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 #ifdef CONFIG_IP_MULTICAST
114 /* Parameter names and values are taken from igmp-v2-06 draft */
116 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
117 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
118 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
119 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
120 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
121 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
124 #define IGMP_INITIAL_REPORT_DELAY (1)
126 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
127 * IGMP specs require to report membership immediately after
128 * joining a group, but we delay the first report by a
129 * small interval. It seems more natural and still does not
130 * contradict to specs provided this delay is small enough.
133 #define IGMP_V1_SEEN(in_dev) \
134 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
135 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
136 ((in_dev)->mr_v1_seen && \
137 time_before(jiffies, (in_dev)->mr_v1_seen)))
138 #define IGMP_V2_SEEN(in_dev) \
139 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
140 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
141 ((in_dev)->mr_v2_seen && \
142 time_before(jiffies, (in_dev)->mr_v2_seen)))
144 static int unsolicited_report_interval(struct in_device *in_dev)
146 int interval_ms, interval_jiffies;
148 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
149 interval_ms = IN_DEV_CONF_GET(
151 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
153 interval_ms = IN_DEV_CONF_GET(
155 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
157 interval_jiffies = msecs_to_jiffies(interval_ms);
159 /* _timer functions can't handle a delay of 0 jiffies so ensure
160 * we always return a positive value.
162 if (interval_jiffies <= 0)
163 interval_jiffies = 1;
164 return interval_jiffies;
167 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
168 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
169 static void igmpv3_clear_delrec(struct in_device *in_dev);
170 static int sf_setstate(struct ip_mc_list *pmc);
171 static void sf_markstate(struct ip_mc_list *pmc);
173 static void ip_mc_clear_src(struct ip_mc_list *pmc);
174 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
175 int sfcount, __be32 *psfsrc, int delta);
177 static void ip_ma_put(struct ip_mc_list *im)
179 if (atomic_dec_and_test(&im->refcnt)) {
180 in_dev_put(im->interface);
185 #define for_each_pmc_rcu(in_dev, pmc) \
186 for (pmc = rcu_dereference(in_dev->mc_list); \
188 pmc = rcu_dereference(pmc->next_rcu))
190 #define for_each_pmc_rtnl(in_dev, pmc) \
191 for (pmc = rtnl_dereference(in_dev->mc_list); \
193 pmc = rtnl_dereference(pmc->next_rcu))
195 #ifdef CONFIG_IP_MULTICAST
201 static void igmp_stop_timer(struct ip_mc_list *im)
203 spin_lock_bh(&im->lock);
204 if (del_timer(&im->timer))
205 atomic_dec(&im->refcnt);
208 im->unsolicit_count = 0;
209 spin_unlock_bh(&im->lock);
212 /* It must be called with locked im->lock */
213 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
215 int tv = prandom_u32() % max_delay;
218 if (!mod_timer(&im->timer, jiffies+tv+2))
219 atomic_inc(&im->refcnt);
222 static void igmp_gq_start_timer(struct in_device *in_dev)
224 int tv = prandom_u32() % in_dev->mr_maxdelay;
226 in_dev->mr_gq_running = 1;
227 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
231 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
233 int tv = prandom_u32() % delay;
235 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
239 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
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);
247 spin_unlock_bh(&im->lock);
250 atomic_dec(&im->refcnt);
252 igmp_start_timer(im, max_delay);
253 spin_unlock_bh(&im->lock);
258 * Send an IGMP report.
261 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
264 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
265 int gdeleted, int sdeleted)
268 case IGMPV3_MODE_IS_INCLUDE:
269 case IGMPV3_MODE_IS_EXCLUDE:
270 if (gdeleted || sdeleted)
272 if (!(pmc->gsquery && !psf->sf_gsresp)) {
273 if (pmc->sfmode == MCAST_INCLUDE)
275 /* don't include if this source is excluded
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];
284 case IGMPV3_CHANGE_TO_INCLUDE:
285 if (gdeleted || sdeleted)
287 return psf->sf_count[MCAST_INCLUDE] != 0;
288 case IGMPV3_CHANGE_TO_EXCLUDE:
289 if (gdeleted || sdeleted)
291 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
292 psf->sf_count[MCAST_INCLUDE])
294 return pmc->sfcount[MCAST_EXCLUDE] ==
295 psf->sf_count[MCAST_EXCLUDE];
296 case IGMPV3_ALLOW_NEW_SOURCES:
297 if (gdeleted || !psf->sf_crcount)
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;
309 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
311 struct ip_sf_list *psf;
314 for (psf = pmc->sources; psf; psf = psf->sf_next) {
315 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
322 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
327 struct igmpv3_report *pig;
328 struct net *net = dev_net(dev);
330 int hlen = LL_RESERVED_SPACE(dev);
331 int tlen = dev->needed_tailroom;
332 unsigned int size = mtu;
335 skb = alloc_skb(size + hlen + tlen,
336 GFP_ATOMIC | __GFP_NOWARN);
343 skb->priority = TC_PRIO_CONTROL;
345 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
347 IPPROTO_IGMP, 0, dev->ifindex);
353 skb_dst_set(skb, &rt->dst);
356 skb->reserved_tailroom = skb_end_offset(skb) -
357 min(mtu, skb_end_offset(skb));
358 skb_reserve(skb, hlen);
360 skb_reset_network_header(skb);
362 skb_put(skb, sizeof(struct iphdr) + 4);
365 pip->ihl = (sizeof(struct iphdr)+4)>>2;
367 pip->frag_off = htons(IP_DF);
369 pip->daddr = fl4.daddr;
370 pip->saddr = fl4.saddr;
371 pip->protocol = IPPROTO_IGMP;
372 pip->tot_len = 0; /* filled in later */
373 ip_select_ident(skb, NULL);
374 ((u8 *)&pip[1])[0] = IPOPT_RA;
375 ((u8 *)&pip[1])[1] = 4;
376 ((u8 *)&pip[1])[2] = 0;
377 ((u8 *)&pip[1])[3] = 0;
379 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
380 skb_put(skb, sizeof(*pig));
381 pig = igmpv3_report_hdr(skb);
382 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
390 static int igmpv3_sendpack(struct sk_buff *skb)
392 struct igmphdr *pig = igmp_hdr(skb);
393 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
395 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
397 return ip_local_out(skb);
400 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
402 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
405 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
406 int type, struct igmpv3_grec **ppgr)
408 struct net_device *dev = pmc->interface->dev;
409 struct igmpv3_report *pih;
410 struct igmpv3_grec *pgr;
413 skb = igmpv3_newpack(dev, dev->mtu);
416 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
417 pgr->grec_type = type;
418 pgr->grec_auxwords = 0;
420 pgr->grec_mca = pmc->multiaddr;
421 pih = igmpv3_report_hdr(skb);
422 pih->ngrec = htons(ntohs(pih->ngrec)+1);
427 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
429 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
430 int type, int gdeleted, int sdeleted)
432 struct net_device *dev = pmc->interface->dev;
433 struct igmpv3_report *pih;
434 struct igmpv3_grec *pgr = NULL;
435 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
436 int scount, stotal, first, isquery, truncate;
438 if (pmc->multiaddr == IGMP_ALL_HOSTS)
441 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
442 type == IGMPV3_MODE_IS_EXCLUDE;
443 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
444 type == IGMPV3_CHANGE_TO_EXCLUDE;
448 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
453 pih = skb ? igmpv3_report_hdr(skb) : NULL;
455 /* EX and TO_EX get a fresh packet, if needed */
457 if (pih && pih->ngrec &&
458 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
460 igmpv3_sendpack(skb);
461 skb = igmpv3_newpack(dev, dev->mtu);
466 for (psf = *psf_list; psf; psf = psf_next) {
469 psf_next = psf->sf_next;
471 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
476 /* clear marks on query responses */
480 if (AVAILABLE(skb) < sizeof(__be32) +
481 first*sizeof(struct igmpv3_grec)) {
482 if (truncate && !first)
483 break; /* truncate these */
485 pgr->grec_nsrcs = htons(scount);
487 igmpv3_sendpack(skb);
488 skb = igmpv3_newpack(dev, dev->mtu);
493 skb = add_grhead(skb, pmc, type, &pgr);
498 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
499 *psrc = psf->sf_inaddr;
501 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
502 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
504 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
506 psf_prev->sf_next = psf->sf_next;
508 *psf_list = psf->sf_next;
518 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
519 type == IGMPV3_BLOCK_OLD_SOURCES)
521 if (pmc->crcount || isquery) {
522 /* make sure we have room for group header */
523 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
524 igmpv3_sendpack(skb);
525 skb = NULL; /* add_grhead will get a new one */
527 skb = add_grhead(skb, pmc, type, &pgr);
531 pgr->grec_nsrcs = htons(scount);
534 pmc->gsquery = 0; /* clear query state on report */
538 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
540 struct sk_buff *skb = NULL;
545 for_each_pmc_rcu(in_dev, pmc) {
546 if (pmc->multiaddr == IGMP_ALL_HOSTS)
548 spin_lock_bh(&pmc->lock);
549 if (pmc->sfcount[MCAST_EXCLUDE])
550 type = IGMPV3_MODE_IS_EXCLUDE;
552 type = IGMPV3_MODE_IS_INCLUDE;
553 skb = add_grec(skb, pmc, type, 0, 0);
554 spin_unlock_bh(&pmc->lock);
558 spin_lock_bh(&pmc->lock);
559 if (pmc->sfcount[MCAST_EXCLUDE])
560 type = IGMPV3_MODE_IS_EXCLUDE;
562 type = IGMPV3_MODE_IS_INCLUDE;
563 skb = add_grec(skb, pmc, type, 0, 0);
564 spin_unlock_bh(&pmc->lock);
568 return igmpv3_sendpack(skb);
572 * remove zero-count source records from a source filter list
574 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
576 struct ip_sf_list *psf_prev, *psf_next, *psf;
579 for (psf = *ppsf; psf; psf = psf_next) {
580 psf_next = psf->sf_next;
581 if (psf->sf_crcount == 0) {
583 psf_prev->sf_next = psf->sf_next;
585 *ppsf = psf->sf_next;
592 static void igmpv3_send_cr(struct in_device *in_dev)
594 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
595 struct sk_buff *skb = NULL;
599 spin_lock_bh(&in_dev->mc_tomb_lock);
603 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
604 pmc_next = pmc->next;
605 if (pmc->sfmode == MCAST_INCLUDE) {
606 type = IGMPV3_BLOCK_OLD_SOURCES;
607 dtype = IGMPV3_BLOCK_OLD_SOURCES;
608 skb = add_grec(skb, pmc, type, 1, 0);
609 skb = add_grec(skb, pmc, dtype, 1, 1);
612 if (pmc->sfmode == MCAST_EXCLUDE) {
613 type = IGMPV3_CHANGE_TO_INCLUDE;
614 skb = add_grec(skb, pmc, type, 1, 0);
617 if (pmc->crcount == 0) {
618 igmpv3_clear_zeros(&pmc->tomb);
619 igmpv3_clear_zeros(&pmc->sources);
622 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
624 pmc_prev->next = pmc_next;
626 in_dev->mc_tomb = pmc_next;
627 in_dev_put(pmc->interface);
632 spin_unlock_bh(&in_dev->mc_tomb_lock);
635 for_each_pmc_rcu(in_dev, pmc) {
636 spin_lock_bh(&pmc->lock);
637 if (pmc->sfcount[MCAST_EXCLUDE]) {
638 type = IGMPV3_BLOCK_OLD_SOURCES;
639 dtype = IGMPV3_ALLOW_NEW_SOURCES;
641 type = IGMPV3_ALLOW_NEW_SOURCES;
642 dtype = IGMPV3_BLOCK_OLD_SOURCES;
644 skb = add_grec(skb, pmc, type, 0, 0);
645 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
647 /* filter mode changes */
649 if (pmc->sfmode == MCAST_EXCLUDE)
650 type = IGMPV3_CHANGE_TO_EXCLUDE;
652 type = IGMPV3_CHANGE_TO_INCLUDE;
653 skb = add_grec(skb, pmc, type, 0, 0);
656 spin_unlock_bh(&pmc->lock);
662 (void) igmpv3_sendpack(skb);
665 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
672 struct net_device *dev = in_dev->dev;
673 struct net *net = dev_net(dev);
674 __be32 group = pmc ? pmc->multiaddr : 0;
679 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
680 return igmpv3_send_report(in_dev, pmc);
681 else if (type == IGMP_HOST_LEAVE_MESSAGE)
682 dst = IGMP_ALL_ROUTER;
686 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
688 IPPROTO_IGMP, 0, dev->ifindex);
692 hlen = LL_RESERVED_SPACE(dev);
693 tlen = dev->needed_tailroom;
694 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
699 skb->priority = TC_PRIO_CONTROL;
701 skb_dst_set(skb, &rt->dst);
703 skb_reserve(skb, hlen);
705 skb_reset_network_header(skb);
707 skb_put(skb, sizeof(struct iphdr) + 4);
710 iph->ihl = (sizeof(struct iphdr)+4)>>2;
712 iph->frag_off = htons(IP_DF);
715 iph->saddr = fl4.saddr;
716 iph->protocol = IPPROTO_IGMP;
717 ip_select_ident(skb, NULL);
718 ((u8 *)&iph[1])[0] = IPOPT_RA;
719 ((u8 *)&iph[1])[1] = 4;
720 ((u8 *)&iph[1])[2] = 0;
721 ((u8 *)&iph[1])[3] = 0;
723 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
728 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
730 return ip_local_out(skb);
733 static void igmp_gq_timer_expire(unsigned long data)
735 struct in_device *in_dev = (struct in_device *)data;
737 in_dev->mr_gq_running = 0;
738 igmpv3_send_report(in_dev, NULL);
742 static void igmp_ifc_timer_expire(unsigned long data)
744 struct in_device *in_dev = (struct in_device *)data;
746 igmpv3_send_cr(in_dev);
747 if (in_dev->mr_ifc_count) {
748 in_dev->mr_ifc_count--;
749 igmp_ifc_start_timer(in_dev,
750 unsolicited_report_interval(in_dev));
755 static void igmp_ifc_event(struct in_device *in_dev)
757 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
759 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv;
760 igmp_ifc_start_timer(in_dev, 1);
764 static void igmp_timer_expire(unsigned long data)
766 struct ip_mc_list *im = (struct ip_mc_list *)data;
767 struct in_device *in_dev = im->interface;
769 spin_lock(&im->lock);
772 if (im->unsolicit_count) {
773 im->unsolicit_count--;
774 igmp_start_timer(im, unsolicited_report_interval(in_dev));
777 spin_unlock(&im->lock);
779 if (IGMP_V1_SEEN(in_dev))
780 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
781 else if (IGMP_V2_SEEN(in_dev))
782 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
784 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
789 /* mark EXCLUDE-mode sources */
790 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
792 struct ip_sf_list *psf;
796 for (psf = pmc->sources; psf; psf = psf->sf_next) {
799 for (i = 0; i < nsrcs; i++) {
800 /* skip inactive filters */
801 if (psf->sf_count[MCAST_INCLUDE] ||
802 pmc->sfcount[MCAST_EXCLUDE] !=
803 psf->sf_count[MCAST_EXCLUDE])
805 if (srcs[i] == psf->sf_inaddr) {
812 if (scount == nsrcs) /* all sources excluded */
817 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
819 struct ip_sf_list *psf;
822 if (pmc->sfmode == MCAST_EXCLUDE)
823 return igmp_xmarksources(pmc, nsrcs, srcs);
825 /* mark INCLUDE-mode sources */
827 for (psf = pmc->sources; psf; psf = psf->sf_next) {
830 for (i = 0; i < nsrcs; i++)
831 if (srcs[i] == psf->sf_inaddr) {
845 /* return true if packet was dropped */
846 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
848 struct ip_mc_list *im;
850 /* Timers are only set for non-local groups */
852 if (group == IGMP_ALL_HOSTS)
856 for_each_pmc_rcu(in_dev, im) {
857 if (im->multiaddr == group) {
866 /* return true if packet was dropped */
867 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
870 struct igmphdr *ih = igmp_hdr(skb);
871 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
872 struct ip_mc_list *im;
873 __be32 group = ih->group;
880 /* Alas, old v1 router presents here. */
882 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
883 in_dev->mr_v1_seen = jiffies +
884 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
887 /* v2 router present */
888 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
889 in_dev->mr_v2_seen = jiffies +
890 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
892 /* cancel the interface change timer */
893 in_dev->mr_ifc_count = 0;
894 if (del_timer(&in_dev->mr_ifc_timer))
895 __in_dev_put(in_dev);
896 /* clear deleted report items */
897 igmpv3_clear_delrec(in_dev);
898 } else if (len < 12) {
899 return true; /* ignore bogus packet; freed by caller */
900 } else if (IGMP_V1_SEEN(in_dev)) {
901 /* This is a v3 query with v1 queriers present */
902 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
904 } else if (IGMP_V2_SEEN(in_dev)) {
905 /* this is a v3 query with v2 queriers present;
906 * Interpretation of the max_delay code is problematic here.
907 * A real v2 host would use ih_code directly, while v3 has a
908 * different encoding. We use the v3 encoding as more likely
909 * to be intended in a v3 query.
911 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
913 max_delay = 1; /* can't mod w/ 0 */
915 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
918 ih3 = igmpv3_query_hdr(skb);
920 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
921 + ntohs(ih3->nsrcs)*sizeof(__be32)))
923 ih3 = igmpv3_query_hdr(skb);
926 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
928 max_delay = 1; /* can't mod w/ 0 */
929 in_dev->mr_maxdelay = max_delay;
931 in_dev->mr_qrv = ih3->qrv;
932 if (!group) { /* general query */
934 return true; /* no sources allowed */
935 igmp_gq_start_timer(in_dev);
938 /* mark sources to include, if group & source-specific */
939 mark = ih3->nsrcs != 0;
943 * - Start the timers in all of our membership records
944 * that the query applies to for the interface on
945 * which the query arrived excl. those that belong
946 * to a "local" group (224.0.0.X)
947 * - For timers already running check if they need to
949 * - Use the igmp->igmp_code field as the maximum
953 for_each_pmc_rcu(in_dev, im) {
956 if (group && group != im->multiaddr)
958 if (im->multiaddr == IGMP_ALL_HOSTS)
960 spin_lock_bh(&im->lock);
962 im->gsquery = im->gsquery && mark;
965 changed = !im->gsquery ||
966 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
967 spin_unlock_bh(&im->lock);
969 igmp_mod_timer(im, max_delay);
975 /* called in rcu_read_lock() section */
976 int igmp_rcv(struct sk_buff *skb)
978 /* This basically follows the spec line by line -- see RFC1112 */
980 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
987 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
990 if (skb_checksum_simple_validate(skb))
995 case IGMP_HOST_MEMBERSHIP_QUERY:
996 dropped = igmp_heard_query(in_dev, skb, len);
998 case IGMP_HOST_MEMBERSHIP_REPORT:
999 case IGMPV2_HOST_MEMBERSHIP_REPORT:
1000 /* Is it our report looped back? */
1001 if (rt_is_output_route(skb_rtable(skb)))
1003 /* don't rely on MC router hearing unicast reports */
1004 if (skb->pkt_type == PACKET_MULTICAST ||
1005 skb->pkt_type == PACKET_BROADCAST)
1006 dropped = igmp_heard_report(in_dev, ih->group);
1009 #ifdef CONFIG_IP_PIMSM_V1
1010 return pim_rcv_v1(skb);
1012 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1015 case IGMP_HOST_LEAVE_MESSAGE:
1017 case IGMP_MTRACE_RESP:
1035 * Add a filter to a device
1038 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1040 char buf[MAX_ADDR_LEN];
1041 struct net_device *dev = in_dev->dev;
1043 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1044 We will get multicast token leakage, when IFF_MULTICAST
1045 is changed. This check should be done in ndo_set_rx_mode
1046 routine. Something sort of:
1047 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1050 if (arp_mc_map(addr, buf, dev, 0) == 0)
1051 dev_mc_add(dev, buf);
1055 * Remove a filter from a device
1058 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1060 char buf[MAX_ADDR_LEN];
1061 struct net_device *dev = in_dev->dev;
1063 if (arp_mc_map(addr, buf, dev, 0) == 0)
1064 dev_mc_del(dev, buf);
1067 #ifdef CONFIG_IP_MULTICAST
1069 * deleted ip_mc_list manipulation
1071 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1073 struct ip_mc_list *pmc;
1075 /* this is an "ip_mc_list" for convenience; only the fields below
1076 * are actually used. In particular, the refcnt and users are not
1077 * used for management of the delete list. Using the same structure
1078 * for deleted items allows change reports to use common code with
1079 * non-deleted or query-response MCA's.
1081 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1084 spin_lock_bh(&im->lock);
1085 pmc->interface = im->interface;
1086 in_dev_hold(in_dev);
1087 pmc->multiaddr = im->multiaddr;
1088 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1089 pmc->sfmode = im->sfmode;
1090 if (pmc->sfmode == MCAST_INCLUDE) {
1091 struct ip_sf_list *psf;
1093 pmc->tomb = im->tomb;
1094 pmc->sources = im->sources;
1095 im->tomb = im->sources = NULL;
1096 for (psf = pmc->sources; psf; psf = psf->sf_next)
1097 psf->sf_crcount = pmc->crcount;
1099 spin_unlock_bh(&im->lock);
1101 spin_lock_bh(&in_dev->mc_tomb_lock);
1102 pmc->next = in_dev->mc_tomb;
1103 in_dev->mc_tomb = pmc;
1104 spin_unlock_bh(&in_dev->mc_tomb_lock);
1107 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1109 struct ip_mc_list *pmc, *pmc_prev;
1110 struct ip_sf_list *psf, *psf_next;
1112 spin_lock_bh(&in_dev->mc_tomb_lock);
1114 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1115 if (pmc->multiaddr == multiaddr)
1121 pmc_prev->next = pmc->next;
1123 in_dev->mc_tomb = pmc->next;
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1127 for (psf = pmc->tomb; psf; psf = psf_next) {
1128 psf_next = psf->sf_next;
1131 in_dev_put(pmc->interface);
1136 static void igmpv3_clear_delrec(struct in_device *in_dev)
1138 struct ip_mc_list *pmc, *nextpmc;
1140 spin_lock_bh(&in_dev->mc_tomb_lock);
1141 pmc = in_dev->mc_tomb;
1142 in_dev->mc_tomb = NULL;
1143 spin_unlock_bh(&in_dev->mc_tomb_lock);
1145 for (; pmc; pmc = nextpmc) {
1146 nextpmc = pmc->next;
1147 ip_mc_clear_src(pmc);
1148 in_dev_put(pmc->interface);
1151 /* clear dead sources, too */
1153 for_each_pmc_rcu(in_dev, pmc) {
1154 struct ip_sf_list *psf, *psf_next;
1156 spin_lock_bh(&pmc->lock);
1159 spin_unlock_bh(&pmc->lock);
1160 for (; psf; psf = psf_next) {
1161 psf_next = psf->sf_next;
1169 static void igmp_group_dropped(struct ip_mc_list *im)
1171 struct in_device *in_dev = im->interface;
1172 #ifdef CONFIG_IP_MULTICAST
1178 ip_mc_filter_del(in_dev, im->multiaddr);
1181 #ifdef CONFIG_IP_MULTICAST
1182 if (im->multiaddr == IGMP_ALL_HOSTS)
1185 reporter = im->reporter;
1186 igmp_stop_timer(im);
1188 if (!in_dev->dead) {
1189 if (IGMP_V1_SEEN(in_dev))
1191 if (IGMP_V2_SEEN(in_dev)) {
1193 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1197 igmpv3_add_delrec(in_dev, im);
1199 igmp_ifc_event(in_dev);
1204 static void igmp_group_added(struct ip_mc_list *im)
1206 struct in_device *in_dev = im->interface;
1208 if (im->loaded == 0) {
1210 ip_mc_filter_add(in_dev, im->multiaddr);
1213 #ifdef CONFIG_IP_MULTICAST
1214 if (im->multiaddr == IGMP_ALL_HOSTS)
1219 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1220 spin_lock_bh(&im->lock);
1221 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1222 spin_unlock_bh(&im->lock);
1227 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1228 igmp_ifc_event(in_dev);
1234 * Multicast list managers
1237 static u32 ip_mc_hash(const struct ip_mc_list *im)
1239 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1242 static void ip_mc_hash_add(struct in_device *in_dev,
1243 struct ip_mc_list *im)
1245 struct ip_mc_list __rcu **mc_hash;
1248 mc_hash = rtnl_dereference(in_dev->mc_hash);
1250 hash = ip_mc_hash(im);
1251 im->next_hash = mc_hash[hash];
1252 rcu_assign_pointer(mc_hash[hash], im);
1256 /* do not use a hash table for small number of items */
1257 if (in_dev->mc_count < 4)
1260 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1265 for_each_pmc_rtnl(in_dev, im) {
1266 hash = ip_mc_hash(im);
1267 im->next_hash = mc_hash[hash];
1268 RCU_INIT_POINTER(mc_hash[hash], im);
1271 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1274 static void ip_mc_hash_remove(struct in_device *in_dev,
1275 struct ip_mc_list *im)
1277 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1278 struct ip_mc_list *aux;
1282 mc_hash += ip_mc_hash(im);
1283 while ((aux = rtnl_dereference(*mc_hash)) != im)
1284 mc_hash = &aux->next_hash;
1285 *mc_hash = im->next_hash;
1290 * A socket has joined a multicast group on device dev.
1293 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1295 struct ip_mc_list *im;
1299 for_each_pmc_rtnl(in_dev, im) {
1300 if (im->multiaddr == addr) {
1302 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1307 im = kzalloc(sizeof(*im), GFP_KERNEL);
1312 im->interface = in_dev;
1313 in_dev_hold(in_dev);
1314 im->multiaddr = addr;
1315 /* initial mode is (EX, empty) */
1316 im->sfmode = MCAST_EXCLUDE;
1317 im->sfcount[MCAST_EXCLUDE] = 1;
1318 atomic_set(&im->refcnt, 1);
1319 spin_lock_init(&im->lock);
1320 #ifdef CONFIG_IP_MULTICAST
1321 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1322 im->unsolicit_count = sysctl_igmp_qrv;
1325 im->next_rcu = in_dev->mc_list;
1327 rcu_assign_pointer(in_dev->mc_list, im);
1329 ip_mc_hash_add(in_dev, im);
1331 #ifdef CONFIG_IP_MULTICAST
1332 igmpv3_del_delrec(in_dev, im->multiaddr);
1334 igmp_group_added(im);
1336 ip_rt_multicast_event(in_dev);
1340 EXPORT_SYMBOL(ip_mc_inc_group);
1343 * Resend IGMP JOIN report; used by netdev notifier.
1345 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1347 #ifdef CONFIG_IP_MULTICAST
1348 struct ip_mc_list *im;
1353 for_each_pmc_rtnl(in_dev, im) {
1354 if (im->multiaddr == IGMP_ALL_HOSTS)
1357 /* a failover is happening and switches
1358 * must be notified immediately
1360 if (IGMP_V1_SEEN(in_dev))
1361 type = IGMP_HOST_MEMBERSHIP_REPORT;
1362 else if (IGMP_V2_SEEN(in_dev))
1363 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1365 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1366 igmp_send_report(in_dev, im, type);
1372 * A socket has left a multicast group on device dev
1375 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1377 struct ip_mc_list *i;
1378 struct ip_mc_list __rcu **ip;
1382 for (ip = &in_dev->mc_list;
1383 (i = rtnl_dereference(*ip)) != NULL;
1384 ip = &i->next_rcu) {
1385 if (i->multiaddr == addr) {
1386 if (--i->users == 0) {
1387 ip_mc_hash_remove(in_dev, i);
1390 igmp_group_dropped(i);
1394 ip_rt_multicast_event(in_dev);
1403 EXPORT_SYMBOL(ip_mc_dec_group);
1405 /* Device changing type */
1407 void ip_mc_unmap(struct in_device *in_dev)
1409 struct ip_mc_list *pmc;
1413 for_each_pmc_rtnl(in_dev, pmc)
1414 igmp_group_dropped(pmc);
1417 void ip_mc_remap(struct in_device *in_dev)
1419 struct ip_mc_list *pmc;
1423 for_each_pmc_rtnl(in_dev, pmc)
1424 igmp_group_added(pmc);
1427 /* Device going down */
1429 void ip_mc_down(struct in_device *in_dev)
1431 struct ip_mc_list *pmc;
1435 for_each_pmc_rtnl(in_dev, pmc)
1436 igmp_group_dropped(pmc);
1438 #ifdef CONFIG_IP_MULTICAST
1439 in_dev->mr_ifc_count = 0;
1440 if (del_timer(&in_dev->mr_ifc_timer))
1441 __in_dev_put(in_dev);
1442 in_dev->mr_gq_running = 0;
1443 if (del_timer(&in_dev->mr_gq_timer))
1444 __in_dev_put(in_dev);
1445 igmpv3_clear_delrec(in_dev);
1448 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1451 void ip_mc_init_dev(struct in_device *in_dev)
1455 #ifdef CONFIG_IP_MULTICAST
1456 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1457 (unsigned long)in_dev);
1458 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1459 (unsigned long)in_dev);
1460 in_dev->mr_qrv = sysctl_igmp_qrv;
1463 spin_lock_init(&in_dev->mc_tomb_lock);
1466 /* Device going up */
1468 void ip_mc_up(struct in_device *in_dev)
1470 struct ip_mc_list *pmc;
1474 #ifdef CONFIG_IP_MULTICAST
1475 in_dev->mr_qrv = sysctl_igmp_qrv;
1477 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1479 for_each_pmc_rtnl(in_dev, pmc)
1480 igmp_group_added(pmc);
1484 * Device is about to be destroyed: clean up.
1487 void ip_mc_destroy_dev(struct in_device *in_dev)
1489 struct ip_mc_list *i;
1493 /* Deactivate timers */
1496 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1497 in_dev->mc_list = i->next_rcu;
1500 /* We've dropped the groups in ip_mc_down already */
1506 /* RTNL is locked */
1507 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1509 struct net_device *dev = NULL;
1510 struct in_device *idev = NULL;
1512 if (imr->imr_ifindex) {
1513 idev = inetdev_by_index(net, imr->imr_ifindex);
1516 if (imr->imr_address.s_addr) {
1517 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1523 struct rtable *rt = ip_route_output(net,
1524 imr->imr_multiaddr.s_addr,
1532 imr->imr_ifindex = dev->ifindex;
1533 idev = __in_dev_get_rtnl(dev);
1539 * Join a socket to a group
1541 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1542 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1543 #ifdef CONFIG_IP_MULTICAST
1544 int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE;
1547 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1550 struct ip_sf_list *psf, *psf_prev;
1554 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1555 if (psf->sf_inaddr == *psfsrc)
1559 if (!psf || psf->sf_count[sfmode] == 0) {
1560 /* source filter not found, or count wrong => bug */
1563 psf->sf_count[sfmode]--;
1564 if (psf->sf_count[sfmode] == 0) {
1565 ip_rt_multicast_event(pmc->interface);
1567 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1568 #ifdef CONFIG_IP_MULTICAST
1569 struct in_device *in_dev = pmc->interface;
1572 /* no more filters for this source */
1574 psf_prev->sf_next = psf->sf_next;
1576 pmc->sources = psf->sf_next;
1577 #ifdef CONFIG_IP_MULTICAST
1578 if (psf->sf_oldin &&
1579 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1580 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1581 psf->sf_next = pmc->tomb;
1591 #ifndef CONFIG_IP_MULTICAST
1592 #define igmp_ifc_event(x) do { } while (0)
1595 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1596 int sfcount, __be32 *psfsrc, int delta)
1598 struct ip_mc_list *pmc;
1605 for_each_pmc_rcu(in_dev, pmc) {
1606 if (*pmca == pmc->multiaddr)
1610 /* MCA not found?? bug */
1614 spin_lock_bh(&pmc->lock);
1616 #ifdef CONFIG_IP_MULTICAST
1621 if (!pmc->sfcount[sfmode])
1623 pmc->sfcount[sfmode]--;
1626 for (i = 0; i < sfcount; i++) {
1627 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1629 changerec |= rv > 0;
1633 if (pmc->sfmode == MCAST_EXCLUDE &&
1634 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1635 pmc->sfcount[MCAST_INCLUDE]) {
1636 #ifdef CONFIG_IP_MULTICAST
1637 struct ip_sf_list *psf;
1640 /* filter mode change */
1641 pmc->sfmode = MCAST_INCLUDE;
1642 #ifdef CONFIG_IP_MULTICAST
1643 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1644 in_dev->mr_ifc_count = pmc->crcount;
1645 for (psf = pmc->sources; psf; psf = psf->sf_next)
1646 psf->sf_crcount = 0;
1647 igmp_ifc_event(pmc->interface);
1648 } else if (sf_setstate(pmc) || changerec) {
1649 igmp_ifc_event(pmc->interface);
1653 spin_unlock_bh(&pmc->lock);
1658 * Add multicast single-source filter to the interface list
1660 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1663 struct ip_sf_list *psf, *psf_prev;
1666 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1667 if (psf->sf_inaddr == *psfsrc)
1672 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1675 psf->sf_inaddr = *psfsrc;
1677 psf_prev->sf_next = psf;
1681 psf->sf_count[sfmode]++;
1682 if (psf->sf_count[sfmode] == 1) {
1683 ip_rt_multicast_event(pmc->interface);
1688 #ifdef CONFIG_IP_MULTICAST
1689 static void sf_markstate(struct ip_mc_list *pmc)
1691 struct ip_sf_list *psf;
1692 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1694 for (psf = pmc->sources; psf; psf = psf->sf_next)
1695 if (pmc->sfcount[MCAST_EXCLUDE]) {
1696 psf->sf_oldin = mca_xcount ==
1697 psf->sf_count[MCAST_EXCLUDE] &&
1698 !psf->sf_count[MCAST_INCLUDE];
1700 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1703 static int sf_setstate(struct ip_mc_list *pmc)
1705 struct ip_sf_list *psf, *dpsf;
1706 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1707 int qrv = pmc->interface->mr_qrv;
1711 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1712 if (pmc->sfcount[MCAST_EXCLUDE]) {
1713 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1714 !psf->sf_count[MCAST_INCLUDE];
1716 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1718 if (!psf->sf_oldin) {
1719 struct ip_sf_list *prev = NULL;
1721 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1722 if (dpsf->sf_inaddr == psf->sf_inaddr)
1728 prev->sf_next = dpsf->sf_next;
1730 pmc->tomb = dpsf->sf_next;
1733 psf->sf_crcount = qrv;
1736 } else if (psf->sf_oldin) {
1738 psf->sf_crcount = 0;
1740 * add or update "delete" records if an active filter
1743 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1744 if (dpsf->sf_inaddr == psf->sf_inaddr)
1747 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1751 /* pmc->lock held by callers */
1752 dpsf->sf_next = pmc->tomb;
1755 dpsf->sf_crcount = qrv;
1764 * Add multicast source filter list to the interface list
1766 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1767 int sfcount, __be32 *psfsrc, int delta)
1769 struct ip_mc_list *pmc;
1776 for_each_pmc_rcu(in_dev, pmc) {
1777 if (*pmca == pmc->multiaddr)
1781 /* MCA not found?? bug */
1785 spin_lock_bh(&pmc->lock);
1788 #ifdef CONFIG_IP_MULTICAST
1791 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1793 pmc->sfcount[sfmode]++;
1795 for (i = 0; i < sfcount; i++) {
1796 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1804 pmc->sfcount[sfmode]--;
1805 for (j = 0; j < i; j++)
1806 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1807 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1808 #ifdef CONFIG_IP_MULTICAST
1809 struct ip_sf_list *psf;
1810 in_dev = pmc->interface;
1813 /* filter mode change */
1814 if (pmc->sfcount[MCAST_EXCLUDE])
1815 pmc->sfmode = MCAST_EXCLUDE;
1816 else if (pmc->sfcount[MCAST_INCLUDE])
1817 pmc->sfmode = MCAST_INCLUDE;
1818 #ifdef CONFIG_IP_MULTICAST
1819 /* else no filters; keep old mode for reports */
1821 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1822 in_dev->mr_ifc_count = pmc->crcount;
1823 for (psf = pmc->sources; psf; psf = psf->sf_next)
1824 psf->sf_crcount = 0;
1825 igmp_ifc_event(in_dev);
1826 } else if (sf_setstate(pmc)) {
1827 igmp_ifc_event(in_dev);
1830 spin_unlock_bh(&pmc->lock);
1834 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1836 struct ip_sf_list *psf, *nextpsf;
1838 for (psf = pmc->tomb; psf; psf = nextpsf) {
1839 nextpsf = psf->sf_next;
1843 for (psf = pmc->sources; psf; psf = nextpsf) {
1844 nextpsf = psf->sf_next;
1847 pmc->sources = NULL;
1848 pmc->sfmode = MCAST_EXCLUDE;
1849 pmc->sfcount[MCAST_INCLUDE] = 0;
1850 pmc->sfcount[MCAST_EXCLUDE] = 1;
1853 /* Join a multicast group
1856 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
1858 __be32 addr = imr->imr_multiaddr.s_addr;
1859 struct ip_mc_socklist *iml, *i;
1860 struct in_device *in_dev;
1861 struct inet_sock *inet = inet_sk(sk);
1862 struct net *net = sock_net(sk);
1869 if (!ipv4_is_multicast(addr))
1872 in_dev = ip_mc_find_dev(net, imr);
1880 ifindex = imr->imr_ifindex;
1881 for_each_pmc_rtnl(inet, i) {
1882 if (i->multi.imr_multiaddr.s_addr == addr &&
1883 i->multi.imr_ifindex == ifindex)
1888 if (count >= sysctl_igmp_max_memberships)
1890 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1894 memcpy(&iml->multi, imr, sizeof(*imr));
1895 iml->next_rcu = inet->mc_list;
1897 iml->sfmode = MCAST_EXCLUDE;
1898 rcu_assign_pointer(inet->mc_list, iml);
1899 ip_mc_inc_group(in_dev, addr);
1904 EXPORT_SYMBOL(ip_mc_join_group);
1906 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1907 struct in_device *in_dev)
1909 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1913 /* any-source empty exclude case */
1914 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1915 iml->sfmode, 0, NULL, 0);
1917 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1918 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1919 RCU_INIT_POINTER(iml->sflist, NULL);
1920 /* decrease mem now to avoid the memleak warning */
1921 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1922 kfree_rcu(psf, rcu);
1926 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1928 struct inet_sock *inet = inet_sk(sk);
1929 struct ip_mc_socklist *iml;
1930 struct ip_mc_socklist __rcu **imlp;
1931 struct in_device *in_dev;
1932 struct net *net = sock_net(sk);
1933 __be32 group = imr->imr_multiaddr.s_addr;
1935 int ret = -EADDRNOTAVAIL;
1939 in_dev = ip_mc_find_dev(net, imr);
1944 ifindex = imr->imr_ifindex;
1945 for (imlp = &inet->mc_list;
1946 (iml = rtnl_dereference(*imlp)) != NULL;
1947 imlp = &iml->next_rcu) {
1948 if (iml->multi.imr_multiaddr.s_addr != group)
1951 if (iml->multi.imr_ifindex != ifindex)
1953 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1954 iml->multi.imr_address.s_addr)
1957 (void) ip_mc_leave_src(sk, iml, in_dev);
1959 *imlp = iml->next_rcu;
1961 ip_mc_dec_group(in_dev, group);
1963 /* decrease mem now to avoid the memleak warning */
1964 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1965 kfree_rcu(iml, rcu);
1971 EXPORT_SYMBOL(ip_mc_leave_group);
1973 int ip_mc_source(int add, int omode, struct sock *sk, struct
1974 ip_mreq_source *mreqs, int ifindex)
1977 struct ip_mreqn imr;
1978 __be32 addr = mreqs->imr_multiaddr;
1979 struct ip_mc_socklist *pmc;
1980 struct in_device *in_dev = NULL;
1981 struct inet_sock *inet = inet_sk(sk);
1982 struct ip_sf_socklist *psl;
1983 struct net *net = sock_net(sk);
1987 if (!ipv4_is_multicast(addr))
1992 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1993 imr.imr_address.s_addr = mreqs->imr_interface;
1994 imr.imr_ifindex = ifindex;
1995 in_dev = ip_mc_find_dev(net, &imr);
2001 err = -EADDRNOTAVAIL;
2003 for_each_pmc_rtnl(inet, pmc) {
2004 if ((pmc->multi.imr_multiaddr.s_addr ==
2005 imr.imr_multiaddr.s_addr) &&
2006 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2009 if (!pmc) { /* must have a prior join */
2013 /* if a source filter was set, must be the same mode as before */
2015 if (pmc->sfmode != omode) {
2019 } else if (pmc->sfmode != omode) {
2020 /* allow mode switches for empty-set filters */
2021 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2022 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2024 pmc->sfmode = omode;
2027 psl = rtnl_dereference(pmc->sflist);
2030 goto done; /* err = -EADDRNOTAVAIL */
2032 for (i = 0; i < psl->sl_count; i++) {
2033 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2038 if (rv) /* source not found */
2039 goto done; /* err = -EADDRNOTAVAIL */
2041 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2042 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2047 /* update the interface filter */
2048 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2049 &mreqs->imr_sourceaddr, 1);
2051 for (j = i+1; j < psl->sl_count; j++)
2052 psl->sl_addr[j-1] = psl->sl_addr[j];
2057 /* else, add a new source to the filter */
2059 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2063 if (!psl || psl->sl_count == psl->sl_max) {
2064 struct ip_sf_socklist *newpsl;
2065 int count = IP_SFBLOCK;
2068 count += psl->sl_max;
2069 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2074 newpsl->sl_max = count;
2075 newpsl->sl_count = count - IP_SFBLOCK;
2077 for (i = 0; i < psl->sl_count; i++)
2078 newpsl->sl_addr[i] = psl->sl_addr[i];
2079 /* decrease mem now to avoid the memleak warning */
2080 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2081 kfree_rcu(psl, rcu);
2083 rcu_assign_pointer(pmc->sflist, newpsl);
2086 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2087 for (i = 0; i < psl->sl_count; i++) {
2088 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2093 if (rv == 0) /* address already there is an error */
2095 for (j = psl->sl_count-1; j >= i; j--)
2096 psl->sl_addr[j+1] = psl->sl_addr[j];
2097 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2100 /* update the interface list */
2101 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2102 &mreqs->imr_sourceaddr, 1);
2105 err = ip_mc_leave_group(sk, &imr);
2109 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2112 struct ip_mreqn imr;
2113 __be32 addr = msf->imsf_multiaddr;
2114 struct ip_mc_socklist *pmc;
2115 struct in_device *in_dev;
2116 struct inet_sock *inet = inet_sk(sk);
2117 struct ip_sf_socklist *newpsl, *psl;
2118 struct net *net = sock_net(sk);
2121 if (!ipv4_is_multicast(addr))
2123 if (msf->imsf_fmode != MCAST_INCLUDE &&
2124 msf->imsf_fmode != MCAST_EXCLUDE)
2129 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2130 imr.imr_address.s_addr = msf->imsf_interface;
2131 imr.imr_ifindex = ifindex;
2132 in_dev = ip_mc_find_dev(net, &imr);
2139 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2140 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2145 for_each_pmc_rtnl(inet, pmc) {
2146 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2147 pmc->multi.imr_ifindex == imr.imr_ifindex)
2150 if (!pmc) { /* must have a prior join */
2154 if (msf->imsf_numsrc) {
2155 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2161 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2162 memcpy(newpsl->sl_addr, msf->imsf_slist,
2163 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2164 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2165 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2167 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2172 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2173 msf->imsf_fmode, 0, NULL, 0);
2175 psl = rtnl_dereference(pmc->sflist);
2177 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2178 psl->sl_count, psl->sl_addr, 0);
2179 /* decrease mem now to avoid the memleak warning */
2180 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2181 kfree_rcu(psl, rcu);
2183 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2185 rcu_assign_pointer(pmc->sflist, newpsl);
2186 pmc->sfmode = msf->imsf_fmode;
2190 err = ip_mc_leave_group(sk, &imr);
2194 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2195 struct ip_msfilter __user *optval, int __user *optlen)
2197 int err, len, count, copycount;
2198 struct ip_mreqn imr;
2199 __be32 addr = msf->imsf_multiaddr;
2200 struct ip_mc_socklist *pmc;
2201 struct in_device *in_dev;
2202 struct inet_sock *inet = inet_sk(sk);
2203 struct ip_sf_socklist *psl;
2204 struct net *net = sock_net(sk);
2206 if (!ipv4_is_multicast(addr))
2211 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2212 imr.imr_address.s_addr = msf->imsf_interface;
2213 imr.imr_ifindex = 0;
2214 in_dev = ip_mc_find_dev(net, &imr);
2220 err = -EADDRNOTAVAIL;
2222 for_each_pmc_rtnl(inet, pmc) {
2223 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2224 pmc->multi.imr_ifindex == imr.imr_ifindex)
2227 if (!pmc) /* must have a prior join */
2229 msf->imsf_fmode = pmc->sfmode;
2230 psl = rtnl_dereference(pmc->sflist);
2236 count = psl->sl_count;
2238 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2239 len = copycount * sizeof(psl->sl_addr[0]);
2240 msf->imsf_numsrc = count;
2241 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2242 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2246 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2254 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2255 struct group_filter __user *optval, int __user *optlen)
2257 int err, i, count, copycount;
2258 struct sockaddr_in *psin;
2260 struct ip_mc_socklist *pmc;
2261 struct inet_sock *inet = inet_sk(sk);
2262 struct ip_sf_socklist *psl;
2264 psin = (struct sockaddr_in *)&gsf->gf_group;
2265 if (psin->sin_family != AF_INET)
2267 addr = psin->sin_addr.s_addr;
2268 if (!ipv4_is_multicast(addr))
2273 err = -EADDRNOTAVAIL;
2275 for_each_pmc_rtnl(inet, pmc) {
2276 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2277 pmc->multi.imr_ifindex == gsf->gf_interface)
2280 if (!pmc) /* must have a prior join */
2282 gsf->gf_fmode = pmc->sfmode;
2283 psl = rtnl_dereference(pmc->sflist);
2285 count = psl ? psl->sl_count : 0;
2286 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2287 gsf->gf_numsrc = count;
2288 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2289 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2292 for (i = 0; i < copycount; i++) {
2293 struct sockaddr_storage ss;
2295 psin = (struct sockaddr_in *)&ss;
2296 memset(&ss, 0, sizeof(ss));
2297 psin->sin_family = AF_INET;
2298 psin->sin_addr.s_addr = psl->sl_addr[i];
2299 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2309 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2311 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2313 struct inet_sock *inet = inet_sk(sk);
2314 struct ip_mc_socklist *pmc;
2315 struct ip_sf_socklist *psl;
2320 if (!ipv4_is_multicast(loc_addr))
2324 for_each_pmc_rcu(inet, pmc) {
2325 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2326 pmc->multi.imr_ifindex == dif)
2332 psl = rcu_dereference(pmc->sflist);
2333 ret = (pmc->sfmode == MCAST_EXCLUDE);
2337 for (i = 0; i < psl->sl_count; i++) {
2338 if (psl->sl_addr[i] == rmt_addr)
2342 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2344 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2354 * A socket is closing.
2357 void ip_mc_drop_socket(struct sock *sk)
2359 struct inet_sock *inet = inet_sk(sk);
2360 struct ip_mc_socklist *iml;
2361 struct net *net = sock_net(sk);
2363 if (inet->mc_list == NULL)
2367 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2368 struct in_device *in_dev;
2370 inet->mc_list = iml->next_rcu;
2371 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2372 (void) ip_mc_leave_src(sk, iml, in_dev);
2374 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2375 /* decrease mem now to avoid the memleak warning */
2376 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2377 kfree_rcu(iml, rcu);
2382 /* called with rcu_read_lock() */
2383 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2385 struct ip_mc_list *im;
2386 struct ip_mc_list __rcu **mc_hash;
2387 struct ip_sf_list *psf;
2390 mc_hash = rcu_dereference(in_dev->mc_hash);
2392 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2394 for (im = rcu_dereference(mc_hash[hash]);
2396 im = rcu_dereference(im->next_hash)) {
2397 if (im->multiaddr == mc_addr)
2401 for_each_pmc_rcu(in_dev, im) {
2402 if (im->multiaddr == mc_addr)
2406 if (im && proto == IPPROTO_IGMP) {
2410 for (psf = im->sources; psf; psf = psf->sf_next) {
2411 if (psf->sf_inaddr == src_addr)
2415 rv = psf->sf_count[MCAST_INCLUDE] ||
2416 psf->sf_count[MCAST_EXCLUDE] !=
2417 im->sfcount[MCAST_EXCLUDE];
2419 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2421 rv = 1; /* unspecified source; tentatively allow */
2426 #if defined(CONFIG_PROC_FS)
2427 struct igmp_mc_iter_state {
2428 struct seq_net_private p;
2429 struct net_device *dev;
2430 struct in_device *in_dev;
2433 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2435 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2437 struct net *net = seq_file_net(seq);
2438 struct ip_mc_list *im = NULL;
2439 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2441 state->in_dev = NULL;
2442 for_each_netdev_rcu(net, state->dev) {
2443 struct in_device *in_dev;
2445 in_dev = __in_dev_get_rcu(state->dev);
2448 im = rcu_dereference(in_dev->mc_list);
2450 state->in_dev = in_dev;
2457 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2459 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2461 im = rcu_dereference(im->next_rcu);
2463 state->dev = next_net_device_rcu(state->dev);
2465 state->in_dev = NULL;
2468 state->in_dev = __in_dev_get_rcu(state->dev);
2471 im = rcu_dereference(state->in_dev->mc_list);
2476 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2478 struct ip_mc_list *im = igmp_mc_get_first(seq);
2480 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2482 return pos ? NULL : im;
2485 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2489 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2492 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2494 struct ip_mc_list *im;
2495 if (v == SEQ_START_TOKEN)
2496 im = igmp_mc_get_first(seq);
2498 im = igmp_mc_get_next(seq, v);
2503 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2506 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2508 state->in_dev = NULL;
2513 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2515 if (v == SEQ_START_TOKEN)
2517 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2519 struct ip_mc_list *im = (struct ip_mc_list *)v;
2520 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2524 #ifdef CONFIG_IP_MULTICAST
2525 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2526 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2532 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2533 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2534 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2537 delta = im->timer.expires - jiffies;
2539 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2540 im->multiaddr, im->users,
2542 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2548 static const struct seq_operations igmp_mc_seq_ops = {
2549 .start = igmp_mc_seq_start,
2550 .next = igmp_mc_seq_next,
2551 .stop = igmp_mc_seq_stop,
2552 .show = igmp_mc_seq_show,
2555 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2557 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2558 sizeof(struct igmp_mc_iter_state));
2561 static const struct file_operations igmp_mc_seq_fops = {
2562 .owner = THIS_MODULE,
2563 .open = igmp_mc_seq_open,
2565 .llseek = seq_lseek,
2566 .release = seq_release_net,
2569 struct igmp_mcf_iter_state {
2570 struct seq_net_private p;
2571 struct net_device *dev;
2572 struct in_device *idev;
2573 struct ip_mc_list *im;
2576 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2578 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2580 struct net *net = seq_file_net(seq);
2581 struct ip_sf_list *psf = NULL;
2582 struct ip_mc_list *im = NULL;
2583 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2587 for_each_netdev_rcu(net, state->dev) {
2588 struct in_device *idev;
2589 idev = __in_dev_get_rcu(state->dev);
2590 if (unlikely(idev == NULL))
2592 im = rcu_dereference(idev->mc_list);
2593 if (likely(im != NULL)) {
2594 spin_lock_bh(&im->lock);
2596 if (likely(psf != NULL)) {
2601 spin_unlock_bh(&im->lock);
2607 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2609 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2613 spin_unlock_bh(&state->im->lock);
2614 state->im = state->im->next;
2615 while (!state->im) {
2616 state->dev = next_net_device_rcu(state->dev);
2621 state->idev = __in_dev_get_rcu(state->dev);
2624 state->im = rcu_dereference(state->idev->mc_list);
2628 spin_lock_bh(&state->im->lock);
2629 psf = state->im->sources;
2635 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2637 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2639 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2641 return pos ? NULL : psf;
2644 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2648 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2651 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2653 struct ip_sf_list *psf;
2654 if (v == SEQ_START_TOKEN)
2655 psf = igmp_mcf_get_first(seq);
2657 psf = igmp_mcf_get_next(seq, v);
2662 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2665 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2666 if (likely(state->im != NULL)) {
2667 spin_unlock_bh(&state->im->lock);
2675 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2677 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2678 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2680 if (v == SEQ_START_TOKEN) {
2681 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2685 "0x%08x %6lu %6lu\n",
2686 state->dev->ifindex, state->dev->name,
2687 ntohl(state->im->multiaddr),
2688 ntohl(psf->sf_inaddr),
2689 psf->sf_count[MCAST_INCLUDE],
2690 psf->sf_count[MCAST_EXCLUDE]);
2695 static const struct seq_operations igmp_mcf_seq_ops = {
2696 .start = igmp_mcf_seq_start,
2697 .next = igmp_mcf_seq_next,
2698 .stop = igmp_mcf_seq_stop,
2699 .show = igmp_mcf_seq_show,
2702 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2704 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2705 sizeof(struct igmp_mcf_iter_state));
2708 static const struct file_operations igmp_mcf_seq_fops = {
2709 .owner = THIS_MODULE,
2710 .open = igmp_mcf_seq_open,
2712 .llseek = seq_lseek,
2713 .release = seq_release_net,
2716 static int __net_init igmp_net_init(struct net *net)
2718 struct proc_dir_entry *pde;
2721 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2724 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2725 &igmp_mcf_seq_fops);
2728 err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET,
2729 SOCK_DGRAM, 0, net);
2731 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2739 remove_proc_entry("mcfilter", net->proc_net);
2741 remove_proc_entry("igmp", net->proc_net);
2746 static void __net_exit igmp_net_exit(struct net *net)
2748 remove_proc_entry("mcfilter", net->proc_net);
2749 remove_proc_entry("igmp", net->proc_net);
2750 inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk);
2753 static struct pernet_operations igmp_net_ops = {
2754 .init = igmp_net_init,
2755 .exit = igmp_net_exit,
2759 static int igmp_netdev_event(struct notifier_block *this,
2760 unsigned long event, void *ptr)
2762 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2763 struct in_device *in_dev;
2766 case NETDEV_RESEND_IGMP:
2767 in_dev = __in_dev_get_rtnl(dev);
2769 ip_mc_rejoin_groups(in_dev);
2777 static struct notifier_block igmp_notifier = {
2778 .notifier_call = igmp_netdev_event,
2781 int __init igmp_mc_init(void)
2783 #if defined(CONFIG_PROC_FS)
2786 err = register_pernet_subsys(&igmp_net_ops);
2789 err = register_netdevice_notifier(&igmp_notifier);
2791 goto reg_notif_fail;
2795 unregister_pernet_subsys(&igmp_net_ops);
2798 return register_netdevice_notifier(&igmp_notifier);