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