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