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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
7c0f6ba6 | 75 | #include <linux/uaccess.h> |
1da177e4 LT |
76 | #include <linux/types.h> |
77 | #include <linux/kernel.h> | |
78 | #include <linux/jiffies.h> | |
79 | #include <linux/string.h> | |
80 | #include <linux/socket.h> | |
81 | #include <linux/sockios.h> | |
82 | #include <linux/in.h> | |
83 | #include <linux/inet.h> | |
84 | #include <linux/netdevice.h> | |
85 | #include <linux/skbuff.h> | |
86 | #include <linux/inetdevice.h> | |
87 | #include <linux/igmp.h> | |
88 | #include <linux/if_arp.h> | |
89 | #include <linux/rtnetlink.h> | |
90 | #include <linux/times.h> | |
9d4a0314 | 91 | #include <linux/pkt_sched.h> |
a46182b0 | 92 | #include <linux/byteorder/generic.h> |
14c85021 | 93 | |
457c4cbc | 94 | #include <net/net_namespace.h> |
14c85021 | 95 | #include <net/arp.h> |
1da177e4 LT |
96 | #include <net/ip.h> |
97 | #include <net/protocol.h> | |
98 | #include <net/route.h> | |
99 | #include <net/sock.h> | |
100 | #include <net/checksum.h> | |
93a714d6 | 101 | #include <net/inet_common.h> |
1da177e4 LT |
102 | #include <linux/netfilter_ipv4.h> |
103 | #ifdef CONFIG_IP_MROUTE | |
104 | #include <linux/mroute.h> | |
105 | #endif | |
106 | #ifdef CONFIG_PROC_FS | |
107 | #include <linux/proc_fs.h> | |
108 | #include <linux/seq_file.h> | |
109 | #endif | |
110 | ||
1da177e4 LT |
111 | #ifdef CONFIG_IP_MULTICAST |
112 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
113 | ||
436f7c20 FF |
114 | #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) |
115 | #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) | |
5b43d912 | 116 | #define IGMP_QUERY_INTERVAL (125*HZ) |
436f7c20 | 117 | #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) |
1da177e4 | 118 | |
436f7c20 | 119 | #define IGMP_INITIAL_REPORT_DELAY (1) |
1da177e4 | 120 | |
436f7c20 | 121 | /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! |
1da177e4 LT |
122 | * IGMP specs require to report membership immediately after |
123 | * joining a group, but we delay the first report by a | |
124 | * small interval. It seems more natural and still does not | |
125 | * contradict to specs provided this delay is small enough. | |
126 | */ | |
127 | ||
42f811b8 | 128 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 129 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
130 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
131 | ((in_dev)->mr_v1_seen && \ | |
132 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
133 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 134 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
135 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
136 | ((in_dev)->mr_v2_seen && \ | |
137 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 | 138 | |
cab70040 WM |
139 | static int unsolicited_report_interval(struct in_device *in_dev) |
140 | { | |
2690048c WM |
141 | int interval_ms, interval_jiffies; |
142 | ||
cab70040 | 143 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
2690048c WM |
144 | interval_ms = IN_DEV_CONF_GET( |
145 | in_dev, | |
146 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
cab70040 | 147 | else /* v3 */ |
2690048c WM |
148 | interval_ms = IN_DEV_CONF_GET( |
149 | in_dev, | |
150 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
151 | ||
152 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
153 | ||
154 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
155 | * we always return a positive value. | |
156 | */ | |
157 | if (interval_jiffies <= 0) | |
158 | interval_jiffies = 1; | |
159 | return interval_jiffies; | |
cab70040 WM |
160 | } |
161 | ||
1da177e4 | 162 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
24803f38 | 163 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
1da177e4 LT |
164 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
165 | static int sf_setstate(struct ip_mc_list *pmc); | |
166 | static void sf_markstate(struct ip_mc_list *pmc); | |
167 | #endif | |
168 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
169 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
170 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
171 | |
172 | static void ip_ma_put(struct ip_mc_list *im) | |
173 | { | |
8851ab52 | 174 | if (refcount_dec_and_test(&im->refcnt)) { |
1da177e4 | 175 | in_dev_put(im->interface); |
42ea299d | 176 | kfree_rcu(im, rcu); |
1da177e4 LT |
177 | } |
178 | } | |
179 | ||
d9aa9380 DM |
180 | #define for_each_pmc_rcu(in_dev, pmc) \ |
181 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
182 | pmc != NULL; \ | |
183 | pmc = rcu_dereference(pmc->next_rcu)) | |
184 | ||
185 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
186 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
187 | pmc != NULL; \ | |
188 | pmc = rtnl_dereference(pmc->next_rcu)) | |
189 | ||
8019540e ED |
190 | static void ip_sf_list_clear_all(struct ip_sf_list *psf) |
191 | { | |
192 | struct ip_sf_list *next; | |
193 | ||
194 | while (psf) { | |
195 | next = psf->sf_next; | |
196 | kfree(psf); | |
197 | psf = next; | |
198 | } | |
199 | } | |
200 | ||
1da177e4 LT |
201 | #ifdef CONFIG_IP_MULTICAST |
202 | ||
203 | /* | |
204 | * Timer management | |
205 | */ | |
206 | ||
1d7138de | 207 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
208 | { |
209 | spin_lock_bh(&im->lock); | |
210 | if (del_timer(&im->timer)) | |
8851ab52 | 211 | refcount_dec(&im->refcnt); |
a7e9ff73 | 212 | im->tm_running = 0; |
1da177e4 LT |
213 | im->reporter = 0; |
214 | im->unsolicit_count = 0; | |
215 | spin_unlock_bh(&im->lock); | |
216 | } | |
217 | ||
218 | /* It must be called with locked im->lock */ | |
219 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
220 | { | |
63862b5b | 221 | int tv = prandom_u32() % max_delay; |
1da177e4 | 222 | |
a7e9ff73 | 223 | im->tm_running = 1; |
1da177e4 | 224 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
8851ab52 | 225 | refcount_inc(&im->refcnt); |
1da177e4 LT |
226 | } |
227 | ||
228 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
229 | { | |
63862b5b | 230 | int tv = prandom_u32() % in_dev->mr_maxdelay; |
7ababb78 MT |
231 | unsigned long exp = jiffies + tv + 2; |
232 | ||
233 | if (in_dev->mr_gq_running && | |
234 | time_after_eq(exp, (in_dev->mr_gq_timer).expires)) | |
235 | return; | |
1da177e4 LT |
236 | |
237 | in_dev->mr_gq_running = 1; | |
7ababb78 | 238 | if (!mod_timer(&in_dev->mr_gq_timer, exp)) |
1da177e4 LT |
239 | in_dev_hold(in_dev); |
240 | } | |
241 | ||
242 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
243 | { | |
63862b5b | 244 | int tv = prandom_u32() % delay; |
1da177e4 LT |
245 | |
246 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
247 | in_dev_hold(in_dev); | |
248 | } | |
249 | ||
250 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
251 | { | |
252 | spin_lock_bh(&im->lock); | |
253 | im->unsolicit_count = 0; | |
254 | if (del_timer(&im->timer)) { | |
255 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
256 | add_timer(&im->timer); | |
a7e9ff73 | 257 | im->tm_running = 1; |
1da177e4 LT |
258 | spin_unlock_bh(&im->lock); |
259 | return; | |
260 | } | |
8851ab52 | 261 | refcount_dec(&im->refcnt); |
1da177e4 LT |
262 | } |
263 | igmp_start_timer(im, max_delay); | |
264 | spin_unlock_bh(&im->lock); | |
265 | } | |
266 | ||
267 | ||
268 | /* | |
269 | * Send an IGMP report. | |
270 | */ | |
271 | ||
272 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
273 | ||
274 | ||
275 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
276 | int gdeleted, int sdeleted) | |
277 | { | |
278 | switch (type) { | |
279 | case IGMPV3_MODE_IS_INCLUDE: | |
280 | case IGMPV3_MODE_IS_EXCLUDE: | |
281 | if (gdeleted || sdeleted) | |
282 | return 0; | |
ad12583f DS |
283 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
284 | if (pmc->sfmode == MCAST_INCLUDE) | |
285 | return 1; | |
286 | /* don't include if this source is excluded | |
287 | * in all filters | |
288 | */ | |
289 | if (psf->sf_count[MCAST_INCLUDE]) | |
290 | return type == IGMPV3_MODE_IS_INCLUDE; | |
291 | return pmc->sfcount[MCAST_EXCLUDE] == | |
292 | psf->sf_count[MCAST_EXCLUDE]; | |
293 | } | |
294 | return 0; | |
1da177e4 LT |
295 | case IGMPV3_CHANGE_TO_INCLUDE: |
296 | if (gdeleted || sdeleted) | |
297 | return 0; | |
298 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
299 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
300 | if (gdeleted || sdeleted) | |
301 | return 0; | |
302 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
303 | psf->sf_count[MCAST_INCLUDE]) | |
304 | return 0; | |
305 | return pmc->sfcount[MCAST_EXCLUDE] == | |
306 | psf->sf_count[MCAST_EXCLUDE]; | |
307 | case IGMPV3_ALLOW_NEW_SOURCES: | |
308 | if (gdeleted || !psf->sf_crcount) | |
309 | return 0; | |
310 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
311 | case IGMPV3_BLOCK_OLD_SOURCES: | |
312 | if (pmc->sfmode == MCAST_INCLUDE) | |
313 | return gdeleted || (psf->sf_crcount && sdeleted); | |
314 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
315 | } | |
316 | return 0; | |
317 | } | |
318 | ||
319 | static int | |
320 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
321 | { | |
322 | struct ip_sf_list *psf; | |
323 | int scount = 0; | |
324 | ||
c71151f0 | 325 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
326 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
327 | continue; | |
328 | scount++; | |
329 | } | |
330 | return scount; | |
331 | } | |
332 | ||
a46182b0 KC |
333 | /* source address selection per RFC 3376 section 4.2.13 */ |
334 | static __be32 igmpv3_get_srcaddr(struct net_device *dev, | |
335 | const struct flowi4 *fl4) | |
336 | { | |
337 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
338 | ||
339 | if (!in_dev) | |
340 | return htonl(INADDR_ANY); | |
341 | ||
342 | for_ifa(in_dev) { | |
ad23b750 | 343 | if (fl4->saddr == ifa->ifa_local) |
a46182b0 KC |
344 | return fl4->saddr; |
345 | } endfor_ifa(in_dev); | |
346 | ||
347 | return htonl(INADDR_ANY); | |
348 | } | |
349 | ||
4c672e4b | 350 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
1da177e4 LT |
351 | { |
352 | struct sk_buff *skb; | |
353 | struct rtable *rt; | |
354 | struct iphdr *pip; | |
355 | struct igmpv3_report *pig; | |
877acedc | 356 | struct net *net = dev_net(dev); |
31e4543d | 357 | struct flowi4 fl4; |
66088243 HX |
358 | int hlen = LL_RESERVED_SPACE(dev); |
359 | int tlen = dev->needed_tailroom; | |
4c672e4b | 360 | unsigned int size = mtu; |
1da177e4 | 361 | |
57e1ab6e | 362 | while (1) { |
66088243 | 363 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
364 | GFP_ATOMIC | __GFP_NOWARN); |
365 | if (skb) | |
366 | break; | |
367 | size >>= 1; | |
368 | if (size < 256) | |
369 | return NULL; | |
370 | } | |
9d4a0314 | 371 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 372 | |
31e4543d | 373 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
374 | 0, 0, |
375 | IPPROTO_IGMP, 0, dev->ifindex); | |
376 | if (IS_ERR(rt)) { | |
377 | kfree_skb(skb); | |
378 | return NULL; | |
1da177e4 | 379 | } |
1da177e4 | 380 | |
d8d1f30b | 381 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
382 | skb->dev = dev; |
383 | ||
66088243 | 384 | skb_reserve(skb, hlen); |
1837b2e2 | 385 | skb_tailroom_reserve(skb, mtu, tlen); |
1da177e4 | 386 | |
7e28ecc2 | 387 | skb_reset_network_header(skb); |
eddc9ec5 | 388 | pip = ip_hdr(skb); |
7e28ecc2 | 389 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
390 | |
391 | pip->version = 4; | |
392 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
393 | pip->tos = 0xc0; | |
394 | pip->frag_off = htons(IP_DF); | |
395 | pip->ttl = 1; | |
492f64ce | 396 | pip->daddr = fl4.daddr; |
3b4724de ED |
397 | |
398 | rcu_read_lock(); | |
a46182b0 | 399 | pip->saddr = igmpv3_get_srcaddr(dev, &fl4); |
3b4724de ED |
400 | rcu_read_unlock(); |
401 | ||
1da177e4 LT |
402 | pip->protocol = IPPROTO_IGMP; |
403 | pip->tot_len = 0; /* filled in later */ | |
b6a7719a | 404 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
405 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
406 | ((u8 *)&pip[1])[1] = 4; | |
407 | ((u8 *)&pip[1])[2] = 0; | |
408 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 409 | |
b0e380b1 | 410 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 411 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 412 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
413 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
414 | pig->resv1 = 0; | |
415 | pig->csum = 0; | |
416 | pig->resv2 = 0; | |
417 | pig->ngrec = 0; | |
418 | return skb; | |
419 | } | |
420 | ||
421 | static int igmpv3_sendpack(struct sk_buff *skb) | |
422 | { | |
d9edf9e2 | 423 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 424 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 425 | |
d9edf9e2 | 426 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 427 | |
33224b16 | 428 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
1da177e4 LT |
429 | } |
430 | ||
431 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
432 | { | |
a7e9ff73 | 433 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
434 | } |
435 | ||
436 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
b5476022 | 437 | int type, struct igmpv3_grec **ppgr, unsigned int mtu) |
1da177e4 LT |
438 | { |
439 | struct net_device *dev = pmc->interface->dev; | |
440 | struct igmpv3_report *pih; | |
441 | struct igmpv3_grec *pgr; | |
442 | ||
b5476022 ED |
443 | if (!skb) { |
444 | skb = igmpv3_newpack(dev, mtu); | |
445 | if (!skb) | |
446 | return NULL; | |
447 | } | |
4df864c1 | 448 | pgr = skb_put(skb, sizeof(struct igmpv3_grec)); |
1da177e4 LT |
449 | pgr->grec_type = type; |
450 | pgr->grec_auxwords = 0; | |
451 | pgr->grec_nsrcs = 0; | |
452 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 453 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
454 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
455 | *ppgr = pgr; | |
456 | return skb; | |
457 | } | |
458 | ||
4c672e4b | 459 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
460 | |
461 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
462 | int type, int gdeleted, int sdeleted) | |
463 | { | |
464 | struct net_device *dev = pmc->interface->dev; | |
87a8a2ae | 465 | struct net *net = dev_net(dev); |
1da177e4 LT |
466 | struct igmpv3_report *pih; |
467 | struct igmpv3_grec *pgr = NULL; | |
468 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 469 | int scount, stotal, first, isquery, truncate; |
b5476022 | 470 | unsigned int mtu; |
1da177e4 LT |
471 | |
472 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
473 | return skb; | |
87a8a2ae | 474 | if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 475 | return skb; |
1da177e4 | 476 | |
b5476022 ED |
477 | mtu = READ_ONCE(dev->mtu); |
478 | if (mtu < IPV4_MIN_MTU) | |
479 | return skb; | |
480 | ||
1da177e4 LT |
481 | isquery = type == IGMPV3_MODE_IS_INCLUDE || |
482 | type == IGMPV3_MODE_IS_EXCLUDE; | |
483 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
484 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
485 | ||
ad12583f DS |
486 | stotal = scount = 0; |
487 | ||
1da177e4 LT |
488 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
489 | ||
ad12583f DS |
490 | if (!*psf_list) |
491 | goto empty_source; | |
492 | ||
d9edf9e2 | 493 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
494 | |
495 | /* EX and TO_EX get a fresh packet, if needed */ | |
496 | if (truncate) { | |
497 | if (pih && pih->ngrec && | |
498 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
499 | if (skb) | |
500 | igmpv3_sendpack(skb); | |
b5476022 | 501 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
502 | } |
503 | } | |
504 | first = 1; | |
1da177e4 | 505 | psf_prev = NULL; |
c71151f0 | 506 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 507 | __be32 *psrc; |
1da177e4 LT |
508 | |
509 | psf_next = psf->sf_next; | |
510 | ||
511 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
512 | psf_prev = psf; | |
513 | continue; | |
514 | } | |
515 | ||
a052517a HL |
516 | /* Based on RFC3376 5.1. Should not send source-list change |
517 | * records when there is a filter mode change. | |
518 | */ | |
519 | if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || | |
520 | (!gdeleted && pmc->crcount)) && | |
521 | (type == IGMPV3_ALLOW_NEW_SOURCES || | |
522 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) | |
523 | goto decrease_sf_crcount; | |
524 | ||
1da177e4 LT |
525 | /* clear marks on query responses */ |
526 | if (isquery) | |
527 | psf->sf_gsresp = 0; | |
528 | ||
63007727 | 529 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
530 | first*sizeof(struct igmpv3_grec)) { |
531 | if (truncate && !first) | |
532 | break; /* truncate these */ | |
533 | if (pgr) | |
534 | pgr->grec_nsrcs = htons(scount); | |
535 | if (skb) | |
536 | igmpv3_sendpack(skb); | |
b5476022 | 537 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
538 | first = 1; |
539 | scount = 0; | |
540 | } | |
541 | if (first) { | |
b5476022 | 542 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
1da177e4 LT |
543 | first = 0; |
544 | } | |
cc63f70b AD |
545 | if (!skb) |
546 | return NULL; | |
4df864c1 | 547 | psrc = skb_put(skb, sizeof(__be32)); |
1da177e4 | 548 | *psrc = psf->sf_inaddr; |
ad12583f | 549 | scount++; stotal++; |
1da177e4 LT |
550 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
551 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
a052517a | 552 | decrease_sf_crcount: |
1da177e4 LT |
553 | psf->sf_crcount--; |
554 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
555 | if (psf_prev) | |
556 | psf_prev->sf_next = psf->sf_next; | |
557 | else | |
558 | *psf_list = psf->sf_next; | |
559 | kfree(psf); | |
560 | continue; | |
561 | } | |
562 | } | |
563 | psf_prev = psf; | |
564 | } | |
ad12583f DS |
565 | |
566 | empty_source: | |
567 | if (!stotal) { | |
568 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
569 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
570 | return skb; | |
571 | if (pmc->crcount || isquery) { | |
572 | /* make sure we have room for group header */ | |
c71151f0 | 573 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
574 | igmpv3_sendpack(skb); |
575 | skb = NULL; /* add_grhead will get a new one */ | |
576 | } | |
b5476022 | 577 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
ad12583f DS |
578 | } |
579 | } | |
1da177e4 LT |
580 | if (pgr) |
581 | pgr->grec_nsrcs = htons(scount); | |
582 | ||
583 | if (isquery) | |
584 | pmc->gsquery = 0; /* clear query state on report */ | |
585 | return skb; | |
586 | } | |
587 | ||
588 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
589 | { | |
590 | struct sk_buff *skb = NULL; | |
87a8a2ae | 591 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
592 | int type; |
593 | ||
594 | if (!pmc) { | |
1d7138de ED |
595 | rcu_read_lock(); |
596 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
597 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
598 | continue; | |
df2cf4a7 | 599 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
87a8a2ae | 600 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 601 | continue; |
1da177e4 LT |
602 | spin_lock_bh(&pmc->lock); |
603 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
604 | type = IGMPV3_MODE_IS_EXCLUDE; | |
605 | else | |
606 | type = IGMPV3_MODE_IS_INCLUDE; | |
607 | skb = add_grec(skb, pmc, type, 0, 0); | |
608 | spin_unlock_bh(&pmc->lock); | |
609 | } | |
1d7138de | 610 | rcu_read_unlock(); |
1da177e4 LT |
611 | } else { |
612 | spin_lock_bh(&pmc->lock); | |
613 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
614 | type = IGMPV3_MODE_IS_EXCLUDE; | |
615 | else | |
616 | type = IGMPV3_MODE_IS_INCLUDE; | |
617 | skb = add_grec(skb, pmc, type, 0, 0); | |
618 | spin_unlock_bh(&pmc->lock); | |
619 | } | |
620 | if (!skb) | |
621 | return 0; | |
622 | return igmpv3_sendpack(skb); | |
623 | } | |
624 | ||
625 | /* | |
626 | * remove zero-count source records from a source filter list | |
627 | */ | |
628 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
629 | { | |
630 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
631 | ||
632 | psf_prev = NULL; | |
c71151f0 | 633 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
634 | psf_next = psf->sf_next; |
635 | if (psf->sf_crcount == 0) { | |
636 | if (psf_prev) | |
637 | psf_prev->sf_next = psf->sf_next; | |
638 | else | |
639 | *ppsf = psf->sf_next; | |
640 | kfree(psf); | |
641 | } else | |
642 | psf_prev = psf; | |
643 | } | |
644 | } | |
645 | ||
780fdb71 ED |
646 | static void kfree_pmc(struct ip_mc_list *pmc) |
647 | { | |
648 | ip_sf_list_clear_all(pmc->sources); | |
649 | ip_sf_list_clear_all(pmc->tomb); | |
650 | kfree(pmc); | |
651 | } | |
652 | ||
1da177e4 LT |
653 | static void igmpv3_send_cr(struct in_device *in_dev) |
654 | { | |
655 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
656 | struct sk_buff *skb = NULL; | |
657 | int type, dtype; | |
658 | ||
1d7138de | 659 | rcu_read_lock(); |
1da177e4 LT |
660 | spin_lock_bh(&in_dev->mc_tomb_lock); |
661 | ||
662 | /* deleted MCA's */ | |
663 | pmc_prev = NULL; | |
c71151f0 | 664 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
665 | pmc_next = pmc->next; |
666 | if (pmc->sfmode == MCAST_INCLUDE) { | |
667 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
668 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
669 | skb = add_grec(skb, pmc, type, 1, 0); | |
670 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
671 | } | |
672 | if (pmc->crcount) { | |
1da177e4 LT |
673 | if (pmc->sfmode == MCAST_EXCLUDE) { |
674 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
675 | skb = add_grec(skb, pmc, type, 1, 0); | |
676 | } | |
ad12583f | 677 | pmc->crcount--; |
1da177e4 LT |
678 | if (pmc->crcount == 0) { |
679 | igmpv3_clear_zeros(&pmc->tomb); | |
680 | igmpv3_clear_zeros(&pmc->sources); | |
681 | } | |
682 | } | |
683 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
684 | if (pmc_prev) | |
685 | pmc_prev->next = pmc_next; | |
686 | else | |
687 | in_dev->mc_tomb = pmc_next; | |
688 | in_dev_put(pmc->interface); | |
780fdb71 | 689 | kfree_pmc(pmc); |
1da177e4 LT |
690 | } else |
691 | pmc_prev = pmc; | |
692 | } | |
693 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
694 | ||
695 | /* change recs */ | |
1d7138de | 696 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
697 | spin_lock_bh(&pmc->lock); |
698 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
699 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
700 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
701 | } else { | |
702 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
703 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
704 | } | |
705 | skb = add_grec(skb, pmc, type, 0, 0); | |
706 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
707 | ||
708 | /* filter mode changes */ | |
709 | if (pmc->crcount) { | |
1da177e4 LT |
710 | if (pmc->sfmode == MCAST_EXCLUDE) |
711 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
712 | else | |
713 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
714 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 715 | pmc->crcount--; |
1da177e4 LT |
716 | } |
717 | spin_unlock_bh(&pmc->lock); | |
718 | } | |
1d7138de | 719 | rcu_read_unlock(); |
1da177e4 LT |
720 | |
721 | if (!skb) | |
722 | return; | |
723 | (void) igmpv3_sendpack(skb); | |
724 | } | |
725 | ||
726 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
727 | int type) | |
728 | { | |
729 | struct sk_buff *skb; | |
730 | struct iphdr *iph; | |
731 | struct igmphdr *ih; | |
732 | struct rtable *rt; | |
733 | struct net_device *dev = in_dev->dev; | |
877acedc | 734 | struct net *net = dev_net(dev); |
63007727 | 735 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 736 | struct flowi4 fl4; |
63007727 | 737 | __be32 dst; |
66088243 | 738 | int hlen, tlen; |
1da177e4 LT |
739 | |
740 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
741 | return igmpv3_send_report(in_dev, pmc); | |
df2cf4a7 | 742 | |
87a8a2ae | 743 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 PD |
744 | return 0; |
745 | ||
746 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
1da177e4 LT |
747 | dst = IGMP_ALL_ROUTER; |
748 | else | |
749 | dst = group; | |
750 | ||
31e4543d | 751 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
752 | 0, 0, |
753 | IPPROTO_IGMP, 0, dev->ifindex); | |
754 | if (IS_ERR(rt)) | |
755 | return -1; | |
756 | ||
66088243 HX |
757 | hlen = LL_RESERVED_SPACE(dev); |
758 | tlen = dev->needed_tailroom; | |
759 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
51456b29 | 760 | if (!skb) { |
1da177e4 LT |
761 | ip_rt_put(rt); |
762 | return -1; | |
763 | } | |
9d4a0314 | 764 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 765 | |
d8d1f30b | 766 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 767 | |
66088243 | 768 | skb_reserve(skb, hlen); |
1da177e4 | 769 | |
7e28ecc2 | 770 | skb_reset_network_header(skb); |
eddc9ec5 | 771 | iph = ip_hdr(skb); |
7e28ecc2 | 772 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
773 | |
774 | iph->version = 4; | |
775 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
776 | iph->tos = 0xc0; | |
777 | iph->frag_off = htons(IP_DF); | |
778 | iph->ttl = 1; | |
779 | iph->daddr = dst; | |
492f64ce | 780 | iph->saddr = fl4.saddr; |
1da177e4 | 781 | iph->protocol = IPPROTO_IGMP; |
b6a7719a | 782 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
783 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
784 | ((u8 *)&iph[1])[1] = 4; | |
785 | ((u8 *)&iph[1])[2] = 0; | |
786 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 | 787 | |
4df864c1 | 788 | ih = skb_put(skb, sizeof(struct igmphdr)); |
a7e9ff73 JK |
789 | ih->type = type; |
790 | ih->code = 0; | |
791 | ih->csum = 0; | |
792 | ih->group = group; | |
793 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 794 | |
33224b16 | 795 | return ip_local_out(net, skb->sk, skb); |
1da177e4 LT |
796 | } |
797 | ||
e99e88a9 | 798 | static void igmp_gq_timer_expire(struct timer_list *t) |
1da177e4 | 799 | { |
e99e88a9 | 800 | struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer); |
1da177e4 LT |
801 | |
802 | in_dev->mr_gq_running = 0; | |
803 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 804 | in_dev_put(in_dev); |
1da177e4 LT |
805 | } |
806 | ||
e99e88a9 | 807 | static void igmp_ifc_timer_expire(struct timer_list *t) |
1da177e4 | 808 | { |
e99e88a9 | 809 | struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer); |
1da177e4 LT |
810 | |
811 | igmpv3_send_cr(in_dev); | |
812 | if (in_dev->mr_ifc_count) { | |
813 | in_dev->mr_ifc_count--; | |
cab70040 WM |
814 | igmp_ifc_start_timer(in_dev, |
815 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 816 | } |
e2401654 | 817 | in_dev_put(in_dev); |
1da177e4 LT |
818 | } |
819 | ||
820 | static void igmp_ifc_event(struct in_device *in_dev) | |
821 | { | |
165094af | 822 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
823 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
824 | return; | |
165094af | 825 | in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
826 | igmp_ifc_start_timer(in_dev, 1); |
827 | } | |
828 | ||
829 | ||
e99e88a9 | 830 | static void igmp_timer_expire(struct timer_list *t) |
1da177e4 | 831 | { |
e99e88a9 | 832 | struct ip_mc_list *im = from_timer(im, t, timer); |
1da177e4 LT |
833 | struct in_device *in_dev = im->interface; |
834 | ||
835 | spin_lock(&im->lock); | |
a7e9ff73 | 836 | im->tm_running = 0; |
1da177e4 LT |
837 | |
838 | if (im->unsolicit_count) { | |
839 | im->unsolicit_count--; | |
cab70040 | 840 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
1da177e4 LT |
841 | } |
842 | im->reporter = 1; | |
843 | spin_unlock(&im->lock); | |
844 | ||
845 | if (IGMP_V1_SEEN(in_dev)) | |
846 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
847 | else if (IGMP_V2_SEEN(in_dev)) | |
848 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
849 | else | |
850 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
851 | ||
852 | ip_ma_put(im); | |
853 | } | |
854 | ||
ad12583f | 855 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 856 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
857 | { |
858 | struct ip_sf_list *psf; | |
859 | int i, scount; | |
860 | ||
ad12583f | 861 | scount = 0; |
c71151f0 | 862 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
863 | if (scount == nsrcs) |
864 | break; | |
c71151f0 | 865 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 866 | /* skip inactive filters */ |
e05c4ad3 | 867 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
868 | pmc->sfcount[MCAST_EXCLUDE] != |
869 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 870 | break; |
ad12583f DS |
871 | if (srcs[i] == psf->sf_inaddr) { |
872 | scount++; | |
873 | break; | |
874 | } | |
875 | } | |
876 | } | |
877 | pmc->gsquery = 0; | |
878 | if (scount == nsrcs) /* all sources excluded */ | |
879 | return 0; | |
880 | return 1; | |
881 | } | |
882 | ||
ea4d9e72 | 883 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
884 | { |
885 | struct ip_sf_list *psf; | |
886 | int i, scount; | |
887 | ||
888 | if (pmc->sfmode == MCAST_EXCLUDE) | |
889 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
890 | ||
891 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 892 | scount = 0; |
c71151f0 | 893 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
894 | if (scount == nsrcs) |
895 | break; | |
c71151f0 | 896 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
897 | if (srcs[i] == psf->sf_inaddr) { |
898 | psf->sf_gsresp = 1; | |
899 | scount++; | |
900 | break; | |
901 | } | |
902 | } | |
ad12583f DS |
903 | if (!scount) { |
904 | pmc->gsquery = 0; | |
905 | return 0; | |
906 | } | |
907 | pmc->gsquery = 1; | |
908 | return 1; | |
1da177e4 LT |
909 | } |
910 | ||
d679c532 ED |
911 | /* return true if packet was dropped */ |
912 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
913 | { |
914 | struct ip_mc_list *im; | |
87a8a2ae | 915 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
916 | |
917 | /* Timers are only set for non-local groups */ | |
918 | ||
919 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 920 | return false; |
87a8a2ae | 921 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 922 | return false; |
1da177e4 | 923 | |
1d7138de ED |
924 | rcu_read_lock(); |
925 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
926 | if (im->multiaddr == group) { |
927 | igmp_stop_timer(im); | |
928 | break; | |
929 | } | |
930 | } | |
1d7138de | 931 | rcu_read_unlock(); |
d679c532 | 932 | return false; |
1da177e4 LT |
933 | } |
934 | ||
d679c532 ED |
935 | /* return true if packet was dropped */ |
936 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
937 | int len) |
938 | { | |
d9edf9e2 ACM |
939 | struct igmphdr *ih = igmp_hdr(skb); |
940 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 941 | struct ip_mc_list *im; |
63007727 | 942 | __be32 group = ih->group; |
1da177e4 LT |
943 | int max_delay; |
944 | int mark = 0; | |
87a8a2ae | 945 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
946 | |
947 | ||
5b7c8406 | 948 | if (len == 8) { |
1da177e4 LT |
949 | if (ih->code == 0) { |
950 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 951 | |
436f7c20 | 952 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
1da177e4 | 953 | in_dev->mr_v1_seen = jiffies + |
5b43d912 HL |
954 | (in_dev->mr_qrv * in_dev->mr_qi) + |
955 | in_dev->mr_qri; | |
1da177e4 LT |
956 | group = 0; |
957 | } else { | |
958 | /* v2 router present */ | |
959 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
960 | in_dev->mr_v2_seen = jiffies + | |
5b43d912 HL |
961 | (in_dev->mr_qrv * in_dev->mr_qi) + |
962 | in_dev->mr_qri; | |
1da177e4 LT |
963 | } |
964 | /* cancel the interface change timer */ | |
965 | in_dev->mr_ifc_count = 0; | |
966 | if (del_timer(&in_dev->mr_ifc_timer)) | |
967 | __in_dev_put(in_dev); | |
968 | /* clear deleted report items */ | |
969 | igmpv3_clear_delrec(in_dev); | |
970 | } else if (len < 12) { | |
d679c532 | 971 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
972 | } else if (IGMP_V1_SEEN(in_dev)) { |
973 | /* This is a v3 query with v1 queriers present */ | |
436f7c20 | 974 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
5b7c8406 DS |
975 | group = 0; |
976 | } else if (IGMP_V2_SEEN(in_dev)) { | |
977 | /* this is a v3 query with v2 queriers present; | |
978 | * Interpretation of the max_delay code is problematic here. | |
979 | * A real v2 host would use ih_code directly, while v3 has a | |
980 | * different encoding. We use the v3 encoding as more likely | |
981 | * to be intended in a v3 query. | |
982 | */ | |
983 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
984 | if (!max_delay) |
985 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
986 | } else { /* v3 */ |
987 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 988 | return true; |
e905a9ed | 989 | |
d9edf9e2 | 990 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 991 | if (ih3->nsrcs) { |
e905a9ed | 992 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 993 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 994 | return true; |
d9edf9e2 | 995 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
996 | } |
997 | ||
998 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
999 | if (!max_delay) | |
1000 | max_delay = 1; /* can't mod w/ 0 */ | |
1001 | in_dev->mr_maxdelay = max_delay; | |
5b43d912 HL |
1002 | |
1003 | /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently | |
1004 | * received value was zero, use the default or statically | |
1005 | * configured value. | |
1006 | */ | |
1007 | in_dev->mr_qrv = ih3->qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1008 | in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL; | |
1009 | ||
1010 | /* RFC3376, 8.3. Query Response Interval: | |
1011 | * The number of seconds represented by the [Query Response | |
1012 | * Interval] must be less than the [Query Interval]. | |
1013 | */ | |
1014 | if (in_dev->mr_qri >= in_dev->mr_qi) | |
1015 | in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ; | |
1016 | ||
1da177e4 LT |
1017 | if (!group) { /* general query */ |
1018 | if (ih3->nsrcs) | |
b47bd8d2 | 1019 | return true; /* no sources allowed */ |
1da177e4 | 1020 | igmp_gq_start_timer(in_dev); |
d679c532 | 1021 | return false; |
1da177e4 LT |
1022 | } |
1023 | /* mark sources to include, if group & source-specific */ | |
1024 | mark = ih3->nsrcs != 0; | |
1025 | } | |
1026 | ||
1027 | /* | |
1028 | * - Start the timers in all of our membership records | |
1029 | * that the query applies to for the interface on | |
1030 | * which the query arrived excl. those that belong | |
1031 | * to a "local" group (224.0.0.X) | |
1032 | * - For timers already running check if they need to | |
1033 | * be reset. | |
1034 | * - Use the igmp->igmp_code field as the maximum | |
1035 | * delay possible | |
1036 | */ | |
1d7138de ED |
1037 | rcu_read_lock(); |
1038 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
1039 | int changed; |
1040 | ||
1da177e4 LT |
1041 | if (group && group != im->multiaddr) |
1042 | continue; | |
1043 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1044 | continue; | |
df2cf4a7 | 1045 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1046 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1047 | continue; |
1da177e4 LT |
1048 | spin_lock_bh(&im->lock); |
1049 | if (im->tm_running) | |
1050 | im->gsquery = im->gsquery && mark; | |
1051 | else | |
1052 | im->gsquery = mark; | |
ad12583f | 1053 | changed = !im->gsquery || |
e905a9ed | 1054 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 1055 | spin_unlock_bh(&im->lock); |
ad12583f DS |
1056 | if (changed) |
1057 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 1058 | } |
1d7138de | 1059 | rcu_read_unlock(); |
d679c532 | 1060 | return false; |
1da177e4 LT |
1061 | } |
1062 | ||
9a57a9d2 | 1063 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
1064 | int igmp_rcv(struct sk_buff *skb) |
1065 | { | |
1066 | /* This basically follows the spec line by line -- see RFC1112 */ | |
1067 | struct igmphdr *ih; | |
c7b725be DA |
1068 | struct net_device *dev = skb->dev; |
1069 | struct in_device *in_dev; | |
1da177e4 | 1070 | int len = skb->len; |
d679c532 | 1071 | bool dropped = true; |
1da177e4 | 1072 | |
c7b725be DA |
1073 | if (netif_is_l3_master(dev)) { |
1074 | dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif); | |
1075 | if (!dev) | |
1076 | goto drop; | |
1077 | } | |
1078 | ||
1079 | in_dev = __in_dev_get_rcu(dev); | |
51456b29 | 1080 | if (!in_dev) |
cd557bc1 | 1081 | goto drop; |
1da177e4 | 1082 | |
fb286bb2 | 1083 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 1084 | goto drop; |
fb286bb2 | 1085 | |
de08dc1a TH |
1086 | if (skb_checksum_simple_validate(skb)) |
1087 | goto drop; | |
1da177e4 | 1088 | |
d9edf9e2 | 1089 | ih = igmp_hdr(skb); |
1da177e4 LT |
1090 | switch (ih->type) { |
1091 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 1092 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
1093 | break; |
1094 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1095 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 1096 | /* Is it our report looped back? */ |
c7537967 | 1097 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1098 | break; |
24c69275 DS |
1099 | /* don't rely on MC router hearing unicast reports */ |
1100 | if (skb->pkt_type == PACKET_MULTICAST || | |
1101 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1102 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1103 | break; |
1104 | case IGMP_PIM: | |
1105 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1106 | return pim_rcv_v1(skb); |
1107 | #endif | |
c6b471e6 | 1108 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1109 | case IGMP_DVMRP: |
1110 | case IGMP_TRACE: | |
1111 | case IGMP_HOST_LEAVE_MESSAGE: | |
1112 | case IGMP_MTRACE: | |
1113 | case IGMP_MTRACE_RESP: | |
1114 | break; | |
1115 | default: | |
dd1c1853 | 1116 | break; |
1da177e4 | 1117 | } |
fb286bb2 | 1118 | |
cd557bc1 | 1119 | drop: |
d679c532 ED |
1120 | if (dropped) |
1121 | kfree_skb(skb); | |
1122 | else | |
1123 | consume_skb(skb); | |
1da177e4 LT |
1124 | return 0; |
1125 | } | |
1126 | ||
1127 | #endif | |
1128 | ||
1129 | ||
1130 | /* | |
1131 | * Add a filter to a device | |
1132 | */ | |
1133 | ||
63007727 | 1134 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1135 | { |
1136 | char buf[MAX_ADDR_LEN]; | |
1137 | struct net_device *dev = in_dev->dev; | |
1138 | ||
1139 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1140 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1141 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1142 | routine. Something sort of: |
1143 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1144 | --ANK | |
1145 | */ | |
1146 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1147 | dev_mc_add(dev, buf); |
1da177e4 LT |
1148 | } |
1149 | ||
1150 | /* | |
1151 | * Remove a filter from a device | |
1152 | */ | |
1153 | ||
63007727 | 1154 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1155 | { |
1156 | char buf[MAX_ADDR_LEN]; | |
1157 | struct net_device *dev = in_dev->dev; | |
1158 | ||
1159 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1160 | dev_mc_del(dev, buf); |
1da177e4 LT |
1161 | } |
1162 | ||
1163 | #ifdef CONFIG_IP_MULTICAST | |
1164 | /* | |
1165 | * deleted ip_mc_list manipulation | |
1166 | */ | |
1167 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1168 | { | |
1169 | struct ip_mc_list *pmc; | |
165094af | 1170 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1171 | |
1172 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1173 | * are actually used. In particular, the refcnt and users are not | |
1174 | * used for management of the delete list. Using the same structure | |
1175 | * for deleted items allows change reports to use common code with | |
1176 | * non-deleted or query-response MCA's. | |
1177 | */ | |
0da974f4 | 1178 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1179 | if (!pmc) |
1180 | return; | |
b4846fc3 | 1181 | spin_lock_init(&pmc->lock); |
1da177e4 LT |
1182 | spin_lock_bh(&im->lock); |
1183 | pmc->interface = im->interface; | |
1184 | in_dev_hold(in_dev); | |
1185 | pmc->multiaddr = im->multiaddr; | |
165094af | 1186 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1187 | pmc->sfmode = im->sfmode; |
1188 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1189 | struct ip_sf_list *psf; | |
1190 | ||
1191 | pmc->tomb = im->tomb; | |
1192 | pmc->sources = im->sources; | |
1193 | im->tomb = im->sources = NULL; | |
c71151f0 | 1194 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1195 | psf->sf_crcount = pmc->crcount; |
1196 | } | |
1197 | spin_unlock_bh(&im->lock); | |
1198 | ||
1199 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1200 | pmc->next = in_dev->mc_tomb; | |
1201 | in_dev->mc_tomb = pmc; | |
1202 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1203 | } | |
1204 | ||
24803f38 HL |
1205 | /* |
1206 | * restore ip_mc_list deleted records | |
1207 | */ | |
1208 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1da177e4 LT |
1209 | { |
1210 | struct ip_mc_list *pmc, *pmc_prev; | |
24803f38 HL |
1211 | struct ip_sf_list *psf; |
1212 | struct net *net = dev_net(in_dev->dev); | |
1213 | __be32 multiaddr = im->multiaddr; | |
1da177e4 LT |
1214 | |
1215 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1216 | pmc_prev = NULL; | |
c71151f0 | 1217 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1218 | if (pmc->multiaddr == multiaddr) |
1219 | break; | |
1220 | pmc_prev = pmc; | |
1221 | } | |
1222 | if (pmc) { | |
1223 | if (pmc_prev) | |
1224 | pmc_prev->next = pmc->next; | |
1225 | else | |
1226 | in_dev->mc_tomb = pmc->next; | |
1227 | } | |
1228 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
24803f38 HL |
1229 | |
1230 | spin_lock_bh(&im->lock); | |
1da177e4 | 1231 | if (pmc) { |
24803f38 HL |
1232 | im->interface = pmc->interface; |
1233 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
732480cb | 1234 | if (im->sfmode == MCAST_INCLUDE) { |
a79e0f10 ED |
1235 | swap(im->tomb, pmc->tomb); |
1236 | swap(im->sources, pmc->sources); | |
24803f38 HL |
1237 | for (psf = im->sources; psf; psf = psf->sf_next) |
1238 | psf->sf_crcount = im->crcount; | |
1da177e4 LT |
1239 | } |
1240 | in_dev_put(pmc->interface); | |
780fdb71 | 1241 | kfree_pmc(pmc); |
1da177e4 | 1242 | } |
24803f38 | 1243 | spin_unlock_bh(&im->lock); |
1da177e4 LT |
1244 | } |
1245 | ||
24803f38 HL |
1246 | /* |
1247 | * flush ip_mc_list deleted records | |
1248 | */ | |
1da177e4 LT |
1249 | static void igmpv3_clear_delrec(struct in_device *in_dev) |
1250 | { | |
1251 | struct ip_mc_list *pmc, *nextpmc; | |
1252 | ||
1253 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1254 | pmc = in_dev->mc_tomb; | |
1255 | in_dev->mc_tomb = NULL; | |
1256 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1257 | ||
1258 | for (; pmc; pmc = nextpmc) { | |
1259 | nextpmc = pmc->next; | |
1260 | ip_mc_clear_src(pmc); | |
1261 | in_dev_put(pmc->interface); | |
780fdb71 | 1262 | kfree_pmc(pmc); |
1da177e4 LT |
1263 | } |
1264 | /* clear dead sources, too */ | |
1d7138de ED |
1265 | rcu_read_lock(); |
1266 | for_each_pmc_rcu(in_dev, pmc) { | |
780fdb71 | 1267 | struct ip_sf_list *psf; |
1da177e4 LT |
1268 | |
1269 | spin_lock_bh(&pmc->lock); | |
1270 | psf = pmc->tomb; | |
1271 | pmc->tomb = NULL; | |
1272 | spin_unlock_bh(&pmc->lock); | |
780fdb71 | 1273 | ip_sf_list_clear_all(psf); |
1da177e4 | 1274 | } |
1d7138de | 1275 | rcu_read_unlock(); |
1da177e4 LT |
1276 | } |
1277 | #endif | |
1278 | ||
1279 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1280 | { | |
1281 | struct in_device *in_dev = im->interface; | |
1282 | #ifdef CONFIG_IP_MULTICAST | |
87a8a2ae | 1283 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1284 | int reporter; |
1285 | #endif | |
1286 | ||
1287 | if (im->loaded) { | |
1288 | im->loaded = 0; | |
1289 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1290 | } | |
1291 | ||
1292 | #ifdef CONFIG_IP_MULTICAST | |
1293 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1294 | return; | |
87a8a2ae | 1295 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1296 | return; |
1da177e4 LT |
1297 | |
1298 | reporter = im->reporter; | |
1299 | igmp_stop_timer(im); | |
1300 | ||
1301 | if (!in_dev->dead) { | |
1302 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1303 | return; |
1da177e4 LT |
1304 | if (IGMP_V2_SEEN(in_dev)) { |
1305 | if (reporter) | |
1306 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1307 | return; |
1da177e4 LT |
1308 | } |
1309 | /* IGMPv3 */ | |
1310 | igmpv3_add_delrec(in_dev, im); | |
1311 | ||
1312 | igmp_ifc_event(in_dev); | |
1313 | } | |
1da177e4 | 1314 | #endif |
1da177e4 LT |
1315 | } |
1316 | ||
1317 | static void igmp_group_added(struct ip_mc_list *im) | |
1318 | { | |
1319 | struct in_device *in_dev = im->interface; | |
dcd87999 | 1320 | #ifdef CONFIG_IP_MULTICAST |
87a8a2ae | 1321 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1322 | #endif |
1da177e4 LT |
1323 | |
1324 | if (im->loaded == 0) { | |
1325 | im->loaded = 1; | |
1326 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1327 | } | |
1328 | ||
1329 | #ifdef CONFIG_IP_MULTICAST | |
1330 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1331 | return; | |
87a8a2ae | 1332 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1333 | return; |
1da177e4 LT |
1334 | |
1335 | if (in_dev->dead) | |
1336 | return; | |
1337 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1338 | spin_lock_bh(&im->lock); | |
436f7c20 | 1339 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); |
1da177e4 LT |
1340 | spin_unlock_bh(&im->lock); |
1341 | return; | |
1342 | } | |
1343 | /* else, v3 */ | |
1344 | ||
165094af | 1345 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1346 | igmp_ifc_event(in_dev); |
1347 | #endif | |
1348 | } | |
1349 | ||
1350 | ||
1351 | /* | |
1352 | * Multicast list managers | |
1353 | */ | |
1354 | ||
e9897071 ED |
1355 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1356 | { | |
c70eba74 | 1357 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1358 | } |
1359 | ||
1360 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1361 | struct ip_mc_list *im) | |
1362 | { | |
1363 | struct ip_mc_list __rcu **mc_hash; | |
1364 | u32 hash; | |
1365 | ||
1366 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1367 | if (mc_hash) { | |
1368 | hash = ip_mc_hash(im); | |
c70eba74 | 1369 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1370 | rcu_assign_pointer(mc_hash[hash], im); |
1371 | return; | |
1372 | } | |
1373 | ||
1374 | /* do not use a hash table for small number of items */ | |
1375 | if (in_dev->mc_count < 4) | |
1376 | return; | |
1377 | ||
1378 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1379 | GFP_KERNEL); | |
1380 | if (!mc_hash) | |
1381 | return; | |
1382 | ||
1383 | for_each_pmc_rtnl(in_dev, im) { | |
1384 | hash = ip_mc_hash(im); | |
c70eba74 | 1385 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1386 | RCU_INIT_POINTER(mc_hash[hash], im); |
1387 | } | |
1388 | ||
1389 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1390 | } | |
1391 | ||
1392 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1393 | struct ip_mc_list *im) | |
1394 | { | |
1395 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1396 | struct ip_mc_list *aux; | |
1397 | ||
1398 | if (!mc_hash) | |
1399 | return; | |
1400 | mc_hash += ip_mc_hash(im); | |
1401 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1402 | mc_hash = &aux->next_hash; | |
1403 | *mc_hash = im->next_hash; | |
1404 | } | |
1405 | ||
1da177e4 LT |
1406 | |
1407 | /* | |
1408 | * A socket has joined a multicast group on device dev. | |
1409 | */ | |
1410 | ||
8f935bbd | 1411 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1412 | { |
1413 | struct ip_mc_list *im; | |
dcd87999 | 1414 | #ifdef CONFIG_IP_MULTICAST |
165094af | 1415 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1416 | #endif |
1da177e4 LT |
1417 | |
1418 | ASSERT_RTNL(); | |
1419 | ||
1d7138de | 1420 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1421 | if (im->multiaddr == addr) { |
1422 | im->users++; | |
1423 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1424 | goto out; | |
1425 | } | |
1426 | } | |
1427 | ||
1d7138de | 1428 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1429 | if (!im) |
1430 | goto out; | |
1431 | ||
a7e9ff73 JK |
1432 | im->users = 1; |
1433 | im->interface = in_dev; | |
1da177e4 | 1434 | in_dev_hold(in_dev); |
a7e9ff73 | 1435 | im->multiaddr = addr; |
1da177e4 LT |
1436 | /* initial mode is (EX, empty) */ |
1437 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1438 | im->sfcount[MCAST_EXCLUDE] = 1; |
8851ab52 | 1439 | refcount_set(&im->refcnt, 1); |
1da177e4 LT |
1440 | spin_lock_init(&im->lock); |
1441 | #ifdef CONFIG_IP_MULTICAST | |
e99e88a9 | 1442 | timer_setup(&im->timer, igmp_timer_expire, 0); |
165094af | 1443 | im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1444 | #endif |
1d7138de ED |
1445 | |
1446 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1447 | in_dev->mc_count++; |
cf778b00 | 1448 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1449 | |
e9897071 ED |
1450 | ip_mc_hash_add(in_dev, im); |
1451 | ||
1da177e4 | 1452 | #ifdef CONFIG_IP_MULTICAST |
24803f38 | 1453 | igmpv3_del_delrec(in_dev, im); |
1da177e4 LT |
1454 | #endif |
1455 | igmp_group_added(im); | |
1456 | if (!in_dev->dead) | |
1457 | ip_rt_multicast_event(in_dev); | |
1458 | out: | |
1459 | return; | |
1460 | } | |
4bc2f18b | 1461 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1462 | |
9afd85c9 LL |
1463 | static int ip_mc_check_iphdr(struct sk_buff *skb) |
1464 | { | |
1465 | const struct iphdr *iph; | |
1466 | unsigned int len; | |
1467 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1468 | ||
1469 | if (!pskb_may_pull(skb, offset)) | |
1470 | return -EINVAL; | |
1471 | ||
1472 | iph = ip_hdr(skb); | |
1473 | ||
1474 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1475 | return -EINVAL; | |
1476 | ||
1477 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1478 | ||
1479 | if (!pskb_may_pull(skb, offset)) | |
1480 | return -EINVAL; | |
1481 | ||
1482 | iph = ip_hdr(skb); | |
1483 | ||
1484 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1485 | return -EINVAL; | |
1486 | ||
1487 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1488 | if (skb->len < len || len < offset) | |
1489 | return -EINVAL; | |
1490 | ||
1491 | skb_set_transport_header(skb, offset); | |
1492 | ||
1493 | return 0; | |
1494 | } | |
1495 | ||
1496 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1497 | { | |
1498 | unsigned int len = skb_transport_offset(skb); | |
1499 | ||
1500 | len += sizeof(struct igmpv3_report); | |
1501 | ||
1502 | return pskb_may_pull(skb, len) ? 0 : -EINVAL; | |
1503 | } | |
1504 | ||
1505 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1506 | { | |
1507 | unsigned int len = skb_transport_offset(skb); | |
1508 | ||
1509 | len += sizeof(struct igmphdr); | |
1510 | if (skb->len < len) | |
1511 | return -EINVAL; | |
1512 | ||
1513 | /* IGMPv{1,2}? */ | |
1514 | if (skb->len != len) { | |
1515 | /* or IGMPv3? */ | |
1516 | len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); | |
1517 | if (skb->len < len || !pskb_may_pull(skb, len)) | |
1518 | return -EINVAL; | |
1519 | } | |
1520 | ||
1521 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1522 | * all-systems destination addresses (224.0.0.1) for general queries | |
1523 | */ | |
1524 | if (!igmp_hdr(skb)->group && | |
1525 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1526 | return -EINVAL; | |
1527 | ||
1528 | return 0; | |
1529 | } | |
1530 | ||
1531 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1532 | { | |
1533 | switch (igmp_hdr(skb)->type) { | |
1534 | case IGMP_HOST_LEAVE_MESSAGE: | |
1535 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1536 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1537 | /* fall through */ | |
1538 | return 0; | |
1539 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1540 | return ip_mc_check_igmp_reportv3(skb); | |
1541 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1542 | return ip_mc_check_igmp_query(skb); | |
1543 | default: | |
1544 | return -ENOMSG; | |
1545 | } | |
1546 | } | |
1547 | ||
1548 | static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) | |
1549 | { | |
1550 | return skb_checksum_simple_validate(skb); | |
1551 | } | |
1552 | ||
1553 | static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1554 | ||
1555 | { | |
1556 | struct sk_buff *skb_chk; | |
1557 | unsigned int transport_len; | |
1558 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); | |
a516993f | 1559 | int ret = -EINVAL; |
9afd85c9 LL |
1560 | |
1561 | transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); | |
1562 | ||
9afd85c9 LL |
1563 | skb_chk = skb_checksum_trimmed(skb, transport_len, |
1564 | ip_mc_validate_checksum); | |
1565 | if (!skb_chk) | |
a516993f | 1566 | goto err; |
9afd85c9 | 1567 | |
a516993f LL |
1568 | if (!pskb_may_pull(skb_chk, len)) |
1569 | goto err; | |
9afd85c9 LL |
1570 | |
1571 | ret = ip_mc_check_igmp_msg(skb_chk); | |
a516993f LL |
1572 | if (ret) |
1573 | goto err; | |
9afd85c9 LL |
1574 | |
1575 | if (skb_trimmed) | |
1576 | *skb_trimmed = skb_chk; | |
a516993f LL |
1577 | /* free now unneeded clone */ |
1578 | else if (skb_chk != skb) | |
9afd85c9 LL |
1579 | kfree_skb(skb_chk); |
1580 | ||
a516993f LL |
1581 | ret = 0; |
1582 | ||
1583 | err: | |
1584 | if (ret && skb_chk && skb_chk != skb) | |
1585 | kfree_skb(skb_chk); | |
1586 | ||
1587 | return ret; | |
9afd85c9 LL |
1588 | } |
1589 | ||
1590 | /** | |
1591 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1592 | * @skb: the skb to validate | |
1593 | * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) | |
1594 | * | |
1595 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
a516993f | 1596 | * skb transport header accordingly and returns zero. |
9afd85c9 LL |
1597 | * |
1598 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1599 | * standard | |
1600 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1601 | * -ENOMEM: A memory allocation failure happened. | |
1602 | * | |
1603 | * Optionally, an skb pointer might be provided via skb_trimmed (or set it | |
1604 | * to NULL): After parsing an IGMP packet successfully it will point to | |
1605 | * an skb which has its tail aligned to the IP packet end. This might | |
1606 | * either be the originally provided skb or a trimmed, cloned version if | |
1607 | * the skb frame had data beyond the IP packet. A cloned skb allows us | |
1608 | * to leave the original skb and its full frame unchanged (which might be | |
1609 | * desirable for layer 2 frame jugglers). | |
1610 | * | |
a516993f LL |
1611 | * Caller needs to set the skb network header and free any returned skb if it |
1612 | * differs from the provided skb. | |
9afd85c9 LL |
1613 | */ |
1614 | int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1615 | { | |
1616 | int ret = ip_mc_check_iphdr(skb); | |
1617 | ||
1618 | if (ret < 0) | |
1619 | return ret; | |
1620 | ||
1621 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1622 | return -ENOMSG; | |
1623 | ||
1624 | return __ip_mc_check_igmp(skb, skb_trimmed); | |
1625 | } | |
1626 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1627 | ||
a816c7c7 | 1628 | /* |
4aa5dee4 | 1629 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1630 | */ |
4aa5dee4 | 1631 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1632 | { |
08882669 | 1633 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1634 | struct ip_mc_list *im; |
1635 | int type; | |
87a8a2ae | 1636 | struct net *net = dev_net(in_dev->dev); |
a816c7c7 | 1637 | |
4aa5dee4 JP |
1638 | ASSERT_RTNL(); |
1639 | ||
1640 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1641 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1642 | continue; | |
df2cf4a7 | 1643 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1644 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1645 | continue; |
a816c7c7 | 1646 | |
866f3b25 ED |
1647 | /* a failover is happening and switches |
1648 | * must be notified immediately | |
1649 | */ | |
1650 | if (IGMP_V1_SEEN(in_dev)) | |
1651 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1652 | else if (IGMP_V2_SEEN(in_dev)) | |
1653 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1654 | else | |
1655 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1656 | igmp_send_report(in_dev, im, type); | |
1657 | } | |
a816c7c7 JV |
1658 | #endif |
1659 | } | |
1660 | ||
1da177e4 LT |
1661 | /* |
1662 | * A socket has left a multicast group on device dev | |
1663 | */ | |
1664 | ||
8f935bbd | 1665 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1666 | { |
1d7138de ED |
1667 | struct ip_mc_list *i; |
1668 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1669 | |
1da177e4 | 1670 | ASSERT_RTNL(); |
e905a9ed | 1671 | |
1d7138de ED |
1672 | for (ip = &in_dev->mc_list; |
1673 | (i = rtnl_dereference(*ip)) != NULL; | |
1674 | ip = &i->next_rcu) { | |
a7e9ff73 | 1675 | if (i->multiaddr == addr) { |
1da177e4 | 1676 | if (--i->users == 0) { |
e9897071 | 1677 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1678 | *ip = i->next_rcu; |
b8bae41e | 1679 | in_dev->mc_count--; |
1da177e4 | 1680 | igmp_group_dropped(i); |
24cf3af3 | 1681 | ip_mc_clear_src(i); |
1da177e4 LT |
1682 | |
1683 | if (!in_dev->dead) | |
1684 | ip_rt_multicast_event(in_dev); | |
1685 | ||
1686 | ip_ma_put(i); | |
1687 | return; | |
1688 | } | |
1689 | break; | |
1690 | } | |
1691 | } | |
1692 | } | |
4bc2f18b | 1693 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1694 | |
75c78500 MS |
1695 | /* Device changing type */ |
1696 | ||
1697 | void ip_mc_unmap(struct in_device *in_dev) | |
1698 | { | |
1d7138de | 1699 | struct ip_mc_list *pmc; |
75c78500 MS |
1700 | |
1701 | ASSERT_RTNL(); | |
1702 | ||
1d7138de ED |
1703 | for_each_pmc_rtnl(in_dev, pmc) |
1704 | igmp_group_dropped(pmc); | |
75c78500 MS |
1705 | } |
1706 | ||
1707 | void ip_mc_remap(struct in_device *in_dev) | |
1708 | { | |
1d7138de | 1709 | struct ip_mc_list *pmc; |
75c78500 MS |
1710 | |
1711 | ASSERT_RTNL(); | |
1712 | ||
24803f38 HL |
1713 | for_each_pmc_rtnl(in_dev, pmc) { |
1714 | #ifdef CONFIG_IP_MULTICAST | |
1715 | igmpv3_del_delrec(in_dev, pmc); | |
1716 | #endif | |
1d7138de | 1717 | igmp_group_added(pmc); |
24803f38 | 1718 | } |
75c78500 MS |
1719 | } |
1720 | ||
1da177e4 LT |
1721 | /* Device going down */ |
1722 | ||
1723 | void ip_mc_down(struct in_device *in_dev) | |
1724 | { | |
1d7138de | 1725 | struct ip_mc_list *pmc; |
1da177e4 LT |
1726 | |
1727 | ASSERT_RTNL(); | |
1728 | ||
1d7138de ED |
1729 | for_each_pmc_rtnl(in_dev, pmc) |
1730 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1731 | |
1732 | #ifdef CONFIG_IP_MULTICAST | |
1733 | in_dev->mr_ifc_count = 0; | |
1734 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1735 | __in_dev_put(in_dev); | |
1736 | in_dev->mr_gq_running = 0; | |
1737 | if (del_timer(&in_dev->mr_gq_timer)) | |
1738 | __in_dev_put(in_dev); | |
1da177e4 LT |
1739 | #endif |
1740 | ||
1741 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1742 | } | |
1743 | ||
dcd87999 | 1744 | #ifdef CONFIG_IP_MULTICAST |
5b43d912 HL |
1745 | static void ip_mc_reset(struct in_device *in_dev) |
1746 | { | |
165094af | 1747 | struct net *net = dev_net(in_dev->dev); |
5b43d912 HL |
1748 | |
1749 | in_dev->mr_qi = IGMP_QUERY_INTERVAL; | |
1750 | in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL; | |
1751 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; | |
1752 | } | |
1753 | #else | |
1754 | static void ip_mc_reset(struct in_device *in_dev) | |
1755 | { | |
1756 | } | |
dcd87999 | 1757 | #endif |
5b43d912 HL |
1758 | |
1759 | void ip_mc_init_dev(struct in_device *in_dev) | |
1760 | { | |
1da177e4 LT |
1761 | ASSERT_RTNL(); |
1762 | ||
1da177e4 | 1763 | #ifdef CONFIG_IP_MULTICAST |
e99e88a9 KC |
1764 | timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0); |
1765 | timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0); | |
1da177e4 | 1766 | #endif |
5b43d912 | 1767 | ip_mc_reset(in_dev); |
1da177e4 | 1768 | |
1da177e4 LT |
1769 | spin_lock_init(&in_dev->mc_tomb_lock); |
1770 | } | |
1771 | ||
1772 | /* Device going up */ | |
1773 | ||
1774 | void ip_mc_up(struct in_device *in_dev) | |
1775 | { | |
1d7138de | 1776 | struct ip_mc_list *pmc; |
1da177e4 LT |
1777 | |
1778 | ASSERT_RTNL(); | |
1779 | ||
5b43d912 | 1780 | ip_mc_reset(in_dev); |
1da177e4 LT |
1781 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1782 | ||
24803f38 HL |
1783 | for_each_pmc_rtnl(in_dev, pmc) { |
1784 | #ifdef CONFIG_IP_MULTICAST | |
1785 | igmpv3_del_delrec(in_dev, pmc); | |
1786 | #endif | |
1d7138de | 1787 | igmp_group_added(pmc); |
24803f38 | 1788 | } |
1da177e4 LT |
1789 | } |
1790 | ||
1791 | /* | |
1792 | * Device is about to be destroyed: clean up. | |
1793 | */ | |
1794 | ||
1795 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1796 | { | |
1797 | struct ip_mc_list *i; | |
1798 | ||
1799 | ASSERT_RTNL(); | |
1800 | ||
1801 | /* Deactivate timers */ | |
1802 | ip_mc_down(in_dev); | |
24803f38 HL |
1803 | #ifdef CONFIG_IP_MULTICAST |
1804 | igmpv3_clear_delrec(in_dev); | |
1805 | #endif | |
1da177e4 | 1806 | |
1d7138de ED |
1807 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1808 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1809 | in_dev->mc_count--; |
1da177e4 | 1810 | ip_ma_put(i); |
1da177e4 | 1811 | } |
1da177e4 LT |
1812 | } |
1813 | ||
9e917dca | 1814 | /* RTNL is locked */ |
877acedc | 1815 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1816 | { |
1da177e4 LT |
1817 | struct net_device *dev = NULL; |
1818 | struct in_device *idev = NULL; | |
1819 | ||
1820 | if (imr->imr_ifindex) { | |
877acedc | 1821 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1822 | return idev; |
1823 | } | |
1824 | if (imr->imr_address.s_addr) { | |
9e917dca | 1825 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1826 | if (!dev) |
1827 | return NULL; | |
1da177e4 LT |
1828 | } |
1829 | ||
b23dd4fe | 1830 | if (!dev) { |
78fbfd8a DM |
1831 | struct rtable *rt = ip_route_output(net, |
1832 | imr->imr_multiaddr.s_addr, | |
1833 | 0, 0, 0); | |
b23dd4fe DM |
1834 | if (!IS_ERR(rt)) { |
1835 | dev = rt->dst.dev; | |
1836 | ip_rt_put(rt); | |
1837 | } | |
1da177e4 LT |
1838 | } |
1839 | if (dev) { | |
1840 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1841 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1842 | } |
1843 | return idev; | |
1844 | } | |
1845 | ||
1846 | /* | |
1847 | * Join a socket to a group | |
1848 | */ | |
1da177e4 LT |
1849 | |
1850 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1851 | __be32 *psfsrc) |
1da177e4 LT |
1852 | { |
1853 | struct ip_sf_list *psf, *psf_prev; | |
1854 | int rv = 0; | |
1855 | ||
1856 | psf_prev = NULL; | |
c71151f0 | 1857 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1858 | if (psf->sf_inaddr == *psfsrc) |
1859 | break; | |
1860 | psf_prev = psf; | |
1861 | } | |
1862 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1863 | /* source filter not found, or count wrong => bug */ | |
1864 | return -ESRCH; | |
1865 | } | |
1866 | psf->sf_count[sfmode]--; | |
1867 | if (psf->sf_count[sfmode] == 0) { | |
1868 | ip_rt_multicast_event(pmc->interface); | |
1869 | } | |
1870 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1871 | #ifdef CONFIG_IP_MULTICAST | |
1872 | struct in_device *in_dev = pmc->interface; | |
165094af | 1873 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1874 | #endif |
1875 | ||
1876 | /* no more filters for this source */ | |
1877 | if (psf_prev) | |
1878 | psf_prev->sf_next = psf->sf_next; | |
1879 | else | |
1880 | pmc->sources = psf->sf_next; | |
1881 | #ifdef CONFIG_IP_MULTICAST | |
1882 | if (psf->sf_oldin && | |
1883 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
165094af | 1884 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1885 | psf->sf_next = pmc->tomb; |
1886 | pmc->tomb = psf; | |
1887 | rv = 1; | |
1888 | } else | |
1889 | #endif | |
1890 | kfree(psf); | |
1891 | } | |
1892 | return rv; | |
1893 | } | |
1894 | ||
1895 | #ifndef CONFIG_IP_MULTICAST | |
1896 | #define igmp_ifc_event(x) do { } while (0) | |
1897 | #endif | |
1898 | ||
8f935bbd AV |
1899 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1900 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1901 | { |
1902 | struct ip_mc_list *pmc; | |
1903 | int changerec = 0; | |
1904 | int i, err; | |
1905 | ||
1906 | if (!in_dev) | |
1907 | return -ENODEV; | |
1d7138de ED |
1908 | rcu_read_lock(); |
1909 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1910 | if (*pmca == pmc->multiaddr) |
1911 | break; | |
1912 | } | |
1913 | if (!pmc) { | |
1914 | /* MCA not found?? bug */ | |
1d7138de | 1915 | rcu_read_unlock(); |
1da177e4 LT |
1916 | return -ESRCH; |
1917 | } | |
1918 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1919 | rcu_read_unlock(); |
1da177e4 LT |
1920 | #ifdef CONFIG_IP_MULTICAST |
1921 | sf_markstate(pmc); | |
1922 | #endif | |
1923 | if (!delta) { | |
1924 | err = -EINVAL; | |
1925 | if (!pmc->sfcount[sfmode]) | |
1926 | goto out_unlock; | |
1927 | pmc->sfcount[sfmode]--; | |
1928 | } | |
1929 | err = 0; | |
c71151f0 | 1930 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
1931 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
1932 | ||
1933 | changerec |= rv > 0; | |
1934 | if (!err && rv < 0) | |
1935 | err = rv; | |
1936 | } | |
1937 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1938 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1939 | pmc->sfcount[MCAST_INCLUDE]) { | |
1940 | #ifdef CONFIG_IP_MULTICAST | |
1941 | struct ip_sf_list *psf; | |
165094af | 1942 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1943 | #endif |
1944 | ||
1945 | /* filter mode change */ | |
1946 | pmc->sfmode = MCAST_INCLUDE; | |
1947 | #ifdef CONFIG_IP_MULTICAST | |
165094af | 1948 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1949 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 1950 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1951 | psf->sf_crcount = 0; |
1952 | igmp_ifc_event(pmc->interface); | |
1953 | } else if (sf_setstate(pmc) || changerec) { | |
1954 | igmp_ifc_event(pmc->interface); | |
1955 | #endif | |
1956 | } | |
1957 | out_unlock: | |
1958 | spin_unlock_bh(&pmc->lock); | |
1959 | return err; | |
1960 | } | |
1961 | ||
1962 | /* | |
1963 | * Add multicast single-source filter to the interface list | |
1964 | */ | |
1965 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1966 | __be32 *psfsrc) |
1da177e4 LT |
1967 | { |
1968 | struct ip_sf_list *psf, *psf_prev; | |
1969 | ||
1970 | psf_prev = NULL; | |
c71151f0 | 1971 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1972 | if (psf->sf_inaddr == *psfsrc) |
1973 | break; | |
1974 | psf_prev = psf; | |
1975 | } | |
1976 | if (!psf) { | |
0da974f4 | 1977 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1978 | if (!psf) |
1979 | return -ENOBUFS; | |
1da177e4 LT |
1980 | psf->sf_inaddr = *psfsrc; |
1981 | if (psf_prev) { | |
1982 | psf_prev->sf_next = psf; | |
1983 | } else | |
1984 | pmc->sources = psf; | |
1985 | } | |
1986 | psf->sf_count[sfmode]++; | |
1987 | if (psf->sf_count[sfmode] == 1) { | |
1988 | ip_rt_multicast_event(pmc->interface); | |
1989 | } | |
1990 | return 0; | |
1991 | } | |
1992 | ||
1993 | #ifdef CONFIG_IP_MULTICAST | |
1994 | static void sf_markstate(struct ip_mc_list *pmc) | |
1995 | { | |
1996 | struct ip_sf_list *psf; | |
1997 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1998 | ||
c71151f0 | 1999 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2000 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
2001 | psf->sf_oldin = mca_xcount == | |
2002 | psf->sf_count[MCAST_EXCLUDE] && | |
2003 | !psf->sf_count[MCAST_INCLUDE]; | |
2004 | } else | |
2005 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
2006 | } | |
2007 | ||
2008 | static int sf_setstate(struct ip_mc_list *pmc) | |
2009 | { | |
ad12583f | 2010 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
2011 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
2012 | int qrv = pmc->interface->mr_qrv; | |
2013 | int new_in, rv; | |
2014 | ||
2015 | rv = 0; | |
c71151f0 | 2016 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2017 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
2018 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
2019 | !psf->sf_count[MCAST_INCLUDE]; | |
2020 | } else | |
2021 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
2022 | if (new_in) { |
2023 | if (!psf->sf_oldin) { | |
76edc605 | 2024 | struct ip_sf_list *prev = NULL; |
ad12583f | 2025 | |
c71151f0 | 2026 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
2027 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
2028 | break; | |
2029 | prev = dpsf; | |
2030 | } | |
2031 | if (dpsf) { | |
2032 | if (prev) | |
2033 | prev->sf_next = dpsf->sf_next; | |
2034 | else | |
2035 | pmc->tomb = dpsf->sf_next; | |
2036 | kfree(dpsf); | |
2037 | } | |
2038 | psf->sf_crcount = qrv; | |
2039 | rv++; | |
2040 | } | |
2041 | } else if (psf->sf_oldin) { | |
2042 | ||
2043 | psf->sf_crcount = 0; | |
2044 | /* | |
2045 | * add or update "delete" records if an active filter | |
2046 | * is now inactive | |
2047 | */ | |
c71151f0 | 2048 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
2049 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
2050 | break; | |
2051 | if (!dpsf) { | |
3ed37a6f | 2052 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
2053 | if (!dpsf) |
2054 | continue; | |
2055 | *dpsf = *psf; | |
2056 | /* pmc->lock held by callers */ | |
2057 | dpsf->sf_next = pmc->tomb; | |
2058 | pmc->tomb = dpsf; | |
2059 | } | |
2060 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
2061 | rv++; |
2062 | } | |
2063 | } | |
2064 | return rv; | |
2065 | } | |
2066 | #endif | |
2067 | ||
2068 | /* | |
2069 | * Add multicast source filter list to the interface list | |
2070 | */ | |
8f935bbd AV |
2071 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
2072 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
2073 | { |
2074 | struct ip_mc_list *pmc; | |
2075 | int isexclude; | |
2076 | int i, err; | |
2077 | ||
2078 | if (!in_dev) | |
2079 | return -ENODEV; | |
1d7138de ED |
2080 | rcu_read_lock(); |
2081 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
2082 | if (*pmca == pmc->multiaddr) |
2083 | break; | |
2084 | } | |
2085 | if (!pmc) { | |
2086 | /* MCA not found?? bug */ | |
1d7138de | 2087 | rcu_read_unlock(); |
1da177e4 LT |
2088 | return -ESRCH; |
2089 | } | |
2090 | spin_lock_bh(&pmc->lock); | |
1d7138de | 2091 | rcu_read_unlock(); |
1da177e4 LT |
2092 | |
2093 | #ifdef CONFIG_IP_MULTICAST | |
2094 | sf_markstate(pmc); | |
2095 | #endif | |
2096 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
2097 | if (!delta) | |
2098 | pmc->sfcount[sfmode]++; | |
2099 | err = 0; | |
c71151f0 | 2100 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 2101 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
2102 | if (err) |
2103 | break; | |
2104 | } | |
2105 | if (err) { | |
2106 | int j; | |
2107 | ||
685f94e6 JZ |
2108 | if (!delta) |
2109 | pmc->sfcount[sfmode]--; | |
c71151f0 | 2110 | for (j = 0; j < i; j++) |
a1889c0d | 2111 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
2112 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
2113 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 2114 | struct ip_sf_list *psf; |
165094af | 2115 | struct net *net = dev_net(pmc->interface->dev); |
cfcabdcc | 2116 | in_dev = pmc->interface; |
1da177e4 LT |
2117 | #endif |
2118 | ||
2119 | /* filter mode change */ | |
2120 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
2121 | pmc->sfmode = MCAST_EXCLUDE; | |
2122 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
2123 | pmc->sfmode = MCAST_INCLUDE; | |
2124 | #ifdef CONFIG_IP_MULTICAST | |
2125 | /* else no filters; keep old mode for reports */ | |
2126 | ||
165094af | 2127 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 2128 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 2129 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2130 | psf->sf_crcount = 0; |
2131 | igmp_ifc_event(in_dev); | |
2132 | } else if (sf_setstate(pmc)) { | |
2133 | igmp_ifc_event(in_dev); | |
2134 | #endif | |
2135 | } | |
2136 | spin_unlock_bh(&pmc->lock); | |
2137 | return err; | |
2138 | } | |
2139 | ||
2140 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
2141 | { | |
780fdb71 | 2142 | struct ip_sf_list *tomb, *sources; |
1da177e4 | 2143 | |
c38b7d32 WC |
2144 | spin_lock_bh(&pmc->lock); |
2145 | tomb = pmc->tomb; | |
2146 | pmc->tomb = NULL; | |
2147 | sources = pmc->sources; | |
2148 | pmc->sources = NULL; | |
2149 | pmc->sfmode = MCAST_EXCLUDE; | |
2150 | pmc->sfcount[MCAST_INCLUDE] = 0; | |
2151 | pmc->sfcount[MCAST_EXCLUDE] = 1; | |
2152 | spin_unlock_bh(&pmc->lock); | |
2153 | ||
780fdb71 ED |
2154 | ip_sf_list_clear_all(tomb); |
2155 | ip_sf_list_clear_all(sources); | |
1da177e4 LT |
2156 | } |
2157 | ||
54ff9ef3 MRL |
2158 | /* Join a multicast group |
2159 | */ | |
2160 | ||
2161 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
1da177e4 | 2162 | { |
8f935bbd | 2163 | __be32 addr = imr->imr_multiaddr.s_addr; |
959d10f6 | 2164 | struct ip_mc_socklist *iml, *i; |
1da177e4 LT |
2165 | struct in_device *in_dev; |
2166 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 2167 | struct net *net = sock_net(sk); |
ca9b907d | 2168 | int ifindex; |
1da177e4 | 2169 | int count = 0; |
959d10f6 ED |
2170 | int err; |
2171 | ||
2172 | ASSERT_RTNL(); | |
1da177e4 | 2173 | |
f97c1e0c | 2174 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2175 | return -EINVAL; |
2176 | ||
877acedc | 2177 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
2178 | |
2179 | if (!in_dev) { | |
1da177e4 LT |
2180 | err = -ENODEV; |
2181 | goto done; | |
2182 | } | |
2183 | ||
1da177e4 | 2184 | err = -EADDRINUSE; |
ca9b907d | 2185 | ifindex = imr->imr_ifindex; |
1d7138de | 2186 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
2187 | if (i->multi.imr_multiaddr.s_addr == addr && |
2188 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 2189 | goto done; |
1da177e4 LT |
2190 | count++; |
2191 | } | |
2192 | err = -ENOBUFS; | |
815c5270 | 2193 | if (count >= net->ipv4.sysctl_igmp_max_memberships) |
ca9b907d | 2194 | goto done; |
a7e9ff73 | 2195 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
51456b29 | 2196 | if (!iml) |
1da177e4 | 2197 | goto done; |
ca9b907d | 2198 | |
1da177e4 | 2199 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 2200 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
2201 | iml->sflist = NULL; |
2202 | iml->sfmode = MCAST_EXCLUDE; | |
cf778b00 | 2203 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 2204 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 2205 | err = 0; |
1da177e4 | 2206 | done: |
1da177e4 LT |
2207 | return err; |
2208 | } | |
4bc2f18b | 2209 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
2210 | |
2211 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
2212 | struct in_device *in_dev) | |
2213 | { | |
1d7138de | 2214 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
2215 | int err; |
2216 | ||
51456b29 | 2217 | if (!psf) { |
1da177e4 LT |
2218 | /* any-source empty exclude case */ |
2219 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2220 | iml->sfmode, 0, NULL, 0); | |
2221 | } | |
2222 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 2223 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 2224 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
2225 | /* decrease mem now to avoid the memleak warning */ |
2226 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2227 | kfree_rcu(psf, rcu); |
1da177e4 LT |
2228 | return err; |
2229 | } | |
2230 | ||
54ff9ef3 | 2231 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
1da177e4 LT |
2232 | { |
2233 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
2234 | struct ip_mc_socklist *iml; |
2235 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 2236 | struct in_device *in_dev; |
877acedc | 2237 | struct net *net = sock_net(sk); |
8f935bbd | 2238 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 2239 | u32 ifindex; |
acd6e00b | 2240 | int ret = -EADDRNOTAVAIL; |
1da177e4 | 2241 | |
959d10f6 ED |
2242 | ASSERT_RTNL(); |
2243 | ||
877acedc | 2244 | in_dev = ip_mc_find_dev(net, imr); |
4eba7bb1 | 2245 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
52ad353a | 2246 | ret = -ENODEV; |
2247 | goto out; | |
2248 | } | |
84b42bae | 2249 | ifindex = imr->imr_ifindex; |
1d7138de ED |
2250 | for (imlp = &inet->mc_list; |
2251 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2252 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
2253 | if (iml->multi.imr_multiaddr.s_addr != group) |
2254 | continue; | |
2255 | if (ifindex) { | |
2256 | if (iml->multi.imr_ifindex != ifindex) | |
2257 | continue; | |
2258 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2259 | iml->multi.imr_address.s_addr) | |
2260 | continue; | |
1da177e4 | 2261 | |
acd6e00b | 2262 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 2263 | |
1d7138de | 2264 | *imlp = iml->next_rcu; |
acd6e00b | 2265 | |
4eba7bb1 AL |
2266 | if (in_dev) |
2267 | ip_mc_dec_group(in_dev, group); | |
959d10f6 | 2268 | |
c85bb41e FL |
2269 | /* decrease mem now to avoid the memleak warning */ |
2270 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2271 | kfree_rcu(iml, rcu); |
acd6e00b | 2272 | return 0; |
1da177e4 | 2273 | } |
52ad353a | 2274 | out: |
959d10f6 ED |
2275 | return ret; |
2276 | } | |
193ba924 | 2277 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
2278 | |
2279 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2280 | ip_mreq_source *mreqs, int ifindex) | |
2281 | { | |
2282 | int err; | |
2283 | struct ip_mreqn imr; | |
63007727 | 2284 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
2285 | struct ip_mc_socklist *pmc; |
2286 | struct in_device *in_dev = NULL; | |
2287 | struct inet_sock *inet = inet_sk(sk); | |
2288 | struct ip_sf_socklist *psl; | |
877acedc | 2289 | struct net *net = sock_net(sk); |
8cdaaa15 | 2290 | int leavegroup = 0; |
1da177e4 LT |
2291 | int i, j, rv; |
2292 | ||
f97c1e0c | 2293 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2294 | return -EINVAL; |
2295 | ||
54ff9ef3 | 2296 | ASSERT_RTNL(); |
1da177e4 LT |
2297 | |
2298 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2299 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2300 | imr.imr_ifindex = ifindex; | |
877acedc | 2301 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2302 | |
2303 | if (!in_dev) { | |
2304 | err = -ENODEV; | |
2305 | goto done; | |
2306 | } | |
2307 | err = -EADDRNOTAVAIL; | |
2308 | ||
1d7138de | 2309 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2310 | if ((pmc->multi.imr_multiaddr.s_addr == |
2311 | imr.imr_multiaddr.s_addr) && | |
2312 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2313 | break; |
2314 | } | |
917f2f10 DS |
2315 | if (!pmc) { /* must have a prior join */ |
2316 | err = -EINVAL; | |
1da177e4 | 2317 | goto done; |
917f2f10 | 2318 | } |
1da177e4 LT |
2319 | /* if a source filter was set, must be the same mode as before */ |
2320 | if (pmc->sflist) { | |
917f2f10 DS |
2321 | if (pmc->sfmode != omode) { |
2322 | err = -EINVAL; | |
1da177e4 | 2323 | goto done; |
917f2f10 | 2324 | } |
1da177e4 LT |
2325 | } else if (pmc->sfmode != omode) { |
2326 | /* allow mode switches for empty-set filters */ | |
2327 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2328 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2329 | NULL, 0); |
2330 | pmc->sfmode = omode; | |
2331 | } | |
2332 | ||
1d7138de | 2333 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2334 | if (!add) { |
2335 | if (!psl) | |
917f2f10 | 2336 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2337 | rv = !0; |
c71151f0 | 2338 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2339 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2340 | sizeof(__be32)); |
1da177e4 LT |
2341 | if (rv == 0) |
2342 | break; | |
2343 | } | |
2344 | if (rv) /* source not found */ | |
917f2f10 | 2345 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2346 | |
8cdaaa15 DS |
2347 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2348 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2349 | leavegroup = 1; | |
2350 | goto done; | |
2351 | } | |
2352 | ||
1da177e4 | 2353 | /* update the interface filter */ |
e905a9ed | 2354 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2355 | &mreqs->imr_sourceaddr, 1); |
2356 | ||
c71151f0 | 2357 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2358 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2359 | psl->sl_count--; | |
2360 | err = 0; | |
2361 | goto done; | |
2362 | } | |
2363 | /* else, add a new source to the filter */ | |
2364 | ||
166b6b2d | 2365 | if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { |
1da177e4 LT |
2366 | err = -ENOBUFS; |
2367 | goto done; | |
2368 | } | |
2369 | if (!psl || psl->sl_count == psl->sl_max) { | |
2370 | struct ip_sf_socklist *newpsl; | |
2371 | int count = IP_SFBLOCK; | |
2372 | ||
2373 | if (psl) | |
2374 | count += psl->sl_max; | |
8b3a7005 | 2375 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2376 | if (!newpsl) { |
2377 | err = -ENOBUFS; | |
2378 | goto done; | |
2379 | } | |
2380 | newpsl->sl_max = count; | |
2381 | newpsl->sl_count = count - IP_SFBLOCK; | |
2382 | if (psl) { | |
c71151f0 | 2383 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2384 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e FL |
2385 | /* decrease mem now to avoid the memleak warning */ |
2386 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2387 | kfree_rcu(psl, rcu); |
1da177e4 | 2388 | } |
cf778b00 | 2389 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2390 | psl = newpsl; |
1da177e4 LT |
2391 | } |
2392 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2393 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2394 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2395 | sizeof(__be32)); |
1da177e4 LT |
2396 | if (rv == 0) |
2397 | break; | |
2398 | } | |
2399 | if (rv == 0) /* address already there is an error */ | |
2400 | goto done; | |
c71151f0 | 2401 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2402 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2403 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2404 | psl->sl_count++; | |
2405 | err = 0; | |
2406 | /* update the interface list */ | |
e905a9ed | 2407 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2408 | &mreqs->imr_sourceaddr, 1); |
2409 | done: | |
8cdaaa15 | 2410 | if (leavegroup) |
54ff9ef3 | 2411 | err = ip_mc_leave_group(sk, &imr); |
1da177e4 LT |
2412 | return err; |
2413 | } | |
2414 | ||
2415 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2416 | { | |
9951f036 | 2417 | int err = 0; |
1da177e4 | 2418 | struct ip_mreqn imr; |
63007727 | 2419 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2420 | struct ip_mc_socklist *pmc; |
2421 | struct in_device *in_dev; | |
2422 | struct inet_sock *inet = inet_sk(sk); | |
2423 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2424 | struct net *net = sock_net(sk); |
9951f036 | 2425 | int leavegroup = 0; |
1da177e4 | 2426 | |
f97c1e0c | 2427 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2428 | return -EINVAL; |
2429 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2430 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2431 | return -EINVAL; | |
2432 | ||
54ff9ef3 | 2433 | ASSERT_RTNL(); |
1da177e4 LT |
2434 | |
2435 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2436 | imr.imr_address.s_addr = msf->imsf_interface; | |
2437 | imr.imr_ifindex = ifindex; | |
877acedc | 2438 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2439 | |
2440 | if (!in_dev) { | |
2441 | err = -ENODEV; | |
2442 | goto done; | |
2443 | } | |
1da177e4 | 2444 | |
9951f036 DS |
2445 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2446 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2447 | leavegroup = 1; | |
2448 | goto done; | |
2449 | } | |
2450 | ||
1d7138de | 2451 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2452 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2453 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2454 | break; | |
2455 | } | |
917f2f10 DS |
2456 | if (!pmc) { /* must have a prior join */ |
2457 | err = -EINVAL; | |
1da177e4 | 2458 | goto done; |
917f2f10 | 2459 | } |
1da177e4 | 2460 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2461 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2462 | GFP_KERNEL); | |
1da177e4 LT |
2463 | if (!newpsl) { |
2464 | err = -ENOBUFS; | |
2465 | goto done; | |
2466 | } | |
2467 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2468 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2469 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2470 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2471 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2472 | if (err) { | |
2473 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2474 | goto done; | |
2475 | } | |
8713dbf0 | 2476 | } else { |
1da177e4 | 2477 | newpsl = NULL; |
8713dbf0 YZ |
2478 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2479 | msf->imsf_fmode, 0, NULL, 0); | |
2480 | } | |
1d7138de | 2481 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2482 | if (psl) { |
2483 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2484 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2485 | /* decrease mem now to avoid the memleak warning */ |
2486 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2487 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2488 | } else |
2489 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2490 | 0, NULL, 0); | |
cf778b00 | 2491 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2492 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2493 | err = 0; |
1da177e4 | 2494 | done: |
9951f036 DS |
2495 | if (leavegroup) |
2496 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2497 | return err; |
2498 | } | |
2499 | ||
2500 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2501 | struct ip_msfilter __user *optval, int __user *optlen) | |
2502 | { | |
2503 | int err, len, count, copycount; | |
2504 | struct ip_mreqn imr; | |
63007727 | 2505 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2506 | struct ip_mc_socklist *pmc; |
2507 | struct in_device *in_dev; | |
2508 | struct inet_sock *inet = inet_sk(sk); | |
2509 | struct ip_sf_socklist *psl; | |
877acedc | 2510 | struct net *net = sock_net(sk); |
1da177e4 | 2511 | |
87e9f031 WC |
2512 | ASSERT_RTNL(); |
2513 | ||
f97c1e0c | 2514 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2515 | return -EINVAL; |
2516 | ||
1da177e4 LT |
2517 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
2518 | imr.imr_address.s_addr = msf->imsf_interface; | |
2519 | imr.imr_ifindex = 0; | |
877acedc | 2520 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2521 | |
2522 | if (!in_dev) { | |
2523 | err = -ENODEV; | |
2524 | goto done; | |
2525 | } | |
2526 | err = -EADDRNOTAVAIL; | |
2527 | ||
1d7138de | 2528 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2529 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2530 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2531 | break; | |
2532 | } | |
2533 | if (!pmc) /* must have a prior join */ | |
2534 | goto done; | |
2535 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2536 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2537 | if (!psl) { |
2538 | len = 0; | |
2539 | count = 0; | |
2540 | } else { | |
2541 | count = psl->sl_count; | |
2542 | } | |
2543 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2544 | len = copycount * sizeof(psl->sl_addr[0]); | |
2545 | msf->imsf_numsrc = count; | |
2546 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2547 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2548 | return -EFAULT; | |
2549 | } | |
2550 | if (len && | |
2551 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2552 | return -EFAULT; | |
2553 | return 0; | |
2554 | done: | |
1da177e4 LT |
2555 | return err; |
2556 | } | |
2557 | ||
2558 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2559 | struct group_filter __user *optval, int __user *optlen) | |
2560 | { | |
2561 | int err, i, count, copycount; | |
2562 | struct sockaddr_in *psin; | |
63007727 | 2563 | __be32 addr; |
1da177e4 LT |
2564 | struct ip_mc_socklist *pmc; |
2565 | struct inet_sock *inet = inet_sk(sk); | |
2566 | struct ip_sf_socklist *psl; | |
2567 | ||
87e9f031 WC |
2568 | ASSERT_RTNL(); |
2569 | ||
1da177e4 LT |
2570 | psin = (struct sockaddr_in *)&gsf->gf_group; |
2571 | if (psin->sin_family != AF_INET) | |
2572 | return -EINVAL; | |
2573 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2574 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2575 | return -EINVAL; |
2576 | ||
1da177e4 LT |
2577 | err = -EADDRNOTAVAIL; |
2578 | ||
1d7138de | 2579 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2580 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2581 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2582 | break; | |
2583 | } | |
2584 | if (!pmc) /* must have a prior join */ | |
2585 | goto done; | |
2586 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2587 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2588 | count = psl ? psl->sl_count : 0; |
2589 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2590 | gsf->gf_numsrc = count; | |
2591 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2592 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2593 | return -EFAULT; | |
2594 | } | |
c71151f0 | 2595 | for (i = 0; i < copycount; i++) { |
1da177e4 LT |
2596 | struct sockaddr_storage ss; |
2597 | ||
2598 | psin = (struct sockaddr_in *)&ss; | |
2599 | memset(&ss, 0, sizeof(ss)); | |
2600 | psin->sin_family = AF_INET; | |
2601 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2602 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2603 | return -EFAULT; | |
2604 | } | |
2605 | return 0; | |
2606 | done: | |
1da177e4 LT |
2607 | return err; |
2608 | } | |
2609 | ||
2610 | /* | |
2611 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2612 | */ | |
60d9b031 DA |
2613 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, |
2614 | int dif, int sdif) | |
1da177e4 LT |
2615 | { |
2616 | struct inet_sock *inet = inet_sk(sk); | |
2617 | struct ip_mc_socklist *pmc; | |
2618 | struct ip_sf_socklist *psl; | |
2619 | int i; | |
c85bb41e | 2620 | int ret; |
1da177e4 | 2621 | |
c85bb41e | 2622 | ret = 1; |
f97c1e0c | 2623 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2624 | goto out; |
1da177e4 | 2625 | |
c85bb41e | 2626 | rcu_read_lock(); |
1d7138de | 2627 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 | 2628 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
60d9b031 DA |
2629 | (pmc->multi.imr_ifindex == dif || |
2630 | (sdif && pmc->multi.imr_ifindex == sdif))) | |
1da177e4 LT |
2631 | break; |
2632 | } | |
c85bb41e | 2633 | ret = inet->mc_all; |
1da177e4 | 2634 | if (!pmc) |
c85bb41e | 2635 | goto unlock; |
1d7138de | 2636 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2637 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2638 | if (!psl) |
c85bb41e | 2639 | goto unlock; |
1da177e4 | 2640 | |
c71151f0 | 2641 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2642 | if (psl->sl_addr[i] == rmt_addr) |
2643 | break; | |
2644 | } | |
c85bb41e | 2645 | ret = 0; |
1da177e4 | 2646 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2647 | goto unlock; |
1da177e4 | 2648 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2649 | goto unlock; |
2650 | ret = 1; | |
2651 | unlock: | |
2652 | rcu_read_unlock(); | |
2653 | out: | |
2654 | return ret; | |
1da177e4 LT |
2655 | } |
2656 | ||
2657 | /* | |
2658 | * A socket is closing. | |
2659 | */ | |
2660 | ||
2661 | void ip_mc_drop_socket(struct sock *sk) | |
2662 | { | |
2663 | struct inet_sock *inet = inet_sk(sk); | |
2664 | struct ip_mc_socklist *iml; | |
877acedc | 2665 | struct net *net = sock_net(sk); |
1da177e4 | 2666 | |
51456b29 | 2667 | if (!inet->mc_list) |
1da177e4 LT |
2668 | return; |
2669 | ||
2670 | rtnl_lock(); | |
1d7138de | 2671 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2672 | struct in_device *in_dev; |
1da177e4 | 2673 | |
1d7138de | 2674 | inet->mc_list = iml->next_rcu; |
877acedc | 2675 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2676 | (void) ip_mc_leave_src(sk, iml, in_dev); |
00db4124 | 2677 | if (in_dev) |
1da177e4 | 2678 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2679 | /* decrease mem now to avoid the memleak warning */ |
2680 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2681 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2682 | } |
2683 | rtnl_unlock(); | |
2684 | } | |
2685 | ||
dbdd9a52 | 2686 | /* called with rcu_read_lock() */ |
2094acbb | 2687 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
1da177e4 LT |
2688 | { |
2689 | struct ip_mc_list *im; | |
e9897071 | 2690 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2691 | struct ip_sf_list *psf; |
2692 | int rv = 0; | |
2693 | ||
e9897071 ED |
2694 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2695 | if (mc_hash) { | |
c70eba74 | 2696 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2697 | |
2698 | for (im = rcu_dereference(mc_hash[hash]); | |
2699 | im != NULL; | |
2700 | im = rcu_dereference(im->next_hash)) { | |
2701 | if (im->multiaddr == mc_addr) | |
2702 | break; | |
2703 | } | |
2704 | } else { | |
2705 | for_each_pmc_rcu(in_dev, im) { | |
2706 | if (im->multiaddr == mc_addr) | |
2707 | break; | |
2708 | } | |
1da177e4 LT |
2709 | } |
2710 | if (im && proto == IPPROTO_IGMP) { | |
2711 | rv = 1; | |
2712 | } else if (im) { | |
2713 | if (src_addr) { | |
c71151f0 | 2714 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2715 | if (psf->sf_inaddr == src_addr) |
2716 | break; | |
2717 | } | |
2718 | if (psf) | |
2719 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2720 | psf->sf_count[MCAST_EXCLUDE] != | |
2721 | im->sfcount[MCAST_EXCLUDE]; | |
2722 | else | |
2723 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2724 | } else | |
2725 | rv = 1; /* unspecified source; tentatively allow */ | |
2726 | } | |
1da177e4 LT |
2727 | return rv; |
2728 | } | |
2729 | ||
2730 | #if defined(CONFIG_PROC_FS) | |
2731 | struct igmp_mc_iter_state { | |
7091e728 | 2732 | struct seq_net_private p; |
1da177e4 LT |
2733 | struct net_device *dev; |
2734 | struct in_device *in_dev; | |
2735 | }; | |
2736 | ||
2737 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2738 | ||
2739 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2740 | { | |
7091e728 | 2741 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2742 | struct ip_mc_list *im = NULL; |
2743 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2744 | ||
7562f876 | 2745 | state->in_dev = NULL; |
61fbab77 | 2746 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2747 | struct in_device *in_dev; |
6baff150 ED |
2748 | |
2749 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2750 | if (!in_dev) |
2751 | continue; | |
1d7138de | 2752 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2753 | if (im) { |
2754 | state->in_dev = in_dev; | |
2755 | break; | |
2756 | } | |
1da177e4 LT |
2757 | } |
2758 | return im; | |
2759 | } | |
2760 | ||
2761 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2762 | { | |
2763 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2764 | |
1d7138de ED |
2765 | im = rcu_dereference(im->next_rcu); |
2766 | while (!im) { | |
6baff150 | 2767 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2768 | if (!state->dev) { |
2769 | state->in_dev = NULL; | |
2770 | break; | |
2771 | } | |
6baff150 | 2772 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2773 | if (!state->in_dev) |
2774 | continue; | |
1d7138de | 2775 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2776 | } |
2777 | return im; | |
2778 | } | |
2779 | ||
2780 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2781 | { | |
2782 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2783 | if (im) | |
2784 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2785 | --pos; | |
2786 | return pos ? NULL : im; | |
2787 | } | |
2788 | ||
2789 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2790 | __acquires(rcu) |
1da177e4 | 2791 | { |
61fbab77 | 2792 | rcu_read_lock(); |
1da177e4 LT |
2793 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2794 | } | |
2795 | ||
2796 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2797 | { | |
2798 | struct ip_mc_list *im; | |
2799 | if (v == SEQ_START_TOKEN) | |
2800 | im = igmp_mc_get_first(seq); | |
2801 | else | |
2802 | im = igmp_mc_get_next(seq, v); | |
2803 | ++*pos; | |
2804 | return im; | |
2805 | } | |
2806 | ||
2807 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2808 | __releases(rcu) |
1da177e4 LT |
2809 | { |
2810 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2811 | |
2812 | state->in_dev = NULL; | |
1da177e4 | 2813 | state->dev = NULL; |
61fbab77 | 2814 | rcu_read_unlock(); |
1da177e4 LT |
2815 | } |
2816 | ||
2817 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2818 | { | |
2819 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2820 | seq_puts(seq, |
1da177e4 LT |
2821 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2822 | else { | |
2823 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2824 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2825 | char *querier; | |
a399a805 ED |
2826 | long delta; |
2827 | ||
1da177e4 LT |
2828 | #ifdef CONFIG_IP_MULTICAST |
2829 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2830 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2831 | "V3"; | |
2832 | #else | |
2833 | querier = "NONE"; | |
2834 | #endif | |
2835 | ||
e6b68883 | 2836 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2837 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2838 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2839 | } |
2840 | ||
a399a805 | 2841 | delta = im->timer.expires - jiffies; |
1da177e4 | 2842 | seq_printf(seq, |
338fcf98 | 2843 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2844 | im->multiaddr, im->users, |
a399a805 ED |
2845 | im->tm_running, |
2846 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2847 | im->reporter); |
2848 | } | |
2849 | return 0; | |
2850 | } | |
2851 | ||
f690808e | 2852 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2853 | .start = igmp_mc_seq_start, |
2854 | .next = igmp_mc_seq_next, | |
2855 | .stop = igmp_mc_seq_stop, | |
2856 | .show = igmp_mc_seq_show, | |
2857 | }; | |
2858 | ||
2859 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2860 | { | |
7091e728 | 2861 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2862 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2863 | } |
2864 | ||
9a32144e | 2865 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2866 | .owner = THIS_MODULE, |
2867 | .open = igmp_mc_seq_open, | |
2868 | .read = seq_read, | |
2869 | .llseek = seq_lseek, | |
7091e728 | 2870 | .release = seq_release_net, |
1da177e4 LT |
2871 | }; |
2872 | ||
2873 | struct igmp_mcf_iter_state { | |
7091e728 | 2874 | struct seq_net_private p; |
1da177e4 LT |
2875 | struct net_device *dev; |
2876 | struct in_device *idev; | |
2877 | struct ip_mc_list *im; | |
2878 | }; | |
2879 | ||
2880 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2881 | ||
2882 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2883 | { | |
7091e728 | 2884 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2885 | struct ip_sf_list *psf = NULL; |
2886 | struct ip_mc_list *im = NULL; | |
2887 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2888 | ||
7562f876 PE |
2889 | state->idev = NULL; |
2890 | state->im = NULL; | |
61fbab77 | 2891 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2892 | struct in_device *idev; |
6baff150 | 2893 | idev = __in_dev_get_rcu(state->dev); |
51456b29 | 2894 | if (unlikely(!idev)) |
1da177e4 | 2895 | continue; |
1d7138de | 2896 | im = rcu_dereference(idev->mc_list); |
00db4124 | 2897 | if (likely(im)) { |
1da177e4 LT |
2898 | spin_lock_bh(&im->lock); |
2899 | psf = im->sources; | |
00db4124 | 2900 | if (likely(psf)) { |
1da177e4 LT |
2901 | state->im = im; |
2902 | state->idev = idev; | |
2903 | break; | |
2904 | } | |
2905 | spin_unlock_bh(&im->lock); | |
2906 | } | |
1da177e4 LT |
2907 | } |
2908 | return psf; | |
2909 | } | |
2910 | ||
2911 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2912 | { | |
2913 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2914 | ||
2915 | psf = psf->sf_next; | |
2916 | while (!psf) { | |
2917 | spin_unlock_bh(&state->im->lock); | |
2918 | state->im = state->im->next; | |
2919 | while (!state->im) { | |
6baff150 | 2920 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2921 | if (!state->dev) { |
2922 | state->idev = NULL; | |
2923 | goto out; | |
2924 | } | |
6baff150 | 2925 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2926 | if (!state->idev) |
2927 | continue; | |
1d7138de | 2928 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2929 | } |
2930 | if (!state->im) | |
2931 | break; | |
2932 | spin_lock_bh(&state->im->lock); | |
2933 | psf = state->im->sources; | |
2934 | } | |
2935 | out: | |
2936 | return psf; | |
2937 | } | |
2938 | ||
2939 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2940 | { | |
2941 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2942 | if (psf) | |
2943 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2944 | --pos; | |
2945 | return pos ? NULL : psf; | |
2946 | } | |
2947 | ||
2948 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2949 | __acquires(rcu) |
1da177e4 | 2950 | { |
61fbab77 | 2951 | rcu_read_lock(); |
1da177e4 LT |
2952 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2953 | } | |
2954 | ||
2955 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2956 | { | |
2957 | struct ip_sf_list *psf; | |
2958 | if (v == SEQ_START_TOKEN) | |
2959 | psf = igmp_mcf_get_first(seq); | |
2960 | else | |
2961 | psf = igmp_mcf_get_next(seq, v); | |
2962 | ++*pos; | |
2963 | return psf; | |
2964 | } | |
2965 | ||
2966 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2967 | __releases(rcu) |
1da177e4 LT |
2968 | { |
2969 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
00db4124 | 2970 | if (likely(state->im)) { |
1da177e4 LT |
2971 | spin_unlock_bh(&state->im->lock); |
2972 | state->im = NULL; | |
2973 | } | |
1d7138de | 2974 | state->idev = NULL; |
1da177e4 | 2975 | state->dev = NULL; |
61fbab77 | 2976 | rcu_read_unlock(); |
1da177e4 LT |
2977 | } |
2978 | ||
2979 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2980 | { | |
2981 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2982 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2983 | ||
2984 | if (v == SEQ_START_TOKEN) { | |
1744bea1 | 2985 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
1da177e4 LT |
2986 | } else { |
2987 | seq_printf(seq, | |
2988 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2989 | "0x%08x %6lu %6lu\n", |
2990 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2991 | ntohl(state->im->multiaddr), |
2992 | ntohl(psf->sf_inaddr), | |
2993 | psf->sf_count[MCAST_INCLUDE], | |
2994 | psf->sf_count[MCAST_EXCLUDE]); | |
2995 | } | |
2996 | return 0; | |
2997 | } | |
2998 | ||
f690808e | 2999 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
3000 | .start = igmp_mcf_seq_start, |
3001 | .next = igmp_mcf_seq_next, | |
3002 | .stop = igmp_mcf_seq_stop, | |
3003 | .show = igmp_mcf_seq_show, | |
3004 | }; | |
3005 | ||
3006 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
3007 | { | |
7091e728 | 3008 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 3009 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
3010 | } |
3011 | ||
9a32144e | 3012 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
3013 | .owner = THIS_MODULE, |
3014 | .open = igmp_mcf_seq_open, | |
3015 | .read = seq_read, | |
3016 | .llseek = seq_lseek, | |
7091e728 | 3017 | .release = seq_release_net, |
1da177e4 LT |
3018 | }; |
3019 | ||
2c8c1e72 | 3020 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 3021 | { |
7091e728 | 3022 | struct proc_dir_entry *pde; |
93a714d6 | 3023 | int err; |
7091e728 | 3024 | |
d4beaa66 | 3025 | pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); |
7091e728 AD |
3026 | if (!pde) |
3027 | goto out_igmp; | |
d4beaa66 G |
3028 | pde = proc_create("mcfilter", S_IRUGO, net->proc_net, |
3029 | &igmp_mcf_seq_fops); | |
7091e728 AD |
3030 | if (!pde) |
3031 | goto out_mcfilter; | |
93a714d6 MC |
3032 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
3033 | SOCK_DGRAM, 0, net); | |
3034 | if (err < 0) { | |
3035 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
3036 | err); | |
3037 | goto out_sock; | |
3038 | } | |
3039 | ||
1da177e4 | 3040 | return 0; |
7091e728 | 3041 | |
93a714d6 MC |
3042 | out_sock: |
3043 | remove_proc_entry("mcfilter", net->proc_net); | |
7091e728 | 3044 | out_mcfilter: |
ece31ffd | 3045 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
3046 | out_igmp: |
3047 | return -ENOMEM; | |
3048 | } | |
3049 | ||
2c8c1e72 | 3050 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 3051 | { |
ece31ffd G |
3052 | remove_proc_entry("mcfilter", net->proc_net); |
3053 | remove_proc_entry("igmp", net->proc_net); | |
93a714d6 | 3054 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
7091e728 AD |
3055 | } |
3056 | ||
3057 | static struct pernet_operations igmp_net_ops = { | |
3058 | .init = igmp_net_init, | |
3059 | .exit = igmp_net_exit, | |
3060 | }; | |
72c1d3bd | 3061 | #endif |
7091e728 | 3062 | |
4aa5dee4 JP |
3063 | static int igmp_netdev_event(struct notifier_block *this, |
3064 | unsigned long event, void *ptr) | |
3065 | { | |
3066 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3067 | struct in_device *in_dev; | |
3068 | ||
3069 | switch (event) { | |
3070 | case NETDEV_RESEND_IGMP: | |
3071 | in_dev = __in_dev_get_rtnl(dev); | |
3072 | if (in_dev) | |
3073 | ip_mc_rejoin_groups(in_dev); | |
3074 | break; | |
3075 | default: | |
3076 | break; | |
3077 | } | |
3078 | return NOTIFY_DONE; | |
3079 | } | |
3080 | ||
3081 | static struct notifier_block igmp_notifier = { | |
3082 | .notifier_call = igmp_netdev_event, | |
3083 | }; | |
3084 | ||
72c1d3bd | 3085 | int __init igmp_mc_init(void) |
7091e728 | 3086 | { |
72c1d3bd | 3087 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
3088 | int err; |
3089 | ||
3090 | err = register_pernet_subsys(&igmp_net_ops); | |
3091 | if (err) | |
3092 | return err; | |
3093 | err = register_netdevice_notifier(&igmp_notifier); | |
3094 | if (err) | |
3095 | goto reg_notif_fail; | |
3096 | return 0; | |
3097 | ||
3098 | reg_notif_fail: | |
3099 | unregister_pernet_subsys(&igmp_net_ops); | |
3100 | return err; | |
72c1d3bd WC |
3101 | #else |
3102 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 3103 | #endif |
72c1d3bd | 3104 | } |