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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> | |
94 | #include <net/ip.h> | |
95 | #include <net/protocol.h> | |
96 | #include <net/route.h> | |
97 | #include <net/sock.h> | |
98 | #include <net/checksum.h> | |
99 | #include <linux/netfilter_ipv4.h> | |
100 | #ifdef CONFIG_IP_MROUTE | |
101 | #include <linux/mroute.h> | |
102 | #endif | |
103 | #ifdef CONFIG_PROC_FS | |
104 | #include <linux/proc_fs.h> | |
105 | #include <linux/seq_file.h> | |
106 | #endif | |
107 | ||
108 | #define IP_MAX_MEMBERSHIPS 20 | |
109 | #define IP_MAX_MSF 10 | |
110 | ||
111 | #ifdef CONFIG_IP_MULTICAST | |
112 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
113 | ||
114 | #define IGMP_V1_Router_Present_Timeout (400*HZ) | |
115 | #define IGMP_V2_Router_Present_Timeout (400*HZ) | |
116 | #define IGMP_Unsolicited_Report_Interval (10*HZ) | |
117 | #define IGMP_Query_Response_Interval (10*HZ) | |
118 | #define IGMP_Unsolicited_Report_Count 2 | |
119 | ||
120 | ||
121 | #define IGMP_Initial_Report_Delay (1) | |
122 | ||
123 | /* IGMP_Initial_Report_Delay is not from IGMP specs! | |
124 | * IGMP specs require to report membership immediately after | |
125 | * joining a group, but we delay the first report by a | |
126 | * small interval. It seems more natural and still does not | |
127 | * contradict to specs provided this delay is small enough. | |
128 | */ | |
129 | ||
130 | #define IGMP_V1_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 1 || \ | |
131 | (in_dev)->cnf.force_igmp_version == 1 || \ | |
132 | ((in_dev)->mr_v1_seen && \ | |
133 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
134 | #define IGMP_V2_SEEN(in_dev) (ipv4_devconf.force_igmp_version == 2 || \ | |
135 | (in_dev)->cnf.force_igmp_version == 2 || \ | |
136 | ((in_dev)->mr_v2_seen && \ | |
137 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
138 | ||
139 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); | |
140 | static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr); | |
141 | static void igmpv3_clear_delrec(struct in_device *in_dev); | |
142 | static int sf_setstate(struct ip_mc_list *pmc); | |
143 | static void sf_markstate(struct ip_mc_list *pmc); | |
144 | #endif | |
145 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
146 | static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, | |
147 | int sfcount, __u32 *psfsrc, int delta); | |
148 | ||
149 | static void ip_ma_put(struct ip_mc_list *im) | |
150 | { | |
151 | if (atomic_dec_and_test(&im->refcnt)) { | |
152 | in_dev_put(im->interface); | |
153 | kfree(im); | |
154 | } | |
155 | } | |
156 | ||
157 | #ifdef CONFIG_IP_MULTICAST | |
158 | ||
159 | /* | |
160 | * Timer management | |
161 | */ | |
162 | ||
163 | static __inline__ void igmp_stop_timer(struct ip_mc_list *im) | |
164 | { | |
165 | spin_lock_bh(&im->lock); | |
166 | if (del_timer(&im->timer)) | |
167 | atomic_dec(&im->refcnt); | |
168 | im->tm_running=0; | |
169 | im->reporter = 0; | |
170 | im->unsolicit_count = 0; | |
171 | spin_unlock_bh(&im->lock); | |
172 | } | |
173 | ||
174 | /* It must be called with locked im->lock */ | |
175 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
176 | { | |
177 | int tv=net_random() % max_delay; | |
178 | ||
179 | im->tm_running=1; | |
180 | if (!mod_timer(&im->timer, jiffies+tv+2)) | |
181 | atomic_inc(&im->refcnt); | |
182 | } | |
183 | ||
184 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
185 | { | |
186 | int tv = net_random() % in_dev->mr_maxdelay; | |
187 | ||
188 | in_dev->mr_gq_running = 1; | |
189 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
190 | in_dev_hold(in_dev); | |
191 | } | |
192 | ||
193 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
194 | { | |
195 | int tv = net_random() % delay; | |
196 | ||
197 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
198 | in_dev_hold(in_dev); | |
199 | } | |
200 | ||
201 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
202 | { | |
203 | spin_lock_bh(&im->lock); | |
204 | im->unsolicit_count = 0; | |
205 | if (del_timer(&im->timer)) { | |
206 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
207 | add_timer(&im->timer); | |
208 | im->tm_running=1; | |
209 | spin_unlock_bh(&im->lock); | |
210 | return; | |
211 | } | |
212 | atomic_dec(&im->refcnt); | |
213 | } | |
214 | igmp_start_timer(im, max_delay); | |
215 | spin_unlock_bh(&im->lock); | |
216 | } | |
217 | ||
218 | ||
219 | /* | |
220 | * Send an IGMP report. | |
221 | */ | |
222 | ||
223 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
224 | ||
225 | ||
226 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
227 | int gdeleted, int sdeleted) | |
228 | { | |
229 | switch (type) { | |
230 | case IGMPV3_MODE_IS_INCLUDE: | |
231 | case IGMPV3_MODE_IS_EXCLUDE: | |
232 | if (gdeleted || sdeleted) | |
233 | return 0; | |
234 | return !(pmc->gsquery && !psf->sf_gsresp); | |
235 | case IGMPV3_CHANGE_TO_INCLUDE: | |
236 | if (gdeleted || sdeleted) | |
237 | return 0; | |
238 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
239 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
240 | if (gdeleted || sdeleted) | |
241 | return 0; | |
242 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
243 | psf->sf_count[MCAST_INCLUDE]) | |
244 | return 0; | |
245 | return pmc->sfcount[MCAST_EXCLUDE] == | |
246 | psf->sf_count[MCAST_EXCLUDE]; | |
247 | case IGMPV3_ALLOW_NEW_SOURCES: | |
248 | if (gdeleted || !psf->sf_crcount) | |
249 | return 0; | |
250 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
251 | case IGMPV3_BLOCK_OLD_SOURCES: | |
252 | if (pmc->sfmode == MCAST_INCLUDE) | |
253 | return gdeleted || (psf->sf_crcount && sdeleted); | |
254 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
255 | } | |
256 | return 0; | |
257 | } | |
258 | ||
259 | static int | |
260 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
261 | { | |
262 | struct ip_sf_list *psf; | |
263 | int scount = 0; | |
264 | ||
265 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
266 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) | |
267 | continue; | |
268 | scount++; | |
269 | } | |
270 | return scount; | |
271 | } | |
272 | ||
273 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) | |
274 | { | |
275 | struct sk_buff *skb; | |
276 | struct rtable *rt; | |
277 | struct iphdr *pip; | |
278 | struct igmpv3_report *pig; | |
279 | ||
280 | skb = alloc_skb(size + LL_RESERVED_SPACE(dev), GFP_ATOMIC); | |
281 | if (skb == NULL) | |
282 | return NULL; | |
283 | ||
284 | { | |
285 | struct flowi fl = { .oif = dev->ifindex, | |
286 | .nl_u = { .ip4_u = { | |
287 | .daddr = IGMPV3_ALL_MCR } }, | |
288 | .proto = IPPROTO_IGMP }; | |
289 | if (ip_route_output_key(&rt, &fl)) { | |
290 | kfree_skb(skb); | |
291 | return NULL; | |
292 | } | |
293 | } | |
294 | if (rt->rt_src == 0) { | |
295 | kfree_skb(skb); | |
296 | ip_rt_put(rt); | |
297 | return NULL; | |
298 | } | |
299 | ||
300 | skb->dst = &rt->u.dst; | |
301 | skb->dev = dev; | |
302 | ||
303 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
304 | ||
305 | skb->nh.iph = pip =(struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); | |
306 | ||
307 | pip->version = 4; | |
308 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
309 | pip->tos = 0xc0; | |
310 | pip->frag_off = htons(IP_DF); | |
311 | pip->ttl = 1; | |
312 | pip->daddr = rt->rt_dst; | |
313 | pip->saddr = rt->rt_src; | |
314 | pip->protocol = IPPROTO_IGMP; | |
315 | pip->tot_len = 0; /* filled in later */ | |
316 | ip_select_ident(pip, &rt->u.dst, NULL); | |
317 | ((u8*)&pip[1])[0] = IPOPT_RA; | |
318 | ((u8*)&pip[1])[1] = 4; | |
319 | ((u8*)&pip[1])[2] = 0; | |
320 | ((u8*)&pip[1])[3] = 0; | |
321 | ||
322 | pig =(struct igmpv3_report *)skb_put(skb, sizeof(*pig)); | |
323 | skb->h.igmph = (struct igmphdr *)pig; | |
324 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
325 | pig->resv1 = 0; | |
326 | pig->csum = 0; | |
327 | pig->resv2 = 0; | |
328 | pig->ngrec = 0; | |
329 | return skb; | |
330 | } | |
331 | ||
332 | static int igmpv3_sendpack(struct sk_buff *skb) | |
333 | { | |
334 | struct iphdr *pip = skb->nh.iph; | |
335 | struct igmphdr *pig = skb->h.igmph; | |
336 | int iplen, igmplen; | |
337 | ||
338 | iplen = skb->tail - (unsigned char *)skb->nh.iph; | |
339 | pip->tot_len = htons(iplen); | |
340 | ip_send_check(pip); | |
341 | ||
342 | igmplen = skb->tail - (unsigned char *)skb->h.igmph; | |
343 | pig->csum = ip_compute_csum((void *)skb->h.igmph, igmplen); | |
344 | ||
345 | return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev, | |
346 | dst_output); | |
347 | } | |
348 | ||
349 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
350 | { | |
351 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc,type,gdel,sdel); | |
352 | } | |
353 | ||
354 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
355 | int type, struct igmpv3_grec **ppgr) | |
356 | { | |
357 | struct net_device *dev = pmc->interface->dev; | |
358 | struct igmpv3_report *pih; | |
359 | struct igmpv3_grec *pgr; | |
360 | ||
361 | if (!skb) | |
362 | skb = igmpv3_newpack(dev, dev->mtu); | |
363 | if (!skb) | |
364 | return NULL; | |
365 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
366 | pgr->grec_type = type; | |
367 | pgr->grec_auxwords = 0; | |
368 | pgr->grec_nsrcs = 0; | |
369 | pgr->grec_mca = pmc->multiaddr; | |
370 | pih = (struct igmpv3_report *)skb->h.igmph; | |
371 | pih->ngrec = htons(ntohs(pih->ngrec)+1); | |
372 | *ppgr = pgr; | |
373 | return skb; | |
374 | } | |
375 | ||
376 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ | |
377 | skb_tailroom(skb)) : 0) | |
378 | ||
379 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
380 | int type, int gdeleted, int sdeleted) | |
381 | { | |
382 | struct net_device *dev = pmc->interface->dev; | |
383 | struct igmpv3_report *pih; | |
384 | struct igmpv3_grec *pgr = NULL; | |
385 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
386 | int scount, first, isquery, truncate; | |
387 | ||
388 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
389 | return skb; | |
390 | ||
391 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
392 | type == IGMPV3_MODE_IS_EXCLUDE; | |
393 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
394 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
395 | ||
396 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; | |
397 | ||
398 | if (!*psf_list) { | |
399 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
400 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
401 | return skb; | |
402 | if (pmc->crcount || isquery) { | |
403 | /* make sure we have room for group header and at | |
404 | * least one source. | |
405 | */ | |
406 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)+ | |
407 | sizeof(__u32)) { | |
408 | igmpv3_sendpack(skb); | |
409 | skb = NULL; /* add_grhead will get a new one */ | |
410 | } | |
411 | skb = add_grhead(skb, pmc, type, &pgr); | |
412 | } | |
413 | return skb; | |
414 | } | |
415 | pih = skb ? (struct igmpv3_report *)skb->h.igmph : NULL; | |
416 | ||
417 | /* EX and TO_EX get a fresh packet, if needed */ | |
418 | if (truncate) { | |
419 | if (pih && pih->ngrec && | |
420 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
421 | if (skb) | |
422 | igmpv3_sendpack(skb); | |
423 | skb = igmpv3_newpack(dev, dev->mtu); | |
424 | } | |
425 | } | |
426 | first = 1; | |
427 | scount = 0; | |
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; | |
461 | scount++; | |
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 | } | |
476 | if (pgr) | |
477 | pgr->grec_nsrcs = htons(scount); | |
478 | ||
479 | if (isquery) | |
480 | pmc->gsquery = 0; /* clear query state on report */ | |
481 | return skb; | |
482 | } | |
483 | ||
484 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
485 | { | |
486 | struct sk_buff *skb = NULL; | |
487 | int type; | |
488 | ||
489 | if (!pmc) { | |
490 | read_lock(&in_dev->mc_list_lock); | |
491 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
492 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
493 | continue; | |
494 | spin_lock_bh(&pmc->lock); | |
495 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
496 | type = IGMPV3_MODE_IS_EXCLUDE; | |
497 | else | |
498 | type = IGMPV3_MODE_IS_INCLUDE; | |
499 | skb = add_grec(skb, pmc, type, 0, 0); | |
500 | spin_unlock_bh(&pmc->lock); | |
501 | } | |
502 | read_unlock(&in_dev->mc_list_lock); | |
503 | } else { | |
504 | spin_lock_bh(&pmc->lock); | |
505 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
506 | type = IGMPV3_MODE_IS_EXCLUDE; | |
507 | else | |
508 | type = IGMPV3_MODE_IS_INCLUDE; | |
509 | skb = add_grec(skb, pmc, type, 0, 0); | |
510 | spin_unlock_bh(&pmc->lock); | |
511 | } | |
512 | if (!skb) | |
513 | return 0; | |
514 | return igmpv3_sendpack(skb); | |
515 | } | |
516 | ||
517 | /* | |
518 | * remove zero-count source records from a source filter list | |
519 | */ | |
520 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
521 | { | |
522 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
523 | ||
524 | psf_prev = NULL; | |
525 | for (psf=*ppsf; psf; psf = psf_next) { | |
526 | psf_next = psf->sf_next; | |
527 | if (psf->sf_crcount == 0) { | |
528 | if (psf_prev) | |
529 | psf_prev->sf_next = psf->sf_next; | |
530 | else | |
531 | *ppsf = psf->sf_next; | |
532 | kfree(psf); | |
533 | } else | |
534 | psf_prev = psf; | |
535 | } | |
536 | } | |
537 | ||
538 | static void igmpv3_send_cr(struct in_device *in_dev) | |
539 | { | |
540 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
541 | struct sk_buff *skb = NULL; | |
542 | int type, dtype; | |
543 | ||
544 | read_lock(&in_dev->mc_list_lock); | |
545 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
546 | ||
547 | /* deleted MCA's */ | |
548 | pmc_prev = NULL; | |
549 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { | |
550 | pmc_next = pmc->next; | |
551 | if (pmc->sfmode == MCAST_INCLUDE) { | |
552 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
553 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
554 | skb = add_grec(skb, pmc, type, 1, 0); | |
555 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
556 | } | |
557 | if (pmc->crcount) { | |
558 | pmc->crcount--; | |
559 | if (pmc->sfmode == MCAST_EXCLUDE) { | |
560 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
561 | skb = add_grec(skb, pmc, type, 1, 0); | |
562 | } | |
563 | if (pmc->crcount == 0) { | |
564 | igmpv3_clear_zeros(&pmc->tomb); | |
565 | igmpv3_clear_zeros(&pmc->sources); | |
566 | } | |
567 | } | |
568 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
569 | if (pmc_prev) | |
570 | pmc_prev->next = pmc_next; | |
571 | else | |
572 | in_dev->mc_tomb = pmc_next; | |
573 | in_dev_put(pmc->interface); | |
574 | kfree(pmc); | |
575 | } else | |
576 | pmc_prev = pmc; | |
577 | } | |
578 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
579 | ||
580 | /* change recs */ | |
581 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
582 | spin_lock_bh(&pmc->lock); | |
583 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
584 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
585 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
586 | } else { | |
587 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
588 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
589 | } | |
590 | skb = add_grec(skb, pmc, type, 0, 0); | |
591 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
592 | ||
593 | /* filter mode changes */ | |
594 | if (pmc->crcount) { | |
595 | pmc->crcount--; | |
596 | if (pmc->sfmode == MCAST_EXCLUDE) | |
597 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
598 | else | |
599 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
600 | skb = add_grec(skb, pmc, type, 0, 0); | |
601 | } | |
602 | spin_unlock_bh(&pmc->lock); | |
603 | } | |
604 | read_unlock(&in_dev->mc_list_lock); | |
605 | ||
606 | if (!skb) | |
607 | return; | |
608 | (void) igmpv3_sendpack(skb); | |
609 | } | |
610 | ||
611 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
612 | int type) | |
613 | { | |
614 | struct sk_buff *skb; | |
615 | struct iphdr *iph; | |
616 | struct igmphdr *ih; | |
617 | struct rtable *rt; | |
618 | struct net_device *dev = in_dev->dev; | |
619 | u32 group = pmc ? pmc->multiaddr : 0; | |
620 | u32 dst; | |
621 | ||
622 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
623 | return igmpv3_send_report(in_dev, pmc); | |
624 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
625 | dst = IGMP_ALL_ROUTER; | |
626 | else | |
627 | dst = group; | |
628 | ||
629 | { | |
630 | struct flowi fl = { .oif = dev->ifindex, | |
631 | .nl_u = { .ip4_u = { .daddr = dst } }, | |
632 | .proto = IPPROTO_IGMP }; | |
633 | if (ip_route_output_key(&rt, &fl)) | |
634 | return -1; | |
635 | } | |
636 | if (rt->rt_src == 0) { | |
637 | ip_rt_put(rt); | |
638 | return -1; | |
639 | } | |
640 | ||
641 | skb=alloc_skb(IGMP_SIZE+LL_RESERVED_SPACE(dev), GFP_ATOMIC); | |
642 | if (skb == NULL) { | |
643 | ip_rt_put(rt); | |
644 | return -1; | |
645 | } | |
646 | ||
647 | skb->dst = &rt->u.dst; | |
648 | ||
649 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
650 | ||
651 | skb->nh.iph = iph = (struct iphdr *)skb_put(skb, sizeof(struct iphdr)+4); | |
652 | ||
653 | iph->version = 4; | |
654 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
655 | iph->tos = 0xc0; | |
656 | iph->frag_off = htons(IP_DF); | |
657 | iph->ttl = 1; | |
658 | iph->daddr = dst; | |
659 | iph->saddr = rt->rt_src; | |
660 | iph->protocol = IPPROTO_IGMP; | |
661 | iph->tot_len = htons(IGMP_SIZE); | |
662 | ip_select_ident(iph, &rt->u.dst, NULL); | |
663 | ((u8*)&iph[1])[0] = IPOPT_RA; | |
664 | ((u8*)&iph[1])[1] = 4; | |
665 | ((u8*)&iph[1])[2] = 0; | |
666 | ((u8*)&iph[1])[3] = 0; | |
667 | ip_send_check(iph); | |
668 | ||
669 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
670 | ih->type=type; | |
671 | ih->code=0; | |
672 | ih->csum=0; | |
673 | ih->group=group; | |
674 | ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
675 | ||
676 | return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, | |
677 | dst_output); | |
678 | } | |
679 | ||
680 | static void igmp_gq_timer_expire(unsigned long data) | |
681 | { | |
682 | struct in_device *in_dev = (struct in_device *)data; | |
683 | ||
684 | in_dev->mr_gq_running = 0; | |
685 | igmpv3_send_report(in_dev, NULL); | |
686 | __in_dev_put(in_dev); | |
687 | } | |
688 | ||
689 | static void igmp_ifc_timer_expire(unsigned long data) | |
690 | { | |
691 | struct in_device *in_dev = (struct in_device *)data; | |
692 | ||
693 | igmpv3_send_cr(in_dev); | |
694 | if (in_dev->mr_ifc_count) { | |
695 | in_dev->mr_ifc_count--; | |
696 | igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); | |
697 | } | |
698 | __in_dev_put(in_dev); | |
699 | } | |
700 | ||
701 | static void igmp_ifc_event(struct in_device *in_dev) | |
702 | { | |
703 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
704 | return; | |
705 | in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : | |
706 | IGMP_Unsolicited_Report_Count; | |
707 | igmp_ifc_start_timer(in_dev, 1); | |
708 | } | |
709 | ||
710 | ||
711 | static void igmp_timer_expire(unsigned long data) | |
712 | { | |
713 | struct ip_mc_list *im=(struct ip_mc_list *)data; | |
714 | struct in_device *in_dev = im->interface; | |
715 | ||
716 | spin_lock(&im->lock); | |
717 | im->tm_running=0; | |
718 | ||
719 | if (im->unsolicit_count) { | |
720 | im->unsolicit_count--; | |
721 | igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); | |
722 | } | |
723 | im->reporter = 1; | |
724 | spin_unlock(&im->lock); | |
725 | ||
726 | if (IGMP_V1_SEEN(in_dev)) | |
727 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
728 | else if (IGMP_V2_SEEN(in_dev)) | |
729 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
730 | else | |
731 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
732 | ||
733 | ip_ma_put(im); | |
734 | } | |
735 | ||
736 | static void igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __u32 *srcs) | |
737 | { | |
738 | struct ip_sf_list *psf; | |
739 | int i, scount; | |
740 | ||
741 | scount = 0; | |
742 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
743 | if (scount == nsrcs) | |
744 | break; | |
745 | for (i=0; i<nsrcs; i++) | |
746 | if (srcs[i] == psf->sf_inaddr) { | |
747 | psf->sf_gsresp = 1; | |
748 | scount++; | |
749 | break; | |
750 | } | |
751 | } | |
752 | } | |
753 | ||
754 | static void igmp_heard_report(struct in_device *in_dev, u32 group) | |
755 | { | |
756 | struct ip_mc_list *im; | |
757 | ||
758 | /* Timers are only set for non-local groups */ | |
759 | ||
760 | if (group == IGMP_ALL_HOSTS) | |
761 | return; | |
762 | ||
763 | read_lock(&in_dev->mc_list_lock); | |
764 | for (im=in_dev->mc_list; im!=NULL; im=im->next) { | |
765 | if (im->multiaddr == group) { | |
766 | igmp_stop_timer(im); | |
767 | break; | |
768 | } | |
769 | } | |
770 | read_unlock(&in_dev->mc_list_lock); | |
771 | } | |
772 | ||
773 | static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
774 | int len) | |
775 | { | |
776 | struct igmphdr *ih = skb->h.igmph; | |
777 | struct igmpv3_query *ih3 = (struct igmpv3_query *)ih; | |
778 | struct ip_mc_list *im; | |
779 | u32 group = ih->group; | |
780 | int max_delay; | |
781 | int mark = 0; | |
782 | ||
783 | ||
784 | if (len == 8) { | |
785 | if (ih->code == 0) { | |
786 | /* Alas, old v1 router presents here. */ | |
787 | ||
788 | max_delay = IGMP_Query_Response_Interval; | |
789 | in_dev->mr_v1_seen = jiffies + | |
790 | IGMP_V1_Router_Present_Timeout; | |
791 | group = 0; | |
792 | } else { | |
793 | /* v2 router present */ | |
794 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
795 | in_dev->mr_v2_seen = jiffies + | |
796 | IGMP_V2_Router_Present_Timeout; | |
797 | } | |
798 | /* cancel the interface change timer */ | |
799 | in_dev->mr_ifc_count = 0; | |
800 | if (del_timer(&in_dev->mr_ifc_timer)) | |
801 | __in_dev_put(in_dev); | |
802 | /* clear deleted report items */ | |
803 | igmpv3_clear_delrec(in_dev); | |
804 | } else if (len < 12) { | |
805 | return; /* ignore bogus packet; freed by caller */ | |
806 | } else { /* v3 */ | |
807 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
808 | return; | |
809 | ||
810 | ih3 = (struct igmpv3_query *) skb->h.raw; | |
811 | if (ih3->nsrcs) { | |
812 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) | |
813 | + ntohs(ih3->nsrcs)*sizeof(__u32))) | |
814 | return; | |
815 | ih3 = (struct igmpv3_query *) skb->h.raw; | |
816 | } | |
817 | ||
818 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
819 | if (!max_delay) | |
820 | max_delay = 1; /* can't mod w/ 0 */ | |
821 | in_dev->mr_maxdelay = max_delay; | |
822 | if (ih3->qrv) | |
823 | in_dev->mr_qrv = ih3->qrv; | |
824 | if (!group) { /* general query */ | |
825 | if (ih3->nsrcs) | |
826 | return; /* no sources allowed */ | |
827 | igmp_gq_start_timer(in_dev); | |
828 | return; | |
829 | } | |
830 | /* mark sources to include, if group & source-specific */ | |
831 | mark = ih3->nsrcs != 0; | |
832 | } | |
833 | ||
834 | /* | |
835 | * - Start the timers in all of our membership records | |
836 | * that the query applies to for the interface on | |
837 | * which the query arrived excl. those that belong | |
838 | * to a "local" group (224.0.0.X) | |
839 | * - For timers already running check if they need to | |
840 | * be reset. | |
841 | * - Use the igmp->igmp_code field as the maximum | |
842 | * delay possible | |
843 | */ | |
844 | read_lock(&in_dev->mc_list_lock); | |
845 | for (im=in_dev->mc_list; im!=NULL; im=im->next) { | |
846 | if (group && group != im->multiaddr) | |
847 | continue; | |
848 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
849 | continue; | |
850 | spin_lock_bh(&im->lock); | |
851 | if (im->tm_running) | |
852 | im->gsquery = im->gsquery && mark; | |
853 | else | |
854 | im->gsquery = mark; | |
855 | if (im->gsquery) | |
856 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); | |
857 | spin_unlock_bh(&im->lock); | |
858 | igmp_mod_timer(im, max_delay); | |
859 | } | |
860 | read_unlock(&in_dev->mc_list_lock); | |
861 | } | |
862 | ||
863 | int igmp_rcv(struct sk_buff *skb) | |
864 | { | |
865 | /* This basically follows the spec line by line -- see RFC1112 */ | |
866 | struct igmphdr *ih; | |
867 | struct in_device *in_dev = in_dev_get(skb->dev); | |
868 | int len = skb->len; | |
869 | ||
870 | if (in_dev==NULL) { | |
871 | kfree_skb(skb); | |
872 | return 0; | |
873 | } | |
874 | ||
fb286bb2 HX |
875 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
876 | goto drop; | |
877 | ||
878 | switch (skb->ip_summed) { | |
879 | case CHECKSUM_HW: | |
880 | if (!(u16)csum_fold(skb->csum)) | |
881 | break; | |
882 | /* fall through */ | |
883 | case CHECKSUM_NONE: | |
884 | skb->csum = 0; | |
885 | if (__skb_checksum_complete(skb)) | |
886 | goto drop; | |
1da177e4 LT |
887 | } |
888 | ||
889 | ih = skb->h.igmph; | |
890 | switch (ih->type) { | |
891 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
892 | igmp_heard_query(in_dev, skb, len); | |
893 | break; | |
894 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
895 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
896 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
897 | /* Is it our report looped back? */ | |
898 | if (((struct rtable*)skb->dst)->fl.iif == 0) | |
899 | break; | |
900 | igmp_heard_report(in_dev, ih->group); | |
901 | break; | |
902 | case IGMP_PIM: | |
903 | #ifdef CONFIG_IP_PIMSM_V1 | |
904 | in_dev_put(in_dev); | |
905 | return pim_rcv_v1(skb); | |
906 | #endif | |
907 | case IGMP_DVMRP: | |
908 | case IGMP_TRACE: | |
909 | case IGMP_HOST_LEAVE_MESSAGE: | |
910 | case IGMP_MTRACE: | |
911 | case IGMP_MTRACE_RESP: | |
912 | break; | |
913 | default: | |
64ce2073 | 914 | NETDEBUG(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type); |
1da177e4 | 915 | } |
fb286bb2 HX |
916 | |
917 | drop: | |
1da177e4 LT |
918 | in_dev_put(in_dev); |
919 | kfree_skb(skb); | |
920 | return 0; | |
921 | } | |
922 | ||
923 | #endif | |
924 | ||
925 | ||
926 | /* | |
927 | * Add a filter to a device | |
928 | */ | |
929 | ||
930 | static void ip_mc_filter_add(struct in_device *in_dev, u32 addr) | |
931 | { | |
932 | char buf[MAX_ADDR_LEN]; | |
933 | struct net_device *dev = in_dev->dev; | |
934 | ||
935 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
936 | We will get multicast token leakage, when IFF_MULTICAST | |
937 | is changed. This check should be done in dev->set_multicast_list | |
938 | routine. Something sort of: | |
939 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
940 | --ANK | |
941 | */ | |
942 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
943 | dev_mc_add(dev,buf,dev->addr_len,0); | |
944 | } | |
945 | ||
946 | /* | |
947 | * Remove a filter from a device | |
948 | */ | |
949 | ||
950 | static void ip_mc_filter_del(struct in_device *in_dev, u32 addr) | |
951 | { | |
952 | char buf[MAX_ADDR_LEN]; | |
953 | struct net_device *dev = in_dev->dev; | |
954 | ||
955 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
956 | dev_mc_delete(dev,buf,dev->addr_len,0); | |
957 | } | |
958 | ||
959 | #ifdef CONFIG_IP_MULTICAST | |
960 | /* | |
961 | * deleted ip_mc_list manipulation | |
962 | */ | |
963 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
964 | { | |
965 | struct ip_mc_list *pmc; | |
966 | ||
967 | /* this is an "ip_mc_list" for convenience; only the fields below | |
968 | * are actually used. In particular, the refcnt and users are not | |
969 | * used for management of the delete list. Using the same structure | |
970 | * for deleted items allows change reports to use common code with | |
971 | * non-deleted or query-response MCA's. | |
972 | */ | |
973 | pmc = (struct ip_mc_list *)kmalloc(sizeof(*pmc), GFP_KERNEL); | |
974 | if (!pmc) | |
975 | return; | |
976 | memset(pmc, 0, sizeof(*pmc)); | |
977 | spin_lock_bh(&im->lock); | |
978 | pmc->interface = im->interface; | |
979 | in_dev_hold(in_dev); | |
980 | pmc->multiaddr = im->multiaddr; | |
981 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
982 | IGMP_Unsolicited_Report_Count; | |
983 | pmc->sfmode = im->sfmode; | |
984 | if (pmc->sfmode == MCAST_INCLUDE) { | |
985 | struct ip_sf_list *psf; | |
986 | ||
987 | pmc->tomb = im->tomb; | |
988 | pmc->sources = im->sources; | |
989 | im->tomb = im->sources = NULL; | |
990 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
991 | psf->sf_crcount = pmc->crcount; | |
992 | } | |
993 | spin_unlock_bh(&im->lock); | |
994 | ||
995 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
996 | pmc->next = in_dev->mc_tomb; | |
997 | in_dev->mc_tomb = pmc; | |
998 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
999 | } | |
1000 | ||
1001 | static void igmpv3_del_delrec(struct in_device *in_dev, __u32 multiaddr) | |
1002 | { | |
1003 | struct ip_mc_list *pmc, *pmc_prev; | |
1004 | struct ip_sf_list *psf, *psf_next; | |
1005 | ||
1006 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1007 | pmc_prev = NULL; | |
1008 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { | |
1009 | if (pmc->multiaddr == multiaddr) | |
1010 | break; | |
1011 | pmc_prev = pmc; | |
1012 | } | |
1013 | if (pmc) { | |
1014 | if (pmc_prev) | |
1015 | pmc_prev->next = pmc->next; | |
1016 | else | |
1017 | in_dev->mc_tomb = pmc->next; | |
1018 | } | |
1019 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1020 | if (pmc) { | |
1021 | for (psf=pmc->tomb; psf; psf=psf_next) { | |
1022 | psf_next = psf->sf_next; | |
1023 | kfree(psf); | |
1024 | } | |
1025 | in_dev_put(pmc->interface); | |
1026 | kfree(pmc); | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1031 | { | |
1032 | struct ip_mc_list *pmc, *nextpmc; | |
1033 | ||
1034 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1035 | pmc = in_dev->mc_tomb; | |
1036 | in_dev->mc_tomb = NULL; | |
1037 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1038 | ||
1039 | for (; pmc; pmc = nextpmc) { | |
1040 | nextpmc = pmc->next; | |
1041 | ip_mc_clear_src(pmc); | |
1042 | in_dev_put(pmc->interface); | |
1043 | kfree(pmc); | |
1044 | } | |
1045 | /* clear dead sources, too */ | |
1046 | read_lock(&in_dev->mc_list_lock); | |
1047 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1048 | struct ip_sf_list *psf, *psf_next; | |
1049 | ||
1050 | spin_lock_bh(&pmc->lock); | |
1051 | psf = pmc->tomb; | |
1052 | pmc->tomb = NULL; | |
1053 | spin_unlock_bh(&pmc->lock); | |
1054 | for (; psf; psf=psf_next) { | |
1055 | psf_next = psf->sf_next; | |
1056 | kfree(psf); | |
1057 | } | |
1058 | } | |
1059 | read_unlock(&in_dev->mc_list_lock); | |
1060 | } | |
1061 | #endif | |
1062 | ||
1063 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1064 | { | |
1065 | struct in_device *in_dev = im->interface; | |
1066 | #ifdef CONFIG_IP_MULTICAST | |
1067 | int reporter; | |
1068 | #endif | |
1069 | ||
1070 | if (im->loaded) { | |
1071 | im->loaded = 0; | |
1072 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1073 | } | |
1074 | ||
1075 | #ifdef CONFIG_IP_MULTICAST | |
1076 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1077 | return; | |
1078 | ||
1079 | reporter = im->reporter; | |
1080 | igmp_stop_timer(im); | |
1081 | ||
1082 | if (!in_dev->dead) { | |
1083 | if (IGMP_V1_SEEN(in_dev)) | |
1084 | goto done; | |
1085 | if (IGMP_V2_SEEN(in_dev)) { | |
1086 | if (reporter) | |
1087 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
1088 | goto done; | |
1089 | } | |
1090 | /* IGMPv3 */ | |
1091 | igmpv3_add_delrec(in_dev, im); | |
1092 | ||
1093 | igmp_ifc_event(in_dev); | |
1094 | } | |
1095 | done: | |
1096 | #endif | |
1097 | ip_mc_clear_src(im); | |
1098 | } | |
1099 | ||
1100 | static void igmp_group_added(struct ip_mc_list *im) | |
1101 | { | |
1102 | struct in_device *in_dev = im->interface; | |
1103 | ||
1104 | if (im->loaded == 0) { | |
1105 | im->loaded = 1; | |
1106 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1107 | } | |
1108 | ||
1109 | #ifdef CONFIG_IP_MULTICAST | |
1110 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1111 | return; | |
1112 | ||
1113 | if (in_dev->dead) | |
1114 | return; | |
1115 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1116 | spin_lock_bh(&im->lock); | |
1117 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1118 | spin_unlock_bh(&im->lock); | |
1119 | return; | |
1120 | } | |
1121 | /* else, v3 */ | |
1122 | ||
1123 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1124 | IGMP_Unsolicited_Report_Count; | |
1125 | igmp_ifc_event(in_dev); | |
1126 | #endif | |
1127 | } | |
1128 | ||
1129 | ||
1130 | /* | |
1131 | * Multicast list managers | |
1132 | */ | |
1133 | ||
1134 | ||
1135 | /* | |
1136 | * A socket has joined a multicast group on device dev. | |
1137 | */ | |
1138 | ||
1139 | void ip_mc_inc_group(struct in_device *in_dev, u32 addr) | |
1140 | { | |
1141 | struct ip_mc_list *im; | |
1142 | ||
1143 | ASSERT_RTNL(); | |
1144 | ||
1145 | for (im=in_dev->mc_list; im; im=im->next) { | |
1146 | if (im->multiaddr == addr) { | |
1147 | im->users++; | |
1148 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1149 | goto out; | |
1150 | } | |
1151 | } | |
1152 | ||
1153 | im = (struct ip_mc_list *)kmalloc(sizeof(*im), GFP_KERNEL); | |
1154 | if (!im) | |
1155 | goto out; | |
1156 | ||
1157 | im->users=1; | |
1158 | im->interface=in_dev; | |
1159 | in_dev_hold(in_dev); | |
1160 | im->multiaddr=addr; | |
1161 | /* initial mode is (EX, empty) */ | |
1162 | im->sfmode = MCAST_EXCLUDE; | |
1163 | im->sfcount[MCAST_INCLUDE] = 0; | |
1164 | im->sfcount[MCAST_EXCLUDE] = 1; | |
1165 | im->sources = NULL; | |
1166 | im->tomb = NULL; | |
1167 | im->crcount = 0; | |
1168 | atomic_set(&im->refcnt, 1); | |
1169 | spin_lock_init(&im->lock); | |
1170 | #ifdef CONFIG_IP_MULTICAST | |
1171 | im->tm_running=0; | |
1172 | init_timer(&im->timer); | |
1173 | im->timer.data=(unsigned long)im; | |
1174 | im->timer.function=&igmp_timer_expire; | |
1175 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; | |
1176 | im->reporter = 0; | |
1177 | im->gsquery = 0; | |
1178 | #endif | |
1179 | im->loaded = 0; | |
1180 | write_lock_bh(&in_dev->mc_list_lock); | |
1181 | im->next=in_dev->mc_list; | |
1182 | in_dev->mc_list=im; | |
1183 | write_unlock_bh(&in_dev->mc_list_lock); | |
1184 | #ifdef CONFIG_IP_MULTICAST | |
1185 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1186 | #endif | |
1187 | igmp_group_added(im); | |
1188 | if (!in_dev->dead) | |
1189 | ip_rt_multicast_event(in_dev); | |
1190 | out: | |
1191 | return; | |
1192 | } | |
1193 | ||
1194 | /* | |
1195 | * A socket has left a multicast group on device dev | |
1196 | */ | |
1197 | ||
1198 | void ip_mc_dec_group(struct in_device *in_dev, u32 addr) | |
1199 | { | |
1200 | struct ip_mc_list *i, **ip; | |
1201 | ||
1202 | ASSERT_RTNL(); | |
1203 | ||
1204 | for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { | |
1205 | if (i->multiaddr==addr) { | |
1206 | if (--i->users == 0) { | |
1207 | write_lock_bh(&in_dev->mc_list_lock); | |
1208 | *ip = i->next; | |
1209 | write_unlock_bh(&in_dev->mc_list_lock); | |
1210 | igmp_group_dropped(i); | |
1211 | ||
1212 | if (!in_dev->dead) | |
1213 | ip_rt_multicast_event(in_dev); | |
1214 | ||
1215 | ip_ma_put(i); | |
1216 | return; | |
1217 | } | |
1218 | break; | |
1219 | } | |
1220 | } | |
1221 | } | |
1222 | ||
1223 | /* Device going down */ | |
1224 | ||
1225 | void ip_mc_down(struct in_device *in_dev) | |
1226 | { | |
1227 | struct ip_mc_list *i; | |
1228 | ||
1229 | ASSERT_RTNL(); | |
1230 | ||
1231 | for (i=in_dev->mc_list; i; i=i->next) | |
1232 | igmp_group_dropped(i); | |
1233 | ||
1234 | #ifdef CONFIG_IP_MULTICAST | |
1235 | in_dev->mr_ifc_count = 0; | |
1236 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1237 | __in_dev_put(in_dev); | |
1238 | in_dev->mr_gq_running = 0; | |
1239 | if (del_timer(&in_dev->mr_gq_timer)) | |
1240 | __in_dev_put(in_dev); | |
1241 | igmpv3_clear_delrec(in_dev); | |
1242 | #endif | |
1243 | ||
1244 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1245 | } | |
1246 | ||
1247 | void ip_mc_init_dev(struct in_device *in_dev) | |
1248 | { | |
1249 | ASSERT_RTNL(); | |
1250 | ||
1251 | in_dev->mc_tomb = NULL; | |
1252 | #ifdef CONFIG_IP_MULTICAST | |
1253 | in_dev->mr_gq_running = 0; | |
1254 | init_timer(&in_dev->mr_gq_timer); | |
1255 | in_dev->mr_gq_timer.data=(unsigned long) in_dev; | |
1256 | in_dev->mr_gq_timer.function=&igmp_gq_timer_expire; | |
1257 | in_dev->mr_ifc_count = 0; | |
1258 | init_timer(&in_dev->mr_ifc_timer); | |
1259 | in_dev->mr_ifc_timer.data=(unsigned long) in_dev; | |
1260 | in_dev->mr_ifc_timer.function=&igmp_ifc_timer_expire; | |
1261 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; | |
1262 | #endif | |
1263 | ||
1264 | rwlock_init(&in_dev->mc_list_lock); | |
1265 | spin_lock_init(&in_dev->mc_tomb_lock); | |
1266 | } | |
1267 | ||
1268 | /* Device going up */ | |
1269 | ||
1270 | void ip_mc_up(struct in_device *in_dev) | |
1271 | { | |
1272 | struct ip_mc_list *i; | |
1273 | ||
1274 | ASSERT_RTNL(); | |
1275 | ||
1276 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1277 | ||
1278 | for (i=in_dev->mc_list; i; i=i->next) | |
1279 | igmp_group_added(i); | |
1280 | } | |
1281 | ||
1282 | /* | |
1283 | * Device is about to be destroyed: clean up. | |
1284 | */ | |
1285 | ||
1286 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1287 | { | |
1288 | struct ip_mc_list *i; | |
1289 | ||
1290 | ASSERT_RTNL(); | |
1291 | ||
1292 | /* Deactivate timers */ | |
1293 | ip_mc_down(in_dev); | |
1294 | ||
1295 | write_lock_bh(&in_dev->mc_list_lock); | |
1296 | while ((i = in_dev->mc_list) != NULL) { | |
1297 | in_dev->mc_list = i->next; | |
1298 | write_unlock_bh(&in_dev->mc_list_lock); | |
1299 | ||
1300 | igmp_group_dropped(i); | |
1301 | ip_ma_put(i); | |
1302 | ||
1303 | write_lock_bh(&in_dev->mc_list_lock); | |
1304 | } | |
1305 | write_unlock_bh(&in_dev->mc_list_lock); | |
1306 | } | |
1307 | ||
1308 | static struct in_device * ip_mc_find_dev(struct ip_mreqn *imr) | |
1309 | { | |
1310 | struct flowi fl = { .nl_u = { .ip4_u = | |
1311 | { .daddr = imr->imr_multiaddr.s_addr } } }; | |
1312 | struct rtable *rt; | |
1313 | struct net_device *dev = NULL; | |
1314 | struct in_device *idev = NULL; | |
1315 | ||
1316 | if (imr->imr_ifindex) { | |
1317 | idev = inetdev_by_index(imr->imr_ifindex); | |
1318 | if (idev) | |
1319 | __in_dev_put(idev); | |
1320 | return idev; | |
1321 | } | |
1322 | if (imr->imr_address.s_addr) { | |
1323 | dev = ip_dev_find(imr->imr_address.s_addr); | |
1324 | if (!dev) | |
1325 | return NULL; | |
1326 | __dev_put(dev); | |
1327 | } | |
1328 | ||
1329 | if (!dev && !ip_route_output_key(&rt, &fl)) { | |
1330 | dev = rt->u.dst.dev; | |
1331 | ip_rt_put(rt); | |
1332 | } | |
1333 | if (dev) { | |
1334 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1335 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1336 | } |
1337 | return idev; | |
1338 | } | |
1339 | ||
1340 | /* | |
1341 | * Join a socket to a group | |
1342 | */ | |
1343 | int sysctl_igmp_max_memberships = IP_MAX_MEMBERSHIPS; | |
1344 | int sysctl_igmp_max_msf = IP_MAX_MSF; | |
1345 | ||
1346 | ||
1347 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
1348 | __u32 *psfsrc) | |
1349 | { | |
1350 | struct ip_sf_list *psf, *psf_prev; | |
1351 | int rv = 0; | |
1352 | ||
1353 | psf_prev = NULL; | |
1354 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1355 | if (psf->sf_inaddr == *psfsrc) | |
1356 | break; | |
1357 | psf_prev = psf; | |
1358 | } | |
1359 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1360 | /* source filter not found, or count wrong => bug */ | |
1361 | return -ESRCH; | |
1362 | } | |
1363 | psf->sf_count[sfmode]--; | |
1364 | if (psf->sf_count[sfmode] == 0) { | |
1365 | ip_rt_multicast_event(pmc->interface); | |
1366 | } | |
1367 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1368 | #ifdef CONFIG_IP_MULTICAST | |
1369 | struct in_device *in_dev = pmc->interface; | |
1370 | #endif | |
1371 | ||
1372 | /* no more filters for this source */ | |
1373 | if (psf_prev) | |
1374 | psf_prev->sf_next = psf->sf_next; | |
1375 | else | |
1376 | pmc->sources = psf->sf_next; | |
1377 | #ifdef CONFIG_IP_MULTICAST | |
1378 | if (psf->sf_oldin && | |
1379 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
1380 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1381 | IGMP_Unsolicited_Report_Count; | |
1382 | psf->sf_next = pmc->tomb; | |
1383 | pmc->tomb = psf; | |
1384 | rv = 1; | |
1385 | } else | |
1386 | #endif | |
1387 | kfree(psf); | |
1388 | } | |
1389 | return rv; | |
1390 | } | |
1391 | ||
1392 | #ifndef CONFIG_IP_MULTICAST | |
1393 | #define igmp_ifc_event(x) do { } while (0) | |
1394 | #endif | |
1395 | ||
1396 | static int ip_mc_del_src(struct in_device *in_dev, __u32 *pmca, int sfmode, | |
1397 | int sfcount, __u32 *psfsrc, int delta) | |
1398 | { | |
1399 | struct ip_mc_list *pmc; | |
1400 | int changerec = 0; | |
1401 | int i, err; | |
1402 | ||
1403 | if (!in_dev) | |
1404 | return -ENODEV; | |
1405 | read_lock(&in_dev->mc_list_lock); | |
1406 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1407 | if (*pmca == pmc->multiaddr) | |
1408 | break; | |
1409 | } | |
1410 | if (!pmc) { | |
1411 | /* MCA not found?? bug */ | |
1412 | read_unlock(&in_dev->mc_list_lock); | |
1413 | return -ESRCH; | |
1414 | } | |
1415 | spin_lock_bh(&pmc->lock); | |
1416 | read_unlock(&in_dev->mc_list_lock); | |
1417 | #ifdef CONFIG_IP_MULTICAST | |
1418 | sf_markstate(pmc); | |
1419 | #endif | |
1420 | if (!delta) { | |
1421 | err = -EINVAL; | |
1422 | if (!pmc->sfcount[sfmode]) | |
1423 | goto out_unlock; | |
1424 | pmc->sfcount[sfmode]--; | |
1425 | } | |
1426 | err = 0; | |
1427 | for (i=0; i<sfcount; i++) { | |
1428 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1429 | ||
1430 | changerec |= rv > 0; | |
1431 | if (!err && rv < 0) | |
1432 | err = rv; | |
1433 | } | |
1434 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1435 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1436 | pmc->sfcount[MCAST_INCLUDE]) { | |
1437 | #ifdef CONFIG_IP_MULTICAST | |
1438 | struct ip_sf_list *psf; | |
1439 | #endif | |
1440 | ||
1441 | /* filter mode change */ | |
1442 | pmc->sfmode = MCAST_INCLUDE; | |
1443 | #ifdef CONFIG_IP_MULTICAST | |
1444 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1445 | IGMP_Unsolicited_Report_Count; | |
1446 | in_dev->mr_ifc_count = pmc->crcount; | |
1447 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1448 | psf->sf_crcount = 0; | |
1449 | igmp_ifc_event(pmc->interface); | |
1450 | } else if (sf_setstate(pmc) || changerec) { | |
1451 | igmp_ifc_event(pmc->interface); | |
1452 | #endif | |
1453 | } | |
1454 | out_unlock: | |
1455 | spin_unlock_bh(&pmc->lock); | |
1456 | return err; | |
1457 | } | |
1458 | ||
1459 | /* | |
1460 | * Add multicast single-source filter to the interface list | |
1461 | */ | |
1462 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
1463 | __u32 *psfsrc, int delta) | |
1464 | { | |
1465 | struct ip_sf_list *psf, *psf_prev; | |
1466 | ||
1467 | psf_prev = NULL; | |
1468 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1469 | if (psf->sf_inaddr == *psfsrc) | |
1470 | break; | |
1471 | psf_prev = psf; | |
1472 | } | |
1473 | if (!psf) { | |
1474 | psf = (struct ip_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC); | |
1475 | if (!psf) | |
1476 | return -ENOBUFS; | |
1477 | memset(psf, 0, sizeof(*psf)); | |
1478 | psf->sf_inaddr = *psfsrc; | |
1479 | if (psf_prev) { | |
1480 | psf_prev->sf_next = psf; | |
1481 | } else | |
1482 | pmc->sources = psf; | |
1483 | } | |
1484 | psf->sf_count[sfmode]++; | |
1485 | if (psf->sf_count[sfmode] == 1) { | |
1486 | ip_rt_multicast_event(pmc->interface); | |
1487 | } | |
1488 | return 0; | |
1489 | } | |
1490 | ||
1491 | #ifdef CONFIG_IP_MULTICAST | |
1492 | static void sf_markstate(struct ip_mc_list *pmc) | |
1493 | { | |
1494 | struct ip_sf_list *psf; | |
1495 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1496 | ||
1497 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1498 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1499 | psf->sf_oldin = mca_xcount == | |
1500 | psf->sf_count[MCAST_EXCLUDE] && | |
1501 | !psf->sf_count[MCAST_INCLUDE]; | |
1502 | } else | |
1503 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1504 | } | |
1505 | ||
1506 | static int sf_setstate(struct ip_mc_list *pmc) | |
1507 | { | |
1508 | struct ip_sf_list *psf; | |
1509 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1510 | int qrv = pmc->interface->mr_qrv; | |
1511 | int new_in, rv; | |
1512 | ||
1513 | rv = 0; | |
1514 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1515 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1516 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1517 | !psf->sf_count[MCAST_INCLUDE]; | |
1518 | } else | |
1519 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
1520 | if (new_in != psf->sf_oldin) { | |
1521 | psf->sf_crcount = qrv; | |
1522 | rv++; | |
1523 | } | |
1524 | } | |
1525 | return rv; | |
1526 | } | |
1527 | #endif | |
1528 | ||
1529 | /* | |
1530 | * Add multicast source filter list to the interface list | |
1531 | */ | |
1532 | static int ip_mc_add_src(struct in_device *in_dev, __u32 *pmca, int sfmode, | |
1533 | int sfcount, __u32 *psfsrc, int delta) | |
1534 | { | |
1535 | struct ip_mc_list *pmc; | |
1536 | int isexclude; | |
1537 | int i, err; | |
1538 | ||
1539 | if (!in_dev) | |
1540 | return -ENODEV; | |
1541 | read_lock(&in_dev->mc_list_lock); | |
1542 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1543 | if (*pmca == pmc->multiaddr) | |
1544 | break; | |
1545 | } | |
1546 | if (!pmc) { | |
1547 | /* MCA not found?? bug */ | |
1548 | read_unlock(&in_dev->mc_list_lock); | |
1549 | return -ESRCH; | |
1550 | } | |
1551 | spin_lock_bh(&pmc->lock); | |
1552 | read_unlock(&in_dev->mc_list_lock); | |
1553 | ||
1554 | #ifdef CONFIG_IP_MULTICAST | |
1555 | sf_markstate(pmc); | |
1556 | #endif | |
1557 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1558 | if (!delta) | |
1559 | pmc->sfcount[sfmode]++; | |
1560 | err = 0; | |
1561 | for (i=0; i<sfcount; i++) { | |
1562 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); | |
1563 | if (err) | |
1564 | break; | |
1565 | } | |
1566 | if (err) { | |
1567 | int j; | |
1568 | ||
1569 | pmc->sfcount[sfmode]--; | |
1570 | for (j=0; j<i; j++) | |
1571 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1572 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { | |
1573 | #ifdef CONFIG_IP_MULTICAST | |
1574 | struct in_device *in_dev = pmc->interface; | |
1575 | struct ip_sf_list *psf; | |
1576 | #endif | |
1577 | ||
1578 | /* filter mode change */ | |
1579 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1580 | pmc->sfmode = MCAST_EXCLUDE; | |
1581 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1582 | pmc->sfmode = MCAST_INCLUDE; | |
1583 | #ifdef CONFIG_IP_MULTICAST | |
1584 | /* else no filters; keep old mode for reports */ | |
1585 | ||
1586 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1587 | IGMP_Unsolicited_Report_Count; | |
1588 | in_dev->mr_ifc_count = pmc->crcount; | |
1589 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1590 | psf->sf_crcount = 0; | |
1591 | igmp_ifc_event(in_dev); | |
1592 | } else if (sf_setstate(pmc)) { | |
1593 | igmp_ifc_event(in_dev); | |
1594 | #endif | |
1595 | } | |
1596 | spin_unlock_bh(&pmc->lock); | |
1597 | return err; | |
1598 | } | |
1599 | ||
1600 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1601 | { | |
1602 | struct ip_sf_list *psf, *nextpsf; | |
1603 | ||
1604 | for (psf=pmc->tomb; psf; psf=nextpsf) { | |
1605 | nextpsf = psf->sf_next; | |
1606 | kfree(psf); | |
1607 | } | |
1608 | pmc->tomb = NULL; | |
1609 | for (psf=pmc->sources; psf; psf=nextpsf) { | |
1610 | nextpsf = psf->sf_next; | |
1611 | kfree(psf); | |
1612 | } | |
1613 | pmc->sources = NULL; | |
1614 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1615 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1616 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1617 | } | |
1618 | ||
1619 | ||
1620 | /* | |
1621 | * Join a multicast group | |
1622 | */ | |
1623 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1624 | { | |
1625 | int err; | |
1626 | u32 addr = imr->imr_multiaddr.s_addr; | |
ca9b907d | 1627 | struct ip_mc_socklist *iml=NULL, *i; |
1da177e4 LT |
1628 | struct in_device *in_dev; |
1629 | struct inet_sock *inet = inet_sk(sk); | |
ca9b907d | 1630 | int ifindex; |
1da177e4 LT |
1631 | int count = 0; |
1632 | ||
1633 | if (!MULTICAST(addr)) | |
1634 | return -EINVAL; | |
1635 | ||
1636 | rtnl_shlock(); | |
1637 | ||
1638 | in_dev = ip_mc_find_dev(imr); | |
1639 | ||
1640 | if (!in_dev) { | |
1641 | iml = NULL; | |
1642 | err = -ENODEV; | |
1643 | goto done; | |
1644 | } | |
1645 | ||
1da177e4 | 1646 | err = -EADDRINUSE; |
ca9b907d | 1647 | ifindex = imr->imr_ifindex; |
1da177e4 | 1648 | for (i = inet->mc_list; i; i = i->next) { |
ca9b907d DS |
1649 | if (i->multi.imr_multiaddr.s_addr == addr && |
1650 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1651 | goto done; |
1da177e4 LT |
1652 | count++; |
1653 | } | |
1654 | err = -ENOBUFS; | |
ca9b907d DS |
1655 | if (count >= sysctl_igmp_max_memberships) |
1656 | goto done; | |
1657 | iml = (struct ip_mc_socklist *)sock_kmalloc(sk,sizeof(*iml),GFP_KERNEL); | |
1658 | if (iml == NULL) | |
1da177e4 | 1659 | goto done; |
ca9b907d | 1660 | |
1da177e4 LT |
1661 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1662 | iml->next = inet->mc_list; | |
1da177e4 LT |
1663 | iml->sflist = NULL; |
1664 | iml->sfmode = MCAST_EXCLUDE; | |
1665 | inet->mc_list = iml; | |
1666 | ip_mc_inc_group(in_dev, addr); | |
1da177e4 | 1667 | err = 0; |
1da177e4 LT |
1668 | done: |
1669 | rtnl_shunlock(); | |
1da177e4 LT |
1670 | return err; |
1671 | } | |
1672 | ||
1673 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
1674 | struct in_device *in_dev) | |
1675 | { | |
1676 | int err; | |
1677 | ||
1678 | if (iml->sflist == 0) { | |
1679 | /* any-source empty exclude case */ | |
1680 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1681 | iml->sfmode, 0, NULL, 0); | |
1682 | } | |
1683 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1684 | iml->sfmode, iml->sflist->sl_count, | |
1685 | iml->sflist->sl_addr, 0); | |
1686 | sock_kfree_s(sk, iml->sflist, IP_SFLSIZE(iml->sflist->sl_max)); | |
1687 | iml->sflist = NULL; | |
1688 | return err; | |
1689 | } | |
1690 | ||
1691 | /* | |
1692 | * Ask a socket to leave a group. | |
1693 | */ | |
1694 | ||
1695 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1696 | { | |
1697 | struct inet_sock *inet = inet_sk(sk); | |
1698 | struct ip_mc_socklist *iml, **imlp; | |
84b42bae DS |
1699 | struct in_device *in_dev; |
1700 | u32 group = imr->imr_multiaddr.s_addr; | |
1701 | u32 ifindex; | |
1da177e4 LT |
1702 | |
1703 | rtnl_lock(); | |
84b42bae DS |
1704 | in_dev = ip_mc_find_dev(imr); |
1705 | if (!in_dev) { | |
1706 | rtnl_unlock(); | |
1707 | return -ENODEV; | |
1708 | } | |
1709 | ifindex = imr->imr_ifindex; | |
1da177e4 | 1710 | for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { |
84b42bae DS |
1711 | if (iml->multi.imr_multiaddr.s_addr == group && |
1712 | iml->multi.imr_ifindex == ifindex) { | |
1713 | (void) ip_mc_leave_src(sk, iml, in_dev); | |
1da177e4 LT |
1714 | |
1715 | *imlp = iml->next; | |
1716 | ||
84b42bae | 1717 | ip_mc_dec_group(in_dev, group); |
1da177e4 LT |
1718 | rtnl_unlock(); |
1719 | sock_kfree_s(sk, iml, sizeof(*iml)); | |
1720 | return 0; | |
1721 | } | |
1722 | } | |
1723 | rtnl_unlock(); | |
1724 | return -EADDRNOTAVAIL; | |
1725 | } | |
1726 | ||
1727 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1728 | ip_mreq_source *mreqs, int ifindex) | |
1729 | { | |
1730 | int err; | |
1731 | struct ip_mreqn imr; | |
1732 | u32 addr = mreqs->imr_multiaddr; | |
1733 | struct ip_mc_socklist *pmc; | |
1734 | struct in_device *in_dev = NULL; | |
1735 | struct inet_sock *inet = inet_sk(sk); | |
1736 | struct ip_sf_socklist *psl; | |
8cdaaa15 | 1737 | int leavegroup = 0; |
1da177e4 LT |
1738 | int i, j, rv; |
1739 | ||
1740 | if (!MULTICAST(addr)) | |
1741 | return -EINVAL; | |
1742 | ||
1743 | rtnl_shlock(); | |
1744 | ||
1745 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1746 | imr.imr_address.s_addr = mreqs->imr_interface; | |
1747 | imr.imr_ifindex = ifindex; | |
1748 | in_dev = ip_mc_find_dev(&imr); | |
1749 | ||
1750 | if (!in_dev) { | |
1751 | err = -ENODEV; | |
1752 | goto done; | |
1753 | } | |
1754 | err = -EADDRNOTAVAIL; | |
1755 | ||
1756 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
ca9b907d DS |
1757 | if (pmc->multi.imr_multiaddr.s_addr == imr.imr_multiaddr.s_addr |
1758 | && pmc->multi.imr_ifindex == imr.imr_ifindex) | |
1da177e4 LT |
1759 | break; |
1760 | } | |
917f2f10 DS |
1761 | if (!pmc) { /* must have a prior join */ |
1762 | err = -EINVAL; | |
1da177e4 | 1763 | goto done; |
917f2f10 | 1764 | } |
1da177e4 LT |
1765 | /* if a source filter was set, must be the same mode as before */ |
1766 | if (pmc->sflist) { | |
917f2f10 DS |
1767 | if (pmc->sfmode != omode) { |
1768 | err = -EINVAL; | |
1da177e4 | 1769 | goto done; |
917f2f10 | 1770 | } |
1da177e4 LT |
1771 | } else if (pmc->sfmode != omode) { |
1772 | /* allow mode switches for empty-set filters */ | |
1773 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
1774 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, | |
1775 | NULL, 0); | |
1776 | pmc->sfmode = omode; | |
1777 | } | |
1778 | ||
1779 | psl = pmc->sflist; | |
1780 | if (!add) { | |
1781 | if (!psl) | |
917f2f10 | 1782 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 LT |
1783 | rv = !0; |
1784 | for (i=0; i<psl->sl_count; i++) { | |
1785 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
1786 | sizeof(__u32)); | |
1787 | if (rv == 0) | |
1788 | break; | |
1789 | } | |
1790 | if (rv) /* source not found */ | |
917f2f10 | 1791 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 1792 | |
8cdaaa15 DS |
1793 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1794 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
1795 | leavegroup = 1; | |
1796 | goto done; | |
1797 | } | |
1798 | ||
1da177e4 LT |
1799 | /* update the interface filter */ |
1800 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, | |
1801 | &mreqs->imr_sourceaddr, 1); | |
1802 | ||
1803 | for (j=i+1; j<psl->sl_count; j++) | |
1804 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
1805 | psl->sl_count--; | |
1806 | err = 0; | |
1807 | goto done; | |
1808 | } | |
1809 | /* else, add a new source to the filter */ | |
1810 | ||
1811 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
1812 | err = -ENOBUFS; | |
1813 | goto done; | |
1814 | } | |
1815 | if (!psl || psl->sl_count == psl->sl_max) { | |
1816 | struct ip_sf_socklist *newpsl; | |
1817 | int count = IP_SFBLOCK; | |
1818 | ||
1819 | if (psl) | |
1820 | count += psl->sl_max; | |
1821 | newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk, | |
1822 | IP_SFLSIZE(count), GFP_KERNEL); | |
1823 | if (!newpsl) { | |
1824 | err = -ENOBUFS; | |
1825 | goto done; | |
1826 | } | |
1827 | newpsl->sl_max = count; | |
1828 | newpsl->sl_count = count - IP_SFBLOCK; | |
1829 | if (psl) { | |
1830 | for (i=0; i<psl->sl_count; i++) | |
1831 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
1832 | sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); | |
1833 | } | |
1834 | pmc->sflist = psl = newpsl; | |
1835 | } | |
1836 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
1837 | for (i=0; i<psl->sl_count; i++) { | |
1838 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
1839 | sizeof(__u32)); | |
1840 | if (rv == 0) | |
1841 | break; | |
1842 | } | |
1843 | if (rv == 0) /* address already there is an error */ | |
1844 | goto done; | |
1845 | for (j=psl->sl_count-1; j>=i; j--) | |
1846 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
1847 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
1848 | psl->sl_count++; | |
1849 | err = 0; | |
1850 | /* update the interface list */ | |
1851 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, | |
1852 | &mreqs->imr_sourceaddr, 1); | |
1853 | done: | |
1854 | rtnl_shunlock(); | |
8cdaaa15 DS |
1855 | if (leavegroup) |
1856 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
1857 | return err; |
1858 | } | |
1859 | ||
1860 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
1861 | { | |
9951f036 | 1862 | int err = 0; |
1da177e4 LT |
1863 | struct ip_mreqn imr; |
1864 | u32 addr = msf->imsf_multiaddr; | |
1865 | struct ip_mc_socklist *pmc; | |
1866 | struct in_device *in_dev; | |
1867 | struct inet_sock *inet = inet_sk(sk); | |
1868 | struct ip_sf_socklist *newpsl, *psl; | |
9951f036 | 1869 | int leavegroup = 0; |
1da177e4 LT |
1870 | |
1871 | if (!MULTICAST(addr)) | |
1872 | return -EINVAL; | |
1873 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
1874 | msf->imsf_fmode != MCAST_EXCLUDE) | |
1875 | return -EINVAL; | |
1876 | ||
1877 | rtnl_shlock(); | |
1878 | ||
1879 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
1880 | imr.imr_address.s_addr = msf->imsf_interface; | |
1881 | imr.imr_ifindex = ifindex; | |
1882 | in_dev = ip_mc_find_dev(&imr); | |
1883 | ||
1884 | if (!in_dev) { | |
1885 | err = -ENODEV; | |
1886 | goto done; | |
1887 | } | |
1da177e4 | 1888 | |
9951f036 DS |
1889 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1890 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
1891 | leavegroup = 1; | |
1892 | goto done; | |
1893 | } | |
1894 | ||
1da177e4 LT |
1895 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { |
1896 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
1897 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
1898 | break; | |
1899 | } | |
917f2f10 DS |
1900 | if (!pmc) { /* must have a prior join */ |
1901 | err = -EINVAL; | |
1da177e4 | 1902 | goto done; |
917f2f10 | 1903 | } |
1da177e4 LT |
1904 | if (msf->imsf_numsrc) { |
1905 | newpsl = (struct ip_sf_socklist *)sock_kmalloc(sk, | |
1906 | IP_SFLSIZE(msf->imsf_numsrc), GFP_KERNEL); | |
1907 | if (!newpsl) { | |
1908 | err = -ENOBUFS; | |
1909 | goto done; | |
1910 | } | |
1911 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
1912 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
1913 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
1914 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
1915 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
1916 | if (err) { | |
1917 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
1918 | goto done; | |
1919 | } | |
8713dbf0 | 1920 | } else { |
1da177e4 | 1921 | newpsl = NULL; |
8713dbf0 YZ |
1922 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
1923 | msf->imsf_fmode, 0, NULL, 0); | |
1924 | } | |
1da177e4 LT |
1925 | psl = pmc->sflist; |
1926 | if (psl) { | |
1927 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
1928 | psl->sl_count, psl->sl_addr, 0); | |
1929 | sock_kfree_s(sk, psl, IP_SFLSIZE(psl->sl_max)); | |
1930 | } else | |
1931 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
1932 | 0, NULL, 0); | |
1933 | pmc->sflist = newpsl; | |
1934 | pmc->sfmode = msf->imsf_fmode; | |
917f2f10 | 1935 | err = 0; |
1da177e4 LT |
1936 | done: |
1937 | rtnl_shunlock(); | |
9951f036 DS |
1938 | if (leavegroup) |
1939 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
1940 | return err; |
1941 | } | |
1942 | ||
1943 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
1944 | struct ip_msfilter __user *optval, int __user *optlen) | |
1945 | { | |
1946 | int err, len, count, copycount; | |
1947 | struct ip_mreqn imr; | |
1948 | u32 addr = msf->imsf_multiaddr; | |
1949 | struct ip_mc_socklist *pmc; | |
1950 | struct in_device *in_dev; | |
1951 | struct inet_sock *inet = inet_sk(sk); | |
1952 | struct ip_sf_socklist *psl; | |
1953 | ||
1954 | if (!MULTICAST(addr)) | |
1955 | return -EINVAL; | |
1956 | ||
1957 | rtnl_shlock(); | |
1958 | ||
1959 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
1960 | imr.imr_address.s_addr = msf->imsf_interface; | |
1961 | imr.imr_ifindex = 0; | |
1962 | in_dev = ip_mc_find_dev(&imr); | |
1963 | ||
1964 | if (!in_dev) { | |
1965 | err = -ENODEV; | |
1966 | goto done; | |
1967 | } | |
1968 | err = -EADDRNOTAVAIL; | |
1969 | ||
1970 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
1971 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
1972 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
1973 | break; | |
1974 | } | |
1975 | if (!pmc) /* must have a prior join */ | |
1976 | goto done; | |
1977 | msf->imsf_fmode = pmc->sfmode; | |
1978 | psl = pmc->sflist; | |
1979 | rtnl_shunlock(); | |
1980 | if (!psl) { | |
1981 | len = 0; | |
1982 | count = 0; | |
1983 | } else { | |
1984 | count = psl->sl_count; | |
1985 | } | |
1986 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
1987 | len = copycount * sizeof(psl->sl_addr[0]); | |
1988 | msf->imsf_numsrc = count; | |
1989 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
1990 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
1991 | return -EFAULT; | |
1992 | } | |
1993 | if (len && | |
1994 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
1995 | return -EFAULT; | |
1996 | return 0; | |
1997 | done: | |
1998 | rtnl_shunlock(); | |
1999 | return err; | |
2000 | } | |
2001 | ||
2002 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2003 | struct group_filter __user *optval, int __user *optlen) | |
2004 | { | |
2005 | int err, i, count, copycount; | |
2006 | struct sockaddr_in *psin; | |
2007 | u32 addr; | |
2008 | struct ip_mc_socklist *pmc; | |
2009 | struct inet_sock *inet = inet_sk(sk); | |
2010 | struct ip_sf_socklist *psl; | |
2011 | ||
2012 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2013 | if (psin->sin_family != AF_INET) | |
2014 | return -EINVAL; | |
2015 | addr = psin->sin_addr.s_addr; | |
2016 | if (!MULTICAST(addr)) | |
2017 | return -EINVAL; | |
2018 | ||
2019 | rtnl_shlock(); | |
2020 | ||
2021 | err = -EADDRNOTAVAIL; | |
2022 | ||
2023 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2024 | if (pmc->multi.imr_multiaddr.s_addr == addr && | |
2025 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2026 | break; | |
2027 | } | |
2028 | if (!pmc) /* must have a prior join */ | |
2029 | goto done; | |
2030 | gsf->gf_fmode = pmc->sfmode; | |
2031 | psl = pmc->sflist; | |
2032 | rtnl_shunlock(); | |
2033 | count = psl ? psl->sl_count : 0; | |
2034 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2035 | gsf->gf_numsrc = count; | |
2036 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2037 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2038 | return -EFAULT; | |
2039 | } | |
2040 | for (i=0; i<copycount; i++) { | |
2041 | struct sockaddr_in *psin; | |
2042 | struct sockaddr_storage ss; | |
2043 | ||
2044 | psin = (struct sockaddr_in *)&ss; | |
2045 | memset(&ss, 0, sizeof(ss)); | |
2046 | psin->sin_family = AF_INET; | |
2047 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2048 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2049 | return -EFAULT; | |
2050 | } | |
2051 | return 0; | |
2052 | done: | |
2053 | rtnl_shunlock(); | |
2054 | return err; | |
2055 | } | |
2056 | ||
2057 | /* | |
2058 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2059 | */ | |
2060 | int ip_mc_sf_allow(struct sock *sk, u32 loc_addr, u32 rmt_addr, int dif) | |
2061 | { | |
2062 | struct inet_sock *inet = inet_sk(sk); | |
2063 | struct ip_mc_socklist *pmc; | |
2064 | struct ip_sf_socklist *psl; | |
2065 | int i; | |
2066 | ||
2067 | if (!MULTICAST(loc_addr)) | |
2068 | return 1; | |
2069 | ||
2070 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2071 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && | |
2072 | pmc->multi.imr_ifindex == dif) | |
2073 | break; | |
2074 | } | |
2075 | if (!pmc) | |
2076 | return 1; | |
2077 | psl = pmc->sflist; | |
2078 | if (!psl) | |
2079 | return pmc->sfmode == MCAST_EXCLUDE; | |
2080 | ||
2081 | for (i=0; i<psl->sl_count; i++) { | |
2082 | if (psl->sl_addr[i] == rmt_addr) | |
2083 | break; | |
2084 | } | |
2085 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) | |
2086 | return 0; | |
2087 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) | |
2088 | return 0; | |
2089 | return 1; | |
2090 | } | |
2091 | ||
2092 | /* | |
2093 | * A socket is closing. | |
2094 | */ | |
2095 | ||
2096 | void ip_mc_drop_socket(struct sock *sk) | |
2097 | { | |
2098 | struct inet_sock *inet = inet_sk(sk); | |
2099 | struct ip_mc_socklist *iml; | |
2100 | ||
2101 | if (inet->mc_list == NULL) | |
2102 | return; | |
2103 | ||
2104 | rtnl_lock(); | |
2105 | while ((iml = inet->mc_list) != NULL) { | |
2106 | struct in_device *in_dev; | |
2107 | inet->mc_list = iml->next; | |
2108 | ||
2109 | if ((in_dev = inetdev_by_index(iml->multi.imr_ifindex)) != NULL) { | |
2110 | (void) ip_mc_leave_src(sk, iml, in_dev); | |
2111 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); | |
2112 | in_dev_put(in_dev); | |
2113 | } | |
2114 | sock_kfree_s(sk, iml, sizeof(*iml)); | |
2115 | ||
2116 | } | |
2117 | rtnl_unlock(); | |
2118 | } | |
2119 | ||
2120 | int ip_check_mc(struct in_device *in_dev, u32 mc_addr, u32 src_addr, u16 proto) | |
2121 | { | |
2122 | struct ip_mc_list *im; | |
2123 | struct ip_sf_list *psf; | |
2124 | int rv = 0; | |
2125 | ||
2126 | read_lock(&in_dev->mc_list_lock); | |
2127 | for (im=in_dev->mc_list; im; im=im->next) { | |
2128 | if (im->multiaddr == mc_addr) | |
2129 | break; | |
2130 | } | |
2131 | if (im && proto == IPPROTO_IGMP) { | |
2132 | rv = 1; | |
2133 | } else if (im) { | |
2134 | if (src_addr) { | |
2135 | for (psf=im->sources; psf; psf=psf->sf_next) { | |
2136 | if (psf->sf_inaddr == src_addr) | |
2137 | break; | |
2138 | } | |
2139 | if (psf) | |
2140 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2141 | psf->sf_count[MCAST_EXCLUDE] != | |
2142 | im->sfcount[MCAST_EXCLUDE]; | |
2143 | else | |
2144 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2145 | } else | |
2146 | rv = 1; /* unspecified source; tentatively allow */ | |
2147 | } | |
2148 | read_unlock(&in_dev->mc_list_lock); | |
2149 | return rv; | |
2150 | } | |
2151 | ||
2152 | #if defined(CONFIG_PROC_FS) | |
2153 | struct igmp_mc_iter_state { | |
2154 | struct net_device *dev; | |
2155 | struct in_device *in_dev; | |
2156 | }; | |
2157 | ||
2158 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2159 | ||
2160 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2161 | { | |
2162 | struct ip_mc_list *im = NULL; | |
2163 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2164 | ||
2165 | for (state->dev = dev_base, state->in_dev = NULL; | |
2166 | state->dev; | |
2167 | state->dev = state->dev->next) { | |
2168 | struct in_device *in_dev; | |
2169 | in_dev = in_dev_get(state->dev); | |
2170 | if (!in_dev) | |
2171 | continue; | |
2172 | read_lock(&in_dev->mc_list_lock); | |
2173 | im = in_dev->mc_list; | |
2174 | if (im) { | |
2175 | state->in_dev = in_dev; | |
2176 | break; | |
2177 | } | |
2178 | read_unlock(&in_dev->mc_list_lock); | |
2179 | in_dev_put(in_dev); | |
2180 | } | |
2181 | return im; | |
2182 | } | |
2183 | ||
2184 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2185 | { | |
2186 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2187 | im = im->next; | |
2188 | while (!im) { | |
2189 | if (likely(state->in_dev != NULL)) { | |
2190 | read_unlock(&state->in_dev->mc_list_lock); | |
2191 | in_dev_put(state->in_dev); | |
2192 | } | |
2193 | state->dev = state->dev->next; | |
2194 | if (!state->dev) { | |
2195 | state->in_dev = NULL; | |
2196 | break; | |
2197 | } | |
2198 | state->in_dev = in_dev_get(state->dev); | |
2199 | if (!state->in_dev) | |
2200 | continue; | |
2201 | read_lock(&state->in_dev->mc_list_lock); | |
2202 | im = state->in_dev->mc_list; | |
2203 | } | |
2204 | return im; | |
2205 | } | |
2206 | ||
2207 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2208 | { | |
2209 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2210 | if (im) | |
2211 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2212 | --pos; | |
2213 | return pos ? NULL : im; | |
2214 | } | |
2215 | ||
2216 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
2217 | { | |
2218 | read_lock(&dev_base_lock); | |
2219 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2220 | } | |
2221 | ||
2222 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2223 | { | |
2224 | struct ip_mc_list *im; | |
2225 | if (v == SEQ_START_TOKEN) | |
2226 | im = igmp_mc_get_first(seq); | |
2227 | else | |
2228 | im = igmp_mc_get_next(seq, v); | |
2229 | ++*pos; | |
2230 | return im; | |
2231 | } | |
2232 | ||
2233 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
2234 | { | |
2235 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2236 | if (likely(state->in_dev != NULL)) { | |
2237 | read_unlock(&state->in_dev->mc_list_lock); | |
2238 | in_dev_put(state->in_dev); | |
2239 | state->in_dev = NULL; | |
2240 | } | |
2241 | state->dev = NULL; | |
2242 | read_unlock(&dev_base_lock); | |
2243 | } | |
2244 | ||
2245 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2246 | { | |
2247 | if (v == SEQ_START_TOKEN) | |
2248 | seq_puts(seq, | |
2249 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); | |
2250 | else { | |
2251 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2252 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2253 | char *querier; | |
2254 | #ifdef CONFIG_IP_MULTICAST | |
2255 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2256 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2257 | "V3"; | |
2258 | #else | |
2259 | querier = "NONE"; | |
2260 | #endif | |
2261 | ||
2262 | if (state->in_dev->mc_list == im) { | |
2263 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", | |
2264 | state->dev->ifindex, state->dev->name, state->dev->mc_count, querier); | |
2265 | } | |
2266 | ||
2267 | seq_printf(seq, | |
2268 | "\t\t\t\t%08lX %5d %d:%08lX\t\t%d\n", | |
2269 | im->multiaddr, im->users, | |
2270 | im->tm_running, im->tm_running ? | |
2271 | jiffies_to_clock_t(im->timer.expires-jiffies) : 0, | |
2272 | im->reporter); | |
2273 | } | |
2274 | return 0; | |
2275 | } | |
2276 | ||
2277 | static struct seq_operations igmp_mc_seq_ops = { | |
2278 | .start = igmp_mc_seq_start, | |
2279 | .next = igmp_mc_seq_next, | |
2280 | .stop = igmp_mc_seq_stop, | |
2281 | .show = igmp_mc_seq_show, | |
2282 | }; | |
2283 | ||
2284 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2285 | { | |
2286 | struct seq_file *seq; | |
2287 | int rc = -ENOMEM; | |
2288 | struct igmp_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
2289 | ||
2290 | if (!s) | |
2291 | goto out; | |
2292 | rc = seq_open(file, &igmp_mc_seq_ops); | |
2293 | if (rc) | |
2294 | goto out_kfree; | |
2295 | ||
2296 | seq = file->private_data; | |
2297 | seq->private = s; | |
2298 | memset(s, 0, sizeof(*s)); | |
2299 | out: | |
2300 | return rc; | |
2301 | out_kfree: | |
2302 | kfree(s); | |
2303 | goto out; | |
2304 | } | |
2305 | ||
2306 | static struct file_operations igmp_mc_seq_fops = { | |
2307 | .owner = THIS_MODULE, | |
2308 | .open = igmp_mc_seq_open, | |
2309 | .read = seq_read, | |
2310 | .llseek = seq_lseek, | |
2311 | .release = seq_release_private, | |
2312 | }; | |
2313 | ||
2314 | struct igmp_mcf_iter_state { | |
2315 | struct net_device *dev; | |
2316 | struct in_device *idev; | |
2317 | struct ip_mc_list *im; | |
2318 | }; | |
2319 | ||
2320 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2321 | ||
2322 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2323 | { | |
2324 | struct ip_sf_list *psf = NULL; | |
2325 | struct ip_mc_list *im = NULL; | |
2326 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2327 | ||
2328 | for (state->dev = dev_base, state->idev = NULL, state->im = NULL; | |
2329 | state->dev; | |
2330 | state->dev = state->dev->next) { | |
2331 | struct in_device *idev; | |
2332 | idev = in_dev_get(state->dev); | |
2333 | if (unlikely(idev == NULL)) | |
2334 | continue; | |
2335 | read_lock(&idev->mc_list_lock); | |
2336 | im = idev->mc_list; | |
2337 | if (likely(im != NULL)) { | |
2338 | spin_lock_bh(&im->lock); | |
2339 | psf = im->sources; | |
2340 | if (likely(psf != NULL)) { | |
2341 | state->im = im; | |
2342 | state->idev = idev; | |
2343 | break; | |
2344 | } | |
2345 | spin_unlock_bh(&im->lock); | |
2346 | } | |
2347 | read_unlock(&idev->mc_list_lock); | |
2348 | in_dev_put(idev); | |
2349 | } | |
2350 | return psf; | |
2351 | } | |
2352 | ||
2353 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2354 | { | |
2355 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2356 | ||
2357 | psf = psf->sf_next; | |
2358 | while (!psf) { | |
2359 | spin_unlock_bh(&state->im->lock); | |
2360 | state->im = state->im->next; | |
2361 | while (!state->im) { | |
2362 | if (likely(state->idev != NULL)) { | |
2363 | read_unlock(&state->idev->mc_list_lock); | |
2364 | in_dev_put(state->idev); | |
2365 | } | |
2366 | state->dev = state->dev->next; | |
2367 | if (!state->dev) { | |
2368 | state->idev = NULL; | |
2369 | goto out; | |
2370 | } | |
2371 | state->idev = in_dev_get(state->dev); | |
2372 | if (!state->idev) | |
2373 | continue; | |
2374 | read_lock(&state->idev->mc_list_lock); | |
2375 | state->im = state->idev->mc_list; | |
2376 | } | |
2377 | if (!state->im) | |
2378 | break; | |
2379 | spin_lock_bh(&state->im->lock); | |
2380 | psf = state->im->sources; | |
2381 | } | |
2382 | out: | |
2383 | return psf; | |
2384 | } | |
2385 | ||
2386 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2387 | { | |
2388 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2389 | if (psf) | |
2390 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2391 | --pos; | |
2392 | return pos ? NULL : psf; | |
2393 | } | |
2394 | ||
2395 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
2396 | { | |
2397 | read_lock(&dev_base_lock); | |
2398 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2399 | } | |
2400 | ||
2401 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2402 | { | |
2403 | struct ip_sf_list *psf; | |
2404 | if (v == SEQ_START_TOKEN) | |
2405 | psf = igmp_mcf_get_first(seq); | |
2406 | else | |
2407 | psf = igmp_mcf_get_next(seq, v); | |
2408 | ++*pos; | |
2409 | return psf; | |
2410 | } | |
2411 | ||
2412 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
2413 | { | |
2414 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2415 | if (likely(state->im != NULL)) { | |
2416 | spin_unlock_bh(&state->im->lock); | |
2417 | state->im = NULL; | |
2418 | } | |
2419 | if (likely(state->idev != NULL)) { | |
2420 | read_unlock(&state->idev->mc_list_lock); | |
2421 | in_dev_put(state->idev); | |
2422 | state->idev = NULL; | |
2423 | } | |
2424 | state->dev = NULL; | |
2425 | read_unlock(&dev_base_lock); | |
2426 | } | |
2427 | ||
2428 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2429 | { | |
2430 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2431 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2432 | ||
2433 | if (v == SEQ_START_TOKEN) { | |
2434 | seq_printf(seq, | |
2435 | "%3s %6s " | |
2436 | "%10s %10s %6s %6s\n", "Idx", | |
2437 | "Device", "MCA", | |
2438 | "SRC", "INC", "EXC"); | |
2439 | } else { | |
2440 | seq_printf(seq, | |
2441 | "%3d %6.6s 0x%08x " | |
2442 | "0x%08x %6lu %6lu\n", | |
2443 | state->dev->ifindex, state->dev->name, | |
2444 | ntohl(state->im->multiaddr), | |
2445 | ntohl(psf->sf_inaddr), | |
2446 | psf->sf_count[MCAST_INCLUDE], | |
2447 | psf->sf_count[MCAST_EXCLUDE]); | |
2448 | } | |
2449 | return 0; | |
2450 | } | |
2451 | ||
2452 | static struct seq_operations igmp_mcf_seq_ops = { | |
2453 | .start = igmp_mcf_seq_start, | |
2454 | .next = igmp_mcf_seq_next, | |
2455 | .stop = igmp_mcf_seq_stop, | |
2456 | .show = igmp_mcf_seq_show, | |
2457 | }; | |
2458 | ||
2459 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2460 | { | |
2461 | struct seq_file *seq; | |
2462 | int rc = -ENOMEM; | |
2463 | struct igmp_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); | |
2464 | ||
2465 | if (!s) | |
2466 | goto out; | |
2467 | rc = seq_open(file, &igmp_mcf_seq_ops); | |
2468 | if (rc) | |
2469 | goto out_kfree; | |
2470 | ||
2471 | seq = file->private_data; | |
2472 | seq->private = s; | |
2473 | memset(s, 0, sizeof(*s)); | |
2474 | out: | |
2475 | return rc; | |
2476 | out_kfree: | |
2477 | kfree(s); | |
2478 | goto out; | |
2479 | } | |
2480 | ||
2481 | static struct file_operations igmp_mcf_seq_fops = { | |
2482 | .owner = THIS_MODULE, | |
2483 | .open = igmp_mcf_seq_open, | |
2484 | .read = seq_read, | |
2485 | .llseek = seq_lseek, | |
2486 | .release = seq_release_private, | |
2487 | }; | |
2488 | ||
2489 | int __init igmp_mc_proc_init(void) | |
2490 | { | |
2491 | proc_net_fops_create("igmp", S_IRUGO, &igmp_mc_seq_fops); | |
2492 | proc_net_fops_create("mcfilter", S_IRUGO, &igmp_mcf_seq_fops); | |
2493 | return 0; | |
2494 | } | |
2495 | #endif | |
2496 | ||
2497 | EXPORT_SYMBOL(ip_mc_dec_group); | |
2498 | EXPORT_SYMBOL(ip_mc_inc_group); | |
2499 | EXPORT_SYMBOL(ip_mc_join_group); |