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 <linux/netfilter_ipv4.h>
101 #ifdef CONFIG_IP_MROUTE
102 #include <linux/mroute.h>
104 #ifdef CONFIG_PROC_FS
105 #include <linux/proc_fs.h>
106 #include <linux/seq_file.h>
109 #define IP_MAX_MEMBERSHIPS 20
110 #define IP_MAX_MSF 10
112 #ifdef CONFIG_IP_MULTICAST
113 /* Parameter names and values are taken from igmp-v2-06 draft */
115 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
116 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
117 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
118 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
119 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
120 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
123 #define IGMP_INITIAL_REPORT_DELAY (1)
125 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
126 * IGMP specs require to report membership immediately after
127 * joining a group, but we delay the first report by a
128 * small interval. It seems more natural and still does not
129 * contradict to specs provided this delay is small enough.
132 #define IGMP_V1_SEEN(in_dev) \
133 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
134 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
135 ((in_dev)->mr_v1_seen && \
136 time_before(jiffies, (in_dev)->mr_v1_seen)))
137 #define IGMP_V2_SEEN(in_dev) \
138 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
139 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
140 ((in_dev)->mr_v2_seen && \
141 time_before(jiffies, (in_dev)->mr_v2_seen)))
143 static int unsolicited_report_interval(struct in_device *in_dev)
145 int interval_ms, interval_jiffies;
147 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
148 interval_ms = IN_DEV_CONF_GET(
150 IGMPV2_UNSOLICITED_REPORT_INTERVAL);
152 interval_ms = IN_DEV_CONF_GET(
154 IGMPV3_UNSOLICITED_REPORT_INTERVAL);
156 interval_jiffies = msecs_to_jiffies(interval_ms);
158 /* _timer functions can't handle a delay of 0 jiffies so ensure
159 * we always return a positive value.
161 if (interval_jiffies <= 0)
162 interval_jiffies = 1;
163 return interval_jiffies;
166 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
167 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
168 static void igmpv3_clear_delrec(struct in_device *in_dev);
169 static int sf_setstate(struct ip_mc_list *pmc);
170 static void sf_markstate(struct ip_mc_list *pmc);
172 static void ip_mc_clear_src(struct ip_mc_list *pmc);
173 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
174 int sfcount, __be32 *psfsrc, int delta);
176 static void ip_ma_put(struct ip_mc_list *im)
178 if (atomic_dec_and_test(&im->refcnt)) {
179 in_dev_put(im->interface);
184 #define for_each_pmc_rcu(in_dev, pmc) \
185 for (pmc = rcu_dereference(in_dev->mc_list); \
187 pmc = rcu_dereference(pmc->next_rcu))
189 #define for_each_pmc_rtnl(in_dev, pmc) \
190 for (pmc = rtnl_dereference(in_dev->mc_list); \
192 pmc = rtnl_dereference(pmc->next_rcu))
194 #ifdef CONFIG_IP_MULTICAST
200 static void igmp_stop_timer(struct ip_mc_list *im)
202 spin_lock_bh(&im->lock);
203 if (del_timer(&im->timer))
204 atomic_dec(&im->refcnt);
207 im->unsolicit_count = 0;
208 spin_unlock_bh(&im->lock);
211 /* It must be called with locked im->lock */
212 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
214 int tv = prandom_u32() % max_delay;
217 if (!mod_timer(&im->timer, jiffies+tv+2))
218 atomic_inc(&im->refcnt);
221 static void igmp_gq_start_timer(struct in_device *in_dev)
223 int tv = prandom_u32() % in_dev->mr_maxdelay;
225 in_dev->mr_gq_running = 1;
226 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
230 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
232 int tv = prandom_u32() % delay;
234 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
238 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
240 spin_lock_bh(&im->lock);
241 im->unsolicit_count = 0;
242 if (del_timer(&im->timer)) {
243 if ((long)(im->timer.expires-jiffies) < max_delay) {
244 add_timer(&im->timer);
246 spin_unlock_bh(&im->lock);
249 atomic_dec(&im->refcnt);
251 igmp_start_timer(im, max_delay);
252 spin_unlock_bh(&im->lock);
257 * Send an IGMP report.
260 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
263 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
264 int gdeleted, int sdeleted)
267 case IGMPV3_MODE_IS_INCLUDE:
268 case IGMPV3_MODE_IS_EXCLUDE:
269 if (gdeleted || sdeleted)
271 if (!(pmc->gsquery && !psf->sf_gsresp)) {
272 if (pmc->sfmode == MCAST_INCLUDE)
274 /* don't include if this source is excluded
277 if (psf->sf_count[MCAST_INCLUDE])
278 return type == IGMPV3_MODE_IS_INCLUDE;
279 return pmc->sfcount[MCAST_EXCLUDE] ==
280 psf->sf_count[MCAST_EXCLUDE];
283 case IGMPV3_CHANGE_TO_INCLUDE:
284 if (gdeleted || sdeleted)
286 return psf->sf_count[MCAST_INCLUDE] != 0;
287 case IGMPV3_CHANGE_TO_EXCLUDE:
288 if (gdeleted || sdeleted)
290 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
291 psf->sf_count[MCAST_INCLUDE])
293 return pmc->sfcount[MCAST_EXCLUDE] ==
294 psf->sf_count[MCAST_EXCLUDE];
295 case IGMPV3_ALLOW_NEW_SOURCES:
296 if (gdeleted || !psf->sf_crcount)
298 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
299 case IGMPV3_BLOCK_OLD_SOURCES:
300 if (pmc->sfmode == MCAST_INCLUDE)
301 return gdeleted || (psf->sf_crcount && sdeleted);
302 return psf->sf_crcount && !gdeleted && !sdeleted;
308 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
310 struct ip_sf_list *psf;
313 for (psf = pmc->sources; psf; psf = psf->sf_next) {
314 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
321 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
326 struct igmpv3_report *pig;
327 struct net *net = dev_net(dev);
329 int hlen = LL_RESERVED_SPACE(dev);
330 int tlen = dev->needed_tailroom;
331 unsigned int size = mtu;
334 skb = alloc_skb(size + hlen + tlen,
335 GFP_ATOMIC | __GFP_NOWARN);
342 skb->priority = TC_PRIO_CONTROL;
344 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
346 IPPROTO_IGMP, 0, dev->ifindex);
352 skb_dst_set(skb, &rt->dst);
355 skb->reserved_tailroom = skb_end_offset(skb) -
356 min(mtu, skb_end_offset(skb));
357 skb_reserve(skb, hlen);
359 skb_reset_network_header(skb);
361 skb_put(skb, sizeof(struct iphdr) + 4);
364 pip->ihl = (sizeof(struct iphdr)+4)>>2;
366 pip->frag_off = htons(IP_DF);
368 pip->daddr = fl4.daddr;
369 pip->saddr = fl4.saddr;
370 pip->protocol = IPPROTO_IGMP;
371 pip->tot_len = 0; /* filled in later */
372 ip_select_ident(skb, NULL);
373 ((u8 *)&pip[1])[0] = IPOPT_RA;
374 ((u8 *)&pip[1])[1] = 4;
375 ((u8 *)&pip[1])[2] = 0;
376 ((u8 *)&pip[1])[3] = 0;
378 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
379 skb_put(skb, sizeof(*pig));
380 pig = igmpv3_report_hdr(skb);
381 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
389 static int igmpv3_sendpack(struct sk_buff *skb)
391 struct igmphdr *pig = igmp_hdr(skb);
392 const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb);
394 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
396 return ip_local_out(skb);
399 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
401 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
404 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
405 int type, struct igmpv3_grec **ppgr)
407 struct net_device *dev = pmc->interface->dev;
408 struct igmpv3_report *pih;
409 struct igmpv3_grec *pgr;
412 skb = igmpv3_newpack(dev, dev->mtu);
415 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
416 pgr->grec_type = type;
417 pgr->grec_auxwords = 0;
419 pgr->grec_mca = pmc->multiaddr;
420 pih = igmpv3_report_hdr(skb);
421 pih->ngrec = htons(ntohs(pih->ngrec)+1);
426 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
428 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
429 int type, int gdeleted, int sdeleted)
431 struct net_device *dev = pmc->interface->dev;
432 struct igmpv3_report *pih;
433 struct igmpv3_grec *pgr = NULL;
434 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
435 int scount, stotal, first, isquery, truncate;
437 if (pmc->multiaddr == IGMP_ALL_HOSTS)
440 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
441 type == IGMPV3_MODE_IS_EXCLUDE;
442 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
443 type == IGMPV3_CHANGE_TO_EXCLUDE;
447 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
452 pih = skb ? igmpv3_report_hdr(skb) : NULL;
454 /* EX and TO_EX get a fresh packet, if needed */
456 if (pih && pih->ngrec &&
457 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
459 igmpv3_sendpack(skb);
460 skb = igmpv3_newpack(dev, dev->mtu);
465 for (psf = *psf_list; psf; psf = psf_next) {
468 psf_next = psf->sf_next;
470 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
475 /* clear marks on query responses */
479 if (AVAILABLE(skb) < sizeof(__be32) +
480 first*sizeof(struct igmpv3_grec)) {
481 if (truncate && !first)
482 break; /* truncate these */
484 pgr->grec_nsrcs = htons(scount);
486 igmpv3_sendpack(skb);
487 skb = igmpv3_newpack(dev, dev->mtu);
492 skb = add_grhead(skb, pmc, type, &pgr);
497 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
498 *psrc = psf->sf_inaddr;
500 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
501 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
503 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
505 psf_prev->sf_next = psf->sf_next;
507 *psf_list = psf->sf_next;
517 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
518 type == IGMPV3_BLOCK_OLD_SOURCES)
520 if (pmc->crcount || isquery) {
521 /* make sure we have room for group header */
522 if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) {
523 igmpv3_sendpack(skb);
524 skb = NULL; /* add_grhead will get a new one */
526 skb = add_grhead(skb, pmc, type, &pgr);
530 pgr->grec_nsrcs = htons(scount);
533 pmc->gsquery = 0; /* clear query state on report */
537 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
539 struct sk_buff *skb = NULL;
544 for_each_pmc_rcu(in_dev, pmc) {
545 if (pmc->multiaddr == IGMP_ALL_HOSTS)
547 spin_lock_bh(&pmc->lock);
548 if (pmc->sfcount[MCAST_EXCLUDE])
549 type = IGMPV3_MODE_IS_EXCLUDE;
551 type = IGMPV3_MODE_IS_INCLUDE;
552 skb = add_grec(skb, pmc, type, 0, 0);
553 spin_unlock_bh(&pmc->lock);
557 spin_lock_bh(&pmc->lock);
558 if (pmc->sfcount[MCAST_EXCLUDE])
559 type = IGMPV3_MODE_IS_EXCLUDE;
561 type = IGMPV3_MODE_IS_INCLUDE;
562 skb = add_grec(skb, pmc, type, 0, 0);
563 spin_unlock_bh(&pmc->lock);
567 return igmpv3_sendpack(skb);
571 * remove zero-count source records from a source filter list
573 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
575 struct ip_sf_list *psf_prev, *psf_next, *psf;
578 for (psf = *ppsf; psf; psf = psf_next) {
579 psf_next = psf->sf_next;
580 if (psf->sf_crcount == 0) {
582 psf_prev->sf_next = psf->sf_next;
584 *ppsf = psf->sf_next;
591 static void igmpv3_send_cr(struct in_device *in_dev)
593 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
594 struct sk_buff *skb = NULL;
598 spin_lock_bh(&in_dev->mc_tomb_lock);
602 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) {
603 pmc_next = pmc->next;
604 if (pmc->sfmode == MCAST_INCLUDE) {
605 type = IGMPV3_BLOCK_OLD_SOURCES;
606 dtype = IGMPV3_BLOCK_OLD_SOURCES;
607 skb = add_grec(skb, pmc, type, 1, 0);
608 skb = add_grec(skb, pmc, dtype, 1, 1);
611 if (pmc->sfmode == MCAST_EXCLUDE) {
612 type = IGMPV3_CHANGE_TO_INCLUDE;
613 skb = add_grec(skb, pmc, type, 1, 0);
616 if (pmc->crcount == 0) {
617 igmpv3_clear_zeros(&pmc->tomb);
618 igmpv3_clear_zeros(&pmc->sources);
621 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
623 pmc_prev->next = pmc_next;
625 in_dev->mc_tomb = pmc_next;
626 in_dev_put(pmc->interface);
631 spin_unlock_bh(&in_dev->mc_tomb_lock);
634 for_each_pmc_rcu(in_dev, pmc) {
635 spin_lock_bh(&pmc->lock);
636 if (pmc->sfcount[MCAST_EXCLUDE]) {
637 type = IGMPV3_BLOCK_OLD_SOURCES;
638 dtype = IGMPV3_ALLOW_NEW_SOURCES;
640 type = IGMPV3_ALLOW_NEW_SOURCES;
641 dtype = IGMPV3_BLOCK_OLD_SOURCES;
643 skb = add_grec(skb, pmc, type, 0, 0);
644 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
646 /* filter mode changes */
648 if (pmc->sfmode == MCAST_EXCLUDE)
649 type = IGMPV3_CHANGE_TO_EXCLUDE;
651 type = IGMPV3_CHANGE_TO_INCLUDE;
652 skb = add_grec(skb, pmc, type, 0, 0);
655 spin_unlock_bh(&pmc->lock);
661 (void) igmpv3_sendpack(skb);
664 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
671 struct net_device *dev = in_dev->dev;
672 struct net *net = dev_net(dev);
673 __be32 group = pmc ? pmc->multiaddr : 0;
678 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
679 return igmpv3_send_report(in_dev, pmc);
680 else if (type == IGMP_HOST_LEAVE_MESSAGE)
681 dst = IGMP_ALL_ROUTER;
685 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
687 IPPROTO_IGMP, 0, dev->ifindex);
691 hlen = LL_RESERVED_SPACE(dev);
692 tlen = dev->needed_tailroom;
693 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
698 skb->priority = TC_PRIO_CONTROL;
700 skb_dst_set(skb, &rt->dst);
702 skb_reserve(skb, hlen);
704 skb_reset_network_header(skb);
706 skb_put(skb, sizeof(struct iphdr) + 4);
709 iph->ihl = (sizeof(struct iphdr)+4)>>2;
711 iph->frag_off = htons(IP_DF);
714 iph->saddr = fl4.saddr;
715 iph->protocol = IPPROTO_IGMP;
716 ip_select_ident(skb, NULL);
717 ((u8 *)&iph[1])[0] = IPOPT_RA;
718 ((u8 *)&iph[1])[1] = 4;
719 ((u8 *)&iph[1])[2] = 0;
720 ((u8 *)&iph[1])[3] = 0;
722 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
727 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
729 return ip_local_out(skb);
732 static void igmp_gq_timer_expire(unsigned long data)
734 struct in_device *in_dev = (struct in_device *)data;
736 in_dev->mr_gq_running = 0;
737 igmpv3_send_report(in_dev, NULL);
741 static void igmp_ifc_timer_expire(unsigned long data)
743 struct in_device *in_dev = (struct in_device *)data;
745 igmpv3_send_cr(in_dev);
746 if (in_dev->mr_ifc_count) {
747 in_dev->mr_ifc_count--;
748 igmp_ifc_start_timer(in_dev,
749 unsolicited_report_interval(in_dev));
754 static void igmp_ifc_event(struct in_device *in_dev)
756 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
758 in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv;
759 igmp_ifc_start_timer(in_dev, 1);
763 static void igmp_timer_expire(unsigned long data)
765 struct ip_mc_list *im = (struct ip_mc_list *)data;
766 struct in_device *in_dev = im->interface;
768 spin_lock(&im->lock);
771 if (im->unsolicit_count) {
772 im->unsolicit_count--;
773 igmp_start_timer(im, unsolicited_report_interval(in_dev));
776 spin_unlock(&im->lock);
778 if (IGMP_V1_SEEN(in_dev))
779 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
780 else if (IGMP_V2_SEEN(in_dev))
781 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
783 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
788 /* mark EXCLUDE-mode sources */
789 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
791 struct ip_sf_list *psf;
795 for (psf = pmc->sources; psf; psf = psf->sf_next) {
798 for (i = 0; i < nsrcs; i++) {
799 /* skip inactive filters */
800 if (psf->sf_count[MCAST_INCLUDE] ||
801 pmc->sfcount[MCAST_EXCLUDE] !=
802 psf->sf_count[MCAST_EXCLUDE])
804 if (srcs[i] == psf->sf_inaddr) {
811 if (scount == nsrcs) /* all sources excluded */
816 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
818 struct ip_sf_list *psf;
821 if (pmc->sfmode == MCAST_EXCLUDE)
822 return igmp_xmarksources(pmc, nsrcs, srcs);
824 /* mark INCLUDE-mode sources */
826 for (psf = pmc->sources; psf; psf = psf->sf_next) {
829 for (i = 0; i < nsrcs; i++)
830 if (srcs[i] == psf->sf_inaddr) {
844 /* return true if packet was dropped */
845 static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
847 struct ip_mc_list *im;
849 /* Timers are only set for non-local groups */
851 if (group == IGMP_ALL_HOSTS)
855 for_each_pmc_rcu(in_dev, im) {
856 if (im->multiaddr == group) {
865 /* return true if packet was dropped */
866 static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
869 struct igmphdr *ih = igmp_hdr(skb);
870 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
871 struct ip_mc_list *im;
872 __be32 group = ih->group;
879 /* Alas, old v1 router presents here. */
881 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
882 in_dev->mr_v1_seen = jiffies +
883 IGMP_V1_ROUTER_PRESENT_TIMEOUT;
886 /* v2 router present */
887 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
888 in_dev->mr_v2_seen = jiffies +
889 IGMP_V2_ROUTER_PRESENT_TIMEOUT;
891 /* cancel the interface change timer */
892 in_dev->mr_ifc_count = 0;
893 if (del_timer(&in_dev->mr_ifc_timer))
894 __in_dev_put(in_dev);
895 /* clear deleted report items */
896 igmpv3_clear_delrec(in_dev);
897 } else if (len < 12) {
898 return true; /* ignore bogus packet; freed by caller */
899 } else if (IGMP_V1_SEEN(in_dev)) {
900 /* This is a v3 query with v1 queriers present */
901 max_delay = IGMP_QUERY_RESPONSE_INTERVAL;
903 } else if (IGMP_V2_SEEN(in_dev)) {
904 /* this is a v3 query with v2 queriers present;
905 * Interpretation of the max_delay code is problematic here.
906 * A real v2 host would use ih_code directly, while v3 has a
907 * different encoding. We use the v3 encoding as more likely
908 * to be intended in a v3 query.
910 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
912 max_delay = 1; /* can't mod w/ 0 */
914 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
917 ih3 = igmpv3_query_hdr(skb);
919 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
920 + ntohs(ih3->nsrcs)*sizeof(__be32)))
922 ih3 = igmpv3_query_hdr(skb);
925 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
927 max_delay = 1; /* can't mod w/ 0 */
928 in_dev->mr_maxdelay = max_delay;
930 in_dev->mr_qrv = ih3->qrv;
931 if (!group) { /* general query */
933 return true; /* no sources allowed */
934 igmp_gq_start_timer(in_dev);
937 /* mark sources to include, if group & source-specific */
938 mark = ih3->nsrcs != 0;
942 * - Start the timers in all of our membership records
943 * that the query applies to for the interface on
944 * which the query arrived excl. those that belong
945 * to a "local" group (224.0.0.X)
946 * - For timers already running check if they need to
948 * - Use the igmp->igmp_code field as the maximum
952 for_each_pmc_rcu(in_dev, im) {
955 if (group && group != im->multiaddr)
957 if (im->multiaddr == IGMP_ALL_HOSTS)
959 spin_lock_bh(&im->lock);
961 im->gsquery = im->gsquery && mark;
964 changed = !im->gsquery ||
965 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
966 spin_unlock_bh(&im->lock);
968 igmp_mod_timer(im, max_delay);
974 /* called in rcu_read_lock() section */
975 int igmp_rcv(struct sk_buff *skb)
977 /* This basically follows the spec line by line -- see RFC1112 */
979 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
986 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
989 if (skb_checksum_simple_validate(skb))
994 case IGMP_HOST_MEMBERSHIP_QUERY:
995 dropped = igmp_heard_query(in_dev, skb, len);
997 case IGMP_HOST_MEMBERSHIP_REPORT:
998 case IGMPV2_HOST_MEMBERSHIP_REPORT:
999 /* Is it our report looped back? */
1000 if (rt_is_output_route(skb_rtable(skb)))
1002 /* don't rely on MC router hearing unicast reports */
1003 if (skb->pkt_type == PACKET_MULTICAST ||
1004 skb->pkt_type == PACKET_BROADCAST)
1005 dropped = igmp_heard_report(in_dev, ih->group);
1008 #ifdef CONFIG_IP_PIMSM_V1
1009 return pim_rcv_v1(skb);
1011 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1014 case IGMP_HOST_LEAVE_MESSAGE:
1016 case IGMP_MTRACE_RESP:
1034 * Add a filter to a device
1037 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1039 char buf[MAX_ADDR_LEN];
1040 struct net_device *dev = in_dev->dev;
1042 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1043 We will get multicast token leakage, when IFF_MULTICAST
1044 is changed. This check should be done in ndo_set_rx_mode
1045 routine. Something sort of:
1046 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1049 if (arp_mc_map(addr, buf, dev, 0) == 0)
1050 dev_mc_add(dev, buf);
1054 * Remove a filter from a device
1057 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1059 char buf[MAX_ADDR_LEN];
1060 struct net_device *dev = in_dev->dev;
1062 if (arp_mc_map(addr, buf, dev, 0) == 0)
1063 dev_mc_del(dev, buf);
1066 #ifdef CONFIG_IP_MULTICAST
1068 * deleted ip_mc_list manipulation
1070 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1072 struct ip_mc_list *pmc;
1074 /* this is an "ip_mc_list" for convenience; only the fields below
1075 * are actually used. In particular, the refcnt and users are not
1076 * used for management of the delete list. Using the same structure
1077 * for deleted items allows change reports to use common code with
1078 * non-deleted or query-response MCA's.
1080 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1083 spin_lock_bh(&im->lock);
1084 pmc->interface = im->interface;
1085 in_dev_hold(in_dev);
1086 pmc->multiaddr = im->multiaddr;
1087 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1088 pmc->sfmode = im->sfmode;
1089 if (pmc->sfmode == MCAST_INCLUDE) {
1090 struct ip_sf_list *psf;
1092 pmc->tomb = im->tomb;
1093 pmc->sources = im->sources;
1094 im->tomb = im->sources = NULL;
1095 for (psf = pmc->sources; psf; psf = psf->sf_next)
1096 psf->sf_crcount = pmc->crcount;
1098 spin_unlock_bh(&im->lock);
1100 spin_lock_bh(&in_dev->mc_tomb_lock);
1101 pmc->next = in_dev->mc_tomb;
1102 in_dev->mc_tomb = pmc;
1103 spin_unlock_bh(&in_dev->mc_tomb_lock);
1106 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1108 struct ip_mc_list *pmc, *pmc_prev;
1109 struct ip_sf_list *psf, *psf_next;
1111 spin_lock_bh(&in_dev->mc_tomb_lock);
1113 for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) {
1114 if (pmc->multiaddr == multiaddr)
1120 pmc_prev->next = pmc->next;
1122 in_dev->mc_tomb = pmc->next;
1124 spin_unlock_bh(&in_dev->mc_tomb_lock);
1126 for (psf = pmc->tomb; psf; psf = psf_next) {
1127 psf_next = psf->sf_next;
1130 in_dev_put(pmc->interface);
1135 static void igmpv3_clear_delrec(struct in_device *in_dev)
1137 struct ip_mc_list *pmc, *nextpmc;
1139 spin_lock_bh(&in_dev->mc_tomb_lock);
1140 pmc = in_dev->mc_tomb;
1141 in_dev->mc_tomb = NULL;
1142 spin_unlock_bh(&in_dev->mc_tomb_lock);
1144 for (; pmc; pmc = nextpmc) {
1145 nextpmc = pmc->next;
1146 ip_mc_clear_src(pmc);
1147 in_dev_put(pmc->interface);
1150 /* clear dead sources, too */
1152 for_each_pmc_rcu(in_dev, pmc) {
1153 struct ip_sf_list *psf, *psf_next;
1155 spin_lock_bh(&pmc->lock);
1158 spin_unlock_bh(&pmc->lock);
1159 for (; psf; psf = psf_next) {
1160 psf_next = psf->sf_next;
1168 static void igmp_group_dropped(struct ip_mc_list *im)
1170 struct in_device *in_dev = im->interface;
1171 #ifdef CONFIG_IP_MULTICAST
1177 ip_mc_filter_del(in_dev, im->multiaddr);
1180 #ifdef CONFIG_IP_MULTICAST
1181 if (im->multiaddr == IGMP_ALL_HOSTS)
1184 reporter = im->reporter;
1185 igmp_stop_timer(im);
1187 if (!in_dev->dead) {
1188 if (IGMP_V1_SEEN(in_dev))
1190 if (IGMP_V2_SEEN(in_dev)) {
1192 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1196 igmpv3_add_delrec(in_dev, im);
1198 igmp_ifc_event(in_dev);
1203 static void igmp_group_added(struct ip_mc_list *im)
1205 struct in_device *in_dev = im->interface;
1207 if (im->loaded == 0) {
1209 ip_mc_filter_add(in_dev, im->multiaddr);
1212 #ifdef CONFIG_IP_MULTICAST
1213 if (im->multiaddr == IGMP_ALL_HOSTS)
1218 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1219 spin_lock_bh(&im->lock);
1220 igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY);
1221 spin_unlock_bh(&im->lock);
1226 im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1227 igmp_ifc_event(in_dev);
1233 * Multicast list managers
1236 static u32 ip_mc_hash(const struct ip_mc_list *im)
1238 return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG);
1241 static void ip_mc_hash_add(struct in_device *in_dev,
1242 struct ip_mc_list *im)
1244 struct ip_mc_list __rcu **mc_hash;
1247 mc_hash = rtnl_dereference(in_dev->mc_hash);
1249 hash = ip_mc_hash(im);
1250 im->next_hash = mc_hash[hash];
1251 rcu_assign_pointer(mc_hash[hash], im);
1255 /* do not use a hash table for small number of items */
1256 if (in_dev->mc_count < 4)
1259 mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG,
1264 for_each_pmc_rtnl(in_dev, im) {
1265 hash = ip_mc_hash(im);
1266 im->next_hash = mc_hash[hash];
1267 RCU_INIT_POINTER(mc_hash[hash], im);
1270 rcu_assign_pointer(in_dev->mc_hash, mc_hash);
1273 static void ip_mc_hash_remove(struct in_device *in_dev,
1274 struct ip_mc_list *im)
1276 struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash);
1277 struct ip_mc_list *aux;
1281 mc_hash += ip_mc_hash(im);
1282 while ((aux = rtnl_dereference(*mc_hash)) != im)
1283 mc_hash = &aux->next_hash;
1284 *mc_hash = im->next_hash;
1289 * A socket has joined a multicast group on device dev.
1292 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1294 struct ip_mc_list *im;
1298 for_each_pmc_rtnl(in_dev, im) {
1299 if (im->multiaddr == addr) {
1301 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1306 im = kzalloc(sizeof(*im), GFP_KERNEL);
1311 im->interface = in_dev;
1312 in_dev_hold(in_dev);
1313 im->multiaddr = addr;
1314 /* initial mode is (EX, empty) */
1315 im->sfmode = MCAST_EXCLUDE;
1316 im->sfcount[MCAST_EXCLUDE] = 1;
1317 atomic_set(&im->refcnt, 1);
1318 spin_lock_init(&im->lock);
1319 #ifdef CONFIG_IP_MULTICAST
1320 setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im);
1321 im->unsolicit_count = sysctl_igmp_qrv;
1324 im->next_rcu = in_dev->mc_list;
1326 rcu_assign_pointer(in_dev->mc_list, im);
1328 ip_mc_hash_add(in_dev, im);
1330 #ifdef CONFIG_IP_MULTICAST
1331 igmpv3_del_delrec(in_dev, im->multiaddr);
1333 igmp_group_added(im);
1335 ip_rt_multicast_event(in_dev);
1339 EXPORT_SYMBOL(ip_mc_inc_group);
1342 * Resend IGMP JOIN report; used by netdev notifier.
1344 static void ip_mc_rejoin_groups(struct in_device *in_dev)
1346 #ifdef CONFIG_IP_MULTICAST
1347 struct ip_mc_list *im;
1352 for_each_pmc_rtnl(in_dev, im) {
1353 if (im->multiaddr == IGMP_ALL_HOSTS)
1356 /* a failover is happening and switches
1357 * must be notified immediately
1359 if (IGMP_V1_SEEN(in_dev))
1360 type = IGMP_HOST_MEMBERSHIP_REPORT;
1361 else if (IGMP_V2_SEEN(in_dev))
1362 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1364 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1365 igmp_send_report(in_dev, im, type);
1371 * A socket has left a multicast group on device dev
1374 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1376 struct ip_mc_list *i;
1377 struct ip_mc_list __rcu **ip;
1381 for (ip = &in_dev->mc_list;
1382 (i = rtnl_dereference(*ip)) != NULL;
1383 ip = &i->next_rcu) {
1384 if (i->multiaddr == addr) {
1385 if (--i->users == 0) {
1386 ip_mc_hash_remove(in_dev, i);
1389 igmp_group_dropped(i);
1393 ip_rt_multicast_event(in_dev);
1402 EXPORT_SYMBOL(ip_mc_dec_group);
1404 /* Device changing type */
1406 void ip_mc_unmap(struct in_device *in_dev)
1408 struct ip_mc_list *pmc;
1412 for_each_pmc_rtnl(in_dev, pmc)
1413 igmp_group_dropped(pmc);
1416 void ip_mc_remap(struct in_device *in_dev)
1418 struct ip_mc_list *pmc;
1422 for_each_pmc_rtnl(in_dev, pmc)
1423 igmp_group_added(pmc);
1426 /* Device going down */
1428 void ip_mc_down(struct in_device *in_dev)
1430 struct ip_mc_list *pmc;
1434 for_each_pmc_rtnl(in_dev, pmc)
1435 igmp_group_dropped(pmc);
1437 #ifdef CONFIG_IP_MULTICAST
1438 in_dev->mr_ifc_count = 0;
1439 if (del_timer(&in_dev->mr_ifc_timer))
1440 __in_dev_put(in_dev);
1441 in_dev->mr_gq_running = 0;
1442 if (del_timer(&in_dev->mr_gq_timer))
1443 __in_dev_put(in_dev);
1444 igmpv3_clear_delrec(in_dev);
1447 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1450 void ip_mc_init_dev(struct in_device *in_dev)
1454 #ifdef CONFIG_IP_MULTICAST
1455 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1456 (unsigned long)in_dev);
1457 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1458 (unsigned long)in_dev);
1459 in_dev->mr_qrv = sysctl_igmp_qrv;
1462 spin_lock_init(&in_dev->mc_tomb_lock);
1465 /* Device going up */
1467 void ip_mc_up(struct in_device *in_dev)
1469 struct ip_mc_list *pmc;
1473 #ifdef CONFIG_IP_MULTICAST
1474 in_dev->mr_qrv = sysctl_igmp_qrv;
1476 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1478 for_each_pmc_rtnl(in_dev, pmc)
1479 igmp_group_added(pmc);
1483 * Device is about to be destroyed: clean up.
1486 void ip_mc_destroy_dev(struct in_device *in_dev)
1488 struct ip_mc_list *i;
1492 /* Deactivate timers */
1495 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1496 in_dev->mc_list = i->next_rcu;
1499 /* We've dropped the groups in ip_mc_down already */
1505 /* RTNL is locked */
1506 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1508 struct net_device *dev = NULL;
1509 struct in_device *idev = NULL;
1511 if (imr->imr_ifindex) {
1512 idev = inetdev_by_index(net, imr->imr_ifindex);
1515 if (imr->imr_address.s_addr) {
1516 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1522 struct rtable *rt = ip_route_output(net,
1523 imr->imr_multiaddr.s_addr,
1531 imr->imr_ifindex = dev->ifindex;
1532 idev = __in_dev_get_rtnl(dev);
1538 * Join a socket to a group
1540 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1541 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1542 #ifdef CONFIG_IP_MULTICAST
1543 int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE;
1546 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1549 struct ip_sf_list *psf, *psf_prev;
1553 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1554 if (psf->sf_inaddr == *psfsrc)
1558 if (!psf || psf->sf_count[sfmode] == 0) {
1559 /* source filter not found, or count wrong => bug */
1562 psf->sf_count[sfmode]--;
1563 if (psf->sf_count[sfmode] == 0) {
1564 ip_rt_multicast_event(pmc->interface);
1566 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1567 #ifdef CONFIG_IP_MULTICAST
1568 struct in_device *in_dev = pmc->interface;
1571 /* no more filters for this source */
1573 psf_prev->sf_next = psf->sf_next;
1575 pmc->sources = psf->sf_next;
1576 #ifdef CONFIG_IP_MULTICAST
1577 if (psf->sf_oldin &&
1578 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1579 psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1580 psf->sf_next = pmc->tomb;
1590 #ifndef CONFIG_IP_MULTICAST
1591 #define igmp_ifc_event(x) do { } while (0)
1594 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1595 int sfcount, __be32 *psfsrc, int delta)
1597 struct ip_mc_list *pmc;
1604 for_each_pmc_rcu(in_dev, pmc) {
1605 if (*pmca == pmc->multiaddr)
1609 /* MCA not found?? bug */
1613 spin_lock_bh(&pmc->lock);
1615 #ifdef CONFIG_IP_MULTICAST
1620 if (!pmc->sfcount[sfmode])
1622 pmc->sfcount[sfmode]--;
1625 for (i = 0; i < sfcount; i++) {
1626 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1628 changerec |= rv > 0;
1632 if (pmc->sfmode == MCAST_EXCLUDE &&
1633 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1634 pmc->sfcount[MCAST_INCLUDE]) {
1635 #ifdef CONFIG_IP_MULTICAST
1636 struct ip_sf_list *psf;
1639 /* filter mode change */
1640 pmc->sfmode = MCAST_INCLUDE;
1641 #ifdef CONFIG_IP_MULTICAST
1642 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1643 in_dev->mr_ifc_count = pmc->crcount;
1644 for (psf = pmc->sources; psf; psf = psf->sf_next)
1645 psf->sf_crcount = 0;
1646 igmp_ifc_event(pmc->interface);
1647 } else if (sf_setstate(pmc) || changerec) {
1648 igmp_ifc_event(pmc->interface);
1652 spin_unlock_bh(&pmc->lock);
1657 * Add multicast single-source filter to the interface list
1659 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1662 struct ip_sf_list *psf, *psf_prev;
1665 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1666 if (psf->sf_inaddr == *psfsrc)
1671 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1674 psf->sf_inaddr = *psfsrc;
1676 psf_prev->sf_next = psf;
1680 psf->sf_count[sfmode]++;
1681 if (psf->sf_count[sfmode] == 1) {
1682 ip_rt_multicast_event(pmc->interface);
1687 #ifdef CONFIG_IP_MULTICAST
1688 static void sf_markstate(struct ip_mc_list *pmc)
1690 struct ip_sf_list *psf;
1691 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1693 for (psf = pmc->sources; psf; psf = psf->sf_next)
1694 if (pmc->sfcount[MCAST_EXCLUDE]) {
1695 psf->sf_oldin = mca_xcount ==
1696 psf->sf_count[MCAST_EXCLUDE] &&
1697 !psf->sf_count[MCAST_INCLUDE];
1699 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1702 static int sf_setstate(struct ip_mc_list *pmc)
1704 struct ip_sf_list *psf, *dpsf;
1705 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1706 int qrv = pmc->interface->mr_qrv;
1710 for (psf = pmc->sources; psf; psf = psf->sf_next) {
1711 if (pmc->sfcount[MCAST_EXCLUDE]) {
1712 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1713 !psf->sf_count[MCAST_INCLUDE];
1715 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1717 if (!psf->sf_oldin) {
1718 struct ip_sf_list *prev = NULL;
1720 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) {
1721 if (dpsf->sf_inaddr == psf->sf_inaddr)
1727 prev->sf_next = dpsf->sf_next;
1729 pmc->tomb = dpsf->sf_next;
1732 psf->sf_crcount = qrv;
1735 } else if (psf->sf_oldin) {
1737 psf->sf_crcount = 0;
1739 * add or update "delete" records if an active filter
1742 for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next)
1743 if (dpsf->sf_inaddr == psf->sf_inaddr)
1746 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1750 /* pmc->lock held by callers */
1751 dpsf->sf_next = pmc->tomb;
1754 dpsf->sf_crcount = qrv;
1763 * Add multicast source filter list to the interface list
1765 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1766 int sfcount, __be32 *psfsrc, int delta)
1768 struct ip_mc_list *pmc;
1775 for_each_pmc_rcu(in_dev, pmc) {
1776 if (*pmca == pmc->multiaddr)
1780 /* MCA not found?? bug */
1784 spin_lock_bh(&pmc->lock);
1787 #ifdef CONFIG_IP_MULTICAST
1790 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1792 pmc->sfcount[sfmode]++;
1794 for (i = 0; i < sfcount; i++) {
1795 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
1803 pmc->sfcount[sfmode]--;
1804 for (j = 0; j < i; j++)
1805 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1806 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1807 #ifdef CONFIG_IP_MULTICAST
1808 struct ip_sf_list *psf;
1809 in_dev = pmc->interface;
1812 /* filter mode change */
1813 if (pmc->sfcount[MCAST_EXCLUDE])
1814 pmc->sfmode = MCAST_EXCLUDE;
1815 else if (pmc->sfcount[MCAST_INCLUDE])
1816 pmc->sfmode = MCAST_INCLUDE;
1817 #ifdef CONFIG_IP_MULTICAST
1818 /* else no filters; keep old mode for reports */
1820 pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv;
1821 in_dev->mr_ifc_count = pmc->crcount;
1822 for (psf = pmc->sources; psf; psf = psf->sf_next)
1823 psf->sf_crcount = 0;
1824 igmp_ifc_event(in_dev);
1825 } else if (sf_setstate(pmc)) {
1826 igmp_ifc_event(in_dev);
1829 spin_unlock_bh(&pmc->lock);
1833 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1835 struct ip_sf_list *psf, *nextpsf;
1837 for (psf = pmc->tomb; psf; psf = nextpsf) {
1838 nextpsf = psf->sf_next;
1842 for (psf = pmc->sources; psf; psf = nextpsf) {
1843 nextpsf = psf->sf_next;
1846 pmc->sources = NULL;
1847 pmc->sfmode = MCAST_EXCLUDE;
1848 pmc->sfcount[MCAST_INCLUDE] = 0;
1849 pmc->sfcount[MCAST_EXCLUDE] = 1;
1852 int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
1854 __be32 addr = imr->imr_multiaddr.s_addr;
1855 struct ip_mc_socklist *iml, *i;
1856 struct in_device *in_dev;
1857 struct inet_sock *inet = inet_sk(sk);
1858 struct net *net = sock_net(sk);
1865 if (!ipv4_is_multicast(addr))
1868 in_dev = ip_mc_find_dev(net, imr);
1876 ifindex = imr->imr_ifindex;
1877 for_each_pmc_rtnl(inet, i) {
1878 if (i->multi.imr_multiaddr.s_addr == addr &&
1879 i->multi.imr_ifindex == ifindex)
1884 if (count >= sysctl_igmp_max_memberships)
1886 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1890 memcpy(&iml->multi, imr, sizeof(*imr));
1891 iml->next_rcu = inet->mc_list;
1893 iml->sfmode = MCAST_EXCLUDE;
1894 rcu_assign_pointer(inet->mc_list, iml);
1895 ip_mc_inc_group(in_dev, addr);
1900 EXPORT_SYMBOL(__ip_mc_join_group);
1902 /* Join a multicast group
1904 int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
1909 ret = __ip_mc_join_group(sk, imr);
1914 EXPORT_SYMBOL(ip_mc_join_group);
1916 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1917 struct in_device *in_dev)
1919 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1923 /* any-source empty exclude case */
1924 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1925 iml->sfmode, 0, NULL, 0);
1927 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1928 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1929 RCU_INIT_POINTER(iml->sflist, NULL);
1930 /* decrease mem now to avoid the memleak warning */
1931 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1932 kfree_rcu(psf, rcu);
1936 int __ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1938 struct inet_sock *inet = inet_sk(sk);
1939 struct ip_mc_socklist *iml;
1940 struct ip_mc_socklist __rcu **imlp;
1941 struct in_device *in_dev;
1942 struct net *net = sock_net(sk);
1943 __be32 group = imr->imr_multiaddr.s_addr;
1945 int ret = -EADDRNOTAVAIL;
1949 in_dev = ip_mc_find_dev(net, imr);
1954 ifindex = imr->imr_ifindex;
1955 for (imlp = &inet->mc_list;
1956 (iml = rtnl_dereference(*imlp)) != NULL;
1957 imlp = &iml->next_rcu) {
1958 if (iml->multi.imr_multiaddr.s_addr != group)
1961 if (iml->multi.imr_ifindex != ifindex)
1963 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1964 iml->multi.imr_address.s_addr)
1967 (void) ip_mc_leave_src(sk, iml, in_dev);
1969 *imlp = iml->next_rcu;
1971 ip_mc_dec_group(in_dev, group);
1973 /* decrease mem now to avoid the memleak warning */
1974 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1975 kfree_rcu(iml, rcu);
1981 EXPORT_SYMBOL(__ip_mc_leave_group);
1983 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1988 ret = __ip_mc_leave_group(sk, imr);
1993 EXPORT_SYMBOL(ip_mc_leave_group);
1995 int ip_mc_source(int add, int omode, struct sock *sk, struct
1996 ip_mreq_source *mreqs, int ifindex)
1999 struct ip_mreqn imr;
2000 __be32 addr = mreqs->imr_multiaddr;
2001 struct ip_mc_socklist *pmc;
2002 struct in_device *in_dev = NULL;
2003 struct inet_sock *inet = inet_sk(sk);
2004 struct ip_sf_socklist *psl;
2005 struct net *net = sock_net(sk);
2009 if (!ipv4_is_multicast(addr))
2014 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
2015 imr.imr_address.s_addr = mreqs->imr_interface;
2016 imr.imr_ifindex = ifindex;
2017 in_dev = ip_mc_find_dev(net, &imr);
2023 err = -EADDRNOTAVAIL;
2025 for_each_pmc_rtnl(inet, pmc) {
2026 if ((pmc->multi.imr_multiaddr.s_addr ==
2027 imr.imr_multiaddr.s_addr) &&
2028 (pmc->multi.imr_ifindex == imr.imr_ifindex))
2031 if (!pmc) { /* must have a prior join */
2035 /* if a source filter was set, must be the same mode as before */
2037 if (pmc->sfmode != omode) {
2041 } else if (pmc->sfmode != omode) {
2042 /* allow mode switches for empty-set filters */
2043 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
2044 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
2046 pmc->sfmode = omode;
2049 psl = rtnl_dereference(pmc->sflist);
2052 goto done; /* err = -EADDRNOTAVAIL */
2054 for (i = 0; i < psl->sl_count; i++) {
2055 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2060 if (rv) /* source not found */
2061 goto done; /* err = -EADDRNOTAVAIL */
2063 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2064 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2069 /* update the interface filter */
2070 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2071 &mreqs->imr_sourceaddr, 1);
2073 for (j = i+1; j < psl->sl_count; j++)
2074 psl->sl_addr[j-1] = psl->sl_addr[j];
2079 /* else, add a new source to the filter */
2081 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2085 if (!psl || psl->sl_count == psl->sl_max) {
2086 struct ip_sf_socklist *newpsl;
2087 int count = IP_SFBLOCK;
2090 count += psl->sl_max;
2091 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2096 newpsl->sl_max = count;
2097 newpsl->sl_count = count - IP_SFBLOCK;
2099 for (i = 0; i < psl->sl_count; i++)
2100 newpsl->sl_addr[i] = psl->sl_addr[i];
2101 /* decrease mem now to avoid the memleak warning */
2102 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2103 kfree_rcu(psl, rcu);
2105 rcu_assign_pointer(pmc->sflist, newpsl);
2108 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2109 for (i = 0; i < psl->sl_count; i++) {
2110 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2115 if (rv == 0) /* address already there is an error */
2117 for (j = psl->sl_count-1; j >= i; j--)
2118 psl->sl_addr[j+1] = psl->sl_addr[j];
2119 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2122 /* update the interface list */
2123 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2124 &mreqs->imr_sourceaddr, 1);
2128 return ip_mc_leave_group(sk, &imr);
2132 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2135 struct ip_mreqn imr;
2136 __be32 addr = msf->imsf_multiaddr;
2137 struct ip_mc_socklist *pmc;
2138 struct in_device *in_dev;
2139 struct inet_sock *inet = inet_sk(sk);
2140 struct ip_sf_socklist *newpsl, *psl;
2141 struct net *net = sock_net(sk);
2144 if (!ipv4_is_multicast(addr))
2146 if (msf->imsf_fmode != MCAST_INCLUDE &&
2147 msf->imsf_fmode != MCAST_EXCLUDE)
2152 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2153 imr.imr_address.s_addr = msf->imsf_interface;
2154 imr.imr_ifindex = ifindex;
2155 in_dev = ip_mc_find_dev(net, &imr);
2162 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2163 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2168 for_each_pmc_rtnl(inet, pmc) {
2169 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2170 pmc->multi.imr_ifindex == imr.imr_ifindex)
2173 if (!pmc) { /* must have a prior join */
2177 if (msf->imsf_numsrc) {
2178 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2184 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2185 memcpy(newpsl->sl_addr, msf->imsf_slist,
2186 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2187 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2188 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2190 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2195 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2196 msf->imsf_fmode, 0, NULL, 0);
2198 psl = rtnl_dereference(pmc->sflist);
2200 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2201 psl->sl_count, psl->sl_addr, 0);
2202 /* decrease mem now to avoid the memleak warning */
2203 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2204 kfree_rcu(psl, rcu);
2206 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2208 rcu_assign_pointer(pmc->sflist, newpsl);
2209 pmc->sfmode = msf->imsf_fmode;
2214 err = ip_mc_leave_group(sk, &imr);
2218 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2219 struct ip_msfilter __user *optval, int __user *optlen)
2221 int err, len, count, copycount;
2222 struct ip_mreqn imr;
2223 __be32 addr = msf->imsf_multiaddr;
2224 struct ip_mc_socklist *pmc;
2225 struct in_device *in_dev;
2226 struct inet_sock *inet = inet_sk(sk);
2227 struct ip_sf_socklist *psl;
2228 struct net *net = sock_net(sk);
2230 if (!ipv4_is_multicast(addr))
2235 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2236 imr.imr_address.s_addr = msf->imsf_interface;
2237 imr.imr_ifindex = 0;
2238 in_dev = ip_mc_find_dev(net, &imr);
2244 err = -EADDRNOTAVAIL;
2246 for_each_pmc_rtnl(inet, pmc) {
2247 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2248 pmc->multi.imr_ifindex == imr.imr_ifindex)
2251 if (!pmc) /* must have a prior join */
2253 msf->imsf_fmode = pmc->sfmode;
2254 psl = rtnl_dereference(pmc->sflist);
2260 count = psl->sl_count;
2262 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2263 len = copycount * sizeof(psl->sl_addr[0]);
2264 msf->imsf_numsrc = count;
2265 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2266 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2270 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2278 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2279 struct group_filter __user *optval, int __user *optlen)
2281 int err, i, count, copycount;
2282 struct sockaddr_in *psin;
2284 struct ip_mc_socklist *pmc;
2285 struct inet_sock *inet = inet_sk(sk);
2286 struct ip_sf_socklist *psl;
2288 psin = (struct sockaddr_in *)&gsf->gf_group;
2289 if (psin->sin_family != AF_INET)
2291 addr = psin->sin_addr.s_addr;
2292 if (!ipv4_is_multicast(addr))
2297 err = -EADDRNOTAVAIL;
2299 for_each_pmc_rtnl(inet, pmc) {
2300 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2301 pmc->multi.imr_ifindex == gsf->gf_interface)
2304 if (!pmc) /* must have a prior join */
2306 gsf->gf_fmode = pmc->sfmode;
2307 psl = rtnl_dereference(pmc->sflist);
2309 count = psl ? psl->sl_count : 0;
2310 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2311 gsf->gf_numsrc = count;
2312 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2313 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2316 for (i = 0; i < copycount; i++) {
2317 struct sockaddr_storage ss;
2319 psin = (struct sockaddr_in *)&ss;
2320 memset(&ss, 0, sizeof(ss));
2321 psin->sin_family = AF_INET;
2322 psin->sin_addr.s_addr = psl->sl_addr[i];
2323 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2333 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2335 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2337 struct inet_sock *inet = inet_sk(sk);
2338 struct ip_mc_socklist *pmc;
2339 struct ip_sf_socklist *psl;
2344 if (!ipv4_is_multicast(loc_addr))
2348 for_each_pmc_rcu(inet, pmc) {
2349 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2350 pmc->multi.imr_ifindex == dif)
2356 psl = rcu_dereference(pmc->sflist);
2357 ret = (pmc->sfmode == MCAST_EXCLUDE);
2361 for (i = 0; i < psl->sl_count; i++) {
2362 if (psl->sl_addr[i] == rmt_addr)
2366 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2368 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2378 * A socket is closing.
2381 void ip_mc_drop_socket(struct sock *sk)
2383 struct inet_sock *inet = inet_sk(sk);
2384 struct ip_mc_socklist *iml;
2385 struct net *net = sock_net(sk);
2387 if (inet->mc_list == NULL)
2391 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2392 struct in_device *in_dev;
2394 inet->mc_list = iml->next_rcu;
2395 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2396 (void) ip_mc_leave_src(sk, iml, in_dev);
2398 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2399 /* decrease mem now to avoid the memleak warning */
2400 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2401 kfree_rcu(iml, rcu);
2406 /* called with rcu_read_lock() */
2407 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2409 struct ip_mc_list *im;
2410 struct ip_mc_list __rcu **mc_hash;
2411 struct ip_sf_list *psf;
2414 mc_hash = rcu_dereference(in_dev->mc_hash);
2416 u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG);
2418 for (im = rcu_dereference(mc_hash[hash]);
2420 im = rcu_dereference(im->next_hash)) {
2421 if (im->multiaddr == mc_addr)
2425 for_each_pmc_rcu(in_dev, im) {
2426 if (im->multiaddr == mc_addr)
2430 if (im && proto == IPPROTO_IGMP) {
2434 for (psf = im->sources; psf; psf = psf->sf_next) {
2435 if (psf->sf_inaddr == src_addr)
2439 rv = psf->sf_count[MCAST_INCLUDE] ||
2440 psf->sf_count[MCAST_EXCLUDE] !=
2441 im->sfcount[MCAST_EXCLUDE];
2443 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2445 rv = 1; /* unspecified source; tentatively allow */
2450 #if defined(CONFIG_PROC_FS)
2451 struct igmp_mc_iter_state {
2452 struct seq_net_private p;
2453 struct net_device *dev;
2454 struct in_device *in_dev;
2457 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2459 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2461 struct net *net = seq_file_net(seq);
2462 struct ip_mc_list *im = NULL;
2463 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2465 state->in_dev = NULL;
2466 for_each_netdev_rcu(net, state->dev) {
2467 struct in_device *in_dev;
2469 in_dev = __in_dev_get_rcu(state->dev);
2472 im = rcu_dereference(in_dev->mc_list);
2474 state->in_dev = in_dev;
2481 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2483 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2485 im = rcu_dereference(im->next_rcu);
2487 state->dev = next_net_device_rcu(state->dev);
2489 state->in_dev = NULL;
2492 state->in_dev = __in_dev_get_rcu(state->dev);
2495 im = rcu_dereference(state->in_dev->mc_list);
2500 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2502 struct ip_mc_list *im = igmp_mc_get_first(seq);
2504 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2506 return pos ? NULL : im;
2509 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2513 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2516 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2518 struct ip_mc_list *im;
2519 if (v == SEQ_START_TOKEN)
2520 im = igmp_mc_get_first(seq);
2522 im = igmp_mc_get_next(seq, v);
2527 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2530 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2532 state->in_dev = NULL;
2537 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2539 if (v == SEQ_START_TOKEN)
2541 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2543 struct ip_mc_list *im = (struct ip_mc_list *)v;
2544 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2548 #ifdef CONFIG_IP_MULTICAST
2549 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2550 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2556 if (rcu_access_pointer(state->in_dev->mc_list) == im) {
2557 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2558 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2561 delta = im->timer.expires - jiffies;
2563 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2564 im->multiaddr, im->users,
2566 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
2572 static const struct seq_operations igmp_mc_seq_ops = {
2573 .start = igmp_mc_seq_start,
2574 .next = igmp_mc_seq_next,
2575 .stop = igmp_mc_seq_stop,
2576 .show = igmp_mc_seq_show,
2579 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2581 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2582 sizeof(struct igmp_mc_iter_state));
2585 static const struct file_operations igmp_mc_seq_fops = {
2586 .owner = THIS_MODULE,
2587 .open = igmp_mc_seq_open,
2589 .llseek = seq_lseek,
2590 .release = seq_release_net,
2593 struct igmp_mcf_iter_state {
2594 struct seq_net_private p;
2595 struct net_device *dev;
2596 struct in_device *idev;
2597 struct ip_mc_list *im;
2600 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2602 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2604 struct net *net = seq_file_net(seq);
2605 struct ip_sf_list *psf = NULL;
2606 struct ip_mc_list *im = NULL;
2607 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2611 for_each_netdev_rcu(net, state->dev) {
2612 struct in_device *idev;
2613 idev = __in_dev_get_rcu(state->dev);
2614 if (unlikely(idev == NULL))
2616 im = rcu_dereference(idev->mc_list);
2617 if (likely(im != NULL)) {
2618 spin_lock_bh(&im->lock);
2620 if (likely(psf != NULL)) {
2625 spin_unlock_bh(&im->lock);
2631 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2633 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2637 spin_unlock_bh(&state->im->lock);
2638 state->im = state->im->next;
2639 while (!state->im) {
2640 state->dev = next_net_device_rcu(state->dev);
2645 state->idev = __in_dev_get_rcu(state->dev);
2648 state->im = rcu_dereference(state->idev->mc_list);
2652 spin_lock_bh(&state->im->lock);
2653 psf = state->im->sources;
2659 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2661 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2663 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2665 return pos ? NULL : psf;
2668 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2672 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2675 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2677 struct ip_sf_list *psf;
2678 if (v == SEQ_START_TOKEN)
2679 psf = igmp_mcf_get_first(seq);
2681 psf = igmp_mcf_get_next(seq, v);
2686 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2689 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2690 if (likely(state->im != NULL)) {
2691 spin_unlock_bh(&state->im->lock);
2699 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2701 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2702 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2704 if (v == SEQ_START_TOKEN) {
2705 seq_puts(seq, "Idx Device MCA SRC INC EXC\n");
2709 "0x%08x %6lu %6lu\n",
2710 state->dev->ifindex, state->dev->name,
2711 ntohl(state->im->multiaddr),
2712 ntohl(psf->sf_inaddr),
2713 psf->sf_count[MCAST_INCLUDE],
2714 psf->sf_count[MCAST_EXCLUDE]);
2719 static const struct seq_operations igmp_mcf_seq_ops = {
2720 .start = igmp_mcf_seq_start,
2721 .next = igmp_mcf_seq_next,
2722 .stop = igmp_mcf_seq_stop,
2723 .show = igmp_mcf_seq_show,
2726 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2728 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2729 sizeof(struct igmp_mcf_iter_state));
2732 static const struct file_operations igmp_mcf_seq_fops = {
2733 .owner = THIS_MODULE,
2734 .open = igmp_mcf_seq_open,
2736 .llseek = seq_lseek,
2737 .release = seq_release_net,
2740 static int __net_init igmp_net_init(struct net *net)
2742 struct proc_dir_entry *pde;
2744 pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops);
2747 pde = proc_create("mcfilter", S_IRUGO, net->proc_net,
2748 &igmp_mcf_seq_fops);
2754 remove_proc_entry("igmp", net->proc_net);
2759 static void __net_exit igmp_net_exit(struct net *net)
2761 remove_proc_entry("mcfilter", net->proc_net);
2762 remove_proc_entry("igmp", net->proc_net);
2765 static struct pernet_operations igmp_net_ops = {
2766 .init = igmp_net_init,
2767 .exit = igmp_net_exit,
2771 static int igmp_netdev_event(struct notifier_block *this,
2772 unsigned long event, void *ptr)
2774 struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2775 struct in_device *in_dev;
2778 case NETDEV_RESEND_IGMP:
2779 in_dev = __in_dev_get_rtnl(dev);
2781 ip_mc_rejoin_groups(in_dev);
2789 static struct notifier_block igmp_notifier = {
2790 .notifier_call = igmp_netdev_event,
2793 int __init igmp_mc_init(void)
2795 #if defined(CONFIG_PROC_FS)
2798 err = register_pernet_subsys(&igmp_net_ops);
2801 err = register_netdevice_notifier(&igmp_notifier);
2803 goto reg_notif_fail;
2807 unregister_pernet_subsys(&igmp_net_ops);
2810 return register_netdevice_notifier(&igmp_notifier);