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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 LT |
151 | |
152 | static void ip_ma_put(struct ip_mc_list *im) | |
153 | { | |
154 | if (atomic_dec_and_test(&im->refcnt)) { | |
155 | in_dev_put(im->interface); | |
42ea299d | 156 | kfree_rcu(im, rcu); |
1da177e4 LT |
157 | } |
158 | } | |
159 | ||
d9aa9380 DM |
160 | #define for_each_pmc_rcu(in_dev, pmc) \ |
161 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
162 | pmc != NULL; \ | |
163 | pmc = rcu_dereference(pmc->next_rcu)) | |
164 | ||
165 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
166 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
167 | pmc != NULL; \ | |
168 | pmc = rtnl_dereference(pmc->next_rcu)) | |
169 | ||
1da177e4 LT |
170 | #ifdef CONFIG_IP_MULTICAST |
171 | ||
172 | /* | |
173 | * Timer management | |
174 | */ | |
175 | ||
1d7138de | 176 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
177 | { |
178 | spin_lock_bh(&im->lock); | |
179 | if (del_timer(&im->timer)) | |
180 | atomic_dec(&im->refcnt); | |
a7e9ff73 | 181 | im->tm_running = 0; |
1da177e4 LT |
182 | im->reporter = 0; |
183 | im->unsolicit_count = 0; | |
184 | spin_unlock_bh(&im->lock); | |
185 | } | |
186 | ||
187 | /* It must be called with locked im->lock */ | |
188 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
189 | { | |
a7e9ff73 | 190 | int tv = net_random() % max_delay; |
1da177e4 | 191 | |
a7e9ff73 | 192 | im->tm_running = 1; |
1da177e4 LT |
193 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
194 | atomic_inc(&im->refcnt); | |
195 | } | |
196 | ||
197 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
198 | { | |
199 | int tv = net_random() % in_dev->mr_maxdelay; | |
200 | ||
201 | in_dev->mr_gq_running = 1; | |
202 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
203 | in_dev_hold(in_dev); | |
204 | } | |
205 | ||
206 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
207 | { | |
208 | int tv = net_random() % delay; | |
209 | ||
210 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
211 | in_dev_hold(in_dev); | |
212 | } | |
213 | ||
214 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
215 | { | |
216 | spin_lock_bh(&im->lock); | |
217 | im->unsolicit_count = 0; | |
218 | if (del_timer(&im->timer)) { | |
219 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
220 | add_timer(&im->timer); | |
a7e9ff73 | 221 | im->tm_running = 1; |
1da177e4 LT |
222 | spin_unlock_bh(&im->lock); |
223 | return; | |
224 | } | |
225 | atomic_dec(&im->refcnt); | |
226 | } | |
227 | igmp_start_timer(im, max_delay); | |
228 | spin_unlock_bh(&im->lock); | |
229 | } | |
230 | ||
231 | ||
232 | /* | |
233 | * Send an IGMP report. | |
234 | */ | |
235 | ||
236 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
237 | ||
238 | ||
239 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
240 | int gdeleted, int sdeleted) | |
241 | { | |
242 | switch (type) { | |
243 | case IGMPV3_MODE_IS_INCLUDE: | |
244 | case IGMPV3_MODE_IS_EXCLUDE: | |
245 | if (gdeleted || sdeleted) | |
246 | return 0; | |
ad12583f DS |
247 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
248 | if (pmc->sfmode == MCAST_INCLUDE) | |
249 | return 1; | |
250 | /* don't include if this source is excluded | |
251 | * in all filters | |
252 | */ | |
253 | if (psf->sf_count[MCAST_INCLUDE]) | |
254 | return type == IGMPV3_MODE_IS_INCLUDE; | |
255 | return pmc->sfcount[MCAST_EXCLUDE] == | |
256 | psf->sf_count[MCAST_EXCLUDE]; | |
257 | } | |
258 | return 0; | |
1da177e4 LT |
259 | case IGMPV3_CHANGE_TO_INCLUDE: |
260 | if (gdeleted || sdeleted) | |
261 | return 0; | |
262 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
263 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
264 | if (gdeleted || sdeleted) | |
265 | return 0; | |
266 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
267 | psf->sf_count[MCAST_INCLUDE]) | |
268 | return 0; | |
269 | return pmc->sfcount[MCAST_EXCLUDE] == | |
270 | psf->sf_count[MCAST_EXCLUDE]; | |
271 | case IGMPV3_ALLOW_NEW_SOURCES: | |
272 | if (gdeleted || !psf->sf_crcount) | |
273 | return 0; | |
274 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
275 | case IGMPV3_BLOCK_OLD_SOURCES: | |
276 | if (pmc->sfmode == MCAST_INCLUDE) | |
277 | return gdeleted || (psf->sf_crcount && sdeleted); | |
278 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
279 | } | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static int | |
284 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
285 | { | |
286 | struct ip_sf_list *psf; | |
287 | int scount = 0; | |
288 | ||
289 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
290 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) | |
291 | continue; | |
292 | scount++; | |
293 | } | |
294 | return scount; | |
295 | } | |
296 | ||
57e1ab6e ED |
297 | #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb)) |
298 | ||
1da177e4 LT |
299 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) |
300 | { | |
301 | struct sk_buff *skb; | |
302 | struct rtable *rt; | |
303 | struct iphdr *pip; | |
304 | struct igmpv3_report *pig; | |
877acedc | 305 | struct net *net = dev_net(dev); |
31e4543d | 306 | struct flowi4 fl4; |
1da177e4 | 307 | |
57e1ab6e ED |
308 | while (1) { |
309 | skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), | |
310 | GFP_ATOMIC | __GFP_NOWARN); | |
311 | if (skb) | |
312 | break; | |
313 | size >>= 1; | |
314 | if (size < 256) | |
315 | return NULL; | |
316 | } | |
317 | igmp_skb_size(skb) = size; | |
1da177e4 | 318 | |
31e4543d | 319 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
320 | 0, 0, |
321 | IPPROTO_IGMP, 0, dev->ifindex); | |
322 | if (IS_ERR(rt)) { | |
323 | kfree_skb(skb); | |
324 | return NULL; | |
1da177e4 | 325 | } |
1da177e4 | 326 | |
d8d1f30b | 327 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
328 | skb->dev = dev; |
329 | ||
330 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
331 | ||
7e28ecc2 | 332 | skb_reset_network_header(skb); |
eddc9ec5 | 333 | pip = ip_hdr(skb); |
7e28ecc2 | 334 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
335 | |
336 | pip->version = 4; | |
337 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
338 | pip->tos = 0xc0; | |
339 | pip->frag_off = htons(IP_DF); | |
340 | pip->ttl = 1; | |
492f64ce DM |
341 | pip->daddr = fl4.daddr; |
342 | pip->saddr = fl4.saddr; | |
1da177e4 LT |
343 | pip->protocol = IPPROTO_IGMP; |
344 | pip->tot_len = 0; /* filled in later */ | |
d8d1f30b | 345 | ip_select_ident(pip, &rt->dst, NULL); |
1da177e4 LT |
346 | ((u8*)&pip[1])[0] = IPOPT_RA; |
347 | ((u8*)&pip[1])[1] = 4; | |
348 | ((u8*)&pip[1])[2] = 0; | |
349 | ((u8*)&pip[1])[3] = 0; | |
350 | ||
b0e380b1 | 351 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 352 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 353 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
354 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
355 | pig->resv1 = 0; | |
356 | pig->csum = 0; | |
357 | pig->resv2 = 0; | |
358 | pig->ngrec = 0; | |
359 | return skb; | |
360 | } | |
361 | ||
362 | static int igmpv3_sendpack(struct sk_buff *skb) | |
363 | { | |
d9edf9e2 | 364 | struct igmphdr *pig = igmp_hdr(skb); |
27a884dc | 365 | const int igmplen = skb->tail - skb->transport_header; |
1da177e4 | 366 | |
d9edf9e2 | 367 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 368 | |
c439cb2e | 369 | return ip_local_out(skb); |
1da177e4 LT |
370 | } |
371 | ||
372 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
373 | { | |
a7e9ff73 | 374 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
375 | } |
376 | ||
377 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
378 | int type, struct igmpv3_grec **ppgr) | |
379 | { | |
380 | struct net_device *dev = pmc->interface->dev; | |
381 | struct igmpv3_report *pih; | |
382 | struct igmpv3_grec *pgr; | |
383 | ||
384 | if (!skb) | |
385 | skb = igmpv3_newpack(dev, dev->mtu); | |
386 | if (!skb) | |
387 | return NULL; | |
388 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
389 | pgr->grec_type = type; | |
390 | pgr->grec_auxwords = 0; | |
391 | pgr->grec_nsrcs = 0; | |
392 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 393 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
394 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
395 | *ppgr = pgr; | |
396 | return skb; | |
397 | } | |
398 | ||
57e1ab6e | 399 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \ |
1da177e4 LT |
400 | skb_tailroom(skb)) : 0) |
401 | ||
402 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
403 | int type, int gdeleted, int sdeleted) | |
404 | { | |
405 | struct net_device *dev = pmc->interface->dev; | |
406 | struct igmpv3_report *pih; | |
407 | struct igmpv3_grec *pgr = NULL; | |
408 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 409 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
410 | |
411 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
412 | return skb; | |
413 | ||
414 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
415 | type == IGMPV3_MODE_IS_EXCLUDE; | |
416 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
417 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
418 | ||
ad12583f DS |
419 | stotal = scount = 0; |
420 | ||
1da177e4 LT |
421 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
422 | ||
ad12583f DS |
423 | if (!*psf_list) |
424 | goto empty_source; | |
425 | ||
d9edf9e2 | 426 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
427 | |
428 | /* EX and TO_EX get a fresh packet, if needed */ | |
429 | if (truncate) { | |
430 | if (pih && pih->ngrec && | |
431 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
432 | if (skb) | |
433 | igmpv3_sendpack(skb); | |
434 | skb = igmpv3_newpack(dev, dev->mtu); | |
435 | } | |
436 | } | |
437 | first = 1; | |
1da177e4 LT |
438 | psf_prev = NULL; |
439 | for (psf=*psf_list; psf; psf=psf_next) { | |
ea4d9e72 | 440 | __be32 *psrc; |
1da177e4 LT |
441 | |
442 | psf_next = psf->sf_next; | |
443 | ||
444 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
445 | psf_prev = psf; | |
446 | continue; | |
447 | } | |
448 | ||
449 | /* clear marks on query responses */ | |
450 | if (isquery) | |
451 | psf->sf_gsresp = 0; | |
452 | ||
63007727 | 453 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
454 | first*sizeof(struct igmpv3_grec)) { |
455 | if (truncate && !first) | |
456 | break; /* truncate these */ | |
457 | if (pgr) | |
458 | pgr->grec_nsrcs = htons(scount); | |
459 | if (skb) | |
460 | igmpv3_sendpack(skb); | |
461 | skb = igmpv3_newpack(dev, dev->mtu); | |
462 | first = 1; | |
463 | scount = 0; | |
464 | } | |
465 | if (first) { | |
466 | skb = add_grhead(skb, pmc, type, &pgr); | |
467 | first = 0; | |
468 | } | |
cc63f70b AD |
469 | if (!skb) |
470 | return NULL; | |
63007727 | 471 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 472 | *psrc = psf->sf_inaddr; |
ad12583f | 473 | scount++; stotal++; |
1da177e4 LT |
474 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
475 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
476 | psf->sf_crcount--; | |
477 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
478 | if (psf_prev) | |
479 | psf_prev->sf_next = psf->sf_next; | |
480 | else | |
481 | *psf_list = psf->sf_next; | |
482 | kfree(psf); | |
483 | continue; | |
484 | } | |
485 | } | |
486 | psf_prev = psf; | |
487 | } | |
ad12583f DS |
488 | |
489 | empty_source: | |
490 | if (!stotal) { | |
491 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
492 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
493 | return skb; | |
494 | if (pmc->crcount || isquery) { | |
495 | /* make sure we have room for group header */ | |
496 | if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { | |
497 | igmpv3_sendpack(skb); | |
498 | skb = NULL; /* add_grhead will get a new one */ | |
499 | } | |
500 | skb = add_grhead(skb, pmc, type, &pgr); | |
501 | } | |
502 | } | |
1da177e4 LT |
503 | if (pgr) |
504 | pgr->grec_nsrcs = htons(scount); | |
505 | ||
506 | if (isquery) | |
507 | pmc->gsquery = 0; /* clear query state on report */ | |
508 | return skb; | |
509 | } | |
510 | ||
511 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
512 | { | |
513 | struct sk_buff *skb = NULL; | |
514 | int type; | |
515 | ||
516 | if (!pmc) { | |
1d7138de ED |
517 | rcu_read_lock(); |
518 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
519 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
520 | continue; | |
521 | spin_lock_bh(&pmc->lock); | |
522 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
523 | type = IGMPV3_MODE_IS_EXCLUDE; | |
524 | else | |
525 | type = IGMPV3_MODE_IS_INCLUDE; | |
526 | skb = add_grec(skb, pmc, type, 0, 0); | |
527 | spin_unlock_bh(&pmc->lock); | |
528 | } | |
1d7138de | 529 | rcu_read_unlock(); |
1da177e4 LT |
530 | } else { |
531 | spin_lock_bh(&pmc->lock); | |
532 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
533 | type = IGMPV3_MODE_IS_EXCLUDE; | |
534 | else | |
535 | type = IGMPV3_MODE_IS_INCLUDE; | |
536 | skb = add_grec(skb, pmc, type, 0, 0); | |
537 | spin_unlock_bh(&pmc->lock); | |
538 | } | |
539 | if (!skb) | |
540 | return 0; | |
541 | return igmpv3_sendpack(skb); | |
542 | } | |
543 | ||
544 | /* | |
545 | * remove zero-count source records from a source filter list | |
546 | */ | |
547 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
548 | { | |
549 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
550 | ||
551 | psf_prev = NULL; | |
552 | for (psf=*ppsf; psf; psf = psf_next) { | |
553 | psf_next = psf->sf_next; | |
554 | if (psf->sf_crcount == 0) { | |
555 | if (psf_prev) | |
556 | psf_prev->sf_next = psf->sf_next; | |
557 | else | |
558 | *ppsf = psf->sf_next; | |
559 | kfree(psf); | |
560 | } else | |
561 | psf_prev = psf; | |
562 | } | |
563 | } | |
564 | ||
565 | static void igmpv3_send_cr(struct in_device *in_dev) | |
566 | { | |
567 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
568 | struct sk_buff *skb = NULL; | |
569 | int type, dtype; | |
570 | ||
1d7138de | 571 | rcu_read_lock(); |
1da177e4 LT |
572 | spin_lock_bh(&in_dev->mc_tomb_lock); |
573 | ||
574 | /* deleted MCA's */ | |
575 | pmc_prev = NULL; | |
576 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { | |
577 | pmc_next = pmc->next; | |
578 | if (pmc->sfmode == MCAST_INCLUDE) { | |
579 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
580 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
581 | skb = add_grec(skb, pmc, type, 1, 0); | |
582 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
583 | } | |
584 | if (pmc->crcount) { | |
1da177e4 LT |
585 | if (pmc->sfmode == MCAST_EXCLUDE) { |
586 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
587 | skb = add_grec(skb, pmc, type, 1, 0); | |
588 | } | |
ad12583f | 589 | pmc->crcount--; |
1da177e4 LT |
590 | if (pmc->crcount == 0) { |
591 | igmpv3_clear_zeros(&pmc->tomb); | |
592 | igmpv3_clear_zeros(&pmc->sources); | |
593 | } | |
594 | } | |
595 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
596 | if (pmc_prev) | |
597 | pmc_prev->next = pmc_next; | |
598 | else | |
599 | in_dev->mc_tomb = pmc_next; | |
600 | in_dev_put(pmc->interface); | |
601 | kfree(pmc); | |
602 | } else | |
603 | pmc_prev = pmc; | |
604 | } | |
605 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
606 | ||
607 | /* change recs */ | |
1d7138de | 608 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
609 | spin_lock_bh(&pmc->lock); |
610 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
611 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
612 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
613 | } else { | |
614 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
615 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
616 | } | |
617 | skb = add_grec(skb, pmc, type, 0, 0); | |
618 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
619 | ||
620 | /* filter mode changes */ | |
621 | if (pmc->crcount) { | |
1da177e4 LT |
622 | if (pmc->sfmode == MCAST_EXCLUDE) |
623 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
624 | else | |
625 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
626 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 627 | pmc->crcount--; |
1da177e4 LT |
628 | } |
629 | spin_unlock_bh(&pmc->lock); | |
630 | } | |
1d7138de | 631 | rcu_read_unlock(); |
1da177e4 LT |
632 | |
633 | if (!skb) | |
634 | return; | |
635 | (void) igmpv3_sendpack(skb); | |
636 | } | |
637 | ||
638 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
639 | int type) | |
640 | { | |
641 | struct sk_buff *skb; | |
642 | struct iphdr *iph; | |
643 | struct igmphdr *ih; | |
644 | struct rtable *rt; | |
645 | struct net_device *dev = in_dev->dev; | |
877acedc | 646 | struct net *net = dev_net(dev); |
63007727 | 647 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 648 | struct flowi4 fl4; |
63007727 | 649 | __be32 dst; |
1da177e4 LT |
650 | |
651 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
652 | return igmpv3_send_report(in_dev, pmc); | |
653 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
654 | dst = IGMP_ALL_ROUTER; | |
655 | else | |
656 | dst = group; | |
657 | ||
31e4543d | 658 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
659 | 0, 0, |
660 | IPPROTO_IGMP, 0, dev->ifindex); | |
661 | if (IS_ERR(rt)) | |
662 | return -1; | |
663 | ||
a7e9ff73 | 664 | skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); |
1da177e4 LT |
665 | if (skb == NULL) { |
666 | ip_rt_put(rt); | |
667 | return -1; | |
668 | } | |
669 | ||
d8d1f30b | 670 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
671 | |
672 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
673 | ||
7e28ecc2 | 674 | skb_reset_network_header(skb); |
eddc9ec5 | 675 | iph = ip_hdr(skb); |
7e28ecc2 | 676 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
677 | |
678 | iph->version = 4; | |
679 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
680 | iph->tos = 0xc0; | |
681 | iph->frag_off = htons(IP_DF); | |
682 | iph->ttl = 1; | |
683 | iph->daddr = dst; | |
492f64ce | 684 | iph->saddr = fl4.saddr; |
1da177e4 | 685 | iph->protocol = IPPROTO_IGMP; |
d8d1f30b | 686 | ip_select_ident(iph, &rt->dst, NULL); |
1da177e4 LT |
687 | ((u8*)&iph[1])[0] = IPOPT_RA; |
688 | ((u8*)&iph[1])[1] = 4; | |
689 | ((u8*)&iph[1])[2] = 0; | |
690 | ((u8*)&iph[1])[3] = 0; | |
1da177e4 LT |
691 | |
692 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
693 | ih->type = type; |
694 | ih->code = 0; | |
695 | ih->csum = 0; | |
696 | ih->group = group; | |
697 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 698 | |
c439cb2e | 699 | return ip_local_out(skb); |
1da177e4 LT |
700 | } |
701 | ||
702 | static void igmp_gq_timer_expire(unsigned long data) | |
703 | { | |
704 | struct in_device *in_dev = (struct in_device *)data; | |
705 | ||
706 | in_dev->mr_gq_running = 0; | |
707 | igmpv3_send_report(in_dev, NULL); | |
708 | __in_dev_put(in_dev); | |
709 | } | |
710 | ||
711 | static void igmp_ifc_timer_expire(unsigned long data) | |
712 | { | |
713 | struct in_device *in_dev = (struct in_device *)data; | |
714 | ||
715 | igmpv3_send_cr(in_dev); | |
716 | if (in_dev->mr_ifc_count) { | |
717 | in_dev->mr_ifc_count--; | |
718 | igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); | |
719 | } | |
720 | __in_dev_put(in_dev); | |
721 | } | |
722 | ||
723 | static void igmp_ifc_event(struct in_device *in_dev) | |
724 | { | |
725 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
726 | return; | |
e905a9ed | 727 | in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
728 | IGMP_Unsolicited_Report_Count; |
729 | igmp_ifc_start_timer(in_dev, 1); | |
730 | } | |
731 | ||
732 | ||
733 | static void igmp_timer_expire(unsigned long data) | |
734 | { | |
735 | struct ip_mc_list *im=(struct ip_mc_list *)data; | |
736 | struct in_device *in_dev = im->interface; | |
737 | ||
738 | spin_lock(&im->lock); | |
a7e9ff73 | 739 | im->tm_running = 0; |
1da177e4 LT |
740 | |
741 | if (im->unsolicit_count) { | |
742 | im->unsolicit_count--; | |
743 | igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); | |
744 | } | |
745 | im->reporter = 1; | |
746 | spin_unlock(&im->lock); | |
747 | ||
748 | if (IGMP_V1_SEEN(in_dev)) | |
749 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
750 | else if (IGMP_V2_SEEN(in_dev)) | |
751 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
752 | else | |
753 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
754 | ||
755 | ip_ma_put(im); | |
756 | } | |
757 | ||
ad12583f | 758 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 759 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
760 | { |
761 | struct ip_sf_list *psf; | |
762 | int i, scount; | |
763 | ||
ad12583f DS |
764 | scount = 0; |
765 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
766 | if (scount == nsrcs) | |
767 | break; | |
768 | for (i=0; i<nsrcs; i++) { | |
769 | /* skip inactive filters */ | |
e05c4ad3 | 770 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
771 | pmc->sfcount[MCAST_EXCLUDE] != |
772 | psf->sf_count[MCAST_EXCLUDE]) | |
773 | continue; | |
774 | if (srcs[i] == psf->sf_inaddr) { | |
775 | scount++; | |
776 | break; | |
777 | } | |
778 | } | |
779 | } | |
780 | pmc->gsquery = 0; | |
781 | if (scount == nsrcs) /* all sources excluded */ | |
782 | return 0; | |
783 | return 1; | |
784 | } | |
785 | ||
ea4d9e72 | 786 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
787 | { |
788 | struct ip_sf_list *psf; | |
789 | int i, scount; | |
790 | ||
791 | if (pmc->sfmode == MCAST_EXCLUDE) | |
792 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
793 | ||
794 | /* mark INCLUDE-mode sources */ | |
1da177e4 LT |
795 | scount = 0; |
796 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
797 | if (scount == nsrcs) | |
798 | break; | |
799 | for (i=0; i<nsrcs; i++) | |
800 | if (srcs[i] == psf->sf_inaddr) { | |
801 | psf->sf_gsresp = 1; | |
802 | scount++; | |
803 | break; | |
804 | } | |
805 | } | |
ad12583f DS |
806 | if (!scount) { |
807 | pmc->gsquery = 0; | |
808 | return 0; | |
809 | } | |
810 | pmc->gsquery = 1; | |
811 | return 1; | |
1da177e4 LT |
812 | } |
813 | ||
63007727 | 814 | static void igmp_heard_report(struct in_device *in_dev, __be32 group) |
1da177e4 LT |
815 | { |
816 | struct ip_mc_list *im; | |
817 | ||
818 | /* Timers are only set for non-local groups */ | |
819 | ||
820 | if (group == IGMP_ALL_HOSTS) | |
821 | return; | |
822 | ||
1d7138de ED |
823 | rcu_read_lock(); |
824 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
825 | if (im->multiaddr == group) { |
826 | igmp_stop_timer(im); | |
827 | break; | |
828 | } | |
829 | } | |
1d7138de | 830 | rcu_read_unlock(); |
1da177e4 LT |
831 | } |
832 | ||
833 | static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
834 | int len) | |
835 | { | |
d9edf9e2 ACM |
836 | struct igmphdr *ih = igmp_hdr(skb); |
837 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 838 | struct ip_mc_list *im; |
63007727 | 839 | __be32 group = ih->group; |
1da177e4 LT |
840 | int max_delay; |
841 | int mark = 0; | |
842 | ||
843 | ||
5b7c8406 | 844 | if (len == 8) { |
1da177e4 LT |
845 | if (ih->code == 0) { |
846 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 847 | |
1da177e4 LT |
848 | max_delay = IGMP_Query_Response_Interval; |
849 | in_dev->mr_v1_seen = jiffies + | |
850 | IGMP_V1_Router_Present_Timeout; | |
851 | group = 0; | |
852 | } else { | |
853 | /* v2 router present */ | |
854 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
855 | in_dev->mr_v2_seen = jiffies + | |
856 | IGMP_V2_Router_Present_Timeout; | |
857 | } | |
858 | /* cancel the interface change timer */ | |
859 | in_dev->mr_ifc_count = 0; | |
860 | if (del_timer(&in_dev->mr_ifc_timer)) | |
861 | __in_dev_put(in_dev); | |
862 | /* clear deleted report items */ | |
863 | igmpv3_clear_delrec(in_dev); | |
864 | } else if (len < 12) { | |
865 | return; /* ignore bogus packet; freed by caller */ | |
5b7c8406 DS |
866 | } else if (IGMP_V1_SEEN(in_dev)) { |
867 | /* This is a v3 query with v1 queriers present */ | |
868 | max_delay = IGMP_Query_Response_Interval; | |
869 | group = 0; | |
870 | } else if (IGMP_V2_SEEN(in_dev)) { | |
871 | /* this is a v3 query with v2 queriers present; | |
872 | * Interpretation of the max_delay code is problematic here. | |
873 | * A real v2 host would use ih_code directly, while v3 has a | |
874 | * different encoding. We use the v3 encoding as more likely | |
875 | * to be intended in a v3 query. | |
876 | */ | |
877 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
1da177e4 LT |
878 | } else { /* v3 */ |
879 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
880 | return; | |
e905a9ed | 881 | |
d9edf9e2 | 882 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 883 | if (ih3->nsrcs) { |
e905a9ed | 884 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 885 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
1da177e4 | 886 | return; |
d9edf9e2 | 887 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
888 | } |
889 | ||
890 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
891 | if (!max_delay) | |
892 | max_delay = 1; /* can't mod w/ 0 */ | |
893 | in_dev->mr_maxdelay = max_delay; | |
894 | if (ih3->qrv) | |
895 | in_dev->mr_qrv = ih3->qrv; | |
896 | if (!group) { /* general query */ | |
897 | if (ih3->nsrcs) | |
898 | return; /* no sources allowed */ | |
899 | igmp_gq_start_timer(in_dev); | |
900 | return; | |
901 | } | |
902 | /* mark sources to include, if group & source-specific */ | |
903 | mark = ih3->nsrcs != 0; | |
904 | } | |
905 | ||
906 | /* | |
907 | * - Start the timers in all of our membership records | |
908 | * that the query applies to for the interface on | |
909 | * which the query arrived excl. those that belong | |
910 | * to a "local" group (224.0.0.X) | |
911 | * - For timers already running check if they need to | |
912 | * be reset. | |
913 | * - Use the igmp->igmp_code field as the maximum | |
914 | * delay possible | |
915 | */ | |
1d7138de ED |
916 | rcu_read_lock(); |
917 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
918 | int changed; |
919 | ||
1da177e4 LT |
920 | if (group && group != im->multiaddr) |
921 | continue; | |
922 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
923 | continue; | |
924 | spin_lock_bh(&im->lock); | |
925 | if (im->tm_running) | |
926 | im->gsquery = im->gsquery && mark; | |
927 | else | |
928 | im->gsquery = mark; | |
ad12583f | 929 | changed = !im->gsquery || |
e905a9ed | 930 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 931 | spin_unlock_bh(&im->lock); |
ad12583f DS |
932 | if (changed) |
933 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 934 | } |
1d7138de | 935 | rcu_read_unlock(); |
1da177e4 LT |
936 | } |
937 | ||
9a57a9d2 | 938 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
939 | int igmp_rcv(struct sk_buff *skb) |
940 | { | |
941 | /* This basically follows the spec line by line -- see RFC1112 */ | |
942 | struct igmphdr *ih; | |
9a57a9d2 | 943 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 LT |
944 | int len = skb->len; |
945 | ||
cd557bc1 DL |
946 | if (in_dev == NULL) |
947 | goto drop; | |
1da177e4 | 948 | |
fb286bb2 | 949 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 950 | goto drop; |
fb286bb2 HX |
951 | |
952 | switch (skb->ip_summed) { | |
84fa7933 | 953 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 954 | if (!csum_fold(skb->csum)) |
fb286bb2 HX |
955 | break; |
956 | /* fall through */ | |
957 | case CHECKSUM_NONE: | |
958 | skb->csum = 0; | |
959 | if (__skb_checksum_complete(skb)) | |
9a57a9d2 | 960 | goto drop; |
1da177e4 LT |
961 | } |
962 | ||
d9edf9e2 | 963 | ih = igmp_hdr(skb); |
1da177e4 LT |
964 | switch (ih->type) { |
965 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
966 | igmp_heard_query(in_dev, skb, len); | |
967 | break; | |
968 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
969 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 970 | /* Is it our report looped back? */ |
c7537967 | 971 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 972 | break; |
24c69275 DS |
973 | /* don't rely on MC router hearing unicast reports */ |
974 | if (skb->pkt_type == PACKET_MULTICAST || | |
975 | skb->pkt_type == PACKET_BROADCAST) | |
976 | igmp_heard_report(in_dev, ih->group); | |
1da177e4 LT |
977 | break; |
978 | case IGMP_PIM: | |
979 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
980 | return pim_rcv_v1(skb); |
981 | #endif | |
c6b471e6 | 982 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
983 | case IGMP_DVMRP: |
984 | case IGMP_TRACE: | |
985 | case IGMP_HOST_LEAVE_MESSAGE: | |
986 | case IGMP_MTRACE: | |
987 | case IGMP_MTRACE_RESP: | |
988 | break; | |
989 | default: | |
dd1c1853 | 990 | break; |
1da177e4 | 991 | } |
fb286bb2 | 992 | |
cd557bc1 | 993 | drop: |
1da177e4 LT |
994 | kfree_skb(skb); |
995 | return 0; | |
996 | } | |
997 | ||
998 | #endif | |
999 | ||
1000 | ||
1001 | /* | |
1002 | * Add a filter to a device | |
1003 | */ | |
1004 | ||
63007727 | 1005 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1006 | { |
1007 | char buf[MAX_ADDR_LEN]; | |
1008 | struct net_device *dev = in_dev->dev; | |
1009 | ||
1010 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1011 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1012 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1013 | routine. Something sort of: |
1014 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1015 | --ANK | |
1016 | */ | |
1017 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1018 | dev_mc_add(dev, buf); |
1da177e4 LT |
1019 | } |
1020 | ||
1021 | /* | |
1022 | * Remove a filter from a device | |
1023 | */ | |
1024 | ||
63007727 | 1025 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1026 | { |
1027 | char buf[MAX_ADDR_LEN]; | |
1028 | struct net_device *dev = in_dev->dev; | |
1029 | ||
1030 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1031 | dev_mc_del(dev, buf); |
1da177e4 LT |
1032 | } |
1033 | ||
1034 | #ifdef CONFIG_IP_MULTICAST | |
1035 | /* | |
1036 | * deleted ip_mc_list manipulation | |
1037 | */ | |
1038 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1039 | { | |
1040 | struct ip_mc_list *pmc; | |
1041 | ||
1042 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1043 | * are actually used. In particular, the refcnt and users are not | |
1044 | * used for management of the delete list. Using the same structure | |
1045 | * for deleted items allows change reports to use common code with | |
1046 | * non-deleted or query-response MCA's. | |
1047 | */ | |
0da974f4 | 1048 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1049 | if (!pmc) |
1050 | return; | |
1da177e4 LT |
1051 | spin_lock_bh(&im->lock); |
1052 | pmc->interface = im->interface; | |
1053 | in_dev_hold(in_dev); | |
1054 | pmc->multiaddr = im->multiaddr; | |
1055 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1056 | IGMP_Unsolicited_Report_Count; | |
1057 | pmc->sfmode = im->sfmode; | |
1058 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1059 | struct ip_sf_list *psf; | |
1060 | ||
1061 | pmc->tomb = im->tomb; | |
1062 | pmc->sources = im->sources; | |
1063 | im->tomb = im->sources = NULL; | |
1064 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1065 | psf->sf_crcount = pmc->crcount; | |
1066 | } | |
1067 | spin_unlock_bh(&im->lock); | |
1068 | ||
1069 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1070 | pmc->next = in_dev->mc_tomb; | |
1071 | in_dev->mc_tomb = pmc; | |
1072 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1073 | } | |
1074 | ||
63007727 | 1075 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1076 | { |
1077 | struct ip_mc_list *pmc, *pmc_prev; | |
1078 | struct ip_sf_list *psf, *psf_next; | |
1079 | ||
1080 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1081 | pmc_prev = NULL; | |
1082 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { | |
1083 | if (pmc->multiaddr == multiaddr) | |
1084 | break; | |
1085 | pmc_prev = pmc; | |
1086 | } | |
1087 | if (pmc) { | |
1088 | if (pmc_prev) | |
1089 | pmc_prev->next = pmc->next; | |
1090 | else | |
1091 | in_dev->mc_tomb = pmc->next; | |
1092 | } | |
1093 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1094 | if (pmc) { | |
1095 | for (psf=pmc->tomb; psf; psf=psf_next) { | |
1096 | psf_next = psf->sf_next; | |
1097 | kfree(psf); | |
1098 | } | |
1099 | in_dev_put(pmc->interface); | |
1100 | kfree(pmc); | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1105 | { | |
1106 | struct ip_mc_list *pmc, *nextpmc; | |
1107 | ||
1108 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1109 | pmc = in_dev->mc_tomb; | |
1110 | in_dev->mc_tomb = NULL; | |
1111 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1112 | ||
1113 | for (; pmc; pmc = nextpmc) { | |
1114 | nextpmc = pmc->next; | |
1115 | ip_mc_clear_src(pmc); | |
1116 | in_dev_put(pmc->interface); | |
1117 | kfree(pmc); | |
1118 | } | |
1119 | /* clear dead sources, too */ | |
1d7138de ED |
1120 | rcu_read_lock(); |
1121 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1122 | struct ip_sf_list *psf, *psf_next; |
1123 | ||
1124 | spin_lock_bh(&pmc->lock); | |
1125 | psf = pmc->tomb; | |
1126 | pmc->tomb = NULL; | |
1127 | spin_unlock_bh(&pmc->lock); | |
1128 | for (; psf; psf=psf_next) { | |
1129 | psf_next = psf->sf_next; | |
1130 | kfree(psf); | |
1131 | } | |
1132 | } | |
1d7138de | 1133 | rcu_read_unlock(); |
1da177e4 LT |
1134 | } |
1135 | #endif | |
1136 | ||
1137 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1138 | { | |
1139 | struct in_device *in_dev = im->interface; | |
1140 | #ifdef CONFIG_IP_MULTICAST | |
1141 | int reporter; | |
1142 | #endif | |
1143 | ||
1144 | if (im->loaded) { | |
1145 | im->loaded = 0; | |
1146 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1147 | } | |
1148 | ||
1149 | #ifdef CONFIG_IP_MULTICAST | |
1150 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1151 | return; | |
1152 | ||
1153 | reporter = im->reporter; | |
1154 | igmp_stop_timer(im); | |
1155 | ||
1156 | if (!in_dev->dead) { | |
1157 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1158 | return; |
1da177e4 LT |
1159 | if (IGMP_V2_SEEN(in_dev)) { |
1160 | if (reporter) | |
1161 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1162 | return; |
1da177e4 LT |
1163 | } |
1164 | /* IGMPv3 */ | |
1165 | igmpv3_add_delrec(in_dev, im); | |
1166 | ||
1167 | igmp_ifc_event(in_dev); | |
1168 | } | |
1da177e4 | 1169 | #endif |
1da177e4 LT |
1170 | } |
1171 | ||
1172 | static void igmp_group_added(struct ip_mc_list *im) | |
1173 | { | |
1174 | struct in_device *in_dev = im->interface; | |
1175 | ||
1176 | if (im->loaded == 0) { | |
1177 | im->loaded = 1; | |
1178 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1179 | } | |
1180 | ||
1181 | #ifdef CONFIG_IP_MULTICAST | |
1182 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1183 | return; | |
1184 | ||
1185 | if (in_dev->dead) | |
1186 | return; | |
1187 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1188 | spin_lock_bh(&im->lock); | |
1189 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1190 | spin_unlock_bh(&im->lock); | |
1191 | return; | |
1192 | } | |
1193 | /* else, v3 */ | |
1194 | ||
1195 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1196 | IGMP_Unsolicited_Report_Count; | |
1197 | igmp_ifc_event(in_dev); | |
1198 | #endif | |
1199 | } | |
1200 | ||
1201 | ||
1202 | /* | |
1203 | * Multicast list managers | |
1204 | */ | |
1205 | ||
1206 | ||
1207 | /* | |
1208 | * A socket has joined a multicast group on device dev. | |
1209 | */ | |
1210 | ||
8f935bbd | 1211 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1212 | { |
1213 | struct ip_mc_list *im; | |
1214 | ||
1215 | ASSERT_RTNL(); | |
1216 | ||
1d7138de | 1217 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1218 | if (im->multiaddr == addr) { |
1219 | im->users++; | |
1220 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1221 | goto out; | |
1222 | } | |
1223 | } | |
1224 | ||
1d7138de | 1225 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1226 | if (!im) |
1227 | goto out; | |
1228 | ||
a7e9ff73 JK |
1229 | im->users = 1; |
1230 | im->interface = in_dev; | |
1da177e4 | 1231 | in_dev_hold(in_dev); |
a7e9ff73 | 1232 | im->multiaddr = addr; |
1da177e4 LT |
1233 | /* initial mode is (EX, empty) */ |
1234 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1235 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1236 | atomic_set(&im->refcnt, 1); |
1237 | spin_lock_init(&im->lock); | |
1238 | #ifdef CONFIG_IP_MULTICAST | |
b24b8a24 | 1239 | setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); |
1da177e4 | 1240 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; |
1da177e4 | 1241 | #endif |
1d7138de ED |
1242 | |
1243 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1244 | in_dev->mc_count++; |
a9b3cd7f | 1245 | RCU_INIT_POINTER(in_dev->mc_list, im); |
1d7138de | 1246 | |
1da177e4 LT |
1247 | #ifdef CONFIG_IP_MULTICAST |
1248 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1249 | #endif | |
1250 | igmp_group_added(im); | |
1251 | if (!in_dev->dead) | |
1252 | ip_rt_multicast_event(in_dev); | |
1253 | out: | |
1254 | return; | |
1255 | } | |
4bc2f18b | 1256 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1257 | |
a816c7c7 JV |
1258 | /* |
1259 | * Resend IGMP JOIN report; used for bonding. | |
866f3b25 | 1260 | * Called with rcu_read_lock() |
a816c7c7 | 1261 | */ |
866f3b25 | 1262 | void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1263 | { |
08882669 | 1264 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1265 | struct ip_mc_list *im; |
1266 | int type; | |
a816c7c7 | 1267 | |
866f3b25 ED |
1268 | for_each_pmc_rcu(in_dev, im) { |
1269 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1270 | continue; | |
a816c7c7 | 1271 | |
866f3b25 ED |
1272 | /* a failover is happening and switches |
1273 | * must be notified immediately | |
1274 | */ | |
1275 | if (IGMP_V1_SEEN(in_dev)) | |
1276 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1277 | else if (IGMP_V2_SEEN(in_dev)) | |
1278 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1279 | else | |
1280 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1281 | igmp_send_report(in_dev, im, type); | |
1282 | } | |
a816c7c7 JV |
1283 | #endif |
1284 | } | |
866f3b25 | 1285 | EXPORT_SYMBOL(ip_mc_rejoin_groups); |
a816c7c7 | 1286 | |
1da177e4 LT |
1287 | /* |
1288 | * A socket has left a multicast group on device dev | |
1289 | */ | |
1290 | ||
8f935bbd | 1291 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1292 | { |
1d7138de ED |
1293 | struct ip_mc_list *i; |
1294 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1295 | |
1da177e4 | 1296 | ASSERT_RTNL(); |
e905a9ed | 1297 | |
1d7138de ED |
1298 | for (ip = &in_dev->mc_list; |
1299 | (i = rtnl_dereference(*ip)) != NULL; | |
1300 | ip = &i->next_rcu) { | |
a7e9ff73 | 1301 | if (i->multiaddr == addr) { |
1da177e4 | 1302 | if (--i->users == 0) { |
1d7138de | 1303 | *ip = i->next_rcu; |
b8bae41e | 1304 | in_dev->mc_count--; |
1da177e4 | 1305 | igmp_group_dropped(i); |
24cf3af3 | 1306 | ip_mc_clear_src(i); |
1da177e4 LT |
1307 | |
1308 | if (!in_dev->dead) | |
1309 | ip_rt_multicast_event(in_dev); | |
1310 | ||
1311 | ip_ma_put(i); | |
1312 | return; | |
1313 | } | |
1314 | break; | |
1315 | } | |
1316 | } | |
1317 | } | |
4bc2f18b | 1318 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1319 | |
75c78500 MS |
1320 | /* Device changing type */ |
1321 | ||
1322 | void ip_mc_unmap(struct in_device *in_dev) | |
1323 | { | |
1d7138de | 1324 | struct ip_mc_list *pmc; |
75c78500 MS |
1325 | |
1326 | ASSERT_RTNL(); | |
1327 | ||
1d7138de ED |
1328 | for_each_pmc_rtnl(in_dev, pmc) |
1329 | igmp_group_dropped(pmc); | |
75c78500 MS |
1330 | } |
1331 | ||
1332 | void ip_mc_remap(struct in_device *in_dev) | |
1333 | { | |
1d7138de | 1334 | struct ip_mc_list *pmc; |
75c78500 MS |
1335 | |
1336 | ASSERT_RTNL(); | |
1337 | ||
1d7138de ED |
1338 | for_each_pmc_rtnl(in_dev, pmc) |
1339 | igmp_group_added(pmc); | |
75c78500 MS |
1340 | } |
1341 | ||
1da177e4 LT |
1342 | /* Device going down */ |
1343 | ||
1344 | void ip_mc_down(struct in_device *in_dev) | |
1345 | { | |
1d7138de | 1346 | struct ip_mc_list *pmc; |
1da177e4 LT |
1347 | |
1348 | ASSERT_RTNL(); | |
1349 | ||
1d7138de ED |
1350 | for_each_pmc_rtnl(in_dev, pmc) |
1351 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1352 | |
1353 | #ifdef CONFIG_IP_MULTICAST | |
1354 | in_dev->mr_ifc_count = 0; | |
1355 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1356 | __in_dev_put(in_dev); | |
1357 | in_dev->mr_gq_running = 0; | |
1358 | if (del_timer(&in_dev->mr_gq_timer)) | |
1359 | __in_dev_put(in_dev); | |
1360 | igmpv3_clear_delrec(in_dev); | |
1361 | #endif | |
1362 | ||
1363 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1364 | } | |
1365 | ||
1366 | void ip_mc_init_dev(struct in_device *in_dev) | |
1367 | { | |
1368 | ASSERT_RTNL(); | |
1369 | ||
1370 | in_dev->mc_tomb = NULL; | |
1371 | #ifdef CONFIG_IP_MULTICAST | |
1372 | in_dev->mr_gq_running = 0; | |
b24b8a24 PE |
1373 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1374 | (unsigned long)in_dev); | |
1da177e4 | 1375 | in_dev->mr_ifc_count = 0; |
b8bae41e | 1376 | in_dev->mc_count = 0; |
b24b8a24 PE |
1377 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1378 | (unsigned long)in_dev); | |
1da177e4 LT |
1379 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; |
1380 | #endif | |
1381 | ||
1da177e4 LT |
1382 | spin_lock_init(&in_dev->mc_tomb_lock); |
1383 | } | |
1384 | ||
1385 | /* Device going up */ | |
1386 | ||
1387 | void ip_mc_up(struct in_device *in_dev) | |
1388 | { | |
1d7138de | 1389 | struct ip_mc_list *pmc; |
1da177e4 LT |
1390 | |
1391 | ASSERT_RTNL(); | |
1392 | ||
1393 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1394 | ||
1d7138de ED |
1395 | for_each_pmc_rtnl(in_dev, pmc) |
1396 | igmp_group_added(pmc); | |
1da177e4 LT |
1397 | } |
1398 | ||
1399 | /* | |
1400 | * Device is about to be destroyed: clean up. | |
1401 | */ | |
1402 | ||
1403 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1404 | { | |
1405 | struct ip_mc_list *i; | |
1406 | ||
1407 | ASSERT_RTNL(); | |
1408 | ||
1409 | /* Deactivate timers */ | |
1410 | ip_mc_down(in_dev); | |
1411 | ||
1d7138de ED |
1412 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1413 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1414 | in_dev->mc_count--; |
1d7138de | 1415 | |
24cf3af3 VF |
1416 | /* We've dropped the groups in ip_mc_down already */ |
1417 | ip_mc_clear_src(i); | |
1da177e4 | 1418 | ip_ma_put(i); |
1da177e4 | 1419 | } |
1da177e4 LT |
1420 | } |
1421 | ||
9e917dca | 1422 | /* RTNL is locked */ |
877acedc | 1423 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1424 | { |
1da177e4 LT |
1425 | struct net_device *dev = NULL; |
1426 | struct in_device *idev = NULL; | |
1427 | ||
1428 | if (imr->imr_ifindex) { | |
877acedc | 1429 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1430 | return idev; |
1431 | } | |
1432 | if (imr->imr_address.s_addr) { | |
9e917dca | 1433 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1434 | if (!dev) |
1435 | return NULL; | |
1da177e4 LT |
1436 | } |
1437 | ||
b23dd4fe | 1438 | if (!dev) { |
78fbfd8a DM |
1439 | struct rtable *rt = ip_route_output(net, |
1440 | imr->imr_multiaddr.s_addr, | |
1441 | 0, 0, 0); | |
b23dd4fe DM |
1442 | if (!IS_ERR(rt)) { |
1443 | dev = rt->dst.dev; | |
1444 | ip_rt_put(rt); | |
1445 | } | |
1da177e4 LT |
1446 | } |
1447 | if (dev) { | |
1448 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1449 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1450 | } |
1451 | return idev; | |
1452 | } | |
1453 | ||
1454 | /* | |
1455 | * Join a socket to a group | |
1456 | */ | |
ab32ea5d BH |
1457 | int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; |
1458 | int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; | |
1da177e4 LT |
1459 | |
1460 | ||
1461 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1462 | __be32 *psfsrc) |
1da177e4 LT |
1463 | { |
1464 | struct ip_sf_list *psf, *psf_prev; | |
1465 | int rv = 0; | |
1466 | ||
1467 | psf_prev = NULL; | |
1468 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1469 | if (psf->sf_inaddr == *psfsrc) | |
1470 | break; | |
1471 | psf_prev = psf; | |
1472 | } | |
1473 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1474 | /* source filter not found, or count wrong => bug */ | |
1475 | return -ESRCH; | |
1476 | } | |
1477 | psf->sf_count[sfmode]--; | |
1478 | if (psf->sf_count[sfmode] == 0) { | |
1479 | ip_rt_multicast_event(pmc->interface); | |
1480 | } | |
1481 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1482 | #ifdef CONFIG_IP_MULTICAST | |
1483 | struct in_device *in_dev = pmc->interface; | |
1484 | #endif | |
1485 | ||
1486 | /* no more filters for this source */ | |
1487 | if (psf_prev) | |
1488 | psf_prev->sf_next = psf->sf_next; | |
1489 | else | |
1490 | pmc->sources = psf->sf_next; | |
1491 | #ifdef CONFIG_IP_MULTICAST | |
1492 | if (psf->sf_oldin && | |
1493 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
e905a9ed | 1494 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1495 | IGMP_Unsolicited_Report_Count; |
1496 | psf->sf_next = pmc->tomb; | |
1497 | pmc->tomb = psf; | |
1498 | rv = 1; | |
1499 | } else | |
1500 | #endif | |
1501 | kfree(psf); | |
1502 | } | |
1503 | return rv; | |
1504 | } | |
1505 | ||
1506 | #ifndef CONFIG_IP_MULTICAST | |
1507 | #define igmp_ifc_event(x) do { } while (0) | |
1508 | #endif | |
1509 | ||
8f935bbd AV |
1510 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1511 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1512 | { |
1513 | struct ip_mc_list *pmc; | |
1514 | int changerec = 0; | |
1515 | int i, err; | |
1516 | ||
1517 | if (!in_dev) | |
1518 | return -ENODEV; | |
1d7138de ED |
1519 | rcu_read_lock(); |
1520 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1521 | if (*pmca == pmc->multiaddr) |
1522 | break; | |
1523 | } | |
1524 | if (!pmc) { | |
1525 | /* MCA not found?? bug */ | |
1d7138de | 1526 | rcu_read_unlock(); |
1da177e4 LT |
1527 | return -ESRCH; |
1528 | } | |
1529 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1530 | rcu_read_unlock(); |
1da177e4 LT |
1531 | #ifdef CONFIG_IP_MULTICAST |
1532 | sf_markstate(pmc); | |
1533 | #endif | |
1534 | if (!delta) { | |
1535 | err = -EINVAL; | |
1536 | if (!pmc->sfcount[sfmode]) | |
1537 | goto out_unlock; | |
1538 | pmc->sfcount[sfmode]--; | |
1539 | } | |
1540 | err = 0; | |
1541 | for (i=0; i<sfcount; i++) { | |
1542 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1543 | ||
1544 | changerec |= rv > 0; | |
1545 | if (!err && rv < 0) | |
1546 | err = rv; | |
1547 | } | |
1548 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1549 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1550 | pmc->sfcount[MCAST_INCLUDE]) { | |
1551 | #ifdef CONFIG_IP_MULTICAST | |
1552 | struct ip_sf_list *psf; | |
1553 | #endif | |
1554 | ||
1555 | /* filter mode change */ | |
1556 | pmc->sfmode = MCAST_INCLUDE; | |
1557 | #ifdef CONFIG_IP_MULTICAST | |
e905a9ed | 1558 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1559 | IGMP_Unsolicited_Report_Count; |
1560 | in_dev->mr_ifc_count = pmc->crcount; | |
1561 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1562 | psf->sf_crcount = 0; | |
1563 | igmp_ifc_event(pmc->interface); | |
1564 | } else if (sf_setstate(pmc) || changerec) { | |
1565 | igmp_ifc_event(pmc->interface); | |
1566 | #endif | |
1567 | } | |
1568 | out_unlock: | |
1569 | spin_unlock_bh(&pmc->lock); | |
1570 | return err; | |
1571 | } | |
1572 | ||
1573 | /* | |
1574 | * Add multicast single-source filter to the interface list | |
1575 | */ | |
1576 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1577 | __be32 *psfsrc, int delta) |
1da177e4 LT |
1578 | { |
1579 | struct ip_sf_list *psf, *psf_prev; | |
1580 | ||
1581 | psf_prev = NULL; | |
1582 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1583 | if (psf->sf_inaddr == *psfsrc) | |
1584 | break; | |
1585 | psf_prev = psf; | |
1586 | } | |
1587 | if (!psf) { | |
0da974f4 | 1588 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1589 | if (!psf) |
1590 | return -ENOBUFS; | |
1da177e4 LT |
1591 | psf->sf_inaddr = *psfsrc; |
1592 | if (psf_prev) { | |
1593 | psf_prev->sf_next = psf; | |
1594 | } else | |
1595 | pmc->sources = psf; | |
1596 | } | |
1597 | psf->sf_count[sfmode]++; | |
1598 | if (psf->sf_count[sfmode] == 1) { | |
1599 | ip_rt_multicast_event(pmc->interface); | |
1600 | } | |
1601 | return 0; | |
1602 | } | |
1603 | ||
1604 | #ifdef CONFIG_IP_MULTICAST | |
1605 | static void sf_markstate(struct ip_mc_list *pmc) | |
1606 | { | |
1607 | struct ip_sf_list *psf; | |
1608 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1609 | ||
1610 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1611 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1612 | psf->sf_oldin = mca_xcount == | |
1613 | psf->sf_count[MCAST_EXCLUDE] && | |
1614 | !psf->sf_count[MCAST_INCLUDE]; | |
1615 | } else | |
1616 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1617 | } | |
1618 | ||
1619 | static int sf_setstate(struct ip_mc_list *pmc) | |
1620 | { | |
ad12583f | 1621 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1622 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1623 | int qrv = pmc->interface->mr_qrv; | |
1624 | int new_in, rv; | |
1625 | ||
1626 | rv = 0; | |
1627 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1628 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1629 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1630 | !psf->sf_count[MCAST_INCLUDE]; | |
1631 | } else | |
1632 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1633 | if (new_in) { |
1634 | if (!psf->sf_oldin) { | |
76edc605 | 1635 | struct ip_sf_list *prev = NULL; |
ad12583f DS |
1636 | |
1637 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { | |
1638 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1639 | break; | |
1640 | prev = dpsf; | |
1641 | } | |
1642 | if (dpsf) { | |
1643 | if (prev) | |
1644 | prev->sf_next = dpsf->sf_next; | |
1645 | else | |
1646 | pmc->tomb = dpsf->sf_next; | |
1647 | kfree(dpsf); | |
1648 | } | |
1649 | psf->sf_crcount = qrv; | |
1650 | rv++; | |
1651 | } | |
1652 | } else if (psf->sf_oldin) { | |
1653 | ||
1654 | psf->sf_crcount = 0; | |
1655 | /* | |
1656 | * add or update "delete" records if an active filter | |
1657 | * is now inactive | |
1658 | */ | |
1659 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) | |
1660 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1661 | break; | |
1662 | if (!dpsf) { | |
3ed37a6f | 1663 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1664 | if (!dpsf) |
1665 | continue; | |
1666 | *dpsf = *psf; | |
1667 | /* pmc->lock held by callers */ | |
1668 | dpsf->sf_next = pmc->tomb; | |
1669 | pmc->tomb = dpsf; | |
1670 | } | |
1671 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1672 | rv++; |
1673 | } | |
1674 | } | |
1675 | return rv; | |
1676 | } | |
1677 | #endif | |
1678 | ||
1679 | /* | |
1680 | * Add multicast source filter list to the interface list | |
1681 | */ | |
8f935bbd AV |
1682 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1683 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1684 | { |
1685 | struct ip_mc_list *pmc; | |
1686 | int isexclude; | |
1687 | int i, err; | |
1688 | ||
1689 | if (!in_dev) | |
1690 | return -ENODEV; | |
1d7138de ED |
1691 | rcu_read_lock(); |
1692 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1693 | if (*pmca == pmc->multiaddr) |
1694 | break; | |
1695 | } | |
1696 | if (!pmc) { | |
1697 | /* MCA not found?? bug */ | |
1d7138de | 1698 | rcu_read_unlock(); |
1da177e4 LT |
1699 | return -ESRCH; |
1700 | } | |
1701 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1702 | rcu_read_unlock(); |
1da177e4 LT |
1703 | |
1704 | #ifdef CONFIG_IP_MULTICAST | |
1705 | sf_markstate(pmc); | |
1706 | #endif | |
1707 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1708 | if (!delta) | |
1709 | pmc->sfcount[sfmode]++; | |
1710 | err = 0; | |
1711 | for (i=0; i<sfcount; i++) { | |
1712 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); | |
1713 | if (err) | |
1714 | break; | |
1715 | } | |
1716 | if (err) { | |
1717 | int j; | |
1718 | ||
685f94e6 JZ |
1719 | if (!delta) |
1720 | pmc->sfcount[sfmode]--; | |
1da177e4 | 1721 | for (j=0; j<i; j++) |
a1889c0d | 1722 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
1723 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
1724 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 1725 | struct ip_sf_list *psf; |
cfcabdcc | 1726 | in_dev = pmc->interface; |
1da177e4 LT |
1727 | #endif |
1728 | ||
1729 | /* filter mode change */ | |
1730 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1731 | pmc->sfmode = MCAST_EXCLUDE; | |
1732 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1733 | pmc->sfmode = MCAST_INCLUDE; | |
1734 | #ifdef CONFIG_IP_MULTICAST | |
1735 | /* else no filters; keep old mode for reports */ | |
1736 | ||
e905a9ed | 1737 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1738 | IGMP_Unsolicited_Report_Count; |
1739 | in_dev->mr_ifc_count = pmc->crcount; | |
1740 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1741 | psf->sf_crcount = 0; | |
1742 | igmp_ifc_event(in_dev); | |
1743 | } else if (sf_setstate(pmc)) { | |
1744 | igmp_ifc_event(in_dev); | |
1745 | #endif | |
1746 | } | |
1747 | spin_unlock_bh(&pmc->lock); | |
1748 | return err; | |
1749 | } | |
1750 | ||
1751 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1752 | { | |
1753 | struct ip_sf_list *psf, *nextpsf; | |
1754 | ||
1755 | for (psf=pmc->tomb; psf; psf=nextpsf) { | |
1756 | nextpsf = psf->sf_next; | |
1757 | kfree(psf); | |
1758 | } | |
1759 | pmc->tomb = NULL; | |
1760 | for (psf=pmc->sources; psf; psf=nextpsf) { | |
1761 | nextpsf = psf->sf_next; | |
1762 | kfree(psf); | |
1763 | } | |
1764 | pmc->sources = NULL; | |
1765 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1766 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1767 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1768 | } | |
1769 | ||
1770 | ||
1771 | /* | |
1772 | * Join a multicast group | |
1773 | */ | |
1774 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1775 | { | |
1776 | int err; | |
8f935bbd | 1777 | __be32 addr = imr->imr_multiaddr.s_addr; |
a7e9ff73 | 1778 | struct ip_mc_socklist *iml = NULL, *i; |
1da177e4 LT |
1779 | struct in_device *in_dev; |
1780 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 1781 | struct net *net = sock_net(sk); |
ca9b907d | 1782 | int ifindex; |
1da177e4 LT |
1783 | int count = 0; |
1784 | ||
f97c1e0c | 1785 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1786 | return -EINVAL; |
1787 | ||
6756ae4b | 1788 | rtnl_lock(); |
1da177e4 | 1789 | |
877acedc | 1790 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
1791 | |
1792 | if (!in_dev) { | |
1793 | iml = NULL; | |
1794 | err = -ENODEV; | |
1795 | goto done; | |
1796 | } | |
1797 | ||
1da177e4 | 1798 | err = -EADDRINUSE; |
ca9b907d | 1799 | ifindex = imr->imr_ifindex; |
1d7138de | 1800 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
1801 | if (i->multi.imr_multiaddr.s_addr == addr && |
1802 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1803 | goto done; |
1da177e4 LT |
1804 | count++; |
1805 | } | |
1806 | err = -ENOBUFS; | |
ca9b907d DS |
1807 | if (count >= sysctl_igmp_max_memberships) |
1808 | goto done; | |
a7e9ff73 | 1809 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
ca9b907d | 1810 | if (iml == NULL) |
1da177e4 | 1811 | goto done; |
ca9b907d | 1812 | |
1da177e4 | 1813 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 1814 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
1815 | iml->sflist = NULL; |
1816 | iml->sfmode = MCAST_EXCLUDE; | |
a9b3cd7f | 1817 | RCU_INIT_POINTER(inet->mc_list, iml); |
1da177e4 | 1818 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 1819 | err = 0; |
1da177e4 | 1820 | done: |
6756ae4b | 1821 | rtnl_unlock(); |
1da177e4 LT |
1822 | return err; |
1823 | } | |
4bc2f18b | 1824 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
1825 | |
1826 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
1827 | struct in_device *in_dev) | |
1828 | { | |
1d7138de | 1829 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
1830 | int err; |
1831 | ||
c85bb41e | 1832 | if (psf == NULL) { |
1da177e4 LT |
1833 | /* any-source empty exclude case */ |
1834 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1835 | iml->sfmode, 0, NULL, 0); | |
1836 | } | |
1837 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 1838 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 1839 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
1840 | /* decrease mem now to avoid the memleak warning */ |
1841 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 1842 | kfree_rcu(psf, rcu); |
1da177e4 LT |
1843 | return err; |
1844 | } | |
1845 | ||
1846 | /* | |
1847 | * Ask a socket to leave a group. | |
1848 | */ | |
1849 | ||
1850 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1851 | { | |
1852 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
1853 | struct ip_mc_socklist *iml; |
1854 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 1855 | struct in_device *in_dev; |
877acedc | 1856 | struct net *net = sock_net(sk); |
8f935bbd | 1857 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 1858 | u32 ifindex; |
acd6e00b | 1859 | int ret = -EADDRNOTAVAIL; |
1da177e4 LT |
1860 | |
1861 | rtnl_lock(); | |
877acedc | 1862 | in_dev = ip_mc_find_dev(net, imr); |
84b42bae | 1863 | ifindex = imr->imr_ifindex; |
1d7138de ED |
1864 | for (imlp = &inet->mc_list; |
1865 | (iml = rtnl_dereference(*imlp)) != NULL; | |
1866 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
1867 | if (iml->multi.imr_multiaddr.s_addr != group) |
1868 | continue; | |
1869 | if (ifindex) { | |
1870 | if (iml->multi.imr_ifindex != ifindex) | |
1871 | continue; | |
1872 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
1873 | iml->multi.imr_address.s_addr) | |
1874 | continue; | |
1da177e4 | 1875 | |
acd6e00b | 1876 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 1877 | |
1d7138de | 1878 | *imlp = iml->next_rcu; |
acd6e00b DS |
1879 | |
1880 | if (in_dev) | |
84b42bae | 1881 | ip_mc_dec_group(in_dev, group); |
acd6e00b | 1882 | rtnl_unlock(); |
c85bb41e FL |
1883 | /* decrease mem now to avoid the memleak warning */ |
1884 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 1885 | kfree_rcu(iml, rcu); |
acd6e00b | 1886 | return 0; |
1da177e4 | 1887 | } |
acd6e00b DS |
1888 | if (!in_dev) |
1889 | ret = -ENODEV; | |
1da177e4 | 1890 | rtnl_unlock(); |
acd6e00b | 1891 | return ret; |
1da177e4 LT |
1892 | } |
1893 | ||
1894 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1895 | ip_mreq_source *mreqs, int ifindex) | |
1896 | { | |
1897 | int err; | |
1898 | struct ip_mreqn imr; | |
63007727 | 1899 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
1900 | struct ip_mc_socklist *pmc; |
1901 | struct in_device *in_dev = NULL; | |
1902 | struct inet_sock *inet = inet_sk(sk); | |
1903 | struct ip_sf_socklist *psl; | |
877acedc | 1904 | struct net *net = sock_net(sk); |
8cdaaa15 | 1905 | int leavegroup = 0; |
1da177e4 LT |
1906 | int i, j, rv; |
1907 | ||
f97c1e0c | 1908 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1909 | return -EINVAL; |
1910 | ||
6756ae4b | 1911 | rtnl_lock(); |
1da177e4 LT |
1912 | |
1913 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1914 | imr.imr_address.s_addr = mreqs->imr_interface; | |
1915 | imr.imr_ifindex = ifindex; | |
877acedc | 1916 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
1917 | |
1918 | if (!in_dev) { | |
1919 | err = -ENODEV; | |
1920 | goto done; | |
1921 | } | |
1922 | err = -EADDRNOTAVAIL; | |
1923 | ||
1d7138de | 1924 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
1925 | if ((pmc->multi.imr_multiaddr.s_addr == |
1926 | imr.imr_multiaddr.s_addr) && | |
1927 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
1928 | break; |
1929 | } | |
917f2f10 DS |
1930 | if (!pmc) { /* must have a prior join */ |
1931 | err = -EINVAL; | |
1da177e4 | 1932 | goto done; |
917f2f10 | 1933 | } |
1da177e4 LT |
1934 | /* if a source filter was set, must be the same mode as before */ |
1935 | if (pmc->sflist) { | |
917f2f10 DS |
1936 | if (pmc->sfmode != omode) { |
1937 | err = -EINVAL; | |
1da177e4 | 1938 | goto done; |
917f2f10 | 1939 | } |
1da177e4 LT |
1940 | } else if (pmc->sfmode != omode) { |
1941 | /* allow mode switches for empty-set filters */ | |
1942 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 1943 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
1944 | NULL, 0); |
1945 | pmc->sfmode = omode; | |
1946 | } | |
1947 | ||
1d7138de | 1948 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
1949 | if (!add) { |
1950 | if (!psl) | |
917f2f10 | 1951 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 LT |
1952 | rv = !0; |
1953 | for (i=0; i<psl->sl_count; i++) { | |
1954 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 1955 | sizeof(__be32)); |
1da177e4 LT |
1956 | if (rv == 0) |
1957 | break; | |
1958 | } | |
1959 | if (rv) /* source not found */ | |
917f2f10 | 1960 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 1961 | |
8cdaaa15 DS |
1962 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1963 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
1964 | leavegroup = 1; | |
1965 | goto done; | |
1966 | } | |
1967 | ||
1da177e4 | 1968 | /* update the interface filter */ |
e905a9ed | 1969 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
1970 | &mreqs->imr_sourceaddr, 1); |
1971 | ||
1972 | for (j=i+1; j<psl->sl_count; j++) | |
1973 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
1974 | psl->sl_count--; | |
1975 | err = 0; | |
1976 | goto done; | |
1977 | } | |
1978 | /* else, add a new source to the filter */ | |
1979 | ||
1980 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
1981 | err = -ENOBUFS; | |
1982 | goto done; | |
1983 | } | |
1984 | if (!psl || psl->sl_count == psl->sl_max) { | |
1985 | struct ip_sf_socklist *newpsl; | |
1986 | int count = IP_SFBLOCK; | |
1987 | ||
1988 | if (psl) | |
1989 | count += psl->sl_max; | |
8b3a7005 | 1990 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
1991 | if (!newpsl) { |
1992 | err = -ENOBUFS; | |
1993 | goto done; | |
1994 | } | |
1995 | newpsl->sl_max = count; | |
1996 | newpsl->sl_count = count - IP_SFBLOCK; | |
1997 | if (psl) { | |
1998 | for (i=0; i<psl->sl_count; i++) | |
1999 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
c85bb41e FL |
2000 | /* decrease mem now to avoid the memleak warning */ |
2001 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2002 | kfree_rcu(psl, rcu); |
1da177e4 | 2003 | } |
a9b3cd7f | 2004 | RCU_INIT_POINTER(pmc->sflist, newpsl); |
c85bb41e | 2005 | psl = newpsl; |
1da177e4 LT |
2006 | } |
2007 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
2008 | for (i=0; i<psl->sl_count; i++) { | |
2009 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 2010 | sizeof(__be32)); |
1da177e4 LT |
2011 | if (rv == 0) |
2012 | break; | |
2013 | } | |
2014 | if (rv == 0) /* address already there is an error */ | |
2015 | goto done; | |
2016 | for (j=psl->sl_count-1; j>=i; j--) | |
2017 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
2018 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2019 | psl->sl_count++; | |
2020 | err = 0; | |
2021 | /* update the interface list */ | |
e905a9ed | 2022 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2023 | &mreqs->imr_sourceaddr, 1); |
2024 | done: | |
6756ae4b | 2025 | rtnl_unlock(); |
8cdaaa15 DS |
2026 | if (leavegroup) |
2027 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2028 | return err; |
2029 | } | |
2030 | ||
2031 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2032 | { | |
9951f036 | 2033 | int err = 0; |
1da177e4 | 2034 | struct ip_mreqn imr; |
63007727 | 2035 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2036 | struct ip_mc_socklist *pmc; |
2037 | struct in_device *in_dev; | |
2038 | struct inet_sock *inet = inet_sk(sk); | |
2039 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2040 | struct net *net = sock_net(sk); |
9951f036 | 2041 | int leavegroup = 0; |
1da177e4 | 2042 | |
f97c1e0c | 2043 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2044 | return -EINVAL; |
2045 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2046 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2047 | return -EINVAL; | |
2048 | ||
6756ae4b | 2049 | rtnl_lock(); |
1da177e4 LT |
2050 | |
2051 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2052 | imr.imr_address.s_addr = msf->imsf_interface; | |
2053 | imr.imr_ifindex = ifindex; | |
877acedc | 2054 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2055 | |
2056 | if (!in_dev) { | |
2057 | err = -ENODEV; | |
2058 | goto done; | |
2059 | } | |
1da177e4 | 2060 | |
9951f036 DS |
2061 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2062 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2063 | leavegroup = 1; | |
2064 | goto done; | |
2065 | } | |
2066 | ||
1d7138de | 2067 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2068 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2069 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2070 | break; | |
2071 | } | |
917f2f10 DS |
2072 | if (!pmc) { /* must have a prior join */ |
2073 | err = -EINVAL; | |
1da177e4 | 2074 | goto done; |
917f2f10 | 2075 | } |
1da177e4 | 2076 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2077 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2078 | GFP_KERNEL); | |
1da177e4 LT |
2079 | if (!newpsl) { |
2080 | err = -ENOBUFS; | |
2081 | goto done; | |
2082 | } | |
2083 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2084 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2085 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2086 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2087 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2088 | if (err) { | |
2089 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2090 | goto done; | |
2091 | } | |
8713dbf0 | 2092 | } else { |
1da177e4 | 2093 | newpsl = NULL; |
8713dbf0 YZ |
2094 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2095 | msf->imsf_fmode, 0, NULL, 0); | |
2096 | } | |
1d7138de | 2097 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2098 | if (psl) { |
2099 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2100 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2101 | /* decrease mem now to avoid the memleak warning */ |
2102 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2103 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2104 | } else |
2105 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2106 | 0, NULL, 0); | |
a9b3cd7f | 2107 | RCU_INIT_POINTER(pmc->sflist, newpsl); |
1da177e4 | 2108 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2109 | err = 0; |
1da177e4 | 2110 | done: |
6756ae4b | 2111 | rtnl_unlock(); |
9951f036 DS |
2112 | if (leavegroup) |
2113 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2114 | return err; |
2115 | } | |
2116 | ||
2117 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2118 | struct ip_msfilter __user *optval, int __user *optlen) | |
2119 | { | |
2120 | int err, len, count, copycount; | |
2121 | struct ip_mreqn imr; | |
63007727 | 2122 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2123 | struct ip_mc_socklist *pmc; |
2124 | struct in_device *in_dev; | |
2125 | struct inet_sock *inet = inet_sk(sk); | |
2126 | struct ip_sf_socklist *psl; | |
877acedc | 2127 | struct net *net = sock_net(sk); |
1da177e4 | 2128 | |
f97c1e0c | 2129 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2130 | return -EINVAL; |
2131 | ||
6756ae4b | 2132 | rtnl_lock(); |
1da177e4 LT |
2133 | |
2134 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2135 | imr.imr_address.s_addr = msf->imsf_interface; | |
2136 | imr.imr_ifindex = 0; | |
877acedc | 2137 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2138 | |
2139 | if (!in_dev) { | |
2140 | err = -ENODEV; | |
2141 | goto done; | |
2142 | } | |
2143 | err = -EADDRNOTAVAIL; | |
2144 | ||
1d7138de | 2145 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2146 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2147 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2148 | break; | |
2149 | } | |
2150 | if (!pmc) /* must have a prior join */ | |
2151 | goto done; | |
2152 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2153 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2154 | rtnl_unlock(); |
1da177e4 LT |
2155 | if (!psl) { |
2156 | len = 0; | |
2157 | count = 0; | |
2158 | } else { | |
2159 | count = psl->sl_count; | |
2160 | } | |
2161 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2162 | len = copycount * sizeof(psl->sl_addr[0]); | |
2163 | msf->imsf_numsrc = count; | |
2164 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2165 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2166 | return -EFAULT; | |
2167 | } | |
2168 | if (len && | |
2169 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2170 | return -EFAULT; | |
2171 | return 0; | |
2172 | done: | |
6756ae4b | 2173 | rtnl_unlock(); |
1da177e4 LT |
2174 | return err; |
2175 | } | |
2176 | ||
2177 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2178 | struct group_filter __user *optval, int __user *optlen) | |
2179 | { | |
2180 | int err, i, count, copycount; | |
2181 | struct sockaddr_in *psin; | |
63007727 | 2182 | __be32 addr; |
1da177e4 LT |
2183 | struct ip_mc_socklist *pmc; |
2184 | struct inet_sock *inet = inet_sk(sk); | |
2185 | struct ip_sf_socklist *psl; | |
2186 | ||
2187 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2188 | if (psin->sin_family != AF_INET) | |
2189 | return -EINVAL; | |
2190 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2191 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2192 | return -EINVAL; |
2193 | ||
6756ae4b | 2194 | rtnl_lock(); |
1da177e4 LT |
2195 | |
2196 | err = -EADDRNOTAVAIL; | |
2197 | ||
1d7138de | 2198 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2199 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2200 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2201 | break; | |
2202 | } | |
2203 | if (!pmc) /* must have a prior join */ | |
2204 | goto done; | |
2205 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2206 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2207 | rtnl_unlock(); |
1da177e4 LT |
2208 | count = psl ? psl->sl_count : 0; |
2209 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2210 | gsf->gf_numsrc = count; | |
2211 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2212 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2213 | return -EFAULT; | |
2214 | } | |
2215 | for (i=0; i<copycount; i++) { | |
1da177e4 LT |
2216 | struct sockaddr_storage ss; |
2217 | ||
2218 | psin = (struct sockaddr_in *)&ss; | |
2219 | memset(&ss, 0, sizeof(ss)); | |
2220 | psin->sin_family = AF_INET; | |
2221 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2222 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2223 | return -EFAULT; | |
2224 | } | |
2225 | return 0; | |
2226 | done: | |
6756ae4b | 2227 | rtnl_unlock(); |
1da177e4 LT |
2228 | return err; |
2229 | } | |
2230 | ||
2231 | /* | |
2232 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2233 | */ | |
c0cda068 | 2234 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2235 | { |
2236 | struct inet_sock *inet = inet_sk(sk); | |
2237 | struct ip_mc_socklist *pmc; | |
2238 | struct ip_sf_socklist *psl; | |
2239 | int i; | |
c85bb41e | 2240 | int ret; |
1da177e4 | 2241 | |
c85bb41e | 2242 | ret = 1; |
f97c1e0c | 2243 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2244 | goto out; |
1da177e4 | 2245 | |
c85bb41e | 2246 | rcu_read_lock(); |
1d7138de | 2247 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2248 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2249 | pmc->multi.imr_ifindex == dif) | |
2250 | break; | |
2251 | } | |
c85bb41e | 2252 | ret = inet->mc_all; |
1da177e4 | 2253 | if (!pmc) |
c85bb41e | 2254 | goto unlock; |
1d7138de | 2255 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2256 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2257 | if (!psl) |
c85bb41e | 2258 | goto unlock; |
1da177e4 LT |
2259 | |
2260 | for (i=0; i<psl->sl_count; i++) { | |
2261 | if (psl->sl_addr[i] == rmt_addr) | |
2262 | break; | |
2263 | } | |
c85bb41e | 2264 | ret = 0; |
1da177e4 | 2265 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2266 | goto unlock; |
1da177e4 | 2267 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2268 | goto unlock; |
2269 | ret = 1; | |
2270 | unlock: | |
2271 | rcu_read_unlock(); | |
2272 | out: | |
2273 | return ret; | |
1da177e4 LT |
2274 | } |
2275 | ||
2276 | /* | |
2277 | * A socket is closing. | |
2278 | */ | |
2279 | ||
2280 | void ip_mc_drop_socket(struct sock *sk) | |
2281 | { | |
2282 | struct inet_sock *inet = inet_sk(sk); | |
2283 | struct ip_mc_socklist *iml; | |
877acedc | 2284 | struct net *net = sock_net(sk); |
1da177e4 LT |
2285 | |
2286 | if (inet->mc_list == NULL) | |
2287 | return; | |
2288 | ||
2289 | rtnl_lock(); | |
1d7138de | 2290 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2291 | struct in_device *in_dev; |
1da177e4 | 2292 | |
1d7138de | 2293 | inet->mc_list = iml->next_rcu; |
877acedc | 2294 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2295 | (void) ip_mc_leave_src(sk, iml, in_dev); |
18943d29 | 2296 | if (in_dev != NULL) |
1da177e4 | 2297 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2298 | /* decrease mem now to avoid the memleak warning */ |
2299 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2300 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2301 | } |
2302 | rtnl_unlock(); | |
2303 | } | |
2304 | ||
dbdd9a52 DM |
2305 | /* called with rcu_read_lock() */ |
2306 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) | |
1da177e4 LT |
2307 | { |
2308 | struct ip_mc_list *im; | |
2309 | struct ip_sf_list *psf; | |
2310 | int rv = 0; | |
2311 | ||
1d7138de | 2312 | for_each_pmc_rcu(in_dev, im) { |
1da177e4 LT |
2313 | if (im->multiaddr == mc_addr) |
2314 | break; | |
2315 | } | |
2316 | if (im && proto == IPPROTO_IGMP) { | |
2317 | rv = 1; | |
2318 | } else if (im) { | |
2319 | if (src_addr) { | |
2320 | for (psf=im->sources; psf; psf=psf->sf_next) { | |
2321 | if (psf->sf_inaddr == src_addr) | |
2322 | break; | |
2323 | } | |
2324 | if (psf) | |
2325 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2326 | psf->sf_count[MCAST_EXCLUDE] != | |
2327 | im->sfcount[MCAST_EXCLUDE]; | |
2328 | else | |
2329 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2330 | } else | |
2331 | rv = 1; /* unspecified source; tentatively allow */ | |
2332 | } | |
1da177e4 LT |
2333 | return rv; |
2334 | } | |
2335 | ||
2336 | #if defined(CONFIG_PROC_FS) | |
2337 | struct igmp_mc_iter_state { | |
7091e728 | 2338 | struct seq_net_private p; |
1da177e4 LT |
2339 | struct net_device *dev; |
2340 | struct in_device *in_dev; | |
2341 | }; | |
2342 | ||
2343 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2344 | ||
2345 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2346 | { | |
7091e728 | 2347 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2348 | struct ip_mc_list *im = NULL; |
2349 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2350 | ||
7562f876 | 2351 | state->in_dev = NULL; |
61fbab77 | 2352 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2353 | struct in_device *in_dev; |
6baff150 ED |
2354 | |
2355 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2356 | if (!in_dev) |
2357 | continue; | |
1d7138de | 2358 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2359 | if (im) { |
2360 | state->in_dev = in_dev; | |
2361 | break; | |
2362 | } | |
1da177e4 LT |
2363 | } |
2364 | return im; | |
2365 | } | |
2366 | ||
2367 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2368 | { | |
2369 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2370 | |
1d7138de ED |
2371 | im = rcu_dereference(im->next_rcu); |
2372 | while (!im) { | |
6baff150 | 2373 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2374 | if (!state->dev) { |
2375 | state->in_dev = NULL; | |
2376 | break; | |
2377 | } | |
6baff150 | 2378 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2379 | if (!state->in_dev) |
2380 | continue; | |
1d7138de | 2381 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2382 | } |
2383 | return im; | |
2384 | } | |
2385 | ||
2386 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2387 | { | |
2388 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2389 | if (im) | |
2390 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2391 | --pos; | |
2392 | return pos ? NULL : im; | |
2393 | } | |
2394 | ||
2395 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2396 | __acquires(rcu) |
1da177e4 | 2397 | { |
61fbab77 | 2398 | rcu_read_lock(); |
1da177e4 LT |
2399 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2400 | } | |
2401 | ||
2402 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2403 | { | |
2404 | struct ip_mc_list *im; | |
2405 | if (v == SEQ_START_TOKEN) | |
2406 | im = igmp_mc_get_first(seq); | |
2407 | else | |
2408 | im = igmp_mc_get_next(seq, v); | |
2409 | ++*pos; | |
2410 | return im; | |
2411 | } | |
2412 | ||
2413 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2414 | __releases(rcu) |
1da177e4 LT |
2415 | { |
2416 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2417 | |
2418 | state->in_dev = NULL; | |
1da177e4 | 2419 | state->dev = NULL; |
61fbab77 | 2420 | rcu_read_unlock(); |
1da177e4 LT |
2421 | } |
2422 | ||
2423 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2424 | { | |
2425 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2426 | seq_puts(seq, |
1da177e4 LT |
2427 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2428 | else { | |
2429 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2430 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2431 | char *querier; | |
2432 | #ifdef CONFIG_IP_MULTICAST | |
2433 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2434 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2435 | "V3"; | |
2436 | #else | |
2437 | querier = "NONE"; | |
2438 | #endif | |
2439 | ||
1d7138de | 2440 | if (rcu_dereference(state->in_dev->mc_list) == im) { |
1da177e4 | 2441 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2442 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2443 | } |
2444 | ||
2445 | seq_printf(seq, | |
338fcf98 | 2446 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 LT |
2447 | im->multiaddr, im->users, |
2448 | im->tm_running, im->tm_running ? | |
2449 | jiffies_to_clock_t(im->timer.expires-jiffies) : 0, | |
2450 | im->reporter); | |
2451 | } | |
2452 | return 0; | |
2453 | } | |
2454 | ||
f690808e | 2455 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2456 | .start = igmp_mc_seq_start, |
2457 | .next = igmp_mc_seq_next, | |
2458 | .stop = igmp_mc_seq_stop, | |
2459 | .show = igmp_mc_seq_show, | |
2460 | }; | |
2461 | ||
2462 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2463 | { | |
7091e728 | 2464 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2465 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2466 | } |
2467 | ||
9a32144e | 2468 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2469 | .owner = THIS_MODULE, |
2470 | .open = igmp_mc_seq_open, | |
2471 | .read = seq_read, | |
2472 | .llseek = seq_lseek, | |
7091e728 | 2473 | .release = seq_release_net, |
1da177e4 LT |
2474 | }; |
2475 | ||
2476 | struct igmp_mcf_iter_state { | |
7091e728 | 2477 | struct seq_net_private p; |
1da177e4 LT |
2478 | struct net_device *dev; |
2479 | struct in_device *idev; | |
2480 | struct ip_mc_list *im; | |
2481 | }; | |
2482 | ||
2483 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2484 | ||
2485 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2486 | { | |
7091e728 | 2487 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2488 | struct ip_sf_list *psf = NULL; |
2489 | struct ip_mc_list *im = NULL; | |
2490 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2491 | ||
7562f876 PE |
2492 | state->idev = NULL; |
2493 | state->im = NULL; | |
61fbab77 | 2494 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2495 | struct in_device *idev; |
6baff150 | 2496 | idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2497 | if (unlikely(idev == NULL)) |
2498 | continue; | |
1d7138de | 2499 | im = rcu_dereference(idev->mc_list); |
1da177e4 LT |
2500 | if (likely(im != NULL)) { |
2501 | spin_lock_bh(&im->lock); | |
2502 | psf = im->sources; | |
2503 | if (likely(psf != NULL)) { | |
2504 | state->im = im; | |
2505 | state->idev = idev; | |
2506 | break; | |
2507 | } | |
2508 | spin_unlock_bh(&im->lock); | |
2509 | } | |
1da177e4 LT |
2510 | } |
2511 | return psf; | |
2512 | } | |
2513 | ||
2514 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2515 | { | |
2516 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2517 | ||
2518 | psf = psf->sf_next; | |
2519 | while (!psf) { | |
2520 | spin_unlock_bh(&state->im->lock); | |
2521 | state->im = state->im->next; | |
2522 | while (!state->im) { | |
6baff150 | 2523 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2524 | if (!state->dev) { |
2525 | state->idev = NULL; | |
2526 | goto out; | |
2527 | } | |
6baff150 | 2528 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2529 | if (!state->idev) |
2530 | continue; | |
1d7138de | 2531 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2532 | } |
2533 | if (!state->im) | |
2534 | break; | |
2535 | spin_lock_bh(&state->im->lock); | |
2536 | psf = state->im->sources; | |
2537 | } | |
2538 | out: | |
2539 | return psf; | |
2540 | } | |
2541 | ||
2542 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2543 | { | |
2544 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2545 | if (psf) | |
2546 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2547 | --pos; | |
2548 | return pos ? NULL : psf; | |
2549 | } | |
2550 | ||
2551 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2552 | __acquires(rcu) |
1da177e4 | 2553 | { |
61fbab77 | 2554 | rcu_read_lock(); |
1da177e4 LT |
2555 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2556 | } | |
2557 | ||
2558 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2559 | { | |
2560 | struct ip_sf_list *psf; | |
2561 | if (v == SEQ_START_TOKEN) | |
2562 | psf = igmp_mcf_get_first(seq); | |
2563 | else | |
2564 | psf = igmp_mcf_get_next(seq, v); | |
2565 | ++*pos; | |
2566 | return psf; | |
2567 | } | |
2568 | ||
2569 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2570 | __releases(rcu) |
1da177e4 LT |
2571 | { |
2572 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2573 | if (likely(state->im != NULL)) { | |
2574 | spin_unlock_bh(&state->im->lock); | |
2575 | state->im = NULL; | |
2576 | } | |
1d7138de | 2577 | state->idev = NULL; |
1da177e4 | 2578 | state->dev = NULL; |
61fbab77 | 2579 | rcu_read_unlock(); |
1da177e4 LT |
2580 | } |
2581 | ||
2582 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2583 | { | |
2584 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2585 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2586 | ||
2587 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2588 | seq_printf(seq, |
1da177e4 LT |
2589 | "%3s %6s " |
2590 | "%10s %10s %6s %6s\n", "Idx", | |
2591 | "Device", "MCA", | |
2592 | "SRC", "INC", "EXC"); | |
2593 | } else { | |
2594 | seq_printf(seq, | |
2595 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2596 | "0x%08x %6lu %6lu\n", |
2597 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2598 | ntohl(state->im->multiaddr), |
2599 | ntohl(psf->sf_inaddr), | |
2600 | psf->sf_count[MCAST_INCLUDE], | |
2601 | psf->sf_count[MCAST_EXCLUDE]); | |
2602 | } | |
2603 | return 0; | |
2604 | } | |
2605 | ||
f690808e | 2606 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2607 | .start = igmp_mcf_seq_start, |
2608 | .next = igmp_mcf_seq_next, | |
2609 | .stop = igmp_mcf_seq_stop, | |
2610 | .show = igmp_mcf_seq_show, | |
2611 | }; | |
2612 | ||
2613 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2614 | { | |
7091e728 | 2615 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2616 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2617 | } |
2618 | ||
9a32144e | 2619 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2620 | .owner = THIS_MODULE, |
2621 | .open = igmp_mcf_seq_open, | |
2622 | .read = seq_read, | |
2623 | .llseek = seq_lseek, | |
7091e728 | 2624 | .release = seq_release_net, |
1da177e4 LT |
2625 | }; |
2626 | ||
2c8c1e72 | 2627 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2628 | { |
7091e728 AD |
2629 | struct proc_dir_entry *pde; |
2630 | ||
2631 | pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); | |
2632 | if (!pde) | |
2633 | goto out_igmp; | |
2634 | pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); | |
2635 | if (!pde) | |
2636 | goto out_mcfilter; | |
1da177e4 | 2637 | return 0; |
7091e728 AD |
2638 | |
2639 | out_mcfilter: | |
2640 | proc_net_remove(net, "igmp"); | |
2641 | out_igmp: | |
2642 | return -ENOMEM; | |
2643 | } | |
2644 | ||
2c8c1e72 | 2645 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 AD |
2646 | { |
2647 | proc_net_remove(net, "mcfilter"); | |
2648 | proc_net_remove(net, "igmp"); | |
2649 | } | |
2650 | ||
2651 | static struct pernet_operations igmp_net_ops = { | |
2652 | .init = igmp_net_init, | |
2653 | .exit = igmp_net_exit, | |
2654 | }; | |
2655 | ||
2656 | int __init igmp_mc_proc_init(void) | |
2657 | { | |
2658 | return register_pernet_subsys(&igmp_net_ops); | |
1da177e4 LT |
2659 | } |
2660 | #endif |