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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
1da177e4 | 75 | #include <asm/uaccess.h> |
1da177e4 LT |
76 | #include <linux/types.h> |
77 | #include <linux/kernel.h> | |
78 | #include <linux/jiffies.h> | |
79 | #include <linux/string.h> | |
80 | #include <linux/socket.h> | |
81 | #include <linux/sockios.h> | |
82 | #include <linux/in.h> | |
83 | #include <linux/inet.h> | |
84 | #include <linux/netdevice.h> | |
85 | #include <linux/skbuff.h> | |
86 | #include <linux/inetdevice.h> | |
87 | #include <linux/igmp.h> | |
88 | #include <linux/if_arp.h> | |
89 | #include <linux/rtnetlink.h> | |
90 | #include <linux/times.h> | |
9d4a0314 | 91 | #include <linux/pkt_sched.h> |
14c85021 | 92 | |
457c4cbc | 93 | #include <net/net_namespace.h> |
14c85021 | 94 | #include <net/arp.h> |
1da177e4 LT |
95 | #include <net/ip.h> |
96 | #include <net/protocol.h> | |
97 | #include <net/route.h> | |
98 | #include <net/sock.h> | |
99 | #include <net/checksum.h> | |
93a714d6 | 100 | #include <net/inet_common.h> |
1da177e4 LT |
101 | #include <linux/netfilter_ipv4.h> |
102 | #ifdef CONFIG_IP_MROUTE | |
103 | #include <linux/mroute.h> | |
104 | #endif | |
105 | #ifdef CONFIG_PROC_FS | |
106 | #include <linux/proc_fs.h> | |
107 | #include <linux/seq_file.h> | |
108 | #endif | |
109 | ||
1da177e4 LT |
110 | #define IP_MAX_MSF 10 |
111 | ||
df2cf4a7 PD |
112 | /* IGMP reports for link-local multicast groups are enabled by default */ |
113 | int sysctl_igmp_llm_reports __read_mostly = 1; | |
114 | ||
1da177e4 LT |
115 | #ifdef CONFIG_IP_MULTICAST |
116 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
117 | ||
436f7c20 FF |
118 | #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ) |
119 | #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ) | |
120 | #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) | |
121 | #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) | |
122 | #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) | |
123 | #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2 | |
1da177e4 LT |
124 | |
125 | ||
436f7c20 | 126 | #define IGMP_INITIAL_REPORT_DELAY (1) |
1da177e4 | 127 | |
436f7c20 | 128 | /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! |
1da177e4 LT |
129 | * IGMP specs require to report membership immediately after |
130 | * joining a group, but we delay the first report by a | |
131 | * small interval. It seems more natural and still does not | |
132 | * contradict to specs provided this delay is small enough. | |
133 | */ | |
134 | ||
42f811b8 | 135 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 136 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
137 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
138 | ((in_dev)->mr_v1_seen && \ | |
139 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
140 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 141 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
142 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
143 | ((in_dev)->mr_v2_seen && \ | |
144 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 | 145 | |
cab70040 WM |
146 | static int unsolicited_report_interval(struct in_device *in_dev) |
147 | { | |
2690048c WM |
148 | int interval_ms, interval_jiffies; |
149 | ||
cab70040 | 150 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
2690048c WM |
151 | interval_ms = IN_DEV_CONF_GET( |
152 | in_dev, | |
153 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
cab70040 | 154 | else /* v3 */ |
2690048c WM |
155 | interval_ms = IN_DEV_CONF_GET( |
156 | in_dev, | |
157 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
158 | ||
159 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
160 | ||
161 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
162 | * we always return a positive value. | |
163 | */ | |
164 | if (interval_jiffies <= 0) | |
165 | interval_jiffies = 1; | |
166 | return interval_jiffies; | |
cab70040 WM |
167 | } |
168 | ||
1da177e4 | 169 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
63007727 | 170 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); |
1da177e4 LT |
171 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
172 | static int sf_setstate(struct ip_mc_list *pmc); | |
173 | static void sf_markstate(struct ip_mc_list *pmc); | |
174 | #endif | |
175 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
176 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
177 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
178 | |
179 | static void ip_ma_put(struct ip_mc_list *im) | |
180 | { | |
181 | if (atomic_dec_and_test(&im->refcnt)) { | |
182 | in_dev_put(im->interface); | |
42ea299d | 183 | kfree_rcu(im, rcu); |
1da177e4 LT |
184 | } |
185 | } | |
186 | ||
d9aa9380 DM |
187 | #define for_each_pmc_rcu(in_dev, pmc) \ |
188 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
189 | pmc != NULL; \ | |
190 | pmc = rcu_dereference(pmc->next_rcu)) | |
191 | ||
192 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
193 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
194 | pmc != NULL; \ | |
195 | pmc = rtnl_dereference(pmc->next_rcu)) | |
196 | ||
1da177e4 LT |
197 | #ifdef CONFIG_IP_MULTICAST |
198 | ||
199 | /* | |
200 | * Timer management | |
201 | */ | |
202 | ||
1d7138de | 203 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
204 | { |
205 | spin_lock_bh(&im->lock); | |
206 | if (del_timer(&im->timer)) | |
207 | atomic_dec(&im->refcnt); | |
a7e9ff73 | 208 | im->tm_running = 0; |
1da177e4 LT |
209 | im->reporter = 0; |
210 | im->unsolicit_count = 0; | |
211 | spin_unlock_bh(&im->lock); | |
212 | } | |
213 | ||
214 | /* It must be called with locked im->lock */ | |
215 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
216 | { | |
63862b5b | 217 | int tv = prandom_u32() % max_delay; |
1da177e4 | 218 | |
a7e9ff73 | 219 | im->tm_running = 1; |
1da177e4 LT |
220 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
221 | atomic_inc(&im->refcnt); | |
222 | } | |
223 | ||
224 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
225 | { | |
63862b5b | 226 | int tv = prandom_u32() % in_dev->mr_maxdelay; |
1da177e4 LT |
227 | |
228 | in_dev->mr_gq_running = 1; | |
229 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
230 | in_dev_hold(in_dev); | |
231 | } | |
232 | ||
233 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
234 | { | |
63862b5b | 235 | int tv = prandom_u32() % delay; |
1da177e4 LT |
236 | |
237 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
238 | in_dev_hold(in_dev); | |
239 | } | |
240 | ||
241 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
242 | { | |
243 | spin_lock_bh(&im->lock); | |
244 | im->unsolicit_count = 0; | |
245 | if (del_timer(&im->timer)) { | |
246 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
247 | add_timer(&im->timer); | |
a7e9ff73 | 248 | im->tm_running = 1; |
1da177e4 LT |
249 | spin_unlock_bh(&im->lock); |
250 | return; | |
251 | } | |
252 | atomic_dec(&im->refcnt); | |
253 | } | |
254 | igmp_start_timer(im, max_delay); | |
255 | spin_unlock_bh(&im->lock); | |
256 | } | |
257 | ||
258 | ||
259 | /* | |
260 | * Send an IGMP report. | |
261 | */ | |
262 | ||
263 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
264 | ||
265 | ||
266 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
267 | int gdeleted, int sdeleted) | |
268 | { | |
269 | switch (type) { | |
270 | case IGMPV3_MODE_IS_INCLUDE: | |
271 | case IGMPV3_MODE_IS_EXCLUDE: | |
272 | if (gdeleted || sdeleted) | |
273 | return 0; | |
ad12583f DS |
274 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
275 | if (pmc->sfmode == MCAST_INCLUDE) | |
276 | return 1; | |
277 | /* don't include if this source is excluded | |
278 | * in all filters | |
279 | */ | |
280 | if (psf->sf_count[MCAST_INCLUDE]) | |
281 | return type == IGMPV3_MODE_IS_INCLUDE; | |
282 | return pmc->sfcount[MCAST_EXCLUDE] == | |
283 | psf->sf_count[MCAST_EXCLUDE]; | |
284 | } | |
285 | return 0; | |
1da177e4 LT |
286 | case IGMPV3_CHANGE_TO_INCLUDE: |
287 | if (gdeleted || sdeleted) | |
288 | return 0; | |
289 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
290 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
291 | if (gdeleted || sdeleted) | |
292 | return 0; | |
293 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
294 | psf->sf_count[MCAST_INCLUDE]) | |
295 | return 0; | |
296 | return pmc->sfcount[MCAST_EXCLUDE] == | |
297 | psf->sf_count[MCAST_EXCLUDE]; | |
298 | case IGMPV3_ALLOW_NEW_SOURCES: | |
299 | if (gdeleted || !psf->sf_crcount) | |
300 | return 0; | |
301 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
302 | case IGMPV3_BLOCK_OLD_SOURCES: | |
303 | if (pmc->sfmode == MCAST_INCLUDE) | |
304 | return gdeleted || (psf->sf_crcount && sdeleted); | |
305 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
306 | } | |
307 | return 0; | |
308 | } | |
309 | ||
310 | static int | |
311 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
312 | { | |
313 | struct ip_sf_list *psf; | |
314 | int scount = 0; | |
315 | ||
c71151f0 | 316 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
317 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
318 | continue; | |
319 | scount++; | |
320 | } | |
321 | return scount; | |
322 | } | |
323 | ||
4c672e4b | 324 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
1da177e4 LT |
325 | { |
326 | struct sk_buff *skb; | |
327 | struct rtable *rt; | |
328 | struct iphdr *pip; | |
329 | struct igmpv3_report *pig; | |
877acedc | 330 | struct net *net = dev_net(dev); |
31e4543d | 331 | struct flowi4 fl4; |
66088243 HX |
332 | int hlen = LL_RESERVED_SPACE(dev); |
333 | int tlen = dev->needed_tailroom; | |
4c672e4b | 334 | unsigned int size = mtu; |
1da177e4 | 335 | |
57e1ab6e | 336 | while (1) { |
66088243 | 337 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
338 | GFP_ATOMIC | __GFP_NOWARN); |
339 | if (skb) | |
340 | break; | |
341 | size >>= 1; | |
342 | if (size < 256) | |
343 | return NULL; | |
344 | } | |
9d4a0314 | 345 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 346 | |
31e4543d | 347 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
348 | 0, 0, |
349 | IPPROTO_IGMP, 0, dev->ifindex); | |
350 | if (IS_ERR(rt)) { | |
351 | kfree_skb(skb); | |
352 | return NULL; | |
1da177e4 | 353 | } |
1da177e4 | 354 | |
d8d1f30b | 355 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
356 | skb->dev = dev; |
357 | ||
4c672e4b DB |
358 | skb->reserved_tailroom = skb_end_offset(skb) - |
359 | min(mtu, skb_end_offset(skb)); | |
66088243 | 360 | skb_reserve(skb, hlen); |
1da177e4 | 361 | |
7e28ecc2 | 362 | skb_reset_network_header(skb); |
eddc9ec5 | 363 | pip = ip_hdr(skb); |
7e28ecc2 | 364 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
365 | |
366 | pip->version = 4; | |
367 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
368 | pip->tos = 0xc0; | |
369 | pip->frag_off = htons(IP_DF); | |
370 | pip->ttl = 1; | |
492f64ce DM |
371 | pip->daddr = fl4.daddr; |
372 | pip->saddr = fl4.saddr; | |
1da177e4 LT |
373 | pip->protocol = IPPROTO_IGMP; |
374 | pip->tot_len = 0; /* filled in later */ | |
b6a7719a | 375 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
376 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
377 | ((u8 *)&pip[1])[1] = 4; | |
378 | ((u8 *)&pip[1])[2] = 0; | |
379 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 380 | |
b0e380b1 | 381 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 382 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 383 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
384 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
385 | pig->resv1 = 0; | |
386 | pig->csum = 0; | |
387 | pig->resv2 = 0; | |
388 | pig->ngrec = 0; | |
389 | return skb; | |
390 | } | |
391 | ||
392 | static int igmpv3_sendpack(struct sk_buff *skb) | |
393 | { | |
d9edf9e2 | 394 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 395 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 396 | |
d9edf9e2 | 397 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 398 | |
33224b16 | 399 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
1da177e4 LT |
400 | } |
401 | ||
402 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
403 | { | |
a7e9ff73 | 404 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
405 | } |
406 | ||
407 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
408 | int type, struct igmpv3_grec **ppgr) | |
409 | { | |
410 | struct net_device *dev = pmc->interface->dev; | |
411 | struct igmpv3_report *pih; | |
412 | struct igmpv3_grec *pgr; | |
413 | ||
414 | if (!skb) | |
415 | skb = igmpv3_newpack(dev, dev->mtu); | |
416 | if (!skb) | |
417 | return NULL; | |
418 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
419 | pgr->grec_type = type; | |
420 | pgr->grec_auxwords = 0; | |
421 | pgr->grec_nsrcs = 0; | |
422 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 423 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
424 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
425 | *ppgr = pgr; | |
426 | return skb; | |
427 | } | |
428 | ||
4c672e4b | 429 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
430 | |
431 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
432 | int type, int gdeleted, int sdeleted) | |
433 | { | |
434 | struct net_device *dev = pmc->interface->dev; | |
435 | struct igmpv3_report *pih; | |
436 | struct igmpv3_grec *pgr = NULL; | |
437 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 438 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
439 | |
440 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
441 | return skb; | |
df2cf4a7 PD |
442 | if (ipv4_is_local_multicast(pmc->multiaddr) && !sysctl_igmp_llm_reports) |
443 | return skb; | |
1da177e4 LT |
444 | |
445 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
446 | type == IGMPV3_MODE_IS_EXCLUDE; | |
447 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
448 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
449 | ||
ad12583f DS |
450 | stotal = scount = 0; |
451 | ||
1da177e4 LT |
452 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
453 | ||
ad12583f DS |
454 | if (!*psf_list) |
455 | goto empty_source; | |
456 | ||
d9edf9e2 | 457 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
458 | |
459 | /* EX and TO_EX get a fresh packet, if needed */ | |
460 | if (truncate) { | |
461 | if (pih && pih->ngrec && | |
462 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
463 | if (skb) | |
464 | igmpv3_sendpack(skb); | |
465 | skb = igmpv3_newpack(dev, dev->mtu); | |
466 | } | |
467 | } | |
468 | first = 1; | |
1da177e4 | 469 | psf_prev = NULL; |
c71151f0 | 470 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 471 | __be32 *psrc; |
1da177e4 LT |
472 | |
473 | psf_next = psf->sf_next; | |
474 | ||
475 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
476 | psf_prev = psf; | |
477 | continue; | |
478 | } | |
479 | ||
480 | /* clear marks on query responses */ | |
481 | if (isquery) | |
482 | psf->sf_gsresp = 0; | |
483 | ||
63007727 | 484 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
485 | first*sizeof(struct igmpv3_grec)) { |
486 | if (truncate && !first) | |
487 | break; /* truncate these */ | |
488 | if (pgr) | |
489 | pgr->grec_nsrcs = htons(scount); | |
490 | if (skb) | |
491 | igmpv3_sendpack(skb); | |
492 | skb = igmpv3_newpack(dev, dev->mtu); | |
493 | first = 1; | |
494 | scount = 0; | |
495 | } | |
496 | if (first) { | |
497 | skb = add_grhead(skb, pmc, type, &pgr); | |
498 | first = 0; | |
499 | } | |
cc63f70b AD |
500 | if (!skb) |
501 | return NULL; | |
63007727 | 502 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 503 | *psrc = psf->sf_inaddr; |
ad12583f | 504 | scount++; stotal++; |
1da177e4 LT |
505 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
506 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
507 | psf->sf_crcount--; | |
508 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
509 | if (psf_prev) | |
510 | psf_prev->sf_next = psf->sf_next; | |
511 | else | |
512 | *psf_list = psf->sf_next; | |
513 | kfree(psf); | |
514 | continue; | |
515 | } | |
516 | } | |
517 | psf_prev = psf; | |
518 | } | |
ad12583f DS |
519 | |
520 | empty_source: | |
521 | if (!stotal) { | |
522 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
523 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
524 | return skb; | |
525 | if (pmc->crcount || isquery) { | |
526 | /* make sure we have room for group header */ | |
c71151f0 | 527 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
528 | igmpv3_sendpack(skb); |
529 | skb = NULL; /* add_grhead will get a new one */ | |
530 | } | |
531 | skb = add_grhead(skb, pmc, type, &pgr); | |
532 | } | |
533 | } | |
1da177e4 LT |
534 | if (pgr) |
535 | pgr->grec_nsrcs = htons(scount); | |
536 | ||
537 | if (isquery) | |
538 | pmc->gsquery = 0; /* clear query state on report */ | |
539 | return skb; | |
540 | } | |
541 | ||
542 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
543 | { | |
544 | struct sk_buff *skb = NULL; | |
545 | int type; | |
546 | ||
547 | if (!pmc) { | |
1d7138de ED |
548 | rcu_read_lock(); |
549 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
550 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
551 | continue; | |
df2cf4a7 PD |
552 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
553 | !sysctl_igmp_llm_reports) | |
554 | continue; | |
1da177e4 LT |
555 | spin_lock_bh(&pmc->lock); |
556 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
557 | type = IGMPV3_MODE_IS_EXCLUDE; | |
558 | else | |
559 | type = IGMPV3_MODE_IS_INCLUDE; | |
560 | skb = add_grec(skb, pmc, type, 0, 0); | |
561 | spin_unlock_bh(&pmc->lock); | |
562 | } | |
1d7138de | 563 | rcu_read_unlock(); |
1da177e4 LT |
564 | } else { |
565 | spin_lock_bh(&pmc->lock); | |
566 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
567 | type = IGMPV3_MODE_IS_EXCLUDE; | |
568 | else | |
569 | type = IGMPV3_MODE_IS_INCLUDE; | |
570 | skb = add_grec(skb, pmc, type, 0, 0); | |
571 | spin_unlock_bh(&pmc->lock); | |
572 | } | |
573 | if (!skb) | |
574 | return 0; | |
575 | return igmpv3_sendpack(skb); | |
576 | } | |
577 | ||
578 | /* | |
579 | * remove zero-count source records from a source filter list | |
580 | */ | |
581 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
582 | { | |
583 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
584 | ||
585 | psf_prev = NULL; | |
c71151f0 | 586 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
587 | psf_next = psf->sf_next; |
588 | if (psf->sf_crcount == 0) { | |
589 | if (psf_prev) | |
590 | psf_prev->sf_next = psf->sf_next; | |
591 | else | |
592 | *ppsf = psf->sf_next; | |
593 | kfree(psf); | |
594 | } else | |
595 | psf_prev = psf; | |
596 | } | |
597 | } | |
598 | ||
599 | static void igmpv3_send_cr(struct in_device *in_dev) | |
600 | { | |
601 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
602 | struct sk_buff *skb = NULL; | |
603 | int type, dtype; | |
604 | ||
1d7138de | 605 | rcu_read_lock(); |
1da177e4 LT |
606 | spin_lock_bh(&in_dev->mc_tomb_lock); |
607 | ||
608 | /* deleted MCA's */ | |
609 | pmc_prev = NULL; | |
c71151f0 | 610 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
611 | pmc_next = pmc->next; |
612 | if (pmc->sfmode == MCAST_INCLUDE) { | |
613 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
614 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
615 | skb = add_grec(skb, pmc, type, 1, 0); | |
616 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
617 | } | |
618 | if (pmc->crcount) { | |
1da177e4 LT |
619 | if (pmc->sfmode == MCAST_EXCLUDE) { |
620 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
621 | skb = add_grec(skb, pmc, type, 1, 0); | |
622 | } | |
ad12583f | 623 | pmc->crcount--; |
1da177e4 LT |
624 | if (pmc->crcount == 0) { |
625 | igmpv3_clear_zeros(&pmc->tomb); | |
626 | igmpv3_clear_zeros(&pmc->sources); | |
627 | } | |
628 | } | |
629 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
630 | if (pmc_prev) | |
631 | pmc_prev->next = pmc_next; | |
632 | else | |
633 | in_dev->mc_tomb = pmc_next; | |
634 | in_dev_put(pmc->interface); | |
635 | kfree(pmc); | |
636 | } else | |
637 | pmc_prev = pmc; | |
638 | } | |
639 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
640 | ||
641 | /* change recs */ | |
1d7138de | 642 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
643 | spin_lock_bh(&pmc->lock); |
644 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
645 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
646 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
647 | } else { | |
648 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
649 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
650 | } | |
651 | skb = add_grec(skb, pmc, type, 0, 0); | |
652 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
653 | ||
654 | /* filter mode changes */ | |
655 | if (pmc->crcount) { | |
1da177e4 LT |
656 | if (pmc->sfmode == MCAST_EXCLUDE) |
657 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
658 | else | |
659 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
660 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 661 | pmc->crcount--; |
1da177e4 LT |
662 | } |
663 | spin_unlock_bh(&pmc->lock); | |
664 | } | |
1d7138de | 665 | rcu_read_unlock(); |
1da177e4 LT |
666 | |
667 | if (!skb) | |
668 | return; | |
669 | (void) igmpv3_sendpack(skb); | |
670 | } | |
671 | ||
672 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
673 | int type) | |
674 | { | |
675 | struct sk_buff *skb; | |
676 | struct iphdr *iph; | |
677 | struct igmphdr *ih; | |
678 | struct rtable *rt; | |
679 | struct net_device *dev = in_dev->dev; | |
877acedc | 680 | struct net *net = dev_net(dev); |
63007727 | 681 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 682 | struct flowi4 fl4; |
63007727 | 683 | __be32 dst; |
66088243 | 684 | int hlen, tlen; |
1da177e4 LT |
685 | |
686 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
687 | return igmpv3_send_report(in_dev, pmc); | |
df2cf4a7 PD |
688 | |
689 | if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports) | |
690 | return 0; | |
691 | ||
692 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
1da177e4 LT |
693 | dst = IGMP_ALL_ROUTER; |
694 | else | |
695 | dst = group; | |
696 | ||
31e4543d | 697 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
698 | 0, 0, |
699 | IPPROTO_IGMP, 0, dev->ifindex); | |
700 | if (IS_ERR(rt)) | |
701 | return -1; | |
702 | ||
66088243 HX |
703 | hlen = LL_RESERVED_SPACE(dev); |
704 | tlen = dev->needed_tailroom; | |
705 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
51456b29 | 706 | if (!skb) { |
1da177e4 LT |
707 | ip_rt_put(rt); |
708 | return -1; | |
709 | } | |
9d4a0314 | 710 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 711 | |
d8d1f30b | 712 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 713 | |
66088243 | 714 | skb_reserve(skb, hlen); |
1da177e4 | 715 | |
7e28ecc2 | 716 | skb_reset_network_header(skb); |
eddc9ec5 | 717 | iph = ip_hdr(skb); |
7e28ecc2 | 718 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
719 | |
720 | iph->version = 4; | |
721 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
722 | iph->tos = 0xc0; | |
723 | iph->frag_off = htons(IP_DF); | |
724 | iph->ttl = 1; | |
725 | iph->daddr = dst; | |
492f64ce | 726 | iph->saddr = fl4.saddr; |
1da177e4 | 727 | iph->protocol = IPPROTO_IGMP; |
b6a7719a | 728 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
729 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
730 | ((u8 *)&iph[1])[1] = 4; | |
731 | ((u8 *)&iph[1])[2] = 0; | |
732 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 LT |
733 | |
734 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
735 | ih->type = type; |
736 | ih->code = 0; | |
737 | ih->csum = 0; | |
738 | ih->group = group; | |
739 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 740 | |
33224b16 | 741 | return ip_local_out(net, skb->sk, skb); |
1da177e4 LT |
742 | } |
743 | ||
744 | static void igmp_gq_timer_expire(unsigned long data) | |
745 | { | |
746 | struct in_device *in_dev = (struct in_device *)data; | |
747 | ||
748 | in_dev->mr_gq_running = 0; | |
749 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 750 | in_dev_put(in_dev); |
1da177e4 LT |
751 | } |
752 | ||
753 | static void igmp_ifc_timer_expire(unsigned long data) | |
754 | { | |
755 | struct in_device *in_dev = (struct in_device *)data; | |
756 | ||
757 | igmpv3_send_cr(in_dev); | |
758 | if (in_dev->mr_ifc_count) { | |
759 | in_dev->mr_ifc_count--; | |
cab70040 WM |
760 | igmp_ifc_start_timer(in_dev, |
761 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 762 | } |
e2401654 | 763 | in_dev_put(in_dev); |
1da177e4 LT |
764 | } |
765 | ||
766 | static void igmp_ifc_event(struct in_device *in_dev) | |
767 | { | |
768 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
769 | return; | |
a9fe8e29 | 770 | in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
771 | igmp_ifc_start_timer(in_dev, 1); |
772 | } | |
773 | ||
774 | ||
775 | static void igmp_timer_expire(unsigned long data) | |
776 | { | |
c71151f0 | 777 | struct ip_mc_list *im = (struct ip_mc_list *)data; |
1da177e4 LT |
778 | struct in_device *in_dev = im->interface; |
779 | ||
780 | spin_lock(&im->lock); | |
a7e9ff73 | 781 | im->tm_running = 0; |
1da177e4 LT |
782 | |
783 | if (im->unsolicit_count) { | |
784 | im->unsolicit_count--; | |
cab70040 | 785 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
1da177e4 LT |
786 | } |
787 | im->reporter = 1; | |
788 | spin_unlock(&im->lock); | |
789 | ||
790 | if (IGMP_V1_SEEN(in_dev)) | |
791 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
792 | else if (IGMP_V2_SEEN(in_dev)) | |
793 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
794 | else | |
795 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
796 | ||
797 | ip_ma_put(im); | |
798 | } | |
799 | ||
ad12583f | 800 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 801 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
802 | { |
803 | struct ip_sf_list *psf; | |
804 | int i, scount; | |
805 | ||
ad12583f | 806 | scount = 0; |
c71151f0 | 807 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
808 | if (scount == nsrcs) |
809 | break; | |
c71151f0 | 810 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 811 | /* skip inactive filters */ |
e05c4ad3 | 812 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
813 | pmc->sfcount[MCAST_EXCLUDE] != |
814 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 815 | break; |
ad12583f DS |
816 | if (srcs[i] == psf->sf_inaddr) { |
817 | scount++; | |
818 | break; | |
819 | } | |
820 | } | |
821 | } | |
822 | pmc->gsquery = 0; | |
823 | if (scount == nsrcs) /* all sources excluded */ | |
824 | return 0; | |
825 | return 1; | |
826 | } | |
827 | ||
ea4d9e72 | 828 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
829 | { |
830 | struct ip_sf_list *psf; | |
831 | int i, scount; | |
832 | ||
833 | if (pmc->sfmode == MCAST_EXCLUDE) | |
834 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
835 | ||
836 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 837 | scount = 0; |
c71151f0 | 838 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
839 | if (scount == nsrcs) |
840 | break; | |
c71151f0 | 841 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
842 | if (srcs[i] == psf->sf_inaddr) { |
843 | psf->sf_gsresp = 1; | |
844 | scount++; | |
845 | break; | |
846 | } | |
847 | } | |
ad12583f DS |
848 | if (!scount) { |
849 | pmc->gsquery = 0; | |
850 | return 0; | |
851 | } | |
852 | pmc->gsquery = 1; | |
853 | return 1; | |
1da177e4 LT |
854 | } |
855 | ||
d679c532 ED |
856 | /* return true if packet was dropped */ |
857 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
858 | { |
859 | struct ip_mc_list *im; | |
860 | ||
861 | /* Timers are only set for non-local groups */ | |
862 | ||
863 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 864 | return false; |
df2cf4a7 PD |
865 | if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports) |
866 | return false; | |
1da177e4 | 867 | |
1d7138de ED |
868 | rcu_read_lock(); |
869 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
870 | if (im->multiaddr == group) { |
871 | igmp_stop_timer(im); | |
872 | break; | |
873 | } | |
874 | } | |
1d7138de | 875 | rcu_read_unlock(); |
d679c532 | 876 | return false; |
1da177e4 LT |
877 | } |
878 | ||
d679c532 ED |
879 | /* return true if packet was dropped */ |
880 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
881 | int len) |
882 | { | |
d9edf9e2 ACM |
883 | struct igmphdr *ih = igmp_hdr(skb); |
884 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 885 | struct ip_mc_list *im; |
63007727 | 886 | __be32 group = ih->group; |
1da177e4 LT |
887 | int max_delay; |
888 | int mark = 0; | |
889 | ||
890 | ||
5b7c8406 | 891 | if (len == 8) { |
1da177e4 LT |
892 | if (ih->code == 0) { |
893 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 894 | |
436f7c20 | 895 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
1da177e4 | 896 | in_dev->mr_v1_seen = jiffies + |
436f7c20 | 897 | IGMP_V1_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
898 | group = 0; |
899 | } else { | |
900 | /* v2 router present */ | |
901 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
902 | in_dev->mr_v2_seen = jiffies + | |
436f7c20 | 903 | IGMP_V2_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
904 | } |
905 | /* cancel the interface change timer */ | |
906 | in_dev->mr_ifc_count = 0; | |
907 | if (del_timer(&in_dev->mr_ifc_timer)) | |
908 | __in_dev_put(in_dev); | |
909 | /* clear deleted report items */ | |
910 | igmpv3_clear_delrec(in_dev); | |
911 | } else if (len < 12) { | |
d679c532 | 912 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
913 | } else if (IGMP_V1_SEEN(in_dev)) { |
914 | /* This is a v3 query with v1 queriers present */ | |
436f7c20 | 915 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
5b7c8406 DS |
916 | group = 0; |
917 | } else if (IGMP_V2_SEEN(in_dev)) { | |
918 | /* this is a v3 query with v2 queriers present; | |
919 | * Interpretation of the max_delay code is problematic here. | |
920 | * A real v2 host would use ih_code directly, while v3 has a | |
921 | * different encoding. We use the v3 encoding as more likely | |
922 | * to be intended in a v3 query. | |
923 | */ | |
924 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
925 | if (!max_delay) |
926 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
927 | } else { /* v3 */ |
928 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 929 | return true; |
e905a9ed | 930 | |
d9edf9e2 | 931 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 932 | if (ih3->nsrcs) { |
e905a9ed | 933 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 934 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 935 | return true; |
d9edf9e2 | 936 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
937 | } |
938 | ||
939 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
940 | if (!max_delay) | |
941 | max_delay = 1; /* can't mod w/ 0 */ | |
942 | in_dev->mr_maxdelay = max_delay; | |
943 | if (ih3->qrv) | |
944 | in_dev->mr_qrv = ih3->qrv; | |
945 | if (!group) { /* general query */ | |
946 | if (ih3->nsrcs) | |
b47bd8d2 | 947 | return true; /* no sources allowed */ |
1da177e4 | 948 | igmp_gq_start_timer(in_dev); |
d679c532 | 949 | return false; |
1da177e4 LT |
950 | } |
951 | /* mark sources to include, if group & source-specific */ | |
952 | mark = ih3->nsrcs != 0; | |
953 | } | |
954 | ||
955 | /* | |
956 | * - Start the timers in all of our membership records | |
957 | * that the query applies to for the interface on | |
958 | * which the query arrived excl. those that belong | |
959 | * to a "local" group (224.0.0.X) | |
960 | * - For timers already running check if they need to | |
961 | * be reset. | |
962 | * - Use the igmp->igmp_code field as the maximum | |
963 | * delay possible | |
964 | */ | |
1d7138de ED |
965 | rcu_read_lock(); |
966 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
967 | int changed; |
968 | ||
1da177e4 LT |
969 | if (group && group != im->multiaddr) |
970 | continue; | |
971 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
972 | continue; | |
df2cf4a7 PD |
973 | if (ipv4_is_local_multicast(im->multiaddr) && |
974 | !sysctl_igmp_llm_reports) | |
975 | continue; | |
1da177e4 LT |
976 | spin_lock_bh(&im->lock); |
977 | if (im->tm_running) | |
978 | im->gsquery = im->gsquery && mark; | |
979 | else | |
980 | im->gsquery = mark; | |
ad12583f | 981 | changed = !im->gsquery || |
e905a9ed | 982 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 983 | spin_unlock_bh(&im->lock); |
ad12583f DS |
984 | if (changed) |
985 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 986 | } |
1d7138de | 987 | rcu_read_unlock(); |
d679c532 | 988 | return false; |
1da177e4 LT |
989 | } |
990 | ||
9a57a9d2 | 991 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
992 | int igmp_rcv(struct sk_buff *skb) |
993 | { | |
994 | /* This basically follows the spec line by line -- see RFC1112 */ | |
995 | struct igmphdr *ih; | |
9a57a9d2 | 996 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 | 997 | int len = skb->len; |
d679c532 | 998 | bool dropped = true; |
1da177e4 | 999 | |
51456b29 | 1000 | if (!in_dev) |
cd557bc1 | 1001 | goto drop; |
1da177e4 | 1002 | |
fb286bb2 | 1003 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 1004 | goto drop; |
fb286bb2 | 1005 | |
de08dc1a TH |
1006 | if (skb_checksum_simple_validate(skb)) |
1007 | goto drop; | |
1da177e4 | 1008 | |
d9edf9e2 | 1009 | ih = igmp_hdr(skb); |
1da177e4 LT |
1010 | switch (ih->type) { |
1011 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 1012 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
1013 | break; |
1014 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1015 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 1016 | /* Is it our report looped back? */ |
c7537967 | 1017 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1018 | break; |
24c69275 DS |
1019 | /* don't rely on MC router hearing unicast reports */ |
1020 | if (skb->pkt_type == PACKET_MULTICAST || | |
1021 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1022 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1023 | break; |
1024 | case IGMP_PIM: | |
1025 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1026 | return pim_rcv_v1(skb); |
1027 | #endif | |
c6b471e6 | 1028 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1029 | case IGMP_DVMRP: |
1030 | case IGMP_TRACE: | |
1031 | case IGMP_HOST_LEAVE_MESSAGE: | |
1032 | case IGMP_MTRACE: | |
1033 | case IGMP_MTRACE_RESP: | |
1034 | break; | |
1035 | default: | |
dd1c1853 | 1036 | break; |
1da177e4 | 1037 | } |
fb286bb2 | 1038 | |
cd557bc1 | 1039 | drop: |
d679c532 ED |
1040 | if (dropped) |
1041 | kfree_skb(skb); | |
1042 | else | |
1043 | consume_skb(skb); | |
1da177e4 LT |
1044 | return 0; |
1045 | } | |
1046 | ||
1047 | #endif | |
1048 | ||
1049 | ||
1050 | /* | |
1051 | * Add a filter to a device | |
1052 | */ | |
1053 | ||
63007727 | 1054 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1055 | { |
1056 | char buf[MAX_ADDR_LEN]; | |
1057 | struct net_device *dev = in_dev->dev; | |
1058 | ||
1059 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1060 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1061 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1062 | routine. Something sort of: |
1063 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1064 | --ANK | |
1065 | */ | |
1066 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1067 | dev_mc_add(dev, buf); |
1da177e4 LT |
1068 | } |
1069 | ||
1070 | /* | |
1071 | * Remove a filter from a device | |
1072 | */ | |
1073 | ||
63007727 | 1074 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1075 | { |
1076 | char buf[MAX_ADDR_LEN]; | |
1077 | struct net_device *dev = in_dev->dev; | |
1078 | ||
1079 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1080 | dev_mc_del(dev, buf); |
1da177e4 LT |
1081 | } |
1082 | ||
1083 | #ifdef CONFIG_IP_MULTICAST | |
1084 | /* | |
1085 | * deleted ip_mc_list manipulation | |
1086 | */ | |
1087 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1088 | { | |
1089 | struct ip_mc_list *pmc; | |
1090 | ||
1091 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1092 | * are actually used. In particular, the refcnt and users are not | |
1093 | * used for management of the delete list. Using the same structure | |
1094 | * for deleted items allows change reports to use common code with | |
1095 | * non-deleted or query-response MCA's. | |
1096 | */ | |
0da974f4 | 1097 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1098 | if (!pmc) |
1099 | return; | |
1da177e4 LT |
1100 | spin_lock_bh(&im->lock); |
1101 | pmc->interface = im->interface; | |
1102 | in_dev_hold(in_dev); | |
1103 | pmc->multiaddr = im->multiaddr; | |
a9fe8e29 | 1104 | pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
1105 | pmc->sfmode = im->sfmode; |
1106 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1107 | struct ip_sf_list *psf; | |
1108 | ||
1109 | pmc->tomb = im->tomb; | |
1110 | pmc->sources = im->sources; | |
1111 | im->tomb = im->sources = NULL; | |
c71151f0 | 1112 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1113 | psf->sf_crcount = pmc->crcount; |
1114 | } | |
1115 | spin_unlock_bh(&im->lock); | |
1116 | ||
1117 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1118 | pmc->next = in_dev->mc_tomb; | |
1119 | in_dev->mc_tomb = pmc; | |
1120 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1121 | } | |
1122 | ||
63007727 | 1123 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1124 | { |
1125 | struct ip_mc_list *pmc, *pmc_prev; | |
1126 | struct ip_sf_list *psf, *psf_next; | |
1127 | ||
1128 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1129 | pmc_prev = NULL; | |
c71151f0 | 1130 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1131 | if (pmc->multiaddr == multiaddr) |
1132 | break; | |
1133 | pmc_prev = pmc; | |
1134 | } | |
1135 | if (pmc) { | |
1136 | if (pmc_prev) | |
1137 | pmc_prev->next = pmc->next; | |
1138 | else | |
1139 | in_dev->mc_tomb = pmc->next; | |
1140 | } | |
1141 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1142 | if (pmc) { | |
c71151f0 | 1143 | for (psf = pmc->tomb; psf; psf = psf_next) { |
1da177e4 LT |
1144 | psf_next = psf->sf_next; |
1145 | kfree(psf); | |
1146 | } | |
1147 | in_dev_put(pmc->interface); | |
1148 | kfree(pmc); | |
1149 | } | |
1150 | } | |
1151 | ||
1152 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1153 | { | |
1154 | struct ip_mc_list *pmc, *nextpmc; | |
1155 | ||
1156 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1157 | pmc = in_dev->mc_tomb; | |
1158 | in_dev->mc_tomb = NULL; | |
1159 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1160 | ||
1161 | for (; pmc; pmc = nextpmc) { | |
1162 | nextpmc = pmc->next; | |
1163 | ip_mc_clear_src(pmc); | |
1164 | in_dev_put(pmc->interface); | |
1165 | kfree(pmc); | |
1166 | } | |
1167 | /* clear dead sources, too */ | |
1d7138de ED |
1168 | rcu_read_lock(); |
1169 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1170 | struct ip_sf_list *psf, *psf_next; |
1171 | ||
1172 | spin_lock_bh(&pmc->lock); | |
1173 | psf = pmc->tomb; | |
1174 | pmc->tomb = NULL; | |
1175 | spin_unlock_bh(&pmc->lock); | |
c71151f0 | 1176 | for (; psf; psf = psf_next) { |
1da177e4 LT |
1177 | psf_next = psf->sf_next; |
1178 | kfree(psf); | |
1179 | } | |
1180 | } | |
1d7138de | 1181 | rcu_read_unlock(); |
1da177e4 LT |
1182 | } |
1183 | #endif | |
1184 | ||
1185 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1186 | { | |
1187 | struct in_device *in_dev = im->interface; | |
1188 | #ifdef CONFIG_IP_MULTICAST | |
1189 | int reporter; | |
1190 | #endif | |
1191 | ||
1192 | if (im->loaded) { | |
1193 | im->loaded = 0; | |
1194 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1195 | } | |
1196 | ||
1197 | #ifdef CONFIG_IP_MULTICAST | |
1198 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1199 | return; | |
df2cf4a7 PD |
1200 | if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports) |
1201 | return; | |
1da177e4 LT |
1202 | |
1203 | reporter = im->reporter; | |
1204 | igmp_stop_timer(im); | |
1205 | ||
1206 | if (!in_dev->dead) { | |
1207 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1208 | return; |
1da177e4 LT |
1209 | if (IGMP_V2_SEEN(in_dev)) { |
1210 | if (reporter) | |
1211 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1212 | return; |
1da177e4 LT |
1213 | } |
1214 | /* IGMPv3 */ | |
1215 | igmpv3_add_delrec(in_dev, im); | |
1216 | ||
1217 | igmp_ifc_event(in_dev); | |
1218 | } | |
1da177e4 | 1219 | #endif |
1da177e4 LT |
1220 | } |
1221 | ||
1222 | static void igmp_group_added(struct ip_mc_list *im) | |
1223 | { | |
1224 | struct in_device *in_dev = im->interface; | |
1225 | ||
1226 | if (im->loaded == 0) { | |
1227 | im->loaded = 1; | |
1228 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1229 | } | |
1230 | ||
1231 | #ifdef CONFIG_IP_MULTICAST | |
1232 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1233 | return; | |
df2cf4a7 PD |
1234 | if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports) |
1235 | return; | |
1da177e4 LT |
1236 | |
1237 | if (in_dev->dead) | |
1238 | return; | |
1239 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1240 | spin_lock_bh(&im->lock); | |
436f7c20 | 1241 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); |
1da177e4 LT |
1242 | spin_unlock_bh(&im->lock); |
1243 | return; | |
1244 | } | |
1245 | /* else, v3 */ | |
1246 | ||
a9fe8e29 | 1247 | im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
1248 | igmp_ifc_event(in_dev); |
1249 | #endif | |
1250 | } | |
1251 | ||
1252 | ||
1253 | /* | |
1254 | * Multicast list managers | |
1255 | */ | |
1256 | ||
e9897071 ED |
1257 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1258 | { | |
c70eba74 | 1259 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1260 | } |
1261 | ||
1262 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1263 | struct ip_mc_list *im) | |
1264 | { | |
1265 | struct ip_mc_list __rcu **mc_hash; | |
1266 | u32 hash; | |
1267 | ||
1268 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1269 | if (mc_hash) { | |
1270 | hash = ip_mc_hash(im); | |
c70eba74 | 1271 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1272 | rcu_assign_pointer(mc_hash[hash], im); |
1273 | return; | |
1274 | } | |
1275 | ||
1276 | /* do not use a hash table for small number of items */ | |
1277 | if (in_dev->mc_count < 4) | |
1278 | return; | |
1279 | ||
1280 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1281 | GFP_KERNEL); | |
1282 | if (!mc_hash) | |
1283 | return; | |
1284 | ||
1285 | for_each_pmc_rtnl(in_dev, im) { | |
1286 | hash = ip_mc_hash(im); | |
c70eba74 | 1287 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1288 | RCU_INIT_POINTER(mc_hash[hash], im); |
1289 | } | |
1290 | ||
1291 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1292 | } | |
1293 | ||
1294 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1295 | struct ip_mc_list *im) | |
1296 | { | |
1297 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1298 | struct ip_mc_list *aux; | |
1299 | ||
1300 | if (!mc_hash) | |
1301 | return; | |
1302 | mc_hash += ip_mc_hash(im); | |
1303 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1304 | mc_hash = &aux->next_hash; | |
1305 | *mc_hash = im->next_hash; | |
1306 | } | |
1307 | ||
1da177e4 LT |
1308 | |
1309 | /* | |
1310 | * A socket has joined a multicast group on device dev. | |
1311 | */ | |
1312 | ||
8f935bbd | 1313 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1314 | { |
1315 | struct ip_mc_list *im; | |
1316 | ||
1317 | ASSERT_RTNL(); | |
1318 | ||
1d7138de | 1319 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1320 | if (im->multiaddr == addr) { |
1321 | im->users++; | |
1322 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1323 | goto out; | |
1324 | } | |
1325 | } | |
1326 | ||
1d7138de | 1327 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1328 | if (!im) |
1329 | goto out; | |
1330 | ||
a7e9ff73 JK |
1331 | im->users = 1; |
1332 | im->interface = in_dev; | |
1da177e4 | 1333 | in_dev_hold(in_dev); |
a7e9ff73 | 1334 | im->multiaddr = addr; |
1da177e4 LT |
1335 | /* initial mode is (EX, empty) */ |
1336 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1337 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1338 | atomic_set(&im->refcnt, 1); |
1339 | spin_lock_init(&im->lock); | |
1340 | #ifdef CONFIG_IP_MULTICAST | |
179542a5 | 1341 | setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im); |
a9fe8e29 | 1342 | im->unsolicit_count = sysctl_igmp_qrv; |
1da177e4 | 1343 | #endif |
1d7138de ED |
1344 | |
1345 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1346 | in_dev->mc_count++; |
cf778b00 | 1347 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1348 | |
e9897071 ED |
1349 | ip_mc_hash_add(in_dev, im); |
1350 | ||
1da177e4 LT |
1351 | #ifdef CONFIG_IP_MULTICAST |
1352 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1353 | #endif | |
1354 | igmp_group_added(im); | |
1355 | if (!in_dev->dead) | |
1356 | ip_rt_multicast_event(in_dev); | |
1357 | out: | |
1358 | return; | |
1359 | } | |
4bc2f18b | 1360 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1361 | |
9afd85c9 LL |
1362 | static int ip_mc_check_iphdr(struct sk_buff *skb) |
1363 | { | |
1364 | const struct iphdr *iph; | |
1365 | unsigned int len; | |
1366 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1367 | ||
1368 | if (!pskb_may_pull(skb, offset)) | |
1369 | return -EINVAL; | |
1370 | ||
1371 | iph = ip_hdr(skb); | |
1372 | ||
1373 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1374 | return -EINVAL; | |
1375 | ||
1376 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1377 | ||
1378 | if (!pskb_may_pull(skb, offset)) | |
1379 | return -EINVAL; | |
1380 | ||
1381 | iph = ip_hdr(skb); | |
1382 | ||
1383 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1384 | return -EINVAL; | |
1385 | ||
1386 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1387 | if (skb->len < len || len < offset) | |
1388 | return -EINVAL; | |
1389 | ||
1390 | skb_set_transport_header(skb, offset); | |
1391 | ||
1392 | return 0; | |
1393 | } | |
1394 | ||
1395 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1396 | { | |
1397 | unsigned int len = skb_transport_offset(skb); | |
1398 | ||
1399 | len += sizeof(struct igmpv3_report); | |
1400 | ||
1401 | return pskb_may_pull(skb, len) ? 0 : -EINVAL; | |
1402 | } | |
1403 | ||
1404 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1405 | { | |
1406 | unsigned int len = skb_transport_offset(skb); | |
1407 | ||
1408 | len += sizeof(struct igmphdr); | |
1409 | if (skb->len < len) | |
1410 | return -EINVAL; | |
1411 | ||
1412 | /* IGMPv{1,2}? */ | |
1413 | if (skb->len != len) { | |
1414 | /* or IGMPv3? */ | |
1415 | len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); | |
1416 | if (skb->len < len || !pskb_may_pull(skb, len)) | |
1417 | return -EINVAL; | |
1418 | } | |
1419 | ||
1420 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1421 | * all-systems destination addresses (224.0.0.1) for general queries | |
1422 | */ | |
1423 | if (!igmp_hdr(skb)->group && | |
1424 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1425 | return -EINVAL; | |
1426 | ||
1427 | return 0; | |
1428 | } | |
1429 | ||
1430 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1431 | { | |
1432 | switch (igmp_hdr(skb)->type) { | |
1433 | case IGMP_HOST_LEAVE_MESSAGE: | |
1434 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1435 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1436 | /* fall through */ | |
1437 | return 0; | |
1438 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1439 | return ip_mc_check_igmp_reportv3(skb); | |
1440 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1441 | return ip_mc_check_igmp_query(skb); | |
1442 | default: | |
1443 | return -ENOMSG; | |
1444 | } | |
1445 | } | |
1446 | ||
1447 | static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) | |
1448 | { | |
1449 | return skb_checksum_simple_validate(skb); | |
1450 | } | |
1451 | ||
1452 | static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1453 | ||
1454 | { | |
1455 | struct sk_buff *skb_chk; | |
1456 | unsigned int transport_len; | |
1457 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); | |
a516993f | 1458 | int ret = -EINVAL; |
9afd85c9 LL |
1459 | |
1460 | transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); | |
1461 | ||
9afd85c9 LL |
1462 | skb_chk = skb_checksum_trimmed(skb, transport_len, |
1463 | ip_mc_validate_checksum); | |
1464 | if (!skb_chk) | |
a516993f | 1465 | goto err; |
9afd85c9 | 1466 | |
a516993f LL |
1467 | if (!pskb_may_pull(skb_chk, len)) |
1468 | goto err; | |
9afd85c9 LL |
1469 | |
1470 | ret = ip_mc_check_igmp_msg(skb_chk); | |
a516993f LL |
1471 | if (ret) |
1472 | goto err; | |
9afd85c9 LL |
1473 | |
1474 | if (skb_trimmed) | |
1475 | *skb_trimmed = skb_chk; | |
a516993f LL |
1476 | /* free now unneeded clone */ |
1477 | else if (skb_chk != skb) | |
9afd85c9 LL |
1478 | kfree_skb(skb_chk); |
1479 | ||
a516993f LL |
1480 | ret = 0; |
1481 | ||
1482 | err: | |
1483 | if (ret && skb_chk && skb_chk != skb) | |
1484 | kfree_skb(skb_chk); | |
1485 | ||
1486 | return ret; | |
9afd85c9 LL |
1487 | } |
1488 | ||
1489 | /** | |
1490 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1491 | * @skb: the skb to validate | |
1492 | * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) | |
1493 | * | |
1494 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
a516993f | 1495 | * skb transport header accordingly and returns zero. |
9afd85c9 LL |
1496 | * |
1497 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1498 | * standard | |
1499 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1500 | * -ENOMEM: A memory allocation failure happened. | |
1501 | * | |
1502 | * Optionally, an skb pointer might be provided via skb_trimmed (or set it | |
1503 | * to NULL): After parsing an IGMP packet successfully it will point to | |
1504 | * an skb which has its tail aligned to the IP packet end. This might | |
1505 | * either be the originally provided skb or a trimmed, cloned version if | |
1506 | * the skb frame had data beyond the IP packet. A cloned skb allows us | |
1507 | * to leave the original skb and its full frame unchanged (which might be | |
1508 | * desirable for layer 2 frame jugglers). | |
1509 | * | |
a516993f LL |
1510 | * Caller needs to set the skb network header and free any returned skb if it |
1511 | * differs from the provided skb. | |
9afd85c9 LL |
1512 | */ |
1513 | int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1514 | { | |
1515 | int ret = ip_mc_check_iphdr(skb); | |
1516 | ||
1517 | if (ret < 0) | |
1518 | return ret; | |
1519 | ||
1520 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1521 | return -ENOMSG; | |
1522 | ||
1523 | return __ip_mc_check_igmp(skb, skb_trimmed); | |
1524 | } | |
1525 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1526 | ||
a816c7c7 | 1527 | /* |
4aa5dee4 | 1528 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1529 | */ |
4aa5dee4 | 1530 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1531 | { |
08882669 | 1532 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1533 | struct ip_mc_list *im; |
1534 | int type; | |
a816c7c7 | 1535 | |
4aa5dee4 JP |
1536 | ASSERT_RTNL(); |
1537 | ||
1538 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1539 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1540 | continue; | |
df2cf4a7 PD |
1541 | if (ipv4_is_local_multicast(im->multiaddr) && |
1542 | !sysctl_igmp_llm_reports) | |
1543 | continue; | |
a816c7c7 | 1544 | |
866f3b25 ED |
1545 | /* a failover is happening and switches |
1546 | * must be notified immediately | |
1547 | */ | |
1548 | if (IGMP_V1_SEEN(in_dev)) | |
1549 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1550 | else if (IGMP_V2_SEEN(in_dev)) | |
1551 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1552 | else | |
1553 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1554 | igmp_send_report(in_dev, im, type); | |
1555 | } | |
a816c7c7 JV |
1556 | #endif |
1557 | } | |
1558 | ||
1da177e4 LT |
1559 | /* |
1560 | * A socket has left a multicast group on device dev | |
1561 | */ | |
1562 | ||
8f935bbd | 1563 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1564 | { |
1d7138de ED |
1565 | struct ip_mc_list *i; |
1566 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1567 | |
1da177e4 | 1568 | ASSERT_RTNL(); |
e905a9ed | 1569 | |
1d7138de ED |
1570 | for (ip = &in_dev->mc_list; |
1571 | (i = rtnl_dereference(*ip)) != NULL; | |
1572 | ip = &i->next_rcu) { | |
a7e9ff73 | 1573 | if (i->multiaddr == addr) { |
1da177e4 | 1574 | if (--i->users == 0) { |
e9897071 | 1575 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1576 | *ip = i->next_rcu; |
b8bae41e | 1577 | in_dev->mc_count--; |
1da177e4 | 1578 | igmp_group_dropped(i); |
24cf3af3 | 1579 | ip_mc_clear_src(i); |
1da177e4 LT |
1580 | |
1581 | if (!in_dev->dead) | |
1582 | ip_rt_multicast_event(in_dev); | |
1583 | ||
1584 | ip_ma_put(i); | |
1585 | return; | |
1586 | } | |
1587 | break; | |
1588 | } | |
1589 | } | |
1590 | } | |
4bc2f18b | 1591 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1592 | |
75c78500 MS |
1593 | /* Device changing type */ |
1594 | ||
1595 | void ip_mc_unmap(struct in_device *in_dev) | |
1596 | { | |
1d7138de | 1597 | struct ip_mc_list *pmc; |
75c78500 MS |
1598 | |
1599 | ASSERT_RTNL(); | |
1600 | ||
1d7138de ED |
1601 | for_each_pmc_rtnl(in_dev, pmc) |
1602 | igmp_group_dropped(pmc); | |
75c78500 MS |
1603 | } |
1604 | ||
1605 | void ip_mc_remap(struct in_device *in_dev) | |
1606 | { | |
1d7138de | 1607 | struct ip_mc_list *pmc; |
75c78500 MS |
1608 | |
1609 | ASSERT_RTNL(); | |
1610 | ||
1d7138de ED |
1611 | for_each_pmc_rtnl(in_dev, pmc) |
1612 | igmp_group_added(pmc); | |
75c78500 MS |
1613 | } |
1614 | ||
1da177e4 LT |
1615 | /* Device going down */ |
1616 | ||
1617 | void ip_mc_down(struct in_device *in_dev) | |
1618 | { | |
1d7138de | 1619 | struct ip_mc_list *pmc; |
1da177e4 LT |
1620 | |
1621 | ASSERT_RTNL(); | |
1622 | ||
1d7138de ED |
1623 | for_each_pmc_rtnl(in_dev, pmc) |
1624 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1625 | |
1626 | #ifdef CONFIG_IP_MULTICAST | |
1627 | in_dev->mr_ifc_count = 0; | |
1628 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1629 | __in_dev_put(in_dev); | |
1630 | in_dev->mr_gq_running = 0; | |
1631 | if (del_timer(&in_dev->mr_gq_timer)) | |
1632 | __in_dev_put(in_dev); | |
1633 | igmpv3_clear_delrec(in_dev); | |
1634 | #endif | |
1635 | ||
1636 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1637 | } | |
1638 | ||
1639 | void ip_mc_init_dev(struct in_device *in_dev) | |
1640 | { | |
1641 | ASSERT_RTNL(); | |
1642 | ||
1da177e4 | 1643 | #ifdef CONFIG_IP_MULTICAST |
b24b8a24 PE |
1644 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1645 | (unsigned long)in_dev); | |
b24b8a24 PE |
1646 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1647 | (unsigned long)in_dev); | |
a9fe8e29 | 1648 | in_dev->mr_qrv = sysctl_igmp_qrv; |
1da177e4 LT |
1649 | #endif |
1650 | ||
1da177e4 LT |
1651 | spin_lock_init(&in_dev->mc_tomb_lock); |
1652 | } | |
1653 | ||
1654 | /* Device going up */ | |
1655 | ||
1656 | void ip_mc_up(struct in_device *in_dev) | |
1657 | { | |
1d7138de | 1658 | struct ip_mc_list *pmc; |
1da177e4 LT |
1659 | |
1660 | ASSERT_RTNL(); | |
1661 | ||
a9fe8e29 HFS |
1662 | #ifdef CONFIG_IP_MULTICAST |
1663 | in_dev->mr_qrv = sysctl_igmp_qrv; | |
1664 | #endif | |
1da177e4 LT |
1665 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1666 | ||
1d7138de ED |
1667 | for_each_pmc_rtnl(in_dev, pmc) |
1668 | igmp_group_added(pmc); | |
1da177e4 LT |
1669 | } |
1670 | ||
1671 | /* | |
1672 | * Device is about to be destroyed: clean up. | |
1673 | */ | |
1674 | ||
1675 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1676 | { | |
1677 | struct ip_mc_list *i; | |
1678 | ||
1679 | ASSERT_RTNL(); | |
1680 | ||
1681 | /* Deactivate timers */ | |
1682 | ip_mc_down(in_dev); | |
1683 | ||
1d7138de ED |
1684 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1685 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1686 | in_dev->mc_count--; |
1d7138de | 1687 | |
24cf3af3 VF |
1688 | /* We've dropped the groups in ip_mc_down already */ |
1689 | ip_mc_clear_src(i); | |
1da177e4 | 1690 | ip_ma_put(i); |
1da177e4 | 1691 | } |
1da177e4 LT |
1692 | } |
1693 | ||
9e917dca | 1694 | /* RTNL is locked */ |
877acedc | 1695 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1696 | { |
1da177e4 LT |
1697 | struct net_device *dev = NULL; |
1698 | struct in_device *idev = NULL; | |
1699 | ||
1700 | if (imr->imr_ifindex) { | |
877acedc | 1701 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1702 | return idev; |
1703 | } | |
1704 | if (imr->imr_address.s_addr) { | |
9e917dca | 1705 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1706 | if (!dev) |
1707 | return NULL; | |
1da177e4 LT |
1708 | } |
1709 | ||
b23dd4fe | 1710 | if (!dev) { |
78fbfd8a DM |
1711 | struct rtable *rt = ip_route_output(net, |
1712 | imr->imr_multiaddr.s_addr, | |
1713 | 0, 0, 0); | |
b23dd4fe DM |
1714 | if (!IS_ERR(rt)) { |
1715 | dev = rt->dst.dev; | |
1716 | ip_rt_put(rt); | |
1717 | } | |
1da177e4 LT |
1718 | } |
1719 | if (dev) { | |
1720 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1721 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1722 | } |
1723 | return idev; | |
1724 | } | |
1725 | ||
1726 | /* | |
1727 | * Join a socket to a group | |
1728 | */ | |
ab32ea5d | 1729 | int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; |
a9fe8e29 | 1730 | #ifdef CONFIG_IP_MULTICAST |
436f7c20 | 1731 | int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE; |
a9fe8e29 | 1732 | #endif |
1da177e4 LT |
1733 | |
1734 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1735 | __be32 *psfsrc) |
1da177e4 LT |
1736 | { |
1737 | struct ip_sf_list *psf, *psf_prev; | |
1738 | int rv = 0; | |
1739 | ||
1740 | psf_prev = NULL; | |
c71151f0 | 1741 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1742 | if (psf->sf_inaddr == *psfsrc) |
1743 | break; | |
1744 | psf_prev = psf; | |
1745 | } | |
1746 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1747 | /* source filter not found, or count wrong => bug */ | |
1748 | return -ESRCH; | |
1749 | } | |
1750 | psf->sf_count[sfmode]--; | |
1751 | if (psf->sf_count[sfmode] == 0) { | |
1752 | ip_rt_multicast_event(pmc->interface); | |
1753 | } | |
1754 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1755 | #ifdef CONFIG_IP_MULTICAST | |
1756 | struct in_device *in_dev = pmc->interface; | |
1757 | #endif | |
1758 | ||
1759 | /* no more filters for this source */ | |
1760 | if (psf_prev) | |
1761 | psf_prev->sf_next = psf->sf_next; | |
1762 | else | |
1763 | pmc->sources = psf->sf_next; | |
1764 | #ifdef CONFIG_IP_MULTICAST | |
1765 | if (psf->sf_oldin && | |
1766 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
a9fe8e29 | 1767 | psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
1768 | psf->sf_next = pmc->tomb; |
1769 | pmc->tomb = psf; | |
1770 | rv = 1; | |
1771 | } else | |
1772 | #endif | |
1773 | kfree(psf); | |
1774 | } | |
1775 | return rv; | |
1776 | } | |
1777 | ||
1778 | #ifndef CONFIG_IP_MULTICAST | |
1779 | #define igmp_ifc_event(x) do { } while (0) | |
1780 | #endif | |
1781 | ||
8f935bbd AV |
1782 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1783 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1784 | { |
1785 | struct ip_mc_list *pmc; | |
1786 | int changerec = 0; | |
1787 | int i, err; | |
1788 | ||
1789 | if (!in_dev) | |
1790 | return -ENODEV; | |
1d7138de ED |
1791 | rcu_read_lock(); |
1792 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1793 | if (*pmca == pmc->multiaddr) |
1794 | break; | |
1795 | } | |
1796 | if (!pmc) { | |
1797 | /* MCA not found?? bug */ | |
1d7138de | 1798 | rcu_read_unlock(); |
1da177e4 LT |
1799 | return -ESRCH; |
1800 | } | |
1801 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1802 | rcu_read_unlock(); |
1da177e4 LT |
1803 | #ifdef CONFIG_IP_MULTICAST |
1804 | sf_markstate(pmc); | |
1805 | #endif | |
1806 | if (!delta) { | |
1807 | err = -EINVAL; | |
1808 | if (!pmc->sfcount[sfmode]) | |
1809 | goto out_unlock; | |
1810 | pmc->sfcount[sfmode]--; | |
1811 | } | |
1812 | err = 0; | |
c71151f0 | 1813 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
1814 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
1815 | ||
1816 | changerec |= rv > 0; | |
1817 | if (!err && rv < 0) | |
1818 | err = rv; | |
1819 | } | |
1820 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1821 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1822 | pmc->sfcount[MCAST_INCLUDE]) { | |
1823 | #ifdef CONFIG_IP_MULTICAST | |
1824 | struct ip_sf_list *psf; | |
1825 | #endif | |
1826 | ||
1827 | /* filter mode change */ | |
1828 | pmc->sfmode = MCAST_INCLUDE; | |
1829 | #ifdef CONFIG_IP_MULTICAST | |
a9fe8e29 | 1830 | pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 | 1831 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 1832 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1833 | psf->sf_crcount = 0; |
1834 | igmp_ifc_event(pmc->interface); | |
1835 | } else if (sf_setstate(pmc) || changerec) { | |
1836 | igmp_ifc_event(pmc->interface); | |
1837 | #endif | |
1838 | } | |
1839 | out_unlock: | |
1840 | spin_unlock_bh(&pmc->lock); | |
1841 | return err; | |
1842 | } | |
1843 | ||
1844 | /* | |
1845 | * Add multicast single-source filter to the interface list | |
1846 | */ | |
1847 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1848 | __be32 *psfsrc) |
1da177e4 LT |
1849 | { |
1850 | struct ip_sf_list *psf, *psf_prev; | |
1851 | ||
1852 | psf_prev = NULL; | |
c71151f0 | 1853 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1854 | if (psf->sf_inaddr == *psfsrc) |
1855 | break; | |
1856 | psf_prev = psf; | |
1857 | } | |
1858 | if (!psf) { | |
0da974f4 | 1859 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1860 | if (!psf) |
1861 | return -ENOBUFS; | |
1da177e4 LT |
1862 | psf->sf_inaddr = *psfsrc; |
1863 | if (psf_prev) { | |
1864 | psf_prev->sf_next = psf; | |
1865 | } else | |
1866 | pmc->sources = psf; | |
1867 | } | |
1868 | psf->sf_count[sfmode]++; | |
1869 | if (psf->sf_count[sfmode] == 1) { | |
1870 | ip_rt_multicast_event(pmc->interface); | |
1871 | } | |
1872 | return 0; | |
1873 | } | |
1874 | ||
1875 | #ifdef CONFIG_IP_MULTICAST | |
1876 | static void sf_markstate(struct ip_mc_list *pmc) | |
1877 | { | |
1878 | struct ip_sf_list *psf; | |
1879 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1880 | ||
c71151f0 | 1881 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1882 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1883 | psf->sf_oldin = mca_xcount == | |
1884 | psf->sf_count[MCAST_EXCLUDE] && | |
1885 | !psf->sf_count[MCAST_INCLUDE]; | |
1886 | } else | |
1887 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1888 | } | |
1889 | ||
1890 | static int sf_setstate(struct ip_mc_list *pmc) | |
1891 | { | |
ad12583f | 1892 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1893 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1894 | int qrv = pmc->interface->mr_qrv; | |
1895 | int new_in, rv; | |
1896 | ||
1897 | rv = 0; | |
c71151f0 | 1898 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1899 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1900 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1901 | !psf->sf_count[MCAST_INCLUDE]; | |
1902 | } else | |
1903 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1904 | if (new_in) { |
1905 | if (!psf->sf_oldin) { | |
76edc605 | 1906 | struct ip_sf_list *prev = NULL; |
ad12583f | 1907 | |
c71151f0 | 1908 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
1909 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1910 | break; | |
1911 | prev = dpsf; | |
1912 | } | |
1913 | if (dpsf) { | |
1914 | if (prev) | |
1915 | prev->sf_next = dpsf->sf_next; | |
1916 | else | |
1917 | pmc->tomb = dpsf->sf_next; | |
1918 | kfree(dpsf); | |
1919 | } | |
1920 | psf->sf_crcount = qrv; | |
1921 | rv++; | |
1922 | } | |
1923 | } else if (psf->sf_oldin) { | |
1924 | ||
1925 | psf->sf_crcount = 0; | |
1926 | /* | |
1927 | * add or update "delete" records if an active filter | |
1928 | * is now inactive | |
1929 | */ | |
c71151f0 | 1930 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
1931 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1932 | break; | |
1933 | if (!dpsf) { | |
3ed37a6f | 1934 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1935 | if (!dpsf) |
1936 | continue; | |
1937 | *dpsf = *psf; | |
1938 | /* pmc->lock held by callers */ | |
1939 | dpsf->sf_next = pmc->tomb; | |
1940 | pmc->tomb = dpsf; | |
1941 | } | |
1942 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1943 | rv++; |
1944 | } | |
1945 | } | |
1946 | return rv; | |
1947 | } | |
1948 | #endif | |
1949 | ||
1950 | /* | |
1951 | * Add multicast source filter list to the interface list | |
1952 | */ | |
8f935bbd AV |
1953 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1954 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1955 | { |
1956 | struct ip_mc_list *pmc; | |
1957 | int isexclude; | |
1958 | int i, err; | |
1959 | ||
1960 | if (!in_dev) | |
1961 | return -ENODEV; | |
1d7138de ED |
1962 | rcu_read_lock(); |
1963 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1964 | if (*pmca == pmc->multiaddr) |
1965 | break; | |
1966 | } | |
1967 | if (!pmc) { | |
1968 | /* MCA not found?? bug */ | |
1d7138de | 1969 | rcu_read_unlock(); |
1da177e4 LT |
1970 | return -ESRCH; |
1971 | } | |
1972 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1973 | rcu_read_unlock(); |
1da177e4 LT |
1974 | |
1975 | #ifdef CONFIG_IP_MULTICAST | |
1976 | sf_markstate(pmc); | |
1977 | #endif | |
1978 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1979 | if (!delta) | |
1980 | pmc->sfcount[sfmode]++; | |
1981 | err = 0; | |
c71151f0 | 1982 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 1983 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
1984 | if (err) |
1985 | break; | |
1986 | } | |
1987 | if (err) { | |
1988 | int j; | |
1989 | ||
685f94e6 JZ |
1990 | if (!delta) |
1991 | pmc->sfcount[sfmode]--; | |
c71151f0 | 1992 | for (j = 0; j < i; j++) |
a1889c0d | 1993 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
1994 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
1995 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 1996 | struct ip_sf_list *psf; |
cfcabdcc | 1997 | in_dev = pmc->interface; |
1da177e4 LT |
1998 | #endif |
1999 | ||
2000 | /* filter mode change */ | |
2001 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
2002 | pmc->sfmode = MCAST_EXCLUDE; | |
2003 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
2004 | pmc->sfmode = MCAST_INCLUDE; | |
2005 | #ifdef CONFIG_IP_MULTICAST | |
2006 | /* else no filters; keep old mode for reports */ | |
2007 | ||
a9fe8e29 | 2008 | pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 | 2009 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 2010 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2011 | psf->sf_crcount = 0; |
2012 | igmp_ifc_event(in_dev); | |
2013 | } else if (sf_setstate(pmc)) { | |
2014 | igmp_ifc_event(in_dev); | |
2015 | #endif | |
2016 | } | |
2017 | spin_unlock_bh(&pmc->lock); | |
2018 | return err; | |
2019 | } | |
2020 | ||
2021 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
2022 | { | |
2023 | struct ip_sf_list *psf, *nextpsf; | |
2024 | ||
c71151f0 | 2025 | for (psf = pmc->tomb; psf; psf = nextpsf) { |
1da177e4 LT |
2026 | nextpsf = psf->sf_next; |
2027 | kfree(psf); | |
2028 | } | |
2029 | pmc->tomb = NULL; | |
c71151f0 | 2030 | for (psf = pmc->sources; psf; psf = nextpsf) { |
1da177e4 LT |
2031 | nextpsf = psf->sf_next; |
2032 | kfree(psf); | |
2033 | } | |
2034 | pmc->sources = NULL; | |
2035 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 2036 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
2037 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
2038 | } | |
2039 | ||
54ff9ef3 MRL |
2040 | /* Join a multicast group |
2041 | */ | |
2042 | ||
2043 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
1da177e4 | 2044 | { |
8f935bbd | 2045 | __be32 addr = imr->imr_multiaddr.s_addr; |
959d10f6 | 2046 | struct ip_mc_socklist *iml, *i; |
1da177e4 LT |
2047 | struct in_device *in_dev; |
2048 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 2049 | struct net *net = sock_net(sk); |
ca9b907d | 2050 | int ifindex; |
1da177e4 | 2051 | int count = 0; |
959d10f6 ED |
2052 | int err; |
2053 | ||
2054 | ASSERT_RTNL(); | |
1da177e4 | 2055 | |
f97c1e0c | 2056 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2057 | return -EINVAL; |
2058 | ||
877acedc | 2059 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
2060 | |
2061 | if (!in_dev) { | |
1da177e4 LT |
2062 | err = -ENODEV; |
2063 | goto done; | |
2064 | } | |
2065 | ||
1da177e4 | 2066 | err = -EADDRINUSE; |
ca9b907d | 2067 | ifindex = imr->imr_ifindex; |
1d7138de | 2068 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
2069 | if (i->multi.imr_multiaddr.s_addr == addr && |
2070 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 2071 | goto done; |
1da177e4 LT |
2072 | count++; |
2073 | } | |
2074 | err = -ENOBUFS; | |
815c5270 | 2075 | if (count >= net->ipv4.sysctl_igmp_max_memberships) |
ca9b907d | 2076 | goto done; |
a7e9ff73 | 2077 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
51456b29 | 2078 | if (!iml) |
1da177e4 | 2079 | goto done; |
ca9b907d | 2080 | |
1da177e4 | 2081 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 2082 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
2083 | iml->sflist = NULL; |
2084 | iml->sfmode = MCAST_EXCLUDE; | |
cf778b00 | 2085 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 2086 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 2087 | err = 0; |
1da177e4 | 2088 | done: |
1da177e4 LT |
2089 | return err; |
2090 | } | |
4bc2f18b | 2091 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
2092 | |
2093 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
2094 | struct in_device *in_dev) | |
2095 | { | |
1d7138de | 2096 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
2097 | int err; |
2098 | ||
51456b29 | 2099 | if (!psf) { |
1da177e4 LT |
2100 | /* any-source empty exclude case */ |
2101 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2102 | iml->sfmode, 0, NULL, 0); | |
2103 | } | |
2104 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 2105 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 2106 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
2107 | /* decrease mem now to avoid the memleak warning */ |
2108 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2109 | kfree_rcu(psf, rcu); |
1da177e4 LT |
2110 | return err; |
2111 | } | |
2112 | ||
54ff9ef3 | 2113 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
1da177e4 LT |
2114 | { |
2115 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
2116 | struct ip_mc_socklist *iml; |
2117 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 2118 | struct in_device *in_dev; |
877acedc | 2119 | struct net *net = sock_net(sk); |
8f935bbd | 2120 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 2121 | u32 ifindex; |
acd6e00b | 2122 | int ret = -EADDRNOTAVAIL; |
1da177e4 | 2123 | |
959d10f6 ED |
2124 | ASSERT_RTNL(); |
2125 | ||
877acedc | 2126 | in_dev = ip_mc_find_dev(net, imr); |
4eba7bb1 | 2127 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
52ad353a | 2128 | ret = -ENODEV; |
2129 | goto out; | |
2130 | } | |
84b42bae | 2131 | ifindex = imr->imr_ifindex; |
1d7138de ED |
2132 | for (imlp = &inet->mc_list; |
2133 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2134 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
2135 | if (iml->multi.imr_multiaddr.s_addr != group) |
2136 | continue; | |
2137 | if (ifindex) { | |
2138 | if (iml->multi.imr_ifindex != ifindex) | |
2139 | continue; | |
2140 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2141 | iml->multi.imr_address.s_addr) | |
2142 | continue; | |
1da177e4 | 2143 | |
acd6e00b | 2144 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 2145 | |
1d7138de | 2146 | *imlp = iml->next_rcu; |
acd6e00b | 2147 | |
4eba7bb1 AL |
2148 | if (in_dev) |
2149 | ip_mc_dec_group(in_dev, group); | |
959d10f6 | 2150 | |
c85bb41e FL |
2151 | /* decrease mem now to avoid the memleak warning */ |
2152 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2153 | kfree_rcu(iml, rcu); |
acd6e00b | 2154 | return 0; |
1da177e4 | 2155 | } |
52ad353a | 2156 | out: |
959d10f6 ED |
2157 | return ret; |
2158 | } | |
193ba924 | 2159 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
2160 | |
2161 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2162 | ip_mreq_source *mreqs, int ifindex) | |
2163 | { | |
2164 | int err; | |
2165 | struct ip_mreqn imr; | |
63007727 | 2166 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
2167 | struct ip_mc_socklist *pmc; |
2168 | struct in_device *in_dev = NULL; | |
2169 | struct inet_sock *inet = inet_sk(sk); | |
2170 | struct ip_sf_socklist *psl; | |
877acedc | 2171 | struct net *net = sock_net(sk); |
8cdaaa15 | 2172 | int leavegroup = 0; |
1da177e4 LT |
2173 | int i, j, rv; |
2174 | ||
f97c1e0c | 2175 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2176 | return -EINVAL; |
2177 | ||
54ff9ef3 | 2178 | ASSERT_RTNL(); |
1da177e4 LT |
2179 | |
2180 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2181 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2182 | imr.imr_ifindex = ifindex; | |
877acedc | 2183 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2184 | |
2185 | if (!in_dev) { | |
2186 | err = -ENODEV; | |
2187 | goto done; | |
2188 | } | |
2189 | err = -EADDRNOTAVAIL; | |
2190 | ||
1d7138de | 2191 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2192 | if ((pmc->multi.imr_multiaddr.s_addr == |
2193 | imr.imr_multiaddr.s_addr) && | |
2194 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2195 | break; |
2196 | } | |
917f2f10 DS |
2197 | if (!pmc) { /* must have a prior join */ |
2198 | err = -EINVAL; | |
1da177e4 | 2199 | goto done; |
917f2f10 | 2200 | } |
1da177e4 LT |
2201 | /* if a source filter was set, must be the same mode as before */ |
2202 | if (pmc->sflist) { | |
917f2f10 DS |
2203 | if (pmc->sfmode != omode) { |
2204 | err = -EINVAL; | |
1da177e4 | 2205 | goto done; |
917f2f10 | 2206 | } |
1da177e4 LT |
2207 | } else if (pmc->sfmode != omode) { |
2208 | /* allow mode switches for empty-set filters */ | |
2209 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2210 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2211 | NULL, 0); |
2212 | pmc->sfmode = omode; | |
2213 | } | |
2214 | ||
1d7138de | 2215 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2216 | if (!add) { |
2217 | if (!psl) | |
917f2f10 | 2218 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2219 | rv = !0; |
c71151f0 | 2220 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2221 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2222 | sizeof(__be32)); |
1da177e4 LT |
2223 | if (rv == 0) |
2224 | break; | |
2225 | } | |
2226 | if (rv) /* source not found */ | |
917f2f10 | 2227 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2228 | |
8cdaaa15 DS |
2229 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2230 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2231 | leavegroup = 1; | |
2232 | goto done; | |
2233 | } | |
2234 | ||
1da177e4 | 2235 | /* update the interface filter */ |
e905a9ed | 2236 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2237 | &mreqs->imr_sourceaddr, 1); |
2238 | ||
c71151f0 | 2239 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2240 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2241 | psl->sl_count--; | |
2242 | err = 0; | |
2243 | goto done; | |
2244 | } | |
2245 | /* else, add a new source to the filter */ | |
2246 | ||
2247 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
2248 | err = -ENOBUFS; | |
2249 | goto done; | |
2250 | } | |
2251 | if (!psl || psl->sl_count == psl->sl_max) { | |
2252 | struct ip_sf_socklist *newpsl; | |
2253 | int count = IP_SFBLOCK; | |
2254 | ||
2255 | if (psl) | |
2256 | count += psl->sl_max; | |
8b3a7005 | 2257 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2258 | if (!newpsl) { |
2259 | err = -ENOBUFS; | |
2260 | goto done; | |
2261 | } | |
2262 | newpsl->sl_max = count; | |
2263 | newpsl->sl_count = count - IP_SFBLOCK; | |
2264 | if (psl) { | |
c71151f0 | 2265 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2266 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e FL |
2267 | /* decrease mem now to avoid the memleak warning */ |
2268 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2269 | kfree_rcu(psl, rcu); |
1da177e4 | 2270 | } |
cf778b00 | 2271 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2272 | psl = newpsl; |
1da177e4 LT |
2273 | } |
2274 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2275 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2276 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2277 | sizeof(__be32)); |
1da177e4 LT |
2278 | if (rv == 0) |
2279 | break; | |
2280 | } | |
2281 | if (rv == 0) /* address already there is an error */ | |
2282 | goto done; | |
c71151f0 | 2283 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2284 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2285 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2286 | psl->sl_count++; | |
2287 | err = 0; | |
2288 | /* update the interface list */ | |
e905a9ed | 2289 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2290 | &mreqs->imr_sourceaddr, 1); |
2291 | done: | |
8cdaaa15 | 2292 | if (leavegroup) |
54ff9ef3 | 2293 | err = ip_mc_leave_group(sk, &imr); |
1da177e4 LT |
2294 | return err; |
2295 | } | |
2296 | ||
2297 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2298 | { | |
9951f036 | 2299 | int err = 0; |
1da177e4 | 2300 | struct ip_mreqn imr; |
63007727 | 2301 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2302 | struct ip_mc_socklist *pmc; |
2303 | struct in_device *in_dev; | |
2304 | struct inet_sock *inet = inet_sk(sk); | |
2305 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2306 | struct net *net = sock_net(sk); |
9951f036 | 2307 | int leavegroup = 0; |
1da177e4 | 2308 | |
f97c1e0c | 2309 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2310 | return -EINVAL; |
2311 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2312 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2313 | return -EINVAL; | |
2314 | ||
54ff9ef3 | 2315 | ASSERT_RTNL(); |
1da177e4 LT |
2316 | |
2317 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2318 | imr.imr_address.s_addr = msf->imsf_interface; | |
2319 | imr.imr_ifindex = ifindex; | |
877acedc | 2320 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2321 | |
2322 | if (!in_dev) { | |
2323 | err = -ENODEV; | |
2324 | goto done; | |
2325 | } | |
1da177e4 | 2326 | |
9951f036 DS |
2327 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2328 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2329 | leavegroup = 1; | |
2330 | goto done; | |
2331 | } | |
2332 | ||
1d7138de | 2333 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2334 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2335 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2336 | break; | |
2337 | } | |
917f2f10 DS |
2338 | if (!pmc) { /* must have a prior join */ |
2339 | err = -EINVAL; | |
1da177e4 | 2340 | goto done; |
917f2f10 | 2341 | } |
1da177e4 | 2342 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2343 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2344 | GFP_KERNEL); | |
1da177e4 LT |
2345 | if (!newpsl) { |
2346 | err = -ENOBUFS; | |
2347 | goto done; | |
2348 | } | |
2349 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2350 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2351 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2352 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2353 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2354 | if (err) { | |
2355 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2356 | goto done; | |
2357 | } | |
8713dbf0 | 2358 | } else { |
1da177e4 | 2359 | newpsl = NULL; |
8713dbf0 YZ |
2360 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2361 | msf->imsf_fmode, 0, NULL, 0); | |
2362 | } | |
1d7138de | 2363 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2364 | if (psl) { |
2365 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2366 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2367 | /* decrease mem now to avoid the memleak warning */ |
2368 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2369 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2370 | } else |
2371 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2372 | 0, NULL, 0); | |
cf778b00 | 2373 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2374 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2375 | err = 0; |
1da177e4 | 2376 | done: |
9951f036 DS |
2377 | if (leavegroup) |
2378 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2379 | return err; |
2380 | } | |
2381 | ||
2382 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2383 | struct ip_msfilter __user *optval, int __user *optlen) | |
2384 | { | |
2385 | int err, len, count, copycount; | |
2386 | struct ip_mreqn imr; | |
63007727 | 2387 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2388 | struct ip_mc_socklist *pmc; |
2389 | struct in_device *in_dev; | |
2390 | struct inet_sock *inet = inet_sk(sk); | |
2391 | struct ip_sf_socklist *psl; | |
877acedc | 2392 | struct net *net = sock_net(sk); |
1da177e4 | 2393 | |
87e9f031 WC |
2394 | ASSERT_RTNL(); |
2395 | ||
f97c1e0c | 2396 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2397 | return -EINVAL; |
2398 | ||
1da177e4 LT |
2399 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
2400 | imr.imr_address.s_addr = msf->imsf_interface; | |
2401 | imr.imr_ifindex = 0; | |
877acedc | 2402 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2403 | |
2404 | if (!in_dev) { | |
2405 | err = -ENODEV; | |
2406 | goto done; | |
2407 | } | |
2408 | err = -EADDRNOTAVAIL; | |
2409 | ||
1d7138de | 2410 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2411 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2412 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2413 | break; | |
2414 | } | |
2415 | if (!pmc) /* must have a prior join */ | |
2416 | goto done; | |
2417 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2418 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2419 | if (!psl) { |
2420 | len = 0; | |
2421 | count = 0; | |
2422 | } else { | |
2423 | count = psl->sl_count; | |
2424 | } | |
2425 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2426 | len = copycount * sizeof(psl->sl_addr[0]); | |
2427 | msf->imsf_numsrc = count; | |
2428 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2429 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2430 | return -EFAULT; | |
2431 | } | |
2432 | if (len && | |
2433 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2434 | return -EFAULT; | |
2435 | return 0; | |
2436 | done: | |
1da177e4 LT |
2437 | return err; |
2438 | } | |
2439 | ||
2440 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2441 | struct group_filter __user *optval, int __user *optlen) | |
2442 | { | |
2443 | int err, i, count, copycount; | |
2444 | struct sockaddr_in *psin; | |
63007727 | 2445 | __be32 addr; |
1da177e4 LT |
2446 | struct ip_mc_socklist *pmc; |
2447 | struct inet_sock *inet = inet_sk(sk); | |
2448 | struct ip_sf_socklist *psl; | |
2449 | ||
87e9f031 WC |
2450 | ASSERT_RTNL(); |
2451 | ||
1da177e4 LT |
2452 | psin = (struct sockaddr_in *)&gsf->gf_group; |
2453 | if (psin->sin_family != AF_INET) | |
2454 | return -EINVAL; | |
2455 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2456 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2457 | return -EINVAL; |
2458 | ||
1da177e4 LT |
2459 | err = -EADDRNOTAVAIL; |
2460 | ||
1d7138de | 2461 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2462 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2463 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2464 | break; | |
2465 | } | |
2466 | if (!pmc) /* must have a prior join */ | |
2467 | goto done; | |
2468 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2469 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2470 | count = psl ? psl->sl_count : 0; |
2471 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2472 | gsf->gf_numsrc = count; | |
2473 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2474 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2475 | return -EFAULT; | |
2476 | } | |
c71151f0 | 2477 | for (i = 0; i < copycount; i++) { |
1da177e4 LT |
2478 | struct sockaddr_storage ss; |
2479 | ||
2480 | psin = (struct sockaddr_in *)&ss; | |
2481 | memset(&ss, 0, sizeof(ss)); | |
2482 | psin->sin_family = AF_INET; | |
2483 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2484 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2485 | return -EFAULT; | |
2486 | } | |
2487 | return 0; | |
2488 | done: | |
1da177e4 LT |
2489 | return err; |
2490 | } | |
2491 | ||
2492 | /* | |
2493 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2494 | */ | |
c0cda068 | 2495 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2496 | { |
2497 | struct inet_sock *inet = inet_sk(sk); | |
2498 | struct ip_mc_socklist *pmc; | |
2499 | struct ip_sf_socklist *psl; | |
2500 | int i; | |
c85bb41e | 2501 | int ret; |
1da177e4 | 2502 | |
c85bb41e | 2503 | ret = 1; |
f97c1e0c | 2504 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2505 | goto out; |
1da177e4 | 2506 | |
c85bb41e | 2507 | rcu_read_lock(); |
1d7138de | 2508 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2509 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2510 | pmc->multi.imr_ifindex == dif) | |
2511 | break; | |
2512 | } | |
c85bb41e | 2513 | ret = inet->mc_all; |
1da177e4 | 2514 | if (!pmc) |
c85bb41e | 2515 | goto unlock; |
1d7138de | 2516 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2517 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2518 | if (!psl) |
c85bb41e | 2519 | goto unlock; |
1da177e4 | 2520 | |
c71151f0 | 2521 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2522 | if (psl->sl_addr[i] == rmt_addr) |
2523 | break; | |
2524 | } | |
c85bb41e | 2525 | ret = 0; |
1da177e4 | 2526 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2527 | goto unlock; |
1da177e4 | 2528 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2529 | goto unlock; |
2530 | ret = 1; | |
2531 | unlock: | |
2532 | rcu_read_unlock(); | |
2533 | out: | |
2534 | return ret; | |
1da177e4 LT |
2535 | } |
2536 | ||
2537 | /* | |
2538 | * A socket is closing. | |
2539 | */ | |
2540 | ||
2541 | void ip_mc_drop_socket(struct sock *sk) | |
2542 | { | |
2543 | struct inet_sock *inet = inet_sk(sk); | |
2544 | struct ip_mc_socklist *iml; | |
877acedc | 2545 | struct net *net = sock_net(sk); |
1da177e4 | 2546 | |
51456b29 | 2547 | if (!inet->mc_list) |
1da177e4 LT |
2548 | return; |
2549 | ||
2550 | rtnl_lock(); | |
1d7138de | 2551 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2552 | struct in_device *in_dev; |
1da177e4 | 2553 | |
1d7138de | 2554 | inet->mc_list = iml->next_rcu; |
877acedc | 2555 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2556 | (void) ip_mc_leave_src(sk, iml, in_dev); |
00db4124 | 2557 | if (in_dev) |
1da177e4 | 2558 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2559 | /* decrease mem now to avoid the memleak warning */ |
2560 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2561 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2562 | } |
2563 | rtnl_unlock(); | |
2564 | } | |
2565 | ||
dbdd9a52 | 2566 | /* called with rcu_read_lock() */ |
2094acbb | 2567 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
1da177e4 LT |
2568 | { |
2569 | struct ip_mc_list *im; | |
e9897071 | 2570 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2571 | struct ip_sf_list *psf; |
2572 | int rv = 0; | |
2573 | ||
e9897071 ED |
2574 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2575 | if (mc_hash) { | |
c70eba74 | 2576 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2577 | |
2578 | for (im = rcu_dereference(mc_hash[hash]); | |
2579 | im != NULL; | |
2580 | im = rcu_dereference(im->next_hash)) { | |
2581 | if (im->multiaddr == mc_addr) | |
2582 | break; | |
2583 | } | |
2584 | } else { | |
2585 | for_each_pmc_rcu(in_dev, im) { | |
2586 | if (im->multiaddr == mc_addr) | |
2587 | break; | |
2588 | } | |
1da177e4 LT |
2589 | } |
2590 | if (im && proto == IPPROTO_IGMP) { | |
2591 | rv = 1; | |
2592 | } else if (im) { | |
2593 | if (src_addr) { | |
c71151f0 | 2594 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2595 | if (psf->sf_inaddr == src_addr) |
2596 | break; | |
2597 | } | |
2598 | if (psf) | |
2599 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2600 | psf->sf_count[MCAST_EXCLUDE] != | |
2601 | im->sfcount[MCAST_EXCLUDE]; | |
2602 | else | |
2603 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2604 | } else | |
2605 | rv = 1; /* unspecified source; tentatively allow */ | |
2606 | } | |
1da177e4 LT |
2607 | return rv; |
2608 | } | |
2609 | ||
2610 | #if defined(CONFIG_PROC_FS) | |
2611 | struct igmp_mc_iter_state { | |
7091e728 | 2612 | struct seq_net_private p; |
1da177e4 LT |
2613 | struct net_device *dev; |
2614 | struct in_device *in_dev; | |
2615 | }; | |
2616 | ||
2617 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2618 | ||
2619 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2620 | { | |
7091e728 | 2621 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2622 | struct ip_mc_list *im = NULL; |
2623 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2624 | ||
7562f876 | 2625 | state->in_dev = NULL; |
61fbab77 | 2626 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2627 | struct in_device *in_dev; |
6baff150 ED |
2628 | |
2629 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2630 | if (!in_dev) |
2631 | continue; | |
1d7138de | 2632 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2633 | if (im) { |
2634 | state->in_dev = in_dev; | |
2635 | break; | |
2636 | } | |
1da177e4 LT |
2637 | } |
2638 | return im; | |
2639 | } | |
2640 | ||
2641 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2642 | { | |
2643 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2644 | |
1d7138de ED |
2645 | im = rcu_dereference(im->next_rcu); |
2646 | while (!im) { | |
6baff150 | 2647 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2648 | if (!state->dev) { |
2649 | state->in_dev = NULL; | |
2650 | break; | |
2651 | } | |
6baff150 | 2652 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2653 | if (!state->in_dev) |
2654 | continue; | |
1d7138de | 2655 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2656 | } |
2657 | return im; | |
2658 | } | |
2659 | ||
2660 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2661 | { | |
2662 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2663 | if (im) | |
2664 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2665 | --pos; | |
2666 | return pos ? NULL : im; | |
2667 | } | |
2668 | ||
2669 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2670 | __acquires(rcu) |
1da177e4 | 2671 | { |
61fbab77 | 2672 | rcu_read_lock(); |
1da177e4 LT |
2673 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2674 | } | |
2675 | ||
2676 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2677 | { | |
2678 | struct ip_mc_list *im; | |
2679 | if (v == SEQ_START_TOKEN) | |
2680 | im = igmp_mc_get_first(seq); | |
2681 | else | |
2682 | im = igmp_mc_get_next(seq, v); | |
2683 | ++*pos; | |
2684 | return im; | |
2685 | } | |
2686 | ||
2687 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2688 | __releases(rcu) |
1da177e4 LT |
2689 | { |
2690 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2691 | |
2692 | state->in_dev = NULL; | |
1da177e4 | 2693 | state->dev = NULL; |
61fbab77 | 2694 | rcu_read_unlock(); |
1da177e4 LT |
2695 | } |
2696 | ||
2697 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2698 | { | |
2699 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2700 | seq_puts(seq, |
1da177e4 LT |
2701 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2702 | else { | |
2703 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2704 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2705 | char *querier; | |
a399a805 ED |
2706 | long delta; |
2707 | ||
1da177e4 LT |
2708 | #ifdef CONFIG_IP_MULTICAST |
2709 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2710 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2711 | "V3"; | |
2712 | #else | |
2713 | querier = "NONE"; | |
2714 | #endif | |
2715 | ||
e6b68883 | 2716 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2717 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2718 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2719 | } |
2720 | ||
a399a805 | 2721 | delta = im->timer.expires - jiffies; |
1da177e4 | 2722 | seq_printf(seq, |
338fcf98 | 2723 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2724 | im->multiaddr, im->users, |
a399a805 ED |
2725 | im->tm_running, |
2726 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2727 | im->reporter); |
2728 | } | |
2729 | return 0; | |
2730 | } | |
2731 | ||
f690808e | 2732 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2733 | .start = igmp_mc_seq_start, |
2734 | .next = igmp_mc_seq_next, | |
2735 | .stop = igmp_mc_seq_stop, | |
2736 | .show = igmp_mc_seq_show, | |
2737 | }; | |
2738 | ||
2739 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2740 | { | |
7091e728 | 2741 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2742 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2743 | } |
2744 | ||
9a32144e | 2745 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2746 | .owner = THIS_MODULE, |
2747 | .open = igmp_mc_seq_open, | |
2748 | .read = seq_read, | |
2749 | .llseek = seq_lseek, | |
7091e728 | 2750 | .release = seq_release_net, |
1da177e4 LT |
2751 | }; |
2752 | ||
2753 | struct igmp_mcf_iter_state { | |
7091e728 | 2754 | struct seq_net_private p; |
1da177e4 LT |
2755 | struct net_device *dev; |
2756 | struct in_device *idev; | |
2757 | struct ip_mc_list *im; | |
2758 | }; | |
2759 | ||
2760 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2761 | ||
2762 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2763 | { | |
7091e728 | 2764 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2765 | struct ip_sf_list *psf = NULL; |
2766 | struct ip_mc_list *im = NULL; | |
2767 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2768 | ||
7562f876 PE |
2769 | state->idev = NULL; |
2770 | state->im = NULL; | |
61fbab77 | 2771 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2772 | struct in_device *idev; |
6baff150 | 2773 | idev = __in_dev_get_rcu(state->dev); |
51456b29 | 2774 | if (unlikely(!idev)) |
1da177e4 | 2775 | continue; |
1d7138de | 2776 | im = rcu_dereference(idev->mc_list); |
00db4124 | 2777 | if (likely(im)) { |
1da177e4 LT |
2778 | spin_lock_bh(&im->lock); |
2779 | psf = im->sources; | |
00db4124 | 2780 | if (likely(psf)) { |
1da177e4 LT |
2781 | state->im = im; |
2782 | state->idev = idev; | |
2783 | break; | |
2784 | } | |
2785 | spin_unlock_bh(&im->lock); | |
2786 | } | |
1da177e4 LT |
2787 | } |
2788 | return psf; | |
2789 | } | |
2790 | ||
2791 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2792 | { | |
2793 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2794 | ||
2795 | psf = psf->sf_next; | |
2796 | while (!psf) { | |
2797 | spin_unlock_bh(&state->im->lock); | |
2798 | state->im = state->im->next; | |
2799 | while (!state->im) { | |
6baff150 | 2800 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2801 | if (!state->dev) { |
2802 | state->idev = NULL; | |
2803 | goto out; | |
2804 | } | |
6baff150 | 2805 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2806 | if (!state->idev) |
2807 | continue; | |
1d7138de | 2808 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2809 | } |
2810 | if (!state->im) | |
2811 | break; | |
2812 | spin_lock_bh(&state->im->lock); | |
2813 | psf = state->im->sources; | |
2814 | } | |
2815 | out: | |
2816 | return psf; | |
2817 | } | |
2818 | ||
2819 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2820 | { | |
2821 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2822 | if (psf) | |
2823 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2824 | --pos; | |
2825 | return pos ? NULL : psf; | |
2826 | } | |
2827 | ||
2828 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2829 | __acquires(rcu) |
1da177e4 | 2830 | { |
61fbab77 | 2831 | rcu_read_lock(); |
1da177e4 LT |
2832 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2833 | } | |
2834 | ||
2835 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2836 | { | |
2837 | struct ip_sf_list *psf; | |
2838 | if (v == SEQ_START_TOKEN) | |
2839 | psf = igmp_mcf_get_first(seq); | |
2840 | else | |
2841 | psf = igmp_mcf_get_next(seq, v); | |
2842 | ++*pos; | |
2843 | return psf; | |
2844 | } | |
2845 | ||
2846 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2847 | __releases(rcu) |
1da177e4 LT |
2848 | { |
2849 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
00db4124 | 2850 | if (likely(state->im)) { |
1da177e4 LT |
2851 | spin_unlock_bh(&state->im->lock); |
2852 | state->im = NULL; | |
2853 | } | |
1d7138de | 2854 | state->idev = NULL; |
1da177e4 | 2855 | state->dev = NULL; |
61fbab77 | 2856 | rcu_read_unlock(); |
1da177e4 LT |
2857 | } |
2858 | ||
2859 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2860 | { | |
2861 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2862 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2863 | ||
2864 | if (v == SEQ_START_TOKEN) { | |
1744bea1 | 2865 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
1da177e4 LT |
2866 | } else { |
2867 | seq_printf(seq, | |
2868 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2869 | "0x%08x %6lu %6lu\n", |
2870 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2871 | ntohl(state->im->multiaddr), |
2872 | ntohl(psf->sf_inaddr), | |
2873 | psf->sf_count[MCAST_INCLUDE], | |
2874 | psf->sf_count[MCAST_EXCLUDE]); | |
2875 | } | |
2876 | return 0; | |
2877 | } | |
2878 | ||
f690808e | 2879 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2880 | .start = igmp_mcf_seq_start, |
2881 | .next = igmp_mcf_seq_next, | |
2882 | .stop = igmp_mcf_seq_stop, | |
2883 | .show = igmp_mcf_seq_show, | |
2884 | }; | |
2885 | ||
2886 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2887 | { | |
7091e728 | 2888 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2889 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2890 | } |
2891 | ||
9a32144e | 2892 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2893 | .owner = THIS_MODULE, |
2894 | .open = igmp_mcf_seq_open, | |
2895 | .read = seq_read, | |
2896 | .llseek = seq_lseek, | |
7091e728 | 2897 | .release = seq_release_net, |
1da177e4 LT |
2898 | }; |
2899 | ||
2c8c1e72 | 2900 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2901 | { |
7091e728 | 2902 | struct proc_dir_entry *pde; |
93a714d6 | 2903 | int err; |
7091e728 | 2904 | |
d4beaa66 | 2905 | pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); |
7091e728 AD |
2906 | if (!pde) |
2907 | goto out_igmp; | |
d4beaa66 G |
2908 | pde = proc_create("mcfilter", S_IRUGO, net->proc_net, |
2909 | &igmp_mcf_seq_fops); | |
7091e728 AD |
2910 | if (!pde) |
2911 | goto out_mcfilter; | |
93a714d6 MC |
2912 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
2913 | SOCK_DGRAM, 0, net); | |
2914 | if (err < 0) { | |
2915 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
2916 | err); | |
2917 | goto out_sock; | |
2918 | } | |
2919 | ||
1da177e4 | 2920 | return 0; |
7091e728 | 2921 | |
93a714d6 MC |
2922 | out_sock: |
2923 | remove_proc_entry("mcfilter", net->proc_net); | |
7091e728 | 2924 | out_mcfilter: |
ece31ffd | 2925 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
2926 | out_igmp: |
2927 | return -ENOMEM; | |
2928 | } | |
2929 | ||
2c8c1e72 | 2930 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 2931 | { |
ece31ffd G |
2932 | remove_proc_entry("mcfilter", net->proc_net); |
2933 | remove_proc_entry("igmp", net->proc_net); | |
93a714d6 | 2934 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
7091e728 AD |
2935 | } |
2936 | ||
2937 | static struct pernet_operations igmp_net_ops = { | |
2938 | .init = igmp_net_init, | |
2939 | .exit = igmp_net_exit, | |
2940 | }; | |
72c1d3bd | 2941 | #endif |
7091e728 | 2942 | |
4aa5dee4 JP |
2943 | static int igmp_netdev_event(struct notifier_block *this, |
2944 | unsigned long event, void *ptr) | |
2945 | { | |
2946 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
2947 | struct in_device *in_dev; | |
2948 | ||
2949 | switch (event) { | |
2950 | case NETDEV_RESEND_IGMP: | |
2951 | in_dev = __in_dev_get_rtnl(dev); | |
2952 | if (in_dev) | |
2953 | ip_mc_rejoin_groups(in_dev); | |
2954 | break; | |
2955 | default: | |
2956 | break; | |
2957 | } | |
2958 | return NOTIFY_DONE; | |
2959 | } | |
2960 | ||
2961 | static struct notifier_block igmp_notifier = { | |
2962 | .notifier_call = igmp_netdev_event, | |
2963 | }; | |
2964 | ||
72c1d3bd | 2965 | int __init igmp_mc_init(void) |
7091e728 | 2966 | { |
72c1d3bd | 2967 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
2968 | int err; |
2969 | ||
2970 | err = register_pernet_subsys(&igmp_net_ops); | |
2971 | if (err) | |
2972 | return err; | |
2973 | err = register_netdevice_notifier(&igmp_notifier); | |
2974 | if (err) | |
2975 | goto reg_notif_fail; | |
2976 | return 0; | |
2977 | ||
2978 | reg_notif_fail: | |
2979 | unregister_pernet_subsys(&igmp_net_ops); | |
2980 | return err; | |
72c1d3bd WC |
2981 | #else |
2982 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 2983 | #endif |
72c1d3bd | 2984 | } |