1/*
   2 *	Multicast support for IPv6
   3 *	Linux INET6 implementation
   4 *
   5 *	Authors:
   6 *	Pedro Roque		<roque@di.fc.ul.pt>
   7 *
   8 *	Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
   9 *
  10 *	This program is free software; you can redistribute it and/or
  11 *      modify it under the terms of the GNU General Public License
  12 *      as published by the Free Software Foundation; either version
  13 *      2 of the License, or (at your option) any later version.
  14 */
  15
  16/* Changes:
  17 *
  18 *	yoshfuji	: fix format of router-alert option
  19 *	YOSHIFUJI Hideaki @USAGI:
  20 *		Fixed source address for MLD message based on
  21 *		<draft-ietf-magma-mld-source-05.txt>.
  22 *	YOSHIFUJI Hideaki @USAGI:
  23 *		- Ignore Queries for invalid addresses.
  24 *		- MLD for link-local addresses.
  25 *	David L Stevens <dlstevens@us.ibm.com>:
  26 *		- MLDv2 support
  27 */
  28
  29#include <linux/module.h>
  30#include <linux/errno.h>
  31#include <linux/types.h>
  32#include <linux/string.h>
  33#include <linux/socket.h>
  34#include <linux/sockios.h>
  35#include <linux/jiffies.h>
  36#include <linux/times.h>
  37#include <linux/net.h>
  38#include <linux/in.h>
  39#include <linux/in6.h>
  40#include <linux/netdevice.h>
  41#include <linux/if_arp.h>
  42#include <linux/route.h>
  43#include <linux/init.h>
  44#include <linux/proc_fs.h>
  45#include <linux/seq_file.h>
  46#include <linux/slab.h>
 
  47#include <net/mld.h>
  48
  49#include <linux/netfilter.h>
  50#include <linux/netfilter_ipv6.h>
  51
  52#include <net/net_namespace.h>
  53#include <net/sock.h>
  54#include <net/snmp.h>
  55
  56#include <net/ipv6.h>
  57#include <net/protocol.h>
  58#include <net/if_inet6.h>
  59#include <net/ndisc.h>
  60#include <net/addrconf.h>
  61#include <net/ip6_route.h>
  62#include <net/inet_common.h>
  63
  64#include <net/ip6_checksum.h>
  65
  66/* Set to 3 to get tracing... */
  67#define MCAST_DEBUG 2
  68
  69#if MCAST_DEBUG >= 3
  70#define MDBG(x) printk x
  71#else
  72#define MDBG(x)
  73#endif
  74
  75/* Ensure that we have struct in6_addr aligned on 32bit word. */
  76static void *__mld2_query_bugs[] __attribute__((__unused__)) = {
  77	BUILD_BUG_ON_NULL(offsetof(struct mld2_query, mld2q_srcs) % 4),
  78	BUILD_BUG_ON_NULL(offsetof(struct mld2_report, mld2r_grec) % 4),
  79	BUILD_BUG_ON_NULL(offsetof(struct mld2_grec, grec_mca) % 4)
  80};
  81
  82static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  83
  84/* Big mc list lock for all the sockets */
  85static DEFINE_SPINLOCK(ipv6_sk_mc_lock);
  86
  87static void igmp6_join_group(struct ifmcaddr6 *ma);
  88static void igmp6_leave_group(struct ifmcaddr6 *ma);
  89static void igmp6_timer_handler(unsigned long data);
  90
  91static void mld_gq_timer_expire(unsigned long data);
  92static void mld_ifc_timer_expire(unsigned long data);
  93static void mld_ifc_event(struct inet6_dev *idev);
  94static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  95static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *addr);
  96static void mld_clear_delrec(struct inet6_dev *idev);
 
  97static int sf_setstate(struct ifmcaddr6 *pmc);
  98static void sf_markstate(struct ifmcaddr6 *pmc);
  99static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
 100static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 101			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
 102			  int delta);
 103static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
 104			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
 105			  int delta);
 106static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
 107			    struct inet6_dev *idev);
 108
 109
 110#define IGMP6_UNSOLICITED_IVAL	(10*HZ)
 111#define MLD_QRV_DEFAULT		2
 112
 113#define MLD_V1_SEEN(idev) (dev_net((idev)->dev)->ipv6.devconf_all->force_mld_version == 1 || \
 114		(idev)->cnf.force_mld_version == 1 || \
 115		((idev)->mc_v1_seen && \
 116		time_before(jiffies, (idev)->mc_v1_seen)))
 
 
 
 117
 118#define IPV6_MLD_MAX_MSF	64
 119
 120int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 121
 122/*
 123 *	socket join on multicast group
 124 */
 125
 126#define for_each_pmc_rcu(np, pmc)				\
 127	for (pmc = rcu_dereference(np->ipv6_mc_list);		\
 128	     pmc != NULL;					\
 129	     pmc = rcu_dereference(pmc->next))
 130
 
 
 
 
 
 
 
 
 
 
 
 
 131int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 132{
 133	struct net_device *dev = NULL;
 134	struct ipv6_mc_socklist *mc_lst;
 135	struct ipv6_pinfo *np = inet6_sk(sk);
 136	struct net *net = sock_net(sk);
 137	int err;
 138
 139	if (!ipv6_addr_is_multicast(addr))
 140		return -EINVAL;
 141
 142	rcu_read_lock();
 143	for_each_pmc_rcu(np, mc_lst) {
 144		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 145		    ipv6_addr_equal(&mc_lst->addr, addr)) {
 146			rcu_read_unlock();
 147			return -EADDRINUSE;
 148		}
 149	}
 150	rcu_read_unlock();
 151
 152	mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 153
 154	if (mc_lst == NULL)
 155		return -ENOMEM;
 156
 157	mc_lst->next = NULL;
 158	ipv6_addr_copy(&mc_lst->addr, addr);
 159
 160	rcu_read_lock();
 161	if (ifindex == 0) {
 162		struct rt6_info *rt;
 163		rt = rt6_lookup(net, addr, NULL, 0, 0);
 164		if (rt) {
 165			dev = rt->rt6i_dev;
 166			dst_release(&rt->dst);
 167		}
 168	} else
 169		dev = dev_get_by_index_rcu(net, ifindex);
 170
 171	if (dev == NULL) {
 172		rcu_read_unlock();
 173		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 174		return -ENODEV;
 175	}
 176
 177	mc_lst->ifindex = dev->ifindex;
 178	mc_lst->sfmode = MCAST_EXCLUDE;
 179	rwlock_init(&mc_lst->sflock);
 180	mc_lst->sflist = NULL;
 181
 182	/*
 183	 *	now add/increase the group membership on the device
 184	 */
 185
 186	err = ipv6_dev_mc_inc(dev, addr);
 187
 188	if (err) {
 189		rcu_read_unlock();
 190		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 191		return err;
 192	}
 193
 194	spin_lock(&ipv6_sk_mc_lock);
 195	mc_lst->next = np->ipv6_mc_list;
 196	rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 197	spin_unlock(&ipv6_sk_mc_lock);
 198
 199	rcu_read_unlock();
 200
 201	return 0;
 202}
 203
 204/*
 205 *	socket leave on multicast group
 206 */
 207int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 208{
 209	struct ipv6_pinfo *np = inet6_sk(sk);
 210	struct ipv6_mc_socklist *mc_lst;
 211	struct ipv6_mc_socklist __rcu **lnk;
 212	struct net *net = sock_net(sk);
 213
 
 
 
 214	spin_lock(&ipv6_sk_mc_lock);
 215	for (lnk = &np->ipv6_mc_list;
 216	     (mc_lst = rcu_dereference_protected(*lnk,
 217			lockdep_is_held(&ipv6_sk_mc_lock))) !=NULL ;
 218	      lnk = &mc_lst->next) {
 219		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 220		    ipv6_addr_equal(&mc_lst->addr, addr)) {
 221			struct net_device *dev;
 222
 223			*lnk = mc_lst->next;
 224			spin_unlock(&ipv6_sk_mc_lock);
 225
 226			rcu_read_lock();
 227			dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 228			if (dev != NULL) {
 229				struct inet6_dev *idev = __in6_dev_get(dev);
 230
 231				(void) ip6_mc_leave_src(sk, mc_lst, idev);
 232				if (idev)
 233					__ipv6_dev_mc_dec(idev, &mc_lst->addr);
 234			} else
 235				(void) ip6_mc_leave_src(sk, mc_lst, NULL);
 236			rcu_read_unlock();
 237			atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 238			kfree_rcu(mc_lst, rcu);
 239			return 0;
 240		}
 241	}
 242	spin_unlock(&ipv6_sk_mc_lock);
 243
 244	return -EADDRNOTAVAIL;
 245}
 246
 247/* called with rcu_read_lock() */
 248static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 249					     const struct in6_addr *group,
 250					     int ifindex)
 251{
 252	struct net_device *dev = NULL;
 253	struct inet6_dev *idev = NULL;
 254
 255	if (ifindex == 0) {
 256		struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, 0);
 257
 258		if (rt) {
 259			dev = rt->rt6i_dev;
 260			dev_hold(dev);
 261			dst_release(&rt->dst);
 262		}
 263	} else
 264		dev = dev_get_by_index_rcu(net, ifindex);
 265
 266	if (!dev)
 267		return NULL;
 268	idev = __in6_dev_get(dev);
 269	if (!idev)
 270		return NULL;
 271	read_lock_bh(&idev->lock);
 272	if (idev->dead) {
 273		read_unlock_bh(&idev->lock);
 274		return NULL;
 275	}
 276	return idev;
 277}
 278
 279void ipv6_sock_mc_close(struct sock *sk)
 280{
 281	struct ipv6_pinfo *np = inet6_sk(sk);
 282	struct ipv6_mc_socklist *mc_lst;
 283	struct net *net = sock_net(sk);
 284
 
 
 
 285	spin_lock(&ipv6_sk_mc_lock);
 286	while ((mc_lst = rcu_dereference_protected(np->ipv6_mc_list,
 287				lockdep_is_held(&ipv6_sk_mc_lock))) != NULL) {
 288		struct net_device *dev;
 289
 290		np->ipv6_mc_list = mc_lst->next;
 291		spin_unlock(&ipv6_sk_mc_lock);
 292
 293		rcu_read_lock();
 294		dev = dev_get_by_index_rcu(net, mc_lst->ifindex);
 295		if (dev) {
 296			struct inet6_dev *idev = __in6_dev_get(dev);
 297
 298			(void) ip6_mc_leave_src(sk, mc_lst, idev);
 299			if (idev)
 300				__ipv6_dev_mc_dec(idev, &mc_lst->addr);
 301		} else
 302			(void) ip6_mc_leave_src(sk, mc_lst, NULL);
 303		rcu_read_unlock();
 304
 305		atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 306		kfree_rcu(mc_lst, rcu);
 307
 308		spin_lock(&ipv6_sk_mc_lock);
 309	}
 310	spin_unlock(&ipv6_sk_mc_lock);
 311}
 312
 313int ip6_mc_source(int add, int omode, struct sock *sk,
 314	struct group_source_req *pgsr)
 315{
 316	struct in6_addr *source, *group;
 317	struct ipv6_mc_socklist *pmc;
 318	struct inet6_dev *idev;
 319	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 320	struct ip6_sf_socklist *psl;
 321	struct net *net = sock_net(sk);
 322	int i, j, rv;
 323	int leavegroup = 0;
 324	int pmclocked = 0;
 325	int err;
 326
 327	source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 328	group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 329
 330	if (!ipv6_addr_is_multicast(group))
 331		return -EINVAL;
 332
 333	rcu_read_lock();
 334	idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 335	if (!idev) {
 336		rcu_read_unlock();
 337		return -ENODEV;
 338	}
 339
 340	err = -EADDRNOTAVAIL;
 341
 342	for_each_pmc_rcu(inet6, pmc) {
 343		if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 344			continue;
 345		if (ipv6_addr_equal(&pmc->addr, group))
 346			break;
 347	}
 348	if (!pmc) {		/* must have a prior join */
 349		err = -EINVAL;
 350		goto done;
 351	}
 352	/* if a source filter was set, must be the same mode as before */
 353	if (pmc->sflist) {
 354		if (pmc->sfmode != omode) {
 355			err = -EINVAL;
 356			goto done;
 357		}
 358	} else if (pmc->sfmode != omode) {
 359		/* allow mode switches for empty-set filters */
 360		ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 361		ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 362		pmc->sfmode = omode;
 363	}
 364
 365	write_lock(&pmc->sflock);
 366	pmclocked = 1;
 367
 368	psl = pmc->sflist;
 369	if (!add) {
 370		if (!psl)
 371			goto done;	/* err = -EADDRNOTAVAIL */
 372		rv = !0;
 373		for (i=0; i<psl->sl_count; i++) {
 374			rv = memcmp(&psl->sl_addr[i], source,
 375				sizeof(struct in6_addr));
 376			if (rv == 0)
 377				break;
 378		}
 379		if (rv)		/* source not found */
 380			goto done;	/* err = -EADDRNOTAVAIL */
 381
 382		/* special case - (INCLUDE, empty) == LEAVE_GROUP */
 383		if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 384			leavegroup = 1;
 385			goto done;
 386		}
 387
 388		/* update the interface filter */
 389		ip6_mc_del_src(idev, group, omode, 1, source, 1);
 390
 391		for (j=i+1; j<psl->sl_count; j++)
 392			psl->sl_addr[j-1] = psl->sl_addr[j];
 393		psl->sl_count--;
 394		err = 0;
 395		goto done;
 396	}
 397	/* else, add a new source to the filter */
 398
 399	if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 400		err = -ENOBUFS;
 401		goto done;
 402	}
 403	if (!psl || psl->sl_count == psl->sl_max) {
 404		struct ip6_sf_socklist *newpsl;
 405		int count = IP6_SFBLOCK;
 406
 407		if (psl)
 408			count += psl->sl_max;
 409		newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 410		if (!newpsl) {
 411			err = -ENOBUFS;
 412			goto done;
 413		}
 414		newpsl->sl_max = count;
 415		newpsl->sl_count = count - IP6_SFBLOCK;
 416		if (psl) {
 417			for (i=0; i<psl->sl_count; i++)
 418				newpsl->sl_addr[i] = psl->sl_addr[i];
 419			sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 420		}
 421		pmc->sflist = psl = newpsl;
 422	}
 423	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
 424	for (i=0; i<psl->sl_count; i++) {
 425		rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr));
 426		if (rv == 0)
 427			break;
 428	}
 429	if (rv == 0)		/* address already there is an error */
 430		goto done;
 431	for (j=psl->sl_count-1; j>=i; j--)
 432		psl->sl_addr[j+1] = psl->sl_addr[j];
 433	psl->sl_addr[i] = *source;
 434	psl->sl_count++;
 435	err = 0;
 436	/* update the interface list */
 437	ip6_mc_add_src(idev, group, omode, 1, source, 1);
 438done:
 439	if (pmclocked)
 440		write_unlock(&pmc->sflock);
 441	read_unlock_bh(&idev->lock);
 442	rcu_read_unlock();
 443	if (leavegroup)
 444		return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 445	return err;
 446}
 447
 448int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 449{
 450	const struct in6_addr *group;
 451	struct ipv6_mc_socklist *pmc;
 452	struct inet6_dev *idev;
 453	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 454	struct ip6_sf_socklist *newpsl, *psl;
 455	struct net *net = sock_net(sk);
 456	int leavegroup = 0;
 457	int i, err;
 458
 459	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 460
 461	if (!ipv6_addr_is_multicast(group))
 462		return -EINVAL;
 463	if (gsf->gf_fmode != MCAST_INCLUDE &&
 464	    gsf->gf_fmode != MCAST_EXCLUDE)
 465		return -EINVAL;
 466
 467	rcu_read_lock();
 468	idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 469
 470	if (!idev) {
 471		rcu_read_unlock();
 472		return -ENODEV;
 473	}
 474
 475	err = 0;
 476
 477	if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 478		leavegroup = 1;
 479		goto done;
 480	}
 481
 482	for_each_pmc_rcu(inet6, pmc) {
 483		if (pmc->ifindex != gsf->gf_interface)
 484			continue;
 485		if (ipv6_addr_equal(&pmc->addr, group))
 486			break;
 487	}
 488	if (!pmc) {		/* must have a prior join */
 489		err = -EINVAL;
 490		goto done;
 491	}
 492	if (gsf->gf_numsrc) {
 493		newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 494							  GFP_ATOMIC);
 495		if (!newpsl) {
 496			err = -ENOBUFS;
 497			goto done;
 498		}
 499		newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 500		for (i=0; i<newpsl->sl_count; ++i) {
 501			struct sockaddr_in6 *psin6;
 502
 503			psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 504			newpsl->sl_addr[i] = psin6->sin6_addr;
 505		}
 506		err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 507			newpsl->sl_count, newpsl->sl_addr, 0);
 508		if (err) {
 509			sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 510			goto done;
 511		}
 512	} else {
 513		newpsl = NULL;
 514		(void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 515	}
 516
 517	write_lock(&pmc->sflock);
 518	psl = pmc->sflist;
 519	if (psl) {
 520		(void) ip6_mc_del_src(idev, group, pmc->sfmode,
 521			psl->sl_count, psl->sl_addr, 0);
 522		sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 523	} else
 524		(void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 525	pmc->sflist = newpsl;
 526	pmc->sfmode = gsf->gf_fmode;
 527	write_unlock(&pmc->sflock);
 528	err = 0;
 529done:
 530	read_unlock_bh(&idev->lock);
 531	rcu_read_unlock();
 532	if (leavegroup)
 533		err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 534	return err;
 535}
 536
 537int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 538	struct group_filter __user *optval, int __user *optlen)
 539{
 540	int err, i, count, copycount;
 541	const struct in6_addr *group;
 542	struct ipv6_mc_socklist *pmc;
 543	struct inet6_dev *idev;
 544	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 545	struct ip6_sf_socklist *psl;
 546	struct net *net = sock_net(sk);
 547
 548	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 549
 550	if (!ipv6_addr_is_multicast(group))
 551		return -EINVAL;
 552
 553	rcu_read_lock();
 554	idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 555
 556	if (!idev) {
 557		rcu_read_unlock();
 558		return -ENODEV;
 559	}
 560
 561	err = -EADDRNOTAVAIL;
 562	/*
 563	 * changes to the ipv6_mc_list require the socket lock and
 564	 * a read lock on ip6_sk_mc_lock. We have the socket lock,
 565	 * so reading the list is safe.
 566	 */
 567
 568	for_each_pmc_rcu(inet6, pmc) {
 569		if (pmc->ifindex != gsf->gf_interface)
 570			continue;
 571		if (ipv6_addr_equal(group, &pmc->addr))
 572			break;
 573	}
 574	if (!pmc)		/* must have a prior join */
 575		goto done;
 576	gsf->gf_fmode = pmc->sfmode;
 577	psl = pmc->sflist;
 578	count = psl ? psl->sl_count : 0;
 579	read_unlock_bh(&idev->lock);
 580	rcu_read_unlock();
 581
 582	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 583	gsf->gf_numsrc = count;
 584	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 585	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 586		return -EFAULT;
 587	}
 588	/* changes to psl require the socket lock, a read lock on
 589	 * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
 590	 * have the socket lock, so reading here is safe.
 591	 */
 592	for (i=0; i<copycount; i++) {
 593		struct sockaddr_in6 *psin6;
 594		struct sockaddr_storage ss;
 595
 596		psin6 = (struct sockaddr_in6 *)&ss;
 597		memset(&ss, 0, sizeof(ss));
 598		psin6->sin6_family = AF_INET6;
 599		psin6->sin6_addr = psl->sl_addr[i];
 600		if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 601			return -EFAULT;
 602	}
 603	return 0;
 604done:
 605	read_unlock_bh(&idev->lock);
 606	rcu_read_unlock();
 607	return err;
 608}
 609
 610int inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 611		   const struct in6_addr *src_addr)
 612{
 613	struct ipv6_pinfo *np = inet6_sk(sk);
 614	struct ipv6_mc_socklist *mc;
 615	struct ip6_sf_socklist *psl;
 616	int rv = 1;
 617
 618	rcu_read_lock();
 619	for_each_pmc_rcu(np, mc) {
 620		if (ipv6_addr_equal(&mc->addr, mc_addr))
 621			break;
 622	}
 623	if (!mc) {
 624		rcu_read_unlock();
 625		return 1;
 626	}
 627	read_lock(&mc->sflock);
 628	psl = mc->sflist;
 629	if (!psl) {
 630		rv = mc->sfmode == MCAST_EXCLUDE;
 631	} else {
 632		int i;
 633
 634		for (i=0; i<psl->sl_count; i++) {
 635			if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 636				break;
 637		}
 638		if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 639			rv = 0;
 640		if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 641			rv = 0;
 642	}
 643	read_unlock(&mc->sflock);
 644	rcu_read_unlock();
 645
 646	return rv;
 647}
 648
 649static void ma_put(struct ifmcaddr6 *mc)
 650{
 651	if (atomic_dec_and_test(&mc->mca_refcnt)) {
 652		in6_dev_put(mc->idev);
 653		kfree(mc);
 654	}
 655}
 656
 657static void igmp6_group_added(struct ifmcaddr6 *mc)
 658{
 659	struct net_device *dev = mc->idev->dev;
 660	char buf[MAX_ADDR_LEN];
 661
 
 
 
 
 662	spin_lock_bh(&mc->mca_lock);
 663	if (!(mc->mca_flags&MAF_LOADED)) {
 664		mc->mca_flags |= MAF_LOADED;
 665		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 666			dev_mc_add(dev, buf);
 667	}
 668	spin_unlock_bh(&mc->mca_lock);
 669
 670	if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 671		return;
 672
 673	if (MLD_V1_SEEN(mc->idev)) {
 674		igmp6_join_group(mc);
 675		return;
 676	}
 677	/* else v2 */
 678
 679	mc->mca_crcount = mc->idev->mc_qrv;
 680	mld_ifc_event(mc->idev);
 681}
 682
 683static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 684{
 685	struct net_device *dev = mc->idev->dev;
 686	char buf[MAX_ADDR_LEN];
 687
 
 
 
 
 688	spin_lock_bh(&mc->mca_lock);
 689	if (mc->mca_flags&MAF_LOADED) {
 690		mc->mca_flags &= ~MAF_LOADED;
 691		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 692			dev_mc_del(dev, buf);
 693	}
 694
 695	if (mc->mca_flags & MAF_NOREPORT)
 696		goto done;
 697	spin_unlock_bh(&mc->mca_lock);
 698
 699	if (!mc->idev->dead)
 700		igmp6_leave_group(mc);
 701
 702	spin_lock_bh(&mc->mca_lock);
 703	if (del_timer(&mc->mca_timer))
 704		atomic_dec(&mc->mca_refcnt);
 705done:
 706	ip6_mc_clear_src(mc);
 707	spin_unlock_bh(&mc->mca_lock);
 708}
 709
 710/*
 711 * deleted ifmcaddr6 manipulation
 712 */
 713static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 714{
 715	struct ifmcaddr6 *pmc;
 716
 717	/* this is an "ifmcaddr6" for convenience; only the fields below
 718	 * are actually used. In particular, the refcnt and users are not
 719	 * used for management of the delete list. Using the same structure
 720	 * for deleted items allows change reports to use common code with
 721	 * non-deleted or query-response MCA's.
 722	 */
 723	pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 724	if (!pmc)
 725		return;
 726
 727	spin_lock_bh(&im->mca_lock);
 728	spin_lock_init(&pmc->mca_lock);
 729	pmc->idev = im->idev;
 730	in6_dev_hold(idev);
 731	pmc->mca_addr = im->mca_addr;
 732	pmc->mca_crcount = idev->mc_qrv;
 733	pmc->mca_sfmode = im->mca_sfmode;
 734	if (pmc->mca_sfmode == MCAST_INCLUDE) {
 735		struct ip6_sf_list *psf;
 736
 737		pmc->mca_tomb = im->mca_tomb;
 738		pmc->mca_sources = im->mca_sources;
 739		im->mca_tomb = im->mca_sources = NULL;
 740		for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
 741			psf->sf_crcount = pmc->mca_crcount;
 742	}
 743	spin_unlock_bh(&im->mca_lock);
 744
 745	spin_lock_bh(&idev->mc_lock);
 746	pmc->next = idev->mc_tomb;
 747	idev->mc_tomb = pmc;
 748	spin_unlock_bh(&idev->mc_lock);
 749}
 750
 751static void mld_del_delrec(struct inet6_dev *idev, const struct in6_addr *pmca)
 752{
 753	struct ifmcaddr6 *pmc, *pmc_prev;
 754	struct ip6_sf_list *psf, *psf_next;
 755
 756	spin_lock_bh(&idev->mc_lock);
 757	pmc_prev = NULL;
 758	for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) {
 759		if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 760			break;
 761		pmc_prev = pmc;
 762	}
 763	if (pmc) {
 764		if (pmc_prev)
 765			pmc_prev->next = pmc->next;
 766		else
 767			idev->mc_tomb = pmc->next;
 768	}
 769	spin_unlock_bh(&idev->mc_lock);
 770
 771	if (pmc) {
 772		for (psf=pmc->mca_tomb; psf; psf=psf_next) {
 773			psf_next = psf->sf_next;
 774			kfree(psf);
 775		}
 776		in6_dev_put(pmc->idev);
 777		kfree(pmc);
 778	}
 779}
 780
 781static void mld_clear_delrec(struct inet6_dev *idev)
 782{
 783	struct ifmcaddr6 *pmc, *nextpmc;
 784
 785	spin_lock_bh(&idev->mc_lock);
 786	pmc = idev->mc_tomb;
 787	idev->mc_tomb = NULL;
 788	spin_unlock_bh(&idev->mc_lock);
 789
 790	for (; pmc; pmc = nextpmc) {
 791		nextpmc = pmc->next;
 792		ip6_mc_clear_src(pmc);
 793		in6_dev_put(pmc->idev);
 794		kfree(pmc);
 795	}
 796
 797	/* clear dead sources, too */
 798	read_lock_bh(&idev->lock);
 799	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
 800		struct ip6_sf_list *psf, *psf_next;
 801
 802		spin_lock_bh(&pmc->mca_lock);
 803		psf = pmc->mca_tomb;
 804		pmc->mca_tomb = NULL;
 805		spin_unlock_bh(&pmc->mca_lock);
 806		for (; psf; psf=psf_next) {
 807			psf_next = psf->sf_next;
 808			kfree(psf);
 809		}
 810	}
 811	read_unlock_bh(&idev->lock);
 812}
 813
 814
 815/*
 816 *	device multicast group inc (add if not found)
 817 */
 818int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 819{
 820	struct ifmcaddr6 *mc;
 821	struct inet6_dev *idev;
 822
 823	/* we need to take a reference on idev */
 824	idev = in6_dev_get(dev);
 825
 826	if (idev == NULL)
 827		return -EINVAL;
 828
 829	write_lock_bh(&idev->lock);
 830	if (idev->dead) {
 831		write_unlock_bh(&idev->lock);
 832		in6_dev_put(idev);
 833		return -ENODEV;
 834	}
 835
 836	for (mc = idev->mc_list; mc; mc = mc->next) {
 837		if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 838			mc->mca_users++;
 839			write_unlock_bh(&idev->lock);
 840			ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 841				NULL, 0);
 842			in6_dev_put(idev);
 843			return 0;
 844		}
 845	}
 846
 847	/*
 848	 *	not found: create a new one.
 849	 */
 850
 851	mc = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC);
 852
 853	if (mc == NULL) {
 854		write_unlock_bh(&idev->lock);
 855		in6_dev_put(idev);
 856		return -ENOMEM;
 857	}
 858
 859	setup_timer(&mc->mca_timer, igmp6_timer_handler, (unsigned long)mc);
 860
 861	ipv6_addr_copy(&mc->mca_addr, addr);
 862	mc->idev = idev; /* (reference taken) */
 863	mc->mca_users = 1;
 864	/* mca_stamp should be updated upon changes */
 865	mc->mca_cstamp = mc->mca_tstamp = jiffies;
 866	atomic_set(&mc->mca_refcnt, 2);
 867	spin_lock_init(&mc->mca_lock);
 868
 869	/* initial mode is (EX, empty) */
 870	mc->mca_sfmode = MCAST_EXCLUDE;
 871	mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 872
 873	if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 874	    IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 875		mc->mca_flags |= MAF_NOREPORT;
 876
 877	mc->next = idev->mc_list;
 878	idev->mc_list = mc;
 879	write_unlock_bh(&idev->lock);
 880
 881	mld_del_delrec(idev, &mc->mca_addr);
 882	igmp6_group_added(mc);
 883	ma_put(mc);
 884	return 0;
 885}
 886
 887/*
 888 *	device multicast group del
 889 */
 890int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 891{
 892	struct ifmcaddr6 *ma, **map;
 893
 894	write_lock_bh(&idev->lock);
 895	for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) {
 896		if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 897			if (--ma->mca_users == 0) {
 898				*map = ma->next;
 899				write_unlock_bh(&idev->lock);
 900
 901				igmp6_group_dropped(ma);
 902
 903				ma_put(ma);
 904				return 0;
 905			}
 906			write_unlock_bh(&idev->lock);
 907			return 0;
 908		}
 909	}
 910	write_unlock_bh(&idev->lock);
 911
 912	return -ENOENT;
 913}
 914
 915int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 916{
 917	struct inet6_dev *idev;
 918	int err;
 919
 920	rcu_read_lock();
 921
 922	idev = __in6_dev_get(dev);
 923	if (!idev)
 924		err = -ENODEV;
 925	else
 926		err = __ipv6_dev_mc_dec(idev, addr);
 927
 928	rcu_read_unlock();
 929	return err;
 930}
 931
 932/*
 933 * identify MLD packets for MLD filter exceptions
 934 */
 935int ipv6_is_mld(struct sk_buff *skb, int nexthdr)
 936{
 937	struct icmp6hdr *pic;
 938
 939	if (nexthdr != IPPROTO_ICMPV6)
 940		return 0;
 941
 942	if (!pskb_may_pull(skb, sizeof(struct icmp6hdr)))
 943		return 0;
 944
 945	pic = icmp6_hdr(skb);
 946
 947	switch (pic->icmp6_type) {
 948	case ICMPV6_MGM_QUERY:
 949	case ICMPV6_MGM_REPORT:
 950	case ICMPV6_MGM_REDUCTION:
 951	case ICMPV6_MLD2_REPORT:
 952		return 1;
 953	default:
 954		break;
 955	}
 956	return 0;
 957}
 958
 959/*
 960 *	check if the interface/address pair is valid
 961 */
 962int ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 963			const struct in6_addr *src_addr)
 964{
 965	struct inet6_dev *idev;
 966	struct ifmcaddr6 *mc;
 967	int rv = 0;
 968
 969	rcu_read_lock();
 970	idev = __in6_dev_get(dev);
 971	if (idev) {
 972		read_lock_bh(&idev->lock);
 973		for (mc = idev->mc_list; mc; mc=mc->next) {
 974			if (ipv6_addr_equal(&mc->mca_addr, group))
 975				break;
 976		}
 977		if (mc) {
 978			if (src_addr && !ipv6_addr_any(src_addr)) {
 979				struct ip6_sf_list *psf;
 980
 981				spin_lock_bh(&mc->mca_lock);
 982				for (psf=mc->mca_sources;psf;psf=psf->sf_next) {
 983					if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 984						break;
 985				}
 986				if (psf)
 987					rv = psf->sf_count[MCAST_INCLUDE] ||
 988						psf->sf_count[MCAST_EXCLUDE] !=
 989						mc->mca_sfcount[MCAST_EXCLUDE];
 990				else
 991					rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0;
 992				spin_unlock_bh(&mc->mca_lock);
 993			} else
 994				rv = 1; /* don't filter unspecified source */
 995		}
 996		read_unlock_bh(&idev->lock);
 997	}
 998	rcu_read_unlock();
 999	return rv;
1000}
1001
1002static void mld_gq_start_timer(struct inet6_dev *idev)
1003{
1004	int tv = net_random() % idev->mc_maxdelay;
1005
1006	idev->mc_gq_running = 1;
1007	if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1008		in6_dev_hold(idev);
1009}
1010
1011static void mld_ifc_start_timer(struct inet6_dev *idev, int delay)
1012{
1013	int tv = net_random() % delay;
 
 
 
 
 
 
 
1014
1015	if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1016		in6_dev_hold(idev);
1017}
1018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1019/*
1020 *	IGMP handling (alias multicast ICMPv6 messages)
1021 */
1022
1023static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1024{
1025	unsigned long delay = resptime;
1026
1027	/* Do not start timer for these addresses */
1028	if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1029	    IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1030		return;
1031
1032	if (del_timer(&ma->mca_timer)) {
1033		atomic_dec(&ma->mca_refcnt);
1034		delay = ma->mca_timer.expires - jiffies;
1035	}
1036
1037	if (delay >= resptime) {
1038		if (resptime)
1039			delay = net_random() % resptime;
1040		else
1041			delay = 1;
1042	}
1043	ma->mca_timer.expires = jiffies + delay;
1044	if (!mod_timer(&ma->mca_timer, jiffies + delay))
1045		atomic_inc(&ma->mca_refcnt);
1046	ma->mca_flags |= MAF_TIMER_RUNNING;
1047}
1048
1049/* mark EXCLUDE-mode sources */
1050static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1051	const struct in6_addr *srcs)
1052{
1053	struct ip6_sf_list *psf;
1054	int i, scount;
1055
1056	scount = 0;
1057	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1058		if (scount == nsrcs)
1059			break;
1060		for (i=0; i<nsrcs; i++) {
1061			/* skip inactive filters */
1062			if (psf->sf_count[MCAST_INCLUDE] ||
1063			    pmc->mca_sfcount[MCAST_EXCLUDE] !=
1064			    psf->sf_count[MCAST_EXCLUDE])
1065				continue;
1066			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1067				scount++;
1068				break;
1069			}
1070		}
1071	}
1072	pmc->mca_flags &= ~MAF_GSQUERY;
1073	if (scount == nsrcs)	/* all sources excluded */
1074		return 0;
1075	return 1;
1076}
1077
1078static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1079	const struct in6_addr *srcs)
1080{
1081	struct ip6_sf_list *psf;
1082	int i, scount;
1083
1084	if (pmc->mca_sfmode == MCAST_EXCLUDE)
1085		return mld_xmarksources(pmc, nsrcs, srcs);
1086
1087	/* mark INCLUDE-mode sources */
1088
1089	scount = 0;
1090	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1091		if (scount == nsrcs)
1092			break;
1093		for (i=0; i<nsrcs; i++) {
1094			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1095				psf->sf_gsresp = 1;
1096				scount++;
1097				break;
1098			}
1099		}
1100	}
1101	if (!scount) {
1102		pmc->mca_flags &= ~MAF_GSQUERY;
1103		return 0;
1104	}
1105	pmc->mca_flags |= MAF_GSQUERY;
1106	return 1;
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1107}
1108
1109/* called with rcu_read_lock() */
1110int igmp6_event_query(struct sk_buff *skb)
1111{
1112	struct mld2_query *mlh2 = NULL;
1113	struct ifmcaddr6 *ma;
1114	const struct in6_addr *group;
1115	unsigned long max_delay;
1116	struct inet6_dev *idev;
1117	struct mld_msg *mld;
1118	int group_type;
1119	int mark = 0;
1120	int len;
1121
1122	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1123		return -EINVAL;
1124
1125	/* compute payload length excluding extension headers */
1126	len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1127	len -= skb_network_header_len(skb);
1128
1129	/* Drop queries with not link local source */
1130	if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL))
1131		return -EINVAL;
1132
1133	idev = __in6_dev_get(skb->dev);
1134
1135	if (idev == NULL)
1136		return 0;
1137
1138	mld = (struct mld_msg *)icmp6_hdr(skb);
1139	group = &mld->mld_mca;
1140	group_type = ipv6_addr_type(group);
1141
1142	if (group_type != IPV6_ADDR_ANY &&
1143	    !(group_type&IPV6_ADDR_MULTICAST))
1144		return -EINVAL;
1145
1146	if (len == 24) {
1147		int switchback;
1148		/* MLDv1 router present */
1149
1150		/* Translate milliseconds to jiffies */
1151		max_delay = (ntohs(mld->mld_maxdelay)*HZ)/1000;
1152
1153		switchback = (idev->mc_qrv + 1) * max_delay;
1154		idev->mc_v1_seen = jiffies + switchback;
1155
1156		/* cancel the interface change timer */
1157		idev->mc_ifc_count = 0;
1158		if (del_timer(&idev->mc_ifc_timer))
1159			__in6_dev_put(idev);
1160		/* clear deleted report items */
1161		mld_clear_delrec(idev);
1162	} else if (len >= 28) {
1163		int srcs_offset = sizeof(struct mld2_query) -
1164				  sizeof(struct icmp6hdr);
 
1165		if (!pskb_may_pull(skb, srcs_offset))
1166			return -EINVAL;
1167
1168		mlh2 = (struct mld2_query *)skb_transport_header(skb);
1169		max_delay = (MLDV2_MRC(ntohs(mlh2->mld2q_mrc))*HZ)/1000;
1170		if (!max_delay)
1171			max_delay = 1;
1172		idev->mc_maxdelay = max_delay;
1173		if (mlh2->mld2q_qrv)
1174			idev->mc_qrv = mlh2->mld2q_qrv;
1175		if (group_type == IPV6_ADDR_ANY) { /* general query */
1176			if (mlh2->mld2q_nsrcs)
1177				return -EINVAL; /* no sources allowed */
1178
1179			mld_gq_start_timer(idev);
1180			return 0;
1181		}
1182		/* mark sources to include, if group & source-specific */
1183		if (mlh2->mld2q_nsrcs != 0) {
1184			if (!pskb_may_pull(skb, srcs_offset +
1185			    ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1186				return -EINVAL;
1187
1188			mlh2 = (struct mld2_query *)skb_transport_header(skb);
1189			mark = 1;
1190		}
1191	} else
1192		return -EINVAL;
1193
1194	read_lock_bh(&idev->lock);
1195	if (group_type == IPV6_ADDR_ANY) {
1196		for (ma = idev->mc_list; ma; ma=ma->next) {
1197			spin_lock_bh(&ma->mca_lock);
1198			igmp6_group_queried(ma, max_delay);
1199			spin_unlock_bh(&ma->mca_lock);
1200		}
1201	} else {
1202		for (ma = idev->mc_list; ma; ma=ma->next) {
1203			if (!ipv6_addr_equal(group, &ma->mca_addr))
1204				continue;
1205			spin_lock_bh(&ma->mca_lock);
1206			if (ma->mca_flags & MAF_TIMER_RUNNING) {
1207				/* gsquery <- gsquery && mark */
1208				if (!mark)
1209					ma->mca_flags &= ~MAF_GSQUERY;
1210			} else {
1211				/* gsquery <- mark */
1212				if (mark)
1213					ma->mca_flags |= MAF_GSQUERY;
1214				else
1215					ma->mca_flags &= ~MAF_GSQUERY;
1216			}
1217			if (!(ma->mca_flags & MAF_GSQUERY) ||
1218			    mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1219				igmp6_group_queried(ma, max_delay);
1220			spin_unlock_bh(&ma->mca_lock);
1221			break;
1222		}
1223	}
1224	read_unlock_bh(&idev->lock);
1225
1226	return 0;
1227}
1228
1229/* called with rcu_read_lock() */
1230int igmp6_event_report(struct sk_buff *skb)
1231{
1232	struct ifmcaddr6 *ma;
1233	struct inet6_dev *idev;
1234	struct mld_msg *mld;
1235	int addr_type;
1236
1237	/* Our own report looped back. Ignore it. */
1238	if (skb->pkt_type == PACKET_LOOPBACK)
1239		return 0;
1240
1241	/* send our report if the MC router may not have heard this report */
1242	if (skb->pkt_type != PACKET_MULTICAST &&
1243	    skb->pkt_type != PACKET_BROADCAST)
1244		return 0;
1245
1246	if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1247		return -EINVAL;
1248
1249	mld = (struct mld_msg *)icmp6_hdr(skb);
1250
1251	/* Drop reports with not link local source */
1252	addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1253	if (addr_type != IPV6_ADDR_ANY &&
1254	    !(addr_type&IPV6_ADDR_LINKLOCAL))
1255		return -EINVAL;
1256
1257	idev = __in6_dev_get(skb->dev);
1258	if (idev == NULL)
1259		return -ENODEV;
1260
1261	/*
1262	 *	Cancel the timer for this group
1263	 */
1264
1265	read_lock_bh(&idev->lock);
1266	for (ma = idev->mc_list; ma; ma=ma->next) {
1267		if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1268			spin_lock(&ma->mca_lock);
1269			if (del_timer(&ma->mca_timer))
1270				atomic_dec(&ma->mca_refcnt);
1271			ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1272			spin_unlock(&ma->mca_lock);
1273			break;
1274		}
1275	}
1276	read_unlock_bh(&idev->lock);
1277	return 0;
1278}
1279
1280static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1281	int gdeleted, int sdeleted)
1282{
1283	switch (type) {
1284	case MLD2_MODE_IS_INCLUDE:
1285	case MLD2_MODE_IS_EXCLUDE:
1286		if (gdeleted || sdeleted)
1287			return 0;
1288		if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1289			if (pmc->mca_sfmode == MCAST_INCLUDE)
1290				return 1;
1291			/* don't include if this source is excluded
1292			 * in all filters
1293			 */
1294			if (psf->sf_count[MCAST_INCLUDE])
1295				return type == MLD2_MODE_IS_INCLUDE;
1296			return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1297				psf->sf_count[MCAST_EXCLUDE];
1298		}
1299		return 0;
1300	case MLD2_CHANGE_TO_INCLUDE:
1301		if (gdeleted || sdeleted)
1302			return 0;
1303		return psf->sf_count[MCAST_INCLUDE] != 0;
1304	case MLD2_CHANGE_TO_EXCLUDE:
1305		if (gdeleted || sdeleted)
1306			return 0;
1307		if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1308		    psf->sf_count[MCAST_INCLUDE])
1309			return 0;
1310		return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1311			psf->sf_count[MCAST_EXCLUDE];
1312	case MLD2_ALLOW_NEW_SOURCES:
1313		if (gdeleted || !psf->sf_crcount)
1314			return 0;
1315		return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1316	case MLD2_BLOCK_OLD_SOURCES:
1317		if (pmc->mca_sfmode == MCAST_INCLUDE)
1318			return gdeleted || (psf->sf_crcount && sdeleted);
1319		return psf->sf_crcount && !gdeleted && !sdeleted;
1320	}
1321	return 0;
1322}
1323
1324static int
1325mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1326{
1327	struct ip6_sf_list *psf;
1328	int scount = 0;
1329
1330	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1331		if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1332			continue;
1333		scount++;
1334	}
1335	return scount;
1336}
1337
1338static struct sk_buff *mld_newpack(struct net_device *dev, int size)
 
 
 
 
1339{
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1340	struct net *net = dev_net(dev);
1341	struct sock *sk = net->ipv6.igmp_sk;
1342	struct sk_buff *skb;
1343	struct mld2_report *pmr;
1344	struct in6_addr addr_buf;
1345	const struct in6_addr *saddr;
 
 
1346	int err;
1347	u8 ra[8] = { IPPROTO_ICMPV6, 0,
1348		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1349		     IPV6_TLV_PADN, 0 };
1350
1351	/* we assume size > sizeof(ra) here */
1352	size += LL_ALLOCATED_SPACE(dev);
1353	/* limit our allocations to order-0 page */
1354	size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1355	skb = sock_alloc_send_skb(sk, size, 1, &err);
1356
1357	if (!skb)
1358		return NULL;
1359
1360	skb_reserve(skb, LL_RESERVED_SPACE(dev));
 
1361
1362	if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1363		/* <draft-ietf-magma-mld-source-05.txt>:
1364		 * use unspecified address as the source address
1365		 * when a valid link-local address is not available.
1366		 */
1367		saddr = &in6addr_any;
1368	} else
1369		saddr = &addr_buf;
1370
1371	ip6_nd_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1372
1373	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1374
1375	skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1376	skb_put(skb, sizeof(*pmr));
1377	pmr = (struct mld2_report *)skb_transport_header(skb);
1378	pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1379	pmr->mld2r_resv1 = 0;
1380	pmr->mld2r_cksum = 0;
1381	pmr->mld2r_resv2 = 0;
1382	pmr->mld2r_ngrec = 0;
1383	return skb;
1384}
1385
1386static void mld_sendpack(struct sk_buff *skb)
1387{
1388	struct ipv6hdr *pip6 = ipv6_hdr(skb);
1389	struct mld2_report *pmr =
1390			      (struct mld2_report *)skb_transport_header(skb);
1391	int payload_len, mldlen;
1392	struct inet6_dev *idev;
1393	struct net *net = dev_net(skb->dev);
1394	int err;
1395	struct flowi6 fl6;
1396	struct dst_entry *dst;
1397
1398	rcu_read_lock();
1399	idev = __in6_dev_get(skb->dev);
1400	IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1401
1402	payload_len = (skb->tail - skb->network_header) - sizeof(*pip6);
1403	mldlen = skb->tail - skb->transport_header;
 
1404	pip6->payload_len = htons(payload_len);
1405
1406	pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1407					   IPPROTO_ICMPV6,
1408					   csum_partial(skb_transport_header(skb),
1409							mldlen, 0));
1410
1411	dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1412
1413	if (!dst) {
1414		err = -ENOMEM;
1415		goto err_out;
1416	}
1417
1418	icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1419			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1420			 skb->dev->ifindex);
 
1421
1422	dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1423	err = 0;
1424	if (IS_ERR(dst)) {
1425		err = PTR_ERR(dst);
1426		dst = NULL;
1427	}
1428	skb_dst_set(skb, dst);
1429	if (err)
1430		goto err_out;
1431
1432	payload_len = skb->len;
1433
1434	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1435		      dst_output);
1436out:
1437	if (!err) {
1438		ICMP6MSGOUT_INC_STATS_BH(net, idev, ICMPV6_MLD2_REPORT);
1439		ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_OUTMSGS);
1440		IP6_UPD_PO_STATS_BH(net, idev, IPSTATS_MIB_OUTMCAST, payload_len);
1441	} else
1442		IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_OUTDISCARDS);
 
1443
1444	rcu_read_unlock();
1445	return;
1446
1447err_out:
1448	kfree_skb(skb);
1449	goto out;
1450}
1451
1452static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1453{
1454	return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1455}
1456
1457static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1458	int type, struct mld2_grec **ppgr)
1459{
1460	struct net_device *dev = pmc->idev->dev;
1461	struct mld2_report *pmr;
1462	struct mld2_grec *pgr;
1463
1464	if (!skb)
1465		skb = mld_newpack(dev, dev->mtu);
1466	if (!skb)
1467		return NULL;
1468	pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec));
1469	pgr->grec_type = type;
1470	pgr->grec_auxwords = 0;
1471	pgr->grec_nsrcs = 0;
1472	pgr->grec_mca = pmc->mca_addr;	/* structure copy */
1473	pmr = (struct mld2_report *)skb_transport_header(skb);
1474	pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1475	*ppgr = pgr;
1476	return skb;
1477}
1478
1479#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
1480	skb_tailroom(skb)) : 0)
1481
1482static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1483	int type, int gdeleted, int sdeleted)
1484{
1485	struct net_device *dev = pmc->idev->dev;
 
1486	struct mld2_report *pmr;
1487	struct mld2_grec *pgr = NULL;
1488	struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1489	int scount, stotal, first, isquery, truncate;
1490
1491	if (pmc->mca_flags & MAF_NOREPORT)
1492		return skb;
1493
1494	isquery = type == MLD2_MODE_IS_INCLUDE ||
1495		  type == MLD2_MODE_IS_EXCLUDE;
1496	truncate = type == MLD2_MODE_IS_EXCLUDE ||
1497		    type == MLD2_CHANGE_TO_EXCLUDE;
1498
1499	stotal = scount = 0;
1500
1501	psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1502
1503	if (!*psf_list)
1504		goto empty_source;
1505
1506	pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1507
1508	/* EX and TO_EX get a fresh packet, if needed */
1509	if (truncate) {
1510		if (pmr && pmr->mld2r_ngrec &&
1511		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1512			if (skb)
1513				mld_sendpack(skb);
1514			skb = mld_newpack(dev, dev->mtu);
1515		}
1516	}
1517	first = 1;
1518	psf_prev = NULL;
1519	for (psf=*psf_list; psf; psf=psf_next) {
1520		struct in6_addr *psrc;
1521
1522		psf_next = psf->sf_next;
1523
1524		if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1525			psf_prev = psf;
1526			continue;
1527		}
1528
1529		/* clear marks on query responses */
1530		if (isquery)
1531			psf->sf_gsresp = 0;
1532
1533		if (AVAILABLE(skb) < sizeof(*psrc) +
1534		    first*sizeof(struct mld2_grec)) {
1535			if (truncate && !first)
1536				break;	 /* truncate these */
1537			if (pgr)
1538				pgr->grec_nsrcs = htons(scount);
1539			if (skb)
1540				mld_sendpack(skb);
1541			skb = mld_newpack(dev, dev->mtu);
1542			first = 1;
1543			scount = 0;
1544		}
1545		if (first) {
1546			skb = add_grhead(skb, pmc, type, &pgr);
1547			first = 0;
1548		}
1549		if (!skb)
1550			return NULL;
1551		psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
1552		*psrc = psf->sf_addr;
1553		scount++; stotal++;
1554		if ((type == MLD2_ALLOW_NEW_SOURCES ||
1555		     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1556			psf->sf_crcount--;
1557			if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1558				if (psf_prev)
1559					psf_prev->sf_next = psf->sf_next;
1560				else
1561					*psf_list = psf->sf_next;
1562				kfree(psf);
1563				continue;
1564			}
1565		}
1566		psf_prev = psf;
1567	}
1568
1569empty_source:
1570	if (!stotal) {
1571		if (type == MLD2_ALLOW_NEW_SOURCES ||
1572		    type == MLD2_BLOCK_OLD_SOURCES)
1573			return skb;
1574		if (pmc->mca_crcount || isquery) {
1575			/* make sure we have room for group header */
1576			if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1577				mld_sendpack(skb);
1578				skb = NULL; /* add_grhead will get a new one */
1579			}
1580			skb = add_grhead(skb, pmc, type, &pgr);
1581		}
1582	}
1583	if (pgr)
1584		pgr->grec_nsrcs = htons(scount);
1585
1586	if (isquery)
1587		pmc->mca_flags &= ~MAF_GSQUERY;	/* clear query state */
1588	return skb;
1589}
1590
1591static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1592{
1593	struct sk_buff *skb = NULL;
1594	int type;
1595
 
1596	if (!pmc) {
1597		read_lock_bh(&idev->lock);
1598		for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1599			if (pmc->mca_flags & MAF_NOREPORT)
1600				continue;
1601			spin_lock_bh(&pmc->mca_lock);
1602			if (pmc->mca_sfcount[MCAST_EXCLUDE])
1603				type = MLD2_MODE_IS_EXCLUDE;
1604			else
1605				type = MLD2_MODE_IS_INCLUDE;
1606			skb = add_grec(skb, pmc, type, 0, 0);
1607			spin_unlock_bh(&pmc->mca_lock);
1608		}
1609		read_unlock_bh(&idev->lock);
1610	} else {
1611		spin_lock_bh(&pmc->mca_lock);
1612		if (pmc->mca_sfcount[MCAST_EXCLUDE])
1613			type = MLD2_MODE_IS_EXCLUDE;
1614		else
1615			type = MLD2_MODE_IS_INCLUDE;
1616		skb = add_grec(skb, pmc, type, 0, 0);
1617		spin_unlock_bh(&pmc->mca_lock);
1618	}
 
1619	if (skb)
1620		mld_sendpack(skb);
1621}
1622
1623/*
1624 * remove zero-count source records from a source filter list
1625 */
1626static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1627{
1628	struct ip6_sf_list *psf_prev, *psf_next, *psf;
1629
1630	psf_prev = NULL;
1631	for (psf=*ppsf; psf; psf = psf_next) {
1632		psf_next = psf->sf_next;
1633		if (psf->sf_crcount == 0) {
1634			if (psf_prev)
1635				psf_prev->sf_next = psf->sf_next;
1636			else
1637				*ppsf = psf->sf_next;
1638			kfree(psf);
1639		} else
1640			psf_prev = psf;
1641	}
1642}
1643
1644static void mld_send_cr(struct inet6_dev *idev)
1645{
1646	struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1647	struct sk_buff *skb = NULL;
1648	int type, dtype;
1649
1650	read_lock_bh(&idev->lock);
1651	spin_lock(&idev->mc_lock);
1652
1653	/* deleted MCA's */
1654	pmc_prev = NULL;
1655	for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) {
1656		pmc_next = pmc->next;
1657		if (pmc->mca_sfmode == MCAST_INCLUDE) {
1658			type = MLD2_BLOCK_OLD_SOURCES;
1659			dtype = MLD2_BLOCK_OLD_SOURCES;
1660			skb = add_grec(skb, pmc, type, 1, 0);
1661			skb = add_grec(skb, pmc, dtype, 1, 1);
1662		}
1663		if (pmc->mca_crcount) {
1664			if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1665				type = MLD2_CHANGE_TO_INCLUDE;
1666				skb = add_grec(skb, pmc, type, 1, 0);
1667			}
1668			pmc->mca_crcount--;
1669			if (pmc->mca_crcount == 0) {
1670				mld_clear_zeros(&pmc->mca_tomb);
1671				mld_clear_zeros(&pmc->mca_sources);
1672			}
1673		}
1674		if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1675		    !pmc->mca_sources) {
1676			if (pmc_prev)
1677				pmc_prev->next = pmc_next;
1678			else
1679				idev->mc_tomb = pmc_next;
1680			in6_dev_put(pmc->idev);
1681			kfree(pmc);
1682		} else
1683			pmc_prev = pmc;
1684	}
1685	spin_unlock(&idev->mc_lock);
1686
1687	/* change recs */
1688	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1689		spin_lock_bh(&pmc->mca_lock);
1690		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1691			type = MLD2_BLOCK_OLD_SOURCES;
1692			dtype = MLD2_ALLOW_NEW_SOURCES;
1693		} else {
1694			type = MLD2_ALLOW_NEW_SOURCES;
1695			dtype = MLD2_BLOCK_OLD_SOURCES;
1696		}
1697		skb = add_grec(skb, pmc, type, 0, 0);
1698		skb = add_grec(skb, pmc, dtype, 0, 1);	/* deleted sources */
1699
1700		/* filter mode changes */
1701		if (pmc->mca_crcount) {
1702			if (pmc->mca_sfmode == MCAST_EXCLUDE)
1703				type = MLD2_CHANGE_TO_EXCLUDE;
1704			else
1705				type = MLD2_CHANGE_TO_INCLUDE;
1706			skb = add_grec(skb, pmc, type, 0, 0);
1707			pmc->mca_crcount--;
1708		}
1709		spin_unlock_bh(&pmc->mca_lock);
1710	}
1711	read_unlock_bh(&idev->lock);
1712	if (!skb)
1713		return;
1714	(void) mld_sendpack(skb);
1715}
1716
1717static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1718{
1719	struct net *net = dev_net(dev);
1720	struct sock *sk = net->ipv6.igmp_sk;
1721	struct inet6_dev *idev;
1722	struct sk_buff *skb;
1723	struct mld_msg *hdr;
1724	const struct in6_addr *snd_addr, *saddr;
1725	struct in6_addr addr_buf;
 
 
1726	int err, len, payload_len, full_len;
1727	u8 ra[8] = { IPPROTO_ICMPV6, 0,
1728		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1729		     IPV6_TLV_PADN, 0 };
1730	struct flowi6 fl6;
1731	struct dst_entry *dst;
1732
1733	if (type == ICMPV6_MGM_REDUCTION)
1734		snd_addr = &in6addr_linklocal_allrouters;
1735	else
1736		snd_addr = addr;
1737
1738	len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1739	payload_len = len + sizeof(ra);
1740	full_len = sizeof(struct ipv6hdr) + payload_len;
1741
1742	rcu_read_lock();
1743	IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1744		      IPSTATS_MIB_OUT, full_len);
1745	rcu_read_unlock();
1746
1747	skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
1748
1749	if (skb == NULL) {
1750		rcu_read_lock();
1751		IP6_INC_STATS(net, __in6_dev_get(dev),
1752			      IPSTATS_MIB_OUTDISCARDS);
1753		rcu_read_unlock();
1754		return;
1755	}
1756
1757	skb_reserve(skb, LL_RESERVED_SPACE(dev));
1758
1759	if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1760		/* <draft-ietf-magma-mld-source-05.txt>:
1761		 * use unspecified address as the source address
1762		 * when a valid link-local address is not available.
1763		 */
1764		saddr = &in6addr_any;
1765	} else
1766		saddr = &addr_buf;
1767
1768	ip6_nd_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
1769
1770	memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra));
1771
1772	hdr = (struct mld_msg *) skb_put(skb, sizeof(struct mld_msg));
1773	memset(hdr, 0, sizeof(struct mld_msg));
1774	hdr->mld_type = type;
1775	ipv6_addr_copy(&hdr->mld_mca, addr);
1776
1777	hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
1778					 IPPROTO_ICMPV6,
1779					 csum_partial(hdr, len, 0));
1780
1781	rcu_read_lock();
1782	idev = __in6_dev_get(skb->dev);
1783
1784	dst = icmp6_dst_alloc(skb->dev, NULL, &ipv6_hdr(skb)->daddr);
1785	if (!dst) {
1786		err = -ENOMEM;
1787		goto err_out;
1788	}
1789
1790	icmpv6_flow_init(sk, &fl6, type,
1791			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1792			 skb->dev->ifindex);
1793
1794	dst = xfrm_lookup(net, dst, flowi6_to_flowi(&fl6), NULL, 0);
1795	if (IS_ERR(dst)) {
1796		err = PTR_ERR(dst);
1797		goto err_out;
1798	}
1799
1800	skb_dst_set(skb, dst);
1801	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL, skb->dev,
1802		      dst_output);
1803out:
1804	if (!err) {
1805		ICMP6MSGOUT_INC_STATS(net, idev, type);
1806		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1807		IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUTMCAST, full_len);
1808	} else
1809		IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1810
1811	rcu_read_unlock();
1812	return;
1813
1814err_out:
1815	kfree_skb(skb);
1816	goto out;
1817}
1818
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1819static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
1820	const struct in6_addr *psfsrc)
1821{
1822	struct ip6_sf_list *psf, *psf_prev;
1823	int rv = 0;
1824
1825	psf_prev = NULL;
1826	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1827		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1828			break;
1829		psf_prev = psf;
1830	}
1831	if (!psf || psf->sf_count[sfmode] == 0) {
1832		/* source filter not found, or count wrong =>  bug */
1833		return -ESRCH;
1834	}
1835	psf->sf_count[sfmode]--;
1836	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1837		struct inet6_dev *idev = pmc->idev;
1838
1839		/* no more filters for this source */
1840		if (psf_prev)
1841			psf_prev->sf_next = psf->sf_next;
1842		else
1843			pmc->mca_sources = psf->sf_next;
1844		if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
1845		    !MLD_V1_SEEN(idev)) {
1846			psf->sf_crcount = idev->mc_qrv;
1847			psf->sf_next = pmc->mca_tomb;
1848			pmc->mca_tomb = psf;
1849			rv = 1;
1850		} else
1851			kfree(psf);
1852	}
1853	return rv;
1854}
1855
1856static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
1857			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
1858			  int delta)
1859{
1860	struct ifmcaddr6 *pmc;
1861	int	changerec = 0;
1862	int	i, err;
1863
1864	if (!idev)
1865		return -ENODEV;
1866	read_lock_bh(&idev->lock);
1867	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
1868		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
1869			break;
1870	}
1871	if (!pmc) {
1872		/* MCA not found?? bug */
1873		read_unlock_bh(&idev->lock);
1874		return -ESRCH;
1875	}
1876	spin_lock_bh(&pmc->mca_lock);
1877	sf_markstate(pmc);
1878	if (!delta) {
1879		if (!pmc->mca_sfcount[sfmode]) {
1880			spin_unlock_bh(&pmc->mca_lock);
1881			read_unlock_bh(&idev->lock);
1882			return -EINVAL;
1883		}
1884		pmc->mca_sfcount[sfmode]--;
1885	}
1886	err = 0;
1887	for (i=0; i<sfcount; i++) {
1888		int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1889
1890		changerec |= rv > 0;
1891		if (!err && rv < 0)
1892			err = rv;
1893	}
1894	if (pmc->mca_sfmode == MCAST_EXCLUDE &&
1895	    pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
1896	    pmc->mca_sfcount[MCAST_INCLUDE]) {
1897		struct ip6_sf_list *psf;
1898
1899		/* filter mode change */
1900		pmc->mca_sfmode = MCAST_INCLUDE;
1901		pmc->mca_crcount = idev->mc_qrv;
1902		idev->mc_ifc_count = pmc->mca_crcount;
1903		for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
1904			psf->sf_crcount = 0;
1905		mld_ifc_event(pmc->idev);
1906	} else if (sf_setstate(pmc) || changerec)
1907		mld_ifc_event(pmc->idev);
1908	spin_unlock_bh(&pmc->mca_lock);
1909	read_unlock_bh(&idev->lock);
1910	return err;
1911}
1912
1913/*
1914 * Add multicast single-source filter to the interface list
1915 */
1916static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
1917	const struct in6_addr *psfsrc, int delta)
1918{
1919	struct ip6_sf_list *psf, *psf_prev;
1920
1921	psf_prev = NULL;
1922	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1923		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
1924			break;
1925		psf_prev = psf;
1926	}
1927	if (!psf) {
1928		psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1929		if (!psf)
1930			return -ENOBUFS;
1931
1932		psf->sf_addr = *psfsrc;
1933		if (psf_prev) {
1934			psf_prev->sf_next = psf;
1935		} else
1936			pmc->mca_sources = psf;
1937	}
1938	psf->sf_count[sfmode]++;
1939	return 0;
1940}
1941
1942static void sf_markstate(struct ifmcaddr6 *pmc)
1943{
1944	struct ip6_sf_list *psf;
1945	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1946
1947	for (psf=pmc->mca_sources; psf; psf=psf->sf_next)
1948		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1949			psf->sf_oldin = mca_xcount ==
1950				psf->sf_count[MCAST_EXCLUDE] &&
1951				!psf->sf_count[MCAST_INCLUDE];
1952		} else
1953			psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1954}
1955
1956static int sf_setstate(struct ifmcaddr6 *pmc)
1957{
1958	struct ip6_sf_list *psf, *dpsf;
1959	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
1960	int qrv = pmc->idev->mc_qrv;
1961	int new_in, rv;
1962
1963	rv = 0;
1964	for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
1965		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1966			new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1967				!psf->sf_count[MCAST_INCLUDE];
1968		} else
1969			new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1970		if (new_in) {
1971			if (!psf->sf_oldin) {
1972				struct ip6_sf_list *prev = NULL;
1973
1974				for (dpsf=pmc->mca_tomb; dpsf;
1975				     dpsf=dpsf->sf_next) {
1976					if (ipv6_addr_equal(&dpsf->sf_addr,
1977					    &psf->sf_addr))
1978						break;
1979					prev = dpsf;
1980				}
1981				if (dpsf) {
1982					if (prev)
1983						prev->sf_next = dpsf->sf_next;
1984					else
1985						pmc->mca_tomb = dpsf->sf_next;
1986					kfree(dpsf);
1987				}
1988				psf->sf_crcount = qrv;
1989				rv++;
1990			}
1991		} else if (psf->sf_oldin) {
1992			psf->sf_crcount = 0;
1993			/*
1994			 * add or update "delete" records if an active filter
1995			 * is now inactive
1996			 */
1997			for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next)
1998				if (ipv6_addr_equal(&dpsf->sf_addr,
1999				    &psf->sf_addr))
2000					break;
2001			if (!dpsf) {
2002				dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2003				if (!dpsf)
2004					continue;
2005				*dpsf = *psf;
2006				/* pmc->mca_lock held by callers */
2007				dpsf->sf_next = pmc->mca_tomb;
2008				pmc->mca_tomb = dpsf;
2009			}
2010			dpsf->sf_crcount = qrv;
2011			rv++;
2012		}
2013	}
2014	return rv;
2015}
2016
2017/*
2018 * Add multicast source filter list to the interface list
2019 */
2020static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2021			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
2022			  int delta)
2023{
2024	struct ifmcaddr6 *pmc;
2025	int	isexclude;
2026	int	i, err;
2027
2028	if (!idev)
2029		return -ENODEV;
2030	read_lock_bh(&idev->lock);
2031	for (pmc=idev->mc_list; pmc; pmc=pmc->next) {
2032		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2033			break;
2034	}
2035	if (!pmc) {
2036		/* MCA not found?? bug */
2037		read_unlock_bh(&idev->lock);
2038		return -ESRCH;
2039	}
2040	spin_lock_bh(&pmc->mca_lock);
2041
2042	sf_markstate(pmc);
2043	isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2044	if (!delta)
2045		pmc->mca_sfcount[sfmode]++;
2046	err = 0;
2047	for (i=0; i<sfcount; i++) {
2048		err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
2049		if (err)
2050			break;
2051	}
2052	if (err) {
2053		int j;
2054
2055		if (!delta)
2056			pmc->mca_sfcount[sfmode]--;
2057		for (j=0; j<i; j++)
2058			(void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2059	} else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2060		struct ip6_sf_list *psf;
2061
2062		/* filter mode change */
2063		if (pmc->mca_sfcount[MCAST_EXCLUDE])
2064			pmc->mca_sfmode = MCAST_EXCLUDE;
2065		else if (pmc->mca_sfcount[MCAST_INCLUDE])
2066			pmc->mca_sfmode = MCAST_INCLUDE;
2067		/* else no filters; keep old mode for reports */
2068
2069		pmc->mca_crcount = idev->mc_qrv;
2070		idev->mc_ifc_count = pmc->mca_crcount;
2071		for (psf=pmc->mca_sources; psf; psf = psf->sf_next)
2072			psf->sf_crcount = 0;
2073		mld_ifc_event(idev);
2074	} else if (sf_setstate(pmc))
2075		mld_ifc_event(idev);
2076	spin_unlock_bh(&pmc->mca_lock);
2077	read_unlock_bh(&idev->lock);
2078	return err;
2079}
2080
2081static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2082{
2083	struct ip6_sf_list *psf, *nextpsf;
2084
2085	for (psf=pmc->mca_tomb; psf; psf=nextpsf) {
2086		nextpsf = psf->sf_next;
2087		kfree(psf);
2088	}
2089	pmc->mca_tomb = NULL;
2090	for (psf=pmc->mca_sources; psf; psf=nextpsf) {
2091		nextpsf = psf->sf_next;
2092		kfree(psf);
2093	}
2094	pmc->mca_sources = NULL;
2095	pmc->mca_sfmode = MCAST_EXCLUDE;
2096	pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2097	pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2098}
2099
2100
2101static void igmp6_join_group(struct ifmcaddr6 *ma)
2102{
2103	unsigned long delay;
2104
2105	if (ma->mca_flags & MAF_NOREPORT)
2106		return;
2107
2108	igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2109
2110	delay = net_random() % IGMP6_UNSOLICITED_IVAL;
2111
2112	spin_lock_bh(&ma->mca_lock);
2113	if (del_timer(&ma->mca_timer)) {
2114		atomic_dec(&ma->mca_refcnt);
2115		delay = ma->mca_timer.expires - jiffies;
2116	}
2117
2118	if (!mod_timer(&ma->mca_timer, jiffies + delay))
2119		atomic_inc(&ma->mca_refcnt);
2120	ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2121	spin_unlock_bh(&ma->mca_lock);
2122}
2123
2124static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2125			    struct inet6_dev *idev)
2126{
2127	int err;
2128
2129	/* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
2130	 * so no other readers or writers of iml or its sflist
2131	 */
2132	if (!iml->sflist) {
2133		/* any-source empty exclude case */
2134		return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2135	}
2136	err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2137		iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2138	sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2139	iml->sflist = NULL;
2140	return err;
2141}
2142
2143static void igmp6_leave_group(struct ifmcaddr6 *ma)
2144{
2145	if (MLD_V1_SEEN(ma->idev)) {
2146		if (ma->mca_flags & MAF_LAST_REPORTER)
2147			igmp6_send(&ma->mca_addr, ma->idev->dev,
2148				ICMPV6_MGM_REDUCTION);
2149	} else {
2150		mld_add_delrec(ma->idev, ma);
2151		mld_ifc_event(ma->idev);
2152	}
2153}
2154
2155static void mld_gq_timer_expire(unsigned long data)
2156{
2157	struct inet6_dev *idev = (struct inet6_dev *)data;
2158
2159	idev->mc_gq_running = 0;
2160	mld_send_report(idev, NULL);
2161	__in6_dev_put(idev);
2162}
2163
2164static void mld_ifc_timer_expire(unsigned long data)
2165{
2166	struct inet6_dev *idev = (struct inet6_dev *)data;
2167
2168	mld_send_cr(idev);
2169	if (idev->mc_ifc_count) {
2170		idev->mc_ifc_count--;
2171		if (idev->mc_ifc_count)
2172			mld_ifc_start_timer(idev, idev->mc_maxdelay);
2173	}
2174	__in6_dev_put(idev);
2175}
2176
2177static void mld_ifc_event(struct inet6_dev *idev)
2178{
2179	if (MLD_V1_SEEN(idev))
2180		return;
2181	idev->mc_ifc_count = idev->mc_qrv;
2182	mld_ifc_start_timer(idev, 1);
2183}
2184
2185
2186static void igmp6_timer_handler(unsigned long data)
2187{
2188	struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data;
2189
2190	if (MLD_V1_SEEN(ma->idev))
2191		igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2192	else
2193		mld_send_report(ma->idev, ma);
2194
2195	spin_lock(&ma->mca_lock);
2196	ma->mca_flags |=  MAF_LAST_REPORTER;
2197	ma->mca_flags &= ~MAF_TIMER_RUNNING;
2198	spin_unlock(&ma->mca_lock);
2199	ma_put(ma);
2200}
2201
2202/* Device changing type */
2203
2204void ipv6_mc_unmap(struct inet6_dev *idev)
2205{
2206	struct ifmcaddr6 *i;
2207
2208	/* Install multicast list, except for all-nodes (already installed) */
2209
2210	read_lock_bh(&idev->lock);
2211	for (i = idev->mc_list; i; i = i->next)
2212		igmp6_group_dropped(i);
2213	read_unlock_bh(&idev->lock);
2214}
2215
2216void ipv6_mc_remap(struct inet6_dev *idev)
2217{
2218	ipv6_mc_up(idev);
2219}
2220
2221/* Device going down */
2222
2223void ipv6_mc_down(struct inet6_dev *idev)
2224{
2225	struct ifmcaddr6 *i;
2226
2227	/* Withdraw multicast list */
2228
2229	read_lock_bh(&idev->lock);
2230	idev->mc_ifc_count = 0;
2231	if (del_timer(&idev->mc_ifc_timer))
2232		__in6_dev_put(idev);
2233	idev->mc_gq_running = 0;
2234	if (del_timer(&idev->mc_gq_timer))
2235		__in6_dev_put(idev);
2236
2237	for (i = idev->mc_list; i; i=i->next)
2238		igmp6_group_dropped(i);
2239	read_unlock_bh(&idev->lock);
2240
2241	mld_clear_delrec(idev);
2242}
2243
2244
2245/* Device going up */
2246
2247void ipv6_mc_up(struct inet6_dev *idev)
2248{
2249	struct ifmcaddr6 *i;
2250
2251	/* Install multicast list, except for all-nodes (already installed) */
2252
2253	read_lock_bh(&idev->lock);
2254	for (i = idev->mc_list; i; i=i->next)
2255		igmp6_group_added(i);
2256	read_unlock_bh(&idev->lock);
2257}
2258
2259/* IPv6 device initialization. */
2260
2261void ipv6_mc_init_dev(struct inet6_dev *idev)
2262{
2263	write_lock_bh(&idev->lock);
2264	spin_lock_init(&idev->mc_lock);
2265	idev->mc_gq_running = 0;
2266	setup_timer(&idev->mc_gq_timer, mld_gq_timer_expire,
2267			(unsigned long)idev);
2268	idev->mc_tomb = NULL;
2269	idev->mc_ifc_count = 0;
2270	setup_timer(&idev->mc_ifc_timer, mld_ifc_timer_expire,
2271			(unsigned long)idev);
 
 
 
2272	idev->mc_qrv = MLD_QRV_DEFAULT;
2273	idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
 
 
 
2274	idev->mc_v1_seen = 0;
2275	write_unlock_bh(&idev->lock);
2276}
2277
2278/*
2279 *	Device is about to be destroyed: clean up.
2280 */
2281
2282void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2283{
2284	struct ifmcaddr6 *i;
2285
2286	/* Deactivate timers */
2287	ipv6_mc_down(idev);
2288
2289	/* Delete all-nodes address. */
2290	/* We cannot call ipv6_dev_mc_dec() directly, our caller in
2291	 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2292	 * fail.
2293	 */
2294	__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2295
2296	if (idev->cnf.forwarding)
2297		__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2298
2299	write_lock_bh(&idev->lock);
2300	while ((i = idev->mc_list) != NULL) {
2301		idev->mc_list = i->next;
2302		write_unlock_bh(&idev->lock);
2303
2304		igmp6_group_dropped(i);
2305		ma_put(i);
2306
2307		write_lock_bh(&idev->lock);
2308	}
2309	write_unlock_bh(&idev->lock);
2310}
2311
2312#ifdef CONFIG_PROC_FS
2313struct igmp6_mc_iter_state {
2314	struct seq_net_private p;
2315	struct net_device *dev;
2316	struct inet6_dev *idev;
2317};
2318
2319#define igmp6_mc_seq_private(seq)	((struct igmp6_mc_iter_state *)(seq)->private)
2320
2321static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2322{
2323	struct ifmcaddr6 *im = NULL;
2324	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2325	struct net *net = seq_file_net(seq);
2326
2327	state->idev = NULL;
2328	for_each_netdev_rcu(net, state->dev) {
2329		struct inet6_dev *idev;
2330		idev = __in6_dev_get(state->dev);
2331		if (!idev)
2332			continue;
2333		read_lock_bh(&idev->lock);
2334		im = idev->mc_list;
2335		if (im) {
2336			state->idev = idev;
2337			break;
2338		}
2339		read_unlock_bh(&idev->lock);
2340	}
2341	return im;
2342}
2343
2344static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2345{
2346	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2347
2348	im = im->next;
2349	while (!im) {
2350		if (likely(state->idev != NULL))
2351			read_unlock_bh(&state->idev->lock);
2352
2353		state->dev = next_net_device_rcu(state->dev);
2354		if (!state->dev) {
2355			state->idev = NULL;
2356			break;
2357		}
2358		state->idev = __in6_dev_get(state->dev);
2359		if (!state->idev)
2360			continue;
2361		read_lock_bh(&state->idev->lock);
2362		im = state->idev->mc_list;
2363	}
2364	return im;
2365}
2366
2367static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2368{
2369	struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2370	if (im)
2371		while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2372			--pos;
2373	return pos ? NULL : im;
2374}
2375
2376static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2377	__acquires(RCU)
2378{
2379	rcu_read_lock();
2380	return igmp6_mc_get_idx(seq, *pos);
2381}
2382
2383static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2384{
2385	struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2386
2387	++*pos;
2388	return im;
2389}
2390
2391static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2392	__releases(RCU)
2393{
2394	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2395
2396	if (likely(state->idev != NULL)) {
2397		read_unlock_bh(&state->idev->lock);
2398		state->idev = NULL;
2399	}
2400	state->dev = NULL;
2401	rcu_read_unlock();
2402}
2403
2404static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2405{
2406	struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2407	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2408
2409	seq_printf(seq,
2410		   "%-4d %-15s %pi6 %5d %08X %ld\n",
2411		   state->dev->ifindex, state->dev->name,
2412		   &im->mca_addr,
2413		   im->mca_users, im->mca_flags,
2414		   (im->mca_flags&MAF_TIMER_RUNNING) ?
2415		   jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2416	return 0;
2417}
2418
2419static const struct seq_operations igmp6_mc_seq_ops = {
2420	.start	=	igmp6_mc_seq_start,
2421	.next	=	igmp6_mc_seq_next,
2422	.stop	=	igmp6_mc_seq_stop,
2423	.show	=	igmp6_mc_seq_show,
2424};
2425
2426static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2427{
2428	return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2429			    sizeof(struct igmp6_mc_iter_state));
2430}
2431
2432static const struct file_operations igmp6_mc_seq_fops = {
2433	.owner		=	THIS_MODULE,
2434	.open		=	igmp6_mc_seq_open,
2435	.read		=	seq_read,
2436	.llseek		=	seq_lseek,
2437	.release	=	seq_release_net,
2438};
2439
2440struct igmp6_mcf_iter_state {
2441	struct seq_net_private p;
2442	struct net_device *dev;
2443	struct inet6_dev *idev;
2444	struct ifmcaddr6 *im;
2445};
2446
2447#define igmp6_mcf_seq_private(seq)	((struct igmp6_mcf_iter_state *)(seq)->private)
2448
2449static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2450{
2451	struct ip6_sf_list *psf = NULL;
2452	struct ifmcaddr6 *im = NULL;
2453	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2454	struct net *net = seq_file_net(seq);
2455
2456	state->idev = NULL;
2457	state->im = NULL;
2458	for_each_netdev_rcu(net, state->dev) {
2459		struct inet6_dev *idev;
2460		idev = __in6_dev_get(state->dev);
2461		if (unlikely(idev == NULL))
2462			continue;
2463		read_lock_bh(&idev->lock);
2464		im = idev->mc_list;
2465		if (likely(im != NULL)) {
2466			spin_lock_bh(&im->mca_lock);
2467			psf = im->mca_sources;
2468			if (likely(psf != NULL)) {
2469				state->im = im;
2470				state->idev = idev;
2471				break;
2472			}
2473			spin_unlock_bh(&im->mca_lock);
2474		}
2475		read_unlock_bh(&idev->lock);
2476	}
2477	return psf;
2478}
2479
2480static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2481{
2482	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2483
2484	psf = psf->sf_next;
2485	while (!psf) {
2486		spin_unlock_bh(&state->im->mca_lock);
2487		state->im = state->im->next;
2488		while (!state->im) {
2489			if (likely(state->idev != NULL))
2490				read_unlock_bh(&state->idev->lock);
2491
2492			state->dev = next_net_device_rcu(state->dev);
2493			if (!state->dev) {
2494				state->idev = NULL;
2495				goto out;
2496			}
2497			state->idev = __in6_dev_get(state->dev);
2498			if (!state->idev)
2499				continue;
2500			read_lock_bh(&state->idev->lock);
2501			state->im = state->idev->mc_list;
2502		}
2503		if (!state->im)
2504			break;
2505		spin_lock_bh(&state->im->mca_lock);
2506		psf = state->im->mca_sources;
2507	}
2508out:
2509	return psf;
2510}
2511
2512static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2513{
2514	struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2515	if (psf)
2516		while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2517			--pos;
2518	return pos ? NULL : psf;
2519}
2520
2521static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2522	__acquires(RCU)
2523{
2524	rcu_read_lock();
2525	return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2526}
2527
2528static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2529{
2530	struct ip6_sf_list *psf;
2531	if (v == SEQ_START_TOKEN)
2532		psf = igmp6_mcf_get_first(seq);
2533	else
2534		psf = igmp6_mcf_get_next(seq, v);
2535	++*pos;
2536	return psf;
2537}
2538
2539static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2540	__releases(RCU)
2541{
2542	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2543	if (likely(state->im != NULL)) {
2544		spin_unlock_bh(&state->im->mca_lock);
2545		state->im = NULL;
2546	}
2547	if (likely(state->idev != NULL)) {
2548		read_unlock_bh(&state->idev->lock);
2549		state->idev = NULL;
2550	}
2551	state->dev = NULL;
2552	rcu_read_unlock();
2553}
2554
2555static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2556{
2557	struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2558	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2559
2560	if (v == SEQ_START_TOKEN) {
2561		seq_printf(seq,
2562			   "%3s %6s "
2563			   "%32s %32s %6s %6s\n", "Idx",
2564			   "Device", "Multicast Address",
2565			   "Source Address", "INC", "EXC");
2566	} else {
2567		seq_printf(seq,
2568			   "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2569			   state->dev->ifindex, state->dev->name,
2570			   &state->im->mca_addr,
2571			   &psf->sf_addr,
2572			   psf->sf_count[MCAST_INCLUDE],
2573			   psf->sf_count[MCAST_EXCLUDE]);
2574	}
2575	return 0;
2576}
2577
2578static const struct seq_operations igmp6_mcf_seq_ops = {
2579	.start	=	igmp6_mcf_seq_start,
2580	.next	=	igmp6_mcf_seq_next,
2581	.stop	=	igmp6_mcf_seq_stop,
2582	.show	=	igmp6_mcf_seq_show,
2583};
2584
2585static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2586{
2587	return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2588			    sizeof(struct igmp6_mcf_iter_state));
2589}
2590
2591static const struct file_operations igmp6_mcf_seq_fops = {
2592	.owner		=	THIS_MODULE,
2593	.open		=	igmp6_mcf_seq_open,
2594	.read		=	seq_read,
2595	.llseek		=	seq_lseek,
2596	.release	=	seq_release_net,
2597};
2598
2599static int __net_init igmp6_proc_init(struct net *net)
2600{
2601	int err;
2602
2603	err = -ENOMEM;
2604	if (!proc_net_fops_create(net, "igmp6", S_IRUGO, &igmp6_mc_seq_fops))
2605		goto out;
2606	if (!proc_net_fops_create(net, "mcfilter6", S_IRUGO,
2607				  &igmp6_mcf_seq_fops))
2608		goto out_proc_net_igmp6;
2609
2610	err = 0;
2611out:
2612	return err;
2613
2614out_proc_net_igmp6:
2615	proc_net_remove(net, "igmp6");
2616	goto out;
2617}
2618
2619static void __net_exit igmp6_proc_exit(struct net *net)
2620{
2621	proc_net_remove(net, "mcfilter6");
2622	proc_net_remove(net, "igmp6");
2623}
2624#else
2625static inline int igmp6_proc_init(struct net *net)
2626{
2627	return 0;
2628}
2629static inline void igmp6_proc_exit(struct net *net)
2630{
2631}
2632#endif
2633
2634static int __net_init igmp6_net_init(struct net *net)
2635{
2636	int err;
2637
2638	err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2639				   SOCK_RAW, IPPROTO_ICMPV6, net);
2640	if (err < 0) {
2641		printk(KERN_ERR
2642		       "Failed to initialize the IGMP6 control socket (err %d).\n",
2643		       err);
2644		goto out;
2645	}
2646
2647	inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2648
2649	err = igmp6_proc_init(net);
2650	if (err)
2651		goto out_sock_create;
2652out:
2653	return err;
2654
2655out_sock_create:
2656	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2657	goto out;
2658}
2659
2660static void __net_exit igmp6_net_exit(struct net *net)
2661{
2662	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2663	igmp6_proc_exit(net);
2664}
2665
2666static struct pernet_operations igmp6_net_ops = {
2667	.init = igmp6_net_init,
2668	.exit = igmp6_net_exit,
2669};
2670
2671int __init igmp6_init(void)
2672{
2673	return register_pernet_subsys(&igmp6_net_ops);
2674}
2675
2676void igmp6_cleanup(void)
2677{
2678	unregister_pernet_subsys(&igmp6_net_ops);
2679}