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
);
314 skb
= alloc_skb(size
+ LL_ALLOCATED_SPACE(dev
),
315 GFP_ATOMIC
| __GFP_NOWARN
);
322 igmp_skb_size(skb
) = size
;
325 struct flowi fl
= { .oif
= dev
->ifindex
,
326 .fl4_dst
= IGMPV3_ALL_MCR
,
327 .proto
= IPPROTO_IGMP
};
328 rt
= ip_route_output_key(net
, &fl
);
334 if (rt
->rt_src
== 0) {
340 skb_dst_set(skb
, &rt
->dst
);
343 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
345 skb_reset_network_header(skb
);
347 skb_put(skb
, sizeof(struct iphdr
) + 4);
350 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
352 pip
->frag_off
= htons(IP_DF
);
354 pip
->daddr
= rt
->rt_dst
;
355 pip
->saddr
= rt
->rt_src
;
356 pip
->protocol
= IPPROTO_IGMP
;
357 pip
->tot_len
= 0; /* filled in later */
358 ip_select_ident(pip
, &rt
->dst
, NULL
);
359 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
360 ((u8
*)&pip
[1])[1] = 4;
361 ((u8
*)&pip
[1])[2] = 0;
362 ((u8
*)&pip
[1])[3] = 0;
364 skb
->transport_header
= skb
->network_header
+ sizeof(struct iphdr
) + 4;
365 skb_put(skb
, sizeof(*pig
));
366 pig
= igmpv3_report_hdr(skb
);
367 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
375 static int igmpv3_sendpack(struct sk_buff
*skb
)
377 struct igmphdr
*pig
= igmp_hdr(skb
);
378 const int igmplen
= skb
->tail
- skb
->transport_header
;
380 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
382 return ip_local_out(skb
);
385 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
387 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
, type
, gdel
, sdel
);
390 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
391 int type
, struct igmpv3_grec
**ppgr
)
393 struct net_device
*dev
= pmc
->interface
->dev
;
394 struct igmpv3_report
*pih
;
395 struct igmpv3_grec
*pgr
;
398 skb
= igmpv3_newpack(dev
, dev
->mtu
);
401 pgr
= (struct igmpv3_grec
*)skb_put(skb
, sizeof(struct igmpv3_grec
));
402 pgr
->grec_type
= type
;
403 pgr
->grec_auxwords
= 0;
405 pgr
->grec_mca
= pmc
->multiaddr
;
406 pih
= igmpv3_report_hdr(skb
);
407 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
412 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
413 skb_tailroom(skb)) : 0)
415 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
416 int type
, int gdeleted
, int sdeleted
)
418 struct net_device
*dev
= pmc
->interface
->dev
;
419 struct igmpv3_report
*pih
;
420 struct igmpv3_grec
*pgr
= NULL
;
421 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
422 int scount
, stotal
, first
, isquery
, truncate
;
424 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
427 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
428 type
== IGMPV3_MODE_IS_EXCLUDE
;
429 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
430 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
434 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
439 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
441 /* EX and TO_EX get a fresh packet, if needed */
443 if (pih
&& pih
->ngrec
&&
444 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
446 igmpv3_sendpack(skb
);
447 skb
= igmpv3_newpack(dev
, dev
->mtu
);
452 for (psf
=*psf_list
; psf
; psf
=psf_next
) {
455 psf_next
= psf
->sf_next
;
457 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
462 /* clear marks on query responses */
466 if (AVAILABLE(skb
) < sizeof(__be32
) +
467 first
*sizeof(struct igmpv3_grec
)) {
468 if (truncate
&& !first
)
469 break; /* truncate these */
471 pgr
->grec_nsrcs
= htons(scount
);
473 igmpv3_sendpack(skb
);
474 skb
= igmpv3_newpack(dev
, dev
->mtu
);
479 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
484 psrc
= (__be32
*)skb_put(skb
, sizeof(__be32
));
485 *psrc
= psf
->sf_inaddr
;
487 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
488 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
490 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
492 psf_prev
->sf_next
= psf
->sf_next
;
494 *psf_list
= psf
->sf_next
;
504 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
505 type
== IGMPV3_BLOCK_OLD_SOURCES
)
507 if (pmc
->crcount
|| isquery
) {
508 /* make sure we have room for group header */
509 if (skb
&& AVAILABLE(skb
)<sizeof(struct igmpv3_grec
)) {
510 igmpv3_sendpack(skb
);
511 skb
= NULL
; /* add_grhead will get a new one */
513 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
517 pgr
->grec_nsrcs
= htons(scount
);
520 pmc
->gsquery
= 0; /* clear query state on report */
524 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
526 struct sk_buff
*skb
= NULL
;
531 for_each_pmc_rcu(in_dev
, pmc
) {
532 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
534 spin_lock_bh(&pmc
->lock
);
535 if (pmc
->sfcount
[MCAST_EXCLUDE
])
536 type
= IGMPV3_MODE_IS_EXCLUDE
;
538 type
= IGMPV3_MODE_IS_INCLUDE
;
539 skb
= add_grec(skb
, pmc
, type
, 0, 0);
540 spin_unlock_bh(&pmc
->lock
);
544 spin_lock_bh(&pmc
->lock
);
545 if (pmc
->sfcount
[MCAST_EXCLUDE
])
546 type
= IGMPV3_MODE_IS_EXCLUDE
;
548 type
= IGMPV3_MODE_IS_INCLUDE
;
549 skb
= add_grec(skb
, pmc
, type
, 0, 0);
550 spin_unlock_bh(&pmc
->lock
);
554 return igmpv3_sendpack(skb
);
558 * remove zero-count source records from a source filter list
560 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
562 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
565 for (psf
=*ppsf
; psf
; psf
= psf_next
) {
566 psf_next
= psf
->sf_next
;
567 if (psf
->sf_crcount
== 0) {
569 psf_prev
->sf_next
= psf
->sf_next
;
571 *ppsf
= psf
->sf_next
;
578 static void igmpv3_send_cr(struct in_device
*in_dev
)
580 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
581 struct sk_buff
*skb
= NULL
;
585 spin_lock_bh(&in_dev
->mc_tomb_lock
);
589 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc_next
) {
590 pmc_next
= pmc
->next
;
591 if (pmc
->sfmode
== MCAST_INCLUDE
) {
592 type
= IGMPV3_BLOCK_OLD_SOURCES
;
593 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
594 skb
= add_grec(skb
, pmc
, type
, 1, 0);
595 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
598 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
599 type
= IGMPV3_CHANGE_TO_INCLUDE
;
600 skb
= add_grec(skb
, pmc
, type
, 1, 0);
603 if (pmc
->crcount
== 0) {
604 igmpv3_clear_zeros(&pmc
->tomb
);
605 igmpv3_clear_zeros(&pmc
->sources
);
608 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
610 pmc_prev
->next
= pmc_next
;
612 in_dev
->mc_tomb
= pmc_next
;
613 in_dev_put(pmc
->interface
);
618 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
621 for_each_pmc_rcu(in_dev
, pmc
) {
622 spin_lock_bh(&pmc
->lock
);
623 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
624 type
= IGMPV3_BLOCK_OLD_SOURCES
;
625 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
627 type
= IGMPV3_ALLOW_NEW_SOURCES
;
628 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
630 skb
= add_grec(skb
, pmc
, type
, 0, 0);
631 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
633 /* filter mode changes */
635 if (pmc
->sfmode
== MCAST_EXCLUDE
)
636 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
638 type
= IGMPV3_CHANGE_TO_INCLUDE
;
639 skb
= add_grec(skb
, pmc
, type
, 0, 0);
642 spin_unlock_bh(&pmc
->lock
);
648 (void) igmpv3_sendpack(skb
);
651 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
658 struct net_device
*dev
= in_dev
->dev
;
659 struct net
*net
= dev_net(dev
);
660 __be32 group
= pmc
? pmc
->multiaddr
: 0;
663 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
664 return igmpv3_send_report(in_dev
, pmc
);
665 else if (type
== IGMP_HOST_LEAVE_MESSAGE
)
666 dst
= IGMP_ALL_ROUTER
;
671 struct flowi fl
= { .oif
= dev
->ifindex
,
673 .proto
= IPPROTO_IGMP
};
674 rt
= ip_route_output_key(net
, &fl
);
678 if (rt
->rt_src
== 0) {
683 skb
= alloc_skb(IGMP_SIZE
+LL_ALLOCATED_SPACE(dev
), GFP_ATOMIC
);
689 skb_dst_set(skb
, &rt
->dst
);
691 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
693 skb_reset_network_header(skb
);
695 skb_put(skb
, sizeof(struct iphdr
) + 4);
698 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
700 iph
->frag_off
= htons(IP_DF
);
703 iph
->saddr
= rt
->rt_src
;
704 iph
->protocol
= IPPROTO_IGMP
;
705 ip_select_ident(iph
, &rt
->dst
, NULL
);
706 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
707 ((u8
*)&iph
[1])[1] = 4;
708 ((u8
*)&iph
[1])[2] = 0;
709 ((u8
*)&iph
[1])[3] = 0;
711 ih
= (struct igmphdr
*)skb_put(skb
, sizeof(struct igmphdr
));
716 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
718 return ip_local_out(skb
);
721 static void igmp_gq_timer_expire(unsigned long data
)
723 struct in_device
*in_dev
= (struct in_device
*)data
;
725 in_dev
->mr_gq_running
= 0;
726 igmpv3_send_report(in_dev
, NULL
);
727 __in_dev_put(in_dev
);
730 static void igmp_ifc_timer_expire(unsigned long data
)
732 struct in_device
*in_dev
= (struct in_device
*)data
;
734 igmpv3_send_cr(in_dev
);
735 if (in_dev
->mr_ifc_count
) {
736 in_dev
->mr_ifc_count
--;
737 igmp_ifc_start_timer(in_dev
, IGMP_Unsolicited_Report_Interval
);
739 __in_dev_put(in_dev
);
742 static void igmp_ifc_event(struct in_device
*in_dev
)
744 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
746 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
747 IGMP_Unsolicited_Report_Count
;
748 igmp_ifc_start_timer(in_dev
, 1);
752 static void igmp_timer_expire(unsigned long data
)
754 struct ip_mc_list
*im
=(struct ip_mc_list
*)data
;
755 struct in_device
*in_dev
= im
->interface
;
757 spin_lock(&im
->lock
);
760 if (im
->unsolicit_count
) {
761 im
->unsolicit_count
--;
762 igmp_start_timer(im
, IGMP_Unsolicited_Report_Interval
);
765 spin_unlock(&im
->lock
);
767 if (IGMP_V1_SEEN(in_dev
))
768 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
769 else if (IGMP_V2_SEEN(in_dev
))
770 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
772 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
777 /* mark EXCLUDE-mode sources */
778 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
780 struct ip_sf_list
*psf
;
784 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
787 for (i
=0; i
<nsrcs
; i
++) {
788 /* skip inactive filters */
789 if (pmc
->sfcount
[MCAST_INCLUDE
] ||
790 pmc
->sfcount
[MCAST_EXCLUDE
] !=
791 psf
->sf_count
[MCAST_EXCLUDE
])
793 if (srcs
[i
] == psf
->sf_inaddr
) {
800 if (scount
== nsrcs
) /* all sources excluded */
805 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
807 struct ip_sf_list
*psf
;
810 if (pmc
->sfmode
== MCAST_EXCLUDE
)
811 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
813 /* mark INCLUDE-mode sources */
815 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
818 for (i
=0; i
<nsrcs
; i
++)
819 if (srcs
[i
] == psf
->sf_inaddr
) {
833 static void igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
835 struct ip_mc_list
*im
;
837 /* Timers are only set for non-local groups */
839 if (group
== IGMP_ALL_HOSTS
)
843 for_each_pmc_rcu(in_dev
, im
) {
844 if (im
->multiaddr
== group
) {
852 static void igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
855 struct igmphdr
*ih
= igmp_hdr(skb
);
856 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
857 struct ip_mc_list
*im
;
858 __be32 group
= ih
->group
;
865 /* Alas, old v1 router presents here. */
867 max_delay
= IGMP_Query_Response_Interval
;
868 in_dev
->mr_v1_seen
= jiffies
+
869 IGMP_V1_Router_Present_Timeout
;
872 /* v2 router present */
873 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
874 in_dev
->mr_v2_seen
= jiffies
+
875 IGMP_V2_Router_Present_Timeout
;
877 /* cancel the interface change timer */
878 in_dev
->mr_ifc_count
= 0;
879 if (del_timer(&in_dev
->mr_ifc_timer
))
880 __in_dev_put(in_dev
);
881 /* clear deleted report items */
882 igmpv3_clear_delrec(in_dev
);
883 } else if (len
< 12) {
884 return; /* ignore bogus packet; freed by caller */
885 } else if (IGMP_V1_SEEN(in_dev
)) {
886 /* This is a v3 query with v1 queriers present */
887 max_delay
= IGMP_Query_Response_Interval
;
889 } else if (IGMP_V2_SEEN(in_dev
)) {
890 /* this is a v3 query with v2 queriers present;
891 * Interpretation of the max_delay code is problematic here.
892 * A real v2 host would use ih_code directly, while v3 has a
893 * different encoding. We use the v3 encoding as more likely
894 * to be intended in a v3 query.
896 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
898 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
901 ih3
= igmpv3_query_hdr(skb
);
903 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
904 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
906 ih3
= igmpv3_query_hdr(skb
);
909 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
911 max_delay
= 1; /* can't mod w/ 0 */
912 in_dev
->mr_maxdelay
= max_delay
;
914 in_dev
->mr_qrv
= ih3
->qrv
;
915 if (!group
) { /* general query */
917 return; /* no sources allowed */
918 igmp_gq_start_timer(in_dev
);
921 /* mark sources to include, if group & source-specific */
922 mark
= ih3
->nsrcs
!= 0;
926 * - Start the timers in all of our membership records
927 * that the query applies to for the interface on
928 * which the query arrived excl. those that belong
929 * to a "local" group (224.0.0.X)
930 * - For timers already running check if they need to
932 * - Use the igmp->igmp_code field as the maximum
936 for_each_pmc_rcu(in_dev
, im
) {
939 if (group
&& group
!= im
->multiaddr
)
941 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
943 spin_lock_bh(&im
->lock
);
945 im
->gsquery
= im
->gsquery
&& mark
;
948 changed
= !im
->gsquery
||
949 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
950 spin_unlock_bh(&im
->lock
);
952 igmp_mod_timer(im
, max_delay
);
957 /* called in rcu_read_lock() section */
958 int igmp_rcv(struct sk_buff
*skb
)
960 /* This basically follows the spec line by line -- see RFC1112 */
962 struct in_device
*in_dev
= __in_dev_get_rcu(skb
->dev
);
968 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
971 switch (skb
->ip_summed
) {
972 case CHECKSUM_COMPLETE
:
973 if (!csum_fold(skb
->csum
))
978 if (__skb_checksum_complete(skb
))
984 case IGMP_HOST_MEMBERSHIP_QUERY
:
985 igmp_heard_query(in_dev
, skb
, len
);
987 case IGMP_HOST_MEMBERSHIP_REPORT
:
988 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
989 /* Is it our report looped back? */
990 if (rt_is_output_route(skb_rtable(skb
)))
992 /* don't rely on MC router hearing unicast reports */
993 if (skb
->pkt_type
== PACKET_MULTICAST
||
994 skb
->pkt_type
== PACKET_BROADCAST
)
995 igmp_heard_report(in_dev
, ih
->group
);
998 #ifdef CONFIG_IP_PIMSM_V1
999 return pim_rcv_v1(skb
);
1001 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1004 case IGMP_HOST_LEAVE_MESSAGE
:
1006 case IGMP_MTRACE_RESP
:
1021 * Add a filter to a device
1024 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
1026 char buf
[MAX_ADDR_LEN
];
1027 struct net_device
*dev
= in_dev
->dev
;
1029 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1030 We will get multicast token leakage, when IFF_MULTICAST
1031 is changed. This check should be done in dev->set_multicast_list
1032 routine. Something sort of:
1033 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1036 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1037 dev_mc_add(dev
, buf
);
1041 * Remove a filter from a device
1044 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1046 char buf
[MAX_ADDR_LEN
];
1047 struct net_device
*dev
= in_dev
->dev
;
1049 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1050 dev_mc_del(dev
, buf
);
1053 #ifdef CONFIG_IP_MULTICAST
1055 * deleted ip_mc_list manipulation
1057 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1059 struct ip_mc_list
*pmc
;
1061 /* this is an "ip_mc_list" for convenience; only the fields below
1062 * are actually used. In particular, the refcnt and users are not
1063 * used for management of the delete list. Using the same structure
1064 * for deleted items allows change reports to use common code with
1065 * non-deleted or query-response MCA's.
1067 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1070 spin_lock_bh(&im
->lock
);
1071 pmc
->interface
= im
->interface
;
1072 in_dev_hold(in_dev
);
1073 pmc
->multiaddr
= im
->multiaddr
;
1074 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1075 IGMP_Unsolicited_Report_Count
;
1076 pmc
->sfmode
= im
->sfmode
;
1077 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1078 struct ip_sf_list
*psf
;
1080 pmc
->tomb
= im
->tomb
;
1081 pmc
->sources
= im
->sources
;
1082 im
->tomb
= im
->sources
= NULL
;
1083 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1084 psf
->sf_crcount
= pmc
->crcount
;
1086 spin_unlock_bh(&im
->lock
);
1088 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1089 pmc
->next
= in_dev
->mc_tomb
;
1090 in_dev
->mc_tomb
= pmc
;
1091 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1094 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
)
1096 struct ip_mc_list
*pmc
, *pmc_prev
;
1097 struct ip_sf_list
*psf
, *psf_next
;
1099 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1101 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc
->next
) {
1102 if (pmc
->multiaddr
== multiaddr
)
1108 pmc_prev
->next
= pmc
->next
;
1110 in_dev
->mc_tomb
= pmc
->next
;
1112 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1114 for (psf
=pmc
->tomb
; psf
; psf
=psf_next
) {
1115 psf_next
= psf
->sf_next
;
1118 in_dev_put(pmc
->interface
);
1123 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1125 struct ip_mc_list
*pmc
, *nextpmc
;
1127 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1128 pmc
= in_dev
->mc_tomb
;
1129 in_dev
->mc_tomb
= NULL
;
1130 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1132 for (; pmc
; pmc
= nextpmc
) {
1133 nextpmc
= pmc
->next
;
1134 ip_mc_clear_src(pmc
);
1135 in_dev_put(pmc
->interface
);
1138 /* clear dead sources, too */
1140 for_each_pmc_rcu(in_dev
, pmc
) {
1141 struct ip_sf_list
*psf
, *psf_next
;
1143 spin_lock_bh(&pmc
->lock
);
1146 spin_unlock_bh(&pmc
->lock
);
1147 for (; psf
; psf
=psf_next
) {
1148 psf_next
= psf
->sf_next
;
1156 static void igmp_group_dropped(struct ip_mc_list
*im
)
1158 struct in_device
*in_dev
= im
->interface
;
1159 #ifdef CONFIG_IP_MULTICAST
1165 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1168 #ifdef CONFIG_IP_MULTICAST
1169 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1172 reporter
= im
->reporter
;
1173 igmp_stop_timer(im
);
1175 if (!in_dev
->dead
) {
1176 if (IGMP_V1_SEEN(in_dev
))
1178 if (IGMP_V2_SEEN(in_dev
)) {
1180 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1184 igmpv3_add_delrec(in_dev
, im
);
1186 igmp_ifc_event(in_dev
);
1190 ip_mc_clear_src(im
);
1193 static void igmp_group_added(struct ip_mc_list
*im
)
1195 struct in_device
*in_dev
= im
->interface
;
1197 if (im
->loaded
== 0) {
1199 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1202 #ifdef CONFIG_IP_MULTICAST
1203 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1208 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1209 spin_lock_bh(&im
->lock
);
1210 igmp_start_timer(im
, IGMP_Initial_Report_Delay
);
1211 spin_unlock_bh(&im
->lock
);
1216 im
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1217 IGMP_Unsolicited_Report_Count
;
1218 igmp_ifc_event(in_dev
);
1224 * Multicast list managers
1229 * A socket has joined a multicast group on device dev.
1232 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1234 struct ip_mc_list
*im
;
1238 for_each_pmc_rtnl(in_dev
, im
) {
1239 if (im
->multiaddr
== addr
) {
1241 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1246 im
= kzalloc(sizeof(*im
), GFP_KERNEL
);
1251 im
->interface
= in_dev
;
1252 in_dev_hold(in_dev
);
1253 im
->multiaddr
= addr
;
1254 /* initial mode is (EX, empty) */
1255 im
->sfmode
= MCAST_EXCLUDE
;
1256 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1257 atomic_set(&im
->refcnt
, 1);
1258 spin_lock_init(&im
->lock
);
1259 #ifdef CONFIG_IP_MULTICAST
1260 setup_timer(&im
->timer
, &igmp_timer_expire
, (unsigned long)im
);
1261 im
->unsolicit_count
= IGMP_Unsolicited_Report_Count
;
1264 im
->next_rcu
= in_dev
->mc_list
;
1266 rcu_assign_pointer(in_dev
->mc_list
, im
);
1268 #ifdef CONFIG_IP_MULTICAST
1269 igmpv3_del_delrec(in_dev
, im
->multiaddr
);
1271 igmp_group_added(im
);
1273 ip_rt_multicast_event(in_dev
);
1277 EXPORT_SYMBOL(ip_mc_inc_group
);
1280 * Resend IGMP JOIN report; used for bonding.
1281 * Called with rcu_read_lock()
1283 void ip_mc_rejoin_groups(struct in_device
*in_dev
)
1285 #ifdef CONFIG_IP_MULTICAST
1286 struct ip_mc_list
*im
;
1289 for_each_pmc_rcu(in_dev
, im
) {
1290 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1293 /* a failover is happening and switches
1294 * must be notified immediately
1296 if (IGMP_V1_SEEN(in_dev
))
1297 type
= IGMP_HOST_MEMBERSHIP_REPORT
;
1298 else if (IGMP_V2_SEEN(in_dev
))
1299 type
= IGMPV2_HOST_MEMBERSHIP_REPORT
;
1301 type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
1302 igmp_send_report(in_dev
, im
, type
);
1306 EXPORT_SYMBOL(ip_mc_rejoin_groups
);
1309 * A socket has left a multicast group on device dev
1312 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1314 struct ip_mc_list
*i
;
1315 struct ip_mc_list __rcu
**ip
;
1319 for (ip
= &in_dev
->mc_list
;
1320 (i
= rtnl_dereference(*ip
)) != NULL
;
1321 ip
= &i
->next_rcu
) {
1322 if (i
->multiaddr
== addr
) {
1323 if (--i
->users
== 0) {
1326 igmp_group_dropped(i
);
1329 ip_rt_multicast_event(in_dev
);
1338 EXPORT_SYMBOL(ip_mc_dec_group
);
1340 /* Device changing type */
1342 void ip_mc_unmap(struct in_device
*in_dev
)
1344 struct ip_mc_list
*pmc
;
1348 for_each_pmc_rtnl(in_dev
, pmc
)
1349 igmp_group_dropped(pmc
);
1352 void ip_mc_remap(struct in_device
*in_dev
)
1354 struct ip_mc_list
*pmc
;
1358 for_each_pmc_rtnl(in_dev
, pmc
)
1359 igmp_group_added(pmc
);
1362 /* Device going down */
1364 void ip_mc_down(struct in_device
*in_dev
)
1366 struct ip_mc_list
*pmc
;
1370 for_each_pmc_rtnl(in_dev
, pmc
)
1371 igmp_group_dropped(pmc
);
1373 #ifdef CONFIG_IP_MULTICAST
1374 in_dev
->mr_ifc_count
= 0;
1375 if (del_timer(&in_dev
->mr_ifc_timer
))
1376 __in_dev_put(in_dev
);
1377 in_dev
->mr_gq_running
= 0;
1378 if (del_timer(&in_dev
->mr_gq_timer
))
1379 __in_dev_put(in_dev
);
1380 igmpv3_clear_delrec(in_dev
);
1383 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1386 void ip_mc_init_dev(struct in_device
*in_dev
)
1390 in_dev
->mc_tomb
= NULL
;
1391 #ifdef CONFIG_IP_MULTICAST
1392 in_dev
->mr_gq_running
= 0;
1393 setup_timer(&in_dev
->mr_gq_timer
, igmp_gq_timer_expire
,
1394 (unsigned long)in_dev
);
1395 in_dev
->mr_ifc_count
= 0;
1396 in_dev
->mc_count
= 0;
1397 setup_timer(&in_dev
->mr_ifc_timer
, igmp_ifc_timer_expire
,
1398 (unsigned long)in_dev
);
1399 in_dev
->mr_qrv
= IGMP_Unsolicited_Report_Count
;
1402 spin_lock_init(&in_dev
->mc_tomb_lock
);
1405 /* Device going up */
1407 void ip_mc_up(struct in_device
*in_dev
)
1409 struct ip_mc_list
*pmc
;
1413 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1415 for_each_pmc_rtnl(in_dev
, pmc
)
1416 igmp_group_added(pmc
);
1420 * Device is about to be destroyed: clean up.
1423 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1425 struct ip_mc_list
*i
;
1429 /* Deactivate timers */
1432 while ((i
= rtnl_dereference(in_dev
->mc_list
)) != NULL
) {
1433 in_dev
->mc_list
= i
->next_rcu
;
1436 igmp_group_dropped(i
);
1441 /* RTNL is locked */
1442 static struct in_device
*ip_mc_find_dev(struct net
*net
, struct ip_mreqn
*imr
)
1444 struct flowi fl
= { .fl4_dst
= imr
->imr_multiaddr
.s_addr
};
1445 struct net_device
*dev
= NULL
;
1446 struct in_device
*idev
= NULL
;
1448 if (imr
->imr_ifindex
) {
1449 idev
= inetdev_by_index(net
, imr
->imr_ifindex
);
1452 if (imr
->imr_address
.s_addr
) {
1453 dev
= __ip_dev_find(net
, imr
->imr_address
.s_addr
, false);
1459 struct rtable
*rt
= ip_route_output_key(net
, &fl
);
1466 imr
->imr_ifindex
= dev
->ifindex
;
1467 idev
= __in_dev_get_rtnl(dev
);
1473 * Join a socket to a group
1475 int sysctl_igmp_max_memberships __read_mostly
= IP_MAX_MEMBERSHIPS
;
1476 int sysctl_igmp_max_msf __read_mostly
= IP_MAX_MSF
;
1479 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1482 struct ip_sf_list
*psf
, *psf_prev
;
1486 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1487 if (psf
->sf_inaddr
== *psfsrc
)
1491 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1492 /* source filter not found, or count wrong => bug */
1495 psf
->sf_count
[sfmode
]--;
1496 if (psf
->sf_count
[sfmode
] == 0) {
1497 ip_rt_multicast_event(pmc
->interface
);
1499 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1500 #ifdef CONFIG_IP_MULTICAST
1501 struct in_device
*in_dev
= pmc
->interface
;
1504 /* no more filters for this source */
1506 psf_prev
->sf_next
= psf
->sf_next
;
1508 pmc
->sources
= psf
->sf_next
;
1509 #ifdef CONFIG_IP_MULTICAST
1510 if (psf
->sf_oldin
&&
1511 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1512 psf
->sf_crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1513 IGMP_Unsolicited_Report_Count
;
1514 psf
->sf_next
= pmc
->tomb
;
1524 #ifndef CONFIG_IP_MULTICAST
1525 #define igmp_ifc_event(x) do { } while (0)
1528 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1529 int sfcount
, __be32
*psfsrc
, int delta
)
1531 struct ip_mc_list
*pmc
;
1538 for_each_pmc_rcu(in_dev
, pmc
) {
1539 if (*pmca
== pmc
->multiaddr
)
1543 /* MCA not found?? bug */
1547 spin_lock_bh(&pmc
->lock
);
1549 #ifdef CONFIG_IP_MULTICAST
1554 if (!pmc
->sfcount
[sfmode
])
1556 pmc
->sfcount
[sfmode
]--;
1559 for (i
=0; i
<sfcount
; i
++) {
1560 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1562 changerec
|= rv
> 0;
1566 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1567 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1568 pmc
->sfcount
[MCAST_INCLUDE
]) {
1569 #ifdef CONFIG_IP_MULTICAST
1570 struct ip_sf_list
*psf
;
1573 /* filter mode change */
1574 pmc
->sfmode
= MCAST_INCLUDE
;
1575 #ifdef CONFIG_IP_MULTICAST
1576 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1577 IGMP_Unsolicited_Report_Count
;
1578 in_dev
->mr_ifc_count
= pmc
->crcount
;
1579 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1580 psf
->sf_crcount
= 0;
1581 igmp_ifc_event(pmc
->interface
);
1582 } else if (sf_setstate(pmc
) || changerec
) {
1583 igmp_ifc_event(pmc
->interface
);
1587 spin_unlock_bh(&pmc
->lock
);
1592 * Add multicast single-source filter to the interface list
1594 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1595 __be32
*psfsrc
, int delta
)
1597 struct ip_sf_list
*psf
, *psf_prev
;
1600 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1601 if (psf
->sf_inaddr
== *psfsrc
)
1606 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1609 psf
->sf_inaddr
= *psfsrc
;
1611 psf_prev
->sf_next
= psf
;
1615 psf
->sf_count
[sfmode
]++;
1616 if (psf
->sf_count
[sfmode
] == 1) {
1617 ip_rt_multicast_event(pmc
->interface
);
1622 #ifdef CONFIG_IP_MULTICAST
1623 static void sf_markstate(struct ip_mc_list
*pmc
)
1625 struct ip_sf_list
*psf
;
1626 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1628 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1629 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1630 psf
->sf_oldin
= mca_xcount
==
1631 psf
->sf_count
[MCAST_EXCLUDE
] &&
1632 !psf
->sf_count
[MCAST_INCLUDE
];
1634 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1637 static int sf_setstate(struct ip_mc_list
*pmc
)
1639 struct ip_sf_list
*psf
, *dpsf
;
1640 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1641 int qrv
= pmc
->interface
->mr_qrv
;
1645 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1646 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1647 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1648 !psf
->sf_count
[MCAST_INCLUDE
];
1650 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1652 if (!psf
->sf_oldin
) {
1653 struct ip_sf_list
*prev
= NULL
;
1655 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
) {
1656 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1662 prev
->sf_next
= dpsf
->sf_next
;
1664 pmc
->tomb
= dpsf
->sf_next
;
1667 psf
->sf_crcount
= qrv
;
1670 } else if (psf
->sf_oldin
) {
1672 psf
->sf_crcount
= 0;
1674 * add or update "delete" records if an active filter
1677 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
)
1678 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1681 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1685 /* pmc->lock held by callers */
1686 dpsf
->sf_next
= pmc
->tomb
;
1689 dpsf
->sf_crcount
= qrv
;
1698 * Add multicast source filter list to the interface list
1700 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1701 int sfcount
, __be32
*psfsrc
, int delta
)
1703 struct ip_mc_list
*pmc
;
1710 for_each_pmc_rcu(in_dev
, pmc
) {
1711 if (*pmca
== pmc
->multiaddr
)
1715 /* MCA not found?? bug */
1719 spin_lock_bh(&pmc
->lock
);
1722 #ifdef CONFIG_IP_MULTICAST
1725 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
1727 pmc
->sfcount
[sfmode
]++;
1729 for (i
=0; i
<sfcount
; i
++) {
1730 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
], delta
);
1737 pmc
->sfcount
[sfmode
]--;
1739 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1740 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
1741 #ifdef CONFIG_IP_MULTICAST
1742 struct ip_sf_list
*psf
;
1743 in_dev
= pmc
->interface
;
1746 /* filter mode change */
1747 if (pmc
->sfcount
[MCAST_EXCLUDE
])
1748 pmc
->sfmode
= MCAST_EXCLUDE
;
1749 else if (pmc
->sfcount
[MCAST_INCLUDE
])
1750 pmc
->sfmode
= MCAST_INCLUDE
;
1751 #ifdef CONFIG_IP_MULTICAST
1752 /* else no filters; keep old mode for reports */
1754 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1755 IGMP_Unsolicited_Report_Count
;
1756 in_dev
->mr_ifc_count
= pmc
->crcount
;
1757 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1758 psf
->sf_crcount
= 0;
1759 igmp_ifc_event(in_dev
);
1760 } else if (sf_setstate(pmc
)) {
1761 igmp_ifc_event(in_dev
);
1764 spin_unlock_bh(&pmc
->lock
);
1768 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
1770 struct ip_sf_list
*psf
, *nextpsf
;
1772 for (psf
=pmc
->tomb
; psf
; psf
=nextpsf
) {
1773 nextpsf
= psf
->sf_next
;
1777 for (psf
=pmc
->sources
; psf
; psf
=nextpsf
) {
1778 nextpsf
= psf
->sf_next
;
1781 pmc
->sources
= NULL
;
1782 pmc
->sfmode
= MCAST_EXCLUDE
;
1783 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
1784 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
1789 * Join a multicast group
1791 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1794 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
1795 struct ip_mc_socklist
*iml
= NULL
, *i
;
1796 struct in_device
*in_dev
;
1797 struct inet_sock
*inet
= inet_sk(sk
);
1798 struct net
*net
= sock_net(sk
);
1802 if (!ipv4_is_multicast(addr
))
1807 in_dev
= ip_mc_find_dev(net
, imr
);
1816 ifindex
= imr
->imr_ifindex
;
1817 for_each_pmc_rtnl(inet
, i
) {
1818 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
1819 i
->multi
.imr_ifindex
== ifindex
)
1824 if (count
>= sysctl_igmp_max_memberships
)
1826 iml
= sock_kmalloc(sk
, sizeof(*iml
), GFP_KERNEL
);
1830 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
1831 iml
->next_rcu
= inet
->mc_list
;
1833 iml
->sfmode
= MCAST_EXCLUDE
;
1834 rcu_assign_pointer(inet
->mc_list
, iml
);
1835 ip_mc_inc_group(in_dev
, addr
);
1841 EXPORT_SYMBOL(ip_mc_join_group
);
1843 static void ip_sf_socklist_reclaim(struct rcu_head
*rp
)
1845 kfree(container_of(rp
, struct ip_sf_socklist
, rcu
));
1846 /* sk_omem_alloc should have been decreased by the caller*/
1849 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
1850 struct in_device
*in_dev
)
1852 struct ip_sf_socklist
*psf
= rtnl_dereference(iml
->sflist
);
1856 /* any-source empty exclude case */
1857 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1858 iml
->sfmode
, 0, NULL
, 0);
1860 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1861 iml
->sfmode
, psf
->sl_count
, psf
->sl_addr
, 0);
1862 rcu_assign_pointer(iml
->sflist
, NULL
);
1863 /* decrease mem now to avoid the memleak warning */
1864 atomic_sub(IP_SFLSIZE(psf
->sl_max
), &sk
->sk_omem_alloc
);
1865 call_rcu(&psf
->rcu
, ip_sf_socklist_reclaim
);
1870 static void ip_mc_socklist_reclaim(struct rcu_head
*rp
)
1872 kfree(container_of(rp
, struct ip_mc_socklist
, rcu
));
1873 /* sk_omem_alloc should have been decreased by the caller*/
1878 * Ask a socket to leave a group.
1881 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1883 struct inet_sock
*inet
= inet_sk(sk
);
1884 struct ip_mc_socklist
*iml
;
1885 struct ip_mc_socklist __rcu
**imlp
;
1886 struct in_device
*in_dev
;
1887 struct net
*net
= sock_net(sk
);
1888 __be32 group
= imr
->imr_multiaddr
.s_addr
;
1890 int ret
= -EADDRNOTAVAIL
;
1893 in_dev
= ip_mc_find_dev(net
, imr
);
1894 ifindex
= imr
->imr_ifindex
;
1895 for (imlp
= &inet
->mc_list
;
1896 (iml
= rtnl_dereference(*imlp
)) != NULL
;
1897 imlp
= &iml
->next_rcu
) {
1898 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
1901 if (iml
->multi
.imr_ifindex
!= ifindex
)
1903 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
1904 iml
->multi
.imr_address
.s_addr
)
1907 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
1909 *imlp
= iml
->next_rcu
;
1912 ip_mc_dec_group(in_dev
, group
);
1914 /* decrease mem now to avoid the memleak warning */
1915 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
1916 call_rcu(&iml
->rcu
, ip_mc_socklist_reclaim
);
1925 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
1926 ip_mreq_source
*mreqs
, int ifindex
)
1929 struct ip_mreqn imr
;
1930 __be32 addr
= mreqs
->imr_multiaddr
;
1931 struct ip_mc_socklist
*pmc
;
1932 struct in_device
*in_dev
= NULL
;
1933 struct inet_sock
*inet
= inet_sk(sk
);
1934 struct ip_sf_socklist
*psl
;
1935 struct net
*net
= sock_net(sk
);
1939 if (!ipv4_is_multicast(addr
))
1944 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
1945 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
1946 imr
.imr_ifindex
= ifindex
;
1947 in_dev
= ip_mc_find_dev(net
, &imr
);
1953 err
= -EADDRNOTAVAIL
;
1955 for_each_pmc_rtnl(inet
, pmc
) {
1956 if ((pmc
->multi
.imr_multiaddr
.s_addr
==
1957 imr
.imr_multiaddr
.s_addr
) &&
1958 (pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
))
1961 if (!pmc
) { /* must have a prior join */
1965 /* if a source filter was set, must be the same mode as before */
1967 if (pmc
->sfmode
!= omode
) {
1971 } else if (pmc
->sfmode
!= omode
) {
1972 /* allow mode switches for empty-set filters */
1973 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
1974 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
1976 pmc
->sfmode
= omode
;
1979 psl
= rtnl_dereference(pmc
->sflist
);
1982 goto done
; /* err = -EADDRNOTAVAIL */
1984 for (i
=0; i
<psl
->sl_count
; i
++) {
1985 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
1990 if (rv
) /* source not found */
1991 goto done
; /* err = -EADDRNOTAVAIL */
1993 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1994 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
1999 /* update the interface filter */
2000 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2001 &mreqs
->imr_sourceaddr
, 1);
2003 for (j
=i
+1; j
<psl
->sl_count
; j
++)
2004 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
2009 /* else, add a new source to the filter */
2011 if (psl
&& psl
->sl_count
>= sysctl_igmp_max_msf
) {
2015 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
2016 struct ip_sf_socklist
*newpsl
;
2017 int count
= IP_SFBLOCK
;
2020 count
+= psl
->sl_max
;
2021 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
2026 newpsl
->sl_max
= count
;
2027 newpsl
->sl_count
= count
- IP_SFBLOCK
;
2029 for (i
=0; i
<psl
->sl_count
; i
++)
2030 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
2031 /* decrease mem now to avoid the memleak warning */
2032 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2033 call_rcu(&psl
->rcu
, ip_sf_socklist_reclaim
);
2035 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2038 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
2039 for (i
=0; i
<psl
->sl_count
; i
++) {
2040 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2045 if (rv
== 0) /* address already there is an error */
2047 for (j
=psl
->sl_count
-1; j
>=i
; j
--)
2048 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
2049 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
2052 /* update the interface list */
2053 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2054 &mreqs
->imr_sourceaddr
, 1);
2058 return ip_mc_leave_group(sk
, &imr
);
2062 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
2065 struct ip_mreqn imr
;
2066 __be32 addr
= msf
->imsf_multiaddr
;
2067 struct ip_mc_socklist
*pmc
;
2068 struct in_device
*in_dev
;
2069 struct inet_sock
*inet
= inet_sk(sk
);
2070 struct ip_sf_socklist
*newpsl
, *psl
;
2071 struct net
*net
= sock_net(sk
);
2074 if (!ipv4_is_multicast(addr
))
2076 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2077 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2082 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2083 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2084 imr
.imr_ifindex
= ifindex
;
2085 in_dev
= ip_mc_find_dev(net
, &imr
);
2092 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2093 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2098 for_each_pmc_rtnl(inet
, pmc
) {
2099 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2100 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2103 if (!pmc
) { /* must have a prior join */
2107 if (msf
->imsf_numsrc
) {
2108 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2114 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2115 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2116 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2117 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2118 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2120 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2125 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2126 msf
->imsf_fmode
, 0, NULL
, 0);
2128 psl
= rtnl_dereference(pmc
->sflist
);
2130 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2131 psl
->sl_count
, psl
->sl_addr
, 0);
2132 /* decrease mem now to avoid the memleak warning */
2133 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2134 call_rcu(&psl
->rcu
, ip_sf_socklist_reclaim
);
2136 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2138 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2139 pmc
->sfmode
= msf
->imsf_fmode
;
2144 err
= ip_mc_leave_group(sk
, &imr
);
2148 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2149 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2151 int err
, len
, count
, copycount
;
2152 struct ip_mreqn imr
;
2153 __be32 addr
= msf
->imsf_multiaddr
;
2154 struct ip_mc_socklist
*pmc
;
2155 struct in_device
*in_dev
;
2156 struct inet_sock
*inet
= inet_sk(sk
);
2157 struct ip_sf_socklist
*psl
;
2158 struct net
*net
= sock_net(sk
);
2160 if (!ipv4_is_multicast(addr
))
2165 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2166 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2167 imr
.imr_ifindex
= 0;
2168 in_dev
= ip_mc_find_dev(net
, &imr
);
2174 err
= -EADDRNOTAVAIL
;
2176 for_each_pmc_rtnl(inet
, pmc
) {
2177 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2178 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2181 if (!pmc
) /* must have a prior join */
2183 msf
->imsf_fmode
= pmc
->sfmode
;
2184 psl
= rtnl_dereference(pmc
->sflist
);
2190 count
= psl
->sl_count
;
2192 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2193 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2194 msf
->imsf_numsrc
= count
;
2195 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2196 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2200 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2208 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2209 struct group_filter __user
*optval
, int __user
*optlen
)
2211 int err
, i
, count
, copycount
;
2212 struct sockaddr_in
*psin
;
2214 struct ip_mc_socklist
*pmc
;
2215 struct inet_sock
*inet
= inet_sk(sk
);
2216 struct ip_sf_socklist
*psl
;
2218 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2219 if (psin
->sin_family
!= AF_INET
)
2221 addr
= psin
->sin_addr
.s_addr
;
2222 if (!ipv4_is_multicast(addr
))
2227 err
= -EADDRNOTAVAIL
;
2229 for_each_pmc_rtnl(inet
, pmc
) {
2230 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2231 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2234 if (!pmc
) /* must have a prior join */
2236 gsf
->gf_fmode
= pmc
->sfmode
;
2237 psl
= rtnl_dereference(pmc
->sflist
);
2239 count
= psl
? psl
->sl_count
: 0;
2240 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2241 gsf
->gf_numsrc
= count
;
2242 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2243 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2246 for (i
=0; i
<copycount
; i
++) {
2247 struct sockaddr_storage ss
;
2249 psin
= (struct sockaddr_in
*)&ss
;
2250 memset(&ss
, 0, sizeof(ss
));
2251 psin
->sin_family
= AF_INET
;
2252 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2253 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2263 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2265 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2267 struct inet_sock
*inet
= inet_sk(sk
);
2268 struct ip_mc_socklist
*pmc
;
2269 struct ip_sf_socklist
*psl
;
2274 if (!ipv4_is_multicast(loc_addr
))
2278 for_each_pmc_rcu(inet
, pmc
) {
2279 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2280 pmc
->multi
.imr_ifindex
== dif
)
2286 psl
= rcu_dereference(pmc
->sflist
);
2287 ret
= (pmc
->sfmode
== MCAST_EXCLUDE
);
2291 for (i
=0; i
<psl
->sl_count
; i
++) {
2292 if (psl
->sl_addr
[i
] == rmt_addr
)
2296 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2298 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2308 * A socket is closing.
2311 void ip_mc_drop_socket(struct sock
*sk
)
2313 struct inet_sock
*inet
= inet_sk(sk
);
2314 struct ip_mc_socklist
*iml
;
2315 struct net
*net
= sock_net(sk
);
2317 if (inet
->mc_list
== NULL
)
2321 while ((iml
= rtnl_dereference(inet
->mc_list
)) != NULL
) {
2322 struct in_device
*in_dev
;
2324 inet
->mc_list
= iml
->next_rcu
;
2325 in_dev
= inetdev_by_index(net
, iml
->multi
.imr_ifindex
);
2326 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2328 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2329 /* decrease mem now to avoid the memleak warning */
2330 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2331 call_rcu(&iml
->rcu
, ip_mc_socklist_reclaim
);
2336 int ip_check_mc(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u16 proto
)
2338 struct ip_mc_list
*im
;
2339 struct ip_sf_list
*psf
;
2343 for_each_pmc_rcu(in_dev
, im
) {
2344 if (im
->multiaddr
== mc_addr
)
2347 if (im
&& proto
== IPPROTO_IGMP
) {
2351 for (psf
=im
->sources
; psf
; psf
=psf
->sf_next
) {
2352 if (psf
->sf_inaddr
== src_addr
)
2356 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2357 psf
->sf_count
[MCAST_EXCLUDE
] !=
2358 im
->sfcount
[MCAST_EXCLUDE
];
2360 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2362 rv
= 1; /* unspecified source; tentatively allow */
2368 #if defined(CONFIG_PROC_FS)
2369 struct igmp_mc_iter_state
{
2370 struct seq_net_private p
;
2371 struct net_device
*dev
;
2372 struct in_device
*in_dev
;
2375 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2377 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2379 struct net
*net
= seq_file_net(seq
);
2380 struct ip_mc_list
*im
= NULL
;
2381 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2383 state
->in_dev
= NULL
;
2384 for_each_netdev_rcu(net
, state
->dev
) {
2385 struct in_device
*in_dev
;
2387 in_dev
= __in_dev_get_rcu(state
->dev
);
2390 im
= rcu_dereference(in_dev
->mc_list
);
2392 state
->in_dev
= in_dev
;
2399 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2401 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2403 im
= rcu_dereference(im
->next_rcu
);
2405 state
->dev
= next_net_device_rcu(state
->dev
);
2407 state
->in_dev
= NULL
;
2410 state
->in_dev
= __in_dev_get_rcu(state
->dev
);
2413 im
= rcu_dereference(state
->in_dev
->mc_list
);
2418 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2420 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2422 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2424 return pos
? NULL
: im
;
2427 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2431 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2434 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2436 struct ip_mc_list
*im
;
2437 if (v
== SEQ_START_TOKEN
)
2438 im
= igmp_mc_get_first(seq
);
2440 im
= igmp_mc_get_next(seq
, v
);
2445 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2448 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2450 state
->in_dev
= NULL
;
2455 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2457 if (v
== SEQ_START_TOKEN
)
2459 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2461 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2462 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2464 #ifdef CONFIG_IP_MULTICAST
2465 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2466 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2472 if (rcu_dereference(state
->in_dev
->mc_list
) == im
) {
2473 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2474 state
->dev
->ifindex
, state
->dev
->name
, state
->in_dev
->mc_count
, querier
);
2478 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2479 im
->multiaddr
, im
->users
,
2480 im
->tm_running
, im
->tm_running
?
2481 jiffies_to_clock_t(im
->timer
.expires
-jiffies
) : 0,
2487 static const struct seq_operations igmp_mc_seq_ops
= {
2488 .start
= igmp_mc_seq_start
,
2489 .next
= igmp_mc_seq_next
,
2490 .stop
= igmp_mc_seq_stop
,
2491 .show
= igmp_mc_seq_show
,
2494 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2496 return seq_open_net(inode
, file
, &igmp_mc_seq_ops
,
2497 sizeof(struct igmp_mc_iter_state
));
2500 static const struct file_operations igmp_mc_seq_fops
= {
2501 .owner
= THIS_MODULE
,
2502 .open
= igmp_mc_seq_open
,
2504 .llseek
= seq_lseek
,
2505 .release
= seq_release_net
,
2508 struct igmp_mcf_iter_state
{
2509 struct seq_net_private p
;
2510 struct net_device
*dev
;
2511 struct in_device
*idev
;
2512 struct ip_mc_list
*im
;
2515 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2517 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2519 struct net
*net
= seq_file_net(seq
);
2520 struct ip_sf_list
*psf
= NULL
;
2521 struct ip_mc_list
*im
= NULL
;
2522 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2526 for_each_netdev_rcu(net
, state
->dev
) {
2527 struct in_device
*idev
;
2528 idev
= __in_dev_get_rcu(state
->dev
);
2529 if (unlikely(idev
== NULL
))
2531 im
= rcu_dereference(idev
->mc_list
);
2532 if (likely(im
!= NULL
)) {
2533 spin_lock_bh(&im
->lock
);
2535 if (likely(psf
!= NULL
)) {
2540 spin_unlock_bh(&im
->lock
);
2546 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2548 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2552 spin_unlock_bh(&state
->im
->lock
);
2553 state
->im
= state
->im
->next
;
2554 while (!state
->im
) {
2555 state
->dev
= next_net_device_rcu(state
->dev
);
2560 state
->idev
= __in_dev_get_rcu(state
->dev
);
2563 state
->im
= rcu_dereference(state
->idev
->mc_list
);
2567 spin_lock_bh(&state
->im
->lock
);
2568 psf
= state
->im
->sources
;
2574 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2576 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2578 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2580 return pos
? NULL
: psf
;
2583 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2587 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2590 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2592 struct ip_sf_list
*psf
;
2593 if (v
== SEQ_START_TOKEN
)
2594 psf
= igmp_mcf_get_first(seq
);
2596 psf
= igmp_mcf_get_next(seq
, v
);
2601 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2604 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2605 if (likely(state
->im
!= NULL
)) {
2606 spin_unlock_bh(&state
->im
->lock
);
2614 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2616 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2617 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2619 if (v
== SEQ_START_TOKEN
) {
2622 "%10s %10s %6s %6s\n", "Idx",
2624 "SRC", "INC", "EXC");
2628 "0x%08x %6lu %6lu\n",
2629 state
->dev
->ifindex
, state
->dev
->name
,
2630 ntohl(state
->im
->multiaddr
),
2631 ntohl(psf
->sf_inaddr
),
2632 psf
->sf_count
[MCAST_INCLUDE
],
2633 psf
->sf_count
[MCAST_EXCLUDE
]);
2638 static const struct seq_operations igmp_mcf_seq_ops
= {
2639 .start
= igmp_mcf_seq_start
,
2640 .next
= igmp_mcf_seq_next
,
2641 .stop
= igmp_mcf_seq_stop
,
2642 .show
= igmp_mcf_seq_show
,
2645 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2647 return seq_open_net(inode
, file
, &igmp_mcf_seq_ops
,
2648 sizeof(struct igmp_mcf_iter_state
));
2651 static const struct file_operations igmp_mcf_seq_fops
= {
2652 .owner
= THIS_MODULE
,
2653 .open
= igmp_mcf_seq_open
,
2655 .llseek
= seq_lseek
,
2656 .release
= seq_release_net
,
2659 static int __net_init
igmp_net_init(struct net
*net
)
2661 struct proc_dir_entry
*pde
;
2663 pde
= proc_net_fops_create(net
, "igmp", S_IRUGO
, &igmp_mc_seq_fops
);
2666 pde
= proc_net_fops_create(net
, "mcfilter", S_IRUGO
, &igmp_mcf_seq_fops
);
2672 proc_net_remove(net
, "igmp");
2677 static void __net_exit
igmp_net_exit(struct net
*net
)
2679 proc_net_remove(net
, "mcfilter");
2680 proc_net_remove(net
, "igmp");
2683 static struct pernet_operations igmp_net_ops
= {
2684 .init
= igmp_net_init
,
2685 .exit
= igmp_net_exit
,
2688 int __init
igmp_mc_proc_init(void)
2690 return register_pernet_subsys(&igmp_net_ops
);