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
);
152 static void ip_ma_put(struct ip_mc_list
*im
)
154 if (atomic_dec_and_test(&im
->refcnt
)) {
155 in_dev_put(im
->interface
);
160 #define for_each_pmc_rcu(in_dev, pmc) \
161 for (pmc = rcu_dereference(in_dev->mc_list); \
163 pmc = rcu_dereference(pmc->next_rcu))
165 #define for_each_pmc_rtnl(in_dev, pmc) \
166 for (pmc = rtnl_dereference(in_dev->mc_list); \
168 pmc = rtnl_dereference(pmc->next_rcu))
170 #ifdef CONFIG_IP_MULTICAST
176 static void igmp_stop_timer(struct ip_mc_list
*im
)
178 spin_lock_bh(&im
->lock
);
179 if (del_timer(&im
->timer
))
180 atomic_dec(&im
->refcnt
);
183 im
->unsolicit_count
= 0;
184 spin_unlock_bh(&im
->lock
);
187 /* It must be called with locked im->lock */
188 static void igmp_start_timer(struct ip_mc_list
*im
, int max_delay
)
190 int tv
= net_random() % max_delay
;
193 if (!mod_timer(&im
->timer
, jiffies
+tv
+2))
194 atomic_inc(&im
->refcnt
);
197 static void igmp_gq_start_timer(struct in_device
*in_dev
)
199 int tv
= net_random() % in_dev
->mr_maxdelay
;
201 in_dev
->mr_gq_running
= 1;
202 if (!mod_timer(&in_dev
->mr_gq_timer
, jiffies
+tv
+2))
206 static void igmp_ifc_start_timer(struct in_device
*in_dev
, int delay
)
208 int tv
= net_random() % delay
;
210 if (!mod_timer(&in_dev
->mr_ifc_timer
, jiffies
+tv
+2))
214 static void igmp_mod_timer(struct ip_mc_list
*im
, int max_delay
)
216 spin_lock_bh(&im
->lock
);
217 im
->unsolicit_count
= 0;
218 if (del_timer(&im
->timer
)) {
219 if ((long)(im
->timer
.expires
-jiffies
) < max_delay
) {
220 add_timer(&im
->timer
);
222 spin_unlock_bh(&im
->lock
);
225 atomic_dec(&im
->refcnt
);
227 igmp_start_timer(im
, max_delay
);
228 spin_unlock_bh(&im
->lock
);
233 * Send an IGMP report.
236 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
239 static int is_in(struct ip_mc_list
*pmc
, struct ip_sf_list
*psf
, int type
,
240 int gdeleted
, int sdeleted
)
243 case IGMPV3_MODE_IS_INCLUDE
:
244 case IGMPV3_MODE_IS_EXCLUDE
:
245 if (gdeleted
|| sdeleted
)
247 if (!(pmc
->gsquery
&& !psf
->sf_gsresp
)) {
248 if (pmc
->sfmode
== MCAST_INCLUDE
)
250 /* don't include if this source is excluded
253 if (psf
->sf_count
[MCAST_INCLUDE
])
254 return type
== IGMPV3_MODE_IS_INCLUDE
;
255 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
256 psf
->sf_count
[MCAST_EXCLUDE
];
259 case IGMPV3_CHANGE_TO_INCLUDE
:
260 if (gdeleted
|| sdeleted
)
262 return psf
->sf_count
[MCAST_INCLUDE
] != 0;
263 case IGMPV3_CHANGE_TO_EXCLUDE
:
264 if (gdeleted
|| sdeleted
)
266 if (pmc
->sfcount
[MCAST_EXCLUDE
] == 0 ||
267 psf
->sf_count
[MCAST_INCLUDE
])
269 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
270 psf
->sf_count
[MCAST_EXCLUDE
];
271 case IGMPV3_ALLOW_NEW_SOURCES
:
272 if (gdeleted
|| !psf
->sf_crcount
)
274 return (pmc
->sfmode
== MCAST_INCLUDE
) ^ sdeleted
;
275 case IGMPV3_BLOCK_OLD_SOURCES
:
276 if (pmc
->sfmode
== MCAST_INCLUDE
)
277 return gdeleted
|| (psf
->sf_crcount
&& sdeleted
);
278 return psf
->sf_crcount
&& !gdeleted
&& !sdeleted
;
284 igmp_scount(struct ip_mc_list
*pmc
, int type
, int gdeleted
, int sdeleted
)
286 struct ip_sf_list
*psf
;
289 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
290 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
))
297 #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
299 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, int size
)
304 struct igmpv3_report
*pig
;
305 struct net
*net
= dev_net(dev
);
309 skb
= alloc_skb(size
+ LL_ALLOCATED_SPACE(dev
),
310 GFP_ATOMIC
| __GFP_NOWARN
);
317 igmp_skb_size(skb
) = size
;
319 rt
= ip_route_output_ports(net
, &fl4
, NULL
, IGMPV3_ALL_MCR
, 0,
321 IPPROTO_IGMP
, 0, dev
->ifindex
);
327 skb_dst_set(skb
, &rt
->dst
);
330 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
332 skb_reset_network_header(skb
);
334 skb_put(skb
, sizeof(struct iphdr
) + 4);
337 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
339 pip
->frag_off
= htons(IP_DF
);
341 pip
->daddr
= fl4
.daddr
;
342 pip
->saddr
= fl4
.saddr
;
343 pip
->protocol
= IPPROTO_IGMP
;
344 pip
->tot_len
= 0; /* filled in later */
345 ip_select_ident(pip
, &rt
->dst
, NULL
);
346 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
347 ((u8
*)&pip
[1])[1] = 4;
348 ((u8
*)&pip
[1])[2] = 0;
349 ((u8
*)&pip
[1])[3] = 0;
351 skb
->transport_header
= skb
->network_header
+ sizeof(struct iphdr
) + 4;
352 skb_put(skb
, sizeof(*pig
));
353 pig
= igmpv3_report_hdr(skb
);
354 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
362 static int igmpv3_sendpack(struct sk_buff
*skb
)
364 struct igmphdr
*pig
= igmp_hdr(skb
);
365 const int igmplen
= skb
->tail
- skb
->transport_header
;
367 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
369 return ip_local_out(skb
);
372 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
374 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
, type
, gdel
, sdel
);
377 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
378 int type
, struct igmpv3_grec
**ppgr
)
380 struct net_device
*dev
= pmc
->interface
->dev
;
381 struct igmpv3_report
*pih
;
382 struct igmpv3_grec
*pgr
;
385 skb
= igmpv3_newpack(dev
, dev
->mtu
);
388 pgr
= (struct igmpv3_grec
*)skb_put(skb
, sizeof(struct igmpv3_grec
));
389 pgr
->grec_type
= type
;
390 pgr
->grec_auxwords
= 0;
392 pgr
->grec_mca
= pmc
->multiaddr
;
393 pih
= igmpv3_report_hdr(skb
);
394 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
399 #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
400 skb_tailroom(skb)) : 0)
402 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
403 int type
, int gdeleted
, int sdeleted
)
405 struct net_device
*dev
= pmc
->interface
->dev
;
406 struct igmpv3_report
*pih
;
407 struct igmpv3_grec
*pgr
= NULL
;
408 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
409 int scount
, stotal
, first
, isquery
, truncate
;
411 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
414 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
415 type
== IGMPV3_MODE_IS_EXCLUDE
;
416 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
417 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
421 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
426 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
428 /* EX and TO_EX get a fresh packet, if needed */
430 if (pih
&& pih
->ngrec
&&
431 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
433 igmpv3_sendpack(skb
);
434 skb
= igmpv3_newpack(dev
, dev
->mtu
);
439 for (psf
=*psf_list
; psf
; psf
=psf_next
) {
442 psf_next
= psf
->sf_next
;
444 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
449 /* clear marks on query responses */
453 if (AVAILABLE(skb
) < sizeof(__be32
) +
454 first
*sizeof(struct igmpv3_grec
)) {
455 if (truncate
&& !first
)
456 break; /* truncate these */
458 pgr
->grec_nsrcs
= htons(scount
);
460 igmpv3_sendpack(skb
);
461 skb
= igmpv3_newpack(dev
, dev
->mtu
);
466 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
471 psrc
= (__be32
*)skb_put(skb
, sizeof(__be32
));
472 *psrc
= psf
->sf_inaddr
;
474 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
475 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
477 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
479 psf_prev
->sf_next
= psf
->sf_next
;
481 *psf_list
= psf
->sf_next
;
491 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
492 type
== IGMPV3_BLOCK_OLD_SOURCES
)
494 if (pmc
->crcount
|| isquery
) {
495 /* make sure we have room for group header */
496 if (skb
&& AVAILABLE(skb
)<sizeof(struct igmpv3_grec
)) {
497 igmpv3_sendpack(skb
);
498 skb
= NULL
; /* add_grhead will get a new one */
500 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
504 pgr
->grec_nsrcs
= htons(scount
);
507 pmc
->gsquery
= 0; /* clear query state on report */
511 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
513 struct sk_buff
*skb
= NULL
;
518 for_each_pmc_rcu(in_dev
, pmc
) {
519 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
521 spin_lock_bh(&pmc
->lock
);
522 if (pmc
->sfcount
[MCAST_EXCLUDE
])
523 type
= IGMPV3_MODE_IS_EXCLUDE
;
525 type
= IGMPV3_MODE_IS_INCLUDE
;
526 skb
= add_grec(skb
, pmc
, type
, 0, 0);
527 spin_unlock_bh(&pmc
->lock
);
531 spin_lock_bh(&pmc
->lock
);
532 if (pmc
->sfcount
[MCAST_EXCLUDE
])
533 type
= IGMPV3_MODE_IS_EXCLUDE
;
535 type
= IGMPV3_MODE_IS_INCLUDE
;
536 skb
= add_grec(skb
, pmc
, type
, 0, 0);
537 spin_unlock_bh(&pmc
->lock
);
541 return igmpv3_sendpack(skb
);
545 * remove zero-count source records from a source filter list
547 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
549 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
552 for (psf
=*ppsf
; psf
; psf
= psf_next
) {
553 psf_next
= psf
->sf_next
;
554 if (psf
->sf_crcount
== 0) {
556 psf_prev
->sf_next
= psf
->sf_next
;
558 *ppsf
= psf
->sf_next
;
565 static void igmpv3_send_cr(struct in_device
*in_dev
)
567 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
568 struct sk_buff
*skb
= NULL
;
572 spin_lock_bh(&in_dev
->mc_tomb_lock
);
576 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc_next
) {
577 pmc_next
= pmc
->next
;
578 if (pmc
->sfmode
== MCAST_INCLUDE
) {
579 type
= IGMPV3_BLOCK_OLD_SOURCES
;
580 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
581 skb
= add_grec(skb
, pmc
, type
, 1, 0);
582 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
585 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
586 type
= IGMPV3_CHANGE_TO_INCLUDE
;
587 skb
= add_grec(skb
, pmc
, type
, 1, 0);
590 if (pmc
->crcount
== 0) {
591 igmpv3_clear_zeros(&pmc
->tomb
);
592 igmpv3_clear_zeros(&pmc
->sources
);
595 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
597 pmc_prev
->next
= pmc_next
;
599 in_dev
->mc_tomb
= pmc_next
;
600 in_dev_put(pmc
->interface
);
605 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
608 for_each_pmc_rcu(in_dev
, pmc
) {
609 spin_lock_bh(&pmc
->lock
);
610 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
611 type
= IGMPV3_BLOCK_OLD_SOURCES
;
612 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
614 type
= IGMPV3_ALLOW_NEW_SOURCES
;
615 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
617 skb
= add_grec(skb
, pmc
, type
, 0, 0);
618 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
620 /* filter mode changes */
622 if (pmc
->sfmode
== MCAST_EXCLUDE
)
623 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
625 type
= IGMPV3_CHANGE_TO_INCLUDE
;
626 skb
= add_grec(skb
, pmc
, type
, 0, 0);
629 spin_unlock_bh(&pmc
->lock
);
635 (void) igmpv3_sendpack(skb
);
638 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
645 struct net_device
*dev
= in_dev
->dev
;
646 struct net
*net
= dev_net(dev
);
647 __be32 group
= pmc
? pmc
->multiaddr
: 0;
651 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
652 return igmpv3_send_report(in_dev
, pmc
);
653 else if (type
== IGMP_HOST_LEAVE_MESSAGE
)
654 dst
= IGMP_ALL_ROUTER
;
658 rt
= ip_route_output_ports(net
, &fl4
, NULL
, dst
, 0,
660 IPPROTO_IGMP
, 0, dev
->ifindex
);
664 skb
= alloc_skb(IGMP_SIZE
+LL_ALLOCATED_SPACE(dev
), GFP_ATOMIC
);
670 skb_dst_set(skb
, &rt
->dst
);
672 skb_reserve(skb
, LL_RESERVED_SPACE(dev
));
674 skb_reset_network_header(skb
);
676 skb_put(skb
, sizeof(struct iphdr
) + 4);
679 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
681 iph
->frag_off
= htons(IP_DF
);
684 iph
->saddr
= fl4
.saddr
;
685 iph
->protocol
= IPPROTO_IGMP
;
686 ip_select_ident(iph
, &rt
->dst
, NULL
);
687 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
688 ((u8
*)&iph
[1])[1] = 4;
689 ((u8
*)&iph
[1])[2] = 0;
690 ((u8
*)&iph
[1])[3] = 0;
692 ih
= (struct igmphdr
*)skb_put(skb
, sizeof(struct igmphdr
));
697 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
699 return ip_local_out(skb
);
702 static void igmp_gq_timer_expire(unsigned long data
)
704 struct in_device
*in_dev
= (struct in_device
*)data
;
706 in_dev
->mr_gq_running
= 0;
707 igmpv3_send_report(in_dev
, NULL
);
708 __in_dev_put(in_dev
);
711 static void igmp_ifc_timer_expire(unsigned long data
)
713 struct in_device
*in_dev
= (struct in_device
*)data
;
715 igmpv3_send_cr(in_dev
);
716 if (in_dev
->mr_ifc_count
) {
717 in_dev
->mr_ifc_count
--;
718 igmp_ifc_start_timer(in_dev
, IGMP_Unsolicited_Report_Interval
);
720 __in_dev_put(in_dev
);
723 static void igmp_ifc_event(struct in_device
*in_dev
)
725 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
727 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
728 IGMP_Unsolicited_Report_Count
;
729 igmp_ifc_start_timer(in_dev
, 1);
733 static void igmp_timer_expire(unsigned long data
)
735 struct ip_mc_list
*im
=(struct ip_mc_list
*)data
;
736 struct in_device
*in_dev
= im
->interface
;
738 spin_lock(&im
->lock
);
741 if (im
->unsolicit_count
) {
742 im
->unsolicit_count
--;
743 igmp_start_timer(im
, IGMP_Unsolicited_Report_Interval
);
746 spin_unlock(&im
->lock
);
748 if (IGMP_V1_SEEN(in_dev
))
749 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
750 else if (IGMP_V2_SEEN(in_dev
))
751 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
753 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
758 /* mark EXCLUDE-mode sources */
759 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
761 struct ip_sf_list
*psf
;
765 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
768 for (i
=0; i
<nsrcs
; i
++) {
769 /* skip inactive filters */
770 if (pmc
->sfcount
[MCAST_INCLUDE
] ||
771 pmc
->sfcount
[MCAST_EXCLUDE
] !=
772 psf
->sf_count
[MCAST_EXCLUDE
])
774 if (srcs
[i
] == psf
->sf_inaddr
) {
781 if (scount
== nsrcs
) /* all sources excluded */
786 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
788 struct ip_sf_list
*psf
;
791 if (pmc
->sfmode
== MCAST_EXCLUDE
)
792 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
794 /* mark INCLUDE-mode sources */
796 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
799 for (i
=0; i
<nsrcs
; i
++)
800 if (srcs
[i
] == psf
->sf_inaddr
) {
814 static void igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
816 struct ip_mc_list
*im
;
818 /* Timers are only set for non-local groups */
820 if (group
== IGMP_ALL_HOSTS
)
824 for_each_pmc_rcu(in_dev
, im
) {
825 if (im
->multiaddr
== group
) {
833 static void igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
836 struct igmphdr
*ih
= igmp_hdr(skb
);
837 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
838 struct ip_mc_list
*im
;
839 __be32 group
= ih
->group
;
846 /* Alas, old v1 router presents here. */
848 max_delay
= IGMP_Query_Response_Interval
;
849 in_dev
->mr_v1_seen
= jiffies
+
850 IGMP_V1_Router_Present_Timeout
;
853 /* v2 router present */
854 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
855 in_dev
->mr_v2_seen
= jiffies
+
856 IGMP_V2_Router_Present_Timeout
;
858 /* cancel the interface change timer */
859 in_dev
->mr_ifc_count
= 0;
860 if (del_timer(&in_dev
->mr_ifc_timer
))
861 __in_dev_put(in_dev
);
862 /* clear deleted report items */
863 igmpv3_clear_delrec(in_dev
);
864 } else if (len
< 12) {
865 return; /* ignore bogus packet; freed by caller */
866 } else if (IGMP_V1_SEEN(in_dev
)) {
867 /* This is a v3 query with v1 queriers present */
868 max_delay
= IGMP_Query_Response_Interval
;
870 } else if (IGMP_V2_SEEN(in_dev
)) {
871 /* this is a v3 query with v2 queriers present;
872 * Interpretation of the max_delay code is problematic here.
873 * A real v2 host would use ih_code directly, while v3 has a
874 * different encoding. We use the v3 encoding as more likely
875 * to be intended in a v3 query.
877 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
879 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
882 ih3
= igmpv3_query_hdr(skb
);
884 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
885 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
887 ih3
= igmpv3_query_hdr(skb
);
890 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
892 max_delay
= 1; /* can't mod w/ 0 */
893 in_dev
->mr_maxdelay
= max_delay
;
895 in_dev
->mr_qrv
= ih3
->qrv
;
896 if (!group
) { /* general query */
898 return; /* no sources allowed */
899 igmp_gq_start_timer(in_dev
);
902 /* mark sources to include, if group & source-specific */
903 mark
= ih3
->nsrcs
!= 0;
907 * - Start the timers in all of our membership records
908 * that the query applies to for the interface on
909 * which the query arrived excl. those that belong
910 * to a "local" group (224.0.0.X)
911 * - For timers already running check if they need to
913 * - Use the igmp->igmp_code field as the maximum
917 for_each_pmc_rcu(in_dev
, im
) {
920 if (group
&& group
!= im
->multiaddr
)
922 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
924 spin_lock_bh(&im
->lock
);
926 im
->gsquery
= im
->gsquery
&& mark
;
929 changed
= !im
->gsquery
||
930 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
931 spin_unlock_bh(&im
->lock
);
933 igmp_mod_timer(im
, max_delay
);
938 /* called in rcu_read_lock() section */
939 int igmp_rcv(struct sk_buff
*skb
)
941 /* This basically follows the spec line by line -- see RFC1112 */
943 struct in_device
*in_dev
= __in_dev_get_rcu(skb
->dev
);
949 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
952 switch (skb
->ip_summed
) {
953 case CHECKSUM_COMPLETE
:
954 if (!csum_fold(skb
->csum
))
959 if (__skb_checksum_complete(skb
))
965 case IGMP_HOST_MEMBERSHIP_QUERY
:
966 igmp_heard_query(in_dev
, skb
, len
);
968 case IGMP_HOST_MEMBERSHIP_REPORT
:
969 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
970 /* Is it our report looped back? */
971 if (rt_is_output_route(skb_rtable(skb
)))
973 /* don't rely on MC router hearing unicast reports */
974 if (skb
->pkt_type
== PACKET_MULTICAST
||
975 skb
->pkt_type
== PACKET_BROADCAST
)
976 igmp_heard_report(in_dev
, ih
->group
);
979 #ifdef CONFIG_IP_PIMSM_V1
980 return pim_rcv_v1(skb
);
982 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
985 case IGMP_HOST_LEAVE_MESSAGE
:
987 case IGMP_MTRACE_RESP
:
1002 * Add a filter to a device
1005 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
1007 char buf
[MAX_ADDR_LEN
];
1008 struct net_device
*dev
= in_dev
->dev
;
1010 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1011 We will get multicast token leakage, when IFF_MULTICAST
1012 is changed. This check should be done in dev->set_multicast_list
1013 routine. Something sort of:
1014 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1017 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1018 dev_mc_add(dev
, buf
);
1022 * Remove a filter from a device
1025 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1027 char buf
[MAX_ADDR_LEN
];
1028 struct net_device
*dev
= in_dev
->dev
;
1030 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1031 dev_mc_del(dev
, buf
);
1034 #ifdef CONFIG_IP_MULTICAST
1036 * deleted ip_mc_list manipulation
1038 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1040 struct ip_mc_list
*pmc
;
1042 /* this is an "ip_mc_list" for convenience; only the fields below
1043 * are actually used. In particular, the refcnt and users are not
1044 * used for management of the delete list. Using the same structure
1045 * for deleted items allows change reports to use common code with
1046 * non-deleted or query-response MCA's.
1048 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1051 spin_lock_bh(&im
->lock
);
1052 pmc
->interface
= im
->interface
;
1053 in_dev_hold(in_dev
);
1054 pmc
->multiaddr
= im
->multiaddr
;
1055 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1056 IGMP_Unsolicited_Report_Count
;
1057 pmc
->sfmode
= im
->sfmode
;
1058 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1059 struct ip_sf_list
*psf
;
1061 pmc
->tomb
= im
->tomb
;
1062 pmc
->sources
= im
->sources
;
1063 im
->tomb
= im
->sources
= NULL
;
1064 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1065 psf
->sf_crcount
= pmc
->crcount
;
1067 spin_unlock_bh(&im
->lock
);
1069 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1070 pmc
->next
= in_dev
->mc_tomb
;
1071 in_dev
->mc_tomb
= pmc
;
1072 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1075 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
)
1077 struct ip_mc_list
*pmc
, *pmc_prev
;
1078 struct ip_sf_list
*psf
, *psf_next
;
1080 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1082 for (pmc
=in_dev
->mc_tomb
; pmc
; pmc
=pmc
->next
) {
1083 if (pmc
->multiaddr
== multiaddr
)
1089 pmc_prev
->next
= pmc
->next
;
1091 in_dev
->mc_tomb
= pmc
->next
;
1093 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1095 for (psf
=pmc
->tomb
; psf
; psf
=psf_next
) {
1096 psf_next
= psf
->sf_next
;
1099 in_dev_put(pmc
->interface
);
1104 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1106 struct ip_mc_list
*pmc
, *nextpmc
;
1108 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1109 pmc
= in_dev
->mc_tomb
;
1110 in_dev
->mc_tomb
= NULL
;
1111 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1113 for (; pmc
; pmc
= nextpmc
) {
1114 nextpmc
= pmc
->next
;
1115 ip_mc_clear_src(pmc
);
1116 in_dev_put(pmc
->interface
);
1119 /* clear dead sources, too */
1121 for_each_pmc_rcu(in_dev
, pmc
) {
1122 struct ip_sf_list
*psf
, *psf_next
;
1124 spin_lock_bh(&pmc
->lock
);
1127 spin_unlock_bh(&pmc
->lock
);
1128 for (; psf
; psf
=psf_next
) {
1129 psf_next
= psf
->sf_next
;
1137 static void igmp_group_dropped(struct ip_mc_list
*im
)
1139 struct in_device
*in_dev
= im
->interface
;
1140 #ifdef CONFIG_IP_MULTICAST
1146 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1149 #ifdef CONFIG_IP_MULTICAST
1150 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1153 reporter
= im
->reporter
;
1154 igmp_stop_timer(im
);
1156 if (!in_dev
->dead
) {
1157 if (IGMP_V1_SEEN(in_dev
))
1159 if (IGMP_V2_SEEN(in_dev
)) {
1161 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1165 igmpv3_add_delrec(in_dev
, im
);
1167 igmp_ifc_event(in_dev
);
1172 static void igmp_group_added(struct ip_mc_list
*im
)
1174 struct in_device
*in_dev
= im
->interface
;
1176 if (im
->loaded
== 0) {
1178 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1181 #ifdef CONFIG_IP_MULTICAST
1182 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1187 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1188 spin_lock_bh(&im
->lock
);
1189 igmp_start_timer(im
, IGMP_Initial_Report_Delay
);
1190 spin_unlock_bh(&im
->lock
);
1195 im
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1196 IGMP_Unsolicited_Report_Count
;
1197 igmp_ifc_event(in_dev
);
1203 * Multicast list managers
1208 * A socket has joined a multicast group on device dev.
1211 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1213 struct ip_mc_list
*im
;
1217 for_each_pmc_rtnl(in_dev
, im
) {
1218 if (im
->multiaddr
== addr
) {
1220 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1225 im
= kzalloc(sizeof(*im
), GFP_KERNEL
);
1230 im
->interface
= in_dev
;
1231 in_dev_hold(in_dev
);
1232 im
->multiaddr
= addr
;
1233 /* initial mode is (EX, empty) */
1234 im
->sfmode
= MCAST_EXCLUDE
;
1235 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1236 atomic_set(&im
->refcnt
, 1);
1237 spin_lock_init(&im
->lock
);
1238 #ifdef CONFIG_IP_MULTICAST
1239 setup_timer(&im
->timer
, &igmp_timer_expire
, (unsigned long)im
);
1240 im
->unsolicit_count
= IGMP_Unsolicited_Report_Count
;
1243 im
->next_rcu
= in_dev
->mc_list
;
1245 rcu_assign_pointer(in_dev
->mc_list
, im
);
1247 #ifdef CONFIG_IP_MULTICAST
1248 igmpv3_del_delrec(in_dev
, im
->multiaddr
);
1250 igmp_group_added(im
);
1252 ip_rt_multicast_event(in_dev
);
1256 EXPORT_SYMBOL(ip_mc_inc_group
);
1259 * Resend IGMP JOIN report; used for bonding.
1260 * Called with rcu_read_lock()
1262 void ip_mc_rejoin_groups(struct in_device
*in_dev
)
1264 #ifdef CONFIG_IP_MULTICAST
1265 struct ip_mc_list
*im
;
1268 for_each_pmc_rcu(in_dev
, im
) {
1269 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1272 /* a failover is happening and switches
1273 * must be notified immediately
1275 if (IGMP_V1_SEEN(in_dev
))
1276 type
= IGMP_HOST_MEMBERSHIP_REPORT
;
1277 else if (IGMP_V2_SEEN(in_dev
))
1278 type
= IGMPV2_HOST_MEMBERSHIP_REPORT
;
1280 type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
1281 igmp_send_report(in_dev
, im
, type
);
1285 EXPORT_SYMBOL(ip_mc_rejoin_groups
);
1288 * A socket has left a multicast group on device dev
1291 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1293 struct ip_mc_list
*i
;
1294 struct ip_mc_list __rcu
**ip
;
1298 for (ip
= &in_dev
->mc_list
;
1299 (i
= rtnl_dereference(*ip
)) != NULL
;
1300 ip
= &i
->next_rcu
) {
1301 if (i
->multiaddr
== addr
) {
1302 if (--i
->users
== 0) {
1305 igmp_group_dropped(i
);
1309 ip_rt_multicast_event(in_dev
);
1318 EXPORT_SYMBOL(ip_mc_dec_group
);
1320 /* Device changing type */
1322 void ip_mc_unmap(struct in_device
*in_dev
)
1324 struct ip_mc_list
*pmc
;
1328 for_each_pmc_rtnl(in_dev
, pmc
)
1329 igmp_group_dropped(pmc
);
1332 void ip_mc_remap(struct in_device
*in_dev
)
1334 struct ip_mc_list
*pmc
;
1338 for_each_pmc_rtnl(in_dev
, pmc
)
1339 igmp_group_added(pmc
);
1342 /* Device going down */
1344 void ip_mc_down(struct in_device
*in_dev
)
1346 struct ip_mc_list
*pmc
;
1350 for_each_pmc_rtnl(in_dev
, pmc
)
1351 igmp_group_dropped(pmc
);
1353 #ifdef CONFIG_IP_MULTICAST
1354 in_dev
->mr_ifc_count
= 0;
1355 if (del_timer(&in_dev
->mr_ifc_timer
))
1356 __in_dev_put(in_dev
);
1357 in_dev
->mr_gq_running
= 0;
1358 if (del_timer(&in_dev
->mr_gq_timer
))
1359 __in_dev_put(in_dev
);
1360 igmpv3_clear_delrec(in_dev
);
1363 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1366 void ip_mc_init_dev(struct in_device
*in_dev
)
1370 in_dev
->mc_tomb
= NULL
;
1371 #ifdef CONFIG_IP_MULTICAST
1372 in_dev
->mr_gq_running
= 0;
1373 setup_timer(&in_dev
->mr_gq_timer
, igmp_gq_timer_expire
,
1374 (unsigned long)in_dev
);
1375 in_dev
->mr_ifc_count
= 0;
1376 in_dev
->mc_count
= 0;
1377 setup_timer(&in_dev
->mr_ifc_timer
, igmp_ifc_timer_expire
,
1378 (unsigned long)in_dev
);
1379 in_dev
->mr_qrv
= IGMP_Unsolicited_Report_Count
;
1382 spin_lock_init(&in_dev
->mc_tomb_lock
);
1385 /* Device going up */
1387 void ip_mc_up(struct in_device
*in_dev
)
1389 struct ip_mc_list
*pmc
;
1393 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1395 for_each_pmc_rtnl(in_dev
, pmc
)
1396 igmp_group_added(pmc
);
1400 * Device is about to be destroyed: clean up.
1403 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1405 struct ip_mc_list
*i
;
1409 /* Deactivate timers */
1412 while ((i
= rtnl_dereference(in_dev
->mc_list
)) != NULL
) {
1413 in_dev
->mc_list
= i
->next_rcu
;
1416 /* We've dropped the groups in ip_mc_down already */
1422 /* RTNL is locked */
1423 static struct in_device
*ip_mc_find_dev(struct net
*net
, struct ip_mreqn
*imr
)
1425 struct net_device
*dev
= NULL
;
1426 struct in_device
*idev
= NULL
;
1428 if (imr
->imr_ifindex
) {
1429 idev
= inetdev_by_index(net
, imr
->imr_ifindex
);
1432 if (imr
->imr_address
.s_addr
) {
1433 dev
= __ip_dev_find(net
, imr
->imr_address
.s_addr
, false);
1439 struct rtable
*rt
= ip_route_output(net
,
1440 imr
->imr_multiaddr
.s_addr
,
1448 imr
->imr_ifindex
= dev
->ifindex
;
1449 idev
= __in_dev_get_rtnl(dev
);
1455 * Join a socket to a group
1457 int sysctl_igmp_max_memberships __read_mostly
= IP_MAX_MEMBERSHIPS
;
1458 int sysctl_igmp_max_msf __read_mostly
= IP_MAX_MSF
;
1461 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1464 struct ip_sf_list
*psf
, *psf_prev
;
1468 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1469 if (psf
->sf_inaddr
== *psfsrc
)
1473 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1474 /* source filter not found, or count wrong => bug */
1477 psf
->sf_count
[sfmode
]--;
1478 if (psf
->sf_count
[sfmode
] == 0) {
1479 ip_rt_multicast_event(pmc
->interface
);
1481 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1482 #ifdef CONFIG_IP_MULTICAST
1483 struct in_device
*in_dev
= pmc
->interface
;
1486 /* no more filters for this source */
1488 psf_prev
->sf_next
= psf
->sf_next
;
1490 pmc
->sources
= psf
->sf_next
;
1491 #ifdef CONFIG_IP_MULTICAST
1492 if (psf
->sf_oldin
&&
1493 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1494 psf
->sf_crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1495 IGMP_Unsolicited_Report_Count
;
1496 psf
->sf_next
= pmc
->tomb
;
1506 #ifndef CONFIG_IP_MULTICAST
1507 #define igmp_ifc_event(x) do { } while (0)
1510 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1511 int sfcount
, __be32
*psfsrc
, int delta
)
1513 struct ip_mc_list
*pmc
;
1520 for_each_pmc_rcu(in_dev
, pmc
) {
1521 if (*pmca
== pmc
->multiaddr
)
1525 /* MCA not found?? bug */
1529 spin_lock_bh(&pmc
->lock
);
1531 #ifdef CONFIG_IP_MULTICAST
1536 if (!pmc
->sfcount
[sfmode
])
1538 pmc
->sfcount
[sfmode
]--;
1541 for (i
=0; i
<sfcount
; i
++) {
1542 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1544 changerec
|= rv
> 0;
1548 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1549 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1550 pmc
->sfcount
[MCAST_INCLUDE
]) {
1551 #ifdef CONFIG_IP_MULTICAST
1552 struct ip_sf_list
*psf
;
1555 /* filter mode change */
1556 pmc
->sfmode
= MCAST_INCLUDE
;
1557 #ifdef CONFIG_IP_MULTICAST
1558 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1559 IGMP_Unsolicited_Report_Count
;
1560 in_dev
->mr_ifc_count
= pmc
->crcount
;
1561 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1562 psf
->sf_crcount
= 0;
1563 igmp_ifc_event(pmc
->interface
);
1564 } else if (sf_setstate(pmc
) || changerec
) {
1565 igmp_ifc_event(pmc
->interface
);
1569 spin_unlock_bh(&pmc
->lock
);
1574 * Add multicast single-source filter to the interface list
1576 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1577 __be32
*psfsrc
, int delta
)
1579 struct ip_sf_list
*psf
, *psf_prev
;
1582 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1583 if (psf
->sf_inaddr
== *psfsrc
)
1588 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1591 psf
->sf_inaddr
= *psfsrc
;
1593 psf_prev
->sf_next
= psf
;
1597 psf
->sf_count
[sfmode
]++;
1598 if (psf
->sf_count
[sfmode
] == 1) {
1599 ip_rt_multicast_event(pmc
->interface
);
1604 #ifdef CONFIG_IP_MULTICAST
1605 static void sf_markstate(struct ip_mc_list
*pmc
)
1607 struct ip_sf_list
*psf
;
1608 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1610 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
)
1611 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1612 psf
->sf_oldin
= mca_xcount
==
1613 psf
->sf_count
[MCAST_EXCLUDE
] &&
1614 !psf
->sf_count
[MCAST_INCLUDE
];
1616 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1619 static int sf_setstate(struct ip_mc_list
*pmc
)
1621 struct ip_sf_list
*psf
, *dpsf
;
1622 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1623 int qrv
= pmc
->interface
->mr_qrv
;
1627 for (psf
=pmc
->sources
; psf
; psf
=psf
->sf_next
) {
1628 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1629 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1630 !psf
->sf_count
[MCAST_INCLUDE
];
1632 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1634 if (!psf
->sf_oldin
) {
1635 struct ip_sf_list
*prev
= NULL
;
1637 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
) {
1638 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1644 prev
->sf_next
= dpsf
->sf_next
;
1646 pmc
->tomb
= dpsf
->sf_next
;
1649 psf
->sf_crcount
= qrv
;
1652 } else if (psf
->sf_oldin
) {
1654 psf
->sf_crcount
= 0;
1656 * add or update "delete" records if an active filter
1659 for (dpsf
=pmc
->tomb
; dpsf
; dpsf
=dpsf
->sf_next
)
1660 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1663 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1667 /* pmc->lock held by callers */
1668 dpsf
->sf_next
= pmc
->tomb
;
1671 dpsf
->sf_crcount
= qrv
;
1680 * Add multicast source filter list to the interface list
1682 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1683 int sfcount
, __be32
*psfsrc
, int delta
)
1685 struct ip_mc_list
*pmc
;
1692 for_each_pmc_rcu(in_dev
, pmc
) {
1693 if (*pmca
== pmc
->multiaddr
)
1697 /* MCA not found?? bug */
1701 spin_lock_bh(&pmc
->lock
);
1704 #ifdef CONFIG_IP_MULTICAST
1707 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
1709 pmc
->sfcount
[sfmode
]++;
1711 for (i
=0; i
<sfcount
; i
++) {
1712 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
], delta
);
1719 pmc
->sfcount
[sfmode
]--;
1721 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1722 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
1723 #ifdef CONFIG_IP_MULTICAST
1724 struct ip_sf_list
*psf
;
1725 in_dev
= pmc
->interface
;
1728 /* filter mode change */
1729 if (pmc
->sfcount
[MCAST_EXCLUDE
])
1730 pmc
->sfmode
= MCAST_EXCLUDE
;
1731 else if (pmc
->sfcount
[MCAST_INCLUDE
])
1732 pmc
->sfmode
= MCAST_INCLUDE
;
1733 #ifdef CONFIG_IP_MULTICAST
1734 /* else no filters; keep old mode for reports */
1736 pmc
->crcount
= in_dev
->mr_qrv
? in_dev
->mr_qrv
:
1737 IGMP_Unsolicited_Report_Count
;
1738 in_dev
->mr_ifc_count
= pmc
->crcount
;
1739 for (psf
=pmc
->sources
; psf
; psf
= psf
->sf_next
)
1740 psf
->sf_crcount
= 0;
1741 igmp_ifc_event(in_dev
);
1742 } else if (sf_setstate(pmc
)) {
1743 igmp_ifc_event(in_dev
);
1746 spin_unlock_bh(&pmc
->lock
);
1750 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
1752 struct ip_sf_list
*psf
, *nextpsf
;
1754 for (psf
=pmc
->tomb
; psf
; psf
=nextpsf
) {
1755 nextpsf
= psf
->sf_next
;
1759 for (psf
=pmc
->sources
; psf
; psf
=nextpsf
) {
1760 nextpsf
= psf
->sf_next
;
1763 pmc
->sources
= NULL
;
1764 pmc
->sfmode
= MCAST_EXCLUDE
;
1765 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
1766 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
1771 * Join a multicast group
1773 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1776 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
1777 struct ip_mc_socklist
*iml
= NULL
, *i
;
1778 struct in_device
*in_dev
;
1779 struct inet_sock
*inet
= inet_sk(sk
);
1780 struct net
*net
= sock_net(sk
);
1784 if (!ipv4_is_multicast(addr
))
1789 in_dev
= ip_mc_find_dev(net
, imr
);
1798 ifindex
= imr
->imr_ifindex
;
1799 for_each_pmc_rtnl(inet
, i
) {
1800 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
1801 i
->multi
.imr_ifindex
== ifindex
)
1806 if (count
>= sysctl_igmp_max_memberships
)
1808 iml
= sock_kmalloc(sk
, sizeof(*iml
), GFP_KERNEL
);
1812 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
1813 iml
->next_rcu
= inet
->mc_list
;
1815 iml
->sfmode
= MCAST_EXCLUDE
;
1816 rcu_assign_pointer(inet
->mc_list
, iml
);
1817 ip_mc_inc_group(in_dev
, addr
);
1823 EXPORT_SYMBOL(ip_mc_join_group
);
1825 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
1826 struct in_device
*in_dev
)
1828 struct ip_sf_socklist
*psf
= rtnl_dereference(iml
->sflist
);
1832 /* any-source empty exclude case */
1833 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1834 iml
->sfmode
, 0, NULL
, 0);
1836 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
1837 iml
->sfmode
, psf
->sl_count
, psf
->sl_addr
, 0);
1838 rcu_assign_pointer(iml
->sflist
, NULL
);
1839 /* decrease mem now to avoid the memleak warning */
1840 atomic_sub(IP_SFLSIZE(psf
->sl_max
), &sk
->sk_omem_alloc
);
1841 kfree_rcu(psf
, rcu
);
1846 * Ask a socket to leave a group.
1849 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
1851 struct inet_sock
*inet
= inet_sk(sk
);
1852 struct ip_mc_socklist
*iml
;
1853 struct ip_mc_socklist __rcu
**imlp
;
1854 struct in_device
*in_dev
;
1855 struct net
*net
= sock_net(sk
);
1856 __be32 group
= imr
->imr_multiaddr
.s_addr
;
1858 int ret
= -EADDRNOTAVAIL
;
1861 in_dev
= ip_mc_find_dev(net
, imr
);
1862 ifindex
= imr
->imr_ifindex
;
1863 for (imlp
= &inet
->mc_list
;
1864 (iml
= rtnl_dereference(*imlp
)) != NULL
;
1865 imlp
= &iml
->next_rcu
) {
1866 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
1869 if (iml
->multi
.imr_ifindex
!= ifindex
)
1871 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
1872 iml
->multi
.imr_address
.s_addr
)
1875 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
1877 *imlp
= iml
->next_rcu
;
1880 ip_mc_dec_group(in_dev
, group
);
1882 /* decrease mem now to avoid the memleak warning */
1883 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
1884 kfree_rcu(iml
, rcu
);
1893 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
1894 ip_mreq_source
*mreqs
, int ifindex
)
1897 struct ip_mreqn imr
;
1898 __be32 addr
= mreqs
->imr_multiaddr
;
1899 struct ip_mc_socklist
*pmc
;
1900 struct in_device
*in_dev
= NULL
;
1901 struct inet_sock
*inet
= inet_sk(sk
);
1902 struct ip_sf_socklist
*psl
;
1903 struct net
*net
= sock_net(sk
);
1907 if (!ipv4_is_multicast(addr
))
1912 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
1913 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
1914 imr
.imr_ifindex
= ifindex
;
1915 in_dev
= ip_mc_find_dev(net
, &imr
);
1921 err
= -EADDRNOTAVAIL
;
1923 for_each_pmc_rtnl(inet
, pmc
) {
1924 if ((pmc
->multi
.imr_multiaddr
.s_addr
==
1925 imr
.imr_multiaddr
.s_addr
) &&
1926 (pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
))
1929 if (!pmc
) { /* must have a prior join */
1933 /* if a source filter was set, must be the same mode as before */
1935 if (pmc
->sfmode
!= omode
) {
1939 } else if (pmc
->sfmode
!= omode
) {
1940 /* allow mode switches for empty-set filters */
1941 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
1942 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
1944 pmc
->sfmode
= omode
;
1947 psl
= rtnl_dereference(pmc
->sflist
);
1950 goto done
; /* err = -EADDRNOTAVAIL */
1952 for (i
=0; i
<psl
->sl_count
; i
++) {
1953 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
1958 if (rv
) /* source not found */
1959 goto done
; /* err = -EADDRNOTAVAIL */
1961 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1962 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
1967 /* update the interface filter */
1968 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
1969 &mreqs
->imr_sourceaddr
, 1);
1971 for (j
=i
+1; j
<psl
->sl_count
; j
++)
1972 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
1977 /* else, add a new source to the filter */
1979 if (psl
&& psl
->sl_count
>= sysctl_igmp_max_msf
) {
1983 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
1984 struct ip_sf_socklist
*newpsl
;
1985 int count
= IP_SFBLOCK
;
1988 count
+= psl
->sl_max
;
1989 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
1994 newpsl
->sl_max
= count
;
1995 newpsl
->sl_count
= count
- IP_SFBLOCK
;
1997 for (i
=0; i
<psl
->sl_count
; i
++)
1998 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
1999 /* decrease mem now to avoid the memleak warning */
2000 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2001 kfree_rcu(psl
, rcu
);
2003 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2006 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
2007 for (i
=0; i
<psl
->sl_count
; i
++) {
2008 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2013 if (rv
== 0) /* address already there is an error */
2015 for (j
=psl
->sl_count
-1; j
>=i
; j
--)
2016 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
2017 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
2020 /* update the interface list */
2021 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2022 &mreqs
->imr_sourceaddr
, 1);
2026 return ip_mc_leave_group(sk
, &imr
);
2030 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
2033 struct ip_mreqn imr
;
2034 __be32 addr
= msf
->imsf_multiaddr
;
2035 struct ip_mc_socklist
*pmc
;
2036 struct in_device
*in_dev
;
2037 struct inet_sock
*inet
= inet_sk(sk
);
2038 struct ip_sf_socklist
*newpsl
, *psl
;
2039 struct net
*net
= sock_net(sk
);
2042 if (!ipv4_is_multicast(addr
))
2044 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2045 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2050 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2051 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2052 imr
.imr_ifindex
= ifindex
;
2053 in_dev
= ip_mc_find_dev(net
, &imr
);
2060 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2061 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2066 for_each_pmc_rtnl(inet
, pmc
) {
2067 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2068 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2071 if (!pmc
) { /* must have a prior join */
2075 if (msf
->imsf_numsrc
) {
2076 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2082 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2083 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2084 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2085 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2086 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2088 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2093 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2094 msf
->imsf_fmode
, 0, NULL
, 0);
2096 psl
= rtnl_dereference(pmc
->sflist
);
2098 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2099 psl
->sl_count
, psl
->sl_addr
, 0);
2100 /* decrease mem now to avoid the memleak warning */
2101 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2102 kfree_rcu(psl
, rcu
);
2104 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2106 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2107 pmc
->sfmode
= msf
->imsf_fmode
;
2112 err
= ip_mc_leave_group(sk
, &imr
);
2116 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2117 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2119 int err
, len
, count
, copycount
;
2120 struct ip_mreqn imr
;
2121 __be32 addr
= msf
->imsf_multiaddr
;
2122 struct ip_mc_socklist
*pmc
;
2123 struct in_device
*in_dev
;
2124 struct inet_sock
*inet
= inet_sk(sk
);
2125 struct ip_sf_socklist
*psl
;
2126 struct net
*net
= sock_net(sk
);
2128 if (!ipv4_is_multicast(addr
))
2133 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2134 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2135 imr
.imr_ifindex
= 0;
2136 in_dev
= ip_mc_find_dev(net
, &imr
);
2142 err
= -EADDRNOTAVAIL
;
2144 for_each_pmc_rtnl(inet
, pmc
) {
2145 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2146 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2149 if (!pmc
) /* must have a prior join */
2151 msf
->imsf_fmode
= pmc
->sfmode
;
2152 psl
= rtnl_dereference(pmc
->sflist
);
2158 count
= psl
->sl_count
;
2160 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2161 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2162 msf
->imsf_numsrc
= count
;
2163 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2164 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2168 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2176 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2177 struct group_filter __user
*optval
, int __user
*optlen
)
2179 int err
, i
, count
, copycount
;
2180 struct sockaddr_in
*psin
;
2182 struct ip_mc_socklist
*pmc
;
2183 struct inet_sock
*inet
= inet_sk(sk
);
2184 struct ip_sf_socklist
*psl
;
2186 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2187 if (psin
->sin_family
!= AF_INET
)
2189 addr
= psin
->sin_addr
.s_addr
;
2190 if (!ipv4_is_multicast(addr
))
2195 err
= -EADDRNOTAVAIL
;
2197 for_each_pmc_rtnl(inet
, pmc
) {
2198 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2199 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2202 if (!pmc
) /* must have a prior join */
2204 gsf
->gf_fmode
= pmc
->sfmode
;
2205 psl
= rtnl_dereference(pmc
->sflist
);
2207 count
= psl
? psl
->sl_count
: 0;
2208 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2209 gsf
->gf_numsrc
= count
;
2210 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2211 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2214 for (i
=0; i
<copycount
; i
++) {
2215 struct sockaddr_storage ss
;
2217 psin
= (struct sockaddr_in
*)&ss
;
2218 memset(&ss
, 0, sizeof(ss
));
2219 psin
->sin_family
= AF_INET
;
2220 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2221 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2231 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2233 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2235 struct inet_sock
*inet
= inet_sk(sk
);
2236 struct ip_mc_socklist
*pmc
;
2237 struct ip_sf_socklist
*psl
;
2242 if (!ipv4_is_multicast(loc_addr
))
2246 for_each_pmc_rcu(inet
, pmc
) {
2247 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2248 pmc
->multi
.imr_ifindex
== dif
)
2254 psl
= rcu_dereference(pmc
->sflist
);
2255 ret
= (pmc
->sfmode
== MCAST_EXCLUDE
);
2259 for (i
=0; i
<psl
->sl_count
; i
++) {
2260 if (psl
->sl_addr
[i
] == rmt_addr
)
2264 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2266 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2276 * A socket is closing.
2279 void ip_mc_drop_socket(struct sock
*sk
)
2281 struct inet_sock
*inet
= inet_sk(sk
);
2282 struct ip_mc_socklist
*iml
;
2283 struct net
*net
= sock_net(sk
);
2285 if (inet
->mc_list
== NULL
)
2289 while ((iml
= rtnl_dereference(inet
->mc_list
)) != NULL
) {
2290 struct in_device
*in_dev
;
2292 inet
->mc_list
= iml
->next_rcu
;
2293 in_dev
= inetdev_by_index(net
, iml
->multi
.imr_ifindex
);
2294 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2296 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2297 /* decrease mem now to avoid the memleak warning */
2298 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2299 kfree_rcu(iml
, rcu
);
2304 /* called with rcu_read_lock() */
2305 int ip_check_mc_rcu(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u16 proto
)
2307 struct ip_mc_list
*im
;
2308 struct ip_sf_list
*psf
;
2311 for_each_pmc_rcu(in_dev
, im
) {
2312 if (im
->multiaddr
== mc_addr
)
2315 if (im
&& proto
== IPPROTO_IGMP
) {
2319 for (psf
=im
->sources
; psf
; psf
=psf
->sf_next
) {
2320 if (psf
->sf_inaddr
== src_addr
)
2324 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2325 psf
->sf_count
[MCAST_EXCLUDE
] !=
2326 im
->sfcount
[MCAST_EXCLUDE
];
2328 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2330 rv
= 1; /* unspecified source; tentatively allow */
2335 #if defined(CONFIG_PROC_FS)
2336 struct igmp_mc_iter_state
{
2337 struct seq_net_private p
;
2338 struct net_device
*dev
;
2339 struct in_device
*in_dev
;
2342 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2344 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2346 struct net
*net
= seq_file_net(seq
);
2347 struct ip_mc_list
*im
= NULL
;
2348 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2350 state
->in_dev
= NULL
;
2351 for_each_netdev_rcu(net
, state
->dev
) {
2352 struct in_device
*in_dev
;
2354 in_dev
= __in_dev_get_rcu(state
->dev
);
2357 im
= rcu_dereference(in_dev
->mc_list
);
2359 state
->in_dev
= in_dev
;
2366 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2368 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2370 im
= rcu_dereference(im
->next_rcu
);
2372 state
->dev
= next_net_device_rcu(state
->dev
);
2374 state
->in_dev
= NULL
;
2377 state
->in_dev
= __in_dev_get_rcu(state
->dev
);
2380 im
= rcu_dereference(state
->in_dev
->mc_list
);
2385 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2387 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2389 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2391 return pos
? NULL
: im
;
2394 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2398 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2401 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2403 struct ip_mc_list
*im
;
2404 if (v
== SEQ_START_TOKEN
)
2405 im
= igmp_mc_get_first(seq
);
2407 im
= igmp_mc_get_next(seq
, v
);
2412 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2415 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2417 state
->in_dev
= NULL
;
2422 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2424 if (v
== SEQ_START_TOKEN
)
2426 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2428 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2429 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2431 #ifdef CONFIG_IP_MULTICAST
2432 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2433 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2439 if (rcu_dereference(state
->in_dev
->mc_list
) == im
) {
2440 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2441 state
->dev
->ifindex
, state
->dev
->name
, state
->in_dev
->mc_count
, querier
);
2445 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2446 im
->multiaddr
, im
->users
,
2447 im
->tm_running
, im
->tm_running
?
2448 jiffies_to_clock_t(im
->timer
.expires
-jiffies
) : 0,
2454 static const struct seq_operations igmp_mc_seq_ops
= {
2455 .start
= igmp_mc_seq_start
,
2456 .next
= igmp_mc_seq_next
,
2457 .stop
= igmp_mc_seq_stop
,
2458 .show
= igmp_mc_seq_show
,
2461 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2463 return seq_open_net(inode
, file
, &igmp_mc_seq_ops
,
2464 sizeof(struct igmp_mc_iter_state
));
2467 static const struct file_operations igmp_mc_seq_fops
= {
2468 .owner
= THIS_MODULE
,
2469 .open
= igmp_mc_seq_open
,
2471 .llseek
= seq_lseek
,
2472 .release
= seq_release_net
,
2475 struct igmp_mcf_iter_state
{
2476 struct seq_net_private p
;
2477 struct net_device
*dev
;
2478 struct in_device
*idev
;
2479 struct ip_mc_list
*im
;
2482 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2484 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2486 struct net
*net
= seq_file_net(seq
);
2487 struct ip_sf_list
*psf
= NULL
;
2488 struct ip_mc_list
*im
= NULL
;
2489 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2493 for_each_netdev_rcu(net
, state
->dev
) {
2494 struct in_device
*idev
;
2495 idev
= __in_dev_get_rcu(state
->dev
);
2496 if (unlikely(idev
== NULL
))
2498 im
= rcu_dereference(idev
->mc_list
);
2499 if (likely(im
!= NULL
)) {
2500 spin_lock_bh(&im
->lock
);
2502 if (likely(psf
!= NULL
)) {
2507 spin_unlock_bh(&im
->lock
);
2513 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2515 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2519 spin_unlock_bh(&state
->im
->lock
);
2520 state
->im
= state
->im
->next
;
2521 while (!state
->im
) {
2522 state
->dev
= next_net_device_rcu(state
->dev
);
2527 state
->idev
= __in_dev_get_rcu(state
->dev
);
2530 state
->im
= rcu_dereference(state
->idev
->mc_list
);
2534 spin_lock_bh(&state
->im
->lock
);
2535 psf
= state
->im
->sources
;
2541 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2543 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2545 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2547 return pos
? NULL
: psf
;
2550 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2554 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2557 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2559 struct ip_sf_list
*psf
;
2560 if (v
== SEQ_START_TOKEN
)
2561 psf
= igmp_mcf_get_first(seq
);
2563 psf
= igmp_mcf_get_next(seq
, v
);
2568 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2571 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2572 if (likely(state
->im
!= NULL
)) {
2573 spin_unlock_bh(&state
->im
->lock
);
2581 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2583 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2584 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2586 if (v
== SEQ_START_TOKEN
) {
2589 "%10s %10s %6s %6s\n", "Idx",
2591 "SRC", "INC", "EXC");
2595 "0x%08x %6lu %6lu\n",
2596 state
->dev
->ifindex
, state
->dev
->name
,
2597 ntohl(state
->im
->multiaddr
),
2598 ntohl(psf
->sf_inaddr
),
2599 psf
->sf_count
[MCAST_INCLUDE
],
2600 psf
->sf_count
[MCAST_EXCLUDE
]);
2605 static const struct seq_operations igmp_mcf_seq_ops
= {
2606 .start
= igmp_mcf_seq_start
,
2607 .next
= igmp_mcf_seq_next
,
2608 .stop
= igmp_mcf_seq_stop
,
2609 .show
= igmp_mcf_seq_show
,
2612 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2614 return seq_open_net(inode
, file
, &igmp_mcf_seq_ops
,
2615 sizeof(struct igmp_mcf_iter_state
));
2618 static const struct file_operations igmp_mcf_seq_fops
= {
2619 .owner
= THIS_MODULE
,
2620 .open
= igmp_mcf_seq_open
,
2622 .llseek
= seq_lseek
,
2623 .release
= seq_release_net
,
2626 static int __net_init
igmp_net_init(struct net
*net
)
2628 struct proc_dir_entry
*pde
;
2630 pde
= proc_net_fops_create(net
, "igmp", S_IRUGO
, &igmp_mc_seq_fops
);
2633 pde
= proc_net_fops_create(net
, "mcfilter", S_IRUGO
, &igmp_mcf_seq_fops
);
2639 proc_net_remove(net
, "igmp");
2644 static void __net_exit
igmp_net_exit(struct net
*net
)
2646 proc_net_remove(net
, "mcfilter");
2647 proc_net_remove(net
, "igmp");
2650 static struct pernet_operations igmp_net_ops
= {
2651 .init
= igmp_net_init
,
2652 .exit
= igmp_net_exit
,
2655 int __init
igmp_mc_proc_init(void)
2657 return register_pernet_subsys(&igmp_net_ops
);