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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Linux NET3: Internet Group Management Protocol [IGMP]
4 *
5 * This code implements the IGMP protocol as defined in RFC1112. There has
6 * been a further revision of this protocol since which is now supported.
7 *
8 * If you have trouble with this module be careful what gcc you have used,
9 * the older version didn't come out right using gcc 2.5.8, the newer one
10 * seems to fall out with gcc 2.6.2.
11 *
12 * Authors:
13 * Alan Cox <alan@lxorguk.ukuu.org.uk>
14 *
15 * Fixes:
16 *
17 * Alan Cox : Added lots of __inline__ to optimise
18 * the memory usage of all the tiny little
19 * functions.
20 * Alan Cox : Dumped the header building experiment.
21 * Alan Cox : Minor tweaks ready for multicast routing
22 * and extended IGMP protocol.
23 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
24 * writes utterly bogus code otherwise (sigh)
25 * fixed IGMP loopback to behave in the manner
26 * desired by mrouted, fixed the fact it has been
27 * broken since 1.3.6 and cleaned up a few minor
28 * points.
29 *
30 * Chih-Jen Chang : Tried to revise IGMP to Version 2
31 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
32 * The enhancements are mainly based on Steve Deering's
33 * ipmulti-3.5 source code.
34 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
35 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
36 * the mrouted version on that device.
37 * Chih-Jen Chang : Added the max_resp_time parameter to
38 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
39 * to identify the multicast router version
40 * and do what the IGMP version 2 specified.
41 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
42 * Tsu-Sheng Tsao if the specified time expired.
43 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
44 * Alan Cox : Use GFP_ATOMIC in the right places.
45 * Christian Daudt : igmp timer wasn't set for local group
46 * memberships but was being deleted,
47 * which caused a "del_timer() called
48 * from %p with timer not initialized\n"
49 * message (960131).
50 * Christian Daudt : removed del_timer from
51 * igmp_timer_expire function (960205).
52 * Christian Daudt : igmp_heard_report now only calls
53 * igmp_timer_expire if tm->running is
54 * true (960216).
55 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
56 * igmp_heard_query never trigger. Expiry
57 * miscalculation fixed in igmp_heard_query
58 * and random() made to return unsigned to
59 * prevent negative expiry times.
60 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
61 * fix from pending 2.1.x patches.
62 * Alan Cox: Forget to enable FDDI support earlier.
63 * Alexey Kuznetsov: Fixed leaving groups on device down.
64 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
65 * David L Stevens: IGMPv3 support, with help from
66 * Vinay Kulkarni
67 */
68
69#include <linux/module.h>
70#include <linux/slab.h>
71#include <linux/uaccess.h>
72#include <linux/types.h>
73#include <linux/kernel.h>
74#include <linux/jiffies.h>
75#include <linux/string.h>
76#include <linux/socket.h>
77#include <linux/sockios.h>
78#include <linux/in.h>
79#include <linux/inet.h>
80#include <linux/netdevice.h>
81#include <linux/skbuff.h>
82#include <linux/inetdevice.h>
83#include <linux/igmp.h>
84#include <linux/if_arp.h>
85#include <linux/rtnetlink.h>
86#include <linux/times.h>
87#include <linux/pkt_sched.h>
88#include <linux/byteorder/generic.h>
89
90#include <net/net_namespace.h>
91#include <net/arp.h>
92#include <net/ip.h>
93#include <net/protocol.h>
94#include <net/route.h>
95#include <net/sock.h>
96#include <net/checksum.h>
97#include <net/inet_common.h>
98#include <linux/netfilter_ipv4.h>
99#ifdef CONFIG_IP_MROUTE
100#include <linux/mroute.h>
101#endif
102#ifdef CONFIG_PROC_FS
103#include <linux/proc_fs.h>
104#include <linux/seq_file.h>
105#endif
106
107#ifdef CONFIG_IP_MULTICAST
108/* Parameter names and values are taken from igmp-v2-06 draft */
109
110#define IGMP_QUERY_INTERVAL (125*HZ)
111#define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
112
113#define IGMP_INITIAL_REPORT_DELAY (1)
114
115/* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
116 * IGMP specs require to report membership immediately after
117 * joining a group, but we delay the first report by a
118 * small interval. It seems more natural and still does not
119 * contradict to specs provided this delay is small enough.
120 */
121
122#define IGMP_V1_SEEN(in_dev) \
123 (IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
124 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
125 ((in_dev)->mr_v1_seen && \
126 time_before(jiffies, (in_dev)->mr_v1_seen)))
127#define IGMP_V2_SEEN(in_dev) \
128 (IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
129 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
130 ((in_dev)->mr_v2_seen && \
131 time_before(jiffies, (in_dev)->mr_v2_seen)))
132
133static int unsolicited_report_interval(struct in_device *in_dev)
134{
135 int interval_ms, interval_jiffies;
136
137 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
138 interval_ms = IN_DEV_CONF_GET(
139 in_dev,
140 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
141 else /* v3 */
142 interval_ms = IN_DEV_CONF_GET(
143 in_dev,
144 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
145
146 interval_jiffies = msecs_to_jiffies(interval_ms);
147
148 /* _timer functions can't handle a delay of 0 jiffies so ensure
149 * we always return a positive value.
150 */
151 if (interval_jiffies <= 0)
152 interval_jiffies = 1;
153 return interval_jiffies;
154}
155
156static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
157 gfp_t gfp);
158static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
159static void igmpv3_clear_delrec(struct in_device *in_dev);
160static int sf_setstate(struct ip_mc_list *pmc);
161static void sf_markstate(struct ip_mc_list *pmc);
162#endif
163static void ip_mc_clear_src(struct ip_mc_list *pmc);
164static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
165 int sfcount, __be32 *psfsrc, int delta);
166
167static void ip_ma_put(struct ip_mc_list *im)
168{
169 if (refcount_dec_and_test(&im->refcnt)) {
170 in_dev_put(im->interface);
171 kfree_rcu(im, rcu);
172 }
173}
174
175#define for_each_pmc_rcu(in_dev, pmc) \
176 for (pmc = rcu_dereference(in_dev->mc_list); \
177 pmc != NULL; \
178 pmc = rcu_dereference(pmc->next_rcu))
179
180#define for_each_pmc_rtnl(in_dev, pmc) \
181 for (pmc = rtnl_dereference(in_dev->mc_list); \
182 pmc != NULL; \
183 pmc = rtnl_dereference(pmc->next_rcu))
184
185static void ip_sf_list_clear_all(struct ip_sf_list *psf)
186{
187 struct ip_sf_list *next;
188
189 while (psf) {
190 next = psf->sf_next;
191 kfree(psf);
192 psf = next;
193 }
194}
195
196#ifdef CONFIG_IP_MULTICAST
197
198/*
199 * Timer management
200 */
201
202static void igmp_stop_timer(struct ip_mc_list *im)
203{
204 spin_lock_bh(&im->lock);
205 if (del_timer(&im->timer))
206 refcount_dec(&im->refcnt);
207 im->tm_running = 0;
208 im->reporter = 0;
209 im->unsolicit_count = 0;
210 spin_unlock_bh(&im->lock);
211}
212
213/* It must be called with locked im->lock */
214static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
215{
216 int tv = get_random_u32_below(max_delay);
217
218 im->tm_running = 1;
219 if (refcount_inc_not_zero(&im->refcnt)) {
220 if (mod_timer(&im->timer, jiffies + tv + 2))
221 ip_ma_put(im);
222 }
223}
224
225static void igmp_gq_start_timer(struct in_device *in_dev)
226{
227 int tv = get_random_u32_below(in_dev->mr_maxdelay);
228 unsigned long exp = jiffies + tv + 2;
229
230 if (in_dev->mr_gq_running &&
231 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
232 return;
233
234 in_dev->mr_gq_running = 1;
235 if (!mod_timer(&in_dev->mr_gq_timer, exp))
236 in_dev_hold(in_dev);
237}
238
239static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
240{
241 int tv = get_random_u32_below(delay);
242
243 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
244 in_dev_hold(in_dev);
245}
246
247static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
248{
249 spin_lock_bh(&im->lock);
250 im->unsolicit_count = 0;
251 if (del_timer(&im->timer)) {
252 if ((long)(im->timer.expires-jiffies) < max_delay) {
253 add_timer(&im->timer);
254 im->tm_running = 1;
255 spin_unlock_bh(&im->lock);
256 return;
257 }
258 refcount_dec(&im->refcnt);
259 }
260 igmp_start_timer(im, max_delay);
261 spin_unlock_bh(&im->lock);
262}
263
264
265/*
266 * Send an IGMP report.
267 */
268
269#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
270
271
272static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
273 int gdeleted, int sdeleted)
274{
275 switch (type) {
276 case IGMPV3_MODE_IS_INCLUDE:
277 case IGMPV3_MODE_IS_EXCLUDE:
278 if (gdeleted || sdeleted)
279 return 0;
280 if (!(pmc->gsquery && !psf->sf_gsresp)) {
281 if (pmc->sfmode == MCAST_INCLUDE)
282 return 1;
283 /* don't include if this source is excluded
284 * in all filters
285 */
286 if (psf->sf_count[MCAST_INCLUDE])
287 return type == IGMPV3_MODE_IS_INCLUDE;
288 return pmc->sfcount[MCAST_EXCLUDE] ==
289 psf->sf_count[MCAST_EXCLUDE];
290 }
291 return 0;
292 case IGMPV3_CHANGE_TO_INCLUDE:
293 if (gdeleted || sdeleted)
294 return 0;
295 return psf->sf_count[MCAST_INCLUDE] != 0;
296 case IGMPV3_CHANGE_TO_EXCLUDE:
297 if (gdeleted || sdeleted)
298 return 0;
299 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
300 psf->sf_count[MCAST_INCLUDE])
301 return 0;
302 return pmc->sfcount[MCAST_EXCLUDE] ==
303 psf->sf_count[MCAST_EXCLUDE];
304 case IGMPV3_ALLOW_NEW_SOURCES:
305 if (gdeleted || !psf->sf_crcount)
306 return 0;
307 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
308 case IGMPV3_BLOCK_OLD_SOURCES:
309 if (pmc->sfmode == MCAST_INCLUDE)
310 return gdeleted || (psf->sf_crcount && sdeleted);
311 return psf->sf_crcount && !gdeleted && !sdeleted;
312 }
313 return 0;
314}
315
316static int
317igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
318{
319 struct ip_sf_list *psf;
320 int scount = 0;
321
322 for (psf = pmc->sources; psf; psf = psf->sf_next) {
323 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
324 continue;
325 scount++;
326 }
327 return scount;
328}
329
330/* source address selection per RFC 3376 section 4.2.13 */
331static __be32 igmpv3_get_srcaddr(struct net_device *dev,
332 const struct flowi4 *fl4)
333{
334 struct in_device *in_dev = __in_dev_get_rcu(dev);
335 const struct in_ifaddr *ifa;
336
337 if (!in_dev)
338 return htonl(INADDR_ANY);
339
340 in_dev_for_each_ifa_rcu(ifa, in_dev) {
341 if (fl4->saddr == ifa->ifa_local)
342 return fl4->saddr;
343 }
344
345 return htonl(INADDR_ANY);
346}
347
348static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
349{
350 struct sk_buff *skb;
351 struct rtable *rt;
352 struct iphdr *pip;
353 struct igmpv3_report *pig;
354 struct net *net = dev_net(dev);
355 struct flowi4 fl4;
356 int hlen = LL_RESERVED_SPACE(dev);
357 int tlen = dev->needed_tailroom;
358 unsigned int size;
359
360 size = min(mtu, IP_MAX_MTU);
361 while (1) {
362 skb = alloc_skb(size + hlen + tlen,
363 GFP_ATOMIC | __GFP_NOWARN);
364 if (skb)
365 break;
366 size >>= 1;
367 if (size < 256)
368 return NULL;
369 }
370 skb->priority = TC_PRIO_CONTROL;
371
372 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
373 0, 0,
374 IPPROTO_IGMP, 0, dev->ifindex);
375 if (IS_ERR(rt)) {
376 kfree_skb(skb);
377 return NULL;
378 }
379
380 skb_dst_set(skb, &rt->dst);
381 skb->dev = dev;
382
383 skb_reserve(skb, hlen);
384 skb_tailroom_reserve(skb, mtu, tlen);
385
386 skb_reset_network_header(skb);
387 pip = ip_hdr(skb);
388 skb_put(skb, sizeof(struct iphdr) + 4);
389
390 pip->version = 4;
391 pip->ihl = (sizeof(struct iphdr)+4)>>2;
392 pip->tos = 0xc0;
393 pip->frag_off = htons(IP_DF);
394 pip->ttl = 1;
395 pip->daddr = fl4.daddr;
396
397 rcu_read_lock();
398 pip->saddr = igmpv3_get_srcaddr(dev, &fl4);
399 rcu_read_unlock();
400
401 pip->protocol = IPPROTO_IGMP;
402 pip->tot_len = 0; /* filled in later */
403 ip_select_ident(net, skb, NULL);
404 ((u8 *)&pip[1])[0] = IPOPT_RA;
405 ((u8 *)&pip[1])[1] = 4;
406 ((u8 *)&pip[1])[2] = 0;
407 ((u8 *)&pip[1])[3] = 0;
408
409 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
410 skb_put(skb, sizeof(*pig));
411 pig = igmpv3_report_hdr(skb);
412 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
413 pig->resv1 = 0;
414 pig->csum = 0;
415 pig->resv2 = 0;
416 pig->ngrec = 0;
417 return skb;
418}
419
420static int igmpv3_sendpack(struct sk_buff *skb)
421{
422 struct igmphdr *pig = igmp_hdr(skb);
423 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
424
425 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
426
427 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
428}
429
430static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
431{
432 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
433}
434
435static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
436 int type, struct igmpv3_grec **ppgr, unsigned int mtu)
437{
438 struct net_device *dev = pmc->interface->dev;
439 struct igmpv3_report *pih;
440 struct igmpv3_grec *pgr;
441
442 if (!skb) {
443 skb = igmpv3_newpack(dev, mtu);
444 if (!skb)
445 return NULL;
446 }
447 pgr = skb_put(skb, sizeof(struct igmpv3_grec));
448 pgr->grec_type = type;
449 pgr->grec_auxwords = 0;
450 pgr->grec_nsrcs = 0;
451 pgr->grec_mca = pmc->multiaddr;
452 pih = igmpv3_report_hdr(skb);
453 pih->ngrec = htons(ntohs(pih->ngrec)+1);
454 *ppgr = pgr;
455 return skb;
456}
457
458#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
459
460static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
461 int type, int gdeleted, int sdeleted)
462{
463 struct net_device *dev = pmc->interface->dev;
464 struct net *net = dev_net(dev);
465 struct igmpv3_report *pih;
466 struct igmpv3_grec *pgr = NULL;
467 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
468 int scount, stotal, first, isquery, truncate;
469 unsigned int mtu;
470
471 if (pmc->multiaddr == IGMP_ALL_HOSTS)
472 return skb;
473 if (ipv4_is_local_multicast(pmc->multiaddr) &&
474 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
475 return skb;
476
477 mtu = READ_ONCE(dev->mtu);
478 if (mtu < IPV4_MIN_MTU)
479 return skb;
480
481 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
482 type == IGMPV3_MODE_IS_EXCLUDE;
483 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
484 type == IGMPV3_CHANGE_TO_EXCLUDE;
485
486 stotal = scount = 0;
487
488 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
489
490 if (!*psf_list)
491 goto empty_source;
492
493 pih = skb ? igmpv3_report_hdr(skb) : NULL;
494
495 /* EX and TO_EX get a fresh packet, if needed */
496 if (truncate) {
497 if (pih && pih->ngrec &&
498 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
499 if (skb)
500 igmpv3_sendpack(skb);
501 skb = igmpv3_newpack(dev, mtu);
502 }
503 }
504 first = 1;
505 psf_prev = NULL;
506 for (psf = *psf_list; psf; psf = psf_next) {
507 __be32 *psrc;
508
509 psf_next = psf->sf_next;
510
511 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
512 psf_prev = psf;
513 continue;
514 }
515
516 /* Based on RFC3376 5.1. Should not send source-list change
517 * records when there is a filter mode change.
518 */
519 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
520 (!gdeleted && pmc->crcount)) &&
521 (type == IGMPV3_ALLOW_NEW_SOURCES ||
522 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
523 goto decrease_sf_crcount;
524
525 /* clear marks on query responses */
526 if (isquery)
527 psf->sf_gsresp = 0;
528
529 if (AVAILABLE(skb) < sizeof(__be32) +
530 first*sizeof(struct igmpv3_grec)) {
531 if (truncate && !first)
532 break; /* truncate these */
533 if (pgr)
534 pgr->grec_nsrcs = htons(scount);
535 if (skb)
536 igmpv3_sendpack(skb);
537 skb = igmpv3_newpack(dev, mtu);
538 first = 1;
539 scount = 0;
540 }
541 if (first) {
542 skb = add_grhead(skb, pmc, type, &pgr, mtu);
543 first = 0;
544 }
545 if (!skb)
546 return NULL;
547 psrc = skb_put(skb, sizeof(__be32));
548 *psrc = psf->sf_inaddr;
549 scount++; stotal++;
550 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
551 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
552decrease_sf_crcount:
553 psf->sf_crcount--;
554 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
555 if (psf_prev)
556 psf_prev->sf_next = psf->sf_next;
557 else
558 *psf_list = psf->sf_next;
559 kfree(psf);
560 continue;
561 }
562 }
563 psf_prev = psf;
564 }
565
566empty_source:
567 if (!stotal) {
568 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
569 type == IGMPV3_BLOCK_OLD_SOURCES)
570 return skb;
571 if (pmc->crcount || isquery) {
572 /* make sure we have room for group header */
573 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
574 igmpv3_sendpack(skb);
575 skb = NULL; /* add_grhead will get a new one */
576 }
577 skb = add_grhead(skb, pmc, type, &pgr, mtu);
578 }
579 }
580 if (pgr)
581 pgr->grec_nsrcs = htons(scount);
582
583 if (isquery)
584 pmc->gsquery = 0; /* clear query state on report */
585 return skb;
586}
587
588static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
589{
590 struct sk_buff *skb = NULL;
591 struct net *net = dev_net(in_dev->dev);
592 int type;
593
594 if (!pmc) {
595 rcu_read_lock();
596 for_each_pmc_rcu(in_dev, pmc) {
597 if (pmc->multiaddr == IGMP_ALL_HOSTS)
598 continue;
599 if (ipv4_is_local_multicast(pmc->multiaddr) &&
600 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
601 continue;
602 spin_lock_bh(&pmc->lock);
603 if (pmc->sfcount[MCAST_EXCLUDE])
604 type = IGMPV3_MODE_IS_EXCLUDE;
605 else
606 type = IGMPV3_MODE_IS_INCLUDE;
607 skb = add_grec(skb, pmc, type, 0, 0);
608 spin_unlock_bh(&pmc->lock);
609 }
610 rcu_read_unlock();
611 } else {
612 spin_lock_bh(&pmc->lock);
613 if (pmc->sfcount[MCAST_EXCLUDE])
614 type = IGMPV3_MODE_IS_EXCLUDE;
615 else
616 type = IGMPV3_MODE_IS_INCLUDE;
617 skb = add_grec(skb, pmc, type, 0, 0);
618 spin_unlock_bh(&pmc->lock);
619 }
620 if (!skb)
621 return 0;
622 return igmpv3_sendpack(skb);
623}
624
625/*
626 * remove zero-count source records from a source filter list
627 */
628static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
629{
630 struct ip_sf_list *psf_prev, *psf_next, *psf;
631
632 psf_prev = NULL;
633 for (psf = *ppsf; psf; psf = psf_next) {
634 psf_next = psf->sf_next;
635 if (psf->sf_crcount == 0) {
636 if (psf_prev)
637 psf_prev->sf_next = psf->sf_next;
638 else
639 *ppsf = psf->sf_next;
640 kfree(psf);
641 } else
642 psf_prev = psf;
643 }
644}
645
646static void kfree_pmc(struct ip_mc_list *pmc)
647{
648 ip_sf_list_clear_all(pmc->sources);
649 ip_sf_list_clear_all(pmc->tomb);
650 kfree(pmc);
651}
652
653static void igmpv3_send_cr(struct in_device *in_dev)
654{
655 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
656 struct sk_buff *skb = NULL;
657 int type, dtype;
658
659 rcu_read_lock();
660 spin_lock_bh(&in_dev->mc_tomb_lock);
661
662 /* deleted MCA's */
663 pmc_prev = NULL;
664 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
665 pmc_next = pmc->next;
666 if (pmc->sfmode == MCAST_INCLUDE) {
667 type = IGMPV3_BLOCK_OLD_SOURCES;
668 dtype = IGMPV3_BLOCK_OLD_SOURCES;
669 skb = add_grec(skb, pmc, type, 1, 0);
670 skb = add_grec(skb, pmc, dtype, 1, 1);
671 }
672 if (pmc->crcount) {
673 if (pmc->sfmode == MCAST_EXCLUDE) {
674 type = IGMPV3_CHANGE_TO_INCLUDE;
675 skb = add_grec(skb, pmc, type, 1, 0);
676 }
677 pmc->crcount--;
678 if (pmc->crcount == 0) {
679 igmpv3_clear_zeros(&pmc->tomb);
680 igmpv3_clear_zeros(&pmc->sources);
681 }
682 }
683 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
684 if (pmc_prev)
685 pmc_prev->next = pmc_next;
686 else
687 in_dev->mc_tomb = pmc_next;
688 in_dev_put(pmc->interface);
689 kfree_pmc(pmc);
690 } else
691 pmc_prev = pmc;
692 }
693 spin_unlock_bh(&in_dev->mc_tomb_lock);
694
695 /* change recs */
696 for_each_pmc_rcu(in_dev, pmc) {
697 spin_lock_bh(&pmc->lock);
698 if (pmc->sfcount[MCAST_EXCLUDE]) {
699 type = IGMPV3_BLOCK_OLD_SOURCES;
700 dtype = IGMPV3_ALLOW_NEW_SOURCES;
701 } else {
702 type = IGMPV3_ALLOW_NEW_SOURCES;
703 dtype = IGMPV3_BLOCK_OLD_SOURCES;
704 }
705 skb = add_grec(skb, pmc, type, 0, 0);
706 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
707
708 /* filter mode changes */
709 if (pmc->crcount) {
710 if (pmc->sfmode == MCAST_EXCLUDE)
711 type = IGMPV3_CHANGE_TO_EXCLUDE;
712 else
713 type = IGMPV3_CHANGE_TO_INCLUDE;
714 skb = add_grec(skb, pmc, type, 0, 0);
715 pmc->crcount--;
716 }
717 spin_unlock_bh(&pmc->lock);
718 }
719 rcu_read_unlock();
720
721 if (!skb)
722 return;
723 (void) igmpv3_sendpack(skb);
724}
725
726static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
727 int type)
728{
729 struct sk_buff *skb;
730 struct iphdr *iph;
731 struct igmphdr *ih;
732 struct rtable *rt;
733 struct net_device *dev = in_dev->dev;
734 struct net *net = dev_net(dev);
735 __be32 group = pmc ? pmc->multiaddr : 0;
736 struct flowi4 fl4;
737 __be32 dst;
738 int hlen, tlen;
739
740 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
741 return igmpv3_send_report(in_dev, pmc);
742
743 if (ipv4_is_local_multicast(group) &&
744 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
745 return 0;
746
747 if (type == IGMP_HOST_LEAVE_MESSAGE)
748 dst = IGMP_ALL_ROUTER;
749 else
750 dst = group;
751
752 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
753 0, 0,
754 IPPROTO_IGMP, 0, dev->ifindex);
755 if (IS_ERR(rt))
756 return -1;
757
758 hlen = LL_RESERVED_SPACE(dev);
759 tlen = dev->needed_tailroom;
760 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
761 if (!skb) {
762 ip_rt_put(rt);
763 return -1;
764 }
765 skb->priority = TC_PRIO_CONTROL;
766
767 skb_dst_set(skb, &rt->dst);
768
769 skb_reserve(skb, hlen);
770
771 skb_reset_network_header(skb);
772 iph = ip_hdr(skb);
773 skb_put(skb, sizeof(struct iphdr) + 4);
774
775 iph->version = 4;
776 iph->ihl = (sizeof(struct iphdr)+4)>>2;
777 iph->tos = 0xc0;
778 iph->frag_off = htons(IP_DF);
779 iph->ttl = 1;
780 iph->daddr = dst;
781 iph->saddr = fl4.saddr;
782 iph->protocol = IPPROTO_IGMP;
783 ip_select_ident(net, skb, NULL);
784 ((u8 *)&iph[1])[0] = IPOPT_RA;
785 ((u8 *)&iph[1])[1] = 4;
786 ((u8 *)&iph[1])[2] = 0;
787 ((u8 *)&iph[1])[3] = 0;
788
789 ih = skb_put(skb, sizeof(struct igmphdr));
790 ih->type = type;
791 ih->code = 0;
792 ih->csum = 0;
793 ih->group = group;
794 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
795
796 return ip_local_out(net, skb->sk, skb);
797}
798
799static void igmp_gq_timer_expire(struct timer_list *t)
800{
801 struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer);
802
803 in_dev->mr_gq_running = 0;
804 igmpv3_send_report(in_dev, NULL);
805 in_dev_put(in_dev);
806}
807
808static void igmp_ifc_timer_expire(struct timer_list *t)
809{
810 struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer);
811 u32 mr_ifc_count;
812
813 igmpv3_send_cr(in_dev);
814restart:
815 mr_ifc_count = READ_ONCE(in_dev->mr_ifc_count);
816
817 if (mr_ifc_count) {
818 if (cmpxchg(&in_dev->mr_ifc_count,
819 mr_ifc_count,
820 mr_ifc_count - 1) != mr_ifc_count)
821 goto restart;
822 igmp_ifc_start_timer(in_dev,
823 unsolicited_report_interval(in_dev));
824 }
825 in_dev_put(in_dev);
826}
827
828static void igmp_ifc_event(struct in_device *in_dev)
829{
830 struct net *net = dev_net(in_dev->dev);
831 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
832 return;
833 WRITE_ONCE(in_dev->mr_ifc_count, in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv));
834 igmp_ifc_start_timer(in_dev, 1);
835}
836
837
838static void igmp_timer_expire(struct timer_list *t)
839{
840 struct ip_mc_list *im = from_timer(im, t, timer);
841 struct in_device *in_dev = im->interface;
842
843 spin_lock(&im->lock);
844 im->tm_running = 0;
845
846 if (im->unsolicit_count && --im->unsolicit_count)
847 igmp_start_timer(im, unsolicited_report_interval(in_dev));
848
849 im->reporter = 1;
850 spin_unlock(&im->lock);
851
852 if (IGMP_V1_SEEN(in_dev))
853 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
854 else if (IGMP_V2_SEEN(in_dev))
855 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
856 else
857 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
858
859 ip_ma_put(im);
860}
861
862/* mark EXCLUDE-mode sources */
863static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
864{
865 struct ip_sf_list *psf;
866 int i, scount;
867
868 scount = 0;
869 for (psf = pmc->sources; psf; psf = psf->sf_next) {
870 if (scount == nsrcs)
871 break;
872 for (i = 0; i < nsrcs; i++) {
873 /* skip inactive filters */
874 if (psf->sf_count[MCAST_INCLUDE] ||
875 pmc->sfcount[MCAST_EXCLUDE] !=
876 psf->sf_count[MCAST_EXCLUDE])
877 break;
878 if (srcs[i] == psf->sf_inaddr) {
879 scount++;
880 break;
881 }
882 }
883 }
884 pmc->gsquery = 0;
885 if (scount == nsrcs) /* all sources excluded */
886 return 0;
887 return 1;
888}
889
890static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
891{
892 struct ip_sf_list *psf;
893 int i, scount;
894
895 if (pmc->sfmode == MCAST_EXCLUDE)
896 return igmp_xmarksources(pmc, nsrcs, srcs);
897
898 /* mark INCLUDE-mode sources */
899 scount = 0;
900 for (psf = pmc->sources; psf; psf = psf->sf_next) {
901 if (scount == nsrcs)
902 break;
903 for (i = 0; i < nsrcs; i++)
904 if (srcs[i] == psf->sf_inaddr) {
905 psf->sf_gsresp = 1;
906 scount++;
907 break;
908 }
909 }
910 if (!scount) {
911 pmc->gsquery = 0;
912 return 0;
913 }
914 pmc->gsquery = 1;
915 return 1;
916}
917
918/* return true if packet was dropped */
919static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
920{
921 struct ip_mc_list *im;
922 struct net *net = dev_net(in_dev->dev);
923
924 /* Timers are only set for non-local groups */
925
926 if (group == IGMP_ALL_HOSTS)
927 return false;
928 if (ipv4_is_local_multicast(group) &&
929 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
930 return false;
931
932 rcu_read_lock();
933 for_each_pmc_rcu(in_dev, im) {
934 if (im->multiaddr == group) {
935 igmp_stop_timer(im);
936 break;
937 }
938 }
939 rcu_read_unlock();
940 return false;
941}
942
943/* return true if packet was dropped */
944static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
945 int len)
946{
947 struct igmphdr *ih = igmp_hdr(skb);
948 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
949 struct ip_mc_list *im;
950 __be32 group = ih->group;
951 int max_delay;
952 int mark = 0;
953 struct net *net = dev_net(in_dev->dev);
954
955
956 if (len == 8) {
957 if (ih->code == 0) {
958 /* Alas, old v1 router presents here. */
959
960 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
961 in_dev->mr_v1_seen = jiffies +
962 (in_dev->mr_qrv * in_dev->mr_qi) +
963 in_dev->mr_qri;
964 group = 0;
965 } else {
966 /* v2 router present */
967 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
968 in_dev->mr_v2_seen = jiffies +
969 (in_dev->mr_qrv * in_dev->mr_qi) +
970 in_dev->mr_qri;
971 }
972 /* cancel the interface change timer */
973 WRITE_ONCE(in_dev->mr_ifc_count, 0);
974 if (del_timer(&in_dev->mr_ifc_timer))
975 __in_dev_put(in_dev);
976 /* clear deleted report items */
977 igmpv3_clear_delrec(in_dev);
978 } else if (len < 12) {
979 return true; /* ignore bogus packet; freed by caller */
980 } else if (IGMP_V1_SEEN(in_dev)) {
981 /* This is a v3 query with v1 queriers present */
982 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
983 group = 0;
984 } else if (IGMP_V2_SEEN(in_dev)) {
985 /* this is a v3 query with v2 queriers present;
986 * Interpretation of the max_delay code is problematic here.
987 * A real v2 host would use ih_code directly, while v3 has a
988 * different encoding. We use the v3 encoding as more likely
989 * to be intended in a v3 query.
990 */
991 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
992 if (!max_delay)
993 max_delay = 1; /* can't mod w/ 0 */
994 } else { /* v3 */
995 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
996 return true;
997
998 ih3 = igmpv3_query_hdr(skb);
999 if (ih3->nsrcs) {
1000 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
1001 + ntohs(ih3->nsrcs)*sizeof(__be32)))
1002 return true;
1003 ih3 = igmpv3_query_hdr(skb);
1004 }
1005
1006 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
1007 if (!max_delay)
1008 max_delay = 1; /* can't mod w/ 0 */
1009 in_dev->mr_maxdelay = max_delay;
1010
1011 /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently
1012 * received value was zero, use the default or statically
1013 * configured value.
1014 */
1015 in_dev->mr_qrv = ih3->qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1016 in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL;
1017
1018 /* RFC3376, 8.3. Query Response Interval:
1019 * The number of seconds represented by the [Query Response
1020 * Interval] must be less than the [Query Interval].
1021 */
1022 if (in_dev->mr_qri >= in_dev->mr_qi)
1023 in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ;
1024
1025 if (!group) { /* general query */
1026 if (ih3->nsrcs)
1027 return true; /* no sources allowed */
1028 igmp_gq_start_timer(in_dev);
1029 return false;
1030 }
1031 /* mark sources to include, if group & source-specific */
1032 mark = ih3->nsrcs != 0;
1033 }
1034
1035 /*
1036 * - Start the timers in all of our membership records
1037 * that the query applies to for the interface on
1038 * which the query arrived excl. those that belong
1039 * to a "local" group (224.0.0.X)
1040 * - For timers already running check if they need to
1041 * be reset.
1042 * - Use the igmp->igmp_code field as the maximum
1043 * delay possible
1044 */
1045 rcu_read_lock();
1046 for_each_pmc_rcu(in_dev, im) {
1047 int changed;
1048
1049 if (group && group != im->multiaddr)
1050 continue;
1051 if (im->multiaddr == IGMP_ALL_HOSTS)
1052 continue;
1053 if (ipv4_is_local_multicast(im->multiaddr) &&
1054 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1055 continue;
1056 spin_lock_bh(&im->lock);
1057 if (im->tm_running)
1058 im->gsquery = im->gsquery && mark;
1059 else
1060 im->gsquery = mark;
1061 changed = !im->gsquery ||
1062 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1063 spin_unlock_bh(&im->lock);
1064 if (changed)
1065 igmp_mod_timer(im, max_delay);
1066 }
1067 rcu_read_unlock();
1068 return false;
1069}
1070
1071/* called in rcu_read_lock() section */
1072int igmp_rcv(struct sk_buff *skb)
1073{
1074 /* This basically follows the spec line by line -- see RFC1112 */
1075 struct igmphdr *ih;
1076 struct net_device *dev = skb->dev;
1077 struct in_device *in_dev;
1078 int len = skb->len;
1079 bool dropped = true;
1080
1081 if (netif_is_l3_master(dev)) {
1082 dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif);
1083 if (!dev)
1084 goto drop;
1085 }
1086
1087 in_dev = __in_dev_get_rcu(dev);
1088 if (!in_dev)
1089 goto drop;
1090
1091 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1092 goto drop;
1093
1094 if (skb_checksum_simple_validate(skb))
1095 goto drop;
1096
1097 ih = igmp_hdr(skb);
1098 switch (ih->type) {
1099 case IGMP_HOST_MEMBERSHIP_QUERY:
1100 dropped = igmp_heard_query(in_dev, skb, len);
1101 break;
1102 case IGMP_HOST_MEMBERSHIP_REPORT:
1103 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1104 /* Is it our report looped back? */
1105 if (rt_is_output_route(skb_rtable(skb)))
1106 break;
1107 /* don't rely on MC router hearing unicast reports */
1108 if (skb->pkt_type == PACKET_MULTICAST ||
1109 skb->pkt_type == PACKET_BROADCAST)
1110 dropped = igmp_heard_report(in_dev, ih->group);
1111 break;
1112 case IGMP_PIM:
1113#ifdef CONFIG_IP_PIMSM_V1
1114 return pim_rcv_v1(skb);
1115#endif
1116 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1117 case IGMP_DVMRP:
1118 case IGMP_TRACE:
1119 case IGMP_HOST_LEAVE_MESSAGE:
1120 case IGMP_MTRACE:
1121 case IGMP_MTRACE_RESP:
1122 break;
1123 default:
1124 break;
1125 }
1126
1127drop:
1128 if (dropped)
1129 kfree_skb(skb);
1130 else
1131 consume_skb(skb);
1132 return 0;
1133}
1134
1135#endif
1136
1137
1138/*
1139 * Add a filter to a device
1140 */
1141
1142static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1143{
1144 char buf[MAX_ADDR_LEN];
1145 struct net_device *dev = in_dev->dev;
1146
1147 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1148 We will get multicast token leakage, when IFF_MULTICAST
1149 is changed. This check should be done in ndo_set_rx_mode
1150 routine. Something sort of:
1151 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1152 --ANK
1153 */
1154 if (arp_mc_map(addr, buf, dev, 0) == 0)
1155 dev_mc_add(dev, buf);
1156}
1157
1158/*
1159 * Remove a filter from a device
1160 */
1161
1162static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1163{
1164 char buf[MAX_ADDR_LEN];
1165 struct net_device *dev = in_dev->dev;
1166
1167 if (arp_mc_map(addr, buf, dev, 0) == 0)
1168 dev_mc_del(dev, buf);
1169}
1170
1171#ifdef CONFIG_IP_MULTICAST
1172/*
1173 * deleted ip_mc_list manipulation
1174 */
1175static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im,
1176 gfp_t gfp)
1177{
1178 struct ip_mc_list *pmc;
1179 struct net *net = dev_net(in_dev->dev);
1180
1181 /* this is an "ip_mc_list" for convenience; only the fields below
1182 * are actually used. In particular, the refcnt and users are not
1183 * used for management of the delete list. Using the same structure
1184 * for deleted items allows change reports to use common code with
1185 * non-deleted or query-response MCA's.
1186 */
1187 pmc = kzalloc(sizeof(*pmc), gfp);
1188 if (!pmc)
1189 return;
1190 spin_lock_init(&pmc->lock);
1191 spin_lock_bh(&im->lock);
1192 pmc->interface = im->interface;
1193 in_dev_hold(in_dev);
1194 pmc->multiaddr = im->multiaddr;
1195 pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1196 pmc->sfmode = im->sfmode;
1197 if (pmc->sfmode == MCAST_INCLUDE) {
1198 struct ip_sf_list *psf;
1199
1200 pmc->tomb = im->tomb;
1201 pmc->sources = im->sources;
1202 im->tomb = im->sources = NULL;
1203 for (psf = pmc->sources; psf; psf = psf->sf_next)
1204 psf->sf_crcount = pmc->crcount;
1205 }
1206 spin_unlock_bh(&im->lock);
1207
1208 spin_lock_bh(&in_dev->mc_tomb_lock);
1209 pmc->next = in_dev->mc_tomb;
1210 in_dev->mc_tomb = pmc;
1211 spin_unlock_bh(&in_dev->mc_tomb_lock);
1212}
1213
1214/*
1215 * restore ip_mc_list deleted records
1216 */
1217static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1218{
1219 struct ip_mc_list *pmc, *pmc_prev;
1220 struct ip_sf_list *psf;
1221 struct net *net = dev_net(in_dev->dev);
1222 __be32 multiaddr = im->multiaddr;
1223
1224 spin_lock_bh(&in_dev->mc_tomb_lock);
1225 pmc_prev = NULL;
1226 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1227 if (pmc->multiaddr == multiaddr)
1228 break;
1229 pmc_prev = pmc;
1230 }
1231 if (pmc) {
1232 if (pmc_prev)
1233 pmc_prev->next = pmc->next;
1234 else
1235 in_dev->mc_tomb = pmc->next;
1236 }
1237 spin_unlock_bh(&in_dev->mc_tomb_lock);
1238
1239 spin_lock_bh(&im->lock);
1240 if (pmc) {
1241 im->interface = pmc->interface;
1242 if (im->sfmode == MCAST_INCLUDE) {
1243 swap(im->tomb, pmc->tomb);
1244 swap(im->sources, pmc->sources);
1245 for (psf = im->sources; psf; psf = psf->sf_next)
1246 psf->sf_crcount = in_dev->mr_qrv ?:
1247 READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1248 } else {
1249 im->crcount = in_dev->mr_qrv ?:
1250 READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1251 }
1252 in_dev_put(pmc->interface);
1253 kfree_pmc(pmc);
1254 }
1255 spin_unlock_bh(&im->lock);
1256}
1257
1258/*
1259 * flush ip_mc_list deleted records
1260 */
1261static void igmpv3_clear_delrec(struct in_device *in_dev)
1262{
1263 struct ip_mc_list *pmc, *nextpmc;
1264
1265 spin_lock_bh(&in_dev->mc_tomb_lock);
1266 pmc = in_dev->mc_tomb;
1267 in_dev->mc_tomb = NULL;
1268 spin_unlock_bh(&in_dev->mc_tomb_lock);
1269
1270 for (; pmc; pmc = nextpmc) {
1271 nextpmc = pmc->next;
1272 ip_mc_clear_src(pmc);
1273 in_dev_put(pmc->interface);
1274 kfree_pmc(pmc);
1275 }
1276 /* clear dead sources, too */
1277 rcu_read_lock();
1278 for_each_pmc_rcu(in_dev, pmc) {
1279 struct ip_sf_list *psf;
1280
1281 spin_lock_bh(&pmc->lock);
1282 psf = pmc->tomb;
1283 pmc->tomb = NULL;
1284 spin_unlock_bh(&pmc->lock);
1285 ip_sf_list_clear_all(psf);
1286 }
1287 rcu_read_unlock();
1288}
1289#endif
1290
1291static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp)
1292{
1293 struct in_device *in_dev = im->interface;
1294#ifdef CONFIG_IP_MULTICAST
1295 struct net *net = dev_net(in_dev->dev);
1296 int reporter;
1297#endif
1298
1299 if (im->loaded) {
1300 im->loaded = 0;
1301 ip_mc_filter_del(in_dev, im->multiaddr);
1302 }
1303
1304#ifdef CONFIG_IP_MULTICAST
1305 if (im->multiaddr == IGMP_ALL_HOSTS)
1306 return;
1307 if (ipv4_is_local_multicast(im->multiaddr) &&
1308 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1309 return;
1310
1311 reporter = im->reporter;
1312 igmp_stop_timer(im);
1313
1314 if (!in_dev->dead) {
1315 if (IGMP_V1_SEEN(in_dev))
1316 return;
1317 if (IGMP_V2_SEEN(in_dev)) {
1318 if (reporter)
1319 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1320 return;
1321 }
1322 /* IGMPv3 */
1323 igmpv3_add_delrec(in_dev, im, gfp);
1324
1325 igmp_ifc_event(in_dev);
1326 }
1327#endif
1328}
1329
1330static void igmp_group_dropped(struct ip_mc_list *im)
1331{
1332 __igmp_group_dropped(im, GFP_KERNEL);
1333}
1334
1335static void igmp_group_added(struct ip_mc_list *im)
1336{
1337 struct in_device *in_dev = im->interface;
1338#ifdef CONFIG_IP_MULTICAST
1339 struct net *net = dev_net(in_dev->dev);
1340#endif
1341
1342 if (im->loaded == 0) {
1343 im->loaded = 1;
1344 ip_mc_filter_add(in_dev, im->multiaddr);
1345 }
1346
1347#ifdef CONFIG_IP_MULTICAST
1348 if (im->multiaddr == IGMP_ALL_HOSTS)
1349 return;
1350 if (ipv4_is_local_multicast(im->multiaddr) &&
1351 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1352 return;
1353
1354 if (in_dev->dead)
1355 return;
1356
1357 im->unsolicit_count = READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1358 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1359 spin_lock_bh(&im->lock);
1360 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1361 spin_unlock_bh(&im->lock);
1362 return;
1363 }
1364 /* else, v3 */
1365
1366 /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should
1367 * not send filter-mode change record as the mode should be from
1368 * IN() to IN(A).
1369 */
1370 if (im->sfmode == MCAST_EXCLUDE)
1371 im->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1372
1373 igmp_ifc_event(in_dev);
1374#endif
1375}
1376
1377
1378/*
1379 * Multicast list managers
1380 */
1381
1382static u32 ip_mc_hash(const struct ip_mc_list *im)
1383{
1384 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1385}
1386
1387static void ip_mc_hash_add(struct in_device *in_dev,
1388 struct ip_mc_list *im)
1389{
1390 struct ip_mc_list __rcu **mc_hash;
1391 u32 hash;
1392
1393 mc_hash = rtnl_dereference(in_dev->mc_hash);
1394 if (mc_hash) {
1395 hash = ip_mc_hash(im);
1396 im->next_hash = mc_hash[hash];
1397 rcu_assign_pointer(mc_hash[hash], im);
1398 return;
1399 }
1400
1401 /* do not use a hash table for small number of items */
1402 if (in_dev->mc_count < 4)
1403 return;
1404
1405 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1406 GFP_KERNEL);
1407 if (!mc_hash)
1408 return;
1409
1410 for_each_pmc_rtnl(in_dev, im) {
1411 hash = ip_mc_hash(im);
1412 im->next_hash = mc_hash[hash];
1413 RCU_INIT_POINTER(mc_hash[hash], im);
1414 }
1415
1416 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1417}
1418
1419static void ip_mc_hash_remove(struct in_device *in_dev,
1420 struct ip_mc_list *im)
1421{
1422 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1423 struct ip_mc_list *aux;
1424
1425 if (!mc_hash)
1426 return;
1427 mc_hash += ip_mc_hash(im);
1428 while ((aux = rtnl_dereference(*mc_hash)) != im)
1429 mc_hash = &aux->next_hash;
1430 *mc_hash = im->next_hash;
1431}
1432
1433
1434/*
1435 * A socket has joined a multicast group on device dev.
1436 */
1437static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr,
1438 unsigned int mode, gfp_t gfp)
1439{
1440 struct ip_mc_list __rcu **mc_hash;
1441 struct ip_mc_list *im;
1442
1443 ASSERT_RTNL();
1444
1445 mc_hash = rtnl_dereference(in_dev->mc_hash);
1446 if (mc_hash) {
1447 u32 hash = hash_32((__force u32)addr, MC_HASH_SZ_LOG);
1448
1449 for (im = rtnl_dereference(mc_hash[hash]);
1450 im;
1451 im = rtnl_dereference(im->next_hash)) {
1452 if (im->multiaddr == addr)
1453 break;
1454 }
1455 } else {
1456 for_each_pmc_rtnl(in_dev, im) {
1457 if (im->multiaddr == addr)
1458 break;
1459 }
1460 }
1461
1462 if (im) {
1463 im->users++;
1464 ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0);
1465 goto out;
1466 }
1467
1468 im = kzalloc(sizeof(*im), gfp);
1469 if (!im)
1470 goto out;
1471
1472 im->users = 1;
1473 im->interface = in_dev;
1474 in_dev_hold(in_dev);
1475 im->multiaddr = addr;
1476 /* initial mode is (EX, empty) */
1477 im->sfmode = mode;
1478 im->sfcount[mode] = 1;
1479 refcount_set(&im->refcnt, 1);
1480 spin_lock_init(&im->lock);
1481#ifdef CONFIG_IP_MULTICAST
1482 timer_setup(&im->timer, igmp_timer_expire, 0);
1483#endif
1484
1485 im->next_rcu = in_dev->mc_list;
1486 in_dev->mc_count++;
1487 rcu_assign_pointer(in_dev->mc_list, im);
1488
1489 ip_mc_hash_add(in_dev, im);
1490
1491#ifdef CONFIG_IP_MULTICAST
1492 igmpv3_del_delrec(in_dev, im);
1493#endif
1494 igmp_group_added(im);
1495 if (!in_dev->dead)
1496 ip_rt_multicast_event(in_dev);
1497out:
1498 return;
1499}
1500
1501void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
1502{
1503 ____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp);
1504}
1505EXPORT_SYMBOL(__ip_mc_inc_group);
1506
1507void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1508{
1509 __ip_mc_inc_group(in_dev, addr, GFP_KERNEL);
1510}
1511EXPORT_SYMBOL(ip_mc_inc_group);
1512
1513static int ip_mc_check_iphdr(struct sk_buff *skb)
1514{
1515 const struct iphdr *iph;
1516 unsigned int len;
1517 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1518
1519 if (!pskb_may_pull(skb, offset))
1520 return -EINVAL;
1521
1522 iph = ip_hdr(skb);
1523
1524 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1525 return -EINVAL;
1526
1527 offset += ip_hdrlen(skb) - sizeof(*iph);
1528
1529 if (!pskb_may_pull(skb, offset))
1530 return -EINVAL;
1531
1532 iph = ip_hdr(skb);
1533
1534 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1535 return -EINVAL;
1536
1537 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1538 if (skb->len < len || len < offset)
1539 return -EINVAL;
1540
1541 skb_set_transport_header(skb, offset);
1542
1543 return 0;
1544}
1545
1546static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1547{
1548 unsigned int len = skb_transport_offset(skb);
1549
1550 len += sizeof(struct igmpv3_report);
1551
1552 return ip_mc_may_pull(skb, len) ? 0 : -EINVAL;
1553}
1554
1555static int ip_mc_check_igmp_query(struct sk_buff *skb)
1556{
1557 unsigned int transport_len = ip_transport_len(skb);
1558 unsigned int len;
1559
1560 /* IGMPv{1,2}? */
1561 if (transport_len != sizeof(struct igmphdr)) {
1562 /* or IGMPv3? */
1563 if (transport_len < sizeof(struct igmpv3_query))
1564 return -EINVAL;
1565
1566 len = skb_transport_offset(skb) + sizeof(struct igmpv3_query);
1567 if (!ip_mc_may_pull(skb, len))
1568 return -EINVAL;
1569 }
1570
1571 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1572 * all-systems destination addresses (224.0.0.1) for general queries
1573 */
1574 if (!igmp_hdr(skb)->group &&
1575 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1576 return -EINVAL;
1577
1578 return 0;
1579}
1580
1581static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1582{
1583 switch (igmp_hdr(skb)->type) {
1584 case IGMP_HOST_LEAVE_MESSAGE:
1585 case IGMP_HOST_MEMBERSHIP_REPORT:
1586 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1587 return 0;
1588 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1589 return ip_mc_check_igmp_reportv3(skb);
1590 case IGMP_HOST_MEMBERSHIP_QUERY:
1591 return ip_mc_check_igmp_query(skb);
1592 default:
1593 return -ENOMSG;
1594 }
1595}
1596
1597static __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1598{
1599 return skb_checksum_simple_validate(skb);
1600}
1601
1602static int ip_mc_check_igmp_csum(struct sk_buff *skb)
1603{
1604 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1605 unsigned int transport_len = ip_transport_len(skb);
1606 struct sk_buff *skb_chk;
1607
1608 if (!ip_mc_may_pull(skb, len))
1609 return -EINVAL;
1610
1611 skb_chk = skb_checksum_trimmed(skb, transport_len,
1612 ip_mc_validate_checksum);
1613 if (!skb_chk)
1614 return -EINVAL;
1615
1616 if (skb_chk != skb)
1617 kfree_skb(skb_chk);
1618
1619 return 0;
1620}
1621
1622/**
1623 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1624 * @skb: the skb to validate
1625 *
1626 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1627 * skb transport header accordingly and returns zero.
1628 *
1629 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1630 * standard
1631 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1632 * -ENOMEM: A memory allocation failure happened.
1633 *
1634 * Caller needs to set the skb network header and free any returned skb if it
1635 * differs from the provided skb.
1636 */
1637int ip_mc_check_igmp(struct sk_buff *skb)
1638{
1639 int ret = ip_mc_check_iphdr(skb);
1640
1641 if (ret < 0)
1642 return ret;
1643
1644 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1645 return -ENOMSG;
1646
1647 ret = ip_mc_check_igmp_csum(skb);
1648 if (ret < 0)
1649 return ret;
1650
1651 return ip_mc_check_igmp_msg(skb);
1652}
1653EXPORT_SYMBOL(ip_mc_check_igmp);
1654
1655/*
1656 * Resend IGMP JOIN report; used by netdev notifier.
1657 */
1658static void ip_mc_rejoin_groups(struct in_device *in_dev)
1659{
1660#ifdef CONFIG_IP_MULTICAST
1661 struct ip_mc_list *im;
1662 int type;
1663 struct net *net = dev_net(in_dev->dev);
1664
1665 ASSERT_RTNL();
1666
1667 for_each_pmc_rtnl(in_dev, im) {
1668 if (im->multiaddr == IGMP_ALL_HOSTS)
1669 continue;
1670 if (ipv4_is_local_multicast(im->multiaddr) &&
1671 !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports))
1672 continue;
1673
1674 /* a failover is happening and switches
1675 * must be notified immediately
1676 */
1677 if (IGMP_V1_SEEN(in_dev))
1678 type = IGMP_HOST_MEMBERSHIP_REPORT;
1679 else if (IGMP_V2_SEEN(in_dev))
1680 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1681 else
1682 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1683 igmp_send_report(in_dev, im, type);
1684 }
1685#endif
1686}
1687
1688/*
1689 * A socket has left a multicast group on device dev
1690 */
1691
1692void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp)
1693{
1694 struct ip_mc_list *i;
1695 struct ip_mc_list __rcu **ip;
1696
1697 ASSERT_RTNL();
1698
1699 for (ip = &in_dev->mc_list;
1700 (i = rtnl_dereference(*ip)) != NULL;
1701 ip = &i->next_rcu) {
1702 if (i->multiaddr == addr) {
1703 if (--i->users == 0) {
1704 ip_mc_hash_remove(in_dev, i);
1705 *ip = i->next_rcu;
1706 in_dev->mc_count--;
1707 __igmp_group_dropped(i, gfp);
1708 ip_mc_clear_src(i);
1709
1710 if (!in_dev->dead)
1711 ip_rt_multicast_event(in_dev);
1712
1713 ip_ma_put(i);
1714 return;
1715 }
1716 break;
1717 }
1718 }
1719}
1720EXPORT_SYMBOL(__ip_mc_dec_group);
1721
1722/* Device changing type */
1723
1724void ip_mc_unmap(struct in_device *in_dev)
1725{
1726 struct ip_mc_list *pmc;
1727
1728 ASSERT_RTNL();
1729
1730 for_each_pmc_rtnl(in_dev, pmc)
1731 igmp_group_dropped(pmc);
1732}
1733
1734void ip_mc_remap(struct in_device *in_dev)
1735{
1736 struct ip_mc_list *pmc;
1737
1738 ASSERT_RTNL();
1739
1740 for_each_pmc_rtnl(in_dev, pmc) {
1741#ifdef CONFIG_IP_MULTICAST
1742 igmpv3_del_delrec(in_dev, pmc);
1743#endif
1744 igmp_group_added(pmc);
1745 }
1746}
1747
1748/* Device going down */
1749
1750void ip_mc_down(struct in_device *in_dev)
1751{
1752 struct ip_mc_list *pmc;
1753
1754 ASSERT_RTNL();
1755
1756 for_each_pmc_rtnl(in_dev, pmc)
1757 igmp_group_dropped(pmc);
1758
1759#ifdef CONFIG_IP_MULTICAST
1760 WRITE_ONCE(in_dev->mr_ifc_count, 0);
1761 if (del_timer(&in_dev->mr_ifc_timer))
1762 __in_dev_put(in_dev);
1763 in_dev->mr_gq_running = 0;
1764 if (del_timer(&in_dev->mr_gq_timer))
1765 __in_dev_put(in_dev);
1766#endif
1767
1768 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1769}
1770
1771#ifdef CONFIG_IP_MULTICAST
1772static void ip_mc_reset(struct in_device *in_dev)
1773{
1774 struct net *net = dev_net(in_dev->dev);
1775
1776 in_dev->mr_qi = IGMP_QUERY_INTERVAL;
1777 in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL;
1778 in_dev->mr_qrv = READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1779}
1780#else
1781static void ip_mc_reset(struct in_device *in_dev)
1782{
1783}
1784#endif
1785
1786void ip_mc_init_dev(struct in_device *in_dev)
1787{
1788 ASSERT_RTNL();
1789
1790#ifdef CONFIG_IP_MULTICAST
1791 timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0);
1792 timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0);
1793#endif
1794 ip_mc_reset(in_dev);
1795
1796 spin_lock_init(&in_dev->mc_tomb_lock);
1797}
1798
1799/* Device going up */
1800
1801void ip_mc_up(struct in_device *in_dev)
1802{
1803 struct ip_mc_list *pmc;
1804
1805 ASSERT_RTNL();
1806
1807 ip_mc_reset(in_dev);
1808 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1809
1810 for_each_pmc_rtnl(in_dev, pmc) {
1811#ifdef CONFIG_IP_MULTICAST
1812 igmpv3_del_delrec(in_dev, pmc);
1813#endif
1814 igmp_group_added(pmc);
1815 }
1816}
1817
1818/*
1819 * Device is about to be destroyed: clean up.
1820 */
1821
1822void ip_mc_destroy_dev(struct in_device *in_dev)
1823{
1824 struct ip_mc_list *i;
1825
1826 ASSERT_RTNL();
1827
1828 /* Deactivate timers */
1829 ip_mc_down(in_dev);
1830#ifdef CONFIG_IP_MULTICAST
1831 igmpv3_clear_delrec(in_dev);
1832#endif
1833
1834 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1835 in_dev->mc_list = i->next_rcu;
1836 in_dev->mc_count--;
1837 ip_mc_clear_src(i);
1838 ip_ma_put(i);
1839 }
1840}
1841
1842/* RTNL is locked */
1843static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1844{
1845 struct net_device *dev = NULL;
1846 struct in_device *idev = NULL;
1847
1848 if (imr->imr_ifindex) {
1849 idev = inetdev_by_index(net, imr->imr_ifindex);
1850 return idev;
1851 }
1852 if (imr->imr_address.s_addr) {
1853 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1854 if (!dev)
1855 return NULL;
1856 }
1857
1858 if (!dev) {
1859 struct rtable *rt = ip_route_output(net,
1860 imr->imr_multiaddr.s_addr,
1861 0, 0, 0,
1862 RT_SCOPE_UNIVERSE);
1863 if (!IS_ERR(rt)) {
1864 dev = rt->dst.dev;
1865 ip_rt_put(rt);
1866 }
1867 }
1868 if (dev) {
1869 imr->imr_ifindex = dev->ifindex;
1870 idev = __in_dev_get_rtnl(dev);
1871 }
1872 return idev;
1873}
1874
1875/*
1876 * Join a socket to a group
1877 */
1878
1879static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1880 __be32 *psfsrc)
1881{
1882 struct ip_sf_list *psf, *psf_prev;
1883 int rv = 0;
1884
1885 psf_prev = NULL;
1886 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1887 if (psf->sf_inaddr == *psfsrc)
1888 break;
1889 psf_prev = psf;
1890 }
1891 if (!psf || psf->sf_count[sfmode] == 0) {
1892 /* source filter not found, or count wrong => bug */
1893 return -ESRCH;
1894 }
1895 psf->sf_count[sfmode]--;
1896 if (psf->sf_count[sfmode] == 0) {
1897 ip_rt_multicast_event(pmc->interface);
1898 }
1899 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1900#ifdef CONFIG_IP_MULTICAST
1901 struct in_device *in_dev = pmc->interface;
1902 struct net *net = dev_net(in_dev->dev);
1903#endif
1904
1905 /* no more filters for this source */
1906 if (psf_prev)
1907 psf_prev->sf_next = psf->sf_next;
1908 else
1909 pmc->sources = psf->sf_next;
1910#ifdef CONFIG_IP_MULTICAST
1911 if (psf->sf_oldin &&
1912 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1913 psf->sf_crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1914 psf->sf_next = pmc->tomb;
1915 pmc->tomb = psf;
1916 rv = 1;
1917 } else
1918#endif
1919 kfree(psf);
1920 }
1921 return rv;
1922}
1923
1924#ifndef CONFIG_IP_MULTICAST
1925#define igmp_ifc_event(x) do { } while (0)
1926#endif
1927
1928static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1929 int sfcount, __be32 *psfsrc, int delta)
1930{
1931 struct ip_mc_list *pmc;
1932 int changerec = 0;
1933 int i, err;
1934
1935 if (!in_dev)
1936 return -ENODEV;
1937 rcu_read_lock();
1938 for_each_pmc_rcu(in_dev, pmc) {
1939 if (*pmca == pmc->multiaddr)
1940 break;
1941 }
1942 if (!pmc) {
1943 /* MCA not found?? bug */
1944 rcu_read_unlock();
1945 return -ESRCH;
1946 }
1947 spin_lock_bh(&pmc->lock);
1948 rcu_read_unlock();
1949#ifdef CONFIG_IP_MULTICAST
1950 sf_markstate(pmc);
1951#endif
1952 if (!delta) {
1953 err = -EINVAL;
1954 if (!pmc->sfcount[sfmode])
1955 goto out_unlock;
1956 pmc->sfcount[sfmode]--;
1957 }
1958 err = 0;
1959 for (i = 0; i < sfcount; i++) {
1960 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1961
1962 changerec |= rv > 0;
1963 if (!err && rv < 0)
1964 err = rv;
1965 }
1966 if (pmc->sfmode == MCAST_EXCLUDE &&
1967 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1968 pmc->sfcount[MCAST_INCLUDE]) {
1969#ifdef CONFIG_IP_MULTICAST
1970 struct ip_sf_list *psf;
1971 struct net *net = dev_net(in_dev->dev);
1972#endif
1973
1974 /* filter mode change */
1975 pmc->sfmode = MCAST_INCLUDE;
1976#ifdef CONFIG_IP_MULTICAST
1977 pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
1978 WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount);
1979 for (psf = pmc->sources; psf; psf = psf->sf_next)
1980 psf->sf_crcount = 0;
1981 igmp_ifc_event(pmc->interface);
1982 } else if (sf_setstate(pmc) || changerec) {
1983 igmp_ifc_event(pmc->interface);
1984#endif
1985 }
1986out_unlock:
1987 spin_unlock_bh(&pmc->lock);
1988 return err;
1989}
1990
1991/*
1992 * Add multicast single-source filter to the interface list
1993 */
1994static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1995 __be32 *psfsrc)
1996{
1997 struct ip_sf_list *psf, *psf_prev;
1998
1999 psf_prev = NULL;
2000 for (psf = pmc->sources; psf; psf = psf->sf_next) {
2001 if (psf->sf_inaddr == *psfsrc)
2002 break;
2003 psf_prev = psf;
2004 }
2005 if (!psf) {
2006 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
2007 if (!psf)
2008 return -ENOBUFS;
2009 psf->sf_inaddr = *psfsrc;
2010 if (psf_prev) {
2011 psf_prev->sf_next = psf;
2012 } else
2013 pmc->sources = psf;
2014 }
2015 psf->sf_count[sfmode]++;
2016 if (psf->sf_count[sfmode] == 1) {
2017 ip_rt_multicast_event(pmc->interface);
2018 }
2019 return 0;
2020}
2021
2022#ifdef CONFIG_IP_MULTICAST
2023static void sf_markstate(struct ip_mc_list *pmc)
2024{
2025 struct ip_sf_list *psf;
2026 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
2027
2028 for (psf = pmc->sources; psf; psf = psf->sf_next)
2029 if (pmc->sfcount[MCAST_EXCLUDE]) {
2030 psf->sf_oldin = mca_xcount ==
2031 psf->sf_count[MCAST_EXCLUDE] &&
2032 !psf->sf_count[MCAST_INCLUDE];
2033 } else
2034 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2035}
2036
2037static int sf_setstate(struct ip_mc_list *pmc)
2038{
2039 struct ip_sf_list *psf, *dpsf;
2040 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
2041 int qrv = pmc->interface->mr_qrv;
2042 int new_in, rv;
2043
2044 rv = 0;
2045 for (psf = pmc->sources; psf; psf = psf->sf_next) {
2046 if (pmc->sfcount[MCAST_EXCLUDE]) {
2047 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2048 !psf->sf_count[MCAST_INCLUDE];
2049 } else
2050 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2051 if (new_in) {
2052 if (!psf->sf_oldin) {
2053 struct ip_sf_list *prev = NULL;
2054
2055 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
2056 if (dpsf->sf_inaddr == psf->sf_inaddr)
2057 break;
2058 prev = dpsf;
2059 }
2060 if (dpsf) {
2061 if (prev)
2062 prev->sf_next = dpsf->sf_next;
2063 else
2064 pmc->tomb = dpsf->sf_next;
2065 kfree(dpsf);
2066 }
2067 psf->sf_crcount = qrv;
2068 rv++;
2069 }
2070 } else if (psf->sf_oldin) {
2071
2072 psf->sf_crcount = 0;
2073 /*
2074 * add or update "delete" records if an active filter
2075 * is now inactive
2076 */
2077 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
2078 if (dpsf->sf_inaddr == psf->sf_inaddr)
2079 break;
2080 if (!dpsf) {
2081 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2082 if (!dpsf)
2083 continue;
2084 *dpsf = *psf;
2085 /* pmc->lock held by callers */
2086 dpsf->sf_next = pmc->tomb;
2087 pmc->tomb = dpsf;
2088 }
2089 dpsf->sf_crcount = qrv;
2090 rv++;
2091 }
2092 }
2093 return rv;
2094}
2095#endif
2096
2097/*
2098 * Add multicast source filter list to the interface list
2099 */
2100static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2101 int sfcount, __be32 *psfsrc, int delta)
2102{
2103 struct ip_mc_list *pmc;
2104 int isexclude;
2105 int i, err;
2106
2107 if (!in_dev)
2108 return -ENODEV;
2109 rcu_read_lock();
2110 for_each_pmc_rcu(in_dev, pmc) {
2111 if (*pmca == pmc->multiaddr)
2112 break;
2113 }
2114 if (!pmc) {
2115 /* MCA not found?? bug */
2116 rcu_read_unlock();
2117 return -ESRCH;
2118 }
2119 spin_lock_bh(&pmc->lock);
2120 rcu_read_unlock();
2121
2122#ifdef CONFIG_IP_MULTICAST
2123 sf_markstate(pmc);
2124#endif
2125 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2126 if (!delta)
2127 pmc->sfcount[sfmode]++;
2128 err = 0;
2129 for (i = 0; i < sfcount; i++) {
2130 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2131 if (err)
2132 break;
2133 }
2134 if (err) {
2135 int j;
2136
2137 if (!delta)
2138 pmc->sfcount[sfmode]--;
2139 for (j = 0; j < i; j++)
2140 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2141 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2142#ifdef CONFIG_IP_MULTICAST
2143 struct ip_sf_list *psf;
2144 struct net *net = dev_net(pmc->interface->dev);
2145 in_dev = pmc->interface;
2146#endif
2147
2148 /* filter mode change */
2149 if (pmc->sfcount[MCAST_EXCLUDE])
2150 pmc->sfmode = MCAST_EXCLUDE;
2151 else if (pmc->sfcount[MCAST_INCLUDE])
2152 pmc->sfmode = MCAST_INCLUDE;
2153#ifdef CONFIG_IP_MULTICAST
2154 /* else no filters; keep old mode for reports */
2155
2156 pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);
2157 WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount);
2158 for (psf = pmc->sources; psf; psf = psf->sf_next)
2159 psf->sf_crcount = 0;
2160 igmp_ifc_event(in_dev);
2161 } else if (sf_setstate(pmc)) {
2162 igmp_ifc_event(in_dev);
2163#endif
2164 }
2165 spin_unlock_bh(&pmc->lock);
2166 return err;
2167}
2168
2169static void ip_mc_clear_src(struct ip_mc_list *pmc)
2170{
2171 struct ip_sf_list *tomb, *sources;
2172
2173 spin_lock_bh(&pmc->lock);
2174 tomb = pmc->tomb;
2175 pmc->tomb = NULL;
2176 sources = pmc->sources;
2177 pmc->sources = NULL;
2178 pmc->sfmode = MCAST_EXCLUDE;
2179 pmc->sfcount[MCAST_INCLUDE] = 0;
2180 pmc->sfcount[MCAST_EXCLUDE] = 1;
2181 spin_unlock_bh(&pmc->lock);
2182
2183 ip_sf_list_clear_all(tomb);
2184 ip_sf_list_clear_all(sources);
2185}
2186
2187/* Join a multicast group
2188 */
2189static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr,
2190 unsigned int mode)
2191{
2192 __be32 addr = imr->imr_multiaddr.s_addr;
2193 struct ip_mc_socklist *iml, *i;
2194 struct in_device *in_dev;
2195 struct inet_sock *inet = inet_sk(sk);
2196 struct net *net = sock_net(sk);
2197 int ifindex;
2198 int count = 0;
2199 int err;
2200
2201 ASSERT_RTNL();
2202
2203 if (!ipv4_is_multicast(addr))
2204 return -EINVAL;
2205
2206 in_dev = ip_mc_find_dev(net, imr);
2207
2208 if (!in_dev) {
2209 err = -ENODEV;
2210 goto done;
2211 }
2212
2213 err = -EADDRINUSE;
2214 ifindex = imr->imr_ifindex;
2215 for_each_pmc_rtnl(inet, i) {
2216 if (i->multi.imr_multiaddr.s_addr == addr &&
2217 i->multi.imr_ifindex == ifindex)
2218 goto done;
2219 count++;
2220 }
2221 err = -ENOBUFS;
2222 if (count >= READ_ONCE(net->ipv4.sysctl_igmp_max_memberships))
2223 goto done;
2224 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2225 if (!iml)
2226 goto done;
2227
2228 memcpy(&iml->multi, imr, sizeof(*imr));
2229 iml->next_rcu = inet->mc_list;
2230 iml->sflist = NULL;
2231 iml->sfmode = mode;
2232 rcu_assign_pointer(inet->mc_list, iml);
2233 ____ip_mc_inc_group(in_dev, addr, mode, GFP_KERNEL);
2234 err = 0;
2235done:
2236 return err;
2237}
2238
2239/* Join ASM (Any-Source Multicast) group
2240 */
2241int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2242{
2243 return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE);
2244}
2245EXPORT_SYMBOL(ip_mc_join_group);
2246
2247/* Join SSM (Source-Specific Multicast) group
2248 */
2249int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr,
2250 unsigned int mode)
2251{
2252 return __ip_mc_join_group(sk, imr, mode);
2253}
2254
2255static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2256 struct in_device *in_dev)
2257{
2258 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2259 int err;
2260
2261 if (!psf) {
2262 /* any-source empty exclude case */
2263 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2264 iml->sfmode, 0, NULL, 0);
2265 }
2266 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2267 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2268 RCU_INIT_POINTER(iml->sflist, NULL);
2269 /* decrease mem now to avoid the memleak warning */
2270 atomic_sub(struct_size(psf, sl_addr, psf->sl_max), &sk->sk_omem_alloc);
2271 kfree_rcu(psf, rcu);
2272 return err;
2273}
2274
2275int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2276{
2277 struct inet_sock *inet = inet_sk(sk);
2278 struct ip_mc_socklist *iml;
2279 struct ip_mc_socklist __rcu **imlp;
2280 struct in_device *in_dev;
2281 struct net *net = sock_net(sk);
2282 __be32 group = imr->imr_multiaddr.s_addr;
2283 u32 ifindex;
2284 int ret = -EADDRNOTAVAIL;
2285
2286 ASSERT_RTNL();
2287
2288 in_dev = ip_mc_find_dev(net, imr);
2289 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2290 ret = -ENODEV;
2291 goto out;
2292 }
2293 ifindex = imr->imr_ifindex;
2294 for (imlp = &inet->mc_list;
2295 (iml = rtnl_dereference(*imlp)) != NULL;
2296 imlp = &iml->next_rcu) {
2297 if (iml->multi.imr_multiaddr.s_addr != group)
2298 continue;
2299 if (ifindex) {
2300 if (iml->multi.imr_ifindex != ifindex)
2301 continue;
2302 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2303 iml->multi.imr_address.s_addr)
2304 continue;
2305
2306 (void) ip_mc_leave_src(sk, iml, in_dev);
2307
2308 *imlp = iml->next_rcu;
2309
2310 if (in_dev)
2311 ip_mc_dec_group(in_dev, group);
2312
2313 /* decrease mem now to avoid the memleak warning */
2314 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2315 kfree_rcu(iml, rcu);
2316 return 0;
2317 }
2318out:
2319 return ret;
2320}
2321EXPORT_SYMBOL(ip_mc_leave_group);
2322
2323int ip_mc_source(int add, int omode, struct sock *sk, struct
2324 ip_mreq_source *mreqs, int ifindex)
2325{
2326 int err;
2327 struct ip_mreqn imr;
2328 __be32 addr = mreqs->imr_multiaddr;
2329 struct ip_mc_socklist *pmc;
2330 struct in_device *in_dev = NULL;
2331 struct inet_sock *inet = inet_sk(sk);
2332 struct ip_sf_socklist *psl;
2333 struct net *net = sock_net(sk);
2334 int leavegroup = 0;
2335 int i, j, rv;
2336
2337 if (!ipv4_is_multicast(addr))
2338 return -EINVAL;
2339
2340 ASSERT_RTNL();
2341
2342 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2343 imr.imr_address.s_addr = mreqs->imr_interface;
2344 imr.imr_ifindex = ifindex;
2345 in_dev = ip_mc_find_dev(net, &imr);
2346
2347 if (!in_dev) {
2348 err = -ENODEV;
2349 goto done;
2350 }
2351 err = -EADDRNOTAVAIL;
2352
2353 for_each_pmc_rtnl(inet, pmc) {
2354 if ((pmc->multi.imr_multiaddr.s_addr ==
2355 imr.imr_multiaddr.s_addr) &&
2356 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2357 break;
2358 }
2359 if (!pmc) { /* must have a prior join */
2360 err = -EINVAL;
2361 goto done;
2362 }
2363 /* if a source filter was set, must be the same mode as before */
2364 if (pmc->sflist) {
2365 if (pmc->sfmode != omode) {
2366 err = -EINVAL;
2367 goto done;
2368 }
2369 } else if (pmc->sfmode != omode) {
2370 /* allow mode switches for empty-set filters */
2371 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2372 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2373 NULL, 0);
2374 pmc->sfmode = omode;
2375 }
2376
2377 psl = rtnl_dereference(pmc->sflist);
2378 if (!add) {
2379 if (!psl)
2380 goto done; /* err = -EADDRNOTAVAIL */
2381 rv = !0;
2382 for (i = 0; i < psl->sl_count; i++) {
2383 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2384 sizeof(__be32));
2385 if (rv == 0)
2386 break;
2387 }
2388 if (rv) /* source not found */
2389 goto done; /* err = -EADDRNOTAVAIL */
2390
2391 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2392 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2393 leavegroup = 1;
2394 goto done;
2395 }
2396
2397 /* update the interface filter */
2398 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2399 &mreqs->imr_sourceaddr, 1);
2400
2401 for (j = i+1; j < psl->sl_count; j++)
2402 psl->sl_addr[j-1] = psl->sl_addr[j];
2403 psl->sl_count--;
2404 err = 0;
2405 goto done;
2406 }
2407 /* else, add a new source to the filter */
2408
2409 if (psl && psl->sl_count >= READ_ONCE(net->ipv4.sysctl_igmp_max_msf)) {
2410 err = -ENOBUFS;
2411 goto done;
2412 }
2413 if (!psl || psl->sl_count == psl->sl_max) {
2414 struct ip_sf_socklist *newpsl;
2415 int count = IP_SFBLOCK;
2416
2417 if (psl)
2418 count += psl->sl_max;
2419 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count),
2420 GFP_KERNEL);
2421 if (!newpsl) {
2422 err = -ENOBUFS;
2423 goto done;
2424 }
2425 newpsl->sl_max = count;
2426 newpsl->sl_count = count - IP_SFBLOCK;
2427 if (psl) {
2428 for (i = 0; i < psl->sl_count; i++)
2429 newpsl->sl_addr[i] = psl->sl_addr[i];
2430 /* decrease mem now to avoid the memleak warning */
2431 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2432 &sk->sk_omem_alloc);
2433 }
2434 rcu_assign_pointer(pmc->sflist, newpsl);
2435 if (psl)
2436 kfree_rcu(psl, rcu);
2437 psl = newpsl;
2438 }
2439 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2440 for (i = 0; i < psl->sl_count; i++) {
2441 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2442 sizeof(__be32));
2443 if (rv == 0)
2444 break;
2445 }
2446 if (rv == 0) /* address already there is an error */
2447 goto done;
2448 for (j = psl->sl_count-1; j >= i; j--)
2449 psl->sl_addr[j+1] = psl->sl_addr[j];
2450 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2451 psl->sl_count++;
2452 err = 0;
2453 /* update the interface list */
2454 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2455 &mreqs->imr_sourceaddr, 1);
2456done:
2457 if (leavegroup)
2458 err = ip_mc_leave_group(sk, &imr);
2459 return err;
2460}
2461
2462int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2463{
2464 int err = 0;
2465 struct ip_mreqn imr;
2466 __be32 addr = msf->imsf_multiaddr;
2467 struct ip_mc_socklist *pmc;
2468 struct in_device *in_dev;
2469 struct inet_sock *inet = inet_sk(sk);
2470 struct ip_sf_socklist *newpsl, *psl;
2471 struct net *net = sock_net(sk);
2472 int leavegroup = 0;
2473
2474 if (!ipv4_is_multicast(addr))
2475 return -EINVAL;
2476 if (msf->imsf_fmode != MCAST_INCLUDE &&
2477 msf->imsf_fmode != MCAST_EXCLUDE)
2478 return -EINVAL;
2479
2480 ASSERT_RTNL();
2481
2482 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2483 imr.imr_address.s_addr = msf->imsf_interface;
2484 imr.imr_ifindex = ifindex;
2485 in_dev = ip_mc_find_dev(net, &imr);
2486
2487 if (!in_dev) {
2488 err = -ENODEV;
2489 goto done;
2490 }
2491
2492 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2493 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2494 leavegroup = 1;
2495 goto done;
2496 }
2497
2498 for_each_pmc_rtnl(inet, pmc) {
2499 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2500 pmc->multi.imr_ifindex == imr.imr_ifindex)
2501 break;
2502 }
2503 if (!pmc) { /* must have a prior join */
2504 err = -EINVAL;
2505 goto done;
2506 }
2507 if (msf->imsf_numsrc) {
2508 newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr,
2509 msf->imsf_numsrc),
2510 GFP_KERNEL);
2511 if (!newpsl) {
2512 err = -ENOBUFS;
2513 goto done;
2514 }
2515 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2516 memcpy(newpsl->sl_addr, msf->imsf_slist_flex,
2517 flex_array_size(msf, imsf_slist_flex, msf->imsf_numsrc));
2518 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2519 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2520 if (err) {
2521 sock_kfree_s(sk, newpsl,
2522 struct_size(newpsl, sl_addr,
2523 newpsl->sl_max));
2524 goto done;
2525 }
2526 } else {
2527 newpsl = NULL;
2528 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2529 msf->imsf_fmode, 0, NULL, 0);
2530 }
2531 psl = rtnl_dereference(pmc->sflist);
2532 if (psl) {
2533 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2534 psl->sl_count, psl->sl_addr, 0);
2535 /* decrease mem now to avoid the memleak warning */
2536 atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2537 &sk->sk_omem_alloc);
2538 } else {
2539 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2540 0, NULL, 0);
2541 }
2542 rcu_assign_pointer(pmc->sflist, newpsl);
2543 if (psl)
2544 kfree_rcu(psl, rcu);
2545 pmc->sfmode = msf->imsf_fmode;
2546 err = 0;
2547done:
2548 if (leavegroup)
2549 err = ip_mc_leave_group(sk, &imr);
2550 return err;
2551}
2552int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2553 sockptr_t optval, sockptr_t optlen)
2554{
2555 int err, len, count, copycount, msf_size;
2556 struct ip_mreqn imr;
2557 __be32 addr = msf->imsf_multiaddr;
2558 struct ip_mc_socklist *pmc;
2559 struct in_device *in_dev;
2560 struct inet_sock *inet = inet_sk(sk);
2561 struct ip_sf_socklist *psl;
2562 struct net *net = sock_net(sk);
2563
2564 ASSERT_RTNL();
2565
2566 if (!ipv4_is_multicast(addr))
2567 return -EINVAL;
2568
2569 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2570 imr.imr_address.s_addr = msf->imsf_interface;
2571 imr.imr_ifindex = 0;
2572 in_dev = ip_mc_find_dev(net, &imr);
2573
2574 if (!in_dev) {
2575 err = -ENODEV;
2576 goto done;
2577 }
2578 err = -EADDRNOTAVAIL;
2579
2580 for_each_pmc_rtnl(inet, pmc) {
2581 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2582 pmc->multi.imr_ifindex == imr.imr_ifindex)
2583 break;
2584 }
2585 if (!pmc) /* must have a prior join */
2586 goto done;
2587 msf->imsf_fmode = pmc->sfmode;
2588 psl = rtnl_dereference(pmc->sflist);
2589 if (!psl) {
2590 count = 0;
2591 } else {
2592 count = psl->sl_count;
2593 }
2594 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2595 len = flex_array_size(psl, sl_addr, copycount);
2596 msf->imsf_numsrc = count;
2597 msf_size = IP_MSFILTER_SIZE(copycount);
2598 if (copy_to_sockptr(optlen, &msf_size, sizeof(int)) ||
2599 copy_to_sockptr(optval, msf, IP_MSFILTER_SIZE(0))) {
2600 return -EFAULT;
2601 }
2602 if (len &&
2603 copy_to_sockptr_offset(optval,
2604 offsetof(struct ip_msfilter, imsf_slist_flex),
2605 psl->sl_addr, len))
2606 return -EFAULT;
2607 return 0;
2608done:
2609 return err;
2610}
2611
2612int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2613 sockptr_t optval, size_t ss_offset)
2614{
2615 int i, count, copycount;
2616 struct sockaddr_in *psin;
2617 __be32 addr;
2618 struct ip_mc_socklist *pmc;
2619 struct inet_sock *inet = inet_sk(sk);
2620 struct ip_sf_socklist *psl;
2621
2622 ASSERT_RTNL();
2623
2624 psin = (struct sockaddr_in *)&gsf->gf_group;
2625 if (psin->sin_family != AF_INET)
2626 return -EINVAL;
2627 addr = psin->sin_addr.s_addr;
2628 if (!ipv4_is_multicast(addr))
2629 return -EINVAL;
2630
2631 for_each_pmc_rtnl(inet, pmc) {
2632 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2633 pmc->multi.imr_ifindex == gsf->gf_interface)
2634 break;
2635 }
2636 if (!pmc) /* must have a prior join */
2637 return -EADDRNOTAVAIL;
2638 gsf->gf_fmode = pmc->sfmode;
2639 psl = rtnl_dereference(pmc->sflist);
2640 count = psl ? psl->sl_count : 0;
2641 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2642 gsf->gf_numsrc = count;
2643 for (i = 0; i < copycount; i++) {
2644 struct sockaddr_storage ss;
2645
2646 psin = (struct sockaddr_in *)&ss;
2647 memset(&ss, 0, sizeof(ss));
2648 psin->sin_family = AF_INET;
2649 psin->sin_addr.s_addr = psl->sl_addr[i];
2650 if (copy_to_sockptr_offset(optval, ss_offset,
2651 &ss, sizeof(ss)))
2652 return -EFAULT;
2653 ss_offset += sizeof(ss);
2654 }
2655 return 0;
2656}
2657
2658/*
2659 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2660 */
2661int ip_mc_sf_allow(const struct sock *sk, __be32 loc_addr, __be32 rmt_addr,
2662 int dif, int sdif)
2663{
2664 const struct inet_sock *inet = inet_sk(sk);
2665 struct ip_mc_socklist *pmc;
2666 struct ip_sf_socklist *psl;
2667 int i;
2668 int ret;
2669
2670 ret = 1;
2671 if (!ipv4_is_multicast(loc_addr))
2672 goto out;
2673
2674 rcu_read_lock();
2675 for_each_pmc_rcu(inet, pmc) {
2676 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2677 (pmc->multi.imr_ifindex == dif ||
2678 (sdif && pmc->multi.imr_ifindex == sdif)))
2679 break;
2680 }
2681 ret = inet_test_bit(MC_ALL, sk);
2682 if (!pmc)
2683 goto unlock;
2684 psl = rcu_dereference(pmc->sflist);
2685 ret = (pmc->sfmode == MCAST_EXCLUDE);
2686 if (!psl)
2687 goto unlock;
2688
2689 for (i = 0; i < psl->sl_count; i++) {
2690 if (psl->sl_addr[i] == rmt_addr)
2691 break;
2692 }
2693 ret = 0;
2694 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2695 goto unlock;
2696 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2697 goto unlock;
2698 ret = 1;
2699unlock:
2700 rcu_read_unlock();
2701out:
2702 return ret;
2703}
2704
2705/*
2706 * A socket is closing.
2707 */
2708
2709void ip_mc_drop_socket(struct sock *sk)
2710{
2711 struct inet_sock *inet = inet_sk(sk);
2712 struct ip_mc_socklist *iml;
2713 struct net *net = sock_net(sk);
2714
2715 if (!inet->mc_list)
2716 return;
2717
2718 rtnl_lock();
2719 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2720 struct in_device *in_dev;
2721
2722 inet->mc_list = iml->next_rcu;
2723 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2724 (void) ip_mc_leave_src(sk, iml, in_dev);
2725 if (in_dev)
2726 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2727 /* decrease mem now to avoid the memleak warning */
2728 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2729 kfree_rcu(iml, rcu);
2730 }
2731 rtnl_unlock();
2732}
2733
2734/* called with rcu_read_lock() */
2735int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2736{
2737 struct ip_mc_list *im;
2738 struct ip_mc_list __rcu **mc_hash;
2739 struct ip_sf_list *psf;
2740 int rv = 0;
2741
2742 mc_hash = rcu_dereference(in_dev->mc_hash);
2743 if (mc_hash) {
2744 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2745
2746 for (im = rcu_dereference(mc_hash[hash]);
2747 im != NULL;
2748 im = rcu_dereference(im->next_hash)) {
2749 if (im->multiaddr == mc_addr)
2750 break;
2751 }
2752 } else {
2753 for_each_pmc_rcu(in_dev, im) {
2754 if (im->multiaddr == mc_addr)
2755 break;
2756 }
2757 }
2758 if (im && proto == IPPROTO_IGMP) {
2759 rv = 1;
2760 } else if (im) {
2761 if (src_addr) {
2762 spin_lock_bh(&im->lock);
2763 for (psf = im->sources; psf; psf = psf->sf_next) {
2764 if (psf->sf_inaddr == src_addr)
2765 break;
2766 }
2767 if (psf)
2768 rv = psf->sf_count[MCAST_INCLUDE] ||
2769 psf->sf_count[MCAST_EXCLUDE] !=
2770 im->sfcount[MCAST_EXCLUDE];
2771 else
2772 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2773 spin_unlock_bh(&im->lock);
2774 } else
2775 rv = 1; /* unspecified source; tentatively allow */
2776 }
2777 return rv;
2778}
2779
2780#if defined(CONFIG_PROC_FS)
2781struct igmp_mc_iter_state {
2782 struct seq_net_private p;
2783 struct net_device *dev;
2784 struct in_device *in_dev;
2785};
2786
2787#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2788
2789static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2790{
2791 struct net *net = seq_file_net(seq);
2792 struct ip_mc_list *im = NULL;
2793 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2794
2795 state->in_dev = NULL;
2796 for_each_netdev_rcu(net, state->dev) {
2797 struct in_device *in_dev;
2798
2799 in_dev = __in_dev_get_rcu(state->dev);
2800 if (!in_dev)
2801 continue;
2802 im = rcu_dereference(in_dev->mc_list);
2803 if (im) {
2804 state->in_dev = in_dev;
2805 break;
2806 }
2807 }
2808 return im;
2809}
2810
2811static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2812{
2813 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2814
2815 im = rcu_dereference(im->next_rcu);
2816 while (!im) {
2817 state->dev = next_net_device_rcu(state->dev);
2818 if (!state->dev) {
2819 state->in_dev = NULL;
2820 break;
2821 }
2822 state->in_dev = __in_dev_get_rcu(state->dev);
2823 if (!state->in_dev)
2824 continue;
2825 im = rcu_dereference(state->in_dev->mc_list);
2826 }
2827 return im;
2828}
2829
2830static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2831{
2832 struct ip_mc_list *im = igmp_mc_get_first(seq);
2833 if (im)
2834 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2835 --pos;
2836 return pos ? NULL : im;
2837}
2838
2839static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2840 __acquires(rcu)
2841{
2842 rcu_read_lock();
2843 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2844}
2845
2846static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2847{
2848 struct ip_mc_list *im;
2849 if (v == SEQ_START_TOKEN)
2850 im = igmp_mc_get_first(seq);
2851 else
2852 im = igmp_mc_get_next(seq, v);
2853 ++*pos;
2854 return im;
2855}
2856
2857static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2858 __releases(rcu)
2859{
2860 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2861
2862 state->in_dev = NULL;
2863 state->dev = NULL;
2864 rcu_read_unlock();
2865}
2866
2867static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2868{
2869 if (v == SEQ_START_TOKEN)
2870 seq_puts(seq,
2871 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2872 else {
2873 struct ip_mc_list *im = v;
2874 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2875 char *querier;
2876 long delta;
2877
2878#ifdef CONFIG_IP_MULTICAST
2879 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2880 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2881 "V3";
2882#else
2883 querier = "NONE";
2884#endif
2885
2886 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2887 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2888 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2889 }
2890
2891 delta = im->timer.expires - jiffies;
2892 seq_printf(seq,
2893 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2894 im->multiaddr, im->users,
2895 im->tm_running,
2896 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2897 im->reporter);
2898 }
2899 return 0;
2900}
2901
2902static const struct seq_operations igmp_mc_seq_ops = {
2903 .start = igmp_mc_seq_start,
2904 .next = igmp_mc_seq_next,
2905 .stop = igmp_mc_seq_stop,
2906 .show = igmp_mc_seq_show,
2907};
2908
2909struct igmp_mcf_iter_state {
2910 struct seq_net_private p;
2911 struct net_device *dev;
2912 struct in_device *idev;
2913 struct ip_mc_list *im;
2914};
2915
2916#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2917
2918static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2919{
2920 struct net *net = seq_file_net(seq);
2921 struct ip_sf_list *psf = NULL;
2922 struct ip_mc_list *im = NULL;
2923 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2924
2925 state->idev = NULL;
2926 state->im = NULL;
2927 for_each_netdev_rcu(net, state->dev) {
2928 struct in_device *idev;
2929 idev = __in_dev_get_rcu(state->dev);
2930 if (unlikely(!idev))
2931 continue;
2932 im = rcu_dereference(idev->mc_list);
2933 if (likely(im)) {
2934 spin_lock_bh(&im->lock);
2935 psf = im->sources;
2936 if (likely(psf)) {
2937 state->im = im;
2938 state->idev = idev;
2939 break;
2940 }
2941 spin_unlock_bh(&im->lock);
2942 }
2943 }
2944 return psf;
2945}
2946
2947static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2948{
2949 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2950
2951 psf = psf->sf_next;
2952 while (!psf) {
2953 spin_unlock_bh(&state->im->lock);
2954 state->im = state->im->next;
2955 while (!state->im) {
2956 state->dev = next_net_device_rcu(state->dev);
2957 if (!state->dev) {
2958 state->idev = NULL;
2959 goto out;
2960 }
2961 state->idev = __in_dev_get_rcu(state->dev);
2962 if (!state->idev)
2963 continue;
2964 state->im = rcu_dereference(state->idev->mc_list);
2965 }
2966 spin_lock_bh(&state->im->lock);
2967 psf = state->im->sources;
2968 }
2969out:
2970 return psf;
2971}
2972
2973static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2974{
2975 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2976 if (psf)
2977 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2978 --pos;
2979 return pos ? NULL : psf;
2980}
2981
2982static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2983 __acquires(rcu)
2984{
2985 rcu_read_lock();
2986 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2987}
2988
2989static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2990{
2991 struct ip_sf_list *psf;
2992 if (v == SEQ_START_TOKEN)
2993 psf = igmp_mcf_get_first(seq);
2994 else
2995 psf = igmp_mcf_get_next(seq, v);
2996 ++*pos;
2997 return psf;
2998}
2999
3000static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
3001 __releases(rcu)
3002{
3003 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
3004 if (likely(state->im)) {
3005 spin_unlock_bh(&state->im->lock);
3006 state->im = NULL;
3007 }
3008 state->idev = NULL;
3009 state->dev = NULL;
3010 rcu_read_unlock();
3011}
3012
3013static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
3014{
3015 struct ip_sf_list *psf = v;
3016 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
3017
3018 if (v == SEQ_START_TOKEN) {
3019 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
3020 } else {
3021 seq_printf(seq,
3022 "%3d %6.6s 0x%08x "
3023 "0x%08x %6lu %6lu\n",
3024 state->dev->ifindex, state->dev->name,
3025 ntohl(state->im->multiaddr),
3026 ntohl(psf->sf_inaddr),
3027 psf->sf_count[MCAST_INCLUDE],
3028 psf->sf_count[MCAST_EXCLUDE]);
3029 }
3030 return 0;
3031}
3032
3033static const struct seq_operations igmp_mcf_seq_ops = {
3034 .start = igmp_mcf_seq_start,
3035 .next = igmp_mcf_seq_next,
3036 .stop = igmp_mcf_seq_stop,
3037 .show = igmp_mcf_seq_show,
3038};
3039
3040static int __net_init igmp_net_init(struct net *net)
3041{
3042 struct proc_dir_entry *pde;
3043 int err;
3044
3045 pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops,
3046 sizeof(struct igmp_mc_iter_state));
3047 if (!pde)
3048 goto out_igmp;
3049 pde = proc_create_net("mcfilter", 0444, net->proc_net,
3050 &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state));
3051 if (!pde)
3052 goto out_mcfilter;
3053 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
3054 SOCK_DGRAM, 0, net);
3055 if (err < 0) {
3056 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
3057 err);
3058 goto out_sock;
3059 }
3060
3061 return 0;
3062
3063out_sock:
3064 remove_proc_entry("mcfilter", net->proc_net);
3065out_mcfilter:
3066 remove_proc_entry("igmp", net->proc_net);
3067out_igmp:
3068 return -ENOMEM;
3069}
3070
3071static void __net_exit igmp_net_exit(struct net *net)
3072{
3073 remove_proc_entry("mcfilter", net->proc_net);
3074 remove_proc_entry("igmp", net->proc_net);
3075 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
3076}
3077
3078static struct pernet_operations igmp_net_ops = {
3079 .init = igmp_net_init,
3080 .exit = igmp_net_exit,
3081};
3082#endif
3083
3084static int igmp_netdev_event(struct notifier_block *this,
3085 unsigned long event, void *ptr)
3086{
3087 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3088 struct in_device *in_dev;
3089
3090 switch (event) {
3091 case NETDEV_RESEND_IGMP:
3092 in_dev = __in_dev_get_rtnl(dev);
3093 if (in_dev)
3094 ip_mc_rejoin_groups(in_dev);
3095 break;
3096 default:
3097 break;
3098 }
3099 return NOTIFY_DONE;
3100}
3101
3102static struct notifier_block igmp_notifier = {
3103 .notifier_call = igmp_netdev_event,
3104};
3105
3106int __init igmp_mc_init(void)
3107{
3108#if defined(CONFIG_PROC_FS)
3109 int err;
3110
3111 err = register_pernet_subsys(&igmp_net_ops);
3112 if (err)
3113 return err;
3114 err = register_netdevice_notifier(&igmp_notifier);
3115 if (err)
3116 goto reg_notif_fail;
3117 return 0;
3118
3119reg_notif_fail:
3120 unregister_pernet_subsys(&igmp_net_ops);
3121 return err;
3122#else
3123 return register_netdevice_notifier(&igmp_notifier);
3124#endif
3125}
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 <linux/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#include <linux/pkt_sched.h>
92#include <linux/byteorder/generic.h>
93
94#include <net/net_namespace.h>
95#include <net/arp.h>
96#include <net/ip.h>
97#include <net/protocol.h>
98#include <net/route.h>
99#include <net/sock.h>
100#include <net/checksum.h>
101#include <net/inet_common.h>
102#include <linux/netfilter_ipv4.h>
103#ifdef CONFIG_IP_MROUTE
104#include <linux/mroute.h>
105#endif
106#ifdef CONFIG_PROC_FS
107#include <linux/proc_fs.h>
108#include <linux/seq_file.h>
109#endif
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_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
117#define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
118#define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
119#define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
120
121
122#define IGMP_INITIAL_REPORT_DELAY (1)
123
124/* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
125 * IGMP specs require to report membership immediately after
126 * joining a group, but we delay the first report by a
127 * small interval. It seems more natural and still does not
128 * contradict to specs provided this delay is small enough.
129 */
130
131#define IGMP_V1_SEEN(in_dev) \
132 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
133 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
134 ((in_dev)->mr_v1_seen && \
135 time_before(jiffies, (in_dev)->mr_v1_seen)))
136#define IGMP_V2_SEEN(in_dev) \
137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
139 ((in_dev)->mr_v2_seen && \
140 time_before(jiffies, (in_dev)->mr_v2_seen)))
141
142static int unsolicited_report_interval(struct in_device *in_dev)
143{
144 int interval_ms, interval_jiffies;
145
146 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
147 interval_ms = IN_DEV_CONF_GET(
148 in_dev,
149 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
150 else /* v3 */
151 interval_ms = IN_DEV_CONF_GET(
152 in_dev,
153 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
154
155 interval_jiffies = msecs_to_jiffies(interval_ms);
156
157 /* _timer functions can't handle a delay of 0 jiffies so ensure
158 * we always return a positive value.
159 */
160 if (interval_jiffies <= 0)
161 interval_jiffies = 1;
162 return interval_jiffies;
163}
164
165static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
166static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
167static void igmpv3_clear_delrec(struct in_device *in_dev);
168static int sf_setstate(struct ip_mc_list *pmc);
169static void sf_markstate(struct ip_mc_list *pmc);
170#endif
171static void ip_mc_clear_src(struct ip_mc_list *pmc);
172static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
173 int sfcount, __be32 *psfsrc, int delta);
174
175static void ip_ma_put(struct ip_mc_list *im)
176{
177 if (refcount_dec_and_test(&im->refcnt)) {
178 in_dev_put(im->interface);
179 kfree_rcu(im, rcu);
180 }
181}
182
183#define for_each_pmc_rcu(in_dev, pmc) \
184 for (pmc = rcu_dereference(in_dev->mc_list); \
185 pmc != NULL; \
186 pmc = rcu_dereference(pmc->next_rcu))
187
188#define for_each_pmc_rtnl(in_dev, pmc) \
189 for (pmc = rtnl_dereference(in_dev->mc_list); \
190 pmc != NULL; \
191 pmc = rtnl_dereference(pmc->next_rcu))
192
193#ifdef CONFIG_IP_MULTICAST
194
195/*
196 * Timer management
197 */
198
199static void igmp_stop_timer(struct ip_mc_list *im)
200{
201 spin_lock_bh(&im->lock);
202 if (del_timer(&im->timer))
203 refcount_dec(&im->refcnt);
204 im->tm_running = 0;
205 im->reporter = 0;
206 im->unsolicit_count = 0;
207 spin_unlock_bh(&im->lock);
208}
209
210/* It must be called with locked im->lock */
211static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
212{
213 int tv = prandom_u32() % max_delay;
214
215 im->tm_running = 1;
216 if (!mod_timer(&im->timer, jiffies+tv+2))
217 refcount_inc(&im->refcnt);
218}
219
220static void igmp_gq_start_timer(struct in_device *in_dev)
221{
222 int tv = prandom_u32() % in_dev->mr_maxdelay;
223 unsigned long exp = jiffies + tv + 2;
224
225 if (in_dev->mr_gq_running &&
226 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
227 return;
228
229 in_dev->mr_gq_running = 1;
230 if (!mod_timer(&in_dev->mr_gq_timer, exp))
231 in_dev_hold(in_dev);
232}
233
234static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
235{
236 int tv = prandom_u32() % delay;
237
238 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
239 in_dev_hold(in_dev);
240}
241
242static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
243{
244 spin_lock_bh(&im->lock);
245 im->unsolicit_count = 0;
246 if (del_timer(&im->timer)) {
247 if ((long)(im->timer.expires-jiffies) < max_delay) {
248 add_timer(&im->timer);
249 im->tm_running = 1;
250 spin_unlock_bh(&im->lock);
251 return;
252 }
253 refcount_dec(&im->refcnt);
254 }
255 igmp_start_timer(im, max_delay);
256 spin_unlock_bh(&im->lock);
257}
258
259
260/*
261 * Send an IGMP report.
262 */
263
264#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
265
266
267static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
268 int gdeleted, int sdeleted)
269{
270 switch (type) {
271 case IGMPV3_MODE_IS_INCLUDE:
272 case IGMPV3_MODE_IS_EXCLUDE:
273 if (gdeleted || sdeleted)
274 return 0;
275 if (!(pmc->gsquery && !psf->sf_gsresp)) {
276 if (pmc->sfmode == MCAST_INCLUDE)
277 return 1;
278 /* don't include if this source is excluded
279 * in all filters
280 */
281 if (psf->sf_count[MCAST_INCLUDE])
282 return type == IGMPV3_MODE_IS_INCLUDE;
283 return pmc->sfcount[MCAST_EXCLUDE] ==
284 psf->sf_count[MCAST_EXCLUDE];
285 }
286 return 0;
287 case IGMPV3_CHANGE_TO_INCLUDE:
288 if (gdeleted || sdeleted)
289 return 0;
290 return psf->sf_count[MCAST_INCLUDE] != 0;
291 case IGMPV3_CHANGE_TO_EXCLUDE:
292 if (gdeleted || sdeleted)
293 return 0;
294 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
295 psf->sf_count[MCAST_INCLUDE])
296 return 0;
297 return pmc->sfcount[MCAST_EXCLUDE] ==
298 psf->sf_count[MCAST_EXCLUDE];
299 case IGMPV3_ALLOW_NEW_SOURCES:
300 if (gdeleted || !psf->sf_crcount)
301 return 0;
302 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
303 case IGMPV3_BLOCK_OLD_SOURCES:
304 if (pmc->sfmode == MCAST_INCLUDE)
305 return gdeleted || (psf->sf_crcount && sdeleted);
306 return psf->sf_crcount && !gdeleted && !sdeleted;
307 }
308 return 0;
309}
310
311static int
312igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
313{
314 struct ip_sf_list *psf;
315 int scount = 0;
316
317 for (psf = pmc->sources; psf; psf = psf->sf_next) {
318 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
319 continue;
320 scount++;
321 }
322 return scount;
323}
324
325/* source address selection per RFC 3376 section 4.2.13 */
326static __be32 igmpv3_get_srcaddr(struct net_device *dev,
327 const struct flowi4 *fl4)
328{
329 struct in_device *in_dev = __in_dev_get_rcu(dev);
330
331 if (!in_dev)
332 return htonl(INADDR_ANY);
333
334 for_ifa(in_dev) {
335 if (fl4->saddr == ifa->ifa_local)
336 return fl4->saddr;
337 } endfor_ifa(in_dev);
338
339 return htonl(INADDR_ANY);
340}
341
342static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
343{
344 struct sk_buff *skb;
345 struct rtable *rt;
346 struct iphdr *pip;
347 struct igmpv3_report *pig;
348 struct net *net = dev_net(dev);
349 struct flowi4 fl4;
350 int hlen = LL_RESERVED_SPACE(dev);
351 int tlen = dev->needed_tailroom;
352 unsigned int size = mtu;
353
354 while (1) {
355 skb = alloc_skb(size + hlen + tlen,
356 GFP_ATOMIC | __GFP_NOWARN);
357 if (skb)
358 break;
359 size >>= 1;
360 if (size < 256)
361 return NULL;
362 }
363 skb->priority = TC_PRIO_CONTROL;
364
365 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
366 0, 0,
367 IPPROTO_IGMP, 0, dev->ifindex);
368 if (IS_ERR(rt)) {
369 kfree_skb(skb);
370 return NULL;
371 }
372
373 skb_dst_set(skb, &rt->dst);
374 skb->dev = dev;
375
376 skb_reserve(skb, hlen);
377 skb_tailroom_reserve(skb, mtu, tlen);
378
379 skb_reset_network_header(skb);
380 pip = ip_hdr(skb);
381 skb_put(skb, sizeof(struct iphdr) + 4);
382
383 pip->version = 4;
384 pip->ihl = (sizeof(struct iphdr)+4)>>2;
385 pip->tos = 0xc0;
386 pip->frag_off = htons(IP_DF);
387 pip->ttl = 1;
388 pip->daddr = fl4.daddr;
389
390 rcu_read_lock();
391 pip->saddr = igmpv3_get_srcaddr(dev, &fl4);
392 rcu_read_unlock();
393
394 pip->protocol = IPPROTO_IGMP;
395 pip->tot_len = 0; /* filled in later */
396 ip_select_ident(net, skb, NULL);
397 ((u8 *)&pip[1])[0] = IPOPT_RA;
398 ((u8 *)&pip[1])[1] = 4;
399 ((u8 *)&pip[1])[2] = 0;
400 ((u8 *)&pip[1])[3] = 0;
401
402 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
403 skb_put(skb, sizeof(*pig));
404 pig = igmpv3_report_hdr(skb);
405 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
406 pig->resv1 = 0;
407 pig->csum = 0;
408 pig->resv2 = 0;
409 pig->ngrec = 0;
410 return skb;
411}
412
413static int igmpv3_sendpack(struct sk_buff *skb)
414{
415 struct igmphdr *pig = igmp_hdr(skb);
416 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
417
418 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
419
420 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
421}
422
423static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
424{
425 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
426}
427
428static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
429 int type, struct igmpv3_grec **ppgr, unsigned int mtu)
430{
431 struct net_device *dev = pmc->interface->dev;
432 struct igmpv3_report *pih;
433 struct igmpv3_grec *pgr;
434
435 if (!skb) {
436 skb = igmpv3_newpack(dev, mtu);
437 if (!skb)
438 return NULL;
439 }
440 pgr = skb_put(skb, sizeof(struct igmpv3_grec));
441 pgr->grec_type = type;
442 pgr->grec_auxwords = 0;
443 pgr->grec_nsrcs = 0;
444 pgr->grec_mca = pmc->multiaddr;
445 pih = igmpv3_report_hdr(skb);
446 pih->ngrec = htons(ntohs(pih->ngrec)+1);
447 *ppgr = pgr;
448 return skb;
449}
450
451#define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
452
453static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
454 int type, int gdeleted, int sdeleted)
455{
456 struct net_device *dev = pmc->interface->dev;
457 struct net *net = dev_net(dev);
458 struct igmpv3_report *pih;
459 struct igmpv3_grec *pgr = NULL;
460 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
461 int scount, stotal, first, isquery, truncate;
462 unsigned int mtu;
463
464 if (pmc->multiaddr == IGMP_ALL_HOSTS)
465 return skb;
466 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
467 return skb;
468
469 mtu = READ_ONCE(dev->mtu);
470 if (mtu < IPV4_MIN_MTU)
471 return skb;
472
473 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
474 type == IGMPV3_MODE_IS_EXCLUDE;
475 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
476 type == IGMPV3_CHANGE_TO_EXCLUDE;
477
478 stotal = scount = 0;
479
480 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
481
482 if (!*psf_list)
483 goto empty_source;
484
485 pih = skb ? igmpv3_report_hdr(skb) : NULL;
486
487 /* EX and TO_EX get a fresh packet, if needed */
488 if (truncate) {
489 if (pih && pih->ngrec &&
490 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
491 if (skb)
492 igmpv3_sendpack(skb);
493 skb = igmpv3_newpack(dev, mtu);
494 }
495 }
496 first = 1;
497 psf_prev = NULL;
498 for (psf = *psf_list; psf; psf = psf_next) {
499 __be32 *psrc;
500
501 psf_next = psf->sf_next;
502
503 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
504 psf_prev = psf;
505 continue;
506 }
507
508 /* Based on RFC3376 5.1. Should not send source-list change
509 * records when there is a filter mode change.
510 */
511 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
512 (!gdeleted && pmc->crcount)) &&
513 (type == IGMPV3_ALLOW_NEW_SOURCES ||
514 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
515 goto decrease_sf_crcount;
516
517 /* clear marks on query responses */
518 if (isquery)
519 psf->sf_gsresp = 0;
520
521 if (AVAILABLE(skb) < sizeof(__be32) +
522 first*sizeof(struct igmpv3_grec)) {
523 if (truncate && !first)
524 break; /* truncate these */
525 if (pgr)
526 pgr->grec_nsrcs = htons(scount);
527 if (skb)
528 igmpv3_sendpack(skb);
529 skb = igmpv3_newpack(dev, mtu);
530 first = 1;
531 scount = 0;
532 }
533 if (first) {
534 skb = add_grhead(skb, pmc, type, &pgr, mtu);
535 first = 0;
536 }
537 if (!skb)
538 return NULL;
539 psrc = skb_put(skb, sizeof(__be32));
540 *psrc = psf->sf_inaddr;
541 scount++; stotal++;
542 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
543 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
544decrease_sf_crcount:
545 psf->sf_crcount--;
546 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
547 if (psf_prev)
548 psf_prev->sf_next = psf->sf_next;
549 else
550 *psf_list = psf->sf_next;
551 kfree(psf);
552 continue;
553 }
554 }
555 psf_prev = psf;
556 }
557
558empty_source:
559 if (!stotal) {
560 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
561 type == IGMPV3_BLOCK_OLD_SOURCES)
562 return skb;
563 if (pmc->crcount || isquery) {
564 /* make sure we have room for group header */
565 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
566 igmpv3_sendpack(skb);
567 skb = NULL; /* add_grhead will get a new one */
568 }
569 skb = add_grhead(skb, pmc, type, &pgr, mtu);
570 }
571 }
572 if (pgr)
573 pgr->grec_nsrcs = htons(scount);
574
575 if (isquery)
576 pmc->gsquery = 0; /* clear query state on report */
577 return skb;
578}
579
580static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
581{
582 struct sk_buff *skb = NULL;
583 struct net *net = dev_net(in_dev->dev);
584 int type;
585
586 if (!pmc) {
587 rcu_read_lock();
588 for_each_pmc_rcu(in_dev, pmc) {
589 if (pmc->multiaddr == IGMP_ALL_HOSTS)
590 continue;
591 if (ipv4_is_local_multicast(pmc->multiaddr) &&
592 !net->ipv4.sysctl_igmp_llm_reports)
593 continue;
594 spin_lock_bh(&pmc->lock);
595 if (pmc->sfcount[MCAST_EXCLUDE])
596 type = IGMPV3_MODE_IS_EXCLUDE;
597 else
598 type = IGMPV3_MODE_IS_INCLUDE;
599 skb = add_grec(skb, pmc, type, 0, 0);
600 spin_unlock_bh(&pmc->lock);
601 }
602 rcu_read_unlock();
603 } else {
604 spin_lock_bh(&pmc->lock);
605 if (pmc->sfcount[MCAST_EXCLUDE])
606 type = IGMPV3_MODE_IS_EXCLUDE;
607 else
608 type = IGMPV3_MODE_IS_INCLUDE;
609 skb = add_grec(skb, pmc, type, 0, 0);
610 spin_unlock_bh(&pmc->lock);
611 }
612 if (!skb)
613 return 0;
614 return igmpv3_sendpack(skb);
615}
616
617/*
618 * remove zero-count source records from a source filter list
619 */
620static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
621{
622 struct ip_sf_list *psf_prev, *psf_next, *psf;
623
624 psf_prev = NULL;
625 for (psf = *ppsf; psf; psf = psf_next) {
626 psf_next = psf->sf_next;
627 if (psf->sf_crcount == 0) {
628 if (psf_prev)
629 psf_prev->sf_next = psf->sf_next;
630 else
631 *ppsf = psf->sf_next;
632 kfree(psf);
633 } else
634 psf_prev = psf;
635 }
636}
637
638static void igmpv3_send_cr(struct in_device *in_dev)
639{
640 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
641 struct sk_buff *skb = NULL;
642 int type, dtype;
643
644 rcu_read_lock();
645 spin_lock_bh(&in_dev->mc_tomb_lock);
646
647 /* deleted MCA's */
648 pmc_prev = NULL;
649 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
650 pmc_next = pmc->next;
651 if (pmc->sfmode == MCAST_INCLUDE) {
652 type = IGMPV3_BLOCK_OLD_SOURCES;
653 dtype = IGMPV3_BLOCK_OLD_SOURCES;
654 skb = add_grec(skb, pmc, type, 1, 0);
655 skb = add_grec(skb, pmc, dtype, 1, 1);
656 }
657 if (pmc->crcount) {
658 if (pmc->sfmode == MCAST_EXCLUDE) {
659 type = IGMPV3_CHANGE_TO_INCLUDE;
660 skb = add_grec(skb, pmc, type, 1, 0);
661 }
662 pmc->crcount--;
663 if (pmc->crcount == 0) {
664 igmpv3_clear_zeros(&pmc->tomb);
665 igmpv3_clear_zeros(&pmc->sources);
666 }
667 }
668 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
669 if (pmc_prev)
670 pmc_prev->next = pmc_next;
671 else
672 in_dev->mc_tomb = pmc_next;
673 in_dev_put(pmc->interface);
674 kfree(pmc);
675 } else
676 pmc_prev = pmc;
677 }
678 spin_unlock_bh(&in_dev->mc_tomb_lock);
679
680 /* change recs */
681 for_each_pmc_rcu(in_dev, pmc) {
682 spin_lock_bh(&pmc->lock);
683 if (pmc->sfcount[MCAST_EXCLUDE]) {
684 type = IGMPV3_BLOCK_OLD_SOURCES;
685 dtype = IGMPV3_ALLOW_NEW_SOURCES;
686 } else {
687 type = IGMPV3_ALLOW_NEW_SOURCES;
688 dtype = IGMPV3_BLOCK_OLD_SOURCES;
689 }
690 skb = add_grec(skb, pmc, type, 0, 0);
691 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
692
693 /* filter mode changes */
694 if (pmc->crcount) {
695 if (pmc->sfmode == MCAST_EXCLUDE)
696 type = IGMPV3_CHANGE_TO_EXCLUDE;
697 else
698 type = IGMPV3_CHANGE_TO_INCLUDE;
699 skb = add_grec(skb, pmc, type, 0, 0);
700 pmc->crcount--;
701 }
702 spin_unlock_bh(&pmc->lock);
703 }
704 rcu_read_unlock();
705
706 if (!skb)
707 return;
708 (void) igmpv3_sendpack(skb);
709}
710
711static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
712 int type)
713{
714 struct sk_buff *skb;
715 struct iphdr *iph;
716 struct igmphdr *ih;
717 struct rtable *rt;
718 struct net_device *dev = in_dev->dev;
719 struct net *net = dev_net(dev);
720 __be32 group = pmc ? pmc->multiaddr : 0;
721 struct flowi4 fl4;
722 __be32 dst;
723 int hlen, tlen;
724
725 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
726 return igmpv3_send_report(in_dev, pmc);
727
728 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
729 return 0;
730
731 if (type == IGMP_HOST_LEAVE_MESSAGE)
732 dst = IGMP_ALL_ROUTER;
733 else
734 dst = group;
735
736 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
737 0, 0,
738 IPPROTO_IGMP, 0, dev->ifindex);
739 if (IS_ERR(rt))
740 return -1;
741
742 hlen = LL_RESERVED_SPACE(dev);
743 tlen = dev->needed_tailroom;
744 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
745 if (!skb) {
746 ip_rt_put(rt);
747 return -1;
748 }
749 skb->priority = TC_PRIO_CONTROL;
750
751 skb_dst_set(skb, &rt->dst);
752
753 skb_reserve(skb, hlen);
754
755 skb_reset_network_header(skb);
756 iph = ip_hdr(skb);
757 skb_put(skb, sizeof(struct iphdr) + 4);
758
759 iph->version = 4;
760 iph->ihl = (sizeof(struct iphdr)+4)>>2;
761 iph->tos = 0xc0;
762 iph->frag_off = htons(IP_DF);
763 iph->ttl = 1;
764 iph->daddr = dst;
765 iph->saddr = fl4.saddr;
766 iph->protocol = IPPROTO_IGMP;
767 ip_select_ident(net, skb, NULL);
768 ((u8 *)&iph[1])[0] = IPOPT_RA;
769 ((u8 *)&iph[1])[1] = 4;
770 ((u8 *)&iph[1])[2] = 0;
771 ((u8 *)&iph[1])[3] = 0;
772
773 ih = skb_put(skb, sizeof(struct igmphdr));
774 ih->type = type;
775 ih->code = 0;
776 ih->csum = 0;
777 ih->group = group;
778 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
779
780 return ip_local_out(net, skb->sk, skb);
781}
782
783static void igmp_gq_timer_expire(struct timer_list *t)
784{
785 struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer);
786
787 in_dev->mr_gq_running = 0;
788 igmpv3_send_report(in_dev, NULL);
789 in_dev_put(in_dev);
790}
791
792static void igmp_ifc_timer_expire(struct timer_list *t)
793{
794 struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer);
795
796 igmpv3_send_cr(in_dev);
797 if (in_dev->mr_ifc_count) {
798 in_dev->mr_ifc_count--;
799 igmp_ifc_start_timer(in_dev,
800 unsolicited_report_interval(in_dev));
801 }
802 in_dev_put(in_dev);
803}
804
805static void igmp_ifc_event(struct in_device *in_dev)
806{
807 struct net *net = dev_net(in_dev->dev);
808 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
809 return;
810 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
811 igmp_ifc_start_timer(in_dev, 1);
812}
813
814
815static void igmp_timer_expire(struct timer_list *t)
816{
817 struct ip_mc_list *im = from_timer(im, t, timer);
818 struct in_device *in_dev = im->interface;
819
820 spin_lock(&im->lock);
821 im->tm_running = 0;
822
823 if (im->unsolicit_count) {
824 im->unsolicit_count--;
825 igmp_start_timer(im, unsolicited_report_interval(in_dev));
826 }
827 im->reporter = 1;
828 spin_unlock(&im->lock);
829
830 if (IGMP_V1_SEEN(in_dev))
831 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
832 else if (IGMP_V2_SEEN(in_dev))
833 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
834 else
835 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
836
837 ip_ma_put(im);
838}
839
840/* mark EXCLUDE-mode sources */
841static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
842{
843 struct ip_sf_list *psf;
844 int i, scount;
845
846 scount = 0;
847 for (psf = pmc->sources; psf; psf = psf->sf_next) {
848 if (scount == nsrcs)
849 break;
850 for (i = 0; i < nsrcs; i++) {
851 /* skip inactive filters */
852 if (psf->sf_count[MCAST_INCLUDE] ||
853 pmc->sfcount[MCAST_EXCLUDE] !=
854 psf->sf_count[MCAST_EXCLUDE])
855 break;
856 if (srcs[i] == psf->sf_inaddr) {
857 scount++;
858 break;
859 }
860 }
861 }
862 pmc->gsquery = 0;
863 if (scount == nsrcs) /* all sources excluded */
864 return 0;
865 return 1;
866}
867
868static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
869{
870 struct ip_sf_list *psf;
871 int i, scount;
872
873 if (pmc->sfmode == MCAST_EXCLUDE)
874 return igmp_xmarksources(pmc, nsrcs, srcs);
875
876 /* mark INCLUDE-mode sources */
877 scount = 0;
878 for (psf = pmc->sources; psf; psf = psf->sf_next) {
879 if (scount == nsrcs)
880 break;
881 for (i = 0; i < nsrcs; i++)
882 if (srcs[i] == psf->sf_inaddr) {
883 psf->sf_gsresp = 1;
884 scount++;
885 break;
886 }
887 }
888 if (!scount) {
889 pmc->gsquery = 0;
890 return 0;
891 }
892 pmc->gsquery = 1;
893 return 1;
894}
895
896/* return true if packet was dropped */
897static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
898{
899 struct ip_mc_list *im;
900 struct net *net = dev_net(in_dev->dev);
901
902 /* Timers are only set for non-local groups */
903
904 if (group == IGMP_ALL_HOSTS)
905 return false;
906 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
907 return false;
908
909 rcu_read_lock();
910 for_each_pmc_rcu(in_dev, im) {
911 if (im->multiaddr == group) {
912 igmp_stop_timer(im);
913 break;
914 }
915 }
916 rcu_read_unlock();
917 return false;
918}
919
920/* return true if packet was dropped */
921static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
922 int len)
923{
924 struct igmphdr *ih = igmp_hdr(skb);
925 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
926 struct ip_mc_list *im;
927 __be32 group = ih->group;
928 int max_delay;
929 int mark = 0;
930 struct net *net = dev_net(in_dev->dev);
931
932
933 if (len == 8) {
934 if (ih->code == 0) {
935 /* Alas, old v1 router presents here. */
936
937 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
938 in_dev->mr_v1_seen = jiffies +
939 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
940 group = 0;
941 } else {
942 /* v2 router present */
943 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
944 in_dev->mr_v2_seen = jiffies +
945 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
946 }
947 /* cancel the interface change timer */
948 in_dev->mr_ifc_count = 0;
949 if (del_timer(&in_dev->mr_ifc_timer))
950 __in_dev_put(in_dev);
951 /* clear deleted report items */
952 igmpv3_clear_delrec(in_dev);
953 } else if (len < 12) {
954 return true; /* ignore bogus packet; freed by caller */
955 } else if (IGMP_V1_SEEN(in_dev)) {
956 /* This is a v3 query with v1 queriers present */
957 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
958 group = 0;
959 } else if (IGMP_V2_SEEN(in_dev)) {
960 /* this is a v3 query with v2 queriers present;
961 * Interpretation of the max_delay code is problematic here.
962 * A real v2 host would use ih_code directly, while v3 has a
963 * different encoding. We use the v3 encoding as more likely
964 * to be intended in a v3 query.
965 */
966 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
967 if (!max_delay)
968 max_delay = 1; /* can't mod w/ 0 */
969 } else { /* v3 */
970 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
971 return true;
972
973 ih3 = igmpv3_query_hdr(skb);
974 if (ih3->nsrcs) {
975 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
976 + ntohs(ih3->nsrcs)*sizeof(__be32)))
977 return true;
978 ih3 = igmpv3_query_hdr(skb);
979 }
980
981 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
982 if (!max_delay)
983 max_delay = 1; /* can't mod w/ 0 */
984 in_dev->mr_maxdelay = max_delay;
985 if (ih3->qrv)
986 in_dev->mr_qrv = ih3->qrv;
987 if (!group) { /* general query */
988 if (ih3->nsrcs)
989 return true; /* no sources allowed */
990 igmp_gq_start_timer(in_dev);
991 return false;
992 }
993 /* mark sources to include, if group & source-specific */
994 mark = ih3->nsrcs != 0;
995 }
996
997 /*
998 * - Start the timers in all of our membership records
999 * that the query applies to for the interface on
1000 * which the query arrived excl. those that belong
1001 * to a "local" group (224.0.0.X)
1002 * - For timers already running check if they need to
1003 * be reset.
1004 * - Use the igmp->igmp_code field as the maximum
1005 * delay possible
1006 */
1007 rcu_read_lock();
1008 for_each_pmc_rcu(in_dev, im) {
1009 int changed;
1010
1011 if (group && group != im->multiaddr)
1012 continue;
1013 if (im->multiaddr == IGMP_ALL_HOSTS)
1014 continue;
1015 if (ipv4_is_local_multicast(im->multiaddr) &&
1016 !net->ipv4.sysctl_igmp_llm_reports)
1017 continue;
1018 spin_lock_bh(&im->lock);
1019 if (im->tm_running)
1020 im->gsquery = im->gsquery && mark;
1021 else
1022 im->gsquery = mark;
1023 changed = !im->gsquery ||
1024 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1025 spin_unlock_bh(&im->lock);
1026 if (changed)
1027 igmp_mod_timer(im, max_delay);
1028 }
1029 rcu_read_unlock();
1030 return false;
1031}
1032
1033/* called in rcu_read_lock() section */
1034int igmp_rcv(struct sk_buff *skb)
1035{
1036 /* This basically follows the spec line by line -- see RFC1112 */
1037 struct igmphdr *ih;
1038 struct net_device *dev = skb->dev;
1039 struct in_device *in_dev;
1040 int len = skb->len;
1041 bool dropped = true;
1042
1043 if (netif_is_l3_master(dev)) {
1044 dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif);
1045 if (!dev)
1046 goto drop;
1047 }
1048
1049 in_dev = __in_dev_get_rcu(dev);
1050 if (!in_dev)
1051 goto drop;
1052
1053 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1054 goto drop;
1055
1056 if (skb_checksum_simple_validate(skb))
1057 goto drop;
1058
1059 ih = igmp_hdr(skb);
1060 switch (ih->type) {
1061 case IGMP_HOST_MEMBERSHIP_QUERY:
1062 dropped = igmp_heard_query(in_dev, skb, len);
1063 break;
1064 case IGMP_HOST_MEMBERSHIP_REPORT:
1065 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1066 /* Is it our report looped back? */
1067 if (rt_is_output_route(skb_rtable(skb)))
1068 break;
1069 /* don't rely on MC router hearing unicast reports */
1070 if (skb->pkt_type == PACKET_MULTICAST ||
1071 skb->pkt_type == PACKET_BROADCAST)
1072 dropped = igmp_heard_report(in_dev, ih->group);
1073 break;
1074 case IGMP_PIM:
1075#ifdef CONFIG_IP_PIMSM_V1
1076 return pim_rcv_v1(skb);
1077#endif
1078 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1079 case IGMP_DVMRP:
1080 case IGMP_TRACE:
1081 case IGMP_HOST_LEAVE_MESSAGE:
1082 case IGMP_MTRACE:
1083 case IGMP_MTRACE_RESP:
1084 break;
1085 default:
1086 break;
1087 }
1088
1089drop:
1090 if (dropped)
1091 kfree_skb(skb);
1092 else
1093 consume_skb(skb);
1094 return 0;
1095}
1096
1097#endif
1098
1099
1100/*
1101 * Add a filter to a device
1102 */
1103
1104static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1105{
1106 char buf[MAX_ADDR_LEN];
1107 struct net_device *dev = in_dev->dev;
1108
1109 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1110 We will get multicast token leakage, when IFF_MULTICAST
1111 is changed. This check should be done in ndo_set_rx_mode
1112 routine. Something sort of:
1113 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1114 --ANK
1115 */
1116 if (arp_mc_map(addr, buf, dev, 0) == 0)
1117 dev_mc_add(dev, buf);
1118}
1119
1120/*
1121 * Remove a filter from a device
1122 */
1123
1124static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1125{
1126 char buf[MAX_ADDR_LEN];
1127 struct net_device *dev = in_dev->dev;
1128
1129 if (arp_mc_map(addr, buf, dev, 0) == 0)
1130 dev_mc_del(dev, buf);
1131}
1132
1133#ifdef CONFIG_IP_MULTICAST
1134/*
1135 * deleted ip_mc_list manipulation
1136 */
1137static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1138{
1139 struct ip_mc_list *pmc;
1140 struct net *net = dev_net(in_dev->dev);
1141
1142 /* this is an "ip_mc_list" for convenience; only the fields below
1143 * are actually used. In particular, the refcnt and users are not
1144 * used for management of the delete list. Using the same structure
1145 * for deleted items allows change reports to use common code with
1146 * non-deleted or query-response MCA's.
1147 */
1148 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1149 if (!pmc)
1150 return;
1151 spin_lock_init(&pmc->lock);
1152 spin_lock_bh(&im->lock);
1153 pmc->interface = im->interface;
1154 in_dev_hold(in_dev);
1155 pmc->multiaddr = im->multiaddr;
1156 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1157 pmc->sfmode = im->sfmode;
1158 if (pmc->sfmode == MCAST_INCLUDE) {
1159 struct ip_sf_list *psf;
1160
1161 pmc->tomb = im->tomb;
1162 pmc->sources = im->sources;
1163 im->tomb = im->sources = NULL;
1164 for (psf = pmc->sources; psf; psf = psf->sf_next)
1165 psf->sf_crcount = pmc->crcount;
1166 }
1167 spin_unlock_bh(&im->lock);
1168
1169 spin_lock_bh(&in_dev->mc_tomb_lock);
1170 pmc->next = in_dev->mc_tomb;
1171 in_dev->mc_tomb = pmc;
1172 spin_unlock_bh(&in_dev->mc_tomb_lock);
1173}
1174
1175/*
1176 * restore ip_mc_list deleted records
1177 */
1178static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1179{
1180 struct ip_mc_list *pmc, *pmc_prev;
1181 struct ip_sf_list *psf;
1182 struct net *net = dev_net(in_dev->dev);
1183 __be32 multiaddr = im->multiaddr;
1184
1185 spin_lock_bh(&in_dev->mc_tomb_lock);
1186 pmc_prev = NULL;
1187 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1188 if (pmc->multiaddr == multiaddr)
1189 break;
1190 pmc_prev = pmc;
1191 }
1192 if (pmc) {
1193 if (pmc_prev)
1194 pmc_prev->next = pmc->next;
1195 else
1196 in_dev->mc_tomb = pmc->next;
1197 }
1198 spin_unlock_bh(&in_dev->mc_tomb_lock);
1199
1200 spin_lock_bh(&im->lock);
1201 if (pmc) {
1202 im->interface = pmc->interface;
1203 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1204 im->sfmode = pmc->sfmode;
1205 if (pmc->sfmode == MCAST_INCLUDE) {
1206 im->tomb = pmc->tomb;
1207 im->sources = pmc->sources;
1208 for (psf = im->sources; psf; psf = psf->sf_next)
1209 psf->sf_crcount = im->crcount;
1210 }
1211 in_dev_put(pmc->interface);
1212 kfree(pmc);
1213 }
1214 spin_unlock_bh(&im->lock);
1215}
1216
1217/*
1218 * flush ip_mc_list deleted records
1219 */
1220static void igmpv3_clear_delrec(struct in_device *in_dev)
1221{
1222 struct ip_mc_list *pmc, *nextpmc;
1223
1224 spin_lock_bh(&in_dev->mc_tomb_lock);
1225 pmc = in_dev->mc_tomb;
1226 in_dev->mc_tomb = NULL;
1227 spin_unlock_bh(&in_dev->mc_tomb_lock);
1228
1229 for (; pmc; pmc = nextpmc) {
1230 nextpmc = pmc->next;
1231 ip_mc_clear_src(pmc);
1232 in_dev_put(pmc->interface);
1233 kfree(pmc);
1234 }
1235 /* clear dead sources, too */
1236 rcu_read_lock();
1237 for_each_pmc_rcu(in_dev, pmc) {
1238 struct ip_sf_list *psf, *psf_next;
1239
1240 spin_lock_bh(&pmc->lock);
1241 psf = pmc->tomb;
1242 pmc->tomb = NULL;
1243 spin_unlock_bh(&pmc->lock);
1244 for (; psf; psf = psf_next) {
1245 psf_next = psf->sf_next;
1246 kfree(psf);
1247 }
1248 }
1249 rcu_read_unlock();
1250}
1251#endif
1252
1253static void igmp_group_dropped(struct ip_mc_list *im)
1254{
1255 struct in_device *in_dev = im->interface;
1256#ifdef CONFIG_IP_MULTICAST
1257 struct net *net = dev_net(in_dev->dev);
1258 int reporter;
1259#endif
1260
1261 if (im->loaded) {
1262 im->loaded = 0;
1263 ip_mc_filter_del(in_dev, im->multiaddr);
1264 }
1265
1266#ifdef CONFIG_IP_MULTICAST
1267 if (im->multiaddr == IGMP_ALL_HOSTS)
1268 return;
1269 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1270 return;
1271
1272 reporter = im->reporter;
1273 igmp_stop_timer(im);
1274
1275 if (!in_dev->dead) {
1276 if (IGMP_V1_SEEN(in_dev))
1277 return;
1278 if (IGMP_V2_SEEN(in_dev)) {
1279 if (reporter)
1280 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1281 return;
1282 }
1283 /* IGMPv3 */
1284 igmpv3_add_delrec(in_dev, im);
1285
1286 igmp_ifc_event(in_dev);
1287 }
1288#endif
1289}
1290
1291static void igmp_group_added(struct ip_mc_list *im)
1292{
1293 struct in_device *in_dev = im->interface;
1294#ifdef CONFIG_IP_MULTICAST
1295 struct net *net = dev_net(in_dev->dev);
1296#endif
1297
1298 if (im->loaded == 0) {
1299 im->loaded = 1;
1300 ip_mc_filter_add(in_dev, im->multiaddr);
1301 }
1302
1303#ifdef CONFIG_IP_MULTICAST
1304 if (im->multiaddr == IGMP_ALL_HOSTS)
1305 return;
1306 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1307 return;
1308
1309 if (in_dev->dead)
1310 return;
1311 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1312 spin_lock_bh(&im->lock);
1313 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1314 spin_unlock_bh(&im->lock);
1315 return;
1316 }
1317 /* else, v3 */
1318
1319 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1320 igmp_ifc_event(in_dev);
1321#endif
1322}
1323
1324
1325/*
1326 * Multicast list managers
1327 */
1328
1329static u32 ip_mc_hash(const struct ip_mc_list *im)
1330{
1331 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1332}
1333
1334static void ip_mc_hash_add(struct in_device *in_dev,
1335 struct ip_mc_list *im)
1336{
1337 struct ip_mc_list __rcu **mc_hash;
1338 u32 hash;
1339
1340 mc_hash = rtnl_dereference(in_dev->mc_hash);
1341 if (mc_hash) {
1342 hash = ip_mc_hash(im);
1343 im->next_hash = mc_hash[hash];
1344 rcu_assign_pointer(mc_hash[hash], im);
1345 return;
1346 }
1347
1348 /* do not use a hash table for small number of items */
1349 if (in_dev->mc_count < 4)
1350 return;
1351
1352 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1353 GFP_KERNEL);
1354 if (!mc_hash)
1355 return;
1356
1357 for_each_pmc_rtnl(in_dev, im) {
1358 hash = ip_mc_hash(im);
1359 im->next_hash = mc_hash[hash];
1360 RCU_INIT_POINTER(mc_hash[hash], im);
1361 }
1362
1363 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1364}
1365
1366static void ip_mc_hash_remove(struct in_device *in_dev,
1367 struct ip_mc_list *im)
1368{
1369 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1370 struct ip_mc_list *aux;
1371
1372 if (!mc_hash)
1373 return;
1374 mc_hash += ip_mc_hash(im);
1375 while ((aux = rtnl_dereference(*mc_hash)) != im)
1376 mc_hash = &aux->next_hash;
1377 *mc_hash = im->next_hash;
1378}
1379
1380
1381/*
1382 * A socket has joined a multicast group on device dev.
1383 */
1384
1385void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1386{
1387 struct ip_mc_list *im;
1388#ifdef CONFIG_IP_MULTICAST
1389 struct net *net = dev_net(in_dev->dev);
1390#endif
1391
1392 ASSERT_RTNL();
1393
1394 for_each_pmc_rtnl(in_dev, im) {
1395 if (im->multiaddr == addr) {
1396 im->users++;
1397 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1398 goto out;
1399 }
1400 }
1401
1402 im = kzalloc(sizeof(*im), GFP_KERNEL);
1403 if (!im)
1404 goto out;
1405
1406 im->users = 1;
1407 im->interface = in_dev;
1408 in_dev_hold(in_dev);
1409 im->multiaddr = addr;
1410 /* initial mode is (EX, empty) */
1411 im->sfmode = MCAST_EXCLUDE;
1412 im->sfcount[MCAST_EXCLUDE] = 1;
1413 refcount_set(&im->refcnt, 1);
1414 spin_lock_init(&im->lock);
1415#ifdef CONFIG_IP_MULTICAST
1416 timer_setup(&im->timer, igmp_timer_expire, 0);
1417 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1418#endif
1419
1420 im->next_rcu = in_dev->mc_list;
1421 in_dev->mc_count++;
1422 rcu_assign_pointer(in_dev->mc_list, im);
1423
1424 ip_mc_hash_add(in_dev, im);
1425
1426#ifdef CONFIG_IP_MULTICAST
1427 igmpv3_del_delrec(in_dev, im);
1428#endif
1429 igmp_group_added(im);
1430 if (!in_dev->dead)
1431 ip_rt_multicast_event(in_dev);
1432out:
1433 return;
1434}
1435EXPORT_SYMBOL(ip_mc_inc_group);
1436
1437static int ip_mc_check_iphdr(struct sk_buff *skb)
1438{
1439 const struct iphdr *iph;
1440 unsigned int len;
1441 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1442
1443 if (!pskb_may_pull(skb, offset))
1444 return -EINVAL;
1445
1446 iph = ip_hdr(skb);
1447
1448 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1449 return -EINVAL;
1450
1451 offset += ip_hdrlen(skb) - sizeof(*iph);
1452
1453 if (!pskb_may_pull(skb, offset))
1454 return -EINVAL;
1455
1456 iph = ip_hdr(skb);
1457
1458 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1459 return -EINVAL;
1460
1461 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1462 if (skb->len < len || len < offset)
1463 return -EINVAL;
1464
1465 skb_set_transport_header(skb, offset);
1466
1467 return 0;
1468}
1469
1470static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1471{
1472 unsigned int len = skb_transport_offset(skb);
1473
1474 len += sizeof(struct igmpv3_report);
1475
1476 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1477}
1478
1479static int ip_mc_check_igmp_query(struct sk_buff *skb)
1480{
1481 unsigned int len = skb_transport_offset(skb);
1482
1483 len += sizeof(struct igmphdr);
1484 if (skb->len < len)
1485 return -EINVAL;
1486
1487 /* IGMPv{1,2}? */
1488 if (skb->len != len) {
1489 /* or IGMPv3? */
1490 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1491 if (skb->len < len || !pskb_may_pull(skb, len))
1492 return -EINVAL;
1493 }
1494
1495 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1496 * all-systems destination addresses (224.0.0.1) for general queries
1497 */
1498 if (!igmp_hdr(skb)->group &&
1499 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1500 return -EINVAL;
1501
1502 return 0;
1503}
1504
1505static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1506{
1507 switch (igmp_hdr(skb)->type) {
1508 case IGMP_HOST_LEAVE_MESSAGE:
1509 case IGMP_HOST_MEMBERSHIP_REPORT:
1510 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1511 /* fall through */
1512 return 0;
1513 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1514 return ip_mc_check_igmp_reportv3(skb);
1515 case IGMP_HOST_MEMBERSHIP_QUERY:
1516 return ip_mc_check_igmp_query(skb);
1517 default:
1518 return -ENOMSG;
1519 }
1520}
1521
1522static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1523{
1524 return skb_checksum_simple_validate(skb);
1525}
1526
1527static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1528
1529{
1530 struct sk_buff *skb_chk;
1531 unsigned int transport_len;
1532 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1533 int ret = -EINVAL;
1534
1535 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1536
1537 skb_chk = skb_checksum_trimmed(skb, transport_len,
1538 ip_mc_validate_checksum);
1539 if (!skb_chk)
1540 goto err;
1541
1542 if (!pskb_may_pull(skb_chk, len))
1543 goto err;
1544
1545 ret = ip_mc_check_igmp_msg(skb_chk);
1546 if (ret)
1547 goto err;
1548
1549 if (skb_trimmed)
1550 *skb_trimmed = skb_chk;
1551 /* free now unneeded clone */
1552 else if (skb_chk != skb)
1553 kfree_skb(skb_chk);
1554
1555 ret = 0;
1556
1557err:
1558 if (ret && skb_chk && skb_chk != skb)
1559 kfree_skb(skb_chk);
1560
1561 return ret;
1562}
1563
1564/**
1565 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1566 * @skb: the skb to validate
1567 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1568 *
1569 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1570 * skb transport header accordingly and returns zero.
1571 *
1572 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1573 * standard
1574 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1575 * -ENOMEM: A memory allocation failure happened.
1576 *
1577 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1578 * to NULL): After parsing an IGMP packet successfully it will point to
1579 * an skb which has its tail aligned to the IP packet end. This might
1580 * either be the originally provided skb or a trimmed, cloned version if
1581 * the skb frame had data beyond the IP packet. A cloned skb allows us
1582 * to leave the original skb and its full frame unchanged (which might be
1583 * desirable for layer 2 frame jugglers).
1584 *
1585 * Caller needs to set the skb network header and free any returned skb if it
1586 * differs from the provided skb.
1587 */
1588int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1589{
1590 int ret = ip_mc_check_iphdr(skb);
1591
1592 if (ret < 0)
1593 return ret;
1594
1595 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1596 return -ENOMSG;
1597
1598 return __ip_mc_check_igmp(skb, skb_trimmed);
1599}
1600EXPORT_SYMBOL(ip_mc_check_igmp);
1601
1602/*
1603 * Resend IGMP JOIN report; used by netdev notifier.
1604 */
1605static void ip_mc_rejoin_groups(struct in_device *in_dev)
1606{
1607#ifdef CONFIG_IP_MULTICAST
1608 struct ip_mc_list *im;
1609 int type;
1610 struct net *net = dev_net(in_dev->dev);
1611
1612 ASSERT_RTNL();
1613
1614 for_each_pmc_rtnl(in_dev, im) {
1615 if (im->multiaddr == IGMP_ALL_HOSTS)
1616 continue;
1617 if (ipv4_is_local_multicast(im->multiaddr) &&
1618 !net->ipv4.sysctl_igmp_llm_reports)
1619 continue;
1620
1621 /* a failover is happening and switches
1622 * must be notified immediately
1623 */
1624 if (IGMP_V1_SEEN(in_dev))
1625 type = IGMP_HOST_MEMBERSHIP_REPORT;
1626 else if (IGMP_V2_SEEN(in_dev))
1627 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1628 else
1629 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1630 igmp_send_report(in_dev, im, type);
1631 }
1632#endif
1633}
1634
1635/*
1636 * A socket has left a multicast group on device dev
1637 */
1638
1639void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1640{
1641 struct ip_mc_list *i;
1642 struct ip_mc_list __rcu **ip;
1643
1644 ASSERT_RTNL();
1645
1646 for (ip = &in_dev->mc_list;
1647 (i = rtnl_dereference(*ip)) != NULL;
1648 ip = &i->next_rcu) {
1649 if (i->multiaddr == addr) {
1650 if (--i->users == 0) {
1651 ip_mc_hash_remove(in_dev, i);
1652 *ip = i->next_rcu;
1653 in_dev->mc_count--;
1654 igmp_group_dropped(i);
1655 ip_mc_clear_src(i);
1656
1657 if (!in_dev->dead)
1658 ip_rt_multicast_event(in_dev);
1659
1660 ip_ma_put(i);
1661 return;
1662 }
1663 break;
1664 }
1665 }
1666}
1667EXPORT_SYMBOL(ip_mc_dec_group);
1668
1669/* Device changing type */
1670
1671void ip_mc_unmap(struct in_device *in_dev)
1672{
1673 struct ip_mc_list *pmc;
1674
1675 ASSERT_RTNL();
1676
1677 for_each_pmc_rtnl(in_dev, pmc)
1678 igmp_group_dropped(pmc);
1679}
1680
1681void ip_mc_remap(struct in_device *in_dev)
1682{
1683 struct ip_mc_list *pmc;
1684
1685 ASSERT_RTNL();
1686
1687 for_each_pmc_rtnl(in_dev, pmc) {
1688#ifdef CONFIG_IP_MULTICAST
1689 igmpv3_del_delrec(in_dev, pmc);
1690#endif
1691 igmp_group_added(pmc);
1692 }
1693}
1694
1695/* Device going down */
1696
1697void ip_mc_down(struct in_device *in_dev)
1698{
1699 struct ip_mc_list *pmc;
1700
1701 ASSERT_RTNL();
1702
1703 for_each_pmc_rtnl(in_dev, pmc)
1704 igmp_group_dropped(pmc);
1705
1706#ifdef CONFIG_IP_MULTICAST
1707 in_dev->mr_ifc_count = 0;
1708 if (del_timer(&in_dev->mr_ifc_timer))
1709 __in_dev_put(in_dev);
1710 in_dev->mr_gq_running = 0;
1711 if (del_timer(&in_dev->mr_gq_timer))
1712 __in_dev_put(in_dev);
1713#endif
1714
1715 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1716}
1717
1718void ip_mc_init_dev(struct in_device *in_dev)
1719{
1720#ifdef CONFIG_IP_MULTICAST
1721 struct net *net = dev_net(in_dev->dev);
1722#endif
1723 ASSERT_RTNL();
1724
1725#ifdef CONFIG_IP_MULTICAST
1726 timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0);
1727 timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0);
1728 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1729#endif
1730
1731 spin_lock_init(&in_dev->mc_tomb_lock);
1732}
1733
1734/* Device going up */
1735
1736void ip_mc_up(struct in_device *in_dev)
1737{
1738 struct ip_mc_list *pmc;
1739#ifdef CONFIG_IP_MULTICAST
1740 struct net *net = dev_net(in_dev->dev);
1741#endif
1742
1743 ASSERT_RTNL();
1744
1745#ifdef CONFIG_IP_MULTICAST
1746 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1747#endif
1748 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1749
1750 for_each_pmc_rtnl(in_dev, pmc) {
1751#ifdef CONFIG_IP_MULTICAST
1752 igmpv3_del_delrec(in_dev, pmc);
1753#endif
1754 igmp_group_added(pmc);
1755 }
1756}
1757
1758/*
1759 * Device is about to be destroyed: clean up.
1760 */
1761
1762void ip_mc_destroy_dev(struct in_device *in_dev)
1763{
1764 struct ip_mc_list *i;
1765
1766 ASSERT_RTNL();
1767
1768 /* Deactivate timers */
1769 ip_mc_down(in_dev);
1770#ifdef CONFIG_IP_MULTICAST
1771 igmpv3_clear_delrec(in_dev);
1772#endif
1773
1774 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1775 in_dev->mc_list = i->next_rcu;
1776 in_dev->mc_count--;
1777 ip_ma_put(i);
1778 }
1779}
1780
1781/* RTNL is locked */
1782static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1783{
1784 struct net_device *dev = NULL;
1785 struct in_device *idev = NULL;
1786
1787 if (imr->imr_ifindex) {
1788 idev = inetdev_by_index(net, imr->imr_ifindex);
1789 return idev;
1790 }
1791 if (imr->imr_address.s_addr) {
1792 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1793 if (!dev)
1794 return NULL;
1795 }
1796
1797 if (!dev) {
1798 struct rtable *rt = ip_route_output(net,
1799 imr->imr_multiaddr.s_addr,
1800 0, 0, 0);
1801 if (!IS_ERR(rt)) {
1802 dev = rt->dst.dev;
1803 ip_rt_put(rt);
1804 }
1805 }
1806 if (dev) {
1807 imr->imr_ifindex = dev->ifindex;
1808 idev = __in_dev_get_rtnl(dev);
1809 }
1810 return idev;
1811}
1812
1813/*
1814 * Join a socket to a group
1815 */
1816
1817static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1818 __be32 *psfsrc)
1819{
1820 struct ip_sf_list *psf, *psf_prev;
1821 int rv = 0;
1822
1823 psf_prev = NULL;
1824 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1825 if (psf->sf_inaddr == *psfsrc)
1826 break;
1827 psf_prev = psf;
1828 }
1829 if (!psf || psf->sf_count[sfmode] == 0) {
1830 /* source filter not found, or count wrong => bug */
1831 return -ESRCH;
1832 }
1833 psf->sf_count[sfmode]--;
1834 if (psf->sf_count[sfmode] == 0) {
1835 ip_rt_multicast_event(pmc->interface);
1836 }
1837 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1838#ifdef CONFIG_IP_MULTICAST
1839 struct in_device *in_dev = pmc->interface;
1840 struct net *net = dev_net(in_dev->dev);
1841#endif
1842
1843 /* no more filters for this source */
1844 if (psf_prev)
1845 psf_prev->sf_next = psf->sf_next;
1846 else
1847 pmc->sources = psf->sf_next;
1848#ifdef CONFIG_IP_MULTICAST
1849 if (psf->sf_oldin &&
1850 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1851 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1852 psf->sf_next = pmc->tomb;
1853 pmc->tomb = psf;
1854 rv = 1;
1855 } else
1856#endif
1857 kfree(psf);
1858 }
1859 return rv;
1860}
1861
1862#ifndef CONFIG_IP_MULTICAST
1863#define igmp_ifc_event(x) do { } while (0)
1864#endif
1865
1866static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1867 int sfcount, __be32 *psfsrc, int delta)
1868{
1869 struct ip_mc_list *pmc;
1870 int changerec = 0;
1871 int i, err;
1872
1873 if (!in_dev)
1874 return -ENODEV;
1875 rcu_read_lock();
1876 for_each_pmc_rcu(in_dev, pmc) {
1877 if (*pmca == pmc->multiaddr)
1878 break;
1879 }
1880 if (!pmc) {
1881 /* MCA not found?? bug */
1882 rcu_read_unlock();
1883 return -ESRCH;
1884 }
1885 spin_lock_bh(&pmc->lock);
1886 rcu_read_unlock();
1887#ifdef CONFIG_IP_MULTICAST
1888 sf_markstate(pmc);
1889#endif
1890 if (!delta) {
1891 err = -EINVAL;
1892 if (!pmc->sfcount[sfmode])
1893 goto out_unlock;
1894 pmc->sfcount[sfmode]--;
1895 }
1896 err = 0;
1897 for (i = 0; i < sfcount; i++) {
1898 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1899
1900 changerec |= rv > 0;
1901 if (!err && rv < 0)
1902 err = rv;
1903 }
1904 if (pmc->sfmode == MCAST_EXCLUDE &&
1905 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1906 pmc->sfcount[MCAST_INCLUDE]) {
1907#ifdef CONFIG_IP_MULTICAST
1908 struct ip_sf_list *psf;
1909 struct net *net = dev_net(in_dev->dev);
1910#endif
1911
1912 /* filter mode change */
1913 pmc->sfmode = MCAST_INCLUDE;
1914#ifdef CONFIG_IP_MULTICAST
1915 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1916 in_dev->mr_ifc_count = pmc->crcount;
1917 for (psf = pmc->sources; psf; psf = psf->sf_next)
1918 psf->sf_crcount = 0;
1919 igmp_ifc_event(pmc->interface);
1920 } else if (sf_setstate(pmc) || changerec) {
1921 igmp_ifc_event(pmc->interface);
1922#endif
1923 }
1924out_unlock:
1925 spin_unlock_bh(&pmc->lock);
1926 return err;
1927}
1928
1929/*
1930 * Add multicast single-source filter to the interface list
1931 */
1932static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1933 __be32 *psfsrc)
1934{
1935 struct ip_sf_list *psf, *psf_prev;
1936
1937 psf_prev = NULL;
1938 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1939 if (psf->sf_inaddr == *psfsrc)
1940 break;
1941 psf_prev = psf;
1942 }
1943 if (!psf) {
1944 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1945 if (!psf)
1946 return -ENOBUFS;
1947 psf->sf_inaddr = *psfsrc;
1948 if (psf_prev) {
1949 psf_prev->sf_next = psf;
1950 } else
1951 pmc->sources = psf;
1952 }
1953 psf->sf_count[sfmode]++;
1954 if (psf->sf_count[sfmode] == 1) {
1955 ip_rt_multicast_event(pmc->interface);
1956 }
1957 return 0;
1958}
1959
1960#ifdef CONFIG_IP_MULTICAST
1961static void sf_markstate(struct ip_mc_list *pmc)
1962{
1963 struct ip_sf_list *psf;
1964 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1965
1966 for (psf = pmc->sources; psf; psf = psf->sf_next)
1967 if (pmc->sfcount[MCAST_EXCLUDE]) {
1968 psf->sf_oldin = mca_xcount ==
1969 psf->sf_count[MCAST_EXCLUDE] &&
1970 !psf->sf_count[MCAST_INCLUDE];
1971 } else
1972 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1973}
1974
1975static int sf_setstate(struct ip_mc_list *pmc)
1976{
1977 struct ip_sf_list *psf, *dpsf;
1978 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1979 int qrv = pmc->interface->mr_qrv;
1980 int new_in, rv;
1981
1982 rv = 0;
1983 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1984 if (pmc->sfcount[MCAST_EXCLUDE]) {
1985 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1986 !psf->sf_count[MCAST_INCLUDE];
1987 } else
1988 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1989 if (new_in) {
1990 if (!psf->sf_oldin) {
1991 struct ip_sf_list *prev = NULL;
1992
1993 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1994 if (dpsf->sf_inaddr == psf->sf_inaddr)
1995 break;
1996 prev = dpsf;
1997 }
1998 if (dpsf) {
1999 if (prev)
2000 prev->sf_next = dpsf->sf_next;
2001 else
2002 pmc->tomb = dpsf->sf_next;
2003 kfree(dpsf);
2004 }
2005 psf->sf_crcount = qrv;
2006 rv++;
2007 }
2008 } else if (psf->sf_oldin) {
2009
2010 psf->sf_crcount = 0;
2011 /*
2012 * add or update "delete" records if an active filter
2013 * is now inactive
2014 */
2015 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
2016 if (dpsf->sf_inaddr == psf->sf_inaddr)
2017 break;
2018 if (!dpsf) {
2019 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2020 if (!dpsf)
2021 continue;
2022 *dpsf = *psf;
2023 /* pmc->lock held by callers */
2024 dpsf->sf_next = pmc->tomb;
2025 pmc->tomb = dpsf;
2026 }
2027 dpsf->sf_crcount = qrv;
2028 rv++;
2029 }
2030 }
2031 return rv;
2032}
2033#endif
2034
2035/*
2036 * Add multicast source filter list to the interface list
2037 */
2038static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2039 int sfcount, __be32 *psfsrc, int delta)
2040{
2041 struct ip_mc_list *pmc;
2042 int isexclude;
2043 int i, err;
2044
2045 if (!in_dev)
2046 return -ENODEV;
2047 rcu_read_lock();
2048 for_each_pmc_rcu(in_dev, pmc) {
2049 if (*pmca == pmc->multiaddr)
2050 break;
2051 }
2052 if (!pmc) {
2053 /* MCA not found?? bug */
2054 rcu_read_unlock();
2055 return -ESRCH;
2056 }
2057 spin_lock_bh(&pmc->lock);
2058 rcu_read_unlock();
2059
2060#ifdef CONFIG_IP_MULTICAST
2061 sf_markstate(pmc);
2062#endif
2063 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2064 if (!delta)
2065 pmc->sfcount[sfmode]++;
2066 err = 0;
2067 for (i = 0; i < sfcount; i++) {
2068 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2069 if (err)
2070 break;
2071 }
2072 if (err) {
2073 int j;
2074
2075 if (!delta)
2076 pmc->sfcount[sfmode]--;
2077 for (j = 0; j < i; j++)
2078 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2079 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2080#ifdef CONFIG_IP_MULTICAST
2081 struct ip_sf_list *psf;
2082 struct net *net = dev_net(pmc->interface->dev);
2083 in_dev = pmc->interface;
2084#endif
2085
2086 /* filter mode change */
2087 if (pmc->sfcount[MCAST_EXCLUDE])
2088 pmc->sfmode = MCAST_EXCLUDE;
2089 else if (pmc->sfcount[MCAST_INCLUDE])
2090 pmc->sfmode = MCAST_INCLUDE;
2091#ifdef CONFIG_IP_MULTICAST
2092 /* else no filters; keep old mode for reports */
2093
2094 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2095 in_dev->mr_ifc_count = pmc->crcount;
2096 for (psf = pmc->sources; psf; psf = psf->sf_next)
2097 psf->sf_crcount = 0;
2098 igmp_ifc_event(in_dev);
2099 } else if (sf_setstate(pmc)) {
2100 igmp_ifc_event(in_dev);
2101#endif
2102 }
2103 spin_unlock_bh(&pmc->lock);
2104 return err;
2105}
2106
2107static void ip_mc_clear_src(struct ip_mc_list *pmc)
2108{
2109 struct ip_sf_list *psf, *nextpsf, *tomb, *sources;
2110
2111 spin_lock_bh(&pmc->lock);
2112 tomb = pmc->tomb;
2113 pmc->tomb = NULL;
2114 sources = pmc->sources;
2115 pmc->sources = NULL;
2116 pmc->sfmode = MCAST_EXCLUDE;
2117 pmc->sfcount[MCAST_INCLUDE] = 0;
2118 pmc->sfcount[MCAST_EXCLUDE] = 1;
2119 spin_unlock_bh(&pmc->lock);
2120
2121 for (psf = tomb; psf; psf = nextpsf) {
2122 nextpsf = psf->sf_next;
2123 kfree(psf);
2124 }
2125 for (psf = sources; psf; psf = nextpsf) {
2126 nextpsf = psf->sf_next;
2127 kfree(psf);
2128 }
2129}
2130
2131/* Join a multicast group
2132 */
2133
2134int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2135{
2136 __be32 addr = imr->imr_multiaddr.s_addr;
2137 struct ip_mc_socklist *iml, *i;
2138 struct in_device *in_dev;
2139 struct inet_sock *inet = inet_sk(sk);
2140 struct net *net = sock_net(sk);
2141 int ifindex;
2142 int count = 0;
2143 int err;
2144
2145 ASSERT_RTNL();
2146
2147 if (!ipv4_is_multicast(addr))
2148 return -EINVAL;
2149
2150 in_dev = ip_mc_find_dev(net, imr);
2151
2152 if (!in_dev) {
2153 err = -ENODEV;
2154 goto done;
2155 }
2156
2157 err = -EADDRINUSE;
2158 ifindex = imr->imr_ifindex;
2159 for_each_pmc_rtnl(inet, i) {
2160 if (i->multi.imr_multiaddr.s_addr == addr &&
2161 i->multi.imr_ifindex == ifindex)
2162 goto done;
2163 count++;
2164 }
2165 err = -ENOBUFS;
2166 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2167 goto done;
2168 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2169 if (!iml)
2170 goto done;
2171
2172 memcpy(&iml->multi, imr, sizeof(*imr));
2173 iml->next_rcu = inet->mc_list;
2174 iml->sflist = NULL;
2175 iml->sfmode = MCAST_EXCLUDE;
2176 rcu_assign_pointer(inet->mc_list, iml);
2177 ip_mc_inc_group(in_dev, addr);
2178 err = 0;
2179done:
2180 return err;
2181}
2182EXPORT_SYMBOL(ip_mc_join_group);
2183
2184static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2185 struct in_device *in_dev)
2186{
2187 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2188 int err;
2189
2190 if (!psf) {
2191 /* any-source empty exclude case */
2192 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2193 iml->sfmode, 0, NULL, 0);
2194 }
2195 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2196 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2197 RCU_INIT_POINTER(iml->sflist, NULL);
2198 /* decrease mem now to avoid the memleak warning */
2199 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2200 kfree_rcu(psf, rcu);
2201 return err;
2202}
2203
2204int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2205{
2206 struct inet_sock *inet = inet_sk(sk);
2207 struct ip_mc_socklist *iml;
2208 struct ip_mc_socklist __rcu **imlp;
2209 struct in_device *in_dev;
2210 struct net *net = sock_net(sk);
2211 __be32 group = imr->imr_multiaddr.s_addr;
2212 u32 ifindex;
2213 int ret = -EADDRNOTAVAIL;
2214
2215 ASSERT_RTNL();
2216
2217 in_dev = ip_mc_find_dev(net, imr);
2218 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2219 ret = -ENODEV;
2220 goto out;
2221 }
2222 ifindex = imr->imr_ifindex;
2223 for (imlp = &inet->mc_list;
2224 (iml = rtnl_dereference(*imlp)) != NULL;
2225 imlp = &iml->next_rcu) {
2226 if (iml->multi.imr_multiaddr.s_addr != group)
2227 continue;
2228 if (ifindex) {
2229 if (iml->multi.imr_ifindex != ifindex)
2230 continue;
2231 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2232 iml->multi.imr_address.s_addr)
2233 continue;
2234
2235 (void) ip_mc_leave_src(sk, iml, in_dev);
2236
2237 *imlp = iml->next_rcu;
2238
2239 if (in_dev)
2240 ip_mc_dec_group(in_dev, group);
2241
2242 /* decrease mem now to avoid the memleak warning */
2243 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2244 kfree_rcu(iml, rcu);
2245 return 0;
2246 }
2247out:
2248 return ret;
2249}
2250EXPORT_SYMBOL(ip_mc_leave_group);
2251
2252int ip_mc_source(int add, int omode, struct sock *sk, struct
2253 ip_mreq_source *mreqs, int ifindex)
2254{
2255 int err;
2256 struct ip_mreqn imr;
2257 __be32 addr = mreqs->imr_multiaddr;
2258 struct ip_mc_socklist *pmc;
2259 struct in_device *in_dev = NULL;
2260 struct inet_sock *inet = inet_sk(sk);
2261 struct ip_sf_socklist *psl;
2262 struct net *net = sock_net(sk);
2263 int leavegroup = 0;
2264 int i, j, rv;
2265
2266 if (!ipv4_is_multicast(addr))
2267 return -EINVAL;
2268
2269 ASSERT_RTNL();
2270
2271 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2272 imr.imr_address.s_addr = mreqs->imr_interface;
2273 imr.imr_ifindex = ifindex;
2274 in_dev = ip_mc_find_dev(net, &imr);
2275
2276 if (!in_dev) {
2277 err = -ENODEV;
2278 goto done;
2279 }
2280 err = -EADDRNOTAVAIL;
2281
2282 for_each_pmc_rtnl(inet, pmc) {
2283 if ((pmc->multi.imr_multiaddr.s_addr ==
2284 imr.imr_multiaddr.s_addr) &&
2285 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2286 break;
2287 }
2288 if (!pmc) { /* must have a prior join */
2289 err = -EINVAL;
2290 goto done;
2291 }
2292 /* if a source filter was set, must be the same mode as before */
2293 if (pmc->sflist) {
2294 if (pmc->sfmode != omode) {
2295 err = -EINVAL;
2296 goto done;
2297 }
2298 } else if (pmc->sfmode != omode) {
2299 /* allow mode switches for empty-set filters */
2300 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2301 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2302 NULL, 0);
2303 pmc->sfmode = omode;
2304 }
2305
2306 psl = rtnl_dereference(pmc->sflist);
2307 if (!add) {
2308 if (!psl)
2309 goto done; /* err = -EADDRNOTAVAIL */
2310 rv = !0;
2311 for (i = 0; i < psl->sl_count; i++) {
2312 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2313 sizeof(__be32));
2314 if (rv == 0)
2315 break;
2316 }
2317 if (rv) /* source not found */
2318 goto done; /* err = -EADDRNOTAVAIL */
2319
2320 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2321 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2322 leavegroup = 1;
2323 goto done;
2324 }
2325
2326 /* update the interface filter */
2327 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2328 &mreqs->imr_sourceaddr, 1);
2329
2330 for (j = i+1; j < psl->sl_count; j++)
2331 psl->sl_addr[j-1] = psl->sl_addr[j];
2332 psl->sl_count--;
2333 err = 0;
2334 goto done;
2335 }
2336 /* else, add a new source to the filter */
2337
2338 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2339 err = -ENOBUFS;
2340 goto done;
2341 }
2342 if (!psl || psl->sl_count == psl->sl_max) {
2343 struct ip_sf_socklist *newpsl;
2344 int count = IP_SFBLOCK;
2345
2346 if (psl)
2347 count += psl->sl_max;
2348 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2349 if (!newpsl) {
2350 err = -ENOBUFS;
2351 goto done;
2352 }
2353 newpsl->sl_max = count;
2354 newpsl->sl_count = count - IP_SFBLOCK;
2355 if (psl) {
2356 for (i = 0; i < psl->sl_count; i++)
2357 newpsl->sl_addr[i] = psl->sl_addr[i];
2358 /* decrease mem now to avoid the memleak warning */
2359 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2360 kfree_rcu(psl, rcu);
2361 }
2362 rcu_assign_pointer(pmc->sflist, newpsl);
2363 psl = newpsl;
2364 }
2365 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2366 for (i = 0; i < psl->sl_count; i++) {
2367 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2368 sizeof(__be32));
2369 if (rv == 0)
2370 break;
2371 }
2372 if (rv == 0) /* address already there is an error */
2373 goto done;
2374 for (j = psl->sl_count-1; j >= i; j--)
2375 psl->sl_addr[j+1] = psl->sl_addr[j];
2376 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2377 psl->sl_count++;
2378 err = 0;
2379 /* update the interface list */
2380 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2381 &mreqs->imr_sourceaddr, 1);
2382done:
2383 if (leavegroup)
2384 err = ip_mc_leave_group(sk, &imr);
2385 return err;
2386}
2387
2388int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2389{
2390 int err = 0;
2391 struct ip_mreqn imr;
2392 __be32 addr = msf->imsf_multiaddr;
2393 struct ip_mc_socklist *pmc;
2394 struct in_device *in_dev;
2395 struct inet_sock *inet = inet_sk(sk);
2396 struct ip_sf_socklist *newpsl, *psl;
2397 struct net *net = sock_net(sk);
2398 int leavegroup = 0;
2399
2400 if (!ipv4_is_multicast(addr))
2401 return -EINVAL;
2402 if (msf->imsf_fmode != MCAST_INCLUDE &&
2403 msf->imsf_fmode != MCAST_EXCLUDE)
2404 return -EINVAL;
2405
2406 ASSERT_RTNL();
2407
2408 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2409 imr.imr_address.s_addr = msf->imsf_interface;
2410 imr.imr_ifindex = ifindex;
2411 in_dev = ip_mc_find_dev(net, &imr);
2412
2413 if (!in_dev) {
2414 err = -ENODEV;
2415 goto done;
2416 }
2417
2418 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2419 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2420 leavegroup = 1;
2421 goto done;
2422 }
2423
2424 for_each_pmc_rtnl(inet, pmc) {
2425 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2426 pmc->multi.imr_ifindex == imr.imr_ifindex)
2427 break;
2428 }
2429 if (!pmc) { /* must have a prior join */
2430 err = -EINVAL;
2431 goto done;
2432 }
2433 if (msf->imsf_numsrc) {
2434 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2435 GFP_KERNEL);
2436 if (!newpsl) {
2437 err = -ENOBUFS;
2438 goto done;
2439 }
2440 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2441 memcpy(newpsl->sl_addr, msf->imsf_slist,
2442 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2443 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2444 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2445 if (err) {
2446 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2447 goto done;
2448 }
2449 } else {
2450 newpsl = NULL;
2451 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2452 msf->imsf_fmode, 0, NULL, 0);
2453 }
2454 psl = rtnl_dereference(pmc->sflist);
2455 if (psl) {
2456 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2457 psl->sl_count, psl->sl_addr, 0);
2458 /* decrease mem now to avoid the memleak warning */
2459 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2460 kfree_rcu(psl, rcu);
2461 } else
2462 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2463 0, NULL, 0);
2464 rcu_assign_pointer(pmc->sflist, newpsl);
2465 pmc->sfmode = msf->imsf_fmode;
2466 err = 0;
2467done:
2468 if (leavegroup)
2469 err = ip_mc_leave_group(sk, &imr);
2470 return err;
2471}
2472
2473int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2474 struct ip_msfilter __user *optval, int __user *optlen)
2475{
2476 int err, len, count, copycount;
2477 struct ip_mreqn imr;
2478 __be32 addr = msf->imsf_multiaddr;
2479 struct ip_mc_socklist *pmc;
2480 struct in_device *in_dev;
2481 struct inet_sock *inet = inet_sk(sk);
2482 struct ip_sf_socklist *psl;
2483 struct net *net = sock_net(sk);
2484
2485 ASSERT_RTNL();
2486
2487 if (!ipv4_is_multicast(addr))
2488 return -EINVAL;
2489
2490 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2491 imr.imr_address.s_addr = msf->imsf_interface;
2492 imr.imr_ifindex = 0;
2493 in_dev = ip_mc_find_dev(net, &imr);
2494
2495 if (!in_dev) {
2496 err = -ENODEV;
2497 goto done;
2498 }
2499 err = -EADDRNOTAVAIL;
2500
2501 for_each_pmc_rtnl(inet, pmc) {
2502 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2503 pmc->multi.imr_ifindex == imr.imr_ifindex)
2504 break;
2505 }
2506 if (!pmc) /* must have a prior join */
2507 goto done;
2508 msf->imsf_fmode = pmc->sfmode;
2509 psl = rtnl_dereference(pmc->sflist);
2510 if (!psl) {
2511 len = 0;
2512 count = 0;
2513 } else {
2514 count = psl->sl_count;
2515 }
2516 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2517 len = copycount * sizeof(psl->sl_addr[0]);
2518 msf->imsf_numsrc = count;
2519 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2520 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2521 return -EFAULT;
2522 }
2523 if (len &&
2524 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2525 return -EFAULT;
2526 return 0;
2527done:
2528 return err;
2529}
2530
2531int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2532 struct group_filter __user *optval, int __user *optlen)
2533{
2534 int err, i, count, copycount;
2535 struct sockaddr_in *psin;
2536 __be32 addr;
2537 struct ip_mc_socklist *pmc;
2538 struct inet_sock *inet = inet_sk(sk);
2539 struct ip_sf_socklist *psl;
2540
2541 ASSERT_RTNL();
2542
2543 psin = (struct sockaddr_in *)&gsf->gf_group;
2544 if (psin->sin_family != AF_INET)
2545 return -EINVAL;
2546 addr = psin->sin_addr.s_addr;
2547 if (!ipv4_is_multicast(addr))
2548 return -EINVAL;
2549
2550 err = -EADDRNOTAVAIL;
2551
2552 for_each_pmc_rtnl(inet, pmc) {
2553 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2554 pmc->multi.imr_ifindex == gsf->gf_interface)
2555 break;
2556 }
2557 if (!pmc) /* must have a prior join */
2558 goto done;
2559 gsf->gf_fmode = pmc->sfmode;
2560 psl = rtnl_dereference(pmc->sflist);
2561 count = psl ? psl->sl_count : 0;
2562 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2563 gsf->gf_numsrc = count;
2564 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2565 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2566 return -EFAULT;
2567 }
2568 for (i = 0; i < copycount; i++) {
2569 struct sockaddr_storage ss;
2570
2571 psin = (struct sockaddr_in *)&ss;
2572 memset(&ss, 0, sizeof(ss));
2573 psin->sin_family = AF_INET;
2574 psin->sin_addr.s_addr = psl->sl_addr[i];
2575 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2576 return -EFAULT;
2577 }
2578 return 0;
2579done:
2580 return err;
2581}
2582
2583/*
2584 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2585 */
2586int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr,
2587 int dif, int sdif)
2588{
2589 struct inet_sock *inet = inet_sk(sk);
2590 struct ip_mc_socklist *pmc;
2591 struct ip_sf_socklist *psl;
2592 int i;
2593 int ret;
2594
2595 ret = 1;
2596 if (!ipv4_is_multicast(loc_addr))
2597 goto out;
2598
2599 rcu_read_lock();
2600 for_each_pmc_rcu(inet, pmc) {
2601 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2602 (pmc->multi.imr_ifindex == dif ||
2603 (sdif && pmc->multi.imr_ifindex == sdif)))
2604 break;
2605 }
2606 ret = inet->mc_all;
2607 if (!pmc)
2608 goto unlock;
2609 psl = rcu_dereference(pmc->sflist);
2610 ret = (pmc->sfmode == MCAST_EXCLUDE);
2611 if (!psl)
2612 goto unlock;
2613
2614 for (i = 0; i < psl->sl_count; i++) {
2615 if (psl->sl_addr[i] == rmt_addr)
2616 break;
2617 }
2618 ret = 0;
2619 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2620 goto unlock;
2621 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2622 goto unlock;
2623 ret = 1;
2624unlock:
2625 rcu_read_unlock();
2626out:
2627 return ret;
2628}
2629
2630/*
2631 * A socket is closing.
2632 */
2633
2634void ip_mc_drop_socket(struct sock *sk)
2635{
2636 struct inet_sock *inet = inet_sk(sk);
2637 struct ip_mc_socklist *iml;
2638 struct net *net = sock_net(sk);
2639
2640 if (!inet->mc_list)
2641 return;
2642
2643 rtnl_lock();
2644 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2645 struct in_device *in_dev;
2646
2647 inet->mc_list = iml->next_rcu;
2648 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2649 (void) ip_mc_leave_src(sk, iml, in_dev);
2650 if (in_dev)
2651 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2652 /* decrease mem now to avoid the memleak warning */
2653 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2654 kfree_rcu(iml, rcu);
2655 }
2656 rtnl_unlock();
2657}
2658
2659/* called with rcu_read_lock() */
2660int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2661{
2662 struct ip_mc_list *im;
2663 struct ip_mc_list __rcu **mc_hash;
2664 struct ip_sf_list *psf;
2665 int rv = 0;
2666
2667 mc_hash = rcu_dereference(in_dev->mc_hash);
2668 if (mc_hash) {
2669 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2670
2671 for (im = rcu_dereference(mc_hash[hash]);
2672 im != NULL;
2673 im = rcu_dereference(im->next_hash)) {
2674 if (im->multiaddr == mc_addr)
2675 break;
2676 }
2677 } else {
2678 for_each_pmc_rcu(in_dev, im) {
2679 if (im->multiaddr == mc_addr)
2680 break;
2681 }
2682 }
2683 if (im && proto == IPPROTO_IGMP) {
2684 rv = 1;
2685 } else if (im) {
2686 if (src_addr) {
2687 for (psf = im->sources; psf; psf = psf->sf_next) {
2688 if (psf->sf_inaddr == src_addr)
2689 break;
2690 }
2691 if (psf)
2692 rv = psf->sf_count[MCAST_INCLUDE] ||
2693 psf->sf_count[MCAST_EXCLUDE] !=
2694 im->sfcount[MCAST_EXCLUDE];
2695 else
2696 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2697 } else
2698 rv = 1; /* unspecified source; tentatively allow */
2699 }
2700 return rv;
2701}
2702
2703#if defined(CONFIG_PROC_FS)
2704struct igmp_mc_iter_state {
2705 struct seq_net_private p;
2706 struct net_device *dev;
2707 struct in_device *in_dev;
2708};
2709
2710#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2711
2712static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2713{
2714 struct net *net = seq_file_net(seq);
2715 struct ip_mc_list *im = NULL;
2716 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2717
2718 state->in_dev = NULL;
2719 for_each_netdev_rcu(net, state->dev) {
2720 struct in_device *in_dev;
2721
2722 in_dev = __in_dev_get_rcu(state->dev);
2723 if (!in_dev)
2724 continue;
2725 im = rcu_dereference(in_dev->mc_list);
2726 if (im) {
2727 state->in_dev = in_dev;
2728 break;
2729 }
2730 }
2731 return im;
2732}
2733
2734static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2735{
2736 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2737
2738 im = rcu_dereference(im->next_rcu);
2739 while (!im) {
2740 state->dev = next_net_device_rcu(state->dev);
2741 if (!state->dev) {
2742 state->in_dev = NULL;
2743 break;
2744 }
2745 state->in_dev = __in_dev_get_rcu(state->dev);
2746 if (!state->in_dev)
2747 continue;
2748 im = rcu_dereference(state->in_dev->mc_list);
2749 }
2750 return im;
2751}
2752
2753static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2754{
2755 struct ip_mc_list *im = igmp_mc_get_first(seq);
2756 if (im)
2757 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2758 --pos;
2759 return pos ? NULL : im;
2760}
2761
2762static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2763 __acquires(rcu)
2764{
2765 rcu_read_lock();
2766 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2767}
2768
2769static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2770{
2771 struct ip_mc_list *im;
2772 if (v == SEQ_START_TOKEN)
2773 im = igmp_mc_get_first(seq);
2774 else
2775 im = igmp_mc_get_next(seq, v);
2776 ++*pos;
2777 return im;
2778}
2779
2780static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2781 __releases(rcu)
2782{
2783 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2784
2785 state->in_dev = NULL;
2786 state->dev = NULL;
2787 rcu_read_unlock();
2788}
2789
2790static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2791{
2792 if (v == SEQ_START_TOKEN)
2793 seq_puts(seq,
2794 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2795 else {
2796 struct ip_mc_list *im = (struct ip_mc_list *)v;
2797 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2798 char *querier;
2799 long delta;
2800
2801#ifdef CONFIG_IP_MULTICAST
2802 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2803 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2804 "V3";
2805#else
2806 querier = "NONE";
2807#endif
2808
2809 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2810 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2811 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2812 }
2813
2814 delta = im->timer.expires - jiffies;
2815 seq_printf(seq,
2816 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2817 im->multiaddr, im->users,
2818 im->tm_running,
2819 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2820 im->reporter);
2821 }
2822 return 0;
2823}
2824
2825static const struct seq_operations igmp_mc_seq_ops = {
2826 .start = igmp_mc_seq_start,
2827 .next = igmp_mc_seq_next,
2828 .stop = igmp_mc_seq_stop,
2829 .show = igmp_mc_seq_show,
2830};
2831
2832static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2833{
2834 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2835 sizeof(struct igmp_mc_iter_state));
2836}
2837
2838static const struct file_operations igmp_mc_seq_fops = {
2839 .open = igmp_mc_seq_open,
2840 .read = seq_read,
2841 .llseek = seq_lseek,
2842 .release = seq_release_net,
2843};
2844
2845struct igmp_mcf_iter_state {
2846 struct seq_net_private p;
2847 struct net_device *dev;
2848 struct in_device *idev;
2849 struct ip_mc_list *im;
2850};
2851
2852#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2853
2854static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2855{
2856 struct net *net = seq_file_net(seq);
2857 struct ip_sf_list *psf = NULL;
2858 struct ip_mc_list *im = NULL;
2859 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2860
2861 state->idev = NULL;
2862 state->im = NULL;
2863 for_each_netdev_rcu(net, state->dev) {
2864 struct in_device *idev;
2865 idev = __in_dev_get_rcu(state->dev);
2866 if (unlikely(!idev))
2867 continue;
2868 im = rcu_dereference(idev->mc_list);
2869 if (likely(im)) {
2870 spin_lock_bh(&im->lock);
2871 psf = im->sources;
2872 if (likely(psf)) {
2873 state->im = im;
2874 state->idev = idev;
2875 break;
2876 }
2877 spin_unlock_bh(&im->lock);
2878 }
2879 }
2880 return psf;
2881}
2882
2883static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2884{
2885 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2886
2887 psf = psf->sf_next;
2888 while (!psf) {
2889 spin_unlock_bh(&state->im->lock);
2890 state->im = state->im->next;
2891 while (!state->im) {
2892 state->dev = next_net_device_rcu(state->dev);
2893 if (!state->dev) {
2894 state->idev = NULL;
2895 goto out;
2896 }
2897 state->idev = __in_dev_get_rcu(state->dev);
2898 if (!state->idev)
2899 continue;
2900 state->im = rcu_dereference(state->idev->mc_list);
2901 }
2902 if (!state->im)
2903 break;
2904 spin_lock_bh(&state->im->lock);
2905 psf = state->im->sources;
2906 }
2907out:
2908 return psf;
2909}
2910
2911static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2912{
2913 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2914 if (psf)
2915 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2916 --pos;
2917 return pos ? NULL : psf;
2918}
2919
2920static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2921 __acquires(rcu)
2922{
2923 rcu_read_lock();
2924 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2925}
2926
2927static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2928{
2929 struct ip_sf_list *psf;
2930 if (v == SEQ_START_TOKEN)
2931 psf = igmp_mcf_get_first(seq);
2932 else
2933 psf = igmp_mcf_get_next(seq, v);
2934 ++*pos;
2935 return psf;
2936}
2937
2938static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2939 __releases(rcu)
2940{
2941 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2942 if (likely(state->im)) {
2943 spin_unlock_bh(&state->im->lock);
2944 state->im = NULL;
2945 }
2946 state->idev = NULL;
2947 state->dev = NULL;
2948 rcu_read_unlock();
2949}
2950
2951static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2952{
2953 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2954 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2955
2956 if (v == SEQ_START_TOKEN) {
2957 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2958 } else {
2959 seq_printf(seq,
2960 "%3d %6.6s 0x%08x "
2961 "0x%08x %6lu %6lu\n",
2962 state->dev->ifindex, state->dev->name,
2963 ntohl(state->im->multiaddr),
2964 ntohl(psf->sf_inaddr),
2965 psf->sf_count[MCAST_INCLUDE],
2966 psf->sf_count[MCAST_EXCLUDE]);
2967 }
2968 return 0;
2969}
2970
2971static const struct seq_operations igmp_mcf_seq_ops = {
2972 .start = igmp_mcf_seq_start,
2973 .next = igmp_mcf_seq_next,
2974 .stop = igmp_mcf_seq_stop,
2975 .show = igmp_mcf_seq_show,
2976};
2977
2978static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2979{
2980 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2981 sizeof(struct igmp_mcf_iter_state));
2982}
2983
2984static const struct file_operations igmp_mcf_seq_fops = {
2985 .open = igmp_mcf_seq_open,
2986 .read = seq_read,
2987 .llseek = seq_lseek,
2988 .release = seq_release_net,
2989};
2990
2991static int __net_init igmp_net_init(struct net *net)
2992{
2993 struct proc_dir_entry *pde;
2994 int err;
2995
2996 pde = proc_create("igmp", 0444, net->proc_net, &igmp_mc_seq_fops);
2997 if (!pde)
2998 goto out_igmp;
2999 pde = proc_create("mcfilter", 0444, net->proc_net,
3000 &igmp_mcf_seq_fops);
3001 if (!pde)
3002 goto out_mcfilter;
3003 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
3004 SOCK_DGRAM, 0, net);
3005 if (err < 0) {
3006 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
3007 err);
3008 goto out_sock;
3009 }
3010
3011 return 0;
3012
3013out_sock:
3014 remove_proc_entry("mcfilter", net->proc_net);
3015out_mcfilter:
3016 remove_proc_entry("igmp", net->proc_net);
3017out_igmp:
3018 return -ENOMEM;
3019}
3020
3021static void __net_exit igmp_net_exit(struct net *net)
3022{
3023 remove_proc_entry("mcfilter", net->proc_net);
3024 remove_proc_entry("igmp", net->proc_net);
3025 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
3026}
3027
3028static struct pernet_operations igmp_net_ops = {
3029 .init = igmp_net_init,
3030 .exit = igmp_net_exit,
3031};
3032#endif
3033
3034static int igmp_netdev_event(struct notifier_block *this,
3035 unsigned long event, void *ptr)
3036{
3037 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3038 struct in_device *in_dev;
3039
3040 switch (event) {
3041 case NETDEV_RESEND_IGMP:
3042 in_dev = __in_dev_get_rtnl(dev);
3043 if (in_dev)
3044 ip_mc_rejoin_groups(in_dev);
3045 break;
3046 default:
3047 break;
3048 }
3049 return NOTIFY_DONE;
3050}
3051
3052static struct notifier_block igmp_notifier = {
3053 .notifier_call = igmp_netdev_event,
3054};
3055
3056int __init igmp_mc_init(void)
3057{
3058#if defined(CONFIG_PROC_FS)
3059 int err;
3060
3061 err = register_pernet_subsys(&igmp_net_ops);
3062 if (err)
3063 return err;
3064 err = register_netdevice_notifier(&igmp_notifier);
3065 if (err)
3066 goto reg_notif_fail;
3067 return 0;
3068
3069reg_notif_fail:
3070 unregister_pernet_subsys(&igmp_net_ops);
3071 return err;
3072#else
3073 return register_netdevice_notifier(&igmp_notifier);
3074#endif
3075}