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 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
305 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, int size
)
310 struct igmpv3_report
*pig
;
311 struct net
*net
= dev_net(dev
);
315 skb
= alloc_skb(size
+ LL_ALLOCATED_SPACE(dev
),
316 GFP_ATOMIC
| __GFP_NOWARN
);
323 igmp_skb_size(skb
) = size
;
325 rt
= ip_route_output_ports(net
, &fl4
, NULL
, IGMPV3_ALL_MCR
, 0,
327 IPPROTO_IGMP
, 0, dev
->ifindex
);
333 skb_dst_set(skb
, &rt
->dst
);
336 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
338 skb_reset_network_header(skb
);
340 skb_put(skb
, sizeof(struct iphdr
) + 4);
343 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
345 pip
->frag_off
= htons(IP_DF
);
347 pip
->daddr
= fl4
.daddr
;
348 pip
->saddr
= fl4
.saddr
;
349 pip
->protocol
= IPPROTO_IGMP
;
350 pip
->tot_len
= 0; /* filled in later */
351 ip_select_ident(pip
, &rt
->dst
, NULL
);
352 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
353 ((u8
*)&pip
[1])[1] = 4;
354 ((u8
*)&pip
[1])[2] = 0;
355 ((u8
*)&pip
[1])[3] = 0;
357 skb
->transport_header
= skb
->network_header
+ sizeof(struct iphdr
) + 4;
358 skb_put(skb
, sizeof(*pig
));
359 pig
= igmpv3_report_hdr(skb
);
360 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
368 static int igmpv3_sendpack(struct sk_buff
*skb
)
370 struct igmphdr
*pig
= igmp_hdr(skb
);
371 const int igmplen
= skb
->tail
- skb
->transport_header
;
373 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
375 return ip_local_out(skb
);
378 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
380 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
, type
, gdel
, sdel
);
383 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
384 int type
, struct igmpv3_grec
**ppgr
)
386 struct net_device
*dev
= pmc
->interface
->dev
;
387 struct igmpv3_report
*pih
;
388 struct igmpv3_grec
*pgr
;
391 skb
= igmpv3_newpack(dev
, dev
->mtu
);
394 pgr
= (struct igmpv3_grec
*)skb_put(skb
, sizeof(struct igmpv3_grec
));
395 pgr
->grec_type
= type
;
396 pgr
->grec_auxwords
= 0;
398 pgr
->grec_mca
= pmc
->multiaddr
;
399 pih
= igmpv3_report_hdr(skb
);
400 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
405 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
406 skb_tailroom(skb)) : 0)
408 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
409 int type
, int gdeleted
, int sdeleted
)
411 struct net_device
*dev
= pmc
->interface
->dev
;
412 struct igmpv3_report
*pih
;
413 struct igmpv3_grec
*pgr
= NULL
;
414 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
415 int scount
, stotal
, first
, isquery
, truncate
;
417 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
420 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
421 type
== IGMPV3_MODE_IS_EXCLUDE
;
422 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
423 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
427 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
432 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
434 /* EX and TO_EX get a fresh packet, if needed */
436 if (pih
&& pih
->ngrec
&&
437 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
439 igmpv3_sendpack(skb
);
440 skb
= igmpv3_newpack(dev
, dev
->mtu
);
445 for (psf
=*psf_list
; psf
; psf
=psf_next
) {
448 psf_next
= psf
->sf_next
;
450 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
455 /* clear marks on query responses */
459 if (AVAILABLE(skb
) < sizeof(__be32
) +
460 first
*sizeof(struct igmpv3_grec
)) {
461 if (truncate
&& !first
)
462 break; /* truncate these */
464 pgr
->grec_nsrcs
= htons(scount
);
466 igmpv3_sendpack(skb
);
467 skb
= igmpv3_newpack(dev
, dev
->mtu
);
472 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
477 psrc
= (__be32
*)skb_put(skb
, sizeof(__be32
));
478 *psrc
= psf
->sf_inaddr
;
480 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
481 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
483 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
485 psf_prev
->sf_next
= psf
->sf_next
;
487 *psf_list
= psf
->sf_next
;
497 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
498 type
== IGMPV3_BLOCK_OLD_SOURCES
)
500 if (pmc
->crcount
|| isquery
) {
501 /* make sure we have room for group header */
502 if (skb
&& AVAILABLE(skb
)<sizeof(struct igmpv3_grec
)) {
503 igmpv3_sendpack(skb
);
504 skb
= NULL
; /* add_grhead will get a new one */
506 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
510 pgr
->grec_nsrcs
= htons(scount
);
513 pmc
->gsquery
= 0; /* clear query state on report */
517 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
519 struct sk_buff
*skb
= NULL
;
524 for_each_pmc_rcu(in_dev
, pmc
) {
525 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
527 spin_lock_bh(&pmc
->lock
);
528 if (pmc
->sfcount
[MCAST_EXCLUDE
])
529 type
= IGMPV3_MODE_IS_EXCLUDE
;
531 type
= IGMPV3_MODE_IS_INCLUDE
;
532 skb
= add_grec(skb
, pmc
, type
, 0, 0);
533 spin_unlock_bh(&pmc
->lock
);
537 spin_lock_bh(&pmc
->lock
);
538 if (pmc
->sfcount
[MCAST_EXCLUDE
])
539 type
= IGMPV3_MODE_IS_EXCLUDE
;
541 type
= IGMPV3_MODE_IS_INCLUDE
;
542 skb
= add_grec(skb
, pmc
, type
, 0, 0);
543 spin_unlock_bh(&pmc
->lock
);
547 return igmpv3_sendpack(skb
);
551 * remove zero-count source records from a source filter list
553 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
555 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
558 for (psf
=*ppsf
; psf
; psf
= psf_next
) {
559 psf_next
= psf
->sf_next
;
560 if (psf
->sf_crcount
== 0) {
562 psf_prev
->sf_next
= psf
->sf_next
;
564 *ppsf
= psf
->sf_next
;
571 static void igmpv3_send_cr(struct in_device
*in_dev
)
573 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
574 struct sk_buff
*skb
= NULL
;
578 spin_lock_bh(&in_dev
->mc_tomb_lock
);
582 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc_next
) {
583 pmc_next
= pmc
->next
;
584 if (pmc
->sfmode
== MCAST_INCLUDE
) {
585 type
= IGMPV3_BLOCK_OLD_SOURCES
;
586 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
587 skb
= add_grec(skb
, pmc
, type
, 1, 0);
588 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
591 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
592 type
= IGMPV3_CHANGE_TO_INCLUDE
;
593 skb
= add_grec(skb
, pmc
, type
, 1, 0);
596 if (pmc
->crcount
== 0) {
597 igmpv3_clear_zeros(&pmc
->tomb
);
598 igmpv3_clear_zeros(&pmc
->sources
);
601 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
603 pmc_prev
->next
= pmc_next
;
605 in_dev
->mc_tomb
= pmc_next
;
606 in_dev_put(pmc
->interface
);
611 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
614 for_each_pmc_rcu(in_dev
, pmc
) {
615 spin_lock_bh(&pmc
->lock
);
616 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
617 type
= IGMPV3_BLOCK_OLD_SOURCES
;
618 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
620 type
= IGMPV3_ALLOW_NEW_SOURCES
;
621 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
623 skb
= add_grec(skb
, pmc
, type
, 0, 0);
624 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
626 /* filter mode changes */
628 if (pmc
->sfmode
== MCAST_EXCLUDE
)
629 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
631 type
= IGMPV3_CHANGE_TO_INCLUDE
;
632 skb
= add_grec(skb
, pmc
, type
, 0, 0);
635 spin_unlock_bh(&pmc
->lock
);
641 (void) igmpv3_sendpack(skb
);
644 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
651 struct net_device
*dev
= in_dev
->dev
;
652 struct net
*net
= dev_net(dev
);
653 __be32 group
= pmc
? pmc
->multiaddr
: 0;
657 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
658 return igmpv3_send_report(in_dev
, pmc
);
659 else if (type
== IGMP_HOST_LEAVE_MESSAGE
)
660 dst
= IGMP_ALL_ROUTER
;
664 rt
= ip_route_output_ports(net
, &fl4
, NULL
, dst
, 0,
666 IPPROTO_IGMP
, 0, dev
->ifindex
);
670 skb
= alloc_skb(IGMP_SIZE
+LL_ALLOCATED_SPACE(dev
), GFP_ATOMIC
);
676 skb_dst_set(skb
, &rt
->dst
);
678 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
680 skb_reset_network_header(skb
);
682 skb_put(skb
, sizeof(struct iphdr
) + 4);
685 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
687 iph
->frag_off
= htons(IP_DF
);
690 iph
->saddr
= fl4
.saddr
;
691 iph
->protocol
= IPPROTO_IGMP
;
692 ip_select_ident(iph
, &rt
->dst
, NULL
);
693 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
694 ((u8
*)&iph
[1])[1] = 4;
695 ((u8
*)&iph
[1])[2] = 0;
696 ((u8
*)&iph
[1])[3] = 0;
698 ih
= (struct igmphdr
*)skb_put(skb
, sizeof(struct igmphdr
));
703 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
705 return ip_local_out(skb
);
708 static void igmp_gq_timer_expire(unsigned long data
)
710 struct in_device
*in_dev
= (struct in_device
*)data
;
712 in_dev
->mr_gq_running
= 0;
713 igmpv3_send_report(in_dev
, NULL
);
714 __in_dev_put(in_dev
);
717 static void igmp_ifc_timer_expire(unsigned long data
)
719 struct in_device
*in_dev
= (struct in_device
*)data
;
721 igmpv3_send_cr(in_dev
);
722 if (in_dev
->mr_ifc_count
) {
723 in_dev
->mr_ifc_count
--;
724 igmp_ifc_start_timer(in_dev
, IGMP_Unsolicited_Report_Interval
);
726 __in_dev_put(in_dev
);
729 static void igmp_ifc_event(struct in_device
*in_dev
)
731 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
733 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
734 IGMP_Unsolicited_Report_Count
;
735 igmp_ifc_start_timer(in_dev
, 1);
739 static void igmp_timer_expire(unsigned long data
)
741 struct ip_mc_list
*im
=(struct ip_mc_list
*)data
;
742 struct in_device
*in_dev
= im
->interface
;
744 spin_lock(&im
->lock
);
747 if (im
->unsolicit_count
) {
748 im
->unsolicit_count
--;
749 igmp_start_timer(im
, IGMP_Unsolicited_Report_Interval
);
752 spin_unlock(&im
->lock
);
754 if (IGMP_V1_SEEN(in_dev
))
755 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
756 else if (IGMP_V2_SEEN(in_dev
))
757 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
759 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
764 /* mark EXCLUDE-mode sources */
765 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
767 struct ip_sf_list
*psf
;
771 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
774 for (i
=0; i
<nsrcs
; i
++) {
775 /* skip inactive filters */
776 if (pmc
->sfcount
[MCAST_INCLUDE
] ||
777 pmc
->sfcount
[MCAST_EXCLUDE
] !=
778 psf
->sf_count
[MCAST_EXCLUDE
])
780 if (srcs
[i
] == psf
->sf_inaddr
) {
787 if (scount
== nsrcs
) /* all sources excluded */
792 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
794 struct ip_sf_list
*psf
;
797 if (pmc
->sfmode
== MCAST_EXCLUDE
)
798 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
800 /* mark INCLUDE-mode sources */
802 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
805 for (i
=0; i
<nsrcs
; i
++)
806 if (srcs
[i
] == psf
->sf_inaddr
) {
820 static void igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
822 struct ip_mc_list
*im
;
824 /* Timers are only set for non-local groups */
826 if (group
== IGMP_ALL_HOSTS
)
830 for_each_pmc_rcu(in_dev
, im
) {
831 if (im
->multiaddr
== group
) {
839 static void igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
842 struct igmphdr
*ih
= igmp_hdr(skb
);
843 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
844 struct ip_mc_list
*im
;
845 __be32 group
= ih
->group
;
852 /* Alas, old v1 router presents here. */
854 max_delay
= IGMP_Query_Response_Interval
;
855 in_dev
->mr_v1_seen
= jiffies
+
856 IGMP_V1_Router_Present_Timeout
;
859 /* v2 router present */
860 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
861 in_dev
->mr_v2_seen
= jiffies
+
862 IGMP_V2_Router_Present_Timeout
;
864 /* cancel the interface change timer */
865 in_dev
->mr_ifc_count
= 0;
866 if (del_timer(&in_dev
->mr_ifc_timer
))
867 __in_dev_put(in_dev
);
868 /* clear deleted report items */
869 igmpv3_clear_delrec(in_dev
);
870 } else if (len
< 12) {
871 return; /* ignore bogus packet; freed by caller */
872 } else if (IGMP_V1_SEEN(in_dev
)) {
873 /* This is a v3 query with v1 queriers present */
874 max_delay
= IGMP_Query_Response_Interval
;
876 } else if (IGMP_V2_SEEN(in_dev
)) {
877 /* this is a v3 query with v2 queriers present;
878 * Interpretation of the max_delay code is problematic here.
879 * A real v2 host would use ih_code directly, while v3 has a
880 * different encoding. We use the v3 encoding as more likely
881 * to be intended in a v3 query.
883 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
885 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
888 ih3
= igmpv3_query_hdr(skb
);
890 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
891 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
893 ih3
= igmpv3_query_hdr(skb
);
896 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
898 max_delay
= 1; /* can't mod w/ 0 */
899 in_dev
->mr_maxdelay
= max_delay
;
901 in_dev
->mr_qrv
= ih3
->qrv
;
902 if (!group
) { /* general query */
904 return; /* no sources allowed */
905 igmp_gq_start_timer(in_dev
);
908 /* mark sources to include, if group & source-specific */
909 mark
= ih3
->nsrcs
!= 0;
913 * - Start the timers in all of our membership records
914 * that the query applies to for the interface on
915 * which the query arrived excl. those that belong
916 * to a "local" group (224.0.0.X)
917 * - For timers already running check if they need to
919 * - Use the igmp->igmp_code field as the maximum
923 for_each_pmc_rcu(in_dev
, im
) {
926 if (group
&& group
!= im
->multiaddr
)
928 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
930 spin_lock_bh(&im
->lock
);
932 im
->gsquery
= im
->gsquery
&& mark
;
935 changed
= !im
->gsquery
||
936 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
937 spin_unlock_bh(&im
->lock
);
939 igmp_mod_timer(im
, max_delay
);
944 /* called in rcu_read_lock() section */
945 int igmp_rcv(struct sk_buff
*skb
)
947 /* This basically follows the spec line by line -- see RFC1112 */
949 struct in_device
*in_dev
= __in_dev_get_rcu(skb
->dev
);
955 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
958 switch (skb
->ip_summed
) {
959 case CHECKSUM_COMPLETE
:
960 if (!csum_fold(skb
->csum
))
965 if (__skb_checksum_complete(skb
))
971 case IGMP_HOST_MEMBERSHIP_QUERY
:
972 igmp_heard_query(in_dev
, skb
, len
);
974 case IGMP_HOST_MEMBERSHIP_REPORT
:
975 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
976 /* Is it our report looped back? */
977 if (rt_is_output_route(skb_rtable(skb
)))
979 /* don't rely on MC router hearing unicast reports */
980 if (skb
->pkt_type
== PACKET_MULTICAST
||
981 skb
->pkt_type
== PACKET_BROADCAST
)
982 igmp_heard_report(in_dev
, ih
->group
);
985 #ifdef CONFIG_IP_PIMSM_V1
986 return pim_rcv_v1(skb
);
988 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
991 case IGMP_HOST_LEAVE_MESSAGE
:
993 case IGMP_MTRACE_RESP
:
1008 * Add a filter to a device
1011 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
1013 char buf
[MAX_ADDR_LEN
];
1014 struct net_device
*dev
= in_dev
->dev
;
1016 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1017 We will get multicast token leakage, when IFF_MULTICAST
1018 is changed. This check should be done in dev->set_multicast_list
1019 routine. Something sort of:
1020 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1023 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1024 dev_mc_add(dev
, buf
);
1028 * Remove a filter from a device
1031 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1033 char buf
[MAX_ADDR_LEN
];
1034 struct net_device
*dev
= in_dev
->dev
;
1036 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1037 dev_mc_del(dev
, buf
);
1040 #ifdef CONFIG_IP_MULTICAST
1042 * deleted ip_mc_list manipulation
1044 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1046 struct ip_mc_list
*pmc
;
1048 /* this is an "ip_mc_list" for convenience; only the fields below
1049 * are actually used. In particular, the refcnt and users are not
1050 * used for management of the delete list. Using the same structure
1051 * for deleted items allows change reports to use common code with
1052 * non-deleted or query-response MCA's.
1054 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1057 spin_lock_bh(&im
->lock
);
1058 pmc
->interface
= im
->interface
;
1059 in_dev_hold(in_dev
);
1060 pmc
->multiaddr
= im
->multiaddr
;
1061 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1062 IGMP_Unsolicited_Report_Count
;
1063 pmc
->sfmode
= im
->sfmode
;
1064 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1065 struct ip_sf_list
*psf
;
1067 pmc
->tomb
= im
->tomb
;
1068 pmc
->sources
= im
->sources
;
1069 im
->tomb
= im
->sources
= NULL
;
1070 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1071 psf
->sf_crcount
= pmc
->crcount
;
1073 spin_unlock_bh(&im
->lock
);
1075 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1076 pmc
->next
= in_dev
->mc_tomb
;
1077 in_dev
->mc_tomb
= pmc
;
1078 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1081 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
)
1083 struct ip_mc_list
*pmc
, *pmc_prev
;
1084 struct ip_sf_list
*psf
, *psf_next
;
1086 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1088 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc
->next
) {
1089 if (pmc
->multiaddr
== multiaddr
)
1095 pmc_prev
->next
= pmc
->next
;
1097 in_dev
->mc_tomb
= pmc
->next
;
1099 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1101 for (psf
=pmc
->tomb
; psf
; psf
=psf_next
) {
1102 psf_next
= psf
->sf_next
;
1105 in_dev_put(pmc
->interface
);
1110 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1112 struct ip_mc_list
*pmc
, *nextpmc
;
1114 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1115 pmc
= in_dev
->mc_tomb
;
1116 in_dev
->mc_tomb
= NULL
;
1117 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1119 for (; pmc
; pmc
= nextpmc
) {
1120 nextpmc
= pmc
->next
;
1121 ip_mc_clear_src(pmc
);
1122 in_dev_put(pmc
->interface
);
1125 /* clear dead sources, too */
1127 for_each_pmc_rcu(in_dev
, pmc
) {
1128 struct ip_sf_list
*psf
, *psf_next
;
1130 spin_lock_bh(&pmc
->lock
);
1133 spin_unlock_bh(&pmc
->lock
);
1134 for (; psf
; psf
=psf_next
) {
1135 psf_next
= psf
->sf_next
;
1143 static void igmp_group_dropped(struct ip_mc_list
*im
)
1145 struct in_device
*in_dev
= im
->interface
;
1146 #ifdef CONFIG_IP_MULTICAST
1152 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1155 #ifdef CONFIG_IP_MULTICAST
1156 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1159 reporter
= im
->reporter
;
1160 igmp_stop_timer(im
);
1162 if (!in_dev
->dead
) {
1163 if (IGMP_V1_SEEN(in_dev
))
1165 if (IGMP_V2_SEEN(in_dev
)) {
1167 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1171 igmpv3_add_delrec(in_dev
, im
);
1173 igmp_ifc_event(in_dev
);
1177 ip_mc_clear_src(im
);
1180 static void igmp_group_added(struct ip_mc_list
*im
)
1182 struct in_device
*in_dev
= im
->interface
;
1184 if (im
->loaded
== 0) {
1186 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1189 #ifdef CONFIG_IP_MULTICAST
1190 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1195 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1196 spin_lock_bh(&im
->lock
);
1197 igmp_start_timer(im
, IGMP_Initial_Report_Delay
);
1198 spin_unlock_bh(&im
->lock
);
1203 im
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1204 IGMP_Unsolicited_Report_Count
;
1205 igmp_ifc_event(in_dev
);
1211 * Multicast list managers
1216 * A socket has joined a multicast group on device dev.
1219 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1221 struct ip_mc_list
*im
;
1225 for_each_pmc_rtnl(in_dev
, im
) {
1226 if (im
->multiaddr
== addr
) {
1228 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1233 im
= kzalloc(sizeof(*im
), GFP_KERNEL
);
1238 im
->interface
= in_dev
;
1239 in_dev_hold(in_dev
);
1240 im
->multiaddr
= addr
;
1241 /* initial mode is (EX, empty) */
1242 im
->sfmode
= MCAST_EXCLUDE
;
1243 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1244 atomic_set(&im
->refcnt
, 1);
1245 spin_lock_init(&im
->lock
);
1246 #ifdef CONFIG_IP_MULTICAST
1247 setup_timer(&im
->timer
, &igmp_timer_expire
, (unsigned long)im
);
1248 im
->unsolicit_count
= IGMP_Unsolicited_Report_Count
;
1251 im
->next_rcu
= in_dev
->mc_list
;
1253 rcu_assign_pointer(in_dev
->mc_list
, im
);
1255 #ifdef CONFIG_IP_MULTICAST
1256 igmpv3_del_delrec(in_dev
, im
->multiaddr
);
1258 igmp_group_added(im
);
1260 ip_rt_multicast_event(in_dev
);
1264 EXPORT_SYMBOL(ip_mc_inc_group
);
1267 * Resend IGMP JOIN report; used for bonding.
1268 * Called with rcu_read_lock()
1270 void ip_mc_rejoin_groups(struct in_device
*in_dev
)
1272 #ifdef CONFIG_IP_MULTICAST
1273 struct ip_mc_list
*im
;
1276 for_each_pmc_rcu(in_dev
, im
) {
1277 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1280 /* a failover is happening and switches
1281 * must be notified immediately
1283 if (IGMP_V1_SEEN(in_dev
))
1284 type
= IGMP_HOST_MEMBERSHIP_REPORT
;
1285 else if (IGMP_V2_SEEN(in_dev
))
1286 type
= IGMPV2_HOST_MEMBERSHIP_REPORT
;
1288 type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
1289 igmp_send_report(in_dev
, im
, type
);
1293 EXPORT_SYMBOL(ip_mc_rejoin_groups
);
1296 * A socket has left a multicast group on device dev
1299 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1301 struct ip_mc_list
*i
;
1302 struct ip_mc_list __rcu
**ip
;
1306 for (ip
= &in_dev
->mc_list
;
1307 (i
= rtnl_dereference(*ip
)) != NULL
;
1308 ip
= &i
->next_rcu
) {
1309 if (i
->multiaddr
== addr
) {
1310 if (--i
->users
== 0) {
1313 igmp_group_dropped(i
);
1316 ip_rt_multicast_event(in_dev
);
1325 EXPORT_SYMBOL(ip_mc_dec_group
);
1327 /* Device changing type */
1329 void ip_mc_unmap(struct in_device
*in_dev
)
1331 struct ip_mc_list
*pmc
;
1335 for_each_pmc_rtnl(in_dev
, pmc
)
1336 igmp_group_dropped(pmc
);
1339 void ip_mc_remap(struct in_device
*in_dev
)
1341 struct ip_mc_list
*pmc
;
1345 for_each_pmc_rtnl(in_dev
, pmc
)
1346 igmp_group_added(pmc
);
1349 /* Device going down */
1351 void ip_mc_down(struct in_device
*in_dev
)
1353 struct ip_mc_list
*pmc
;
1357 for_each_pmc_rtnl(in_dev
, pmc
)
1358 igmp_group_dropped(pmc
);
1360 #ifdef CONFIG_IP_MULTICAST
1361 in_dev
->mr_ifc_count
= 0;
1362 if (del_timer(&in_dev
->mr_ifc_timer
))
1363 __in_dev_put(in_dev
);
1364 in_dev
->mr_gq_running
= 0;
1365 if (del_timer(&in_dev
->mr_gq_timer
))
1366 __in_dev_put(in_dev
);
1367 igmpv3_clear_delrec(in_dev
);
1370 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1373 void ip_mc_init_dev(struct in_device
*in_dev
)
1377 in_dev
->mc_tomb
= NULL
;
1378 #ifdef CONFIG_IP_MULTICAST
1379 in_dev
->mr_gq_running
= 0;
1380 setup_timer(&in_dev
->mr_gq_timer
, igmp_gq_timer_expire
,
1381 (unsigned long)in_dev
);
1382 in_dev
->mr_ifc_count
= 0;
1383 in_dev
->mc_count
= 0;
1384 setup_timer(&in_dev
->mr_ifc_timer
, igmp_ifc_timer_expire
,
1385 (unsigned long)in_dev
);
1386 in_dev
->mr_qrv
= IGMP_Unsolicited_Report_Count
;
1389 spin_lock_init(&in_dev
->mc_tomb_lock
);
1392 /* Device going up */
1394 void ip_mc_up(struct in_device
*in_dev
)
1396 struct ip_mc_list
*pmc
;
1400 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1402 for_each_pmc_rtnl(in_dev
, pmc
)
1403 igmp_group_added(pmc
);
1407 * Device is about to be destroyed: clean up.
1410 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1412 struct ip_mc_list
*i
;
1416 /* Deactivate timers */
1419 while ((i
= rtnl_dereference(in_dev
->mc_list
)) != NULL
) {
1420 in_dev
->mc_list
= i
->next_rcu
;
1423 igmp_group_dropped(i
);
1428 /* RTNL is locked */
1429 static struct in_device
*ip_mc_find_dev(struct net
*net
, struct ip_mreqn
*imr
)
1431 struct net_device
*dev
= NULL
;
1432 struct in_device
*idev
= NULL
;
1434 if (imr
->imr_ifindex
) {
1435 idev
= inetdev_by_index(net
, imr
->imr_ifindex
);
1438 if (imr
->imr_address
.s_addr
) {
1439 dev
= __ip_dev_find(net
, imr
->imr_address
.s_addr
, false);
1445 struct rtable
*rt
= ip_route_output(net
,
1446 imr
->imr_multiaddr
.s_addr
,
1454 imr
->imr_ifindex
= dev
->ifindex
;
1455 idev
= __in_dev_get_rtnl(dev
);
1461 * Join a socket to a group
1463 int sysctl_igmp_max_memberships __read_mostly
= IP_MAX_MEMBERSHIPS
;
1464 int sysctl_igmp_max_msf __read_mostly
= IP_MAX_MSF
;
1467 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1470 struct ip_sf_list
*psf
, *psf_prev
;
1474 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1475 if (psf
->sf_inaddr
== *psfsrc
)
1479 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1480 /* source filter not found, or count wrong => bug */
1483 psf
->sf_count
[sfmode
]--;
1484 if (psf
->sf_count
[sfmode
] == 0) {
1485 ip_rt_multicast_event(pmc
->interface
);
1487 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1488 #ifdef CONFIG_IP_MULTICAST
1489 struct in_device
*in_dev
= pmc
->interface
;
1492 /* no more filters for this source */
1494 psf_prev
->sf_next
= psf
->sf_next
;
1496 pmc
->sources
= psf
->sf_next
;
1497 #ifdef CONFIG_IP_MULTICAST
1498 if (psf
->sf_oldin
&&
1499 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1500 psf
->sf_crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1501 IGMP_Unsolicited_Report_Count
;
1502 psf
->sf_next
= pmc
->tomb
;
1512 #ifndef CONFIG_IP_MULTICAST
1513 #define igmp_ifc_event(x) do { } while (0)
1516 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1517 int sfcount
, __be32
*psfsrc
, int delta
)
1519 struct ip_mc_list
*pmc
;
1526 for_each_pmc_rcu(in_dev
, pmc
) {
1527 if (*pmca
== pmc
->multiaddr
)
1531 /* MCA not found?? bug */
1535 spin_lock_bh(&pmc
->lock
);
1537 #ifdef CONFIG_IP_MULTICAST
1542 if (!pmc
->sfcount
[sfmode
])
1544 pmc
->sfcount
[sfmode
]--;
1547 for (i
=0; i
<sfcount
; i
++) {
1548 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1550 changerec
|= rv
> 0;
1554 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1555 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1556 pmc
->sfcount
[MCAST_INCLUDE
]) {
1557 #ifdef CONFIG_IP_MULTICAST
1558 struct ip_sf_list
*psf
;
1561 /* filter mode change */
1562 pmc
->sfmode
= MCAST_INCLUDE
;
1563 #ifdef CONFIG_IP_MULTICAST
1564 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1565 IGMP_Unsolicited_Report_Count
;
1566 in_dev
->mr_ifc_count
= pmc
->crcount
;
1567 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1568 psf
->sf_crcount
= 0;
1569 igmp_ifc_event(pmc
->interface
);
1570 } else if (sf_setstate(pmc
) || changerec
) {
1571 igmp_ifc_event(pmc
->interface
);
1575 spin_unlock_bh(&pmc
->lock
);
1580 * Add multicast single-source filter to the interface list
1582 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1583 __be32
*psfsrc
, int delta
)
1585 struct ip_sf_list
*psf
, *psf_prev
;
1588 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1589 if (psf
->sf_inaddr
== *psfsrc
)
1594 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1597 psf
->sf_inaddr
= *psfsrc
;
1599 psf_prev
->sf_next
= psf
;
1603 psf
->sf_count
[sfmode
]++;
1604 if (psf
->sf_count
[sfmode
] == 1) {
1605 ip_rt_multicast_event(pmc
->interface
);
1610 #ifdef CONFIG_IP_MULTICAST
1611 static void sf_markstate(struct ip_mc_list
*pmc
)
1613 struct ip_sf_list
*psf
;
1614 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1616 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1617 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1618 psf
->sf_oldin
= mca_xcount
==
1619 psf
->sf_count
[MCAST_EXCLUDE
] &&
1620 !psf
->sf_count
[MCAST_INCLUDE
];
1622 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1625 static int sf_setstate(struct ip_mc_list
*pmc
)
1627 struct ip_sf_list
*psf
, *dpsf
;
1628 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1629 int qrv
= pmc
->interface
->mr_qrv
;
1633 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1634 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1635 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1636 !psf
->sf_count
[MCAST_INCLUDE
];
1638 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1640 if (!psf
->sf_oldin
) {
1641 struct ip_sf_list
*prev
= NULL
;
1643 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
) {
1644 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1650 prev
->sf_next
= dpsf
->sf_next
;
1652 pmc
->tomb
= dpsf
->sf_next
;
1655 psf
->sf_crcount
= qrv
;
1658 } else if (psf
->sf_oldin
) {
1660 psf
->sf_crcount
= 0;
1662 * add or update "delete" records if an active filter
1665 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
)
1666 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1669 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1673 /* pmc->lock held by callers */
1674 dpsf
->sf_next
= pmc
->tomb
;
1677 dpsf
->sf_crcount
= qrv
;
1686 * Add multicast source filter list to the interface list
1688 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1689 int sfcount
, __be32
*psfsrc
, int delta
)
1691 struct ip_mc_list
*pmc
;
1698 for_each_pmc_rcu(in_dev
, pmc
) {
1699 if (*pmca
== pmc
->multiaddr
)
1703 /* MCA not found?? bug */
1707 spin_lock_bh(&pmc
->lock
);
1710 #ifdef CONFIG_IP_MULTICAST
1713 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
1715 pmc
->sfcount
[sfmode
]++;
1717 for (i
=0; i
<sfcount
; i
++) {
1718 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
], delta
);
1725 pmc
->sfcount
[sfmode
]--;
1727 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1728 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
1729 #ifdef CONFIG_IP_MULTICAST
1730 struct ip_sf_list
*psf
;
1731 in_dev
= pmc
->interface
;
1734 /* filter mode change */
1735 if (pmc
->sfcount
[MCAST_EXCLUDE
])
1736 pmc
->sfmode
= MCAST_EXCLUDE
;
1737 else if (pmc
->sfcount
[MCAST_INCLUDE
])
1738 pmc
->sfmode
= MCAST_INCLUDE
;
1739 #ifdef CONFIG_IP_MULTICAST
1740 /* else no filters; keep old mode for reports */
1742 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1743 IGMP_Unsolicited_Report_Count
;
1744 in_dev
->mr_ifc_count
= pmc
->crcount
;
1745 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1746 psf
->sf_crcount
= 0;
1747 igmp_ifc_event(in_dev
);
1748 } else if (sf_setstate(pmc
)) {
1749 igmp_ifc_event(in_dev
);
1752 spin_unlock_bh(&pmc
->lock
);
1756 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
1758 struct ip_sf_list
*psf
, *nextpsf
;
1760 for (psf
=pmc
->tomb
; psf
; psf
=nextpsf
) {
1761 nextpsf
= psf
->sf_next
;
1765 for (psf
=pmc
->sources
; psf
; psf
=nextpsf
) {
1766 nextpsf
= psf
->sf_next
;
1769 pmc
->sources
= NULL
;
1770 pmc
->sfmode
= MCAST_EXCLUDE
;
1771 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
1772 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
1777 * Join a multicast group
1779 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1782 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
1783 struct ip_mc_socklist
*iml
= NULL
, *i
;
1784 struct in_device
*in_dev
;
1785 struct inet_sock
*inet
= inet_sk(sk
);
1786 struct net
*net
= sock_net(sk
);
1790 if (!ipv4_is_multicast(addr
))
1795 in_dev
= ip_mc_find_dev(net
, imr
);
1804 ifindex
= imr
->imr_ifindex
;
1805 for_each_pmc_rtnl(inet
, i
) {
1806 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
1807 i
->multi
.imr_ifindex
== ifindex
)
1812 if (count
>= sysctl_igmp_max_memberships
)
1814 iml
= sock_kmalloc(sk
, sizeof(*iml
), GFP_KERNEL
);
1818 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
1819 iml
->next_rcu
= inet
->mc_list
;
1821 iml
->sfmode
= MCAST_EXCLUDE
;
1822 rcu_assign_pointer(inet
->mc_list
, iml
);
1823 ip_mc_inc_group(in_dev
, addr
);
1829 EXPORT_SYMBOL(ip_mc_join_group
);
1831 static void ip_sf_socklist_reclaim(struct rcu_head
*rp
)
1833 kfree(container_of(rp
, struct ip_sf_socklist
, rcu
));
1834 /* sk_omem_alloc should have been decreased by the caller*/
1837 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
1838 struct in_device
*in_dev
)
1840 struct ip_sf_socklist
*psf
= rtnl_dereference(iml
->sflist
);
1844 /* any-source empty exclude case */
1845 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1846 iml
->sfmode
, 0, NULL
, 0);
1848 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1849 iml
->sfmode
, psf
->sl_count
, psf
->sl_addr
, 0);
1850 rcu_assign_pointer(iml
->sflist
, NULL
);
1851 /* decrease mem now to avoid the memleak warning */
1852 atomic_sub(IP_SFLSIZE(psf
->sl_max
), &sk
->sk_omem_alloc
);
1853 call_rcu(&psf
->rcu
, ip_sf_socklist_reclaim
);
1858 static void ip_mc_socklist_reclaim(struct rcu_head
*rp
)
1860 kfree(container_of(rp
, struct ip_mc_socklist
, rcu
));
1861 /* sk_omem_alloc should have been decreased by the caller*/
1866 * Ask a socket to leave a group.
1869 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1871 struct inet_sock
*inet
= inet_sk(sk
);
1872 struct ip_mc_socklist
*iml
;
1873 struct ip_mc_socklist __rcu
**imlp
;
1874 struct in_device
*in_dev
;
1875 struct net
*net
= sock_net(sk
);
1876 __be32 group
= imr
->imr_multiaddr
.s_addr
;
1878 int ret
= -EADDRNOTAVAIL
;
1881 in_dev
= ip_mc_find_dev(net
, imr
);
1882 ifindex
= imr
->imr_ifindex
;
1883 for (imlp
= &inet
->mc_list
;
1884 (iml
= rtnl_dereference(*imlp
)) != NULL
;
1885 imlp
= &iml
->next_rcu
) {
1886 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
1889 if (iml
->multi
.imr_ifindex
!= ifindex
)
1891 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
1892 iml
->multi
.imr_address
.s_addr
)
1895 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
1897 *imlp
= iml
->next_rcu
;
1900 ip_mc_dec_group(in_dev
, group
);
1902 /* decrease mem now to avoid the memleak warning */
1903 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
1904 call_rcu(&iml
->rcu
, ip_mc_socklist_reclaim
);
1913 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
1914 ip_mreq_source
*mreqs
, int ifindex
)
1917 struct ip_mreqn imr
;
1918 __be32 addr
= mreqs
->imr_multiaddr
;
1919 struct ip_mc_socklist
*pmc
;
1920 struct in_device
*in_dev
= NULL
;
1921 struct inet_sock
*inet
= inet_sk(sk
);
1922 struct ip_sf_socklist
*psl
;
1923 struct net
*net
= sock_net(sk
);
1927 if (!ipv4_is_multicast(addr
))
1932 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
1933 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
1934 imr
.imr_ifindex
= ifindex
;
1935 in_dev
= ip_mc_find_dev(net
, &imr
);
1941 err
= -EADDRNOTAVAIL
;
1943 for_each_pmc_rtnl(inet
, pmc
) {
1944 if ((pmc
->multi
.imr_multiaddr
.s_addr
==
1945 imr
.imr_multiaddr
.s_addr
) &&
1946 (pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
))
1949 if (!pmc
) { /* must have a prior join */
1953 /* if a source filter was set, must be the same mode as before */
1955 if (pmc
->sfmode
!= omode
) {
1959 } else if (pmc
->sfmode
!= omode
) {
1960 /* allow mode switches for empty-set filters */
1961 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
1962 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
1964 pmc
->sfmode
= omode
;
1967 psl
= rtnl_dereference(pmc
->sflist
);
1970 goto done
; /* err = -EADDRNOTAVAIL */
1972 for (i
=0; i
<psl
->sl_count
; i
++) {
1973 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
1978 if (rv
) /* source not found */
1979 goto done
; /* err = -EADDRNOTAVAIL */
1981 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1982 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
1987 /* update the interface filter */
1988 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
1989 &mreqs
->imr_sourceaddr
, 1);
1991 for (j
=i
+1; j
<psl
->sl_count
; j
++)
1992 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
1997 /* else, add a new source to the filter */
1999 if (psl
&& psl
->sl_count
>= sysctl_igmp_max_msf
) {
2003 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
2004 struct ip_sf_socklist
*newpsl
;
2005 int count
= IP_SFBLOCK
;
2008 count
+= psl
->sl_max
;
2009 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
2014 newpsl
->sl_max
= count
;
2015 newpsl
->sl_count
= count
- IP_SFBLOCK
;
2017 for (i
=0; i
<psl
->sl_count
; i
++)
2018 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
2019 /* decrease mem now to avoid the memleak warning */
2020 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2021 call_rcu(&psl
->rcu
, ip_sf_socklist_reclaim
);
2023 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2026 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
2027 for (i
=0; i
<psl
->sl_count
; i
++) {
2028 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2033 if (rv
== 0) /* address already there is an error */
2035 for (j
=psl
->sl_count
-1; j
>=i
; j
--)
2036 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
2037 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
2040 /* update the interface list */
2041 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2042 &mreqs
->imr_sourceaddr
, 1);
2046 return ip_mc_leave_group(sk
, &imr
);
2050 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
2053 struct ip_mreqn imr
;
2054 __be32 addr
= msf
->imsf_multiaddr
;
2055 struct ip_mc_socklist
*pmc
;
2056 struct in_device
*in_dev
;
2057 struct inet_sock
*inet
= inet_sk(sk
);
2058 struct ip_sf_socklist
*newpsl
, *psl
;
2059 struct net
*net
= sock_net(sk
);
2062 if (!ipv4_is_multicast(addr
))
2064 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2065 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2070 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2071 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2072 imr
.imr_ifindex
= ifindex
;
2073 in_dev
= ip_mc_find_dev(net
, &imr
);
2080 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2081 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2086 for_each_pmc_rtnl(inet
, pmc
) {
2087 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2088 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2091 if (!pmc
) { /* must have a prior join */
2095 if (msf
->imsf_numsrc
) {
2096 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2102 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2103 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2104 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2105 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2106 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2108 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2113 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2114 msf
->imsf_fmode
, 0, NULL
, 0);
2116 psl
= rtnl_dereference(pmc
->sflist
);
2118 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2119 psl
->sl_count
, psl
->sl_addr
, 0);
2120 /* decrease mem now to avoid the memleak warning */
2121 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2122 call_rcu(&psl
->rcu
, ip_sf_socklist_reclaim
);
2124 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2126 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2127 pmc
->sfmode
= msf
->imsf_fmode
;
2132 err
= ip_mc_leave_group(sk
, &imr
);
2136 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2137 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2139 int err
, len
, count
, copycount
;
2140 struct ip_mreqn imr
;
2141 __be32 addr
= msf
->imsf_multiaddr
;
2142 struct ip_mc_socklist
*pmc
;
2143 struct in_device
*in_dev
;
2144 struct inet_sock
*inet
= inet_sk(sk
);
2145 struct ip_sf_socklist
*psl
;
2146 struct net
*net
= sock_net(sk
);
2148 if (!ipv4_is_multicast(addr
))
2153 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2154 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2155 imr
.imr_ifindex
= 0;
2156 in_dev
= ip_mc_find_dev(net
, &imr
);
2162 err
= -EADDRNOTAVAIL
;
2164 for_each_pmc_rtnl(inet
, pmc
) {
2165 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2166 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2169 if (!pmc
) /* must have a prior join */
2171 msf
->imsf_fmode
= pmc
->sfmode
;
2172 psl
= rtnl_dereference(pmc
->sflist
);
2178 count
= psl
->sl_count
;
2180 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2181 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2182 msf
->imsf_numsrc
= count
;
2183 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2184 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2188 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2196 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2197 struct group_filter __user
*optval
, int __user
*optlen
)
2199 int err
, i
, count
, copycount
;
2200 struct sockaddr_in
*psin
;
2202 struct ip_mc_socklist
*pmc
;
2203 struct inet_sock
*inet
= inet_sk(sk
);
2204 struct ip_sf_socklist
*psl
;
2206 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2207 if (psin
->sin_family
!= AF_INET
)
2209 addr
= psin
->sin_addr
.s_addr
;
2210 if (!ipv4_is_multicast(addr
))
2215 err
= -EADDRNOTAVAIL
;
2217 for_each_pmc_rtnl(inet
, pmc
) {
2218 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2219 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2222 if (!pmc
) /* must have a prior join */
2224 gsf
->gf_fmode
= pmc
->sfmode
;
2225 psl
= rtnl_dereference(pmc
->sflist
);
2227 count
= psl
? psl
->sl_count
: 0;
2228 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2229 gsf
->gf_numsrc
= count
;
2230 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2231 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2234 for (i
=0; i
<copycount
; i
++) {
2235 struct sockaddr_storage ss
;
2237 psin
= (struct sockaddr_in
*)&ss
;
2238 memset(&ss
, 0, sizeof(ss
));
2239 psin
->sin_family
= AF_INET
;
2240 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2241 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2251 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2253 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2255 struct inet_sock
*inet
= inet_sk(sk
);
2256 struct ip_mc_socklist
*pmc
;
2257 struct ip_sf_socklist
*psl
;
2262 if (!ipv4_is_multicast(loc_addr
))
2266 for_each_pmc_rcu(inet
, pmc
) {
2267 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2268 pmc
->multi
.imr_ifindex
== dif
)
2274 psl
= rcu_dereference(pmc
->sflist
);
2275 ret
= (pmc
->sfmode
== MCAST_EXCLUDE
);
2279 for (i
=0; i
<psl
->sl_count
; i
++) {
2280 if (psl
->sl_addr
[i
] == rmt_addr
)
2284 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2286 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2296 * A socket is closing.
2299 void ip_mc_drop_socket(struct sock
*sk
)
2301 struct inet_sock
*inet
= inet_sk(sk
);
2302 struct ip_mc_socklist
*iml
;
2303 struct net
*net
= sock_net(sk
);
2305 if (inet
->mc_list
== NULL
)
2309 while ((iml
= rtnl_dereference(inet
->mc_list
)) != NULL
) {
2310 struct in_device
*in_dev
;
2312 inet
->mc_list
= iml
->next_rcu
;
2313 in_dev
= inetdev_by_index(net
, iml
->multi
.imr_ifindex
);
2314 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2316 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2317 /* decrease mem now to avoid the memleak warning */
2318 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2319 call_rcu(&iml
->rcu
, ip_mc_socklist_reclaim
);
2324 /* called with rcu_read_lock() */
2325 int ip_check_mc_rcu(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u16 proto
)
2327 struct ip_mc_list
*im
;
2328 struct ip_sf_list
*psf
;
2331 for_each_pmc_rcu(in_dev
, im
) {
2332 if (im
->multiaddr
== mc_addr
)
2335 if (im
&& proto
== IPPROTO_IGMP
) {
2339 for (psf
=im
->sources
; psf
; psf
=psf
->sf_next
) {
2340 if (psf
->sf_inaddr
== src_addr
)
2344 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2345 psf
->sf_count
[MCAST_EXCLUDE
] !=
2346 im
->sfcount
[MCAST_EXCLUDE
];
2348 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2350 rv
= 1; /* unspecified source; tentatively allow */
2355 #if defined(CONFIG_PROC_FS)
2356 struct igmp_mc_iter_state
{
2357 struct seq_net_private p
;
2358 struct net_device
*dev
;
2359 struct in_device
*in_dev
;
2362 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2364 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2366 struct net
*net
= seq_file_net(seq
);
2367 struct ip_mc_list
*im
= NULL
;
2368 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2370 state
->in_dev
= NULL
;
2371 for_each_netdev_rcu(net
, state
->dev
) {
2372 struct in_device
*in_dev
;
2374 in_dev
= __in_dev_get_rcu(state
->dev
);
2377 im
= rcu_dereference(in_dev
->mc_list
);
2379 state
->in_dev
= in_dev
;
2386 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2388 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2390 im
= rcu_dereference(im
->next_rcu
);
2392 state
->dev
= next_net_device_rcu(state
->dev
);
2394 state
->in_dev
= NULL
;
2397 state
->in_dev
= __in_dev_get_rcu(state
->dev
);
2400 im
= rcu_dereference(state
->in_dev
->mc_list
);
2405 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2407 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2409 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2411 return pos
? NULL
: im
;
2414 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2418 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2421 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2423 struct ip_mc_list
*im
;
2424 if (v
== SEQ_START_TOKEN
)
2425 im
= igmp_mc_get_first(seq
);
2427 im
= igmp_mc_get_next(seq
, v
);
2432 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2435 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2437 state
->in_dev
= NULL
;
2442 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2444 if (v
== SEQ_START_TOKEN
)
2446 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2448 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2449 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2451 #ifdef CONFIG_IP_MULTICAST
2452 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2453 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2459 if (rcu_dereference(state
->in_dev
->mc_list
) == im
) {
2460 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2461 state
->dev
->ifindex
, state
->dev
->name
, state
->in_dev
->mc_count
, querier
);
2465 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2466 im
->multiaddr
, im
->users
,
2467 im
->tm_running
, im
->tm_running
?
2468 jiffies_to_clock_t(im
->timer
.expires
-jiffies
) : 0,
2474 static const struct seq_operations igmp_mc_seq_ops
= {
2475 .start
= igmp_mc_seq_start
,
2476 .next
= igmp_mc_seq_next
,
2477 .stop
= igmp_mc_seq_stop
,
2478 .show
= igmp_mc_seq_show
,
2481 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2483 return seq_open_net(inode
, file
, &igmp_mc_seq_ops
,
2484 sizeof(struct igmp_mc_iter_state
));
2487 static const struct file_operations igmp_mc_seq_fops
= {
2488 .owner
= THIS_MODULE
,
2489 .open
= igmp_mc_seq_open
,
2491 .llseek
= seq_lseek
,
2492 .release
= seq_release_net
,
2495 struct igmp_mcf_iter_state
{
2496 struct seq_net_private p
;
2497 struct net_device
*dev
;
2498 struct in_device
*idev
;
2499 struct ip_mc_list
*im
;
2502 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2504 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2506 struct net
*net
= seq_file_net(seq
);
2507 struct ip_sf_list
*psf
= NULL
;
2508 struct ip_mc_list
*im
= NULL
;
2509 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2513 for_each_netdev_rcu(net
, state
->dev
) {
2514 struct in_device
*idev
;
2515 idev
= __in_dev_get_rcu(state
->dev
);
2516 if (unlikely(idev
== NULL
))
2518 im
= rcu_dereference(idev
->mc_list
);
2519 if (likely(im
!= NULL
)) {
2520 spin_lock_bh(&im
->lock
);
2522 if (likely(psf
!= NULL
)) {
2527 spin_unlock_bh(&im
->lock
);
2533 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2535 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2539 spin_unlock_bh(&state
->im
->lock
);
2540 state
->im
= state
->im
->next
;
2541 while (!state
->im
) {
2542 state
->dev
= next_net_device_rcu(state
->dev
);
2547 state
->idev
= __in_dev_get_rcu(state
->dev
);
2550 state
->im
= rcu_dereference(state
->idev
->mc_list
);
2554 spin_lock_bh(&state
->im
->lock
);
2555 psf
= state
->im
->sources
;
2561 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2563 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2565 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2567 return pos
? NULL
: psf
;
2570 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2574 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2577 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2579 struct ip_sf_list
*psf
;
2580 if (v
== SEQ_START_TOKEN
)
2581 psf
= igmp_mcf_get_first(seq
);
2583 psf
= igmp_mcf_get_next(seq
, v
);
2588 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2591 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2592 if (likely(state
->im
!= NULL
)) {
2593 spin_unlock_bh(&state
->im
->lock
);
2601 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2603 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2604 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2606 if (v
== SEQ_START_TOKEN
) {
2609 "%10s %10s %6s %6s\n", "Idx",
2611 "SRC", "INC", "EXC");
2615 "0x%08x %6lu %6lu\n",
2616 state
->dev
->ifindex
, state
->dev
->name
,
2617 ntohl(state
->im
->multiaddr
),
2618 ntohl(psf
->sf_inaddr
),
2619 psf
->sf_count
[MCAST_INCLUDE
],
2620 psf
->sf_count
[MCAST_EXCLUDE
]);
2625 static const struct seq_operations igmp_mcf_seq_ops
= {
2626 .start
= igmp_mcf_seq_start
,
2627 .next
= igmp_mcf_seq_next
,
2628 .stop
= igmp_mcf_seq_stop
,
2629 .show
= igmp_mcf_seq_show
,
2632 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2634 return seq_open_net(inode
, file
, &igmp_mcf_seq_ops
,
2635 sizeof(struct igmp_mcf_iter_state
));
2638 static const struct file_operations igmp_mcf_seq_fops
= {
2639 .owner
= THIS_MODULE
,
2640 .open
= igmp_mcf_seq_open
,
2642 .llseek
= seq_lseek
,
2643 .release
= seq_release_net
,
2646 static int __net_init
igmp_net_init(struct net
*net
)
2648 struct proc_dir_entry
*pde
;
2650 pde
= proc_net_fops_create(net
, "igmp", S_IRUGO
, &igmp_mc_seq_fops
);
2653 pde
= proc_net_fops_create(net
, "mcfilter", S_IRUGO
, &igmp_mcf_seq_fops
);
2659 proc_net_remove(net
, "igmp");
2664 static void __net_exit
igmp_net_exit(struct net
*net
)
2666 proc_net_remove(net
, "mcfilter");
2667 proc_net_remove(net
, "igmp");
2670 static struct pernet_operations igmp_net_ops
= {
2671 .init
= igmp_net_init
,
2672 .exit
= igmp_net_exit
,
2675 int __init
igmp_mc_proc_init(void)
2677 return register_pernet_subsys(&igmp_net_ops
);