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