2 * Linux NET3: Internet Group Management Protocol [IGMP]
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.
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.
12 * Alan Cox <alan@lxorguk.ukuu.org.uk>
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.
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
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
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"
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
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
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>
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>
93 #include <net/net_namespace.h>
96 #include <net/protocol.h>
97 #include <net/route.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>
105 #ifdef CONFIG_PROC_FS
106 #include <linux/proc_fs.h>
107 #include <linux/seq_file.h>
110 #define IP_MAX_MEMBERSHIPS 20
111 #define IP_MAX_MSF 10
113 /* IGMP reports for link-local multicast groups are enabled by default */
114 int sysctl_igmp_llm_reports __read_mostly = 1;
116 #ifdef CONFIG_IP_MULTICAST
117 /* Parameter names and values are taken from igmp-v2-06 draft */
119 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
120 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
121 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
122 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
123 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
124 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
127 #define IGMP_INITIAL_REPORT_DELAY (1)
129 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
130 * IGMP specs require to report membership immediately after
131 * joining a group, but we delay the first report by a
132 * small interval. It seems more natural and still does not
133 * contradict to specs provided this delay is small enough.
136 #define IGMP_V1_SEEN(in_dev) \
137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
139 ((in_dev)->mr_v1_seen && \
140 time_before(jiffies, (in_dev)->mr_v1_seen)))
141 #define IGMP_V2_SEEN(in_dev) \
142 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
143 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
144 ((in_dev)->mr_v2_seen && \
145 time_before(jiffies, (in_dev)->mr_v2_seen)))
147 static int unsolicited_report_interval(struct in_device *in_dev)
149 int interval_ms, interval_jiffies;
151 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
152 interval_ms = IN_DEV_CONF_GET(
154 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
156 interval_ms = IN_DEV_CONF_GET(
158 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
160 interval_jiffies = msecs_to_jiffies(interval_ms);
162 /* _timer functions can't handle a delay of 0 jiffies so ensure
163 * we always return a positive value.
165 if (interval_jiffies <= 0)
166 interval_jiffies = 1;
167 return interval_jiffies;
170 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
171 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
172 static void igmpv3_clear_delrec(struct in_device *in_dev);
173 static int sf_setstate(struct ip_mc_list *pmc);
174 static void sf_markstate(struct ip_mc_list *pmc);
176 static void ip_mc_clear_src(struct ip_mc_list *pmc);
177 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
178 int sfcount, __be32 *psfsrc, int delta);
180 static void ip_ma_put(struct ip_mc_list *im)
182 if (atomic_dec_and_test(&im->refcnt)) {
183 in_dev_put(im->interface);
188 #define for_each_pmc_rcu(in_dev, pmc) \
189 for (pmc = rcu_dereference(in_dev->mc_list); \
191 pmc = rcu_dereference(pmc->next_rcu))
193 #define for_each_pmc_rtnl(in_dev, pmc) \
194 for (pmc = rtnl_dereference(in_dev->mc_list); \
196 pmc = rtnl_dereference(pmc->next_rcu))
198 #ifdef CONFIG_IP_MULTICAST
204 static void igmp_stop_timer(struct ip_mc_list *im)
206 spin_lock_bh(&im->lock);
207 if (del_timer(&im->timer))
208 atomic_dec(&im->refcnt);
211 im->unsolicit_count = 0;
212 spin_unlock_bh(&im->lock);
215 /* It must be called with locked im->lock */
216 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
218 int tv = prandom_u32() % max_delay;
221 if (!mod_timer(&im->timer, jiffies+tv+2))
222 atomic_inc(&im->refcnt);
225 static void igmp_gq_start_timer(struct in_device *in_dev)
227 int tv = prandom_u32() % in_dev->mr_maxdelay;
228 unsigned long exp = jiffies + tv + 2;
230 if (in_dev->mr_gq_running &&
231 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
234 in_dev->mr_gq_running = 1;
235 if (!mod_timer(&in_dev->mr_gq_timer, exp))
239 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
241 int tv = prandom_u32() % delay;
243 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
247 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
249 spin_lock_bh(&im->lock);
250 im->unsolicit_count = 0;
251 if (del_timer(&im->timer)) {
252 if ((long)(im->timer.expires-jiffies) < max_delay) {
253 add_timer(&im->timer);
255 spin_unlock_bh(&im->lock);
258 atomic_dec(&im->refcnt);
260 igmp_start_timer(im, max_delay);
261 spin_unlock_bh(&im->lock);
266 * Send an IGMP report.
269 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
272 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
273 int gdeleted, int sdeleted)
276 case IGMPV3_MODE_IS_INCLUDE:
277 case IGMPV3_MODE_IS_EXCLUDE:
278 if (gdeleted || sdeleted)
280 if (!(pmc->gsquery && !psf->sf_gsresp)) {
281 if (pmc->sfmode == MCAST_INCLUDE)
283 /* don't include if this source is excluded
286 if (psf->sf_count[MCAST_INCLUDE])
287 return type == IGMPV3_MODE_IS_INCLUDE;
288 return pmc->sfcount[MCAST_EXCLUDE] ==
289 psf->sf_count[MCAST_EXCLUDE];
292 case IGMPV3_CHANGE_TO_INCLUDE:
293 if (gdeleted || sdeleted)
295 return psf->sf_count[MCAST_INCLUDE] != 0;
296 case IGMPV3_CHANGE_TO_EXCLUDE:
297 if (gdeleted || sdeleted)
299 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
300 psf->sf_count[MCAST_INCLUDE])
302 return pmc->sfcount[MCAST_EXCLUDE] ==
303 psf->sf_count[MCAST_EXCLUDE];
304 case IGMPV3_ALLOW_NEW_SOURCES:
305 if (gdeleted || !psf->sf_crcount)
307 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
308 case IGMPV3_BLOCK_OLD_SOURCES:
309 if (pmc->sfmode == MCAST_INCLUDE)
310 return gdeleted || (psf->sf_crcount && sdeleted);
311 return psf->sf_crcount && !gdeleted && !sdeleted;
317 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
319 struct ip_sf_list *psf;
322 for (psf = pmc->sources; psf; psf = psf->sf_next) {
323 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
330 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
335 struct igmpv3_report *pig;
336 struct net *net = dev_net(dev);
338 int hlen = LL_RESERVED_SPACE(dev);
339 int tlen = dev->needed_tailroom;
340 unsigned int size = mtu;
343 skb = alloc_skb(size + hlen + tlen,
344 GFP_ATOMIC | __GFP_NOWARN);
351 skb->priority = TC_PRIO_CONTROL;
353 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
355 IPPROTO_IGMP, 0, dev->ifindex);
361 skb_dst_set(skb, &rt->dst);
364 skb_reserve(skb, hlen);
365 skb_tailroom_reserve(skb, mtu, tlen);
367 skb_reset_network_header(skb);
369 skb_put(skb, sizeof(struct iphdr) + 4);
372 pip->ihl = (sizeof(struct iphdr)+4)>>2;
374 pip->frag_off = htons(IP_DF);
376 pip->daddr = fl4.daddr;
377 pip->saddr = fl4.saddr;
378 pip->protocol = IPPROTO_IGMP;
379 pip->tot_len = 0; /* filled in later */
380 ip_select_ident(net, skb, NULL);
381 ((u8 *)&pip[1])[0] = IPOPT_RA;
382 ((u8 *)&pip[1])[1] = 4;
383 ((u8 *)&pip[1])[2] = 0;
384 ((u8 *)&pip[1])[3] = 0;
386 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
387 skb_put(skb, sizeof(*pig));
388 pig = igmpv3_report_hdr(skb);
389 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
397 static int igmpv3_sendpack(struct sk_buff *skb)
399 struct igmphdr *pig = igmp_hdr(skb);
400 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
402 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
404 return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
407 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
409 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
412 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
413 int type, struct igmpv3_grec **ppgr)
415 struct net_device *dev = pmc->interface->dev;
416 struct igmpv3_report *pih;
417 struct igmpv3_grec *pgr;
420 skb = igmpv3_newpack(dev, dev->mtu);
423 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
424 pgr->grec_type = type;
425 pgr->grec_auxwords = 0;
427 pgr->grec_mca = pmc->multiaddr;
428 pih = igmpv3_report_hdr(skb);
429 pih->ngrec = htons(ntohs(pih->ngrec)+1);
434 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
436 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
437 int type, int gdeleted, int sdeleted)
439 struct net_device *dev = pmc->interface->dev;
440 struct igmpv3_report *pih;
441 struct igmpv3_grec *pgr = NULL;
442 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
443 int scount, stotal, first, isquery, truncate;
445 if (pmc->multiaddr == IGMP_ALL_HOSTS)
447 if (ipv4_is_local_multicast(pmc->multiaddr) && !sysctl_igmp_llm_reports)
450 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
451 type == IGMPV3_MODE_IS_EXCLUDE;
452 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
453 type == IGMPV3_CHANGE_TO_EXCLUDE;
457 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
462 pih = skb ? igmpv3_report_hdr(skb) : NULL;
464 /* EX and TO_EX get a fresh packet, if needed */
466 if (pih && pih->ngrec &&
467 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
469 igmpv3_sendpack(skb);
470 skb = igmpv3_newpack(dev, dev->mtu);
475 for (psf = *psf_list; psf; psf = psf_next) {
478 psf_next = psf->sf_next;
480 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
485 /* clear marks on query responses */
489 if (AVAILABLE(skb) < sizeof(__be32) +
490 first*sizeof(struct igmpv3_grec)) {
491 if (truncate && !first)
492 break; /* truncate these */
494 pgr->grec_nsrcs = htons(scount);
496 igmpv3_sendpack(skb);
497 skb = igmpv3_newpack(dev, dev->mtu);
502 skb = add_grhead(skb, pmc, type, &pgr);
507 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
508 *psrc = psf->sf_inaddr;
510 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
511 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
513 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
515 psf_prev->sf_next = psf->sf_next;
517 *psf_list = psf->sf_next;
527 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
528 type == IGMPV3_BLOCK_OLD_SOURCES)
530 if (pmc->crcount || isquery) {
531 /* make sure we have room for group header */
532 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
533 igmpv3_sendpack(skb);
534 skb = NULL; /* add_grhead will get a new one */
536 skb = add_grhead(skb, pmc, type, &pgr);
540 pgr->grec_nsrcs = htons(scount);
543 pmc->gsquery = 0; /* clear query state on report */
547 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
549 struct sk_buff *skb = NULL;
554 for_each_pmc_rcu(in_dev, pmc) {
555 if (pmc->multiaddr == IGMP_ALL_HOSTS)
557 if (ipv4_is_local_multicast(pmc->multiaddr) &&
558 !sysctl_igmp_llm_reports)
560 spin_lock_bh(&pmc->lock);
561 if (pmc->sfcount[MCAST_EXCLUDE])
562 type = IGMPV3_MODE_IS_EXCLUDE;
564 type = IGMPV3_MODE_IS_INCLUDE;
565 skb = add_grec(skb, pmc, type, 0, 0);
566 spin_unlock_bh(&pmc->lock);
570 spin_lock_bh(&pmc->lock);
571 if (pmc->sfcount[MCAST_EXCLUDE])
572 type = IGMPV3_MODE_IS_EXCLUDE;
574 type = IGMPV3_MODE_IS_INCLUDE;
575 skb = add_grec(skb, pmc, type, 0, 0);
576 spin_unlock_bh(&pmc->lock);
580 return igmpv3_sendpack(skb);
584 * remove zero-count source records from a source filter list
586 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
588 struct ip_sf_list *psf_prev, *psf_next, *psf;
591 for (psf = *ppsf; psf; psf = psf_next) {
592 psf_next = psf->sf_next;
593 if (psf->sf_crcount == 0) {
595 psf_prev->sf_next = psf->sf_next;
597 *ppsf = psf->sf_next;
604 static void igmpv3_send_cr(struct in_device *in_dev)
606 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
607 struct sk_buff *skb = NULL;
611 spin_lock_bh(&in_dev->mc_tomb_lock);
615 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
616 pmc_next = pmc->next;
617 if (pmc->sfmode == MCAST_INCLUDE) {
618 type = IGMPV3_BLOCK_OLD_SOURCES;
619 dtype = IGMPV3_BLOCK_OLD_SOURCES;
620 skb = add_grec(skb, pmc, type, 1, 0);
621 skb = add_grec(skb, pmc, dtype, 1, 1);
624 if (pmc->sfmode == MCAST_EXCLUDE) {
625 type = IGMPV3_CHANGE_TO_INCLUDE;
626 skb = add_grec(skb, pmc, type, 1, 0);
629 if (pmc->crcount == 0) {
630 igmpv3_clear_zeros(&pmc->tomb);
631 igmpv3_clear_zeros(&pmc->sources);
634 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
636 pmc_prev->next = pmc_next;
638 in_dev->mc_tomb = pmc_next;
639 in_dev_put(pmc->interface);
644 spin_unlock_bh(&in_dev->mc_tomb_lock);
647 for_each_pmc_rcu(in_dev, pmc) {
648 spin_lock_bh(&pmc->lock);
649 if (pmc->sfcount[MCAST_EXCLUDE]) {
650 type = IGMPV3_BLOCK_OLD_SOURCES;
651 dtype = IGMPV3_ALLOW_NEW_SOURCES;
653 type = IGMPV3_ALLOW_NEW_SOURCES;
654 dtype = IGMPV3_BLOCK_OLD_SOURCES;
656 skb = add_grec(skb, pmc, type, 0, 0);
657 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
659 /* filter mode changes */
661 if (pmc->sfmode == MCAST_EXCLUDE)
662 type = IGMPV3_CHANGE_TO_EXCLUDE;
664 type = IGMPV3_CHANGE_TO_INCLUDE;
665 skb = add_grec(skb, pmc, type, 0, 0);
668 spin_unlock_bh(&pmc->lock);
674 (void) igmpv3_sendpack(skb);
677 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
684 struct net_device *dev = in_dev->dev;
685 struct net *net = dev_net(dev);
686 __be32 group = pmc ? pmc->multiaddr : 0;
691 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
692 return igmpv3_send_report(in_dev, pmc);
694 if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
697 if (type == IGMP_HOST_LEAVE_MESSAGE)
698 dst = IGMP_ALL_ROUTER;
702 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
704 IPPROTO_IGMP, 0, dev->ifindex);
708 hlen = LL_RESERVED_SPACE(dev);
709 tlen = dev->needed_tailroom;
710 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
715 skb->priority = TC_PRIO_CONTROL;
717 skb_dst_set(skb, &rt->dst);
719 skb_reserve(skb, hlen);
721 skb_reset_network_header(skb);
723 skb_put(skb, sizeof(struct iphdr) + 4);
726 iph->ihl = (sizeof(struct iphdr)+4)>>2;
728 iph->frag_off = htons(IP_DF);
731 iph->saddr = fl4.saddr;
732 iph->protocol = IPPROTO_IGMP;
733 ip_select_ident(net, skb, NULL);
734 ((u8 *)&iph[1])[0] = IPOPT_RA;
735 ((u8 *)&iph[1])[1] = 4;
736 ((u8 *)&iph[1])[2] = 0;
737 ((u8 *)&iph[1])[3] = 0;
739 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
744 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
746 return ip_local_out(net, skb->sk, skb);
749 static void igmp_gq_timer_expire(unsigned long data)
751 struct in_device *in_dev = (struct in_device *)data;
753 in_dev->mr_gq_running = 0;
754 igmpv3_send_report(in_dev, NULL);
758 static void igmp_ifc_timer_expire(unsigned long data)
760 struct in_device *in_dev = (struct in_device *)data;
762 igmpv3_send_cr(in_dev);
763 if (in_dev->mr_ifc_count) {
764 in_dev->mr_ifc_count--;
765 igmp_ifc_start_timer(in_dev,
766 unsolicited_report_interval(in_dev));
771 static void igmp_ifc_event(struct in_device *in_dev)
773 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
775 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv;
776 igmp_ifc_start_timer(in_dev, 1);
780 static void igmp_timer_expire(unsigned long data)
782 struct ip_mc_list *im = (struct ip_mc_list *)data;
783 struct in_device *in_dev = im->interface;
785 spin_lock(&im->lock);
788 if (im->unsolicit_count) {
789 im->unsolicit_count--;
790 igmp_start_timer(im, unsolicited_report_interval(in_dev));
793 spin_unlock(&im->lock);
795 if (IGMP_V1_SEEN(in_dev))
796 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
797 else if (IGMP_V2_SEEN(in_dev))
798 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
800 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
805 /* mark EXCLUDE-mode sources */
806 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
808 struct ip_sf_list *psf;
812 for (psf = pmc->sources; psf; psf = psf->sf_next) {
815 for (i = 0; i < nsrcs; i++) {
816 /* skip inactive filters */
817 if (psf->sf_count[MCAST_INCLUDE] ||
818 pmc->sfcount[MCAST_EXCLUDE] !=
819 psf->sf_count[MCAST_EXCLUDE])
821 if (srcs[i] == psf->sf_inaddr) {
828 if (scount == nsrcs) /* all sources excluded */
833 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
835 struct ip_sf_list *psf;
838 if (pmc->sfmode == MCAST_EXCLUDE)
839 return igmp_xmarksources(pmc, nsrcs, srcs);
841 /* mark INCLUDE-mode sources */
843 for (psf = pmc->sources; psf; psf = psf->sf_next) {
846 for (i = 0; i < nsrcs; i++)
847 if (srcs[i] == psf->sf_inaddr) {
861 /* return true if packet was dropped */
862 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
864 struct ip_mc_list *im;
866 /* Timers are only set for non-local groups */
868 if (group == IGMP_ALL_HOSTS)
870 if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
874 for_each_pmc_rcu(in_dev, im) {
875 if (im->multiaddr == group) {
884 /* return true if packet was dropped */
885 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
888 struct igmphdr *ih = igmp_hdr(skb);
889 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
890 struct ip_mc_list *im;
891 __be32 group = ih->group;
898 /* Alas, old v1 router presents here. */
900 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
901 in_dev->mr_v1_seen = jiffies +
902 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
905 /* v2 router present */
906 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
907 in_dev->mr_v2_seen = jiffies +
908 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
910 /* cancel the interface change timer */
911 in_dev->mr_ifc_count = 0;
912 if (del_timer(&in_dev->mr_ifc_timer))
913 __in_dev_put(in_dev);
914 /* clear deleted report items */
915 igmpv3_clear_delrec(in_dev);
916 } else if (len < 12) {
917 return true; /* ignore bogus packet; freed by caller */
918 } else if (IGMP_V1_SEEN(in_dev)) {
919 /* This is a v3 query with v1 queriers present */
920 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
922 } else if (IGMP_V2_SEEN(in_dev)) {
923 /* this is a v3 query with v2 queriers present;
924 * Interpretation of the max_delay code is problematic here.
925 * A real v2 host would use ih_code directly, while v3 has a
926 * different encoding. We use the v3 encoding as more likely
927 * to be intended in a v3 query.
929 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
931 max_delay = 1; /* can't mod w/ 0 */
933 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
936 ih3 = igmpv3_query_hdr(skb);
938 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
939 + ntohs(ih3->nsrcs)*sizeof(__be32)))
941 ih3 = igmpv3_query_hdr(skb);
944 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
946 max_delay = 1; /* can't mod w/ 0 */
947 in_dev->mr_maxdelay = max_delay;
949 in_dev->mr_qrv = ih3->qrv;
950 if (!group) { /* general query */
952 return true; /* no sources allowed */
953 igmp_gq_start_timer(in_dev);
956 /* mark sources to include, if group & source-specific */
957 mark = ih3->nsrcs != 0;
961 * - Start the timers in all of our membership records
962 * that the query applies to for the interface on
963 * which the query arrived excl. those that belong
964 * to a "local" group (224.0.0.X)
965 * - For timers already running check if they need to
967 * - Use the igmp->igmp_code field as the maximum
971 for_each_pmc_rcu(in_dev, im) {
974 if (group && group != im->multiaddr)
976 if (im->multiaddr == IGMP_ALL_HOSTS)
978 if (ipv4_is_local_multicast(im->multiaddr) &&
979 !sysctl_igmp_llm_reports)
981 spin_lock_bh(&im->lock);
983 im->gsquery = im->gsquery && mark;
986 changed = !im->gsquery ||
987 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
988 spin_unlock_bh(&im->lock);
990 igmp_mod_timer(im, max_delay);
996 /* called in rcu_read_lock() section */
997 int igmp_rcv(struct sk_buff *skb)
999 /* This basically follows the spec line by line -- see RFC1112 */
1001 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
1003 bool dropped = true;
1008 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
1011 if (skb_checksum_simple_validate(skb))
1016 case IGMP_HOST_MEMBERSHIP_QUERY:
1017 dropped = igmp_heard_query(in_dev, skb, len);
1019 case IGMP_HOST_MEMBERSHIP_REPORT:
1020 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1021 /* Is it our report looped back? */
1022 if (rt_is_output_route(skb_rtable(skb)))
1024 /* don't rely on MC router hearing unicast reports */
1025 if (skb->pkt_type == PACKET_MULTICAST ||
1026 skb->pkt_type == PACKET_BROADCAST)
1027 dropped = igmp_heard_report(in_dev, ih->group);
1030 #ifdef CONFIG_IP_PIMSM_V1
1031 return pim_rcv_v1(skb);
1033 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1036 case IGMP_HOST_LEAVE_MESSAGE:
1038 case IGMP_MTRACE_RESP:
1056 * Add a filter to a device
1059 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1061 char buf[MAX_ADDR_LEN];
1062 struct net_device *dev = in_dev->dev;
1064 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1065 We will get multicast token leakage, when IFF_MULTICAST
1066 is changed. This check should be done in ndo_set_rx_mode
1067 routine. Something sort of:
1068 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1071 if (arp_mc_map(addr, buf, dev, 0) == 0)
1072 dev_mc_add(dev, buf);
1076 * Remove a filter from a device
1079 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1081 char buf[MAX_ADDR_LEN];
1082 struct net_device *dev = in_dev->dev;
1084 if (arp_mc_map(addr, buf, dev, 0) == 0)
1085 dev_mc_del(dev, buf);
1088 #ifdef CONFIG_IP_MULTICAST
1090 * deleted ip_mc_list manipulation
1092 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1094 struct ip_mc_list *pmc;
1096 /* this is an "ip_mc_list" for convenience; only the fields below
1097 * are actually used. In particular, the refcnt and users are not
1098 * used for management of the delete list. Using the same structure
1099 * for deleted items allows change reports to use common code with
1100 * non-deleted or query-response MCA's.
1102 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1105 spin_lock_bh(&im->lock);
1106 pmc->interface = im->interface;
1107 in_dev_hold(in_dev);
1108 pmc->multiaddr = im->multiaddr;
1109 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1110 pmc->sfmode = im->sfmode;
1111 if (pmc->sfmode == MCAST_INCLUDE) {
1112 struct ip_sf_list *psf;
1114 pmc->tomb = im->tomb;
1115 pmc->sources = im->sources;
1116 im->tomb = im->sources = NULL;
1117 for (psf = pmc->sources; psf; psf = psf->sf_next)
1118 psf->sf_crcount = pmc->crcount;
1120 spin_unlock_bh(&im->lock);
1122 spin_lock_bh(&in_dev->mc_tomb_lock);
1123 pmc->next = in_dev->mc_tomb;
1124 in_dev->mc_tomb = pmc;
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1128 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1130 struct ip_mc_list *pmc, *pmc_prev;
1131 struct ip_sf_list *psf, *psf_next;
1133 spin_lock_bh(&in_dev->mc_tomb_lock);
1135 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1136 if (pmc->multiaddr == multiaddr)
1142 pmc_prev->next = pmc->next;
1144 in_dev->mc_tomb = pmc->next;
1146 spin_unlock_bh(&in_dev->mc_tomb_lock);
1148 for (psf = pmc->tomb; psf; psf = psf_next) {
1149 psf_next = psf->sf_next;
1152 in_dev_put(pmc->interface);
1157 static void igmpv3_clear_delrec(struct in_device *in_dev)
1159 struct ip_mc_list *pmc, *nextpmc;
1161 spin_lock_bh(&in_dev->mc_tomb_lock);
1162 pmc = in_dev->mc_tomb;
1163 in_dev->mc_tomb = NULL;
1164 spin_unlock_bh(&in_dev->mc_tomb_lock);
1166 for (; pmc; pmc = nextpmc) {
1167 nextpmc = pmc->next;
1168 ip_mc_clear_src(pmc);
1169 in_dev_put(pmc->interface);
1172 /* clear dead sources, too */
1174 for_each_pmc_rcu(in_dev, pmc) {
1175 struct ip_sf_list *psf, *psf_next;
1177 spin_lock_bh(&pmc->lock);
1180 spin_unlock_bh(&pmc->lock);
1181 for (; psf; psf = psf_next) {
1182 psf_next = psf->sf_next;
1190 static void igmp_group_dropped(struct ip_mc_list *im)
1192 struct in_device *in_dev = im->interface;
1193 #ifdef CONFIG_IP_MULTICAST
1199 ip_mc_filter_del(in_dev, im->multiaddr);
1202 #ifdef CONFIG_IP_MULTICAST
1203 if (im->multiaddr == IGMP_ALL_HOSTS)
1205 if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports)
1208 reporter = im->reporter;
1209 igmp_stop_timer(im);
1211 if (!in_dev->dead) {
1212 if (IGMP_V1_SEEN(in_dev))
1214 if (IGMP_V2_SEEN(in_dev)) {
1216 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1220 igmpv3_add_delrec(in_dev, im);
1222 igmp_ifc_event(in_dev);
1227 static void igmp_group_added(struct ip_mc_list *im)
1229 struct in_device *in_dev = im->interface;
1231 if (im->loaded == 0) {
1233 ip_mc_filter_add(in_dev, im->multiaddr);
1236 #ifdef CONFIG_IP_MULTICAST
1237 if (im->multiaddr == IGMP_ALL_HOSTS)
1239 if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports)
1244 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1245 spin_lock_bh(&im->lock);
1246 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1247 spin_unlock_bh(&im->lock);
1252 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1253 igmp_ifc_event(in_dev);
1259 * Multicast list managers
1262 static u32 ip_mc_hash(const struct ip_mc_list *im)
1264 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1267 static void ip_mc_hash_add(struct in_device *in_dev,
1268 struct ip_mc_list *im)
1270 struct ip_mc_list __rcu **mc_hash;
1273 mc_hash = rtnl_dereference(in_dev->mc_hash);
1275 hash = ip_mc_hash(im);
1276 im->next_hash = mc_hash[hash];
1277 rcu_assign_pointer(mc_hash[hash], im);
1281 /* do not use a hash table for small number of items */
1282 if (in_dev->mc_count < 4)
1285 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1290 for_each_pmc_rtnl(in_dev, im) {
1291 hash = ip_mc_hash(im);
1292 im->next_hash = mc_hash[hash];
1293 RCU_INIT_POINTER(mc_hash[hash], im);
1296 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1299 static void ip_mc_hash_remove(struct in_device *in_dev,
1300 struct ip_mc_list *im)
1302 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1303 struct ip_mc_list *aux;
1307 mc_hash += ip_mc_hash(im);
1308 while ((aux = rtnl_dereference(*mc_hash)) != im)
1309 mc_hash = &aux->next_hash;
1310 *mc_hash = im->next_hash;
1315 * A socket has joined a multicast group on device dev.
1318 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1320 struct ip_mc_list *im;
1324 for_each_pmc_rtnl(in_dev, im) {
1325 if (im->multiaddr == addr) {
1327 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1332 im = kzalloc(sizeof(*im), GFP_KERNEL);
1337 im->interface = in_dev;
1338 in_dev_hold(in_dev);
1339 im->multiaddr = addr;
1340 /* initial mode is (EX, empty) */
1341 im->sfmode = MCAST_EXCLUDE;
1342 im->sfcount[MCAST_EXCLUDE] = 1;
1343 atomic_set(&im->refcnt, 1);
1344 spin_lock_init(&im->lock);
1345 #ifdef CONFIG_IP_MULTICAST
1346 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1347 im->unsolicit_count = sysctl_igmp_qrv;
1350 im->next_rcu = in_dev->mc_list;
1352 rcu_assign_pointer(in_dev->mc_list, im);
1354 ip_mc_hash_add(in_dev, im);
1356 #ifdef CONFIG_IP_MULTICAST
1357 igmpv3_del_delrec(in_dev, im->multiaddr);
1359 igmp_group_added(im);
1361 ip_rt_multicast_event(in_dev);
1365 EXPORT_SYMBOL(ip_mc_inc_group);
1367 static int ip_mc_check_iphdr(struct sk_buff *skb)
1369 const struct iphdr *iph;
1371 unsigned int offset = skb_network_offset(skb) + sizeof(*iph);
1373 if (!pskb_may_pull(skb, offset))
1378 if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph))
1381 offset += ip_hdrlen(skb) - sizeof(*iph);
1383 if (!pskb_may_pull(skb, offset))
1388 if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
1391 len = skb_network_offset(skb) + ntohs(iph->tot_len);
1392 if (skb->len < len || len < offset)
1395 skb_set_transport_header(skb, offset);
1400 static int ip_mc_check_igmp_reportv3(struct sk_buff *skb)
1402 unsigned int len = skb_transport_offset(skb);
1404 len += sizeof(struct igmpv3_report);
1406 return pskb_may_pull(skb, len) ? 0 : -EINVAL;
1409 static int ip_mc_check_igmp_query(struct sk_buff *skb)
1411 unsigned int len = skb_transport_offset(skb);
1413 len += sizeof(struct igmphdr);
1418 if (skb->len != len) {
1420 len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr);
1421 if (skb->len < len || !pskb_may_pull(skb, len))
1425 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1426 * all-systems destination addresses (224.0.0.1) for general queries
1428 if (!igmp_hdr(skb)->group &&
1429 ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP))
1435 static int ip_mc_check_igmp_msg(struct sk_buff *skb)
1437 switch (igmp_hdr(skb)->type) {
1438 case IGMP_HOST_LEAVE_MESSAGE:
1439 case IGMP_HOST_MEMBERSHIP_REPORT:
1440 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1443 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1444 return ip_mc_check_igmp_reportv3(skb);
1445 case IGMP_HOST_MEMBERSHIP_QUERY:
1446 return ip_mc_check_igmp_query(skb);
1452 static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb)
1454 return skb_checksum_simple_validate(skb);
1457 static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1460 struct sk_buff *skb_chk;
1461 unsigned int transport_len;
1462 unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr);
1465 transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb);
1467 skb_chk = skb_checksum_trimmed(skb, transport_len,
1468 ip_mc_validate_checksum);
1472 if (!pskb_may_pull(skb_chk, len))
1475 ret = ip_mc_check_igmp_msg(skb_chk);
1480 *skb_trimmed = skb_chk;
1481 /* free now unneeded clone */
1482 else if (skb_chk != skb)
1488 if (ret && skb_chk && skb_chk != skb)
1495 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1496 * @skb: the skb to validate
1497 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1499 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1500 * skb transport header accordingly and returns zero.
1502 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1504 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1505 * -ENOMEM: A memory allocation failure happened.
1507 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1508 * to NULL): After parsing an IGMP packet successfully it will point to
1509 * an skb which has its tail aligned to the IP packet end. This might
1510 * either be the originally provided skb or a trimmed, cloned version if
1511 * the skb frame had data beyond the IP packet. A cloned skb allows us
1512 * to leave the original skb and its full frame unchanged (which might be
1513 * desirable for layer 2 frame jugglers).
1515 * Caller needs to set the skb network header and free any returned skb if it
1516 * differs from the provided skb.
1518 int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed)
1520 int ret = ip_mc_check_iphdr(skb);
1525 if (ip_hdr(skb)->protocol != IPPROTO_IGMP)
1528 return __ip_mc_check_igmp(skb, skb_trimmed);
1530 EXPORT_SYMBOL(ip_mc_check_igmp);
1533 * Resend IGMP JOIN report; used by netdev notifier.
1535 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1537 #ifdef CONFIG_IP_MULTICAST
1538 struct ip_mc_list *im;
1543 for_each_pmc_rtnl(in_dev, im) {
1544 if (im->multiaddr == IGMP_ALL_HOSTS)
1546 if (ipv4_is_local_multicast(im->multiaddr) &&
1547 !sysctl_igmp_llm_reports)
1550 /* a failover is happening and switches
1551 * must be notified immediately
1553 if (IGMP_V1_SEEN(in_dev))
1554 type = IGMP_HOST_MEMBERSHIP_REPORT;
1555 else if (IGMP_V2_SEEN(in_dev))
1556 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1558 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1559 igmp_send_report(in_dev, im, type);
1565 * A socket has left a multicast group on device dev
1568 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1570 struct ip_mc_list *i;
1571 struct ip_mc_list __rcu **ip;
1575 for (ip = &in_dev->mc_list;
1576 (i = rtnl_dereference(*ip)) != NULL;
1577 ip = &i->next_rcu) {
1578 if (i->multiaddr == addr) {
1579 if (--i->users == 0) {
1580 ip_mc_hash_remove(in_dev, i);
1583 igmp_group_dropped(i);
1587 ip_rt_multicast_event(in_dev);
1596 EXPORT_SYMBOL(ip_mc_dec_group);
1598 /* Device changing type */
1600 void ip_mc_unmap(struct in_device *in_dev)
1602 struct ip_mc_list *pmc;
1606 for_each_pmc_rtnl(in_dev, pmc)
1607 igmp_group_dropped(pmc);
1610 void ip_mc_remap(struct in_device *in_dev)
1612 struct ip_mc_list *pmc;
1616 for_each_pmc_rtnl(in_dev, pmc)
1617 igmp_group_added(pmc);
1620 /* Device going down */
1622 void ip_mc_down(struct in_device *in_dev)
1624 struct ip_mc_list *pmc;
1628 for_each_pmc_rtnl(in_dev, pmc)
1629 igmp_group_dropped(pmc);
1631 #ifdef CONFIG_IP_MULTICAST
1632 in_dev->mr_ifc_count = 0;
1633 if (del_timer(&in_dev->mr_ifc_timer))
1634 __in_dev_put(in_dev);
1635 in_dev->mr_gq_running = 0;
1636 if (del_timer(&in_dev->mr_gq_timer))
1637 __in_dev_put(in_dev);
1638 igmpv3_clear_delrec(in_dev);
1641 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1644 void ip_mc_init_dev(struct in_device *in_dev)
1648 #ifdef CONFIG_IP_MULTICAST
1649 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1650 (unsigned long)in_dev);
1651 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1652 (unsigned long)in_dev);
1653 in_dev->mr_qrv = sysctl_igmp_qrv;
1656 spin_lock_init(&in_dev->mc_tomb_lock);
1659 /* Device going up */
1661 void ip_mc_up(struct in_device *in_dev)
1663 struct ip_mc_list *pmc;
1667 #ifdef CONFIG_IP_MULTICAST
1668 in_dev->mr_qrv = sysctl_igmp_qrv;
1670 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1672 for_each_pmc_rtnl(in_dev, pmc)
1673 igmp_group_added(pmc);
1677 * Device is about to be destroyed: clean up.
1680 void ip_mc_destroy_dev(struct in_device *in_dev)
1682 struct ip_mc_list *i;
1686 /* Deactivate timers */
1689 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1690 in_dev->mc_list = i->next_rcu;
1693 /* We've dropped the groups in ip_mc_down already */
1699 /* RTNL is locked */
1700 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1702 struct net_device *dev = NULL;
1703 struct in_device *idev = NULL;
1705 if (imr->imr_ifindex) {
1706 idev = inetdev_by_index(net, imr->imr_ifindex);
1709 if (imr->imr_address.s_addr) {
1710 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1716 struct rtable *rt = ip_route_output(net,
1717 imr->imr_multiaddr.s_addr,
1725 imr->imr_ifindex = dev->ifindex;
1726 idev = __in_dev_get_rtnl(dev);
1732 * Join a socket to a group
1734 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1735 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1736 #ifdef CONFIG_IP_MULTICAST
1737 int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE;
1740 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1743 struct ip_sf_list *psf, *psf_prev;
1747 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1748 if (psf->sf_inaddr == *psfsrc)
1752 if (!psf || psf->sf_count[sfmode] == 0) {
1753 /* source filter not found, or count wrong => bug */
1756 psf->sf_count[sfmode]--;
1757 if (psf->sf_count[sfmode] == 0) {
1758 ip_rt_multicast_event(pmc->interface);
1760 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1761 #ifdef CONFIG_IP_MULTICAST
1762 struct in_device *in_dev = pmc->interface;
1765 /* no more filters for this source */
1767 psf_prev->sf_next = psf->sf_next;
1769 pmc->sources = psf->sf_next;
1770 #ifdef CONFIG_IP_MULTICAST
1771 if (psf->sf_oldin &&
1772 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1773 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1774 psf->sf_next = pmc->tomb;
1784 #ifndef CONFIG_IP_MULTICAST
1785 #define igmp_ifc_event(x) do { } while (0)
1788 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1789 int sfcount, __be32 *psfsrc, int delta)
1791 struct ip_mc_list *pmc;
1798 for_each_pmc_rcu(in_dev, pmc) {
1799 if (*pmca == pmc->multiaddr)
1803 /* MCA not found?? bug */
1807 spin_lock_bh(&pmc->lock);
1809 #ifdef CONFIG_IP_MULTICAST
1814 if (!pmc->sfcount[sfmode])
1816 pmc->sfcount[sfmode]--;
1819 for (i = 0; i < sfcount; i++) {
1820 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1822 changerec |= rv > 0;
1826 if (pmc->sfmode == MCAST_EXCLUDE &&
1827 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1828 pmc->sfcount[MCAST_INCLUDE]) {
1829 #ifdef CONFIG_IP_MULTICAST
1830 struct ip_sf_list *psf;
1833 /* filter mode change */
1834 pmc->sfmode = MCAST_INCLUDE;
1835 #ifdef CONFIG_IP_MULTICAST
1836 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1837 in_dev->mr_ifc_count = pmc->crcount;
1838 for (psf = pmc->sources; psf; psf = psf->sf_next)
1839 psf->sf_crcount = 0;
1840 igmp_ifc_event(pmc->interface);
1841 } else if (sf_setstate(pmc) || changerec) {
1842 igmp_ifc_event(pmc->interface);
1846 spin_unlock_bh(&pmc->lock);
1851 * Add multicast single-source filter to the interface list
1853 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1856 struct ip_sf_list *psf, *psf_prev;
1859 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1860 if (psf->sf_inaddr == *psfsrc)
1865 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1868 psf->sf_inaddr = *psfsrc;
1870 psf_prev->sf_next = psf;
1874 psf->sf_count[sfmode]++;
1875 if (psf->sf_count[sfmode] == 1) {
1876 ip_rt_multicast_event(pmc->interface);
1881 #ifdef CONFIG_IP_MULTICAST
1882 static void sf_markstate(struct ip_mc_list *pmc)
1884 struct ip_sf_list *psf;
1885 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1887 for (psf = pmc->sources; psf; psf = psf->sf_next)
1888 if (pmc->sfcount[MCAST_EXCLUDE]) {
1889 psf->sf_oldin = mca_xcount ==
1890 psf->sf_count[MCAST_EXCLUDE] &&
1891 !psf->sf_count[MCAST_INCLUDE];
1893 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1896 static int sf_setstate(struct ip_mc_list *pmc)
1898 struct ip_sf_list *psf, *dpsf;
1899 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1900 int qrv = pmc->interface->mr_qrv;
1904 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1905 if (pmc->sfcount[MCAST_EXCLUDE]) {
1906 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1907 !psf->sf_count[MCAST_INCLUDE];
1909 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1911 if (!psf->sf_oldin) {
1912 struct ip_sf_list *prev = NULL;
1914 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1915 if (dpsf->sf_inaddr == psf->sf_inaddr)
1921 prev->sf_next = dpsf->sf_next;
1923 pmc->tomb = dpsf->sf_next;
1926 psf->sf_crcount = qrv;
1929 } else if (psf->sf_oldin) {
1931 psf->sf_crcount = 0;
1933 * add or update "delete" records if an active filter
1936 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1937 if (dpsf->sf_inaddr == psf->sf_inaddr)
1940 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1944 /* pmc->lock held by callers */
1945 dpsf->sf_next = pmc->tomb;
1948 dpsf->sf_crcount = qrv;
1957 * Add multicast source filter list to the interface list
1959 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1960 int sfcount, __be32 *psfsrc, int delta)
1962 struct ip_mc_list *pmc;
1969 for_each_pmc_rcu(in_dev, pmc) {
1970 if (*pmca == pmc->multiaddr)
1974 /* MCA not found?? bug */
1978 spin_lock_bh(&pmc->lock);
1981 #ifdef CONFIG_IP_MULTICAST
1984 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1986 pmc->sfcount[sfmode]++;
1988 for (i = 0; i < sfcount; i++) {
1989 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1997 pmc->sfcount[sfmode]--;
1998 for (j = 0; j < i; j++)
1999 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2000 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
2001 #ifdef CONFIG_IP_MULTICAST
2002 struct ip_sf_list *psf;
2003 in_dev = pmc->interface;
2006 /* filter mode change */
2007 if (pmc->sfcount[MCAST_EXCLUDE])
2008 pmc->sfmode = MCAST_EXCLUDE;
2009 else if (pmc->sfcount[MCAST_INCLUDE])
2010 pmc->sfmode = MCAST_INCLUDE;
2011 #ifdef CONFIG_IP_MULTICAST
2012 /* else no filters; keep old mode for reports */
2014 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
2015 in_dev->mr_ifc_count = pmc->crcount;
2016 for (psf = pmc->sources; psf; psf = psf->sf_next)
2017 psf->sf_crcount = 0;
2018 igmp_ifc_event(in_dev);
2019 } else if (sf_setstate(pmc)) {
2020 igmp_ifc_event(in_dev);
2023 spin_unlock_bh(&pmc->lock);
2027 static void ip_mc_clear_src(struct ip_mc_list *pmc)
2029 struct ip_sf_list *psf, *nextpsf;
2031 for (psf = pmc->tomb; psf; psf = nextpsf) {
2032 nextpsf = psf->sf_next;
2036 for (psf = pmc->sources; psf; psf = nextpsf) {
2037 nextpsf = psf->sf_next;
2040 pmc->sources = NULL;
2041 pmc->sfmode = MCAST_EXCLUDE;
2042 pmc->sfcount[MCAST_INCLUDE] = 0;
2043 pmc->sfcount[MCAST_EXCLUDE] = 1;
2046 /* Join a multicast group
2049 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
2051 __be32 addr = imr->imr_multiaddr.s_addr;
2052 struct ip_mc_socklist *iml, *i;
2053 struct in_device *in_dev;
2054 struct inet_sock *inet = inet_sk(sk);
2055 struct net *net = sock_net(sk);
2062 if (!ipv4_is_multicast(addr))
2065 in_dev = ip_mc_find_dev(net, imr);
2073 ifindex = imr->imr_ifindex;
2074 for_each_pmc_rtnl(inet, i) {
2075 if (i->multi.imr_multiaddr.s_addr == addr &&
2076 i->multi.imr_ifindex == ifindex)
2081 if (count >= sysctl_igmp_max_memberships)
2083 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
2087 memcpy(&iml->multi, imr, sizeof(*imr));
2088 iml->next_rcu = inet->mc_list;
2090 iml->sfmode = MCAST_EXCLUDE;
2091 rcu_assign_pointer(inet->mc_list, iml);
2092 ip_mc_inc_group(in_dev, addr);
2097 EXPORT_SYMBOL(ip_mc_join_group);
2099 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
2100 struct in_device *in_dev)
2102 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
2106 /* any-source empty exclude case */
2107 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2108 iml->sfmode, 0, NULL, 0);
2110 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
2111 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
2112 RCU_INIT_POINTER(iml->sflist, NULL);
2113 /* decrease mem now to avoid the memleak warning */
2114 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
2115 kfree_rcu(psf, rcu);
2119 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
2121 struct inet_sock *inet = inet_sk(sk);
2122 struct ip_mc_socklist *iml;
2123 struct ip_mc_socklist __rcu **imlp;
2124 struct in_device *in_dev;
2125 struct net *net = sock_net(sk);
2126 __be32 group = imr->imr_multiaddr.s_addr;
2128 int ret = -EADDRNOTAVAIL;
2132 in_dev = ip_mc_find_dev(net, imr);
2133 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
2137 ifindex = imr->imr_ifindex;
2138 for (imlp = &inet->mc_list;
2139 (iml = rtnl_dereference(*imlp)) != NULL;
2140 imlp = &iml->next_rcu) {
2141 if (iml->multi.imr_multiaddr.s_addr != group)
2144 if (iml->multi.imr_ifindex != ifindex)
2146 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
2147 iml->multi.imr_address.s_addr)
2150 (void) ip_mc_leave_src(sk, iml, in_dev);
2152 *imlp = iml->next_rcu;
2155 ip_mc_dec_group(in_dev, group);
2157 /* decrease mem now to avoid the memleak warning */
2158 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2159 kfree_rcu(iml, rcu);
2165 EXPORT_SYMBOL(ip_mc_leave_group);
2167 int ip_mc_source(int add, int omode, struct sock *sk, struct
2168 ip_mreq_source *mreqs, int ifindex)
2171 struct ip_mreqn imr;
2172 __be32 addr = mreqs->imr_multiaddr;
2173 struct ip_mc_socklist *pmc;
2174 struct in_device *in_dev = NULL;
2175 struct inet_sock *inet = inet_sk(sk);
2176 struct ip_sf_socklist *psl;
2177 struct net *net = sock_net(sk);
2181 if (!ipv4_is_multicast(addr))
2186 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2187 imr.imr_address.s_addr = mreqs->imr_interface;
2188 imr.imr_ifindex = ifindex;
2189 in_dev = ip_mc_find_dev(net, &imr);
2195 err = -EADDRNOTAVAIL;
2197 for_each_pmc_rtnl(inet, pmc) {
2198 if ((pmc->multi.imr_multiaddr.s_addr ==
2199 imr.imr_multiaddr.s_addr) &&
2200 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2203 if (!pmc) { /* must have a prior join */
2207 /* if a source filter was set, must be the same mode as before */
2209 if (pmc->sfmode != omode) {
2213 } else if (pmc->sfmode != omode) {
2214 /* allow mode switches for empty-set filters */
2215 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2216 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2218 pmc->sfmode = omode;
2221 psl = rtnl_dereference(pmc->sflist);
2224 goto done; /* err = -EADDRNOTAVAIL */
2226 for (i = 0; i < psl->sl_count; i++) {
2227 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2232 if (rv) /* source not found */
2233 goto done; /* err = -EADDRNOTAVAIL */
2235 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2236 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2241 /* update the interface filter */
2242 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2243 &mreqs->imr_sourceaddr, 1);
2245 for (j = i+1; j < psl->sl_count; j++)
2246 psl->sl_addr[j-1] = psl->sl_addr[j];
2251 /* else, add a new source to the filter */
2253 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2257 if (!psl || psl->sl_count == psl->sl_max) {
2258 struct ip_sf_socklist *newpsl;
2259 int count = IP_SFBLOCK;
2262 count += psl->sl_max;
2263 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2268 newpsl->sl_max = count;
2269 newpsl->sl_count = count - IP_SFBLOCK;
2271 for (i = 0; i < psl->sl_count; i++)
2272 newpsl->sl_addr[i] = psl->sl_addr[i];
2273 /* decrease mem now to avoid the memleak warning */
2274 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2275 kfree_rcu(psl, rcu);
2277 rcu_assign_pointer(pmc->sflist, newpsl);
2280 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2281 for (i = 0; i < psl->sl_count; i++) {
2282 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2287 if (rv == 0) /* address already there is an error */
2289 for (j = psl->sl_count-1; j >= i; j--)
2290 psl->sl_addr[j+1] = psl->sl_addr[j];
2291 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2294 /* update the interface list */
2295 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2296 &mreqs->imr_sourceaddr, 1);
2299 err = ip_mc_leave_group(sk, &imr);
2303 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2306 struct ip_mreqn imr;
2307 __be32 addr = msf->imsf_multiaddr;
2308 struct ip_mc_socklist *pmc;
2309 struct in_device *in_dev;
2310 struct inet_sock *inet = inet_sk(sk);
2311 struct ip_sf_socklist *newpsl, *psl;
2312 struct net *net = sock_net(sk);
2315 if (!ipv4_is_multicast(addr))
2317 if (msf->imsf_fmode != MCAST_INCLUDE &&
2318 msf->imsf_fmode != MCAST_EXCLUDE)
2323 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2324 imr.imr_address.s_addr = msf->imsf_interface;
2325 imr.imr_ifindex = ifindex;
2326 in_dev = ip_mc_find_dev(net, &imr);
2333 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2334 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2339 for_each_pmc_rtnl(inet, pmc) {
2340 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2341 pmc->multi.imr_ifindex == imr.imr_ifindex)
2344 if (!pmc) { /* must have a prior join */
2348 if (msf->imsf_numsrc) {
2349 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2355 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2356 memcpy(newpsl->sl_addr, msf->imsf_slist,
2357 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2358 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2359 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2361 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2366 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2367 msf->imsf_fmode, 0, NULL, 0);
2369 psl = rtnl_dereference(pmc->sflist);
2371 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2372 psl->sl_count, psl->sl_addr, 0);
2373 /* decrease mem now to avoid the memleak warning */
2374 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2375 kfree_rcu(psl, rcu);
2377 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2379 rcu_assign_pointer(pmc->sflist, newpsl);
2380 pmc->sfmode = msf->imsf_fmode;
2384 err = ip_mc_leave_group(sk, &imr);
2388 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2389 struct ip_msfilter __user *optval, int __user *optlen)
2391 int err, len, count, copycount;
2392 struct ip_mreqn imr;
2393 __be32 addr = msf->imsf_multiaddr;
2394 struct ip_mc_socklist *pmc;
2395 struct in_device *in_dev;
2396 struct inet_sock *inet = inet_sk(sk);
2397 struct ip_sf_socklist *psl;
2398 struct net *net = sock_net(sk);
2402 if (!ipv4_is_multicast(addr))
2405 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2406 imr.imr_address.s_addr = msf->imsf_interface;
2407 imr.imr_ifindex = 0;
2408 in_dev = ip_mc_find_dev(net, &imr);
2414 err = -EADDRNOTAVAIL;
2416 for_each_pmc_rtnl(inet, pmc) {
2417 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2418 pmc->multi.imr_ifindex == imr.imr_ifindex)
2421 if (!pmc) /* must have a prior join */
2423 msf->imsf_fmode = pmc->sfmode;
2424 psl = rtnl_dereference(pmc->sflist);
2429 count = psl->sl_count;
2431 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2432 len = copycount * sizeof(psl->sl_addr[0]);
2433 msf->imsf_numsrc = count;
2434 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2435 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2439 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2446 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2447 struct group_filter __user *optval, int __user *optlen)
2449 int err, i, count, copycount;
2450 struct sockaddr_in *psin;
2452 struct ip_mc_socklist *pmc;
2453 struct inet_sock *inet = inet_sk(sk);
2454 struct ip_sf_socklist *psl;
2458 psin = (struct sockaddr_in *)&gsf->gf_group;
2459 if (psin->sin_family != AF_INET)
2461 addr = psin->sin_addr.s_addr;
2462 if (!ipv4_is_multicast(addr))
2465 err = -EADDRNOTAVAIL;
2467 for_each_pmc_rtnl(inet, pmc) {
2468 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2469 pmc->multi.imr_ifindex == gsf->gf_interface)
2472 if (!pmc) /* must have a prior join */
2474 gsf->gf_fmode = pmc->sfmode;
2475 psl = rtnl_dereference(pmc->sflist);
2476 count = psl ? psl->sl_count : 0;
2477 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2478 gsf->gf_numsrc = count;
2479 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2480 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2483 for (i = 0; i < copycount; i++) {
2484 struct sockaddr_storage ss;
2486 psin = (struct sockaddr_in *)&ss;
2487 memset(&ss, 0, sizeof(ss));
2488 psin->sin_family = AF_INET;
2489 psin->sin_addr.s_addr = psl->sl_addr[i];
2490 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2499 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2501 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2503 struct inet_sock *inet = inet_sk(sk);
2504 struct ip_mc_socklist *pmc;
2505 struct ip_sf_socklist *psl;
2510 if (!ipv4_is_multicast(loc_addr))
2514 for_each_pmc_rcu(inet, pmc) {
2515 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2516 pmc->multi.imr_ifindex == dif)
2522 psl = rcu_dereference(pmc->sflist);
2523 ret = (pmc->sfmode == MCAST_EXCLUDE);
2527 for (i = 0; i < psl->sl_count; i++) {
2528 if (psl->sl_addr[i] == rmt_addr)
2532 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2534 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2544 * A socket is closing.
2547 void ip_mc_drop_socket(struct sock *sk)
2549 struct inet_sock *inet = inet_sk(sk);
2550 struct ip_mc_socklist *iml;
2551 struct net *net = sock_net(sk);
2557 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2558 struct in_device *in_dev;
2560 inet->mc_list = iml->next_rcu;
2561 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2562 (void) ip_mc_leave_src(sk, iml, in_dev);
2564 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2565 /* decrease mem now to avoid the memleak warning */
2566 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2567 kfree_rcu(iml, rcu);
2572 /* called with rcu_read_lock() */
2573 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto)
2575 struct ip_mc_list *im;
2576 struct ip_mc_list __rcu **mc_hash;
2577 struct ip_sf_list *psf;
2580 mc_hash = rcu_dereference(in_dev->mc_hash);
2582 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2584 for (im = rcu_dereference(mc_hash[hash]);
2586 im = rcu_dereference(im->next_hash)) {
2587 if (im->multiaddr == mc_addr)
2591 for_each_pmc_rcu(in_dev, im) {
2592 if (im->multiaddr == mc_addr)
2596 if (im && proto == IPPROTO_IGMP) {
2600 for (psf = im->sources; psf; psf = psf->sf_next) {
2601 if (psf->sf_inaddr == src_addr)
2605 rv = psf->sf_count[MCAST_INCLUDE] ||
2606 psf->sf_count[MCAST_EXCLUDE] !=
2607 im->sfcount[MCAST_EXCLUDE];
2609 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2611 rv = 1; /* unspecified source; tentatively allow */
2616 #if defined(CONFIG_PROC_FS)
2617 struct igmp_mc_iter_state {
2618 struct seq_net_private p;
2619 struct net_device *dev;
2620 struct in_device *in_dev;
2623 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2625 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2627 struct net *net = seq_file_net(seq);
2628 struct ip_mc_list *im = NULL;
2629 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2631 state->in_dev = NULL;
2632 for_each_netdev_rcu(net, state->dev) {
2633 struct in_device *in_dev;
2635 in_dev = __in_dev_get_rcu(state->dev);
2638 im = rcu_dereference(in_dev->mc_list);
2640 state->in_dev = in_dev;
2647 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2649 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2651 im = rcu_dereference(im->next_rcu);
2653 state->dev = next_net_device_rcu(state->dev);
2655 state->in_dev = NULL;
2658 state->in_dev = __in_dev_get_rcu(state->dev);
2661 im = rcu_dereference(state->in_dev->mc_list);
2666 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2668 struct ip_mc_list *im = igmp_mc_get_first(seq);
2670 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2672 return pos ? NULL : im;
2675 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2679 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2682 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2684 struct ip_mc_list *im;
2685 if (v == SEQ_START_TOKEN)
2686 im = igmp_mc_get_first(seq);
2688 im = igmp_mc_get_next(seq, v);
2693 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2696 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2698 state->in_dev = NULL;
2703 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2705 if (v == SEQ_START_TOKEN)
2707 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2709 struct ip_mc_list *im = (struct ip_mc_list *)v;
2710 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2714 #ifdef CONFIG_IP_MULTICAST
2715 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2716 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2722 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2723 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2724 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2727 delta = im->timer.expires - jiffies;
2729 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2730 im->multiaddr, im->users,
2732 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2738 static const struct seq_operations igmp_mc_seq_ops = {
2739 .start = igmp_mc_seq_start,
2740 .next = igmp_mc_seq_next,
2741 .stop = igmp_mc_seq_stop,
2742 .show = igmp_mc_seq_show,
2745 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2747 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2748 sizeof(struct igmp_mc_iter_state));
2751 static const struct file_operations igmp_mc_seq_fops = {
2752 .owner = THIS_MODULE,
2753 .open = igmp_mc_seq_open,
2755 .llseek = seq_lseek,
2756 .release = seq_release_net,
2759 struct igmp_mcf_iter_state {
2760 struct seq_net_private p;
2761 struct net_device *dev;
2762 struct in_device *idev;
2763 struct ip_mc_list *im;
2766 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2768 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2770 struct net *net = seq_file_net(seq);
2771 struct ip_sf_list *psf = NULL;
2772 struct ip_mc_list *im = NULL;
2773 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2777 for_each_netdev_rcu(net, state->dev) {
2778 struct in_device *idev;
2779 idev = __in_dev_get_rcu(state->dev);
2780 if (unlikely(!idev))
2782 im = rcu_dereference(idev->mc_list);
2784 spin_lock_bh(&im->lock);
2791 spin_unlock_bh(&im->lock);
2797 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2799 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2803 spin_unlock_bh(&state->im->lock);
2804 state->im = state->im->next;
2805 while (!state->im) {
2806 state->dev = next_net_device_rcu(state->dev);
2811 state->idev = __in_dev_get_rcu(state->dev);
2814 state->im = rcu_dereference(state->idev->mc_list);
2818 spin_lock_bh(&state->im->lock);
2819 psf = state->im->sources;
2825 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2827 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2829 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2831 return pos ? NULL : psf;
2834 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2838 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2841 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2843 struct ip_sf_list *psf;
2844 if (v == SEQ_START_TOKEN)
2845 psf = igmp_mcf_get_first(seq);
2847 psf = igmp_mcf_get_next(seq, v);
2852 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2855 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2856 if (likely(state->im)) {
2857 spin_unlock_bh(&state->im->lock);
2865 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2867 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2868 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2870 if (v == SEQ_START_TOKEN) {
2871 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2875 "0x%08x %6lu %6lu\n",
2876 state->dev->ifindex, state->dev->name,
2877 ntohl(state->im->multiaddr),
2878 ntohl(psf->sf_inaddr),
2879 psf->sf_count[MCAST_INCLUDE],
2880 psf->sf_count[MCAST_EXCLUDE]);
2885 static const struct seq_operations igmp_mcf_seq_ops = {
2886 .start = igmp_mcf_seq_start,
2887 .next = igmp_mcf_seq_next,
2888 .stop = igmp_mcf_seq_stop,
2889 .show = igmp_mcf_seq_show,
2892 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2894 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2895 sizeof(struct igmp_mcf_iter_state));
2898 static const struct file_operations igmp_mcf_seq_fops = {
2899 .owner = THIS_MODULE,
2900 .open = igmp_mcf_seq_open,
2902 .llseek = seq_lseek,
2903 .release = seq_release_net,
2906 static int __net_init igmp_net_init(struct net *net)
2908 struct proc_dir_entry *pde;
2911 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2914 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2915 &igmp_mcf_seq_fops);
2918 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2919 SOCK_DGRAM, 0, net);
2921 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2929 remove_proc_entry("mcfilter", net->proc_net);
2931 remove_proc_entry("igmp", net->proc_net);
2936 static void __net_exit igmp_net_exit(struct net *net)
2938 remove_proc_entry("mcfilter", net->proc_net);
2939 remove_proc_entry("igmp", net->proc_net);
2940 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2943 static struct pernet_operations igmp_net_ops = {
2944 .init = igmp_net_init,
2945 .exit = igmp_net_exit,
2949 static int igmp_netdev_event(struct notifier_block *this,
2950 unsigned long event, void *ptr)
2952 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2953 struct in_device *in_dev;
2956 case NETDEV_RESEND_IGMP:
2957 in_dev = __in_dev_get_rtnl(dev);
2959 ip_mc_rejoin_groups(in_dev);
2967 static struct notifier_block igmp_notifier = {
2968 .notifier_call = igmp_netdev_event,
2971 int __init igmp_mc_init(void)
2973 #if defined(CONFIG_PROC_FS)
2976 err = register_pernet_subsys(&igmp_net_ops);
2979 err = register_netdevice_notifier(&igmp_notifier);
2981 goto reg_notif_fail;
2985 unregister_pernet_subsys(&igmp_net_ops);
2988 return register_netdevice_notifier(&igmp_notifier);