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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; | |
236 | return !(pmc->gsquery && !psf->sf_gsresp); | |
237 | case IGMPV3_CHANGE_TO_INCLUDE: | |
238 | if (gdeleted || sdeleted) | |
239 | return 0; | |
240 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
241 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
242 | if (gdeleted || sdeleted) | |
243 | return 0; | |
244 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
245 | psf->sf_count[MCAST_INCLUDE]) | |
246 | return 0; | |
247 | return pmc->sfcount[MCAST_EXCLUDE] == | |
248 | psf->sf_count[MCAST_EXCLUDE]; | |
249 | case IGMPV3_ALLOW_NEW_SOURCES: | |
250 | if (gdeleted || !psf->sf_crcount) | |
251 | return 0; | |
252 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
253 | case IGMPV3_BLOCK_OLD_SOURCES: | |
254 | if (pmc->sfmode == MCAST_INCLUDE) | |
255 | return gdeleted || (psf->sf_crcount && sdeleted); | |
256 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
257 | } | |
258 | return 0; | |
259 | } | |
260 | ||
261 | static int | |
262 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
263 | { | |
264 | struct ip_sf_list *psf; | |
265 | int scount = 0; | |
266 | ||
267 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
268 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) | |
269 | continue; | |
270 | scount++; | |
271 | } | |
272 | return scount; | |
273 | } | |
274 | ||
275 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) | |
276 | { | |
277 | struct sk_buff *skb; | |
278 | struct rtable *rt; | |
279 | struct iphdr *pip; | |
280 | struct igmpv3_report *pig; | |
281 | ||
282 | skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); | |
283 | if (skb == NULL) | |
284 | return NULL; | |
285 | ||
286 | { | |
287 | struct flowi fl = { .oif = dev->ifindex, | |
288 | .nl_u = { .ip4_u = { | |
289 | .daddr = IGMPV3_ALL_MCR } }, | |
290 | .proto = IPPROTO_IGMP }; | |
291 | if (ip_route_output_key(&rt, &fl)) { | |
292 | kfree_skb(skb); | |
293 | return NULL; | |
294 | } | |
295 | } | |
296 | if (rt->rt_src == 0) { | |
297 | kfree_skb(skb); | |
298 | ip_rt_put(rt); | |
299 | return NULL; | |
300 | } | |
301 | ||
302 | skb->dst = &rt->u.dst; | |
303 | skb->dev = dev; | |
304 | ||
305 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
306 | ||
307 | skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); | |
308 | ||
309 | pip->version = 4; | |
310 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
311 | pip->tos = 0xc0; | |
312 | pip->frag_off = htons(IP_DF); | |
313 | pip->ttl = 1; | |
314 | pip->daddr = rt->rt_dst; | |
315 | pip->saddr = rt->rt_src; | |
316 | pip->protocol = IPPROTO_IGMP; | |
317 | pip->tot_len = 0; /* filled in later */ | |
318 | ip_select_ident(pip, &rt->u.dst, NULL); | |
319 | ((u8*)&pip[1])[0] = IPOPT_RA; | |
320 | ((u8*)&pip[1])[1] = 4; | |
321 | ((u8*)&pip[1])[2] = 0; | |
322 | ((u8*)&pip[1])[3] = 0; | |
323 | ||
324 | pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig)); | |
325 | skb->h.igmph = (struct igmphdr *)pig; | |
326 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
327 | pig->resv1 = 0; | |
328 | pig->csum = 0; | |
329 | pig->resv2 = 0; | |
330 | pig->ngrec = 0; | |
331 | return skb; | |
332 | } | |
333 | ||
334 | static int igmpv3_sendpack(struct sk_buff *skb) | |
335 | { | |
336 | struct iphdr *pip = skb->nh.iph; | |
337 | struct igmphdr *pig = skb->h.igmph; | |
338 | int iplen, igmplen; | |
339 | ||
340 | iplen = skb->tail - (unsigned char *)skb->nh.iph; | |
341 | pip->tot_len = htons(iplen); | |
342 | ip_send_check(pip); | |
343 | ||
344 | igmplen = skb->tail - (unsigned char *)skb->h.igmph; | |
345 | pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen); | |
346 | ||
347 | return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev, | |
348 | dst_output); | |
349 | } | |
350 | ||
351 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
352 | { | |
353 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); | |
354 | } | |
355 | ||
356 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
357 | int type, struct igmpv3_grec **ppgr) | |
358 | { | |
359 | struct net_device *dev = pmc->interface->dev; | |
360 | struct igmpv3_report *pih; | |
361 | struct igmpv3_grec *pgr; | |
362 | ||
363 | if (!skb) | |
364 | skb = igmpv3_newpack(dev, dev->mtu); | |
365 | if (!skb) | |
366 | return NULL; | |
367 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
368 | pgr->grec_type = type; | |
369 | pgr->grec_auxwords = 0; | |
370 | pgr->grec_nsrcs = 0; | |
371 | pgr->grec_mca = pmc->multiaddr; | |
372 | pih = (struct igmpv3_report *)skb->h.igmph; | |
373 | pih->ngrec = htons(ntohs(pih->ngrec)+1); | |
374 | *ppgr = pgr; | |
375 | return skb; | |
376 | } | |
377 | ||
378 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ | |
379 | skb_tailroom(skb)) : 0) | |
380 | ||
381 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
382 | int type, int gdeleted, int sdeleted) | |
383 | { | |
384 | struct net_device *dev = pmc->interface->dev; | |
385 | struct igmpv3_report *pih; | |
386 | struct igmpv3_grec *pgr = NULL; | |
387 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
388 | int scount, first, isquery, truncate; | |
389 | ||
390 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
391 | return skb; | |
392 | ||
393 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
394 | type == IGMPV3_MODE_IS_EXCLUDE; | |
395 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
396 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
397 | ||
398 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; | |
399 | ||
400 | if (!*psf_list) { | |
401 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
402 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
403 | return skb; | |
404 | if (pmc->crcount || isquery) { | |
405 | /* make sure we have room for group header and at | |
406 | * least one source. | |
407 | */ | |
408 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)+ | |
409 | sizeof(__u32)) { | |
410 | igmpv3_sendpack(skb); | |
411 | skb = NULL; /* add_grhead will get a new one */ | |
412 | } | |
413 | skb = add_grhead(skb, pmc, type, &pgr); | |
414 | } | |
415 | return skb; | |
416 | } | |
417 | pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL; | |
418 | ||
419 | /* EX and TO_EX get a fresh packet, if needed */ | |
420 | if (truncate) { | |
421 | if (pih && pih->ngrec && | |
422 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
423 | if (skb) | |
424 | igmpv3_sendpack(skb); | |
425 | skb = igmpv3_newpack(dev, dev->mtu); | |
426 | } | |
427 | } | |
428 | first = 1; | |
429 | scount = 0; | |
430 | psf_prev = NULL; | |
431 | for (psf=*psf_list; psf; psf=psf_next) { | |
432 | u32 *psrc; | |
433 | ||
434 | psf_next = psf->sf_next; | |
435 | ||
436 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
437 | psf_prev = psf; | |
438 | continue; | |
439 | } | |
440 | ||
441 | /* clear marks on query responses */ | |
442 | if (isquery) | |
443 | psf->sf_gsresp = 0; | |
444 | ||
445 | if (AVAILABLE(skb) < sizeof(u32) + | |
446 | first*sizeof(struct igmpv3_grec)) { | |
447 | if (truncate && !first) | |
448 | break; /* truncate these */ | |
449 | if (pgr) | |
450 | pgr->grec_nsrcs = htons(scount); | |
451 | if (skb) | |
452 | igmpv3_sendpack(skb); | |
453 | skb = igmpv3_newpack(dev, dev->mtu); | |
454 | first = 1; | |
455 | scount = 0; | |
456 | } | |
457 | if (first) { | |
458 | skb = add_grhead(skb, pmc, type, &pgr); | |
459 | first = 0; | |
460 | } | |
461 | psrc = (u32 *)skb_put(skb, sizeof(u32)); | |
462 | *psrc = psf->sf_inaddr; | |
463 | scount++; | |
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 | } | |
478 | if (pgr) | |
479 | pgr->grec_nsrcs = htons(scount); | |
480 | ||
481 | if (isquery) | |
482 | pmc->gsquery = 0; /* clear query state on report */ | |
483 | return skb; | |
484 | } | |
485 | ||
486 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
487 | { | |
488 | struct sk_buff *skb = NULL; | |
489 | int type; | |
490 | ||
491 | if (!pmc) { | |
492 | read_lock(&in_dev->mc_list_lock); | |
493 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
494 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
495 | continue; | |
496 | spin_lock_bh(&pmc->lock); | |
497 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
498 | type = IGMPV3_MODE_IS_EXCLUDE; | |
499 | else | |
500 | type = IGMPV3_MODE_IS_INCLUDE; | |
501 | skb = add_grec(skb, pmc, type, 0, 0); | |
502 | spin_unlock_bh(&pmc->lock); | |
503 | } | |
504 | read_unlock(&in_dev->mc_list_lock); | |
505 | } else { | |
506 | spin_lock_bh(&pmc->lock); | |
507 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
508 | type = IGMPV3_MODE_IS_EXCLUDE; | |
509 | else | |
510 | type = IGMPV3_MODE_IS_INCLUDE; | |
511 | skb = add_grec(skb, pmc, type, 0, 0); | |
512 | spin_unlock_bh(&pmc->lock); | |
513 | } | |
514 | if (!skb) | |
515 | return 0; | |
516 | return igmpv3_sendpack(skb); | |
517 | } | |
518 | ||
519 | /* | |
520 | * remove zero-count source records from a source filter list | |
521 | */ | |
522 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
523 | { | |
524 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
525 | ||
526 | psf_prev = NULL; | |
527 | for (psf=*ppsf; psf; psf = psf_next) { | |
528 | psf_next = psf->sf_next; | |
529 | if (psf->sf_crcount == 0) { | |
530 | if (psf_prev) | |
531 | psf_prev->sf_next = psf->sf_next; | |
532 | else | |
533 | *ppsf = psf->sf_next; | |
534 | kfree(psf); | |
535 | } else | |
536 | psf_prev = psf; | |
537 | } | |
538 | } | |
539 | ||
540 | static void igmpv3_send_cr(struct in_device *in_dev) | |
541 | { | |
542 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
543 | struct sk_buff *skb = NULL; | |
544 | int type, dtype; | |
545 | ||
546 | read_lock(&in_dev->mc_list_lock); | |
547 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
548 | ||
549 | /* deleted MCA's */ | |
550 | pmc_prev = NULL; | |
551 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { | |
552 | pmc_next = pmc->next; | |
553 | if (pmc->sfmode == MCAST_INCLUDE) { | |
554 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
555 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
556 | skb = add_grec(skb, pmc, type, 1, 0); | |
557 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
558 | } | |
559 | if (pmc->crcount) { | |
560 | pmc->crcount--; | |
561 | if (pmc->sfmode == MCAST_EXCLUDE) { | |
562 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
563 | skb = add_grec(skb, pmc, type, 1, 0); | |
564 | } | |
565 | if (pmc->crcount == 0) { | |
566 | igmpv3_clear_zeros(&pmc->tomb); | |
567 | igmpv3_clear_zeros(&pmc->sources); | |
568 | } | |
569 | } | |
570 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
571 | if (pmc_prev) | |
572 | pmc_prev->next = pmc_next; | |
573 | else | |
574 | in_dev->mc_tomb = pmc_next; | |
575 | in_dev_put(pmc->interface); | |
576 | kfree(pmc); | |
577 | } else | |
578 | pmc_prev = pmc; | |
579 | } | |
580 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
581 | ||
582 | /* change recs */ | |
583 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
584 | spin_lock_bh(&pmc->lock); | |
585 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
586 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
587 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
588 | } else { | |
589 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
590 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
591 | } | |
592 | skb = add_grec(skb, pmc, type, 0, 0); | |
593 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
594 | ||
595 | /* filter mode changes */ | |
596 | if (pmc->crcount) { | |
597 | pmc->crcount--; | |
598 | if (pmc->sfmode == MCAST_EXCLUDE) | |
599 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
600 | else | |
601 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
602 | skb = add_grec(skb, pmc, type, 0, 0); | |
603 | } | |
604 | spin_unlock_bh(&pmc->lock); | |
605 | } | |
606 | read_unlock(&in_dev->mc_list_lock); | |
607 | ||
608 | if (!skb) | |
609 | return; | |
610 | (void) igmpv3_sendpack(skb); | |
611 | } | |
612 | ||
613 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
614 | int type) | |
615 | { | |
616 | struct sk_buff *skb; | |
617 | struct iphdr *iph; | |
618 | struct igmphdr *ih; | |
619 | struct rtable *rt; | |
620 | struct net_device *dev = in_dev->dev; | |
621 | u32 group = pmc ? pmc->multiaddr : 0; | |
622 | u32 dst; | |
623 | ||
624 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
625 | return igmpv3_send_report(in_dev, pmc); | |
626 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
627 | dst = IGMP_ALL_ROUTER; | |
628 | else | |
629 | dst = group; | |
630 | ||
631 | { | |
632 | struct flowi fl = { .oif = dev->ifindex, | |
633 | .nl_u = { .ip4_u = { .daddr = dst } }, | |
634 | .proto = IPPROTO_IGMP }; | |
635 | if (ip_route_output_key(&rt, &fl)) | |
636 | return -1; | |
637 | } | |
638 | if (rt->rt_src == 0) { | |
639 | ip_rt_put(rt); | |
640 | return -1; | |
641 | } | |
642 | ||
643 | skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); | |
644 | if (skb == NULL) { | |
645 | ip_rt_put(rt); | |
646 | return -1; | |
647 | } | |
648 | ||
649 | skb->dst = &rt->u.dst; | |
650 | ||
651 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
652 | ||
653 | skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); | |
654 | ||
655 | iph->version = 4; | |
656 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
657 | iph->tos = 0xc0; | |
658 | iph->frag_off = htons(IP_DF); | |
659 | iph->ttl = 1; | |
660 | iph->daddr = dst; | |
661 | iph->saddr = rt->rt_src; | |
662 | iph->protocol = IPPROTO_IGMP; | |
663 | iph->tot_len = htons(IGMP_SIZE); | |
664 | ip_select_ident(iph, &rt->u.dst, NULL); | |
665 | ((u8*)&iph[1])[0] = IPOPT_RA; | |
666 | ((u8*)&iph[1])[1] = 4; | |
667 | ((u8*)&iph[1])[2] = 0; | |
668 | ((u8*)&iph[1])[3] = 0; | |
669 | ip_send_check(iph); | |
670 | ||
671 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
672 | ih->type=type; | |
673 | ih->code=0; | |
674 | ih->csum=0; | |
675 | ih->group=group; | |
676 | ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
677 | ||
678 | return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, | |
679 | dst_output); | |
680 | } | |
681 | ||
682 | static void igmp_gq_timer_expire(unsigned long data) | |
683 | { | |
684 | struct in_device *in_dev = (struct in_device *)data; | |
685 | ||
686 | in_dev->mr_gq_running = 0; | |
687 | igmpv3_send_report(in_dev, NULL); | |
688 | __in_dev_put(in_dev); | |
689 | } | |
690 | ||
691 | static void igmp_ifc_timer_expire(unsigned long data) | |
692 | { | |
693 | struct in_device *in_dev = (struct in_device *)data; | |
694 | ||
695 | igmpv3_send_cr(in_dev); | |
696 | if (in_dev->mr_ifc_count) { | |
697 | in_dev->mr_ifc_count--; | |
698 | igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); | |
699 | } | |
700 | __in_dev_put(in_dev); | |
701 | } | |
702 | ||
703 | static void igmp_ifc_event(struct in_device *in_dev) | |
704 | { | |
705 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
706 | return; | |
707 | in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : | |
708 | IGMP_Unsolicited_Report_Count; | |
709 | igmp_ifc_start_timer(in_dev, 1); | |
710 | } | |
711 | ||
712 | ||
713 | static void igmp_timer_expire(unsigned long data) | |
714 | { | |
715 | struct ip_mc_list *im=(struct ip_mc_list *)data; | |
716 | struct in_device *in_dev = im->interface; | |
717 | ||
718 | spin_lock(&im->lock); | |
719 | im->tm_running=0; | |
720 | ||
721 | if (im->unsolicit_count) { | |
722 | im->unsolicit_count--; | |
723 | igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); | |
724 | } | |
725 | im->reporter = 1; | |
726 | spin_unlock(&im->lock); | |
727 | ||
728 | if (IGMP_V1_SEEN(in_dev)) | |
729 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
730 | else if (IGMP_V2_SEEN(in_dev)) | |
731 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
732 | else | |
733 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
734 | ||
735 | ip_ma_put(im); | |
736 | } | |
737 | ||
738 | static void igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs) | |
739 | { | |
740 | struct ip_sf_list *psf; | |
741 | int i, scount; | |
742 | ||
743 | scount = 0; | |
744 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
745 | if (scount == nsrcs) | |
746 | break; | |
747 | for (i=0; i<nsrcs; i++) | |
748 | if (srcs[i] == psf->sf_inaddr) { | |
749 | psf->sf_gsresp = 1; | |
750 | scount++; | |
751 | break; | |
752 | } | |
753 | } | |
754 | } | |
755 | ||
756 | static void igmp_heard_report(struct in_device *in_dev, u32 group) | |
757 | { | |
758 | struct ip_mc_list *im; | |
759 | ||
760 | /* Timers are only set for non-local groups */ | |
761 | ||
762 | if (group == IGMP_ALL_HOSTS) | |
763 | return; | |
764 | ||
765 | read_lock(&in_dev->mc_list_lock); | |
766 | for (im=in_dev->mc_list; im!=NULL; im=im->next) { | |
767 | if (im->multiaddr == group) { | |
768 | igmp_stop_timer(im); | |
769 | break; | |
770 | } | |
771 | } | |
772 | read_unlock(&in_dev->mc_list_lock); | |
773 | } | |
774 | ||
775 | static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
776 | int len) | |
777 | { | |
778 | struct igmphdr *ih = skb->h.igmph; | |
779 | struct igmpv3_query *ih3 = (struct igmpv3_query *)ih; | |
780 | struct ip_mc_list *im; | |
781 | u32 group = ih->group; | |
782 | int max_delay; | |
783 | int mark = 0; | |
784 | ||
785 | ||
786 | if (len == 8) { | |
787 | if (ih->code == 0) { | |
788 | /* Alas, old v1 router presents here. */ | |
789 | ||
790 | max_delay = IGMP_Query_Response_Interval; | |
791 | in_dev->mr_v1_seen = jiffies + | |
792 | IGMP_V1_Router_Present_Timeout; | |
793 | group = 0; | |
794 | } else { | |
795 | /* v2 router present */ | |
796 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
797 | in_dev->mr_v2_seen = jiffies + | |
798 | IGMP_V2_Router_Present_Timeout; | |
799 | } | |
800 | /* cancel the interface change timer */ | |
801 | in_dev->mr_ifc_count = 0; | |
802 | if (del_timer(&in_dev->mr_ifc_timer)) | |
803 | __in_dev_put(in_dev); | |
804 | /* clear deleted report items */ | |
805 | igmpv3_clear_delrec(in_dev); | |
806 | } else if (len < 12) { | |
807 | return; /* ignore bogus packet; freed by caller */ | |
808 | } else { /* v3 */ | |
809 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
810 | return; | |
811 | ||
812 | ih3 = (struct igmpv3_query *) skb->h.raw; | |
813 | if (ih3->nsrcs) { | |
814 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) | |
815 | + ntohs(ih3->nsrcs)*sizeof(__u32))) | |
816 | return; | |
817 | ih3 = (struct igmpv3_query *) skb->h.raw; | |
818 | } | |
819 | ||
820 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
821 | if (!max_delay) | |
822 | max_delay = 1; /* can't mod w/ 0 */ | |
823 | in_dev->mr_maxdelay = max_delay; | |
824 | if (ih3->qrv) | |
825 | in_dev->mr_qrv = ih3->qrv; | |
826 | if (!group) { /* general query */ | |
827 | if (ih3->nsrcs) | |
828 | return; /* no sources allowed */ | |
829 | igmp_gq_start_timer(in_dev); | |
830 | return; | |
831 | } | |
832 | /* mark sources to include, if group & source-specific */ | |
833 | mark = ih3->nsrcs != 0; | |
834 | } | |
835 | ||
836 | /* | |
837 | * - Start the timers in all of our membership records | |
838 | * that the query applies to for the interface on | |
839 | * which the query arrived excl. those that belong | |
840 | * to a "local" group (224.0.0.X) | |
841 | * - For timers already running check if they need to | |
842 | * be reset. | |
843 | * - Use the igmp->igmp_code field as the maximum | |
844 | * delay possible | |
845 | */ | |
846 | read_lock(&in_dev->mc_list_lock); | |
847 | for (im=in_dev->mc_list; im!=NULL; im=im->next) { | |
848 | if (group && group != im->multiaddr) | |
849 | continue; | |
850 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
851 | continue; | |
852 | spin_lock_bh(&im->lock); | |
853 | if (im->tm_running) | |
854 | im->gsquery = im->gsquery && mark; | |
855 | else | |
856 | im->gsquery = mark; | |
857 | if (im->gsquery) | |
858 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); | |
859 | spin_unlock_bh(&im->lock); | |
860 | igmp_mod_timer(im, max_delay); | |
861 | } | |
862 | read_unlock(&in_dev->mc_list_lock); | |
863 | } | |
864 | ||
865 | int igmp_rcv(struct sk_buff *skb) | |
866 | { | |
867 | /* This basically follows the spec line by line -- see RFC1112 */ | |
868 | struct igmphdr *ih; | |
869 | struct in_device *in_dev = in_dev_get(skb->dev); | |
870 | int len = skb->len; | |
871 | ||
872 | if (in_dev==NULL) { | |
873 | kfree_skb(skb); | |
874 | return 0; | |
875 | } | |
876 | ||
fb286bb2 HX |
877 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
878 | goto drop; | |
879 | ||
880 | switch (skb->ip_summed) { | |
881 | case CHECKSUM_HW: | |
882 | if (!(u16)csum_fold(skb->csum)) | |
883 | break; | |
884 | /* fall through */ | |
885 | case CHECKSUM_NONE: | |
886 | skb->csum = 0; | |
887 | if (__skb_checksum_complete(skb)) | |
888 | goto drop; | |
1da177e4 LT |
889 | } |
890 | ||
891 | ih = skb->h.igmph; | |
892 | switch (ih->type) { | |
893 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
894 | igmp_heard_query(in_dev, skb, len); | |
895 | break; | |
896 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
897 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
898 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
899 | /* Is it our report looped back? */ | |
900 | if (((struct rtable*)skb->dst)->fl.iif == 0) | |
901 | break; | |
24c69275 DS |
902 | /* don't rely on MC router hearing unicast reports */ |
903 | if (skb->pkt_type == PACKET_MULTICAST || | |
904 | skb->pkt_type == PACKET_BROADCAST) | |
905 | igmp_heard_report(in_dev, ih->group); | |
1da177e4 LT |
906 | break; |
907 | case IGMP_PIM: | |
908 | #ifdef CONFIG_IP_PIMSM_V1 | |
909 | in_dev_put(in_dev); | |
910 | return pim_rcv_v1(skb); | |
911 | #endif | |
912 | case IGMP_DVMRP: | |
913 | case IGMP_TRACE: | |
914 | case IGMP_HOST_LEAVE_MESSAGE: | |
915 | case IGMP_MTRACE: | |
916 | case IGMP_MTRACE_RESP: | |
917 | break; | |
918 | default: | |
64ce2073 | 919 | NETDEBUG(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type); |
1da177e4 | 920 | } |
fb286bb2 HX |
921 | |
922 | drop: | |
1da177e4 LT |
923 | in_dev_put(in_dev); |
924 | kfree_skb(skb); | |
925 | return 0; | |
926 | } | |
927 | ||
928 | #endif | |
929 | ||
930 | ||
931 | /* | |
932 | * Add a filter to a device | |
933 | */ | |
934 | ||
935 | static void ip_mc_filter_add(struct in_device *in_dev, u32 addr) | |
936 | { | |
937 | char buf[MAX_ADDR_LEN]; | |
938 | struct net_device *dev = in_dev->dev; | |
939 | ||
940 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
941 | We will get multicast token leakage, when IFF_MULTICAST | |
942 | is changed. This check should be done in dev->set_multicast_list | |
943 | routine. Something sort of: | |
944 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
945 | --ANK | |
946 | */ | |
947 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
948 | dev_mc_add(dev,buf,dev->addr_len,0); | |
949 | } | |
950 | ||
951 | /* | |
952 | * Remove a filter from a device | |
953 | */ | |
954 | ||
955 | static void ip_mc_filter_del(struct in_device *in_dev, u32 addr) | |
956 | { | |
957 | char buf[MAX_ADDR_LEN]; | |
958 | struct net_device *dev = in_dev->dev; | |
959 | ||
960 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
961 | dev_mc_delete(dev,buf,dev->addr_len,0); | |
962 | } | |
963 | ||
964 | #ifdef CONFIG_IP_MULTICAST | |
965 | /* | |
966 | * deleted ip_mc_list manipulation | |
967 | */ | |
968 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
969 | { | |
970 | struct ip_mc_list *pmc; | |
971 | ||
972 | /* this is an "ip_mc_list" for convenience; only the fields below | |
973 | * are actually used. In particular, the refcnt and users are not | |
974 | * used for management of the delete list. Using the same structure | |
975 | * for deleted items allows change reports to use common code with | |
976 | * non-deleted or query-response MCA's. | |
977 | */ | |
8b3a7005 | 978 | pmc = kmalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
979 | if (!pmc) |
980 | return; | |
981 | memset(pmc, 0, sizeof(*pmc)); | |
982 | spin_lock_bh(&im->lock); | |
983 | pmc->interface = im->interface; | |
984 | in_dev_hold(in_dev); | |
985 | pmc->multiaddr = im->multiaddr; | |
986 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
987 | IGMP_Unsolicited_Report_Count; | |
988 | pmc->sfmode = im->sfmode; | |
989 | if (pmc->sfmode == MCAST_INCLUDE) { | |
990 | struct ip_sf_list *psf; | |
991 | ||
992 | pmc->tomb = im->tomb; | |
993 | pmc->sources = im->sources; | |
994 | im->tomb = im->sources = NULL; | |
995 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
996 | psf->sf_crcount = pmc->crcount; | |
997 | } | |
998 | spin_unlock_bh(&im->lock); | |
999 | ||
1000 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1001 | pmc->next = in_dev->mc_tomb; | |
1002 | in_dev->mc_tomb = pmc; | |
1003 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1004 | } | |
1005 | ||
1006 | static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr) | |
1007 | { | |
1008 | struct ip_mc_list *pmc, *pmc_prev; | |
1009 | struct ip_sf_list *psf, *psf_next; | |
1010 | ||
1011 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1012 | pmc_prev = NULL; | |
1013 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { | |
1014 | if (pmc->multiaddr == multiaddr) | |
1015 | break; | |
1016 | pmc_prev = pmc; | |
1017 | } | |
1018 | if (pmc) { | |
1019 | if (pmc_prev) | |
1020 | pmc_prev->next = pmc->next; | |
1021 | else | |
1022 | in_dev->mc_tomb = pmc->next; | |
1023 | } | |
1024 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1025 | if (pmc) { | |
1026 | for (psf=pmc->tomb; psf; psf=psf_next) { | |
1027 | psf_next = psf->sf_next; | |
1028 | kfree(psf); | |
1029 | } | |
1030 | in_dev_put(pmc->interface); | |
1031 | kfree(pmc); | |
1032 | } | |
1033 | } | |
1034 | ||
1035 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1036 | { | |
1037 | struct ip_mc_list *pmc, *nextpmc; | |
1038 | ||
1039 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1040 | pmc = in_dev->mc_tomb; | |
1041 | in_dev->mc_tomb = NULL; | |
1042 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1043 | ||
1044 | for (; pmc; pmc = nextpmc) { | |
1045 | nextpmc = pmc->next; | |
1046 | ip_mc_clear_src(pmc); | |
1047 | in_dev_put(pmc->interface); | |
1048 | kfree(pmc); | |
1049 | } | |
1050 | /* clear dead sources, too */ | |
1051 | read_lock(&in_dev->mc_list_lock); | |
1052 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1053 | struct ip_sf_list *psf, *psf_next; | |
1054 | ||
1055 | spin_lock_bh(&pmc->lock); | |
1056 | psf = pmc->tomb; | |
1057 | pmc->tomb = NULL; | |
1058 | spin_unlock_bh(&pmc->lock); | |
1059 | for (; psf; psf=psf_next) { | |
1060 | psf_next = psf->sf_next; | |
1061 | kfree(psf); | |
1062 | } | |
1063 | } | |
1064 | read_unlock(&in_dev->mc_list_lock); | |
1065 | } | |
1066 | #endif | |
1067 | ||
1068 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1069 | { | |
1070 | struct in_device *in_dev = im->interface; | |
1071 | #ifdef CONFIG_IP_MULTICAST | |
1072 | int reporter; | |
1073 | #endif | |
1074 | ||
1075 | if (im->loaded) { | |
1076 | im->loaded = 0; | |
1077 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1078 | } | |
1079 | ||
1080 | #ifdef CONFIG_IP_MULTICAST | |
1081 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1082 | return; | |
1083 | ||
1084 | reporter = im->reporter; | |
1085 | igmp_stop_timer(im); | |
1086 | ||
1087 | if (!in_dev->dead) { | |
1088 | if (IGMP_V1_SEEN(in_dev)) | |
1089 | goto done; | |
1090 | if (IGMP_V2_SEEN(in_dev)) { | |
1091 | if (reporter) | |
1092 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
1093 | goto done; | |
1094 | } | |
1095 | /* IGMPv3 */ | |
1096 | igmpv3_add_delrec(in_dev, im); | |
1097 | ||
1098 | igmp_ifc_event(in_dev); | |
1099 | } | |
1100 | done: | |
1101 | #endif | |
1102 | ip_mc_clear_src(im); | |
1103 | } | |
1104 | ||
1105 | static void igmp_group_added(struct ip_mc_list *im) | |
1106 | { | |
1107 | struct in_device *in_dev = im->interface; | |
1108 | ||
1109 | if (im->loaded == 0) { | |
1110 | im->loaded = 1; | |
1111 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1112 | } | |
1113 | ||
1114 | #ifdef CONFIG_IP_MULTICAST | |
1115 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1116 | return; | |
1117 | ||
1118 | if (in_dev->dead) | |
1119 | return; | |
1120 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1121 | spin_lock_bh(&im->lock); | |
1122 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1123 | spin_unlock_bh(&im->lock); | |
1124 | return; | |
1125 | } | |
1126 | /* else, v3 */ | |
1127 | ||
1128 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1129 | IGMP_Unsolicited_Report_Count; | |
1130 | igmp_ifc_event(in_dev); | |
1131 | #endif | |
1132 | } | |
1133 | ||
1134 | ||
1135 | /* | |
1136 | * Multicast list managers | |
1137 | */ | |
1138 | ||
1139 | ||
1140 | /* | |
1141 | * A socket has joined a multicast group on device dev. | |
1142 | */ | |
1143 | ||
1144 | void ip_mc_inc_group(struct in_device *in_dev, u32 addr) | |
1145 | { | |
1146 | struct ip_mc_list *im; | |
1147 | ||
1148 | ASSERT_RTNL(); | |
1149 | ||
1150 | for (im=in_dev->mc_list; im; im=im->next) { | |
1151 | if (im->multiaddr == addr) { | |
1152 | im->users++; | |
1153 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1154 | goto out; | |
1155 | } | |
1156 | } | |
1157 | ||
8b3a7005 | 1158 | im = kmalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1159 | if (!im) |
1160 | goto out; | |
1161 | ||
1162 | im->users=1; | |
1163 | im->interface=in_dev; | |
1164 | in_dev_hold(in_dev); | |
1165 | im->multiaddr=addr; | |
1166 | /* initial mode is (EX, empty) */ | |
1167 | im->sfmode = MCAST_EXCLUDE; | |
1168 | im->sfcount[MCAST_INCLUDE] = 0; | |
1169 | im->sfcount[MCAST_EXCLUDE] = 1; | |
1170 | im->sources = NULL; | |
1171 | im->tomb = NULL; | |
1172 | im->crcount = 0; | |
1173 | atomic_set(&im->refcnt, 1); | |
1174 | spin_lock_init(&im->lock); | |
1175 | #ifdef CONFIG_IP_MULTICAST | |
1176 | im->tm_running=0; | |
1177 | init_timer(&im->timer); | |
1178 | im->timer.data=(unsigned long)im; | |
1179 | im->timer.function=&igmp_timer_expire; | |
1180 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; | |
1181 | im->reporter = 0; | |
1182 | im->gsquery = 0; | |
1183 | #endif | |
1184 | im->loaded = 0; | |
1185 | write_lock_bh(&in_dev->mc_list_lock); | |
1186 | im->next=in_dev->mc_list; | |
1187 | in_dev->mc_list=im; | |
1188 | write_unlock_bh(&in_dev->mc_list_lock); | |
1189 | #ifdef CONFIG_IP_MULTICAST | |
1190 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1191 | #endif | |
1192 | igmp_group_added(im); | |
1193 | if (!in_dev->dead) | |
1194 | ip_rt_multicast_event(in_dev); | |
1195 | out: | |
1196 | return; | |
1197 | } | |
1198 | ||
1199 | /* | |
1200 | * A socket has left a multicast group on device dev | |
1201 | */ | |
1202 | ||
1203 | void ip_mc_dec_group(struct in_device *in_dev, u32 addr) | |
1204 | { | |
1205 | struct ip_mc_list *i, **ip; | |
1206 | ||
1207 | ASSERT_RTNL(); | |
1208 | ||
1209 | for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { | |
1210 | if (i->multiaddr==addr) { | |
1211 | if (--i->users == 0) { | |
1212 | write_lock_bh(&in_dev->mc_list_lock); | |
1213 | *ip = i->next; | |
1214 | write_unlock_bh(&in_dev->mc_list_lock); | |
1215 | igmp_group_dropped(i); | |
1216 | ||
1217 | if (!in_dev->dead) | |
1218 | ip_rt_multicast_event(in_dev); | |
1219 | ||
1220 | ip_ma_put(i); | |
1221 | return; | |
1222 | } | |
1223 | break; | |
1224 | } | |
1225 | } | |
1226 | } | |
1227 | ||
1228 | /* Device going down */ | |
1229 | ||
1230 | void ip_mc_down(struct in_device *in_dev) | |
1231 | { | |
1232 | struct ip_mc_list *i; | |
1233 | ||
1234 | ASSERT_RTNL(); | |
1235 | ||
1236 | for (i=in_dev->mc_list; i; i=i->next) | |
1237 | igmp_group_dropped(i); | |
1238 | ||
1239 | #ifdef CONFIG_IP_MULTICAST | |
1240 | in_dev->mr_ifc_count = 0; | |
1241 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1242 | __in_dev_put(in_dev); | |
1243 | in_dev->mr_gq_running = 0; | |
1244 | if (del_timer(&in_dev->mr_gq_timer)) | |
1245 | __in_dev_put(in_dev); | |
1246 | igmpv3_clear_delrec(in_dev); | |
1247 | #endif | |
1248 | ||
1249 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1250 | } | |
1251 | ||
1252 | void ip_mc_init_dev(struct in_device *in_dev) | |
1253 | { | |
1254 | ASSERT_RTNL(); | |
1255 | ||
1256 | in_dev->mc_tomb = NULL; | |
1257 | #ifdef CONFIG_IP_MULTICAST | |
1258 | in_dev->mr_gq_running = 0; | |
1259 | init_timer(&in_dev->mr_gq_timer); | |
1260 | in_dev->mr_gq_timer.data=(unsigned long) in_dev; | |
1261 | in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; | |
1262 | in_dev->mr_ifc_count = 0; | |
1263 | init_timer(&in_dev->mr_ifc_timer); | |
1264 | in_dev->mr_ifc_timer.data=(unsigned long) in_dev; | |
1265 | in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; | |
1266 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; | |
1267 | #endif | |
1268 | ||
1269 | rwlock_init(&in_dev->mc_list_lock); | |
1270 | spin_lock_init(&in_dev->mc_tomb_lock); | |
1271 | } | |
1272 | ||
1273 | /* Device going up */ | |
1274 | ||
1275 | void ip_mc_up(struct in_device *in_dev) | |
1276 | { | |
1277 | struct ip_mc_list *i; | |
1278 | ||
1279 | ASSERT_RTNL(); | |
1280 | ||
1281 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1282 | ||
1283 | for (i=in_dev->mc_list; i; i=i->next) | |
1284 | igmp_group_added(i); | |
1285 | } | |
1286 | ||
1287 | /* | |
1288 | * Device is about to be destroyed: clean up. | |
1289 | */ | |
1290 | ||
1291 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1292 | { | |
1293 | struct ip_mc_list *i; | |
1294 | ||
1295 | ASSERT_RTNL(); | |
1296 | ||
1297 | /* Deactivate timers */ | |
1298 | ip_mc_down(in_dev); | |
1299 | ||
1300 | write_lock_bh(&in_dev->mc_list_lock); | |
1301 | while ((i = in_dev->mc_list) != NULL) { | |
1302 | in_dev->mc_list = i->next; | |
1303 | write_unlock_bh(&in_dev->mc_list_lock); | |
1304 | ||
1305 | igmp_group_dropped(i); | |
1306 | ip_ma_put(i); | |
1307 | ||
1308 | write_lock_bh(&in_dev->mc_list_lock); | |
1309 | } | |
1310 | write_unlock_bh(&in_dev->mc_list_lock); | |
1311 | } | |
1312 | ||
1313 | static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) | |
1314 | { | |
1315 | struct flowi fl = { .nl_u = { .ip4_u = | |
1316 | { .daddr = imr->imr_multiaddr.s_addr } } }; | |
1317 | struct rtable *rt; | |
1318 | struct net_device *dev = NULL; | |
1319 | struct in_device *idev = NULL; | |
1320 | ||
1321 | if (imr->imr_ifindex) { | |
1322 | idev = inetdev_by_index(imr->imr_ifindex); | |
1323 | if (idev) | |
1324 | __in_dev_put(idev); | |
1325 | return idev; | |
1326 | } | |
1327 | if (imr->imr_address.s_addr) { | |
1328 | dev = ip_dev_find(imr->imr_address.s_addr); | |
1329 | if (!dev) | |
1330 | return NULL; | |
1331 | __dev_put(dev); | |
1332 | } | |
1333 | ||
1334 | if (!dev && !ip_route_output_key(&rt, &fl)) { | |
1335 | dev = rt->u.dst.dev; | |
1336 | ip_rt_put(rt); | |
1337 | } | |
1338 | if (dev) { | |
1339 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1340 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1341 | } |
1342 | return idev; | |
1343 | } | |
1344 | ||
1345 | /* | |
1346 | * Join a socket to a group | |
1347 | */ | |
1348 | int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS; | |
1349 | int sysctl_igmp_max_msf = IP_MAX_MSF; | |
1350 | ||
1351 | ||
1352 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
1353 | __u32 *psfsrc) | |
1354 | { | |
1355 | struct ip_sf_list *psf, *psf_prev; | |
1356 | int rv = 0; | |
1357 | ||
1358 | psf_prev = NULL; | |
1359 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1360 | if (psf->sf_inaddr == *psfsrc) | |
1361 | break; | |
1362 | psf_prev = psf; | |
1363 | } | |
1364 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1365 | /* source filter not found, or count wrong => bug */ | |
1366 | return -ESRCH; | |
1367 | } | |
1368 | psf->sf_count[sfmode]--; | |
1369 | if (psf->sf_count[sfmode] == 0) { | |
1370 | ip_rt_multicast_event(pmc->interface); | |
1371 | } | |
1372 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1373 | #ifdef CONFIG_IP_MULTICAST | |
1374 | struct in_device *in_dev = pmc->interface; | |
1375 | #endif | |
1376 | ||
1377 | /* no more filters for this source */ | |
1378 | if (psf_prev) | |
1379 | psf_prev->sf_next = psf->sf_next; | |
1380 | else | |
1381 | pmc->sources = psf->sf_next; | |
1382 | #ifdef CONFIG_IP_MULTICAST | |
1383 | if (psf->sf_oldin && | |
1384 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
1385 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1386 | IGMP_Unsolicited_Report_Count; | |
1387 | psf->sf_next = pmc->tomb; | |
1388 | pmc->tomb = psf; | |
1389 | rv = 1; | |
1390 | } else | |
1391 | #endif | |
1392 | kfree(psf); | |
1393 | } | |
1394 | return rv; | |
1395 | } | |
1396 | ||
1397 | #ifndef CONFIG_IP_MULTICAST | |
1398 | #define igmp_ifc_event(x) do { } while (0) | |
1399 | #endif | |
1400 | ||
1401 | static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode, | |
1402 | int sfcount, __u32 *psfsrc, int delta) | |
1403 | { | |
1404 | struct ip_mc_list *pmc; | |
1405 | int changerec = 0; | |
1406 | int i, err; | |
1407 | ||
1408 | if (!in_dev) | |
1409 | return -ENODEV; | |
1410 | read_lock(&in_dev->mc_list_lock); | |
1411 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1412 | if (*pmca == pmc->multiaddr) | |
1413 | break; | |
1414 | } | |
1415 | if (!pmc) { | |
1416 | /* MCA not found?? bug */ | |
1417 | read_unlock(&in_dev->mc_list_lock); | |
1418 | return -ESRCH; | |
1419 | } | |
1420 | spin_lock_bh(&pmc->lock); | |
1421 | read_unlock(&in_dev->mc_list_lock); | |
1422 | #ifdef CONFIG_IP_MULTICAST | |
1423 | sf_markstate(pmc); | |
1424 | #endif | |
1425 | if (!delta) { | |
1426 | err = -EINVAL; | |
1427 | if (!pmc->sfcount[sfmode]) | |
1428 | goto out_unlock; | |
1429 | pmc->sfcount[sfmode]--; | |
1430 | } | |
1431 | err = 0; | |
1432 | for (i=0; i<sfcount; i++) { | |
1433 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1434 | ||
1435 | changerec |= rv > 0; | |
1436 | if (!err && rv < 0) | |
1437 | err = rv; | |
1438 | } | |
1439 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1440 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1441 | pmc->sfcount[MCAST_INCLUDE]) { | |
1442 | #ifdef CONFIG_IP_MULTICAST | |
1443 | struct ip_sf_list *psf; | |
1444 | #endif | |
1445 | ||
1446 | /* filter mode change */ | |
1447 | pmc->sfmode = MCAST_INCLUDE; | |
1448 | #ifdef CONFIG_IP_MULTICAST | |
1449 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1450 | IGMP_Unsolicited_Report_Count; | |
1451 | in_dev->mr_ifc_count = pmc->crcount; | |
1452 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1453 | psf->sf_crcount = 0; | |
1454 | igmp_ifc_event(pmc->interface); | |
1455 | } else if (sf_setstate(pmc) || changerec) { | |
1456 | igmp_ifc_event(pmc->interface); | |
1457 | #endif | |
1458 | } | |
1459 | out_unlock: | |
1460 | spin_unlock_bh(&pmc->lock); | |
1461 | return err; | |
1462 | } | |
1463 | ||
1464 | /* | |
1465 | * Add multicast single-source filter to the interface list | |
1466 | */ | |
1467 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
1468 | __u32 *psfsrc, int delta) | |
1469 | { | |
1470 | struct ip_sf_list *psf, *psf_prev; | |
1471 | ||
1472 | psf_prev = NULL; | |
1473 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1474 | if (psf->sf_inaddr == *psfsrc) | |
1475 | break; | |
1476 | psf_prev = psf; | |
1477 | } | |
1478 | if (!psf) { | |
8b3a7005 | 1479 | psf = kmalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1480 | if (!psf) |
1481 | return -ENOBUFS; | |
1482 | memset(psf, 0, sizeof(*psf)); | |
1483 | psf->sf_inaddr = *psfsrc; | |
1484 | if (psf_prev) { | |
1485 | psf_prev->sf_next = psf; | |
1486 | } else | |
1487 | pmc->sources = psf; | |
1488 | } | |
1489 | psf->sf_count[sfmode]++; | |
1490 | if (psf->sf_count[sfmode] == 1) { | |
1491 | ip_rt_multicast_event(pmc->interface); | |
1492 | } | |
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | #ifdef CONFIG_IP_MULTICAST | |
1497 | static void sf_markstate(struct ip_mc_list *pmc) | |
1498 | { | |
1499 | struct ip_sf_list *psf; | |
1500 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1501 | ||
1502 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1503 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1504 | psf->sf_oldin = mca_xcount == | |
1505 | psf->sf_count[MCAST_EXCLUDE] && | |
1506 | !psf->sf_count[MCAST_INCLUDE]; | |
1507 | } else | |
1508 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1509 | } | |
1510 | ||
1511 | static int sf_setstate(struct ip_mc_list *pmc) | |
1512 | { | |
1513 | struct ip_sf_list *psf; | |
1514 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1515 | int qrv = pmc->interface->mr_qrv; | |
1516 | int new_in, rv; | |
1517 | ||
1518 | rv = 0; | |
1519 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1520 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1521 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1522 | !psf->sf_count[MCAST_INCLUDE]; | |
1523 | } else | |
1524 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
1525 | if (new_in != psf->sf_oldin) { | |
1526 | psf->sf_crcount = qrv; | |
1527 | rv++; | |
1528 | } | |
1529 | } | |
1530 | return rv; | |
1531 | } | |
1532 | #endif | |
1533 | ||
1534 | /* | |
1535 | * Add multicast source filter list to the interface list | |
1536 | */ | |
1537 | static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, | |
1538 | int sfcount, __u32 *psfsrc, int delta) | |
1539 | { | |
1540 | struct ip_mc_list *pmc; | |
1541 | int isexclude; | |
1542 | int i, err; | |
1543 | ||
1544 | if (!in_dev) | |
1545 | return -ENODEV; | |
1546 | read_lock(&in_dev->mc_list_lock); | |
1547 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1548 | if (*pmca == pmc->multiaddr) | |
1549 | break; | |
1550 | } | |
1551 | if (!pmc) { | |
1552 | /* MCA not found?? bug */ | |
1553 | read_unlock(&in_dev->mc_list_lock); | |
1554 | return -ESRCH; | |
1555 | } | |
1556 | spin_lock_bh(&pmc->lock); | |
1557 | read_unlock(&in_dev->mc_list_lock); | |
1558 | ||
1559 | #ifdef CONFIG_IP_MULTICAST | |
1560 | sf_markstate(pmc); | |
1561 | #endif | |
1562 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1563 | if (!delta) | |
1564 | pmc->sfcount[sfmode]++; | |
1565 | err = 0; | |
1566 | for (i=0; i<sfcount; i++) { | |
1567 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); | |
1568 | if (err) | |
1569 | break; | |
1570 | } | |
1571 | if (err) { | |
1572 | int j; | |
1573 | ||
1574 | pmc->sfcount[sfmode]--; | |
1575 | for (j=0; j<i; j++) | |
1576 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1577 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { | |
1578 | #ifdef CONFIG_IP_MULTICAST | |
1579 | struct in_device *in_dev = pmc->interface; | |
1580 | struct ip_sf_list *psf; | |
1581 | #endif | |
1582 | ||
1583 | /* filter mode change */ | |
1584 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1585 | pmc->sfmode = MCAST_EXCLUDE; | |
1586 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1587 | pmc->sfmode = MCAST_INCLUDE; | |
1588 | #ifdef CONFIG_IP_MULTICAST | |
1589 | /* else no filters; keep old mode for reports */ | |
1590 | ||
1591 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1592 | IGMP_Unsolicited_Report_Count; | |
1593 | in_dev->mr_ifc_count = pmc->crcount; | |
1594 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1595 | psf->sf_crcount = 0; | |
1596 | igmp_ifc_event(in_dev); | |
1597 | } else if (sf_setstate(pmc)) { | |
1598 | igmp_ifc_event(in_dev); | |
1599 | #endif | |
1600 | } | |
1601 | spin_unlock_bh(&pmc->lock); | |
1602 | return err; | |
1603 | } | |
1604 | ||
1605 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1606 | { | |
1607 | struct ip_sf_list *psf, *nextpsf; | |
1608 | ||
1609 | for (psf=pmc->tomb; psf; psf=nextpsf) { | |
1610 | nextpsf = psf->sf_next; | |
1611 | kfree(psf); | |
1612 | } | |
1613 | pmc->tomb = NULL; | |
1614 | for (psf=pmc->sources; psf; psf=nextpsf) { | |
1615 | nextpsf = psf->sf_next; | |
1616 | kfree(psf); | |
1617 | } | |
1618 | pmc->sources = NULL; | |
1619 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1620 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1621 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1622 | } | |
1623 | ||
1624 | ||
1625 | /* | |
1626 | * Join a multicast group | |
1627 | */ | |
1628 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1629 | { | |
1630 | int err; | |
1631 | u32 addr = imr->imr_multiaddr.s_addr; | |
ca9b907d | 1632 | struct ip_mc_socklist *iml=NULL, *i; |
1da177e4 LT |
1633 | struct in_device *in_dev; |
1634 | struct inet_sock *inet = inet_sk(sk); | |
ca9b907d | 1635 | int ifindex; |
1da177e4 LT |
1636 | int count = 0; |
1637 | ||
1638 | if (!MULTICAST(addr)) | |
1639 | return -EINVAL; | |
1640 | ||
1641 | rtnl_shlock(); | |
1642 | ||
1643 | in_dev = ip_mc_find_dev(imr); | |
1644 | ||
1645 | if (!in_dev) { | |
1646 | iml = NULL; | |
1647 | err = -ENODEV; | |
1648 | goto done; | |
1649 | } | |
1650 | ||
1da177e4 | 1651 | err = -EADDRINUSE; |
ca9b907d | 1652 | ifindex = imr->imr_ifindex; |
1da177e4 | 1653 | for (i = inet->mc_list; i; i = i->next) { |
ca9b907d DS |
1654 | if (i->multi.imr_multiaddr.s_addr == addr && |
1655 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1656 | goto done; |
1da177e4 LT |
1657 | count++; |
1658 | } | |
1659 | err = -ENOBUFS; | |
ca9b907d DS |
1660 | if (count >= sysctl_igmp_max_memberships) |
1661 | goto done; | |
8b3a7005 | 1662 | iml = sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); |
ca9b907d | 1663 | if (iml == NULL) |
1da177e4 | 1664 | goto done; |
ca9b907d | 1665 | |
1da177e4 LT |
1666 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1667 | iml->next = inet->mc_list; | |
1da177e4 LT |
1668 | iml->sflist = NULL; |
1669 | iml->sfmode = MCAST_EXCLUDE; | |
1670 | inet->mc_list = iml; | |
1671 | ip_mc_inc_group(in_dev, addr); | |
1da177e4 | 1672 | err = 0; |
1da177e4 LT |
1673 | done: |
1674 | rtnl_shunlock(); | |
1da177e4 LT |
1675 | return err; |
1676 | } | |
1677 | ||
1678 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
1679 | struct in_device *in_dev) | |
1680 | { | |
1681 | int err; | |
1682 | ||
1683 | if (iml->sflist == 0) { | |
1684 | /* any-source empty exclude case */ | |
1685 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1686 | iml->sfmode, 0, NULL, 0); | |
1687 | } | |
1688 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1689 | iml->sfmode, iml->sflist->sl_count, | |
1690 | iml->sflist->sl_addr, 0); | |
1691 | sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); | |
1692 | iml->sflist = NULL; | |
1693 | return err; | |
1694 | } | |
1695 | ||
1696 | /* | |
1697 | * Ask a socket to leave a group. | |
1698 | */ | |
1699 | ||
1700 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1701 | { | |
1702 | struct inet_sock *inet = inet_sk(sk); | |
1703 | struct ip_mc_socklist *iml, **imlp; | |
84b42bae DS |
1704 | struct in_device *in_dev; |
1705 | u32 group = imr->imr_multiaddr.s_addr; | |
1706 | u32 ifindex; | |
1da177e4 LT |
1707 | |
1708 | rtnl_lock(); | |
84b42bae DS |
1709 | in_dev = ip_mc_find_dev(imr); |
1710 | if (!in_dev) { | |
1711 | rtnl_unlock(); | |
1712 | return -ENODEV; | |
1713 | } | |
1714 | ifindex = imr->imr_ifindex; | |
1da177e4 | 1715 | for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { |
84b42bae DS |
1716 | if (iml->multi.imr_multiaddr.s_addr == group && |
1717 | iml->multi.imr_ifindex == ifindex) { | |
1718 | (void) ip_mc_leave_src(sk, iml, in_dev); | |
1da177e4 LT |
1719 | |
1720 | *imlp = iml->next; | |
1721 | ||
84b42bae | 1722 | ip_mc_dec_group(in_dev, group); |
1da177e4 LT |
1723 | rtnl_unlock(); |
1724 | sock_kfree_s(sk, iml, sizeof(*iml)); | |
1725 | return 0; | |
1726 | } | |
1727 | } | |
1728 | rtnl_unlock(); | |
1729 | return -EADDRNOTAVAIL; | |
1730 | } | |
1731 | ||
1732 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1733 | ip_mreq_source *mreqs, int ifindex) | |
1734 | { | |
1735 | int err; | |
1736 | struct ip_mreqn imr; | |
1737 | u32 addr = mreqs->imr_multiaddr; | |
1738 | struct ip_mc_socklist *pmc; | |
1739 | struct in_device *in_dev = NULL; | |
1740 | struct inet_sock *inet = inet_sk(sk); | |
1741 | struct ip_sf_socklist *psl; | |
8cdaaa15 | 1742 | int leavegroup = 0; |
1da177e4 LT |
1743 | int i, j, rv; |
1744 | ||
1745 | if (!MULTICAST(addr)) | |
1746 | return -EINVAL; | |
1747 | ||
1748 | rtnl_shlock(); | |
1749 | ||
1750 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1751 | imr.imr_address.s_addr = mreqs->imr_interface; | |
1752 | imr.imr_ifindex = ifindex; | |
1753 | in_dev = ip_mc_find_dev(&imr); | |
1754 | ||
1755 | if (!in_dev) { | |
1756 | err = -ENODEV; | |
1757 | goto done; | |
1758 | } | |
1759 | err = -EADDRNOTAVAIL; | |
1760 | ||
1761 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
ca9b907d DS |
1762 | if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr |
1763 | && pmc->multi.imr_ifindex == imr.imr_ifindex) | |
1da177e4 LT |
1764 | break; |
1765 | } | |
917f2f10 DS |
1766 | if (!pmc) { /* must have a prior join */ |
1767 | err = -EINVAL; | |
1da177e4 | 1768 | goto done; |
917f2f10 | 1769 | } |
1da177e4 LT |
1770 | /* if a source filter was set, must be the same mode as before */ |
1771 | if (pmc->sflist) { | |
917f2f10 DS |
1772 | if (pmc->sfmode != omode) { |
1773 | err = -EINVAL; | |
1da177e4 | 1774 | goto done; |
917f2f10 | 1775 | } |
1da177e4 LT |
1776 | } else if (pmc->sfmode != omode) { |
1777 | /* allow mode switches for empty-set filters */ | |
1778 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
1779 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, | |
1780 | NULL, 0); | |
1781 | pmc->sfmode = omode; | |
1782 | } | |
1783 | ||
1784 | psl = pmc->sflist; | |
1785 | if (!add) { | |
1786 | if (!psl) | |
917f2f10 | 1787 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 LT |
1788 | rv = !0; |
1789 | for (i=0; i<psl->sl_count; i++) { | |
1790 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
1791 | sizeof(__u32)); | |
1792 | if (rv == 0) | |
1793 | break; | |
1794 | } | |
1795 | if (rv) /* source not found */ | |
917f2f10 | 1796 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 1797 | |
8cdaaa15 DS |
1798 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1799 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
1800 | leavegroup = 1; | |
1801 | goto done; | |
1802 | } | |
1803 | ||
1da177e4 LT |
1804 | /* update the interface filter */ |
1805 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, | |
1806 | &mreqs->imr_sourceaddr, 1); | |
1807 | ||
1808 | for (j=i+1; j<psl->sl_count; j++) | |
1809 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
1810 | psl->sl_count--; | |
1811 | err = 0; | |
1812 | goto done; | |
1813 | } | |
1814 | /* else, add a new source to the filter */ | |
1815 | ||
1816 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
1817 | err = -ENOBUFS; | |
1818 | goto done; | |
1819 | } | |
1820 | if (!psl || psl->sl_count == psl->sl_max) { | |
1821 | struct ip_sf_socklist *newpsl; | |
1822 | int count = IP_SFBLOCK; | |
1823 | ||
1824 | if (psl) | |
1825 | count += psl->sl_max; | |
8b3a7005 | 1826 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
1827 | if (!newpsl) { |
1828 | err = -ENOBUFS; | |
1829 | goto done; | |
1830 | } | |
1831 | newpsl->sl_max = count; | |
1832 | newpsl->sl_count = count - IP_SFBLOCK; | |
1833 | if (psl) { | |
1834 | for (i=0; i<psl->sl_count; i++) | |
1835 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
1836 | sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); | |
1837 | } | |
1838 | pmc->sflist = psl = newpsl; | |
1839 | } | |
1840 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
1841 | for (i=0; i<psl->sl_count; i++) { | |
1842 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
1843 | sizeof(__u32)); | |
1844 | if (rv == 0) | |
1845 | break; | |
1846 | } | |
1847 | if (rv == 0) /* address already there is an error */ | |
1848 | goto done; | |
1849 | for (j=psl->sl_count-1; j>=i; j--) | |
1850 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
1851 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
1852 | psl->sl_count++; | |
1853 | err = 0; | |
1854 | /* update the interface list */ | |
1855 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, | |
1856 | &mreqs->imr_sourceaddr, 1); | |
1857 | done: | |
1858 | rtnl_shunlock(); | |
8cdaaa15 DS |
1859 | if (leavegroup) |
1860 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
1861 | return err; |
1862 | } | |
1863 | ||
1864 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
1865 | { | |
9951f036 | 1866 | int err = 0; |
1da177e4 LT |
1867 | struct ip_mreqn imr; |
1868 | u32 addr = msf->imsf_multiaddr; | |
1869 | struct ip_mc_socklist *pmc; | |
1870 | struct in_device *in_dev; | |
1871 | struct inet_sock *inet = inet_sk(sk); | |
1872 | struct ip_sf_socklist *newpsl, *psl; | |
9951f036 | 1873 | int leavegroup = 0; |
1da177e4 LT |
1874 | |
1875 | if (!MULTICAST(addr)) | |
1876 | return -EINVAL; | |
1877 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
1878 | msf->imsf_fmode != MCAST_EXCLUDE) | |
1879 | return -EINVAL; | |
1880 | ||
1881 | rtnl_shlock(); | |
1882 | ||
1883 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
1884 | imr.imr_address.s_addr = msf->imsf_interface; | |
1885 | imr.imr_ifindex = ifindex; | |
1886 | in_dev = ip_mc_find_dev(&imr); | |
1887 | ||
1888 | if (!in_dev) { | |
1889 | err = -ENODEV; | |
1890 | goto done; | |
1891 | } | |
1da177e4 | 1892 | |
9951f036 DS |
1893 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1894 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
1895 | leavegroup = 1; | |
1896 | goto done; | |
1897 | } | |
1898 | ||
1da177e4 LT |
1899 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { |
1900 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
1901 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
1902 | break; | |
1903 | } | |
917f2f10 DS |
1904 | if (!pmc) { /* must have a prior join */ |
1905 | err = -EINVAL; | |
1da177e4 | 1906 | goto done; |
917f2f10 | 1907 | } |
1da177e4 | 1908 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
1909 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
1910 | GFP_KERNEL); | |
1da177e4 LT |
1911 | if (!newpsl) { |
1912 | err = -ENOBUFS; | |
1913 | goto done; | |
1914 | } | |
1915 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
1916 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
1917 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
1918 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
1919 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
1920 | if (err) { | |
1921 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
1922 | goto done; | |
1923 | } | |
8713dbf0 | 1924 | } else { |
1da177e4 | 1925 | newpsl = NULL; |
8713dbf0 YZ |
1926 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
1927 | msf->imsf_fmode, 0, NULL, 0); | |
1928 | } | |
1da177e4 LT |
1929 | psl = pmc->sflist; |
1930 | if (psl) { | |
1931 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
1932 | psl->sl_count, psl->sl_addr, 0); | |
1933 | sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); | |
1934 | } else | |
1935 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
1936 | 0, NULL, 0); | |
1937 | pmc->sflist = newpsl; | |
1938 | pmc->sfmode = msf->imsf_fmode; | |
917f2f10 | 1939 | err = 0; |
1da177e4 LT |
1940 | done: |
1941 | rtnl_shunlock(); | |
9951f036 DS |
1942 | if (leavegroup) |
1943 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
1944 | return err; |
1945 | } | |
1946 | ||
1947 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
1948 | struct ip_msfilter __user *optval, int __user *optlen) | |
1949 | { | |
1950 | int err, len, count, copycount; | |
1951 | struct ip_mreqn imr; | |
1952 | u32 addr = msf->imsf_multiaddr; | |
1953 | struct ip_mc_socklist *pmc; | |
1954 | struct in_device *in_dev; | |
1955 | struct inet_sock *inet = inet_sk(sk); | |
1956 | struct ip_sf_socklist *psl; | |
1957 | ||
1958 | if (!MULTICAST(addr)) | |
1959 | return -EINVAL; | |
1960 | ||
1961 | rtnl_shlock(); | |
1962 | ||
1963 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
1964 | imr.imr_address.s_addr = msf->imsf_interface; | |
1965 | imr.imr_ifindex = 0; | |
1966 | in_dev = ip_mc_find_dev(&imr); | |
1967 | ||
1968 | if (!in_dev) { | |
1969 | err = -ENODEV; | |
1970 | goto done; | |
1971 | } | |
1972 | err = -EADDRNOTAVAIL; | |
1973 | ||
1974 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
1975 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
1976 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
1977 | break; | |
1978 | } | |
1979 | if (!pmc) /* must have a prior join */ | |
1980 | goto done; | |
1981 | msf->imsf_fmode = pmc->sfmode; | |
1982 | psl = pmc->sflist; | |
1983 | rtnl_shunlock(); | |
1984 | if (!psl) { | |
1985 | len = 0; | |
1986 | count = 0; | |
1987 | } else { | |
1988 | count = psl->sl_count; | |
1989 | } | |
1990 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
1991 | len = copycount * sizeof(psl->sl_addr[0]); | |
1992 | msf->imsf_numsrc = count; | |
1993 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
1994 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
1995 | return -EFAULT; | |
1996 | } | |
1997 | if (len && | |
1998 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
1999 | return -EFAULT; | |
2000 | return 0; | |
2001 | done: | |
2002 | rtnl_shunlock(); | |
2003 | return err; | |
2004 | } | |
2005 | ||
2006 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2007 | struct group_filter __user *optval, int __user *optlen) | |
2008 | { | |
2009 | int err, i, count, copycount; | |
2010 | struct sockaddr_in *psin; | |
2011 | u32 addr; | |
2012 | struct ip_mc_socklist *pmc; | |
2013 | struct inet_sock *inet = inet_sk(sk); | |
2014 | struct ip_sf_socklist *psl; | |
2015 | ||
2016 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2017 | if (psin->sin_family != AF_INET) | |
2018 | return -EINVAL; | |
2019 | addr = psin->sin_addr.s_addr; | |
2020 | if (!MULTICAST(addr)) | |
2021 | return -EINVAL; | |
2022 | ||
2023 | rtnl_shlock(); | |
2024 | ||
2025 | err = -EADDRNOTAVAIL; | |
2026 | ||
2027 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2028 | if (pmc->multi.imr_multiaddr.s_addr == addr && | |
2029 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2030 | break; | |
2031 | } | |
2032 | if (!pmc) /* must have a prior join */ | |
2033 | goto done; | |
2034 | gsf->gf_fmode = pmc->sfmode; | |
2035 | psl = pmc->sflist; | |
2036 | rtnl_shunlock(); | |
2037 | count = psl ? psl->sl_count : 0; | |
2038 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2039 | gsf->gf_numsrc = count; | |
2040 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2041 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2042 | return -EFAULT; | |
2043 | } | |
2044 | for (i=0; i<copycount; i++) { | |
2045 | struct sockaddr_in *psin; | |
2046 | struct sockaddr_storage ss; | |
2047 | ||
2048 | psin = (struct sockaddr_in *)&ss; | |
2049 | memset(&ss, 0, sizeof(ss)); | |
2050 | psin->sin_family = AF_INET; | |
2051 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2052 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2053 | return -EFAULT; | |
2054 | } | |
2055 | return 0; | |
2056 | done: | |
2057 | rtnl_shunlock(); | |
2058 | return err; | |
2059 | } | |
2060 | ||
2061 | /* | |
2062 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2063 | */ | |
2064 | int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif) | |
2065 | { | |
2066 | struct inet_sock *inet = inet_sk(sk); | |
2067 | struct ip_mc_socklist *pmc; | |
2068 | struct ip_sf_socklist *psl; | |
2069 | int i; | |
2070 | ||
2071 | if (!MULTICAST(loc_addr)) | |
2072 | return 1; | |
2073 | ||
2074 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2075 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && | |
2076 | pmc->multi.imr_ifindex == dif) | |
2077 | break; | |
2078 | } | |
2079 | if (!pmc) | |
2080 | return 1; | |
2081 | psl = pmc->sflist; | |
2082 | if (!psl) | |
2083 | return pmc->sfmode == MCAST_EXCLUDE; | |
2084 | ||
2085 | for (i=0; i<psl->sl_count; i++) { | |
2086 | if (psl->sl_addr[i] == rmt_addr) | |
2087 | break; | |
2088 | } | |
2089 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) | |
2090 | return 0; | |
2091 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) | |
2092 | return 0; | |
2093 | return 1; | |
2094 | } | |
2095 | ||
2096 | /* | |
2097 | * A socket is closing. | |
2098 | */ | |
2099 | ||
2100 | void ip_mc_drop_socket(struct sock *sk) | |
2101 | { | |
2102 | struct inet_sock *inet = inet_sk(sk); | |
2103 | struct ip_mc_socklist *iml; | |
2104 | ||
2105 | if (inet->mc_list == NULL) | |
2106 | return; | |
2107 | ||
2108 | rtnl_lock(); | |
2109 | while ((iml = inet->mc_list) != NULL) { | |
2110 | struct in_device *in_dev; | |
2111 | inet->mc_list = iml->next; | |
2112 | ||
2113 | if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) { | |
2114 | (void) ip_mc_leave_src(sk, iml, in_dev); | |
2115 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); | |
2116 | in_dev_put(in_dev); | |
2117 | } | |
2118 | sock_kfree_s(sk, iml, sizeof(*iml)); | |
2119 | ||
2120 | } | |
2121 | rtnl_unlock(); | |
2122 | } | |
2123 | ||
2124 | int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto) | |
2125 | { | |
2126 | struct ip_mc_list *im; | |
2127 | struct ip_sf_list *psf; | |
2128 | int rv = 0; | |
2129 | ||
2130 | read_lock(&in_dev->mc_list_lock); | |
2131 | for (im=in_dev->mc_list; im; im=im->next) { | |
2132 | if (im->multiaddr == mc_addr) | |
2133 | break; | |
2134 | } | |
2135 | if (im && proto == IPPROTO_IGMP) { | |
2136 | rv = 1; | |
2137 | } else if (im) { | |
2138 | if (src_addr) { | |
2139 | for (psf=im->sources; psf; psf=psf->sf_next) { | |
2140 | if (psf->sf_inaddr == src_addr) | |
2141 | break; | |
2142 | } | |
2143 | if (psf) | |
2144 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2145 | psf->sf_count[MCAST_EXCLUDE] != | |
2146 | im->sfcount[MCAST_EXCLUDE]; | |
2147 | else | |
2148 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2149 | } else | |
2150 | rv = 1; /* unspecified source; tentatively allow */ | |
2151 | } | |
2152 | read_unlock(&in_dev->mc_list_lock); | |
2153 | return rv; | |
2154 | } | |
2155 | ||
2156 | #if defined(CONFIG_PROC_FS) | |
2157 | struct igmp_mc_iter_state { | |
2158 | struct net_device *dev; | |
2159 | struct in_device *in_dev; | |
2160 | }; | |
2161 | ||
2162 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2163 | ||
2164 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2165 | { | |
2166 | struct ip_mc_list *im = NULL; | |
2167 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2168 | ||
2169 | for (state->dev = dev_base, state->in_dev = NULL; | |
2170 | state->dev; | |
2171 | state->dev = state->dev->next) { | |
2172 | struct in_device *in_dev; | |
2173 | in_dev = in_dev_get(state->dev); | |
2174 | if (!in_dev) | |
2175 | continue; | |
2176 | read_lock(&in_dev->mc_list_lock); | |
2177 | im = in_dev->mc_list; | |
2178 | if (im) { | |
2179 | state->in_dev = in_dev; | |
2180 | break; | |
2181 | } | |
2182 | read_unlock(&in_dev->mc_list_lock); | |
2183 | in_dev_put(in_dev); | |
2184 | } | |
2185 | return im; | |
2186 | } | |
2187 | ||
2188 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2189 | { | |
2190 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2191 | im = im->next; | |
2192 | while (!im) { | |
2193 | if (likely(state->in_dev != NULL)) { | |
2194 | read_unlock(&state->in_dev->mc_list_lock); | |
2195 | in_dev_put(state->in_dev); | |
2196 | } | |
2197 | state->dev = state->dev->next; | |
2198 | if (!state->dev) { | |
2199 | state->in_dev = NULL; | |
2200 | break; | |
2201 | } | |
2202 | state->in_dev = in_dev_get(state->dev); | |
2203 | if (!state->in_dev) | |
2204 | continue; | |
2205 | read_lock(&state->in_dev->mc_list_lock); | |
2206 | im = state->in_dev->mc_list; | |
2207 | } | |
2208 | return im; | |
2209 | } | |
2210 | ||
2211 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2212 | { | |
2213 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2214 | if (im) | |
2215 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2216 | --pos; | |
2217 | return pos ? NULL : im; | |
2218 | } | |
2219 | ||
2220 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
2221 | { | |
2222 | read_lock(&dev_base_lock); | |
2223 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2224 | } | |
2225 | ||
2226 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2227 | { | |
2228 | struct ip_mc_list *im; | |
2229 | if (v == SEQ_START_TOKEN) | |
2230 | im = igmp_mc_get_first(seq); | |
2231 | else | |
2232 | im = igmp_mc_get_next(seq, v); | |
2233 | ++*pos; | |
2234 | return im; | |
2235 | } | |
2236 | ||
2237 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
2238 | { | |
2239 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2240 | if (likely(state->in_dev != NULL)) { | |
2241 | read_unlock(&state->in_dev->mc_list_lock); | |
2242 | in_dev_put(state->in_dev); | |
2243 | state->in_dev = NULL; | |
2244 | } | |
2245 | state->dev = NULL; | |
2246 | read_unlock(&dev_base_lock); | |
2247 | } | |
2248 | ||
2249 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2250 | { | |
2251 | if (v == SEQ_START_TOKEN) | |
2252 | seq_puts(seq, | |
2253 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); | |
2254 | else { | |
2255 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2256 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2257 | char *querier; | |
2258 | #ifdef CONFIG_IP_MULTICAST | |
2259 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2260 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2261 | "V3"; | |
2262 | #else | |
2263 | querier = "NONE"; | |
2264 | #endif | |
2265 | ||
2266 | if (state->in_dev->mc_list == im) { | |
2267 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", | |
2268 | state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); | |
2269 | } | |
2270 | ||
2271 | seq_printf(seq, | |
2272 | "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n", | |
2273 | im->multiaddr, im->users, | |
2274 | im->tm_running, im->tm_running ? | |
2275 | jiffies_to_clock_t(im->timer.expires-jiffies) : 0, | |
2276 | im->reporter); | |
2277 | } | |
2278 | return 0; | |
2279 | } | |
2280 | ||
2281 | static struct seq_operations igmp_mc_seq_ops = { | |
2282 | .start = igmp_mc_seq_start, | |
2283 | .next = igmp_mc_seq_next, | |
2284 | .stop = igmp_mc_seq_stop, | |
2285 | .show = igmp_mc_seq_show, | |
2286 | }; | |
2287 | ||
2288 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2289 | { | |
2290 | struct seq_file *seq; | |
2291 | int rc = -ENOMEM; | |
2292 | struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
2293 | ||
2294 | if (!s) | |
2295 | goto out; | |
2296 | rc = seq_open(file, &igmp_mc_seq_ops); | |
2297 | if (rc) | |
2298 | goto out_kfree; | |
2299 | ||
2300 | seq = file->private_data; | |
2301 | seq->private = s; | |
2302 | memset(s, 0, sizeof(*s)); | |
2303 | out: | |
2304 | return rc; | |
2305 | out_kfree: | |
2306 | kfree(s); | |
2307 | goto out; | |
2308 | } | |
2309 | ||
2310 | static struct file_operations igmp_mc_seq_fops = { | |
2311 | .owner = THIS_MODULE, | |
2312 | .open = igmp_mc_seq_open, | |
2313 | .read = seq_read, | |
2314 | .llseek = seq_lseek, | |
2315 | .release = seq_release_private, | |
2316 | }; | |
2317 | ||
2318 | struct igmp_mcf_iter_state { | |
2319 | struct net_device *dev; | |
2320 | struct in_device *idev; | |
2321 | struct ip_mc_list *im; | |
2322 | }; | |
2323 | ||
2324 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2325 | ||
2326 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2327 | { | |
2328 | struct ip_sf_list *psf = NULL; | |
2329 | struct ip_mc_list *im = NULL; | |
2330 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2331 | ||
2332 | for (state->dev = dev_base, state->idev = NULL, state->im = NULL; | |
2333 | state->dev; | |
2334 | state->dev = state->dev->next) { | |
2335 | struct in_device *idev; | |
2336 | idev = in_dev_get(state->dev); | |
2337 | if (unlikely(idev == NULL)) | |
2338 | continue; | |
2339 | read_lock(&idev->mc_list_lock); | |
2340 | im = idev->mc_list; | |
2341 | if (likely(im != NULL)) { | |
2342 | spin_lock_bh(&im->lock); | |
2343 | psf = im->sources; | |
2344 | if (likely(psf != NULL)) { | |
2345 | state->im = im; | |
2346 | state->idev = idev; | |
2347 | break; | |
2348 | } | |
2349 | spin_unlock_bh(&im->lock); | |
2350 | } | |
2351 | read_unlock(&idev->mc_list_lock); | |
2352 | in_dev_put(idev); | |
2353 | } | |
2354 | return psf; | |
2355 | } | |
2356 | ||
2357 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2358 | { | |
2359 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2360 | ||
2361 | psf = psf->sf_next; | |
2362 | while (!psf) { | |
2363 | spin_unlock_bh(&state->im->lock); | |
2364 | state->im = state->im->next; | |
2365 | while (!state->im) { | |
2366 | if (likely(state->idev != NULL)) { | |
2367 | read_unlock(&state->idev->mc_list_lock); | |
2368 | in_dev_put(state->idev); | |
2369 | } | |
2370 | state->dev = state->dev->next; | |
2371 | if (!state->dev) { | |
2372 | state->idev = NULL; | |
2373 | goto out; | |
2374 | } | |
2375 | state->idev = in_dev_get(state->dev); | |
2376 | if (!state->idev) | |
2377 | continue; | |
2378 | read_lock(&state->idev->mc_list_lock); | |
2379 | state->im = state->idev->mc_list; | |
2380 | } | |
2381 | if (!state->im) | |
2382 | break; | |
2383 | spin_lock_bh(&state->im->lock); | |
2384 | psf = state->im->sources; | |
2385 | } | |
2386 | out: | |
2387 | return psf; | |
2388 | } | |
2389 | ||
2390 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2391 | { | |
2392 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2393 | if (psf) | |
2394 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2395 | --pos; | |
2396 | return pos ? NULL : psf; | |
2397 | } | |
2398 | ||
2399 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
2400 | { | |
2401 | read_lock(&dev_base_lock); | |
2402 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2403 | } | |
2404 | ||
2405 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2406 | { | |
2407 | struct ip_sf_list *psf; | |
2408 | if (v == SEQ_START_TOKEN) | |
2409 | psf = igmp_mcf_get_first(seq); | |
2410 | else | |
2411 | psf = igmp_mcf_get_next(seq, v); | |
2412 | ++*pos; | |
2413 | return psf; | |
2414 | } | |
2415 | ||
2416 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
2417 | { | |
2418 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2419 | if (likely(state->im != NULL)) { | |
2420 | spin_unlock_bh(&state->im->lock); | |
2421 | state->im = NULL; | |
2422 | } | |
2423 | if (likely(state->idev != NULL)) { | |
2424 | read_unlock(&state->idev->mc_list_lock); | |
2425 | in_dev_put(state->idev); | |
2426 | state->idev = NULL; | |
2427 | } | |
2428 | state->dev = NULL; | |
2429 | read_unlock(&dev_base_lock); | |
2430 | } | |
2431 | ||
2432 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2433 | { | |
2434 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2435 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2436 | ||
2437 | if (v == SEQ_START_TOKEN) { | |
2438 | seq_printf(seq, | |
2439 | "%3s %6s " | |
2440 | "%10s %10s %6s %6s\n", "Idx", | |
2441 | "Device", "MCA", | |
2442 | "SRC", "INC", "EXC"); | |
2443 | } else { | |
2444 | seq_printf(seq, | |
2445 | "%3d %6.6s 0x%08x " | |
2446 | "0x%08x %6lu %6lu\n", | |
2447 | state->dev->ifindex, state->dev->name, | |
2448 | ntohl(state->im->multiaddr), | |
2449 | ntohl(psf->sf_inaddr), | |
2450 | psf->sf_count[MCAST_INCLUDE], | |
2451 | psf->sf_count[MCAST_EXCLUDE]); | |
2452 | } | |
2453 | return 0; | |
2454 | } | |
2455 | ||
2456 | static struct seq_operations igmp_mcf_seq_ops = { | |
2457 | .start = igmp_mcf_seq_start, | |
2458 | .next = igmp_mcf_seq_next, | |
2459 | .stop = igmp_mcf_seq_stop, | |
2460 | .show = igmp_mcf_seq_show, | |
2461 | }; | |
2462 | ||
2463 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2464 | { | |
2465 | struct seq_file *seq; | |
2466 | int rc = -ENOMEM; | |
2467 | struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
2468 | ||
2469 | if (!s) | |
2470 | goto out; | |
2471 | rc = seq_open(file, &igmp_mcf_seq_ops); | |
2472 | if (rc) | |
2473 | goto out_kfree; | |
2474 | ||
2475 | seq = file->private_data; | |
2476 | seq->private = s; | |
2477 | memset(s, 0, sizeof(*s)); | |
2478 | out: | |
2479 | return rc; | |
2480 | out_kfree: | |
2481 | kfree(s); | |
2482 | goto out; | |
2483 | } | |
2484 | ||
2485 | static struct file_operations igmp_mcf_seq_fops = { | |
2486 | .owner = THIS_MODULE, | |
2487 | .open = igmp_mcf_seq_open, | |
2488 | .read = seq_read, | |
2489 | .llseek = seq_lseek, | |
2490 | .release = seq_release_private, | |
2491 | }; | |
2492 | ||
2493 | int __init igmp_mc_proc_init(void) | |
2494 | { | |
2495 | proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); | |
2496 | proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); | |
2497 | return 0; | |
2498 | } | |
2499 | #endif | |
2500 | ||
2501 | EXPORT_SYMBOL(ip_mc_dec_group); | |
2502 | EXPORT_SYMBOL(ip_mc_inc_group); | |
2503 | EXPORT_SYMBOL(ip_mc_join_group); |