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 <linux/uaccess.h>
76 #include <linux/types.h>
77 #include <linux/kernel.h>
78 #include <linux/jiffies.h>
79 #include <linux/string.h>
80 #include <linux/socket.h>
81 #include <linux/sockios.h>
83 #include <linux/inet.h>
84 #include <linux/netdevice.h>
85 #include <linux/skbuff.h>
86 #include <linux/inetdevice.h>
87 #include <linux/igmp.h>
88 #include <linux/if_arp.h>
89 #include <linux/rtnetlink.h>
90 #include <linux/times.h>
91 #include <linux/pkt_sched.h>
93 #include <net/net_namespace.h>
96 #include <net/protocol.h>
97 #include <net/route.h>
99 #include <net/checksum.h>
100 #include <net/inet_common.h>
101 #include <linux/netfilter_ipv4.h>
102 #ifdef CONFIG_IP_MROUTE
103 #include <linux/mroute.h>
105 #ifdef CONFIG_PROC_FS
106 #include <linux/proc_fs.h>
107 #include <linux/seq_file.h>
110 #ifdef CONFIG_IP_MULTICAST
111 /* Parameter names and values are taken from igmp-v2-06 draft */
113 #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ)
114 #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ)
115 #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ)
116 #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ)
117 #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ)
118 #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2
121 #define IGMP_INITIAL_REPORT_DELAY (1)
123 /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs!
124 * IGMP specs require to report membership immediately after
125 * joining a group, but we delay the first report by a
126 * small interval. It seems more natural and still does not
127 * contradict to specs provided this delay is small enough.
130 #define IGMP_V1_SEEN(in_dev) \
131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
132 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \
133 ((in_dev)->mr_v1_seen && \
134 time_before(jiffies, (in_dev)->mr_v1_seen)))
135 #define IGMP_V2_SEEN(in_dev) \
136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
137 IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \
138 ((in_dev)->mr_v2_seen && \
139 time_before(jiffies, (in_dev)->mr_v2_seen)))
141 static int unsolicited_report_interval(struct in_device
*in_dev
)
143 int interval_ms
, interval_jiffies
;
145 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
146 interval_ms
= IN_DEV_CONF_GET(
148 IGMPV2_UNSOLICITED_REPORT_INTERVAL
);
150 interval_ms
= IN_DEV_CONF_GET(
152 IGMPV3_UNSOLICITED_REPORT_INTERVAL
);
154 interval_jiffies
= msecs_to_jiffies(interval_ms
);
156 /* _timer functions can't handle a delay of 0 jiffies so ensure
157 * we always return a positive value.
159 if (interval_jiffies
<= 0)
160 interval_jiffies
= 1;
161 return interval_jiffies
;
164 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
);
165 static void igmpv3_del_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
);
166 static void igmpv3_clear_delrec(struct in_device
*in_dev
);
167 static int sf_setstate(struct ip_mc_list
*pmc
);
168 static void sf_markstate(struct ip_mc_list
*pmc
);
170 static void ip_mc_clear_src(struct ip_mc_list
*pmc
);
171 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
172 int sfcount
, __be32
*psfsrc
, int delta
);
174 static void ip_ma_put(struct ip_mc_list
*im
)
176 if (refcount_dec_and_test(&im
->refcnt
)) {
177 in_dev_put(im
->interface
);
182 #define for_each_pmc_rcu(in_dev, pmc) \
183 for (pmc = rcu_dereference(in_dev->mc_list); \
185 pmc = rcu_dereference(pmc->next_rcu))
187 #define for_each_pmc_rtnl(in_dev, pmc) \
188 for (pmc = rtnl_dereference(in_dev->mc_list); \
190 pmc = rtnl_dereference(pmc->next_rcu))
192 #ifdef CONFIG_IP_MULTICAST
198 static void igmp_stop_timer(struct ip_mc_list
*im
)
200 spin_lock_bh(&im
->lock
);
201 if (del_timer(&im
->timer
))
202 refcount_dec(&im
->refcnt
);
205 im
->unsolicit_count
= 0;
206 spin_unlock_bh(&im
->lock
);
209 /* It must be called with locked im->lock */
210 static void igmp_start_timer(struct ip_mc_list
*im
, int max_delay
)
212 int tv
= prandom_u32() % max_delay
;
215 if (!mod_timer(&im
->timer
, jiffies
+tv
+2))
216 refcount_inc(&im
->refcnt
);
219 static void igmp_gq_start_timer(struct in_device
*in_dev
)
221 int tv
= prandom_u32() % in_dev
->mr_maxdelay
;
222 unsigned long exp
= jiffies
+ tv
+ 2;
224 if (in_dev
->mr_gq_running
&&
225 time_after_eq(exp
, (in_dev
->mr_gq_timer
).expires
))
228 in_dev
->mr_gq_running
= 1;
229 if (!mod_timer(&in_dev
->mr_gq_timer
, exp
))
233 static void igmp_ifc_start_timer(struct in_device
*in_dev
, int delay
)
235 int tv
= prandom_u32() % delay
;
237 if (!mod_timer(&in_dev
->mr_ifc_timer
, jiffies
+tv
+2))
241 static void igmp_mod_timer(struct ip_mc_list
*im
, int max_delay
)
243 spin_lock_bh(&im
->lock
);
244 im
->unsolicit_count
= 0;
245 if (del_timer(&im
->timer
)) {
246 if ((long)(im
->timer
.expires
-jiffies
) < max_delay
) {
247 add_timer(&im
->timer
);
249 spin_unlock_bh(&im
->lock
);
252 refcount_dec(&im
->refcnt
);
254 igmp_start_timer(im
, max_delay
);
255 spin_unlock_bh(&im
->lock
);
260 * Send an IGMP report.
263 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
266 static int is_in(struct ip_mc_list
*pmc
, struct ip_sf_list
*psf
, int type
,
267 int gdeleted
, int sdeleted
)
270 case IGMPV3_MODE_IS_INCLUDE
:
271 case IGMPV3_MODE_IS_EXCLUDE
:
272 if (gdeleted
|| sdeleted
)
274 if (!(pmc
->gsquery
&& !psf
->sf_gsresp
)) {
275 if (pmc
->sfmode
== MCAST_INCLUDE
)
277 /* don't include if this source is excluded
280 if (psf
->sf_count
[MCAST_INCLUDE
])
281 return type
== IGMPV3_MODE_IS_INCLUDE
;
282 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
283 psf
->sf_count
[MCAST_EXCLUDE
];
286 case IGMPV3_CHANGE_TO_INCLUDE
:
287 if (gdeleted
|| sdeleted
)
289 return psf
->sf_count
[MCAST_INCLUDE
] != 0;
290 case IGMPV3_CHANGE_TO_EXCLUDE
:
291 if (gdeleted
|| sdeleted
)
293 if (pmc
->sfcount
[MCAST_EXCLUDE
] == 0 ||
294 psf
->sf_count
[MCAST_INCLUDE
])
296 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
297 psf
->sf_count
[MCAST_EXCLUDE
];
298 case IGMPV3_ALLOW_NEW_SOURCES
:
299 if (gdeleted
|| !psf
->sf_crcount
)
301 return (pmc
->sfmode
== MCAST_INCLUDE
) ^ sdeleted
;
302 case IGMPV3_BLOCK_OLD_SOURCES
:
303 if (pmc
->sfmode
== MCAST_INCLUDE
)
304 return gdeleted
|| (psf
->sf_crcount
&& sdeleted
);
305 return psf
->sf_crcount
&& !gdeleted
&& !sdeleted
;
311 igmp_scount(struct ip_mc_list
*pmc
, int type
, int gdeleted
, int sdeleted
)
313 struct ip_sf_list
*psf
;
316 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
317 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
))
324 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, unsigned int mtu
)
329 struct igmpv3_report
*pig
;
330 struct net
*net
= dev_net(dev
);
332 int hlen
= LL_RESERVED_SPACE(dev
);
333 int tlen
= dev
->needed_tailroom
;
334 unsigned int size
= mtu
;
337 skb
= alloc_skb(size
+ hlen
+ tlen
,
338 GFP_ATOMIC
| __GFP_NOWARN
);
345 skb
->priority
= TC_PRIO_CONTROL
;
347 rt
= ip_route_output_ports(net
, &fl4
, NULL
, IGMPV3_ALL_MCR
, 0,
349 IPPROTO_IGMP
, 0, dev
->ifindex
);
355 skb_dst_set(skb
, &rt
->dst
);
358 skb_reserve(skb
, hlen
);
359 skb_tailroom_reserve(skb
, mtu
, tlen
);
361 skb_reset_network_header(skb
);
363 skb_put(skb
, sizeof(struct iphdr
) + 4);
366 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
368 pip
->frag_off
= htons(IP_DF
);
370 pip
->daddr
= fl4
.daddr
;
371 pip
->saddr
= fl4
.saddr
;
372 pip
->protocol
= IPPROTO_IGMP
;
373 pip
->tot_len
= 0; /* filled in later */
374 ip_select_ident(net
, skb
, NULL
);
375 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
376 ((u8
*)&pip
[1])[1] = 4;
377 ((u8
*)&pip
[1])[2] = 0;
378 ((u8
*)&pip
[1])[3] = 0;
380 skb
->transport_header
= skb
->network_header
+ sizeof(struct iphdr
) + 4;
381 skb_put(skb
, sizeof(*pig
));
382 pig
= igmpv3_report_hdr(skb
);
383 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
391 static int igmpv3_sendpack(struct sk_buff
*skb
)
393 struct igmphdr
*pig
= igmp_hdr(skb
);
394 const int igmplen
= skb_tail_pointer(skb
) - skb_transport_header(skb
);
396 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
398 return ip_local_out(dev_net(skb_dst(skb
)->dev
), skb
->sk
, skb
);
401 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
403 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
, type
, gdel
, sdel
);
406 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
407 int type
, struct igmpv3_grec
**ppgr
)
409 struct net_device
*dev
= pmc
->interface
->dev
;
410 struct igmpv3_report
*pih
;
411 struct igmpv3_grec
*pgr
;
414 skb
= igmpv3_newpack(dev
, dev
->mtu
);
417 pgr
= skb_put(skb
, sizeof(struct igmpv3_grec
));
418 pgr
->grec_type
= type
;
419 pgr
->grec_auxwords
= 0;
421 pgr
->grec_mca
= pmc
->multiaddr
;
422 pih
= igmpv3_report_hdr(skb
);
423 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
428 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
430 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
431 int type
, int gdeleted
, int sdeleted
)
433 struct net_device
*dev
= pmc
->interface
->dev
;
434 struct net
*net
= dev_net(dev
);
435 struct igmpv3_report
*pih
;
436 struct igmpv3_grec
*pgr
= NULL
;
437 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
438 int scount
, stotal
, first
, isquery
, truncate
;
440 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
442 if (ipv4_is_local_multicast(pmc
->multiaddr
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
445 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
446 type
== IGMPV3_MODE_IS_EXCLUDE
;
447 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
448 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
452 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
457 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
459 /* EX and TO_EX get a fresh packet, if needed */
461 if (pih
&& pih
->ngrec
&&
462 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
464 igmpv3_sendpack(skb
);
465 skb
= igmpv3_newpack(dev
, dev
->mtu
);
470 for (psf
= *psf_list
; psf
; psf
= psf_next
) {
473 psf_next
= psf
->sf_next
;
475 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
480 /* Based on RFC3376 5.1. Should not send source-list change
481 * records when there is a filter mode change.
483 if (((gdeleted
&& pmc
->sfmode
== MCAST_EXCLUDE
) ||
484 (!gdeleted
&& pmc
->crcount
)) &&
485 (type
== IGMPV3_ALLOW_NEW_SOURCES
||
486 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
)
487 goto decrease_sf_crcount
;
489 /* clear marks on query responses */
493 if (AVAILABLE(skb
) < sizeof(__be32
) +
494 first
*sizeof(struct igmpv3_grec
)) {
495 if (truncate
&& !first
)
496 break; /* truncate these */
498 pgr
->grec_nsrcs
= htons(scount
);
500 igmpv3_sendpack(skb
);
501 skb
= igmpv3_newpack(dev
, dev
->mtu
);
506 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
511 psrc
= skb_put(skb
, sizeof(__be32
));
512 *psrc
= psf
->sf_inaddr
;
514 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
515 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
518 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
520 psf_prev
->sf_next
= psf
->sf_next
;
522 *psf_list
= psf
->sf_next
;
532 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
533 type
== IGMPV3_BLOCK_OLD_SOURCES
)
535 if (pmc
->crcount
|| isquery
) {
536 /* make sure we have room for group header */
537 if (skb
&& AVAILABLE(skb
) < sizeof(struct igmpv3_grec
)) {
538 igmpv3_sendpack(skb
);
539 skb
= NULL
; /* add_grhead will get a new one */
541 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
545 pgr
->grec_nsrcs
= htons(scount
);
548 pmc
->gsquery
= 0; /* clear query state on report */
552 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
554 struct sk_buff
*skb
= NULL
;
555 struct net
*net
= dev_net(in_dev
->dev
);
560 for_each_pmc_rcu(in_dev
, pmc
) {
561 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
563 if (ipv4_is_local_multicast(pmc
->multiaddr
) &&
564 !net
->ipv4
.sysctl_igmp_llm_reports
)
566 spin_lock_bh(&pmc
->lock
);
567 if (pmc
->sfcount
[MCAST_EXCLUDE
])
568 type
= IGMPV3_MODE_IS_EXCLUDE
;
570 type
= IGMPV3_MODE_IS_INCLUDE
;
571 skb
= add_grec(skb
, pmc
, type
, 0, 0);
572 spin_unlock_bh(&pmc
->lock
);
576 spin_lock_bh(&pmc
->lock
);
577 if (pmc
->sfcount
[MCAST_EXCLUDE
])
578 type
= IGMPV3_MODE_IS_EXCLUDE
;
580 type
= IGMPV3_MODE_IS_INCLUDE
;
581 skb
= add_grec(skb
, pmc
, type
, 0, 0);
582 spin_unlock_bh(&pmc
->lock
);
586 return igmpv3_sendpack(skb
);
590 * remove zero-count source records from a source filter list
592 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
594 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
597 for (psf
= *ppsf
; psf
; psf
= psf_next
) {
598 psf_next
= psf
->sf_next
;
599 if (psf
->sf_crcount
== 0) {
601 psf_prev
->sf_next
= psf
->sf_next
;
603 *ppsf
= psf
->sf_next
;
610 static void igmpv3_send_cr(struct in_device
*in_dev
)
612 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
613 struct sk_buff
*skb
= NULL
;
617 spin_lock_bh(&in_dev
->mc_tomb_lock
);
621 for (pmc
= in_dev
->mc_tomb
; pmc
; pmc
= pmc_next
) {
622 pmc_next
= pmc
->next
;
623 if (pmc
->sfmode
== MCAST_INCLUDE
) {
624 type
= IGMPV3_BLOCK_OLD_SOURCES
;
625 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
626 skb
= add_grec(skb
, pmc
, type
, 1, 0);
627 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
630 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
631 type
= IGMPV3_CHANGE_TO_INCLUDE
;
632 skb
= add_grec(skb
, pmc
, type
, 1, 0);
635 if (pmc
->crcount
== 0) {
636 igmpv3_clear_zeros(&pmc
->tomb
);
637 igmpv3_clear_zeros(&pmc
->sources
);
640 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
642 pmc_prev
->next
= pmc_next
;
644 in_dev
->mc_tomb
= pmc_next
;
645 in_dev_put(pmc
->interface
);
650 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
653 for_each_pmc_rcu(in_dev
, pmc
) {
654 spin_lock_bh(&pmc
->lock
);
655 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
656 type
= IGMPV3_BLOCK_OLD_SOURCES
;
657 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
659 type
= IGMPV3_ALLOW_NEW_SOURCES
;
660 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
662 skb
= add_grec(skb
, pmc
, type
, 0, 0);
663 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
665 /* filter mode changes */
667 if (pmc
->sfmode
== MCAST_EXCLUDE
)
668 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
670 type
= IGMPV3_CHANGE_TO_INCLUDE
;
671 skb
= add_grec(skb
, pmc
, type
, 0, 0);
674 spin_unlock_bh(&pmc
->lock
);
680 (void) igmpv3_sendpack(skb
);
683 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
690 struct net_device
*dev
= in_dev
->dev
;
691 struct net
*net
= dev_net(dev
);
692 __be32 group
= pmc
? pmc
->multiaddr
: 0;
697 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
698 return igmpv3_send_report(in_dev
, pmc
);
700 if (ipv4_is_local_multicast(group
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
703 if (type
== IGMP_HOST_LEAVE_MESSAGE
)
704 dst
= IGMP_ALL_ROUTER
;
708 rt
= ip_route_output_ports(net
, &fl4
, NULL
, dst
, 0,
710 IPPROTO_IGMP
, 0, dev
->ifindex
);
714 hlen
= LL_RESERVED_SPACE(dev
);
715 tlen
= dev
->needed_tailroom
;
716 skb
= alloc_skb(IGMP_SIZE
+ hlen
+ tlen
, GFP_ATOMIC
);
721 skb
->priority
= TC_PRIO_CONTROL
;
723 skb_dst_set(skb
, &rt
->dst
);
725 skb_reserve(skb
, hlen
);
727 skb_reset_network_header(skb
);
729 skb_put(skb
, sizeof(struct iphdr
) + 4);
732 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
734 iph
->frag_off
= htons(IP_DF
);
737 iph
->saddr
= fl4
.saddr
;
738 iph
->protocol
= IPPROTO_IGMP
;
739 ip_select_ident(net
, skb
, NULL
);
740 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
741 ((u8
*)&iph
[1])[1] = 4;
742 ((u8
*)&iph
[1])[2] = 0;
743 ((u8
*)&iph
[1])[3] = 0;
745 ih
= skb_put(skb
, sizeof(struct igmphdr
));
750 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
752 return ip_local_out(net
, skb
->sk
, skb
);
755 static void igmp_gq_timer_expire(unsigned long data
)
757 struct in_device
*in_dev
= (struct in_device
*)data
;
759 in_dev
->mr_gq_running
= 0;
760 igmpv3_send_report(in_dev
, NULL
);
764 static void igmp_ifc_timer_expire(unsigned long data
)
766 struct in_device
*in_dev
= (struct in_device
*)data
;
768 igmpv3_send_cr(in_dev
);
769 if (in_dev
->mr_ifc_count
) {
770 in_dev
->mr_ifc_count
--;
771 igmp_ifc_start_timer(in_dev
,
772 unsolicited_report_interval(in_dev
));
777 static void igmp_ifc_event(struct in_device
*in_dev
)
779 struct net
*net
= dev_net(in_dev
->dev
);
780 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
782 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
783 igmp_ifc_start_timer(in_dev
, 1);
787 static void igmp_timer_expire(unsigned long data
)
789 struct ip_mc_list
*im
= (struct ip_mc_list
*)data
;
790 struct in_device
*in_dev
= im
->interface
;
792 spin_lock(&im
->lock
);
795 if (im
->unsolicit_count
) {
796 im
->unsolicit_count
--;
797 igmp_start_timer(im
, unsolicited_report_interval(in_dev
));
800 spin_unlock(&im
->lock
);
802 if (IGMP_V1_SEEN(in_dev
))
803 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
804 else if (IGMP_V2_SEEN(in_dev
))
805 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
807 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
812 /* mark EXCLUDE-mode sources */
813 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
815 struct ip_sf_list
*psf
;
819 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
822 for (i
= 0; i
< nsrcs
; i
++) {
823 /* skip inactive filters */
824 if (psf
->sf_count
[MCAST_INCLUDE
] ||
825 pmc
->sfcount
[MCAST_EXCLUDE
] !=
826 psf
->sf_count
[MCAST_EXCLUDE
])
828 if (srcs
[i
] == psf
->sf_inaddr
) {
835 if (scount
== nsrcs
) /* all sources excluded */
840 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
842 struct ip_sf_list
*psf
;
845 if (pmc
->sfmode
== MCAST_EXCLUDE
)
846 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
848 /* mark INCLUDE-mode sources */
850 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
853 for (i
= 0; i
< nsrcs
; i
++)
854 if (srcs
[i
] == psf
->sf_inaddr
) {
868 /* return true if packet was dropped */
869 static bool igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
871 struct ip_mc_list
*im
;
872 struct net
*net
= dev_net(in_dev
->dev
);
874 /* Timers are only set for non-local groups */
876 if (group
== IGMP_ALL_HOSTS
)
878 if (ipv4_is_local_multicast(group
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
882 for_each_pmc_rcu(in_dev
, im
) {
883 if (im
->multiaddr
== group
) {
892 /* return true if packet was dropped */
893 static bool igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
896 struct igmphdr
*ih
= igmp_hdr(skb
);
897 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
898 struct ip_mc_list
*im
;
899 __be32 group
= ih
->group
;
902 struct net
*net
= dev_net(in_dev
->dev
);
907 /* Alas, old v1 router presents here. */
909 max_delay
= IGMP_QUERY_RESPONSE_INTERVAL
;
910 in_dev
->mr_v1_seen
= jiffies
+
911 IGMP_V1_ROUTER_PRESENT_TIMEOUT
;
914 /* v2 router present */
915 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
916 in_dev
->mr_v2_seen
= jiffies
+
917 IGMP_V2_ROUTER_PRESENT_TIMEOUT
;
919 /* cancel the interface change timer */
920 in_dev
->mr_ifc_count
= 0;
921 if (del_timer(&in_dev
->mr_ifc_timer
))
922 __in_dev_put(in_dev
);
923 /* clear deleted report items */
924 igmpv3_clear_delrec(in_dev
);
925 } else if (len
< 12) {
926 return true; /* ignore bogus packet; freed by caller */
927 } else if (IGMP_V1_SEEN(in_dev
)) {
928 /* This is a v3 query with v1 queriers present */
929 max_delay
= IGMP_QUERY_RESPONSE_INTERVAL
;
931 } else if (IGMP_V2_SEEN(in_dev
)) {
932 /* this is a v3 query with v2 queriers present;
933 * Interpretation of the max_delay code is problematic here.
934 * A real v2 host would use ih_code directly, while v3 has a
935 * different encoding. We use the v3 encoding as more likely
936 * to be intended in a v3 query.
938 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
940 max_delay
= 1; /* can't mod w/ 0 */
942 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
945 ih3
= igmpv3_query_hdr(skb
);
947 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
948 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
950 ih3
= igmpv3_query_hdr(skb
);
953 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
955 max_delay
= 1; /* can't mod w/ 0 */
956 in_dev
->mr_maxdelay
= max_delay
;
958 in_dev
->mr_qrv
= ih3
->qrv
;
959 if (!group
) { /* general query */
961 return true; /* no sources allowed */
962 igmp_gq_start_timer(in_dev
);
965 /* mark sources to include, if group & source-specific */
966 mark
= ih3
->nsrcs
!= 0;
970 * - Start the timers in all of our membership records
971 * that the query applies to for the interface on
972 * which the query arrived excl. those that belong
973 * to a "local" group (224.0.0.X)
974 * - For timers already running check if they need to
976 * - Use the igmp->igmp_code field as the maximum
980 for_each_pmc_rcu(in_dev
, im
) {
983 if (group
&& group
!= im
->multiaddr
)
985 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
987 if (ipv4_is_local_multicast(im
->multiaddr
) &&
988 !net
->ipv4
.sysctl_igmp_llm_reports
)
990 spin_lock_bh(&im
->lock
);
992 im
->gsquery
= im
->gsquery
&& mark
;
995 changed
= !im
->gsquery
||
996 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
997 spin_unlock_bh(&im
->lock
);
999 igmp_mod_timer(im
, max_delay
);
1005 /* called in rcu_read_lock() section */
1006 int igmp_rcv(struct sk_buff
*skb
)
1008 /* This basically follows the spec line by line -- see RFC1112 */
1010 struct net_device
*dev
= skb
->dev
;
1011 struct in_device
*in_dev
;
1013 bool dropped
= true;
1015 if (netif_is_l3_master(dev
)) {
1016 dev
= dev_get_by_index_rcu(dev_net(dev
), IPCB(skb
)->iif
);
1021 in_dev
= __in_dev_get_rcu(dev
);
1025 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
1028 if (skb_checksum_simple_validate(skb
))
1033 case IGMP_HOST_MEMBERSHIP_QUERY
:
1034 dropped
= igmp_heard_query(in_dev
, skb
, len
);
1036 case IGMP_HOST_MEMBERSHIP_REPORT
:
1037 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1038 /* Is it our report looped back? */
1039 if (rt_is_output_route(skb_rtable(skb
)))
1041 /* don't rely on MC router hearing unicast reports */
1042 if (skb
->pkt_type
== PACKET_MULTICAST
||
1043 skb
->pkt_type
== PACKET_BROADCAST
)
1044 dropped
= igmp_heard_report(in_dev
, ih
->group
);
1047 #ifdef CONFIG_IP_PIMSM_V1
1048 return pim_rcv_v1(skb
);
1050 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1053 case IGMP_HOST_LEAVE_MESSAGE
:
1055 case IGMP_MTRACE_RESP
:
1073 * Add a filter to a device
1076 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
1078 char buf
[MAX_ADDR_LEN
];
1079 struct net_device
*dev
= in_dev
->dev
;
1081 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1082 We will get multicast token leakage, when IFF_MULTICAST
1083 is changed. This check should be done in ndo_set_rx_mode
1084 routine. Something sort of:
1085 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1088 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1089 dev_mc_add(dev
, buf
);
1093 * Remove a filter from a device
1096 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1098 char buf
[MAX_ADDR_LEN
];
1099 struct net_device
*dev
= in_dev
->dev
;
1101 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1102 dev_mc_del(dev
, buf
);
1105 #ifdef CONFIG_IP_MULTICAST
1107 * deleted ip_mc_list manipulation
1109 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1111 struct ip_mc_list
*pmc
;
1112 struct net
*net
= dev_net(in_dev
->dev
);
1114 /* this is an "ip_mc_list" for convenience; only the fields below
1115 * are actually used. In particular, the refcnt and users are not
1116 * used for management of the delete list. Using the same structure
1117 * for deleted items allows change reports to use common code with
1118 * non-deleted or query-response MCA's.
1120 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1123 spin_lock_init(&pmc
->lock
);
1124 spin_lock_bh(&im
->lock
);
1125 pmc
->interface
= im
->interface
;
1126 in_dev_hold(in_dev
);
1127 pmc
->multiaddr
= im
->multiaddr
;
1128 pmc
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1129 pmc
->sfmode
= im
->sfmode
;
1130 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1131 struct ip_sf_list
*psf
;
1133 pmc
->tomb
= im
->tomb
;
1134 pmc
->sources
= im
->sources
;
1135 im
->tomb
= im
->sources
= NULL
;
1136 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1137 psf
->sf_crcount
= pmc
->crcount
;
1139 spin_unlock_bh(&im
->lock
);
1141 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1142 pmc
->next
= in_dev
->mc_tomb
;
1143 in_dev
->mc_tomb
= pmc
;
1144 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1148 * restore ip_mc_list deleted records
1150 static void igmpv3_del_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1152 struct ip_mc_list
*pmc
, *pmc_prev
;
1153 struct ip_sf_list
*psf
;
1154 struct net
*net
= dev_net(in_dev
->dev
);
1155 __be32 multiaddr
= im
->multiaddr
;
1157 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1159 for (pmc
= in_dev
->mc_tomb
; pmc
; pmc
= pmc
->next
) {
1160 if (pmc
->multiaddr
== multiaddr
)
1166 pmc_prev
->next
= pmc
->next
;
1168 in_dev
->mc_tomb
= pmc
->next
;
1170 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1172 spin_lock_bh(&im
->lock
);
1174 im
->interface
= pmc
->interface
;
1175 im
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1176 im
->sfmode
= pmc
->sfmode
;
1177 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1178 im
->tomb
= pmc
->tomb
;
1179 im
->sources
= pmc
->sources
;
1180 for (psf
= im
->sources
; psf
; psf
= psf
->sf_next
)
1181 psf
->sf_crcount
= im
->crcount
;
1183 in_dev_put(pmc
->interface
);
1186 spin_unlock_bh(&im
->lock
);
1190 * flush ip_mc_list deleted records
1192 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1194 struct ip_mc_list
*pmc
, *nextpmc
;
1196 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1197 pmc
= in_dev
->mc_tomb
;
1198 in_dev
->mc_tomb
= NULL
;
1199 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1201 for (; pmc
; pmc
= nextpmc
) {
1202 nextpmc
= pmc
->next
;
1203 ip_mc_clear_src(pmc
);
1204 in_dev_put(pmc
->interface
);
1207 /* clear dead sources, too */
1209 for_each_pmc_rcu(in_dev
, pmc
) {
1210 struct ip_sf_list
*psf
, *psf_next
;
1212 spin_lock_bh(&pmc
->lock
);
1215 spin_unlock_bh(&pmc
->lock
);
1216 for (; psf
; psf
= psf_next
) {
1217 psf_next
= psf
->sf_next
;
1225 static void igmp_group_dropped(struct ip_mc_list
*im
)
1227 struct in_device
*in_dev
= im
->interface
;
1228 #ifdef CONFIG_IP_MULTICAST
1229 struct net
*net
= dev_net(in_dev
->dev
);
1235 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1238 #ifdef CONFIG_IP_MULTICAST
1239 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1241 if (ipv4_is_local_multicast(im
->multiaddr
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
1244 reporter
= im
->reporter
;
1245 igmp_stop_timer(im
);
1247 if (!in_dev
->dead
) {
1248 if (IGMP_V1_SEEN(in_dev
))
1250 if (IGMP_V2_SEEN(in_dev
)) {
1252 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1256 igmpv3_add_delrec(in_dev
, im
);
1258 igmp_ifc_event(in_dev
);
1263 static void igmp_group_added(struct ip_mc_list
*im
)
1265 struct in_device
*in_dev
= im
->interface
;
1266 #ifdef CONFIG_IP_MULTICAST
1267 struct net
*net
= dev_net(in_dev
->dev
);
1270 if (im
->loaded
== 0) {
1272 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1275 #ifdef CONFIG_IP_MULTICAST
1276 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1278 if (ipv4_is_local_multicast(im
->multiaddr
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
1283 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1284 spin_lock_bh(&im
->lock
);
1285 igmp_start_timer(im
, IGMP_INITIAL_REPORT_DELAY
);
1286 spin_unlock_bh(&im
->lock
);
1291 im
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1292 igmp_ifc_event(in_dev
);
1298 * Multicast list managers
1301 static u32
ip_mc_hash(const struct ip_mc_list
*im
)
1303 return hash_32((__force u32
)im
->multiaddr
, MC_HASH_SZ_LOG
);
1306 static void ip_mc_hash_add(struct in_device
*in_dev
,
1307 struct ip_mc_list
*im
)
1309 struct ip_mc_list __rcu
**mc_hash
;
1312 mc_hash
= rtnl_dereference(in_dev
->mc_hash
);
1314 hash
= ip_mc_hash(im
);
1315 im
->next_hash
= mc_hash
[hash
];
1316 rcu_assign_pointer(mc_hash
[hash
], im
);
1320 /* do not use a hash table for small number of items */
1321 if (in_dev
->mc_count
< 4)
1324 mc_hash
= kzalloc(sizeof(struct ip_mc_list
*) << MC_HASH_SZ_LOG
,
1329 for_each_pmc_rtnl(in_dev
, im
) {
1330 hash
= ip_mc_hash(im
);
1331 im
->next_hash
= mc_hash
[hash
];
1332 RCU_INIT_POINTER(mc_hash
[hash
], im
);
1335 rcu_assign_pointer(in_dev
->mc_hash
, mc_hash
);
1338 static void ip_mc_hash_remove(struct in_device
*in_dev
,
1339 struct ip_mc_list
*im
)
1341 struct ip_mc_list __rcu
**mc_hash
= rtnl_dereference(in_dev
->mc_hash
);
1342 struct ip_mc_list
*aux
;
1346 mc_hash
+= ip_mc_hash(im
);
1347 while ((aux
= rtnl_dereference(*mc_hash
)) != im
)
1348 mc_hash
= &aux
->next_hash
;
1349 *mc_hash
= im
->next_hash
;
1354 * A socket has joined a multicast group on device dev.
1357 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1359 struct ip_mc_list
*im
;
1360 #ifdef CONFIG_IP_MULTICAST
1361 struct net
*net
= dev_net(in_dev
->dev
);
1366 for_each_pmc_rtnl(in_dev
, im
) {
1367 if (im
->multiaddr
== addr
) {
1369 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1374 im
= kzalloc(sizeof(*im
), GFP_KERNEL
);
1379 im
->interface
= in_dev
;
1380 in_dev_hold(in_dev
);
1381 im
->multiaddr
= addr
;
1382 /* initial mode is (EX, empty) */
1383 im
->sfmode
= MCAST_EXCLUDE
;
1384 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1385 refcount_set(&im
->refcnt
, 1);
1386 spin_lock_init(&im
->lock
);
1387 #ifdef CONFIG_IP_MULTICAST
1388 setup_timer(&im
->timer
, igmp_timer_expire
, (unsigned long)im
);
1389 im
->unsolicit_count
= net
->ipv4
.sysctl_igmp_qrv
;
1392 im
->next_rcu
= in_dev
->mc_list
;
1394 rcu_assign_pointer(in_dev
->mc_list
, im
);
1396 ip_mc_hash_add(in_dev
, im
);
1398 #ifdef CONFIG_IP_MULTICAST
1399 igmpv3_del_delrec(in_dev
, im
);
1401 igmp_group_added(im
);
1403 ip_rt_multicast_event(in_dev
);
1407 EXPORT_SYMBOL(ip_mc_inc_group
);
1409 static int ip_mc_check_iphdr(struct sk_buff
*skb
)
1411 const struct iphdr
*iph
;
1413 unsigned int offset
= skb_network_offset(skb
) + sizeof(*iph
);
1415 if (!pskb_may_pull(skb
, offset
))
1420 if (iph
->version
!= 4 || ip_hdrlen(skb
) < sizeof(*iph
))
1423 offset
+= ip_hdrlen(skb
) - sizeof(*iph
);
1425 if (!pskb_may_pull(skb
, offset
))
1430 if (unlikely(ip_fast_csum((u8
*)iph
, iph
->ihl
)))
1433 len
= skb_network_offset(skb
) + ntohs(iph
->tot_len
);
1434 if (skb
->len
< len
|| len
< offset
)
1437 skb_set_transport_header(skb
, offset
);
1442 static int ip_mc_check_igmp_reportv3(struct sk_buff
*skb
)
1444 unsigned int len
= skb_transport_offset(skb
);
1446 len
+= sizeof(struct igmpv3_report
);
1448 return pskb_may_pull(skb
, len
) ? 0 : -EINVAL
;
1451 static int ip_mc_check_igmp_query(struct sk_buff
*skb
)
1453 unsigned int len
= skb_transport_offset(skb
);
1455 len
+= sizeof(struct igmphdr
);
1460 if (skb
->len
!= len
) {
1462 len
+= sizeof(struct igmpv3_query
) - sizeof(struct igmphdr
);
1463 if (skb
->len
< len
|| !pskb_may_pull(skb
, len
))
1467 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1468 * all-systems destination addresses (224.0.0.1) for general queries
1470 if (!igmp_hdr(skb
)->group
&&
1471 ip_hdr(skb
)->daddr
!= htonl(INADDR_ALLHOSTS_GROUP
))
1477 static int ip_mc_check_igmp_msg(struct sk_buff
*skb
)
1479 switch (igmp_hdr(skb
)->type
) {
1480 case IGMP_HOST_LEAVE_MESSAGE
:
1481 case IGMP_HOST_MEMBERSHIP_REPORT
:
1482 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1485 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1486 return ip_mc_check_igmp_reportv3(skb
);
1487 case IGMP_HOST_MEMBERSHIP_QUERY
:
1488 return ip_mc_check_igmp_query(skb
);
1494 static inline __sum16
ip_mc_validate_checksum(struct sk_buff
*skb
)
1496 return skb_checksum_simple_validate(skb
);
1499 static int __ip_mc_check_igmp(struct sk_buff
*skb
, struct sk_buff
**skb_trimmed
)
1502 struct sk_buff
*skb_chk
;
1503 unsigned int transport_len
;
1504 unsigned int len
= skb_transport_offset(skb
) + sizeof(struct igmphdr
);
1507 transport_len
= ntohs(ip_hdr(skb
)->tot_len
) - ip_hdrlen(skb
);
1509 skb_chk
= skb_checksum_trimmed(skb
, transport_len
,
1510 ip_mc_validate_checksum
);
1514 if (!pskb_may_pull(skb_chk
, len
))
1517 ret
= ip_mc_check_igmp_msg(skb_chk
);
1522 *skb_trimmed
= skb_chk
;
1523 /* free now unneeded clone */
1524 else if (skb_chk
!= skb
)
1530 if (ret
&& skb_chk
&& skb_chk
!= skb
)
1537 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1538 * @skb: the skb to validate
1539 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1541 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1542 * skb transport header accordingly and returns zero.
1544 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1546 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1547 * -ENOMEM: A memory allocation failure happened.
1549 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1550 * to NULL): After parsing an IGMP packet successfully it will point to
1551 * an skb which has its tail aligned to the IP packet end. This might
1552 * either be the originally provided skb or a trimmed, cloned version if
1553 * the skb frame had data beyond the IP packet. A cloned skb allows us
1554 * to leave the original skb and its full frame unchanged (which might be
1555 * desirable for layer 2 frame jugglers).
1557 * Caller needs to set the skb network header and free any returned skb if it
1558 * differs from the provided skb.
1560 int ip_mc_check_igmp(struct sk_buff
*skb
, struct sk_buff
**skb_trimmed
)
1562 int ret
= ip_mc_check_iphdr(skb
);
1567 if (ip_hdr(skb
)->protocol
!= IPPROTO_IGMP
)
1570 return __ip_mc_check_igmp(skb
, skb_trimmed
);
1572 EXPORT_SYMBOL(ip_mc_check_igmp
);
1575 * Resend IGMP JOIN report; used by netdev notifier.
1577 static void ip_mc_rejoin_groups(struct in_device
*in_dev
)
1579 #ifdef CONFIG_IP_MULTICAST
1580 struct ip_mc_list
*im
;
1582 struct net
*net
= dev_net(in_dev
->dev
);
1586 for_each_pmc_rtnl(in_dev
, im
) {
1587 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1589 if (ipv4_is_local_multicast(im
->multiaddr
) &&
1590 !net
->ipv4
.sysctl_igmp_llm_reports
)
1593 /* a failover is happening and switches
1594 * must be notified immediately
1596 if (IGMP_V1_SEEN(in_dev
))
1597 type
= IGMP_HOST_MEMBERSHIP_REPORT
;
1598 else if (IGMP_V2_SEEN(in_dev
))
1599 type
= IGMPV2_HOST_MEMBERSHIP_REPORT
;
1601 type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
1602 igmp_send_report(in_dev
, im
, type
);
1608 * A socket has left a multicast group on device dev
1611 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1613 struct ip_mc_list
*i
;
1614 struct ip_mc_list __rcu
**ip
;
1618 for (ip
= &in_dev
->mc_list
;
1619 (i
= rtnl_dereference(*ip
)) != NULL
;
1620 ip
= &i
->next_rcu
) {
1621 if (i
->multiaddr
== addr
) {
1622 if (--i
->users
== 0) {
1623 ip_mc_hash_remove(in_dev
, i
);
1626 igmp_group_dropped(i
);
1630 ip_rt_multicast_event(in_dev
);
1639 EXPORT_SYMBOL(ip_mc_dec_group
);
1641 /* Device changing type */
1643 void ip_mc_unmap(struct in_device
*in_dev
)
1645 struct ip_mc_list
*pmc
;
1649 for_each_pmc_rtnl(in_dev
, pmc
)
1650 igmp_group_dropped(pmc
);
1653 void ip_mc_remap(struct in_device
*in_dev
)
1655 struct ip_mc_list
*pmc
;
1659 for_each_pmc_rtnl(in_dev
, pmc
) {
1660 #ifdef CONFIG_IP_MULTICAST
1661 igmpv3_del_delrec(in_dev
, pmc
);
1663 igmp_group_added(pmc
);
1667 /* Device going down */
1669 void ip_mc_down(struct in_device
*in_dev
)
1671 struct ip_mc_list
*pmc
;
1675 for_each_pmc_rtnl(in_dev
, pmc
)
1676 igmp_group_dropped(pmc
);
1678 #ifdef CONFIG_IP_MULTICAST
1679 in_dev
->mr_ifc_count
= 0;
1680 if (del_timer(&in_dev
->mr_ifc_timer
))
1681 __in_dev_put(in_dev
);
1682 in_dev
->mr_gq_running
= 0;
1683 if (del_timer(&in_dev
->mr_gq_timer
))
1684 __in_dev_put(in_dev
);
1687 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1690 void ip_mc_init_dev(struct in_device
*in_dev
)
1692 #ifdef CONFIG_IP_MULTICAST
1693 struct net
*net
= dev_net(in_dev
->dev
);
1697 #ifdef CONFIG_IP_MULTICAST
1698 setup_timer(&in_dev
->mr_gq_timer
, igmp_gq_timer_expire
,
1699 (unsigned long)in_dev
);
1700 setup_timer(&in_dev
->mr_ifc_timer
, igmp_ifc_timer_expire
,
1701 (unsigned long)in_dev
);
1702 in_dev
->mr_qrv
= net
->ipv4
.sysctl_igmp_qrv
;
1705 spin_lock_init(&in_dev
->mc_tomb_lock
);
1708 /* Device going up */
1710 void ip_mc_up(struct in_device
*in_dev
)
1712 struct ip_mc_list
*pmc
;
1713 #ifdef CONFIG_IP_MULTICAST
1714 struct net
*net
= dev_net(in_dev
->dev
);
1719 #ifdef CONFIG_IP_MULTICAST
1720 in_dev
->mr_qrv
= net
->ipv4
.sysctl_igmp_qrv
;
1722 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1724 for_each_pmc_rtnl(in_dev
, pmc
) {
1725 #ifdef CONFIG_IP_MULTICAST
1726 igmpv3_del_delrec(in_dev
, pmc
);
1728 igmp_group_added(pmc
);
1733 * Device is about to be destroyed: clean up.
1736 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1738 struct ip_mc_list
*i
;
1742 /* Deactivate timers */
1744 #ifdef CONFIG_IP_MULTICAST
1745 igmpv3_clear_delrec(in_dev
);
1748 while ((i
= rtnl_dereference(in_dev
->mc_list
)) != NULL
) {
1749 in_dev
->mc_list
= i
->next_rcu
;
1755 /* RTNL is locked */
1756 static struct in_device
*ip_mc_find_dev(struct net
*net
, struct ip_mreqn
*imr
)
1758 struct net_device
*dev
= NULL
;
1759 struct in_device
*idev
= NULL
;
1761 if (imr
->imr_ifindex
) {
1762 idev
= inetdev_by_index(net
, imr
->imr_ifindex
);
1765 if (imr
->imr_address
.s_addr
) {
1766 dev
= __ip_dev_find(net
, imr
->imr_address
.s_addr
, false);
1772 struct rtable
*rt
= ip_route_output(net
,
1773 imr
->imr_multiaddr
.s_addr
,
1781 imr
->imr_ifindex
= dev
->ifindex
;
1782 idev
= __in_dev_get_rtnl(dev
);
1788 * Join a socket to a group
1791 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1794 struct ip_sf_list
*psf
, *psf_prev
;
1798 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1799 if (psf
->sf_inaddr
== *psfsrc
)
1803 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1804 /* source filter not found, or count wrong => bug */
1807 psf
->sf_count
[sfmode
]--;
1808 if (psf
->sf_count
[sfmode
] == 0) {
1809 ip_rt_multicast_event(pmc
->interface
);
1811 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1812 #ifdef CONFIG_IP_MULTICAST
1813 struct in_device
*in_dev
= pmc
->interface
;
1814 struct net
*net
= dev_net(in_dev
->dev
);
1817 /* no more filters for this source */
1819 psf_prev
->sf_next
= psf
->sf_next
;
1821 pmc
->sources
= psf
->sf_next
;
1822 #ifdef CONFIG_IP_MULTICAST
1823 if (psf
->sf_oldin
&&
1824 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1825 psf
->sf_crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1826 psf
->sf_next
= pmc
->tomb
;
1836 #ifndef CONFIG_IP_MULTICAST
1837 #define igmp_ifc_event(x) do { } while (0)
1840 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1841 int sfcount
, __be32
*psfsrc
, int delta
)
1843 struct ip_mc_list
*pmc
;
1850 for_each_pmc_rcu(in_dev
, pmc
) {
1851 if (*pmca
== pmc
->multiaddr
)
1855 /* MCA not found?? bug */
1859 spin_lock_bh(&pmc
->lock
);
1861 #ifdef CONFIG_IP_MULTICAST
1866 if (!pmc
->sfcount
[sfmode
])
1868 pmc
->sfcount
[sfmode
]--;
1871 for (i
= 0; i
< sfcount
; i
++) {
1872 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1874 changerec
|= rv
> 0;
1878 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1879 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1880 pmc
->sfcount
[MCAST_INCLUDE
]) {
1881 #ifdef CONFIG_IP_MULTICAST
1882 struct ip_sf_list
*psf
;
1883 struct net
*net
= dev_net(in_dev
->dev
);
1886 /* filter mode change */
1887 pmc
->sfmode
= MCAST_INCLUDE
;
1888 #ifdef CONFIG_IP_MULTICAST
1889 pmc
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1890 in_dev
->mr_ifc_count
= pmc
->crcount
;
1891 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1892 psf
->sf_crcount
= 0;
1893 igmp_ifc_event(pmc
->interface
);
1894 } else if (sf_setstate(pmc
) || changerec
) {
1895 igmp_ifc_event(pmc
->interface
);
1899 spin_unlock_bh(&pmc
->lock
);
1904 * Add multicast single-source filter to the interface list
1906 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1909 struct ip_sf_list
*psf
, *psf_prev
;
1912 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1913 if (psf
->sf_inaddr
== *psfsrc
)
1918 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1921 psf
->sf_inaddr
= *psfsrc
;
1923 psf_prev
->sf_next
= psf
;
1927 psf
->sf_count
[sfmode
]++;
1928 if (psf
->sf_count
[sfmode
] == 1) {
1929 ip_rt_multicast_event(pmc
->interface
);
1934 #ifdef CONFIG_IP_MULTICAST
1935 static void sf_markstate(struct ip_mc_list
*pmc
)
1937 struct ip_sf_list
*psf
;
1938 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1940 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1941 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1942 psf
->sf_oldin
= mca_xcount
==
1943 psf
->sf_count
[MCAST_EXCLUDE
] &&
1944 !psf
->sf_count
[MCAST_INCLUDE
];
1946 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1949 static int sf_setstate(struct ip_mc_list
*pmc
)
1951 struct ip_sf_list
*psf
, *dpsf
;
1952 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1953 int qrv
= pmc
->interface
->mr_qrv
;
1957 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1958 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1959 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1960 !psf
->sf_count
[MCAST_INCLUDE
];
1962 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1964 if (!psf
->sf_oldin
) {
1965 struct ip_sf_list
*prev
= NULL
;
1967 for (dpsf
= pmc
->tomb
; dpsf
; dpsf
= dpsf
->sf_next
) {
1968 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1974 prev
->sf_next
= dpsf
->sf_next
;
1976 pmc
->tomb
= dpsf
->sf_next
;
1979 psf
->sf_crcount
= qrv
;
1982 } else if (psf
->sf_oldin
) {
1984 psf
->sf_crcount
= 0;
1986 * add or update "delete" records if an active filter
1989 for (dpsf
= pmc
->tomb
; dpsf
; dpsf
= dpsf
->sf_next
)
1990 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1993 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1997 /* pmc->lock held by callers */
1998 dpsf
->sf_next
= pmc
->tomb
;
2001 dpsf
->sf_crcount
= qrv
;
2010 * Add multicast source filter list to the interface list
2012 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
2013 int sfcount
, __be32
*psfsrc
, int delta
)
2015 struct ip_mc_list
*pmc
;
2022 for_each_pmc_rcu(in_dev
, pmc
) {
2023 if (*pmca
== pmc
->multiaddr
)
2027 /* MCA not found?? bug */
2031 spin_lock_bh(&pmc
->lock
);
2034 #ifdef CONFIG_IP_MULTICAST
2037 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
2039 pmc
->sfcount
[sfmode
]++;
2041 for (i
= 0; i
< sfcount
; i
++) {
2042 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
]);
2050 pmc
->sfcount
[sfmode
]--;
2051 for (j
= 0; j
< i
; j
++)
2052 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[j
]);
2053 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
2054 #ifdef CONFIG_IP_MULTICAST
2055 struct ip_sf_list
*psf
;
2056 struct net
*net
= dev_net(pmc
->interface
->dev
);
2057 in_dev
= pmc
->interface
;
2060 /* filter mode change */
2061 if (pmc
->sfcount
[MCAST_EXCLUDE
])
2062 pmc
->sfmode
= MCAST_EXCLUDE
;
2063 else if (pmc
->sfcount
[MCAST_INCLUDE
])
2064 pmc
->sfmode
= MCAST_INCLUDE
;
2065 #ifdef CONFIG_IP_MULTICAST
2066 /* else no filters; keep old mode for reports */
2068 pmc
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
2069 in_dev
->mr_ifc_count
= pmc
->crcount
;
2070 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
2071 psf
->sf_crcount
= 0;
2072 igmp_ifc_event(in_dev
);
2073 } else if (sf_setstate(pmc
)) {
2074 igmp_ifc_event(in_dev
);
2077 spin_unlock_bh(&pmc
->lock
);
2081 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
2083 struct ip_sf_list
*psf
, *nextpsf
, *tomb
, *sources
;
2085 spin_lock_bh(&pmc
->lock
);
2088 sources
= pmc
->sources
;
2089 pmc
->sources
= NULL
;
2090 pmc
->sfmode
= MCAST_EXCLUDE
;
2091 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
2092 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
2093 spin_unlock_bh(&pmc
->lock
);
2095 for (psf
= tomb
; psf
; psf
= nextpsf
) {
2096 nextpsf
= psf
->sf_next
;
2099 for (psf
= sources
; psf
; psf
= nextpsf
) {
2100 nextpsf
= psf
->sf_next
;
2105 /* Join a multicast group
2108 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
2110 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
2111 struct ip_mc_socklist
*iml
, *i
;
2112 struct in_device
*in_dev
;
2113 struct inet_sock
*inet
= inet_sk(sk
);
2114 struct net
*net
= sock_net(sk
);
2121 if (!ipv4_is_multicast(addr
))
2124 in_dev
= ip_mc_find_dev(net
, imr
);
2132 ifindex
= imr
->imr_ifindex
;
2133 for_each_pmc_rtnl(inet
, i
) {
2134 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
2135 i
->multi
.imr_ifindex
== ifindex
)
2140 if (count
>= net
->ipv4
.sysctl_igmp_max_memberships
)
2142 iml
= sock_kmalloc(sk
, sizeof(*iml
), GFP_KERNEL
);
2146 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
2147 iml
->next_rcu
= inet
->mc_list
;
2149 iml
->sfmode
= MCAST_EXCLUDE
;
2150 rcu_assign_pointer(inet
->mc_list
, iml
);
2151 ip_mc_inc_group(in_dev
, addr
);
2156 EXPORT_SYMBOL(ip_mc_join_group
);
2158 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
2159 struct in_device
*in_dev
)
2161 struct ip_sf_socklist
*psf
= rtnl_dereference(iml
->sflist
);
2165 /* any-source empty exclude case */
2166 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
2167 iml
->sfmode
, 0, NULL
, 0);
2169 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
2170 iml
->sfmode
, psf
->sl_count
, psf
->sl_addr
, 0);
2171 RCU_INIT_POINTER(iml
->sflist
, NULL
);
2172 /* decrease mem now to avoid the memleak warning */
2173 atomic_sub(IP_SFLSIZE(psf
->sl_max
), &sk
->sk_omem_alloc
);
2174 kfree_rcu(psf
, rcu
);
2178 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
2180 struct inet_sock
*inet
= inet_sk(sk
);
2181 struct ip_mc_socklist
*iml
;
2182 struct ip_mc_socklist __rcu
**imlp
;
2183 struct in_device
*in_dev
;
2184 struct net
*net
= sock_net(sk
);
2185 __be32 group
= imr
->imr_multiaddr
.s_addr
;
2187 int ret
= -EADDRNOTAVAIL
;
2191 in_dev
= ip_mc_find_dev(net
, imr
);
2192 if (!imr
->imr_ifindex
&& !imr
->imr_address
.s_addr
&& !in_dev
) {
2196 ifindex
= imr
->imr_ifindex
;
2197 for (imlp
= &inet
->mc_list
;
2198 (iml
= rtnl_dereference(*imlp
)) != NULL
;
2199 imlp
= &iml
->next_rcu
) {
2200 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
2203 if (iml
->multi
.imr_ifindex
!= ifindex
)
2205 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
2206 iml
->multi
.imr_address
.s_addr
)
2209 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2211 *imlp
= iml
->next_rcu
;
2214 ip_mc_dec_group(in_dev
, group
);
2216 /* decrease mem now to avoid the memleak warning */
2217 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2218 kfree_rcu(iml
, rcu
);
2224 EXPORT_SYMBOL(ip_mc_leave_group
);
2226 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
2227 ip_mreq_source
*mreqs
, int ifindex
)
2230 struct ip_mreqn imr
;
2231 __be32 addr
= mreqs
->imr_multiaddr
;
2232 struct ip_mc_socklist
*pmc
;
2233 struct in_device
*in_dev
= NULL
;
2234 struct inet_sock
*inet
= inet_sk(sk
);
2235 struct ip_sf_socklist
*psl
;
2236 struct net
*net
= sock_net(sk
);
2240 if (!ipv4_is_multicast(addr
))
2245 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
2246 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
2247 imr
.imr_ifindex
= ifindex
;
2248 in_dev
= ip_mc_find_dev(net
, &imr
);
2254 err
= -EADDRNOTAVAIL
;
2256 for_each_pmc_rtnl(inet
, pmc
) {
2257 if ((pmc
->multi
.imr_multiaddr
.s_addr
==
2258 imr
.imr_multiaddr
.s_addr
) &&
2259 (pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
))
2262 if (!pmc
) { /* must have a prior join */
2266 /* if a source filter was set, must be the same mode as before */
2268 if (pmc
->sfmode
!= omode
) {
2272 } else if (pmc
->sfmode
!= omode
) {
2273 /* allow mode switches for empty-set filters */
2274 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
2275 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
2277 pmc
->sfmode
= omode
;
2280 psl
= rtnl_dereference(pmc
->sflist
);
2283 goto done
; /* err = -EADDRNOTAVAIL */
2285 for (i
= 0; i
< psl
->sl_count
; i
++) {
2286 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2291 if (rv
) /* source not found */
2292 goto done
; /* err = -EADDRNOTAVAIL */
2294 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2295 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
2300 /* update the interface filter */
2301 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2302 &mreqs
->imr_sourceaddr
, 1);
2304 for (j
= i
+1; j
< psl
->sl_count
; j
++)
2305 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
2310 /* else, add a new source to the filter */
2312 if (psl
&& psl
->sl_count
>= net
->ipv4
.sysctl_igmp_max_msf
) {
2316 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
2317 struct ip_sf_socklist
*newpsl
;
2318 int count
= IP_SFBLOCK
;
2321 count
+= psl
->sl_max
;
2322 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
2327 newpsl
->sl_max
= count
;
2328 newpsl
->sl_count
= count
- IP_SFBLOCK
;
2330 for (i
= 0; i
< psl
->sl_count
; i
++)
2331 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
2332 /* decrease mem now to avoid the memleak warning */
2333 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2334 kfree_rcu(psl
, rcu
);
2336 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2339 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
2340 for (i
= 0; i
< psl
->sl_count
; i
++) {
2341 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2346 if (rv
== 0) /* address already there is an error */
2348 for (j
= psl
->sl_count
-1; j
>= i
; j
--)
2349 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
2350 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
2353 /* update the interface list */
2354 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2355 &mreqs
->imr_sourceaddr
, 1);
2358 err
= ip_mc_leave_group(sk
, &imr
);
2362 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
2365 struct ip_mreqn imr
;
2366 __be32 addr
= msf
->imsf_multiaddr
;
2367 struct ip_mc_socklist
*pmc
;
2368 struct in_device
*in_dev
;
2369 struct inet_sock
*inet
= inet_sk(sk
);
2370 struct ip_sf_socklist
*newpsl
, *psl
;
2371 struct net
*net
= sock_net(sk
);
2374 if (!ipv4_is_multicast(addr
))
2376 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2377 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2382 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2383 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2384 imr
.imr_ifindex
= ifindex
;
2385 in_dev
= ip_mc_find_dev(net
, &imr
);
2392 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2393 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2398 for_each_pmc_rtnl(inet
, pmc
) {
2399 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2400 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2403 if (!pmc
) { /* must have a prior join */
2407 if (msf
->imsf_numsrc
) {
2408 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2414 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2415 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2416 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2417 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2418 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2420 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2425 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2426 msf
->imsf_fmode
, 0, NULL
, 0);
2428 psl
= rtnl_dereference(pmc
->sflist
);
2430 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2431 psl
->sl_count
, psl
->sl_addr
, 0);
2432 /* decrease mem now to avoid the memleak warning */
2433 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2434 kfree_rcu(psl
, rcu
);
2436 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2438 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2439 pmc
->sfmode
= msf
->imsf_fmode
;
2443 err
= ip_mc_leave_group(sk
, &imr
);
2447 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2448 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2450 int err
, len
, count
, copycount
;
2451 struct ip_mreqn imr
;
2452 __be32 addr
= msf
->imsf_multiaddr
;
2453 struct ip_mc_socklist
*pmc
;
2454 struct in_device
*in_dev
;
2455 struct inet_sock
*inet
= inet_sk(sk
);
2456 struct ip_sf_socklist
*psl
;
2457 struct net
*net
= sock_net(sk
);
2461 if (!ipv4_is_multicast(addr
))
2464 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2465 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2466 imr
.imr_ifindex
= 0;
2467 in_dev
= ip_mc_find_dev(net
, &imr
);
2473 err
= -EADDRNOTAVAIL
;
2475 for_each_pmc_rtnl(inet
, pmc
) {
2476 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2477 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2480 if (!pmc
) /* must have a prior join */
2482 msf
->imsf_fmode
= pmc
->sfmode
;
2483 psl
= rtnl_dereference(pmc
->sflist
);
2488 count
= psl
->sl_count
;
2490 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2491 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2492 msf
->imsf_numsrc
= count
;
2493 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2494 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2498 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2505 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2506 struct group_filter __user
*optval
, int __user
*optlen
)
2508 int err
, i
, count
, copycount
;
2509 struct sockaddr_in
*psin
;
2511 struct ip_mc_socklist
*pmc
;
2512 struct inet_sock
*inet
= inet_sk(sk
);
2513 struct ip_sf_socklist
*psl
;
2517 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2518 if (psin
->sin_family
!= AF_INET
)
2520 addr
= psin
->sin_addr
.s_addr
;
2521 if (!ipv4_is_multicast(addr
))
2524 err
= -EADDRNOTAVAIL
;
2526 for_each_pmc_rtnl(inet
, pmc
) {
2527 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2528 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2531 if (!pmc
) /* must have a prior join */
2533 gsf
->gf_fmode
= pmc
->sfmode
;
2534 psl
= rtnl_dereference(pmc
->sflist
);
2535 count
= psl
? psl
->sl_count
: 0;
2536 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2537 gsf
->gf_numsrc
= count
;
2538 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2539 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2542 for (i
= 0; i
< copycount
; i
++) {
2543 struct sockaddr_storage ss
;
2545 psin
= (struct sockaddr_in
*)&ss
;
2546 memset(&ss
, 0, sizeof(ss
));
2547 psin
->sin_family
= AF_INET
;
2548 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2549 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2558 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2560 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2562 struct inet_sock
*inet
= inet_sk(sk
);
2563 struct ip_mc_socklist
*pmc
;
2564 struct ip_sf_socklist
*psl
;
2569 if (!ipv4_is_multicast(loc_addr
))
2573 for_each_pmc_rcu(inet
, pmc
) {
2574 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2575 pmc
->multi
.imr_ifindex
== dif
)
2581 psl
= rcu_dereference(pmc
->sflist
);
2582 ret
= (pmc
->sfmode
== MCAST_EXCLUDE
);
2586 for (i
= 0; i
< psl
->sl_count
; i
++) {
2587 if (psl
->sl_addr
[i
] == rmt_addr
)
2591 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2593 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2603 * A socket is closing.
2606 void ip_mc_drop_socket(struct sock
*sk
)
2608 struct inet_sock
*inet
= inet_sk(sk
);
2609 struct ip_mc_socklist
*iml
;
2610 struct net
*net
= sock_net(sk
);
2616 while ((iml
= rtnl_dereference(inet
->mc_list
)) != NULL
) {
2617 struct in_device
*in_dev
;
2619 inet
->mc_list
= iml
->next_rcu
;
2620 in_dev
= inetdev_by_index(net
, iml
->multi
.imr_ifindex
);
2621 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2623 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2624 /* decrease mem now to avoid the memleak warning */
2625 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2626 kfree_rcu(iml
, rcu
);
2631 /* called with rcu_read_lock() */
2632 int ip_check_mc_rcu(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u8 proto
)
2634 struct ip_mc_list
*im
;
2635 struct ip_mc_list __rcu
**mc_hash
;
2636 struct ip_sf_list
*psf
;
2639 mc_hash
= rcu_dereference(in_dev
->mc_hash
);
2641 u32 hash
= hash_32((__force u32
)mc_addr
, MC_HASH_SZ_LOG
);
2643 for (im
= rcu_dereference(mc_hash
[hash
]);
2645 im
= rcu_dereference(im
->next_hash
)) {
2646 if (im
->multiaddr
== mc_addr
)
2650 for_each_pmc_rcu(in_dev
, im
) {
2651 if (im
->multiaddr
== mc_addr
)
2655 if (im
&& proto
== IPPROTO_IGMP
) {
2659 for (psf
= im
->sources
; psf
; psf
= psf
->sf_next
) {
2660 if (psf
->sf_inaddr
== src_addr
)
2664 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2665 psf
->sf_count
[MCAST_EXCLUDE
] !=
2666 im
->sfcount
[MCAST_EXCLUDE
];
2668 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2670 rv
= 1; /* unspecified source; tentatively allow */
2675 #if defined(CONFIG_PROC_FS)
2676 struct igmp_mc_iter_state
{
2677 struct seq_net_private p
;
2678 struct net_device
*dev
;
2679 struct in_device
*in_dev
;
2682 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2684 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2686 struct net
*net
= seq_file_net(seq
);
2687 struct ip_mc_list
*im
= NULL
;
2688 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2690 state
->in_dev
= NULL
;
2691 for_each_netdev_rcu(net
, state
->dev
) {
2692 struct in_device
*in_dev
;
2694 in_dev
= __in_dev_get_rcu(state
->dev
);
2697 im
= rcu_dereference(in_dev
->mc_list
);
2699 state
->in_dev
= in_dev
;
2706 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2708 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2710 im
= rcu_dereference(im
->next_rcu
);
2712 state
->dev
= next_net_device_rcu(state
->dev
);
2714 state
->in_dev
= NULL
;
2717 state
->in_dev
= __in_dev_get_rcu(state
->dev
);
2720 im
= rcu_dereference(state
->in_dev
->mc_list
);
2725 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2727 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2729 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2731 return pos
? NULL
: im
;
2734 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2738 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2741 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2743 struct ip_mc_list
*im
;
2744 if (v
== SEQ_START_TOKEN
)
2745 im
= igmp_mc_get_first(seq
);
2747 im
= igmp_mc_get_next(seq
, v
);
2752 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2755 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2757 state
->in_dev
= NULL
;
2762 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2764 if (v
== SEQ_START_TOKEN
)
2766 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2768 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2769 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2773 #ifdef CONFIG_IP_MULTICAST
2774 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2775 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2781 if (rcu_access_pointer(state
->in_dev
->mc_list
) == im
) {
2782 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2783 state
->dev
->ifindex
, state
->dev
->name
, state
->in_dev
->mc_count
, querier
);
2786 delta
= im
->timer
.expires
- jiffies
;
2788 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2789 im
->multiaddr
, im
->users
,
2791 im
->tm_running
? jiffies_delta_to_clock_t(delta
) : 0,
2797 static const struct seq_operations igmp_mc_seq_ops
= {
2798 .start
= igmp_mc_seq_start
,
2799 .next
= igmp_mc_seq_next
,
2800 .stop
= igmp_mc_seq_stop
,
2801 .show
= igmp_mc_seq_show
,
2804 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2806 return seq_open_net(inode
, file
, &igmp_mc_seq_ops
,
2807 sizeof(struct igmp_mc_iter_state
));
2810 static const struct file_operations igmp_mc_seq_fops
= {
2811 .owner
= THIS_MODULE
,
2812 .open
= igmp_mc_seq_open
,
2814 .llseek
= seq_lseek
,
2815 .release
= seq_release_net
,
2818 struct igmp_mcf_iter_state
{
2819 struct seq_net_private p
;
2820 struct net_device
*dev
;
2821 struct in_device
*idev
;
2822 struct ip_mc_list
*im
;
2825 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2827 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2829 struct net
*net
= seq_file_net(seq
);
2830 struct ip_sf_list
*psf
= NULL
;
2831 struct ip_mc_list
*im
= NULL
;
2832 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2836 for_each_netdev_rcu(net
, state
->dev
) {
2837 struct in_device
*idev
;
2838 idev
= __in_dev_get_rcu(state
->dev
);
2839 if (unlikely(!idev
))
2841 im
= rcu_dereference(idev
->mc_list
);
2843 spin_lock_bh(&im
->lock
);
2850 spin_unlock_bh(&im
->lock
);
2856 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2858 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2862 spin_unlock_bh(&state
->im
->lock
);
2863 state
->im
= state
->im
->next
;
2864 while (!state
->im
) {
2865 state
->dev
= next_net_device_rcu(state
->dev
);
2870 state
->idev
= __in_dev_get_rcu(state
->dev
);
2873 state
->im
= rcu_dereference(state
->idev
->mc_list
);
2877 spin_lock_bh(&state
->im
->lock
);
2878 psf
= state
->im
->sources
;
2884 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2886 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2888 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2890 return pos
? NULL
: psf
;
2893 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2897 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2900 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2902 struct ip_sf_list
*psf
;
2903 if (v
== SEQ_START_TOKEN
)
2904 psf
= igmp_mcf_get_first(seq
);
2906 psf
= igmp_mcf_get_next(seq
, v
);
2911 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2914 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2915 if (likely(state
->im
)) {
2916 spin_unlock_bh(&state
->im
->lock
);
2924 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2926 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2927 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2929 if (v
== SEQ_START_TOKEN
) {
2930 seq_puts(seq
, "Idx Device MCA SRC INC EXC\n");
2934 "0x%08x %6lu %6lu\n",
2935 state
->dev
->ifindex
, state
->dev
->name
,
2936 ntohl(state
->im
->multiaddr
),
2937 ntohl(psf
->sf_inaddr
),
2938 psf
->sf_count
[MCAST_INCLUDE
],
2939 psf
->sf_count
[MCAST_EXCLUDE
]);
2944 static const struct seq_operations igmp_mcf_seq_ops
= {
2945 .start
= igmp_mcf_seq_start
,
2946 .next
= igmp_mcf_seq_next
,
2947 .stop
= igmp_mcf_seq_stop
,
2948 .show
= igmp_mcf_seq_show
,
2951 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2953 return seq_open_net(inode
, file
, &igmp_mcf_seq_ops
,
2954 sizeof(struct igmp_mcf_iter_state
));
2957 static const struct file_operations igmp_mcf_seq_fops
= {
2958 .owner
= THIS_MODULE
,
2959 .open
= igmp_mcf_seq_open
,
2961 .llseek
= seq_lseek
,
2962 .release
= seq_release_net
,
2965 static int __net_init
igmp_net_init(struct net
*net
)
2967 struct proc_dir_entry
*pde
;
2970 pde
= proc_create("igmp", S_IRUGO
, net
->proc_net
, &igmp_mc_seq_fops
);
2973 pde
= proc_create("mcfilter", S_IRUGO
, net
->proc_net
,
2974 &igmp_mcf_seq_fops
);
2977 err
= inet_ctl_sock_create(&net
->ipv4
.mc_autojoin_sk
, AF_INET
,
2978 SOCK_DGRAM
, 0, net
);
2980 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2988 remove_proc_entry("mcfilter", net
->proc_net
);
2990 remove_proc_entry("igmp", net
->proc_net
);
2995 static void __net_exit
igmp_net_exit(struct net
*net
)
2997 remove_proc_entry("mcfilter", net
->proc_net
);
2998 remove_proc_entry("igmp", net
->proc_net
);
2999 inet_ctl_sock_destroy(net
->ipv4
.mc_autojoin_sk
);
3002 static struct pernet_operations igmp_net_ops
= {
3003 .init
= igmp_net_init
,
3004 .exit
= igmp_net_exit
,
3008 static int igmp_netdev_event(struct notifier_block
*this,
3009 unsigned long event
, void *ptr
)
3011 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
3012 struct in_device
*in_dev
;
3015 case NETDEV_RESEND_IGMP
:
3016 in_dev
= __in_dev_get_rtnl(dev
);
3018 ip_mc_rejoin_groups(in_dev
);
3026 static struct notifier_block igmp_notifier
= {
3027 .notifier_call
= igmp_netdev_event
,
3030 int __init
igmp_mc_init(void)
3032 #if defined(CONFIG_PROC_FS)
3035 err
= register_pernet_subsys(&igmp_net_ops
);
3038 err
= register_netdevice_notifier(&igmp_notifier
);
3040 goto reg_notif_fail
;
3044 unregister_pernet_subsys(&igmp_net_ops
);
3047 return register_netdevice_notifier(&igmp_notifier
);