blob: 736ab70fd17981c95085ee0fad163aaeca39133c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Linux NET3: Internet Group Management Protocol [IGMP]
3 *
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.
6 *
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.
10 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * Authors:
Alan Cox113aa832008-10-13 19:01:08 -070012 * Alan Cox <alan@lxorguk.ukuu.org.uk>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
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.
18 *
19 * Fixes:
20 *
21 * Alan Cox : Added lots of __inline__ to optimise
22 * the memory usage of all the tiny little
23 * functions.
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
32 * points.
33 *
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
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090036 * The enhancements are mainly based on Steve Deering's
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 * 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
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090050 * memberships but was being deleted,
51 * which caused a "del_timer() called
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 * from %p with timer not initialized\n"
53 * message (960131).
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090054 * Christian Daudt : removed del_timer from
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 * igmp_timer_expire function (960205).
56 * Christian Daudt : igmp_heard_report now only calls
57 * igmp_timer_expire if tm->running is
58 * true (960216).
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
70 * Vinay Kulkarni
71 */
72
Linus Torvalds1da177e2005-04-16 15:20:36 -070073#include <linux/module.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090074#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070075#include <asm/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070076#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>
82#include <linux/in.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>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020091
Eric W. Biederman457c4cb2007-09-12 12:01:34 +020092#include <net/net_namespace.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020093#include <net/arp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070094#include <net/ip.h>
95#include <net/protocol.h>
96#include <net/route.h>
97#include <net/sock.h>
98#include <net/checksum.h>
99#include <linux/netfilter_ipv4.h>
100#ifdef CONFIG_IP_MROUTE
101#include <linux/mroute.h>
102#endif
103#ifdef CONFIG_PROC_FS
104#include <linux/proc_fs.h>
105#include <linux/seq_file.h>
106#endif
107
108#define IP_MAX_MEMBERSHIPS 20
109#define IP_MAX_MSF 10
110
111#ifdef CONFIG_IP_MULTICAST
112/* Parameter names and values are taken from igmp-v2-06 draft */
113
114#define IGMP_V1_Router_Present_Timeout (400*HZ)
115#define IGMP_V2_Router_Present_Timeout (400*HZ)
116#define IGMP_Unsolicited_Report_Interval (10*HZ)
117#define IGMP_Query_Response_Interval (10*HZ)
118#define IGMP_Unsolicited_Report_Count 2
119
120
121#define IGMP_Initial_Report_Delay (1)
122
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.
128 */
129
Herbert Xu42f811b2007-06-04 23:34:44 -0700130#define IGMP_V1_SEEN(in_dev) \
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900131 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \
Herbert Xu42f811b2007-06-04 23:34:44 -0700132 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) \
YOSHIFUJI Hideakic346dca2008-03-25 21:47:49 +0900136 (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \
Herbert Xu42f811b2007-06-04 23:34:44 -0700137 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)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im);
Al Viro63007722006-09-27 18:31:32 -0700142static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143static void igmpv3_clear_delrec(struct in_device *in_dev);
144static int sf_setstate(struct ip_mc_list *pmc);
145static void sf_markstate(struct ip_mc_list *pmc);
146#endif
147static void ip_mc_clear_src(struct ip_mc_list *pmc);
Al Viro8f935bb2006-09-27 18:30:07 -0700148static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
149 int sfcount, __be32 *psfsrc, int delta);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151static void ip_ma_put(struct ip_mc_list *im)
152{
153 if (atomic_dec_and_test(&im->refcnt)) {
154 in_dev_put(im->interface);
Lai Jiangshan42ea299d2011-03-18 11:44:08 +0800155 kfree_rcu(im, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 }
157}
158
David S. Millerd9aa9382010-11-15 08:52:02 -0800159#define for_each_pmc_rcu(in_dev, pmc) \
160 for (pmc = rcu_dereference(in_dev->mc_list); \
161 pmc != NULL; \
162 pmc = rcu_dereference(pmc->next_rcu))
163
164#define for_each_pmc_rtnl(in_dev, pmc) \
165 for (pmc = rtnl_dereference(in_dev->mc_list); \
166 pmc != NULL; \
167 pmc = rtnl_dereference(pmc->next_rcu))
168
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169#ifdef CONFIG_IP_MULTICAST
170
171/*
172 * Timer management
173 */
174
Eric Dumazet1d7138d2010-11-12 05:46:50 +0000175static void igmp_stop_timer(struct ip_mc_list *im)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176{
177 spin_lock_bh(&im->lock);
178 if (del_timer(&im->timer))
179 atomic_dec(&im->refcnt);
Jianjun Konga7e9ff72008-11-03 00:26:09 -0800180 im->tm_running = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 im->reporter = 0;
182 im->unsolicit_count = 0;
183 spin_unlock_bh(&im->lock);
184}
185
186/* It must be called with locked im->lock */
187static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
188{
Jianjun Konga7e9ff72008-11-03 00:26:09 -0800189 int tv = net_random() % max_delay;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
Jianjun Konga7e9ff72008-11-03 00:26:09 -0800191 im->tm_running = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 if (!mod_timer(&im->timer, jiffies+tv+2))
193 atomic_inc(&im->refcnt);
194}
195
196static void igmp_gq_start_timer(struct in_device *in_dev)
197{
198 int tv = net_random() % in_dev->mr_maxdelay;
199
200 in_dev->mr_gq_running = 1;
201 if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2))
202 in_dev_hold(in_dev);
203}
204
205static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
206{
207 int tv = net_random() % delay;
208
209 if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
210 in_dev_hold(in_dev);
211}
212
213static void igmp_mod_timer(struct ip_mc_list *im, int max_delay)
214{
215 spin_lock_bh(&im->lock);
216 im->unsolicit_count = 0;
217 if (del_timer(&im->timer)) {
218 if ((long)(im->timer.expires-jiffies) < max_delay) {
219 add_timer(&im->timer);
Jianjun Konga7e9ff72008-11-03 00:26:09 -0800220 im->tm_running = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 spin_unlock_bh(&im->lock);
222 return;
223 }
224 atomic_dec(&im->refcnt);
225 }
226 igmp_start_timer(im, max_delay);
227 spin_unlock_bh(&im->lock);
228}
229
230
231/*
232 * Send an IGMP report.
233 */
234
235#define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4)
236
237
238static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type,
239 int gdeleted, int sdeleted)
240{
241 switch (type) {
242 case IGMPV3_MODE_IS_INCLUDE:
243 case IGMPV3_MODE_IS_EXCLUDE:
244 if (gdeleted || sdeleted)
245 return 0;
David L Stevensad125832006-01-18 14:20:56 -0800246 if (!(pmc->gsquery && !psf->sf_gsresp)) {
247 if (pmc->sfmode == MCAST_INCLUDE)
248 return 1;
249 /* don't include if this source is excluded
250 * in all filters
251 */
252 if (psf->sf_count[MCAST_INCLUDE])
253 return type == IGMPV3_MODE_IS_INCLUDE;
254 return pmc->sfcount[MCAST_EXCLUDE] ==
255 psf->sf_count[MCAST_EXCLUDE];
256 }
257 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 case IGMPV3_CHANGE_TO_INCLUDE:
259 if (gdeleted || sdeleted)
260 return 0;
261 return psf->sf_count[MCAST_INCLUDE] != 0;
262 case IGMPV3_CHANGE_TO_EXCLUDE:
263 if (gdeleted || sdeleted)
264 return 0;
265 if (pmc->sfcount[MCAST_EXCLUDE] == 0 ||
266 psf->sf_count[MCAST_INCLUDE])
267 return 0;
268 return pmc->sfcount[MCAST_EXCLUDE] ==
269 psf->sf_count[MCAST_EXCLUDE];
270 case IGMPV3_ALLOW_NEW_SOURCES:
271 if (gdeleted || !psf->sf_crcount)
272 return 0;
273 return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted;
274 case IGMPV3_BLOCK_OLD_SOURCES:
275 if (pmc->sfmode == MCAST_INCLUDE)
276 return gdeleted || (psf->sf_crcount && sdeleted);
277 return psf->sf_crcount && !gdeleted && !sdeleted;
278 }
279 return 0;
280}
281
282static int
283igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted)
284{
285 struct ip_sf_list *psf;
286 int scount = 0;
287
288 for (psf=pmc->sources; psf; psf=psf->sf_next) {
289 if (!is_in(pmc, psf, type, gdeleted, sdeleted))
290 continue;
291 scount++;
292 }
293 return scount;
294}
295
Eric Dumazet57e1ab62010-11-16 20:36:42 +0000296#define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb))
297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
299{
300 struct sk_buff *skb;
301 struct rtable *rt;
302 struct iphdr *pip;
303 struct igmpv3_report *pig;
Daniel Lezcano877aced2008-08-13 16:15:57 -0700304 struct net *net = dev_net(dev);
David S. Miller31e45432011-05-03 20:25:42 -0700305 struct flowi4 fl4;
Herbert Xu66088242011-11-18 02:20:04 +0000306 int hlen = LL_RESERVED_SPACE(dev);
307 int tlen = dev->needed_tailroom;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Eric Dumazet57e1ab62010-11-16 20:36:42 +0000309 while (1) {
Herbert Xu66088242011-11-18 02:20:04 +0000310 skb = alloc_skb(size + hlen + tlen,
Eric Dumazet57e1ab62010-11-16 20:36:42 +0000311 GFP_ATOMIC | __GFP_NOWARN);
312 if (skb)
313 break;
314 size >>= 1;
315 if (size < 256)
316 return NULL;
317 }
318 igmp_skb_size(skb) = size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319
David S. Miller31e45432011-05-03 20:25:42 -0700320 rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0,
David S. Miller78fbfd82011-03-12 00:00:52 -0500321 0, 0,
322 IPPROTO_IGMP, 0, dev->ifindex);
323 if (IS_ERR(rt)) {
324 kfree_skb(skb);
325 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
Changli Gaod8d1f302010-06-10 23:31:35 -0700328 skb_dst_set(skb, &rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 skb->dev = dev;
330
Herbert Xu66088242011-11-18 02:20:04 +0000331 skb_reserve(skb, hlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332
Arnaldo Carvalho de Melo7e28ecc2007-03-10 18:40:59 -0300333 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700334 pip = ip_hdr(skb);
Arnaldo Carvalho de Melo7e28ecc2007-03-10 18:40:59 -0300335 skb_put(skb, sizeof(struct iphdr) + 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337 pip->version = 4;
338 pip->ihl = (sizeof(struct iphdr)+4)>>2;
339 pip->tos = 0xc0;
340 pip->frag_off = htons(IP_DF);
341 pip->ttl = 1;
David S. Miller492f64c2011-05-03 20:53:12 -0700342 pip->daddr = fl4.daddr;
343 pip->saddr = fl4.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 pip->protocol = IPPROTO_IGMP;
345 pip->tot_len = 0; /* filled in later */
Changli Gaod8d1f302010-06-10 23:31:35 -0700346 ip_select_ident(pip, &rt->dst, NULL);
Daniel Baluta5e73ea12012-04-15 01:34:41 +0000347 ((u8 *)&pip[1])[0] = IPOPT_RA;
348 ((u8 *)&pip[1])[1] = 4;
349 ((u8 *)&pip[1])[2] = 0;
350 ((u8 *)&pip[1])[3] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
Arnaldo Carvalho de Melob0e380b2007-04-10 21:21:55 -0700352 skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4;
Arnaldo Carvalho de Melod10ba342007-03-14 21:05:37 -0300353 skb_put(skb, sizeof(*pig));
Arnaldo Carvalho de Melod9edf9e2007-03-13 14:19:23 -0300354 pig = igmpv3_report_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT;
356 pig->resv1 = 0;
357 pig->csum = 0;
358 pig->resv2 = 0;
359 pig->ngrec = 0;
360 return skb;
361}
362
363static int igmpv3_sendpack(struct sk_buff *skb)
364{
Arnaldo Carvalho de Melod9edf9e2007-03-13 14:19:23 -0300365 struct igmphdr *pig = igmp_hdr(skb);
Arnaldo Carvalho de Melo27a884d2007-04-19 20:29:13 -0700366 const int igmplen = skb->tail - skb->transport_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367
Arnaldo Carvalho de Melod9edf9e2007-03-13 14:19:23 -0300368 pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369
Herbert Xuc439cb22008-01-11 19:14:00 -0800370 return ip_local_out(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371}
372
373static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
374{
Jianjun Konga7e9ff72008-11-03 00:26:09 -0800375 return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376}
377
378static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc,
379 int type, struct igmpv3_grec **ppgr)
380{
381 struct net_device *dev = pmc->interface->dev;
382 struct igmpv3_report *pih;
383 struct igmpv3_grec *pgr;
384
385 if (!skb)
386 skb = igmpv3_newpack(dev, dev->mtu);
387 if (!skb)
388 return NULL;
389 pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec));
390 pgr->grec_type = type;
391 pgr->grec_auxwords = 0;
392 pgr->grec_nsrcs = 0;
393 pgr->grec_mca = pmc->multiaddr;
Arnaldo Carvalho de Melod9edf9e2007-03-13 14:19:23 -0300394 pih = igmpv3_report_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 pih->ngrec = htons(ntohs(pih->ngrec)+1);
396 *ppgr = pgr;
397 return skb;
398}
399
Eric Dumazet57e1ab62010-11-16 20:36:42 +0000400#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 skb_tailroom(skb)) : 0)
402
403static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
404 int type, int gdeleted, int sdeleted)
405{
406 struct net_device *dev = pmc->interface->dev;
407 struct igmpv3_report *pih;
408 struct igmpv3_grec *pgr = NULL;
409 struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
David L Stevensad125832006-01-18 14:20:56 -0800410 int scount, stotal, first, isquery, truncate;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
412 if (pmc->multiaddr == IGMP_ALL_HOSTS)
413 return skb;
414
415 isquery = type == IGMPV3_MODE_IS_INCLUDE ||
416 type == IGMPV3_MODE_IS_EXCLUDE;
417 truncate = type == IGMPV3_MODE_IS_EXCLUDE ||
418 type == IGMPV3_CHANGE_TO_EXCLUDE;
419
David L Stevensad125832006-01-18 14:20:56 -0800420 stotal = scount = 0;
421
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 psf_list = sdeleted ? &pmc->tomb : &pmc->sources;
423
David L Stevensad125832006-01-18 14:20:56 -0800424 if (!*psf_list)
425 goto empty_source;
426
Arnaldo Carvalho de Melod9edf9e2007-03-13 14:19:23 -0300427 pih = skb ? igmpv3_report_hdr(skb) : NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428
429 /* EX and TO_EX get a fresh packet, if needed */
430 if (truncate) {
431 if (pih && pih->ngrec &&
432 AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
433 if (skb)
434 igmpv3_sendpack(skb);
435 skb = igmpv3_newpack(dev, dev->mtu);
436 }
437 }
438 first = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 psf_prev = NULL;
440 for (psf=*psf_list; psf; psf=psf_next) {
Al Viroea4d9e72006-09-27 18:30:52 -0700441 __be32 *psrc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442
443 psf_next = psf->sf_next;
444
445 if (!is_in(pmc, psf, type, gdeleted, sdeleted)) {
446 psf_prev = psf;
447 continue;
448 }
449
450 /* clear marks on query responses */
451 if (isquery)
452 psf->sf_gsresp = 0;
453
Al Viro63007722006-09-27 18:31:32 -0700454 if (AVAILABLE(skb) < sizeof(__be32) +
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 first*sizeof(struct igmpv3_grec)) {
456 if (truncate && !first)
457 break; /* truncate these */
458 if (pgr)
459 pgr->grec_nsrcs = htons(scount);
460 if (skb)
461 igmpv3_sendpack(skb);
462 skb = igmpv3_newpack(dev, dev->mtu);
463 first = 1;
464 scount = 0;
465 }
466 if (first) {
467 skb = add_grhead(skb, pmc, type, &pgr);
468 first = 0;
469 }
Alexey Dobriyancc63f702007-02-06 14:35:25 -0800470 if (!skb)
471 return NULL;
Al Viro63007722006-09-27 18:31:32 -0700472 psrc = (__be32 *)skb_put(skb, sizeof(__be32));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 *psrc = psf->sf_inaddr;
David L Stevensad125832006-01-18 14:20:56 -0800474 scount++; stotal++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 if ((type == IGMPV3_ALLOW_NEW_SOURCES ||
476 type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
477 psf->sf_crcount--;
478 if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
479 if (psf_prev)
480 psf_prev->sf_next = psf->sf_next;
481 else
482 *psf_list = psf->sf_next;
483 kfree(psf);
484 continue;
485 }
486 }
487 psf_prev = psf;
488 }
David L Stevensad125832006-01-18 14:20:56 -0800489
490empty_source:
491 if (!stotal) {
492 if (type == IGMPV3_ALLOW_NEW_SOURCES ||
493 type == IGMPV3_BLOCK_OLD_SOURCES)
494 return skb;
495 if (pmc->crcount || isquery) {
496 /* make sure we have room for group header */
497 if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) {
498 igmpv3_sendpack(skb);
499 skb = NULL; /* add_grhead will get a new one */
500 }
501 skb = add_grhead(skb, pmc, type, &pgr);
502 }
503 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 if (pgr)
505 pgr->grec_nsrcs = htons(scount);
506
507 if (isquery)
508 pmc->gsquery = 0; /* clear query state on report */
509 return skb;
510}
511
512static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
513{
514 struct sk_buff *skb = NULL;
515 int type;
516
517 if (!pmc) {
Eric Dumazet1d7138d2010-11-12 05:46:50 +0000518 rcu_read_lock();
519 for_each_pmc_rcu(in_dev, pmc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (pmc->multiaddr == IGMP_ALL_HOSTS)
521 continue;
522 spin_lock_bh(&pmc->lock);
523 if (pmc->sfcount[MCAST_EXCLUDE])
524 type = IGMPV3_MODE_IS_EXCLUDE;
525 else
526 type = IGMPV3_MODE_IS_INCLUDE;
527 skb = add_grec(skb, pmc, type, 0, 0);
528 spin_unlock_bh(&pmc->lock);
529 }
Eric Dumazet1d7138d2010-11-12 05:46:50 +0000530 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 } else {
532 spin_lock_bh(&pmc->lock);
533 if (pmc->sfcount[MCAST_EXCLUDE])
534 type = IGMPV3_MODE_IS_EXCLUDE;
535 else
536 type = IGMPV3_MODE_IS_INCLUDE;
537 skb = add_grec(skb, pmc, type, 0, 0);
538 spin_unlock_bh(&pmc->lock);
539 }
540 if (!skb)
541 return 0;
542 return igmpv3_sendpack(skb);
543}
544
545/*
546 * remove zero-count source records from a source filter list
547 */
548static void igmpv3_clear_zeros(struct ip_sf_list **ppsf)
549{
550 struct ip_sf_list *psf_prev, *psf_next, *psf;
551
552 psf_prev = NULL;
553 for (psf=*ppsf; psf; psf = psf_next) {
554 psf_next = psf->sf_next;
555 if (psf->sf_crcount == 0) {
556 if (psf_prev)
557 psf_prev->sf_next = psf->sf_next;
558 else
559 *ppsf = psf->sf_next;
560 kfree(psf);
561 } else
562 psf_prev = psf;
563 }
564}
565
566static void igmpv3_send_cr(struct in_device *in_dev)
567{
568 struct ip_mc_list *pmc, *pmc_prev, *pmc_next;
569 struct sk_buff *skb = NULL;
570 int type, dtype;
571
Eric Dumazet1d7138d2010-11-12 05:46:50 +0000572 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 spin_lock_bh(&in_dev->mc_tomb_lock);
574
575 /* deleted MCA's */
576 pmc_prev = NULL;
577 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) {
578 pmc_next = pmc->next;
579 if (pmc->sfmode == MCAST_INCLUDE) {
580 type = IGMPV3_BLOCK_OLD_SOURCES;
581 dtype = IGMPV3_BLOCK_OLD_SOURCES;
582 skb = add_grec(skb, pmc, type, 1, 0);
583 skb = add_grec(skb, pmc, dtype, 1, 1);
584 }
585 if (pmc->crcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 if (pmc->sfmode == MCAST_EXCLUDE) {
587 type = IGMPV3_CHANGE_TO_INCLUDE;
588 skb = add_grec(skb, pmc, type, 1, 0);
589 }
David L Stevensad125832006-01-18 14:20:56 -0800590 pmc->crcount--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 if (pmc->crcount == 0) {
592 igmpv3_clear_zeros(&pmc->tomb);
593 igmpv3_clear_zeros(&pmc->sources);
594 }
595 }
596 if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) {
597 if (pmc_prev)
598 pmc_prev->next = pmc_next;
599 else
600 in_dev->mc_tomb = pmc_next;
601 in_dev_put(pmc->interface);
602 kfree(pmc);
603 } else
604 pmc_prev = pmc;
605 }
606 spin_unlock_bh(&in_dev->mc_tomb_lock);
607
608 /* change recs */
Eric Dumazet1d7138d2010-11-12 05:46:50 +0000609 for_each_pmc_rcu(in_dev, pmc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 spin_lock_bh(&pmc->lock);
611 if (pmc->sfcount[MCAST_EXCLUDE]) {
612 type = IGMPV3_BLOCK_OLD_SOURCES;
613 dtype = IGMPV3_ALLOW_NEW_SOURCES;
614 } else {
615 type = IGMPV3_ALLOW_NEW_SOURCES;
616 dtype = IGMPV3_BLOCK_OLD_SOURCES;
617 }
618 skb = add_grec(skb, pmc, type, 0, 0);
619 skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */
620
621 /* filter mode changes */
622 if (pmc->crcount) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 if (pmc->sfmode == MCAST_EXCLUDE)
624 type = IGMPV3_CHANGE_TO_EXCLUDE;
625 else
626 type = IGMPV3_CHANGE_TO_INCLUDE;
627 skb = add_grec(skb, pmc, type, 0, 0);
David L Stevensad125832006-01-18 14:20:56 -0800628 pmc->crcount--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 }
630 spin_unlock_bh(&pmc->lock);
631 }
Eric Dumazet1d7138d2010-11-12 05:46:50 +0000632 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633
634 if (!skb)
635 return;
636 (void) igmpv3_sendpack(skb);
637}
638
639static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
640 int type)
641{
642 struct sk_buff *skb;
643 struct iphdr *iph;
644 struct igmphdr *ih;
645 struct rtable *rt;
646 struct net_device *dev = in_dev->dev;
Daniel Lezcano877aced2008-08-13 16:15:57 -0700647 struct net *net = dev_net(dev);
Al Viro63007722006-09-27 18:31:32 -0700648 __be32 group = pmc ? pmc->multiaddr : 0;
David S. Miller31e45432011-05-03 20:25:42 -0700649 struct flowi4 fl4;
Al Viro63007722006-09-27 18:31:32 -0700650 __be32 dst;
Herbert Xu66088242011-11-18 02:20:04 +0000651 int hlen, tlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
653 if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
654 return igmpv3_send_report(in_dev, pmc);
655 else if (type == IGMP_HOST_LEAVE_MESSAGE)
656 dst = IGMP_ALL_ROUTER;
657 else
658 dst = group;
659
David S. Miller31e45432011-05-03 20:25:42 -0700660 rt = ip_route_output_ports(net, &fl4, NULL, dst, 0,
David S. Miller78fbfd82011-03-12 00:00:52 -0500661 0, 0,
662 IPPROTO_IGMP, 0, dev->ifindex);
663 if (IS_ERR(rt))
664 return -1;
665
Herbert Xu66088242011-11-18 02:20:04 +0000666 hlen = LL_RESERVED_SPACE(dev);
667 tlen = dev->needed_tailroom;
668 skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 if (skb == NULL) {
670 ip_rt_put(rt);
671 return -1;
672 }
673
Changli Gaod8d1f302010-06-10 23:31:35 -0700674 skb_dst_set(skb, &rt->dst);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675
Herbert Xu66088242011-11-18 02:20:04 +0000676 skb_reserve(skb, hlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677
Arnaldo Carvalho de Melo7e28ecc2007-03-10 18:40:59 -0300678 skb_reset_network_header(skb);
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700679 iph = ip_hdr(skb);
Arnaldo Carvalho de Melo7e28ecc2007-03-10 18:40:59 -0300680 skb_put(skb, sizeof(struct iphdr) + 4);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
682 iph->version = 4;
683 iph->ihl = (sizeof(struct iphdr)+4)>>2;
684 iph->tos = 0xc0;
685 iph->frag_off = htons(IP_DF);
686 iph->ttl = 1;
687 iph->daddr = dst;
David S. Miller492f64c2011-05-03 20:53:12 -0700688 iph->saddr = fl4.saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689 iph->protocol = IPPROTO_IGMP;
Changli Gaod8d1f302010-06-10 23:31:35 -0700690 ip_select_ident(iph, &rt->dst, NULL);
Daniel Baluta5e73ea12012-04-15 01:34:41 +0000691 ((u8 *)&iph[1])[0] = IPOPT_RA;
692 ((u8 *)&iph[1])[1] = 4;
693 ((u8 *)&iph[1])[2] = 0;
694 ((u8 *)&iph[1])[3] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695
696 ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
Jianjun Konga7e9ff72008-11-03 00:26:09 -0800697 ih->type = type;
698 ih->code = 0;
699 ih->csum = 0;
700 ih->group = group;
701 ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
Herbert Xuc439cb22008-01-11 19:14:00 -0800703 return ip_local_out(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704}
705
706static void igmp_gq_timer_expire(unsigned long data)
707{
708 struct in_device *in_dev = (struct in_device *)data;
709
710 in_dev->mr_gq_running = 0;
711 igmpv3_send_report(in_dev, NULL);
712 __in_dev_put(in_dev);
713}
714
715static void igmp_ifc_timer_expire(unsigned long data)
716{
717 struct in_device *in_dev = (struct in_device *)data;
718
719 igmpv3_send_cr(in_dev);
720 if (in_dev->mr_ifc_count) {
721 in_dev->mr_ifc_count--;
722 igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval);
723 }
724 __in_dev_put(in_dev);
725}
726
727static void igmp_ifc_event(struct in_device *in_dev)
728{
729 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev))
730 return;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900731 in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv :
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 IGMP_Unsolicited_Report_Count;
733 igmp_ifc_start_timer(in_dev, 1);
734}
735
736
737static void igmp_timer_expire(unsigned long data)
738{
739 struct ip_mc_list *im=(struct ip_mc_list *)data;
740 struct in_device *in_dev = im->interface;
741
742 spin_lock(&im->lock);
Jianjun Konga7e9ff72008-11-03 00:26:09 -0800743 im->tm_running = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744
745 if (im->unsolicit_count) {
746 im->unsolicit_count--;
747 igmp_start_timer(im, IGMP_Unsolicited_Report_Interval);
748 }
749 im->reporter = 1;
750 spin_unlock(&im->lock);
751
752 if (IGMP_V1_SEEN(in_dev))
753 igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT);
754 else if (IGMP_V2_SEEN(in_dev))
755 igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT);
756 else
757 igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT);
758
759 ip_ma_put(im);
760}
761
David L Stevensad125832006-01-18 14:20:56 -0800762/* mark EXCLUDE-mode sources */
Al Viroea4d9e72006-09-27 18:30:52 -0700763static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764{
765 struct ip_sf_list *psf;
766 int i, scount;
767
768 scount = 0;
769 for (psf=pmc->sources; psf; psf=psf->sf_next) {
770 if (scount == nsrcs)
771 break;
David L Stevensad125832006-01-18 14:20:56 -0800772 for (i=0; i<nsrcs; i++) {
773 /* skip inactive filters */
Yan, Zhenge05c4ad32011-08-23 22:54:37 +0000774 if (psf->sf_count[MCAST_INCLUDE] ||
David L Stevensad125832006-01-18 14:20:56 -0800775 pmc->sfcount[MCAST_EXCLUDE] !=
776 psf->sf_count[MCAST_EXCLUDE])
RongQing.Lice713ee2012-04-05 17:36:29 +0800777 break;
David L Stevensad125832006-01-18 14:20:56 -0800778 if (srcs[i] == psf->sf_inaddr) {
779 scount++;
780 break;
781 }
782 }
783 }
784 pmc->gsquery = 0;
785 if (scount == nsrcs) /* all sources excluded */
786 return 0;
787 return 1;
788}
789
Al Viroea4d9e72006-09-27 18:30:52 -0700790static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs)
David L Stevensad125832006-01-18 14:20:56 -0800791{
792 struct ip_sf_list *psf;
793 int i, scount;
794
795 if (pmc->sfmode == MCAST_EXCLUDE)
796 return igmp_xmarksources(pmc, nsrcs, srcs);
797
798 /* mark INCLUDE-mode sources */
799 scount = 0;
800 for (psf=pmc->sources; psf; psf=psf->sf_next) {
801 if (scount == nsrcs)
802 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 for (i=0; i<nsrcs; i++)
804 if (srcs[i] == psf->sf_inaddr) {
805 psf->sf_gsresp = 1;
806 scount++;
807 break;
808 }
809 }
David L Stevensad125832006-01-18 14:20:56 -0800810 if (!scount) {
811 pmc->gsquery = 0;
812 return 0;
813 }
814 pmc->gsquery = 1;
815 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816}
817
Eric Dumazetd679c532012-09-06 20:37:06 +0000818/* return true if packet was dropped */
819static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820{
821 struct ip_mc_list *im;
822
823 /* Timers are only set for non-local groups */
824
825 if (group == IGMP_ALL_HOSTS)
Eric Dumazetd679c532012-09-06 20:37:06 +0000826 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827
Eric Dumazet1d7138d2010-11-12 05:46:50 +0000828 rcu_read_lock();
829 for_each_pmc_rcu(in_dev, im) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 if (im->multiaddr == group) {
831 igmp_stop_timer(im);
832 break;
833 }
834 }
Eric Dumazet1d7138d2010-11-12 05:46:50 +0000835 rcu_read_unlock();
Eric Dumazetd679c532012-09-06 20:37:06 +0000836 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837}
838
Eric Dumazetd679c532012-09-06 20:37:06 +0000839/* return true if packet was dropped */
840static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 int len)
842{
Arnaldo Carvalho de Melod9edf9e2007-03-13 14:19:23 -0300843 struct igmphdr *ih = igmp_hdr(skb);
844 struct igmpv3_query *ih3 = igmpv3_query_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 struct ip_mc_list *im;
Al Viro63007722006-09-27 18:31:32 -0700846 __be32 group = ih->group;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 int max_delay;
848 int mark = 0;
849
850
David Stevens5b7c8402010-09-30 14:29:40 +0000851 if (len == 8) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 if (ih->code == 0) {
853 /* Alas, old v1 router presents here. */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900854
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 max_delay = IGMP_Query_Response_Interval;
856 in_dev->mr_v1_seen = jiffies +
857 IGMP_V1_Router_Present_Timeout;
858 group = 0;
859 } else {
860 /* v2 router present */
861 max_delay = ih->code*(HZ/IGMP_TIMER_SCALE);
862 in_dev->mr_v2_seen = jiffies +
863 IGMP_V2_Router_Present_Timeout;
864 }
865 /* cancel the interface change timer */
866 in_dev->mr_ifc_count = 0;
867 if (del_timer(&in_dev->mr_ifc_timer))
868 __in_dev_put(in_dev);
869 /* clear deleted report items */
870 igmpv3_clear_delrec(in_dev);
871 } else if (len < 12) {
Eric Dumazetd679c532012-09-06 20:37:06 +0000872 return true; /* ignore bogus packet; freed by caller */
David Stevens5b7c8402010-09-30 14:29:40 +0000873 } else if (IGMP_V1_SEEN(in_dev)) {
874 /* This is a v3 query with v1 queriers present */
875 max_delay = IGMP_Query_Response_Interval;
876 group = 0;
877 } else if (IGMP_V2_SEEN(in_dev)) {
878 /* this is a v3 query with v2 queriers present;
879 * Interpretation of the max_delay code is problematic here.
880 * A real v2 host would use ih_code directly, while v3 has a
881 * different encoding. We use the v3 encoding as more likely
882 * to be intended in a v3 query.
883 */
884 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
Ben Hutchingsa8c1f652012-01-09 14:06:46 -0800885 if (!max_delay)
886 max_delay = 1; /* can't mod w/ 0 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 } else { /* v3 */
888 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)))
Eric Dumazetd679c532012-09-06 20:37:06 +0000889 return true;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900890
Arnaldo Carvalho de Melod9edf9e2007-03-13 14:19:23 -0300891 ih3 = igmpv3_query_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 if (ih3->nsrcs) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900893 if (!pskb_may_pull(skb, sizeof(struct igmpv3_query)
Al Viro63007722006-09-27 18:31:32 -0700894 + ntohs(ih3->nsrcs)*sizeof(__be32)))
Eric Dumazetd679c532012-09-06 20:37:06 +0000895 return true;
Arnaldo Carvalho de Melod9edf9e2007-03-13 14:19:23 -0300896 ih3 = igmpv3_query_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897 }
898
899 max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE);
900 if (!max_delay)
901 max_delay = 1; /* can't mod w/ 0 */
902 in_dev->mr_maxdelay = max_delay;
903 if (ih3->qrv)
904 in_dev->mr_qrv = ih3->qrv;
905 if (!group) { /* general query */
906 if (ih3->nsrcs)
Eric Dumazetd679c532012-09-06 20:37:06 +0000907 return false; /* no sources allowed */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700908 igmp_gq_start_timer(in_dev);
Eric Dumazetd679c532012-09-06 20:37:06 +0000909 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700910 }
911 /* mark sources to include, if group & source-specific */
912 mark = ih3->nsrcs != 0;
913 }
914
915 /*
916 * - Start the timers in all of our membership records
917 * that the query applies to for the interface on
918 * which the query arrived excl. those that belong
919 * to a "local" group (224.0.0.X)
920 * - For timers already running check if they need to
921 * be reset.
922 * - Use the igmp->igmp_code field as the maximum
923 * delay possible
924 */
Eric Dumazet1d7138d2010-11-12 05:46:50 +0000925 rcu_read_lock();
926 for_each_pmc_rcu(in_dev, im) {
David L Stevensad125832006-01-18 14:20:56 -0800927 int changed;
928
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 if (group && group != im->multiaddr)
930 continue;
931 if (im->multiaddr == IGMP_ALL_HOSTS)
932 continue;
933 spin_lock_bh(&im->lock);
934 if (im->tm_running)
935 im->gsquery = im->gsquery && mark;
936 else
937 im->gsquery = mark;
David L Stevensad125832006-01-18 14:20:56 -0800938 changed = !im->gsquery ||
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900939 igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 spin_unlock_bh(&im->lock);
David L Stevensad125832006-01-18 14:20:56 -0800941 if (changed)
942 igmp_mod_timer(im, max_delay);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700943 }
Eric Dumazet1d7138d2010-11-12 05:46:50 +0000944 rcu_read_unlock();
Eric Dumazetd679c532012-09-06 20:37:06 +0000945 return false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946}
947
Eric Dumazet9a57a9d2010-06-07 03:17:10 +0000948/* called in rcu_read_lock() section */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949int igmp_rcv(struct sk_buff *skb)
950{
951 /* This basically follows the spec line by line -- see RFC1112 */
952 struct igmphdr *ih;
Eric Dumazet9a57a9d2010-06-07 03:17:10 +0000953 struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 int len = skb->len;
Eric Dumazetd679c532012-09-06 20:37:06 +0000955 bool dropped = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
Denis V. Lunevcd557bc2008-02-09 23:22:26 -0800957 if (in_dev == NULL)
958 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959
Herbert Xufb286bb2005-11-10 13:01:24 -0800960 if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
Eric Dumazet9a57a9d2010-06-07 03:17:10 +0000961 goto drop;
Herbert Xufb286bb2005-11-10 13:01:24 -0800962
963 switch (skb->ip_summed) {
Patrick McHardy84fa7932006-08-29 16:44:56 -0700964 case CHECKSUM_COMPLETE:
Al Virod3bc23e2006-11-14 21:24:49 -0800965 if (!csum_fold(skb->csum))
Herbert Xufb286bb2005-11-10 13:01:24 -0800966 break;
967 /* fall through */
968 case CHECKSUM_NONE:
969 skb->csum = 0;
970 if (__skb_checksum_complete(skb))
Eric Dumazet9a57a9d2010-06-07 03:17:10 +0000971 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 }
973
Arnaldo Carvalho de Melod9edf9e2007-03-13 14:19:23 -0300974 ih = igmp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 switch (ih->type) {
976 case IGMP_HOST_MEMBERSHIP_QUERY:
Eric Dumazetd679c532012-09-06 20:37:06 +0000977 dropped = igmp_heard_query(in_dev, skb, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 break;
979 case IGMP_HOST_MEMBERSHIP_REPORT:
980 case IGMPV2_HOST_MEMBERSHIP_REPORT:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981 /* Is it our report looped back? */
David S. Millerc7537962010-11-11 17:07:48 -0800982 if (rt_is_output_route(skb_rtable(skb)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 break;
David Stevens24c69272005-12-02 20:32:59 -0800984 /* don't rely on MC router hearing unicast reports */
985 if (skb->pkt_type == PACKET_MULTICAST ||
986 skb->pkt_type == PACKET_BROADCAST)
Eric Dumazetd679c532012-09-06 20:37:06 +0000987 dropped = igmp_heard_report(in_dev, ih->group);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 break;
989 case IGMP_PIM:
990#ifdef CONFIG_IP_PIMSM_V1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 return pim_rcv_v1(skb);
992#endif
Herbert Xuc6b471e2010-02-07 17:26:30 +0000993 case IGMPV3_HOST_MEMBERSHIP_REPORT:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700994 case IGMP_DVMRP:
995 case IGMP_TRACE:
996 case IGMP_HOST_LEAVE_MESSAGE:
997 case IGMP_MTRACE:
998 case IGMP_MTRACE_RESP:
999 break;
1000 default:
Linus Torvaldsdd1c1852006-01-31 13:11:41 -08001001 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 }
Herbert Xufb286bb2005-11-10 13:01:24 -08001003
Denis V. Lunevcd557bc2008-02-09 23:22:26 -08001004drop:
Eric Dumazetd679c532012-09-06 20:37:06 +00001005 if (dropped)
1006 kfree_skb(skb);
1007 else
1008 consume_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 return 0;
1010}
1011
1012#endif
1013
1014
1015/*
1016 * Add a filter to a device
1017 */
1018
Al Viro63007722006-09-27 18:31:32 -07001019static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020{
1021 char buf[MAX_ADDR_LEN];
1022 struct net_device *dev = in_dev->dev;
1023
1024 /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG.
1025 We will get multicast token leakage, when IFF_MULTICAST
Jiri Pirkob81693d2011-08-16 06:29:02 +00001026 is changed. This check should be done in ndo_set_rx_mode
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 routine. Something sort of:
1028 if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; }
1029 --ANK
1030 */
1031 if (arp_mc_map(addr, buf, dev, 0) == 0)
Jiri Pirko22bedad32010-04-01 21:22:57 +00001032 dev_mc_add(dev, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033}
1034
1035/*
1036 * Remove a filter from a device
1037 */
1038
Al Viro63007722006-09-27 18:31:32 -07001039static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040{
1041 char buf[MAX_ADDR_LEN];
1042 struct net_device *dev = in_dev->dev;
1043
1044 if (arp_mc_map(addr, buf, dev, 0) == 0)
Jiri Pirko22bedad32010-04-01 21:22:57 +00001045 dev_mc_del(dev, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046}
1047
1048#ifdef CONFIG_IP_MULTICAST
1049/*
1050 * deleted ip_mc_list manipulation
1051 */
1052static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im)
1053{
1054 struct ip_mc_list *pmc;
1055
1056 /* this is an "ip_mc_list" for convenience; only the fields below
1057 * are actually used. In particular, the refcnt and users are not
1058 * used for management of the delete list. Using the same structure
1059 * for deleted items allows change reports to use common code with
1060 * non-deleted or query-response MCA's.
1061 */
Panagiotis Issaris0da974f2006-07-21 14:51:30 -07001062 pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 if (!pmc)
1064 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 spin_lock_bh(&im->lock);
1066 pmc->interface = im->interface;
1067 in_dev_hold(in_dev);
1068 pmc->multiaddr = im->multiaddr;
1069 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1070 IGMP_Unsolicited_Report_Count;
1071 pmc->sfmode = im->sfmode;
1072 if (pmc->sfmode == MCAST_INCLUDE) {
1073 struct ip_sf_list *psf;
1074
1075 pmc->tomb = im->tomb;
1076 pmc->sources = im->sources;
1077 im->tomb = im->sources = NULL;
1078 for (psf=pmc->sources; psf; psf=psf->sf_next)
1079 psf->sf_crcount = pmc->crcount;
1080 }
1081 spin_unlock_bh(&im->lock);
1082
1083 spin_lock_bh(&in_dev->mc_tomb_lock);
1084 pmc->next = in_dev->mc_tomb;
1085 in_dev->mc_tomb = pmc;
1086 spin_unlock_bh(&in_dev->mc_tomb_lock);
1087}
1088
Al Viro63007722006-09-27 18:31:32 -07001089static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001090{
1091 struct ip_mc_list *pmc, *pmc_prev;
1092 struct ip_sf_list *psf, *psf_next;
1093
1094 spin_lock_bh(&in_dev->mc_tomb_lock);
1095 pmc_prev = NULL;
1096 for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) {
1097 if (pmc->multiaddr == multiaddr)
1098 break;
1099 pmc_prev = pmc;
1100 }
1101 if (pmc) {
1102 if (pmc_prev)
1103 pmc_prev->next = pmc->next;
1104 else
1105 in_dev->mc_tomb = pmc->next;
1106 }
1107 spin_unlock_bh(&in_dev->mc_tomb_lock);
1108 if (pmc) {
1109 for (psf=pmc->tomb; psf; psf=psf_next) {
1110 psf_next = psf->sf_next;
1111 kfree(psf);
1112 }
1113 in_dev_put(pmc->interface);
1114 kfree(pmc);
1115 }
1116}
1117
1118static void igmpv3_clear_delrec(struct in_device *in_dev)
1119{
1120 struct ip_mc_list *pmc, *nextpmc;
1121
1122 spin_lock_bh(&in_dev->mc_tomb_lock);
1123 pmc = in_dev->mc_tomb;
1124 in_dev->mc_tomb = NULL;
1125 spin_unlock_bh(&in_dev->mc_tomb_lock);
1126
1127 for (; pmc; pmc = nextpmc) {
1128 nextpmc = pmc->next;
1129 ip_mc_clear_src(pmc);
1130 in_dev_put(pmc->interface);
1131 kfree(pmc);
1132 }
1133 /* clear dead sources, too */
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001134 rcu_read_lock();
1135 for_each_pmc_rcu(in_dev, pmc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 struct ip_sf_list *psf, *psf_next;
1137
1138 spin_lock_bh(&pmc->lock);
1139 psf = pmc->tomb;
1140 pmc->tomb = NULL;
1141 spin_unlock_bh(&pmc->lock);
1142 for (; psf; psf=psf_next) {
1143 psf_next = psf->sf_next;
1144 kfree(psf);
1145 }
1146 }
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001147 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148}
1149#endif
1150
1151static void igmp_group_dropped(struct ip_mc_list *im)
1152{
1153 struct in_device *in_dev = im->interface;
1154#ifdef CONFIG_IP_MULTICAST
1155 int reporter;
1156#endif
1157
1158 if (im->loaded) {
1159 im->loaded = 0;
1160 ip_mc_filter_del(in_dev, im->multiaddr);
1161 }
1162
1163#ifdef CONFIG_IP_MULTICAST
1164 if (im->multiaddr == IGMP_ALL_HOSTS)
1165 return;
1166
1167 reporter = im->reporter;
1168 igmp_stop_timer(im);
1169
1170 if (!in_dev->dead) {
1171 if (IGMP_V1_SEEN(in_dev))
Veaceslav Falico24cf3af2011-05-23 23:15:05 +00001172 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173 if (IGMP_V2_SEEN(in_dev)) {
1174 if (reporter)
1175 igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE);
Veaceslav Falico24cf3af2011-05-23 23:15:05 +00001176 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 }
1178 /* IGMPv3 */
1179 igmpv3_add_delrec(in_dev, im);
1180
1181 igmp_ifc_event(in_dev);
1182 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184}
1185
1186static void igmp_group_added(struct ip_mc_list *im)
1187{
1188 struct in_device *in_dev = im->interface;
1189
1190 if (im->loaded == 0) {
1191 im->loaded = 1;
1192 ip_mc_filter_add(in_dev, im->multiaddr);
1193 }
1194
1195#ifdef CONFIG_IP_MULTICAST
1196 if (im->multiaddr == IGMP_ALL_HOSTS)
1197 return;
1198
1199 if (in_dev->dead)
1200 return;
1201 if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) {
1202 spin_lock_bh(&im->lock);
1203 igmp_start_timer(im, IGMP_Initial_Report_Delay);
1204 spin_unlock_bh(&im->lock);
1205 return;
1206 }
1207 /* else, v3 */
1208
1209 im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
1210 IGMP_Unsolicited_Report_Count;
1211 igmp_ifc_event(in_dev);
1212#endif
1213}
1214
1215
1216/*
1217 * Multicast list managers
1218 */
1219
1220
1221/*
1222 * A socket has joined a multicast group on device dev.
1223 */
1224
Al Viro8f935bb2006-09-27 18:30:07 -07001225void ip_mc_inc_group(struct in_device *in_dev, __be32 addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001226{
1227 struct ip_mc_list *im;
1228
1229 ASSERT_RTNL();
1230
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001231 for_each_pmc_rtnl(in_dev, im) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232 if (im->multiaddr == addr) {
1233 im->users++;
1234 ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0);
1235 goto out;
1236 }
1237 }
1238
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001239 im = kzalloc(sizeof(*im), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240 if (!im)
1241 goto out;
1242
Jianjun Konga7e9ff72008-11-03 00:26:09 -08001243 im->users = 1;
1244 im->interface = in_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001245 in_dev_hold(in_dev);
Jianjun Konga7e9ff72008-11-03 00:26:09 -08001246 im->multiaddr = addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 /* initial mode is (EX, empty) */
1248 im->sfmode = MCAST_EXCLUDE;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 im->sfcount[MCAST_EXCLUDE] = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 atomic_set(&im->refcnt, 1);
1251 spin_lock_init(&im->lock);
1252#ifdef CONFIG_IP_MULTICAST
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -08001253 setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 im->unsolicit_count = IGMP_Unsolicited_Report_Count;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255#endif
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001256
1257 im->next_rcu = in_dev->mc_list;
Rami Rosenb8bae412008-10-07 15:34:37 -07001258 in_dev->mc_count++;
Eric Dumazetcf778b02012-01-12 04:41:32 +00001259 rcu_assign_pointer(in_dev->mc_list, im);
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001260
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261#ifdef CONFIG_IP_MULTICAST
1262 igmpv3_del_delrec(in_dev, im->multiaddr);
1263#endif
1264 igmp_group_added(im);
1265 if (!in_dev->dead)
1266 ip_rt_multicast_event(in_dev);
1267out:
1268 return;
1269}
Eric Dumazet4bc2f182010-07-09 21:22:10 +00001270EXPORT_SYMBOL(ip_mc_inc_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271
1272/*
Jay Vosburgha816c7c2007-02-28 17:03:37 -08001273 * Resend IGMP JOIN report; used for bonding.
Eric Dumazet866f3b22010-11-18 09:33:19 -08001274 * Called with rcu_read_lock()
Jay Vosburgha816c7c2007-02-28 17:03:37 -08001275 */
Eric Dumazet866f3b22010-11-18 09:33:19 -08001276void ip_mc_rejoin_groups(struct in_device *in_dev)
Jay Vosburgha816c7c2007-02-28 17:03:37 -08001277{
Geert Uytterhoeven08882662007-03-12 17:02:37 -07001278#ifdef CONFIG_IP_MULTICAST
Eric Dumazet866f3b22010-11-18 09:33:19 -08001279 struct ip_mc_list *im;
1280 int type;
Jay Vosburgha816c7c2007-02-28 17:03:37 -08001281
Eric Dumazet866f3b22010-11-18 09:33:19 -08001282 for_each_pmc_rcu(in_dev, im) {
1283 if (im->multiaddr == IGMP_ALL_HOSTS)
1284 continue;
Jay Vosburgha816c7c2007-02-28 17:03:37 -08001285
Eric Dumazet866f3b22010-11-18 09:33:19 -08001286 /* a failover is happening and switches
1287 * must be notified immediately
1288 */
1289 if (IGMP_V1_SEEN(in_dev))
1290 type = IGMP_HOST_MEMBERSHIP_REPORT;
1291 else if (IGMP_V2_SEEN(in_dev))
1292 type = IGMPV2_HOST_MEMBERSHIP_REPORT;
1293 else
1294 type = IGMPV3_HOST_MEMBERSHIP_REPORT;
1295 igmp_send_report(in_dev, im, type);
1296 }
Jay Vosburgha816c7c2007-02-28 17:03:37 -08001297#endif
1298}
Eric Dumazet866f3b22010-11-18 09:33:19 -08001299EXPORT_SYMBOL(ip_mc_rejoin_groups);
Jay Vosburgha816c7c2007-02-28 17:03:37 -08001300
1301/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302 * A socket has left a multicast group on device dev
1303 */
1304
Al Viro8f935bb2006-09-27 18:30:07 -07001305void ip_mc_dec_group(struct in_device *in_dev, __be32 addr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306{
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001307 struct ip_mc_list *i;
1308 struct ip_mc_list __rcu **ip;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001309
Linus Torvalds1da177e2005-04-16 15:20:36 -07001310 ASSERT_RTNL();
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001311
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001312 for (ip = &in_dev->mc_list;
1313 (i = rtnl_dereference(*ip)) != NULL;
1314 ip = &i->next_rcu) {
Jianjun Konga7e9ff72008-11-03 00:26:09 -08001315 if (i->multiaddr == addr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 if (--i->users == 0) {
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001317 *ip = i->next_rcu;
Rami Rosenb8bae412008-10-07 15:34:37 -07001318 in_dev->mc_count--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001319 igmp_group_dropped(i);
Veaceslav Falico24cf3af2011-05-23 23:15:05 +00001320 ip_mc_clear_src(i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321
1322 if (!in_dev->dead)
1323 ip_rt_multicast_event(in_dev);
1324
1325 ip_ma_put(i);
1326 return;
1327 }
1328 break;
1329 }
1330 }
1331}
Eric Dumazet4bc2f182010-07-09 21:22:10 +00001332EXPORT_SYMBOL(ip_mc_dec_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333
Moni Shoua75c78502009-09-15 02:37:40 -07001334/* Device changing type */
1335
1336void ip_mc_unmap(struct in_device *in_dev)
1337{
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001338 struct ip_mc_list *pmc;
Moni Shoua75c78502009-09-15 02:37:40 -07001339
1340 ASSERT_RTNL();
1341
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001342 for_each_pmc_rtnl(in_dev, pmc)
1343 igmp_group_dropped(pmc);
Moni Shoua75c78502009-09-15 02:37:40 -07001344}
1345
1346void ip_mc_remap(struct in_device *in_dev)
1347{
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001348 struct ip_mc_list *pmc;
Moni Shoua75c78502009-09-15 02:37:40 -07001349
1350 ASSERT_RTNL();
1351
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001352 for_each_pmc_rtnl(in_dev, pmc)
1353 igmp_group_added(pmc);
Moni Shoua75c78502009-09-15 02:37:40 -07001354}
1355
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356/* Device going down */
1357
1358void ip_mc_down(struct in_device *in_dev)
1359{
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001360 struct ip_mc_list *pmc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001361
1362 ASSERT_RTNL();
1363
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001364 for_each_pmc_rtnl(in_dev, pmc)
1365 igmp_group_dropped(pmc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366
1367#ifdef CONFIG_IP_MULTICAST
1368 in_dev->mr_ifc_count = 0;
1369 if (del_timer(&in_dev->mr_ifc_timer))
1370 __in_dev_put(in_dev);
1371 in_dev->mr_gq_running = 0;
1372 if (del_timer(&in_dev->mr_gq_timer))
1373 __in_dev_put(in_dev);
1374 igmpv3_clear_delrec(in_dev);
1375#endif
1376
1377 ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS);
1378}
1379
1380void ip_mc_init_dev(struct in_device *in_dev)
1381{
1382 ASSERT_RTNL();
1383
1384 in_dev->mc_tomb = NULL;
1385#ifdef CONFIG_IP_MULTICAST
1386 in_dev->mr_gq_running = 0;
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -08001387 setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire,
1388 (unsigned long)in_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 in_dev->mr_ifc_count = 0;
Rami Rosenb8bae412008-10-07 15:34:37 -07001390 in_dev->mc_count = 0;
Pavel Emelyanovb24b8a22008-01-23 21:20:07 -08001391 setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire,
1392 (unsigned long)in_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 in_dev->mr_qrv = IGMP_Unsolicited_Report_Count;
1394#endif
1395
Linus Torvalds1da177e2005-04-16 15:20:36 -07001396 spin_lock_init(&in_dev->mc_tomb_lock);
1397}
1398
1399/* Device going up */
1400
1401void ip_mc_up(struct in_device *in_dev)
1402{
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001403 struct ip_mc_list *pmc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001404
1405 ASSERT_RTNL();
1406
1407 ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS);
1408
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001409 for_each_pmc_rtnl(in_dev, pmc)
1410 igmp_group_added(pmc);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001411}
1412
1413/*
1414 * Device is about to be destroyed: clean up.
1415 */
1416
1417void ip_mc_destroy_dev(struct in_device *in_dev)
1418{
1419 struct ip_mc_list *i;
1420
1421 ASSERT_RTNL();
1422
1423 /* Deactivate timers */
1424 ip_mc_down(in_dev);
1425
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001426 while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) {
1427 in_dev->mc_list = i->next_rcu;
Rami Rosenb8bae412008-10-07 15:34:37 -07001428 in_dev->mc_count--;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001429
Veaceslav Falico24cf3af2011-05-23 23:15:05 +00001430 /* We've dropped the groups in ip_mc_down already */
1431 ip_mc_clear_src(i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 ip_ma_put(i);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434}
1435
Eric Dumazet9e917dc2010-10-19 00:39:18 +00001436/* RTNL is locked */
Daniel Lezcano877aced2008-08-13 16:15:57 -07001437static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439 struct net_device *dev = NULL;
1440 struct in_device *idev = NULL;
1441
1442 if (imr->imr_ifindex) {
Daniel Lezcano877aced2008-08-13 16:15:57 -07001443 idev = inetdev_by_index(net, imr->imr_ifindex);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 return idev;
1445 }
1446 if (imr->imr_address.s_addr) {
Eric Dumazet9e917dc2010-10-19 00:39:18 +00001447 dev = __ip_dev_find(net, imr->imr_address.s_addr, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 if (!dev)
1449 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450 }
1451
David S. Millerb23dd4f2011-03-02 14:31:35 -08001452 if (!dev) {
David S. Miller78fbfd82011-03-12 00:00:52 -05001453 struct rtable *rt = ip_route_output(net,
1454 imr->imr_multiaddr.s_addr,
1455 0, 0, 0);
David S. Millerb23dd4f2011-03-02 14:31:35 -08001456 if (!IS_ERR(rt)) {
1457 dev = rt->dst.dev;
1458 ip_rt_put(rt);
1459 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 }
1461 if (dev) {
1462 imr->imr_ifindex = dev->ifindex;
Herbert Xue5ed6392005-10-03 14:35:55 -07001463 idev = __in_dev_get_rtnl(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464 }
1465 return idev;
1466}
1467
1468/*
1469 * Join a socket to a group
1470 */
Brian Haleyab32ea52006-09-22 14:15:41 -07001471int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS;
1472int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473
1474
1475static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode,
Al Viro8f935bb2006-09-27 18:30:07 -07001476 __be32 *psfsrc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477{
1478 struct ip_sf_list *psf, *psf_prev;
1479 int rv = 0;
1480
1481 psf_prev = NULL;
1482 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1483 if (psf->sf_inaddr == *psfsrc)
1484 break;
1485 psf_prev = psf;
1486 }
1487 if (!psf || psf->sf_count[sfmode] == 0) {
1488 /* source filter not found, or count wrong => bug */
1489 return -ESRCH;
1490 }
1491 psf->sf_count[sfmode]--;
1492 if (psf->sf_count[sfmode] == 0) {
1493 ip_rt_multicast_event(pmc->interface);
1494 }
1495 if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
1496#ifdef CONFIG_IP_MULTICAST
1497 struct in_device *in_dev = pmc->interface;
1498#endif
1499
1500 /* no more filters for this source */
1501 if (psf_prev)
1502 psf_prev->sf_next = psf->sf_next;
1503 else
1504 pmc->sources = psf->sf_next;
1505#ifdef CONFIG_IP_MULTICAST
1506 if (psf->sf_oldin &&
1507 !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001508 psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509 IGMP_Unsolicited_Report_Count;
1510 psf->sf_next = pmc->tomb;
1511 pmc->tomb = psf;
1512 rv = 1;
1513 } else
1514#endif
1515 kfree(psf);
1516 }
1517 return rv;
1518}
1519
1520#ifndef CONFIG_IP_MULTICAST
1521#define igmp_ifc_event(x) do { } while (0)
1522#endif
1523
Al Viro8f935bb2006-09-27 18:30:07 -07001524static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1525 int sfcount, __be32 *psfsrc, int delta)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001526{
1527 struct ip_mc_list *pmc;
1528 int changerec = 0;
1529 int i, err;
1530
1531 if (!in_dev)
1532 return -ENODEV;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001533 rcu_read_lock();
1534 for_each_pmc_rcu(in_dev, pmc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535 if (*pmca == pmc->multiaddr)
1536 break;
1537 }
1538 if (!pmc) {
1539 /* MCA not found?? bug */
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001540 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 return -ESRCH;
1542 }
1543 spin_lock_bh(&pmc->lock);
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001544 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545#ifdef CONFIG_IP_MULTICAST
1546 sf_markstate(pmc);
1547#endif
1548 if (!delta) {
1549 err = -EINVAL;
1550 if (!pmc->sfcount[sfmode])
1551 goto out_unlock;
1552 pmc->sfcount[sfmode]--;
1553 }
1554 err = 0;
1555 for (i=0; i<sfcount; i++) {
1556 int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]);
1557
1558 changerec |= rv > 0;
1559 if (!err && rv < 0)
1560 err = rv;
1561 }
1562 if (pmc->sfmode == MCAST_EXCLUDE &&
1563 pmc->sfcount[MCAST_EXCLUDE] == 0 &&
1564 pmc->sfcount[MCAST_INCLUDE]) {
1565#ifdef CONFIG_IP_MULTICAST
1566 struct ip_sf_list *psf;
1567#endif
1568
1569 /* filter mode change */
1570 pmc->sfmode = MCAST_INCLUDE;
1571#ifdef CONFIG_IP_MULTICAST
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001572 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573 IGMP_Unsolicited_Report_Count;
1574 in_dev->mr_ifc_count = pmc->crcount;
1575 for (psf=pmc->sources; psf; psf = psf->sf_next)
1576 psf->sf_crcount = 0;
1577 igmp_ifc_event(pmc->interface);
1578 } else if (sf_setstate(pmc) || changerec) {
1579 igmp_ifc_event(pmc->interface);
1580#endif
1581 }
1582out_unlock:
1583 spin_unlock_bh(&pmc->lock);
1584 return err;
1585}
1586
1587/*
1588 * Add multicast single-source filter to the interface list
1589 */
1590static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode,
Jun Zhao5eb81e892011-11-30 06:21:04 +00001591 __be32 *psfsrc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001592{
1593 struct ip_sf_list *psf, *psf_prev;
1594
1595 psf_prev = NULL;
1596 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1597 if (psf->sf_inaddr == *psfsrc)
1598 break;
1599 psf_prev = psf;
1600 }
1601 if (!psf) {
Panagiotis Issaris0da974f2006-07-21 14:51:30 -07001602 psf = kzalloc(sizeof(*psf), GFP_ATOMIC);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 if (!psf)
1604 return -ENOBUFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001605 psf->sf_inaddr = *psfsrc;
1606 if (psf_prev) {
1607 psf_prev->sf_next = psf;
1608 } else
1609 pmc->sources = psf;
1610 }
1611 psf->sf_count[sfmode]++;
1612 if (psf->sf_count[sfmode] == 1) {
1613 ip_rt_multicast_event(pmc->interface);
1614 }
1615 return 0;
1616}
1617
1618#ifdef CONFIG_IP_MULTICAST
1619static void sf_markstate(struct ip_mc_list *pmc)
1620{
1621 struct ip_sf_list *psf;
1622 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1623
1624 for (psf=pmc->sources; psf; psf=psf->sf_next)
1625 if (pmc->sfcount[MCAST_EXCLUDE]) {
1626 psf->sf_oldin = mca_xcount ==
1627 psf->sf_count[MCAST_EXCLUDE] &&
1628 !psf->sf_count[MCAST_INCLUDE];
1629 } else
1630 psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
1631}
1632
1633static int sf_setstate(struct ip_mc_list *pmc)
1634{
David L Stevensad125832006-01-18 14:20:56 -08001635 struct ip_sf_list *psf, *dpsf;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636 int mca_xcount = pmc->sfcount[MCAST_EXCLUDE];
1637 int qrv = pmc->interface->mr_qrv;
1638 int new_in, rv;
1639
1640 rv = 0;
1641 for (psf=pmc->sources; psf; psf=psf->sf_next) {
1642 if (pmc->sfcount[MCAST_EXCLUDE]) {
1643 new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
1644 !psf->sf_count[MCAST_INCLUDE];
1645 } else
1646 new_in = psf->sf_count[MCAST_INCLUDE] != 0;
David L Stevensad125832006-01-18 14:20:56 -08001647 if (new_in) {
1648 if (!psf->sf_oldin) {
Al Viro76edc602006-02-01 05:54:35 -05001649 struct ip_sf_list *prev = NULL;
David L Stevensad125832006-01-18 14:20:56 -08001650
1651 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) {
1652 if (dpsf->sf_inaddr == psf->sf_inaddr)
1653 break;
1654 prev = dpsf;
1655 }
1656 if (dpsf) {
1657 if (prev)
1658 prev->sf_next = dpsf->sf_next;
1659 else
1660 pmc->tomb = dpsf->sf_next;
1661 kfree(dpsf);
1662 }
1663 psf->sf_crcount = qrv;
1664 rv++;
1665 }
1666 } else if (psf->sf_oldin) {
1667
1668 psf->sf_crcount = 0;
1669 /*
1670 * add or update "delete" records if an active filter
1671 * is now inactive
1672 */
1673 for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next)
1674 if (dpsf->sf_inaddr == psf->sf_inaddr)
1675 break;
1676 if (!dpsf) {
Joe Perches3ed37a62010-05-31 17:23:21 +00001677 dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
David L Stevensad125832006-01-18 14:20:56 -08001678 if (!dpsf)
1679 continue;
1680 *dpsf = *psf;
1681 /* pmc->lock held by callers */
1682 dpsf->sf_next = pmc->tomb;
1683 pmc->tomb = dpsf;
1684 }
1685 dpsf->sf_crcount = qrv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686 rv++;
1687 }
1688 }
1689 return rv;
1690}
1691#endif
1692
1693/*
1694 * Add multicast source filter list to the interface list
1695 */
Al Viro8f935bb2006-09-27 18:30:07 -07001696static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode,
1697 int sfcount, __be32 *psfsrc, int delta)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001698{
1699 struct ip_mc_list *pmc;
1700 int isexclude;
1701 int i, err;
1702
1703 if (!in_dev)
1704 return -ENODEV;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001705 rcu_read_lock();
1706 for_each_pmc_rcu(in_dev, pmc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001707 if (*pmca == pmc->multiaddr)
1708 break;
1709 }
1710 if (!pmc) {
1711 /* MCA not found?? bug */
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001712 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001713 return -ESRCH;
1714 }
1715 spin_lock_bh(&pmc->lock);
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001716 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001717
1718#ifdef CONFIG_IP_MULTICAST
1719 sf_markstate(pmc);
1720#endif
1721 isexclude = pmc->sfmode == MCAST_EXCLUDE;
1722 if (!delta)
1723 pmc->sfcount[sfmode]++;
1724 err = 0;
1725 for (i=0; i<sfcount; i++) {
Jun Zhao5eb81e892011-11-30 06:21:04 +00001726 err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001727 if (err)
1728 break;
1729 }
1730 if (err) {
1731 int j;
1732
Jun Zhao685f94e62011-11-22 17:19:03 +00001733 if (!delta)
1734 pmc->sfcount[sfmode]--;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001735 for (j=0; j<i; j++)
Julia Lawalla1889c02011-07-28 02:46:01 +00001736 (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001737 } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) {
1738#ifdef CONFIG_IP_MULTICAST
Linus Torvalds1da177e2005-04-16 15:20:36 -07001739 struct ip_sf_list *psf;
Stephen Hemmingercfcabdc2007-10-09 01:59:42 -07001740 in_dev = pmc->interface;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001741#endif
1742
1743 /* filter mode change */
1744 if (pmc->sfcount[MCAST_EXCLUDE])
1745 pmc->sfmode = MCAST_EXCLUDE;
1746 else if (pmc->sfcount[MCAST_INCLUDE])
1747 pmc->sfmode = MCAST_INCLUDE;
1748#ifdef CONFIG_IP_MULTICAST
1749 /* else no filters; keep old mode for reports */
1750
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001751 pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv :
Linus Torvalds1da177e2005-04-16 15:20:36 -07001752 IGMP_Unsolicited_Report_Count;
1753 in_dev->mr_ifc_count = pmc->crcount;
1754 for (psf=pmc->sources; psf; psf = psf->sf_next)
1755 psf->sf_crcount = 0;
1756 igmp_ifc_event(in_dev);
1757 } else if (sf_setstate(pmc)) {
1758 igmp_ifc_event(in_dev);
1759#endif
1760 }
1761 spin_unlock_bh(&pmc->lock);
1762 return err;
1763}
1764
1765static void ip_mc_clear_src(struct ip_mc_list *pmc)
1766{
1767 struct ip_sf_list *psf, *nextpsf;
1768
1769 for (psf=pmc->tomb; psf; psf=nextpsf) {
1770 nextpsf = psf->sf_next;
1771 kfree(psf);
1772 }
1773 pmc->tomb = NULL;
1774 for (psf=pmc->sources; psf; psf=nextpsf) {
1775 nextpsf = psf->sf_next;
1776 kfree(psf);
1777 }
1778 pmc->sources = NULL;
1779 pmc->sfmode = MCAST_EXCLUDE;
Denis Lukianovde9daad2005-09-14 20:53:42 -07001780 pmc->sfcount[MCAST_INCLUDE] = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001781 pmc->sfcount[MCAST_EXCLUDE] = 1;
1782}
1783
1784
1785/*
1786 * Join a multicast group
1787 */
1788int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
1789{
1790 int err;
Al Viro8f935bb2006-09-27 18:30:07 -07001791 __be32 addr = imr->imr_multiaddr.s_addr;
Jianjun Konga7e9ff72008-11-03 00:26:09 -08001792 struct ip_mc_socklist *iml = NULL, *i;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001793 struct in_device *in_dev;
1794 struct inet_sock *inet = inet_sk(sk);
Daniel Lezcano877aced2008-08-13 16:15:57 -07001795 struct net *net = sock_net(sk);
David L Stevensca9b9072005-07-08 17:38:07 -07001796 int ifindex;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001797 int count = 0;
1798
Joe Perchesf97c1e02007-12-16 13:45:43 -08001799 if (!ipv4_is_multicast(addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001800 return -EINVAL;
1801
Stephen Hemminger6756ae42006-03-20 22:23:58 -08001802 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001803
Daniel Lezcano877aced2008-08-13 16:15:57 -07001804 in_dev = ip_mc_find_dev(net, imr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001805
1806 if (!in_dev) {
1807 iml = NULL;
1808 err = -ENODEV;
1809 goto done;
1810 }
1811
Linus Torvalds1da177e2005-04-16 15:20:36 -07001812 err = -EADDRINUSE;
David L Stevensca9b9072005-07-08 17:38:07 -07001813 ifindex = imr->imr_ifindex;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001814 for_each_pmc_rtnl(inet, i) {
David L Stevensca9b9072005-07-08 17:38:07 -07001815 if (i->multi.imr_multiaddr.s_addr == addr &&
1816 i->multi.imr_ifindex == ifindex)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001817 goto done;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001818 count++;
1819 }
1820 err = -ENOBUFS;
David L Stevensca9b9072005-07-08 17:38:07 -07001821 if (count >= sysctl_igmp_max_memberships)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001822 goto done;
Jianjun Konga7e9ff72008-11-03 00:26:09 -08001823 iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL);
David L Stevensca9b9072005-07-08 17:38:07 -07001824 if (iml == NULL)
1825 goto done;
1826
Linus Torvalds1da177e2005-04-16 15:20:36 -07001827 memcpy(&iml->multi, imr, sizeof(*imr));
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001828 iml->next_rcu = inet->mc_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001829 iml->sflist = NULL;
1830 iml->sfmode = MCAST_EXCLUDE;
Eric Dumazetcf778b02012-01-12 04:41:32 +00001831 rcu_assign_pointer(inet->mc_list, iml);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001832 ip_mc_inc_group(in_dev, addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001833 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001834done:
Stephen Hemminger6756ae42006-03-20 22:23:58 -08001835 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001836 return err;
1837}
Eric Dumazet4bc2f182010-07-09 21:22:10 +00001838EXPORT_SYMBOL(ip_mc_join_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001839
1840static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
1841 struct in_device *in_dev)
1842{
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001843 struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001844 int err;
1845
Flavio Leitnerc85bb412010-02-02 07:32:29 -08001846 if (psf == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001847 /* any-source empty exclude case */
1848 return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
1849 iml->sfmode, 0, NULL, 0);
1850 }
1851 err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr,
Flavio Leitnerc85bb412010-02-02 07:32:29 -08001852 iml->sfmode, psf->sl_count, psf->sl_addr, 0);
Stephen Hemmingera9b3cd72011-08-01 16:19:00 +00001853 RCU_INIT_POINTER(iml->sflist, NULL);
Flavio Leitnerc85bb412010-02-02 07:32:29 -08001854 /* decrease mem now to avoid the memleak warning */
1855 atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc);
Lai Jiangshan7519cce2011-03-18 11:44:46 +08001856 kfree_rcu(psf, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001857 return err;
1858}
1859
1860/*
1861 * Ask a socket to leave a group.
1862 */
1863
1864int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
1865{
1866 struct inet_sock *inet = inet_sk(sk);
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001867 struct ip_mc_socklist *iml;
1868 struct ip_mc_socklist __rcu **imlp;
David L Stevens84b42ba2005-07-08 17:48:38 -07001869 struct in_device *in_dev;
Daniel Lezcano877aced2008-08-13 16:15:57 -07001870 struct net *net = sock_net(sk);
Al Viro8f935bb2006-09-27 18:30:07 -07001871 __be32 group = imr->imr_multiaddr.s_addr;
David L Stevens84b42ba2005-07-08 17:48:38 -07001872 u32 ifindex;
David L Stevensacd6e002006-08-17 16:27:39 -07001873 int ret = -EADDRNOTAVAIL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001874
1875 rtnl_lock();
Daniel Lezcano877aced2008-08-13 16:15:57 -07001876 in_dev = ip_mc_find_dev(net, imr);
David L Stevens84b42ba2005-07-08 17:48:38 -07001877 ifindex = imr->imr_ifindex;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001878 for (imlp = &inet->mc_list;
1879 (iml = rtnl_dereference(*imlp)) != NULL;
1880 imlp = &iml->next_rcu) {
David L Stevensacd6e002006-08-17 16:27:39 -07001881 if (iml->multi.imr_multiaddr.s_addr != group)
1882 continue;
1883 if (ifindex) {
1884 if (iml->multi.imr_ifindex != ifindex)
1885 continue;
1886 } else if (imr->imr_address.s_addr && imr->imr_address.s_addr !=
1887 iml->multi.imr_address.s_addr)
1888 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001889
David L Stevensacd6e002006-08-17 16:27:39 -07001890 (void) ip_mc_leave_src(sk, iml, in_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001891
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001892 *imlp = iml->next_rcu;
David L Stevensacd6e002006-08-17 16:27:39 -07001893
1894 if (in_dev)
David L Stevens84b42ba2005-07-08 17:48:38 -07001895 ip_mc_dec_group(in_dev, group);
David L Stevensacd6e002006-08-17 16:27:39 -07001896 rtnl_unlock();
Flavio Leitnerc85bb412010-02-02 07:32:29 -08001897 /* decrease mem now to avoid the memleak warning */
1898 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
Lai Jiangshan10d50e72011-03-18 11:45:08 +08001899 kfree_rcu(iml, rcu);
David L Stevensacd6e002006-08-17 16:27:39 -07001900 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001901 }
David L Stevensacd6e002006-08-17 16:27:39 -07001902 if (!in_dev)
1903 ret = -ENODEV;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001904 rtnl_unlock();
David L Stevensacd6e002006-08-17 16:27:39 -07001905 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001906}
stephen hemminger193ba922012-10-01 12:32:34 +00001907EXPORT_SYMBOL(ip_mc_leave_group);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001908
1909int ip_mc_source(int add, int omode, struct sock *sk, struct
1910 ip_mreq_source *mreqs, int ifindex)
1911{
1912 int err;
1913 struct ip_mreqn imr;
Al Viro63007722006-09-27 18:31:32 -07001914 __be32 addr = mreqs->imr_multiaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001915 struct ip_mc_socklist *pmc;
1916 struct in_device *in_dev = NULL;
1917 struct inet_sock *inet = inet_sk(sk);
1918 struct ip_sf_socklist *psl;
Daniel Lezcano877aced2008-08-13 16:15:57 -07001919 struct net *net = sock_net(sk);
David L Stevens8cdaaa12005-07-08 17:39:23 -07001920 int leavegroup = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001921 int i, j, rv;
1922
Joe Perchesf97c1e02007-12-16 13:45:43 -08001923 if (!ipv4_is_multicast(addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001924 return -EINVAL;
1925
Stephen Hemminger6756ae42006-03-20 22:23:58 -08001926 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001927
1928 imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
1929 imr.imr_address.s_addr = mreqs->imr_interface;
1930 imr.imr_ifindex = ifindex;
Daniel Lezcano877aced2008-08-13 16:15:57 -07001931 in_dev = ip_mc_find_dev(net, &imr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001932
1933 if (!in_dev) {
1934 err = -ENODEV;
1935 goto done;
1936 }
1937 err = -EADDRNOTAVAIL;
1938
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001939 for_each_pmc_rtnl(inet, pmc) {
Joe Perchesf64f9e72009-11-29 16:55:45 -08001940 if ((pmc->multi.imr_multiaddr.s_addr ==
1941 imr.imr_multiaddr.s_addr) &&
1942 (pmc->multi.imr_ifindex == imr.imr_ifindex))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001943 break;
1944 }
David L Stevens917f2f12005-07-08 17:45:16 -07001945 if (!pmc) { /* must have a prior join */
1946 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001947 goto done;
David L Stevens917f2f12005-07-08 17:45:16 -07001948 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001949 /* if a source filter was set, must be the same mode as before */
1950 if (pmc->sflist) {
David L Stevens917f2f12005-07-08 17:45:16 -07001951 if (pmc->sfmode != omode) {
1952 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001953 goto done;
David L Stevens917f2f12005-07-08 17:45:16 -07001954 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001955 } else if (pmc->sfmode != omode) {
1956 /* allow mode switches for empty-set filters */
1957 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001958 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001959 NULL, 0);
1960 pmc->sfmode = omode;
1961 }
1962
Eric Dumazet1d7138d2010-11-12 05:46:50 +00001963 psl = rtnl_dereference(pmc->sflist);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001964 if (!add) {
1965 if (!psl)
David L Stevens917f2f12005-07-08 17:45:16 -07001966 goto done; /* err = -EADDRNOTAVAIL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001967 rv = !0;
1968 for (i=0; i<psl->sl_count; i++) {
1969 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
Al Viro63007722006-09-27 18:31:32 -07001970 sizeof(__be32));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001971 if (rv == 0)
1972 break;
1973 }
1974 if (rv) /* source not found */
David L Stevens917f2f12005-07-08 17:45:16 -07001975 goto done; /* err = -EADDRNOTAVAIL */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001976
David L Stevens8cdaaa12005-07-08 17:39:23 -07001977 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
1978 if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
1979 leavegroup = 1;
1980 goto done;
1981 }
1982
Linus Torvalds1da177e2005-04-16 15:20:36 -07001983 /* update the interface filter */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001984 ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001985 &mreqs->imr_sourceaddr, 1);
1986
1987 for (j=i+1; j<psl->sl_count; j++)
1988 psl->sl_addr[j-1] = psl->sl_addr[j];
1989 psl->sl_count--;
1990 err = 0;
1991 goto done;
1992 }
1993 /* else, add a new source to the filter */
1994
1995 if (psl && psl->sl_count >= sysctl_igmp_max_msf) {
1996 err = -ENOBUFS;
1997 goto done;
1998 }
1999 if (!psl || psl->sl_count == psl->sl_max) {
2000 struct ip_sf_socklist *newpsl;
2001 int count = IP_SFBLOCK;
2002
2003 if (psl)
2004 count += psl->sl_max;
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08002005 newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002006 if (!newpsl) {
2007 err = -ENOBUFS;
2008 goto done;
2009 }
2010 newpsl->sl_max = count;
2011 newpsl->sl_count = count - IP_SFBLOCK;
2012 if (psl) {
2013 for (i=0; i<psl->sl_count; i++)
2014 newpsl->sl_addr[i] = psl->sl_addr[i];
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002015 /* decrease mem now to avoid the memleak warning */
2016 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
Lai Jiangshan7519cce2011-03-18 11:44:46 +08002017 kfree_rcu(psl, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002018 }
Eric Dumazetcf778b02012-01-12 04:41:32 +00002019 rcu_assign_pointer(pmc->sflist, newpsl);
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002020 psl = newpsl;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002021 }
2022 rv = 1; /* > 0 for insert logic below if sl_count is 0 */
2023 for (i=0; i<psl->sl_count; i++) {
2024 rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr,
Al Viro63007722006-09-27 18:31:32 -07002025 sizeof(__be32));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002026 if (rv == 0)
2027 break;
2028 }
2029 if (rv == 0) /* address already there is an error */
2030 goto done;
2031 for (j=psl->sl_count-1; j>=i; j--)
2032 psl->sl_addr[j+1] = psl->sl_addr[j];
2033 psl->sl_addr[i] = mreqs->imr_sourceaddr;
2034 psl->sl_count++;
2035 err = 0;
2036 /* update the interface list */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002037 ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002038 &mreqs->imr_sourceaddr, 1);
2039done:
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002040 rtnl_unlock();
David L Stevens8cdaaa12005-07-08 17:39:23 -07002041 if (leavegroup)
2042 return ip_mc_leave_group(sk, &imr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002043 return err;
2044}
2045
2046int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
2047{
David L Stevens9951f032005-07-08 17:47:28 -07002048 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002049 struct ip_mreqn imr;
Al Viro63007722006-09-27 18:31:32 -07002050 __be32 addr = msf->imsf_multiaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002051 struct ip_mc_socklist *pmc;
2052 struct in_device *in_dev;
2053 struct inet_sock *inet = inet_sk(sk);
2054 struct ip_sf_socklist *newpsl, *psl;
Daniel Lezcano877aced2008-08-13 16:15:57 -07002055 struct net *net = sock_net(sk);
David L Stevens9951f032005-07-08 17:47:28 -07002056 int leavegroup = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002057
Joe Perchesf97c1e02007-12-16 13:45:43 -08002058 if (!ipv4_is_multicast(addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002059 return -EINVAL;
2060 if (msf->imsf_fmode != MCAST_INCLUDE &&
2061 msf->imsf_fmode != MCAST_EXCLUDE)
2062 return -EINVAL;
2063
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002064 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002065
2066 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2067 imr.imr_address.s_addr = msf->imsf_interface;
2068 imr.imr_ifindex = ifindex;
Daniel Lezcano877aced2008-08-13 16:15:57 -07002069 in_dev = ip_mc_find_dev(net, &imr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002070
2071 if (!in_dev) {
2072 err = -ENODEV;
2073 goto done;
2074 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002075
David L Stevens9951f032005-07-08 17:47:28 -07002076 /* special case - (INCLUDE, empty) == LEAVE_GROUP */
2077 if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) {
2078 leavegroup = 1;
2079 goto done;
2080 }
2081
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002082 for_each_pmc_rtnl(inet, pmc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002083 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2084 pmc->multi.imr_ifindex == imr.imr_ifindex)
2085 break;
2086 }
David L Stevens917f2f12005-07-08 17:45:16 -07002087 if (!pmc) { /* must have a prior join */
2088 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002089 goto done;
David L Stevens917f2f12005-07-08 17:45:16 -07002090 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002091 if (msf->imsf_numsrc) {
Kris Katterjohn8b3a7002006-01-11 15:56:43 -08002092 newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc),
2093 GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002094 if (!newpsl) {
2095 err = -ENOBUFS;
2096 goto done;
2097 }
2098 newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc;
2099 memcpy(newpsl->sl_addr, msf->imsf_slist,
2100 msf->imsf_numsrc * sizeof(msf->imsf_slist[0]));
2101 err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2102 msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0);
2103 if (err) {
2104 sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max));
2105 goto done;
2106 }
Yan Zheng8713dbf2005-10-28 08:02:08 +08002107 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002108 newpsl = NULL;
Yan Zheng8713dbf2005-10-28 08:02:08 +08002109 (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr,
2110 msf->imsf_fmode, 0, NULL, 0);
2111 }
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002112 psl = rtnl_dereference(pmc->sflist);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002113 if (psl) {
2114 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2115 psl->sl_count, psl->sl_addr, 0);
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002116 /* decrease mem now to avoid the memleak warning */
2117 atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc);
Lai Jiangshan7519cce2011-03-18 11:44:46 +08002118 kfree_rcu(psl, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002119 } else
2120 (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode,
2121 0, NULL, 0);
Eric Dumazetcf778b02012-01-12 04:41:32 +00002122 rcu_assign_pointer(pmc->sflist, newpsl);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002123 pmc->sfmode = msf->imsf_fmode;
David L Stevens917f2f12005-07-08 17:45:16 -07002124 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002125done:
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002126 rtnl_unlock();
David L Stevens9951f032005-07-08 17:47:28 -07002127 if (leavegroup)
2128 err = ip_mc_leave_group(sk, &imr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002129 return err;
2130}
2131
2132int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf,
2133 struct ip_msfilter __user *optval, int __user *optlen)
2134{
2135 int err, len, count, copycount;
2136 struct ip_mreqn imr;
Al Viro63007722006-09-27 18:31:32 -07002137 __be32 addr = msf->imsf_multiaddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002138 struct ip_mc_socklist *pmc;
2139 struct in_device *in_dev;
2140 struct inet_sock *inet = inet_sk(sk);
2141 struct ip_sf_socklist *psl;
Daniel Lezcano877aced2008-08-13 16:15:57 -07002142 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002143
Joe Perchesf97c1e02007-12-16 13:45:43 -08002144 if (!ipv4_is_multicast(addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002145 return -EINVAL;
2146
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002147 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002148
2149 imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
2150 imr.imr_address.s_addr = msf->imsf_interface;
2151 imr.imr_ifindex = 0;
Daniel Lezcano877aced2008-08-13 16:15:57 -07002152 in_dev = ip_mc_find_dev(net, &imr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002153
2154 if (!in_dev) {
2155 err = -ENODEV;
2156 goto done;
2157 }
2158 err = -EADDRNOTAVAIL;
2159
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002160 for_each_pmc_rtnl(inet, pmc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002161 if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr &&
2162 pmc->multi.imr_ifindex == imr.imr_ifindex)
2163 break;
2164 }
2165 if (!pmc) /* must have a prior join */
2166 goto done;
2167 msf->imsf_fmode = pmc->sfmode;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002168 psl = rtnl_dereference(pmc->sflist);
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002169 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002170 if (!psl) {
2171 len = 0;
2172 count = 0;
2173 } else {
2174 count = psl->sl_count;
2175 }
2176 copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc;
2177 len = copycount * sizeof(psl->sl_addr[0]);
2178 msf->imsf_numsrc = count;
2179 if (put_user(IP_MSFILTER_SIZE(copycount), optlen) ||
2180 copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) {
2181 return -EFAULT;
2182 }
2183 if (len &&
2184 copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len))
2185 return -EFAULT;
2186 return 0;
2187done:
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002188 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002189 return err;
2190}
2191
2192int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf,
2193 struct group_filter __user *optval, int __user *optlen)
2194{
2195 int err, i, count, copycount;
2196 struct sockaddr_in *psin;
Al Viro63007722006-09-27 18:31:32 -07002197 __be32 addr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002198 struct ip_mc_socklist *pmc;
2199 struct inet_sock *inet = inet_sk(sk);
2200 struct ip_sf_socklist *psl;
2201
2202 psin = (struct sockaddr_in *)&gsf->gf_group;
2203 if (psin->sin_family != AF_INET)
2204 return -EINVAL;
2205 addr = psin->sin_addr.s_addr;
Joe Perchesf97c1e02007-12-16 13:45:43 -08002206 if (!ipv4_is_multicast(addr))
Linus Torvalds1da177e2005-04-16 15:20:36 -07002207 return -EINVAL;
2208
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002209 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002210
2211 err = -EADDRNOTAVAIL;
2212
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002213 for_each_pmc_rtnl(inet, pmc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002214 if (pmc->multi.imr_multiaddr.s_addr == addr &&
2215 pmc->multi.imr_ifindex == gsf->gf_interface)
2216 break;
2217 }
2218 if (!pmc) /* must have a prior join */
2219 goto done;
2220 gsf->gf_fmode = pmc->sfmode;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002221 psl = rtnl_dereference(pmc->sflist);
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002222 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002223 count = psl ? psl->sl_count : 0;
2224 copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
2225 gsf->gf_numsrc = count;
2226 if (put_user(GROUP_FILTER_SIZE(copycount), optlen) ||
2227 copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
2228 return -EFAULT;
2229 }
2230 for (i=0; i<copycount; i++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002231 struct sockaddr_storage ss;
2232
2233 psin = (struct sockaddr_in *)&ss;
2234 memset(&ss, 0, sizeof(ss));
2235 psin->sin_family = AF_INET;
2236 psin->sin_addr.s_addr = psl->sl_addr[i];
2237 if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss)))
2238 return -EFAULT;
2239 }
2240 return 0;
2241done:
Stephen Hemminger6756ae42006-03-20 22:23:58 -08002242 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002243 return err;
2244}
2245
2246/*
2247 * check if a multicast source filter allows delivery for a given <src,dst,intf>
2248 */
Al Viroc0cda062006-09-27 18:31:10 -07002249int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002250{
2251 struct inet_sock *inet = inet_sk(sk);
2252 struct ip_mc_socklist *pmc;
2253 struct ip_sf_socklist *psl;
2254 int i;
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002255 int ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002256
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002257 ret = 1;
Joe Perchesf97c1e02007-12-16 13:45:43 -08002258 if (!ipv4_is_multicast(loc_addr))
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002259 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002260
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002261 rcu_read_lock();
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002262 for_each_pmc_rcu(inet, pmc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002263 if (pmc->multi.imr_multiaddr.s_addr == loc_addr &&
2264 pmc->multi.imr_ifindex == dif)
2265 break;
2266 }
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002267 ret = inet->mc_all;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002268 if (!pmc)
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002269 goto unlock;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002270 psl = rcu_dereference(pmc->sflist);
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002271 ret = (pmc->sfmode == MCAST_EXCLUDE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002272 if (!psl)
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002273 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002274
2275 for (i=0; i<psl->sl_count; i++) {
2276 if (psl->sl_addr[i] == rmt_addr)
2277 break;
2278 }
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002279 ret = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002280 if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002281 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002282 if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002283 goto unlock;
2284 ret = 1;
2285unlock:
2286 rcu_read_unlock();
2287out:
2288 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002289}
2290
2291/*
2292 * A socket is closing.
2293 */
2294
2295void ip_mc_drop_socket(struct sock *sk)
2296{
2297 struct inet_sock *inet = inet_sk(sk);
2298 struct ip_mc_socklist *iml;
Daniel Lezcano877aced2008-08-13 16:15:57 -07002299 struct net *net = sock_net(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002300
2301 if (inet->mc_list == NULL)
2302 return;
2303
2304 rtnl_lock();
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002305 while ((iml = rtnl_dereference(inet->mc_list)) != NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002306 struct in_device *in_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002307
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002308 inet->mc_list = iml->next_rcu;
Daniel Lezcano877aced2008-08-13 16:15:57 -07002309 in_dev = inetdev_by_index(net, iml->multi.imr_ifindex);
Michal Ruzickabb699cbc2006-08-15 00:20:17 -07002310 (void) ip_mc_leave_src(sk, iml, in_dev);
Eric Dumazet18943d22010-11-08 11:15:54 +00002311 if (in_dev != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002312 ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr);
Flavio Leitnerc85bb412010-02-02 07:32:29 -08002313 /* decrease mem now to avoid the memleak warning */
2314 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
Lai Jiangshan10d50e72011-03-18 11:45:08 +08002315 kfree_rcu(iml, rcu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002316 }
2317 rtnl_unlock();
2318}
2319
David S. Millerdbdd9a52011-03-10 16:34:38 -08002320/* called with rcu_read_lock() */
2321int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002322{
2323 struct ip_mc_list *im;
2324 struct ip_sf_list *psf;
2325 int rv = 0;
2326
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002327 for_each_pmc_rcu(in_dev, im) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002328 if (im->multiaddr == mc_addr)
2329 break;
2330 }
2331 if (im && proto == IPPROTO_IGMP) {
2332 rv = 1;
2333 } else if (im) {
2334 if (src_addr) {
2335 for (psf=im->sources; psf; psf=psf->sf_next) {
2336 if (psf->sf_inaddr == src_addr)
2337 break;
2338 }
2339 if (psf)
2340 rv = psf->sf_count[MCAST_INCLUDE] ||
2341 psf->sf_count[MCAST_EXCLUDE] !=
2342 im->sfcount[MCAST_EXCLUDE];
2343 else
2344 rv = im->sfcount[MCAST_EXCLUDE] != 0;
2345 } else
2346 rv = 1; /* unspecified source; tentatively allow */
2347 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002348 return rv;
2349}
2350
2351#if defined(CONFIG_PROC_FS)
2352struct igmp_mc_iter_state {
Alexey Dobriyan7091e722008-12-25 16:42:51 -08002353 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002354 struct net_device *dev;
2355 struct in_device *in_dev;
2356};
2357
2358#define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private)
2359
2360static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq)
2361{
Alexey Dobriyan7091e722008-12-25 16:42:51 -08002362 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002363 struct ip_mc_list *im = NULL;
2364 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2365
Pavel Emelianov7562f872007-05-03 15:13:45 -07002366 state->in_dev = NULL;
stephen hemminger61fbab72009-11-10 07:54:55 +00002367 for_each_netdev_rcu(net, state->dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002368 struct in_device *in_dev;
Eric Dumazet6baff152009-11-11 17:48:52 +00002369
2370 in_dev = __in_dev_get_rcu(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002371 if (!in_dev)
2372 continue;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002373 im = rcu_dereference(in_dev->mc_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002374 if (im) {
2375 state->in_dev = in_dev;
2376 break;
2377 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002378 }
2379 return im;
2380}
2381
2382static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im)
2383{
2384 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
Eric Dumazet6baff152009-11-11 17:48:52 +00002385
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002386 im = rcu_dereference(im->next_rcu);
2387 while (!im) {
Eric Dumazet6baff152009-11-11 17:48:52 +00002388 state->dev = next_net_device_rcu(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002389 if (!state->dev) {
2390 state->in_dev = NULL;
2391 break;
2392 }
Eric Dumazet6baff152009-11-11 17:48:52 +00002393 state->in_dev = __in_dev_get_rcu(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002394 if (!state->in_dev)
2395 continue;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002396 im = rcu_dereference(state->in_dev->mc_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002397 }
2398 return im;
2399}
2400
2401static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos)
2402{
2403 struct ip_mc_list *im = igmp_mc_get_first(seq);
2404 if (im)
2405 while (pos && (im = igmp_mc_get_next(seq, im)) != NULL)
2406 --pos;
2407 return pos ? NULL : im;
2408}
2409
2410static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos)
stephen hemminger61fbab72009-11-10 07:54:55 +00002411 __acquires(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002412{
stephen hemminger61fbab72009-11-10 07:54:55 +00002413 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002414 return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2415}
2416
2417static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2418{
2419 struct ip_mc_list *im;
2420 if (v == SEQ_START_TOKEN)
2421 im = igmp_mc_get_first(seq);
2422 else
2423 im = igmp_mc_get_next(seq, v);
2424 ++*pos;
2425 return im;
2426}
2427
2428static void igmp_mc_seq_stop(struct seq_file *seq, void *v)
stephen hemminger61fbab72009-11-10 07:54:55 +00002429 __releases(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002430{
2431 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002432
2433 state->in_dev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002434 state->dev = NULL;
stephen hemminger61fbab72009-11-10 07:54:55 +00002435 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002436}
2437
2438static int igmp_mc_seq_show(struct seq_file *seq, void *v)
2439{
2440 if (v == SEQ_START_TOKEN)
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002441 seq_puts(seq,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002442 "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n");
2443 else {
2444 struct ip_mc_list *im = (struct ip_mc_list *)v;
2445 struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq);
2446 char *querier;
Eric Dumazeta399a802012-08-08 21:13:53 +00002447 long delta;
2448
Linus Torvalds1da177e2005-04-16 15:20:36 -07002449#ifdef CONFIG_IP_MULTICAST
2450 querier = IGMP_V1_SEEN(state->in_dev) ? "V1" :
2451 IGMP_V2_SEEN(state->in_dev) ? "V2" :
2452 "V3";
2453#else
2454 querier = "NONE";
2455#endif
2456
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002457 if (rcu_dereference(state->in_dev->mc_list) == im) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002458 seq_printf(seq, "%d\t%-10s: %5d %7s\n",
Rami Rosenb8bae412008-10-07 15:34:37 -07002459 state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002460 }
2461
Eric Dumazeta399a802012-08-08 21:13:53 +00002462 delta = im->timer.expires - jiffies;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002463 seq_printf(seq,
Alexey Dobriyan338fcf92006-06-05 21:04:39 -07002464 "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -07002465 im->multiaddr, im->users,
Eric Dumazeta399a802012-08-08 21:13:53 +00002466 im->tm_running,
2467 im->tm_running ? jiffies_delta_to_clock_t(delta) : 0,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002468 im->reporter);
2469 }
2470 return 0;
2471}
2472
Stephen Hemmingerf6908082007-03-12 14:34:29 -07002473static const struct seq_operations igmp_mc_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002474 .start = igmp_mc_seq_start,
2475 .next = igmp_mc_seq_next,
2476 .stop = igmp_mc_seq_stop,
2477 .show = igmp_mc_seq_show,
2478};
2479
2480static int igmp_mc_seq_open(struct inode *inode, struct file *file)
2481{
Alexey Dobriyan7091e722008-12-25 16:42:51 -08002482 return seq_open_net(inode, file, &igmp_mc_seq_ops,
Pavel Emelyanovcf7732e2007-10-10 02:29:29 -07002483 sizeof(struct igmp_mc_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002484}
2485
Arjan van de Ven9a321442007-02-12 00:55:35 -08002486static const struct file_operations igmp_mc_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002487 .owner = THIS_MODULE,
2488 .open = igmp_mc_seq_open,
2489 .read = seq_read,
2490 .llseek = seq_lseek,
Alexey Dobriyan7091e722008-12-25 16:42:51 -08002491 .release = seq_release_net,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002492};
2493
2494struct igmp_mcf_iter_state {
Alexey Dobriyan7091e722008-12-25 16:42:51 -08002495 struct seq_net_private p;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002496 struct net_device *dev;
2497 struct in_device *idev;
2498 struct ip_mc_list *im;
2499};
2500
2501#define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private)
2502
2503static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq)
2504{
Alexey Dobriyan7091e722008-12-25 16:42:51 -08002505 struct net *net = seq_file_net(seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002506 struct ip_sf_list *psf = NULL;
2507 struct ip_mc_list *im = NULL;
2508 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2509
Pavel Emelianov7562f872007-05-03 15:13:45 -07002510 state->idev = NULL;
2511 state->im = NULL;
stephen hemminger61fbab72009-11-10 07:54:55 +00002512 for_each_netdev_rcu(net, state->dev) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002513 struct in_device *idev;
Eric Dumazet6baff152009-11-11 17:48:52 +00002514 idev = __in_dev_get_rcu(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002515 if (unlikely(idev == NULL))
2516 continue;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002517 im = rcu_dereference(idev->mc_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002518 if (likely(im != NULL)) {
2519 spin_lock_bh(&im->lock);
2520 psf = im->sources;
2521 if (likely(psf != NULL)) {
2522 state->im = im;
2523 state->idev = idev;
2524 break;
2525 }
2526 spin_unlock_bh(&im->lock);
2527 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07002528 }
2529 return psf;
2530}
2531
2532static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf)
2533{
2534 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2535
2536 psf = psf->sf_next;
2537 while (!psf) {
2538 spin_unlock_bh(&state->im->lock);
2539 state->im = state->im->next;
2540 while (!state->im) {
Eric Dumazet6baff152009-11-11 17:48:52 +00002541 state->dev = next_net_device_rcu(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002542 if (!state->dev) {
2543 state->idev = NULL;
2544 goto out;
2545 }
Eric Dumazet6baff152009-11-11 17:48:52 +00002546 state->idev = __in_dev_get_rcu(state->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002547 if (!state->idev)
2548 continue;
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002549 state->im = rcu_dereference(state->idev->mc_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002550 }
2551 if (!state->im)
2552 break;
2553 spin_lock_bh(&state->im->lock);
2554 psf = state->im->sources;
2555 }
2556out:
2557 return psf;
2558}
2559
2560static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos)
2561{
2562 struct ip_sf_list *psf = igmp_mcf_get_first(seq);
2563 if (psf)
2564 while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL)
2565 --pos;
2566 return pos ? NULL : psf;
2567}
2568
2569static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos)
stephen hemminger61fbab72009-11-10 07:54:55 +00002570 __acquires(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002571{
stephen hemminger61fbab72009-11-10 07:54:55 +00002572 rcu_read_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002573 return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
2574}
2575
2576static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2577{
2578 struct ip_sf_list *psf;
2579 if (v == SEQ_START_TOKEN)
2580 psf = igmp_mcf_get_first(seq);
2581 else
2582 psf = igmp_mcf_get_next(seq, v);
2583 ++*pos;
2584 return psf;
2585}
2586
2587static void igmp_mcf_seq_stop(struct seq_file *seq, void *v)
stephen hemminger61fbab72009-11-10 07:54:55 +00002588 __releases(rcu)
Linus Torvalds1da177e2005-04-16 15:20:36 -07002589{
2590 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2591 if (likely(state->im != NULL)) {
2592 spin_unlock_bh(&state->im->lock);
2593 state->im = NULL;
2594 }
Eric Dumazet1d7138d2010-11-12 05:46:50 +00002595 state->idev = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07002596 state->dev = NULL;
stephen hemminger61fbab72009-11-10 07:54:55 +00002597 rcu_read_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07002598}
2599
2600static int igmp_mcf_seq_show(struct seq_file *seq, void *v)
2601{
2602 struct ip_sf_list *psf = (struct ip_sf_list *)v;
2603 struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq);
2604
2605 if (v == SEQ_START_TOKEN) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002606 seq_printf(seq,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002607 "%3s %6s "
2608 "%10s %10s %6s %6s\n", "Idx",
2609 "Device", "MCA",
2610 "SRC", "INC", "EXC");
2611 } else {
2612 seq_printf(seq,
2613 "%3d %6.6s 0x%08x "
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09002614 "0x%08x %6lu %6lu\n",
2615 state->dev->ifindex, state->dev->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002616 ntohl(state->im->multiaddr),
2617 ntohl(psf->sf_inaddr),
2618 psf->sf_count[MCAST_INCLUDE],
2619 psf->sf_count[MCAST_EXCLUDE]);
2620 }
2621 return 0;
2622}
2623
Stephen Hemmingerf6908082007-03-12 14:34:29 -07002624static const struct seq_operations igmp_mcf_seq_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002625 .start = igmp_mcf_seq_start,
2626 .next = igmp_mcf_seq_next,
2627 .stop = igmp_mcf_seq_stop,
2628 .show = igmp_mcf_seq_show,
2629};
2630
2631static int igmp_mcf_seq_open(struct inode *inode, struct file *file)
2632{
Alexey Dobriyan7091e722008-12-25 16:42:51 -08002633 return seq_open_net(inode, file, &igmp_mcf_seq_ops,
Pavel Emelyanovcf7732e2007-10-10 02:29:29 -07002634 sizeof(struct igmp_mcf_iter_state));
Linus Torvalds1da177e2005-04-16 15:20:36 -07002635}
2636
Arjan van de Ven9a321442007-02-12 00:55:35 -08002637static const struct file_operations igmp_mcf_seq_fops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07002638 .owner = THIS_MODULE,
2639 .open = igmp_mcf_seq_open,
2640 .read = seq_read,
2641 .llseek = seq_lseek,
Alexey Dobriyan7091e722008-12-25 16:42:51 -08002642 .release = seq_release_net,
2643};
2644
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00002645static int __net_init igmp_net_init(struct net *net)
Alexey Dobriyan7091e722008-12-25 16:42:51 -08002646{
2647 struct proc_dir_entry *pde;
2648
2649 pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops);
2650 if (!pde)
2651 goto out_igmp;
2652 pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops);
2653 if (!pde)
2654 goto out_mcfilter;
2655 return 0;
2656
2657out_mcfilter:
2658 proc_net_remove(net, "igmp");
2659out_igmp:
2660 return -ENOMEM;
2661}
2662
Alexey Dobriyan2c8c1e72010-01-17 03:35:32 +00002663static void __net_exit igmp_net_exit(struct net *net)
Alexey Dobriyan7091e722008-12-25 16:42:51 -08002664{
2665 proc_net_remove(net, "mcfilter");
2666 proc_net_remove(net, "igmp");
2667}
2668
2669static struct pernet_operations igmp_net_ops = {
2670 .init = igmp_net_init,
2671 .exit = igmp_net_exit,
Linus Torvalds1da177e2005-04-16 15:20:36 -07002672};
2673
2674int __init igmp_mc_proc_init(void)
2675{
Alexey Dobriyan7091e722008-12-25 16:42:51 -08002676 return register_pernet_subsys(&igmp_net_ops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07002677}
2678#endif