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