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tcp: add tcp_in_slow_start helper
[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 #define IP_MAX_MEMBERSHIPS 20
111 #define IP_MAX_MSF 10
112
113 #ifdef CONFIG_IP_MULTICAST
114 /* Parameter names and values are taken from igmp-v2-06 draft */
115
116 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
117 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
118 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
119 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
120 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
121 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
122
123
124 #define IGMP_INITIAL_REPORT_DELAY (1)
125
126 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
127 * IGMP specs require to report membership immediately after
128 * joining a group, but we delay the first report by a
129 * small interval. It seems more natural and still does not
130 * contradict to specs provided this delay is small enough.
131 */
132
133 #define IGMP_V1_SEEN(in_dev) \
134 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
135 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
136 ((in_dev)->mr_v1_seen && \
137 time_before(jiffies, (in_dev)->mr_v1_seen)))
138 #define IGMP_V2_SEEN(in_dev) \
139 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
140 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
141 ((in_dev)->mr_v2_seen && \
142 time_before(jiffies, (in_dev)->mr_v2_seen)))
143
144 static int unsolicited_report_interval(struct in_device *in_dev)
145 {
146 int interval_ms, interval_jiffies;
147
148 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
149 interval_ms = IN_DEV_CONF_GET(
150 in_dev,
151 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
152 else /* v3 */
153 interval_ms = IN_DEV_CONF_GET(
154 in_dev,
155 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
156
157 interval_jiffies = msecs_to_jiffies(interval_ms);
158
159 /* _timer functions can't handle a delay of 0 jiffies so ensure
160 * we always return a positive value.
161 */
162 if (interval_jiffies <= 0)
163 interval_jiffies = 1;
164 return interval_jiffies;
165 }
166
167 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
168 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
169 static void igmpv3_clear_delrec(struct in_device *in_dev);
170 static int sf_setstate(struct ip_mc_list *pmc);
171 static void sf_markstate(struct ip_mc_list *pmc);
172 #endif
173 static void ip_mc_clear_src(struct ip_mc_list *pmc);
174 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
175 int sfcount, __be32 *psfsrc, int delta);
176
177 static void ip_ma_put(struct ip_mc_list *im)
178 {
179 if (atomic_dec_and_test(&im->refcnt)) {
180 in_dev_put(im->interface);
181 kfree_rcu(im, rcu);
182 }
183 }
184
185 #define for_each_pmc_rcu(in_dev, pmc) \
186 for (pmc = rcu_dereference(in_dev->mc_list); \
187 pmc != NULL; \
188 pmc = rcu_dereference(pmc->next_rcu))
189
190 #define for_each_pmc_rtnl(in_dev, pmc) \
191 for (pmc = rtnl_dereference(in_dev->mc_list); \
192 pmc != NULL; \
193 pmc = rtnl_dereference(pmc->next_rcu))
194
195 #ifdef CONFIG_IP_MULTICAST
196
197 /*
198 * Timer management
199 */
200
201 static void igmp_stop_timer(struct ip_mc_list *im)
202 {
203 spin_lock_bh(&im->lock);
204 if (del_timer(&im->timer))
205 atomic_dec(&im->refcnt);
206 im->tm_running = 0;
207 im->reporter = 0;
208 im->unsolicit_count = 0;
209 spin_unlock_bh(&im->lock);
210 }
211
212 /* It must be called with locked im->lock */
213 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
214 {
215 int tv = prandom_u32() % max_delay;
216
217 im->tm_running = 1;
218 if (!mod_timer(&im->timer, jiffies+tv+2))
219 atomic_inc(&im->refcnt);
220 }
221
222 static void igmp_gq_start_timer(struct in_device *in_dev)
223 {
224 int tv = prandom_u32() % in_dev->mr_maxdelay;
225
226 in_dev->mr_gq_running = 1;
227 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
228 in_dev_hold(in_dev);
229 }
230
231 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
232 {
233 int tv = prandom_u32() % delay;
234
235 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
236 in_dev_hold(in_dev);
237 }
238
239 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
240 {
241 spin_lock_bh(&im->lock);
242 im->unsolicit_count = 0;
243 if (del_timer(&im->timer)) {
244 if ((long)(im->timer.expires-jiffies) < max_delay) {
245 add_timer(&im->timer);
246 im->tm_running = 1;
247 spin_unlock_bh(&im->lock);
248 return;
249 }
250 atomic_dec(&im->refcnt);
251 }
252 igmp_start_timer(im, max_delay);
253 spin_unlock_bh(&im->lock);
254 }
255
256
257 /*
258 * Send an IGMP report.
259 */
260
261 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
262
263
264 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
265 int gdeleted, int sdeleted)
266 {
267 switch (type) {
268 case IGMPV3_MODE_IS_INCLUDE:
269 case IGMPV3_MODE_IS_EXCLUDE:
270 if (gdeleted || sdeleted)
271 return 0;
272 if (!(pmc->gsquery && !psf->sf_gsresp)) {
273 if (pmc->sfmode == MCAST_INCLUDE)
274 return 1;
275 /* don't include if this source is excluded
276 * in all filters
277 */
278 if (psf->sf_count[MCAST_INCLUDE])
279 return type == IGMPV3_MODE_IS_INCLUDE;
280 return pmc->sfcount[MCAST_EXCLUDE] ==
281 psf->sf_count[MCAST_EXCLUDE];
282 }
283 return 0;
284 case IGMPV3_CHANGE_TO_INCLUDE:
285 if (gdeleted || sdeleted)
286 return 0;
287 return psf->sf_count[MCAST_INCLUDE] != 0;
288 case IGMPV3_CHANGE_TO_EXCLUDE:
289 if (gdeleted || sdeleted)
290 return 0;
291 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
292 psf->sf_count[MCAST_INCLUDE])
293 return 0;
294 return pmc->sfcount[MCAST_EXCLUDE] ==
295 psf->sf_count[MCAST_EXCLUDE];
296 case IGMPV3_ALLOW_NEW_SOURCES:
297 if (gdeleted || !psf->sf_crcount)
298 return 0;
299 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
300 case IGMPV3_BLOCK_OLD_SOURCES:
301 if (pmc->sfmode == MCAST_INCLUDE)
302 return gdeleted || (psf->sf_crcount && sdeleted);
303 return psf->sf_crcount && !gdeleted && !sdeleted;
304 }
305 return 0;
306 }
307
308 static int
309 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
310 {
311 struct ip_sf_list *psf;
312 int scount = 0;
313
314 for (psf = pmc->sources; psf; psf = psf->sf_next) {
315 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
316 continue;
317 scount++;
318 }
319 return scount;
320 }
321
322 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
323 {
324 struct sk_buff *skb;
325 struct rtable *rt;
326 struct iphdr *pip;
327 struct igmpv3_report *pig;
328 struct net *net = dev_net(dev);
329 struct flowi4 fl4;
330 int hlen = LL_RESERVED_SPACE(dev);
331 int tlen = dev->needed_tailroom;
332 unsigned int size = mtu;
333
334 while (1) {
335 skb = alloc_skb(size + hlen + tlen,
336 GFP_ATOMIC | __GFP_NOWARN);
337 if (skb)
338 break;
339 size >>= 1;
340 if (size < 256)
341 return NULL;
342 }
343 skb->priority = TC_PRIO_CONTROL;
344
345 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
346 0, 0,
347 IPPROTO_IGMP, 0, dev->ifindex);
348 if (IS_ERR(rt)) {
349 kfree_skb(skb);
350 return NULL;
351 }
352
353 skb_dst_set(skb, &rt->dst);
354 skb->dev = dev;
355
356 skb->reserved_tailroom = skb_end_offset(skb) -
357 min(mtu, skb_end_offset(skb));
358 skb_reserve(skb, hlen);
359
360 skb_reset_network_header(skb);
361 pip = ip_hdr(skb);
362 skb_put(skb, sizeof(struct iphdr) + 4);
363
364 pip->version = 4;
365 pip->ihl = (sizeof(struct iphdr)+4)>>2;
366 pip->tos = 0xc0;
367 pip->frag_off = htons(IP_DF);
368 pip->ttl = 1;
369 pip->daddr = fl4.daddr;
370 pip->saddr = fl4.saddr;
371 pip->protocol = IPPROTO_IGMP;
372 pip->tot_len = 0; /* filled in later */
373 ip_select_ident(net, skb, NULL);
374 ((u8 *)&pip[1])[0] = IPOPT_RA;
375 ((u8 *)&pip[1])[1] = 4;
376 ((u8 *)&pip[1])[2] = 0;
377 ((u8 *)&pip[1])[3] = 0;
378
379 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
380 skb_put(skb, sizeof(*pig));
381 pig = igmpv3_report_hdr(skb);
382 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
383 pig->resv1 = 0;
384 pig->csum = 0;
385 pig->resv2 = 0;
386 pig->ngrec = 0;
387 return skb;
388 }
389
390 static int igmpv3_sendpack(struct sk_buff *skb)
391 {
392 struct igmphdr *pig = igmp_hdr(skb);
393 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
394
395 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
396
397 return ip_local_out(skb);
398 }
399
400 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
401 {
402 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
403 }
404
405 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
406 int type, struct igmpv3_grec **ppgr)
407 {
408 struct net_device *dev = pmc->interface->dev;
409 struct igmpv3_report *pih;
410 struct igmpv3_grec *pgr;
411
412 if (!skb)
413 skb = igmpv3_newpack(dev, dev->mtu);
414 if (!skb)
415 return NULL;
416 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
417 pgr->grec_type = type;
418 pgr->grec_auxwords = 0;
419 pgr->grec_nsrcs = 0;
420 pgr->grec_mca = pmc->multiaddr;
421 pih = igmpv3_report_hdr(skb);
422 pih->ngrec = htons(ntohs(pih->ngrec)+1);
423 *ppgr = pgr;
424 return skb;
425 }
426
427 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
428
429 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
430 int type, int gdeleted, int sdeleted)
431 {
432 struct net_device *dev = pmc->interface->dev;
433 struct igmpv3_report *pih;
434 struct igmpv3_grec *pgr = NULL;
435 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
436 int scount, stotal, first, isquery, truncate;
437
438 if (pmc->multiaddr == IGMP_ALL_HOSTS)
439 return skb;
440
441 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
442 type == IGMPV3_MODE_IS_EXCLUDE;
443 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
444 type == IGMPV3_CHANGE_TO_EXCLUDE;
445
446 stotal = scount = 0;
447
448 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
449
450 if (!*psf_list)
451 goto empty_source;
452
453 pih = skb ? igmpv3_report_hdr(skb) : NULL;
454
455 /* EX and TO_EX get a fresh packet, if needed */
456 if (truncate) {
457 if (pih && pih->ngrec &&
458 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
459 if (skb)
460 igmpv3_sendpack(skb);
461 skb = igmpv3_newpack(dev, dev->mtu);
462 }
463 }
464 first = 1;
465 psf_prev = NULL;
466 for (psf = *psf_list; psf; psf = psf_next) {
467 __be32 *psrc;
468
469 psf_next = psf->sf_next;
470
471 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
472 psf_prev = psf;
473 continue;
474 }
475
476 /* clear marks on query responses */
477 if (isquery)
478 psf->sf_gsresp = 0;
479
480 if (AVAILABLE(skb) < sizeof(__be32) +
481 first*sizeof(struct igmpv3_grec)) {
482 if (truncate && !first)
483 break; /* truncate these */
484 if (pgr)
485 pgr->grec_nsrcs = htons(scount);
486 if (skb)
487 igmpv3_sendpack(skb);
488 skb = igmpv3_newpack(dev, dev->mtu);
489 first = 1;
490 scount = 0;
491 }
492 if (first) {
493 skb = add_grhead(skb, pmc, type, &pgr);
494 first = 0;
495 }
496 if (!skb)
497 return NULL;
498 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
499 *psrc = psf->sf_inaddr;
500 scount++; stotal++;
501 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
502 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
503 psf->sf_crcount--;
504 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
505 if (psf_prev)
506 psf_prev->sf_next = psf->sf_next;
507 else
508 *psf_list = psf->sf_next;
509 kfree(psf);
510 continue;
511 }
512 }
513 psf_prev = psf;
514 }
515
516 empty_source:
517 if (!stotal) {
518 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
519 type == IGMPV3_BLOCK_OLD_SOURCES)
520 return skb;
521 if (pmc->crcount || isquery) {
522 /* make sure we have room for group header */
523 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
524 igmpv3_sendpack(skb);
525 skb = NULL; /* add_grhead will get a new one */
526 }
527 skb = add_grhead(skb, pmc, type, &pgr);
528 }
529 }
530 if (pgr)
531 pgr->grec_nsrcs = htons(scount);
532
533 if (isquery)
534 pmc->gsquery = 0; /* clear query state on report */
535 return skb;
536 }
537
538 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
539 {
540 struct sk_buff *skb = NULL;
541 int type;
542
543 if (!pmc) {
544 rcu_read_lock();
545 for_each_pmc_rcu(in_dev, pmc) {
546 if (pmc->multiaddr == IGMP_ALL_HOSTS)
547 continue;
548 spin_lock_bh(&pmc->lock);
549 if (pmc->sfcount[MCAST_EXCLUDE])
550 type = IGMPV3_MODE_IS_EXCLUDE;
551 else
552 type = IGMPV3_MODE_IS_INCLUDE;
553 skb = add_grec(skb, pmc, type, 0, 0);
554 spin_unlock_bh(&pmc->lock);
555 }
556 rcu_read_unlock();
557 } else {
558 spin_lock_bh(&pmc->lock);
559 if (pmc->sfcount[MCAST_EXCLUDE])
560 type = IGMPV3_MODE_IS_EXCLUDE;
561 else
562 type = IGMPV3_MODE_IS_INCLUDE;
563 skb = add_grec(skb, pmc, type, 0, 0);
564 spin_unlock_bh(&pmc->lock);
565 }
566 if (!skb)
567 return 0;
568 return igmpv3_sendpack(skb);
569 }
570
571 /*
572 * remove zero-count source records from a source filter list
573 */
574 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
575 {
576 struct ip_sf_list *psf_prev, *psf_next, *psf;
577
578 psf_prev = NULL;
579 for (psf = *ppsf; psf; psf = psf_next) {
580 psf_next = psf->sf_next;
581 if (psf->sf_crcount == 0) {
582 if (psf_prev)
583 psf_prev->sf_next = psf->sf_next;
584 else
585 *ppsf = psf->sf_next;
586 kfree(psf);
587 } else
588 psf_prev = psf;
589 }
590 }
591
592 static void igmpv3_send_cr(struct in_device *in_dev)
593 {
594 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
595 struct sk_buff *skb = NULL;
596 int type, dtype;
597
598 rcu_read_lock();
599 spin_lock_bh(&in_dev->mc_tomb_lock);
600
601 /* deleted MCA's */
602 pmc_prev = NULL;
603 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
604 pmc_next = pmc->next;
605 if (pmc->sfmode == MCAST_INCLUDE) {
606 type = IGMPV3_BLOCK_OLD_SOURCES;
607 dtype = IGMPV3_BLOCK_OLD_SOURCES;
608 skb = add_grec(skb, pmc, type, 1, 0);
609 skb = add_grec(skb, pmc, dtype, 1, 1);
610 }
611 if (pmc->crcount) {
612 if (pmc->sfmode == MCAST_EXCLUDE) {
613 type = IGMPV3_CHANGE_TO_INCLUDE;
614 skb = add_grec(skb, pmc, type, 1, 0);
615 }
616 pmc->crcount--;
617 if (pmc->crcount == 0) {
618 igmpv3_clear_zeros(&pmc->tomb);
619 igmpv3_clear_zeros(&pmc->sources);
620 }
621 }
622 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
623 if (pmc_prev)
624 pmc_prev->next = pmc_next;
625 else
626 in_dev->mc_tomb = pmc_next;
627 in_dev_put(pmc->interface);
628 kfree(pmc);
629 } else
630 pmc_prev = pmc;
631 }
632 spin_unlock_bh(&in_dev->mc_tomb_lock);
633
634 /* change recs */
635 for_each_pmc_rcu(in_dev, pmc) {
636 spin_lock_bh(&pmc->lock);
637 if (pmc->sfcount[MCAST_EXCLUDE]) {
638 type = IGMPV3_BLOCK_OLD_SOURCES;
639 dtype = IGMPV3_ALLOW_NEW_SOURCES;
640 } else {
641 type = IGMPV3_ALLOW_NEW_SOURCES;
642 dtype = IGMPV3_BLOCK_OLD_SOURCES;
643 }
644 skb = add_grec(skb, pmc, type, 0, 0);
645 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
646
647 /* filter mode changes */
648 if (pmc->crcount) {
649 if (pmc->sfmode == MCAST_EXCLUDE)
650 type = IGMPV3_CHANGE_TO_EXCLUDE;
651 else
652 type = IGMPV3_CHANGE_TO_INCLUDE;
653 skb = add_grec(skb, pmc, type, 0, 0);
654 pmc->crcount--;
655 }
656 spin_unlock_bh(&pmc->lock);
657 }
658 rcu_read_unlock();
659
660 if (!skb)
661 return;
662 (void) igmpv3_sendpack(skb);
663 }
664
665 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
666 int type)
667 {
668 struct sk_buff *skb;
669 struct iphdr *iph;
670 struct igmphdr *ih;
671 struct rtable *rt;
672 struct net_device *dev = in_dev->dev;
673 struct net *net = dev_net(dev);
674 __be32 group = pmc ? pmc->multiaddr : 0;
675 struct flowi4 fl4;
676 __be32 dst;
677 int hlen, tlen;
678
679 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
680 return igmpv3_send_report(in_dev, pmc);
681 else if (type == IGMP_HOST_LEAVE_MESSAGE)
682 dst = IGMP_ALL_ROUTER;
683 else
684 dst = group;
685
686 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
687 0, 0,
688 IPPROTO_IGMP, 0, dev->ifindex);
689 if (IS_ERR(rt))
690 return -1;
691
692 hlen = LL_RESERVED_SPACE(dev);
693 tlen = dev->needed_tailroom;
694 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
695 if (!skb) {
696 ip_rt_put(rt);
697 return -1;
698 }
699 skb->priority = TC_PRIO_CONTROL;
700
701 skb_dst_set(skb, &rt->dst);
702
703 skb_reserve(skb, hlen);
704
705 skb_reset_network_header(skb);
706 iph = ip_hdr(skb);
707 skb_put(skb, sizeof(struct iphdr) + 4);
708
709 iph->version = 4;
710 iph->ihl = (sizeof(struct iphdr)+4)>>2;
711 iph->tos = 0xc0;
712 iph->frag_off = htons(IP_DF);
713 iph->ttl = 1;
714 iph->daddr = dst;
715 iph->saddr = fl4.saddr;
716 iph->protocol = IPPROTO_IGMP;
717 ip_select_ident(net, skb, NULL);
718 ((u8 *)&iph[1])[0] = IPOPT_RA;
719 ((u8 *)&iph[1])[1] = 4;
720 ((u8 *)&iph[1])[2] = 0;
721 ((u8 *)&iph[1])[3] = 0;
722
723 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
724 ih->type = type;
725 ih->code = 0;
726 ih->csum = 0;
727 ih->group = group;
728 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
729
730 return ip_local_out(skb);
731 }
732
733 static void igmp_gq_timer_expire(unsigned long data)
734 {
735 struct in_device *in_dev = (struct in_device *)data;
736
737 in_dev->mr_gq_running = 0;
738 igmpv3_send_report(in_dev, NULL);
739 in_dev_put(in_dev);
740 }
741
742 static void igmp_ifc_timer_expire(unsigned long data)
743 {
744 struct in_device *in_dev = (struct in_device *)data;
745
746 igmpv3_send_cr(in_dev);
747 if (in_dev->mr_ifc_count) {
748 in_dev->mr_ifc_count--;
749 igmp_ifc_start_timer(in_dev,
750 unsolicited_report_interval(in_dev));
751 }
752 in_dev_put(in_dev);
753 }
754
755 static void igmp_ifc_event(struct in_device *in_dev)
756 {
757 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
758 return;
759 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv;
760 igmp_ifc_start_timer(in_dev, 1);
761 }
762
763
764 static void igmp_timer_expire(unsigned long data)
765 {
766 struct ip_mc_list *im = (struct ip_mc_list *)data;
767 struct in_device *in_dev = im->interface;
768
769 spin_lock(&im->lock);
770 im->tm_running = 0;
771
772 if (im->unsolicit_count) {
773 im->unsolicit_count--;
774 igmp_start_timer(im, unsolicited_report_interval(in_dev));
775 }
776 im->reporter = 1;
777 spin_unlock(&im->lock);
778
779 if (IGMP_V1_SEEN(in_dev))
780 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
781 else if (IGMP_V2_SEEN(in_dev))
782 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
783 else
784 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
785
786 ip_ma_put(im);
787 }
788
789 /* mark EXCLUDE-mode sources */
790 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
791 {
792 struct ip_sf_list *psf;
793 int i, scount;
794
795 scount = 0;
796 for (psf = pmc->sources; psf; psf = psf->sf_next) {
797 if (scount == nsrcs)
798 break;
799 for (i = 0; i < nsrcs; i++) {
800 /* skip inactive filters */
801 if (psf->sf_count[MCAST_INCLUDE] ||
802 pmc->sfcount[MCAST_EXCLUDE] !=
803 psf->sf_count[MCAST_EXCLUDE])
804 break;
805 if (srcs[i] == psf->sf_inaddr) {
806 scount++;
807 break;
808 }
809 }
810 }
811 pmc->gsquery = 0;
812 if (scount == nsrcs) /* all sources excluded */
813 return 0;
814 return 1;
815 }
816
817 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
818 {
819 struct ip_sf_list *psf;
820 int i, scount;
821
822 if (pmc->sfmode == MCAST_EXCLUDE)
823 return igmp_xmarksources(pmc, nsrcs, srcs);
824
825 /* mark INCLUDE-mode sources */
826 scount = 0;
827 for (psf = pmc->sources; psf; psf = psf->sf_next) {
828 if (scount == nsrcs)
829 break;
830 for (i = 0; i < nsrcs; i++)
831 if (srcs[i] == psf->sf_inaddr) {
832 psf->sf_gsresp = 1;
833 scount++;
834 break;
835 }
836 }
837 if (!scount) {
838 pmc->gsquery = 0;
839 return 0;
840 }
841 pmc->gsquery = 1;
842 return 1;
843 }
844
845 /* return true if packet was dropped */
846 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
847 {
848 struct ip_mc_list *im;
849
850 /* Timers are only set for non-local groups */
851
852 if (group == IGMP_ALL_HOSTS)
853 return false;
854
855 rcu_read_lock();
856 for_each_pmc_rcu(in_dev, im) {
857 if (im->multiaddr == group) {
858 igmp_stop_timer(im);
859 break;
860 }
861 }
862 rcu_read_unlock();
863 return false;
864 }
865
866 /* return true if packet was dropped */
867 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
868 int len)
869 {
870 struct igmphdr *ih = igmp_hdr(skb);
871 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
872 struct ip_mc_list *im;
873 __be32 group = ih->group;
874 int max_delay;
875 int mark = 0;
876
877
878 if (len == 8) {
879 if (ih->code == 0) {
880 /* Alas, old v1 router presents here. */
881
882 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
883 in_dev->mr_v1_seen = jiffies +
884 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
885 group = 0;
886 } else {
887 /* v2 router present */
888 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
889 in_dev->mr_v2_seen = jiffies +
890 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
891 }
892 /* cancel the interface change timer */
893 in_dev->mr_ifc_count = 0;
894 if (del_timer(&in_dev->mr_ifc_timer))
895 __in_dev_put(in_dev);
896 /* clear deleted report items */
897 igmpv3_clear_delrec(in_dev);
898 } else if (len < 12) {
899 return true; /* ignore bogus packet; freed by caller */
900 } else if (IGMP_V1_SEEN(in_dev)) {
901 /* This is a v3 query with v1 queriers present */
902 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
903 group = 0;
904 } else if (IGMP_V2_SEEN(in_dev)) {
905 /* this is a v3 query with v2 queriers present;
906 * Interpretation of the max_delay code is problematic here.
907 * A real v2 host would use ih_code directly, while v3 has a
908 * different encoding. We use the v3 encoding as more likely
909 * to be intended in a v3 query.
910 */
911 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
912 if (!max_delay)
913 max_delay = 1; /* can't mod w/ 0 */
914 } else { /* v3 */
915 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
916 return true;
917
918 ih3 = igmpv3_query_hdr(skb);
919 if (ih3->nsrcs) {
920 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
921 + ntohs(ih3->nsrcs)*sizeof(__be32)))
922 return true;
923 ih3 = igmpv3_query_hdr(skb);
924 }
925
926 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
927 if (!max_delay)
928 max_delay = 1; /* can't mod w/ 0 */
929 in_dev->mr_maxdelay = max_delay;
930 if (ih3->qrv)
931 in_dev->mr_qrv = ih3->qrv;
932 if (!group) { /* general query */
933 if (ih3->nsrcs)
934 return true; /* no sources allowed */
935 igmp_gq_start_timer(in_dev);
936 return false;
937 }
938 /* mark sources to include, if group & source-specific */
939 mark = ih3->nsrcs != 0;
940 }
941
942 /*
943 * - Start the timers in all of our membership records
944 * that the query applies to for the interface on
945 * which the query arrived excl. those that belong
946 * to a "local" group (224.0.0.X)
947 * - For timers already running check if they need to
948 * be reset.
949 * - Use the igmp->igmp_code field as the maximum
950 * delay possible
951 */
952 rcu_read_lock();
953 for_each_pmc_rcu(in_dev, im) {
954 int changed;
955
956 if (group && group != im->multiaddr)
957 continue;
958 if (im->multiaddr == IGMP_ALL_HOSTS)
959 continue;
960 spin_lock_bh(&im->lock);
961 if (im->tm_running)
962 im->gsquery = im->gsquery && mark;
963 else
964 im->gsquery = mark;
965 changed = !im->gsquery ||
966 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
967 spin_unlock_bh(&im->lock);
968 if (changed)
969 igmp_mod_timer(im, max_delay);
970 }
971 rcu_read_unlock();
972 return false;
973 }
974
975 /* called in rcu_read_lock() section */
976 int igmp_rcv(struct sk_buff *skb)
977 {
978 /* This basically follows the spec line by line -- see RFC1112 */
979 struct igmphdr *ih;
980 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
981 int len = skb->len;
982 bool dropped = true;
983
984 if (!in_dev)
985 goto drop;
986
987 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
988 goto drop;
989
990 if (skb_checksum_simple_validate(skb))
991 goto drop;
992
993 ih = igmp_hdr(skb);
994 switch (ih->type) {
995 case IGMP_HOST_MEMBERSHIP_QUERY:
996 dropped = igmp_heard_query(in_dev, skb, len);
997 break;
998 case IGMP_HOST_MEMBERSHIP_REPORT:
999 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1000 /* Is it our report looped back? */
1001 if (rt_is_output_route(skb_rtable(skb)))
1002 break;
1003 /* don't rely on MC router hearing unicast reports */
1004 if (skb->pkt_type == PACKET_MULTICAST ||
1005 skb->pkt_type == PACKET_BROADCAST)
1006 dropped = igmp_heard_report(in_dev, ih->group);
1007 break;
1008 case IGMP_PIM:
1009 #ifdef CONFIG_IP_PIMSM_V1
1010 return pim_rcv_v1(skb);
1011 #endif
1012 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1013 case IGMP_DVMRP:
1014 case IGMP_TRACE:
1015 case IGMP_HOST_LEAVE_MESSAGE:
1016 case IGMP_MTRACE:
1017 case IGMP_MTRACE_RESP:
1018 break;
1019 default:
1020 break;
1021 }
1022
1023 drop:
1024 if (dropped)
1025 kfree_skb(skb);
1026 else
1027 consume_skb(skb);
1028 return 0;
1029 }
1030
1031 #endif
1032
1033
1034 /*
1035 * Add a filter to a device
1036 */
1037
1038 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1039 {
1040 char buf[MAX_ADDR_LEN];
1041 struct net_device *dev = in_dev->dev;
1042
1043 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1044 We will get multicast token leakage, when IFF_MULTICAST
1045 is changed. This check should be done in ndo_set_rx_mode
1046 routine. Something sort of:
1047 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1048 --ANK
1049 */
1050 if (arp_mc_map(addr, buf, dev, 0) == 0)
1051 dev_mc_add(dev, buf);
1052 }
1053
1054 /*
1055 * Remove a filter from a device
1056 */
1057
1058 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1059 {
1060 char buf[MAX_ADDR_LEN];
1061 struct net_device *dev = in_dev->dev;
1062
1063 if (arp_mc_map(addr, buf, dev, 0) == 0)
1064 dev_mc_del(dev, buf);
1065 }
1066
1067 #ifdef CONFIG_IP_MULTICAST
1068 /*
1069 * deleted ip_mc_list manipulation
1070 */
1071 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1072 {
1073 struct ip_mc_list *pmc;
1074
1075 /* this is an "ip_mc_list" for convenience; only the fields below
1076 * are actually used. In particular, the refcnt and users are not
1077 * used for management of the delete list. Using the same structure
1078 * for deleted items allows change reports to use common code with
1079 * non-deleted or query-response MCA's.
1080 */
1081 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1082 if (!pmc)
1083 return;
1084 spin_lock_bh(&im->lock);
1085 pmc->interface = im->interface;
1086 in_dev_hold(in_dev);
1087 pmc->multiaddr = im->multiaddr;
1088 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1089 pmc->sfmode = im->sfmode;
1090 if (pmc->sfmode == MCAST_INCLUDE) {
1091 struct ip_sf_list *psf;
1092
1093 pmc->tomb = im->tomb;
1094 pmc->sources = im->sources;
1095 im->tomb = im->sources = NULL;
1096 for (psf = pmc->sources; psf; psf = psf->sf_next)
1097 psf->sf_crcount = pmc->crcount;
1098 }
1099 spin_unlock_bh(&im->lock);
1100
1101 spin_lock_bh(&in_dev->mc_tomb_lock);
1102 pmc->next = in_dev->mc_tomb;
1103 in_dev->mc_tomb = pmc;
1104 spin_unlock_bh(&in_dev->mc_tomb_lock);
1105 }
1106
1107 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1108 {
1109 struct ip_mc_list *pmc, *pmc_prev;
1110 struct ip_sf_list *psf, *psf_next;
1111
1112 spin_lock_bh(&in_dev->mc_tomb_lock);
1113 pmc_prev = NULL;
1114 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1115 if (pmc->multiaddr == multiaddr)
1116 break;
1117 pmc_prev = pmc;
1118 }
1119 if (pmc) {
1120 if (pmc_prev)
1121 pmc_prev->next = pmc->next;
1122 else
1123 in_dev->mc_tomb = pmc->next;
1124 }
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1126 if (pmc) {
1127 for (psf = pmc->tomb; psf; psf = psf_next) {
1128 psf_next = psf->sf_next;
1129 kfree(psf);
1130 }
1131 in_dev_put(pmc->interface);
1132 kfree(pmc);
1133 }
1134 }
1135
1136 static void igmpv3_clear_delrec(struct in_device *in_dev)
1137 {
1138 struct ip_mc_list *pmc, *nextpmc;
1139
1140 spin_lock_bh(&in_dev->mc_tomb_lock);
1141 pmc = in_dev->mc_tomb;
1142 in_dev->mc_tomb = NULL;
1143 spin_unlock_bh(&in_dev->mc_tomb_lock);
1144
1145 for (; pmc; pmc = nextpmc) {
1146 nextpmc = pmc->next;
1147 ip_mc_clear_src(pmc);
1148 in_dev_put(pmc->interface);
1149 kfree(pmc);
1150 }
1151 /* clear dead sources, too */
1152 rcu_read_lock();
1153 for_each_pmc_rcu(in_dev, pmc) {
1154 struct ip_sf_list *psf, *psf_next;
1155
1156 spin_lock_bh(&pmc->lock);
1157 psf = pmc->tomb;
1158 pmc->tomb = NULL;
1159 spin_unlock_bh(&pmc->lock);
1160 for (; psf; psf = psf_next) {
1161 psf_next = psf->sf_next;
1162 kfree(psf);
1163 }
1164 }
1165 rcu_read_unlock();
1166 }
1167 #endif
1168
1169 static void igmp_group_dropped(struct ip_mc_list *im)
1170 {
1171 struct in_device *in_dev = im->interface;
1172 #ifdef CONFIG_IP_MULTICAST
1173 int reporter;
1174 #endif
1175
1176 if (im->loaded) {
1177 im->loaded = 0;
1178 ip_mc_filter_del(in_dev, im->multiaddr);
1179 }
1180
1181 #ifdef CONFIG_IP_MULTICAST
1182 if (im->multiaddr == IGMP_ALL_HOSTS)
1183 return;
1184
1185 reporter = im->reporter;
1186 igmp_stop_timer(im);
1187
1188 if (!in_dev->dead) {
1189 if (IGMP_V1_SEEN(in_dev))
1190 return;
1191 if (IGMP_V2_SEEN(in_dev)) {
1192 if (reporter)
1193 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1194 return;
1195 }
1196 /* IGMPv3 */
1197 igmpv3_add_delrec(in_dev, im);
1198
1199 igmp_ifc_event(in_dev);
1200 }
1201 #endif
1202 }
1203
1204 static void igmp_group_added(struct ip_mc_list *im)
1205 {
1206 struct in_device *in_dev = im->interface;
1207
1208 if (im->loaded == 0) {
1209 im->loaded = 1;
1210 ip_mc_filter_add(in_dev, im->multiaddr);
1211 }
1212
1213 #ifdef CONFIG_IP_MULTICAST
1214 if (im->multiaddr == IGMP_ALL_HOSTS)
1215 return;
1216
1217 if (in_dev->dead)
1218 return;
1219 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1220 spin_lock_bh(&im->lock);
1221 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1222 spin_unlock_bh(&im->lock);
1223 return;
1224 }
1225 /* else, v3 */
1226
1227 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1228 igmp_ifc_event(in_dev);
1229 #endif
1230 }
1231
1232
1233 /*
1234 * Multicast list managers
1235 */
1236
1237 static u32 ip_mc_hash(const struct ip_mc_list *im)
1238 {
1239 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1240 }
1241
1242 static void ip_mc_hash_add(struct in_device *in_dev,
1243 struct ip_mc_list *im)
1244 {
1245 struct ip_mc_list __rcu **mc_hash;
1246 u32 hash;
1247
1248 mc_hash = rtnl_dereference(in_dev->mc_hash);
1249 if (mc_hash) {
1250 hash = ip_mc_hash(im);
1251 im->next_hash = mc_hash[hash];
1252 rcu_assign_pointer(mc_hash[hash], im);
1253 return;
1254 }
1255
1256 /* do not use a hash table for small number of items */
1257 if (in_dev->mc_count < 4)
1258 return;
1259
1260 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1261 GFP_KERNEL);
1262 if (!mc_hash)
1263 return;
1264
1265 for_each_pmc_rtnl(in_dev, im) {
1266 hash = ip_mc_hash(im);
1267 im->next_hash = mc_hash[hash];
1268 RCU_INIT_POINTER(mc_hash[hash], im);
1269 }
1270
1271 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1272 }
1273
1274 static void ip_mc_hash_remove(struct in_device *in_dev,
1275 struct ip_mc_list *im)
1276 {
1277 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1278 struct ip_mc_list *aux;
1279
1280 if (!mc_hash)
1281 return;
1282 mc_hash += ip_mc_hash(im);
1283 while ((aux = rtnl_dereference(*mc_hash)) != im)
1284 mc_hash = &aux->next_hash;
1285 *mc_hash = im->next_hash;
1286 }
1287
1288
1289 /*
1290 * A socket has joined a multicast group on device dev.
1291 */
1292
1293 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1294 {
1295 struct ip_mc_list *im;
1296
1297 ASSERT_RTNL();
1298
1299 for_each_pmc_rtnl(in_dev, im) {
1300 if (im->multiaddr == addr) {
1301 im->users++;
1302 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1303 goto out;
1304 }
1305 }
1306
1307 im = kzalloc(sizeof(*im), GFP_KERNEL);
1308 if (!im)
1309 goto out;
1310
1311 im->users = 1;
1312 im->interface = in_dev;
1313 in_dev_hold(in_dev);
1314 im->multiaddr = addr;
1315 /* initial mode is (EX, empty) */
1316 im->sfmode = MCAST_EXCLUDE;
1317 im->sfcount[MCAST_EXCLUDE] = 1;
1318 atomic_set(&im->refcnt, 1);
1319 spin_lock_init(&im->lock);
1320 #ifdef CONFIG_IP_MULTICAST
1321 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1322 im->unsolicit_count = sysctl_igmp_qrv;
1323 #endif
1324
1325 im->next_rcu = in_dev->mc_list;
1326 in_dev->mc_count++;
1327 rcu_assign_pointer(in_dev->mc_list, im);
1328
1329 ip_mc_hash_add(in_dev, im);
1330
1331 #ifdef CONFIG_IP_MULTICAST
1332 igmpv3_del_delrec(in_dev, im->multiaddr);
1333 #endif
1334 igmp_group_added(im);
1335 if (!in_dev->dead)
1336 ip_rt_multicast_event(in_dev);
1337 out:
1338 return;
1339 }
1340 EXPORT_SYMBOL(ip_mc_inc_group);
1341
1342 static int ip_mc_check_iphdr(struct sk_buff *skb)
1343 {
1344 const struct iphdr *iph;
1345 unsigned int len;
1346 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1347
1348 if (!pskb_may_pull(skb, offset))
1349 return -EINVAL;
1350
1351 iph = ip_hdr(skb);
1352
1353 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1354 return -EINVAL;
1355
1356 offset += ip_hdrlen(skb) - sizeof(*iph);
1357
1358 if (!pskb_may_pull(skb, offset))
1359 return -EINVAL;
1360
1361 iph = ip_hdr(skb);
1362
1363 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1364 return -EINVAL;
1365
1366 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1367 if (skb->len < len || len < offset)
1368 return -EINVAL;
1369
1370 skb_set_transport_header(skb, offset);
1371
1372 return 0;
1373 }
1374
1375 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1376 {
1377 unsigned int len = skb_transport_offset(skb);
1378
1379 len += sizeof(struct igmpv3_report);
1380
1381 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1382 }
1383
1384 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1385 {
1386 unsigned int len = skb_transport_offset(skb);
1387
1388 len += sizeof(struct igmphdr);
1389 if (skb->len < len)
1390 return -EINVAL;
1391
1392 /* IGMPv{1,2}? */
1393 if (skb->len != len) {
1394 /* or IGMPv3? */
1395 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1396 if (skb->len < len || !pskb_may_pull(skb, len))
1397 return -EINVAL;
1398 }
1399
1400 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1401 * all-systems destination addresses (224.0.0.1) for general queries
1402 */
1403 if (!igmp_hdr(skb)->group &&
1404 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1405 return -EINVAL;
1406
1407 return 0;
1408 }
1409
1410 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1411 {
1412 switch (igmp_hdr(skb)->type) {
1413 case IGMP_HOST_LEAVE_MESSAGE:
1414 case IGMP_HOST_MEMBERSHIP_REPORT:
1415 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1416 /* fall through */
1417 return 0;
1418 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1419 return ip_mc_check_igmp_reportv3(skb);
1420 case IGMP_HOST_MEMBERSHIP_QUERY:
1421 return ip_mc_check_igmp_query(skb);
1422 default:
1423 return -ENOMSG;
1424 }
1425 }
1426
1427 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1428 {
1429 return skb_checksum_simple_validate(skb);
1430 }
1431
1432 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1433
1434 {
1435 struct sk_buff *skb_chk;
1436 unsigned int transport_len;
1437 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1438 int ret;
1439
1440 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1441
1442 skb_get(skb);
1443 skb_chk = skb_checksum_trimmed(skb, transport_len,
1444 ip_mc_validate_checksum);
1445 if (!skb_chk)
1446 return -EINVAL;
1447
1448 if (!pskb_may_pull(skb_chk, len)) {
1449 kfree_skb(skb_chk);
1450 return -EINVAL;
1451 }
1452
1453 ret = ip_mc_check_igmp_msg(skb_chk);
1454 if (ret) {
1455 kfree_skb(skb_chk);
1456 return ret;
1457 }
1458
1459 if (skb_trimmed)
1460 *skb_trimmed = skb_chk;
1461 else
1462 kfree_skb(skb_chk);
1463
1464 return 0;
1465 }
1466
1467 /**
1468 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1469 * @skb: the skb to validate
1470 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1471 *
1472 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1473 * skb network and transport headers accordingly and returns zero.
1474 *
1475 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1476 * standard
1477 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1478 * -ENOMEM: A memory allocation failure happened.
1479 *
1480 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1481 * to NULL): After parsing an IGMP packet successfully it will point to
1482 * an skb which has its tail aligned to the IP packet end. This might
1483 * either be the originally provided skb or a trimmed, cloned version if
1484 * the skb frame had data beyond the IP packet. A cloned skb allows us
1485 * to leave the original skb and its full frame unchanged (which might be
1486 * desirable for layer 2 frame jugglers).
1487 *
1488 * The caller needs to release a reference count from any returned skb_trimmed.
1489 */
1490 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1491 {
1492 int ret = ip_mc_check_iphdr(skb);
1493
1494 if (ret < 0)
1495 return ret;
1496
1497 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1498 return -ENOMSG;
1499
1500 return __ip_mc_check_igmp(skb, skb_trimmed);
1501 }
1502 EXPORT_SYMBOL(ip_mc_check_igmp);
1503
1504 /*
1505 * Resend IGMP JOIN report; used by netdev notifier.
1506 */
1507 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1508 {
1509 #ifdef CONFIG_IP_MULTICAST
1510 struct ip_mc_list *im;
1511 int type;
1512
1513 ASSERT_RTNL();
1514
1515 for_each_pmc_rtnl(in_dev, im) {
1516 if (im->multiaddr == IGMP_ALL_HOSTS)
1517 continue;
1518
1519 /* a failover is happening and switches
1520 * must be notified immediately
1521 */
1522 if (IGMP_V1_SEEN(in_dev))
1523 type = IGMP_HOST_MEMBERSHIP_REPORT;
1524 else if (IGMP_V2_SEEN(in_dev))
1525 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1526 else
1527 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1528 igmp_send_report(in_dev, im, type);
1529 }
1530 #endif
1531 }
1532
1533 /*
1534 * A socket has left a multicast group on device dev
1535 */
1536
1537 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1538 {
1539 struct ip_mc_list *i;
1540 struct ip_mc_list __rcu **ip;
1541
1542 ASSERT_RTNL();
1543
1544 for (ip = &in_dev->mc_list;
1545 (i = rtnl_dereference(*ip)) != NULL;
1546 ip = &i->next_rcu) {
1547 if (i->multiaddr == addr) {
1548 if (--i->users == 0) {
1549 ip_mc_hash_remove(in_dev, i);
1550 *ip = i->next_rcu;
1551 in_dev->mc_count--;
1552 igmp_group_dropped(i);
1553 ip_mc_clear_src(i);
1554
1555 if (!in_dev->dead)
1556 ip_rt_multicast_event(in_dev);
1557
1558 ip_ma_put(i);
1559 return;
1560 }
1561 break;
1562 }
1563 }
1564 }
1565 EXPORT_SYMBOL(ip_mc_dec_group);
1566
1567 /* Device changing type */
1568
1569 void ip_mc_unmap(struct in_device *in_dev)
1570 {
1571 struct ip_mc_list *pmc;
1572
1573 ASSERT_RTNL();
1574
1575 for_each_pmc_rtnl(in_dev, pmc)
1576 igmp_group_dropped(pmc);
1577 }
1578
1579 void ip_mc_remap(struct in_device *in_dev)
1580 {
1581 struct ip_mc_list *pmc;
1582
1583 ASSERT_RTNL();
1584
1585 for_each_pmc_rtnl(in_dev, pmc)
1586 igmp_group_added(pmc);
1587 }
1588
1589 /* Device going down */
1590
1591 void ip_mc_down(struct in_device *in_dev)
1592 {
1593 struct ip_mc_list *pmc;
1594
1595 ASSERT_RTNL();
1596
1597 for_each_pmc_rtnl(in_dev, pmc)
1598 igmp_group_dropped(pmc);
1599
1600 #ifdef CONFIG_IP_MULTICAST
1601 in_dev->mr_ifc_count = 0;
1602 if (del_timer(&in_dev->mr_ifc_timer))
1603 __in_dev_put(in_dev);
1604 in_dev->mr_gq_running = 0;
1605 if (del_timer(&in_dev->mr_gq_timer))
1606 __in_dev_put(in_dev);
1607 igmpv3_clear_delrec(in_dev);
1608 #endif
1609
1610 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1611 }
1612
1613 void ip_mc_init_dev(struct in_device *in_dev)
1614 {
1615 ASSERT_RTNL();
1616
1617 #ifdef CONFIG_IP_MULTICAST
1618 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1619 (unsigned long)in_dev);
1620 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1621 (unsigned long)in_dev);
1622 in_dev->mr_qrv = sysctl_igmp_qrv;
1623 #endif
1624
1625 spin_lock_init(&in_dev->mc_tomb_lock);
1626 }
1627
1628 /* Device going up */
1629
1630 void ip_mc_up(struct in_device *in_dev)
1631 {
1632 struct ip_mc_list *pmc;
1633
1634 ASSERT_RTNL();
1635
1636 #ifdef CONFIG_IP_MULTICAST
1637 in_dev->mr_qrv = sysctl_igmp_qrv;
1638 #endif
1639 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1640
1641 for_each_pmc_rtnl(in_dev, pmc)
1642 igmp_group_added(pmc);
1643 }
1644
1645 /*
1646 * Device is about to be destroyed: clean up.
1647 */
1648
1649 void ip_mc_destroy_dev(struct in_device *in_dev)
1650 {
1651 struct ip_mc_list *i;
1652
1653 ASSERT_RTNL();
1654
1655 /* Deactivate timers */
1656 ip_mc_down(in_dev);
1657
1658 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1659 in_dev->mc_list = i->next_rcu;
1660 in_dev->mc_count--;
1661
1662 /* We've dropped the groups in ip_mc_down already */
1663 ip_mc_clear_src(i);
1664 ip_ma_put(i);
1665 }
1666 }
1667
1668 /* RTNL is locked */
1669 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1670 {
1671 struct net_device *dev = NULL;
1672 struct in_device *idev = NULL;
1673
1674 if (imr->imr_ifindex) {
1675 idev = inetdev_by_index(net, imr->imr_ifindex);
1676 return idev;
1677 }
1678 if (imr->imr_address.s_addr) {
1679 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1680 if (!dev)
1681 return NULL;
1682 }
1683
1684 if (!dev) {
1685 struct rtable *rt = ip_route_output(net,
1686 imr->imr_multiaddr.s_addr,
1687 0, 0, 0);
1688 if (!IS_ERR(rt)) {
1689 dev = rt->dst.dev;
1690 ip_rt_put(rt);
1691 }
1692 }
1693 if (dev) {
1694 imr->imr_ifindex = dev->ifindex;
1695 idev = __in_dev_get_rtnl(dev);
1696 }
1697 return idev;
1698 }
1699
1700 /*
1701 * Join a socket to a group
1702 */
1703 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1704 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1705 #ifdef CONFIG_IP_MULTICAST
1706 int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE;
1707 #endif
1708
1709 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1710 __be32 *psfsrc)
1711 {
1712 struct ip_sf_list *psf, *psf_prev;
1713 int rv = 0;
1714
1715 psf_prev = NULL;
1716 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1717 if (psf->sf_inaddr == *psfsrc)
1718 break;
1719 psf_prev = psf;
1720 }
1721 if (!psf || psf->sf_count[sfmode] == 0) {
1722 /* source filter not found, or count wrong => bug */
1723 return -ESRCH;
1724 }
1725 psf->sf_count[sfmode]--;
1726 if (psf->sf_count[sfmode] == 0) {
1727 ip_rt_multicast_event(pmc->interface);
1728 }
1729 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1730 #ifdef CONFIG_IP_MULTICAST
1731 struct in_device *in_dev = pmc->interface;
1732 #endif
1733
1734 /* no more filters for this source */
1735 if (psf_prev)
1736 psf_prev->sf_next = psf->sf_next;
1737 else
1738 pmc->sources = psf->sf_next;
1739 #ifdef CONFIG_IP_MULTICAST
1740 if (psf->sf_oldin &&
1741 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1742 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1743 psf->sf_next = pmc->tomb;
1744 pmc->tomb = psf;
1745 rv = 1;
1746 } else
1747 #endif
1748 kfree(psf);
1749 }
1750 return rv;
1751 }
1752
1753 #ifndef CONFIG_IP_MULTICAST
1754 #define igmp_ifc_event(x) do { } while (0)
1755 #endif
1756
1757 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1758 int sfcount, __be32 *psfsrc, int delta)
1759 {
1760 struct ip_mc_list *pmc;
1761 int changerec = 0;
1762 int i, err;
1763
1764 if (!in_dev)
1765 return -ENODEV;
1766 rcu_read_lock();
1767 for_each_pmc_rcu(in_dev, pmc) {
1768 if (*pmca == pmc->multiaddr)
1769 break;
1770 }
1771 if (!pmc) {
1772 /* MCA not found?? bug */
1773 rcu_read_unlock();
1774 return -ESRCH;
1775 }
1776 spin_lock_bh(&pmc->lock);
1777 rcu_read_unlock();
1778 #ifdef CONFIG_IP_MULTICAST
1779 sf_markstate(pmc);
1780 #endif
1781 if (!delta) {
1782 err = -EINVAL;
1783 if (!pmc->sfcount[sfmode])
1784 goto out_unlock;
1785 pmc->sfcount[sfmode]--;
1786 }
1787 err = 0;
1788 for (i = 0; i < sfcount; i++) {
1789 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1790
1791 changerec |= rv > 0;
1792 if (!err && rv < 0)
1793 err = rv;
1794 }
1795 if (pmc->sfmode == MCAST_EXCLUDE &&
1796 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1797 pmc->sfcount[MCAST_INCLUDE]) {
1798 #ifdef CONFIG_IP_MULTICAST
1799 struct ip_sf_list *psf;
1800 #endif
1801
1802 /* filter mode change */
1803 pmc->sfmode = MCAST_INCLUDE;
1804 #ifdef CONFIG_IP_MULTICAST
1805 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1806 in_dev->mr_ifc_count = pmc->crcount;
1807 for (psf = pmc->sources; psf; psf = psf->sf_next)
1808 psf->sf_crcount = 0;
1809 igmp_ifc_event(pmc->interface);
1810 } else if (sf_setstate(pmc) || changerec) {
1811 igmp_ifc_event(pmc->interface);
1812 #endif
1813 }
1814 out_unlock:
1815 spin_unlock_bh(&pmc->lock);
1816 return err;
1817 }
1818
1819 /*
1820 * Add multicast single-source filter to the interface list
1821 */
1822 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1823 __be32 *psfsrc)
1824 {
1825 struct ip_sf_list *psf, *psf_prev;
1826
1827 psf_prev = NULL;
1828 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1829 if (psf->sf_inaddr == *psfsrc)
1830 break;
1831 psf_prev = psf;
1832 }
1833 if (!psf) {
1834 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1835 if (!psf)
1836 return -ENOBUFS;
1837 psf->sf_inaddr = *psfsrc;
1838 if (psf_prev) {
1839 psf_prev->sf_next = psf;
1840 } else
1841 pmc->sources = psf;
1842 }
1843 psf->sf_count[sfmode]++;
1844 if (psf->sf_count[sfmode] == 1) {
1845 ip_rt_multicast_event(pmc->interface);
1846 }
1847 return 0;
1848 }
1849
1850 #ifdef CONFIG_IP_MULTICAST
1851 static void sf_markstate(struct ip_mc_list *pmc)
1852 {
1853 struct ip_sf_list *psf;
1854 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1855
1856 for (psf = pmc->sources; psf; psf = psf->sf_next)
1857 if (pmc->sfcount[MCAST_EXCLUDE]) {
1858 psf->sf_oldin = mca_xcount ==
1859 psf->sf_count[MCAST_EXCLUDE] &&
1860 !psf->sf_count[MCAST_INCLUDE];
1861 } else
1862 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1863 }
1864
1865 static int sf_setstate(struct ip_mc_list *pmc)
1866 {
1867 struct ip_sf_list *psf, *dpsf;
1868 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1869 int qrv = pmc->interface->mr_qrv;
1870 int new_in, rv;
1871
1872 rv = 0;
1873 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1874 if (pmc->sfcount[MCAST_EXCLUDE]) {
1875 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1876 !psf->sf_count[MCAST_INCLUDE];
1877 } else
1878 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1879 if (new_in) {
1880 if (!psf->sf_oldin) {
1881 struct ip_sf_list *prev = NULL;
1882
1883 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1884 if (dpsf->sf_inaddr == psf->sf_inaddr)
1885 break;
1886 prev = dpsf;
1887 }
1888 if (dpsf) {
1889 if (prev)
1890 prev->sf_next = dpsf->sf_next;
1891 else
1892 pmc->tomb = dpsf->sf_next;
1893 kfree(dpsf);
1894 }
1895 psf->sf_crcount = qrv;
1896 rv++;
1897 }
1898 } else if (psf->sf_oldin) {
1899
1900 psf->sf_crcount = 0;
1901 /*
1902 * add or update "delete" records if an active filter
1903 * is now inactive
1904 */
1905 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1906 if (dpsf->sf_inaddr == psf->sf_inaddr)
1907 break;
1908 if (!dpsf) {
1909 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1910 if (!dpsf)
1911 continue;
1912 *dpsf = *psf;
1913 /* pmc->lock held by callers */
1914 dpsf->sf_next = pmc->tomb;
1915 pmc->tomb = dpsf;
1916 }
1917 dpsf->sf_crcount = qrv;
1918 rv++;
1919 }
1920 }
1921 return rv;
1922 }
1923 #endif
1924
1925 /*
1926 * Add multicast source filter list to the interface list
1927 */
1928 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1929 int sfcount, __be32 *psfsrc, int delta)
1930 {
1931 struct ip_mc_list *pmc;
1932 int isexclude;
1933 int i, err;
1934
1935 if (!in_dev)
1936 return -ENODEV;
1937 rcu_read_lock();
1938 for_each_pmc_rcu(in_dev, pmc) {
1939 if (*pmca == pmc->multiaddr)
1940 break;
1941 }
1942 if (!pmc) {
1943 /* MCA not found?? bug */
1944 rcu_read_unlock();
1945 return -ESRCH;
1946 }
1947 spin_lock_bh(&pmc->lock);
1948 rcu_read_unlock();
1949
1950 #ifdef CONFIG_IP_MULTICAST
1951 sf_markstate(pmc);
1952 #endif
1953 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1954 if (!delta)
1955 pmc->sfcount[sfmode]++;
1956 err = 0;
1957 for (i = 0; i < sfcount; i++) {
1958 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1959 if (err)
1960 break;
1961 }
1962 if (err) {
1963 int j;
1964
1965 if (!delta)
1966 pmc->sfcount[sfmode]--;
1967 for (j = 0; j < i; j++)
1968 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1969 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1970 #ifdef CONFIG_IP_MULTICAST
1971 struct ip_sf_list *psf;
1972 in_dev = pmc->interface;
1973 #endif
1974
1975 /* filter mode change */
1976 if (pmc->sfcount[MCAST_EXCLUDE])
1977 pmc->sfmode = MCAST_EXCLUDE;
1978 else if (pmc->sfcount[MCAST_INCLUDE])
1979 pmc->sfmode = MCAST_INCLUDE;
1980 #ifdef CONFIG_IP_MULTICAST
1981 /* else no filters; keep old mode for reports */
1982
1983 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1984 in_dev->mr_ifc_count = pmc->crcount;
1985 for (psf = pmc->sources; psf; psf = psf->sf_next)
1986 psf->sf_crcount = 0;
1987 igmp_ifc_event(in_dev);
1988 } else if (sf_setstate(pmc)) {
1989 igmp_ifc_event(in_dev);
1990 #endif
1991 }
1992 spin_unlock_bh(&pmc->lock);
1993 return err;
1994 }
1995
1996 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1997 {
1998 struct ip_sf_list *psf, *nextpsf;
1999
2000 for (psf = pmc->tomb; psf; psf = nextpsf) {
2001 nextpsf = psf->sf_next;
2002 kfree(psf);
2003 }
2004 pmc->tomb = NULL;
2005 for (psf = pmc->sources; psf; psf = nextpsf) {
2006 nextpsf = psf->sf_next;
2007 kfree(psf);
2008 }
2009 pmc->sources = NULL;
2010 pmc->sfmode = MCAST_EXCLUDE;
2011 pmc->sfcount[MCAST_INCLUDE] = 0;
2012 pmc->sfcount[MCAST_EXCLUDE] = 1;
2013 }
2014
2015 /* Join a multicast group
2016 */
2017
2018 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2019 {
2020 __be32 addr = imr->imr_multiaddr.s_addr;
2021 struct ip_mc_socklist *iml, *i;
2022 struct in_device *in_dev;
2023 struct inet_sock *inet = inet_sk(sk);
2024 struct net *net = sock_net(sk);
2025 int ifindex;
2026 int count = 0;
2027 int err;
2028
2029 ASSERT_RTNL();
2030
2031 if (!ipv4_is_multicast(addr))
2032 return -EINVAL;
2033
2034 in_dev = ip_mc_find_dev(net, imr);
2035
2036 if (!in_dev) {
2037 err = -ENODEV;
2038 goto done;
2039 }
2040
2041 err = -EADDRINUSE;
2042 ifindex = imr->imr_ifindex;
2043 for_each_pmc_rtnl(inet, i) {
2044 if (i->multi.imr_multiaddr.s_addr == addr &&
2045 i->multi.imr_ifindex == ifindex)
2046 goto done;
2047 count++;
2048 }
2049 err = -ENOBUFS;
2050 if (count >= sysctl_igmp_max_memberships)
2051 goto done;
2052 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2053 if (!iml)
2054 goto done;
2055
2056 memcpy(&iml->multi, imr, sizeof(*imr));
2057 iml->next_rcu = inet->mc_list;
2058 iml->sflist = NULL;
2059 iml->sfmode = MCAST_EXCLUDE;
2060 rcu_assign_pointer(inet->mc_list, iml);
2061 ip_mc_inc_group(in_dev, addr);
2062 err = 0;
2063 done:
2064 return err;
2065 }
2066 EXPORT_SYMBOL(ip_mc_join_group);
2067
2068 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2069 struct in_device *in_dev)
2070 {
2071 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2072 int err;
2073
2074 if (!psf) {
2075 /* any-source empty exclude case */
2076 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2077 iml->sfmode, 0, NULL, 0);
2078 }
2079 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2080 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2081 RCU_INIT_POINTER(iml->sflist, NULL);
2082 /* decrease mem now to avoid the memleak warning */
2083 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2084 kfree_rcu(psf, rcu);
2085 return err;
2086 }
2087
2088 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2089 {
2090 struct inet_sock *inet = inet_sk(sk);
2091 struct ip_mc_socklist *iml;
2092 struct ip_mc_socklist __rcu **imlp;
2093 struct in_device *in_dev;
2094 struct net *net = sock_net(sk);
2095 __be32 group = imr->imr_multiaddr.s_addr;
2096 u32 ifindex;
2097 int ret = -EADDRNOTAVAIL;
2098
2099 ASSERT_RTNL();
2100
2101 in_dev = ip_mc_find_dev(net, imr);
2102 if (!in_dev) {
2103 ret = -ENODEV;
2104 goto out;
2105 }
2106 ifindex = imr->imr_ifindex;
2107 for (imlp = &inet->mc_list;
2108 (iml = rtnl_dereference(*imlp)) != NULL;
2109 imlp = &iml->next_rcu) {
2110 if (iml->multi.imr_multiaddr.s_addr != group)
2111 continue;
2112 if (ifindex) {
2113 if (iml->multi.imr_ifindex != ifindex)
2114 continue;
2115 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2116 iml->multi.imr_address.s_addr)
2117 continue;
2118
2119 (void) ip_mc_leave_src(sk, iml, in_dev);
2120
2121 *imlp = iml->next_rcu;
2122
2123 ip_mc_dec_group(in_dev, group);
2124
2125 /* decrease mem now to avoid the memleak warning */
2126 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2127 kfree_rcu(iml, rcu);
2128 return 0;
2129 }
2130 out:
2131 return ret;
2132 }
2133 EXPORT_SYMBOL(ip_mc_leave_group);
2134
2135 int ip_mc_source(int add, int omode, struct sock *sk, struct
2136 ip_mreq_source *mreqs, int ifindex)
2137 {
2138 int err;
2139 struct ip_mreqn imr;
2140 __be32 addr = mreqs->imr_multiaddr;
2141 struct ip_mc_socklist *pmc;
2142 struct in_device *in_dev = NULL;
2143 struct inet_sock *inet = inet_sk(sk);
2144 struct ip_sf_socklist *psl;
2145 struct net *net = sock_net(sk);
2146 int leavegroup = 0;
2147 int i, j, rv;
2148
2149 if (!ipv4_is_multicast(addr))
2150 return -EINVAL;
2151
2152 ASSERT_RTNL();
2153
2154 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2155 imr.imr_address.s_addr = mreqs->imr_interface;
2156 imr.imr_ifindex = ifindex;
2157 in_dev = ip_mc_find_dev(net, &imr);
2158
2159 if (!in_dev) {
2160 err = -ENODEV;
2161 goto done;
2162 }
2163 err = -EADDRNOTAVAIL;
2164
2165 for_each_pmc_rtnl(inet, pmc) {
2166 if ((pmc->multi.imr_multiaddr.s_addr ==
2167 imr.imr_multiaddr.s_addr) &&
2168 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2169 break;
2170 }
2171 if (!pmc) { /* must have a prior join */
2172 err = -EINVAL;
2173 goto done;
2174 }
2175 /* if a source filter was set, must be the same mode as before */
2176 if (pmc->sflist) {
2177 if (pmc->sfmode != omode) {
2178 err = -EINVAL;
2179 goto done;
2180 }
2181 } else if (pmc->sfmode != omode) {
2182 /* allow mode switches for empty-set filters */
2183 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2184 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2185 NULL, 0);
2186 pmc->sfmode = omode;
2187 }
2188
2189 psl = rtnl_dereference(pmc->sflist);
2190 if (!add) {
2191 if (!psl)
2192 goto done; /* err = -EADDRNOTAVAIL */
2193 rv = !0;
2194 for (i = 0; i < psl->sl_count; i++) {
2195 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2196 sizeof(__be32));
2197 if (rv == 0)
2198 break;
2199 }
2200 if (rv) /* source not found */
2201 goto done; /* err = -EADDRNOTAVAIL */
2202
2203 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2204 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2205 leavegroup = 1;
2206 goto done;
2207 }
2208
2209 /* update the interface filter */
2210 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2211 &mreqs->imr_sourceaddr, 1);
2212
2213 for (j = i+1; j < psl->sl_count; j++)
2214 psl->sl_addr[j-1] = psl->sl_addr[j];
2215 psl->sl_count--;
2216 err = 0;
2217 goto done;
2218 }
2219 /* else, add a new source to the filter */
2220
2221 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2222 err = -ENOBUFS;
2223 goto done;
2224 }
2225 if (!psl || psl->sl_count == psl->sl_max) {
2226 struct ip_sf_socklist *newpsl;
2227 int count = IP_SFBLOCK;
2228
2229 if (psl)
2230 count += psl->sl_max;
2231 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2232 if (!newpsl) {
2233 err = -ENOBUFS;
2234 goto done;
2235 }
2236 newpsl->sl_max = count;
2237 newpsl->sl_count = count - IP_SFBLOCK;
2238 if (psl) {
2239 for (i = 0; i < psl->sl_count; i++)
2240 newpsl->sl_addr[i] = psl->sl_addr[i];
2241 /* decrease mem now to avoid the memleak warning */
2242 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2243 kfree_rcu(psl, rcu);
2244 }
2245 rcu_assign_pointer(pmc->sflist, newpsl);
2246 psl = newpsl;
2247 }
2248 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2249 for (i = 0; i < psl->sl_count; i++) {
2250 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2251 sizeof(__be32));
2252 if (rv == 0)
2253 break;
2254 }
2255 if (rv == 0) /* address already there is an error */
2256 goto done;
2257 for (j = psl->sl_count-1; j >= i; j--)
2258 psl->sl_addr[j+1] = psl->sl_addr[j];
2259 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2260 psl->sl_count++;
2261 err = 0;
2262 /* update the interface list */
2263 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2264 &mreqs->imr_sourceaddr, 1);
2265 done:
2266 if (leavegroup)
2267 err = ip_mc_leave_group(sk, &imr);
2268 return err;
2269 }
2270
2271 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2272 {
2273 int err = 0;
2274 struct ip_mreqn imr;
2275 __be32 addr = msf->imsf_multiaddr;
2276 struct ip_mc_socklist *pmc;
2277 struct in_device *in_dev;
2278 struct inet_sock *inet = inet_sk(sk);
2279 struct ip_sf_socklist *newpsl, *psl;
2280 struct net *net = sock_net(sk);
2281 int leavegroup = 0;
2282
2283 if (!ipv4_is_multicast(addr))
2284 return -EINVAL;
2285 if (msf->imsf_fmode != MCAST_INCLUDE &&
2286 msf->imsf_fmode != MCAST_EXCLUDE)
2287 return -EINVAL;
2288
2289 ASSERT_RTNL();
2290
2291 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2292 imr.imr_address.s_addr = msf->imsf_interface;
2293 imr.imr_ifindex = ifindex;
2294 in_dev = ip_mc_find_dev(net, &imr);
2295
2296 if (!in_dev) {
2297 err = -ENODEV;
2298 goto done;
2299 }
2300
2301 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2302 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2303 leavegroup = 1;
2304 goto done;
2305 }
2306
2307 for_each_pmc_rtnl(inet, pmc) {
2308 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2309 pmc->multi.imr_ifindex == imr.imr_ifindex)
2310 break;
2311 }
2312 if (!pmc) { /* must have a prior join */
2313 err = -EINVAL;
2314 goto done;
2315 }
2316 if (msf->imsf_numsrc) {
2317 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2318 GFP_KERNEL);
2319 if (!newpsl) {
2320 err = -ENOBUFS;
2321 goto done;
2322 }
2323 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2324 memcpy(newpsl->sl_addr, msf->imsf_slist,
2325 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2326 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2327 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2328 if (err) {
2329 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2330 goto done;
2331 }
2332 } else {
2333 newpsl = NULL;
2334 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2335 msf->imsf_fmode, 0, NULL, 0);
2336 }
2337 psl = rtnl_dereference(pmc->sflist);
2338 if (psl) {
2339 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2340 psl->sl_count, psl->sl_addr, 0);
2341 /* decrease mem now to avoid the memleak warning */
2342 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2343 kfree_rcu(psl, rcu);
2344 } else
2345 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2346 0, NULL, 0);
2347 rcu_assign_pointer(pmc->sflist, newpsl);
2348 pmc->sfmode = msf->imsf_fmode;
2349 err = 0;
2350 done:
2351 if (leavegroup)
2352 err = ip_mc_leave_group(sk, &imr);
2353 return err;
2354 }
2355
2356 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2357 struct ip_msfilter __user *optval, int __user *optlen)
2358 {
2359 int err, len, count, copycount;
2360 struct ip_mreqn imr;
2361 __be32 addr = msf->imsf_multiaddr;
2362 struct ip_mc_socklist *pmc;
2363 struct in_device *in_dev;
2364 struct inet_sock *inet = inet_sk(sk);
2365 struct ip_sf_socklist *psl;
2366 struct net *net = sock_net(sk);
2367
2368 if (!ipv4_is_multicast(addr))
2369 return -EINVAL;
2370
2371 rtnl_lock();
2372
2373 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2374 imr.imr_address.s_addr = msf->imsf_interface;
2375 imr.imr_ifindex = 0;
2376 in_dev = ip_mc_find_dev(net, &imr);
2377
2378 if (!in_dev) {
2379 err = -ENODEV;
2380 goto done;
2381 }
2382 err = -EADDRNOTAVAIL;
2383
2384 for_each_pmc_rtnl(inet, pmc) {
2385 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2386 pmc->multi.imr_ifindex == imr.imr_ifindex)
2387 break;
2388 }
2389 if (!pmc) /* must have a prior join */
2390 goto done;
2391 msf->imsf_fmode = pmc->sfmode;
2392 psl = rtnl_dereference(pmc->sflist);
2393 rtnl_unlock();
2394 if (!psl) {
2395 len = 0;
2396 count = 0;
2397 } else {
2398 count = psl->sl_count;
2399 }
2400 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2401 len = copycount * sizeof(psl->sl_addr[0]);
2402 msf->imsf_numsrc = count;
2403 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2404 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2405 return -EFAULT;
2406 }
2407 if (len &&
2408 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2409 return -EFAULT;
2410 return 0;
2411 done:
2412 rtnl_unlock();
2413 return err;
2414 }
2415
2416 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2417 struct group_filter __user *optval, int __user *optlen)
2418 {
2419 int err, i, count, copycount;
2420 struct sockaddr_in *psin;
2421 __be32 addr;
2422 struct ip_mc_socklist *pmc;
2423 struct inet_sock *inet = inet_sk(sk);
2424 struct ip_sf_socklist *psl;
2425
2426 psin = (struct sockaddr_in *)&gsf->gf_group;
2427 if (psin->sin_family != AF_INET)
2428 return -EINVAL;
2429 addr = psin->sin_addr.s_addr;
2430 if (!ipv4_is_multicast(addr))
2431 return -EINVAL;
2432
2433 rtnl_lock();
2434
2435 err = -EADDRNOTAVAIL;
2436
2437 for_each_pmc_rtnl(inet, pmc) {
2438 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2439 pmc->multi.imr_ifindex == gsf->gf_interface)
2440 break;
2441 }
2442 if (!pmc) /* must have a prior join */
2443 goto done;
2444 gsf->gf_fmode = pmc->sfmode;
2445 psl = rtnl_dereference(pmc->sflist);
2446 rtnl_unlock();
2447 count = psl ? psl->sl_count : 0;
2448 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2449 gsf->gf_numsrc = count;
2450 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2451 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2452 return -EFAULT;
2453 }
2454 for (i = 0; i < copycount; i++) {
2455 struct sockaddr_storage ss;
2456
2457 psin = (struct sockaddr_in *)&ss;
2458 memset(&ss, 0, sizeof(ss));
2459 psin->sin_family = AF_INET;
2460 psin->sin_addr.s_addr = psl->sl_addr[i];
2461 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2462 return -EFAULT;
2463 }
2464 return 0;
2465 done:
2466 rtnl_unlock();
2467 return err;
2468 }
2469
2470 /*
2471 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2472 */
2473 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2474 {
2475 struct inet_sock *inet = inet_sk(sk);
2476 struct ip_mc_socklist *pmc;
2477 struct ip_sf_socklist *psl;
2478 int i;
2479 int ret;
2480
2481 ret = 1;
2482 if (!ipv4_is_multicast(loc_addr))
2483 goto out;
2484
2485 rcu_read_lock();
2486 for_each_pmc_rcu(inet, pmc) {
2487 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2488 pmc->multi.imr_ifindex == dif)
2489 break;
2490 }
2491 ret = inet->mc_all;
2492 if (!pmc)
2493 goto unlock;
2494 psl = rcu_dereference(pmc->sflist);
2495 ret = (pmc->sfmode == MCAST_EXCLUDE);
2496 if (!psl)
2497 goto unlock;
2498
2499 for (i = 0; i < psl->sl_count; i++) {
2500 if (psl->sl_addr[i] == rmt_addr)
2501 break;
2502 }
2503 ret = 0;
2504 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2505 goto unlock;
2506 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2507 goto unlock;
2508 ret = 1;
2509 unlock:
2510 rcu_read_unlock();
2511 out:
2512 return ret;
2513 }
2514
2515 /*
2516 * A socket is closing.
2517 */
2518
2519 void ip_mc_drop_socket(struct sock *sk)
2520 {
2521 struct inet_sock *inet = inet_sk(sk);
2522 struct ip_mc_socklist *iml;
2523 struct net *net = sock_net(sk);
2524
2525 if (!inet->mc_list)
2526 return;
2527
2528 rtnl_lock();
2529 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2530 struct in_device *in_dev;
2531
2532 inet->mc_list = iml->next_rcu;
2533 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2534 (void) ip_mc_leave_src(sk, iml, in_dev);
2535 if (in_dev)
2536 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2537 /* decrease mem now to avoid the memleak warning */
2538 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2539 kfree_rcu(iml, rcu);
2540 }
2541 rtnl_unlock();
2542 }
2543
2544 /* called with rcu_read_lock() */
2545 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2546 {
2547 struct ip_mc_list *im;
2548 struct ip_mc_list __rcu **mc_hash;
2549 struct ip_sf_list *psf;
2550 int rv = 0;
2551
2552 mc_hash = rcu_dereference(in_dev->mc_hash);
2553 if (mc_hash) {
2554 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2555
2556 for (im = rcu_dereference(mc_hash[hash]);
2557 im != NULL;
2558 im = rcu_dereference(im->next_hash)) {
2559 if (im->multiaddr == mc_addr)
2560 break;
2561 }
2562 } else {
2563 for_each_pmc_rcu(in_dev, im) {
2564 if (im->multiaddr == mc_addr)
2565 break;
2566 }
2567 }
2568 if (im && proto == IPPROTO_IGMP) {
2569 rv = 1;
2570 } else if (im) {
2571 if (src_addr) {
2572 for (psf = im->sources; psf; psf = psf->sf_next) {
2573 if (psf->sf_inaddr == src_addr)
2574 break;
2575 }
2576 if (psf)
2577 rv = psf->sf_count[MCAST_INCLUDE] ||
2578 psf->sf_count[MCAST_EXCLUDE] !=
2579 im->sfcount[MCAST_EXCLUDE];
2580 else
2581 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2582 } else
2583 rv = 1; /* unspecified source; tentatively allow */
2584 }
2585 return rv;
2586 }
2587
2588 #if defined(CONFIG_PROC_FS)
2589 struct igmp_mc_iter_state {
2590 struct seq_net_private p;
2591 struct net_device *dev;
2592 struct in_device *in_dev;
2593 };
2594
2595 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2596
2597 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2598 {
2599 struct net *net = seq_file_net(seq);
2600 struct ip_mc_list *im = NULL;
2601 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2602
2603 state->in_dev = NULL;
2604 for_each_netdev_rcu(net, state->dev) {
2605 struct in_device *in_dev;
2606
2607 in_dev = __in_dev_get_rcu(state->dev);
2608 if (!in_dev)
2609 continue;
2610 im = rcu_dereference(in_dev->mc_list);
2611 if (im) {
2612 state->in_dev = in_dev;
2613 break;
2614 }
2615 }
2616 return im;
2617 }
2618
2619 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2620 {
2621 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2622
2623 im = rcu_dereference(im->next_rcu);
2624 while (!im) {
2625 state->dev = next_net_device_rcu(state->dev);
2626 if (!state->dev) {
2627 state->in_dev = NULL;
2628 break;
2629 }
2630 state->in_dev = __in_dev_get_rcu(state->dev);
2631 if (!state->in_dev)
2632 continue;
2633 im = rcu_dereference(state->in_dev->mc_list);
2634 }
2635 return im;
2636 }
2637
2638 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2639 {
2640 struct ip_mc_list *im = igmp_mc_get_first(seq);
2641 if (im)
2642 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2643 --pos;
2644 return pos ? NULL : im;
2645 }
2646
2647 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2648 __acquires(rcu)
2649 {
2650 rcu_read_lock();
2651 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2652 }
2653
2654 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2655 {
2656 struct ip_mc_list *im;
2657 if (v == SEQ_START_TOKEN)
2658 im = igmp_mc_get_first(seq);
2659 else
2660 im = igmp_mc_get_next(seq, v);
2661 ++*pos;
2662 return im;
2663 }
2664
2665 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2666 __releases(rcu)
2667 {
2668 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2669
2670 state->in_dev = NULL;
2671 state->dev = NULL;
2672 rcu_read_unlock();
2673 }
2674
2675 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2676 {
2677 if (v == SEQ_START_TOKEN)
2678 seq_puts(seq,
2679 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2680 else {
2681 struct ip_mc_list *im = (struct ip_mc_list *)v;
2682 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2683 char *querier;
2684 long delta;
2685
2686 #ifdef CONFIG_IP_MULTICAST
2687 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2688 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2689 "V3";
2690 #else
2691 querier = "NONE";
2692 #endif
2693
2694 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2695 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2696 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2697 }
2698
2699 delta = im->timer.expires - jiffies;
2700 seq_printf(seq,
2701 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2702 im->multiaddr, im->users,
2703 im->tm_running,
2704 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2705 im->reporter);
2706 }
2707 return 0;
2708 }
2709
2710 static const struct seq_operations igmp_mc_seq_ops = {
2711 .start = igmp_mc_seq_start,
2712 .next = igmp_mc_seq_next,
2713 .stop = igmp_mc_seq_stop,
2714 .show = igmp_mc_seq_show,
2715 };
2716
2717 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2718 {
2719 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2720 sizeof(struct igmp_mc_iter_state));
2721 }
2722
2723 static const struct file_operations igmp_mc_seq_fops = {
2724 .owner = THIS_MODULE,
2725 .open = igmp_mc_seq_open,
2726 .read = seq_read,
2727 .llseek = seq_lseek,
2728 .release = seq_release_net,
2729 };
2730
2731 struct igmp_mcf_iter_state {
2732 struct seq_net_private p;
2733 struct net_device *dev;
2734 struct in_device *idev;
2735 struct ip_mc_list *im;
2736 };
2737
2738 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2739
2740 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2741 {
2742 struct net *net = seq_file_net(seq);
2743 struct ip_sf_list *psf = NULL;
2744 struct ip_mc_list *im = NULL;
2745 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2746
2747 state->idev = NULL;
2748 state->im = NULL;
2749 for_each_netdev_rcu(net, state->dev) {
2750 struct in_device *idev;
2751 idev = __in_dev_get_rcu(state->dev);
2752 if (unlikely(!idev))
2753 continue;
2754 im = rcu_dereference(idev->mc_list);
2755 if (likely(im)) {
2756 spin_lock_bh(&im->lock);
2757 psf = im->sources;
2758 if (likely(psf)) {
2759 state->im = im;
2760 state->idev = idev;
2761 break;
2762 }
2763 spin_unlock_bh(&im->lock);
2764 }
2765 }
2766 return psf;
2767 }
2768
2769 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2770 {
2771 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2772
2773 psf = psf->sf_next;
2774 while (!psf) {
2775 spin_unlock_bh(&state->im->lock);
2776 state->im = state->im->next;
2777 while (!state->im) {
2778 state->dev = next_net_device_rcu(state->dev);
2779 if (!state->dev) {
2780 state->idev = NULL;
2781 goto out;
2782 }
2783 state->idev = __in_dev_get_rcu(state->dev);
2784 if (!state->idev)
2785 continue;
2786 state->im = rcu_dereference(state->idev->mc_list);
2787 }
2788 if (!state->im)
2789 break;
2790 spin_lock_bh(&state->im->lock);
2791 psf = state->im->sources;
2792 }
2793 out:
2794 return psf;
2795 }
2796
2797 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2798 {
2799 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2800 if (psf)
2801 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2802 --pos;
2803 return pos ? NULL : psf;
2804 }
2805
2806 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2807 __acquires(rcu)
2808 {
2809 rcu_read_lock();
2810 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2811 }
2812
2813 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2814 {
2815 struct ip_sf_list *psf;
2816 if (v == SEQ_START_TOKEN)
2817 psf = igmp_mcf_get_first(seq);
2818 else
2819 psf = igmp_mcf_get_next(seq, v);
2820 ++*pos;
2821 return psf;
2822 }
2823
2824 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2825 __releases(rcu)
2826 {
2827 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2828 if (likely(state->im)) {
2829 spin_unlock_bh(&state->im->lock);
2830 state->im = NULL;
2831 }
2832 state->idev = NULL;
2833 state->dev = NULL;
2834 rcu_read_unlock();
2835 }
2836
2837 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2838 {
2839 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2840 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2841
2842 if (v == SEQ_START_TOKEN) {
2843 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2844 } else {
2845 seq_printf(seq,
2846 "%3d %6.6s 0x%08x "
2847 "0x%08x %6lu %6lu\n",
2848 state->dev->ifindex, state->dev->name,
2849 ntohl(state->im->multiaddr),
2850 ntohl(psf->sf_inaddr),
2851 psf->sf_count[MCAST_INCLUDE],
2852 psf->sf_count[MCAST_EXCLUDE]);
2853 }
2854 return 0;
2855 }
2856
2857 static const struct seq_operations igmp_mcf_seq_ops = {
2858 .start = igmp_mcf_seq_start,
2859 .next = igmp_mcf_seq_next,
2860 .stop = igmp_mcf_seq_stop,
2861 .show = igmp_mcf_seq_show,
2862 };
2863
2864 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2865 {
2866 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2867 sizeof(struct igmp_mcf_iter_state));
2868 }
2869
2870 static const struct file_operations igmp_mcf_seq_fops = {
2871 .owner = THIS_MODULE,
2872 .open = igmp_mcf_seq_open,
2873 .read = seq_read,
2874 .llseek = seq_lseek,
2875 .release = seq_release_net,
2876 };
2877
2878 static int __net_init igmp_net_init(struct net *net)
2879 {
2880 struct proc_dir_entry *pde;
2881 int err;
2882
2883 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2884 if (!pde)
2885 goto out_igmp;
2886 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2887 &igmp_mcf_seq_fops);
2888 if (!pde)
2889 goto out_mcfilter;
2890 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2891 SOCK_DGRAM, 0, net);
2892 if (err < 0) {
2893 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2894 err);
2895 goto out_sock;
2896 }
2897
2898 return 0;
2899
2900 out_sock:
2901 remove_proc_entry("mcfilter", net->proc_net);
2902 out_mcfilter:
2903 remove_proc_entry("igmp", net->proc_net);
2904 out_igmp:
2905 return -ENOMEM;
2906 }
2907
2908 static void __net_exit igmp_net_exit(struct net *net)
2909 {
2910 remove_proc_entry("mcfilter", net->proc_net);
2911 remove_proc_entry("igmp", net->proc_net);
2912 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2913 }
2914
2915 static struct pernet_operations igmp_net_ops = {
2916 .init = igmp_net_init,
2917 .exit = igmp_net_exit,
2918 };
2919 #endif
2920
2921 static int igmp_netdev_event(struct notifier_block *this,
2922 unsigned long event, void *ptr)
2923 {
2924 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2925 struct in_device *in_dev;
2926
2927 switch (event) {
2928 case NETDEV_RESEND_IGMP:
2929 in_dev = __in_dev_get_rtnl(dev);
2930 if (in_dev)
2931 ip_mc_rejoin_groups(in_dev);
2932 break;
2933 default:
2934 break;
2935 }
2936 return NOTIFY_DONE;
2937 }
2938
2939 static struct notifier_block igmp_notifier = {
2940 .notifier_call = igmp_netdev_event,
2941 };
2942
2943 int __init igmp_mc_init(void)
2944 {
2945 #if defined(CONFIG_PROC_FS)
2946 int err;
2947
2948 err = register_pernet_subsys(&igmp_net_ops);
2949 if (err)
2950 return err;
2951 err = register_netdevice_notifier(&igmp_notifier);
2952 if (err)
2953 goto reg_notif_fail;
2954 return 0;
2955
2956 reg_notif_fail:
2957 unregister_pernet_subsys(&igmp_net_ops);
2958 return err;
2959 #else
2960 return register_netdevice_notifier(&igmp_notifier);
2961 #endif
2962 }
Linux kernel - Deliverables
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