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.
11 * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $
14 * Alan Cox <Alan.Cox@linux.org>
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License
18 * as published by the Free Software Foundation; either version
19 * 2 of the License, or (at your option) any later version.
23 * Alan Cox : Added lots of __inline__ to optimise
24 * the memory usage of all the tiny little
26 * Alan Cox : Dumped the header building experiment.
27 * Alan Cox : Minor tweaks ready for multicast routing
28 * and extended IGMP protocol.
29 * Alan Cox : Removed a load of inline directives. Gcc 2.5.8
30 * writes utterly bogus code otherwise (sigh)
31 * fixed IGMP loopback to behave in the manner
32 * desired by mrouted, fixed the fact it has been
33 * broken since 1.3.6 and cleaned up a few minor
36 * Chih-Jen Chang : Tried to revise IGMP to Version 2
37 * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu
38 * The enhancements are mainly based on Steve Deering's
39 * ipmulti-3.5 source code.
40 * Chih-Jen Chang : Added the igmp_get_mrouter_info and
41 * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of
42 * the mrouted version on that device.
43 * Chih-Jen Chang : Added the max_resp_time parameter to
44 * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter
45 * to identify the multicast router version
46 * and do what the IGMP version 2 specified.
47 * Chih-Jen Chang : Added a timer to revert to IGMP V2 router
48 * Tsu-Sheng Tsao if the specified time expired.
49 * Alan Cox : Stop IGMP from 0.0.0.0 being accepted.
50 * Alan Cox : Use GFP_ATOMIC in the right places.
51 * Christian Daudt : igmp timer wasn't set for local group
52 * memberships but was being deleted,
53 * which caused a "del_timer() called
54 * from %p with timer not initialized\n"
56 * Christian Daudt : removed del_timer from
57 * igmp_timer_expire function (960205).
58 * Christian Daudt : igmp_heard_report now only calls
59 * igmp_timer_expire if tm->running is
61 * Malcolm Beattie : ttl comparison wrong in igmp_rcv made
62 * igmp_heard_query never trigger. Expiry
63 * miscalculation fixed in igmp_heard_query
64 * and random() made to return unsigned to
65 * prevent negative expiry times.
66 * Alexey Kuznetsov: Wrong group leaving behaviour, backport
67 * fix from pending 2.1.x patches.
68 * Alan Cox: Forget to enable FDDI support earlier.
69 * Alexey Kuznetsov: Fixed leaving groups on device down.
70 * Alexey Kuznetsov: Accordance to igmp-v2-06 draft.
71 * David L Stevens: IGMPv3 support, with help from
75 #include <linux/module.h>
76 #include <asm/uaccess.h>
77 #include <asm/system.h>
78 #include <linux/types.h>
79 #include <linux/kernel.h>
80 #include <linux/jiffies.h>
81 #include <linux/string.h>
82 #include <linux/socket.h>
83 #include <linux/sockios.h>
85 #include <linux/inet.h>
86 #include <linux/netdevice.h>
87 #include <linux/skbuff.h>
88 #include <linux/inetdevice.h>
89 #include <linux/igmp.h>
90 #include <linux/if_arp.h>
91 #include <linux/rtnetlink.h>
92 #include <linux/times.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) (ipv4_devconf.force_igmp_version == 1 || \
132 (in_dev)->cnf.force_igmp_version == 1 || \
133 ((in_dev)->mr_v1_seen && \
134 time_before(jiffies, (in_dev)->mr_v1_seen)))
135 #define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \
136 (in_dev)->cnf.force_igmp_version == 2 || \
137 ((in_dev)->mr_v2_seen && \
138 time_before(jiffies, (in_dev)->mr_v2_seen)))
140 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
);
141 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
);
142 static void igmpv3_clear_delrec(struct in_device
*in_dev
);
143 static int sf_setstate(struct ip_mc_list
*pmc
);
144 static void sf_markstate(struct ip_mc_list
*pmc
);
146 static void ip_mc_clear_src(struct ip_mc_list
*pmc
);
147 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
148 int sfcount
, __be32
*psfsrc
, int delta
);
150 static void ip_ma_put(struct ip_mc_list
*im
)
152 if (atomic_dec_and_test(&im
->refcnt
)) {
153 in_dev_put(im
->interface
);
158 #ifdef CONFIG_IP_MULTICAST
164 static __inline__
void igmp_stop_timer(struct ip_mc_list
*im
)
166 spin_lock_bh(&im
->lock
);
167 if (del_timer(&im
->timer
))
168 atomic_dec(&im
->refcnt
);
171 im
->unsolicit_count
= 0;
172 spin_unlock_bh(&im
->lock
);
175 /* It must be called with locked im->lock */
176 static void igmp_start_timer(struct ip_mc_list
*im
, int max_delay
)
178 int tv
=net_random() % max_delay
;
181 if (!mod_timer(&im
->timer
, jiffies
+tv
+2))
182 atomic_inc(&im
->refcnt
);
185 static void igmp_gq_start_timer(struct in_device
*in_dev
)
187 int tv
= net_random() % in_dev
->mr_maxdelay
;
189 in_dev
->mr_gq_running
= 1;
190 if (!mod_timer(&in_dev
->mr_gq_timer
, jiffies
+tv
+2))
194 static void igmp_ifc_start_timer(struct in_device
*in_dev
, int delay
)
196 int tv
= net_random() % delay
;
198 if (!mod_timer(&in_dev
->mr_ifc_timer
, jiffies
+tv
+2))
202 static void igmp_mod_timer(struct ip_mc_list
*im
, int max_delay
)
204 spin_lock_bh(&im
->lock
);
205 im
->unsolicit_count
= 0;
206 if (del_timer(&im
->timer
)) {
207 if ((long)(im
->timer
.expires
-jiffies
) < max_delay
) {
208 add_timer(&im
->timer
);
210 spin_unlock_bh(&im
->lock
);
213 atomic_dec(&im
->refcnt
);
215 igmp_start_timer(im
, max_delay
);
216 spin_unlock_bh(&im
->lock
);
221 * Send an IGMP report.
224 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
227 static int is_in(struct ip_mc_list
*pmc
, struct ip_sf_list
*psf
, int type
,
228 int gdeleted
, int sdeleted
)
231 case IGMPV3_MODE_IS_INCLUDE
:
232 case IGMPV3_MODE_IS_EXCLUDE
:
233 if (gdeleted
|| sdeleted
)
235 if (!(pmc
->gsquery
&& !psf
->sf_gsresp
)) {
236 if (pmc
->sfmode
== MCAST_INCLUDE
)
238 /* don't include if this source is excluded
241 if (psf
->sf_count
[MCAST_INCLUDE
])
242 return type
== IGMPV3_MODE_IS_INCLUDE
;
243 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
244 psf
->sf_count
[MCAST_EXCLUDE
];
247 case IGMPV3_CHANGE_TO_INCLUDE
:
248 if (gdeleted
|| sdeleted
)
250 return psf
->sf_count
[MCAST_INCLUDE
] != 0;
251 case IGMPV3_CHANGE_TO_EXCLUDE
:
252 if (gdeleted
|| sdeleted
)
254 if (pmc
->sfcount
[MCAST_EXCLUDE
] == 0 ||
255 psf
->sf_count
[MCAST_INCLUDE
])
257 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
258 psf
->sf_count
[MCAST_EXCLUDE
];
259 case IGMPV3_ALLOW_NEW_SOURCES
:
260 if (gdeleted
|| !psf
->sf_crcount
)
262 return (pmc
->sfmode
== MCAST_INCLUDE
) ^ sdeleted
;
263 case IGMPV3_BLOCK_OLD_SOURCES
:
264 if (pmc
->sfmode
== MCAST_INCLUDE
)
265 return gdeleted
|| (psf
->sf_crcount
&& sdeleted
);
266 return psf
->sf_crcount
&& !gdeleted
&& !sdeleted
;
272 igmp_scount(struct ip_mc_list
*pmc
, int type
, int gdeleted
, int sdeleted
)
274 struct ip_sf_list
*psf
;
277 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
278 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
))
285 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, int size
)
290 struct igmpv3_report
*pig
;
292 skb
= alloc_skb(size
+ LL_RESERVED_SPACE(dev
), GFP_ATOMIC
);
297 struct flowi fl
= { .oif
= dev
->ifindex
,
299 .daddr
= IGMPV3_ALL_MCR
} },
300 .proto
= IPPROTO_IGMP
};
301 if (ip_route_output_key(&rt
, &fl
)) {
306 if (rt
->rt_src
== 0) {
312 skb
->dst
= &rt
->u
.dst
;
315 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
317 skb_reset_network_header(skb
);
319 skb_put(skb
, sizeof(struct iphdr
) + 4);
322 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
324 pip
->frag_off
= htons(IP_DF
);
326 pip
->daddr
= rt
->rt_dst
;
327 pip
->saddr
= rt
->rt_src
;
328 pip
->protocol
= IPPROTO_IGMP
;
329 pip
->tot_len
= 0; /* filled in later */
330 ip_select_ident(pip
, &rt
->u
.dst
, NULL
);
331 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
332 ((u8
*)&pip
[1])[1] = 4;
333 ((u8
*)&pip
[1])[2] = 0;
334 ((u8
*)&pip
[1])[3] = 0;
336 pig
=(struct igmpv3_report
*)skb_put(skb
, sizeof(*pig
));
337 skb
->h
.igmph
= (struct igmphdr
*)pig
;
338 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
346 static int igmpv3_sendpack(struct sk_buff
*skb
)
348 struct iphdr
*pip
= skb
->nh
.iph
;
349 struct igmphdr
*pig
= skb
->h
.igmph
;
352 iplen
= skb
->tail
- (unsigned char *)skb
->nh
.iph
;
353 pip
->tot_len
= htons(iplen
);
356 igmplen
= skb
->tail
- (unsigned char *)skb
->h
.igmph
;
357 pig
->csum
= ip_compute_csum((void *)skb
->h
.igmph
, igmplen
);
359 return NF_HOOK(PF_INET
, NF_IP_LOCAL_OUT
, skb
, NULL
, skb
->dev
,
363 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
365 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
,type
,gdel
,sdel
);
368 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
369 int type
, struct igmpv3_grec
**ppgr
)
371 struct net_device
*dev
= pmc
->interface
->dev
;
372 struct igmpv3_report
*pih
;
373 struct igmpv3_grec
*pgr
;
376 skb
= igmpv3_newpack(dev
, dev
->mtu
);
379 pgr
= (struct igmpv3_grec
*)skb_put(skb
, sizeof(struct igmpv3_grec
));
380 pgr
->grec_type
= type
;
381 pgr
->grec_auxwords
= 0;
383 pgr
->grec_mca
= pmc
->multiaddr
;
384 pih
= (struct igmpv3_report
*)skb
->h
.igmph
;
385 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
390 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \
391 skb_tailroom(skb)) : 0)
393 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
394 int type
, int gdeleted
, int sdeleted
)
396 struct net_device
*dev
= pmc
->interface
->dev
;
397 struct igmpv3_report
*pih
;
398 struct igmpv3_grec
*pgr
= NULL
;
399 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
400 int scount
, stotal
, first
, isquery
, truncate
;
402 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
405 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
406 type
== IGMPV3_MODE_IS_EXCLUDE
;
407 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
408 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
412 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
417 pih
= skb
? (struct igmpv3_report
*)skb
->h
.igmph
: NULL
;
419 /* EX and TO_EX get a fresh packet, if needed */
421 if (pih
&& pih
->ngrec
&&
422 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
424 igmpv3_sendpack(skb
);
425 skb
= igmpv3_newpack(dev
, dev
->mtu
);
430 for (psf
=*psf_list
; psf
; psf
=psf_next
) {
433 psf_next
= psf
->sf_next
;
435 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
440 /* clear marks on query responses */
444 if (AVAILABLE(skb
) < sizeof(__be32
) +
445 first
*sizeof(struct igmpv3_grec
)) {
446 if (truncate
&& !first
)
447 break; /* truncate these */
449 pgr
->grec_nsrcs
= htons(scount
);
451 igmpv3_sendpack(skb
);
452 skb
= igmpv3_newpack(dev
, dev
->mtu
);
457 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
462 psrc
= (__be32
*)skb_put(skb
, sizeof(__be32
));
463 *psrc
= psf
->sf_inaddr
;
465 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
466 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
468 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
470 psf_prev
->sf_next
= psf
->sf_next
;
472 *psf_list
= psf
->sf_next
;
482 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
483 type
== IGMPV3_BLOCK_OLD_SOURCES
)
485 if (pmc
->crcount
|| isquery
) {
486 /* make sure we have room for group header */
487 if (skb
&& AVAILABLE(skb
)<sizeof(struct igmpv3_grec
)) {
488 igmpv3_sendpack(skb
);
489 skb
= NULL
; /* add_grhead will get a new one */
491 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
495 pgr
->grec_nsrcs
= htons(scount
);
498 pmc
->gsquery
= 0; /* clear query state on report */
502 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
504 struct sk_buff
*skb
= NULL
;
508 read_lock(&in_dev
->mc_list_lock
);
509 for (pmc
=in_dev
->mc_list
; pmc
; pmc
=pmc
->next
) {
510 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
512 spin_lock_bh(&pmc
->lock
);
513 if (pmc
->sfcount
[MCAST_EXCLUDE
])
514 type
= IGMPV3_MODE_IS_EXCLUDE
;
516 type
= IGMPV3_MODE_IS_INCLUDE
;
517 skb
= add_grec(skb
, pmc
, type
, 0, 0);
518 spin_unlock_bh(&pmc
->lock
);
520 read_unlock(&in_dev
->mc_list_lock
);
522 spin_lock_bh(&pmc
->lock
);
523 if (pmc
->sfcount
[MCAST_EXCLUDE
])
524 type
= IGMPV3_MODE_IS_EXCLUDE
;
526 type
= IGMPV3_MODE_IS_INCLUDE
;
527 skb
= add_grec(skb
, pmc
, type
, 0, 0);
528 spin_unlock_bh(&pmc
->lock
);
532 return igmpv3_sendpack(skb
);
536 * remove zero-count source records from a source filter list
538 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
540 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
543 for (psf
=*ppsf
; psf
; psf
= psf_next
) {
544 psf_next
= psf
->sf_next
;
545 if (psf
->sf_crcount
== 0) {
547 psf_prev
->sf_next
= psf
->sf_next
;
549 *ppsf
= psf
->sf_next
;
556 static void igmpv3_send_cr(struct in_device
*in_dev
)
558 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
559 struct sk_buff
*skb
= NULL
;
562 read_lock(&in_dev
->mc_list_lock
);
563 spin_lock_bh(&in_dev
->mc_tomb_lock
);
567 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc_next
) {
568 pmc_next
= pmc
->next
;
569 if (pmc
->sfmode
== MCAST_INCLUDE
) {
570 type
= IGMPV3_BLOCK_OLD_SOURCES
;
571 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
572 skb
= add_grec(skb
, pmc
, type
, 1, 0);
573 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
576 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
577 type
= IGMPV3_CHANGE_TO_INCLUDE
;
578 skb
= add_grec(skb
, pmc
, type
, 1, 0);
581 if (pmc
->crcount
== 0) {
582 igmpv3_clear_zeros(&pmc
->tomb
);
583 igmpv3_clear_zeros(&pmc
->sources
);
586 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
588 pmc_prev
->next
= pmc_next
;
590 in_dev
->mc_tomb
= pmc_next
;
591 in_dev_put(pmc
->interface
);
596 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
599 for (pmc
=in_dev
->mc_list
; pmc
; pmc
=pmc
->next
) {
600 spin_lock_bh(&pmc
->lock
);
601 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
602 type
= IGMPV3_BLOCK_OLD_SOURCES
;
603 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
605 type
= IGMPV3_ALLOW_NEW_SOURCES
;
606 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
608 skb
= add_grec(skb
, pmc
, type
, 0, 0);
609 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
611 /* filter mode changes */
613 if (pmc
->sfmode
== MCAST_EXCLUDE
)
614 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
616 type
= IGMPV3_CHANGE_TO_INCLUDE
;
617 skb
= add_grec(skb
, pmc
, type
, 0, 0);
620 spin_unlock_bh(&pmc
->lock
);
622 read_unlock(&in_dev
->mc_list_lock
);
626 (void) igmpv3_sendpack(skb
);
629 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
636 struct net_device
*dev
= in_dev
->dev
;
637 __be32 group
= pmc
? pmc
->multiaddr
: 0;
640 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
641 return igmpv3_send_report(in_dev
, pmc
);
642 else if (type
== IGMP_HOST_LEAVE_MESSAGE
)
643 dst
= IGMP_ALL_ROUTER
;
648 struct flowi fl
= { .oif
= dev
->ifindex
,
649 .nl_u
= { .ip4_u
= { .daddr
= dst
} },
650 .proto
= IPPROTO_IGMP
};
651 if (ip_route_output_key(&rt
, &fl
))
654 if (rt
->rt_src
== 0) {
659 skb
=alloc_skb(IGMP_SIZE
+LL_RESERVED_SPACE(dev
), GFP_ATOMIC
);
665 skb
->dst
= &rt
->u
.dst
;
667 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
669 skb_reset_network_header(skb
);
671 skb_put(skb
, sizeof(struct iphdr
) + 4);
674 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
676 iph
->frag_off
= htons(IP_DF
);
679 iph
->saddr
= rt
->rt_src
;
680 iph
->protocol
= IPPROTO_IGMP
;
681 iph
->tot_len
= htons(IGMP_SIZE
);
682 ip_select_ident(iph
, &rt
->u
.dst
, NULL
);
683 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
684 ((u8
*)&iph
[1])[1] = 4;
685 ((u8
*)&iph
[1])[2] = 0;
686 ((u8
*)&iph
[1])[3] = 0;
689 ih
= (struct igmphdr
*)skb_put(skb
, sizeof(struct igmphdr
));
694 ih
->csum
=ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
696 return NF_HOOK(PF_INET
, NF_IP_LOCAL_OUT
, skb
, NULL
, rt
->u
.dst
.dev
,
700 static void igmp_gq_timer_expire(unsigned long data
)
702 struct in_device
*in_dev
= (struct in_device
*)data
;
704 in_dev
->mr_gq_running
= 0;
705 igmpv3_send_report(in_dev
, NULL
);
706 __in_dev_put(in_dev
);
709 static void igmp_ifc_timer_expire(unsigned long data
)
711 struct in_device
*in_dev
= (struct in_device
*)data
;
713 igmpv3_send_cr(in_dev
);
714 if (in_dev
->mr_ifc_count
) {
715 in_dev
->mr_ifc_count
--;
716 igmp_ifc_start_timer(in_dev
, IGMP_Unsolicited_Report_Interval
);
718 __in_dev_put(in_dev
);
721 static void igmp_ifc_event(struct in_device
*in_dev
)
723 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
725 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
726 IGMP_Unsolicited_Report_Count
;
727 igmp_ifc_start_timer(in_dev
, 1);
731 static void igmp_timer_expire(unsigned long data
)
733 struct ip_mc_list
*im
=(struct ip_mc_list
*)data
;
734 struct in_device
*in_dev
= im
->interface
;
736 spin_lock(&im
->lock
);
739 if (im
->unsolicit_count
) {
740 im
->unsolicit_count
--;
741 igmp_start_timer(im
, IGMP_Unsolicited_Report_Interval
);
744 spin_unlock(&im
->lock
);
746 if (IGMP_V1_SEEN(in_dev
))
747 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
748 else if (IGMP_V2_SEEN(in_dev
))
749 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
751 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
756 /* mark EXCLUDE-mode sources */
757 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
759 struct ip_sf_list
*psf
;
763 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
766 for (i
=0; i
<nsrcs
; i
++) {
767 /* skip inactive filters */
768 if (pmc
->sfcount
[MCAST_INCLUDE
] ||
769 pmc
->sfcount
[MCAST_EXCLUDE
] !=
770 psf
->sf_count
[MCAST_EXCLUDE
])
772 if (srcs
[i
] == psf
->sf_inaddr
) {
779 if (scount
== nsrcs
) /* all sources excluded */
784 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
786 struct ip_sf_list
*psf
;
789 if (pmc
->sfmode
== MCAST_EXCLUDE
)
790 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
792 /* mark INCLUDE-mode sources */
794 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
797 for (i
=0; i
<nsrcs
; i
++)
798 if (srcs
[i
] == psf
->sf_inaddr
) {
812 static void igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
814 struct ip_mc_list
*im
;
816 /* Timers are only set for non-local groups */
818 if (group
== IGMP_ALL_HOSTS
)
821 read_lock(&in_dev
->mc_list_lock
);
822 for (im
=in_dev
->mc_list
; im
!=NULL
; im
=im
->next
) {
823 if (im
->multiaddr
== group
) {
828 read_unlock(&in_dev
->mc_list_lock
);
831 static void igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
834 struct igmphdr
*ih
= skb
->h
.igmph
;
835 struct igmpv3_query
*ih3
= (struct igmpv3_query
*)ih
;
836 struct ip_mc_list
*im
;
837 __be32 group
= ih
->group
;
844 /* Alas, old v1 router presents here. */
846 max_delay
= IGMP_Query_Response_Interval
;
847 in_dev
->mr_v1_seen
= jiffies
+
848 IGMP_V1_Router_Present_Timeout
;
851 /* v2 router present */
852 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
853 in_dev
->mr_v2_seen
= jiffies
+
854 IGMP_V2_Router_Present_Timeout
;
856 /* cancel the interface change timer */
857 in_dev
->mr_ifc_count
= 0;
858 if (del_timer(&in_dev
->mr_ifc_timer
))
859 __in_dev_put(in_dev
);
860 /* clear deleted report items */
861 igmpv3_clear_delrec(in_dev
);
862 } else if (len
< 12) {
863 return; /* ignore bogus packet; freed by caller */
865 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
868 ih3
= (struct igmpv3_query
*) skb
->h
.raw
;
870 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
871 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
873 ih3
= (struct igmpv3_query
*) skb
->h
.raw
;
876 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
878 max_delay
= 1; /* can't mod w/ 0 */
879 in_dev
->mr_maxdelay
= max_delay
;
881 in_dev
->mr_qrv
= ih3
->qrv
;
882 if (!group
) { /* general query */
884 return; /* no sources allowed */
885 igmp_gq_start_timer(in_dev
);
888 /* mark sources to include, if group & source-specific */
889 mark
= ih3
->nsrcs
!= 0;
893 * - Start the timers in all of our membership records
894 * that the query applies to for the interface on
895 * which the query arrived excl. those that belong
896 * to a "local" group (224.0.0.X)
897 * - For timers already running check if they need to
899 * - Use the igmp->igmp_code field as the maximum
902 read_lock(&in_dev
->mc_list_lock
);
903 for (im
=in_dev
->mc_list
; im
!=NULL
; im
=im
->next
) {
906 if (group
&& group
!= im
->multiaddr
)
908 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
910 spin_lock_bh(&im
->lock
);
912 im
->gsquery
= im
->gsquery
&& mark
;
915 changed
= !im
->gsquery
||
916 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
917 spin_unlock_bh(&im
->lock
);
919 igmp_mod_timer(im
, max_delay
);
921 read_unlock(&in_dev
->mc_list_lock
);
924 int igmp_rcv(struct sk_buff
*skb
)
926 /* This basically follows the spec line by line -- see RFC1112 */
928 struct in_device
*in_dev
= in_dev_get(skb
->dev
);
936 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
939 switch (skb
->ip_summed
) {
940 case CHECKSUM_COMPLETE
:
941 if (!csum_fold(skb
->csum
))
946 if (__skb_checksum_complete(skb
))
952 case IGMP_HOST_MEMBERSHIP_QUERY
:
953 igmp_heard_query(in_dev
, skb
, len
);
955 case IGMP_HOST_MEMBERSHIP_REPORT
:
956 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
957 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
958 /* Is it our report looped back? */
959 if (((struct rtable
*)skb
->dst
)->fl
.iif
== 0)
961 /* don't rely on MC router hearing unicast reports */
962 if (skb
->pkt_type
== PACKET_MULTICAST
||
963 skb
->pkt_type
== PACKET_BROADCAST
)
964 igmp_heard_report(in_dev
, ih
->group
);
967 #ifdef CONFIG_IP_PIMSM_V1
969 return pim_rcv_v1(skb
);
973 case IGMP_HOST_LEAVE_MESSAGE
:
975 case IGMP_MTRACE_RESP
:
991 * Add a filter to a device
994 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
996 char buf
[MAX_ADDR_LEN
];
997 struct net_device
*dev
= in_dev
->dev
;
999 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1000 We will get multicast token leakage, when IFF_MULTICAST
1001 is changed. This check should be done in dev->set_multicast_list
1002 routine. Something sort of:
1003 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1006 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1007 dev_mc_add(dev
,buf
,dev
->addr_len
,0);
1011 * Remove a filter from a device
1014 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1016 char buf
[MAX_ADDR_LEN
];
1017 struct net_device
*dev
= in_dev
->dev
;
1019 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1020 dev_mc_delete(dev
,buf
,dev
->addr_len
,0);
1023 #ifdef CONFIG_IP_MULTICAST
1025 * deleted ip_mc_list manipulation
1027 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1029 struct ip_mc_list
*pmc
;
1031 /* this is an "ip_mc_list" for convenience; only the fields below
1032 * are actually used. In particular, the refcnt and users are not
1033 * used for management of the delete list. Using the same structure
1034 * for deleted items allows change reports to use common code with
1035 * non-deleted or query-response MCA's.
1037 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1040 spin_lock_bh(&im
->lock
);
1041 pmc
->interface
= im
->interface
;
1042 in_dev_hold(in_dev
);
1043 pmc
->multiaddr
= im
->multiaddr
;
1044 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1045 IGMP_Unsolicited_Report_Count
;
1046 pmc
->sfmode
= im
->sfmode
;
1047 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1048 struct ip_sf_list
*psf
;
1050 pmc
->tomb
= im
->tomb
;
1051 pmc
->sources
= im
->sources
;
1052 im
->tomb
= im
->sources
= NULL
;
1053 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1054 psf
->sf_crcount
= pmc
->crcount
;
1056 spin_unlock_bh(&im
->lock
);
1058 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1059 pmc
->next
= in_dev
->mc_tomb
;
1060 in_dev
->mc_tomb
= pmc
;
1061 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1064 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
)
1066 struct ip_mc_list
*pmc
, *pmc_prev
;
1067 struct ip_sf_list
*psf
, *psf_next
;
1069 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1071 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc
->next
) {
1072 if (pmc
->multiaddr
== multiaddr
)
1078 pmc_prev
->next
= pmc
->next
;
1080 in_dev
->mc_tomb
= pmc
->next
;
1082 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1084 for (psf
=pmc
->tomb
; psf
; psf
=psf_next
) {
1085 psf_next
= psf
->sf_next
;
1088 in_dev_put(pmc
->interface
);
1093 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1095 struct ip_mc_list
*pmc
, *nextpmc
;
1097 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1098 pmc
= in_dev
->mc_tomb
;
1099 in_dev
->mc_tomb
= NULL
;
1100 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1102 for (; pmc
; pmc
= nextpmc
) {
1103 nextpmc
= pmc
->next
;
1104 ip_mc_clear_src(pmc
);
1105 in_dev_put(pmc
->interface
);
1108 /* clear dead sources, too */
1109 read_lock(&in_dev
->mc_list_lock
);
1110 for (pmc
=in_dev
->mc_list
; pmc
; pmc
=pmc
->next
) {
1111 struct ip_sf_list
*psf
, *psf_next
;
1113 spin_lock_bh(&pmc
->lock
);
1116 spin_unlock_bh(&pmc
->lock
);
1117 for (; psf
; psf
=psf_next
) {
1118 psf_next
= psf
->sf_next
;
1122 read_unlock(&in_dev
->mc_list_lock
);
1126 static void igmp_group_dropped(struct ip_mc_list
*im
)
1128 struct in_device
*in_dev
= im
->interface
;
1129 #ifdef CONFIG_IP_MULTICAST
1135 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1138 #ifdef CONFIG_IP_MULTICAST
1139 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1142 reporter
= im
->reporter
;
1143 igmp_stop_timer(im
);
1145 if (!in_dev
->dead
) {
1146 if (IGMP_V1_SEEN(in_dev
))
1148 if (IGMP_V2_SEEN(in_dev
)) {
1150 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1154 igmpv3_add_delrec(in_dev
, im
);
1156 igmp_ifc_event(in_dev
);
1160 ip_mc_clear_src(im
);
1163 static void igmp_group_added(struct ip_mc_list
*im
)
1165 struct in_device
*in_dev
= im
->interface
;
1167 if (im
->loaded
== 0) {
1169 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1172 #ifdef CONFIG_IP_MULTICAST
1173 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1178 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1179 spin_lock_bh(&im
->lock
);
1180 igmp_start_timer(im
, IGMP_Initial_Report_Delay
);
1181 spin_unlock_bh(&im
->lock
);
1186 im
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1187 IGMP_Unsolicited_Report_Count
;
1188 igmp_ifc_event(in_dev
);
1194 * Multicast list managers
1199 * A socket has joined a multicast group on device dev.
1202 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1204 struct ip_mc_list
*im
;
1208 for (im
=in_dev
->mc_list
; im
; im
=im
->next
) {
1209 if (im
->multiaddr
== addr
) {
1211 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1216 im
= kmalloc(sizeof(*im
), GFP_KERNEL
);
1221 im
->interface
=in_dev
;
1222 in_dev_hold(in_dev
);
1224 /* initial mode is (EX, empty) */
1225 im
->sfmode
= MCAST_EXCLUDE
;
1226 im
->sfcount
[MCAST_INCLUDE
] = 0;
1227 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1231 atomic_set(&im
->refcnt
, 1);
1232 spin_lock_init(&im
->lock
);
1233 #ifdef CONFIG_IP_MULTICAST
1235 init_timer(&im
->timer
);
1236 im
->timer
.data
=(unsigned long)im
;
1237 im
->timer
.function
=&igmp_timer_expire
;
1238 im
->unsolicit_count
= IGMP_Unsolicited_Report_Count
;
1243 write_lock_bh(&in_dev
->mc_list_lock
);
1244 im
->next
=in_dev
->mc_list
;
1246 write_unlock_bh(&in_dev
->mc_list_lock
);
1247 #ifdef CONFIG_IP_MULTICAST
1248 igmpv3_del_delrec(in_dev
, im
->multiaddr
);
1250 igmp_group_added(im
);
1252 ip_rt_multicast_event(in_dev
);
1258 * Resend IGMP JOIN report; used for bonding.
1260 void ip_mc_rejoin_group(struct ip_mc_list
*im
)
1262 #ifdef CONFIG_IP_MULTICAST
1263 struct in_device
*in_dev
= im
->interface
;
1265 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1268 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1269 igmp_mod_timer(im
, IGMP_Initial_Report_Delay
);
1273 im
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1274 IGMP_Unsolicited_Report_Count
;
1275 igmp_ifc_event(in_dev
);
1280 * A socket has left a multicast group on device dev
1283 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1285 struct ip_mc_list
*i
, **ip
;
1289 for (ip
=&in_dev
->mc_list
; (i
=*ip
)!=NULL
; ip
=&i
->next
) {
1290 if (i
->multiaddr
==addr
) {
1291 if (--i
->users
== 0) {
1292 write_lock_bh(&in_dev
->mc_list_lock
);
1294 write_unlock_bh(&in_dev
->mc_list_lock
);
1295 igmp_group_dropped(i
);
1298 ip_rt_multicast_event(in_dev
);
1308 /* Device going down */
1310 void ip_mc_down(struct in_device
*in_dev
)
1312 struct ip_mc_list
*i
;
1316 for (i
=in_dev
->mc_list
; i
; i
=i
->next
)
1317 igmp_group_dropped(i
);
1319 #ifdef CONFIG_IP_MULTICAST
1320 in_dev
->mr_ifc_count
= 0;
1321 if (del_timer(&in_dev
->mr_ifc_timer
))
1322 __in_dev_put(in_dev
);
1323 in_dev
->mr_gq_running
= 0;
1324 if (del_timer(&in_dev
->mr_gq_timer
))
1325 __in_dev_put(in_dev
);
1326 igmpv3_clear_delrec(in_dev
);
1329 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1332 void ip_mc_init_dev(struct in_device
*in_dev
)
1336 in_dev
->mc_tomb
= NULL
;
1337 #ifdef CONFIG_IP_MULTICAST
1338 in_dev
->mr_gq_running
= 0;
1339 init_timer(&in_dev
->mr_gq_timer
);
1340 in_dev
->mr_gq_timer
.data
=(unsigned long) in_dev
;
1341 in_dev
->mr_gq_timer
.function
=&igmp_gq_timer_expire
;
1342 in_dev
->mr_ifc_count
= 0;
1343 init_timer(&in_dev
->mr_ifc_timer
);
1344 in_dev
->mr_ifc_timer
.data
=(unsigned long) in_dev
;
1345 in_dev
->mr_ifc_timer
.function
=&igmp_ifc_timer_expire
;
1346 in_dev
->mr_qrv
= IGMP_Unsolicited_Report_Count
;
1349 rwlock_init(&in_dev
->mc_list_lock
);
1350 spin_lock_init(&in_dev
->mc_tomb_lock
);
1353 /* Device going up */
1355 void ip_mc_up(struct in_device
*in_dev
)
1357 struct ip_mc_list
*i
;
1361 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1363 for (i
=in_dev
->mc_list
; i
; i
=i
->next
)
1364 igmp_group_added(i
);
1368 * Device is about to be destroyed: clean up.
1371 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1373 struct ip_mc_list
*i
;
1377 /* Deactivate timers */
1380 write_lock_bh(&in_dev
->mc_list_lock
);
1381 while ((i
= in_dev
->mc_list
) != NULL
) {
1382 in_dev
->mc_list
= i
->next
;
1383 write_unlock_bh(&in_dev
->mc_list_lock
);
1385 igmp_group_dropped(i
);
1388 write_lock_bh(&in_dev
->mc_list_lock
);
1390 write_unlock_bh(&in_dev
->mc_list_lock
);
1393 static struct in_device
* ip_mc_find_dev(struct ip_mreqn
*imr
)
1395 struct flowi fl
= { .nl_u
= { .ip4_u
=
1396 { .daddr
= imr
->imr_multiaddr
.s_addr
} } };
1398 struct net_device
*dev
= NULL
;
1399 struct in_device
*idev
= NULL
;
1401 if (imr
->imr_ifindex
) {
1402 idev
= inetdev_by_index(imr
->imr_ifindex
);
1407 if (imr
->imr_address
.s_addr
) {
1408 dev
= ip_dev_find(imr
->imr_address
.s_addr
);
1414 if (!dev
&& !ip_route_output_key(&rt
, &fl
)) {
1415 dev
= rt
->u
.dst
.dev
;
1419 imr
->imr_ifindex
= dev
->ifindex
;
1420 idev
= __in_dev_get_rtnl(dev
);
1426 * Join a socket to a group
1428 int sysctl_igmp_max_memberships __read_mostly
= IP_MAX_MEMBERSHIPS
;
1429 int sysctl_igmp_max_msf __read_mostly
= IP_MAX_MSF
;
1432 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1435 struct ip_sf_list
*psf
, *psf_prev
;
1439 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1440 if (psf
->sf_inaddr
== *psfsrc
)
1444 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1445 /* source filter not found, or count wrong => bug */
1448 psf
->sf_count
[sfmode
]--;
1449 if (psf
->sf_count
[sfmode
] == 0) {
1450 ip_rt_multicast_event(pmc
->interface
);
1452 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1453 #ifdef CONFIG_IP_MULTICAST
1454 struct in_device
*in_dev
= pmc
->interface
;
1457 /* no more filters for this source */
1459 psf_prev
->sf_next
= psf
->sf_next
;
1461 pmc
->sources
= psf
->sf_next
;
1462 #ifdef CONFIG_IP_MULTICAST
1463 if (psf
->sf_oldin
&&
1464 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1465 psf
->sf_crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1466 IGMP_Unsolicited_Report_Count
;
1467 psf
->sf_next
= pmc
->tomb
;
1477 #ifndef CONFIG_IP_MULTICAST
1478 #define igmp_ifc_event(x) do { } while (0)
1481 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1482 int sfcount
, __be32
*psfsrc
, int delta
)
1484 struct ip_mc_list
*pmc
;
1490 read_lock(&in_dev
->mc_list_lock
);
1491 for (pmc
=in_dev
->mc_list
; pmc
; pmc
=pmc
->next
) {
1492 if (*pmca
== pmc
->multiaddr
)
1496 /* MCA not found?? bug */
1497 read_unlock(&in_dev
->mc_list_lock
);
1500 spin_lock_bh(&pmc
->lock
);
1501 read_unlock(&in_dev
->mc_list_lock
);
1502 #ifdef CONFIG_IP_MULTICAST
1507 if (!pmc
->sfcount
[sfmode
])
1509 pmc
->sfcount
[sfmode
]--;
1512 for (i
=0; i
<sfcount
; i
++) {
1513 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1515 changerec
|= rv
> 0;
1519 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1520 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1521 pmc
->sfcount
[MCAST_INCLUDE
]) {
1522 #ifdef CONFIG_IP_MULTICAST
1523 struct ip_sf_list
*psf
;
1526 /* filter mode change */
1527 pmc
->sfmode
= MCAST_INCLUDE
;
1528 #ifdef CONFIG_IP_MULTICAST
1529 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1530 IGMP_Unsolicited_Report_Count
;
1531 in_dev
->mr_ifc_count
= pmc
->crcount
;
1532 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1533 psf
->sf_crcount
= 0;
1534 igmp_ifc_event(pmc
->interface
);
1535 } else if (sf_setstate(pmc
) || changerec
) {
1536 igmp_ifc_event(pmc
->interface
);
1540 spin_unlock_bh(&pmc
->lock
);
1545 * Add multicast single-source filter to the interface list
1547 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1548 __be32
*psfsrc
, int delta
)
1550 struct ip_sf_list
*psf
, *psf_prev
;
1553 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1554 if (psf
->sf_inaddr
== *psfsrc
)
1559 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1562 psf
->sf_inaddr
= *psfsrc
;
1564 psf_prev
->sf_next
= psf
;
1568 psf
->sf_count
[sfmode
]++;
1569 if (psf
->sf_count
[sfmode
] == 1) {
1570 ip_rt_multicast_event(pmc
->interface
);
1575 #ifdef CONFIG_IP_MULTICAST
1576 static void sf_markstate(struct ip_mc_list
*pmc
)
1578 struct ip_sf_list
*psf
;
1579 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1581 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1582 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1583 psf
->sf_oldin
= mca_xcount
==
1584 psf
->sf_count
[MCAST_EXCLUDE
] &&
1585 !psf
->sf_count
[MCAST_INCLUDE
];
1587 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1590 static int sf_setstate(struct ip_mc_list
*pmc
)
1592 struct ip_sf_list
*psf
, *dpsf
;
1593 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1594 int qrv
= pmc
->interface
->mr_qrv
;
1598 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1599 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1600 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1601 !psf
->sf_count
[MCAST_INCLUDE
];
1603 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1605 if (!psf
->sf_oldin
) {
1606 struct ip_sf_list
*prev
= NULL
;
1608 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
) {
1609 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1615 prev
->sf_next
= dpsf
->sf_next
;
1617 pmc
->tomb
= dpsf
->sf_next
;
1620 psf
->sf_crcount
= qrv
;
1623 } else if (psf
->sf_oldin
) {
1625 psf
->sf_crcount
= 0;
1627 * add or update "delete" records if an active filter
1630 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
)
1631 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1634 dpsf
= (struct ip_sf_list
*)
1635 kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1639 /* pmc->lock held by callers */
1640 dpsf
->sf_next
= pmc
->tomb
;
1643 dpsf
->sf_crcount
= qrv
;
1652 * Add multicast source filter list to the interface list
1654 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1655 int sfcount
, __be32
*psfsrc
, int delta
)
1657 struct ip_mc_list
*pmc
;
1663 read_lock(&in_dev
->mc_list_lock
);
1664 for (pmc
=in_dev
->mc_list
; pmc
; pmc
=pmc
->next
) {
1665 if (*pmca
== pmc
->multiaddr
)
1669 /* MCA not found?? bug */
1670 read_unlock(&in_dev
->mc_list_lock
);
1673 spin_lock_bh(&pmc
->lock
);
1674 read_unlock(&in_dev
->mc_list_lock
);
1676 #ifdef CONFIG_IP_MULTICAST
1679 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
1681 pmc
->sfcount
[sfmode
]++;
1683 for (i
=0; i
<sfcount
; i
++) {
1684 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
], delta
);
1691 pmc
->sfcount
[sfmode
]--;
1693 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1694 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
1695 #ifdef CONFIG_IP_MULTICAST
1696 struct in_device
*in_dev
= pmc
->interface
;
1697 struct ip_sf_list
*psf
;
1700 /* filter mode change */
1701 if (pmc
->sfcount
[MCAST_EXCLUDE
])
1702 pmc
->sfmode
= MCAST_EXCLUDE
;
1703 else if (pmc
->sfcount
[MCAST_INCLUDE
])
1704 pmc
->sfmode
= MCAST_INCLUDE
;
1705 #ifdef CONFIG_IP_MULTICAST
1706 /* else no filters; keep old mode for reports */
1708 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1709 IGMP_Unsolicited_Report_Count
;
1710 in_dev
->mr_ifc_count
= pmc
->crcount
;
1711 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1712 psf
->sf_crcount
= 0;
1713 igmp_ifc_event(in_dev
);
1714 } else if (sf_setstate(pmc
)) {
1715 igmp_ifc_event(in_dev
);
1718 spin_unlock_bh(&pmc
->lock
);
1722 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
1724 struct ip_sf_list
*psf
, *nextpsf
;
1726 for (psf
=pmc
->tomb
; psf
; psf
=nextpsf
) {
1727 nextpsf
= psf
->sf_next
;
1731 for (psf
=pmc
->sources
; psf
; psf
=nextpsf
) {
1732 nextpsf
= psf
->sf_next
;
1735 pmc
->sources
= NULL
;
1736 pmc
->sfmode
= MCAST_EXCLUDE
;
1737 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
1738 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
1743 * Join a multicast group
1745 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1748 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
1749 struct ip_mc_socklist
*iml
=NULL
, *i
;
1750 struct in_device
*in_dev
;
1751 struct inet_sock
*inet
= inet_sk(sk
);
1755 if (!MULTICAST(addr
))
1760 in_dev
= ip_mc_find_dev(imr
);
1769 ifindex
= imr
->imr_ifindex
;
1770 for (i
= inet
->mc_list
; i
; i
= i
->next
) {
1771 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
1772 i
->multi
.imr_ifindex
== ifindex
)
1777 if (count
>= sysctl_igmp_max_memberships
)
1779 iml
= sock_kmalloc(sk
,sizeof(*iml
),GFP_KERNEL
);
1783 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
1784 iml
->next
= inet
->mc_list
;
1786 iml
->sfmode
= MCAST_EXCLUDE
;
1787 inet
->mc_list
= iml
;
1788 ip_mc_inc_group(in_dev
, addr
);
1795 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
1796 struct in_device
*in_dev
)
1800 if (iml
->sflist
== 0) {
1801 /* any-source empty exclude case */
1802 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1803 iml
->sfmode
, 0, NULL
, 0);
1805 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1806 iml
->sfmode
, iml
->sflist
->sl_count
,
1807 iml
->sflist
->sl_addr
, 0);
1808 sock_kfree_s(sk
, iml
->sflist
, IP_SFLSIZE(iml
->sflist
->sl_max
));
1814 * Ask a socket to leave a group.
1817 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1819 struct inet_sock
*inet
= inet_sk(sk
);
1820 struct ip_mc_socklist
*iml
, **imlp
;
1821 struct in_device
*in_dev
;
1822 __be32 group
= imr
->imr_multiaddr
.s_addr
;
1824 int ret
= -EADDRNOTAVAIL
;
1827 in_dev
= ip_mc_find_dev(imr
);
1828 ifindex
= imr
->imr_ifindex
;
1829 for (imlp
= &inet
->mc_list
; (iml
= *imlp
) != NULL
; imlp
= &iml
->next
) {
1830 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
1833 if (iml
->multi
.imr_ifindex
!= ifindex
)
1835 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
1836 iml
->multi
.imr_address
.s_addr
)
1839 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
1844 ip_mc_dec_group(in_dev
, group
);
1846 sock_kfree_s(sk
, iml
, sizeof(*iml
));
1855 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
1856 ip_mreq_source
*mreqs
, int ifindex
)
1859 struct ip_mreqn imr
;
1860 __be32 addr
= mreqs
->imr_multiaddr
;
1861 struct ip_mc_socklist
*pmc
;
1862 struct in_device
*in_dev
= NULL
;
1863 struct inet_sock
*inet
= inet_sk(sk
);
1864 struct ip_sf_socklist
*psl
;
1868 if (!MULTICAST(addr
))
1873 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
1874 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
1875 imr
.imr_ifindex
= ifindex
;
1876 in_dev
= ip_mc_find_dev(&imr
);
1882 err
= -EADDRNOTAVAIL
;
1884 for (pmc
=inet
->mc_list
; pmc
; pmc
=pmc
->next
) {
1885 if (pmc
->multi
.imr_multiaddr
.s_addr
== imr
.imr_multiaddr
.s_addr
1886 && pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
1889 if (!pmc
) { /* must have a prior join */
1893 /* if a source filter was set, must be the same mode as before */
1895 if (pmc
->sfmode
!= omode
) {
1899 } else if (pmc
->sfmode
!= omode
) {
1900 /* allow mode switches for empty-set filters */
1901 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
1902 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
1904 pmc
->sfmode
= omode
;
1910 goto done
; /* err = -EADDRNOTAVAIL */
1912 for (i
=0; i
<psl
->sl_count
; i
++) {
1913 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
1918 if (rv
) /* source not found */
1919 goto done
; /* err = -EADDRNOTAVAIL */
1921 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1922 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
1927 /* update the interface filter */
1928 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
1929 &mreqs
->imr_sourceaddr
, 1);
1931 for (j
=i
+1; j
<psl
->sl_count
; j
++)
1932 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
1937 /* else, add a new source to the filter */
1939 if (psl
&& psl
->sl_count
>= sysctl_igmp_max_msf
) {
1943 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
1944 struct ip_sf_socklist
*newpsl
;
1945 int count
= IP_SFBLOCK
;
1948 count
+= psl
->sl_max
;
1949 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
1954 newpsl
->sl_max
= count
;
1955 newpsl
->sl_count
= count
- IP_SFBLOCK
;
1957 for (i
=0; i
<psl
->sl_count
; i
++)
1958 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
1959 sock_kfree_s(sk
, psl
, IP_SFLSIZE(psl
->sl_max
));
1961 pmc
->sflist
= psl
= newpsl
;
1963 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
1964 for (i
=0; i
<psl
->sl_count
; i
++) {
1965 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
1970 if (rv
== 0) /* address already there is an error */
1972 for (j
=psl
->sl_count
-1; j
>=i
; j
--)
1973 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
1974 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
1977 /* update the interface list */
1978 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
1979 &mreqs
->imr_sourceaddr
, 1);
1983 return ip_mc_leave_group(sk
, &imr
);
1987 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
1990 struct ip_mreqn imr
;
1991 __be32 addr
= msf
->imsf_multiaddr
;
1992 struct ip_mc_socklist
*pmc
;
1993 struct in_device
*in_dev
;
1994 struct inet_sock
*inet
= inet_sk(sk
);
1995 struct ip_sf_socklist
*newpsl
, *psl
;
1998 if (!MULTICAST(addr
))
2000 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2001 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2006 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2007 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2008 imr
.imr_ifindex
= ifindex
;
2009 in_dev
= ip_mc_find_dev(&imr
);
2016 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2017 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2022 for (pmc
=inet
->mc_list
; pmc
; pmc
=pmc
->next
) {
2023 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2024 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2027 if (!pmc
) { /* must have a prior join */
2031 if (msf
->imsf_numsrc
) {
2032 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2038 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2039 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2040 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2041 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2042 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2044 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2049 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2050 msf
->imsf_fmode
, 0, NULL
, 0);
2054 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2055 psl
->sl_count
, psl
->sl_addr
, 0);
2056 sock_kfree_s(sk
, psl
, IP_SFLSIZE(psl
->sl_max
));
2058 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2060 pmc
->sflist
= newpsl
;
2061 pmc
->sfmode
= msf
->imsf_fmode
;
2066 err
= ip_mc_leave_group(sk
, &imr
);
2070 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2071 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2073 int err
, len
, count
, copycount
;
2074 struct ip_mreqn imr
;
2075 __be32 addr
= msf
->imsf_multiaddr
;
2076 struct ip_mc_socklist
*pmc
;
2077 struct in_device
*in_dev
;
2078 struct inet_sock
*inet
= inet_sk(sk
);
2079 struct ip_sf_socklist
*psl
;
2081 if (!MULTICAST(addr
))
2086 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2087 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2088 imr
.imr_ifindex
= 0;
2089 in_dev
= ip_mc_find_dev(&imr
);
2095 err
= -EADDRNOTAVAIL
;
2097 for (pmc
=inet
->mc_list
; pmc
; pmc
=pmc
->next
) {
2098 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2099 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2102 if (!pmc
) /* must have a prior join */
2104 msf
->imsf_fmode
= pmc
->sfmode
;
2111 count
= psl
->sl_count
;
2113 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2114 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2115 msf
->imsf_numsrc
= count
;
2116 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2117 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2121 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2129 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2130 struct group_filter __user
*optval
, int __user
*optlen
)
2132 int err
, i
, count
, copycount
;
2133 struct sockaddr_in
*psin
;
2135 struct ip_mc_socklist
*pmc
;
2136 struct inet_sock
*inet
= inet_sk(sk
);
2137 struct ip_sf_socklist
*psl
;
2139 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2140 if (psin
->sin_family
!= AF_INET
)
2142 addr
= psin
->sin_addr
.s_addr
;
2143 if (!MULTICAST(addr
))
2148 err
= -EADDRNOTAVAIL
;
2150 for (pmc
=inet
->mc_list
; pmc
; pmc
=pmc
->next
) {
2151 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2152 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2155 if (!pmc
) /* must have a prior join */
2157 gsf
->gf_fmode
= pmc
->sfmode
;
2160 count
= psl
? psl
->sl_count
: 0;
2161 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2162 gsf
->gf_numsrc
= count
;
2163 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2164 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2167 for (i
=0; i
<copycount
; i
++) {
2168 struct sockaddr_in
*psin
;
2169 struct sockaddr_storage ss
;
2171 psin
= (struct sockaddr_in
*)&ss
;
2172 memset(&ss
, 0, sizeof(ss
));
2173 psin
->sin_family
= AF_INET
;
2174 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2175 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2185 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2187 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2189 struct inet_sock
*inet
= inet_sk(sk
);
2190 struct ip_mc_socklist
*pmc
;
2191 struct ip_sf_socklist
*psl
;
2194 if (!MULTICAST(loc_addr
))
2197 for (pmc
=inet
->mc_list
; pmc
; pmc
=pmc
->next
) {
2198 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2199 pmc
->multi
.imr_ifindex
== dif
)
2206 return pmc
->sfmode
== MCAST_EXCLUDE
;
2208 for (i
=0; i
<psl
->sl_count
; i
++) {
2209 if (psl
->sl_addr
[i
] == rmt_addr
)
2212 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2214 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2220 * A socket is closing.
2223 void ip_mc_drop_socket(struct sock
*sk
)
2225 struct inet_sock
*inet
= inet_sk(sk
);
2226 struct ip_mc_socklist
*iml
;
2228 if (inet
->mc_list
== NULL
)
2232 while ((iml
= inet
->mc_list
) != NULL
) {
2233 struct in_device
*in_dev
;
2234 inet
->mc_list
= iml
->next
;
2236 in_dev
= inetdev_by_index(iml
->multi
.imr_ifindex
);
2237 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2238 if (in_dev
!= NULL
) {
2239 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2242 sock_kfree_s(sk
, iml
, sizeof(*iml
));
2247 int ip_check_mc(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u16 proto
)
2249 struct ip_mc_list
*im
;
2250 struct ip_sf_list
*psf
;
2253 read_lock(&in_dev
->mc_list_lock
);
2254 for (im
=in_dev
->mc_list
; im
; im
=im
->next
) {
2255 if (im
->multiaddr
== mc_addr
)
2258 if (im
&& proto
== IPPROTO_IGMP
) {
2262 for (psf
=im
->sources
; psf
; psf
=psf
->sf_next
) {
2263 if (psf
->sf_inaddr
== src_addr
)
2267 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2268 psf
->sf_count
[MCAST_EXCLUDE
] !=
2269 im
->sfcount
[MCAST_EXCLUDE
];
2271 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2273 rv
= 1; /* unspecified source; tentatively allow */
2275 read_unlock(&in_dev
->mc_list_lock
);
2279 #if defined(CONFIG_PROC_FS)
2280 struct igmp_mc_iter_state
{
2281 struct net_device
*dev
;
2282 struct in_device
*in_dev
;
2285 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2287 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2289 struct ip_mc_list
*im
= NULL
;
2290 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2292 for (state
->dev
= dev_base
, state
->in_dev
= NULL
;
2294 state
->dev
= state
->dev
->next
) {
2295 struct in_device
*in_dev
;
2296 in_dev
= in_dev_get(state
->dev
);
2299 read_lock(&in_dev
->mc_list_lock
);
2300 im
= in_dev
->mc_list
;
2302 state
->in_dev
= in_dev
;
2305 read_unlock(&in_dev
->mc_list_lock
);
2311 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2313 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2316 if (likely(state
->in_dev
!= NULL
)) {
2317 read_unlock(&state
->in_dev
->mc_list_lock
);
2318 in_dev_put(state
->in_dev
);
2320 state
->dev
= state
->dev
->next
;
2322 state
->in_dev
= NULL
;
2325 state
->in_dev
= in_dev_get(state
->dev
);
2328 read_lock(&state
->in_dev
->mc_list_lock
);
2329 im
= state
->in_dev
->mc_list
;
2334 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2336 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2338 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2340 return pos
? NULL
: im
;
2343 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2345 read_lock(&dev_base_lock
);
2346 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2349 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2351 struct ip_mc_list
*im
;
2352 if (v
== SEQ_START_TOKEN
)
2353 im
= igmp_mc_get_first(seq
);
2355 im
= igmp_mc_get_next(seq
, v
);
2360 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2362 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2363 if (likely(state
->in_dev
!= NULL
)) {
2364 read_unlock(&state
->in_dev
->mc_list_lock
);
2365 in_dev_put(state
->in_dev
);
2366 state
->in_dev
= NULL
;
2369 read_unlock(&dev_base_lock
);
2372 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2374 if (v
== SEQ_START_TOKEN
)
2376 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2378 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2379 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2381 #ifdef CONFIG_IP_MULTICAST
2382 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2383 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2389 if (state
->in_dev
->mc_list
== im
) {
2390 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2391 state
->dev
->ifindex
, state
->dev
->name
, state
->dev
->mc_count
, querier
);
2395 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2396 im
->multiaddr
, im
->users
,
2397 im
->tm_running
, im
->tm_running
?
2398 jiffies_to_clock_t(im
->timer
.expires
-jiffies
) : 0,
2404 static const struct seq_operations igmp_mc_seq_ops
= {
2405 .start
= igmp_mc_seq_start
,
2406 .next
= igmp_mc_seq_next
,
2407 .stop
= igmp_mc_seq_stop
,
2408 .show
= igmp_mc_seq_show
,
2411 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2413 struct seq_file
*seq
;
2415 struct igmp_mc_iter_state
*s
= kzalloc(sizeof(*s
), GFP_KERNEL
);
2419 rc
= seq_open(file
, &igmp_mc_seq_ops
);
2423 seq
= file
->private_data
;
2432 static const struct file_operations igmp_mc_seq_fops
= {
2433 .owner
= THIS_MODULE
,
2434 .open
= igmp_mc_seq_open
,
2436 .llseek
= seq_lseek
,
2437 .release
= seq_release_private
,
2440 struct igmp_mcf_iter_state
{
2441 struct net_device
*dev
;
2442 struct in_device
*idev
;
2443 struct ip_mc_list
*im
;
2446 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2448 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2450 struct ip_sf_list
*psf
= NULL
;
2451 struct ip_mc_list
*im
= NULL
;
2452 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2454 for (state
->dev
= dev_base
, state
->idev
= NULL
, state
->im
= NULL
;
2456 state
->dev
= state
->dev
->next
) {
2457 struct in_device
*idev
;
2458 idev
= in_dev_get(state
->dev
);
2459 if (unlikely(idev
== NULL
))
2461 read_lock(&idev
->mc_list_lock
);
2463 if (likely(im
!= NULL
)) {
2464 spin_lock_bh(&im
->lock
);
2466 if (likely(psf
!= NULL
)) {
2471 spin_unlock_bh(&im
->lock
);
2473 read_unlock(&idev
->mc_list_lock
);
2479 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2481 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2485 spin_unlock_bh(&state
->im
->lock
);
2486 state
->im
= state
->im
->next
;
2487 while (!state
->im
) {
2488 if (likely(state
->idev
!= NULL
)) {
2489 read_unlock(&state
->idev
->mc_list_lock
);
2490 in_dev_put(state
->idev
);
2492 state
->dev
= state
->dev
->next
;
2497 state
->idev
= in_dev_get(state
->dev
);
2500 read_lock(&state
->idev
->mc_list_lock
);
2501 state
->im
= state
->idev
->mc_list
;
2505 spin_lock_bh(&state
->im
->lock
);
2506 psf
= state
->im
->sources
;
2512 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2514 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2516 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2518 return pos
? NULL
: psf
;
2521 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2523 read_lock(&dev_base_lock
);
2524 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2527 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2529 struct ip_sf_list
*psf
;
2530 if (v
== SEQ_START_TOKEN
)
2531 psf
= igmp_mcf_get_first(seq
);
2533 psf
= igmp_mcf_get_next(seq
, v
);
2538 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2540 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2541 if (likely(state
->im
!= NULL
)) {
2542 spin_unlock_bh(&state
->im
->lock
);
2545 if (likely(state
->idev
!= NULL
)) {
2546 read_unlock(&state
->idev
->mc_list_lock
);
2547 in_dev_put(state
->idev
);
2551 read_unlock(&dev_base_lock
);
2554 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2556 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2557 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2559 if (v
== SEQ_START_TOKEN
) {
2562 "%10s %10s %6s %6s\n", "Idx",
2564 "SRC", "INC", "EXC");
2568 "0x%08x %6lu %6lu\n",
2569 state
->dev
->ifindex
, state
->dev
->name
,
2570 ntohl(state
->im
->multiaddr
),
2571 ntohl(psf
->sf_inaddr
),
2572 psf
->sf_count
[MCAST_INCLUDE
],
2573 psf
->sf_count
[MCAST_EXCLUDE
]);
2578 static const struct seq_operations igmp_mcf_seq_ops
= {
2579 .start
= igmp_mcf_seq_start
,
2580 .next
= igmp_mcf_seq_next
,
2581 .stop
= igmp_mcf_seq_stop
,
2582 .show
= igmp_mcf_seq_show
,
2585 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2587 struct seq_file
*seq
;
2589 struct igmp_mcf_iter_state
*s
= kzalloc(sizeof(*s
), GFP_KERNEL
);
2593 rc
= seq_open(file
, &igmp_mcf_seq_ops
);
2597 seq
= file
->private_data
;
2606 static const struct file_operations igmp_mcf_seq_fops
= {
2607 .owner
= THIS_MODULE
,
2608 .open
= igmp_mcf_seq_open
,
2610 .llseek
= seq_lseek
,
2611 .release
= seq_release_private
,
2614 int __init
igmp_mc_proc_init(void)
2616 proc_net_fops_create("igmp", S_IRUGO
, &igmp_mc_seq_fops
);
2617 proc_net_fops_create("mcfilter", S_IRUGO
, &igmp_mcf_seq_fops
);
2622 EXPORT_SYMBOL(ip_mc_dec_group
);
2623 EXPORT_SYMBOL(ip_mc_inc_group
);
2624 EXPORT_SYMBOL(ip_mc_join_group
);
2625 EXPORT_SYMBOL(ip_mc_rejoin_group
);