236592Sobrien * 3. Neither the name of the project nor the names of its contributors 14236592Sobrien * may be used to endorse or promote products derived from this software 15236592Sobrien * without specific prior written permission. 16236592Sobrien * 17236592Sobrien * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18236592Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19236592Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20236592Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21236592Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22236592Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23236592Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24236592Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25236592Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26236592Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27236592Sobrien * SUCH DAMAGE. 28236592Sobrien * 29236592Sobrien * $KAME: ip6_mroute.c,v 1.58 2001/12/18 02:36:31 itojun Exp $ 30236592Sobrien */ 31236592Sobrien 32236592Sobrien/*- 33236592Sobrien * Copyright (c) 1989 Stephen Deering 34236592Sobrien * Copyright (c) 1992, 1993 35236592Sobrien * The Regents of the University of California. All rights reserved. 36236592Sobrien * 37236592Sobrien * This code is derived from software contributed to Berkeley by 38236592Sobrien * Stephen Deering of Stanford University. 39236592Sobrien * 40236592Sobrien * Redistribution and use in source and binary forms, with or without 41236592Sobrien * modification, are permitted provided that the following conditions 42236592Sobrien * are met: 43236592Sobrien * 1. Redistributions of source code must retain the above copyright 44236592Sobrien * notice, this list of conditions and the following disclaimer. 45236592Sobrien * 2. Redistributions in binary form must reproduce the above copyright 46236592Sobrien * notice, this list of conditions and the following disclaimer in the 47236592Sobrien * documentation and/or other materials provided with the distribution. 48236592Sobrien * 4. Neither the name of the University nor the names of its contributors 49236592Sobrien * may be used to endorse or promote products derived from this software 50236592Sobrien * without specific prior written permission. 51236592Sobrien * 52236592Sobrien * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53236592Sobrien * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54236592Sobrien * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55236592Sobrien * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56236592Sobrien * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57236592Sobrien * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58236592Sobrien * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59236592Sobrien * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60236592Sobrien * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61236592Sobrien * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62236592Sobrien * SUCH DAMAGE. 63236592Sobrien * 64236592Sobrien * @(#)ip_mroute.c 8.2 (Berkeley) 11/15/93 65236592Sobrien * BSDI ip_mroute.c,v 2.10 1996/11/14 00:29:52 jch Exp 66236592Sobrien */ 67236592Sobrien 68236592Sobrien/* 69236592Sobrien * IP multicast forwarding procedures 70236592Sobrien * 71236592Sobrien * Written by David Waitzman, BBN Labs, August 1988. 72236592Sobrien * Modified by Steve Deering, Stanford, February 1989. 73236592Sobrien * Modified by Mark J. Steiglitz, Stanford, May, 1991 74236592Sobrien * Modified by Van Jacobson, LBL, January 1993 75236592Sobrien * Modified by Ajit Thyagarajan, PARC, August 1993 76236592Sobrien * Modified by Bill Fenner, PARC, April 1994 77236592Sobrien * 78236592Sobrien * MROUTING Revision: 3.5.1.2 + PIM-SMv2 (pimd) Support 79236592Sobrien */ 80236592Sobrien 81236592Sobrien#include <sys/cdefs.h> 82236592Sobrien__FBSDID("$FreeBSD: stable/9/sys/netinet6/ip6_mroute.c 252566 2013-07-03 13:03:09Z ae $"); 83236592Sobrien 84236592Sobrien#include "opt_inet6.h" 85236592Sobrien 86236592Sobrien#include <sys/param.h> 87236592Sobrien#include <sys/callout.h> 88236592Sobrien#include <sys/errno.h> 89236592Sobrien#include <sys/kernel.h> 90236592Sobrien#include <sys/lock.h> 91236592Sobrien#include <sys/malloc.h> 92236592Sobrien#include <sys/mbuf.h> 93236592Sobrien#include <sys/module.h> 94236592Sobrien#include <sys/domain.h> 95236592Sobrien#include <sys/protosw.h> 96236592Sobrien#include <sys/signalvar.h> 97236592Sobrien#include <sys/socket.h> 98236592Sobrien#include <sys/socketvar.h> 99236592Sobrien#include <sys/sockio.h> 100236592Sobrien#include <sys/sx.h> 101236592Sobrien#include <sys/sysctl.h> 102236592Sobrien#include <sys/syslog.h> 103236592Sobrien#include <sys/systm.h> 104236592Sobrien#include <sys/time.h> 105236592Sobrien 106236592Sobrien#include <net/if.h> 107236592Sobrien#include <net/if_types.h> 108236592Sobrien#include <net/raw_cb.h> 109236592Sobrien#include <net/vnet.h> 110236592Sobrien 111236592Sobrien#include <netinet/in.h> 112236592Sobrien#include <netinet/in_var.h> 113236592Sobrien#include <netinet/icmp6.h> 114236592Sobrien#include <netinet/ip_encap.h> 115236592Sobrien 116236592Sobrien#include <netinet/ip6.h> 117236592Sobrien#include <netinet6/ip6_var.h> 118236592Sobrien#include <netinet6/scope6_var.h> 119236592Sobrien#include <netinet6/nd6.h> 120236592Sobrien#include <netinet6/ip6_mroute.h> 121236592Sobrien#include <netinet6/ip6protosw.h> 122236592Sobrien#include <netinet6/pim6.h> 123236592Sobrien#include <netinet6/pim6_var.h> 124236592Sobrien 125236592Sobrienstatic MALLOC_DEFINE(M_MRTABLE6, "mf6c", "multicast forwarding cache entry"); 126236592Sobrien 127236592Sobrien/* XXX: this is a very common idiom; move to <sys/mbuf.h> ? */ 128236592Sobrien#define M_HASCL(m) ((m)->m_flags & M_EXT) 129236592Sobrien 130236592Sobrienstatic int ip6_mdq(struct mbuf *, struct ifnet *, struct mf6c *); 131236592Sobrienstatic void phyint_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 132236592Sobrienstatic int register_send(struct ip6_hdr *, struct mif6 *, struct mbuf *); 133236592Sobrienstatic int set_pim6(int *); 134236592Sobrienstatic int socket_send(struct socket *, struct mbuf *, 135236592Sobrien struct sockaddr_in6 *); 136236592Sobrien 137236592Sobrienextern int in6_mcast_loop; 138236592Sobrienextern struct domain inet6domain; 139236592Sobrien 140236592Sobrienstatic const struct encaptab *pim6_encap_cookie; 141236592Sobrienstatic const struct ip6protosw in6_pim_protosw = { 142236592Sobrien .pr_type = SOCK_RAW, 143236592Sobrien .pr_domain = &inet6domain, 144236592Sobrien .pr_protocol = IPPROTO_PIM, 145236592Sobrien .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR, 146236592Sobrien .pr_input = pim6_input, 147236592Sobrien .pr_output = rip6_output, 148236592Sobrien .pr_ctloutput = rip6_ctloutput, 149236592Sobrien .pr_usrreqs = &rip6_usrreqs 150236592Sobrien}; 151236592Sobrienstatic int pim6_encapcheck(const struct mbuf *, int, int, void *); 152236592Sobrien 153236592Sobrienstatic VNET_DEFINE(int, ip6_mrouter_ver) = 0; 154236592Sobrien#define V_ip6_mrouter_ver VNET(ip6_mrouter_ver) 155236592Sobrien 156236592SobrienSYSCTL_DECL(_net_inet6); 157236592SobrienSYSCTL_DECL(_net_inet6_ip6); 158236592Sobrienstatic SYSCTL_NODE(_net_inet6, IPPROTO_PIM, pim, CTLFLAG_RW, 0, "PIM"); 159236592Sobrien 160236592Sobrienstatic struct mrt6stat mrt6stat; 161236592SobrienSYSCTL_STRUCT(_net_inet6_ip6, OID_AUTO, mrt6stat, CTLFLAG_RW, 162236592Sobrien &mrt6stat, mrt6stat, 163236592Sobrien "Multicast Routing Statistics (struct mrt6stat, netinet6/ip6_mroute.h)"); 164236592Sobrien 165236592Sobrien#define MRT6STAT_INC(name) mrt6stat.name += 1 166236592Sobrien#define NO_RTE_FOUND 0x1 167236592Sobrien#define RTE_FOUND 0x2 168236592Sobrien 169236592Sobrienstatic struct mtx mrouter6_mtx; 170236592Sobrien#define MROUTER6_LOCK() mtx_lock(&mrouter6_mtx) 171236592Sobrien#define MROUTER6_UNLOCK() mtx_unlock(&mrouter6_mtx) 172236592Sobrien#define MROUTER6_LOCK_ASSERT() do { \ 173236592Sobrien mtx_assert(&mrouter6_mtx, MA_OWNED); \ 174236592Sobrien NET_ASSERT_GIANT(); \ 175236592Sobrien} while (0) 176236592Sobrien#define MROUTER6_LOCK_INIT() \ 177236592Sobrien mtx_init(&mrouter6_mtx, "IPv6 multicast forwarding", NULL, MTX_DEF) 178236592Sobrien#define MROUTER6_LOCK_DESTROY() mtx_destroy(&mrouter6_mtx) 179236592Sobrien 180236592Sobrienstatic struct mf6c *mf6ctable[MF6CTBLSIZ]; 181236592SobrienSYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mf6ctable, CTLFLAG_RD, 182236592Sobrien &mf6ctable, sizeof(mf6ctable), "S,*mf6ctable[MF6CTBLSIZ]", 183236592Sobrien "IPv6 Multicast Forwarding Table (struct *mf6ctable[MF6CTBLSIZ], " 184236592Sobrien "netinet6/ip6_mroute.h)"); 185236592Sobrien 186236592Sobrienstatic struct mtx mfc6_mtx; 187236592Sobrien#define MFC6_LOCK() mtx_lock(&mfc6_mtx) 188236592Sobrien#define MFC6_UNLOCK() mtx_unlock(&mfc6_mtx) 189236592Sobrien#define MFC6_LOCK_ASSERT() do { \ 190236592Sobrien mtx_assert(&mfc6_mtx, MA_OWNED); \ 191236592Sobrien NET_ASSERT_GIANT(); \ 192236592Sobrien} while (0) 193236592Sobrien#define MFC6_LOCK_INIT() \ 194236592Sobrien mtx_init(&mfc6_mtx, "IPv6 multicast forwarding cache", NULL, MTX_DEF) 195236592Sobrien#define MFC6_LOCK_DESTROY() mtx_destroy(&mfc6_mtx) 196236592Sobrien 197236592Sobrienstatic u_char n6expire[MF6CTBLSIZ]; 198236592Sobrien 199236592Sobrienstatic struct mif6 mif6table[MAXMIFS]; 200236592SobrienSYSCTL_OPAQUE(_net_inet6_ip6, OID_AUTO, mif6table, CTLFLAG_RD, 201236592Sobrien &mif6table, sizeof(mif6table), "S,mif6[MAXMIFS]", 202236592Sobrien "IPv6 Multicast Interfaces (struct mif6[MAXMIFS], netinet6/ip6_mroute.h)"); 203236592Sobrien 204236592Sobrienstatic struct mtx mif6_mtx; 205236592Sobrien#define MIF6_LOCK() mtx_lock(&mif6_mtx) 206236592Sobrien#define MIF6_UNLOCK() mtx_unlock(&mif6_mtx) 207236592Sobrien#define MIF6_LOCK_ASSERT() mtx_assert(&mif6_mtx, MA_OWNED) 208236592Sobrien#define MIF6_LOCK_INIT() \ 209236592Sobrien mtx_init(&mif6_mtx, "IPv6 multicast interfaces", NULL, MTX_DEF) 210236592Sobrien#define MIF6_LOCK_DESTROY() mtx_destroy(&mif6_mtx) 211236592Sobrien 212236592Sobrien#ifdef MRT6DEBUG 213236592Sobrienstatic VNET_DEFINE(u_int, mrt6debug) = 0; /* debug level */ 214236592Sobrien#define V_mrt6debug VNET(mrt6debug) 215236592Sobrien#define DEBUG_MFC 0x02 216236592Sobrien#define DEBUG_FORWARD 0x04 217236592Sobrien#define DEBUG_EXPIRE 0x08 218236592Sobrien#define DEBUG_XMIT 0x10 219236592Sobrien#define DEBUG_REG 0x20 220236592Sobrien#define DEBUG_PIM 0x40 221236592Sobrien#endif 222236592Sobrien 223236592Sobrienstatic void expire_upcalls(void *); 224236592Sobrien#define EXPIRE_TIMEOUT (hz / 4) /* 4x / second */ 225236592Sobrien#define UPCALL_EXPIRE 6 /* number of timeouts */ 226236592Sobrien 227236592Sobrien/* 228236592Sobrien * XXX TODO: maintain a count to if_allmulti() calls in struct ifnet. 229236592Sobrien */ 230236592Sobrien 231236592Sobrien/* 232236592Sobrien * 'Interfaces' associated with decapsulator (so we can tell 233236592Sobrien * packets that went through it from ones that get reflected 234236592Sobrien * by a broken gateway). Different from IPv4 register_if, 235236592Sobrien * these interfaces are linked into the system ifnet list, 236236592Sobrien * because per-interface IPv6 statistics are maintained in 237236592Sobrien * ifp->if_afdata. But it does not have any routes point 238236592Sobrien * to them. I.e., packets can't be sent this way. They 239236592Sobrien * only exist as a placeholder for multicast source 240236592Sobrien * verification. 241236592Sobrien */ 242236592Sobrienstatic struct ifnet *multicast_register_if6; 243236592Sobrien 244236592Sobrien#define ENCAP_HOPS 64 245236592Sobrien 246236592Sobrien/* 247236592Sobrien * Private variables. 248236592Sobrien */ 249236592Sobrienstatic mifi_t nummifs = 0; 250236592Sobrienstatic mifi_t reg_mif_num = (mifi_t)-1; 251236592Sobrien 252236592Sobrienstatic struct pim6stat pim6stat; 253236592SobrienSYSCTL_STRUCT(_net_inet6_pim, PIM6CTL_STATS, stats, CTLFLAG_RW, 254236592Sobrien &pim6stat, pim6stat, 255236592Sobrien "PIM Statistics (struct pim6stat, netinet6/pim6_var.h)"); 256236592Sobrien 257236592Sobrien#define PIM6STAT_INC(name) pim6stat.name += 1 258236592Sobrienstatic VNET_DEFINE(int, pim6); 259236592Sobrien#define V_pim6 VNET(pim6) 260236592Sobrien 261236592Sobrien/* 262236592Sobrien * Hash function for a source, group entry 263236592Sobrien */ 264236592Sobrien#define MF6CHASH(a, g) MF6CHASHMOD((a).s6_addr32[0] ^ (a).s6_addr32[1] ^ \ 265236592Sobrien (a).s6_addr32[2] ^ (a).s6_addr32[3] ^ \ 266236592Sobrien (g).s6_addr32[0] ^ (g).s6_addr32[1] ^ \ 267236592Sobrien (g).s6_addr32[2] ^ (g).s6_addr32[3]) 268236592Sobrien 269236592Sobrien/* 270236592Sobrien * Find a route for a given origin IPv6 address and Multicast group address. 271236592Sobrien */ 272236592Sobrien#define MF6CFIND(o, g, rt) do { \ 273236592Sobrien struct mf6c *_rt = mf6ctable[MF6CHASH(o,g)]; \ 274236592Sobrien rt = NULL; \ 275236592Sobrien MRT6STAT_INC(mrt6s_mfc_lookups); \ 276236592Sobrien while (_rt) { \ 277236592Sobrien if (IN6_ARE_ADDR_EQUAL(&_rt->mf6c_origin.sin6_addr, &(o)) && \ 278236592Sobrien IN6_ARE_ADDR_EQUAL(&_rt->mf6c_mcastgrp.sin6_addr, &(g)) && \ 279236592Sobrien (_rt->mf6c_stall == NULL)) { \ 280236592Sobrien rt = _rt; \ 281236592Sobrien break; \ 282236592Sobrien } \ 283236592Sobrien _rt = _rt->mf6c_next; \ 284236592Sobrien } \ 285236592Sobrien if (rt == NULL) { \ 286236592Sobrien MRT6STAT_INC(mrt6s_mfc_misses); \ 287236592Sobrien } \ 288236592Sobrien} while (/*CONSTCOND*/ 0) 289236592Sobrien 290236592Sobrien/* 291236592Sobrien * Macros to compute elapsed time efficiently 292236592Sobrien * Borrowed from Van Jacobson's scheduling code 293236592Sobrien * XXX: replace with timersub() ? 294236592Sobrien */ 295236592Sobrien#define TV_DELTA(a, b, delta) do { \ 296236592Sobrien int xxs; \ 297236592Sobrien \ 298236592Sobrien delta = (a).tv_usec - (b).tv_usec; \ 299236592Sobrien if ((xxs = (a).tv_sec - (b).tv_sec)) { \ 300236592Sobrien switch (xxs) { \ 301236592Sobrien case 2: \ 302236592Sobrien delta += 1000000; \ 303236592Sobrien /* FALLTHROUGH */ \ 304236592Sobrien case 1: \ 305236592Sobrien delta += 1000000; \ 306236592Sobrien break; \ 307236592Sobrien default: \ 308236592Sobrien delta += (1000000 * xxs); \ 309236592Sobrien } \ 310236592Sobrien } \ 311236592Sobrien} while (/*CONSTCOND*/ 0) 312236592Sobrien 313236592Sobrien/* XXX: replace with timercmp(a, b, <) ? */ 314236592Sobrien#define TV_LT(a, b) (((a).tv_usec < (b).tv_usec && \ 315236592Sobrien (a).tv_sec <= (b).tv_sec) || (a).tv_sec < (b).tv_sec) 316236592Sobrien 317236592Sobrien#ifdef UPCALL_TIMING 318236592Sobrien#define UPCALL_MAX 50 319236592Sobrienstatic u_long upcall_data[UPCALL_MAX + 1]; 320236592Sobrienstatic void collate(); 321236592Sobrien#endif /* UPCALL_TIMING */ 322236592Sobrien 323236592Sobrienstatic int ip6_mrouter_init(struct socket *, int, int); 324236592Sobrienstatic int add_m6fc(struct mf6cctl *); 325236592Sobrienstatic int add_m6if(struct mif6ctl *); 326236592Sobrienstatic int del_m6fc(struct mf6cctl *); 327236592Sobrienstatic int del_m6if(mifi_t *); 328236592Sobrienstatic int del_m6if_locked(mifi_t *); 329236592Sobrienstatic int get_mif6_cnt(struct sioc_mif_req6 *); 330236592Sobrienstatic int get_sg_cnt(struct sioc_sg_req6 *); 331236592Sobrien 332236592Sobrienstatic struct callout expire_upcalls_ch; 333236592Sobrien 334236592Sobrienint X_ip6_mforward(struct ip6_hdr *, struct ifnet *, struct mbuf *); 335236592Sobrienint X_ip6_mrouter_done(void); 336236592Sobrienint X_ip6_mrouter_set(struct socket *, struct sockopt *); 337236592Sobrienint X_ip6_mrouter_get(struct socket *, struct sockopt *); 338236592Sobrienint X_mrt6_ioctl(u_long, caddr_t); 339236592Sobrien 340236592Sobrien/* 341236592Sobrien * Handle MRT setsockopt commands to modify the multicast routing tables. 342236592Sobrien */ 343236592Sobrienint 344236592SobrienX_ip6_mrouter_set(struct socket *so, struct sockopt *sopt) 345236592Sobrien{ 346236592Sobrien int error = 0; 347236592Sobrien int optval; 348236592Sobrien struct mif6ctl mifc; 349236592Sobrien struct mf6cctl mfcc; 350236592Sobrien mifi_t mifi; 351236592Sobrien 352236592Sobrien if (so != V_ip6_mrouter && sopt->sopt_name != MRT6_INIT) 353236592Sobrien return (EACCES); 354236592Sobrien 355236592Sobrien switch (sopt->sopt_name) { 356236592Sobrien case MRT6_INIT: 357236592Sobrien#ifdef MRT6_OINIT 358236592Sobrien case MRT6_OINIT: 359236592Sobrien#endif 360236592Sobrien error = sooptcopyin(sopt, &optval, sizeof(optval), 361236592Sobrien sizeof(optval)); 362236592Sobrien if (error) 363236592Sobrien break; 364236592Sobrien error = ip6_mrouter_init(so, optval, sopt->sopt_name); 365236592Sobrien break; 366236592Sobrien case MRT6_DONE: 367236592Sobrien error = X_ip6_mrouter_done(); 368236592Sobrien break; 369236592Sobrien case MRT6_ADD_MIF: 370236592Sobrien error = sooptcopyin(sopt, &mifc, sizeof(mifc), sizeof(mifc)); 371236592Sobrien if (error) 372236592Sobrien break; 373236592Sobrien error = add_m6if(&mifc); 374236592Sobrien break; 375236592Sobrien case MRT6_ADD_MFC: 376236592Sobrien error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 377236592Sobrien if (error) 378236592Sobrien break; 379236592Sobrien error = add_m6fc(&mfcc); 380236592Sobrien break; 381236592Sobrien case MRT6_DEL_MFC: 382236592Sobrien error = sooptcopyin(sopt, &mfcc, sizeof(mfcc), sizeof(mfcc)); 383236592Sobrien if (error) 384236592Sobrien break; 385236592Sobrien error = del_m6fc(&mfcc); 386236592Sobrien break; 387236592Sobrien case MRT6_DEL_MIF: 388236592Sobrien error = sooptcopyin(sopt, &mifi, sizeof(mifi), sizeof(mifi)); 389236592Sobrien if (error) 390236592Sobrien break; 391236592Sobrien error = del_m6if(&mifi); 392236592Sobrien break; 393236592Sobrien case MRT6_PIM: 394236592Sobrien error = sooptcopyin(sopt, &optval, sizeof(optval), 395236592Sobrien sizeof(optval)); 396236592Sobrien if (error) 397236592Sobrien break; 398236592Sobrien error = set_pim6(&optval); 399236592Sobrien break; 400236592Sobrien default: 401236592Sobrien error = EOPNOTSUPP; 402236592Sobrien break; 403236592Sobrien } 404236592Sobrien 405236592Sobrien return (error); 406236592Sobrien} 407236592Sobrien 408236592Sobrien/* 409236592Sobrien * Handle MRT getsockopt commands 410236592Sobrien */ 411236592Sobrienint 412236592SobrienX_ip6_mrouter_get(struct socket *so, struct sockopt *sopt) 413236592Sobrien{ 414236592Sobrien int error = 0; 415236592Sobrien 416236592Sobrien if (so != V_ip6_mrouter) 417236592Sobrien return (EACCES); 418236592Sobrien 419236592Sobrien switch (sopt->sopt_name) { 420236592Sobrien case MRT6_PIM: 421236592Sobrien error = sooptcopyout(sopt, &V_pim6, sizeof(V_pim6)); 422236592Sobrien break; 423236592Sobrien } 424236592Sobrien return (error); 425236592Sobrien} 426236592Sobrien 427236592Sobrien/* 428236592Sobrien * Handle ioctl commands to obtain information from the cache 429236592Sobrien */ 430236592Sobrienint 431236592SobrienX_mrt6_ioctl(u_long cmd, caddr_t data) 432236592Sobrien{ 433236592Sobrien int ret; 434236592Sobrien 435236592Sobrien ret = EINVAL; 436236592Sobrien 437236592Sobrien switch (cmd) { 438236592Sobrien case SIOCGETSGCNT_IN6: 439236592Sobrien ret = get_sg_cnt((struct sioc_sg_req6 *)data); 440236592Sobrien break; 441236592Sobrien 442236592Sobrien case SIOCGETMIFCNT_IN6: 443236592Sobrien ret = get_mif6_cnt((struct sioc_mif_req6 *)data); 444236592Sobrien break; 445236592Sobrien 446236592Sobrien default: 447236592Sobrien break; 448236592Sobrien } 449236592Sobrien 450236592Sobrien return (ret); 451236592Sobrien} 452236592Sobrien 453236592Sobrien/* 454236592Sobrien * returns the packet, byte, rpf-failure count for the source group provided 455236592Sobrien */ 456236592Sobrienstatic int 457236592Sobrienget_sg_cnt(struct sioc_sg_req6 *req) 458236592Sobrien{ 459236592Sobrien struct mf6c *rt; 460236592Sobrien int ret; 461236592Sobrien 462236592Sobrien ret = 0; 463236592Sobrien 464236592Sobrien MFC6_LOCK(); 465236592Sobrien 466236592Sobrien MF6CFIND(req->src.sin6_addr, req->grp.sin6_addr, rt); 467236592Sobrien if (rt == NULL) { 468236592Sobrien ret = ESRCH; 469236592Sobrien } else { 470236592Sobrien req->pktcnt = rt->mf6c_pkt_cnt; 471236592Sobrien req->bytecnt = rt->mf6c_byte_cnt; 472236592Sobrien req->wrong_if = rt->mf6c_wrong_if; 473236592Sobrien } 474236592Sobrien 475236592Sobrien MFC6_UNLOCK(); 476236592Sobrien 477236592Sobrien return (ret); 478236592Sobrien} 479236592Sobrien 480236592Sobrien/* 481236592Sobrien * returns the input and output packet and byte counts on the mif provided 482236592Sobrien */ 483236592Sobrienstatic int 484236592Sobrienget_mif6_cnt(struct sioc_mif_req6 *req) 485236592Sobrien{ 486236592Sobrien mifi_t mifi; 487236592Sobrien int ret; 488236592Sobrien 489236592Sobrien ret = 0; 490236592Sobrien mifi = req->mifi; 491236592Sobrien 492236592Sobrien MIF6_LOCK(); 493236592Sobrien 494236592Sobrien if (mifi >= nummifs) { 495236592Sobrien ret = EINVAL; 496236592Sobrien } else { 497236592Sobrien req->icount = mif6table[mifi].m6_pkt_in; 498236592Sobrien req->ocount = mif6table[mifi].m6_pkt_out; 499236592Sobrien req->ibytes = mif6table[mifi].m6_bytes_in; 500236592Sobrien req->obytes = mif6table[mifi].m6_bytes_out; 501236592Sobrien } 502236592Sobrien 503236592Sobrien MIF6_UNLOCK(); 504236592Sobrien 505236592Sobrien return (ret); 506236592Sobrien} 507236592Sobrien 508236592Sobrienstatic int 509236592Sobrienset_pim6(int *i) 510236592Sobrien{ 511236592Sobrien if ((*i != 1) && (*i != 0)) 512236592Sobrien return (EINVAL); 513236592Sobrien 514236592Sobrien V_pim6 = *i; 515236592Sobrien 516236592Sobrien return (0); 517236592Sobrien} 518236592Sobrien 519236592Sobrien/* 520236592Sobrien * Enable multicast routing 521236592Sobrien */ 522236592Sobrienstatic int 523236592Sobrienip6_mrouter_init(struct socket *so, int v, int cmd) 524236592Sobrien{ 525236592Sobrien 526236592Sobrien#ifdef MRT6DEBUG 527236592Sobrien if (V_mrt6debug) 528236592Sobrien log(LOG_DEBUG, 529236592Sobrien "ip6_mrouter_init: so_type = %d, pr_protocol = %d\n", 530236592Sobrien so->so_type, so->so_proto->pr_protocol); 531236592Sobrien#endif 532236592Sobrien 533236592Sobrien if (so->so_type != SOCK_RAW || 534236592Sobrien so->so_proto->pr_protocol != IPPROTO_ICMPV6) 535236592Sobrien return (EOPNOTSUPP); 536236592Sobrien 537236592Sobrien if (v != 1) 538236592Sobrien return (ENOPROTOOPT); 539236592Sobrien 540236592Sobrien MROUTER6_LOCK(); 541236592Sobrien 542236592Sobrien if (V_ip6_mrouter != NULL) { 543236592Sobrien MROUTER6_UNLOCK(); 544236592Sobrien return (EADDRINUSE); 545236592Sobrien } 546236592Sobrien 547236592Sobrien V_ip6_mrouter = so; 548236592Sobrien V_ip6_mrouter_ver = cmd; 549236592Sobrien 550236592Sobrien bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 551236592Sobrien bzero((caddr_t)n6expire, sizeof(n6expire)); 552236592Sobrien 553236592Sobrien V_pim6 = 0;/* used for stubbing out/in pim stuff */ 554236592Sobrien 555236592Sobrien callout_init(&expire_upcalls_ch, 0); 556236592Sobrien callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 557236592Sobrien expire_upcalls, NULL); 558236592Sobrien 559236592Sobrien MROUTER6_UNLOCK(); 560236592Sobrien 561236592Sobrien#ifdef MRT6DEBUG 562236592Sobrien if (V_mrt6debug) 563236592Sobrien log(LOG_DEBUG, "ip6_mrouter_init\n"); 564236592Sobrien#endif 565236592Sobrien 566236592Sobrien return (0); 567236592Sobrien} 568236592Sobrien 569236592Sobrien/* 570236592Sobrien * Disable IPv6 multicast forwarding. 571236592Sobrien */ 572236592Sobrienint 573236592SobrienX_ip6_mrouter_done(void) 574236592Sobrien{ 575236592Sobrien mifi_t mifi; 576236592Sobrien int i; 577236592Sobrien struct mf6c *rt; 578236592Sobrien struct rtdetq *rte; 579236592Sobrien 580236592Sobrien MROUTER6_LOCK(); 581236592Sobrien 582236592Sobrien if (V_ip6_mrouter == NULL) { 583236592Sobrien MROUTER6_UNLOCK(); 584236592Sobrien return (EINVAL); 585236592Sobrien } 586236592Sobrien 587236592Sobrien /* 588236592Sobrien * For each phyint in use, disable promiscuous reception of all IPv6 589236592Sobrien * multicasts. 590236592Sobrien */ 591236592Sobrien for (mifi = 0; mifi < nummifs; mifi++) { 592236592Sobrien if (mif6table[mifi].m6_ifp && 593236592Sobrien !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 594236592Sobrien if_allmulti(mif6table[mifi].m6_ifp, 0); 595236592Sobrien } 596236592Sobrien } 597236592Sobrien bzero((caddr_t)mif6table, sizeof(mif6table)); 598236592Sobrien nummifs = 0; 599236592Sobrien 600236592Sobrien V_pim6 = 0; /* used to stub out/in pim specific code */ 601236592Sobrien 602236592Sobrien callout_stop(&expire_upcalls_ch); 603236592Sobrien 604236592Sobrien /* 605236592Sobrien * Free all multicast forwarding cache entries. 606236592Sobrien */ 607236592Sobrien MFC6_LOCK(); 608236592Sobrien for (i = 0; i < MF6CTBLSIZ; i++) { 609236592Sobrien rt = mf6ctable[i]; 610236592Sobrien while (rt) { 611236592Sobrien struct mf6c *frt; 612236592Sobrien 613236592Sobrien for (rte = rt->mf6c_stall; rte != NULL; ) { 614236592Sobrien struct rtdetq *n = rte->next; 615236592Sobrien 616236592Sobrien m_free(rte->m); 617236592Sobrien free(rte, M_MRTABLE6); 618236592Sobrien rte = n; 619236592Sobrien } 620236592Sobrien frt = rt; 621236592Sobrien rt = rt->mf6c_next; 622236592Sobrien free(frt, M_MRTABLE6); 623236592Sobrien } 624236592Sobrien } 625236592Sobrien bzero((caddr_t)mf6ctable, sizeof(mf6ctable)); 626236592Sobrien MFC6_UNLOCK(); 627236592Sobrien 628236592Sobrien /* 629236592Sobrien * Reset register interface 630236592Sobrien */ 631236592Sobrien if (reg_mif_num != (mifi_t)-1 && multicast_register_if6 != NULL) { 632236592Sobrien if_detach(multicast_register_if6); 633236592Sobrien if_free(multicast_register_if6); 634236592Sobrien reg_mif_num = (mifi_t)-1; 635236592Sobrien multicast_register_if6 = NULL; 636236592Sobrien } 637236592Sobrien 638236592Sobrien V_ip6_mrouter = NULL; 639236592Sobrien V_ip6_mrouter_ver = 0; 640236592Sobrien 641236592Sobrien MROUTER6_UNLOCK(); 642236592Sobrien 643236592Sobrien#ifdef MRT6DEBUG 644236592Sobrien if (V_mrt6debug) 645236592Sobrien log(LOG_DEBUG, "ip6_mrouter_done\n"); 646236592Sobrien#endif 647236592Sobrien 648236592Sobrien return (0); 649236592Sobrien} 650236592Sobrien 651236592Sobrienstatic struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 652236592Sobrien 653236592Sobrien/* 654236592Sobrien * Add a mif to the mif table 655236592Sobrien */ 656236592Sobrienstatic int 657236592Sobrienadd_m6if(struct mif6ctl *mifcp) 658236592Sobrien{ 659236592Sobrien struct mif6 *mifp; 660236592Sobrien struct ifnet *ifp; 661236592Sobrien int error; 662236592Sobrien 663236592Sobrien MIF6_LOCK(); 664236592Sobrien 665236592Sobrien if (mifcp->mif6c_mifi >= MAXMIFS) { 666236592Sobrien MIF6_UNLOCK(); 667236592Sobrien return (EINVAL); 668236592Sobrien } 669236592Sobrien mifp = mif6table + mifcp->mif6c_mifi; 670236592Sobrien if (mifp->m6_ifp != NULL) { 671236592Sobrien MIF6_UNLOCK(); 672236592Sobrien return (EADDRINUSE); /* XXX: is it appropriate? */ 673236592Sobrien } 674236592Sobrien if (mifcp->mif6c_pifi == 0 || mifcp->mif6c_pifi > V_if_index) { 675236592Sobrien MIF6_UNLOCK(); 676236592Sobrien return (ENXIO); 677236592Sobrien } 678236592Sobrien 679236592Sobrien ifp = ifnet_byindex(mifcp->mif6c_pifi); 680236592Sobrien 681236592Sobrien if (mifcp->mif6c_flags & MIFF_REGISTER) { 682236592Sobrien if (reg_mif_num == (mifi_t)-1) { 683236592Sobrien ifp = if_alloc(IFT_OTHER); 684236592Sobrien 685236592Sobrien if_initname(ifp, "register_mif", 0); 686236592Sobrien ifp->if_flags |= IFF_LOOPBACK; 687236592Sobrien if_attach(ifp); 688236592Sobrien multicast_register_if6 = ifp; 689236592Sobrien reg_mif_num = mifcp->mif6c_mifi; 690236592Sobrien /* 691236592Sobrien * it is impossible to guess the ifindex of the 692236592Sobrien * register interface. So mif6c_pifi is automatically 693236592Sobrien * calculated. 694236592Sobrien */ 695236592Sobrien mifcp->mif6c_pifi = ifp->if_index; 696236592Sobrien } else { 697236592Sobrien ifp = multicast_register_if6; 698236592Sobrien } 699236592Sobrien } else { 700236592Sobrien /* Make sure the interface supports multicast */ 701236592Sobrien if ((ifp->if_flags & IFF_MULTICAST) == 0) { 702236592Sobrien MIF6_UNLOCK(); 703236592Sobrien return (EOPNOTSUPP); 704236592Sobrien } 705236592Sobrien 706236592Sobrien error = if_allmulti(ifp, 1); 707236592Sobrien if (error) { 708236592Sobrien MIF6_UNLOCK(); 709236592Sobrien return (error); 710236592Sobrien } 711236592Sobrien } 712236592Sobrien 713236592Sobrien mifp->m6_flags = mifcp->mif6c_flags; 714236592Sobrien mifp->m6_ifp = ifp; 715236592Sobrien 716236592Sobrien /* initialize per mif pkt counters */ 717236592Sobrien mifp->m6_pkt_in = 0; 718236592Sobrien mifp->m6_pkt_out = 0; 719236592Sobrien mifp->m6_bytes_in = 0; 720236592Sobrien mifp->m6_bytes_out = 0; 721236592Sobrien 722236592Sobrien /* Adjust nummifs up if the mifi is higher than nummifs */ 723236592Sobrien if (nummifs <= mifcp->mif6c_mifi) 724236592Sobrien nummifs = mifcp->mif6c_mifi + 1; 725236592Sobrien 726236592Sobrien MIF6_UNLOCK(); 727236592Sobrien 728236592Sobrien#ifdef MRT6DEBUG 729236592Sobrien if (V_mrt6debug) 730236592Sobrien log(LOG_DEBUG, 731236592Sobrien "add_mif #%d, phyint %s\n", 732236592Sobrien mifcp->mif6c_mifi, 733236592Sobrien ifp->if_xname); 734236592Sobrien#endif 735236592Sobrien 736236592Sobrien return (0); 737236592Sobrien} 738236592Sobrien 739236592Sobrien/* 740236592Sobrien * Delete a mif from the mif table 741236592Sobrien */ 742236592Sobrienstatic int 743236592Sobriendel_m6if_locked(mifi_t *mifip) 744236592Sobrien{ 745236592Sobrien struct mif6 *mifp = mif6table + *mifip; 746236592Sobrien mifi_t mifi; 747 struct ifnet *ifp; 748 749 MIF6_LOCK_ASSERT(); 750 751 if (*mifip >= nummifs) 752 return (EINVAL); 753 if (mifp->m6_ifp == NULL) 754 return (EINVAL); 755 756 if (!(mifp->m6_flags & MIFF_REGISTER)) { 757 /* XXX: TODO: Maintain an ALLMULTI refcount in struct ifnet. */ 758 ifp = mifp->m6_ifp; 759 if_allmulti(ifp, 0); 760 } else { 761 if (reg_mif_num != (mifi_t)-1 && 762 multicast_register_if6 != NULL) { 763 if_detach(multicast_register_if6); 764 if_free(multicast_register_if6); 765 reg_mif_num = (mifi_t)-1; 766 multicast_register_if6 = NULL; 767 } 768 } 769 770 bzero((caddr_t)mifp, sizeof(*mifp)); 771 772 /* Adjust nummifs down */ 773 for (mifi = nummifs; mifi > 0; mifi--) 774 if (mif6table[mifi - 1].m6_ifp) 775 break; 776 nummifs = mifi; 777 778#ifdef MRT6DEBUG 779 if (V_mrt6debug) 780 log(LOG_DEBUG, "del_m6if %d, nummifs %d\n", *mifip, nummifs); 781#endif 782 783 return (0); 784} 785 786static int 787del_m6if(mifi_t *mifip) 788{ 789 int cc; 790 791 MIF6_LOCK(); 792 cc = del_m6if_locked(mifip); 793 MIF6_UNLOCK(); 794 795 return (cc); 796} 797 798/* 799 * Add an mfc entry 800 */ 801static int 802add_m6fc(struct mf6cctl *mfccp) 803{ 804 struct mf6c *rt; 805 u_long hash; 806 struct rtdetq *rte; 807 u_short nstl; 808 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 809 810 MFC6_LOCK(); 811 812 MF6CFIND(mfccp->mf6cc_origin.sin6_addr, 813 mfccp->mf6cc_mcastgrp.sin6_addr, rt); 814 815 /* If an entry already exists, just update the fields */ 816 if (rt) { 817#ifdef MRT6DEBUG 818 if (V_mrt6debug & DEBUG_MFC) { 819 log(LOG_DEBUG, 820 "add_m6fc no upcall h %d o %s g %s p %x\n", 821 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 822 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 823 mfccp->mf6cc_parent); 824 } 825#endif 826 827 rt->mf6c_parent = mfccp->mf6cc_parent; 828 rt->mf6c_ifset = mfccp->mf6cc_ifset; 829 830 MFC6_UNLOCK(); 831 return (0); 832 } 833 834 /* 835 * Find the entry for which the upcall was made and update 836 */ 837 hash = MF6CHASH(mfccp->mf6cc_origin.sin6_addr, 838 mfccp->mf6cc_mcastgrp.sin6_addr); 839 for (rt = mf6ctable[hash], nstl = 0; rt; rt = rt->mf6c_next) { 840 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 841 &mfccp->mf6cc_origin.sin6_addr) && 842 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 843 &mfccp->mf6cc_mcastgrp.sin6_addr) && 844 (rt->mf6c_stall != NULL)) { 845 846 if (nstl++) 847 log(LOG_ERR, 848 "add_m6fc: %s o %s g %s p %x dbx %p\n", 849 "multiple kernel entries", 850 ip6_sprintf(ip6bufo, 851 &mfccp->mf6cc_origin.sin6_addr), 852 ip6_sprintf(ip6bufg, 853 &mfccp->mf6cc_mcastgrp.sin6_addr), 854 mfccp->mf6cc_parent, rt->mf6c_stall); 855 856#ifdef MRT6DEBUG 857 if (V_mrt6debug & DEBUG_MFC) 858 log(LOG_DEBUG, 859 "add_m6fc o %s g %s p %x dbg %x\n", 860 ip6_sprintf(ip6bufo, 861 &mfccp->mf6cc_origin.sin6_addr), 862 ip6_sprintf(ip6bufg, 863 &mfccp->mf6cc_mcastgrp.sin6_addr), 864 mfccp->mf6cc_parent, rt->mf6c_stall); 865#endif 866 867 rt->mf6c_origin = mfccp->mf6cc_origin; 868 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 869 rt->mf6c_parent = mfccp->mf6cc_parent; 870 rt->mf6c_ifset = mfccp->mf6cc_ifset; 871 /* initialize pkt counters per src-grp */ 872 rt->mf6c_pkt_cnt = 0; 873 rt->mf6c_byte_cnt = 0; 874 rt->mf6c_wrong_if = 0; 875 876 rt->mf6c_expire = 0; /* Don't clean this guy up */ 877 n6expire[hash]--; 878 879 /* free packets Qed at the end of this entry */ 880 for (rte = rt->mf6c_stall; rte != NULL; ) { 881 struct rtdetq *n = rte->next; 882 ip6_mdq(rte->m, rte->ifp, rt); 883 m_freem(rte->m); 884#ifdef UPCALL_TIMING 885 collate(&(rte->t)); 886#endif /* UPCALL_TIMING */ 887 free(rte, M_MRTABLE6); 888 rte = n; 889 } 890 rt->mf6c_stall = NULL; 891 } 892 } 893 894 /* 895 * It is possible that an entry is being inserted without an upcall 896 */ 897 if (nstl == 0) { 898#ifdef MRT6DEBUG 899 if (V_mrt6debug & DEBUG_MFC) 900 log(LOG_DEBUG, 901 "add_mfc no upcall h %d o %s g %s p %x\n", 902 hash, 903 ip6_sprintf(ip6bufo, &mfccp->mf6cc_origin.sin6_addr), 904 ip6_sprintf(ip6bufg, &mfccp->mf6cc_mcastgrp.sin6_addr), 905 mfccp->mf6cc_parent); 906#endif 907 908 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 909 910 if (IN6_ARE_ADDR_EQUAL(&rt->mf6c_origin.sin6_addr, 911 &mfccp->mf6cc_origin.sin6_addr)&& 912 IN6_ARE_ADDR_EQUAL(&rt->mf6c_mcastgrp.sin6_addr, 913 &mfccp->mf6cc_mcastgrp.sin6_addr)) { 914 915 rt->mf6c_origin = mfccp->mf6cc_origin; 916 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 917 rt->mf6c_parent = mfccp->mf6cc_parent; 918 rt->mf6c_ifset = mfccp->mf6cc_ifset; 919 /* initialize pkt counters per src-grp */ 920 rt->mf6c_pkt_cnt = 0; 921 rt->mf6c_byte_cnt = 0; 922 rt->mf6c_wrong_if = 0; 923 924 if (rt->mf6c_expire) 925 n6expire[hash]--; 926 rt->mf6c_expire = 0; 927 } 928 } 929 if (rt == NULL) { 930 /* no upcall, so make a new entry */ 931 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 932 M_NOWAIT); 933 if (rt == NULL) { 934 MFC6_UNLOCK(); 935 return (ENOBUFS); 936 } 937 938 /* insert new entry at head of hash chain */ 939 rt->mf6c_origin = mfccp->mf6cc_origin; 940 rt->mf6c_mcastgrp = mfccp->mf6cc_mcastgrp; 941 rt->mf6c_parent = mfccp->mf6cc_parent; 942 rt->mf6c_ifset = mfccp->mf6cc_ifset; 943 /* initialize pkt counters per src-grp */ 944 rt->mf6c_pkt_cnt = 0; 945 rt->mf6c_byte_cnt = 0; 946 rt->mf6c_wrong_if = 0; 947 rt->mf6c_expire = 0; 948 rt->mf6c_stall = NULL; 949 950 /* link into table */ 951 rt->mf6c_next = mf6ctable[hash]; 952 mf6ctable[hash] = rt; 953 } 954 } 955 956 MFC6_UNLOCK(); 957 return (0); 958} 959 960#ifdef UPCALL_TIMING 961/* 962 * collect delay statistics on the upcalls 963 */ 964static void 965collate(struct timeval *t) 966{ 967 u_long d; 968 struct timeval tp; 969 u_long delta; 970 971 GET_TIME(tp); 972 973 if (TV_LT(*t, tp)) 974 { 975 TV_DELTA(tp, *t, delta); 976 977 d = delta >> 10; 978 if (d > UPCALL_MAX) 979 d = UPCALL_MAX; 980 981 ++upcall_data[d]; 982 } 983} 984#endif /* UPCALL_TIMING */ 985 986/* 987 * Delete an mfc entry 988 */ 989static int 990del_m6fc(struct mf6cctl *mfccp) 991{ 992 struct sockaddr_in6 origin; 993 struct sockaddr_in6 mcastgrp; 994 struct mf6c *rt; 995 struct mf6c **nptr; 996 u_long hash; 997 998 origin = mfccp->mf6cc_origin; 999 mcastgrp = mfccp->mf6cc_mcastgrp; 1000 hash = MF6CHASH(origin.sin6_addr, mcastgrp.sin6_addr); 1001 1002#ifdef MRT6DEBUG 1003 if (V_mrt6debug & DEBUG_MFC) { 1004 char ip6bufo[INET6_ADDRSTRLEN], ip6bufg[INET6_ADDRSTRLEN]; 1005 log(LOG_DEBUG,"del_m6fc orig %s mcastgrp %s\n", 1006 ip6_sprintf(ip6bufo, &origin.sin6_addr), 1007 ip6_sprintf(ip6bufg, &mcastgrp.sin6_addr)); 1008 } 1009#endif 1010 1011 MFC6_LOCK(); 1012 1013 nptr = &mf6ctable[hash]; 1014 while ((rt = *nptr) != NULL) { 1015 if (IN6_ARE_ADDR_EQUAL(&origin.sin6_addr, 1016 &rt->mf6c_origin.sin6_addr) && 1017 IN6_ARE_ADDR_EQUAL(&mcastgrp.sin6_addr, 1018 &rt->mf6c_mcastgrp.sin6_addr) && 1019 rt->mf6c_stall == NULL) 1020 break; 1021 1022 nptr = &rt->mf6c_next; 1023 } 1024 if (rt == NULL) { 1025 MFC6_UNLOCK(); 1026 return (EADDRNOTAVAIL); 1027 } 1028 1029 *nptr = rt->mf6c_next; 1030 free(rt, M_MRTABLE6); 1031 1032 MFC6_UNLOCK(); 1033 1034 return (0); 1035} 1036 1037static int 1038socket_send(struct socket *s, struct mbuf *mm, struct sockaddr_in6 *src) 1039{ 1040 1041 if (s) { 1042 if (sbappendaddr(&s->so_rcv, 1043 (struct sockaddr *)src, 1044 mm, (struct mbuf *)0) != 0) { 1045 sorwakeup(s); 1046 return (0); 1047 } 1048 } 1049 m_freem(mm); 1050 return (-1); 1051} 1052 1053/* 1054 * IPv6 multicast forwarding function. This function assumes that the packet 1055 * pointed to by "ip6" has arrived on (or is about to be sent to) the interface 1056 * pointed to by "ifp", and the packet is to be relayed to other networks 1057 * that have members of the packet's destination IPv6 multicast group. 1058 * 1059 * The packet is returned unscathed to the caller, unless it is 1060 * erroneous, in which case a non-zero return value tells the caller to 1061 * discard it. 1062 * 1063 * NOTE: this implementation assumes that m->m_pkthdr.rcvif is NULL iff 1064 * this function is called in the originating context (i.e., not when 1065 * forwarding a packet from other node). ip6_output(), which is currently the 1066 * only function that calls this function is called in the originating context, 1067 * explicitly ensures this condition. It is caller's responsibility to ensure 1068 * that if this function is called from somewhere else in the originating 1069 * context in the future. 1070 */ 1071int 1072X_ip6_mforward(struct ip6_hdr *ip6, struct ifnet *ifp, struct mbuf *m) 1073{ 1074 struct mf6c *rt; 1075 struct mif6 *mifp; 1076 struct mbuf *mm; 1077 mifi_t mifi; 1078 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1079 1080#ifdef MRT6DEBUG 1081 if (V_mrt6debug & DEBUG_FORWARD) 1082 log(LOG_DEBUG, "ip6_mforward: src %s, dst %s, ifindex %d\n", 1083 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1084 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1085 ifp->if_index); 1086#endif 1087 1088 /* 1089 * Don't forward a packet with Hop limit of zero or one, 1090 * or a packet destined to a local-only group. 1091 */ 1092 if (ip6->ip6_hlim <= 1 || IN6_IS_ADDR_MC_INTFACELOCAL(&ip6->ip6_dst) || 1093 IN6_IS_ADDR_MC_LINKLOCAL(&ip6->ip6_dst)) 1094 return (0); 1095 ip6->ip6_hlim--; 1096 1097 /* 1098 * Source address check: do not forward packets with unspecified 1099 * source. It was discussed in July 2000, on ipngwg mailing list. 1100 * This is rather more serious than unicast cases, because some 1101 * MLD packets can be sent with the unspecified source address 1102 * (although such packets must normally set 1 to the hop limit field). 1103 */ 1104 if (IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_src)) { 1105 IP6STAT_INC(ip6s_cantforward); 1106 if (V_ip6_log_time + V_ip6_log_interval < time_second) { 1107 V_ip6_log_time = time_second; 1108 log(LOG_DEBUG, 1109 "cannot forward " 1110 "from %s to %s nxt %d received on %s\n", 1111 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1112 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1113 ip6->ip6_nxt, 1114 if_name(m->m_pkthdr.rcvif)); 1115 } 1116 return (0); 1117 } 1118 1119 MFC6_LOCK(); 1120 1121 /* 1122 * Determine forwarding mifs from the forwarding cache table 1123 */ 1124 MF6CFIND(ip6->ip6_src, ip6->ip6_dst, rt); 1125 1126 /* Entry exists, so forward if necessary */ 1127 if (rt) { 1128 MFC6_UNLOCK(); 1129 return (ip6_mdq(m, ifp, rt)); 1130 } else { 1131 /* 1132 * If we don't have a route for packet's origin, 1133 * Make a copy of the packet & 1134 * send message to routing daemon 1135 */ 1136 1137 struct mbuf *mb0; 1138 struct rtdetq *rte; 1139 u_long hash; 1140/* int i, npkts;*/ 1141#ifdef UPCALL_TIMING 1142 struct timeval tp; 1143 1144 GET_TIME(tp); 1145#endif /* UPCALL_TIMING */ 1146 1147 MRT6STAT_INC(mrt6s_no_route); 1148#ifdef MRT6DEBUG 1149 if (V_mrt6debug & (DEBUG_FORWARD | DEBUG_MFC)) 1150 log(LOG_DEBUG, "ip6_mforward: no rte s %s g %s\n", 1151 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1152 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1153#endif 1154 1155 /* 1156 * Allocate mbufs early so that we don't do extra work if we 1157 * are just going to fail anyway. 1158 */ 1159 rte = (struct rtdetq *)malloc(sizeof(*rte), M_MRTABLE6, 1160 M_NOWAIT); 1161 if (rte == NULL) { 1162 MFC6_UNLOCK(); 1163 return (ENOBUFS); 1164 } 1165 mb0 = m_copy(m, 0, M_COPYALL); 1166 /* 1167 * Pullup packet header if needed before storing it, 1168 * as other references may modify it in the meantime. 1169 */ 1170 if (mb0 && 1171 (M_HASCL(mb0) || mb0->m_len < sizeof(struct ip6_hdr))) 1172 mb0 = m_pullup(mb0, sizeof(struct ip6_hdr)); 1173 if (mb0 == NULL) { 1174 free(rte, M_MRTABLE6); 1175 MFC6_UNLOCK(); 1176 return (ENOBUFS); 1177 } 1178 1179 /* is there an upcall waiting for this packet? */ 1180 hash = MF6CHASH(ip6->ip6_src, ip6->ip6_dst); 1181 for (rt = mf6ctable[hash]; rt; rt = rt->mf6c_next) { 1182 if (IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, 1183 &rt->mf6c_origin.sin6_addr) && 1184 IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, 1185 &rt->mf6c_mcastgrp.sin6_addr) && 1186 (rt->mf6c_stall != NULL)) 1187 break; 1188 } 1189 1190 if (rt == NULL) { 1191 struct mrt6msg *im; 1192#ifdef MRT6_OINIT 1193 struct omrt6msg *oim; 1194#endif 1195 1196 /* no upcall, so make a new entry */ 1197 rt = (struct mf6c *)malloc(sizeof(*rt), M_MRTABLE6, 1198 M_NOWAIT); 1199 if (rt == NULL) { 1200 free(rte, M_MRTABLE6); 1201 m_freem(mb0); 1202 MFC6_UNLOCK(); 1203 return (ENOBUFS); 1204 } 1205 /* 1206 * Make a copy of the header to send to the user 1207 * level process 1208 */ 1209 mm = m_copy(mb0, 0, sizeof(struct ip6_hdr)); 1210 1211 if (mm == NULL) { 1212 free(rte, M_MRTABLE6); 1213 m_freem(mb0); 1214 free(rt, M_MRTABLE6); 1215 MFC6_UNLOCK(); 1216 return (ENOBUFS); 1217 } 1218 1219 /* 1220 * Send message to routing daemon 1221 */ 1222 sin6.sin6_addr = ip6->ip6_src; 1223 1224 im = NULL; 1225#ifdef MRT6_OINIT 1226 oim = NULL; 1227#endif 1228 switch (V_ip6_mrouter_ver) { 1229#ifdef MRT6_OINIT 1230 case MRT6_OINIT: 1231 oim = mtod(mm, struct omrt6msg *); 1232 oim->im6_msgtype = MRT6MSG_NOCACHE; 1233 oim->im6_mbz = 0; 1234 break; 1235#endif 1236 case MRT6_INIT: 1237 im = mtod(mm, struct mrt6msg *); 1238 im->im6_msgtype = MRT6MSG_NOCACHE; 1239 im->im6_mbz = 0; 1240 break; 1241 default: 1242 free(rte, M_MRTABLE6); 1243 m_freem(mb0); 1244 free(rt, M_MRTABLE6); 1245 MFC6_UNLOCK(); 1246 return (EINVAL); 1247 } 1248 1249#ifdef MRT6DEBUG 1250 if (V_mrt6debug & DEBUG_FORWARD) 1251 log(LOG_DEBUG, 1252 "getting the iif info in the kernel\n"); 1253#endif 1254 1255 for (mifp = mif6table, mifi = 0; 1256 mifi < nummifs && mifp->m6_ifp != ifp; 1257 mifp++, mifi++) 1258 ; 1259 1260 switch (V_ip6_mrouter_ver) { 1261#ifdef MRT6_OINIT 1262 case MRT6_OINIT: 1263 oim->im6_mif = mifi; 1264 break; 1265#endif 1266 case MRT6_INIT: 1267 im->im6_mif = mifi; 1268 break; 1269 } 1270 1271 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1272 log(LOG_WARNING, "ip6_mforward: ip6_mrouter " 1273 "socket queue full\n"); 1274 MRT6STAT_INC(mrt6s_upq_sockfull); 1275 free(rte, M_MRTABLE6); 1276 m_freem(mb0); 1277 free(rt, M_MRTABLE6); 1278 MFC6_UNLOCK(); 1279 return (ENOBUFS); 1280 } 1281 1282 MRT6STAT_INC(mrt6s_upcalls); 1283 1284 /* insert new entry at head of hash chain */ 1285 bzero(rt, sizeof(*rt)); 1286 rt->mf6c_origin.sin6_family = AF_INET6; 1287 rt->mf6c_origin.sin6_len = sizeof(struct sockaddr_in6); 1288 rt->mf6c_origin.sin6_addr = ip6->ip6_src; 1289 rt->mf6c_mcastgrp.sin6_family = AF_INET6; 1290 rt->mf6c_mcastgrp.sin6_len = sizeof(struct sockaddr_in6); 1291 rt->mf6c_mcastgrp.sin6_addr = ip6->ip6_dst; 1292 rt->mf6c_expire = UPCALL_EXPIRE; 1293 n6expire[hash]++; 1294 rt->mf6c_parent = MF6C_INCOMPLETE_PARENT; 1295 1296 /* link into table */ 1297 rt->mf6c_next = mf6ctable[hash]; 1298 mf6ctable[hash] = rt; 1299 /* Add this entry to the end of the queue */ 1300 rt->mf6c_stall = rte; 1301 } else { 1302 /* determine if q has overflowed */ 1303 struct rtdetq **p; 1304 int npkts = 0; 1305 1306 for (p = &rt->mf6c_stall; *p != NULL; p = &(*p)->next) 1307 if (++npkts > MAX_UPQ6) { 1308 MRT6STAT_INC(mrt6s_upq_ovflw); 1309 free(rte, M_MRTABLE6); 1310 m_freem(mb0); 1311 MFC6_UNLOCK(); 1312 return (0); 1313 } 1314 1315 /* Add this entry to the end of the queue */ 1316 *p = rte; 1317 } 1318 1319 rte->next = NULL; 1320 rte->m = mb0; 1321 rte->ifp = ifp; 1322#ifdef UPCALL_TIMING 1323 rte->t = tp; 1324#endif /* UPCALL_TIMING */ 1325 1326 MFC6_UNLOCK(); 1327 1328 return (0); 1329 } 1330} 1331 1332/* 1333 * Clean up cache entries if upcalls are not serviced 1334 * Call from the Slow Timeout mechanism, every half second. 1335 */ 1336static void 1337expire_upcalls(void *unused) 1338{ 1339 struct rtdetq *rte; 1340 struct mf6c *mfc, **nptr; 1341 int i; 1342 1343 MFC6_LOCK(); 1344 for (i = 0; i < MF6CTBLSIZ; i++) { 1345 if (n6expire[i] == 0) 1346 continue; 1347 nptr = &mf6ctable[i]; 1348 while ((mfc = *nptr) != NULL) { 1349 rte = mfc->mf6c_stall; 1350 /* 1351 * Skip real cache entries 1352 * Make sure it wasn't marked to not expire (shouldn't happen) 1353 * If it expires now 1354 */ 1355 if (rte != NULL && 1356 mfc->mf6c_expire != 0 && 1357 --mfc->mf6c_expire == 0) { 1358#ifdef MRT6DEBUG 1359 if (V_mrt6debug & DEBUG_EXPIRE) { 1360 char ip6bufo[INET6_ADDRSTRLEN]; 1361 char ip6bufg[INET6_ADDRSTRLEN]; 1362 log(LOG_DEBUG, "expire_upcalls: expiring (%s %s)\n", 1363 ip6_sprintf(ip6bufo, &mfc->mf6c_origin.sin6_addr), 1364 ip6_sprintf(ip6bufg, &mfc->mf6c_mcastgrp.sin6_addr)); 1365 } 1366#endif 1367 /* 1368 * drop all the packets 1369 * free the mbuf with the pkt, if, timing info 1370 */ 1371 do { 1372 struct rtdetq *n = rte->next; 1373 m_freem(rte->m); 1374 free(rte, M_MRTABLE6); 1375 rte = n; 1376 } while (rte != NULL); 1377 MRT6STAT_INC(mrt6s_cache_cleanups); 1378 n6expire[i]--; 1379 1380 *nptr = mfc->mf6c_next; 1381 free(mfc, M_MRTABLE6); 1382 } else { 1383 nptr = &mfc->mf6c_next; 1384 } 1385 } 1386 } 1387 MFC6_UNLOCK(); 1388 callout_reset(&expire_upcalls_ch, EXPIRE_TIMEOUT, 1389 expire_upcalls, NULL); 1390} 1391 1392/* 1393 * Packet forwarding routine once entry in the cache is made 1394 */ 1395static int 1396ip6_mdq(struct mbuf *m, struct ifnet *ifp, struct mf6c *rt) 1397{ 1398 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 1399 mifi_t mifi, iif; 1400 struct mif6 *mifp; 1401 int plen = m->m_pkthdr.len; 1402 struct in6_addr src0, dst0; /* copies for local work */ 1403 u_int32_t iszone, idzone, oszone, odzone; 1404 int error = 0; 1405 1406/* 1407 * Macro to send packet on mif. Since RSVP packets don't get counted on 1408 * input, they shouldn't get counted on output, so statistics keeping is 1409 * separate. 1410 */ 1411 1412#define MC6_SEND(ip6, mifp, m) do { \ 1413 if ((mifp)->m6_flags & MIFF_REGISTER) \ 1414 register_send((ip6), (mifp), (m)); \ 1415 else \ 1416 phyint_send((ip6), (mifp), (m)); \ 1417} while (/*CONSTCOND*/ 0) 1418 1419 /* 1420 * Don't forward if it didn't arrive from the parent mif 1421 * for its origin. 1422 */ 1423 mifi = rt->mf6c_parent; 1424 if ((mifi >= nummifs) || (mif6table[mifi].m6_ifp != ifp)) { 1425 /* came in the wrong interface */ 1426#ifdef MRT6DEBUG 1427 if (V_mrt6debug & DEBUG_FORWARD) 1428 log(LOG_DEBUG, 1429 "wrong if: ifid %d mifi %d mififid %x\n", 1430 ifp->if_index, mifi, 1431 mif6table[mifi].m6_ifp->if_index); 1432#endif 1433 MRT6STAT_INC(mrt6s_wrong_if); 1434 rt->mf6c_wrong_if++; 1435 /* 1436 * If we are doing PIM processing, and we are forwarding 1437 * packets on this interface, send a message to the 1438 * routing daemon. 1439 */ 1440 /* have to make sure this is a valid mif */ 1441 if (mifi < nummifs && mif6table[mifi].m6_ifp) 1442 if (V_pim6 && (m->m_flags & M_LOOP) == 0) { 1443 /* 1444 * Check the M_LOOP flag to avoid an 1445 * unnecessary PIM assert. 1446 * XXX: M_LOOP is an ad-hoc hack... 1447 */ 1448 static struct sockaddr_in6 sin6 = 1449 { sizeof(sin6), AF_INET6 }; 1450 1451 struct mbuf *mm; 1452 struct mrt6msg *im; 1453#ifdef MRT6_OINIT 1454 struct omrt6msg *oim; 1455#endif 1456 1457 mm = m_copy(m, 0, sizeof(struct ip6_hdr)); 1458 if (mm && 1459 (M_HASCL(mm) || 1460 mm->m_len < sizeof(struct ip6_hdr))) 1461 mm = m_pullup(mm, sizeof(struct ip6_hdr)); 1462 if (mm == NULL) 1463 return (ENOBUFS); 1464 1465#ifdef MRT6_OINIT 1466 oim = NULL; 1467#endif 1468 im = NULL; 1469 switch (V_ip6_mrouter_ver) { 1470#ifdef MRT6_OINIT 1471 case MRT6_OINIT: 1472 oim = mtod(mm, struct omrt6msg *); 1473 oim->im6_msgtype = MRT6MSG_WRONGMIF; 1474 oim->im6_mbz = 0; 1475 break; 1476#endif 1477 case MRT6_INIT: 1478 im = mtod(mm, struct mrt6msg *); 1479 im->im6_msgtype = MRT6MSG_WRONGMIF; 1480 im->im6_mbz = 0; 1481 break; 1482 default: 1483 m_freem(mm); 1484 return (EINVAL); 1485 } 1486 1487 for (mifp = mif6table, iif = 0; 1488 iif < nummifs && mifp && 1489 mifp->m6_ifp != ifp; 1490 mifp++, iif++) 1491 ; 1492 1493 switch (V_ip6_mrouter_ver) { 1494#ifdef MRT6_OINIT 1495 case MRT6_OINIT: 1496 oim->im6_mif = iif; 1497 sin6.sin6_addr = oim->im6_src; 1498 break; 1499#endif 1500 case MRT6_INIT: 1501 im->im6_mif = iif; 1502 sin6.sin6_addr = im->im6_src; 1503 break; 1504 } 1505 1506 MRT6STAT_INC(mrt6s_upcalls); 1507 1508 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1509#ifdef MRT6DEBUG 1510 if (V_mrt6debug) 1511 log(LOG_WARNING, "mdq, ip6_mrouter socket queue full\n"); 1512#endif 1513 MRT6STAT_INC(mrt6s_upq_sockfull); 1514 return (ENOBUFS); 1515 } /* if socket Q full */ 1516 } /* if PIM */ 1517 return (0); 1518 } /* if wrong iif */ 1519 1520 /* If I sourced this packet, it counts as output, else it was input. */ 1521 if (m->m_pkthdr.rcvif == NULL) { 1522 /* XXX: is rcvif really NULL when output?? */ 1523 mif6table[mifi].m6_pkt_out++; 1524 mif6table[mifi].m6_bytes_out += plen; 1525 } else { 1526 mif6table[mifi].m6_pkt_in++; 1527 mif6table[mifi].m6_bytes_in += plen; 1528 } 1529 rt->mf6c_pkt_cnt++; 1530 rt->mf6c_byte_cnt += plen; 1531 1532 /* 1533 * For each mif, forward a copy of the packet if there are group 1534 * members downstream on the interface. 1535 */ 1536 src0 = ip6->ip6_src; 1537 dst0 = ip6->ip6_dst; 1538 if ((error = in6_setscope(&src0, ifp, &iszone)) != 0 || 1539 (error = in6_setscope(&dst0, ifp, &idzone)) != 0) { 1540 IP6STAT_INC(ip6s_badscope); 1541 return (error); 1542 } 1543 for (mifp = mif6table, mifi = 0; mifi < nummifs; mifp++, mifi++) { 1544 if (IF_ISSET(mifi, &rt->mf6c_ifset)) { 1545 /* 1546 * check if the outgoing packet is going to break 1547 * a scope boundary. 1548 * XXX For packets through PIM register tunnel 1549 * interface, we believe a routing daemon. 1550 */ 1551 if (!(mif6table[rt->mf6c_parent].m6_flags & 1552 MIFF_REGISTER) && 1553 !(mif6table[mifi].m6_flags & MIFF_REGISTER)) { 1554 if (in6_setscope(&src0, mif6table[mifi].m6_ifp, 1555 &oszone) || 1556 in6_setscope(&dst0, mif6table[mifi].m6_ifp, 1557 &odzone) || 1558 iszone != oszone || 1559 idzone != odzone) { 1560 IP6STAT_INC(ip6s_badscope); 1561 continue; 1562 } 1563 } 1564 1565 mifp->m6_pkt_out++; 1566 mifp->m6_bytes_out += plen; 1567 MC6_SEND(ip6, mifp, m); 1568 } 1569 } 1570 return (0); 1571} 1572 1573static void 1574phyint_send(struct ip6_hdr *ip6, struct mif6 *mifp, struct mbuf *m) 1575{ 1576 struct mbuf *mb_copy; 1577 struct ifnet *ifp = mifp->m6_ifp; 1578 int error = 0; 1579 u_long linkmtu; 1580 1581 /* 1582 * Make a new reference to the packet; make sure that 1583 * the IPv6 header is actually copied, not just referenced, 1584 * so that ip6_output() only scribbles on the copy. 1585 */ 1586 mb_copy = m_copy(m, 0, M_COPYALL); 1587 if (mb_copy && 1588 (M_HASCL(mb_copy) || mb_copy->m_len < sizeof(struct ip6_hdr))) 1589 mb_copy = m_pullup(mb_copy, sizeof(struct ip6_hdr)); 1590 if (mb_copy == NULL) { 1591 return; 1592 } 1593 /* set MCAST flag to the outgoing packet */ 1594 mb_copy->m_flags |= M_MCAST; 1595 1596 /* 1597 * If we sourced the packet, call ip6_output since we may devide 1598 * the packet into fragments when the packet is too big for the 1599 * outgoing interface. 1600 * Otherwise, we can simply send the packet to the interface 1601 * sending queue. 1602 */ 1603 if (m->m_pkthdr.rcvif == NULL) { 1604 struct ip6_moptions im6o; 1605 1606 im6o.im6o_multicast_ifp = ifp; 1607 /* XXX: ip6_output will override ip6->ip6_hlim */ 1608 im6o.im6o_multicast_hlim = ip6->ip6_hlim; 1609 im6o.im6o_multicast_loop = 1; 1610 error = ip6_output(mb_copy, NULL, NULL, IPV6_FORWARDING, &im6o, 1611 NULL, NULL); 1612 1613#ifdef MRT6DEBUG 1614 if (V_mrt6debug & DEBUG_XMIT) 1615 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1616 mifp - mif6table, error); 1617#endif 1618 return; 1619 } 1620 1621 /* 1622 * If configured to loop back multicasts by default, 1623 * loop back a copy now. 1624 */ 1625 if (in6_mcast_loop) { 1626 struct sockaddr_in6 dst6; 1627 1628 bzero(&dst6, sizeof(dst6)); 1629 dst6.sin6_len = sizeof(struct sockaddr_in6); 1630 dst6.sin6_family = AF_INET6; 1631 dst6.sin6_addr = ip6->ip6_dst; 1632 ip6_mloopback(ifp, m, &dst6); 1633 } 1634 1635 /* 1636 * Put the packet into the sending queue of the outgoing interface 1637 * if it would fit in the MTU of the interface. 1638 */ 1639 linkmtu = IN6_LINKMTU(ifp); 1640 if (mb_copy->m_pkthdr.len <= linkmtu || linkmtu < IPV6_MMTU) { 1641 struct sockaddr_in6 dst6; 1642 1643 bzero(&dst6, sizeof(dst6)); 1644 dst6.sin6_len = sizeof(struct sockaddr_in6); 1645 dst6.sin6_family = AF_INET6; 1646 dst6.sin6_addr = ip6->ip6_dst; 1647 /* 1648 * We just call if_output instead of nd6_output here, since 1649 * we need no ND for a multicast forwarded packet...right? 1650 */ 1651 error = (*ifp->if_output)(ifp, mb_copy, 1652 (struct sockaddr *)&dst6, NULL); 1653#ifdef MRT6DEBUG 1654 if (V_mrt6debug & DEBUG_XMIT) 1655 log(LOG_DEBUG, "phyint_send on mif %d err %d\n", 1656 mifp - mif6table, error); 1657#endif 1658 } else { 1659 /* 1660 * pMTU discovery is intentionally disabled by default, since 1661 * various router may notify pMTU in multicast, which can be 1662 * a DDoS to a router 1663 */ 1664 if (V_ip6_mcast_pmtu) 1665 icmp6_error(mb_copy, ICMP6_PACKET_TOO_BIG, 0, linkmtu); 1666 else { 1667#ifdef MRT6DEBUG 1668 if (V_mrt6debug & DEBUG_XMIT) { 1669 char ip6bufs[INET6_ADDRSTRLEN]; 1670 char ip6bufd[INET6_ADDRSTRLEN]; 1671 log(LOG_DEBUG, 1672 "phyint_send: packet too big on %s o %s " 1673 "g %s size %d(discarded)\n", 1674 if_name(ifp), 1675 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1676 ip6_sprintf(ip6bufd, &ip6->ip6_dst), 1677 mb_copy->m_pkthdr.len); 1678 } 1679#endif /* MRT6DEBUG */ 1680 m_freem(mb_copy); /* simply discard the packet */ 1681 } 1682 } 1683} 1684 1685static int 1686register_send(struct ip6_hdr *ip6, struct mif6 *mif, struct mbuf *m) 1687{ 1688 struct mbuf *mm; 1689 int i, len = m->m_pkthdr.len; 1690 static struct sockaddr_in6 sin6 = { sizeof(sin6), AF_INET6 }; 1691 struct mrt6msg *im6; 1692 1693#ifdef MRT6DEBUG 1694 if (V_mrt6debug) { 1695 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1696 log(LOG_DEBUG, "** IPv6 register_send **\n src %s dst %s\n", 1697 ip6_sprintf(ip6bufs, &ip6->ip6_src), 1698 ip6_sprintf(ip6bufd, &ip6->ip6_dst)); 1699 } 1700#endif 1701 PIM6STAT_INC(pim6s_snd_registers); 1702 1703 /* Make a copy of the packet to send to the user level process */ 1704 MGETHDR(mm, M_DONTWAIT, MT_HEADER); 1705 if (mm == NULL) 1706 return (ENOBUFS); 1707 mm->m_pkthdr.rcvif = NULL; 1708 mm->m_data += max_linkhdr; 1709 mm->m_len = sizeof(struct ip6_hdr); 1710 1711 if ((mm->m_next = m_copy(m, 0, M_COPYALL)) == NULL) { 1712 m_freem(mm); 1713 return (ENOBUFS); 1714 } 1715 i = MHLEN - M_LEADINGSPACE(mm); 1716 if (i > len) 1717 i = len; 1718 mm = m_pullup(mm, i); 1719 if (mm == NULL) 1720 return (ENOBUFS); 1721/* TODO: check it! */ 1722 mm->m_pkthdr.len = len + sizeof(struct ip6_hdr); 1723 1724 /* 1725 * Send message to routing daemon 1726 */ 1727 sin6.sin6_addr = ip6->ip6_src; 1728 1729 im6 = mtod(mm, struct mrt6msg *); 1730 im6->im6_msgtype = MRT6MSG_WHOLEPKT; 1731 im6->im6_mbz = 0; 1732 1733 im6->im6_mif = mif - mif6table; 1734 1735 /* iif info is not given for reg. encap.n */ 1736 MRT6STAT_INC(mrt6s_upcalls); 1737 1738 if (socket_send(V_ip6_mrouter, mm, &sin6) < 0) { 1739#ifdef MRT6DEBUG 1740 if (V_mrt6debug) 1741 log(LOG_WARNING, 1742 "register_send: ip6_mrouter socket queue full\n"); 1743#endif 1744 MRT6STAT_INC(mrt6s_upq_sockfull); 1745 return (ENOBUFS); 1746 } 1747 return (0); 1748} 1749 1750/* 1751 * pim6_encapcheck() is called by the encap6_input() path at runtime to 1752 * determine if a packet is for PIM; allowing PIM to be dynamically loaded 1753 * into the kernel. 1754 */ 1755static int 1756pim6_encapcheck(const struct mbuf *m, int off, int proto, void *arg) 1757{ 1758 1759#ifdef DIAGNOSTIC 1760 KASSERT(proto == IPPROTO_PIM, ("not for IPPROTO_PIM")); 1761#endif 1762 if (proto != IPPROTO_PIM) 1763 return 0; /* not for us; reject the datagram. */ 1764 1765 return 64; /* claim the datagram. */ 1766} 1767 1768/* 1769 * PIM sparse mode hook 1770 * Receives the pim control messages, and passes them up to the listening 1771 * socket, using rip6_input. 1772 * The only message processed is the REGISTER pim message; the pim header 1773 * is stripped off, and the inner packet is passed to register_mforward. 1774 */ 1775int 1776pim6_input(struct mbuf **mp, int *offp, int proto) 1777{ 1778 struct pim *pim; /* pointer to a pim struct */ 1779 struct ip6_hdr *ip6; 1780 int pimlen; 1781 struct mbuf *m = *mp; 1782 int minlen; 1783 int off = *offp; 1784 1785 PIM6STAT_INC(pim6s_rcv_total); 1786 1787 ip6 = mtod(m, struct ip6_hdr *); 1788 pimlen = m->m_pkthdr.len - *offp; 1789 1790 /* 1791 * Validate lengths 1792 */ 1793 if (pimlen < PIM_MINLEN) { 1794 PIM6STAT_INC(pim6s_rcv_tooshort); 1795#ifdef MRT6DEBUG 1796 if (V_mrt6debug & DEBUG_PIM) 1797 log(LOG_DEBUG,"pim6_input: PIM packet too short\n"); 1798#endif 1799 m_freem(m); 1800 return (IPPROTO_DONE); 1801 } 1802 1803 /* 1804 * if the packet is at least as big as a REGISTER, go ahead 1805 * and grab the PIM REGISTER header size, to avoid another 1806 * possible m_pullup() later. 1807 * 1808 * PIM_MINLEN == pimhdr + u_int32 == 8 1809 * PIM6_REG_MINLEN == pimhdr + reghdr + eip6hdr == 4 + 4 + 40 1810 */ 1811 minlen = (pimlen >= PIM6_REG_MINLEN) ? PIM6_REG_MINLEN : PIM_MINLEN; 1812 1813 /* 1814 * Make sure that the IP6 and PIM headers in contiguous memory, and 1815 * possibly the PIM REGISTER header 1816 */ 1817#ifndef PULLDOWN_TEST 1818 IP6_EXTHDR_CHECK(m, off, minlen, IPPROTO_DONE); 1819 /* adjust pointer */ 1820 ip6 = mtod(m, struct ip6_hdr *); 1821 1822 /* adjust mbuf to point to the PIM header */ 1823 pim = (struct pim *)((caddr_t)ip6 + off); 1824#else 1825 IP6_EXTHDR_GET(pim, struct pim *, m, off, minlen); 1826 if (pim == NULL) { 1827 PIM6STAT_INC(pim6s_rcv_tooshort); 1828 return (IPPROTO_DONE); 1829 } 1830#endif 1831 1832#define PIM6_CHECKSUM 1833#ifdef PIM6_CHECKSUM 1834 { 1835 int cksumlen; 1836 1837 /* 1838 * Validate checksum. 1839 * If PIM REGISTER, exclude the data packet 1840 */ 1841 if (pim->pim_type == PIM_REGISTER) 1842 cksumlen = PIM_MINLEN; 1843 else 1844 cksumlen = pimlen; 1845 1846 if (in6_cksum(m, IPPROTO_PIM, off, cksumlen)) { 1847 PIM6STAT_INC(pim6s_rcv_badsum); 1848#ifdef MRT6DEBUG 1849 if (V_mrt6debug & DEBUG_PIM) 1850 log(LOG_DEBUG, 1851 "pim6_input: invalid checksum\n"); 1852#endif 1853 m_freem(m); 1854 return (IPPROTO_DONE); 1855 } 1856 } 1857#endif /* PIM_CHECKSUM */ 1858 1859 /* PIM version check */ 1860 if (pim->pim_ver != PIM_VERSION) { 1861 PIM6STAT_INC(pim6s_rcv_badversion); 1862#ifdef MRT6DEBUG 1863 log(LOG_ERR, 1864 "pim6_input: incorrect version %d, expecting %d\n", 1865 pim->pim_ver, PIM_VERSION); 1866#endif 1867 m_freem(m); 1868 return (IPPROTO_DONE); 1869 } 1870 1871 if (pim->pim_type == PIM_REGISTER) { 1872 /* 1873 * since this is a REGISTER, we'll make a copy of the register 1874 * headers ip6+pim+u_int32_t+encap_ip6, to be passed up to the 1875 * routing daemon. 1876 */ 1877 static struct sockaddr_in6 dst = { sizeof(dst), AF_INET6 }; 1878 1879 struct mbuf *mcp; 1880 struct ip6_hdr *eip6; 1881 u_int32_t *reghdr; 1882 int rc; 1883#ifdef MRT6DEBUG 1884 char ip6bufs[INET6_ADDRSTRLEN], ip6bufd[INET6_ADDRSTRLEN]; 1885#endif 1886 1887 PIM6STAT_INC(pim6s_rcv_registers); 1888 1889 if ((reg_mif_num >= nummifs) || (reg_mif_num == (mifi_t) -1)) { 1890#ifdef MRT6DEBUG 1891 if (V_mrt6debug & DEBUG_PIM) 1892 log(LOG_DEBUG, 1893 "pim6_input: register mif not set: %d\n", 1894 reg_mif_num); 1895#endif 1896 m_freem(m); 1897 return (IPPROTO_DONE); 1898 } 1899 1900 reghdr = (u_int32_t *)(pim + 1); 1901 1902 if ((ntohl(*reghdr) & PIM_NULL_REGISTER)) 1903 goto pim6_input_to_daemon; 1904 1905 /* 1906 * Validate length 1907 */ 1908 if (pimlen < PIM6_REG_MINLEN) { 1909 PIM6STAT_INC(pim6s_rcv_tooshort); 1910 PIM6STAT_INC(pim6s_rcv_badregisters); 1911#ifdef MRT6DEBUG 1912 log(LOG_ERR, 1913 "pim6_input: register packet size too " 1914 "small %d from %s\n", 1915 pimlen, ip6_sprintf(ip6bufs, &ip6->ip6_src)); 1916#endif 1917 m_freem(m); 1918 return (IPPROTO_DONE); 1919 } 1920 1921 eip6 = (struct ip6_hdr *) (reghdr + 1); 1922#ifdef MRT6DEBUG 1923 if (V_mrt6debug & DEBUG_PIM) 1924 log(LOG_DEBUG, 1925 "pim6_input[register], eip6: %s -> %s, " 1926 "eip6 plen %d\n", 1927 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1928 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1929 ntohs(eip6->ip6_plen)); 1930#endif 1931 1932 /* verify the version number of the inner packet */ 1933 if ((eip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { 1934 PIM6STAT_INC(pim6s_rcv_badregisters); 1935#ifdef MRT6DEBUG 1936 log(LOG_DEBUG, "pim6_input: invalid IP version (%d) " 1937 "of the inner packet\n", 1938 (eip6->ip6_vfc & IPV6_VERSION)); 1939#endif 1940 m_freem(m); 1941 return (IPPROTO_NONE); 1942 } 1943 1944 /* verify the inner packet is destined to a mcast group */ 1945 if (!IN6_IS_ADDR_MULTICAST(&eip6->ip6_dst)) { 1946 PIM6STAT_INC(pim6s_rcv_badregisters); 1947#ifdef MRT6DEBUG 1948 if (V_mrt6debug & DEBUG_PIM) 1949 log(LOG_DEBUG, 1950 "pim6_input: inner packet of register " 1951 "is not multicast %s\n", 1952 ip6_sprintf(ip6bufd, &eip6->ip6_dst)); 1953#endif 1954 m_freem(m); 1955 return (IPPROTO_DONE); 1956 } 1957 1958 /* 1959 * make a copy of the whole header to pass to the daemon later. 1960 */ 1961 mcp = m_copy(m, 0, off + PIM6_REG_MINLEN); 1962 if (mcp == NULL) { 1963#ifdef MRT6DEBUG 1964 log(LOG_ERR, 1965 "pim6_input: pim register: " 1966 "could not copy register head\n"); 1967#endif 1968 m_freem(m); 1969 return (IPPROTO_DONE); 1970 } 1971 1972 /* 1973 * forward the inner ip6 packet; point m_data at the inner ip6. 1974 */ 1975 m_adj(m, off + PIM_MINLEN); 1976#ifdef MRT6DEBUG 1977 if (V_mrt6debug & DEBUG_PIM) { 1978 log(LOG_DEBUG, 1979 "pim6_input: forwarding decapsulated register: " 1980 "src %s, dst %s, mif %d\n", 1981 ip6_sprintf(ip6bufs, &eip6->ip6_src), 1982 ip6_sprintf(ip6bufd, &eip6->ip6_dst), 1983 reg_mif_num); 1984 } 1985#endif 1986 1987 rc = if_simloop(mif6table[reg_mif_num].m6_ifp, m, 1988 dst.sin6_family, 0); 1989 1990 /* prepare the register head to send to the mrouting daemon */ 1991 m = mcp; 1992 } 1993 1994 /* 1995 * Pass the PIM message up to the daemon; if it is a register message 1996 * pass the 'head' only up to the daemon. This includes the 1997 * encapsulator ip6 header, pim header, register header and the 1998 * encapsulated ip6 header. 1999 */ 2000 pim6_input_to_daemon: 2001 rip6_input(&m, offp, proto); 2002 return (IPPROTO_DONE); 2003} 2004 2005static int 2006ip6_mroute_modevent(module_t mod, int type, void *unused) 2007{ 2008 2009 switch (type) { 2010 case MOD_LOAD: 2011 MROUTER6_LOCK_INIT(); 2012 MFC6_LOCK_INIT(); 2013 MIF6_LOCK_INIT(); 2014 2015 pim6_encap_cookie = encap_attach_func(AF_INET6, IPPROTO_PIM, 2016 pim6_encapcheck, 2017 (const struct protosw *)&in6_pim_protosw, NULL); 2018 if (pim6_encap_cookie == NULL) { 2019 printf("ip6_mroute: unable to attach pim6 encap\n"); 2020 MIF6_LOCK_DESTROY(); 2021 MFC6_LOCK_DESTROY(); 2022 MROUTER6_LOCK_DESTROY(); 2023 return (EINVAL); 2024 } 2025 2026 ip6_mforward = X_ip6_mforward; 2027 ip6_mrouter_done = X_ip6_mrouter_done; 2028 ip6_mrouter_get = X_ip6_mrouter_get; 2029 ip6_mrouter_set = X_ip6_mrouter_set; 2030 mrt6_ioctl = X_mrt6_ioctl; 2031 break; 2032 2033 case MOD_UNLOAD: 2034 if (V_ip6_mrouter != NULL) 2035 return EINVAL; 2036 2037 if (pim6_encap_cookie) { 2038 encap_detach(pim6_encap_cookie); 2039 pim6_encap_cookie = NULL; 2040 } 2041 X_ip6_mrouter_done(); 2042 ip6_mforward = NULL; 2043 ip6_mrouter_done = NULL; 2044 ip6_mrouter_get = NULL; 2045 ip6_mrouter_set = NULL; 2046 mrt6_ioctl = NULL; 2047 2048 MIF6_LOCK_DESTROY(); 2049 MFC6_LOCK_DESTROY(); 2050 MROUTER6_LOCK_DESTROY(); 2051 break; 2052 2053 default: 2054 return (EOPNOTSUPP); 2055 } 2056 2057 return (0); 2058} 2059 2060static moduledata_t ip6_mroutemod = { 2061 "ip6_mroute", 2062 ip6_mroute_modevent, 2063 0 2064}; 2065 2066DECLARE_MODULE(ip6_mroute, ip6_mroutemod, SI_SUB_PSEUDO, SI_ORDER_ANY); 2067