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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 | |
38 | * The enhancements are mainly based on Steve Deering's | |
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 | |
52 | * memberships but was being deleted, | |
53 | * which caused a "del_timer() called | |
54 | * from %p with timer not initialized\n" | |
55 | * message (960131). | |
56 | * Christian Daudt : removed del_timer from | |
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 | ||
75 | #include <linux/config.h> | |
76 | #include <linux/module.h> | |
77 | #include <asm/uaccess.h> | |
78 | #include <asm/system.h> | |
79 | #include <linux/types.h> | |
80 | #include <linux/kernel.h> | |
81 | #include <linux/jiffies.h> | |
82 | #include <linux/string.h> | |
83 | #include <linux/socket.h> | |
84 | #include <linux/sockios.h> | |
85 | #include <linux/in.h> | |
86 | #include <linux/inet.h> | |
87 | #include <linux/netdevice.h> | |
88 | #include <linux/skbuff.h> | |
89 | #include <linux/inetdevice.h> | |
90 | #include <linux/igmp.h> | |
91 | #include <linux/if_arp.h> | |
92 | #include <linux/rtnetlink.h> | |
93 | #include <linux/times.h> | |
14c85021 ACM |
94 | |
95 | #include <net/arp.h> | |
1da177e4 LT |
96 | #include <net/ip.h> |
97 | #include <net/protocol.h> | |
98 | #include <net/route.h> | |
99 | #include <net/sock.h> | |
100 | #include <net/checksum.h> | |
101 | #include <linux/netfilter_ipv4.h> | |
102 | #ifdef CONFIG_IP_MROUTE | |
103 | #include <linux/mroute.h> | |
104 | #endif | |
105 | #ifdef CONFIG_PROC_FS | |
106 | #include <linux/proc_fs.h> | |
107 | #include <linux/seq_file.h> | |
108 | #endif | |
109 | ||
110 | #define IP_MAX_MEMBERSHIPS 20 | |
111 | #define IP_MAX_MSF 10 | |
112 | ||
113 | #ifdef CONFIG_IP_MULTICAST | |
114 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
115 | ||
116 | #define IGMP_V1_Router_Present_Timeout (400*HZ) | |
117 | #define IGMP_V2_Router_Present_Timeout (400*HZ) | |
118 | #define IGMP_Unsolicited_Report_Interval (10*HZ) | |
119 | #define IGMP_Query_Response_Interval (10*HZ) | |
120 | #define IGMP_Unsolicited_Report_Count 2 | |
121 | ||
122 | ||
123 | #define IGMP_Initial_Report_Delay (1) | |
124 | ||
125 | /* IGMP_Initial_Report_Delay is not from IGMP specs! | |
126 | * IGMP specs require to report membership immediately after | |
127 | * joining a group, but we delay the first report by a | |
128 | * small interval. It seems more natural and still does not | |
129 | * contradict to specs provided this delay is small enough. | |
130 | */ | |
131 | ||
132 | #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \ | |
133 | (in_dev)->cnf.force_igmp_version == 1 || \ | |
134 | ((in_dev)->mr_v1_seen && \ | |
135 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
136 | #define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \ | |
137 | (in_dev)->cnf.force_igmp_version == 2 || \ | |
138 | ((in_dev)->mr_v2_seen && \ | |
139 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
140 | ||
141 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); | |
142 | static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr); | |
143 | static void igmpv3_clear_delrec(struct in_device *in_dev); | |
144 | static int sf_setstate(struct ip_mc_list *pmc); | |
145 | static void sf_markstate(struct ip_mc_list *pmc); | |
146 | #endif | |
147 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
148 | static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, | |
149 | int sfcount, __u32 *psfsrc, int delta); | |
150 | ||
151 | static void ip_ma_put(struct ip_mc_list *im) | |
152 | { | |
153 | if (atomic_dec_and_test(&im->refcnt)) { | |
154 | in_dev_put(im->interface); | |
155 | kfree(im); | |
156 | } | |
157 | } | |
158 | ||
159 | #ifdef CONFIG_IP_MULTICAST | |
160 | ||
161 | /* | |
162 | * Timer management | |
163 | */ | |
164 | ||
165 | static __inline__ void igmp_stop_timer(struct ip_mc_list *im) | |
166 | { | |
167 | spin_lock_bh(&im->lock); | |
168 | if (del_timer(&im->timer)) | |
169 | atomic_dec(&im->refcnt); | |
170 | im->tm_running=0; | |
171 | im->reporter = 0; | |
172 | im->unsolicit_count = 0; | |
173 | spin_unlock_bh(&im->lock); | |
174 | } | |
175 | ||
176 | /* It must be called with locked im->lock */ | |
177 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
178 | { | |
179 | int tv=net_random() % max_delay; | |
180 | ||
181 | im->tm_running=1; | |
182 | if (!mod_timer(&im->timer, jiffies+tv+2)) | |
183 | atomic_inc(&im->refcnt); | |
184 | } | |
185 | ||
186 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
187 | { | |
188 | int tv = net_random() % in_dev->mr_maxdelay; | |
189 | ||
190 | in_dev->mr_gq_running = 1; | |
191 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
192 | in_dev_hold(in_dev); | |
193 | } | |
194 | ||
195 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
196 | { | |
197 | int tv = net_random() % delay; | |
198 | ||
199 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
200 | in_dev_hold(in_dev); | |
201 | } | |
202 | ||
203 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
204 | { | |
205 | spin_lock_bh(&im->lock); | |
206 | im->unsolicit_count = 0; | |
207 | if (del_timer(&im->timer)) { | |
208 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
209 | add_timer(&im->timer); | |
210 | im->tm_running=1; | |
211 | spin_unlock_bh(&im->lock); | |
212 | return; | |
213 | } | |
214 | atomic_dec(&im->refcnt); | |
215 | } | |
216 | igmp_start_timer(im, max_delay); | |
217 | spin_unlock_bh(&im->lock); | |
218 | } | |
219 | ||
220 | ||
221 | /* | |
222 | * Send an IGMP report. | |
223 | */ | |
224 | ||
225 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
226 | ||
227 | ||
228 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
229 | int gdeleted, int sdeleted) | |
230 | { | |
231 | switch (type) { | |
232 | case IGMPV3_MODE_IS_INCLUDE: | |
233 | case IGMPV3_MODE_IS_EXCLUDE: | |
234 | if (gdeleted || sdeleted) | |
235 | return 0; | |
ad12583f DS |
236 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
237 | if (pmc->sfmode == MCAST_INCLUDE) | |
238 | return 1; | |
239 | /* don't include if this source is excluded | |
240 | * in all filters | |
241 | */ | |
242 | if (psf->sf_count[MCAST_INCLUDE]) | |
243 | return type == IGMPV3_MODE_IS_INCLUDE; | |
244 | return pmc->sfcount[MCAST_EXCLUDE] == | |
245 | psf->sf_count[MCAST_EXCLUDE]; | |
246 | } | |
247 | return 0; | |
1da177e4 LT |
248 | case IGMPV3_CHANGE_TO_INCLUDE: |
249 | if (gdeleted || sdeleted) | |
250 | return 0; | |
251 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
252 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
253 | if (gdeleted || sdeleted) | |
254 | return 0; | |
255 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
256 | psf->sf_count[MCAST_INCLUDE]) | |
257 | return 0; | |
258 | return pmc->sfcount[MCAST_EXCLUDE] == | |
259 | psf->sf_count[MCAST_EXCLUDE]; | |
260 | case IGMPV3_ALLOW_NEW_SOURCES: | |
261 | if (gdeleted || !psf->sf_crcount) | |
262 | return 0; | |
263 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
264 | case IGMPV3_BLOCK_OLD_SOURCES: | |
265 | if (pmc->sfmode == MCAST_INCLUDE) | |
266 | return gdeleted || (psf->sf_crcount && sdeleted); | |
267 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
268 | } | |
269 | return 0; | |
270 | } | |
271 | ||
272 | static int | |
273 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
274 | { | |
275 | struct ip_sf_list *psf; | |
276 | int scount = 0; | |
277 | ||
278 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
279 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) | |
280 | continue; | |
281 | scount++; | |
282 | } | |
283 | return scount; | |
284 | } | |
285 | ||
286 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) | |
287 | { | |
288 | struct sk_buff *skb; | |
289 | struct rtable *rt; | |
290 | struct iphdr *pip; | |
291 | struct igmpv3_report *pig; | |
292 | ||
293 | skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); | |
294 | if (skb == NULL) | |
295 | return NULL; | |
296 | ||
297 | { | |
298 | struct flowi fl = { .oif = dev->ifindex, | |
299 | .nl_u = { .ip4_u = { | |
300 | .daddr = IGMPV3_ALL_MCR } }, | |
301 | .proto = IPPROTO_IGMP }; | |
302 | if (ip_route_output_key(&rt, &fl)) { | |
303 | kfree_skb(skb); | |
304 | return NULL; | |
305 | } | |
306 | } | |
307 | if (rt->rt_src == 0) { | |
308 | kfree_skb(skb); | |
309 | ip_rt_put(rt); | |
310 | return NULL; | |
311 | } | |
312 | ||
313 | skb->dst = &rt->u.dst; | |
314 | skb->dev = dev; | |
315 | ||
316 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
317 | ||
318 | skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); | |
319 | ||
320 | pip->version = 4; | |
321 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
322 | pip->tos = 0xc0; | |
323 | pip->frag_off = htons(IP_DF); | |
324 | pip->ttl = 1; | |
325 | pip->daddr = rt->rt_dst; | |
326 | pip->saddr = rt->rt_src; | |
327 | pip->protocol = IPPROTO_IGMP; | |
328 | pip->tot_len = 0; /* filled in later */ | |
329 | ip_select_ident(pip, &rt->u.dst, NULL); | |
330 | ((u8*)&pip[1])[0] = IPOPT_RA; | |
331 | ((u8*)&pip[1])[1] = 4; | |
332 | ((u8*)&pip[1])[2] = 0; | |
333 | ((u8*)&pip[1])[3] = 0; | |
334 | ||
335 | pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig)); | |
336 | skb->h.igmph = (struct igmphdr *)pig; | |
337 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
338 | pig->resv1 = 0; | |
339 | pig->csum = 0; | |
340 | pig->resv2 = 0; | |
341 | pig->ngrec = 0; | |
342 | return skb; | |
343 | } | |
344 | ||
345 | static int igmpv3_sendpack(struct sk_buff *skb) | |
346 | { | |
347 | struct iphdr *pip = skb->nh.iph; | |
348 | struct igmphdr *pig = skb->h.igmph; | |
349 | int iplen, igmplen; | |
350 | ||
351 | iplen = skb->tail - (unsigned char *)skb->nh.iph; | |
352 | pip->tot_len = htons(iplen); | |
353 | ip_send_check(pip); | |
354 | ||
355 | igmplen = skb->tail - (unsigned char *)skb->h.igmph; | |
356 | pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen); | |
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; | |
383 | pih = (struct igmpv3_report *)skb->h.igmph; | |
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 | ||
1da177e4 LT |
416 | pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL; |
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) { | |
430 | u32 *psrc; | |
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 | ||
443 | if (AVAILABLE(skb) < sizeof(u32) + | |
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 | } | |
459 | psrc = (u32 *)skb_put(skb, sizeof(u32)); | |
460 | *psrc = psf->sf_inaddr; | |
ad12583f | 461 | scount++; stotal++; |
1da177e4 LT |
462 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
463 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
464 | psf->sf_crcount--; | |
465 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
466 | if (psf_prev) | |
467 | psf_prev->sf_next = psf->sf_next; | |
468 | else | |
469 | *psf_list = psf->sf_next; | |
470 | kfree(psf); | |
471 | continue; | |
472 | } | |
473 | } | |
474 | psf_prev = psf; | |
475 | } | |
ad12583f DS |
476 | |
477 | empty_source: | |
478 | if (!stotal) { | |
479 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
480 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
481 | return skb; | |
482 | if (pmc->crcount || isquery) { | |
483 | /* make sure we have room for group header */ | |
484 | if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { | |
485 | igmpv3_sendpack(skb); | |
486 | skb = NULL; /* add_grhead will get a new one */ | |
487 | } | |
488 | skb = add_grhead(skb, pmc, type, &pgr); | |
489 | } | |
490 | } | |
1da177e4 LT |
491 | if (pgr) |
492 | pgr->grec_nsrcs = htons(scount); | |
493 | ||
494 | if (isquery) | |
495 | pmc->gsquery = 0; /* clear query state on report */ | |
496 | return skb; | |
497 | } | |
498 | ||
499 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
500 | { | |
501 | struct sk_buff *skb = NULL; | |
502 | int type; | |
503 | ||
504 | if (!pmc) { | |
505 | read_lock(&in_dev->mc_list_lock); | |
506 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
507 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
508 | continue; | |
509 | spin_lock_bh(&pmc->lock); | |
510 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
511 | type = IGMPV3_MODE_IS_EXCLUDE; | |
512 | else | |
513 | type = IGMPV3_MODE_IS_INCLUDE; | |
514 | skb = add_grec(skb, pmc, type, 0, 0); | |
515 | spin_unlock_bh(&pmc->lock); | |
516 | } | |
517 | read_unlock(&in_dev->mc_list_lock); | |
518 | } else { | |
519 | spin_lock_bh(&pmc->lock); | |
520 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
521 | type = IGMPV3_MODE_IS_EXCLUDE; | |
522 | else | |
523 | type = IGMPV3_MODE_IS_INCLUDE; | |
524 | skb = add_grec(skb, pmc, type, 0, 0); | |
525 | spin_unlock_bh(&pmc->lock); | |
526 | } | |
527 | if (!skb) | |
528 | return 0; | |
529 | return igmpv3_sendpack(skb); | |
530 | } | |
531 | ||
532 | /* | |
533 | * remove zero-count source records from a source filter list | |
534 | */ | |
535 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
536 | { | |
537 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
538 | ||
539 | psf_prev = NULL; | |
540 | for (psf=*ppsf; psf; psf = psf_next) { | |
541 | psf_next = psf->sf_next; | |
542 | if (psf->sf_crcount == 0) { | |
543 | if (psf_prev) | |
544 | psf_prev->sf_next = psf->sf_next; | |
545 | else | |
546 | *ppsf = psf->sf_next; | |
547 | kfree(psf); | |
548 | } else | |
549 | psf_prev = psf; | |
550 | } | |
551 | } | |
552 | ||
553 | static void igmpv3_send_cr(struct in_device *in_dev) | |
554 | { | |
555 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
556 | struct sk_buff *skb = NULL; | |
557 | int type, dtype; | |
558 | ||
559 | read_lock(&in_dev->mc_list_lock); | |
560 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
561 | ||
562 | /* deleted MCA's */ | |
563 | pmc_prev = NULL; | |
564 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { | |
565 | pmc_next = pmc->next; | |
566 | if (pmc->sfmode == MCAST_INCLUDE) { | |
567 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
568 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
569 | skb = add_grec(skb, pmc, type, 1, 0); | |
570 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
571 | } | |
572 | if (pmc->crcount) { | |
1da177e4 LT |
573 | if (pmc->sfmode == MCAST_EXCLUDE) { |
574 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
575 | skb = add_grec(skb, pmc, type, 1, 0); | |
576 | } | |
ad12583f | 577 | pmc->crcount--; |
1da177e4 LT |
578 | if (pmc->crcount == 0) { |
579 | igmpv3_clear_zeros(&pmc->tomb); | |
580 | igmpv3_clear_zeros(&pmc->sources); | |
581 | } | |
582 | } | |
583 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
584 | if (pmc_prev) | |
585 | pmc_prev->next = pmc_next; | |
586 | else | |
587 | in_dev->mc_tomb = pmc_next; | |
588 | in_dev_put(pmc->interface); | |
589 | kfree(pmc); | |
590 | } else | |
591 | pmc_prev = pmc; | |
592 | } | |
593 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
594 | ||
595 | /* change recs */ | |
596 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
597 | spin_lock_bh(&pmc->lock); | |
598 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
599 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
600 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
601 | } else { | |
602 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
603 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
604 | } | |
605 | skb = add_grec(skb, pmc, type, 0, 0); | |
606 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
607 | ||
608 | /* filter mode changes */ | |
609 | if (pmc->crcount) { | |
1da177e4 LT |
610 | if (pmc->sfmode == MCAST_EXCLUDE) |
611 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
612 | else | |
613 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
614 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 615 | pmc->crcount--; |
1da177e4 LT |
616 | } |
617 | spin_unlock_bh(&pmc->lock); | |
618 | } | |
619 | read_unlock(&in_dev->mc_list_lock); | |
620 | ||
621 | if (!skb) | |
622 | return; | |
623 | (void) igmpv3_sendpack(skb); | |
624 | } | |
625 | ||
626 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
627 | int type) | |
628 | { | |
629 | struct sk_buff *skb; | |
630 | struct iphdr *iph; | |
631 | struct igmphdr *ih; | |
632 | struct rtable *rt; | |
633 | struct net_device *dev = in_dev->dev; | |
634 | u32 group = pmc ? pmc->multiaddr : 0; | |
635 | u32 dst; | |
636 | ||
637 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
638 | return igmpv3_send_report(in_dev, pmc); | |
639 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
640 | dst = IGMP_ALL_ROUTER; | |
641 | else | |
642 | dst = group; | |
643 | ||
644 | { | |
645 | struct flowi fl = { .oif = dev->ifindex, | |
646 | .nl_u = { .ip4_u = { .daddr = dst } }, | |
647 | .proto = IPPROTO_IGMP }; | |
648 | if (ip_route_output_key(&rt, &fl)) | |
649 | return -1; | |
650 | } | |
651 | if (rt->rt_src == 0) { | |
652 | ip_rt_put(rt); | |
653 | return -1; | |
654 | } | |
655 | ||
656 | skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); | |
657 | if (skb == NULL) { | |
658 | ip_rt_put(rt); | |
659 | return -1; | |
660 | } | |
661 | ||
662 | skb->dst = &rt->u.dst; | |
663 | ||
664 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
665 | ||
666 | skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); | |
667 | ||
668 | iph->version = 4; | |
669 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
670 | iph->tos = 0xc0; | |
671 | iph->frag_off = htons(IP_DF); | |
672 | iph->ttl = 1; | |
673 | iph->daddr = dst; | |
674 | iph->saddr = rt->rt_src; | |
675 | iph->protocol = IPPROTO_IGMP; | |
676 | iph->tot_len = htons(IGMP_SIZE); | |
677 | ip_select_ident(iph, &rt->u.dst, NULL); | |
678 | ((u8*)&iph[1])[0] = IPOPT_RA; | |
679 | ((u8*)&iph[1])[1] = 4; | |
680 | ((u8*)&iph[1])[2] = 0; | |
681 | ((u8*)&iph[1])[3] = 0; | |
682 | ip_send_check(iph); | |
683 | ||
684 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
685 | ih->type=type; | |
686 | ih->code=0; | |
687 | ih->csum=0; | |
688 | ih->group=group; | |
689 | ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
690 | ||
691 | return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, | |
692 | dst_output); | |
693 | } | |
694 | ||
695 | static void igmp_gq_timer_expire(unsigned long data) | |
696 | { | |
697 | struct in_device *in_dev = (struct in_device *)data; | |
698 | ||
699 | in_dev->mr_gq_running = 0; | |
700 | igmpv3_send_report(in_dev, NULL); | |
701 | __in_dev_put(in_dev); | |
702 | } | |
703 | ||
704 | static void igmp_ifc_timer_expire(unsigned long data) | |
705 | { | |
706 | struct in_device *in_dev = (struct in_device *)data; | |
707 | ||
708 | igmpv3_send_cr(in_dev); | |
709 | if (in_dev->mr_ifc_count) { | |
710 | in_dev->mr_ifc_count--; | |
711 | igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); | |
712 | } | |
713 | __in_dev_put(in_dev); | |
714 | } | |
715 | ||
716 | static void igmp_ifc_event(struct in_device *in_dev) | |
717 | { | |
718 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
719 | return; | |
720 | in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : | |
721 | IGMP_Unsolicited_Report_Count; | |
722 | igmp_ifc_start_timer(in_dev, 1); | |
723 | } | |
724 | ||
725 | ||
726 | static void igmp_timer_expire(unsigned long data) | |
727 | { | |
728 | struct ip_mc_list *im=(struct ip_mc_list *)data; | |
729 | struct in_device *in_dev = im->interface; | |
730 | ||
731 | spin_lock(&im->lock); | |
732 | im->tm_running=0; | |
733 | ||
734 | if (im->unsolicit_count) { | |
735 | im->unsolicit_count--; | |
736 | igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); | |
737 | } | |
738 | im->reporter = 1; | |
739 | spin_unlock(&im->lock); | |
740 | ||
741 | if (IGMP_V1_SEEN(in_dev)) | |
742 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
743 | else if (IGMP_V2_SEEN(in_dev)) | |
744 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
745 | else | |
746 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
747 | ||
748 | ip_ma_put(im); | |
749 | } | |
750 | ||
ad12583f DS |
751 | /* mark EXCLUDE-mode sources */ |
752 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs) | |
1da177e4 LT |
753 | { |
754 | struct ip_sf_list *psf; | |
755 | int i, scount; | |
756 | ||
ad12583f DS |
757 | scount = 0; |
758 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
759 | if (scount == nsrcs) | |
760 | break; | |
761 | for (i=0; i<nsrcs; i++) { | |
762 | /* skip inactive filters */ | |
763 | if (pmc->sfcount[MCAST_INCLUDE] || | |
764 | pmc->sfcount[MCAST_EXCLUDE] != | |
765 | psf->sf_count[MCAST_EXCLUDE]) | |
766 | continue; | |
767 | if (srcs[i] == psf->sf_inaddr) { | |
768 | scount++; | |
769 | break; | |
770 | } | |
771 | } | |
772 | } | |
773 | pmc->gsquery = 0; | |
774 | if (scount == nsrcs) /* all sources excluded */ | |
775 | return 0; | |
776 | return 1; | |
777 | } | |
778 | ||
779 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs) | |
780 | { | |
781 | struct ip_sf_list *psf; | |
782 | int i, scount; | |
783 | ||
784 | if (pmc->sfmode == MCAST_EXCLUDE) | |
785 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
786 | ||
787 | /* mark INCLUDE-mode sources */ | |
1da177e4 LT |
788 | scount = 0; |
789 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
790 | if (scount == nsrcs) | |
791 | break; | |
792 | for (i=0; i<nsrcs; i++) | |
793 | if (srcs[i] == psf->sf_inaddr) { | |
794 | psf->sf_gsresp = 1; | |
795 | scount++; | |
796 | break; | |
797 | } | |
798 | } | |
ad12583f DS |
799 | if (!scount) { |
800 | pmc->gsquery = 0; | |
801 | return 0; | |
802 | } | |
803 | pmc->gsquery = 1; | |
804 | return 1; | |
1da177e4 LT |
805 | } |
806 | ||
807 | static void igmp_heard_report(struct in_device *in_dev, u32 group) | |
808 | { | |
809 | struct ip_mc_list *im; | |
810 | ||
811 | /* Timers are only set for non-local groups */ | |
812 | ||
813 | if (group == IGMP_ALL_HOSTS) | |
814 | return; | |
815 | ||
816 | read_lock(&in_dev->mc_list_lock); | |
817 | for (im=in_dev->mc_list; im!=NULL; im=im->next) { | |
818 | if (im->multiaddr == group) { | |
819 | igmp_stop_timer(im); | |
820 | break; | |
821 | } | |
822 | } | |
823 | read_unlock(&in_dev->mc_list_lock); | |
824 | } | |
825 | ||
826 | static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
827 | int len) | |
828 | { | |
829 | struct igmphdr *ih = skb->h.igmph; | |
830 | struct igmpv3_query *ih3 = (struct igmpv3_query *)ih; | |
831 | struct ip_mc_list *im; | |
832 | u32 group = ih->group; | |
833 | int max_delay; | |
834 | int mark = 0; | |
835 | ||
836 | ||
837 | if (len == 8) { | |
838 | if (ih->code == 0) { | |
839 | /* Alas, old v1 router presents here. */ | |
840 | ||
841 | max_delay = IGMP_Query_Response_Interval; | |
842 | in_dev->mr_v1_seen = jiffies + | |
843 | IGMP_V1_Router_Present_Timeout; | |
844 | group = 0; | |
845 | } else { | |
846 | /* v2 router present */ | |
847 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
848 | in_dev->mr_v2_seen = jiffies + | |
849 | IGMP_V2_Router_Present_Timeout; | |
850 | } | |
851 | /* cancel the interface change timer */ | |
852 | in_dev->mr_ifc_count = 0; | |
853 | if (del_timer(&in_dev->mr_ifc_timer)) | |
854 | __in_dev_put(in_dev); | |
855 | /* clear deleted report items */ | |
856 | igmpv3_clear_delrec(in_dev); | |
857 | } else if (len < 12) { | |
858 | return; /* ignore bogus packet; freed by caller */ | |
859 | } else { /* v3 */ | |
860 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
861 | return; | |
862 | ||
863 | ih3 = (struct igmpv3_query *) skb->h.raw; | |
864 | if (ih3->nsrcs) { | |
865 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) | |
866 | + ntohs(ih3->nsrcs)*sizeof(__u32))) | |
867 | return; | |
868 | ih3 = (struct igmpv3_query *) skb->h.raw; | |
869 | } | |
870 | ||
871 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
872 | if (!max_delay) | |
873 | max_delay = 1; /* can't mod w/ 0 */ | |
874 | in_dev->mr_maxdelay = max_delay; | |
875 | if (ih3->qrv) | |
876 | in_dev->mr_qrv = ih3->qrv; | |
877 | if (!group) { /* general query */ | |
878 | if (ih3->nsrcs) | |
879 | return; /* no sources allowed */ | |
880 | igmp_gq_start_timer(in_dev); | |
881 | return; | |
882 | } | |
883 | /* mark sources to include, if group & source-specific */ | |
884 | mark = ih3->nsrcs != 0; | |
885 | } | |
886 | ||
887 | /* | |
888 | * - Start the timers in all of our membership records | |
889 | * that the query applies to for the interface on | |
890 | * which the query arrived excl. those that belong | |
891 | * to a "local" group (224.0.0.X) | |
892 | * - For timers already running check if they need to | |
893 | * be reset. | |
894 | * - Use the igmp->igmp_code field as the maximum | |
895 | * delay possible | |
896 | */ | |
897 | read_lock(&in_dev->mc_list_lock); | |
898 | for (im=in_dev->mc_list; im!=NULL; im=im->next) { | |
ad12583f DS |
899 | int changed; |
900 | ||
1da177e4 LT |
901 | if (group && group != im->multiaddr) |
902 | continue; | |
903 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
904 | continue; | |
905 | spin_lock_bh(&im->lock); | |
906 | if (im->tm_running) | |
907 | im->gsquery = im->gsquery && mark; | |
908 | else | |
909 | im->gsquery = mark; | |
ad12583f DS |
910 | changed = !im->gsquery || |
911 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); | |
1da177e4 | 912 | spin_unlock_bh(&im->lock); |
ad12583f DS |
913 | if (changed) |
914 | igmp_mod_timer(im, max_delay); | |
1da177e4 LT |
915 | } |
916 | read_unlock(&in_dev->mc_list_lock); | |
917 | } | |
918 | ||
919 | int igmp_rcv(struct sk_buff *skb) | |
920 | { | |
921 | /* This basically follows the spec line by line -- see RFC1112 */ | |
922 | struct igmphdr *ih; | |
923 | struct in_device *in_dev = in_dev_get(skb->dev); | |
924 | int len = skb->len; | |
925 | ||
926 | if (in_dev==NULL) { | |
927 | kfree_skb(skb); | |
928 | return 0; | |
929 | } | |
930 | ||
fb286bb2 HX |
931 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
932 | goto drop; | |
933 | ||
934 | switch (skb->ip_summed) { | |
935 | case CHECKSUM_HW: | |
936 | if (!(u16)csum_fold(skb->csum)) | |
937 | break; | |
938 | /* fall through */ | |
939 | case CHECKSUM_NONE: | |
940 | skb->csum = 0; | |
941 | if (__skb_checksum_complete(skb)) | |
942 | goto drop; | |
1da177e4 LT |
943 | } |
944 | ||
945 | ih = skb->h.igmph; | |
946 | switch (ih->type) { | |
947 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
948 | igmp_heard_query(in_dev, skb, len); | |
949 | break; | |
950 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
951 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
952 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
953 | /* Is it our report looped back? */ | |
954 | if (((struct rtable*)skb->dst)->fl.iif == 0) | |
955 | break; | |
24c69275 DS |
956 | /* don't rely on MC router hearing unicast reports */ |
957 | if (skb->pkt_type == PACKET_MULTICAST || | |
958 | skb->pkt_type == PACKET_BROADCAST) | |
959 | igmp_heard_report(in_dev, ih->group); | |
1da177e4 LT |
960 | break; |
961 | case IGMP_PIM: | |
962 | #ifdef CONFIG_IP_PIMSM_V1 | |
963 | in_dev_put(in_dev); | |
964 | return pim_rcv_v1(skb); | |
965 | #endif | |
966 | case IGMP_DVMRP: | |
967 | case IGMP_TRACE: | |
968 | case IGMP_HOST_LEAVE_MESSAGE: | |
969 | case IGMP_MTRACE: | |
970 | case IGMP_MTRACE_RESP: | |
971 | break; | |
972 | default: | |
dd1c1853 | 973 | break; |
1da177e4 | 974 | } |
fb286bb2 HX |
975 | |
976 | drop: | |
1da177e4 LT |
977 | in_dev_put(in_dev); |
978 | kfree_skb(skb); | |
979 | return 0; | |
980 | } | |
981 | ||
982 | #endif | |
983 | ||
984 | ||
985 | /* | |
986 | * Add a filter to a device | |
987 | */ | |
988 | ||
989 | static void ip_mc_filter_add(struct in_device *in_dev, u32 addr) | |
990 | { | |
991 | char buf[MAX_ADDR_LEN]; | |
992 | struct net_device *dev = in_dev->dev; | |
993 | ||
994 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
995 | We will get multicast token leakage, when IFF_MULTICAST | |
996 | is changed. This check should be done in dev->set_multicast_list | |
997 | routine. Something sort of: | |
998 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
999 | --ANK | |
1000 | */ | |
1001 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
1002 | dev_mc_add(dev,buf,dev->addr_len,0); | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * Remove a filter from a device | |
1007 | */ | |
1008 | ||
1009 | static void ip_mc_filter_del(struct in_device *in_dev, u32 addr) | |
1010 | { | |
1011 | char buf[MAX_ADDR_LEN]; | |
1012 | struct net_device *dev = in_dev->dev; | |
1013 | ||
1014 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
1015 | dev_mc_delete(dev,buf,dev->addr_len,0); | |
1016 | } | |
1017 | ||
1018 | #ifdef CONFIG_IP_MULTICAST | |
1019 | /* | |
1020 | * deleted ip_mc_list manipulation | |
1021 | */ | |
1022 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1023 | { | |
1024 | struct ip_mc_list *pmc; | |
1025 | ||
1026 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1027 | * are actually used. In particular, the refcnt and users are not | |
1028 | * used for management of the delete list. Using the same structure | |
1029 | * for deleted items allows change reports to use common code with | |
1030 | * non-deleted or query-response MCA's. | |
1031 | */ | |
8b3a7005 | 1032 | pmc = kmalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1033 | if (!pmc) |
1034 | return; | |
1035 | memset(pmc, 0, sizeof(*pmc)); | |
1036 | spin_lock_bh(&im->lock); | |
1037 | pmc->interface = im->interface; | |
1038 | in_dev_hold(in_dev); | |
1039 | pmc->multiaddr = im->multiaddr; | |
1040 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1041 | IGMP_Unsolicited_Report_Count; | |
1042 | pmc->sfmode = im->sfmode; | |
1043 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1044 | struct ip_sf_list *psf; | |
1045 | ||
1046 | pmc->tomb = im->tomb; | |
1047 | pmc->sources = im->sources; | |
1048 | im->tomb = im->sources = NULL; | |
1049 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1050 | psf->sf_crcount = pmc->crcount; | |
1051 | } | |
1052 | spin_unlock_bh(&im->lock); | |
1053 | ||
1054 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1055 | pmc->next = in_dev->mc_tomb; | |
1056 | in_dev->mc_tomb = pmc; | |
1057 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1058 | } | |
1059 | ||
1060 | static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr) | |
1061 | { | |
1062 | struct ip_mc_list *pmc, *pmc_prev; | |
1063 | struct ip_sf_list *psf, *psf_next; | |
1064 | ||
1065 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1066 | pmc_prev = NULL; | |
1067 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { | |
1068 | if (pmc->multiaddr == multiaddr) | |
1069 | break; | |
1070 | pmc_prev = pmc; | |
1071 | } | |
1072 | if (pmc) { | |
1073 | if (pmc_prev) | |
1074 | pmc_prev->next = pmc->next; | |
1075 | else | |
1076 | in_dev->mc_tomb = pmc->next; | |
1077 | } | |
1078 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1079 | if (pmc) { | |
1080 | for (psf=pmc->tomb; psf; psf=psf_next) { | |
1081 | psf_next = psf->sf_next; | |
1082 | kfree(psf); | |
1083 | } | |
1084 | in_dev_put(pmc->interface); | |
1085 | kfree(pmc); | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1090 | { | |
1091 | struct ip_mc_list *pmc, *nextpmc; | |
1092 | ||
1093 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1094 | pmc = in_dev->mc_tomb; | |
1095 | in_dev->mc_tomb = NULL; | |
1096 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1097 | ||
1098 | for (; pmc; pmc = nextpmc) { | |
1099 | nextpmc = pmc->next; | |
1100 | ip_mc_clear_src(pmc); | |
1101 | in_dev_put(pmc->interface); | |
1102 | kfree(pmc); | |
1103 | } | |
1104 | /* clear dead sources, too */ | |
1105 | read_lock(&in_dev->mc_list_lock); | |
1106 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1107 | struct ip_sf_list *psf, *psf_next; | |
1108 | ||
1109 | spin_lock_bh(&pmc->lock); | |
1110 | psf = pmc->tomb; | |
1111 | pmc->tomb = NULL; | |
1112 | spin_unlock_bh(&pmc->lock); | |
1113 | for (; psf; psf=psf_next) { | |
1114 | psf_next = psf->sf_next; | |
1115 | kfree(psf); | |
1116 | } | |
1117 | } | |
1118 | read_unlock(&in_dev->mc_list_lock); | |
1119 | } | |
1120 | #endif | |
1121 | ||
1122 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1123 | { | |
1124 | struct in_device *in_dev = im->interface; | |
1125 | #ifdef CONFIG_IP_MULTICAST | |
1126 | int reporter; | |
1127 | #endif | |
1128 | ||
1129 | if (im->loaded) { | |
1130 | im->loaded = 0; | |
1131 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1132 | } | |
1133 | ||
1134 | #ifdef CONFIG_IP_MULTICAST | |
1135 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1136 | return; | |
1137 | ||
1138 | reporter = im->reporter; | |
1139 | igmp_stop_timer(im); | |
1140 | ||
1141 | if (!in_dev->dead) { | |
1142 | if (IGMP_V1_SEEN(in_dev)) | |
1143 | goto done; | |
1144 | if (IGMP_V2_SEEN(in_dev)) { | |
1145 | if (reporter) | |
1146 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
1147 | goto done; | |
1148 | } | |
1149 | /* IGMPv3 */ | |
1150 | igmpv3_add_delrec(in_dev, im); | |
1151 | ||
1152 | igmp_ifc_event(in_dev); | |
1153 | } | |
1154 | done: | |
1155 | #endif | |
1156 | ip_mc_clear_src(im); | |
1157 | } | |
1158 | ||
1159 | static void igmp_group_added(struct ip_mc_list *im) | |
1160 | { | |
1161 | struct in_device *in_dev = im->interface; | |
1162 | ||
1163 | if (im->loaded == 0) { | |
1164 | im->loaded = 1; | |
1165 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1166 | } | |
1167 | ||
1168 | #ifdef CONFIG_IP_MULTICAST | |
1169 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1170 | return; | |
1171 | ||
1172 | if (in_dev->dead) | |
1173 | return; | |
1174 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1175 | spin_lock_bh(&im->lock); | |
1176 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1177 | spin_unlock_bh(&im->lock); | |
1178 | return; | |
1179 | } | |
1180 | /* else, v3 */ | |
1181 | ||
1182 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1183 | IGMP_Unsolicited_Report_Count; | |
1184 | igmp_ifc_event(in_dev); | |
1185 | #endif | |
1186 | } | |
1187 | ||
1188 | ||
1189 | /* | |
1190 | * Multicast list managers | |
1191 | */ | |
1192 | ||
1193 | ||
1194 | /* | |
1195 | * A socket has joined a multicast group on device dev. | |
1196 | */ | |
1197 | ||
1198 | void ip_mc_inc_group(struct in_device *in_dev, u32 addr) | |
1199 | { | |
1200 | struct ip_mc_list *im; | |
1201 | ||
1202 | ASSERT_RTNL(); | |
1203 | ||
1204 | for (im=in_dev->mc_list; im; im=im->next) { | |
1205 | if (im->multiaddr == addr) { | |
1206 | im->users++; | |
1207 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1208 | goto out; | |
1209 | } | |
1210 | } | |
1211 | ||
8b3a7005 | 1212 | im = kmalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1213 | if (!im) |
1214 | goto out; | |
1215 | ||
1216 | im->users=1; | |
1217 | im->interface=in_dev; | |
1218 | in_dev_hold(in_dev); | |
1219 | im->multiaddr=addr; | |
1220 | /* initial mode is (EX, empty) */ | |
1221 | im->sfmode = MCAST_EXCLUDE; | |
1222 | im->sfcount[MCAST_INCLUDE] = 0; | |
1223 | im->sfcount[MCAST_EXCLUDE] = 1; | |
1224 | im->sources = NULL; | |
1225 | im->tomb = NULL; | |
1226 | im->crcount = 0; | |
1227 | atomic_set(&im->refcnt, 1); | |
1228 | spin_lock_init(&im->lock); | |
1229 | #ifdef CONFIG_IP_MULTICAST | |
1230 | im->tm_running=0; | |
1231 | init_timer(&im->timer); | |
1232 | im->timer.data=(unsigned long)im; | |
1233 | im->timer.function=&igmp_timer_expire; | |
1234 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; | |
1235 | im->reporter = 0; | |
1236 | im->gsquery = 0; | |
1237 | #endif | |
1238 | im->loaded = 0; | |
1239 | write_lock_bh(&in_dev->mc_list_lock); | |
1240 | im->next=in_dev->mc_list; | |
1241 | in_dev->mc_list=im; | |
1242 | write_unlock_bh(&in_dev->mc_list_lock); | |
1243 | #ifdef CONFIG_IP_MULTICAST | |
1244 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1245 | #endif | |
1246 | igmp_group_added(im); | |
1247 | if (!in_dev->dead) | |
1248 | ip_rt_multicast_event(in_dev); | |
1249 | out: | |
1250 | return; | |
1251 | } | |
1252 | ||
1253 | /* | |
1254 | * A socket has left a multicast group on device dev | |
1255 | */ | |
1256 | ||
1257 | void ip_mc_dec_group(struct in_device *in_dev, u32 addr) | |
1258 | { | |
1259 | struct ip_mc_list *i, **ip; | |
1260 | ||
1261 | ASSERT_RTNL(); | |
1262 | ||
1263 | for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { | |
1264 | if (i->multiaddr==addr) { | |
1265 | if (--i->users == 0) { | |
1266 | write_lock_bh(&in_dev->mc_list_lock); | |
1267 | *ip = i->next; | |
1268 | write_unlock_bh(&in_dev->mc_list_lock); | |
1269 | igmp_group_dropped(i); | |
1270 | ||
1271 | if (!in_dev->dead) | |
1272 | ip_rt_multicast_event(in_dev); | |
1273 | ||
1274 | ip_ma_put(i); | |
1275 | return; | |
1276 | } | |
1277 | break; | |
1278 | } | |
1279 | } | |
1280 | } | |
1281 | ||
1282 | /* Device going down */ | |
1283 | ||
1284 | void ip_mc_down(struct in_device *in_dev) | |
1285 | { | |
1286 | struct ip_mc_list *i; | |
1287 | ||
1288 | ASSERT_RTNL(); | |
1289 | ||
1290 | for (i=in_dev->mc_list; i; i=i->next) | |
1291 | igmp_group_dropped(i); | |
1292 | ||
1293 | #ifdef CONFIG_IP_MULTICAST | |
1294 | in_dev->mr_ifc_count = 0; | |
1295 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1296 | __in_dev_put(in_dev); | |
1297 | in_dev->mr_gq_running = 0; | |
1298 | if (del_timer(&in_dev->mr_gq_timer)) | |
1299 | __in_dev_put(in_dev); | |
1300 | igmpv3_clear_delrec(in_dev); | |
1301 | #endif | |
1302 | ||
1303 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1304 | } | |
1305 | ||
1306 | void ip_mc_init_dev(struct in_device *in_dev) | |
1307 | { | |
1308 | ASSERT_RTNL(); | |
1309 | ||
1310 | in_dev->mc_tomb = NULL; | |
1311 | #ifdef CONFIG_IP_MULTICAST | |
1312 | in_dev->mr_gq_running = 0; | |
1313 | init_timer(&in_dev->mr_gq_timer); | |
1314 | in_dev->mr_gq_timer.data=(unsigned long) in_dev; | |
1315 | in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; | |
1316 | in_dev->mr_ifc_count = 0; | |
1317 | init_timer(&in_dev->mr_ifc_timer); | |
1318 | in_dev->mr_ifc_timer.data=(unsigned long) in_dev; | |
1319 | in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; | |
1320 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; | |
1321 | #endif | |
1322 | ||
1323 | rwlock_init(&in_dev->mc_list_lock); | |
1324 | spin_lock_init(&in_dev->mc_tomb_lock); | |
1325 | } | |
1326 | ||
1327 | /* Device going up */ | |
1328 | ||
1329 | void ip_mc_up(struct in_device *in_dev) | |
1330 | { | |
1331 | struct ip_mc_list *i; | |
1332 | ||
1333 | ASSERT_RTNL(); | |
1334 | ||
1335 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1336 | ||
1337 | for (i=in_dev->mc_list; i; i=i->next) | |
1338 | igmp_group_added(i); | |
1339 | } | |
1340 | ||
1341 | /* | |
1342 | * Device is about to be destroyed: clean up. | |
1343 | */ | |
1344 | ||
1345 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1346 | { | |
1347 | struct ip_mc_list *i; | |
1348 | ||
1349 | ASSERT_RTNL(); | |
1350 | ||
1351 | /* Deactivate timers */ | |
1352 | ip_mc_down(in_dev); | |
1353 | ||
1354 | write_lock_bh(&in_dev->mc_list_lock); | |
1355 | while ((i = in_dev->mc_list) != NULL) { | |
1356 | in_dev->mc_list = i->next; | |
1357 | write_unlock_bh(&in_dev->mc_list_lock); | |
1358 | ||
1359 | igmp_group_dropped(i); | |
1360 | ip_ma_put(i); | |
1361 | ||
1362 | write_lock_bh(&in_dev->mc_list_lock); | |
1363 | } | |
1364 | write_unlock_bh(&in_dev->mc_list_lock); | |
1365 | } | |
1366 | ||
1367 | static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) | |
1368 | { | |
1369 | struct flowi fl = { .nl_u = { .ip4_u = | |
1370 | { .daddr = imr->imr_multiaddr.s_addr } } }; | |
1371 | struct rtable *rt; | |
1372 | struct net_device *dev = NULL; | |
1373 | struct in_device *idev = NULL; | |
1374 | ||
1375 | if (imr->imr_ifindex) { | |
1376 | idev = inetdev_by_index(imr->imr_ifindex); | |
1377 | if (idev) | |
1378 | __in_dev_put(idev); | |
1379 | return idev; | |
1380 | } | |
1381 | if (imr->imr_address.s_addr) { | |
1382 | dev = ip_dev_find(imr->imr_address.s_addr); | |
1383 | if (!dev) | |
1384 | return NULL; | |
1385 | __dev_put(dev); | |
1386 | } | |
1387 | ||
1388 | if (!dev && !ip_route_output_key(&rt, &fl)) { | |
1389 | dev = rt->u.dst.dev; | |
1390 | ip_rt_put(rt); | |
1391 | } | |
1392 | if (dev) { | |
1393 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1394 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1395 | } |
1396 | return idev; | |
1397 | } | |
1398 | ||
1399 | /* | |
1400 | * Join a socket to a group | |
1401 | */ | |
1402 | int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS; | |
1403 | int sysctl_igmp_max_msf = IP_MAX_MSF; | |
1404 | ||
1405 | ||
1406 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
1407 | __u32 *psfsrc) | |
1408 | { | |
1409 | struct ip_sf_list *psf, *psf_prev; | |
1410 | int rv = 0; | |
1411 | ||
1412 | psf_prev = NULL; | |
1413 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1414 | if (psf->sf_inaddr == *psfsrc) | |
1415 | break; | |
1416 | psf_prev = psf; | |
1417 | } | |
1418 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1419 | /* source filter not found, or count wrong => bug */ | |
1420 | return -ESRCH; | |
1421 | } | |
1422 | psf->sf_count[sfmode]--; | |
1423 | if (psf->sf_count[sfmode] == 0) { | |
1424 | ip_rt_multicast_event(pmc->interface); | |
1425 | } | |
1426 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1427 | #ifdef CONFIG_IP_MULTICAST | |
1428 | struct in_device *in_dev = pmc->interface; | |
1429 | #endif | |
1430 | ||
1431 | /* no more filters for this source */ | |
1432 | if (psf_prev) | |
1433 | psf_prev->sf_next = psf->sf_next; | |
1434 | else | |
1435 | pmc->sources = psf->sf_next; | |
1436 | #ifdef CONFIG_IP_MULTICAST | |
1437 | if (psf->sf_oldin && | |
1438 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
1439 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1440 | IGMP_Unsolicited_Report_Count; | |
1441 | psf->sf_next = pmc->tomb; | |
1442 | pmc->tomb = psf; | |
1443 | rv = 1; | |
1444 | } else | |
1445 | #endif | |
1446 | kfree(psf); | |
1447 | } | |
1448 | return rv; | |
1449 | } | |
1450 | ||
1451 | #ifndef CONFIG_IP_MULTICAST | |
1452 | #define igmp_ifc_event(x) do { } while (0) | |
1453 | #endif | |
1454 | ||
1455 | static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode, | |
1456 | int sfcount, __u32 *psfsrc, int delta) | |
1457 | { | |
1458 | struct ip_mc_list *pmc; | |
1459 | int changerec = 0; | |
1460 | int i, err; | |
1461 | ||
1462 | if (!in_dev) | |
1463 | return -ENODEV; | |
1464 | read_lock(&in_dev->mc_list_lock); | |
1465 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1466 | if (*pmca == pmc->multiaddr) | |
1467 | break; | |
1468 | } | |
1469 | if (!pmc) { | |
1470 | /* MCA not found?? bug */ | |
1471 | read_unlock(&in_dev->mc_list_lock); | |
1472 | return -ESRCH; | |
1473 | } | |
1474 | spin_lock_bh(&pmc->lock); | |
1475 | read_unlock(&in_dev->mc_list_lock); | |
1476 | #ifdef CONFIG_IP_MULTICAST | |
1477 | sf_markstate(pmc); | |
1478 | #endif | |
1479 | if (!delta) { | |
1480 | err = -EINVAL; | |
1481 | if (!pmc->sfcount[sfmode]) | |
1482 | goto out_unlock; | |
1483 | pmc->sfcount[sfmode]--; | |
1484 | } | |
1485 | err = 0; | |
1486 | for (i=0; i<sfcount; i++) { | |
1487 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1488 | ||
1489 | changerec |= rv > 0; | |
1490 | if (!err && rv < 0) | |
1491 | err = rv; | |
1492 | } | |
1493 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1494 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1495 | pmc->sfcount[MCAST_INCLUDE]) { | |
1496 | #ifdef CONFIG_IP_MULTICAST | |
1497 | struct ip_sf_list *psf; | |
1498 | #endif | |
1499 | ||
1500 | /* filter mode change */ | |
1501 | pmc->sfmode = MCAST_INCLUDE; | |
1502 | #ifdef CONFIG_IP_MULTICAST | |
1503 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1504 | IGMP_Unsolicited_Report_Count; | |
1505 | in_dev->mr_ifc_count = pmc->crcount; | |
1506 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1507 | psf->sf_crcount = 0; | |
1508 | igmp_ifc_event(pmc->interface); | |
1509 | } else if (sf_setstate(pmc) || changerec) { | |
1510 | igmp_ifc_event(pmc->interface); | |
1511 | #endif | |
1512 | } | |
1513 | out_unlock: | |
1514 | spin_unlock_bh(&pmc->lock); | |
1515 | return err; | |
1516 | } | |
1517 | ||
1518 | /* | |
1519 | * Add multicast single-source filter to the interface list | |
1520 | */ | |
1521 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
1522 | __u32 *psfsrc, int delta) | |
1523 | { | |
1524 | struct ip_sf_list *psf, *psf_prev; | |
1525 | ||
1526 | psf_prev = NULL; | |
1527 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1528 | if (psf->sf_inaddr == *psfsrc) | |
1529 | break; | |
1530 | psf_prev = psf; | |
1531 | } | |
1532 | if (!psf) { | |
8b3a7005 | 1533 | psf = kmalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1534 | if (!psf) |
1535 | return -ENOBUFS; | |
1536 | memset(psf, 0, sizeof(*psf)); | |
1537 | psf->sf_inaddr = *psfsrc; | |
1538 | if (psf_prev) { | |
1539 | psf_prev->sf_next = psf; | |
1540 | } else | |
1541 | pmc->sources = psf; | |
1542 | } | |
1543 | psf->sf_count[sfmode]++; | |
1544 | if (psf->sf_count[sfmode] == 1) { | |
1545 | ip_rt_multicast_event(pmc->interface); | |
1546 | } | |
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | #ifdef CONFIG_IP_MULTICAST | |
1551 | static void sf_markstate(struct ip_mc_list *pmc) | |
1552 | { | |
1553 | struct ip_sf_list *psf; | |
1554 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1555 | ||
1556 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1557 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1558 | psf->sf_oldin = mca_xcount == | |
1559 | psf->sf_count[MCAST_EXCLUDE] && | |
1560 | !psf->sf_count[MCAST_INCLUDE]; | |
1561 | } else | |
1562 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1563 | } | |
1564 | ||
1565 | static int sf_setstate(struct ip_mc_list *pmc) | |
1566 | { | |
ad12583f | 1567 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1568 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1569 | int qrv = pmc->interface->mr_qrv; | |
1570 | int new_in, rv; | |
1571 | ||
1572 | rv = 0; | |
1573 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1574 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1575 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1576 | !psf->sf_count[MCAST_INCLUDE]; | |
1577 | } else | |
1578 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1579 | if (new_in) { |
1580 | if (!psf->sf_oldin) { | |
76edc605 | 1581 | struct ip_sf_list *prev = NULL; |
ad12583f DS |
1582 | |
1583 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { | |
1584 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1585 | break; | |
1586 | prev = dpsf; | |
1587 | } | |
1588 | if (dpsf) { | |
1589 | if (prev) | |
1590 | prev->sf_next = dpsf->sf_next; | |
1591 | else | |
1592 | pmc->tomb = dpsf->sf_next; | |
1593 | kfree(dpsf); | |
1594 | } | |
1595 | psf->sf_crcount = qrv; | |
1596 | rv++; | |
1597 | } | |
1598 | } else if (psf->sf_oldin) { | |
1599 | ||
1600 | psf->sf_crcount = 0; | |
1601 | /* | |
1602 | * add or update "delete" records if an active filter | |
1603 | * is now inactive | |
1604 | */ | |
1605 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) | |
1606 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1607 | break; | |
1608 | if (!dpsf) { | |
1609 | dpsf = (struct ip_sf_list *) | |
1610 | kmalloc(sizeof(*dpsf), GFP_ATOMIC); | |
1611 | if (!dpsf) | |
1612 | continue; | |
1613 | *dpsf = *psf; | |
1614 | /* pmc->lock held by callers */ | |
1615 | dpsf->sf_next = pmc->tomb; | |
1616 | pmc->tomb = dpsf; | |
1617 | } | |
1618 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1619 | rv++; |
1620 | } | |
1621 | } | |
1622 | return rv; | |
1623 | } | |
1624 | #endif | |
1625 | ||
1626 | /* | |
1627 | * Add multicast source filter list to the interface list | |
1628 | */ | |
1629 | static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, | |
1630 | int sfcount, __u32 *psfsrc, int delta) | |
1631 | { | |
1632 | struct ip_mc_list *pmc; | |
1633 | int isexclude; | |
1634 | int i, err; | |
1635 | ||
1636 | if (!in_dev) | |
1637 | return -ENODEV; | |
1638 | read_lock(&in_dev->mc_list_lock); | |
1639 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1640 | if (*pmca == pmc->multiaddr) | |
1641 | break; | |
1642 | } | |
1643 | if (!pmc) { | |
1644 | /* MCA not found?? bug */ | |
1645 | read_unlock(&in_dev->mc_list_lock); | |
1646 | return -ESRCH; | |
1647 | } | |
1648 | spin_lock_bh(&pmc->lock); | |
1649 | read_unlock(&in_dev->mc_list_lock); | |
1650 | ||
1651 | #ifdef CONFIG_IP_MULTICAST | |
1652 | sf_markstate(pmc); | |
1653 | #endif | |
1654 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1655 | if (!delta) | |
1656 | pmc->sfcount[sfmode]++; | |
1657 | err = 0; | |
1658 | for (i=0; i<sfcount; i++) { | |
1659 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); | |
1660 | if (err) | |
1661 | break; | |
1662 | } | |
1663 | if (err) { | |
1664 | int j; | |
1665 | ||
1666 | pmc->sfcount[sfmode]--; | |
1667 | for (j=0; j<i; j++) | |
1668 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1669 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { | |
1670 | #ifdef CONFIG_IP_MULTICAST | |
1671 | struct in_device *in_dev = pmc->interface; | |
1672 | struct ip_sf_list *psf; | |
1673 | #endif | |
1674 | ||
1675 | /* filter mode change */ | |
1676 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1677 | pmc->sfmode = MCAST_EXCLUDE; | |
1678 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1679 | pmc->sfmode = MCAST_INCLUDE; | |
1680 | #ifdef CONFIG_IP_MULTICAST | |
1681 | /* else no filters; keep old mode for reports */ | |
1682 | ||
1683 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1684 | IGMP_Unsolicited_Report_Count; | |
1685 | in_dev->mr_ifc_count = pmc->crcount; | |
1686 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1687 | psf->sf_crcount = 0; | |
1688 | igmp_ifc_event(in_dev); | |
1689 | } else if (sf_setstate(pmc)) { | |
1690 | igmp_ifc_event(in_dev); | |
1691 | #endif | |
1692 | } | |
1693 | spin_unlock_bh(&pmc->lock); | |
1694 | return err; | |
1695 | } | |
1696 | ||
1697 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1698 | { | |
1699 | struct ip_sf_list *psf, *nextpsf; | |
1700 | ||
1701 | for (psf=pmc->tomb; psf; psf=nextpsf) { | |
1702 | nextpsf = psf->sf_next; | |
1703 | kfree(psf); | |
1704 | } | |
1705 | pmc->tomb = NULL; | |
1706 | for (psf=pmc->sources; psf; psf=nextpsf) { | |
1707 | nextpsf = psf->sf_next; | |
1708 | kfree(psf); | |
1709 | } | |
1710 | pmc->sources = NULL; | |
1711 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1712 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1713 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1714 | } | |
1715 | ||
1716 | ||
1717 | /* | |
1718 | * Join a multicast group | |
1719 | */ | |
1720 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1721 | { | |
1722 | int err; | |
1723 | u32 addr = imr->imr_multiaddr.s_addr; | |
ca9b907d | 1724 | struct ip_mc_socklist *iml=NULL, *i; |
1da177e4 LT |
1725 | struct in_device *in_dev; |
1726 | struct inet_sock *inet = inet_sk(sk); | |
ca9b907d | 1727 | int ifindex; |
1da177e4 LT |
1728 | int count = 0; |
1729 | ||
1730 | if (!MULTICAST(addr)) | |
1731 | return -EINVAL; | |
1732 | ||
1733 | rtnl_shlock(); | |
1734 | ||
1735 | in_dev = ip_mc_find_dev(imr); | |
1736 | ||
1737 | if (!in_dev) { | |
1738 | iml = NULL; | |
1739 | err = -ENODEV; | |
1740 | goto done; | |
1741 | } | |
1742 | ||
1da177e4 | 1743 | err = -EADDRINUSE; |
ca9b907d | 1744 | ifindex = imr->imr_ifindex; |
1da177e4 | 1745 | for (i = inet->mc_list; i; i = i->next) { |
ca9b907d DS |
1746 | if (i->multi.imr_multiaddr.s_addr == addr && |
1747 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1748 | goto done; |
1da177e4 LT |
1749 | count++; |
1750 | } | |
1751 | err = -ENOBUFS; | |
ca9b907d DS |
1752 | if (count >= sysctl_igmp_max_memberships) |
1753 | goto done; | |
8b3a7005 | 1754 | iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); |
ca9b907d | 1755 | if (iml == NULL) |
1da177e4 | 1756 | goto done; |
ca9b907d | 1757 | |
1da177e4 LT |
1758 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1759 | iml->next = inet->mc_list; | |
1da177e4 LT |
1760 | iml->sflist = NULL; |
1761 | iml->sfmode = MCAST_EXCLUDE; | |
1762 | inet->mc_list = iml; | |
1763 | ip_mc_inc_group(in_dev, addr); | |
1da177e4 | 1764 | err = 0; |
1da177e4 LT |
1765 | done: |
1766 | rtnl_shunlock(); | |
1da177e4 LT |
1767 | return err; |
1768 | } | |
1769 | ||
1770 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
1771 | struct in_device *in_dev) | |
1772 | { | |
1773 | int err; | |
1774 | ||
1775 | if (iml->sflist == 0) { | |
1776 | /* any-source empty exclude case */ | |
1777 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1778 | iml->sfmode, 0, NULL, 0); | |
1779 | } | |
1780 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1781 | iml->sfmode, iml->sflist->sl_count, | |
1782 | iml->sflist->sl_addr, 0); | |
1783 | sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); | |
1784 | iml->sflist = NULL; | |
1785 | return err; | |
1786 | } | |
1787 | ||
1788 | /* | |
1789 | * Ask a socket to leave a group. | |
1790 | */ | |
1791 | ||
1792 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1793 | { | |
1794 | struct inet_sock *inet = inet_sk(sk); | |
1795 | struct ip_mc_socklist *iml, **imlp; | |
84b42bae DS |
1796 | struct in_device *in_dev; |
1797 | u32 group = imr->imr_multiaddr.s_addr; | |
1798 | u32 ifindex; | |
1da177e4 LT |
1799 | |
1800 | rtnl_lock(); | |
84b42bae DS |
1801 | in_dev = ip_mc_find_dev(imr); |
1802 | if (!in_dev) { | |
1803 | rtnl_unlock(); | |
1804 | return -ENODEV; | |
1805 | } | |
1806 | ifindex = imr->imr_ifindex; | |
1da177e4 | 1807 | for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { |
84b42bae DS |
1808 | if (iml->multi.imr_multiaddr.s_addr == group && |
1809 | iml->multi.imr_ifindex == ifindex) { | |
1810 | (void) ip_mc_leave_src(sk, iml, in_dev); | |
1da177e4 LT |
1811 | |
1812 | *imlp = iml->next; | |
1813 | ||
84b42bae | 1814 | ip_mc_dec_group(in_dev, group); |
1da177e4 LT |
1815 | rtnl_unlock(); |
1816 | sock_kfree_s(sk, iml, sizeof(*iml)); | |
1817 | return 0; | |
1818 | } | |
1819 | } | |
1820 | rtnl_unlock(); | |
1821 | return -EADDRNOTAVAIL; | |
1822 | } | |
1823 | ||
1824 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1825 | ip_mreq_source *mreqs, int ifindex) | |
1826 | { | |
1827 | int err; | |
1828 | struct ip_mreqn imr; | |
1829 | u32 addr = mreqs->imr_multiaddr; | |
1830 | struct ip_mc_socklist *pmc; | |
1831 | struct in_device *in_dev = NULL; | |
1832 | struct inet_sock *inet = inet_sk(sk); | |
1833 | struct ip_sf_socklist *psl; | |
8cdaaa15 | 1834 | int leavegroup = 0; |
1da177e4 LT |
1835 | int i, j, rv; |
1836 | ||
1837 | if (!MULTICAST(addr)) | |
1838 | return -EINVAL; | |
1839 | ||
1840 | rtnl_shlock(); | |
1841 | ||
1842 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1843 | imr.imr_address.s_addr = mreqs->imr_interface; | |
1844 | imr.imr_ifindex = ifindex; | |
1845 | in_dev = ip_mc_find_dev(&imr); | |
1846 | ||
1847 | if (!in_dev) { | |
1848 | err = -ENODEV; | |
1849 | goto done; | |
1850 | } | |
1851 | err = -EADDRNOTAVAIL; | |
1852 | ||
1853 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
ca9b907d DS |
1854 | if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr |
1855 | && pmc->multi.imr_ifindex == imr.imr_ifindex) | |
1da177e4 LT |
1856 | break; |
1857 | } | |
917f2f10 DS |
1858 | if (!pmc) { /* must have a prior join */ |
1859 | err = -EINVAL; | |
1da177e4 | 1860 | goto done; |
917f2f10 | 1861 | } |
1da177e4 LT |
1862 | /* if a source filter was set, must be the same mode as before */ |
1863 | if (pmc->sflist) { | |
917f2f10 DS |
1864 | if (pmc->sfmode != omode) { |
1865 | err = -EINVAL; | |
1da177e4 | 1866 | goto done; |
917f2f10 | 1867 | } |
1da177e4 LT |
1868 | } else if (pmc->sfmode != omode) { |
1869 | /* allow mode switches for empty-set filters */ | |
1870 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
1871 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, | |
1872 | NULL, 0); | |
1873 | pmc->sfmode = omode; | |
1874 | } | |
1875 | ||
1876 | psl = pmc->sflist; | |
1877 | if (!add) { | |
1878 | if (!psl) | |
917f2f10 | 1879 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 LT |
1880 | rv = !0; |
1881 | for (i=0; i<psl->sl_count; i++) { | |
1882 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
1883 | sizeof(__u32)); | |
1884 | if (rv == 0) | |
1885 | break; | |
1886 | } | |
1887 | if (rv) /* source not found */ | |
917f2f10 | 1888 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 1889 | |
8cdaaa15 DS |
1890 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1891 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
1892 | leavegroup = 1; | |
1893 | goto done; | |
1894 | } | |
1895 | ||
1da177e4 LT |
1896 | /* update the interface filter */ |
1897 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, | |
1898 | &mreqs->imr_sourceaddr, 1); | |
1899 | ||
1900 | for (j=i+1; j<psl->sl_count; j++) | |
1901 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
1902 | psl->sl_count--; | |
1903 | err = 0; | |
1904 | goto done; | |
1905 | } | |
1906 | /* else, add a new source to the filter */ | |
1907 | ||
1908 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
1909 | err = -ENOBUFS; | |
1910 | goto done; | |
1911 | } | |
1912 | if (!psl || psl->sl_count == psl->sl_max) { | |
1913 | struct ip_sf_socklist *newpsl; | |
1914 | int count = IP_SFBLOCK; | |
1915 | ||
1916 | if (psl) | |
1917 | count += psl->sl_max; | |
8b3a7005 | 1918 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
1919 | if (!newpsl) { |
1920 | err = -ENOBUFS; | |
1921 | goto done; | |
1922 | } | |
1923 | newpsl->sl_max = count; | |
1924 | newpsl->sl_count = count - IP_SFBLOCK; | |
1925 | if (psl) { | |
1926 | for (i=0; i<psl->sl_count; i++) | |
1927 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
1928 | sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); | |
1929 | } | |
1930 | pmc->sflist = psl = newpsl; | |
1931 | } | |
1932 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
1933 | for (i=0; i<psl->sl_count; i++) { | |
1934 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
1935 | sizeof(__u32)); | |
1936 | if (rv == 0) | |
1937 | break; | |
1938 | } | |
1939 | if (rv == 0) /* address already there is an error */ | |
1940 | goto done; | |
1941 | for (j=psl->sl_count-1; j>=i; j--) | |
1942 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
1943 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
1944 | psl->sl_count++; | |
1945 | err = 0; | |
1946 | /* update the interface list */ | |
1947 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, | |
1948 | &mreqs->imr_sourceaddr, 1); | |
1949 | done: | |
1950 | rtnl_shunlock(); | |
8cdaaa15 DS |
1951 | if (leavegroup) |
1952 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
1953 | return err; |
1954 | } | |
1955 | ||
1956 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
1957 | { | |
9951f036 | 1958 | int err = 0; |
1da177e4 LT |
1959 | struct ip_mreqn imr; |
1960 | u32 addr = msf->imsf_multiaddr; | |
1961 | struct ip_mc_socklist *pmc; | |
1962 | struct in_device *in_dev; | |
1963 | struct inet_sock *inet = inet_sk(sk); | |
1964 | struct ip_sf_socklist *newpsl, *psl; | |
9951f036 | 1965 | int leavegroup = 0; |
1da177e4 LT |
1966 | |
1967 | if (!MULTICAST(addr)) | |
1968 | return -EINVAL; | |
1969 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
1970 | msf->imsf_fmode != MCAST_EXCLUDE) | |
1971 | return -EINVAL; | |
1972 | ||
1973 | rtnl_shlock(); | |
1974 | ||
1975 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
1976 | imr.imr_address.s_addr = msf->imsf_interface; | |
1977 | imr.imr_ifindex = ifindex; | |
1978 | in_dev = ip_mc_find_dev(&imr); | |
1979 | ||
1980 | if (!in_dev) { | |
1981 | err = -ENODEV; | |
1982 | goto done; | |
1983 | } | |
1da177e4 | 1984 | |
9951f036 DS |
1985 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1986 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
1987 | leavegroup = 1; | |
1988 | goto done; | |
1989 | } | |
1990 | ||
1da177e4 LT |
1991 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { |
1992 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
1993 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
1994 | break; | |
1995 | } | |
917f2f10 DS |
1996 | if (!pmc) { /* must have a prior join */ |
1997 | err = -EINVAL; | |
1da177e4 | 1998 | goto done; |
917f2f10 | 1999 | } |
1da177e4 | 2000 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2001 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2002 | GFP_KERNEL); | |
1da177e4 LT |
2003 | if (!newpsl) { |
2004 | err = -ENOBUFS; | |
2005 | goto done; | |
2006 | } | |
2007 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2008 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2009 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2010 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2011 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2012 | if (err) { | |
2013 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2014 | goto done; | |
2015 | } | |
8713dbf0 | 2016 | } else { |
1da177e4 | 2017 | newpsl = NULL; |
8713dbf0 YZ |
2018 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2019 | msf->imsf_fmode, 0, NULL, 0); | |
2020 | } | |
1da177e4 LT |
2021 | psl = pmc->sflist; |
2022 | if (psl) { | |
2023 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2024 | psl->sl_count, psl->sl_addr, 0); | |
2025 | sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); | |
2026 | } else | |
2027 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2028 | 0, NULL, 0); | |
2029 | pmc->sflist = newpsl; | |
2030 | pmc->sfmode = msf->imsf_fmode; | |
917f2f10 | 2031 | err = 0; |
1da177e4 LT |
2032 | done: |
2033 | rtnl_shunlock(); | |
9951f036 DS |
2034 | if (leavegroup) |
2035 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2036 | return err; |
2037 | } | |
2038 | ||
2039 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2040 | struct ip_msfilter __user *optval, int __user *optlen) | |
2041 | { | |
2042 | int err, len, count, copycount; | |
2043 | struct ip_mreqn imr; | |
2044 | u32 addr = msf->imsf_multiaddr; | |
2045 | struct ip_mc_socklist *pmc; | |
2046 | struct in_device *in_dev; | |
2047 | struct inet_sock *inet = inet_sk(sk); | |
2048 | struct ip_sf_socklist *psl; | |
2049 | ||
2050 | if (!MULTICAST(addr)) | |
2051 | return -EINVAL; | |
2052 | ||
2053 | rtnl_shlock(); | |
2054 | ||
2055 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2056 | imr.imr_address.s_addr = msf->imsf_interface; | |
2057 | imr.imr_ifindex = 0; | |
2058 | in_dev = ip_mc_find_dev(&imr); | |
2059 | ||
2060 | if (!in_dev) { | |
2061 | err = -ENODEV; | |
2062 | goto done; | |
2063 | } | |
2064 | err = -EADDRNOTAVAIL; | |
2065 | ||
2066 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2067 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
2068 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2069 | break; | |
2070 | } | |
2071 | if (!pmc) /* must have a prior join */ | |
2072 | goto done; | |
2073 | msf->imsf_fmode = pmc->sfmode; | |
2074 | psl = pmc->sflist; | |
2075 | rtnl_shunlock(); | |
2076 | if (!psl) { | |
2077 | len = 0; | |
2078 | count = 0; | |
2079 | } else { | |
2080 | count = psl->sl_count; | |
2081 | } | |
2082 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2083 | len = copycount * sizeof(psl->sl_addr[0]); | |
2084 | msf->imsf_numsrc = count; | |
2085 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2086 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2087 | return -EFAULT; | |
2088 | } | |
2089 | if (len && | |
2090 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2091 | return -EFAULT; | |
2092 | return 0; | |
2093 | done: | |
2094 | rtnl_shunlock(); | |
2095 | return err; | |
2096 | } | |
2097 | ||
2098 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2099 | struct group_filter __user *optval, int __user *optlen) | |
2100 | { | |
2101 | int err, i, count, copycount; | |
2102 | struct sockaddr_in *psin; | |
2103 | u32 addr; | |
2104 | struct ip_mc_socklist *pmc; | |
2105 | struct inet_sock *inet = inet_sk(sk); | |
2106 | struct ip_sf_socklist *psl; | |
2107 | ||
2108 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2109 | if (psin->sin_family != AF_INET) | |
2110 | return -EINVAL; | |
2111 | addr = psin->sin_addr.s_addr; | |
2112 | if (!MULTICAST(addr)) | |
2113 | return -EINVAL; | |
2114 | ||
2115 | rtnl_shlock(); | |
2116 | ||
2117 | err = -EADDRNOTAVAIL; | |
2118 | ||
2119 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2120 | if (pmc->multi.imr_multiaddr.s_addr == addr && | |
2121 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2122 | break; | |
2123 | } | |
2124 | if (!pmc) /* must have a prior join */ | |
2125 | goto done; | |
2126 | gsf->gf_fmode = pmc->sfmode; | |
2127 | psl = pmc->sflist; | |
2128 | rtnl_shunlock(); | |
2129 | count = psl ? psl->sl_count : 0; | |
2130 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2131 | gsf->gf_numsrc = count; | |
2132 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2133 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2134 | return -EFAULT; | |
2135 | } | |
2136 | for (i=0; i<copycount; i++) { | |
2137 | struct sockaddr_in *psin; | |
2138 | struct sockaddr_storage ss; | |
2139 | ||
2140 | psin = (struct sockaddr_in *)&ss; | |
2141 | memset(&ss, 0, sizeof(ss)); | |
2142 | psin->sin_family = AF_INET; | |
2143 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2144 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2145 | return -EFAULT; | |
2146 | } | |
2147 | return 0; | |
2148 | done: | |
2149 | rtnl_shunlock(); | |
2150 | return err; | |
2151 | } | |
2152 | ||
2153 | /* | |
2154 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2155 | */ | |
2156 | int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif) | |
2157 | { | |
2158 | struct inet_sock *inet = inet_sk(sk); | |
2159 | struct ip_mc_socklist *pmc; | |
2160 | struct ip_sf_socklist *psl; | |
2161 | int i; | |
2162 | ||
2163 | if (!MULTICAST(loc_addr)) | |
2164 | return 1; | |
2165 | ||
2166 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2167 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && | |
2168 | pmc->multi.imr_ifindex == dif) | |
2169 | break; | |
2170 | } | |
2171 | if (!pmc) | |
2172 | return 1; | |
2173 | psl = pmc->sflist; | |
2174 | if (!psl) | |
2175 | return pmc->sfmode == MCAST_EXCLUDE; | |
2176 | ||
2177 | for (i=0; i<psl->sl_count; i++) { | |
2178 | if (psl->sl_addr[i] == rmt_addr) | |
2179 | break; | |
2180 | } | |
2181 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) | |
2182 | return 0; | |
2183 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) | |
2184 | return 0; | |
2185 | return 1; | |
2186 | } | |
2187 | ||
2188 | /* | |
2189 | * A socket is closing. | |
2190 | */ | |
2191 | ||
2192 | void ip_mc_drop_socket(struct sock *sk) | |
2193 | { | |
2194 | struct inet_sock *inet = inet_sk(sk); | |
2195 | struct ip_mc_socklist *iml; | |
2196 | ||
2197 | if (inet->mc_list == NULL) | |
2198 | return; | |
2199 | ||
2200 | rtnl_lock(); | |
2201 | while ((iml = inet->mc_list) != NULL) { | |
2202 | struct in_device *in_dev; | |
2203 | inet->mc_list = iml->next; | |
2204 | ||
2205 | if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) { | |
2206 | (void) ip_mc_leave_src(sk, iml, in_dev); | |
2207 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); | |
2208 | in_dev_put(in_dev); | |
2209 | } | |
2210 | sock_kfree_s(sk, iml, sizeof(*iml)); | |
2211 | ||
2212 | } | |
2213 | rtnl_unlock(); | |
2214 | } | |
2215 | ||
2216 | int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto) | |
2217 | { | |
2218 | struct ip_mc_list *im; | |
2219 | struct ip_sf_list *psf; | |
2220 | int rv = 0; | |
2221 | ||
2222 | read_lock(&in_dev->mc_list_lock); | |
2223 | for (im=in_dev->mc_list; im; im=im->next) { | |
2224 | if (im->multiaddr == mc_addr) | |
2225 | break; | |
2226 | } | |
2227 | if (im && proto == IPPROTO_IGMP) { | |
2228 | rv = 1; | |
2229 | } else if (im) { | |
2230 | if (src_addr) { | |
2231 | for (psf=im->sources; psf; psf=psf->sf_next) { | |
2232 | if (psf->sf_inaddr == src_addr) | |
2233 | break; | |
2234 | } | |
2235 | if (psf) | |
2236 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2237 | psf->sf_count[MCAST_EXCLUDE] != | |
2238 | im->sfcount[MCAST_EXCLUDE]; | |
2239 | else | |
2240 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2241 | } else | |
2242 | rv = 1; /* unspecified source; tentatively allow */ | |
2243 | } | |
2244 | read_unlock(&in_dev->mc_list_lock); | |
2245 | return rv; | |
2246 | } | |
2247 | ||
2248 | #if defined(CONFIG_PROC_FS) | |
2249 | struct igmp_mc_iter_state { | |
2250 | struct net_device *dev; | |
2251 | struct in_device *in_dev; | |
2252 | }; | |
2253 | ||
2254 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2255 | ||
2256 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2257 | { | |
2258 | struct ip_mc_list *im = NULL; | |
2259 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2260 | ||
2261 | for (state->dev = dev_base, state->in_dev = NULL; | |
2262 | state->dev; | |
2263 | state->dev = state->dev->next) { | |
2264 | struct in_device *in_dev; | |
2265 | in_dev = in_dev_get(state->dev); | |
2266 | if (!in_dev) | |
2267 | continue; | |
2268 | read_lock(&in_dev->mc_list_lock); | |
2269 | im = in_dev->mc_list; | |
2270 | if (im) { | |
2271 | state->in_dev = in_dev; | |
2272 | break; | |
2273 | } | |
2274 | read_unlock(&in_dev->mc_list_lock); | |
2275 | in_dev_put(in_dev); | |
2276 | } | |
2277 | return im; | |
2278 | } | |
2279 | ||
2280 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2281 | { | |
2282 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2283 | im = im->next; | |
2284 | while (!im) { | |
2285 | if (likely(state->in_dev != NULL)) { | |
2286 | read_unlock(&state->in_dev->mc_list_lock); | |
2287 | in_dev_put(state->in_dev); | |
2288 | } | |
2289 | state->dev = state->dev->next; | |
2290 | if (!state->dev) { | |
2291 | state->in_dev = NULL; | |
2292 | break; | |
2293 | } | |
2294 | state->in_dev = in_dev_get(state->dev); | |
2295 | if (!state->in_dev) | |
2296 | continue; | |
2297 | read_lock(&state->in_dev->mc_list_lock); | |
2298 | im = state->in_dev->mc_list; | |
2299 | } | |
2300 | return im; | |
2301 | } | |
2302 | ||
2303 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2304 | { | |
2305 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2306 | if (im) | |
2307 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2308 | --pos; | |
2309 | return pos ? NULL : im; | |
2310 | } | |
2311 | ||
2312 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
2313 | { | |
2314 | read_lock(&dev_base_lock); | |
2315 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2316 | } | |
2317 | ||
2318 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2319 | { | |
2320 | struct ip_mc_list *im; | |
2321 | if (v == SEQ_START_TOKEN) | |
2322 | im = igmp_mc_get_first(seq); | |
2323 | else | |
2324 | im = igmp_mc_get_next(seq, v); | |
2325 | ++*pos; | |
2326 | return im; | |
2327 | } | |
2328 | ||
2329 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
2330 | { | |
2331 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2332 | if (likely(state->in_dev != NULL)) { | |
2333 | read_unlock(&state->in_dev->mc_list_lock); | |
2334 | in_dev_put(state->in_dev); | |
2335 | state->in_dev = NULL; | |
2336 | } | |
2337 | state->dev = NULL; | |
2338 | read_unlock(&dev_base_lock); | |
2339 | } | |
2340 | ||
2341 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2342 | { | |
2343 | if (v == SEQ_START_TOKEN) | |
2344 | seq_puts(seq, | |
2345 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); | |
2346 | else { | |
2347 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2348 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2349 | char *querier; | |
2350 | #ifdef CONFIG_IP_MULTICAST | |
2351 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2352 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2353 | "V3"; | |
2354 | #else | |
2355 | querier = "NONE"; | |
2356 | #endif | |
2357 | ||
2358 | if (state->in_dev->mc_list == im) { | |
2359 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", | |
2360 | state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); | |
2361 | } | |
2362 | ||
2363 | seq_printf(seq, | |
2364 | "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n", | |
2365 | im->multiaddr, im->users, | |
2366 | im->tm_running, im->tm_running ? | |
2367 | jiffies_to_clock_t(im->timer.expires-jiffies) : 0, | |
2368 | im->reporter); | |
2369 | } | |
2370 | return 0; | |
2371 | } | |
2372 | ||
2373 | static struct seq_operations igmp_mc_seq_ops = { | |
2374 | .start = igmp_mc_seq_start, | |
2375 | .next = igmp_mc_seq_next, | |
2376 | .stop = igmp_mc_seq_stop, | |
2377 | .show = igmp_mc_seq_show, | |
2378 | }; | |
2379 | ||
2380 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2381 | { | |
2382 | struct seq_file *seq; | |
2383 | int rc = -ENOMEM; | |
2384 | struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
2385 | ||
2386 | if (!s) | |
2387 | goto out; | |
2388 | rc = seq_open(file, &igmp_mc_seq_ops); | |
2389 | if (rc) | |
2390 | goto out_kfree; | |
2391 | ||
2392 | seq = file->private_data; | |
2393 | seq->private = s; | |
2394 | memset(s, 0, sizeof(*s)); | |
2395 | out: | |
2396 | return rc; | |
2397 | out_kfree: | |
2398 | kfree(s); | |
2399 | goto out; | |
2400 | } | |
2401 | ||
2402 | static struct file_operations igmp_mc_seq_fops = { | |
2403 | .owner = THIS_MODULE, | |
2404 | .open = igmp_mc_seq_open, | |
2405 | .read = seq_read, | |
2406 | .llseek = seq_lseek, | |
2407 | .release = seq_release_private, | |
2408 | }; | |
2409 | ||
2410 | struct igmp_mcf_iter_state { | |
2411 | struct net_device *dev; | |
2412 | struct in_device *idev; | |
2413 | struct ip_mc_list *im; | |
2414 | }; | |
2415 | ||
2416 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2417 | ||
2418 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2419 | { | |
2420 | struct ip_sf_list *psf = NULL; | |
2421 | struct ip_mc_list *im = NULL; | |
2422 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2423 | ||
2424 | for (state->dev = dev_base, state->idev = NULL, state->im = NULL; | |
2425 | state->dev; | |
2426 | state->dev = state->dev->next) { | |
2427 | struct in_device *idev; | |
2428 | idev = in_dev_get(state->dev); | |
2429 | if (unlikely(idev == NULL)) | |
2430 | continue; | |
2431 | read_lock(&idev->mc_list_lock); | |
2432 | im = idev->mc_list; | |
2433 | if (likely(im != NULL)) { | |
2434 | spin_lock_bh(&im->lock); | |
2435 | psf = im->sources; | |
2436 | if (likely(psf != NULL)) { | |
2437 | state->im = im; | |
2438 | state->idev = idev; | |
2439 | break; | |
2440 | } | |
2441 | spin_unlock_bh(&im->lock); | |
2442 | } | |
2443 | read_unlock(&idev->mc_list_lock); | |
2444 | in_dev_put(idev); | |
2445 | } | |
2446 | return psf; | |
2447 | } | |
2448 | ||
2449 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2450 | { | |
2451 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2452 | ||
2453 | psf = psf->sf_next; | |
2454 | while (!psf) { | |
2455 | spin_unlock_bh(&state->im->lock); | |
2456 | state->im = state->im->next; | |
2457 | while (!state->im) { | |
2458 | if (likely(state->idev != NULL)) { | |
2459 | read_unlock(&state->idev->mc_list_lock); | |
2460 | in_dev_put(state->idev); | |
2461 | } | |
2462 | state->dev = state->dev->next; | |
2463 | if (!state->dev) { | |
2464 | state->idev = NULL; | |
2465 | goto out; | |
2466 | } | |
2467 | state->idev = in_dev_get(state->dev); | |
2468 | if (!state->idev) | |
2469 | continue; | |
2470 | read_lock(&state->idev->mc_list_lock); | |
2471 | state->im = state->idev->mc_list; | |
2472 | } | |
2473 | if (!state->im) | |
2474 | break; | |
2475 | spin_lock_bh(&state->im->lock); | |
2476 | psf = state->im->sources; | |
2477 | } | |
2478 | out: | |
2479 | return psf; | |
2480 | } | |
2481 | ||
2482 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2483 | { | |
2484 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2485 | if (psf) | |
2486 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2487 | --pos; | |
2488 | return pos ? NULL : psf; | |
2489 | } | |
2490 | ||
2491 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
2492 | { | |
2493 | read_lock(&dev_base_lock); | |
2494 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2495 | } | |
2496 | ||
2497 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2498 | { | |
2499 | struct ip_sf_list *psf; | |
2500 | if (v == SEQ_START_TOKEN) | |
2501 | psf = igmp_mcf_get_first(seq); | |
2502 | else | |
2503 | psf = igmp_mcf_get_next(seq, v); | |
2504 | ++*pos; | |
2505 | return psf; | |
2506 | } | |
2507 | ||
2508 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
2509 | { | |
2510 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2511 | if (likely(state->im != NULL)) { | |
2512 | spin_unlock_bh(&state->im->lock); | |
2513 | state->im = NULL; | |
2514 | } | |
2515 | if (likely(state->idev != NULL)) { | |
2516 | read_unlock(&state->idev->mc_list_lock); | |
2517 | in_dev_put(state->idev); | |
2518 | state->idev = NULL; | |
2519 | } | |
2520 | state->dev = NULL; | |
2521 | read_unlock(&dev_base_lock); | |
2522 | } | |
2523 | ||
2524 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2525 | { | |
2526 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2527 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2528 | ||
2529 | if (v == SEQ_START_TOKEN) { | |
2530 | seq_printf(seq, | |
2531 | "%3s %6s " | |
2532 | "%10s %10s %6s %6s\n", "Idx", | |
2533 | "Device", "MCA", | |
2534 | "SRC", "INC", "EXC"); | |
2535 | } else { | |
2536 | seq_printf(seq, | |
2537 | "%3d %6.6s 0x%08x " | |
2538 | "0x%08x %6lu %6lu\n", | |
2539 | state->dev->ifindex, state->dev->name, | |
2540 | ntohl(state->im->multiaddr), | |
2541 | ntohl(psf->sf_inaddr), | |
2542 | psf->sf_count[MCAST_INCLUDE], | |
2543 | psf->sf_count[MCAST_EXCLUDE]); | |
2544 | } | |
2545 | return 0; | |
2546 | } | |
2547 | ||
2548 | static struct seq_operations igmp_mcf_seq_ops = { | |
2549 | .start = igmp_mcf_seq_start, | |
2550 | .next = igmp_mcf_seq_next, | |
2551 | .stop = igmp_mcf_seq_stop, | |
2552 | .show = igmp_mcf_seq_show, | |
2553 | }; | |
2554 | ||
2555 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2556 | { | |
2557 | struct seq_file *seq; | |
2558 | int rc = -ENOMEM; | |
2559 | struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
2560 | ||
2561 | if (!s) | |
2562 | goto out; | |
2563 | rc = seq_open(file, &igmp_mcf_seq_ops); | |
2564 | if (rc) | |
2565 | goto out_kfree; | |
2566 | ||
2567 | seq = file->private_data; | |
2568 | seq->private = s; | |
2569 | memset(s, 0, sizeof(*s)); | |
2570 | out: | |
2571 | return rc; | |
2572 | out_kfree: | |
2573 | kfree(s); | |
2574 | goto out; | |
2575 | } | |
2576 | ||
2577 | static struct file_operations igmp_mcf_seq_fops = { | |
2578 | .owner = THIS_MODULE, | |
2579 | .open = igmp_mcf_seq_open, | |
2580 | .read = seq_read, | |
2581 | .llseek = seq_lseek, | |
2582 | .release = seq_release_private, | |
2583 | }; | |
2584 | ||
2585 | int __init igmp_mc_proc_init(void) | |
2586 | { | |
2587 | proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); | |
2588 | proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); | |
2589 | return 0; | |
2590 | } | |
2591 | #endif | |
2592 | ||
2593 | EXPORT_SYMBOL(ip_mc_dec_group); | |
2594 | EXPORT_SYMBOL(ip_mc_inc_group); | |
2595 | EXPORT_SYMBOL(ip_mc_join_group); |