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
);
153 static void ip_mc_list_reclaim(struct rcu_head
*head
)
155 kfree(container_of(head
, struct ip_mc_list
, rcu
));
158 static void ip_ma_put(struct ip_mc_list
*im
)
160 if (atomic_dec_and_test(&im
->refcnt
)) {
161 in_dev_put(im
->interface
);
162 call_rcu(&im
->rcu
, ip_mc_list_reclaim
);
166 #define for_each_pmc_rcu(in_dev, pmc) \
167 for (pmc = rcu_dereference(in_dev->mc_list); \
169 pmc = rcu_dereference(pmc->next_rcu))
171 #define for_each_pmc_rtnl(in_dev, pmc) \
172 for (pmc = rtnl_dereference(in_dev->mc_list); \
174 pmc = rtnl_dereference(pmc->next_rcu))
176 #ifdef CONFIG_IP_MULTICAST
182 static void igmp_stop_timer(struct ip_mc_list
*im
)
184 spin_lock_bh(&im
->lock
);
185 if (del_timer(&im
->timer
))
186 atomic_dec(&im
->refcnt
);
189 im
->unsolicit_count
= 0;
190 spin_unlock_bh(&im
->lock
);
193 /* It must be called with locked im->lock */
194 static void igmp_start_timer(struct ip_mc_list
*im
, int max_delay
)
196 int tv
= net_random() % max_delay
;
199 if (!mod_timer(&im
->timer
, jiffies
+tv
+2))
200 atomic_inc(&im
->refcnt
);
203 static void igmp_gq_start_timer(struct in_device
*in_dev
)
205 int tv
= net_random() % in_dev
->mr_maxdelay
;
207 in_dev
->mr_gq_running
= 1;
208 if (!mod_timer(&in_dev
->mr_gq_timer
, jiffies
+tv
+2))
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 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, int size
)
308 struct igmpv3_report
*pig
;
309 struct net
*net
= dev_net(dev
);
311 skb
= alloc_skb(size
+ LL_ALLOCATED_SPACE(dev
), GFP_ATOMIC
);
316 struct flowi fl
= { .oif
= dev
->ifindex
,
317 .fl4_dst
= IGMPV3_ALL_MCR
,
318 .proto
= IPPROTO_IGMP
};
319 if (ip_route_output_key(net
, &rt
, &fl
)) {
324 if (rt
->rt_src
== 0) {
330 skb_dst_set(skb
, &rt
->dst
);
333 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
335 skb_reset_network_header(skb
);
337 skb_put(skb
, sizeof(struct iphdr
) + 4);
340 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
342 pip
->frag_off
= htons(IP_DF
);
344 pip
->daddr
= rt
->rt_dst
;
345 pip
->saddr
= rt
->rt_src
;
346 pip
->protocol
= IPPROTO_IGMP
;
347 pip
->tot_len
= 0; /* filled in later */
348 ip_select_ident(pip
, &rt
->dst
, NULL
);
349 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
350 ((u8
*)&pip
[1])[1] = 4;
351 ((u8
*)&pip
[1])[2] = 0;
352 ((u8
*)&pip
[1])[3] = 0;
354 skb
->transport_header
= skb
->network_header
+ sizeof(struct iphdr
) + 4;
355 skb_put(skb
, sizeof(*pig
));
356 pig
= igmpv3_report_hdr(skb
);
357 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
365 static int igmpv3_sendpack(struct sk_buff
*skb
)
367 struct igmphdr
*pig
= igmp_hdr(skb
);
368 const int igmplen
= skb
->tail
- skb
->transport_header
;
370 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
372 return ip_local_out(skb
);
375 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
377 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
, type
, gdel
, sdel
);
380 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
381 int type
, struct igmpv3_grec
**ppgr
)
383 struct net_device
*dev
= pmc
->interface
->dev
;
384 struct igmpv3_report
*pih
;
385 struct igmpv3_grec
*pgr
;
388 skb
= igmpv3_newpack(dev
, dev
->mtu
);
391 pgr
= (struct igmpv3_grec
*)skb_put(skb
, sizeof(struct igmpv3_grec
));
392 pgr
->grec_type
= type
;
393 pgr
->grec_auxwords
= 0;
395 pgr
->grec_mca
= pmc
->multiaddr
;
396 pih
= igmpv3_report_hdr(skb
);
397 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
402 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
403 skb_tailroom(skb)) : 0)
405 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
406 int type
, int gdeleted
, int sdeleted
)
408 struct net_device
*dev
= pmc
->interface
->dev
;
409 struct igmpv3_report
*pih
;
410 struct igmpv3_grec
*pgr
= NULL
;
411 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
412 int scount
, stotal
, first
, isquery
, truncate
;
414 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
417 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
418 type
== IGMPV3_MODE_IS_EXCLUDE
;
419 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
420 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
424 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
429 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
431 /* EX and TO_EX get a fresh packet, if needed */
433 if (pih
&& pih
->ngrec
&&
434 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
436 igmpv3_sendpack(skb
);
437 skb
= igmpv3_newpack(dev
, dev
->mtu
);
442 for (psf
=*psf_list
; psf
; psf
=psf_next
) {
445 psf_next
= psf
->sf_next
;
447 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
452 /* clear marks on query responses */
456 if (AVAILABLE(skb
) < sizeof(__be32
) +
457 first
*sizeof(struct igmpv3_grec
)) {
458 if (truncate
&& !first
)
459 break; /* truncate these */
461 pgr
->grec_nsrcs
= htons(scount
);
463 igmpv3_sendpack(skb
);
464 skb
= igmpv3_newpack(dev
, dev
->mtu
);
469 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
474 psrc
= (__be32
*)skb_put(skb
, sizeof(__be32
));
475 *psrc
= psf
->sf_inaddr
;
477 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
478 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
480 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
482 psf_prev
->sf_next
= psf
->sf_next
;
484 *psf_list
= psf
->sf_next
;
494 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
495 type
== IGMPV3_BLOCK_OLD_SOURCES
)
497 if (pmc
->crcount
|| isquery
) {
498 /* make sure we have room for group header */
499 if (skb
&& AVAILABLE(skb
)<sizeof(struct igmpv3_grec
)) {
500 igmpv3_sendpack(skb
);
501 skb
= NULL
; /* add_grhead will get a new one */
503 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
507 pgr
->grec_nsrcs
= htons(scount
);
510 pmc
->gsquery
= 0; /* clear query state on report */
514 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
516 struct sk_buff
*skb
= NULL
;
521 for_each_pmc_rcu(in_dev
, pmc
) {
522 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
524 spin_lock_bh(&pmc
->lock
);
525 if (pmc
->sfcount
[MCAST_EXCLUDE
])
526 type
= IGMPV3_MODE_IS_EXCLUDE
;
528 type
= IGMPV3_MODE_IS_INCLUDE
;
529 skb
= add_grec(skb
, pmc
, type
, 0, 0);
530 spin_unlock_bh(&pmc
->lock
);
534 spin_lock_bh(&pmc
->lock
);
535 if (pmc
->sfcount
[MCAST_EXCLUDE
])
536 type
= IGMPV3_MODE_IS_EXCLUDE
;
538 type
= IGMPV3_MODE_IS_INCLUDE
;
539 skb
= add_grec(skb
, pmc
, type
, 0, 0);
540 spin_unlock_bh(&pmc
->lock
);
544 return igmpv3_sendpack(skb
);
548 * remove zero-count source records from a source filter list
550 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
552 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
555 for (psf
=*ppsf
; psf
; psf
= psf_next
) {
556 psf_next
= psf
->sf_next
;
557 if (psf
->sf_crcount
== 0) {
559 psf_prev
->sf_next
= psf
->sf_next
;
561 *ppsf
= psf
->sf_next
;
568 static void igmpv3_send_cr(struct in_device
*in_dev
)
570 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
571 struct sk_buff
*skb
= NULL
;
575 spin_lock_bh(&in_dev
->mc_tomb_lock
);
579 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc_next
) {
580 pmc_next
= pmc
->next
;
581 if (pmc
->sfmode
== MCAST_INCLUDE
) {
582 type
= IGMPV3_BLOCK_OLD_SOURCES
;
583 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
584 skb
= add_grec(skb
, pmc
, type
, 1, 0);
585 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
588 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
589 type
= IGMPV3_CHANGE_TO_INCLUDE
;
590 skb
= add_grec(skb
, pmc
, type
, 1, 0);
593 if (pmc
->crcount
== 0) {
594 igmpv3_clear_zeros(&pmc
->tomb
);
595 igmpv3_clear_zeros(&pmc
->sources
);
598 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
600 pmc_prev
->next
= pmc_next
;
602 in_dev
->mc_tomb
= pmc_next
;
603 in_dev_put(pmc
->interface
);
608 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
611 for_each_pmc_rcu(in_dev
, pmc
) {
612 spin_lock_bh(&pmc
->lock
);
613 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
614 type
= IGMPV3_BLOCK_OLD_SOURCES
;
615 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
617 type
= IGMPV3_ALLOW_NEW_SOURCES
;
618 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
620 skb
= add_grec(skb
, pmc
, type
, 0, 0);
621 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
623 /* filter mode changes */
625 if (pmc
->sfmode
== MCAST_EXCLUDE
)
626 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
628 type
= IGMPV3_CHANGE_TO_INCLUDE
;
629 skb
= add_grec(skb
, pmc
, type
, 0, 0);
632 spin_unlock_bh(&pmc
->lock
);
638 (void) igmpv3_sendpack(skb
);
641 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
648 struct net_device
*dev
= in_dev
->dev
;
649 struct net
*net
= dev_net(dev
);
650 __be32 group
= pmc
? pmc
->multiaddr
: 0;
653 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
654 return igmpv3_send_report(in_dev
, pmc
);
655 else if (type
== IGMP_HOST_LEAVE_MESSAGE
)
656 dst
= IGMP_ALL_ROUTER
;
661 struct flowi fl
= { .oif
= dev
->ifindex
,
663 .proto
= IPPROTO_IGMP
};
664 if (ip_route_output_key(net
, &rt
, &fl
))
667 if (rt
->rt_src
== 0) {
672 skb
= alloc_skb(IGMP_SIZE
+LL_ALLOCATED_SPACE(dev
), GFP_ATOMIC
);
678 skb_dst_set(skb
, &rt
->dst
);
680 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
682 skb_reset_network_header(skb
);
684 skb_put(skb
, sizeof(struct iphdr
) + 4);
687 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
689 iph
->frag_off
= htons(IP_DF
);
692 iph
->saddr
= rt
->rt_src
;
693 iph
->protocol
= IPPROTO_IGMP
;
694 ip_select_ident(iph
, &rt
->dst
, NULL
);
695 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
696 ((u8
*)&iph
[1])[1] = 4;
697 ((u8
*)&iph
[1])[2] = 0;
698 ((u8
*)&iph
[1])[3] = 0;
700 ih
= (struct igmphdr
*)skb_put(skb
, sizeof(struct igmphdr
));
705 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
707 return ip_local_out(skb
);
710 static void igmp_gq_timer_expire(unsigned long data
)
712 struct in_device
*in_dev
= (struct in_device
*)data
;
714 in_dev
->mr_gq_running
= 0;
715 igmpv3_send_report(in_dev
, NULL
);
716 __in_dev_put(in_dev
);
719 static void igmp_ifc_timer_expire(unsigned long data
)
721 struct in_device
*in_dev
= (struct in_device
*)data
;
723 igmpv3_send_cr(in_dev
);
724 if (in_dev
->mr_ifc_count
) {
725 in_dev
->mr_ifc_count
--;
726 igmp_ifc_start_timer(in_dev
, IGMP_Unsolicited_Report_Interval
);
728 __in_dev_put(in_dev
);
731 static void igmp_ifc_event(struct in_device
*in_dev
)
733 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
735 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
736 IGMP_Unsolicited_Report_Count
;
737 igmp_ifc_start_timer(in_dev
, 1);
741 static void igmp_timer_expire(unsigned long data
)
743 struct ip_mc_list
*im
=(struct ip_mc_list
*)data
;
744 struct in_device
*in_dev
= im
->interface
;
746 spin_lock(&im
->lock
);
749 if (im
->unsolicit_count
) {
750 im
->unsolicit_count
--;
751 igmp_start_timer(im
, IGMP_Unsolicited_Report_Interval
);
754 spin_unlock(&im
->lock
);
756 if (IGMP_V1_SEEN(in_dev
))
757 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
758 else if (IGMP_V2_SEEN(in_dev
))
759 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
761 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
766 /* mark EXCLUDE-mode sources */
767 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
769 struct ip_sf_list
*psf
;
773 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
776 for (i
=0; i
<nsrcs
; i
++) {
777 /* skip inactive filters */
778 if (pmc
->sfcount
[MCAST_INCLUDE
] ||
779 pmc
->sfcount
[MCAST_EXCLUDE
] !=
780 psf
->sf_count
[MCAST_EXCLUDE
])
782 if (srcs
[i
] == psf
->sf_inaddr
) {
789 if (scount
== nsrcs
) /* all sources excluded */
794 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
796 struct ip_sf_list
*psf
;
799 if (pmc
->sfmode
== MCAST_EXCLUDE
)
800 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
802 /* mark INCLUDE-mode sources */
804 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
807 for (i
=0; i
<nsrcs
; i
++)
808 if (srcs
[i
] == psf
->sf_inaddr
) {
822 static void igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
824 struct ip_mc_list
*im
;
826 /* Timers are only set for non-local groups */
828 if (group
== IGMP_ALL_HOSTS
)
832 for_each_pmc_rcu(in_dev
, im
) {
833 if (im
->multiaddr
== group
) {
841 static void igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
844 struct igmphdr
*ih
= igmp_hdr(skb
);
845 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
846 struct ip_mc_list
*im
;
847 __be32 group
= ih
->group
;
854 /* Alas, old v1 router presents here. */
856 max_delay
= IGMP_Query_Response_Interval
;
857 in_dev
->mr_v1_seen
= jiffies
+
858 IGMP_V1_Router_Present_Timeout
;
861 /* v2 router present */
862 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
863 in_dev
->mr_v2_seen
= jiffies
+
864 IGMP_V2_Router_Present_Timeout
;
866 /* cancel the interface change timer */
867 in_dev
->mr_ifc_count
= 0;
868 if (del_timer(&in_dev
->mr_ifc_timer
))
869 __in_dev_put(in_dev
);
870 /* clear deleted report items */
871 igmpv3_clear_delrec(in_dev
);
872 } else if (len
< 12) {
873 return; /* ignore bogus packet; freed by caller */
874 } else if (IGMP_V1_SEEN(in_dev
)) {
875 /* This is a v3 query with v1 queriers present */
876 max_delay
= IGMP_Query_Response_Interval
;
878 } else if (IGMP_V2_SEEN(in_dev
)) {
879 /* this is a v3 query with v2 queriers present;
880 * Interpretation of the max_delay code is problematic here.
881 * A real v2 host would use ih_code directly, while v3 has a
882 * different encoding. We use the v3 encoding as more likely
883 * to be intended in a v3 query.
885 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
887 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
890 ih3
= igmpv3_query_hdr(skb
);
892 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
893 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
895 ih3
= igmpv3_query_hdr(skb
);
898 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
900 max_delay
= 1; /* can't mod w/ 0 */
901 in_dev
->mr_maxdelay
= max_delay
;
903 in_dev
->mr_qrv
= ih3
->qrv
;
904 if (!group
) { /* general query */
906 return; /* no sources allowed */
907 igmp_gq_start_timer(in_dev
);
910 /* mark sources to include, if group & source-specific */
911 mark
= ih3
->nsrcs
!= 0;
915 * - Start the timers in all of our membership records
916 * that the query applies to for the interface on
917 * which the query arrived excl. those that belong
918 * to a "local" group (224.0.0.X)
919 * - For timers already running check if they need to
921 * - Use the igmp->igmp_code field as the maximum
925 for_each_pmc_rcu(in_dev
, im
) {
928 if (group
&& group
!= im
->multiaddr
)
930 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
932 spin_lock_bh(&im
->lock
);
934 im
->gsquery
= im
->gsquery
&& mark
;
937 changed
= !im
->gsquery
||
938 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
939 spin_unlock_bh(&im
->lock
);
941 igmp_mod_timer(im
, max_delay
);
946 /* called in rcu_read_lock() section */
947 int igmp_rcv(struct sk_buff
*skb
)
949 /* This basically follows the spec line by line -- see RFC1112 */
951 struct in_device
*in_dev
= __in_dev_get_rcu(skb
->dev
);
957 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
960 switch (skb
->ip_summed
) {
961 case CHECKSUM_COMPLETE
:
962 if (!csum_fold(skb
->csum
))
967 if (__skb_checksum_complete(skb
))
973 case IGMP_HOST_MEMBERSHIP_QUERY
:
974 igmp_heard_query(in_dev
, skb
, len
);
976 case IGMP_HOST_MEMBERSHIP_REPORT
:
977 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
978 /* Is it our report looped back? */
979 if (rt_is_output_route(skb_rtable(skb
)))
981 /* don't rely on MC router hearing unicast reports */
982 if (skb
->pkt_type
== PACKET_MULTICAST
||
983 skb
->pkt_type
== PACKET_BROADCAST
)
984 igmp_heard_report(in_dev
, ih
->group
);
987 #ifdef CONFIG_IP_PIMSM_V1
988 return pim_rcv_v1(skb
);
990 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
993 case IGMP_HOST_LEAVE_MESSAGE
:
995 case IGMP_MTRACE_RESP
:
1010 * Add a filter to a device
1013 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
1015 char buf
[MAX_ADDR_LEN
];
1016 struct net_device
*dev
= in_dev
->dev
;
1018 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1019 We will get multicast token leakage, when IFF_MULTICAST
1020 is changed. This check should be done in dev->set_multicast_list
1021 routine. Something sort of:
1022 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1025 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1026 dev_mc_add(dev
, buf
);
1030 * Remove a filter from a device
1033 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1035 char buf
[MAX_ADDR_LEN
];
1036 struct net_device
*dev
= in_dev
->dev
;
1038 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1039 dev_mc_del(dev
, buf
);
1042 #ifdef CONFIG_IP_MULTICAST
1044 * deleted ip_mc_list manipulation
1046 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1048 struct ip_mc_list
*pmc
;
1050 /* this is an "ip_mc_list" for convenience; only the fields below
1051 * are actually used. In particular, the refcnt and users are not
1052 * used for management of the delete list. Using the same structure
1053 * for deleted items allows change reports to use common code with
1054 * non-deleted or query-response MCA's.
1056 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1059 spin_lock_bh(&im
->lock
);
1060 pmc
->interface
= im
->interface
;
1061 in_dev_hold(in_dev
);
1062 pmc
->multiaddr
= im
->multiaddr
;
1063 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1064 IGMP_Unsolicited_Report_Count
;
1065 pmc
->sfmode
= im
->sfmode
;
1066 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1067 struct ip_sf_list
*psf
;
1069 pmc
->tomb
= im
->tomb
;
1070 pmc
->sources
= im
->sources
;
1071 im
->tomb
= im
->sources
= NULL
;
1072 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1073 psf
->sf_crcount
= pmc
->crcount
;
1075 spin_unlock_bh(&im
->lock
);
1077 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1078 pmc
->next
= in_dev
->mc_tomb
;
1079 in_dev
->mc_tomb
= pmc
;
1080 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1083 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
)
1085 struct ip_mc_list
*pmc
, *pmc_prev
;
1086 struct ip_sf_list
*psf
, *psf_next
;
1088 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1090 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc
->next
) {
1091 if (pmc
->multiaddr
== multiaddr
)
1097 pmc_prev
->next
= pmc
->next
;
1099 in_dev
->mc_tomb
= pmc
->next
;
1101 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1103 for (psf
=pmc
->tomb
; psf
; psf
=psf_next
) {
1104 psf_next
= psf
->sf_next
;
1107 in_dev_put(pmc
->interface
);
1112 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1114 struct ip_mc_list
*pmc
, *nextpmc
;
1116 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1117 pmc
= in_dev
->mc_tomb
;
1118 in_dev
->mc_tomb
= NULL
;
1119 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1121 for (; pmc
; pmc
= nextpmc
) {
1122 nextpmc
= pmc
->next
;
1123 ip_mc_clear_src(pmc
);
1124 in_dev_put(pmc
->interface
);
1127 /* clear dead sources, too */
1129 for_each_pmc_rcu(in_dev
, pmc
) {
1130 struct ip_sf_list
*psf
, *psf_next
;
1132 spin_lock_bh(&pmc
->lock
);
1135 spin_unlock_bh(&pmc
->lock
);
1136 for (; psf
; psf
=psf_next
) {
1137 psf_next
= psf
->sf_next
;
1145 static void igmp_group_dropped(struct ip_mc_list
*im
)
1147 struct in_device
*in_dev
= im
->interface
;
1148 #ifdef CONFIG_IP_MULTICAST
1154 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1157 #ifdef CONFIG_IP_MULTICAST
1158 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1161 reporter
= im
->reporter
;
1162 igmp_stop_timer(im
);
1164 if (!in_dev
->dead
) {
1165 if (IGMP_V1_SEEN(in_dev
))
1167 if (IGMP_V2_SEEN(in_dev
)) {
1169 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1173 igmpv3_add_delrec(in_dev
, im
);
1175 igmp_ifc_event(in_dev
);
1179 ip_mc_clear_src(im
);
1182 static void igmp_group_added(struct ip_mc_list
*im
)
1184 struct in_device
*in_dev
= im
->interface
;
1186 if (im
->loaded
== 0) {
1188 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1191 #ifdef CONFIG_IP_MULTICAST
1192 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1197 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1198 spin_lock_bh(&im
->lock
);
1199 igmp_start_timer(im
, IGMP_Initial_Report_Delay
);
1200 spin_unlock_bh(&im
->lock
);
1205 im
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1206 IGMP_Unsolicited_Report_Count
;
1207 igmp_ifc_event(in_dev
);
1213 * Multicast list managers
1218 * A socket has joined a multicast group on device dev.
1221 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1223 struct ip_mc_list
*im
;
1227 for_each_pmc_rtnl(in_dev
, im
) {
1228 if (im
->multiaddr
== addr
) {
1230 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1235 im
= kzalloc(sizeof(*im
), GFP_KERNEL
);
1240 im
->interface
= in_dev
;
1241 in_dev_hold(in_dev
);
1242 im
->multiaddr
= addr
;
1243 /* initial mode is (EX, empty) */
1244 im
->sfmode
= MCAST_EXCLUDE
;
1245 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1246 atomic_set(&im
->refcnt
, 1);
1247 spin_lock_init(&im
->lock
);
1248 #ifdef CONFIG_IP_MULTICAST
1249 setup_timer(&im
->timer
, &igmp_timer_expire
, (unsigned long)im
);
1250 im
->unsolicit_count
= IGMP_Unsolicited_Report_Count
;
1253 im
->next_rcu
= in_dev
->mc_list
;
1255 rcu_assign_pointer(in_dev
->mc_list
, im
);
1257 #ifdef CONFIG_IP_MULTICAST
1258 igmpv3_del_delrec(in_dev
, im
->multiaddr
);
1260 igmp_group_added(im
);
1262 ip_rt_multicast_event(in_dev
);
1266 EXPORT_SYMBOL(ip_mc_inc_group
);
1269 * Resend IGMP JOIN report; used for bonding.
1271 void ip_mc_rejoin_group(struct ip_mc_list
*im
)
1273 #ifdef CONFIG_IP_MULTICAST
1274 struct in_device
*in_dev
= im
->interface
;
1276 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1279 /* a failover is happening and switches
1280 * must be notified immediately */
1281 if (IGMP_V1_SEEN(in_dev
))
1282 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
1283 else if (IGMP_V2_SEEN(in_dev
))
1284 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
1286 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
1289 EXPORT_SYMBOL(ip_mc_rejoin_group
);
1292 * A socket has left a multicast group on device dev
1295 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1297 struct ip_mc_list
*i
;
1298 struct ip_mc_list __rcu
**ip
;
1302 for (ip
= &in_dev
->mc_list
;
1303 (i
= rtnl_dereference(*ip
)) != NULL
;
1304 ip
= &i
->next_rcu
) {
1305 if (i
->multiaddr
== addr
) {
1306 if (--i
->users
== 0) {
1309 igmp_group_dropped(i
);
1312 ip_rt_multicast_event(in_dev
);
1321 EXPORT_SYMBOL(ip_mc_dec_group
);
1323 /* Device changing type */
1325 void ip_mc_unmap(struct in_device
*in_dev
)
1327 struct ip_mc_list
*pmc
;
1331 for_each_pmc_rtnl(in_dev
, pmc
)
1332 igmp_group_dropped(pmc
);
1335 void ip_mc_remap(struct in_device
*in_dev
)
1337 struct ip_mc_list
*pmc
;
1341 for_each_pmc_rtnl(in_dev
, pmc
)
1342 igmp_group_added(pmc
);
1345 /* Device going down */
1347 void ip_mc_down(struct in_device
*in_dev
)
1349 struct ip_mc_list
*pmc
;
1353 for_each_pmc_rtnl(in_dev
, pmc
)
1354 igmp_group_dropped(pmc
);
1356 #ifdef CONFIG_IP_MULTICAST
1357 in_dev
->mr_ifc_count
= 0;
1358 if (del_timer(&in_dev
->mr_ifc_timer
))
1359 __in_dev_put(in_dev
);
1360 in_dev
->mr_gq_running
= 0;
1361 if (del_timer(&in_dev
->mr_gq_timer
))
1362 __in_dev_put(in_dev
);
1363 igmpv3_clear_delrec(in_dev
);
1366 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1369 void ip_mc_init_dev(struct in_device
*in_dev
)
1373 in_dev
->mc_tomb
= NULL
;
1374 #ifdef CONFIG_IP_MULTICAST
1375 in_dev
->mr_gq_running
= 0;
1376 setup_timer(&in_dev
->mr_gq_timer
, igmp_gq_timer_expire
,
1377 (unsigned long)in_dev
);
1378 in_dev
->mr_ifc_count
= 0;
1379 in_dev
->mc_count
= 0;
1380 setup_timer(&in_dev
->mr_ifc_timer
, igmp_ifc_timer_expire
,
1381 (unsigned long)in_dev
);
1382 in_dev
->mr_qrv
= IGMP_Unsolicited_Report_Count
;
1385 spin_lock_init(&in_dev
->mc_tomb_lock
);
1388 /* Device going up */
1390 void ip_mc_up(struct in_device
*in_dev
)
1392 struct ip_mc_list
*pmc
;
1396 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1398 for_each_pmc_rtnl(in_dev
, pmc
)
1399 igmp_group_added(pmc
);
1403 * Device is about to be destroyed: clean up.
1406 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1408 struct ip_mc_list
*i
;
1412 /* Deactivate timers */
1415 while ((i
= rtnl_dereference(in_dev
->mc_list
)) != NULL
) {
1416 in_dev
->mc_list
= i
->next_rcu
;
1419 igmp_group_dropped(i
);
1424 /* RTNL is locked */
1425 static struct in_device
*ip_mc_find_dev(struct net
*net
, struct ip_mreqn
*imr
)
1427 struct flowi fl
= { .fl4_dst
= imr
->imr_multiaddr
.s_addr
};
1429 struct net_device
*dev
= NULL
;
1430 struct in_device
*idev
= NULL
;
1432 if (imr
->imr_ifindex
) {
1433 idev
= inetdev_by_index(net
, imr
->imr_ifindex
);
1436 if (imr
->imr_address
.s_addr
) {
1437 dev
= __ip_dev_find(net
, imr
->imr_address
.s_addr
, false);
1442 if (!dev
&& !ip_route_output_key(net
, &rt
, &fl
)) {
1447 imr
->imr_ifindex
= dev
->ifindex
;
1448 idev
= __in_dev_get_rtnl(dev
);
1454 * Join a socket to a group
1456 int sysctl_igmp_max_memberships __read_mostly
= IP_MAX_MEMBERSHIPS
;
1457 int sysctl_igmp_max_msf __read_mostly
= IP_MAX_MSF
;
1460 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1463 struct ip_sf_list
*psf
, *psf_prev
;
1467 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1468 if (psf
->sf_inaddr
== *psfsrc
)
1472 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1473 /* source filter not found, or count wrong => bug */
1476 psf
->sf_count
[sfmode
]--;
1477 if (psf
->sf_count
[sfmode
] == 0) {
1478 ip_rt_multicast_event(pmc
->interface
);
1480 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1481 #ifdef CONFIG_IP_MULTICAST
1482 struct in_device
*in_dev
= pmc
->interface
;
1485 /* no more filters for this source */
1487 psf_prev
->sf_next
= psf
->sf_next
;
1489 pmc
->sources
= psf
->sf_next
;
1490 #ifdef CONFIG_IP_MULTICAST
1491 if (psf
->sf_oldin
&&
1492 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1493 psf
->sf_crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1494 IGMP_Unsolicited_Report_Count
;
1495 psf
->sf_next
= pmc
->tomb
;
1505 #ifndef CONFIG_IP_MULTICAST
1506 #define igmp_ifc_event(x) do { } while (0)
1509 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1510 int sfcount
, __be32
*psfsrc
, int delta
)
1512 struct ip_mc_list
*pmc
;
1519 for_each_pmc_rcu(in_dev
, pmc
) {
1520 if (*pmca
== pmc
->multiaddr
)
1524 /* MCA not found?? bug */
1528 spin_lock_bh(&pmc
->lock
);
1530 #ifdef CONFIG_IP_MULTICAST
1535 if (!pmc
->sfcount
[sfmode
])
1537 pmc
->sfcount
[sfmode
]--;
1540 for (i
=0; i
<sfcount
; i
++) {
1541 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1543 changerec
|= rv
> 0;
1547 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1548 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1549 pmc
->sfcount
[MCAST_INCLUDE
]) {
1550 #ifdef CONFIG_IP_MULTICAST
1551 struct ip_sf_list
*psf
;
1554 /* filter mode change */
1555 pmc
->sfmode
= MCAST_INCLUDE
;
1556 #ifdef CONFIG_IP_MULTICAST
1557 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1558 IGMP_Unsolicited_Report_Count
;
1559 in_dev
->mr_ifc_count
= pmc
->crcount
;
1560 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1561 psf
->sf_crcount
= 0;
1562 igmp_ifc_event(pmc
->interface
);
1563 } else if (sf_setstate(pmc
) || changerec
) {
1564 igmp_ifc_event(pmc
->interface
);
1568 spin_unlock_bh(&pmc
->lock
);
1573 * Add multicast single-source filter to the interface list
1575 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1576 __be32
*psfsrc
, int delta
)
1578 struct ip_sf_list
*psf
, *psf_prev
;
1581 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1582 if (psf
->sf_inaddr
== *psfsrc
)
1587 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1590 psf
->sf_inaddr
= *psfsrc
;
1592 psf_prev
->sf_next
= psf
;
1596 psf
->sf_count
[sfmode
]++;
1597 if (psf
->sf_count
[sfmode
] == 1) {
1598 ip_rt_multicast_event(pmc
->interface
);
1603 #ifdef CONFIG_IP_MULTICAST
1604 static void sf_markstate(struct ip_mc_list
*pmc
)
1606 struct ip_sf_list
*psf
;
1607 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1609 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1610 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1611 psf
->sf_oldin
= mca_xcount
==
1612 psf
->sf_count
[MCAST_EXCLUDE
] &&
1613 !psf
->sf_count
[MCAST_INCLUDE
];
1615 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1618 static int sf_setstate(struct ip_mc_list
*pmc
)
1620 struct ip_sf_list
*psf
, *dpsf
;
1621 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1622 int qrv
= pmc
->interface
->mr_qrv
;
1626 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1627 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1628 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1629 !psf
->sf_count
[MCAST_INCLUDE
];
1631 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1633 if (!psf
->sf_oldin
) {
1634 struct ip_sf_list
*prev
= NULL
;
1636 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
) {
1637 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1643 prev
->sf_next
= dpsf
->sf_next
;
1645 pmc
->tomb
= dpsf
->sf_next
;
1648 psf
->sf_crcount
= qrv
;
1651 } else if (psf
->sf_oldin
) {
1653 psf
->sf_crcount
= 0;
1655 * add or update "delete" records if an active filter
1658 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
)
1659 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1662 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1666 /* pmc->lock held by callers */
1667 dpsf
->sf_next
= pmc
->tomb
;
1670 dpsf
->sf_crcount
= qrv
;
1679 * Add multicast source filter list to the interface list
1681 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1682 int sfcount
, __be32
*psfsrc
, int delta
)
1684 struct ip_mc_list
*pmc
;
1691 for_each_pmc_rcu(in_dev
, pmc
) {
1692 if (*pmca
== pmc
->multiaddr
)
1696 /* MCA not found?? bug */
1700 spin_lock_bh(&pmc
->lock
);
1703 #ifdef CONFIG_IP_MULTICAST
1706 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
1708 pmc
->sfcount
[sfmode
]++;
1710 for (i
=0; i
<sfcount
; i
++) {
1711 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
], delta
);
1718 pmc
->sfcount
[sfmode
]--;
1720 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1721 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
1722 #ifdef CONFIG_IP_MULTICAST
1723 struct ip_sf_list
*psf
;
1724 in_dev
= pmc
->interface
;
1727 /* filter mode change */
1728 if (pmc
->sfcount
[MCAST_EXCLUDE
])
1729 pmc
->sfmode
= MCAST_EXCLUDE
;
1730 else if (pmc
->sfcount
[MCAST_INCLUDE
])
1731 pmc
->sfmode
= MCAST_INCLUDE
;
1732 #ifdef CONFIG_IP_MULTICAST
1733 /* else no filters; keep old mode for reports */
1735 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1736 IGMP_Unsolicited_Report_Count
;
1737 in_dev
->mr_ifc_count
= pmc
->crcount
;
1738 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1739 psf
->sf_crcount
= 0;
1740 igmp_ifc_event(in_dev
);
1741 } else if (sf_setstate(pmc
)) {
1742 igmp_ifc_event(in_dev
);
1745 spin_unlock_bh(&pmc
->lock
);
1749 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
1751 struct ip_sf_list
*psf
, *nextpsf
;
1753 for (psf
=pmc
->tomb
; psf
; psf
=nextpsf
) {
1754 nextpsf
= psf
->sf_next
;
1758 for (psf
=pmc
->sources
; psf
; psf
=nextpsf
) {
1759 nextpsf
= psf
->sf_next
;
1762 pmc
->sources
= NULL
;
1763 pmc
->sfmode
= MCAST_EXCLUDE
;
1764 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
1765 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
1770 * Join a multicast group
1772 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1775 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
1776 struct ip_mc_socklist
*iml
= NULL
, *i
;
1777 struct in_device
*in_dev
;
1778 struct inet_sock
*inet
= inet_sk(sk
);
1779 struct net
*net
= sock_net(sk
);
1783 if (!ipv4_is_multicast(addr
))
1788 in_dev
= ip_mc_find_dev(net
, imr
);
1797 ifindex
= imr
->imr_ifindex
;
1798 for_each_pmc_rtnl(inet
, i
) {
1799 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
1800 i
->multi
.imr_ifindex
== ifindex
)
1805 if (count
>= sysctl_igmp_max_memberships
)
1807 iml
= sock_kmalloc(sk
, sizeof(*iml
), GFP_KERNEL
);
1811 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
1812 iml
->next_rcu
= inet
->mc_list
;
1814 iml
->sfmode
= MCAST_EXCLUDE
;
1815 rcu_assign_pointer(inet
->mc_list
, iml
);
1816 ip_mc_inc_group(in_dev
, addr
);
1822 EXPORT_SYMBOL(ip_mc_join_group
);
1824 static void ip_sf_socklist_reclaim(struct rcu_head
*rp
)
1826 kfree(container_of(rp
, struct ip_sf_socklist
, rcu
));
1827 /* sk_omem_alloc should have been decreased by the caller*/
1830 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
1831 struct in_device
*in_dev
)
1833 struct ip_sf_socklist
*psf
= rtnl_dereference(iml
->sflist
);
1837 /* any-source empty exclude case */
1838 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1839 iml
->sfmode
, 0, NULL
, 0);
1841 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1842 iml
->sfmode
, psf
->sl_count
, psf
->sl_addr
, 0);
1843 rcu_assign_pointer(iml
->sflist
, NULL
);
1844 /* decrease mem now to avoid the memleak warning */
1845 atomic_sub(IP_SFLSIZE(psf
->sl_max
), &sk
->sk_omem_alloc
);
1846 call_rcu(&psf
->rcu
, ip_sf_socklist_reclaim
);
1851 static void ip_mc_socklist_reclaim(struct rcu_head
*rp
)
1853 kfree(container_of(rp
, struct ip_mc_socklist
, rcu
));
1854 /* sk_omem_alloc should have been decreased by the caller*/
1859 * Ask a socket to leave a group.
1862 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1864 struct inet_sock
*inet
= inet_sk(sk
);
1865 struct ip_mc_socklist
*iml
;
1866 struct ip_mc_socklist __rcu
**imlp
;
1867 struct in_device
*in_dev
;
1868 struct net
*net
= sock_net(sk
);
1869 __be32 group
= imr
->imr_multiaddr
.s_addr
;
1871 int ret
= -EADDRNOTAVAIL
;
1874 in_dev
= ip_mc_find_dev(net
, imr
);
1875 ifindex
= imr
->imr_ifindex
;
1876 for (imlp
= &inet
->mc_list
;
1877 (iml
= rtnl_dereference(*imlp
)) != NULL
;
1878 imlp
= &iml
->next_rcu
) {
1879 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
1882 if (iml
->multi
.imr_ifindex
!= ifindex
)
1884 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
1885 iml
->multi
.imr_address
.s_addr
)
1888 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
1890 *imlp
= iml
->next_rcu
;
1893 ip_mc_dec_group(in_dev
, group
);
1895 /* decrease mem now to avoid the memleak warning */
1896 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
1897 call_rcu(&iml
->rcu
, ip_mc_socklist_reclaim
);
1906 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
1907 ip_mreq_source
*mreqs
, int ifindex
)
1910 struct ip_mreqn imr
;
1911 __be32 addr
= mreqs
->imr_multiaddr
;
1912 struct ip_mc_socklist
*pmc
;
1913 struct in_device
*in_dev
= NULL
;
1914 struct inet_sock
*inet
= inet_sk(sk
);
1915 struct ip_sf_socklist
*psl
;
1916 struct net
*net
= sock_net(sk
);
1920 if (!ipv4_is_multicast(addr
))
1925 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
1926 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
1927 imr
.imr_ifindex
= ifindex
;
1928 in_dev
= ip_mc_find_dev(net
, &imr
);
1934 err
= -EADDRNOTAVAIL
;
1936 for_each_pmc_rtnl(inet
, pmc
) {
1937 if ((pmc
->multi
.imr_multiaddr
.s_addr
==
1938 imr
.imr_multiaddr
.s_addr
) &&
1939 (pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
))
1942 if (!pmc
) { /* must have a prior join */
1946 /* if a source filter was set, must be the same mode as before */
1948 if (pmc
->sfmode
!= omode
) {
1952 } else if (pmc
->sfmode
!= omode
) {
1953 /* allow mode switches for empty-set filters */
1954 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
1955 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
1957 pmc
->sfmode
= omode
;
1960 psl
= rtnl_dereference(pmc
->sflist
);
1963 goto done
; /* err = -EADDRNOTAVAIL */
1965 for (i
=0; i
<psl
->sl_count
; i
++) {
1966 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
1971 if (rv
) /* source not found */
1972 goto done
; /* err = -EADDRNOTAVAIL */
1974 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1975 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
1980 /* update the interface filter */
1981 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
1982 &mreqs
->imr_sourceaddr
, 1);
1984 for (j
=i
+1; j
<psl
->sl_count
; j
++)
1985 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
1990 /* else, add a new source to the filter */
1992 if (psl
&& psl
->sl_count
>= sysctl_igmp_max_msf
) {
1996 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
1997 struct ip_sf_socklist
*newpsl
;
1998 int count
= IP_SFBLOCK
;
2001 count
+= psl
->sl_max
;
2002 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
2007 newpsl
->sl_max
= count
;
2008 newpsl
->sl_count
= count
- IP_SFBLOCK
;
2010 for (i
=0; i
<psl
->sl_count
; i
++)
2011 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
2012 /* decrease mem now to avoid the memleak warning */
2013 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2014 call_rcu(&psl
->rcu
, ip_sf_socklist_reclaim
);
2016 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2019 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
2020 for (i
=0; i
<psl
->sl_count
; i
++) {
2021 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2026 if (rv
== 0) /* address already there is an error */
2028 for (j
=psl
->sl_count
-1; j
>=i
; j
--)
2029 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
2030 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
2033 /* update the interface list */
2034 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2035 &mreqs
->imr_sourceaddr
, 1);
2039 return ip_mc_leave_group(sk
, &imr
);
2043 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
2046 struct ip_mreqn imr
;
2047 __be32 addr
= msf
->imsf_multiaddr
;
2048 struct ip_mc_socklist
*pmc
;
2049 struct in_device
*in_dev
;
2050 struct inet_sock
*inet
= inet_sk(sk
);
2051 struct ip_sf_socklist
*newpsl
, *psl
;
2052 struct net
*net
= sock_net(sk
);
2055 if (!ipv4_is_multicast(addr
))
2057 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2058 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2063 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2064 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2065 imr
.imr_ifindex
= ifindex
;
2066 in_dev
= ip_mc_find_dev(net
, &imr
);
2073 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2074 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2079 for_each_pmc_rtnl(inet
, pmc
) {
2080 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2081 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2084 if (!pmc
) { /* must have a prior join */
2088 if (msf
->imsf_numsrc
) {
2089 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2095 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2096 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2097 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2098 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2099 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2101 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2106 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2107 msf
->imsf_fmode
, 0, NULL
, 0);
2109 psl
= rtnl_dereference(pmc
->sflist
);
2111 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2112 psl
->sl_count
, psl
->sl_addr
, 0);
2113 /* decrease mem now to avoid the memleak warning */
2114 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2115 call_rcu(&psl
->rcu
, ip_sf_socklist_reclaim
);
2117 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2119 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2120 pmc
->sfmode
= msf
->imsf_fmode
;
2125 err
= ip_mc_leave_group(sk
, &imr
);
2129 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2130 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2132 int err
, len
, count
, copycount
;
2133 struct ip_mreqn imr
;
2134 __be32 addr
= msf
->imsf_multiaddr
;
2135 struct ip_mc_socklist
*pmc
;
2136 struct in_device
*in_dev
;
2137 struct inet_sock
*inet
= inet_sk(sk
);
2138 struct ip_sf_socklist
*psl
;
2139 struct net
*net
= sock_net(sk
);
2141 if (!ipv4_is_multicast(addr
))
2146 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2147 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2148 imr
.imr_ifindex
= 0;
2149 in_dev
= ip_mc_find_dev(net
, &imr
);
2155 err
= -EADDRNOTAVAIL
;
2157 for_each_pmc_rtnl(inet
, pmc
) {
2158 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2159 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2162 if (!pmc
) /* must have a prior join */
2164 msf
->imsf_fmode
= pmc
->sfmode
;
2165 psl
= rtnl_dereference(pmc
->sflist
);
2171 count
= psl
->sl_count
;
2173 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2174 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2175 msf
->imsf_numsrc
= count
;
2176 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2177 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2181 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2189 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2190 struct group_filter __user
*optval
, int __user
*optlen
)
2192 int err
, i
, count
, copycount
;
2193 struct sockaddr_in
*psin
;
2195 struct ip_mc_socklist
*pmc
;
2196 struct inet_sock
*inet
= inet_sk(sk
);
2197 struct ip_sf_socklist
*psl
;
2199 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2200 if (psin
->sin_family
!= AF_INET
)
2202 addr
= psin
->sin_addr
.s_addr
;
2203 if (!ipv4_is_multicast(addr
))
2208 err
= -EADDRNOTAVAIL
;
2210 for_each_pmc_rtnl(inet
, pmc
) {
2211 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2212 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2215 if (!pmc
) /* must have a prior join */
2217 gsf
->gf_fmode
= pmc
->sfmode
;
2218 psl
= rtnl_dereference(pmc
->sflist
);
2220 count
= psl
? psl
->sl_count
: 0;
2221 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2222 gsf
->gf_numsrc
= count
;
2223 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2224 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2227 for (i
=0; i
<copycount
; i
++) {
2228 struct sockaddr_storage ss
;
2230 psin
= (struct sockaddr_in
*)&ss
;
2231 memset(&ss
, 0, sizeof(ss
));
2232 psin
->sin_family
= AF_INET
;
2233 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2234 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2244 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2246 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2248 struct inet_sock
*inet
= inet_sk(sk
);
2249 struct ip_mc_socklist
*pmc
;
2250 struct ip_sf_socklist
*psl
;
2255 if (!ipv4_is_multicast(loc_addr
))
2259 for_each_pmc_rcu(inet
, pmc
) {
2260 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2261 pmc
->multi
.imr_ifindex
== dif
)
2267 psl
= rcu_dereference(pmc
->sflist
);
2268 ret
= (pmc
->sfmode
== MCAST_EXCLUDE
);
2272 for (i
=0; i
<psl
->sl_count
; i
++) {
2273 if (psl
->sl_addr
[i
] == rmt_addr
)
2277 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2279 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2289 * A socket is closing.
2292 void ip_mc_drop_socket(struct sock
*sk
)
2294 struct inet_sock
*inet
= inet_sk(sk
);
2295 struct ip_mc_socklist
*iml
;
2296 struct net
*net
= sock_net(sk
);
2298 if (inet
->mc_list
== NULL
)
2302 while ((iml
= rtnl_dereference(inet
->mc_list
)) != NULL
) {
2303 struct in_device
*in_dev
;
2305 inet
->mc_list
= iml
->next_rcu
;
2306 in_dev
= inetdev_by_index(net
, iml
->multi
.imr_ifindex
);
2307 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2309 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2310 /* decrease mem now to avoid the memleak warning */
2311 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2312 call_rcu(&iml
->rcu
, ip_mc_socklist_reclaim
);
2317 int ip_check_mc(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u16 proto
)
2319 struct ip_mc_list
*im
;
2320 struct ip_sf_list
*psf
;
2324 for_each_pmc_rcu(in_dev
, im
) {
2325 if (im
->multiaddr
== mc_addr
)
2328 if (im
&& proto
== IPPROTO_IGMP
) {
2332 for (psf
=im
->sources
; psf
; psf
=psf
->sf_next
) {
2333 if (psf
->sf_inaddr
== src_addr
)
2337 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2338 psf
->sf_count
[MCAST_EXCLUDE
] !=
2339 im
->sfcount
[MCAST_EXCLUDE
];
2341 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2343 rv
= 1; /* unspecified source; tentatively allow */
2349 #if defined(CONFIG_PROC_FS)
2350 struct igmp_mc_iter_state
{
2351 struct seq_net_private p
;
2352 struct net_device
*dev
;
2353 struct in_device
*in_dev
;
2356 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2358 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2360 struct net
*net
= seq_file_net(seq
);
2361 struct ip_mc_list
*im
= NULL
;
2362 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2364 state
->in_dev
= NULL
;
2365 for_each_netdev_rcu(net
, state
->dev
) {
2366 struct in_device
*in_dev
;
2368 in_dev
= __in_dev_get_rcu(state
->dev
);
2371 im
= rcu_dereference(in_dev
->mc_list
);
2373 state
->in_dev
= in_dev
;
2380 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2382 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2384 im
= rcu_dereference(im
->next_rcu
);
2386 state
->dev
= next_net_device_rcu(state
->dev
);
2388 state
->in_dev
= NULL
;
2391 state
->in_dev
= __in_dev_get_rcu(state
->dev
);
2394 im
= rcu_dereference(state
->in_dev
->mc_list
);
2399 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2401 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2403 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2405 return pos
? NULL
: im
;
2408 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2412 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2415 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2417 struct ip_mc_list
*im
;
2418 if (v
== SEQ_START_TOKEN
)
2419 im
= igmp_mc_get_first(seq
);
2421 im
= igmp_mc_get_next(seq
, v
);
2426 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2429 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2431 state
->in_dev
= NULL
;
2436 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2438 if (v
== SEQ_START_TOKEN
)
2440 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2442 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2443 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2445 #ifdef CONFIG_IP_MULTICAST
2446 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2447 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2453 if (rcu_dereference(state
->in_dev
->mc_list
) == im
) {
2454 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2455 state
->dev
->ifindex
, state
->dev
->name
, state
->in_dev
->mc_count
, querier
);
2459 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2460 im
->multiaddr
, im
->users
,
2461 im
->tm_running
, im
->tm_running
?
2462 jiffies_to_clock_t(im
->timer
.expires
-jiffies
) : 0,
2468 static const struct seq_operations igmp_mc_seq_ops
= {
2469 .start
= igmp_mc_seq_start
,
2470 .next
= igmp_mc_seq_next
,
2471 .stop
= igmp_mc_seq_stop
,
2472 .show
= igmp_mc_seq_show
,
2475 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2477 return seq_open_net(inode
, file
, &igmp_mc_seq_ops
,
2478 sizeof(struct igmp_mc_iter_state
));
2481 static const struct file_operations igmp_mc_seq_fops
= {
2482 .owner
= THIS_MODULE
,
2483 .open
= igmp_mc_seq_open
,
2485 .llseek
= seq_lseek
,
2486 .release
= seq_release_net
,
2489 struct igmp_mcf_iter_state
{
2490 struct seq_net_private p
;
2491 struct net_device
*dev
;
2492 struct in_device
*idev
;
2493 struct ip_mc_list
*im
;
2496 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2498 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2500 struct net
*net
= seq_file_net(seq
);
2501 struct ip_sf_list
*psf
= NULL
;
2502 struct ip_mc_list
*im
= NULL
;
2503 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2507 for_each_netdev_rcu(net
, state
->dev
) {
2508 struct in_device
*idev
;
2509 idev
= __in_dev_get_rcu(state
->dev
);
2510 if (unlikely(idev
== NULL
))
2512 im
= rcu_dereference(idev
->mc_list
);
2513 if (likely(im
!= NULL
)) {
2514 spin_lock_bh(&im
->lock
);
2516 if (likely(psf
!= NULL
)) {
2521 spin_unlock_bh(&im
->lock
);
2527 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2529 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2533 spin_unlock_bh(&state
->im
->lock
);
2534 state
->im
= state
->im
->next
;
2535 while (!state
->im
) {
2536 state
->dev
= next_net_device_rcu(state
->dev
);
2541 state
->idev
= __in_dev_get_rcu(state
->dev
);
2544 state
->im
= rcu_dereference(state
->idev
->mc_list
);
2548 spin_lock_bh(&state
->im
->lock
);
2549 psf
= state
->im
->sources
;
2555 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2557 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2559 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2561 return pos
? NULL
: psf
;
2564 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2568 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2571 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2573 struct ip_sf_list
*psf
;
2574 if (v
== SEQ_START_TOKEN
)
2575 psf
= igmp_mcf_get_first(seq
);
2577 psf
= igmp_mcf_get_next(seq
, v
);
2582 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2585 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2586 if (likely(state
->im
!= NULL
)) {
2587 spin_unlock_bh(&state
->im
->lock
);
2595 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2597 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2598 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2600 if (v
== SEQ_START_TOKEN
) {
2603 "%10s %10s %6s %6s\n", "Idx",
2605 "SRC", "INC", "EXC");
2609 "0x%08x %6lu %6lu\n",
2610 state
->dev
->ifindex
, state
->dev
->name
,
2611 ntohl(state
->im
->multiaddr
),
2612 ntohl(psf
->sf_inaddr
),
2613 psf
->sf_count
[MCAST_INCLUDE
],
2614 psf
->sf_count
[MCAST_EXCLUDE
]);
2619 static const struct seq_operations igmp_mcf_seq_ops
= {
2620 .start
= igmp_mcf_seq_start
,
2621 .next
= igmp_mcf_seq_next
,
2622 .stop
= igmp_mcf_seq_stop
,
2623 .show
= igmp_mcf_seq_show
,
2626 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2628 return seq_open_net(inode
, file
, &igmp_mcf_seq_ops
,
2629 sizeof(struct igmp_mcf_iter_state
));
2632 static const struct file_operations igmp_mcf_seq_fops
= {
2633 .owner
= THIS_MODULE
,
2634 .open
= igmp_mcf_seq_open
,
2636 .llseek
= seq_lseek
,
2637 .release
= seq_release_net
,
2640 static int __net_init
igmp_net_init(struct net
*net
)
2642 struct proc_dir_entry
*pde
;
2644 pde
= proc_net_fops_create(net
, "igmp", S_IRUGO
, &igmp_mc_seq_fops
);
2647 pde
= proc_net_fops_create(net
, "mcfilter", S_IRUGO
, &igmp_mcf_seq_fops
);
2653 proc_net_remove(net
, "igmp");
2658 static void __net_exit
igmp_net_exit(struct net
*net
)
2660 proc_net_remove(net
, "mcfilter");
2661 proc_net_remove(net
, "igmp");
2664 static struct pernet_operations igmp_net_ops
= {
2665 .init
= igmp_net_init
,
2666 .exit
= igmp_net_exit
,
2669 int __init
igmp_mc_proc_init(void)
2671 return register_pernet_subsys(&igmp_net_ops
);