Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
7c0f6ba6 | 75 | #include <linux/uaccess.h> |
1da177e4 LT |
76 | #include <linux/types.h> |
77 | #include <linux/kernel.h> | |
78 | #include <linux/jiffies.h> | |
79 | #include <linux/string.h> | |
80 | #include <linux/socket.h> | |
81 | #include <linux/sockios.h> | |
82 | #include <linux/in.h> | |
83 | #include <linux/inet.h> | |
84 | #include <linux/netdevice.h> | |
85 | #include <linux/skbuff.h> | |
86 | #include <linux/inetdevice.h> | |
87 | #include <linux/igmp.h> | |
88 | #include <linux/if_arp.h> | |
89 | #include <linux/rtnetlink.h> | |
90 | #include <linux/times.h> | |
9d4a0314 | 91 | #include <linux/pkt_sched.h> |
a46182b0 | 92 | #include <linux/byteorder/generic.h> |
14c85021 | 93 | |
457c4cbc | 94 | #include <net/net_namespace.h> |
14c85021 | 95 | #include <net/arp.h> |
1da177e4 LT |
96 | #include <net/ip.h> |
97 | #include <net/protocol.h> | |
98 | #include <net/route.h> | |
99 | #include <net/sock.h> | |
100 | #include <net/checksum.h> | |
93a714d6 | 101 | #include <net/inet_common.h> |
1da177e4 LT |
102 | #include <linux/netfilter_ipv4.h> |
103 | #ifdef CONFIG_IP_MROUTE | |
104 | #include <linux/mroute.h> | |
105 | #endif | |
106 | #ifdef CONFIG_PROC_FS | |
107 | #include <linux/proc_fs.h> | |
108 | #include <linux/seq_file.h> | |
109 | #endif | |
110 | ||
1da177e4 LT |
111 | #ifdef CONFIG_IP_MULTICAST |
112 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
113 | ||
436f7c20 FF |
114 | #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) |
115 | #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) | |
966c37f2 | 116 | #define IGMP_QUERY_INTERVAL (125*HZ) |
436f7c20 | 117 | #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) |
1da177e4 | 118 | |
436f7c20 | 119 | #define IGMP_INITIAL_REPORT_DELAY (1) |
1da177e4 | 120 | |
436f7c20 | 121 | /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! |
1da177e4 LT |
122 | * IGMP specs require to report membership immediately after |
123 | * joining a group, but we delay the first report by a | |
124 | * small interval. It seems more natural and still does not | |
125 | * contradict to specs provided this delay is small enough. | |
126 | */ | |
127 | ||
42f811b8 | 128 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 129 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
130 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
131 | ((in_dev)->mr_v1_seen && \ | |
132 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
133 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 134 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
135 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
136 | ((in_dev)->mr_v2_seen && \ | |
137 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 | 138 | |
cab70040 WM |
139 | static int unsolicited_report_interval(struct in_device *in_dev) |
140 | { | |
2690048c WM |
141 | int interval_ms, interval_jiffies; |
142 | ||
cab70040 | 143 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
2690048c WM |
144 | interval_ms = IN_DEV_CONF_GET( |
145 | in_dev, | |
146 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
cab70040 | 147 | else /* v3 */ |
2690048c WM |
148 | interval_ms = IN_DEV_CONF_GET( |
149 | in_dev, | |
150 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
151 | ||
152 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
153 | ||
154 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
155 | * we always return a positive value. | |
156 | */ | |
157 | if (interval_jiffies <= 0) | |
158 | interval_jiffies = 1; | |
159 | return interval_jiffies; | |
cab70040 WM |
160 | } |
161 | ||
1da177e4 | 162 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
24803f38 | 163 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
1da177e4 LT |
164 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
165 | static int sf_setstate(struct ip_mc_list *pmc); | |
166 | static void sf_markstate(struct ip_mc_list *pmc); | |
167 | #endif | |
168 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
169 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
170 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
171 | |
172 | static void ip_ma_put(struct ip_mc_list *im) | |
173 | { | |
8851ab52 | 174 | if (refcount_dec_and_test(&im->refcnt)) { |
1da177e4 | 175 | in_dev_put(im->interface); |
42ea299d | 176 | kfree_rcu(im, rcu); |
1da177e4 LT |
177 | } |
178 | } | |
179 | ||
d9aa9380 DM |
180 | #define for_each_pmc_rcu(in_dev, pmc) \ |
181 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
182 | pmc != NULL; \ | |
183 | pmc = rcu_dereference(pmc->next_rcu)) | |
184 | ||
185 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
186 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
187 | pmc != NULL; \ | |
188 | pmc = rtnl_dereference(pmc->next_rcu)) | |
189 | ||
1da177e4 LT |
190 | #ifdef CONFIG_IP_MULTICAST |
191 | ||
192 | /* | |
193 | * Timer management | |
194 | */ | |
195 | ||
1d7138de | 196 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
197 | { |
198 | spin_lock_bh(&im->lock); | |
199 | if (del_timer(&im->timer)) | |
8851ab52 | 200 | refcount_dec(&im->refcnt); |
a7e9ff73 | 201 | im->tm_running = 0; |
1da177e4 LT |
202 | im->reporter = 0; |
203 | im->unsolicit_count = 0; | |
204 | spin_unlock_bh(&im->lock); | |
205 | } | |
206 | ||
207 | /* It must be called with locked im->lock */ | |
208 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
209 | { | |
63862b5b | 210 | int tv = prandom_u32() % max_delay; |
1da177e4 | 211 | |
a7e9ff73 | 212 | im->tm_running = 1; |
1da177e4 | 213 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
8851ab52 | 214 | refcount_inc(&im->refcnt); |
1da177e4 LT |
215 | } |
216 | ||
217 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
218 | { | |
63862b5b | 219 | int tv = prandom_u32() % in_dev->mr_maxdelay; |
7ababb78 MT |
220 | unsigned long exp = jiffies + tv + 2; |
221 | ||
222 | if (in_dev->mr_gq_running && | |
223 | time_after_eq(exp, (in_dev->mr_gq_timer).expires)) | |
224 | return; | |
1da177e4 LT |
225 | |
226 | in_dev->mr_gq_running = 1; | |
7ababb78 | 227 | if (!mod_timer(&in_dev->mr_gq_timer, exp)) |
1da177e4 LT |
228 | in_dev_hold(in_dev); |
229 | } | |
230 | ||
231 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
232 | { | |
63862b5b | 233 | int tv = prandom_u32() % delay; |
1da177e4 LT |
234 | |
235 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
236 | in_dev_hold(in_dev); | |
237 | } | |
238 | ||
239 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
240 | { | |
241 | spin_lock_bh(&im->lock); | |
242 | im->unsolicit_count = 0; | |
243 | if (del_timer(&im->timer)) { | |
244 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
245 | add_timer(&im->timer); | |
a7e9ff73 | 246 | im->tm_running = 1; |
1da177e4 LT |
247 | spin_unlock_bh(&im->lock); |
248 | return; | |
249 | } | |
8851ab52 | 250 | refcount_dec(&im->refcnt); |
1da177e4 LT |
251 | } |
252 | igmp_start_timer(im, max_delay); | |
253 | spin_unlock_bh(&im->lock); | |
254 | } | |
255 | ||
256 | ||
257 | /* | |
258 | * Send an IGMP report. | |
259 | */ | |
260 | ||
261 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
262 | ||
263 | ||
264 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
265 | int gdeleted, int sdeleted) | |
266 | { | |
267 | switch (type) { | |
268 | case IGMPV3_MODE_IS_INCLUDE: | |
269 | case IGMPV3_MODE_IS_EXCLUDE: | |
270 | if (gdeleted || sdeleted) | |
271 | return 0; | |
ad12583f DS |
272 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
273 | if (pmc->sfmode == MCAST_INCLUDE) | |
274 | return 1; | |
275 | /* don't include if this source is excluded | |
276 | * in all filters | |
277 | */ | |
278 | if (psf->sf_count[MCAST_INCLUDE]) | |
279 | return type == IGMPV3_MODE_IS_INCLUDE; | |
280 | return pmc->sfcount[MCAST_EXCLUDE] == | |
281 | psf->sf_count[MCAST_EXCLUDE]; | |
282 | } | |
283 | return 0; | |
1da177e4 LT |
284 | case IGMPV3_CHANGE_TO_INCLUDE: |
285 | if (gdeleted || sdeleted) | |
286 | return 0; | |
287 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
288 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
289 | if (gdeleted || sdeleted) | |
290 | return 0; | |
291 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
292 | psf->sf_count[MCAST_INCLUDE]) | |
293 | return 0; | |
294 | return pmc->sfcount[MCAST_EXCLUDE] == | |
295 | psf->sf_count[MCAST_EXCLUDE]; | |
296 | case IGMPV3_ALLOW_NEW_SOURCES: | |
297 | if (gdeleted || !psf->sf_crcount) | |
298 | return 0; | |
299 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
300 | case IGMPV3_BLOCK_OLD_SOURCES: | |
301 | if (pmc->sfmode == MCAST_INCLUDE) | |
302 | return gdeleted || (psf->sf_crcount && sdeleted); | |
303 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
304 | } | |
305 | return 0; | |
306 | } | |
307 | ||
308 | static int | |
309 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
310 | { | |
311 | struct ip_sf_list *psf; | |
312 | int scount = 0; | |
313 | ||
c71151f0 | 314 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
315 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
316 | continue; | |
317 | scount++; | |
318 | } | |
319 | return scount; | |
320 | } | |
321 | ||
a46182b0 KC |
322 | /* source address selection per RFC 3376 section 4.2.13 */ |
323 | static __be32 igmpv3_get_srcaddr(struct net_device *dev, | |
324 | const struct flowi4 *fl4) | |
325 | { | |
326 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
327 | ||
328 | if (!in_dev) | |
329 | return htonl(INADDR_ANY); | |
330 | ||
331 | for_ifa(in_dev) { | |
ad23b750 | 332 | if (fl4->saddr == ifa->ifa_local) |
a46182b0 KC |
333 | return fl4->saddr; |
334 | } endfor_ifa(in_dev); | |
335 | ||
336 | return htonl(INADDR_ANY); | |
337 | } | |
338 | ||
4c672e4b | 339 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
1da177e4 LT |
340 | { |
341 | struct sk_buff *skb; | |
342 | struct rtable *rt; | |
343 | struct iphdr *pip; | |
344 | struct igmpv3_report *pig; | |
877acedc | 345 | struct net *net = dev_net(dev); |
31e4543d | 346 | struct flowi4 fl4; |
66088243 HX |
347 | int hlen = LL_RESERVED_SPACE(dev); |
348 | int tlen = dev->needed_tailroom; | |
4c672e4b | 349 | unsigned int size = mtu; |
1da177e4 | 350 | |
57e1ab6e | 351 | while (1) { |
66088243 | 352 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
353 | GFP_ATOMIC | __GFP_NOWARN); |
354 | if (skb) | |
355 | break; | |
356 | size >>= 1; | |
357 | if (size < 256) | |
358 | return NULL; | |
359 | } | |
9d4a0314 | 360 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 361 | |
31e4543d | 362 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
363 | 0, 0, |
364 | IPPROTO_IGMP, 0, dev->ifindex); | |
365 | if (IS_ERR(rt)) { | |
366 | kfree_skb(skb); | |
367 | return NULL; | |
1da177e4 | 368 | } |
1da177e4 | 369 | |
d8d1f30b | 370 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
371 | skb->dev = dev; |
372 | ||
66088243 | 373 | skb_reserve(skb, hlen); |
1837b2e2 | 374 | skb_tailroom_reserve(skb, mtu, tlen); |
1da177e4 | 375 | |
7e28ecc2 | 376 | skb_reset_network_header(skb); |
eddc9ec5 | 377 | pip = ip_hdr(skb); |
7e28ecc2 | 378 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
379 | |
380 | pip->version = 4; | |
381 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
382 | pip->tos = 0xc0; | |
383 | pip->frag_off = htons(IP_DF); | |
384 | pip->ttl = 1; | |
492f64ce | 385 | pip->daddr = fl4.daddr; |
e7aadb27 ED |
386 | |
387 | rcu_read_lock(); | |
a46182b0 | 388 | pip->saddr = igmpv3_get_srcaddr(dev, &fl4); |
e7aadb27 ED |
389 | rcu_read_unlock(); |
390 | ||
1da177e4 LT |
391 | pip->protocol = IPPROTO_IGMP; |
392 | pip->tot_len = 0; /* filled in later */ | |
b6a7719a | 393 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
394 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
395 | ((u8 *)&pip[1])[1] = 4; | |
396 | ((u8 *)&pip[1])[2] = 0; | |
397 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 398 | |
b0e380b1 | 399 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 400 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 401 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
402 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
403 | pig->resv1 = 0; | |
404 | pig->csum = 0; | |
405 | pig->resv2 = 0; | |
406 | pig->ngrec = 0; | |
407 | return skb; | |
408 | } | |
409 | ||
410 | static int igmpv3_sendpack(struct sk_buff *skb) | |
411 | { | |
d9edf9e2 | 412 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 413 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 414 | |
d9edf9e2 | 415 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 416 | |
33224b16 | 417 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
1da177e4 LT |
418 | } |
419 | ||
420 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
421 | { | |
a7e9ff73 | 422 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
423 | } |
424 | ||
425 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
b5476022 | 426 | int type, struct igmpv3_grec **ppgr, unsigned int mtu) |
1da177e4 LT |
427 | { |
428 | struct net_device *dev = pmc->interface->dev; | |
429 | struct igmpv3_report *pih; | |
430 | struct igmpv3_grec *pgr; | |
431 | ||
b5476022 ED |
432 | if (!skb) { |
433 | skb = igmpv3_newpack(dev, mtu); | |
434 | if (!skb) | |
435 | return NULL; | |
436 | } | |
4df864c1 | 437 | pgr = skb_put(skb, sizeof(struct igmpv3_grec)); |
1da177e4 LT |
438 | pgr->grec_type = type; |
439 | pgr->grec_auxwords = 0; | |
440 | pgr->grec_nsrcs = 0; | |
441 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 442 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
443 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
444 | *ppgr = pgr; | |
445 | return skb; | |
446 | } | |
447 | ||
4c672e4b | 448 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
449 | |
450 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
451 | int type, int gdeleted, int sdeleted) | |
452 | { | |
453 | struct net_device *dev = pmc->interface->dev; | |
87a8a2ae | 454 | struct net *net = dev_net(dev); |
1da177e4 LT |
455 | struct igmpv3_report *pih; |
456 | struct igmpv3_grec *pgr = NULL; | |
457 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 458 | int scount, stotal, first, isquery, truncate; |
b5476022 | 459 | unsigned int mtu; |
1da177e4 LT |
460 | |
461 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
462 | return skb; | |
87a8a2ae | 463 | if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 464 | return skb; |
1da177e4 | 465 | |
b5476022 ED |
466 | mtu = READ_ONCE(dev->mtu); |
467 | if (mtu < IPV4_MIN_MTU) | |
468 | return skb; | |
469 | ||
1da177e4 LT |
470 | isquery = type == IGMPV3_MODE_IS_INCLUDE || |
471 | type == IGMPV3_MODE_IS_EXCLUDE; | |
472 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
473 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
474 | ||
ad12583f DS |
475 | stotal = scount = 0; |
476 | ||
1da177e4 LT |
477 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
478 | ||
ad12583f DS |
479 | if (!*psf_list) |
480 | goto empty_source; | |
481 | ||
d9edf9e2 | 482 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
483 | |
484 | /* EX and TO_EX get a fresh packet, if needed */ | |
485 | if (truncate) { | |
486 | if (pih && pih->ngrec && | |
487 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
488 | if (skb) | |
489 | igmpv3_sendpack(skb); | |
b5476022 | 490 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
491 | } |
492 | } | |
493 | first = 1; | |
1da177e4 | 494 | psf_prev = NULL; |
c71151f0 | 495 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 496 | __be32 *psrc; |
1da177e4 LT |
497 | |
498 | psf_next = psf->sf_next; | |
499 | ||
500 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
501 | psf_prev = psf; | |
502 | continue; | |
503 | } | |
504 | ||
a052517a HL |
505 | /* Based on RFC3376 5.1. Should not send source-list change |
506 | * records when there is a filter mode change. | |
507 | */ | |
508 | if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || | |
509 | (!gdeleted && pmc->crcount)) && | |
510 | (type == IGMPV3_ALLOW_NEW_SOURCES || | |
511 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) | |
512 | goto decrease_sf_crcount; | |
513 | ||
1da177e4 LT |
514 | /* clear marks on query responses */ |
515 | if (isquery) | |
516 | psf->sf_gsresp = 0; | |
517 | ||
63007727 | 518 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
519 | first*sizeof(struct igmpv3_grec)) { |
520 | if (truncate && !first) | |
521 | break; /* truncate these */ | |
522 | if (pgr) | |
523 | pgr->grec_nsrcs = htons(scount); | |
524 | if (skb) | |
525 | igmpv3_sendpack(skb); | |
b5476022 | 526 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
527 | first = 1; |
528 | scount = 0; | |
529 | } | |
530 | if (first) { | |
b5476022 | 531 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
1da177e4 LT |
532 | first = 0; |
533 | } | |
cc63f70b AD |
534 | if (!skb) |
535 | return NULL; | |
4df864c1 | 536 | psrc = skb_put(skb, sizeof(__be32)); |
1da177e4 | 537 | *psrc = psf->sf_inaddr; |
ad12583f | 538 | scount++; stotal++; |
1da177e4 LT |
539 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
540 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
a052517a | 541 | decrease_sf_crcount: |
1da177e4 LT |
542 | psf->sf_crcount--; |
543 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
544 | if (psf_prev) | |
545 | psf_prev->sf_next = psf->sf_next; | |
546 | else | |
547 | *psf_list = psf->sf_next; | |
548 | kfree(psf); | |
549 | continue; | |
550 | } | |
551 | } | |
552 | psf_prev = psf; | |
553 | } | |
ad12583f DS |
554 | |
555 | empty_source: | |
556 | if (!stotal) { | |
557 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
558 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
559 | return skb; | |
560 | if (pmc->crcount || isquery) { | |
561 | /* make sure we have room for group header */ | |
c71151f0 | 562 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
563 | igmpv3_sendpack(skb); |
564 | skb = NULL; /* add_grhead will get a new one */ | |
565 | } | |
b5476022 | 566 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
ad12583f DS |
567 | } |
568 | } | |
1da177e4 LT |
569 | if (pgr) |
570 | pgr->grec_nsrcs = htons(scount); | |
571 | ||
572 | if (isquery) | |
573 | pmc->gsquery = 0; /* clear query state on report */ | |
574 | return skb; | |
575 | } | |
576 | ||
577 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
578 | { | |
579 | struct sk_buff *skb = NULL; | |
87a8a2ae | 580 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
581 | int type; |
582 | ||
583 | if (!pmc) { | |
1d7138de ED |
584 | rcu_read_lock(); |
585 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
586 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
587 | continue; | |
df2cf4a7 | 588 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
87a8a2ae | 589 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 590 | continue; |
1da177e4 LT |
591 | spin_lock_bh(&pmc->lock); |
592 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
593 | type = IGMPV3_MODE_IS_EXCLUDE; | |
594 | else | |
595 | type = IGMPV3_MODE_IS_INCLUDE; | |
596 | skb = add_grec(skb, pmc, type, 0, 0); | |
597 | spin_unlock_bh(&pmc->lock); | |
598 | } | |
1d7138de | 599 | rcu_read_unlock(); |
1da177e4 LT |
600 | } else { |
601 | spin_lock_bh(&pmc->lock); | |
602 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
603 | type = IGMPV3_MODE_IS_EXCLUDE; | |
604 | else | |
605 | type = IGMPV3_MODE_IS_INCLUDE; | |
606 | skb = add_grec(skb, pmc, type, 0, 0); | |
607 | spin_unlock_bh(&pmc->lock); | |
608 | } | |
609 | if (!skb) | |
610 | return 0; | |
611 | return igmpv3_sendpack(skb); | |
612 | } | |
613 | ||
614 | /* | |
615 | * remove zero-count source records from a source filter list | |
616 | */ | |
617 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
618 | { | |
619 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
620 | ||
621 | psf_prev = NULL; | |
c71151f0 | 622 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
623 | psf_next = psf->sf_next; |
624 | if (psf->sf_crcount == 0) { | |
625 | if (psf_prev) | |
626 | psf_prev->sf_next = psf->sf_next; | |
627 | else | |
628 | *ppsf = psf->sf_next; | |
629 | kfree(psf); | |
630 | } else | |
631 | psf_prev = psf; | |
632 | } | |
633 | } | |
634 | ||
635 | static void igmpv3_send_cr(struct in_device *in_dev) | |
636 | { | |
637 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
638 | struct sk_buff *skb = NULL; | |
639 | int type, dtype; | |
640 | ||
1d7138de | 641 | rcu_read_lock(); |
1da177e4 LT |
642 | spin_lock_bh(&in_dev->mc_tomb_lock); |
643 | ||
644 | /* deleted MCA's */ | |
645 | pmc_prev = NULL; | |
c71151f0 | 646 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
647 | pmc_next = pmc->next; |
648 | if (pmc->sfmode == MCAST_INCLUDE) { | |
649 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
650 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
651 | skb = add_grec(skb, pmc, type, 1, 0); | |
652 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
653 | } | |
654 | if (pmc->crcount) { | |
1da177e4 LT |
655 | if (pmc->sfmode == MCAST_EXCLUDE) { |
656 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
657 | skb = add_grec(skb, pmc, type, 1, 0); | |
658 | } | |
ad12583f | 659 | pmc->crcount--; |
1da177e4 LT |
660 | if (pmc->crcount == 0) { |
661 | igmpv3_clear_zeros(&pmc->tomb); | |
662 | igmpv3_clear_zeros(&pmc->sources); | |
663 | } | |
664 | } | |
665 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
666 | if (pmc_prev) | |
667 | pmc_prev->next = pmc_next; | |
668 | else | |
669 | in_dev->mc_tomb = pmc_next; | |
670 | in_dev_put(pmc->interface); | |
671 | kfree(pmc); | |
672 | } else | |
673 | pmc_prev = pmc; | |
674 | } | |
675 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
676 | ||
677 | /* change recs */ | |
1d7138de | 678 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
679 | spin_lock_bh(&pmc->lock); |
680 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
681 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
682 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
683 | } else { | |
684 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
685 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
686 | } | |
687 | skb = add_grec(skb, pmc, type, 0, 0); | |
688 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
689 | ||
690 | /* filter mode changes */ | |
691 | if (pmc->crcount) { | |
1da177e4 LT |
692 | if (pmc->sfmode == MCAST_EXCLUDE) |
693 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
694 | else | |
695 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
696 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 697 | pmc->crcount--; |
1da177e4 LT |
698 | } |
699 | spin_unlock_bh(&pmc->lock); | |
700 | } | |
1d7138de | 701 | rcu_read_unlock(); |
1da177e4 LT |
702 | |
703 | if (!skb) | |
704 | return; | |
705 | (void) igmpv3_sendpack(skb); | |
706 | } | |
707 | ||
708 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
709 | int type) | |
710 | { | |
711 | struct sk_buff *skb; | |
712 | struct iphdr *iph; | |
713 | struct igmphdr *ih; | |
714 | struct rtable *rt; | |
715 | struct net_device *dev = in_dev->dev; | |
877acedc | 716 | struct net *net = dev_net(dev); |
63007727 | 717 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 718 | struct flowi4 fl4; |
63007727 | 719 | __be32 dst; |
66088243 | 720 | int hlen, tlen; |
1da177e4 LT |
721 | |
722 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
723 | return igmpv3_send_report(in_dev, pmc); | |
df2cf4a7 | 724 | |
87a8a2ae | 725 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 PD |
726 | return 0; |
727 | ||
728 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
1da177e4 LT |
729 | dst = IGMP_ALL_ROUTER; |
730 | else | |
731 | dst = group; | |
732 | ||
31e4543d | 733 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
734 | 0, 0, |
735 | IPPROTO_IGMP, 0, dev->ifindex); | |
736 | if (IS_ERR(rt)) | |
737 | return -1; | |
738 | ||
66088243 HX |
739 | hlen = LL_RESERVED_SPACE(dev); |
740 | tlen = dev->needed_tailroom; | |
741 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
51456b29 | 742 | if (!skb) { |
1da177e4 LT |
743 | ip_rt_put(rt); |
744 | return -1; | |
745 | } | |
9d4a0314 | 746 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 747 | |
d8d1f30b | 748 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 749 | |
66088243 | 750 | skb_reserve(skb, hlen); |
1da177e4 | 751 | |
7e28ecc2 | 752 | skb_reset_network_header(skb); |
eddc9ec5 | 753 | iph = ip_hdr(skb); |
7e28ecc2 | 754 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
755 | |
756 | iph->version = 4; | |
757 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
758 | iph->tos = 0xc0; | |
759 | iph->frag_off = htons(IP_DF); | |
760 | iph->ttl = 1; | |
761 | iph->daddr = dst; | |
492f64ce | 762 | iph->saddr = fl4.saddr; |
1da177e4 | 763 | iph->protocol = IPPROTO_IGMP; |
b6a7719a | 764 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
765 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
766 | ((u8 *)&iph[1])[1] = 4; | |
767 | ((u8 *)&iph[1])[2] = 0; | |
768 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 | 769 | |
4df864c1 | 770 | ih = skb_put(skb, sizeof(struct igmphdr)); |
a7e9ff73 JK |
771 | ih->type = type; |
772 | ih->code = 0; | |
773 | ih->csum = 0; | |
774 | ih->group = group; | |
775 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 776 | |
33224b16 | 777 | return ip_local_out(net, skb->sk, skb); |
1da177e4 LT |
778 | } |
779 | ||
e99e88a9 | 780 | static void igmp_gq_timer_expire(struct timer_list *t) |
1da177e4 | 781 | { |
e99e88a9 | 782 | struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer); |
1da177e4 LT |
783 | |
784 | in_dev->mr_gq_running = 0; | |
785 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 786 | in_dev_put(in_dev); |
1da177e4 LT |
787 | } |
788 | ||
e99e88a9 | 789 | static void igmp_ifc_timer_expire(struct timer_list *t) |
1da177e4 | 790 | { |
e99e88a9 | 791 | struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer); |
1da177e4 LT |
792 | |
793 | igmpv3_send_cr(in_dev); | |
794 | if (in_dev->mr_ifc_count) { | |
795 | in_dev->mr_ifc_count--; | |
cab70040 WM |
796 | igmp_ifc_start_timer(in_dev, |
797 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 798 | } |
e2401654 | 799 | in_dev_put(in_dev); |
1da177e4 LT |
800 | } |
801 | ||
802 | static void igmp_ifc_event(struct in_device *in_dev) | |
803 | { | |
165094af | 804 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
805 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
806 | return; | |
165094af | 807 | in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
808 | igmp_ifc_start_timer(in_dev, 1); |
809 | } | |
810 | ||
811 | ||
e99e88a9 | 812 | static void igmp_timer_expire(struct timer_list *t) |
1da177e4 | 813 | { |
e99e88a9 | 814 | struct ip_mc_list *im = from_timer(im, t, timer); |
1da177e4 LT |
815 | struct in_device *in_dev = im->interface; |
816 | ||
817 | spin_lock(&im->lock); | |
a7e9ff73 | 818 | im->tm_running = 0; |
1da177e4 | 819 | |
4fb7253e | 820 | if (im->unsolicit_count && --im->unsolicit_count) |
cab70040 | 821 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
4fb7253e | 822 | |
1da177e4 LT |
823 | im->reporter = 1; |
824 | spin_unlock(&im->lock); | |
825 | ||
826 | if (IGMP_V1_SEEN(in_dev)) | |
827 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
828 | else if (IGMP_V2_SEEN(in_dev)) | |
829 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
830 | else | |
831 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
832 | ||
833 | ip_ma_put(im); | |
834 | } | |
835 | ||
ad12583f | 836 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 837 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
838 | { |
839 | struct ip_sf_list *psf; | |
840 | int i, scount; | |
841 | ||
ad12583f | 842 | scount = 0; |
c71151f0 | 843 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
844 | if (scount == nsrcs) |
845 | break; | |
c71151f0 | 846 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 847 | /* skip inactive filters */ |
e05c4ad3 | 848 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
849 | pmc->sfcount[MCAST_EXCLUDE] != |
850 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 851 | break; |
ad12583f DS |
852 | if (srcs[i] == psf->sf_inaddr) { |
853 | scount++; | |
854 | break; | |
855 | } | |
856 | } | |
857 | } | |
858 | pmc->gsquery = 0; | |
859 | if (scount == nsrcs) /* all sources excluded */ | |
860 | return 0; | |
861 | return 1; | |
862 | } | |
863 | ||
ea4d9e72 | 864 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
865 | { |
866 | struct ip_sf_list *psf; | |
867 | int i, scount; | |
868 | ||
869 | if (pmc->sfmode == MCAST_EXCLUDE) | |
870 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
871 | ||
872 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 873 | scount = 0; |
c71151f0 | 874 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
875 | if (scount == nsrcs) |
876 | break; | |
c71151f0 | 877 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
878 | if (srcs[i] == psf->sf_inaddr) { |
879 | psf->sf_gsresp = 1; | |
880 | scount++; | |
881 | break; | |
882 | } | |
883 | } | |
ad12583f DS |
884 | if (!scount) { |
885 | pmc->gsquery = 0; | |
886 | return 0; | |
887 | } | |
888 | pmc->gsquery = 1; | |
889 | return 1; | |
1da177e4 LT |
890 | } |
891 | ||
d679c532 ED |
892 | /* return true if packet was dropped */ |
893 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
894 | { |
895 | struct ip_mc_list *im; | |
87a8a2ae | 896 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
897 | |
898 | /* Timers are only set for non-local groups */ | |
899 | ||
900 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 901 | return false; |
87a8a2ae | 902 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 903 | return false; |
1da177e4 | 904 | |
1d7138de ED |
905 | rcu_read_lock(); |
906 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
907 | if (im->multiaddr == group) { |
908 | igmp_stop_timer(im); | |
909 | break; | |
910 | } | |
911 | } | |
1d7138de | 912 | rcu_read_unlock(); |
d679c532 | 913 | return false; |
1da177e4 LT |
914 | } |
915 | ||
d679c532 ED |
916 | /* return true if packet was dropped */ |
917 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
918 | int len) |
919 | { | |
d9edf9e2 ACM |
920 | struct igmphdr *ih = igmp_hdr(skb); |
921 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 922 | struct ip_mc_list *im; |
63007727 | 923 | __be32 group = ih->group; |
1da177e4 LT |
924 | int max_delay; |
925 | int mark = 0; | |
87a8a2ae | 926 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
927 | |
928 | ||
5b7c8406 | 929 | if (len == 8) { |
1da177e4 LT |
930 | if (ih->code == 0) { |
931 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 932 | |
436f7c20 | 933 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
1da177e4 | 934 | in_dev->mr_v1_seen = jiffies + |
966c37f2 HL |
935 | (in_dev->mr_qrv * in_dev->mr_qi) + |
936 | in_dev->mr_qri; | |
1da177e4 LT |
937 | group = 0; |
938 | } else { | |
939 | /* v2 router present */ | |
940 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
941 | in_dev->mr_v2_seen = jiffies + | |
966c37f2 HL |
942 | (in_dev->mr_qrv * in_dev->mr_qi) + |
943 | in_dev->mr_qri; | |
1da177e4 LT |
944 | } |
945 | /* cancel the interface change timer */ | |
946 | in_dev->mr_ifc_count = 0; | |
947 | if (del_timer(&in_dev->mr_ifc_timer)) | |
948 | __in_dev_put(in_dev); | |
949 | /* clear deleted report items */ | |
950 | igmpv3_clear_delrec(in_dev); | |
951 | } else if (len < 12) { | |
d679c532 | 952 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
953 | } else if (IGMP_V1_SEEN(in_dev)) { |
954 | /* This is a v3 query with v1 queriers present */ | |
436f7c20 | 955 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
5b7c8406 DS |
956 | group = 0; |
957 | } else if (IGMP_V2_SEEN(in_dev)) { | |
958 | /* this is a v3 query with v2 queriers present; | |
959 | * Interpretation of the max_delay code is problematic here. | |
960 | * A real v2 host would use ih_code directly, while v3 has a | |
961 | * different encoding. We use the v3 encoding as more likely | |
962 | * to be intended in a v3 query. | |
963 | */ | |
964 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
965 | if (!max_delay) |
966 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
967 | } else { /* v3 */ |
968 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 969 | return true; |
e905a9ed | 970 | |
d9edf9e2 | 971 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 972 | if (ih3->nsrcs) { |
e905a9ed | 973 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 974 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 975 | return true; |
d9edf9e2 | 976 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
977 | } |
978 | ||
979 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
980 | if (!max_delay) | |
981 | max_delay = 1; /* can't mod w/ 0 */ | |
982 | in_dev->mr_maxdelay = max_delay; | |
966c37f2 HL |
983 | |
984 | /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently | |
985 | * received value was zero, use the default or statically | |
986 | * configured value. | |
987 | */ | |
988 | in_dev->mr_qrv = ih3->qrv ?: net->ipv4.sysctl_igmp_qrv; | |
989 | in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL; | |
990 | ||
991 | /* RFC3376, 8.3. Query Response Interval: | |
992 | * The number of seconds represented by the [Query Response | |
993 | * Interval] must be less than the [Query Interval]. | |
994 | */ | |
995 | if (in_dev->mr_qri >= in_dev->mr_qi) | |
996 | in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ; | |
997 | ||
1da177e4 LT |
998 | if (!group) { /* general query */ |
999 | if (ih3->nsrcs) | |
b47bd8d2 | 1000 | return true; /* no sources allowed */ |
1da177e4 | 1001 | igmp_gq_start_timer(in_dev); |
d679c532 | 1002 | return false; |
1da177e4 LT |
1003 | } |
1004 | /* mark sources to include, if group & source-specific */ | |
1005 | mark = ih3->nsrcs != 0; | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * - Start the timers in all of our membership records | |
1010 | * that the query applies to for the interface on | |
1011 | * which the query arrived excl. those that belong | |
1012 | * to a "local" group (224.0.0.X) | |
1013 | * - For timers already running check if they need to | |
1014 | * be reset. | |
1015 | * - Use the igmp->igmp_code field as the maximum | |
1016 | * delay possible | |
1017 | */ | |
1d7138de ED |
1018 | rcu_read_lock(); |
1019 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
1020 | int changed; |
1021 | ||
1da177e4 LT |
1022 | if (group && group != im->multiaddr) |
1023 | continue; | |
1024 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1025 | continue; | |
df2cf4a7 | 1026 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1027 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1028 | continue; |
1da177e4 LT |
1029 | spin_lock_bh(&im->lock); |
1030 | if (im->tm_running) | |
1031 | im->gsquery = im->gsquery && mark; | |
1032 | else | |
1033 | im->gsquery = mark; | |
ad12583f | 1034 | changed = !im->gsquery || |
e905a9ed | 1035 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 1036 | spin_unlock_bh(&im->lock); |
ad12583f DS |
1037 | if (changed) |
1038 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 1039 | } |
1d7138de | 1040 | rcu_read_unlock(); |
d679c532 | 1041 | return false; |
1da177e4 LT |
1042 | } |
1043 | ||
9a57a9d2 | 1044 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
1045 | int igmp_rcv(struct sk_buff *skb) |
1046 | { | |
1047 | /* This basically follows the spec line by line -- see RFC1112 */ | |
1048 | struct igmphdr *ih; | |
c7b725be DA |
1049 | struct net_device *dev = skb->dev; |
1050 | struct in_device *in_dev; | |
1da177e4 | 1051 | int len = skb->len; |
d679c532 | 1052 | bool dropped = true; |
1da177e4 | 1053 | |
c7b725be DA |
1054 | if (netif_is_l3_master(dev)) { |
1055 | dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif); | |
1056 | if (!dev) | |
1057 | goto drop; | |
1058 | } | |
1059 | ||
1060 | in_dev = __in_dev_get_rcu(dev); | |
51456b29 | 1061 | if (!in_dev) |
cd557bc1 | 1062 | goto drop; |
1da177e4 | 1063 | |
fb286bb2 | 1064 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 1065 | goto drop; |
fb286bb2 | 1066 | |
de08dc1a TH |
1067 | if (skb_checksum_simple_validate(skb)) |
1068 | goto drop; | |
1da177e4 | 1069 | |
d9edf9e2 | 1070 | ih = igmp_hdr(skb); |
1da177e4 LT |
1071 | switch (ih->type) { |
1072 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 1073 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
1074 | break; |
1075 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1076 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 1077 | /* Is it our report looped back? */ |
c7537967 | 1078 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1079 | break; |
24c69275 DS |
1080 | /* don't rely on MC router hearing unicast reports */ |
1081 | if (skb->pkt_type == PACKET_MULTICAST || | |
1082 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1083 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1084 | break; |
1085 | case IGMP_PIM: | |
1086 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1087 | return pim_rcv_v1(skb); |
1088 | #endif | |
c6b471e6 | 1089 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1090 | case IGMP_DVMRP: |
1091 | case IGMP_TRACE: | |
1092 | case IGMP_HOST_LEAVE_MESSAGE: | |
1093 | case IGMP_MTRACE: | |
1094 | case IGMP_MTRACE_RESP: | |
1095 | break; | |
1096 | default: | |
dd1c1853 | 1097 | break; |
1da177e4 | 1098 | } |
fb286bb2 | 1099 | |
cd557bc1 | 1100 | drop: |
d679c532 ED |
1101 | if (dropped) |
1102 | kfree_skb(skb); | |
1103 | else | |
1104 | consume_skb(skb); | |
1da177e4 LT |
1105 | return 0; |
1106 | } | |
1107 | ||
1108 | #endif | |
1109 | ||
1110 | ||
1111 | /* | |
1112 | * Add a filter to a device | |
1113 | */ | |
1114 | ||
63007727 | 1115 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1116 | { |
1117 | char buf[MAX_ADDR_LEN]; | |
1118 | struct net_device *dev = in_dev->dev; | |
1119 | ||
1120 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1121 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1122 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1123 | routine. Something sort of: |
1124 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1125 | --ANK | |
1126 | */ | |
1127 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1128 | dev_mc_add(dev, buf); |
1da177e4 LT |
1129 | } |
1130 | ||
1131 | /* | |
1132 | * Remove a filter from a device | |
1133 | */ | |
1134 | ||
63007727 | 1135 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1136 | { |
1137 | char buf[MAX_ADDR_LEN]; | |
1138 | struct net_device *dev = in_dev->dev; | |
1139 | ||
1140 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1141 | dev_mc_del(dev, buf); |
1da177e4 LT |
1142 | } |
1143 | ||
1144 | #ifdef CONFIG_IP_MULTICAST | |
1145 | /* | |
1146 | * deleted ip_mc_list manipulation | |
1147 | */ | |
1148 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1149 | { | |
1150 | struct ip_mc_list *pmc; | |
165094af | 1151 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1152 | |
1153 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1154 | * are actually used. In particular, the refcnt and users are not | |
1155 | * used for management of the delete list. Using the same structure | |
1156 | * for deleted items allows change reports to use common code with | |
1157 | * non-deleted or query-response MCA's. | |
1158 | */ | |
0da974f4 | 1159 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1160 | if (!pmc) |
1161 | return; | |
b4846fc3 | 1162 | spin_lock_init(&pmc->lock); |
1da177e4 LT |
1163 | spin_lock_bh(&im->lock); |
1164 | pmc->interface = im->interface; | |
1165 | in_dev_hold(in_dev); | |
1166 | pmc->multiaddr = im->multiaddr; | |
165094af | 1167 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1168 | pmc->sfmode = im->sfmode; |
1169 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1170 | struct ip_sf_list *psf; | |
1171 | ||
1172 | pmc->tomb = im->tomb; | |
1173 | pmc->sources = im->sources; | |
1174 | im->tomb = im->sources = NULL; | |
c71151f0 | 1175 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1176 | psf->sf_crcount = pmc->crcount; |
1177 | } | |
1178 | spin_unlock_bh(&im->lock); | |
1179 | ||
1180 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1181 | pmc->next = in_dev->mc_tomb; | |
1182 | in_dev->mc_tomb = pmc; | |
1183 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1184 | } | |
1185 | ||
24803f38 HL |
1186 | /* |
1187 | * restore ip_mc_list deleted records | |
1188 | */ | |
1189 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1da177e4 LT |
1190 | { |
1191 | struct ip_mc_list *pmc, *pmc_prev; | |
24803f38 HL |
1192 | struct ip_sf_list *psf; |
1193 | struct net *net = dev_net(in_dev->dev); | |
1194 | __be32 multiaddr = im->multiaddr; | |
1da177e4 LT |
1195 | |
1196 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1197 | pmc_prev = NULL; | |
c71151f0 | 1198 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1199 | if (pmc->multiaddr == multiaddr) |
1200 | break; | |
1201 | pmc_prev = pmc; | |
1202 | } | |
1203 | if (pmc) { | |
1204 | if (pmc_prev) | |
1205 | pmc_prev->next = pmc->next; | |
1206 | else | |
1207 | in_dev->mc_tomb = pmc->next; | |
1208 | } | |
1209 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
24803f38 HL |
1210 | |
1211 | spin_lock_bh(&im->lock); | |
1da177e4 | 1212 | if (pmc) { |
24803f38 | 1213 | im->interface = pmc->interface; |
08d3ffcc | 1214 | if (im->sfmode == MCAST_INCLUDE) { |
24803f38 HL |
1215 | im->tomb = pmc->tomb; |
1216 | im->sources = pmc->sources; | |
1217 | for (psf = im->sources; psf; psf = psf->sf_next) | |
6e2059b5 HL |
1218 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1219 | } else { | |
1220 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1da177e4 LT |
1221 | } |
1222 | in_dev_put(pmc->interface); | |
9c8bb163 | 1223 | kfree(pmc); |
1da177e4 | 1224 | } |
24803f38 | 1225 | spin_unlock_bh(&im->lock); |
1da177e4 LT |
1226 | } |
1227 | ||
24803f38 HL |
1228 | /* |
1229 | * flush ip_mc_list deleted records | |
1230 | */ | |
1da177e4 LT |
1231 | static void igmpv3_clear_delrec(struct in_device *in_dev) |
1232 | { | |
1233 | struct ip_mc_list *pmc, *nextpmc; | |
1234 | ||
1235 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1236 | pmc = in_dev->mc_tomb; | |
1237 | in_dev->mc_tomb = NULL; | |
1238 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1239 | ||
1240 | for (; pmc; pmc = nextpmc) { | |
1241 | nextpmc = pmc->next; | |
1242 | ip_mc_clear_src(pmc); | |
1243 | in_dev_put(pmc->interface); | |
1244 | kfree(pmc); | |
1245 | } | |
1246 | /* clear dead sources, too */ | |
1d7138de ED |
1247 | rcu_read_lock(); |
1248 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1249 | struct ip_sf_list *psf, *psf_next; |
1250 | ||
1251 | spin_lock_bh(&pmc->lock); | |
1252 | psf = pmc->tomb; | |
1253 | pmc->tomb = NULL; | |
1254 | spin_unlock_bh(&pmc->lock); | |
c71151f0 | 1255 | for (; psf; psf = psf_next) { |
1da177e4 LT |
1256 | psf_next = psf->sf_next; |
1257 | kfree(psf); | |
1258 | } | |
1259 | } | |
1d7138de | 1260 | rcu_read_unlock(); |
1da177e4 LT |
1261 | } |
1262 | #endif | |
1263 | ||
1264 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1265 | { | |
1266 | struct in_device *in_dev = im->interface; | |
1267 | #ifdef CONFIG_IP_MULTICAST | |
87a8a2ae | 1268 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1269 | int reporter; |
1270 | #endif | |
1271 | ||
1272 | if (im->loaded) { | |
1273 | im->loaded = 0; | |
1274 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1275 | } | |
1276 | ||
1277 | #ifdef CONFIG_IP_MULTICAST | |
1278 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1279 | return; | |
87a8a2ae | 1280 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1281 | return; |
1da177e4 LT |
1282 | |
1283 | reporter = im->reporter; | |
1284 | igmp_stop_timer(im); | |
1285 | ||
1286 | if (!in_dev->dead) { | |
1287 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1288 | return; |
1da177e4 LT |
1289 | if (IGMP_V2_SEEN(in_dev)) { |
1290 | if (reporter) | |
1291 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1292 | return; |
1da177e4 LT |
1293 | } |
1294 | /* IGMPv3 */ | |
1295 | igmpv3_add_delrec(in_dev, im); | |
1296 | ||
1297 | igmp_ifc_event(in_dev); | |
1298 | } | |
1da177e4 | 1299 | #endif |
1da177e4 LT |
1300 | } |
1301 | ||
0ae0d60a | 1302 | static void igmp_group_added(struct ip_mc_list *im) |
1da177e4 LT |
1303 | { |
1304 | struct in_device *in_dev = im->interface; | |
dcd87999 | 1305 | #ifdef CONFIG_IP_MULTICAST |
87a8a2ae | 1306 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1307 | #endif |
1da177e4 LT |
1308 | |
1309 | if (im->loaded == 0) { | |
1310 | im->loaded = 1; | |
1311 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1312 | } | |
1313 | ||
1314 | #ifdef CONFIG_IP_MULTICAST | |
1315 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1316 | return; | |
87a8a2ae | 1317 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1318 | return; |
1da177e4 LT |
1319 | |
1320 | if (in_dev->dead) | |
1321 | return; | |
ff06525f HL |
1322 | |
1323 | im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; | |
1da177e4 LT |
1324 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { |
1325 | spin_lock_bh(&im->lock); | |
436f7c20 | 1326 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); |
1da177e4 LT |
1327 | spin_unlock_bh(&im->lock); |
1328 | return; | |
1329 | } | |
1330 | /* else, v3 */ | |
1331 | ||
6e2059b5 HL |
1332 | /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should |
1333 | * not send filter-mode change record as the mode should be from | |
1334 | * IN() to IN(A). | |
1335 | */ | |
0ae0d60a | 1336 | if (im->sfmode == MCAST_EXCLUDE) |
6e2059b5 HL |
1337 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1338 | ||
1da177e4 LT |
1339 | igmp_ifc_event(in_dev); |
1340 | #endif | |
1341 | } | |
1342 | ||
1343 | ||
1344 | /* | |
1345 | * Multicast list managers | |
1346 | */ | |
1347 | ||
e9897071 ED |
1348 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1349 | { | |
c70eba74 | 1350 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1351 | } |
1352 | ||
1353 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1354 | struct ip_mc_list *im) | |
1355 | { | |
1356 | struct ip_mc_list __rcu **mc_hash; | |
1357 | u32 hash; | |
1358 | ||
1359 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1360 | if (mc_hash) { | |
1361 | hash = ip_mc_hash(im); | |
c70eba74 | 1362 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1363 | rcu_assign_pointer(mc_hash[hash], im); |
1364 | return; | |
1365 | } | |
1366 | ||
1367 | /* do not use a hash table for small number of items */ | |
1368 | if (in_dev->mc_count < 4) | |
1369 | return; | |
1370 | ||
1371 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1372 | GFP_KERNEL); | |
1373 | if (!mc_hash) | |
1374 | return; | |
1375 | ||
1376 | for_each_pmc_rtnl(in_dev, im) { | |
1377 | hash = ip_mc_hash(im); | |
c70eba74 | 1378 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1379 | RCU_INIT_POINTER(mc_hash[hash], im); |
1380 | } | |
1381 | ||
1382 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1383 | } | |
1384 | ||
1385 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1386 | struct ip_mc_list *im) | |
1387 | { | |
1388 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1389 | struct ip_mc_list *aux; | |
1390 | ||
1391 | if (!mc_hash) | |
1392 | return; | |
1393 | mc_hash += ip_mc_hash(im); | |
1394 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1395 | mc_hash = &aux->next_hash; | |
1396 | *mc_hash = im->next_hash; | |
1397 | } | |
1398 | ||
1da177e4 LT |
1399 | |
1400 | /* | |
1401 | * A socket has joined a multicast group on device dev. | |
1402 | */ | |
b87bac10 WY |
1403 | static void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, |
1404 | unsigned int mode) | |
1da177e4 LT |
1405 | { |
1406 | struct ip_mc_list *im; | |
1407 | ||
1408 | ASSERT_RTNL(); | |
1409 | ||
1d7138de | 1410 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1411 | if (im->multiaddr == addr) { |
1412 | im->users++; | |
6e2059b5 | 1413 | ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0); |
1da177e4 LT |
1414 | goto out; |
1415 | } | |
1416 | } | |
1417 | ||
1d7138de | 1418 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1419 | if (!im) |
1420 | goto out; | |
1421 | ||
a7e9ff73 JK |
1422 | im->users = 1; |
1423 | im->interface = in_dev; | |
1da177e4 | 1424 | in_dev_hold(in_dev); |
a7e9ff73 | 1425 | im->multiaddr = addr; |
1da177e4 | 1426 | /* initial mode is (EX, empty) */ |
6e2059b5 HL |
1427 | im->sfmode = mode; |
1428 | im->sfcount[mode] = 1; | |
8851ab52 | 1429 | refcount_set(&im->refcnt, 1); |
1da177e4 LT |
1430 | spin_lock_init(&im->lock); |
1431 | #ifdef CONFIG_IP_MULTICAST | |
e99e88a9 | 1432 | timer_setup(&im->timer, igmp_timer_expire, 0); |
1da177e4 | 1433 | #endif |
1d7138de ED |
1434 | |
1435 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1436 | in_dev->mc_count++; |
cf778b00 | 1437 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1438 | |
e9897071 ED |
1439 | ip_mc_hash_add(in_dev, im); |
1440 | ||
1da177e4 | 1441 | #ifdef CONFIG_IP_MULTICAST |
24803f38 | 1442 | igmpv3_del_delrec(in_dev, im); |
1da177e4 | 1443 | #endif |
0ae0d60a | 1444 | igmp_group_added(im); |
1da177e4 LT |
1445 | if (!in_dev->dead) |
1446 | ip_rt_multicast_event(in_dev); | |
1447 | out: | |
1448 | return; | |
1449 | } | |
6e2059b5 HL |
1450 | |
1451 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) | |
1452 | { | |
1453 | __ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE); | |
1454 | } | |
4bc2f18b | 1455 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1456 | |
9afd85c9 LL |
1457 | static int ip_mc_check_iphdr(struct sk_buff *skb) |
1458 | { | |
1459 | const struct iphdr *iph; | |
1460 | unsigned int len; | |
1461 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1462 | ||
1463 | if (!pskb_may_pull(skb, offset)) | |
1464 | return -EINVAL; | |
1465 | ||
1466 | iph = ip_hdr(skb); | |
1467 | ||
1468 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1469 | return -EINVAL; | |
1470 | ||
1471 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1472 | ||
1473 | if (!pskb_may_pull(skb, offset)) | |
1474 | return -EINVAL; | |
1475 | ||
1476 | iph = ip_hdr(skb); | |
1477 | ||
1478 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1479 | return -EINVAL; | |
1480 | ||
1481 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1482 | if (skb->len < len || len < offset) | |
1483 | return -EINVAL; | |
1484 | ||
1485 | skb_set_transport_header(skb, offset); | |
1486 | ||
1487 | return 0; | |
1488 | } | |
1489 | ||
1490 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1491 | { | |
1492 | unsigned int len = skb_transport_offset(skb); | |
1493 | ||
1494 | len += sizeof(struct igmpv3_report); | |
1495 | ||
1496 | return pskb_may_pull(skb, len) ? 0 : -EINVAL; | |
1497 | } | |
1498 | ||
1499 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1500 | { | |
1501 | unsigned int len = skb_transport_offset(skb); | |
1502 | ||
1503 | len += sizeof(struct igmphdr); | |
1504 | if (skb->len < len) | |
1505 | return -EINVAL; | |
1506 | ||
1507 | /* IGMPv{1,2}? */ | |
1508 | if (skb->len != len) { | |
1509 | /* or IGMPv3? */ | |
1510 | len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); | |
1511 | if (skb->len < len || !pskb_may_pull(skb, len)) | |
1512 | return -EINVAL; | |
1513 | } | |
1514 | ||
1515 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1516 | * all-systems destination addresses (224.0.0.1) for general queries | |
1517 | */ | |
1518 | if (!igmp_hdr(skb)->group && | |
1519 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1520 | return -EINVAL; | |
1521 | ||
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1526 | { | |
1527 | switch (igmp_hdr(skb)->type) { | |
1528 | case IGMP_HOST_LEAVE_MESSAGE: | |
1529 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1530 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1531 | /* fall through */ | |
1532 | return 0; | |
1533 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1534 | return ip_mc_check_igmp_reportv3(skb); | |
1535 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1536 | return ip_mc_check_igmp_query(skb); | |
1537 | default: | |
1538 | return -ENOMSG; | |
1539 | } | |
1540 | } | |
1541 | ||
1542 | static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) | |
1543 | { | |
1544 | return skb_checksum_simple_validate(skb); | |
1545 | } | |
1546 | ||
1547 | static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1548 | ||
1549 | { | |
1550 | struct sk_buff *skb_chk; | |
1551 | unsigned int transport_len; | |
1552 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); | |
a516993f | 1553 | int ret = -EINVAL; |
9afd85c9 LL |
1554 | |
1555 | transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); | |
1556 | ||
9afd85c9 LL |
1557 | skb_chk = skb_checksum_trimmed(skb, transport_len, |
1558 | ip_mc_validate_checksum); | |
1559 | if (!skb_chk) | |
a516993f | 1560 | goto err; |
9afd85c9 | 1561 | |
a516993f LL |
1562 | if (!pskb_may_pull(skb_chk, len)) |
1563 | goto err; | |
9afd85c9 LL |
1564 | |
1565 | ret = ip_mc_check_igmp_msg(skb_chk); | |
a516993f LL |
1566 | if (ret) |
1567 | goto err; | |
9afd85c9 LL |
1568 | |
1569 | if (skb_trimmed) | |
1570 | *skb_trimmed = skb_chk; | |
a516993f LL |
1571 | /* free now unneeded clone */ |
1572 | else if (skb_chk != skb) | |
9afd85c9 LL |
1573 | kfree_skb(skb_chk); |
1574 | ||
a516993f LL |
1575 | ret = 0; |
1576 | ||
1577 | err: | |
1578 | if (ret && skb_chk && skb_chk != skb) | |
1579 | kfree_skb(skb_chk); | |
1580 | ||
1581 | return ret; | |
9afd85c9 LL |
1582 | } |
1583 | ||
1584 | /** | |
1585 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1586 | * @skb: the skb to validate | |
1587 | * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) | |
1588 | * | |
1589 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
a516993f | 1590 | * skb transport header accordingly and returns zero. |
9afd85c9 LL |
1591 | * |
1592 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1593 | * standard | |
1594 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1595 | * -ENOMEM: A memory allocation failure happened. | |
1596 | * | |
1597 | * Optionally, an skb pointer might be provided via skb_trimmed (or set it | |
1598 | * to NULL): After parsing an IGMP packet successfully it will point to | |
1599 | * an skb which has its tail aligned to the IP packet end. This might | |
1600 | * either be the originally provided skb or a trimmed, cloned version if | |
1601 | * the skb frame had data beyond the IP packet. A cloned skb allows us | |
1602 | * to leave the original skb and its full frame unchanged (which might be | |
1603 | * desirable for layer 2 frame jugglers). | |
1604 | * | |
a516993f LL |
1605 | * Caller needs to set the skb network header and free any returned skb if it |
1606 | * differs from the provided skb. | |
9afd85c9 LL |
1607 | */ |
1608 | int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1609 | { | |
1610 | int ret = ip_mc_check_iphdr(skb); | |
1611 | ||
1612 | if (ret < 0) | |
1613 | return ret; | |
1614 | ||
1615 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1616 | return -ENOMSG; | |
1617 | ||
1618 | return __ip_mc_check_igmp(skb, skb_trimmed); | |
1619 | } | |
1620 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1621 | ||
a816c7c7 | 1622 | /* |
4aa5dee4 | 1623 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1624 | */ |
4aa5dee4 | 1625 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1626 | { |
08882669 | 1627 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1628 | struct ip_mc_list *im; |
1629 | int type; | |
87a8a2ae | 1630 | struct net *net = dev_net(in_dev->dev); |
a816c7c7 | 1631 | |
4aa5dee4 JP |
1632 | ASSERT_RTNL(); |
1633 | ||
1634 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1635 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1636 | continue; | |
df2cf4a7 | 1637 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1638 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1639 | continue; |
a816c7c7 | 1640 | |
866f3b25 ED |
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 | } | |
a816c7c7 JV |
1652 | #endif |
1653 | } | |
1654 | ||
1da177e4 LT |
1655 | /* |
1656 | * A socket has left a multicast group on device dev | |
1657 | */ | |
1658 | ||
8f935bbd | 1659 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1660 | { |
1d7138de ED |
1661 | struct ip_mc_list *i; |
1662 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1663 | |
1da177e4 | 1664 | ASSERT_RTNL(); |
e905a9ed | 1665 | |
1d7138de ED |
1666 | for (ip = &in_dev->mc_list; |
1667 | (i = rtnl_dereference(*ip)) != NULL; | |
1668 | ip = &i->next_rcu) { | |
a7e9ff73 | 1669 | if (i->multiaddr == addr) { |
1da177e4 | 1670 | if (--i->users == 0) { |
e9897071 | 1671 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1672 | *ip = i->next_rcu; |
b8bae41e | 1673 | in_dev->mc_count--; |
1da177e4 | 1674 | igmp_group_dropped(i); |
24cf3af3 | 1675 | ip_mc_clear_src(i); |
1da177e4 LT |
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 | } | |
4bc2f18b | 1687 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1688 | |
75c78500 MS |
1689 | /* Device changing type */ |
1690 | ||
1691 | void ip_mc_unmap(struct in_device *in_dev) | |
1692 | { | |
1d7138de | 1693 | struct ip_mc_list *pmc; |
75c78500 MS |
1694 | |
1695 | ASSERT_RTNL(); | |
1696 | ||
1d7138de ED |
1697 | for_each_pmc_rtnl(in_dev, pmc) |
1698 | igmp_group_dropped(pmc); | |
75c78500 MS |
1699 | } |
1700 | ||
1701 | void ip_mc_remap(struct in_device *in_dev) | |
1702 | { | |
1d7138de | 1703 | struct ip_mc_list *pmc; |
75c78500 MS |
1704 | |
1705 | ASSERT_RTNL(); | |
1706 | ||
24803f38 HL |
1707 | for_each_pmc_rtnl(in_dev, pmc) { |
1708 | #ifdef CONFIG_IP_MULTICAST | |
1709 | igmpv3_del_delrec(in_dev, pmc); | |
1710 | #endif | |
0ae0d60a | 1711 | igmp_group_added(pmc); |
24803f38 | 1712 | } |
75c78500 MS |
1713 | } |
1714 | ||
1da177e4 LT |
1715 | /* Device going down */ |
1716 | ||
1717 | void ip_mc_down(struct in_device *in_dev) | |
1718 | { | |
1d7138de | 1719 | struct ip_mc_list *pmc; |
1da177e4 LT |
1720 | |
1721 | ASSERT_RTNL(); | |
1722 | ||
1d7138de ED |
1723 | for_each_pmc_rtnl(in_dev, pmc) |
1724 | igmp_group_dropped(pmc); | |
1da177e4 LT |
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); | |
1da177e4 LT |
1733 | #endif |
1734 | ||
1735 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1736 | } | |
1737 | ||
dcd87999 | 1738 | #ifdef CONFIG_IP_MULTICAST |
966c37f2 HL |
1739 | static void ip_mc_reset(struct in_device *in_dev) |
1740 | { | |
165094af | 1741 | struct net *net = dev_net(in_dev->dev); |
966c37f2 HL |
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 | } | |
dcd87999 | 1751 | #endif |
966c37f2 HL |
1752 | |
1753 | void ip_mc_init_dev(struct in_device *in_dev) | |
1754 | { | |
1da177e4 LT |
1755 | ASSERT_RTNL(); |
1756 | ||
1da177e4 | 1757 | #ifdef CONFIG_IP_MULTICAST |
e99e88a9 KC |
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); | |
1da177e4 | 1760 | #endif |
966c37f2 | 1761 | ip_mc_reset(in_dev); |
1da177e4 | 1762 | |
1da177e4 LT |
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 | { | |
1d7138de | 1770 | struct ip_mc_list *pmc; |
1da177e4 LT |
1771 | |
1772 | ASSERT_RTNL(); | |
1773 | ||
966c37f2 | 1774 | ip_mc_reset(in_dev); |
1da177e4 LT |
1775 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1776 | ||
24803f38 HL |
1777 | for_each_pmc_rtnl(in_dev, pmc) { |
1778 | #ifdef CONFIG_IP_MULTICAST | |
1779 | igmpv3_del_delrec(in_dev, pmc); | |
1780 | #endif | |
0ae0d60a | 1781 | igmp_group_added(pmc); |
24803f38 | 1782 | } |
1da177e4 LT |
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); | |
24803f38 HL |
1797 | #ifdef CONFIG_IP_MULTICAST |
1798 | igmpv3_clear_delrec(in_dev); | |
1799 | #endif | |
1da177e4 | 1800 | |
1d7138de ED |
1801 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1802 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1803 | in_dev->mc_count--; |
1da177e4 | 1804 | ip_ma_put(i); |
1da177e4 | 1805 | } |
1da177e4 LT |
1806 | } |
1807 | ||
9e917dca | 1808 | /* RTNL is locked */ |
877acedc | 1809 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1810 | { |
1da177e4 LT |
1811 | struct net_device *dev = NULL; |
1812 | struct in_device *idev = NULL; | |
1813 | ||
1814 | if (imr->imr_ifindex) { | |
877acedc | 1815 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1816 | return idev; |
1817 | } | |
1818 | if (imr->imr_address.s_addr) { | |
9e917dca | 1819 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1820 | if (!dev) |
1821 | return NULL; | |
1da177e4 LT |
1822 | } |
1823 | ||
b23dd4fe | 1824 | if (!dev) { |
78fbfd8a DM |
1825 | struct rtable *rt = ip_route_output(net, |
1826 | imr->imr_multiaddr.s_addr, | |
1827 | 0, 0, 0); | |
b23dd4fe DM |
1828 | if (!IS_ERR(rt)) { |
1829 | dev = rt->dst.dev; | |
1830 | ip_rt_put(rt); | |
1831 | } | |
1da177e4 LT |
1832 | } |
1833 | if (dev) { | |
1834 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1835 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1836 | } |
1837 | return idev; | |
1838 | } | |
1839 | ||
1840 | /* | |
1841 | * Join a socket to a group | |
1842 | */ | |
1da177e4 LT |
1843 | |
1844 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1845 | __be32 *psfsrc) |
1da177e4 LT |
1846 | { |
1847 | struct ip_sf_list *psf, *psf_prev; | |
1848 | int rv = 0; | |
1849 | ||
1850 | psf_prev = NULL; | |
c71151f0 | 1851 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
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; | |
165094af | 1867 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
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)) { | |
165094af | 1878 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
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 | ||
8f935bbd AV |
1893 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1894 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1895 | { |
1896 | struct ip_mc_list *pmc; | |
1897 | int changerec = 0; | |
1898 | int i, err; | |
1899 | ||
1900 | if (!in_dev) | |
1901 | return -ENODEV; | |
1d7138de ED |
1902 | rcu_read_lock(); |
1903 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1904 | if (*pmca == pmc->multiaddr) |
1905 | break; | |
1906 | } | |
1907 | if (!pmc) { | |
1908 | /* MCA not found?? bug */ | |
1d7138de | 1909 | rcu_read_unlock(); |
1da177e4 LT |
1910 | return -ESRCH; |
1911 | } | |
1912 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1913 | rcu_read_unlock(); |
1da177e4 LT |
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; | |
c71151f0 | 1924 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
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; | |
165094af | 1936 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1937 | #endif |
1938 | ||
1939 | /* filter mode change */ | |
1940 | pmc->sfmode = MCAST_INCLUDE; | |
1941 | #ifdef CONFIG_IP_MULTICAST | |
165094af | 1942 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1943 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 1944 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
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, | |
5eb81e89 | 1960 | __be32 *psfsrc) |
1da177e4 LT |
1961 | { |
1962 | struct ip_sf_list *psf, *psf_prev; | |
1963 | ||
1964 | psf_prev = NULL; | |
c71151f0 | 1965 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1966 | if (psf->sf_inaddr == *psfsrc) |
1967 | break; | |
1968 | psf_prev = psf; | |
1969 | } | |
1970 | if (!psf) { | |
0da974f4 | 1971 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1972 | if (!psf) |
1973 | return -ENOBUFS; | |
1da177e4 LT |
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 | ||
c71151f0 | 1993 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
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 | { | |
ad12583f | 2004 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
2005 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
2006 | int qrv = pmc->interface->mr_qrv; | |
2007 | int new_in, rv; | |
2008 | ||
2009 | rv = 0; | |
c71151f0 | 2010 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
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; | |
ad12583f DS |
2016 | if (new_in) { |
2017 | if (!psf->sf_oldin) { | |
76edc605 | 2018 | struct ip_sf_list *prev = NULL; |
ad12583f | 2019 | |
c71151f0 | 2020 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
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 | */ | |
c71151f0 | 2042 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
2043 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
2044 | break; | |
2045 | if (!dpsf) { | |
3ed37a6f | 2046 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
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; | |
1da177e4 LT |
2055 | rv++; |
2056 | } | |
2057 | } | |
2058 | return rv; | |
2059 | } | |
2060 | #endif | |
2061 | ||
2062 | /* | |
2063 | * Add multicast source filter list to the interface list | |
2064 | */ | |
8f935bbd AV |
2065 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
2066 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
2067 | { |
2068 | struct ip_mc_list *pmc; | |
2069 | int isexclude; | |
2070 | int i, err; | |
2071 | ||
2072 | if (!in_dev) | |
2073 | return -ENODEV; | |
1d7138de ED |
2074 | rcu_read_lock(); |
2075 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
2076 | if (*pmca == pmc->multiaddr) |
2077 | break; | |
2078 | } | |
2079 | if (!pmc) { | |
2080 | /* MCA not found?? bug */ | |
1d7138de | 2081 | rcu_read_unlock(); |
1da177e4 LT |
2082 | return -ESRCH; |
2083 | } | |
2084 | spin_lock_bh(&pmc->lock); | |
1d7138de | 2085 | rcu_read_unlock(); |
1da177e4 LT |
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; | |
c71151f0 | 2094 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 2095 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
2096 | if (err) |
2097 | break; | |
2098 | } | |
2099 | if (err) { | |
2100 | int j; | |
2101 | ||
685f94e6 JZ |
2102 | if (!delta) |
2103 | pmc->sfcount[sfmode]--; | |
c71151f0 | 2104 | for (j = 0; j < i; j++) |
a1889c0d | 2105 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
2106 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
2107 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 2108 | struct ip_sf_list *psf; |
165094af | 2109 | struct net *net = dev_net(pmc->interface->dev); |
cfcabdcc | 2110 | in_dev = pmc->interface; |
1da177e4 LT |
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 | ||
165094af | 2121 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 2122 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 2123 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
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 | { | |
c38b7d32 | 2136 | struct ip_sf_list *psf, *nextpsf, *tomb, *sources; |
1da177e4 | 2137 | |
c38b7d32 WC |
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 | for (psf = tomb; psf; psf = nextpsf) { | |
1da177e4 LT |
2149 | nextpsf = psf->sf_next; |
2150 | kfree(psf); | |
2151 | } | |
c38b7d32 | 2152 | for (psf = sources; psf; psf = nextpsf) { |
1da177e4 LT |
2153 | nextpsf = psf->sf_next; |
2154 | kfree(psf); | |
2155 | } | |
1da177e4 LT |
2156 | } |
2157 | ||
54ff9ef3 MRL |
2158 | /* Join a multicast group |
2159 | */ | |
6e2059b5 HL |
2160 | static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr, |
2161 | unsigned int mode) | |
1da177e4 | 2162 | { |
8f935bbd | 2163 | __be32 addr = imr->imr_multiaddr.s_addr; |
959d10f6 | 2164 | struct ip_mc_socklist *iml, *i; |
1da177e4 LT |
2165 | struct in_device *in_dev; |
2166 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 2167 | struct net *net = sock_net(sk); |
ca9b907d | 2168 | int ifindex; |
1da177e4 | 2169 | int count = 0; |
959d10f6 ED |
2170 | int err; |
2171 | ||
2172 | ASSERT_RTNL(); | |
1da177e4 | 2173 | |
f97c1e0c | 2174 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2175 | return -EINVAL; |
2176 | ||
877acedc | 2177 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
2178 | |
2179 | if (!in_dev) { | |
1da177e4 LT |
2180 | err = -ENODEV; |
2181 | goto done; | |
2182 | } | |
2183 | ||
1da177e4 | 2184 | err = -EADDRINUSE; |
ca9b907d | 2185 | ifindex = imr->imr_ifindex; |
1d7138de | 2186 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
2187 | if (i->multi.imr_multiaddr.s_addr == addr && |
2188 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 2189 | goto done; |
1da177e4 LT |
2190 | count++; |
2191 | } | |
2192 | err = -ENOBUFS; | |
815c5270 | 2193 | if (count >= net->ipv4.sysctl_igmp_max_memberships) |
ca9b907d | 2194 | goto done; |
a7e9ff73 | 2195 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
51456b29 | 2196 | if (!iml) |
1da177e4 | 2197 | goto done; |
ca9b907d | 2198 | |
1da177e4 | 2199 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 2200 | iml->next_rcu = inet->mc_list; |
1da177e4 | 2201 | iml->sflist = NULL; |
6e2059b5 | 2202 | iml->sfmode = mode; |
cf778b00 | 2203 | rcu_assign_pointer(inet->mc_list, iml); |
6e2059b5 | 2204 | __ip_mc_inc_group(in_dev, addr, mode); |
1da177e4 | 2205 | err = 0; |
1da177e4 | 2206 | done: |
1da177e4 LT |
2207 | return err; |
2208 | } | |
6e2059b5 HL |
2209 | |
2210 | /* Join ASM (Any-Source Multicast) group | |
2211 | */ | |
2212 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
2213 | { | |
2214 | return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE); | |
2215 | } | |
4bc2f18b | 2216 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 | 2217 | |
6e2059b5 HL |
2218 | /* Join SSM (Source-Specific Multicast) group |
2219 | */ | |
2220 | int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, | |
2221 | unsigned int mode) | |
2222 | { | |
2223 | return __ip_mc_join_group(sk, imr, mode); | |
2224 | } | |
2225 | ||
1da177e4 LT |
2226 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, |
2227 | struct in_device *in_dev) | |
2228 | { | |
1d7138de | 2229 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
2230 | int err; |
2231 | ||
51456b29 | 2232 | if (!psf) { |
1da177e4 LT |
2233 | /* any-source empty exclude case */ |
2234 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2235 | iml->sfmode, 0, NULL, 0); | |
2236 | } | |
2237 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 2238 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 2239 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
2240 | /* decrease mem now to avoid the memleak warning */ |
2241 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2242 | kfree_rcu(psf, rcu); |
1da177e4 LT |
2243 | return err; |
2244 | } | |
2245 | ||
54ff9ef3 | 2246 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
1da177e4 LT |
2247 | { |
2248 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
2249 | struct ip_mc_socklist *iml; |
2250 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 2251 | struct in_device *in_dev; |
877acedc | 2252 | struct net *net = sock_net(sk); |
8f935bbd | 2253 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 2254 | u32 ifindex; |
acd6e00b | 2255 | int ret = -EADDRNOTAVAIL; |
1da177e4 | 2256 | |
959d10f6 ED |
2257 | ASSERT_RTNL(); |
2258 | ||
877acedc | 2259 | in_dev = ip_mc_find_dev(net, imr); |
4eba7bb1 | 2260 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
52ad353a | 2261 | ret = -ENODEV; |
2262 | goto out; | |
2263 | } | |
84b42bae | 2264 | ifindex = imr->imr_ifindex; |
1d7138de ED |
2265 | for (imlp = &inet->mc_list; |
2266 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2267 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
2268 | if (iml->multi.imr_multiaddr.s_addr != group) |
2269 | continue; | |
2270 | if (ifindex) { | |
2271 | if (iml->multi.imr_ifindex != ifindex) | |
2272 | continue; | |
2273 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2274 | iml->multi.imr_address.s_addr) | |
2275 | continue; | |
1da177e4 | 2276 | |
acd6e00b | 2277 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 2278 | |
1d7138de | 2279 | *imlp = iml->next_rcu; |
acd6e00b | 2280 | |
4eba7bb1 AL |
2281 | if (in_dev) |
2282 | ip_mc_dec_group(in_dev, group); | |
959d10f6 | 2283 | |
c85bb41e FL |
2284 | /* decrease mem now to avoid the memleak warning */ |
2285 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2286 | kfree_rcu(iml, rcu); |
acd6e00b | 2287 | return 0; |
1da177e4 | 2288 | } |
52ad353a | 2289 | out: |
959d10f6 ED |
2290 | return ret; |
2291 | } | |
193ba924 | 2292 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
2293 | |
2294 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2295 | ip_mreq_source *mreqs, int ifindex) | |
2296 | { | |
2297 | int err; | |
2298 | struct ip_mreqn imr; | |
63007727 | 2299 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
2300 | struct ip_mc_socklist *pmc; |
2301 | struct in_device *in_dev = NULL; | |
2302 | struct inet_sock *inet = inet_sk(sk); | |
2303 | struct ip_sf_socklist *psl; | |
877acedc | 2304 | struct net *net = sock_net(sk); |
8cdaaa15 | 2305 | int leavegroup = 0; |
1da177e4 LT |
2306 | int i, j, rv; |
2307 | ||
f97c1e0c | 2308 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2309 | return -EINVAL; |
2310 | ||
54ff9ef3 | 2311 | ASSERT_RTNL(); |
1da177e4 LT |
2312 | |
2313 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2314 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2315 | imr.imr_ifindex = ifindex; | |
877acedc | 2316 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2317 | |
2318 | if (!in_dev) { | |
2319 | err = -ENODEV; | |
2320 | goto done; | |
2321 | } | |
2322 | err = -EADDRNOTAVAIL; | |
2323 | ||
1d7138de | 2324 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2325 | if ((pmc->multi.imr_multiaddr.s_addr == |
2326 | imr.imr_multiaddr.s_addr) && | |
2327 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2328 | break; |
2329 | } | |
917f2f10 DS |
2330 | if (!pmc) { /* must have a prior join */ |
2331 | err = -EINVAL; | |
1da177e4 | 2332 | goto done; |
917f2f10 | 2333 | } |
1da177e4 LT |
2334 | /* if a source filter was set, must be the same mode as before */ |
2335 | if (pmc->sflist) { | |
917f2f10 DS |
2336 | if (pmc->sfmode != omode) { |
2337 | err = -EINVAL; | |
1da177e4 | 2338 | goto done; |
917f2f10 | 2339 | } |
1da177e4 LT |
2340 | } else if (pmc->sfmode != omode) { |
2341 | /* allow mode switches for empty-set filters */ | |
2342 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2343 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2344 | NULL, 0); |
2345 | pmc->sfmode = omode; | |
2346 | } | |
2347 | ||
1d7138de | 2348 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2349 | if (!add) { |
2350 | if (!psl) | |
917f2f10 | 2351 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2352 | rv = !0; |
c71151f0 | 2353 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2354 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2355 | sizeof(__be32)); |
1da177e4 LT |
2356 | if (rv == 0) |
2357 | break; | |
2358 | } | |
2359 | if (rv) /* source not found */ | |
917f2f10 | 2360 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2361 | |
8cdaaa15 DS |
2362 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2363 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2364 | leavegroup = 1; | |
2365 | goto done; | |
2366 | } | |
2367 | ||
1da177e4 | 2368 | /* update the interface filter */ |
e905a9ed | 2369 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2370 | &mreqs->imr_sourceaddr, 1); |
2371 | ||
c71151f0 | 2372 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2373 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2374 | psl->sl_count--; | |
2375 | err = 0; | |
2376 | goto done; | |
2377 | } | |
2378 | /* else, add a new source to the filter */ | |
2379 | ||
166b6b2d | 2380 | if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { |
1da177e4 LT |
2381 | err = -ENOBUFS; |
2382 | goto done; | |
2383 | } | |
2384 | if (!psl || psl->sl_count == psl->sl_max) { | |
2385 | struct ip_sf_socklist *newpsl; | |
2386 | int count = IP_SFBLOCK; | |
2387 | ||
2388 | if (psl) | |
2389 | count += psl->sl_max; | |
8b3a7005 | 2390 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2391 | if (!newpsl) { |
2392 | err = -ENOBUFS; | |
2393 | goto done; | |
2394 | } | |
2395 | newpsl->sl_max = count; | |
2396 | newpsl->sl_count = count - IP_SFBLOCK; | |
2397 | if (psl) { | |
c71151f0 | 2398 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2399 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e FL |
2400 | /* decrease mem now to avoid the memleak warning */ |
2401 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2402 | kfree_rcu(psl, rcu); |
1da177e4 | 2403 | } |
cf778b00 | 2404 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2405 | psl = newpsl; |
1da177e4 LT |
2406 | } |
2407 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2408 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2409 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2410 | sizeof(__be32)); |
1da177e4 LT |
2411 | if (rv == 0) |
2412 | break; | |
2413 | } | |
2414 | if (rv == 0) /* address already there is an error */ | |
2415 | goto done; | |
c71151f0 | 2416 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2417 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2418 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2419 | psl->sl_count++; | |
2420 | err = 0; | |
2421 | /* update the interface list */ | |
e905a9ed | 2422 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2423 | &mreqs->imr_sourceaddr, 1); |
2424 | done: | |
8cdaaa15 | 2425 | if (leavegroup) |
54ff9ef3 | 2426 | err = ip_mc_leave_group(sk, &imr); |
1da177e4 LT |
2427 | return err; |
2428 | } | |
2429 | ||
2430 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2431 | { | |
9951f036 | 2432 | int err = 0; |
1da177e4 | 2433 | struct ip_mreqn imr; |
63007727 | 2434 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2435 | struct ip_mc_socklist *pmc; |
2436 | struct in_device *in_dev; | |
2437 | struct inet_sock *inet = inet_sk(sk); | |
2438 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2439 | struct net *net = sock_net(sk); |
9951f036 | 2440 | int leavegroup = 0; |
1da177e4 | 2441 | |
f97c1e0c | 2442 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2443 | return -EINVAL; |
2444 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2445 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2446 | return -EINVAL; | |
2447 | ||
54ff9ef3 | 2448 | ASSERT_RTNL(); |
1da177e4 LT |
2449 | |
2450 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2451 | imr.imr_address.s_addr = msf->imsf_interface; | |
2452 | imr.imr_ifindex = ifindex; | |
877acedc | 2453 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2454 | |
2455 | if (!in_dev) { | |
2456 | err = -ENODEV; | |
2457 | goto done; | |
2458 | } | |
1da177e4 | 2459 | |
9951f036 DS |
2460 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2461 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2462 | leavegroup = 1; | |
2463 | goto done; | |
2464 | } | |
2465 | ||
1d7138de | 2466 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2467 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2468 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2469 | break; | |
2470 | } | |
917f2f10 DS |
2471 | if (!pmc) { /* must have a prior join */ |
2472 | err = -EINVAL; | |
1da177e4 | 2473 | goto done; |
917f2f10 | 2474 | } |
1da177e4 | 2475 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2476 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2477 | GFP_KERNEL); | |
1da177e4 LT |
2478 | if (!newpsl) { |
2479 | err = -ENOBUFS; | |
2480 | goto done; | |
2481 | } | |
2482 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2483 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2484 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2485 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2486 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2487 | if (err) { | |
2488 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2489 | goto done; | |
2490 | } | |
8713dbf0 | 2491 | } else { |
1da177e4 | 2492 | newpsl = NULL; |
8713dbf0 YZ |
2493 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2494 | msf->imsf_fmode, 0, NULL, 0); | |
2495 | } | |
1d7138de | 2496 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2497 | if (psl) { |
2498 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2499 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2500 | /* decrease mem now to avoid the memleak warning */ |
2501 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2502 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2503 | } else |
2504 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2505 | 0, NULL, 0); | |
cf778b00 | 2506 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2507 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2508 | err = 0; |
1da177e4 | 2509 | done: |
9951f036 DS |
2510 | if (leavegroup) |
2511 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2512 | return err; |
2513 | } | |
2514 | ||
2515 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2516 | struct ip_msfilter __user *optval, int __user *optlen) | |
2517 | { | |
2518 | int err, len, count, copycount; | |
2519 | struct ip_mreqn imr; | |
63007727 | 2520 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2521 | struct ip_mc_socklist *pmc; |
2522 | struct in_device *in_dev; | |
2523 | struct inet_sock *inet = inet_sk(sk); | |
2524 | struct ip_sf_socklist *psl; | |
877acedc | 2525 | struct net *net = sock_net(sk); |
1da177e4 | 2526 | |
87e9f031 WC |
2527 | ASSERT_RTNL(); |
2528 | ||
f97c1e0c | 2529 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2530 | return -EINVAL; |
2531 | ||
1da177e4 LT |
2532 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
2533 | imr.imr_address.s_addr = msf->imsf_interface; | |
2534 | imr.imr_ifindex = 0; | |
877acedc | 2535 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2536 | |
2537 | if (!in_dev) { | |
2538 | err = -ENODEV; | |
2539 | goto done; | |
2540 | } | |
2541 | err = -EADDRNOTAVAIL; | |
2542 | ||
1d7138de | 2543 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2544 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2545 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2546 | break; | |
2547 | } | |
2548 | if (!pmc) /* must have a prior join */ | |
2549 | goto done; | |
2550 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2551 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2552 | if (!psl) { |
2553 | len = 0; | |
2554 | count = 0; | |
2555 | } else { | |
2556 | count = psl->sl_count; | |
2557 | } | |
2558 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2559 | len = copycount * sizeof(psl->sl_addr[0]); | |
2560 | msf->imsf_numsrc = count; | |
2561 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2562 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2563 | return -EFAULT; | |
2564 | } | |
2565 | if (len && | |
2566 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2567 | return -EFAULT; | |
2568 | return 0; | |
2569 | done: | |
1da177e4 LT |
2570 | return err; |
2571 | } | |
2572 | ||
2573 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2574 | struct group_filter __user *optval, int __user *optlen) | |
2575 | { | |
2576 | int err, i, count, copycount; | |
2577 | struct sockaddr_in *psin; | |
63007727 | 2578 | __be32 addr; |
1da177e4 LT |
2579 | struct ip_mc_socklist *pmc; |
2580 | struct inet_sock *inet = inet_sk(sk); | |
2581 | struct ip_sf_socklist *psl; | |
2582 | ||
87e9f031 WC |
2583 | ASSERT_RTNL(); |
2584 | ||
1da177e4 LT |
2585 | psin = (struct sockaddr_in *)&gsf->gf_group; |
2586 | if (psin->sin_family != AF_INET) | |
2587 | return -EINVAL; | |
2588 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2589 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2590 | return -EINVAL; |
2591 | ||
1da177e4 LT |
2592 | err = -EADDRNOTAVAIL; |
2593 | ||
1d7138de | 2594 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2595 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2596 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2597 | break; | |
2598 | } | |
2599 | if (!pmc) /* must have a prior join */ | |
2600 | goto done; | |
2601 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2602 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2603 | count = psl ? psl->sl_count : 0; |
2604 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2605 | gsf->gf_numsrc = count; | |
2606 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2607 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2608 | return -EFAULT; | |
2609 | } | |
c71151f0 | 2610 | for (i = 0; i < copycount; i++) { |
1da177e4 LT |
2611 | struct sockaddr_storage ss; |
2612 | ||
2613 | psin = (struct sockaddr_in *)&ss; | |
2614 | memset(&ss, 0, sizeof(ss)); | |
2615 | psin->sin_family = AF_INET; | |
2616 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2617 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2618 | return -EFAULT; | |
2619 | } | |
2620 | return 0; | |
2621 | done: | |
1da177e4 LT |
2622 | return err; |
2623 | } | |
2624 | ||
2625 | /* | |
2626 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2627 | */ | |
60d9b031 DA |
2628 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, |
2629 | int dif, int sdif) | |
1da177e4 LT |
2630 | { |
2631 | struct inet_sock *inet = inet_sk(sk); | |
2632 | struct ip_mc_socklist *pmc; | |
2633 | struct ip_sf_socklist *psl; | |
2634 | int i; | |
c85bb41e | 2635 | int ret; |
1da177e4 | 2636 | |
c85bb41e | 2637 | ret = 1; |
f97c1e0c | 2638 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2639 | goto out; |
1da177e4 | 2640 | |
c85bb41e | 2641 | rcu_read_lock(); |
1d7138de | 2642 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 | 2643 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
60d9b031 DA |
2644 | (pmc->multi.imr_ifindex == dif || |
2645 | (sdif && pmc->multi.imr_ifindex == sdif))) | |
1da177e4 LT |
2646 | break; |
2647 | } | |
c85bb41e | 2648 | ret = inet->mc_all; |
1da177e4 | 2649 | if (!pmc) |
c85bb41e | 2650 | goto unlock; |
1d7138de | 2651 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2652 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2653 | if (!psl) |
c85bb41e | 2654 | goto unlock; |
1da177e4 | 2655 | |
c71151f0 | 2656 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2657 | if (psl->sl_addr[i] == rmt_addr) |
2658 | break; | |
2659 | } | |
c85bb41e | 2660 | ret = 0; |
1da177e4 | 2661 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2662 | goto unlock; |
1da177e4 | 2663 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2664 | goto unlock; |
2665 | ret = 1; | |
2666 | unlock: | |
2667 | rcu_read_unlock(); | |
2668 | out: | |
2669 | return ret; | |
1da177e4 LT |
2670 | } |
2671 | ||
2672 | /* | |
2673 | * A socket is closing. | |
2674 | */ | |
2675 | ||
2676 | void ip_mc_drop_socket(struct sock *sk) | |
2677 | { | |
2678 | struct inet_sock *inet = inet_sk(sk); | |
2679 | struct ip_mc_socklist *iml; | |
877acedc | 2680 | struct net *net = sock_net(sk); |
1da177e4 | 2681 | |
51456b29 | 2682 | if (!inet->mc_list) |
1da177e4 LT |
2683 | return; |
2684 | ||
2685 | rtnl_lock(); | |
1d7138de | 2686 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2687 | struct in_device *in_dev; |
1da177e4 | 2688 | |
1d7138de | 2689 | inet->mc_list = iml->next_rcu; |
877acedc | 2690 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2691 | (void) ip_mc_leave_src(sk, iml, in_dev); |
00db4124 | 2692 | if (in_dev) |
1da177e4 | 2693 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2694 | /* decrease mem now to avoid the memleak warning */ |
2695 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2696 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2697 | } |
2698 | rtnl_unlock(); | |
2699 | } | |
2700 | ||
dbdd9a52 | 2701 | /* called with rcu_read_lock() */ |
2094acbb | 2702 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
1da177e4 LT |
2703 | { |
2704 | struct ip_mc_list *im; | |
e9897071 | 2705 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2706 | struct ip_sf_list *psf; |
2707 | int rv = 0; | |
2708 | ||
e9897071 ED |
2709 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2710 | if (mc_hash) { | |
c70eba74 | 2711 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2712 | |
2713 | for (im = rcu_dereference(mc_hash[hash]); | |
2714 | im != NULL; | |
2715 | im = rcu_dereference(im->next_hash)) { | |
2716 | if (im->multiaddr == mc_addr) | |
2717 | break; | |
2718 | } | |
2719 | } else { | |
2720 | for_each_pmc_rcu(in_dev, im) { | |
2721 | if (im->multiaddr == mc_addr) | |
2722 | break; | |
2723 | } | |
1da177e4 LT |
2724 | } |
2725 | if (im && proto == IPPROTO_IGMP) { | |
2726 | rv = 1; | |
2727 | } else if (im) { | |
2728 | if (src_addr) { | |
c71151f0 | 2729 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2730 | if (psf->sf_inaddr == src_addr) |
2731 | break; | |
2732 | } | |
2733 | if (psf) | |
2734 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2735 | psf->sf_count[MCAST_EXCLUDE] != | |
2736 | im->sfcount[MCAST_EXCLUDE]; | |
2737 | else | |
2738 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2739 | } else | |
2740 | rv = 1; /* unspecified source; tentatively allow */ | |
2741 | } | |
1da177e4 LT |
2742 | return rv; |
2743 | } | |
2744 | ||
2745 | #if defined(CONFIG_PROC_FS) | |
2746 | struct igmp_mc_iter_state { | |
7091e728 | 2747 | struct seq_net_private p; |
1da177e4 LT |
2748 | struct net_device *dev; |
2749 | struct in_device *in_dev; | |
2750 | }; | |
2751 | ||
2752 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2753 | ||
2754 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2755 | { | |
7091e728 | 2756 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2757 | struct ip_mc_list *im = NULL; |
2758 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2759 | ||
7562f876 | 2760 | state->in_dev = NULL; |
61fbab77 | 2761 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2762 | struct in_device *in_dev; |
6baff150 ED |
2763 | |
2764 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2765 | if (!in_dev) |
2766 | continue; | |
1d7138de | 2767 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2768 | if (im) { |
2769 | state->in_dev = in_dev; | |
2770 | break; | |
2771 | } | |
1da177e4 LT |
2772 | } |
2773 | return im; | |
2774 | } | |
2775 | ||
2776 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2777 | { | |
2778 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2779 | |
1d7138de ED |
2780 | im = rcu_dereference(im->next_rcu); |
2781 | while (!im) { | |
6baff150 | 2782 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2783 | if (!state->dev) { |
2784 | state->in_dev = NULL; | |
2785 | break; | |
2786 | } | |
6baff150 | 2787 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2788 | if (!state->in_dev) |
2789 | continue; | |
1d7138de | 2790 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2791 | } |
2792 | return im; | |
2793 | } | |
2794 | ||
2795 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2796 | { | |
2797 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2798 | if (im) | |
2799 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2800 | --pos; | |
2801 | return pos ? NULL : im; | |
2802 | } | |
2803 | ||
2804 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2805 | __acquires(rcu) |
1da177e4 | 2806 | { |
61fbab77 | 2807 | rcu_read_lock(); |
1da177e4 LT |
2808 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2809 | } | |
2810 | ||
2811 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2812 | { | |
2813 | struct ip_mc_list *im; | |
2814 | if (v == SEQ_START_TOKEN) | |
2815 | im = igmp_mc_get_first(seq); | |
2816 | else | |
2817 | im = igmp_mc_get_next(seq, v); | |
2818 | ++*pos; | |
2819 | return im; | |
2820 | } | |
2821 | ||
2822 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2823 | __releases(rcu) |
1da177e4 LT |
2824 | { |
2825 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2826 | |
2827 | state->in_dev = NULL; | |
1da177e4 | 2828 | state->dev = NULL; |
61fbab77 | 2829 | rcu_read_unlock(); |
1da177e4 LT |
2830 | } |
2831 | ||
2832 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2833 | { | |
2834 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2835 | seq_puts(seq, |
1da177e4 LT |
2836 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2837 | else { | |
2838 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2839 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2840 | char *querier; | |
a399a805 ED |
2841 | long delta; |
2842 | ||
1da177e4 LT |
2843 | #ifdef CONFIG_IP_MULTICAST |
2844 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2845 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2846 | "V3"; | |
2847 | #else | |
2848 | querier = "NONE"; | |
2849 | #endif | |
2850 | ||
e6b68883 | 2851 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2852 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2853 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2854 | } |
2855 | ||
a399a805 | 2856 | delta = im->timer.expires - jiffies; |
1da177e4 | 2857 | seq_printf(seq, |
338fcf98 | 2858 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2859 | im->multiaddr, im->users, |
a399a805 ED |
2860 | im->tm_running, |
2861 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2862 | im->reporter); |
2863 | } | |
2864 | return 0; | |
2865 | } | |
2866 | ||
f690808e | 2867 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2868 | .start = igmp_mc_seq_start, |
2869 | .next = igmp_mc_seq_next, | |
2870 | .stop = igmp_mc_seq_stop, | |
2871 | .show = igmp_mc_seq_show, | |
2872 | }; | |
2873 | ||
1da177e4 | 2874 | struct igmp_mcf_iter_state { |
7091e728 | 2875 | struct seq_net_private p; |
1da177e4 LT |
2876 | struct net_device *dev; |
2877 | struct in_device *idev; | |
2878 | struct ip_mc_list *im; | |
2879 | }; | |
2880 | ||
2881 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2882 | ||
2883 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2884 | { | |
7091e728 | 2885 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2886 | struct ip_sf_list *psf = NULL; |
2887 | struct ip_mc_list *im = NULL; | |
2888 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2889 | ||
7562f876 PE |
2890 | state->idev = NULL; |
2891 | state->im = NULL; | |
61fbab77 | 2892 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2893 | struct in_device *idev; |
6baff150 | 2894 | idev = __in_dev_get_rcu(state->dev); |
51456b29 | 2895 | if (unlikely(!idev)) |
1da177e4 | 2896 | continue; |
1d7138de | 2897 | im = rcu_dereference(idev->mc_list); |
00db4124 | 2898 | if (likely(im)) { |
1da177e4 LT |
2899 | spin_lock_bh(&im->lock); |
2900 | psf = im->sources; | |
00db4124 | 2901 | if (likely(psf)) { |
1da177e4 LT |
2902 | state->im = im; |
2903 | state->idev = idev; | |
2904 | break; | |
2905 | } | |
2906 | spin_unlock_bh(&im->lock); | |
2907 | } | |
1da177e4 LT |
2908 | } |
2909 | return psf; | |
2910 | } | |
2911 | ||
2912 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2913 | { | |
2914 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2915 | ||
2916 | psf = psf->sf_next; | |
2917 | while (!psf) { | |
2918 | spin_unlock_bh(&state->im->lock); | |
2919 | state->im = state->im->next; | |
2920 | while (!state->im) { | |
6baff150 | 2921 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2922 | if (!state->dev) { |
2923 | state->idev = NULL; | |
2924 | goto out; | |
2925 | } | |
6baff150 | 2926 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2927 | if (!state->idev) |
2928 | continue; | |
1d7138de | 2929 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2930 | } |
2931 | if (!state->im) | |
2932 | break; | |
2933 | spin_lock_bh(&state->im->lock); | |
2934 | psf = state->im->sources; | |
2935 | } | |
2936 | out: | |
2937 | return psf; | |
2938 | } | |
2939 | ||
2940 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2941 | { | |
2942 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2943 | if (psf) | |
2944 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2945 | --pos; | |
2946 | return pos ? NULL : psf; | |
2947 | } | |
2948 | ||
2949 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2950 | __acquires(rcu) |
1da177e4 | 2951 | { |
61fbab77 | 2952 | rcu_read_lock(); |
1da177e4 LT |
2953 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2954 | } | |
2955 | ||
2956 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2957 | { | |
2958 | struct ip_sf_list *psf; | |
2959 | if (v == SEQ_START_TOKEN) | |
2960 | psf = igmp_mcf_get_first(seq); | |
2961 | else | |
2962 | psf = igmp_mcf_get_next(seq, v); | |
2963 | ++*pos; | |
2964 | return psf; | |
2965 | } | |
2966 | ||
2967 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2968 | __releases(rcu) |
1da177e4 LT |
2969 | { |
2970 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
00db4124 | 2971 | if (likely(state->im)) { |
1da177e4 LT |
2972 | spin_unlock_bh(&state->im->lock); |
2973 | state->im = NULL; | |
2974 | } | |
1d7138de | 2975 | state->idev = NULL; |
1da177e4 | 2976 | state->dev = NULL; |
61fbab77 | 2977 | rcu_read_unlock(); |
1da177e4 LT |
2978 | } |
2979 | ||
2980 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2981 | { | |
2982 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2983 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2984 | ||
2985 | if (v == SEQ_START_TOKEN) { | |
1744bea1 | 2986 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
1da177e4 LT |
2987 | } else { |
2988 | seq_printf(seq, | |
2989 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2990 | "0x%08x %6lu %6lu\n", |
2991 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2992 | ntohl(state->im->multiaddr), |
2993 | ntohl(psf->sf_inaddr), | |
2994 | psf->sf_count[MCAST_INCLUDE], | |
2995 | psf->sf_count[MCAST_EXCLUDE]); | |
2996 | } | |
2997 | return 0; | |
2998 | } | |
2999 | ||
f690808e | 3000 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
3001 | .start = igmp_mcf_seq_start, |
3002 | .next = igmp_mcf_seq_next, | |
3003 | .stop = igmp_mcf_seq_stop, | |
3004 | .show = igmp_mcf_seq_show, | |
3005 | }; | |
3006 | ||
2c8c1e72 | 3007 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 3008 | { |
7091e728 | 3009 | struct proc_dir_entry *pde; |
93a714d6 | 3010 | int err; |
7091e728 | 3011 | |
c3506372 CH |
3012 | pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops, |
3013 | sizeof(struct igmp_mc_iter_state)); | |
7091e728 AD |
3014 | if (!pde) |
3015 | goto out_igmp; | |
c3506372 CH |
3016 | pde = proc_create_net("mcfilter", 0444, net->proc_net, |
3017 | &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state)); | |
7091e728 AD |
3018 | if (!pde) |
3019 | goto out_mcfilter; | |
93a714d6 MC |
3020 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
3021 | SOCK_DGRAM, 0, net); | |
3022 | if (err < 0) { | |
3023 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
3024 | err); | |
3025 | goto out_sock; | |
3026 | } | |
3027 | ||
1da177e4 | 3028 | return 0; |
7091e728 | 3029 | |
93a714d6 MC |
3030 | out_sock: |
3031 | remove_proc_entry("mcfilter", net->proc_net); | |
7091e728 | 3032 | out_mcfilter: |
ece31ffd | 3033 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
3034 | out_igmp: |
3035 | return -ENOMEM; | |
3036 | } | |
3037 | ||
2c8c1e72 | 3038 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 3039 | { |
ece31ffd G |
3040 | remove_proc_entry("mcfilter", net->proc_net); |
3041 | remove_proc_entry("igmp", net->proc_net); | |
93a714d6 | 3042 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
7091e728 AD |
3043 | } |
3044 | ||
3045 | static struct pernet_operations igmp_net_ops = { | |
3046 | .init = igmp_net_init, | |
3047 | .exit = igmp_net_exit, | |
3048 | }; | |
72c1d3bd | 3049 | #endif |
7091e728 | 3050 | |
4aa5dee4 JP |
3051 | static int igmp_netdev_event(struct notifier_block *this, |
3052 | unsigned long event, void *ptr) | |
3053 | { | |
3054 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3055 | struct in_device *in_dev; | |
3056 | ||
3057 | switch (event) { | |
3058 | case NETDEV_RESEND_IGMP: | |
3059 | in_dev = __in_dev_get_rtnl(dev); | |
3060 | if (in_dev) | |
3061 | ip_mc_rejoin_groups(in_dev); | |
3062 | break; | |
3063 | default: | |
3064 | break; | |
3065 | } | |
3066 | return NOTIFY_DONE; | |
3067 | } | |
3068 | ||
3069 | static struct notifier_block igmp_notifier = { | |
3070 | .notifier_call = igmp_netdev_event, | |
3071 | }; | |
3072 | ||
72c1d3bd | 3073 | int __init igmp_mc_init(void) |
7091e728 | 3074 | { |
72c1d3bd | 3075 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
3076 | int err; |
3077 | ||
3078 | err = register_pernet_subsys(&igmp_net_ops); | |
3079 | if (err) | |
3080 | return err; | |
3081 | err = register_netdevice_notifier(&igmp_notifier); | |
3082 | if (err) | |
3083 | goto reg_notif_fail; | |
3084 | return 0; | |
3085 | ||
3086 | reg_notif_fail: | |
3087 | unregister_pernet_subsys(&igmp_net_ops); | |
3088 | return err; | |
72c1d3bd WC |
3089 | #else |
3090 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 3091 | #endif |
72c1d3bd | 3092 | } |