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perf bpf: Move perf_event_output() from stdio.h to bpf.h
[linux/fpc-iii.git] / net / ipv4 / igmp.c
blob765b2b32c4a4263640563f34b4dd93b5bdf471de
1 /*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
4 * This code implements the IGMP protocol as defined in RFC1112. There has
5 * been a further revision of this protocol since which is now supported.
6 *
7 * If you have trouble with this module be careful what gcc you have used,
8 * the older version didn't come out right using gcc 2.5.8, the newer one
9 * seems to fall out with gcc 2.6.2.
10 *
11 * Authors:
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
13 *
14 * This program is free software; you can redistribute it and/or
15 * modify it under the terms of the GNU General Public License
16 * as published by the Free Software Foundation; either version
17 * 2 of the License, or (at your option) any later version.
18 *
19 * Fixes:
20 *
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
23 * functions.
24 * Alan Cox : Dumped the header building experiment.
25 * Alan Cox : Minor tweaks ready for multicast routing
26 * and extended IGMP protocol.
27 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
28 * writes utterly bogus code otherwise (sigh)
29 * fixed IGMP loopback to behave in the manner
30 * desired by mrouted, fixed the fact it has been
31 * broken since 1.3.6 and cleaned up a few minor
32 * points.
33 *
34 * Chih-Jen Chang : Tried to revise IGMP to Version 2
35 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
36 * The enhancements are mainly based on Steve Deering's
37 * ipmulti-3.5 source code.
38 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
39 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
40 * the mrouted version on that device.
41 * Chih-Jen Chang : Added the max_resp_time parameter to
42 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
43 * to identify the multicast router version
44 * and do what the IGMP version 2 specified.
45 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
46 * Tsu-Sheng Tsao if the specified time expired.
47 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
48 * Alan Cox : Use GFP_ATOMIC in the right places.
49 * Christian Daudt : igmp timer wasn't set for local group
50 * memberships but was being deleted,
51 * which caused a "del_timer() called
52 * from %p with timer not initialized\n"
53 * message (960131).
54 * Christian Daudt : removed del_timer from
55 * igmp_timer_expire function (960205).
56 * Christian Daudt : igmp_heard_report now only calls
57 * igmp_timer_expire if tm->running is
58 * true (960216).
59 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
60 * igmp_heard_query never trigger. Expiry
61 * miscalculation fixed in igmp_heard_query
62 * and random() made to return unsigned to
63 * prevent negative expiry times.
64 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
65 * fix from pending 2.1.x patches.
66 * Alan Cox: Forget to enable FDDI support earlier.
67 * Alexey Kuznetsov: Fixed leaving groups on device down.
68 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
69 * David L Stevens: IGMPv3 support, with help from
70 * Vinay Kulkarni
71 */
72
73 #include <linux/module.h>
74 #include <linux/slab.h>
75 #include <linux/uaccess.h>
76 #include <linux/types.h>
77 #include <linux/kernel.h>
78 #include <linux/jiffies.h>
79 #include <linux/string.h>
80 #include <linux/socket.h>
81 #include <linux/sockios.h>
82 #include <linux/in.h>
83 #include <linux/inet.h>
84 #include <linux/netdevice.h>
85 #include <linux/skbuff.h>
86 #include <linux/inetdevice.h>
87 #include <linux/igmp.h>
88 #include <linux/if_arp.h>
89 #include <linux/rtnetlink.h>
90 #include <linux/times.h>
91 #include <linux/pkt_sched.h>
92 #include <linux/byteorder/generic.h>
93
94 #include <net/net_namespace.h>
95 #include <net/arp.h>
96 #include <net/ip.h>
97 #include <net/protocol.h>
98 #include <net/route.h>
99 #include <net/sock.h>
100 #include <net/checksum.h>
101 #include <net/inet_common.h>
102 #include <linux/netfilter_ipv4.h>
103 #ifdef CONFIG_IP_MROUTE
104 #include <linux/mroute.h>
105 #endif
106 #ifdef CONFIG_PROC_FS
107 #include <linux/proc_fs.h>
108 #include <linux/seq_file.h>
109 #endif
110
111 #ifdef CONFIG_IP_MULTICAST
112 /* Parameter names and values are taken from igmp-v2-06 draft */
113
114 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
115 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
116 #define IGMP_QUERY_INTERVAL (125*HZ)
117 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
118
119 #define IGMP_INITIAL_REPORT_DELAY (1)
120
121 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
122 * IGMP specs require to report membership immediately after
123 * joining a group, but we delay the first report by a
124 * small interval. It seems more natural and still does not
125 * contradict to specs provided this delay is small enough.
126 */
127
128 #define IGMP_V1_SEEN(in_dev) \
129 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
130 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
131 ((in_dev)->mr_v1_seen && \
132 time_before(jiffies, (in_dev)->mr_v1_seen)))
133 #define IGMP_V2_SEEN(in_dev) \
134 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
135 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
136 ((in_dev)->mr_v2_seen && \
137 time_before(jiffies, (in_dev)->mr_v2_seen)))
138
139 static int unsolicited_report_interval(struct in_device *in_dev)
140 {
141 int interval_ms, interval_jiffies;
142
143 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
144 interval_ms = IN_DEV_CONF_GET(
145 in_dev,
146 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
147 else /* v3 */
148 interval_ms = IN_DEV_CONF_GET(
149 in_dev,
150 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
151
152 interval_jiffies = msecs_to_jiffies(interval_ms);
153
154 /* _timer functions can't handle a delay of 0 jiffies so ensure
155 * we always return a positive value.
156 */
157 if (interval_jiffies <= 0)
158 interval_jiffies = 1;
159 return interval_jiffies;
160 }
161
162 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
163 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
164 static void igmpv3_clear_delrec(struct in_device *in_dev);
165 static int sf_setstate(struct ip_mc_list *pmc);
166 static void sf_markstate(struct ip_mc_list *pmc);
167 #endif
168 static void ip_mc_clear_src(struct ip_mc_list *pmc);
169 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
170 int sfcount, __be32 *psfsrc, int delta);
171
172 static void ip_ma_put(struct ip_mc_list *im)
173 {
174 if (refcount_dec_and_test(&im->refcnt)) {
175 in_dev_put(im->interface);
176 kfree_rcu(im, rcu);
177 }
178 }
179
180 #define for_each_pmc_rcu(in_dev, pmc) \
181 for (pmc = rcu_dereference(in_dev->mc_list); \
182 pmc != NULL; \
183 pmc = rcu_dereference(pmc->next_rcu))
184
185 #define for_each_pmc_rtnl(in_dev, pmc) \
186 for (pmc = rtnl_dereference(in_dev->mc_list); \
187 pmc != NULL; \
188 pmc = rtnl_dereference(pmc->next_rcu))
189
190 #ifdef CONFIG_IP_MULTICAST
191
192 /*
193 * Timer management
194 */
195
196 static void igmp_stop_timer(struct ip_mc_list *im)
197 {
198 spin_lock_bh(&im->lock);
199 if (del_timer(&im->timer))
200 refcount_dec(&im->refcnt);
201 im->tm_running = 0;
202 im->reporter = 0;
203 im->unsolicit_count = 0;
204 spin_unlock_bh(&im->lock);
205 }
206
207 /* It must be called with locked im->lock */
208 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
209 {
210 int tv = prandom_u32() % max_delay;
211
212 im->tm_running = 1;
213 if (!mod_timer(&im->timer, jiffies+tv+2))
214 refcount_inc(&im->refcnt);
215 }
216
217 static void igmp_gq_start_timer(struct in_device *in_dev)
218 {
219 int tv = prandom_u32() % in_dev->mr_maxdelay;
220 unsigned long exp = jiffies + tv + 2;
221
222 if (in_dev->mr_gq_running &&
223 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
224 return;
225
226 in_dev->mr_gq_running = 1;
227 if (!mod_timer(&in_dev->mr_gq_timer, exp))
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 refcount_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 /* source address selection per RFC 3376 section 4.2.13 */
323 static __be32 igmpv3_get_srcaddr(struct net_device *dev,
324 const struct flowi4 *fl4)
325 {
326 struct in_device *in_dev = __in_dev_get_rcu(dev);
327
328 if (!in_dev)
329 return htonl(INADDR_ANY);
330
331 for_ifa(in_dev) {
332 if (fl4->saddr == ifa->ifa_local)
333 return fl4->saddr;
334 } endfor_ifa(in_dev);
335
336 return htonl(INADDR_ANY);
337 }
338
339 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
340 {
341 struct sk_buff *skb;
342 struct rtable *rt;
343 struct iphdr *pip;
344 struct igmpv3_report *pig;
345 struct net *net = dev_net(dev);
346 struct flowi4 fl4;
347 int hlen = LL_RESERVED_SPACE(dev);
348 int tlen = dev->needed_tailroom;
349 unsigned int size = mtu;
350
351 while (1) {
352 skb = alloc_skb(size + hlen + tlen,
353 GFP_ATOMIC | __GFP_NOWARN);
354 if (skb)
355 break;
356 size >>= 1;
357 if (size < 256)
358 return NULL;
359 }
360 skb->priority = TC_PRIO_CONTROL;
361
362 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
363 0, 0,
364 IPPROTO_IGMP, 0, dev->ifindex);
365 if (IS_ERR(rt)) {
366 kfree_skb(skb);
367 return NULL;
368 }
369
370 skb_dst_set(skb, &rt->dst);
371 skb->dev = dev;
372
373 skb_reserve(skb, hlen);
374 skb_tailroom_reserve(skb, mtu, tlen);
375
376 skb_reset_network_header(skb);
377 pip = ip_hdr(skb);
378 skb_put(skb, sizeof(struct iphdr) + 4);
379
380 pip->version = 4;
381 pip->ihl = (sizeof(struct iphdr)+4)>>2;
382 pip->tos = 0xc0;
383 pip->frag_off = htons(IP_DF);
384 pip->ttl = 1;
385 pip->daddr = fl4.daddr;
386
387 rcu_read_lock();
388 pip->saddr = igmpv3_get_srcaddr(dev, &fl4);
389 rcu_read_unlock();
390
391 pip->protocol = IPPROTO_IGMP;
392 pip->tot_len = 0; /* filled in later */
393 ip_select_ident(net, skb, NULL);
394 ((u8 *)&pip[1])[0] = IPOPT_RA;
395 ((u8 *)&pip[1])[1] = 4;
396 ((u8 *)&pip[1])[2] = 0;
397 ((u8 *)&pip[1])[3] = 0;
398
399 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
400 skb_put(skb, sizeof(*pig));
401 pig = igmpv3_report_hdr(skb);
402 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
403 pig->resv1 = 0;
404 pig->csum = 0;
405 pig->resv2 = 0;
406 pig->ngrec = 0;
407 return skb;
408 }
409
410 static int igmpv3_sendpack(struct sk_buff *skb)
411 {
412 struct igmphdr *pig = igmp_hdr(skb);
413 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
414
415 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
416
417 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
418 }
419
420 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
421 {
422 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
423 }
424
425 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
426 int type, struct igmpv3_grec **ppgr, unsigned int mtu)
427 {
428 struct net_device *dev = pmc->interface->dev;
429 struct igmpv3_report *pih;
430 struct igmpv3_grec *pgr;
431
432 if (!skb) {
433 skb = igmpv3_newpack(dev, mtu);
434 if (!skb)
435 return NULL;
436 }
437 pgr = skb_put(skb, sizeof(struct igmpv3_grec));
438 pgr->grec_type = type;
439 pgr->grec_auxwords = 0;
440 pgr->grec_nsrcs = 0;
441 pgr->grec_mca = pmc->multiaddr;
442 pih = igmpv3_report_hdr(skb);
443 pih->ngrec = htons(ntohs(pih->ngrec)+1);
444 *ppgr = pgr;
445 return skb;
446 }
447
448 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
449
450 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
451 int type, int gdeleted, int sdeleted)
452 {
453 struct net_device *dev = pmc->interface->dev;
454 struct net *net = dev_net(dev);
455 struct igmpv3_report *pih;
456 struct igmpv3_grec *pgr = NULL;
457 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
458 int scount, stotal, first, isquery, truncate;
459 unsigned int mtu;
460
461 if (pmc->multiaddr == IGMP_ALL_HOSTS)
462 return skb;
463 if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
464 return skb;
465
466 mtu = READ_ONCE(dev->mtu);
467 if (mtu < IPV4_MIN_MTU)
468 return skb;
469
470 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
471 type == IGMPV3_MODE_IS_EXCLUDE;
472 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
473 type == IGMPV3_CHANGE_TO_EXCLUDE;
474
475 stotal = scount = 0;
476
477 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
478
479 if (!*psf_list)
480 goto empty_source;
481
482 pih = skb ? igmpv3_report_hdr(skb) : NULL;
483
484 /* EX and TO_EX get a fresh packet, if needed */
485 if (truncate) {
486 if (pih && pih->ngrec &&
487 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
488 if (skb)
489 igmpv3_sendpack(skb);
490 skb = igmpv3_newpack(dev, mtu);
491 }
492 }
493 first = 1;
494 psf_prev = NULL;
495 for (psf = *psf_list; psf; psf = psf_next) {
496 __be32 *psrc;
497
498 psf_next = psf->sf_next;
499
500 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
501 psf_prev = psf;
502 continue;
503 }
504
505 /* Based on RFC3376 5.1. Should not send source-list change
506 * records when there is a filter mode change.
507 */
508 if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) ||
509 (!gdeleted && pmc->crcount)) &&
510 (type == IGMPV3_ALLOW_NEW_SOURCES ||
511 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount)
512 goto decrease_sf_crcount;
513
514 /* clear marks on query responses */
515 if (isquery)
516 psf->sf_gsresp = 0;
517
518 if (AVAILABLE(skb) < sizeof(__be32) +
519 first*sizeof(struct igmpv3_grec)) {
520 if (truncate && !first)
521 break; /* truncate these */
522 if (pgr)
523 pgr->grec_nsrcs = htons(scount);
524 if (skb)
525 igmpv3_sendpack(skb);
526 skb = igmpv3_newpack(dev, mtu);
527 first = 1;
528 scount = 0;
529 }
530 if (first) {
531 skb = add_grhead(skb, pmc, type, &pgr, mtu);
532 first = 0;
533 }
534 if (!skb)
535 return NULL;
536 psrc = skb_put(skb, sizeof(__be32));
537 *psrc = psf->sf_inaddr;
538 scount++; stotal++;
539 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
540 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
541 decrease_sf_crcount:
542 psf->sf_crcount--;
543 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
544 if (psf_prev)
545 psf_prev->sf_next = psf->sf_next;
546 else
547 *psf_list = psf->sf_next;
548 kfree(psf);
549 continue;
550 }
551 }
552 psf_prev = psf;
553 }
554
555 empty_source:
556 if (!stotal) {
557 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
558 type == IGMPV3_BLOCK_OLD_SOURCES)
559 return skb;
560 if (pmc->crcount || isquery) {
561 /* make sure we have room for group header */
562 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
563 igmpv3_sendpack(skb);
564 skb = NULL; /* add_grhead will get a new one */
565 }
566 skb = add_grhead(skb, pmc, type, &pgr, mtu);
567 }
568 }
569 if (pgr)
570 pgr->grec_nsrcs = htons(scount);
571
572 if (isquery)
573 pmc->gsquery = 0; /* clear query state on report */
574 return skb;
575 }
576
577 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
578 {
579 struct sk_buff *skb = NULL;
580 struct net *net = dev_net(in_dev->dev);
581 int type;
582
583 if (!pmc) {
584 rcu_read_lock();
585 for_each_pmc_rcu(in_dev, pmc) {
586 if (pmc->multiaddr == IGMP_ALL_HOSTS)
587 continue;
588 if (ipv4_is_local_multicast(pmc->multiaddr) &&
589 !net->ipv4.sysctl_igmp_llm_reports)
590 continue;
591 spin_lock_bh(&pmc->lock);
592 if (pmc->sfcount[MCAST_EXCLUDE])
593 type = IGMPV3_MODE_IS_EXCLUDE;
594 else
595 type = IGMPV3_MODE_IS_INCLUDE;
596 skb = add_grec(skb, pmc, type, 0, 0);
597 spin_unlock_bh(&pmc->lock);
598 }
599 rcu_read_unlock();
600 } else {
601 spin_lock_bh(&pmc->lock);
602 if (pmc->sfcount[MCAST_EXCLUDE])
603 type = IGMPV3_MODE_IS_EXCLUDE;
604 else
605 type = IGMPV3_MODE_IS_INCLUDE;
606 skb = add_grec(skb, pmc, type, 0, 0);
607 spin_unlock_bh(&pmc->lock);
608 }
609 if (!skb)
610 return 0;
611 return igmpv3_sendpack(skb);
612 }
613
614 /*
615 * remove zero-count source records from a source filter list
616 */
617 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
618 {
619 struct ip_sf_list *psf_prev, *psf_next, *psf;
620
621 psf_prev = NULL;
622 for (psf = *ppsf; psf; psf = psf_next) {
623 psf_next = psf->sf_next;
624 if (psf->sf_crcount == 0) {
625 if (psf_prev)
626 psf_prev->sf_next = psf->sf_next;
627 else
628 *ppsf = psf->sf_next;
629 kfree(psf);
630 } else
631 psf_prev = psf;
632 }
633 }
634
635 static void igmpv3_send_cr(struct in_device *in_dev)
636 {
637 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
638 struct sk_buff *skb = NULL;
639 int type, dtype;
640
641 rcu_read_lock();
642 spin_lock_bh(&in_dev->mc_tomb_lock);
643
644 /* deleted MCA's */
645 pmc_prev = NULL;
646 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
647 pmc_next = pmc->next;
648 if (pmc->sfmode == MCAST_INCLUDE) {
649 type = IGMPV3_BLOCK_OLD_SOURCES;
650 dtype = IGMPV3_BLOCK_OLD_SOURCES;
651 skb = add_grec(skb, pmc, type, 1, 0);
652 skb = add_grec(skb, pmc, dtype, 1, 1);
653 }
654 if (pmc->crcount) {
655 if (pmc->sfmode == MCAST_EXCLUDE) {
656 type = IGMPV3_CHANGE_TO_INCLUDE;
657 skb = add_grec(skb, pmc, type, 1, 0);
658 }
659 pmc->crcount--;
660 if (pmc->crcount == 0) {
661 igmpv3_clear_zeros(&pmc->tomb);
662 igmpv3_clear_zeros(&pmc->sources);
663 }
664 }
665 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
666 if (pmc_prev)
667 pmc_prev->next = pmc_next;
668 else
669 in_dev->mc_tomb = pmc_next;
670 in_dev_put(pmc->interface);
671 kfree(pmc);
672 } else
673 pmc_prev = pmc;
674 }
675 spin_unlock_bh(&in_dev->mc_tomb_lock);
676
677 /* change recs */
678 for_each_pmc_rcu(in_dev, pmc) {
679 spin_lock_bh(&pmc->lock);
680 if (pmc->sfcount[MCAST_EXCLUDE]) {
681 type = IGMPV3_BLOCK_OLD_SOURCES;
682 dtype = IGMPV3_ALLOW_NEW_SOURCES;
683 } else {
684 type = IGMPV3_ALLOW_NEW_SOURCES;
685 dtype = IGMPV3_BLOCK_OLD_SOURCES;
686 }
687 skb = add_grec(skb, pmc, type, 0, 0);
688 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
689
690 /* filter mode changes */
691 if (pmc->crcount) {
692 if (pmc->sfmode == MCAST_EXCLUDE)
693 type = IGMPV3_CHANGE_TO_EXCLUDE;
694 else
695 type = IGMPV3_CHANGE_TO_INCLUDE;
696 skb = add_grec(skb, pmc, type, 0, 0);
697 pmc->crcount--;
698 }
699 spin_unlock_bh(&pmc->lock);
700 }
701 rcu_read_unlock();
702
703 if (!skb)
704 return;
705 (void) igmpv3_sendpack(skb);
706 }
707
708 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
709 int type)
710 {
711 struct sk_buff *skb;
712 struct iphdr *iph;
713 struct igmphdr *ih;
714 struct rtable *rt;
715 struct net_device *dev = in_dev->dev;
716 struct net *net = dev_net(dev);
717 __be32 group = pmc ? pmc->multiaddr : 0;
718 struct flowi4 fl4;
719 __be32 dst;
720 int hlen, tlen;
721
722 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
723 return igmpv3_send_report(in_dev, pmc);
724
725 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
726 return 0;
727
728 if (type == IGMP_HOST_LEAVE_MESSAGE)
729 dst = IGMP_ALL_ROUTER;
730 else
731 dst = group;
732
733 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
734 0, 0,
735 IPPROTO_IGMP, 0, dev->ifindex);
736 if (IS_ERR(rt))
737 return -1;
738
739 hlen = LL_RESERVED_SPACE(dev);
740 tlen = dev->needed_tailroom;
741 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
742 if (!skb) {
743 ip_rt_put(rt);
744 return -1;
745 }
746 skb->priority = TC_PRIO_CONTROL;
747
748 skb_dst_set(skb, &rt->dst);
749
750 skb_reserve(skb, hlen);
751
752 skb_reset_network_header(skb);
753 iph = ip_hdr(skb);
754 skb_put(skb, sizeof(struct iphdr) + 4);
755
756 iph->version = 4;
757 iph->ihl = (sizeof(struct iphdr)+4)>>2;
758 iph->tos = 0xc0;
759 iph->frag_off = htons(IP_DF);
760 iph->ttl = 1;
761 iph->daddr = dst;
762 iph->saddr = fl4.saddr;
763 iph->protocol = IPPROTO_IGMP;
764 ip_select_ident(net, skb, NULL);
765 ((u8 *)&iph[1])[0] = IPOPT_RA;
766 ((u8 *)&iph[1])[1] = 4;
767 ((u8 *)&iph[1])[2] = 0;
768 ((u8 *)&iph[1])[3] = 0;
769
770 ih = skb_put(skb, sizeof(struct igmphdr));
771 ih->type = type;
772 ih->code = 0;
773 ih->csum = 0;
774 ih->group = group;
775 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
776
777 return ip_local_out(net, skb->sk, skb);
778 }
779
780 static void igmp_gq_timer_expire(struct timer_list *t)
781 {
782 struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer);
783
784 in_dev->mr_gq_running = 0;
785 igmpv3_send_report(in_dev, NULL);
786 in_dev_put(in_dev);
787 }
788
789 static void igmp_ifc_timer_expire(struct timer_list *t)
790 {
791 struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer);
792
793 igmpv3_send_cr(in_dev);
794 if (in_dev->mr_ifc_count) {
795 in_dev->mr_ifc_count--;
796 igmp_ifc_start_timer(in_dev,
797 unsolicited_report_interval(in_dev));
798 }
799 in_dev_put(in_dev);
800 }
801
802 static void igmp_ifc_event(struct in_device *in_dev)
803 {
804 struct net *net = dev_net(in_dev->dev);
805 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
806 return;
807 in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
808 igmp_ifc_start_timer(in_dev, 1);
809 }
810
811
812 static void igmp_timer_expire(struct timer_list *t)
813 {
814 struct ip_mc_list *im = from_timer(im, t, timer);
815 struct in_device *in_dev = im->interface;
816
817 spin_lock(&im->lock);
818 im->tm_running = 0;
819
820 if (im->unsolicit_count && --im->unsolicit_count)
821 igmp_start_timer(im, unsolicited_report_interval(in_dev));
822
823 im->reporter = 1;
824 spin_unlock(&im->lock);
825
826 if (IGMP_V1_SEEN(in_dev))
827 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
828 else if (IGMP_V2_SEEN(in_dev))
829 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
830 else
831 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
832
833 ip_ma_put(im);
834 }
835
836 /* mark EXCLUDE-mode sources */
837 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
838 {
839 struct ip_sf_list *psf;
840 int i, scount;
841
842 scount = 0;
843 for (psf = pmc->sources; psf; psf = psf->sf_next) {
844 if (scount == nsrcs)
845 break;
846 for (i = 0; i < nsrcs; i++) {
847 /* skip inactive filters */
848 if (psf->sf_count[MCAST_INCLUDE] ||
849 pmc->sfcount[MCAST_EXCLUDE] !=
850 psf->sf_count[MCAST_EXCLUDE])
851 break;
852 if (srcs[i] == psf->sf_inaddr) {
853 scount++;
854 break;
855 }
856 }
857 }
858 pmc->gsquery = 0;
859 if (scount == nsrcs) /* all sources excluded */
860 return 0;
861 return 1;
862 }
863
864 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
865 {
866 struct ip_sf_list *psf;
867 int i, scount;
868
869 if (pmc->sfmode == MCAST_EXCLUDE)
870 return igmp_xmarksources(pmc, nsrcs, srcs);
871
872 /* mark INCLUDE-mode sources */
873 scount = 0;
874 for (psf = pmc->sources; psf; psf = psf->sf_next) {
875 if (scount == nsrcs)
876 break;
877 for (i = 0; i < nsrcs; i++)
878 if (srcs[i] == psf->sf_inaddr) {
879 psf->sf_gsresp = 1;
880 scount++;
881 break;
882 }
883 }
884 if (!scount) {
885 pmc->gsquery = 0;
886 return 0;
887 }
888 pmc->gsquery = 1;
889 return 1;
890 }
891
892 /* return true if packet was dropped */
893 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
894 {
895 struct ip_mc_list *im;
896 struct net *net = dev_net(in_dev->dev);
897
898 /* Timers are only set for non-local groups */
899
900 if (group == IGMP_ALL_HOSTS)
901 return false;
902 if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports)
903 return false;
904
905 rcu_read_lock();
906 for_each_pmc_rcu(in_dev, im) {
907 if (im->multiaddr == group) {
908 igmp_stop_timer(im);
909 break;
910 }
911 }
912 rcu_read_unlock();
913 return false;
914 }
915
916 /* return true if packet was dropped */
917 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
918 int len)
919 {
920 struct igmphdr *ih = igmp_hdr(skb);
921 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
922 struct ip_mc_list *im;
923 __be32 group = ih->group;
924 int max_delay;
925 int mark = 0;
926 struct net *net = dev_net(in_dev->dev);
927
928
929 if (len == 8) {
930 if (ih->code == 0) {
931 /* Alas, old v1 router presents here. */
932
933 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
934 in_dev->mr_v1_seen = jiffies +
935 (in_dev->mr_qrv * in_dev->mr_qi) +
936 in_dev->mr_qri;
937 group = 0;
938 } else {
939 /* v2 router present */
940 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
941 in_dev->mr_v2_seen = jiffies +
942 (in_dev->mr_qrv * in_dev->mr_qi) +
943 in_dev->mr_qri;
944 }
945 /* cancel the interface change timer */
946 in_dev->mr_ifc_count = 0;
947 if (del_timer(&in_dev->mr_ifc_timer))
948 __in_dev_put(in_dev);
949 /* clear deleted report items */
950 igmpv3_clear_delrec(in_dev);
951 } else if (len < 12) {
952 return true; /* ignore bogus packet; freed by caller */
953 } else if (IGMP_V1_SEEN(in_dev)) {
954 /* This is a v3 query with v1 queriers present */
955 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
956 group = 0;
957 } else if (IGMP_V2_SEEN(in_dev)) {
958 /* this is a v3 query with v2 queriers present;
959 * Interpretation of the max_delay code is problematic here.
960 * A real v2 host would use ih_code directly, while v3 has a
961 * different encoding. We use the v3 encoding as more likely
962 * to be intended in a v3 query.
963 */
964 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
965 if (!max_delay)
966 max_delay = 1; /* can't mod w/ 0 */
967 } else { /* v3 */
968 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
969 return true;
970
971 ih3 = igmpv3_query_hdr(skb);
972 if (ih3->nsrcs) {
973 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
974 + ntohs(ih3->nsrcs)*sizeof(__be32)))
975 return true;
976 ih3 = igmpv3_query_hdr(skb);
977 }
978
979 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
980 if (!max_delay)
981 max_delay = 1; /* can't mod w/ 0 */
982 in_dev->mr_maxdelay = max_delay;
983
984 /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently
985 * received value was zero, use the default or statically
986 * configured value.
987 */
988 in_dev->mr_qrv = ih3->qrv ?: net->ipv4.sysctl_igmp_qrv;
989 in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL;
990
991 /* RFC3376, 8.3. Query Response Interval:
992 * The number of seconds represented by the [Query Response
993 * Interval] must be less than the [Query Interval].
994 */
995 if (in_dev->mr_qri >= in_dev->mr_qi)
996 in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ;
997
998 if (!group) { /* general query */
999 if (ih3->nsrcs)
1000 return true; /* no sources allowed */
1001 igmp_gq_start_timer(in_dev);
1002 return false;
1003 }
1004 /* mark sources to include, if group & source-specific */
1005 mark = ih3->nsrcs != 0;
1006 }
1007
1008 /*
1009 * - Start the timers in all of our membership records
1010 * that the query applies to for the interface on
1011 * which the query arrived excl. those that belong
1012 * to a "local" group (224.0.0.X)
1013 * - For timers already running check if they need to
1014 * be reset.
1015 * - Use the igmp->igmp_code field as the maximum
1016 * delay possible
1017 */
1018 rcu_read_lock();
1019 for_each_pmc_rcu(in_dev, im) {
1020 int changed;
1021
1022 if (group && group != im->multiaddr)
1023 continue;
1024 if (im->multiaddr == IGMP_ALL_HOSTS)
1025 continue;
1026 if (ipv4_is_local_multicast(im->multiaddr) &&
1027 !net->ipv4.sysctl_igmp_llm_reports)
1028 continue;
1029 spin_lock_bh(&im->lock);
1030 if (im->tm_running)
1031 im->gsquery = im->gsquery && mark;
1032 else
1033 im->gsquery = mark;
1034 changed = !im->gsquery ||
1035 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
1036 spin_unlock_bh(&im->lock);
1037 if (changed)
1038 igmp_mod_timer(im, max_delay);
1039 }
1040 rcu_read_unlock();
1041 return false;
1042 }
1043
1044 /* called in rcu_read_lock() section */
1045 int igmp_rcv(struct sk_buff *skb)
1046 {
1047 /* This basically follows the spec line by line -- see RFC1112 */
1048 struct igmphdr *ih;
1049 struct net_device *dev = skb->dev;
1050 struct in_device *in_dev;
1051 int len = skb->len;
1052 bool dropped = true;
1053
1054 if (netif_is_l3_master(dev)) {
1055 dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif);
1056 if (!dev)
1057 goto drop;
1058 }
1059
1060 in_dev = __in_dev_get_rcu(dev);
1061 if (!in_dev)
1062 goto drop;
1063
1064 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1065 goto drop;
1066
1067 if (skb_checksum_simple_validate(skb))
1068 goto drop;
1069
1070 ih = igmp_hdr(skb);
1071 switch (ih->type) {
1072 case IGMP_HOST_MEMBERSHIP_QUERY:
1073 dropped = igmp_heard_query(in_dev, skb, len);
1074 break;
1075 case IGMP_HOST_MEMBERSHIP_REPORT:
1076 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1077 /* Is it our report looped back? */
1078 if (rt_is_output_route(skb_rtable(skb)))
1079 break;
1080 /* don't rely on MC router hearing unicast reports */
1081 if (skb->pkt_type == PACKET_MULTICAST ||
1082 skb->pkt_type == PACKET_BROADCAST)
1083 dropped = igmp_heard_report(in_dev, ih->group);
1084 break;
1085 case IGMP_PIM:
1086 #ifdef CONFIG_IP_PIMSM_V1
1087 return pim_rcv_v1(skb);
1088 #endif
1089 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1090 case IGMP_DVMRP:
1091 case IGMP_TRACE:
1092 case IGMP_HOST_LEAVE_MESSAGE:
1093 case IGMP_MTRACE:
1094 case IGMP_MTRACE_RESP:
1095 break;
1096 default:
1097 break;
1098 }
1099
1100 drop:
1101 if (dropped)
1102 kfree_skb(skb);
1103 else
1104 consume_skb(skb);
1105 return 0;
1106 }
1107
1108 #endif
1109
1110
1111 /*
1112 * Add a filter to a device
1113 */
1114
1115 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1116 {
1117 char buf[MAX_ADDR_LEN];
1118 struct net_device *dev = in_dev->dev;
1119
1120 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1121 We will get multicast token leakage, when IFF_MULTICAST
1122 is changed. This check should be done in ndo_set_rx_mode
1123 routine. Something sort of:
1124 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1125 --ANK
1126 */
1127 if (arp_mc_map(addr, buf, dev, 0) == 0)
1128 dev_mc_add(dev, buf);
1129 }
1130
1131 /*
1132 * Remove a filter from a device
1133 */
1134
1135 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1136 {
1137 char buf[MAX_ADDR_LEN];
1138 struct net_device *dev = in_dev->dev;
1139
1140 if (arp_mc_map(addr, buf, dev, 0) == 0)
1141 dev_mc_del(dev, buf);
1142 }
1143
1144 #ifdef CONFIG_IP_MULTICAST
1145 /*
1146 * deleted ip_mc_list manipulation
1147 */
1148 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1149 {
1150 struct ip_mc_list *pmc;
1151 struct net *net = dev_net(in_dev->dev);
1152
1153 /* this is an "ip_mc_list" for convenience; only the fields below
1154 * are actually used. In particular, the refcnt and users are not
1155 * used for management of the delete list. Using the same structure
1156 * for deleted items allows change reports to use common code with
1157 * non-deleted or query-response MCA's.
1158 */
1159 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1160 if (!pmc)
1161 return;
1162 spin_lock_init(&pmc->lock);
1163 spin_lock_bh(&im->lock);
1164 pmc->interface = im->interface;
1165 in_dev_hold(in_dev);
1166 pmc->multiaddr = im->multiaddr;
1167 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1168 pmc->sfmode = im->sfmode;
1169 if (pmc->sfmode == MCAST_INCLUDE) {
1170 struct ip_sf_list *psf;
1171
1172 pmc->tomb = im->tomb;
1173 pmc->sources = im->sources;
1174 im->tomb = im->sources = NULL;
1175 for (psf = pmc->sources; psf; psf = psf->sf_next)
1176 psf->sf_crcount = pmc->crcount;
1177 }
1178 spin_unlock_bh(&im->lock);
1179
1180 spin_lock_bh(&in_dev->mc_tomb_lock);
1181 pmc->next = in_dev->mc_tomb;
1182 in_dev->mc_tomb = pmc;
1183 spin_unlock_bh(&in_dev->mc_tomb_lock);
1184 }
1185
1186 /*
1187 * restore ip_mc_list deleted records
1188 */
1189 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1190 {
1191 struct ip_mc_list *pmc, *pmc_prev;
1192 struct ip_sf_list *psf;
1193 struct net *net = dev_net(in_dev->dev);
1194 __be32 multiaddr = im->multiaddr;
1195
1196 spin_lock_bh(&in_dev->mc_tomb_lock);
1197 pmc_prev = NULL;
1198 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1199 if (pmc->multiaddr == multiaddr)
1200 break;
1201 pmc_prev = pmc;
1202 }
1203 if (pmc) {
1204 if (pmc_prev)
1205 pmc_prev->next = pmc->next;
1206 else
1207 in_dev->mc_tomb = pmc->next;
1208 }
1209 spin_unlock_bh(&in_dev->mc_tomb_lock);
1210
1211 spin_lock_bh(&im->lock);
1212 if (pmc) {
1213 im->interface = pmc->interface;
1214 if (im->sfmode == MCAST_INCLUDE) {
1215 im->tomb = pmc->tomb;
1216 im->sources = pmc->sources;
1217 for (psf = im->sources; psf; psf = psf->sf_next)
1218 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1219 } else {
1220 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1221 }
1222 in_dev_put(pmc->interface);
1223 kfree(pmc);
1224 }
1225 spin_unlock_bh(&im->lock);
1226 }
1227
1228 /*
1229 * flush ip_mc_list deleted records
1230 */
1231 static void igmpv3_clear_delrec(struct in_device *in_dev)
1232 {
1233 struct ip_mc_list *pmc, *nextpmc;
1234
1235 spin_lock_bh(&in_dev->mc_tomb_lock);
1236 pmc = in_dev->mc_tomb;
1237 in_dev->mc_tomb = NULL;
1238 spin_unlock_bh(&in_dev->mc_tomb_lock);
1239
1240 for (; pmc; pmc = nextpmc) {
1241 nextpmc = pmc->next;
1242 ip_mc_clear_src(pmc);
1243 in_dev_put(pmc->interface);
1244 kfree(pmc);
1245 }
1246 /* clear dead sources, too */
1247 rcu_read_lock();
1248 for_each_pmc_rcu(in_dev, pmc) {
1249 struct ip_sf_list *psf, *psf_next;
1250
1251 spin_lock_bh(&pmc->lock);
1252 psf = pmc->tomb;
1253 pmc->tomb = NULL;
1254 spin_unlock_bh(&pmc->lock);
1255 for (; psf; psf = psf_next) {
1256 psf_next = psf->sf_next;
1257 kfree(psf);
1258 }
1259 }
1260 rcu_read_unlock();
1261 }
1262 #endif
1263
1264 static void igmp_group_dropped(struct ip_mc_list *im)
1265 {
1266 struct in_device *in_dev = im->interface;
1267 #ifdef CONFIG_IP_MULTICAST
1268 struct net *net = dev_net(in_dev->dev);
1269 int reporter;
1270 #endif
1271
1272 if (im->loaded) {
1273 im->loaded = 0;
1274 ip_mc_filter_del(in_dev, im->multiaddr);
1275 }
1276
1277 #ifdef CONFIG_IP_MULTICAST
1278 if (im->multiaddr == IGMP_ALL_HOSTS)
1279 return;
1280 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1281 return;
1282
1283 reporter = im->reporter;
1284 igmp_stop_timer(im);
1285
1286 if (!in_dev->dead) {
1287 if (IGMP_V1_SEEN(in_dev))
1288 return;
1289 if (IGMP_V2_SEEN(in_dev)) {
1290 if (reporter)
1291 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1292 return;
1293 }
1294 /* IGMPv3 */
1295 igmpv3_add_delrec(in_dev, im);
1296
1297 igmp_ifc_event(in_dev);
1298 }
1299 #endif
1300 }
1301
1302 static void igmp_group_added(struct ip_mc_list *im)
1303 {
1304 struct in_device *in_dev = im->interface;
1305 #ifdef CONFIG_IP_MULTICAST
1306 struct net *net = dev_net(in_dev->dev);
1307 #endif
1308
1309 if (im->loaded == 0) {
1310 im->loaded = 1;
1311 ip_mc_filter_add(in_dev, im->multiaddr);
1312 }
1313
1314 #ifdef CONFIG_IP_MULTICAST
1315 if (im->multiaddr == IGMP_ALL_HOSTS)
1316 return;
1317 if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports)
1318 return;
1319
1320 if (in_dev->dead)
1321 return;
1322
1323 im->unsolicit_count = net->ipv4.sysctl_igmp_qrv;
1324 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1325 spin_lock_bh(&im->lock);
1326 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1327 spin_unlock_bh(&im->lock);
1328 return;
1329 }
1330 /* else, v3 */
1331
1332 /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should
1333 * not send filter-mode change record as the mode should be from
1334 * IN() to IN(A).
1335 */
1336 if (im->sfmode == MCAST_EXCLUDE)
1337 im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1338
1339 igmp_ifc_event(in_dev);
1340 #endif
1341 }
1342
1343
1344 /*
1345 * Multicast list managers
1346 */
1347
1348 static u32 ip_mc_hash(const struct ip_mc_list *im)
1349 {
1350 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1351 }
1352
1353 static void ip_mc_hash_add(struct in_device *in_dev,
1354 struct ip_mc_list *im)
1355 {
1356 struct ip_mc_list __rcu **mc_hash;
1357 u32 hash;
1358
1359 mc_hash = rtnl_dereference(in_dev->mc_hash);
1360 if (mc_hash) {
1361 hash = ip_mc_hash(im);
1362 im->next_hash = mc_hash[hash];
1363 rcu_assign_pointer(mc_hash[hash], im);
1364 return;
1365 }
1366
1367 /* do not use a hash table for small number of items */
1368 if (in_dev->mc_count < 4)
1369 return;
1370
1371 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1372 GFP_KERNEL);
1373 if (!mc_hash)
1374 return;
1375
1376 for_each_pmc_rtnl(in_dev, im) {
1377 hash = ip_mc_hash(im);
1378 im->next_hash = mc_hash[hash];
1379 RCU_INIT_POINTER(mc_hash[hash], im);
1380 }
1381
1382 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1383 }
1384
1385 static void ip_mc_hash_remove(struct in_device *in_dev,
1386 struct ip_mc_list *im)
1387 {
1388 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1389 struct ip_mc_list *aux;
1390
1391 if (!mc_hash)
1392 return;
1393 mc_hash += ip_mc_hash(im);
1394 while ((aux = rtnl_dereference(*mc_hash)) != im)
1395 mc_hash = &aux->next_hash;
1396 *mc_hash = im->next_hash;
1397 }
1398
1399
1400 /*
1401 * A socket has joined a multicast group on device dev.
1402 */
1403 static void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr,
1404 unsigned int mode)
1405 {
1406 struct ip_mc_list *im;
1407
1408 ASSERT_RTNL();
1409
1410 for_each_pmc_rtnl(in_dev, im) {
1411 if (im->multiaddr == addr) {
1412 im->users++;
1413 ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0);
1414 goto out;
1415 }
1416 }
1417
1418 im = kzalloc(sizeof(*im), GFP_KERNEL);
1419 if (!im)
1420 goto out;
1421
1422 im->users = 1;
1423 im->interface = in_dev;
1424 in_dev_hold(in_dev);
1425 im->multiaddr = addr;
1426 /* initial mode is (EX, empty) */
1427 im->sfmode = mode;
1428 im->sfcount[mode] = 1;
1429 refcount_set(&im->refcnt, 1);
1430 spin_lock_init(&im->lock);
1431 #ifdef CONFIG_IP_MULTICAST
1432 timer_setup(&im->timer, igmp_timer_expire, 0);
1433 #endif
1434
1435 im->next_rcu = in_dev->mc_list;
1436 in_dev->mc_count++;
1437 rcu_assign_pointer(in_dev->mc_list, im);
1438
1439 ip_mc_hash_add(in_dev, im);
1440
1441 #ifdef CONFIG_IP_MULTICAST
1442 igmpv3_del_delrec(in_dev, im);
1443 #endif
1444 igmp_group_added(im);
1445 if (!in_dev->dead)
1446 ip_rt_multicast_event(in_dev);
1447 out:
1448 return;
1449 }
1450
1451 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1452 {
1453 __ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE);
1454 }
1455 EXPORT_SYMBOL(ip_mc_inc_group);
1456
1457 static int ip_mc_check_iphdr(struct sk_buff *skb)
1458 {
1459 const struct iphdr *iph;
1460 unsigned int len;
1461 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1462
1463 if (!pskb_may_pull(skb, offset))
1464 return -EINVAL;
1465
1466 iph = ip_hdr(skb);
1467
1468 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1469 return -EINVAL;
1470
1471 offset += ip_hdrlen(skb) - sizeof(*iph);
1472
1473 if (!pskb_may_pull(skb, offset))
1474 return -EINVAL;
1475
1476 iph = ip_hdr(skb);
1477
1478 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1479 return -EINVAL;
1480
1481 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1482 if (skb->len < len || len < offset)
1483 return -EINVAL;
1484
1485 skb_set_transport_header(skb, offset);
1486
1487 return 0;
1488 }
1489
1490 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1491 {
1492 unsigned int len = skb_transport_offset(skb);
1493
1494 len += sizeof(struct igmpv3_report);
1495
1496 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1497 }
1498
1499 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1500 {
1501 unsigned int len = skb_transport_offset(skb);
1502
1503 len += sizeof(struct igmphdr);
1504 if (skb->len < len)
1505 return -EINVAL;
1506
1507 /* IGMPv{1,2}? */
1508 if (skb->len != len) {
1509 /* or IGMPv3? */
1510 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1511 if (skb->len < len || !pskb_may_pull(skb, len))
1512 return -EINVAL;
1513 }
1514
1515 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1516 * all-systems destination addresses (224.0.0.1) for general queries
1517 */
1518 if (!igmp_hdr(skb)->group &&
1519 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1520 return -EINVAL;
1521
1522 return 0;
1523 }
1524
1525 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1526 {
1527 switch (igmp_hdr(skb)->type) {
1528 case IGMP_HOST_LEAVE_MESSAGE:
1529 case IGMP_HOST_MEMBERSHIP_REPORT:
1530 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1531 /* fall through */
1532 return 0;
1533 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1534 return ip_mc_check_igmp_reportv3(skb);
1535 case IGMP_HOST_MEMBERSHIP_QUERY:
1536 return ip_mc_check_igmp_query(skb);
1537 default:
1538 return -ENOMSG;
1539 }
1540 }
1541
1542 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1543 {
1544 return skb_checksum_simple_validate(skb);
1545 }
1546
1547 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1548
1549 {
1550 struct sk_buff *skb_chk;
1551 unsigned int transport_len;
1552 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1553 int ret = -EINVAL;
1554
1555 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1556
1557 skb_chk = skb_checksum_trimmed(skb, transport_len,
1558 ip_mc_validate_checksum);
1559 if (!skb_chk)
1560 goto err;
1561
1562 if (!pskb_may_pull(skb_chk, len))
1563 goto err;
1564
1565 ret = ip_mc_check_igmp_msg(skb_chk);
1566 if (ret)
1567 goto err;
1568
1569 if (skb_trimmed)
1570 *skb_trimmed = skb_chk;
1571 /* free now unneeded clone */
1572 else if (skb_chk != skb)
1573 kfree_skb(skb_chk);
1574
1575 ret = 0;
1576
1577 err:
1578 if (ret && skb_chk && skb_chk != skb)
1579 kfree_skb(skb_chk);
1580
1581 return ret;
1582 }
1583
1584 /**
1585 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1586 * @skb: the skb to validate
1587 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1588 *
1589 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1590 * skb transport header accordingly and returns zero.
1591 *
1592 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1593 * standard
1594 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1595 * -ENOMEM: A memory allocation failure happened.
1596 *
1597 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1598 * to NULL): After parsing an IGMP packet successfully it will point to
1599 * an skb which has its tail aligned to the IP packet end. This might
1600 * either be the originally provided skb or a trimmed, cloned version if
1601 * the skb frame had data beyond the IP packet. A cloned skb allows us
1602 * to leave the original skb and its full frame unchanged (which might be
1603 * desirable for layer 2 frame jugglers).
1604 *
1605 * Caller needs to set the skb network header and free any returned skb if it
1606 * differs from the provided skb.
1607 */
1608 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1609 {
1610 int ret = ip_mc_check_iphdr(skb);
1611
1612 if (ret < 0)
1613 return ret;
1614
1615 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1616 return -ENOMSG;
1617
1618 return __ip_mc_check_igmp(skb, skb_trimmed);
1619 }
1620 EXPORT_SYMBOL(ip_mc_check_igmp);
1621
1622 /*
1623 * Resend IGMP JOIN report; used by netdev notifier.
1624 */
1625 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1626 {
1627 #ifdef CONFIG_IP_MULTICAST
1628 struct ip_mc_list *im;
1629 int type;
1630 struct net *net = dev_net(in_dev->dev);
1631
1632 ASSERT_RTNL();
1633
1634 for_each_pmc_rtnl(in_dev, im) {
1635 if (im->multiaddr == IGMP_ALL_HOSTS)
1636 continue;
1637 if (ipv4_is_local_multicast(im->multiaddr) &&
1638 !net->ipv4.sysctl_igmp_llm_reports)
1639 continue;
1640
1641 /* a failover is happening and switches
1642 * must be notified immediately
1643 */
1644 if (IGMP_V1_SEEN(in_dev))
1645 type = IGMP_HOST_MEMBERSHIP_REPORT;
1646 else if (IGMP_V2_SEEN(in_dev))
1647 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1648 else
1649 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1650 igmp_send_report(in_dev, im, type);
1651 }
1652 #endif
1653 }
1654
1655 /*
1656 * A socket has left a multicast group on device dev
1657 */
1658
1659 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1660 {
1661 struct ip_mc_list *i;
1662 struct ip_mc_list __rcu **ip;
1663
1664 ASSERT_RTNL();
1665
1666 for (ip = &in_dev->mc_list;
1667 (i = rtnl_dereference(*ip)) != NULL;
1668 ip = &i->next_rcu) {
1669 if (i->multiaddr == addr) {
1670 if (--i->users == 0) {
1671 ip_mc_hash_remove(in_dev, i);
1672 *ip = i->next_rcu;
1673 in_dev->mc_count--;
1674 igmp_group_dropped(i);
1675 ip_mc_clear_src(i);
1676
1677 if (!in_dev->dead)
1678 ip_rt_multicast_event(in_dev);
1679
1680 ip_ma_put(i);
1681 return;
1682 }
1683 break;
1684 }
1685 }
1686 }
1687 EXPORT_SYMBOL(ip_mc_dec_group);
1688
1689 /* Device changing type */
1690
1691 void ip_mc_unmap(struct in_device *in_dev)
1692 {
1693 struct ip_mc_list *pmc;
1694
1695 ASSERT_RTNL();
1696
1697 for_each_pmc_rtnl(in_dev, pmc)
1698 igmp_group_dropped(pmc);
1699 }
1700
1701 void ip_mc_remap(struct in_device *in_dev)
1702 {
1703 struct ip_mc_list *pmc;
1704
1705 ASSERT_RTNL();
1706
1707 for_each_pmc_rtnl(in_dev, pmc) {
1708 #ifdef CONFIG_IP_MULTICAST
1709 igmpv3_del_delrec(in_dev, pmc);
1710 #endif
1711 igmp_group_added(pmc);
1712 }
1713 }
1714
1715 /* Device going down */
1716
1717 void ip_mc_down(struct in_device *in_dev)
1718 {
1719 struct ip_mc_list *pmc;
1720
1721 ASSERT_RTNL();
1722
1723 for_each_pmc_rtnl(in_dev, pmc)
1724 igmp_group_dropped(pmc);
1725
1726 #ifdef CONFIG_IP_MULTICAST
1727 in_dev->mr_ifc_count = 0;
1728 if (del_timer(&in_dev->mr_ifc_timer))
1729 __in_dev_put(in_dev);
1730 in_dev->mr_gq_running = 0;
1731 if (del_timer(&in_dev->mr_gq_timer))
1732 __in_dev_put(in_dev);
1733 #endif
1734
1735 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1736 }
1737
1738 #ifdef CONFIG_IP_MULTICAST
1739 static void ip_mc_reset(struct in_device *in_dev)
1740 {
1741 struct net *net = dev_net(in_dev->dev);
1742
1743 in_dev->mr_qi = IGMP_QUERY_INTERVAL;
1744 in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL;
1745 in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv;
1746 }
1747 #else
1748 static void ip_mc_reset(struct in_device *in_dev)
1749 {
1750 }
1751 #endif
1752
1753 void ip_mc_init_dev(struct in_device *in_dev)
1754 {
1755 ASSERT_RTNL();
1756
1757 #ifdef CONFIG_IP_MULTICAST
1758 timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0);
1759 timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0);
1760 #endif
1761 ip_mc_reset(in_dev);
1762
1763 spin_lock_init(&in_dev->mc_tomb_lock);
1764 }
1765
1766 /* Device going up */
1767
1768 void ip_mc_up(struct in_device *in_dev)
1769 {
1770 struct ip_mc_list *pmc;
1771
1772 ASSERT_RTNL();
1773
1774 ip_mc_reset(in_dev);
1775 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1776
1777 for_each_pmc_rtnl(in_dev, pmc) {
1778 #ifdef CONFIG_IP_MULTICAST
1779 igmpv3_del_delrec(in_dev, pmc);
1780 #endif
1781 igmp_group_added(pmc);
1782 }
1783 }
1784
1785 /*
1786 * Device is about to be destroyed: clean up.
1787 */
1788
1789 void ip_mc_destroy_dev(struct in_device *in_dev)
1790 {
1791 struct ip_mc_list *i;
1792
1793 ASSERT_RTNL();
1794
1795 /* Deactivate timers */
1796 ip_mc_down(in_dev);
1797 #ifdef CONFIG_IP_MULTICAST
1798 igmpv3_clear_delrec(in_dev);
1799 #endif
1800
1801 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1802 in_dev->mc_list = i->next_rcu;
1803 in_dev->mc_count--;
1804 ip_ma_put(i);
1805 }
1806 }
1807
1808 /* RTNL is locked */
1809 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1810 {
1811 struct net_device *dev = NULL;
1812 struct in_device *idev = NULL;
1813
1814 if (imr->imr_ifindex) {
1815 idev = inetdev_by_index(net, imr->imr_ifindex);
1816 return idev;
1817 }
1818 if (imr->imr_address.s_addr) {
1819 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1820 if (!dev)
1821 return NULL;
1822 }
1823
1824 if (!dev) {
1825 struct rtable *rt = ip_route_output(net,
1826 imr->imr_multiaddr.s_addr,
1827 0, 0, 0);
1828 if (!IS_ERR(rt)) {
1829 dev = rt->dst.dev;
1830 ip_rt_put(rt);
1831 }
1832 }
1833 if (dev) {
1834 imr->imr_ifindex = dev->ifindex;
1835 idev = __in_dev_get_rtnl(dev);
1836 }
1837 return idev;
1838 }
1839
1840 /*
1841 * Join a socket to a group
1842 */
1843
1844 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1845 __be32 *psfsrc)
1846 {
1847 struct ip_sf_list *psf, *psf_prev;
1848 int rv = 0;
1849
1850 psf_prev = NULL;
1851 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1852 if (psf->sf_inaddr == *psfsrc)
1853 break;
1854 psf_prev = psf;
1855 }
1856 if (!psf || psf->sf_count[sfmode] == 0) {
1857 /* source filter not found, or count wrong => bug */
1858 return -ESRCH;
1859 }
1860 psf->sf_count[sfmode]--;
1861 if (psf->sf_count[sfmode] == 0) {
1862 ip_rt_multicast_event(pmc->interface);
1863 }
1864 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1865 #ifdef CONFIG_IP_MULTICAST
1866 struct in_device *in_dev = pmc->interface;
1867 struct net *net = dev_net(in_dev->dev);
1868 #endif
1869
1870 /* no more filters for this source */
1871 if (psf_prev)
1872 psf_prev->sf_next = psf->sf_next;
1873 else
1874 pmc->sources = psf->sf_next;
1875 #ifdef CONFIG_IP_MULTICAST
1876 if (psf->sf_oldin &&
1877 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1878 psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1879 psf->sf_next = pmc->tomb;
1880 pmc->tomb = psf;
1881 rv = 1;
1882 } else
1883 #endif
1884 kfree(psf);
1885 }
1886 return rv;
1887 }
1888
1889 #ifndef CONFIG_IP_MULTICAST
1890 #define igmp_ifc_event(x) do { } while (0)
1891 #endif
1892
1893 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1894 int sfcount, __be32 *psfsrc, int delta)
1895 {
1896 struct ip_mc_list *pmc;
1897 int changerec = 0;
1898 int i, err;
1899
1900 if (!in_dev)
1901 return -ENODEV;
1902 rcu_read_lock();
1903 for_each_pmc_rcu(in_dev, pmc) {
1904 if (*pmca == pmc->multiaddr)
1905 break;
1906 }
1907 if (!pmc) {
1908 /* MCA not found?? bug */
1909 rcu_read_unlock();
1910 return -ESRCH;
1911 }
1912 spin_lock_bh(&pmc->lock);
1913 rcu_read_unlock();
1914 #ifdef CONFIG_IP_MULTICAST
1915 sf_markstate(pmc);
1916 #endif
1917 if (!delta) {
1918 err = -EINVAL;
1919 if (!pmc->sfcount[sfmode])
1920 goto out_unlock;
1921 pmc->sfcount[sfmode]--;
1922 }
1923 err = 0;
1924 for (i = 0; i < sfcount; i++) {
1925 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1926
1927 changerec |= rv > 0;
1928 if (!err && rv < 0)
1929 err = rv;
1930 }
1931 if (pmc->sfmode == MCAST_EXCLUDE &&
1932 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1933 pmc->sfcount[MCAST_INCLUDE]) {
1934 #ifdef CONFIG_IP_MULTICAST
1935 struct ip_sf_list *psf;
1936 struct net *net = dev_net(in_dev->dev);
1937 #endif
1938
1939 /* filter mode change */
1940 pmc->sfmode = MCAST_INCLUDE;
1941 #ifdef CONFIG_IP_MULTICAST
1942 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
1943 in_dev->mr_ifc_count = pmc->crcount;
1944 for (psf = pmc->sources; psf; psf = psf->sf_next)
1945 psf->sf_crcount = 0;
1946 igmp_ifc_event(pmc->interface);
1947 } else if (sf_setstate(pmc) || changerec) {
1948 igmp_ifc_event(pmc->interface);
1949 #endif
1950 }
1951 out_unlock:
1952 spin_unlock_bh(&pmc->lock);
1953 return err;
1954 }
1955
1956 /*
1957 * Add multicast single-source filter to the interface list
1958 */
1959 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1960 __be32 *psfsrc)
1961 {
1962 struct ip_sf_list *psf, *psf_prev;
1963
1964 psf_prev = NULL;
1965 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1966 if (psf->sf_inaddr == *psfsrc)
1967 break;
1968 psf_prev = psf;
1969 }
1970 if (!psf) {
1971 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1972 if (!psf)
1973 return -ENOBUFS;
1974 psf->sf_inaddr = *psfsrc;
1975 if (psf_prev) {
1976 psf_prev->sf_next = psf;
1977 } else
1978 pmc->sources = psf;
1979 }
1980 psf->sf_count[sfmode]++;
1981 if (psf->sf_count[sfmode] == 1) {
1982 ip_rt_multicast_event(pmc->interface);
1983 }
1984 return 0;
1985 }
1986
1987 #ifdef CONFIG_IP_MULTICAST
1988 static void sf_markstate(struct ip_mc_list *pmc)
1989 {
1990 struct ip_sf_list *psf;
1991 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1992
1993 for (psf = pmc->sources; psf; psf = psf->sf_next)
1994 if (pmc->sfcount[MCAST_EXCLUDE]) {
1995 psf->sf_oldin = mca_xcount ==
1996 psf->sf_count[MCAST_EXCLUDE] &&
1997 !psf->sf_count[MCAST_INCLUDE];
1998 } else
1999 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2000 }
2001
2002 static int sf_setstate(struct ip_mc_list *pmc)
2003 {
2004 struct ip_sf_list *psf, *dpsf;
2005 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
2006 int qrv = pmc->interface->mr_qrv;
2007 int new_in, rv;
2008
2009 rv = 0;
2010 for (psf = pmc->sources; psf; psf = psf->sf_next) {
2011 if (pmc->sfcount[MCAST_EXCLUDE]) {
2012 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2013 !psf->sf_count[MCAST_INCLUDE];
2014 } else
2015 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2016 if (new_in) {
2017 if (!psf->sf_oldin) {
2018 struct ip_sf_list *prev = NULL;
2019
2020 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
2021 if (dpsf->sf_inaddr == psf->sf_inaddr)
2022 break;
2023 prev = dpsf;
2024 }
2025 if (dpsf) {
2026 if (prev)
2027 prev->sf_next = dpsf->sf_next;
2028 else
2029 pmc->tomb = dpsf->sf_next;
2030 kfree(dpsf);
2031 }
2032 psf->sf_crcount = qrv;
2033 rv++;
2034 }
2035 } else if (psf->sf_oldin) {
2036
2037 psf->sf_crcount = 0;
2038 /*
2039 * add or update "delete" records if an active filter
2040 * is now inactive
2041 */
2042 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
2043 if (dpsf->sf_inaddr == psf->sf_inaddr)
2044 break;
2045 if (!dpsf) {
2046 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
2047 if (!dpsf)
2048 continue;
2049 *dpsf = *psf;
2050 /* pmc->lock held by callers */
2051 dpsf->sf_next = pmc->tomb;
2052 pmc->tomb = dpsf;
2053 }
2054 dpsf->sf_crcount = qrv;
2055 rv++;
2056 }
2057 }
2058 return rv;
2059 }
2060 #endif
2061
2062 /*
2063 * Add multicast source filter list to the interface list
2064 */
2065 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
2066 int sfcount, __be32 *psfsrc, int delta)
2067 {
2068 struct ip_mc_list *pmc;
2069 int isexclude;
2070 int i, err;
2071
2072 if (!in_dev)
2073 return -ENODEV;
2074 rcu_read_lock();
2075 for_each_pmc_rcu(in_dev, pmc) {
2076 if (*pmca == pmc->multiaddr)
2077 break;
2078 }
2079 if (!pmc) {
2080 /* MCA not found?? bug */
2081 rcu_read_unlock();
2082 return -ESRCH;
2083 }
2084 spin_lock_bh(&pmc->lock);
2085 rcu_read_unlock();
2086
2087 #ifdef CONFIG_IP_MULTICAST
2088 sf_markstate(pmc);
2089 #endif
2090 isexclude = pmc->sfmode == MCAST_EXCLUDE;
2091 if (!delta)
2092 pmc->sfcount[sfmode]++;
2093 err = 0;
2094 for (i = 0; i < sfcount; i++) {
2095 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2096 if (err)
2097 break;
2098 }
2099 if (err) {
2100 int j;
2101
2102 if (!delta)
2103 pmc->sfcount[sfmode]--;
2104 for (j = 0; j < i; j++)
2105 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2106 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2107 #ifdef CONFIG_IP_MULTICAST
2108 struct ip_sf_list *psf;
2109 struct net *net = dev_net(pmc->interface->dev);
2110 in_dev = pmc->interface;
2111 #endif
2112
2113 /* filter mode change */
2114 if (pmc->sfcount[MCAST_EXCLUDE])
2115 pmc->sfmode = MCAST_EXCLUDE;
2116 else if (pmc->sfcount[MCAST_INCLUDE])
2117 pmc->sfmode = MCAST_INCLUDE;
2118 #ifdef CONFIG_IP_MULTICAST
2119 /* else no filters; keep old mode for reports */
2120
2121 pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv;
2122 in_dev->mr_ifc_count = pmc->crcount;
2123 for (psf = pmc->sources; psf; psf = psf->sf_next)
2124 psf->sf_crcount = 0;
2125 igmp_ifc_event(in_dev);
2126 } else if (sf_setstate(pmc)) {
2127 igmp_ifc_event(in_dev);
2128 #endif
2129 }
2130 spin_unlock_bh(&pmc->lock);
2131 return err;
2132 }
2133
2134 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2135 {
2136 struct ip_sf_list *psf, *nextpsf, *tomb, *sources;
2137
2138 spin_lock_bh(&pmc->lock);
2139 tomb = pmc->tomb;
2140 pmc->tomb = NULL;
2141 sources = pmc->sources;
2142 pmc->sources = NULL;
2143 pmc->sfmode = MCAST_EXCLUDE;
2144 pmc->sfcount[MCAST_INCLUDE] = 0;
2145 pmc->sfcount[MCAST_EXCLUDE] = 1;
2146 spin_unlock_bh(&pmc->lock);
2147
2148 for (psf = tomb; psf; psf = nextpsf) {
2149 nextpsf = psf->sf_next;
2150 kfree(psf);
2151 }
2152 for (psf = sources; psf; psf = nextpsf) {
2153 nextpsf = psf->sf_next;
2154 kfree(psf);
2155 }
2156 }
2157
2158 /* Join a multicast group
2159 */
2160 static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr,
2161 unsigned int mode)
2162 {
2163 __be32 addr = imr->imr_multiaddr.s_addr;
2164 struct ip_mc_socklist *iml, *i;
2165 struct in_device *in_dev;
2166 struct inet_sock *inet = inet_sk(sk);
2167 struct net *net = sock_net(sk);
2168 int ifindex;
2169 int count = 0;
2170 int err;
2171
2172 ASSERT_RTNL();
2173
2174 if (!ipv4_is_multicast(addr))
2175 return -EINVAL;
2176
2177 in_dev = ip_mc_find_dev(net, imr);
2178
2179 if (!in_dev) {
2180 err = -ENODEV;
2181 goto done;
2182 }
2183
2184 err = -EADDRINUSE;
2185 ifindex = imr->imr_ifindex;
2186 for_each_pmc_rtnl(inet, i) {
2187 if (i->multi.imr_multiaddr.s_addr == addr &&
2188 i->multi.imr_ifindex == ifindex)
2189 goto done;
2190 count++;
2191 }
2192 err = -ENOBUFS;
2193 if (count >= net->ipv4.sysctl_igmp_max_memberships)
2194 goto done;
2195 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2196 if (!iml)
2197 goto done;
2198
2199 memcpy(&iml->multi, imr, sizeof(*imr));
2200 iml->next_rcu = inet->mc_list;
2201 iml->sflist = NULL;
2202 iml->sfmode = mode;
2203 rcu_assign_pointer(inet->mc_list, iml);
2204 __ip_mc_inc_group(in_dev, addr, mode);
2205 err = 0;
2206 done:
2207 return err;
2208 }
2209
2210 /* Join ASM (Any-Source Multicast) group
2211 */
2212 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2213 {
2214 return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE);
2215 }
2216 EXPORT_SYMBOL(ip_mc_join_group);
2217
2218 /* Join SSM (Source-Specific Multicast) group
2219 */
2220 int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr,
2221 unsigned int mode)
2222 {
2223 return __ip_mc_join_group(sk, imr, mode);
2224 }
2225
2226 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2227 struct in_device *in_dev)
2228 {
2229 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2230 int err;
2231
2232 if (!psf) {
2233 /* any-source empty exclude case */
2234 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2235 iml->sfmode, 0, NULL, 0);
2236 }
2237 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2238 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2239 RCU_INIT_POINTER(iml->sflist, NULL);
2240 /* decrease mem now to avoid the memleak warning */
2241 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2242 kfree_rcu(psf, rcu);
2243 return err;
2244 }
2245
2246 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2247 {
2248 struct inet_sock *inet = inet_sk(sk);
2249 struct ip_mc_socklist *iml;
2250 struct ip_mc_socklist __rcu **imlp;
2251 struct in_device *in_dev;
2252 struct net *net = sock_net(sk);
2253 __be32 group = imr->imr_multiaddr.s_addr;
2254 u32 ifindex;
2255 int ret = -EADDRNOTAVAIL;
2256
2257 ASSERT_RTNL();
2258
2259 in_dev = ip_mc_find_dev(net, imr);
2260 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2261 ret = -ENODEV;
2262 goto out;
2263 }
2264 ifindex = imr->imr_ifindex;
2265 for (imlp = &inet->mc_list;
2266 (iml = rtnl_dereference(*imlp)) != NULL;
2267 imlp = &iml->next_rcu) {
2268 if (iml->multi.imr_multiaddr.s_addr != group)
2269 continue;
2270 if (ifindex) {
2271 if (iml->multi.imr_ifindex != ifindex)
2272 continue;
2273 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2274 iml->multi.imr_address.s_addr)
2275 continue;
2276
2277 (void) ip_mc_leave_src(sk, iml, in_dev);
2278
2279 *imlp = iml->next_rcu;
2280
2281 if (in_dev)
2282 ip_mc_dec_group(in_dev, group);
2283
2284 /* decrease mem now to avoid the memleak warning */
2285 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2286 kfree_rcu(iml, rcu);
2287 return 0;
2288 }
2289 out:
2290 return ret;
2291 }
2292 EXPORT_SYMBOL(ip_mc_leave_group);
2293
2294 int ip_mc_source(int add, int omode, struct sock *sk, struct
2295 ip_mreq_source *mreqs, int ifindex)
2296 {
2297 int err;
2298 struct ip_mreqn imr;
2299 __be32 addr = mreqs->imr_multiaddr;
2300 struct ip_mc_socklist *pmc;
2301 struct in_device *in_dev = NULL;
2302 struct inet_sock *inet = inet_sk(sk);
2303 struct ip_sf_socklist *psl;
2304 struct net *net = sock_net(sk);
2305 int leavegroup = 0;
2306 int i, j, rv;
2307
2308 if (!ipv4_is_multicast(addr))
2309 return -EINVAL;
2310
2311 ASSERT_RTNL();
2312
2313 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2314 imr.imr_address.s_addr = mreqs->imr_interface;
2315 imr.imr_ifindex = ifindex;
2316 in_dev = ip_mc_find_dev(net, &imr);
2317
2318 if (!in_dev) {
2319 err = -ENODEV;
2320 goto done;
2321 }
2322 err = -EADDRNOTAVAIL;
2323
2324 for_each_pmc_rtnl(inet, pmc) {
2325 if ((pmc->multi.imr_multiaddr.s_addr ==
2326 imr.imr_multiaddr.s_addr) &&
2327 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2328 break;
2329 }
2330 if (!pmc) { /* must have a prior join */
2331 err = -EINVAL;
2332 goto done;
2333 }
2334 /* if a source filter was set, must be the same mode as before */
2335 if (pmc->sflist) {
2336 if (pmc->sfmode != omode) {
2337 err = -EINVAL;
2338 goto done;
2339 }
2340 } else if (pmc->sfmode != omode) {
2341 /* allow mode switches for empty-set filters */
2342 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2343 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2344 NULL, 0);
2345 pmc->sfmode = omode;
2346 }
2347
2348 psl = rtnl_dereference(pmc->sflist);
2349 if (!add) {
2350 if (!psl)
2351 goto done; /* err = -EADDRNOTAVAIL */
2352 rv = !0;
2353 for (i = 0; i < psl->sl_count; i++) {
2354 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2355 sizeof(__be32));
2356 if (rv == 0)
2357 break;
2358 }
2359 if (rv) /* source not found */
2360 goto done; /* err = -EADDRNOTAVAIL */
2361
2362 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2363 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2364 leavegroup = 1;
2365 goto done;
2366 }
2367
2368 /* update the interface filter */
2369 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2370 &mreqs->imr_sourceaddr, 1);
2371
2372 for (j = i+1; j < psl->sl_count; j++)
2373 psl->sl_addr[j-1] = psl->sl_addr[j];
2374 psl->sl_count--;
2375 err = 0;
2376 goto done;
2377 }
2378 /* else, add a new source to the filter */
2379
2380 if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) {
2381 err = -ENOBUFS;
2382 goto done;
2383 }
2384 if (!psl || psl->sl_count == psl->sl_max) {
2385 struct ip_sf_socklist *newpsl;
2386 int count = IP_SFBLOCK;
2387
2388 if (psl)
2389 count += psl->sl_max;
2390 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2391 if (!newpsl) {
2392 err = -ENOBUFS;
2393 goto done;
2394 }
2395 newpsl->sl_max = count;
2396 newpsl->sl_count = count - IP_SFBLOCK;
2397 if (psl) {
2398 for (i = 0; i < psl->sl_count; i++)
2399 newpsl->sl_addr[i] = psl->sl_addr[i];
2400 /* decrease mem now to avoid the memleak warning */
2401 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2402 kfree_rcu(psl, rcu);
2403 }
2404 rcu_assign_pointer(pmc->sflist, newpsl);
2405 psl = newpsl;
2406 }
2407 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2408 for (i = 0; i < psl->sl_count; i++) {
2409 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2410 sizeof(__be32));
2411 if (rv == 0)
2412 break;
2413 }
2414 if (rv == 0) /* address already there is an error */
2415 goto done;
2416 for (j = psl->sl_count-1; j >= i; j--)
2417 psl->sl_addr[j+1] = psl->sl_addr[j];
2418 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2419 psl->sl_count++;
2420 err = 0;
2421 /* update the interface list */
2422 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2423 &mreqs->imr_sourceaddr, 1);
2424 done:
2425 if (leavegroup)
2426 err = ip_mc_leave_group(sk, &imr);
2427 return err;
2428 }
2429
2430 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2431 {
2432 int err = 0;
2433 struct ip_mreqn imr;
2434 __be32 addr = msf->imsf_multiaddr;
2435 struct ip_mc_socklist *pmc;
2436 struct in_device *in_dev;
2437 struct inet_sock *inet = inet_sk(sk);
2438 struct ip_sf_socklist *newpsl, *psl;
2439 struct net *net = sock_net(sk);
2440 int leavegroup = 0;
2441
2442 if (!ipv4_is_multicast(addr))
2443 return -EINVAL;
2444 if (msf->imsf_fmode != MCAST_INCLUDE &&
2445 msf->imsf_fmode != MCAST_EXCLUDE)
2446 return -EINVAL;
2447
2448 ASSERT_RTNL();
2449
2450 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2451 imr.imr_address.s_addr = msf->imsf_interface;
2452 imr.imr_ifindex = ifindex;
2453 in_dev = ip_mc_find_dev(net, &imr);
2454
2455 if (!in_dev) {
2456 err = -ENODEV;
2457 goto done;
2458 }
2459
2460 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2461 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2462 leavegroup = 1;
2463 goto done;
2464 }
2465
2466 for_each_pmc_rtnl(inet, pmc) {
2467 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2468 pmc->multi.imr_ifindex == imr.imr_ifindex)
2469 break;
2470 }
2471 if (!pmc) { /* must have a prior join */
2472 err = -EINVAL;
2473 goto done;
2474 }
2475 if (msf->imsf_numsrc) {
2476 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2477 GFP_KERNEL);
2478 if (!newpsl) {
2479 err = -ENOBUFS;
2480 goto done;
2481 }
2482 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2483 memcpy(newpsl->sl_addr, msf->imsf_slist,
2484 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2485 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2486 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2487 if (err) {
2488 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2489 goto done;
2490 }
2491 } else {
2492 newpsl = NULL;
2493 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2494 msf->imsf_fmode, 0, NULL, 0);
2495 }
2496 psl = rtnl_dereference(pmc->sflist);
2497 if (psl) {
2498 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2499 psl->sl_count, psl->sl_addr, 0);
2500 /* decrease mem now to avoid the memleak warning */
2501 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2502 kfree_rcu(psl, rcu);
2503 } else
2504 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2505 0, NULL, 0);
2506 rcu_assign_pointer(pmc->sflist, newpsl);
2507 pmc->sfmode = msf->imsf_fmode;
2508 err = 0;
2509 done:
2510 if (leavegroup)
2511 err = ip_mc_leave_group(sk, &imr);
2512 return err;
2513 }
2514
2515 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2516 struct ip_msfilter __user *optval, int __user *optlen)
2517 {
2518 int err, len, count, copycount;
2519 struct ip_mreqn imr;
2520 __be32 addr = msf->imsf_multiaddr;
2521 struct ip_mc_socklist *pmc;
2522 struct in_device *in_dev;
2523 struct inet_sock *inet = inet_sk(sk);
2524 struct ip_sf_socklist *psl;
2525 struct net *net = sock_net(sk);
2526
2527 ASSERT_RTNL();
2528
2529 if (!ipv4_is_multicast(addr))
2530 return -EINVAL;
2531
2532 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2533 imr.imr_address.s_addr = msf->imsf_interface;
2534 imr.imr_ifindex = 0;
2535 in_dev = ip_mc_find_dev(net, &imr);
2536
2537 if (!in_dev) {
2538 err = -ENODEV;
2539 goto done;
2540 }
2541 err = -EADDRNOTAVAIL;
2542
2543 for_each_pmc_rtnl(inet, pmc) {
2544 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2545 pmc->multi.imr_ifindex == imr.imr_ifindex)
2546 break;
2547 }
2548 if (!pmc) /* must have a prior join */
2549 goto done;
2550 msf->imsf_fmode = pmc->sfmode;
2551 psl = rtnl_dereference(pmc->sflist);
2552 if (!psl) {
2553 len = 0;
2554 count = 0;
2555 } else {
2556 count = psl->sl_count;
2557 }
2558 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2559 len = copycount * sizeof(psl->sl_addr[0]);
2560 msf->imsf_numsrc = count;
2561 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2562 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2563 return -EFAULT;
2564 }
2565 if (len &&
2566 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2567 return -EFAULT;
2568 return 0;
2569 done:
2570 return err;
2571 }
2572
2573 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2574 struct group_filter __user *optval, int __user *optlen)
2575 {
2576 int err, i, count, copycount;
2577 struct sockaddr_in *psin;
2578 __be32 addr;
2579 struct ip_mc_socklist *pmc;
2580 struct inet_sock *inet = inet_sk(sk);
2581 struct ip_sf_socklist *psl;
2582
2583 ASSERT_RTNL();
2584
2585 psin = (struct sockaddr_in *)&gsf->gf_group;
2586 if (psin->sin_family != AF_INET)
2587 return -EINVAL;
2588 addr = psin->sin_addr.s_addr;
2589 if (!ipv4_is_multicast(addr))
2590 return -EINVAL;
2591
2592 err = -EADDRNOTAVAIL;
2593
2594 for_each_pmc_rtnl(inet, pmc) {
2595 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2596 pmc->multi.imr_ifindex == gsf->gf_interface)
2597 break;
2598 }
2599 if (!pmc) /* must have a prior join */
2600 goto done;
2601 gsf->gf_fmode = pmc->sfmode;
2602 psl = rtnl_dereference(pmc->sflist);
2603 count = psl ? psl->sl_count : 0;
2604 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2605 gsf->gf_numsrc = count;
2606 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2607 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2608 return -EFAULT;
2609 }
2610 for (i = 0; i < copycount; i++) {
2611 struct sockaddr_storage ss;
2612
2613 psin = (struct sockaddr_in *)&ss;
2614 memset(&ss, 0, sizeof(ss));
2615 psin->sin_family = AF_INET;
2616 psin->sin_addr.s_addr = psl->sl_addr[i];
2617 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2618 return -EFAULT;
2619 }
2620 return 0;
2621 done:
2622 return err;
2623 }
2624
2625 /*
2626 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2627 */
2628 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr,
2629 int dif, int sdif)
2630 {
2631 struct inet_sock *inet = inet_sk(sk);
2632 struct ip_mc_socklist *pmc;
2633 struct ip_sf_socklist *psl;
2634 int i;
2635 int ret;
2636
2637 ret = 1;
2638 if (!ipv4_is_multicast(loc_addr))
2639 goto out;
2640
2641 rcu_read_lock();
2642 for_each_pmc_rcu(inet, pmc) {
2643 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2644 (pmc->multi.imr_ifindex == dif ||
2645 (sdif && pmc->multi.imr_ifindex == sdif)))
2646 break;
2647 }
2648 ret = inet->mc_all;
2649 if (!pmc)
2650 goto unlock;
2651 psl = rcu_dereference(pmc->sflist);
2652 ret = (pmc->sfmode == MCAST_EXCLUDE);
2653 if (!psl)
2654 goto unlock;
2655
2656 for (i = 0; i < psl->sl_count; i++) {
2657 if (psl->sl_addr[i] == rmt_addr)
2658 break;
2659 }
2660 ret = 0;
2661 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2662 goto unlock;
2663 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2664 goto unlock;
2665 ret = 1;
2666 unlock:
2667 rcu_read_unlock();
2668 out:
2669 return ret;
2670 }
2671
2672 /*
2673 * A socket is closing.
2674 */
2675
2676 void ip_mc_drop_socket(struct sock *sk)
2677 {
2678 struct inet_sock *inet = inet_sk(sk);
2679 struct ip_mc_socklist *iml;
2680 struct net *net = sock_net(sk);
2681
2682 if (!inet->mc_list)
2683 return;
2684
2685 rtnl_lock();
2686 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2687 struct in_device *in_dev;
2688
2689 inet->mc_list = iml->next_rcu;
2690 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2691 (void) ip_mc_leave_src(sk, iml, in_dev);
2692 if (in_dev)
2693 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2694 /* decrease mem now to avoid the memleak warning */
2695 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2696 kfree_rcu(iml, rcu);
2697 }
2698 rtnl_unlock();
2699 }
2700
2701 /* called with rcu_read_lock() */
2702 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2703 {
2704 struct ip_mc_list *im;
2705 struct ip_mc_list __rcu **mc_hash;
2706 struct ip_sf_list *psf;
2707 int rv = 0;
2708
2709 mc_hash = rcu_dereference(in_dev->mc_hash);
2710 if (mc_hash) {
2711 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2712
2713 for (im = rcu_dereference(mc_hash[hash]);
2714 im != NULL;
2715 im = rcu_dereference(im->next_hash)) {
2716 if (im->multiaddr == mc_addr)
2717 break;
2718 }
2719 } else {
2720 for_each_pmc_rcu(in_dev, im) {
2721 if (im->multiaddr == mc_addr)
2722 break;
2723 }
2724 }
2725 if (im && proto == IPPROTO_IGMP) {
2726 rv = 1;
2727 } else if (im) {
2728 if (src_addr) {
2729 for (psf = im->sources; psf; psf = psf->sf_next) {
2730 if (psf->sf_inaddr == src_addr)
2731 break;
2732 }
2733 if (psf)
2734 rv = psf->sf_count[MCAST_INCLUDE] ||
2735 psf->sf_count[MCAST_EXCLUDE] !=
2736 im->sfcount[MCAST_EXCLUDE];
2737 else
2738 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2739 } else
2740 rv = 1; /* unspecified source; tentatively allow */
2741 }
2742 return rv;
2743 }
2744
2745 #if defined(CONFIG_PROC_FS)
2746 struct igmp_mc_iter_state {
2747 struct seq_net_private p;
2748 struct net_device *dev;
2749 struct in_device *in_dev;
2750 };
2751
2752 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2753
2754 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2755 {
2756 struct net *net = seq_file_net(seq);
2757 struct ip_mc_list *im = NULL;
2758 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2759
2760 state->in_dev = NULL;
2761 for_each_netdev_rcu(net, state->dev) {
2762 struct in_device *in_dev;
2763
2764 in_dev = __in_dev_get_rcu(state->dev);
2765 if (!in_dev)
2766 continue;
2767 im = rcu_dereference(in_dev->mc_list);
2768 if (im) {
2769 state->in_dev = in_dev;
2770 break;
2771 }
2772 }
2773 return im;
2774 }
2775
2776 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2777 {
2778 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2779
2780 im = rcu_dereference(im->next_rcu);
2781 while (!im) {
2782 state->dev = next_net_device_rcu(state->dev);
2783 if (!state->dev) {
2784 state->in_dev = NULL;
2785 break;
2786 }
2787 state->in_dev = __in_dev_get_rcu(state->dev);
2788 if (!state->in_dev)
2789 continue;
2790 im = rcu_dereference(state->in_dev->mc_list);
2791 }
2792 return im;
2793 }
2794
2795 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2796 {
2797 struct ip_mc_list *im = igmp_mc_get_first(seq);
2798 if (im)
2799 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2800 --pos;
2801 return pos ? NULL : im;
2802 }
2803
2804 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2805 __acquires(rcu)
2806 {
2807 rcu_read_lock();
2808 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2809 }
2810
2811 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2812 {
2813 struct ip_mc_list *im;
2814 if (v == SEQ_START_TOKEN)
2815 im = igmp_mc_get_first(seq);
2816 else
2817 im = igmp_mc_get_next(seq, v);
2818 ++*pos;
2819 return im;
2820 }
2821
2822 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2823 __releases(rcu)
2824 {
2825 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2826
2827 state->in_dev = NULL;
2828 state->dev = NULL;
2829 rcu_read_unlock();
2830 }
2831
2832 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2833 {
2834 if (v == SEQ_START_TOKEN)
2835 seq_puts(seq,
2836 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2837 else {
2838 struct ip_mc_list *im = (struct ip_mc_list *)v;
2839 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2840 char *querier;
2841 long delta;
2842
2843 #ifdef CONFIG_IP_MULTICAST
2844 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2845 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2846 "V3";
2847 #else
2848 querier = "NONE";
2849 #endif
2850
2851 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2852 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2853 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2854 }
2855
2856 delta = im->timer.expires - jiffies;
2857 seq_printf(seq,
2858 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2859 im->multiaddr, im->users,
2860 im->tm_running,
2861 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2862 im->reporter);
2863 }
2864 return 0;
2865 }
2866
2867 static const struct seq_operations igmp_mc_seq_ops = {
2868 .start = igmp_mc_seq_start,
2869 .next = igmp_mc_seq_next,
2870 .stop = igmp_mc_seq_stop,
2871 .show = igmp_mc_seq_show,
2872 };
2873
2874 struct igmp_mcf_iter_state {
2875 struct seq_net_private p;
2876 struct net_device *dev;
2877 struct in_device *idev;
2878 struct ip_mc_list *im;
2879 };
2880
2881 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2882
2883 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2884 {
2885 struct net *net = seq_file_net(seq);
2886 struct ip_sf_list *psf = NULL;
2887 struct ip_mc_list *im = NULL;
2888 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2889
2890 state->idev = NULL;
2891 state->im = NULL;
2892 for_each_netdev_rcu(net, state->dev) {
2893 struct in_device *idev;
2894 idev = __in_dev_get_rcu(state->dev);
2895 if (unlikely(!idev))
2896 continue;
2897 im = rcu_dereference(idev->mc_list);
2898 if (likely(im)) {
2899 spin_lock_bh(&im->lock);
2900 psf = im->sources;
2901 if (likely(psf)) {
2902 state->im = im;
2903 state->idev = idev;
2904 break;
2905 }
2906 spin_unlock_bh(&im->lock);
2907 }
2908 }
2909 return psf;
2910 }
2911
2912 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2913 {
2914 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2915
2916 psf = psf->sf_next;
2917 while (!psf) {
2918 spin_unlock_bh(&state->im->lock);
2919 state->im = state->im->next;
2920 while (!state->im) {
2921 state->dev = next_net_device_rcu(state->dev);
2922 if (!state->dev) {
2923 state->idev = NULL;
2924 goto out;
2925 }
2926 state->idev = __in_dev_get_rcu(state->dev);
2927 if (!state->idev)
2928 continue;
2929 state->im = rcu_dereference(state->idev->mc_list);
2930 }
2931 if (!state->im)
2932 break;
2933 spin_lock_bh(&state->im->lock);
2934 psf = state->im->sources;
2935 }
2936 out:
2937 return psf;
2938 }
2939
2940 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2941 {
2942 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2943 if (psf)
2944 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2945 --pos;
2946 return pos ? NULL : psf;
2947 }
2948
2949 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2950 __acquires(rcu)
2951 {
2952 rcu_read_lock();
2953 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2954 }
2955
2956 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2957 {
2958 struct ip_sf_list *psf;
2959 if (v == SEQ_START_TOKEN)
2960 psf = igmp_mcf_get_first(seq);
2961 else
2962 psf = igmp_mcf_get_next(seq, v);
2963 ++*pos;
2964 return psf;
2965 }
2966
2967 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2968 __releases(rcu)
2969 {
2970 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2971 if (likely(state->im)) {
2972 spin_unlock_bh(&state->im->lock);
2973 state->im = NULL;
2974 }
2975 state->idev = NULL;
2976 state->dev = NULL;
2977 rcu_read_unlock();
2978 }
2979
2980 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2981 {
2982 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2983 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2984
2985 if (v == SEQ_START_TOKEN) {
2986 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2987 } else {
2988 seq_printf(seq,
2989 "%3d %6.6s 0x%08x "
2990 "0x%08x %6lu %6lu\n",
2991 state->dev->ifindex, state->dev->name,
2992 ntohl(state->im->multiaddr),
2993 ntohl(psf->sf_inaddr),
2994 psf->sf_count[MCAST_INCLUDE],
2995 psf->sf_count[MCAST_EXCLUDE]);
2996 }
2997 return 0;
2998 }
2999
3000 static const struct seq_operations igmp_mcf_seq_ops = {
3001 .start = igmp_mcf_seq_start,
3002 .next = igmp_mcf_seq_next,
3003 .stop = igmp_mcf_seq_stop,
3004 .show = igmp_mcf_seq_show,
3005 };
3006
3007 static int __net_init igmp_net_init(struct net *net)
3008 {
3009 struct proc_dir_entry *pde;
3010 int err;
3011
3012 pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops,
3013 sizeof(struct igmp_mc_iter_state));
3014 if (!pde)
3015 goto out_igmp;
3016 pde = proc_create_net("mcfilter", 0444, net->proc_net,
3017 &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state));
3018 if (!pde)
3019 goto out_mcfilter;
3020 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
3021 SOCK_DGRAM, 0, net);
3022 if (err < 0) {
3023 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
3024 err);
3025 goto out_sock;
3026 }
3027
3028 return 0;
3029
3030 out_sock:
3031 remove_proc_entry("mcfilter", net->proc_net);
3032 out_mcfilter:
3033 remove_proc_entry("igmp", net->proc_net);
3034 out_igmp:
3035 return -ENOMEM;
3036 }
3037
3038 static void __net_exit igmp_net_exit(struct net *net)
3039 {
3040 remove_proc_entry("mcfilter", net->proc_net);
3041 remove_proc_entry("igmp", net->proc_net);
3042 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
3043 }
3044
3045 static struct pernet_operations igmp_net_ops = {
3046 .init = igmp_net_init,
3047 .exit = igmp_net_exit,
3048 };
3049 #endif
3050
3051 static int igmp_netdev_event(struct notifier_block *this,
3052 unsigned long event, void *ptr)
3053 {
3054 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
3055 struct in_device *in_dev;
3056
3057 switch (event) {
3058 case NETDEV_RESEND_IGMP:
3059 in_dev = __in_dev_get_rtnl(dev);
3060 if (in_dev)
3061 ip_mc_rejoin_groups(in_dev);
3062 break;
3063 default:
3064 break;
3065 }
3066 return NOTIFY_DONE;
3067 }
3068
3069 static struct notifier_block igmp_notifier = {
3070 .notifier_call = igmp_netdev_event,
3071 };
3072
3073 int __init igmp_mc_init(void)
3074 {
3075 #if defined(CONFIG_PROC_FS)
3076 int err;
3077
3078 err = register_pernet_subsys(&igmp_net_ops);
3079 if (err)
3080 return err;
3081 err = register_netdevice_notifier(&igmp_notifier);
3082 if (err)
3083 goto reg_notif_fail;
3084 return 0;
3085
3086 reg_notif_fail:
3087 unregister_pernet_subsys(&igmp_net_ops);
3088 return err;
3089 #else
3090 return register_netdevice_notifier(&igmp_notifier);
3091 #endif
3092 }
Linux with added FPC-III support