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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
1da177e4 | 75 | #include <asm/uaccess.h> |
1da177e4 LT |
76 | #include <linux/types.h> |
77 | #include <linux/kernel.h> | |
78 | #include <linux/jiffies.h> | |
79 | #include <linux/string.h> | |
80 | #include <linux/socket.h> | |
81 | #include <linux/sockios.h> | |
82 | #include <linux/in.h> | |
83 | #include <linux/inet.h> | |
84 | #include <linux/netdevice.h> | |
85 | #include <linux/skbuff.h> | |
86 | #include <linux/inetdevice.h> | |
87 | #include <linux/igmp.h> | |
88 | #include <linux/if_arp.h> | |
89 | #include <linux/rtnetlink.h> | |
90 | #include <linux/times.h> | |
9d4a0314 | 91 | #include <linux/pkt_sched.h> |
14c85021 | 92 | |
457c4cbc | 93 | #include <net/net_namespace.h> |
14c85021 | 94 | #include <net/arp.h> |
1da177e4 LT |
95 | #include <net/ip.h> |
96 | #include <net/protocol.h> | |
97 | #include <net/route.h> | |
98 | #include <net/sock.h> | |
99 | #include <net/checksum.h> | |
93a714d6 | 100 | #include <net/inet_common.h> |
1da177e4 LT |
101 | #include <linux/netfilter_ipv4.h> |
102 | #ifdef CONFIG_IP_MROUTE | |
103 | #include <linux/mroute.h> | |
104 | #endif | |
105 | #ifdef CONFIG_PROC_FS | |
106 | #include <linux/proc_fs.h> | |
107 | #include <linux/seq_file.h> | |
108 | #endif | |
109 | ||
1da177e4 LT |
110 | #ifdef CONFIG_IP_MULTICAST |
111 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
112 | ||
436f7c20 FF |
113 | #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ) |
114 | #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ) | |
115 | #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) | |
116 | #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) | |
117 | #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) | |
118 | #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2 | |
1da177e4 LT |
119 | |
120 | ||
436f7c20 | 121 | #define IGMP_INITIAL_REPORT_DELAY (1) |
1da177e4 | 122 | |
436f7c20 | 123 | /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! |
1da177e4 LT |
124 | * IGMP specs require to report membership immediately after |
125 | * joining a group, but we delay the first report by a | |
126 | * small interval. It seems more natural and still does not | |
127 | * contradict to specs provided this delay is small enough. | |
128 | */ | |
129 | ||
42f811b8 | 130 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 131 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
132 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
133 | ((in_dev)->mr_v1_seen && \ | |
134 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
135 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 136 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
137 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
138 | ((in_dev)->mr_v2_seen && \ | |
139 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 | 140 | |
cab70040 WM |
141 | static int unsolicited_report_interval(struct in_device *in_dev) |
142 | { | |
2690048c WM |
143 | int interval_ms, interval_jiffies; |
144 | ||
cab70040 | 145 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
2690048c WM |
146 | interval_ms = IN_DEV_CONF_GET( |
147 | in_dev, | |
148 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
cab70040 | 149 | else /* v3 */ |
2690048c WM |
150 | interval_ms = IN_DEV_CONF_GET( |
151 | in_dev, | |
152 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
153 | ||
154 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
155 | ||
156 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
157 | * we always return a positive value. | |
158 | */ | |
159 | if (interval_jiffies <= 0) | |
160 | interval_jiffies = 1; | |
161 | return interval_jiffies; | |
cab70040 WM |
162 | } |
163 | ||
1da177e4 | 164 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
63007727 | 165 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); |
1da177e4 LT |
166 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
167 | static int sf_setstate(struct ip_mc_list *pmc); | |
168 | static void sf_markstate(struct ip_mc_list *pmc); | |
169 | #endif | |
170 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
171 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
172 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
173 | |
174 | static void ip_ma_put(struct ip_mc_list *im) | |
175 | { | |
176 | if (atomic_dec_and_test(&im->refcnt)) { | |
177 | in_dev_put(im->interface); | |
42ea299d | 178 | kfree_rcu(im, rcu); |
1da177e4 LT |
179 | } |
180 | } | |
181 | ||
d9aa9380 DM |
182 | #define for_each_pmc_rcu(in_dev, pmc) \ |
183 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
184 | pmc != NULL; \ | |
185 | pmc = rcu_dereference(pmc->next_rcu)) | |
186 | ||
187 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
188 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
189 | pmc != NULL; \ | |
190 | pmc = rtnl_dereference(pmc->next_rcu)) | |
191 | ||
1da177e4 LT |
192 | #ifdef CONFIG_IP_MULTICAST |
193 | ||
194 | /* | |
195 | * Timer management | |
196 | */ | |
197 | ||
1d7138de | 198 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
199 | { |
200 | spin_lock_bh(&im->lock); | |
201 | if (del_timer(&im->timer)) | |
202 | atomic_dec(&im->refcnt); | |
a7e9ff73 | 203 | im->tm_running = 0; |
1da177e4 LT |
204 | im->reporter = 0; |
205 | im->unsolicit_count = 0; | |
206 | spin_unlock_bh(&im->lock); | |
207 | } | |
208 | ||
209 | /* It must be called with locked im->lock */ | |
210 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
211 | { | |
63862b5b | 212 | int tv = prandom_u32() % max_delay; |
1da177e4 | 213 | |
a7e9ff73 | 214 | im->tm_running = 1; |
1da177e4 LT |
215 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
216 | atomic_inc(&im->refcnt); | |
217 | } | |
218 | ||
219 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
220 | { | |
63862b5b | 221 | int tv = prandom_u32() % in_dev->mr_maxdelay; |
1da177e4 LT |
222 | |
223 | in_dev->mr_gq_running = 1; | |
224 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
225 | in_dev_hold(in_dev); | |
226 | } | |
227 | ||
228 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
229 | { | |
63862b5b | 230 | int tv = prandom_u32() % delay; |
1da177e4 LT |
231 | |
232 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
233 | in_dev_hold(in_dev); | |
234 | } | |
235 | ||
236 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
237 | { | |
238 | spin_lock_bh(&im->lock); | |
239 | im->unsolicit_count = 0; | |
240 | if (del_timer(&im->timer)) { | |
241 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
242 | add_timer(&im->timer); | |
a7e9ff73 | 243 | im->tm_running = 1; |
1da177e4 LT |
244 | spin_unlock_bh(&im->lock); |
245 | return; | |
246 | } | |
247 | atomic_dec(&im->refcnt); | |
248 | } | |
249 | igmp_start_timer(im, max_delay); | |
250 | spin_unlock_bh(&im->lock); | |
251 | } | |
252 | ||
253 | ||
254 | /* | |
255 | * Send an IGMP report. | |
256 | */ | |
257 | ||
258 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
259 | ||
260 | ||
261 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
262 | int gdeleted, int sdeleted) | |
263 | { | |
264 | switch (type) { | |
265 | case IGMPV3_MODE_IS_INCLUDE: | |
266 | case IGMPV3_MODE_IS_EXCLUDE: | |
267 | if (gdeleted || sdeleted) | |
268 | return 0; | |
ad12583f DS |
269 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
270 | if (pmc->sfmode == MCAST_INCLUDE) | |
271 | return 1; | |
272 | /* don't include if this source is excluded | |
273 | * in all filters | |
274 | */ | |
275 | if (psf->sf_count[MCAST_INCLUDE]) | |
276 | return type == IGMPV3_MODE_IS_INCLUDE; | |
277 | return pmc->sfcount[MCAST_EXCLUDE] == | |
278 | psf->sf_count[MCAST_EXCLUDE]; | |
279 | } | |
280 | return 0; | |
1da177e4 LT |
281 | case IGMPV3_CHANGE_TO_INCLUDE: |
282 | if (gdeleted || sdeleted) | |
283 | return 0; | |
284 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
285 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
286 | if (gdeleted || sdeleted) | |
287 | return 0; | |
288 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
289 | psf->sf_count[MCAST_INCLUDE]) | |
290 | return 0; | |
291 | return pmc->sfcount[MCAST_EXCLUDE] == | |
292 | psf->sf_count[MCAST_EXCLUDE]; | |
293 | case IGMPV3_ALLOW_NEW_SOURCES: | |
294 | if (gdeleted || !psf->sf_crcount) | |
295 | return 0; | |
296 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
297 | case IGMPV3_BLOCK_OLD_SOURCES: | |
298 | if (pmc->sfmode == MCAST_INCLUDE) | |
299 | return gdeleted || (psf->sf_crcount && sdeleted); | |
300 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
301 | } | |
302 | return 0; | |
303 | } | |
304 | ||
305 | static int | |
306 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
307 | { | |
308 | struct ip_sf_list *psf; | |
309 | int scount = 0; | |
310 | ||
c71151f0 | 311 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
312 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
313 | continue; | |
314 | scount++; | |
315 | } | |
316 | return scount; | |
317 | } | |
318 | ||
4c672e4b | 319 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
1da177e4 LT |
320 | { |
321 | struct sk_buff *skb; | |
322 | struct rtable *rt; | |
323 | struct iphdr *pip; | |
324 | struct igmpv3_report *pig; | |
877acedc | 325 | struct net *net = dev_net(dev); |
31e4543d | 326 | struct flowi4 fl4; |
66088243 HX |
327 | int hlen = LL_RESERVED_SPACE(dev); |
328 | int tlen = dev->needed_tailroom; | |
4c672e4b | 329 | unsigned int size = mtu; |
1da177e4 | 330 | |
57e1ab6e | 331 | while (1) { |
66088243 | 332 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
333 | GFP_ATOMIC | __GFP_NOWARN); |
334 | if (skb) | |
335 | break; | |
336 | size >>= 1; | |
337 | if (size < 256) | |
338 | return NULL; | |
339 | } | |
9d4a0314 | 340 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 341 | |
31e4543d | 342 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
343 | 0, 0, |
344 | IPPROTO_IGMP, 0, dev->ifindex); | |
345 | if (IS_ERR(rt)) { | |
346 | kfree_skb(skb); | |
347 | return NULL; | |
1da177e4 | 348 | } |
1da177e4 | 349 | |
d8d1f30b | 350 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
351 | skb->dev = dev; |
352 | ||
66088243 | 353 | skb_reserve(skb, hlen); |
1837b2e2 | 354 | skb_tailroom_reserve(skb, mtu, tlen); |
1da177e4 | 355 | |
7e28ecc2 | 356 | skb_reset_network_header(skb); |
eddc9ec5 | 357 | pip = ip_hdr(skb); |
7e28ecc2 | 358 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
359 | |
360 | pip->version = 4; | |
361 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
362 | pip->tos = 0xc0; | |
363 | pip->frag_off = htons(IP_DF); | |
364 | pip->ttl = 1; | |
492f64ce DM |
365 | pip->daddr = fl4.daddr; |
366 | pip->saddr = fl4.saddr; | |
1da177e4 LT |
367 | pip->protocol = IPPROTO_IGMP; |
368 | pip->tot_len = 0; /* filled in later */ | |
b6a7719a | 369 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
370 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
371 | ((u8 *)&pip[1])[1] = 4; | |
372 | ((u8 *)&pip[1])[2] = 0; | |
373 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 374 | |
b0e380b1 | 375 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 376 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 377 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
378 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
379 | pig->resv1 = 0; | |
380 | pig->csum = 0; | |
381 | pig->resv2 = 0; | |
382 | pig->ngrec = 0; | |
383 | return skb; | |
384 | } | |
385 | ||
386 | static int igmpv3_sendpack(struct sk_buff *skb) | |
387 | { | |
d9edf9e2 | 388 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 389 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 390 | |
d9edf9e2 | 391 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 392 | |
33224b16 | 393 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
1da177e4 LT |
394 | } |
395 | ||
396 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
397 | { | |
a7e9ff73 | 398 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
399 | } |
400 | ||
401 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
402 | int type, struct igmpv3_grec **ppgr) | |
403 | { | |
404 | struct net_device *dev = pmc->interface->dev; | |
405 | struct igmpv3_report *pih; | |
406 | struct igmpv3_grec *pgr; | |
407 | ||
408 | if (!skb) | |
409 | skb = igmpv3_newpack(dev, dev->mtu); | |
410 | if (!skb) | |
411 | return NULL; | |
412 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
413 | pgr->grec_type = type; | |
414 | pgr->grec_auxwords = 0; | |
415 | pgr->grec_nsrcs = 0; | |
416 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 417 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
418 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
419 | *ppgr = pgr; | |
420 | return skb; | |
421 | } | |
422 | ||
4c672e4b | 423 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
424 | |
425 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
426 | int type, int gdeleted, int sdeleted) | |
427 | { | |
428 | struct net_device *dev = pmc->interface->dev; | |
87a8a2ae | 429 | struct net *net = dev_net(dev); |
1da177e4 LT |
430 | struct igmpv3_report *pih; |
431 | struct igmpv3_grec *pgr = NULL; | |
432 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 433 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
434 | |
435 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
436 | return skb; | |
87a8a2ae | 437 | if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 438 | return skb; |
1da177e4 LT |
439 | |
440 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
441 | type == IGMPV3_MODE_IS_EXCLUDE; | |
442 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
443 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
444 | ||
ad12583f DS |
445 | stotal = scount = 0; |
446 | ||
1da177e4 LT |
447 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
448 | ||
ad12583f DS |
449 | if (!*psf_list) |
450 | goto empty_source; | |
451 | ||
d9edf9e2 | 452 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
453 | |
454 | /* EX and TO_EX get a fresh packet, if needed */ | |
455 | if (truncate) { | |
456 | if (pih && pih->ngrec && | |
457 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
458 | if (skb) | |
459 | igmpv3_sendpack(skb); | |
460 | skb = igmpv3_newpack(dev, dev->mtu); | |
461 | } | |
462 | } | |
463 | first = 1; | |
1da177e4 | 464 | psf_prev = NULL; |
c71151f0 | 465 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 466 | __be32 *psrc; |
1da177e4 LT |
467 | |
468 | psf_next = psf->sf_next; | |
469 | ||
470 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
471 | psf_prev = psf; | |
472 | continue; | |
473 | } | |
474 | ||
475 | /* clear marks on query responses */ | |
476 | if (isquery) | |
477 | psf->sf_gsresp = 0; | |
478 | ||
63007727 | 479 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
480 | first*sizeof(struct igmpv3_grec)) { |
481 | if (truncate && !first) | |
482 | break; /* truncate these */ | |
483 | if (pgr) | |
484 | pgr->grec_nsrcs = htons(scount); | |
485 | if (skb) | |
486 | igmpv3_sendpack(skb); | |
487 | skb = igmpv3_newpack(dev, dev->mtu); | |
488 | first = 1; | |
489 | scount = 0; | |
490 | } | |
491 | if (first) { | |
492 | skb = add_grhead(skb, pmc, type, &pgr); | |
493 | first = 0; | |
494 | } | |
cc63f70b AD |
495 | if (!skb) |
496 | return NULL; | |
63007727 | 497 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 498 | *psrc = psf->sf_inaddr; |
ad12583f | 499 | scount++; stotal++; |
1da177e4 LT |
500 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
501 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
502 | psf->sf_crcount--; | |
503 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
504 | if (psf_prev) | |
505 | psf_prev->sf_next = psf->sf_next; | |
506 | else | |
507 | *psf_list = psf->sf_next; | |
508 | kfree(psf); | |
509 | continue; | |
510 | } | |
511 | } | |
512 | psf_prev = psf; | |
513 | } | |
ad12583f DS |
514 | |
515 | empty_source: | |
516 | if (!stotal) { | |
517 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
518 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
519 | return skb; | |
520 | if (pmc->crcount || isquery) { | |
521 | /* make sure we have room for group header */ | |
c71151f0 | 522 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
523 | igmpv3_sendpack(skb); |
524 | skb = NULL; /* add_grhead will get a new one */ | |
525 | } | |
526 | skb = add_grhead(skb, pmc, type, &pgr); | |
527 | } | |
528 | } | |
1da177e4 LT |
529 | if (pgr) |
530 | pgr->grec_nsrcs = htons(scount); | |
531 | ||
532 | if (isquery) | |
533 | pmc->gsquery = 0; /* clear query state on report */ | |
534 | return skb; | |
535 | } | |
536 | ||
537 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
538 | { | |
539 | struct sk_buff *skb = NULL; | |
87a8a2ae | 540 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
541 | int type; |
542 | ||
543 | if (!pmc) { | |
1d7138de ED |
544 | rcu_read_lock(); |
545 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
546 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
547 | continue; | |
df2cf4a7 | 548 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
87a8a2ae | 549 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 550 | continue; |
1da177e4 LT |
551 | spin_lock_bh(&pmc->lock); |
552 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
553 | type = IGMPV3_MODE_IS_EXCLUDE; | |
554 | else | |
555 | type = IGMPV3_MODE_IS_INCLUDE; | |
556 | skb = add_grec(skb, pmc, type, 0, 0); | |
557 | spin_unlock_bh(&pmc->lock); | |
558 | } | |
1d7138de | 559 | rcu_read_unlock(); |
1da177e4 LT |
560 | } else { |
561 | spin_lock_bh(&pmc->lock); | |
562 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
563 | type = IGMPV3_MODE_IS_EXCLUDE; | |
564 | else | |
565 | type = IGMPV3_MODE_IS_INCLUDE; | |
566 | skb = add_grec(skb, pmc, type, 0, 0); | |
567 | spin_unlock_bh(&pmc->lock); | |
568 | } | |
569 | if (!skb) | |
570 | return 0; | |
571 | return igmpv3_sendpack(skb); | |
572 | } | |
573 | ||
574 | /* | |
575 | * remove zero-count source records from a source filter list | |
576 | */ | |
577 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
578 | { | |
579 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
580 | ||
581 | psf_prev = NULL; | |
c71151f0 | 582 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
583 | psf_next = psf->sf_next; |
584 | if (psf->sf_crcount == 0) { | |
585 | if (psf_prev) | |
586 | psf_prev->sf_next = psf->sf_next; | |
587 | else | |
588 | *ppsf = psf->sf_next; | |
589 | kfree(psf); | |
590 | } else | |
591 | psf_prev = psf; | |
592 | } | |
593 | } | |
594 | ||
595 | static void igmpv3_send_cr(struct in_device *in_dev) | |
596 | { | |
597 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
598 | struct sk_buff *skb = NULL; | |
599 | int type, dtype; | |
600 | ||
1d7138de | 601 | rcu_read_lock(); |
1da177e4 LT |
602 | spin_lock_bh(&in_dev->mc_tomb_lock); |
603 | ||
604 | /* deleted MCA's */ | |
605 | pmc_prev = NULL; | |
c71151f0 | 606 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
607 | pmc_next = pmc->next; |
608 | if (pmc->sfmode == MCAST_INCLUDE) { | |
609 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
610 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
611 | skb = add_grec(skb, pmc, type, 1, 0); | |
612 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
613 | } | |
614 | if (pmc->crcount) { | |
1da177e4 LT |
615 | if (pmc->sfmode == MCAST_EXCLUDE) { |
616 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
617 | skb = add_grec(skb, pmc, type, 1, 0); | |
618 | } | |
ad12583f | 619 | pmc->crcount--; |
1da177e4 LT |
620 | if (pmc->crcount == 0) { |
621 | igmpv3_clear_zeros(&pmc->tomb); | |
622 | igmpv3_clear_zeros(&pmc->sources); | |
623 | } | |
624 | } | |
625 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
626 | if (pmc_prev) | |
627 | pmc_prev->next = pmc_next; | |
628 | else | |
629 | in_dev->mc_tomb = pmc_next; | |
630 | in_dev_put(pmc->interface); | |
631 | kfree(pmc); | |
632 | } else | |
633 | pmc_prev = pmc; | |
634 | } | |
635 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
636 | ||
637 | /* change recs */ | |
1d7138de | 638 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
639 | spin_lock_bh(&pmc->lock); |
640 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
641 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
642 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
643 | } else { | |
644 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
645 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
646 | } | |
647 | skb = add_grec(skb, pmc, type, 0, 0); | |
648 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
649 | ||
650 | /* filter mode changes */ | |
651 | if (pmc->crcount) { | |
1da177e4 LT |
652 | if (pmc->sfmode == MCAST_EXCLUDE) |
653 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
654 | else | |
655 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
656 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 657 | pmc->crcount--; |
1da177e4 LT |
658 | } |
659 | spin_unlock_bh(&pmc->lock); | |
660 | } | |
1d7138de | 661 | rcu_read_unlock(); |
1da177e4 LT |
662 | |
663 | if (!skb) | |
664 | return; | |
665 | (void) igmpv3_sendpack(skb); | |
666 | } | |
667 | ||
668 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
669 | int type) | |
670 | { | |
671 | struct sk_buff *skb; | |
672 | struct iphdr *iph; | |
673 | struct igmphdr *ih; | |
674 | struct rtable *rt; | |
675 | struct net_device *dev = in_dev->dev; | |
877acedc | 676 | struct net *net = dev_net(dev); |
63007727 | 677 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 678 | struct flowi4 fl4; |
63007727 | 679 | __be32 dst; |
66088243 | 680 | int hlen, tlen; |
1da177e4 LT |
681 | |
682 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
683 | return igmpv3_send_report(in_dev, pmc); | |
df2cf4a7 | 684 | |
87a8a2ae | 685 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 PD |
686 | return 0; |
687 | ||
688 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
1da177e4 LT |
689 | dst = IGMP_ALL_ROUTER; |
690 | else | |
691 | dst = group; | |
692 | ||
31e4543d | 693 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
694 | 0, 0, |
695 | IPPROTO_IGMP, 0, dev->ifindex); | |
696 | if (IS_ERR(rt)) | |
697 | return -1; | |
698 | ||
66088243 HX |
699 | hlen = LL_RESERVED_SPACE(dev); |
700 | tlen = dev->needed_tailroom; | |
701 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
51456b29 | 702 | if (!skb) { |
1da177e4 LT |
703 | ip_rt_put(rt); |
704 | return -1; | |
705 | } | |
9d4a0314 | 706 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 707 | |
d8d1f30b | 708 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 709 | |
66088243 | 710 | skb_reserve(skb, hlen); |
1da177e4 | 711 | |
7e28ecc2 | 712 | skb_reset_network_header(skb); |
eddc9ec5 | 713 | iph = ip_hdr(skb); |
7e28ecc2 | 714 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
715 | |
716 | iph->version = 4; | |
717 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
718 | iph->tos = 0xc0; | |
719 | iph->frag_off = htons(IP_DF); | |
720 | iph->ttl = 1; | |
721 | iph->daddr = dst; | |
492f64ce | 722 | iph->saddr = fl4.saddr; |
1da177e4 | 723 | iph->protocol = IPPROTO_IGMP; |
b6a7719a | 724 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
725 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
726 | ((u8 *)&iph[1])[1] = 4; | |
727 | ((u8 *)&iph[1])[2] = 0; | |
728 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 LT |
729 | |
730 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
731 | ih->type = type; |
732 | ih->code = 0; | |
733 | ih->csum = 0; | |
734 | ih->group = group; | |
735 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 736 | |
33224b16 | 737 | return ip_local_out(net, skb->sk, skb); |
1da177e4 LT |
738 | } |
739 | ||
740 | static void igmp_gq_timer_expire(unsigned long data) | |
741 | { | |
742 | struct in_device *in_dev = (struct in_device *)data; | |
743 | ||
744 | in_dev->mr_gq_running = 0; | |
745 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 746 | in_dev_put(in_dev); |
1da177e4 LT |
747 | } |
748 | ||
749 | static void igmp_ifc_timer_expire(unsigned long data) | |
750 | { | |
751 | struct in_device *in_dev = (struct in_device *)data; | |
752 | ||
753 | igmpv3_send_cr(in_dev); | |
754 | if (in_dev->mr_ifc_count) { | |
755 | in_dev->mr_ifc_count--; | |
cab70040 WM |
756 | igmp_ifc_start_timer(in_dev, |
757 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 758 | } |
e2401654 | 759 | in_dev_put(in_dev); |
1da177e4 LT |
760 | } |
761 | ||
762 | static void igmp_ifc_event(struct in_device *in_dev) | |
763 | { | |
165094af | 764 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
765 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
766 | return; | |
165094af | 767 | in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
768 | igmp_ifc_start_timer(in_dev, 1); |
769 | } | |
770 | ||
771 | ||
772 | static void igmp_timer_expire(unsigned long data) | |
773 | { | |
c71151f0 | 774 | struct ip_mc_list *im = (struct ip_mc_list *)data; |
1da177e4 LT |
775 | struct in_device *in_dev = im->interface; |
776 | ||
777 | spin_lock(&im->lock); | |
a7e9ff73 | 778 | im->tm_running = 0; |
1da177e4 LT |
779 | |
780 | if (im->unsolicit_count) { | |
781 | im->unsolicit_count--; | |
cab70040 | 782 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
1da177e4 LT |
783 | } |
784 | im->reporter = 1; | |
785 | spin_unlock(&im->lock); | |
786 | ||
787 | if (IGMP_V1_SEEN(in_dev)) | |
788 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
789 | else if (IGMP_V2_SEEN(in_dev)) | |
790 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
791 | else | |
792 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
793 | ||
794 | ip_ma_put(im); | |
795 | } | |
796 | ||
ad12583f | 797 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 798 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
799 | { |
800 | struct ip_sf_list *psf; | |
801 | int i, scount; | |
802 | ||
ad12583f | 803 | scount = 0; |
c71151f0 | 804 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
805 | if (scount == nsrcs) |
806 | break; | |
c71151f0 | 807 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 808 | /* skip inactive filters */ |
e05c4ad3 | 809 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
810 | pmc->sfcount[MCAST_EXCLUDE] != |
811 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 812 | break; |
ad12583f DS |
813 | if (srcs[i] == psf->sf_inaddr) { |
814 | scount++; | |
815 | break; | |
816 | } | |
817 | } | |
818 | } | |
819 | pmc->gsquery = 0; | |
820 | if (scount == nsrcs) /* all sources excluded */ | |
821 | return 0; | |
822 | return 1; | |
823 | } | |
824 | ||
ea4d9e72 | 825 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
826 | { |
827 | struct ip_sf_list *psf; | |
828 | int i, scount; | |
829 | ||
830 | if (pmc->sfmode == MCAST_EXCLUDE) | |
831 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
832 | ||
833 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 834 | scount = 0; |
c71151f0 | 835 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
836 | if (scount == nsrcs) |
837 | break; | |
c71151f0 | 838 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
839 | if (srcs[i] == psf->sf_inaddr) { |
840 | psf->sf_gsresp = 1; | |
841 | scount++; | |
842 | break; | |
843 | } | |
844 | } | |
ad12583f DS |
845 | if (!scount) { |
846 | pmc->gsquery = 0; | |
847 | return 0; | |
848 | } | |
849 | pmc->gsquery = 1; | |
850 | return 1; | |
1da177e4 LT |
851 | } |
852 | ||
d679c532 ED |
853 | /* return true if packet was dropped */ |
854 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
855 | { |
856 | struct ip_mc_list *im; | |
87a8a2ae | 857 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
858 | |
859 | /* Timers are only set for non-local groups */ | |
860 | ||
861 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 862 | return false; |
87a8a2ae | 863 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 864 | return false; |
1da177e4 | 865 | |
1d7138de ED |
866 | rcu_read_lock(); |
867 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
868 | if (im->multiaddr == group) { |
869 | igmp_stop_timer(im); | |
870 | break; | |
871 | } | |
872 | } | |
1d7138de | 873 | rcu_read_unlock(); |
d679c532 | 874 | return false; |
1da177e4 LT |
875 | } |
876 | ||
d679c532 ED |
877 | /* return true if packet was dropped */ |
878 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
879 | int len) |
880 | { | |
d9edf9e2 ACM |
881 | struct igmphdr *ih = igmp_hdr(skb); |
882 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 883 | struct ip_mc_list *im; |
63007727 | 884 | __be32 group = ih->group; |
1da177e4 LT |
885 | int max_delay; |
886 | int mark = 0; | |
87a8a2ae | 887 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
888 | |
889 | ||
5b7c8406 | 890 | if (len == 8) { |
1da177e4 LT |
891 | if (ih->code == 0) { |
892 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 893 | |
436f7c20 | 894 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
1da177e4 | 895 | in_dev->mr_v1_seen = jiffies + |
436f7c20 | 896 | IGMP_V1_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
897 | group = 0; |
898 | } else { | |
899 | /* v2 router present */ | |
900 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
901 | in_dev->mr_v2_seen = jiffies + | |
436f7c20 | 902 | IGMP_V2_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
903 | } |
904 | /* cancel the interface change timer */ | |
905 | in_dev->mr_ifc_count = 0; | |
906 | if (del_timer(&in_dev->mr_ifc_timer)) | |
907 | __in_dev_put(in_dev); | |
908 | /* clear deleted report items */ | |
909 | igmpv3_clear_delrec(in_dev); | |
910 | } else if (len < 12) { | |
d679c532 | 911 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
912 | } else if (IGMP_V1_SEEN(in_dev)) { |
913 | /* This is a v3 query with v1 queriers present */ | |
436f7c20 | 914 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
5b7c8406 DS |
915 | group = 0; |
916 | } else if (IGMP_V2_SEEN(in_dev)) { | |
917 | /* this is a v3 query with v2 queriers present; | |
918 | * Interpretation of the max_delay code is problematic here. | |
919 | * A real v2 host would use ih_code directly, while v3 has a | |
920 | * different encoding. We use the v3 encoding as more likely | |
921 | * to be intended in a v3 query. | |
922 | */ | |
923 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
924 | if (!max_delay) |
925 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
926 | } else { /* v3 */ |
927 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 928 | return true; |
e905a9ed | 929 | |
d9edf9e2 | 930 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 931 | if (ih3->nsrcs) { |
e905a9ed | 932 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 933 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 934 | return true; |
d9edf9e2 | 935 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
936 | } |
937 | ||
938 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
939 | if (!max_delay) | |
940 | max_delay = 1; /* can't mod w/ 0 */ | |
941 | in_dev->mr_maxdelay = max_delay; | |
942 | if (ih3->qrv) | |
943 | in_dev->mr_qrv = ih3->qrv; | |
944 | if (!group) { /* general query */ | |
945 | if (ih3->nsrcs) | |
b47bd8d2 | 946 | return true; /* no sources allowed */ |
1da177e4 | 947 | igmp_gq_start_timer(in_dev); |
d679c532 | 948 | return false; |
1da177e4 LT |
949 | } |
950 | /* mark sources to include, if group & source-specific */ | |
951 | mark = ih3->nsrcs != 0; | |
952 | } | |
953 | ||
954 | /* | |
955 | * - Start the timers in all of our membership records | |
956 | * that the query applies to for the interface on | |
957 | * which the query arrived excl. those that belong | |
958 | * to a "local" group (224.0.0.X) | |
959 | * - For timers already running check if they need to | |
960 | * be reset. | |
961 | * - Use the igmp->igmp_code field as the maximum | |
962 | * delay possible | |
963 | */ | |
1d7138de ED |
964 | rcu_read_lock(); |
965 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
966 | int changed; |
967 | ||
1da177e4 LT |
968 | if (group && group != im->multiaddr) |
969 | continue; | |
970 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
971 | continue; | |
df2cf4a7 | 972 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 973 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 974 | continue; |
1da177e4 LT |
975 | spin_lock_bh(&im->lock); |
976 | if (im->tm_running) | |
977 | im->gsquery = im->gsquery && mark; | |
978 | else | |
979 | im->gsquery = mark; | |
ad12583f | 980 | changed = !im->gsquery || |
e905a9ed | 981 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 982 | spin_unlock_bh(&im->lock); |
ad12583f DS |
983 | if (changed) |
984 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 985 | } |
1d7138de | 986 | rcu_read_unlock(); |
d679c532 | 987 | return false; |
1da177e4 LT |
988 | } |
989 | ||
9a57a9d2 | 990 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
991 | int igmp_rcv(struct sk_buff *skb) |
992 | { | |
993 | /* This basically follows the spec line by line -- see RFC1112 */ | |
994 | struct igmphdr *ih; | |
9a57a9d2 | 995 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 | 996 | int len = skb->len; |
d679c532 | 997 | bool dropped = true; |
1da177e4 | 998 | |
51456b29 | 999 | if (!in_dev) |
cd557bc1 | 1000 | goto drop; |
1da177e4 | 1001 | |
fb286bb2 | 1002 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 1003 | goto drop; |
fb286bb2 | 1004 | |
de08dc1a TH |
1005 | if (skb_checksum_simple_validate(skb)) |
1006 | goto drop; | |
1da177e4 | 1007 | |
d9edf9e2 | 1008 | ih = igmp_hdr(skb); |
1da177e4 LT |
1009 | switch (ih->type) { |
1010 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 1011 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
1012 | break; |
1013 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1014 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 1015 | /* Is it our report looped back? */ |
c7537967 | 1016 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1017 | break; |
24c69275 DS |
1018 | /* don't rely on MC router hearing unicast reports */ |
1019 | if (skb->pkt_type == PACKET_MULTICAST || | |
1020 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1021 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1022 | break; |
1023 | case IGMP_PIM: | |
1024 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1025 | return pim_rcv_v1(skb); |
1026 | #endif | |
c6b471e6 | 1027 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1028 | case IGMP_DVMRP: |
1029 | case IGMP_TRACE: | |
1030 | case IGMP_HOST_LEAVE_MESSAGE: | |
1031 | case IGMP_MTRACE: | |
1032 | case IGMP_MTRACE_RESP: | |
1033 | break; | |
1034 | default: | |
dd1c1853 | 1035 | break; |
1da177e4 | 1036 | } |
fb286bb2 | 1037 | |
cd557bc1 | 1038 | drop: |
d679c532 ED |
1039 | if (dropped) |
1040 | kfree_skb(skb); | |
1041 | else | |
1042 | consume_skb(skb); | |
1da177e4 LT |
1043 | return 0; |
1044 | } | |
1045 | ||
1046 | #endif | |
1047 | ||
1048 | ||
1049 | /* | |
1050 | * Add a filter to a device | |
1051 | */ | |
1052 | ||
63007727 | 1053 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1054 | { |
1055 | char buf[MAX_ADDR_LEN]; | |
1056 | struct net_device *dev = in_dev->dev; | |
1057 | ||
1058 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1059 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1060 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1061 | routine. Something sort of: |
1062 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1063 | --ANK | |
1064 | */ | |
1065 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1066 | dev_mc_add(dev, buf); |
1da177e4 LT |
1067 | } |
1068 | ||
1069 | /* | |
1070 | * Remove a filter from a device | |
1071 | */ | |
1072 | ||
63007727 | 1073 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1074 | { |
1075 | char buf[MAX_ADDR_LEN]; | |
1076 | struct net_device *dev = in_dev->dev; | |
1077 | ||
1078 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1079 | dev_mc_del(dev, buf); |
1da177e4 LT |
1080 | } |
1081 | ||
1082 | #ifdef CONFIG_IP_MULTICAST | |
1083 | /* | |
1084 | * deleted ip_mc_list manipulation | |
1085 | */ | |
1086 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1087 | { | |
1088 | struct ip_mc_list *pmc; | |
165094af | 1089 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1090 | |
1091 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1092 | * are actually used. In particular, the refcnt and users are not | |
1093 | * used for management of the delete list. Using the same structure | |
1094 | * for deleted items allows change reports to use common code with | |
1095 | * non-deleted or query-response MCA's. | |
1096 | */ | |
0da974f4 | 1097 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1098 | if (!pmc) |
1099 | return; | |
1da177e4 LT |
1100 | spin_lock_bh(&im->lock); |
1101 | pmc->interface = im->interface; | |
1102 | in_dev_hold(in_dev); | |
1103 | pmc->multiaddr = im->multiaddr; | |
165094af | 1104 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1105 | pmc->sfmode = im->sfmode; |
1106 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1107 | struct ip_sf_list *psf; | |
1108 | ||
1109 | pmc->tomb = im->tomb; | |
1110 | pmc->sources = im->sources; | |
1111 | im->tomb = im->sources = NULL; | |
c71151f0 | 1112 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1113 | psf->sf_crcount = pmc->crcount; |
1114 | } | |
1115 | spin_unlock_bh(&im->lock); | |
1116 | ||
1117 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1118 | pmc->next = in_dev->mc_tomb; | |
1119 | in_dev->mc_tomb = pmc; | |
1120 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1121 | } | |
1122 | ||
63007727 | 1123 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1124 | { |
1125 | struct ip_mc_list *pmc, *pmc_prev; | |
1126 | struct ip_sf_list *psf, *psf_next; | |
1127 | ||
1128 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1129 | pmc_prev = NULL; | |
c71151f0 | 1130 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1131 | if (pmc->multiaddr == multiaddr) |
1132 | break; | |
1133 | pmc_prev = pmc; | |
1134 | } | |
1135 | if (pmc) { | |
1136 | if (pmc_prev) | |
1137 | pmc_prev->next = pmc->next; | |
1138 | else | |
1139 | in_dev->mc_tomb = pmc->next; | |
1140 | } | |
1141 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1142 | if (pmc) { | |
c71151f0 | 1143 | for (psf = pmc->tomb; psf; psf = psf_next) { |
1da177e4 LT |
1144 | psf_next = psf->sf_next; |
1145 | kfree(psf); | |
1146 | } | |
1147 | in_dev_put(pmc->interface); | |
1148 | kfree(pmc); | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1153 | { | |
1154 | struct ip_mc_list *pmc, *nextpmc; | |
1155 | ||
1156 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1157 | pmc = in_dev->mc_tomb; | |
1158 | in_dev->mc_tomb = NULL; | |
1159 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1160 | ||
1161 | for (; pmc; pmc = nextpmc) { | |
1162 | nextpmc = pmc->next; | |
1163 | ip_mc_clear_src(pmc); | |
1164 | in_dev_put(pmc->interface); | |
1165 | kfree(pmc); | |
1166 | } | |
1167 | /* clear dead sources, too */ | |
1d7138de ED |
1168 | rcu_read_lock(); |
1169 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1170 | struct ip_sf_list *psf, *psf_next; |
1171 | ||
1172 | spin_lock_bh(&pmc->lock); | |
1173 | psf = pmc->tomb; | |
1174 | pmc->tomb = NULL; | |
1175 | spin_unlock_bh(&pmc->lock); | |
c71151f0 | 1176 | for (; psf; psf = psf_next) { |
1da177e4 LT |
1177 | psf_next = psf->sf_next; |
1178 | kfree(psf); | |
1179 | } | |
1180 | } | |
1d7138de | 1181 | rcu_read_unlock(); |
1da177e4 LT |
1182 | } |
1183 | #endif | |
1184 | ||
1185 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1186 | { | |
1187 | struct in_device *in_dev = im->interface; | |
1188 | #ifdef CONFIG_IP_MULTICAST | |
87a8a2ae | 1189 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1190 | int reporter; |
1191 | #endif | |
1192 | ||
1193 | if (im->loaded) { | |
1194 | im->loaded = 0; | |
1195 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1196 | } | |
1197 | ||
1198 | #ifdef CONFIG_IP_MULTICAST | |
1199 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1200 | return; | |
87a8a2ae | 1201 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1202 | return; |
1da177e4 LT |
1203 | |
1204 | reporter = im->reporter; | |
1205 | igmp_stop_timer(im); | |
1206 | ||
1207 | if (!in_dev->dead) { | |
1208 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1209 | return; |
1da177e4 LT |
1210 | if (IGMP_V2_SEEN(in_dev)) { |
1211 | if (reporter) | |
1212 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1213 | return; |
1da177e4 LT |
1214 | } |
1215 | /* IGMPv3 */ | |
1216 | igmpv3_add_delrec(in_dev, im); | |
1217 | ||
1218 | igmp_ifc_event(in_dev); | |
1219 | } | |
1da177e4 | 1220 | #endif |
1da177e4 LT |
1221 | } |
1222 | ||
1223 | static void igmp_group_added(struct ip_mc_list *im) | |
1224 | { | |
1225 | struct in_device *in_dev = im->interface; | |
dcd87999 | 1226 | #ifdef CONFIG_IP_MULTICAST |
87a8a2ae | 1227 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1228 | #endif |
1da177e4 LT |
1229 | |
1230 | if (im->loaded == 0) { | |
1231 | im->loaded = 1; | |
1232 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1233 | } | |
1234 | ||
1235 | #ifdef CONFIG_IP_MULTICAST | |
1236 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1237 | return; | |
87a8a2ae | 1238 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1239 | return; |
1da177e4 LT |
1240 | |
1241 | if (in_dev->dead) | |
1242 | return; | |
1243 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1244 | spin_lock_bh(&im->lock); | |
436f7c20 | 1245 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); |
1da177e4 LT |
1246 | spin_unlock_bh(&im->lock); |
1247 | return; | |
1248 | } | |
1249 | /* else, v3 */ | |
1250 | ||
165094af | 1251 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1252 | igmp_ifc_event(in_dev); |
1253 | #endif | |
1254 | } | |
1255 | ||
1256 | ||
1257 | /* | |
1258 | * Multicast list managers | |
1259 | */ | |
1260 | ||
e9897071 ED |
1261 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1262 | { | |
c70eba74 | 1263 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1264 | } |
1265 | ||
1266 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1267 | struct ip_mc_list *im) | |
1268 | { | |
1269 | struct ip_mc_list __rcu **mc_hash; | |
1270 | u32 hash; | |
1271 | ||
1272 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1273 | if (mc_hash) { | |
1274 | hash = ip_mc_hash(im); | |
c70eba74 | 1275 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1276 | rcu_assign_pointer(mc_hash[hash], im); |
1277 | return; | |
1278 | } | |
1279 | ||
1280 | /* do not use a hash table for small number of items */ | |
1281 | if (in_dev->mc_count < 4) | |
1282 | return; | |
1283 | ||
1284 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1285 | GFP_KERNEL); | |
1286 | if (!mc_hash) | |
1287 | return; | |
1288 | ||
1289 | for_each_pmc_rtnl(in_dev, im) { | |
1290 | hash = ip_mc_hash(im); | |
c70eba74 | 1291 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1292 | RCU_INIT_POINTER(mc_hash[hash], im); |
1293 | } | |
1294 | ||
1295 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1296 | } | |
1297 | ||
1298 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1299 | struct ip_mc_list *im) | |
1300 | { | |
1301 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1302 | struct ip_mc_list *aux; | |
1303 | ||
1304 | if (!mc_hash) | |
1305 | return; | |
1306 | mc_hash += ip_mc_hash(im); | |
1307 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1308 | mc_hash = &aux->next_hash; | |
1309 | *mc_hash = im->next_hash; | |
1310 | } | |
1311 | ||
1da177e4 LT |
1312 | |
1313 | /* | |
1314 | * A socket has joined a multicast group on device dev. | |
1315 | */ | |
1316 | ||
8f935bbd | 1317 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1318 | { |
1319 | struct ip_mc_list *im; | |
dcd87999 | 1320 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1321 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1322 | #endif |
1da177e4 LT |
1323 | |
1324 | ASSERT_RTNL(); | |
1325 | ||
1d7138de | 1326 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1327 | if (im->multiaddr == addr) { |
1328 | im->users++; | |
1329 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1330 | goto out; | |
1331 | } | |
1332 | } | |
1333 | ||
1d7138de | 1334 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1335 | if (!im) |
1336 | goto out; | |
1337 | ||
a7e9ff73 JK |
1338 | im->users = 1; |
1339 | im->interface = in_dev; | |
1da177e4 | 1340 | in_dev_hold(in_dev); |
a7e9ff73 | 1341 | im->multiaddr = addr; |
1da177e4 LT |
1342 | /* initial mode is (EX, empty) */ |
1343 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1344 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1345 | atomic_set(&im->refcnt, 1); |
1346 | spin_lock_init(&im->lock); | |
1347 | #ifdef CONFIG_IP_MULTICAST | |
179542a5 | 1348 | setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im); |
165094af | 1349 | im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1350 | #endif |
1d7138de ED |
1351 | |
1352 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1353 | in_dev->mc_count++; |
cf778b00 | 1354 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1355 | |
e9897071 ED |
1356 | ip_mc_hash_add(in_dev, im); |
1357 | ||
1da177e4 LT |
1358 | #ifdef CONFIG_IP_MULTICAST |
1359 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1360 | #endif | |
1361 | igmp_group_added(im); | |
1362 | if (!in_dev->dead) | |
1363 | ip_rt_multicast_event(in_dev); | |
1364 | out: | |
1365 | return; | |
1366 | } | |
4bc2f18b | 1367 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1368 | |
9afd85c9 LL |
1369 | static int ip_mc_check_iphdr(struct sk_buff *skb) |
1370 | { | |
1371 | const struct iphdr *iph; | |
1372 | unsigned int len; | |
1373 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1374 | ||
1375 | if (!pskb_may_pull(skb, offset)) | |
1376 | return -EINVAL; | |
1377 | ||
1378 | iph = ip_hdr(skb); | |
1379 | ||
1380 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1381 | return -EINVAL; | |
1382 | ||
1383 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1384 | ||
1385 | if (!pskb_may_pull(skb, offset)) | |
1386 | return -EINVAL; | |
1387 | ||
1388 | iph = ip_hdr(skb); | |
1389 | ||
1390 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1391 | return -EINVAL; | |
1392 | ||
1393 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1394 | if (skb->len < len || len < offset) | |
1395 | return -EINVAL; | |
1396 | ||
1397 | skb_set_transport_header(skb, offset); | |
1398 | ||
1399 | return 0; | |
1400 | } | |
1401 | ||
1402 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1403 | { | |
1404 | unsigned int len = skb_transport_offset(skb); | |
1405 | ||
1406 | len += sizeof(struct igmpv3_report); | |
1407 | ||
1408 | return pskb_may_pull(skb, len) ? 0 : -EINVAL; | |
1409 | } | |
1410 | ||
1411 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1412 | { | |
1413 | unsigned int len = skb_transport_offset(skb); | |
1414 | ||
1415 | len += sizeof(struct igmphdr); | |
1416 | if (skb->len < len) | |
1417 | return -EINVAL; | |
1418 | ||
1419 | /* IGMPv{1,2}? */ | |
1420 | if (skb->len != len) { | |
1421 | /* or IGMPv3? */ | |
1422 | len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); | |
1423 | if (skb->len < len || !pskb_may_pull(skb, len)) | |
1424 | return -EINVAL; | |
1425 | } | |
1426 | ||
1427 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1428 | * all-systems destination addresses (224.0.0.1) for general queries | |
1429 | */ | |
1430 | if (!igmp_hdr(skb)->group && | |
1431 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1432 | return -EINVAL; | |
1433 | ||
1434 | return 0; | |
1435 | } | |
1436 | ||
1437 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1438 | { | |
1439 | switch (igmp_hdr(skb)->type) { | |
1440 | case IGMP_HOST_LEAVE_MESSAGE: | |
1441 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1442 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1443 | /* fall through */ | |
1444 | return 0; | |
1445 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1446 | return ip_mc_check_igmp_reportv3(skb); | |
1447 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1448 | return ip_mc_check_igmp_query(skb); | |
1449 | default: | |
1450 | return -ENOMSG; | |
1451 | } | |
1452 | } | |
1453 | ||
1454 | static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) | |
1455 | { | |
1456 | return skb_checksum_simple_validate(skb); | |
1457 | } | |
1458 | ||
1459 | static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1460 | ||
1461 | { | |
1462 | struct sk_buff *skb_chk; | |
1463 | unsigned int transport_len; | |
1464 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); | |
a516993f | 1465 | int ret = -EINVAL; |
9afd85c9 LL |
1466 | |
1467 | transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); | |
1468 | ||
9afd85c9 LL |
1469 | skb_chk = skb_checksum_trimmed(skb, transport_len, |
1470 | ip_mc_validate_checksum); | |
1471 | if (!skb_chk) | |
a516993f | 1472 | goto err; |
9afd85c9 | 1473 | |
a516993f LL |
1474 | if (!pskb_may_pull(skb_chk, len)) |
1475 | goto err; | |
9afd85c9 LL |
1476 | |
1477 | ret = ip_mc_check_igmp_msg(skb_chk); | |
a516993f LL |
1478 | if (ret) |
1479 | goto err; | |
9afd85c9 LL |
1480 | |
1481 | if (skb_trimmed) | |
1482 | *skb_trimmed = skb_chk; | |
a516993f LL |
1483 | /* free now unneeded clone */ |
1484 | else if (skb_chk != skb) | |
9afd85c9 LL |
1485 | kfree_skb(skb_chk); |
1486 | ||
a516993f LL |
1487 | ret = 0; |
1488 | ||
1489 | err: | |
1490 | if (ret && skb_chk && skb_chk != skb) | |
1491 | kfree_skb(skb_chk); | |
1492 | ||
1493 | return ret; | |
9afd85c9 LL |
1494 | } |
1495 | ||
1496 | /** | |
1497 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1498 | * @skb: the skb to validate | |
1499 | * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) | |
1500 | * | |
1501 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
a516993f | 1502 | * skb transport header accordingly and returns zero. |
9afd85c9 LL |
1503 | * |
1504 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1505 | * standard | |
1506 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1507 | * -ENOMEM: A memory allocation failure happened. | |
1508 | * | |
1509 | * Optionally, an skb pointer might be provided via skb_trimmed (or set it | |
1510 | * to NULL): After parsing an IGMP packet successfully it will point to | |
1511 | * an skb which has its tail aligned to the IP packet end. This might | |
1512 | * either be the originally provided skb or a trimmed, cloned version if | |
1513 | * the skb frame had data beyond the IP packet. A cloned skb allows us | |
1514 | * to leave the original skb and its full frame unchanged (which might be | |
1515 | * desirable for layer 2 frame jugglers). | |
1516 | * | |
a516993f LL |
1517 | * Caller needs to set the skb network header and free any returned skb if it |
1518 | * differs from the provided skb. | |
9afd85c9 LL |
1519 | */ |
1520 | int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1521 | { | |
1522 | int ret = ip_mc_check_iphdr(skb); | |
1523 | ||
1524 | if (ret < 0) | |
1525 | return ret; | |
1526 | ||
1527 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1528 | return -ENOMSG; | |
1529 | ||
1530 | return __ip_mc_check_igmp(skb, skb_trimmed); | |
1531 | } | |
1532 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1533 | ||
a816c7c7 | 1534 | /* |
4aa5dee4 | 1535 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1536 | */ |
4aa5dee4 | 1537 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1538 | { |
08882669 | 1539 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1540 | struct ip_mc_list *im; |
1541 | int type; | |
87a8a2ae | 1542 | struct net *net = dev_net(in_dev->dev); |
a816c7c7 | 1543 | |
4aa5dee4 JP |
1544 | ASSERT_RTNL(); |
1545 | ||
1546 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1547 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1548 | continue; | |
df2cf4a7 | 1549 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1550 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1551 | continue; |
a816c7c7 | 1552 | |
866f3b25 ED |
1553 | /* a failover is happening and switches |
1554 | * must be notified immediately | |
1555 | */ | |
1556 | if (IGMP_V1_SEEN(in_dev)) | |
1557 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1558 | else if (IGMP_V2_SEEN(in_dev)) | |
1559 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1560 | else | |
1561 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1562 | igmp_send_report(in_dev, im, type); | |
1563 | } | |
a816c7c7 JV |
1564 | #endif |
1565 | } | |
1566 | ||
1da177e4 LT |
1567 | /* |
1568 | * A socket has left a multicast group on device dev | |
1569 | */ | |
1570 | ||
8f935bbd | 1571 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1572 | { |
1d7138de ED |
1573 | struct ip_mc_list *i; |
1574 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1575 | |
1da177e4 | 1576 | ASSERT_RTNL(); |
e905a9ed | 1577 | |
1d7138de ED |
1578 | for (ip = &in_dev->mc_list; |
1579 | (i = rtnl_dereference(*ip)) != NULL; | |
1580 | ip = &i->next_rcu) { | |
a7e9ff73 | 1581 | if (i->multiaddr == addr) { |
1da177e4 | 1582 | if (--i->users == 0) { |
e9897071 | 1583 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1584 | *ip = i->next_rcu; |
b8bae41e | 1585 | in_dev->mc_count--; |
1da177e4 | 1586 | igmp_group_dropped(i); |
24cf3af3 | 1587 | ip_mc_clear_src(i); |
1da177e4 LT |
1588 | |
1589 | if (!in_dev->dead) | |
1590 | ip_rt_multicast_event(in_dev); | |
1591 | ||
1592 | ip_ma_put(i); | |
1593 | return; | |
1594 | } | |
1595 | break; | |
1596 | } | |
1597 | } | |
1598 | } | |
4bc2f18b | 1599 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1600 | |
75c78500 MS |
1601 | /* Device changing type */ |
1602 | ||
1603 | void ip_mc_unmap(struct in_device *in_dev) | |
1604 | { | |
1d7138de | 1605 | struct ip_mc_list *pmc; |
75c78500 MS |
1606 | |
1607 | ASSERT_RTNL(); | |
1608 | ||
1d7138de ED |
1609 | for_each_pmc_rtnl(in_dev, pmc) |
1610 | igmp_group_dropped(pmc); | |
75c78500 MS |
1611 | } |
1612 | ||
1613 | void ip_mc_remap(struct in_device *in_dev) | |
1614 | { | |
1d7138de | 1615 | struct ip_mc_list *pmc; |
75c78500 MS |
1616 | |
1617 | ASSERT_RTNL(); | |
1618 | ||
1d7138de ED |
1619 | for_each_pmc_rtnl(in_dev, pmc) |
1620 | igmp_group_added(pmc); | |
75c78500 MS |
1621 | } |
1622 | ||
1da177e4 LT |
1623 | /* Device going down */ |
1624 | ||
1625 | void ip_mc_down(struct in_device *in_dev) | |
1626 | { | |
1d7138de | 1627 | struct ip_mc_list *pmc; |
1da177e4 LT |
1628 | |
1629 | ASSERT_RTNL(); | |
1630 | ||
1d7138de ED |
1631 | for_each_pmc_rtnl(in_dev, pmc) |
1632 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1633 | |
1634 | #ifdef CONFIG_IP_MULTICAST | |
1635 | in_dev->mr_ifc_count = 0; | |
1636 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1637 | __in_dev_put(in_dev); | |
1638 | in_dev->mr_gq_running = 0; | |
1639 | if (del_timer(&in_dev->mr_gq_timer)) | |
1640 | __in_dev_put(in_dev); | |
1641 | igmpv3_clear_delrec(in_dev); | |
1642 | #endif | |
1643 | ||
1644 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1645 | } | |
1646 | ||
1647 | void ip_mc_init_dev(struct in_device *in_dev) | |
1648 | { | |
dcd87999 | 1649 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1650 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1651 | #endif |
1da177e4 LT |
1652 | ASSERT_RTNL(); |
1653 | ||
1da177e4 | 1654 | #ifdef CONFIG_IP_MULTICAST |
b24b8a24 PE |
1655 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1656 | (unsigned long)in_dev); | |
b24b8a24 PE |
1657 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1658 | (unsigned long)in_dev); | |
165094af | 1659 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1660 | #endif |
1661 | ||
1da177e4 LT |
1662 | spin_lock_init(&in_dev->mc_tomb_lock); |
1663 | } | |
1664 | ||
1665 | /* Device going up */ | |
1666 | ||
1667 | void ip_mc_up(struct in_device *in_dev) | |
1668 | { | |
1d7138de | 1669 | struct ip_mc_list *pmc; |
dcd87999 | 1670 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1671 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1672 | #endif |
1da177e4 LT |
1673 | |
1674 | ASSERT_RTNL(); | |
1675 | ||
a9fe8e29 | 1676 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1677 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; |
a9fe8e29 | 1678 | #endif |
1da177e4 LT |
1679 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1680 | ||
1d7138de ED |
1681 | for_each_pmc_rtnl(in_dev, pmc) |
1682 | igmp_group_added(pmc); | |
1da177e4 LT |
1683 | } |
1684 | ||
1685 | /* | |
1686 | * Device is about to be destroyed: clean up. | |
1687 | */ | |
1688 | ||
1689 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1690 | { | |
1691 | struct ip_mc_list *i; | |
1692 | ||
1693 | ASSERT_RTNL(); | |
1694 | ||
1695 | /* Deactivate timers */ | |
1696 | ip_mc_down(in_dev); | |
1697 | ||
1d7138de ED |
1698 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1699 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1700 | in_dev->mc_count--; |
1d7138de | 1701 | |
24cf3af3 VF |
1702 | /* We've dropped the groups in ip_mc_down already */ |
1703 | ip_mc_clear_src(i); | |
1da177e4 | 1704 | ip_ma_put(i); |
1da177e4 | 1705 | } |
1da177e4 LT |
1706 | } |
1707 | ||
9e917dca | 1708 | /* RTNL is locked */ |
877acedc | 1709 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1710 | { |
1da177e4 LT |
1711 | struct net_device *dev = NULL; |
1712 | struct in_device *idev = NULL; | |
1713 | ||
1714 | if (imr->imr_ifindex) { | |
877acedc | 1715 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1716 | return idev; |
1717 | } | |
1718 | if (imr->imr_address.s_addr) { | |
9e917dca | 1719 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1720 | if (!dev) |
1721 | return NULL; | |
1da177e4 LT |
1722 | } |
1723 | ||
b23dd4fe | 1724 | if (!dev) { |
78fbfd8a DM |
1725 | struct rtable *rt = ip_route_output(net, |
1726 | imr->imr_multiaddr.s_addr, | |
1727 | 0, 0, 0); | |
b23dd4fe DM |
1728 | if (!IS_ERR(rt)) { |
1729 | dev = rt->dst.dev; | |
1730 | ip_rt_put(rt); | |
1731 | } | |
1da177e4 LT |
1732 | } |
1733 | if (dev) { | |
1734 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1735 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1736 | } |
1737 | return idev; | |
1738 | } | |
1739 | ||
1740 | /* | |
1741 | * Join a socket to a group | |
1742 | */ | |
1da177e4 LT |
1743 | |
1744 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1745 | __be32 *psfsrc) |
1da177e4 LT |
1746 | { |
1747 | struct ip_sf_list *psf, *psf_prev; | |
1748 | int rv = 0; | |
1749 | ||
1750 | psf_prev = NULL; | |
c71151f0 | 1751 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1752 | if (psf->sf_inaddr == *psfsrc) |
1753 | break; | |
1754 | psf_prev = psf; | |
1755 | } | |
1756 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1757 | /* source filter not found, or count wrong => bug */ | |
1758 | return -ESRCH; | |
1759 | } | |
1760 | psf->sf_count[sfmode]--; | |
1761 | if (psf->sf_count[sfmode] == 0) { | |
1762 | ip_rt_multicast_event(pmc->interface); | |
1763 | } | |
1764 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1765 | #ifdef CONFIG_IP_MULTICAST | |
1766 | struct in_device *in_dev = pmc->interface; | |
165094af | 1767 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1768 | #endif |
1769 | ||
1770 | /* no more filters for this source */ | |
1771 | if (psf_prev) | |
1772 | psf_prev->sf_next = psf->sf_next; | |
1773 | else | |
1774 | pmc->sources = psf->sf_next; | |
1775 | #ifdef CONFIG_IP_MULTICAST | |
1776 | if (psf->sf_oldin && | |
1777 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
165094af | 1778 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1779 | psf->sf_next = pmc->tomb; |
1780 | pmc->tomb = psf; | |
1781 | rv = 1; | |
1782 | } else | |
1783 | #endif | |
1784 | kfree(psf); | |
1785 | } | |
1786 | return rv; | |
1787 | } | |
1788 | ||
1789 | #ifndef CONFIG_IP_MULTICAST | |
1790 | #define igmp_ifc_event(x) do { } while (0) | |
1791 | #endif | |
1792 | ||
8f935bbd AV |
1793 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1794 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1795 | { |
1796 | struct ip_mc_list *pmc; | |
1797 | int changerec = 0; | |
1798 | int i, err; | |
1799 | ||
1800 | if (!in_dev) | |
1801 | return -ENODEV; | |
1d7138de ED |
1802 | rcu_read_lock(); |
1803 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1804 | if (*pmca == pmc->multiaddr) |
1805 | break; | |
1806 | } | |
1807 | if (!pmc) { | |
1808 | /* MCA not found?? bug */ | |
1d7138de | 1809 | rcu_read_unlock(); |
1da177e4 LT |
1810 | return -ESRCH; |
1811 | } | |
1812 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1813 | rcu_read_unlock(); |
1da177e4 LT |
1814 | #ifdef CONFIG_IP_MULTICAST |
1815 | sf_markstate(pmc); | |
1816 | #endif | |
1817 | if (!delta) { | |
1818 | err = -EINVAL; | |
1819 | if (!pmc->sfcount[sfmode]) | |
1820 | goto out_unlock; | |
1821 | pmc->sfcount[sfmode]--; | |
1822 | } | |
1823 | err = 0; | |
c71151f0 | 1824 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
1825 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
1826 | ||
1827 | changerec |= rv > 0; | |
1828 | if (!err && rv < 0) | |
1829 | err = rv; | |
1830 | } | |
1831 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1832 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1833 | pmc->sfcount[MCAST_INCLUDE]) { | |
1834 | #ifdef CONFIG_IP_MULTICAST | |
1835 | struct ip_sf_list *psf; | |
165094af | 1836 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1837 | #endif |
1838 | ||
1839 | /* filter mode change */ | |
1840 | pmc->sfmode = MCAST_INCLUDE; | |
1841 | #ifdef CONFIG_IP_MULTICAST | |
165094af | 1842 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1843 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 1844 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1845 | psf->sf_crcount = 0; |
1846 | igmp_ifc_event(pmc->interface); | |
1847 | } else if (sf_setstate(pmc) || changerec) { | |
1848 | igmp_ifc_event(pmc->interface); | |
1849 | #endif | |
1850 | } | |
1851 | out_unlock: | |
1852 | spin_unlock_bh(&pmc->lock); | |
1853 | return err; | |
1854 | } | |
1855 | ||
1856 | /* | |
1857 | * Add multicast single-source filter to the interface list | |
1858 | */ | |
1859 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1860 | __be32 *psfsrc) |
1da177e4 LT |
1861 | { |
1862 | struct ip_sf_list *psf, *psf_prev; | |
1863 | ||
1864 | psf_prev = NULL; | |
c71151f0 | 1865 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1866 | if (psf->sf_inaddr == *psfsrc) |
1867 | break; | |
1868 | psf_prev = psf; | |
1869 | } | |
1870 | if (!psf) { | |
0da974f4 | 1871 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1872 | if (!psf) |
1873 | return -ENOBUFS; | |
1da177e4 LT |
1874 | psf->sf_inaddr = *psfsrc; |
1875 | if (psf_prev) { | |
1876 | psf_prev->sf_next = psf; | |
1877 | } else | |
1878 | pmc->sources = psf; | |
1879 | } | |
1880 | psf->sf_count[sfmode]++; | |
1881 | if (psf->sf_count[sfmode] == 1) { | |
1882 | ip_rt_multicast_event(pmc->interface); | |
1883 | } | |
1884 | return 0; | |
1885 | } | |
1886 | ||
1887 | #ifdef CONFIG_IP_MULTICAST | |
1888 | static void sf_markstate(struct ip_mc_list *pmc) | |
1889 | { | |
1890 | struct ip_sf_list *psf; | |
1891 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1892 | ||
c71151f0 | 1893 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1894 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1895 | psf->sf_oldin = mca_xcount == | |
1896 | psf->sf_count[MCAST_EXCLUDE] && | |
1897 | !psf->sf_count[MCAST_INCLUDE]; | |
1898 | } else | |
1899 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1900 | } | |
1901 | ||
1902 | static int sf_setstate(struct ip_mc_list *pmc) | |
1903 | { | |
ad12583f | 1904 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1905 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1906 | int qrv = pmc->interface->mr_qrv; | |
1907 | int new_in, rv; | |
1908 | ||
1909 | rv = 0; | |
c71151f0 | 1910 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1911 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1912 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1913 | !psf->sf_count[MCAST_INCLUDE]; | |
1914 | } else | |
1915 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1916 | if (new_in) { |
1917 | if (!psf->sf_oldin) { | |
76edc605 | 1918 | struct ip_sf_list *prev = NULL; |
ad12583f | 1919 | |
c71151f0 | 1920 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
1921 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1922 | break; | |
1923 | prev = dpsf; | |
1924 | } | |
1925 | if (dpsf) { | |
1926 | if (prev) | |
1927 | prev->sf_next = dpsf->sf_next; | |
1928 | else | |
1929 | pmc->tomb = dpsf->sf_next; | |
1930 | kfree(dpsf); | |
1931 | } | |
1932 | psf->sf_crcount = qrv; | |
1933 | rv++; | |
1934 | } | |
1935 | } else if (psf->sf_oldin) { | |
1936 | ||
1937 | psf->sf_crcount = 0; | |
1938 | /* | |
1939 | * add or update "delete" records if an active filter | |
1940 | * is now inactive | |
1941 | */ | |
c71151f0 | 1942 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
1943 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1944 | break; | |
1945 | if (!dpsf) { | |
3ed37a6f | 1946 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1947 | if (!dpsf) |
1948 | continue; | |
1949 | *dpsf = *psf; | |
1950 | /* pmc->lock held by callers */ | |
1951 | dpsf->sf_next = pmc->tomb; | |
1952 | pmc->tomb = dpsf; | |
1953 | } | |
1954 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1955 | rv++; |
1956 | } | |
1957 | } | |
1958 | return rv; | |
1959 | } | |
1960 | #endif | |
1961 | ||
1962 | /* | |
1963 | * Add multicast source filter list to the interface list | |
1964 | */ | |
8f935bbd AV |
1965 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1966 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1967 | { |
1968 | struct ip_mc_list *pmc; | |
1969 | int isexclude; | |
1970 | int i, err; | |
1971 | ||
1972 | if (!in_dev) | |
1973 | return -ENODEV; | |
1d7138de ED |
1974 | rcu_read_lock(); |
1975 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1976 | if (*pmca == pmc->multiaddr) |
1977 | break; | |
1978 | } | |
1979 | if (!pmc) { | |
1980 | /* MCA not found?? bug */ | |
1d7138de | 1981 | rcu_read_unlock(); |
1da177e4 LT |
1982 | return -ESRCH; |
1983 | } | |
1984 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1985 | rcu_read_unlock(); |
1da177e4 LT |
1986 | |
1987 | #ifdef CONFIG_IP_MULTICAST | |
1988 | sf_markstate(pmc); | |
1989 | #endif | |
1990 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1991 | if (!delta) | |
1992 | pmc->sfcount[sfmode]++; | |
1993 | err = 0; | |
c71151f0 | 1994 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 1995 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
1996 | if (err) |
1997 | break; | |
1998 | } | |
1999 | if (err) { | |
2000 | int j; | |
2001 | ||
685f94e6 JZ |
2002 | if (!delta) |
2003 | pmc->sfcount[sfmode]--; | |
c71151f0 | 2004 | for (j = 0; j < i; j++) |
a1889c0d | 2005 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
2006 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
2007 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 2008 | struct ip_sf_list *psf; |
165094af | 2009 | struct net *net = dev_net(pmc->interface->dev); |
cfcabdcc | 2010 | in_dev = pmc->interface; |
1da177e4 LT |
2011 | #endif |
2012 | ||
2013 | /* filter mode change */ | |
2014 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
2015 | pmc->sfmode = MCAST_EXCLUDE; | |
2016 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
2017 | pmc->sfmode = MCAST_INCLUDE; | |
2018 | #ifdef CONFIG_IP_MULTICAST | |
2019 | /* else no filters; keep old mode for reports */ | |
2020 | ||
165094af | 2021 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 2022 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 2023 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2024 | psf->sf_crcount = 0; |
2025 | igmp_ifc_event(in_dev); | |
2026 | } else if (sf_setstate(pmc)) { | |
2027 | igmp_ifc_event(in_dev); | |
2028 | #endif | |
2029 | } | |
2030 | spin_unlock_bh(&pmc->lock); | |
2031 | return err; | |
2032 | } | |
2033 | ||
2034 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
2035 | { | |
2036 | struct ip_sf_list *psf, *nextpsf; | |
2037 | ||
c71151f0 | 2038 | for (psf = pmc->tomb; psf; psf = nextpsf) { |
1da177e4 LT |
2039 | nextpsf = psf->sf_next; |
2040 | kfree(psf); | |
2041 | } | |
2042 | pmc->tomb = NULL; | |
c71151f0 | 2043 | for (psf = pmc->sources; psf; psf = nextpsf) { |
1da177e4 LT |
2044 | nextpsf = psf->sf_next; |
2045 | kfree(psf); | |
2046 | } | |
2047 | pmc->sources = NULL; | |
2048 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 2049 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
2050 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
2051 | } | |
2052 | ||
54ff9ef3 MRL |
2053 | /* Join a multicast group |
2054 | */ | |
2055 | ||
2056 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
1da177e4 | 2057 | { |
8f935bbd | 2058 | __be32 addr = imr->imr_multiaddr.s_addr; |
959d10f6 | 2059 | struct ip_mc_socklist *iml, *i; |
1da177e4 LT |
2060 | struct in_device *in_dev; |
2061 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 2062 | struct net *net = sock_net(sk); |
ca9b907d | 2063 | int ifindex; |
1da177e4 | 2064 | int count = 0; |
959d10f6 ED |
2065 | int err; |
2066 | ||
2067 | ASSERT_RTNL(); | |
1da177e4 | 2068 | |
f97c1e0c | 2069 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2070 | return -EINVAL; |
2071 | ||
877acedc | 2072 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
2073 | |
2074 | if (!in_dev) { | |
1da177e4 LT |
2075 | err = -ENODEV; |
2076 | goto done; | |
2077 | } | |
2078 | ||
1da177e4 | 2079 | err = -EADDRINUSE; |
ca9b907d | 2080 | ifindex = imr->imr_ifindex; |
1d7138de | 2081 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
2082 | if (i->multi.imr_multiaddr.s_addr == addr && |
2083 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 2084 | goto done; |
1da177e4 LT |
2085 | count++; |
2086 | } | |
2087 | err = -ENOBUFS; | |
815c5270 | 2088 | if (count >= net->ipv4.sysctl_igmp_max_memberships) |
ca9b907d | 2089 | goto done; |
a7e9ff73 | 2090 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
51456b29 | 2091 | if (!iml) |
1da177e4 | 2092 | goto done; |
ca9b907d | 2093 | |
1da177e4 | 2094 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 2095 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
2096 | iml->sflist = NULL; |
2097 | iml->sfmode = MCAST_EXCLUDE; | |
cf778b00 | 2098 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 2099 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 2100 | err = 0; |
1da177e4 | 2101 | done: |
1da177e4 LT |
2102 | return err; |
2103 | } | |
4bc2f18b | 2104 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
2105 | |
2106 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
2107 | struct in_device *in_dev) | |
2108 | { | |
1d7138de | 2109 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
2110 | int err; |
2111 | ||
51456b29 | 2112 | if (!psf) { |
1da177e4 LT |
2113 | /* any-source empty exclude case */ |
2114 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2115 | iml->sfmode, 0, NULL, 0); | |
2116 | } | |
2117 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 2118 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 2119 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
2120 | /* decrease mem now to avoid the memleak warning */ |
2121 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2122 | kfree_rcu(psf, rcu); |
1da177e4 LT |
2123 | return err; |
2124 | } | |
2125 | ||
54ff9ef3 | 2126 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
1da177e4 LT |
2127 | { |
2128 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
2129 | struct ip_mc_socklist *iml; |
2130 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 2131 | struct in_device *in_dev; |
877acedc | 2132 | struct net *net = sock_net(sk); |
8f935bbd | 2133 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 2134 | u32 ifindex; |
acd6e00b | 2135 | int ret = -EADDRNOTAVAIL; |
1da177e4 | 2136 | |
959d10f6 ED |
2137 | ASSERT_RTNL(); |
2138 | ||
877acedc | 2139 | in_dev = ip_mc_find_dev(net, imr); |
4eba7bb1 | 2140 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
52ad353a | 2141 | ret = -ENODEV; |
2142 | goto out; | |
2143 | } | |
84b42bae | 2144 | ifindex = imr->imr_ifindex; |
1d7138de ED |
2145 | for (imlp = &inet->mc_list; |
2146 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2147 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
2148 | if (iml->multi.imr_multiaddr.s_addr != group) |
2149 | continue; | |
2150 | if (ifindex) { | |
2151 | if (iml->multi.imr_ifindex != ifindex) | |
2152 | continue; | |
2153 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2154 | iml->multi.imr_address.s_addr) | |
2155 | continue; | |
1da177e4 | 2156 | |
acd6e00b | 2157 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 2158 | |
1d7138de | 2159 | *imlp = iml->next_rcu; |
acd6e00b | 2160 | |
4eba7bb1 AL |
2161 | if (in_dev) |
2162 | ip_mc_dec_group(in_dev, group); | |
959d10f6 | 2163 | |
c85bb41e FL |
2164 | /* decrease mem now to avoid the memleak warning */ |
2165 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2166 | kfree_rcu(iml, rcu); |
acd6e00b | 2167 | return 0; |
1da177e4 | 2168 | } |
52ad353a | 2169 | out: |
959d10f6 ED |
2170 | return ret; |
2171 | } | |
193ba924 | 2172 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
2173 | |
2174 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2175 | ip_mreq_source *mreqs, int ifindex) | |
2176 | { | |
2177 | int err; | |
2178 | struct ip_mreqn imr; | |
63007727 | 2179 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
2180 | struct ip_mc_socklist *pmc; |
2181 | struct in_device *in_dev = NULL; | |
2182 | struct inet_sock *inet = inet_sk(sk); | |
2183 | struct ip_sf_socklist *psl; | |
877acedc | 2184 | struct net *net = sock_net(sk); |
8cdaaa15 | 2185 | int leavegroup = 0; |
1da177e4 LT |
2186 | int i, j, rv; |
2187 | ||
f97c1e0c | 2188 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2189 | return -EINVAL; |
2190 | ||
54ff9ef3 | 2191 | ASSERT_RTNL(); |
1da177e4 LT |
2192 | |
2193 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2194 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2195 | imr.imr_ifindex = ifindex; | |
877acedc | 2196 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2197 | |
2198 | if (!in_dev) { | |
2199 | err = -ENODEV; | |
2200 | goto done; | |
2201 | } | |
2202 | err = -EADDRNOTAVAIL; | |
2203 | ||
1d7138de | 2204 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2205 | if ((pmc->multi.imr_multiaddr.s_addr == |
2206 | imr.imr_multiaddr.s_addr) && | |
2207 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2208 | break; |
2209 | } | |
917f2f10 DS |
2210 | if (!pmc) { /* must have a prior join */ |
2211 | err = -EINVAL; | |
1da177e4 | 2212 | goto done; |
917f2f10 | 2213 | } |
1da177e4 LT |
2214 | /* if a source filter was set, must be the same mode as before */ |
2215 | if (pmc->sflist) { | |
917f2f10 DS |
2216 | if (pmc->sfmode != omode) { |
2217 | err = -EINVAL; | |
1da177e4 | 2218 | goto done; |
917f2f10 | 2219 | } |
1da177e4 LT |
2220 | } else if (pmc->sfmode != omode) { |
2221 | /* allow mode switches for empty-set filters */ | |
2222 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2223 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2224 | NULL, 0); |
2225 | pmc->sfmode = omode; | |
2226 | } | |
2227 | ||
1d7138de | 2228 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2229 | if (!add) { |
2230 | if (!psl) | |
917f2f10 | 2231 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2232 | rv = !0; |
c71151f0 | 2233 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2234 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2235 | sizeof(__be32)); |
1da177e4 LT |
2236 | if (rv == 0) |
2237 | break; | |
2238 | } | |
2239 | if (rv) /* source not found */ | |
917f2f10 | 2240 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2241 | |
8cdaaa15 DS |
2242 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2243 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2244 | leavegroup = 1; | |
2245 | goto done; | |
2246 | } | |
2247 | ||
1da177e4 | 2248 | /* update the interface filter */ |
e905a9ed | 2249 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2250 | &mreqs->imr_sourceaddr, 1); |
2251 | ||
c71151f0 | 2252 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2253 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2254 | psl->sl_count--; | |
2255 | err = 0; | |
2256 | goto done; | |
2257 | } | |
2258 | /* else, add a new source to the filter */ | |
2259 | ||
166b6b2d | 2260 | if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { |
1da177e4 LT |
2261 | err = -ENOBUFS; |
2262 | goto done; | |
2263 | } | |
2264 | if (!psl || psl->sl_count == psl->sl_max) { | |
2265 | struct ip_sf_socklist *newpsl; | |
2266 | int count = IP_SFBLOCK; | |
2267 | ||
2268 | if (psl) | |
2269 | count += psl->sl_max; | |
8b3a7005 | 2270 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2271 | if (!newpsl) { |
2272 | err = -ENOBUFS; | |
2273 | goto done; | |
2274 | } | |
2275 | newpsl->sl_max = count; | |
2276 | newpsl->sl_count = count - IP_SFBLOCK; | |
2277 | if (psl) { | |
c71151f0 | 2278 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2279 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e FL |
2280 | /* decrease mem now to avoid the memleak warning */ |
2281 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2282 | kfree_rcu(psl, rcu); |
1da177e4 | 2283 | } |
cf778b00 | 2284 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2285 | psl = newpsl; |
1da177e4 LT |
2286 | } |
2287 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2288 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2289 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2290 | sizeof(__be32)); |
1da177e4 LT |
2291 | if (rv == 0) |
2292 | break; | |
2293 | } | |
2294 | if (rv == 0) /* address already there is an error */ | |
2295 | goto done; | |
c71151f0 | 2296 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2297 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2298 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2299 | psl->sl_count++; | |
2300 | err = 0; | |
2301 | /* update the interface list */ | |
e905a9ed | 2302 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2303 | &mreqs->imr_sourceaddr, 1); |
2304 | done: | |
8cdaaa15 | 2305 | if (leavegroup) |
54ff9ef3 | 2306 | err = ip_mc_leave_group(sk, &imr); |
1da177e4 LT |
2307 | return err; |
2308 | } | |
2309 | ||
2310 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2311 | { | |
9951f036 | 2312 | int err = 0; |
1da177e4 | 2313 | struct ip_mreqn imr; |
63007727 | 2314 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2315 | struct ip_mc_socklist *pmc; |
2316 | struct in_device *in_dev; | |
2317 | struct inet_sock *inet = inet_sk(sk); | |
2318 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2319 | struct net *net = sock_net(sk); |
9951f036 | 2320 | int leavegroup = 0; |
1da177e4 | 2321 | |
f97c1e0c | 2322 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2323 | return -EINVAL; |
2324 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2325 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2326 | return -EINVAL; | |
2327 | ||
54ff9ef3 | 2328 | ASSERT_RTNL(); |
1da177e4 LT |
2329 | |
2330 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2331 | imr.imr_address.s_addr = msf->imsf_interface; | |
2332 | imr.imr_ifindex = ifindex; | |
877acedc | 2333 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2334 | |
2335 | if (!in_dev) { | |
2336 | err = -ENODEV; | |
2337 | goto done; | |
2338 | } | |
1da177e4 | 2339 | |
9951f036 DS |
2340 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2341 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2342 | leavegroup = 1; | |
2343 | goto done; | |
2344 | } | |
2345 | ||
1d7138de | 2346 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2347 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2348 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2349 | break; | |
2350 | } | |
917f2f10 DS |
2351 | if (!pmc) { /* must have a prior join */ |
2352 | err = -EINVAL; | |
1da177e4 | 2353 | goto done; |
917f2f10 | 2354 | } |
1da177e4 | 2355 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2356 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2357 | GFP_KERNEL); | |
1da177e4 LT |
2358 | if (!newpsl) { |
2359 | err = -ENOBUFS; | |
2360 | goto done; | |
2361 | } | |
2362 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2363 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2364 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2365 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2366 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2367 | if (err) { | |
2368 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2369 | goto done; | |
2370 | } | |
8713dbf0 | 2371 | } else { |
1da177e4 | 2372 | newpsl = NULL; |
8713dbf0 YZ |
2373 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2374 | msf->imsf_fmode, 0, NULL, 0); | |
2375 | } | |
1d7138de | 2376 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2377 | if (psl) { |
2378 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2379 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2380 | /* decrease mem now to avoid the memleak warning */ |
2381 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2382 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2383 | } else |
2384 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2385 | 0, NULL, 0); | |
cf778b00 | 2386 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2387 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2388 | err = 0; |
1da177e4 | 2389 | done: |
9951f036 DS |
2390 | if (leavegroup) |
2391 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2392 | return err; |
2393 | } | |
2394 | ||
2395 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2396 | struct ip_msfilter __user *optval, int __user *optlen) | |
2397 | { | |
2398 | int err, len, count, copycount; | |
2399 | struct ip_mreqn imr; | |
63007727 | 2400 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2401 | struct ip_mc_socklist *pmc; |
2402 | struct in_device *in_dev; | |
2403 | struct inet_sock *inet = inet_sk(sk); | |
2404 | struct ip_sf_socklist *psl; | |
877acedc | 2405 | struct net *net = sock_net(sk); |
1da177e4 | 2406 | |
87e9f031 WC |
2407 | ASSERT_RTNL(); |
2408 | ||
f97c1e0c | 2409 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2410 | return -EINVAL; |
2411 | ||
1da177e4 LT |
2412 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
2413 | imr.imr_address.s_addr = msf->imsf_interface; | |
2414 | imr.imr_ifindex = 0; | |
877acedc | 2415 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2416 | |
2417 | if (!in_dev) { | |
2418 | err = -ENODEV; | |
2419 | goto done; | |
2420 | } | |
2421 | err = -EADDRNOTAVAIL; | |
2422 | ||
1d7138de | 2423 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2424 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2425 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2426 | break; | |
2427 | } | |
2428 | if (!pmc) /* must have a prior join */ | |
2429 | goto done; | |
2430 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2431 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2432 | if (!psl) { |
2433 | len = 0; | |
2434 | count = 0; | |
2435 | } else { | |
2436 | count = psl->sl_count; | |
2437 | } | |
2438 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2439 | len = copycount * sizeof(psl->sl_addr[0]); | |
2440 | msf->imsf_numsrc = count; | |
2441 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2442 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2443 | return -EFAULT; | |
2444 | } | |
2445 | if (len && | |
2446 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2447 | return -EFAULT; | |
2448 | return 0; | |
2449 | done: | |
1da177e4 LT |
2450 | return err; |
2451 | } | |
2452 | ||
2453 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2454 | struct group_filter __user *optval, int __user *optlen) | |
2455 | { | |
2456 | int err, i, count, copycount; | |
2457 | struct sockaddr_in *psin; | |
63007727 | 2458 | __be32 addr; |
1da177e4 LT |
2459 | struct ip_mc_socklist *pmc; |
2460 | struct inet_sock *inet = inet_sk(sk); | |
2461 | struct ip_sf_socklist *psl; | |
2462 | ||
87e9f031 WC |
2463 | ASSERT_RTNL(); |
2464 | ||
1da177e4 LT |
2465 | psin = (struct sockaddr_in *)&gsf->gf_group; |
2466 | if (psin->sin_family != AF_INET) | |
2467 | return -EINVAL; | |
2468 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2469 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2470 | return -EINVAL; |
2471 | ||
1da177e4 LT |
2472 | err = -EADDRNOTAVAIL; |
2473 | ||
1d7138de | 2474 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2475 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2476 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2477 | break; | |
2478 | } | |
2479 | if (!pmc) /* must have a prior join */ | |
2480 | goto done; | |
2481 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2482 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2483 | count = psl ? psl->sl_count : 0; |
2484 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2485 | gsf->gf_numsrc = count; | |
2486 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2487 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2488 | return -EFAULT; | |
2489 | } | |
c71151f0 | 2490 | for (i = 0; i < copycount; i++) { |
1da177e4 LT |
2491 | struct sockaddr_storage ss; |
2492 | ||
2493 | psin = (struct sockaddr_in *)&ss; | |
2494 | memset(&ss, 0, sizeof(ss)); | |
2495 | psin->sin_family = AF_INET; | |
2496 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2497 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2498 | return -EFAULT; | |
2499 | } | |
2500 | return 0; | |
2501 | done: | |
1da177e4 LT |
2502 | return err; |
2503 | } | |
2504 | ||
2505 | /* | |
2506 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2507 | */ | |
c0cda068 | 2508 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2509 | { |
2510 | struct inet_sock *inet = inet_sk(sk); | |
2511 | struct ip_mc_socklist *pmc; | |
2512 | struct ip_sf_socklist *psl; | |
2513 | int i; | |
c85bb41e | 2514 | int ret; |
1da177e4 | 2515 | |
c85bb41e | 2516 | ret = 1; |
f97c1e0c | 2517 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2518 | goto out; |
1da177e4 | 2519 | |
c85bb41e | 2520 | rcu_read_lock(); |
1d7138de | 2521 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2522 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2523 | pmc->multi.imr_ifindex == dif) | |
2524 | break; | |
2525 | } | |
c85bb41e | 2526 | ret = inet->mc_all; |
1da177e4 | 2527 | if (!pmc) |
c85bb41e | 2528 | goto unlock; |
1d7138de | 2529 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2530 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2531 | if (!psl) |
c85bb41e | 2532 | goto unlock; |
1da177e4 | 2533 | |
c71151f0 | 2534 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2535 | if (psl->sl_addr[i] == rmt_addr) |
2536 | break; | |
2537 | } | |
c85bb41e | 2538 | ret = 0; |
1da177e4 | 2539 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2540 | goto unlock; |
1da177e4 | 2541 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2542 | goto unlock; |
2543 | ret = 1; | |
2544 | unlock: | |
2545 | rcu_read_unlock(); | |
2546 | out: | |
2547 | return ret; | |
1da177e4 LT |
2548 | } |
2549 | ||
2550 | /* | |
2551 | * A socket is closing. | |
2552 | */ | |
2553 | ||
2554 | void ip_mc_drop_socket(struct sock *sk) | |
2555 | { | |
2556 | struct inet_sock *inet = inet_sk(sk); | |
2557 | struct ip_mc_socklist *iml; | |
877acedc | 2558 | struct net *net = sock_net(sk); |
1da177e4 | 2559 | |
51456b29 | 2560 | if (!inet->mc_list) |
1da177e4 LT |
2561 | return; |
2562 | ||
2563 | rtnl_lock(); | |
1d7138de | 2564 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2565 | struct in_device *in_dev; |
1da177e4 | 2566 | |
1d7138de | 2567 | inet->mc_list = iml->next_rcu; |
877acedc | 2568 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2569 | (void) ip_mc_leave_src(sk, iml, in_dev); |
00db4124 | 2570 | if (in_dev) |
1da177e4 | 2571 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2572 | /* decrease mem now to avoid the memleak warning */ |
2573 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2574 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2575 | } |
2576 | rtnl_unlock(); | |
2577 | } | |
2578 | ||
dbdd9a52 | 2579 | /* called with rcu_read_lock() */ |
2094acbb | 2580 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
1da177e4 LT |
2581 | { |
2582 | struct ip_mc_list *im; | |
e9897071 | 2583 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2584 | struct ip_sf_list *psf; |
2585 | int rv = 0; | |
2586 | ||
e9897071 ED |
2587 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2588 | if (mc_hash) { | |
c70eba74 | 2589 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2590 | |
2591 | for (im = rcu_dereference(mc_hash[hash]); | |
2592 | im != NULL; | |
2593 | im = rcu_dereference(im->next_hash)) { | |
2594 | if (im->multiaddr == mc_addr) | |
2595 | break; | |
2596 | } | |
2597 | } else { | |
2598 | for_each_pmc_rcu(in_dev, im) { | |
2599 | if (im->multiaddr == mc_addr) | |
2600 | break; | |
2601 | } | |
1da177e4 LT |
2602 | } |
2603 | if (im && proto == IPPROTO_IGMP) { | |
2604 | rv = 1; | |
2605 | } else if (im) { | |
2606 | if (src_addr) { | |
c71151f0 | 2607 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2608 | if (psf->sf_inaddr == src_addr) |
2609 | break; | |
2610 | } | |
2611 | if (psf) | |
2612 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2613 | psf->sf_count[MCAST_EXCLUDE] != | |
2614 | im->sfcount[MCAST_EXCLUDE]; | |
2615 | else | |
2616 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2617 | } else | |
2618 | rv = 1; /* unspecified source; tentatively allow */ | |
2619 | } | |
1da177e4 LT |
2620 | return rv; |
2621 | } | |
2622 | ||
2623 | #if defined(CONFIG_PROC_FS) | |
2624 | struct igmp_mc_iter_state { | |
7091e728 | 2625 | struct seq_net_private p; |
1da177e4 LT |
2626 | struct net_device *dev; |
2627 | struct in_device *in_dev; | |
2628 | }; | |
2629 | ||
2630 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2631 | ||
2632 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2633 | { | |
7091e728 | 2634 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2635 | struct ip_mc_list *im = NULL; |
2636 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2637 | ||
7562f876 | 2638 | state->in_dev = NULL; |
61fbab77 | 2639 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2640 | struct in_device *in_dev; |
6baff150 ED |
2641 | |
2642 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2643 | if (!in_dev) |
2644 | continue; | |
1d7138de | 2645 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2646 | if (im) { |
2647 | state->in_dev = in_dev; | |
2648 | break; | |
2649 | } | |
1da177e4 LT |
2650 | } |
2651 | return im; | |
2652 | } | |
2653 | ||
2654 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2655 | { | |
2656 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2657 | |
1d7138de ED |
2658 | im = rcu_dereference(im->next_rcu); |
2659 | while (!im) { | |
6baff150 | 2660 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2661 | if (!state->dev) { |
2662 | state->in_dev = NULL; | |
2663 | break; | |
2664 | } | |
6baff150 | 2665 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2666 | if (!state->in_dev) |
2667 | continue; | |
1d7138de | 2668 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2669 | } |
2670 | return im; | |
2671 | } | |
2672 | ||
2673 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2674 | { | |
2675 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2676 | if (im) | |
2677 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2678 | --pos; | |
2679 | return pos ? NULL : im; | |
2680 | } | |
2681 | ||
2682 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2683 | __acquires(rcu) |
1da177e4 | 2684 | { |
61fbab77 | 2685 | rcu_read_lock(); |
1da177e4 LT |
2686 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2687 | } | |
2688 | ||
2689 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2690 | { | |
2691 | struct ip_mc_list *im; | |
2692 | if (v == SEQ_START_TOKEN) | |
2693 | im = igmp_mc_get_first(seq); | |
2694 | else | |
2695 | im = igmp_mc_get_next(seq, v); | |
2696 | ++*pos; | |
2697 | return im; | |
2698 | } | |
2699 | ||
2700 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2701 | __releases(rcu) |
1da177e4 LT |
2702 | { |
2703 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2704 | |
2705 | state->in_dev = NULL; | |
1da177e4 | 2706 | state->dev = NULL; |
61fbab77 | 2707 | rcu_read_unlock(); |
1da177e4 LT |
2708 | } |
2709 | ||
2710 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2711 | { | |
2712 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2713 | seq_puts(seq, |
1da177e4 LT |
2714 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2715 | else { | |
2716 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2717 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2718 | char *querier; | |
a399a805 ED |
2719 | long delta; |
2720 | ||
1da177e4 LT |
2721 | #ifdef CONFIG_IP_MULTICAST |
2722 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2723 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2724 | "V3"; | |
2725 | #else | |
2726 | querier = "NONE"; | |
2727 | #endif | |
2728 | ||
e6b68883 | 2729 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2730 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2731 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2732 | } |
2733 | ||
a399a805 | 2734 | delta = im->timer.expires - jiffies; |
1da177e4 | 2735 | seq_printf(seq, |
338fcf98 | 2736 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2737 | im->multiaddr, im->users, |
a399a805 ED |
2738 | im->tm_running, |
2739 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2740 | im->reporter); |
2741 | } | |
2742 | return 0; | |
2743 | } | |
2744 | ||
f690808e | 2745 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2746 | .start = igmp_mc_seq_start, |
2747 | .next = igmp_mc_seq_next, | |
2748 | .stop = igmp_mc_seq_stop, | |
2749 | .show = igmp_mc_seq_show, | |
2750 | }; | |
2751 | ||
2752 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2753 | { | |
7091e728 | 2754 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2755 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2756 | } |
2757 | ||
9a32144e | 2758 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2759 | .owner = THIS_MODULE, |
2760 | .open = igmp_mc_seq_open, | |
2761 | .read = seq_read, | |
2762 | .llseek = seq_lseek, | |
7091e728 | 2763 | .release = seq_release_net, |
1da177e4 LT |
2764 | }; |
2765 | ||
2766 | struct igmp_mcf_iter_state { | |
7091e728 | 2767 | struct seq_net_private p; |
1da177e4 LT |
2768 | struct net_device *dev; |
2769 | struct in_device *idev; | |
2770 | struct ip_mc_list *im; | |
2771 | }; | |
2772 | ||
2773 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2774 | ||
2775 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2776 | { | |
7091e728 | 2777 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2778 | struct ip_sf_list *psf = NULL; |
2779 | struct ip_mc_list *im = NULL; | |
2780 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2781 | ||
7562f876 PE |
2782 | state->idev = NULL; |
2783 | state->im = NULL; | |
61fbab77 | 2784 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2785 | struct in_device *idev; |
6baff150 | 2786 | idev = __in_dev_get_rcu(state->dev); |
51456b29 | 2787 | if (unlikely(!idev)) |
1da177e4 | 2788 | continue; |
1d7138de | 2789 | im = rcu_dereference(idev->mc_list); |
00db4124 | 2790 | if (likely(im)) { |
1da177e4 LT |
2791 | spin_lock_bh(&im->lock); |
2792 | psf = im->sources; | |
00db4124 | 2793 | if (likely(psf)) { |
1da177e4 LT |
2794 | state->im = im; |
2795 | state->idev = idev; | |
2796 | break; | |
2797 | } | |
2798 | spin_unlock_bh(&im->lock); | |
2799 | } | |
1da177e4 LT |
2800 | } |
2801 | return psf; | |
2802 | } | |
2803 | ||
2804 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2805 | { | |
2806 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2807 | ||
2808 | psf = psf->sf_next; | |
2809 | while (!psf) { | |
2810 | spin_unlock_bh(&state->im->lock); | |
2811 | state->im = state->im->next; | |
2812 | while (!state->im) { | |
6baff150 | 2813 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2814 | if (!state->dev) { |
2815 | state->idev = NULL; | |
2816 | goto out; | |
2817 | } | |
6baff150 | 2818 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2819 | if (!state->idev) |
2820 | continue; | |
1d7138de | 2821 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2822 | } |
2823 | if (!state->im) | |
2824 | break; | |
2825 | spin_lock_bh(&state->im->lock); | |
2826 | psf = state->im->sources; | |
2827 | } | |
2828 | out: | |
2829 | return psf; | |
2830 | } | |
2831 | ||
2832 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2833 | { | |
2834 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2835 | if (psf) | |
2836 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2837 | --pos; | |
2838 | return pos ? NULL : psf; | |
2839 | } | |
2840 | ||
2841 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2842 | __acquires(rcu) |
1da177e4 | 2843 | { |
61fbab77 | 2844 | rcu_read_lock(); |
1da177e4 LT |
2845 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2846 | } | |
2847 | ||
2848 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2849 | { | |
2850 | struct ip_sf_list *psf; | |
2851 | if (v == SEQ_START_TOKEN) | |
2852 | psf = igmp_mcf_get_first(seq); | |
2853 | else | |
2854 | psf = igmp_mcf_get_next(seq, v); | |
2855 | ++*pos; | |
2856 | return psf; | |
2857 | } | |
2858 | ||
2859 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2860 | __releases(rcu) |
1da177e4 LT |
2861 | { |
2862 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
00db4124 | 2863 | if (likely(state->im)) { |
1da177e4 LT |
2864 | spin_unlock_bh(&state->im->lock); |
2865 | state->im = NULL; | |
2866 | } | |
1d7138de | 2867 | state->idev = NULL; |
1da177e4 | 2868 | state->dev = NULL; |
61fbab77 | 2869 | rcu_read_unlock(); |
1da177e4 LT |
2870 | } |
2871 | ||
2872 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2873 | { | |
2874 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2875 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2876 | ||
2877 | if (v == SEQ_START_TOKEN) { | |
1744bea1 | 2878 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
1da177e4 LT |
2879 | } else { |
2880 | seq_printf(seq, | |
2881 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2882 | "0x%08x %6lu %6lu\n", |
2883 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2884 | ntohl(state->im->multiaddr), |
2885 | ntohl(psf->sf_inaddr), | |
2886 | psf->sf_count[MCAST_INCLUDE], | |
2887 | psf->sf_count[MCAST_EXCLUDE]); | |
2888 | } | |
2889 | return 0; | |
2890 | } | |
2891 | ||
f690808e | 2892 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2893 | .start = igmp_mcf_seq_start, |
2894 | .next = igmp_mcf_seq_next, | |
2895 | .stop = igmp_mcf_seq_stop, | |
2896 | .show = igmp_mcf_seq_show, | |
2897 | }; | |
2898 | ||
2899 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2900 | { | |
7091e728 | 2901 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2902 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2903 | } |
2904 | ||
9a32144e | 2905 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2906 | .owner = THIS_MODULE, |
2907 | .open = igmp_mcf_seq_open, | |
2908 | .read = seq_read, | |
2909 | .llseek = seq_lseek, | |
7091e728 | 2910 | .release = seq_release_net, |
1da177e4 LT |
2911 | }; |
2912 | ||
2c8c1e72 | 2913 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2914 | { |
7091e728 | 2915 | struct proc_dir_entry *pde; |
93a714d6 | 2916 | int err; |
7091e728 | 2917 | |
d4beaa66 | 2918 | pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); |
7091e728 AD |
2919 | if (!pde) |
2920 | goto out_igmp; | |
d4beaa66 G |
2921 | pde = proc_create("mcfilter", S_IRUGO, net->proc_net, |
2922 | &igmp_mcf_seq_fops); | |
7091e728 AD |
2923 | if (!pde) |
2924 | goto out_mcfilter; | |
93a714d6 MC |
2925 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
2926 | SOCK_DGRAM, 0, net); | |
2927 | if (err < 0) { | |
2928 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
2929 | err); | |
2930 | goto out_sock; | |
2931 | } | |
2932 | ||
dcd87999 NB |
2933 | /* Sysctl initialization */ |
2934 | net->ipv4.sysctl_igmp_max_memberships = 20; | |
2935 | net->ipv4.sysctl_igmp_max_msf = 10; | |
2936 | /* IGMP reports for link-local multicast groups are enabled by default */ | |
2937 | net->ipv4.sysctl_igmp_llm_reports = 1; | |
2938 | net->ipv4.sysctl_igmp_qrv = 2; | |
1da177e4 | 2939 | return 0; |
7091e728 | 2940 | |
93a714d6 MC |
2941 | out_sock: |
2942 | remove_proc_entry("mcfilter", net->proc_net); | |
7091e728 | 2943 | out_mcfilter: |
ece31ffd | 2944 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
2945 | out_igmp: |
2946 | return -ENOMEM; | |
2947 | } | |
2948 | ||
2c8c1e72 | 2949 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 2950 | { |
ece31ffd G |
2951 | remove_proc_entry("mcfilter", net->proc_net); |
2952 | remove_proc_entry("igmp", net->proc_net); | |
93a714d6 | 2953 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
7091e728 AD |
2954 | } |
2955 | ||
2956 | static struct pernet_operations igmp_net_ops = { | |
2957 | .init = igmp_net_init, | |
2958 | .exit = igmp_net_exit, | |
2959 | }; | |
72c1d3bd | 2960 | #endif |
7091e728 | 2961 | |
4aa5dee4 JP |
2962 | static int igmp_netdev_event(struct notifier_block *this, |
2963 | unsigned long event, void *ptr) | |
2964 | { | |
2965 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
2966 | struct in_device *in_dev; | |
2967 | ||
2968 | switch (event) { | |
2969 | case NETDEV_RESEND_IGMP: | |
2970 | in_dev = __in_dev_get_rtnl(dev); | |
2971 | if (in_dev) | |
2972 | ip_mc_rejoin_groups(in_dev); | |
2973 | break; | |
2974 | default: | |
2975 | break; | |
2976 | } | |
2977 | return NOTIFY_DONE; | |
2978 | } | |
2979 | ||
2980 | static struct notifier_block igmp_notifier = { | |
2981 | .notifier_call = igmp_netdev_event, | |
2982 | }; | |
2983 | ||
72c1d3bd | 2984 | int __init igmp_mc_init(void) |
7091e728 | 2985 | { |
72c1d3bd | 2986 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
2987 | int err; |
2988 | ||
2989 | err = register_pernet_subsys(&igmp_net_ops); | |
2990 | if (err) | |
2991 | return err; | |
2992 | err = register_netdevice_notifier(&igmp_notifier); | |
2993 | if (err) | |
2994 | goto reg_notif_fail; | |
2995 | return 0; | |
2996 | ||
2997 | reg_notif_fail: | |
2998 | unregister_pernet_subsys(&igmp_net_ops); | |
2999 | return err; | |
72c1d3bd WC |
3000 | #else |
3001 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 3002 | #endif |
72c1d3bd | 3003 | } |