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Merge remote-tracking branch 'vfio/next'
[deliverable/linux.git] / net / ipv4 / igmp.c
1 /*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
6 *
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
10 *
11 * Authors:
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 * Fixes:
20 *
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
23 * functions.
24 * Alan Cox : Dumped the header building experiment.
25 * Alan Cox : Minor tweaks ready for multicast routing
26 * and extended IGMP protocol.
27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
28 * writes utterly bogus code otherwise (sigh)
29 * fixed IGMP loopback to behave in the manner
30 * desired by mrouted, fixed the fact it has been
31 * broken since 1.3.6 and cleaned up a few minor
32 * points.
33 *
34 * Chih-Jen Chang : Tried to revise IGMP to Version 2
35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
36 * The enhancements are mainly based on Steve Deering's
37 * ipmulti-3.5 source code.
38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
40 * the mrouted version on that device.
41 * Chih-Jen Chang : Added the max_resp_time parameter to
42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
43 * to identify the multicast router version
44 * and do what the IGMP version 2 specified.
45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
46 * Tsu-Sheng Tsao if the specified time expired.
47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
48 * Alan Cox : Use GFP_ATOMIC in the right places.
49 * Christian Daudt : igmp timer wasn't set for local group
50 * memberships but was being deleted,
51 * which caused a "del_timer() called
52 * from %p with timer not initialized\n"
53 * message (960131).
54 * Christian Daudt : removed del_timer from
55 * igmp_timer_expire function (960205).
56 * Christian Daudt : igmp_heard_report now only calls
57 * igmp_timer_expire if tm->running is
58 * true (960216).
59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
60 * igmp_heard_query never trigger. Expiry
61 * miscalculation fixed in igmp_heard_query
62 * and random() made to return unsigned to
63 * prevent negative expiry times.
64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
65 * fix from pending 2.1.x patches.
66 * Alan Cox: Forget to enable FDDI support earlier.
67 * Alexey Kuznetsov: Fixed leaving groups on device down.
68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
69 * David L Stevens: IGMPv3 support, with help from
70 * Vinay Kulkarni
71 */
72
73 #include <linux/module.h>
74 #include <linux/slab.h>
75 #include <asm/uaccess.h>
76 #include <linux/types.h>
77 #include <linux/kernel.h>
78 #include <linux/jiffies.h>
79 #include <linux/string.h>
80 #include <linux/socket.h>
81 #include <linux/sockios.h>
82 #include <linux/in.h>
83 #include <linux/inet.h>
84 #include <linux/netdevice.h>
85 #include <linux/skbuff.h>
86 #include <linux/inetdevice.h>
87 #include <linux/igmp.h>
88 #include <linux/if_arp.h>
89 #include <linux/rtnetlink.h>
90 #include <linux/times.h>
91 #include <linux/pkt_sched.h>
92
93 #include <net/net_namespace.h>
94 #include <net/arp.h>
95 #include <net/ip.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
98 #include <net/sock.h>
99 #include <net/checksum.h>
100 #include <net/inet_common.h>
101 #include <linux/netfilter_ipv4.h>
102 #ifdef CONFIG_IP_MROUTE
103 #include <linux/mroute.h>
104 #endif
105 #ifdef CONFIG_PROC_FS
106 #include <linux/proc_fs.h>
107 #include <linux/seq_file.h>
108 #endif
109
110 #ifdef CONFIG_IP_MULTICAST
111 /* Parameter names and values are taken from igmp-v2-06 draft */
112
113 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
114 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
115 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
116 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
117 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
118 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
119
120
121 #define IGMP_INITIAL_REPORT_DELAY (1)
122
123 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
124 * IGMP specs require to report membership immediately after
125 * joining a group, but we delay the first report by a
126 * small interval. It seems more natural and still does not
127 * contradict to specs provided this delay is small enough.
128 */
129
130 #define IGMP_V1_SEEN(in_dev) \
131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
133 ((in_dev)->mr_v1_seen && \
134 time_before(jiffies, (in_dev)->mr_v1_seen)))
135 #define IGMP_V2_SEEN(in_dev) \
136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
138 ((in_dev)->mr_v2_seen && \
139 time_before(jiffies, (in_dev)->mr_v2_seen)))
140
141 static int unsolicited_report_interval(struct in_device *in_dev)
142 {
143 int interval_ms, interval_jiffies;
144
145 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
146 interval_ms = IN_DEV_CONF_GET(
147 in_dev,
148 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
149 else /* v3 */
150 interval_ms = IN_DEV_CONF_GET(
151 in_dev,
152 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
153
154 interval_jiffies = msecs_to_jiffies(interval_ms);
155
156 /* _timer functions can't handle a delay of 0 jiffies so ensure
157 * we always return a positive value.
158 */
159 if (interval_jiffies <= 0)
160 interval_jiffies = 1;
161 return interval_jiffies;
162 }
163
164 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
165 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
166 static void igmpv3_clear_delrec(struct in_device *in_dev);
167 static int sf_setstate(struct ip_mc_list *pmc);
168 static void sf_markstate(struct ip_mc_list *pmc);
169 #endif
170 static void ip_mc_clear_src(struct ip_mc_list *pmc);
171 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
172 int sfcount, __be32 *psfsrc, int delta);
173
174 static void ip_ma_put(struct ip_mc_list *im)
175 {
176 if (atomic_dec_and_test(&im->refcnt)) {
177 in_dev_put(im->interface);
178 kfree_rcu(im, rcu);
179 }
180 }
181
182 #define for_each_pmc_rcu(in_dev, pmc) \
183 for (pmc = rcu_dereference(in_dev->mc_list); \
184 pmc != NULL; \
185 pmc = rcu_dereference(pmc->next_rcu))
186
187 #define for_each_pmc_rtnl(in_dev, pmc) \
188 for (pmc = rtnl_dereference(in_dev->mc_list); \
189 pmc != NULL; \
190 pmc = rtnl_dereference(pmc->next_rcu))
191
192 #ifdef CONFIG_IP_MULTICAST
193
194 /*
195 * Timer management
196 */
197
198 static void igmp_stop_timer(struct ip_mc_list *im)
199 {
200 spin_lock_bh(&im->lock);
201 if (del_timer(&im->timer))
202 atomic_dec(&im->refcnt);
203 im->tm_running = 0;
204 im->reporter = 0;
205 im->unsolicit_count = 0;
206 spin_unlock_bh(&im->lock);
207 }
208
209 /* It must be called with locked im->lock */
210 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
211 {
212 int tv = prandom_u32() % max_delay;
213
214 im->tm_running = 1;
215 if (!mod_timer(&im->timer, jiffies+tv+2))
216 atomic_inc(&im->refcnt);
217 }
218
219 static void igmp_gq_start_timer(struct in_device *in_dev)
220 {
221 int tv = prandom_u32() % in_dev->mr_maxdelay;
222
223 in_dev->mr_gq_running = 1;
224 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
225 in_dev_hold(in_dev);
226 }
227
228 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
229 {
230 int tv = prandom_u32() % delay;
231
232 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
233 in_dev_hold(in_dev);
234 }
235
236 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
237 {
238 spin_lock_bh(&im->lock);
239 im->unsolicit_count = 0;
240 if (del_timer(&im->timer)) {
241 if ((long)(im->timer.expires-jiffies) < max_delay) {
242 add_timer(&im->timer);
243 im->tm_running = 1;
244 spin_unlock_bh(&im->lock);
245 return;
246 }
247 atomic_dec(&im->refcnt);
248 }
249 igmp_start_timer(im, max_delay);
250 spin_unlock_bh(&im->lock);
251 }
252
253
254 /*
255 * Send an IGMP report.
256 */
257
258 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
259
260
261 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
262 int gdeleted, int sdeleted)
263 {
264 switch (type) {
265 case IGMPV3_MODE_IS_INCLUDE:
266 case IGMPV3_MODE_IS_EXCLUDE:
267 if (gdeleted || sdeleted)
268 return 0;
269 if (!(pmc->gsquery && !psf->sf_gsresp)) {
270 if (pmc->sfmode == MCAST_INCLUDE)
271 return 1;
272 /* don't include if this source is excluded
273 * in all filters
274 */
275 if (psf->sf_count[MCAST_INCLUDE])
276 return type == IGMPV3_MODE_IS_INCLUDE;
277 return pmc->sfcount[MCAST_EXCLUDE] ==
278 psf->sf_count[MCAST_EXCLUDE];
279 }
280 return 0;
281 case IGMPV3_CHANGE_TO_INCLUDE:
282 if (gdeleted || sdeleted)
283 return 0;
284 return psf->sf_count[MCAST_INCLUDE] != 0;
285 case IGMPV3_CHANGE_TO_EXCLUDE:
286 if (gdeleted || sdeleted)
287 return 0;
288 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
289 psf->sf_count[MCAST_INCLUDE])
290 return 0;
291 return pmc->sfcount[MCAST_EXCLUDE] ==
292 psf->sf_count[MCAST_EXCLUDE];
293 case IGMPV3_ALLOW_NEW_SOURCES:
294 if (gdeleted || !psf->sf_crcount)
295 return 0;
296 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
297 case IGMPV3_BLOCK_OLD_SOURCES:
298 if (pmc->sfmode == MCAST_INCLUDE)
299 return gdeleted || (psf->sf_crcount && sdeleted);
300 return psf->sf_crcount && !gdeleted && !sdeleted;
301 }
302 return 0;
303 }
304
305 static int
306 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
307 {
308 struct ip_sf_list *psf;
309 int scount = 0;
310
311 for (psf = pmc->sources; psf; psf = psf->sf_next) {
312 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
313 continue;
314 scount++;
315 }
316 return scount;
317 }
318
319 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
320 {
321 struct sk_buff *skb;
322 struct rtable *rt;
323 struct iphdr *pip;
324 struct igmpv3_report *pig;
325 struct net *net = dev_net(dev);
326 struct flowi4 fl4;
327 int hlen = LL_RESERVED_SPACE(dev);
328 int tlen = dev->needed_tailroom;
329 unsigned int size = mtu;
330
331 while (1) {
332 skb = alloc_skb(size + hlen + tlen,
333 GFP_ATOMIC | __GFP_NOWARN);
334 if (skb)
335 break;
336 size >>= 1;
337 if (size < 256)
338 return NULL;
339 }
340 skb->priority = TC_PRIO_CONTROL;
341
342 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
343 0, 0,
344 IPPROTO_IGMP, 0, dev->ifindex);
345 if (IS_ERR(rt)) {
346 kfree_skb(skb);
347 return NULL;
348 }
349
350 skb_dst_set(skb, &rt->dst);
351 skb->dev = dev;
352
353 skb_reserve(skb, hlen);
354 skb_tailroom_reserve(skb, mtu, tlen);
355
356 skb_reset_network_header(skb);
357 pip = ip_hdr(skb);
358 skb_put(skb, sizeof(struct iphdr) + 4);
359
360 pip->version = 4;
361 pip->ihl = (sizeof(struct iphdr)+4)>>2;
362 pip->tos = 0xc0;
363 pip->frag_off = htons(IP_DF);
364 pip->ttl = 1;
365 pip->daddr = fl4.daddr;
366 pip->saddr = fl4.saddr;
367 pip->protocol = IPPROTO_IGMP;
368 pip->tot_len = 0; /* filled in later */
369 ip_select_ident(net, skb, NULL);
370 ((u8 *)&pip[1])[0] = IPOPT_RA;
371 ((u8 *)&pip[1])[1] = 4;
372 ((u8 *)&pip[1])[2] = 0;
373 ((u8 *)&pip[1])[3] = 0;
374
375 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
376 skb_put(skb, sizeof(*pig));
377 pig = igmpv3_report_hdr(skb);
378 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
379 pig->resv1 = 0;
380 pig->csum = 0;
381 pig->resv2 = 0;
382 pig->ngrec = 0;
383 return skb;
384 }
385
386 static int igmpv3_sendpack(struct sk_buff *skb)
387 {
388 struct igmphdr *pig = igmp_hdr(skb);
389 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
390
391 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
392
393 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
394 }
395
396 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
397 {
398 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
399 }
400
401 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
402 int type, struct igmpv3_grec **ppgr)
403 {
404 struct net_device *dev = pmc->interface->dev;
405 struct igmpv3_report *pih;
406 struct igmpv3_grec *pgr;
407
408 if (!skb)
409 skb = igmpv3_newpack(dev, dev->mtu);
410 if (!skb)
411 return NULL;
412 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
413 pgr->grec_type = type;
414 pgr->grec_auxwords = 0;
415 pgr->grec_nsrcs = 0;
416 pgr->grec_mca = pmc->multiaddr;
417 pih = igmpv3_report_hdr(skb);
418 pih->ngrec = htons(ntohs(pih->ngrec)+1);
419 *ppgr = pgr;
420 return skb;
421 }
422
423 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
424
425 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
426 int type, int gdeleted, int sdeleted)
427 {
428 struct net_device *dev = pmc->interface->dev;
429 struct net *net = dev_net(dev);
430 struct igmpv3_report *pih;
431 struct igmpv3_grec *pgr = NULL;
432 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
433 int scount, stotal, first, isquery, truncate;
434
435 if (pmc->multiaddr == IGMP_ALL_HOSTS)
436 return skb;
437 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
438 return skb;
439
440 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
441 type == IGMPV3_MODE_IS_EXCLUDE;
442 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
443 type == IGMPV3_CHANGE_TO_EXCLUDE;
444
445 stotal = scount = 0;
446
447 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
448
449 if (!*psf_list)
450 goto empty_source;
451
452 pih = skb ? igmpv3_report_hdr(skb) : NULL;
453
454 /* EX and TO_EX get a fresh packet, if needed */
455 if (truncate) {
456 if (pih && pih->ngrec &&
457 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
458 if (skb)
459 igmpv3_sendpack(skb);
460 skb = igmpv3_newpack(dev, dev->mtu);
461 }
462 }
463 first = 1;
464 psf_prev = NULL;
465 for (psf = *psf_list; psf; psf = psf_next) {
466 __be32 *psrc;
467
468 psf_next = psf->sf_next;
469
470 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
471 psf_prev = psf;
472 continue;
473 }
474
475 /* Based on RFC3376 5.1. Should not send source-list change
476 * records when there is a filter mode change.
477 */
478 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
479 (!gdeleted && pmc->crcount)) &&
480 (type == IGMPV3_ALLOW_NEW_SOURCES ||
481 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
482 goto decrease_sf_crcount;
483
484 /* clear marks on query responses */
485 if (isquery)
486 psf->sf_gsresp = 0;
487
488 if (AVAILABLE(skb) < sizeof(__be32) +
489 first*sizeof(struct igmpv3_grec)) {
490 if (truncate && !first)
491 break; /* truncate these */
492 if (pgr)
493 pgr->grec_nsrcs = htons(scount);
494 if (skb)
495 igmpv3_sendpack(skb);
496 skb = igmpv3_newpack(dev, dev->mtu);
497 first = 1;
498 scount = 0;
499 }
500 if (first) {
501 skb = add_grhead(skb, pmc, type, &pgr);
502 first = 0;
503 }
504 if (!skb)
505 return NULL;
506 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
507 *psrc = psf->sf_inaddr;
508 scount++; stotal++;
509 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
510 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
511 decrease_sf_crcount:
512 psf->sf_crcount--;
513 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
514 if (psf_prev)
515 psf_prev->sf_next = psf->sf_next;
516 else
517 *psf_list = psf->sf_next;
518 kfree(psf);
519 continue;
520 }
521 }
522 psf_prev = psf;
523 }
524
525 empty_source:
526 if (!stotal) {
527 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
528 type == IGMPV3_BLOCK_OLD_SOURCES)
529 return skb;
530 if (pmc->crcount || isquery) {
531 /* make sure we have room for group header */
532 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
533 igmpv3_sendpack(skb);
534 skb = NULL; /* add_grhead will get a new one */
535 }
536 skb = add_grhead(skb, pmc, type, &pgr);
537 }
538 }
539 if (pgr)
540 pgr->grec_nsrcs = htons(scount);
541
542 if (isquery)
543 pmc->gsquery = 0; /* clear query state on report */
544 return skb;
545 }
546
547 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
548 {
549 struct sk_buff *skb = NULL;
550 struct net *net = dev_net(in_dev->dev);
551 int type;
552
553 if (!pmc) {
554 rcu_read_lock();
555 for_each_pmc_rcu(in_dev, pmc) {
556 if (pmc->multiaddr == IGMP_ALL_HOSTS)
557 continue;
558 if (ipv4_is_local_multicast(pmc->multiaddr) &&
559 !net->ipv4.sysctl_igmp_llm_reports)
560 continue;
561 spin_lock_bh(&pmc->lock);
562 if (pmc->sfcount[MCAST_EXCLUDE])
563 type = IGMPV3_MODE_IS_EXCLUDE;
564 else
565 type = IGMPV3_MODE_IS_INCLUDE;
566 skb = add_grec(skb, pmc, type, 0, 0);
567 spin_unlock_bh(&pmc->lock);
568 }
569 rcu_read_unlock();
570 } else {
571 spin_lock_bh(&pmc->lock);
572 if (pmc->sfcount[MCAST_EXCLUDE])
573 type = IGMPV3_MODE_IS_EXCLUDE;
574 else
575 type = IGMPV3_MODE_IS_INCLUDE;
576 skb = add_grec(skb, pmc, type, 0, 0);
577 spin_unlock_bh(&pmc->lock);
578 }
579 if (!skb)
580 return 0;
581 return igmpv3_sendpack(skb);
582 }
583
584 /*
585 * remove zero-count source records from a source filter list
586 */
587 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
588 {
589 struct ip_sf_list *psf_prev, *psf_next, *psf;
590
591 psf_prev = NULL;
592 for (psf = *ppsf; psf; psf = psf_next) {
593 psf_next = psf->sf_next;
594 if (psf->sf_crcount == 0) {
595 if (psf_prev)
596 psf_prev->sf_next = psf->sf_next;
597 else
598 *ppsf = psf->sf_next;
599 kfree(psf);
600 } else
601 psf_prev = psf;
602 }
603 }
604
605 static void igmpv3_send_cr(struct in_device *in_dev)
606 {
607 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
608 struct sk_buff *skb = NULL;
609 int type, dtype;
610
611 rcu_read_lock();
612 spin_lock_bh(&in_dev->mc_tomb_lock);
613
614 /* deleted MCA's */
615 pmc_prev = NULL;
616 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
617 pmc_next = pmc->next;
618 if (pmc->sfmode == MCAST_INCLUDE) {
619 type = IGMPV3_BLOCK_OLD_SOURCES;
620 dtype = IGMPV3_BLOCK_OLD_SOURCES;
621 skb = add_grec(skb, pmc, type, 1, 0);
622 skb = add_grec(skb, pmc, dtype, 1, 1);
623 }
624 if (pmc->crcount) {
625 if (pmc->sfmode == MCAST_EXCLUDE) {
626 type = IGMPV3_CHANGE_TO_INCLUDE;
627 skb = add_grec(skb, pmc, type, 1, 0);
628 }
629 pmc->crcount--;
630 if (pmc->crcount == 0) {
631 igmpv3_clear_zeros(&pmc->tomb);
632 igmpv3_clear_zeros(&pmc->sources);
633 }
634 }
635 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
636 if (pmc_prev)
637 pmc_prev->next = pmc_next;
638 else
639 in_dev->mc_tomb = pmc_next;
640 in_dev_put(pmc->interface);
641 kfree(pmc);
642 } else
643 pmc_prev = pmc;
644 }
645 spin_unlock_bh(&in_dev->mc_tomb_lock);
646
647 /* change recs */
648 for_each_pmc_rcu(in_dev, pmc) {
649 spin_lock_bh(&pmc->lock);
650 if (pmc->sfcount[MCAST_EXCLUDE]) {
651 type = IGMPV3_BLOCK_OLD_SOURCES;
652 dtype = IGMPV3_ALLOW_NEW_SOURCES;
653 } else {
654 type = IGMPV3_ALLOW_NEW_SOURCES;
655 dtype = IGMPV3_BLOCK_OLD_SOURCES;
656 }
657 skb = add_grec(skb, pmc, type, 0, 0);
658 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
659
660 /* filter mode changes */
661 if (pmc->crcount) {
662 if (pmc->sfmode == MCAST_EXCLUDE)
663 type = IGMPV3_CHANGE_TO_EXCLUDE;
664 else
665 type = IGMPV3_CHANGE_TO_INCLUDE;
666 skb = add_grec(skb, pmc, type, 0, 0);
667 pmc->crcount--;
668 }
669 spin_unlock_bh(&pmc->lock);
670 }
671 rcu_read_unlock();
672
673 if (!skb)
674 return;
675 (void) igmpv3_sendpack(skb);
676 }
677
678 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
679 int type)
680 {
681 struct sk_buff *skb;
682 struct iphdr *iph;
683 struct igmphdr *ih;
684 struct rtable *rt;
685 struct net_device *dev = in_dev->dev;
686 struct net *net = dev_net(dev);
687 __be32 group = pmc ? pmc->multiaddr : 0;
688 struct flowi4 fl4;
689 __be32 dst;
690 int hlen, tlen;
691
692 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
693 return igmpv3_send_report(in_dev, pmc);
694
695 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
696 return 0;
697
698 if (type == IGMP_HOST_LEAVE_MESSAGE)
699 dst = IGMP_ALL_ROUTER;
700 else
701 dst = group;
702
703 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
704 0, 0,
705 IPPROTO_IGMP, 0, dev->ifindex);
706 if (IS_ERR(rt))
707 return -1;
708
709 hlen = LL_RESERVED_SPACE(dev);
710 tlen = dev->needed_tailroom;
711 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
712 if (!skb) {
713 ip_rt_put(rt);
714 return -1;
715 }
716 skb->priority = TC_PRIO_CONTROL;
717
718 skb_dst_set(skb, &rt->dst);
719
720 skb_reserve(skb, hlen);
721
722 skb_reset_network_header(skb);
723 iph = ip_hdr(skb);
724 skb_put(skb, sizeof(struct iphdr) + 4);
725
726 iph->version = 4;
727 iph->ihl = (sizeof(struct iphdr)+4)>>2;
728 iph->tos = 0xc0;
729 iph->frag_off = htons(IP_DF);
730 iph->ttl = 1;
731 iph->daddr = dst;
732 iph->saddr = fl4.saddr;
733 iph->protocol = IPPROTO_IGMP;
734 ip_select_ident(net, skb, NULL);
735 ((u8 *)&iph[1])[0] = IPOPT_RA;
736 ((u8 *)&iph[1])[1] = 4;
737 ((u8 *)&iph[1])[2] = 0;
738 ((u8 *)&iph[1])[3] = 0;
739
740 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
741 ih->type = type;
742 ih->code = 0;
743 ih->csum = 0;
744 ih->group = group;
745 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
746
747 return ip_local_out(net, skb->sk, skb);
748 }
749
750 static void igmp_gq_timer_expire(unsigned long data)
751 {
752 struct in_device *in_dev = (struct in_device *)data;
753
754 in_dev->mr_gq_running = 0;
755 igmpv3_send_report(in_dev, NULL);
756 in_dev_put(in_dev);
757 }
758
759 static void igmp_ifc_timer_expire(unsigned long data)
760 {
761 struct in_device *in_dev = (struct in_device *)data;
762
763 igmpv3_send_cr(in_dev);
764 if (in_dev->mr_ifc_count) {
765 in_dev->mr_ifc_count--;
766 igmp_ifc_start_timer(in_dev,
767 unsolicited_report_interval(in_dev));
768 }
769 in_dev_put(in_dev);
770 }
771
772 static void igmp_ifc_event(struct in_device *in_dev)
773 {
774 struct net *net = dev_net(in_dev->dev);
775 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
776 return;
777 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
778 igmp_ifc_start_timer(in_dev, 1);
779 }
780
781
782 static void igmp_timer_expire(unsigned long data)
783 {
784 struct ip_mc_list *im = (struct ip_mc_list *)data;
785 struct in_device *in_dev = im->interface;
786
787 spin_lock(&im->lock);
788 im->tm_running = 0;
789
790 if (im->unsolicit_count) {
791 im->unsolicit_count--;
792 igmp_start_timer(im, unsolicited_report_interval(in_dev));
793 }
794 im->reporter = 1;
795 spin_unlock(&im->lock);
796
797 if (IGMP_V1_SEEN(in_dev))
798 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
799 else if (IGMP_V2_SEEN(in_dev))
800 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
801 else
802 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
803
804 ip_ma_put(im);
805 }
806
807 /* mark EXCLUDE-mode sources */
808 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
809 {
810 struct ip_sf_list *psf;
811 int i, scount;
812
813 scount = 0;
814 for (psf = pmc->sources; psf; psf = psf->sf_next) {
815 if (scount == nsrcs)
816 break;
817 for (i = 0; i < nsrcs; i++) {
818 /* skip inactive filters */
819 if (psf->sf_count[MCAST_INCLUDE] ||
820 pmc->sfcount[MCAST_EXCLUDE] !=
821 psf->sf_count[MCAST_EXCLUDE])
822 break;
823 if (srcs[i] == psf->sf_inaddr) {
824 scount++;
825 break;
826 }
827 }
828 }
829 pmc->gsquery = 0;
830 if (scount == nsrcs) /* all sources excluded */
831 return 0;
832 return 1;
833 }
834
835 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
836 {
837 struct ip_sf_list *psf;
838 int i, scount;
839
840 if (pmc->sfmode == MCAST_EXCLUDE)
841 return igmp_xmarksources(pmc, nsrcs, srcs);
842
843 /* mark INCLUDE-mode sources */
844 scount = 0;
845 for (psf = pmc->sources; psf; psf = psf->sf_next) {
846 if (scount == nsrcs)
847 break;
848 for (i = 0; i < nsrcs; i++)
849 if (srcs[i] == psf->sf_inaddr) {
850 psf->sf_gsresp = 1;
851 scount++;
852 break;
853 }
854 }
855 if (!scount) {
856 pmc->gsquery = 0;
857 return 0;
858 }
859 pmc->gsquery = 1;
860 return 1;
861 }
862
863 /* return true if packet was dropped */
864 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
865 {
866 struct ip_mc_list *im;
867 struct net *net = dev_net(in_dev->dev);
868
869 /* Timers are only set for non-local groups */
870
871 if (group == IGMP_ALL_HOSTS)
872 return false;
873 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
874 return false;
875
876 rcu_read_lock();
877 for_each_pmc_rcu(in_dev, im) {
878 if (im->multiaddr == group) {
879 igmp_stop_timer(im);
880 break;
881 }
882 }
883 rcu_read_unlock();
884 return false;
885 }
886
887 /* return true if packet was dropped */
888 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
889 int len)
890 {
891 struct igmphdr *ih = igmp_hdr(skb);
892 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
893 struct ip_mc_list *im;
894 __be32 group = ih->group;
895 int max_delay;
896 int mark = 0;
897 struct net *net = dev_net(in_dev->dev);
898
899
900 if (len == 8) {
901 if (ih->code == 0) {
902 /* Alas, old v1 router presents here. */
903
904 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
905 in_dev->mr_v1_seen = jiffies +
906 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
907 group = 0;
908 } else {
909 /* v2 router present */
910 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
911 in_dev->mr_v2_seen = jiffies +
912 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
913 }
914 /* cancel the interface change timer */
915 in_dev->mr_ifc_count = 0;
916 if (del_timer(&in_dev->mr_ifc_timer))
917 __in_dev_put(in_dev);
918 /* clear deleted report items */
919 igmpv3_clear_delrec(in_dev);
920 } else if (len < 12) {
921 return true; /* ignore bogus packet; freed by caller */
922 } else if (IGMP_V1_SEEN(in_dev)) {
923 /* This is a v3 query with v1 queriers present */
924 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
925 group = 0;
926 } else if (IGMP_V2_SEEN(in_dev)) {
927 /* this is a v3 query with v2 queriers present;
928 * Interpretation of the max_delay code is problematic here.
929 * A real v2 host would use ih_code directly, while v3 has a
930 * different encoding. We use the v3 encoding as more likely
931 * to be intended in a v3 query.
932 */
933 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
934 if (!max_delay)
935 max_delay = 1; /* can't mod w/ 0 */
936 } else { /* v3 */
937 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
938 return true;
939
940 ih3 = igmpv3_query_hdr(skb);
941 if (ih3->nsrcs) {
942 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
943 + ntohs(ih3->nsrcs)*sizeof(__be32)))
944 return true;
945 ih3 = igmpv3_query_hdr(skb);
946 }
947
948 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
949 if (!max_delay)
950 max_delay = 1; /* can't mod w/ 0 */
951 in_dev->mr_maxdelay = max_delay;
952 if (ih3->qrv)
953 in_dev->mr_qrv = ih3->qrv;
954 if (!group) { /* general query */
955 if (ih3->nsrcs)
956 return true; /* no sources allowed */
957 igmp_gq_start_timer(in_dev);
958 return false;
959 }
960 /* mark sources to include, if group & source-specific */
961 mark = ih3->nsrcs != 0;
962 }
963
964 /*
965 * - Start the timers in all of our membership records
966 * that the query applies to for the interface on
967 * which the query arrived excl. those that belong
968 * to a "local" group (224.0.0.X)
969 * - For timers already running check if they need to
970 * be reset.
971 * - Use the igmp->igmp_code field as the maximum
972 * delay possible
973 */
974 rcu_read_lock();
975 for_each_pmc_rcu(in_dev, im) {
976 int changed;
977
978 if (group && group != im->multiaddr)
979 continue;
980 if (im->multiaddr == IGMP_ALL_HOSTS)
981 continue;
982 if (ipv4_is_local_multicast(im->multiaddr) &&
983 !net->ipv4.sysctl_igmp_llm_reports)
984 continue;
985 spin_lock_bh(&im->lock);
986 if (im->tm_running)
987 im->gsquery = im->gsquery && mark;
988 else
989 im->gsquery = mark;
990 changed = !im->gsquery ||
991 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
992 spin_unlock_bh(&im->lock);
993 if (changed)
994 igmp_mod_timer(im, max_delay);
995 }
996 rcu_read_unlock();
997 return false;
998 }
999
1000 /* called in rcu_read_lock() section */
1001 int igmp_rcv(struct sk_buff *skb)
1002 {
1003 /* This basically follows the spec line by line -- see RFC1112 */
1004 struct igmphdr *ih;
1005 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1006 int len = skb->len;
1007 bool dropped = true;
1008
1009 if (!in_dev)
1010 goto drop;
1011
1012 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1013 goto drop;
1014
1015 if (skb_checksum_simple_validate(skb))
1016 goto drop;
1017
1018 ih = igmp_hdr(skb);
1019 switch (ih->type) {
1020 case IGMP_HOST_MEMBERSHIP_QUERY:
1021 dropped = igmp_heard_query(in_dev, skb, len);
1022 break;
1023 case IGMP_HOST_MEMBERSHIP_REPORT:
1024 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1025 /* Is it our report looped back? */
1026 if (rt_is_output_route(skb_rtable(skb)))
1027 break;
1028 /* don't rely on MC router hearing unicast reports */
1029 if (skb->pkt_type == PACKET_MULTICAST ||
1030 skb->pkt_type == PACKET_BROADCAST)
1031 dropped = igmp_heard_report(in_dev, ih->group);
1032 break;
1033 case IGMP_PIM:
1034 #ifdef CONFIG_IP_PIMSM_V1
1035 return pim_rcv_v1(skb);
1036 #endif
1037 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1038 case IGMP_DVMRP:
1039 case IGMP_TRACE:
1040 case IGMP_HOST_LEAVE_MESSAGE:
1041 case IGMP_MTRACE:
1042 case IGMP_MTRACE_RESP:
1043 break;
1044 default:
1045 break;
1046 }
1047
1048 drop:
1049 if (dropped)
1050 kfree_skb(skb);
1051 else
1052 consume_skb(skb);
1053 return 0;
1054 }
1055
1056 #endif
1057
1058
1059 /*
1060 * Add a filter to a device
1061 */
1062
1063 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1064 {
1065 char buf[MAX_ADDR_LEN];
1066 struct net_device *dev = in_dev->dev;
1067
1068 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1069 We will get multicast token leakage, when IFF_MULTICAST
1070 is changed. This check should be done in ndo_set_rx_mode
1071 routine. Something sort of:
1072 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1073 --ANK
1074 */
1075 if (arp_mc_map(addr, buf, dev, 0) == 0)
1076 dev_mc_add(dev, buf);
1077 }
1078
1079 /*
1080 * Remove a filter from a device
1081 */
1082
1083 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1084 {
1085 char buf[MAX_ADDR_LEN];
1086 struct net_device *dev = in_dev->dev;
1087
1088 if (arp_mc_map(addr, buf, dev, 0) == 0)
1089 dev_mc_del(dev, buf);
1090 }
1091
1092 #ifdef CONFIG_IP_MULTICAST
1093 /*
1094 * deleted ip_mc_list manipulation
1095 */
1096 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1097 {
1098 struct ip_mc_list *pmc;
1099 struct net *net = dev_net(in_dev->dev);
1100
1101 /* this is an "ip_mc_list" for convenience; only the fields below
1102 * are actually used. In particular, the refcnt and users are not
1103 * used for management of the delete list. Using the same structure
1104 * for deleted items allows change reports to use common code with
1105 * non-deleted or query-response MCA's.
1106 */
1107 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1108 if (!pmc)
1109 return;
1110 spin_lock_bh(&im->lock);
1111 pmc->interface = im->interface;
1112 in_dev_hold(in_dev);
1113 pmc->multiaddr = im->multiaddr;
1114 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1115 pmc->sfmode = im->sfmode;
1116 if (pmc->sfmode == MCAST_INCLUDE) {
1117 struct ip_sf_list *psf;
1118
1119 pmc->tomb = im->tomb;
1120 pmc->sources = im->sources;
1121 im->tomb = im->sources = NULL;
1122 for (psf = pmc->sources; psf; psf = psf->sf_next)
1123 psf->sf_crcount = pmc->crcount;
1124 }
1125 spin_unlock_bh(&im->lock);
1126
1127 spin_lock_bh(&in_dev->mc_tomb_lock);
1128 pmc->next = in_dev->mc_tomb;
1129 in_dev->mc_tomb = pmc;
1130 spin_unlock_bh(&in_dev->mc_tomb_lock);
1131 }
1132
1133 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1134 {
1135 struct ip_mc_list *pmc, *pmc_prev;
1136 struct ip_sf_list *psf, *psf_next;
1137
1138 spin_lock_bh(&in_dev->mc_tomb_lock);
1139 pmc_prev = NULL;
1140 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1141 if (pmc->multiaddr == multiaddr)
1142 break;
1143 pmc_prev = pmc;
1144 }
1145 if (pmc) {
1146 if (pmc_prev)
1147 pmc_prev->next = pmc->next;
1148 else
1149 in_dev->mc_tomb = pmc->next;
1150 }
1151 spin_unlock_bh(&in_dev->mc_tomb_lock);
1152 if (pmc) {
1153 for (psf = pmc->tomb; psf; psf = psf_next) {
1154 psf_next = psf->sf_next;
1155 kfree(psf);
1156 }
1157 in_dev_put(pmc->interface);
1158 kfree(pmc);
1159 }
1160 }
1161
1162 static void igmpv3_clear_delrec(struct in_device *in_dev)
1163 {
1164 struct ip_mc_list *pmc, *nextpmc;
1165
1166 spin_lock_bh(&in_dev->mc_tomb_lock);
1167 pmc = in_dev->mc_tomb;
1168 in_dev->mc_tomb = NULL;
1169 spin_unlock_bh(&in_dev->mc_tomb_lock);
1170
1171 for (; pmc; pmc = nextpmc) {
1172 nextpmc = pmc->next;
1173 ip_mc_clear_src(pmc);
1174 in_dev_put(pmc->interface);
1175 kfree(pmc);
1176 }
1177 /* clear dead sources, too */
1178 rcu_read_lock();
1179 for_each_pmc_rcu(in_dev, pmc) {
1180 struct ip_sf_list *psf, *psf_next;
1181
1182 spin_lock_bh(&pmc->lock);
1183 psf = pmc->tomb;
1184 pmc->tomb = NULL;
1185 spin_unlock_bh(&pmc->lock);
1186 for (; psf; psf = psf_next) {
1187 psf_next = psf->sf_next;
1188 kfree(psf);
1189 }
1190 }
1191 rcu_read_unlock();
1192 }
1193 #endif
1194
1195 static void igmp_group_dropped(struct ip_mc_list *im)
1196 {
1197 struct in_device *in_dev = im->interface;
1198 #ifdef CONFIG_IP_MULTICAST
1199 struct net *net = dev_net(in_dev->dev);
1200 int reporter;
1201 #endif
1202
1203 if (im->loaded) {
1204 im->loaded = 0;
1205 ip_mc_filter_del(in_dev, im->multiaddr);
1206 }
1207
1208 #ifdef CONFIG_IP_MULTICAST
1209 if (im->multiaddr == IGMP_ALL_HOSTS)
1210 return;
1211 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1212 return;
1213
1214 reporter = im->reporter;
1215 igmp_stop_timer(im);
1216
1217 if (!in_dev->dead) {
1218 if (IGMP_V1_SEEN(in_dev))
1219 return;
1220 if (IGMP_V2_SEEN(in_dev)) {
1221 if (reporter)
1222 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1223 return;
1224 }
1225 /* IGMPv3 */
1226 igmpv3_add_delrec(in_dev, im);
1227
1228 igmp_ifc_event(in_dev);
1229 }
1230 #endif
1231 }
1232
1233 static void igmp_group_added(struct ip_mc_list *im)
1234 {
1235 struct in_device *in_dev = im->interface;
1236 #ifdef CONFIG_IP_MULTICAST
1237 struct net *net = dev_net(in_dev->dev);
1238 #endif
1239
1240 if (im->loaded == 0) {
1241 im->loaded = 1;
1242 ip_mc_filter_add(in_dev, im->multiaddr);
1243 }
1244
1245 #ifdef CONFIG_IP_MULTICAST
1246 if (im->multiaddr == IGMP_ALL_HOSTS)
1247 return;
1248 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1249 return;
1250
1251 if (in_dev->dead)
1252 return;
1253 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1254 spin_lock_bh(&im->lock);
1255 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1256 spin_unlock_bh(&im->lock);
1257 return;
1258 }
1259 /* else, v3 */
1260
1261 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1262 igmp_ifc_event(in_dev);
1263 #endif
1264 }
1265
1266
1267 /*
1268 * Multicast list managers
1269 */
1270
1271 static u32 ip_mc_hash(const struct ip_mc_list *im)
1272 {
1273 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1274 }
1275
1276 static void ip_mc_hash_add(struct in_device *in_dev,
1277 struct ip_mc_list *im)
1278 {
1279 struct ip_mc_list __rcu **mc_hash;
1280 u32 hash;
1281
1282 mc_hash = rtnl_dereference(in_dev->mc_hash);
1283 if (mc_hash) {
1284 hash = ip_mc_hash(im);
1285 im->next_hash = mc_hash[hash];
1286 rcu_assign_pointer(mc_hash[hash], im);
1287 return;
1288 }
1289
1290 /* do not use a hash table for small number of items */
1291 if (in_dev->mc_count < 4)
1292 return;
1293
1294 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1295 GFP_KERNEL);
1296 if (!mc_hash)
1297 return;
1298
1299 for_each_pmc_rtnl(in_dev, im) {
1300 hash = ip_mc_hash(im);
1301 im->next_hash = mc_hash[hash];
1302 RCU_INIT_POINTER(mc_hash[hash], im);
1303 }
1304
1305 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1306 }
1307
1308 static void ip_mc_hash_remove(struct in_device *in_dev,
1309 struct ip_mc_list *im)
1310 {
1311 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1312 struct ip_mc_list *aux;
1313
1314 if (!mc_hash)
1315 return;
1316 mc_hash += ip_mc_hash(im);
1317 while ((aux = rtnl_dereference(*mc_hash)) != im)
1318 mc_hash = &aux->next_hash;
1319 *mc_hash = im->next_hash;
1320 }
1321
1322
1323 /*
1324 * A socket has joined a multicast group on device dev.
1325 */
1326
1327 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1328 {
1329 struct ip_mc_list *im;
1330 #ifdef CONFIG_IP_MULTICAST
1331 struct net *net = dev_net(in_dev->dev);
1332 #endif
1333
1334 ASSERT_RTNL();
1335
1336 for_each_pmc_rtnl(in_dev, im) {
1337 if (im->multiaddr == addr) {
1338 im->users++;
1339 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1340 goto out;
1341 }
1342 }
1343
1344 im = kzalloc(sizeof(*im), GFP_KERNEL);
1345 if (!im)
1346 goto out;
1347
1348 im->users = 1;
1349 im->interface = in_dev;
1350 in_dev_hold(in_dev);
1351 im->multiaddr = addr;
1352 /* initial mode is (EX, empty) */
1353 im->sfmode = MCAST_EXCLUDE;
1354 im->sfcount[MCAST_EXCLUDE] = 1;
1355 atomic_set(&im->refcnt, 1);
1356 spin_lock_init(&im->lock);
1357 #ifdef CONFIG_IP_MULTICAST
1358 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1359 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1360 #endif
1361
1362 im->next_rcu = in_dev->mc_list;
1363 in_dev->mc_count++;
1364 rcu_assign_pointer(in_dev->mc_list, im);
1365
1366 ip_mc_hash_add(in_dev, im);
1367
1368 #ifdef CONFIG_IP_MULTICAST
1369 igmpv3_del_delrec(in_dev, im->multiaddr);
1370 #endif
1371 igmp_group_added(im);
1372 if (!in_dev->dead)
1373 ip_rt_multicast_event(in_dev);
1374 out:
1375 return;
1376 }
1377 EXPORT_SYMBOL(ip_mc_inc_group);
1378
1379 static int ip_mc_check_iphdr(struct sk_buff *skb)
1380 {
1381 const struct iphdr *iph;
1382 unsigned int len;
1383 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1384
1385 if (!pskb_may_pull(skb, offset))
1386 return -EINVAL;
1387
1388 iph = ip_hdr(skb);
1389
1390 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1391 return -EINVAL;
1392
1393 offset += ip_hdrlen(skb) - sizeof(*iph);
1394
1395 if (!pskb_may_pull(skb, offset))
1396 return -EINVAL;
1397
1398 iph = ip_hdr(skb);
1399
1400 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1401 return -EINVAL;
1402
1403 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1404 if (skb->len < len || len < offset)
1405 return -EINVAL;
1406
1407 skb_set_transport_header(skb, offset);
1408
1409 return 0;
1410 }
1411
1412 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1413 {
1414 unsigned int len = skb_transport_offset(skb);
1415
1416 len += sizeof(struct igmpv3_report);
1417
1418 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1419 }
1420
1421 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1422 {
1423 unsigned int len = skb_transport_offset(skb);
1424
1425 len += sizeof(struct igmphdr);
1426 if (skb->len < len)
1427 return -EINVAL;
1428
1429 /* IGMPv{1,2}? */
1430 if (skb->len != len) {
1431 /* or IGMPv3? */
1432 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1433 if (skb->len < len || !pskb_may_pull(skb, len))
1434 return -EINVAL;
1435 }
1436
1437 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1438 * all-systems destination addresses (224.0.0.1) for general queries
1439 */
1440 if (!igmp_hdr(skb)->group &&
1441 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1442 return -EINVAL;
1443
1444 return 0;
1445 }
1446
1447 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1448 {
1449 switch (igmp_hdr(skb)->type) {
1450 case IGMP_HOST_LEAVE_MESSAGE:
1451 case IGMP_HOST_MEMBERSHIP_REPORT:
1452 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1453 /* fall through */
1454 return 0;
1455 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1456 return ip_mc_check_igmp_reportv3(skb);
1457 case IGMP_HOST_MEMBERSHIP_QUERY:
1458 return ip_mc_check_igmp_query(skb);
1459 default:
1460 return -ENOMSG;
1461 }
1462 }
1463
1464 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1465 {
1466 return skb_checksum_simple_validate(skb);
1467 }
1468
1469 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1470
1471 {
1472 struct sk_buff *skb_chk;
1473 unsigned int transport_len;
1474 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1475 int ret = -EINVAL;
1476
1477 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1478
1479 skb_chk = skb_checksum_trimmed(skb, transport_len,
1480 ip_mc_validate_checksum);
1481 if (!skb_chk)
1482 goto err;
1483
1484 if (!pskb_may_pull(skb_chk, len))
1485 goto err;
1486
1487 ret = ip_mc_check_igmp_msg(skb_chk);
1488 if (ret)
1489 goto err;
1490
1491 if (skb_trimmed)
1492 *skb_trimmed = skb_chk;
1493 /* free now unneeded clone */
1494 else if (skb_chk != skb)
1495 kfree_skb(skb_chk);
1496
1497 ret = 0;
1498
1499 err:
1500 if (ret && skb_chk && skb_chk != skb)
1501 kfree_skb(skb_chk);
1502
1503 return ret;
1504 }
1505
1506 /**
1507 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1508 * @skb: the skb to validate
1509 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1510 *
1511 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1512 * skb transport header accordingly and returns zero.
1513 *
1514 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1515 * standard
1516 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1517 * -ENOMEM: A memory allocation failure happened.
1518 *
1519 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1520 * to NULL): After parsing an IGMP packet successfully it will point to
1521 * an skb which has its tail aligned to the IP packet end. This might
1522 * either be the originally provided skb or a trimmed, cloned version if
1523 * the skb frame had data beyond the IP packet. A cloned skb allows us
1524 * to leave the original skb and its full frame unchanged (which might be
1525 * desirable for layer 2 frame jugglers).
1526 *
1527 * Caller needs to set the skb network header and free any returned skb if it
1528 * differs from the provided skb.
1529 */
1530 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1531 {
1532 int ret = ip_mc_check_iphdr(skb);
1533
1534 if (ret < 0)
1535 return ret;
1536
1537 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1538 return -ENOMSG;
1539
1540 return __ip_mc_check_igmp(skb, skb_trimmed);
1541 }
1542 EXPORT_SYMBOL(ip_mc_check_igmp);
1543
1544 /*
1545 * Resend IGMP JOIN report; used by netdev notifier.
1546 */
1547 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1548 {
1549 #ifdef CONFIG_IP_MULTICAST
1550 struct ip_mc_list *im;
1551 int type;
1552 struct net *net = dev_net(in_dev->dev);
1553
1554 ASSERT_RTNL();
1555
1556 for_each_pmc_rtnl(in_dev, im) {
1557 if (im->multiaddr == IGMP_ALL_HOSTS)
1558 continue;
1559 if (ipv4_is_local_multicast(im->multiaddr) &&
1560 !net->ipv4.sysctl_igmp_llm_reports)
1561 continue;
1562
1563 /* a failover is happening and switches
1564 * must be notified immediately
1565 */
1566 if (IGMP_V1_SEEN(in_dev))
1567 type = IGMP_HOST_MEMBERSHIP_REPORT;
1568 else if (IGMP_V2_SEEN(in_dev))
1569 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1570 else
1571 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1572 igmp_send_report(in_dev, im, type);
1573 }
1574 #endif
1575 }
1576
1577 /*
1578 * A socket has left a multicast group on device dev
1579 */
1580
1581 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1582 {
1583 struct ip_mc_list *i;
1584 struct ip_mc_list __rcu **ip;
1585
1586 ASSERT_RTNL();
1587
1588 for (ip = &in_dev->mc_list;
1589 (i = rtnl_dereference(*ip)) != NULL;
1590 ip = &i->next_rcu) {
1591 if (i->multiaddr == addr) {
1592 if (--i->users == 0) {
1593 ip_mc_hash_remove(in_dev, i);
1594 *ip = i->next_rcu;
1595 in_dev->mc_count--;
1596 igmp_group_dropped(i);
1597 ip_mc_clear_src(i);
1598
1599 if (!in_dev->dead)
1600 ip_rt_multicast_event(in_dev);
1601
1602 ip_ma_put(i);
1603 return;
1604 }
1605 break;
1606 }
1607 }
1608 }
1609 EXPORT_SYMBOL(ip_mc_dec_group);
1610
1611 /* Device changing type */
1612
1613 void ip_mc_unmap(struct in_device *in_dev)
1614 {
1615 struct ip_mc_list *pmc;
1616
1617 ASSERT_RTNL();
1618
1619 for_each_pmc_rtnl(in_dev, pmc)
1620 igmp_group_dropped(pmc);
1621 }
1622
1623 void ip_mc_remap(struct in_device *in_dev)
1624 {
1625 struct ip_mc_list *pmc;
1626
1627 ASSERT_RTNL();
1628
1629 for_each_pmc_rtnl(in_dev, pmc)
1630 igmp_group_added(pmc);
1631 }
1632
1633 /* Device going down */
1634
1635 void ip_mc_down(struct in_device *in_dev)
1636 {
1637 struct ip_mc_list *pmc;
1638
1639 ASSERT_RTNL();
1640
1641 for_each_pmc_rtnl(in_dev, pmc)
1642 igmp_group_dropped(pmc);
1643
1644 #ifdef CONFIG_IP_MULTICAST
1645 in_dev->mr_ifc_count = 0;
1646 if (del_timer(&in_dev->mr_ifc_timer))
1647 __in_dev_put(in_dev);
1648 in_dev->mr_gq_running = 0;
1649 if (del_timer(&in_dev->mr_gq_timer))
1650 __in_dev_put(in_dev);
1651 igmpv3_clear_delrec(in_dev);
1652 #endif
1653
1654 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1655 }
1656
1657 void ip_mc_init_dev(struct in_device *in_dev)
1658 {
1659 #ifdef CONFIG_IP_MULTICAST
1660 struct net *net = dev_net(in_dev->dev);
1661 #endif
1662 ASSERT_RTNL();
1663
1664 #ifdef CONFIG_IP_MULTICAST
1665 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1666 (unsigned long)in_dev);
1667 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1668 (unsigned long)in_dev);
1669 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1670 #endif
1671
1672 spin_lock_init(&in_dev->mc_tomb_lock);
1673 }
1674
1675 /* Device going up */
1676
1677 void ip_mc_up(struct in_device *in_dev)
1678 {
1679 struct ip_mc_list *pmc;
1680 #ifdef CONFIG_IP_MULTICAST
1681 struct net *net = dev_net(in_dev->dev);
1682 #endif
1683
1684 ASSERT_RTNL();
1685
1686 #ifdef CONFIG_IP_MULTICAST
1687 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1688 #endif
1689 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1690
1691 for_each_pmc_rtnl(in_dev, pmc)
1692 igmp_group_added(pmc);
1693 }
1694
1695 /*
1696 * Device is about to be destroyed: clean up.
1697 */
1698
1699 void ip_mc_destroy_dev(struct in_device *in_dev)
1700 {
1701 struct ip_mc_list *i;
1702
1703 ASSERT_RTNL();
1704
1705 /* Deactivate timers */
1706 ip_mc_down(in_dev);
1707
1708 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1709 in_dev->mc_list = i->next_rcu;
1710 in_dev->mc_count--;
1711
1712 /* We've dropped the groups in ip_mc_down already */
1713 ip_mc_clear_src(i);
1714 ip_ma_put(i);
1715 }
1716 }
1717
1718 /* RTNL is locked */
1719 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1720 {
1721 struct net_device *dev = NULL;
1722 struct in_device *idev = NULL;
1723
1724 if (imr->imr_ifindex) {
1725 idev = inetdev_by_index(net, imr->imr_ifindex);
1726 return idev;
1727 }
1728 if (imr->imr_address.s_addr) {
1729 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1730 if (!dev)
1731 return NULL;
1732 }
1733
1734 if (!dev) {
1735 struct rtable *rt = ip_route_output(net,
1736 imr->imr_multiaddr.s_addr,
1737 0, 0, 0);
1738 if (!IS_ERR(rt)) {
1739 dev = rt->dst.dev;
1740 ip_rt_put(rt);
1741 }
1742 }
1743 if (dev) {
1744 imr->imr_ifindex = dev->ifindex;
1745 idev = __in_dev_get_rtnl(dev);
1746 }
1747 return idev;
1748 }
1749
1750 /*
1751 * Join a socket to a group
1752 */
1753
1754 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1755 __be32 *psfsrc)
1756 {
1757 struct ip_sf_list *psf, *psf_prev;
1758 int rv = 0;
1759
1760 psf_prev = NULL;
1761 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1762 if (psf->sf_inaddr == *psfsrc)
1763 break;
1764 psf_prev = psf;
1765 }
1766 if (!psf || psf->sf_count[sfmode] == 0) {
1767 /* source filter not found, or count wrong => bug */
1768 return -ESRCH;
1769 }
1770 psf->sf_count[sfmode]--;
1771 if (psf->sf_count[sfmode] == 0) {
1772 ip_rt_multicast_event(pmc->interface);
1773 }
1774 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1775 #ifdef CONFIG_IP_MULTICAST
1776 struct in_device *in_dev = pmc->interface;
1777 struct net *net = dev_net(in_dev->dev);
1778 #endif
1779
1780 /* no more filters for this source */
1781 if (psf_prev)
1782 psf_prev->sf_next = psf->sf_next;
1783 else
1784 pmc->sources = psf->sf_next;
1785 #ifdef CONFIG_IP_MULTICAST
1786 if (psf->sf_oldin &&
1787 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1788 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1789 psf->sf_next = pmc->tomb;
1790 pmc->tomb = psf;
1791 rv = 1;
1792 } else
1793 #endif
1794 kfree(psf);
1795 }
1796 return rv;
1797 }
1798
1799 #ifndef CONFIG_IP_MULTICAST
1800 #define igmp_ifc_event(x) do { } while (0)
1801 #endif
1802
1803 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1804 int sfcount, __be32 *psfsrc, int delta)
1805 {
1806 struct ip_mc_list *pmc;
1807 int changerec = 0;
1808 int i, err;
1809
1810 if (!in_dev)
1811 return -ENODEV;
1812 rcu_read_lock();
1813 for_each_pmc_rcu(in_dev, pmc) {
1814 if (*pmca == pmc->multiaddr)
1815 break;
1816 }
1817 if (!pmc) {
1818 /* MCA not found?? bug */
1819 rcu_read_unlock();
1820 return -ESRCH;
1821 }
1822 spin_lock_bh(&pmc->lock);
1823 rcu_read_unlock();
1824 #ifdef CONFIG_IP_MULTICAST
1825 sf_markstate(pmc);
1826 #endif
1827 if (!delta) {
1828 err = -EINVAL;
1829 if (!pmc->sfcount[sfmode])
1830 goto out_unlock;
1831 pmc->sfcount[sfmode]--;
1832 }
1833 err = 0;
1834 for (i = 0; i < sfcount; i++) {
1835 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1836
1837 changerec |= rv > 0;
1838 if (!err && rv < 0)
1839 err = rv;
1840 }
1841 if (pmc->sfmode == MCAST_EXCLUDE &&
1842 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1843 pmc->sfcount[MCAST_INCLUDE]) {
1844 #ifdef CONFIG_IP_MULTICAST
1845 struct ip_sf_list *psf;
1846 struct net *net = dev_net(in_dev->dev);
1847 #endif
1848
1849 /* filter mode change */
1850 pmc->sfmode = MCAST_INCLUDE;
1851 #ifdef CONFIG_IP_MULTICAST
1852 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1853 in_dev->mr_ifc_count = pmc->crcount;
1854 for (psf = pmc->sources; psf; psf = psf->sf_next)
1855 psf->sf_crcount = 0;
1856 igmp_ifc_event(pmc->interface);
1857 } else if (sf_setstate(pmc) || changerec) {
1858 igmp_ifc_event(pmc->interface);
1859 #endif
1860 }
1861 out_unlock:
1862 spin_unlock_bh(&pmc->lock);
1863 return err;
1864 }
1865
1866 /*
1867 * Add multicast single-source filter to the interface list
1868 */
1869 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1870 __be32 *psfsrc)
1871 {
1872 struct ip_sf_list *psf, *psf_prev;
1873
1874 psf_prev = NULL;
1875 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1876 if (psf->sf_inaddr == *psfsrc)
1877 break;
1878 psf_prev = psf;
1879 }
1880 if (!psf) {
1881 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1882 if (!psf)
1883 return -ENOBUFS;
1884 psf->sf_inaddr = *psfsrc;
1885 if (psf_prev) {
1886 psf_prev->sf_next = psf;
1887 } else
1888 pmc->sources = psf;
1889 }
1890 psf->sf_count[sfmode]++;
1891 if (psf->sf_count[sfmode] == 1) {
1892 ip_rt_multicast_event(pmc->interface);
1893 }
1894 return 0;
1895 }
1896
1897 #ifdef CONFIG_IP_MULTICAST
1898 static void sf_markstate(struct ip_mc_list *pmc)
1899 {
1900 struct ip_sf_list *psf;
1901 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1902
1903 for (psf = pmc->sources; psf; psf = psf->sf_next)
1904 if (pmc->sfcount[MCAST_EXCLUDE]) {
1905 psf->sf_oldin = mca_xcount ==
1906 psf->sf_count[MCAST_EXCLUDE] &&
1907 !psf->sf_count[MCAST_INCLUDE];
1908 } else
1909 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1910 }
1911
1912 static int sf_setstate(struct ip_mc_list *pmc)
1913 {
1914 struct ip_sf_list *psf, *dpsf;
1915 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1916 int qrv = pmc->interface->mr_qrv;
1917 int new_in, rv;
1918
1919 rv = 0;
1920 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1921 if (pmc->sfcount[MCAST_EXCLUDE]) {
1922 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1923 !psf->sf_count[MCAST_INCLUDE];
1924 } else
1925 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1926 if (new_in) {
1927 if (!psf->sf_oldin) {
1928 struct ip_sf_list *prev = NULL;
1929
1930 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1931 if (dpsf->sf_inaddr == psf->sf_inaddr)
1932 break;
1933 prev = dpsf;
1934 }
1935 if (dpsf) {
1936 if (prev)
1937 prev->sf_next = dpsf->sf_next;
1938 else
1939 pmc->tomb = dpsf->sf_next;
1940 kfree(dpsf);
1941 }
1942 psf->sf_crcount = qrv;
1943 rv++;
1944 }
1945 } else if (psf->sf_oldin) {
1946
1947 psf->sf_crcount = 0;
1948 /*
1949 * add or update "delete" records if an active filter
1950 * is now inactive
1951 */
1952 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1953 if (dpsf->sf_inaddr == psf->sf_inaddr)
1954 break;
1955 if (!dpsf) {
1956 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1957 if (!dpsf)
1958 continue;
1959 *dpsf = *psf;
1960 /* pmc->lock held by callers */
1961 dpsf->sf_next = pmc->tomb;
1962 pmc->tomb = dpsf;
1963 }
1964 dpsf->sf_crcount = qrv;
1965 rv++;
1966 }
1967 }
1968 return rv;
1969 }
1970 #endif
1971
1972 /*
1973 * Add multicast source filter list to the interface list
1974 */
1975 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1976 int sfcount, __be32 *psfsrc, int delta)
1977 {
1978 struct ip_mc_list *pmc;
1979 int isexclude;
1980 int i, err;
1981
1982 if (!in_dev)
1983 return -ENODEV;
1984 rcu_read_lock();
1985 for_each_pmc_rcu(in_dev, pmc) {
1986 if (*pmca == pmc->multiaddr)
1987 break;
1988 }
1989 if (!pmc) {
1990 /* MCA not found?? bug */
1991 rcu_read_unlock();
1992 return -ESRCH;
1993 }
1994 spin_lock_bh(&pmc->lock);
1995 rcu_read_unlock();
1996
1997 #ifdef CONFIG_IP_MULTICAST
1998 sf_markstate(pmc);
1999 #endif
2000 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2001 if (!delta)
2002 pmc->sfcount[sfmode]++;
2003 err = 0;
2004 for (i = 0; i < sfcount; i++) {
2005 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2006 if (err)
2007 break;
2008 }
2009 if (err) {
2010 int j;
2011
2012 if (!delta)
2013 pmc->sfcount[sfmode]--;
2014 for (j = 0; j < i; j++)
2015 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2016 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2017 #ifdef CONFIG_IP_MULTICAST
2018 struct ip_sf_list *psf;
2019 struct net *net = dev_net(pmc->interface->dev);
2020 in_dev = pmc->interface;
2021 #endif
2022
2023 /* filter mode change */
2024 if (pmc->sfcount[MCAST_EXCLUDE])
2025 pmc->sfmode = MCAST_EXCLUDE;
2026 else if (pmc->sfcount[MCAST_INCLUDE])
2027 pmc->sfmode = MCAST_INCLUDE;
2028 #ifdef CONFIG_IP_MULTICAST
2029 /* else no filters; keep old mode for reports */
2030
2031 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2032 in_dev->mr_ifc_count = pmc->crcount;
2033 for (psf = pmc->sources; psf; psf = psf->sf_next)
2034 psf->sf_crcount = 0;
2035 igmp_ifc_event(in_dev);
2036 } else if (sf_setstate(pmc)) {
2037 igmp_ifc_event(in_dev);
2038 #endif
2039 }
2040 spin_unlock_bh(&pmc->lock);
2041 return err;
2042 }
2043
2044 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2045 {
2046 struct ip_sf_list *psf, *nextpsf;
2047
2048 for (psf = pmc->tomb; psf; psf = nextpsf) {
2049 nextpsf = psf->sf_next;
2050 kfree(psf);
2051 }
2052 pmc->tomb = NULL;
2053 for (psf = pmc->sources; psf; psf = nextpsf) {
2054 nextpsf = psf->sf_next;
2055 kfree(psf);
2056 }
2057 pmc->sources = NULL;
2058 pmc->sfmode = MCAST_EXCLUDE;
2059 pmc->sfcount[MCAST_INCLUDE] = 0;
2060 pmc->sfcount[MCAST_EXCLUDE] = 1;
2061 }
2062
2063 /* Join a multicast group
2064 */
2065
2066 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2067 {
2068 __be32 addr = imr->imr_multiaddr.s_addr;
2069 struct ip_mc_socklist *iml, *i;
2070 struct in_device *in_dev;
2071 struct inet_sock *inet = inet_sk(sk);
2072 struct net *net = sock_net(sk);
2073 int ifindex;
2074 int count = 0;
2075 int err;
2076
2077 ASSERT_RTNL();
2078
2079 if (!ipv4_is_multicast(addr))
2080 return -EINVAL;
2081
2082 in_dev = ip_mc_find_dev(net, imr);
2083
2084 if (!in_dev) {
2085 err = -ENODEV;
2086 goto done;
2087 }
2088
2089 err = -EADDRINUSE;
2090 ifindex = imr->imr_ifindex;
2091 for_each_pmc_rtnl(inet, i) {
2092 if (i->multi.imr_multiaddr.s_addr == addr &&
2093 i->multi.imr_ifindex == ifindex)
2094 goto done;
2095 count++;
2096 }
2097 err = -ENOBUFS;
2098 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2099 goto done;
2100 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2101 if (!iml)
2102 goto done;
2103
2104 memcpy(&iml->multi, imr, sizeof(*imr));
2105 iml->next_rcu = inet->mc_list;
2106 iml->sflist = NULL;
2107 iml->sfmode = MCAST_EXCLUDE;
2108 rcu_assign_pointer(inet->mc_list, iml);
2109 ip_mc_inc_group(in_dev, addr);
2110 err = 0;
2111 done:
2112 return err;
2113 }
2114 EXPORT_SYMBOL(ip_mc_join_group);
2115
2116 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2117 struct in_device *in_dev)
2118 {
2119 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2120 int err;
2121
2122 if (!psf) {
2123 /* any-source empty exclude case */
2124 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2125 iml->sfmode, 0, NULL, 0);
2126 }
2127 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2128 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2129 RCU_INIT_POINTER(iml->sflist, NULL);
2130 /* decrease mem now to avoid the memleak warning */
2131 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2132 kfree_rcu(psf, rcu);
2133 return err;
2134 }
2135
2136 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2137 {
2138 struct inet_sock *inet = inet_sk(sk);
2139 struct ip_mc_socklist *iml;
2140 struct ip_mc_socklist __rcu **imlp;
2141 struct in_device *in_dev;
2142 struct net *net = sock_net(sk);
2143 __be32 group = imr->imr_multiaddr.s_addr;
2144 u32 ifindex;
2145 int ret = -EADDRNOTAVAIL;
2146
2147 ASSERT_RTNL();
2148
2149 in_dev = ip_mc_find_dev(net, imr);
2150 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2151 ret = -ENODEV;
2152 goto out;
2153 }
2154 ifindex = imr->imr_ifindex;
2155 for (imlp = &inet->mc_list;
2156 (iml = rtnl_dereference(*imlp)) != NULL;
2157 imlp = &iml->next_rcu) {
2158 if (iml->multi.imr_multiaddr.s_addr != group)
2159 continue;
2160 if (ifindex) {
2161 if (iml->multi.imr_ifindex != ifindex)
2162 continue;
2163 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2164 iml->multi.imr_address.s_addr)
2165 continue;
2166
2167 (void) ip_mc_leave_src(sk, iml, in_dev);
2168
2169 *imlp = iml->next_rcu;
2170
2171 if (in_dev)
2172 ip_mc_dec_group(in_dev, group);
2173
2174 /* decrease mem now to avoid the memleak warning */
2175 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2176 kfree_rcu(iml, rcu);
2177 return 0;
2178 }
2179 out:
2180 return ret;
2181 }
2182 EXPORT_SYMBOL(ip_mc_leave_group);
2183
2184 int ip_mc_source(int add, int omode, struct sock *sk, struct
2185 ip_mreq_source *mreqs, int ifindex)
2186 {
2187 int err;
2188 struct ip_mreqn imr;
2189 __be32 addr = mreqs->imr_multiaddr;
2190 struct ip_mc_socklist *pmc;
2191 struct in_device *in_dev = NULL;
2192 struct inet_sock *inet = inet_sk(sk);
2193 struct ip_sf_socklist *psl;
2194 struct net *net = sock_net(sk);
2195 int leavegroup = 0;
2196 int i, j, rv;
2197
2198 if (!ipv4_is_multicast(addr))
2199 return -EINVAL;
2200
2201 ASSERT_RTNL();
2202
2203 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2204 imr.imr_address.s_addr = mreqs->imr_interface;
2205 imr.imr_ifindex = ifindex;
2206 in_dev = ip_mc_find_dev(net, &imr);
2207
2208 if (!in_dev) {
2209 err = -ENODEV;
2210 goto done;
2211 }
2212 err = -EADDRNOTAVAIL;
2213
2214 for_each_pmc_rtnl(inet, pmc) {
2215 if ((pmc->multi.imr_multiaddr.s_addr ==
2216 imr.imr_multiaddr.s_addr) &&
2217 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2218 break;
2219 }
2220 if (!pmc) { /* must have a prior join */
2221 err = -EINVAL;
2222 goto done;
2223 }
2224 /* if a source filter was set, must be the same mode as before */
2225 if (pmc->sflist) {
2226 if (pmc->sfmode != omode) {
2227 err = -EINVAL;
2228 goto done;
2229 }
2230 } else if (pmc->sfmode != omode) {
2231 /* allow mode switches for empty-set filters */
2232 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2233 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2234 NULL, 0);
2235 pmc->sfmode = omode;
2236 }
2237
2238 psl = rtnl_dereference(pmc->sflist);
2239 if (!add) {
2240 if (!psl)
2241 goto done; /* err = -EADDRNOTAVAIL */
2242 rv = !0;
2243 for (i = 0; i < psl->sl_count; i++) {
2244 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2245 sizeof(__be32));
2246 if (rv == 0)
2247 break;
2248 }
2249 if (rv) /* source not found */
2250 goto done; /* err = -EADDRNOTAVAIL */
2251
2252 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2253 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2254 leavegroup = 1;
2255 goto done;
2256 }
2257
2258 /* update the interface filter */
2259 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2260 &mreqs->imr_sourceaddr, 1);
2261
2262 for (j = i+1; j < psl->sl_count; j++)
2263 psl->sl_addr[j-1] = psl->sl_addr[j];
2264 psl->sl_count--;
2265 err = 0;
2266 goto done;
2267 }
2268 /* else, add a new source to the filter */
2269
2270 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2271 err = -ENOBUFS;
2272 goto done;
2273 }
2274 if (!psl || psl->sl_count == psl->sl_max) {
2275 struct ip_sf_socklist *newpsl;
2276 int count = IP_SFBLOCK;
2277
2278 if (psl)
2279 count += psl->sl_max;
2280 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2281 if (!newpsl) {
2282 err = -ENOBUFS;
2283 goto done;
2284 }
2285 newpsl->sl_max = count;
2286 newpsl->sl_count = count - IP_SFBLOCK;
2287 if (psl) {
2288 for (i = 0; i < psl->sl_count; i++)
2289 newpsl->sl_addr[i] = psl->sl_addr[i];
2290 /* decrease mem now to avoid the memleak warning */
2291 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2292 kfree_rcu(psl, rcu);
2293 }
2294 rcu_assign_pointer(pmc->sflist, newpsl);
2295 psl = newpsl;
2296 }
2297 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2298 for (i = 0; i < psl->sl_count; i++) {
2299 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2300 sizeof(__be32));
2301 if (rv == 0)
2302 break;
2303 }
2304 if (rv == 0) /* address already there is an error */
2305 goto done;
2306 for (j = psl->sl_count-1; j >= i; j--)
2307 psl->sl_addr[j+1] = psl->sl_addr[j];
2308 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2309 psl->sl_count++;
2310 err = 0;
2311 /* update the interface list */
2312 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2313 &mreqs->imr_sourceaddr, 1);
2314 done:
2315 if (leavegroup)
2316 err = ip_mc_leave_group(sk, &imr);
2317 return err;
2318 }
2319
2320 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2321 {
2322 int err = 0;
2323 struct ip_mreqn imr;
2324 __be32 addr = msf->imsf_multiaddr;
2325 struct ip_mc_socklist *pmc;
2326 struct in_device *in_dev;
2327 struct inet_sock *inet = inet_sk(sk);
2328 struct ip_sf_socklist *newpsl, *psl;
2329 struct net *net = sock_net(sk);
2330 int leavegroup = 0;
2331
2332 if (!ipv4_is_multicast(addr))
2333 return -EINVAL;
2334 if (msf->imsf_fmode != MCAST_INCLUDE &&
2335 msf->imsf_fmode != MCAST_EXCLUDE)
2336 return -EINVAL;
2337
2338 ASSERT_RTNL();
2339
2340 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2341 imr.imr_address.s_addr = msf->imsf_interface;
2342 imr.imr_ifindex = ifindex;
2343 in_dev = ip_mc_find_dev(net, &imr);
2344
2345 if (!in_dev) {
2346 err = -ENODEV;
2347 goto done;
2348 }
2349
2350 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2351 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2352 leavegroup = 1;
2353 goto done;
2354 }
2355
2356 for_each_pmc_rtnl(inet, pmc) {
2357 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2358 pmc->multi.imr_ifindex == imr.imr_ifindex)
2359 break;
2360 }
2361 if (!pmc) { /* must have a prior join */
2362 err = -EINVAL;
2363 goto done;
2364 }
2365 if (msf->imsf_numsrc) {
2366 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2367 GFP_KERNEL);
2368 if (!newpsl) {
2369 err = -ENOBUFS;
2370 goto done;
2371 }
2372 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2373 memcpy(newpsl->sl_addr, msf->imsf_slist,
2374 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2375 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2376 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2377 if (err) {
2378 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2379 goto done;
2380 }
2381 } else {
2382 newpsl = NULL;
2383 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2384 msf->imsf_fmode, 0, NULL, 0);
2385 }
2386 psl = rtnl_dereference(pmc->sflist);
2387 if (psl) {
2388 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2389 psl->sl_count, psl->sl_addr, 0);
2390 /* decrease mem now to avoid the memleak warning */
2391 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2392 kfree_rcu(psl, rcu);
2393 } else
2394 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2395 0, NULL, 0);
2396 rcu_assign_pointer(pmc->sflist, newpsl);
2397 pmc->sfmode = msf->imsf_fmode;
2398 err = 0;
2399 done:
2400 if (leavegroup)
2401 err = ip_mc_leave_group(sk, &imr);
2402 return err;
2403 }
2404
2405 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2406 struct ip_msfilter __user *optval, int __user *optlen)
2407 {
2408 int err, len, count, copycount;
2409 struct ip_mreqn imr;
2410 __be32 addr = msf->imsf_multiaddr;
2411 struct ip_mc_socklist *pmc;
2412 struct in_device *in_dev;
2413 struct inet_sock *inet = inet_sk(sk);
2414 struct ip_sf_socklist *psl;
2415 struct net *net = sock_net(sk);
2416
2417 ASSERT_RTNL();
2418
2419 if (!ipv4_is_multicast(addr))
2420 return -EINVAL;
2421
2422 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2423 imr.imr_address.s_addr = msf->imsf_interface;
2424 imr.imr_ifindex = 0;
2425 in_dev = ip_mc_find_dev(net, &imr);
2426
2427 if (!in_dev) {
2428 err = -ENODEV;
2429 goto done;
2430 }
2431 err = -EADDRNOTAVAIL;
2432
2433 for_each_pmc_rtnl(inet, pmc) {
2434 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2435 pmc->multi.imr_ifindex == imr.imr_ifindex)
2436 break;
2437 }
2438 if (!pmc) /* must have a prior join */
2439 goto done;
2440 msf->imsf_fmode = pmc->sfmode;
2441 psl = rtnl_dereference(pmc->sflist);
2442 if (!psl) {
2443 len = 0;
2444 count = 0;
2445 } else {
2446 count = psl->sl_count;
2447 }
2448 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2449 len = copycount * sizeof(psl->sl_addr[0]);
2450 msf->imsf_numsrc = count;
2451 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2452 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2453 return -EFAULT;
2454 }
2455 if (len &&
2456 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2457 return -EFAULT;
2458 return 0;
2459 done:
2460 return err;
2461 }
2462
2463 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2464 struct group_filter __user *optval, int __user *optlen)
2465 {
2466 int err, i, count, copycount;
2467 struct sockaddr_in *psin;
2468 __be32 addr;
2469 struct ip_mc_socklist *pmc;
2470 struct inet_sock *inet = inet_sk(sk);
2471 struct ip_sf_socklist *psl;
2472
2473 ASSERT_RTNL();
2474
2475 psin = (struct sockaddr_in *)&gsf->gf_group;
2476 if (psin->sin_family != AF_INET)
2477 return -EINVAL;
2478 addr = psin->sin_addr.s_addr;
2479 if (!ipv4_is_multicast(addr))
2480 return -EINVAL;
2481
2482 err = -EADDRNOTAVAIL;
2483
2484 for_each_pmc_rtnl(inet, pmc) {
2485 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2486 pmc->multi.imr_ifindex == gsf->gf_interface)
2487 break;
2488 }
2489 if (!pmc) /* must have a prior join */
2490 goto done;
2491 gsf->gf_fmode = pmc->sfmode;
2492 psl = rtnl_dereference(pmc->sflist);
2493 count = psl ? psl->sl_count : 0;
2494 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2495 gsf->gf_numsrc = count;
2496 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2497 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2498 return -EFAULT;
2499 }
2500 for (i = 0; i < copycount; i++) {
2501 struct sockaddr_storage ss;
2502
2503 psin = (struct sockaddr_in *)&ss;
2504 memset(&ss, 0, sizeof(ss));
2505 psin->sin_family = AF_INET;
2506 psin->sin_addr.s_addr = psl->sl_addr[i];
2507 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2508 return -EFAULT;
2509 }
2510 return 0;
2511 done:
2512 return err;
2513 }
2514
2515 /*
2516 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2517 */
2518 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2519 {
2520 struct inet_sock *inet = inet_sk(sk);
2521 struct ip_mc_socklist *pmc;
2522 struct ip_sf_socklist *psl;
2523 int i;
2524 int ret;
2525
2526 ret = 1;
2527 if (!ipv4_is_multicast(loc_addr))
2528 goto out;
2529
2530 rcu_read_lock();
2531 for_each_pmc_rcu(inet, pmc) {
2532 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2533 pmc->multi.imr_ifindex == dif)
2534 break;
2535 }
2536 ret = inet->mc_all;
2537 if (!pmc)
2538 goto unlock;
2539 psl = rcu_dereference(pmc->sflist);
2540 ret = (pmc->sfmode == MCAST_EXCLUDE);
2541 if (!psl)
2542 goto unlock;
2543
2544 for (i = 0; i < psl->sl_count; i++) {
2545 if (psl->sl_addr[i] == rmt_addr)
2546 break;
2547 }
2548 ret = 0;
2549 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2550 goto unlock;
2551 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2552 goto unlock;
2553 ret = 1;
2554 unlock:
2555 rcu_read_unlock();
2556 out:
2557 return ret;
2558 }
2559
2560 /*
2561 * A socket is closing.
2562 */
2563
2564 void ip_mc_drop_socket(struct sock *sk)
2565 {
2566 struct inet_sock *inet = inet_sk(sk);
2567 struct ip_mc_socklist *iml;
2568 struct net *net = sock_net(sk);
2569
2570 if (!inet->mc_list)
2571 return;
2572
2573 rtnl_lock();
2574 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2575 struct in_device *in_dev;
2576
2577 inet->mc_list = iml->next_rcu;
2578 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2579 (void) ip_mc_leave_src(sk, iml, in_dev);
2580 if (in_dev)
2581 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2582 /* decrease mem now to avoid the memleak warning */
2583 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2584 kfree_rcu(iml, rcu);
2585 }
2586 rtnl_unlock();
2587 }
2588
2589 /* called with rcu_read_lock() */
2590 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2591 {
2592 struct ip_mc_list *im;
2593 struct ip_mc_list __rcu **mc_hash;
2594 struct ip_sf_list *psf;
2595 int rv = 0;
2596
2597 mc_hash = rcu_dereference(in_dev->mc_hash);
2598 if (mc_hash) {
2599 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2600
2601 for (im = rcu_dereference(mc_hash[hash]);
2602 im != NULL;
2603 im = rcu_dereference(im->next_hash)) {
2604 if (im->multiaddr == mc_addr)
2605 break;
2606 }
2607 } else {
2608 for_each_pmc_rcu(in_dev, im) {
2609 if (im->multiaddr == mc_addr)
2610 break;
2611 }
2612 }
2613 if (im && proto == IPPROTO_IGMP) {
2614 rv = 1;
2615 } else if (im) {
2616 if (src_addr) {
2617 for (psf = im->sources; psf; psf = psf->sf_next) {
2618 if (psf->sf_inaddr == src_addr)
2619 break;
2620 }
2621 if (psf)
2622 rv = psf->sf_count[MCAST_INCLUDE] ||
2623 psf->sf_count[MCAST_EXCLUDE] !=
2624 im->sfcount[MCAST_EXCLUDE];
2625 else
2626 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2627 } else
2628 rv = 1; /* unspecified source; tentatively allow */
2629 }
2630 return rv;
2631 }
2632
2633 #if defined(CONFIG_PROC_FS)
2634 struct igmp_mc_iter_state {
2635 struct seq_net_private p;
2636 struct net_device *dev;
2637 struct in_device *in_dev;
2638 };
2639
2640 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2641
2642 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2643 {
2644 struct net *net = seq_file_net(seq);
2645 struct ip_mc_list *im = NULL;
2646 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2647
2648 state->in_dev = NULL;
2649 for_each_netdev_rcu(net, state->dev) {
2650 struct in_device *in_dev;
2651
2652 in_dev = __in_dev_get_rcu(state->dev);
2653 if (!in_dev)
2654 continue;
2655 im = rcu_dereference(in_dev->mc_list);
2656 if (im) {
2657 state->in_dev = in_dev;
2658 break;
2659 }
2660 }
2661 return im;
2662 }
2663
2664 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2665 {
2666 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2667
2668 im = rcu_dereference(im->next_rcu);
2669 while (!im) {
2670 state->dev = next_net_device_rcu(state->dev);
2671 if (!state->dev) {
2672 state->in_dev = NULL;
2673 break;
2674 }
2675 state->in_dev = __in_dev_get_rcu(state->dev);
2676 if (!state->in_dev)
2677 continue;
2678 im = rcu_dereference(state->in_dev->mc_list);
2679 }
2680 return im;
2681 }
2682
2683 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2684 {
2685 struct ip_mc_list *im = igmp_mc_get_first(seq);
2686 if (im)
2687 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2688 --pos;
2689 return pos ? NULL : im;
2690 }
2691
2692 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2693 __acquires(rcu)
2694 {
2695 rcu_read_lock();
2696 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2697 }
2698
2699 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2700 {
2701 struct ip_mc_list *im;
2702 if (v == SEQ_START_TOKEN)
2703 im = igmp_mc_get_first(seq);
2704 else
2705 im = igmp_mc_get_next(seq, v);
2706 ++*pos;
2707 return im;
2708 }
2709
2710 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2711 __releases(rcu)
2712 {
2713 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2714
2715 state->in_dev = NULL;
2716 state->dev = NULL;
2717 rcu_read_unlock();
2718 }
2719
2720 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2721 {
2722 if (v == SEQ_START_TOKEN)
2723 seq_puts(seq,
2724 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2725 else {
2726 struct ip_mc_list *im = (struct ip_mc_list *)v;
2727 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2728 char *querier;
2729 long delta;
2730
2731 #ifdef CONFIG_IP_MULTICAST
2732 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2733 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2734 "V3";
2735 #else
2736 querier = "NONE";
2737 #endif
2738
2739 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2740 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2741 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2742 }
2743
2744 delta = im->timer.expires - jiffies;
2745 seq_printf(seq,
2746 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2747 im->multiaddr, im->users,
2748 im->tm_running,
2749 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2750 im->reporter);
2751 }
2752 return 0;
2753 }
2754
2755 static const struct seq_operations igmp_mc_seq_ops = {
2756 .start = igmp_mc_seq_start,
2757 .next = igmp_mc_seq_next,
2758 .stop = igmp_mc_seq_stop,
2759 .show = igmp_mc_seq_show,
2760 };
2761
2762 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2763 {
2764 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2765 sizeof(struct igmp_mc_iter_state));
2766 }
2767
2768 static const struct file_operations igmp_mc_seq_fops = {
2769 .owner = THIS_MODULE,
2770 .open = igmp_mc_seq_open,
2771 .read = seq_read,
2772 .llseek = seq_lseek,
2773 .release = seq_release_net,
2774 };
2775
2776 struct igmp_mcf_iter_state {
2777 struct seq_net_private p;
2778 struct net_device *dev;
2779 struct in_device *idev;
2780 struct ip_mc_list *im;
2781 };
2782
2783 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2784
2785 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2786 {
2787 struct net *net = seq_file_net(seq);
2788 struct ip_sf_list *psf = NULL;
2789 struct ip_mc_list *im = NULL;
2790 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2791
2792 state->idev = NULL;
2793 state->im = NULL;
2794 for_each_netdev_rcu(net, state->dev) {
2795 struct in_device *idev;
2796 idev = __in_dev_get_rcu(state->dev);
2797 if (unlikely(!idev))
2798 continue;
2799 im = rcu_dereference(idev->mc_list);
2800 if (likely(im)) {
2801 spin_lock_bh(&im->lock);
2802 psf = im->sources;
2803 if (likely(psf)) {
2804 state->im = im;
2805 state->idev = idev;
2806 break;
2807 }
2808 spin_unlock_bh(&im->lock);
2809 }
2810 }
2811 return psf;
2812 }
2813
2814 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2815 {
2816 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2817
2818 psf = psf->sf_next;
2819 while (!psf) {
2820 spin_unlock_bh(&state->im->lock);
2821 state->im = state->im->next;
2822 while (!state->im) {
2823 state->dev = next_net_device_rcu(state->dev);
2824 if (!state->dev) {
2825 state->idev = NULL;
2826 goto out;
2827 }
2828 state->idev = __in_dev_get_rcu(state->dev);
2829 if (!state->idev)
2830 continue;
2831 state->im = rcu_dereference(state->idev->mc_list);
2832 }
2833 if (!state->im)
2834 break;
2835 spin_lock_bh(&state->im->lock);
2836 psf = state->im->sources;
2837 }
2838 out:
2839 return psf;
2840 }
2841
2842 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2843 {
2844 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2845 if (psf)
2846 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2847 --pos;
2848 return pos ? NULL : psf;
2849 }
2850
2851 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2852 __acquires(rcu)
2853 {
2854 rcu_read_lock();
2855 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2856 }
2857
2858 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2859 {
2860 struct ip_sf_list *psf;
2861 if (v == SEQ_START_TOKEN)
2862 psf = igmp_mcf_get_first(seq);
2863 else
2864 psf = igmp_mcf_get_next(seq, v);
2865 ++*pos;
2866 return psf;
2867 }
2868
2869 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2870 __releases(rcu)
2871 {
2872 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2873 if (likely(state->im)) {
2874 spin_unlock_bh(&state->im->lock);
2875 state->im = NULL;
2876 }
2877 state->idev = NULL;
2878 state->dev = NULL;
2879 rcu_read_unlock();
2880 }
2881
2882 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2883 {
2884 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2885 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2886
2887 if (v == SEQ_START_TOKEN) {
2888 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2889 } else {
2890 seq_printf(seq,
2891 "%3d %6.6s 0x%08x "
2892 "0x%08x %6lu %6lu\n",
2893 state->dev->ifindex, state->dev->name,
2894 ntohl(state->im->multiaddr),
2895 ntohl(psf->sf_inaddr),
2896 psf->sf_count[MCAST_INCLUDE],
2897 psf->sf_count[MCAST_EXCLUDE]);
2898 }
2899 return 0;
2900 }
2901
2902 static const struct seq_operations igmp_mcf_seq_ops = {
2903 .start = igmp_mcf_seq_start,
2904 .next = igmp_mcf_seq_next,
2905 .stop = igmp_mcf_seq_stop,
2906 .show = igmp_mcf_seq_show,
2907 };
2908
2909 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2910 {
2911 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2912 sizeof(struct igmp_mcf_iter_state));
2913 }
2914
2915 static const struct file_operations igmp_mcf_seq_fops = {
2916 .owner = THIS_MODULE,
2917 .open = igmp_mcf_seq_open,
2918 .read = seq_read,
2919 .llseek = seq_lseek,
2920 .release = seq_release_net,
2921 };
2922
2923 static int __net_init igmp_net_init(struct net *net)
2924 {
2925 struct proc_dir_entry *pde;
2926 int err;
2927
2928 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2929 if (!pde)
2930 goto out_igmp;
2931 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2932 &igmp_mcf_seq_fops);
2933 if (!pde)
2934 goto out_mcfilter;
2935 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2936 SOCK_DGRAM, 0, net);
2937 if (err < 0) {
2938 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2939 err);
2940 goto out_sock;
2941 }
2942
2943 /* Sysctl initialization */
2944 net->ipv4.sysctl_igmp_max_memberships = 20;
2945 net->ipv4.sysctl_igmp_max_msf = 10;
2946 /* IGMP reports for link-local multicast groups are enabled by default */
2947 net->ipv4.sysctl_igmp_llm_reports = 1;
2948 net->ipv4.sysctl_igmp_qrv = 2;
2949 return 0;
2950
2951 out_sock:
2952 remove_proc_entry("mcfilter", net->proc_net);
2953 out_mcfilter:
2954 remove_proc_entry("igmp", net->proc_net);
2955 out_igmp:
2956 return -ENOMEM;
2957 }
2958
2959 static void __net_exit igmp_net_exit(struct net *net)
2960 {
2961 remove_proc_entry("mcfilter", net->proc_net);
2962 remove_proc_entry("igmp", net->proc_net);
2963 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2964 }
2965
2966 static struct pernet_operations igmp_net_ops = {
2967 .init = igmp_net_init,
2968 .exit = igmp_net_exit,
2969 };
2970 #endif
2971
2972 static int igmp_netdev_event(struct notifier_block *this,
2973 unsigned long event, void *ptr)
2974 {
2975 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2976 struct in_device *in_dev;
2977
2978 switch (event) {
2979 case NETDEV_RESEND_IGMP:
2980 in_dev = __in_dev_get_rtnl(dev);
2981 if (in_dev)
2982 ip_mc_rejoin_groups(in_dev);
2983 break;
2984 default:
2985 break;
2986 }
2987 return NOTIFY_DONE;
2988 }
2989
2990 static struct notifier_block igmp_notifier = {
2991 .notifier_call = igmp_netdev_event,
2992 };
2993
2994 int __init igmp_mc_init(void)
2995 {
2996 #if defined(CONFIG_PROC_FS)
2997 int err;
2998
2999 err = register_pernet_subsys(&igmp_net_ops);
3000 if (err)
3001 return err;
3002 err = register_netdevice_notifier(&igmp_notifier);
3003 if (err)
3004 goto reg_notif_fail;
3005 return 0;
3006
3007 reg_notif_fail:
3008 unregister_pernet_subsys(&igmp_net_ops);
3009 return err;
3010 #else
3011 return register_netdevice_notifier(&igmp_notifier);
3012 #endif
3013 }
Linux kernel - Deliverables
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