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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_V1_ROUTER_PRESENT_TIMEOUT (400*HZ) |
115 | #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ) | |
116 | #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) | |
117 | #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) | |
118 | #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) | |
119 | #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2 | |
1da177e4 LT |
120 | |
121 | ||
436f7c20 | 122 | #define IGMP_INITIAL_REPORT_DELAY (1) |
1da177e4 | 123 | |
436f7c20 | 124 | /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! |
1da177e4 LT |
125 | * IGMP specs require to report membership immediately after |
126 | * joining a group, but we delay the first report by a | |
127 | * small interval. It seems more natural and still does not | |
128 | * contradict to specs provided this delay is small enough. | |
129 | */ | |
130 | ||
42f811b8 | 131 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 132 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
133 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
134 | ((in_dev)->mr_v1_seen && \ | |
135 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
136 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 137 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
138 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
139 | ((in_dev)->mr_v2_seen && \ | |
140 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 | 141 | |
cab70040 WM |
142 | static int unsolicited_report_interval(struct in_device *in_dev) |
143 | { | |
2690048c WM |
144 | int interval_ms, interval_jiffies; |
145 | ||
cab70040 | 146 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
2690048c WM |
147 | interval_ms = IN_DEV_CONF_GET( |
148 | in_dev, | |
149 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
cab70040 | 150 | else /* v3 */ |
2690048c WM |
151 | interval_ms = IN_DEV_CONF_GET( |
152 | in_dev, | |
153 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
154 | ||
155 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
156 | ||
157 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
158 | * we always return a positive value. | |
159 | */ | |
160 | if (interval_jiffies <= 0) | |
161 | interval_jiffies = 1; | |
162 | return interval_jiffies; | |
cab70040 WM |
163 | } |
164 | ||
1da177e4 | 165 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
24803f38 | 166 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
1da177e4 LT |
167 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
168 | static int sf_setstate(struct ip_mc_list *pmc); | |
169 | static void sf_markstate(struct ip_mc_list *pmc); | |
170 | #endif | |
171 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
172 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
173 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
174 | |
175 | static void ip_ma_put(struct ip_mc_list *im) | |
176 | { | |
8851ab52 | 177 | if (refcount_dec_and_test(&im->refcnt)) { |
1da177e4 | 178 | in_dev_put(im->interface); |
42ea299d | 179 | kfree_rcu(im, rcu); |
1da177e4 LT |
180 | } |
181 | } | |
182 | ||
d9aa9380 DM |
183 | #define for_each_pmc_rcu(in_dev, pmc) \ |
184 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
185 | pmc != NULL; \ | |
186 | pmc = rcu_dereference(pmc->next_rcu)) | |
187 | ||
188 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
189 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
190 | pmc != NULL; \ | |
191 | pmc = rtnl_dereference(pmc->next_rcu)) | |
192 | ||
1da177e4 LT |
193 | #ifdef CONFIG_IP_MULTICAST |
194 | ||
195 | /* | |
196 | * Timer management | |
197 | */ | |
198 | ||
1d7138de | 199 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
200 | { |
201 | spin_lock_bh(&im->lock); | |
202 | if (del_timer(&im->timer)) | |
8851ab52 | 203 | refcount_dec(&im->refcnt); |
a7e9ff73 | 204 | im->tm_running = 0; |
1da177e4 LT |
205 | im->reporter = 0; |
206 | im->unsolicit_count = 0; | |
207 | spin_unlock_bh(&im->lock); | |
208 | } | |
209 | ||
210 | /* It must be called with locked im->lock */ | |
211 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
212 | { | |
63862b5b | 213 | int tv = prandom_u32() % max_delay; |
1da177e4 | 214 | |
a7e9ff73 | 215 | im->tm_running = 1; |
1da177e4 | 216 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
8851ab52 | 217 | refcount_inc(&im->refcnt); |
1da177e4 LT |
218 | } |
219 | ||
220 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
221 | { | |
63862b5b | 222 | int tv = prandom_u32() % in_dev->mr_maxdelay; |
7ababb78 MT |
223 | unsigned long exp = jiffies + tv + 2; |
224 | ||
225 | if (in_dev->mr_gq_running && | |
226 | time_after_eq(exp, (in_dev->mr_gq_timer).expires)) | |
227 | return; | |
1da177e4 LT |
228 | |
229 | in_dev->mr_gq_running = 1; | |
7ababb78 | 230 | if (!mod_timer(&in_dev->mr_gq_timer, exp)) |
1da177e4 LT |
231 | in_dev_hold(in_dev); |
232 | } | |
233 | ||
234 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
235 | { | |
63862b5b | 236 | int tv = prandom_u32() % delay; |
1da177e4 LT |
237 | |
238 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
239 | in_dev_hold(in_dev); | |
240 | } | |
241 | ||
242 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
243 | { | |
244 | spin_lock_bh(&im->lock); | |
245 | im->unsolicit_count = 0; | |
246 | if (del_timer(&im->timer)) { | |
247 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
248 | add_timer(&im->timer); | |
a7e9ff73 | 249 | im->tm_running = 1; |
1da177e4 LT |
250 | spin_unlock_bh(&im->lock); |
251 | return; | |
252 | } | |
8851ab52 | 253 | refcount_dec(&im->refcnt); |
1da177e4 LT |
254 | } |
255 | igmp_start_timer(im, max_delay); | |
256 | spin_unlock_bh(&im->lock); | |
257 | } | |
258 | ||
259 | ||
260 | /* | |
261 | * Send an IGMP report. | |
262 | */ | |
263 | ||
264 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
265 | ||
266 | ||
267 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
268 | int gdeleted, int sdeleted) | |
269 | { | |
270 | switch (type) { | |
271 | case IGMPV3_MODE_IS_INCLUDE: | |
272 | case IGMPV3_MODE_IS_EXCLUDE: | |
273 | if (gdeleted || sdeleted) | |
274 | return 0; | |
ad12583f DS |
275 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
276 | if (pmc->sfmode == MCAST_INCLUDE) | |
277 | return 1; | |
278 | /* don't include if this source is excluded | |
279 | * in all filters | |
280 | */ | |
281 | if (psf->sf_count[MCAST_INCLUDE]) | |
282 | return type == IGMPV3_MODE_IS_INCLUDE; | |
283 | return pmc->sfcount[MCAST_EXCLUDE] == | |
284 | psf->sf_count[MCAST_EXCLUDE]; | |
285 | } | |
286 | return 0; | |
1da177e4 LT |
287 | case IGMPV3_CHANGE_TO_INCLUDE: |
288 | if (gdeleted || sdeleted) | |
289 | return 0; | |
290 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
291 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
292 | if (gdeleted || sdeleted) | |
293 | return 0; | |
294 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
295 | psf->sf_count[MCAST_INCLUDE]) | |
296 | return 0; | |
297 | return pmc->sfcount[MCAST_EXCLUDE] == | |
298 | psf->sf_count[MCAST_EXCLUDE]; | |
299 | case IGMPV3_ALLOW_NEW_SOURCES: | |
300 | if (gdeleted || !psf->sf_crcount) | |
301 | return 0; | |
302 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
303 | case IGMPV3_BLOCK_OLD_SOURCES: | |
304 | if (pmc->sfmode == MCAST_INCLUDE) | |
305 | return gdeleted || (psf->sf_crcount && sdeleted); | |
306 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
307 | } | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static int | |
312 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
313 | { | |
314 | struct ip_sf_list *psf; | |
315 | int scount = 0; | |
316 | ||
c71151f0 | 317 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
318 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
319 | continue; | |
320 | scount++; | |
321 | } | |
322 | return scount; | |
323 | } | |
324 | ||
a46182b0 KC |
325 | /* source address selection per RFC 3376 section 4.2.13 */ |
326 | static __be32 igmpv3_get_srcaddr(struct net_device *dev, | |
327 | const struct flowi4 *fl4) | |
328 | { | |
329 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
330 | ||
331 | if (!in_dev) | |
332 | return htonl(INADDR_ANY); | |
333 | ||
334 | for_ifa(in_dev) { | |
ad23b750 | 335 | if (fl4->saddr == ifa->ifa_local) |
a46182b0 KC |
336 | return fl4->saddr; |
337 | } endfor_ifa(in_dev); | |
338 | ||
339 | return htonl(INADDR_ANY); | |
340 | } | |
341 | ||
4c672e4b | 342 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
1da177e4 LT |
343 | { |
344 | struct sk_buff *skb; | |
345 | struct rtable *rt; | |
346 | struct iphdr *pip; | |
347 | struct igmpv3_report *pig; | |
877acedc | 348 | struct net *net = dev_net(dev); |
31e4543d | 349 | struct flowi4 fl4; |
66088243 HX |
350 | int hlen = LL_RESERVED_SPACE(dev); |
351 | int tlen = dev->needed_tailroom; | |
4c672e4b | 352 | unsigned int size = mtu; |
1da177e4 | 353 | |
57e1ab6e | 354 | while (1) { |
66088243 | 355 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
356 | GFP_ATOMIC | __GFP_NOWARN); |
357 | if (skb) | |
358 | break; | |
359 | size >>= 1; | |
360 | if (size < 256) | |
361 | return NULL; | |
362 | } | |
9d4a0314 | 363 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 364 | |
31e4543d | 365 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
366 | 0, 0, |
367 | IPPROTO_IGMP, 0, dev->ifindex); | |
368 | if (IS_ERR(rt)) { | |
369 | kfree_skb(skb); | |
370 | return NULL; | |
1da177e4 | 371 | } |
1da177e4 | 372 | |
d8d1f30b | 373 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
374 | skb->dev = dev; |
375 | ||
66088243 | 376 | skb_reserve(skb, hlen); |
1837b2e2 | 377 | skb_tailroom_reserve(skb, mtu, tlen); |
1da177e4 | 378 | |
7e28ecc2 | 379 | skb_reset_network_header(skb); |
eddc9ec5 | 380 | pip = ip_hdr(skb); |
7e28ecc2 | 381 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
382 | |
383 | pip->version = 4; | |
384 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
385 | pip->tos = 0xc0; | |
386 | pip->frag_off = htons(IP_DF); | |
387 | pip->ttl = 1; | |
492f64ce | 388 | pip->daddr = fl4.daddr; |
3b4724de ED |
389 | |
390 | rcu_read_lock(); | |
a46182b0 | 391 | pip->saddr = igmpv3_get_srcaddr(dev, &fl4); |
3b4724de ED |
392 | rcu_read_unlock(); |
393 | ||
1da177e4 LT |
394 | pip->protocol = IPPROTO_IGMP; |
395 | pip->tot_len = 0; /* filled in later */ | |
b6a7719a | 396 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
397 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
398 | ((u8 *)&pip[1])[1] = 4; | |
399 | ((u8 *)&pip[1])[2] = 0; | |
400 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 401 | |
b0e380b1 | 402 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 403 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 404 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
405 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
406 | pig->resv1 = 0; | |
407 | pig->csum = 0; | |
408 | pig->resv2 = 0; | |
409 | pig->ngrec = 0; | |
410 | return skb; | |
411 | } | |
412 | ||
413 | static int igmpv3_sendpack(struct sk_buff *skb) | |
414 | { | |
d9edf9e2 | 415 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 416 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 417 | |
d9edf9e2 | 418 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 419 | |
33224b16 | 420 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
1da177e4 LT |
421 | } |
422 | ||
423 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
424 | { | |
a7e9ff73 | 425 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
426 | } |
427 | ||
428 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
b5476022 | 429 | int type, struct igmpv3_grec **ppgr, unsigned int mtu) |
1da177e4 LT |
430 | { |
431 | struct net_device *dev = pmc->interface->dev; | |
432 | struct igmpv3_report *pih; | |
433 | struct igmpv3_grec *pgr; | |
434 | ||
b5476022 ED |
435 | if (!skb) { |
436 | skb = igmpv3_newpack(dev, mtu); | |
437 | if (!skb) | |
438 | return NULL; | |
439 | } | |
4df864c1 | 440 | pgr = skb_put(skb, sizeof(struct igmpv3_grec)); |
1da177e4 LT |
441 | pgr->grec_type = type; |
442 | pgr->grec_auxwords = 0; | |
443 | pgr->grec_nsrcs = 0; | |
444 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 445 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
446 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
447 | *ppgr = pgr; | |
448 | return skb; | |
449 | } | |
450 | ||
4c672e4b | 451 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
452 | |
453 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
454 | int type, int gdeleted, int sdeleted) | |
455 | { | |
456 | struct net_device *dev = pmc->interface->dev; | |
87a8a2ae | 457 | struct net *net = dev_net(dev); |
1da177e4 LT |
458 | struct igmpv3_report *pih; |
459 | struct igmpv3_grec *pgr = NULL; | |
460 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 461 | int scount, stotal, first, isquery, truncate; |
b5476022 | 462 | unsigned int mtu; |
1da177e4 LT |
463 | |
464 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
465 | return skb; | |
87a8a2ae | 466 | if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 467 | return skb; |
1da177e4 | 468 | |
b5476022 ED |
469 | mtu = READ_ONCE(dev->mtu); |
470 | if (mtu < IPV4_MIN_MTU) | |
471 | return skb; | |
472 | ||
1da177e4 LT |
473 | isquery = type == IGMPV3_MODE_IS_INCLUDE || |
474 | type == IGMPV3_MODE_IS_EXCLUDE; | |
475 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
476 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
477 | ||
ad12583f DS |
478 | stotal = scount = 0; |
479 | ||
1da177e4 LT |
480 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
481 | ||
ad12583f DS |
482 | if (!*psf_list) |
483 | goto empty_source; | |
484 | ||
d9edf9e2 | 485 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
486 | |
487 | /* EX and TO_EX get a fresh packet, if needed */ | |
488 | if (truncate) { | |
489 | if (pih && pih->ngrec && | |
490 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
491 | if (skb) | |
492 | igmpv3_sendpack(skb); | |
b5476022 | 493 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
494 | } |
495 | } | |
496 | first = 1; | |
1da177e4 | 497 | psf_prev = NULL; |
c71151f0 | 498 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 499 | __be32 *psrc; |
1da177e4 LT |
500 | |
501 | psf_next = psf->sf_next; | |
502 | ||
503 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
504 | psf_prev = psf; | |
505 | continue; | |
506 | } | |
507 | ||
a052517a HL |
508 | /* Based on RFC3376 5.1. Should not send source-list change |
509 | * records when there is a filter mode change. | |
510 | */ | |
511 | if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || | |
512 | (!gdeleted && pmc->crcount)) && | |
513 | (type == IGMPV3_ALLOW_NEW_SOURCES || | |
514 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) | |
515 | goto decrease_sf_crcount; | |
516 | ||
1da177e4 LT |
517 | /* clear marks on query responses */ |
518 | if (isquery) | |
519 | psf->sf_gsresp = 0; | |
520 | ||
63007727 | 521 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
522 | first*sizeof(struct igmpv3_grec)) { |
523 | if (truncate && !first) | |
524 | break; /* truncate these */ | |
525 | if (pgr) | |
526 | pgr->grec_nsrcs = htons(scount); | |
527 | if (skb) | |
528 | igmpv3_sendpack(skb); | |
b5476022 | 529 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
530 | first = 1; |
531 | scount = 0; | |
532 | } | |
533 | if (first) { | |
b5476022 | 534 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
1da177e4 LT |
535 | first = 0; |
536 | } | |
cc63f70b AD |
537 | if (!skb) |
538 | return NULL; | |
4df864c1 | 539 | psrc = skb_put(skb, sizeof(__be32)); |
1da177e4 | 540 | *psrc = psf->sf_inaddr; |
ad12583f | 541 | scount++; stotal++; |
1da177e4 LT |
542 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
543 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
a052517a | 544 | decrease_sf_crcount: |
1da177e4 LT |
545 | psf->sf_crcount--; |
546 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
547 | if (psf_prev) | |
548 | psf_prev->sf_next = psf->sf_next; | |
549 | else | |
550 | *psf_list = psf->sf_next; | |
551 | kfree(psf); | |
552 | continue; | |
553 | } | |
554 | } | |
555 | psf_prev = psf; | |
556 | } | |
ad12583f DS |
557 | |
558 | empty_source: | |
559 | if (!stotal) { | |
560 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
561 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
562 | return skb; | |
563 | if (pmc->crcount || isquery) { | |
564 | /* make sure we have room for group header */ | |
c71151f0 | 565 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
566 | igmpv3_sendpack(skb); |
567 | skb = NULL; /* add_grhead will get a new one */ | |
568 | } | |
b5476022 | 569 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
ad12583f DS |
570 | } |
571 | } | |
1da177e4 LT |
572 | if (pgr) |
573 | pgr->grec_nsrcs = htons(scount); | |
574 | ||
575 | if (isquery) | |
576 | pmc->gsquery = 0; /* clear query state on report */ | |
577 | return skb; | |
578 | } | |
579 | ||
580 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
581 | { | |
582 | struct sk_buff *skb = NULL; | |
87a8a2ae | 583 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
584 | int type; |
585 | ||
586 | if (!pmc) { | |
1d7138de ED |
587 | rcu_read_lock(); |
588 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
589 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
590 | continue; | |
df2cf4a7 | 591 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
87a8a2ae | 592 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 593 | continue; |
1da177e4 LT |
594 | spin_lock_bh(&pmc->lock); |
595 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
596 | type = IGMPV3_MODE_IS_EXCLUDE; | |
597 | else | |
598 | type = IGMPV3_MODE_IS_INCLUDE; | |
599 | skb = add_grec(skb, pmc, type, 0, 0); | |
600 | spin_unlock_bh(&pmc->lock); | |
601 | } | |
1d7138de | 602 | rcu_read_unlock(); |
1da177e4 LT |
603 | } else { |
604 | spin_lock_bh(&pmc->lock); | |
605 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
606 | type = IGMPV3_MODE_IS_EXCLUDE; | |
607 | else | |
608 | type = IGMPV3_MODE_IS_INCLUDE; | |
609 | skb = add_grec(skb, pmc, type, 0, 0); | |
610 | spin_unlock_bh(&pmc->lock); | |
611 | } | |
612 | if (!skb) | |
613 | return 0; | |
614 | return igmpv3_sendpack(skb); | |
615 | } | |
616 | ||
617 | /* | |
618 | * remove zero-count source records from a source filter list | |
619 | */ | |
620 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
621 | { | |
622 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
623 | ||
624 | psf_prev = NULL; | |
c71151f0 | 625 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
626 | psf_next = psf->sf_next; |
627 | if (psf->sf_crcount == 0) { | |
628 | if (psf_prev) | |
629 | psf_prev->sf_next = psf->sf_next; | |
630 | else | |
631 | *ppsf = psf->sf_next; | |
632 | kfree(psf); | |
633 | } else | |
634 | psf_prev = psf; | |
635 | } | |
636 | } | |
637 | ||
638 | static void igmpv3_send_cr(struct in_device *in_dev) | |
639 | { | |
640 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
641 | struct sk_buff *skb = NULL; | |
642 | int type, dtype; | |
643 | ||
1d7138de | 644 | rcu_read_lock(); |
1da177e4 LT |
645 | spin_lock_bh(&in_dev->mc_tomb_lock); |
646 | ||
647 | /* deleted MCA's */ | |
648 | pmc_prev = NULL; | |
c71151f0 | 649 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
650 | pmc_next = pmc->next; |
651 | if (pmc->sfmode == MCAST_INCLUDE) { | |
652 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
653 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
654 | skb = add_grec(skb, pmc, type, 1, 0); | |
655 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
656 | } | |
657 | if (pmc->crcount) { | |
1da177e4 LT |
658 | if (pmc->sfmode == MCAST_EXCLUDE) { |
659 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
660 | skb = add_grec(skb, pmc, type, 1, 0); | |
661 | } | |
ad12583f | 662 | pmc->crcount--; |
1da177e4 LT |
663 | if (pmc->crcount == 0) { |
664 | igmpv3_clear_zeros(&pmc->tomb); | |
665 | igmpv3_clear_zeros(&pmc->sources); | |
666 | } | |
667 | } | |
668 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
669 | if (pmc_prev) | |
670 | pmc_prev->next = pmc_next; | |
671 | else | |
672 | in_dev->mc_tomb = pmc_next; | |
673 | in_dev_put(pmc->interface); | |
674 | kfree(pmc); | |
675 | } else | |
676 | pmc_prev = pmc; | |
677 | } | |
678 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
679 | ||
680 | /* change recs */ | |
1d7138de | 681 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
682 | spin_lock_bh(&pmc->lock); |
683 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
684 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
685 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
686 | } else { | |
687 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
688 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
689 | } | |
690 | skb = add_grec(skb, pmc, type, 0, 0); | |
691 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
692 | ||
693 | /* filter mode changes */ | |
694 | if (pmc->crcount) { | |
1da177e4 LT |
695 | if (pmc->sfmode == MCAST_EXCLUDE) |
696 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
697 | else | |
698 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
699 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 700 | pmc->crcount--; |
1da177e4 LT |
701 | } |
702 | spin_unlock_bh(&pmc->lock); | |
703 | } | |
1d7138de | 704 | rcu_read_unlock(); |
1da177e4 LT |
705 | |
706 | if (!skb) | |
707 | return; | |
708 | (void) igmpv3_sendpack(skb); | |
709 | } | |
710 | ||
711 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
712 | int type) | |
713 | { | |
714 | struct sk_buff *skb; | |
715 | struct iphdr *iph; | |
716 | struct igmphdr *ih; | |
717 | struct rtable *rt; | |
718 | struct net_device *dev = in_dev->dev; | |
877acedc | 719 | struct net *net = dev_net(dev); |
63007727 | 720 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 721 | struct flowi4 fl4; |
63007727 | 722 | __be32 dst; |
66088243 | 723 | int hlen, tlen; |
1da177e4 LT |
724 | |
725 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
726 | return igmpv3_send_report(in_dev, pmc); | |
df2cf4a7 | 727 | |
87a8a2ae | 728 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 PD |
729 | return 0; |
730 | ||
731 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
1da177e4 LT |
732 | dst = IGMP_ALL_ROUTER; |
733 | else | |
734 | dst = group; | |
735 | ||
31e4543d | 736 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
737 | 0, 0, |
738 | IPPROTO_IGMP, 0, dev->ifindex); | |
739 | if (IS_ERR(rt)) | |
740 | return -1; | |
741 | ||
66088243 HX |
742 | hlen = LL_RESERVED_SPACE(dev); |
743 | tlen = dev->needed_tailroom; | |
744 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
51456b29 | 745 | if (!skb) { |
1da177e4 LT |
746 | ip_rt_put(rt); |
747 | return -1; | |
748 | } | |
9d4a0314 | 749 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 750 | |
d8d1f30b | 751 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 752 | |
66088243 | 753 | skb_reserve(skb, hlen); |
1da177e4 | 754 | |
7e28ecc2 | 755 | skb_reset_network_header(skb); |
eddc9ec5 | 756 | iph = ip_hdr(skb); |
7e28ecc2 | 757 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
758 | |
759 | iph->version = 4; | |
760 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
761 | iph->tos = 0xc0; | |
762 | iph->frag_off = htons(IP_DF); | |
763 | iph->ttl = 1; | |
764 | iph->daddr = dst; | |
492f64ce | 765 | iph->saddr = fl4.saddr; |
1da177e4 | 766 | iph->protocol = IPPROTO_IGMP; |
b6a7719a | 767 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
768 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
769 | ((u8 *)&iph[1])[1] = 4; | |
770 | ((u8 *)&iph[1])[2] = 0; | |
771 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 | 772 | |
4df864c1 | 773 | ih = skb_put(skb, sizeof(struct igmphdr)); |
a7e9ff73 JK |
774 | ih->type = type; |
775 | ih->code = 0; | |
776 | ih->csum = 0; | |
777 | ih->group = group; | |
778 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 779 | |
33224b16 | 780 | return ip_local_out(net, skb->sk, skb); |
1da177e4 LT |
781 | } |
782 | ||
e99e88a9 | 783 | static void igmp_gq_timer_expire(struct timer_list *t) |
1da177e4 | 784 | { |
e99e88a9 | 785 | struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer); |
1da177e4 LT |
786 | |
787 | in_dev->mr_gq_running = 0; | |
788 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 789 | in_dev_put(in_dev); |
1da177e4 LT |
790 | } |
791 | ||
e99e88a9 | 792 | static void igmp_ifc_timer_expire(struct timer_list *t) |
1da177e4 | 793 | { |
e99e88a9 | 794 | struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer); |
1da177e4 LT |
795 | |
796 | igmpv3_send_cr(in_dev); | |
797 | if (in_dev->mr_ifc_count) { | |
798 | in_dev->mr_ifc_count--; | |
cab70040 WM |
799 | igmp_ifc_start_timer(in_dev, |
800 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 801 | } |
e2401654 | 802 | in_dev_put(in_dev); |
1da177e4 LT |
803 | } |
804 | ||
805 | static void igmp_ifc_event(struct in_device *in_dev) | |
806 | { | |
165094af | 807 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
808 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
809 | return; | |
165094af | 810 | in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
811 | igmp_ifc_start_timer(in_dev, 1); |
812 | } | |
813 | ||
814 | ||
e99e88a9 | 815 | static void igmp_timer_expire(struct timer_list *t) |
1da177e4 | 816 | { |
e99e88a9 | 817 | struct ip_mc_list *im = from_timer(im, t, timer); |
1da177e4 LT |
818 | struct in_device *in_dev = im->interface; |
819 | ||
820 | spin_lock(&im->lock); | |
a7e9ff73 | 821 | im->tm_running = 0; |
1da177e4 LT |
822 | |
823 | if (im->unsolicit_count) { | |
824 | im->unsolicit_count--; | |
cab70040 | 825 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
1da177e4 LT |
826 | } |
827 | im->reporter = 1; | |
828 | spin_unlock(&im->lock); | |
829 | ||
830 | if (IGMP_V1_SEEN(in_dev)) | |
831 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
832 | else if (IGMP_V2_SEEN(in_dev)) | |
833 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
834 | else | |
835 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
836 | ||
837 | ip_ma_put(im); | |
838 | } | |
839 | ||
ad12583f | 840 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 841 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
842 | { |
843 | struct ip_sf_list *psf; | |
844 | int i, scount; | |
845 | ||
ad12583f | 846 | scount = 0; |
c71151f0 | 847 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
848 | if (scount == nsrcs) |
849 | break; | |
c71151f0 | 850 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 851 | /* skip inactive filters */ |
e05c4ad3 | 852 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
853 | pmc->sfcount[MCAST_EXCLUDE] != |
854 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 855 | break; |
ad12583f DS |
856 | if (srcs[i] == psf->sf_inaddr) { |
857 | scount++; | |
858 | break; | |
859 | } | |
860 | } | |
861 | } | |
862 | pmc->gsquery = 0; | |
863 | if (scount == nsrcs) /* all sources excluded */ | |
864 | return 0; | |
865 | return 1; | |
866 | } | |
867 | ||
ea4d9e72 | 868 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
869 | { |
870 | struct ip_sf_list *psf; | |
871 | int i, scount; | |
872 | ||
873 | if (pmc->sfmode == MCAST_EXCLUDE) | |
874 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
875 | ||
876 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 877 | scount = 0; |
c71151f0 | 878 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
879 | if (scount == nsrcs) |
880 | break; | |
c71151f0 | 881 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
882 | if (srcs[i] == psf->sf_inaddr) { |
883 | psf->sf_gsresp = 1; | |
884 | scount++; | |
885 | break; | |
886 | } | |
887 | } | |
ad12583f DS |
888 | if (!scount) { |
889 | pmc->gsquery = 0; | |
890 | return 0; | |
891 | } | |
892 | pmc->gsquery = 1; | |
893 | return 1; | |
1da177e4 LT |
894 | } |
895 | ||
d679c532 ED |
896 | /* return true if packet was dropped */ |
897 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
898 | { |
899 | struct ip_mc_list *im; | |
87a8a2ae | 900 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
901 | |
902 | /* Timers are only set for non-local groups */ | |
903 | ||
904 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 905 | return false; |
87a8a2ae | 906 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 907 | return false; |
1da177e4 | 908 | |
1d7138de ED |
909 | rcu_read_lock(); |
910 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
911 | if (im->multiaddr == group) { |
912 | igmp_stop_timer(im); | |
913 | break; | |
914 | } | |
915 | } | |
1d7138de | 916 | rcu_read_unlock(); |
d679c532 | 917 | return false; |
1da177e4 LT |
918 | } |
919 | ||
d679c532 ED |
920 | /* return true if packet was dropped */ |
921 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
922 | int len) |
923 | { | |
d9edf9e2 ACM |
924 | struct igmphdr *ih = igmp_hdr(skb); |
925 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 926 | struct ip_mc_list *im; |
63007727 | 927 | __be32 group = ih->group; |
1da177e4 LT |
928 | int max_delay; |
929 | int mark = 0; | |
87a8a2ae | 930 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
931 | |
932 | ||
5b7c8406 | 933 | if (len == 8) { |
1da177e4 LT |
934 | if (ih->code == 0) { |
935 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 936 | |
436f7c20 | 937 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
1da177e4 | 938 | in_dev->mr_v1_seen = jiffies + |
436f7c20 | 939 | IGMP_V1_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
940 | group = 0; |
941 | } else { | |
942 | /* v2 router present */ | |
943 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
944 | in_dev->mr_v2_seen = jiffies + | |
436f7c20 | 945 | IGMP_V2_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
946 | } |
947 | /* cancel the interface change timer */ | |
948 | in_dev->mr_ifc_count = 0; | |
949 | if (del_timer(&in_dev->mr_ifc_timer)) | |
950 | __in_dev_put(in_dev); | |
951 | /* clear deleted report items */ | |
952 | igmpv3_clear_delrec(in_dev); | |
953 | } else if (len < 12) { | |
d679c532 | 954 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
955 | } else if (IGMP_V1_SEEN(in_dev)) { |
956 | /* This is a v3 query with v1 queriers present */ | |
436f7c20 | 957 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
5b7c8406 DS |
958 | group = 0; |
959 | } else if (IGMP_V2_SEEN(in_dev)) { | |
960 | /* this is a v3 query with v2 queriers present; | |
961 | * Interpretation of the max_delay code is problematic here. | |
962 | * A real v2 host would use ih_code directly, while v3 has a | |
963 | * different encoding. We use the v3 encoding as more likely | |
964 | * to be intended in a v3 query. | |
965 | */ | |
966 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
967 | if (!max_delay) |
968 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
969 | } else { /* v3 */ |
970 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 971 | return true; |
e905a9ed | 972 | |
d9edf9e2 | 973 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 974 | if (ih3->nsrcs) { |
e905a9ed | 975 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 976 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 977 | return true; |
d9edf9e2 | 978 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
979 | } |
980 | ||
981 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
982 | if (!max_delay) | |
983 | max_delay = 1; /* can't mod w/ 0 */ | |
984 | in_dev->mr_maxdelay = max_delay; | |
985 | if (ih3->qrv) | |
986 | in_dev->mr_qrv = ih3->qrv; | |
987 | if (!group) { /* general query */ | |
988 | if (ih3->nsrcs) | |
b47bd8d2 | 989 | return true; /* no sources allowed */ |
1da177e4 | 990 | igmp_gq_start_timer(in_dev); |
d679c532 | 991 | return false; |
1da177e4 LT |
992 | } |
993 | /* mark sources to include, if group & source-specific */ | |
994 | mark = ih3->nsrcs != 0; | |
995 | } | |
996 | ||
997 | /* | |
998 | * - Start the timers in all of our membership records | |
999 | * that the query applies to for the interface on | |
1000 | * which the query arrived excl. those that belong | |
1001 | * to a "local" group (224.0.0.X) | |
1002 | * - For timers already running check if they need to | |
1003 | * be reset. | |
1004 | * - Use the igmp->igmp_code field as the maximum | |
1005 | * delay possible | |
1006 | */ | |
1d7138de ED |
1007 | rcu_read_lock(); |
1008 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
1009 | int changed; |
1010 | ||
1da177e4 LT |
1011 | if (group && group != im->multiaddr) |
1012 | continue; | |
1013 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1014 | continue; | |
df2cf4a7 | 1015 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1016 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1017 | continue; |
1da177e4 LT |
1018 | spin_lock_bh(&im->lock); |
1019 | if (im->tm_running) | |
1020 | im->gsquery = im->gsquery && mark; | |
1021 | else | |
1022 | im->gsquery = mark; | |
ad12583f | 1023 | changed = !im->gsquery || |
e905a9ed | 1024 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 1025 | spin_unlock_bh(&im->lock); |
ad12583f DS |
1026 | if (changed) |
1027 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 1028 | } |
1d7138de | 1029 | rcu_read_unlock(); |
d679c532 | 1030 | return false; |
1da177e4 LT |
1031 | } |
1032 | ||
9a57a9d2 | 1033 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
1034 | int igmp_rcv(struct sk_buff *skb) |
1035 | { | |
1036 | /* This basically follows the spec line by line -- see RFC1112 */ | |
1037 | struct igmphdr *ih; | |
c7b725be DA |
1038 | struct net_device *dev = skb->dev; |
1039 | struct in_device *in_dev; | |
1da177e4 | 1040 | int len = skb->len; |
d679c532 | 1041 | bool dropped = true; |
1da177e4 | 1042 | |
c7b725be DA |
1043 | if (netif_is_l3_master(dev)) { |
1044 | dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif); | |
1045 | if (!dev) | |
1046 | goto drop; | |
1047 | } | |
1048 | ||
1049 | in_dev = __in_dev_get_rcu(dev); | |
51456b29 | 1050 | if (!in_dev) |
cd557bc1 | 1051 | goto drop; |
1da177e4 | 1052 | |
fb286bb2 | 1053 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 1054 | goto drop; |
fb286bb2 | 1055 | |
de08dc1a TH |
1056 | if (skb_checksum_simple_validate(skb)) |
1057 | goto drop; | |
1da177e4 | 1058 | |
d9edf9e2 | 1059 | ih = igmp_hdr(skb); |
1da177e4 LT |
1060 | switch (ih->type) { |
1061 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 1062 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
1063 | break; |
1064 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1065 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 1066 | /* Is it our report looped back? */ |
c7537967 | 1067 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1068 | break; |
24c69275 DS |
1069 | /* don't rely on MC router hearing unicast reports */ |
1070 | if (skb->pkt_type == PACKET_MULTICAST || | |
1071 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1072 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1073 | break; |
1074 | case IGMP_PIM: | |
1075 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1076 | return pim_rcv_v1(skb); |
1077 | #endif | |
c6b471e6 | 1078 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1079 | case IGMP_DVMRP: |
1080 | case IGMP_TRACE: | |
1081 | case IGMP_HOST_LEAVE_MESSAGE: | |
1082 | case IGMP_MTRACE: | |
1083 | case IGMP_MTRACE_RESP: | |
1084 | break; | |
1085 | default: | |
dd1c1853 | 1086 | break; |
1da177e4 | 1087 | } |
fb286bb2 | 1088 | |
cd557bc1 | 1089 | drop: |
d679c532 ED |
1090 | if (dropped) |
1091 | kfree_skb(skb); | |
1092 | else | |
1093 | consume_skb(skb); | |
1da177e4 LT |
1094 | return 0; |
1095 | } | |
1096 | ||
1097 | #endif | |
1098 | ||
1099 | ||
1100 | /* | |
1101 | * Add a filter to a device | |
1102 | */ | |
1103 | ||
63007727 | 1104 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1105 | { |
1106 | char buf[MAX_ADDR_LEN]; | |
1107 | struct net_device *dev = in_dev->dev; | |
1108 | ||
1109 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1110 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1111 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1112 | routine. Something sort of: |
1113 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1114 | --ANK | |
1115 | */ | |
1116 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1117 | dev_mc_add(dev, buf); |
1da177e4 LT |
1118 | } |
1119 | ||
1120 | /* | |
1121 | * Remove a filter from a device | |
1122 | */ | |
1123 | ||
63007727 | 1124 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1125 | { |
1126 | char buf[MAX_ADDR_LEN]; | |
1127 | struct net_device *dev = in_dev->dev; | |
1128 | ||
1129 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1130 | dev_mc_del(dev, buf); |
1da177e4 LT |
1131 | } |
1132 | ||
1133 | #ifdef CONFIG_IP_MULTICAST | |
1134 | /* | |
1135 | * deleted ip_mc_list manipulation | |
1136 | */ | |
1137 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1138 | { | |
1139 | struct ip_mc_list *pmc; | |
165094af | 1140 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1141 | |
1142 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1143 | * are actually used. In particular, the refcnt and users are not | |
1144 | * used for management of the delete list. Using the same structure | |
1145 | * for deleted items allows change reports to use common code with | |
1146 | * non-deleted or query-response MCA's. | |
1147 | */ | |
0da974f4 | 1148 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1149 | if (!pmc) |
1150 | return; | |
b4846fc3 | 1151 | spin_lock_init(&pmc->lock); |
1da177e4 LT |
1152 | spin_lock_bh(&im->lock); |
1153 | pmc->interface = im->interface; | |
1154 | in_dev_hold(in_dev); | |
1155 | pmc->multiaddr = im->multiaddr; | |
165094af | 1156 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1157 | pmc->sfmode = im->sfmode; |
1158 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1159 | struct ip_sf_list *psf; | |
1160 | ||
1161 | pmc->tomb = im->tomb; | |
1162 | pmc->sources = im->sources; | |
1163 | im->tomb = im->sources = NULL; | |
c71151f0 | 1164 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1165 | psf->sf_crcount = pmc->crcount; |
1166 | } | |
1167 | spin_unlock_bh(&im->lock); | |
1168 | ||
1169 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1170 | pmc->next = in_dev->mc_tomb; | |
1171 | in_dev->mc_tomb = pmc; | |
1172 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1173 | } | |
1174 | ||
24803f38 HL |
1175 | /* |
1176 | * restore ip_mc_list deleted records | |
1177 | */ | |
1178 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1da177e4 LT |
1179 | { |
1180 | struct ip_mc_list *pmc, *pmc_prev; | |
24803f38 HL |
1181 | struct ip_sf_list *psf; |
1182 | struct net *net = dev_net(in_dev->dev); | |
1183 | __be32 multiaddr = im->multiaddr; | |
1da177e4 LT |
1184 | |
1185 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1186 | pmc_prev = NULL; | |
c71151f0 | 1187 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1188 | if (pmc->multiaddr == multiaddr) |
1189 | break; | |
1190 | pmc_prev = pmc; | |
1191 | } | |
1192 | if (pmc) { | |
1193 | if (pmc_prev) | |
1194 | pmc_prev->next = pmc->next; | |
1195 | else | |
1196 | in_dev->mc_tomb = pmc->next; | |
1197 | } | |
1198 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
24803f38 HL |
1199 | |
1200 | spin_lock_bh(&im->lock); | |
1da177e4 | 1201 | if (pmc) { |
24803f38 HL |
1202 | im->interface = pmc->interface; |
1203 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
732480cb | 1204 | if (im->sfmode == MCAST_INCLUDE) { |
24803f38 HL |
1205 | im->tomb = pmc->tomb; |
1206 | im->sources = pmc->sources; | |
1207 | for (psf = im->sources; psf; psf = psf->sf_next) | |
1208 | psf->sf_crcount = im->crcount; | |
1da177e4 LT |
1209 | } |
1210 | in_dev_put(pmc->interface); | |
9c8bb163 | 1211 | kfree(pmc); |
1da177e4 | 1212 | } |
24803f38 | 1213 | spin_unlock_bh(&im->lock); |
1da177e4 LT |
1214 | } |
1215 | ||
24803f38 HL |
1216 | /* |
1217 | * flush ip_mc_list deleted records | |
1218 | */ | |
1da177e4 LT |
1219 | static void igmpv3_clear_delrec(struct in_device *in_dev) |
1220 | { | |
1221 | struct ip_mc_list *pmc, *nextpmc; | |
1222 | ||
1223 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1224 | pmc = in_dev->mc_tomb; | |
1225 | in_dev->mc_tomb = NULL; | |
1226 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1227 | ||
1228 | for (; pmc; pmc = nextpmc) { | |
1229 | nextpmc = pmc->next; | |
1230 | ip_mc_clear_src(pmc); | |
1231 | in_dev_put(pmc->interface); | |
1232 | kfree(pmc); | |
1233 | } | |
1234 | /* clear dead sources, too */ | |
1d7138de ED |
1235 | rcu_read_lock(); |
1236 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1237 | struct ip_sf_list *psf, *psf_next; |
1238 | ||
1239 | spin_lock_bh(&pmc->lock); | |
1240 | psf = pmc->tomb; | |
1241 | pmc->tomb = NULL; | |
1242 | spin_unlock_bh(&pmc->lock); | |
c71151f0 | 1243 | for (; psf; psf = psf_next) { |
1da177e4 LT |
1244 | psf_next = psf->sf_next; |
1245 | kfree(psf); | |
1246 | } | |
1247 | } | |
1d7138de | 1248 | rcu_read_unlock(); |
1da177e4 LT |
1249 | } |
1250 | #endif | |
1251 | ||
1252 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1253 | { | |
1254 | struct in_device *in_dev = im->interface; | |
1255 | #ifdef CONFIG_IP_MULTICAST | |
87a8a2ae | 1256 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1257 | int reporter; |
1258 | #endif | |
1259 | ||
1260 | if (im->loaded) { | |
1261 | im->loaded = 0; | |
1262 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1263 | } | |
1264 | ||
1265 | #ifdef CONFIG_IP_MULTICAST | |
1266 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1267 | return; | |
87a8a2ae | 1268 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1269 | return; |
1da177e4 LT |
1270 | |
1271 | reporter = im->reporter; | |
1272 | igmp_stop_timer(im); | |
1273 | ||
1274 | if (!in_dev->dead) { | |
1275 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1276 | return; |
1da177e4 LT |
1277 | if (IGMP_V2_SEEN(in_dev)) { |
1278 | if (reporter) | |
1279 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1280 | return; |
1da177e4 LT |
1281 | } |
1282 | /* IGMPv3 */ | |
1283 | igmpv3_add_delrec(in_dev, im); | |
1284 | ||
1285 | igmp_ifc_event(in_dev); | |
1286 | } | |
1da177e4 | 1287 | #endif |
1da177e4 LT |
1288 | } |
1289 | ||
1290 | static void igmp_group_added(struct ip_mc_list *im) | |
1291 | { | |
1292 | struct in_device *in_dev = im->interface; | |
dcd87999 | 1293 | #ifdef CONFIG_IP_MULTICAST |
87a8a2ae | 1294 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1295 | #endif |
1da177e4 LT |
1296 | |
1297 | if (im->loaded == 0) { | |
1298 | im->loaded = 1; | |
1299 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1300 | } | |
1301 | ||
1302 | #ifdef CONFIG_IP_MULTICAST | |
1303 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1304 | return; | |
87a8a2ae | 1305 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1306 | return; |
1da177e4 LT |
1307 | |
1308 | if (in_dev->dead) | |
1309 | return; | |
1310 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1311 | spin_lock_bh(&im->lock); | |
436f7c20 | 1312 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); |
1da177e4 LT |
1313 | spin_unlock_bh(&im->lock); |
1314 | return; | |
1315 | } | |
1316 | /* else, v3 */ | |
1317 | ||
165094af | 1318 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1319 | igmp_ifc_event(in_dev); |
1320 | #endif | |
1321 | } | |
1322 | ||
1323 | ||
1324 | /* | |
1325 | * Multicast list managers | |
1326 | */ | |
1327 | ||
e9897071 ED |
1328 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1329 | { | |
c70eba74 | 1330 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1331 | } |
1332 | ||
1333 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1334 | struct ip_mc_list *im) | |
1335 | { | |
1336 | struct ip_mc_list __rcu **mc_hash; | |
1337 | u32 hash; | |
1338 | ||
1339 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1340 | if (mc_hash) { | |
1341 | hash = ip_mc_hash(im); | |
c70eba74 | 1342 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1343 | rcu_assign_pointer(mc_hash[hash], im); |
1344 | return; | |
1345 | } | |
1346 | ||
1347 | /* do not use a hash table for small number of items */ | |
1348 | if (in_dev->mc_count < 4) | |
1349 | return; | |
1350 | ||
1351 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1352 | GFP_KERNEL); | |
1353 | if (!mc_hash) | |
1354 | return; | |
1355 | ||
1356 | for_each_pmc_rtnl(in_dev, im) { | |
1357 | hash = ip_mc_hash(im); | |
c70eba74 | 1358 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1359 | RCU_INIT_POINTER(mc_hash[hash], im); |
1360 | } | |
1361 | ||
1362 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1363 | } | |
1364 | ||
1365 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1366 | struct ip_mc_list *im) | |
1367 | { | |
1368 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1369 | struct ip_mc_list *aux; | |
1370 | ||
1371 | if (!mc_hash) | |
1372 | return; | |
1373 | mc_hash += ip_mc_hash(im); | |
1374 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1375 | mc_hash = &aux->next_hash; | |
1376 | *mc_hash = im->next_hash; | |
1377 | } | |
1378 | ||
1da177e4 LT |
1379 | |
1380 | /* | |
1381 | * A socket has joined a multicast group on device dev. | |
1382 | */ | |
1383 | ||
8f935bbd | 1384 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1385 | { |
1386 | struct ip_mc_list *im; | |
dcd87999 | 1387 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1388 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1389 | #endif |
1da177e4 LT |
1390 | |
1391 | ASSERT_RTNL(); | |
1392 | ||
1d7138de | 1393 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1394 | if (im->multiaddr == addr) { |
1395 | im->users++; | |
1396 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1397 | goto out; | |
1398 | } | |
1399 | } | |
1400 | ||
1d7138de | 1401 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1402 | if (!im) |
1403 | goto out; | |
1404 | ||
a7e9ff73 JK |
1405 | im->users = 1; |
1406 | im->interface = in_dev; | |
1da177e4 | 1407 | in_dev_hold(in_dev); |
a7e9ff73 | 1408 | im->multiaddr = addr; |
1da177e4 LT |
1409 | /* initial mode is (EX, empty) */ |
1410 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1411 | im->sfcount[MCAST_EXCLUDE] = 1; |
8851ab52 | 1412 | refcount_set(&im->refcnt, 1); |
1da177e4 LT |
1413 | spin_lock_init(&im->lock); |
1414 | #ifdef CONFIG_IP_MULTICAST | |
e99e88a9 | 1415 | timer_setup(&im->timer, igmp_timer_expire, 0); |
165094af | 1416 | im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1417 | #endif |
1d7138de ED |
1418 | |
1419 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1420 | in_dev->mc_count++; |
cf778b00 | 1421 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1422 | |
e9897071 ED |
1423 | ip_mc_hash_add(in_dev, im); |
1424 | ||
1da177e4 | 1425 | #ifdef CONFIG_IP_MULTICAST |
24803f38 | 1426 | igmpv3_del_delrec(in_dev, im); |
1da177e4 LT |
1427 | #endif |
1428 | igmp_group_added(im); | |
1429 | if (!in_dev->dead) | |
1430 | ip_rt_multicast_event(in_dev); | |
1431 | out: | |
1432 | return; | |
1433 | } | |
4bc2f18b | 1434 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1435 | |
9afd85c9 LL |
1436 | static int ip_mc_check_iphdr(struct sk_buff *skb) |
1437 | { | |
1438 | const struct iphdr *iph; | |
1439 | unsigned int len; | |
1440 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1441 | ||
1442 | if (!pskb_may_pull(skb, offset)) | |
1443 | return -EINVAL; | |
1444 | ||
1445 | iph = ip_hdr(skb); | |
1446 | ||
1447 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1448 | return -EINVAL; | |
1449 | ||
1450 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1451 | ||
1452 | if (!pskb_may_pull(skb, offset)) | |
1453 | return -EINVAL; | |
1454 | ||
1455 | iph = ip_hdr(skb); | |
1456 | ||
1457 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1458 | return -EINVAL; | |
1459 | ||
1460 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1461 | if (skb->len < len || len < offset) | |
1462 | return -EINVAL; | |
1463 | ||
1464 | skb_set_transport_header(skb, offset); | |
1465 | ||
1466 | return 0; | |
1467 | } | |
1468 | ||
1469 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1470 | { | |
1471 | unsigned int len = skb_transport_offset(skb); | |
1472 | ||
1473 | len += sizeof(struct igmpv3_report); | |
1474 | ||
1475 | return pskb_may_pull(skb, len) ? 0 : -EINVAL; | |
1476 | } | |
1477 | ||
1478 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1479 | { | |
1480 | unsigned int len = skb_transport_offset(skb); | |
1481 | ||
1482 | len += sizeof(struct igmphdr); | |
1483 | if (skb->len < len) | |
1484 | return -EINVAL; | |
1485 | ||
1486 | /* IGMPv{1,2}? */ | |
1487 | if (skb->len != len) { | |
1488 | /* or IGMPv3? */ | |
1489 | len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); | |
1490 | if (skb->len < len || !pskb_may_pull(skb, len)) | |
1491 | return -EINVAL; | |
1492 | } | |
1493 | ||
1494 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1495 | * all-systems destination addresses (224.0.0.1) for general queries | |
1496 | */ | |
1497 | if (!igmp_hdr(skb)->group && | |
1498 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1499 | return -EINVAL; | |
1500 | ||
1501 | return 0; | |
1502 | } | |
1503 | ||
1504 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1505 | { | |
1506 | switch (igmp_hdr(skb)->type) { | |
1507 | case IGMP_HOST_LEAVE_MESSAGE: | |
1508 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1509 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1510 | /* fall through */ | |
1511 | return 0; | |
1512 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1513 | return ip_mc_check_igmp_reportv3(skb); | |
1514 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1515 | return ip_mc_check_igmp_query(skb); | |
1516 | default: | |
1517 | return -ENOMSG; | |
1518 | } | |
1519 | } | |
1520 | ||
1521 | static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) | |
1522 | { | |
1523 | return skb_checksum_simple_validate(skb); | |
1524 | } | |
1525 | ||
1526 | static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1527 | ||
1528 | { | |
1529 | struct sk_buff *skb_chk; | |
1530 | unsigned int transport_len; | |
1531 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); | |
a516993f | 1532 | int ret = -EINVAL; |
9afd85c9 LL |
1533 | |
1534 | transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); | |
1535 | ||
9afd85c9 LL |
1536 | skb_chk = skb_checksum_trimmed(skb, transport_len, |
1537 | ip_mc_validate_checksum); | |
1538 | if (!skb_chk) | |
a516993f | 1539 | goto err; |
9afd85c9 | 1540 | |
a516993f LL |
1541 | if (!pskb_may_pull(skb_chk, len)) |
1542 | goto err; | |
9afd85c9 LL |
1543 | |
1544 | ret = ip_mc_check_igmp_msg(skb_chk); | |
a516993f LL |
1545 | if (ret) |
1546 | goto err; | |
9afd85c9 LL |
1547 | |
1548 | if (skb_trimmed) | |
1549 | *skb_trimmed = skb_chk; | |
a516993f LL |
1550 | /* free now unneeded clone */ |
1551 | else if (skb_chk != skb) | |
9afd85c9 LL |
1552 | kfree_skb(skb_chk); |
1553 | ||
a516993f LL |
1554 | ret = 0; |
1555 | ||
1556 | err: | |
1557 | if (ret && skb_chk && skb_chk != skb) | |
1558 | kfree_skb(skb_chk); | |
1559 | ||
1560 | return ret; | |
9afd85c9 LL |
1561 | } |
1562 | ||
1563 | /** | |
1564 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1565 | * @skb: the skb to validate | |
1566 | * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) | |
1567 | * | |
1568 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
a516993f | 1569 | * skb transport header accordingly and returns zero. |
9afd85c9 LL |
1570 | * |
1571 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1572 | * standard | |
1573 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1574 | * -ENOMEM: A memory allocation failure happened. | |
1575 | * | |
1576 | * Optionally, an skb pointer might be provided via skb_trimmed (or set it | |
1577 | * to NULL): After parsing an IGMP packet successfully it will point to | |
1578 | * an skb which has its tail aligned to the IP packet end. This might | |
1579 | * either be the originally provided skb or a trimmed, cloned version if | |
1580 | * the skb frame had data beyond the IP packet. A cloned skb allows us | |
1581 | * to leave the original skb and its full frame unchanged (which might be | |
1582 | * desirable for layer 2 frame jugglers). | |
1583 | * | |
a516993f LL |
1584 | * Caller needs to set the skb network header and free any returned skb if it |
1585 | * differs from the provided skb. | |
9afd85c9 LL |
1586 | */ |
1587 | int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1588 | { | |
1589 | int ret = ip_mc_check_iphdr(skb); | |
1590 | ||
1591 | if (ret < 0) | |
1592 | return ret; | |
1593 | ||
1594 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1595 | return -ENOMSG; | |
1596 | ||
1597 | return __ip_mc_check_igmp(skb, skb_trimmed); | |
1598 | } | |
1599 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1600 | ||
a816c7c7 | 1601 | /* |
4aa5dee4 | 1602 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1603 | */ |
4aa5dee4 | 1604 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1605 | { |
08882669 | 1606 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1607 | struct ip_mc_list *im; |
1608 | int type; | |
87a8a2ae | 1609 | struct net *net = dev_net(in_dev->dev); |
a816c7c7 | 1610 | |
4aa5dee4 JP |
1611 | ASSERT_RTNL(); |
1612 | ||
1613 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1614 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1615 | continue; | |
df2cf4a7 | 1616 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1617 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1618 | continue; |
a816c7c7 | 1619 | |
866f3b25 ED |
1620 | /* a failover is happening and switches |
1621 | * must be notified immediately | |
1622 | */ | |
1623 | if (IGMP_V1_SEEN(in_dev)) | |
1624 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1625 | else if (IGMP_V2_SEEN(in_dev)) | |
1626 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1627 | else | |
1628 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1629 | igmp_send_report(in_dev, im, type); | |
1630 | } | |
a816c7c7 JV |
1631 | #endif |
1632 | } | |
1633 | ||
1da177e4 LT |
1634 | /* |
1635 | * A socket has left a multicast group on device dev | |
1636 | */ | |
1637 | ||
8f935bbd | 1638 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1639 | { |
1d7138de ED |
1640 | struct ip_mc_list *i; |
1641 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1642 | |
1da177e4 | 1643 | ASSERT_RTNL(); |
e905a9ed | 1644 | |
1d7138de ED |
1645 | for (ip = &in_dev->mc_list; |
1646 | (i = rtnl_dereference(*ip)) != NULL; | |
1647 | ip = &i->next_rcu) { | |
a7e9ff73 | 1648 | if (i->multiaddr == addr) { |
1da177e4 | 1649 | if (--i->users == 0) { |
e9897071 | 1650 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1651 | *ip = i->next_rcu; |
b8bae41e | 1652 | in_dev->mc_count--; |
1da177e4 | 1653 | igmp_group_dropped(i); |
24cf3af3 | 1654 | ip_mc_clear_src(i); |
1da177e4 LT |
1655 | |
1656 | if (!in_dev->dead) | |
1657 | ip_rt_multicast_event(in_dev); | |
1658 | ||
1659 | ip_ma_put(i); | |
1660 | return; | |
1661 | } | |
1662 | break; | |
1663 | } | |
1664 | } | |
1665 | } | |
4bc2f18b | 1666 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1667 | |
75c78500 MS |
1668 | /* Device changing type */ |
1669 | ||
1670 | void ip_mc_unmap(struct in_device *in_dev) | |
1671 | { | |
1d7138de | 1672 | struct ip_mc_list *pmc; |
75c78500 MS |
1673 | |
1674 | ASSERT_RTNL(); | |
1675 | ||
1d7138de ED |
1676 | for_each_pmc_rtnl(in_dev, pmc) |
1677 | igmp_group_dropped(pmc); | |
75c78500 MS |
1678 | } |
1679 | ||
1680 | void ip_mc_remap(struct in_device *in_dev) | |
1681 | { | |
1d7138de | 1682 | struct ip_mc_list *pmc; |
75c78500 MS |
1683 | |
1684 | ASSERT_RTNL(); | |
1685 | ||
24803f38 HL |
1686 | for_each_pmc_rtnl(in_dev, pmc) { |
1687 | #ifdef CONFIG_IP_MULTICAST | |
1688 | igmpv3_del_delrec(in_dev, pmc); | |
1689 | #endif | |
1d7138de | 1690 | igmp_group_added(pmc); |
24803f38 | 1691 | } |
75c78500 MS |
1692 | } |
1693 | ||
1da177e4 LT |
1694 | /* Device going down */ |
1695 | ||
1696 | void ip_mc_down(struct in_device *in_dev) | |
1697 | { | |
1d7138de | 1698 | struct ip_mc_list *pmc; |
1da177e4 LT |
1699 | |
1700 | ASSERT_RTNL(); | |
1701 | ||
1d7138de ED |
1702 | for_each_pmc_rtnl(in_dev, pmc) |
1703 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1704 | |
1705 | #ifdef CONFIG_IP_MULTICAST | |
1706 | in_dev->mr_ifc_count = 0; | |
1707 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1708 | __in_dev_put(in_dev); | |
1709 | in_dev->mr_gq_running = 0; | |
1710 | if (del_timer(&in_dev->mr_gq_timer)) | |
1711 | __in_dev_put(in_dev); | |
1da177e4 LT |
1712 | #endif |
1713 | ||
1714 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1715 | } | |
1716 | ||
1717 | void ip_mc_init_dev(struct in_device *in_dev) | |
1718 | { | |
dcd87999 | 1719 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1720 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1721 | #endif |
1da177e4 LT |
1722 | ASSERT_RTNL(); |
1723 | ||
1da177e4 | 1724 | #ifdef CONFIG_IP_MULTICAST |
e99e88a9 KC |
1725 | timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0); |
1726 | timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0); | |
165094af | 1727 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1728 | #endif |
1729 | ||
1da177e4 LT |
1730 | spin_lock_init(&in_dev->mc_tomb_lock); |
1731 | } | |
1732 | ||
1733 | /* Device going up */ | |
1734 | ||
1735 | void ip_mc_up(struct in_device *in_dev) | |
1736 | { | |
1d7138de | 1737 | struct ip_mc_list *pmc; |
dcd87999 | 1738 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1739 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1740 | #endif |
1da177e4 LT |
1741 | |
1742 | ASSERT_RTNL(); | |
1743 | ||
a9fe8e29 | 1744 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1745 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; |
a9fe8e29 | 1746 | #endif |
1da177e4 LT |
1747 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1748 | ||
24803f38 HL |
1749 | for_each_pmc_rtnl(in_dev, pmc) { |
1750 | #ifdef CONFIG_IP_MULTICAST | |
1751 | igmpv3_del_delrec(in_dev, pmc); | |
1752 | #endif | |
1d7138de | 1753 | igmp_group_added(pmc); |
24803f38 | 1754 | } |
1da177e4 LT |
1755 | } |
1756 | ||
1757 | /* | |
1758 | * Device is about to be destroyed: clean up. | |
1759 | */ | |
1760 | ||
1761 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1762 | { | |
1763 | struct ip_mc_list *i; | |
1764 | ||
1765 | ASSERT_RTNL(); | |
1766 | ||
1767 | /* Deactivate timers */ | |
1768 | ip_mc_down(in_dev); | |
24803f38 HL |
1769 | #ifdef CONFIG_IP_MULTICAST |
1770 | igmpv3_clear_delrec(in_dev); | |
1771 | #endif | |
1da177e4 | 1772 | |
1d7138de ED |
1773 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1774 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1775 | in_dev->mc_count--; |
1da177e4 | 1776 | ip_ma_put(i); |
1da177e4 | 1777 | } |
1da177e4 LT |
1778 | } |
1779 | ||
9e917dca | 1780 | /* RTNL is locked */ |
877acedc | 1781 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1782 | { |
1da177e4 LT |
1783 | struct net_device *dev = NULL; |
1784 | struct in_device *idev = NULL; | |
1785 | ||
1786 | if (imr->imr_ifindex) { | |
877acedc | 1787 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1788 | return idev; |
1789 | } | |
1790 | if (imr->imr_address.s_addr) { | |
9e917dca | 1791 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1792 | if (!dev) |
1793 | return NULL; | |
1da177e4 LT |
1794 | } |
1795 | ||
b23dd4fe | 1796 | if (!dev) { |
78fbfd8a DM |
1797 | struct rtable *rt = ip_route_output(net, |
1798 | imr->imr_multiaddr.s_addr, | |
1799 | 0, 0, 0); | |
b23dd4fe DM |
1800 | if (!IS_ERR(rt)) { |
1801 | dev = rt->dst.dev; | |
1802 | ip_rt_put(rt); | |
1803 | } | |
1da177e4 LT |
1804 | } |
1805 | if (dev) { | |
1806 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1807 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1808 | } |
1809 | return idev; | |
1810 | } | |
1811 | ||
1812 | /* | |
1813 | * Join a socket to a group | |
1814 | */ | |
1da177e4 LT |
1815 | |
1816 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1817 | __be32 *psfsrc) |
1da177e4 LT |
1818 | { |
1819 | struct ip_sf_list *psf, *psf_prev; | |
1820 | int rv = 0; | |
1821 | ||
1822 | psf_prev = NULL; | |
c71151f0 | 1823 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1824 | if (psf->sf_inaddr == *psfsrc) |
1825 | break; | |
1826 | psf_prev = psf; | |
1827 | } | |
1828 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1829 | /* source filter not found, or count wrong => bug */ | |
1830 | return -ESRCH; | |
1831 | } | |
1832 | psf->sf_count[sfmode]--; | |
1833 | if (psf->sf_count[sfmode] == 0) { | |
1834 | ip_rt_multicast_event(pmc->interface); | |
1835 | } | |
1836 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1837 | #ifdef CONFIG_IP_MULTICAST | |
1838 | struct in_device *in_dev = pmc->interface; | |
165094af | 1839 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1840 | #endif |
1841 | ||
1842 | /* no more filters for this source */ | |
1843 | if (psf_prev) | |
1844 | psf_prev->sf_next = psf->sf_next; | |
1845 | else | |
1846 | pmc->sources = psf->sf_next; | |
1847 | #ifdef CONFIG_IP_MULTICAST | |
1848 | if (psf->sf_oldin && | |
1849 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
165094af | 1850 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1851 | psf->sf_next = pmc->tomb; |
1852 | pmc->tomb = psf; | |
1853 | rv = 1; | |
1854 | } else | |
1855 | #endif | |
1856 | kfree(psf); | |
1857 | } | |
1858 | return rv; | |
1859 | } | |
1860 | ||
1861 | #ifndef CONFIG_IP_MULTICAST | |
1862 | #define igmp_ifc_event(x) do { } while (0) | |
1863 | #endif | |
1864 | ||
8f935bbd AV |
1865 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1866 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1867 | { |
1868 | struct ip_mc_list *pmc; | |
1869 | int changerec = 0; | |
1870 | int i, err; | |
1871 | ||
1872 | if (!in_dev) | |
1873 | return -ENODEV; | |
1d7138de ED |
1874 | rcu_read_lock(); |
1875 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1876 | if (*pmca == pmc->multiaddr) |
1877 | break; | |
1878 | } | |
1879 | if (!pmc) { | |
1880 | /* MCA not found?? bug */ | |
1d7138de | 1881 | rcu_read_unlock(); |
1da177e4 LT |
1882 | return -ESRCH; |
1883 | } | |
1884 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1885 | rcu_read_unlock(); |
1da177e4 LT |
1886 | #ifdef CONFIG_IP_MULTICAST |
1887 | sf_markstate(pmc); | |
1888 | #endif | |
1889 | if (!delta) { | |
1890 | err = -EINVAL; | |
1891 | if (!pmc->sfcount[sfmode]) | |
1892 | goto out_unlock; | |
1893 | pmc->sfcount[sfmode]--; | |
1894 | } | |
1895 | err = 0; | |
c71151f0 | 1896 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
1897 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
1898 | ||
1899 | changerec |= rv > 0; | |
1900 | if (!err && rv < 0) | |
1901 | err = rv; | |
1902 | } | |
1903 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1904 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1905 | pmc->sfcount[MCAST_INCLUDE]) { | |
1906 | #ifdef CONFIG_IP_MULTICAST | |
1907 | struct ip_sf_list *psf; | |
165094af | 1908 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1909 | #endif |
1910 | ||
1911 | /* filter mode change */ | |
1912 | pmc->sfmode = MCAST_INCLUDE; | |
1913 | #ifdef CONFIG_IP_MULTICAST | |
165094af | 1914 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1915 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 1916 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1917 | psf->sf_crcount = 0; |
1918 | igmp_ifc_event(pmc->interface); | |
1919 | } else if (sf_setstate(pmc) || changerec) { | |
1920 | igmp_ifc_event(pmc->interface); | |
1921 | #endif | |
1922 | } | |
1923 | out_unlock: | |
1924 | spin_unlock_bh(&pmc->lock); | |
1925 | return err; | |
1926 | } | |
1927 | ||
1928 | /* | |
1929 | * Add multicast single-source filter to the interface list | |
1930 | */ | |
1931 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1932 | __be32 *psfsrc) |
1da177e4 LT |
1933 | { |
1934 | struct ip_sf_list *psf, *psf_prev; | |
1935 | ||
1936 | psf_prev = NULL; | |
c71151f0 | 1937 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1938 | if (psf->sf_inaddr == *psfsrc) |
1939 | break; | |
1940 | psf_prev = psf; | |
1941 | } | |
1942 | if (!psf) { | |
0da974f4 | 1943 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1944 | if (!psf) |
1945 | return -ENOBUFS; | |
1da177e4 LT |
1946 | psf->sf_inaddr = *psfsrc; |
1947 | if (psf_prev) { | |
1948 | psf_prev->sf_next = psf; | |
1949 | } else | |
1950 | pmc->sources = psf; | |
1951 | } | |
1952 | psf->sf_count[sfmode]++; | |
1953 | if (psf->sf_count[sfmode] == 1) { | |
1954 | ip_rt_multicast_event(pmc->interface); | |
1955 | } | |
1956 | return 0; | |
1957 | } | |
1958 | ||
1959 | #ifdef CONFIG_IP_MULTICAST | |
1960 | static void sf_markstate(struct ip_mc_list *pmc) | |
1961 | { | |
1962 | struct ip_sf_list *psf; | |
1963 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1964 | ||
c71151f0 | 1965 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1966 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1967 | psf->sf_oldin = mca_xcount == | |
1968 | psf->sf_count[MCAST_EXCLUDE] && | |
1969 | !psf->sf_count[MCAST_INCLUDE]; | |
1970 | } else | |
1971 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1972 | } | |
1973 | ||
1974 | static int sf_setstate(struct ip_mc_list *pmc) | |
1975 | { | |
ad12583f | 1976 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1977 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1978 | int qrv = pmc->interface->mr_qrv; | |
1979 | int new_in, rv; | |
1980 | ||
1981 | rv = 0; | |
c71151f0 | 1982 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1983 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1984 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1985 | !psf->sf_count[MCAST_INCLUDE]; | |
1986 | } else | |
1987 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1988 | if (new_in) { |
1989 | if (!psf->sf_oldin) { | |
76edc605 | 1990 | struct ip_sf_list *prev = NULL; |
ad12583f | 1991 | |
c71151f0 | 1992 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
1993 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1994 | break; | |
1995 | prev = dpsf; | |
1996 | } | |
1997 | if (dpsf) { | |
1998 | if (prev) | |
1999 | prev->sf_next = dpsf->sf_next; | |
2000 | else | |
2001 | pmc->tomb = dpsf->sf_next; | |
2002 | kfree(dpsf); | |
2003 | } | |
2004 | psf->sf_crcount = qrv; | |
2005 | rv++; | |
2006 | } | |
2007 | } else if (psf->sf_oldin) { | |
2008 | ||
2009 | psf->sf_crcount = 0; | |
2010 | /* | |
2011 | * add or update "delete" records if an active filter | |
2012 | * is now inactive | |
2013 | */ | |
c71151f0 | 2014 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
2015 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
2016 | break; | |
2017 | if (!dpsf) { | |
3ed37a6f | 2018 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
2019 | if (!dpsf) |
2020 | continue; | |
2021 | *dpsf = *psf; | |
2022 | /* pmc->lock held by callers */ | |
2023 | dpsf->sf_next = pmc->tomb; | |
2024 | pmc->tomb = dpsf; | |
2025 | } | |
2026 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
2027 | rv++; |
2028 | } | |
2029 | } | |
2030 | return rv; | |
2031 | } | |
2032 | #endif | |
2033 | ||
2034 | /* | |
2035 | * Add multicast source filter list to the interface list | |
2036 | */ | |
8f935bbd AV |
2037 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
2038 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
2039 | { |
2040 | struct ip_mc_list *pmc; | |
2041 | int isexclude; | |
2042 | int i, err; | |
2043 | ||
2044 | if (!in_dev) | |
2045 | return -ENODEV; | |
1d7138de ED |
2046 | rcu_read_lock(); |
2047 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
2048 | if (*pmca == pmc->multiaddr) |
2049 | break; | |
2050 | } | |
2051 | if (!pmc) { | |
2052 | /* MCA not found?? bug */ | |
1d7138de | 2053 | rcu_read_unlock(); |
1da177e4 LT |
2054 | return -ESRCH; |
2055 | } | |
2056 | spin_lock_bh(&pmc->lock); | |
1d7138de | 2057 | rcu_read_unlock(); |
1da177e4 LT |
2058 | |
2059 | #ifdef CONFIG_IP_MULTICAST | |
2060 | sf_markstate(pmc); | |
2061 | #endif | |
2062 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
2063 | if (!delta) | |
2064 | pmc->sfcount[sfmode]++; | |
2065 | err = 0; | |
c71151f0 | 2066 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 2067 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
2068 | if (err) |
2069 | break; | |
2070 | } | |
2071 | if (err) { | |
2072 | int j; | |
2073 | ||
685f94e6 JZ |
2074 | if (!delta) |
2075 | pmc->sfcount[sfmode]--; | |
c71151f0 | 2076 | for (j = 0; j < i; j++) |
a1889c0d | 2077 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
2078 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
2079 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 2080 | struct ip_sf_list *psf; |
165094af | 2081 | struct net *net = dev_net(pmc->interface->dev); |
cfcabdcc | 2082 | in_dev = pmc->interface; |
1da177e4 LT |
2083 | #endif |
2084 | ||
2085 | /* filter mode change */ | |
2086 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
2087 | pmc->sfmode = MCAST_EXCLUDE; | |
2088 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
2089 | pmc->sfmode = MCAST_INCLUDE; | |
2090 | #ifdef CONFIG_IP_MULTICAST | |
2091 | /* else no filters; keep old mode for reports */ | |
2092 | ||
165094af | 2093 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 2094 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 2095 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2096 | psf->sf_crcount = 0; |
2097 | igmp_ifc_event(in_dev); | |
2098 | } else if (sf_setstate(pmc)) { | |
2099 | igmp_ifc_event(in_dev); | |
2100 | #endif | |
2101 | } | |
2102 | spin_unlock_bh(&pmc->lock); | |
2103 | return err; | |
2104 | } | |
2105 | ||
2106 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
2107 | { | |
c38b7d32 | 2108 | struct ip_sf_list *psf, *nextpsf, *tomb, *sources; |
1da177e4 | 2109 | |
c38b7d32 WC |
2110 | spin_lock_bh(&pmc->lock); |
2111 | tomb = pmc->tomb; | |
2112 | pmc->tomb = NULL; | |
2113 | sources = pmc->sources; | |
2114 | pmc->sources = NULL; | |
2115 | pmc->sfmode = MCAST_EXCLUDE; | |
2116 | pmc->sfcount[MCAST_INCLUDE] = 0; | |
2117 | pmc->sfcount[MCAST_EXCLUDE] = 1; | |
2118 | spin_unlock_bh(&pmc->lock); | |
2119 | ||
2120 | for (psf = tomb; psf; psf = nextpsf) { | |
1da177e4 LT |
2121 | nextpsf = psf->sf_next; |
2122 | kfree(psf); | |
2123 | } | |
c38b7d32 | 2124 | for (psf = sources; psf; psf = nextpsf) { |
1da177e4 LT |
2125 | nextpsf = psf->sf_next; |
2126 | kfree(psf); | |
2127 | } | |
1da177e4 LT |
2128 | } |
2129 | ||
54ff9ef3 MRL |
2130 | /* Join a multicast group |
2131 | */ | |
2132 | ||
2133 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
1da177e4 | 2134 | { |
8f935bbd | 2135 | __be32 addr = imr->imr_multiaddr.s_addr; |
959d10f6 | 2136 | struct ip_mc_socklist *iml, *i; |
1da177e4 LT |
2137 | struct in_device *in_dev; |
2138 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 2139 | struct net *net = sock_net(sk); |
ca9b907d | 2140 | int ifindex; |
1da177e4 | 2141 | int count = 0; |
959d10f6 ED |
2142 | int err; |
2143 | ||
2144 | ASSERT_RTNL(); | |
1da177e4 | 2145 | |
f97c1e0c | 2146 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2147 | return -EINVAL; |
2148 | ||
877acedc | 2149 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
2150 | |
2151 | if (!in_dev) { | |
1da177e4 LT |
2152 | err = -ENODEV; |
2153 | goto done; | |
2154 | } | |
2155 | ||
1da177e4 | 2156 | err = -EADDRINUSE; |
ca9b907d | 2157 | ifindex = imr->imr_ifindex; |
1d7138de | 2158 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
2159 | if (i->multi.imr_multiaddr.s_addr == addr && |
2160 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 2161 | goto done; |
1da177e4 LT |
2162 | count++; |
2163 | } | |
2164 | err = -ENOBUFS; | |
815c5270 | 2165 | if (count >= net->ipv4.sysctl_igmp_max_memberships) |
ca9b907d | 2166 | goto done; |
a7e9ff73 | 2167 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
51456b29 | 2168 | if (!iml) |
1da177e4 | 2169 | goto done; |
ca9b907d | 2170 | |
1da177e4 | 2171 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 2172 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
2173 | iml->sflist = NULL; |
2174 | iml->sfmode = MCAST_EXCLUDE; | |
cf778b00 | 2175 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 2176 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 2177 | err = 0; |
1da177e4 | 2178 | done: |
1da177e4 LT |
2179 | return err; |
2180 | } | |
4bc2f18b | 2181 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
2182 | |
2183 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
2184 | struct in_device *in_dev) | |
2185 | { | |
1d7138de | 2186 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
2187 | int err; |
2188 | ||
51456b29 | 2189 | if (!psf) { |
1da177e4 LT |
2190 | /* any-source empty exclude case */ |
2191 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2192 | iml->sfmode, 0, NULL, 0); | |
2193 | } | |
2194 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 2195 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 2196 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
2197 | /* decrease mem now to avoid the memleak warning */ |
2198 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2199 | kfree_rcu(psf, rcu); |
1da177e4 LT |
2200 | return err; |
2201 | } | |
2202 | ||
54ff9ef3 | 2203 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
1da177e4 LT |
2204 | { |
2205 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
2206 | struct ip_mc_socklist *iml; |
2207 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 2208 | struct in_device *in_dev; |
877acedc | 2209 | struct net *net = sock_net(sk); |
8f935bbd | 2210 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 2211 | u32 ifindex; |
acd6e00b | 2212 | int ret = -EADDRNOTAVAIL; |
1da177e4 | 2213 | |
959d10f6 ED |
2214 | ASSERT_RTNL(); |
2215 | ||
877acedc | 2216 | in_dev = ip_mc_find_dev(net, imr); |
4eba7bb1 | 2217 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
52ad353a | 2218 | ret = -ENODEV; |
2219 | goto out; | |
2220 | } | |
84b42bae | 2221 | ifindex = imr->imr_ifindex; |
1d7138de ED |
2222 | for (imlp = &inet->mc_list; |
2223 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2224 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
2225 | if (iml->multi.imr_multiaddr.s_addr != group) |
2226 | continue; | |
2227 | if (ifindex) { | |
2228 | if (iml->multi.imr_ifindex != ifindex) | |
2229 | continue; | |
2230 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2231 | iml->multi.imr_address.s_addr) | |
2232 | continue; | |
1da177e4 | 2233 | |
acd6e00b | 2234 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 2235 | |
1d7138de | 2236 | *imlp = iml->next_rcu; |
acd6e00b | 2237 | |
4eba7bb1 AL |
2238 | if (in_dev) |
2239 | ip_mc_dec_group(in_dev, group); | |
959d10f6 | 2240 | |
c85bb41e FL |
2241 | /* decrease mem now to avoid the memleak warning */ |
2242 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2243 | kfree_rcu(iml, rcu); |
acd6e00b | 2244 | return 0; |
1da177e4 | 2245 | } |
52ad353a | 2246 | out: |
959d10f6 ED |
2247 | return ret; |
2248 | } | |
193ba924 | 2249 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
2250 | |
2251 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2252 | ip_mreq_source *mreqs, int ifindex) | |
2253 | { | |
2254 | int err; | |
2255 | struct ip_mreqn imr; | |
63007727 | 2256 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
2257 | struct ip_mc_socklist *pmc; |
2258 | struct in_device *in_dev = NULL; | |
2259 | struct inet_sock *inet = inet_sk(sk); | |
2260 | struct ip_sf_socklist *psl; | |
877acedc | 2261 | struct net *net = sock_net(sk); |
8cdaaa15 | 2262 | int leavegroup = 0; |
1da177e4 LT |
2263 | int i, j, rv; |
2264 | ||
f97c1e0c | 2265 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2266 | return -EINVAL; |
2267 | ||
54ff9ef3 | 2268 | ASSERT_RTNL(); |
1da177e4 LT |
2269 | |
2270 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2271 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2272 | imr.imr_ifindex = ifindex; | |
877acedc | 2273 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2274 | |
2275 | if (!in_dev) { | |
2276 | err = -ENODEV; | |
2277 | goto done; | |
2278 | } | |
2279 | err = -EADDRNOTAVAIL; | |
2280 | ||
1d7138de | 2281 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2282 | if ((pmc->multi.imr_multiaddr.s_addr == |
2283 | imr.imr_multiaddr.s_addr) && | |
2284 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2285 | break; |
2286 | } | |
917f2f10 DS |
2287 | if (!pmc) { /* must have a prior join */ |
2288 | err = -EINVAL; | |
1da177e4 | 2289 | goto done; |
917f2f10 | 2290 | } |
1da177e4 LT |
2291 | /* if a source filter was set, must be the same mode as before */ |
2292 | if (pmc->sflist) { | |
917f2f10 DS |
2293 | if (pmc->sfmode != omode) { |
2294 | err = -EINVAL; | |
1da177e4 | 2295 | goto done; |
917f2f10 | 2296 | } |
1da177e4 LT |
2297 | } else if (pmc->sfmode != omode) { |
2298 | /* allow mode switches for empty-set filters */ | |
2299 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2300 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2301 | NULL, 0); |
2302 | pmc->sfmode = omode; | |
2303 | } | |
2304 | ||
1d7138de | 2305 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2306 | if (!add) { |
2307 | if (!psl) | |
917f2f10 | 2308 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2309 | rv = !0; |
c71151f0 | 2310 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2311 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2312 | sizeof(__be32)); |
1da177e4 LT |
2313 | if (rv == 0) |
2314 | break; | |
2315 | } | |
2316 | if (rv) /* source not found */ | |
917f2f10 | 2317 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2318 | |
8cdaaa15 DS |
2319 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2320 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2321 | leavegroup = 1; | |
2322 | goto done; | |
2323 | } | |
2324 | ||
1da177e4 | 2325 | /* update the interface filter */ |
e905a9ed | 2326 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2327 | &mreqs->imr_sourceaddr, 1); |
2328 | ||
c71151f0 | 2329 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2330 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2331 | psl->sl_count--; | |
2332 | err = 0; | |
2333 | goto done; | |
2334 | } | |
2335 | /* else, add a new source to the filter */ | |
2336 | ||
166b6b2d | 2337 | if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { |
1da177e4 LT |
2338 | err = -ENOBUFS; |
2339 | goto done; | |
2340 | } | |
2341 | if (!psl || psl->sl_count == psl->sl_max) { | |
2342 | struct ip_sf_socklist *newpsl; | |
2343 | int count = IP_SFBLOCK; | |
2344 | ||
2345 | if (psl) | |
2346 | count += psl->sl_max; | |
8b3a7005 | 2347 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2348 | if (!newpsl) { |
2349 | err = -ENOBUFS; | |
2350 | goto done; | |
2351 | } | |
2352 | newpsl->sl_max = count; | |
2353 | newpsl->sl_count = count - IP_SFBLOCK; | |
2354 | if (psl) { | |
c71151f0 | 2355 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2356 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e FL |
2357 | /* decrease mem now to avoid the memleak warning */ |
2358 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2359 | kfree_rcu(psl, rcu); |
1da177e4 | 2360 | } |
cf778b00 | 2361 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2362 | psl = newpsl; |
1da177e4 LT |
2363 | } |
2364 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2365 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2366 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2367 | sizeof(__be32)); |
1da177e4 LT |
2368 | if (rv == 0) |
2369 | break; | |
2370 | } | |
2371 | if (rv == 0) /* address already there is an error */ | |
2372 | goto done; | |
c71151f0 | 2373 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2374 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2375 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2376 | psl->sl_count++; | |
2377 | err = 0; | |
2378 | /* update the interface list */ | |
e905a9ed | 2379 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2380 | &mreqs->imr_sourceaddr, 1); |
2381 | done: | |
8cdaaa15 | 2382 | if (leavegroup) |
54ff9ef3 | 2383 | err = ip_mc_leave_group(sk, &imr); |
1da177e4 LT |
2384 | return err; |
2385 | } | |
2386 | ||
2387 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2388 | { | |
9951f036 | 2389 | int err = 0; |
1da177e4 | 2390 | struct ip_mreqn imr; |
63007727 | 2391 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2392 | struct ip_mc_socklist *pmc; |
2393 | struct in_device *in_dev; | |
2394 | struct inet_sock *inet = inet_sk(sk); | |
2395 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2396 | struct net *net = sock_net(sk); |
9951f036 | 2397 | int leavegroup = 0; |
1da177e4 | 2398 | |
f97c1e0c | 2399 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2400 | return -EINVAL; |
2401 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2402 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2403 | return -EINVAL; | |
2404 | ||
54ff9ef3 | 2405 | ASSERT_RTNL(); |
1da177e4 LT |
2406 | |
2407 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2408 | imr.imr_address.s_addr = msf->imsf_interface; | |
2409 | imr.imr_ifindex = ifindex; | |
877acedc | 2410 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2411 | |
2412 | if (!in_dev) { | |
2413 | err = -ENODEV; | |
2414 | goto done; | |
2415 | } | |
1da177e4 | 2416 | |
9951f036 DS |
2417 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2418 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2419 | leavegroup = 1; | |
2420 | goto done; | |
2421 | } | |
2422 | ||
1d7138de | 2423 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2424 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2425 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2426 | break; | |
2427 | } | |
917f2f10 DS |
2428 | if (!pmc) { /* must have a prior join */ |
2429 | err = -EINVAL; | |
1da177e4 | 2430 | goto done; |
917f2f10 | 2431 | } |
1da177e4 | 2432 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2433 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2434 | GFP_KERNEL); | |
1da177e4 LT |
2435 | if (!newpsl) { |
2436 | err = -ENOBUFS; | |
2437 | goto done; | |
2438 | } | |
2439 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2440 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2441 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2442 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2443 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2444 | if (err) { | |
2445 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2446 | goto done; | |
2447 | } | |
8713dbf0 | 2448 | } else { |
1da177e4 | 2449 | newpsl = NULL; |
8713dbf0 YZ |
2450 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2451 | msf->imsf_fmode, 0, NULL, 0); | |
2452 | } | |
1d7138de | 2453 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2454 | if (psl) { |
2455 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2456 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2457 | /* decrease mem now to avoid the memleak warning */ |
2458 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2459 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2460 | } else |
2461 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2462 | 0, NULL, 0); | |
cf778b00 | 2463 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2464 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2465 | err = 0; |
1da177e4 | 2466 | done: |
9951f036 DS |
2467 | if (leavegroup) |
2468 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2469 | return err; |
2470 | } | |
2471 | ||
2472 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2473 | struct ip_msfilter __user *optval, int __user *optlen) | |
2474 | { | |
2475 | int err, len, count, copycount; | |
2476 | struct ip_mreqn imr; | |
63007727 | 2477 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2478 | struct ip_mc_socklist *pmc; |
2479 | struct in_device *in_dev; | |
2480 | struct inet_sock *inet = inet_sk(sk); | |
2481 | struct ip_sf_socklist *psl; | |
877acedc | 2482 | struct net *net = sock_net(sk); |
1da177e4 | 2483 | |
87e9f031 WC |
2484 | ASSERT_RTNL(); |
2485 | ||
f97c1e0c | 2486 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2487 | return -EINVAL; |
2488 | ||
1da177e4 LT |
2489 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
2490 | imr.imr_address.s_addr = msf->imsf_interface; | |
2491 | imr.imr_ifindex = 0; | |
877acedc | 2492 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2493 | |
2494 | if (!in_dev) { | |
2495 | err = -ENODEV; | |
2496 | goto done; | |
2497 | } | |
2498 | err = -EADDRNOTAVAIL; | |
2499 | ||
1d7138de | 2500 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2501 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2502 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2503 | break; | |
2504 | } | |
2505 | if (!pmc) /* must have a prior join */ | |
2506 | goto done; | |
2507 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2508 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2509 | if (!psl) { |
2510 | len = 0; | |
2511 | count = 0; | |
2512 | } else { | |
2513 | count = psl->sl_count; | |
2514 | } | |
2515 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2516 | len = copycount * sizeof(psl->sl_addr[0]); | |
2517 | msf->imsf_numsrc = count; | |
2518 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2519 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2520 | return -EFAULT; | |
2521 | } | |
2522 | if (len && | |
2523 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2524 | return -EFAULT; | |
2525 | return 0; | |
2526 | done: | |
1da177e4 LT |
2527 | return err; |
2528 | } | |
2529 | ||
2530 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2531 | struct group_filter __user *optval, int __user *optlen) | |
2532 | { | |
2533 | int err, i, count, copycount; | |
2534 | struct sockaddr_in *psin; | |
63007727 | 2535 | __be32 addr; |
1da177e4 LT |
2536 | struct ip_mc_socklist *pmc; |
2537 | struct inet_sock *inet = inet_sk(sk); | |
2538 | struct ip_sf_socklist *psl; | |
2539 | ||
87e9f031 WC |
2540 | ASSERT_RTNL(); |
2541 | ||
1da177e4 LT |
2542 | psin = (struct sockaddr_in *)&gsf->gf_group; |
2543 | if (psin->sin_family != AF_INET) | |
2544 | return -EINVAL; | |
2545 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2546 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2547 | return -EINVAL; |
2548 | ||
1da177e4 LT |
2549 | err = -EADDRNOTAVAIL; |
2550 | ||
1d7138de | 2551 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2552 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2553 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2554 | break; | |
2555 | } | |
2556 | if (!pmc) /* must have a prior join */ | |
2557 | goto done; | |
2558 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2559 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2560 | count = psl ? psl->sl_count : 0; |
2561 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2562 | gsf->gf_numsrc = count; | |
2563 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2564 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2565 | return -EFAULT; | |
2566 | } | |
c71151f0 | 2567 | for (i = 0; i < copycount; i++) { |
1da177e4 LT |
2568 | struct sockaddr_storage ss; |
2569 | ||
2570 | psin = (struct sockaddr_in *)&ss; | |
2571 | memset(&ss, 0, sizeof(ss)); | |
2572 | psin->sin_family = AF_INET; | |
2573 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2574 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2575 | return -EFAULT; | |
2576 | } | |
2577 | return 0; | |
2578 | done: | |
1da177e4 LT |
2579 | return err; |
2580 | } | |
2581 | ||
2582 | /* | |
2583 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2584 | */ | |
60d9b031 DA |
2585 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, |
2586 | int dif, int sdif) | |
1da177e4 LT |
2587 | { |
2588 | struct inet_sock *inet = inet_sk(sk); | |
2589 | struct ip_mc_socklist *pmc; | |
2590 | struct ip_sf_socklist *psl; | |
2591 | int i; | |
c85bb41e | 2592 | int ret; |
1da177e4 | 2593 | |
c85bb41e | 2594 | ret = 1; |
f97c1e0c | 2595 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2596 | goto out; |
1da177e4 | 2597 | |
c85bb41e | 2598 | rcu_read_lock(); |
1d7138de | 2599 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 | 2600 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
60d9b031 DA |
2601 | (pmc->multi.imr_ifindex == dif || |
2602 | (sdif && pmc->multi.imr_ifindex == sdif))) | |
1da177e4 LT |
2603 | break; |
2604 | } | |
c85bb41e | 2605 | ret = inet->mc_all; |
1da177e4 | 2606 | if (!pmc) |
c85bb41e | 2607 | goto unlock; |
1d7138de | 2608 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2609 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2610 | if (!psl) |
c85bb41e | 2611 | goto unlock; |
1da177e4 | 2612 | |
c71151f0 | 2613 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2614 | if (psl->sl_addr[i] == rmt_addr) |
2615 | break; | |
2616 | } | |
c85bb41e | 2617 | ret = 0; |
1da177e4 | 2618 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2619 | goto unlock; |
1da177e4 | 2620 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2621 | goto unlock; |
2622 | ret = 1; | |
2623 | unlock: | |
2624 | rcu_read_unlock(); | |
2625 | out: | |
2626 | return ret; | |
1da177e4 LT |
2627 | } |
2628 | ||
2629 | /* | |
2630 | * A socket is closing. | |
2631 | */ | |
2632 | ||
2633 | void ip_mc_drop_socket(struct sock *sk) | |
2634 | { | |
2635 | struct inet_sock *inet = inet_sk(sk); | |
2636 | struct ip_mc_socklist *iml; | |
877acedc | 2637 | struct net *net = sock_net(sk); |
1da177e4 | 2638 | |
51456b29 | 2639 | if (!inet->mc_list) |
1da177e4 LT |
2640 | return; |
2641 | ||
2642 | rtnl_lock(); | |
1d7138de | 2643 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2644 | struct in_device *in_dev; |
1da177e4 | 2645 | |
1d7138de | 2646 | inet->mc_list = iml->next_rcu; |
877acedc | 2647 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2648 | (void) ip_mc_leave_src(sk, iml, in_dev); |
00db4124 | 2649 | if (in_dev) |
1da177e4 | 2650 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2651 | /* decrease mem now to avoid the memleak warning */ |
2652 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2653 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2654 | } |
2655 | rtnl_unlock(); | |
2656 | } | |
2657 | ||
dbdd9a52 | 2658 | /* called with rcu_read_lock() */ |
2094acbb | 2659 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
1da177e4 LT |
2660 | { |
2661 | struct ip_mc_list *im; | |
e9897071 | 2662 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2663 | struct ip_sf_list *psf; |
2664 | int rv = 0; | |
2665 | ||
e9897071 ED |
2666 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2667 | if (mc_hash) { | |
c70eba74 | 2668 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2669 | |
2670 | for (im = rcu_dereference(mc_hash[hash]); | |
2671 | im != NULL; | |
2672 | im = rcu_dereference(im->next_hash)) { | |
2673 | if (im->multiaddr == mc_addr) | |
2674 | break; | |
2675 | } | |
2676 | } else { | |
2677 | for_each_pmc_rcu(in_dev, im) { | |
2678 | if (im->multiaddr == mc_addr) | |
2679 | break; | |
2680 | } | |
1da177e4 LT |
2681 | } |
2682 | if (im && proto == IPPROTO_IGMP) { | |
2683 | rv = 1; | |
2684 | } else if (im) { | |
2685 | if (src_addr) { | |
c71151f0 | 2686 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2687 | if (psf->sf_inaddr == src_addr) |
2688 | break; | |
2689 | } | |
2690 | if (psf) | |
2691 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2692 | psf->sf_count[MCAST_EXCLUDE] != | |
2693 | im->sfcount[MCAST_EXCLUDE]; | |
2694 | else | |
2695 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2696 | } else | |
2697 | rv = 1; /* unspecified source; tentatively allow */ | |
2698 | } | |
1da177e4 LT |
2699 | return rv; |
2700 | } | |
2701 | ||
2702 | #if defined(CONFIG_PROC_FS) | |
2703 | struct igmp_mc_iter_state { | |
7091e728 | 2704 | struct seq_net_private p; |
1da177e4 LT |
2705 | struct net_device *dev; |
2706 | struct in_device *in_dev; | |
2707 | }; | |
2708 | ||
2709 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2710 | ||
2711 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2712 | { | |
7091e728 | 2713 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2714 | struct ip_mc_list *im = NULL; |
2715 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2716 | ||
7562f876 | 2717 | state->in_dev = NULL; |
61fbab77 | 2718 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2719 | struct in_device *in_dev; |
6baff150 ED |
2720 | |
2721 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2722 | if (!in_dev) |
2723 | continue; | |
1d7138de | 2724 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2725 | if (im) { |
2726 | state->in_dev = in_dev; | |
2727 | break; | |
2728 | } | |
1da177e4 LT |
2729 | } |
2730 | return im; | |
2731 | } | |
2732 | ||
2733 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2734 | { | |
2735 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2736 | |
1d7138de ED |
2737 | im = rcu_dereference(im->next_rcu); |
2738 | while (!im) { | |
6baff150 | 2739 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2740 | if (!state->dev) { |
2741 | state->in_dev = NULL; | |
2742 | break; | |
2743 | } | |
6baff150 | 2744 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2745 | if (!state->in_dev) |
2746 | continue; | |
1d7138de | 2747 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2748 | } |
2749 | return im; | |
2750 | } | |
2751 | ||
2752 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2753 | { | |
2754 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2755 | if (im) | |
2756 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2757 | --pos; | |
2758 | return pos ? NULL : im; | |
2759 | } | |
2760 | ||
2761 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2762 | __acquires(rcu) |
1da177e4 | 2763 | { |
61fbab77 | 2764 | rcu_read_lock(); |
1da177e4 LT |
2765 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2766 | } | |
2767 | ||
2768 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2769 | { | |
2770 | struct ip_mc_list *im; | |
2771 | if (v == SEQ_START_TOKEN) | |
2772 | im = igmp_mc_get_first(seq); | |
2773 | else | |
2774 | im = igmp_mc_get_next(seq, v); | |
2775 | ++*pos; | |
2776 | return im; | |
2777 | } | |
2778 | ||
2779 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2780 | __releases(rcu) |
1da177e4 LT |
2781 | { |
2782 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2783 | |
2784 | state->in_dev = NULL; | |
1da177e4 | 2785 | state->dev = NULL; |
61fbab77 | 2786 | rcu_read_unlock(); |
1da177e4 LT |
2787 | } |
2788 | ||
2789 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2790 | { | |
2791 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2792 | seq_puts(seq, |
1da177e4 LT |
2793 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2794 | else { | |
2795 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2796 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2797 | char *querier; | |
a399a805 ED |
2798 | long delta; |
2799 | ||
1da177e4 LT |
2800 | #ifdef CONFIG_IP_MULTICAST |
2801 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2802 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2803 | "V3"; | |
2804 | #else | |
2805 | querier = "NONE"; | |
2806 | #endif | |
2807 | ||
e6b68883 | 2808 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2809 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2810 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2811 | } |
2812 | ||
a399a805 | 2813 | delta = im->timer.expires - jiffies; |
1da177e4 | 2814 | seq_printf(seq, |
338fcf98 | 2815 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2816 | im->multiaddr, im->users, |
a399a805 ED |
2817 | im->tm_running, |
2818 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2819 | im->reporter); |
2820 | } | |
2821 | return 0; | |
2822 | } | |
2823 | ||
f690808e | 2824 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2825 | .start = igmp_mc_seq_start, |
2826 | .next = igmp_mc_seq_next, | |
2827 | .stop = igmp_mc_seq_stop, | |
2828 | .show = igmp_mc_seq_show, | |
2829 | }; | |
2830 | ||
2831 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2832 | { | |
7091e728 | 2833 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2834 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2835 | } |
2836 | ||
9a32144e | 2837 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2838 | .owner = THIS_MODULE, |
2839 | .open = igmp_mc_seq_open, | |
2840 | .read = seq_read, | |
2841 | .llseek = seq_lseek, | |
7091e728 | 2842 | .release = seq_release_net, |
1da177e4 LT |
2843 | }; |
2844 | ||
2845 | struct igmp_mcf_iter_state { | |
7091e728 | 2846 | struct seq_net_private p; |
1da177e4 LT |
2847 | struct net_device *dev; |
2848 | struct in_device *idev; | |
2849 | struct ip_mc_list *im; | |
2850 | }; | |
2851 | ||
2852 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2853 | ||
2854 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2855 | { | |
7091e728 | 2856 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2857 | struct ip_sf_list *psf = NULL; |
2858 | struct ip_mc_list *im = NULL; | |
2859 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2860 | ||
7562f876 PE |
2861 | state->idev = NULL; |
2862 | state->im = NULL; | |
61fbab77 | 2863 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2864 | struct in_device *idev; |
6baff150 | 2865 | idev = __in_dev_get_rcu(state->dev); |
51456b29 | 2866 | if (unlikely(!idev)) |
1da177e4 | 2867 | continue; |
1d7138de | 2868 | im = rcu_dereference(idev->mc_list); |
00db4124 | 2869 | if (likely(im)) { |
1da177e4 LT |
2870 | spin_lock_bh(&im->lock); |
2871 | psf = im->sources; | |
00db4124 | 2872 | if (likely(psf)) { |
1da177e4 LT |
2873 | state->im = im; |
2874 | state->idev = idev; | |
2875 | break; | |
2876 | } | |
2877 | spin_unlock_bh(&im->lock); | |
2878 | } | |
1da177e4 LT |
2879 | } |
2880 | return psf; | |
2881 | } | |
2882 | ||
2883 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2884 | { | |
2885 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2886 | ||
2887 | psf = psf->sf_next; | |
2888 | while (!psf) { | |
2889 | spin_unlock_bh(&state->im->lock); | |
2890 | state->im = state->im->next; | |
2891 | while (!state->im) { | |
6baff150 | 2892 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2893 | if (!state->dev) { |
2894 | state->idev = NULL; | |
2895 | goto out; | |
2896 | } | |
6baff150 | 2897 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2898 | if (!state->idev) |
2899 | continue; | |
1d7138de | 2900 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2901 | } |
2902 | if (!state->im) | |
2903 | break; | |
2904 | spin_lock_bh(&state->im->lock); | |
2905 | psf = state->im->sources; | |
2906 | } | |
2907 | out: | |
2908 | return psf; | |
2909 | } | |
2910 | ||
2911 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2912 | { | |
2913 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2914 | if (psf) | |
2915 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2916 | --pos; | |
2917 | return pos ? NULL : psf; | |
2918 | } | |
2919 | ||
2920 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2921 | __acquires(rcu) |
1da177e4 | 2922 | { |
61fbab77 | 2923 | rcu_read_lock(); |
1da177e4 LT |
2924 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2925 | } | |
2926 | ||
2927 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2928 | { | |
2929 | struct ip_sf_list *psf; | |
2930 | if (v == SEQ_START_TOKEN) | |
2931 | psf = igmp_mcf_get_first(seq); | |
2932 | else | |
2933 | psf = igmp_mcf_get_next(seq, v); | |
2934 | ++*pos; | |
2935 | return psf; | |
2936 | } | |
2937 | ||
2938 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2939 | __releases(rcu) |
1da177e4 LT |
2940 | { |
2941 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
00db4124 | 2942 | if (likely(state->im)) { |
1da177e4 LT |
2943 | spin_unlock_bh(&state->im->lock); |
2944 | state->im = NULL; | |
2945 | } | |
1d7138de | 2946 | state->idev = NULL; |
1da177e4 | 2947 | state->dev = NULL; |
61fbab77 | 2948 | rcu_read_unlock(); |
1da177e4 LT |
2949 | } |
2950 | ||
2951 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2952 | { | |
2953 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2954 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2955 | ||
2956 | if (v == SEQ_START_TOKEN) { | |
1744bea1 | 2957 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
1da177e4 LT |
2958 | } else { |
2959 | seq_printf(seq, | |
2960 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2961 | "0x%08x %6lu %6lu\n", |
2962 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2963 | ntohl(state->im->multiaddr), |
2964 | ntohl(psf->sf_inaddr), | |
2965 | psf->sf_count[MCAST_INCLUDE], | |
2966 | psf->sf_count[MCAST_EXCLUDE]); | |
2967 | } | |
2968 | return 0; | |
2969 | } | |
2970 | ||
f690808e | 2971 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2972 | .start = igmp_mcf_seq_start, |
2973 | .next = igmp_mcf_seq_next, | |
2974 | .stop = igmp_mcf_seq_stop, | |
2975 | .show = igmp_mcf_seq_show, | |
2976 | }; | |
2977 | ||
2978 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2979 | { | |
7091e728 | 2980 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2981 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2982 | } |
2983 | ||
9a32144e | 2984 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2985 | .owner = THIS_MODULE, |
2986 | .open = igmp_mcf_seq_open, | |
2987 | .read = seq_read, | |
2988 | .llseek = seq_lseek, | |
7091e728 | 2989 | .release = seq_release_net, |
1da177e4 LT |
2990 | }; |
2991 | ||
2c8c1e72 | 2992 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2993 | { |
7091e728 | 2994 | struct proc_dir_entry *pde; |
93a714d6 | 2995 | int err; |
7091e728 | 2996 | |
d4beaa66 | 2997 | pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); |
7091e728 AD |
2998 | if (!pde) |
2999 | goto out_igmp; | |
d4beaa66 G |
3000 | pde = proc_create("mcfilter", S_IRUGO, net->proc_net, |
3001 | &igmp_mcf_seq_fops); | |
7091e728 AD |
3002 | if (!pde) |
3003 | goto out_mcfilter; | |
93a714d6 MC |
3004 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
3005 | SOCK_DGRAM, 0, net); | |
3006 | if (err < 0) { | |
3007 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
3008 | err); | |
3009 | goto out_sock; | |
3010 | } | |
3011 | ||
1da177e4 | 3012 | return 0; |
7091e728 | 3013 | |
93a714d6 MC |
3014 | out_sock: |
3015 | remove_proc_entry("mcfilter", net->proc_net); | |
7091e728 | 3016 | out_mcfilter: |
ece31ffd | 3017 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
3018 | out_igmp: |
3019 | return -ENOMEM; | |
3020 | } | |
3021 | ||
2c8c1e72 | 3022 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 3023 | { |
ece31ffd G |
3024 | remove_proc_entry("mcfilter", net->proc_net); |
3025 | remove_proc_entry("igmp", net->proc_net); | |
93a714d6 | 3026 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
7091e728 AD |
3027 | } |
3028 | ||
3029 | static struct pernet_operations igmp_net_ops = { | |
3030 | .init = igmp_net_init, | |
3031 | .exit = igmp_net_exit, | |
3032 | }; | |
72c1d3bd | 3033 | #endif |
7091e728 | 3034 | |
4aa5dee4 JP |
3035 | static int igmp_netdev_event(struct notifier_block *this, |
3036 | unsigned long event, void *ptr) | |
3037 | { | |
3038 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3039 | struct in_device *in_dev; | |
3040 | ||
3041 | switch (event) { | |
3042 | case NETDEV_RESEND_IGMP: | |
3043 | in_dev = __in_dev_get_rtnl(dev); | |
3044 | if (in_dev) | |
3045 | ip_mc_rejoin_groups(in_dev); | |
3046 | break; | |
3047 | default: | |
3048 | break; | |
3049 | } | |
3050 | return NOTIFY_DONE; | |
3051 | } | |
3052 | ||
3053 | static struct notifier_block igmp_notifier = { | |
3054 | .notifier_call = igmp_netdev_event, | |
3055 | }; | |
3056 | ||
72c1d3bd | 3057 | int __init igmp_mc_init(void) |
7091e728 | 3058 | { |
72c1d3bd | 3059 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
3060 | int err; |
3061 | ||
3062 | err = register_pernet_subsys(&igmp_net_ops); | |
3063 | if (err) | |
3064 | return err; | |
3065 | err = register_netdevice_notifier(&igmp_notifier); | |
3066 | if (err) | |
3067 | goto reg_notif_fail; | |
3068 | return 0; | |
3069 | ||
3070 | reg_notif_fail: | |
3071 | unregister_pernet_subsys(&igmp_net_ops); | |
3072 | return err; | |
72c1d3bd WC |
3073 | #else |
3074 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 3075 | #endif |
72c1d3bd | 3076 | } |