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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
7c0f6ba6 | 75 | #include <linux/uaccess.h> |
1da177e4 LT |
76 | #include <linux/types.h> |
77 | #include <linux/kernel.h> | |
78 | #include <linux/jiffies.h> | |
79 | #include <linux/string.h> | |
80 | #include <linux/socket.h> | |
81 | #include <linux/sockios.h> | |
82 | #include <linux/in.h> | |
83 | #include <linux/inet.h> | |
84 | #include <linux/netdevice.h> | |
85 | #include <linux/skbuff.h> | |
86 | #include <linux/inetdevice.h> | |
87 | #include <linux/igmp.h> | |
88 | #include <linux/if_arp.h> | |
89 | #include <linux/rtnetlink.h> | |
90 | #include <linux/times.h> | |
9d4a0314 | 91 | #include <linux/pkt_sched.h> |
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; |
7ababb78 MT |
222 | unsigned long exp = jiffies + tv + 2; |
223 | ||
224 | if (in_dev->mr_gq_running && | |
225 | time_after_eq(exp, (in_dev->mr_gq_timer).expires)) | |
226 | return; | |
1da177e4 LT |
227 | |
228 | in_dev->mr_gq_running = 1; | |
7ababb78 | 229 | if (!mod_timer(&in_dev->mr_gq_timer, exp)) |
1da177e4 LT |
230 | in_dev_hold(in_dev); |
231 | } | |
232 | ||
233 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
234 | { | |
63862b5b | 235 | int tv = prandom_u32() % delay; |
1da177e4 LT |
236 | |
237 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
238 | in_dev_hold(in_dev); | |
239 | } | |
240 | ||
241 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
242 | { | |
243 | spin_lock_bh(&im->lock); | |
244 | im->unsolicit_count = 0; | |
245 | if (del_timer(&im->timer)) { | |
246 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
247 | add_timer(&im->timer); | |
a7e9ff73 | 248 | im->tm_running = 1; |
1da177e4 LT |
249 | spin_unlock_bh(&im->lock); |
250 | return; | |
251 | } | |
252 | atomic_dec(&im->refcnt); | |
253 | } | |
254 | igmp_start_timer(im, max_delay); | |
255 | spin_unlock_bh(&im->lock); | |
256 | } | |
257 | ||
258 | ||
259 | /* | |
260 | * Send an IGMP report. | |
261 | */ | |
262 | ||
263 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
264 | ||
265 | ||
266 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
267 | int gdeleted, int sdeleted) | |
268 | { | |
269 | switch (type) { | |
270 | case IGMPV3_MODE_IS_INCLUDE: | |
271 | case IGMPV3_MODE_IS_EXCLUDE: | |
272 | if (gdeleted || sdeleted) | |
273 | return 0; | |
ad12583f DS |
274 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
275 | if (pmc->sfmode == MCAST_INCLUDE) | |
276 | return 1; | |
277 | /* don't include if this source is excluded | |
278 | * in all filters | |
279 | */ | |
280 | if (psf->sf_count[MCAST_INCLUDE]) | |
281 | return type == IGMPV3_MODE_IS_INCLUDE; | |
282 | return pmc->sfcount[MCAST_EXCLUDE] == | |
283 | psf->sf_count[MCAST_EXCLUDE]; | |
284 | } | |
285 | return 0; | |
1da177e4 LT |
286 | case IGMPV3_CHANGE_TO_INCLUDE: |
287 | if (gdeleted || sdeleted) | |
288 | return 0; | |
289 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
290 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
291 | if (gdeleted || sdeleted) | |
292 | return 0; | |
293 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
294 | psf->sf_count[MCAST_INCLUDE]) | |
295 | return 0; | |
296 | return pmc->sfcount[MCAST_EXCLUDE] == | |
297 | psf->sf_count[MCAST_EXCLUDE]; | |
298 | case IGMPV3_ALLOW_NEW_SOURCES: | |
299 | if (gdeleted || !psf->sf_crcount) | |
300 | return 0; | |
301 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
302 | case IGMPV3_BLOCK_OLD_SOURCES: | |
303 | if (pmc->sfmode == MCAST_INCLUDE) | |
304 | return gdeleted || (psf->sf_crcount && sdeleted); | |
305 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
306 | } | |
307 | return 0; | |
308 | } | |
309 | ||
310 | static int | |
311 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
312 | { | |
313 | struct ip_sf_list *psf; | |
314 | int scount = 0; | |
315 | ||
c71151f0 | 316 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
317 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
318 | continue; | |
319 | scount++; | |
320 | } | |
321 | return scount; | |
322 | } | |
323 | ||
4c672e4b | 324 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
1da177e4 LT |
325 | { |
326 | struct sk_buff *skb; | |
327 | struct rtable *rt; | |
328 | struct iphdr *pip; | |
329 | struct igmpv3_report *pig; | |
877acedc | 330 | struct net *net = dev_net(dev); |
31e4543d | 331 | struct flowi4 fl4; |
66088243 HX |
332 | int hlen = LL_RESERVED_SPACE(dev); |
333 | int tlen = dev->needed_tailroom; | |
4c672e4b | 334 | unsigned int size = mtu; |
1da177e4 | 335 | |
57e1ab6e | 336 | while (1) { |
66088243 | 337 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
338 | GFP_ATOMIC | __GFP_NOWARN); |
339 | if (skb) | |
340 | break; | |
341 | size >>= 1; | |
342 | if (size < 256) | |
343 | return NULL; | |
344 | } | |
9d4a0314 | 345 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 346 | |
31e4543d | 347 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
348 | 0, 0, |
349 | IPPROTO_IGMP, 0, dev->ifindex); | |
350 | if (IS_ERR(rt)) { | |
351 | kfree_skb(skb); | |
352 | return NULL; | |
1da177e4 | 353 | } |
1da177e4 | 354 | |
d8d1f30b | 355 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
356 | skb->dev = dev; |
357 | ||
66088243 | 358 | skb_reserve(skb, hlen); |
1837b2e2 | 359 | skb_tailroom_reserve(skb, mtu, tlen); |
1da177e4 | 360 | |
7e28ecc2 | 361 | skb_reset_network_header(skb); |
eddc9ec5 | 362 | pip = ip_hdr(skb); |
7e28ecc2 | 363 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
364 | |
365 | pip->version = 4; | |
366 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
367 | pip->tos = 0xc0; | |
368 | pip->frag_off = htons(IP_DF); | |
369 | pip->ttl = 1; | |
492f64ce DM |
370 | pip->daddr = fl4.daddr; |
371 | pip->saddr = fl4.saddr; | |
1da177e4 LT |
372 | pip->protocol = IPPROTO_IGMP; |
373 | pip->tot_len = 0; /* filled in later */ | |
b6a7719a | 374 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
375 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
376 | ((u8 *)&pip[1])[1] = 4; | |
377 | ((u8 *)&pip[1])[2] = 0; | |
378 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 379 | |
b0e380b1 | 380 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 381 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 382 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
383 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
384 | pig->resv1 = 0; | |
385 | pig->csum = 0; | |
386 | pig->resv2 = 0; | |
387 | pig->ngrec = 0; | |
388 | return skb; | |
389 | } | |
390 | ||
391 | static int igmpv3_sendpack(struct sk_buff *skb) | |
392 | { | |
d9edf9e2 | 393 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 394 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 395 | |
d9edf9e2 | 396 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 397 | |
33224b16 | 398 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
1da177e4 LT |
399 | } |
400 | ||
401 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
402 | { | |
a7e9ff73 | 403 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
404 | } |
405 | ||
406 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
407 | int type, struct igmpv3_grec **ppgr) | |
408 | { | |
409 | struct net_device *dev = pmc->interface->dev; | |
410 | struct igmpv3_report *pih; | |
411 | struct igmpv3_grec *pgr; | |
412 | ||
413 | if (!skb) | |
414 | skb = igmpv3_newpack(dev, dev->mtu); | |
415 | if (!skb) | |
416 | return NULL; | |
417 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
418 | pgr->grec_type = type; | |
419 | pgr->grec_auxwords = 0; | |
420 | pgr->grec_nsrcs = 0; | |
421 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 422 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
423 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
424 | *ppgr = pgr; | |
425 | return skb; | |
426 | } | |
427 | ||
4c672e4b | 428 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
429 | |
430 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
431 | int type, int gdeleted, int sdeleted) | |
432 | { | |
433 | struct net_device *dev = pmc->interface->dev; | |
87a8a2ae | 434 | struct net *net = dev_net(dev); |
1da177e4 LT |
435 | struct igmpv3_report *pih; |
436 | struct igmpv3_grec *pgr = NULL; | |
437 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 438 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
439 | |
440 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
441 | return skb; | |
87a8a2ae | 442 | if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 443 | return skb; |
1da177e4 LT |
444 | |
445 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
446 | type == IGMPV3_MODE_IS_EXCLUDE; | |
447 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
448 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
449 | ||
ad12583f DS |
450 | stotal = scount = 0; |
451 | ||
1da177e4 LT |
452 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
453 | ||
ad12583f DS |
454 | if (!*psf_list) |
455 | goto empty_source; | |
456 | ||
d9edf9e2 | 457 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
458 | |
459 | /* EX and TO_EX get a fresh packet, if needed */ | |
460 | if (truncate) { | |
461 | if (pih && pih->ngrec && | |
462 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
463 | if (skb) | |
464 | igmpv3_sendpack(skb); | |
465 | skb = igmpv3_newpack(dev, dev->mtu); | |
466 | } | |
467 | } | |
468 | first = 1; | |
1da177e4 | 469 | psf_prev = NULL; |
c71151f0 | 470 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 471 | __be32 *psrc; |
1da177e4 LT |
472 | |
473 | psf_next = psf->sf_next; | |
474 | ||
475 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
476 | psf_prev = psf; | |
477 | continue; | |
478 | } | |
479 | ||
a052517a HL |
480 | /* Based on RFC3376 5.1. Should not send source-list change |
481 | * records when there is a filter mode change. | |
482 | */ | |
483 | if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || | |
484 | (!gdeleted && pmc->crcount)) && | |
485 | (type == IGMPV3_ALLOW_NEW_SOURCES || | |
486 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) | |
487 | goto decrease_sf_crcount; | |
488 | ||
1da177e4 LT |
489 | /* clear marks on query responses */ |
490 | if (isquery) | |
491 | psf->sf_gsresp = 0; | |
492 | ||
63007727 | 493 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
494 | first*sizeof(struct igmpv3_grec)) { |
495 | if (truncate && !first) | |
496 | break; /* truncate these */ | |
497 | if (pgr) | |
498 | pgr->grec_nsrcs = htons(scount); | |
499 | if (skb) | |
500 | igmpv3_sendpack(skb); | |
501 | skb = igmpv3_newpack(dev, dev->mtu); | |
502 | first = 1; | |
503 | scount = 0; | |
504 | } | |
505 | if (first) { | |
506 | skb = add_grhead(skb, pmc, type, &pgr); | |
507 | first = 0; | |
508 | } | |
cc63f70b AD |
509 | if (!skb) |
510 | return NULL; | |
63007727 | 511 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 512 | *psrc = psf->sf_inaddr; |
ad12583f | 513 | scount++; stotal++; |
1da177e4 LT |
514 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
515 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
a052517a | 516 | decrease_sf_crcount: |
1da177e4 LT |
517 | psf->sf_crcount--; |
518 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
519 | if (psf_prev) | |
520 | psf_prev->sf_next = psf->sf_next; | |
521 | else | |
522 | *psf_list = psf->sf_next; | |
523 | kfree(psf); | |
524 | continue; | |
525 | } | |
526 | } | |
527 | psf_prev = psf; | |
528 | } | |
ad12583f DS |
529 | |
530 | empty_source: | |
531 | if (!stotal) { | |
532 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
533 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
534 | return skb; | |
535 | if (pmc->crcount || isquery) { | |
536 | /* make sure we have room for group header */ | |
c71151f0 | 537 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
538 | igmpv3_sendpack(skb); |
539 | skb = NULL; /* add_grhead will get a new one */ | |
540 | } | |
541 | skb = add_grhead(skb, pmc, type, &pgr); | |
542 | } | |
543 | } | |
1da177e4 LT |
544 | if (pgr) |
545 | pgr->grec_nsrcs = htons(scount); | |
546 | ||
547 | if (isquery) | |
548 | pmc->gsquery = 0; /* clear query state on report */ | |
549 | return skb; | |
550 | } | |
551 | ||
552 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
553 | { | |
554 | struct sk_buff *skb = NULL; | |
87a8a2ae | 555 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
556 | int type; |
557 | ||
558 | if (!pmc) { | |
1d7138de ED |
559 | rcu_read_lock(); |
560 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
561 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
562 | continue; | |
df2cf4a7 | 563 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
87a8a2ae | 564 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 565 | continue; |
1da177e4 LT |
566 | spin_lock_bh(&pmc->lock); |
567 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
568 | type = IGMPV3_MODE_IS_EXCLUDE; | |
569 | else | |
570 | type = IGMPV3_MODE_IS_INCLUDE; | |
571 | skb = add_grec(skb, pmc, type, 0, 0); | |
572 | spin_unlock_bh(&pmc->lock); | |
573 | } | |
1d7138de | 574 | rcu_read_unlock(); |
1da177e4 LT |
575 | } else { |
576 | spin_lock_bh(&pmc->lock); | |
577 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
578 | type = IGMPV3_MODE_IS_EXCLUDE; | |
579 | else | |
580 | type = IGMPV3_MODE_IS_INCLUDE; | |
581 | skb = add_grec(skb, pmc, type, 0, 0); | |
582 | spin_unlock_bh(&pmc->lock); | |
583 | } | |
584 | if (!skb) | |
585 | return 0; | |
586 | return igmpv3_sendpack(skb); | |
587 | } | |
588 | ||
589 | /* | |
590 | * remove zero-count source records from a source filter list | |
591 | */ | |
592 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
593 | { | |
594 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
595 | ||
596 | psf_prev = NULL; | |
c71151f0 | 597 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
598 | psf_next = psf->sf_next; |
599 | if (psf->sf_crcount == 0) { | |
600 | if (psf_prev) | |
601 | psf_prev->sf_next = psf->sf_next; | |
602 | else | |
603 | *ppsf = psf->sf_next; | |
604 | kfree(psf); | |
605 | } else | |
606 | psf_prev = psf; | |
607 | } | |
608 | } | |
609 | ||
610 | static void igmpv3_send_cr(struct in_device *in_dev) | |
611 | { | |
612 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
613 | struct sk_buff *skb = NULL; | |
614 | int type, dtype; | |
615 | ||
1d7138de | 616 | rcu_read_lock(); |
1da177e4 LT |
617 | spin_lock_bh(&in_dev->mc_tomb_lock); |
618 | ||
619 | /* deleted MCA's */ | |
620 | pmc_prev = NULL; | |
c71151f0 | 621 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
622 | pmc_next = pmc->next; |
623 | if (pmc->sfmode == MCAST_INCLUDE) { | |
624 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
625 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
626 | skb = add_grec(skb, pmc, type, 1, 0); | |
627 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
628 | } | |
629 | if (pmc->crcount) { | |
1da177e4 LT |
630 | if (pmc->sfmode == MCAST_EXCLUDE) { |
631 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
632 | skb = add_grec(skb, pmc, type, 1, 0); | |
633 | } | |
ad12583f | 634 | pmc->crcount--; |
1da177e4 LT |
635 | if (pmc->crcount == 0) { |
636 | igmpv3_clear_zeros(&pmc->tomb); | |
637 | igmpv3_clear_zeros(&pmc->sources); | |
638 | } | |
639 | } | |
640 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
641 | if (pmc_prev) | |
642 | pmc_prev->next = pmc_next; | |
643 | else | |
644 | in_dev->mc_tomb = pmc_next; | |
645 | in_dev_put(pmc->interface); | |
646 | kfree(pmc); | |
647 | } else | |
648 | pmc_prev = pmc; | |
649 | } | |
650 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
651 | ||
652 | /* change recs */ | |
1d7138de | 653 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
654 | spin_lock_bh(&pmc->lock); |
655 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
656 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
657 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
658 | } else { | |
659 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
660 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
661 | } | |
662 | skb = add_grec(skb, pmc, type, 0, 0); | |
663 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
664 | ||
665 | /* filter mode changes */ | |
666 | if (pmc->crcount) { | |
1da177e4 LT |
667 | if (pmc->sfmode == MCAST_EXCLUDE) |
668 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
669 | else | |
670 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
671 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 672 | pmc->crcount--; |
1da177e4 LT |
673 | } |
674 | spin_unlock_bh(&pmc->lock); | |
675 | } | |
1d7138de | 676 | rcu_read_unlock(); |
1da177e4 LT |
677 | |
678 | if (!skb) | |
679 | return; | |
680 | (void) igmpv3_sendpack(skb); | |
681 | } | |
682 | ||
683 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
684 | int type) | |
685 | { | |
686 | struct sk_buff *skb; | |
687 | struct iphdr *iph; | |
688 | struct igmphdr *ih; | |
689 | struct rtable *rt; | |
690 | struct net_device *dev = in_dev->dev; | |
877acedc | 691 | struct net *net = dev_net(dev); |
63007727 | 692 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 693 | struct flowi4 fl4; |
63007727 | 694 | __be32 dst; |
66088243 | 695 | int hlen, tlen; |
1da177e4 LT |
696 | |
697 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
698 | return igmpv3_send_report(in_dev, pmc); | |
df2cf4a7 | 699 | |
87a8a2ae | 700 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 PD |
701 | return 0; |
702 | ||
703 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
1da177e4 LT |
704 | dst = IGMP_ALL_ROUTER; |
705 | else | |
706 | dst = group; | |
707 | ||
31e4543d | 708 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
709 | 0, 0, |
710 | IPPROTO_IGMP, 0, dev->ifindex); | |
711 | if (IS_ERR(rt)) | |
712 | return -1; | |
713 | ||
66088243 HX |
714 | hlen = LL_RESERVED_SPACE(dev); |
715 | tlen = dev->needed_tailroom; | |
716 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
51456b29 | 717 | if (!skb) { |
1da177e4 LT |
718 | ip_rt_put(rt); |
719 | return -1; | |
720 | } | |
9d4a0314 | 721 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 722 | |
d8d1f30b | 723 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 724 | |
66088243 | 725 | skb_reserve(skb, hlen); |
1da177e4 | 726 | |
7e28ecc2 | 727 | skb_reset_network_header(skb); |
eddc9ec5 | 728 | iph = ip_hdr(skb); |
7e28ecc2 | 729 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
730 | |
731 | iph->version = 4; | |
732 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
733 | iph->tos = 0xc0; | |
734 | iph->frag_off = htons(IP_DF); | |
735 | iph->ttl = 1; | |
736 | iph->daddr = dst; | |
492f64ce | 737 | iph->saddr = fl4.saddr; |
1da177e4 | 738 | iph->protocol = IPPROTO_IGMP; |
b6a7719a | 739 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
740 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
741 | ((u8 *)&iph[1])[1] = 4; | |
742 | ((u8 *)&iph[1])[2] = 0; | |
743 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 LT |
744 | |
745 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
746 | ih->type = type; |
747 | ih->code = 0; | |
748 | ih->csum = 0; | |
749 | ih->group = group; | |
750 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 751 | |
33224b16 | 752 | return ip_local_out(net, skb->sk, skb); |
1da177e4 LT |
753 | } |
754 | ||
755 | static void igmp_gq_timer_expire(unsigned long data) | |
756 | { | |
757 | struct in_device *in_dev = (struct in_device *)data; | |
758 | ||
759 | in_dev->mr_gq_running = 0; | |
760 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 761 | in_dev_put(in_dev); |
1da177e4 LT |
762 | } |
763 | ||
764 | static void igmp_ifc_timer_expire(unsigned long data) | |
765 | { | |
766 | struct in_device *in_dev = (struct in_device *)data; | |
767 | ||
768 | igmpv3_send_cr(in_dev); | |
769 | if (in_dev->mr_ifc_count) { | |
770 | in_dev->mr_ifc_count--; | |
cab70040 WM |
771 | igmp_ifc_start_timer(in_dev, |
772 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 773 | } |
e2401654 | 774 | in_dev_put(in_dev); |
1da177e4 LT |
775 | } |
776 | ||
777 | static void igmp_ifc_event(struct in_device *in_dev) | |
778 | { | |
165094af | 779 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
780 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
781 | return; | |
165094af | 782 | in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
783 | igmp_ifc_start_timer(in_dev, 1); |
784 | } | |
785 | ||
786 | ||
787 | static void igmp_timer_expire(unsigned long data) | |
788 | { | |
c71151f0 | 789 | struct ip_mc_list *im = (struct ip_mc_list *)data; |
1da177e4 LT |
790 | struct in_device *in_dev = im->interface; |
791 | ||
792 | spin_lock(&im->lock); | |
a7e9ff73 | 793 | im->tm_running = 0; |
1da177e4 LT |
794 | |
795 | if (im->unsolicit_count) { | |
796 | im->unsolicit_count--; | |
cab70040 | 797 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
1da177e4 LT |
798 | } |
799 | im->reporter = 1; | |
800 | spin_unlock(&im->lock); | |
801 | ||
802 | if (IGMP_V1_SEEN(in_dev)) | |
803 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
804 | else if (IGMP_V2_SEEN(in_dev)) | |
805 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
806 | else | |
807 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
808 | ||
809 | ip_ma_put(im); | |
810 | } | |
811 | ||
ad12583f | 812 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 813 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
814 | { |
815 | struct ip_sf_list *psf; | |
816 | int i, scount; | |
817 | ||
ad12583f | 818 | scount = 0; |
c71151f0 | 819 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
820 | if (scount == nsrcs) |
821 | break; | |
c71151f0 | 822 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 823 | /* skip inactive filters */ |
e05c4ad3 | 824 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
825 | pmc->sfcount[MCAST_EXCLUDE] != |
826 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 827 | break; |
ad12583f DS |
828 | if (srcs[i] == psf->sf_inaddr) { |
829 | scount++; | |
830 | break; | |
831 | } | |
832 | } | |
833 | } | |
834 | pmc->gsquery = 0; | |
835 | if (scount == nsrcs) /* all sources excluded */ | |
836 | return 0; | |
837 | return 1; | |
838 | } | |
839 | ||
ea4d9e72 | 840 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
841 | { |
842 | struct ip_sf_list *psf; | |
843 | int i, scount; | |
844 | ||
845 | if (pmc->sfmode == MCAST_EXCLUDE) | |
846 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
847 | ||
848 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 849 | scount = 0; |
c71151f0 | 850 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
851 | if (scount == nsrcs) |
852 | break; | |
c71151f0 | 853 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
854 | if (srcs[i] == psf->sf_inaddr) { |
855 | psf->sf_gsresp = 1; | |
856 | scount++; | |
857 | break; | |
858 | } | |
859 | } | |
ad12583f DS |
860 | if (!scount) { |
861 | pmc->gsquery = 0; | |
862 | return 0; | |
863 | } | |
864 | pmc->gsquery = 1; | |
865 | return 1; | |
1da177e4 LT |
866 | } |
867 | ||
d679c532 ED |
868 | /* return true if packet was dropped */ |
869 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
870 | { |
871 | struct ip_mc_list *im; | |
87a8a2ae | 872 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
873 | |
874 | /* Timers are only set for non-local groups */ | |
875 | ||
876 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 877 | return false; |
87a8a2ae | 878 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 879 | return false; |
1da177e4 | 880 | |
1d7138de ED |
881 | rcu_read_lock(); |
882 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
883 | if (im->multiaddr == group) { |
884 | igmp_stop_timer(im); | |
885 | break; | |
886 | } | |
887 | } | |
1d7138de | 888 | rcu_read_unlock(); |
d679c532 | 889 | return false; |
1da177e4 LT |
890 | } |
891 | ||
d679c532 ED |
892 | /* return true if packet was dropped */ |
893 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
894 | int len) |
895 | { | |
d9edf9e2 ACM |
896 | struct igmphdr *ih = igmp_hdr(skb); |
897 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 898 | struct ip_mc_list *im; |
63007727 | 899 | __be32 group = ih->group; |
1da177e4 LT |
900 | int max_delay; |
901 | int mark = 0; | |
87a8a2ae | 902 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
903 | |
904 | ||
5b7c8406 | 905 | if (len == 8) { |
1da177e4 LT |
906 | if (ih->code == 0) { |
907 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 908 | |
436f7c20 | 909 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
1da177e4 | 910 | in_dev->mr_v1_seen = jiffies + |
436f7c20 | 911 | IGMP_V1_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
912 | group = 0; |
913 | } else { | |
914 | /* v2 router present */ | |
915 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
916 | in_dev->mr_v2_seen = jiffies + | |
436f7c20 | 917 | IGMP_V2_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
918 | } |
919 | /* cancel the interface change timer */ | |
920 | in_dev->mr_ifc_count = 0; | |
921 | if (del_timer(&in_dev->mr_ifc_timer)) | |
922 | __in_dev_put(in_dev); | |
923 | /* clear deleted report items */ | |
924 | igmpv3_clear_delrec(in_dev); | |
925 | } else if (len < 12) { | |
d679c532 | 926 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
927 | } else if (IGMP_V1_SEEN(in_dev)) { |
928 | /* This is a v3 query with v1 queriers present */ | |
436f7c20 | 929 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
5b7c8406 DS |
930 | group = 0; |
931 | } else if (IGMP_V2_SEEN(in_dev)) { | |
932 | /* this is a v3 query with v2 queriers present; | |
933 | * Interpretation of the max_delay code is problematic here. | |
934 | * A real v2 host would use ih_code directly, while v3 has a | |
935 | * different encoding. We use the v3 encoding as more likely | |
936 | * to be intended in a v3 query. | |
937 | */ | |
938 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
939 | if (!max_delay) |
940 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
941 | } else { /* v3 */ |
942 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 943 | return true; |
e905a9ed | 944 | |
d9edf9e2 | 945 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 946 | if (ih3->nsrcs) { |
e905a9ed | 947 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 948 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 949 | return true; |
d9edf9e2 | 950 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
951 | } |
952 | ||
953 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
954 | if (!max_delay) | |
955 | max_delay = 1; /* can't mod w/ 0 */ | |
956 | in_dev->mr_maxdelay = max_delay; | |
957 | if (ih3->qrv) | |
958 | in_dev->mr_qrv = ih3->qrv; | |
959 | if (!group) { /* general query */ | |
960 | if (ih3->nsrcs) | |
b47bd8d2 | 961 | return true; /* no sources allowed */ |
1da177e4 | 962 | igmp_gq_start_timer(in_dev); |
d679c532 | 963 | return false; |
1da177e4 LT |
964 | } |
965 | /* mark sources to include, if group & source-specific */ | |
966 | mark = ih3->nsrcs != 0; | |
967 | } | |
968 | ||
969 | /* | |
970 | * - Start the timers in all of our membership records | |
971 | * that the query applies to for the interface on | |
972 | * which the query arrived excl. those that belong | |
973 | * to a "local" group (224.0.0.X) | |
974 | * - For timers already running check if they need to | |
975 | * be reset. | |
976 | * - Use the igmp->igmp_code field as the maximum | |
977 | * delay possible | |
978 | */ | |
1d7138de ED |
979 | rcu_read_lock(); |
980 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
981 | int changed; |
982 | ||
1da177e4 LT |
983 | if (group && group != im->multiaddr) |
984 | continue; | |
985 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
986 | continue; | |
df2cf4a7 | 987 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 988 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 989 | continue; |
1da177e4 LT |
990 | spin_lock_bh(&im->lock); |
991 | if (im->tm_running) | |
992 | im->gsquery = im->gsquery && mark; | |
993 | else | |
994 | im->gsquery = mark; | |
ad12583f | 995 | changed = !im->gsquery || |
e905a9ed | 996 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 997 | spin_unlock_bh(&im->lock); |
ad12583f DS |
998 | if (changed) |
999 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 1000 | } |
1d7138de | 1001 | rcu_read_unlock(); |
d679c532 | 1002 | return false; |
1da177e4 LT |
1003 | } |
1004 | ||
9a57a9d2 | 1005 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
1006 | int igmp_rcv(struct sk_buff *skb) |
1007 | { | |
1008 | /* This basically follows the spec line by line -- see RFC1112 */ | |
1009 | struct igmphdr *ih; | |
9a57a9d2 | 1010 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 | 1011 | int len = skb->len; |
d679c532 | 1012 | bool dropped = true; |
1da177e4 | 1013 | |
51456b29 | 1014 | if (!in_dev) |
cd557bc1 | 1015 | goto drop; |
1da177e4 | 1016 | |
fb286bb2 | 1017 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 1018 | goto drop; |
fb286bb2 | 1019 | |
de08dc1a TH |
1020 | if (skb_checksum_simple_validate(skb)) |
1021 | goto drop; | |
1da177e4 | 1022 | |
d9edf9e2 | 1023 | ih = igmp_hdr(skb); |
1da177e4 LT |
1024 | switch (ih->type) { |
1025 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 1026 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
1027 | break; |
1028 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1029 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 1030 | /* Is it our report looped back? */ |
c7537967 | 1031 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1032 | break; |
24c69275 DS |
1033 | /* don't rely on MC router hearing unicast reports */ |
1034 | if (skb->pkt_type == PACKET_MULTICAST || | |
1035 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1036 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1037 | break; |
1038 | case IGMP_PIM: | |
1039 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1040 | return pim_rcv_v1(skb); |
1041 | #endif | |
c6b471e6 | 1042 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1043 | case IGMP_DVMRP: |
1044 | case IGMP_TRACE: | |
1045 | case IGMP_HOST_LEAVE_MESSAGE: | |
1046 | case IGMP_MTRACE: | |
1047 | case IGMP_MTRACE_RESP: | |
1048 | break; | |
1049 | default: | |
dd1c1853 | 1050 | break; |
1da177e4 | 1051 | } |
fb286bb2 | 1052 | |
cd557bc1 | 1053 | drop: |
d679c532 ED |
1054 | if (dropped) |
1055 | kfree_skb(skb); | |
1056 | else | |
1057 | consume_skb(skb); | |
1da177e4 LT |
1058 | return 0; |
1059 | } | |
1060 | ||
1061 | #endif | |
1062 | ||
1063 | ||
1064 | /* | |
1065 | * Add a filter to a device | |
1066 | */ | |
1067 | ||
63007727 | 1068 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1069 | { |
1070 | char buf[MAX_ADDR_LEN]; | |
1071 | struct net_device *dev = in_dev->dev; | |
1072 | ||
1073 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1074 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1075 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1076 | routine. Something sort of: |
1077 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1078 | --ANK | |
1079 | */ | |
1080 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1081 | dev_mc_add(dev, buf); |
1da177e4 LT |
1082 | } |
1083 | ||
1084 | /* | |
1085 | * Remove a filter from a device | |
1086 | */ | |
1087 | ||
63007727 | 1088 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1089 | { |
1090 | char buf[MAX_ADDR_LEN]; | |
1091 | struct net_device *dev = in_dev->dev; | |
1092 | ||
1093 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1094 | dev_mc_del(dev, buf); |
1da177e4 LT |
1095 | } |
1096 | ||
1097 | #ifdef CONFIG_IP_MULTICAST | |
1098 | /* | |
1099 | * deleted ip_mc_list manipulation | |
1100 | */ | |
1101 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1102 | { | |
1103 | struct ip_mc_list *pmc; | |
165094af | 1104 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1105 | |
1106 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1107 | * are actually used. In particular, the refcnt and users are not | |
1108 | * used for management of the delete list. Using the same structure | |
1109 | * for deleted items allows change reports to use common code with | |
1110 | * non-deleted or query-response MCA's. | |
1111 | */ | |
0da974f4 | 1112 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1113 | if (!pmc) |
1114 | return; | |
1da177e4 LT |
1115 | spin_lock_bh(&im->lock); |
1116 | pmc->interface = im->interface; | |
1117 | in_dev_hold(in_dev); | |
1118 | pmc->multiaddr = im->multiaddr; | |
165094af | 1119 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1120 | pmc->sfmode = im->sfmode; |
1121 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1122 | struct ip_sf_list *psf; | |
1123 | ||
1124 | pmc->tomb = im->tomb; | |
1125 | pmc->sources = im->sources; | |
1126 | im->tomb = im->sources = NULL; | |
c71151f0 | 1127 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1128 | psf->sf_crcount = pmc->crcount; |
1129 | } | |
1130 | spin_unlock_bh(&im->lock); | |
1131 | ||
1132 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1133 | pmc->next = in_dev->mc_tomb; | |
1134 | in_dev->mc_tomb = pmc; | |
1135 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1136 | } | |
1137 | ||
24803f38 HL |
1138 | /* |
1139 | * restore ip_mc_list deleted records | |
1140 | */ | |
1141 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1da177e4 LT |
1142 | { |
1143 | struct ip_mc_list *pmc, *pmc_prev; | |
24803f38 HL |
1144 | struct ip_sf_list *psf; |
1145 | struct net *net = dev_net(in_dev->dev); | |
1146 | __be32 multiaddr = im->multiaddr; | |
1da177e4 LT |
1147 | |
1148 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1149 | pmc_prev = NULL; | |
c71151f0 | 1150 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1151 | if (pmc->multiaddr == multiaddr) |
1152 | break; | |
1153 | pmc_prev = pmc; | |
1154 | } | |
1155 | if (pmc) { | |
1156 | if (pmc_prev) | |
1157 | pmc_prev->next = pmc->next; | |
1158 | else | |
1159 | in_dev->mc_tomb = pmc->next; | |
1160 | } | |
1161 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
24803f38 HL |
1162 | |
1163 | spin_lock_bh(&im->lock); | |
1da177e4 | 1164 | if (pmc) { |
24803f38 HL |
1165 | im->interface = pmc->interface; |
1166 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1167 | im->sfmode = pmc->sfmode; | |
1168 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1169 | im->tomb = pmc->tomb; | |
1170 | im->sources = pmc->sources; | |
1171 | for (psf = im->sources; psf; psf = psf->sf_next) | |
1172 | psf->sf_crcount = im->crcount; | |
1da177e4 LT |
1173 | } |
1174 | in_dev_put(pmc->interface); | |
1da177e4 | 1175 | } |
24803f38 | 1176 | spin_unlock_bh(&im->lock); |
1da177e4 LT |
1177 | } |
1178 | ||
24803f38 HL |
1179 | /* |
1180 | * flush ip_mc_list deleted records | |
1181 | */ | |
1da177e4 LT |
1182 | static void igmpv3_clear_delrec(struct in_device *in_dev) |
1183 | { | |
1184 | struct ip_mc_list *pmc, *nextpmc; | |
1185 | ||
1186 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1187 | pmc = in_dev->mc_tomb; | |
1188 | in_dev->mc_tomb = NULL; | |
1189 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1190 | ||
1191 | for (; pmc; pmc = nextpmc) { | |
1192 | nextpmc = pmc->next; | |
1193 | ip_mc_clear_src(pmc); | |
1194 | in_dev_put(pmc->interface); | |
1195 | kfree(pmc); | |
1196 | } | |
1197 | /* clear dead sources, too */ | |
1d7138de ED |
1198 | rcu_read_lock(); |
1199 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1200 | struct ip_sf_list *psf, *psf_next; |
1201 | ||
1202 | spin_lock_bh(&pmc->lock); | |
1203 | psf = pmc->tomb; | |
1204 | pmc->tomb = NULL; | |
1205 | spin_unlock_bh(&pmc->lock); | |
c71151f0 | 1206 | for (; psf; psf = psf_next) { |
1da177e4 LT |
1207 | psf_next = psf->sf_next; |
1208 | kfree(psf); | |
1209 | } | |
1210 | } | |
1d7138de | 1211 | rcu_read_unlock(); |
1da177e4 LT |
1212 | } |
1213 | #endif | |
1214 | ||
1215 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1216 | { | |
1217 | struct in_device *in_dev = im->interface; | |
1218 | #ifdef CONFIG_IP_MULTICAST | |
87a8a2ae | 1219 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1220 | int reporter; |
1221 | #endif | |
1222 | ||
1223 | if (im->loaded) { | |
1224 | im->loaded = 0; | |
1225 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1226 | } | |
1227 | ||
1228 | #ifdef CONFIG_IP_MULTICAST | |
1229 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1230 | return; | |
87a8a2ae | 1231 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1232 | return; |
1da177e4 LT |
1233 | |
1234 | reporter = im->reporter; | |
1235 | igmp_stop_timer(im); | |
1236 | ||
1237 | if (!in_dev->dead) { | |
1238 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1239 | return; |
1da177e4 LT |
1240 | if (IGMP_V2_SEEN(in_dev)) { |
1241 | if (reporter) | |
1242 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1243 | return; |
1da177e4 LT |
1244 | } |
1245 | /* IGMPv3 */ | |
1246 | igmpv3_add_delrec(in_dev, im); | |
1247 | ||
1248 | igmp_ifc_event(in_dev); | |
1249 | } | |
1da177e4 | 1250 | #endif |
1da177e4 LT |
1251 | } |
1252 | ||
1253 | static void igmp_group_added(struct ip_mc_list *im) | |
1254 | { | |
1255 | struct in_device *in_dev = im->interface; | |
dcd87999 | 1256 | #ifdef CONFIG_IP_MULTICAST |
87a8a2ae | 1257 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1258 | #endif |
1da177e4 LT |
1259 | |
1260 | if (im->loaded == 0) { | |
1261 | im->loaded = 1; | |
1262 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1263 | } | |
1264 | ||
1265 | #ifdef CONFIG_IP_MULTICAST | |
1266 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1267 | return; | |
87a8a2ae | 1268 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1269 | return; |
1da177e4 LT |
1270 | |
1271 | if (in_dev->dead) | |
1272 | return; | |
1273 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1274 | spin_lock_bh(&im->lock); | |
436f7c20 | 1275 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); |
1da177e4 LT |
1276 | spin_unlock_bh(&im->lock); |
1277 | return; | |
1278 | } | |
1279 | /* else, v3 */ | |
1280 | ||
165094af | 1281 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1282 | igmp_ifc_event(in_dev); |
1283 | #endif | |
1284 | } | |
1285 | ||
1286 | ||
1287 | /* | |
1288 | * Multicast list managers | |
1289 | */ | |
1290 | ||
e9897071 ED |
1291 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1292 | { | |
c70eba74 | 1293 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1294 | } |
1295 | ||
1296 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1297 | struct ip_mc_list *im) | |
1298 | { | |
1299 | struct ip_mc_list __rcu **mc_hash; | |
1300 | u32 hash; | |
1301 | ||
1302 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1303 | if (mc_hash) { | |
1304 | hash = ip_mc_hash(im); | |
c70eba74 | 1305 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1306 | rcu_assign_pointer(mc_hash[hash], im); |
1307 | return; | |
1308 | } | |
1309 | ||
1310 | /* do not use a hash table for small number of items */ | |
1311 | if (in_dev->mc_count < 4) | |
1312 | return; | |
1313 | ||
1314 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1315 | GFP_KERNEL); | |
1316 | if (!mc_hash) | |
1317 | return; | |
1318 | ||
1319 | for_each_pmc_rtnl(in_dev, im) { | |
1320 | hash = ip_mc_hash(im); | |
c70eba74 | 1321 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1322 | RCU_INIT_POINTER(mc_hash[hash], im); |
1323 | } | |
1324 | ||
1325 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1326 | } | |
1327 | ||
1328 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1329 | struct ip_mc_list *im) | |
1330 | { | |
1331 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1332 | struct ip_mc_list *aux; | |
1333 | ||
1334 | if (!mc_hash) | |
1335 | return; | |
1336 | mc_hash += ip_mc_hash(im); | |
1337 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1338 | mc_hash = &aux->next_hash; | |
1339 | *mc_hash = im->next_hash; | |
1340 | } | |
1341 | ||
1da177e4 LT |
1342 | |
1343 | /* | |
1344 | * A socket has joined a multicast group on device dev. | |
1345 | */ | |
1346 | ||
8f935bbd | 1347 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1348 | { |
1349 | struct ip_mc_list *im; | |
dcd87999 | 1350 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1351 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1352 | #endif |
1da177e4 LT |
1353 | |
1354 | ASSERT_RTNL(); | |
1355 | ||
1d7138de | 1356 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1357 | if (im->multiaddr == addr) { |
1358 | im->users++; | |
1359 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1360 | goto out; | |
1361 | } | |
1362 | } | |
1363 | ||
1d7138de | 1364 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1365 | if (!im) |
1366 | goto out; | |
1367 | ||
a7e9ff73 JK |
1368 | im->users = 1; |
1369 | im->interface = in_dev; | |
1da177e4 | 1370 | in_dev_hold(in_dev); |
a7e9ff73 | 1371 | im->multiaddr = addr; |
1da177e4 LT |
1372 | /* initial mode is (EX, empty) */ |
1373 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1374 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1375 | atomic_set(&im->refcnt, 1); |
1376 | spin_lock_init(&im->lock); | |
1377 | #ifdef CONFIG_IP_MULTICAST | |
179542a5 | 1378 | setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im); |
165094af | 1379 | im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1380 | #endif |
1d7138de ED |
1381 | |
1382 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1383 | in_dev->mc_count++; |
cf778b00 | 1384 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1385 | |
e9897071 ED |
1386 | ip_mc_hash_add(in_dev, im); |
1387 | ||
1da177e4 | 1388 | #ifdef CONFIG_IP_MULTICAST |
24803f38 | 1389 | igmpv3_del_delrec(in_dev, im); |
1da177e4 LT |
1390 | #endif |
1391 | igmp_group_added(im); | |
1392 | if (!in_dev->dead) | |
1393 | ip_rt_multicast_event(in_dev); | |
1394 | out: | |
1395 | return; | |
1396 | } | |
4bc2f18b | 1397 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1398 | |
9afd85c9 LL |
1399 | static int ip_mc_check_iphdr(struct sk_buff *skb) |
1400 | { | |
1401 | const struct iphdr *iph; | |
1402 | unsigned int len; | |
1403 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1404 | ||
1405 | if (!pskb_may_pull(skb, offset)) | |
1406 | return -EINVAL; | |
1407 | ||
1408 | iph = ip_hdr(skb); | |
1409 | ||
1410 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1411 | return -EINVAL; | |
1412 | ||
1413 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1414 | ||
1415 | if (!pskb_may_pull(skb, offset)) | |
1416 | return -EINVAL; | |
1417 | ||
1418 | iph = ip_hdr(skb); | |
1419 | ||
1420 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1421 | return -EINVAL; | |
1422 | ||
1423 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1424 | if (skb->len < len || len < offset) | |
1425 | return -EINVAL; | |
1426 | ||
1427 | skb_set_transport_header(skb, offset); | |
1428 | ||
1429 | return 0; | |
1430 | } | |
1431 | ||
1432 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1433 | { | |
1434 | unsigned int len = skb_transport_offset(skb); | |
1435 | ||
1436 | len += sizeof(struct igmpv3_report); | |
1437 | ||
1438 | return pskb_may_pull(skb, len) ? 0 : -EINVAL; | |
1439 | } | |
1440 | ||
1441 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1442 | { | |
1443 | unsigned int len = skb_transport_offset(skb); | |
1444 | ||
1445 | len += sizeof(struct igmphdr); | |
1446 | if (skb->len < len) | |
1447 | return -EINVAL; | |
1448 | ||
1449 | /* IGMPv{1,2}? */ | |
1450 | if (skb->len != len) { | |
1451 | /* or IGMPv3? */ | |
1452 | len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); | |
1453 | if (skb->len < len || !pskb_may_pull(skb, len)) | |
1454 | return -EINVAL; | |
1455 | } | |
1456 | ||
1457 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1458 | * all-systems destination addresses (224.0.0.1) for general queries | |
1459 | */ | |
1460 | if (!igmp_hdr(skb)->group && | |
1461 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1462 | return -EINVAL; | |
1463 | ||
1464 | return 0; | |
1465 | } | |
1466 | ||
1467 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1468 | { | |
1469 | switch (igmp_hdr(skb)->type) { | |
1470 | case IGMP_HOST_LEAVE_MESSAGE: | |
1471 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1472 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1473 | /* fall through */ | |
1474 | return 0; | |
1475 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1476 | return ip_mc_check_igmp_reportv3(skb); | |
1477 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1478 | return ip_mc_check_igmp_query(skb); | |
1479 | default: | |
1480 | return -ENOMSG; | |
1481 | } | |
1482 | } | |
1483 | ||
1484 | static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) | |
1485 | { | |
1486 | return skb_checksum_simple_validate(skb); | |
1487 | } | |
1488 | ||
1489 | static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1490 | ||
1491 | { | |
1492 | struct sk_buff *skb_chk; | |
1493 | unsigned int transport_len; | |
1494 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); | |
a516993f | 1495 | int ret = -EINVAL; |
9afd85c9 LL |
1496 | |
1497 | transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); | |
1498 | ||
9afd85c9 LL |
1499 | skb_chk = skb_checksum_trimmed(skb, transport_len, |
1500 | ip_mc_validate_checksum); | |
1501 | if (!skb_chk) | |
a516993f | 1502 | goto err; |
9afd85c9 | 1503 | |
a516993f LL |
1504 | if (!pskb_may_pull(skb_chk, len)) |
1505 | goto err; | |
9afd85c9 LL |
1506 | |
1507 | ret = ip_mc_check_igmp_msg(skb_chk); | |
a516993f LL |
1508 | if (ret) |
1509 | goto err; | |
9afd85c9 LL |
1510 | |
1511 | if (skb_trimmed) | |
1512 | *skb_trimmed = skb_chk; | |
a516993f LL |
1513 | /* free now unneeded clone */ |
1514 | else if (skb_chk != skb) | |
9afd85c9 LL |
1515 | kfree_skb(skb_chk); |
1516 | ||
a516993f LL |
1517 | ret = 0; |
1518 | ||
1519 | err: | |
1520 | if (ret && skb_chk && skb_chk != skb) | |
1521 | kfree_skb(skb_chk); | |
1522 | ||
1523 | return ret; | |
9afd85c9 LL |
1524 | } |
1525 | ||
1526 | /** | |
1527 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1528 | * @skb: the skb to validate | |
1529 | * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) | |
1530 | * | |
1531 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
a516993f | 1532 | * skb transport header accordingly and returns zero. |
9afd85c9 LL |
1533 | * |
1534 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1535 | * standard | |
1536 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1537 | * -ENOMEM: A memory allocation failure happened. | |
1538 | * | |
1539 | * Optionally, an skb pointer might be provided via skb_trimmed (or set it | |
1540 | * to NULL): After parsing an IGMP packet successfully it will point to | |
1541 | * an skb which has its tail aligned to the IP packet end. This might | |
1542 | * either be the originally provided skb or a trimmed, cloned version if | |
1543 | * the skb frame had data beyond the IP packet. A cloned skb allows us | |
1544 | * to leave the original skb and its full frame unchanged (which might be | |
1545 | * desirable for layer 2 frame jugglers). | |
1546 | * | |
a516993f LL |
1547 | * Caller needs to set the skb network header and free any returned skb if it |
1548 | * differs from the provided skb. | |
9afd85c9 LL |
1549 | */ |
1550 | int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1551 | { | |
1552 | int ret = ip_mc_check_iphdr(skb); | |
1553 | ||
1554 | if (ret < 0) | |
1555 | return ret; | |
1556 | ||
1557 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1558 | return -ENOMSG; | |
1559 | ||
1560 | return __ip_mc_check_igmp(skb, skb_trimmed); | |
1561 | } | |
1562 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1563 | ||
a816c7c7 | 1564 | /* |
4aa5dee4 | 1565 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1566 | */ |
4aa5dee4 | 1567 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1568 | { |
08882669 | 1569 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1570 | struct ip_mc_list *im; |
1571 | int type; | |
87a8a2ae | 1572 | struct net *net = dev_net(in_dev->dev); |
a816c7c7 | 1573 | |
4aa5dee4 JP |
1574 | ASSERT_RTNL(); |
1575 | ||
1576 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1577 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1578 | continue; | |
df2cf4a7 | 1579 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1580 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1581 | continue; |
a816c7c7 | 1582 | |
866f3b25 ED |
1583 | /* a failover is happening and switches |
1584 | * must be notified immediately | |
1585 | */ | |
1586 | if (IGMP_V1_SEEN(in_dev)) | |
1587 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1588 | else if (IGMP_V2_SEEN(in_dev)) | |
1589 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1590 | else | |
1591 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1592 | igmp_send_report(in_dev, im, type); | |
1593 | } | |
a816c7c7 JV |
1594 | #endif |
1595 | } | |
1596 | ||
1da177e4 LT |
1597 | /* |
1598 | * A socket has left a multicast group on device dev | |
1599 | */ | |
1600 | ||
8f935bbd | 1601 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1602 | { |
1d7138de ED |
1603 | struct ip_mc_list *i; |
1604 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1605 | |
1da177e4 | 1606 | ASSERT_RTNL(); |
e905a9ed | 1607 | |
1d7138de ED |
1608 | for (ip = &in_dev->mc_list; |
1609 | (i = rtnl_dereference(*ip)) != NULL; | |
1610 | ip = &i->next_rcu) { | |
a7e9ff73 | 1611 | if (i->multiaddr == addr) { |
1da177e4 | 1612 | if (--i->users == 0) { |
e9897071 | 1613 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1614 | *ip = i->next_rcu; |
b8bae41e | 1615 | in_dev->mc_count--; |
1da177e4 | 1616 | igmp_group_dropped(i); |
24cf3af3 | 1617 | ip_mc_clear_src(i); |
1da177e4 LT |
1618 | |
1619 | if (!in_dev->dead) | |
1620 | ip_rt_multicast_event(in_dev); | |
1621 | ||
1622 | ip_ma_put(i); | |
1623 | return; | |
1624 | } | |
1625 | break; | |
1626 | } | |
1627 | } | |
1628 | } | |
4bc2f18b | 1629 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1630 | |
75c78500 MS |
1631 | /* Device changing type */ |
1632 | ||
1633 | void ip_mc_unmap(struct in_device *in_dev) | |
1634 | { | |
1d7138de | 1635 | struct ip_mc_list *pmc; |
75c78500 MS |
1636 | |
1637 | ASSERT_RTNL(); | |
1638 | ||
1d7138de ED |
1639 | for_each_pmc_rtnl(in_dev, pmc) |
1640 | igmp_group_dropped(pmc); | |
75c78500 MS |
1641 | } |
1642 | ||
1643 | void ip_mc_remap(struct in_device *in_dev) | |
1644 | { | |
1d7138de | 1645 | struct ip_mc_list *pmc; |
75c78500 MS |
1646 | |
1647 | ASSERT_RTNL(); | |
1648 | ||
24803f38 HL |
1649 | for_each_pmc_rtnl(in_dev, pmc) { |
1650 | #ifdef CONFIG_IP_MULTICAST | |
1651 | igmpv3_del_delrec(in_dev, pmc); | |
1652 | #endif | |
1d7138de | 1653 | igmp_group_added(pmc); |
24803f38 | 1654 | } |
75c78500 MS |
1655 | } |
1656 | ||
1da177e4 LT |
1657 | /* Device going down */ |
1658 | ||
1659 | void ip_mc_down(struct in_device *in_dev) | |
1660 | { | |
1d7138de | 1661 | struct ip_mc_list *pmc; |
1da177e4 LT |
1662 | |
1663 | ASSERT_RTNL(); | |
1664 | ||
1d7138de ED |
1665 | for_each_pmc_rtnl(in_dev, pmc) |
1666 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1667 | |
1668 | #ifdef CONFIG_IP_MULTICAST | |
1669 | in_dev->mr_ifc_count = 0; | |
1670 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1671 | __in_dev_put(in_dev); | |
1672 | in_dev->mr_gq_running = 0; | |
1673 | if (del_timer(&in_dev->mr_gq_timer)) | |
1674 | __in_dev_put(in_dev); | |
1da177e4 LT |
1675 | #endif |
1676 | ||
1677 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1678 | } | |
1679 | ||
1680 | void ip_mc_init_dev(struct in_device *in_dev) | |
1681 | { | |
dcd87999 | 1682 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1683 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1684 | #endif |
1da177e4 LT |
1685 | ASSERT_RTNL(); |
1686 | ||
1da177e4 | 1687 | #ifdef CONFIG_IP_MULTICAST |
b24b8a24 PE |
1688 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1689 | (unsigned long)in_dev); | |
b24b8a24 PE |
1690 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1691 | (unsigned long)in_dev); | |
165094af | 1692 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1693 | #endif |
1694 | ||
1da177e4 LT |
1695 | spin_lock_init(&in_dev->mc_tomb_lock); |
1696 | } | |
1697 | ||
1698 | /* Device going up */ | |
1699 | ||
1700 | void ip_mc_up(struct in_device *in_dev) | |
1701 | { | |
1d7138de | 1702 | struct ip_mc_list *pmc; |
dcd87999 | 1703 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1704 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1705 | #endif |
1da177e4 LT |
1706 | |
1707 | ASSERT_RTNL(); | |
1708 | ||
a9fe8e29 | 1709 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1710 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; |
a9fe8e29 | 1711 | #endif |
1da177e4 LT |
1712 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1713 | ||
24803f38 HL |
1714 | for_each_pmc_rtnl(in_dev, pmc) { |
1715 | #ifdef CONFIG_IP_MULTICAST | |
1716 | igmpv3_del_delrec(in_dev, pmc); | |
1717 | #endif | |
1d7138de | 1718 | igmp_group_added(pmc); |
24803f38 | 1719 | } |
1da177e4 LT |
1720 | } |
1721 | ||
1722 | /* | |
1723 | * Device is about to be destroyed: clean up. | |
1724 | */ | |
1725 | ||
1726 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1727 | { | |
1728 | struct ip_mc_list *i; | |
1729 | ||
1730 | ASSERT_RTNL(); | |
1731 | ||
1732 | /* Deactivate timers */ | |
1733 | ip_mc_down(in_dev); | |
24803f38 HL |
1734 | #ifdef CONFIG_IP_MULTICAST |
1735 | igmpv3_clear_delrec(in_dev); | |
1736 | #endif | |
1da177e4 | 1737 | |
1d7138de ED |
1738 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1739 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1740 | in_dev->mc_count--; |
1da177e4 | 1741 | ip_ma_put(i); |
1da177e4 | 1742 | } |
1da177e4 LT |
1743 | } |
1744 | ||
9e917dca | 1745 | /* RTNL is locked */ |
877acedc | 1746 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1747 | { |
1da177e4 LT |
1748 | struct net_device *dev = NULL; |
1749 | struct in_device *idev = NULL; | |
1750 | ||
1751 | if (imr->imr_ifindex) { | |
877acedc | 1752 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1753 | return idev; |
1754 | } | |
1755 | if (imr->imr_address.s_addr) { | |
9e917dca | 1756 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1757 | if (!dev) |
1758 | return NULL; | |
1da177e4 LT |
1759 | } |
1760 | ||
b23dd4fe | 1761 | if (!dev) { |
78fbfd8a DM |
1762 | struct rtable *rt = ip_route_output(net, |
1763 | imr->imr_multiaddr.s_addr, | |
1764 | 0, 0, 0); | |
b23dd4fe DM |
1765 | if (!IS_ERR(rt)) { |
1766 | dev = rt->dst.dev; | |
1767 | ip_rt_put(rt); | |
1768 | } | |
1da177e4 LT |
1769 | } |
1770 | if (dev) { | |
1771 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1772 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1773 | } |
1774 | return idev; | |
1775 | } | |
1776 | ||
1777 | /* | |
1778 | * Join a socket to a group | |
1779 | */ | |
1da177e4 LT |
1780 | |
1781 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1782 | __be32 *psfsrc) |
1da177e4 LT |
1783 | { |
1784 | struct ip_sf_list *psf, *psf_prev; | |
1785 | int rv = 0; | |
1786 | ||
1787 | psf_prev = NULL; | |
c71151f0 | 1788 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1789 | if (psf->sf_inaddr == *psfsrc) |
1790 | break; | |
1791 | psf_prev = psf; | |
1792 | } | |
1793 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1794 | /* source filter not found, or count wrong => bug */ | |
1795 | return -ESRCH; | |
1796 | } | |
1797 | psf->sf_count[sfmode]--; | |
1798 | if (psf->sf_count[sfmode] == 0) { | |
1799 | ip_rt_multicast_event(pmc->interface); | |
1800 | } | |
1801 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1802 | #ifdef CONFIG_IP_MULTICAST | |
1803 | struct in_device *in_dev = pmc->interface; | |
165094af | 1804 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1805 | #endif |
1806 | ||
1807 | /* no more filters for this source */ | |
1808 | if (psf_prev) | |
1809 | psf_prev->sf_next = psf->sf_next; | |
1810 | else | |
1811 | pmc->sources = psf->sf_next; | |
1812 | #ifdef CONFIG_IP_MULTICAST | |
1813 | if (psf->sf_oldin && | |
1814 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
165094af | 1815 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1816 | psf->sf_next = pmc->tomb; |
1817 | pmc->tomb = psf; | |
1818 | rv = 1; | |
1819 | } else | |
1820 | #endif | |
1821 | kfree(psf); | |
1822 | } | |
1823 | return rv; | |
1824 | } | |
1825 | ||
1826 | #ifndef CONFIG_IP_MULTICAST | |
1827 | #define igmp_ifc_event(x) do { } while (0) | |
1828 | #endif | |
1829 | ||
8f935bbd AV |
1830 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1831 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1832 | { |
1833 | struct ip_mc_list *pmc; | |
1834 | int changerec = 0; | |
1835 | int i, err; | |
1836 | ||
1837 | if (!in_dev) | |
1838 | return -ENODEV; | |
1d7138de ED |
1839 | rcu_read_lock(); |
1840 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1841 | if (*pmca == pmc->multiaddr) |
1842 | break; | |
1843 | } | |
1844 | if (!pmc) { | |
1845 | /* MCA not found?? bug */ | |
1d7138de | 1846 | rcu_read_unlock(); |
1da177e4 LT |
1847 | return -ESRCH; |
1848 | } | |
1849 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1850 | rcu_read_unlock(); |
1da177e4 LT |
1851 | #ifdef CONFIG_IP_MULTICAST |
1852 | sf_markstate(pmc); | |
1853 | #endif | |
1854 | if (!delta) { | |
1855 | err = -EINVAL; | |
1856 | if (!pmc->sfcount[sfmode]) | |
1857 | goto out_unlock; | |
1858 | pmc->sfcount[sfmode]--; | |
1859 | } | |
1860 | err = 0; | |
c71151f0 | 1861 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
1862 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
1863 | ||
1864 | changerec |= rv > 0; | |
1865 | if (!err && rv < 0) | |
1866 | err = rv; | |
1867 | } | |
1868 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1869 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1870 | pmc->sfcount[MCAST_INCLUDE]) { | |
1871 | #ifdef CONFIG_IP_MULTICAST | |
1872 | struct ip_sf_list *psf; | |
165094af | 1873 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1874 | #endif |
1875 | ||
1876 | /* filter mode change */ | |
1877 | pmc->sfmode = MCAST_INCLUDE; | |
1878 | #ifdef CONFIG_IP_MULTICAST | |
165094af | 1879 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1880 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 1881 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1882 | psf->sf_crcount = 0; |
1883 | igmp_ifc_event(pmc->interface); | |
1884 | } else if (sf_setstate(pmc) || changerec) { | |
1885 | igmp_ifc_event(pmc->interface); | |
1886 | #endif | |
1887 | } | |
1888 | out_unlock: | |
1889 | spin_unlock_bh(&pmc->lock); | |
1890 | return err; | |
1891 | } | |
1892 | ||
1893 | /* | |
1894 | * Add multicast single-source filter to the interface list | |
1895 | */ | |
1896 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1897 | __be32 *psfsrc) |
1da177e4 LT |
1898 | { |
1899 | struct ip_sf_list *psf, *psf_prev; | |
1900 | ||
1901 | psf_prev = NULL; | |
c71151f0 | 1902 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1903 | if (psf->sf_inaddr == *psfsrc) |
1904 | break; | |
1905 | psf_prev = psf; | |
1906 | } | |
1907 | if (!psf) { | |
0da974f4 | 1908 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1909 | if (!psf) |
1910 | return -ENOBUFS; | |
1da177e4 LT |
1911 | psf->sf_inaddr = *psfsrc; |
1912 | if (psf_prev) { | |
1913 | psf_prev->sf_next = psf; | |
1914 | } else | |
1915 | pmc->sources = psf; | |
1916 | } | |
1917 | psf->sf_count[sfmode]++; | |
1918 | if (psf->sf_count[sfmode] == 1) { | |
1919 | ip_rt_multicast_event(pmc->interface); | |
1920 | } | |
1921 | return 0; | |
1922 | } | |
1923 | ||
1924 | #ifdef CONFIG_IP_MULTICAST | |
1925 | static void sf_markstate(struct ip_mc_list *pmc) | |
1926 | { | |
1927 | struct ip_sf_list *psf; | |
1928 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1929 | ||
c71151f0 | 1930 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1931 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1932 | psf->sf_oldin = mca_xcount == | |
1933 | psf->sf_count[MCAST_EXCLUDE] && | |
1934 | !psf->sf_count[MCAST_INCLUDE]; | |
1935 | } else | |
1936 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1937 | } | |
1938 | ||
1939 | static int sf_setstate(struct ip_mc_list *pmc) | |
1940 | { | |
ad12583f | 1941 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1942 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1943 | int qrv = pmc->interface->mr_qrv; | |
1944 | int new_in, rv; | |
1945 | ||
1946 | rv = 0; | |
c71151f0 | 1947 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1948 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1949 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1950 | !psf->sf_count[MCAST_INCLUDE]; | |
1951 | } else | |
1952 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1953 | if (new_in) { |
1954 | if (!psf->sf_oldin) { | |
76edc605 | 1955 | struct ip_sf_list *prev = NULL; |
ad12583f | 1956 | |
c71151f0 | 1957 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
1958 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1959 | break; | |
1960 | prev = dpsf; | |
1961 | } | |
1962 | if (dpsf) { | |
1963 | if (prev) | |
1964 | prev->sf_next = dpsf->sf_next; | |
1965 | else | |
1966 | pmc->tomb = dpsf->sf_next; | |
1967 | kfree(dpsf); | |
1968 | } | |
1969 | psf->sf_crcount = qrv; | |
1970 | rv++; | |
1971 | } | |
1972 | } else if (psf->sf_oldin) { | |
1973 | ||
1974 | psf->sf_crcount = 0; | |
1975 | /* | |
1976 | * add or update "delete" records if an active filter | |
1977 | * is now inactive | |
1978 | */ | |
c71151f0 | 1979 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
1980 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1981 | break; | |
1982 | if (!dpsf) { | |
3ed37a6f | 1983 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1984 | if (!dpsf) |
1985 | continue; | |
1986 | *dpsf = *psf; | |
1987 | /* pmc->lock held by callers */ | |
1988 | dpsf->sf_next = pmc->tomb; | |
1989 | pmc->tomb = dpsf; | |
1990 | } | |
1991 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1992 | rv++; |
1993 | } | |
1994 | } | |
1995 | return rv; | |
1996 | } | |
1997 | #endif | |
1998 | ||
1999 | /* | |
2000 | * Add multicast source filter list to the interface list | |
2001 | */ | |
8f935bbd AV |
2002 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
2003 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
2004 | { |
2005 | struct ip_mc_list *pmc; | |
2006 | int isexclude; | |
2007 | int i, err; | |
2008 | ||
2009 | if (!in_dev) | |
2010 | return -ENODEV; | |
1d7138de ED |
2011 | rcu_read_lock(); |
2012 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
2013 | if (*pmca == pmc->multiaddr) |
2014 | break; | |
2015 | } | |
2016 | if (!pmc) { | |
2017 | /* MCA not found?? bug */ | |
1d7138de | 2018 | rcu_read_unlock(); |
1da177e4 LT |
2019 | return -ESRCH; |
2020 | } | |
2021 | spin_lock_bh(&pmc->lock); | |
1d7138de | 2022 | rcu_read_unlock(); |
1da177e4 LT |
2023 | |
2024 | #ifdef CONFIG_IP_MULTICAST | |
2025 | sf_markstate(pmc); | |
2026 | #endif | |
2027 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
2028 | if (!delta) | |
2029 | pmc->sfcount[sfmode]++; | |
2030 | err = 0; | |
c71151f0 | 2031 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 2032 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
2033 | if (err) |
2034 | break; | |
2035 | } | |
2036 | if (err) { | |
2037 | int j; | |
2038 | ||
685f94e6 JZ |
2039 | if (!delta) |
2040 | pmc->sfcount[sfmode]--; | |
c71151f0 | 2041 | for (j = 0; j < i; j++) |
a1889c0d | 2042 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
2043 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
2044 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 2045 | struct ip_sf_list *psf; |
165094af | 2046 | struct net *net = dev_net(pmc->interface->dev); |
cfcabdcc | 2047 | in_dev = pmc->interface; |
1da177e4 LT |
2048 | #endif |
2049 | ||
2050 | /* filter mode change */ | |
2051 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
2052 | pmc->sfmode = MCAST_EXCLUDE; | |
2053 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
2054 | pmc->sfmode = MCAST_INCLUDE; | |
2055 | #ifdef CONFIG_IP_MULTICAST | |
2056 | /* else no filters; keep old mode for reports */ | |
2057 | ||
165094af | 2058 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 2059 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 2060 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2061 | psf->sf_crcount = 0; |
2062 | igmp_ifc_event(in_dev); | |
2063 | } else if (sf_setstate(pmc)) { | |
2064 | igmp_ifc_event(in_dev); | |
2065 | #endif | |
2066 | } | |
2067 | spin_unlock_bh(&pmc->lock); | |
2068 | return err; | |
2069 | } | |
2070 | ||
2071 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
2072 | { | |
2073 | struct ip_sf_list *psf, *nextpsf; | |
2074 | ||
c71151f0 | 2075 | for (psf = pmc->tomb; psf; psf = nextpsf) { |
1da177e4 LT |
2076 | nextpsf = psf->sf_next; |
2077 | kfree(psf); | |
2078 | } | |
2079 | pmc->tomb = NULL; | |
c71151f0 | 2080 | for (psf = pmc->sources; psf; psf = nextpsf) { |
1da177e4 LT |
2081 | nextpsf = psf->sf_next; |
2082 | kfree(psf); | |
2083 | } | |
2084 | pmc->sources = NULL; | |
2085 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 2086 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
2087 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
2088 | } | |
2089 | ||
54ff9ef3 MRL |
2090 | /* Join a multicast group |
2091 | */ | |
2092 | ||
2093 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
1da177e4 | 2094 | { |
8f935bbd | 2095 | __be32 addr = imr->imr_multiaddr.s_addr; |
959d10f6 | 2096 | struct ip_mc_socklist *iml, *i; |
1da177e4 LT |
2097 | struct in_device *in_dev; |
2098 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 2099 | struct net *net = sock_net(sk); |
ca9b907d | 2100 | int ifindex; |
1da177e4 | 2101 | int count = 0; |
959d10f6 ED |
2102 | int err; |
2103 | ||
2104 | ASSERT_RTNL(); | |
1da177e4 | 2105 | |
f97c1e0c | 2106 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2107 | return -EINVAL; |
2108 | ||
877acedc | 2109 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
2110 | |
2111 | if (!in_dev) { | |
1da177e4 LT |
2112 | err = -ENODEV; |
2113 | goto done; | |
2114 | } | |
2115 | ||
1da177e4 | 2116 | err = -EADDRINUSE; |
ca9b907d | 2117 | ifindex = imr->imr_ifindex; |
1d7138de | 2118 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
2119 | if (i->multi.imr_multiaddr.s_addr == addr && |
2120 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 2121 | goto done; |
1da177e4 LT |
2122 | count++; |
2123 | } | |
2124 | err = -ENOBUFS; | |
815c5270 | 2125 | if (count >= net->ipv4.sysctl_igmp_max_memberships) |
ca9b907d | 2126 | goto done; |
a7e9ff73 | 2127 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
51456b29 | 2128 | if (!iml) |
1da177e4 | 2129 | goto done; |
ca9b907d | 2130 | |
1da177e4 | 2131 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 2132 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
2133 | iml->sflist = NULL; |
2134 | iml->sfmode = MCAST_EXCLUDE; | |
cf778b00 | 2135 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 2136 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 2137 | err = 0; |
1da177e4 | 2138 | done: |
1da177e4 LT |
2139 | return err; |
2140 | } | |
4bc2f18b | 2141 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
2142 | |
2143 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
2144 | struct in_device *in_dev) | |
2145 | { | |
1d7138de | 2146 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
2147 | int err; |
2148 | ||
51456b29 | 2149 | if (!psf) { |
1da177e4 LT |
2150 | /* any-source empty exclude case */ |
2151 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2152 | iml->sfmode, 0, NULL, 0); | |
2153 | } | |
2154 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 2155 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 2156 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
2157 | /* decrease mem now to avoid the memleak warning */ |
2158 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2159 | kfree_rcu(psf, rcu); |
1da177e4 LT |
2160 | return err; |
2161 | } | |
2162 | ||
54ff9ef3 | 2163 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
1da177e4 LT |
2164 | { |
2165 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
2166 | struct ip_mc_socklist *iml; |
2167 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 2168 | struct in_device *in_dev; |
877acedc | 2169 | struct net *net = sock_net(sk); |
8f935bbd | 2170 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 2171 | u32 ifindex; |
acd6e00b | 2172 | int ret = -EADDRNOTAVAIL; |
1da177e4 | 2173 | |
959d10f6 ED |
2174 | ASSERT_RTNL(); |
2175 | ||
877acedc | 2176 | in_dev = ip_mc_find_dev(net, imr); |
4eba7bb1 | 2177 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
52ad353a | 2178 | ret = -ENODEV; |
2179 | goto out; | |
2180 | } | |
84b42bae | 2181 | ifindex = imr->imr_ifindex; |
1d7138de ED |
2182 | for (imlp = &inet->mc_list; |
2183 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2184 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
2185 | if (iml->multi.imr_multiaddr.s_addr != group) |
2186 | continue; | |
2187 | if (ifindex) { | |
2188 | if (iml->multi.imr_ifindex != ifindex) | |
2189 | continue; | |
2190 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2191 | iml->multi.imr_address.s_addr) | |
2192 | continue; | |
1da177e4 | 2193 | |
acd6e00b | 2194 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 2195 | |
1d7138de | 2196 | *imlp = iml->next_rcu; |
acd6e00b | 2197 | |
4eba7bb1 AL |
2198 | if (in_dev) |
2199 | ip_mc_dec_group(in_dev, group); | |
959d10f6 | 2200 | |
c85bb41e FL |
2201 | /* decrease mem now to avoid the memleak warning */ |
2202 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2203 | kfree_rcu(iml, rcu); |
acd6e00b | 2204 | return 0; |
1da177e4 | 2205 | } |
52ad353a | 2206 | out: |
959d10f6 ED |
2207 | return ret; |
2208 | } | |
193ba924 | 2209 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
2210 | |
2211 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2212 | ip_mreq_source *mreqs, int ifindex) | |
2213 | { | |
2214 | int err; | |
2215 | struct ip_mreqn imr; | |
63007727 | 2216 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
2217 | struct ip_mc_socklist *pmc; |
2218 | struct in_device *in_dev = NULL; | |
2219 | struct inet_sock *inet = inet_sk(sk); | |
2220 | struct ip_sf_socklist *psl; | |
877acedc | 2221 | struct net *net = sock_net(sk); |
8cdaaa15 | 2222 | int leavegroup = 0; |
1da177e4 LT |
2223 | int i, j, rv; |
2224 | ||
f97c1e0c | 2225 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2226 | return -EINVAL; |
2227 | ||
54ff9ef3 | 2228 | ASSERT_RTNL(); |
1da177e4 LT |
2229 | |
2230 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2231 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2232 | imr.imr_ifindex = ifindex; | |
877acedc | 2233 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2234 | |
2235 | if (!in_dev) { | |
2236 | err = -ENODEV; | |
2237 | goto done; | |
2238 | } | |
2239 | err = -EADDRNOTAVAIL; | |
2240 | ||
1d7138de | 2241 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2242 | if ((pmc->multi.imr_multiaddr.s_addr == |
2243 | imr.imr_multiaddr.s_addr) && | |
2244 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2245 | break; |
2246 | } | |
917f2f10 DS |
2247 | if (!pmc) { /* must have a prior join */ |
2248 | err = -EINVAL; | |
1da177e4 | 2249 | goto done; |
917f2f10 | 2250 | } |
1da177e4 LT |
2251 | /* if a source filter was set, must be the same mode as before */ |
2252 | if (pmc->sflist) { | |
917f2f10 DS |
2253 | if (pmc->sfmode != omode) { |
2254 | err = -EINVAL; | |
1da177e4 | 2255 | goto done; |
917f2f10 | 2256 | } |
1da177e4 LT |
2257 | } else if (pmc->sfmode != omode) { |
2258 | /* allow mode switches for empty-set filters */ | |
2259 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2260 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2261 | NULL, 0); |
2262 | pmc->sfmode = omode; | |
2263 | } | |
2264 | ||
1d7138de | 2265 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2266 | if (!add) { |
2267 | if (!psl) | |
917f2f10 | 2268 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2269 | rv = !0; |
c71151f0 | 2270 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2271 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2272 | sizeof(__be32)); |
1da177e4 LT |
2273 | if (rv == 0) |
2274 | break; | |
2275 | } | |
2276 | if (rv) /* source not found */ | |
917f2f10 | 2277 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2278 | |
8cdaaa15 DS |
2279 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2280 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2281 | leavegroup = 1; | |
2282 | goto done; | |
2283 | } | |
2284 | ||
1da177e4 | 2285 | /* update the interface filter */ |
e905a9ed | 2286 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2287 | &mreqs->imr_sourceaddr, 1); |
2288 | ||
c71151f0 | 2289 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2290 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2291 | psl->sl_count--; | |
2292 | err = 0; | |
2293 | goto done; | |
2294 | } | |
2295 | /* else, add a new source to the filter */ | |
2296 | ||
166b6b2d | 2297 | if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { |
1da177e4 LT |
2298 | err = -ENOBUFS; |
2299 | goto done; | |
2300 | } | |
2301 | if (!psl || psl->sl_count == psl->sl_max) { | |
2302 | struct ip_sf_socklist *newpsl; | |
2303 | int count = IP_SFBLOCK; | |
2304 | ||
2305 | if (psl) | |
2306 | count += psl->sl_max; | |
8b3a7005 | 2307 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2308 | if (!newpsl) { |
2309 | err = -ENOBUFS; | |
2310 | goto done; | |
2311 | } | |
2312 | newpsl->sl_max = count; | |
2313 | newpsl->sl_count = count - IP_SFBLOCK; | |
2314 | if (psl) { | |
c71151f0 | 2315 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2316 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e FL |
2317 | /* decrease mem now to avoid the memleak warning */ |
2318 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2319 | kfree_rcu(psl, rcu); |
1da177e4 | 2320 | } |
cf778b00 | 2321 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2322 | psl = newpsl; |
1da177e4 LT |
2323 | } |
2324 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2325 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2326 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2327 | sizeof(__be32)); |
1da177e4 LT |
2328 | if (rv == 0) |
2329 | break; | |
2330 | } | |
2331 | if (rv == 0) /* address already there is an error */ | |
2332 | goto done; | |
c71151f0 | 2333 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2334 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2335 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2336 | psl->sl_count++; | |
2337 | err = 0; | |
2338 | /* update the interface list */ | |
e905a9ed | 2339 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2340 | &mreqs->imr_sourceaddr, 1); |
2341 | done: | |
8cdaaa15 | 2342 | if (leavegroup) |
54ff9ef3 | 2343 | err = ip_mc_leave_group(sk, &imr); |
1da177e4 LT |
2344 | return err; |
2345 | } | |
2346 | ||
2347 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2348 | { | |
9951f036 | 2349 | int err = 0; |
1da177e4 | 2350 | struct ip_mreqn imr; |
63007727 | 2351 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2352 | struct ip_mc_socklist *pmc; |
2353 | struct in_device *in_dev; | |
2354 | struct inet_sock *inet = inet_sk(sk); | |
2355 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2356 | struct net *net = sock_net(sk); |
9951f036 | 2357 | int leavegroup = 0; |
1da177e4 | 2358 | |
f97c1e0c | 2359 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2360 | return -EINVAL; |
2361 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2362 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2363 | return -EINVAL; | |
2364 | ||
54ff9ef3 | 2365 | ASSERT_RTNL(); |
1da177e4 LT |
2366 | |
2367 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2368 | imr.imr_address.s_addr = msf->imsf_interface; | |
2369 | imr.imr_ifindex = ifindex; | |
877acedc | 2370 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2371 | |
2372 | if (!in_dev) { | |
2373 | err = -ENODEV; | |
2374 | goto done; | |
2375 | } | |
1da177e4 | 2376 | |
9951f036 DS |
2377 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2378 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2379 | leavegroup = 1; | |
2380 | goto done; | |
2381 | } | |
2382 | ||
1d7138de | 2383 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2384 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2385 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2386 | break; | |
2387 | } | |
917f2f10 DS |
2388 | if (!pmc) { /* must have a prior join */ |
2389 | err = -EINVAL; | |
1da177e4 | 2390 | goto done; |
917f2f10 | 2391 | } |
1da177e4 | 2392 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2393 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2394 | GFP_KERNEL); | |
1da177e4 LT |
2395 | if (!newpsl) { |
2396 | err = -ENOBUFS; | |
2397 | goto done; | |
2398 | } | |
2399 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2400 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2401 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2402 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2403 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2404 | if (err) { | |
2405 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2406 | goto done; | |
2407 | } | |
8713dbf0 | 2408 | } else { |
1da177e4 | 2409 | newpsl = NULL; |
8713dbf0 YZ |
2410 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2411 | msf->imsf_fmode, 0, NULL, 0); | |
2412 | } | |
1d7138de | 2413 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2414 | if (psl) { |
2415 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2416 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2417 | /* decrease mem now to avoid the memleak warning */ |
2418 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2419 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2420 | } else |
2421 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2422 | 0, NULL, 0); | |
cf778b00 | 2423 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2424 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2425 | err = 0; |
1da177e4 | 2426 | done: |
9951f036 DS |
2427 | if (leavegroup) |
2428 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2429 | return err; |
2430 | } | |
2431 | ||
2432 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2433 | struct ip_msfilter __user *optval, int __user *optlen) | |
2434 | { | |
2435 | int err, len, count, copycount; | |
2436 | struct ip_mreqn imr; | |
63007727 | 2437 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2438 | struct ip_mc_socklist *pmc; |
2439 | struct in_device *in_dev; | |
2440 | struct inet_sock *inet = inet_sk(sk); | |
2441 | struct ip_sf_socklist *psl; | |
877acedc | 2442 | struct net *net = sock_net(sk); |
1da177e4 | 2443 | |
87e9f031 WC |
2444 | ASSERT_RTNL(); |
2445 | ||
f97c1e0c | 2446 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2447 | return -EINVAL; |
2448 | ||
1da177e4 LT |
2449 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
2450 | imr.imr_address.s_addr = msf->imsf_interface; | |
2451 | imr.imr_ifindex = 0; | |
877acedc | 2452 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2453 | |
2454 | if (!in_dev) { | |
2455 | err = -ENODEV; | |
2456 | goto done; | |
2457 | } | |
2458 | err = -EADDRNOTAVAIL; | |
2459 | ||
1d7138de | 2460 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2461 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2462 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2463 | break; | |
2464 | } | |
2465 | if (!pmc) /* must have a prior join */ | |
2466 | goto done; | |
2467 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2468 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2469 | if (!psl) { |
2470 | len = 0; | |
2471 | count = 0; | |
2472 | } else { | |
2473 | count = psl->sl_count; | |
2474 | } | |
2475 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2476 | len = copycount * sizeof(psl->sl_addr[0]); | |
2477 | msf->imsf_numsrc = count; | |
2478 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2479 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2480 | return -EFAULT; | |
2481 | } | |
2482 | if (len && | |
2483 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2484 | return -EFAULT; | |
2485 | return 0; | |
2486 | done: | |
1da177e4 LT |
2487 | return err; |
2488 | } | |
2489 | ||
2490 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2491 | struct group_filter __user *optval, int __user *optlen) | |
2492 | { | |
2493 | int err, i, count, copycount; | |
2494 | struct sockaddr_in *psin; | |
63007727 | 2495 | __be32 addr; |
1da177e4 LT |
2496 | struct ip_mc_socklist *pmc; |
2497 | struct inet_sock *inet = inet_sk(sk); | |
2498 | struct ip_sf_socklist *psl; | |
2499 | ||
87e9f031 WC |
2500 | ASSERT_RTNL(); |
2501 | ||
1da177e4 LT |
2502 | psin = (struct sockaddr_in *)&gsf->gf_group; |
2503 | if (psin->sin_family != AF_INET) | |
2504 | return -EINVAL; | |
2505 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2506 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2507 | return -EINVAL; |
2508 | ||
1da177e4 LT |
2509 | err = -EADDRNOTAVAIL; |
2510 | ||
1d7138de | 2511 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2512 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2513 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2514 | break; | |
2515 | } | |
2516 | if (!pmc) /* must have a prior join */ | |
2517 | goto done; | |
2518 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2519 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2520 | count = psl ? psl->sl_count : 0; |
2521 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2522 | gsf->gf_numsrc = count; | |
2523 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2524 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2525 | return -EFAULT; | |
2526 | } | |
c71151f0 | 2527 | for (i = 0; i < copycount; i++) { |
1da177e4 LT |
2528 | struct sockaddr_storage ss; |
2529 | ||
2530 | psin = (struct sockaddr_in *)&ss; | |
2531 | memset(&ss, 0, sizeof(ss)); | |
2532 | psin->sin_family = AF_INET; | |
2533 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2534 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2535 | return -EFAULT; | |
2536 | } | |
2537 | return 0; | |
2538 | done: | |
1da177e4 LT |
2539 | return err; |
2540 | } | |
2541 | ||
2542 | /* | |
2543 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2544 | */ | |
c0cda068 | 2545 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2546 | { |
2547 | struct inet_sock *inet = inet_sk(sk); | |
2548 | struct ip_mc_socklist *pmc; | |
2549 | struct ip_sf_socklist *psl; | |
2550 | int i; | |
c85bb41e | 2551 | int ret; |
1da177e4 | 2552 | |
c85bb41e | 2553 | ret = 1; |
f97c1e0c | 2554 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2555 | goto out; |
1da177e4 | 2556 | |
c85bb41e | 2557 | rcu_read_lock(); |
1d7138de | 2558 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2559 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2560 | pmc->multi.imr_ifindex == dif) | |
2561 | break; | |
2562 | } | |
c85bb41e | 2563 | ret = inet->mc_all; |
1da177e4 | 2564 | if (!pmc) |
c85bb41e | 2565 | goto unlock; |
1d7138de | 2566 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2567 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2568 | if (!psl) |
c85bb41e | 2569 | goto unlock; |
1da177e4 | 2570 | |
c71151f0 | 2571 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2572 | if (psl->sl_addr[i] == rmt_addr) |
2573 | break; | |
2574 | } | |
c85bb41e | 2575 | ret = 0; |
1da177e4 | 2576 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2577 | goto unlock; |
1da177e4 | 2578 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2579 | goto unlock; |
2580 | ret = 1; | |
2581 | unlock: | |
2582 | rcu_read_unlock(); | |
2583 | out: | |
2584 | return ret; | |
1da177e4 LT |
2585 | } |
2586 | ||
2587 | /* | |
2588 | * A socket is closing. | |
2589 | */ | |
2590 | ||
2591 | void ip_mc_drop_socket(struct sock *sk) | |
2592 | { | |
2593 | struct inet_sock *inet = inet_sk(sk); | |
2594 | struct ip_mc_socklist *iml; | |
877acedc | 2595 | struct net *net = sock_net(sk); |
1da177e4 | 2596 | |
51456b29 | 2597 | if (!inet->mc_list) |
1da177e4 LT |
2598 | return; |
2599 | ||
2600 | rtnl_lock(); | |
1d7138de | 2601 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2602 | struct in_device *in_dev; |
1da177e4 | 2603 | |
1d7138de | 2604 | inet->mc_list = iml->next_rcu; |
877acedc | 2605 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2606 | (void) ip_mc_leave_src(sk, iml, in_dev); |
00db4124 | 2607 | if (in_dev) |
1da177e4 | 2608 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2609 | /* decrease mem now to avoid the memleak warning */ |
2610 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2611 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2612 | } |
2613 | rtnl_unlock(); | |
2614 | } | |
2615 | ||
dbdd9a52 | 2616 | /* called with rcu_read_lock() */ |
2094acbb | 2617 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
1da177e4 LT |
2618 | { |
2619 | struct ip_mc_list *im; | |
e9897071 | 2620 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2621 | struct ip_sf_list *psf; |
2622 | int rv = 0; | |
2623 | ||
e9897071 ED |
2624 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2625 | if (mc_hash) { | |
c70eba74 | 2626 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2627 | |
2628 | for (im = rcu_dereference(mc_hash[hash]); | |
2629 | im != NULL; | |
2630 | im = rcu_dereference(im->next_hash)) { | |
2631 | if (im->multiaddr == mc_addr) | |
2632 | break; | |
2633 | } | |
2634 | } else { | |
2635 | for_each_pmc_rcu(in_dev, im) { | |
2636 | if (im->multiaddr == mc_addr) | |
2637 | break; | |
2638 | } | |
1da177e4 LT |
2639 | } |
2640 | if (im && proto == IPPROTO_IGMP) { | |
2641 | rv = 1; | |
2642 | } else if (im) { | |
2643 | if (src_addr) { | |
c71151f0 | 2644 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2645 | if (psf->sf_inaddr == src_addr) |
2646 | break; | |
2647 | } | |
2648 | if (psf) | |
2649 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2650 | psf->sf_count[MCAST_EXCLUDE] != | |
2651 | im->sfcount[MCAST_EXCLUDE]; | |
2652 | else | |
2653 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2654 | } else | |
2655 | rv = 1; /* unspecified source; tentatively allow */ | |
2656 | } | |
1da177e4 LT |
2657 | return rv; |
2658 | } | |
2659 | ||
2660 | #if defined(CONFIG_PROC_FS) | |
2661 | struct igmp_mc_iter_state { | |
7091e728 | 2662 | struct seq_net_private p; |
1da177e4 LT |
2663 | struct net_device *dev; |
2664 | struct in_device *in_dev; | |
2665 | }; | |
2666 | ||
2667 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2668 | ||
2669 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2670 | { | |
7091e728 | 2671 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2672 | struct ip_mc_list *im = NULL; |
2673 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2674 | ||
7562f876 | 2675 | state->in_dev = NULL; |
61fbab77 | 2676 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2677 | struct in_device *in_dev; |
6baff150 ED |
2678 | |
2679 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2680 | if (!in_dev) |
2681 | continue; | |
1d7138de | 2682 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2683 | if (im) { |
2684 | state->in_dev = in_dev; | |
2685 | break; | |
2686 | } | |
1da177e4 LT |
2687 | } |
2688 | return im; | |
2689 | } | |
2690 | ||
2691 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2692 | { | |
2693 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2694 | |
1d7138de ED |
2695 | im = rcu_dereference(im->next_rcu); |
2696 | while (!im) { | |
6baff150 | 2697 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2698 | if (!state->dev) { |
2699 | state->in_dev = NULL; | |
2700 | break; | |
2701 | } | |
6baff150 | 2702 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2703 | if (!state->in_dev) |
2704 | continue; | |
1d7138de | 2705 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2706 | } |
2707 | return im; | |
2708 | } | |
2709 | ||
2710 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2711 | { | |
2712 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2713 | if (im) | |
2714 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2715 | --pos; | |
2716 | return pos ? NULL : im; | |
2717 | } | |
2718 | ||
2719 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2720 | __acquires(rcu) |
1da177e4 | 2721 | { |
61fbab77 | 2722 | rcu_read_lock(); |
1da177e4 LT |
2723 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2724 | } | |
2725 | ||
2726 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2727 | { | |
2728 | struct ip_mc_list *im; | |
2729 | if (v == SEQ_START_TOKEN) | |
2730 | im = igmp_mc_get_first(seq); | |
2731 | else | |
2732 | im = igmp_mc_get_next(seq, v); | |
2733 | ++*pos; | |
2734 | return im; | |
2735 | } | |
2736 | ||
2737 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2738 | __releases(rcu) |
1da177e4 LT |
2739 | { |
2740 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2741 | |
2742 | state->in_dev = NULL; | |
1da177e4 | 2743 | state->dev = NULL; |
61fbab77 | 2744 | rcu_read_unlock(); |
1da177e4 LT |
2745 | } |
2746 | ||
2747 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2748 | { | |
2749 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2750 | seq_puts(seq, |
1da177e4 LT |
2751 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2752 | else { | |
2753 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2754 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2755 | char *querier; | |
a399a805 ED |
2756 | long delta; |
2757 | ||
1da177e4 LT |
2758 | #ifdef CONFIG_IP_MULTICAST |
2759 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2760 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2761 | "V3"; | |
2762 | #else | |
2763 | querier = "NONE"; | |
2764 | #endif | |
2765 | ||
e6b68883 | 2766 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2767 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2768 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2769 | } |
2770 | ||
a399a805 | 2771 | delta = im->timer.expires - jiffies; |
1da177e4 | 2772 | seq_printf(seq, |
338fcf98 | 2773 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2774 | im->multiaddr, im->users, |
a399a805 ED |
2775 | im->tm_running, |
2776 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2777 | im->reporter); |
2778 | } | |
2779 | return 0; | |
2780 | } | |
2781 | ||
f690808e | 2782 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2783 | .start = igmp_mc_seq_start, |
2784 | .next = igmp_mc_seq_next, | |
2785 | .stop = igmp_mc_seq_stop, | |
2786 | .show = igmp_mc_seq_show, | |
2787 | }; | |
2788 | ||
2789 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2790 | { | |
7091e728 | 2791 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2792 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2793 | } |
2794 | ||
9a32144e | 2795 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2796 | .owner = THIS_MODULE, |
2797 | .open = igmp_mc_seq_open, | |
2798 | .read = seq_read, | |
2799 | .llseek = seq_lseek, | |
7091e728 | 2800 | .release = seq_release_net, |
1da177e4 LT |
2801 | }; |
2802 | ||
2803 | struct igmp_mcf_iter_state { | |
7091e728 | 2804 | struct seq_net_private p; |
1da177e4 LT |
2805 | struct net_device *dev; |
2806 | struct in_device *idev; | |
2807 | struct ip_mc_list *im; | |
2808 | }; | |
2809 | ||
2810 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2811 | ||
2812 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2813 | { | |
7091e728 | 2814 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2815 | struct ip_sf_list *psf = NULL; |
2816 | struct ip_mc_list *im = NULL; | |
2817 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2818 | ||
7562f876 PE |
2819 | state->idev = NULL; |
2820 | state->im = NULL; | |
61fbab77 | 2821 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2822 | struct in_device *idev; |
6baff150 | 2823 | idev = __in_dev_get_rcu(state->dev); |
51456b29 | 2824 | if (unlikely(!idev)) |
1da177e4 | 2825 | continue; |
1d7138de | 2826 | im = rcu_dereference(idev->mc_list); |
00db4124 | 2827 | if (likely(im)) { |
1da177e4 LT |
2828 | spin_lock_bh(&im->lock); |
2829 | psf = im->sources; | |
00db4124 | 2830 | if (likely(psf)) { |
1da177e4 LT |
2831 | state->im = im; |
2832 | state->idev = idev; | |
2833 | break; | |
2834 | } | |
2835 | spin_unlock_bh(&im->lock); | |
2836 | } | |
1da177e4 LT |
2837 | } |
2838 | return psf; | |
2839 | } | |
2840 | ||
2841 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2842 | { | |
2843 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2844 | ||
2845 | psf = psf->sf_next; | |
2846 | while (!psf) { | |
2847 | spin_unlock_bh(&state->im->lock); | |
2848 | state->im = state->im->next; | |
2849 | while (!state->im) { | |
6baff150 | 2850 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2851 | if (!state->dev) { |
2852 | state->idev = NULL; | |
2853 | goto out; | |
2854 | } | |
6baff150 | 2855 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2856 | if (!state->idev) |
2857 | continue; | |
1d7138de | 2858 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2859 | } |
2860 | if (!state->im) | |
2861 | break; | |
2862 | spin_lock_bh(&state->im->lock); | |
2863 | psf = state->im->sources; | |
2864 | } | |
2865 | out: | |
2866 | return psf; | |
2867 | } | |
2868 | ||
2869 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2870 | { | |
2871 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2872 | if (psf) | |
2873 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2874 | --pos; | |
2875 | return pos ? NULL : psf; | |
2876 | } | |
2877 | ||
2878 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2879 | __acquires(rcu) |
1da177e4 | 2880 | { |
61fbab77 | 2881 | rcu_read_lock(); |
1da177e4 LT |
2882 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2883 | } | |
2884 | ||
2885 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2886 | { | |
2887 | struct ip_sf_list *psf; | |
2888 | if (v == SEQ_START_TOKEN) | |
2889 | psf = igmp_mcf_get_first(seq); | |
2890 | else | |
2891 | psf = igmp_mcf_get_next(seq, v); | |
2892 | ++*pos; | |
2893 | return psf; | |
2894 | } | |
2895 | ||
2896 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2897 | __releases(rcu) |
1da177e4 LT |
2898 | { |
2899 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
00db4124 | 2900 | if (likely(state->im)) { |
1da177e4 LT |
2901 | spin_unlock_bh(&state->im->lock); |
2902 | state->im = NULL; | |
2903 | } | |
1d7138de | 2904 | state->idev = NULL; |
1da177e4 | 2905 | state->dev = NULL; |
61fbab77 | 2906 | rcu_read_unlock(); |
1da177e4 LT |
2907 | } |
2908 | ||
2909 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2910 | { | |
2911 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2912 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2913 | ||
2914 | if (v == SEQ_START_TOKEN) { | |
1744bea1 | 2915 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
1da177e4 LT |
2916 | } else { |
2917 | seq_printf(seq, | |
2918 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2919 | "0x%08x %6lu %6lu\n", |
2920 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2921 | ntohl(state->im->multiaddr), |
2922 | ntohl(psf->sf_inaddr), | |
2923 | psf->sf_count[MCAST_INCLUDE], | |
2924 | psf->sf_count[MCAST_EXCLUDE]); | |
2925 | } | |
2926 | return 0; | |
2927 | } | |
2928 | ||
f690808e | 2929 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2930 | .start = igmp_mcf_seq_start, |
2931 | .next = igmp_mcf_seq_next, | |
2932 | .stop = igmp_mcf_seq_stop, | |
2933 | .show = igmp_mcf_seq_show, | |
2934 | }; | |
2935 | ||
2936 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2937 | { | |
7091e728 | 2938 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2939 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2940 | } |
2941 | ||
9a32144e | 2942 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2943 | .owner = THIS_MODULE, |
2944 | .open = igmp_mcf_seq_open, | |
2945 | .read = seq_read, | |
2946 | .llseek = seq_lseek, | |
7091e728 | 2947 | .release = seq_release_net, |
1da177e4 LT |
2948 | }; |
2949 | ||
2c8c1e72 | 2950 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2951 | { |
7091e728 | 2952 | struct proc_dir_entry *pde; |
93a714d6 | 2953 | int err; |
7091e728 | 2954 | |
d4beaa66 | 2955 | pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); |
7091e728 AD |
2956 | if (!pde) |
2957 | goto out_igmp; | |
d4beaa66 G |
2958 | pde = proc_create("mcfilter", S_IRUGO, net->proc_net, |
2959 | &igmp_mcf_seq_fops); | |
7091e728 AD |
2960 | if (!pde) |
2961 | goto out_mcfilter; | |
93a714d6 MC |
2962 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
2963 | SOCK_DGRAM, 0, net); | |
2964 | if (err < 0) { | |
2965 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
2966 | err); | |
2967 | goto out_sock; | |
2968 | } | |
2969 | ||
dcd87999 NB |
2970 | /* Sysctl initialization */ |
2971 | net->ipv4.sysctl_igmp_max_memberships = 20; | |
2972 | net->ipv4.sysctl_igmp_max_msf = 10; | |
2973 | /* IGMP reports for link-local multicast groups are enabled by default */ | |
2974 | net->ipv4.sysctl_igmp_llm_reports = 1; | |
2975 | net->ipv4.sysctl_igmp_qrv = 2; | |
1da177e4 | 2976 | return 0; |
7091e728 | 2977 | |
93a714d6 MC |
2978 | out_sock: |
2979 | remove_proc_entry("mcfilter", net->proc_net); | |
7091e728 | 2980 | out_mcfilter: |
ece31ffd | 2981 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
2982 | out_igmp: |
2983 | return -ENOMEM; | |
2984 | } | |
2985 | ||
2c8c1e72 | 2986 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 2987 | { |
ece31ffd G |
2988 | remove_proc_entry("mcfilter", net->proc_net); |
2989 | remove_proc_entry("igmp", net->proc_net); | |
93a714d6 | 2990 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
7091e728 AD |
2991 | } |
2992 | ||
2993 | static struct pernet_operations igmp_net_ops = { | |
2994 | .init = igmp_net_init, | |
2995 | .exit = igmp_net_exit, | |
2996 | }; | |
72c1d3bd | 2997 | #endif |
7091e728 | 2998 | |
4aa5dee4 JP |
2999 | static int igmp_netdev_event(struct notifier_block *this, |
3000 | unsigned long event, void *ptr) | |
3001 | { | |
3002 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3003 | struct in_device *in_dev; | |
3004 | ||
3005 | switch (event) { | |
3006 | case NETDEV_RESEND_IGMP: | |
3007 | in_dev = __in_dev_get_rtnl(dev); | |
3008 | if (in_dev) | |
3009 | ip_mc_rejoin_groups(in_dev); | |
3010 | break; | |
3011 | default: | |
3012 | break; | |
3013 | } | |
3014 | return NOTIFY_DONE; | |
3015 | } | |
3016 | ||
3017 | static struct notifier_block igmp_notifier = { | |
3018 | .notifier_call = igmp_netdev_event, | |
3019 | }; | |
3020 | ||
72c1d3bd | 3021 | int __init igmp_mc_init(void) |
7091e728 | 3022 | { |
72c1d3bd | 3023 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
3024 | int err; |
3025 | ||
3026 | err = register_pernet_subsys(&igmp_net_ops); | |
3027 | if (err) | |
3028 | return err; | |
3029 | err = register_netdevice_notifier(&igmp_notifier); | |
3030 | if (err) | |
3031 | goto reg_notif_fail; | |
3032 | return 0; | |
3033 | ||
3034 | reg_notif_fail: | |
3035 | unregister_pernet_subsys(&igmp_net_ops); | |
3036 | return err; | |
72c1d3bd WC |
3037 | #else |
3038 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 3039 | #endif |
72c1d3bd | 3040 | } |