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1da177e4 LT |
1 | /* |
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 | * | |
11 | * Version: $Id: igmp.c,v 1.47 2002/02/01 22:01:03 davem Exp $ | |
12 | * | |
13 | * Authors: | |
14 | * Alan Cox <Alan.Cox@linux.org> | |
15 | * | |
16 | * This program is free software; you can redistribute it and/or | |
17 | * modify it under the terms of the GNU General Public License | |
18 | * as published by the Free Software Foundation; either version | |
19 | * 2 of the License, or (at your option) any later version. | |
20 | * | |
21 | * Fixes: | |
22 | * | |
23 | * Alan Cox : Added lots of __inline__ to optimise | |
24 | * the memory usage of all the tiny little | |
25 | * functions. | |
26 | * Alan Cox : Dumped the header building experiment. | |
27 | * Alan Cox : Minor tweaks ready for multicast routing | |
28 | * and extended IGMP protocol. | |
29 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
30 | * writes utterly bogus code otherwise (sigh) | |
31 | * fixed IGMP loopback to behave in the manner | |
32 | * desired by mrouted, fixed the fact it has been | |
33 | * broken since 1.3.6 and cleaned up a few minor | |
34 | * points. | |
35 | * | |
36 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
37 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 38 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
39 | * ipmulti-3.5 source code. |
40 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
41 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
42 | * the mrouted version on that device. | |
43 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
44 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
45 | * to identify the multicast router version | |
46 | * and do what the IGMP version 2 specified. | |
47 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
48 | * Tsu-Sheng Tsao if the specified time expired. | |
49 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
50 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
51 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
52 | * memberships but was being deleted, |
53 | * which caused a "del_timer() called | |
1da177e4 LT |
54 | * from %p with timer not initialized\n" |
55 | * message (960131). | |
e905a9ed | 56 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
57 | * igmp_timer_expire function (960205). |
58 | * Christian Daudt : igmp_heard_report now only calls | |
59 | * igmp_timer_expire if tm->running is | |
60 | * true (960216). | |
61 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
62 | * igmp_heard_query never trigger. Expiry | |
63 | * miscalculation fixed in igmp_heard_query | |
64 | * and random() made to return unsigned to | |
65 | * prevent negative expiry times. | |
66 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
67 | * fix from pending 2.1.x patches. | |
68 | * Alan Cox: Forget to enable FDDI support earlier. | |
69 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
70 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
71 | * David L Stevens: IGMPv3 support, with help from | |
72 | * Vinay Kulkarni | |
73 | */ | |
74 | ||
1da177e4 LT |
75 | #include <linux/module.h> |
76 | #include <asm/uaccess.h> | |
77 | #include <asm/system.h> | |
78 | #include <linux/types.h> | |
79 | #include <linux/kernel.h> | |
80 | #include <linux/jiffies.h> | |
81 | #include <linux/string.h> | |
82 | #include <linux/socket.h> | |
83 | #include <linux/sockios.h> | |
84 | #include <linux/in.h> | |
85 | #include <linux/inet.h> | |
86 | #include <linux/netdevice.h> | |
87 | #include <linux/skbuff.h> | |
88 | #include <linux/inetdevice.h> | |
89 | #include <linux/igmp.h> | |
90 | #include <linux/if_arp.h> | |
91 | #include <linux/rtnetlink.h> | |
92 | #include <linux/times.h> | |
14c85021 ACM |
93 | |
94 | #include <net/arp.h> | |
1da177e4 LT |
95 | #include <net/ip.h> |
96 | #include <net/protocol.h> | |
97 | #include <net/route.h> | |
98 | #include <net/sock.h> | |
99 | #include <net/checksum.h> | |
100 | #include <linux/netfilter_ipv4.h> | |
101 | #ifdef CONFIG_IP_MROUTE | |
102 | #include <linux/mroute.h> | |
103 | #endif | |
104 | #ifdef CONFIG_PROC_FS | |
105 | #include <linux/proc_fs.h> | |
106 | #include <linux/seq_file.h> | |
107 | #endif | |
108 | ||
109 | #define IP_MAX_MEMBERSHIPS 20 | |
110 | #define IP_MAX_MSF 10 | |
111 | ||
112 | #ifdef CONFIG_IP_MULTICAST | |
113 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
114 | ||
115 | #define IGMP_V1_Router_Present_Timeout (400*HZ) | |
116 | #define IGMP_V2_Router_Present_Timeout (400*HZ) | |
117 | #define IGMP_Unsolicited_Report_Interval (10*HZ) | |
118 | #define IGMP_Query_Response_Interval (10*HZ) | |
119 | #define IGMP_Unsolicited_Report_Count 2 | |
120 | ||
121 | ||
122 | #define IGMP_Initial_Report_Delay (1) | |
123 | ||
124 | /* IGMP_Initial_Report_Delay is not from IGMP specs! | |
125 | * IGMP specs require to report membership immediately after | |
126 | * joining a group, but we delay the first report by a | |
127 | * small interval. It seems more natural and still does not | |
128 | * contradict to specs provided this delay is small enough. | |
129 | */ | |
130 | ||
131 | #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \ | |
132 | (in_dev)->cnf.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) (ipv4_devconf.force_igmp_version == 2 || \ | |
136 | (in_dev)->cnf.force_igmp_version == 2 || \ | |
137 | ((in_dev)->mr_v2_seen && \ | |
138 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
139 | ||
140 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); | |
63007727 | 141 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); |
1da177e4 LT |
142 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
143 | static int sf_setstate(struct ip_mc_list *pmc); | |
144 | static void sf_markstate(struct ip_mc_list *pmc); | |
145 | #endif | |
146 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
147 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
148 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
149 | |
150 | static void ip_ma_put(struct ip_mc_list *im) | |
151 | { | |
152 | if (atomic_dec_and_test(&im->refcnt)) { | |
153 | in_dev_put(im->interface); | |
154 | kfree(im); | |
155 | } | |
156 | } | |
157 | ||
158 | #ifdef CONFIG_IP_MULTICAST | |
159 | ||
160 | /* | |
161 | * Timer management | |
162 | */ | |
163 | ||
164 | static __inline__ void igmp_stop_timer(struct ip_mc_list *im) | |
165 | { | |
166 | spin_lock_bh(&im->lock); | |
167 | if (del_timer(&im->timer)) | |
168 | atomic_dec(&im->refcnt); | |
169 | im->tm_running=0; | |
170 | im->reporter = 0; | |
171 | im->unsolicit_count = 0; | |
172 | spin_unlock_bh(&im->lock); | |
173 | } | |
174 | ||
175 | /* It must be called with locked im->lock */ | |
176 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
177 | { | |
178 | int tv=net_random() % max_delay; | |
179 | ||
180 | im->tm_running=1; | |
181 | if (!mod_timer(&im->timer, jiffies+tv+2)) | |
182 | atomic_inc(&im->refcnt); | |
183 | } | |
184 | ||
185 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
186 | { | |
187 | int tv = net_random() % in_dev->mr_maxdelay; | |
188 | ||
189 | in_dev->mr_gq_running = 1; | |
190 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
191 | in_dev_hold(in_dev); | |
192 | } | |
193 | ||
194 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
195 | { | |
196 | int tv = net_random() % delay; | |
197 | ||
198 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
199 | in_dev_hold(in_dev); | |
200 | } | |
201 | ||
202 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
203 | { | |
204 | spin_lock_bh(&im->lock); | |
205 | im->unsolicit_count = 0; | |
206 | if (del_timer(&im->timer)) { | |
207 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
208 | add_timer(&im->timer); | |
209 | im->tm_running=1; | |
210 | spin_unlock_bh(&im->lock); | |
211 | return; | |
212 | } | |
213 | atomic_dec(&im->refcnt); | |
214 | } | |
215 | igmp_start_timer(im, max_delay); | |
216 | spin_unlock_bh(&im->lock); | |
217 | } | |
218 | ||
219 | ||
220 | /* | |
221 | * Send an IGMP report. | |
222 | */ | |
223 | ||
224 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
225 | ||
226 | ||
227 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
228 | int gdeleted, int sdeleted) | |
229 | { | |
230 | switch (type) { | |
231 | case IGMPV3_MODE_IS_INCLUDE: | |
232 | case IGMPV3_MODE_IS_EXCLUDE: | |
233 | if (gdeleted || sdeleted) | |
234 | return 0; | |
ad12583f DS |
235 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
236 | if (pmc->sfmode == MCAST_INCLUDE) | |
237 | return 1; | |
238 | /* don't include if this source is excluded | |
239 | * in all filters | |
240 | */ | |
241 | if (psf->sf_count[MCAST_INCLUDE]) | |
242 | return type == IGMPV3_MODE_IS_INCLUDE; | |
243 | return pmc->sfcount[MCAST_EXCLUDE] == | |
244 | psf->sf_count[MCAST_EXCLUDE]; | |
245 | } | |
246 | return 0; | |
1da177e4 LT |
247 | case IGMPV3_CHANGE_TO_INCLUDE: |
248 | if (gdeleted || sdeleted) | |
249 | return 0; | |
250 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
251 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
252 | if (gdeleted || sdeleted) | |
253 | return 0; | |
254 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
255 | psf->sf_count[MCAST_INCLUDE]) | |
256 | return 0; | |
257 | return pmc->sfcount[MCAST_EXCLUDE] == | |
258 | psf->sf_count[MCAST_EXCLUDE]; | |
259 | case IGMPV3_ALLOW_NEW_SOURCES: | |
260 | if (gdeleted || !psf->sf_crcount) | |
261 | return 0; | |
262 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
263 | case IGMPV3_BLOCK_OLD_SOURCES: | |
264 | if (pmc->sfmode == MCAST_INCLUDE) | |
265 | return gdeleted || (psf->sf_crcount && sdeleted); | |
266 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
267 | } | |
268 | return 0; | |
269 | } | |
270 | ||
271 | static int | |
272 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
273 | { | |
274 | struct ip_sf_list *psf; | |
275 | int scount = 0; | |
276 | ||
277 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
278 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) | |
279 | continue; | |
280 | scount++; | |
281 | } | |
282 | return scount; | |
283 | } | |
284 | ||
285 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) | |
286 | { | |
287 | struct sk_buff *skb; | |
288 | struct rtable *rt; | |
289 | struct iphdr *pip; | |
290 | struct igmpv3_report *pig; | |
291 | ||
292 | skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); | |
293 | if (skb == NULL) | |
294 | return NULL; | |
295 | ||
296 | { | |
297 | struct flowi fl = { .oif = dev->ifindex, | |
298 | .nl_u = { .ip4_u = { | |
299 | .daddr = IGMPV3_ALL_MCR } }, | |
300 | .proto = IPPROTO_IGMP }; | |
301 | if (ip_route_output_key(&rt, &fl)) { | |
302 | kfree_skb(skb); | |
303 | return NULL; | |
304 | } | |
305 | } | |
306 | if (rt->rt_src == 0) { | |
307 | kfree_skb(skb); | |
308 | ip_rt_put(rt); | |
309 | return NULL; | |
310 | } | |
311 | ||
312 | skb->dst = &rt->u.dst; | |
313 | skb->dev = dev; | |
314 | ||
315 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
316 | ||
7e28ecc2 | 317 | skb_reset_network_header(skb); |
eddc9ec5 | 318 | pip = ip_hdr(skb); |
7e28ecc2 | 319 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
320 | |
321 | pip->version = 4; | |
322 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
323 | pip->tos = 0xc0; | |
324 | pip->frag_off = htons(IP_DF); | |
325 | pip->ttl = 1; | |
326 | pip->daddr = rt->rt_dst; | |
327 | pip->saddr = rt->rt_src; | |
328 | pip->protocol = IPPROTO_IGMP; | |
329 | pip->tot_len = 0; /* filled in later */ | |
330 | ip_select_ident(pip, &rt->u.dst, NULL); | |
331 | ((u8*)&pip[1])[0] = IPOPT_RA; | |
332 | ((u8*)&pip[1])[1] = 4; | |
333 | ((u8*)&pip[1])[2] = 0; | |
334 | ((u8*)&pip[1])[3] = 0; | |
335 | ||
b0e380b1 | 336 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 337 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 338 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
339 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
340 | pig->resv1 = 0; | |
341 | pig->csum = 0; | |
342 | pig->resv2 = 0; | |
343 | pig->ngrec = 0; | |
344 | return skb; | |
345 | } | |
346 | ||
347 | static int igmpv3_sendpack(struct sk_buff *skb) | |
348 | { | |
eddc9ec5 | 349 | struct iphdr *pip = ip_hdr(skb); |
d9edf9e2 | 350 | struct igmphdr *pig = igmp_hdr(skb); |
27a884dc ACM |
351 | const int iplen = skb->tail - skb->network_header; |
352 | const int igmplen = skb->tail - skb->transport_header; | |
1da177e4 | 353 | |
1da177e4 LT |
354 | pip->tot_len = htons(iplen); |
355 | ip_send_check(pip); | |
d9edf9e2 | 356 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 LT |
357 | |
358 | return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev, | |
359 | dst_output); | |
360 | } | |
361 | ||
362 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
363 | { | |
364 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); | |
365 | } | |
366 | ||
367 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
368 | int type, struct igmpv3_grec **ppgr) | |
369 | { | |
370 | struct net_device *dev = pmc->interface->dev; | |
371 | struct igmpv3_report *pih; | |
372 | struct igmpv3_grec *pgr; | |
373 | ||
374 | if (!skb) | |
375 | skb = igmpv3_newpack(dev, dev->mtu); | |
376 | if (!skb) | |
377 | return NULL; | |
378 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
379 | pgr->grec_type = type; | |
380 | pgr->grec_auxwords = 0; | |
381 | pgr->grec_nsrcs = 0; | |
382 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 383 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
384 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
385 | *ppgr = pgr; | |
386 | return skb; | |
387 | } | |
388 | ||
389 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ | |
390 | skb_tailroom(skb)) : 0) | |
391 | ||
392 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
393 | int type, int gdeleted, int sdeleted) | |
394 | { | |
395 | struct net_device *dev = pmc->interface->dev; | |
396 | struct igmpv3_report *pih; | |
397 | struct igmpv3_grec *pgr = NULL; | |
398 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 399 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
400 | |
401 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
402 | return skb; | |
403 | ||
404 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
405 | type == IGMPV3_MODE_IS_EXCLUDE; | |
406 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
407 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
408 | ||
ad12583f DS |
409 | stotal = scount = 0; |
410 | ||
1da177e4 LT |
411 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
412 | ||
ad12583f DS |
413 | if (!*psf_list) |
414 | goto empty_source; | |
415 | ||
d9edf9e2 | 416 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
417 | |
418 | /* EX and TO_EX get a fresh packet, if needed */ | |
419 | if (truncate) { | |
420 | if (pih && pih->ngrec && | |
421 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
422 | if (skb) | |
423 | igmpv3_sendpack(skb); | |
424 | skb = igmpv3_newpack(dev, dev->mtu); | |
425 | } | |
426 | } | |
427 | first = 1; | |
1da177e4 LT |
428 | psf_prev = NULL; |
429 | for (psf=*psf_list; psf; psf=psf_next) { | |
ea4d9e72 | 430 | __be32 *psrc; |
1da177e4 LT |
431 | |
432 | psf_next = psf->sf_next; | |
433 | ||
434 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
435 | psf_prev = psf; | |
436 | continue; | |
437 | } | |
438 | ||
439 | /* clear marks on query responses */ | |
440 | if (isquery) | |
441 | psf->sf_gsresp = 0; | |
442 | ||
63007727 | 443 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
444 | first*sizeof(struct igmpv3_grec)) { |
445 | if (truncate && !first) | |
446 | break; /* truncate these */ | |
447 | if (pgr) | |
448 | pgr->grec_nsrcs = htons(scount); | |
449 | if (skb) | |
450 | igmpv3_sendpack(skb); | |
451 | skb = igmpv3_newpack(dev, dev->mtu); | |
452 | first = 1; | |
453 | scount = 0; | |
454 | } | |
455 | if (first) { | |
456 | skb = add_grhead(skb, pmc, type, &pgr); | |
457 | first = 0; | |
458 | } | |
cc63f70b AD |
459 | if (!skb) |
460 | return NULL; | |
63007727 | 461 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 462 | *psrc = psf->sf_inaddr; |
ad12583f | 463 | scount++; stotal++; |
1da177e4 LT |
464 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
465 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
466 | psf->sf_crcount--; | |
467 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
468 | if (psf_prev) | |
469 | psf_prev->sf_next = psf->sf_next; | |
470 | else | |
471 | *psf_list = psf->sf_next; | |
472 | kfree(psf); | |
473 | continue; | |
474 | } | |
475 | } | |
476 | psf_prev = psf; | |
477 | } | |
ad12583f DS |
478 | |
479 | empty_source: | |
480 | if (!stotal) { | |
481 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
482 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
483 | return skb; | |
484 | if (pmc->crcount || isquery) { | |
485 | /* make sure we have room for group header */ | |
486 | if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { | |
487 | igmpv3_sendpack(skb); | |
488 | skb = NULL; /* add_grhead will get a new one */ | |
489 | } | |
490 | skb = add_grhead(skb, pmc, type, &pgr); | |
491 | } | |
492 | } | |
1da177e4 LT |
493 | if (pgr) |
494 | pgr->grec_nsrcs = htons(scount); | |
495 | ||
496 | if (isquery) | |
497 | pmc->gsquery = 0; /* clear query state on report */ | |
498 | return skb; | |
499 | } | |
500 | ||
501 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
502 | { | |
503 | struct sk_buff *skb = NULL; | |
504 | int type; | |
505 | ||
506 | if (!pmc) { | |
507 | read_lock(&in_dev->mc_list_lock); | |
508 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
509 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
510 | continue; | |
511 | spin_lock_bh(&pmc->lock); | |
512 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
513 | type = IGMPV3_MODE_IS_EXCLUDE; | |
514 | else | |
515 | type = IGMPV3_MODE_IS_INCLUDE; | |
516 | skb = add_grec(skb, pmc, type, 0, 0); | |
517 | spin_unlock_bh(&pmc->lock); | |
518 | } | |
519 | read_unlock(&in_dev->mc_list_lock); | |
520 | } else { | |
521 | spin_lock_bh(&pmc->lock); | |
522 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
523 | type = IGMPV3_MODE_IS_EXCLUDE; | |
524 | else | |
525 | type = IGMPV3_MODE_IS_INCLUDE; | |
526 | skb = add_grec(skb, pmc, type, 0, 0); | |
527 | spin_unlock_bh(&pmc->lock); | |
528 | } | |
529 | if (!skb) | |
530 | return 0; | |
531 | return igmpv3_sendpack(skb); | |
532 | } | |
533 | ||
534 | /* | |
535 | * remove zero-count source records from a source filter list | |
536 | */ | |
537 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
538 | { | |
539 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
540 | ||
541 | psf_prev = NULL; | |
542 | for (psf=*ppsf; psf; psf = psf_next) { | |
543 | psf_next = psf->sf_next; | |
544 | if (psf->sf_crcount == 0) { | |
545 | if (psf_prev) | |
546 | psf_prev->sf_next = psf->sf_next; | |
547 | else | |
548 | *ppsf = psf->sf_next; | |
549 | kfree(psf); | |
550 | } else | |
551 | psf_prev = psf; | |
552 | } | |
553 | } | |
554 | ||
555 | static void igmpv3_send_cr(struct in_device *in_dev) | |
556 | { | |
557 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
558 | struct sk_buff *skb = NULL; | |
559 | int type, dtype; | |
560 | ||
561 | read_lock(&in_dev->mc_list_lock); | |
562 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
563 | ||
564 | /* deleted MCA's */ | |
565 | pmc_prev = NULL; | |
566 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { | |
567 | pmc_next = pmc->next; | |
568 | if (pmc->sfmode == MCAST_INCLUDE) { | |
569 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
570 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
571 | skb = add_grec(skb, pmc, type, 1, 0); | |
572 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
573 | } | |
574 | if (pmc->crcount) { | |
1da177e4 LT |
575 | if (pmc->sfmode == MCAST_EXCLUDE) { |
576 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
577 | skb = add_grec(skb, pmc, type, 1, 0); | |
578 | } | |
ad12583f | 579 | pmc->crcount--; |
1da177e4 LT |
580 | if (pmc->crcount == 0) { |
581 | igmpv3_clear_zeros(&pmc->tomb); | |
582 | igmpv3_clear_zeros(&pmc->sources); | |
583 | } | |
584 | } | |
585 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
586 | if (pmc_prev) | |
587 | pmc_prev->next = pmc_next; | |
588 | else | |
589 | in_dev->mc_tomb = pmc_next; | |
590 | in_dev_put(pmc->interface); | |
591 | kfree(pmc); | |
592 | } else | |
593 | pmc_prev = pmc; | |
594 | } | |
595 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
596 | ||
597 | /* change recs */ | |
598 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
599 | spin_lock_bh(&pmc->lock); | |
600 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
601 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
602 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
603 | } else { | |
604 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
605 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
606 | } | |
607 | skb = add_grec(skb, pmc, type, 0, 0); | |
608 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
609 | ||
610 | /* filter mode changes */ | |
611 | if (pmc->crcount) { | |
1da177e4 LT |
612 | if (pmc->sfmode == MCAST_EXCLUDE) |
613 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
614 | else | |
615 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
616 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 617 | pmc->crcount--; |
1da177e4 LT |
618 | } |
619 | spin_unlock_bh(&pmc->lock); | |
620 | } | |
621 | read_unlock(&in_dev->mc_list_lock); | |
622 | ||
623 | if (!skb) | |
624 | return; | |
625 | (void) igmpv3_sendpack(skb); | |
626 | } | |
627 | ||
628 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
629 | int type) | |
630 | { | |
631 | struct sk_buff *skb; | |
632 | struct iphdr *iph; | |
633 | struct igmphdr *ih; | |
634 | struct rtable *rt; | |
635 | struct net_device *dev = in_dev->dev; | |
63007727 AV |
636 | __be32 group = pmc ? pmc->multiaddr : 0; |
637 | __be32 dst; | |
1da177e4 LT |
638 | |
639 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
640 | return igmpv3_send_report(in_dev, pmc); | |
641 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
642 | dst = IGMP_ALL_ROUTER; | |
643 | else | |
644 | dst = group; | |
645 | ||
646 | { | |
647 | struct flowi fl = { .oif = dev->ifindex, | |
648 | .nl_u = { .ip4_u = { .daddr = dst } }, | |
649 | .proto = IPPROTO_IGMP }; | |
650 | if (ip_route_output_key(&rt, &fl)) | |
651 | return -1; | |
652 | } | |
653 | if (rt->rt_src == 0) { | |
654 | ip_rt_put(rt); | |
655 | return -1; | |
656 | } | |
657 | ||
658 | skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); | |
659 | if (skb == NULL) { | |
660 | ip_rt_put(rt); | |
661 | return -1; | |
662 | } | |
663 | ||
664 | skb->dst = &rt->u.dst; | |
665 | ||
666 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
667 | ||
7e28ecc2 | 668 | skb_reset_network_header(skb); |
eddc9ec5 | 669 | iph = ip_hdr(skb); |
7e28ecc2 | 670 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
671 | |
672 | iph->version = 4; | |
673 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
674 | iph->tos = 0xc0; | |
675 | iph->frag_off = htons(IP_DF); | |
676 | iph->ttl = 1; | |
677 | iph->daddr = dst; | |
678 | iph->saddr = rt->rt_src; | |
679 | iph->protocol = IPPROTO_IGMP; | |
680 | iph->tot_len = htons(IGMP_SIZE); | |
681 | ip_select_ident(iph, &rt->u.dst, NULL); | |
682 | ((u8*)&iph[1])[0] = IPOPT_RA; | |
683 | ((u8*)&iph[1])[1] = 4; | |
684 | ((u8*)&iph[1])[2] = 0; | |
685 | ((u8*)&iph[1])[3] = 0; | |
686 | ip_send_check(iph); | |
687 | ||
688 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
689 | ih->type=type; | |
690 | ih->code=0; | |
691 | ih->csum=0; | |
692 | ih->group=group; | |
693 | ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
694 | ||
695 | return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, | |
696 | dst_output); | |
697 | } | |
698 | ||
699 | static void igmp_gq_timer_expire(unsigned long data) | |
700 | { | |
701 | struct in_device *in_dev = (struct in_device *)data; | |
702 | ||
703 | in_dev->mr_gq_running = 0; | |
704 | igmpv3_send_report(in_dev, NULL); | |
705 | __in_dev_put(in_dev); | |
706 | } | |
707 | ||
708 | static void igmp_ifc_timer_expire(unsigned long data) | |
709 | { | |
710 | struct in_device *in_dev = (struct in_device *)data; | |
711 | ||
712 | igmpv3_send_cr(in_dev); | |
713 | if (in_dev->mr_ifc_count) { | |
714 | in_dev->mr_ifc_count--; | |
715 | igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); | |
716 | } | |
717 | __in_dev_put(in_dev); | |
718 | } | |
719 | ||
720 | static void igmp_ifc_event(struct in_device *in_dev) | |
721 | { | |
722 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
723 | return; | |
e905a9ed | 724 | in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
725 | IGMP_Unsolicited_Report_Count; |
726 | igmp_ifc_start_timer(in_dev, 1); | |
727 | } | |
728 | ||
729 | ||
730 | static void igmp_timer_expire(unsigned long data) | |
731 | { | |
732 | struct ip_mc_list *im=(struct ip_mc_list *)data; | |
733 | struct in_device *in_dev = im->interface; | |
734 | ||
735 | spin_lock(&im->lock); | |
736 | im->tm_running=0; | |
737 | ||
738 | if (im->unsolicit_count) { | |
739 | im->unsolicit_count--; | |
740 | igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); | |
741 | } | |
742 | im->reporter = 1; | |
743 | spin_unlock(&im->lock); | |
744 | ||
745 | if (IGMP_V1_SEEN(in_dev)) | |
746 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
747 | else if (IGMP_V2_SEEN(in_dev)) | |
748 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
749 | else | |
750 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
751 | ||
752 | ip_ma_put(im); | |
753 | } | |
754 | ||
ad12583f | 755 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 756 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
757 | { |
758 | struct ip_sf_list *psf; | |
759 | int i, scount; | |
760 | ||
ad12583f DS |
761 | scount = 0; |
762 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
763 | if (scount == nsrcs) | |
764 | break; | |
765 | for (i=0; i<nsrcs; i++) { | |
766 | /* skip inactive filters */ | |
767 | if (pmc->sfcount[MCAST_INCLUDE] || | |
768 | pmc->sfcount[MCAST_EXCLUDE] != | |
769 | psf->sf_count[MCAST_EXCLUDE]) | |
770 | continue; | |
771 | if (srcs[i] == psf->sf_inaddr) { | |
772 | scount++; | |
773 | break; | |
774 | } | |
775 | } | |
776 | } | |
777 | pmc->gsquery = 0; | |
778 | if (scount == nsrcs) /* all sources excluded */ | |
779 | return 0; | |
780 | return 1; | |
781 | } | |
782 | ||
ea4d9e72 | 783 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
784 | { |
785 | struct ip_sf_list *psf; | |
786 | int i, scount; | |
787 | ||
788 | if (pmc->sfmode == MCAST_EXCLUDE) | |
789 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
790 | ||
791 | /* mark INCLUDE-mode sources */ | |
1da177e4 LT |
792 | scount = 0; |
793 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
794 | if (scount == nsrcs) | |
795 | break; | |
796 | for (i=0; i<nsrcs; i++) | |
797 | if (srcs[i] == psf->sf_inaddr) { | |
798 | psf->sf_gsresp = 1; | |
799 | scount++; | |
800 | break; | |
801 | } | |
802 | } | |
ad12583f DS |
803 | if (!scount) { |
804 | pmc->gsquery = 0; | |
805 | return 0; | |
806 | } | |
807 | pmc->gsquery = 1; | |
808 | return 1; | |
1da177e4 LT |
809 | } |
810 | ||
63007727 | 811 | static void igmp_heard_report(struct in_device *in_dev, __be32 group) |
1da177e4 LT |
812 | { |
813 | struct ip_mc_list *im; | |
814 | ||
815 | /* Timers are only set for non-local groups */ | |
816 | ||
817 | if (group == IGMP_ALL_HOSTS) | |
818 | return; | |
819 | ||
820 | read_lock(&in_dev->mc_list_lock); | |
821 | for (im=in_dev->mc_list; im!=NULL; im=im->next) { | |
822 | if (im->multiaddr == group) { | |
823 | igmp_stop_timer(im); | |
824 | break; | |
825 | } | |
826 | } | |
827 | read_unlock(&in_dev->mc_list_lock); | |
828 | } | |
829 | ||
830 | static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
831 | int len) | |
832 | { | |
d9edf9e2 ACM |
833 | struct igmphdr *ih = igmp_hdr(skb); |
834 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 835 | struct ip_mc_list *im; |
63007727 | 836 | __be32 group = ih->group; |
1da177e4 LT |
837 | int max_delay; |
838 | int mark = 0; | |
839 | ||
840 | ||
841 | if (len == 8) { | |
842 | if (ih->code == 0) { | |
843 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 844 | |
1da177e4 LT |
845 | max_delay = IGMP_Query_Response_Interval; |
846 | in_dev->mr_v1_seen = jiffies + | |
847 | IGMP_V1_Router_Present_Timeout; | |
848 | group = 0; | |
849 | } else { | |
850 | /* v2 router present */ | |
851 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
852 | in_dev->mr_v2_seen = jiffies + | |
853 | IGMP_V2_Router_Present_Timeout; | |
854 | } | |
855 | /* cancel the interface change timer */ | |
856 | in_dev->mr_ifc_count = 0; | |
857 | if (del_timer(&in_dev->mr_ifc_timer)) | |
858 | __in_dev_put(in_dev); | |
859 | /* clear deleted report items */ | |
860 | igmpv3_clear_delrec(in_dev); | |
861 | } else if (len < 12) { | |
862 | return; /* ignore bogus packet; freed by caller */ | |
863 | } else { /* v3 */ | |
864 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
865 | return; | |
e905a9ed | 866 | |
d9edf9e2 | 867 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 868 | if (ih3->nsrcs) { |
e905a9ed | 869 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 870 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
1da177e4 | 871 | return; |
d9edf9e2 | 872 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
873 | } |
874 | ||
875 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
876 | if (!max_delay) | |
877 | max_delay = 1; /* can't mod w/ 0 */ | |
878 | in_dev->mr_maxdelay = max_delay; | |
879 | if (ih3->qrv) | |
880 | in_dev->mr_qrv = ih3->qrv; | |
881 | if (!group) { /* general query */ | |
882 | if (ih3->nsrcs) | |
883 | return; /* no sources allowed */ | |
884 | igmp_gq_start_timer(in_dev); | |
885 | return; | |
886 | } | |
887 | /* mark sources to include, if group & source-specific */ | |
888 | mark = ih3->nsrcs != 0; | |
889 | } | |
890 | ||
891 | /* | |
892 | * - Start the timers in all of our membership records | |
893 | * that the query applies to for the interface on | |
894 | * which the query arrived excl. those that belong | |
895 | * to a "local" group (224.0.0.X) | |
896 | * - For timers already running check if they need to | |
897 | * be reset. | |
898 | * - Use the igmp->igmp_code field as the maximum | |
899 | * delay possible | |
900 | */ | |
901 | read_lock(&in_dev->mc_list_lock); | |
902 | for (im=in_dev->mc_list; im!=NULL; im=im->next) { | |
ad12583f DS |
903 | int changed; |
904 | ||
1da177e4 LT |
905 | if (group && group != im->multiaddr) |
906 | continue; | |
907 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
908 | continue; | |
909 | spin_lock_bh(&im->lock); | |
910 | if (im->tm_running) | |
911 | im->gsquery = im->gsquery && mark; | |
912 | else | |
913 | im->gsquery = mark; | |
ad12583f | 914 | changed = !im->gsquery || |
e905a9ed | 915 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 916 | spin_unlock_bh(&im->lock); |
ad12583f DS |
917 | if (changed) |
918 | igmp_mod_timer(im, max_delay); | |
1da177e4 LT |
919 | } |
920 | read_unlock(&in_dev->mc_list_lock); | |
921 | } | |
922 | ||
923 | int igmp_rcv(struct sk_buff *skb) | |
924 | { | |
925 | /* This basically follows the spec line by line -- see RFC1112 */ | |
926 | struct igmphdr *ih; | |
927 | struct in_device *in_dev = in_dev_get(skb->dev); | |
928 | int len = skb->len; | |
929 | ||
930 | if (in_dev==NULL) { | |
931 | kfree_skb(skb); | |
932 | return 0; | |
933 | } | |
934 | ||
fb286bb2 HX |
935 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
936 | goto drop; | |
937 | ||
938 | switch (skb->ip_summed) { | |
84fa7933 | 939 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 940 | if (!csum_fold(skb->csum)) |
fb286bb2 HX |
941 | break; |
942 | /* fall through */ | |
943 | case CHECKSUM_NONE: | |
944 | skb->csum = 0; | |
945 | if (__skb_checksum_complete(skb)) | |
946 | goto drop; | |
1da177e4 LT |
947 | } |
948 | ||
d9edf9e2 | 949 | ih = igmp_hdr(skb); |
1da177e4 LT |
950 | switch (ih->type) { |
951 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
952 | igmp_heard_query(in_dev, skb, len); | |
953 | break; | |
954 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
955 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
956 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
957 | /* Is it our report looped back? */ | |
958 | if (((struct rtable*)skb->dst)->fl.iif == 0) | |
959 | break; | |
24c69275 DS |
960 | /* don't rely on MC router hearing unicast reports */ |
961 | if (skb->pkt_type == PACKET_MULTICAST || | |
962 | skb->pkt_type == PACKET_BROADCAST) | |
963 | igmp_heard_report(in_dev, ih->group); | |
1da177e4 LT |
964 | break; |
965 | case IGMP_PIM: | |
966 | #ifdef CONFIG_IP_PIMSM_V1 | |
967 | in_dev_put(in_dev); | |
968 | return pim_rcv_v1(skb); | |
969 | #endif | |
970 | case IGMP_DVMRP: | |
971 | case IGMP_TRACE: | |
972 | case IGMP_HOST_LEAVE_MESSAGE: | |
973 | case IGMP_MTRACE: | |
974 | case IGMP_MTRACE_RESP: | |
975 | break; | |
976 | default: | |
dd1c1853 | 977 | break; |
1da177e4 | 978 | } |
fb286bb2 HX |
979 | |
980 | drop: | |
1da177e4 LT |
981 | in_dev_put(in_dev); |
982 | kfree_skb(skb); | |
983 | return 0; | |
984 | } | |
985 | ||
986 | #endif | |
987 | ||
988 | ||
989 | /* | |
990 | * Add a filter to a device | |
991 | */ | |
992 | ||
63007727 | 993 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
994 | { |
995 | char buf[MAX_ADDR_LEN]; | |
996 | struct net_device *dev = in_dev->dev; | |
997 | ||
998 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
999 | We will get multicast token leakage, when IFF_MULTICAST | |
1000 | is changed. This check should be done in dev->set_multicast_list | |
1001 | routine. Something sort of: | |
1002 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1003 | --ANK | |
1004 | */ | |
1005 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
1006 | dev_mc_add(dev,buf,dev->addr_len,0); | |
1007 | } | |
1008 | ||
1009 | /* | |
1010 | * Remove a filter from a device | |
1011 | */ | |
1012 | ||
63007727 | 1013 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1014 | { |
1015 | char buf[MAX_ADDR_LEN]; | |
1016 | struct net_device *dev = in_dev->dev; | |
1017 | ||
1018 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
1019 | dev_mc_delete(dev,buf,dev->addr_len,0); | |
1020 | } | |
1021 | ||
1022 | #ifdef CONFIG_IP_MULTICAST | |
1023 | /* | |
1024 | * deleted ip_mc_list manipulation | |
1025 | */ | |
1026 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1027 | { | |
1028 | struct ip_mc_list *pmc; | |
1029 | ||
1030 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1031 | * are actually used. In particular, the refcnt and users are not | |
1032 | * used for management of the delete list. Using the same structure | |
1033 | * for deleted items allows change reports to use common code with | |
1034 | * non-deleted or query-response MCA's. | |
1035 | */ | |
0da974f4 | 1036 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1037 | if (!pmc) |
1038 | return; | |
1da177e4 LT |
1039 | spin_lock_bh(&im->lock); |
1040 | pmc->interface = im->interface; | |
1041 | in_dev_hold(in_dev); | |
1042 | pmc->multiaddr = im->multiaddr; | |
1043 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1044 | IGMP_Unsolicited_Report_Count; | |
1045 | pmc->sfmode = im->sfmode; | |
1046 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1047 | struct ip_sf_list *psf; | |
1048 | ||
1049 | pmc->tomb = im->tomb; | |
1050 | pmc->sources = im->sources; | |
1051 | im->tomb = im->sources = NULL; | |
1052 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1053 | psf->sf_crcount = pmc->crcount; | |
1054 | } | |
1055 | spin_unlock_bh(&im->lock); | |
1056 | ||
1057 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1058 | pmc->next = in_dev->mc_tomb; | |
1059 | in_dev->mc_tomb = pmc; | |
1060 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1061 | } | |
1062 | ||
63007727 | 1063 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1064 | { |
1065 | struct ip_mc_list *pmc, *pmc_prev; | |
1066 | struct ip_sf_list *psf, *psf_next; | |
1067 | ||
1068 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1069 | pmc_prev = NULL; | |
1070 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { | |
1071 | if (pmc->multiaddr == multiaddr) | |
1072 | break; | |
1073 | pmc_prev = pmc; | |
1074 | } | |
1075 | if (pmc) { | |
1076 | if (pmc_prev) | |
1077 | pmc_prev->next = pmc->next; | |
1078 | else | |
1079 | in_dev->mc_tomb = pmc->next; | |
1080 | } | |
1081 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1082 | if (pmc) { | |
1083 | for (psf=pmc->tomb; psf; psf=psf_next) { | |
1084 | psf_next = psf->sf_next; | |
1085 | kfree(psf); | |
1086 | } | |
1087 | in_dev_put(pmc->interface); | |
1088 | kfree(pmc); | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1093 | { | |
1094 | struct ip_mc_list *pmc, *nextpmc; | |
1095 | ||
1096 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1097 | pmc = in_dev->mc_tomb; | |
1098 | in_dev->mc_tomb = NULL; | |
1099 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1100 | ||
1101 | for (; pmc; pmc = nextpmc) { | |
1102 | nextpmc = pmc->next; | |
1103 | ip_mc_clear_src(pmc); | |
1104 | in_dev_put(pmc->interface); | |
1105 | kfree(pmc); | |
1106 | } | |
1107 | /* clear dead sources, too */ | |
1108 | read_lock(&in_dev->mc_list_lock); | |
1109 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1110 | struct ip_sf_list *psf, *psf_next; | |
1111 | ||
1112 | spin_lock_bh(&pmc->lock); | |
1113 | psf = pmc->tomb; | |
1114 | pmc->tomb = NULL; | |
1115 | spin_unlock_bh(&pmc->lock); | |
1116 | for (; psf; psf=psf_next) { | |
1117 | psf_next = psf->sf_next; | |
1118 | kfree(psf); | |
1119 | } | |
1120 | } | |
1121 | read_unlock(&in_dev->mc_list_lock); | |
1122 | } | |
1123 | #endif | |
1124 | ||
1125 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1126 | { | |
1127 | struct in_device *in_dev = im->interface; | |
1128 | #ifdef CONFIG_IP_MULTICAST | |
1129 | int reporter; | |
1130 | #endif | |
1131 | ||
1132 | if (im->loaded) { | |
1133 | im->loaded = 0; | |
1134 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1135 | } | |
1136 | ||
1137 | #ifdef CONFIG_IP_MULTICAST | |
1138 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1139 | return; | |
1140 | ||
1141 | reporter = im->reporter; | |
1142 | igmp_stop_timer(im); | |
1143 | ||
1144 | if (!in_dev->dead) { | |
1145 | if (IGMP_V1_SEEN(in_dev)) | |
1146 | goto done; | |
1147 | if (IGMP_V2_SEEN(in_dev)) { | |
1148 | if (reporter) | |
1149 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
1150 | goto done; | |
1151 | } | |
1152 | /* IGMPv3 */ | |
1153 | igmpv3_add_delrec(in_dev, im); | |
1154 | ||
1155 | igmp_ifc_event(in_dev); | |
1156 | } | |
1157 | done: | |
1158 | #endif | |
1159 | ip_mc_clear_src(im); | |
1160 | } | |
1161 | ||
1162 | static void igmp_group_added(struct ip_mc_list *im) | |
1163 | { | |
1164 | struct in_device *in_dev = im->interface; | |
1165 | ||
1166 | if (im->loaded == 0) { | |
1167 | im->loaded = 1; | |
1168 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1169 | } | |
1170 | ||
1171 | #ifdef CONFIG_IP_MULTICAST | |
1172 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1173 | return; | |
1174 | ||
1175 | if (in_dev->dead) | |
1176 | return; | |
1177 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1178 | spin_lock_bh(&im->lock); | |
1179 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1180 | spin_unlock_bh(&im->lock); | |
1181 | return; | |
1182 | } | |
1183 | /* else, v3 */ | |
1184 | ||
1185 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1186 | IGMP_Unsolicited_Report_Count; | |
1187 | igmp_ifc_event(in_dev); | |
1188 | #endif | |
1189 | } | |
1190 | ||
1191 | ||
1192 | /* | |
1193 | * Multicast list managers | |
1194 | */ | |
1195 | ||
1196 | ||
1197 | /* | |
1198 | * A socket has joined a multicast group on device dev. | |
1199 | */ | |
1200 | ||
8f935bbd | 1201 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1202 | { |
1203 | struct ip_mc_list *im; | |
1204 | ||
1205 | ASSERT_RTNL(); | |
1206 | ||
1207 | for (im=in_dev->mc_list; im; im=im->next) { | |
1208 | if (im->multiaddr == addr) { | |
1209 | im->users++; | |
1210 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1211 | goto out; | |
1212 | } | |
1213 | } | |
1214 | ||
8b3a7005 | 1215 | im = kmalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1216 | if (!im) |
1217 | goto out; | |
1218 | ||
1219 | im->users=1; | |
1220 | im->interface=in_dev; | |
1221 | in_dev_hold(in_dev); | |
1222 | im->multiaddr=addr; | |
1223 | /* initial mode is (EX, empty) */ | |
1224 | im->sfmode = MCAST_EXCLUDE; | |
1225 | im->sfcount[MCAST_INCLUDE] = 0; | |
1226 | im->sfcount[MCAST_EXCLUDE] = 1; | |
1227 | im->sources = NULL; | |
1228 | im->tomb = NULL; | |
1229 | im->crcount = 0; | |
1230 | atomic_set(&im->refcnt, 1); | |
1231 | spin_lock_init(&im->lock); | |
1232 | #ifdef CONFIG_IP_MULTICAST | |
1233 | im->tm_running=0; | |
1234 | init_timer(&im->timer); | |
1235 | im->timer.data=(unsigned long)im; | |
1236 | im->timer.function=&igmp_timer_expire; | |
1237 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; | |
1238 | im->reporter = 0; | |
1239 | im->gsquery = 0; | |
1240 | #endif | |
1241 | im->loaded = 0; | |
1242 | write_lock_bh(&in_dev->mc_list_lock); | |
1243 | im->next=in_dev->mc_list; | |
1244 | in_dev->mc_list=im; | |
1245 | write_unlock_bh(&in_dev->mc_list_lock); | |
1246 | #ifdef CONFIG_IP_MULTICAST | |
1247 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1248 | #endif | |
1249 | igmp_group_added(im); | |
1250 | if (!in_dev->dead) | |
1251 | ip_rt_multicast_event(in_dev); | |
1252 | out: | |
1253 | return; | |
1254 | } | |
1255 | ||
a816c7c7 JV |
1256 | /* |
1257 | * Resend IGMP JOIN report; used for bonding. | |
1258 | */ | |
1259 | void ip_mc_rejoin_group(struct ip_mc_list *im) | |
1260 | { | |
08882669 | 1261 | #ifdef CONFIG_IP_MULTICAST |
a816c7c7 JV |
1262 | struct in_device *in_dev = im->interface; |
1263 | ||
a816c7c7 JV |
1264 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1265 | return; | |
1266 | ||
1267 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1268 | igmp_mod_timer(im, IGMP_Initial_Report_Delay); | |
1269 | return; | |
1270 | } | |
1271 | /* else, v3 */ | |
1272 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1273 | IGMP_Unsolicited_Report_Count; | |
1274 | igmp_ifc_event(in_dev); | |
1275 | #endif | |
1276 | } | |
1277 | ||
1da177e4 LT |
1278 | /* |
1279 | * A socket has left a multicast group on device dev | |
1280 | */ | |
1281 | ||
8f935bbd | 1282 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1283 | { |
1284 | struct ip_mc_list *i, **ip; | |
e905a9ed | 1285 | |
1da177e4 | 1286 | ASSERT_RTNL(); |
e905a9ed | 1287 | |
1da177e4 LT |
1288 | for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { |
1289 | if (i->multiaddr==addr) { | |
1290 | if (--i->users == 0) { | |
1291 | write_lock_bh(&in_dev->mc_list_lock); | |
1292 | *ip = i->next; | |
1293 | write_unlock_bh(&in_dev->mc_list_lock); | |
1294 | igmp_group_dropped(i); | |
1295 | ||
1296 | if (!in_dev->dead) | |
1297 | ip_rt_multicast_event(in_dev); | |
1298 | ||
1299 | ip_ma_put(i); | |
1300 | return; | |
1301 | } | |
1302 | break; | |
1303 | } | |
1304 | } | |
1305 | } | |
1306 | ||
1307 | /* Device going down */ | |
1308 | ||
1309 | void ip_mc_down(struct in_device *in_dev) | |
1310 | { | |
1311 | struct ip_mc_list *i; | |
1312 | ||
1313 | ASSERT_RTNL(); | |
1314 | ||
1315 | for (i=in_dev->mc_list; i; i=i->next) | |
1316 | igmp_group_dropped(i); | |
1317 | ||
1318 | #ifdef CONFIG_IP_MULTICAST | |
1319 | in_dev->mr_ifc_count = 0; | |
1320 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1321 | __in_dev_put(in_dev); | |
1322 | in_dev->mr_gq_running = 0; | |
1323 | if (del_timer(&in_dev->mr_gq_timer)) | |
1324 | __in_dev_put(in_dev); | |
1325 | igmpv3_clear_delrec(in_dev); | |
1326 | #endif | |
1327 | ||
1328 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1329 | } | |
1330 | ||
1331 | void ip_mc_init_dev(struct in_device *in_dev) | |
1332 | { | |
1333 | ASSERT_RTNL(); | |
1334 | ||
1335 | in_dev->mc_tomb = NULL; | |
1336 | #ifdef CONFIG_IP_MULTICAST | |
1337 | in_dev->mr_gq_running = 0; | |
1338 | init_timer(&in_dev->mr_gq_timer); | |
1339 | in_dev->mr_gq_timer.data=(unsigned long) in_dev; | |
1340 | in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; | |
1341 | in_dev->mr_ifc_count = 0; | |
1342 | init_timer(&in_dev->mr_ifc_timer); | |
1343 | in_dev->mr_ifc_timer.data=(unsigned long) in_dev; | |
1344 | in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; | |
1345 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; | |
1346 | #endif | |
1347 | ||
1348 | rwlock_init(&in_dev->mc_list_lock); | |
1349 | spin_lock_init(&in_dev->mc_tomb_lock); | |
1350 | } | |
1351 | ||
1352 | /* Device going up */ | |
1353 | ||
1354 | void ip_mc_up(struct in_device *in_dev) | |
1355 | { | |
1356 | struct ip_mc_list *i; | |
1357 | ||
1358 | ASSERT_RTNL(); | |
1359 | ||
1360 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1361 | ||
1362 | for (i=in_dev->mc_list; i; i=i->next) | |
1363 | igmp_group_added(i); | |
1364 | } | |
1365 | ||
1366 | /* | |
1367 | * Device is about to be destroyed: clean up. | |
1368 | */ | |
1369 | ||
1370 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1371 | { | |
1372 | struct ip_mc_list *i; | |
1373 | ||
1374 | ASSERT_RTNL(); | |
1375 | ||
1376 | /* Deactivate timers */ | |
1377 | ip_mc_down(in_dev); | |
1378 | ||
1379 | write_lock_bh(&in_dev->mc_list_lock); | |
1380 | while ((i = in_dev->mc_list) != NULL) { | |
1381 | in_dev->mc_list = i->next; | |
1382 | write_unlock_bh(&in_dev->mc_list_lock); | |
1383 | ||
1384 | igmp_group_dropped(i); | |
1385 | ip_ma_put(i); | |
1386 | ||
1387 | write_lock_bh(&in_dev->mc_list_lock); | |
1388 | } | |
1389 | write_unlock_bh(&in_dev->mc_list_lock); | |
1390 | } | |
1391 | ||
1392 | static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) | |
1393 | { | |
1394 | struct flowi fl = { .nl_u = { .ip4_u = | |
1395 | { .daddr = imr->imr_multiaddr.s_addr } } }; | |
1396 | struct rtable *rt; | |
1397 | struct net_device *dev = NULL; | |
1398 | struct in_device *idev = NULL; | |
1399 | ||
1400 | if (imr->imr_ifindex) { | |
1401 | idev = inetdev_by_index(imr->imr_ifindex); | |
1402 | if (idev) | |
1403 | __in_dev_put(idev); | |
1404 | return idev; | |
1405 | } | |
1406 | if (imr->imr_address.s_addr) { | |
1407 | dev = ip_dev_find(imr->imr_address.s_addr); | |
1408 | if (!dev) | |
1409 | return NULL; | |
15333061 | 1410 | dev_put(dev); |
1da177e4 LT |
1411 | } |
1412 | ||
1413 | if (!dev && !ip_route_output_key(&rt, &fl)) { | |
1414 | dev = rt->u.dst.dev; | |
1415 | ip_rt_put(rt); | |
1416 | } | |
1417 | if (dev) { | |
1418 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1419 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1420 | } |
1421 | return idev; | |
1422 | } | |
1423 | ||
1424 | /* | |
1425 | * Join a socket to a group | |
1426 | */ | |
ab32ea5d BH |
1427 | int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; |
1428 | int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; | |
1da177e4 LT |
1429 | |
1430 | ||
1431 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1432 | __be32 *psfsrc) |
1da177e4 LT |
1433 | { |
1434 | struct ip_sf_list *psf, *psf_prev; | |
1435 | int rv = 0; | |
1436 | ||
1437 | psf_prev = NULL; | |
1438 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1439 | if (psf->sf_inaddr == *psfsrc) | |
1440 | break; | |
1441 | psf_prev = psf; | |
1442 | } | |
1443 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1444 | /* source filter not found, or count wrong => bug */ | |
1445 | return -ESRCH; | |
1446 | } | |
1447 | psf->sf_count[sfmode]--; | |
1448 | if (psf->sf_count[sfmode] == 0) { | |
1449 | ip_rt_multicast_event(pmc->interface); | |
1450 | } | |
1451 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1452 | #ifdef CONFIG_IP_MULTICAST | |
1453 | struct in_device *in_dev = pmc->interface; | |
1454 | #endif | |
1455 | ||
1456 | /* no more filters for this source */ | |
1457 | if (psf_prev) | |
1458 | psf_prev->sf_next = psf->sf_next; | |
1459 | else | |
1460 | pmc->sources = psf->sf_next; | |
1461 | #ifdef CONFIG_IP_MULTICAST | |
1462 | if (psf->sf_oldin && | |
1463 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
e905a9ed | 1464 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1465 | IGMP_Unsolicited_Report_Count; |
1466 | psf->sf_next = pmc->tomb; | |
1467 | pmc->tomb = psf; | |
1468 | rv = 1; | |
1469 | } else | |
1470 | #endif | |
1471 | kfree(psf); | |
1472 | } | |
1473 | return rv; | |
1474 | } | |
1475 | ||
1476 | #ifndef CONFIG_IP_MULTICAST | |
1477 | #define igmp_ifc_event(x) do { } while (0) | |
1478 | #endif | |
1479 | ||
8f935bbd AV |
1480 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1481 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1482 | { |
1483 | struct ip_mc_list *pmc; | |
1484 | int changerec = 0; | |
1485 | int i, err; | |
1486 | ||
1487 | if (!in_dev) | |
1488 | return -ENODEV; | |
1489 | read_lock(&in_dev->mc_list_lock); | |
1490 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1491 | if (*pmca == pmc->multiaddr) | |
1492 | break; | |
1493 | } | |
1494 | if (!pmc) { | |
1495 | /* MCA not found?? bug */ | |
1496 | read_unlock(&in_dev->mc_list_lock); | |
1497 | return -ESRCH; | |
1498 | } | |
1499 | spin_lock_bh(&pmc->lock); | |
1500 | read_unlock(&in_dev->mc_list_lock); | |
1501 | #ifdef CONFIG_IP_MULTICAST | |
1502 | sf_markstate(pmc); | |
1503 | #endif | |
1504 | if (!delta) { | |
1505 | err = -EINVAL; | |
1506 | if (!pmc->sfcount[sfmode]) | |
1507 | goto out_unlock; | |
1508 | pmc->sfcount[sfmode]--; | |
1509 | } | |
1510 | err = 0; | |
1511 | for (i=0; i<sfcount; i++) { | |
1512 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1513 | ||
1514 | changerec |= rv > 0; | |
1515 | if (!err && rv < 0) | |
1516 | err = rv; | |
1517 | } | |
1518 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1519 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1520 | pmc->sfcount[MCAST_INCLUDE]) { | |
1521 | #ifdef CONFIG_IP_MULTICAST | |
1522 | struct ip_sf_list *psf; | |
1523 | #endif | |
1524 | ||
1525 | /* filter mode change */ | |
1526 | pmc->sfmode = MCAST_INCLUDE; | |
1527 | #ifdef CONFIG_IP_MULTICAST | |
e905a9ed | 1528 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1529 | IGMP_Unsolicited_Report_Count; |
1530 | in_dev->mr_ifc_count = pmc->crcount; | |
1531 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1532 | psf->sf_crcount = 0; | |
1533 | igmp_ifc_event(pmc->interface); | |
1534 | } else if (sf_setstate(pmc) || changerec) { | |
1535 | igmp_ifc_event(pmc->interface); | |
1536 | #endif | |
1537 | } | |
1538 | out_unlock: | |
1539 | spin_unlock_bh(&pmc->lock); | |
1540 | return err; | |
1541 | } | |
1542 | ||
1543 | /* | |
1544 | * Add multicast single-source filter to the interface list | |
1545 | */ | |
1546 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1547 | __be32 *psfsrc, int delta) |
1da177e4 LT |
1548 | { |
1549 | struct ip_sf_list *psf, *psf_prev; | |
1550 | ||
1551 | psf_prev = NULL; | |
1552 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1553 | if (psf->sf_inaddr == *psfsrc) | |
1554 | break; | |
1555 | psf_prev = psf; | |
1556 | } | |
1557 | if (!psf) { | |
0da974f4 | 1558 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1559 | if (!psf) |
1560 | return -ENOBUFS; | |
1da177e4 LT |
1561 | psf->sf_inaddr = *psfsrc; |
1562 | if (psf_prev) { | |
1563 | psf_prev->sf_next = psf; | |
1564 | } else | |
1565 | pmc->sources = psf; | |
1566 | } | |
1567 | psf->sf_count[sfmode]++; | |
1568 | if (psf->sf_count[sfmode] == 1) { | |
1569 | ip_rt_multicast_event(pmc->interface); | |
1570 | } | |
1571 | return 0; | |
1572 | } | |
1573 | ||
1574 | #ifdef CONFIG_IP_MULTICAST | |
1575 | static void sf_markstate(struct ip_mc_list *pmc) | |
1576 | { | |
1577 | struct ip_sf_list *psf; | |
1578 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1579 | ||
1580 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1581 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1582 | psf->sf_oldin = mca_xcount == | |
1583 | psf->sf_count[MCAST_EXCLUDE] && | |
1584 | !psf->sf_count[MCAST_INCLUDE]; | |
1585 | } else | |
1586 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1587 | } | |
1588 | ||
1589 | static int sf_setstate(struct ip_mc_list *pmc) | |
1590 | { | |
ad12583f | 1591 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1592 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1593 | int qrv = pmc->interface->mr_qrv; | |
1594 | int new_in, rv; | |
1595 | ||
1596 | rv = 0; | |
1597 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1598 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1599 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1600 | !psf->sf_count[MCAST_INCLUDE]; | |
1601 | } else | |
1602 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1603 | if (new_in) { |
1604 | if (!psf->sf_oldin) { | |
76edc605 | 1605 | struct ip_sf_list *prev = NULL; |
ad12583f DS |
1606 | |
1607 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { | |
1608 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1609 | break; | |
1610 | prev = dpsf; | |
1611 | } | |
1612 | if (dpsf) { | |
1613 | if (prev) | |
1614 | prev->sf_next = dpsf->sf_next; | |
1615 | else | |
1616 | pmc->tomb = dpsf->sf_next; | |
1617 | kfree(dpsf); | |
1618 | } | |
1619 | psf->sf_crcount = qrv; | |
1620 | rv++; | |
1621 | } | |
1622 | } else if (psf->sf_oldin) { | |
1623 | ||
1624 | psf->sf_crcount = 0; | |
1625 | /* | |
1626 | * add or update "delete" records if an active filter | |
1627 | * is now inactive | |
1628 | */ | |
1629 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) | |
1630 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1631 | break; | |
1632 | if (!dpsf) { | |
1633 | dpsf = (struct ip_sf_list *) | |
1634 | kmalloc(sizeof(*dpsf), GFP_ATOMIC); | |
1635 | if (!dpsf) | |
1636 | continue; | |
1637 | *dpsf = *psf; | |
1638 | /* pmc->lock held by callers */ | |
1639 | dpsf->sf_next = pmc->tomb; | |
1640 | pmc->tomb = dpsf; | |
1641 | } | |
1642 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1643 | rv++; |
1644 | } | |
1645 | } | |
1646 | return rv; | |
1647 | } | |
1648 | #endif | |
1649 | ||
1650 | /* | |
1651 | * Add multicast source filter list to the interface list | |
1652 | */ | |
8f935bbd AV |
1653 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1654 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1655 | { |
1656 | struct ip_mc_list *pmc; | |
1657 | int isexclude; | |
1658 | int i, err; | |
1659 | ||
1660 | if (!in_dev) | |
1661 | return -ENODEV; | |
1662 | read_lock(&in_dev->mc_list_lock); | |
1663 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1664 | if (*pmca == pmc->multiaddr) | |
1665 | break; | |
1666 | } | |
1667 | if (!pmc) { | |
1668 | /* MCA not found?? bug */ | |
1669 | read_unlock(&in_dev->mc_list_lock); | |
1670 | return -ESRCH; | |
1671 | } | |
1672 | spin_lock_bh(&pmc->lock); | |
1673 | read_unlock(&in_dev->mc_list_lock); | |
1674 | ||
1675 | #ifdef CONFIG_IP_MULTICAST | |
1676 | sf_markstate(pmc); | |
1677 | #endif | |
1678 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1679 | if (!delta) | |
1680 | pmc->sfcount[sfmode]++; | |
1681 | err = 0; | |
1682 | for (i=0; i<sfcount; i++) { | |
1683 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); | |
1684 | if (err) | |
1685 | break; | |
1686 | } | |
1687 | if (err) { | |
1688 | int j; | |
1689 | ||
1690 | pmc->sfcount[sfmode]--; | |
1691 | for (j=0; j<i; j++) | |
1692 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1693 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { | |
1694 | #ifdef CONFIG_IP_MULTICAST | |
1695 | struct in_device *in_dev = pmc->interface; | |
1696 | struct ip_sf_list *psf; | |
1697 | #endif | |
1698 | ||
1699 | /* filter mode change */ | |
1700 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1701 | pmc->sfmode = MCAST_EXCLUDE; | |
1702 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1703 | pmc->sfmode = MCAST_INCLUDE; | |
1704 | #ifdef CONFIG_IP_MULTICAST | |
1705 | /* else no filters; keep old mode for reports */ | |
1706 | ||
e905a9ed | 1707 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1708 | IGMP_Unsolicited_Report_Count; |
1709 | in_dev->mr_ifc_count = pmc->crcount; | |
1710 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1711 | psf->sf_crcount = 0; | |
1712 | igmp_ifc_event(in_dev); | |
1713 | } else if (sf_setstate(pmc)) { | |
1714 | igmp_ifc_event(in_dev); | |
1715 | #endif | |
1716 | } | |
1717 | spin_unlock_bh(&pmc->lock); | |
1718 | return err; | |
1719 | } | |
1720 | ||
1721 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1722 | { | |
1723 | struct ip_sf_list *psf, *nextpsf; | |
1724 | ||
1725 | for (psf=pmc->tomb; psf; psf=nextpsf) { | |
1726 | nextpsf = psf->sf_next; | |
1727 | kfree(psf); | |
1728 | } | |
1729 | pmc->tomb = NULL; | |
1730 | for (psf=pmc->sources; psf; psf=nextpsf) { | |
1731 | nextpsf = psf->sf_next; | |
1732 | kfree(psf); | |
1733 | } | |
1734 | pmc->sources = NULL; | |
1735 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1736 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1737 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1738 | } | |
1739 | ||
1740 | ||
1741 | /* | |
1742 | * Join a multicast group | |
1743 | */ | |
1744 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1745 | { | |
1746 | int err; | |
8f935bbd | 1747 | __be32 addr = imr->imr_multiaddr.s_addr; |
ca9b907d | 1748 | struct ip_mc_socklist *iml=NULL, *i; |
1da177e4 LT |
1749 | struct in_device *in_dev; |
1750 | struct inet_sock *inet = inet_sk(sk); | |
ca9b907d | 1751 | int ifindex; |
1da177e4 LT |
1752 | int count = 0; |
1753 | ||
1754 | if (!MULTICAST(addr)) | |
1755 | return -EINVAL; | |
1756 | ||
6756ae4b | 1757 | rtnl_lock(); |
1da177e4 LT |
1758 | |
1759 | in_dev = ip_mc_find_dev(imr); | |
1760 | ||
1761 | if (!in_dev) { | |
1762 | iml = NULL; | |
1763 | err = -ENODEV; | |
1764 | goto done; | |
1765 | } | |
1766 | ||
1da177e4 | 1767 | err = -EADDRINUSE; |
ca9b907d | 1768 | ifindex = imr->imr_ifindex; |
1da177e4 | 1769 | for (i = inet->mc_list; i; i = i->next) { |
ca9b907d DS |
1770 | if (i->multi.imr_multiaddr.s_addr == addr && |
1771 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1772 | goto done; |
1da177e4 LT |
1773 | count++; |
1774 | } | |
1775 | err = -ENOBUFS; | |
ca9b907d DS |
1776 | if (count >= sysctl_igmp_max_memberships) |
1777 | goto done; | |
8b3a7005 | 1778 | iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); |
ca9b907d | 1779 | if (iml == NULL) |
1da177e4 | 1780 | goto done; |
ca9b907d | 1781 | |
1da177e4 LT |
1782 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1783 | iml->next = inet->mc_list; | |
1da177e4 LT |
1784 | iml->sflist = NULL; |
1785 | iml->sfmode = MCAST_EXCLUDE; | |
1786 | inet->mc_list = iml; | |
1787 | ip_mc_inc_group(in_dev, addr); | |
1da177e4 | 1788 | err = 0; |
1da177e4 | 1789 | done: |
6756ae4b | 1790 | rtnl_unlock(); |
1da177e4 LT |
1791 | return err; |
1792 | } | |
1793 | ||
1794 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
1795 | struct in_device *in_dev) | |
1796 | { | |
1797 | int err; | |
1798 | ||
1799 | if (iml->sflist == 0) { | |
1800 | /* any-source empty exclude case */ | |
1801 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1802 | iml->sfmode, 0, NULL, 0); | |
1803 | } | |
1804 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1805 | iml->sfmode, iml->sflist->sl_count, | |
1806 | iml->sflist->sl_addr, 0); | |
1807 | sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); | |
1808 | iml->sflist = NULL; | |
1809 | return err; | |
1810 | } | |
1811 | ||
1812 | /* | |
1813 | * Ask a socket to leave a group. | |
1814 | */ | |
1815 | ||
1816 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1817 | { | |
1818 | struct inet_sock *inet = inet_sk(sk); | |
1819 | struct ip_mc_socklist *iml, **imlp; | |
84b42bae | 1820 | struct in_device *in_dev; |
8f935bbd | 1821 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 1822 | u32 ifindex; |
acd6e00b | 1823 | int ret = -EADDRNOTAVAIL; |
1da177e4 LT |
1824 | |
1825 | rtnl_lock(); | |
84b42bae | 1826 | in_dev = ip_mc_find_dev(imr); |
84b42bae | 1827 | ifindex = imr->imr_ifindex; |
1da177e4 | 1828 | for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { |
acd6e00b DS |
1829 | if (iml->multi.imr_multiaddr.s_addr != group) |
1830 | continue; | |
1831 | if (ifindex) { | |
1832 | if (iml->multi.imr_ifindex != ifindex) | |
1833 | continue; | |
1834 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
1835 | iml->multi.imr_address.s_addr) | |
1836 | continue; | |
1da177e4 | 1837 | |
acd6e00b | 1838 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 1839 | |
acd6e00b DS |
1840 | *imlp = iml->next; |
1841 | ||
1842 | if (in_dev) | |
84b42bae | 1843 | ip_mc_dec_group(in_dev, group); |
acd6e00b DS |
1844 | rtnl_unlock(); |
1845 | sock_kfree_s(sk, iml, sizeof(*iml)); | |
1846 | return 0; | |
1da177e4 | 1847 | } |
acd6e00b DS |
1848 | if (!in_dev) |
1849 | ret = -ENODEV; | |
1da177e4 | 1850 | rtnl_unlock(); |
acd6e00b | 1851 | return ret; |
1da177e4 LT |
1852 | } |
1853 | ||
1854 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1855 | ip_mreq_source *mreqs, int ifindex) | |
1856 | { | |
1857 | int err; | |
1858 | struct ip_mreqn imr; | |
63007727 | 1859 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
1860 | struct ip_mc_socklist *pmc; |
1861 | struct in_device *in_dev = NULL; | |
1862 | struct inet_sock *inet = inet_sk(sk); | |
1863 | struct ip_sf_socklist *psl; | |
8cdaaa15 | 1864 | int leavegroup = 0; |
1da177e4 LT |
1865 | int i, j, rv; |
1866 | ||
1867 | if (!MULTICAST(addr)) | |
1868 | return -EINVAL; | |
1869 | ||
6756ae4b | 1870 | rtnl_lock(); |
1da177e4 LT |
1871 | |
1872 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1873 | imr.imr_address.s_addr = mreqs->imr_interface; | |
1874 | imr.imr_ifindex = ifindex; | |
1875 | in_dev = ip_mc_find_dev(&imr); | |
1876 | ||
1877 | if (!in_dev) { | |
1878 | err = -ENODEV; | |
1879 | goto done; | |
1880 | } | |
1881 | err = -EADDRNOTAVAIL; | |
1882 | ||
1883 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
ca9b907d DS |
1884 | if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr |
1885 | && pmc->multi.imr_ifindex == imr.imr_ifindex) | |
1da177e4 LT |
1886 | break; |
1887 | } | |
917f2f10 DS |
1888 | if (!pmc) { /* must have a prior join */ |
1889 | err = -EINVAL; | |
1da177e4 | 1890 | goto done; |
917f2f10 | 1891 | } |
1da177e4 LT |
1892 | /* if a source filter was set, must be the same mode as before */ |
1893 | if (pmc->sflist) { | |
917f2f10 DS |
1894 | if (pmc->sfmode != omode) { |
1895 | err = -EINVAL; | |
1da177e4 | 1896 | goto done; |
917f2f10 | 1897 | } |
1da177e4 LT |
1898 | } else if (pmc->sfmode != omode) { |
1899 | /* allow mode switches for empty-set filters */ | |
1900 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 1901 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
1902 | NULL, 0); |
1903 | pmc->sfmode = omode; | |
1904 | } | |
1905 | ||
1906 | psl = pmc->sflist; | |
1907 | if (!add) { | |
1908 | if (!psl) | |
917f2f10 | 1909 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 LT |
1910 | rv = !0; |
1911 | for (i=0; i<psl->sl_count; i++) { | |
1912 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 1913 | sizeof(__be32)); |
1da177e4 LT |
1914 | if (rv == 0) |
1915 | break; | |
1916 | } | |
1917 | if (rv) /* source not found */ | |
917f2f10 | 1918 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 1919 | |
8cdaaa15 DS |
1920 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1921 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
1922 | leavegroup = 1; | |
1923 | goto done; | |
1924 | } | |
1925 | ||
1da177e4 | 1926 | /* update the interface filter */ |
e905a9ed | 1927 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
1928 | &mreqs->imr_sourceaddr, 1); |
1929 | ||
1930 | for (j=i+1; j<psl->sl_count; j++) | |
1931 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
1932 | psl->sl_count--; | |
1933 | err = 0; | |
1934 | goto done; | |
1935 | } | |
1936 | /* else, add a new source to the filter */ | |
1937 | ||
1938 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
1939 | err = -ENOBUFS; | |
1940 | goto done; | |
1941 | } | |
1942 | if (!psl || psl->sl_count == psl->sl_max) { | |
1943 | struct ip_sf_socklist *newpsl; | |
1944 | int count = IP_SFBLOCK; | |
1945 | ||
1946 | if (psl) | |
1947 | count += psl->sl_max; | |
8b3a7005 | 1948 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
1949 | if (!newpsl) { |
1950 | err = -ENOBUFS; | |
1951 | goto done; | |
1952 | } | |
1953 | newpsl->sl_max = count; | |
1954 | newpsl->sl_count = count - IP_SFBLOCK; | |
1955 | if (psl) { | |
1956 | for (i=0; i<psl->sl_count; i++) | |
1957 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
1958 | sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); | |
1959 | } | |
1960 | pmc->sflist = psl = newpsl; | |
1961 | } | |
1962 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
1963 | for (i=0; i<psl->sl_count; i++) { | |
1964 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 1965 | sizeof(__be32)); |
1da177e4 LT |
1966 | if (rv == 0) |
1967 | break; | |
1968 | } | |
1969 | if (rv == 0) /* address already there is an error */ | |
1970 | goto done; | |
1971 | for (j=psl->sl_count-1; j>=i; j--) | |
1972 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
1973 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
1974 | psl->sl_count++; | |
1975 | err = 0; | |
1976 | /* update the interface list */ | |
e905a9ed | 1977 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
1978 | &mreqs->imr_sourceaddr, 1); |
1979 | done: | |
6756ae4b | 1980 | rtnl_unlock(); |
8cdaaa15 DS |
1981 | if (leavegroup) |
1982 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
1983 | return err; |
1984 | } | |
1985 | ||
1986 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
1987 | { | |
9951f036 | 1988 | int err = 0; |
1da177e4 | 1989 | struct ip_mreqn imr; |
63007727 | 1990 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
1991 | struct ip_mc_socklist *pmc; |
1992 | struct in_device *in_dev; | |
1993 | struct inet_sock *inet = inet_sk(sk); | |
1994 | struct ip_sf_socklist *newpsl, *psl; | |
9951f036 | 1995 | int leavegroup = 0; |
1da177e4 LT |
1996 | |
1997 | if (!MULTICAST(addr)) | |
1998 | return -EINVAL; | |
1999 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2000 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2001 | return -EINVAL; | |
2002 | ||
6756ae4b | 2003 | rtnl_lock(); |
1da177e4 LT |
2004 | |
2005 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2006 | imr.imr_address.s_addr = msf->imsf_interface; | |
2007 | imr.imr_ifindex = ifindex; | |
2008 | in_dev = ip_mc_find_dev(&imr); | |
2009 | ||
2010 | if (!in_dev) { | |
2011 | err = -ENODEV; | |
2012 | goto done; | |
2013 | } | |
1da177e4 | 2014 | |
9951f036 DS |
2015 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2016 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2017 | leavegroup = 1; | |
2018 | goto done; | |
2019 | } | |
2020 | ||
1da177e4 LT |
2021 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { |
2022 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
2023 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2024 | break; | |
2025 | } | |
917f2f10 DS |
2026 | if (!pmc) { /* must have a prior join */ |
2027 | err = -EINVAL; | |
1da177e4 | 2028 | goto done; |
917f2f10 | 2029 | } |
1da177e4 | 2030 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2031 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2032 | GFP_KERNEL); | |
1da177e4 LT |
2033 | if (!newpsl) { |
2034 | err = -ENOBUFS; | |
2035 | goto done; | |
2036 | } | |
2037 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2038 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2039 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2040 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2041 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2042 | if (err) { | |
2043 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2044 | goto done; | |
2045 | } | |
8713dbf0 | 2046 | } else { |
1da177e4 | 2047 | newpsl = NULL; |
8713dbf0 YZ |
2048 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2049 | msf->imsf_fmode, 0, NULL, 0); | |
2050 | } | |
1da177e4 LT |
2051 | psl = pmc->sflist; |
2052 | if (psl) { | |
2053 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2054 | psl->sl_count, psl->sl_addr, 0); | |
2055 | sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); | |
2056 | } else | |
2057 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2058 | 0, NULL, 0); | |
2059 | pmc->sflist = newpsl; | |
2060 | pmc->sfmode = msf->imsf_fmode; | |
917f2f10 | 2061 | err = 0; |
1da177e4 | 2062 | done: |
6756ae4b | 2063 | rtnl_unlock(); |
9951f036 DS |
2064 | if (leavegroup) |
2065 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2066 | return err; |
2067 | } | |
2068 | ||
2069 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2070 | struct ip_msfilter __user *optval, int __user *optlen) | |
2071 | { | |
2072 | int err, len, count, copycount; | |
2073 | struct ip_mreqn imr; | |
63007727 | 2074 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2075 | struct ip_mc_socklist *pmc; |
2076 | struct in_device *in_dev; | |
2077 | struct inet_sock *inet = inet_sk(sk); | |
2078 | struct ip_sf_socklist *psl; | |
2079 | ||
2080 | if (!MULTICAST(addr)) | |
2081 | return -EINVAL; | |
2082 | ||
6756ae4b | 2083 | rtnl_lock(); |
1da177e4 LT |
2084 | |
2085 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2086 | imr.imr_address.s_addr = msf->imsf_interface; | |
2087 | imr.imr_ifindex = 0; | |
2088 | in_dev = ip_mc_find_dev(&imr); | |
2089 | ||
2090 | if (!in_dev) { | |
2091 | err = -ENODEV; | |
2092 | goto done; | |
2093 | } | |
2094 | err = -EADDRNOTAVAIL; | |
2095 | ||
2096 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2097 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
2098 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2099 | break; | |
2100 | } | |
2101 | if (!pmc) /* must have a prior join */ | |
2102 | goto done; | |
2103 | msf->imsf_fmode = pmc->sfmode; | |
2104 | psl = pmc->sflist; | |
6756ae4b | 2105 | rtnl_unlock(); |
1da177e4 LT |
2106 | if (!psl) { |
2107 | len = 0; | |
2108 | count = 0; | |
2109 | } else { | |
2110 | count = psl->sl_count; | |
2111 | } | |
2112 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2113 | len = copycount * sizeof(psl->sl_addr[0]); | |
2114 | msf->imsf_numsrc = count; | |
2115 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2116 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2117 | return -EFAULT; | |
2118 | } | |
2119 | if (len && | |
2120 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2121 | return -EFAULT; | |
2122 | return 0; | |
2123 | done: | |
6756ae4b | 2124 | rtnl_unlock(); |
1da177e4 LT |
2125 | return err; |
2126 | } | |
2127 | ||
2128 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2129 | struct group_filter __user *optval, int __user *optlen) | |
2130 | { | |
2131 | int err, i, count, copycount; | |
2132 | struct sockaddr_in *psin; | |
63007727 | 2133 | __be32 addr; |
1da177e4 LT |
2134 | struct ip_mc_socklist *pmc; |
2135 | struct inet_sock *inet = inet_sk(sk); | |
2136 | struct ip_sf_socklist *psl; | |
2137 | ||
2138 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2139 | if (psin->sin_family != AF_INET) | |
2140 | return -EINVAL; | |
2141 | addr = psin->sin_addr.s_addr; | |
2142 | if (!MULTICAST(addr)) | |
2143 | return -EINVAL; | |
2144 | ||
6756ae4b | 2145 | rtnl_lock(); |
1da177e4 LT |
2146 | |
2147 | err = -EADDRNOTAVAIL; | |
2148 | ||
2149 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2150 | if (pmc->multi.imr_multiaddr.s_addr == addr && | |
2151 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2152 | break; | |
2153 | } | |
2154 | if (!pmc) /* must have a prior join */ | |
2155 | goto done; | |
2156 | gsf->gf_fmode = pmc->sfmode; | |
2157 | psl = pmc->sflist; | |
6756ae4b | 2158 | rtnl_unlock(); |
1da177e4 LT |
2159 | count = psl ? psl->sl_count : 0; |
2160 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2161 | gsf->gf_numsrc = count; | |
2162 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2163 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2164 | return -EFAULT; | |
2165 | } | |
2166 | for (i=0; i<copycount; i++) { | |
2167 | struct sockaddr_in *psin; | |
2168 | struct sockaddr_storage ss; | |
2169 | ||
2170 | psin = (struct sockaddr_in *)&ss; | |
2171 | memset(&ss, 0, sizeof(ss)); | |
2172 | psin->sin_family = AF_INET; | |
2173 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2174 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2175 | return -EFAULT; | |
2176 | } | |
2177 | return 0; | |
2178 | done: | |
6756ae4b | 2179 | rtnl_unlock(); |
1da177e4 LT |
2180 | return err; |
2181 | } | |
2182 | ||
2183 | /* | |
2184 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2185 | */ | |
c0cda068 | 2186 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2187 | { |
2188 | struct inet_sock *inet = inet_sk(sk); | |
2189 | struct ip_mc_socklist *pmc; | |
2190 | struct ip_sf_socklist *psl; | |
2191 | int i; | |
2192 | ||
2193 | if (!MULTICAST(loc_addr)) | |
2194 | return 1; | |
2195 | ||
2196 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2197 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && | |
2198 | pmc->multi.imr_ifindex == dif) | |
2199 | break; | |
2200 | } | |
2201 | if (!pmc) | |
2202 | return 1; | |
2203 | psl = pmc->sflist; | |
2204 | if (!psl) | |
2205 | return pmc->sfmode == MCAST_EXCLUDE; | |
2206 | ||
2207 | for (i=0; i<psl->sl_count; i++) { | |
2208 | if (psl->sl_addr[i] == rmt_addr) | |
2209 | break; | |
2210 | } | |
2211 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) | |
2212 | return 0; | |
2213 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) | |
2214 | return 0; | |
2215 | return 1; | |
2216 | } | |
2217 | ||
2218 | /* | |
2219 | * A socket is closing. | |
2220 | */ | |
2221 | ||
2222 | void ip_mc_drop_socket(struct sock *sk) | |
2223 | { | |
2224 | struct inet_sock *inet = inet_sk(sk); | |
2225 | struct ip_mc_socklist *iml; | |
2226 | ||
2227 | if (inet->mc_list == NULL) | |
2228 | return; | |
2229 | ||
2230 | rtnl_lock(); | |
2231 | while ((iml = inet->mc_list) != NULL) { | |
2232 | struct in_device *in_dev; | |
2233 | inet->mc_list = iml->next; | |
2234 | ||
bb699cbc MR |
2235 | in_dev = inetdev_by_index(iml->multi.imr_ifindex); |
2236 | (void) ip_mc_leave_src(sk, iml, in_dev); | |
2237 | if (in_dev != NULL) { | |
1da177e4 LT |
2238 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
2239 | in_dev_put(in_dev); | |
2240 | } | |
2241 | sock_kfree_s(sk, iml, sizeof(*iml)); | |
1da177e4 LT |
2242 | } |
2243 | rtnl_unlock(); | |
2244 | } | |
2245 | ||
a60c4923 | 2246 | int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) |
1da177e4 LT |
2247 | { |
2248 | struct ip_mc_list *im; | |
2249 | struct ip_sf_list *psf; | |
2250 | int rv = 0; | |
2251 | ||
2252 | read_lock(&in_dev->mc_list_lock); | |
2253 | for (im=in_dev->mc_list; im; im=im->next) { | |
2254 | if (im->multiaddr == mc_addr) | |
2255 | break; | |
2256 | } | |
2257 | if (im && proto == IPPROTO_IGMP) { | |
2258 | rv = 1; | |
2259 | } else if (im) { | |
2260 | if (src_addr) { | |
2261 | for (psf=im->sources; psf; psf=psf->sf_next) { | |
2262 | if (psf->sf_inaddr == src_addr) | |
2263 | break; | |
2264 | } | |
2265 | if (psf) | |
2266 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2267 | psf->sf_count[MCAST_EXCLUDE] != | |
2268 | im->sfcount[MCAST_EXCLUDE]; | |
2269 | else | |
2270 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2271 | } else | |
2272 | rv = 1; /* unspecified source; tentatively allow */ | |
2273 | } | |
2274 | read_unlock(&in_dev->mc_list_lock); | |
2275 | return rv; | |
2276 | } | |
2277 | ||
2278 | #if defined(CONFIG_PROC_FS) | |
2279 | struct igmp_mc_iter_state { | |
2280 | struct net_device *dev; | |
2281 | struct in_device *in_dev; | |
2282 | }; | |
2283 | ||
2284 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2285 | ||
2286 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2287 | { | |
2288 | struct ip_mc_list *im = NULL; | |
2289 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2290 | ||
2291 | for (state->dev = dev_base, state->in_dev = NULL; | |
e905a9ed | 2292 | state->dev; |
1da177e4 LT |
2293 | state->dev = state->dev->next) { |
2294 | struct in_device *in_dev; | |
2295 | in_dev = in_dev_get(state->dev); | |
2296 | if (!in_dev) | |
2297 | continue; | |
2298 | read_lock(&in_dev->mc_list_lock); | |
2299 | im = in_dev->mc_list; | |
2300 | if (im) { | |
2301 | state->in_dev = in_dev; | |
2302 | break; | |
2303 | } | |
2304 | read_unlock(&in_dev->mc_list_lock); | |
2305 | in_dev_put(in_dev); | |
2306 | } | |
2307 | return im; | |
2308 | } | |
2309 | ||
2310 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2311 | { | |
2312 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2313 | im = im->next; | |
2314 | while (!im) { | |
2315 | if (likely(state->in_dev != NULL)) { | |
2316 | read_unlock(&state->in_dev->mc_list_lock); | |
2317 | in_dev_put(state->in_dev); | |
2318 | } | |
2319 | state->dev = state->dev->next; | |
2320 | if (!state->dev) { | |
2321 | state->in_dev = NULL; | |
2322 | break; | |
2323 | } | |
2324 | state->in_dev = in_dev_get(state->dev); | |
2325 | if (!state->in_dev) | |
2326 | continue; | |
2327 | read_lock(&state->in_dev->mc_list_lock); | |
2328 | im = state->in_dev->mc_list; | |
2329 | } | |
2330 | return im; | |
2331 | } | |
2332 | ||
2333 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2334 | { | |
2335 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2336 | if (im) | |
2337 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2338 | --pos; | |
2339 | return pos ? NULL : im; | |
2340 | } | |
2341 | ||
2342 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
2343 | { | |
2344 | read_lock(&dev_base_lock); | |
2345 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2346 | } | |
2347 | ||
2348 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2349 | { | |
2350 | struct ip_mc_list *im; | |
2351 | if (v == SEQ_START_TOKEN) | |
2352 | im = igmp_mc_get_first(seq); | |
2353 | else | |
2354 | im = igmp_mc_get_next(seq, v); | |
2355 | ++*pos; | |
2356 | return im; | |
2357 | } | |
2358 | ||
2359 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
2360 | { | |
2361 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2362 | if (likely(state->in_dev != NULL)) { | |
2363 | read_unlock(&state->in_dev->mc_list_lock); | |
2364 | in_dev_put(state->in_dev); | |
2365 | state->in_dev = NULL; | |
2366 | } | |
2367 | state->dev = NULL; | |
2368 | read_unlock(&dev_base_lock); | |
2369 | } | |
2370 | ||
2371 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2372 | { | |
2373 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2374 | seq_puts(seq, |
1da177e4 LT |
2375 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2376 | else { | |
2377 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2378 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2379 | char *querier; | |
2380 | #ifdef CONFIG_IP_MULTICAST | |
2381 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2382 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2383 | "V3"; | |
2384 | #else | |
2385 | querier = "NONE"; | |
2386 | #endif | |
2387 | ||
2388 | if (state->in_dev->mc_list == im) { | |
2389 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", | |
2390 | state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); | |
2391 | } | |
2392 | ||
2393 | seq_printf(seq, | |
338fcf98 | 2394 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 LT |
2395 | im->multiaddr, im->users, |
2396 | im->tm_running, im->tm_running ? | |
2397 | jiffies_to_clock_t(im->timer.expires-jiffies) : 0, | |
2398 | im->reporter); | |
2399 | } | |
2400 | return 0; | |
2401 | } | |
2402 | ||
f690808e | 2403 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2404 | .start = igmp_mc_seq_start, |
2405 | .next = igmp_mc_seq_next, | |
2406 | .stop = igmp_mc_seq_stop, | |
2407 | .show = igmp_mc_seq_show, | |
2408 | }; | |
2409 | ||
2410 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2411 | { | |
2412 | struct seq_file *seq; | |
2413 | int rc = -ENOMEM; | |
0da974f4 | 2414 | struct igmp_mc_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); |
1da177e4 LT |
2415 | |
2416 | if (!s) | |
2417 | goto out; | |
2418 | rc = seq_open(file, &igmp_mc_seq_ops); | |
2419 | if (rc) | |
2420 | goto out_kfree; | |
2421 | ||
2422 | seq = file->private_data; | |
2423 | seq->private = s; | |
1da177e4 LT |
2424 | out: |
2425 | return rc; | |
2426 | out_kfree: | |
2427 | kfree(s); | |
2428 | goto out; | |
2429 | } | |
2430 | ||
9a32144e | 2431 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2432 | .owner = THIS_MODULE, |
2433 | .open = igmp_mc_seq_open, | |
2434 | .read = seq_read, | |
2435 | .llseek = seq_lseek, | |
2436 | .release = seq_release_private, | |
2437 | }; | |
2438 | ||
2439 | struct igmp_mcf_iter_state { | |
2440 | struct net_device *dev; | |
2441 | struct in_device *idev; | |
2442 | struct ip_mc_list *im; | |
2443 | }; | |
2444 | ||
2445 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2446 | ||
2447 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2448 | { | |
2449 | struct ip_sf_list *psf = NULL; | |
2450 | struct ip_mc_list *im = NULL; | |
2451 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2452 | ||
2453 | for (state->dev = dev_base, state->idev = NULL, state->im = NULL; | |
e905a9ed | 2454 | state->dev; |
1da177e4 LT |
2455 | state->dev = state->dev->next) { |
2456 | struct in_device *idev; | |
2457 | idev = in_dev_get(state->dev); | |
2458 | if (unlikely(idev == NULL)) | |
2459 | continue; | |
2460 | read_lock(&idev->mc_list_lock); | |
2461 | im = idev->mc_list; | |
2462 | if (likely(im != NULL)) { | |
2463 | spin_lock_bh(&im->lock); | |
2464 | psf = im->sources; | |
2465 | if (likely(psf != NULL)) { | |
2466 | state->im = im; | |
2467 | state->idev = idev; | |
2468 | break; | |
2469 | } | |
2470 | spin_unlock_bh(&im->lock); | |
2471 | } | |
2472 | read_unlock(&idev->mc_list_lock); | |
2473 | in_dev_put(idev); | |
2474 | } | |
2475 | return psf; | |
2476 | } | |
2477 | ||
2478 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2479 | { | |
2480 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2481 | ||
2482 | psf = psf->sf_next; | |
2483 | while (!psf) { | |
2484 | spin_unlock_bh(&state->im->lock); | |
2485 | state->im = state->im->next; | |
2486 | while (!state->im) { | |
2487 | if (likely(state->idev != NULL)) { | |
2488 | read_unlock(&state->idev->mc_list_lock); | |
2489 | in_dev_put(state->idev); | |
2490 | } | |
2491 | state->dev = state->dev->next; | |
2492 | if (!state->dev) { | |
2493 | state->idev = NULL; | |
2494 | goto out; | |
2495 | } | |
2496 | state->idev = in_dev_get(state->dev); | |
2497 | if (!state->idev) | |
2498 | continue; | |
2499 | read_lock(&state->idev->mc_list_lock); | |
2500 | state->im = state->idev->mc_list; | |
2501 | } | |
2502 | if (!state->im) | |
2503 | break; | |
2504 | spin_lock_bh(&state->im->lock); | |
2505 | psf = state->im->sources; | |
2506 | } | |
2507 | out: | |
2508 | return psf; | |
2509 | } | |
2510 | ||
2511 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2512 | { | |
2513 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2514 | if (psf) | |
2515 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2516 | --pos; | |
2517 | return pos ? NULL : psf; | |
2518 | } | |
2519 | ||
2520 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
2521 | { | |
2522 | read_lock(&dev_base_lock); | |
2523 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2524 | } | |
2525 | ||
2526 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2527 | { | |
2528 | struct ip_sf_list *psf; | |
2529 | if (v == SEQ_START_TOKEN) | |
2530 | psf = igmp_mcf_get_first(seq); | |
2531 | else | |
2532 | psf = igmp_mcf_get_next(seq, v); | |
2533 | ++*pos; | |
2534 | return psf; | |
2535 | } | |
2536 | ||
2537 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
2538 | { | |
2539 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2540 | if (likely(state->im != NULL)) { | |
2541 | spin_unlock_bh(&state->im->lock); | |
2542 | state->im = NULL; | |
2543 | } | |
2544 | if (likely(state->idev != NULL)) { | |
2545 | read_unlock(&state->idev->mc_list_lock); | |
2546 | in_dev_put(state->idev); | |
2547 | state->idev = NULL; | |
2548 | } | |
2549 | state->dev = NULL; | |
2550 | read_unlock(&dev_base_lock); | |
2551 | } | |
2552 | ||
2553 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2554 | { | |
2555 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2556 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2557 | ||
2558 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2559 | seq_printf(seq, |
1da177e4 LT |
2560 | "%3s %6s " |
2561 | "%10s %10s %6s %6s\n", "Idx", | |
2562 | "Device", "MCA", | |
2563 | "SRC", "INC", "EXC"); | |
2564 | } else { | |
2565 | seq_printf(seq, | |
2566 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2567 | "0x%08x %6lu %6lu\n", |
2568 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2569 | ntohl(state->im->multiaddr), |
2570 | ntohl(psf->sf_inaddr), | |
2571 | psf->sf_count[MCAST_INCLUDE], | |
2572 | psf->sf_count[MCAST_EXCLUDE]); | |
2573 | } | |
2574 | return 0; | |
2575 | } | |
2576 | ||
f690808e | 2577 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2578 | .start = igmp_mcf_seq_start, |
2579 | .next = igmp_mcf_seq_next, | |
2580 | .stop = igmp_mcf_seq_stop, | |
2581 | .show = igmp_mcf_seq_show, | |
2582 | }; | |
2583 | ||
2584 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2585 | { | |
2586 | struct seq_file *seq; | |
2587 | int rc = -ENOMEM; | |
0da974f4 | 2588 | struct igmp_mcf_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); |
1da177e4 LT |
2589 | |
2590 | if (!s) | |
2591 | goto out; | |
2592 | rc = seq_open(file, &igmp_mcf_seq_ops); | |
2593 | if (rc) | |
2594 | goto out_kfree; | |
2595 | ||
2596 | seq = file->private_data; | |
2597 | seq->private = s; | |
1da177e4 LT |
2598 | out: |
2599 | return rc; | |
2600 | out_kfree: | |
2601 | kfree(s); | |
2602 | goto out; | |
2603 | } | |
2604 | ||
9a32144e | 2605 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2606 | .owner = THIS_MODULE, |
2607 | .open = igmp_mcf_seq_open, | |
2608 | .read = seq_read, | |
2609 | .llseek = seq_lseek, | |
2610 | .release = seq_release_private, | |
2611 | }; | |
2612 | ||
2613 | int __init igmp_mc_proc_init(void) | |
2614 | { | |
2615 | proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); | |
2616 | proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); | |
2617 | return 0; | |
2618 | } | |
2619 | #endif | |
2620 | ||
2621 | EXPORT_SYMBOL(ip_mc_dec_group); | |
2622 | EXPORT_SYMBOL(ip_mc_inc_group); | |
2623 | EXPORT_SYMBOL(ip_mc_join_group); | |
a816c7c7 | 2624 | EXPORT_SYMBOL(ip_mc_rejoin_group); |