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1 | // SPDX-License-Identifier: GPL-2.0-or-later | |
2 | /* | |
3 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
4 | * | |
5 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
6 | * been a further revision of this protocol since which is now supported. | |
7 | * | |
8 | * If you have trouble with this module be careful what gcc you have used, | |
9 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
10 | * seems to fall out with gcc 2.6.2. | |
11 | * | |
12 | * Authors: | |
13 | * Alan Cox <alan@lxorguk.ukuu.org.uk> | |
14 | * | |
15 | * Fixes: | |
16 | * | |
17 | * Alan Cox : Added lots of __inline__ to optimise | |
18 | * the memory usage of all the tiny little | |
19 | * functions. | |
20 | * Alan Cox : Dumped the header building experiment. | |
21 | * Alan Cox : Minor tweaks ready for multicast routing | |
22 | * and extended IGMP protocol. | |
23 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
24 | * writes utterly bogus code otherwise (sigh) | |
25 | * fixed IGMP loopback to behave in the manner | |
26 | * desired by mrouted, fixed the fact it has been | |
27 | * broken since 1.3.6 and cleaned up a few minor | |
28 | * points. | |
29 | * | |
30 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
31 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
32 | * The enhancements are mainly based on Steve Deering's | |
33 | * ipmulti-3.5 source code. | |
34 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
35 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
36 | * the mrouted version on that device. | |
37 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
38 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
39 | * to identify the multicast router version | |
40 | * and do what the IGMP version 2 specified. | |
41 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
42 | * Tsu-Sheng Tsao if the specified time expired. | |
43 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
44 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
45 | * Christian Daudt : igmp timer wasn't set for local group | |
46 | * memberships but was being deleted, | |
47 | * which caused a "del_timer() called | |
48 | * from %p with timer not initialized\n" | |
49 | * message (960131). | |
50 | * Christian Daudt : removed del_timer from | |
51 | * igmp_timer_expire function (960205). | |
52 | * Christian Daudt : igmp_heard_report now only calls | |
53 | * igmp_timer_expire if tm->running is | |
54 | * true (960216). | |
55 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
56 | * igmp_heard_query never trigger. Expiry | |
57 | * miscalculation fixed in igmp_heard_query | |
58 | * and random() made to return unsigned to | |
59 | * prevent negative expiry times. | |
60 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
61 | * fix from pending 2.1.x patches. | |
62 | * Alan Cox: Forget to enable FDDI support earlier. | |
63 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
64 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
65 | * David L Stevens: IGMPv3 support, with help from | |
66 | * Vinay Kulkarni | |
67 | */ | |
68 | ||
69 | #include <linux/module.h> | |
70 | #include <linux/slab.h> | |
71 | #include <linux/uaccess.h> | |
72 | #include <linux/types.h> | |
73 | #include <linux/kernel.h> | |
74 | #include <linux/jiffies.h> | |
75 | #include <linux/string.h> | |
76 | #include <linux/socket.h> | |
77 | #include <linux/sockios.h> | |
78 | #include <linux/in.h> | |
79 | #include <linux/inet.h> | |
80 | #include <linux/netdevice.h> | |
81 | #include <linux/skbuff.h> | |
82 | #include <linux/inetdevice.h> | |
83 | #include <linux/igmp.h> | |
84 | #include <linux/if_arp.h> | |
85 | #include <linux/rtnetlink.h> | |
86 | #include <linux/times.h> | |
87 | #include <linux/pkt_sched.h> | |
88 | #include <linux/byteorder/generic.h> | |
89 | ||
90 | #include <net/net_namespace.h> | |
91 | #include <net/arp.h> | |
92 | #include <net/ip.h> | |
93 | #include <net/protocol.h> | |
94 | #include <net/route.h> | |
95 | #include <net/sock.h> | |
96 | #include <net/checksum.h> | |
97 | #include <net/inet_common.h> | |
98 | #include <linux/netfilter_ipv4.h> | |
99 | #ifdef CONFIG_IP_MROUTE | |
100 | #include <linux/mroute.h> | |
101 | #endif | |
102 | #ifdef CONFIG_PROC_FS | |
103 | #include <linux/proc_fs.h> | |
104 | #include <linux/seq_file.h> | |
105 | #endif | |
106 | ||
107 | #ifdef CONFIG_IP_MULTICAST | |
108 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
109 | ||
110 | #define IGMP_QUERY_INTERVAL (125*HZ) | |
111 | #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) | |
112 | ||
113 | #define IGMP_INITIAL_REPORT_DELAY (1) | |
114 | ||
115 | /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! | |
116 | * IGMP specs require to report membership immediately after | |
117 | * joining a group, but we delay the first report by a | |
118 | * small interval. It seems more natural and still does not | |
119 | * contradict to specs provided this delay is small enough. | |
120 | */ | |
121 | ||
122 | #define IGMP_V1_SEEN(in_dev) \ | |
123 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ | |
124 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ | |
125 | ((in_dev)->mr_v1_seen && \ | |
126 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
127 | #define IGMP_V2_SEEN(in_dev) \ | |
128 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ | |
129 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ | |
130 | ((in_dev)->mr_v2_seen && \ | |
131 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
132 | ||
133 | static int unsolicited_report_interval(struct in_device *in_dev) | |
134 | { | |
135 | int interval_ms, interval_jiffies; | |
136 | ||
137 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
138 | interval_ms = IN_DEV_CONF_GET( | |
139 | in_dev, | |
140 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
141 | else /* v3 */ | |
142 | interval_ms = IN_DEV_CONF_GET( | |
143 | in_dev, | |
144 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
145 | ||
146 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
147 | ||
148 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
149 | * we always return a positive value. | |
150 | */ | |
151 | if (interval_jiffies <= 0) | |
152 | interval_jiffies = 1; | |
153 | return interval_jiffies; | |
154 | } | |
155 | ||
156 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, | |
157 | gfp_t gfp); | |
158 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); | |
159 | static void igmpv3_clear_delrec(struct in_device *in_dev); | |
160 | static int sf_setstate(struct ip_mc_list *pmc); | |
161 | static void sf_markstate(struct ip_mc_list *pmc); | |
162 | #endif | |
163 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
164 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, | |
165 | int sfcount, __be32 *psfsrc, int delta); | |
166 | ||
167 | static void ip_ma_put(struct ip_mc_list *im) | |
168 | { | |
169 | if (refcount_dec_and_test(&im->refcnt)) { | |
170 | in_dev_put(im->interface); | |
171 | kfree_rcu(im, rcu); | |
172 | } | |
173 | } | |
174 | ||
175 | #define for_each_pmc_rcu(in_dev, pmc) \ | |
176 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
177 | pmc != NULL; \ | |
178 | pmc = rcu_dereference(pmc->next_rcu)) | |
179 | ||
180 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
181 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
182 | pmc != NULL; \ | |
183 | pmc = rtnl_dereference(pmc->next_rcu)) | |
184 | ||
185 | static void ip_sf_list_clear_all(struct ip_sf_list *psf) | |
186 | { | |
187 | struct ip_sf_list *next; | |
188 | ||
189 | while (psf) { | |
190 | next = psf->sf_next; | |
191 | kfree(psf); | |
192 | psf = next; | |
193 | } | |
194 | } | |
195 | ||
196 | #ifdef CONFIG_IP_MULTICAST | |
197 | ||
198 | /* | |
199 | * Timer management | |
200 | */ | |
201 | ||
202 | static void igmp_stop_timer(struct ip_mc_list *im) | |
203 | { | |
204 | spin_lock_bh(&im->lock); | |
205 | if (del_timer(&im->timer)) | |
206 | refcount_dec(&im->refcnt); | |
207 | im->tm_running = 0; | |
208 | im->reporter = 0; | |
209 | im->unsolicit_count = 0; | |
210 | spin_unlock_bh(&im->lock); | |
211 | } | |
212 | ||
213 | /* It must be called with locked im->lock */ | |
214 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
215 | { | |
216 | int tv = prandom_u32() % max_delay; | |
217 | ||
218 | im->tm_running = 1; | |
219 | if (!mod_timer(&im->timer, jiffies+tv+2)) | |
220 | refcount_inc(&im->refcnt); | |
221 | } | |
222 | ||
223 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
224 | { | |
225 | int tv = prandom_u32() % in_dev->mr_maxdelay; | |
226 | unsigned long exp = jiffies + tv + 2; | |
227 | ||
228 | if (in_dev->mr_gq_running && | |
229 | time_after_eq(exp, (in_dev->mr_gq_timer).expires)) | |
230 | return; | |
231 | ||
232 | in_dev->mr_gq_running = 1; | |
233 | if (!mod_timer(&in_dev->mr_gq_timer, exp)) | |
234 | in_dev_hold(in_dev); | |
235 | } | |
236 | ||
237 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
238 | { | |
239 | int tv = prandom_u32() % delay; | |
240 | ||
241 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
242 | in_dev_hold(in_dev); | |
243 | } | |
244 | ||
245 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
246 | { | |
247 | spin_lock_bh(&im->lock); | |
248 | im->unsolicit_count = 0; | |
249 | if (del_timer(&im->timer)) { | |
250 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
251 | add_timer(&im->timer); | |
252 | im->tm_running = 1; | |
253 | spin_unlock_bh(&im->lock); | |
254 | return; | |
255 | } | |
256 | refcount_dec(&im->refcnt); | |
257 | } | |
258 | igmp_start_timer(im, max_delay); | |
259 | spin_unlock_bh(&im->lock); | |
260 | } | |
261 | ||
262 | ||
263 | /* | |
264 | * Send an IGMP report. | |
265 | */ | |
266 | ||
267 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
268 | ||
269 | ||
270 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
271 | int gdeleted, int sdeleted) | |
272 | { | |
273 | switch (type) { | |
274 | case IGMPV3_MODE_IS_INCLUDE: | |
275 | case IGMPV3_MODE_IS_EXCLUDE: | |
276 | if (gdeleted || sdeleted) | |
277 | return 0; | |
278 | if (!(pmc->gsquery && !psf->sf_gsresp)) { | |
279 | if (pmc->sfmode == MCAST_INCLUDE) | |
280 | return 1; | |
281 | /* don't include if this source is excluded | |
282 | * in all filters | |
283 | */ | |
284 | if (psf->sf_count[MCAST_INCLUDE]) | |
285 | return type == IGMPV3_MODE_IS_INCLUDE; | |
286 | return pmc->sfcount[MCAST_EXCLUDE] == | |
287 | psf->sf_count[MCAST_EXCLUDE]; | |
288 | } | |
289 | return 0; | |
290 | case IGMPV3_CHANGE_TO_INCLUDE: | |
291 | if (gdeleted || sdeleted) | |
292 | return 0; | |
293 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
294 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
295 | if (gdeleted || sdeleted) | |
296 | return 0; | |
297 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
298 | psf->sf_count[MCAST_INCLUDE]) | |
299 | return 0; | |
300 | return pmc->sfcount[MCAST_EXCLUDE] == | |
301 | psf->sf_count[MCAST_EXCLUDE]; | |
302 | case IGMPV3_ALLOW_NEW_SOURCES: | |
303 | if (gdeleted || !psf->sf_crcount) | |
304 | return 0; | |
305 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
306 | case IGMPV3_BLOCK_OLD_SOURCES: | |
307 | if (pmc->sfmode == MCAST_INCLUDE) | |
308 | return gdeleted || (psf->sf_crcount && sdeleted); | |
309 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
310 | } | |
311 | return 0; | |
312 | } | |
313 | ||
314 | static int | |
315 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
316 | { | |
317 | struct ip_sf_list *psf; | |
318 | int scount = 0; | |
319 | ||
320 | for (psf = pmc->sources; psf; psf = psf->sf_next) { | |
321 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) | |
322 | continue; | |
323 | scount++; | |
324 | } | |
325 | return scount; | |
326 | } | |
327 | ||
328 | /* source address selection per RFC 3376 section 4.2.13 */ | |
329 | static __be32 igmpv3_get_srcaddr(struct net_device *dev, | |
330 | const struct flowi4 *fl4) | |
331 | { | |
332 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
333 | const struct in_ifaddr *ifa; | |
334 | ||
335 | if (!in_dev) | |
336 | return htonl(INADDR_ANY); | |
337 | ||
338 | in_dev_for_each_ifa_rcu(ifa, in_dev) { | |
339 | if (fl4->saddr == ifa->ifa_local) | |
340 | return fl4->saddr; | |
341 | } | |
342 | ||
343 | return htonl(INADDR_ANY); | |
344 | } | |
345 | ||
346 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) | |
347 | { | |
348 | struct sk_buff *skb; | |
349 | struct rtable *rt; | |
350 | struct iphdr *pip; | |
351 | struct igmpv3_report *pig; | |
352 | struct net *net = dev_net(dev); | |
353 | struct flowi4 fl4; | |
354 | int hlen = LL_RESERVED_SPACE(dev); | |
355 | int tlen = dev->needed_tailroom; | |
356 | unsigned int size = mtu; | |
357 | ||
358 | while (1) { | |
359 | skb = alloc_skb(size + hlen + tlen, | |
360 | GFP_ATOMIC | __GFP_NOWARN); | |
361 | if (skb) | |
362 | break; | |
363 | size >>= 1; | |
364 | if (size < 256) | |
365 | return NULL; | |
366 | } | |
367 | skb->priority = TC_PRIO_CONTROL; | |
368 | ||
369 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, | |
370 | 0, 0, | |
371 | IPPROTO_IGMP, 0, dev->ifindex); | |
372 | if (IS_ERR(rt)) { | |
373 | kfree_skb(skb); | |
374 | return NULL; | |
375 | } | |
376 | ||
377 | skb_dst_set(skb, &rt->dst); | |
378 | skb->dev = dev; | |
379 | ||
380 | skb_reserve(skb, hlen); | |
381 | skb_tailroom_reserve(skb, mtu, tlen); | |
382 | ||
383 | skb_reset_network_header(skb); | |
384 | pip = ip_hdr(skb); | |
385 | skb_put(skb, sizeof(struct iphdr) + 4); | |
386 | ||
387 | pip->version = 4; | |
388 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
389 | pip->tos = 0xc0; | |
390 | pip->frag_off = htons(IP_DF); | |
391 | pip->ttl = 1; | |
392 | pip->daddr = fl4.daddr; | |
393 | ||
394 | rcu_read_lock(); | |
395 | pip->saddr = igmpv3_get_srcaddr(dev, &fl4); | |
396 | rcu_read_unlock(); | |
397 | ||
398 | pip->protocol = IPPROTO_IGMP; | |
399 | pip->tot_len = 0; /* filled in later */ | |
400 | ip_select_ident(net, skb, NULL); | |
401 | ((u8 *)&pip[1])[0] = IPOPT_RA; | |
402 | ((u8 *)&pip[1])[1] = 4; | |
403 | ((u8 *)&pip[1])[2] = 0; | |
404 | ((u8 *)&pip[1])[3] = 0; | |
405 | ||
406 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; | |
407 | skb_put(skb, sizeof(*pig)); | |
408 | pig = igmpv3_report_hdr(skb); | |
409 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
410 | pig->resv1 = 0; | |
411 | pig->csum = 0; | |
412 | pig->resv2 = 0; | |
413 | pig->ngrec = 0; | |
414 | return skb; | |
415 | } | |
416 | ||
417 | static int igmpv3_sendpack(struct sk_buff *skb) | |
418 | { | |
419 | struct igmphdr *pig = igmp_hdr(skb); | |
420 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); | |
421 | ||
422 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); | |
423 | ||
424 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); | |
425 | } | |
426 | ||
427 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
428 | { | |
429 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); | |
430 | } | |
431 | ||
432 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
433 | int type, struct igmpv3_grec **ppgr, unsigned int mtu) | |
434 | { | |
435 | struct net_device *dev = pmc->interface->dev; | |
436 | struct igmpv3_report *pih; | |
437 | struct igmpv3_grec *pgr; | |
438 | ||
439 | if (!skb) { | |
440 | skb = igmpv3_newpack(dev, mtu); | |
441 | if (!skb) | |
442 | return NULL; | |
443 | } | |
444 | pgr = skb_put(skb, sizeof(struct igmpv3_grec)); | |
445 | pgr->grec_type = type; | |
446 | pgr->grec_auxwords = 0; | |
447 | pgr->grec_nsrcs = 0; | |
448 | pgr->grec_mca = pmc->multiaddr; | |
449 | pih = igmpv3_report_hdr(skb); | |
450 | pih->ngrec = htons(ntohs(pih->ngrec)+1); | |
451 | *ppgr = pgr; | |
452 | return skb; | |
453 | } | |
454 | ||
455 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) | |
456 | ||
457 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
458 | int type, int gdeleted, int sdeleted) | |
459 | { | |
460 | struct net_device *dev = pmc->interface->dev; | |
461 | struct net *net = dev_net(dev); | |
462 | struct igmpv3_report *pih; | |
463 | struct igmpv3_grec *pgr = NULL; | |
464 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
465 | int scount, stotal, first, isquery, truncate; | |
466 | unsigned int mtu; | |
467 | ||
468 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
469 | return skb; | |
470 | if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) | |
471 | return skb; | |
472 | ||
473 | mtu = READ_ONCE(dev->mtu); | |
474 | if (mtu < IPV4_MIN_MTU) | |
475 | return skb; | |
476 | ||
477 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
478 | type == IGMPV3_MODE_IS_EXCLUDE; | |
479 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
480 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
481 | ||
482 | stotal = scount = 0; | |
483 | ||
484 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; | |
485 | ||
486 | if (!*psf_list) | |
487 | goto empty_source; | |
488 | ||
489 | pih = skb ? igmpv3_report_hdr(skb) : NULL; | |
490 | ||
491 | /* EX and TO_EX get a fresh packet, if needed */ | |
492 | if (truncate) { | |
493 | if (pih && pih->ngrec && | |
494 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
495 | if (skb) | |
496 | igmpv3_sendpack(skb); | |
497 | skb = igmpv3_newpack(dev, mtu); | |
498 | } | |
499 | } | |
500 | first = 1; | |
501 | psf_prev = NULL; | |
502 | for (psf = *psf_list; psf; psf = psf_next) { | |
503 | __be32 *psrc; | |
504 | ||
505 | psf_next = psf->sf_next; | |
506 | ||
507 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
508 | psf_prev = psf; | |
509 | continue; | |
510 | } | |
511 | ||
512 | /* Based on RFC3376 5.1. Should not send source-list change | |
513 | * records when there is a filter mode change. | |
514 | */ | |
515 | if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || | |
516 | (!gdeleted && pmc->crcount)) && | |
517 | (type == IGMPV3_ALLOW_NEW_SOURCES || | |
518 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) | |
519 | goto decrease_sf_crcount; | |
520 | ||
521 | /* clear marks on query responses */ | |
522 | if (isquery) | |
523 | psf->sf_gsresp = 0; | |
524 | ||
525 | if (AVAILABLE(skb) < sizeof(__be32) + | |
526 | first*sizeof(struct igmpv3_grec)) { | |
527 | if (truncate && !first) | |
528 | break; /* truncate these */ | |
529 | if (pgr) | |
530 | pgr->grec_nsrcs = htons(scount); | |
531 | if (skb) | |
532 | igmpv3_sendpack(skb); | |
533 | skb = igmpv3_newpack(dev, mtu); | |
534 | first = 1; | |
535 | scount = 0; | |
536 | } | |
537 | if (first) { | |
538 | skb = add_grhead(skb, pmc, type, &pgr, mtu); | |
539 | first = 0; | |
540 | } | |
541 | if (!skb) | |
542 | return NULL; | |
543 | psrc = skb_put(skb, sizeof(__be32)); | |
544 | *psrc = psf->sf_inaddr; | |
545 | scount++; stotal++; | |
546 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || | |
547 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
548 | decrease_sf_crcount: | |
549 | psf->sf_crcount--; | |
550 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
551 | if (psf_prev) | |
552 | psf_prev->sf_next = psf->sf_next; | |
553 | else | |
554 | *psf_list = psf->sf_next; | |
555 | kfree(psf); | |
556 | continue; | |
557 | } | |
558 | } | |
559 | psf_prev = psf; | |
560 | } | |
561 | ||
562 | empty_source: | |
563 | if (!stotal) { | |
564 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
565 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
566 | return skb; | |
567 | if (pmc->crcount || isquery) { | |
568 | /* make sure we have room for group header */ | |
569 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { | |
570 | igmpv3_sendpack(skb); | |
571 | skb = NULL; /* add_grhead will get a new one */ | |
572 | } | |
573 | skb = add_grhead(skb, pmc, type, &pgr, mtu); | |
574 | } | |
575 | } | |
576 | if (pgr) | |
577 | pgr->grec_nsrcs = htons(scount); | |
578 | ||
579 | if (isquery) | |
580 | pmc->gsquery = 0; /* clear query state on report */ | |
581 | return skb; | |
582 | } | |
583 | ||
584 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
585 | { | |
586 | struct sk_buff *skb = NULL; | |
587 | struct net *net = dev_net(in_dev->dev); | |
588 | int type; | |
589 | ||
590 | if (!pmc) { | |
591 | rcu_read_lock(); | |
592 | for_each_pmc_rcu(in_dev, pmc) { | |
593 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
594 | continue; | |
595 | if (ipv4_is_local_multicast(pmc->multiaddr) && | |
596 | !net->ipv4.sysctl_igmp_llm_reports) | |
597 | continue; | |
598 | spin_lock_bh(&pmc->lock); | |
599 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
600 | type = IGMPV3_MODE_IS_EXCLUDE; | |
601 | else | |
602 | type = IGMPV3_MODE_IS_INCLUDE; | |
603 | skb = add_grec(skb, pmc, type, 0, 0); | |
604 | spin_unlock_bh(&pmc->lock); | |
605 | } | |
606 | rcu_read_unlock(); | |
607 | } else { | |
608 | spin_lock_bh(&pmc->lock); | |
609 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
610 | type = IGMPV3_MODE_IS_EXCLUDE; | |
611 | else | |
612 | type = IGMPV3_MODE_IS_INCLUDE; | |
613 | skb = add_grec(skb, pmc, type, 0, 0); | |
614 | spin_unlock_bh(&pmc->lock); | |
615 | } | |
616 | if (!skb) | |
617 | return 0; | |
618 | return igmpv3_sendpack(skb); | |
619 | } | |
620 | ||
621 | /* | |
622 | * remove zero-count source records from a source filter list | |
623 | */ | |
624 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
625 | { | |
626 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
627 | ||
628 | psf_prev = NULL; | |
629 | for (psf = *ppsf; psf; psf = psf_next) { | |
630 | psf_next = psf->sf_next; | |
631 | if (psf->sf_crcount == 0) { | |
632 | if (psf_prev) | |
633 | psf_prev->sf_next = psf->sf_next; | |
634 | else | |
635 | *ppsf = psf->sf_next; | |
636 | kfree(psf); | |
637 | } else | |
638 | psf_prev = psf; | |
639 | } | |
640 | } | |
641 | ||
642 | static void kfree_pmc(struct ip_mc_list *pmc) | |
643 | { | |
644 | ip_sf_list_clear_all(pmc->sources); | |
645 | ip_sf_list_clear_all(pmc->tomb); | |
646 | kfree(pmc); | |
647 | } | |
648 | ||
649 | static void igmpv3_send_cr(struct in_device *in_dev) | |
650 | { | |
651 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
652 | struct sk_buff *skb = NULL; | |
653 | int type, dtype; | |
654 | ||
655 | rcu_read_lock(); | |
656 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
657 | ||
658 | /* deleted MCA's */ | |
659 | pmc_prev = NULL; | |
660 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { | |
661 | pmc_next = pmc->next; | |
662 | if (pmc->sfmode == MCAST_INCLUDE) { | |
663 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
664 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
665 | skb = add_grec(skb, pmc, type, 1, 0); | |
666 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
667 | } | |
668 | if (pmc->crcount) { | |
669 | if (pmc->sfmode == MCAST_EXCLUDE) { | |
670 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
671 | skb = add_grec(skb, pmc, type, 1, 0); | |
672 | } | |
673 | pmc->crcount--; | |
674 | if (pmc->crcount == 0) { | |
675 | igmpv3_clear_zeros(&pmc->tomb); | |
676 | igmpv3_clear_zeros(&pmc->sources); | |
677 | } | |
678 | } | |
679 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
680 | if (pmc_prev) | |
681 | pmc_prev->next = pmc_next; | |
682 | else | |
683 | in_dev->mc_tomb = pmc_next; | |
684 | in_dev_put(pmc->interface); | |
685 | kfree_pmc(pmc); | |
686 | } else | |
687 | pmc_prev = pmc; | |
688 | } | |
689 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
690 | ||
691 | /* change recs */ | |
692 | for_each_pmc_rcu(in_dev, pmc) { | |
693 | spin_lock_bh(&pmc->lock); | |
694 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
695 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
696 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
697 | } else { | |
698 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
699 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
700 | } | |
701 | skb = add_grec(skb, pmc, type, 0, 0); | |
702 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
703 | ||
704 | /* filter mode changes */ | |
705 | if (pmc->crcount) { | |
706 | if (pmc->sfmode == MCAST_EXCLUDE) | |
707 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
708 | else | |
709 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
710 | skb = add_grec(skb, pmc, type, 0, 0); | |
711 | pmc->crcount--; | |
712 | } | |
713 | spin_unlock_bh(&pmc->lock); | |
714 | } | |
715 | rcu_read_unlock(); | |
716 | ||
717 | if (!skb) | |
718 | return; | |
719 | (void) igmpv3_sendpack(skb); | |
720 | } | |
721 | ||
722 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
723 | int type) | |
724 | { | |
725 | struct sk_buff *skb; | |
726 | struct iphdr *iph; | |
727 | struct igmphdr *ih; | |
728 | struct rtable *rt; | |
729 | struct net_device *dev = in_dev->dev; | |
730 | struct net *net = dev_net(dev); | |
731 | __be32 group = pmc ? pmc->multiaddr : 0; | |
732 | struct flowi4 fl4; | |
733 | __be32 dst; | |
734 | int hlen, tlen; | |
735 | ||
736 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
737 | return igmpv3_send_report(in_dev, pmc); | |
738 | ||
739 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) | |
740 | return 0; | |
741 | ||
742 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
743 | dst = IGMP_ALL_ROUTER; | |
744 | else | |
745 | dst = group; | |
746 | ||
747 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, | |
748 | 0, 0, | |
749 | IPPROTO_IGMP, 0, dev->ifindex); | |
750 | if (IS_ERR(rt)) | |
751 | return -1; | |
752 | ||
753 | hlen = LL_RESERVED_SPACE(dev); | |
754 | tlen = dev->needed_tailroom; | |
755 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
756 | if (!skb) { | |
757 | ip_rt_put(rt); | |
758 | return -1; | |
759 | } | |
760 | skb->priority = TC_PRIO_CONTROL; | |
761 | ||
762 | skb_dst_set(skb, &rt->dst); | |
763 | ||
764 | skb_reserve(skb, hlen); | |
765 | ||
766 | skb_reset_network_header(skb); | |
767 | iph = ip_hdr(skb); | |
768 | skb_put(skb, sizeof(struct iphdr) + 4); | |
769 | ||
770 | iph->version = 4; | |
771 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
772 | iph->tos = 0xc0; | |
773 | iph->frag_off = htons(IP_DF); | |
774 | iph->ttl = 1; | |
775 | iph->daddr = dst; | |
776 | iph->saddr = fl4.saddr; | |
777 | iph->protocol = IPPROTO_IGMP; | |
778 | ip_select_ident(net, skb, NULL); | |
779 | ((u8 *)&iph[1])[0] = IPOPT_RA; | |
780 | ((u8 *)&iph[1])[1] = 4; | |
781 | ((u8 *)&iph[1])[2] = 0; | |
782 | ((u8 *)&iph[1])[3] = 0; | |
783 | ||
784 | ih = skb_put(skb, sizeof(struct igmphdr)); | |
785 | ih->type = type; | |
786 | ih->code = 0; | |
787 | ih->csum = 0; | |
788 | ih->group = group; | |
789 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
790 | ||
791 | return ip_local_out(net, skb->sk, skb); | |
792 | } | |
793 | ||
794 | static void igmp_gq_timer_expire(struct timer_list *t) | |
795 | { | |
796 | struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer); | |
797 | ||
798 | in_dev->mr_gq_running = 0; | |
799 | igmpv3_send_report(in_dev, NULL); | |
800 | in_dev_put(in_dev); | |
801 | } | |
802 | ||
803 | static void igmp_ifc_timer_expire(struct timer_list *t) | |
804 | { | |
805 | struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer); | |
806 | ||
807 | igmpv3_send_cr(in_dev); | |
808 | if (in_dev->mr_ifc_count) { | |
809 | in_dev->mr_ifc_count--; | |
810 | igmp_ifc_start_timer(in_dev, | |
811 | unsolicited_report_interval(in_dev)); | |
812 | } | |
813 | in_dev_put(in_dev); | |
814 | } | |
815 | ||
816 | static void igmp_ifc_event(struct in_device *in_dev) | |
817 | { | |
818 | struct net *net = dev_net(in_dev->dev); | |
819 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
820 | return; | |
821 | in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
822 | igmp_ifc_start_timer(in_dev, 1); | |
823 | } | |
824 | ||
825 | ||
826 | static void igmp_timer_expire(struct timer_list *t) | |
827 | { | |
828 | struct ip_mc_list *im = from_timer(im, t, timer); | |
829 | struct in_device *in_dev = im->interface; | |
830 | ||
831 | spin_lock(&im->lock); | |
832 | im->tm_running = 0; | |
833 | ||
834 | if (im->unsolicit_count && --im->unsolicit_count) | |
835 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); | |
836 | ||
837 | im->reporter = 1; | |
838 | spin_unlock(&im->lock); | |
839 | ||
840 | if (IGMP_V1_SEEN(in_dev)) | |
841 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
842 | else if (IGMP_V2_SEEN(in_dev)) | |
843 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
844 | else | |
845 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
846 | ||
847 | ip_ma_put(im); | |
848 | } | |
849 | ||
850 | /* mark EXCLUDE-mode sources */ | |
851 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) | |
852 | { | |
853 | struct ip_sf_list *psf; | |
854 | int i, scount; | |
855 | ||
856 | scount = 0; | |
857 | for (psf = pmc->sources; psf; psf = psf->sf_next) { | |
858 | if (scount == nsrcs) | |
859 | break; | |
860 | for (i = 0; i < nsrcs; i++) { | |
861 | /* skip inactive filters */ | |
862 | if (psf->sf_count[MCAST_INCLUDE] || | |
863 | pmc->sfcount[MCAST_EXCLUDE] != | |
864 | psf->sf_count[MCAST_EXCLUDE]) | |
865 | break; | |
866 | if (srcs[i] == psf->sf_inaddr) { | |
867 | scount++; | |
868 | break; | |
869 | } | |
870 | } | |
871 | } | |
872 | pmc->gsquery = 0; | |
873 | if (scount == nsrcs) /* all sources excluded */ | |
874 | return 0; | |
875 | return 1; | |
876 | } | |
877 | ||
878 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) | |
879 | { | |
880 | struct ip_sf_list *psf; | |
881 | int i, scount; | |
882 | ||
883 | if (pmc->sfmode == MCAST_EXCLUDE) | |
884 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
885 | ||
886 | /* mark INCLUDE-mode sources */ | |
887 | scount = 0; | |
888 | for (psf = pmc->sources; psf; psf = psf->sf_next) { | |
889 | if (scount == nsrcs) | |
890 | break; | |
891 | for (i = 0; i < nsrcs; i++) | |
892 | if (srcs[i] == psf->sf_inaddr) { | |
893 | psf->sf_gsresp = 1; | |
894 | scount++; | |
895 | break; | |
896 | } | |
897 | } | |
898 | if (!scount) { | |
899 | pmc->gsquery = 0; | |
900 | return 0; | |
901 | } | |
902 | pmc->gsquery = 1; | |
903 | return 1; | |
904 | } | |
905 | ||
906 | /* return true if packet was dropped */ | |
907 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
908 | { | |
909 | struct ip_mc_list *im; | |
910 | struct net *net = dev_net(in_dev->dev); | |
911 | ||
912 | /* Timers are only set for non-local groups */ | |
913 | ||
914 | if (group == IGMP_ALL_HOSTS) | |
915 | return false; | |
916 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) | |
917 | return false; | |
918 | ||
919 | rcu_read_lock(); | |
920 | for_each_pmc_rcu(in_dev, im) { | |
921 | if (im->multiaddr == group) { | |
922 | igmp_stop_timer(im); | |
923 | break; | |
924 | } | |
925 | } | |
926 | rcu_read_unlock(); | |
927 | return false; | |
928 | } | |
929 | ||
930 | /* return true if packet was dropped */ | |
931 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
932 | int len) | |
933 | { | |
934 | struct igmphdr *ih = igmp_hdr(skb); | |
935 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
936 | struct ip_mc_list *im; | |
937 | __be32 group = ih->group; | |
938 | int max_delay; | |
939 | int mark = 0; | |
940 | struct net *net = dev_net(in_dev->dev); | |
941 | ||
942 | ||
943 | if (len == 8) { | |
944 | if (ih->code == 0) { | |
945 | /* Alas, old v1 router presents here. */ | |
946 | ||
947 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; | |
948 | in_dev->mr_v1_seen = jiffies + | |
949 | (in_dev->mr_qrv * in_dev->mr_qi) + | |
950 | in_dev->mr_qri; | |
951 | group = 0; | |
952 | } else { | |
953 | /* v2 router present */ | |
954 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
955 | in_dev->mr_v2_seen = jiffies + | |
956 | (in_dev->mr_qrv * in_dev->mr_qi) + | |
957 | in_dev->mr_qri; | |
958 | } | |
959 | /* cancel the interface change timer */ | |
960 | in_dev->mr_ifc_count = 0; | |
961 | if (del_timer(&in_dev->mr_ifc_timer)) | |
962 | __in_dev_put(in_dev); | |
963 | /* clear deleted report items */ | |
964 | igmpv3_clear_delrec(in_dev); | |
965 | } else if (len < 12) { | |
966 | return true; /* ignore bogus packet; freed by caller */ | |
967 | } else if (IGMP_V1_SEEN(in_dev)) { | |
968 | /* This is a v3 query with v1 queriers present */ | |
969 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; | |
970 | group = 0; | |
971 | } else if (IGMP_V2_SEEN(in_dev)) { | |
972 | /* this is a v3 query with v2 queriers present; | |
973 | * Interpretation of the max_delay code is problematic here. | |
974 | * A real v2 host would use ih_code directly, while v3 has a | |
975 | * different encoding. We use the v3 encoding as more likely | |
976 | * to be intended in a v3 query. | |
977 | */ | |
978 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
979 | if (!max_delay) | |
980 | max_delay = 1; /* can't mod w/ 0 */ | |
981 | } else { /* v3 */ | |
982 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
983 | return true; | |
984 | ||
985 | ih3 = igmpv3_query_hdr(skb); | |
986 | if (ih3->nsrcs) { | |
987 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) | |
988 | + ntohs(ih3->nsrcs)*sizeof(__be32))) | |
989 | return true; | |
990 | ih3 = igmpv3_query_hdr(skb); | |
991 | } | |
992 | ||
993 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
994 | if (!max_delay) | |
995 | max_delay = 1; /* can't mod w/ 0 */ | |
996 | in_dev->mr_maxdelay = max_delay; | |
997 | ||
998 | /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently | |
999 | * received value was zero, use the default or statically | |
1000 | * configured value. | |
1001 | */ | |
1002 | in_dev->mr_qrv = ih3->qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1003 | in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL; | |
1004 | ||
1005 | /* RFC3376, 8.3. Query Response Interval: | |
1006 | * The number of seconds represented by the [Query Response | |
1007 | * Interval] must be less than the [Query Interval]. | |
1008 | */ | |
1009 | if (in_dev->mr_qri >= in_dev->mr_qi) | |
1010 | in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ; | |
1011 | ||
1012 | if (!group) { /* general query */ | |
1013 | if (ih3->nsrcs) | |
1014 | return true; /* no sources allowed */ | |
1015 | igmp_gq_start_timer(in_dev); | |
1016 | return false; | |
1017 | } | |
1018 | /* mark sources to include, if group & source-specific */ | |
1019 | mark = ih3->nsrcs != 0; | |
1020 | } | |
1021 | ||
1022 | /* | |
1023 | * - Start the timers in all of our membership records | |
1024 | * that the query applies to for the interface on | |
1025 | * which the query arrived excl. those that belong | |
1026 | * to a "local" group (224.0.0.X) | |
1027 | * - For timers already running check if they need to | |
1028 | * be reset. | |
1029 | * - Use the igmp->igmp_code field as the maximum | |
1030 | * delay possible | |
1031 | */ | |
1032 | rcu_read_lock(); | |
1033 | for_each_pmc_rcu(in_dev, im) { | |
1034 | int changed; | |
1035 | ||
1036 | if (group && group != im->multiaddr) | |
1037 | continue; | |
1038 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1039 | continue; | |
1040 | if (ipv4_is_local_multicast(im->multiaddr) && | |
1041 | !net->ipv4.sysctl_igmp_llm_reports) | |
1042 | continue; | |
1043 | spin_lock_bh(&im->lock); | |
1044 | if (im->tm_running) | |
1045 | im->gsquery = im->gsquery && mark; | |
1046 | else | |
1047 | im->gsquery = mark; | |
1048 | changed = !im->gsquery || | |
1049 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); | |
1050 | spin_unlock_bh(&im->lock); | |
1051 | if (changed) | |
1052 | igmp_mod_timer(im, max_delay); | |
1053 | } | |
1054 | rcu_read_unlock(); | |
1055 | return false; | |
1056 | } | |
1057 | ||
1058 | /* called in rcu_read_lock() section */ | |
1059 | int igmp_rcv(struct sk_buff *skb) | |
1060 | { | |
1061 | /* This basically follows the spec line by line -- see RFC1112 */ | |
1062 | struct igmphdr *ih; | |
1063 | struct net_device *dev = skb->dev; | |
1064 | struct in_device *in_dev; | |
1065 | int len = skb->len; | |
1066 | bool dropped = true; | |
1067 | ||
1068 | if (netif_is_l3_master(dev)) { | |
1069 | dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif); | |
1070 | if (!dev) | |
1071 | goto drop; | |
1072 | } | |
1073 | ||
1074 | in_dev = __in_dev_get_rcu(dev); | |
1075 | if (!in_dev) | |
1076 | goto drop; | |
1077 | ||
1078 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) | |
1079 | goto drop; | |
1080 | ||
1081 | if (skb_checksum_simple_validate(skb)) | |
1082 | goto drop; | |
1083 | ||
1084 | ih = igmp_hdr(skb); | |
1085 | switch (ih->type) { | |
1086 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1087 | dropped = igmp_heard_query(in_dev, skb, len); | |
1088 | break; | |
1089 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1090 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1091 | /* Is it our report looped back? */ | |
1092 | if (rt_is_output_route(skb_rtable(skb))) | |
1093 | break; | |
1094 | /* don't rely on MC router hearing unicast reports */ | |
1095 | if (skb->pkt_type == PACKET_MULTICAST || | |
1096 | skb->pkt_type == PACKET_BROADCAST) | |
1097 | dropped = igmp_heard_report(in_dev, ih->group); | |
1098 | break; | |
1099 | case IGMP_PIM: | |
1100 | #ifdef CONFIG_IP_PIMSM_V1 | |
1101 | return pim_rcv_v1(skb); | |
1102 | #endif | |
1103 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1104 | case IGMP_DVMRP: | |
1105 | case IGMP_TRACE: | |
1106 | case IGMP_HOST_LEAVE_MESSAGE: | |
1107 | case IGMP_MTRACE: | |
1108 | case IGMP_MTRACE_RESP: | |
1109 | break; | |
1110 | default: | |
1111 | break; | |
1112 | } | |
1113 | ||
1114 | drop: | |
1115 | if (dropped) | |
1116 | kfree_skb(skb); | |
1117 | else | |
1118 | consume_skb(skb); | |
1119 | return 0; | |
1120 | } | |
1121 | ||
1122 | #endif | |
1123 | ||
1124 | ||
1125 | /* | |
1126 | * Add a filter to a device | |
1127 | */ | |
1128 | ||
1129 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) | |
1130 | { | |
1131 | char buf[MAX_ADDR_LEN]; | |
1132 | struct net_device *dev = in_dev->dev; | |
1133 | ||
1134 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1135 | We will get multicast token leakage, when IFF_MULTICAST | |
1136 | is changed. This check should be done in ndo_set_rx_mode | |
1137 | routine. Something sort of: | |
1138 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1139 | --ANK | |
1140 | */ | |
1141 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
1142 | dev_mc_add(dev, buf); | |
1143 | } | |
1144 | ||
1145 | /* | |
1146 | * Remove a filter from a device | |
1147 | */ | |
1148 | ||
1149 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) | |
1150 | { | |
1151 | char buf[MAX_ADDR_LEN]; | |
1152 | struct net_device *dev = in_dev->dev; | |
1153 | ||
1154 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
1155 | dev_mc_del(dev, buf); | |
1156 | } | |
1157 | ||
1158 | #ifdef CONFIG_IP_MULTICAST | |
1159 | /* | |
1160 | * deleted ip_mc_list manipulation | |
1161 | */ | |
1162 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, | |
1163 | gfp_t gfp) | |
1164 | { | |
1165 | struct ip_mc_list *pmc; | |
1166 | struct net *net = dev_net(in_dev->dev); | |
1167 | ||
1168 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1169 | * are actually used. In particular, the refcnt and users are not | |
1170 | * used for management of the delete list. Using the same structure | |
1171 | * for deleted items allows change reports to use common code with | |
1172 | * non-deleted or query-response MCA's. | |
1173 | */ | |
1174 | pmc = kzalloc(sizeof(*pmc), gfp); | |
1175 | if (!pmc) | |
1176 | return; | |
1177 | spin_lock_init(&pmc->lock); | |
1178 | spin_lock_bh(&im->lock); | |
1179 | pmc->interface = im->interface; | |
1180 | in_dev_hold(in_dev); | |
1181 | pmc->multiaddr = im->multiaddr; | |
1182 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1183 | pmc->sfmode = im->sfmode; | |
1184 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1185 | struct ip_sf_list *psf; | |
1186 | ||
1187 | pmc->tomb = im->tomb; | |
1188 | pmc->sources = im->sources; | |
1189 | im->tomb = im->sources = NULL; | |
1190 | for (psf = pmc->sources; psf; psf = psf->sf_next) | |
1191 | psf->sf_crcount = pmc->crcount; | |
1192 | } | |
1193 | spin_unlock_bh(&im->lock); | |
1194 | ||
1195 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1196 | pmc->next = in_dev->mc_tomb; | |
1197 | in_dev->mc_tomb = pmc; | |
1198 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * restore ip_mc_list deleted records | |
1203 | */ | |
1204 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1205 | { | |
1206 | struct ip_mc_list *pmc, *pmc_prev; | |
1207 | struct ip_sf_list *psf; | |
1208 | struct net *net = dev_net(in_dev->dev); | |
1209 | __be32 multiaddr = im->multiaddr; | |
1210 | ||
1211 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1212 | pmc_prev = NULL; | |
1213 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { | |
1214 | if (pmc->multiaddr == multiaddr) | |
1215 | break; | |
1216 | pmc_prev = pmc; | |
1217 | } | |
1218 | if (pmc) { | |
1219 | if (pmc_prev) | |
1220 | pmc_prev->next = pmc->next; | |
1221 | else | |
1222 | in_dev->mc_tomb = pmc->next; | |
1223 | } | |
1224 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1225 | ||
1226 | spin_lock_bh(&im->lock); | |
1227 | if (pmc) { | |
1228 | im->interface = pmc->interface; | |
1229 | if (im->sfmode == MCAST_INCLUDE) { | |
1230 | swap(im->tomb, pmc->tomb); | |
1231 | swap(im->sources, pmc->sources); | |
1232 | for (psf = im->sources; psf; psf = psf->sf_next) | |
1233 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1234 | } else { | |
1235 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1236 | } | |
1237 | in_dev_put(pmc->interface); | |
1238 | kfree_pmc(pmc); | |
1239 | } | |
1240 | spin_unlock_bh(&im->lock); | |
1241 | } | |
1242 | ||
1243 | /* | |
1244 | * flush ip_mc_list deleted records | |
1245 | */ | |
1246 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1247 | { | |
1248 | struct ip_mc_list *pmc, *nextpmc; | |
1249 | ||
1250 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1251 | pmc = in_dev->mc_tomb; | |
1252 | in_dev->mc_tomb = NULL; | |
1253 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1254 | ||
1255 | for (; pmc; pmc = nextpmc) { | |
1256 | nextpmc = pmc->next; | |
1257 | ip_mc_clear_src(pmc); | |
1258 | in_dev_put(pmc->interface); | |
1259 | kfree_pmc(pmc); | |
1260 | } | |
1261 | /* clear dead sources, too */ | |
1262 | rcu_read_lock(); | |
1263 | for_each_pmc_rcu(in_dev, pmc) { | |
1264 | struct ip_sf_list *psf; | |
1265 | ||
1266 | spin_lock_bh(&pmc->lock); | |
1267 | psf = pmc->tomb; | |
1268 | pmc->tomb = NULL; | |
1269 | spin_unlock_bh(&pmc->lock); | |
1270 | ip_sf_list_clear_all(psf); | |
1271 | } | |
1272 | rcu_read_unlock(); | |
1273 | } | |
1274 | #endif | |
1275 | ||
1276 | static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp) | |
1277 | { | |
1278 | struct in_device *in_dev = im->interface; | |
1279 | #ifdef CONFIG_IP_MULTICAST | |
1280 | struct net *net = dev_net(in_dev->dev); | |
1281 | int reporter; | |
1282 | #endif | |
1283 | ||
1284 | if (im->loaded) { | |
1285 | im->loaded = 0; | |
1286 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1287 | } | |
1288 | ||
1289 | #ifdef CONFIG_IP_MULTICAST | |
1290 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1291 | return; | |
1292 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) | |
1293 | return; | |
1294 | ||
1295 | reporter = im->reporter; | |
1296 | igmp_stop_timer(im); | |
1297 | ||
1298 | if (!in_dev->dead) { | |
1299 | if (IGMP_V1_SEEN(in_dev)) | |
1300 | return; | |
1301 | if (IGMP_V2_SEEN(in_dev)) { | |
1302 | if (reporter) | |
1303 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
1304 | return; | |
1305 | } | |
1306 | /* IGMPv3 */ | |
1307 | igmpv3_add_delrec(in_dev, im, gfp); | |
1308 | ||
1309 | igmp_ifc_event(in_dev); | |
1310 | } | |
1311 | #endif | |
1312 | } | |
1313 | ||
1314 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1315 | { | |
1316 | __igmp_group_dropped(im, GFP_KERNEL); | |
1317 | } | |
1318 | ||
1319 | static void igmp_group_added(struct ip_mc_list *im) | |
1320 | { | |
1321 | struct in_device *in_dev = im->interface; | |
1322 | #ifdef CONFIG_IP_MULTICAST | |
1323 | struct net *net = dev_net(in_dev->dev); | |
1324 | #endif | |
1325 | ||
1326 | if (im->loaded == 0) { | |
1327 | im->loaded = 1; | |
1328 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1329 | } | |
1330 | ||
1331 | #ifdef CONFIG_IP_MULTICAST | |
1332 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1333 | return; | |
1334 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) | |
1335 | return; | |
1336 | ||
1337 | if (in_dev->dead) | |
1338 | return; | |
1339 | ||
1340 | im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; | |
1341 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1342 | spin_lock_bh(&im->lock); | |
1343 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); | |
1344 | spin_unlock_bh(&im->lock); | |
1345 | return; | |
1346 | } | |
1347 | /* else, v3 */ | |
1348 | ||
1349 | /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should | |
1350 | * not send filter-mode change record as the mode should be from | |
1351 | * IN() to IN(A). | |
1352 | */ | |
1353 | if (im->sfmode == MCAST_EXCLUDE) | |
1354 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1355 | ||
1356 | igmp_ifc_event(in_dev); | |
1357 | #endif | |
1358 | } | |
1359 | ||
1360 | ||
1361 | /* | |
1362 | * Multicast list managers | |
1363 | */ | |
1364 | ||
1365 | static u32 ip_mc_hash(const struct ip_mc_list *im) | |
1366 | { | |
1367 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); | |
1368 | } | |
1369 | ||
1370 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1371 | struct ip_mc_list *im) | |
1372 | { | |
1373 | struct ip_mc_list __rcu **mc_hash; | |
1374 | u32 hash; | |
1375 | ||
1376 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1377 | if (mc_hash) { | |
1378 | hash = ip_mc_hash(im); | |
1379 | im->next_hash = mc_hash[hash]; | |
1380 | rcu_assign_pointer(mc_hash[hash], im); | |
1381 | return; | |
1382 | } | |
1383 | ||
1384 | /* do not use a hash table for small number of items */ | |
1385 | if (in_dev->mc_count < 4) | |
1386 | return; | |
1387 | ||
1388 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1389 | GFP_KERNEL); | |
1390 | if (!mc_hash) | |
1391 | return; | |
1392 | ||
1393 | for_each_pmc_rtnl(in_dev, im) { | |
1394 | hash = ip_mc_hash(im); | |
1395 | im->next_hash = mc_hash[hash]; | |
1396 | RCU_INIT_POINTER(mc_hash[hash], im); | |
1397 | } | |
1398 | ||
1399 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1400 | } | |
1401 | ||
1402 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1403 | struct ip_mc_list *im) | |
1404 | { | |
1405 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1406 | struct ip_mc_list *aux; | |
1407 | ||
1408 | if (!mc_hash) | |
1409 | return; | |
1410 | mc_hash += ip_mc_hash(im); | |
1411 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1412 | mc_hash = &aux->next_hash; | |
1413 | *mc_hash = im->next_hash; | |
1414 | } | |
1415 | ||
1416 | ||
1417 | /* | |
1418 | * A socket has joined a multicast group on device dev. | |
1419 | */ | |
1420 | static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr, | |
1421 | unsigned int mode, gfp_t gfp) | |
1422 | { | |
1423 | struct ip_mc_list *im; | |
1424 | ||
1425 | ASSERT_RTNL(); | |
1426 | ||
1427 | for_each_pmc_rtnl(in_dev, im) { | |
1428 | if (im->multiaddr == addr) { | |
1429 | im->users++; | |
1430 | ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0); | |
1431 | goto out; | |
1432 | } | |
1433 | } | |
1434 | ||
1435 | im = kzalloc(sizeof(*im), gfp); | |
1436 | if (!im) | |
1437 | goto out; | |
1438 | ||
1439 | im->users = 1; | |
1440 | im->interface = in_dev; | |
1441 | in_dev_hold(in_dev); | |
1442 | im->multiaddr = addr; | |
1443 | /* initial mode is (EX, empty) */ | |
1444 | im->sfmode = mode; | |
1445 | im->sfcount[mode] = 1; | |
1446 | refcount_set(&im->refcnt, 1); | |
1447 | spin_lock_init(&im->lock); | |
1448 | #ifdef CONFIG_IP_MULTICAST | |
1449 | timer_setup(&im->timer, igmp_timer_expire, 0); | |
1450 | #endif | |
1451 | ||
1452 | im->next_rcu = in_dev->mc_list; | |
1453 | in_dev->mc_count++; | |
1454 | rcu_assign_pointer(in_dev->mc_list, im); | |
1455 | ||
1456 | ip_mc_hash_add(in_dev, im); | |
1457 | ||
1458 | #ifdef CONFIG_IP_MULTICAST | |
1459 | igmpv3_del_delrec(in_dev, im); | |
1460 | #endif | |
1461 | igmp_group_added(im); | |
1462 | if (!in_dev->dead) | |
1463 | ip_rt_multicast_event(in_dev); | |
1464 | out: | |
1465 | return; | |
1466 | } | |
1467 | ||
1468 | void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) | |
1469 | { | |
1470 | ____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp); | |
1471 | } | |
1472 | EXPORT_SYMBOL(__ip_mc_inc_group); | |
1473 | ||
1474 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) | |
1475 | { | |
1476 | __ip_mc_inc_group(in_dev, addr, GFP_KERNEL); | |
1477 | } | |
1478 | EXPORT_SYMBOL(ip_mc_inc_group); | |
1479 | ||
1480 | static int ip_mc_check_iphdr(struct sk_buff *skb) | |
1481 | { | |
1482 | const struct iphdr *iph; | |
1483 | unsigned int len; | |
1484 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1485 | ||
1486 | if (!pskb_may_pull(skb, offset)) | |
1487 | return -EINVAL; | |
1488 | ||
1489 | iph = ip_hdr(skb); | |
1490 | ||
1491 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1492 | return -EINVAL; | |
1493 | ||
1494 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1495 | ||
1496 | if (!pskb_may_pull(skb, offset)) | |
1497 | return -EINVAL; | |
1498 | ||
1499 | iph = ip_hdr(skb); | |
1500 | ||
1501 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1502 | return -EINVAL; | |
1503 | ||
1504 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1505 | if (skb->len < len || len < offset) | |
1506 | return -EINVAL; | |
1507 | ||
1508 | skb_set_transport_header(skb, offset); | |
1509 | ||
1510 | return 0; | |
1511 | } | |
1512 | ||
1513 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1514 | { | |
1515 | unsigned int len = skb_transport_offset(skb); | |
1516 | ||
1517 | len += sizeof(struct igmpv3_report); | |
1518 | ||
1519 | return ip_mc_may_pull(skb, len) ? 0 : -EINVAL; | |
1520 | } | |
1521 | ||
1522 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1523 | { | |
1524 | unsigned int transport_len = ip_transport_len(skb); | |
1525 | unsigned int len; | |
1526 | ||
1527 | /* IGMPv{1,2}? */ | |
1528 | if (transport_len != sizeof(struct igmphdr)) { | |
1529 | /* or IGMPv3? */ | |
1530 | if (transport_len < sizeof(struct igmpv3_query)) | |
1531 | return -EINVAL; | |
1532 | ||
1533 | len = skb_transport_offset(skb) + sizeof(struct igmpv3_query); | |
1534 | if (!ip_mc_may_pull(skb, len)) | |
1535 | return -EINVAL; | |
1536 | } | |
1537 | ||
1538 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1539 | * all-systems destination addresses (224.0.0.1) for general queries | |
1540 | */ | |
1541 | if (!igmp_hdr(skb)->group && | |
1542 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1543 | return -EINVAL; | |
1544 | ||
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1549 | { | |
1550 | switch (igmp_hdr(skb)->type) { | |
1551 | case IGMP_HOST_LEAVE_MESSAGE: | |
1552 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1553 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1554 | return 0; | |
1555 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1556 | return ip_mc_check_igmp_reportv3(skb); | |
1557 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1558 | return ip_mc_check_igmp_query(skb); | |
1559 | default: | |
1560 | return -ENOMSG; | |
1561 | } | |
1562 | } | |
1563 | ||
1564 | static __sum16 ip_mc_validate_checksum(struct sk_buff *skb) | |
1565 | { | |
1566 | return skb_checksum_simple_validate(skb); | |
1567 | } | |
1568 | ||
1569 | static int ip_mc_check_igmp_csum(struct sk_buff *skb) | |
1570 | { | |
1571 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); | |
1572 | unsigned int transport_len = ip_transport_len(skb); | |
1573 | struct sk_buff *skb_chk; | |
1574 | ||
1575 | if (!ip_mc_may_pull(skb, len)) | |
1576 | return -EINVAL; | |
1577 | ||
1578 | skb_chk = skb_checksum_trimmed(skb, transport_len, | |
1579 | ip_mc_validate_checksum); | |
1580 | if (!skb_chk) | |
1581 | return -EINVAL; | |
1582 | ||
1583 | if (skb_chk != skb) | |
1584 | kfree_skb(skb_chk); | |
1585 | ||
1586 | return 0; | |
1587 | } | |
1588 | ||
1589 | /** | |
1590 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1591 | * @skb: the skb to validate | |
1592 | * | |
1593 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
1594 | * skb transport header accordingly and returns zero. | |
1595 | * | |
1596 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1597 | * standard | |
1598 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1599 | * -ENOMEM: A memory allocation failure happened. | |
1600 | * | |
1601 | * Caller needs to set the skb network header and free any returned skb if it | |
1602 | * differs from the provided skb. | |
1603 | */ | |
1604 | int ip_mc_check_igmp(struct sk_buff *skb) | |
1605 | { | |
1606 | int ret = ip_mc_check_iphdr(skb); | |
1607 | ||
1608 | if (ret < 0) | |
1609 | return ret; | |
1610 | ||
1611 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1612 | return -ENOMSG; | |
1613 | ||
1614 | ret = ip_mc_check_igmp_csum(skb); | |
1615 | if (ret < 0) | |
1616 | return ret; | |
1617 | ||
1618 | return ip_mc_check_igmp_msg(skb); | |
1619 | } | |
1620 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1621 | ||
1622 | /* | |
1623 | * Resend IGMP JOIN report; used by netdev notifier. | |
1624 | */ | |
1625 | static void ip_mc_rejoin_groups(struct in_device *in_dev) | |
1626 | { | |
1627 | #ifdef CONFIG_IP_MULTICAST | |
1628 | struct ip_mc_list *im; | |
1629 | int type; | |
1630 | struct net *net = dev_net(in_dev->dev); | |
1631 | ||
1632 | ASSERT_RTNL(); | |
1633 | ||
1634 | for_each_pmc_rtnl(in_dev, im) { | |
1635 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1636 | continue; | |
1637 | if (ipv4_is_local_multicast(im->multiaddr) && | |
1638 | !net->ipv4.sysctl_igmp_llm_reports) | |
1639 | continue; | |
1640 | ||
1641 | /* a failover is happening and switches | |
1642 | * must be notified immediately | |
1643 | */ | |
1644 | if (IGMP_V1_SEEN(in_dev)) | |
1645 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1646 | else if (IGMP_V2_SEEN(in_dev)) | |
1647 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1648 | else | |
1649 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1650 | igmp_send_report(in_dev, im, type); | |
1651 | } | |
1652 | #endif | |
1653 | } | |
1654 | ||
1655 | /* | |
1656 | * A socket has left a multicast group on device dev | |
1657 | */ | |
1658 | ||
1659 | void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) | |
1660 | { | |
1661 | struct ip_mc_list *i; | |
1662 | struct ip_mc_list __rcu **ip; | |
1663 | ||
1664 | ASSERT_RTNL(); | |
1665 | ||
1666 | for (ip = &in_dev->mc_list; | |
1667 | (i = rtnl_dereference(*ip)) != NULL; | |
1668 | ip = &i->next_rcu) { | |
1669 | if (i->multiaddr == addr) { | |
1670 | if (--i->users == 0) { | |
1671 | ip_mc_hash_remove(in_dev, i); | |
1672 | *ip = i->next_rcu; | |
1673 | in_dev->mc_count--; | |
1674 | __igmp_group_dropped(i, gfp); | |
1675 | ip_mc_clear_src(i); | |
1676 | ||
1677 | if (!in_dev->dead) | |
1678 | ip_rt_multicast_event(in_dev); | |
1679 | ||
1680 | ip_ma_put(i); | |
1681 | return; | |
1682 | } | |
1683 | break; | |
1684 | } | |
1685 | } | |
1686 | } | |
1687 | EXPORT_SYMBOL(__ip_mc_dec_group); | |
1688 | ||
1689 | /* Device changing type */ | |
1690 | ||
1691 | void ip_mc_unmap(struct in_device *in_dev) | |
1692 | { | |
1693 | struct ip_mc_list *pmc; | |
1694 | ||
1695 | ASSERT_RTNL(); | |
1696 | ||
1697 | for_each_pmc_rtnl(in_dev, pmc) | |
1698 | igmp_group_dropped(pmc); | |
1699 | } | |
1700 | ||
1701 | void ip_mc_remap(struct in_device *in_dev) | |
1702 | { | |
1703 | struct ip_mc_list *pmc; | |
1704 | ||
1705 | ASSERT_RTNL(); | |
1706 | ||
1707 | for_each_pmc_rtnl(in_dev, pmc) { | |
1708 | #ifdef CONFIG_IP_MULTICAST | |
1709 | igmpv3_del_delrec(in_dev, pmc); | |
1710 | #endif | |
1711 | igmp_group_added(pmc); | |
1712 | } | |
1713 | } | |
1714 | ||
1715 | /* Device going down */ | |
1716 | ||
1717 | void ip_mc_down(struct in_device *in_dev) | |
1718 | { | |
1719 | struct ip_mc_list *pmc; | |
1720 | ||
1721 | ASSERT_RTNL(); | |
1722 | ||
1723 | for_each_pmc_rtnl(in_dev, pmc) | |
1724 | igmp_group_dropped(pmc); | |
1725 | ||
1726 | #ifdef CONFIG_IP_MULTICAST | |
1727 | in_dev->mr_ifc_count = 0; | |
1728 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1729 | __in_dev_put(in_dev); | |
1730 | in_dev->mr_gq_running = 0; | |
1731 | if (del_timer(&in_dev->mr_gq_timer)) | |
1732 | __in_dev_put(in_dev); | |
1733 | #endif | |
1734 | ||
1735 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1736 | } | |
1737 | ||
1738 | #ifdef CONFIG_IP_MULTICAST | |
1739 | static void ip_mc_reset(struct in_device *in_dev) | |
1740 | { | |
1741 | struct net *net = dev_net(in_dev->dev); | |
1742 | ||
1743 | in_dev->mr_qi = IGMP_QUERY_INTERVAL; | |
1744 | in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL; | |
1745 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; | |
1746 | } | |
1747 | #else | |
1748 | static void ip_mc_reset(struct in_device *in_dev) | |
1749 | { | |
1750 | } | |
1751 | #endif | |
1752 | ||
1753 | void ip_mc_init_dev(struct in_device *in_dev) | |
1754 | { | |
1755 | ASSERT_RTNL(); | |
1756 | ||
1757 | #ifdef CONFIG_IP_MULTICAST | |
1758 | timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0); | |
1759 | timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0); | |
1760 | #endif | |
1761 | ip_mc_reset(in_dev); | |
1762 | ||
1763 | spin_lock_init(&in_dev->mc_tomb_lock); | |
1764 | } | |
1765 | ||
1766 | /* Device going up */ | |
1767 | ||
1768 | void ip_mc_up(struct in_device *in_dev) | |
1769 | { | |
1770 | struct ip_mc_list *pmc; | |
1771 | ||
1772 | ASSERT_RTNL(); | |
1773 | ||
1774 | ip_mc_reset(in_dev); | |
1775 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1776 | ||
1777 | for_each_pmc_rtnl(in_dev, pmc) { | |
1778 | #ifdef CONFIG_IP_MULTICAST | |
1779 | igmpv3_del_delrec(in_dev, pmc); | |
1780 | #endif | |
1781 | igmp_group_added(pmc); | |
1782 | } | |
1783 | } | |
1784 | ||
1785 | /* | |
1786 | * Device is about to be destroyed: clean up. | |
1787 | */ | |
1788 | ||
1789 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1790 | { | |
1791 | struct ip_mc_list *i; | |
1792 | ||
1793 | ASSERT_RTNL(); | |
1794 | ||
1795 | /* Deactivate timers */ | |
1796 | ip_mc_down(in_dev); | |
1797 | #ifdef CONFIG_IP_MULTICAST | |
1798 | igmpv3_clear_delrec(in_dev); | |
1799 | #endif | |
1800 | ||
1801 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { | |
1802 | in_dev->mc_list = i->next_rcu; | |
1803 | in_dev->mc_count--; | |
1804 | ip_ma_put(i); | |
1805 | } | |
1806 | } | |
1807 | ||
1808 | /* RTNL is locked */ | |
1809 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) | |
1810 | { | |
1811 | struct net_device *dev = NULL; | |
1812 | struct in_device *idev = NULL; | |
1813 | ||
1814 | if (imr->imr_ifindex) { | |
1815 | idev = inetdev_by_index(net, imr->imr_ifindex); | |
1816 | return idev; | |
1817 | } | |
1818 | if (imr->imr_address.s_addr) { | |
1819 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); | |
1820 | if (!dev) | |
1821 | return NULL; | |
1822 | } | |
1823 | ||
1824 | if (!dev) { | |
1825 | struct rtable *rt = ip_route_output(net, | |
1826 | imr->imr_multiaddr.s_addr, | |
1827 | 0, 0, 0); | |
1828 | if (!IS_ERR(rt)) { | |
1829 | dev = rt->dst.dev; | |
1830 | ip_rt_put(rt); | |
1831 | } | |
1832 | } | |
1833 | if (dev) { | |
1834 | imr->imr_ifindex = dev->ifindex; | |
1835 | idev = __in_dev_get_rtnl(dev); | |
1836 | } | |
1837 | return idev; | |
1838 | } | |
1839 | ||
1840 | /* | |
1841 | * Join a socket to a group | |
1842 | */ | |
1843 | ||
1844 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
1845 | __be32 *psfsrc) | |
1846 | { | |
1847 | struct ip_sf_list *psf, *psf_prev; | |
1848 | int rv = 0; | |
1849 | ||
1850 | psf_prev = NULL; | |
1851 | for (psf = pmc->sources; psf; psf = psf->sf_next) { | |
1852 | if (psf->sf_inaddr == *psfsrc) | |
1853 | break; | |
1854 | psf_prev = psf; | |
1855 | } | |
1856 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1857 | /* source filter not found, or count wrong => bug */ | |
1858 | return -ESRCH; | |
1859 | } | |
1860 | psf->sf_count[sfmode]--; | |
1861 | if (psf->sf_count[sfmode] == 0) { | |
1862 | ip_rt_multicast_event(pmc->interface); | |
1863 | } | |
1864 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1865 | #ifdef CONFIG_IP_MULTICAST | |
1866 | struct in_device *in_dev = pmc->interface; | |
1867 | struct net *net = dev_net(in_dev->dev); | |
1868 | #endif | |
1869 | ||
1870 | /* no more filters for this source */ | |
1871 | if (psf_prev) | |
1872 | psf_prev->sf_next = psf->sf_next; | |
1873 | else | |
1874 | pmc->sources = psf->sf_next; | |
1875 | #ifdef CONFIG_IP_MULTICAST | |
1876 | if (psf->sf_oldin && | |
1877 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
1878 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1879 | psf->sf_next = pmc->tomb; | |
1880 | pmc->tomb = psf; | |
1881 | rv = 1; | |
1882 | } else | |
1883 | #endif | |
1884 | kfree(psf); | |
1885 | } | |
1886 | return rv; | |
1887 | } | |
1888 | ||
1889 | #ifndef CONFIG_IP_MULTICAST | |
1890 | #define igmp_ifc_event(x) do { } while (0) | |
1891 | #endif | |
1892 | ||
1893 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, | |
1894 | int sfcount, __be32 *psfsrc, int delta) | |
1895 | { | |
1896 | struct ip_mc_list *pmc; | |
1897 | int changerec = 0; | |
1898 | int i, err; | |
1899 | ||
1900 | if (!in_dev) | |
1901 | return -ENODEV; | |
1902 | rcu_read_lock(); | |
1903 | for_each_pmc_rcu(in_dev, pmc) { | |
1904 | if (*pmca == pmc->multiaddr) | |
1905 | break; | |
1906 | } | |
1907 | if (!pmc) { | |
1908 | /* MCA not found?? bug */ | |
1909 | rcu_read_unlock(); | |
1910 | return -ESRCH; | |
1911 | } | |
1912 | spin_lock_bh(&pmc->lock); | |
1913 | rcu_read_unlock(); | |
1914 | #ifdef CONFIG_IP_MULTICAST | |
1915 | sf_markstate(pmc); | |
1916 | #endif | |
1917 | if (!delta) { | |
1918 | err = -EINVAL; | |
1919 | if (!pmc->sfcount[sfmode]) | |
1920 | goto out_unlock; | |
1921 | pmc->sfcount[sfmode]--; | |
1922 | } | |
1923 | err = 0; | |
1924 | for (i = 0; i < sfcount; i++) { | |
1925 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1926 | ||
1927 | changerec |= rv > 0; | |
1928 | if (!err && rv < 0) | |
1929 | err = rv; | |
1930 | } | |
1931 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1932 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1933 | pmc->sfcount[MCAST_INCLUDE]) { | |
1934 | #ifdef CONFIG_IP_MULTICAST | |
1935 | struct ip_sf_list *psf; | |
1936 | struct net *net = dev_net(in_dev->dev); | |
1937 | #endif | |
1938 | ||
1939 | /* filter mode change */ | |
1940 | pmc->sfmode = MCAST_INCLUDE; | |
1941 | #ifdef CONFIG_IP_MULTICAST | |
1942 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1943 | in_dev->mr_ifc_count = pmc->crcount; | |
1944 | for (psf = pmc->sources; psf; psf = psf->sf_next) | |
1945 | psf->sf_crcount = 0; | |
1946 | igmp_ifc_event(pmc->interface); | |
1947 | } else if (sf_setstate(pmc) || changerec) { | |
1948 | igmp_ifc_event(pmc->interface); | |
1949 | #endif | |
1950 | } | |
1951 | out_unlock: | |
1952 | spin_unlock_bh(&pmc->lock); | |
1953 | return err; | |
1954 | } | |
1955 | ||
1956 | /* | |
1957 | * Add multicast single-source filter to the interface list | |
1958 | */ | |
1959 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
1960 | __be32 *psfsrc) | |
1961 | { | |
1962 | struct ip_sf_list *psf, *psf_prev; | |
1963 | ||
1964 | psf_prev = NULL; | |
1965 | for (psf = pmc->sources; psf; psf = psf->sf_next) { | |
1966 | if (psf->sf_inaddr == *psfsrc) | |
1967 | break; | |
1968 | psf_prev = psf; | |
1969 | } | |
1970 | if (!psf) { | |
1971 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); | |
1972 | if (!psf) | |
1973 | return -ENOBUFS; | |
1974 | psf->sf_inaddr = *psfsrc; | |
1975 | if (psf_prev) { | |
1976 | psf_prev->sf_next = psf; | |
1977 | } else | |
1978 | pmc->sources = psf; | |
1979 | } | |
1980 | psf->sf_count[sfmode]++; | |
1981 | if (psf->sf_count[sfmode] == 1) { | |
1982 | ip_rt_multicast_event(pmc->interface); | |
1983 | } | |
1984 | return 0; | |
1985 | } | |
1986 | ||
1987 | #ifdef CONFIG_IP_MULTICAST | |
1988 | static void sf_markstate(struct ip_mc_list *pmc) | |
1989 | { | |
1990 | struct ip_sf_list *psf; | |
1991 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1992 | ||
1993 | for (psf = pmc->sources; psf; psf = psf->sf_next) | |
1994 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1995 | psf->sf_oldin = mca_xcount == | |
1996 | psf->sf_count[MCAST_EXCLUDE] && | |
1997 | !psf->sf_count[MCAST_INCLUDE]; | |
1998 | } else | |
1999 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
2000 | } | |
2001 | ||
2002 | static int sf_setstate(struct ip_mc_list *pmc) | |
2003 | { | |
2004 | struct ip_sf_list *psf, *dpsf; | |
2005 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
2006 | int qrv = pmc->interface->mr_qrv; | |
2007 | int new_in, rv; | |
2008 | ||
2009 | rv = 0; | |
2010 | for (psf = pmc->sources; psf; psf = psf->sf_next) { | |
2011 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
2012 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
2013 | !psf->sf_count[MCAST_INCLUDE]; | |
2014 | } else | |
2015 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
2016 | if (new_in) { | |
2017 | if (!psf->sf_oldin) { | |
2018 | struct ip_sf_list *prev = NULL; | |
2019 | ||
2020 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { | |
2021 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
2022 | break; | |
2023 | prev = dpsf; | |
2024 | } | |
2025 | if (dpsf) { | |
2026 | if (prev) | |
2027 | prev->sf_next = dpsf->sf_next; | |
2028 | else | |
2029 | pmc->tomb = dpsf->sf_next; | |
2030 | kfree(dpsf); | |
2031 | } | |
2032 | psf->sf_crcount = qrv; | |
2033 | rv++; | |
2034 | } | |
2035 | } else if (psf->sf_oldin) { | |
2036 | ||
2037 | psf->sf_crcount = 0; | |
2038 | /* | |
2039 | * add or update "delete" records if an active filter | |
2040 | * is now inactive | |
2041 | */ | |
2042 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) | |
2043 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
2044 | break; | |
2045 | if (!dpsf) { | |
2046 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); | |
2047 | if (!dpsf) | |
2048 | continue; | |
2049 | *dpsf = *psf; | |
2050 | /* pmc->lock held by callers */ | |
2051 | dpsf->sf_next = pmc->tomb; | |
2052 | pmc->tomb = dpsf; | |
2053 | } | |
2054 | dpsf->sf_crcount = qrv; | |
2055 | rv++; | |
2056 | } | |
2057 | } | |
2058 | return rv; | |
2059 | } | |
2060 | #endif | |
2061 | ||
2062 | /* | |
2063 | * Add multicast source filter list to the interface list | |
2064 | */ | |
2065 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, | |
2066 | int sfcount, __be32 *psfsrc, int delta) | |
2067 | { | |
2068 | struct ip_mc_list *pmc; | |
2069 | int isexclude; | |
2070 | int i, err; | |
2071 | ||
2072 | if (!in_dev) | |
2073 | return -ENODEV; | |
2074 | rcu_read_lock(); | |
2075 | for_each_pmc_rcu(in_dev, pmc) { | |
2076 | if (*pmca == pmc->multiaddr) | |
2077 | break; | |
2078 | } | |
2079 | if (!pmc) { | |
2080 | /* MCA not found?? bug */ | |
2081 | rcu_read_unlock(); | |
2082 | return -ESRCH; | |
2083 | } | |
2084 | spin_lock_bh(&pmc->lock); | |
2085 | rcu_read_unlock(); | |
2086 | ||
2087 | #ifdef CONFIG_IP_MULTICAST | |
2088 | sf_markstate(pmc); | |
2089 | #endif | |
2090 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
2091 | if (!delta) | |
2092 | pmc->sfcount[sfmode]++; | |
2093 | err = 0; | |
2094 | for (i = 0; i < sfcount; i++) { | |
2095 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); | |
2096 | if (err) | |
2097 | break; | |
2098 | } | |
2099 | if (err) { | |
2100 | int j; | |
2101 | ||
2102 | if (!delta) | |
2103 | pmc->sfcount[sfmode]--; | |
2104 | for (j = 0; j < i; j++) | |
2105 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); | |
2106 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { | |
2107 | #ifdef CONFIG_IP_MULTICAST | |
2108 | struct ip_sf_list *psf; | |
2109 | struct net *net = dev_net(pmc->interface->dev); | |
2110 | in_dev = pmc->interface; | |
2111 | #endif | |
2112 | ||
2113 | /* filter mode change */ | |
2114 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
2115 | pmc->sfmode = MCAST_EXCLUDE; | |
2116 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
2117 | pmc->sfmode = MCAST_INCLUDE; | |
2118 | #ifdef CONFIG_IP_MULTICAST | |
2119 | /* else no filters; keep old mode for reports */ | |
2120 | ||
2121 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
2122 | in_dev->mr_ifc_count = pmc->crcount; | |
2123 | for (psf = pmc->sources; psf; psf = psf->sf_next) | |
2124 | psf->sf_crcount = 0; | |
2125 | igmp_ifc_event(in_dev); | |
2126 | } else if (sf_setstate(pmc)) { | |
2127 | igmp_ifc_event(in_dev); | |
2128 | #endif | |
2129 | } | |
2130 | spin_unlock_bh(&pmc->lock); | |
2131 | return err; | |
2132 | } | |
2133 | ||
2134 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
2135 | { | |
2136 | struct ip_sf_list *tomb, *sources; | |
2137 | ||
2138 | spin_lock_bh(&pmc->lock); | |
2139 | tomb = pmc->tomb; | |
2140 | pmc->tomb = NULL; | |
2141 | sources = pmc->sources; | |
2142 | pmc->sources = NULL; | |
2143 | pmc->sfmode = MCAST_EXCLUDE; | |
2144 | pmc->sfcount[MCAST_INCLUDE] = 0; | |
2145 | pmc->sfcount[MCAST_EXCLUDE] = 1; | |
2146 | spin_unlock_bh(&pmc->lock); | |
2147 | ||
2148 | ip_sf_list_clear_all(tomb); | |
2149 | ip_sf_list_clear_all(sources); | |
2150 | } | |
2151 | ||
2152 | /* Join a multicast group | |
2153 | */ | |
2154 | static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr, | |
2155 | unsigned int mode) | |
2156 | { | |
2157 | __be32 addr = imr->imr_multiaddr.s_addr; | |
2158 | struct ip_mc_socklist *iml, *i; | |
2159 | struct in_device *in_dev; | |
2160 | struct inet_sock *inet = inet_sk(sk); | |
2161 | struct net *net = sock_net(sk); | |
2162 | int ifindex; | |
2163 | int count = 0; | |
2164 | int err; | |
2165 | ||
2166 | ASSERT_RTNL(); | |
2167 | ||
2168 | if (!ipv4_is_multicast(addr)) | |
2169 | return -EINVAL; | |
2170 | ||
2171 | in_dev = ip_mc_find_dev(net, imr); | |
2172 | ||
2173 | if (!in_dev) { | |
2174 | err = -ENODEV; | |
2175 | goto done; | |
2176 | } | |
2177 | ||
2178 | err = -EADDRINUSE; | |
2179 | ifindex = imr->imr_ifindex; | |
2180 | for_each_pmc_rtnl(inet, i) { | |
2181 | if (i->multi.imr_multiaddr.s_addr == addr && | |
2182 | i->multi.imr_ifindex == ifindex) | |
2183 | goto done; | |
2184 | count++; | |
2185 | } | |
2186 | err = -ENOBUFS; | |
2187 | if (count >= net->ipv4.sysctl_igmp_max_memberships) | |
2188 | goto done; | |
2189 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); | |
2190 | if (!iml) | |
2191 | goto done; | |
2192 | ||
2193 | memcpy(&iml->multi, imr, sizeof(*imr)); | |
2194 | iml->next_rcu = inet->mc_list; | |
2195 | iml->sflist = NULL; | |
2196 | iml->sfmode = mode; | |
2197 | rcu_assign_pointer(inet->mc_list, iml); | |
2198 | ____ip_mc_inc_group(in_dev, addr, mode, GFP_KERNEL); | |
2199 | err = 0; | |
2200 | done: | |
2201 | return err; | |
2202 | } | |
2203 | ||
2204 | /* Join ASM (Any-Source Multicast) group | |
2205 | */ | |
2206 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
2207 | { | |
2208 | return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE); | |
2209 | } | |
2210 | EXPORT_SYMBOL(ip_mc_join_group); | |
2211 | ||
2212 | /* Join SSM (Source-Specific Multicast) group | |
2213 | */ | |
2214 | int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, | |
2215 | unsigned int mode) | |
2216 | { | |
2217 | return __ip_mc_join_group(sk, imr, mode); | |
2218 | } | |
2219 | ||
2220 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
2221 | struct in_device *in_dev) | |
2222 | { | |
2223 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); | |
2224 | int err; | |
2225 | ||
2226 | if (!psf) { | |
2227 | /* any-source empty exclude case */ | |
2228 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2229 | iml->sfmode, 0, NULL, 0); | |
2230 | } | |
2231 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2232 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); | |
2233 | RCU_INIT_POINTER(iml->sflist, NULL); | |
2234 | /* decrease mem now to avoid the memleak warning */ | |
2235 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
2236 | kfree_rcu(psf, rcu); | |
2237 | return err; | |
2238 | } | |
2239 | ||
2240 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
2241 | { | |
2242 | struct inet_sock *inet = inet_sk(sk); | |
2243 | struct ip_mc_socklist *iml; | |
2244 | struct ip_mc_socklist __rcu **imlp; | |
2245 | struct in_device *in_dev; | |
2246 | struct net *net = sock_net(sk); | |
2247 | __be32 group = imr->imr_multiaddr.s_addr; | |
2248 | u32 ifindex; | |
2249 | int ret = -EADDRNOTAVAIL; | |
2250 | ||
2251 | ASSERT_RTNL(); | |
2252 | ||
2253 | in_dev = ip_mc_find_dev(net, imr); | |
2254 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { | |
2255 | ret = -ENODEV; | |
2256 | goto out; | |
2257 | } | |
2258 | ifindex = imr->imr_ifindex; | |
2259 | for (imlp = &inet->mc_list; | |
2260 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2261 | imlp = &iml->next_rcu) { | |
2262 | if (iml->multi.imr_multiaddr.s_addr != group) | |
2263 | continue; | |
2264 | if (ifindex) { | |
2265 | if (iml->multi.imr_ifindex != ifindex) | |
2266 | continue; | |
2267 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2268 | iml->multi.imr_address.s_addr) | |
2269 | continue; | |
2270 | ||
2271 | (void) ip_mc_leave_src(sk, iml, in_dev); | |
2272 | ||
2273 | *imlp = iml->next_rcu; | |
2274 | ||
2275 | if (in_dev) | |
2276 | ip_mc_dec_group(in_dev, group); | |
2277 | ||
2278 | /* decrease mem now to avoid the memleak warning */ | |
2279 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
2280 | kfree_rcu(iml, rcu); | |
2281 | return 0; | |
2282 | } | |
2283 | out: | |
2284 | return ret; | |
2285 | } | |
2286 | EXPORT_SYMBOL(ip_mc_leave_group); | |
2287 | ||
2288 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2289 | ip_mreq_source *mreqs, int ifindex) | |
2290 | { | |
2291 | int err; | |
2292 | struct ip_mreqn imr; | |
2293 | __be32 addr = mreqs->imr_multiaddr; | |
2294 | struct ip_mc_socklist *pmc; | |
2295 | struct in_device *in_dev = NULL; | |
2296 | struct inet_sock *inet = inet_sk(sk); | |
2297 | struct ip_sf_socklist *psl; | |
2298 | struct net *net = sock_net(sk); | |
2299 | int leavegroup = 0; | |
2300 | int i, j, rv; | |
2301 | ||
2302 | if (!ipv4_is_multicast(addr)) | |
2303 | return -EINVAL; | |
2304 | ||
2305 | ASSERT_RTNL(); | |
2306 | ||
2307 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2308 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2309 | imr.imr_ifindex = ifindex; | |
2310 | in_dev = ip_mc_find_dev(net, &imr); | |
2311 | ||
2312 | if (!in_dev) { | |
2313 | err = -ENODEV; | |
2314 | goto done; | |
2315 | } | |
2316 | err = -EADDRNOTAVAIL; | |
2317 | ||
2318 | for_each_pmc_rtnl(inet, pmc) { | |
2319 | if ((pmc->multi.imr_multiaddr.s_addr == | |
2320 | imr.imr_multiaddr.s_addr) && | |
2321 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
2322 | break; | |
2323 | } | |
2324 | if (!pmc) { /* must have a prior join */ | |
2325 | err = -EINVAL; | |
2326 | goto done; | |
2327 | } | |
2328 | /* if a source filter was set, must be the same mode as before */ | |
2329 | if (pmc->sflist) { | |
2330 | if (pmc->sfmode != omode) { | |
2331 | err = -EINVAL; | |
2332 | goto done; | |
2333 | } | |
2334 | } else if (pmc->sfmode != omode) { | |
2335 | /* allow mode switches for empty-set filters */ | |
2336 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
2337 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, | |
2338 | NULL, 0); | |
2339 | pmc->sfmode = omode; | |
2340 | } | |
2341 | ||
2342 | psl = rtnl_dereference(pmc->sflist); | |
2343 | if (!add) { | |
2344 | if (!psl) | |
2345 | goto done; /* err = -EADDRNOTAVAIL */ | |
2346 | rv = !0; | |
2347 | for (i = 0; i < psl->sl_count; i++) { | |
2348 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
2349 | sizeof(__be32)); | |
2350 | if (rv == 0) | |
2351 | break; | |
2352 | } | |
2353 | if (rv) /* source not found */ | |
2354 | goto done; /* err = -EADDRNOTAVAIL */ | |
2355 | ||
2356 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ | |
2357 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2358 | leavegroup = 1; | |
2359 | goto done; | |
2360 | } | |
2361 | ||
2362 | /* update the interface filter */ | |
2363 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, | |
2364 | &mreqs->imr_sourceaddr, 1); | |
2365 | ||
2366 | for (j = i+1; j < psl->sl_count; j++) | |
2367 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
2368 | psl->sl_count--; | |
2369 | err = 0; | |
2370 | goto done; | |
2371 | } | |
2372 | /* else, add a new source to the filter */ | |
2373 | ||
2374 | if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { | |
2375 | err = -ENOBUFS; | |
2376 | goto done; | |
2377 | } | |
2378 | if (!psl || psl->sl_count == psl->sl_max) { | |
2379 | struct ip_sf_socklist *newpsl; | |
2380 | int count = IP_SFBLOCK; | |
2381 | ||
2382 | if (psl) | |
2383 | count += psl->sl_max; | |
2384 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); | |
2385 | if (!newpsl) { | |
2386 | err = -ENOBUFS; | |
2387 | goto done; | |
2388 | } | |
2389 | newpsl->sl_max = count; | |
2390 | newpsl->sl_count = count - IP_SFBLOCK; | |
2391 | if (psl) { | |
2392 | for (i = 0; i < psl->sl_count; i++) | |
2393 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
2394 | /* decrease mem now to avoid the memleak warning */ | |
2395 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
2396 | kfree_rcu(psl, rcu); | |
2397 | } | |
2398 | rcu_assign_pointer(pmc->sflist, newpsl); | |
2399 | psl = newpsl; | |
2400 | } | |
2401 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
2402 | for (i = 0; i < psl->sl_count; i++) { | |
2403 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
2404 | sizeof(__be32)); | |
2405 | if (rv == 0) | |
2406 | break; | |
2407 | } | |
2408 | if (rv == 0) /* address already there is an error */ | |
2409 | goto done; | |
2410 | for (j = psl->sl_count-1; j >= i; j--) | |
2411 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
2412 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2413 | psl->sl_count++; | |
2414 | err = 0; | |
2415 | /* update the interface list */ | |
2416 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, | |
2417 | &mreqs->imr_sourceaddr, 1); | |
2418 | done: | |
2419 | if (leavegroup) | |
2420 | err = ip_mc_leave_group(sk, &imr); | |
2421 | return err; | |
2422 | } | |
2423 | ||
2424 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2425 | { | |
2426 | int err = 0; | |
2427 | struct ip_mreqn imr; | |
2428 | __be32 addr = msf->imsf_multiaddr; | |
2429 | struct ip_mc_socklist *pmc; | |
2430 | struct in_device *in_dev; | |
2431 | struct inet_sock *inet = inet_sk(sk); | |
2432 | struct ip_sf_socklist *newpsl, *psl; | |
2433 | struct net *net = sock_net(sk); | |
2434 | int leavegroup = 0; | |
2435 | ||
2436 | if (!ipv4_is_multicast(addr)) | |
2437 | return -EINVAL; | |
2438 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2439 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2440 | return -EINVAL; | |
2441 | ||
2442 | ASSERT_RTNL(); | |
2443 | ||
2444 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2445 | imr.imr_address.s_addr = msf->imsf_interface; | |
2446 | imr.imr_ifindex = ifindex; | |
2447 | in_dev = ip_mc_find_dev(net, &imr); | |
2448 | ||
2449 | if (!in_dev) { | |
2450 | err = -ENODEV; | |
2451 | goto done; | |
2452 | } | |
2453 | ||
2454 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ | |
2455 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2456 | leavegroup = 1; | |
2457 | goto done; | |
2458 | } | |
2459 | ||
2460 | for_each_pmc_rtnl(inet, pmc) { | |
2461 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
2462 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2463 | break; | |
2464 | } | |
2465 | if (!pmc) { /* must have a prior join */ | |
2466 | err = -EINVAL; | |
2467 | goto done; | |
2468 | } | |
2469 | if (msf->imsf_numsrc) { | |
2470 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), | |
2471 | GFP_KERNEL); | |
2472 | if (!newpsl) { | |
2473 | err = -ENOBUFS; | |
2474 | goto done; | |
2475 | } | |
2476 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2477 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2478 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2479 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2480 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2481 | if (err) { | |
2482 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2483 | goto done; | |
2484 | } | |
2485 | } else { | |
2486 | newpsl = NULL; | |
2487 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2488 | msf->imsf_fmode, 0, NULL, 0); | |
2489 | } | |
2490 | psl = rtnl_dereference(pmc->sflist); | |
2491 | if (psl) { | |
2492 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2493 | psl->sl_count, psl->sl_addr, 0); | |
2494 | /* decrease mem now to avoid the memleak warning */ | |
2495 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
2496 | kfree_rcu(psl, rcu); | |
2497 | } else | |
2498 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2499 | 0, NULL, 0); | |
2500 | rcu_assign_pointer(pmc->sflist, newpsl); | |
2501 | pmc->sfmode = msf->imsf_fmode; | |
2502 | err = 0; | |
2503 | done: | |
2504 | if (leavegroup) | |
2505 | err = ip_mc_leave_group(sk, &imr); | |
2506 | return err; | |
2507 | } | |
2508 | ||
2509 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2510 | struct ip_msfilter __user *optval, int __user *optlen) | |
2511 | { | |
2512 | int err, len, count, copycount; | |
2513 | struct ip_mreqn imr; | |
2514 | __be32 addr = msf->imsf_multiaddr; | |
2515 | struct ip_mc_socklist *pmc; | |
2516 | struct in_device *in_dev; | |
2517 | struct inet_sock *inet = inet_sk(sk); | |
2518 | struct ip_sf_socklist *psl; | |
2519 | struct net *net = sock_net(sk); | |
2520 | ||
2521 | ASSERT_RTNL(); | |
2522 | ||
2523 | if (!ipv4_is_multicast(addr)) | |
2524 | return -EINVAL; | |
2525 | ||
2526 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2527 | imr.imr_address.s_addr = msf->imsf_interface; | |
2528 | imr.imr_ifindex = 0; | |
2529 | in_dev = ip_mc_find_dev(net, &imr); | |
2530 | ||
2531 | if (!in_dev) { | |
2532 | err = -ENODEV; | |
2533 | goto done; | |
2534 | } | |
2535 | err = -EADDRNOTAVAIL; | |
2536 | ||
2537 | for_each_pmc_rtnl(inet, pmc) { | |
2538 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
2539 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2540 | break; | |
2541 | } | |
2542 | if (!pmc) /* must have a prior join */ | |
2543 | goto done; | |
2544 | msf->imsf_fmode = pmc->sfmode; | |
2545 | psl = rtnl_dereference(pmc->sflist); | |
2546 | if (!psl) { | |
2547 | len = 0; | |
2548 | count = 0; | |
2549 | } else { | |
2550 | count = psl->sl_count; | |
2551 | } | |
2552 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2553 | len = copycount * sizeof(psl->sl_addr[0]); | |
2554 | msf->imsf_numsrc = count; | |
2555 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2556 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2557 | return -EFAULT; | |
2558 | } | |
2559 | if (len && | |
2560 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2561 | return -EFAULT; | |
2562 | return 0; | |
2563 | done: | |
2564 | return err; | |
2565 | } | |
2566 | ||
2567 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2568 | struct sockaddr_storage __user *p) | |
2569 | { | |
2570 | int i, count, copycount; | |
2571 | struct sockaddr_in *psin; | |
2572 | __be32 addr; | |
2573 | struct ip_mc_socklist *pmc; | |
2574 | struct inet_sock *inet = inet_sk(sk); | |
2575 | struct ip_sf_socklist *psl; | |
2576 | ||
2577 | ASSERT_RTNL(); | |
2578 | ||
2579 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2580 | if (psin->sin_family != AF_INET) | |
2581 | return -EINVAL; | |
2582 | addr = psin->sin_addr.s_addr; | |
2583 | if (!ipv4_is_multicast(addr)) | |
2584 | return -EINVAL; | |
2585 | ||
2586 | for_each_pmc_rtnl(inet, pmc) { | |
2587 | if (pmc->multi.imr_multiaddr.s_addr == addr && | |
2588 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2589 | break; | |
2590 | } | |
2591 | if (!pmc) /* must have a prior join */ | |
2592 | return -EADDRNOTAVAIL; | |
2593 | gsf->gf_fmode = pmc->sfmode; | |
2594 | psl = rtnl_dereference(pmc->sflist); | |
2595 | count = psl ? psl->sl_count : 0; | |
2596 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2597 | gsf->gf_numsrc = count; | |
2598 | for (i = 0; i < copycount; i++, p++) { | |
2599 | struct sockaddr_storage ss; | |
2600 | ||
2601 | psin = (struct sockaddr_in *)&ss; | |
2602 | memset(&ss, 0, sizeof(ss)); | |
2603 | psin->sin_family = AF_INET; | |
2604 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2605 | if (copy_to_user(p, &ss, sizeof(ss))) | |
2606 | return -EFAULT; | |
2607 | } | |
2608 | return 0; | |
2609 | } | |
2610 | ||
2611 | /* | |
2612 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2613 | */ | |
2614 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, | |
2615 | int dif, int sdif) | |
2616 | { | |
2617 | struct inet_sock *inet = inet_sk(sk); | |
2618 | struct ip_mc_socklist *pmc; | |
2619 | struct ip_sf_socklist *psl; | |
2620 | int i; | |
2621 | int ret; | |
2622 | ||
2623 | ret = 1; | |
2624 | if (!ipv4_is_multicast(loc_addr)) | |
2625 | goto out; | |
2626 | ||
2627 | rcu_read_lock(); | |
2628 | for_each_pmc_rcu(inet, pmc) { | |
2629 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && | |
2630 | (pmc->multi.imr_ifindex == dif || | |
2631 | (sdif && pmc->multi.imr_ifindex == sdif))) | |
2632 | break; | |
2633 | } | |
2634 | ret = inet->mc_all; | |
2635 | if (!pmc) | |
2636 | goto unlock; | |
2637 | psl = rcu_dereference(pmc->sflist); | |
2638 | ret = (pmc->sfmode == MCAST_EXCLUDE); | |
2639 | if (!psl) | |
2640 | goto unlock; | |
2641 | ||
2642 | for (i = 0; i < psl->sl_count; i++) { | |
2643 | if (psl->sl_addr[i] == rmt_addr) | |
2644 | break; | |
2645 | } | |
2646 | ret = 0; | |
2647 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) | |
2648 | goto unlock; | |
2649 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) | |
2650 | goto unlock; | |
2651 | ret = 1; | |
2652 | unlock: | |
2653 | rcu_read_unlock(); | |
2654 | out: | |
2655 | return ret; | |
2656 | } | |
2657 | ||
2658 | /* | |
2659 | * A socket is closing. | |
2660 | */ | |
2661 | ||
2662 | void ip_mc_drop_socket(struct sock *sk) | |
2663 | { | |
2664 | struct inet_sock *inet = inet_sk(sk); | |
2665 | struct ip_mc_socklist *iml; | |
2666 | struct net *net = sock_net(sk); | |
2667 | ||
2668 | if (!inet->mc_list) | |
2669 | return; | |
2670 | ||
2671 | rtnl_lock(); | |
2672 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { | |
2673 | struct in_device *in_dev; | |
2674 | ||
2675 | inet->mc_list = iml->next_rcu; | |
2676 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); | |
2677 | (void) ip_mc_leave_src(sk, iml, in_dev); | |
2678 | if (in_dev) | |
2679 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); | |
2680 | /* decrease mem now to avoid the memleak warning */ | |
2681 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
2682 | kfree_rcu(iml, rcu); | |
2683 | } | |
2684 | rtnl_unlock(); | |
2685 | } | |
2686 | ||
2687 | /* called with rcu_read_lock() */ | |
2688 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) | |
2689 | { | |
2690 | struct ip_mc_list *im; | |
2691 | struct ip_mc_list __rcu **mc_hash; | |
2692 | struct ip_sf_list *psf; | |
2693 | int rv = 0; | |
2694 | ||
2695 | mc_hash = rcu_dereference(in_dev->mc_hash); | |
2696 | if (mc_hash) { | |
2697 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); | |
2698 | ||
2699 | for (im = rcu_dereference(mc_hash[hash]); | |
2700 | im != NULL; | |
2701 | im = rcu_dereference(im->next_hash)) { | |
2702 | if (im->multiaddr == mc_addr) | |
2703 | break; | |
2704 | } | |
2705 | } else { | |
2706 | for_each_pmc_rcu(in_dev, im) { | |
2707 | if (im->multiaddr == mc_addr) | |
2708 | break; | |
2709 | } | |
2710 | } | |
2711 | if (im && proto == IPPROTO_IGMP) { | |
2712 | rv = 1; | |
2713 | } else if (im) { | |
2714 | if (src_addr) { | |
2715 | for (psf = im->sources; psf; psf = psf->sf_next) { | |
2716 | if (psf->sf_inaddr == src_addr) | |
2717 | break; | |
2718 | } | |
2719 | if (psf) | |
2720 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2721 | psf->sf_count[MCAST_EXCLUDE] != | |
2722 | im->sfcount[MCAST_EXCLUDE]; | |
2723 | else | |
2724 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2725 | } else | |
2726 | rv = 1; /* unspecified source; tentatively allow */ | |
2727 | } | |
2728 | return rv; | |
2729 | } | |
2730 | ||
2731 | #if defined(CONFIG_PROC_FS) | |
2732 | struct igmp_mc_iter_state { | |
2733 | struct seq_net_private p; | |
2734 | struct net_device *dev; | |
2735 | struct in_device *in_dev; | |
2736 | }; | |
2737 | ||
2738 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2739 | ||
2740 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2741 | { | |
2742 | struct net *net = seq_file_net(seq); | |
2743 | struct ip_mc_list *im = NULL; | |
2744 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2745 | ||
2746 | state->in_dev = NULL; | |
2747 | for_each_netdev_rcu(net, state->dev) { | |
2748 | struct in_device *in_dev; | |
2749 | ||
2750 | in_dev = __in_dev_get_rcu(state->dev); | |
2751 | if (!in_dev) | |
2752 | continue; | |
2753 | im = rcu_dereference(in_dev->mc_list); | |
2754 | if (im) { | |
2755 | state->in_dev = in_dev; | |
2756 | break; | |
2757 | } | |
2758 | } | |
2759 | return im; | |
2760 | } | |
2761 | ||
2762 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2763 | { | |
2764 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2765 | ||
2766 | im = rcu_dereference(im->next_rcu); | |
2767 | while (!im) { | |
2768 | state->dev = next_net_device_rcu(state->dev); | |
2769 | if (!state->dev) { | |
2770 | state->in_dev = NULL; | |
2771 | break; | |
2772 | } | |
2773 | state->in_dev = __in_dev_get_rcu(state->dev); | |
2774 | if (!state->in_dev) | |
2775 | continue; | |
2776 | im = rcu_dereference(state->in_dev->mc_list); | |
2777 | } | |
2778 | return im; | |
2779 | } | |
2780 | ||
2781 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2782 | { | |
2783 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2784 | if (im) | |
2785 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2786 | --pos; | |
2787 | return pos ? NULL : im; | |
2788 | } | |
2789 | ||
2790 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
2791 | __acquires(rcu) | |
2792 | { | |
2793 | rcu_read_lock(); | |
2794 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2795 | } | |
2796 | ||
2797 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2798 | { | |
2799 | struct ip_mc_list *im; | |
2800 | if (v == SEQ_START_TOKEN) | |
2801 | im = igmp_mc_get_first(seq); | |
2802 | else | |
2803 | im = igmp_mc_get_next(seq, v); | |
2804 | ++*pos; | |
2805 | return im; | |
2806 | } | |
2807 | ||
2808 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
2809 | __releases(rcu) | |
2810 | { | |
2811 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2812 | ||
2813 | state->in_dev = NULL; | |
2814 | state->dev = NULL; | |
2815 | rcu_read_unlock(); | |
2816 | } | |
2817 | ||
2818 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2819 | { | |
2820 | if (v == SEQ_START_TOKEN) | |
2821 | seq_puts(seq, | |
2822 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); | |
2823 | else { | |
2824 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2825 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2826 | char *querier; | |
2827 | long delta; | |
2828 | ||
2829 | #ifdef CONFIG_IP_MULTICAST | |
2830 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2831 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2832 | "V3"; | |
2833 | #else | |
2834 | querier = "NONE"; | |
2835 | #endif | |
2836 | ||
2837 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { | |
2838 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", | |
2839 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); | |
2840 | } | |
2841 | ||
2842 | delta = im->timer.expires - jiffies; | |
2843 | seq_printf(seq, | |
2844 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", | |
2845 | im->multiaddr, im->users, | |
2846 | im->tm_running, | |
2847 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
2848 | im->reporter); | |
2849 | } | |
2850 | return 0; | |
2851 | } | |
2852 | ||
2853 | static const struct seq_operations igmp_mc_seq_ops = { | |
2854 | .start = igmp_mc_seq_start, | |
2855 | .next = igmp_mc_seq_next, | |
2856 | .stop = igmp_mc_seq_stop, | |
2857 | .show = igmp_mc_seq_show, | |
2858 | }; | |
2859 | ||
2860 | struct igmp_mcf_iter_state { | |
2861 | struct seq_net_private p; | |
2862 | struct net_device *dev; | |
2863 | struct in_device *idev; | |
2864 | struct ip_mc_list *im; | |
2865 | }; | |
2866 | ||
2867 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2868 | ||
2869 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2870 | { | |
2871 | struct net *net = seq_file_net(seq); | |
2872 | struct ip_sf_list *psf = NULL; | |
2873 | struct ip_mc_list *im = NULL; | |
2874 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2875 | ||
2876 | state->idev = NULL; | |
2877 | state->im = NULL; | |
2878 | for_each_netdev_rcu(net, state->dev) { | |
2879 | struct in_device *idev; | |
2880 | idev = __in_dev_get_rcu(state->dev); | |
2881 | if (unlikely(!idev)) | |
2882 | continue; | |
2883 | im = rcu_dereference(idev->mc_list); | |
2884 | if (likely(im)) { | |
2885 | spin_lock_bh(&im->lock); | |
2886 | psf = im->sources; | |
2887 | if (likely(psf)) { | |
2888 | state->im = im; | |
2889 | state->idev = idev; | |
2890 | break; | |
2891 | } | |
2892 | spin_unlock_bh(&im->lock); | |
2893 | } | |
2894 | } | |
2895 | return psf; | |
2896 | } | |
2897 | ||
2898 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2899 | { | |
2900 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2901 | ||
2902 | psf = psf->sf_next; | |
2903 | while (!psf) { | |
2904 | spin_unlock_bh(&state->im->lock); | |
2905 | state->im = state->im->next; | |
2906 | while (!state->im) { | |
2907 | state->dev = next_net_device_rcu(state->dev); | |
2908 | if (!state->dev) { | |
2909 | state->idev = NULL; | |
2910 | goto out; | |
2911 | } | |
2912 | state->idev = __in_dev_get_rcu(state->dev); | |
2913 | if (!state->idev) | |
2914 | continue; | |
2915 | state->im = rcu_dereference(state->idev->mc_list); | |
2916 | } | |
2917 | if (!state->im) | |
2918 | break; | |
2919 | spin_lock_bh(&state->im->lock); | |
2920 | psf = state->im->sources; | |
2921 | } | |
2922 | out: | |
2923 | return psf; | |
2924 | } | |
2925 | ||
2926 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2927 | { | |
2928 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2929 | if (psf) | |
2930 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2931 | --pos; | |
2932 | return pos ? NULL : psf; | |
2933 | } | |
2934 | ||
2935 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
2936 | __acquires(rcu) | |
2937 | { | |
2938 | rcu_read_lock(); | |
2939 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; | |
2940 | } | |
2941 | ||
2942 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2943 | { | |
2944 | struct ip_sf_list *psf; | |
2945 | if (v == SEQ_START_TOKEN) | |
2946 | psf = igmp_mcf_get_first(seq); | |
2947 | else | |
2948 | psf = igmp_mcf_get_next(seq, v); | |
2949 | ++*pos; | |
2950 | return psf; | |
2951 | } | |
2952 | ||
2953 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
2954 | __releases(rcu) | |
2955 | { | |
2956 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2957 | if (likely(state->im)) { | |
2958 | spin_unlock_bh(&state->im->lock); | |
2959 | state->im = NULL; | |
2960 | } | |
2961 | state->idev = NULL; | |
2962 | state->dev = NULL; | |
2963 | rcu_read_unlock(); | |
2964 | } | |
2965 | ||
2966 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2967 | { | |
2968 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2969 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2970 | ||
2971 | if (v == SEQ_START_TOKEN) { | |
2972 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); | |
2973 | } else { | |
2974 | seq_printf(seq, | |
2975 | "%3d %6.6s 0x%08x " | |
2976 | "0x%08x %6lu %6lu\n", | |
2977 | state->dev->ifindex, state->dev->name, | |
2978 | ntohl(state->im->multiaddr), | |
2979 | ntohl(psf->sf_inaddr), | |
2980 | psf->sf_count[MCAST_INCLUDE], | |
2981 | psf->sf_count[MCAST_EXCLUDE]); | |
2982 | } | |
2983 | return 0; | |
2984 | } | |
2985 | ||
2986 | static const struct seq_operations igmp_mcf_seq_ops = { | |
2987 | .start = igmp_mcf_seq_start, | |
2988 | .next = igmp_mcf_seq_next, | |
2989 | .stop = igmp_mcf_seq_stop, | |
2990 | .show = igmp_mcf_seq_show, | |
2991 | }; | |
2992 | ||
2993 | static int __net_init igmp_net_init(struct net *net) | |
2994 | { | |
2995 | struct proc_dir_entry *pde; | |
2996 | int err; | |
2997 | ||
2998 | pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops, | |
2999 | sizeof(struct igmp_mc_iter_state)); | |
3000 | if (!pde) | |
3001 | goto out_igmp; | |
3002 | pde = proc_create_net("mcfilter", 0444, net->proc_net, | |
3003 | &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state)); | |
3004 | if (!pde) | |
3005 | goto out_mcfilter; | |
3006 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, | |
3007 | SOCK_DGRAM, 0, net); | |
3008 | if (err < 0) { | |
3009 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
3010 | err); | |
3011 | goto out_sock; | |
3012 | } | |
3013 | ||
3014 | return 0; | |
3015 | ||
3016 | out_sock: | |
3017 | remove_proc_entry("mcfilter", net->proc_net); | |
3018 | out_mcfilter: | |
3019 | remove_proc_entry("igmp", net->proc_net); | |
3020 | out_igmp: | |
3021 | return -ENOMEM; | |
3022 | } | |
3023 | ||
3024 | static void __net_exit igmp_net_exit(struct net *net) | |
3025 | { | |
3026 | remove_proc_entry("mcfilter", net->proc_net); | |
3027 | remove_proc_entry("igmp", net->proc_net); | |
3028 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); | |
3029 | } | |
3030 | ||
3031 | static struct pernet_operations igmp_net_ops = { | |
3032 | .init = igmp_net_init, | |
3033 | .exit = igmp_net_exit, | |
3034 | }; | |
3035 | #endif | |
3036 | ||
3037 | static int igmp_netdev_event(struct notifier_block *this, | |
3038 | unsigned long event, void *ptr) | |
3039 | { | |
3040 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3041 | struct in_device *in_dev; | |
3042 | ||
3043 | switch (event) { | |
3044 | case NETDEV_RESEND_IGMP: | |
3045 | in_dev = __in_dev_get_rtnl(dev); | |
3046 | if (in_dev) | |
3047 | ip_mc_rejoin_groups(in_dev); | |
3048 | break; | |
3049 | default: | |
3050 | break; | |
3051 | } | |
3052 | return NOTIFY_DONE; | |
3053 | } | |
3054 | ||
3055 | static struct notifier_block igmp_notifier = { | |
3056 | .notifier_call = igmp_netdev_event, | |
3057 | }; | |
3058 | ||
3059 | int __init igmp_mc_init(void) | |
3060 | { | |
3061 | #if defined(CONFIG_PROC_FS) | |
3062 | int err; | |
3063 | ||
3064 | err = register_pernet_subsys(&igmp_net_ops); | |
3065 | if (err) | |
3066 | return err; | |
3067 | err = register_netdevice_notifier(&igmp_notifier); | |
3068 | if (err) | |
3069 | goto reg_notif_fail; | |
3070 | return 0; | |
3071 | ||
3072 | reg_notif_fail: | |
3073 | unregister_pernet_subsys(&igmp_net_ops); | |
3074 | return err; | |
3075 | #else | |
3076 | return register_netdevice_notifier(&igmp_notifier); | |
3077 | #endif | |
3078 | } |