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 <asm/system.h>
77 #include <linux/types.h>
78 #include <linux/kernel.h>
79 #include <linux/jiffies.h>
80 #include <linux/string.h>
81 #include <linux/socket.h>
82 #include <linux/sockios.h>
84 #include <linux/inet.h>
85 #include <linux/netdevice.h>
86 #include <linux/skbuff.h>
87 #include <linux/inetdevice.h>
88 #include <linux/igmp.h>
89 #include <linux/if_arp.h>
90 #include <linux/rtnetlink.h>
91 #include <linux/times.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_Unsolicited_Report_Interval (10*HZ)
118 #define IGMP_Query_Response_Interval (10*HZ)
119 #define IGMP_Unsolicited_Report_Count 2
122 #define IGMP_Initial_Report_Delay (1)
124 /* IGMP_Initial_Report_Delay is not from IGMP specs!
125 * IGMP specs require to report membership immediately after
126 * joining a group, but we delay the first report by a
127 * small interval. It seems more natural and still does not
128 * contradict to specs provided this delay is small enough.
131 #define IGMP_V1_SEEN(in_dev) \
132 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
133 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
134 ((in_dev)->mr_v1_seen && \
135 time_before(jiffies, (in_dev)->mr_v1_seen)))
136 #define IGMP_V2_SEEN(in_dev) \
137 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
138 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
139 ((in_dev)->mr_v2_seen && \
140 time_before(jiffies, (in_dev)->mr_v2_seen)))
142 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
143 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
144 static void igmpv3_clear_delrec(struct in_device *in_dev);
145 static int sf_setstate(struct ip_mc_list *pmc);
146 static void sf_markstate(struct ip_mc_list *pmc);
148 static void ip_mc_clear_src(struct ip_mc_list *pmc);
149 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
150 int sfcount, __be32 *psfsrc, int delta);
152 static void ip_ma_put(struct ip_mc_list *im)
154 if (atomic_dec_and_test(&im->refcnt)) {
155 in_dev_put(im->interface);
160 #define for_each_pmc_rcu(in_dev, pmc) \
161 for (pmc = rcu_dereference(in_dev->mc_list); \
163 pmc = rcu_dereference(pmc->next_rcu))
165 #define for_each_pmc_rtnl(in_dev, pmc) \
166 for (pmc = rtnl_dereference(in_dev->mc_list); \
168 pmc = rtnl_dereference(pmc->next_rcu))
170 #ifdef CONFIG_IP_MULTICAST
176 static void igmp_stop_timer(struct ip_mc_list *im)
178 spin_lock_bh(&im->lock);
179 if (del_timer(&im->timer))
180 atomic_dec(&im->refcnt);
183 im->unsolicit_count = 0;
184 spin_unlock_bh(&im->lock);
187 /* It must be called with locked im->lock */
188 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
190 int tv = net_random() % max_delay;
193 if (!mod_timer(&im->timer, jiffies+tv+2))
194 atomic_inc(&im->refcnt);
197 static void igmp_gq_start_timer(struct in_device *in_dev)
199 int tv = net_random() % in_dev->mr_maxdelay;
201 in_dev->mr_gq_running = 1;
202 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
206 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
208 int tv = net_random() % delay;
210 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
214 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
216 spin_lock_bh(&im->lock);
217 im->unsolicit_count = 0;
218 if (del_timer(&im->timer)) {
219 if ((long)(im->timer.expires-jiffies) < max_delay) {
220 add_timer(&im->timer);
222 spin_unlock_bh(&im->lock);
225 atomic_dec(&im->refcnt);
227 igmp_start_timer(im, max_delay);
228 spin_unlock_bh(&im->lock);
233 * Send an IGMP report.
236 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
239 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
240 int gdeleted, int sdeleted)
243 case IGMPV3_MODE_IS_INCLUDE:
244 case IGMPV3_MODE_IS_EXCLUDE:
245 if (gdeleted || sdeleted)
247 if (!(pmc->gsquery && !psf->sf_gsresp)) {
248 if (pmc->sfmode == MCAST_INCLUDE)
250 /* don't include if this source is excluded
253 if (psf->sf_count[MCAST_INCLUDE])
254 return type == IGMPV3_MODE_IS_INCLUDE;
255 return pmc->sfcount[MCAST_EXCLUDE] ==
256 psf->sf_count[MCAST_EXCLUDE];
259 case IGMPV3_CHANGE_TO_INCLUDE:
260 if (gdeleted || sdeleted)
262 return psf->sf_count[MCAST_INCLUDE] != 0;
263 case IGMPV3_CHANGE_TO_EXCLUDE:
264 if (gdeleted || sdeleted)
266 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
267 psf->sf_count[MCAST_INCLUDE])
269 return pmc->sfcount[MCAST_EXCLUDE] ==
270 psf->sf_count[MCAST_EXCLUDE];
271 case IGMPV3_ALLOW_NEW_SOURCES:
272 if (gdeleted || !psf->sf_crcount)
274 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
275 case IGMPV3_BLOCK_OLD_SOURCES:
276 if (pmc->sfmode == MCAST_INCLUDE)
277 return gdeleted || (psf->sf_crcount && sdeleted);
278 return psf->sf_crcount && !gdeleted && !sdeleted;
284 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
286 struct ip_sf_list *psf;
289 for (psf=pmc->sources; psf; psf=psf->sf_next) {
290 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
297 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
302 struct igmpv3_report *pig;
303 struct net *net = dev_net(dev);
305 int hlen = LL_RESERVED_SPACE(dev);
306 int tlen = dev->needed_tailroom;
307 unsigned int size = mtu;
310 skb = alloc_skb(size + hlen + tlen,
311 GFP_ATOMIC | __GFP_NOWARN);
319 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
321 IPPROTO_IGMP, 0, dev->ifindex);
327 skb_dst_set(skb, &rt->dst);
330 skb_reserve(skb, hlen);
331 skb_tailroom_reserve(skb, mtu, tlen);
333 skb_reset_network_header(skb);
335 skb_put(skb, sizeof(struct iphdr) + 4);
338 pip->ihl = (sizeof(struct iphdr)+4)>>2;
340 pip->frag_off = htons(IP_DF);
342 pip->daddr = fl4.daddr;
343 pip->saddr = fl4.saddr;
344 pip->protocol = IPPROTO_IGMP;
345 pip->tot_len = 0; /* filled in later */
346 ip_select_ident(skb, NULL);
347 ((u8*)&pip[1])[0] = IPOPT_RA;
348 ((u8*)&pip[1])[1] = 4;
349 ((u8*)&pip[1])[2] = 0;
350 ((u8*)&pip[1])[3] = 0;
352 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
353 skb_put(skb, sizeof(*pig));
354 pig = igmpv3_report_hdr(skb);
355 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
363 static int igmpv3_sendpack(struct sk_buff *skb)
365 struct igmphdr *pig = igmp_hdr(skb);
366 const int igmplen = skb->tail - skb->transport_header;
368 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
370 return ip_local_out(skb);
373 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
375 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
378 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
379 int type, struct igmpv3_grec **ppgr)
381 struct net_device *dev = pmc->interface->dev;
382 struct igmpv3_report *pih;
383 struct igmpv3_grec *pgr;
386 skb = igmpv3_newpack(dev, dev->mtu);
389 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
390 pgr->grec_type = type;
391 pgr->grec_auxwords = 0;
393 pgr->grec_mca = pmc->multiaddr;
394 pih = igmpv3_report_hdr(skb);
395 pih->ngrec = htons(ntohs(pih->ngrec)+1);
400 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
402 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
403 int type, int gdeleted, int sdeleted)
405 struct net_device *dev = pmc->interface->dev;
406 struct igmpv3_report *pih;
407 struct igmpv3_grec *pgr = NULL;
408 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
409 int scount, stotal, first, isquery, truncate;
411 if (pmc->multiaddr == IGMP_ALL_HOSTS)
414 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
415 type == IGMPV3_MODE_IS_EXCLUDE;
416 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
417 type == IGMPV3_CHANGE_TO_EXCLUDE;
421 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
426 pih = skb ? igmpv3_report_hdr(skb) : NULL;
428 /* EX and TO_EX get a fresh packet, if needed */
430 if (pih && pih->ngrec &&
431 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
433 igmpv3_sendpack(skb);
434 skb = igmpv3_newpack(dev, dev->mtu);
439 for (psf=*psf_list; psf; psf=psf_next) {
442 psf_next = psf->sf_next;
444 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
449 /* clear marks on query responses */
453 if (AVAILABLE(skb) < sizeof(__be32) +
454 first*sizeof(struct igmpv3_grec)) {
455 if (truncate && !first)
456 break; /* truncate these */
458 pgr->grec_nsrcs = htons(scount);
460 igmpv3_sendpack(skb);
461 skb = igmpv3_newpack(dev, dev->mtu);
466 skb = add_grhead(skb, pmc, type, &pgr);
471 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
472 *psrc = psf->sf_inaddr;
474 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
475 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
477 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
479 psf_prev->sf_next = psf->sf_next;
481 *psf_list = psf->sf_next;
491 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
492 type == IGMPV3_BLOCK_OLD_SOURCES)
494 if (pmc->crcount || isquery) {
495 /* make sure we have room for group header */
496 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
497 igmpv3_sendpack(skb);
498 skb = NULL; /* add_grhead will get a new one */
500 skb = add_grhead(skb, pmc, type, &pgr);
504 pgr->grec_nsrcs = htons(scount);
507 pmc->gsquery = 0; /* clear query state on report */
511 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
513 struct sk_buff *skb = NULL;
518 for_each_pmc_rcu(in_dev, pmc) {
519 if (pmc->multiaddr == IGMP_ALL_HOSTS)
521 spin_lock_bh(&pmc->lock);
522 if (pmc->sfcount[MCAST_EXCLUDE])
523 type = IGMPV3_MODE_IS_EXCLUDE;
525 type = IGMPV3_MODE_IS_INCLUDE;
526 skb = add_grec(skb, pmc, type, 0, 0);
527 spin_unlock_bh(&pmc->lock);
531 spin_lock_bh(&pmc->lock);
532 if (pmc->sfcount[MCAST_EXCLUDE])
533 type = IGMPV3_MODE_IS_EXCLUDE;
535 type = IGMPV3_MODE_IS_INCLUDE;
536 skb = add_grec(skb, pmc, type, 0, 0);
537 spin_unlock_bh(&pmc->lock);
541 return igmpv3_sendpack(skb);
545 * remove zero-count source records from a source filter list
547 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
549 struct ip_sf_list *psf_prev, *psf_next, *psf;
552 for (psf=*ppsf; psf; psf = psf_next) {
553 psf_next = psf->sf_next;
554 if (psf->sf_crcount == 0) {
556 psf_prev->sf_next = psf->sf_next;
558 *ppsf = psf->sf_next;
565 static void igmpv3_send_cr(struct in_device *in_dev)
567 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
568 struct sk_buff *skb = NULL;
572 spin_lock_bh(&in_dev->mc_tomb_lock);
576 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
577 pmc_next = pmc->next;
578 if (pmc->sfmode == MCAST_INCLUDE) {
579 type = IGMPV3_BLOCK_OLD_SOURCES;
580 dtype = IGMPV3_BLOCK_OLD_SOURCES;
581 skb = add_grec(skb, pmc, type, 1, 0);
582 skb = add_grec(skb, pmc, dtype, 1, 1);
585 if (pmc->sfmode == MCAST_EXCLUDE) {
586 type = IGMPV3_CHANGE_TO_INCLUDE;
587 skb = add_grec(skb, pmc, type, 1, 0);
590 if (pmc->crcount == 0) {
591 igmpv3_clear_zeros(&pmc->tomb);
592 igmpv3_clear_zeros(&pmc->sources);
595 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
597 pmc_prev->next = pmc_next;
599 in_dev->mc_tomb = pmc_next;
600 in_dev_put(pmc->interface);
605 spin_unlock_bh(&in_dev->mc_tomb_lock);
608 for_each_pmc_rcu(in_dev, pmc) {
609 spin_lock_bh(&pmc->lock);
610 if (pmc->sfcount[MCAST_EXCLUDE]) {
611 type = IGMPV3_BLOCK_OLD_SOURCES;
612 dtype = IGMPV3_ALLOW_NEW_SOURCES;
614 type = IGMPV3_ALLOW_NEW_SOURCES;
615 dtype = IGMPV3_BLOCK_OLD_SOURCES;
617 skb = add_grec(skb, pmc, type, 0, 0);
618 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
620 /* filter mode changes */
622 if (pmc->sfmode == MCAST_EXCLUDE)
623 type = IGMPV3_CHANGE_TO_EXCLUDE;
625 type = IGMPV3_CHANGE_TO_INCLUDE;
626 skb = add_grec(skb, pmc, type, 0, 0);
629 spin_unlock_bh(&pmc->lock);
635 (void) igmpv3_sendpack(skb);
638 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
645 struct net_device *dev = in_dev->dev;
646 struct net *net = dev_net(dev);
647 __be32 group = pmc ? pmc->multiaddr : 0;
652 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
653 return igmpv3_send_report(in_dev, pmc);
654 else if (type == IGMP_HOST_LEAVE_MESSAGE)
655 dst = IGMP_ALL_ROUTER;
659 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
661 IPPROTO_IGMP, 0, dev->ifindex);
665 hlen = LL_RESERVED_SPACE(dev);
666 tlen = dev->needed_tailroom;
667 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
673 skb_dst_set(skb, &rt->dst);
675 skb_reserve(skb, hlen);
677 skb_reset_network_header(skb);
679 skb_put(skb, sizeof(struct iphdr) + 4);
682 iph->ihl = (sizeof(struct iphdr)+4)>>2;
684 iph->frag_off = htons(IP_DF);
687 iph->saddr = fl4.saddr;
688 iph->protocol = IPPROTO_IGMP;
689 ip_select_ident(skb, NULL);
690 ((u8*)&iph[1])[0] = IPOPT_RA;
691 ((u8*)&iph[1])[1] = 4;
692 ((u8*)&iph[1])[2] = 0;
693 ((u8*)&iph[1])[3] = 0;
695 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
700 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
702 return ip_local_out(skb);
705 static void igmp_gq_timer_expire(unsigned long data)
707 struct in_device *in_dev = (struct in_device *)data;
709 in_dev->mr_gq_running = 0;
710 igmpv3_send_report(in_dev, NULL);
714 static void igmp_ifc_timer_expire(unsigned long data)
716 struct in_device *in_dev = (struct in_device *)data;
718 igmpv3_send_cr(in_dev);
719 if (in_dev->mr_ifc_count) {
720 in_dev->mr_ifc_count--;
721 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
726 static void igmp_ifc_event(struct in_device *in_dev)
728 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
730 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
731 IGMP_Unsolicited_Report_Count;
732 igmp_ifc_start_timer(in_dev, 1);
736 static void igmp_timer_expire(unsigned long data)
738 struct ip_mc_list *im=(struct ip_mc_list *)data;
739 struct in_device *in_dev = im->interface;
741 spin_lock(&im->lock);
744 if (im->unsolicit_count) {
745 im->unsolicit_count--;
746 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
749 spin_unlock(&im->lock);
751 if (IGMP_V1_SEEN(in_dev))
752 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
753 else if (IGMP_V2_SEEN(in_dev))
754 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
756 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
761 /* mark EXCLUDE-mode sources */
762 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
764 struct ip_sf_list *psf;
768 for (psf=pmc->sources; psf; psf=psf->sf_next) {
771 for (i=0; i<nsrcs; i++) {
772 /* skip inactive filters */
773 if (psf->sf_count[MCAST_INCLUDE] ||
774 pmc->sfcount[MCAST_EXCLUDE] !=
775 psf->sf_count[MCAST_EXCLUDE])
777 if (srcs[i] == psf->sf_inaddr) {
784 if (scount == nsrcs) /* all sources excluded */
789 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
791 struct ip_sf_list *psf;
794 if (pmc->sfmode == MCAST_EXCLUDE)
795 return igmp_xmarksources(pmc, nsrcs, srcs);
797 /* mark INCLUDE-mode sources */
799 for (psf=pmc->sources; psf; psf=psf->sf_next) {
802 for (i=0; i<nsrcs; i++)
803 if (srcs[i] == psf->sf_inaddr) {
817 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
819 struct ip_mc_list *im;
821 /* Timers are only set for non-local groups */
823 if (group == IGMP_ALL_HOSTS)
827 for_each_pmc_rcu(in_dev, im) {
828 if (im->multiaddr == group) {
836 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
839 struct igmphdr *ih = igmp_hdr(skb);
840 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
841 struct ip_mc_list *im;
842 __be32 group = ih->group;
849 /* Alas, old v1 router presents here. */
851 max_delay = IGMP_Query_Response_Interval;
852 in_dev->mr_v1_seen = jiffies +
853 IGMP_V1_Router_Present_Timeout;
856 /* v2 router present */
857 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
858 in_dev->mr_v2_seen = jiffies +
859 IGMP_V2_Router_Present_Timeout;
861 /* cancel the interface change timer */
862 in_dev->mr_ifc_count = 0;
863 if (del_timer(&in_dev->mr_ifc_timer))
864 __in_dev_put(in_dev);
865 /* clear deleted report items */
866 igmpv3_clear_delrec(in_dev);
867 } else if (len < 12) {
868 return; /* ignore bogus packet; freed by caller */
869 } else if (IGMP_V1_SEEN(in_dev)) {
870 /* This is a v3 query with v1 queriers present */
871 max_delay = IGMP_Query_Response_Interval;
873 } else if (IGMP_V2_SEEN(in_dev)) {
874 /* this is a v3 query with v2 queriers present;
875 * Interpretation of the max_delay code is problematic here.
876 * A real v2 host would use ih_code directly, while v3 has a
877 * different encoding. We use the v3 encoding as more likely
878 * to be intended in a v3 query.
880 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
882 max_delay = 1; /* can't mod w/ 0 */
884 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
887 ih3 = igmpv3_query_hdr(skb);
889 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
890 + ntohs(ih3->nsrcs)*sizeof(__be32)))
892 ih3 = igmpv3_query_hdr(skb);
895 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
897 max_delay = 1; /* can't mod w/ 0 */
898 in_dev->mr_maxdelay = max_delay;
900 in_dev->mr_qrv = ih3->qrv;
901 if (!group) { /* general query */
903 return; /* no sources allowed */
904 igmp_gq_start_timer(in_dev);
907 /* mark sources to include, if group & source-specific */
908 mark = ih3->nsrcs != 0;
912 * - Start the timers in all of our membership records
913 * that the query applies to for the interface on
914 * which the query arrived excl. those that belong
915 * to a "local" group (224.0.0.X)
916 * - For timers already running check if they need to
918 * - Use the igmp->igmp_code field as the maximum
922 for_each_pmc_rcu(in_dev, im) {
925 if (group && group != im->multiaddr)
927 if (im->multiaddr == IGMP_ALL_HOSTS)
929 spin_lock_bh(&im->lock);
931 im->gsquery = im->gsquery && mark;
934 changed = !im->gsquery ||
935 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
936 spin_unlock_bh(&im->lock);
938 igmp_mod_timer(im, max_delay);
943 /* called in rcu_read_lock() section */
944 int igmp_rcv(struct sk_buff *skb)
946 /* This basically follows the spec line by line -- see RFC1112 */
948 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
954 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
957 switch (skb->ip_summed) {
958 case CHECKSUM_COMPLETE:
959 if (!csum_fold(skb->csum))
964 if (__skb_checksum_complete(skb))
970 case IGMP_HOST_MEMBERSHIP_QUERY:
971 igmp_heard_query(in_dev, skb, len);
973 case IGMP_HOST_MEMBERSHIP_REPORT:
974 case IGMPV2_HOST_MEMBERSHIP_REPORT:
975 /* Is it our report looped back? */
976 if (rt_is_output_route(skb_rtable(skb)))
978 /* don't rely on MC router hearing unicast reports */
979 if (skb->pkt_type == PACKET_MULTICAST ||
980 skb->pkt_type == PACKET_BROADCAST)
981 igmp_heard_report(in_dev, ih->group);
984 #ifdef CONFIG_IP_PIMSM_V1
985 return pim_rcv_v1(skb);
987 case IGMPV3_HOST_MEMBERSHIP_REPORT:
990 case IGMP_HOST_LEAVE_MESSAGE:
992 case IGMP_MTRACE_RESP:
1007 * Add a filter to a device
1010 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1012 char buf[MAX_ADDR_LEN];
1013 struct net_device *dev = in_dev->dev;
1015 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1016 We will get multicast token leakage, when IFF_MULTICAST
1017 is changed. This check should be done in ndo_set_rx_mode
1018 routine. Something sort of:
1019 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1022 if (arp_mc_map(addr, buf, dev, 0) == 0)
1023 dev_mc_add(dev, buf);
1027 * Remove a filter from a device
1030 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1032 char buf[MAX_ADDR_LEN];
1033 struct net_device *dev = in_dev->dev;
1035 if (arp_mc_map(addr, buf, dev, 0) == 0)
1036 dev_mc_del(dev, buf);
1039 #ifdef CONFIG_IP_MULTICAST
1041 * deleted ip_mc_list manipulation
1043 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1045 struct ip_mc_list *pmc;
1047 /* this is an "ip_mc_list" for convenience; only the fields below
1048 * are actually used. In particular, the refcnt and users are not
1049 * used for management of the delete list. Using the same structure
1050 * for deleted items allows change reports to use common code with
1051 * non-deleted or query-response MCA's.
1053 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1056 spin_lock_bh(&im->lock);
1057 pmc->interface = im->interface;
1058 in_dev_hold(in_dev);
1059 pmc->multiaddr = im->multiaddr;
1060 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1061 IGMP_Unsolicited_Report_Count;
1062 pmc->sfmode = im->sfmode;
1063 if (pmc->sfmode == MCAST_INCLUDE) {
1064 struct ip_sf_list *psf;
1066 pmc->tomb = im->tomb;
1067 pmc->sources = im->sources;
1068 im->tomb = im->sources = NULL;
1069 for (psf=pmc->sources; psf; psf=psf->sf_next)
1070 psf->sf_crcount = pmc->crcount;
1072 spin_unlock_bh(&im->lock);
1074 spin_lock_bh(&in_dev->mc_tomb_lock);
1075 pmc->next = in_dev->mc_tomb;
1076 in_dev->mc_tomb = pmc;
1077 spin_unlock_bh(&in_dev->mc_tomb_lock);
1080 static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
1082 struct ip_mc_list *pmc, *pmc_prev;
1083 struct ip_sf_list *psf, *psf_next;
1085 spin_lock_bh(&in_dev->mc_tomb_lock);
1087 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1088 if (pmc->multiaddr == multiaddr)
1094 pmc_prev->next = pmc->next;
1096 in_dev->mc_tomb = pmc->next;
1098 spin_unlock_bh(&in_dev->mc_tomb_lock);
1100 for (psf=pmc->tomb; psf; psf=psf_next) {
1101 psf_next = psf->sf_next;
1104 in_dev_put(pmc->interface);
1109 static void igmpv3_clear_delrec(struct in_device *in_dev)
1111 struct ip_mc_list *pmc, *nextpmc;
1113 spin_lock_bh(&in_dev->mc_tomb_lock);
1114 pmc = in_dev->mc_tomb;
1115 in_dev->mc_tomb = NULL;
1116 spin_unlock_bh(&in_dev->mc_tomb_lock);
1118 for (; pmc; pmc = nextpmc) {
1119 nextpmc = pmc->next;
1120 ip_mc_clear_src(pmc);
1121 in_dev_put(pmc->interface);
1124 /* clear dead sources, too */
1126 for_each_pmc_rcu(in_dev, pmc) {
1127 struct ip_sf_list *psf, *psf_next;
1129 spin_lock_bh(&pmc->lock);
1132 spin_unlock_bh(&pmc->lock);
1133 for (; psf; psf=psf_next) {
1134 psf_next = psf->sf_next;
1142 static void igmp_group_dropped(struct ip_mc_list *im)
1144 struct in_device *in_dev = im->interface;
1145 #ifdef CONFIG_IP_MULTICAST
1151 ip_mc_filter_del(in_dev, im->multiaddr);
1154 #ifdef CONFIG_IP_MULTICAST
1155 if (im->multiaddr == IGMP_ALL_HOSTS)
1158 reporter = im->reporter;
1159 igmp_stop_timer(im);
1161 if (!in_dev->dead) {
1162 if (IGMP_V1_SEEN(in_dev))
1164 if (IGMP_V2_SEEN(in_dev)) {
1166 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1170 igmpv3_add_delrec(in_dev, im);
1172 igmp_ifc_event(in_dev);
1177 static void igmp_group_added(struct ip_mc_list *im)
1179 struct in_device *in_dev = im->interface;
1181 if (im->loaded == 0) {
1183 ip_mc_filter_add(in_dev, im->multiaddr);
1186 #ifdef CONFIG_IP_MULTICAST
1187 if (im->multiaddr == IGMP_ALL_HOSTS)
1192 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1193 spin_lock_bh(&im->lock);
1194 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1195 spin_unlock_bh(&im->lock);
1200 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1201 IGMP_Unsolicited_Report_Count;
1202 igmp_ifc_event(in_dev);
1208 * Multicast list managers
1213 * A socket has joined a multicast group on device dev.
1216 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1218 struct ip_mc_list *im;
1222 for_each_pmc_rtnl(in_dev, im) {
1223 if (im->multiaddr == addr) {
1225 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1230 im = kzalloc(sizeof(*im), GFP_KERNEL);
1235 im->interface = in_dev;
1236 in_dev_hold(in_dev);
1237 im->multiaddr = addr;
1238 /* initial mode is (EX, empty) */
1239 im->sfmode = MCAST_EXCLUDE;
1240 im->sfcount[MCAST_EXCLUDE] = 1;
1241 atomic_set(&im->refcnt, 1);
1242 spin_lock_init(&im->lock);
1243 #ifdef CONFIG_IP_MULTICAST
1244 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1245 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1248 im->next_rcu = in_dev->mc_list;
1250 rcu_assign_pointer(in_dev->mc_list, im);
1252 #ifdef CONFIG_IP_MULTICAST
1253 igmpv3_del_delrec(in_dev, im->multiaddr);
1255 igmp_group_added(im);
1257 ip_rt_multicast_event(in_dev);
1261 EXPORT_SYMBOL(ip_mc_inc_group);
1264 * Resend IGMP JOIN report; used for bonding.
1265 * Called with rcu_read_lock()
1267 void ip_mc_rejoin_groups(struct in_device *in_dev)
1269 #ifdef CONFIG_IP_MULTICAST
1270 struct ip_mc_list *im;
1273 for_each_pmc_rcu(in_dev, im) {
1274 if (im->multiaddr == IGMP_ALL_HOSTS)
1277 /* a failover is happening and switches
1278 * must be notified immediately
1280 if (IGMP_V1_SEEN(in_dev))
1281 type = IGMP_HOST_MEMBERSHIP_REPORT;
1282 else if (IGMP_V2_SEEN(in_dev))
1283 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1285 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1286 igmp_send_report(in_dev, im, type);
1290 EXPORT_SYMBOL(ip_mc_rejoin_groups);
1293 * A socket has left a multicast group on device dev
1296 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1298 struct ip_mc_list *i;
1299 struct ip_mc_list __rcu **ip;
1303 for (ip = &in_dev->mc_list;
1304 (i = rtnl_dereference(*ip)) != NULL;
1305 ip = &i->next_rcu) {
1306 if (i->multiaddr == addr) {
1307 if (--i->users == 0) {
1310 igmp_group_dropped(i);
1314 ip_rt_multicast_event(in_dev);
1323 EXPORT_SYMBOL(ip_mc_dec_group);
1325 /* Device changing type */
1327 void ip_mc_unmap(struct in_device *in_dev)
1329 struct ip_mc_list *pmc;
1333 for_each_pmc_rtnl(in_dev, pmc)
1334 igmp_group_dropped(pmc);
1337 void ip_mc_remap(struct in_device *in_dev)
1339 struct ip_mc_list *pmc;
1343 for_each_pmc_rtnl(in_dev, pmc)
1344 igmp_group_added(pmc);
1347 /* Device going down */
1349 void ip_mc_down(struct in_device *in_dev)
1351 struct ip_mc_list *pmc;
1355 for_each_pmc_rtnl(in_dev, pmc)
1356 igmp_group_dropped(pmc);
1358 #ifdef CONFIG_IP_MULTICAST
1359 in_dev->mr_ifc_count = 0;
1360 if (del_timer(&in_dev->mr_ifc_timer))
1361 __in_dev_put(in_dev);
1362 in_dev->mr_gq_running = 0;
1363 if (del_timer(&in_dev->mr_gq_timer))
1364 __in_dev_put(in_dev);
1365 igmpv3_clear_delrec(in_dev);
1368 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1371 void ip_mc_init_dev(struct in_device *in_dev)
1375 in_dev->mc_tomb = NULL;
1376 #ifdef CONFIG_IP_MULTICAST
1377 in_dev->mr_gq_running = 0;
1378 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1379 (unsigned long)in_dev);
1380 in_dev->mr_ifc_count = 0;
1381 in_dev->mc_count = 0;
1382 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1383 (unsigned long)in_dev);
1384 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1387 spin_lock_init(&in_dev->mc_tomb_lock);
1390 /* Device going up */
1392 void ip_mc_up(struct in_device *in_dev)
1394 struct ip_mc_list *pmc;
1398 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1400 for_each_pmc_rtnl(in_dev, pmc)
1401 igmp_group_added(pmc);
1405 * Device is about to be destroyed: clean up.
1408 void ip_mc_destroy_dev(struct in_device *in_dev)
1410 struct ip_mc_list *i;
1414 /* Deactivate timers */
1417 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1418 in_dev->mc_list = i->next_rcu;
1421 /* We've dropped the groups in ip_mc_down already */
1427 /* RTNL is locked */
1428 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1430 struct net_device *dev = NULL;
1431 struct in_device *idev = NULL;
1433 if (imr->imr_ifindex) {
1434 idev = inetdev_by_index(net, imr->imr_ifindex);
1437 if (imr->imr_address.s_addr) {
1438 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1444 struct rtable *rt = ip_route_output(net,
1445 imr->imr_multiaddr.s_addr,
1453 imr->imr_ifindex = dev->ifindex;
1454 idev = __in_dev_get_rtnl(dev);
1460 * Join a socket to a group
1462 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1463 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1466 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1469 struct ip_sf_list *psf, *psf_prev;
1473 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1474 if (psf->sf_inaddr == *psfsrc)
1478 if (!psf || psf->sf_count[sfmode] == 0) {
1479 /* source filter not found, or count wrong => bug */
1482 psf->sf_count[sfmode]--;
1483 if (psf->sf_count[sfmode] == 0) {
1484 ip_rt_multicast_event(pmc->interface);
1486 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1487 #ifdef CONFIG_IP_MULTICAST
1488 struct in_device *in_dev = pmc->interface;
1491 /* no more filters for this source */
1493 psf_prev->sf_next = psf->sf_next;
1495 pmc->sources = psf->sf_next;
1496 #ifdef CONFIG_IP_MULTICAST
1497 if (psf->sf_oldin &&
1498 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1499 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1500 IGMP_Unsolicited_Report_Count;
1501 psf->sf_next = pmc->tomb;
1511 #ifndef CONFIG_IP_MULTICAST
1512 #define igmp_ifc_event(x) do { } while (0)
1515 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1516 int sfcount, __be32 *psfsrc, int delta)
1518 struct ip_mc_list *pmc;
1525 for_each_pmc_rcu(in_dev, pmc) {
1526 if (*pmca == pmc->multiaddr)
1530 /* MCA not found?? bug */
1534 spin_lock_bh(&pmc->lock);
1536 #ifdef CONFIG_IP_MULTICAST
1541 if (!pmc->sfcount[sfmode])
1543 pmc->sfcount[sfmode]--;
1546 for (i=0; i<sfcount; i++) {
1547 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1549 changerec |= rv > 0;
1553 if (pmc->sfmode == MCAST_EXCLUDE &&
1554 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1555 pmc->sfcount[MCAST_INCLUDE]) {
1556 #ifdef CONFIG_IP_MULTICAST
1557 struct ip_sf_list *psf;
1560 /* filter mode change */
1561 pmc->sfmode = MCAST_INCLUDE;
1562 #ifdef CONFIG_IP_MULTICAST
1563 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1564 IGMP_Unsolicited_Report_Count;
1565 in_dev->mr_ifc_count = pmc->crcount;
1566 for (psf=pmc->sources; psf; psf = psf->sf_next)
1567 psf->sf_crcount = 0;
1568 igmp_ifc_event(pmc->interface);
1569 } else if (sf_setstate(pmc) || changerec) {
1570 igmp_ifc_event(pmc->interface);
1574 spin_unlock_bh(&pmc->lock);
1579 * Add multicast single-source filter to the interface list
1581 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1582 __be32 *psfsrc, int delta)
1584 struct ip_sf_list *psf, *psf_prev;
1587 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1588 if (psf->sf_inaddr == *psfsrc)
1593 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1596 psf->sf_inaddr = *psfsrc;
1598 psf_prev->sf_next = psf;
1602 psf->sf_count[sfmode]++;
1603 if (psf->sf_count[sfmode] == 1) {
1604 ip_rt_multicast_event(pmc->interface);
1609 #ifdef CONFIG_IP_MULTICAST
1610 static void sf_markstate(struct ip_mc_list *pmc)
1612 struct ip_sf_list *psf;
1613 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1615 for (psf=pmc->sources; psf; psf=psf->sf_next)
1616 if (pmc->sfcount[MCAST_EXCLUDE]) {
1617 psf->sf_oldin = mca_xcount ==
1618 psf->sf_count[MCAST_EXCLUDE] &&
1619 !psf->sf_count[MCAST_INCLUDE];
1621 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1624 static int sf_setstate(struct ip_mc_list *pmc)
1626 struct ip_sf_list *psf, *dpsf;
1627 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1628 int qrv = pmc->interface->mr_qrv;
1632 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1633 if (pmc->sfcount[MCAST_EXCLUDE]) {
1634 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1635 !psf->sf_count[MCAST_INCLUDE];
1637 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1639 if (!psf->sf_oldin) {
1640 struct ip_sf_list *prev = NULL;
1642 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1643 if (dpsf->sf_inaddr == psf->sf_inaddr)
1649 prev->sf_next = dpsf->sf_next;
1651 pmc->tomb = dpsf->sf_next;
1654 psf->sf_crcount = qrv;
1657 } else if (psf->sf_oldin) {
1659 psf->sf_crcount = 0;
1661 * add or update "delete" records if an active filter
1664 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1665 if (dpsf->sf_inaddr == psf->sf_inaddr)
1668 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1672 /* pmc->lock held by callers */
1673 dpsf->sf_next = pmc->tomb;
1676 dpsf->sf_crcount = qrv;
1685 * Add multicast source filter list to the interface list
1687 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1688 int sfcount, __be32 *psfsrc, int delta)
1690 struct ip_mc_list *pmc;
1697 for_each_pmc_rcu(in_dev, pmc) {
1698 if (*pmca == pmc->multiaddr)
1702 /* MCA not found?? bug */
1706 spin_lock_bh(&pmc->lock);
1709 #ifdef CONFIG_IP_MULTICAST
1712 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1714 pmc->sfcount[sfmode]++;
1716 for (i=0; i<sfcount; i++) {
1717 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1725 pmc->sfcount[sfmode]--;
1727 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1728 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1729 #ifdef CONFIG_IP_MULTICAST
1730 struct ip_sf_list *psf;
1731 in_dev = pmc->interface;
1734 /* filter mode change */
1735 if (pmc->sfcount[MCAST_EXCLUDE])
1736 pmc->sfmode = MCAST_EXCLUDE;
1737 else if (pmc->sfcount[MCAST_INCLUDE])
1738 pmc->sfmode = MCAST_INCLUDE;
1739 #ifdef CONFIG_IP_MULTICAST
1740 /* else no filters; keep old mode for reports */
1742 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1743 IGMP_Unsolicited_Report_Count;
1744 in_dev->mr_ifc_count = pmc->crcount;
1745 for (psf=pmc->sources; psf; psf = psf->sf_next)
1746 psf->sf_crcount = 0;
1747 igmp_ifc_event(in_dev);
1748 } else if (sf_setstate(pmc)) {
1749 igmp_ifc_event(in_dev);
1752 spin_unlock_bh(&pmc->lock);
1756 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1758 struct ip_sf_list *psf, *nextpsf;
1760 for (psf=pmc->tomb; psf; psf=nextpsf) {
1761 nextpsf = psf->sf_next;
1765 for (psf=pmc->sources; psf; psf=nextpsf) {
1766 nextpsf = psf->sf_next;
1769 pmc->sources = NULL;
1770 pmc->sfmode = MCAST_EXCLUDE;
1771 pmc->sfcount[MCAST_INCLUDE] = 0;
1772 pmc->sfcount[MCAST_EXCLUDE] = 1;
1777 * Join a multicast group
1779 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1782 __be32 addr = imr->imr_multiaddr.s_addr;
1783 struct ip_mc_socklist *iml = NULL, *i;
1784 struct in_device *in_dev;
1785 struct inet_sock *inet = inet_sk(sk);
1786 struct net *net = sock_net(sk);
1790 if (!ipv4_is_multicast(addr))
1795 in_dev = ip_mc_find_dev(net, imr);
1804 ifindex = imr->imr_ifindex;
1805 for_each_pmc_rtnl(inet, i) {
1806 if (i->multi.imr_multiaddr.s_addr == addr &&
1807 i->multi.imr_ifindex == ifindex)
1812 if (count >= sysctl_igmp_max_memberships)
1814 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1818 memcpy(&iml->multi, imr, sizeof(*imr));
1819 iml->next_rcu = inet->mc_list;
1821 iml->sfmode = MCAST_EXCLUDE;
1822 rcu_assign_pointer(inet->mc_list, iml);
1823 ip_mc_inc_group(in_dev, addr);
1829 EXPORT_SYMBOL(ip_mc_join_group);
1831 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1832 struct in_device *in_dev)
1834 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1838 /* any-source empty exclude case */
1839 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1840 iml->sfmode, 0, NULL, 0);
1842 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1843 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1844 RCU_INIT_POINTER(iml->sflist, NULL);
1845 /* decrease mem now to avoid the memleak warning */
1846 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1847 kfree_rcu(psf, rcu);
1852 * Ask a socket to leave a group.
1855 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1857 struct inet_sock *inet = inet_sk(sk);
1858 struct ip_mc_socklist *iml;
1859 struct ip_mc_socklist __rcu **imlp;
1860 struct in_device *in_dev;
1861 struct net *net = sock_net(sk);
1862 __be32 group = imr->imr_multiaddr.s_addr;
1864 int ret = -EADDRNOTAVAIL;
1867 in_dev = ip_mc_find_dev(net, imr);
1868 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
1872 ifindex = imr->imr_ifindex;
1873 for (imlp = &inet->mc_list;
1874 (iml = rtnl_dereference(*imlp)) != NULL;
1875 imlp = &iml->next_rcu) {
1876 if (iml->multi.imr_multiaddr.s_addr != group)
1879 if (iml->multi.imr_ifindex != ifindex)
1881 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1882 iml->multi.imr_address.s_addr)
1885 (void) ip_mc_leave_src(sk, iml, in_dev);
1887 *imlp = iml->next_rcu;
1890 ip_mc_dec_group(in_dev, group);
1892 /* decrease mem now to avoid the memleak warning */
1893 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1894 kfree_rcu(iml, rcu);
1902 int ip_mc_source(int add, int omode, struct sock *sk, struct
1903 ip_mreq_source *mreqs, int ifindex)
1906 struct ip_mreqn imr;
1907 __be32 addr = mreqs->imr_multiaddr;
1908 struct ip_mc_socklist *pmc;
1909 struct in_device *in_dev = NULL;
1910 struct inet_sock *inet = inet_sk(sk);
1911 struct ip_sf_socklist *psl;
1912 struct net *net = sock_net(sk);
1916 if (!ipv4_is_multicast(addr))
1921 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1922 imr.imr_address.s_addr = mreqs->imr_interface;
1923 imr.imr_ifindex = ifindex;
1924 in_dev = ip_mc_find_dev(net, &imr);
1930 err = -EADDRNOTAVAIL;
1932 for_each_pmc_rtnl(inet, pmc) {
1933 if ((pmc->multi.imr_multiaddr.s_addr ==
1934 imr.imr_multiaddr.s_addr) &&
1935 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1938 if (!pmc) { /* must have a prior join */
1942 /* if a source filter was set, must be the same mode as before */
1944 if (pmc->sfmode != omode) {
1948 } else if (pmc->sfmode != omode) {
1949 /* allow mode switches for empty-set filters */
1950 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1951 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1953 pmc->sfmode = omode;
1956 psl = rtnl_dereference(pmc->sflist);
1959 goto done; /* err = -EADDRNOTAVAIL */
1961 for (i=0; i<psl->sl_count; i++) {
1962 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
1967 if (rv) /* source not found */
1968 goto done; /* err = -EADDRNOTAVAIL */
1970 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1971 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1976 /* update the interface filter */
1977 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
1978 &mreqs->imr_sourceaddr, 1);
1980 for (j=i+1; j<psl->sl_count; j++)
1981 psl->sl_addr[j-1] = psl->sl_addr[j];
1986 /* else, add a new source to the filter */
1988 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1992 if (!psl || psl->sl_count == psl->sl_max) {
1993 struct ip_sf_socklist *newpsl;
1994 int count = IP_SFBLOCK;
1997 count += psl->sl_max;
1998 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2003 newpsl->sl_max = count;
2004 newpsl->sl_count = count - IP_SFBLOCK;
2006 for (i=0; i<psl->sl_count; i++)
2007 newpsl->sl_addr[i] = psl->sl_addr[i];
2008 /* decrease mem now to avoid the memleak warning */
2009 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2010 kfree_rcu(psl, rcu);
2012 rcu_assign_pointer(pmc->sflist, newpsl);
2015 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2016 for (i=0; i<psl->sl_count; i++) {
2017 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2022 if (rv == 0) /* address already there is an error */
2024 for (j=psl->sl_count-1; j>=i; j--)
2025 psl->sl_addr[j+1] = psl->sl_addr[j];
2026 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2029 /* update the interface list */
2030 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2031 &mreqs->imr_sourceaddr, 1);
2035 return ip_mc_leave_group(sk, &imr);
2039 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2042 struct ip_mreqn imr;
2043 __be32 addr = msf->imsf_multiaddr;
2044 struct ip_mc_socklist *pmc;
2045 struct in_device *in_dev;
2046 struct inet_sock *inet = inet_sk(sk);
2047 struct ip_sf_socklist *newpsl, *psl;
2048 struct net *net = sock_net(sk);
2051 if (!ipv4_is_multicast(addr))
2053 if (msf->imsf_fmode != MCAST_INCLUDE &&
2054 msf->imsf_fmode != MCAST_EXCLUDE)
2059 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2060 imr.imr_address.s_addr = msf->imsf_interface;
2061 imr.imr_ifindex = ifindex;
2062 in_dev = ip_mc_find_dev(net, &imr);
2069 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2070 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2075 for_each_pmc_rtnl(inet, pmc) {
2076 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2077 pmc->multi.imr_ifindex == imr.imr_ifindex)
2080 if (!pmc) { /* must have a prior join */
2084 if (msf->imsf_numsrc) {
2085 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2091 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2092 memcpy(newpsl->sl_addr, msf->imsf_slist,
2093 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2094 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2095 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2097 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2102 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2103 msf->imsf_fmode, 0, NULL, 0);
2105 psl = rtnl_dereference(pmc->sflist);
2107 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2108 psl->sl_count, psl->sl_addr, 0);
2109 /* decrease mem now to avoid the memleak warning */
2110 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2111 kfree_rcu(psl, rcu);
2113 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2115 rcu_assign_pointer(pmc->sflist, newpsl);
2116 pmc->sfmode = msf->imsf_fmode;
2121 err = ip_mc_leave_group(sk, &imr);
2125 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2126 struct ip_msfilter __user *optval, int __user *optlen)
2128 int err, len, count, copycount;
2129 struct ip_mreqn imr;
2130 __be32 addr = msf->imsf_multiaddr;
2131 struct ip_mc_socklist *pmc;
2132 struct in_device *in_dev;
2133 struct inet_sock *inet = inet_sk(sk);
2134 struct ip_sf_socklist *psl;
2135 struct net *net = sock_net(sk);
2137 if (!ipv4_is_multicast(addr))
2142 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2143 imr.imr_address.s_addr = msf->imsf_interface;
2144 imr.imr_ifindex = 0;
2145 in_dev = ip_mc_find_dev(net, &imr);
2151 err = -EADDRNOTAVAIL;
2153 for_each_pmc_rtnl(inet, pmc) {
2154 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2155 pmc->multi.imr_ifindex == imr.imr_ifindex)
2158 if (!pmc) /* must have a prior join */
2160 msf->imsf_fmode = pmc->sfmode;
2161 psl = rtnl_dereference(pmc->sflist);
2167 count = psl->sl_count;
2169 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2170 len = copycount * sizeof(psl->sl_addr[0]);
2171 msf->imsf_numsrc = count;
2172 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2173 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2177 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2185 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2186 struct group_filter __user *optval, int __user *optlen)
2188 int err, i, count, copycount;
2189 struct sockaddr_in *psin;
2191 struct ip_mc_socklist *pmc;
2192 struct inet_sock *inet = inet_sk(sk);
2193 struct ip_sf_socklist *psl;
2195 psin = (struct sockaddr_in *)&gsf->gf_group;
2196 if (psin->sin_family != AF_INET)
2198 addr = psin->sin_addr.s_addr;
2199 if (!ipv4_is_multicast(addr))
2204 err = -EADDRNOTAVAIL;
2206 for_each_pmc_rtnl(inet, pmc) {
2207 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2208 pmc->multi.imr_ifindex == gsf->gf_interface)
2211 if (!pmc) /* must have a prior join */
2213 gsf->gf_fmode = pmc->sfmode;
2214 psl = rtnl_dereference(pmc->sflist);
2216 count = psl ? psl->sl_count : 0;
2217 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2218 gsf->gf_numsrc = count;
2219 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2220 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2223 for (i=0; i<copycount; i++) {
2224 struct sockaddr_storage ss;
2226 psin = (struct sockaddr_in *)&ss;
2227 memset(&ss, 0, sizeof(ss));
2228 psin->sin_family = AF_INET;
2229 psin->sin_addr.s_addr = psl->sl_addr[i];
2230 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2240 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2242 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2244 struct inet_sock *inet = inet_sk(sk);
2245 struct ip_mc_socklist *pmc;
2246 struct ip_sf_socklist *psl;
2251 if (!ipv4_is_multicast(loc_addr))
2255 for_each_pmc_rcu(inet, pmc) {
2256 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2257 pmc->multi.imr_ifindex == dif)
2263 psl = rcu_dereference(pmc->sflist);
2264 ret = (pmc->sfmode == MCAST_EXCLUDE);
2268 for (i=0; i<psl->sl_count; i++) {
2269 if (psl->sl_addr[i] == rmt_addr)
2273 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2275 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2285 * A socket is closing.
2288 void ip_mc_drop_socket(struct sock *sk)
2290 struct inet_sock *inet = inet_sk(sk);
2291 struct ip_mc_socklist *iml;
2292 struct net *net = sock_net(sk);
2294 if (inet->mc_list == NULL)
2298 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2299 struct in_device *in_dev;
2301 inet->mc_list = iml->next_rcu;
2302 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2303 (void) ip_mc_leave_src(sk, iml, in_dev);
2305 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2306 /* decrease mem now to avoid the memleak warning */
2307 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2308 kfree_rcu(iml, rcu);
2313 /* called with rcu_read_lock() */
2314 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2316 struct ip_mc_list *im;
2317 struct ip_sf_list *psf;
2320 for_each_pmc_rcu(in_dev, im) {
2321 if (im->multiaddr == mc_addr)
2324 if (im && proto == IPPROTO_IGMP) {
2328 for (psf=im->sources; psf; psf=psf->sf_next) {
2329 if (psf->sf_inaddr == src_addr)
2333 rv = psf->sf_count[MCAST_INCLUDE] ||
2334 psf->sf_count[MCAST_EXCLUDE] !=
2335 im->sfcount[MCAST_EXCLUDE];
2337 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2339 rv = 1; /* unspecified source; tentatively allow */
2344 #if defined(CONFIG_PROC_FS)
2345 struct igmp_mc_iter_state {
2346 struct seq_net_private p;
2347 struct net_device *dev;
2348 struct in_device *in_dev;
2351 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2353 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2355 struct net *net = seq_file_net(seq);
2356 struct ip_mc_list *im = NULL;
2357 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2359 state->in_dev = NULL;
2360 for_each_netdev_rcu(net, state->dev) {
2361 struct in_device *in_dev;
2363 in_dev = __in_dev_get_rcu(state->dev);
2366 im = rcu_dereference(in_dev->mc_list);
2368 state->in_dev = in_dev;
2375 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2377 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2379 im = rcu_dereference(im->next_rcu);
2381 state->dev = next_net_device_rcu(state->dev);
2383 state->in_dev = NULL;
2386 state->in_dev = __in_dev_get_rcu(state->dev);
2389 im = rcu_dereference(state->in_dev->mc_list);
2394 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2396 struct ip_mc_list *im = igmp_mc_get_first(seq);
2398 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2400 return pos ? NULL : im;
2403 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2407 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2410 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2412 struct ip_mc_list *im;
2413 if (v == SEQ_START_TOKEN)
2414 im = igmp_mc_get_first(seq);
2416 im = igmp_mc_get_next(seq, v);
2421 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2424 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2426 state->in_dev = NULL;
2431 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2433 if (v == SEQ_START_TOKEN)
2435 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2437 struct ip_mc_list *im = (struct ip_mc_list *)v;
2438 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2440 #ifdef CONFIG_IP_MULTICAST
2441 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2442 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2448 if (rcu_dereference(state->in_dev->mc_list) == im) {
2449 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2450 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2454 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2455 im->multiaddr, im->users,
2456 im->tm_running, im->tm_running ?
2457 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2463 static const struct seq_operations igmp_mc_seq_ops = {
2464 .start = igmp_mc_seq_start,
2465 .next = igmp_mc_seq_next,
2466 .stop = igmp_mc_seq_stop,
2467 .show = igmp_mc_seq_show,
2470 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2472 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2473 sizeof(struct igmp_mc_iter_state));
2476 static const struct file_operations igmp_mc_seq_fops = {
2477 .owner = THIS_MODULE,
2478 .open = igmp_mc_seq_open,
2480 .llseek = seq_lseek,
2481 .release = seq_release_net,
2484 struct igmp_mcf_iter_state {
2485 struct seq_net_private p;
2486 struct net_device *dev;
2487 struct in_device *idev;
2488 struct ip_mc_list *im;
2491 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2493 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2495 struct net *net = seq_file_net(seq);
2496 struct ip_sf_list *psf = NULL;
2497 struct ip_mc_list *im = NULL;
2498 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2502 for_each_netdev_rcu(net, state->dev) {
2503 struct in_device *idev;
2504 idev = __in_dev_get_rcu(state->dev);
2505 if (unlikely(idev == NULL))
2507 im = rcu_dereference(idev->mc_list);
2508 if (likely(im != NULL)) {
2509 spin_lock_bh(&im->lock);
2511 if (likely(psf != NULL)) {
2516 spin_unlock_bh(&im->lock);
2522 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2524 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2528 spin_unlock_bh(&state->im->lock);
2529 state->im = state->im->next;
2530 while (!state->im) {
2531 state->dev = next_net_device_rcu(state->dev);
2536 state->idev = __in_dev_get_rcu(state->dev);
2539 state->im = rcu_dereference(state->idev->mc_list);
2543 spin_lock_bh(&state->im->lock);
2544 psf = state->im->sources;
2550 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2552 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2554 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2556 return pos ? NULL : psf;
2559 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2563 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2566 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2568 struct ip_sf_list *psf;
2569 if (v == SEQ_START_TOKEN)
2570 psf = igmp_mcf_get_first(seq);
2572 psf = igmp_mcf_get_next(seq, v);
2577 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2580 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2581 if (likely(state->im != NULL)) {
2582 spin_unlock_bh(&state->im->lock);
2590 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2592 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2593 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2595 if (v == SEQ_START_TOKEN) {
2598 "%10s %10s %6s %6s\n", "Idx",
2600 "SRC", "INC", "EXC");
2604 "0x%08x %6lu %6lu\n",
2605 state->dev->ifindex, state->dev->name,
2606 ntohl(state->im->multiaddr),
2607 ntohl(psf->sf_inaddr),
2608 psf->sf_count[MCAST_INCLUDE],
2609 psf->sf_count[MCAST_EXCLUDE]);
2614 static const struct seq_operations igmp_mcf_seq_ops = {
2615 .start = igmp_mcf_seq_start,
2616 .next = igmp_mcf_seq_next,
2617 .stop = igmp_mcf_seq_stop,
2618 .show = igmp_mcf_seq_show,
2621 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2623 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2624 sizeof(struct igmp_mcf_iter_state));
2627 static const struct file_operations igmp_mcf_seq_fops = {
2628 .owner = THIS_MODULE,
2629 .open = igmp_mcf_seq_open,
2631 .llseek = seq_lseek,
2632 .release = seq_release_net,
2635 static int __net_init igmp_net_init(struct net *net)
2637 struct proc_dir_entry *pde;
2639 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2642 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2648 proc_net_remove(net, "igmp");
2653 static void __net_exit igmp_net_exit(struct net *net)
2655 proc_net_remove(net, "mcfilter");
2656 proc_net_remove(net, "igmp");
2659 static struct pernet_operations igmp_net_ops = {
2660 .init = igmp_net_init,
2661 .exit = igmp_net_exit,
2664 int __init igmp_mc_proc_init(void)
2666 return register_pernet_subsys(&igmp_net_ops);