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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
1da177e4 | 75 | #include <asm/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> |
14c85021 | 92 | |
457c4cbc | 93 | #include <net/net_namespace.h> |
14c85021 | 94 | #include <net/arp.h> |
1da177e4 LT |
95 | #include <net/ip.h> |
96 | #include <net/protocol.h> | |
97 | #include <net/route.h> | |
98 | #include <net/sock.h> | |
99 | #include <net/checksum.h> | |
93a714d6 | 100 | #include <net/inet_common.h> |
1da177e4 LT |
101 | #include <linux/netfilter_ipv4.h> |
102 | #ifdef CONFIG_IP_MROUTE | |
103 | #include <linux/mroute.h> | |
104 | #endif | |
105 | #ifdef CONFIG_PROC_FS | |
106 | #include <linux/proc_fs.h> | |
107 | #include <linux/seq_file.h> | |
108 | #endif | |
109 | ||
1da177e4 LT |
110 | #ifdef CONFIG_IP_MULTICAST |
111 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
112 | ||
436f7c20 FF |
113 | #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ) |
114 | #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ) | |
115 | #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) | |
116 | #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) | |
117 | #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) | |
118 | #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2 | |
1da177e4 LT |
119 | |
120 | ||
436f7c20 | 121 | #define IGMP_INITIAL_REPORT_DELAY (1) |
1da177e4 | 122 | |
436f7c20 | 123 | /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! |
1da177e4 LT |
124 | * IGMP specs require to report membership immediately after |
125 | * joining a group, but we delay the first report by a | |
126 | * small interval. It seems more natural and still does not | |
127 | * contradict to specs provided this delay is small enough. | |
128 | */ | |
129 | ||
42f811b8 | 130 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 131 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
132 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
133 | ((in_dev)->mr_v1_seen && \ | |
134 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
135 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 136 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
137 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
138 | ((in_dev)->mr_v2_seen && \ | |
139 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 | 140 | |
cab70040 WM |
141 | static int unsolicited_report_interval(struct in_device *in_dev) |
142 | { | |
2690048c WM |
143 | int interval_ms, interval_jiffies; |
144 | ||
cab70040 | 145 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
2690048c WM |
146 | interval_ms = IN_DEV_CONF_GET( |
147 | in_dev, | |
148 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
cab70040 | 149 | else /* v3 */ |
2690048c WM |
150 | interval_ms = IN_DEV_CONF_GET( |
151 | in_dev, | |
152 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
153 | ||
154 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
155 | ||
156 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
157 | * we always return a positive value. | |
158 | */ | |
159 | if (interval_jiffies <= 0) | |
160 | interval_jiffies = 1; | |
161 | return interval_jiffies; | |
cab70040 WM |
162 | } |
163 | ||
1da177e4 | 164 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
24803f38 | 165 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
1da177e4 LT |
166 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
167 | static int sf_setstate(struct ip_mc_list *pmc); | |
168 | static void sf_markstate(struct ip_mc_list *pmc); | |
169 | #endif | |
170 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
171 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
172 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
173 | |
174 | static void ip_ma_put(struct ip_mc_list *im) | |
175 | { | |
176 | if (atomic_dec_and_test(&im->refcnt)) { | |
177 | in_dev_put(im->interface); | |
42ea299d | 178 | kfree_rcu(im, rcu); |
1da177e4 LT |
179 | } |
180 | } | |
181 | ||
d9aa9380 DM |
182 | #define for_each_pmc_rcu(in_dev, pmc) \ |
183 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
184 | pmc != NULL; \ | |
185 | pmc = rcu_dereference(pmc->next_rcu)) | |
186 | ||
187 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
188 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
189 | pmc != NULL; \ | |
190 | pmc = rtnl_dereference(pmc->next_rcu)) | |
191 | ||
1da177e4 LT |
192 | #ifdef CONFIG_IP_MULTICAST |
193 | ||
194 | /* | |
195 | * Timer management | |
196 | */ | |
197 | ||
1d7138de | 198 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
199 | { |
200 | spin_lock_bh(&im->lock); | |
201 | if (del_timer(&im->timer)) | |
202 | atomic_dec(&im->refcnt); | |
a7e9ff73 | 203 | im->tm_running = 0; |
1da177e4 LT |
204 | im->reporter = 0; |
205 | im->unsolicit_count = 0; | |
206 | spin_unlock_bh(&im->lock); | |
207 | } | |
208 | ||
209 | /* It must be called with locked im->lock */ | |
210 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
211 | { | |
63862b5b | 212 | int tv = prandom_u32() % max_delay; |
1da177e4 | 213 | |
a7e9ff73 | 214 | im->tm_running = 1; |
1da177e4 LT |
215 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
216 | atomic_inc(&im->refcnt); | |
217 | } | |
218 | ||
219 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
220 | { | |
63862b5b | 221 | int tv = prandom_u32() % in_dev->mr_maxdelay; |
1da177e4 LT |
222 | |
223 | in_dev->mr_gq_running = 1; | |
224 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
225 | in_dev_hold(in_dev); | |
226 | } | |
227 | ||
228 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
229 | { | |
63862b5b | 230 | int tv = prandom_u32() % delay; |
1da177e4 LT |
231 | |
232 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
233 | in_dev_hold(in_dev); | |
234 | } | |
235 | ||
236 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
237 | { | |
238 | spin_lock_bh(&im->lock); | |
239 | im->unsolicit_count = 0; | |
240 | if (del_timer(&im->timer)) { | |
241 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
242 | add_timer(&im->timer); | |
a7e9ff73 | 243 | im->tm_running = 1; |
1da177e4 LT |
244 | spin_unlock_bh(&im->lock); |
245 | return; | |
246 | } | |
247 | atomic_dec(&im->refcnt); | |
248 | } | |
249 | igmp_start_timer(im, max_delay); | |
250 | spin_unlock_bh(&im->lock); | |
251 | } | |
252 | ||
253 | ||
254 | /* | |
255 | * Send an IGMP report. | |
256 | */ | |
257 | ||
258 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
259 | ||
260 | ||
261 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
262 | int gdeleted, int sdeleted) | |
263 | { | |
264 | switch (type) { | |
265 | case IGMPV3_MODE_IS_INCLUDE: | |
266 | case IGMPV3_MODE_IS_EXCLUDE: | |
267 | if (gdeleted || sdeleted) | |
268 | return 0; | |
ad12583f DS |
269 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
270 | if (pmc->sfmode == MCAST_INCLUDE) | |
271 | return 1; | |
272 | /* don't include if this source is excluded | |
273 | * in all filters | |
274 | */ | |
275 | if (psf->sf_count[MCAST_INCLUDE]) | |
276 | return type == IGMPV3_MODE_IS_INCLUDE; | |
277 | return pmc->sfcount[MCAST_EXCLUDE] == | |
278 | psf->sf_count[MCAST_EXCLUDE]; | |
279 | } | |
280 | return 0; | |
1da177e4 LT |
281 | case IGMPV3_CHANGE_TO_INCLUDE: |
282 | if (gdeleted || sdeleted) | |
283 | return 0; | |
284 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
285 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
286 | if (gdeleted || sdeleted) | |
287 | return 0; | |
288 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
289 | psf->sf_count[MCAST_INCLUDE]) | |
290 | return 0; | |
291 | return pmc->sfcount[MCAST_EXCLUDE] == | |
292 | psf->sf_count[MCAST_EXCLUDE]; | |
293 | case IGMPV3_ALLOW_NEW_SOURCES: | |
294 | if (gdeleted || !psf->sf_crcount) | |
295 | return 0; | |
296 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
297 | case IGMPV3_BLOCK_OLD_SOURCES: | |
298 | if (pmc->sfmode == MCAST_INCLUDE) | |
299 | return gdeleted || (psf->sf_crcount && sdeleted); | |
300 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
301 | } | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static int | |
306 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
307 | { | |
308 | struct ip_sf_list *psf; | |
309 | int scount = 0; | |
310 | ||
c71151f0 | 311 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
312 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
313 | continue; | |
314 | scount++; | |
315 | } | |
316 | return scount; | |
317 | } | |
318 | ||
4c672e4b | 319 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
1da177e4 LT |
320 | { |
321 | struct sk_buff *skb; | |
322 | struct rtable *rt; | |
323 | struct iphdr *pip; | |
324 | struct igmpv3_report *pig; | |
877acedc | 325 | struct net *net = dev_net(dev); |
31e4543d | 326 | struct flowi4 fl4; |
66088243 HX |
327 | int hlen = LL_RESERVED_SPACE(dev); |
328 | int tlen = dev->needed_tailroom; | |
4c672e4b | 329 | unsigned int size = mtu; |
1da177e4 | 330 | |
57e1ab6e | 331 | while (1) { |
66088243 | 332 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
333 | GFP_ATOMIC | __GFP_NOWARN); |
334 | if (skb) | |
335 | break; | |
336 | size >>= 1; | |
337 | if (size < 256) | |
338 | return NULL; | |
339 | } | |
9d4a0314 | 340 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 341 | |
31e4543d | 342 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
343 | 0, 0, |
344 | IPPROTO_IGMP, 0, dev->ifindex); | |
345 | if (IS_ERR(rt)) { | |
346 | kfree_skb(skb); | |
347 | return NULL; | |
1da177e4 | 348 | } |
1da177e4 | 349 | |
d8d1f30b | 350 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
351 | skb->dev = dev; |
352 | ||
66088243 | 353 | skb_reserve(skb, hlen); |
1837b2e2 | 354 | skb_tailroom_reserve(skb, mtu, tlen); |
1da177e4 | 355 | |
7e28ecc2 | 356 | skb_reset_network_header(skb); |
eddc9ec5 | 357 | pip = ip_hdr(skb); |
7e28ecc2 | 358 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
359 | |
360 | pip->version = 4; | |
361 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
362 | pip->tos = 0xc0; | |
363 | pip->frag_off = htons(IP_DF); | |
364 | pip->ttl = 1; | |
492f64ce DM |
365 | pip->daddr = fl4.daddr; |
366 | pip->saddr = fl4.saddr; | |
1da177e4 LT |
367 | pip->protocol = IPPROTO_IGMP; |
368 | pip->tot_len = 0; /* filled in later */ | |
b6a7719a | 369 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
370 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
371 | ((u8 *)&pip[1])[1] = 4; | |
372 | ((u8 *)&pip[1])[2] = 0; | |
373 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 374 | |
b0e380b1 | 375 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 376 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 377 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
378 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
379 | pig->resv1 = 0; | |
380 | pig->csum = 0; | |
381 | pig->resv2 = 0; | |
382 | pig->ngrec = 0; | |
383 | return skb; | |
384 | } | |
385 | ||
386 | static int igmpv3_sendpack(struct sk_buff *skb) | |
387 | { | |
d9edf9e2 | 388 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 389 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 390 | |
d9edf9e2 | 391 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 392 | |
33224b16 | 393 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
1da177e4 LT |
394 | } |
395 | ||
396 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
397 | { | |
a7e9ff73 | 398 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
399 | } |
400 | ||
401 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
402 | int type, struct igmpv3_grec **ppgr) | |
403 | { | |
404 | struct net_device *dev = pmc->interface->dev; | |
405 | struct igmpv3_report *pih; | |
406 | struct igmpv3_grec *pgr; | |
407 | ||
408 | if (!skb) | |
409 | skb = igmpv3_newpack(dev, dev->mtu); | |
410 | if (!skb) | |
411 | return NULL; | |
412 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
413 | pgr->grec_type = type; | |
414 | pgr->grec_auxwords = 0; | |
415 | pgr->grec_nsrcs = 0; | |
416 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 417 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
418 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
419 | *ppgr = pgr; | |
420 | return skb; | |
421 | } | |
422 | ||
4c672e4b | 423 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
424 | |
425 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
426 | int type, int gdeleted, int sdeleted) | |
427 | { | |
428 | struct net_device *dev = pmc->interface->dev; | |
87a8a2ae | 429 | struct net *net = dev_net(dev); |
1da177e4 LT |
430 | struct igmpv3_report *pih; |
431 | struct igmpv3_grec *pgr = NULL; | |
432 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 433 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
434 | |
435 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
436 | return skb; | |
87a8a2ae | 437 | if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 438 | return skb; |
1da177e4 LT |
439 | |
440 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
441 | type == IGMPV3_MODE_IS_EXCLUDE; | |
442 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
443 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
444 | ||
ad12583f DS |
445 | stotal = scount = 0; |
446 | ||
1da177e4 LT |
447 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
448 | ||
ad12583f DS |
449 | if (!*psf_list) |
450 | goto empty_source; | |
451 | ||
d9edf9e2 | 452 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
453 | |
454 | /* EX and TO_EX get a fresh packet, if needed */ | |
455 | if (truncate) { | |
456 | if (pih && pih->ngrec && | |
457 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
458 | if (skb) | |
459 | igmpv3_sendpack(skb); | |
460 | skb = igmpv3_newpack(dev, dev->mtu); | |
461 | } | |
462 | } | |
463 | first = 1; | |
1da177e4 | 464 | psf_prev = NULL; |
c71151f0 | 465 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 466 | __be32 *psrc; |
1da177e4 LT |
467 | |
468 | psf_next = psf->sf_next; | |
469 | ||
470 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
471 | psf_prev = psf; | |
472 | continue; | |
473 | } | |
474 | ||
a052517a HL |
475 | /* Based on RFC3376 5.1. Should not send source-list change |
476 | * records when there is a filter mode change. | |
477 | */ | |
478 | if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || | |
479 | (!gdeleted && pmc->crcount)) && | |
480 | (type == IGMPV3_ALLOW_NEW_SOURCES || | |
481 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) | |
482 | goto decrease_sf_crcount; | |
483 | ||
1da177e4 LT |
484 | /* clear marks on query responses */ |
485 | if (isquery) | |
486 | psf->sf_gsresp = 0; | |
487 | ||
63007727 | 488 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
489 | first*sizeof(struct igmpv3_grec)) { |
490 | if (truncate && !first) | |
491 | break; /* truncate these */ | |
492 | if (pgr) | |
493 | pgr->grec_nsrcs = htons(scount); | |
494 | if (skb) | |
495 | igmpv3_sendpack(skb); | |
496 | skb = igmpv3_newpack(dev, dev->mtu); | |
497 | first = 1; | |
498 | scount = 0; | |
499 | } | |
500 | if (first) { | |
501 | skb = add_grhead(skb, pmc, type, &pgr); | |
502 | first = 0; | |
503 | } | |
cc63f70b AD |
504 | if (!skb) |
505 | return NULL; | |
63007727 | 506 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 507 | *psrc = psf->sf_inaddr; |
ad12583f | 508 | scount++; stotal++; |
1da177e4 LT |
509 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
510 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
a052517a | 511 | decrease_sf_crcount: |
1da177e4 LT |
512 | psf->sf_crcount--; |
513 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
514 | if (psf_prev) | |
515 | psf_prev->sf_next = psf->sf_next; | |
516 | else | |
517 | *psf_list = psf->sf_next; | |
518 | kfree(psf); | |
519 | continue; | |
520 | } | |
521 | } | |
522 | psf_prev = psf; | |
523 | } | |
ad12583f DS |
524 | |
525 | empty_source: | |
526 | if (!stotal) { | |
527 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
528 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
529 | return skb; | |
530 | if (pmc->crcount || isquery) { | |
531 | /* make sure we have room for group header */ | |
c71151f0 | 532 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
533 | igmpv3_sendpack(skb); |
534 | skb = NULL; /* add_grhead will get a new one */ | |
535 | } | |
536 | skb = add_grhead(skb, pmc, type, &pgr); | |
537 | } | |
538 | } | |
1da177e4 LT |
539 | if (pgr) |
540 | pgr->grec_nsrcs = htons(scount); | |
541 | ||
542 | if (isquery) | |
543 | pmc->gsquery = 0; /* clear query state on report */ | |
544 | return skb; | |
545 | } | |
546 | ||
547 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
548 | { | |
549 | struct sk_buff *skb = NULL; | |
87a8a2ae | 550 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
551 | int type; |
552 | ||
553 | if (!pmc) { | |
1d7138de ED |
554 | rcu_read_lock(); |
555 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
556 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
557 | continue; | |
df2cf4a7 | 558 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
87a8a2ae | 559 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 560 | continue; |
1da177e4 LT |
561 | spin_lock_bh(&pmc->lock); |
562 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
563 | type = IGMPV3_MODE_IS_EXCLUDE; | |
564 | else | |
565 | type = IGMPV3_MODE_IS_INCLUDE; | |
566 | skb = add_grec(skb, pmc, type, 0, 0); | |
567 | spin_unlock_bh(&pmc->lock); | |
568 | } | |
1d7138de | 569 | rcu_read_unlock(); |
1da177e4 LT |
570 | } else { |
571 | spin_lock_bh(&pmc->lock); | |
572 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
573 | type = IGMPV3_MODE_IS_EXCLUDE; | |
574 | else | |
575 | type = IGMPV3_MODE_IS_INCLUDE; | |
576 | skb = add_grec(skb, pmc, type, 0, 0); | |
577 | spin_unlock_bh(&pmc->lock); | |
578 | } | |
579 | if (!skb) | |
580 | return 0; | |
581 | return igmpv3_sendpack(skb); | |
582 | } | |
583 | ||
584 | /* | |
585 | * remove zero-count source records from a source filter list | |
586 | */ | |
587 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
588 | { | |
589 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
590 | ||
591 | psf_prev = NULL; | |
c71151f0 | 592 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
593 | psf_next = psf->sf_next; |
594 | if (psf->sf_crcount == 0) { | |
595 | if (psf_prev) | |
596 | psf_prev->sf_next = psf->sf_next; | |
597 | else | |
598 | *ppsf = psf->sf_next; | |
599 | kfree(psf); | |
600 | } else | |
601 | psf_prev = psf; | |
602 | } | |
603 | } | |
604 | ||
605 | static void igmpv3_send_cr(struct in_device *in_dev) | |
606 | { | |
607 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
608 | struct sk_buff *skb = NULL; | |
609 | int type, dtype; | |
610 | ||
1d7138de | 611 | rcu_read_lock(); |
1da177e4 LT |
612 | spin_lock_bh(&in_dev->mc_tomb_lock); |
613 | ||
614 | /* deleted MCA's */ | |
615 | pmc_prev = NULL; | |
c71151f0 | 616 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
617 | pmc_next = pmc->next; |
618 | if (pmc->sfmode == MCAST_INCLUDE) { | |
619 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
620 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
621 | skb = add_grec(skb, pmc, type, 1, 0); | |
622 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
623 | } | |
624 | if (pmc->crcount) { | |
1da177e4 LT |
625 | if (pmc->sfmode == MCAST_EXCLUDE) { |
626 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
627 | skb = add_grec(skb, pmc, type, 1, 0); | |
628 | } | |
ad12583f | 629 | pmc->crcount--; |
1da177e4 LT |
630 | if (pmc->crcount == 0) { |
631 | igmpv3_clear_zeros(&pmc->tomb); | |
632 | igmpv3_clear_zeros(&pmc->sources); | |
633 | } | |
634 | } | |
635 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
636 | if (pmc_prev) | |
637 | pmc_prev->next = pmc_next; | |
638 | else | |
639 | in_dev->mc_tomb = pmc_next; | |
640 | in_dev_put(pmc->interface); | |
641 | kfree(pmc); | |
642 | } else | |
643 | pmc_prev = pmc; | |
644 | } | |
645 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
646 | ||
647 | /* change recs */ | |
1d7138de | 648 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
649 | spin_lock_bh(&pmc->lock); |
650 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
651 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
652 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
653 | } else { | |
654 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
655 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
656 | } | |
657 | skb = add_grec(skb, pmc, type, 0, 0); | |
658 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
659 | ||
660 | /* filter mode changes */ | |
661 | if (pmc->crcount) { | |
1da177e4 LT |
662 | if (pmc->sfmode == MCAST_EXCLUDE) |
663 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
664 | else | |
665 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
666 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 667 | pmc->crcount--; |
1da177e4 LT |
668 | } |
669 | spin_unlock_bh(&pmc->lock); | |
670 | } | |
1d7138de | 671 | rcu_read_unlock(); |
1da177e4 LT |
672 | |
673 | if (!skb) | |
674 | return; | |
675 | (void) igmpv3_sendpack(skb); | |
676 | } | |
677 | ||
678 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
679 | int type) | |
680 | { | |
681 | struct sk_buff *skb; | |
682 | struct iphdr *iph; | |
683 | struct igmphdr *ih; | |
684 | struct rtable *rt; | |
685 | struct net_device *dev = in_dev->dev; | |
877acedc | 686 | struct net *net = dev_net(dev); |
63007727 | 687 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 688 | struct flowi4 fl4; |
63007727 | 689 | __be32 dst; |
66088243 | 690 | int hlen, tlen; |
1da177e4 LT |
691 | |
692 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
693 | return igmpv3_send_report(in_dev, pmc); | |
df2cf4a7 | 694 | |
87a8a2ae | 695 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 PD |
696 | return 0; |
697 | ||
698 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
1da177e4 LT |
699 | dst = IGMP_ALL_ROUTER; |
700 | else | |
701 | dst = group; | |
702 | ||
31e4543d | 703 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
704 | 0, 0, |
705 | IPPROTO_IGMP, 0, dev->ifindex); | |
706 | if (IS_ERR(rt)) | |
707 | return -1; | |
708 | ||
66088243 HX |
709 | hlen = LL_RESERVED_SPACE(dev); |
710 | tlen = dev->needed_tailroom; | |
711 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
51456b29 | 712 | if (!skb) { |
1da177e4 LT |
713 | ip_rt_put(rt); |
714 | return -1; | |
715 | } | |
9d4a0314 | 716 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 717 | |
d8d1f30b | 718 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 719 | |
66088243 | 720 | skb_reserve(skb, hlen); |
1da177e4 | 721 | |
7e28ecc2 | 722 | skb_reset_network_header(skb); |
eddc9ec5 | 723 | iph = ip_hdr(skb); |
7e28ecc2 | 724 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
725 | |
726 | iph->version = 4; | |
727 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
728 | iph->tos = 0xc0; | |
729 | iph->frag_off = htons(IP_DF); | |
730 | iph->ttl = 1; | |
731 | iph->daddr = dst; | |
492f64ce | 732 | iph->saddr = fl4.saddr; |
1da177e4 | 733 | iph->protocol = IPPROTO_IGMP; |
b6a7719a | 734 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
735 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
736 | ((u8 *)&iph[1])[1] = 4; | |
737 | ((u8 *)&iph[1])[2] = 0; | |
738 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 LT |
739 | |
740 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
741 | ih->type = type; |
742 | ih->code = 0; | |
743 | ih->csum = 0; | |
744 | ih->group = group; | |
745 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 746 | |
33224b16 | 747 | return ip_local_out(net, skb->sk, skb); |
1da177e4 LT |
748 | } |
749 | ||
750 | static void igmp_gq_timer_expire(unsigned long data) | |
751 | { | |
752 | struct in_device *in_dev = (struct in_device *)data; | |
753 | ||
754 | in_dev->mr_gq_running = 0; | |
755 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 756 | in_dev_put(in_dev); |
1da177e4 LT |
757 | } |
758 | ||
759 | static void igmp_ifc_timer_expire(unsigned long data) | |
760 | { | |
761 | struct in_device *in_dev = (struct in_device *)data; | |
762 | ||
763 | igmpv3_send_cr(in_dev); | |
764 | if (in_dev->mr_ifc_count) { | |
765 | in_dev->mr_ifc_count--; | |
cab70040 WM |
766 | igmp_ifc_start_timer(in_dev, |
767 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 768 | } |
e2401654 | 769 | in_dev_put(in_dev); |
1da177e4 LT |
770 | } |
771 | ||
772 | static void igmp_ifc_event(struct in_device *in_dev) | |
773 | { | |
165094af | 774 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
775 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
776 | return; | |
165094af | 777 | in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
778 | igmp_ifc_start_timer(in_dev, 1); |
779 | } | |
780 | ||
781 | ||
782 | static void igmp_timer_expire(unsigned long data) | |
783 | { | |
c71151f0 | 784 | struct ip_mc_list *im = (struct ip_mc_list *)data; |
1da177e4 LT |
785 | struct in_device *in_dev = im->interface; |
786 | ||
787 | spin_lock(&im->lock); | |
a7e9ff73 | 788 | im->tm_running = 0; |
1da177e4 LT |
789 | |
790 | if (im->unsolicit_count) { | |
791 | im->unsolicit_count--; | |
cab70040 | 792 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
1da177e4 LT |
793 | } |
794 | im->reporter = 1; | |
795 | spin_unlock(&im->lock); | |
796 | ||
797 | if (IGMP_V1_SEEN(in_dev)) | |
798 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
799 | else if (IGMP_V2_SEEN(in_dev)) | |
800 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
801 | else | |
802 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
803 | ||
804 | ip_ma_put(im); | |
805 | } | |
806 | ||
ad12583f | 807 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 808 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
809 | { |
810 | struct ip_sf_list *psf; | |
811 | int i, scount; | |
812 | ||
ad12583f | 813 | scount = 0; |
c71151f0 | 814 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
815 | if (scount == nsrcs) |
816 | break; | |
c71151f0 | 817 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 818 | /* skip inactive filters */ |
e05c4ad3 | 819 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
820 | pmc->sfcount[MCAST_EXCLUDE] != |
821 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 822 | break; |
ad12583f DS |
823 | if (srcs[i] == psf->sf_inaddr) { |
824 | scount++; | |
825 | break; | |
826 | } | |
827 | } | |
828 | } | |
829 | pmc->gsquery = 0; | |
830 | if (scount == nsrcs) /* all sources excluded */ | |
831 | return 0; | |
832 | return 1; | |
833 | } | |
834 | ||
ea4d9e72 | 835 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
836 | { |
837 | struct ip_sf_list *psf; | |
838 | int i, scount; | |
839 | ||
840 | if (pmc->sfmode == MCAST_EXCLUDE) | |
841 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
842 | ||
843 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 844 | scount = 0; |
c71151f0 | 845 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
846 | if (scount == nsrcs) |
847 | break; | |
c71151f0 | 848 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
849 | if (srcs[i] == psf->sf_inaddr) { |
850 | psf->sf_gsresp = 1; | |
851 | scount++; | |
852 | break; | |
853 | } | |
854 | } | |
ad12583f DS |
855 | if (!scount) { |
856 | pmc->gsquery = 0; | |
857 | return 0; | |
858 | } | |
859 | pmc->gsquery = 1; | |
860 | return 1; | |
1da177e4 LT |
861 | } |
862 | ||
d679c532 ED |
863 | /* return true if packet was dropped */ |
864 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
865 | { |
866 | struct ip_mc_list *im; | |
87a8a2ae | 867 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
868 | |
869 | /* Timers are only set for non-local groups */ | |
870 | ||
871 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 872 | return false; |
87a8a2ae | 873 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 874 | return false; |
1da177e4 | 875 | |
1d7138de ED |
876 | rcu_read_lock(); |
877 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
878 | if (im->multiaddr == group) { |
879 | igmp_stop_timer(im); | |
880 | break; | |
881 | } | |
882 | } | |
1d7138de | 883 | rcu_read_unlock(); |
d679c532 | 884 | return false; |
1da177e4 LT |
885 | } |
886 | ||
d679c532 ED |
887 | /* return true if packet was dropped */ |
888 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
889 | int len) |
890 | { | |
d9edf9e2 ACM |
891 | struct igmphdr *ih = igmp_hdr(skb); |
892 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 893 | struct ip_mc_list *im; |
63007727 | 894 | __be32 group = ih->group; |
1da177e4 LT |
895 | int max_delay; |
896 | int mark = 0; | |
87a8a2ae | 897 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
898 | |
899 | ||
5b7c8406 | 900 | if (len == 8) { |
1da177e4 LT |
901 | if (ih->code == 0) { |
902 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 903 | |
436f7c20 | 904 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
1da177e4 | 905 | in_dev->mr_v1_seen = jiffies + |
436f7c20 | 906 | IGMP_V1_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
907 | group = 0; |
908 | } else { | |
909 | /* v2 router present */ | |
910 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
911 | in_dev->mr_v2_seen = jiffies + | |
436f7c20 | 912 | IGMP_V2_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
913 | } |
914 | /* cancel the interface change timer */ | |
915 | in_dev->mr_ifc_count = 0; | |
916 | if (del_timer(&in_dev->mr_ifc_timer)) | |
917 | __in_dev_put(in_dev); | |
918 | /* clear deleted report items */ | |
919 | igmpv3_clear_delrec(in_dev); | |
920 | } else if (len < 12) { | |
d679c532 | 921 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
922 | } else if (IGMP_V1_SEEN(in_dev)) { |
923 | /* This is a v3 query with v1 queriers present */ | |
436f7c20 | 924 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
5b7c8406 DS |
925 | group = 0; |
926 | } else if (IGMP_V2_SEEN(in_dev)) { | |
927 | /* this is a v3 query with v2 queriers present; | |
928 | * Interpretation of the max_delay code is problematic here. | |
929 | * A real v2 host would use ih_code directly, while v3 has a | |
930 | * different encoding. We use the v3 encoding as more likely | |
931 | * to be intended in a v3 query. | |
932 | */ | |
933 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
934 | if (!max_delay) |
935 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
936 | } else { /* v3 */ |
937 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 938 | return true; |
e905a9ed | 939 | |
d9edf9e2 | 940 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 941 | if (ih3->nsrcs) { |
e905a9ed | 942 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 943 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 944 | return true; |
d9edf9e2 | 945 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
946 | } |
947 | ||
948 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
949 | if (!max_delay) | |
950 | max_delay = 1; /* can't mod w/ 0 */ | |
951 | in_dev->mr_maxdelay = max_delay; | |
952 | if (ih3->qrv) | |
953 | in_dev->mr_qrv = ih3->qrv; | |
954 | if (!group) { /* general query */ | |
955 | if (ih3->nsrcs) | |
b47bd8d2 | 956 | return true; /* no sources allowed */ |
1da177e4 | 957 | igmp_gq_start_timer(in_dev); |
d679c532 | 958 | return false; |
1da177e4 LT |
959 | } |
960 | /* mark sources to include, if group & source-specific */ | |
961 | mark = ih3->nsrcs != 0; | |
962 | } | |
963 | ||
964 | /* | |
965 | * - Start the timers in all of our membership records | |
966 | * that the query applies to for the interface on | |
967 | * which the query arrived excl. those that belong | |
968 | * to a "local" group (224.0.0.X) | |
969 | * - For timers already running check if they need to | |
970 | * be reset. | |
971 | * - Use the igmp->igmp_code field as the maximum | |
972 | * delay possible | |
973 | */ | |
1d7138de ED |
974 | rcu_read_lock(); |
975 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
976 | int changed; |
977 | ||
1da177e4 LT |
978 | if (group && group != im->multiaddr) |
979 | continue; | |
980 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
981 | continue; | |
df2cf4a7 | 982 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 983 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 984 | continue; |
1da177e4 LT |
985 | spin_lock_bh(&im->lock); |
986 | if (im->tm_running) | |
987 | im->gsquery = im->gsquery && mark; | |
988 | else | |
989 | im->gsquery = mark; | |
ad12583f | 990 | changed = !im->gsquery || |
e905a9ed | 991 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 992 | spin_unlock_bh(&im->lock); |
ad12583f DS |
993 | if (changed) |
994 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 995 | } |
1d7138de | 996 | rcu_read_unlock(); |
d679c532 | 997 | return false; |
1da177e4 LT |
998 | } |
999 | ||
9a57a9d2 | 1000 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
1001 | int igmp_rcv(struct sk_buff *skb) |
1002 | { | |
1003 | /* This basically follows the spec line by line -- see RFC1112 */ | |
1004 | struct igmphdr *ih; | |
9a57a9d2 | 1005 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 | 1006 | int len = skb->len; |
d679c532 | 1007 | bool dropped = true; |
1da177e4 | 1008 | |
51456b29 | 1009 | if (!in_dev) |
cd557bc1 | 1010 | goto drop; |
1da177e4 | 1011 | |
fb286bb2 | 1012 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 1013 | goto drop; |
fb286bb2 | 1014 | |
de08dc1a TH |
1015 | if (skb_checksum_simple_validate(skb)) |
1016 | goto drop; | |
1da177e4 | 1017 | |
d9edf9e2 | 1018 | ih = igmp_hdr(skb); |
1da177e4 LT |
1019 | switch (ih->type) { |
1020 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 1021 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
1022 | break; |
1023 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1024 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 1025 | /* Is it our report looped back? */ |
c7537967 | 1026 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1027 | break; |
24c69275 DS |
1028 | /* don't rely on MC router hearing unicast reports */ |
1029 | if (skb->pkt_type == PACKET_MULTICAST || | |
1030 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1031 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1032 | break; |
1033 | case IGMP_PIM: | |
1034 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1035 | return pim_rcv_v1(skb); |
1036 | #endif | |
c6b471e6 | 1037 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1038 | case IGMP_DVMRP: |
1039 | case IGMP_TRACE: | |
1040 | case IGMP_HOST_LEAVE_MESSAGE: | |
1041 | case IGMP_MTRACE: | |
1042 | case IGMP_MTRACE_RESP: | |
1043 | break; | |
1044 | default: | |
dd1c1853 | 1045 | break; |
1da177e4 | 1046 | } |
fb286bb2 | 1047 | |
cd557bc1 | 1048 | drop: |
d679c532 ED |
1049 | if (dropped) |
1050 | kfree_skb(skb); | |
1051 | else | |
1052 | consume_skb(skb); | |
1da177e4 LT |
1053 | return 0; |
1054 | } | |
1055 | ||
1056 | #endif | |
1057 | ||
1058 | ||
1059 | /* | |
1060 | * Add a filter to a device | |
1061 | */ | |
1062 | ||
63007727 | 1063 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1064 | { |
1065 | char buf[MAX_ADDR_LEN]; | |
1066 | struct net_device *dev = in_dev->dev; | |
1067 | ||
1068 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1069 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1070 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1071 | routine. Something sort of: |
1072 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1073 | --ANK | |
1074 | */ | |
1075 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1076 | dev_mc_add(dev, buf); |
1da177e4 LT |
1077 | } |
1078 | ||
1079 | /* | |
1080 | * Remove a filter from a device | |
1081 | */ | |
1082 | ||
63007727 | 1083 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1084 | { |
1085 | char buf[MAX_ADDR_LEN]; | |
1086 | struct net_device *dev = in_dev->dev; | |
1087 | ||
1088 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1089 | dev_mc_del(dev, buf); |
1da177e4 LT |
1090 | } |
1091 | ||
1092 | #ifdef CONFIG_IP_MULTICAST | |
1093 | /* | |
1094 | * deleted ip_mc_list manipulation | |
1095 | */ | |
1096 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1097 | { | |
1098 | struct ip_mc_list *pmc; | |
165094af | 1099 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1100 | |
1101 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1102 | * are actually used. In particular, the refcnt and users are not | |
1103 | * used for management of the delete list. Using the same structure | |
1104 | * for deleted items allows change reports to use common code with | |
1105 | * non-deleted or query-response MCA's. | |
1106 | */ | |
0da974f4 | 1107 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1108 | if (!pmc) |
1109 | return; | |
1da177e4 LT |
1110 | spin_lock_bh(&im->lock); |
1111 | pmc->interface = im->interface; | |
1112 | in_dev_hold(in_dev); | |
1113 | pmc->multiaddr = im->multiaddr; | |
165094af | 1114 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1115 | pmc->sfmode = im->sfmode; |
1116 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1117 | struct ip_sf_list *psf; | |
1118 | ||
1119 | pmc->tomb = im->tomb; | |
1120 | pmc->sources = im->sources; | |
1121 | im->tomb = im->sources = NULL; | |
c71151f0 | 1122 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1123 | psf->sf_crcount = pmc->crcount; |
1124 | } | |
1125 | spin_unlock_bh(&im->lock); | |
1126 | ||
1127 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1128 | pmc->next = in_dev->mc_tomb; | |
1129 | in_dev->mc_tomb = pmc; | |
1130 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1131 | } | |
1132 | ||
24803f38 HL |
1133 | /* |
1134 | * restore ip_mc_list deleted records | |
1135 | */ | |
1136 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1da177e4 LT |
1137 | { |
1138 | struct ip_mc_list *pmc, *pmc_prev; | |
24803f38 HL |
1139 | struct ip_sf_list *psf; |
1140 | struct net *net = dev_net(in_dev->dev); | |
1141 | __be32 multiaddr = im->multiaddr; | |
1da177e4 LT |
1142 | |
1143 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1144 | pmc_prev = NULL; | |
c71151f0 | 1145 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1146 | if (pmc->multiaddr == multiaddr) |
1147 | break; | |
1148 | pmc_prev = pmc; | |
1149 | } | |
1150 | if (pmc) { | |
1151 | if (pmc_prev) | |
1152 | pmc_prev->next = pmc->next; | |
1153 | else | |
1154 | in_dev->mc_tomb = pmc->next; | |
1155 | } | |
1156 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
24803f38 HL |
1157 | |
1158 | spin_lock_bh(&im->lock); | |
1da177e4 | 1159 | if (pmc) { |
24803f38 HL |
1160 | im->interface = pmc->interface; |
1161 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1162 | im->sfmode = pmc->sfmode; | |
1163 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1164 | im->tomb = pmc->tomb; | |
1165 | im->sources = pmc->sources; | |
1166 | for (psf = im->sources; psf; psf = psf->sf_next) | |
1167 | psf->sf_crcount = im->crcount; | |
1da177e4 LT |
1168 | } |
1169 | in_dev_put(pmc->interface); | |
1da177e4 | 1170 | } |
24803f38 | 1171 | spin_unlock_bh(&im->lock); |
1da177e4 LT |
1172 | } |
1173 | ||
24803f38 HL |
1174 | /* |
1175 | * flush ip_mc_list deleted records | |
1176 | */ | |
1da177e4 LT |
1177 | static void igmpv3_clear_delrec(struct in_device *in_dev) |
1178 | { | |
1179 | struct ip_mc_list *pmc, *nextpmc; | |
1180 | ||
1181 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1182 | pmc = in_dev->mc_tomb; | |
1183 | in_dev->mc_tomb = NULL; | |
1184 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1185 | ||
1186 | for (; pmc; pmc = nextpmc) { | |
1187 | nextpmc = pmc->next; | |
1188 | ip_mc_clear_src(pmc); | |
1189 | in_dev_put(pmc->interface); | |
1190 | kfree(pmc); | |
1191 | } | |
1192 | /* clear dead sources, too */ | |
1d7138de ED |
1193 | rcu_read_lock(); |
1194 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1195 | struct ip_sf_list *psf, *psf_next; |
1196 | ||
1197 | spin_lock_bh(&pmc->lock); | |
1198 | psf = pmc->tomb; | |
1199 | pmc->tomb = NULL; | |
1200 | spin_unlock_bh(&pmc->lock); | |
c71151f0 | 1201 | for (; psf; psf = psf_next) { |
1da177e4 LT |
1202 | psf_next = psf->sf_next; |
1203 | kfree(psf); | |
1204 | } | |
1205 | } | |
1d7138de | 1206 | rcu_read_unlock(); |
1da177e4 LT |
1207 | } |
1208 | #endif | |
1209 | ||
1210 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1211 | { | |
1212 | struct in_device *in_dev = im->interface; | |
1213 | #ifdef CONFIG_IP_MULTICAST | |
87a8a2ae | 1214 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1215 | int reporter; |
1216 | #endif | |
1217 | ||
1218 | if (im->loaded) { | |
1219 | im->loaded = 0; | |
1220 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1221 | } | |
1222 | ||
1223 | #ifdef CONFIG_IP_MULTICAST | |
1224 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1225 | return; | |
87a8a2ae | 1226 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1227 | return; |
1da177e4 LT |
1228 | |
1229 | reporter = im->reporter; | |
1230 | igmp_stop_timer(im); | |
1231 | ||
1232 | if (!in_dev->dead) { | |
1233 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1234 | return; |
1da177e4 LT |
1235 | if (IGMP_V2_SEEN(in_dev)) { |
1236 | if (reporter) | |
1237 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1238 | return; |
1da177e4 LT |
1239 | } |
1240 | /* IGMPv3 */ | |
1241 | igmpv3_add_delrec(in_dev, im); | |
1242 | ||
1243 | igmp_ifc_event(in_dev); | |
1244 | } | |
1da177e4 | 1245 | #endif |
1da177e4 LT |
1246 | } |
1247 | ||
1248 | static void igmp_group_added(struct ip_mc_list *im) | |
1249 | { | |
1250 | struct in_device *in_dev = im->interface; | |
dcd87999 | 1251 | #ifdef CONFIG_IP_MULTICAST |
87a8a2ae | 1252 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1253 | #endif |
1da177e4 LT |
1254 | |
1255 | if (im->loaded == 0) { | |
1256 | im->loaded = 1; | |
1257 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1258 | } | |
1259 | ||
1260 | #ifdef CONFIG_IP_MULTICAST | |
1261 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1262 | return; | |
87a8a2ae | 1263 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1264 | return; |
1da177e4 LT |
1265 | |
1266 | if (in_dev->dead) | |
1267 | return; | |
1268 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1269 | spin_lock_bh(&im->lock); | |
436f7c20 | 1270 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); |
1da177e4 LT |
1271 | spin_unlock_bh(&im->lock); |
1272 | return; | |
1273 | } | |
1274 | /* else, v3 */ | |
1275 | ||
165094af | 1276 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1277 | igmp_ifc_event(in_dev); |
1278 | #endif | |
1279 | } | |
1280 | ||
1281 | ||
1282 | /* | |
1283 | * Multicast list managers | |
1284 | */ | |
1285 | ||
e9897071 ED |
1286 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1287 | { | |
c70eba74 | 1288 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1289 | } |
1290 | ||
1291 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1292 | struct ip_mc_list *im) | |
1293 | { | |
1294 | struct ip_mc_list __rcu **mc_hash; | |
1295 | u32 hash; | |
1296 | ||
1297 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1298 | if (mc_hash) { | |
1299 | hash = ip_mc_hash(im); | |
c70eba74 | 1300 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1301 | rcu_assign_pointer(mc_hash[hash], im); |
1302 | return; | |
1303 | } | |
1304 | ||
1305 | /* do not use a hash table for small number of items */ | |
1306 | if (in_dev->mc_count < 4) | |
1307 | return; | |
1308 | ||
1309 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1310 | GFP_KERNEL); | |
1311 | if (!mc_hash) | |
1312 | return; | |
1313 | ||
1314 | for_each_pmc_rtnl(in_dev, im) { | |
1315 | hash = ip_mc_hash(im); | |
c70eba74 | 1316 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1317 | RCU_INIT_POINTER(mc_hash[hash], im); |
1318 | } | |
1319 | ||
1320 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1321 | } | |
1322 | ||
1323 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1324 | struct ip_mc_list *im) | |
1325 | { | |
1326 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1327 | struct ip_mc_list *aux; | |
1328 | ||
1329 | if (!mc_hash) | |
1330 | return; | |
1331 | mc_hash += ip_mc_hash(im); | |
1332 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1333 | mc_hash = &aux->next_hash; | |
1334 | *mc_hash = im->next_hash; | |
1335 | } | |
1336 | ||
1da177e4 LT |
1337 | |
1338 | /* | |
1339 | * A socket has joined a multicast group on device dev. | |
1340 | */ | |
1341 | ||
8f935bbd | 1342 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1343 | { |
1344 | struct ip_mc_list *im; | |
dcd87999 | 1345 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1346 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1347 | #endif |
1da177e4 LT |
1348 | |
1349 | ASSERT_RTNL(); | |
1350 | ||
1d7138de | 1351 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1352 | if (im->multiaddr == addr) { |
1353 | im->users++; | |
1354 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1355 | goto out; | |
1356 | } | |
1357 | } | |
1358 | ||
1d7138de | 1359 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1360 | if (!im) |
1361 | goto out; | |
1362 | ||
a7e9ff73 JK |
1363 | im->users = 1; |
1364 | im->interface = in_dev; | |
1da177e4 | 1365 | in_dev_hold(in_dev); |
a7e9ff73 | 1366 | im->multiaddr = addr; |
1da177e4 LT |
1367 | /* initial mode is (EX, empty) */ |
1368 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1369 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1370 | atomic_set(&im->refcnt, 1); |
1371 | spin_lock_init(&im->lock); | |
1372 | #ifdef CONFIG_IP_MULTICAST | |
179542a5 | 1373 | setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im); |
165094af | 1374 | im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1375 | #endif |
1d7138de ED |
1376 | |
1377 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1378 | in_dev->mc_count++; |
cf778b00 | 1379 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1380 | |
e9897071 ED |
1381 | ip_mc_hash_add(in_dev, im); |
1382 | ||
1da177e4 | 1383 | #ifdef CONFIG_IP_MULTICAST |
24803f38 | 1384 | igmpv3_del_delrec(in_dev, im); |
1da177e4 LT |
1385 | #endif |
1386 | igmp_group_added(im); | |
1387 | if (!in_dev->dead) | |
1388 | ip_rt_multicast_event(in_dev); | |
1389 | out: | |
1390 | return; | |
1391 | } | |
4bc2f18b | 1392 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1393 | |
9afd85c9 LL |
1394 | static int ip_mc_check_iphdr(struct sk_buff *skb) |
1395 | { | |
1396 | const struct iphdr *iph; | |
1397 | unsigned int len; | |
1398 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1399 | ||
1400 | if (!pskb_may_pull(skb, offset)) | |
1401 | return -EINVAL; | |
1402 | ||
1403 | iph = ip_hdr(skb); | |
1404 | ||
1405 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1406 | return -EINVAL; | |
1407 | ||
1408 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1409 | ||
1410 | if (!pskb_may_pull(skb, offset)) | |
1411 | return -EINVAL; | |
1412 | ||
1413 | iph = ip_hdr(skb); | |
1414 | ||
1415 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1416 | return -EINVAL; | |
1417 | ||
1418 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1419 | if (skb->len < len || len < offset) | |
1420 | return -EINVAL; | |
1421 | ||
1422 | skb_set_transport_header(skb, offset); | |
1423 | ||
1424 | return 0; | |
1425 | } | |
1426 | ||
1427 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1428 | { | |
1429 | unsigned int len = skb_transport_offset(skb); | |
1430 | ||
1431 | len += sizeof(struct igmpv3_report); | |
1432 | ||
1433 | return pskb_may_pull(skb, len) ? 0 : -EINVAL; | |
1434 | } | |
1435 | ||
1436 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1437 | { | |
1438 | unsigned int len = skb_transport_offset(skb); | |
1439 | ||
1440 | len += sizeof(struct igmphdr); | |
1441 | if (skb->len < len) | |
1442 | return -EINVAL; | |
1443 | ||
1444 | /* IGMPv{1,2}? */ | |
1445 | if (skb->len != len) { | |
1446 | /* or IGMPv3? */ | |
1447 | len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); | |
1448 | if (skb->len < len || !pskb_may_pull(skb, len)) | |
1449 | return -EINVAL; | |
1450 | } | |
1451 | ||
1452 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1453 | * all-systems destination addresses (224.0.0.1) for general queries | |
1454 | */ | |
1455 | if (!igmp_hdr(skb)->group && | |
1456 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1457 | return -EINVAL; | |
1458 | ||
1459 | return 0; | |
1460 | } | |
1461 | ||
1462 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1463 | { | |
1464 | switch (igmp_hdr(skb)->type) { | |
1465 | case IGMP_HOST_LEAVE_MESSAGE: | |
1466 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1467 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1468 | /* fall through */ | |
1469 | return 0; | |
1470 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1471 | return ip_mc_check_igmp_reportv3(skb); | |
1472 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1473 | return ip_mc_check_igmp_query(skb); | |
1474 | default: | |
1475 | return -ENOMSG; | |
1476 | } | |
1477 | } | |
1478 | ||
1479 | static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) | |
1480 | { | |
1481 | return skb_checksum_simple_validate(skb); | |
1482 | } | |
1483 | ||
1484 | static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1485 | ||
1486 | { | |
1487 | struct sk_buff *skb_chk; | |
1488 | unsigned int transport_len; | |
1489 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); | |
a516993f | 1490 | int ret = -EINVAL; |
9afd85c9 LL |
1491 | |
1492 | transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); | |
1493 | ||
9afd85c9 LL |
1494 | skb_chk = skb_checksum_trimmed(skb, transport_len, |
1495 | ip_mc_validate_checksum); | |
1496 | if (!skb_chk) | |
a516993f | 1497 | goto err; |
9afd85c9 | 1498 | |
a516993f LL |
1499 | if (!pskb_may_pull(skb_chk, len)) |
1500 | goto err; | |
9afd85c9 LL |
1501 | |
1502 | ret = ip_mc_check_igmp_msg(skb_chk); | |
a516993f LL |
1503 | if (ret) |
1504 | goto err; | |
9afd85c9 LL |
1505 | |
1506 | if (skb_trimmed) | |
1507 | *skb_trimmed = skb_chk; | |
a516993f LL |
1508 | /* free now unneeded clone */ |
1509 | else if (skb_chk != skb) | |
9afd85c9 LL |
1510 | kfree_skb(skb_chk); |
1511 | ||
a516993f LL |
1512 | ret = 0; |
1513 | ||
1514 | err: | |
1515 | if (ret && skb_chk && skb_chk != skb) | |
1516 | kfree_skb(skb_chk); | |
1517 | ||
1518 | return ret; | |
9afd85c9 LL |
1519 | } |
1520 | ||
1521 | /** | |
1522 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1523 | * @skb: the skb to validate | |
1524 | * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) | |
1525 | * | |
1526 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
a516993f | 1527 | * skb transport header accordingly and returns zero. |
9afd85c9 LL |
1528 | * |
1529 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1530 | * standard | |
1531 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1532 | * -ENOMEM: A memory allocation failure happened. | |
1533 | * | |
1534 | * Optionally, an skb pointer might be provided via skb_trimmed (or set it | |
1535 | * to NULL): After parsing an IGMP packet successfully it will point to | |
1536 | * an skb which has its tail aligned to the IP packet end. This might | |
1537 | * either be the originally provided skb or a trimmed, cloned version if | |
1538 | * the skb frame had data beyond the IP packet. A cloned skb allows us | |
1539 | * to leave the original skb and its full frame unchanged (which might be | |
1540 | * desirable for layer 2 frame jugglers). | |
1541 | * | |
a516993f LL |
1542 | * Caller needs to set the skb network header and free any returned skb if it |
1543 | * differs from the provided skb. | |
9afd85c9 LL |
1544 | */ |
1545 | int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1546 | { | |
1547 | int ret = ip_mc_check_iphdr(skb); | |
1548 | ||
1549 | if (ret < 0) | |
1550 | return ret; | |
1551 | ||
1552 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1553 | return -ENOMSG; | |
1554 | ||
1555 | return __ip_mc_check_igmp(skb, skb_trimmed); | |
1556 | } | |
1557 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1558 | ||
a816c7c7 | 1559 | /* |
4aa5dee4 | 1560 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1561 | */ |
4aa5dee4 | 1562 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1563 | { |
08882669 | 1564 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1565 | struct ip_mc_list *im; |
1566 | int type; | |
87a8a2ae | 1567 | struct net *net = dev_net(in_dev->dev); |
a816c7c7 | 1568 | |
4aa5dee4 JP |
1569 | ASSERT_RTNL(); |
1570 | ||
1571 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1572 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1573 | continue; | |
df2cf4a7 | 1574 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1575 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1576 | continue; |
a816c7c7 | 1577 | |
866f3b25 ED |
1578 | /* a failover is happening and switches |
1579 | * must be notified immediately | |
1580 | */ | |
1581 | if (IGMP_V1_SEEN(in_dev)) | |
1582 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1583 | else if (IGMP_V2_SEEN(in_dev)) | |
1584 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1585 | else | |
1586 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1587 | igmp_send_report(in_dev, im, type); | |
1588 | } | |
a816c7c7 JV |
1589 | #endif |
1590 | } | |
1591 | ||
1da177e4 LT |
1592 | /* |
1593 | * A socket has left a multicast group on device dev | |
1594 | */ | |
1595 | ||
8f935bbd | 1596 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1597 | { |
1d7138de ED |
1598 | struct ip_mc_list *i; |
1599 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1600 | |
1da177e4 | 1601 | ASSERT_RTNL(); |
e905a9ed | 1602 | |
1d7138de ED |
1603 | for (ip = &in_dev->mc_list; |
1604 | (i = rtnl_dereference(*ip)) != NULL; | |
1605 | ip = &i->next_rcu) { | |
a7e9ff73 | 1606 | if (i->multiaddr == addr) { |
1da177e4 | 1607 | if (--i->users == 0) { |
e9897071 | 1608 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1609 | *ip = i->next_rcu; |
b8bae41e | 1610 | in_dev->mc_count--; |
1da177e4 | 1611 | igmp_group_dropped(i); |
24cf3af3 | 1612 | ip_mc_clear_src(i); |
1da177e4 LT |
1613 | |
1614 | if (!in_dev->dead) | |
1615 | ip_rt_multicast_event(in_dev); | |
1616 | ||
1617 | ip_ma_put(i); | |
1618 | return; | |
1619 | } | |
1620 | break; | |
1621 | } | |
1622 | } | |
1623 | } | |
4bc2f18b | 1624 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1625 | |
75c78500 MS |
1626 | /* Device changing type */ |
1627 | ||
1628 | void ip_mc_unmap(struct in_device *in_dev) | |
1629 | { | |
1d7138de | 1630 | struct ip_mc_list *pmc; |
75c78500 MS |
1631 | |
1632 | ASSERT_RTNL(); | |
1633 | ||
1d7138de ED |
1634 | for_each_pmc_rtnl(in_dev, pmc) |
1635 | igmp_group_dropped(pmc); | |
75c78500 MS |
1636 | } |
1637 | ||
1638 | void ip_mc_remap(struct in_device *in_dev) | |
1639 | { | |
1d7138de | 1640 | struct ip_mc_list *pmc; |
75c78500 MS |
1641 | |
1642 | ASSERT_RTNL(); | |
1643 | ||
24803f38 HL |
1644 | for_each_pmc_rtnl(in_dev, pmc) { |
1645 | #ifdef CONFIG_IP_MULTICAST | |
1646 | igmpv3_del_delrec(in_dev, pmc); | |
1647 | #endif | |
1d7138de | 1648 | igmp_group_added(pmc); |
24803f38 | 1649 | } |
75c78500 MS |
1650 | } |
1651 | ||
1da177e4 LT |
1652 | /* Device going down */ |
1653 | ||
1654 | void ip_mc_down(struct in_device *in_dev) | |
1655 | { | |
1d7138de | 1656 | struct ip_mc_list *pmc; |
1da177e4 LT |
1657 | |
1658 | ASSERT_RTNL(); | |
1659 | ||
1d7138de ED |
1660 | for_each_pmc_rtnl(in_dev, pmc) |
1661 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1662 | |
1663 | #ifdef CONFIG_IP_MULTICAST | |
1664 | in_dev->mr_ifc_count = 0; | |
1665 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1666 | __in_dev_put(in_dev); | |
1667 | in_dev->mr_gq_running = 0; | |
1668 | if (del_timer(&in_dev->mr_gq_timer)) | |
1669 | __in_dev_put(in_dev); | |
1da177e4 LT |
1670 | #endif |
1671 | ||
1672 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1673 | } | |
1674 | ||
1675 | void ip_mc_init_dev(struct in_device *in_dev) | |
1676 | { | |
dcd87999 | 1677 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1678 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1679 | #endif |
1da177e4 LT |
1680 | ASSERT_RTNL(); |
1681 | ||
1da177e4 | 1682 | #ifdef CONFIG_IP_MULTICAST |
b24b8a24 PE |
1683 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1684 | (unsigned long)in_dev); | |
b24b8a24 PE |
1685 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1686 | (unsigned long)in_dev); | |
165094af | 1687 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1688 | #endif |
1689 | ||
1da177e4 LT |
1690 | spin_lock_init(&in_dev->mc_tomb_lock); |
1691 | } | |
1692 | ||
1693 | /* Device going up */ | |
1694 | ||
1695 | void ip_mc_up(struct in_device *in_dev) | |
1696 | { | |
1d7138de | 1697 | struct ip_mc_list *pmc; |
dcd87999 | 1698 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1699 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1700 | #endif |
1da177e4 LT |
1701 | |
1702 | ASSERT_RTNL(); | |
1703 | ||
a9fe8e29 | 1704 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1705 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; |
a9fe8e29 | 1706 | #endif |
1da177e4 LT |
1707 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1708 | ||
24803f38 HL |
1709 | for_each_pmc_rtnl(in_dev, pmc) { |
1710 | #ifdef CONFIG_IP_MULTICAST | |
1711 | igmpv3_del_delrec(in_dev, pmc); | |
1712 | #endif | |
1d7138de | 1713 | igmp_group_added(pmc); |
24803f38 | 1714 | } |
1da177e4 LT |
1715 | } |
1716 | ||
1717 | /* | |
1718 | * Device is about to be destroyed: clean up. | |
1719 | */ | |
1720 | ||
1721 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1722 | { | |
1723 | struct ip_mc_list *i; | |
1724 | ||
1725 | ASSERT_RTNL(); | |
1726 | ||
1727 | /* Deactivate timers */ | |
1728 | ip_mc_down(in_dev); | |
24803f38 HL |
1729 | #ifdef CONFIG_IP_MULTICAST |
1730 | igmpv3_clear_delrec(in_dev); | |
1731 | #endif | |
1da177e4 | 1732 | |
1d7138de ED |
1733 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1734 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1735 | in_dev->mc_count--; |
1da177e4 | 1736 | ip_ma_put(i); |
1da177e4 | 1737 | } |
1da177e4 LT |
1738 | } |
1739 | ||
9e917dca | 1740 | /* RTNL is locked */ |
877acedc | 1741 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1742 | { |
1da177e4 LT |
1743 | struct net_device *dev = NULL; |
1744 | struct in_device *idev = NULL; | |
1745 | ||
1746 | if (imr->imr_ifindex) { | |
877acedc | 1747 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1748 | return idev; |
1749 | } | |
1750 | if (imr->imr_address.s_addr) { | |
9e917dca | 1751 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1752 | if (!dev) |
1753 | return NULL; | |
1da177e4 LT |
1754 | } |
1755 | ||
b23dd4fe | 1756 | if (!dev) { |
78fbfd8a DM |
1757 | struct rtable *rt = ip_route_output(net, |
1758 | imr->imr_multiaddr.s_addr, | |
1759 | 0, 0, 0); | |
b23dd4fe DM |
1760 | if (!IS_ERR(rt)) { |
1761 | dev = rt->dst.dev; | |
1762 | ip_rt_put(rt); | |
1763 | } | |
1da177e4 LT |
1764 | } |
1765 | if (dev) { | |
1766 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1767 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1768 | } |
1769 | return idev; | |
1770 | } | |
1771 | ||
1772 | /* | |
1773 | * Join a socket to a group | |
1774 | */ | |
1da177e4 LT |
1775 | |
1776 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1777 | __be32 *psfsrc) |
1da177e4 LT |
1778 | { |
1779 | struct ip_sf_list *psf, *psf_prev; | |
1780 | int rv = 0; | |
1781 | ||
1782 | psf_prev = NULL; | |
c71151f0 | 1783 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1784 | if (psf->sf_inaddr == *psfsrc) |
1785 | break; | |
1786 | psf_prev = psf; | |
1787 | } | |
1788 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1789 | /* source filter not found, or count wrong => bug */ | |
1790 | return -ESRCH; | |
1791 | } | |
1792 | psf->sf_count[sfmode]--; | |
1793 | if (psf->sf_count[sfmode] == 0) { | |
1794 | ip_rt_multicast_event(pmc->interface); | |
1795 | } | |
1796 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1797 | #ifdef CONFIG_IP_MULTICAST | |
1798 | struct in_device *in_dev = pmc->interface; | |
165094af | 1799 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1800 | #endif |
1801 | ||
1802 | /* no more filters for this source */ | |
1803 | if (psf_prev) | |
1804 | psf_prev->sf_next = psf->sf_next; | |
1805 | else | |
1806 | pmc->sources = psf->sf_next; | |
1807 | #ifdef CONFIG_IP_MULTICAST | |
1808 | if (psf->sf_oldin && | |
1809 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
165094af | 1810 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1811 | psf->sf_next = pmc->tomb; |
1812 | pmc->tomb = psf; | |
1813 | rv = 1; | |
1814 | } else | |
1815 | #endif | |
1816 | kfree(psf); | |
1817 | } | |
1818 | return rv; | |
1819 | } | |
1820 | ||
1821 | #ifndef CONFIG_IP_MULTICAST | |
1822 | #define igmp_ifc_event(x) do { } while (0) | |
1823 | #endif | |
1824 | ||
8f935bbd AV |
1825 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1826 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1827 | { |
1828 | struct ip_mc_list *pmc; | |
1829 | int changerec = 0; | |
1830 | int i, err; | |
1831 | ||
1832 | if (!in_dev) | |
1833 | return -ENODEV; | |
1d7138de ED |
1834 | rcu_read_lock(); |
1835 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1836 | if (*pmca == pmc->multiaddr) |
1837 | break; | |
1838 | } | |
1839 | if (!pmc) { | |
1840 | /* MCA not found?? bug */ | |
1d7138de | 1841 | rcu_read_unlock(); |
1da177e4 LT |
1842 | return -ESRCH; |
1843 | } | |
1844 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1845 | rcu_read_unlock(); |
1da177e4 LT |
1846 | #ifdef CONFIG_IP_MULTICAST |
1847 | sf_markstate(pmc); | |
1848 | #endif | |
1849 | if (!delta) { | |
1850 | err = -EINVAL; | |
1851 | if (!pmc->sfcount[sfmode]) | |
1852 | goto out_unlock; | |
1853 | pmc->sfcount[sfmode]--; | |
1854 | } | |
1855 | err = 0; | |
c71151f0 | 1856 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
1857 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
1858 | ||
1859 | changerec |= rv > 0; | |
1860 | if (!err && rv < 0) | |
1861 | err = rv; | |
1862 | } | |
1863 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1864 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1865 | pmc->sfcount[MCAST_INCLUDE]) { | |
1866 | #ifdef CONFIG_IP_MULTICAST | |
1867 | struct ip_sf_list *psf; | |
165094af | 1868 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1869 | #endif |
1870 | ||
1871 | /* filter mode change */ | |
1872 | pmc->sfmode = MCAST_INCLUDE; | |
1873 | #ifdef CONFIG_IP_MULTICAST | |
165094af | 1874 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1875 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 1876 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1877 | psf->sf_crcount = 0; |
1878 | igmp_ifc_event(pmc->interface); | |
1879 | } else if (sf_setstate(pmc) || changerec) { | |
1880 | igmp_ifc_event(pmc->interface); | |
1881 | #endif | |
1882 | } | |
1883 | out_unlock: | |
1884 | spin_unlock_bh(&pmc->lock); | |
1885 | return err; | |
1886 | } | |
1887 | ||
1888 | /* | |
1889 | * Add multicast single-source filter to the interface list | |
1890 | */ | |
1891 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1892 | __be32 *psfsrc) |
1da177e4 LT |
1893 | { |
1894 | struct ip_sf_list *psf, *psf_prev; | |
1895 | ||
1896 | psf_prev = NULL; | |
c71151f0 | 1897 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1898 | if (psf->sf_inaddr == *psfsrc) |
1899 | break; | |
1900 | psf_prev = psf; | |
1901 | } | |
1902 | if (!psf) { | |
0da974f4 | 1903 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1904 | if (!psf) |
1905 | return -ENOBUFS; | |
1da177e4 LT |
1906 | psf->sf_inaddr = *psfsrc; |
1907 | if (psf_prev) { | |
1908 | psf_prev->sf_next = psf; | |
1909 | } else | |
1910 | pmc->sources = psf; | |
1911 | } | |
1912 | psf->sf_count[sfmode]++; | |
1913 | if (psf->sf_count[sfmode] == 1) { | |
1914 | ip_rt_multicast_event(pmc->interface); | |
1915 | } | |
1916 | return 0; | |
1917 | } | |
1918 | ||
1919 | #ifdef CONFIG_IP_MULTICAST | |
1920 | static void sf_markstate(struct ip_mc_list *pmc) | |
1921 | { | |
1922 | struct ip_sf_list *psf; | |
1923 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1924 | ||
c71151f0 | 1925 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1926 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1927 | psf->sf_oldin = mca_xcount == | |
1928 | psf->sf_count[MCAST_EXCLUDE] && | |
1929 | !psf->sf_count[MCAST_INCLUDE]; | |
1930 | } else | |
1931 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1932 | } | |
1933 | ||
1934 | static int sf_setstate(struct ip_mc_list *pmc) | |
1935 | { | |
ad12583f | 1936 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1937 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1938 | int qrv = pmc->interface->mr_qrv; | |
1939 | int new_in, rv; | |
1940 | ||
1941 | rv = 0; | |
c71151f0 | 1942 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1943 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1944 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1945 | !psf->sf_count[MCAST_INCLUDE]; | |
1946 | } else | |
1947 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1948 | if (new_in) { |
1949 | if (!psf->sf_oldin) { | |
76edc605 | 1950 | struct ip_sf_list *prev = NULL; |
ad12583f | 1951 | |
c71151f0 | 1952 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
1953 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1954 | break; | |
1955 | prev = dpsf; | |
1956 | } | |
1957 | if (dpsf) { | |
1958 | if (prev) | |
1959 | prev->sf_next = dpsf->sf_next; | |
1960 | else | |
1961 | pmc->tomb = dpsf->sf_next; | |
1962 | kfree(dpsf); | |
1963 | } | |
1964 | psf->sf_crcount = qrv; | |
1965 | rv++; | |
1966 | } | |
1967 | } else if (psf->sf_oldin) { | |
1968 | ||
1969 | psf->sf_crcount = 0; | |
1970 | /* | |
1971 | * add or update "delete" records if an active filter | |
1972 | * is now inactive | |
1973 | */ | |
c71151f0 | 1974 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
1975 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1976 | break; | |
1977 | if (!dpsf) { | |
3ed37a6f | 1978 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1979 | if (!dpsf) |
1980 | continue; | |
1981 | *dpsf = *psf; | |
1982 | /* pmc->lock held by callers */ | |
1983 | dpsf->sf_next = pmc->tomb; | |
1984 | pmc->tomb = dpsf; | |
1985 | } | |
1986 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1987 | rv++; |
1988 | } | |
1989 | } | |
1990 | return rv; | |
1991 | } | |
1992 | #endif | |
1993 | ||
1994 | /* | |
1995 | * Add multicast source filter list to the interface list | |
1996 | */ | |
8f935bbd AV |
1997 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1998 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1999 | { |
2000 | struct ip_mc_list *pmc; | |
2001 | int isexclude; | |
2002 | int i, err; | |
2003 | ||
2004 | if (!in_dev) | |
2005 | return -ENODEV; | |
1d7138de ED |
2006 | rcu_read_lock(); |
2007 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
2008 | if (*pmca == pmc->multiaddr) |
2009 | break; | |
2010 | } | |
2011 | if (!pmc) { | |
2012 | /* MCA not found?? bug */ | |
1d7138de | 2013 | rcu_read_unlock(); |
1da177e4 LT |
2014 | return -ESRCH; |
2015 | } | |
2016 | spin_lock_bh(&pmc->lock); | |
1d7138de | 2017 | rcu_read_unlock(); |
1da177e4 LT |
2018 | |
2019 | #ifdef CONFIG_IP_MULTICAST | |
2020 | sf_markstate(pmc); | |
2021 | #endif | |
2022 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
2023 | if (!delta) | |
2024 | pmc->sfcount[sfmode]++; | |
2025 | err = 0; | |
c71151f0 | 2026 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 2027 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
2028 | if (err) |
2029 | break; | |
2030 | } | |
2031 | if (err) { | |
2032 | int j; | |
2033 | ||
685f94e6 JZ |
2034 | if (!delta) |
2035 | pmc->sfcount[sfmode]--; | |
c71151f0 | 2036 | for (j = 0; j < i; j++) |
a1889c0d | 2037 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
2038 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
2039 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 2040 | struct ip_sf_list *psf; |
165094af | 2041 | struct net *net = dev_net(pmc->interface->dev); |
cfcabdcc | 2042 | in_dev = pmc->interface; |
1da177e4 LT |
2043 | #endif |
2044 | ||
2045 | /* filter mode change */ | |
2046 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
2047 | pmc->sfmode = MCAST_EXCLUDE; | |
2048 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
2049 | pmc->sfmode = MCAST_INCLUDE; | |
2050 | #ifdef CONFIG_IP_MULTICAST | |
2051 | /* else no filters; keep old mode for reports */ | |
2052 | ||
165094af | 2053 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 2054 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 2055 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2056 | psf->sf_crcount = 0; |
2057 | igmp_ifc_event(in_dev); | |
2058 | } else if (sf_setstate(pmc)) { | |
2059 | igmp_ifc_event(in_dev); | |
2060 | #endif | |
2061 | } | |
2062 | spin_unlock_bh(&pmc->lock); | |
2063 | return err; | |
2064 | } | |
2065 | ||
2066 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
2067 | { | |
2068 | struct ip_sf_list *psf, *nextpsf; | |
2069 | ||
c71151f0 | 2070 | for (psf = pmc->tomb; psf; psf = nextpsf) { |
1da177e4 LT |
2071 | nextpsf = psf->sf_next; |
2072 | kfree(psf); | |
2073 | } | |
2074 | pmc->tomb = NULL; | |
c71151f0 | 2075 | for (psf = pmc->sources; psf; psf = nextpsf) { |
1da177e4 LT |
2076 | nextpsf = psf->sf_next; |
2077 | kfree(psf); | |
2078 | } | |
2079 | pmc->sources = NULL; | |
2080 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 2081 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
2082 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
2083 | } | |
2084 | ||
54ff9ef3 MRL |
2085 | /* Join a multicast group |
2086 | */ | |
2087 | ||
2088 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
1da177e4 | 2089 | { |
8f935bbd | 2090 | __be32 addr = imr->imr_multiaddr.s_addr; |
959d10f6 | 2091 | struct ip_mc_socklist *iml, *i; |
1da177e4 LT |
2092 | struct in_device *in_dev; |
2093 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 2094 | struct net *net = sock_net(sk); |
ca9b907d | 2095 | int ifindex; |
1da177e4 | 2096 | int count = 0; |
959d10f6 ED |
2097 | int err; |
2098 | ||
2099 | ASSERT_RTNL(); | |
1da177e4 | 2100 | |
f97c1e0c | 2101 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2102 | return -EINVAL; |
2103 | ||
877acedc | 2104 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
2105 | |
2106 | if (!in_dev) { | |
1da177e4 LT |
2107 | err = -ENODEV; |
2108 | goto done; | |
2109 | } | |
2110 | ||
1da177e4 | 2111 | err = -EADDRINUSE; |
ca9b907d | 2112 | ifindex = imr->imr_ifindex; |
1d7138de | 2113 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
2114 | if (i->multi.imr_multiaddr.s_addr == addr && |
2115 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 2116 | goto done; |
1da177e4 LT |
2117 | count++; |
2118 | } | |
2119 | err = -ENOBUFS; | |
815c5270 | 2120 | if (count >= net->ipv4.sysctl_igmp_max_memberships) |
ca9b907d | 2121 | goto done; |
a7e9ff73 | 2122 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
51456b29 | 2123 | if (!iml) |
1da177e4 | 2124 | goto done; |
ca9b907d | 2125 | |
1da177e4 | 2126 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 2127 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
2128 | iml->sflist = NULL; |
2129 | iml->sfmode = MCAST_EXCLUDE; | |
cf778b00 | 2130 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 2131 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 2132 | err = 0; |
1da177e4 | 2133 | done: |
1da177e4 LT |
2134 | return err; |
2135 | } | |
4bc2f18b | 2136 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
2137 | |
2138 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
2139 | struct in_device *in_dev) | |
2140 | { | |
1d7138de | 2141 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
2142 | int err; |
2143 | ||
51456b29 | 2144 | if (!psf) { |
1da177e4 LT |
2145 | /* any-source empty exclude case */ |
2146 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2147 | iml->sfmode, 0, NULL, 0); | |
2148 | } | |
2149 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 2150 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 2151 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
2152 | /* decrease mem now to avoid the memleak warning */ |
2153 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2154 | kfree_rcu(psf, rcu); |
1da177e4 LT |
2155 | return err; |
2156 | } | |
2157 | ||
54ff9ef3 | 2158 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
1da177e4 LT |
2159 | { |
2160 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
2161 | struct ip_mc_socklist *iml; |
2162 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 2163 | struct in_device *in_dev; |
877acedc | 2164 | struct net *net = sock_net(sk); |
8f935bbd | 2165 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 2166 | u32 ifindex; |
acd6e00b | 2167 | int ret = -EADDRNOTAVAIL; |
1da177e4 | 2168 | |
959d10f6 ED |
2169 | ASSERT_RTNL(); |
2170 | ||
877acedc | 2171 | in_dev = ip_mc_find_dev(net, imr); |
4eba7bb1 | 2172 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
52ad353a | 2173 | ret = -ENODEV; |
2174 | goto out; | |
2175 | } | |
84b42bae | 2176 | ifindex = imr->imr_ifindex; |
1d7138de ED |
2177 | for (imlp = &inet->mc_list; |
2178 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2179 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
2180 | if (iml->multi.imr_multiaddr.s_addr != group) |
2181 | continue; | |
2182 | if (ifindex) { | |
2183 | if (iml->multi.imr_ifindex != ifindex) | |
2184 | continue; | |
2185 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2186 | iml->multi.imr_address.s_addr) | |
2187 | continue; | |
1da177e4 | 2188 | |
acd6e00b | 2189 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 2190 | |
1d7138de | 2191 | *imlp = iml->next_rcu; |
acd6e00b | 2192 | |
4eba7bb1 AL |
2193 | if (in_dev) |
2194 | ip_mc_dec_group(in_dev, group); | |
959d10f6 | 2195 | |
c85bb41e FL |
2196 | /* decrease mem now to avoid the memleak warning */ |
2197 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2198 | kfree_rcu(iml, rcu); |
acd6e00b | 2199 | return 0; |
1da177e4 | 2200 | } |
52ad353a | 2201 | out: |
959d10f6 ED |
2202 | return ret; |
2203 | } | |
193ba924 | 2204 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
2205 | |
2206 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2207 | ip_mreq_source *mreqs, int ifindex) | |
2208 | { | |
2209 | int err; | |
2210 | struct ip_mreqn imr; | |
63007727 | 2211 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
2212 | struct ip_mc_socklist *pmc; |
2213 | struct in_device *in_dev = NULL; | |
2214 | struct inet_sock *inet = inet_sk(sk); | |
2215 | struct ip_sf_socklist *psl; | |
877acedc | 2216 | struct net *net = sock_net(sk); |
8cdaaa15 | 2217 | int leavegroup = 0; |
1da177e4 LT |
2218 | int i, j, rv; |
2219 | ||
f97c1e0c | 2220 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2221 | return -EINVAL; |
2222 | ||
54ff9ef3 | 2223 | ASSERT_RTNL(); |
1da177e4 LT |
2224 | |
2225 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2226 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2227 | imr.imr_ifindex = ifindex; | |
877acedc | 2228 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2229 | |
2230 | if (!in_dev) { | |
2231 | err = -ENODEV; | |
2232 | goto done; | |
2233 | } | |
2234 | err = -EADDRNOTAVAIL; | |
2235 | ||
1d7138de | 2236 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2237 | if ((pmc->multi.imr_multiaddr.s_addr == |
2238 | imr.imr_multiaddr.s_addr) && | |
2239 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2240 | break; |
2241 | } | |
917f2f10 DS |
2242 | if (!pmc) { /* must have a prior join */ |
2243 | err = -EINVAL; | |
1da177e4 | 2244 | goto done; |
917f2f10 | 2245 | } |
1da177e4 LT |
2246 | /* if a source filter was set, must be the same mode as before */ |
2247 | if (pmc->sflist) { | |
917f2f10 DS |
2248 | if (pmc->sfmode != omode) { |
2249 | err = -EINVAL; | |
1da177e4 | 2250 | goto done; |
917f2f10 | 2251 | } |
1da177e4 LT |
2252 | } else if (pmc->sfmode != omode) { |
2253 | /* allow mode switches for empty-set filters */ | |
2254 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2255 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2256 | NULL, 0); |
2257 | pmc->sfmode = omode; | |
2258 | } | |
2259 | ||
1d7138de | 2260 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2261 | if (!add) { |
2262 | if (!psl) | |
917f2f10 | 2263 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2264 | rv = !0; |
c71151f0 | 2265 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2266 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2267 | sizeof(__be32)); |
1da177e4 LT |
2268 | if (rv == 0) |
2269 | break; | |
2270 | } | |
2271 | if (rv) /* source not found */ | |
917f2f10 | 2272 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2273 | |
8cdaaa15 DS |
2274 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2275 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2276 | leavegroup = 1; | |
2277 | goto done; | |
2278 | } | |
2279 | ||
1da177e4 | 2280 | /* update the interface filter */ |
e905a9ed | 2281 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2282 | &mreqs->imr_sourceaddr, 1); |
2283 | ||
c71151f0 | 2284 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2285 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2286 | psl->sl_count--; | |
2287 | err = 0; | |
2288 | goto done; | |
2289 | } | |
2290 | /* else, add a new source to the filter */ | |
2291 | ||
166b6b2d | 2292 | if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { |
1da177e4 LT |
2293 | err = -ENOBUFS; |
2294 | goto done; | |
2295 | } | |
2296 | if (!psl || psl->sl_count == psl->sl_max) { | |
2297 | struct ip_sf_socklist *newpsl; | |
2298 | int count = IP_SFBLOCK; | |
2299 | ||
2300 | if (psl) | |
2301 | count += psl->sl_max; | |
8b3a7005 | 2302 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2303 | if (!newpsl) { |
2304 | err = -ENOBUFS; | |
2305 | goto done; | |
2306 | } | |
2307 | newpsl->sl_max = count; | |
2308 | newpsl->sl_count = count - IP_SFBLOCK; | |
2309 | if (psl) { | |
c71151f0 | 2310 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2311 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e FL |
2312 | /* decrease mem now to avoid the memleak warning */ |
2313 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2314 | kfree_rcu(psl, rcu); |
1da177e4 | 2315 | } |
cf778b00 | 2316 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2317 | psl = newpsl; |
1da177e4 LT |
2318 | } |
2319 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2320 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2321 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2322 | sizeof(__be32)); |
1da177e4 LT |
2323 | if (rv == 0) |
2324 | break; | |
2325 | } | |
2326 | if (rv == 0) /* address already there is an error */ | |
2327 | goto done; | |
c71151f0 | 2328 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2329 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2330 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2331 | psl->sl_count++; | |
2332 | err = 0; | |
2333 | /* update the interface list */ | |
e905a9ed | 2334 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2335 | &mreqs->imr_sourceaddr, 1); |
2336 | done: | |
8cdaaa15 | 2337 | if (leavegroup) |
54ff9ef3 | 2338 | err = ip_mc_leave_group(sk, &imr); |
1da177e4 LT |
2339 | return err; |
2340 | } | |
2341 | ||
2342 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2343 | { | |
9951f036 | 2344 | int err = 0; |
1da177e4 | 2345 | struct ip_mreqn imr; |
63007727 | 2346 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2347 | struct ip_mc_socklist *pmc; |
2348 | struct in_device *in_dev; | |
2349 | struct inet_sock *inet = inet_sk(sk); | |
2350 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2351 | struct net *net = sock_net(sk); |
9951f036 | 2352 | int leavegroup = 0; |
1da177e4 | 2353 | |
f97c1e0c | 2354 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2355 | return -EINVAL; |
2356 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2357 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2358 | return -EINVAL; | |
2359 | ||
54ff9ef3 | 2360 | ASSERT_RTNL(); |
1da177e4 LT |
2361 | |
2362 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2363 | imr.imr_address.s_addr = msf->imsf_interface; | |
2364 | imr.imr_ifindex = ifindex; | |
877acedc | 2365 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2366 | |
2367 | if (!in_dev) { | |
2368 | err = -ENODEV; | |
2369 | goto done; | |
2370 | } | |
1da177e4 | 2371 | |
9951f036 DS |
2372 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2373 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2374 | leavegroup = 1; | |
2375 | goto done; | |
2376 | } | |
2377 | ||
1d7138de | 2378 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2379 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2380 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2381 | break; | |
2382 | } | |
917f2f10 DS |
2383 | if (!pmc) { /* must have a prior join */ |
2384 | err = -EINVAL; | |
1da177e4 | 2385 | goto done; |
917f2f10 | 2386 | } |
1da177e4 | 2387 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2388 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2389 | GFP_KERNEL); | |
1da177e4 LT |
2390 | if (!newpsl) { |
2391 | err = -ENOBUFS; | |
2392 | goto done; | |
2393 | } | |
2394 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2395 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2396 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2397 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2398 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2399 | if (err) { | |
2400 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2401 | goto done; | |
2402 | } | |
8713dbf0 | 2403 | } else { |
1da177e4 | 2404 | newpsl = NULL; |
8713dbf0 YZ |
2405 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2406 | msf->imsf_fmode, 0, NULL, 0); | |
2407 | } | |
1d7138de | 2408 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2409 | if (psl) { |
2410 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2411 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2412 | /* decrease mem now to avoid the memleak warning */ |
2413 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2414 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2415 | } else |
2416 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2417 | 0, NULL, 0); | |
cf778b00 | 2418 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2419 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2420 | err = 0; |
1da177e4 | 2421 | done: |
9951f036 DS |
2422 | if (leavegroup) |
2423 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2424 | return err; |
2425 | } | |
2426 | ||
2427 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2428 | struct ip_msfilter __user *optval, int __user *optlen) | |
2429 | { | |
2430 | int err, len, count, copycount; | |
2431 | struct ip_mreqn imr; | |
63007727 | 2432 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2433 | struct ip_mc_socklist *pmc; |
2434 | struct in_device *in_dev; | |
2435 | struct inet_sock *inet = inet_sk(sk); | |
2436 | struct ip_sf_socklist *psl; | |
877acedc | 2437 | struct net *net = sock_net(sk); |
1da177e4 | 2438 | |
87e9f031 WC |
2439 | ASSERT_RTNL(); |
2440 | ||
f97c1e0c | 2441 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2442 | return -EINVAL; |
2443 | ||
1da177e4 LT |
2444 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
2445 | imr.imr_address.s_addr = msf->imsf_interface; | |
2446 | imr.imr_ifindex = 0; | |
877acedc | 2447 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2448 | |
2449 | if (!in_dev) { | |
2450 | err = -ENODEV; | |
2451 | goto done; | |
2452 | } | |
2453 | err = -EADDRNOTAVAIL; | |
2454 | ||
1d7138de | 2455 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2456 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2457 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2458 | break; | |
2459 | } | |
2460 | if (!pmc) /* must have a prior join */ | |
2461 | goto done; | |
2462 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2463 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2464 | if (!psl) { |
2465 | len = 0; | |
2466 | count = 0; | |
2467 | } else { | |
2468 | count = psl->sl_count; | |
2469 | } | |
2470 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2471 | len = copycount * sizeof(psl->sl_addr[0]); | |
2472 | msf->imsf_numsrc = count; | |
2473 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2474 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2475 | return -EFAULT; | |
2476 | } | |
2477 | if (len && | |
2478 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2479 | return -EFAULT; | |
2480 | return 0; | |
2481 | done: | |
1da177e4 LT |
2482 | return err; |
2483 | } | |
2484 | ||
2485 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2486 | struct group_filter __user *optval, int __user *optlen) | |
2487 | { | |
2488 | int err, i, count, copycount; | |
2489 | struct sockaddr_in *psin; | |
63007727 | 2490 | __be32 addr; |
1da177e4 LT |
2491 | struct ip_mc_socklist *pmc; |
2492 | struct inet_sock *inet = inet_sk(sk); | |
2493 | struct ip_sf_socklist *psl; | |
2494 | ||
87e9f031 WC |
2495 | ASSERT_RTNL(); |
2496 | ||
1da177e4 LT |
2497 | psin = (struct sockaddr_in *)&gsf->gf_group; |
2498 | if (psin->sin_family != AF_INET) | |
2499 | return -EINVAL; | |
2500 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2501 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2502 | return -EINVAL; |
2503 | ||
1da177e4 LT |
2504 | err = -EADDRNOTAVAIL; |
2505 | ||
1d7138de | 2506 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2507 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2508 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2509 | break; | |
2510 | } | |
2511 | if (!pmc) /* must have a prior join */ | |
2512 | goto done; | |
2513 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2514 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2515 | count = psl ? psl->sl_count : 0; |
2516 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2517 | gsf->gf_numsrc = count; | |
2518 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2519 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2520 | return -EFAULT; | |
2521 | } | |
c71151f0 | 2522 | for (i = 0; i < copycount; i++) { |
1da177e4 LT |
2523 | struct sockaddr_storage ss; |
2524 | ||
2525 | psin = (struct sockaddr_in *)&ss; | |
2526 | memset(&ss, 0, sizeof(ss)); | |
2527 | psin->sin_family = AF_INET; | |
2528 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2529 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2530 | return -EFAULT; | |
2531 | } | |
2532 | return 0; | |
2533 | done: | |
1da177e4 LT |
2534 | return err; |
2535 | } | |
2536 | ||
2537 | /* | |
2538 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2539 | */ | |
c0cda068 | 2540 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2541 | { |
2542 | struct inet_sock *inet = inet_sk(sk); | |
2543 | struct ip_mc_socklist *pmc; | |
2544 | struct ip_sf_socklist *psl; | |
2545 | int i; | |
c85bb41e | 2546 | int ret; |
1da177e4 | 2547 | |
c85bb41e | 2548 | ret = 1; |
f97c1e0c | 2549 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2550 | goto out; |
1da177e4 | 2551 | |
c85bb41e | 2552 | rcu_read_lock(); |
1d7138de | 2553 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2554 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2555 | pmc->multi.imr_ifindex == dif) | |
2556 | break; | |
2557 | } | |
c85bb41e | 2558 | ret = inet->mc_all; |
1da177e4 | 2559 | if (!pmc) |
c85bb41e | 2560 | goto unlock; |
1d7138de | 2561 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2562 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2563 | if (!psl) |
c85bb41e | 2564 | goto unlock; |
1da177e4 | 2565 | |
c71151f0 | 2566 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2567 | if (psl->sl_addr[i] == rmt_addr) |
2568 | break; | |
2569 | } | |
c85bb41e | 2570 | ret = 0; |
1da177e4 | 2571 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2572 | goto unlock; |
1da177e4 | 2573 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2574 | goto unlock; |
2575 | ret = 1; | |
2576 | unlock: | |
2577 | rcu_read_unlock(); | |
2578 | out: | |
2579 | return ret; | |
1da177e4 LT |
2580 | } |
2581 | ||
2582 | /* | |
2583 | * A socket is closing. | |
2584 | */ | |
2585 | ||
2586 | void ip_mc_drop_socket(struct sock *sk) | |
2587 | { | |
2588 | struct inet_sock *inet = inet_sk(sk); | |
2589 | struct ip_mc_socklist *iml; | |
877acedc | 2590 | struct net *net = sock_net(sk); |
1da177e4 | 2591 | |
51456b29 | 2592 | if (!inet->mc_list) |
1da177e4 LT |
2593 | return; |
2594 | ||
2595 | rtnl_lock(); | |
1d7138de | 2596 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2597 | struct in_device *in_dev; |
1da177e4 | 2598 | |
1d7138de | 2599 | inet->mc_list = iml->next_rcu; |
877acedc | 2600 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2601 | (void) ip_mc_leave_src(sk, iml, in_dev); |
00db4124 | 2602 | if (in_dev) |
1da177e4 | 2603 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2604 | /* decrease mem now to avoid the memleak warning */ |
2605 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2606 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2607 | } |
2608 | rtnl_unlock(); | |
2609 | } | |
2610 | ||
dbdd9a52 | 2611 | /* called with rcu_read_lock() */ |
2094acbb | 2612 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
1da177e4 LT |
2613 | { |
2614 | struct ip_mc_list *im; | |
e9897071 | 2615 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2616 | struct ip_sf_list *psf; |
2617 | int rv = 0; | |
2618 | ||
e9897071 ED |
2619 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2620 | if (mc_hash) { | |
c70eba74 | 2621 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2622 | |
2623 | for (im = rcu_dereference(mc_hash[hash]); | |
2624 | im != NULL; | |
2625 | im = rcu_dereference(im->next_hash)) { | |
2626 | if (im->multiaddr == mc_addr) | |
2627 | break; | |
2628 | } | |
2629 | } else { | |
2630 | for_each_pmc_rcu(in_dev, im) { | |
2631 | if (im->multiaddr == mc_addr) | |
2632 | break; | |
2633 | } | |
1da177e4 LT |
2634 | } |
2635 | if (im && proto == IPPROTO_IGMP) { | |
2636 | rv = 1; | |
2637 | } else if (im) { | |
2638 | if (src_addr) { | |
c71151f0 | 2639 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2640 | if (psf->sf_inaddr == src_addr) |
2641 | break; | |
2642 | } | |
2643 | if (psf) | |
2644 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2645 | psf->sf_count[MCAST_EXCLUDE] != | |
2646 | im->sfcount[MCAST_EXCLUDE]; | |
2647 | else | |
2648 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2649 | } else | |
2650 | rv = 1; /* unspecified source; tentatively allow */ | |
2651 | } | |
1da177e4 LT |
2652 | return rv; |
2653 | } | |
2654 | ||
2655 | #if defined(CONFIG_PROC_FS) | |
2656 | struct igmp_mc_iter_state { | |
7091e728 | 2657 | struct seq_net_private p; |
1da177e4 LT |
2658 | struct net_device *dev; |
2659 | struct in_device *in_dev; | |
2660 | }; | |
2661 | ||
2662 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2663 | ||
2664 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2665 | { | |
7091e728 | 2666 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2667 | struct ip_mc_list *im = NULL; |
2668 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2669 | ||
7562f876 | 2670 | state->in_dev = NULL; |
61fbab77 | 2671 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2672 | struct in_device *in_dev; |
6baff150 ED |
2673 | |
2674 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2675 | if (!in_dev) |
2676 | continue; | |
1d7138de | 2677 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2678 | if (im) { |
2679 | state->in_dev = in_dev; | |
2680 | break; | |
2681 | } | |
1da177e4 LT |
2682 | } |
2683 | return im; | |
2684 | } | |
2685 | ||
2686 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2687 | { | |
2688 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2689 | |
1d7138de ED |
2690 | im = rcu_dereference(im->next_rcu); |
2691 | while (!im) { | |
6baff150 | 2692 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2693 | if (!state->dev) { |
2694 | state->in_dev = NULL; | |
2695 | break; | |
2696 | } | |
6baff150 | 2697 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2698 | if (!state->in_dev) |
2699 | continue; | |
1d7138de | 2700 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2701 | } |
2702 | return im; | |
2703 | } | |
2704 | ||
2705 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2706 | { | |
2707 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2708 | if (im) | |
2709 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2710 | --pos; | |
2711 | return pos ? NULL : im; | |
2712 | } | |
2713 | ||
2714 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2715 | __acquires(rcu) |
1da177e4 | 2716 | { |
61fbab77 | 2717 | rcu_read_lock(); |
1da177e4 LT |
2718 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2719 | } | |
2720 | ||
2721 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2722 | { | |
2723 | struct ip_mc_list *im; | |
2724 | if (v == SEQ_START_TOKEN) | |
2725 | im = igmp_mc_get_first(seq); | |
2726 | else | |
2727 | im = igmp_mc_get_next(seq, v); | |
2728 | ++*pos; | |
2729 | return im; | |
2730 | } | |
2731 | ||
2732 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2733 | __releases(rcu) |
1da177e4 LT |
2734 | { |
2735 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2736 | |
2737 | state->in_dev = NULL; | |
1da177e4 | 2738 | state->dev = NULL; |
61fbab77 | 2739 | rcu_read_unlock(); |
1da177e4 LT |
2740 | } |
2741 | ||
2742 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2743 | { | |
2744 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2745 | seq_puts(seq, |
1da177e4 LT |
2746 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2747 | else { | |
2748 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2749 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2750 | char *querier; | |
a399a805 ED |
2751 | long delta; |
2752 | ||
1da177e4 LT |
2753 | #ifdef CONFIG_IP_MULTICAST |
2754 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2755 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2756 | "V3"; | |
2757 | #else | |
2758 | querier = "NONE"; | |
2759 | #endif | |
2760 | ||
e6b68883 | 2761 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2762 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2763 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2764 | } |
2765 | ||
a399a805 | 2766 | delta = im->timer.expires - jiffies; |
1da177e4 | 2767 | seq_printf(seq, |
338fcf98 | 2768 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2769 | im->multiaddr, im->users, |
a399a805 ED |
2770 | im->tm_running, |
2771 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2772 | im->reporter); |
2773 | } | |
2774 | return 0; | |
2775 | } | |
2776 | ||
f690808e | 2777 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2778 | .start = igmp_mc_seq_start, |
2779 | .next = igmp_mc_seq_next, | |
2780 | .stop = igmp_mc_seq_stop, | |
2781 | .show = igmp_mc_seq_show, | |
2782 | }; | |
2783 | ||
2784 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2785 | { | |
7091e728 | 2786 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2787 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2788 | } |
2789 | ||
9a32144e | 2790 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2791 | .owner = THIS_MODULE, |
2792 | .open = igmp_mc_seq_open, | |
2793 | .read = seq_read, | |
2794 | .llseek = seq_lseek, | |
7091e728 | 2795 | .release = seq_release_net, |
1da177e4 LT |
2796 | }; |
2797 | ||
2798 | struct igmp_mcf_iter_state { | |
7091e728 | 2799 | struct seq_net_private p; |
1da177e4 LT |
2800 | struct net_device *dev; |
2801 | struct in_device *idev; | |
2802 | struct ip_mc_list *im; | |
2803 | }; | |
2804 | ||
2805 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2806 | ||
2807 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2808 | { | |
7091e728 | 2809 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2810 | struct ip_sf_list *psf = NULL; |
2811 | struct ip_mc_list *im = NULL; | |
2812 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2813 | ||
7562f876 PE |
2814 | state->idev = NULL; |
2815 | state->im = NULL; | |
61fbab77 | 2816 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2817 | struct in_device *idev; |
6baff150 | 2818 | idev = __in_dev_get_rcu(state->dev); |
51456b29 | 2819 | if (unlikely(!idev)) |
1da177e4 | 2820 | continue; |
1d7138de | 2821 | im = rcu_dereference(idev->mc_list); |
00db4124 | 2822 | if (likely(im)) { |
1da177e4 LT |
2823 | spin_lock_bh(&im->lock); |
2824 | psf = im->sources; | |
00db4124 | 2825 | if (likely(psf)) { |
1da177e4 LT |
2826 | state->im = im; |
2827 | state->idev = idev; | |
2828 | break; | |
2829 | } | |
2830 | spin_unlock_bh(&im->lock); | |
2831 | } | |
1da177e4 LT |
2832 | } |
2833 | return psf; | |
2834 | } | |
2835 | ||
2836 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2837 | { | |
2838 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2839 | ||
2840 | psf = psf->sf_next; | |
2841 | while (!psf) { | |
2842 | spin_unlock_bh(&state->im->lock); | |
2843 | state->im = state->im->next; | |
2844 | while (!state->im) { | |
6baff150 | 2845 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2846 | if (!state->dev) { |
2847 | state->idev = NULL; | |
2848 | goto out; | |
2849 | } | |
6baff150 | 2850 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2851 | if (!state->idev) |
2852 | continue; | |
1d7138de | 2853 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2854 | } |
2855 | if (!state->im) | |
2856 | break; | |
2857 | spin_lock_bh(&state->im->lock); | |
2858 | psf = state->im->sources; | |
2859 | } | |
2860 | out: | |
2861 | return psf; | |
2862 | } | |
2863 | ||
2864 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2865 | { | |
2866 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2867 | if (psf) | |
2868 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2869 | --pos; | |
2870 | return pos ? NULL : psf; | |
2871 | } | |
2872 | ||
2873 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2874 | __acquires(rcu) |
1da177e4 | 2875 | { |
61fbab77 | 2876 | rcu_read_lock(); |
1da177e4 LT |
2877 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2878 | } | |
2879 | ||
2880 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2881 | { | |
2882 | struct ip_sf_list *psf; | |
2883 | if (v == SEQ_START_TOKEN) | |
2884 | psf = igmp_mcf_get_first(seq); | |
2885 | else | |
2886 | psf = igmp_mcf_get_next(seq, v); | |
2887 | ++*pos; | |
2888 | return psf; | |
2889 | } | |
2890 | ||
2891 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2892 | __releases(rcu) |
1da177e4 LT |
2893 | { |
2894 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
00db4124 | 2895 | if (likely(state->im)) { |
1da177e4 LT |
2896 | spin_unlock_bh(&state->im->lock); |
2897 | state->im = NULL; | |
2898 | } | |
1d7138de | 2899 | state->idev = NULL; |
1da177e4 | 2900 | state->dev = NULL; |
61fbab77 | 2901 | rcu_read_unlock(); |
1da177e4 LT |
2902 | } |
2903 | ||
2904 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2905 | { | |
2906 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2907 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2908 | ||
2909 | if (v == SEQ_START_TOKEN) { | |
1744bea1 | 2910 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
1da177e4 LT |
2911 | } else { |
2912 | seq_printf(seq, | |
2913 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2914 | "0x%08x %6lu %6lu\n", |
2915 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2916 | ntohl(state->im->multiaddr), |
2917 | ntohl(psf->sf_inaddr), | |
2918 | psf->sf_count[MCAST_INCLUDE], | |
2919 | psf->sf_count[MCAST_EXCLUDE]); | |
2920 | } | |
2921 | return 0; | |
2922 | } | |
2923 | ||
f690808e | 2924 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2925 | .start = igmp_mcf_seq_start, |
2926 | .next = igmp_mcf_seq_next, | |
2927 | .stop = igmp_mcf_seq_stop, | |
2928 | .show = igmp_mcf_seq_show, | |
2929 | }; | |
2930 | ||
2931 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2932 | { | |
7091e728 | 2933 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2934 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2935 | } |
2936 | ||
9a32144e | 2937 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2938 | .owner = THIS_MODULE, |
2939 | .open = igmp_mcf_seq_open, | |
2940 | .read = seq_read, | |
2941 | .llseek = seq_lseek, | |
7091e728 | 2942 | .release = seq_release_net, |
1da177e4 LT |
2943 | }; |
2944 | ||
2c8c1e72 | 2945 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2946 | { |
7091e728 | 2947 | struct proc_dir_entry *pde; |
93a714d6 | 2948 | int err; |
7091e728 | 2949 | |
d4beaa66 | 2950 | pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); |
7091e728 AD |
2951 | if (!pde) |
2952 | goto out_igmp; | |
d4beaa66 G |
2953 | pde = proc_create("mcfilter", S_IRUGO, net->proc_net, |
2954 | &igmp_mcf_seq_fops); | |
7091e728 AD |
2955 | if (!pde) |
2956 | goto out_mcfilter; | |
93a714d6 MC |
2957 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
2958 | SOCK_DGRAM, 0, net); | |
2959 | if (err < 0) { | |
2960 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
2961 | err); | |
2962 | goto out_sock; | |
2963 | } | |
2964 | ||
dcd87999 NB |
2965 | /* Sysctl initialization */ |
2966 | net->ipv4.sysctl_igmp_max_memberships = 20; | |
2967 | net->ipv4.sysctl_igmp_max_msf = 10; | |
2968 | /* IGMP reports for link-local multicast groups are enabled by default */ | |
2969 | net->ipv4.sysctl_igmp_llm_reports = 1; | |
2970 | net->ipv4.sysctl_igmp_qrv = 2; | |
1da177e4 | 2971 | return 0; |
7091e728 | 2972 | |
93a714d6 MC |
2973 | out_sock: |
2974 | remove_proc_entry("mcfilter", net->proc_net); | |
7091e728 | 2975 | out_mcfilter: |
ece31ffd | 2976 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
2977 | out_igmp: |
2978 | return -ENOMEM; | |
2979 | } | |
2980 | ||
2c8c1e72 | 2981 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 2982 | { |
ece31ffd G |
2983 | remove_proc_entry("mcfilter", net->proc_net); |
2984 | remove_proc_entry("igmp", net->proc_net); | |
93a714d6 | 2985 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
7091e728 AD |
2986 | } |
2987 | ||
2988 | static struct pernet_operations igmp_net_ops = { | |
2989 | .init = igmp_net_init, | |
2990 | .exit = igmp_net_exit, | |
2991 | }; | |
72c1d3bd | 2992 | #endif |
7091e728 | 2993 | |
4aa5dee4 JP |
2994 | static int igmp_netdev_event(struct notifier_block *this, |
2995 | unsigned long event, void *ptr) | |
2996 | { | |
2997 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
2998 | struct in_device *in_dev; | |
2999 | ||
3000 | switch (event) { | |
3001 | case NETDEV_RESEND_IGMP: | |
3002 | in_dev = __in_dev_get_rtnl(dev); | |
3003 | if (in_dev) | |
3004 | ip_mc_rejoin_groups(in_dev); | |
3005 | break; | |
3006 | default: | |
3007 | break; | |
3008 | } | |
3009 | return NOTIFY_DONE; | |
3010 | } | |
3011 | ||
3012 | static struct notifier_block igmp_notifier = { | |
3013 | .notifier_call = igmp_netdev_event, | |
3014 | }; | |
3015 | ||
72c1d3bd | 3016 | int __init igmp_mc_init(void) |
7091e728 | 3017 | { |
72c1d3bd | 3018 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
3019 | int err; |
3020 | ||
3021 | err = register_pernet_subsys(&igmp_net_ops); | |
3022 | if (err) | |
3023 | return err; | |
3024 | err = register_netdevice_notifier(&igmp_notifier); | |
3025 | if (err) | |
3026 | goto reg_notif_fail; | |
3027 | return 0; | |
3028 | ||
3029 | reg_notif_fail: | |
3030 | unregister_pernet_subsys(&igmp_net_ops); | |
3031 | return err; | |
72c1d3bd WC |
3032 | #else |
3033 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 3034 | #endif |
72c1d3bd | 3035 | } |