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>
92 #include <linux/byteorder/generic.h>
94 #include <net/net_namespace.h>
97 #include <net/protocol.h>
98 #include <net/route.h>
100 #include <net/checksum.h>
101 #include <linux/netfilter_ipv4.h>
102 #ifdef CONFIG_IP_MROUTE
103 #include <linux/mroute.h>
105 #ifdef CONFIG_PROC_FS
106 #include <linux/proc_fs.h>
107 #include <linux/seq_file.h>
110 #define IP_MAX_MEMBERSHIPS 20
111 #define IP_MAX_MSF 10
113 #ifdef CONFIG_IP_MULTICAST
114 /* Parameter names and values are taken from igmp-v2-06 draft */
116 #define IGMP_V1_Router_Present_Timeout (400*HZ)
117 #define IGMP_V2_Router_Present_Timeout (400*HZ)
118 #define IGMP_Unsolicited_Report_Interval (10*HZ)
119 #define IGMP_Query_Response_Interval (10*HZ)
120 #define IGMP_Unsolicited_Report_Count 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 void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
144 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im);
145 static void igmpv3_clear_delrec(struct in_device *in_dev);
146 static int sf_setstate(struct ip_mc_list *pmc);
147 static void sf_markstate(struct ip_mc_list *pmc);
149 static void ip_mc_clear_src(struct ip_mc_list *pmc);
150 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
151 int sfcount, __be32 *psfsrc, int delta);
153 static void ip_ma_put(struct ip_mc_list *im)
155 if (atomic_dec_and_test(&im->refcnt)) {
156 in_dev_put(im->interface);
161 #define for_each_pmc_rcu(in_dev, pmc) \
162 for (pmc = rcu_dereference(in_dev->mc_list); \
164 pmc = rcu_dereference(pmc->next_rcu))
166 #define for_each_pmc_rtnl(in_dev, pmc) \
167 for (pmc = rtnl_dereference(in_dev->mc_list); \
169 pmc = rtnl_dereference(pmc->next_rcu))
171 #ifdef CONFIG_IP_MULTICAST
177 static void igmp_stop_timer(struct ip_mc_list *im)
179 spin_lock_bh(&im->lock);
180 if (del_timer(&im->timer))
181 atomic_dec(&im->refcnt);
184 im->unsolicit_count = 0;
185 spin_unlock_bh(&im->lock);
188 /* It must be called with locked im->lock */
189 static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
191 int tv = net_random() % max_delay;
194 if (!mod_timer(&im->timer, jiffies+tv+2))
195 atomic_inc(&im->refcnt);
198 static void igmp_gq_start_timer(struct in_device *in_dev)
200 int tv = net_random() % in_dev->mr_maxdelay;
201 unsigned long exp = jiffies + tv + 2;
203 if (in_dev->mr_gq_running &&
204 time_after_eq(exp, (in_dev->mr_gq_timer).expires))
207 in_dev->mr_gq_running = 1;
208 if (!mod_timer(&in_dev->mr_gq_timer, exp))
212 static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
214 int tv = net_random() % delay;
216 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
220 static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
222 spin_lock_bh(&im->lock);
223 im->unsolicit_count = 0;
224 if (del_timer(&im->timer)) {
225 if ((long)(im->timer.expires-jiffies) < max_delay) {
226 add_timer(&im->timer);
228 spin_unlock_bh(&im->lock);
231 atomic_dec(&im->refcnt);
233 igmp_start_timer(im, max_delay);
234 spin_unlock_bh(&im->lock);
239 * Send an IGMP report.
242 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
245 static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
246 int gdeleted, int sdeleted)
249 case IGMPV3_MODE_IS_INCLUDE:
250 case IGMPV3_MODE_IS_EXCLUDE:
251 if (gdeleted || sdeleted)
253 if (!(pmc->gsquery && !psf->sf_gsresp)) {
254 if (pmc->sfmode == MCAST_INCLUDE)
256 /* don't include if this source is excluded
259 if (psf->sf_count[MCAST_INCLUDE])
260 return type == IGMPV3_MODE_IS_INCLUDE;
261 return pmc->sfcount[MCAST_EXCLUDE] ==
262 psf->sf_count[MCAST_EXCLUDE];
265 case IGMPV3_CHANGE_TO_INCLUDE:
266 if (gdeleted || sdeleted)
268 return psf->sf_count[MCAST_INCLUDE] != 0;
269 case IGMPV3_CHANGE_TO_EXCLUDE:
270 if (gdeleted || sdeleted)
272 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
273 psf->sf_count[MCAST_INCLUDE])
275 return pmc->sfcount[MCAST_EXCLUDE] ==
276 psf->sf_count[MCAST_EXCLUDE];
277 case IGMPV3_ALLOW_NEW_SOURCES:
278 if (gdeleted || !psf->sf_crcount)
280 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
281 case IGMPV3_BLOCK_OLD_SOURCES:
282 if (pmc->sfmode == MCAST_INCLUDE)
283 return gdeleted || (psf->sf_crcount && sdeleted);
284 return psf->sf_crcount && !gdeleted && !sdeleted;
290 igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
292 struct ip_sf_list *psf;
295 for (psf=pmc->sources; psf; psf=psf->sf_next) {
296 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
303 /* source address selection per RFC 3376 section 4.2.13 */
304 static __be32 igmpv3_get_srcaddr(struct net_device *dev,
305 const struct flowi4 *fl4)
307 struct in_device *in_dev = __in_dev_get_rcu(dev);
310 return htonl(INADDR_ANY);
313 if (fl4->saddr == ifa->ifa_local)
315 } endfor_ifa(in_dev);
317 return htonl(INADDR_ANY);
320 static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu)
325 struct igmpv3_report *pig;
326 struct net *net = dev_net(dev);
328 int hlen = LL_RESERVED_SPACE(dev);
329 int tlen = dev->needed_tailroom;
330 unsigned int size = mtu;
333 skb = alloc_skb(size + hlen + tlen,
334 GFP_ATOMIC | __GFP_NOWARN);
342 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
344 IPPROTO_IGMP, 0, dev->ifindex);
350 skb_dst_set(skb, &rt->dst);
353 skb_reserve(skb, hlen);
354 skb_tailroom_reserve(skb, mtu, tlen);
356 skb_reset_network_header(skb);
358 skb_put(skb, sizeof(struct iphdr) + 4);
361 pip->ihl = (sizeof(struct iphdr)+4)>>2;
363 pip->frag_off = htons(IP_DF);
365 pip->daddr = fl4.daddr;
366 pip->saddr = igmpv3_get_srcaddr(dev, &fl4);
367 pip->protocol = IPPROTO_IGMP;
368 pip->tot_len = 0; /* filled in later */
369 ip_select_ident(skb, NULL);
370 ((u8*)&pip[1])[0] = IPOPT_RA;
371 ((u8*)&pip[1])[1] = 4;
372 ((u8*)&pip[1])[2] = 0;
373 ((u8*)&pip[1])[3] = 0;
375 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
376 skb_put(skb, sizeof(*pig));
377 pig = igmpv3_report_hdr(skb);
378 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
386 static int igmpv3_sendpack(struct sk_buff *skb)
388 struct igmphdr *pig = igmp_hdr(skb);
389 const int igmplen = skb->tail - skb->transport_header;
391 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
393 return ip_local_out(skb);
396 static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
398 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
401 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
402 int type, struct igmpv3_grec **ppgr)
404 struct net_device *dev = pmc->interface->dev;
405 struct igmpv3_report *pih;
406 struct igmpv3_grec *pgr;
409 skb = igmpv3_newpack(dev, dev->mtu);
412 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
413 pgr->grec_type = type;
414 pgr->grec_auxwords = 0;
416 pgr->grec_mca = pmc->multiaddr;
417 pih = igmpv3_report_hdr(skb);
418 pih->ngrec = htons(ntohs(pih->ngrec)+1);
423 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
425 static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
426 int type, int gdeleted, int sdeleted)
428 struct net_device *dev = pmc->interface->dev;
429 struct igmpv3_report *pih;
430 struct igmpv3_grec *pgr = NULL;
431 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
432 int scount, stotal, first, isquery, truncate;
434 if (pmc->multiaddr == IGMP_ALL_HOSTS)
437 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
438 type == IGMPV3_MODE_IS_EXCLUDE;
439 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
440 type == IGMPV3_CHANGE_TO_EXCLUDE;
444 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
449 pih = skb ? igmpv3_report_hdr(skb) : NULL;
451 /* EX and TO_EX get a fresh packet, if needed */
453 if (pih && pih->ngrec &&
454 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
456 igmpv3_sendpack(skb);
457 skb = igmpv3_newpack(dev, dev->mtu);
462 for (psf=*psf_list; psf; psf=psf_next) {
465 psf_next = psf->sf_next;
467 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
472 /* clear marks on query responses */
476 if (AVAILABLE(skb) < sizeof(__be32) +
477 first*sizeof(struct igmpv3_grec)) {
478 if (truncate && !first)
479 break; /* truncate these */
481 pgr->grec_nsrcs = htons(scount);
483 igmpv3_sendpack(skb);
484 skb = igmpv3_newpack(dev, dev->mtu);
489 skb = add_grhead(skb, pmc, type, &pgr);
494 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
495 *psrc = psf->sf_inaddr;
497 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
498 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
500 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
502 psf_prev->sf_next = psf->sf_next;
504 *psf_list = psf->sf_next;
514 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
515 type == IGMPV3_BLOCK_OLD_SOURCES)
517 if (pmc->crcount || isquery) {
518 /* make sure we have room for group header */
519 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
520 igmpv3_sendpack(skb);
521 skb = NULL; /* add_grhead will get a new one */
523 skb = add_grhead(skb, pmc, type, &pgr);
527 pgr->grec_nsrcs = htons(scount);
530 pmc->gsquery = 0; /* clear query state on report */
534 static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
536 struct sk_buff *skb = NULL;
541 for_each_pmc_rcu(in_dev, pmc) {
542 if (pmc->multiaddr == IGMP_ALL_HOSTS)
544 spin_lock_bh(&pmc->lock);
545 if (pmc->sfcount[MCAST_EXCLUDE])
546 type = IGMPV3_MODE_IS_EXCLUDE;
548 type = IGMPV3_MODE_IS_INCLUDE;
549 skb = add_grec(skb, pmc, type, 0, 0);
550 spin_unlock_bh(&pmc->lock);
554 spin_lock_bh(&pmc->lock);
555 if (pmc->sfcount[MCAST_EXCLUDE])
556 type = IGMPV3_MODE_IS_EXCLUDE;
558 type = IGMPV3_MODE_IS_INCLUDE;
559 skb = add_grec(skb, pmc, type, 0, 0);
560 spin_unlock_bh(&pmc->lock);
564 return igmpv3_sendpack(skb);
568 * remove zero-count source records from a source filter list
570 static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
572 struct ip_sf_list *psf_prev, *psf_next, *psf;
575 for (psf=*ppsf; psf; psf = psf_next) {
576 psf_next = psf->sf_next;
577 if (psf->sf_crcount == 0) {
579 psf_prev->sf_next = psf->sf_next;
581 *ppsf = psf->sf_next;
588 static void igmpv3_send_cr(struct in_device *in_dev)
590 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
591 struct sk_buff *skb = NULL;
595 spin_lock_bh(&in_dev->mc_tomb_lock);
599 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
600 pmc_next = pmc->next;
601 if (pmc->sfmode == MCAST_INCLUDE) {
602 type = IGMPV3_BLOCK_OLD_SOURCES;
603 dtype = IGMPV3_BLOCK_OLD_SOURCES;
604 skb = add_grec(skb, pmc, type, 1, 0);
605 skb = add_grec(skb, pmc, dtype, 1, 1);
608 if (pmc->sfmode == MCAST_EXCLUDE) {
609 type = IGMPV3_CHANGE_TO_INCLUDE;
610 skb = add_grec(skb, pmc, type, 1, 0);
613 if (pmc->crcount == 0) {
614 igmpv3_clear_zeros(&pmc->tomb);
615 igmpv3_clear_zeros(&pmc->sources);
618 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
620 pmc_prev->next = pmc_next;
622 in_dev->mc_tomb = pmc_next;
623 in_dev_put(pmc->interface);
628 spin_unlock_bh(&in_dev->mc_tomb_lock);
631 for_each_pmc_rcu(in_dev, pmc) {
632 spin_lock_bh(&pmc->lock);
633 if (pmc->sfcount[MCAST_EXCLUDE]) {
634 type = IGMPV3_BLOCK_OLD_SOURCES;
635 dtype = IGMPV3_ALLOW_NEW_SOURCES;
637 type = IGMPV3_ALLOW_NEW_SOURCES;
638 dtype = IGMPV3_BLOCK_OLD_SOURCES;
640 skb = add_grec(skb, pmc, type, 0, 0);
641 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
643 /* filter mode changes */
645 if (pmc->sfmode == MCAST_EXCLUDE)
646 type = IGMPV3_CHANGE_TO_EXCLUDE;
648 type = IGMPV3_CHANGE_TO_INCLUDE;
649 skb = add_grec(skb, pmc, type, 0, 0);
652 spin_unlock_bh(&pmc->lock);
658 (void) igmpv3_sendpack(skb);
661 static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
668 struct net_device *dev = in_dev->dev;
669 struct net *net = dev_net(dev);
670 __be32 group = pmc ? pmc->multiaddr : 0;
675 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
676 return igmpv3_send_report(in_dev, pmc);
677 else if (type == IGMP_HOST_LEAVE_MESSAGE)
678 dst = IGMP_ALL_ROUTER;
682 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
684 IPPROTO_IGMP, 0, dev->ifindex);
688 hlen = LL_RESERVED_SPACE(dev);
689 tlen = dev->needed_tailroom;
690 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
696 skb_dst_set(skb, &rt->dst);
698 skb_reserve(skb, hlen);
700 skb_reset_network_header(skb);
702 skb_put(skb, sizeof(struct iphdr) + 4);
705 iph->ihl = (sizeof(struct iphdr)+4)>>2;
707 iph->frag_off = htons(IP_DF);
710 iph->saddr = fl4.saddr;
711 iph->protocol = IPPROTO_IGMP;
712 ip_select_ident(skb, NULL);
713 ((u8*)&iph[1])[0] = IPOPT_RA;
714 ((u8*)&iph[1])[1] = 4;
715 ((u8*)&iph[1])[2] = 0;
716 ((u8*)&iph[1])[3] = 0;
718 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
723 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
725 return ip_local_out(skb);
728 static void igmp_gq_timer_expire(unsigned long data)
730 struct in_device *in_dev = (struct in_device *)data;
732 in_dev->mr_gq_running = 0;
733 igmpv3_send_report(in_dev, NULL);
737 static void igmp_ifc_timer_expire(unsigned long data)
739 struct in_device *in_dev = (struct in_device *)data;
741 igmpv3_send_cr(in_dev);
742 if (in_dev->mr_ifc_count) {
743 in_dev->mr_ifc_count--;
744 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
749 static void igmp_ifc_event(struct in_device *in_dev)
751 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
753 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
754 IGMP_Unsolicited_Report_Count;
755 igmp_ifc_start_timer(in_dev, 1);
759 static void igmp_timer_expire(unsigned long data)
761 struct ip_mc_list *im=(struct ip_mc_list *)data;
762 struct in_device *in_dev = im->interface;
764 spin_lock(&im->lock);
767 if (im->unsolicit_count) {
768 im->unsolicit_count--;
769 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
772 spin_unlock(&im->lock);
774 if (IGMP_V1_SEEN(in_dev))
775 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
776 else if (IGMP_V2_SEEN(in_dev))
777 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
779 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
784 /* mark EXCLUDE-mode sources */
785 static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
787 struct ip_sf_list *psf;
791 for (psf=pmc->sources; psf; psf=psf->sf_next) {
794 for (i=0; i<nsrcs; i++) {
795 /* skip inactive filters */
796 if (psf->sf_count[MCAST_INCLUDE] ||
797 pmc->sfcount[MCAST_EXCLUDE] !=
798 psf->sf_count[MCAST_EXCLUDE])
800 if (srcs[i] == psf->sf_inaddr) {
807 if (scount == nsrcs) /* all sources excluded */
812 static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
814 struct ip_sf_list *psf;
817 if (pmc->sfmode == MCAST_EXCLUDE)
818 return igmp_xmarksources(pmc, nsrcs, srcs);
820 /* mark INCLUDE-mode sources */
822 for (psf=pmc->sources; psf; psf=psf->sf_next) {
825 for (i=0; i<nsrcs; i++)
826 if (srcs[i] == psf->sf_inaddr) {
840 static void igmp_heard_report(struct in_device *in_dev, __be32 group)
842 struct ip_mc_list *im;
844 /* Timers are only set for non-local groups */
846 if (group == IGMP_ALL_HOSTS)
850 for_each_pmc_rcu(in_dev, im) {
851 if (im->multiaddr == group) {
859 static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
862 struct igmphdr *ih = igmp_hdr(skb);
863 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
864 struct ip_mc_list *im;
865 __be32 group = ih->group;
872 /* Alas, old v1 router presents here. */
874 max_delay = IGMP_Query_Response_Interval;
875 in_dev->mr_v1_seen = jiffies +
876 IGMP_V1_Router_Present_Timeout;
879 /* v2 router present */
880 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
881 in_dev->mr_v2_seen = jiffies +
882 IGMP_V2_Router_Present_Timeout;
884 /* cancel the interface change timer */
885 in_dev->mr_ifc_count = 0;
886 if (del_timer(&in_dev->mr_ifc_timer))
887 __in_dev_put(in_dev);
888 /* clear deleted report items */
889 igmpv3_clear_delrec(in_dev);
890 } else if (len < 12) {
891 return; /* ignore bogus packet; freed by caller */
892 } else if (IGMP_V1_SEEN(in_dev)) {
893 /* This is a v3 query with v1 queriers present */
894 max_delay = IGMP_Query_Response_Interval;
896 } else if (IGMP_V2_SEEN(in_dev)) {
897 /* this is a v3 query with v2 queriers present;
898 * Interpretation of the max_delay code is problematic here.
899 * A real v2 host would use ih_code directly, while v3 has a
900 * different encoding. We use the v3 encoding as more likely
901 * to be intended in a v3 query.
903 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
905 max_delay = 1; /* can't mod w/ 0 */
907 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
910 ih3 = igmpv3_query_hdr(skb);
912 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
913 + ntohs(ih3->nsrcs)*sizeof(__be32)))
915 ih3 = igmpv3_query_hdr(skb);
918 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
920 max_delay = 1; /* can't mod w/ 0 */
921 in_dev->mr_maxdelay = max_delay;
923 in_dev->mr_qrv = ih3->qrv;
924 if (!group) { /* general query */
926 return; /* no sources allowed */
927 igmp_gq_start_timer(in_dev);
930 /* mark sources to include, if group & source-specific */
931 mark = ih3->nsrcs != 0;
935 * - Start the timers in all of our membership records
936 * that the query applies to for the interface on
937 * which the query arrived excl. those that belong
938 * to a "local" group (224.0.0.X)
939 * - For timers already running check if they need to
941 * - Use the igmp->igmp_code field as the maximum
945 for_each_pmc_rcu(in_dev, im) {
948 if (group && group != im->multiaddr)
950 if (im->multiaddr == IGMP_ALL_HOSTS)
952 spin_lock_bh(&im->lock);
954 im->gsquery = im->gsquery && mark;
957 changed = !im->gsquery ||
958 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
959 spin_unlock_bh(&im->lock);
961 igmp_mod_timer(im, max_delay);
966 /* called in rcu_read_lock() section */
967 int igmp_rcv(struct sk_buff *skb)
969 /* This basically follows the spec line by line -- see RFC1112 */
971 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
977 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
980 switch (skb->ip_summed) {
981 case CHECKSUM_COMPLETE:
982 if (!csum_fold(skb->csum))
987 if (__skb_checksum_complete(skb))
993 case IGMP_HOST_MEMBERSHIP_QUERY:
994 igmp_heard_query(in_dev, skb, len);
996 case IGMP_HOST_MEMBERSHIP_REPORT:
997 case IGMPV2_HOST_MEMBERSHIP_REPORT:
998 /* Is it our report looped back? */
999 if (rt_is_output_route(skb_rtable(skb)))
1001 /* don't rely on MC router hearing unicast reports */
1002 if (skb->pkt_type == PACKET_MULTICAST ||
1003 skb->pkt_type == PACKET_BROADCAST)
1004 igmp_heard_report(in_dev, ih->group);
1007 #ifdef CONFIG_IP_PIMSM_V1
1008 return pim_rcv_v1(skb);
1010 case IGMPV3_HOST_MEMBERSHIP_REPORT:
1013 case IGMP_HOST_LEAVE_MESSAGE:
1015 case IGMP_MTRACE_RESP:
1030 * Add a filter to a device
1033 static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
1035 char buf[MAX_ADDR_LEN];
1036 struct net_device *dev = in_dev->dev;
1038 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1039 We will get multicast token leakage, when IFF_MULTICAST
1040 is changed. This check should be done in ndo_set_rx_mode
1041 routine. Something sort of:
1042 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1045 if (arp_mc_map(addr, buf, dev, 0) == 0)
1046 dev_mc_add(dev, buf);
1050 * Remove a filter from a device
1053 static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
1055 char buf[MAX_ADDR_LEN];
1056 struct net_device *dev = in_dev->dev;
1058 if (arp_mc_map(addr, buf, dev, 0) == 0)
1059 dev_mc_del(dev, buf);
1062 #ifdef CONFIG_IP_MULTICAST
1064 * deleted ip_mc_list manipulation
1066 static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1068 struct ip_mc_list *pmc;
1070 /* this is an "ip_mc_list" for convenience; only the fields below
1071 * are actually used. In particular, the refcnt and users are not
1072 * used for management of the delete list. Using the same structure
1073 * for deleted items allows change reports to use common code with
1074 * non-deleted or query-response MCA's.
1076 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
1079 spin_lock_bh(&im->lock);
1080 pmc->interface = im->interface;
1081 in_dev_hold(in_dev);
1082 pmc->multiaddr = im->multiaddr;
1083 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1084 IGMP_Unsolicited_Report_Count;
1085 pmc->sfmode = im->sfmode;
1086 if (pmc->sfmode == MCAST_INCLUDE) {
1087 struct ip_sf_list *psf;
1089 pmc->tomb = im->tomb;
1090 pmc->sources = im->sources;
1091 im->tomb = im->sources = NULL;
1092 for (psf=pmc->sources; psf; psf=psf->sf_next)
1093 psf->sf_crcount = pmc->crcount;
1095 spin_unlock_bh(&im->lock);
1097 spin_lock_bh(&in_dev->mc_tomb_lock);
1098 pmc->next = in_dev->mc_tomb;
1099 in_dev->mc_tomb = pmc;
1100 spin_unlock_bh(&in_dev->mc_tomb_lock);
1104 * restore ip_mc_list deleted records
1106 static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1108 struct ip_mc_list *pmc, *pmc_prev;
1109 struct ip_sf_list *psf;
1110 __be32 multiaddr = im->multiaddr;
1112 spin_lock_bh(&in_dev->mc_tomb_lock);
1114 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1115 if (pmc->multiaddr == multiaddr)
1121 pmc_prev->next = pmc->next;
1123 in_dev->mc_tomb = pmc->next;
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1127 spin_lock_bh(&im->lock);
1129 im->interface = pmc->interface;
1130 im->crcount = in_dev->mr_qrv ?: IGMP_Unsolicited_Report_Count;
1131 im->sfmode = pmc->sfmode;
1132 if (pmc->sfmode == MCAST_INCLUDE) {
1133 im->tomb = pmc->tomb;
1134 im->sources = pmc->sources;
1135 for (psf = im->sources; psf; psf = psf->sf_next)
1136 psf->sf_crcount = im->crcount;
1138 in_dev_put(pmc->interface);
1141 spin_unlock_bh(&im->lock);
1145 * flush ip_mc_list deleted records
1147 static void igmpv3_clear_delrec(struct in_device *in_dev)
1149 struct ip_mc_list *pmc, *nextpmc;
1151 spin_lock_bh(&in_dev->mc_tomb_lock);
1152 pmc = in_dev->mc_tomb;
1153 in_dev->mc_tomb = NULL;
1154 spin_unlock_bh(&in_dev->mc_tomb_lock);
1156 for (; pmc; pmc = nextpmc) {
1157 nextpmc = pmc->next;
1158 ip_mc_clear_src(pmc);
1159 in_dev_put(pmc->interface);
1162 /* clear dead sources, too */
1164 for_each_pmc_rcu(in_dev, pmc) {
1165 struct ip_sf_list *psf, *psf_next;
1167 spin_lock_bh(&pmc->lock);
1170 spin_unlock_bh(&pmc->lock);
1171 for (; psf; psf=psf_next) {
1172 psf_next = psf->sf_next;
1180 static void igmp_group_dropped(struct ip_mc_list *im)
1182 struct in_device *in_dev = im->interface;
1183 #ifdef CONFIG_IP_MULTICAST
1189 ip_mc_filter_del(in_dev, im->multiaddr);
1192 #ifdef CONFIG_IP_MULTICAST
1193 if (im->multiaddr == IGMP_ALL_HOSTS)
1196 reporter = im->reporter;
1197 igmp_stop_timer(im);
1199 if (!in_dev->dead) {
1200 if (IGMP_V1_SEEN(in_dev))
1202 if (IGMP_V2_SEEN(in_dev)) {
1204 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
1208 igmpv3_add_delrec(in_dev, im);
1210 igmp_ifc_event(in_dev);
1215 static void igmp_group_added(struct ip_mc_list *im)
1217 struct in_device *in_dev = im->interface;
1219 if (im->loaded == 0) {
1221 ip_mc_filter_add(in_dev, im->multiaddr);
1224 #ifdef CONFIG_IP_MULTICAST
1225 if (im->multiaddr == IGMP_ALL_HOSTS)
1230 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1231 spin_lock_bh(&im->lock);
1232 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1233 spin_unlock_bh(&im->lock);
1238 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1239 IGMP_Unsolicited_Report_Count;
1240 igmp_ifc_event(in_dev);
1246 * Multicast list managers
1251 * A socket has joined a multicast group on device dev.
1254 void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
1256 struct ip_mc_list *im;
1260 for_each_pmc_rtnl(in_dev, im) {
1261 if (im->multiaddr == addr) {
1263 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1268 im = kzalloc(sizeof(*im), GFP_KERNEL);
1273 im->interface = in_dev;
1274 in_dev_hold(in_dev);
1275 im->multiaddr = addr;
1276 /* initial mode is (EX, empty) */
1277 im->sfmode = MCAST_EXCLUDE;
1278 im->sfcount[MCAST_EXCLUDE] = 1;
1279 atomic_set(&im->refcnt, 1);
1280 spin_lock_init(&im->lock);
1281 #ifdef CONFIG_IP_MULTICAST
1282 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
1283 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
1286 im->next_rcu = in_dev->mc_list;
1288 rcu_assign_pointer(in_dev->mc_list, im);
1290 #ifdef CONFIG_IP_MULTICAST
1291 igmpv3_del_delrec(in_dev, im);
1293 igmp_group_added(im);
1295 ip_rt_multicast_event(in_dev);
1299 EXPORT_SYMBOL(ip_mc_inc_group);
1302 * Resend IGMP JOIN report; used for bonding.
1303 * Called with rcu_read_lock()
1305 void ip_mc_rejoin_groups(struct in_device *in_dev)
1307 #ifdef CONFIG_IP_MULTICAST
1308 struct ip_mc_list *im;
1311 for_each_pmc_rcu(in_dev, im) {
1312 if (im->multiaddr == IGMP_ALL_HOSTS)
1315 /* a failover is happening and switches
1316 * must be notified immediately
1318 if (IGMP_V1_SEEN(in_dev))
1319 type = IGMP_HOST_MEMBERSHIP_REPORT;
1320 else if (IGMP_V2_SEEN(in_dev))
1321 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1323 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1324 igmp_send_report(in_dev, im, type);
1328 EXPORT_SYMBOL(ip_mc_rejoin_groups);
1331 * A socket has left a multicast group on device dev
1334 void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
1336 struct ip_mc_list *i;
1337 struct ip_mc_list __rcu **ip;
1341 for (ip = &in_dev->mc_list;
1342 (i = rtnl_dereference(*ip)) != NULL;
1343 ip = &i->next_rcu) {
1344 if (i->multiaddr == addr) {
1345 if (--i->users == 0) {
1348 igmp_group_dropped(i);
1352 ip_rt_multicast_event(in_dev);
1361 EXPORT_SYMBOL(ip_mc_dec_group);
1363 /* Device changing type */
1365 void ip_mc_unmap(struct in_device *in_dev)
1367 struct ip_mc_list *pmc;
1371 for_each_pmc_rtnl(in_dev, pmc)
1372 igmp_group_dropped(pmc);
1375 void ip_mc_remap(struct in_device *in_dev)
1377 struct ip_mc_list *pmc;
1381 for_each_pmc_rtnl(in_dev, pmc) {
1382 #ifdef CONFIG_IP_MULTICAST
1383 igmpv3_del_delrec(in_dev, pmc);
1385 igmp_group_added(pmc);
1389 /* Device going down */
1391 void ip_mc_down(struct in_device *in_dev)
1393 struct ip_mc_list *pmc;
1397 for_each_pmc_rtnl(in_dev, pmc)
1398 igmp_group_dropped(pmc);
1400 #ifdef CONFIG_IP_MULTICAST
1401 in_dev->mr_ifc_count = 0;
1402 if (del_timer(&in_dev->mr_ifc_timer))
1403 __in_dev_put(in_dev);
1404 in_dev->mr_gq_running = 0;
1405 if (del_timer(&in_dev->mr_gq_timer))
1406 __in_dev_put(in_dev);
1409 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1412 void ip_mc_init_dev(struct in_device *in_dev)
1416 in_dev->mc_tomb = NULL;
1417 #ifdef CONFIG_IP_MULTICAST
1418 in_dev->mr_gq_running = 0;
1419 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1420 (unsigned long)in_dev);
1421 in_dev->mr_ifc_count = 0;
1422 in_dev->mc_count = 0;
1423 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1424 (unsigned long)in_dev);
1425 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1428 spin_lock_init(&in_dev->mc_tomb_lock);
1431 /* Device going up */
1433 void ip_mc_up(struct in_device *in_dev)
1435 struct ip_mc_list *pmc;
1439 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1441 for_each_pmc_rtnl(in_dev, pmc) {
1442 #ifdef CONFIG_IP_MULTICAST
1443 igmpv3_del_delrec(in_dev, pmc);
1445 igmp_group_added(pmc);
1450 * Device is about to be destroyed: clean up.
1453 void ip_mc_destroy_dev(struct in_device *in_dev)
1455 struct ip_mc_list *i;
1459 /* Deactivate timers */
1461 #ifdef CONFIG_IP_MULTICAST
1462 igmpv3_clear_delrec(in_dev);
1465 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1466 in_dev->mc_list = i->next_rcu;
1472 /* RTNL is locked */
1473 static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
1475 struct net_device *dev = NULL;
1476 struct in_device *idev = NULL;
1478 if (imr->imr_ifindex) {
1479 idev = inetdev_by_index(net, imr->imr_ifindex);
1482 if (imr->imr_address.s_addr) {
1483 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
1489 struct rtable *rt = ip_route_output(net,
1490 imr->imr_multiaddr.s_addr,
1498 imr->imr_ifindex = dev->ifindex;
1499 idev = __in_dev_get_rtnl(dev);
1505 * Join a socket to a group
1507 int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1508 int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
1511 static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
1514 struct ip_sf_list *psf, *psf_prev;
1518 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1519 if (psf->sf_inaddr == *psfsrc)
1523 if (!psf || psf->sf_count[sfmode] == 0) {
1524 /* source filter not found, or count wrong => bug */
1527 psf->sf_count[sfmode]--;
1528 if (psf->sf_count[sfmode] == 0) {
1529 ip_rt_multicast_event(pmc->interface);
1531 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1532 #ifdef CONFIG_IP_MULTICAST
1533 struct in_device *in_dev = pmc->interface;
1536 /* no more filters for this source */
1538 psf_prev->sf_next = psf->sf_next;
1540 pmc->sources = psf->sf_next;
1541 #ifdef CONFIG_IP_MULTICAST
1542 if (psf->sf_oldin &&
1543 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
1544 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1545 IGMP_Unsolicited_Report_Count;
1546 psf->sf_next = pmc->tomb;
1556 #ifndef CONFIG_IP_MULTICAST
1557 #define igmp_ifc_event(x) do { } while (0)
1560 static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1561 int sfcount, __be32 *psfsrc, int delta)
1563 struct ip_mc_list *pmc;
1570 for_each_pmc_rcu(in_dev, pmc) {
1571 if (*pmca == pmc->multiaddr)
1575 /* MCA not found?? bug */
1579 spin_lock_bh(&pmc->lock);
1581 #ifdef CONFIG_IP_MULTICAST
1586 if (!pmc->sfcount[sfmode])
1588 pmc->sfcount[sfmode]--;
1591 for (i=0; i<sfcount; i++) {
1592 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1594 changerec |= rv > 0;
1598 if (pmc->sfmode == MCAST_EXCLUDE &&
1599 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1600 pmc->sfcount[MCAST_INCLUDE]) {
1601 #ifdef CONFIG_IP_MULTICAST
1602 struct ip_sf_list *psf;
1605 /* filter mode change */
1606 pmc->sfmode = MCAST_INCLUDE;
1607 #ifdef CONFIG_IP_MULTICAST
1608 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1609 IGMP_Unsolicited_Report_Count;
1610 in_dev->mr_ifc_count = pmc->crcount;
1611 for (psf=pmc->sources; psf; psf = psf->sf_next)
1612 psf->sf_crcount = 0;
1613 igmp_ifc_event(pmc->interface);
1614 } else if (sf_setstate(pmc) || changerec) {
1615 igmp_ifc_event(pmc->interface);
1619 spin_unlock_bh(&pmc->lock);
1624 * Add multicast single-source filter to the interface list
1626 static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
1627 __be32 *psfsrc, int delta)
1629 struct ip_sf_list *psf, *psf_prev;
1632 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1633 if (psf->sf_inaddr == *psfsrc)
1638 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
1641 psf->sf_inaddr = *psfsrc;
1643 psf_prev->sf_next = psf;
1647 psf->sf_count[sfmode]++;
1648 if (psf->sf_count[sfmode] == 1) {
1649 ip_rt_multicast_event(pmc->interface);
1654 #ifdef CONFIG_IP_MULTICAST
1655 static void sf_markstate(struct ip_mc_list *pmc)
1657 struct ip_sf_list *psf;
1658 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1660 for (psf=pmc->sources; psf; psf=psf->sf_next)
1661 if (pmc->sfcount[MCAST_EXCLUDE]) {
1662 psf->sf_oldin = mca_xcount ==
1663 psf->sf_count[MCAST_EXCLUDE] &&
1664 !psf->sf_count[MCAST_INCLUDE];
1666 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1669 static int sf_setstate(struct ip_mc_list *pmc)
1671 struct ip_sf_list *psf, *dpsf;
1672 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1673 int qrv = pmc->interface->mr_qrv;
1677 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1678 if (pmc->sfcount[MCAST_EXCLUDE]) {
1679 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1680 !psf->sf_count[MCAST_INCLUDE];
1682 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
1684 if (!psf->sf_oldin) {
1685 struct ip_sf_list *prev = NULL;
1687 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1688 if (dpsf->sf_inaddr == psf->sf_inaddr)
1694 prev->sf_next = dpsf->sf_next;
1696 pmc->tomb = dpsf->sf_next;
1699 psf->sf_crcount = qrv;
1702 } else if (psf->sf_oldin) {
1704 psf->sf_crcount = 0;
1706 * add or update "delete" records if an active filter
1709 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1710 if (dpsf->sf_inaddr == psf->sf_inaddr)
1713 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
1717 /* pmc->lock held by callers */
1718 dpsf->sf_next = pmc->tomb;
1721 dpsf->sf_crcount = qrv;
1730 * Add multicast source filter list to the interface list
1732 static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1733 int sfcount, __be32 *psfsrc, int delta)
1735 struct ip_mc_list *pmc;
1742 for_each_pmc_rcu(in_dev, pmc) {
1743 if (*pmca == pmc->multiaddr)
1747 /* MCA not found?? bug */
1751 spin_lock_bh(&pmc->lock);
1754 #ifdef CONFIG_IP_MULTICAST
1757 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1759 pmc->sfcount[sfmode]++;
1761 for (i=0; i<sfcount; i++) {
1762 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta);
1770 pmc->sfcount[sfmode]--;
1772 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
1773 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1774 #ifdef CONFIG_IP_MULTICAST
1775 struct ip_sf_list *psf;
1776 in_dev = pmc->interface;
1779 /* filter mode change */
1780 if (pmc->sfcount[MCAST_EXCLUDE])
1781 pmc->sfmode = MCAST_EXCLUDE;
1782 else if (pmc->sfcount[MCAST_INCLUDE])
1783 pmc->sfmode = MCAST_INCLUDE;
1784 #ifdef CONFIG_IP_MULTICAST
1785 /* else no filters; keep old mode for reports */
1787 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1788 IGMP_Unsolicited_Report_Count;
1789 in_dev->mr_ifc_count = pmc->crcount;
1790 for (psf=pmc->sources; psf; psf = psf->sf_next)
1791 psf->sf_crcount = 0;
1792 igmp_ifc_event(in_dev);
1793 } else if (sf_setstate(pmc)) {
1794 igmp_ifc_event(in_dev);
1797 spin_unlock_bh(&pmc->lock);
1801 static void ip_mc_clear_src(struct ip_mc_list *pmc)
1803 struct ip_sf_list *psf, *nextpsf;
1805 for (psf=pmc->tomb; psf; psf=nextpsf) {
1806 nextpsf = psf->sf_next;
1810 for (psf=pmc->sources; psf; psf=nextpsf) {
1811 nextpsf = psf->sf_next;
1814 pmc->sources = NULL;
1815 pmc->sfmode = MCAST_EXCLUDE;
1816 pmc->sfcount[MCAST_INCLUDE] = 0;
1817 pmc->sfcount[MCAST_EXCLUDE] = 1;
1822 * Join a multicast group
1824 int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1827 __be32 addr = imr->imr_multiaddr.s_addr;
1828 struct ip_mc_socklist *iml = NULL, *i;
1829 struct in_device *in_dev;
1830 struct inet_sock *inet = inet_sk(sk);
1831 struct net *net = sock_net(sk);
1835 if (!ipv4_is_multicast(addr))
1840 in_dev = ip_mc_find_dev(net, imr);
1849 ifindex = imr->imr_ifindex;
1850 for_each_pmc_rtnl(inet, i) {
1851 if (i->multi.imr_multiaddr.s_addr == addr &&
1852 i->multi.imr_ifindex == ifindex)
1857 if (count >= sysctl_igmp_max_memberships)
1859 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
1863 memcpy(&iml->multi, imr, sizeof(*imr));
1864 iml->next_rcu = inet->mc_list;
1866 iml->sfmode = MCAST_EXCLUDE;
1867 rcu_assign_pointer(inet->mc_list, iml);
1868 ip_mc_inc_group(in_dev, addr);
1874 EXPORT_SYMBOL(ip_mc_join_group);
1876 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1877 struct in_device *in_dev)
1879 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
1883 /* any-source empty exclude case */
1884 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1885 iml->sfmode, 0, NULL, 0);
1887 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1888 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
1889 RCU_INIT_POINTER(iml->sflist, NULL);
1890 /* decrease mem now to avoid the memleak warning */
1891 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
1892 kfree_rcu(psf, rcu);
1897 * Ask a socket to leave a group.
1900 int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1902 struct inet_sock *inet = inet_sk(sk);
1903 struct ip_mc_socklist *iml;
1904 struct ip_mc_socklist __rcu **imlp;
1905 struct in_device *in_dev;
1906 struct net *net = sock_net(sk);
1907 __be32 group = imr->imr_multiaddr.s_addr;
1909 int ret = -EADDRNOTAVAIL;
1912 in_dev = ip_mc_find_dev(net, imr);
1913 if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) {
1917 ifindex = imr->imr_ifindex;
1918 for (imlp = &inet->mc_list;
1919 (iml = rtnl_dereference(*imlp)) != NULL;
1920 imlp = &iml->next_rcu) {
1921 if (iml->multi.imr_multiaddr.s_addr != group)
1924 if (iml->multi.imr_ifindex != ifindex)
1926 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1927 iml->multi.imr_address.s_addr)
1930 (void) ip_mc_leave_src(sk, iml, in_dev);
1932 *imlp = iml->next_rcu;
1935 ip_mc_dec_group(in_dev, group);
1937 /* decrease mem now to avoid the memleak warning */
1938 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
1939 kfree_rcu(iml, rcu);
1947 int ip_mc_source(int add, int omode, struct sock *sk, struct
1948 ip_mreq_source *mreqs, int ifindex)
1951 struct ip_mreqn imr;
1952 __be32 addr = mreqs->imr_multiaddr;
1953 struct ip_mc_socklist *pmc;
1954 struct in_device *in_dev = NULL;
1955 struct inet_sock *inet = inet_sk(sk);
1956 struct ip_sf_socklist *psl;
1957 struct net *net = sock_net(sk);
1961 if (!ipv4_is_multicast(addr))
1966 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1967 imr.imr_address.s_addr = mreqs->imr_interface;
1968 imr.imr_ifindex = ifindex;
1969 in_dev = ip_mc_find_dev(net, &imr);
1975 err = -EADDRNOTAVAIL;
1977 for_each_pmc_rtnl(inet, pmc) {
1978 if ((pmc->multi.imr_multiaddr.s_addr ==
1979 imr.imr_multiaddr.s_addr) &&
1980 (pmc->multi.imr_ifindex == imr.imr_ifindex))
1983 if (!pmc) { /* must have a prior join */
1987 /* if a source filter was set, must be the same mode as before */
1989 if (pmc->sfmode != omode) {
1993 } else if (pmc->sfmode != omode) {
1994 /* allow mode switches for empty-set filters */
1995 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
1996 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
1998 pmc->sfmode = omode;
2001 psl = rtnl_dereference(pmc->sflist);
2004 goto done; /* err = -EADDRNOTAVAIL */
2006 for (i=0; i<psl->sl_count; i++) {
2007 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2012 if (rv) /* source not found */
2013 goto done; /* err = -EADDRNOTAVAIL */
2015 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2016 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
2021 /* update the interface filter */
2022 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2023 &mreqs->imr_sourceaddr, 1);
2025 for (j=i+1; j<psl->sl_count; j++)
2026 psl->sl_addr[j-1] = psl->sl_addr[j];
2031 /* else, add a new source to the filter */
2033 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
2037 if (!psl || psl->sl_count == psl->sl_max) {
2038 struct ip_sf_socklist *newpsl;
2039 int count = IP_SFBLOCK;
2042 count += psl->sl_max;
2043 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
2048 newpsl->sl_max = count;
2049 newpsl->sl_count = count - IP_SFBLOCK;
2051 for (i=0; i<psl->sl_count; i++)
2052 newpsl->sl_addr[i] = psl->sl_addr[i];
2053 /* decrease mem now to avoid the memleak warning */
2054 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2055 kfree_rcu(psl, rcu);
2057 rcu_assign_pointer(pmc->sflist, newpsl);
2060 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2061 for (i=0; i<psl->sl_count; i++) {
2062 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
2067 if (rv == 0) /* address already there is an error */
2069 for (j=psl->sl_count-1; j>=i; j--)
2070 psl->sl_addr[j+1] = psl->sl_addr[j];
2071 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2074 /* update the interface list */
2075 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
2076 &mreqs->imr_sourceaddr, 1);
2080 return ip_mc_leave_group(sk, &imr);
2084 int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2087 struct ip_mreqn imr;
2088 __be32 addr = msf->imsf_multiaddr;
2089 struct ip_mc_socklist *pmc;
2090 struct in_device *in_dev;
2091 struct inet_sock *inet = inet_sk(sk);
2092 struct ip_sf_socklist *newpsl, *psl;
2093 struct net *net = sock_net(sk);
2096 if (!ipv4_is_multicast(addr))
2098 if (msf->imsf_fmode != MCAST_INCLUDE &&
2099 msf->imsf_fmode != MCAST_EXCLUDE)
2104 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2105 imr.imr_address.s_addr = msf->imsf_interface;
2106 imr.imr_ifindex = ifindex;
2107 in_dev = ip_mc_find_dev(net, &imr);
2114 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2115 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2120 for_each_pmc_rtnl(inet, pmc) {
2121 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2122 pmc->multi.imr_ifindex == imr.imr_ifindex)
2125 if (!pmc) { /* must have a prior join */
2129 if (msf->imsf_numsrc) {
2130 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2136 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2137 memcpy(newpsl->sl_addr, msf->imsf_slist,
2138 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2139 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2140 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2142 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2147 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2148 msf->imsf_fmode, 0, NULL, 0);
2150 psl = rtnl_dereference(pmc->sflist);
2152 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2153 psl->sl_count, psl->sl_addr, 0);
2154 /* decrease mem now to avoid the memleak warning */
2155 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
2156 kfree_rcu(psl, rcu);
2158 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2160 rcu_assign_pointer(pmc->sflist, newpsl);
2161 pmc->sfmode = msf->imsf_fmode;
2166 err = ip_mc_leave_group(sk, &imr);
2170 int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2171 struct ip_msfilter __user *optval, int __user *optlen)
2173 int err, len, count, copycount;
2174 struct ip_mreqn imr;
2175 __be32 addr = msf->imsf_multiaddr;
2176 struct ip_mc_socklist *pmc;
2177 struct in_device *in_dev;
2178 struct inet_sock *inet = inet_sk(sk);
2179 struct ip_sf_socklist *psl;
2180 struct net *net = sock_net(sk);
2182 if (!ipv4_is_multicast(addr))
2187 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2188 imr.imr_address.s_addr = msf->imsf_interface;
2189 imr.imr_ifindex = 0;
2190 in_dev = ip_mc_find_dev(net, &imr);
2196 err = -EADDRNOTAVAIL;
2198 for_each_pmc_rtnl(inet, pmc) {
2199 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2200 pmc->multi.imr_ifindex == imr.imr_ifindex)
2203 if (!pmc) /* must have a prior join */
2205 msf->imsf_fmode = pmc->sfmode;
2206 psl = rtnl_dereference(pmc->sflist);
2212 count = psl->sl_count;
2214 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2215 len = copycount * sizeof(psl->sl_addr[0]);
2216 msf->imsf_numsrc = count;
2217 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2218 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2222 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2230 int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2231 struct group_filter __user *optval, int __user *optlen)
2233 int err, i, count, copycount;
2234 struct sockaddr_in *psin;
2236 struct ip_mc_socklist *pmc;
2237 struct inet_sock *inet = inet_sk(sk);
2238 struct ip_sf_socklist *psl;
2240 psin = (struct sockaddr_in *)&gsf->gf_group;
2241 if (psin->sin_family != AF_INET)
2243 addr = psin->sin_addr.s_addr;
2244 if (!ipv4_is_multicast(addr))
2249 err = -EADDRNOTAVAIL;
2251 for_each_pmc_rtnl(inet, pmc) {
2252 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2253 pmc->multi.imr_ifindex == gsf->gf_interface)
2256 if (!pmc) /* must have a prior join */
2258 gsf->gf_fmode = pmc->sfmode;
2259 psl = rtnl_dereference(pmc->sflist);
2261 count = psl ? psl->sl_count : 0;
2262 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2263 gsf->gf_numsrc = count;
2264 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2265 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2268 for (i=0; i<copycount; i++) {
2269 struct sockaddr_storage ss;
2271 psin = (struct sockaddr_in *)&ss;
2272 memset(&ss, 0, sizeof(ss));
2273 psin->sin_family = AF_INET;
2274 psin->sin_addr.s_addr = psl->sl_addr[i];
2275 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2285 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2287 int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
2289 struct inet_sock *inet = inet_sk(sk);
2290 struct ip_mc_socklist *pmc;
2291 struct ip_sf_socklist *psl;
2296 if (!ipv4_is_multicast(loc_addr))
2300 for_each_pmc_rcu(inet, pmc) {
2301 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2302 pmc->multi.imr_ifindex == dif)
2308 psl = rcu_dereference(pmc->sflist);
2309 ret = (pmc->sfmode == MCAST_EXCLUDE);
2313 for (i=0; i<psl->sl_count; i++) {
2314 if (psl->sl_addr[i] == rmt_addr)
2318 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
2320 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
2330 * A socket is closing.
2333 void ip_mc_drop_socket(struct sock *sk)
2335 struct inet_sock *inet = inet_sk(sk);
2336 struct ip_mc_socklist *iml;
2337 struct net *net = sock_net(sk);
2339 if (inet->mc_list == NULL)
2343 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
2344 struct in_device *in_dev;
2346 inet->mc_list = iml->next_rcu;
2347 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
2348 (void) ip_mc_leave_src(sk, iml, in_dev);
2350 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
2351 /* decrease mem now to avoid the memleak warning */
2352 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
2353 kfree_rcu(iml, rcu);
2358 /* called with rcu_read_lock() */
2359 int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
2361 struct ip_mc_list *im;
2362 struct ip_sf_list *psf;
2365 for_each_pmc_rcu(in_dev, im) {
2366 if (im->multiaddr == mc_addr)
2369 if (im && proto == IPPROTO_IGMP) {
2373 for (psf=im->sources; psf; psf=psf->sf_next) {
2374 if (psf->sf_inaddr == src_addr)
2378 rv = psf->sf_count[MCAST_INCLUDE] ||
2379 psf->sf_count[MCAST_EXCLUDE] !=
2380 im->sfcount[MCAST_EXCLUDE];
2382 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2384 rv = 1; /* unspecified source; tentatively allow */
2389 #if defined(CONFIG_PROC_FS)
2390 struct igmp_mc_iter_state {
2391 struct seq_net_private p;
2392 struct net_device *dev;
2393 struct in_device *in_dev;
2396 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2398 static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2400 struct net *net = seq_file_net(seq);
2401 struct ip_mc_list *im = NULL;
2402 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2404 state->in_dev = NULL;
2405 for_each_netdev_rcu(net, state->dev) {
2406 struct in_device *in_dev;
2408 in_dev = __in_dev_get_rcu(state->dev);
2411 im = rcu_dereference(in_dev->mc_list);
2413 state->in_dev = in_dev;
2420 static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2422 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2424 im = rcu_dereference(im->next_rcu);
2426 state->dev = next_net_device_rcu(state->dev);
2428 state->in_dev = NULL;
2431 state->in_dev = __in_dev_get_rcu(state->dev);
2434 im = rcu_dereference(state->in_dev->mc_list);
2439 static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2441 struct ip_mc_list *im = igmp_mc_get_first(seq);
2443 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2445 return pos ? NULL : im;
2448 static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
2452 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2455 static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2457 struct ip_mc_list *im;
2458 if (v == SEQ_START_TOKEN)
2459 im = igmp_mc_get_first(seq);
2461 im = igmp_mc_get_next(seq, v);
2466 static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
2469 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2471 state->in_dev = NULL;
2476 static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2478 if (v == SEQ_START_TOKEN)
2480 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2482 struct ip_mc_list *im = (struct ip_mc_list *)v;
2483 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2485 #ifdef CONFIG_IP_MULTICAST
2486 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2487 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2493 if (rcu_dereference(state->in_dev->mc_list) == im) {
2494 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
2495 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
2499 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2500 im->multiaddr, im->users,
2501 im->tm_running, im->tm_running ?
2502 jiffies_to_clock_t(im->timer.expires-jiffies) : 0,
2508 static const struct seq_operations igmp_mc_seq_ops = {
2509 .start = igmp_mc_seq_start,
2510 .next = igmp_mc_seq_next,
2511 .stop = igmp_mc_seq_stop,
2512 .show = igmp_mc_seq_show,
2515 static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2517 return seq_open_net(inode, file, &igmp_mc_seq_ops,
2518 sizeof(struct igmp_mc_iter_state));
2521 static const struct file_operations igmp_mc_seq_fops = {
2522 .owner = THIS_MODULE,
2523 .open = igmp_mc_seq_open,
2525 .llseek = seq_lseek,
2526 .release = seq_release_net,
2529 struct igmp_mcf_iter_state {
2530 struct seq_net_private p;
2531 struct net_device *dev;
2532 struct in_device *idev;
2533 struct ip_mc_list *im;
2536 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2538 static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2540 struct net *net = seq_file_net(seq);
2541 struct ip_sf_list *psf = NULL;
2542 struct ip_mc_list *im = NULL;
2543 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2547 for_each_netdev_rcu(net, state->dev) {
2548 struct in_device *idev;
2549 idev = __in_dev_get_rcu(state->dev);
2550 if (unlikely(idev == NULL))
2552 im = rcu_dereference(idev->mc_list);
2553 if (likely(im != NULL)) {
2554 spin_lock_bh(&im->lock);
2556 if (likely(psf != NULL)) {
2561 spin_unlock_bh(&im->lock);
2567 static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2569 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2573 spin_unlock_bh(&state->im->lock);
2574 state->im = state->im->next;
2575 while (!state->im) {
2576 state->dev = next_net_device_rcu(state->dev);
2581 state->idev = __in_dev_get_rcu(state->dev);
2584 state->im = rcu_dereference(state->idev->mc_list);
2588 spin_lock_bh(&state->im->lock);
2589 psf = state->im->sources;
2595 static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2597 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2599 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2601 return pos ? NULL : psf;
2604 static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
2608 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2611 static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2613 struct ip_sf_list *psf;
2614 if (v == SEQ_START_TOKEN)
2615 psf = igmp_mcf_get_first(seq);
2617 psf = igmp_mcf_get_next(seq, v);
2622 static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
2625 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2626 if (likely(state->im != NULL)) {
2627 spin_unlock_bh(&state->im->lock);
2635 static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2637 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2638 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2640 if (v == SEQ_START_TOKEN) {
2643 "%10s %10s %6s %6s\n", "Idx",
2645 "SRC", "INC", "EXC");
2649 "0x%08x %6lu %6lu\n",
2650 state->dev->ifindex, state->dev->name,
2651 ntohl(state->im->multiaddr),
2652 ntohl(psf->sf_inaddr),
2653 psf->sf_count[MCAST_INCLUDE],
2654 psf->sf_count[MCAST_EXCLUDE]);
2659 static const struct seq_operations igmp_mcf_seq_ops = {
2660 .start = igmp_mcf_seq_start,
2661 .next = igmp_mcf_seq_next,
2662 .stop = igmp_mcf_seq_stop,
2663 .show = igmp_mcf_seq_show,
2666 static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2668 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
2669 sizeof(struct igmp_mcf_iter_state));
2672 static const struct file_operations igmp_mcf_seq_fops = {
2673 .owner = THIS_MODULE,
2674 .open = igmp_mcf_seq_open,
2676 .llseek = seq_lseek,
2677 .release = seq_release_net,
2680 static int __net_init igmp_net_init(struct net *net)
2682 struct proc_dir_entry *pde;
2684 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2687 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2693 proc_net_remove(net, "igmp");
2698 static void __net_exit igmp_net_exit(struct net *net)
2700 proc_net_remove(net, "mcfilter");
2701 proc_net_remove(net, "igmp");
2704 static struct pernet_operations igmp_net_ops = {
2705 .init = igmp_net_init,
2706 .exit = igmp_net_exit,
2709 int __init igmp_mc_proc_init(void)
2711 return register_pernet_subsys(&igmp_net_ops);