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v4.17
 
   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 <linux/pkt_sched.h>
  48#include <net/mld.h>
  49
  50#include <linux/netfilter.h>
  51#include <linux/netfilter_ipv6.h>
  52
  53#include <net/net_namespace.h>
  54#include <net/sock.h>
  55#include <net/snmp.h>
  56
  57#include <net/ipv6.h>
  58#include <net/protocol.h>
  59#include <net/if_inet6.h>
  60#include <net/ndisc.h>
  61#include <net/addrconf.h>
  62#include <net/ip6_route.h>
  63#include <net/inet_common.h>
  64
  65#include <net/ip6_checksum.h>
  66
  67/* Ensure that we have struct in6_addr aligned on 32bit word. */
  68static int __mld2_query_bugs[] __attribute__((__unused__)) = {
  69	BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
  70	BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
  71	BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
  72};
  73
  74static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  75
  76static void igmp6_join_group(struct ifmcaddr6 *ma);
  77static void igmp6_leave_group(struct ifmcaddr6 *ma);
  78static void igmp6_timer_handler(struct timer_list *t);
  79
  80static void mld_gq_timer_expire(struct timer_list *t);
  81static void mld_ifc_timer_expire(struct timer_list *t);
  82static void mld_ifc_event(struct inet6_dev *idev);
  83static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  84static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  85static void mld_clear_delrec(struct inet6_dev *idev);
  86static bool mld_in_v1_mode(const struct inet6_dev *idev);
  87static int sf_setstate(struct ifmcaddr6 *pmc);
  88static void sf_markstate(struct ifmcaddr6 *pmc);
  89static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
  90static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  91			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
  92			  int delta);
  93static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  94			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
  95			  int delta);
  96static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
  97			    struct inet6_dev *idev);
 
 
  98
  99#define MLD_QRV_DEFAULT		2
 100/* RFC3810, 9.2. Query Interval */
 101#define MLD_QI_DEFAULT		(125 * HZ)
 102/* RFC3810, 9.3. Query Response Interval */
 103#define MLD_QRI_DEFAULT		(10 * HZ)
 104
 105/* RFC3810, 8.1 Query Version Distinctions */
 106#define MLD_V1_QUERY_LEN	24
 107#define MLD_V2_QUERY_LEN_MIN	28
 108
 109#define IPV6_MLD_MAX_MSF	64
 110
 111int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 112int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
 113
 114/*
 115 *	socket join on multicast group
 116 */
 117
 118#define for_each_pmc_rcu(np, pmc)				\
 119	for (pmc = rcu_dereference(np->ipv6_mc_list);		\
 120	     pmc != NULL;					\
 121	     pmc = rcu_dereference(pmc->next))
 122
 123static int unsolicited_report_interval(struct inet6_dev *idev)
 124{
 125	int iv;
 126
 127	if (mld_in_v1_mode(idev))
 128		iv = idev->cnf.mldv1_unsolicited_report_interval;
 129	else
 130		iv = idev->cnf.mldv2_unsolicited_report_interval;
 131
 132	return iv > 0 ? iv : 1;
 133}
 134
 135int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 
 136{
 137	struct net_device *dev = NULL;
 138	struct ipv6_mc_socklist *mc_lst;
 139	struct ipv6_pinfo *np = inet6_sk(sk);
 140	struct net *net = sock_net(sk);
 141	int err;
 142
 143	ASSERT_RTNL();
 144
 145	if (!ipv6_addr_is_multicast(addr))
 146		return -EINVAL;
 147
 148	rcu_read_lock();
 149	for_each_pmc_rcu(np, mc_lst) {
 150		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 151		    ipv6_addr_equal(&mc_lst->addr, addr)) {
 152			rcu_read_unlock();
 153			return -EADDRINUSE;
 154		}
 155	}
 156	rcu_read_unlock();
 157
 158	mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 159
 160	if (!mc_lst)
 161		return -ENOMEM;
 162
 163	mc_lst->next = NULL;
 164	mc_lst->addr = *addr;
 165
 166	if (ifindex == 0) {
 167		struct rt6_info *rt;
 168		rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
 169		if (rt) {
 170			dev = rt->dst.dev;
 171			ip6_rt_put(rt);
 172		}
 173	} else
 174		dev = __dev_get_by_index(net, ifindex);
 175
 176	if (!dev) {
 177		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 178		return -ENODEV;
 179	}
 180
 181	mc_lst->ifindex = dev->ifindex;
 182	mc_lst->sfmode = MCAST_EXCLUDE;
 183	rwlock_init(&mc_lst->sflock);
 184	mc_lst->sflist = NULL;
 185
 186	/*
 187	 *	now add/increase the group membership on the device
 188	 */
 189
 190	err = ipv6_dev_mc_inc(dev, addr);
 191
 192	if (err) {
 193		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 194		return err;
 195	}
 196
 197	mc_lst->next = np->ipv6_mc_list;
 198	rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 199
 200	return 0;
 201}
 
 
 
 
 
 202EXPORT_SYMBOL(ipv6_sock_mc_join);
 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	ASSERT_RTNL();
 215
 216	if (!ipv6_addr_is_multicast(addr))
 217		return -EINVAL;
 218
 219	for (lnk = &np->ipv6_mc_list;
 220	     (mc_lst = rtnl_dereference(*lnk)) != NULL;
 221	      lnk = &mc_lst->next) {
 222		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 223		    ipv6_addr_equal(&mc_lst->addr, addr)) {
 224			struct net_device *dev;
 225
 226			*lnk = mc_lst->next;
 227
 228			dev = __dev_get_by_index(net, mc_lst->ifindex);
 229			if (dev) {
 230				struct inet6_dev *idev = __in6_dev_get(dev);
 231
 232				(void) ip6_mc_leave_src(sk, mc_lst, idev);
 233				if (idev)
 234					__ipv6_dev_mc_dec(idev, &mc_lst->addr);
 235			} else
 236				(void) ip6_mc_leave_src(sk, mc_lst, NULL);
 237
 238			atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 239			kfree_rcu(mc_lst, rcu);
 240			return 0;
 241		}
 242	}
 243
 244	return -EADDRNOTAVAIL;
 245}
 246EXPORT_SYMBOL(ipv6_sock_mc_drop);
 247
 248/* called with rcu_read_lock() */
 249static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 250					     const struct in6_addr *group,
 251					     int ifindex)
 252{
 253	struct net_device *dev = NULL;
 254	struct inet6_dev *idev = NULL;
 255
 256	if (ifindex == 0) {
 257		struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
 258
 259		if (rt) {
 260			dev = rt->dst.dev;
 261			ip6_rt_put(rt);
 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	ASSERT_RTNL();
 286
 287	while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
 288		struct net_device *dev;
 289
 290		np->ipv6_mc_list = mc_lst->next;
 291
 292		dev = __dev_get_by_index(net, mc_lst->ifindex);
 293		if (dev) {
 294			struct inet6_dev *idev = __in6_dev_get(dev);
 295
 296			(void) ip6_mc_leave_src(sk, mc_lst, idev);
 297			if (idev)
 298				__ipv6_dev_mc_dec(idev, &mc_lst->addr);
 299		} else
 300			(void) ip6_mc_leave_src(sk, mc_lst, NULL);
 301
 302		atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 303		kfree_rcu(mc_lst, rcu);
 304	}
 305}
 306
 307void ipv6_sock_mc_close(struct sock *sk)
 308{
 309	struct ipv6_pinfo *np = inet6_sk(sk);
 310
 311	if (!rcu_access_pointer(np->ipv6_mc_list))
 312		return;
 313	rtnl_lock();
 314	__ipv6_sock_mc_close(sk);
 315	rtnl_unlock();
 316}
 317
 318int ip6_mc_source(int add, int omode, struct sock *sk,
 319	struct group_source_req *pgsr)
 320{
 321	struct in6_addr *source, *group;
 322	struct ipv6_mc_socklist *pmc;
 323	struct inet6_dev *idev;
 324	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 325	struct ip6_sf_socklist *psl;
 326	struct net *net = sock_net(sk);
 327	int i, j, rv;
 328	int leavegroup = 0;
 329	int pmclocked = 0;
 330	int err;
 331
 332	source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 333	group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 334
 335	if (!ipv6_addr_is_multicast(group))
 336		return -EINVAL;
 337
 338	rcu_read_lock();
 339	idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 340	if (!idev) {
 341		rcu_read_unlock();
 342		return -ENODEV;
 343	}
 344
 345	err = -EADDRNOTAVAIL;
 346
 347	for_each_pmc_rcu(inet6, pmc) {
 348		if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 349			continue;
 350		if (ipv6_addr_equal(&pmc->addr, group))
 351			break;
 352	}
 353	if (!pmc) {		/* must have a prior join */
 354		err = -EINVAL;
 355		goto done;
 356	}
 357	/* if a source filter was set, must be the same mode as before */
 358	if (pmc->sflist) {
 359		if (pmc->sfmode != omode) {
 360			err = -EINVAL;
 361			goto done;
 362		}
 363	} else if (pmc->sfmode != omode) {
 364		/* allow mode switches for empty-set filters */
 365		ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 366		ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 367		pmc->sfmode = omode;
 368	}
 369
 370	write_lock(&pmc->sflock);
 371	pmclocked = 1;
 372
 373	psl = pmc->sflist;
 374	if (!add) {
 375		if (!psl)
 376			goto done;	/* err = -EADDRNOTAVAIL */
 377		rv = !0;
 378		for (i = 0; i < psl->sl_count; i++) {
 379			rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 380			if (rv == 0)
 381				break;
 382		}
 383		if (rv)		/* source not found */
 384			goto done;	/* err = -EADDRNOTAVAIL */
 385
 386		/* special case - (INCLUDE, empty) == LEAVE_GROUP */
 387		if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 388			leavegroup = 1;
 389			goto done;
 390		}
 391
 392		/* update the interface filter */
 393		ip6_mc_del_src(idev, group, omode, 1, source, 1);
 394
 395		for (j = i+1; j < psl->sl_count; j++)
 396			psl->sl_addr[j-1] = psl->sl_addr[j];
 397		psl->sl_count--;
 398		err = 0;
 399		goto done;
 400	}
 401	/* else, add a new source to the filter */
 402
 403	if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 404		err = -ENOBUFS;
 405		goto done;
 406	}
 407	if (!psl || psl->sl_count == psl->sl_max) {
 408		struct ip6_sf_socklist *newpsl;
 409		int count = IP6_SFBLOCK;
 410
 411		if (psl)
 412			count += psl->sl_max;
 413		newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 414		if (!newpsl) {
 415			err = -ENOBUFS;
 416			goto done;
 417		}
 418		newpsl->sl_max = count;
 419		newpsl->sl_count = count - IP6_SFBLOCK;
 420		if (psl) {
 421			for (i = 0; i < psl->sl_count; i++)
 422				newpsl->sl_addr[i] = psl->sl_addr[i];
 423			sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 424		}
 425		pmc->sflist = psl = newpsl;
 426	}
 427	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
 428	for (i = 0; i < psl->sl_count; i++) {
 429		rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 430		if (rv == 0) /* There is an error in the address. */
 431			goto done;
 432	}
 433	for (j = psl->sl_count-1; j >= i; j--)
 434		psl->sl_addr[j+1] = psl->sl_addr[j];
 435	psl->sl_addr[i] = *source;
 436	psl->sl_count++;
 437	err = 0;
 438	/* update the interface list */
 439	ip6_mc_add_src(idev, group, omode, 1, source, 1);
 440done:
 441	if (pmclocked)
 442		write_unlock(&pmc->sflock);
 443	read_unlock_bh(&idev->lock);
 444	rcu_read_unlock();
 445	if (leavegroup)
 446		err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 447	return err;
 448}
 449
 450int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 451{
 452	const struct in6_addr *group;
 453	struct ipv6_mc_socklist *pmc;
 454	struct inet6_dev *idev;
 455	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 456	struct ip6_sf_socklist *newpsl, *psl;
 457	struct net *net = sock_net(sk);
 458	int leavegroup = 0;
 459	int i, err;
 460
 461	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 462
 463	if (!ipv6_addr_is_multicast(group))
 464		return -EINVAL;
 465	if (gsf->gf_fmode != MCAST_INCLUDE &&
 466	    gsf->gf_fmode != MCAST_EXCLUDE)
 467		return -EINVAL;
 468
 469	rcu_read_lock();
 470	idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 471
 472	if (!idev) {
 473		rcu_read_unlock();
 474		return -ENODEV;
 475	}
 476
 477	err = 0;
 478
 479	if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 480		leavegroup = 1;
 481		goto done;
 482	}
 483
 484	for_each_pmc_rcu(inet6, pmc) {
 485		if (pmc->ifindex != gsf->gf_interface)
 486			continue;
 487		if (ipv6_addr_equal(&pmc->addr, group))
 488			break;
 489	}
 490	if (!pmc) {		/* must have a prior join */
 491		err = -EINVAL;
 492		goto done;
 493	}
 494	if (gsf->gf_numsrc) {
 495		newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 496							  GFP_ATOMIC);
 497		if (!newpsl) {
 498			err = -ENOBUFS;
 499			goto done;
 500		}
 501		newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 502		for (i = 0; i < newpsl->sl_count; ++i) {
 503			struct sockaddr_in6 *psin6;
 504
 505			psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 506			newpsl->sl_addr[i] = psin6->sin6_addr;
 507		}
 508		err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 509			newpsl->sl_count, newpsl->sl_addr, 0);
 510		if (err) {
 511			sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 512			goto done;
 513		}
 514	} else {
 515		newpsl = NULL;
 516		(void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 517	}
 518
 519	write_lock(&pmc->sflock);
 520	psl = pmc->sflist;
 521	if (psl) {
 522		(void) ip6_mc_del_src(idev, group, pmc->sfmode,
 523			psl->sl_count, psl->sl_addr, 0);
 524		sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 525	} else
 526		(void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 527	pmc->sflist = newpsl;
 528	pmc->sfmode = gsf->gf_fmode;
 529	write_unlock(&pmc->sflock);
 530	err = 0;
 531done:
 532	read_unlock_bh(&idev->lock);
 533	rcu_read_unlock();
 534	if (leavegroup)
 535		err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 536	return err;
 537}
 538
 539int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 540	struct group_filter __user *optval, int __user *optlen)
 541{
 542	int err, i, count, copycount;
 543	const struct in6_addr *group;
 544	struct ipv6_mc_socklist *pmc;
 545	struct inet6_dev *idev;
 546	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 547	struct ip6_sf_socklist *psl;
 548	struct net *net = sock_net(sk);
 549
 550	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 551
 552	if (!ipv6_addr_is_multicast(group))
 553		return -EINVAL;
 554
 555	rcu_read_lock();
 556	idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 557
 558	if (!idev) {
 559		rcu_read_unlock();
 560		return -ENODEV;
 561	}
 562
 563	err = -EADDRNOTAVAIL;
 564	/* changes to the ipv6_mc_list require the socket lock and
 565	 * rtnl lock. We have the socket lock and rcu read lock,
 566	 * so reading the list is safe.
 567	 */
 568
 569	for_each_pmc_rcu(inet6, pmc) {
 570		if (pmc->ifindex != gsf->gf_interface)
 571			continue;
 572		if (ipv6_addr_equal(group, &pmc->addr))
 573			break;
 574	}
 575	if (!pmc)		/* must have a prior join */
 576		goto done;
 577	gsf->gf_fmode = pmc->sfmode;
 578	psl = pmc->sflist;
 579	count = psl ? psl->sl_count : 0;
 580	read_unlock_bh(&idev->lock);
 581	rcu_read_unlock();
 582
 583	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 584	gsf->gf_numsrc = count;
 585	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 586	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 587		return -EFAULT;
 588	}
 589	/* changes to psl require the socket lock, and a write lock
 590	 * on pmc->sflock. We 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
 610bool 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	bool rv = true;
 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 true;
 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 = false;
 640		if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 641			rv = false;
 642	}
 643	read_unlock(&mc->sflock);
 644	rcu_read_unlock();
 645
 646	return rv;
 647}
 648
 649static void igmp6_group_added(struct ifmcaddr6 *mc)
 650{
 651	struct net_device *dev = mc->idev->dev;
 652	char buf[MAX_ADDR_LEN];
 653
 654	if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 655	    IPV6_ADDR_SCOPE_LINKLOCAL)
 656		return;
 657
 658	spin_lock_bh(&mc->mca_lock);
 659	if (!(mc->mca_flags&MAF_LOADED)) {
 660		mc->mca_flags |= MAF_LOADED;
 661		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 662			dev_mc_add(dev, buf);
 663	}
 664	spin_unlock_bh(&mc->mca_lock);
 665
 666	if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 667		return;
 668
 669	if (mld_in_v1_mode(mc->idev)) {
 670		igmp6_join_group(mc);
 671		return;
 672	}
 673	/* else v2 */
 674
 675	mc->mca_crcount = mc->idev->mc_qrv;
 
 
 
 
 
 
 676	mld_ifc_event(mc->idev);
 677}
 678
 679static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 680{
 681	struct net_device *dev = mc->idev->dev;
 682	char buf[MAX_ADDR_LEN];
 683
 684	if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 685	    IPV6_ADDR_SCOPE_LINKLOCAL)
 686		return;
 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	spin_unlock_bh(&mc->mca_lock);
 696	if (mc->mca_flags & MAF_NOREPORT)
 697		return;
 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		refcount_dec(&mc->mca_refcnt);
 705	spin_unlock_bh(&mc->mca_lock);
 706}
 707
 708/*
 709 * deleted ifmcaddr6 manipulation
 710 */
 711static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 712{
 713	struct ifmcaddr6 *pmc;
 714
 715	/* this is an "ifmcaddr6" for convenience; only the fields below
 716	 * are actually used. In particular, the refcnt and users are not
 717	 * used for management of the delete list. Using the same structure
 718	 * for deleted items allows change reports to use common code with
 719	 * non-deleted or query-response MCA's.
 720	 */
 721	pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 722	if (!pmc)
 723		return;
 724
 725	spin_lock_bh(&im->mca_lock);
 726	spin_lock_init(&pmc->mca_lock);
 727	pmc->idev = im->idev;
 728	in6_dev_hold(idev);
 729	pmc->mca_addr = im->mca_addr;
 730	pmc->mca_crcount = idev->mc_qrv;
 731	pmc->mca_sfmode = im->mca_sfmode;
 732	if (pmc->mca_sfmode == MCAST_INCLUDE) {
 733		struct ip6_sf_list *psf;
 734
 735		pmc->mca_tomb = im->mca_tomb;
 736		pmc->mca_sources = im->mca_sources;
 737		im->mca_tomb = im->mca_sources = NULL;
 738		for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
 739			psf->sf_crcount = pmc->mca_crcount;
 740	}
 741	spin_unlock_bh(&im->mca_lock);
 742
 743	spin_lock_bh(&idev->mc_lock);
 744	pmc->next = idev->mc_tomb;
 745	idev->mc_tomb = pmc;
 746	spin_unlock_bh(&idev->mc_lock);
 747}
 748
 749static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 750{
 751	struct ifmcaddr6 *pmc, *pmc_prev;
 752	struct ip6_sf_list *psf;
 753	struct in6_addr *pmca = &im->mca_addr;
 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	spin_lock_bh(&im->mca_lock);
 771	if (pmc) {
 772		im->idev = pmc->idev;
 773		im->mca_crcount = idev->mc_qrv;
 774		im->mca_sfmode = pmc->mca_sfmode;
 775		if (pmc->mca_sfmode == MCAST_INCLUDE) {
 776			im->mca_tomb = pmc->mca_tomb;
 777			im->mca_sources = pmc->mca_sources;
 778			for (psf = im->mca_sources; psf; psf = psf->sf_next)
 779				psf->sf_crcount = im->mca_crcount;
 
 
 780		}
 781		in6_dev_put(pmc->idev);
 
 782		kfree(pmc);
 783	}
 784	spin_unlock_bh(&im->mca_lock);
 785}
 786
 787static void mld_clear_delrec(struct inet6_dev *idev)
 788{
 789	struct ifmcaddr6 *pmc, *nextpmc;
 790
 791	spin_lock_bh(&idev->mc_lock);
 792	pmc = idev->mc_tomb;
 793	idev->mc_tomb = NULL;
 794	spin_unlock_bh(&idev->mc_lock);
 795
 796	for (; pmc; pmc = nextpmc) {
 797		nextpmc = pmc->next;
 798		ip6_mc_clear_src(pmc);
 799		in6_dev_put(pmc->idev);
 800		kfree(pmc);
 801	}
 802
 803	/* clear dead sources, too */
 804	read_lock_bh(&idev->lock);
 805	for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
 806		struct ip6_sf_list *psf, *psf_next;
 807
 808		spin_lock_bh(&pmc->mca_lock);
 809		psf = pmc->mca_tomb;
 810		pmc->mca_tomb = NULL;
 811		spin_unlock_bh(&pmc->mca_lock);
 812		for (; psf; psf = psf_next) {
 813			psf_next = psf->sf_next;
 814			kfree(psf);
 815		}
 816	}
 817	read_unlock_bh(&idev->lock);
 818}
 819
 820static void mca_get(struct ifmcaddr6 *mc)
 821{
 822	refcount_inc(&mc->mca_refcnt);
 823}
 824
 825static void ma_put(struct ifmcaddr6 *mc)
 826{
 827	if (refcount_dec_and_test(&mc->mca_refcnt)) {
 828		in6_dev_put(mc->idev);
 829		kfree(mc);
 830	}
 831}
 832
 833static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
 834				   const struct in6_addr *addr)
 
 835{
 836	struct ifmcaddr6 *mc;
 837
 838	mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
 839	if (!mc)
 840		return NULL;
 841
 842	timer_setup(&mc->mca_timer, igmp6_timer_handler, 0);
 843
 844	mc->mca_addr = *addr;
 845	mc->idev = idev; /* reference taken by caller */
 846	mc->mca_users = 1;
 847	/* mca_stamp should be updated upon changes */
 848	mc->mca_cstamp = mc->mca_tstamp = jiffies;
 849	refcount_set(&mc->mca_refcnt, 1);
 850	spin_lock_init(&mc->mca_lock);
 851
 852	/* initial mode is (EX, empty) */
 853	mc->mca_sfmode = MCAST_EXCLUDE;
 854	mc->mca_sfcount[MCAST_EXCLUDE] = 1;
 855
 856	if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
 857	    IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
 858		mc->mca_flags |= MAF_NOREPORT;
 859
 860	return mc;
 861}
 862
 863/*
 864 *	device multicast group inc (add if not found)
 865 */
 866int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 
 867{
 868	struct ifmcaddr6 *mc;
 869	struct inet6_dev *idev;
 870
 871	ASSERT_RTNL();
 872
 873	/* we need to take a reference on idev */
 874	idev = in6_dev_get(dev);
 875
 876	if (!idev)
 877		return -EINVAL;
 878
 879	write_lock_bh(&idev->lock);
 880	if (idev->dead) {
 881		write_unlock_bh(&idev->lock);
 882		in6_dev_put(idev);
 883		return -ENODEV;
 884	}
 885
 886	for (mc = idev->mc_list; mc; mc = mc->next) {
 887		if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 888			mc->mca_users++;
 889			write_unlock_bh(&idev->lock);
 890			ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0,
 891				NULL, 0);
 892			in6_dev_put(idev);
 893			return 0;
 894		}
 895	}
 896
 897	mc = mca_alloc(idev, addr);
 898	if (!mc) {
 899		write_unlock_bh(&idev->lock);
 900		in6_dev_put(idev);
 901		return -ENOMEM;
 902	}
 903
 904	mc->next = idev->mc_list;
 905	idev->mc_list = mc;
 906
 907	/* Hold this for the code below before we unlock,
 908	 * it is already exposed via idev->mc_list.
 909	 */
 910	mca_get(mc);
 911	write_unlock_bh(&idev->lock);
 912
 913	mld_del_delrec(idev, mc);
 914	igmp6_group_added(mc);
 915	ma_put(mc);
 916	return 0;
 917}
 918
 
 
 
 
 
 
 919/*
 920 *	device multicast group del
 921 */
 922int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 923{
 924	struct ifmcaddr6 *ma, **map;
 925
 926	ASSERT_RTNL();
 927
 928	write_lock_bh(&idev->lock);
 929	for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
 930		if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 931			if (--ma->mca_users == 0) {
 932				*map = ma->next;
 933				write_unlock_bh(&idev->lock);
 934
 935				igmp6_group_dropped(ma);
 936				ip6_mc_clear_src(ma);
 937
 938				ma_put(ma);
 939				return 0;
 940			}
 941			write_unlock_bh(&idev->lock);
 942			return 0;
 943		}
 944	}
 945	write_unlock_bh(&idev->lock);
 946
 947	return -ENOENT;
 948}
 949
 950int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 951{
 952	struct inet6_dev *idev;
 953	int err;
 954
 955	ASSERT_RTNL();
 956
 957	idev = __in6_dev_get(dev);
 958	if (!idev)
 959		err = -ENODEV;
 960	else
 961		err = __ipv6_dev_mc_dec(idev, addr);
 962
 963	return err;
 964}
 
 965
 966/*
 967 *	check if the interface/address pair is valid
 968 */
 969bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 970			 const struct in6_addr *src_addr)
 971{
 972	struct inet6_dev *idev;
 973	struct ifmcaddr6 *mc;
 974	bool rv = false;
 975
 976	rcu_read_lock();
 977	idev = __in6_dev_get(dev);
 978	if (idev) {
 979		read_lock_bh(&idev->lock);
 980		for (mc = idev->mc_list; mc; mc = mc->next) {
 981			if (ipv6_addr_equal(&mc->mca_addr, group))
 982				break;
 983		}
 984		if (mc) {
 985			if (src_addr && !ipv6_addr_any(src_addr)) {
 986				struct ip6_sf_list *psf;
 987
 988				spin_lock_bh(&mc->mca_lock);
 989				for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
 990					if (ipv6_addr_equal(&psf->sf_addr, src_addr))
 991						break;
 992				}
 993				if (psf)
 994					rv = psf->sf_count[MCAST_INCLUDE] ||
 995						psf->sf_count[MCAST_EXCLUDE] !=
 996						mc->mca_sfcount[MCAST_EXCLUDE];
 997				else
 998					rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
 999				spin_unlock_bh(&mc->mca_lock);
1000			} else
1001				rv = true; /* don't filter unspecified source */
1002		}
1003		read_unlock_bh(&idev->lock);
1004	}
1005	rcu_read_unlock();
1006	return rv;
1007}
1008
1009static void mld_gq_start_timer(struct inet6_dev *idev)
1010{
1011	unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1012
1013	idev->mc_gq_running = 1;
1014	if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1015		in6_dev_hold(idev);
1016}
1017
1018static void mld_gq_stop_timer(struct inet6_dev *idev)
1019{
1020	idev->mc_gq_running = 0;
1021	if (del_timer(&idev->mc_gq_timer))
1022		__in6_dev_put(idev);
1023}
1024
1025static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1026{
1027	unsigned long tv = prandom_u32() % delay;
1028
1029	if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1030		in6_dev_hold(idev);
1031}
1032
1033static void mld_ifc_stop_timer(struct inet6_dev *idev)
1034{
1035	idev->mc_ifc_count = 0;
1036	if (del_timer(&idev->mc_ifc_timer))
1037		__in6_dev_put(idev);
1038}
1039
1040static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1041{
1042	unsigned long tv = prandom_u32() % delay;
1043
1044	if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1045		in6_dev_hold(idev);
1046}
1047
1048static void mld_dad_stop_timer(struct inet6_dev *idev)
1049{
1050	if (del_timer(&idev->mc_dad_timer))
1051		__in6_dev_put(idev);
1052}
1053
1054/*
1055 *	IGMP handling (alias multicast ICMPv6 messages)
1056 */
1057
1058static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1059{
1060	unsigned long delay = resptime;
1061
1062	/* Do not start timer for these addresses */
1063	if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1064	    IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1065		return;
1066
1067	if (del_timer(&ma->mca_timer)) {
1068		refcount_dec(&ma->mca_refcnt);
1069		delay = ma->mca_timer.expires - jiffies;
1070	}
1071
1072	if (delay >= resptime)
1073		delay = prandom_u32() % resptime;
1074
1075	ma->mca_timer.expires = jiffies + delay;
1076	if (!mod_timer(&ma->mca_timer, jiffies + delay))
1077		refcount_inc(&ma->mca_refcnt);
1078	ma->mca_flags |= MAF_TIMER_RUNNING;
1079}
1080
1081/* mark EXCLUDE-mode sources */
1082static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1083			     const struct in6_addr *srcs)
1084{
1085	struct ip6_sf_list *psf;
1086	int i, scount;
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			/* skip inactive filters */
1094			if (psf->sf_count[MCAST_INCLUDE] ||
1095			    pmc->mca_sfcount[MCAST_EXCLUDE] !=
1096			    psf->sf_count[MCAST_EXCLUDE])
1097				break;
1098			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1099				scount++;
1100				break;
1101			}
1102		}
1103	}
1104	pmc->mca_flags &= ~MAF_GSQUERY;
1105	if (scount == nsrcs)	/* all sources excluded */
1106		return false;
1107	return true;
1108}
1109
1110static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1111			    const struct in6_addr *srcs)
1112{
1113	struct ip6_sf_list *psf;
1114	int i, scount;
1115
1116	if (pmc->mca_sfmode == MCAST_EXCLUDE)
1117		return mld_xmarksources(pmc, nsrcs, srcs);
1118
1119	/* mark INCLUDE-mode sources */
1120
1121	scount = 0;
1122	for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1123		if (scount == nsrcs)
1124			break;
1125		for (i = 0; i < nsrcs; i++) {
1126			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1127				psf->sf_gsresp = 1;
1128				scount++;
1129				break;
1130			}
1131		}
1132	}
1133	if (!scount) {
1134		pmc->mca_flags &= ~MAF_GSQUERY;
1135		return false;
1136	}
1137	pmc->mca_flags |= MAF_GSQUERY;
1138	return true;
1139}
1140
1141static int mld_force_mld_version(const struct inet6_dev *idev)
1142{
1143	/* Normally, both are 0 here. If enforcement to a particular is
1144	 * being used, individual device enforcement will have a lower
1145	 * precedence over 'all' device (.../conf/all/force_mld_version).
1146	 */
1147
1148	if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1149		return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1150	else
1151		return idev->cnf.force_mld_version;
1152}
1153
1154static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1155{
1156	return mld_force_mld_version(idev) == 2;
1157}
1158
1159static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1160{
1161	return mld_force_mld_version(idev) == 1;
1162}
1163
1164static bool mld_in_v1_mode(const struct inet6_dev *idev)
1165{
1166	if (mld_in_v2_mode_only(idev))
1167		return false;
1168	if (mld_in_v1_mode_only(idev))
1169		return true;
1170	if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1171		return true;
1172
1173	return false;
1174}
1175
1176static void mld_set_v1_mode(struct inet6_dev *idev)
1177{
1178	/* RFC3810, relevant sections:
1179	 *  - 9.1. Robustness Variable
1180	 *  - 9.2. Query Interval
1181	 *  - 9.3. Query Response Interval
1182	 *  - 9.12. Older Version Querier Present Timeout
1183	 */
1184	unsigned long switchback;
1185
1186	switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1187
1188	idev->mc_v1_seen = jiffies + switchback;
1189}
1190
1191static void mld_update_qrv(struct inet6_dev *idev,
1192			   const struct mld2_query *mlh2)
1193{
1194	/* RFC3810, relevant sections:
1195	 *  - 5.1.8. QRV (Querier's Robustness Variable)
1196	 *  - 9.1. Robustness Variable
1197	 */
1198
1199	/* The value of the Robustness Variable MUST NOT be zero,
1200	 * and SHOULD NOT be one. Catch this here if we ever run
1201	 * into such a case in future.
1202	 */
1203	const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1204	WARN_ON(idev->mc_qrv == 0);
1205
1206	if (mlh2->mld2q_qrv > 0)
1207		idev->mc_qrv = mlh2->mld2q_qrv;
1208
1209	if (unlikely(idev->mc_qrv < min_qrv)) {
1210		net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1211				     idev->mc_qrv, min_qrv);
1212		idev->mc_qrv = min_qrv;
1213	}
1214}
1215
1216static void mld_update_qi(struct inet6_dev *idev,
1217			  const struct mld2_query *mlh2)
1218{
1219	/* RFC3810, relevant sections:
1220	 *  - 5.1.9. QQIC (Querier's Query Interval Code)
1221	 *  - 9.2. Query Interval
1222	 *  - 9.12. Older Version Querier Present Timeout
1223	 *    (the [Query Interval] in the last Query received)
1224	 */
1225	unsigned long mc_qqi;
1226
1227	if (mlh2->mld2q_qqic < 128) {
1228		mc_qqi = mlh2->mld2q_qqic;
1229	} else {
1230		unsigned long mc_man, mc_exp;
1231
1232		mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1233		mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1234
1235		mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1236	}
1237
1238	idev->mc_qi = mc_qqi * HZ;
1239}
1240
1241static void mld_update_qri(struct inet6_dev *idev,
1242			   const struct mld2_query *mlh2)
1243{
1244	/* RFC3810, relevant sections:
1245	 *  - 5.1.3. Maximum Response Code
1246	 *  - 9.3. Query Response Interval
1247	 */
1248	idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1249}
1250
1251static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1252			  unsigned long *max_delay, bool v1_query)
1253{
1254	unsigned long mldv1_md;
1255
1256	/* Ignore v1 queries */
1257	if (mld_in_v2_mode_only(idev))
1258		return -EINVAL;
1259
1260	mldv1_md = ntohs(mld->mld_maxdelay);
1261
1262	/* When in MLDv1 fallback and a MLDv2 router start-up being
1263	 * unaware of current MLDv1 operation, the MRC == MRD mapping
1264	 * only works when the exponential algorithm is not being
1265	 * used (as MLDv1 is unaware of such things).
1266	 *
1267	 * According to the RFC author, the MLDv2 implementations
1268	 * he's aware of all use a MRC < 32768 on start up queries.
1269	 *
1270	 * Thus, should we *ever* encounter something else larger
1271	 * than that, just assume the maximum possible within our
1272	 * reach.
1273	 */
1274	if (!v1_query)
1275		mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1276
1277	*max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1278
1279	/* MLDv1 router present: we need to go into v1 mode *only*
1280	 * when an MLDv1 query is received as per section 9.12. of
1281	 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1282	 * queries MUST be of exactly 24 octets.
1283	 */
1284	if (v1_query)
1285		mld_set_v1_mode(idev);
1286
1287	/* cancel MLDv2 report timer */
1288	mld_gq_stop_timer(idev);
1289	/* cancel the interface change timer */
1290	mld_ifc_stop_timer(idev);
1291	/* clear deleted report items */
1292	mld_clear_delrec(idev);
1293
1294	return 0;
1295}
1296
1297static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1298			  unsigned long *max_delay)
1299{
1300	*max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1301
1302	mld_update_qrv(idev, mld);
1303	mld_update_qi(idev, mld);
1304	mld_update_qri(idev, mld);
1305
1306	idev->mc_maxdelay = *max_delay;
1307
1308	return 0;
1309}
1310
1311/* called with rcu_read_lock() */
1312int igmp6_event_query(struct sk_buff *skb)
1313{
1314	struct mld2_query *mlh2 = NULL;
1315	struct ifmcaddr6 *ma;
1316	const struct in6_addr *group;
1317	unsigned long max_delay;
1318	struct inet6_dev *idev;
1319	struct mld_msg *mld;
1320	int group_type;
1321	int mark = 0;
1322	int len, err;
1323
1324	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1325		return -EINVAL;
1326
1327	/* compute payload length excluding extension headers */
1328	len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1329	len -= skb_network_header_len(skb);
1330
1331	/* RFC3810 6.2
1332	 * Upon reception of an MLD message that contains a Query, the node
1333	 * checks if the source address of the message is a valid link-local
1334	 * address, if the Hop Limit is set to 1, and if the Router Alert
1335	 * option is present in the Hop-By-Hop Options header of the IPv6
1336	 * packet.  If any of these checks fails, the packet is dropped.
1337	 */
1338	if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1339	    ipv6_hdr(skb)->hop_limit != 1 ||
1340	    !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1341	    IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1342		return -EINVAL;
1343
1344	idev = __in6_dev_get(skb->dev);
1345	if (!idev)
1346		return 0;
1347
1348	mld = (struct mld_msg *)icmp6_hdr(skb);
1349	group = &mld->mld_mca;
1350	group_type = ipv6_addr_type(group);
1351
1352	if (group_type != IPV6_ADDR_ANY &&
1353	    !(group_type&IPV6_ADDR_MULTICAST))
1354		return -EINVAL;
1355
1356	if (len < MLD_V1_QUERY_LEN) {
1357		return -EINVAL;
1358	} else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1359		err = mld_process_v1(idev, mld, &max_delay,
1360				     len == MLD_V1_QUERY_LEN);
1361		if (err < 0)
1362			return err;
1363	} else if (len >= MLD_V2_QUERY_LEN_MIN) {
1364		int srcs_offset = sizeof(struct mld2_query) -
1365				  sizeof(struct icmp6hdr);
1366
1367		if (!pskb_may_pull(skb, srcs_offset))
1368			return -EINVAL;
1369
1370		mlh2 = (struct mld2_query *)skb_transport_header(skb);
1371
1372		err = mld_process_v2(idev, mlh2, &max_delay);
1373		if (err < 0)
1374			return err;
1375
1376		if (group_type == IPV6_ADDR_ANY) { /* general query */
1377			if (mlh2->mld2q_nsrcs)
1378				return -EINVAL; /* no sources allowed */
1379
1380			mld_gq_start_timer(idev);
1381			return 0;
1382		}
1383		/* mark sources to include, if group & source-specific */
1384		if (mlh2->mld2q_nsrcs != 0) {
1385			if (!pskb_may_pull(skb, srcs_offset +
1386			    ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1387				return -EINVAL;
1388
1389			mlh2 = (struct mld2_query *)skb_transport_header(skb);
1390			mark = 1;
1391		}
1392	} else {
1393		return -EINVAL;
1394	}
1395
1396	read_lock_bh(&idev->lock);
1397	if (group_type == IPV6_ADDR_ANY) {
1398		for (ma = idev->mc_list; ma; ma = ma->next) {
1399			spin_lock_bh(&ma->mca_lock);
1400			igmp6_group_queried(ma, max_delay);
1401			spin_unlock_bh(&ma->mca_lock);
1402		}
1403	} else {
1404		for (ma = idev->mc_list; ma; ma = ma->next) {
1405			if (!ipv6_addr_equal(group, &ma->mca_addr))
1406				continue;
1407			spin_lock_bh(&ma->mca_lock);
1408			if (ma->mca_flags & MAF_TIMER_RUNNING) {
1409				/* gsquery <- gsquery && mark */
1410				if (!mark)
1411					ma->mca_flags &= ~MAF_GSQUERY;
1412			} else {
1413				/* gsquery <- mark */
1414				if (mark)
1415					ma->mca_flags |= MAF_GSQUERY;
1416				else
1417					ma->mca_flags &= ~MAF_GSQUERY;
1418			}
1419			if (!(ma->mca_flags & MAF_GSQUERY) ||
1420			    mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1421				igmp6_group_queried(ma, max_delay);
1422			spin_unlock_bh(&ma->mca_lock);
1423			break;
1424		}
1425	}
1426	read_unlock_bh(&idev->lock);
1427
1428	return 0;
1429}
1430
1431/* called with rcu_read_lock() */
1432int igmp6_event_report(struct sk_buff *skb)
1433{
1434	struct ifmcaddr6 *ma;
1435	struct inet6_dev *idev;
1436	struct mld_msg *mld;
1437	int addr_type;
1438
1439	/* Our own report looped back. Ignore it. */
1440	if (skb->pkt_type == PACKET_LOOPBACK)
1441		return 0;
1442
1443	/* send our report if the MC router may not have heard this report */
1444	if (skb->pkt_type != PACKET_MULTICAST &&
1445	    skb->pkt_type != PACKET_BROADCAST)
1446		return 0;
1447
1448	if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1449		return -EINVAL;
1450
1451	mld = (struct mld_msg *)icmp6_hdr(skb);
1452
1453	/* Drop reports with not link local source */
1454	addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1455	if (addr_type != IPV6_ADDR_ANY &&
1456	    !(addr_type&IPV6_ADDR_LINKLOCAL))
1457		return -EINVAL;
1458
1459	idev = __in6_dev_get(skb->dev);
1460	if (!idev)
1461		return -ENODEV;
1462
1463	/*
1464	 *	Cancel the timer for this group
1465	 */
1466
1467	read_lock_bh(&idev->lock);
1468	for (ma = idev->mc_list; ma; ma = ma->next) {
1469		if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1470			spin_lock(&ma->mca_lock);
1471			if (del_timer(&ma->mca_timer))
1472				refcount_dec(&ma->mca_refcnt);
1473			ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1474			spin_unlock(&ma->mca_lock);
1475			break;
1476		}
1477	}
1478	read_unlock_bh(&idev->lock);
1479	return 0;
1480}
1481
1482static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1483		  int gdeleted, int sdeleted)
1484{
1485	switch (type) {
1486	case MLD2_MODE_IS_INCLUDE:
1487	case MLD2_MODE_IS_EXCLUDE:
1488		if (gdeleted || sdeleted)
1489			return false;
1490		if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1491			if (pmc->mca_sfmode == MCAST_INCLUDE)
1492				return true;
1493			/* don't include if this source is excluded
1494			 * in all filters
1495			 */
1496			if (psf->sf_count[MCAST_INCLUDE])
1497				return type == MLD2_MODE_IS_INCLUDE;
1498			return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1499				psf->sf_count[MCAST_EXCLUDE];
1500		}
1501		return false;
1502	case MLD2_CHANGE_TO_INCLUDE:
1503		if (gdeleted || sdeleted)
1504			return false;
1505		return psf->sf_count[MCAST_INCLUDE] != 0;
1506	case MLD2_CHANGE_TO_EXCLUDE:
1507		if (gdeleted || sdeleted)
1508			return false;
1509		if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1510		    psf->sf_count[MCAST_INCLUDE])
1511			return false;
1512		return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1513			psf->sf_count[MCAST_EXCLUDE];
1514	case MLD2_ALLOW_NEW_SOURCES:
1515		if (gdeleted || !psf->sf_crcount)
1516			return false;
1517		return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1518	case MLD2_BLOCK_OLD_SOURCES:
1519		if (pmc->mca_sfmode == MCAST_INCLUDE)
1520			return gdeleted || (psf->sf_crcount && sdeleted);
1521		return psf->sf_crcount && !gdeleted && !sdeleted;
1522	}
1523	return false;
1524}
1525
1526static int
1527mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1528{
1529	struct ip6_sf_list *psf;
1530	int scount = 0;
1531
1532	for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1533		if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1534			continue;
1535		scount++;
1536	}
1537	return scount;
1538}
1539
1540static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1541		       struct net_device *dev,
1542		       const struct in6_addr *saddr,
1543		       const struct in6_addr *daddr,
1544		       int proto, int len)
1545{
1546	struct ipv6hdr *hdr;
1547
1548	skb->protocol = htons(ETH_P_IPV6);
1549	skb->dev = dev;
1550
1551	skb_reset_network_header(skb);
1552	skb_put(skb, sizeof(struct ipv6hdr));
1553	hdr = ipv6_hdr(skb);
1554
1555	ip6_flow_hdr(hdr, 0, 0);
1556
1557	hdr->payload_len = htons(len);
1558	hdr->nexthdr = proto;
1559	hdr->hop_limit = inet6_sk(sk)->hop_limit;
1560
1561	hdr->saddr = *saddr;
1562	hdr->daddr = *daddr;
1563}
1564
1565static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1566{
1567	struct net_device *dev = idev->dev;
1568	struct net *net = dev_net(dev);
1569	struct sock *sk = net->ipv6.igmp_sk;
1570	struct sk_buff *skb;
1571	struct mld2_report *pmr;
1572	struct in6_addr addr_buf;
1573	const struct in6_addr *saddr;
1574	int hlen = LL_RESERVED_SPACE(dev);
1575	int tlen = dev->needed_tailroom;
1576	unsigned int size = mtu + hlen + tlen;
1577	int err;
1578	u8 ra[8] = { IPPROTO_ICMPV6, 0,
1579		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1580		     IPV6_TLV_PADN, 0 };
1581
1582	/* we assume size > sizeof(ra) here */
1583	/* limit our allocations to order-0 page */
1584	size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1585	skb = sock_alloc_send_skb(sk, size, 1, &err);
1586
1587	if (!skb)
1588		return NULL;
1589
1590	skb->priority = TC_PRIO_CONTROL;
1591	skb_reserve(skb, hlen);
1592	skb_tailroom_reserve(skb, mtu, tlen);
1593
1594	if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1595		/* <draft-ietf-magma-mld-source-05.txt>:
1596		 * use unspecified address as the source address
1597		 * when a valid link-local address is not available.
1598		 */
1599		saddr = &in6addr_any;
1600	} else
1601		saddr = &addr_buf;
1602
1603	ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1604
1605	skb_put_data(skb, ra, sizeof(ra));
1606
1607	skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1608	skb_put(skb, sizeof(*pmr));
1609	pmr = (struct mld2_report *)skb_transport_header(skb);
1610	pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1611	pmr->mld2r_resv1 = 0;
1612	pmr->mld2r_cksum = 0;
1613	pmr->mld2r_resv2 = 0;
1614	pmr->mld2r_ngrec = 0;
1615	return skb;
1616}
1617
1618static void mld_sendpack(struct sk_buff *skb)
1619{
1620	struct ipv6hdr *pip6 = ipv6_hdr(skb);
1621	struct mld2_report *pmr =
1622			      (struct mld2_report *)skb_transport_header(skb);
1623	int payload_len, mldlen;
1624	struct inet6_dev *idev;
1625	struct net *net = dev_net(skb->dev);
1626	int err;
1627	struct flowi6 fl6;
1628	struct dst_entry *dst;
1629
1630	rcu_read_lock();
1631	idev = __in6_dev_get(skb->dev);
1632	IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1633
1634	payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1635		sizeof(*pip6);
1636	mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1637	pip6->payload_len = htons(payload_len);
1638
1639	pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1640					   IPPROTO_ICMPV6,
1641					   csum_partial(skb_transport_header(skb),
1642							mldlen, 0));
1643
1644	icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1645			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1646			 skb->dev->ifindex);
1647	dst = icmp6_dst_alloc(skb->dev, &fl6);
1648
1649	err = 0;
1650	if (IS_ERR(dst)) {
1651		err = PTR_ERR(dst);
1652		dst = NULL;
1653	}
1654	skb_dst_set(skb, dst);
1655	if (err)
1656		goto err_out;
1657
1658	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1659		      net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1660		      dst_output);
1661out:
1662	if (!err) {
1663		ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1664		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1665	} else {
1666		IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1667	}
1668
1669	rcu_read_unlock();
1670	return;
1671
1672err_out:
1673	kfree_skb(skb);
1674	goto out;
1675}
1676
1677static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1678{
1679	return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1680}
1681
1682static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1683	int type, struct mld2_grec **ppgr, unsigned int mtu)
1684{
1685	struct mld2_report *pmr;
1686	struct mld2_grec *pgr;
1687
1688	if (!skb) {
1689		skb = mld_newpack(pmc->idev, mtu);
1690		if (!skb)
1691			return NULL;
1692	}
1693	pgr = skb_put(skb, sizeof(struct mld2_grec));
1694	pgr->grec_type = type;
1695	pgr->grec_auxwords = 0;
1696	pgr->grec_nsrcs = 0;
1697	pgr->grec_mca = pmc->mca_addr;	/* structure copy */
1698	pmr = (struct mld2_report *)skb_transport_header(skb);
1699	pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1700	*ppgr = pgr;
1701	return skb;
1702}
1703
1704#define AVAILABLE(skb)	((skb) ? skb_availroom(skb) : 0)
1705
1706static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1707	int type, int gdeleted, int sdeleted, int crsend)
1708{
1709	struct inet6_dev *idev = pmc->idev;
1710	struct net_device *dev = idev->dev;
1711	struct mld2_report *pmr;
1712	struct mld2_grec *pgr = NULL;
1713	struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1714	int scount, stotal, first, isquery, truncate;
1715	unsigned int mtu;
1716
1717	if (pmc->mca_flags & MAF_NOREPORT)
1718		return skb;
1719
1720	mtu = READ_ONCE(dev->mtu);
1721	if (mtu < IPV6_MIN_MTU)
1722		return skb;
1723
1724	isquery = type == MLD2_MODE_IS_INCLUDE ||
1725		  type == MLD2_MODE_IS_EXCLUDE;
1726	truncate = type == MLD2_MODE_IS_EXCLUDE ||
1727		    type == MLD2_CHANGE_TO_EXCLUDE;
1728
1729	stotal = scount = 0;
1730
1731	psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1732
1733	if (!*psf_list)
1734		goto empty_source;
1735
1736	pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1737
1738	/* EX and TO_EX get a fresh packet, if needed */
1739	if (truncate) {
1740		if (pmr && pmr->mld2r_ngrec &&
1741		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1742			if (skb)
1743				mld_sendpack(skb);
1744			skb = mld_newpack(idev, mtu);
1745		}
1746	}
1747	first = 1;
1748	psf_prev = NULL;
1749	for (psf = *psf_list; psf; psf = psf_next) {
1750		struct in6_addr *psrc;
1751
1752		psf_next = psf->sf_next;
1753
1754		if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
1755			psf_prev = psf;
1756			continue;
1757		}
1758
1759		/* Based on RFC3810 6.1. Should not send source-list change
1760		 * records when there is a filter mode change.
1761		 */
1762		if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1763		     (!gdeleted && pmc->mca_crcount)) &&
1764		    (type == MLD2_ALLOW_NEW_SOURCES ||
1765		     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1766			goto decrease_sf_crcount;
1767
1768		/* clear marks on query responses */
1769		if (isquery)
1770			psf->sf_gsresp = 0;
1771
1772		if (AVAILABLE(skb) < sizeof(*psrc) +
1773		    first*sizeof(struct mld2_grec)) {
1774			if (truncate && !first)
1775				break;	 /* truncate these */
1776			if (pgr)
1777				pgr->grec_nsrcs = htons(scount);
1778			if (skb)
1779				mld_sendpack(skb);
1780			skb = mld_newpack(idev, mtu);
1781			first = 1;
1782			scount = 0;
1783		}
1784		if (first) {
1785			skb = add_grhead(skb, pmc, type, &pgr, mtu);
1786			first = 0;
1787		}
1788		if (!skb)
1789			return NULL;
1790		psrc = skb_put(skb, sizeof(*psrc));
1791		*psrc = psf->sf_addr;
1792		scount++; stotal++;
1793		if ((type == MLD2_ALLOW_NEW_SOURCES ||
1794		     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1795decrease_sf_crcount:
1796			psf->sf_crcount--;
1797			if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1798				if (psf_prev)
1799					psf_prev->sf_next = psf->sf_next;
1800				else
1801					*psf_list = psf->sf_next;
1802				kfree(psf);
1803				continue;
1804			}
1805		}
1806		psf_prev = psf;
1807	}
1808
1809empty_source:
1810	if (!stotal) {
1811		if (type == MLD2_ALLOW_NEW_SOURCES ||
1812		    type == MLD2_BLOCK_OLD_SOURCES)
1813			return skb;
1814		if (pmc->mca_crcount || isquery || crsend) {
1815			/* make sure we have room for group header */
1816			if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1817				mld_sendpack(skb);
1818				skb = NULL; /* add_grhead will get a new one */
1819			}
1820			skb = add_grhead(skb, pmc, type, &pgr, mtu);
1821		}
1822	}
1823	if (pgr)
1824		pgr->grec_nsrcs = htons(scount);
1825
1826	if (isquery)
1827		pmc->mca_flags &= ~MAF_GSQUERY;	/* clear query state */
1828	return skb;
1829}
1830
1831static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1832{
1833	struct sk_buff *skb = NULL;
1834	int type;
1835
1836	read_lock_bh(&idev->lock);
1837	if (!pmc) {
1838		for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1839			if (pmc->mca_flags & MAF_NOREPORT)
1840				continue;
1841			spin_lock_bh(&pmc->mca_lock);
1842			if (pmc->mca_sfcount[MCAST_EXCLUDE])
1843				type = MLD2_MODE_IS_EXCLUDE;
1844			else
1845				type = MLD2_MODE_IS_INCLUDE;
1846			skb = add_grec(skb, pmc, type, 0, 0, 0);
1847			spin_unlock_bh(&pmc->mca_lock);
1848		}
1849	} else {
1850		spin_lock_bh(&pmc->mca_lock);
1851		if (pmc->mca_sfcount[MCAST_EXCLUDE])
1852			type = MLD2_MODE_IS_EXCLUDE;
1853		else
1854			type = MLD2_MODE_IS_INCLUDE;
1855		skb = add_grec(skb, pmc, type, 0, 0, 0);
1856		spin_unlock_bh(&pmc->mca_lock);
1857	}
1858	read_unlock_bh(&idev->lock);
1859	if (skb)
1860		mld_sendpack(skb);
1861}
1862
1863/*
1864 * remove zero-count source records from a source filter list
1865 */
1866static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1867{
1868	struct ip6_sf_list *psf_prev, *psf_next, *psf;
1869
1870	psf_prev = NULL;
1871	for (psf = *ppsf; psf; psf = psf_next) {
1872		psf_next = psf->sf_next;
1873		if (psf->sf_crcount == 0) {
1874			if (psf_prev)
1875				psf_prev->sf_next = psf->sf_next;
1876			else
1877				*ppsf = psf->sf_next;
1878			kfree(psf);
1879		} else
1880			psf_prev = psf;
1881	}
1882}
1883
1884static void mld_send_cr(struct inet6_dev *idev)
1885{
1886	struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1887	struct sk_buff *skb = NULL;
1888	int type, dtype;
1889
1890	read_lock_bh(&idev->lock);
1891	spin_lock(&idev->mc_lock);
1892
1893	/* deleted MCA's */
1894	pmc_prev = NULL;
1895	for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1896		pmc_next = pmc->next;
1897		if (pmc->mca_sfmode == MCAST_INCLUDE) {
1898			type = MLD2_BLOCK_OLD_SOURCES;
1899			dtype = MLD2_BLOCK_OLD_SOURCES;
1900			skb = add_grec(skb, pmc, type, 1, 0, 0);
1901			skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1902		}
1903		if (pmc->mca_crcount) {
1904			if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1905				type = MLD2_CHANGE_TO_INCLUDE;
1906				skb = add_grec(skb, pmc, type, 1, 0, 0);
1907			}
1908			pmc->mca_crcount--;
1909			if (pmc->mca_crcount == 0) {
1910				mld_clear_zeros(&pmc->mca_tomb);
1911				mld_clear_zeros(&pmc->mca_sources);
1912			}
1913		}
1914		if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1915		    !pmc->mca_sources) {
1916			if (pmc_prev)
1917				pmc_prev->next = pmc_next;
1918			else
1919				idev->mc_tomb = pmc_next;
1920			in6_dev_put(pmc->idev);
1921			kfree(pmc);
1922		} else
1923			pmc_prev = pmc;
1924	}
1925	spin_unlock(&idev->mc_lock);
1926
1927	/* change recs */
1928	for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1929		spin_lock_bh(&pmc->mca_lock);
1930		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1931			type = MLD2_BLOCK_OLD_SOURCES;
1932			dtype = MLD2_ALLOW_NEW_SOURCES;
1933		} else {
1934			type = MLD2_ALLOW_NEW_SOURCES;
1935			dtype = MLD2_BLOCK_OLD_SOURCES;
1936		}
1937		skb = add_grec(skb, pmc, type, 0, 0, 0);
1938		skb = add_grec(skb, pmc, dtype, 0, 1, 0);	/* deleted sources */
1939
1940		/* filter mode changes */
1941		if (pmc->mca_crcount) {
1942			if (pmc->mca_sfmode == MCAST_EXCLUDE)
1943				type = MLD2_CHANGE_TO_EXCLUDE;
1944			else
1945				type = MLD2_CHANGE_TO_INCLUDE;
1946			skb = add_grec(skb, pmc, type, 0, 0, 0);
1947			pmc->mca_crcount--;
1948		}
1949		spin_unlock_bh(&pmc->mca_lock);
1950	}
1951	read_unlock_bh(&idev->lock);
1952	if (!skb)
1953		return;
1954	(void) mld_sendpack(skb);
1955}
1956
1957static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1958{
1959	struct net *net = dev_net(dev);
1960	struct sock *sk = net->ipv6.igmp_sk;
1961	struct inet6_dev *idev;
1962	struct sk_buff *skb;
1963	struct mld_msg *hdr;
1964	const struct in6_addr *snd_addr, *saddr;
1965	struct in6_addr addr_buf;
1966	int hlen = LL_RESERVED_SPACE(dev);
1967	int tlen = dev->needed_tailroom;
1968	int err, len, payload_len, full_len;
1969	u8 ra[8] = { IPPROTO_ICMPV6, 0,
1970		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1971		     IPV6_TLV_PADN, 0 };
1972	struct flowi6 fl6;
1973	struct dst_entry *dst;
1974
1975	if (type == ICMPV6_MGM_REDUCTION)
1976		snd_addr = &in6addr_linklocal_allrouters;
1977	else
1978		snd_addr = addr;
1979
1980	len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
1981	payload_len = len + sizeof(ra);
1982	full_len = sizeof(struct ipv6hdr) + payload_len;
1983
1984	rcu_read_lock();
1985	IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
1986		      IPSTATS_MIB_OUT, full_len);
1987	rcu_read_unlock();
1988
1989	skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
1990
1991	if (!skb) {
1992		rcu_read_lock();
1993		IP6_INC_STATS(net, __in6_dev_get(dev),
1994			      IPSTATS_MIB_OUTDISCARDS);
1995		rcu_read_unlock();
1996		return;
1997	}
1998	skb->priority = TC_PRIO_CONTROL;
1999	skb_reserve(skb, hlen);
2000
2001	if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2002		/* <draft-ietf-magma-mld-source-05.txt>:
2003		 * use unspecified address as the source address
2004		 * when a valid link-local address is not available.
2005		 */
2006		saddr = &in6addr_any;
2007	} else
2008		saddr = &addr_buf;
2009
2010	ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2011
2012	skb_put_data(skb, ra, sizeof(ra));
2013
2014	hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2015	hdr->mld_type = type;
2016	hdr->mld_mca = *addr;
2017
2018	hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2019					 IPPROTO_ICMPV6,
2020					 csum_partial(hdr, len, 0));
2021
2022	rcu_read_lock();
2023	idev = __in6_dev_get(skb->dev);
2024
2025	icmpv6_flow_init(sk, &fl6, type,
2026			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2027			 skb->dev->ifindex);
2028	dst = icmp6_dst_alloc(skb->dev, &fl6);
2029	if (IS_ERR(dst)) {
2030		err = PTR_ERR(dst);
2031		goto err_out;
2032	}
2033
2034	skb_dst_set(skb, dst);
2035	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2036		      net, sk, skb, NULL, skb->dev,
2037		      dst_output);
2038out:
2039	if (!err) {
2040		ICMP6MSGOUT_INC_STATS(net, idev, type);
2041		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2042	} else
2043		IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2044
2045	rcu_read_unlock();
2046	return;
2047
2048err_out:
2049	kfree_skb(skb);
2050	goto out;
2051}
2052
2053static void mld_send_initial_cr(struct inet6_dev *idev)
2054{
2055	struct sk_buff *skb;
2056	struct ifmcaddr6 *pmc;
2057	int type;
2058
2059	if (mld_in_v1_mode(idev))
2060		return;
2061
2062	skb = NULL;
2063	read_lock_bh(&idev->lock);
2064	for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2065		spin_lock_bh(&pmc->mca_lock);
2066		if (pmc->mca_sfcount[MCAST_EXCLUDE])
2067			type = MLD2_CHANGE_TO_EXCLUDE;
2068		else
2069			type = MLD2_CHANGE_TO_INCLUDE;
2070		skb = add_grec(skb, pmc, type, 0, 0, 1);
2071		spin_unlock_bh(&pmc->mca_lock);
2072	}
2073	read_unlock_bh(&idev->lock);
2074	if (skb)
2075		mld_sendpack(skb);
2076}
2077
2078void ipv6_mc_dad_complete(struct inet6_dev *idev)
2079{
2080	idev->mc_dad_count = idev->mc_qrv;
2081	if (idev->mc_dad_count) {
2082		mld_send_initial_cr(idev);
2083		idev->mc_dad_count--;
2084		if (idev->mc_dad_count)
2085			mld_dad_start_timer(idev, idev->mc_maxdelay);
 
2086	}
2087}
2088
2089static void mld_dad_timer_expire(struct timer_list *t)
2090{
2091	struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer);
2092
2093	mld_send_initial_cr(idev);
2094	if (idev->mc_dad_count) {
2095		idev->mc_dad_count--;
2096		if (idev->mc_dad_count)
2097			mld_dad_start_timer(idev, idev->mc_maxdelay);
 
2098	}
2099	in6_dev_put(idev);
2100}
2101
2102static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2103	const struct in6_addr *psfsrc)
2104{
2105	struct ip6_sf_list *psf, *psf_prev;
2106	int rv = 0;
2107
2108	psf_prev = NULL;
2109	for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2110		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2111			break;
2112		psf_prev = psf;
2113	}
2114	if (!psf || psf->sf_count[sfmode] == 0) {
2115		/* source filter not found, or count wrong =>  bug */
2116		return -ESRCH;
2117	}
2118	psf->sf_count[sfmode]--;
2119	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2120		struct inet6_dev *idev = pmc->idev;
2121
2122		/* no more filters for this source */
2123		if (psf_prev)
2124			psf_prev->sf_next = psf->sf_next;
2125		else
2126			pmc->mca_sources = psf->sf_next;
2127		if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2128		    !mld_in_v1_mode(idev)) {
2129			psf->sf_crcount = idev->mc_qrv;
2130			psf->sf_next = pmc->mca_tomb;
2131			pmc->mca_tomb = psf;
2132			rv = 1;
2133		} else
2134			kfree(psf);
2135	}
2136	return rv;
2137}
2138
2139static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2140			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
2141			  int delta)
2142{
2143	struct ifmcaddr6 *pmc;
2144	int	changerec = 0;
2145	int	i, err;
2146
2147	if (!idev)
2148		return -ENODEV;
2149	read_lock_bh(&idev->lock);
2150	for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2151		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2152			break;
2153	}
2154	if (!pmc) {
2155		/* MCA not found?? bug */
2156		read_unlock_bh(&idev->lock);
2157		return -ESRCH;
2158	}
2159	spin_lock_bh(&pmc->mca_lock);
2160	sf_markstate(pmc);
2161	if (!delta) {
2162		if (!pmc->mca_sfcount[sfmode]) {
2163			spin_unlock_bh(&pmc->mca_lock);
2164			read_unlock_bh(&idev->lock);
2165			return -EINVAL;
2166		}
2167		pmc->mca_sfcount[sfmode]--;
2168	}
2169	err = 0;
2170	for (i = 0; i < sfcount; i++) {
2171		int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2172
2173		changerec |= rv > 0;
2174		if (!err && rv < 0)
2175			err = rv;
2176	}
2177	if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2178	    pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2179	    pmc->mca_sfcount[MCAST_INCLUDE]) {
2180		struct ip6_sf_list *psf;
2181
2182		/* filter mode change */
2183		pmc->mca_sfmode = MCAST_INCLUDE;
2184		pmc->mca_crcount = idev->mc_qrv;
2185		idev->mc_ifc_count = pmc->mca_crcount;
2186		for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2187			psf->sf_crcount = 0;
2188		mld_ifc_event(pmc->idev);
2189	} else if (sf_setstate(pmc) || changerec)
2190		mld_ifc_event(pmc->idev);
2191	spin_unlock_bh(&pmc->mca_lock);
2192	read_unlock_bh(&idev->lock);
2193	return err;
2194}
2195
2196/*
2197 * Add multicast single-source filter to the interface list
2198 */
2199static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2200	const struct in6_addr *psfsrc)
2201{
2202	struct ip6_sf_list *psf, *psf_prev;
2203
2204	psf_prev = NULL;
2205	for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2206		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2207			break;
2208		psf_prev = psf;
2209	}
2210	if (!psf) {
2211		psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2212		if (!psf)
2213			return -ENOBUFS;
2214
2215		psf->sf_addr = *psfsrc;
2216		if (psf_prev) {
2217			psf_prev->sf_next = psf;
2218		} else
2219			pmc->mca_sources = psf;
2220	}
2221	psf->sf_count[sfmode]++;
2222	return 0;
2223}
2224
2225static void sf_markstate(struct ifmcaddr6 *pmc)
2226{
2227	struct ip6_sf_list *psf;
2228	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2229
2230	for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2231		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2232			psf->sf_oldin = mca_xcount ==
2233				psf->sf_count[MCAST_EXCLUDE] &&
2234				!psf->sf_count[MCAST_INCLUDE];
2235		} else
2236			psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2237}
2238
2239static int sf_setstate(struct ifmcaddr6 *pmc)
2240{
2241	struct ip6_sf_list *psf, *dpsf;
2242	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2243	int qrv = pmc->idev->mc_qrv;
2244	int new_in, rv;
2245
2246	rv = 0;
2247	for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2248		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2249			new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2250				!psf->sf_count[MCAST_INCLUDE];
2251		} else
2252			new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2253		if (new_in) {
2254			if (!psf->sf_oldin) {
2255				struct ip6_sf_list *prev = NULL;
2256
2257				for (dpsf = pmc->mca_tomb; dpsf;
2258				     dpsf = dpsf->sf_next) {
2259					if (ipv6_addr_equal(&dpsf->sf_addr,
2260					    &psf->sf_addr))
2261						break;
2262					prev = dpsf;
2263				}
2264				if (dpsf) {
2265					if (prev)
2266						prev->sf_next = dpsf->sf_next;
2267					else
2268						pmc->mca_tomb = dpsf->sf_next;
2269					kfree(dpsf);
2270				}
2271				psf->sf_crcount = qrv;
2272				rv++;
2273			}
2274		} else if (psf->sf_oldin) {
2275			psf->sf_crcount = 0;
2276			/*
2277			 * add or update "delete" records if an active filter
2278			 * is now inactive
2279			 */
2280			for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2281				if (ipv6_addr_equal(&dpsf->sf_addr,
2282				    &psf->sf_addr))
2283					break;
2284			if (!dpsf) {
2285				dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2286				if (!dpsf)
2287					continue;
2288				*dpsf = *psf;
2289				/* pmc->mca_lock held by callers */
2290				dpsf->sf_next = pmc->mca_tomb;
2291				pmc->mca_tomb = dpsf;
2292			}
2293			dpsf->sf_crcount = qrv;
2294			rv++;
2295		}
2296	}
2297	return rv;
2298}
2299
2300/*
2301 * Add multicast source filter list to the interface list
2302 */
2303static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2304			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
2305			  int delta)
2306{
2307	struct ifmcaddr6 *pmc;
2308	int	isexclude;
2309	int	i, err;
2310
2311	if (!idev)
2312		return -ENODEV;
2313	read_lock_bh(&idev->lock);
2314	for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2315		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2316			break;
2317	}
2318	if (!pmc) {
2319		/* MCA not found?? bug */
2320		read_unlock_bh(&idev->lock);
2321		return -ESRCH;
2322	}
2323	spin_lock_bh(&pmc->mca_lock);
2324
2325	sf_markstate(pmc);
2326	isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2327	if (!delta)
2328		pmc->mca_sfcount[sfmode]++;
2329	err = 0;
2330	for (i = 0; i < sfcount; i++) {
2331		err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2332		if (err)
2333			break;
2334	}
2335	if (err) {
2336		int j;
2337
2338		if (!delta)
2339			pmc->mca_sfcount[sfmode]--;
2340		for (j = 0; j < i; j++)
2341			ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2342	} else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2343		struct ip6_sf_list *psf;
2344
2345		/* filter mode change */
2346		if (pmc->mca_sfcount[MCAST_EXCLUDE])
2347			pmc->mca_sfmode = MCAST_EXCLUDE;
2348		else if (pmc->mca_sfcount[MCAST_INCLUDE])
2349			pmc->mca_sfmode = MCAST_INCLUDE;
2350		/* else no filters; keep old mode for reports */
2351
2352		pmc->mca_crcount = idev->mc_qrv;
2353		idev->mc_ifc_count = pmc->mca_crcount;
2354		for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2355			psf->sf_crcount = 0;
2356		mld_ifc_event(idev);
2357	} else if (sf_setstate(pmc))
2358		mld_ifc_event(idev);
2359	spin_unlock_bh(&pmc->mca_lock);
2360	read_unlock_bh(&idev->lock);
2361	return err;
2362}
2363
2364static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2365{
2366	struct ip6_sf_list *psf, *nextpsf;
2367
2368	for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2369		nextpsf = psf->sf_next;
2370		kfree(psf);
2371	}
2372	pmc->mca_tomb = NULL;
2373	for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2374		nextpsf = psf->sf_next;
2375		kfree(psf);
2376	}
2377	pmc->mca_sources = NULL;
2378	pmc->mca_sfmode = MCAST_EXCLUDE;
2379	pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2380	pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2381}
2382
2383
2384static void igmp6_join_group(struct ifmcaddr6 *ma)
2385{
2386	unsigned long delay;
2387
2388	if (ma->mca_flags & MAF_NOREPORT)
2389		return;
2390
2391	igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2392
2393	delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2394
2395	spin_lock_bh(&ma->mca_lock);
2396	if (del_timer(&ma->mca_timer)) {
2397		refcount_dec(&ma->mca_refcnt);
2398		delay = ma->mca_timer.expires - jiffies;
2399	}
2400
2401	if (!mod_timer(&ma->mca_timer, jiffies + delay))
2402		refcount_inc(&ma->mca_refcnt);
2403	ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2404	spin_unlock_bh(&ma->mca_lock);
2405}
2406
2407static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2408			    struct inet6_dev *idev)
2409{
2410	int err;
2411
2412	/* callers have the socket lock and rtnl lock
2413	 * so no other readers or writers of iml or its sflist
2414	 */
2415	if (!iml->sflist) {
2416		/* any-source empty exclude case */
2417		return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
 
 
 
 
 
2418	}
2419	err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2420		iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2421	sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2422	iml->sflist = NULL;
2423	return err;
2424}
2425
2426static void igmp6_leave_group(struct ifmcaddr6 *ma)
2427{
2428	if (mld_in_v1_mode(ma->idev)) {
2429		if (ma->mca_flags & MAF_LAST_REPORTER)
2430			igmp6_send(&ma->mca_addr, ma->idev->dev,
2431				ICMPV6_MGM_REDUCTION);
2432	} else {
2433		mld_add_delrec(ma->idev, ma);
2434		mld_ifc_event(ma->idev);
2435	}
2436}
2437
2438static void mld_gq_timer_expire(struct timer_list *t)
2439{
2440	struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer);
2441
2442	idev->mc_gq_running = 0;
2443	mld_send_report(idev, NULL);
2444	in6_dev_put(idev);
2445}
2446
2447static void mld_ifc_timer_expire(struct timer_list *t)
2448{
2449	struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer);
2450
2451	mld_send_cr(idev);
2452	if (idev->mc_ifc_count) {
2453		idev->mc_ifc_count--;
2454		if (idev->mc_ifc_count)
2455			mld_ifc_start_timer(idev, idev->mc_maxdelay);
 
2456	}
2457	in6_dev_put(idev);
2458}
2459
2460static void mld_ifc_event(struct inet6_dev *idev)
2461{
2462	if (mld_in_v1_mode(idev))
2463		return;
2464	idev->mc_ifc_count = idev->mc_qrv;
2465	mld_ifc_start_timer(idev, 1);
2466}
2467
2468static void igmp6_timer_handler(struct timer_list *t)
2469{
2470	struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer);
2471
2472	if (mld_in_v1_mode(ma->idev))
2473		igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2474	else
2475		mld_send_report(ma->idev, ma);
2476
2477	spin_lock(&ma->mca_lock);
2478	ma->mca_flags |=  MAF_LAST_REPORTER;
2479	ma->mca_flags &= ~MAF_TIMER_RUNNING;
2480	spin_unlock(&ma->mca_lock);
2481	ma_put(ma);
2482}
2483
2484/* Device changing type */
2485
2486void ipv6_mc_unmap(struct inet6_dev *idev)
2487{
2488	struct ifmcaddr6 *i;
2489
2490	/* Install multicast list, except for all-nodes (already installed) */
2491
2492	read_lock_bh(&idev->lock);
2493	for (i = idev->mc_list; i; i = i->next)
2494		igmp6_group_dropped(i);
2495	read_unlock_bh(&idev->lock);
2496}
2497
2498void ipv6_mc_remap(struct inet6_dev *idev)
2499{
2500	ipv6_mc_up(idev);
2501}
2502
2503/* Device going down */
2504
2505void ipv6_mc_down(struct inet6_dev *idev)
2506{
2507	struct ifmcaddr6 *i;
2508
2509	/* Withdraw multicast list */
2510
2511	read_lock_bh(&idev->lock);
2512
2513	for (i = idev->mc_list; i; i = i->next)
2514		igmp6_group_dropped(i);
2515
2516	/* Should stop timer after group drop. or we will
2517	 * start timer again in mld_ifc_event()
2518	 */
2519	mld_ifc_stop_timer(idev);
2520	mld_gq_stop_timer(idev);
2521	mld_dad_stop_timer(idev);
2522	read_unlock_bh(&idev->lock);
2523}
2524
2525static void ipv6_mc_reset(struct inet6_dev *idev)
2526{
2527	idev->mc_qrv = sysctl_mld_qrv;
2528	idev->mc_qi = MLD_QI_DEFAULT;
2529	idev->mc_qri = MLD_QRI_DEFAULT;
2530	idev->mc_v1_seen = 0;
2531	idev->mc_maxdelay = unsolicited_report_interval(idev);
2532}
2533
2534/* Device going up */
2535
2536void ipv6_mc_up(struct inet6_dev *idev)
2537{
2538	struct ifmcaddr6 *i;
2539
2540	/* Install multicast list, except for all-nodes (already installed) */
2541
2542	read_lock_bh(&idev->lock);
2543	ipv6_mc_reset(idev);
2544	for (i = idev->mc_list; i; i = i->next) {
2545		mld_del_delrec(idev, i);
2546		igmp6_group_added(i);
2547	}
2548	read_unlock_bh(&idev->lock);
2549}
2550
2551/* IPv6 device initialization. */
2552
2553void ipv6_mc_init_dev(struct inet6_dev *idev)
2554{
2555	write_lock_bh(&idev->lock);
2556	spin_lock_init(&idev->mc_lock);
2557	idev->mc_gq_running = 0;
2558	timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0);
2559	idev->mc_tomb = NULL;
2560	idev->mc_ifc_count = 0;
2561	timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0);
2562	timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0);
2563	ipv6_mc_reset(idev);
2564	write_unlock_bh(&idev->lock);
2565}
2566
2567/*
2568 *	Device is about to be destroyed: clean up.
2569 */
2570
2571void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2572{
2573	struct ifmcaddr6 *i;
2574
2575	/* Deactivate timers */
2576	ipv6_mc_down(idev);
2577	mld_clear_delrec(idev);
2578
2579	/* Delete all-nodes address. */
2580	/* We cannot call ipv6_dev_mc_dec() directly, our caller in
2581	 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2582	 * fail.
2583	 */
2584	__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2585
2586	if (idev->cnf.forwarding)
2587		__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2588
2589	write_lock_bh(&idev->lock);
2590	while ((i = idev->mc_list) != NULL) {
2591		idev->mc_list = i->next;
2592
2593		write_unlock_bh(&idev->lock);
2594		ma_put(i);
2595		write_lock_bh(&idev->lock);
2596	}
2597	write_unlock_bh(&idev->lock);
2598}
2599
2600static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2601{
2602	struct ifmcaddr6 *pmc;
2603
2604	ASSERT_RTNL();
2605
2606	if (mld_in_v1_mode(idev)) {
2607		read_lock_bh(&idev->lock);
2608		for (pmc = idev->mc_list; pmc; pmc = pmc->next)
2609			igmp6_join_group(pmc);
2610		read_unlock_bh(&idev->lock);
2611	} else
2612		mld_send_report(idev, NULL);
2613}
2614
2615static int ipv6_mc_netdev_event(struct notifier_block *this,
2616				unsigned long event,
2617				void *ptr)
2618{
2619	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2620	struct inet6_dev *idev = __in6_dev_get(dev);
2621
2622	switch (event) {
2623	case NETDEV_RESEND_IGMP:
2624		if (idev)
2625			ipv6_mc_rejoin_groups(idev);
2626		break;
2627	default:
2628		break;
2629	}
2630
2631	return NOTIFY_DONE;
2632}
2633
2634static struct notifier_block igmp6_netdev_notifier = {
2635	.notifier_call = ipv6_mc_netdev_event,
2636};
2637
2638#ifdef CONFIG_PROC_FS
2639struct igmp6_mc_iter_state {
2640	struct seq_net_private p;
2641	struct net_device *dev;
2642	struct inet6_dev *idev;
2643};
2644
2645#define igmp6_mc_seq_private(seq)	((struct igmp6_mc_iter_state *)(seq)->private)
2646
2647static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2648{
2649	struct ifmcaddr6 *im = NULL;
2650	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2651	struct net *net = seq_file_net(seq);
2652
2653	state->idev = NULL;
2654	for_each_netdev_rcu(net, state->dev) {
2655		struct inet6_dev *idev;
2656		idev = __in6_dev_get(state->dev);
2657		if (!idev)
2658			continue;
2659		read_lock_bh(&idev->lock);
2660		im = idev->mc_list;
2661		if (im) {
2662			state->idev = idev;
2663			break;
2664		}
2665		read_unlock_bh(&idev->lock);
2666	}
2667	return im;
2668}
2669
2670static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2671{
2672	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2673
2674	im = im->next;
2675	while (!im) {
2676		if (likely(state->idev))
2677			read_unlock_bh(&state->idev->lock);
2678
2679		state->dev = next_net_device_rcu(state->dev);
2680		if (!state->dev) {
2681			state->idev = NULL;
2682			break;
2683		}
2684		state->idev = __in6_dev_get(state->dev);
2685		if (!state->idev)
2686			continue;
2687		read_lock_bh(&state->idev->lock);
2688		im = state->idev->mc_list;
2689	}
2690	return im;
2691}
2692
2693static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2694{
2695	struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2696	if (im)
2697		while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2698			--pos;
2699	return pos ? NULL : im;
2700}
2701
2702static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2703	__acquires(RCU)
2704{
2705	rcu_read_lock();
2706	return igmp6_mc_get_idx(seq, *pos);
2707}
2708
2709static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2710{
2711	struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2712
2713	++*pos;
2714	return im;
2715}
2716
2717static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2718	__releases(RCU)
2719{
2720	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2721
2722	if (likely(state->idev)) {
2723		read_unlock_bh(&state->idev->lock);
2724		state->idev = NULL;
2725	}
2726	state->dev = NULL;
2727	rcu_read_unlock();
2728}
2729
2730static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2731{
2732	struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2733	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2734
2735	seq_printf(seq,
2736		   "%-4d %-15s %pi6 %5d %08X %ld\n",
2737		   state->dev->ifindex, state->dev->name,
2738		   &im->mca_addr,
2739		   im->mca_users, im->mca_flags,
2740		   (im->mca_flags&MAF_TIMER_RUNNING) ?
2741		   jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2742	return 0;
2743}
2744
2745static const struct seq_operations igmp6_mc_seq_ops = {
2746	.start	=	igmp6_mc_seq_start,
2747	.next	=	igmp6_mc_seq_next,
2748	.stop	=	igmp6_mc_seq_stop,
2749	.show	=	igmp6_mc_seq_show,
2750};
2751
2752static int igmp6_mc_seq_open(struct inode *inode, struct file *file)
2753{
2754	return seq_open_net(inode, file, &igmp6_mc_seq_ops,
2755			    sizeof(struct igmp6_mc_iter_state));
2756}
2757
2758static const struct file_operations igmp6_mc_seq_fops = {
2759	.open		=	igmp6_mc_seq_open,
2760	.read		=	seq_read,
2761	.llseek		=	seq_lseek,
2762	.release	=	seq_release_net,
2763};
2764
2765struct igmp6_mcf_iter_state {
2766	struct seq_net_private p;
2767	struct net_device *dev;
2768	struct inet6_dev *idev;
2769	struct ifmcaddr6 *im;
2770};
2771
2772#define igmp6_mcf_seq_private(seq)	((struct igmp6_mcf_iter_state *)(seq)->private)
2773
2774static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2775{
2776	struct ip6_sf_list *psf = NULL;
2777	struct ifmcaddr6 *im = NULL;
2778	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2779	struct net *net = seq_file_net(seq);
2780
2781	state->idev = NULL;
2782	state->im = NULL;
2783	for_each_netdev_rcu(net, state->dev) {
2784		struct inet6_dev *idev;
2785		idev = __in6_dev_get(state->dev);
2786		if (unlikely(idev == NULL))
2787			continue;
2788		read_lock_bh(&idev->lock);
2789		im = idev->mc_list;
2790		if (likely(im)) {
2791			spin_lock_bh(&im->mca_lock);
2792			psf = im->mca_sources;
2793			if (likely(psf)) {
2794				state->im = im;
2795				state->idev = idev;
2796				break;
2797			}
2798			spin_unlock_bh(&im->mca_lock);
2799		}
2800		read_unlock_bh(&idev->lock);
2801	}
2802	return psf;
2803}
2804
2805static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2806{
2807	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2808
2809	psf = psf->sf_next;
2810	while (!psf) {
2811		spin_unlock_bh(&state->im->mca_lock);
2812		state->im = state->im->next;
2813		while (!state->im) {
2814			if (likely(state->idev))
2815				read_unlock_bh(&state->idev->lock);
2816
2817			state->dev = next_net_device_rcu(state->dev);
2818			if (!state->dev) {
2819				state->idev = NULL;
2820				goto out;
2821			}
2822			state->idev = __in6_dev_get(state->dev);
2823			if (!state->idev)
2824				continue;
2825			read_lock_bh(&state->idev->lock);
2826			state->im = state->idev->mc_list;
2827		}
2828		if (!state->im)
2829			break;
2830		spin_lock_bh(&state->im->mca_lock);
2831		psf = state->im->mca_sources;
2832	}
2833out:
2834	return psf;
2835}
2836
2837static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2838{
2839	struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2840	if (psf)
2841		while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2842			--pos;
2843	return pos ? NULL : psf;
2844}
2845
2846static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2847	__acquires(RCU)
2848{
2849	rcu_read_lock();
2850	return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2851}
2852
2853static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2854{
2855	struct ip6_sf_list *psf;
2856	if (v == SEQ_START_TOKEN)
2857		psf = igmp6_mcf_get_first(seq);
2858	else
2859		psf = igmp6_mcf_get_next(seq, v);
2860	++*pos;
2861	return psf;
2862}
2863
2864static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2865	__releases(RCU)
2866{
2867	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2868	if (likely(state->im)) {
2869		spin_unlock_bh(&state->im->mca_lock);
2870		state->im = NULL;
2871	}
2872	if (likely(state->idev)) {
2873		read_unlock_bh(&state->idev->lock);
2874		state->idev = NULL;
2875	}
2876	state->dev = NULL;
2877	rcu_read_unlock();
2878}
2879
2880static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2881{
2882	struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2883	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2884
2885	if (v == SEQ_START_TOKEN) {
2886		seq_puts(seq, "Idx Device                Multicast Address                   Source Address    INC    EXC\n");
2887	} else {
2888		seq_printf(seq,
2889			   "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2890			   state->dev->ifindex, state->dev->name,
2891			   &state->im->mca_addr,
2892			   &psf->sf_addr,
2893			   psf->sf_count[MCAST_INCLUDE],
2894			   psf->sf_count[MCAST_EXCLUDE]);
2895	}
2896	return 0;
2897}
2898
2899static const struct seq_operations igmp6_mcf_seq_ops = {
2900	.start	=	igmp6_mcf_seq_start,
2901	.next	=	igmp6_mcf_seq_next,
2902	.stop	=	igmp6_mcf_seq_stop,
2903	.show	=	igmp6_mcf_seq_show,
2904};
2905
2906static int igmp6_mcf_seq_open(struct inode *inode, struct file *file)
2907{
2908	return seq_open_net(inode, file, &igmp6_mcf_seq_ops,
2909			    sizeof(struct igmp6_mcf_iter_state));
2910}
2911
2912static const struct file_operations igmp6_mcf_seq_fops = {
2913	.open		=	igmp6_mcf_seq_open,
2914	.read		=	seq_read,
2915	.llseek		=	seq_lseek,
2916	.release	=	seq_release_net,
2917};
2918
2919static int __net_init igmp6_proc_init(struct net *net)
2920{
2921	int err;
2922
2923	err = -ENOMEM;
2924	if (!proc_create("igmp6", 0444, net->proc_net, &igmp6_mc_seq_fops))
 
2925		goto out;
2926	if (!proc_create("mcfilter6", 0444, net->proc_net,
2927			 &igmp6_mcf_seq_fops))
 
2928		goto out_proc_net_igmp6;
2929
2930	err = 0;
2931out:
2932	return err;
2933
2934out_proc_net_igmp6:
2935	remove_proc_entry("igmp6", net->proc_net);
2936	goto out;
2937}
2938
2939static void __net_exit igmp6_proc_exit(struct net *net)
2940{
2941	remove_proc_entry("mcfilter6", net->proc_net);
2942	remove_proc_entry("igmp6", net->proc_net);
2943}
2944#else
2945static inline int igmp6_proc_init(struct net *net)
2946{
2947	return 0;
2948}
2949static inline void igmp6_proc_exit(struct net *net)
2950{
2951}
2952#endif
2953
2954static int __net_init igmp6_net_init(struct net *net)
2955{
2956	int err;
2957
2958	err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2959				   SOCK_RAW, IPPROTO_ICMPV6, net);
2960	if (err < 0) {
2961		pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2962		       err);
2963		goto out;
2964	}
2965
2966	inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2967
2968	err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2969				   SOCK_RAW, IPPROTO_ICMPV6, net);
2970	if (err < 0) {
2971		pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2972		       err);
2973		goto out_sock_create;
2974	}
2975
2976	err = igmp6_proc_init(net);
2977	if (err)
2978		goto out_sock_create_autojoin;
2979
2980	return 0;
2981
2982out_sock_create_autojoin:
2983	inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2984out_sock_create:
2985	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2986out:
2987	return err;
2988}
2989
2990static void __net_exit igmp6_net_exit(struct net *net)
2991{
2992	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2993	inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2994	igmp6_proc_exit(net);
2995}
2996
2997static struct pernet_operations igmp6_net_ops = {
2998	.init = igmp6_net_init,
2999	.exit = igmp6_net_exit,
3000};
3001
3002int __init igmp6_init(void)
3003{
3004	return register_pernet_subsys(&igmp6_net_ops);
3005}
3006
3007int __init igmp6_late_init(void)
3008{
3009	return register_netdevice_notifier(&igmp6_netdev_notifier);
3010}
3011
3012void igmp6_cleanup(void)
3013{
3014	unregister_pernet_subsys(&igmp6_net_ops);
3015}
3016
3017void igmp6_late_cleanup(void)
3018{
3019	unregister_netdevice_notifier(&igmp6_netdev_notifier);
3020}
v5.4
   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 *	Multicast support for IPv6
   4 *	Linux INET6 implementation
   5 *
   6 *	Authors:
   7 *	Pedro Roque		<roque@di.fc.ul.pt>
   8 *
   9 *	Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
 
 
 
 
 
  10 */
  11
  12/* Changes:
  13 *
  14 *	yoshfuji	: fix format of router-alert option
  15 *	YOSHIFUJI Hideaki @USAGI:
  16 *		Fixed source address for MLD message based on
  17 *		<draft-ietf-magma-mld-source-05.txt>.
  18 *	YOSHIFUJI Hideaki @USAGI:
  19 *		- Ignore Queries for invalid addresses.
  20 *		- MLD for link-local addresses.
  21 *	David L Stevens <dlstevens@us.ibm.com>:
  22 *		- MLDv2 support
  23 */
  24
  25#include <linux/module.h>
  26#include <linux/errno.h>
  27#include <linux/types.h>
  28#include <linux/string.h>
  29#include <linux/socket.h>
  30#include <linux/sockios.h>
  31#include <linux/jiffies.h>
  32#include <linux/times.h>
  33#include <linux/net.h>
  34#include <linux/in.h>
  35#include <linux/in6.h>
  36#include <linux/netdevice.h>
  37#include <linux/if_arp.h>
  38#include <linux/route.h>
  39#include <linux/init.h>
  40#include <linux/proc_fs.h>
  41#include <linux/seq_file.h>
  42#include <linux/slab.h>
  43#include <linux/pkt_sched.h>
  44#include <net/mld.h>
  45
  46#include <linux/netfilter.h>
  47#include <linux/netfilter_ipv6.h>
  48
  49#include <net/net_namespace.h>
  50#include <net/sock.h>
  51#include <net/snmp.h>
  52
  53#include <net/ipv6.h>
  54#include <net/protocol.h>
  55#include <net/if_inet6.h>
  56#include <net/ndisc.h>
  57#include <net/addrconf.h>
  58#include <net/ip6_route.h>
  59#include <net/inet_common.h>
  60
  61#include <net/ip6_checksum.h>
  62
  63/* Ensure that we have struct in6_addr aligned on 32bit word. */
  64static int __mld2_query_bugs[] __attribute__((__unused__)) = {
  65	BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
  66	BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
  67	BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
  68};
  69
  70static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
  71
  72static void igmp6_join_group(struct ifmcaddr6 *ma);
  73static void igmp6_leave_group(struct ifmcaddr6 *ma);
  74static void igmp6_timer_handler(struct timer_list *t);
  75
  76static void mld_gq_timer_expire(struct timer_list *t);
  77static void mld_ifc_timer_expire(struct timer_list *t);
  78static void mld_ifc_event(struct inet6_dev *idev);
  79static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  80static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc);
  81static void mld_clear_delrec(struct inet6_dev *idev);
  82static bool mld_in_v1_mode(const struct inet6_dev *idev);
  83static int sf_setstate(struct ifmcaddr6 *pmc);
  84static void sf_markstate(struct ifmcaddr6 *pmc);
  85static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
  86static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  87			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
  88			  int delta);
  89static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
  90			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
  91			  int delta);
  92static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
  93			    struct inet6_dev *idev);
  94static int __ipv6_dev_mc_inc(struct net_device *dev,
  95			     const struct in6_addr *addr, unsigned int mode);
  96
  97#define MLD_QRV_DEFAULT		2
  98/* RFC3810, 9.2. Query Interval */
  99#define MLD_QI_DEFAULT		(125 * HZ)
 100/* RFC3810, 9.3. Query Response Interval */
 101#define MLD_QRI_DEFAULT		(10 * HZ)
 102
 103/* RFC3810, 8.1 Query Version Distinctions */
 104#define MLD_V1_QUERY_LEN	24
 105#define MLD_V2_QUERY_LEN_MIN	28
 106
 107#define IPV6_MLD_MAX_MSF	64
 108
 109int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
 110int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
 111
 112/*
 113 *	socket join on multicast group
 114 */
 115
 116#define for_each_pmc_rcu(np, pmc)				\
 117	for (pmc = rcu_dereference(np->ipv6_mc_list);		\
 118	     pmc != NULL;					\
 119	     pmc = rcu_dereference(pmc->next))
 120
 121static int unsolicited_report_interval(struct inet6_dev *idev)
 122{
 123	int iv;
 124
 125	if (mld_in_v1_mode(idev))
 126		iv = idev->cnf.mldv1_unsolicited_report_interval;
 127	else
 128		iv = idev->cnf.mldv2_unsolicited_report_interval;
 129
 130	return iv > 0 ? iv : 1;
 131}
 132
 133static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
 134			       const struct in6_addr *addr, unsigned int mode)
 135{
 136	struct net_device *dev = NULL;
 137	struct ipv6_mc_socklist *mc_lst;
 138	struct ipv6_pinfo *np = inet6_sk(sk);
 139	struct net *net = sock_net(sk);
 140	int err;
 141
 142	ASSERT_RTNL();
 143
 144	if (!ipv6_addr_is_multicast(addr))
 145		return -EINVAL;
 146
 147	rcu_read_lock();
 148	for_each_pmc_rcu(np, mc_lst) {
 149		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 150		    ipv6_addr_equal(&mc_lst->addr, addr)) {
 151			rcu_read_unlock();
 152			return -EADDRINUSE;
 153		}
 154	}
 155	rcu_read_unlock();
 156
 157	mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
 158
 159	if (!mc_lst)
 160		return -ENOMEM;
 161
 162	mc_lst->next = NULL;
 163	mc_lst->addr = *addr;
 164
 165	if (ifindex == 0) {
 166		struct rt6_info *rt;
 167		rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
 168		if (rt) {
 169			dev = rt->dst.dev;
 170			ip6_rt_put(rt);
 171		}
 172	} else
 173		dev = __dev_get_by_index(net, ifindex);
 174
 175	if (!dev) {
 176		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 177		return -ENODEV;
 178	}
 179
 180	mc_lst->ifindex = dev->ifindex;
 181	mc_lst->sfmode = mode;
 182	rwlock_init(&mc_lst->sflock);
 183	mc_lst->sflist = NULL;
 184
 185	/*
 186	 *	now add/increase the group membership on the device
 187	 */
 188
 189	err = __ipv6_dev_mc_inc(dev, addr, mode);
 190
 191	if (err) {
 192		sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
 193		return err;
 194	}
 195
 196	mc_lst->next = np->ipv6_mc_list;
 197	rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
 198
 199	return 0;
 200}
 201
 202int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
 203{
 204	return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
 205}
 206EXPORT_SYMBOL(ipv6_sock_mc_join);
 207
 208int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
 209			  const struct in6_addr *addr, unsigned int mode)
 210{
 211	return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
 212}
 213
 214/*
 215 *	socket leave on multicast group
 216 */
 217int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
 218{
 219	struct ipv6_pinfo *np = inet6_sk(sk);
 220	struct ipv6_mc_socklist *mc_lst;
 221	struct ipv6_mc_socklist __rcu **lnk;
 222	struct net *net = sock_net(sk);
 223
 224	ASSERT_RTNL();
 225
 226	if (!ipv6_addr_is_multicast(addr))
 227		return -EINVAL;
 228
 229	for (lnk = &np->ipv6_mc_list;
 230	     (mc_lst = rtnl_dereference(*lnk)) != NULL;
 231	      lnk = &mc_lst->next) {
 232		if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
 233		    ipv6_addr_equal(&mc_lst->addr, addr)) {
 234			struct net_device *dev;
 235
 236			*lnk = mc_lst->next;
 237
 238			dev = __dev_get_by_index(net, mc_lst->ifindex);
 239			if (dev) {
 240				struct inet6_dev *idev = __in6_dev_get(dev);
 241
 242				(void) ip6_mc_leave_src(sk, mc_lst, idev);
 243				if (idev)
 244					__ipv6_dev_mc_dec(idev, &mc_lst->addr);
 245			} else
 246				(void) ip6_mc_leave_src(sk, mc_lst, NULL);
 247
 248			atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 249			kfree_rcu(mc_lst, rcu);
 250			return 0;
 251		}
 252	}
 253
 254	return -EADDRNOTAVAIL;
 255}
 256EXPORT_SYMBOL(ipv6_sock_mc_drop);
 257
 258/* called with rcu_read_lock() */
 259static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net,
 260					     const struct in6_addr *group,
 261					     int ifindex)
 262{
 263	struct net_device *dev = NULL;
 264	struct inet6_dev *idev = NULL;
 265
 266	if (ifindex == 0) {
 267		struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
 268
 269		if (rt) {
 270			dev = rt->dst.dev;
 271			ip6_rt_put(rt);
 272		}
 273	} else
 274		dev = dev_get_by_index_rcu(net, ifindex);
 275
 276	if (!dev)
 277		return NULL;
 278	idev = __in6_dev_get(dev);
 279	if (!idev)
 280		return NULL;
 281	read_lock_bh(&idev->lock);
 282	if (idev->dead) {
 283		read_unlock_bh(&idev->lock);
 284		return NULL;
 285	}
 286	return idev;
 287}
 288
 289void __ipv6_sock_mc_close(struct sock *sk)
 290{
 291	struct ipv6_pinfo *np = inet6_sk(sk);
 292	struct ipv6_mc_socklist *mc_lst;
 293	struct net *net = sock_net(sk);
 294
 295	ASSERT_RTNL();
 296
 297	while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) {
 298		struct net_device *dev;
 299
 300		np->ipv6_mc_list = mc_lst->next;
 301
 302		dev = __dev_get_by_index(net, mc_lst->ifindex);
 303		if (dev) {
 304			struct inet6_dev *idev = __in6_dev_get(dev);
 305
 306			(void) ip6_mc_leave_src(sk, mc_lst, idev);
 307			if (idev)
 308				__ipv6_dev_mc_dec(idev, &mc_lst->addr);
 309		} else
 310			(void) ip6_mc_leave_src(sk, mc_lst, NULL);
 311
 312		atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
 313		kfree_rcu(mc_lst, rcu);
 314	}
 315}
 316
 317void ipv6_sock_mc_close(struct sock *sk)
 318{
 319	struct ipv6_pinfo *np = inet6_sk(sk);
 320
 321	if (!rcu_access_pointer(np->ipv6_mc_list))
 322		return;
 323	rtnl_lock();
 324	__ipv6_sock_mc_close(sk);
 325	rtnl_unlock();
 326}
 327
 328int ip6_mc_source(int add, int omode, struct sock *sk,
 329	struct group_source_req *pgsr)
 330{
 331	struct in6_addr *source, *group;
 332	struct ipv6_mc_socklist *pmc;
 333	struct inet6_dev *idev;
 334	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 335	struct ip6_sf_socklist *psl;
 336	struct net *net = sock_net(sk);
 337	int i, j, rv;
 338	int leavegroup = 0;
 339	int pmclocked = 0;
 340	int err;
 341
 342	source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
 343	group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
 344
 345	if (!ipv6_addr_is_multicast(group))
 346		return -EINVAL;
 347
 348	rcu_read_lock();
 349	idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface);
 350	if (!idev) {
 351		rcu_read_unlock();
 352		return -ENODEV;
 353	}
 354
 355	err = -EADDRNOTAVAIL;
 356
 357	for_each_pmc_rcu(inet6, pmc) {
 358		if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
 359			continue;
 360		if (ipv6_addr_equal(&pmc->addr, group))
 361			break;
 362	}
 363	if (!pmc) {		/* must have a prior join */
 364		err = -EINVAL;
 365		goto done;
 366	}
 367	/* if a source filter was set, must be the same mode as before */
 368	if (pmc->sflist) {
 369		if (pmc->sfmode != omode) {
 370			err = -EINVAL;
 371			goto done;
 372		}
 373	} else if (pmc->sfmode != omode) {
 374		/* allow mode switches for empty-set filters */
 375		ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
 376		ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 377		pmc->sfmode = omode;
 378	}
 379
 380	write_lock(&pmc->sflock);
 381	pmclocked = 1;
 382
 383	psl = pmc->sflist;
 384	if (!add) {
 385		if (!psl)
 386			goto done;	/* err = -EADDRNOTAVAIL */
 387		rv = !0;
 388		for (i = 0; i < psl->sl_count; i++) {
 389			rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 390			if (rv == 0)
 391				break;
 392		}
 393		if (rv)		/* source not found */
 394			goto done;	/* err = -EADDRNOTAVAIL */
 395
 396		/* special case - (INCLUDE, empty) == LEAVE_GROUP */
 397		if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
 398			leavegroup = 1;
 399			goto done;
 400		}
 401
 402		/* update the interface filter */
 403		ip6_mc_del_src(idev, group, omode, 1, source, 1);
 404
 405		for (j = i+1; j < psl->sl_count; j++)
 406			psl->sl_addr[j-1] = psl->sl_addr[j];
 407		psl->sl_count--;
 408		err = 0;
 409		goto done;
 410	}
 411	/* else, add a new source to the filter */
 412
 413	if (psl && psl->sl_count >= sysctl_mld_max_msf) {
 414		err = -ENOBUFS;
 415		goto done;
 416	}
 417	if (!psl || psl->sl_count == psl->sl_max) {
 418		struct ip6_sf_socklist *newpsl;
 419		int count = IP6_SFBLOCK;
 420
 421		if (psl)
 422			count += psl->sl_max;
 423		newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
 424		if (!newpsl) {
 425			err = -ENOBUFS;
 426			goto done;
 427		}
 428		newpsl->sl_max = count;
 429		newpsl->sl_count = count - IP6_SFBLOCK;
 430		if (psl) {
 431			for (i = 0; i < psl->sl_count; i++)
 432				newpsl->sl_addr[i] = psl->sl_addr[i];
 433			sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 434		}
 435		pmc->sflist = psl = newpsl;
 436	}
 437	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
 438	for (i = 0; i < psl->sl_count; i++) {
 439		rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
 440		if (rv == 0) /* There is an error in the address. */
 441			goto done;
 442	}
 443	for (j = psl->sl_count-1; j >= i; j--)
 444		psl->sl_addr[j+1] = psl->sl_addr[j];
 445	psl->sl_addr[i] = *source;
 446	psl->sl_count++;
 447	err = 0;
 448	/* update the interface list */
 449	ip6_mc_add_src(idev, group, omode, 1, source, 1);
 450done:
 451	if (pmclocked)
 452		write_unlock(&pmc->sflock);
 453	read_unlock_bh(&idev->lock);
 454	rcu_read_unlock();
 455	if (leavegroup)
 456		err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
 457	return err;
 458}
 459
 460int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
 461{
 462	const struct in6_addr *group;
 463	struct ipv6_mc_socklist *pmc;
 464	struct inet6_dev *idev;
 465	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 466	struct ip6_sf_socklist *newpsl, *psl;
 467	struct net *net = sock_net(sk);
 468	int leavegroup = 0;
 469	int i, err;
 470
 471	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 472
 473	if (!ipv6_addr_is_multicast(group))
 474		return -EINVAL;
 475	if (gsf->gf_fmode != MCAST_INCLUDE &&
 476	    gsf->gf_fmode != MCAST_EXCLUDE)
 477		return -EINVAL;
 478
 479	rcu_read_lock();
 480	idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 481
 482	if (!idev) {
 483		rcu_read_unlock();
 484		return -ENODEV;
 485	}
 486
 487	err = 0;
 488
 489	if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
 490		leavegroup = 1;
 491		goto done;
 492	}
 493
 494	for_each_pmc_rcu(inet6, pmc) {
 495		if (pmc->ifindex != gsf->gf_interface)
 496			continue;
 497		if (ipv6_addr_equal(&pmc->addr, group))
 498			break;
 499	}
 500	if (!pmc) {		/* must have a prior join */
 501		err = -EINVAL;
 502		goto done;
 503	}
 504	if (gsf->gf_numsrc) {
 505		newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
 506							  GFP_ATOMIC);
 507		if (!newpsl) {
 508			err = -ENOBUFS;
 509			goto done;
 510		}
 511		newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
 512		for (i = 0; i < newpsl->sl_count; ++i) {
 513			struct sockaddr_in6 *psin6;
 514
 515			psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i];
 516			newpsl->sl_addr[i] = psin6->sin6_addr;
 517		}
 518		err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
 519			newpsl->sl_count, newpsl->sl_addr, 0);
 520		if (err) {
 521			sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max));
 522			goto done;
 523		}
 524	} else {
 525		newpsl = NULL;
 526		(void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
 527	}
 528
 529	write_lock(&pmc->sflock);
 530	psl = pmc->sflist;
 531	if (psl) {
 532		(void) ip6_mc_del_src(idev, group, pmc->sfmode,
 533			psl->sl_count, psl->sl_addr, 0);
 534		sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max));
 535	} else
 536		(void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
 537	pmc->sflist = newpsl;
 538	pmc->sfmode = gsf->gf_fmode;
 539	write_unlock(&pmc->sflock);
 540	err = 0;
 541done:
 542	read_unlock_bh(&idev->lock);
 543	rcu_read_unlock();
 544	if (leavegroup)
 545		err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
 546	return err;
 547}
 548
 549int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
 550	struct group_filter __user *optval, int __user *optlen)
 551{
 552	int err, i, count, copycount;
 553	const struct in6_addr *group;
 554	struct ipv6_mc_socklist *pmc;
 555	struct inet6_dev *idev;
 556	struct ipv6_pinfo *inet6 = inet6_sk(sk);
 557	struct ip6_sf_socklist *psl;
 558	struct net *net = sock_net(sk);
 559
 560	group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
 561
 562	if (!ipv6_addr_is_multicast(group))
 563		return -EINVAL;
 564
 565	rcu_read_lock();
 566	idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface);
 567
 568	if (!idev) {
 569		rcu_read_unlock();
 570		return -ENODEV;
 571	}
 572
 573	err = -EADDRNOTAVAIL;
 574	/* changes to the ipv6_mc_list require the socket lock and
 575	 * rtnl lock. We have the socket lock and rcu read lock,
 576	 * so reading the list is safe.
 577	 */
 578
 579	for_each_pmc_rcu(inet6, pmc) {
 580		if (pmc->ifindex != gsf->gf_interface)
 581			continue;
 582		if (ipv6_addr_equal(group, &pmc->addr))
 583			break;
 584	}
 585	if (!pmc)		/* must have a prior join */
 586		goto done;
 587	gsf->gf_fmode = pmc->sfmode;
 588	psl = pmc->sflist;
 589	count = psl ? psl->sl_count : 0;
 590	read_unlock_bh(&idev->lock);
 591	rcu_read_unlock();
 592
 593	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
 594	gsf->gf_numsrc = count;
 595	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
 596	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
 597		return -EFAULT;
 598	}
 599	/* changes to psl require the socket lock, and a write lock
 600	 * on pmc->sflock. We have the socket lock so reading here is safe.
 601	 */
 602	for (i = 0; i < copycount; i++) {
 603		struct sockaddr_in6 *psin6;
 604		struct sockaddr_storage ss;
 605
 606		psin6 = (struct sockaddr_in6 *)&ss;
 607		memset(&ss, 0, sizeof(ss));
 608		psin6->sin6_family = AF_INET6;
 609		psin6->sin6_addr = psl->sl_addr[i];
 610		if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
 611			return -EFAULT;
 612	}
 613	return 0;
 614done:
 615	read_unlock_bh(&idev->lock);
 616	rcu_read_unlock();
 617	return err;
 618}
 619
 620bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
 621		    const struct in6_addr *src_addr)
 622{
 623	struct ipv6_pinfo *np = inet6_sk(sk);
 624	struct ipv6_mc_socklist *mc;
 625	struct ip6_sf_socklist *psl;
 626	bool rv = true;
 627
 628	rcu_read_lock();
 629	for_each_pmc_rcu(np, mc) {
 630		if (ipv6_addr_equal(&mc->addr, mc_addr))
 631			break;
 632	}
 633	if (!mc) {
 634		rcu_read_unlock();
 635		return np->mc_all;
 636	}
 637	read_lock(&mc->sflock);
 638	psl = mc->sflist;
 639	if (!psl) {
 640		rv = mc->sfmode == MCAST_EXCLUDE;
 641	} else {
 642		int i;
 643
 644		for (i = 0; i < psl->sl_count; i++) {
 645			if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
 646				break;
 647		}
 648		if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
 649			rv = false;
 650		if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
 651			rv = false;
 652	}
 653	read_unlock(&mc->sflock);
 654	rcu_read_unlock();
 655
 656	return rv;
 657}
 658
 659static void igmp6_group_added(struct ifmcaddr6 *mc)
 660{
 661	struct net_device *dev = mc->idev->dev;
 662	char buf[MAX_ADDR_LEN];
 663
 664	if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 665	    IPV6_ADDR_SCOPE_LINKLOCAL)
 666		return;
 667
 668	spin_lock_bh(&mc->mca_lock);
 669	if (!(mc->mca_flags&MAF_LOADED)) {
 670		mc->mca_flags |= MAF_LOADED;
 671		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 672			dev_mc_add(dev, buf);
 673	}
 674	spin_unlock_bh(&mc->mca_lock);
 675
 676	if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
 677		return;
 678
 679	if (mld_in_v1_mode(mc->idev)) {
 680		igmp6_join_group(mc);
 681		return;
 682	}
 683	/* else v2 */
 684
 685	/* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
 686	 * should not send filter-mode change record as the mode
 687	 * should be from IN() to IN(A).
 688	 */
 689	if (mc->mca_sfmode == MCAST_EXCLUDE)
 690		mc->mca_crcount = mc->idev->mc_qrv;
 691
 692	mld_ifc_event(mc->idev);
 693}
 694
 695static void igmp6_group_dropped(struct ifmcaddr6 *mc)
 696{
 697	struct net_device *dev = mc->idev->dev;
 698	char buf[MAX_ADDR_LEN];
 699
 700	if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
 701	    IPV6_ADDR_SCOPE_LINKLOCAL)
 702		return;
 703
 704	spin_lock_bh(&mc->mca_lock);
 705	if (mc->mca_flags&MAF_LOADED) {
 706		mc->mca_flags &= ~MAF_LOADED;
 707		if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
 708			dev_mc_del(dev, buf);
 709	}
 710
 711	spin_unlock_bh(&mc->mca_lock);
 712	if (mc->mca_flags & MAF_NOREPORT)
 713		return;
 714
 715	if (!mc->idev->dead)
 716		igmp6_leave_group(mc);
 717
 718	spin_lock_bh(&mc->mca_lock);
 719	if (del_timer(&mc->mca_timer))
 720		refcount_dec(&mc->mca_refcnt);
 721	spin_unlock_bh(&mc->mca_lock);
 722}
 723
 724/*
 725 * deleted ifmcaddr6 manipulation
 726 */
 727static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 728{
 729	struct ifmcaddr6 *pmc;
 730
 731	/* this is an "ifmcaddr6" for convenience; only the fields below
 732	 * are actually used. In particular, the refcnt and users are not
 733	 * used for management of the delete list. Using the same structure
 734	 * for deleted items allows change reports to use common code with
 735	 * non-deleted or query-response MCA's.
 736	 */
 737	pmc = kzalloc(sizeof(*pmc), GFP_ATOMIC);
 738	if (!pmc)
 739		return;
 740
 741	spin_lock_bh(&im->mca_lock);
 742	spin_lock_init(&pmc->mca_lock);
 743	pmc->idev = im->idev;
 744	in6_dev_hold(idev);
 745	pmc->mca_addr = im->mca_addr;
 746	pmc->mca_crcount = idev->mc_qrv;
 747	pmc->mca_sfmode = im->mca_sfmode;
 748	if (pmc->mca_sfmode == MCAST_INCLUDE) {
 749		struct ip6_sf_list *psf;
 750
 751		pmc->mca_tomb = im->mca_tomb;
 752		pmc->mca_sources = im->mca_sources;
 753		im->mca_tomb = im->mca_sources = NULL;
 754		for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
 755			psf->sf_crcount = pmc->mca_crcount;
 756	}
 757	spin_unlock_bh(&im->mca_lock);
 758
 759	spin_lock_bh(&idev->mc_lock);
 760	pmc->next = idev->mc_tomb;
 761	idev->mc_tomb = pmc;
 762	spin_unlock_bh(&idev->mc_lock);
 763}
 764
 765static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
 766{
 767	struct ifmcaddr6 *pmc, *pmc_prev;
 768	struct ip6_sf_list *psf;
 769	struct in6_addr *pmca = &im->mca_addr;
 770
 771	spin_lock_bh(&idev->mc_lock);
 772	pmc_prev = NULL;
 773	for (pmc = idev->mc_tomb; pmc; pmc = pmc->next) {
 774		if (ipv6_addr_equal(&pmc->mca_addr, pmca))
 775			break;
 776		pmc_prev = pmc;
 777	}
 778	if (pmc) {
 779		if (pmc_prev)
 780			pmc_prev->next = pmc->next;
 781		else
 782			idev->mc_tomb = pmc->next;
 783	}
 784	spin_unlock_bh(&idev->mc_lock);
 785
 786	spin_lock_bh(&im->mca_lock);
 787	if (pmc) {
 788		im->idev = pmc->idev;
 789		if (im->mca_sfmode == MCAST_INCLUDE) {
 790			swap(im->mca_tomb, pmc->mca_tomb);
 791			swap(im->mca_sources, pmc->mca_sources);
 
 
 792			for (psf = im->mca_sources; psf; psf = psf->sf_next)
 793				psf->sf_crcount = idev->mc_qrv;
 794		} else {
 795			im->mca_crcount = idev->mc_qrv;
 796		}
 797		in6_dev_put(pmc->idev);
 798		ip6_mc_clear_src(pmc);
 799		kfree(pmc);
 800	}
 801	spin_unlock_bh(&im->mca_lock);
 802}
 803
 804static void mld_clear_delrec(struct inet6_dev *idev)
 805{
 806	struct ifmcaddr6 *pmc, *nextpmc;
 807
 808	spin_lock_bh(&idev->mc_lock);
 809	pmc = idev->mc_tomb;
 810	idev->mc_tomb = NULL;
 811	spin_unlock_bh(&idev->mc_lock);
 812
 813	for (; pmc; pmc = nextpmc) {
 814		nextpmc = pmc->next;
 815		ip6_mc_clear_src(pmc);
 816		in6_dev_put(pmc->idev);
 817		kfree(pmc);
 818	}
 819
 820	/* clear dead sources, too */
 821	read_lock_bh(&idev->lock);
 822	for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
 823		struct ip6_sf_list *psf, *psf_next;
 824
 825		spin_lock_bh(&pmc->mca_lock);
 826		psf = pmc->mca_tomb;
 827		pmc->mca_tomb = NULL;
 828		spin_unlock_bh(&pmc->mca_lock);
 829		for (; psf; psf = psf_next) {
 830			psf_next = psf->sf_next;
 831			kfree(psf);
 832		}
 833	}
 834	read_unlock_bh(&idev->lock);
 835}
 836
 837static void mca_get(struct ifmcaddr6 *mc)
 838{
 839	refcount_inc(&mc->mca_refcnt);
 840}
 841
 842static void ma_put(struct ifmcaddr6 *mc)
 843{
 844	if (refcount_dec_and_test(&mc->mca_refcnt)) {
 845		in6_dev_put(mc->idev);
 846		kfree(mc);
 847	}
 848}
 849
 850static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
 851				   const struct in6_addr *addr,
 852				   unsigned int mode)
 853{
 854	struct ifmcaddr6 *mc;
 855
 856	mc = kzalloc(sizeof(*mc), GFP_ATOMIC);
 857	if (!mc)
 858		return NULL;
 859
 860	timer_setup(&mc->mca_timer, igmp6_timer_handler, 0);
 861
 862	mc->mca_addr = *addr;
 863	mc->idev = idev; /* reference taken by caller */
 864	mc->mca_users = 1;
 865	/* mca_stamp should be updated upon changes */
 866	mc->mca_cstamp = mc->mca_tstamp = jiffies;
 867	refcount_set(&mc->mca_refcnt, 1);
 868	spin_lock_init(&mc->mca_lock);
 869
 870	mc->mca_sfmode = mode;
 871	mc->mca_sfcount[mode] = 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	return mc;
 878}
 879
 880/*
 881 *	device multicast group inc (add if not found)
 882 */
 883static int __ipv6_dev_mc_inc(struct net_device *dev,
 884			     const struct in6_addr *addr, unsigned int mode)
 885{
 886	struct ifmcaddr6 *mc;
 887	struct inet6_dev *idev;
 888
 889	ASSERT_RTNL();
 890
 891	/* we need to take a reference on idev */
 892	idev = in6_dev_get(dev);
 893
 894	if (!idev)
 895		return -EINVAL;
 896
 897	write_lock_bh(&idev->lock);
 898	if (idev->dead) {
 899		write_unlock_bh(&idev->lock);
 900		in6_dev_put(idev);
 901		return -ENODEV;
 902	}
 903
 904	for (mc = idev->mc_list; mc; mc = mc->next) {
 905		if (ipv6_addr_equal(&mc->mca_addr, addr)) {
 906			mc->mca_users++;
 907			write_unlock_bh(&idev->lock);
 908			ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
 
 909			in6_dev_put(idev);
 910			return 0;
 911		}
 912	}
 913
 914	mc = mca_alloc(idev, addr, mode);
 915	if (!mc) {
 916		write_unlock_bh(&idev->lock);
 917		in6_dev_put(idev);
 918		return -ENOMEM;
 919	}
 920
 921	mc->next = idev->mc_list;
 922	idev->mc_list = mc;
 923
 924	/* Hold this for the code below before we unlock,
 925	 * it is already exposed via idev->mc_list.
 926	 */
 927	mca_get(mc);
 928	write_unlock_bh(&idev->lock);
 929
 930	mld_del_delrec(idev, mc);
 931	igmp6_group_added(mc);
 932	ma_put(mc);
 933	return 0;
 934}
 935
 936int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
 937{
 938	return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
 939}
 940EXPORT_SYMBOL(ipv6_dev_mc_inc);
 941
 942/*
 943 *	device multicast group del
 944 */
 945int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
 946{
 947	struct ifmcaddr6 *ma, **map;
 948
 949	ASSERT_RTNL();
 950
 951	write_lock_bh(&idev->lock);
 952	for (map = &idev->mc_list; (ma = *map) != NULL; map = &ma->next) {
 953		if (ipv6_addr_equal(&ma->mca_addr, addr)) {
 954			if (--ma->mca_users == 0) {
 955				*map = ma->next;
 956				write_unlock_bh(&idev->lock);
 957
 958				igmp6_group_dropped(ma);
 959				ip6_mc_clear_src(ma);
 960
 961				ma_put(ma);
 962				return 0;
 963			}
 964			write_unlock_bh(&idev->lock);
 965			return 0;
 966		}
 967	}
 968	write_unlock_bh(&idev->lock);
 969
 970	return -ENOENT;
 971}
 972
 973int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
 974{
 975	struct inet6_dev *idev;
 976	int err;
 977
 978	ASSERT_RTNL();
 979
 980	idev = __in6_dev_get(dev);
 981	if (!idev)
 982		err = -ENODEV;
 983	else
 984		err = __ipv6_dev_mc_dec(idev, addr);
 985
 986	return err;
 987}
 988EXPORT_SYMBOL(ipv6_dev_mc_dec);
 989
 990/*
 991 *	check if the interface/address pair is valid
 992 */
 993bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
 994			 const struct in6_addr *src_addr)
 995{
 996	struct inet6_dev *idev;
 997	struct ifmcaddr6 *mc;
 998	bool rv = false;
 999
1000	rcu_read_lock();
1001	idev = __in6_dev_get(dev);
1002	if (idev) {
1003		read_lock_bh(&idev->lock);
1004		for (mc = idev->mc_list; mc; mc = mc->next) {
1005			if (ipv6_addr_equal(&mc->mca_addr, group))
1006				break;
1007		}
1008		if (mc) {
1009			if (src_addr && !ipv6_addr_any(src_addr)) {
1010				struct ip6_sf_list *psf;
1011
1012				spin_lock_bh(&mc->mca_lock);
1013				for (psf = mc->mca_sources; psf; psf = psf->sf_next) {
1014					if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1015						break;
1016				}
1017				if (psf)
1018					rv = psf->sf_count[MCAST_INCLUDE] ||
1019						psf->sf_count[MCAST_EXCLUDE] !=
1020						mc->mca_sfcount[MCAST_EXCLUDE];
1021				else
1022					rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1023				spin_unlock_bh(&mc->mca_lock);
1024			} else
1025				rv = true; /* don't filter unspecified source */
1026		}
1027		read_unlock_bh(&idev->lock);
1028	}
1029	rcu_read_unlock();
1030	return rv;
1031}
1032
1033static void mld_gq_start_timer(struct inet6_dev *idev)
1034{
1035	unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1036
1037	idev->mc_gq_running = 1;
1038	if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2))
1039		in6_dev_hold(idev);
1040}
1041
1042static void mld_gq_stop_timer(struct inet6_dev *idev)
1043{
1044	idev->mc_gq_running = 0;
1045	if (del_timer(&idev->mc_gq_timer))
1046		__in6_dev_put(idev);
1047}
1048
1049static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay)
1050{
1051	unsigned long tv = prandom_u32() % delay;
1052
1053	if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2))
1054		in6_dev_hold(idev);
1055}
1056
1057static void mld_ifc_stop_timer(struct inet6_dev *idev)
1058{
1059	idev->mc_ifc_count = 0;
1060	if (del_timer(&idev->mc_ifc_timer))
1061		__in6_dev_put(idev);
1062}
1063
1064static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay)
1065{
1066	unsigned long tv = prandom_u32() % delay;
1067
1068	if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2))
1069		in6_dev_hold(idev);
1070}
1071
1072static void mld_dad_stop_timer(struct inet6_dev *idev)
1073{
1074	if (del_timer(&idev->mc_dad_timer))
1075		__in6_dev_put(idev);
1076}
1077
1078/*
1079 *	IGMP handling (alias multicast ICMPv6 messages)
1080 */
1081
1082static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1083{
1084	unsigned long delay = resptime;
1085
1086	/* Do not start timer for these addresses */
1087	if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1088	    IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1089		return;
1090
1091	if (del_timer(&ma->mca_timer)) {
1092		refcount_dec(&ma->mca_refcnt);
1093		delay = ma->mca_timer.expires - jiffies;
1094	}
1095
1096	if (delay >= resptime)
1097		delay = prandom_u32() % resptime;
1098
1099	ma->mca_timer.expires = jiffies + delay;
1100	if (!mod_timer(&ma->mca_timer, jiffies + delay))
1101		refcount_inc(&ma->mca_refcnt);
1102	ma->mca_flags |= MAF_TIMER_RUNNING;
1103}
1104
1105/* mark EXCLUDE-mode sources */
1106static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1107			     const struct in6_addr *srcs)
1108{
1109	struct ip6_sf_list *psf;
1110	int i, scount;
1111
1112	scount = 0;
1113	for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1114		if (scount == nsrcs)
1115			break;
1116		for (i = 0; i < nsrcs; i++) {
1117			/* skip inactive filters */
1118			if (psf->sf_count[MCAST_INCLUDE] ||
1119			    pmc->mca_sfcount[MCAST_EXCLUDE] !=
1120			    psf->sf_count[MCAST_EXCLUDE])
1121				break;
1122			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1123				scount++;
1124				break;
1125			}
1126		}
1127	}
1128	pmc->mca_flags &= ~MAF_GSQUERY;
1129	if (scount == nsrcs)	/* all sources excluded */
1130		return false;
1131	return true;
1132}
1133
1134static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1135			    const struct in6_addr *srcs)
1136{
1137	struct ip6_sf_list *psf;
1138	int i, scount;
1139
1140	if (pmc->mca_sfmode == MCAST_EXCLUDE)
1141		return mld_xmarksources(pmc, nsrcs, srcs);
1142
1143	/* mark INCLUDE-mode sources */
1144
1145	scount = 0;
1146	for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1147		if (scount == nsrcs)
1148			break;
1149		for (i = 0; i < nsrcs; i++) {
1150			if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1151				psf->sf_gsresp = 1;
1152				scount++;
1153				break;
1154			}
1155		}
1156	}
1157	if (!scount) {
1158		pmc->mca_flags &= ~MAF_GSQUERY;
1159		return false;
1160	}
1161	pmc->mca_flags |= MAF_GSQUERY;
1162	return true;
1163}
1164
1165static int mld_force_mld_version(const struct inet6_dev *idev)
1166{
1167	/* Normally, both are 0 here. If enforcement to a particular is
1168	 * being used, individual device enforcement will have a lower
1169	 * precedence over 'all' device (.../conf/all/force_mld_version).
1170	 */
1171
1172	if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1173		return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1174	else
1175		return idev->cnf.force_mld_version;
1176}
1177
1178static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1179{
1180	return mld_force_mld_version(idev) == 2;
1181}
1182
1183static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1184{
1185	return mld_force_mld_version(idev) == 1;
1186}
1187
1188static bool mld_in_v1_mode(const struct inet6_dev *idev)
1189{
1190	if (mld_in_v2_mode_only(idev))
1191		return false;
1192	if (mld_in_v1_mode_only(idev))
1193		return true;
1194	if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1195		return true;
1196
1197	return false;
1198}
1199
1200static void mld_set_v1_mode(struct inet6_dev *idev)
1201{
1202	/* RFC3810, relevant sections:
1203	 *  - 9.1. Robustness Variable
1204	 *  - 9.2. Query Interval
1205	 *  - 9.3. Query Response Interval
1206	 *  - 9.12. Older Version Querier Present Timeout
1207	 */
1208	unsigned long switchback;
1209
1210	switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1211
1212	idev->mc_v1_seen = jiffies + switchback;
1213}
1214
1215static void mld_update_qrv(struct inet6_dev *idev,
1216			   const struct mld2_query *mlh2)
1217{
1218	/* RFC3810, relevant sections:
1219	 *  - 5.1.8. QRV (Querier's Robustness Variable)
1220	 *  - 9.1. Robustness Variable
1221	 */
1222
1223	/* The value of the Robustness Variable MUST NOT be zero,
1224	 * and SHOULD NOT be one. Catch this here if we ever run
1225	 * into such a case in future.
1226	 */
1227	const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1228	WARN_ON(idev->mc_qrv == 0);
1229
1230	if (mlh2->mld2q_qrv > 0)
1231		idev->mc_qrv = mlh2->mld2q_qrv;
1232
1233	if (unlikely(idev->mc_qrv < min_qrv)) {
1234		net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1235				     idev->mc_qrv, min_qrv);
1236		idev->mc_qrv = min_qrv;
1237	}
1238}
1239
1240static void mld_update_qi(struct inet6_dev *idev,
1241			  const struct mld2_query *mlh2)
1242{
1243	/* RFC3810, relevant sections:
1244	 *  - 5.1.9. QQIC (Querier's Query Interval Code)
1245	 *  - 9.2. Query Interval
1246	 *  - 9.12. Older Version Querier Present Timeout
1247	 *    (the [Query Interval] in the last Query received)
1248	 */
1249	unsigned long mc_qqi;
1250
1251	if (mlh2->mld2q_qqic < 128) {
1252		mc_qqi = mlh2->mld2q_qqic;
1253	} else {
1254		unsigned long mc_man, mc_exp;
1255
1256		mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1257		mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1258
1259		mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1260	}
1261
1262	idev->mc_qi = mc_qqi * HZ;
1263}
1264
1265static void mld_update_qri(struct inet6_dev *idev,
1266			   const struct mld2_query *mlh2)
1267{
1268	/* RFC3810, relevant sections:
1269	 *  - 5.1.3. Maximum Response Code
1270	 *  - 9.3. Query Response Interval
1271	 */
1272	idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1273}
1274
1275static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1276			  unsigned long *max_delay, bool v1_query)
1277{
1278	unsigned long mldv1_md;
1279
1280	/* Ignore v1 queries */
1281	if (mld_in_v2_mode_only(idev))
1282		return -EINVAL;
1283
1284	mldv1_md = ntohs(mld->mld_maxdelay);
1285
1286	/* When in MLDv1 fallback and a MLDv2 router start-up being
1287	 * unaware of current MLDv1 operation, the MRC == MRD mapping
1288	 * only works when the exponential algorithm is not being
1289	 * used (as MLDv1 is unaware of such things).
1290	 *
1291	 * According to the RFC author, the MLDv2 implementations
1292	 * he's aware of all use a MRC < 32768 on start up queries.
1293	 *
1294	 * Thus, should we *ever* encounter something else larger
1295	 * than that, just assume the maximum possible within our
1296	 * reach.
1297	 */
1298	if (!v1_query)
1299		mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1300
1301	*max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1302
1303	/* MLDv1 router present: we need to go into v1 mode *only*
1304	 * when an MLDv1 query is received as per section 9.12. of
1305	 * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1306	 * queries MUST be of exactly 24 octets.
1307	 */
1308	if (v1_query)
1309		mld_set_v1_mode(idev);
1310
1311	/* cancel MLDv2 report timer */
1312	mld_gq_stop_timer(idev);
1313	/* cancel the interface change timer */
1314	mld_ifc_stop_timer(idev);
1315	/* clear deleted report items */
1316	mld_clear_delrec(idev);
1317
1318	return 0;
1319}
1320
1321static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1322			  unsigned long *max_delay)
1323{
1324	*max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1325
1326	mld_update_qrv(idev, mld);
1327	mld_update_qi(idev, mld);
1328	mld_update_qri(idev, mld);
1329
1330	idev->mc_maxdelay = *max_delay;
1331
1332	return 0;
1333}
1334
1335/* called with rcu_read_lock() */
1336int igmp6_event_query(struct sk_buff *skb)
1337{
1338	struct mld2_query *mlh2 = NULL;
1339	struct ifmcaddr6 *ma;
1340	const struct in6_addr *group;
1341	unsigned long max_delay;
1342	struct inet6_dev *idev;
1343	struct mld_msg *mld;
1344	int group_type;
1345	int mark = 0;
1346	int len, err;
1347
1348	if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1349		return -EINVAL;
1350
1351	/* compute payload length excluding extension headers */
1352	len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1353	len -= skb_network_header_len(skb);
1354
1355	/* RFC3810 6.2
1356	 * Upon reception of an MLD message that contains a Query, the node
1357	 * checks if the source address of the message is a valid link-local
1358	 * address, if the Hop Limit is set to 1, and if the Router Alert
1359	 * option is present in the Hop-By-Hop Options header of the IPv6
1360	 * packet.  If any of these checks fails, the packet is dropped.
1361	 */
1362	if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1363	    ipv6_hdr(skb)->hop_limit != 1 ||
1364	    !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1365	    IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1366		return -EINVAL;
1367
1368	idev = __in6_dev_get(skb->dev);
1369	if (!idev)
1370		return 0;
1371
1372	mld = (struct mld_msg *)icmp6_hdr(skb);
1373	group = &mld->mld_mca;
1374	group_type = ipv6_addr_type(group);
1375
1376	if (group_type != IPV6_ADDR_ANY &&
1377	    !(group_type&IPV6_ADDR_MULTICAST))
1378		return -EINVAL;
1379
1380	if (len < MLD_V1_QUERY_LEN) {
1381		return -EINVAL;
1382	} else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1383		err = mld_process_v1(idev, mld, &max_delay,
1384				     len == MLD_V1_QUERY_LEN);
1385		if (err < 0)
1386			return err;
1387	} else if (len >= MLD_V2_QUERY_LEN_MIN) {
1388		int srcs_offset = sizeof(struct mld2_query) -
1389				  sizeof(struct icmp6hdr);
1390
1391		if (!pskb_may_pull(skb, srcs_offset))
1392			return -EINVAL;
1393
1394		mlh2 = (struct mld2_query *)skb_transport_header(skb);
1395
1396		err = mld_process_v2(idev, mlh2, &max_delay);
1397		if (err < 0)
1398			return err;
1399
1400		if (group_type == IPV6_ADDR_ANY) { /* general query */
1401			if (mlh2->mld2q_nsrcs)
1402				return -EINVAL; /* no sources allowed */
1403
1404			mld_gq_start_timer(idev);
1405			return 0;
1406		}
1407		/* mark sources to include, if group & source-specific */
1408		if (mlh2->mld2q_nsrcs != 0) {
1409			if (!pskb_may_pull(skb, srcs_offset +
1410			    ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1411				return -EINVAL;
1412
1413			mlh2 = (struct mld2_query *)skb_transport_header(skb);
1414			mark = 1;
1415		}
1416	} else {
1417		return -EINVAL;
1418	}
1419
1420	read_lock_bh(&idev->lock);
1421	if (group_type == IPV6_ADDR_ANY) {
1422		for (ma = idev->mc_list; ma; ma = ma->next) {
1423			spin_lock_bh(&ma->mca_lock);
1424			igmp6_group_queried(ma, max_delay);
1425			spin_unlock_bh(&ma->mca_lock);
1426		}
1427	} else {
1428		for (ma = idev->mc_list; ma; ma = ma->next) {
1429			if (!ipv6_addr_equal(group, &ma->mca_addr))
1430				continue;
1431			spin_lock_bh(&ma->mca_lock);
1432			if (ma->mca_flags & MAF_TIMER_RUNNING) {
1433				/* gsquery <- gsquery && mark */
1434				if (!mark)
1435					ma->mca_flags &= ~MAF_GSQUERY;
1436			} else {
1437				/* gsquery <- mark */
1438				if (mark)
1439					ma->mca_flags |= MAF_GSQUERY;
1440				else
1441					ma->mca_flags &= ~MAF_GSQUERY;
1442			}
1443			if (!(ma->mca_flags & MAF_GSQUERY) ||
1444			    mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1445				igmp6_group_queried(ma, max_delay);
1446			spin_unlock_bh(&ma->mca_lock);
1447			break;
1448		}
1449	}
1450	read_unlock_bh(&idev->lock);
1451
1452	return 0;
1453}
1454
1455/* called with rcu_read_lock() */
1456int igmp6_event_report(struct sk_buff *skb)
1457{
1458	struct ifmcaddr6 *ma;
1459	struct inet6_dev *idev;
1460	struct mld_msg *mld;
1461	int addr_type;
1462
1463	/* Our own report looped back. Ignore it. */
1464	if (skb->pkt_type == PACKET_LOOPBACK)
1465		return 0;
1466
1467	/* send our report if the MC router may not have heard this report */
1468	if (skb->pkt_type != PACKET_MULTICAST &&
1469	    skb->pkt_type != PACKET_BROADCAST)
1470		return 0;
1471
1472	if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1473		return -EINVAL;
1474
1475	mld = (struct mld_msg *)icmp6_hdr(skb);
1476
1477	/* Drop reports with not link local source */
1478	addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1479	if (addr_type != IPV6_ADDR_ANY &&
1480	    !(addr_type&IPV6_ADDR_LINKLOCAL))
1481		return -EINVAL;
1482
1483	idev = __in6_dev_get(skb->dev);
1484	if (!idev)
1485		return -ENODEV;
1486
1487	/*
1488	 *	Cancel the timer for this group
1489	 */
1490
1491	read_lock_bh(&idev->lock);
1492	for (ma = idev->mc_list; ma; ma = ma->next) {
1493		if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1494			spin_lock(&ma->mca_lock);
1495			if (del_timer(&ma->mca_timer))
1496				refcount_dec(&ma->mca_refcnt);
1497			ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING);
1498			spin_unlock(&ma->mca_lock);
1499			break;
1500		}
1501	}
1502	read_unlock_bh(&idev->lock);
1503	return 0;
1504}
1505
1506static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1507		  int gdeleted, int sdeleted)
1508{
1509	switch (type) {
1510	case MLD2_MODE_IS_INCLUDE:
1511	case MLD2_MODE_IS_EXCLUDE:
1512		if (gdeleted || sdeleted)
1513			return false;
1514		if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1515			if (pmc->mca_sfmode == MCAST_INCLUDE)
1516				return true;
1517			/* don't include if this source is excluded
1518			 * in all filters
1519			 */
1520			if (psf->sf_count[MCAST_INCLUDE])
1521				return type == MLD2_MODE_IS_INCLUDE;
1522			return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1523				psf->sf_count[MCAST_EXCLUDE];
1524		}
1525		return false;
1526	case MLD2_CHANGE_TO_INCLUDE:
1527		if (gdeleted || sdeleted)
1528			return false;
1529		return psf->sf_count[MCAST_INCLUDE] != 0;
1530	case MLD2_CHANGE_TO_EXCLUDE:
1531		if (gdeleted || sdeleted)
1532			return false;
1533		if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1534		    psf->sf_count[MCAST_INCLUDE])
1535			return false;
1536		return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1537			psf->sf_count[MCAST_EXCLUDE];
1538	case MLD2_ALLOW_NEW_SOURCES:
1539		if (gdeleted || !psf->sf_crcount)
1540			return false;
1541		return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1542	case MLD2_BLOCK_OLD_SOURCES:
1543		if (pmc->mca_sfmode == MCAST_INCLUDE)
1544			return gdeleted || (psf->sf_crcount && sdeleted);
1545		return psf->sf_crcount && !gdeleted && !sdeleted;
1546	}
1547	return false;
1548}
1549
1550static int
1551mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1552{
1553	struct ip6_sf_list *psf;
1554	int scount = 0;
1555
1556	for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
1557		if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1558			continue;
1559		scount++;
1560	}
1561	return scount;
1562}
1563
1564static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1565		       struct net_device *dev,
1566		       const struct in6_addr *saddr,
1567		       const struct in6_addr *daddr,
1568		       int proto, int len)
1569{
1570	struct ipv6hdr *hdr;
1571
1572	skb->protocol = htons(ETH_P_IPV6);
1573	skb->dev = dev;
1574
1575	skb_reset_network_header(skb);
1576	skb_put(skb, sizeof(struct ipv6hdr));
1577	hdr = ipv6_hdr(skb);
1578
1579	ip6_flow_hdr(hdr, 0, 0);
1580
1581	hdr->payload_len = htons(len);
1582	hdr->nexthdr = proto;
1583	hdr->hop_limit = inet6_sk(sk)->hop_limit;
1584
1585	hdr->saddr = *saddr;
1586	hdr->daddr = *daddr;
1587}
1588
1589static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1590{
1591	struct net_device *dev = idev->dev;
1592	struct net *net = dev_net(dev);
1593	struct sock *sk = net->ipv6.igmp_sk;
1594	struct sk_buff *skb;
1595	struct mld2_report *pmr;
1596	struct in6_addr addr_buf;
1597	const struct in6_addr *saddr;
1598	int hlen = LL_RESERVED_SPACE(dev);
1599	int tlen = dev->needed_tailroom;
1600	unsigned int size = mtu + hlen + tlen;
1601	int err;
1602	u8 ra[8] = { IPPROTO_ICMPV6, 0,
1603		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1604		     IPV6_TLV_PADN, 0 };
1605
1606	/* we assume size > sizeof(ra) here */
1607	/* limit our allocations to order-0 page */
1608	size = min_t(int, size, SKB_MAX_ORDER(0, 0));
1609	skb = sock_alloc_send_skb(sk, size, 1, &err);
1610
1611	if (!skb)
1612		return NULL;
1613
1614	skb->priority = TC_PRIO_CONTROL;
1615	skb_reserve(skb, hlen);
1616	skb_tailroom_reserve(skb, mtu, tlen);
1617
1618	if (__ipv6_get_lladdr(idev, &addr_buf, IFA_F_TENTATIVE)) {
1619		/* <draft-ietf-magma-mld-source-05.txt>:
1620		 * use unspecified address as the source address
1621		 * when a valid link-local address is not available.
1622		 */
1623		saddr = &in6addr_any;
1624	} else
1625		saddr = &addr_buf;
1626
1627	ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1628
1629	skb_put_data(skb, ra, sizeof(ra));
1630
1631	skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1632	skb_put(skb, sizeof(*pmr));
1633	pmr = (struct mld2_report *)skb_transport_header(skb);
1634	pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1635	pmr->mld2r_resv1 = 0;
1636	pmr->mld2r_cksum = 0;
1637	pmr->mld2r_resv2 = 0;
1638	pmr->mld2r_ngrec = 0;
1639	return skb;
1640}
1641
1642static void mld_sendpack(struct sk_buff *skb)
1643{
1644	struct ipv6hdr *pip6 = ipv6_hdr(skb);
1645	struct mld2_report *pmr =
1646			      (struct mld2_report *)skb_transport_header(skb);
1647	int payload_len, mldlen;
1648	struct inet6_dev *idev;
1649	struct net *net = dev_net(skb->dev);
1650	int err;
1651	struct flowi6 fl6;
1652	struct dst_entry *dst;
1653
1654	rcu_read_lock();
1655	idev = __in6_dev_get(skb->dev);
1656	IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1657
1658	payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1659		sizeof(*pip6);
1660	mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1661	pip6->payload_len = htons(payload_len);
1662
1663	pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1664					   IPPROTO_ICMPV6,
1665					   csum_partial(skb_transport_header(skb),
1666							mldlen, 0));
1667
1668	icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1669			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1670			 skb->dev->ifindex);
1671	dst = icmp6_dst_alloc(skb->dev, &fl6);
1672
1673	err = 0;
1674	if (IS_ERR(dst)) {
1675		err = PTR_ERR(dst);
1676		dst = NULL;
1677	}
1678	skb_dst_set(skb, dst);
1679	if (err)
1680		goto err_out;
1681
1682	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1683		      net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1684		      dst_output);
1685out:
1686	if (!err) {
1687		ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1688		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1689	} else {
1690		IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1691	}
1692
1693	rcu_read_unlock();
1694	return;
1695
1696err_out:
1697	kfree_skb(skb);
1698	goto out;
1699}
1700
1701static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1702{
1703	return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1704}
1705
1706static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1707	int type, struct mld2_grec **ppgr, unsigned int mtu)
1708{
1709	struct mld2_report *pmr;
1710	struct mld2_grec *pgr;
1711
1712	if (!skb) {
1713		skb = mld_newpack(pmc->idev, mtu);
1714		if (!skb)
1715			return NULL;
1716	}
1717	pgr = skb_put(skb, sizeof(struct mld2_grec));
1718	pgr->grec_type = type;
1719	pgr->grec_auxwords = 0;
1720	pgr->grec_nsrcs = 0;
1721	pgr->grec_mca = pmc->mca_addr;	/* structure copy */
1722	pmr = (struct mld2_report *)skb_transport_header(skb);
1723	pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1724	*ppgr = pgr;
1725	return skb;
1726}
1727
1728#define AVAILABLE(skb)	((skb) ? skb_availroom(skb) : 0)
1729
1730static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1731	int type, int gdeleted, int sdeleted, int crsend)
1732{
1733	struct inet6_dev *idev = pmc->idev;
1734	struct net_device *dev = idev->dev;
1735	struct mld2_report *pmr;
1736	struct mld2_grec *pgr = NULL;
1737	struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
1738	int scount, stotal, first, isquery, truncate;
1739	unsigned int mtu;
1740
1741	if (pmc->mca_flags & MAF_NOREPORT)
1742		return skb;
1743
1744	mtu = READ_ONCE(dev->mtu);
1745	if (mtu < IPV6_MIN_MTU)
1746		return skb;
1747
1748	isquery = type == MLD2_MODE_IS_INCLUDE ||
1749		  type == MLD2_MODE_IS_EXCLUDE;
1750	truncate = type == MLD2_MODE_IS_EXCLUDE ||
1751		    type == MLD2_CHANGE_TO_EXCLUDE;
1752
1753	stotal = scount = 0;
1754
1755	psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1756
1757	if (!*psf_list)
1758		goto empty_source;
1759
1760	pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1761
1762	/* EX and TO_EX get a fresh packet, if needed */
1763	if (truncate) {
1764		if (pmr && pmr->mld2r_ngrec &&
1765		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1766			if (skb)
1767				mld_sendpack(skb);
1768			skb = mld_newpack(idev, mtu);
1769		}
1770	}
1771	first = 1;
1772	psf_prev = NULL;
1773	for (psf = *psf_list; psf; psf = psf_next) {
1774		struct in6_addr *psrc;
1775
1776		psf_next = psf->sf_next;
1777
1778		if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1779			psf_prev = psf;
1780			continue;
1781		}
1782
1783		/* Based on RFC3810 6.1. Should not send source-list change
1784		 * records when there is a filter mode change.
1785		 */
1786		if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1787		     (!gdeleted && pmc->mca_crcount)) &&
1788		    (type == MLD2_ALLOW_NEW_SOURCES ||
1789		     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1790			goto decrease_sf_crcount;
1791
1792		/* clear marks on query responses */
1793		if (isquery)
1794			psf->sf_gsresp = 0;
1795
1796		if (AVAILABLE(skb) < sizeof(*psrc) +
1797		    first*sizeof(struct mld2_grec)) {
1798			if (truncate && !first)
1799				break;	 /* truncate these */
1800			if (pgr)
1801				pgr->grec_nsrcs = htons(scount);
1802			if (skb)
1803				mld_sendpack(skb);
1804			skb = mld_newpack(idev, mtu);
1805			first = 1;
1806			scount = 0;
1807		}
1808		if (first) {
1809			skb = add_grhead(skb, pmc, type, &pgr, mtu);
1810			first = 0;
1811		}
1812		if (!skb)
1813			return NULL;
1814		psrc = skb_put(skb, sizeof(*psrc));
1815		*psrc = psf->sf_addr;
1816		scount++; stotal++;
1817		if ((type == MLD2_ALLOW_NEW_SOURCES ||
1818		     type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1819decrease_sf_crcount:
1820			psf->sf_crcount--;
1821			if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1822				if (psf_prev)
1823					psf_prev->sf_next = psf->sf_next;
1824				else
1825					*psf_list = psf->sf_next;
1826				kfree(psf);
1827				continue;
1828			}
1829		}
1830		psf_prev = psf;
1831	}
1832
1833empty_source:
1834	if (!stotal) {
1835		if (type == MLD2_ALLOW_NEW_SOURCES ||
1836		    type == MLD2_BLOCK_OLD_SOURCES)
1837			return skb;
1838		if (pmc->mca_crcount || isquery || crsend) {
1839			/* make sure we have room for group header */
1840			if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1841				mld_sendpack(skb);
1842				skb = NULL; /* add_grhead will get a new one */
1843			}
1844			skb = add_grhead(skb, pmc, type, &pgr, mtu);
1845		}
1846	}
1847	if (pgr)
1848		pgr->grec_nsrcs = htons(scount);
1849
1850	if (isquery)
1851		pmc->mca_flags &= ~MAF_GSQUERY;	/* clear query state */
1852	return skb;
1853}
1854
1855static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
1856{
1857	struct sk_buff *skb = NULL;
1858	int type;
1859
1860	read_lock_bh(&idev->lock);
1861	if (!pmc) {
1862		for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1863			if (pmc->mca_flags & MAF_NOREPORT)
1864				continue;
1865			spin_lock_bh(&pmc->mca_lock);
1866			if (pmc->mca_sfcount[MCAST_EXCLUDE])
1867				type = MLD2_MODE_IS_EXCLUDE;
1868			else
1869				type = MLD2_MODE_IS_INCLUDE;
1870			skb = add_grec(skb, pmc, type, 0, 0, 0);
1871			spin_unlock_bh(&pmc->mca_lock);
1872		}
1873	} else {
1874		spin_lock_bh(&pmc->mca_lock);
1875		if (pmc->mca_sfcount[MCAST_EXCLUDE])
1876			type = MLD2_MODE_IS_EXCLUDE;
1877		else
1878			type = MLD2_MODE_IS_INCLUDE;
1879		skb = add_grec(skb, pmc, type, 0, 0, 0);
1880		spin_unlock_bh(&pmc->mca_lock);
1881	}
1882	read_unlock_bh(&idev->lock);
1883	if (skb)
1884		mld_sendpack(skb);
1885}
1886
1887/*
1888 * remove zero-count source records from a source filter list
1889 */
1890static void mld_clear_zeros(struct ip6_sf_list **ppsf)
1891{
1892	struct ip6_sf_list *psf_prev, *psf_next, *psf;
1893
1894	psf_prev = NULL;
1895	for (psf = *ppsf; psf; psf = psf_next) {
1896		psf_next = psf->sf_next;
1897		if (psf->sf_crcount == 0) {
1898			if (psf_prev)
1899				psf_prev->sf_next = psf->sf_next;
1900			else
1901				*ppsf = psf->sf_next;
1902			kfree(psf);
1903		} else
1904			psf_prev = psf;
1905	}
1906}
1907
1908static void mld_send_cr(struct inet6_dev *idev)
1909{
1910	struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
1911	struct sk_buff *skb = NULL;
1912	int type, dtype;
1913
1914	read_lock_bh(&idev->lock);
1915	spin_lock(&idev->mc_lock);
1916
1917	/* deleted MCA's */
1918	pmc_prev = NULL;
1919	for (pmc = idev->mc_tomb; pmc; pmc = pmc_next) {
1920		pmc_next = pmc->next;
1921		if (pmc->mca_sfmode == MCAST_INCLUDE) {
1922			type = MLD2_BLOCK_OLD_SOURCES;
1923			dtype = MLD2_BLOCK_OLD_SOURCES;
1924			skb = add_grec(skb, pmc, type, 1, 0, 0);
1925			skb = add_grec(skb, pmc, dtype, 1, 1, 0);
1926		}
1927		if (pmc->mca_crcount) {
1928			if (pmc->mca_sfmode == MCAST_EXCLUDE) {
1929				type = MLD2_CHANGE_TO_INCLUDE;
1930				skb = add_grec(skb, pmc, type, 1, 0, 0);
1931			}
1932			pmc->mca_crcount--;
1933			if (pmc->mca_crcount == 0) {
1934				mld_clear_zeros(&pmc->mca_tomb);
1935				mld_clear_zeros(&pmc->mca_sources);
1936			}
1937		}
1938		if (pmc->mca_crcount == 0 && !pmc->mca_tomb &&
1939		    !pmc->mca_sources) {
1940			if (pmc_prev)
1941				pmc_prev->next = pmc_next;
1942			else
1943				idev->mc_tomb = pmc_next;
1944			in6_dev_put(pmc->idev);
1945			kfree(pmc);
1946		} else
1947			pmc_prev = pmc;
1948	}
1949	spin_unlock(&idev->mc_lock);
1950
1951	/* change recs */
1952	for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
1953		spin_lock_bh(&pmc->mca_lock);
1954		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
1955			type = MLD2_BLOCK_OLD_SOURCES;
1956			dtype = MLD2_ALLOW_NEW_SOURCES;
1957		} else {
1958			type = MLD2_ALLOW_NEW_SOURCES;
1959			dtype = MLD2_BLOCK_OLD_SOURCES;
1960		}
1961		skb = add_grec(skb, pmc, type, 0, 0, 0);
1962		skb = add_grec(skb, pmc, dtype, 0, 1, 0);	/* deleted sources */
1963
1964		/* filter mode changes */
1965		if (pmc->mca_crcount) {
1966			if (pmc->mca_sfmode == MCAST_EXCLUDE)
1967				type = MLD2_CHANGE_TO_EXCLUDE;
1968			else
1969				type = MLD2_CHANGE_TO_INCLUDE;
1970			skb = add_grec(skb, pmc, type, 0, 0, 0);
1971			pmc->mca_crcount--;
1972		}
1973		spin_unlock_bh(&pmc->mca_lock);
1974	}
1975	read_unlock_bh(&idev->lock);
1976	if (!skb)
1977		return;
1978	(void) mld_sendpack(skb);
1979}
1980
1981static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
1982{
1983	struct net *net = dev_net(dev);
1984	struct sock *sk = net->ipv6.igmp_sk;
1985	struct inet6_dev *idev;
1986	struct sk_buff *skb;
1987	struct mld_msg *hdr;
1988	const struct in6_addr *snd_addr, *saddr;
1989	struct in6_addr addr_buf;
1990	int hlen = LL_RESERVED_SPACE(dev);
1991	int tlen = dev->needed_tailroom;
1992	int err, len, payload_len, full_len;
1993	u8 ra[8] = { IPPROTO_ICMPV6, 0,
1994		     IPV6_TLV_ROUTERALERT, 2, 0, 0,
1995		     IPV6_TLV_PADN, 0 };
1996	struct flowi6 fl6;
1997	struct dst_entry *dst;
1998
1999	if (type == ICMPV6_MGM_REDUCTION)
2000		snd_addr = &in6addr_linklocal_allrouters;
2001	else
2002		snd_addr = addr;
2003
2004	len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2005	payload_len = len + sizeof(ra);
2006	full_len = sizeof(struct ipv6hdr) + payload_len;
2007
2008	rcu_read_lock();
2009	IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2010		      IPSTATS_MIB_OUT, full_len);
2011	rcu_read_unlock();
2012
2013	skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2014
2015	if (!skb) {
2016		rcu_read_lock();
2017		IP6_INC_STATS(net, __in6_dev_get(dev),
2018			      IPSTATS_MIB_OUTDISCARDS);
2019		rcu_read_unlock();
2020		return;
2021	}
2022	skb->priority = TC_PRIO_CONTROL;
2023	skb_reserve(skb, hlen);
2024
2025	if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2026		/* <draft-ietf-magma-mld-source-05.txt>:
2027		 * use unspecified address as the source address
2028		 * when a valid link-local address is not available.
2029		 */
2030		saddr = &in6addr_any;
2031	} else
2032		saddr = &addr_buf;
2033
2034	ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2035
2036	skb_put_data(skb, ra, sizeof(ra));
2037
2038	hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2039	hdr->mld_type = type;
2040	hdr->mld_mca = *addr;
2041
2042	hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2043					 IPPROTO_ICMPV6,
2044					 csum_partial(hdr, len, 0));
2045
2046	rcu_read_lock();
2047	idev = __in6_dev_get(skb->dev);
2048
2049	icmpv6_flow_init(sk, &fl6, type,
2050			 &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2051			 skb->dev->ifindex);
2052	dst = icmp6_dst_alloc(skb->dev, &fl6);
2053	if (IS_ERR(dst)) {
2054		err = PTR_ERR(dst);
2055		goto err_out;
2056	}
2057
2058	skb_dst_set(skb, dst);
2059	err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2060		      net, sk, skb, NULL, skb->dev,
2061		      dst_output);
2062out:
2063	if (!err) {
2064		ICMP6MSGOUT_INC_STATS(net, idev, type);
2065		ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2066	} else
2067		IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2068
2069	rcu_read_unlock();
2070	return;
2071
2072err_out:
2073	kfree_skb(skb);
2074	goto out;
2075}
2076
2077static void mld_send_initial_cr(struct inet6_dev *idev)
2078{
2079	struct sk_buff *skb;
2080	struct ifmcaddr6 *pmc;
2081	int type;
2082
2083	if (mld_in_v1_mode(idev))
2084		return;
2085
2086	skb = NULL;
2087	read_lock_bh(&idev->lock);
2088	for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2089		spin_lock_bh(&pmc->mca_lock);
2090		if (pmc->mca_sfcount[MCAST_EXCLUDE])
2091			type = MLD2_CHANGE_TO_EXCLUDE;
2092		else
2093			type = MLD2_ALLOW_NEW_SOURCES;
2094		skb = add_grec(skb, pmc, type, 0, 0, 1);
2095		spin_unlock_bh(&pmc->mca_lock);
2096	}
2097	read_unlock_bh(&idev->lock);
2098	if (skb)
2099		mld_sendpack(skb);
2100}
2101
2102void ipv6_mc_dad_complete(struct inet6_dev *idev)
2103{
2104	idev->mc_dad_count = idev->mc_qrv;
2105	if (idev->mc_dad_count) {
2106		mld_send_initial_cr(idev);
2107		idev->mc_dad_count--;
2108		if (idev->mc_dad_count)
2109			mld_dad_start_timer(idev,
2110					    unsolicited_report_interval(idev));
2111	}
2112}
2113
2114static void mld_dad_timer_expire(struct timer_list *t)
2115{
2116	struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer);
2117
2118	mld_send_initial_cr(idev);
2119	if (idev->mc_dad_count) {
2120		idev->mc_dad_count--;
2121		if (idev->mc_dad_count)
2122			mld_dad_start_timer(idev,
2123					    unsolicited_report_interval(idev));
2124	}
2125	in6_dev_put(idev);
2126}
2127
2128static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2129	const struct in6_addr *psfsrc)
2130{
2131	struct ip6_sf_list *psf, *psf_prev;
2132	int rv = 0;
2133
2134	psf_prev = NULL;
2135	for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2136		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2137			break;
2138		psf_prev = psf;
2139	}
2140	if (!psf || psf->sf_count[sfmode] == 0) {
2141		/* source filter not found, or count wrong =>  bug */
2142		return -ESRCH;
2143	}
2144	psf->sf_count[sfmode]--;
2145	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2146		struct inet6_dev *idev = pmc->idev;
2147
2148		/* no more filters for this source */
2149		if (psf_prev)
2150			psf_prev->sf_next = psf->sf_next;
2151		else
2152			pmc->mca_sources = psf->sf_next;
2153		if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2154		    !mld_in_v1_mode(idev)) {
2155			psf->sf_crcount = idev->mc_qrv;
2156			psf->sf_next = pmc->mca_tomb;
2157			pmc->mca_tomb = psf;
2158			rv = 1;
2159		} else
2160			kfree(psf);
2161	}
2162	return rv;
2163}
2164
2165static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2166			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
2167			  int delta)
2168{
2169	struct ifmcaddr6 *pmc;
2170	int	changerec = 0;
2171	int	i, err;
2172
2173	if (!idev)
2174		return -ENODEV;
2175	read_lock_bh(&idev->lock);
2176	for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2177		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2178			break;
2179	}
2180	if (!pmc) {
2181		/* MCA not found?? bug */
2182		read_unlock_bh(&idev->lock);
2183		return -ESRCH;
2184	}
2185	spin_lock_bh(&pmc->mca_lock);
2186	sf_markstate(pmc);
2187	if (!delta) {
2188		if (!pmc->mca_sfcount[sfmode]) {
2189			spin_unlock_bh(&pmc->mca_lock);
2190			read_unlock_bh(&idev->lock);
2191			return -EINVAL;
2192		}
2193		pmc->mca_sfcount[sfmode]--;
2194	}
2195	err = 0;
2196	for (i = 0; i < sfcount; i++) {
2197		int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2198
2199		changerec |= rv > 0;
2200		if (!err && rv < 0)
2201			err = rv;
2202	}
2203	if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2204	    pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2205	    pmc->mca_sfcount[MCAST_INCLUDE]) {
2206		struct ip6_sf_list *psf;
2207
2208		/* filter mode change */
2209		pmc->mca_sfmode = MCAST_INCLUDE;
2210		pmc->mca_crcount = idev->mc_qrv;
2211		idev->mc_ifc_count = pmc->mca_crcount;
2212		for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2213			psf->sf_crcount = 0;
2214		mld_ifc_event(pmc->idev);
2215	} else if (sf_setstate(pmc) || changerec)
2216		mld_ifc_event(pmc->idev);
2217	spin_unlock_bh(&pmc->mca_lock);
2218	read_unlock_bh(&idev->lock);
2219	return err;
2220}
2221
2222/*
2223 * Add multicast single-source filter to the interface list
2224 */
2225static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2226	const struct in6_addr *psfsrc)
2227{
2228	struct ip6_sf_list *psf, *psf_prev;
2229
2230	psf_prev = NULL;
2231	for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2232		if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2233			break;
2234		psf_prev = psf;
2235	}
2236	if (!psf) {
2237		psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2238		if (!psf)
2239			return -ENOBUFS;
2240
2241		psf->sf_addr = *psfsrc;
2242		if (psf_prev) {
2243			psf_prev->sf_next = psf;
2244		} else
2245			pmc->mca_sources = psf;
2246	}
2247	psf->sf_count[sfmode]++;
2248	return 0;
2249}
2250
2251static void sf_markstate(struct ifmcaddr6 *pmc)
2252{
2253	struct ip6_sf_list *psf;
2254	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2255
2256	for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2257		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2258			psf->sf_oldin = mca_xcount ==
2259				psf->sf_count[MCAST_EXCLUDE] &&
2260				!psf->sf_count[MCAST_INCLUDE];
2261		} else
2262			psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2263}
2264
2265static int sf_setstate(struct ifmcaddr6 *pmc)
2266{
2267	struct ip6_sf_list *psf, *dpsf;
2268	int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2269	int qrv = pmc->idev->mc_qrv;
2270	int new_in, rv;
2271
2272	rv = 0;
2273	for (psf = pmc->mca_sources; psf; psf = psf->sf_next) {
2274		if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2275			new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2276				!psf->sf_count[MCAST_INCLUDE];
2277		} else
2278			new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2279		if (new_in) {
2280			if (!psf->sf_oldin) {
2281				struct ip6_sf_list *prev = NULL;
2282
2283				for (dpsf = pmc->mca_tomb; dpsf;
2284				     dpsf = dpsf->sf_next) {
2285					if (ipv6_addr_equal(&dpsf->sf_addr,
2286					    &psf->sf_addr))
2287						break;
2288					prev = dpsf;
2289				}
2290				if (dpsf) {
2291					if (prev)
2292						prev->sf_next = dpsf->sf_next;
2293					else
2294						pmc->mca_tomb = dpsf->sf_next;
2295					kfree(dpsf);
2296				}
2297				psf->sf_crcount = qrv;
2298				rv++;
2299			}
2300		} else if (psf->sf_oldin) {
2301			psf->sf_crcount = 0;
2302			/*
2303			 * add or update "delete" records if an active filter
2304			 * is now inactive
2305			 */
2306			for (dpsf = pmc->mca_tomb; dpsf; dpsf = dpsf->sf_next)
2307				if (ipv6_addr_equal(&dpsf->sf_addr,
2308				    &psf->sf_addr))
2309					break;
2310			if (!dpsf) {
2311				dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2312				if (!dpsf)
2313					continue;
2314				*dpsf = *psf;
2315				/* pmc->mca_lock held by callers */
2316				dpsf->sf_next = pmc->mca_tomb;
2317				pmc->mca_tomb = dpsf;
2318			}
2319			dpsf->sf_crcount = qrv;
2320			rv++;
2321		}
2322	}
2323	return rv;
2324}
2325
2326/*
2327 * Add multicast source filter list to the interface list
2328 */
2329static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2330			  int sfmode, int sfcount, const struct in6_addr *psfsrc,
2331			  int delta)
2332{
2333	struct ifmcaddr6 *pmc;
2334	int	isexclude;
2335	int	i, err;
2336
2337	if (!idev)
2338		return -ENODEV;
2339	read_lock_bh(&idev->lock);
2340	for (pmc = idev->mc_list; pmc; pmc = pmc->next) {
2341		if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2342			break;
2343	}
2344	if (!pmc) {
2345		/* MCA not found?? bug */
2346		read_unlock_bh(&idev->lock);
2347		return -ESRCH;
2348	}
2349	spin_lock_bh(&pmc->mca_lock);
2350
2351	sf_markstate(pmc);
2352	isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2353	if (!delta)
2354		pmc->mca_sfcount[sfmode]++;
2355	err = 0;
2356	for (i = 0; i < sfcount; i++) {
2357		err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2358		if (err)
2359			break;
2360	}
2361	if (err) {
2362		int j;
2363
2364		if (!delta)
2365			pmc->mca_sfcount[sfmode]--;
2366		for (j = 0; j < i; j++)
2367			ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2368	} else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2369		struct ip6_sf_list *psf;
2370
2371		/* filter mode change */
2372		if (pmc->mca_sfcount[MCAST_EXCLUDE])
2373			pmc->mca_sfmode = MCAST_EXCLUDE;
2374		else if (pmc->mca_sfcount[MCAST_INCLUDE])
2375			pmc->mca_sfmode = MCAST_INCLUDE;
2376		/* else no filters; keep old mode for reports */
2377
2378		pmc->mca_crcount = idev->mc_qrv;
2379		idev->mc_ifc_count = pmc->mca_crcount;
2380		for (psf = pmc->mca_sources; psf; psf = psf->sf_next)
2381			psf->sf_crcount = 0;
2382		mld_ifc_event(idev);
2383	} else if (sf_setstate(pmc))
2384		mld_ifc_event(idev);
2385	spin_unlock_bh(&pmc->mca_lock);
2386	read_unlock_bh(&idev->lock);
2387	return err;
2388}
2389
2390static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2391{
2392	struct ip6_sf_list *psf, *nextpsf;
2393
2394	for (psf = pmc->mca_tomb; psf; psf = nextpsf) {
2395		nextpsf = psf->sf_next;
2396		kfree(psf);
2397	}
2398	pmc->mca_tomb = NULL;
2399	for (psf = pmc->mca_sources; psf; psf = nextpsf) {
2400		nextpsf = psf->sf_next;
2401		kfree(psf);
2402	}
2403	pmc->mca_sources = NULL;
2404	pmc->mca_sfmode = MCAST_EXCLUDE;
2405	pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2406	pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2407}
2408
2409
2410static void igmp6_join_group(struct ifmcaddr6 *ma)
2411{
2412	unsigned long delay;
2413
2414	if (ma->mca_flags & MAF_NOREPORT)
2415		return;
2416
2417	igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2418
2419	delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2420
2421	spin_lock_bh(&ma->mca_lock);
2422	if (del_timer(&ma->mca_timer)) {
2423		refcount_dec(&ma->mca_refcnt);
2424		delay = ma->mca_timer.expires - jiffies;
2425	}
2426
2427	if (!mod_timer(&ma->mca_timer, jiffies + delay))
2428		refcount_inc(&ma->mca_refcnt);
2429	ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2430	spin_unlock_bh(&ma->mca_lock);
2431}
2432
2433static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2434			    struct inet6_dev *idev)
2435{
2436	int err;
2437
2438	write_lock_bh(&iml->sflock);
 
 
2439	if (!iml->sflist) {
2440		/* any-source empty exclude case */
2441		err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2442	} else {
2443		err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2444				iml->sflist->sl_count, iml->sflist->sl_addr, 0);
2445		sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max));
2446		iml->sflist = NULL;
2447	}
2448	write_unlock_bh(&iml->sflock);
 
 
 
2449	return err;
2450}
2451
2452static void igmp6_leave_group(struct ifmcaddr6 *ma)
2453{
2454	if (mld_in_v1_mode(ma->idev)) {
2455		if (ma->mca_flags & MAF_LAST_REPORTER)
2456			igmp6_send(&ma->mca_addr, ma->idev->dev,
2457				ICMPV6_MGM_REDUCTION);
2458	} else {
2459		mld_add_delrec(ma->idev, ma);
2460		mld_ifc_event(ma->idev);
2461	}
2462}
2463
2464static void mld_gq_timer_expire(struct timer_list *t)
2465{
2466	struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer);
2467
2468	idev->mc_gq_running = 0;
2469	mld_send_report(idev, NULL);
2470	in6_dev_put(idev);
2471}
2472
2473static void mld_ifc_timer_expire(struct timer_list *t)
2474{
2475	struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer);
2476
2477	mld_send_cr(idev);
2478	if (idev->mc_ifc_count) {
2479		idev->mc_ifc_count--;
2480		if (idev->mc_ifc_count)
2481			mld_ifc_start_timer(idev,
2482					    unsolicited_report_interval(idev));
2483	}
2484	in6_dev_put(idev);
2485}
2486
2487static void mld_ifc_event(struct inet6_dev *idev)
2488{
2489	if (mld_in_v1_mode(idev))
2490		return;
2491	idev->mc_ifc_count = idev->mc_qrv;
2492	mld_ifc_start_timer(idev, 1);
2493}
2494
2495static void igmp6_timer_handler(struct timer_list *t)
2496{
2497	struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer);
2498
2499	if (mld_in_v1_mode(ma->idev))
2500		igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2501	else
2502		mld_send_report(ma->idev, ma);
2503
2504	spin_lock(&ma->mca_lock);
2505	ma->mca_flags |=  MAF_LAST_REPORTER;
2506	ma->mca_flags &= ~MAF_TIMER_RUNNING;
2507	spin_unlock(&ma->mca_lock);
2508	ma_put(ma);
2509}
2510
2511/* Device changing type */
2512
2513void ipv6_mc_unmap(struct inet6_dev *idev)
2514{
2515	struct ifmcaddr6 *i;
2516
2517	/* Install multicast list, except for all-nodes (already installed) */
2518
2519	read_lock_bh(&idev->lock);
2520	for (i = idev->mc_list; i; i = i->next)
2521		igmp6_group_dropped(i);
2522	read_unlock_bh(&idev->lock);
2523}
2524
2525void ipv6_mc_remap(struct inet6_dev *idev)
2526{
2527	ipv6_mc_up(idev);
2528}
2529
2530/* Device going down */
2531
2532void ipv6_mc_down(struct inet6_dev *idev)
2533{
2534	struct ifmcaddr6 *i;
2535
2536	/* Withdraw multicast list */
2537
2538	read_lock_bh(&idev->lock);
2539
2540	for (i = idev->mc_list; i; i = i->next)
2541		igmp6_group_dropped(i);
2542
2543	/* Should stop timer after group drop. or we will
2544	 * start timer again in mld_ifc_event()
2545	 */
2546	mld_ifc_stop_timer(idev);
2547	mld_gq_stop_timer(idev);
2548	mld_dad_stop_timer(idev);
2549	read_unlock_bh(&idev->lock);
2550}
2551
2552static void ipv6_mc_reset(struct inet6_dev *idev)
2553{
2554	idev->mc_qrv = sysctl_mld_qrv;
2555	idev->mc_qi = MLD_QI_DEFAULT;
2556	idev->mc_qri = MLD_QRI_DEFAULT;
2557	idev->mc_v1_seen = 0;
2558	idev->mc_maxdelay = unsolicited_report_interval(idev);
2559}
2560
2561/* Device going up */
2562
2563void ipv6_mc_up(struct inet6_dev *idev)
2564{
2565	struct ifmcaddr6 *i;
2566
2567	/* Install multicast list, except for all-nodes (already installed) */
2568
2569	read_lock_bh(&idev->lock);
2570	ipv6_mc_reset(idev);
2571	for (i = idev->mc_list; i; i = i->next) {
2572		mld_del_delrec(idev, i);
2573		igmp6_group_added(i);
2574	}
2575	read_unlock_bh(&idev->lock);
2576}
2577
2578/* IPv6 device initialization. */
2579
2580void ipv6_mc_init_dev(struct inet6_dev *idev)
2581{
2582	write_lock_bh(&idev->lock);
2583	spin_lock_init(&idev->mc_lock);
2584	idev->mc_gq_running = 0;
2585	timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0);
2586	idev->mc_tomb = NULL;
2587	idev->mc_ifc_count = 0;
2588	timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0);
2589	timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0);
2590	ipv6_mc_reset(idev);
2591	write_unlock_bh(&idev->lock);
2592}
2593
2594/*
2595 *	Device is about to be destroyed: clean up.
2596 */
2597
2598void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2599{
2600	struct ifmcaddr6 *i;
2601
2602	/* Deactivate timers */
2603	ipv6_mc_down(idev);
2604	mld_clear_delrec(idev);
2605
2606	/* Delete all-nodes address. */
2607	/* We cannot call ipv6_dev_mc_dec() directly, our caller in
2608	 * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2609	 * fail.
2610	 */
2611	__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2612
2613	if (idev->cnf.forwarding)
2614		__ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2615
2616	write_lock_bh(&idev->lock);
2617	while ((i = idev->mc_list) != NULL) {
2618		idev->mc_list = i->next;
2619
2620		write_unlock_bh(&idev->lock);
2621		ma_put(i);
2622		write_lock_bh(&idev->lock);
2623	}
2624	write_unlock_bh(&idev->lock);
2625}
2626
2627static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2628{
2629	struct ifmcaddr6 *pmc;
2630
2631	ASSERT_RTNL();
2632
2633	if (mld_in_v1_mode(idev)) {
2634		read_lock_bh(&idev->lock);
2635		for (pmc = idev->mc_list; pmc; pmc = pmc->next)
2636			igmp6_join_group(pmc);
2637		read_unlock_bh(&idev->lock);
2638	} else
2639		mld_send_report(idev, NULL);
2640}
2641
2642static int ipv6_mc_netdev_event(struct notifier_block *this,
2643				unsigned long event,
2644				void *ptr)
2645{
2646	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2647	struct inet6_dev *idev = __in6_dev_get(dev);
2648
2649	switch (event) {
2650	case NETDEV_RESEND_IGMP:
2651		if (idev)
2652			ipv6_mc_rejoin_groups(idev);
2653		break;
2654	default:
2655		break;
2656	}
2657
2658	return NOTIFY_DONE;
2659}
2660
2661static struct notifier_block igmp6_netdev_notifier = {
2662	.notifier_call = ipv6_mc_netdev_event,
2663};
2664
2665#ifdef CONFIG_PROC_FS
2666struct igmp6_mc_iter_state {
2667	struct seq_net_private p;
2668	struct net_device *dev;
2669	struct inet6_dev *idev;
2670};
2671
2672#define igmp6_mc_seq_private(seq)	((struct igmp6_mc_iter_state *)(seq)->private)
2673
2674static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2675{
2676	struct ifmcaddr6 *im = NULL;
2677	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2678	struct net *net = seq_file_net(seq);
2679
2680	state->idev = NULL;
2681	for_each_netdev_rcu(net, state->dev) {
2682		struct inet6_dev *idev;
2683		idev = __in6_dev_get(state->dev);
2684		if (!idev)
2685			continue;
2686		read_lock_bh(&idev->lock);
2687		im = idev->mc_list;
2688		if (im) {
2689			state->idev = idev;
2690			break;
2691		}
2692		read_unlock_bh(&idev->lock);
2693	}
2694	return im;
2695}
2696
2697static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2698{
2699	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2700
2701	im = im->next;
2702	while (!im) {
2703		if (likely(state->idev))
2704			read_unlock_bh(&state->idev->lock);
2705
2706		state->dev = next_net_device_rcu(state->dev);
2707		if (!state->dev) {
2708			state->idev = NULL;
2709			break;
2710		}
2711		state->idev = __in6_dev_get(state->dev);
2712		if (!state->idev)
2713			continue;
2714		read_lock_bh(&state->idev->lock);
2715		im = state->idev->mc_list;
2716	}
2717	return im;
2718}
2719
2720static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2721{
2722	struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2723	if (im)
2724		while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2725			--pos;
2726	return pos ? NULL : im;
2727}
2728
2729static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2730	__acquires(RCU)
2731{
2732	rcu_read_lock();
2733	return igmp6_mc_get_idx(seq, *pos);
2734}
2735
2736static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2737{
2738	struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2739
2740	++*pos;
2741	return im;
2742}
2743
2744static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2745	__releases(RCU)
2746{
2747	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2748
2749	if (likely(state->idev)) {
2750		read_unlock_bh(&state->idev->lock);
2751		state->idev = NULL;
2752	}
2753	state->dev = NULL;
2754	rcu_read_unlock();
2755}
2756
2757static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2758{
2759	struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2760	struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2761
2762	seq_printf(seq,
2763		   "%-4d %-15s %pi6 %5d %08X %ld\n",
2764		   state->dev->ifindex, state->dev->name,
2765		   &im->mca_addr,
2766		   im->mca_users, im->mca_flags,
2767		   (im->mca_flags&MAF_TIMER_RUNNING) ?
2768		   jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0);
2769	return 0;
2770}
2771
2772static const struct seq_operations igmp6_mc_seq_ops = {
2773	.start	=	igmp6_mc_seq_start,
2774	.next	=	igmp6_mc_seq_next,
2775	.stop	=	igmp6_mc_seq_stop,
2776	.show	=	igmp6_mc_seq_show,
2777};
2778
 
 
 
 
 
 
 
 
 
 
 
 
 
2779struct igmp6_mcf_iter_state {
2780	struct seq_net_private p;
2781	struct net_device *dev;
2782	struct inet6_dev *idev;
2783	struct ifmcaddr6 *im;
2784};
2785
2786#define igmp6_mcf_seq_private(seq)	((struct igmp6_mcf_iter_state *)(seq)->private)
2787
2788static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2789{
2790	struct ip6_sf_list *psf = NULL;
2791	struct ifmcaddr6 *im = NULL;
2792	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2793	struct net *net = seq_file_net(seq);
2794
2795	state->idev = NULL;
2796	state->im = NULL;
2797	for_each_netdev_rcu(net, state->dev) {
2798		struct inet6_dev *idev;
2799		idev = __in6_dev_get(state->dev);
2800		if (unlikely(idev == NULL))
2801			continue;
2802		read_lock_bh(&idev->lock);
2803		im = idev->mc_list;
2804		if (likely(im)) {
2805			spin_lock_bh(&im->mca_lock);
2806			psf = im->mca_sources;
2807			if (likely(psf)) {
2808				state->im = im;
2809				state->idev = idev;
2810				break;
2811			}
2812			spin_unlock_bh(&im->mca_lock);
2813		}
2814		read_unlock_bh(&idev->lock);
2815	}
2816	return psf;
2817}
2818
2819static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2820{
2821	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2822
2823	psf = psf->sf_next;
2824	while (!psf) {
2825		spin_unlock_bh(&state->im->mca_lock);
2826		state->im = state->im->next;
2827		while (!state->im) {
2828			if (likely(state->idev))
2829				read_unlock_bh(&state->idev->lock);
2830
2831			state->dev = next_net_device_rcu(state->dev);
2832			if (!state->dev) {
2833				state->idev = NULL;
2834				goto out;
2835			}
2836			state->idev = __in6_dev_get(state->dev);
2837			if (!state->idev)
2838				continue;
2839			read_lock_bh(&state->idev->lock);
2840			state->im = state->idev->mc_list;
2841		}
2842		if (!state->im)
2843			break;
2844		spin_lock_bh(&state->im->mca_lock);
2845		psf = state->im->mca_sources;
2846	}
2847out:
2848	return psf;
2849}
2850
2851static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
2852{
2853	struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
2854	if (psf)
2855		while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
2856			--pos;
2857	return pos ? NULL : psf;
2858}
2859
2860static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2861	__acquires(RCU)
2862{
2863	rcu_read_lock();
2864	return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2865}
2866
2867static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2868{
2869	struct ip6_sf_list *psf;
2870	if (v == SEQ_START_TOKEN)
2871		psf = igmp6_mcf_get_first(seq);
2872	else
2873		psf = igmp6_mcf_get_next(seq, v);
2874	++*pos;
2875	return psf;
2876}
2877
2878static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
2879	__releases(RCU)
2880{
2881	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2882	if (likely(state->im)) {
2883		spin_unlock_bh(&state->im->mca_lock);
2884		state->im = NULL;
2885	}
2886	if (likely(state->idev)) {
2887		read_unlock_bh(&state->idev->lock);
2888		state->idev = NULL;
2889	}
2890	state->dev = NULL;
2891	rcu_read_unlock();
2892}
2893
2894static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
2895{
2896	struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
2897	struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2898
2899	if (v == SEQ_START_TOKEN) {
2900		seq_puts(seq, "Idx Device                Multicast Address                   Source Address    INC    EXC\n");
2901	} else {
2902		seq_printf(seq,
2903			   "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
2904			   state->dev->ifindex, state->dev->name,
2905			   &state->im->mca_addr,
2906			   &psf->sf_addr,
2907			   psf->sf_count[MCAST_INCLUDE],
2908			   psf->sf_count[MCAST_EXCLUDE]);
2909	}
2910	return 0;
2911}
2912
2913static const struct seq_operations igmp6_mcf_seq_ops = {
2914	.start	=	igmp6_mcf_seq_start,
2915	.next	=	igmp6_mcf_seq_next,
2916	.stop	=	igmp6_mcf_seq_stop,
2917	.show	=	igmp6_mcf_seq_show,
2918};
2919
 
 
 
 
 
 
 
 
 
 
 
 
 
2920static int __net_init igmp6_proc_init(struct net *net)
2921{
2922	int err;
2923
2924	err = -ENOMEM;
2925	if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
2926			sizeof(struct igmp6_mc_iter_state)))
2927		goto out;
2928	if (!proc_create_net("mcfilter6", 0444, net->proc_net,
2929			&igmp6_mcf_seq_ops,
2930			sizeof(struct igmp6_mcf_iter_state)))
2931		goto out_proc_net_igmp6;
2932
2933	err = 0;
2934out:
2935	return err;
2936
2937out_proc_net_igmp6:
2938	remove_proc_entry("igmp6", net->proc_net);
2939	goto out;
2940}
2941
2942static void __net_exit igmp6_proc_exit(struct net *net)
2943{
2944	remove_proc_entry("mcfilter6", net->proc_net);
2945	remove_proc_entry("igmp6", net->proc_net);
2946}
2947#else
2948static inline int igmp6_proc_init(struct net *net)
2949{
2950	return 0;
2951}
2952static inline void igmp6_proc_exit(struct net *net)
2953{
2954}
2955#endif
2956
2957static int __net_init igmp6_net_init(struct net *net)
2958{
2959	int err;
2960
2961	err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
2962				   SOCK_RAW, IPPROTO_ICMPV6, net);
2963	if (err < 0) {
2964		pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
2965		       err);
2966		goto out;
2967	}
2968
2969	inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
2970
2971	err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
2972				   SOCK_RAW, IPPROTO_ICMPV6, net);
2973	if (err < 0) {
2974		pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
2975		       err);
2976		goto out_sock_create;
2977	}
2978
2979	err = igmp6_proc_init(net);
2980	if (err)
2981		goto out_sock_create_autojoin;
2982
2983	return 0;
2984
2985out_sock_create_autojoin:
2986	inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2987out_sock_create:
2988	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2989out:
2990	return err;
2991}
2992
2993static void __net_exit igmp6_net_exit(struct net *net)
2994{
2995	inet_ctl_sock_destroy(net->ipv6.igmp_sk);
2996	inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
2997	igmp6_proc_exit(net);
2998}
2999
3000static struct pernet_operations igmp6_net_ops = {
3001	.init = igmp6_net_init,
3002	.exit = igmp6_net_exit,
3003};
3004
3005int __init igmp6_init(void)
3006{
3007	return register_pernet_subsys(&igmp6_net_ops);
3008}
3009
3010int __init igmp6_late_init(void)
3011{
3012	return register_netdevice_notifier(&igmp6_netdev_notifier);
3013}
3014
3015void igmp6_cleanup(void)
3016{
3017	unregister_pernet_subsys(&igmp6_net_ops);
3018}
3019
3020void igmp6_late_cleanup(void)
3021{
3022	unregister_netdevice_notifier(&igmp6_netdev_notifier);
3023}