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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 LT |
75 | #include <asm/uaccess.h> |
76 | #include <asm/system.h> | |
77 | #include <linux/types.h> | |
78 | #include <linux/kernel.h> | |
79 | #include <linux/jiffies.h> | |
80 | #include <linux/string.h> | |
81 | #include <linux/socket.h> | |
82 | #include <linux/sockios.h> | |
83 | #include <linux/in.h> | |
84 | #include <linux/inet.h> | |
85 | #include <linux/netdevice.h> | |
86 | #include <linux/skbuff.h> | |
87 | #include <linux/inetdevice.h> | |
88 | #include <linux/igmp.h> | |
89 | #include <linux/if_arp.h> | |
90 | #include <linux/rtnetlink.h> | |
91 | #include <linux/times.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> | |
100 | #include <linux/netfilter_ipv4.h> | |
101 | #ifdef CONFIG_IP_MROUTE | |
102 | #include <linux/mroute.h> | |
103 | #endif | |
104 | #ifdef CONFIG_PROC_FS | |
105 | #include <linux/proc_fs.h> | |
106 | #include <linux/seq_file.h> | |
107 | #endif | |
108 | ||
109 | #define IP_MAX_MEMBERSHIPS 20 | |
110 | #define IP_MAX_MSF 10 | |
111 | ||
112 | #ifdef CONFIG_IP_MULTICAST | |
113 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
114 | ||
115 | #define IGMP_V1_Router_Present_Timeout (400*HZ) | |
116 | #define IGMP_V2_Router_Present_Timeout (400*HZ) | |
117 | #define IGMP_Unsolicited_Report_Interval (10*HZ) | |
118 | #define IGMP_Query_Response_Interval (10*HZ) | |
119 | #define IGMP_Unsolicited_Report_Count 2 | |
120 | ||
121 | ||
122 | #define IGMP_Initial_Report_Delay (1) | |
123 | ||
124 | /* IGMP_Initial_Report_Delay is not from IGMP specs! | |
125 | * IGMP specs require to report membership immediately after | |
126 | * joining a group, but we delay the first report by a | |
127 | * small interval. It seems more natural and still does not | |
128 | * contradict to specs provided this delay is small enough. | |
129 | */ | |
130 | ||
42f811b8 | 131 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 132 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
133 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
134 | ((in_dev)->mr_v1_seen && \ | |
135 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
136 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 137 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
138 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
139 | ((in_dev)->mr_v2_seen && \ | |
140 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 LT |
141 | |
142 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); | |
63007727 | 143 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); |
1da177e4 LT |
144 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
145 | static int sf_setstate(struct ip_mc_list *pmc); | |
146 | static void sf_markstate(struct ip_mc_list *pmc); | |
147 | #endif | |
148 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
149 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
150 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 | 151 | |
1d7138de ED |
152 | |
153 | static void ip_mc_list_reclaim(struct rcu_head *head) | |
154 | { | |
155 | kfree(container_of(head, struct ip_mc_list, rcu)); | |
156 | } | |
157 | ||
1da177e4 LT |
158 | static void ip_ma_put(struct ip_mc_list *im) |
159 | { | |
160 | if (atomic_dec_and_test(&im->refcnt)) { | |
161 | in_dev_put(im->interface); | |
1d7138de | 162 | call_rcu(&im->rcu, ip_mc_list_reclaim); |
1da177e4 LT |
163 | } |
164 | } | |
165 | ||
d9aa9380 DM |
166 | #define for_each_pmc_rcu(in_dev, pmc) \ |
167 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
168 | pmc != NULL; \ | |
169 | pmc = rcu_dereference(pmc->next_rcu)) | |
170 | ||
171 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
172 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
173 | pmc != NULL; \ | |
174 | pmc = rtnl_dereference(pmc->next_rcu)) | |
175 | ||
1da177e4 LT |
176 | #ifdef CONFIG_IP_MULTICAST |
177 | ||
178 | /* | |
179 | * Timer management | |
180 | */ | |
181 | ||
1d7138de | 182 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
183 | { |
184 | spin_lock_bh(&im->lock); | |
185 | if (del_timer(&im->timer)) | |
186 | atomic_dec(&im->refcnt); | |
a7e9ff73 | 187 | im->tm_running = 0; |
1da177e4 LT |
188 | im->reporter = 0; |
189 | im->unsolicit_count = 0; | |
190 | spin_unlock_bh(&im->lock); | |
191 | } | |
192 | ||
193 | /* It must be called with locked im->lock */ | |
194 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
195 | { | |
a7e9ff73 | 196 | int tv = net_random() % max_delay; |
1da177e4 | 197 | |
a7e9ff73 | 198 | im->tm_running = 1; |
1da177e4 LT |
199 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
200 | atomic_inc(&im->refcnt); | |
201 | } | |
202 | ||
203 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
204 | { | |
205 | int tv = net_random() % in_dev->mr_maxdelay; | |
206 | ||
207 | in_dev->mr_gq_running = 1; | |
208 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
209 | in_dev_hold(in_dev); | |
210 | } | |
211 | ||
212 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
213 | { | |
214 | int tv = net_random() % delay; | |
215 | ||
216 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
217 | in_dev_hold(in_dev); | |
218 | } | |
219 | ||
220 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
221 | { | |
222 | spin_lock_bh(&im->lock); | |
223 | im->unsolicit_count = 0; | |
224 | if (del_timer(&im->timer)) { | |
225 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
226 | add_timer(&im->timer); | |
a7e9ff73 | 227 | im->tm_running = 1; |
1da177e4 LT |
228 | spin_unlock_bh(&im->lock); |
229 | return; | |
230 | } | |
231 | atomic_dec(&im->refcnt); | |
232 | } | |
233 | igmp_start_timer(im, max_delay); | |
234 | spin_unlock_bh(&im->lock); | |
235 | } | |
236 | ||
237 | ||
238 | /* | |
239 | * Send an IGMP report. | |
240 | */ | |
241 | ||
242 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
243 | ||
244 | ||
245 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
246 | int gdeleted, int sdeleted) | |
247 | { | |
248 | switch (type) { | |
249 | case IGMPV3_MODE_IS_INCLUDE: | |
250 | case IGMPV3_MODE_IS_EXCLUDE: | |
251 | if (gdeleted || sdeleted) | |
252 | return 0; | |
ad12583f DS |
253 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
254 | if (pmc->sfmode == MCAST_INCLUDE) | |
255 | return 1; | |
256 | /* don't include if this source is excluded | |
257 | * in all filters | |
258 | */ | |
259 | if (psf->sf_count[MCAST_INCLUDE]) | |
260 | return type == IGMPV3_MODE_IS_INCLUDE; | |
261 | return pmc->sfcount[MCAST_EXCLUDE] == | |
262 | psf->sf_count[MCAST_EXCLUDE]; | |
263 | } | |
264 | return 0; | |
1da177e4 LT |
265 | case IGMPV3_CHANGE_TO_INCLUDE: |
266 | if (gdeleted || sdeleted) | |
267 | return 0; | |
268 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
269 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
270 | if (gdeleted || sdeleted) | |
271 | return 0; | |
272 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
273 | psf->sf_count[MCAST_INCLUDE]) | |
274 | return 0; | |
275 | return pmc->sfcount[MCAST_EXCLUDE] == | |
276 | psf->sf_count[MCAST_EXCLUDE]; | |
277 | case IGMPV3_ALLOW_NEW_SOURCES: | |
278 | if (gdeleted || !psf->sf_crcount) | |
279 | return 0; | |
280 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
281 | case IGMPV3_BLOCK_OLD_SOURCES: | |
282 | if (pmc->sfmode == MCAST_INCLUDE) | |
283 | return gdeleted || (psf->sf_crcount && sdeleted); | |
284 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
285 | } | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static int | |
290 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
291 | { | |
292 | struct ip_sf_list *psf; | |
293 | int scount = 0; | |
294 | ||
295 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
296 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) | |
297 | continue; | |
298 | scount++; | |
299 | } | |
300 | return scount; | |
301 | } | |
302 | ||
57e1ab6e ED |
303 | #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb)) |
304 | ||
1da177e4 LT |
305 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) |
306 | { | |
307 | struct sk_buff *skb; | |
308 | struct rtable *rt; | |
309 | struct iphdr *pip; | |
310 | struct igmpv3_report *pig; | |
877acedc | 311 | struct net *net = dev_net(dev); |
1da177e4 | 312 | |
57e1ab6e ED |
313 | while (1) { |
314 | skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), | |
315 | GFP_ATOMIC | __GFP_NOWARN); | |
316 | if (skb) | |
317 | break; | |
318 | size >>= 1; | |
319 | if (size < 256) | |
320 | return NULL; | |
321 | } | |
322 | igmp_skb_size(skb) = size; | |
1da177e4 LT |
323 | |
324 | { | |
325 | struct flowi fl = { .oif = dev->ifindex, | |
5811662b | 326 | .fl4_dst = IGMPV3_ALL_MCR, |
1da177e4 | 327 | .proto = IPPROTO_IGMP }; |
877acedc | 328 | if (ip_route_output_key(net, &rt, &fl)) { |
1da177e4 LT |
329 | kfree_skb(skb); |
330 | return NULL; | |
331 | } | |
332 | } | |
333 | if (rt->rt_src == 0) { | |
334 | kfree_skb(skb); | |
335 | ip_rt_put(rt); | |
336 | return NULL; | |
337 | } | |
338 | ||
d8d1f30b | 339 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
340 | skb->dev = dev; |
341 | ||
342 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
343 | ||
7e28ecc2 | 344 | skb_reset_network_header(skb); |
eddc9ec5 | 345 | pip = ip_hdr(skb); |
7e28ecc2 | 346 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
347 | |
348 | pip->version = 4; | |
349 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
350 | pip->tos = 0xc0; | |
351 | pip->frag_off = htons(IP_DF); | |
352 | pip->ttl = 1; | |
353 | pip->daddr = rt->rt_dst; | |
354 | pip->saddr = rt->rt_src; | |
355 | pip->protocol = IPPROTO_IGMP; | |
356 | pip->tot_len = 0; /* filled in later */ | |
d8d1f30b | 357 | ip_select_ident(pip, &rt->dst, NULL); |
1da177e4 LT |
358 | ((u8*)&pip[1])[0] = IPOPT_RA; |
359 | ((u8*)&pip[1])[1] = 4; | |
360 | ((u8*)&pip[1])[2] = 0; | |
361 | ((u8*)&pip[1])[3] = 0; | |
362 | ||
b0e380b1 | 363 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 364 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 365 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
366 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
367 | pig->resv1 = 0; | |
368 | pig->csum = 0; | |
369 | pig->resv2 = 0; | |
370 | pig->ngrec = 0; | |
371 | return skb; | |
372 | } | |
373 | ||
374 | static int igmpv3_sendpack(struct sk_buff *skb) | |
375 | { | |
d9edf9e2 | 376 | struct igmphdr *pig = igmp_hdr(skb); |
27a884dc | 377 | const int igmplen = skb->tail - skb->transport_header; |
1da177e4 | 378 | |
d9edf9e2 | 379 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 380 | |
c439cb2e | 381 | return ip_local_out(skb); |
1da177e4 LT |
382 | } |
383 | ||
384 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
385 | { | |
a7e9ff73 | 386 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
387 | } |
388 | ||
389 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
390 | int type, struct igmpv3_grec **ppgr) | |
391 | { | |
392 | struct net_device *dev = pmc->interface->dev; | |
393 | struct igmpv3_report *pih; | |
394 | struct igmpv3_grec *pgr; | |
395 | ||
396 | if (!skb) | |
397 | skb = igmpv3_newpack(dev, dev->mtu); | |
398 | if (!skb) | |
399 | return NULL; | |
400 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
401 | pgr->grec_type = type; | |
402 | pgr->grec_auxwords = 0; | |
403 | pgr->grec_nsrcs = 0; | |
404 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 405 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
406 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
407 | *ppgr = pgr; | |
408 | return skb; | |
409 | } | |
410 | ||
57e1ab6e | 411 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \ |
1da177e4 LT |
412 | skb_tailroom(skb)) : 0) |
413 | ||
414 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
415 | int type, int gdeleted, int sdeleted) | |
416 | { | |
417 | struct net_device *dev = pmc->interface->dev; | |
418 | struct igmpv3_report *pih; | |
419 | struct igmpv3_grec *pgr = NULL; | |
420 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 421 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
422 | |
423 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
424 | return skb; | |
425 | ||
426 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
427 | type == IGMPV3_MODE_IS_EXCLUDE; | |
428 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
429 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
430 | ||
ad12583f DS |
431 | stotal = scount = 0; |
432 | ||
1da177e4 LT |
433 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
434 | ||
ad12583f DS |
435 | if (!*psf_list) |
436 | goto empty_source; | |
437 | ||
d9edf9e2 | 438 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
439 | |
440 | /* EX and TO_EX get a fresh packet, if needed */ | |
441 | if (truncate) { | |
442 | if (pih && pih->ngrec && | |
443 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
444 | if (skb) | |
445 | igmpv3_sendpack(skb); | |
446 | skb = igmpv3_newpack(dev, dev->mtu); | |
447 | } | |
448 | } | |
449 | first = 1; | |
1da177e4 LT |
450 | psf_prev = NULL; |
451 | for (psf=*psf_list; psf; psf=psf_next) { | |
ea4d9e72 | 452 | __be32 *psrc; |
1da177e4 LT |
453 | |
454 | psf_next = psf->sf_next; | |
455 | ||
456 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
457 | psf_prev = psf; | |
458 | continue; | |
459 | } | |
460 | ||
461 | /* clear marks on query responses */ | |
462 | if (isquery) | |
463 | psf->sf_gsresp = 0; | |
464 | ||
63007727 | 465 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
466 | first*sizeof(struct igmpv3_grec)) { |
467 | if (truncate && !first) | |
468 | break; /* truncate these */ | |
469 | if (pgr) | |
470 | pgr->grec_nsrcs = htons(scount); | |
471 | if (skb) | |
472 | igmpv3_sendpack(skb); | |
473 | skb = igmpv3_newpack(dev, dev->mtu); | |
474 | first = 1; | |
475 | scount = 0; | |
476 | } | |
477 | if (first) { | |
478 | skb = add_grhead(skb, pmc, type, &pgr); | |
479 | first = 0; | |
480 | } | |
cc63f70b AD |
481 | if (!skb) |
482 | return NULL; | |
63007727 | 483 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 484 | *psrc = psf->sf_inaddr; |
ad12583f | 485 | scount++; stotal++; |
1da177e4 LT |
486 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
487 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
488 | psf->sf_crcount--; | |
489 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
490 | if (psf_prev) | |
491 | psf_prev->sf_next = psf->sf_next; | |
492 | else | |
493 | *psf_list = psf->sf_next; | |
494 | kfree(psf); | |
495 | continue; | |
496 | } | |
497 | } | |
498 | psf_prev = psf; | |
499 | } | |
ad12583f DS |
500 | |
501 | empty_source: | |
502 | if (!stotal) { | |
503 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
504 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
505 | return skb; | |
506 | if (pmc->crcount || isquery) { | |
507 | /* make sure we have room for group header */ | |
508 | if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { | |
509 | igmpv3_sendpack(skb); | |
510 | skb = NULL; /* add_grhead will get a new one */ | |
511 | } | |
512 | skb = add_grhead(skb, pmc, type, &pgr); | |
513 | } | |
514 | } | |
1da177e4 LT |
515 | if (pgr) |
516 | pgr->grec_nsrcs = htons(scount); | |
517 | ||
518 | if (isquery) | |
519 | pmc->gsquery = 0; /* clear query state on report */ | |
520 | return skb; | |
521 | } | |
522 | ||
523 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
524 | { | |
525 | struct sk_buff *skb = NULL; | |
526 | int type; | |
527 | ||
528 | if (!pmc) { | |
1d7138de ED |
529 | rcu_read_lock(); |
530 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
531 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
532 | continue; | |
533 | spin_lock_bh(&pmc->lock); | |
534 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
535 | type = IGMPV3_MODE_IS_EXCLUDE; | |
536 | else | |
537 | type = IGMPV3_MODE_IS_INCLUDE; | |
538 | skb = add_grec(skb, pmc, type, 0, 0); | |
539 | spin_unlock_bh(&pmc->lock); | |
540 | } | |
1d7138de | 541 | rcu_read_unlock(); |
1da177e4 LT |
542 | } else { |
543 | spin_lock_bh(&pmc->lock); | |
544 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
545 | type = IGMPV3_MODE_IS_EXCLUDE; | |
546 | else | |
547 | type = IGMPV3_MODE_IS_INCLUDE; | |
548 | skb = add_grec(skb, pmc, type, 0, 0); | |
549 | spin_unlock_bh(&pmc->lock); | |
550 | } | |
551 | if (!skb) | |
552 | return 0; | |
553 | return igmpv3_sendpack(skb); | |
554 | } | |
555 | ||
556 | /* | |
557 | * remove zero-count source records from a source filter list | |
558 | */ | |
559 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
560 | { | |
561 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
562 | ||
563 | psf_prev = NULL; | |
564 | for (psf=*ppsf; psf; psf = psf_next) { | |
565 | psf_next = psf->sf_next; | |
566 | if (psf->sf_crcount == 0) { | |
567 | if (psf_prev) | |
568 | psf_prev->sf_next = psf->sf_next; | |
569 | else | |
570 | *ppsf = psf->sf_next; | |
571 | kfree(psf); | |
572 | } else | |
573 | psf_prev = psf; | |
574 | } | |
575 | } | |
576 | ||
577 | static void igmpv3_send_cr(struct in_device *in_dev) | |
578 | { | |
579 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
580 | struct sk_buff *skb = NULL; | |
581 | int type, dtype; | |
582 | ||
1d7138de | 583 | rcu_read_lock(); |
1da177e4 LT |
584 | spin_lock_bh(&in_dev->mc_tomb_lock); |
585 | ||
586 | /* deleted MCA's */ | |
587 | pmc_prev = NULL; | |
588 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { | |
589 | pmc_next = pmc->next; | |
590 | if (pmc->sfmode == MCAST_INCLUDE) { | |
591 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
592 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
593 | skb = add_grec(skb, pmc, type, 1, 0); | |
594 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
595 | } | |
596 | if (pmc->crcount) { | |
1da177e4 LT |
597 | if (pmc->sfmode == MCAST_EXCLUDE) { |
598 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
599 | skb = add_grec(skb, pmc, type, 1, 0); | |
600 | } | |
ad12583f | 601 | pmc->crcount--; |
1da177e4 LT |
602 | if (pmc->crcount == 0) { |
603 | igmpv3_clear_zeros(&pmc->tomb); | |
604 | igmpv3_clear_zeros(&pmc->sources); | |
605 | } | |
606 | } | |
607 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
608 | if (pmc_prev) | |
609 | pmc_prev->next = pmc_next; | |
610 | else | |
611 | in_dev->mc_tomb = pmc_next; | |
612 | in_dev_put(pmc->interface); | |
613 | kfree(pmc); | |
614 | } else | |
615 | pmc_prev = pmc; | |
616 | } | |
617 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
618 | ||
619 | /* change recs */ | |
1d7138de | 620 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
621 | spin_lock_bh(&pmc->lock); |
622 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
623 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
624 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
625 | } else { | |
626 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
627 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
628 | } | |
629 | skb = add_grec(skb, pmc, type, 0, 0); | |
630 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
631 | ||
632 | /* filter mode changes */ | |
633 | if (pmc->crcount) { | |
1da177e4 LT |
634 | if (pmc->sfmode == MCAST_EXCLUDE) |
635 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
636 | else | |
637 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
638 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 639 | pmc->crcount--; |
1da177e4 LT |
640 | } |
641 | spin_unlock_bh(&pmc->lock); | |
642 | } | |
1d7138de | 643 | rcu_read_unlock(); |
1da177e4 LT |
644 | |
645 | if (!skb) | |
646 | return; | |
647 | (void) igmpv3_sendpack(skb); | |
648 | } | |
649 | ||
650 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
651 | int type) | |
652 | { | |
653 | struct sk_buff *skb; | |
654 | struct iphdr *iph; | |
655 | struct igmphdr *ih; | |
656 | struct rtable *rt; | |
657 | struct net_device *dev = in_dev->dev; | |
877acedc | 658 | struct net *net = dev_net(dev); |
63007727 AV |
659 | __be32 group = pmc ? pmc->multiaddr : 0; |
660 | __be32 dst; | |
1da177e4 LT |
661 | |
662 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
663 | return igmpv3_send_report(in_dev, pmc); | |
664 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
665 | dst = IGMP_ALL_ROUTER; | |
666 | else | |
667 | dst = group; | |
668 | ||
669 | { | |
670 | struct flowi fl = { .oif = dev->ifindex, | |
5811662b | 671 | .fl4_dst = dst, |
1da177e4 | 672 | .proto = IPPROTO_IGMP }; |
877acedc | 673 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
674 | return -1; |
675 | } | |
676 | if (rt->rt_src == 0) { | |
677 | ip_rt_put(rt); | |
678 | return -1; | |
679 | } | |
680 | ||
a7e9ff73 | 681 | skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); |
1da177e4 LT |
682 | if (skb == NULL) { |
683 | ip_rt_put(rt); | |
684 | return -1; | |
685 | } | |
686 | ||
d8d1f30b | 687 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
688 | |
689 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
690 | ||
7e28ecc2 | 691 | skb_reset_network_header(skb); |
eddc9ec5 | 692 | iph = ip_hdr(skb); |
7e28ecc2 | 693 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
694 | |
695 | iph->version = 4; | |
696 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
697 | iph->tos = 0xc0; | |
698 | iph->frag_off = htons(IP_DF); | |
699 | iph->ttl = 1; | |
700 | iph->daddr = dst; | |
701 | iph->saddr = rt->rt_src; | |
702 | iph->protocol = IPPROTO_IGMP; | |
d8d1f30b | 703 | ip_select_ident(iph, &rt->dst, NULL); |
1da177e4 LT |
704 | ((u8*)&iph[1])[0] = IPOPT_RA; |
705 | ((u8*)&iph[1])[1] = 4; | |
706 | ((u8*)&iph[1])[2] = 0; | |
707 | ((u8*)&iph[1])[3] = 0; | |
1da177e4 LT |
708 | |
709 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
710 | ih->type = type; |
711 | ih->code = 0; | |
712 | ih->csum = 0; | |
713 | ih->group = group; | |
714 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 715 | |
c439cb2e | 716 | return ip_local_out(skb); |
1da177e4 LT |
717 | } |
718 | ||
719 | static void igmp_gq_timer_expire(unsigned long data) | |
720 | { | |
721 | struct in_device *in_dev = (struct in_device *)data; | |
722 | ||
723 | in_dev->mr_gq_running = 0; | |
724 | igmpv3_send_report(in_dev, NULL); | |
725 | __in_dev_put(in_dev); | |
726 | } | |
727 | ||
728 | static void igmp_ifc_timer_expire(unsigned long data) | |
729 | { | |
730 | struct in_device *in_dev = (struct in_device *)data; | |
731 | ||
732 | igmpv3_send_cr(in_dev); | |
733 | if (in_dev->mr_ifc_count) { | |
734 | in_dev->mr_ifc_count--; | |
735 | igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); | |
736 | } | |
737 | __in_dev_put(in_dev); | |
738 | } | |
739 | ||
740 | static void igmp_ifc_event(struct in_device *in_dev) | |
741 | { | |
742 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
743 | return; | |
e905a9ed | 744 | in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
745 | IGMP_Unsolicited_Report_Count; |
746 | igmp_ifc_start_timer(in_dev, 1); | |
747 | } | |
748 | ||
749 | ||
750 | static void igmp_timer_expire(unsigned long data) | |
751 | { | |
752 | struct ip_mc_list *im=(struct ip_mc_list *)data; | |
753 | struct in_device *in_dev = im->interface; | |
754 | ||
755 | spin_lock(&im->lock); | |
a7e9ff73 | 756 | im->tm_running = 0; |
1da177e4 LT |
757 | |
758 | if (im->unsolicit_count) { | |
759 | im->unsolicit_count--; | |
760 | igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); | |
761 | } | |
762 | im->reporter = 1; | |
763 | spin_unlock(&im->lock); | |
764 | ||
765 | if (IGMP_V1_SEEN(in_dev)) | |
766 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
767 | else if (IGMP_V2_SEEN(in_dev)) | |
768 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
769 | else | |
770 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
771 | ||
772 | ip_ma_put(im); | |
773 | } | |
774 | ||
ad12583f | 775 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 776 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
777 | { |
778 | struct ip_sf_list *psf; | |
779 | int i, scount; | |
780 | ||
ad12583f DS |
781 | scount = 0; |
782 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
783 | if (scount == nsrcs) | |
784 | break; | |
785 | for (i=0; i<nsrcs; i++) { | |
786 | /* skip inactive filters */ | |
787 | if (pmc->sfcount[MCAST_INCLUDE] || | |
788 | pmc->sfcount[MCAST_EXCLUDE] != | |
789 | psf->sf_count[MCAST_EXCLUDE]) | |
790 | continue; | |
791 | if (srcs[i] == psf->sf_inaddr) { | |
792 | scount++; | |
793 | break; | |
794 | } | |
795 | } | |
796 | } | |
797 | pmc->gsquery = 0; | |
798 | if (scount == nsrcs) /* all sources excluded */ | |
799 | return 0; | |
800 | return 1; | |
801 | } | |
802 | ||
ea4d9e72 | 803 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
804 | { |
805 | struct ip_sf_list *psf; | |
806 | int i, scount; | |
807 | ||
808 | if (pmc->sfmode == MCAST_EXCLUDE) | |
809 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
810 | ||
811 | /* mark INCLUDE-mode sources */ | |
1da177e4 LT |
812 | scount = 0; |
813 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
814 | if (scount == nsrcs) | |
815 | break; | |
816 | for (i=0; i<nsrcs; i++) | |
817 | if (srcs[i] == psf->sf_inaddr) { | |
818 | psf->sf_gsresp = 1; | |
819 | scount++; | |
820 | break; | |
821 | } | |
822 | } | |
ad12583f DS |
823 | if (!scount) { |
824 | pmc->gsquery = 0; | |
825 | return 0; | |
826 | } | |
827 | pmc->gsquery = 1; | |
828 | return 1; | |
1da177e4 LT |
829 | } |
830 | ||
63007727 | 831 | static void igmp_heard_report(struct in_device *in_dev, __be32 group) |
1da177e4 LT |
832 | { |
833 | struct ip_mc_list *im; | |
834 | ||
835 | /* Timers are only set for non-local groups */ | |
836 | ||
837 | if (group == IGMP_ALL_HOSTS) | |
838 | return; | |
839 | ||
1d7138de ED |
840 | rcu_read_lock(); |
841 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
842 | if (im->multiaddr == group) { |
843 | igmp_stop_timer(im); | |
844 | break; | |
845 | } | |
846 | } | |
1d7138de | 847 | rcu_read_unlock(); |
1da177e4 LT |
848 | } |
849 | ||
850 | static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
851 | int len) | |
852 | { | |
d9edf9e2 ACM |
853 | struct igmphdr *ih = igmp_hdr(skb); |
854 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 855 | struct ip_mc_list *im; |
63007727 | 856 | __be32 group = ih->group; |
1da177e4 LT |
857 | int max_delay; |
858 | int mark = 0; | |
859 | ||
860 | ||
5b7c8406 | 861 | if (len == 8) { |
1da177e4 LT |
862 | if (ih->code == 0) { |
863 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 864 | |
1da177e4 LT |
865 | max_delay = IGMP_Query_Response_Interval; |
866 | in_dev->mr_v1_seen = jiffies + | |
867 | IGMP_V1_Router_Present_Timeout; | |
868 | group = 0; | |
869 | } else { | |
870 | /* v2 router present */ | |
871 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
872 | in_dev->mr_v2_seen = jiffies + | |
873 | IGMP_V2_Router_Present_Timeout; | |
874 | } | |
875 | /* cancel the interface change timer */ | |
876 | in_dev->mr_ifc_count = 0; | |
877 | if (del_timer(&in_dev->mr_ifc_timer)) | |
878 | __in_dev_put(in_dev); | |
879 | /* clear deleted report items */ | |
880 | igmpv3_clear_delrec(in_dev); | |
881 | } else if (len < 12) { | |
882 | return; /* ignore bogus packet; freed by caller */ | |
5b7c8406 DS |
883 | } else if (IGMP_V1_SEEN(in_dev)) { |
884 | /* This is a v3 query with v1 queriers present */ | |
885 | max_delay = IGMP_Query_Response_Interval; | |
886 | group = 0; | |
887 | } else if (IGMP_V2_SEEN(in_dev)) { | |
888 | /* this is a v3 query with v2 queriers present; | |
889 | * Interpretation of the max_delay code is problematic here. | |
890 | * A real v2 host would use ih_code directly, while v3 has a | |
891 | * different encoding. We use the v3 encoding as more likely | |
892 | * to be intended in a v3 query. | |
893 | */ | |
894 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
1da177e4 LT |
895 | } else { /* v3 */ |
896 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
897 | return; | |
e905a9ed | 898 | |
d9edf9e2 | 899 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 900 | if (ih3->nsrcs) { |
e905a9ed | 901 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 902 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
1da177e4 | 903 | return; |
d9edf9e2 | 904 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
905 | } |
906 | ||
907 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
908 | if (!max_delay) | |
909 | max_delay = 1; /* can't mod w/ 0 */ | |
910 | in_dev->mr_maxdelay = max_delay; | |
911 | if (ih3->qrv) | |
912 | in_dev->mr_qrv = ih3->qrv; | |
913 | if (!group) { /* general query */ | |
914 | if (ih3->nsrcs) | |
915 | return; /* no sources allowed */ | |
916 | igmp_gq_start_timer(in_dev); | |
917 | return; | |
918 | } | |
919 | /* mark sources to include, if group & source-specific */ | |
920 | mark = ih3->nsrcs != 0; | |
921 | } | |
922 | ||
923 | /* | |
924 | * - Start the timers in all of our membership records | |
925 | * that the query applies to for the interface on | |
926 | * which the query arrived excl. those that belong | |
927 | * to a "local" group (224.0.0.X) | |
928 | * - For timers already running check if they need to | |
929 | * be reset. | |
930 | * - Use the igmp->igmp_code field as the maximum | |
931 | * delay possible | |
932 | */ | |
1d7138de ED |
933 | rcu_read_lock(); |
934 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
935 | int changed; |
936 | ||
1da177e4 LT |
937 | if (group && group != im->multiaddr) |
938 | continue; | |
939 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
940 | continue; | |
941 | spin_lock_bh(&im->lock); | |
942 | if (im->tm_running) | |
943 | im->gsquery = im->gsquery && mark; | |
944 | else | |
945 | im->gsquery = mark; | |
ad12583f | 946 | changed = !im->gsquery || |
e905a9ed | 947 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 948 | spin_unlock_bh(&im->lock); |
ad12583f DS |
949 | if (changed) |
950 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 951 | } |
1d7138de | 952 | rcu_read_unlock(); |
1da177e4 LT |
953 | } |
954 | ||
9a57a9d2 | 955 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
956 | int igmp_rcv(struct sk_buff *skb) |
957 | { | |
958 | /* This basically follows the spec line by line -- see RFC1112 */ | |
959 | struct igmphdr *ih; | |
9a57a9d2 | 960 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 LT |
961 | int len = skb->len; |
962 | ||
cd557bc1 DL |
963 | if (in_dev == NULL) |
964 | goto drop; | |
1da177e4 | 965 | |
fb286bb2 | 966 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 967 | goto drop; |
fb286bb2 HX |
968 | |
969 | switch (skb->ip_summed) { | |
84fa7933 | 970 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 971 | if (!csum_fold(skb->csum)) |
fb286bb2 HX |
972 | break; |
973 | /* fall through */ | |
974 | case CHECKSUM_NONE: | |
975 | skb->csum = 0; | |
976 | if (__skb_checksum_complete(skb)) | |
9a57a9d2 | 977 | goto drop; |
1da177e4 LT |
978 | } |
979 | ||
d9edf9e2 | 980 | ih = igmp_hdr(skb); |
1da177e4 LT |
981 | switch (ih->type) { |
982 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
983 | igmp_heard_query(in_dev, skb, len); | |
984 | break; | |
985 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
986 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 987 | /* Is it our report looped back? */ |
c7537967 | 988 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 989 | break; |
24c69275 DS |
990 | /* don't rely on MC router hearing unicast reports */ |
991 | if (skb->pkt_type == PACKET_MULTICAST || | |
992 | skb->pkt_type == PACKET_BROADCAST) | |
993 | igmp_heard_report(in_dev, ih->group); | |
1da177e4 LT |
994 | break; |
995 | case IGMP_PIM: | |
996 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
997 | return pim_rcv_v1(skb); |
998 | #endif | |
c6b471e6 | 999 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1000 | case IGMP_DVMRP: |
1001 | case IGMP_TRACE: | |
1002 | case IGMP_HOST_LEAVE_MESSAGE: | |
1003 | case IGMP_MTRACE: | |
1004 | case IGMP_MTRACE_RESP: | |
1005 | break; | |
1006 | default: | |
dd1c1853 | 1007 | break; |
1da177e4 | 1008 | } |
fb286bb2 | 1009 | |
cd557bc1 | 1010 | drop: |
1da177e4 LT |
1011 | kfree_skb(skb); |
1012 | return 0; | |
1013 | } | |
1014 | ||
1015 | #endif | |
1016 | ||
1017 | ||
1018 | /* | |
1019 | * Add a filter to a device | |
1020 | */ | |
1021 | ||
63007727 | 1022 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1023 | { |
1024 | char buf[MAX_ADDR_LEN]; | |
1025 | struct net_device *dev = in_dev->dev; | |
1026 | ||
1027 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1028 | We will get multicast token leakage, when IFF_MULTICAST | |
1029 | is changed. This check should be done in dev->set_multicast_list | |
1030 | routine. Something sort of: | |
1031 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1032 | --ANK | |
1033 | */ | |
1034 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1035 | dev_mc_add(dev, buf); |
1da177e4 LT |
1036 | } |
1037 | ||
1038 | /* | |
1039 | * Remove a filter from a device | |
1040 | */ | |
1041 | ||
63007727 | 1042 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1043 | { |
1044 | char buf[MAX_ADDR_LEN]; | |
1045 | struct net_device *dev = in_dev->dev; | |
1046 | ||
1047 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1048 | dev_mc_del(dev, buf); |
1da177e4 LT |
1049 | } |
1050 | ||
1051 | #ifdef CONFIG_IP_MULTICAST | |
1052 | /* | |
1053 | * deleted ip_mc_list manipulation | |
1054 | */ | |
1055 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1056 | { | |
1057 | struct ip_mc_list *pmc; | |
1058 | ||
1059 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1060 | * are actually used. In particular, the refcnt and users are not | |
1061 | * used for management of the delete list. Using the same structure | |
1062 | * for deleted items allows change reports to use common code with | |
1063 | * non-deleted or query-response MCA's. | |
1064 | */ | |
0da974f4 | 1065 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1066 | if (!pmc) |
1067 | return; | |
1da177e4 LT |
1068 | spin_lock_bh(&im->lock); |
1069 | pmc->interface = im->interface; | |
1070 | in_dev_hold(in_dev); | |
1071 | pmc->multiaddr = im->multiaddr; | |
1072 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1073 | IGMP_Unsolicited_Report_Count; | |
1074 | pmc->sfmode = im->sfmode; | |
1075 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1076 | struct ip_sf_list *psf; | |
1077 | ||
1078 | pmc->tomb = im->tomb; | |
1079 | pmc->sources = im->sources; | |
1080 | im->tomb = im->sources = NULL; | |
1081 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1082 | psf->sf_crcount = pmc->crcount; | |
1083 | } | |
1084 | spin_unlock_bh(&im->lock); | |
1085 | ||
1086 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1087 | pmc->next = in_dev->mc_tomb; | |
1088 | in_dev->mc_tomb = pmc; | |
1089 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1090 | } | |
1091 | ||
63007727 | 1092 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1093 | { |
1094 | struct ip_mc_list *pmc, *pmc_prev; | |
1095 | struct ip_sf_list *psf, *psf_next; | |
1096 | ||
1097 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1098 | pmc_prev = NULL; | |
1099 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { | |
1100 | if (pmc->multiaddr == multiaddr) | |
1101 | break; | |
1102 | pmc_prev = pmc; | |
1103 | } | |
1104 | if (pmc) { | |
1105 | if (pmc_prev) | |
1106 | pmc_prev->next = pmc->next; | |
1107 | else | |
1108 | in_dev->mc_tomb = pmc->next; | |
1109 | } | |
1110 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1111 | if (pmc) { | |
1112 | for (psf=pmc->tomb; psf; psf=psf_next) { | |
1113 | psf_next = psf->sf_next; | |
1114 | kfree(psf); | |
1115 | } | |
1116 | in_dev_put(pmc->interface); | |
1117 | kfree(pmc); | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1122 | { | |
1123 | struct ip_mc_list *pmc, *nextpmc; | |
1124 | ||
1125 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1126 | pmc = in_dev->mc_tomb; | |
1127 | in_dev->mc_tomb = NULL; | |
1128 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1129 | ||
1130 | for (; pmc; pmc = nextpmc) { | |
1131 | nextpmc = pmc->next; | |
1132 | ip_mc_clear_src(pmc); | |
1133 | in_dev_put(pmc->interface); | |
1134 | kfree(pmc); | |
1135 | } | |
1136 | /* clear dead sources, too */ | |
1d7138de ED |
1137 | rcu_read_lock(); |
1138 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1139 | struct ip_sf_list *psf, *psf_next; |
1140 | ||
1141 | spin_lock_bh(&pmc->lock); | |
1142 | psf = pmc->tomb; | |
1143 | pmc->tomb = NULL; | |
1144 | spin_unlock_bh(&pmc->lock); | |
1145 | for (; psf; psf=psf_next) { | |
1146 | psf_next = psf->sf_next; | |
1147 | kfree(psf); | |
1148 | } | |
1149 | } | |
1d7138de | 1150 | rcu_read_unlock(); |
1da177e4 LT |
1151 | } |
1152 | #endif | |
1153 | ||
1154 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1155 | { | |
1156 | struct in_device *in_dev = im->interface; | |
1157 | #ifdef CONFIG_IP_MULTICAST | |
1158 | int reporter; | |
1159 | #endif | |
1160 | ||
1161 | if (im->loaded) { | |
1162 | im->loaded = 0; | |
1163 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1164 | } | |
1165 | ||
1166 | #ifdef CONFIG_IP_MULTICAST | |
1167 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1168 | return; | |
1169 | ||
1170 | reporter = im->reporter; | |
1171 | igmp_stop_timer(im); | |
1172 | ||
1173 | if (!in_dev->dead) { | |
1174 | if (IGMP_V1_SEEN(in_dev)) | |
1175 | goto done; | |
1176 | if (IGMP_V2_SEEN(in_dev)) { | |
1177 | if (reporter) | |
1178 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
1179 | goto done; | |
1180 | } | |
1181 | /* IGMPv3 */ | |
1182 | igmpv3_add_delrec(in_dev, im); | |
1183 | ||
1184 | igmp_ifc_event(in_dev); | |
1185 | } | |
1186 | done: | |
1187 | #endif | |
1188 | ip_mc_clear_src(im); | |
1189 | } | |
1190 | ||
1191 | static void igmp_group_added(struct ip_mc_list *im) | |
1192 | { | |
1193 | struct in_device *in_dev = im->interface; | |
1194 | ||
1195 | if (im->loaded == 0) { | |
1196 | im->loaded = 1; | |
1197 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1198 | } | |
1199 | ||
1200 | #ifdef CONFIG_IP_MULTICAST | |
1201 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1202 | return; | |
1203 | ||
1204 | if (in_dev->dead) | |
1205 | return; | |
1206 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1207 | spin_lock_bh(&im->lock); | |
1208 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1209 | spin_unlock_bh(&im->lock); | |
1210 | return; | |
1211 | } | |
1212 | /* else, v3 */ | |
1213 | ||
1214 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1215 | IGMP_Unsolicited_Report_Count; | |
1216 | igmp_ifc_event(in_dev); | |
1217 | #endif | |
1218 | } | |
1219 | ||
1220 | ||
1221 | /* | |
1222 | * Multicast list managers | |
1223 | */ | |
1224 | ||
1225 | ||
1226 | /* | |
1227 | * A socket has joined a multicast group on device dev. | |
1228 | */ | |
1229 | ||
8f935bbd | 1230 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1231 | { |
1232 | struct ip_mc_list *im; | |
1233 | ||
1234 | ASSERT_RTNL(); | |
1235 | ||
1d7138de | 1236 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1237 | if (im->multiaddr == addr) { |
1238 | im->users++; | |
1239 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1240 | goto out; | |
1241 | } | |
1242 | } | |
1243 | ||
1d7138de | 1244 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1245 | if (!im) |
1246 | goto out; | |
1247 | ||
a7e9ff73 JK |
1248 | im->users = 1; |
1249 | im->interface = in_dev; | |
1da177e4 | 1250 | in_dev_hold(in_dev); |
a7e9ff73 | 1251 | im->multiaddr = addr; |
1da177e4 LT |
1252 | /* initial mode is (EX, empty) */ |
1253 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1254 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1255 | atomic_set(&im->refcnt, 1); |
1256 | spin_lock_init(&im->lock); | |
1257 | #ifdef CONFIG_IP_MULTICAST | |
b24b8a24 | 1258 | setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); |
1da177e4 | 1259 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; |
1da177e4 | 1260 | #endif |
1d7138de ED |
1261 | |
1262 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1263 | in_dev->mc_count++; |
1d7138de ED |
1264 | rcu_assign_pointer(in_dev->mc_list, im); |
1265 | ||
1da177e4 LT |
1266 | #ifdef CONFIG_IP_MULTICAST |
1267 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1268 | #endif | |
1269 | igmp_group_added(im); | |
1270 | if (!in_dev->dead) | |
1271 | ip_rt_multicast_event(in_dev); | |
1272 | out: | |
1273 | return; | |
1274 | } | |
4bc2f18b | 1275 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1276 | |
a816c7c7 JV |
1277 | /* |
1278 | * Resend IGMP JOIN report; used for bonding. | |
866f3b25 | 1279 | * Called with rcu_read_lock() |
a816c7c7 | 1280 | */ |
866f3b25 | 1281 | void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1282 | { |
08882669 | 1283 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1284 | struct ip_mc_list *im; |
1285 | int type; | |
a816c7c7 | 1286 | |
866f3b25 ED |
1287 | for_each_pmc_rcu(in_dev, im) { |
1288 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1289 | continue; | |
a816c7c7 | 1290 | |
866f3b25 ED |
1291 | /* a failover is happening and switches |
1292 | * must be notified immediately | |
1293 | */ | |
1294 | if (IGMP_V1_SEEN(in_dev)) | |
1295 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1296 | else if (IGMP_V2_SEEN(in_dev)) | |
1297 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1298 | else | |
1299 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1300 | igmp_send_report(in_dev, im, type); | |
1301 | } | |
a816c7c7 JV |
1302 | #endif |
1303 | } | |
866f3b25 | 1304 | EXPORT_SYMBOL(ip_mc_rejoin_groups); |
a816c7c7 | 1305 | |
1da177e4 LT |
1306 | /* |
1307 | * A socket has left a multicast group on device dev | |
1308 | */ | |
1309 | ||
8f935bbd | 1310 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1311 | { |
1d7138de ED |
1312 | struct ip_mc_list *i; |
1313 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1314 | |
1da177e4 | 1315 | ASSERT_RTNL(); |
e905a9ed | 1316 | |
1d7138de ED |
1317 | for (ip = &in_dev->mc_list; |
1318 | (i = rtnl_dereference(*ip)) != NULL; | |
1319 | ip = &i->next_rcu) { | |
a7e9ff73 | 1320 | if (i->multiaddr == addr) { |
1da177e4 | 1321 | if (--i->users == 0) { |
1d7138de | 1322 | *ip = i->next_rcu; |
b8bae41e | 1323 | in_dev->mc_count--; |
1da177e4 LT |
1324 | igmp_group_dropped(i); |
1325 | ||
1326 | if (!in_dev->dead) | |
1327 | ip_rt_multicast_event(in_dev); | |
1328 | ||
1329 | ip_ma_put(i); | |
1330 | return; | |
1331 | } | |
1332 | break; | |
1333 | } | |
1334 | } | |
1335 | } | |
4bc2f18b | 1336 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1337 | |
75c78500 MS |
1338 | /* Device changing type */ |
1339 | ||
1340 | void ip_mc_unmap(struct in_device *in_dev) | |
1341 | { | |
1d7138de | 1342 | struct ip_mc_list *pmc; |
75c78500 MS |
1343 | |
1344 | ASSERT_RTNL(); | |
1345 | ||
1d7138de ED |
1346 | for_each_pmc_rtnl(in_dev, pmc) |
1347 | igmp_group_dropped(pmc); | |
75c78500 MS |
1348 | } |
1349 | ||
1350 | void ip_mc_remap(struct in_device *in_dev) | |
1351 | { | |
1d7138de | 1352 | struct ip_mc_list *pmc; |
75c78500 MS |
1353 | |
1354 | ASSERT_RTNL(); | |
1355 | ||
1d7138de ED |
1356 | for_each_pmc_rtnl(in_dev, pmc) |
1357 | igmp_group_added(pmc); | |
75c78500 MS |
1358 | } |
1359 | ||
1da177e4 LT |
1360 | /* Device going down */ |
1361 | ||
1362 | void ip_mc_down(struct in_device *in_dev) | |
1363 | { | |
1d7138de | 1364 | struct ip_mc_list *pmc; |
1da177e4 LT |
1365 | |
1366 | ASSERT_RTNL(); | |
1367 | ||
1d7138de ED |
1368 | for_each_pmc_rtnl(in_dev, pmc) |
1369 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1370 | |
1371 | #ifdef CONFIG_IP_MULTICAST | |
1372 | in_dev->mr_ifc_count = 0; | |
1373 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1374 | __in_dev_put(in_dev); | |
1375 | in_dev->mr_gq_running = 0; | |
1376 | if (del_timer(&in_dev->mr_gq_timer)) | |
1377 | __in_dev_put(in_dev); | |
1378 | igmpv3_clear_delrec(in_dev); | |
1379 | #endif | |
1380 | ||
1381 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1382 | } | |
1383 | ||
1384 | void ip_mc_init_dev(struct in_device *in_dev) | |
1385 | { | |
1386 | ASSERT_RTNL(); | |
1387 | ||
1388 | in_dev->mc_tomb = NULL; | |
1389 | #ifdef CONFIG_IP_MULTICAST | |
1390 | in_dev->mr_gq_running = 0; | |
b24b8a24 PE |
1391 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1392 | (unsigned long)in_dev); | |
1da177e4 | 1393 | in_dev->mr_ifc_count = 0; |
b8bae41e | 1394 | in_dev->mc_count = 0; |
b24b8a24 PE |
1395 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1396 | (unsigned long)in_dev); | |
1da177e4 LT |
1397 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; |
1398 | #endif | |
1399 | ||
1da177e4 LT |
1400 | spin_lock_init(&in_dev->mc_tomb_lock); |
1401 | } | |
1402 | ||
1403 | /* Device going up */ | |
1404 | ||
1405 | void ip_mc_up(struct in_device *in_dev) | |
1406 | { | |
1d7138de | 1407 | struct ip_mc_list *pmc; |
1da177e4 LT |
1408 | |
1409 | ASSERT_RTNL(); | |
1410 | ||
1411 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1412 | ||
1d7138de ED |
1413 | for_each_pmc_rtnl(in_dev, pmc) |
1414 | igmp_group_added(pmc); | |
1da177e4 LT |
1415 | } |
1416 | ||
1417 | /* | |
1418 | * Device is about to be destroyed: clean up. | |
1419 | */ | |
1420 | ||
1421 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1422 | { | |
1423 | struct ip_mc_list *i; | |
1424 | ||
1425 | ASSERT_RTNL(); | |
1426 | ||
1427 | /* Deactivate timers */ | |
1428 | ip_mc_down(in_dev); | |
1429 | ||
1d7138de ED |
1430 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1431 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1432 | in_dev->mc_count--; |
1d7138de | 1433 | |
1da177e4 LT |
1434 | igmp_group_dropped(i); |
1435 | ip_ma_put(i); | |
1da177e4 | 1436 | } |
1da177e4 LT |
1437 | } |
1438 | ||
9e917dca | 1439 | /* RTNL is locked */ |
877acedc | 1440 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1441 | { |
5811662b | 1442 | struct flowi fl = { .fl4_dst = imr->imr_multiaddr.s_addr }; |
1da177e4 LT |
1443 | struct rtable *rt; |
1444 | struct net_device *dev = NULL; | |
1445 | struct in_device *idev = NULL; | |
1446 | ||
1447 | if (imr->imr_ifindex) { | |
877acedc | 1448 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1449 | return idev; |
1450 | } | |
1451 | if (imr->imr_address.s_addr) { | |
9e917dca | 1452 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1453 | if (!dev) |
1454 | return NULL; | |
1da177e4 LT |
1455 | } |
1456 | ||
877acedc | 1457 | if (!dev && !ip_route_output_key(net, &rt, &fl)) { |
d8d1f30b | 1458 | dev = rt->dst.dev; |
1da177e4 LT |
1459 | ip_rt_put(rt); |
1460 | } | |
1461 | if (dev) { | |
1462 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1463 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1464 | } |
1465 | return idev; | |
1466 | } | |
1467 | ||
1468 | /* | |
1469 | * Join a socket to a group | |
1470 | */ | |
ab32ea5d BH |
1471 | int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; |
1472 | int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; | |
1da177e4 LT |
1473 | |
1474 | ||
1475 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1476 | __be32 *psfsrc) |
1da177e4 LT |
1477 | { |
1478 | struct ip_sf_list *psf, *psf_prev; | |
1479 | int rv = 0; | |
1480 | ||
1481 | psf_prev = NULL; | |
1482 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1483 | if (psf->sf_inaddr == *psfsrc) | |
1484 | break; | |
1485 | psf_prev = psf; | |
1486 | } | |
1487 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1488 | /* source filter not found, or count wrong => bug */ | |
1489 | return -ESRCH; | |
1490 | } | |
1491 | psf->sf_count[sfmode]--; | |
1492 | if (psf->sf_count[sfmode] == 0) { | |
1493 | ip_rt_multicast_event(pmc->interface); | |
1494 | } | |
1495 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1496 | #ifdef CONFIG_IP_MULTICAST | |
1497 | struct in_device *in_dev = pmc->interface; | |
1498 | #endif | |
1499 | ||
1500 | /* no more filters for this source */ | |
1501 | if (psf_prev) | |
1502 | psf_prev->sf_next = psf->sf_next; | |
1503 | else | |
1504 | pmc->sources = psf->sf_next; | |
1505 | #ifdef CONFIG_IP_MULTICAST | |
1506 | if (psf->sf_oldin && | |
1507 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
e905a9ed | 1508 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1509 | IGMP_Unsolicited_Report_Count; |
1510 | psf->sf_next = pmc->tomb; | |
1511 | pmc->tomb = psf; | |
1512 | rv = 1; | |
1513 | } else | |
1514 | #endif | |
1515 | kfree(psf); | |
1516 | } | |
1517 | return rv; | |
1518 | } | |
1519 | ||
1520 | #ifndef CONFIG_IP_MULTICAST | |
1521 | #define igmp_ifc_event(x) do { } while (0) | |
1522 | #endif | |
1523 | ||
8f935bbd AV |
1524 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1525 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1526 | { |
1527 | struct ip_mc_list *pmc; | |
1528 | int changerec = 0; | |
1529 | int i, err; | |
1530 | ||
1531 | if (!in_dev) | |
1532 | return -ENODEV; | |
1d7138de ED |
1533 | rcu_read_lock(); |
1534 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1535 | if (*pmca == pmc->multiaddr) |
1536 | break; | |
1537 | } | |
1538 | if (!pmc) { | |
1539 | /* MCA not found?? bug */ | |
1d7138de | 1540 | rcu_read_unlock(); |
1da177e4 LT |
1541 | return -ESRCH; |
1542 | } | |
1543 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1544 | rcu_read_unlock(); |
1da177e4 LT |
1545 | #ifdef CONFIG_IP_MULTICAST |
1546 | sf_markstate(pmc); | |
1547 | #endif | |
1548 | if (!delta) { | |
1549 | err = -EINVAL; | |
1550 | if (!pmc->sfcount[sfmode]) | |
1551 | goto out_unlock; | |
1552 | pmc->sfcount[sfmode]--; | |
1553 | } | |
1554 | err = 0; | |
1555 | for (i=0; i<sfcount; i++) { | |
1556 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1557 | ||
1558 | changerec |= rv > 0; | |
1559 | if (!err && rv < 0) | |
1560 | err = rv; | |
1561 | } | |
1562 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1563 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1564 | pmc->sfcount[MCAST_INCLUDE]) { | |
1565 | #ifdef CONFIG_IP_MULTICAST | |
1566 | struct ip_sf_list *psf; | |
1567 | #endif | |
1568 | ||
1569 | /* filter mode change */ | |
1570 | pmc->sfmode = MCAST_INCLUDE; | |
1571 | #ifdef CONFIG_IP_MULTICAST | |
e905a9ed | 1572 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1573 | IGMP_Unsolicited_Report_Count; |
1574 | in_dev->mr_ifc_count = pmc->crcount; | |
1575 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1576 | psf->sf_crcount = 0; | |
1577 | igmp_ifc_event(pmc->interface); | |
1578 | } else if (sf_setstate(pmc) || changerec) { | |
1579 | igmp_ifc_event(pmc->interface); | |
1580 | #endif | |
1581 | } | |
1582 | out_unlock: | |
1583 | spin_unlock_bh(&pmc->lock); | |
1584 | return err; | |
1585 | } | |
1586 | ||
1587 | /* | |
1588 | * Add multicast single-source filter to the interface list | |
1589 | */ | |
1590 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1591 | __be32 *psfsrc, int delta) |
1da177e4 LT |
1592 | { |
1593 | struct ip_sf_list *psf, *psf_prev; | |
1594 | ||
1595 | psf_prev = NULL; | |
1596 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1597 | if (psf->sf_inaddr == *psfsrc) | |
1598 | break; | |
1599 | psf_prev = psf; | |
1600 | } | |
1601 | if (!psf) { | |
0da974f4 | 1602 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1603 | if (!psf) |
1604 | return -ENOBUFS; | |
1da177e4 LT |
1605 | psf->sf_inaddr = *psfsrc; |
1606 | if (psf_prev) { | |
1607 | psf_prev->sf_next = psf; | |
1608 | } else | |
1609 | pmc->sources = psf; | |
1610 | } | |
1611 | psf->sf_count[sfmode]++; | |
1612 | if (psf->sf_count[sfmode] == 1) { | |
1613 | ip_rt_multicast_event(pmc->interface); | |
1614 | } | |
1615 | return 0; | |
1616 | } | |
1617 | ||
1618 | #ifdef CONFIG_IP_MULTICAST | |
1619 | static void sf_markstate(struct ip_mc_list *pmc) | |
1620 | { | |
1621 | struct ip_sf_list *psf; | |
1622 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1623 | ||
1624 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1625 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1626 | psf->sf_oldin = mca_xcount == | |
1627 | psf->sf_count[MCAST_EXCLUDE] && | |
1628 | !psf->sf_count[MCAST_INCLUDE]; | |
1629 | } else | |
1630 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1631 | } | |
1632 | ||
1633 | static int sf_setstate(struct ip_mc_list *pmc) | |
1634 | { | |
ad12583f | 1635 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1636 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1637 | int qrv = pmc->interface->mr_qrv; | |
1638 | int new_in, rv; | |
1639 | ||
1640 | rv = 0; | |
1641 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1642 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1643 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1644 | !psf->sf_count[MCAST_INCLUDE]; | |
1645 | } else | |
1646 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1647 | if (new_in) { |
1648 | if (!psf->sf_oldin) { | |
76edc605 | 1649 | struct ip_sf_list *prev = NULL; |
ad12583f DS |
1650 | |
1651 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { | |
1652 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1653 | break; | |
1654 | prev = dpsf; | |
1655 | } | |
1656 | if (dpsf) { | |
1657 | if (prev) | |
1658 | prev->sf_next = dpsf->sf_next; | |
1659 | else | |
1660 | pmc->tomb = dpsf->sf_next; | |
1661 | kfree(dpsf); | |
1662 | } | |
1663 | psf->sf_crcount = qrv; | |
1664 | rv++; | |
1665 | } | |
1666 | } else if (psf->sf_oldin) { | |
1667 | ||
1668 | psf->sf_crcount = 0; | |
1669 | /* | |
1670 | * add or update "delete" records if an active filter | |
1671 | * is now inactive | |
1672 | */ | |
1673 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) | |
1674 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1675 | break; | |
1676 | if (!dpsf) { | |
3ed37a6f | 1677 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1678 | if (!dpsf) |
1679 | continue; | |
1680 | *dpsf = *psf; | |
1681 | /* pmc->lock held by callers */ | |
1682 | dpsf->sf_next = pmc->tomb; | |
1683 | pmc->tomb = dpsf; | |
1684 | } | |
1685 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1686 | rv++; |
1687 | } | |
1688 | } | |
1689 | return rv; | |
1690 | } | |
1691 | #endif | |
1692 | ||
1693 | /* | |
1694 | * Add multicast source filter list to the interface list | |
1695 | */ | |
8f935bbd AV |
1696 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1697 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1698 | { |
1699 | struct ip_mc_list *pmc; | |
1700 | int isexclude; | |
1701 | int i, err; | |
1702 | ||
1703 | if (!in_dev) | |
1704 | return -ENODEV; | |
1d7138de ED |
1705 | rcu_read_lock(); |
1706 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1707 | if (*pmca == pmc->multiaddr) |
1708 | break; | |
1709 | } | |
1710 | if (!pmc) { | |
1711 | /* MCA not found?? bug */ | |
1d7138de | 1712 | rcu_read_unlock(); |
1da177e4 LT |
1713 | return -ESRCH; |
1714 | } | |
1715 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1716 | rcu_read_unlock(); |
1da177e4 LT |
1717 | |
1718 | #ifdef CONFIG_IP_MULTICAST | |
1719 | sf_markstate(pmc); | |
1720 | #endif | |
1721 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1722 | if (!delta) | |
1723 | pmc->sfcount[sfmode]++; | |
1724 | err = 0; | |
1725 | for (i=0; i<sfcount; i++) { | |
1726 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); | |
1727 | if (err) | |
1728 | break; | |
1729 | } | |
1730 | if (err) { | |
1731 | int j; | |
1732 | ||
1733 | pmc->sfcount[sfmode]--; | |
1734 | for (j=0; j<i; j++) | |
1735 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1736 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { | |
1737 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 1738 | struct ip_sf_list *psf; |
cfcabdcc | 1739 | in_dev = pmc->interface; |
1da177e4 LT |
1740 | #endif |
1741 | ||
1742 | /* filter mode change */ | |
1743 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1744 | pmc->sfmode = MCAST_EXCLUDE; | |
1745 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1746 | pmc->sfmode = MCAST_INCLUDE; | |
1747 | #ifdef CONFIG_IP_MULTICAST | |
1748 | /* else no filters; keep old mode for reports */ | |
1749 | ||
e905a9ed | 1750 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1751 | IGMP_Unsolicited_Report_Count; |
1752 | in_dev->mr_ifc_count = pmc->crcount; | |
1753 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1754 | psf->sf_crcount = 0; | |
1755 | igmp_ifc_event(in_dev); | |
1756 | } else if (sf_setstate(pmc)) { | |
1757 | igmp_ifc_event(in_dev); | |
1758 | #endif | |
1759 | } | |
1760 | spin_unlock_bh(&pmc->lock); | |
1761 | return err; | |
1762 | } | |
1763 | ||
1764 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1765 | { | |
1766 | struct ip_sf_list *psf, *nextpsf; | |
1767 | ||
1768 | for (psf=pmc->tomb; psf; psf=nextpsf) { | |
1769 | nextpsf = psf->sf_next; | |
1770 | kfree(psf); | |
1771 | } | |
1772 | pmc->tomb = NULL; | |
1773 | for (psf=pmc->sources; psf; psf=nextpsf) { | |
1774 | nextpsf = psf->sf_next; | |
1775 | kfree(psf); | |
1776 | } | |
1777 | pmc->sources = NULL; | |
1778 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1779 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1780 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1781 | } | |
1782 | ||
1783 | ||
1784 | /* | |
1785 | * Join a multicast group | |
1786 | */ | |
1787 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1788 | { | |
1789 | int err; | |
8f935bbd | 1790 | __be32 addr = imr->imr_multiaddr.s_addr; |
a7e9ff73 | 1791 | struct ip_mc_socklist *iml = NULL, *i; |
1da177e4 LT |
1792 | struct in_device *in_dev; |
1793 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 1794 | struct net *net = sock_net(sk); |
ca9b907d | 1795 | int ifindex; |
1da177e4 LT |
1796 | int count = 0; |
1797 | ||
f97c1e0c | 1798 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1799 | return -EINVAL; |
1800 | ||
6756ae4b | 1801 | rtnl_lock(); |
1da177e4 | 1802 | |
877acedc | 1803 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
1804 | |
1805 | if (!in_dev) { | |
1806 | iml = NULL; | |
1807 | err = -ENODEV; | |
1808 | goto done; | |
1809 | } | |
1810 | ||
1da177e4 | 1811 | err = -EADDRINUSE; |
ca9b907d | 1812 | ifindex = imr->imr_ifindex; |
1d7138de | 1813 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
1814 | if (i->multi.imr_multiaddr.s_addr == addr && |
1815 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1816 | goto done; |
1da177e4 LT |
1817 | count++; |
1818 | } | |
1819 | err = -ENOBUFS; | |
ca9b907d DS |
1820 | if (count >= sysctl_igmp_max_memberships) |
1821 | goto done; | |
a7e9ff73 | 1822 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
ca9b907d | 1823 | if (iml == NULL) |
1da177e4 | 1824 | goto done; |
ca9b907d | 1825 | |
1da177e4 | 1826 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 1827 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
1828 | iml->sflist = NULL; |
1829 | iml->sfmode = MCAST_EXCLUDE; | |
c85bb41e | 1830 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 1831 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 1832 | err = 0; |
1da177e4 | 1833 | done: |
6756ae4b | 1834 | rtnl_unlock(); |
1da177e4 LT |
1835 | return err; |
1836 | } | |
4bc2f18b | 1837 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 | 1838 | |
c85bb41e FL |
1839 | static void ip_sf_socklist_reclaim(struct rcu_head *rp) |
1840 | { | |
1d7138de | 1841 | kfree(container_of(rp, struct ip_sf_socklist, rcu)); |
c85bb41e | 1842 | /* sk_omem_alloc should have been decreased by the caller*/ |
c85bb41e FL |
1843 | } |
1844 | ||
1da177e4 LT |
1845 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, |
1846 | struct in_device *in_dev) | |
1847 | { | |
1d7138de | 1848 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
1849 | int err; |
1850 | ||
c85bb41e | 1851 | if (psf == NULL) { |
1da177e4 LT |
1852 | /* any-source empty exclude case */ |
1853 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1854 | iml->sfmode, 0, NULL, 0); | |
1855 | } | |
1856 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e FL |
1857 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
1858 | rcu_assign_pointer(iml->sflist, NULL); | |
1859 | /* decrease mem now to avoid the memleak warning */ | |
1860 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
1861 | call_rcu(&psf->rcu, ip_sf_socklist_reclaim); | |
1da177e4 LT |
1862 | return err; |
1863 | } | |
1864 | ||
c85bb41e FL |
1865 | |
1866 | static void ip_mc_socklist_reclaim(struct rcu_head *rp) | |
1867 | { | |
1d7138de | 1868 | kfree(container_of(rp, struct ip_mc_socklist, rcu)); |
c85bb41e | 1869 | /* sk_omem_alloc should have been decreased by the caller*/ |
c85bb41e FL |
1870 | } |
1871 | ||
1872 | ||
1da177e4 LT |
1873 | /* |
1874 | * Ask a socket to leave a group. | |
1875 | */ | |
1876 | ||
1877 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1878 | { | |
1879 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
1880 | struct ip_mc_socklist *iml; |
1881 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 1882 | struct in_device *in_dev; |
877acedc | 1883 | struct net *net = sock_net(sk); |
8f935bbd | 1884 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 1885 | u32 ifindex; |
acd6e00b | 1886 | int ret = -EADDRNOTAVAIL; |
1da177e4 LT |
1887 | |
1888 | rtnl_lock(); | |
877acedc | 1889 | in_dev = ip_mc_find_dev(net, imr); |
84b42bae | 1890 | ifindex = imr->imr_ifindex; |
1d7138de ED |
1891 | for (imlp = &inet->mc_list; |
1892 | (iml = rtnl_dereference(*imlp)) != NULL; | |
1893 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
1894 | if (iml->multi.imr_multiaddr.s_addr != group) |
1895 | continue; | |
1896 | if (ifindex) { | |
1897 | if (iml->multi.imr_ifindex != ifindex) | |
1898 | continue; | |
1899 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
1900 | iml->multi.imr_address.s_addr) | |
1901 | continue; | |
1da177e4 | 1902 | |
acd6e00b | 1903 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 1904 | |
1d7138de | 1905 | *imlp = iml->next_rcu; |
acd6e00b DS |
1906 | |
1907 | if (in_dev) | |
84b42bae | 1908 | ip_mc_dec_group(in_dev, group); |
acd6e00b | 1909 | rtnl_unlock(); |
c85bb41e FL |
1910 | /* decrease mem now to avoid the memleak warning */ |
1911 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
1912 | call_rcu(&iml->rcu, ip_mc_socklist_reclaim); | |
acd6e00b | 1913 | return 0; |
1da177e4 | 1914 | } |
acd6e00b DS |
1915 | if (!in_dev) |
1916 | ret = -ENODEV; | |
1da177e4 | 1917 | rtnl_unlock(); |
acd6e00b | 1918 | return ret; |
1da177e4 LT |
1919 | } |
1920 | ||
1921 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1922 | ip_mreq_source *mreqs, int ifindex) | |
1923 | { | |
1924 | int err; | |
1925 | struct ip_mreqn imr; | |
63007727 | 1926 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
1927 | struct ip_mc_socklist *pmc; |
1928 | struct in_device *in_dev = NULL; | |
1929 | struct inet_sock *inet = inet_sk(sk); | |
1930 | struct ip_sf_socklist *psl; | |
877acedc | 1931 | struct net *net = sock_net(sk); |
8cdaaa15 | 1932 | int leavegroup = 0; |
1da177e4 LT |
1933 | int i, j, rv; |
1934 | ||
f97c1e0c | 1935 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1936 | return -EINVAL; |
1937 | ||
6756ae4b | 1938 | rtnl_lock(); |
1da177e4 LT |
1939 | |
1940 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1941 | imr.imr_address.s_addr = mreqs->imr_interface; | |
1942 | imr.imr_ifindex = ifindex; | |
877acedc | 1943 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
1944 | |
1945 | if (!in_dev) { | |
1946 | err = -ENODEV; | |
1947 | goto done; | |
1948 | } | |
1949 | err = -EADDRNOTAVAIL; | |
1950 | ||
1d7138de | 1951 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
1952 | if ((pmc->multi.imr_multiaddr.s_addr == |
1953 | imr.imr_multiaddr.s_addr) && | |
1954 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
1955 | break; |
1956 | } | |
917f2f10 DS |
1957 | if (!pmc) { /* must have a prior join */ |
1958 | err = -EINVAL; | |
1da177e4 | 1959 | goto done; |
917f2f10 | 1960 | } |
1da177e4 LT |
1961 | /* if a source filter was set, must be the same mode as before */ |
1962 | if (pmc->sflist) { | |
917f2f10 DS |
1963 | if (pmc->sfmode != omode) { |
1964 | err = -EINVAL; | |
1da177e4 | 1965 | goto done; |
917f2f10 | 1966 | } |
1da177e4 LT |
1967 | } else if (pmc->sfmode != omode) { |
1968 | /* allow mode switches for empty-set filters */ | |
1969 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 1970 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
1971 | NULL, 0); |
1972 | pmc->sfmode = omode; | |
1973 | } | |
1974 | ||
1d7138de | 1975 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
1976 | if (!add) { |
1977 | if (!psl) | |
917f2f10 | 1978 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 LT |
1979 | rv = !0; |
1980 | for (i=0; i<psl->sl_count; i++) { | |
1981 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 1982 | sizeof(__be32)); |
1da177e4 LT |
1983 | if (rv == 0) |
1984 | break; | |
1985 | } | |
1986 | if (rv) /* source not found */ | |
917f2f10 | 1987 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 1988 | |
8cdaaa15 DS |
1989 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1990 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
1991 | leavegroup = 1; | |
1992 | goto done; | |
1993 | } | |
1994 | ||
1da177e4 | 1995 | /* update the interface filter */ |
e905a9ed | 1996 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
1997 | &mreqs->imr_sourceaddr, 1); |
1998 | ||
1999 | for (j=i+1; j<psl->sl_count; j++) | |
2000 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
2001 | psl->sl_count--; | |
2002 | err = 0; | |
2003 | goto done; | |
2004 | } | |
2005 | /* else, add a new source to the filter */ | |
2006 | ||
2007 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
2008 | err = -ENOBUFS; | |
2009 | goto done; | |
2010 | } | |
2011 | if (!psl || psl->sl_count == psl->sl_max) { | |
2012 | struct ip_sf_socklist *newpsl; | |
2013 | int count = IP_SFBLOCK; | |
2014 | ||
2015 | if (psl) | |
2016 | count += psl->sl_max; | |
8b3a7005 | 2017 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2018 | if (!newpsl) { |
2019 | err = -ENOBUFS; | |
2020 | goto done; | |
2021 | } | |
2022 | newpsl->sl_max = count; | |
2023 | newpsl->sl_count = count - IP_SFBLOCK; | |
2024 | if (psl) { | |
2025 | for (i=0; i<psl->sl_count; i++) | |
2026 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
c85bb41e FL |
2027 | /* decrease mem now to avoid the memleak warning */ |
2028 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
2029 | call_rcu(&psl->rcu, ip_sf_socklist_reclaim); | |
1da177e4 | 2030 | } |
c85bb41e FL |
2031 | rcu_assign_pointer(pmc->sflist, newpsl); |
2032 | psl = newpsl; | |
1da177e4 LT |
2033 | } |
2034 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
2035 | for (i=0; i<psl->sl_count; i++) { | |
2036 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 2037 | sizeof(__be32)); |
1da177e4 LT |
2038 | if (rv == 0) |
2039 | break; | |
2040 | } | |
2041 | if (rv == 0) /* address already there is an error */ | |
2042 | goto done; | |
2043 | for (j=psl->sl_count-1; j>=i; j--) | |
2044 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
2045 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2046 | psl->sl_count++; | |
2047 | err = 0; | |
2048 | /* update the interface list */ | |
e905a9ed | 2049 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2050 | &mreqs->imr_sourceaddr, 1); |
2051 | done: | |
6756ae4b | 2052 | rtnl_unlock(); |
8cdaaa15 DS |
2053 | if (leavegroup) |
2054 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2055 | return err; |
2056 | } | |
2057 | ||
2058 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2059 | { | |
9951f036 | 2060 | int err = 0; |
1da177e4 | 2061 | struct ip_mreqn imr; |
63007727 | 2062 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2063 | struct ip_mc_socklist *pmc; |
2064 | struct in_device *in_dev; | |
2065 | struct inet_sock *inet = inet_sk(sk); | |
2066 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2067 | struct net *net = sock_net(sk); |
9951f036 | 2068 | int leavegroup = 0; |
1da177e4 | 2069 | |
f97c1e0c | 2070 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2071 | return -EINVAL; |
2072 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2073 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2074 | return -EINVAL; | |
2075 | ||
6756ae4b | 2076 | rtnl_lock(); |
1da177e4 LT |
2077 | |
2078 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2079 | imr.imr_address.s_addr = msf->imsf_interface; | |
2080 | imr.imr_ifindex = ifindex; | |
877acedc | 2081 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2082 | |
2083 | if (!in_dev) { | |
2084 | err = -ENODEV; | |
2085 | goto done; | |
2086 | } | |
1da177e4 | 2087 | |
9951f036 DS |
2088 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2089 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2090 | leavegroup = 1; | |
2091 | goto done; | |
2092 | } | |
2093 | ||
1d7138de | 2094 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2095 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2096 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2097 | break; | |
2098 | } | |
917f2f10 DS |
2099 | if (!pmc) { /* must have a prior join */ |
2100 | err = -EINVAL; | |
1da177e4 | 2101 | goto done; |
917f2f10 | 2102 | } |
1da177e4 | 2103 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2104 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2105 | GFP_KERNEL); | |
1da177e4 LT |
2106 | if (!newpsl) { |
2107 | err = -ENOBUFS; | |
2108 | goto done; | |
2109 | } | |
2110 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2111 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2112 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2113 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2114 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2115 | if (err) { | |
2116 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2117 | goto done; | |
2118 | } | |
8713dbf0 | 2119 | } else { |
1da177e4 | 2120 | newpsl = NULL; |
8713dbf0 YZ |
2121 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2122 | msf->imsf_fmode, 0, NULL, 0); | |
2123 | } | |
1d7138de | 2124 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2125 | if (psl) { |
2126 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2127 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2128 | /* decrease mem now to avoid the memleak warning */ |
2129 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
2130 | call_rcu(&psl->rcu, ip_sf_socklist_reclaim); | |
1da177e4 LT |
2131 | } else |
2132 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2133 | 0, NULL, 0); | |
c85bb41e | 2134 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2135 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2136 | err = 0; |
1da177e4 | 2137 | done: |
6756ae4b | 2138 | rtnl_unlock(); |
9951f036 DS |
2139 | if (leavegroup) |
2140 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2141 | return err; |
2142 | } | |
2143 | ||
2144 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2145 | struct ip_msfilter __user *optval, int __user *optlen) | |
2146 | { | |
2147 | int err, len, count, copycount; | |
2148 | struct ip_mreqn imr; | |
63007727 | 2149 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2150 | struct ip_mc_socklist *pmc; |
2151 | struct in_device *in_dev; | |
2152 | struct inet_sock *inet = inet_sk(sk); | |
2153 | struct ip_sf_socklist *psl; | |
877acedc | 2154 | struct net *net = sock_net(sk); |
1da177e4 | 2155 | |
f97c1e0c | 2156 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2157 | return -EINVAL; |
2158 | ||
6756ae4b | 2159 | rtnl_lock(); |
1da177e4 LT |
2160 | |
2161 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2162 | imr.imr_address.s_addr = msf->imsf_interface; | |
2163 | imr.imr_ifindex = 0; | |
877acedc | 2164 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2165 | |
2166 | if (!in_dev) { | |
2167 | err = -ENODEV; | |
2168 | goto done; | |
2169 | } | |
2170 | err = -EADDRNOTAVAIL; | |
2171 | ||
1d7138de | 2172 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2173 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2174 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2175 | break; | |
2176 | } | |
2177 | if (!pmc) /* must have a prior join */ | |
2178 | goto done; | |
2179 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2180 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2181 | rtnl_unlock(); |
1da177e4 LT |
2182 | if (!psl) { |
2183 | len = 0; | |
2184 | count = 0; | |
2185 | } else { | |
2186 | count = psl->sl_count; | |
2187 | } | |
2188 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2189 | len = copycount * sizeof(psl->sl_addr[0]); | |
2190 | msf->imsf_numsrc = count; | |
2191 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2192 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2193 | return -EFAULT; | |
2194 | } | |
2195 | if (len && | |
2196 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2197 | return -EFAULT; | |
2198 | return 0; | |
2199 | done: | |
6756ae4b | 2200 | rtnl_unlock(); |
1da177e4 LT |
2201 | return err; |
2202 | } | |
2203 | ||
2204 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2205 | struct group_filter __user *optval, int __user *optlen) | |
2206 | { | |
2207 | int err, i, count, copycount; | |
2208 | struct sockaddr_in *psin; | |
63007727 | 2209 | __be32 addr; |
1da177e4 LT |
2210 | struct ip_mc_socklist *pmc; |
2211 | struct inet_sock *inet = inet_sk(sk); | |
2212 | struct ip_sf_socklist *psl; | |
2213 | ||
2214 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2215 | if (psin->sin_family != AF_INET) | |
2216 | return -EINVAL; | |
2217 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2218 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2219 | return -EINVAL; |
2220 | ||
6756ae4b | 2221 | rtnl_lock(); |
1da177e4 LT |
2222 | |
2223 | err = -EADDRNOTAVAIL; | |
2224 | ||
1d7138de | 2225 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2226 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2227 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2228 | break; | |
2229 | } | |
2230 | if (!pmc) /* must have a prior join */ | |
2231 | goto done; | |
2232 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2233 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2234 | rtnl_unlock(); |
1da177e4 LT |
2235 | count = psl ? psl->sl_count : 0; |
2236 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2237 | gsf->gf_numsrc = count; | |
2238 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2239 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2240 | return -EFAULT; | |
2241 | } | |
2242 | for (i=0; i<copycount; i++) { | |
1da177e4 LT |
2243 | struct sockaddr_storage ss; |
2244 | ||
2245 | psin = (struct sockaddr_in *)&ss; | |
2246 | memset(&ss, 0, sizeof(ss)); | |
2247 | psin->sin_family = AF_INET; | |
2248 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2249 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2250 | return -EFAULT; | |
2251 | } | |
2252 | return 0; | |
2253 | done: | |
6756ae4b | 2254 | rtnl_unlock(); |
1da177e4 LT |
2255 | return err; |
2256 | } | |
2257 | ||
2258 | /* | |
2259 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2260 | */ | |
c0cda068 | 2261 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2262 | { |
2263 | struct inet_sock *inet = inet_sk(sk); | |
2264 | struct ip_mc_socklist *pmc; | |
2265 | struct ip_sf_socklist *psl; | |
2266 | int i; | |
c85bb41e | 2267 | int ret; |
1da177e4 | 2268 | |
c85bb41e | 2269 | ret = 1; |
f97c1e0c | 2270 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2271 | goto out; |
1da177e4 | 2272 | |
c85bb41e | 2273 | rcu_read_lock(); |
1d7138de | 2274 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2275 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2276 | pmc->multi.imr_ifindex == dif) | |
2277 | break; | |
2278 | } | |
c85bb41e | 2279 | ret = inet->mc_all; |
1da177e4 | 2280 | if (!pmc) |
c85bb41e | 2281 | goto unlock; |
1d7138de | 2282 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2283 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2284 | if (!psl) |
c85bb41e | 2285 | goto unlock; |
1da177e4 LT |
2286 | |
2287 | for (i=0; i<psl->sl_count; i++) { | |
2288 | if (psl->sl_addr[i] == rmt_addr) | |
2289 | break; | |
2290 | } | |
c85bb41e | 2291 | ret = 0; |
1da177e4 | 2292 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2293 | goto unlock; |
1da177e4 | 2294 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2295 | goto unlock; |
2296 | ret = 1; | |
2297 | unlock: | |
2298 | rcu_read_unlock(); | |
2299 | out: | |
2300 | return ret; | |
1da177e4 LT |
2301 | } |
2302 | ||
2303 | /* | |
2304 | * A socket is closing. | |
2305 | */ | |
2306 | ||
2307 | void ip_mc_drop_socket(struct sock *sk) | |
2308 | { | |
2309 | struct inet_sock *inet = inet_sk(sk); | |
2310 | struct ip_mc_socklist *iml; | |
877acedc | 2311 | struct net *net = sock_net(sk); |
1da177e4 LT |
2312 | |
2313 | if (inet->mc_list == NULL) | |
2314 | return; | |
2315 | ||
2316 | rtnl_lock(); | |
1d7138de | 2317 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2318 | struct in_device *in_dev; |
1da177e4 | 2319 | |
1d7138de | 2320 | inet->mc_list = iml->next_rcu; |
877acedc | 2321 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2322 | (void) ip_mc_leave_src(sk, iml, in_dev); |
18943d29 | 2323 | if (in_dev != NULL) |
1da177e4 | 2324 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2325 | /* decrease mem now to avoid the memleak warning */ |
2326 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
2327 | call_rcu(&iml->rcu, ip_mc_socklist_reclaim); | |
1da177e4 LT |
2328 | } |
2329 | rtnl_unlock(); | |
2330 | } | |
2331 | ||
a60c4923 | 2332 | int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) |
1da177e4 LT |
2333 | { |
2334 | struct ip_mc_list *im; | |
2335 | struct ip_sf_list *psf; | |
2336 | int rv = 0; | |
2337 | ||
1d7138de ED |
2338 | rcu_read_lock(); |
2339 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
2340 | if (im->multiaddr == mc_addr) |
2341 | break; | |
2342 | } | |
2343 | if (im && proto == IPPROTO_IGMP) { | |
2344 | rv = 1; | |
2345 | } else if (im) { | |
2346 | if (src_addr) { | |
2347 | for (psf=im->sources; psf; psf=psf->sf_next) { | |
2348 | if (psf->sf_inaddr == src_addr) | |
2349 | break; | |
2350 | } | |
2351 | if (psf) | |
2352 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2353 | psf->sf_count[MCAST_EXCLUDE] != | |
2354 | im->sfcount[MCAST_EXCLUDE]; | |
2355 | else | |
2356 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2357 | } else | |
2358 | rv = 1; /* unspecified source; tentatively allow */ | |
2359 | } | |
1d7138de | 2360 | rcu_read_unlock(); |
1da177e4 LT |
2361 | return rv; |
2362 | } | |
2363 | ||
2364 | #if defined(CONFIG_PROC_FS) | |
2365 | struct igmp_mc_iter_state { | |
7091e728 | 2366 | struct seq_net_private p; |
1da177e4 LT |
2367 | struct net_device *dev; |
2368 | struct in_device *in_dev; | |
2369 | }; | |
2370 | ||
2371 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2372 | ||
2373 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2374 | { | |
7091e728 | 2375 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2376 | struct ip_mc_list *im = NULL; |
2377 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2378 | ||
7562f876 | 2379 | state->in_dev = NULL; |
61fbab77 | 2380 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2381 | struct in_device *in_dev; |
6baff150 ED |
2382 | |
2383 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2384 | if (!in_dev) |
2385 | continue; | |
1d7138de | 2386 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2387 | if (im) { |
2388 | state->in_dev = in_dev; | |
2389 | break; | |
2390 | } | |
1da177e4 LT |
2391 | } |
2392 | return im; | |
2393 | } | |
2394 | ||
2395 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2396 | { | |
2397 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2398 | |
1d7138de ED |
2399 | im = rcu_dereference(im->next_rcu); |
2400 | while (!im) { | |
6baff150 | 2401 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2402 | if (!state->dev) { |
2403 | state->in_dev = NULL; | |
2404 | break; | |
2405 | } | |
6baff150 | 2406 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2407 | if (!state->in_dev) |
2408 | continue; | |
1d7138de | 2409 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2410 | } |
2411 | return im; | |
2412 | } | |
2413 | ||
2414 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2415 | { | |
2416 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2417 | if (im) | |
2418 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2419 | --pos; | |
2420 | return pos ? NULL : im; | |
2421 | } | |
2422 | ||
2423 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2424 | __acquires(rcu) |
1da177e4 | 2425 | { |
61fbab77 | 2426 | rcu_read_lock(); |
1da177e4 LT |
2427 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2428 | } | |
2429 | ||
2430 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2431 | { | |
2432 | struct ip_mc_list *im; | |
2433 | if (v == SEQ_START_TOKEN) | |
2434 | im = igmp_mc_get_first(seq); | |
2435 | else | |
2436 | im = igmp_mc_get_next(seq, v); | |
2437 | ++*pos; | |
2438 | return im; | |
2439 | } | |
2440 | ||
2441 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2442 | __releases(rcu) |
1da177e4 LT |
2443 | { |
2444 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2445 | |
2446 | state->in_dev = NULL; | |
1da177e4 | 2447 | state->dev = NULL; |
61fbab77 | 2448 | rcu_read_unlock(); |
1da177e4 LT |
2449 | } |
2450 | ||
2451 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2452 | { | |
2453 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2454 | seq_puts(seq, |
1da177e4 LT |
2455 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2456 | else { | |
2457 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2458 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2459 | char *querier; | |
2460 | #ifdef CONFIG_IP_MULTICAST | |
2461 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2462 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2463 | "V3"; | |
2464 | #else | |
2465 | querier = "NONE"; | |
2466 | #endif | |
2467 | ||
1d7138de | 2468 | if (rcu_dereference(state->in_dev->mc_list) == im) { |
1da177e4 | 2469 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2470 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2471 | } |
2472 | ||
2473 | seq_printf(seq, | |
338fcf98 | 2474 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 LT |
2475 | im->multiaddr, im->users, |
2476 | im->tm_running, im->tm_running ? | |
2477 | jiffies_to_clock_t(im->timer.expires-jiffies) : 0, | |
2478 | im->reporter); | |
2479 | } | |
2480 | return 0; | |
2481 | } | |
2482 | ||
f690808e | 2483 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2484 | .start = igmp_mc_seq_start, |
2485 | .next = igmp_mc_seq_next, | |
2486 | .stop = igmp_mc_seq_stop, | |
2487 | .show = igmp_mc_seq_show, | |
2488 | }; | |
2489 | ||
2490 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2491 | { | |
7091e728 | 2492 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2493 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2494 | } |
2495 | ||
9a32144e | 2496 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2497 | .owner = THIS_MODULE, |
2498 | .open = igmp_mc_seq_open, | |
2499 | .read = seq_read, | |
2500 | .llseek = seq_lseek, | |
7091e728 | 2501 | .release = seq_release_net, |
1da177e4 LT |
2502 | }; |
2503 | ||
2504 | struct igmp_mcf_iter_state { | |
7091e728 | 2505 | struct seq_net_private p; |
1da177e4 LT |
2506 | struct net_device *dev; |
2507 | struct in_device *idev; | |
2508 | struct ip_mc_list *im; | |
2509 | }; | |
2510 | ||
2511 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2512 | ||
2513 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2514 | { | |
7091e728 | 2515 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2516 | struct ip_sf_list *psf = NULL; |
2517 | struct ip_mc_list *im = NULL; | |
2518 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2519 | ||
7562f876 PE |
2520 | state->idev = NULL; |
2521 | state->im = NULL; | |
61fbab77 | 2522 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2523 | struct in_device *idev; |
6baff150 | 2524 | idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2525 | if (unlikely(idev == NULL)) |
2526 | continue; | |
1d7138de | 2527 | im = rcu_dereference(idev->mc_list); |
1da177e4 LT |
2528 | if (likely(im != NULL)) { |
2529 | spin_lock_bh(&im->lock); | |
2530 | psf = im->sources; | |
2531 | if (likely(psf != NULL)) { | |
2532 | state->im = im; | |
2533 | state->idev = idev; | |
2534 | break; | |
2535 | } | |
2536 | spin_unlock_bh(&im->lock); | |
2537 | } | |
1da177e4 LT |
2538 | } |
2539 | return psf; | |
2540 | } | |
2541 | ||
2542 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2543 | { | |
2544 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2545 | ||
2546 | psf = psf->sf_next; | |
2547 | while (!psf) { | |
2548 | spin_unlock_bh(&state->im->lock); | |
2549 | state->im = state->im->next; | |
2550 | while (!state->im) { | |
6baff150 | 2551 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2552 | if (!state->dev) { |
2553 | state->idev = NULL; | |
2554 | goto out; | |
2555 | } | |
6baff150 | 2556 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2557 | if (!state->idev) |
2558 | continue; | |
1d7138de | 2559 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2560 | } |
2561 | if (!state->im) | |
2562 | break; | |
2563 | spin_lock_bh(&state->im->lock); | |
2564 | psf = state->im->sources; | |
2565 | } | |
2566 | out: | |
2567 | return psf; | |
2568 | } | |
2569 | ||
2570 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2571 | { | |
2572 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2573 | if (psf) | |
2574 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2575 | --pos; | |
2576 | return pos ? NULL : psf; | |
2577 | } | |
2578 | ||
2579 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2580 | __acquires(rcu) |
1da177e4 | 2581 | { |
61fbab77 | 2582 | rcu_read_lock(); |
1da177e4 LT |
2583 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2584 | } | |
2585 | ||
2586 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2587 | { | |
2588 | struct ip_sf_list *psf; | |
2589 | if (v == SEQ_START_TOKEN) | |
2590 | psf = igmp_mcf_get_first(seq); | |
2591 | else | |
2592 | psf = igmp_mcf_get_next(seq, v); | |
2593 | ++*pos; | |
2594 | return psf; | |
2595 | } | |
2596 | ||
2597 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2598 | __releases(rcu) |
1da177e4 LT |
2599 | { |
2600 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2601 | if (likely(state->im != NULL)) { | |
2602 | spin_unlock_bh(&state->im->lock); | |
2603 | state->im = NULL; | |
2604 | } | |
1d7138de | 2605 | state->idev = NULL; |
1da177e4 | 2606 | state->dev = NULL; |
61fbab77 | 2607 | rcu_read_unlock(); |
1da177e4 LT |
2608 | } |
2609 | ||
2610 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2611 | { | |
2612 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2613 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2614 | ||
2615 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2616 | seq_printf(seq, |
1da177e4 LT |
2617 | "%3s %6s " |
2618 | "%10s %10s %6s %6s\n", "Idx", | |
2619 | "Device", "MCA", | |
2620 | "SRC", "INC", "EXC"); | |
2621 | } else { | |
2622 | seq_printf(seq, | |
2623 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2624 | "0x%08x %6lu %6lu\n", |
2625 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2626 | ntohl(state->im->multiaddr), |
2627 | ntohl(psf->sf_inaddr), | |
2628 | psf->sf_count[MCAST_INCLUDE], | |
2629 | psf->sf_count[MCAST_EXCLUDE]); | |
2630 | } | |
2631 | return 0; | |
2632 | } | |
2633 | ||
f690808e | 2634 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2635 | .start = igmp_mcf_seq_start, |
2636 | .next = igmp_mcf_seq_next, | |
2637 | .stop = igmp_mcf_seq_stop, | |
2638 | .show = igmp_mcf_seq_show, | |
2639 | }; | |
2640 | ||
2641 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2642 | { | |
7091e728 | 2643 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2644 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2645 | } |
2646 | ||
9a32144e | 2647 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2648 | .owner = THIS_MODULE, |
2649 | .open = igmp_mcf_seq_open, | |
2650 | .read = seq_read, | |
2651 | .llseek = seq_lseek, | |
7091e728 | 2652 | .release = seq_release_net, |
1da177e4 LT |
2653 | }; |
2654 | ||
2c8c1e72 | 2655 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2656 | { |
7091e728 AD |
2657 | struct proc_dir_entry *pde; |
2658 | ||
2659 | pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); | |
2660 | if (!pde) | |
2661 | goto out_igmp; | |
2662 | pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); | |
2663 | if (!pde) | |
2664 | goto out_mcfilter; | |
1da177e4 | 2665 | return 0; |
7091e728 AD |
2666 | |
2667 | out_mcfilter: | |
2668 | proc_net_remove(net, "igmp"); | |
2669 | out_igmp: | |
2670 | return -ENOMEM; | |
2671 | } | |
2672 | ||
2c8c1e72 | 2673 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 AD |
2674 | { |
2675 | proc_net_remove(net, "mcfilter"); | |
2676 | proc_net_remove(net, "igmp"); | |
2677 | } | |
2678 | ||
2679 | static struct pernet_operations igmp_net_ops = { | |
2680 | .init = igmp_net_init, | |
2681 | .exit = igmp_net_exit, | |
2682 | }; | |
2683 | ||
2684 | int __init igmp_mc_proc_init(void) | |
2685 | { | |
2686 | return register_pernet_subsys(&igmp_net_ops); | |
1da177e4 LT |
2687 | } |
2688 | #endif |