1/*
   2 *	Linux NET3:	Internet Group Management Protocol  [IGMP]
   3 *
   4 *	This code implements the IGMP protocol as defined in RFC1112. There has
   5 *	been a further revision of this protocol since which is now supported.
   6 *
   7 *	If you have trouble with this module be careful what gcc you have used,
   8 *	the older version didn't come out right using gcc 2.5.8, the newer one
   9 *	seems to fall out with gcc 2.6.2.
  10 *
  11 *	Authors:
  12 *		Alan Cox <alan@lxorguk.ukuu.org.uk>
  13 *
  14 *	This program is free software; you can redistribute it and/or
  15 *	modify it under the terms of the GNU General Public License
  16 *	as published by the Free Software Foundation; either version
  17 *	2 of the License, or (at your option) any later version.
  18 *
  19 *	Fixes:
  20 *
  21 *		Alan Cox	:	Added lots of __inline__ to optimise
  22 *					the memory usage of all the tiny little
  23 *					functions.
  24 *		Alan Cox	:	Dumped the header building experiment.
  25 *		Alan Cox	:	Minor tweaks ready for multicast routing
  26 *					and extended IGMP protocol.
  27 *		Alan Cox	:	Removed a load of inline directives. Gcc 2.5.8
  28 *					writes utterly bogus code otherwise (sigh)
  29 *					fixed IGMP loopback to behave in the manner
  30 *					desired by mrouted, fixed the fact it has been
  31 *					broken since 1.3.6 and cleaned up a few minor
  32 *					points.
  33 *
  34 *		Chih-Jen Chang	:	Tried to revise IGMP to Version 2
  35 *		Tsu-Sheng Tsao		E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
  36 *					The enhancements are mainly based on Steve Deering's
  37 * 					ipmulti-3.5 source code.
  38 *		Chih-Jen Chang	:	Added the igmp_get_mrouter_info and
  39 *		Tsu-Sheng Tsao		igmp_set_mrouter_info to keep track of
  40 *					the mrouted version on that device.
  41 *		Chih-Jen Chang	:	Added the max_resp_time parameter to
  42 *		Tsu-Sheng Tsao		igmp_heard_query(). Using this parameter
  43 *					to identify the multicast router version
  44 *					and do what the IGMP version 2 specified.
  45 *		Chih-Jen Chang	:	Added a timer to revert to IGMP V2 router
  46 *		Tsu-Sheng Tsao		if the specified time expired.
  47 *		Alan Cox	:	Stop IGMP from 0.0.0.0 being accepted.
  48 *		Alan Cox	:	Use GFP_ATOMIC in the right places.
  49 *		Christian Daudt :	igmp timer wasn't set for local group
  50 *					memberships but was being deleted,
  51 *					which caused a "del_timer() called
  52 *					from %p with timer not initialized\n"
  53 *					message (960131).
  54 *		Christian Daudt :	removed del_timer from
  55 *					igmp_timer_expire function (960205).
  56 *             Christian Daudt :       igmp_heard_report now only calls
  57 *                                     igmp_timer_expire if tm->running is
  58 *                                     true (960216).
  59 *		Malcolm Beattie :	ttl comparison wrong in igmp_rcv made
  60 *					igmp_heard_query never trigger. Expiry
  61 *					miscalculation fixed in igmp_heard_query
  62 *					and random() made to return unsigned to
  63 *					prevent negative expiry times.
  64 *		Alexey Kuznetsov:	Wrong group leaving behaviour, backport
  65 *					fix from pending 2.1.x patches.
  66 *		Alan Cox:		Forget to enable FDDI support earlier.
  67 *		Alexey Kuznetsov:	Fixed leaving groups on device down.
  68 *		Alexey Kuznetsov:	Accordance to igmp-v2-06 draft.
  69 *		David L Stevens:	IGMPv3 support, with help from
  70 *					Vinay Kulkarni
  71 */
  72
  73#include <linux/module.h>
  74#include <linux/slab.h>
  75#include <asm/uaccess.h>
  76#include <linux/types.h>
  77#include <linux/kernel.h>
  78#include <linux/jiffies.h>
  79#include <linux/string.h>
  80#include <linux/socket.h>
  81#include <linux/sockios.h>
  82#include <linux/in.h>
  83#include <linux/inet.h>
  84#include <linux/netdevice.h>
  85#include <linux/skbuff.h>
  86#include <linux/inetdevice.h>
  87#include <linux/igmp.h>
  88#include <linux/if_arp.h>
  89#include <linux/rtnetlink.h>
  90#include <linux/times.h>
 
 
  91
  92#include <net/net_namespace.h>
  93#include <net/arp.h>
  94#include <net/ip.h>
  95#include <net/protocol.h>
  96#include <net/route.h>
  97#include <net/sock.h>
  98#include <net/checksum.h>
 
  99#include <linux/netfilter_ipv4.h>
 100#ifdef CONFIG_IP_MROUTE
 101#include <linux/mroute.h>
 102#endif
 103#ifdef CONFIG_PROC_FS
 104#include <linux/proc_fs.h>
 105#include <linux/seq_file.h>
 106#endif
 107
 108#define IP_MAX_MEMBERSHIPS	20
 109#define IP_MAX_MSF		10
 110
 111#ifdef CONFIG_IP_MULTICAST
 112/* Parameter names and values are taken from igmp-v2-06 draft */
 113
 114#define IGMP_V1_Router_Present_Timeout		(400*HZ)
 115#define IGMP_V2_Router_Present_Timeout		(400*HZ)
 116#define IGMP_Unsolicited_Report_Interval	(10*HZ)
 117#define IGMP_Query_Response_Interval		(10*HZ)
 118#define IGMP_Unsolicited_Report_Count		2
 119
 120
 121#define IGMP_Initial_Report_Delay		(1)
 122
 123/* IGMP_Initial_Report_Delay is not from IGMP specs!
 124 * IGMP specs require to report membership immediately after
 125 * joining a group, but we delay the first report by a
 126 * small interval. It seems more natural and still does not
 127 * contradict to specs provided this delay is small enough.
 128 */
 129
 130#define IGMP_V1_SEEN(in_dev) \
 131	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
 132	 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
 133	 ((in_dev)->mr_v1_seen && \
 134	  time_before(jiffies, (in_dev)->mr_v1_seen)))
 135#define IGMP_V2_SEEN(in_dev) \
 136	(IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
 137	 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
 138	 ((in_dev)->mr_v2_seen && \
 139	  time_before(jiffies, (in_dev)->mr_v2_seen)))
 140
 141static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
 142static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 143static void igmpv3_clear_delrec(struct in_device *in_dev);
 144static int sf_setstate(struct ip_mc_list *pmc);
 145static void sf_markstate(struct ip_mc_list *pmc);
 146#endif
 147static void ip_mc_clear_src(struct ip_mc_list *pmc);
 148static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
 149			 int sfcount, __be32 *psfsrc, int delta);
 150
 151static void ip_ma_put(struct ip_mc_list *im)
 152{
 153	if (atomic_dec_and_test(&im->refcnt)) {
 154		in_dev_put(im->interface);
 155		kfree_rcu(im, rcu);
 156	}
 157}
 158
 159#define for_each_pmc_rcu(in_dev, pmc)				\
 160	for (pmc = rcu_dereference(in_dev->mc_list);		\
 161	     pmc != NULL;					\
 162	     pmc = rcu_dereference(pmc->next_rcu))
 163
 164#define for_each_pmc_rtnl(in_dev, pmc)				\
 165	for (pmc = rtnl_dereference(in_dev->mc_list);		\
 166	     pmc != NULL;					\
 167	     pmc = rtnl_dereference(pmc->next_rcu))
 168
 
 
 
 
 
 
 
 
 
 
 
 169#ifdef CONFIG_IP_MULTICAST
 170
 171/*
 172 *	Timer management
 173 */
 174
 175static void igmp_stop_timer(struct ip_mc_list *im)
 176{
 177	spin_lock_bh(&im->lock);
 178	if (del_timer(&im->timer))
 179		atomic_dec(&im->refcnt);
 180	im->tm_running = 0;
 181	im->reporter = 0;
 182	im->unsolicit_count = 0;
 183	spin_unlock_bh(&im->lock);
 184}
 185
 186/* It must be called with locked im->lock */
 187static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
 188{
 189	int tv = net_random() % max_delay;
 190
 191	im->tm_running = 1;
 192	if (!mod_timer(&im->timer, jiffies+tv+2))
 193		atomic_inc(&im->refcnt);
 194}
 195
 196static void igmp_gq_start_timer(struct in_device *in_dev)
 197{
 198	int tv = net_random() % in_dev->mr_maxdelay;
 
 
 
 
 
 199
 200	in_dev->mr_gq_running = 1;
 201	if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
 202		in_dev_hold(in_dev);
 203}
 204
 205static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
 206{
 207	int tv = net_random() % delay;
 208
 209	if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
 210		in_dev_hold(in_dev);
 211}
 212
 213static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
 214{
 215	spin_lock_bh(&im->lock);
 216	im->unsolicit_count = 0;
 217	if (del_timer(&im->timer)) {
 218		if ((long)(im->timer.expires-jiffies) < max_delay) {
 219			add_timer(&im->timer);
 220			im->tm_running = 1;
 221			spin_unlock_bh(&im->lock);
 222			return;
 223		}
 224		atomic_dec(&im->refcnt);
 225	}
 226	igmp_start_timer(im, max_delay);
 227	spin_unlock_bh(&im->lock);
 228}
 229
 230
 231/*
 232 *	Send an IGMP report.
 233 */
 234
 235#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
 236
 237
 238static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
 239	int gdeleted, int sdeleted)
 240{
 241	switch (type) {
 242	case IGMPV3_MODE_IS_INCLUDE:
 243	case IGMPV3_MODE_IS_EXCLUDE:
 244		if (gdeleted || sdeleted)
 245			return 0;
 246		if (!(pmc->gsquery && !psf->sf_gsresp)) {
 247			if (pmc->sfmode == MCAST_INCLUDE)
 248				return 1;
 249			/* don't include if this source is excluded
 250			 * in all filters
 251			 */
 252			if (psf->sf_count[MCAST_INCLUDE])
 253				return type == IGMPV3_MODE_IS_INCLUDE;
 254			return pmc->sfcount[MCAST_EXCLUDE] ==
 255				psf->sf_count[MCAST_EXCLUDE];
 256		}
 257		return 0;
 258	case IGMPV3_CHANGE_TO_INCLUDE:
 259		if (gdeleted || sdeleted)
 260			return 0;
 261		return psf->sf_count[MCAST_INCLUDE] != 0;
 262	case IGMPV3_CHANGE_TO_EXCLUDE:
 263		if (gdeleted || sdeleted)
 264			return 0;
 265		if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
 266		    psf->sf_count[MCAST_INCLUDE])
 267			return 0;
 268		return pmc->sfcount[MCAST_EXCLUDE] ==
 269			psf->sf_count[MCAST_EXCLUDE];
 270	case IGMPV3_ALLOW_NEW_SOURCES:
 271		if (gdeleted || !psf->sf_crcount)
 272			return 0;
 273		return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
 274	case IGMPV3_BLOCK_OLD_SOURCES:
 275		if (pmc->sfmode == MCAST_INCLUDE)
 276			return gdeleted || (psf->sf_crcount && sdeleted);
 277		return psf->sf_crcount && !gdeleted && !sdeleted;
 278	}
 279	return 0;
 280}
 281
 282static int
 283igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
 284{
 285	struct ip_sf_list *psf;
 286	int scount = 0;
 287
 288	for (psf=pmc->sources; psf; psf=psf->sf_next) {
 289		if (!is_in(pmc, psf, type, gdeleted, sdeleted))
 290			continue;
 291		scount++;
 292	}
 293	return scount;
 294}
 295
 296#define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
 
 
 
 
 
 
 
 
 
 
 
 
 
 297
 298static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
 
 
 
 299{
 300	struct sk_buff *skb;
 301	struct rtable *rt;
 302	struct iphdr *pip;
 303	struct igmpv3_report *pig;
 304	struct net *net = dev_net(dev);
 305	struct flowi4 fl4;
 306	int hlen = LL_RESERVED_SPACE(dev);
 307	int tlen = dev->needed_tailroom;
 
 308
 309	while (1) {
 310		skb = alloc_skb(size + hlen + tlen,
 311				GFP_ATOMIC | __GFP_NOWARN);
 312		if (skb)
 313			break;
 314		size >>= 1;
 315		if (size < 256)
 316			return NULL;
 317	}
 318	igmp_skb_size(skb) = size;
 319
 320	rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
 321				   0, 0,
 322				   IPPROTO_IGMP, 0, dev->ifindex);
 323	if (IS_ERR(rt)) {
 324		kfree_skb(skb);
 325		return NULL;
 326	}
 327
 328	skb_dst_set(skb, &rt->dst);
 329	skb->dev = dev;
 330
 331	skb_reserve(skb, hlen);
 
 332
 333	skb_reset_network_header(skb);
 334	pip = ip_hdr(skb);
 335	skb_put(skb, sizeof(struct iphdr) + 4);
 336
 337	pip->version  = 4;
 338	pip->ihl      = (sizeof(struct iphdr)+4)>>2;
 339	pip->tos      = 0xc0;
 340	pip->frag_off = htons(IP_DF);
 341	pip->ttl      = 1;
 342	pip->daddr    = fl4.daddr;
 343	pip->saddr    = fl4.saddr;
 
 
 
 
 344	pip->protocol = IPPROTO_IGMP;
 345	pip->tot_len  = 0;	/* filled in later */
 346	ip_select_ident(pip, &rt->dst, NULL);
 347	((u8 *)&pip[1])[0] = IPOPT_RA;
 348	((u8 *)&pip[1])[1] = 4;
 349	((u8 *)&pip[1])[2] = 0;
 350	((u8 *)&pip[1])[3] = 0;
 351
 352	skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
 353	skb_put(skb, sizeof(*pig));
 354	pig = igmpv3_report_hdr(skb);
 355	pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
 356	pig->resv1 = 0;
 357	pig->csum = 0;
 358	pig->resv2 = 0;
 359	pig->ngrec = 0;
 360	return skb;
 361}
 362
 363static int igmpv3_sendpack(struct sk_buff *skb)
 364{
 365	struct igmphdr *pig = igmp_hdr(skb);
 366	const int igmplen = skb->tail - skb->transport_header;
 367
 368	pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
 369
 370	return ip_local_out(skb);
 371}
 372
 373static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
 374{
 375	return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
 376}
 377
 378static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
 379	int type, struct igmpv3_grec **ppgr)
 380{
 381	struct net_device *dev = pmc->interface->dev;
 382	struct igmpv3_report *pih;
 383	struct igmpv3_grec *pgr;
 384
 385	if (!skb)
 386		skb = igmpv3_newpack(dev, dev->mtu);
 387	if (!skb)
 388		return NULL;
 389	pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
 
 390	pgr->grec_type = type;
 391	pgr->grec_auxwords = 0;
 392	pgr->grec_nsrcs = 0;
 393	pgr->grec_mca = pmc->multiaddr;
 394	pih = igmpv3_report_hdr(skb);
 395	pih->ngrec = htons(ntohs(pih->ngrec)+1);
 396	*ppgr = pgr;
 397	return skb;
 398}
 399
 400#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
 401	skb_tailroom(skb)) : 0)
 402
 403static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
 404	int type, int gdeleted, int sdeleted)
 405{
 406	struct net_device *dev = pmc->interface->dev;
 
 407	struct igmpv3_report *pih;
 408	struct igmpv3_grec *pgr = NULL;
 409	struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
 410	int scount, stotal, first, isquery, truncate;
 
 411
 412	if (pmc->multiaddr == IGMP_ALL_HOSTS)
 413		return skb;
 
 
 
 
 
 
 414
 415	isquery = type == IGMPV3_MODE_IS_INCLUDE ||
 416		  type == IGMPV3_MODE_IS_EXCLUDE;
 417	truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
 418		    type == IGMPV3_CHANGE_TO_EXCLUDE;
 419
 420	stotal = scount = 0;
 421
 422	psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
 423
 424	if (!*psf_list)
 425		goto empty_source;
 426
 427	pih = skb ? igmpv3_report_hdr(skb) : NULL;
 428
 429	/* EX and TO_EX get a fresh packet, if needed */
 430	if (truncate) {
 431		if (pih && pih->ngrec &&
 432		    AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
 433			if (skb)
 434				igmpv3_sendpack(skb);
 435			skb = igmpv3_newpack(dev, dev->mtu);
 436		}
 437	}
 438	first = 1;
 439	psf_prev = NULL;
 440	for (psf=*psf_list; psf; psf=psf_next) {
 441		__be32 *psrc;
 442
 443		psf_next = psf->sf_next;
 444
 445		if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
 446			psf_prev = psf;
 447			continue;
 448		}
 449
 
 
 
 
 
 
 
 
 
 450		/* clear marks on query responses */
 451		if (isquery)
 452			psf->sf_gsresp = 0;
 453
 454		if (AVAILABLE(skb) < sizeof(__be32) +
 455		    first*sizeof(struct igmpv3_grec)) {
 456			if (truncate && !first)
 457				break;	 /* truncate these */
 458			if (pgr)
 459				pgr->grec_nsrcs = htons(scount);
 460			if (skb)
 461				igmpv3_sendpack(skb);
 462			skb = igmpv3_newpack(dev, dev->mtu);
 463			first = 1;
 464			scount = 0;
 465		}
 466		if (first) {
 467			skb = add_grhead(skb, pmc, type, &pgr);
 468			first = 0;
 469		}
 470		if (!skb)
 471			return NULL;
 472		psrc = (__be32 *)skb_put(skb, sizeof(__be32));
 473		*psrc = psf->sf_inaddr;
 474		scount++; stotal++;
 475		if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
 476		     type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
 
 477			psf->sf_crcount--;
 478			if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
 479				if (psf_prev)
 480					psf_prev->sf_next = psf->sf_next;
 481				else
 482					*psf_list = psf->sf_next;
 483				kfree(psf);
 484				continue;
 485			}
 486		}
 487		psf_prev = psf;
 488	}
 489
 490empty_source:
 491	if (!stotal) {
 492		if (type == IGMPV3_ALLOW_NEW_SOURCES ||
 493		    type == IGMPV3_BLOCK_OLD_SOURCES)
 494			return skb;
 495		if (pmc->crcount || isquery) {
 496			/* make sure we have room for group header */
 497			if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
 498				igmpv3_sendpack(skb);
 499				skb = NULL; /* add_grhead will get a new one */
 500			}
 501			skb = add_grhead(skb, pmc, type, &pgr);
 502		}
 503	}
 504	if (pgr)
 505		pgr->grec_nsrcs = htons(scount);
 506
 507	if (isquery)
 508		pmc->gsquery = 0;	/* clear query state on report */
 509	return skb;
 510}
 511
 512static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
 513{
 514	struct sk_buff *skb = NULL;
 
 515	int type;
 516
 517	if (!pmc) {
 518		rcu_read_lock();
 519		for_each_pmc_rcu(in_dev, pmc) {
 520			if (pmc->multiaddr == IGMP_ALL_HOSTS)
 521				continue;
 
 
 
 522			spin_lock_bh(&pmc->lock);
 523			if (pmc->sfcount[MCAST_EXCLUDE])
 524				type = IGMPV3_MODE_IS_EXCLUDE;
 525			else
 526				type = IGMPV3_MODE_IS_INCLUDE;
 527			skb = add_grec(skb, pmc, type, 0, 0);
 528			spin_unlock_bh(&pmc->lock);
 529		}
 530		rcu_read_unlock();
 531	} else {
 532		spin_lock_bh(&pmc->lock);
 533		if (pmc->sfcount[MCAST_EXCLUDE])
 534			type = IGMPV3_MODE_IS_EXCLUDE;
 535		else
 536			type = IGMPV3_MODE_IS_INCLUDE;
 537		skb = add_grec(skb, pmc, type, 0, 0);
 538		spin_unlock_bh(&pmc->lock);
 539	}
 540	if (!skb)
 541		return 0;
 542	return igmpv3_sendpack(skb);
 543}
 544
 545/*
 546 * remove zero-count source records from a source filter list
 547 */
 548static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
 549{
 550	struct ip_sf_list *psf_prev, *psf_next, *psf;
 551
 552	psf_prev = NULL;
 553	for (psf=*ppsf; psf; psf = psf_next) {
 554		psf_next = psf->sf_next;
 555		if (psf->sf_crcount == 0) {
 556			if (psf_prev)
 557				psf_prev->sf_next = psf->sf_next;
 558			else
 559				*ppsf = psf->sf_next;
 560			kfree(psf);
 561		} else
 562			psf_prev = psf;
 563	}
 564}
 565
 
 
 
 
 
 
 
 566static void igmpv3_send_cr(struct in_device *in_dev)
 567{
 568	struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
 569	struct sk_buff *skb = NULL;
 570	int type, dtype;
 571
 572	rcu_read_lock();
 573	spin_lock_bh(&in_dev->mc_tomb_lock);
 574
 575	/* deleted MCA's */
 576	pmc_prev = NULL;
 577	for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
 578		pmc_next = pmc->next;
 579		if (pmc->sfmode == MCAST_INCLUDE) {
 580			type = IGMPV3_BLOCK_OLD_SOURCES;
 581			dtype = IGMPV3_BLOCK_OLD_SOURCES;
 582			skb = add_grec(skb, pmc, type, 1, 0);
 583			skb = add_grec(skb, pmc, dtype, 1, 1);
 584		}
 585		if (pmc->crcount) {
 586			if (pmc->sfmode == MCAST_EXCLUDE) {
 587				type = IGMPV3_CHANGE_TO_INCLUDE;
 588				skb = add_grec(skb, pmc, type, 1, 0);
 589			}
 590			pmc->crcount--;
 591			if (pmc->crcount == 0) {
 592				igmpv3_clear_zeros(&pmc->tomb);
 593				igmpv3_clear_zeros(&pmc->sources);
 594			}
 595		}
 596		if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
 597			if (pmc_prev)
 598				pmc_prev->next = pmc_next;
 599			else
 600				in_dev->mc_tomb = pmc_next;
 601			in_dev_put(pmc->interface);
 602			kfree(pmc);
 603		} else
 604			pmc_prev = pmc;
 605	}
 606	spin_unlock_bh(&in_dev->mc_tomb_lock);
 607
 608	/* change recs */
 609	for_each_pmc_rcu(in_dev, pmc) {
 610		spin_lock_bh(&pmc->lock);
 611		if (pmc->sfcount[MCAST_EXCLUDE]) {
 612			type = IGMPV3_BLOCK_OLD_SOURCES;
 613			dtype = IGMPV3_ALLOW_NEW_SOURCES;
 614		} else {
 615			type = IGMPV3_ALLOW_NEW_SOURCES;
 616			dtype = IGMPV3_BLOCK_OLD_SOURCES;
 617		}
 618		skb = add_grec(skb, pmc, type, 0, 0);
 619		skb = add_grec(skb, pmc, dtype, 0, 1);	/* deleted sources */
 620
 621		/* filter mode changes */
 622		if (pmc->crcount) {
 623			if (pmc->sfmode == MCAST_EXCLUDE)
 624				type = IGMPV3_CHANGE_TO_EXCLUDE;
 625			else
 626				type = IGMPV3_CHANGE_TO_INCLUDE;
 627			skb = add_grec(skb, pmc, type, 0, 0);
 628			pmc->crcount--;
 629		}
 630		spin_unlock_bh(&pmc->lock);
 631	}
 632	rcu_read_unlock();
 633
 634	if (!skb)
 635		return;
 636	(void) igmpv3_sendpack(skb);
 637}
 638
 639static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
 640	int type)
 641{
 642	struct sk_buff *skb;
 643	struct iphdr *iph;
 644	struct igmphdr *ih;
 645	struct rtable *rt;
 646	struct net_device *dev = in_dev->dev;
 647	struct net *net = dev_net(dev);
 648	__be32	group = pmc ? pmc->multiaddr : 0;
 649	struct flowi4 fl4;
 650	__be32	dst;
 651	int hlen, tlen;
 652
 653	if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
 654		return igmpv3_send_report(in_dev, pmc);
 655	else if (type == IGMP_HOST_LEAVE_MESSAGE)
 
 
 
 
 656		dst = IGMP_ALL_ROUTER;
 657	else
 658		dst = group;
 659
 660	rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
 661				   0, 0,
 662				   IPPROTO_IGMP, 0, dev->ifindex);
 663	if (IS_ERR(rt))
 664		return -1;
 665
 666	hlen = LL_RESERVED_SPACE(dev);
 667	tlen = dev->needed_tailroom;
 668	skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
 669	if (skb == NULL) {
 670		ip_rt_put(rt);
 671		return -1;
 672	}
 
 673
 674	skb_dst_set(skb, &rt->dst);
 675
 676	skb_reserve(skb, hlen);
 677
 678	skb_reset_network_header(skb);
 679	iph = ip_hdr(skb);
 680	skb_put(skb, sizeof(struct iphdr) + 4);
 681
 682	iph->version  = 4;
 683	iph->ihl      = (sizeof(struct iphdr)+4)>>2;
 684	iph->tos      = 0xc0;
 685	iph->frag_off = htons(IP_DF);
 686	iph->ttl      = 1;
 687	iph->daddr    = dst;
 688	iph->saddr    = fl4.saddr;
 689	iph->protocol = IPPROTO_IGMP;
 690	ip_select_ident(iph, &rt->dst, NULL);
 691	((u8 *)&iph[1])[0] = IPOPT_RA;
 692	((u8 *)&iph[1])[1] = 4;
 693	((u8 *)&iph[1])[2] = 0;
 694	((u8 *)&iph[1])[3] = 0;
 695
 696	ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
 697	ih->type = type;
 698	ih->code = 0;
 699	ih->csum = 0;
 700	ih->group = group;
 701	ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
 702
 703	return ip_local_out(skb);
 704}
 705
 706static void igmp_gq_timer_expire(unsigned long data)
 707{
 708	struct in_device *in_dev = (struct in_device *)data;
 709
 710	in_dev->mr_gq_running = 0;
 711	igmpv3_send_report(in_dev, NULL);
 712	__in_dev_put(in_dev);
 713}
 714
 715static void igmp_ifc_timer_expire(unsigned long data)
 716{
 717	struct in_device *in_dev = (struct in_device *)data;
 718
 719	igmpv3_send_cr(in_dev);
 720	if (in_dev->mr_ifc_count) {
 721		in_dev->mr_ifc_count--;
 722		igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
 
 723	}
 724	__in_dev_put(in_dev);
 725}
 726
 727static void igmp_ifc_event(struct in_device *in_dev)
 728{
 
 729	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
 730		return;
 731	in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
 732		IGMP_Unsolicited_Report_Count;
 733	igmp_ifc_start_timer(in_dev, 1);
 734}
 735
 736
 737static void igmp_timer_expire(unsigned long data)
 738{
 739	struct ip_mc_list *im=(struct ip_mc_list *)data;
 740	struct in_device *in_dev = im->interface;
 741
 742	spin_lock(&im->lock);
 743	im->tm_running = 0;
 744
 745	if (im->unsolicit_count) {
 746		im->unsolicit_count--;
 747		igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
 748	}
 749	im->reporter = 1;
 750	spin_unlock(&im->lock);
 751
 752	if (IGMP_V1_SEEN(in_dev))
 753		igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
 754	else if (IGMP_V2_SEEN(in_dev))
 755		igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
 756	else
 757		igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
 758
 759	ip_ma_put(im);
 760}
 761
 762/* mark EXCLUDE-mode sources */
 763static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 764{
 765	struct ip_sf_list *psf;
 766	int i, scount;
 767
 768	scount = 0;
 769	for (psf=pmc->sources; psf; psf=psf->sf_next) {
 770		if (scount == nsrcs)
 771			break;
 772		for (i=0; i<nsrcs; i++) {
 773			/* skip inactive filters */
 774			if (psf->sf_count[MCAST_INCLUDE] ||
 775			    pmc->sfcount[MCAST_EXCLUDE] !=
 776			    psf->sf_count[MCAST_EXCLUDE])
 777				break;
 778			if (srcs[i] == psf->sf_inaddr) {
 779				scount++;
 780				break;
 781			}
 782		}
 783	}
 784	pmc->gsquery = 0;
 785	if (scount == nsrcs)	/* all sources excluded */
 786		return 0;
 787	return 1;
 788}
 789
 790static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
 791{
 792	struct ip_sf_list *psf;
 793	int i, scount;
 794
 795	if (pmc->sfmode == MCAST_EXCLUDE)
 796		return igmp_xmarksources(pmc, nsrcs, srcs);
 797
 798	/* mark INCLUDE-mode sources */
 799	scount = 0;
 800	for (psf=pmc->sources; psf; psf=psf->sf_next) {
 801		if (scount == nsrcs)
 802			break;
 803		for (i=0; i<nsrcs; i++)
 804			if (srcs[i] == psf->sf_inaddr) {
 805				psf->sf_gsresp = 1;
 806				scount++;
 807				break;
 808			}
 809	}
 810	if (!scount) {
 811		pmc->gsquery = 0;
 812		return 0;
 813	}
 814	pmc->gsquery = 1;
 815	return 1;
 816}
 817
 818static void igmp_heard_report(struct in_device *in_dev, __be32 group)
 
 819{
 820	struct ip_mc_list *im;
 
 821
 822	/* Timers are only set for non-local groups */
 823
 824	if (group == IGMP_ALL_HOSTS)
 825		return;
 
 
 826
 827	rcu_read_lock();
 828	for_each_pmc_rcu(in_dev, im) {
 829		if (im->multiaddr == group) {
 830			igmp_stop_timer(im);
 831			break;
 832		}
 833	}
 834	rcu_read_unlock();
 
 835}
 836
 837static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
 
 838	int len)
 839{
 840	struct igmphdr 		*ih = igmp_hdr(skb);
 841	struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
 842	struct ip_mc_list	*im;
 843	__be32			group = ih->group;
 844	int			max_delay;
 845	int			mark = 0;
 
 846
 847
 848	if (len == 8) {
 849		if (ih->code == 0) {
 850			/* Alas, old v1 router presents here. */
 851
 852			max_delay = IGMP_Query_Response_Interval;
 853			in_dev->mr_v1_seen = jiffies +
 854				IGMP_V1_Router_Present_Timeout;
 
 855			group = 0;
 856		} else {
 857			/* v2 router present */
 858			max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
 859			in_dev->mr_v2_seen = jiffies +
 860				IGMP_V2_Router_Present_Timeout;
 
 861		}
 862		/* cancel the interface change timer */
 863		in_dev->mr_ifc_count = 0;
 864		if (del_timer(&in_dev->mr_ifc_timer))
 865			__in_dev_put(in_dev);
 866		/* clear deleted report items */
 867		igmpv3_clear_delrec(in_dev);
 868	} else if (len < 12) {
 869		return;	/* ignore bogus packet; freed by caller */
 870	} else if (IGMP_V1_SEEN(in_dev)) {
 871		/* This is a v3 query with v1 queriers present */
 872		max_delay = IGMP_Query_Response_Interval;
 873		group = 0;
 874	} else if (IGMP_V2_SEEN(in_dev)) {
 875		/* this is a v3 query with v2 queriers present;
 876		 * Interpretation of the max_delay code is problematic here.
 877		 * A real v2 host would use ih_code directly, while v3 has a
 878		 * different encoding. We use the v3 encoding as more likely
 879		 * to be intended in a v3 query.
 880		 */
 881		max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 882		if (!max_delay)
 883			max_delay = 1;	/* can't mod w/ 0 */
 884	} else { /* v3 */
 885		if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
 886			return;
 887
 888		ih3 = igmpv3_query_hdr(skb);
 889		if (ih3->nsrcs) {
 890			if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
 891					   + ntohs(ih3->nsrcs)*sizeof(__be32)))
 892				return;
 893			ih3 = igmpv3_query_hdr(skb);
 894		}
 895
 896		max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
 897		if (!max_delay)
 898			max_delay = 1;	/* can't mod w/ 0 */
 899		in_dev->mr_maxdelay = max_delay;
 900		if (ih3->qrv)
 901			in_dev->mr_qrv = ih3->qrv;
 
 
 
 
 
 
 
 
 
 
 
 
 
 902		if (!group) { /* general query */
 903			if (ih3->nsrcs)
 904				return;	/* no sources allowed */
 905			igmp_gq_start_timer(in_dev);
 906			return;
 907		}
 908		/* mark sources to include, if group & source-specific */
 909		mark = ih3->nsrcs != 0;
 910	}
 911
 912	/*
 913	 * - Start the timers in all of our membership records
 914	 *   that the query applies to for the interface on
 915	 *   which the query arrived excl. those that belong
 916	 *   to a "local" group (224.0.0.X)
 917	 * - For timers already running check if they need to
 918	 *   be reset.
 919	 * - Use the igmp->igmp_code field as the maximum
 920	 *   delay possible
 921	 */
 922	rcu_read_lock();
 923	for_each_pmc_rcu(in_dev, im) {
 924		int changed;
 925
 926		if (group && group != im->multiaddr)
 927			continue;
 928		if (im->multiaddr == IGMP_ALL_HOSTS)
 929			continue;
 
 
 
 930		spin_lock_bh(&im->lock);
 931		if (im->tm_running)
 932			im->gsquery = im->gsquery && mark;
 933		else
 934			im->gsquery = mark;
 935		changed = !im->gsquery ||
 936			igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
 937		spin_unlock_bh(&im->lock);
 938		if (changed)
 939			igmp_mod_timer(im, max_delay);
 940	}
 941	rcu_read_unlock();
 
 942}
 943
 944/* called in rcu_read_lock() section */
 945int igmp_rcv(struct sk_buff *skb)
 946{
 947	/* This basically follows the spec line by line -- see RFC1112 */
 948	struct igmphdr *ih;
 949	struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
 
 950	int len = skb->len;
 
 
 
 
 
 
 
 951
 952	if (in_dev == NULL)
 
 953		goto drop;
 954
 955	if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
 956		goto drop;
 957
 958	switch (skb->ip_summed) {
 959	case CHECKSUM_COMPLETE:
 960		if (!csum_fold(skb->csum))
 961			break;
 962		/* fall through */
 963	case CHECKSUM_NONE:
 964		skb->csum = 0;
 965		if (__skb_checksum_complete(skb))
 966			goto drop;
 967	}
 968
 969	ih = igmp_hdr(skb);
 970	switch (ih->type) {
 971	case IGMP_HOST_MEMBERSHIP_QUERY:
 972		igmp_heard_query(in_dev, skb, len);
 973		break;
 974	case IGMP_HOST_MEMBERSHIP_REPORT:
 975	case IGMPV2_HOST_MEMBERSHIP_REPORT:
 976		/* Is it our report looped back? */
 977		if (rt_is_output_route(skb_rtable(skb)))
 978			break;
 979		/* don't rely on MC router hearing unicast reports */
 980		if (skb->pkt_type == PACKET_MULTICAST ||
 981		    skb->pkt_type == PACKET_BROADCAST)
 982			igmp_heard_report(in_dev, ih->group);
 983		break;
 984	case IGMP_PIM:
 985#ifdef CONFIG_IP_PIMSM_V1
 986		return pim_rcv_v1(skb);
 987#endif
 988	case IGMPV3_HOST_MEMBERSHIP_REPORT:
 989	case IGMP_DVMRP:
 990	case IGMP_TRACE:
 991	case IGMP_HOST_LEAVE_MESSAGE:
 992	case IGMP_MTRACE:
 993	case IGMP_MTRACE_RESP:
 994		break;
 995	default:
 996		break;
 997	}
 998
 999drop:
1000	kfree_skb(skb);
 
 
 
1001	return 0;
1002}
1003
1004#endif
1005
1006
1007/*
1008 *	Add a filter to a device
1009 */
1010
1011static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1012{
1013	char buf[MAX_ADDR_LEN];
1014	struct net_device *dev = in_dev->dev;
1015
1016	/* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1017	   We will get multicast token leakage, when IFF_MULTICAST
1018	   is changed. This check should be done in ndo_set_rx_mode
1019	   routine. Something sort of:
1020	   if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1021	   --ANK
1022	   */
1023	if (arp_mc_map(addr, buf, dev, 0) == 0)
1024		dev_mc_add(dev, buf);
1025}
1026
1027/*
1028 *	Remove a filter from a device
1029 */
1030
1031static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1032{
1033	char buf[MAX_ADDR_LEN];
1034	struct net_device *dev = in_dev->dev;
1035
1036	if (arp_mc_map(addr, buf, dev, 0) == 0)
1037		dev_mc_del(dev, buf);
1038}
1039
1040#ifdef CONFIG_IP_MULTICAST
1041/*
1042 * deleted ip_mc_list manipulation
1043 */
1044static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
 
1045{
1046	struct ip_mc_list *pmc;
 
1047
1048	/* this is an "ip_mc_list" for convenience; only the fields below
1049	 * are actually used. In particular, the refcnt and users are not
1050	 * used for management of the delete list. Using the same structure
1051	 * for deleted items allows change reports to use common code with
1052	 * non-deleted or query-response MCA's.
1053	 */
1054	pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1055	if (!pmc)
1056		return;
 
1057	spin_lock_bh(&im->lock);
1058	pmc->interface = im->interface;
1059	in_dev_hold(in_dev);
1060	pmc->multiaddr = im->multiaddr;
1061	pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1062		IGMP_Unsolicited_Report_Count;
1063	pmc->sfmode = im->sfmode;
1064	if (pmc->sfmode == MCAST_INCLUDE) {
1065		struct ip_sf_list *psf;
1066
1067		pmc->tomb = im->tomb;
1068		pmc->sources = im->sources;
1069		im->tomb = im->sources = NULL;
1070		for (psf=pmc->sources; psf; psf=psf->sf_next)
1071			psf->sf_crcount = pmc->crcount;
1072	}
1073	spin_unlock_bh(&im->lock);
1074
1075	spin_lock_bh(&in_dev->mc_tomb_lock);
1076	pmc->next = in_dev->mc_tomb;
1077	in_dev->mc_tomb = pmc;
1078	spin_unlock_bh(&in_dev->mc_tomb_lock);
1079}
1080
1081static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
 
 
 
1082{
1083	struct ip_mc_list *pmc, *pmc_prev;
1084	struct ip_sf_list *psf, *psf_next;
 
 
1085
1086	spin_lock_bh(&in_dev->mc_tomb_lock);
1087	pmc_prev = NULL;
1088	for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1089		if (pmc->multiaddr == multiaddr)
1090			break;
1091		pmc_prev = pmc;
1092	}
1093	if (pmc) {
1094		if (pmc_prev)
1095			pmc_prev->next = pmc->next;
1096		else
1097			in_dev->mc_tomb = pmc->next;
1098	}
1099	spin_unlock_bh(&in_dev->mc_tomb_lock);
 
 
1100	if (pmc) {
1101		for (psf=pmc->tomb; psf; psf=psf_next) {
1102			psf_next = psf->sf_next;
1103			kfree(psf);
 
 
 
 
 
1104		}
1105		in_dev_put(pmc->interface);
1106		kfree(pmc);
1107	}
 
1108}
1109
 
 
 
1110static void igmpv3_clear_delrec(struct in_device *in_dev)
1111{
1112	struct ip_mc_list *pmc, *nextpmc;
1113
1114	spin_lock_bh(&in_dev->mc_tomb_lock);
1115	pmc = in_dev->mc_tomb;
1116	in_dev->mc_tomb = NULL;
1117	spin_unlock_bh(&in_dev->mc_tomb_lock);
1118
1119	for (; pmc; pmc = nextpmc) {
1120		nextpmc = pmc->next;
1121		ip_mc_clear_src(pmc);
1122		in_dev_put(pmc->interface);
1123		kfree(pmc);
1124	}
1125	/* clear dead sources, too */
1126	rcu_read_lock();
1127	for_each_pmc_rcu(in_dev, pmc) {
1128		struct ip_sf_list *psf, *psf_next;
1129
1130		spin_lock_bh(&pmc->lock);
1131		psf = pmc->tomb;
1132		pmc->tomb = NULL;
1133		spin_unlock_bh(&pmc->lock);
1134		for (; psf; psf=psf_next) {
1135			psf_next = psf->sf_next;
1136			kfree(psf);
1137		}
1138	}
1139	rcu_read_unlock();
1140}
1141#endif
1142
1143static void igmp_group_dropped(struct ip_mc_list *im)
1144{
1145	struct in_device *in_dev = im->interface;
1146#ifdef CONFIG_IP_MULTICAST
 
1147	int reporter;
1148#endif
1149
1150	if (im->loaded) {
1151		im->loaded = 0;
1152		ip_mc_filter_del(in_dev, im->multiaddr);
1153	}
1154
1155#ifdef CONFIG_IP_MULTICAST
1156	if (im->multiaddr == IGMP_ALL_HOSTS)
1157		return;
 
 
1158
1159	reporter = im->reporter;
1160	igmp_stop_timer(im);
1161
1162	if (!in_dev->dead) {
1163		if (IGMP_V1_SEEN(in_dev))
1164			return;
1165		if (IGMP_V2_SEEN(in_dev)) {
1166			if (reporter)
1167				igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1168			return;
1169		}
1170		/* IGMPv3 */
1171		igmpv3_add_delrec(in_dev, im);
1172
1173		igmp_ifc_event(in_dev);
1174	}
1175#endif
1176}
1177
 
 
 
 
 
1178static void igmp_group_added(struct ip_mc_list *im)
1179{
1180	struct in_device *in_dev = im->interface;
 
 
 
1181
1182	if (im->loaded == 0) {
1183		im->loaded = 1;
1184		ip_mc_filter_add(in_dev, im->multiaddr);
1185	}
1186
1187#ifdef CONFIG_IP_MULTICAST
1188	if (im->multiaddr == IGMP_ALL_HOSTS)
1189		return;
 
 
1190
1191	if (in_dev->dead)
1192		return;
 
 
1193	if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1194		spin_lock_bh(&im->lock);
1195		igmp_start_timer(im, IGMP_Initial_Report_Delay);
1196		spin_unlock_bh(&im->lock);
1197		return;
1198	}
1199	/* else, v3 */
1200
1201	im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1202		IGMP_Unsolicited_Report_Count;
 
 
 
 
 
1203	igmp_ifc_event(in_dev);
1204#endif
1205}
1206
1207
1208/*
1209 *	Multicast list managers
1210 */
1211
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1212
1213/*
1214 *	A socket has joined a multicast group on device dev.
1215 */
1216
1217void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1218{
1219	struct ip_mc_list *im;
1220
1221	ASSERT_RTNL();
1222
1223	for_each_pmc_rtnl(in_dev, im) {
1224		if (im->multiaddr == addr) {
1225			im->users++;
1226			ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1227			goto out;
1228		}
1229	}
1230
1231	im = kzalloc(sizeof(*im), GFP_KERNEL);
1232	if (!im)
1233		goto out;
1234
1235	im->users = 1;
1236	im->interface = in_dev;
1237	in_dev_hold(in_dev);
1238	im->multiaddr = addr;
1239	/* initial mode is (EX, empty) */
1240	im->sfmode = MCAST_EXCLUDE;
1241	im->sfcount[MCAST_EXCLUDE] = 1;
1242	atomic_set(&im->refcnt, 1);
1243	spin_lock_init(&im->lock);
1244#ifdef CONFIG_IP_MULTICAST
1245	setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1246	im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1247#endif
1248
1249	im->next_rcu = in_dev->mc_list;
1250	in_dev->mc_count++;
1251	rcu_assign_pointer(in_dev->mc_list, im);
1252
 
 
1253#ifdef CONFIG_IP_MULTICAST
1254	igmpv3_del_delrec(in_dev, im->multiaddr);
1255#endif
1256	igmp_group_added(im);
1257	if (!in_dev->dead)
1258		ip_rt_multicast_event(in_dev);
1259out:
1260	return;
1261}
 
 
 
 
 
 
 
 
 
 
 
1262EXPORT_SYMBOL(ip_mc_inc_group);
1263
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1264/*
1265 *	Resend IGMP JOIN report; used for bonding.
1266 *	Called with rcu_read_lock()
1267 */
1268void ip_mc_rejoin_groups(struct in_device *in_dev)
1269{
1270#ifdef CONFIG_IP_MULTICAST
1271	struct ip_mc_list *im;
1272	int type;
 
1273
1274	for_each_pmc_rcu(in_dev, im) {
 
 
1275		if (im->multiaddr == IGMP_ALL_HOSTS)
1276			continue;
 
 
 
1277
1278		/* a failover is happening and switches
1279		 * must be notified immediately
1280		 */
1281		if (IGMP_V1_SEEN(in_dev))
1282			type = IGMP_HOST_MEMBERSHIP_REPORT;
1283		else if (IGMP_V2_SEEN(in_dev))
1284			type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1285		else
1286			type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1287		igmp_send_report(in_dev, im, type);
1288	}
1289#endif
1290}
1291EXPORT_SYMBOL(ip_mc_rejoin_groups);
1292
1293/*
1294 *	A socket has left a multicast group on device dev
1295 */
1296
1297void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1298{
1299	struct ip_mc_list *i;
1300	struct ip_mc_list __rcu **ip;
1301
1302	ASSERT_RTNL();
1303
1304	for (ip = &in_dev->mc_list;
1305	     (i = rtnl_dereference(*ip)) != NULL;
1306	     ip = &i->next_rcu) {
1307		if (i->multiaddr == addr) {
1308			if (--i->users == 0) {
 
1309				*ip = i->next_rcu;
1310				in_dev->mc_count--;
1311				igmp_group_dropped(i);
1312				ip_mc_clear_src(i);
1313
1314				if (!in_dev->dead)
1315					ip_rt_multicast_event(in_dev);
1316
1317				ip_ma_put(i);
1318				return;
1319			}
1320			break;
1321		}
1322	}
1323}
1324EXPORT_SYMBOL(ip_mc_dec_group);
1325
1326/* Device changing type */
1327
1328void ip_mc_unmap(struct in_device *in_dev)
1329{
1330	struct ip_mc_list *pmc;
1331
1332	ASSERT_RTNL();
1333
1334	for_each_pmc_rtnl(in_dev, pmc)
1335		igmp_group_dropped(pmc);
1336}
1337
1338void ip_mc_remap(struct in_device *in_dev)
1339{
1340	struct ip_mc_list *pmc;
1341
1342	ASSERT_RTNL();
1343
1344	for_each_pmc_rtnl(in_dev, pmc)
 
 
 
1345		igmp_group_added(pmc);
 
1346}
1347
1348/* Device going down */
1349
1350void ip_mc_down(struct in_device *in_dev)
1351{
1352	struct ip_mc_list *pmc;
1353
1354	ASSERT_RTNL();
1355
1356	for_each_pmc_rtnl(in_dev, pmc)
1357		igmp_group_dropped(pmc);
1358
1359#ifdef CONFIG_IP_MULTICAST
1360	in_dev->mr_ifc_count = 0;
1361	if (del_timer(&in_dev->mr_ifc_timer))
1362		__in_dev_put(in_dev);
1363	in_dev->mr_gq_running = 0;
1364	if (del_timer(&in_dev->mr_gq_timer))
1365		__in_dev_put(in_dev);
1366	igmpv3_clear_delrec(in_dev);
1367#endif
1368
1369	ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1370}
1371
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1372void ip_mc_init_dev(struct in_device *in_dev)
1373{
1374	ASSERT_RTNL();
1375
1376	in_dev->mc_tomb = NULL;
1377#ifdef CONFIG_IP_MULTICAST
1378	in_dev->mr_gq_running = 0;
1379	setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1380			(unsigned long)in_dev);
1381	in_dev->mr_ifc_count = 0;
1382	in_dev->mc_count     = 0;
1383	setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1384			(unsigned long)in_dev);
1385	in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1386#endif
 
1387
1388	spin_lock_init(&in_dev->mc_tomb_lock);
1389}
1390
1391/* Device going up */
1392
1393void ip_mc_up(struct in_device *in_dev)
1394{
1395	struct ip_mc_list *pmc;
1396
1397	ASSERT_RTNL();
1398
 
1399	ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1400
1401	for_each_pmc_rtnl(in_dev, pmc)
 
 
 
1402		igmp_group_added(pmc);
 
1403}
1404
1405/*
1406 *	Device is about to be destroyed: clean up.
1407 */
1408
1409void ip_mc_destroy_dev(struct in_device *in_dev)
1410{
1411	struct ip_mc_list *i;
1412
1413	ASSERT_RTNL();
1414
1415	/* Deactivate timers */
1416	ip_mc_down(in_dev);
 
 
 
1417
1418	while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1419		in_dev->mc_list = i->next_rcu;
1420		in_dev->mc_count--;
1421
1422		/* We've dropped the groups in ip_mc_down already */
1423		ip_mc_clear_src(i);
1424		ip_ma_put(i);
1425	}
1426}
1427
1428/* RTNL is locked */
1429static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1430{
1431	struct net_device *dev = NULL;
1432	struct in_device *idev = NULL;
1433
1434	if (imr->imr_ifindex) {
1435		idev = inetdev_by_index(net, imr->imr_ifindex);
1436		return idev;
1437	}
1438	if (imr->imr_address.s_addr) {
1439		dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1440		if (!dev)
1441			return NULL;
1442	}
1443
1444	if (!dev) {
1445		struct rtable *rt = ip_route_output(net,
1446						    imr->imr_multiaddr.s_addr,
1447						    0, 0, 0);
1448		if (!IS_ERR(rt)) {
1449			dev = rt->dst.dev;
1450			ip_rt_put(rt);
1451		}
1452	}
1453	if (dev) {
1454		imr->imr_ifindex = dev->ifindex;
1455		idev = __in_dev_get_rtnl(dev);
1456	}
1457	return idev;
1458}
1459
1460/*
1461 *	Join a socket to a group
1462 */
1463int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1464int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1465
1466
1467static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1468	__be32 *psfsrc)
1469{
1470	struct ip_sf_list *psf, *psf_prev;
1471	int rv = 0;
1472
1473	psf_prev = NULL;
1474	for (psf=pmc->sources; psf; psf=psf->sf_next) {
1475		if (psf->sf_inaddr == *psfsrc)
1476			break;
1477		psf_prev = psf;
1478	}
1479	if (!psf || psf->sf_count[sfmode] == 0) {
1480		/* source filter not found, or count wrong =>  bug */
1481		return -ESRCH;
1482	}
1483	psf->sf_count[sfmode]--;
1484	if (psf->sf_count[sfmode] == 0) {
1485		ip_rt_multicast_event(pmc->interface);
1486	}
1487	if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1488#ifdef CONFIG_IP_MULTICAST
1489		struct in_device *in_dev = pmc->interface;
 
1490#endif
1491
1492		/* no more filters for this source */
1493		if (psf_prev)
1494			psf_prev->sf_next = psf->sf_next;
1495		else
1496			pmc->sources = psf->sf_next;
1497#ifdef CONFIG_IP_MULTICAST
1498		if (psf->sf_oldin &&
1499		    !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1500			psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1501				IGMP_Unsolicited_Report_Count;
1502			psf->sf_next = pmc->tomb;
1503			pmc->tomb = psf;
1504			rv = 1;
1505		} else
1506#endif
1507			kfree(psf);
1508	}
1509	return rv;
1510}
1511
1512#ifndef CONFIG_IP_MULTICAST
1513#define igmp_ifc_event(x)	do { } while (0)
1514#endif
1515
1516static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1517			 int sfcount, __be32 *psfsrc, int delta)
1518{
1519	struct ip_mc_list *pmc;
1520	int	changerec = 0;
1521	int	i, err;
1522
1523	if (!in_dev)
1524		return -ENODEV;
1525	rcu_read_lock();
1526	for_each_pmc_rcu(in_dev, pmc) {
1527		if (*pmca == pmc->multiaddr)
1528			break;
1529	}
1530	if (!pmc) {
1531		/* MCA not found?? bug */
1532		rcu_read_unlock();
1533		return -ESRCH;
1534	}
1535	spin_lock_bh(&pmc->lock);
1536	rcu_read_unlock();
1537#ifdef CONFIG_IP_MULTICAST
1538	sf_markstate(pmc);
1539#endif
1540	if (!delta) {
1541		err = -EINVAL;
1542		if (!pmc->sfcount[sfmode])
1543			goto out_unlock;
1544		pmc->sfcount[sfmode]--;
1545	}
1546	err = 0;
1547	for (i=0; i<sfcount; i++) {
1548		int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1549
1550		changerec |= rv > 0;
1551		if (!err && rv < 0)
1552			err = rv;
1553	}
1554	if (pmc->sfmode == MCAST_EXCLUDE &&
1555	    pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1556	    pmc->sfcount[MCAST_INCLUDE]) {
1557#ifdef CONFIG_IP_MULTICAST
1558		struct ip_sf_list *psf;
 
1559#endif
1560
1561		/* filter mode change */
1562		pmc->sfmode = MCAST_INCLUDE;
1563#ifdef CONFIG_IP_MULTICAST
1564		pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1565			IGMP_Unsolicited_Report_Count;
1566		in_dev->mr_ifc_count = pmc->crcount;
1567		for (psf=pmc->sources; psf; psf = psf->sf_next)
1568			psf->sf_crcount = 0;
1569		igmp_ifc_event(pmc->interface);
1570	} else if (sf_setstate(pmc) || changerec) {
1571		igmp_ifc_event(pmc->interface);
1572#endif
1573	}
1574out_unlock:
1575	spin_unlock_bh(&pmc->lock);
1576	return err;
1577}
1578
1579/*
1580 * Add multicast single-source filter to the interface list
1581 */
1582static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1583	__be32 *psfsrc)
1584{
1585	struct ip_sf_list *psf, *psf_prev;
1586
1587	psf_prev = NULL;
1588	for (psf=pmc->sources; psf; psf=psf->sf_next) {
1589		if (psf->sf_inaddr == *psfsrc)
1590			break;
1591		psf_prev = psf;
1592	}
1593	if (!psf) {
1594		psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1595		if (!psf)
1596			return -ENOBUFS;
1597		psf->sf_inaddr = *psfsrc;
1598		if (psf_prev) {
1599			psf_prev->sf_next = psf;
1600		} else
1601			pmc->sources = psf;
1602	}
1603	psf->sf_count[sfmode]++;
1604	if (psf->sf_count[sfmode] == 1) {
1605		ip_rt_multicast_event(pmc->interface);
1606	}
1607	return 0;
1608}
1609
1610#ifdef CONFIG_IP_MULTICAST
1611static void sf_markstate(struct ip_mc_list *pmc)
1612{
1613	struct ip_sf_list *psf;
1614	int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1615
1616	for (psf=pmc->sources; psf; psf=psf->sf_next)
1617		if (pmc->sfcount[MCAST_EXCLUDE]) {
1618			psf->sf_oldin = mca_xcount ==
1619				psf->sf_count[MCAST_EXCLUDE] &&
1620				!psf->sf_count[MCAST_INCLUDE];
1621		} else
1622			psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1623}
1624
1625static int sf_setstate(struct ip_mc_list *pmc)
1626{
1627	struct ip_sf_list *psf, *dpsf;
1628	int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1629	int qrv = pmc->interface->mr_qrv;
1630	int new_in, rv;
1631
1632	rv = 0;
1633	for (psf=pmc->sources; psf; psf=psf->sf_next) {
1634		if (pmc->sfcount[MCAST_EXCLUDE]) {
1635			new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1636				!psf->sf_count[MCAST_INCLUDE];
1637		} else
1638			new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1639		if (new_in) {
1640			if (!psf->sf_oldin) {
1641				struct ip_sf_list *prev = NULL;
1642
1643				for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1644					if (dpsf->sf_inaddr == psf->sf_inaddr)
1645						break;
1646					prev = dpsf;
1647				}
1648				if (dpsf) {
1649					if (prev)
1650						prev->sf_next = dpsf->sf_next;
1651					else
1652						pmc->tomb = dpsf->sf_next;
1653					kfree(dpsf);
1654				}
1655				psf->sf_crcount = qrv;
1656				rv++;
1657			}
1658		} else if (psf->sf_oldin) {
1659
1660			psf->sf_crcount = 0;
1661			/*
1662			 * add or update "delete" records if an active filter
1663			 * is now inactive
1664			 */
1665			for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1666				if (dpsf->sf_inaddr == psf->sf_inaddr)
1667					break;
1668			if (!dpsf) {
1669				dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1670				if (!dpsf)
1671					continue;
1672				*dpsf = *psf;
1673				/* pmc->lock held by callers */
1674				dpsf->sf_next = pmc->tomb;
1675				pmc->tomb = dpsf;
1676			}
1677			dpsf->sf_crcount = qrv;
1678			rv++;
1679		}
1680	}
1681	return rv;
1682}
1683#endif
1684
1685/*
1686 * Add multicast source filter list to the interface list
1687 */
1688static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1689			 int sfcount, __be32 *psfsrc, int delta)
1690{
1691	struct ip_mc_list *pmc;
1692	int	isexclude;
1693	int	i, err;
1694
1695	if (!in_dev)
1696		return -ENODEV;
1697	rcu_read_lock();
1698	for_each_pmc_rcu(in_dev, pmc) {
1699		if (*pmca == pmc->multiaddr)
1700			break;
1701	}
1702	if (!pmc) {
1703		/* MCA not found?? bug */
1704		rcu_read_unlock();
1705		return -ESRCH;
1706	}
1707	spin_lock_bh(&pmc->lock);
1708	rcu_read_unlock();
1709
1710#ifdef CONFIG_IP_MULTICAST
1711	sf_markstate(pmc);
1712#endif
1713	isexclude = pmc->sfmode == MCAST_EXCLUDE;
1714	if (!delta)
1715		pmc->sfcount[sfmode]++;
1716	err = 0;
1717	for (i=0; i<sfcount; i++) {
1718		err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1719		if (err)
1720			break;
1721	}
1722	if (err) {
1723		int j;
1724
1725		if (!delta)
1726			pmc->sfcount[sfmode]--;
1727		for (j=0; j<i; j++)
1728			(void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1729	} else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1730#ifdef CONFIG_IP_MULTICAST
1731		struct ip_sf_list *psf;
 
1732		in_dev = pmc->interface;
1733#endif
1734
1735		/* filter mode change */
1736		if (pmc->sfcount[MCAST_EXCLUDE])
1737			pmc->sfmode = MCAST_EXCLUDE;
1738		else if (pmc->sfcount[MCAST_INCLUDE])
1739			pmc->sfmode = MCAST_INCLUDE;
1740#ifdef CONFIG_IP_MULTICAST
1741		/* else no filters; keep old mode for reports */
1742
1743		pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1744			IGMP_Unsolicited_Report_Count;
1745		in_dev->mr_ifc_count = pmc->crcount;
1746		for (psf=pmc->sources; psf; psf = psf->sf_next)
1747			psf->sf_crcount = 0;
1748		igmp_ifc_event(in_dev);
1749	} else if (sf_setstate(pmc)) {
1750		igmp_ifc_event(in_dev);
1751#endif
1752	}
1753	spin_unlock_bh(&pmc->lock);
1754	return err;
1755}
1756
1757static void ip_mc_clear_src(struct ip_mc_list *pmc)
1758{
1759	struct ip_sf_list *psf, *nextpsf;
1760
1761	for (psf=pmc->tomb; psf; psf=nextpsf) {
1762		nextpsf = psf->sf_next;
1763		kfree(psf);
1764	}
1765	pmc->tomb = NULL;
1766	for (psf=pmc->sources; psf; psf=nextpsf) {
1767		nextpsf = psf->sf_next;
1768		kfree(psf);
1769	}
1770	pmc->sources = NULL;
1771	pmc->sfmode = MCAST_EXCLUDE;
1772	pmc->sfcount[MCAST_INCLUDE] = 0;
1773	pmc->sfcount[MCAST_EXCLUDE] = 1;
1774}
1775
 
 
 
1776
1777/*
1778 * Join a multicast group
1779 */
1780int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
 
1781{
1782	int err;
1783	__be32 addr = imr->imr_multiaddr.s_addr;
1784	struct ip_mc_socklist *iml = NULL, *i;
1785	struct in_device *in_dev;
1786	struct inet_sock *inet = inet_sk(sk);
1787	struct net *net = sock_net(sk);
1788	int ifindex;
1789	int count = 0;
 
 
 
1790
1791	if (!ipv4_is_multicast(addr))
1792		return -EINVAL;
1793
1794	rtnl_lock();
1795
1796	in_dev = ip_mc_find_dev(net, imr);
1797
1798	if (!in_dev) {
1799		iml = NULL;
1800		err = -ENODEV;
1801		goto done;
1802	}
1803
1804	err = -EADDRINUSE;
1805	ifindex = imr->imr_ifindex;
1806	for_each_pmc_rtnl(inet, i) {
1807		if (i->multi.imr_multiaddr.s_addr == addr &&
1808		    i->multi.imr_ifindex == ifindex)
1809			goto done;
1810		count++;
1811	}
1812	err = -ENOBUFS;
1813	if (count >= sysctl_igmp_max_memberships)
1814		goto done;
1815	iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1816	if (iml == NULL)
1817		goto done;
1818
1819	memcpy(&iml->multi, imr, sizeof(*imr));
1820	iml->next_rcu = inet->mc_list;
1821	iml->sflist = NULL;
1822	iml->sfmode = MCAST_EXCLUDE;
1823	rcu_assign_pointer(inet->mc_list, iml);
1824	ip_mc_inc_group(in_dev, addr);
1825	err = 0;
1826done:
1827	rtnl_unlock();
1828	return err;
1829}
 
 
 
 
 
 
 
1830EXPORT_SYMBOL(ip_mc_join_group);
1831
 
 
 
 
 
 
 
 
1832static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1833			   struct in_device *in_dev)
1834{
1835	struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1836	int err;
1837
1838	if (psf == NULL) {
1839		/* any-source empty exclude case */
1840		return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1841			iml->sfmode, 0, NULL, 0);
1842	}
1843	err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1844			iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1845	RCU_INIT_POINTER(iml->sflist, NULL);
1846	/* decrease mem now to avoid the memleak warning */
1847	atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1848	kfree_rcu(psf, rcu);
1849	return err;
1850}
1851
1852/*
1853 *	Ask a socket to leave a group.
1854 */
1855
1856int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1857{
1858	struct inet_sock *inet = inet_sk(sk);
1859	struct ip_mc_socklist *iml;
1860	struct ip_mc_socklist __rcu **imlp;
1861	struct in_device *in_dev;
1862	struct net *net = sock_net(sk);
1863	__be32 group = imr->imr_multiaddr.s_addr;
1864	u32 ifindex;
1865	int ret = -EADDRNOTAVAIL;
1866
1867	rtnl_lock();
 
1868	in_dev = ip_mc_find_dev(net, imr);
 
 
 
 
1869	ifindex = imr->imr_ifindex;
1870	for (imlp = &inet->mc_list;
1871	     (iml = rtnl_dereference(*imlp)) != NULL;
1872	     imlp = &iml->next_rcu) {
1873		if (iml->multi.imr_multiaddr.s_addr != group)
1874			continue;
1875		if (ifindex) {
1876			if (iml->multi.imr_ifindex != ifindex)
1877				continue;
1878		} else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1879				iml->multi.imr_address.s_addr)
1880			continue;
1881
1882		(void) ip_mc_leave_src(sk, iml, in_dev);
1883
1884		*imlp = iml->next_rcu;
1885
1886		if (in_dev)
1887			ip_mc_dec_group(in_dev, group);
1888		rtnl_unlock();
1889		/* decrease mem now to avoid the memleak warning */
1890		atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1891		kfree_rcu(iml, rcu);
1892		return 0;
1893	}
1894	if (!in_dev)
1895		ret = -ENODEV;
1896	rtnl_unlock();
1897	return ret;
1898}
 
1899
1900int ip_mc_source(int add, int omode, struct sock *sk, struct
1901	ip_mreq_source *mreqs, int ifindex)
1902{
1903	int err;
1904	struct ip_mreqn imr;
1905	__be32 addr = mreqs->imr_multiaddr;
1906	struct ip_mc_socklist *pmc;
1907	struct in_device *in_dev = NULL;
1908	struct inet_sock *inet = inet_sk(sk);
1909	struct ip_sf_socklist *psl;
1910	struct net *net = sock_net(sk);
1911	int leavegroup = 0;
1912	int i, j, rv;
1913
1914	if (!ipv4_is_multicast(addr))
1915		return -EINVAL;
1916
1917	rtnl_lock();
1918
1919	imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1920	imr.imr_address.s_addr = mreqs->imr_interface;
1921	imr.imr_ifindex = ifindex;
1922	in_dev = ip_mc_find_dev(net, &imr);
1923
1924	if (!in_dev) {
1925		err = -ENODEV;
1926		goto done;
1927	}
1928	err = -EADDRNOTAVAIL;
1929
1930	for_each_pmc_rtnl(inet, pmc) {
1931		if ((pmc->multi.imr_multiaddr.s_addr ==
1932		     imr.imr_multiaddr.s_addr) &&
1933		    (pmc->multi.imr_ifindex == imr.imr_ifindex))
1934			break;
1935	}
1936	if (!pmc) {		/* must have a prior join */
1937		err = -EINVAL;
1938		goto done;
1939	}
1940	/* if a source filter was set, must be the same mode as before */
1941	if (pmc->sflist) {
1942		if (pmc->sfmode != omode) {
1943			err = -EINVAL;
1944			goto done;
1945		}
1946	} else if (pmc->sfmode != omode) {
1947		/* allow mode switches for empty-set filters */
1948		ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1949		ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1950			NULL, 0);
1951		pmc->sfmode = omode;
1952	}
1953
1954	psl = rtnl_dereference(pmc->sflist);
1955	if (!add) {
1956		if (!psl)
1957			goto done;	/* err = -EADDRNOTAVAIL */
1958		rv = !0;
1959		for (i=0; i<psl->sl_count; i++) {
1960			rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1961				sizeof(__be32));
1962			if (rv == 0)
1963				break;
1964		}
1965		if (rv)		/* source not found */
1966			goto done;	/* err = -EADDRNOTAVAIL */
1967
1968		/* special case - (INCLUDE, empty) == LEAVE_GROUP */
1969		if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1970			leavegroup = 1;
1971			goto done;
1972		}
1973
1974		/* update the interface filter */
1975		ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1976			&mreqs->imr_sourceaddr, 1);
1977
1978		for (j=i+1; j<psl->sl_count; j++)
1979			psl->sl_addr[j-1] = psl->sl_addr[j];
1980		psl->sl_count--;
1981		err = 0;
1982		goto done;
1983	}
1984	/* else, add a new source to the filter */
1985
1986	if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1987		err = -ENOBUFS;
1988		goto done;
1989	}
1990	if (!psl || psl->sl_count == psl->sl_max) {
1991		struct ip_sf_socklist *newpsl;
1992		int count = IP_SFBLOCK;
1993
1994		if (psl)
1995			count += psl->sl_max;
1996		newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
1997		if (!newpsl) {
1998			err = -ENOBUFS;
1999			goto done;
2000		}
2001		newpsl->sl_max = count;
2002		newpsl->sl_count = count - IP_SFBLOCK;
2003		if (psl) {
2004			for (i=0; i<psl->sl_count; i++)
2005				newpsl->sl_addr[i] = psl->sl_addr[i];
2006			/* decrease mem now to avoid the memleak warning */
2007			atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2008			kfree_rcu(psl, rcu);
2009		}
2010		rcu_assign_pointer(pmc->sflist, newpsl);
2011		psl = newpsl;
2012	}
2013	rv = 1;	/* > 0 for insert logic below if sl_count is 0 */
2014	for (i=0; i<psl->sl_count; i++) {
2015		rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2016			sizeof(__be32));
2017		if (rv == 0)
2018			break;
2019	}
2020	if (rv == 0)		/* address already there is an error */
2021		goto done;
2022	for (j=psl->sl_count-1; j>=i; j--)
2023		psl->sl_addr[j+1] = psl->sl_addr[j];
2024	psl->sl_addr[i] = mreqs->imr_sourceaddr;
2025	psl->sl_count++;
2026	err = 0;
2027	/* update the interface list */
2028	ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2029		&mreqs->imr_sourceaddr, 1);
2030done:
2031	rtnl_unlock();
2032	if (leavegroup)
2033		return ip_mc_leave_group(sk, &imr);
2034	return err;
2035}
2036
2037int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2038{
2039	int err = 0;
2040	struct ip_mreqn	imr;
2041	__be32 addr = msf->imsf_multiaddr;
2042	struct ip_mc_socklist *pmc;
2043	struct in_device *in_dev;
2044	struct inet_sock *inet = inet_sk(sk);
2045	struct ip_sf_socklist *newpsl, *psl;
2046	struct net *net = sock_net(sk);
2047	int leavegroup = 0;
2048
2049	if (!ipv4_is_multicast(addr))
2050		return -EINVAL;
2051	if (msf->imsf_fmode != MCAST_INCLUDE &&
2052	    msf->imsf_fmode != MCAST_EXCLUDE)
2053		return -EINVAL;
2054
2055	rtnl_lock();
2056
2057	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2058	imr.imr_address.s_addr = msf->imsf_interface;
2059	imr.imr_ifindex = ifindex;
2060	in_dev = ip_mc_find_dev(net, &imr);
2061
2062	if (!in_dev) {
2063		err = -ENODEV;
2064		goto done;
2065	}
2066
2067	/* special case - (INCLUDE, empty) == LEAVE_GROUP */
2068	if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2069		leavegroup = 1;
2070		goto done;
2071	}
2072
2073	for_each_pmc_rtnl(inet, pmc) {
2074		if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2075		    pmc->multi.imr_ifindex == imr.imr_ifindex)
2076			break;
2077	}
2078	if (!pmc) {		/* must have a prior join */
2079		err = -EINVAL;
2080		goto done;
2081	}
2082	if (msf->imsf_numsrc) {
2083		newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2084							   GFP_KERNEL);
2085		if (!newpsl) {
2086			err = -ENOBUFS;
2087			goto done;
2088		}
2089		newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2090		memcpy(newpsl->sl_addr, msf->imsf_slist,
2091			msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2092		err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2093			msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2094		if (err) {
2095			sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2096			goto done;
2097		}
2098	} else {
2099		newpsl = NULL;
2100		(void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2101				     msf->imsf_fmode, 0, NULL, 0);
2102	}
2103	psl = rtnl_dereference(pmc->sflist);
2104	if (psl) {
2105		(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2106			psl->sl_count, psl->sl_addr, 0);
2107		/* decrease mem now to avoid the memleak warning */
2108		atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2109		kfree_rcu(psl, rcu);
2110	} else
2111		(void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2112			0, NULL, 0);
2113	rcu_assign_pointer(pmc->sflist, newpsl);
2114	pmc->sfmode = msf->imsf_fmode;
2115	err = 0;
2116done:
2117	rtnl_unlock();
2118	if (leavegroup)
2119		err = ip_mc_leave_group(sk, &imr);
2120	return err;
2121}
2122
2123int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2124	struct ip_msfilter __user *optval, int __user *optlen)
2125{
2126	int err, len, count, copycount;
2127	struct ip_mreqn	imr;
2128	__be32 addr = msf->imsf_multiaddr;
2129	struct ip_mc_socklist *pmc;
2130	struct in_device *in_dev;
2131	struct inet_sock *inet = inet_sk(sk);
2132	struct ip_sf_socklist *psl;
2133	struct net *net = sock_net(sk);
2134
 
 
2135	if (!ipv4_is_multicast(addr))
2136		return -EINVAL;
2137
2138	rtnl_lock();
2139
2140	imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2141	imr.imr_address.s_addr = msf->imsf_interface;
2142	imr.imr_ifindex = 0;
2143	in_dev = ip_mc_find_dev(net, &imr);
2144
2145	if (!in_dev) {
2146		err = -ENODEV;
2147		goto done;
2148	}
2149	err = -EADDRNOTAVAIL;
2150
2151	for_each_pmc_rtnl(inet, pmc) {
2152		if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2153		    pmc->multi.imr_ifindex == imr.imr_ifindex)
2154			break;
2155	}
2156	if (!pmc)		/* must have a prior join */
2157		goto done;
2158	msf->imsf_fmode = pmc->sfmode;
2159	psl = rtnl_dereference(pmc->sflist);
2160	rtnl_unlock();
2161	if (!psl) {
2162		len = 0;
2163		count = 0;
2164	} else {
2165		count = psl->sl_count;
2166	}
2167	copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2168	len = copycount * sizeof(psl->sl_addr[0]);
2169	msf->imsf_numsrc = count;
2170	if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2171	    copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2172		return -EFAULT;
2173	}
2174	if (len &&
2175	    copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2176		return -EFAULT;
2177	return 0;
2178done:
2179	rtnl_unlock();
2180	return err;
2181}
2182
2183int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2184	struct group_filter __user *optval, int __user *optlen)
2185{
2186	int err, i, count, copycount;
2187	struct sockaddr_in *psin;
2188	__be32 addr;
2189	struct ip_mc_socklist *pmc;
2190	struct inet_sock *inet = inet_sk(sk);
2191	struct ip_sf_socklist *psl;
2192
 
 
2193	psin = (struct sockaddr_in *)&gsf->gf_group;
2194	if (psin->sin_family != AF_INET)
2195		return -EINVAL;
2196	addr = psin->sin_addr.s_addr;
2197	if (!ipv4_is_multicast(addr))
2198		return -EINVAL;
2199
2200	rtnl_lock();
2201
2202	err = -EADDRNOTAVAIL;
2203
2204	for_each_pmc_rtnl(inet, pmc) {
2205		if (pmc->multi.imr_multiaddr.s_addr == addr &&
2206		    pmc->multi.imr_ifindex == gsf->gf_interface)
2207			break;
2208	}
2209	if (!pmc)		/* must have a prior join */
2210		goto done;
2211	gsf->gf_fmode = pmc->sfmode;
2212	psl = rtnl_dereference(pmc->sflist);
2213	rtnl_unlock();
2214	count = psl ? psl->sl_count : 0;
2215	copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2216	gsf->gf_numsrc = count;
2217	if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2218	    copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2219		return -EFAULT;
2220	}
2221	for (i=0; i<copycount; i++) {
2222		struct sockaddr_storage ss;
2223
2224		psin = (struct sockaddr_in *)&ss;
2225		memset(&ss, 0, sizeof(ss));
2226		psin->sin_family = AF_INET;
2227		psin->sin_addr.s_addr = psl->sl_addr[i];
2228		if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2229			return -EFAULT;
2230	}
2231	return 0;
2232done:
2233	rtnl_unlock();
2234	return err;
2235}
2236
2237/*
2238 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2239 */
2240int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
 
2241{
2242	struct inet_sock *inet = inet_sk(sk);
2243	struct ip_mc_socklist *pmc;
2244	struct ip_sf_socklist *psl;
2245	int i;
2246	int ret;
2247
2248	ret = 1;
2249	if (!ipv4_is_multicast(loc_addr))
2250		goto out;
2251
2252	rcu_read_lock();
2253	for_each_pmc_rcu(inet, pmc) {
2254		if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2255		    pmc->multi.imr_ifindex == dif)
 
2256			break;
2257	}
2258	ret = inet->mc_all;
2259	if (!pmc)
2260		goto unlock;
2261	psl = rcu_dereference(pmc->sflist);
2262	ret = (pmc->sfmode == MCAST_EXCLUDE);
2263	if (!psl)
2264		goto unlock;
2265
2266	for (i=0; i<psl->sl_count; i++) {
2267		if (psl->sl_addr[i] == rmt_addr)
2268			break;
2269	}
2270	ret = 0;
2271	if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2272		goto unlock;
2273	if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2274		goto unlock;
2275	ret = 1;
2276unlock:
2277	rcu_read_unlock();
2278out:
2279	return ret;
2280}
2281
2282/*
2283 *	A socket is closing.
2284 */
2285
2286void ip_mc_drop_socket(struct sock *sk)
2287{
2288	struct inet_sock *inet = inet_sk(sk);
2289	struct ip_mc_socklist *iml;
2290	struct net *net = sock_net(sk);
2291
2292	if (inet->mc_list == NULL)
2293		return;
2294
2295	rtnl_lock();
2296	while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2297		struct in_device *in_dev;
2298
2299		inet->mc_list = iml->next_rcu;
2300		in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2301		(void) ip_mc_leave_src(sk, iml, in_dev);
2302		if (in_dev != NULL)
2303			ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2304		/* decrease mem now to avoid the memleak warning */
2305		atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2306		kfree_rcu(iml, rcu);
2307	}
2308	rtnl_unlock();
2309}
2310
2311/* called with rcu_read_lock() */
2312int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2313{
2314	struct ip_mc_list *im;
 
2315	struct ip_sf_list *psf;
2316	int rv = 0;
2317
2318	for_each_pmc_rcu(in_dev, im) {
2319		if (im->multiaddr == mc_addr)
2320			break;
 
 
 
 
 
 
 
 
 
 
 
 
2321	}
2322	if (im && proto == IPPROTO_IGMP) {
2323		rv = 1;
2324	} else if (im) {
2325		if (src_addr) {
2326			for (psf=im->sources; psf; psf=psf->sf_next) {
2327				if (psf->sf_inaddr == src_addr)
2328					break;
2329			}
2330			if (psf)
2331				rv = psf->sf_count[MCAST_INCLUDE] ||
2332					psf->sf_count[MCAST_EXCLUDE] !=
2333					im->sfcount[MCAST_EXCLUDE];
2334			else
2335				rv = im->sfcount[MCAST_EXCLUDE] != 0;
2336		} else
2337			rv = 1; /* unspecified source; tentatively allow */
2338	}
2339	return rv;
2340}
2341
2342#if defined(CONFIG_PROC_FS)
2343struct igmp_mc_iter_state {
2344	struct seq_net_private p;
2345	struct net_device *dev;
2346	struct in_device *in_dev;
2347};
2348
2349#define	igmp_mc_seq_private(seq)	((struct igmp_mc_iter_state *)(seq)->private)
2350
2351static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2352{
2353	struct net *net = seq_file_net(seq);
2354	struct ip_mc_list *im = NULL;
2355	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2356
2357	state->in_dev = NULL;
2358	for_each_netdev_rcu(net, state->dev) {
2359		struct in_device *in_dev;
2360
2361		in_dev = __in_dev_get_rcu(state->dev);
2362		if (!in_dev)
2363			continue;
2364		im = rcu_dereference(in_dev->mc_list);
2365		if (im) {
2366			state->in_dev = in_dev;
2367			break;
2368		}
2369	}
2370	return im;
2371}
2372
2373static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2374{
2375	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2376
2377	im = rcu_dereference(im->next_rcu);
2378	while (!im) {
2379		state->dev = next_net_device_rcu(state->dev);
2380		if (!state->dev) {
2381			state->in_dev = NULL;
2382			break;
2383		}
2384		state->in_dev = __in_dev_get_rcu(state->dev);
2385		if (!state->in_dev)
2386			continue;
2387		im = rcu_dereference(state->in_dev->mc_list);
2388	}
2389	return im;
2390}
2391
2392static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2393{
2394	struct ip_mc_list *im = igmp_mc_get_first(seq);
2395	if (im)
2396		while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2397			--pos;
2398	return pos ? NULL : im;
2399}
2400
2401static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2402	__acquires(rcu)
2403{
2404	rcu_read_lock();
2405	return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2406}
2407
2408static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2409{
2410	struct ip_mc_list *im;
2411	if (v == SEQ_START_TOKEN)
2412		im = igmp_mc_get_first(seq);
2413	else
2414		im = igmp_mc_get_next(seq, v);
2415	++*pos;
2416	return im;
2417}
2418
2419static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2420	__releases(rcu)
2421{
2422	struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2423
2424	state->in_dev = NULL;
2425	state->dev = NULL;
2426	rcu_read_unlock();
2427}
2428
2429static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2430{
2431	if (v == SEQ_START_TOKEN)
2432		seq_puts(seq,
2433			 "Idx\tDevice    : Count Querier\tGroup    Users Timer\tReporter\n");
2434	else {
2435		struct ip_mc_list *im = (struct ip_mc_list *)v;
2436		struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2437		char   *querier;
 
 
2438#ifdef CONFIG_IP_MULTICAST
2439		querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2440			  IGMP_V2_SEEN(state->in_dev) ? "V2" :
2441			  "V3";
2442#else
2443		querier = "NONE";
2444#endif
2445
2446		if (rcu_dereference(state->in_dev->mc_list) == im) {
2447			seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2448				   state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2449		}
2450
 
2451		seq_printf(seq,
2452			   "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2453			   im->multiaddr, im->users,
2454			   im->tm_running, im->tm_running ?
2455			   jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2456			   im->reporter);
2457	}
2458	return 0;
2459}
2460
2461static const struct seq_operations igmp_mc_seq_ops = {
2462	.start	=	igmp_mc_seq_start,
2463	.next	=	igmp_mc_seq_next,
2464	.stop	=	igmp_mc_seq_stop,
2465	.show	=	igmp_mc_seq_show,
2466};
2467
2468static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2469{
2470	return seq_open_net(inode, file, &igmp_mc_seq_ops,
2471			sizeof(struct igmp_mc_iter_state));
2472}
2473
2474static const struct file_operations igmp_mc_seq_fops = {
2475	.owner		=	THIS_MODULE,
2476	.open		=	igmp_mc_seq_open,
2477	.read		=	seq_read,
2478	.llseek		=	seq_lseek,
2479	.release	=	seq_release_net,
2480};
2481
2482struct igmp_mcf_iter_state {
2483	struct seq_net_private p;
2484	struct net_device *dev;
2485	struct in_device *idev;
2486	struct ip_mc_list *im;
2487};
2488
2489#define igmp_mcf_seq_private(seq)	((struct igmp_mcf_iter_state *)(seq)->private)
2490
2491static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2492{
2493	struct net *net = seq_file_net(seq);
2494	struct ip_sf_list *psf = NULL;
2495	struct ip_mc_list *im = NULL;
2496	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2497
2498	state->idev = NULL;
2499	state->im = NULL;
2500	for_each_netdev_rcu(net, state->dev) {
2501		struct in_device *idev;
2502		idev = __in_dev_get_rcu(state->dev);
2503		if (unlikely(idev == NULL))
2504			continue;
2505		im = rcu_dereference(idev->mc_list);
2506		if (likely(im != NULL)) {
2507			spin_lock_bh(&im->lock);
2508			psf = im->sources;
2509			if (likely(psf != NULL)) {
2510				state->im = im;
2511				state->idev = idev;
2512				break;
2513			}
2514			spin_unlock_bh(&im->lock);
2515		}
2516	}
2517	return psf;
2518}
2519
2520static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2521{
2522	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2523
2524	psf = psf->sf_next;
2525	while (!psf) {
2526		spin_unlock_bh(&state->im->lock);
2527		state->im = state->im->next;
2528		while (!state->im) {
2529			state->dev = next_net_device_rcu(state->dev);
2530			if (!state->dev) {
2531				state->idev = NULL;
2532				goto out;
2533			}
2534			state->idev = __in_dev_get_rcu(state->dev);
2535			if (!state->idev)
2536				continue;
2537			state->im = rcu_dereference(state->idev->mc_list);
2538		}
2539		if (!state->im)
2540			break;
2541		spin_lock_bh(&state->im->lock);
2542		psf = state->im->sources;
2543	}
2544out:
2545	return psf;
2546}
2547
2548static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2549{
2550	struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2551	if (psf)
2552		while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2553			--pos;
2554	return pos ? NULL : psf;
2555}
2556
2557static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2558	__acquires(rcu)
2559{
2560	rcu_read_lock();
2561	return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2562}
2563
2564static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2565{
2566	struct ip_sf_list *psf;
2567	if (v == SEQ_START_TOKEN)
2568		psf = igmp_mcf_get_first(seq);
2569	else
2570		psf = igmp_mcf_get_next(seq, v);
2571	++*pos;
2572	return psf;
2573}
2574
2575static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2576	__releases(rcu)
2577{
2578	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2579	if (likely(state->im != NULL)) {
2580		spin_unlock_bh(&state->im->lock);
2581		state->im = NULL;
2582	}
2583	state->idev = NULL;
2584	state->dev = NULL;
2585	rcu_read_unlock();
2586}
2587
2588static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2589{
2590	struct ip_sf_list *psf = (struct ip_sf_list *)v;
2591	struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2592
2593	if (v == SEQ_START_TOKEN) {
2594		seq_printf(seq,
2595			   "%3s %6s "
2596			   "%10s %10s %6s %6s\n", "Idx",
2597			   "Device", "MCA",
2598			   "SRC", "INC", "EXC");
2599	} else {
2600		seq_printf(seq,
2601			   "%3d %6.6s 0x%08x "
2602			   "0x%08x %6lu %6lu\n",
2603			   state->dev->ifindex, state->dev->name,
2604			   ntohl(state->im->multiaddr),
2605			   ntohl(psf->sf_inaddr),
2606			   psf->sf_count[MCAST_INCLUDE],
2607			   psf->sf_count[MCAST_EXCLUDE]);
2608	}
2609	return 0;
2610}
2611
2612static const struct seq_operations igmp_mcf_seq_ops = {
2613	.start	=	igmp_mcf_seq_start,
2614	.next	=	igmp_mcf_seq_next,
2615	.stop	=	igmp_mcf_seq_stop,
2616	.show	=	igmp_mcf_seq_show,
2617};
2618
2619static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2620{
2621	return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2622			sizeof(struct igmp_mcf_iter_state));
2623}
2624
2625static const struct file_operations igmp_mcf_seq_fops = {
2626	.owner		=	THIS_MODULE,
2627	.open		=	igmp_mcf_seq_open,
2628	.read		=	seq_read,
2629	.llseek		=	seq_lseek,
2630	.release	=	seq_release_net,
2631};
2632
2633static int __net_init igmp_net_init(struct net *net)
2634{
2635	struct proc_dir_entry *pde;
 
2636
2637	pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
 
2638	if (!pde)
2639		goto out_igmp;
2640	pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
 
2641	if (!pde)
2642		goto out_mcfilter;
 
 
 
 
 
 
 
 
2643	return 0;
2644
 
 
2645out_mcfilter:
2646	proc_net_remove(net, "igmp");
2647out_igmp:
2648	return -ENOMEM;
2649}
2650
2651static void __net_exit igmp_net_exit(struct net *net)
2652{
2653	proc_net_remove(net, "mcfilter");
2654	proc_net_remove(net, "igmp");
 
2655}
2656
2657static struct pernet_operations igmp_net_ops = {
2658	.init = igmp_net_init,
2659	.exit = igmp_net_exit,
2660};
 
2661
2662int __init igmp_mc_proc_init(void)
 
2663{
2664	return register_pernet_subsys(&igmp_net_ops);
 
 
 
 
 
 
 
 
 
 
 
 
2665}
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2666#endif