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 <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
, __be32 multiaddr
);
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 (atomic_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 atomic_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 atomic_inc(&im
->refcnt
);
219 static void igmp_gq_start_timer(struct in_device
*in_dev
)
221 int tv
= prandom_u32() % in_dev
->mr_maxdelay
;
223 in_dev
->mr_gq_running
= 1;
224 if (!mod_timer(&in_dev
->mr_gq_timer
, jiffies
+tv
+2))
228 static void igmp_ifc_start_timer(struct in_device
*in_dev
, int delay
)
230 int tv
= prandom_u32() % delay
;
232 if (!mod_timer(&in_dev
->mr_ifc_timer
, jiffies
+tv
+2))
236 static void igmp_mod_timer(struct ip_mc_list
*im
, int max_delay
)
238 spin_lock_bh(&im
->lock
);
239 im
->unsolicit_count
= 0;
240 if (del_timer(&im
->timer
)) {
241 if ((long)(im
->timer
.expires
-jiffies
) < max_delay
) {
242 add_timer(&im
->timer
);
244 spin_unlock_bh(&im
->lock
);
247 atomic_dec(&im
->refcnt
);
249 igmp_start_timer(im
, max_delay
);
250 spin_unlock_bh(&im
->lock
);
255 * Send an IGMP report.
258 #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
261 static int is_in(struct ip_mc_list
*pmc
, struct ip_sf_list
*psf
, int type
,
262 int gdeleted
, int sdeleted
)
265 case IGMPV3_MODE_IS_INCLUDE
:
266 case IGMPV3_MODE_IS_EXCLUDE
:
267 if (gdeleted
|| sdeleted
)
269 if (!(pmc
->gsquery
&& !psf
->sf_gsresp
)) {
270 if (pmc
->sfmode
== MCAST_INCLUDE
)
272 /* don't include if this source is excluded
275 if (psf
->sf_count
[MCAST_INCLUDE
])
276 return type
== IGMPV3_MODE_IS_INCLUDE
;
277 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
278 psf
->sf_count
[MCAST_EXCLUDE
];
281 case IGMPV3_CHANGE_TO_INCLUDE
:
282 if (gdeleted
|| sdeleted
)
284 return psf
->sf_count
[MCAST_INCLUDE
] != 0;
285 case IGMPV3_CHANGE_TO_EXCLUDE
:
286 if (gdeleted
|| sdeleted
)
288 if (pmc
->sfcount
[MCAST_EXCLUDE
] == 0 ||
289 psf
->sf_count
[MCAST_INCLUDE
])
291 return pmc
->sfcount
[MCAST_EXCLUDE
] ==
292 psf
->sf_count
[MCAST_EXCLUDE
];
293 case IGMPV3_ALLOW_NEW_SOURCES
:
294 if (gdeleted
|| !psf
->sf_crcount
)
296 return (pmc
->sfmode
== MCAST_INCLUDE
) ^ sdeleted
;
297 case IGMPV3_BLOCK_OLD_SOURCES
:
298 if (pmc
->sfmode
== MCAST_INCLUDE
)
299 return gdeleted
|| (psf
->sf_crcount
&& sdeleted
);
300 return psf
->sf_crcount
&& !gdeleted
&& !sdeleted
;
306 igmp_scount(struct ip_mc_list
*pmc
, int type
, int gdeleted
, int sdeleted
)
308 struct ip_sf_list
*psf
;
311 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
312 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
))
319 static struct sk_buff
*igmpv3_newpack(struct net_device
*dev
, unsigned int mtu
)
324 struct igmpv3_report
*pig
;
325 struct net
*net
= dev_net(dev
);
327 int hlen
= LL_RESERVED_SPACE(dev
);
328 int tlen
= dev
->needed_tailroom
;
329 unsigned int size
= mtu
;
332 skb
= alloc_skb(size
+ hlen
+ tlen
,
333 GFP_ATOMIC
| __GFP_NOWARN
);
340 skb
->priority
= TC_PRIO_CONTROL
;
342 rt
= ip_route_output_ports(net
, &fl4
, NULL
, IGMPV3_ALL_MCR
, 0,
344 IPPROTO_IGMP
, 0, dev
->ifindex
);
350 skb_dst_set(skb
, &rt
->dst
);
353 skb_reserve(skb
, hlen
);
354 skb_tailroom_reserve(skb
, mtu
, tlen
);
356 skb_reset_network_header(skb
);
358 skb_put(skb
, sizeof(struct iphdr
) + 4);
361 pip
->ihl
= (sizeof(struct iphdr
)+4)>>2;
363 pip
->frag_off
= htons(IP_DF
);
365 pip
->daddr
= fl4
.daddr
;
366 pip
->saddr
= fl4
.saddr
;
367 pip
->protocol
= IPPROTO_IGMP
;
368 pip
->tot_len
= 0; /* filled in later */
369 ip_select_ident(net
, skb
, NULL
);
370 ((u8
*)&pip
[1])[0] = IPOPT_RA
;
371 ((u8
*)&pip
[1])[1] = 4;
372 ((u8
*)&pip
[1])[2] = 0;
373 ((u8
*)&pip
[1])[3] = 0;
375 skb
->transport_header
= skb
->network_header
+ sizeof(struct iphdr
) + 4;
376 skb_put(skb
, sizeof(*pig
));
377 pig
= igmpv3_report_hdr(skb
);
378 pig
->type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
386 static int igmpv3_sendpack(struct sk_buff
*skb
)
388 struct igmphdr
*pig
= igmp_hdr(skb
);
389 const int igmplen
= skb_tail_pointer(skb
) - skb_transport_header(skb
);
391 pig
->csum
= ip_compute_csum(igmp_hdr(skb
), igmplen
);
393 return ip_local_out(dev_net(skb_dst(skb
)->dev
), skb
->sk
, skb
);
396 static int grec_size(struct ip_mc_list
*pmc
, int type
, int gdel
, int sdel
)
398 return sizeof(struct igmpv3_grec
) + 4*igmp_scount(pmc
, type
, gdel
, sdel
);
401 static struct sk_buff
*add_grhead(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
402 int type
, struct igmpv3_grec
**ppgr
)
404 struct net_device
*dev
= pmc
->interface
->dev
;
405 struct igmpv3_report
*pih
;
406 struct igmpv3_grec
*pgr
;
409 skb
= igmpv3_newpack(dev
, dev
->mtu
);
412 pgr
= (struct igmpv3_grec
*)skb_put(skb
, sizeof(struct igmpv3_grec
));
413 pgr
->grec_type
= type
;
414 pgr
->grec_auxwords
= 0;
416 pgr
->grec_mca
= pmc
->multiaddr
;
417 pih
= igmpv3_report_hdr(skb
);
418 pih
->ngrec
= htons(ntohs(pih
->ngrec
)+1);
423 #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0)
425 static struct sk_buff
*add_grec(struct sk_buff
*skb
, struct ip_mc_list
*pmc
,
426 int type
, int gdeleted
, int sdeleted
)
428 struct net_device
*dev
= pmc
->interface
->dev
;
429 struct net
*net
= dev_net(dev
);
430 struct igmpv3_report
*pih
;
431 struct igmpv3_grec
*pgr
= NULL
;
432 struct ip_sf_list
*psf
, *psf_next
, *psf_prev
, **psf_list
;
433 int scount
, stotal
, first
, isquery
, truncate
;
435 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
437 if (ipv4_is_local_multicast(pmc
->multiaddr
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
440 isquery
= type
== IGMPV3_MODE_IS_INCLUDE
||
441 type
== IGMPV3_MODE_IS_EXCLUDE
;
442 truncate
= type
== IGMPV3_MODE_IS_EXCLUDE
||
443 type
== IGMPV3_CHANGE_TO_EXCLUDE
;
447 psf_list
= sdeleted
? &pmc
->tomb
: &pmc
->sources
;
452 pih
= skb
? igmpv3_report_hdr(skb
) : NULL
;
454 /* EX and TO_EX get a fresh packet, if needed */
456 if (pih
&& pih
->ngrec
&&
457 AVAILABLE(skb
) < grec_size(pmc
, type
, gdeleted
, sdeleted
)) {
459 igmpv3_sendpack(skb
);
460 skb
= igmpv3_newpack(dev
, dev
->mtu
);
465 for (psf
= *psf_list
; psf
; psf
= psf_next
) {
468 psf_next
= psf
->sf_next
;
470 if (!is_in(pmc
, psf
, type
, gdeleted
, sdeleted
)) {
475 /* Based on RFC3376 5.1. Should not send source-list change
476 * records when there is a filter mode change.
478 if (((gdeleted
&& pmc
->sfmode
== MCAST_EXCLUDE
) ||
479 (!gdeleted
&& pmc
->crcount
)) &&
480 (type
== IGMPV3_ALLOW_NEW_SOURCES
||
481 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
)
482 goto decrease_sf_crcount
;
484 /* clear marks on query responses */
488 if (AVAILABLE(skb
) < sizeof(__be32
) +
489 first
*sizeof(struct igmpv3_grec
)) {
490 if (truncate
&& !first
)
491 break; /* truncate these */
493 pgr
->grec_nsrcs
= htons(scount
);
495 igmpv3_sendpack(skb
);
496 skb
= igmpv3_newpack(dev
, dev
->mtu
);
501 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
506 psrc
= (__be32
*)skb_put(skb
, sizeof(__be32
));
507 *psrc
= psf
->sf_inaddr
;
509 if ((type
== IGMPV3_ALLOW_NEW_SOURCES
||
510 type
== IGMPV3_BLOCK_OLD_SOURCES
) && psf
->sf_crcount
) {
513 if ((sdeleted
|| gdeleted
) && psf
->sf_crcount
== 0) {
515 psf_prev
->sf_next
= psf
->sf_next
;
517 *psf_list
= psf
->sf_next
;
527 if (type
== IGMPV3_ALLOW_NEW_SOURCES
||
528 type
== IGMPV3_BLOCK_OLD_SOURCES
)
530 if (pmc
->crcount
|| isquery
) {
531 /* make sure we have room for group header */
532 if (skb
&& AVAILABLE(skb
) < sizeof(struct igmpv3_grec
)) {
533 igmpv3_sendpack(skb
);
534 skb
= NULL
; /* add_grhead will get a new one */
536 skb
= add_grhead(skb
, pmc
, type
, &pgr
);
540 pgr
->grec_nsrcs
= htons(scount
);
543 pmc
->gsquery
= 0; /* clear query state on report */
547 static int igmpv3_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
)
549 struct sk_buff
*skb
= NULL
;
550 struct net
*net
= dev_net(in_dev
->dev
);
555 for_each_pmc_rcu(in_dev
, pmc
) {
556 if (pmc
->multiaddr
== IGMP_ALL_HOSTS
)
558 if (ipv4_is_local_multicast(pmc
->multiaddr
) &&
559 !net
->ipv4
.sysctl_igmp_llm_reports
)
561 spin_lock_bh(&pmc
->lock
);
562 if (pmc
->sfcount
[MCAST_EXCLUDE
])
563 type
= IGMPV3_MODE_IS_EXCLUDE
;
565 type
= IGMPV3_MODE_IS_INCLUDE
;
566 skb
= add_grec(skb
, pmc
, type
, 0, 0);
567 spin_unlock_bh(&pmc
->lock
);
571 spin_lock_bh(&pmc
->lock
);
572 if (pmc
->sfcount
[MCAST_EXCLUDE
])
573 type
= IGMPV3_MODE_IS_EXCLUDE
;
575 type
= IGMPV3_MODE_IS_INCLUDE
;
576 skb
= add_grec(skb
, pmc
, type
, 0, 0);
577 spin_unlock_bh(&pmc
->lock
);
581 return igmpv3_sendpack(skb
);
585 * remove zero-count source records from a source filter list
587 static void igmpv3_clear_zeros(struct ip_sf_list
**ppsf
)
589 struct ip_sf_list
*psf_prev
, *psf_next
, *psf
;
592 for (psf
= *ppsf
; psf
; psf
= psf_next
) {
593 psf_next
= psf
->sf_next
;
594 if (psf
->sf_crcount
== 0) {
596 psf_prev
->sf_next
= psf
->sf_next
;
598 *ppsf
= psf
->sf_next
;
605 static void igmpv3_send_cr(struct in_device
*in_dev
)
607 struct ip_mc_list
*pmc
, *pmc_prev
, *pmc_next
;
608 struct sk_buff
*skb
= NULL
;
612 spin_lock_bh(&in_dev
->mc_tomb_lock
);
616 for (pmc
= in_dev
->mc_tomb
; pmc
; pmc
= pmc_next
) {
617 pmc_next
= pmc
->next
;
618 if (pmc
->sfmode
== MCAST_INCLUDE
) {
619 type
= IGMPV3_BLOCK_OLD_SOURCES
;
620 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
621 skb
= add_grec(skb
, pmc
, type
, 1, 0);
622 skb
= add_grec(skb
, pmc
, dtype
, 1, 1);
625 if (pmc
->sfmode
== MCAST_EXCLUDE
) {
626 type
= IGMPV3_CHANGE_TO_INCLUDE
;
627 skb
= add_grec(skb
, pmc
, type
, 1, 0);
630 if (pmc
->crcount
== 0) {
631 igmpv3_clear_zeros(&pmc
->tomb
);
632 igmpv3_clear_zeros(&pmc
->sources
);
635 if (pmc
->crcount
== 0 && !pmc
->tomb
&& !pmc
->sources
) {
637 pmc_prev
->next
= pmc_next
;
639 in_dev
->mc_tomb
= pmc_next
;
640 in_dev_put(pmc
->interface
);
645 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
648 for_each_pmc_rcu(in_dev
, pmc
) {
649 spin_lock_bh(&pmc
->lock
);
650 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
651 type
= IGMPV3_BLOCK_OLD_SOURCES
;
652 dtype
= IGMPV3_ALLOW_NEW_SOURCES
;
654 type
= IGMPV3_ALLOW_NEW_SOURCES
;
655 dtype
= IGMPV3_BLOCK_OLD_SOURCES
;
657 skb
= add_grec(skb
, pmc
, type
, 0, 0);
658 skb
= add_grec(skb
, pmc
, dtype
, 0, 1); /* deleted sources */
660 /* filter mode changes */
662 if (pmc
->sfmode
== MCAST_EXCLUDE
)
663 type
= IGMPV3_CHANGE_TO_EXCLUDE
;
665 type
= IGMPV3_CHANGE_TO_INCLUDE
;
666 skb
= add_grec(skb
, pmc
, type
, 0, 0);
669 spin_unlock_bh(&pmc
->lock
);
675 (void) igmpv3_sendpack(skb
);
678 static int igmp_send_report(struct in_device
*in_dev
, struct ip_mc_list
*pmc
,
685 struct net_device
*dev
= in_dev
->dev
;
686 struct net
*net
= dev_net(dev
);
687 __be32 group
= pmc
? pmc
->multiaddr
: 0;
692 if (type
== IGMPV3_HOST_MEMBERSHIP_REPORT
)
693 return igmpv3_send_report(in_dev
, pmc
);
695 if (ipv4_is_local_multicast(group
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
698 if (type
== IGMP_HOST_LEAVE_MESSAGE
)
699 dst
= IGMP_ALL_ROUTER
;
703 rt
= ip_route_output_ports(net
, &fl4
, NULL
, dst
, 0,
705 IPPROTO_IGMP
, 0, dev
->ifindex
);
709 hlen
= LL_RESERVED_SPACE(dev
);
710 tlen
= dev
->needed_tailroom
;
711 skb
= alloc_skb(IGMP_SIZE
+ hlen
+ tlen
, GFP_ATOMIC
);
716 skb
->priority
= TC_PRIO_CONTROL
;
718 skb_dst_set(skb
, &rt
->dst
);
720 skb_reserve(skb
, hlen
);
722 skb_reset_network_header(skb
);
724 skb_put(skb
, sizeof(struct iphdr
) + 4);
727 iph
->ihl
= (sizeof(struct iphdr
)+4)>>2;
729 iph
->frag_off
= htons(IP_DF
);
732 iph
->saddr
= fl4
.saddr
;
733 iph
->protocol
= IPPROTO_IGMP
;
734 ip_select_ident(net
, skb
, NULL
);
735 ((u8
*)&iph
[1])[0] = IPOPT_RA
;
736 ((u8
*)&iph
[1])[1] = 4;
737 ((u8
*)&iph
[1])[2] = 0;
738 ((u8
*)&iph
[1])[3] = 0;
740 ih
= (struct igmphdr
*)skb_put(skb
, sizeof(struct igmphdr
));
745 ih
->csum
= ip_compute_csum((void *)ih
, sizeof(struct igmphdr
));
747 return ip_local_out(net
, skb
->sk
, skb
);
750 static void igmp_gq_timer_expire(unsigned long data
)
752 struct in_device
*in_dev
= (struct in_device
*)data
;
754 in_dev
->mr_gq_running
= 0;
755 igmpv3_send_report(in_dev
, NULL
);
759 static void igmp_ifc_timer_expire(unsigned long data
)
761 struct in_device
*in_dev
= (struct in_device
*)data
;
763 igmpv3_send_cr(in_dev
);
764 if (in_dev
->mr_ifc_count
) {
765 in_dev
->mr_ifc_count
--;
766 igmp_ifc_start_timer(in_dev
,
767 unsolicited_report_interval(in_dev
));
772 static void igmp_ifc_event(struct in_device
*in_dev
)
774 struct net
*net
= dev_net(in_dev
->dev
);
775 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
))
777 in_dev
->mr_ifc_count
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
778 igmp_ifc_start_timer(in_dev
, 1);
782 static void igmp_timer_expire(unsigned long data
)
784 struct ip_mc_list
*im
= (struct ip_mc_list
*)data
;
785 struct in_device
*in_dev
= im
->interface
;
787 spin_lock(&im
->lock
);
790 if (im
->unsolicit_count
) {
791 im
->unsolicit_count
--;
792 igmp_start_timer(im
, unsolicited_report_interval(in_dev
));
795 spin_unlock(&im
->lock
);
797 if (IGMP_V1_SEEN(in_dev
))
798 igmp_send_report(in_dev
, im
, IGMP_HOST_MEMBERSHIP_REPORT
);
799 else if (IGMP_V2_SEEN(in_dev
))
800 igmp_send_report(in_dev
, im
, IGMPV2_HOST_MEMBERSHIP_REPORT
);
802 igmp_send_report(in_dev
, im
, IGMPV3_HOST_MEMBERSHIP_REPORT
);
807 /* mark EXCLUDE-mode sources */
808 static int igmp_xmarksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
810 struct ip_sf_list
*psf
;
814 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
817 for (i
= 0; i
< nsrcs
; i
++) {
818 /* skip inactive filters */
819 if (psf
->sf_count
[MCAST_INCLUDE
] ||
820 pmc
->sfcount
[MCAST_EXCLUDE
] !=
821 psf
->sf_count
[MCAST_EXCLUDE
])
823 if (srcs
[i
] == psf
->sf_inaddr
) {
830 if (scount
== nsrcs
) /* all sources excluded */
835 static int igmp_marksources(struct ip_mc_list
*pmc
, int nsrcs
, __be32
*srcs
)
837 struct ip_sf_list
*psf
;
840 if (pmc
->sfmode
== MCAST_EXCLUDE
)
841 return igmp_xmarksources(pmc
, nsrcs
, srcs
);
843 /* mark INCLUDE-mode sources */
845 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
848 for (i
= 0; i
< nsrcs
; i
++)
849 if (srcs
[i
] == psf
->sf_inaddr
) {
863 /* return true if packet was dropped */
864 static bool igmp_heard_report(struct in_device
*in_dev
, __be32 group
)
866 struct ip_mc_list
*im
;
867 struct net
*net
= dev_net(in_dev
->dev
);
869 /* Timers are only set for non-local groups */
871 if (group
== IGMP_ALL_HOSTS
)
873 if (ipv4_is_local_multicast(group
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
877 for_each_pmc_rcu(in_dev
, im
) {
878 if (im
->multiaddr
== group
) {
887 /* return true if packet was dropped */
888 static bool igmp_heard_query(struct in_device
*in_dev
, struct sk_buff
*skb
,
891 struct igmphdr
*ih
= igmp_hdr(skb
);
892 struct igmpv3_query
*ih3
= igmpv3_query_hdr(skb
);
893 struct ip_mc_list
*im
;
894 __be32 group
= ih
->group
;
897 struct net
*net
= dev_net(in_dev
->dev
);
902 /* Alas, old v1 router presents here. */
904 max_delay
= IGMP_QUERY_RESPONSE_INTERVAL
;
905 in_dev
->mr_v1_seen
= jiffies
+
906 IGMP_V1_ROUTER_PRESENT_TIMEOUT
;
909 /* v2 router present */
910 max_delay
= ih
->code
*(HZ
/IGMP_TIMER_SCALE
);
911 in_dev
->mr_v2_seen
= jiffies
+
912 IGMP_V2_ROUTER_PRESENT_TIMEOUT
;
914 /* cancel the interface change timer */
915 in_dev
->mr_ifc_count
= 0;
916 if (del_timer(&in_dev
->mr_ifc_timer
))
917 __in_dev_put(in_dev
);
918 /* clear deleted report items */
919 igmpv3_clear_delrec(in_dev
);
920 } else if (len
< 12) {
921 return true; /* ignore bogus packet; freed by caller */
922 } else if (IGMP_V1_SEEN(in_dev
)) {
923 /* This is a v3 query with v1 queriers present */
924 max_delay
= IGMP_QUERY_RESPONSE_INTERVAL
;
926 } else if (IGMP_V2_SEEN(in_dev
)) {
927 /* this is a v3 query with v2 queriers present;
928 * Interpretation of the max_delay code is problematic here.
929 * A real v2 host would use ih_code directly, while v3 has a
930 * different encoding. We use the v3 encoding as more likely
931 * to be intended in a v3 query.
933 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
935 max_delay
= 1; /* can't mod w/ 0 */
937 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)))
940 ih3
= igmpv3_query_hdr(skb
);
942 if (!pskb_may_pull(skb
, sizeof(struct igmpv3_query
)
943 + ntohs(ih3
->nsrcs
)*sizeof(__be32
)))
945 ih3
= igmpv3_query_hdr(skb
);
948 max_delay
= IGMPV3_MRC(ih3
->code
)*(HZ
/IGMP_TIMER_SCALE
);
950 max_delay
= 1; /* can't mod w/ 0 */
951 in_dev
->mr_maxdelay
= max_delay
;
953 in_dev
->mr_qrv
= ih3
->qrv
;
954 if (!group
) { /* general query */
956 return true; /* no sources allowed */
957 igmp_gq_start_timer(in_dev
);
960 /* mark sources to include, if group & source-specific */
961 mark
= ih3
->nsrcs
!= 0;
965 * - Start the timers in all of our membership records
966 * that the query applies to for the interface on
967 * which the query arrived excl. those that belong
968 * to a "local" group (224.0.0.X)
969 * - For timers already running check if they need to
971 * - Use the igmp->igmp_code field as the maximum
975 for_each_pmc_rcu(in_dev
, im
) {
978 if (group
&& group
!= im
->multiaddr
)
980 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
982 if (ipv4_is_local_multicast(im
->multiaddr
) &&
983 !net
->ipv4
.sysctl_igmp_llm_reports
)
985 spin_lock_bh(&im
->lock
);
987 im
->gsquery
= im
->gsquery
&& mark
;
990 changed
= !im
->gsquery
||
991 igmp_marksources(im
, ntohs(ih3
->nsrcs
), ih3
->srcs
);
992 spin_unlock_bh(&im
->lock
);
994 igmp_mod_timer(im
, max_delay
);
1000 /* called in rcu_read_lock() section */
1001 int igmp_rcv(struct sk_buff
*skb
)
1003 /* This basically follows the spec line by line -- see RFC1112 */
1005 struct in_device
*in_dev
= __in_dev_get_rcu(skb
->dev
);
1007 bool dropped
= true;
1012 if (!pskb_may_pull(skb
, sizeof(struct igmphdr
)))
1015 if (skb_checksum_simple_validate(skb
))
1020 case IGMP_HOST_MEMBERSHIP_QUERY
:
1021 dropped
= igmp_heard_query(in_dev
, skb
, len
);
1023 case IGMP_HOST_MEMBERSHIP_REPORT
:
1024 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1025 /* Is it our report looped back? */
1026 if (rt_is_output_route(skb_rtable(skb
)))
1028 /* don't rely on MC router hearing unicast reports */
1029 if (skb
->pkt_type
== PACKET_MULTICAST
||
1030 skb
->pkt_type
== PACKET_BROADCAST
)
1031 dropped
= igmp_heard_report(in_dev
, ih
->group
);
1034 #ifdef CONFIG_IP_PIMSM_V1
1035 return pim_rcv_v1(skb
);
1037 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1040 case IGMP_HOST_LEAVE_MESSAGE
:
1042 case IGMP_MTRACE_RESP
:
1060 * Add a filter to a device
1063 static void ip_mc_filter_add(struct in_device
*in_dev
, __be32 addr
)
1065 char buf
[MAX_ADDR_LEN
];
1066 struct net_device
*dev
= in_dev
->dev
;
1068 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1069 We will get multicast token leakage, when IFF_MULTICAST
1070 is changed. This check should be done in ndo_set_rx_mode
1071 routine. Something sort of:
1072 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1075 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1076 dev_mc_add(dev
, buf
);
1080 * Remove a filter from a device
1083 static void ip_mc_filter_del(struct in_device
*in_dev
, __be32 addr
)
1085 char buf
[MAX_ADDR_LEN
];
1086 struct net_device
*dev
= in_dev
->dev
;
1088 if (arp_mc_map(addr
, buf
, dev
, 0) == 0)
1089 dev_mc_del(dev
, buf
);
1092 #ifdef CONFIG_IP_MULTICAST
1094 * deleted ip_mc_list manipulation
1096 static void igmpv3_add_delrec(struct in_device
*in_dev
, struct ip_mc_list
*im
)
1098 struct ip_mc_list
*pmc
;
1099 struct net
*net
= dev_net(in_dev
->dev
);
1101 /* this is an "ip_mc_list" for convenience; only the fields below
1102 * are actually used. In particular, the refcnt and users are not
1103 * used for management of the delete list. Using the same structure
1104 * for deleted items allows change reports to use common code with
1105 * non-deleted or query-response MCA's.
1107 pmc
= kzalloc(sizeof(*pmc
), GFP_KERNEL
);
1110 spin_lock_bh(&im
->lock
);
1111 pmc
->interface
= im
->interface
;
1112 in_dev_hold(in_dev
);
1113 pmc
->multiaddr
= im
->multiaddr
;
1114 pmc
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1115 pmc
->sfmode
= im
->sfmode
;
1116 if (pmc
->sfmode
== MCAST_INCLUDE
) {
1117 struct ip_sf_list
*psf
;
1119 pmc
->tomb
= im
->tomb
;
1120 pmc
->sources
= im
->sources
;
1121 im
->tomb
= im
->sources
= NULL
;
1122 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1123 psf
->sf_crcount
= pmc
->crcount
;
1125 spin_unlock_bh(&im
->lock
);
1127 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1128 pmc
->next
= in_dev
->mc_tomb
;
1129 in_dev
->mc_tomb
= pmc
;
1130 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1133 static void igmpv3_del_delrec(struct in_device
*in_dev
, __be32 multiaddr
)
1135 struct ip_mc_list
*pmc
, *pmc_prev
;
1136 struct ip_sf_list
*psf
, *psf_next
;
1138 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1140 for (pmc
= in_dev
->mc_tomb
; pmc
; pmc
= pmc
->next
) {
1141 if (pmc
->multiaddr
== multiaddr
)
1147 pmc_prev
->next
= pmc
->next
;
1149 in_dev
->mc_tomb
= pmc
->next
;
1151 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1153 for (psf
= pmc
->tomb
; psf
; psf
= psf_next
) {
1154 psf_next
= psf
->sf_next
;
1157 in_dev_put(pmc
->interface
);
1162 static void igmpv3_clear_delrec(struct in_device
*in_dev
)
1164 struct ip_mc_list
*pmc
, *nextpmc
;
1166 spin_lock_bh(&in_dev
->mc_tomb_lock
);
1167 pmc
= in_dev
->mc_tomb
;
1168 in_dev
->mc_tomb
= NULL
;
1169 spin_unlock_bh(&in_dev
->mc_tomb_lock
);
1171 for (; pmc
; pmc
= nextpmc
) {
1172 nextpmc
= pmc
->next
;
1173 ip_mc_clear_src(pmc
);
1174 in_dev_put(pmc
->interface
);
1177 /* clear dead sources, too */
1179 for_each_pmc_rcu(in_dev
, pmc
) {
1180 struct ip_sf_list
*psf
, *psf_next
;
1182 spin_lock_bh(&pmc
->lock
);
1185 spin_unlock_bh(&pmc
->lock
);
1186 for (; psf
; psf
= psf_next
) {
1187 psf_next
= psf
->sf_next
;
1195 static void igmp_group_dropped(struct ip_mc_list
*im
)
1197 struct in_device
*in_dev
= im
->interface
;
1198 #ifdef CONFIG_IP_MULTICAST
1199 struct net
*net
= dev_net(in_dev
->dev
);
1205 ip_mc_filter_del(in_dev
, im
->multiaddr
);
1208 #ifdef CONFIG_IP_MULTICAST
1209 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1211 if (ipv4_is_local_multicast(im
->multiaddr
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
1214 reporter
= im
->reporter
;
1215 igmp_stop_timer(im
);
1217 if (!in_dev
->dead
) {
1218 if (IGMP_V1_SEEN(in_dev
))
1220 if (IGMP_V2_SEEN(in_dev
)) {
1222 igmp_send_report(in_dev
, im
, IGMP_HOST_LEAVE_MESSAGE
);
1226 igmpv3_add_delrec(in_dev
, im
);
1228 igmp_ifc_event(in_dev
);
1233 static void igmp_group_added(struct ip_mc_list
*im
)
1235 struct in_device
*in_dev
= im
->interface
;
1236 #ifdef CONFIG_IP_MULTICAST
1237 struct net
*net
= dev_net(in_dev
->dev
);
1240 if (im
->loaded
== 0) {
1242 ip_mc_filter_add(in_dev
, im
->multiaddr
);
1245 #ifdef CONFIG_IP_MULTICAST
1246 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1248 if (ipv4_is_local_multicast(im
->multiaddr
) && !net
->ipv4
.sysctl_igmp_llm_reports
)
1253 if (IGMP_V1_SEEN(in_dev
) || IGMP_V2_SEEN(in_dev
)) {
1254 spin_lock_bh(&im
->lock
);
1255 igmp_start_timer(im
, IGMP_INITIAL_REPORT_DELAY
);
1256 spin_unlock_bh(&im
->lock
);
1261 im
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1262 igmp_ifc_event(in_dev
);
1268 * Multicast list managers
1271 static u32
ip_mc_hash(const struct ip_mc_list
*im
)
1273 return hash_32((__force u32
)im
->multiaddr
, MC_HASH_SZ_LOG
);
1276 static void ip_mc_hash_add(struct in_device
*in_dev
,
1277 struct ip_mc_list
*im
)
1279 struct ip_mc_list __rcu
**mc_hash
;
1282 mc_hash
= rtnl_dereference(in_dev
->mc_hash
);
1284 hash
= ip_mc_hash(im
);
1285 im
->next_hash
= mc_hash
[hash
];
1286 rcu_assign_pointer(mc_hash
[hash
], im
);
1290 /* do not use a hash table for small number of items */
1291 if (in_dev
->mc_count
< 4)
1294 mc_hash
= kzalloc(sizeof(struct ip_mc_list
*) << MC_HASH_SZ_LOG
,
1299 for_each_pmc_rtnl(in_dev
, im
) {
1300 hash
= ip_mc_hash(im
);
1301 im
->next_hash
= mc_hash
[hash
];
1302 RCU_INIT_POINTER(mc_hash
[hash
], im
);
1305 rcu_assign_pointer(in_dev
->mc_hash
, mc_hash
);
1308 static void ip_mc_hash_remove(struct in_device
*in_dev
,
1309 struct ip_mc_list
*im
)
1311 struct ip_mc_list __rcu
**mc_hash
= rtnl_dereference(in_dev
->mc_hash
);
1312 struct ip_mc_list
*aux
;
1316 mc_hash
+= ip_mc_hash(im
);
1317 while ((aux
= rtnl_dereference(*mc_hash
)) != im
)
1318 mc_hash
= &aux
->next_hash
;
1319 *mc_hash
= im
->next_hash
;
1324 * A socket has joined a multicast group on device dev.
1327 void ip_mc_inc_group(struct in_device
*in_dev
, __be32 addr
)
1329 struct ip_mc_list
*im
;
1330 #ifdef CONFIG_IP_MULTICAST
1331 struct net
*net
= dev_net(in_dev
->dev
);
1336 for_each_pmc_rtnl(in_dev
, im
) {
1337 if (im
->multiaddr
== addr
) {
1339 ip_mc_add_src(in_dev
, &addr
, MCAST_EXCLUDE
, 0, NULL
, 0);
1344 im
= kzalloc(sizeof(*im
), GFP_KERNEL
);
1349 im
->interface
= in_dev
;
1350 in_dev_hold(in_dev
);
1351 im
->multiaddr
= addr
;
1352 /* initial mode is (EX, empty) */
1353 im
->sfmode
= MCAST_EXCLUDE
;
1354 im
->sfcount
[MCAST_EXCLUDE
] = 1;
1355 atomic_set(&im
->refcnt
, 1);
1356 spin_lock_init(&im
->lock
);
1357 #ifdef CONFIG_IP_MULTICAST
1358 setup_timer(&im
->timer
, igmp_timer_expire
, (unsigned long)im
);
1359 im
->unsolicit_count
= net
->ipv4
.sysctl_igmp_qrv
;
1362 im
->next_rcu
= in_dev
->mc_list
;
1364 rcu_assign_pointer(in_dev
->mc_list
, im
);
1366 ip_mc_hash_add(in_dev
, im
);
1368 #ifdef CONFIG_IP_MULTICAST
1369 igmpv3_del_delrec(in_dev
, im
->multiaddr
);
1371 igmp_group_added(im
);
1373 ip_rt_multicast_event(in_dev
);
1377 EXPORT_SYMBOL(ip_mc_inc_group
);
1379 static int ip_mc_check_iphdr(struct sk_buff
*skb
)
1381 const struct iphdr
*iph
;
1383 unsigned int offset
= skb_network_offset(skb
) + sizeof(*iph
);
1385 if (!pskb_may_pull(skb
, offset
))
1390 if (iph
->version
!= 4 || ip_hdrlen(skb
) < sizeof(*iph
))
1393 offset
+= ip_hdrlen(skb
) - sizeof(*iph
);
1395 if (!pskb_may_pull(skb
, offset
))
1400 if (unlikely(ip_fast_csum((u8
*)iph
, iph
->ihl
)))
1403 len
= skb_network_offset(skb
) + ntohs(iph
->tot_len
);
1404 if (skb
->len
< len
|| len
< offset
)
1407 skb_set_transport_header(skb
, offset
);
1412 static int ip_mc_check_igmp_reportv3(struct sk_buff
*skb
)
1414 unsigned int len
= skb_transport_offset(skb
);
1416 len
+= sizeof(struct igmpv3_report
);
1418 return pskb_may_pull(skb
, len
) ? 0 : -EINVAL
;
1421 static int ip_mc_check_igmp_query(struct sk_buff
*skb
)
1423 unsigned int len
= skb_transport_offset(skb
);
1425 len
+= sizeof(struct igmphdr
);
1430 if (skb
->len
!= len
) {
1432 len
+= sizeof(struct igmpv3_query
) - sizeof(struct igmphdr
);
1433 if (skb
->len
< len
|| !pskb_may_pull(skb
, len
))
1437 /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer
1438 * all-systems destination addresses (224.0.0.1) for general queries
1440 if (!igmp_hdr(skb
)->group
&&
1441 ip_hdr(skb
)->daddr
!= htonl(INADDR_ALLHOSTS_GROUP
))
1447 static int ip_mc_check_igmp_msg(struct sk_buff
*skb
)
1449 switch (igmp_hdr(skb
)->type
) {
1450 case IGMP_HOST_LEAVE_MESSAGE
:
1451 case IGMP_HOST_MEMBERSHIP_REPORT
:
1452 case IGMPV2_HOST_MEMBERSHIP_REPORT
:
1455 case IGMPV3_HOST_MEMBERSHIP_REPORT
:
1456 return ip_mc_check_igmp_reportv3(skb
);
1457 case IGMP_HOST_MEMBERSHIP_QUERY
:
1458 return ip_mc_check_igmp_query(skb
);
1464 static inline __sum16
ip_mc_validate_checksum(struct sk_buff
*skb
)
1466 return skb_checksum_simple_validate(skb
);
1469 static int __ip_mc_check_igmp(struct sk_buff
*skb
, struct sk_buff
**skb_trimmed
)
1472 struct sk_buff
*skb_chk
;
1473 unsigned int transport_len
;
1474 unsigned int len
= skb_transport_offset(skb
) + sizeof(struct igmphdr
);
1477 transport_len
= ntohs(ip_hdr(skb
)->tot_len
) - ip_hdrlen(skb
);
1479 skb_chk
= skb_checksum_trimmed(skb
, transport_len
,
1480 ip_mc_validate_checksum
);
1484 if (!pskb_may_pull(skb_chk
, len
))
1487 ret
= ip_mc_check_igmp_msg(skb_chk
);
1492 *skb_trimmed
= skb_chk
;
1493 /* free now unneeded clone */
1494 else if (skb_chk
!= skb
)
1500 if (ret
&& skb_chk
&& skb_chk
!= skb
)
1507 * ip_mc_check_igmp - checks whether this is a sane IGMP packet
1508 * @skb: the skb to validate
1509 * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional)
1511 * Checks whether an IPv4 packet is a valid IGMP packet. If so sets
1512 * skb transport header accordingly and returns zero.
1514 * -EINVAL: A broken packet was detected, i.e. it violates some internet
1516 * -ENOMSG: IP header validation succeeded but it is not an IGMP packet.
1517 * -ENOMEM: A memory allocation failure happened.
1519 * Optionally, an skb pointer might be provided via skb_trimmed (or set it
1520 * to NULL): After parsing an IGMP packet successfully it will point to
1521 * an skb which has its tail aligned to the IP packet end. This might
1522 * either be the originally provided skb or a trimmed, cloned version if
1523 * the skb frame had data beyond the IP packet. A cloned skb allows us
1524 * to leave the original skb and its full frame unchanged (which might be
1525 * desirable for layer 2 frame jugglers).
1527 * Caller needs to set the skb network header and free any returned skb if it
1528 * differs from the provided skb.
1530 int ip_mc_check_igmp(struct sk_buff
*skb
, struct sk_buff
**skb_trimmed
)
1532 int ret
= ip_mc_check_iphdr(skb
);
1537 if (ip_hdr(skb
)->protocol
!= IPPROTO_IGMP
)
1540 return __ip_mc_check_igmp(skb
, skb_trimmed
);
1542 EXPORT_SYMBOL(ip_mc_check_igmp
);
1545 * Resend IGMP JOIN report; used by netdev notifier.
1547 static void ip_mc_rejoin_groups(struct in_device
*in_dev
)
1549 #ifdef CONFIG_IP_MULTICAST
1550 struct ip_mc_list
*im
;
1552 struct net
*net
= dev_net(in_dev
->dev
);
1556 for_each_pmc_rtnl(in_dev
, im
) {
1557 if (im
->multiaddr
== IGMP_ALL_HOSTS
)
1559 if (ipv4_is_local_multicast(im
->multiaddr
) &&
1560 !net
->ipv4
.sysctl_igmp_llm_reports
)
1563 /* a failover is happening and switches
1564 * must be notified immediately
1566 if (IGMP_V1_SEEN(in_dev
))
1567 type
= IGMP_HOST_MEMBERSHIP_REPORT
;
1568 else if (IGMP_V2_SEEN(in_dev
))
1569 type
= IGMPV2_HOST_MEMBERSHIP_REPORT
;
1571 type
= IGMPV3_HOST_MEMBERSHIP_REPORT
;
1572 igmp_send_report(in_dev
, im
, type
);
1578 * A socket has left a multicast group on device dev
1581 void ip_mc_dec_group(struct in_device
*in_dev
, __be32 addr
)
1583 struct ip_mc_list
*i
;
1584 struct ip_mc_list __rcu
**ip
;
1588 for (ip
= &in_dev
->mc_list
;
1589 (i
= rtnl_dereference(*ip
)) != NULL
;
1590 ip
= &i
->next_rcu
) {
1591 if (i
->multiaddr
== addr
) {
1592 if (--i
->users
== 0) {
1593 ip_mc_hash_remove(in_dev
, i
);
1596 igmp_group_dropped(i
);
1600 ip_rt_multicast_event(in_dev
);
1609 EXPORT_SYMBOL(ip_mc_dec_group
);
1611 /* Device changing type */
1613 void ip_mc_unmap(struct in_device
*in_dev
)
1615 struct ip_mc_list
*pmc
;
1619 for_each_pmc_rtnl(in_dev
, pmc
)
1620 igmp_group_dropped(pmc
);
1623 void ip_mc_remap(struct in_device
*in_dev
)
1625 struct ip_mc_list
*pmc
;
1629 for_each_pmc_rtnl(in_dev
, pmc
)
1630 igmp_group_added(pmc
);
1633 /* Device going down */
1635 void ip_mc_down(struct in_device
*in_dev
)
1637 struct ip_mc_list
*pmc
;
1641 for_each_pmc_rtnl(in_dev
, pmc
)
1642 igmp_group_dropped(pmc
);
1644 #ifdef CONFIG_IP_MULTICAST
1645 in_dev
->mr_ifc_count
= 0;
1646 if (del_timer(&in_dev
->mr_ifc_timer
))
1647 __in_dev_put(in_dev
);
1648 in_dev
->mr_gq_running
= 0;
1649 if (del_timer(&in_dev
->mr_gq_timer
))
1650 __in_dev_put(in_dev
);
1651 igmpv3_clear_delrec(in_dev
);
1654 ip_mc_dec_group(in_dev
, IGMP_ALL_HOSTS
);
1657 void ip_mc_init_dev(struct in_device
*in_dev
)
1659 #ifdef CONFIG_IP_MULTICAST
1660 struct net
*net
= dev_net(in_dev
->dev
);
1664 #ifdef CONFIG_IP_MULTICAST
1665 setup_timer(&in_dev
->mr_gq_timer
, igmp_gq_timer_expire
,
1666 (unsigned long)in_dev
);
1667 setup_timer(&in_dev
->mr_ifc_timer
, igmp_ifc_timer_expire
,
1668 (unsigned long)in_dev
);
1669 in_dev
->mr_qrv
= net
->ipv4
.sysctl_igmp_qrv
;
1672 spin_lock_init(&in_dev
->mc_tomb_lock
);
1675 /* Device going up */
1677 void ip_mc_up(struct in_device
*in_dev
)
1679 struct ip_mc_list
*pmc
;
1680 #ifdef CONFIG_IP_MULTICAST
1681 struct net
*net
= dev_net(in_dev
->dev
);
1686 #ifdef CONFIG_IP_MULTICAST
1687 in_dev
->mr_qrv
= net
->ipv4
.sysctl_igmp_qrv
;
1689 ip_mc_inc_group(in_dev
, IGMP_ALL_HOSTS
);
1691 for_each_pmc_rtnl(in_dev
, pmc
)
1692 igmp_group_added(pmc
);
1696 * Device is about to be destroyed: clean up.
1699 void ip_mc_destroy_dev(struct in_device
*in_dev
)
1701 struct ip_mc_list
*i
;
1705 /* Deactivate timers */
1708 while ((i
= rtnl_dereference(in_dev
->mc_list
)) != NULL
) {
1709 in_dev
->mc_list
= i
->next_rcu
;
1712 /* We've dropped the groups in ip_mc_down already */
1718 /* RTNL is locked */
1719 static struct in_device
*ip_mc_find_dev(struct net
*net
, struct ip_mreqn
*imr
)
1721 struct net_device
*dev
= NULL
;
1722 struct in_device
*idev
= NULL
;
1724 if (imr
->imr_ifindex
) {
1725 idev
= inetdev_by_index(net
, imr
->imr_ifindex
);
1728 if (imr
->imr_address
.s_addr
) {
1729 dev
= __ip_dev_find(net
, imr
->imr_address
.s_addr
, false);
1735 struct rtable
*rt
= ip_route_output(net
,
1736 imr
->imr_multiaddr
.s_addr
,
1744 imr
->imr_ifindex
= dev
->ifindex
;
1745 idev
= __in_dev_get_rtnl(dev
);
1751 * Join a socket to a group
1754 static int ip_mc_del1_src(struct ip_mc_list
*pmc
, int sfmode
,
1757 struct ip_sf_list
*psf
, *psf_prev
;
1761 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1762 if (psf
->sf_inaddr
== *psfsrc
)
1766 if (!psf
|| psf
->sf_count
[sfmode
] == 0) {
1767 /* source filter not found, or count wrong => bug */
1770 psf
->sf_count
[sfmode
]--;
1771 if (psf
->sf_count
[sfmode
] == 0) {
1772 ip_rt_multicast_event(pmc
->interface
);
1774 if (!psf
->sf_count
[MCAST_INCLUDE
] && !psf
->sf_count
[MCAST_EXCLUDE
]) {
1775 #ifdef CONFIG_IP_MULTICAST
1776 struct in_device
*in_dev
= pmc
->interface
;
1777 struct net
*net
= dev_net(in_dev
->dev
);
1780 /* no more filters for this source */
1782 psf_prev
->sf_next
= psf
->sf_next
;
1784 pmc
->sources
= psf
->sf_next
;
1785 #ifdef CONFIG_IP_MULTICAST
1786 if (psf
->sf_oldin
&&
1787 !IGMP_V1_SEEN(in_dev
) && !IGMP_V2_SEEN(in_dev
)) {
1788 psf
->sf_crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1789 psf
->sf_next
= pmc
->tomb
;
1799 #ifndef CONFIG_IP_MULTICAST
1800 #define igmp_ifc_event(x) do { } while (0)
1803 static int ip_mc_del_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1804 int sfcount
, __be32
*psfsrc
, int delta
)
1806 struct ip_mc_list
*pmc
;
1813 for_each_pmc_rcu(in_dev
, pmc
) {
1814 if (*pmca
== pmc
->multiaddr
)
1818 /* MCA not found?? bug */
1822 spin_lock_bh(&pmc
->lock
);
1824 #ifdef CONFIG_IP_MULTICAST
1829 if (!pmc
->sfcount
[sfmode
])
1831 pmc
->sfcount
[sfmode
]--;
1834 for (i
= 0; i
< sfcount
; i
++) {
1835 int rv
= ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[i
]);
1837 changerec
|= rv
> 0;
1841 if (pmc
->sfmode
== MCAST_EXCLUDE
&&
1842 pmc
->sfcount
[MCAST_EXCLUDE
] == 0 &&
1843 pmc
->sfcount
[MCAST_INCLUDE
]) {
1844 #ifdef CONFIG_IP_MULTICAST
1845 struct ip_sf_list
*psf
;
1846 struct net
*net
= dev_net(in_dev
->dev
);
1849 /* filter mode change */
1850 pmc
->sfmode
= MCAST_INCLUDE
;
1851 #ifdef CONFIG_IP_MULTICAST
1852 pmc
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
1853 in_dev
->mr_ifc_count
= pmc
->crcount
;
1854 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1855 psf
->sf_crcount
= 0;
1856 igmp_ifc_event(pmc
->interface
);
1857 } else if (sf_setstate(pmc
) || changerec
) {
1858 igmp_ifc_event(pmc
->interface
);
1862 spin_unlock_bh(&pmc
->lock
);
1867 * Add multicast single-source filter to the interface list
1869 static int ip_mc_add1_src(struct ip_mc_list
*pmc
, int sfmode
,
1872 struct ip_sf_list
*psf
, *psf_prev
;
1875 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1876 if (psf
->sf_inaddr
== *psfsrc
)
1881 psf
= kzalloc(sizeof(*psf
), GFP_ATOMIC
);
1884 psf
->sf_inaddr
= *psfsrc
;
1886 psf_prev
->sf_next
= psf
;
1890 psf
->sf_count
[sfmode
]++;
1891 if (psf
->sf_count
[sfmode
] == 1) {
1892 ip_rt_multicast_event(pmc
->interface
);
1897 #ifdef CONFIG_IP_MULTICAST
1898 static void sf_markstate(struct ip_mc_list
*pmc
)
1900 struct ip_sf_list
*psf
;
1901 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1903 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
1904 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1905 psf
->sf_oldin
= mca_xcount
==
1906 psf
->sf_count
[MCAST_EXCLUDE
] &&
1907 !psf
->sf_count
[MCAST_INCLUDE
];
1909 psf
->sf_oldin
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1912 static int sf_setstate(struct ip_mc_list
*pmc
)
1914 struct ip_sf_list
*psf
, *dpsf
;
1915 int mca_xcount
= pmc
->sfcount
[MCAST_EXCLUDE
];
1916 int qrv
= pmc
->interface
->mr_qrv
;
1920 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
) {
1921 if (pmc
->sfcount
[MCAST_EXCLUDE
]) {
1922 new_in
= mca_xcount
== psf
->sf_count
[MCAST_EXCLUDE
] &&
1923 !psf
->sf_count
[MCAST_INCLUDE
];
1925 new_in
= psf
->sf_count
[MCAST_INCLUDE
] != 0;
1927 if (!psf
->sf_oldin
) {
1928 struct ip_sf_list
*prev
= NULL
;
1930 for (dpsf
= pmc
->tomb
; dpsf
; dpsf
= dpsf
->sf_next
) {
1931 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1937 prev
->sf_next
= dpsf
->sf_next
;
1939 pmc
->tomb
= dpsf
->sf_next
;
1942 psf
->sf_crcount
= qrv
;
1945 } else if (psf
->sf_oldin
) {
1947 psf
->sf_crcount
= 0;
1949 * add or update "delete" records if an active filter
1952 for (dpsf
= pmc
->tomb
; dpsf
; dpsf
= dpsf
->sf_next
)
1953 if (dpsf
->sf_inaddr
== psf
->sf_inaddr
)
1956 dpsf
= kmalloc(sizeof(*dpsf
), GFP_ATOMIC
);
1960 /* pmc->lock held by callers */
1961 dpsf
->sf_next
= pmc
->tomb
;
1964 dpsf
->sf_crcount
= qrv
;
1973 * Add multicast source filter list to the interface list
1975 static int ip_mc_add_src(struct in_device
*in_dev
, __be32
*pmca
, int sfmode
,
1976 int sfcount
, __be32
*psfsrc
, int delta
)
1978 struct ip_mc_list
*pmc
;
1985 for_each_pmc_rcu(in_dev
, pmc
) {
1986 if (*pmca
== pmc
->multiaddr
)
1990 /* MCA not found?? bug */
1994 spin_lock_bh(&pmc
->lock
);
1997 #ifdef CONFIG_IP_MULTICAST
2000 isexclude
= pmc
->sfmode
== MCAST_EXCLUDE
;
2002 pmc
->sfcount
[sfmode
]++;
2004 for (i
= 0; i
< sfcount
; i
++) {
2005 err
= ip_mc_add1_src(pmc
, sfmode
, &psfsrc
[i
]);
2013 pmc
->sfcount
[sfmode
]--;
2014 for (j
= 0; j
< i
; j
++)
2015 (void) ip_mc_del1_src(pmc
, sfmode
, &psfsrc
[j
]);
2016 } else if (isexclude
!= (pmc
->sfcount
[MCAST_EXCLUDE
] != 0)) {
2017 #ifdef CONFIG_IP_MULTICAST
2018 struct ip_sf_list
*psf
;
2019 struct net
*net
= dev_net(pmc
->interface
->dev
);
2020 in_dev
= pmc
->interface
;
2023 /* filter mode change */
2024 if (pmc
->sfcount
[MCAST_EXCLUDE
])
2025 pmc
->sfmode
= MCAST_EXCLUDE
;
2026 else if (pmc
->sfcount
[MCAST_INCLUDE
])
2027 pmc
->sfmode
= MCAST_INCLUDE
;
2028 #ifdef CONFIG_IP_MULTICAST
2029 /* else no filters; keep old mode for reports */
2031 pmc
->crcount
= in_dev
->mr_qrv
?: net
->ipv4
.sysctl_igmp_qrv
;
2032 in_dev
->mr_ifc_count
= pmc
->crcount
;
2033 for (psf
= pmc
->sources
; psf
; psf
= psf
->sf_next
)
2034 psf
->sf_crcount
= 0;
2035 igmp_ifc_event(in_dev
);
2036 } else if (sf_setstate(pmc
)) {
2037 igmp_ifc_event(in_dev
);
2040 spin_unlock_bh(&pmc
->lock
);
2044 static void ip_mc_clear_src(struct ip_mc_list
*pmc
)
2046 struct ip_sf_list
*psf
, *nextpsf
;
2048 for (psf
= pmc
->tomb
; psf
; psf
= nextpsf
) {
2049 nextpsf
= psf
->sf_next
;
2053 for (psf
= pmc
->sources
; psf
; psf
= nextpsf
) {
2054 nextpsf
= psf
->sf_next
;
2057 pmc
->sources
= NULL
;
2058 pmc
->sfmode
= MCAST_EXCLUDE
;
2059 pmc
->sfcount
[MCAST_INCLUDE
] = 0;
2060 pmc
->sfcount
[MCAST_EXCLUDE
] = 1;
2063 /* Join a multicast group
2066 int ip_mc_join_group(struct sock
*sk
, struct ip_mreqn
*imr
)
2068 __be32 addr
= imr
->imr_multiaddr
.s_addr
;
2069 struct ip_mc_socklist
*iml
, *i
;
2070 struct in_device
*in_dev
;
2071 struct inet_sock
*inet
= inet_sk(sk
);
2072 struct net
*net
= sock_net(sk
);
2079 if (!ipv4_is_multicast(addr
))
2082 in_dev
= ip_mc_find_dev(net
, imr
);
2090 ifindex
= imr
->imr_ifindex
;
2091 for_each_pmc_rtnl(inet
, i
) {
2092 if (i
->multi
.imr_multiaddr
.s_addr
== addr
&&
2093 i
->multi
.imr_ifindex
== ifindex
)
2098 if (count
>= net
->ipv4
.sysctl_igmp_max_memberships
)
2100 iml
= sock_kmalloc(sk
, sizeof(*iml
), GFP_KERNEL
);
2104 memcpy(&iml
->multi
, imr
, sizeof(*imr
));
2105 iml
->next_rcu
= inet
->mc_list
;
2107 iml
->sfmode
= MCAST_EXCLUDE
;
2108 rcu_assign_pointer(inet
->mc_list
, iml
);
2109 ip_mc_inc_group(in_dev
, addr
);
2114 EXPORT_SYMBOL(ip_mc_join_group
);
2116 static int ip_mc_leave_src(struct sock
*sk
, struct ip_mc_socklist
*iml
,
2117 struct in_device
*in_dev
)
2119 struct ip_sf_socklist
*psf
= rtnl_dereference(iml
->sflist
);
2123 /* any-source empty exclude case */
2124 return ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
2125 iml
->sfmode
, 0, NULL
, 0);
2127 err
= ip_mc_del_src(in_dev
, &iml
->multi
.imr_multiaddr
.s_addr
,
2128 iml
->sfmode
, psf
->sl_count
, psf
->sl_addr
, 0);
2129 RCU_INIT_POINTER(iml
->sflist
, NULL
);
2130 /* decrease mem now to avoid the memleak warning */
2131 atomic_sub(IP_SFLSIZE(psf
->sl_max
), &sk
->sk_omem_alloc
);
2132 kfree_rcu(psf
, rcu
);
2136 int ip_mc_leave_group(struct sock
*sk
, struct ip_mreqn
*imr
)
2138 struct inet_sock
*inet
= inet_sk(sk
);
2139 struct ip_mc_socklist
*iml
;
2140 struct ip_mc_socklist __rcu
**imlp
;
2141 struct in_device
*in_dev
;
2142 struct net
*net
= sock_net(sk
);
2143 __be32 group
= imr
->imr_multiaddr
.s_addr
;
2145 int ret
= -EADDRNOTAVAIL
;
2149 in_dev
= ip_mc_find_dev(net
, imr
);
2150 if (!imr
->imr_ifindex
&& !imr
->imr_address
.s_addr
&& !in_dev
) {
2154 ifindex
= imr
->imr_ifindex
;
2155 for (imlp
= &inet
->mc_list
;
2156 (iml
= rtnl_dereference(*imlp
)) != NULL
;
2157 imlp
= &iml
->next_rcu
) {
2158 if (iml
->multi
.imr_multiaddr
.s_addr
!= group
)
2161 if (iml
->multi
.imr_ifindex
!= ifindex
)
2163 } else if (imr
->imr_address
.s_addr
&& imr
->imr_address
.s_addr
!=
2164 iml
->multi
.imr_address
.s_addr
)
2167 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2169 *imlp
= iml
->next_rcu
;
2172 ip_mc_dec_group(in_dev
, group
);
2174 /* decrease mem now to avoid the memleak warning */
2175 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2176 kfree_rcu(iml
, rcu
);
2182 EXPORT_SYMBOL(ip_mc_leave_group
);
2184 int ip_mc_source(int add
, int omode
, struct sock
*sk
, struct
2185 ip_mreq_source
*mreqs
, int ifindex
)
2188 struct ip_mreqn imr
;
2189 __be32 addr
= mreqs
->imr_multiaddr
;
2190 struct ip_mc_socklist
*pmc
;
2191 struct in_device
*in_dev
= NULL
;
2192 struct inet_sock
*inet
= inet_sk(sk
);
2193 struct ip_sf_socklist
*psl
;
2194 struct net
*net
= sock_net(sk
);
2198 if (!ipv4_is_multicast(addr
))
2203 imr
.imr_multiaddr
.s_addr
= mreqs
->imr_multiaddr
;
2204 imr
.imr_address
.s_addr
= mreqs
->imr_interface
;
2205 imr
.imr_ifindex
= ifindex
;
2206 in_dev
= ip_mc_find_dev(net
, &imr
);
2212 err
= -EADDRNOTAVAIL
;
2214 for_each_pmc_rtnl(inet
, pmc
) {
2215 if ((pmc
->multi
.imr_multiaddr
.s_addr
==
2216 imr
.imr_multiaddr
.s_addr
) &&
2217 (pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
))
2220 if (!pmc
) { /* must have a prior join */
2224 /* if a source filter was set, must be the same mode as before */
2226 if (pmc
->sfmode
!= omode
) {
2230 } else if (pmc
->sfmode
!= omode
) {
2231 /* allow mode switches for empty-set filters */
2232 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 0, NULL
, 0);
2233 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, pmc
->sfmode
, 0,
2235 pmc
->sfmode
= omode
;
2238 psl
= rtnl_dereference(pmc
->sflist
);
2241 goto done
; /* err = -EADDRNOTAVAIL */
2243 for (i
= 0; i
< psl
->sl_count
; i
++) {
2244 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2249 if (rv
) /* source not found */
2250 goto done
; /* err = -EADDRNOTAVAIL */
2252 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2253 if (psl
->sl_count
== 1 && omode
== MCAST_INCLUDE
) {
2258 /* update the interface filter */
2259 ip_mc_del_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2260 &mreqs
->imr_sourceaddr
, 1);
2262 for (j
= i
+1; j
< psl
->sl_count
; j
++)
2263 psl
->sl_addr
[j
-1] = psl
->sl_addr
[j
];
2268 /* else, add a new source to the filter */
2270 if (psl
&& psl
->sl_count
>= net
->ipv4
.sysctl_igmp_max_msf
) {
2274 if (!psl
|| psl
->sl_count
== psl
->sl_max
) {
2275 struct ip_sf_socklist
*newpsl
;
2276 int count
= IP_SFBLOCK
;
2279 count
+= psl
->sl_max
;
2280 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(count
), GFP_KERNEL
);
2285 newpsl
->sl_max
= count
;
2286 newpsl
->sl_count
= count
- IP_SFBLOCK
;
2288 for (i
= 0; i
< psl
->sl_count
; i
++)
2289 newpsl
->sl_addr
[i
] = psl
->sl_addr
[i
];
2290 /* decrease mem now to avoid the memleak warning */
2291 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2292 kfree_rcu(psl
, rcu
);
2294 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2297 rv
= 1; /* > 0 for insert logic below if sl_count is 0 */
2298 for (i
= 0; i
< psl
->sl_count
; i
++) {
2299 rv
= memcmp(&psl
->sl_addr
[i
], &mreqs
->imr_sourceaddr
,
2304 if (rv
== 0) /* address already there is an error */
2306 for (j
= psl
->sl_count
-1; j
>= i
; j
--)
2307 psl
->sl_addr
[j
+1] = psl
->sl_addr
[j
];
2308 psl
->sl_addr
[i
] = mreqs
->imr_sourceaddr
;
2311 /* update the interface list */
2312 ip_mc_add_src(in_dev
, &mreqs
->imr_multiaddr
, omode
, 1,
2313 &mreqs
->imr_sourceaddr
, 1);
2316 err
= ip_mc_leave_group(sk
, &imr
);
2320 int ip_mc_msfilter(struct sock
*sk
, struct ip_msfilter
*msf
, int ifindex
)
2323 struct ip_mreqn imr
;
2324 __be32 addr
= msf
->imsf_multiaddr
;
2325 struct ip_mc_socklist
*pmc
;
2326 struct in_device
*in_dev
;
2327 struct inet_sock
*inet
= inet_sk(sk
);
2328 struct ip_sf_socklist
*newpsl
, *psl
;
2329 struct net
*net
= sock_net(sk
);
2332 if (!ipv4_is_multicast(addr
))
2334 if (msf
->imsf_fmode
!= MCAST_INCLUDE
&&
2335 msf
->imsf_fmode
!= MCAST_EXCLUDE
)
2340 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2341 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2342 imr
.imr_ifindex
= ifindex
;
2343 in_dev
= ip_mc_find_dev(net
, &imr
);
2350 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2351 if (msf
->imsf_fmode
== MCAST_INCLUDE
&& msf
->imsf_numsrc
== 0) {
2356 for_each_pmc_rtnl(inet
, pmc
) {
2357 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2358 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2361 if (!pmc
) { /* must have a prior join */
2365 if (msf
->imsf_numsrc
) {
2366 newpsl
= sock_kmalloc(sk
, IP_SFLSIZE(msf
->imsf_numsrc
),
2372 newpsl
->sl_max
= newpsl
->sl_count
= msf
->imsf_numsrc
;
2373 memcpy(newpsl
->sl_addr
, msf
->imsf_slist
,
2374 msf
->imsf_numsrc
* sizeof(msf
->imsf_slist
[0]));
2375 err
= ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2376 msf
->imsf_fmode
, newpsl
->sl_count
, newpsl
->sl_addr
, 0);
2378 sock_kfree_s(sk
, newpsl
, IP_SFLSIZE(newpsl
->sl_max
));
2383 (void) ip_mc_add_src(in_dev
, &msf
->imsf_multiaddr
,
2384 msf
->imsf_fmode
, 0, NULL
, 0);
2386 psl
= rtnl_dereference(pmc
->sflist
);
2388 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2389 psl
->sl_count
, psl
->sl_addr
, 0);
2390 /* decrease mem now to avoid the memleak warning */
2391 atomic_sub(IP_SFLSIZE(psl
->sl_max
), &sk
->sk_omem_alloc
);
2392 kfree_rcu(psl
, rcu
);
2394 (void) ip_mc_del_src(in_dev
, &msf
->imsf_multiaddr
, pmc
->sfmode
,
2396 rcu_assign_pointer(pmc
->sflist
, newpsl
);
2397 pmc
->sfmode
= msf
->imsf_fmode
;
2401 err
= ip_mc_leave_group(sk
, &imr
);
2405 int ip_mc_msfget(struct sock
*sk
, struct ip_msfilter
*msf
,
2406 struct ip_msfilter __user
*optval
, int __user
*optlen
)
2408 int err
, len
, count
, copycount
;
2409 struct ip_mreqn imr
;
2410 __be32 addr
= msf
->imsf_multiaddr
;
2411 struct ip_mc_socklist
*pmc
;
2412 struct in_device
*in_dev
;
2413 struct inet_sock
*inet
= inet_sk(sk
);
2414 struct ip_sf_socklist
*psl
;
2415 struct net
*net
= sock_net(sk
);
2419 if (!ipv4_is_multicast(addr
))
2422 imr
.imr_multiaddr
.s_addr
= msf
->imsf_multiaddr
;
2423 imr
.imr_address
.s_addr
= msf
->imsf_interface
;
2424 imr
.imr_ifindex
= 0;
2425 in_dev
= ip_mc_find_dev(net
, &imr
);
2431 err
= -EADDRNOTAVAIL
;
2433 for_each_pmc_rtnl(inet
, pmc
) {
2434 if (pmc
->multi
.imr_multiaddr
.s_addr
== msf
->imsf_multiaddr
&&
2435 pmc
->multi
.imr_ifindex
== imr
.imr_ifindex
)
2438 if (!pmc
) /* must have a prior join */
2440 msf
->imsf_fmode
= pmc
->sfmode
;
2441 psl
= rtnl_dereference(pmc
->sflist
);
2446 count
= psl
->sl_count
;
2448 copycount
= count
< msf
->imsf_numsrc
? count
: msf
->imsf_numsrc
;
2449 len
= copycount
* sizeof(psl
->sl_addr
[0]);
2450 msf
->imsf_numsrc
= count
;
2451 if (put_user(IP_MSFILTER_SIZE(copycount
), optlen
) ||
2452 copy_to_user(optval
, msf
, IP_MSFILTER_SIZE(0))) {
2456 copy_to_user(&optval
->imsf_slist
[0], psl
->sl_addr
, len
))
2463 int ip_mc_gsfget(struct sock
*sk
, struct group_filter
*gsf
,
2464 struct group_filter __user
*optval
, int __user
*optlen
)
2466 int err
, i
, count
, copycount
;
2467 struct sockaddr_in
*psin
;
2469 struct ip_mc_socklist
*pmc
;
2470 struct inet_sock
*inet
= inet_sk(sk
);
2471 struct ip_sf_socklist
*psl
;
2475 psin
= (struct sockaddr_in
*)&gsf
->gf_group
;
2476 if (psin
->sin_family
!= AF_INET
)
2478 addr
= psin
->sin_addr
.s_addr
;
2479 if (!ipv4_is_multicast(addr
))
2482 err
= -EADDRNOTAVAIL
;
2484 for_each_pmc_rtnl(inet
, pmc
) {
2485 if (pmc
->multi
.imr_multiaddr
.s_addr
== addr
&&
2486 pmc
->multi
.imr_ifindex
== gsf
->gf_interface
)
2489 if (!pmc
) /* must have a prior join */
2491 gsf
->gf_fmode
= pmc
->sfmode
;
2492 psl
= rtnl_dereference(pmc
->sflist
);
2493 count
= psl
? psl
->sl_count
: 0;
2494 copycount
= count
< gsf
->gf_numsrc
? count
: gsf
->gf_numsrc
;
2495 gsf
->gf_numsrc
= count
;
2496 if (put_user(GROUP_FILTER_SIZE(copycount
), optlen
) ||
2497 copy_to_user(optval
, gsf
, GROUP_FILTER_SIZE(0))) {
2500 for (i
= 0; i
< copycount
; i
++) {
2501 struct sockaddr_storage ss
;
2503 psin
= (struct sockaddr_in
*)&ss
;
2504 memset(&ss
, 0, sizeof(ss
));
2505 psin
->sin_family
= AF_INET
;
2506 psin
->sin_addr
.s_addr
= psl
->sl_addr
[i
];
2507 if (copy_to_user(&optval
->gf_slist
[i
], &ss
, sizeof(ss
)))
2516 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2518 int ip_mc_sf_allow(struct sock
*sk
, __be32 loc_addr
, __be32 rmt_addr
, int dif
)
2520 struct inet_sock
*inet
= inet_sk(sk
);
2521 struct ip_mc_socklist
*pmc
;
2522 struct ip_sf_socklist
*psl
;
2527 if (!ipv4_is_multicast(loc_addr
))
2531 for_each_pmc_rcu(inet
, pmc
) {
2532 if (pmc
->multi
.imr_multiaddr
.s_addr
== loc_addr
&&
2533 pmc
->multi
.imr_ifindex
== dif
)
2539 psl
= rcu_dereference(pmc
->sflist
);
2540 ret
= (pmc
->sfmode
== MCAST_EXCLUDE
);
2544 for (i
= 0; i
< psl
->sl_count
; i
++) {
2545 if (psl
->sl_addr
[i
] == rmt_addr
)
2549 if (pmc
->sfmode
== MCAST_INCLUDE
&& i
>= psl
->sl_count
)
2551 if (pmc
->sfmode
== MCAST_EXCLUDE
&& i
< psl
->sl_count
)
2561 * A socket is closing.
2564 void ip_mc_drop_socket(struct sock
*sk
)
2566 struct inet_sock
*inet
= inet_sk(sk
);
2567 struct ip_mc_socklist
*iml
;
2568 struct net
*net
= sock_net(sk
);
2574 while ((iml
= rtnl_dereference(inet
->mc_list
)) != NULL
) {
2575 struct in_device
*in_dev
;
2577 inet
->mc_list
= iml
->next_rcu
;
2578 in_dev
= inetdev_by_index(net
, iml
->multi
.imr_ifindex
);
2579 (void) ip_mc_leave_src(sk
, iml
, in_dev
);
2581 ip_mc_dec_group(in_dev
, iml
->multi
.imr_multiaddr
.s_addr
);
2582 /* decrease mem now to avoid the memleak warning */
2583 atomic_sub(sizeof(*iml
), &sk
->sk_omem_alloc
);
2584 kfree_rcu(iml
, rcu
);
2589 /* called with rcu_read_lock() */
2590 int ip_check_mc_rcu(struct in_device
*in_dev
, __be32 mc_addr
, __be32 src_addr
, u8 proto
)
2592 struct ip_mc_list
*im
;
2593 struct ip_mc_list __rcu
**mc_hash
;
2594 struct ip_sf_list
*psf
;
2597 mc_hash
= rcu_dereference(in_dev
->mc_hash
);
2599 u32 hash
= hash_32((__force u32
)mc_addr
, MC_HASH_SZ_LOG
);
2601 for (im
= rcu_dereference(mc_hash
[hash
]);
2603 im
= rcu_dereference(im
->next_hash
)) {
2604 if (im
->multiaddr
== mc_addr
)
2608 for_each_pmc_rcu(in_dev
, im
) {
2609 if (im
->multiaddr
== mc_addr
)
2613 if (im
&& proto
== IPPROTO_IGMP
) {
2617 for (psf
= im
->sources
; psf
; psf
= psf
->sf_next
) {
2618 if (psf
->sf_inaddr
== src_addr
)
2622 rv
= psf
->sf_count
[MCAST_INCLUDE
] ||
2623 psf
->sf_count
[MCAST_EXCLUDE
] !=
2624 im
->sfcount
[MCAST_EXCLUDE
];
2626 rv
= im
->sfcount
[MCAST_EXCLUDE
] != 0;
2628 rv
= 1; /* unspecified source; tentatively allow */
2633 #if defined(CONFIG_PROC_FS)
2634 struct igmp_mc_iter_state
{
2635 struct seq_net_private p
;
2636 struct net_device
*dev
;
2637 struct in_device
*in_dev
;
2640 #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2642 static inline struct ip_mc_list
*igmp_mc_get_first(struct seq_file
*seq
)
2644 struct net
*net
= seq_file_net(seq
);
2645 struct ip_mc_list
*im
= NULL
;
2646 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2648 state
->in_dev
= NULL
;
2649 for_each_netdev_rcu(net
, state
->dev
) {
2650 struct in_device
*in_dev
;
2652 in_dev
= __in_dev_get_rcu(state
->dev
);
2655 im
= rcu_dereference(in_dev
->mc_list
);
2657 state
->in_dev
= in_dev
;
2664 static struct ip_mc_list
*igmp_mc_get_next(struct seq_file
*seq
, struct ip_mc_list
*im
)
2666 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2668 im
= rcu_dereference(im
->next_rcu
);
2670 state
->dev
= next_net_device_rcu(state
->dev
);
2672 state
->in_dev
= NULL
;
2675 state
->in_dev
= __in_dev_get_rcu(state
->dev
);
2678 im
= rcu_dereference(state
->in_dev
->mc_list
);
2683 static struct ip_mc_list
*igmp_mc_get_idx(struct seq_file
*seq
, loff_t pos
)
2685 struct ip_mc_list
*im
= igmp_mc_get_first(seq
);
2687 while (pos
&& (im
= igmp_mc_get_next(seq
, im
)) != NULL
)
2689 return pos
? NULL
: im
;
2692 static void *igmp_mc_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2696 return *pos
? igmp_mc_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2699 static void *igmp_mc_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2701 struct ip_mc_list
*im
;
2702 if (v
== SEQ_START_TOKEN
)
2703 im
= igmp_mc_get_first(seq
);
2705 im
= igmp_mc_get_next(seq
, v
);
2710 static void igmp_mc_seq_stop(struct seq_file
*seq
, void *v
)
2713 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2715 state
->in_dev
= NULL
;
2720 static int igmp_mc_seq_show(struct seq_file
*seq
, void *v
)
2722 if (v
== SEQ_START_TOKEN
)
2724 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2726 struct ip_mc_list
*im
= (struct ip_mc_list
*)v
;
2727 struct igmp_mc_iter_state
*state
= igmp_mc_seq_private(seq
);
2731 #ifdef CONFIG_IP_MULTICAST
2732 querier
= IGMP_V1_SEEN(state
->in_dev
) ? "V1" :
2733 IGMP_V2_SEEN(state
->in_dev
) ? "V2" :
2739 if (rcu_access_pointer(state
->in_dev
->mc_list
) == im
) {
2740 seq_printf(seq
, "%d\t%-10s: %5d %7s\n",
2741 state
->dev
->ifindex
, state
->dev
->name
, state
->in_dev
->mc_count
, querier
);
2744 delta
= im
->timer
.expires
- jiffies
;
2746 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
2747 im
->multiaddr
, im
->users
,
2749 im
->tm_running
? jiffies_delta_to_clock_t(delta
) : 0,
2755 static const struct seq_operations igmp_mc_seq_ops
= {
2756 .start
= igmp_mc_seq_start
,
2757 .next
= igmp_mc_seq_next
,
2758 .stop
= igmp_mc_seq_stop
,
2759 .show
= igmp_mc_seq_show
,
2762 static int igmp_mc_seq_open(struct inode
*inode
, struct file
*file
)
2764 return seq_open_net(inode
, file
, &igmp_mc_seq_ops
,
2765 sizeof(struct igmp_mc_iter_state
));
2768 static const struct file_operations igmp_mc_seq_fops
= {
2769 .owner
= THIS_MODULE
,
2770 .open
= igmp_mc_seq_open
,
2772 .llseek
= seq_lseek
,
2773 .release
= seq_release_net
,
2776 struct igmp_mcf_iter_state
{
2777 struct seq_net_private p
;
2778 struct net_device
*dev
;
2779 struct in_device
*idev
;
2780 struct ip_mc_list
*im
;
2783 #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2785 static inline struct ip_sf_list
*igmp_mcf_get_first(struct seq_file
*seq
)
2787 struct net
*net
= seq_file_net(seq
);
2788 struct ip_sf_list
*psf
= NULL
;
2789 struct ip_mc_list
*im
= NULL
;
2790 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2794 for_each_netdev_rcu(net
, state
->dev
) {
2795 struct in_device
*idev
;
2796 idev
= __in_dev_get_rcu(state
->dev
);
2797 if (unlikely(!idev
))
2799 im
= rcu_dereference(idev
->mc_list
);
2801 spin_lock_bh(&im
->lock
);
2808 spin_unlock_bh(&im
->lock
);
2814 static struct ip_sf_list
*igmp_mcf_get_next(struct seq_file
*seq
, struct ip_sf_list
*psf
)
2816 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2820 spin_unlock_bh(&state
->im
->lock
);
2821 state
->im
= state
->im
->next
;
2822 while (!state
->im
) {
2823 state
->dev
= next_net_device_rcu(state
->dev
);
2828 state
->idev
= __in_dev_get_rcu(state
->dev
);
2831 state
->im
= rcu_dereference(state
->idev
->mc_list
);
2835 spin_lock_bh(&state
->im
->lock
);
2836 psf
= state
->im
->sources
;
2842 static struct ip_sf_list
*igmp_mcf_get_idx(struct seq_file
*seq
, loff_t pos
)
2844 struct ip_sf_list
*psf
= igmp_mcf_get_first(seq
);
2846 while (pos
&& (psf
= igmp_mcf_get_next(seq
, psf
)) != NULL
)
2848 return pos
? NULL
: psf
;
2851 static void *igmp_mcf_seq_start(struct seq_file
*seq
, loff_t
*pos
)
2855 return *pos
? igmp_mcf_get_idx(seq
, *pos
- 1) : SEQ_START_TOKEN
;
2858 static void *igmp_mcf_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
2860 struct ip_sf_list
*psf
;
2861 if (v
== SEQ_START_TOKEN
)
2862 psf
= igmp_mcf_get_first(seq
);
2864 psf
= igmp_mcf_get_next(seq
, v
);
2869 static void igmp_mcf_seq_stop(struct seq_file
*seq
, void *v
)
2872 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2873 if (likely(state
->im
)) {
2874 spin_unlock_bh(&state
->im
->lock
);
2882 static int igmp_mcf_seq_show(struct seq_file
*seq
, void *v
)
2884 struct ip_sf_list
*psf
= (struct ip_sf_list
*)v
;
2885 struct igmp_mcf_iter_state
*state
= igmp_mcf_seq_private(seq
);
2887 if (v
== SEQ_START_TOKEN
) {
2888 seq_puts(seq
, "Idx Device MCA SRC INC EXC\n");
2892 "0x%08x %6lu %6lu\n",
2893 state
->dev
->ifindex
, state
->dev
->name
,
2894 ntohl(state
->im
->multiaddr
),
2895 ntohl(psf
->sf_inaddr
),
2896 psf
->sf_count
[MCAST_INCLUDE
],
2897 psf
->sf_count
[MCAST_EXCLUDE
]);
2902 static const struct seq_operations igmp_mcf_seq_ops
= {
2903 .start
= igmp_mcf_seq_start
,
2904 .next
= igmp_mcf_seq_next
,
2905 .stop
= igmp_mcf_seq_stop
,
2906 .show
= igmp_mcf_seq_show
,
2909 static int igmp_mcf_seq_open(struct inode
*inode
, struct file
*file
)
2911 return seq_open_net(inode
, file
, &igmp_mcf_seq_ops
,
2912 sizeof(struct igmp_mcf_iter_state
));
2915 static const struct file_operations igmp_mcf_seq_fops
= {
2916 .owner
= THIS_MODULE
,
2917 .open
= igmp_mcf_seq_open
,
2919 .llseek
= seq_lseek
,
2920 .release
= seq_release_net
,
2923 static int __net_init
igmp_net_init(struct net
*net
)
2925 struct proc_dir_entry
*pde
;
2928 pde
= proc_create("igmp", S_IRUGO
, net
->proc_net
, &igmp_mc_seq_fops
);
2931 pde
= proc_create("mcfilter", S_IRUGO
, net
->proc_net
,
2932 &igmp_mcf_seq_fops
);
2935 err
= inet_ctl_sock_create(&net
->ipv4
.mc_autojoin_sk
, AF_INET
,
2936 SOCK_DGRAM
, 0, net
);
2938 pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n",
2943 /* Sysctl initialization */
2944 net
->ipv4
.sysctl_igmp_max_memberships
= 20;
2945 net
->ipv4
.sysctl_igmp_max_msf
= 10;
2946 /* IGMP reports for link-local multicast groups are enabled by default */
2947 net
->ipv4
.sysctl_igmp_llm_reports
= 1;
2948 net
->ipv4
.sysctl_igmp_qrv
= 2;
2952 remove_proc_entry("mcfilter", net
->proc_net
);
2954 remove_proc_entry("igmp", net
->proc_net
);
2959 static void __net_exit
igmp_net_exit(struct net
*net
)
2961 remove_proc_entry("mcfilter", net
->proc_net
);
2962 remove_proc_entry("igmp", net
->proc_net
);
2963 inet_ctl_sock_destroy(net
->ipv4
.mc_autojoin_sk
);
2966 static struct pernet_operations igmp_net_ops
= {
2967 .init
= igmp_net_init
,
2968 .exit
= igmp_net_exit
,
2972 static int igmp_netdev_event(struct notifier_block
*this,
2973 unsigned long event
, void *ptr
)
2975 struct net_device
*dev
= netdev_notifier_info_to_dev(ptr
);
2976 struct in_device
*in_dev
;
2979 case NETDEV_RESEND_IGMP
:
2980 in_dev
= __in_dev_get_rtnl(dev
);
2982 ip_mc_rejoin_groups(in_dev
);
2990 static struct notifier_block igmp_notifier
= {
2991 .notifier_call
= igmp_netdev_event
,
2994 int __init
igmp_mc_init(void)
2996 #if defined(CONFIG_PROC_FS)
2999 err
= register_pernet_subsys(&igmp_net_ops
);
3002 err
= register_netdevice_notifier(&igmp_notifier
);
3004 goto reg_notif_fail
;
3008 unregister_pernet_subsys(&igmp_net_ops
);
3011 return register_netdevice_notifier(&igmp_notifier
);