Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
1da177e4 LT |
75 | #include <asm/uaccess.h> |
76 | #include <asm/system.h> | |
77 | #include <linux/types.h> | |
78 | #include <linux/kernel.h> | |
79 | #include <linux/jiffies.h> | |
80 | #include <linux/string.h> | |
81 | #include <linux/socket.h> | |
82 | #include <linux/sockios.h> | |
83 | #include <linux/in.h> | |
84 | #include <linux/inet.h> | |
85 | #include <linux/netdevice.h> | |
86 | #include <linux/skbuff.h> | |
87 | #include <linux/inetdevice.h> | |
88 | #include <linux/igmp.h> | |
89 | #include <linux/if_arp.h> | |
90 | #include <linux/rtnetlink.h> | |
91 | #include <linux/times.h> | |
14c85021 | 92 | |
457c4cbc | 93 | #include <net/net_namespace.h> |
14c85021 | 94 | #include <net/arp.h> |
1da177e4 LT |
95 | #include <net/ip.h> |
96 | #include <net/protocol.h> | |
97 | #include <net/route.h> | |
98 | #include <net/sock.h> | |
99 | #include <net/checksum.h> | |
100 | #include <linux/netfilter_ipv4.h> | |
101 | #ifdef CONFIG_IP_MROUTE | |
102 | #include <linux/mroute.h> | |
103 | #endif | |
104 | #ifdef CONFIG_PROC_FS | |
105 | #include <linux/proc_fs.h> | |
106 | #include <linux/seq_file.h> | |
107 | #endif | |
108 | ||
109 | #define IP_MAX_MEMBERSHIPS 20 | |
110 | #define IP_MAX_MSF 10 | |
111 | ||
112 | #ifdef CONFIG_IP_MULTICAST | |
113 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
114 | ||
115 | #define IGMP_V1_Router_Present_Timeout (400*HZ) | |
116 | #define IGMP_V2_Router_Present_Timeout (400*HZ) | |
117 | #define IGMP_Unsolicited_Report_Interval (10*HZ) | |
118 | #define IGMP_Query_Response_Interval (10*HZ) | |
119 | #define IGMP_Unsolicited_Report_Count 2 | |
120 | ||
121 | ||
122 | #define IGMP_Initial_Report_Delay (1) | |
123 | ||
124 | /* IGMP_Initial_Report_Delay is not from IGMP specs! | |
125 | * IGMP specs require to report membership immediately after | |
126 | * joining a group, but we delay the first report by a | |
127 | * small interval. It seems more natural and still does not | |
128 | * contradict to specs provided this delay is small enough. | |
129 | */ | |
130 | ||
42f811b8 | 131 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 132 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
133 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
134 | ((in_dev)->mr_v1_seen && \ | |
135 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
136 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 137 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
138 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
139 | ((in_dev)->mr_v2_seen && \ | |
140 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 LT |
141 | |
142 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); | |
63007727 | 143 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); |
1da177e4 LT |
144 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
145 | static int sf_setstate(struct ip_mc_list *pmc); | |
146 | static void sf_markstate(struct ip_mc_list *pmc); | |
147 | #endif | |
148 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
149 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
150 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 | 151 | |
1d7138de ED |
152 | |
153 | static void ip_mc_list_reclaim(struct rcu_head *head) | |
154 | { | |
155 | kfree(container_of(head, struct ip_mc_list, rcu)); | |
156 | } | |
157 | ||
1da177e4 LT |
158 | static void ip_ma_put(struct ip_mc_list *im) |
159 | { | |
160 | if (atomic_dec_and_test(&im->refcnt)) { | |
161 | in_dev_put(im->interface); | |
1d7138de | 162 | call_rcu(&im->rcu, ip_mc_list_reclaim); |
1da177e4 LT |
163 | } |
164 | } | |
165 | ||
d9aa9380 DM |
166 | #define for_each_pmc_rcu(in_dev, pmc) \ |
167 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
168 | pmc != NULL; \ | |
169 | pmc = rcu_dereference(pmc->next_rcu)) | |
170 | ||
171 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
172 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
173 | pmc != NULL; \ | |
174 | pmc = rtnl_dereference(pmc->next_rcu)) | |
175 | ||
1da177e4 LT |
176 | #ifdef CONFIG_IP_MULTICAST |
177 | ||
178 | /* | |
179 | * Timer management | |
180 | */ | |
181 | ||
1d7138de | 182 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
183 | { |
184 | spin_lock_bh(&im->lock); | |
185 | if (del_timer(&im->timer)) | |
186 | atomic_dec(&im->refcnt); | |
a7e9ff73 | 187 | im->tm_running = 0; |
1da177e4 LT |
188 | im->reporter = 0; |
189 | im->unsolicit_count = 0; | |
190 | spin_unlock_bh(&im->lock); | |
191 | } | |
192 | ||
193 | /* It must be called with locked im->lock */ | |
194 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
195 | { | |
a7e9ff73 | 196 | int tv = net_random() % max_delay; |
1da177e4 | 197 | |
a7e9ff73 | 198 | im->tm_running = 1; |
1da177e4 LT |
199 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
200 | atomic_inc(&im->refcnt); | |
201 | } | |
202 | ||
203 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
204 | { | |
205 | int tv = net_random() % in_dev->mr_maxdelay; | |
206 | ||
207 | in_dev->mr_gq_running = 1; | |
208 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
209 | in_dev_hold(in_dev); | |
210 | } | |
211 | ||
212 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
213 | { | |
214 | int tv = net_random() % delay; | |
215 | ||
216 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
217 | in_dev_hold(in_dev); | |
218 | } | |
219 | ||
220 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
221 | { | |
222 | spin_lock_bh(&im->lock); | |
223 | im->unsolicit_count = 0; | |
224 | if (del_timer(&im->timer)) { | |
225 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
226 | add_timer(&im->timer); | |
a7e9ff73 | 227 | im->tm_running = 1; |
1da177e4 LT |
228 | spin_unlock_bh(&im->lock); |
229 | return; | |
230 | } | |
231 | atomic_dec(&im->refcnt); | |
232 | } | |
233 | igmp_start_timer(im, max_delay); | |
234 | spin_unlock_bh(&im->lock); | |
235 | } | |
236 | ||
237 | ||
238 | /* | |
239 | * Send an IGMP report. | |
240 | */ | |
241 | ||
242 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
243 | ||
244 | ||
245 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
246 | int gdeleted, int sdeleted) | |
247 | { | |
248 | switch (type) { | |
249 | case IGMPV3_MODE_IS_INCLUDE: | |
250 | case IGMPV3_MODE_IS_EXCLUDE: | |
251 | if (gdeleted || sdeleted) | |
252 | return 0; | |
ad12583f DS |
253 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
254 | if (pmc->sfmode == MCAST_INCLUDE) | |
255 | return 1; | |
256 | /* don't include if this source is excluded | |
257 | * in all filters | |
258 | */ | |
259 | if (psf->sf_count[MCAST_INCLUDE]) | |
260 | return type == IGMPV3_MODE_IS_INCLUDE; | |
261 | return pmc->sfcount[MCAST_EXCLUDE] == | |
262 | psf->sf_count[MCAST_EXCLUDE]; | |
263 | } | |
264 | return 0; | |
1da177e4 LT |
265 | case IGMPV3_CHANGE_TO_INCLUDE: |
266 | if (gdeleted || sdeleted) | |
267 | return 0; | |
268 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
269 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
270 | if (gdeleted || sdeleted) | |
271 | return 0; | |
272 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
273 | psf->sf_count[MCAST_INCLUDE]) | |
274 | return 0; | |
275 | return pmc->sfcount[MCAST_EXCLUDE] == | |
276 | psf->sf_count[MCAST_EXCLUDE]; | |
277 | case IGMPV3_ALLOW_NEW_SOURCES: | |
278 | if (gdeleted || !psf->sf_crcount) | |
279 | return 0; | |
280 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
281 | case IGMPV3_BLOCK_OLD_SOURCES: | |
282 | if (pmc->sfmode == MCAST_INCLUDE) | |
283 | return gdeleted || (psf->sf_crcount && sdeleted); | |
284 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
285 | } | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static int | |
290 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
291 | { | |
292 | struct ip_sf_list *psf; | |
293 | int scount = 0; | |
294 | ||
295 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
296 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) | |
297 | continue; | |
298 | scount++; | |
299 | } | |
300 | return scount; | |
301 | } | |
302 | ||
57e1ab6e ED |
303 | #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb)) |
304 | ||
1da177e4 LT |
305 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) |
306 | { | |
307 | struct sk_buff *skb; | |
308 | struct rtable *rt; | |
309 | struct iphdr *pip; | |
310 | struct igmpv3_report *pig; | |
877acedc | 311 | struct net *net = dev_net(dev); |
1da177e4 | 312 | |
57e1ab6e ED |
313 | while (1) { |
314 | skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), | |
315 | GFP_ATOMIC | __GFP_NOWARN); | |
316 | if (skb) | |
317 | break; | |
318 | size >>= 1; | |
319 | if (size < 256) | |
320 | return NULL; | |
321 | } | |
322 | igmp_skb_size(skb) = size; | |
1da177e4 | 323 | |
78fbfd8a DM |
324 | rt = ip_route_output_ports(net, NULL, IGMPV3_ALL_MCR, 0, |
325 | 0, 0, | |
326 | IPPROTO_IGMP, 0, dev->ifindex); | |
327 | if (IS_ERR(rt)) { | |
328 | kfree_skb(skb); | |
329 | return NULL; | |
1da177e4 | 330 | } |
1da177e4 | 331 | |
d8d1f30b | 332 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
333 | skb->dev = dev; |
334 | ||
335 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
336 | ||
7e28ecc2 | 337 | skb_reset_network_header(skb); |
eddc9ec5 | 338 | pip = ip_hdr(skb); |
7e28ecc2 | 339 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
340 | |
341 | pip->version = 4; | |
342 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
343 | pip->tos = 0xc0; | |
344 | pip->frag_off = htons(IP_DF); | |
345 | pip->ttl = 1; | |
346 | pip->daddr = rt->rt_dst; | |
347 | pip->saddr = rt->rt_src; | |
348 | pip->protocol = IPPROTO_IGMP; | |
349 | pip->tot_len = 0; /* filled in later */ | |
d8d1f30b | 350 | ip_select_ident(pip, &rt->dst, NULL); |
1da177e4 LT |
351 | ((u8*)&pip[1])[0] = IPOPT_RA; |
352 | ((u8*)&pip[1])[1] = 4; | |
353 | ((u8*)&pip[1])[2] = 0; | |
354 | ((u8*)&pip[1])[3] = 0; | |
355 | ||
b0e380b1 | 356 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 357 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 358 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
359 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
360 | pig->resv1 = 0; | |
361 | pig->csum = 0; | |
362 | pig->resv2 = 0; | |
363 | pig->ngrec = 0; | |
364 | return skb; | |
365 | } | |
366 | ||
367 | static int igmpv3_sendpack(struct sk_buff *skb) | |
368 | { | |
d9edf9e2 | 369 | struct igmphdr *pig = igmp_hdr(skb); |
27a884dc | 370 | const int igmplen = skb->tail - skb->transport_header; |
1da177e4 | 371 | |
d9edf9e2 | 372 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 373 | |
c439cb2e | 374 | return ip_local_out(skb); |
1da177e4 LT |
375 | } |
376 | ||
377 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
378 | { | |
a7e9ff73 | 379 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
380 | } |
381 | ||
382 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
383 | int type, struct igmpv3_grec **ppgr) | |
384 | { | |
385 | struct net_device *dev = pmc->interface->dev; | |
386 | struct igmpv3_report *pih; | |
387 | struct igmpv3_grec *pgr; | |
388 | ||
389 | if (!skb) | |
390 | skb = igmpv3_newpack(dev, dev->mtu); | |
391 | if (!skb) | |
392 | return NULL; | |
393 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
394 | pgr->grec_type = type; | |
395 | pgr->grec_auxwords = 0; | |
396 | pgr->grec_nsrcs = 0; | |
397 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 398 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
399 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
400 | *ppgr = pgr; | |
401 | return skb; | |
402 | } | |
403 | ||
57e1ab6e | 404 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \ |
1da177e4 LT |
405 | skb_tailroom(skb)) : 0) |
406 | ||
407 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
408 | int type, int gdeleted, int sdeleted) | |
409 | { | |
410 | struct net_device *dev = pmc->interface->dev; | |
411 | struct igmpv3_report *pih; | |
412 | struct igmpv3_grec *pgr = NULL; | |
413 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 414 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
415 | |
416 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
417 | return skb; | |
418 | ||
419 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
420 | type == IGMPV3_MODE_IS_EXCLUDE; | |
421 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
422 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
423 | ||
ad12583f DS |
424 | stotal = scount = 0; |
425 | ||
1da177e4 LT |
426 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
427 | ||
ad12583f DS |
428 | if (!*psf_list) |
429 | goto empty_source; | |
430 | ||
d9edf9e2 | 431 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
432 | |
433 | /* EX and TO_EX get a fresh packet, if needed */ | |
434 | if (truncate) { | |
435 | if (pih && pih->ngrec && | |
436 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
437 | if (skb) | |
438 | igmpv3_sendpack(skb); | |
439 | skb = igmpv3_newpack(dev, dev->mtu); | |
440 | } | |
441 | } | |
442 | first = 1; | |
1da177e4 LT |
443 | psf_prev = NULL; |
444 | for (psf=*psf_list; psf; psf=psf_next) { | |
ea4d9e72 | 445 | __be32 *psrc; |
1da177e4 LT |
446 | |
447 | psf_next = psf->sf_next; | |
448 | ||
449 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
450 | psf_prev = psf; | |
451 | continue; | |
452 | } | |
453 | ||
454 | /* clear marks on query responses */ | |
455 | if (isquery) | |
456 | psf->sf_gsresp = 0; | |
457 | ||
63007727 | 458 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
459 | first*sizeof(struct igmpv3_grec)) { |
460 | if (truncate && !first) | |
461 | break; /* truncate these */ | |
462 | if (pgr) | |
463 | pgr->grec_nsrcs = htons(scount); | |
464 | if (skb) | |
465 | igmpv3_sendpack(skb); | |
466 | skb = igmpv3_newpack(dev, dev->mtu); | |
467 | first = 1; | |
468 | scount = 0; | |
469 | } | |
470 | if (first) { | |
471 | skb = add_grhead(skb, pmc, type, &pgr); | |
472 | first = 0; | |
473 | } | |
cc63f70b AD |
474 | if (!skb) |
475 | return NULL; | |
63007727 | 476 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 477 | *psrc = psf->sf_inaddr; |
ad12583f | 478 | scount++; stotal++; |
1da177e4 LT |
479 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
480 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
481 | psf->sf_crcount--; | |
482 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
483 | if (psf_prev) | |
484 | psf_prev->sf_next = psf->sf_next; | |
485 | else | |
486 | *psf_list = psf->sf_next; | |
487 | kfree(psf); | |
488 | continue; | |
489 | } | |
490 | } | |
491 | psf_prev = psf; | |
492 | } | |
ad12583f DS |
493 | |
494 | empty_source: | |
495 | if (!stotal) { | |
496 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
497 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
498 | return skb; | |
499 | if (pmc->crcount || isquery) { | |
500 | /* make sure we have room for group header */ | |
501 | if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { | |
502 | igmpv3_sendpack(skb); | |
503 | skb = NULL; /* add_grhead will get a new one */ | |
504 | } | |
505 | skb = add_grhead(skb, pmc, type, &pgr); | |
506 | } | |
507 | } | |
1da177e4 LT |
508 | if (pgr) |
509 | pgr->grec_nsrcs = htons(scount); | |
510 | ||
511 | if (isquery) | |
512 | pmc->gsquery = 0; /* clear query state on report */ | |
513 | return skb; | |
514 | } | |
515 | ||
516 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
517 | { | |
518 | struct sk_buff *skb = NULL; | |
519 | int type; | |
520 | ||
521 | if (!pmc) { | |
1d7138de ED |
522 | rcu_read_lock(); |
523 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
524 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
525 | continue; | |
526 | spin_lock_bh(&pmc->lock); | |
527 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
528 | type = IGMPV3_MODE_IS_EXCLUDE; | |
529 | else | |
530 | type = IGMPV3_MODE_IS_INCLUDE; | |
531 | skb = add_grec(skb, pmc, type, 0, 0); | |
532 | spin_unlock_bh(&pmc->lock); | |
533 | } | |
1d7138de | 534 | rcu_read_unlock(); |
1da177e4 LT |
535 | } else { |
536 | spin_lock_bh(&pmc->lock); | |
537 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
538 | type = IGMPV3_MODE_IS_EXCLUDE; | |
539 | else | |
540 | type = IGMPV3_MODE_IS_INCLUDE; | |
541 | skb = add_grec(skb, pmc, type, 0, 0); | |
542 | spin_unlock_bh(&pmc->lock); | |
543 | } | |
544 | if (!skb) | |
545 | return 0; | |
546 | return igmpv3_sendpack(skb); | |
547 | } | |
548 | ||
549 | /* | |
550 | * remove zero-count source records from a source filter list | |
551 | */ | |
552 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
553 | { | |
554 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
555 | ||
556 | psf_prev = NULL; | |
557 | for (psf=*ppsf; psf; psf = psf_next) { | |
558 | psf_next = psf->sf_next; | |
559 | if (psf->sf_crcount == 0) { | |
560 | if (psf_prev) | |
561 | psf_prev->sf_next = psf->sf_next; | |
562 | else | |
563 | *ppsf = psf->sf_next; | |
564 | kfree(psf); | |
565 | } else | |
566 | psf_prev = psf; | |
567 | } | |
568 | } | |
569 | ||
570 | static void igmpv3_send_cr(struct in_device *in_dev) | |
571 | { | |
572 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
573 | struct sk_buff *skb = NULL; | |
574 | int type, dtype; | |
575 | ||
1d7138de | 576 | rcu_read_lock(); |
1da177e4 LT |
577 | spin_lock_bh(&in_dev->mc_tomb_lock); |
578 | ||
579 | /* deleted MCA's */ | |
580 | pmc_prev = NULL; | |
581 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { | |
582 | pmc_next = pmc->next; | |
583 | if (pmc->sfmode == MCAST_INCLUDE) { | |
584 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
585 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
586 | skb = add_grec(skb, pmc, type, 1, 0); | |
587 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
588 | } | |
589 | if (pmc->crcount) { | |
1da177e4 LT |
590 | if (pmc->sfmode == MCAST_EXCLUDE) { |
591 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
592 | skb = add_grec(skb, pmc, type, 1, 0); | |
593 | } | |
ad12583f | 594 | pmc->crcount--; |
1da177e4 LT |
595 | if (pmc->crcount == 0) { |
596 | igmpv3_clear_zeros(&pmc->tomb); | |
597 | igmpv3_clear_zeros(&pmc->sources); | |
598 | } | |
599 | } | |
600 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
601 | if (pmc_prev) | |
602 | pmc_prev->next = pmc_next; | |
603 | else | |
604 | in_dev->mc_tomb = pmc_next; | |
605 | in_dev_put(pmc->interface); | |
606 | kfree(pmc); | |
607 | } else | |
608 | pmc_prev = pmc; | |
609 | } | |
610 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
611 | ||
612 | /* change recs */ | |
1d7138de | 613 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
614 | spin_lock_bh(&pmc->lock); |
615 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
616 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
617 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
618 | } else { | |
619 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
620 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
621 | } | |
622 | skb = add_grec(skb, pmc, type, 0, 0); | |
623 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
624 | ||
625 | /* filter mode changes */ | |
626 | if (pmc->crcount) { | |
1da177e4 LT |
627 | if (pmc->sfmode == MCAST_EXCLUDE) |
628 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
629 | else | |
630 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
631 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 632 | pmc->crcount--; |
1da177e4 LT |
633 | } |
634 | spin_unlock_bh(&pmc->lock); | |
635 | } | |
1d7138de | 636 | rcu_read_unlock(); |
1da177e4 LT |
637 | |
638 | if (!skb) | |
639 | return; | |
640 | (void) igmpv3_sendpack(skb); | |
641 | } | |
642 | ||
643 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
644 | int type) | |
645 | { | |
646 | struct sk_buff *skb; | |
647 | struct iphdr *iph; | |
648 | struct igmphdr *ih; | |
649 | struct rtable *rt; | |
650 | struct net_device *dev = in_dev->dev; | |
877acedc | 651 | struct net *net = dev_net(dev); |
63007727 AV |
652 | __be32 group = pmc ? pmc->multiaddr : 0; |
653 | __be32 dst; | |
1da177e4 LT |
654 | |
655 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
656 | return igmpv3_send_report(in_dev, pmc); | |
657 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
658 | dst = IGMP_ALL_ROUTER; | |
659 | else | |
660 | dst = group; | |
661 | ||
78fbfd8a DM |
662 | rt = ip_route_output_ports(net, NULL, dst, 0, |
663 | 0, 0, | |
664 | IPPROTO_IGMP, 0, dev->ifindex); | |
665 | if (IS_ERR(rt)) | |
666 | return -1; | |
667 | ||
a7e9ff73 | 668 | skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); |
1da177e4 LT |
669 | if (skb == NULL) { |
670 | ip_rt_put(rt); | |
671 | return -1; | |
672 | } | |
673 | ||
d8d1f30b | 674 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
675 | |
676 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
677 | ||
7e28ecc2 | 678 | skb_reset_network_header(skb); |
eddc9ec5 | 679 | iph = ip_hdr(skb); |
7e28ecc2 | 680 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
681 | |
682 | iph->version = 4; | |
683 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
684 | iph->tos = 0xc0; | |
685 | iph->frag_off = htons(IP_DF); | |
686 | iph->ttl = 1; | |
687 | iph->daddr = dst; | |
688 | iph->saddr = rt->rt_src; | |
689 | iph->protocol = IPPROTO_IGMP; | |
d8d1f30b | 690 | ip_select_ident(iph, &rt->dst, NULL); |
1da177e4 LT |
691 | ((u8*)&iph[1])[0] = IPOPT_RA; |
692 | ((u8*)&iph[1])[1] = 4; | |
693 | ((u8*)&iph[1])[2] = 0; | |
694 | ((u8*)&iph[1])[3] = 0; | |
1da177e4 LT |
695 | |
696 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
697 | ih->type = type; |
698 | ih->code = 0; | |
699 | ih->csum = 0; | |
700 | ih->group = group; | |
701 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 702 | |
c439cb2e | 703 | return ip_local_out(skb); |
1da177e4 LT |
704 | } |
705 | ||
706 | static void igmp_gq_timer_expire(unsigned long data) | |
707 | { | |
708 | struct in_device *in_dev = (struct in_device *)data; | |
709 | ||
710 | in_dev->mr_gq_running = 0; | |
711 | igmpv3_send_report(in_dev, NULL); | |
712 | __in_dev_put(in_dev); | |
713 | } | |
714 | ||
715 | static void igmp_ifc_timer_expire(unsigned long data) | |
716 | { | |
717 | struct in_device *in_dev = (struct in_device *)data; | |
718 | ||
719 | igmpv3_send_cr(in_dev); | |
720 | if (in_dev->mr_ifc_count) { | |
721 | in_dev->mr_ifc_count--; | |
722 | igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); | |
723 | } | |
724 | __in_dev_put(in_dev); | |
725 | } | |
726 | ||
727 | static void igmp_ifc_event(struct in_device *in_dev) | |
728 | { | |
729 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
730 | return; | |
e905a9ed | 731 | in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
732 | IGMP_Unsolicited_Report_Count; |
733 | igmp_ifc_start_timer(in_dev, 1); | |
734 | } | |
735 | ||
736 | ||
737 | static void igmp_timer_expire(unsigned long data) | |
738 | { | |
739 | struct ip_mc_list *im=(struct ip_mc_list *)data; | |
740 | struct in_device *in_dev = im->interface; | |
741 | ||
742 | spin_lock(&im->lock); | |
a7e9ff73 | 743 | im->tm_running = 0; |
1da177e4 LT |
744 | |
745 | if (im->unsolicit_count) { | |
746 | im->unsolicit_count--; | |
747 | igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); | |
748 | } | |
749 | im->reporter = 1; | |
750 | spin_unlock(&im->lock); | |
751 | ||
752 | if (IGMP_V1_SEEN(in_dev)) | |
753 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
754 | else if (IGMP_V2_SEEN(in_dev)) | |
755 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
756 | else | |
757 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
758 | ||
759 | ip_ma_put(im); | |
760 | } | |
761 | ||
ad12583f | 762 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 763 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
764 | { |
765 | struct ip_sf_list *psf; | |
766 | int i, scount; | |
767 | ||
ad12583f DS |
768 | scount = 0; |
769 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
770 | if (scount == nsrcs) | |
771 | break; | |
772 | for (i=0; i<nsrcs; i++) { | |
773 | /* skip inactive filters */ | |
774 | if (pmc->sfcount[MCAST_INCLUDE] || | |
775 | pmc->sfcount[MCAST_EXCLUDE] != | |
776 | psf->sf_count[MCAST_EXCLUDE]) | |
777 | continue; | |
778 | if (srcs[i] == psf->sf_inaddr) { | |
779 | scount++; | |
780 | break; | |
781 | } | |
782 | } | |
783 | } | |
784 | pmc->gsquery = 0; | |
785 | if (scount == nsrcs) /* all sources excluded */ | |
786 | return 0; | |
787 | return 1; | |
788 | } | |
789 | ||
ea4d9e72 | 790 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
791 | { |
792 | struct ip_sf_list *psf; | |
793 | int i, scount; | |
794 | ||
795 | if (pmc->sfmode == MCAST_EXCLUDE) | |
796 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
797 | ||
798 | /* mark INCLUDE-mode sources */ | |
1da177e4 LT |
799 | scount = 0; |
800 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
801 | if (scount == nsrcs) | |
802 | break; | |
803 | for (i=0; i<nsrcs; i++) | |
804 | if (srcs[i] == psf->sf_inaddr) { | |
805 | psf->sf_gsresp = 1; | |
806 | scount++; | |
807 | break; | |
808 | } | |
809 | } | |
ad12583f DS |
810 | if (!scount) { |
811 | pmc->gsquery = 0; | |
812 | return 0; | |
813 | } | |
814 | pmc->gsquery = 1; | |
815 | return 1; | |
1da177e4 LT |
816 | } |
817 | ||
63007727 | 818 | static void igmp_heard_report(struct in_device *in_dev, __be32 group) |
1da177e4 LT |
819 | { |
820 | struct ip_mc_list *im; | |
821 | ||
822 | /* Timers are only set for non-local groups */ | |
823 | ||
824 | if (group == IGMP_ALL_HOSTS) | |
825 | return; | |
826 | ||
1d7138de ED |
827 | rcu_read_lock(); |
828 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
829 | if (im->multiaddr == group) { |
830 | igmp_stop_timer(im); | |
831 | break; | |
832 | } | |
833 | } | |
1d7138de | 834 | rcu_read_unlock(); |
1da177e4 LT |
835 | } |
836 | ||
837 | static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
838 | int len) | |
839 | { | |
d9edf9e2 ACM |
840 | struct igmphdr *ih = igmp_hdr(skb); |
841 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 842 | struct ip_mc_list *im; |
63007727 | 843 | __be32 group = ih->group; |
1da177e4 LT |
844 | int max_delay; |
845 | int mark = 0; | |
846 | ||
847 | ||
5b7c8406 | 848 | if (len == 8) { |
1da177e4 LT |
849 | if (ih->code == 0) { |
850 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 851 | |
1da177e4 LT |
852 | max_delay = IGMP_Query_Response_Interval; |
853 | in_dev->mr_v1_seen = jiffies + | |
854 | IGMP_V1_Router_Present_Timeout; | |
855 | group = 0; | |
856 | } else { | |
857 | /* v2 router present */ | |
858 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
859 | in_dev->mr_v2_seen = jiffies + | |
860 | IGMP_V2_Router_Present_Timeout; | |
861 | } | |
862 | /* cancel the interface change timer */ | |
863 | in_dev->mr_ifc_count = 0; | |
864 | if (del_timer(&in_dev->mr_ifc_timer)) | |
865 | __in_dev_put(in_dev); | |
866 | /* clear deleted report items */ | |
867 | igmpv3_clear_delrec(in_dev); | |
868 | } else if (len < 12) { | |
869 | return; /* ignore bogus packet; freed by caller */ | |
5b7c8406 DS |
870 | } else if (IGMP_V1_SEEN(in_dev)) { |
871 | /* This is a v3 query with v1 queriers present */ | |
872 | max_delay = IGMP_Query_Response_Interval; | |
873 | group = 0; | |
874 | } else if (IGMP_V2_SEEN(in_dev)) { | |
875 | /* this is a v3 query with v2 queriers present; | |
876 | * Interpretation of the max_delay code is problematic here. | |
877 | * A real v2 host would use ih_code directly, while v3 has a | |
878 | * different encoding. We use the v3 encoding as more likely | |
879 | * to be intended in a v3 query. | |
880 | */ | |
881 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
1da177e4 LT |
882 | } else { /* v3 */ |
883 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
884 | return; | |
e905a9ed | 885 | |
d9edf9e2 | 886 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 887 | if (ih3->nsrcs) { |
e905a9ed | 888 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 889 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
1da177e4 | 890 | return; |
d9edf9e2 | 891 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
892 | } |
893 | ||
894 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
895 | if (!max_delay) | |
896 | max_delay = 1; /* can't mod w/ 0 */ | |
897 | in_dev->mr_maxdelay = max_delay; | |
898 | if (ih3->qrv) | |
899 | in_dev->mr_qrv = ih3->qrv; | |
900 | if (!group) { /* general query */ | |
901 | if (ih3->nsrcs) | |
902 | return; /* no sources allowed */ | |
903 | igmp_gq_start_timer(in_dev); | |
904 | return; | |
905 | } | |
906 | /* mark sources to include, if group & source-specific */ | |
907 | mark = ih3->nsrcs != 0; | |
908 | } | |
909 | ||
910 | /* | |
911 | * - Start the timers in all of our membership records | |
912 | * that the query applies to for the interface on | |
913 | * which the query arrived excl. those that belong | |
914 | * to a "local" group (224.0.0.X) | |
915 | * - For timers already running check if they need to | |
916 | * be reset. | |
917 | * - Use the igmp->igmp_code field as the maximum | |
918 | * delay possible | |
919 | */ | |
1d7138de ED |
920 | rcu_read_lock(); |
921 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
922 | int changed; |
923 | ||
1da177e4 LT |
924 | if (group && group != im->multiaddr) |
925 | continue; | |
926 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
927 | continue; | |
928 | spin_lock_bh(&im->lock); | |
929 | if (im->tm_running) | |
930 | im->gsquery = im->gsquery && mark; | |
931 | else | |
932 | im->gsquery = mark; | |
ad12583f | 933 | changed = !im->gsquery || |
e905a9ed | 934 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 935 | spin_unlock_bh(&im->lock); |
ad12583f DS |
936 | if (changed) |
937 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 938 | } |
1d7138de | 939 | rcu_read_unlock(); |
1da177e4 LT |
940 | } |
941 | ||
9a57a9d2 | 942 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
943 | int igmp_rcv(struct sk_buff *skb) |
944 | { | |
945 | /* This basically follows the spec line by line -- see RFC1112 */ | |
946 | struct igmphdr *ih; | |
9a57a9d2 | 947 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 LT |
948 | int len = skb->len; |
949 | ||
cd557bc1 DL |
950 | if (in_dev == NULL) |
951 | goto drop; | |
1da177e4 | 952 | |
fb286bb2 | 953 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 954 | goto drop; |
fb286bb2 HX |
955 | |
956 | switch (skb->ip_summed) { | |
84fa7933 | 957 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 958 | if (!csum_fold(skb->csum)) |
fb286bb2 HX |
959 | break; |
960 | /* fall through */ | |
961 | case CHECKSUM_NONE: | |
962 | skb->csum = 0; | |
963 | if (__skb_checksum_complete(skb)) | |
9a57a9d2 | 964 | goto drop; |
1da177e4 LT |
965 | } |
966 | ||
d9edf9e2 | 967 | ih = igmp_hdr(skb); |
1da177e4 LT |
968 | switch (ih->type) { |
969 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
970 | igmp_heard_query(in_dev, skb, len); | |
971 | break; | |
972 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
973 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 974 | /* Is it our report looped back? */ |
c7537967 | 975 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 976 | break; |
24c69275 DS |
977 | /* don't rely on MC router hearing unicast reports */ |
978 | if (skb->pkt_type == PACKET_MULTICAST || | |
979 | skb->pkt_type == PACKET_BROADCAST) | |
980 | igmp_heard_report(in_dev, ih->group); | |
1da177e4 LT |
981 | break; |
982 | case IGMP_PIM: | |
983 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
984 | return pim_rcv_v1(skb); |
985 | #endif | |
c6b471e6 | 986 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
987 | case IGMP_DVMRP: |
988 | case IGMP_TRACE: | |
989 | case IGMP_HOST_LEAVE_MESSAGE: | |
990 | case IGMP_MTRACE: | |
991 | case IGMP_MTRACE_RESP: | |
992 | break; | |
993 | default: | |
dd1c1853 | 994 | break; |
1da177e4 | 995 | } |
fb286bb2 | 996 | |
cd557bc1 | 997 | drop: |
1da177e4 LT |
998 | kfree_skb(skb); |
999 | return 0; | |
1000 | } | |
1001 | ||
1002 | #endif | |
1003 | ||
1004 | ||
1005 | /* | |
1006 | * Add a filter to a device | |
1007 | */ | |
1008 | ||
63007727 | 1009 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1010 | { |
1011 | char buf[MAX_ADDR_LEN]; | |
1012 | struct net_device *dev = in_dev->dev; | |
1013 | ||
1014 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1015 | We will get multicast token leakage, when IFF_MULTICAST | |
1016 | is changed. This check should be done in dev->set_multicast_list | |
1017 | routine. Something sort of: | |
1018 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1019 | --ANK | |
1020 | */ | |
1021 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1022 | dev_mc_add(dev, buf); |
1da177e4 LT |
1023 | } |
1024 | ||
1025 | /* | |
1026 | * Remove a filter from a device | |
1027 | */ | |
1028 | ||
63007727 | 1029 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1030 | { |
1031 | char buf[MAX_ADDR_LEN]; | |
1032 | struct net_device *dev = in_dev->dev; | |
1033 | ||
1034 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1035 | dev_mc_del(dev, buf); |
1da177e4 LT |
1036 | } |
1037 | ||
1038 | #ifdef CONFIG_IP_MULTICAST | |
1039 | /* | |
1040 | * deleted ip_mc_list manipulation | |
1041 | */ | |
1042 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1043 | { | |
1044 | struct ip_mc_list *pmc; | |
1045 | ||
1046 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1047 | * are actually used. In particular, the refcnt and users are not | |
1048 | * used for management of the delete list. Using the same structure | |
1049 | * for deleted items allows change reports to use common code with | |
1050 | * non-deleted or query-response MCA's. | |
1051 | */ | |
0da974f4 | 1052 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1053 | if (!pmc) |
1054 | return; | |
1da177e4 LT |
1055 | spin_lock_bh(&im->lock); |
1056 | pmc->interface = im->interface; | |
1057 | in_dev_hold(in_dev); | |
1058 | pmc->multiaddr = im->multiaddr; | |
1059 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1060 | IGMP_Unsolicited_Report_Count; | |
1061 | pmc->sfmode = im->sfmode; | |
1062 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1063 | struct ip_sf_list *psf; | |
1064 | ||
1065 | pmc->tomb = im->tomb; | |
1066 | pmc->sources = im->sources; | |
1067 | im->tomb = im->sources = NULL; | |
1068 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1069 | psf->sf_crcount = pmc->crcount; | |
1070 | } | |
1071 | spin_unlock_bh(&im->lock); | |
1072 | ||
1073 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1074 | pmc->next = in_dev->mc_tomb; | |
1075 | in_dev->mc_tomb = pmc; | |
1076 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1077 | } | |
1078 | ||
63007727 | 1079 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1080 | { |
1081 | struct ip_mc_list *pmc, *pmc_prev; | |
1082 | struct ip_sf_list *psf, *psf_next; | |
1083 | ||
1084 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1085 | pmc_prev = NULL; | |
1086 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { | |
1087 | if (pmc->multiaddr == multiaddr) | |
1088 | break; | |
1089 | pmc_prev = pmc; | |
1090 | } | |
1091 | if (pmc) { | |
1092 | if (pmc_prev) | |
1093 | pmc_prev->next = pmc->next; | |
1094 | else | |
1095 | in_dev->mc_tomb = pmc->next; | |
1096 | } | |
1097 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1098 | if (pmc) { | |
1099 | for (psf=pmc->tomb; psf; psf=psf_next) { | |
1100 | psf_next = psf->sf_next; | |
1101 | kfree(psf); | |
1102 | } | |
1103 | in_dev_put(pmc->interface); | |
1104 | kfree(pmc); | |
1105 | } | |
1106 | } | |
1107 | ||
1108 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1109 | { | |
1110 | struct ip_mc_list *pmc, *nextpmc; | |
1111 | ||
1112 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1113 | pmc = in_dev->mc_tomb; | |
1114 | in_dev->mc_tomb = NULL; | |
1115 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1116 | ||
1117 | for (; pmc; pmc = nextpmc) { | |
1118 | nextpmc = pmc->next; | |
1119 | ip_mc_clear_src(pmc); | |
1120 | in_dev_put(pmc->interface); | |
1121 | kfree(pmc); | |
1122 | } | |
1123 | /* clear dead sources, too */ | |
1d7138de ED |
1124 | rcu_read_lock(); |
1125 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1126 | struct ip_sf_list *psf, *psf_next; |
1127 | ||
1128 | spin_lock_bh(&pmc->lock); | |
1129 | psf = pmc->tomb; | |
1130 | pmc->tomb = NULL; | |
1131 | spin_unlock_bh(&pmc->lock); | |
1132 | for (; psf; psf=psf_next) { | |
1133 | psf_next = psf->sf_next; | |
1134 | kfree(psf); | |
1135 | } | |
1136 | } | |
1d7138de | 1137 | rcu_read_unlock(); |
1da177e4 LT |
1138 | } |
1139 | #endif | |
1140 | ||
1141 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1142 | { | |
1143 | struct in_device *in_dev = im->interface; | |
1144 | #ifdef CONFIG_IP_MULTICAST | |
1145 | int reporter; | |
1146 | #endif | |
1147 | ||
1148 | if (im->loaded) { | |
1149 | im->loaded = 0; | |
1150 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1151 | } | |
1152 | ||
1153 | #ifdef CONFIG_IP_MULTICAST | |
1154 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1155 | return; | |
1156 | ||
1157 | reporter = im->reporter; | |
1158 | igmp_stop_timer(im); | |
1159 | ||
1160 | if (!in_dev->dead) { | |
1161 | if (IGMP_V1_SEEN(in_dev)) | |
1162 | goto done; | |
1163 | if (IGMP_V2_SEEN(in_dev)) { | |
1164 | if (reporter) | |
1165 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
1166 | goto done; | |
1167 | } | |
1168 | /* IGMPv3 */ | |
1169 | igmpv3_add_delrec(in_dev, im); | |
1170 | ||
1171 | igmp_ifc_event(in_dev); | |
1172 | } | |
1173 | done: | |
1174 | #endif | |
1175 | ip_mc_clear_src(im); | |
1176 | } | |
1177 | ||
1178 | static void igmp_group_added(struct ip_mc_list *im) | |
1179 | { | |
1180 | struct in_device *in_dev = im->interface; | |
1181 | ||
1182 | if (im->loaded == 0) { | |
1183 | im->loaded = 1; | |
1184 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1185 | } | |
1186 | ||
1187 | #ifdef CONFIG_IP_MULTICAST | |
1188 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1189 | return; | |
1190 | ||
1191 | if (in_dev->dead) | |
1192 | return; | |
1193 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1194 | spin_lock_bh(&im->lock); | |
1195 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1196 | spin_unlock_bh(&im->lock); | |
1197 | return; | |
1198 | } | |
1199 | /* else, v3 */ | |
1200 | ||
1201 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1202 | IGMP_Unsolicited_Report_Count; | |
1203 | igmp_ifc_event(in_dev); | |
1204 | #endif | |
1205 | } | |
1206 | ||
1207 | ||
1208 | /* | |
1209 | * Multicast list managers | |
1210 | */ | |
1211 | ||
1212 | ||
1213 | /* | |
1214 | * A socket has joined a multicast group on device dev. | |
1215 | */ | |
1216 | ||
8f935bbd | 1217 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1218 | { |
1219 | struct ip_mc_list *im; | |
1220 | ||
1221 | ASSERT_RTNL(); | |
1222 | ||
1d7138de | 1223 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1224 | if (im->multiaddr == addr) { |
1225 | im->users++; | |
1226 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1227 | goto out; | |
1228 | } | |
1229 | } | |
1230 | ||
1d7138de | 1231 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1232 | if (!im) |
1233 | goto out; | |
1234 | ||
a7e9ff73 JK |
1235 | im->users = 1; |
1236 | im->interface = in_dev; | |
1da177e4 | 1237 | in_dev_hold(in_dev); |
a7e9ff73 | 1238 | im->multiaddr = addr; |
1da177e4 LT |
1239 | /* initial mode is (EX, empty) */ |
1240 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1241 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1242 | atomic_set(&im->refcnt, 1); |
1243 | spin_lock_init(&im->lock); | |
1244 | #ifdef CONFIG_IP_MULTICAST | |
b24b8a24 | 1245 | setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); |
1da177e4 | 1246 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; |
1da177e4 | 1247 | #endif |
1d7138de ED |
1248 | |
1249 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1250 | in_dev->mc_count++; |
1d7138de ED |
1251 | rcu_assign_pointer(in_dev->mc_list, im); |
1252 | ||
1da177e4 LT |
1253 | #ifdef CONFIG_IP_MULTICAST |
1254 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1255 | #endif | |
1256 | igmp_group_added(im); | |
1257 | if (!in_dev->dead) | |
1258 | ip_rt_multicast_event(in_dev); | |
1259 | out: | |
1260 | return; | |
1261 | } | |
4bc2f18b | 1262 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1263 | |
a816c7c7 JV |
1264 | /* |
1265 | * Resend IGMP JOIN report; used for bonding. | |
866f3b25 | 1266 | * Called with rcu_read_lock() |
a816c7c7 | 1267 | */ |
866f3b25 | 1268 | void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1269 | { |
08882669 | 1270 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1271 | struct ip_mc_list *im; |
1272 | int type; | |
a816c7c7 | 1273 | |
866f3b25 ED |
1274 | for_each_pmc_rcu(in_dev, im) { |
1275 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1276 | continue; | |
a816c7c7 | 1277 | |
866f3b25 ED |
1278 | /* a failover is happening and switches |
1279 | * must be notified immediately | |
1280 | */ | |
1281 | if (IGMP_V1_SEEN(in_dev)) | |
1282 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1283 | else if (IGMP_V2_SEEN(in_dev)) | |
1284 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1285 | else | |
1286 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1287 | igmp_send_report(in_dev, im, type); | |
1288 | } | |
a816c7c7 JV |
1289 | #endif |
1290 | } | |
866f3b25 | 1291 | EXPORT_SYMBOL(ip_mc_rejoin_groups); |
a816c7c7 | 1292 | |
1da177e4 LT |
1293 | /* |
1294 | * A socket has left a multicast group on device dev | |
1295 | */ | |
1296 | ||
8f935bbd | 1297 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1298 | { |
1d7138de ED |
1299 | struct ip_mc_list *i; |
1300 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1301 | |
1da177e4 | 1302 | ASSERT_RTNL(); |
e905a9ed | 1303 | |
1d7138de ED |
1304 | for (ip = &in_dev->mc_list; |
1305 | (i = rtnl_dereference(*ip)) != NULL; | |
1306 | ip = &i->next_rcu) { | |
a7e9ff73 | 1307 | if (i->multiaddr == addr) { |
1da177e4 | 1308 | if (--i->users == 0) { |
1d7138de | 1309 | *ip = i->next_rcu; |
b8bae41e | 1310 | in_dev->mc_count--; |
1da177e4 LT |
1311 | igmp_group_dropped(i); |
1312 | ||
1313 | if (!in_dev->dead) | |
1314 | ip_rt_multicast_event(in_dev); | |
1315 | ||
1316 | ip_ma_put(i); | |
1317 | return; | |
1318 | } | |
1319 | break; | |
1320 | } | |
1321 | } | |
1322 | } | |
4bc2f18b | 1323 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1324 | |
75c78500 MS |
1325 | /* Device changing type */ |
1326 | ||
1327 | void ip_mc_unmap(struct in_device *in_dev) | |
1328 | { | |
1d7138de | 1329 | struct ip_mc_list *pmc; |
75c78500 MS |
1330 | |
1331 | ASSERT_RTNL(); | |
1332 | ||
1d7138de ED |
1333 | for_each_pmc_rtnl(in_dev, pmc) |
1334 | igmp_group_dropped(pmc); | |
75c78500 MS |
1335 | } |
1336 | ||
1337 | void ip_mc_remap(struct in_device *in_dev) | |
1338 | { | |
1d7138de | 1339 | struct ip_mc_list *pmc; |
75c78500 MS |
1340 | |
1341 | ASSERT_RTNL(); | |
1342 | ||
1d7138de ED |
1343 | for_each_pmc_rtnl(in_dev, pmc) |
1344 | igmp_group_added(pmc); | |
75c78500 MS |
1345 | } |
1346 | ||
1da177e4 LT |
1347 | /* Device going down */ |
1348 | ||
1349 | void ip_mc_down(struct in_device *in_dev) | |
1350 | { | |
1d7138de | 1351 | struct ip_mc_list *pmc; |
1da177e4 LT |
1352 | |
1353 | ASSERT_RTNL(); | |
1354 | ||
1d7138de ED |
1355 | for_each_pmc_rtnl(in_dev, pmc) |
1356 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1357 | |
1358 | #ifdef CONFIG_IP_MULTICAST | |
1359 | in_dev->mr_ifc_count = 0; | |
1360 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1361 | __in_dev_put(in_dev); | |
1362 | in_dev->mr_gq_running = 0; | |
1363 | if (del_timer(&in_dev->mr_gq_timer)) | |
1364 | __in_dev_put(in_dev); | |
1365 | igmpv3_clear_delrec(in_dev); | |
1366 | #endif | |
1367 | ||
1368 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1369 | } | |
1370 | ||
1371 | void ip_mc_init_dev(struct in_device *in_dev) | |
1372 | { | |
1373 | ASSERT_RTNL(); | |
1374 | ||
1375 | in_dev->mc_tomb = NULL; | |
1376 | #ifdef CONFIG_IP_MULTICAST | |
1377 | in_dev->mr_gq_running = 0; | |
b24b8a24 PE |
1378 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1379 | (unsigned long)in_dev); | |
1da177e4 | 1380 | in_dev->mr_ifc_count = 0; |
b8bae41e | 1381 | in_dev->mc_count = 0; |
b24b8a24 PE |
1382 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1383 | (unsigned long)in_dev); | |
1da177e4 LT |
1384 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; |
1385 | #endif | |
1386 | ||
1da177e4 LT |
1387 | spin_lock_init(&in_dev->mc_tomb_lock); |
1388 | } | |
1389 | ||
1390 | /* Device going up */ | |
1391 | ||
1392 | void ip_mc_up(struct in_device *in_dev) | |
1393 | { | |
1d7138de | 1394 | struct ip_mc_list *pmc; |
1da177e4 LT |
1395 | |
1396 | ASSERT_RTNL(); | |
1397 | ||
1398 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1399 | ||
1d7138de ED |
1400 | for_each_pmc_rtnl(in_dev, pmc) |
1401 | igmp_group_added(pmc); | |
1da177e4 LT |
1402 | } |
1403 | ||
1404 | /* | |
1405 | * Device is about to be destroyed: clean up. | |
1406 | */ | |
1407 | ||
1408 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1409 | { | |
1410 | struct ip_mc_list *i; | |
1411 | ||
1412 | ASSERT_RTNL(); | |
1413 | ||
1414 | /* Deactivate timers */ | |
1415 | ip_mc_down(in_dev); | |
1416 | ||
1d7138de ED |
1417 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1418 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1419 | in_dev->mc_count--; |
1d7138de | 1420 | |
1da177e4 LT |
1421 | igmp_group_dropped(i); |
1422 | ip_ma_put(i); | |
1da177e4 | 1423 | } |
1da177e4 LT |
1424 | } |
1425 | ||
9e917dca | 1426 | /* RTNL is locked */ |
877acedc | 1427 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1428 | { |
1da177e4 LT |
1429 | struct net_device *dev = NULL; |
1430 | struct in_device *idev = NULL; | |
1431 | ||
1432 | if (imr->imr_ifindex) { | |
877acedc | 1433 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1434 | return idev; |
1435 | } | |
1436 | if (imr->imr_address.s_addr) { | |
9e917dca | 1437 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1438 | if (!dev) |
1439 | return NULL; | |
1da177e4 LT |
1440 | } |
1441 | ||
b23dd4fe | 1442 | if (!dev) { |
78fbfd8a DM |
1443 | struct rtable *rt = ip_route_output(net, |
1444 | imr->imr_multiaddr.s_addr, | |
1445 | 0, 0, 0); | |
b23dd4fe DM |
1446 | if (!IS_ERR(rt)) { |
1447 | dev = rt->dst.dev; | |
1448 | ip_rt_put(rt); | |
1449 | } | |
1da177e4 LT |
1450 | } |
1451 | if (dev) { | |
1452 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1453 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1454 | } |
1455 | return idev; | |
1456 | } | |
1457 | ||
1458 | /* | |
1459 | * Join a socket to a group | |
1460 | */ | |
ab32ea5d BH |
1461 | int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; |
1462 | int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; | |
1da177e4 LT |
1463 | |
1464 | ||
1465 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1466 | __be32 *psfsrc) |
1da177e4 LT |
1467 | { |
1468 | struct ip_sf_list *psf, *psf_prev; | |
1469 | int rv = 0; | |
1470 | ||
1471 | psf_prev = NULL; | |
1472 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1473 | if (psf->sf_inaddr == *psfsrc) | |
1474 | break; | |
1475 | psf_prev = psf; | |
1476 | } | |
1477 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1478 | /* source filter not found, or count wrong => bug */ | |
1479 | return -ESRCH; | |
1480 | } | |
1481 | psf->sf_count[sfmode]--; | |
1482 | if (psf->sf_count[sfmode] == 0) { | |
1483 | ip_rt_multicast_event(pmc->interface); | |
1484 | } | |
1485 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1486 | #ifdef CONFIG_IP_MULTICAST | |
1487 | struct in_device *in_dev = pmc->interface; | |
1488 | #endif | |
1489 | ||
1490 | /* no more filters for this source */ | |
1491 | if (psf_prev) | |
1492 | psf_prev->sf_next = psf->sf_next; | |
1493 | else | |
1494 | pmc->sources = psf->sf_next; | |
1495 | #ifdef CONFIG_IP_MULTICAST | |
1496 | if (psf->sf_oldin && | |
1497 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
e905a9ed | 1498 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1499 | IGMP_Unsolicited_Report_Count; |
1500 | psf->sf_next = pmc->tomb; | |
1501 | pmc->tomb = psf; | |
1502 | rv = 1; | |
1503 | } else | |
1504 | #endif | |
1505 | kfree(psf); | |
1506 | } | |
1507 | return rv; | |
1508 | } | |
1509 | ||
1510 | #ifndef CONFIG_IP_MULTICAST | |
1511 | #define igmp_ifc_event(x) do { } while (0) | |
1512 | #endif | |
1513 | ||
8f935bbd AV |
1514 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1515 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1516 | { |
1517 | struct ip_mc_list *pmc; | |
1518 | int changerec = 0; | |
1519 | int i, err; | |
1520 | ||
1521 | if (!in_dev) | |
1522 | return -ENODEV; | |
1d7138de ED |
1523 | rcu_read_lock(); |
1524 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1525 | if (*pmca == pmc->multiaddr) |
1526 | break; | |
1527 | } | |
1528 | if (!pmc) { | |
1529 | /* MCA not found?? bug */ | |
1d7138de | 1530 | rcu_read_unlock(); |
1da177e4 LT |
1531 | return -ESRCH; |
1532 | } | |
1533 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1534 | rcu_read_unlock(); |
1da177e4 LT |
1535 | #ifdef CONFIG_IP_MULTICAST |
1536 | sf_markstate(pmc); | |
1537 | #endif | |
1538 | if (!delta) { | |
1539 | err = -EINVAL; | |
1540 | if (!pmc->sfcount[sfmode]) | |
1541 | goto out_unlock; | |
1542 | pmc->sfcount[sfmode]--; | |
1543 | } | |
1544 | err = 0; | |
1545 | for (i=0; i<sfcount; i++) { | |
1546 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1547 | ||
1548 | changerec |= rv > 0; | |
1549 | if (!err && rv < 0) | |
1550 | err = rv; | |
1551 | } | |
1552 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1553 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1554 | pmc->sfcount[MCAST_INCLUDE]) { | |
1555 | #ifdef CONFIG_IP_MULTICAST | |
1556 | struct ip_sf_list *psf; | |
1557 | #endif | |
1558 | ||
1559 | /* filter mode change */ | |
1560 | pmc->sfmode = MCAST_INCLUDE; | |
1561 | #ifdef CONFIG_IP_MULTICAST | |
e905a9ed | 1562 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1563 | IGMP_Unsolicited_Report_Count; |
1564 | in_dev->mr_ifc_count = pmc->crcount; | |
1565 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1566 | psf->sf_crcount = 0; | |
1567 | igmp_ifc_event(pmc->interface); | |
1568 | } else if (sf_setstate(pmc) || changerec) { | |
1569 | igmp_ifc_event(pmc->interface); | |
1570 | #endif | |
1571 | } | |
1572 | out_unlock: | |
1573 | spin_unlock_bh(&pmc->lock); | |
1574 | return err; | |
1575 | } | |
1576 | ||
1577 | /* | |
1578 | * Add multicast single-source filter to the interface list | |
1579 | */ | |
1580 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1581 | __be32 *psfsrc, int delta) |
1da177e4 LT |
1582 | { |
1583 | struct ip_sf_list *psf, *psf_prev; | |
1584 | ||
1585 | psf_prev = NULL; | |
1586 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1587 | if (psf->sf_inaddr == *psfsrc) | |
1588 | break; | |
1589 | psf_prev = psf; | |
1590 | } | |
1591 | if (!psf) { | |
0da974f4 | 1592 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1593 | if (!psf) |
1594 | return -ENOBUFS; | |
1da177e4 LT |
1595 | psf->sf_inaddr = *psfsrc; |
1596 | if (psf_prev) { | |
1597 | psf_prev->sf_next = psf; | |
1598 | } else | |
1599 | pmc->sources = psf; | |
1600 | } | |
1601 | psf->sf_count[sfmode]++; | |
1602 | if (psf->sf_count[sfmode] == 1) { | |
1603 | ip_rt_multicast_event(pmc->interface); | |
1604 | } | |
1605 | return 0; | |
1606 | } | |
1607 | ||
1608 | #ifdef CONFIG_IP_MULTICAST | |
1609 | static void sf_markstate(struct ip_mc_list *pmc) | |
1610 | { | |
1611 | struct ip_sf_list *psf; | |
1612 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1613 | ||
1614 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1615 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1616 | psf->sf_oldin = mca_xcount == | |
1617 | psf->sf_count[MCAST_EXCLUDE] && | |
1618 | !psf->sf_count[MCAST_INCLUDE]; | |
1619 | } else | |
1620 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1621 | } | |
1622 | ||
1623 | static int sf_setstate(struct ip_mc_list *pmc) | |
1624 | { | |
ad12583f | 1625 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1626 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1627 | int qrv = pmc->interface->mr_qrv; | |
1628 | int new_in, rv; | |
1629 | ||
1630 | rv = 0; | |
1631 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1632 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1633 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1634 | !psf->sf_count[MCAST_INCLUDE]; | |
1635 | } else | |
1636 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1637 | if (new_in) { |
1638 | if (!psf->sf_oldin) { | |
76edc605 | 1639 | struct ip_sf_list *prev = NULL; |
ad12583f DS |
1640 | |
1641 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { | |
1642 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1643 | break; | |
1644 | prev = dpsf; | |
1645 | } | |
1646 | if (dpsf) { | |
1647 | if (prev) | |
1648 | prev->sf_next = dpsf->sf_next; | |
1649 | else | |
1650 | pmc->tomb = dpsf->sf_next; | |
1651 | kfree(dpsf); | |
1652 | } | |
1653 | psf->sf_crcount = qrv; | |
1654 | rv++; | |
1655 | } | |
1656 | } else if (psf->sf_oldin) { | |
1657 | ||
1658 | psf->sf_crcount = 0; | |
1659 | /* | |
1660 | * add or update "delete" records if an active filter | |
1661 | * is now inactive | |
1662 | */ | |
1663 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) | |
1664 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1665 | break; | |
1666 | if (!dpsf) { | |
3ed37a6f | 1667 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1668 | if (!dpsf) |
1669 | continue; | |
1670 | *dpsf = *psf; | |
1671 | /* pmc->lock held by callers */ | |
1672 | dpsf->sf_next = pmc->tomb; | |
1673 | pmc->tomb = dpsf; | |
1674 | } | |
1675 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1676 | rv++; |
1677 | } | |
1678 | } | |
1679 | return rv; | |
1680 | } | |
1681 | #endif | |
1682 | ||
1683 | /* | |
1684 | * Add multicast source filter list to the interface list | |
1685 | */ | |
8f935bbd AV |
1686 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1687 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1688 | { |
1689 | struct ip_mc_list *pmc; | |
1690 | int isexclude; | |
1691 | int i, err; | |
1692 | ||
1693 | if (!in_dev) | |
1694 | return -ENODEV; | |
1d7138de ED |
1695 | rcu_read_lock(); |
1696 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1697 | if (*pmca == pmc->multiaddr) |
1698 | break; | |
1699 | } | |
1700 | if (!pmc) { | |
1701 | /* MCA not found?? bug */ | |
1d7138de | 1702 | rcu_read_unlock(); |
1da177e4 LT |
1703 | return -ESRCH; |
1704 | } | |
1705 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1706 | rcu_read_unlock(); |
1da177e4 LT |
1707 | |
1708 | #ifdef CONFIG_IP_MULTICAST | |
1709 | sf_markstate(pmc); | |
1710 | #endif | |
1711 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1712 | if (!delta) | |
1713 | pmc->sfcount[sfmode]++; | |
1714 | err = 0; | |
1715 | for (i=0; i<sfcount; i++) { | |
1716 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); | |
1717 | if (err) | |
1718 | break; | |
1719 | } | |
1720 | if (err) { | |
1721 | int j; | |
1722 | ||
1723 | pmc->sfcount[sfmode]--; | |
1724 | for (j=0; j<i; j++) | |
1725 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1726 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { | |
1727 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 1728 | struct ip_sf_list *psf; |
cfcabdcc | 1729 | in_dev = pmc->interface; |
1da177e4 LT |
1730 | #endif |
1731 | ||
1732 | /* filter mode change */ | |
1733 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1734 | pmc->sfmode = MCAST_EXCLUDE; | |
1735 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1736 | pmc->sfmode = MCAST_INCLUDE; | |
1737 | #ifdef CONFIG_IP_MULTICAST | |
1738 | /* else no filters; keep old mode for reports */ | |
1739 | ||
e905a9ed | 1740 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1741 | IGMP_Unsolicited_Report_Count; |
1742 | in_dev->mr_ifc_count = pmc->crcount; | |
1743 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1744 | psf->sf_crcount = 0; | |
1745 | igmp_ifc_event(in_dev); | |
1746 | } else if (sf_setstate(pmc)) { | |
1747 | igmp_ifc_event(in_dev); | |
1748 | #endif | |
1749 | } | |
1750 | spin_unlock_bh(&pmc->lock); | |
1751 | return err; | |
1752 | } | |
1753 | ||
1754 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1755 | { | |
1756 | struct ip_sf_list *psf, *nextpsf; | |
1757 | ||
1758 | for (psf=pmc->tomb; psf; psf=nextpsf) { | |
1759 | nextpsf = psf->sf_next; | |
1760 | kfree(psf); | |
1761 | } | |
1762 | pmc->tomb = NULL; | |
1763 | for (psf=pmc->sources; psf; psf=nextpsf) { | |
1764 | nextpsf = psf->sf_next; | |
1765 | kfree(psf); | |
1766 | } | |
1767 | pmc->sources = NULL; | |
1768 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1769 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1770 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1771 | } | |
1772 | ||
1773 | ||
1774 | /* | |
1775 | * Join a multicast group | |
1776 | */ | |
1777 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1778 | { | |
1779 | int err; | |
8f935bbd | 1780 | __be32 addr = imr->imr_multiaddr.s_addr; |
a7e9ff73 | 1781 | struct ip_mc_socklist *iml = NULL, *i; |
1da177e4 LT |
1782 | struct in_device *in_dev; |
1783 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 1784 | struct net *net = sock_net(sk); |
ca9b907d | 1785 | int ifindex; |
1da177e4 LT |
1786 | int count = 0; |
1787 | ||
f97c1e0c | 1788 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1789 | return -EINVAL; |
1790 | ||
6756ae4b | 1791 | rtnl_lock(); |
1da177e4 | 1792 | |
877acedc | 1793 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
1794 | |
1795 | if (!in_dev) { | |
1796 | iml = NULL; | |
1797 | err = -ENODEV; | |
1798 | goto done; | |
1799 | } | |
1800 | ||
1da177e4 | 1801 | err = -EADDRINUSE; |
ca9b907d | 1802 | ifindex = imr->imr_ifindex; |
1d7138de | 1803 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
1804 | if (i->multi.imr_multiaddr.s_addr == addr && |
1805 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1806 | goto done; |
1da177e4 LT |
1807 | count++; |
1808 | } | |
1809 | err = -ENOBUFS; | |
ca9b907d DS |
1810 | if (count >= sysctl_igmp_max_memberships) |
1811 | goto done; | |
a7e9ff73 | 1812 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
ca9b907d | 1813 | if (iml == NULL) |
1da177e4 | 1814 | goto done; |
ca9b907d | 1815 | |
1da177e4 | 1816 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 1817 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
1818 | iml->sflist = NULL; |
1819 | iml->sfmode = MCAST_EXCLUDE; | |
c85bb41e | 1820 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 1821 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 1822 | err = 0; |
1da177e4 | 1823 | done: |
6756ae4b | 1824 | rtnl_unlock(); |
1da177e4 LT |
1825 | return err; |
1826 | } | |
4bc2f18b | 1827 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 | 1828 | |
c85bb41e FL |
1829 | static void ip_sf_socklist_reclaim(struct rcu_head *rp) |
1830 | { | |
1d7138de | 1831 | kfree(container_of(rp, struct ip_sf_socklist, rcu)); |
c85bb41e | 1832 | /* sk_omem_alloc should have been decreased by the caller*/ |
c85bb41e FL |
1833 | } |
1834 | ||
1da177e4 LT |
1835 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, |
1836 | struct in_device *in_dev) | |
1837 | { | |
1d7138de | 1838 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
1839 | int err; |
1840 | ||
c85bb41e | 1841 | if (psf == NULL) { |
1da177e4 LT |
1842 | /* any-source empty exclude case */ |
1843 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1844 | iml->sfmode, 0, NULL, 0); | |
1845 | } | |
1846 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e FL |
1847 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
1848 | rcu_assign_pointer(iml->sflist, NULL); | |
1849 | /* decrease mem now to avoid the memleak warning */ | |
1850 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
1851 | call_rcu(&psf->rcu, ip_sf_socklist_reclaim); | |
1da177e4 LT |
1852 | return err; |
1853 | } | |
1854 | ||
c85bb41e FL |
1855 | |
1856 | static void ip_mc_socklist_reclaim(struct rcu_head *rp) | |
1857 | { | |
1d7138de | 1858 | kfree(container_of(rp, struct ip_mc_socklist, rcu)); |
c85bb41e | 1859 | /* sk_omem_alloc should have been decreased by the caller*/ |
c85bb41e FL |
1860 | } |
1861 | ||
1862 | ||
1da177e4 LT |
1863 | /* |
1864 | * Ask a socket to leave a group. | |
1865 | */ | |
1866 | ||
1867 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1868 | { | |
1869 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
1870 | struct ip_mc_socklist *iml; |
1871 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 1872 | struct in_device *in_dev; |
877acedc | 1873 | struct net *net = sock_net(sk); |
8f935bbd | 1874 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 1875 | u32 ifindex; |
acd6e00b | 1876 | int ret = -EADDRNOTAVAIL; |
1da177e4 LT |
1877 | |
1878 | rtnl_lock(); | |
877acedc | 1879 | in_dev = ip_mc_find_dev(net, imr); |
84b42bae | 1880 | ifindex = imr->imr_ifindex; |
1d7138de ED |
1881 | for (imlp = &inet->mc_list; |
1882 | (iml = rtnl_dereference(*imlp)) != NULL; | |
1883 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
1884 | if (iml->multi.imr_multiaddr.s_addr != group) |
1885 | continue; | |
1886 | if (ifindex) { | |
1887 | if (iml->multi.imr_ifindex != ifindex) | |
1888 | continue; | |
1889 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
1890 | iml->multi.imr_address.s_addr) | |
1891 | continue; | |
1da177e4 | 1892 | |
acd6e00b | 1893 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 1894 | |
1d7138de | 1895 | *imlp = iml->next_rcu; |
acd6e00b DS |
1896 | |
1897 | if (in_dev) | |
84b42bae | 1898 | ip_mc_dec_group(in_dev, group); |
acd6e00b | 1899 | rtnl_unlock(); |
c85bb41e FL |
1900 | /* decrease mem now to avoid the memleak warning */ |
1901 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
1902 | call_rcu(&iml->rcu, ip_mc_socklist_reclaim); | |
acd6e00b | 1903 | return 0; |
1da177e4 | 1904 | } |
acd6e00b DS |
1905 | if (!in_dev) |
1906 | ret = -ENODEV; | |
1da177e4 | 1907 | rtnl_unlock(); |
acd6e00b | 1908 | return ret; |
1da177e4 LT |
1909 | } |
1910 | ||
1911 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1912 | ip_mreq_source *mreqs, int ifindex) | |
1913 | { | |
1914 | int err; | |
1915 | struct ip_mreqn imr; | |
63007727 | 1916 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
1917 | struct ip_mc_socklist *pmc; |
1918 | struct in_device *in_dev = NULL; | |
1919 | struct inet_sock *inet = inet_sk(sk); | |
1920 | struct ip_sf_socklist *psl; | |
877acedc | 1921 | struct net *net = sock_net(sk); |
8cdaaa15 | 1922 | int leavegroup = 0; |
1da177e4 LT |
1923 | int i, j, rv; |
1924 | ||
f97c1e0c | 1925 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1926 | return -EINVAL; |
1927 | ||
6756ae4b | 1928 | rtnl_lock(); |
1da177e4 LT |
1929 | |
1930 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1931 | imr.imr_address.s_addr = mreqs->imr_interface; | |
1932 | imr.imr_ifindex = ifindex; | |
877acedc | 1933 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
1934 | |
1935 | if (!in_dev) { | |
1936 | err = -ENODEV; | |
1937 | goto done; | |
1938 | } | |
1939 | err = -EADDRNOTAVAIL; | |
1940 | ||
1d7138de | 1941 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
1942 | if ((pmc->multi.imr_multiaddr.s_addr == |
1943 | imr.imr_multiaddr.s_addr) && | |
1944 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
1945 | break; |
1946 | } | |
917f2f10 DS |
1947 | if (!pmc) { /* must have a prior join */ |
1948 | err = -EINVAL; | |
1da177e4 | 1949 | goto done; |
917f2f10 | 1950 | } |
1da177e4 LT |
1951 | /* if a source filter was set, must be the same mode as before */ |
1952 | if (pmc->sflist) { | |
917f2f10 DS |
1953 | if (pmc->sfmode != omode) { |
1954 | err = -EINVAL; | |
1da177e4 | 1955 | goto done; |
917f2f10 | 1956 | } |
1da177e4 LT |
1957 | } else if (pmc->sfmode != omode) { |
1958 | /* allow mode switches for empty-set filters */ | |
1959 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 1960 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
1961 | NULL, 0); |
1962 | pmc->sfmode = omode; | |
1963 | } | |
1964 | ||
1d7138de | 1965 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
1966 | if (!add) { |
1967 | if (!psl) | |
917f2f10 | 1968 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 LT |
1969 | rv = !0; |
1970 | for (i=0; i<psl->sl_count; i++) { | |
1971 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 1972 | sizeof(__be32)); |
1da177e4 LT |
1973 | if (rv == 0) |
1974 | break; | |
1975 | } | |
1976 | if (rv) /* source not found */ | |
917f2f10 | 1977 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 1978 | |
8cdaaa15 DS |
1979 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1980 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
1981 | leavegroup = 1; | |
1982 | goto done; | |
1983 | } | |
1984 | ||
1da177e4 | 1985 | /* update the interface filter */ |
e905a9ed | 1986 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
1987 | &mreqs->imr_sourceaddr, 1); |
1988 | ||
1989 | for (j=i+1; j<psl->sl_count; j++) | |
1990 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
1991 | psl->sl_count--; | |
1992 | err = 0; | |
1993 | goto done; | |
1994 | } | |
1995 | /* else, add a new source to the filter */ | |
1996 | ||
1997 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
1998 | err = -ENOBUFS; | |
1999 | goto done; | |
2000 | } | |
2001 | if (!psl || psl->sl_count == psl->sl_max) { | |
2002 | struct ip_sf_socklist *newpsl; | |
2003 | int count = IP_SFBLOCK; | |
2004 | ||
2005 | if (psl) | |
2006 | count += psl->sl_max; | |
8b3a7005 | 2007 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2008 | if (!newpsl) { |
2009 | err = -ENOBUFS; | |
2010 | goto done; | |
2011 | } | |
2012 | newpsl->sl_max = count; | |
2013 | newpsl->sl_count = count - IP_SFBLOCK; | |
2014 | if (psl) { | |
2015 | for (i=0; i<psl->sl_count; i++) | |
2016 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
c85bb41e FL |
2017 | /* decrease mem now to avoid the memleak warning */ |
2018 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
2019 | call_rcu(&psl->rcu, ip_sf_socklist_reclaim); | |
1da177e4 | 2020 | } |
c85bb41e FL |
2021 | rcu_assign_pointer(pmc->sflist, newpsl); |
2022 | psl = newpsl; | |
1da177e4 LT |
2023 | } |
2024 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
2025 | for (i=0; i<psl->sl_count; i++) { | |
2026 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 2027 | sizeof(__be32)); |
1da177e4 LT |
2028 | if (rv == 0) |
2029 | break; | |
2030 | } | |
2031 | if (rv == 0) /* address already there is an error */ | |
2032 | goto done; | |
2033 | for (j=psl->sl_count-1; j>=i; j--) | |
2034 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
2035 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2036 | psl->sl_count++; | |
2037 | err = 0; | |
2038 | /* update the interface list */ | |
e905a9ed | 2039 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2040 | &mreqs->imr_sourceaddr, 1); |
2041 | done: | |
6756ae4b | 2042 | rtnl_unlock(); |
8cdaaa15 DS |
2043 | if (leavegroup) |
2044 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2045 | return err; |
2046 | } | |
2047 | ||
2048 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2049 | { | |
9951f036 | 2050 | int err = 0; |
1da177e4 | 2051 | struct ip_mreqn imr; |
63007727 | 2052 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2053 | struct ip_mc_socklist *pmc; |
2054 | struct in_device *in_dev; | |
2055 | struct inet_sock *inet = inet_sk(sk); | |
2056 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2057 | struct net *net = sock_net(sk); |
9951f036 | 2058 | int leavegroup = 0; |
1da177e4 | 2059 | |
f97c1e0c | 2060 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2061 | return -EINVAL; |
2062 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2063 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2064 | return -EINVAL; | |
2065 | ||
6756ae4b | 2066 | rtnl_lock(); |
1da177e4 LT |
2067 | |
2068 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2069 | imr.imr_address.s_addr = msf->imsf_interface; | |
2070 | imr.imr_ifindex = ifindex; | |
877acedc | 2071 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2072 | |
2073 | if (!in_dev) { | |
2074 | err = -ENODEV; | |
2075 | goto done; | |
2076 | } | |
1da177e4 | 2077 | |
9951f036 DS |
2078 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2079 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2080 | leavegroup = 1; | |
2081 | goto done; | |
2082 | } | |
2083 | ||
1d7138de | 2084 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2085 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2086 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2087 | break; | |
2088 | } | |
917f2f10 DS |
2089 | if (!pmc) { /* must have a prior join */ |
2090 | err = -EINVAL; | |
1da177e4 | 2091 | goto done; |
917f2f10 | 2092 | } |
1da177e4 | 2093 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2094 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2095 | GFP_KERNEL); | |
1da177e4 LT |
2096 | if (!newpsl) { |
2097 | err = -ENOBUFS; | |
2098 | goto done; | |
2099 | } | |
2100 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2101 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2102 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2103 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2104 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2105 | if (err) { | |
2106 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2107 | goto done; | |
2108 | } | |
8713dbf0 | 2109 | } else { |
1da177e4 | 2110 | newpsl = NULL; |
8713dbf0 YZ |
2111 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2112 | msf->imsf_fmode, 0, NULL, 0); | |
2113 | } | |
1d7138de | 2114 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2115 | if (psl) { |
2116 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2117 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2118 | /* decrease mem now to avoid the memleak warning */ |
2119 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
2120 | call_rcu(&psl->rcu, ip_sf_socklist_reclaim); | |
1da177e4 LT |
2121 | } else |
2122 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2123 | 0, NULL, 0); | |
c85bb41e | 2124 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2125 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2126 | err = 0; |
1da177e4 | 2127 | done: |
6756ae4b | 2128 | rtnl_unlock(); |
9951f036 DS |
2129 | if (leavegroup) |
2130 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2131 | return err; |
2132 | } | |
2133 | ||
2134 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2135 | struct ip_msfilter __user *optval, int __user *optlen) | |
2136 | { | |
2137 | int err, len, count, copycount; | |
2138 | struct ip_mreqn imr; | |
63007727 | 2139 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2140 | struct ip_mc_socklist *pmc; |
2141 | struct in_device *in_dev; | |
2142 | struct inet_sock *inet = inet_sk(sk); | |
2143 | struct ip_sf_socklist *psl; | |
877acedc | 2144 | struct net *net = sock_net(sk); |
1da177e4 | 2145 | |
f97c1e0c | 2146 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2147 | return -EINVAL; |
2148 | ||
6756ae4b | 2149 | rtnl_lock(); |
1da177e4 LT |
2150 | |
2151 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2152 | imr.imr_address.s_addr = msf->imsf_interface; | |
2153 | imr.imr_ifindex = 0; | |
877acedc | 2154 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2155 | |
2156 | if (!in_dev) { | |
2157 | err = -ENODEV; | |
2158 | goto done; | |
2159 | } | |
2160 | err = -EADDRNOTAVAIL; | |
2161 | ||
1d7138de | 2162 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2163 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2164 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2165 | break; | |
2166 | } | |
2167 | if (!pmc) /* must have a prior join */ | |
2168 | goto done; | |
2169 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2170 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2171 | rtnl_unlock(); |
1da177e4 LT |
2172 | if (!psl) { |
2173 | len = 0; | |
2174 | count = 0; | |
2175 | } else { | |
2176 | count = psl->sl_count; | |
2177 | } | |
2178 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2179 | len = copycount * sizeof(psl->sl_addr[0]); | |
2180 | msf->imsf_numsrc = count; | |
2181 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2182 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2183 | return -EFAULT; | |
2184 | } | |
2185 | if (len && | |
2186 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2187 | return -EFAULT; | |
2188 | return 0; | |
2189 | done: | |
6756ae4b | 2190 | rtnl_unlock(); |
1da177e4 LT |
2191 | return err; |
2192 | } | |
2193 | ||
2194 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2195 | struct group_filter __user *optval, int __user *optlen) | |
2196 | { | |
2197 | int err, i, count, copycount; | |
2198 | struct sockaddr_in *psin; | |
63007727 | 2199 | __be32 addr; |
1da177e4 LT |
2200 | struct ip_mc_socklist *pmc; |
2201 | struct inet_sock *inet = inet_sk(sk); | |
2202 | struct ip_sf_socklist *psl; | |
2203 | ||
2204 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2205 | if (psin->sin_family != AF_INET) | |
2206 | return -EINVAL; | |
2207 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2208 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2209 | return -EINVAL; |
2210 | ||
6756ae4b | 2211 | rtnl_lock(); |
1da177e4 LT |
2212 | |
2213 | err = -EADDRNOTAVAIL; | |
2214 | ||
1d7138de | 2215 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2216 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2217 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2218 | break; | |
2219 | } | |
2220 | if (!pmc) /* must have a prior join */ | |
2221 | goto done; | |
2222 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2223 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2224 | rtnl_unlock(); |
1da177e4 LT |
2225 | count = psl ? psl->sl_count : 0; |
2226 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2227 | gsf->gf_numsrc = count; | |
2228 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2229 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2230 | return -EFAULT; | |
2231 | } | |
2232 | for (i=0; i<copycount; i++) { | |
1da177e4 LT |
2233 | struct sockaddr_storage ss; |
2234 | ||
2235 | psin = (struct sockaddr_in *)&ss; | |
2236 | memset(&ss, 0, sizeof(ss)); | |
2237 | psin->sin_family = AF_INET; | |
2238 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2239 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2240 | return -EFAULT; | |
2241 | } | |
2242 | return 0; | |
2243 | done: | |
6756ae4b | 2244 | rtnl_unlock(); |
1da177e4 LT |
2245 | return err; |
2246 | } | |
2247 | ||
2248 | /* | |
2249 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2250 | */ | |
c0cda068 | 2251 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2252 | { |
2253 | struct inet_sock *inet = inet_sk(sk); | |
2254 | struct ip_mc_socklist *pmc; | |
2255 | struct ip_sf_socklist *psl; | |
2256 | int i; | |
c85bb41e | 2257 | int ret; |
1da177e4 | 2258 | |
c85bb41e | 2259 | ret = 1; |
f97c1e0c | 2260 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2261 | goto out; |
1da177e4 | 2262 | |
c85bb41e | 2263 | rcu_read_lock(); |
1d7138de | 2264 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2265 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2266 | pmc->multi.imr_ifindex == dif) | |
2267 | break; | |
2268 | } | |
c85bb41e | 2269 | ret = inet->mc_all; |
1da177e4 | 2270 | if (!pmc) |
c85bb41e | 2271 | goto unlock; |
1d7138de | 2272 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2273 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2274 | if (!psl) |
c85bb41e | 2275 | goto unlock; |
1da177e4 LT |
2276 | |
2277 | for (i=0; i<psl->sl_count; i++) { | |
2278 | if (psl->sl_addr[i] == rmt_addr) | |
2279 | break; | |
2280 | } | |
c85bb41e | 2281 | ret = 0; |
1da177e4 | 2282 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2283 | goto unlock; |
1da177e4 | 2284 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2285 | goto unlock; |
2286 | ret = 1; | |
2287 | unlock: | |
2288 | rcu_read_unlock(); | |
2289 | out: | |
2290 | return ret; | |
1da177e4 LT |
2291 | } |
2292 | ||
2293 | /* | |
2294 | * A socket is closing. | |
2295 | */ | |
2296 | ||
2297 | void ip_mc_drop_socket(struct sock *sk) | |
2298 | { | |
2299 | struct inet_sock *inet = inet_sk(sk); | |
2300 | struct ip_mc_socklist *iml; | |
877acedc | 2301 | struct net *net = sock_net(sk); |
1da177e4 LT |
2302 | |
2303 | if (inet->mc_list == NULL) | |
2304 | return; | |
2305 | ||
2306 | rtnl_lock(); | |
1d7138de | 2307 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2308 | struct in_device *in_dev; |
1da177e4 | 2309 | |
1d7138de | 2310 | inet->mc_list = iml->next_rcu; |
877acedc | 2311 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2312 | (void) ip_mc_leave_src(sk, iml, in_dev); |
18943d29 | 2313 | if (in_dev != NULL) |
1da177e4 | 2314 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2315 | /* decrease mem now to avoid the memleak warning */ |
2316 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
2317 | call_rcu(&iml->rcu, ip_mc_socklist_reclaim); | |
1da177e4 LT |
2318 | } |
2319 | rtnl_unlock(); | |
2320 | } | |
2321 | ||
dbdd9a52 DM |
2322 | /* called with rcu_read_lock() */ |
2323 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) | |
1da177e4 LT |
2324 | { |
2325 | struct ip_mc_list *im; | |
2326 | struct ip_sf_list *psf; | |
2327 | int rv = 0; | |
2328 | ||
1d7138de | 2329 | for_each_pmc_rcu(in_dev, im) { |
1da177e4 LT |
2330 | if (im->multiaddr == mc_addr) |
2331 | break; | |
2332 | } | |
2333 | if (im && proto == IPPROTO_IGMP) { | |
2334 | rv = 1; | |
2335 | } else if (im) { | |
2336 | if (src_addr) { | |
2337 | for (psf=im->sources; psf; psf=psf->sf_next) { | |
2338 | if (psf->sf_inaddr == src_addr) | |
2339 | break; | |
2340 | } | |
2341 | if (psf) | |
2342 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2343 | psf->sf_count[MCAST_EXCLUDE] != | |
2344 | im->sfcount[MCAST_EXCLUDE]; | |
2345 | else | |
2346 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2347 | } else | |
2348 | rv = 1; /* unspecified source; tentatively allow */ | |
2349 | } | |
1da177e4 LT |
2350 | return rv; |
2351 | } | |
2352 | ||
2353 | #if defined(CONFIG_PROC_FS) | |
2354 | struct igmp_mc_iter_state { | |
7091e728 | 2355 | struct seq_net_private p; |
1da177e4 LT |
2356 | struct net_device *dev; |
2357 | struct in_device *in_dev; | |
2358 | }; | |
2359 | ||
2360 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2361 | ||
2362 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2363 | { | |
7091e728 | 2364 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2365 | struct ip_mc_list *im = NULL; |
2366 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2367 | ||
7562f876 | 2368 | state->in_dev = NULL; |
61fbab77 | 2369 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2370 | struct in_device *in_dev; |
6baff150 ED |
2371 | |
2372 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2373 | if (!in_dev) |
2374 | continue; | |
1d7138de | 2375 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2376 | if (im) { |
2377 | state->in_dev = in_dev; | |
2378 | break; | |
2379 | } | |
1da177e4 LT |
2380 | } |
2381 | return im; | |
2382 | } | |
2383 | ||
2384 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2385 | { | |
2386 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2387 | |
1d7138de ED |
2388 | im = rcu_dereference(im->next_rcu); |
2389 | while (!im) { | |
6baff150 | 2390 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2391 | if (!state->dev) { |
2392 | state->in_dev = NULL; | |
2393 | break; | |
2394 | } | |
6baff150 | 2395 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2396 | if (!state->in_dev) |
2397 | continue; | |
1d7138de | 2398 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2399 | } |
2400 | return im; | |
2401 | } | |
2402 | ||
2403 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2404 | { | |
2405 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2406 | if (im) | |
2407 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2408 | --pos; | |
2409 | return pos ? NULL : im; | |
2410 | } | |
2411 | ||
2412 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2413 | __acquires(rcu) |
1da177e4 | 2414 | { |
61fbab77 | 2415 | rcu_read_lock(); |
1da177e4 LT |
2416 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2417 | } | |
2418 | ||
2419 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2420 | { | |
2421 | struct ip_mc_list *im; | |
2422 | if (v == SEQ_START_TOKEN) | |
2423 | im = igmp_mc_get_first(seq); | |
2424 | else | |
2425 | im = igmp_mc_get_next(seq, v); | |
2426 | ++*pos; | |
2427 | return im; | |
2428 | } | |
2429 | ||
2430 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2431 | __releases(rcu) |
1da177e4 LT |
2432 | { |
2433 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2434 | |
2435 | state->in_dev = NULL; | |
1da177e4 | 2436 | state->dev = NULL; |
61fbab77 | 2437 | rcu_read_unlock(); |
1da177e4 LT |
2438 | } |
2439 | ||
2440 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2441 | { | |
2442 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2443 | seq_puts(seq, |
1da177e4 LT |
2444 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2445 | else { | |
2446 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2447 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2448 | char *querier; | |
2449 | #ifdef CONFIG_IP_MULTICAST | |
2450 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2451 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2452 | "V3"; | |
2453 | #else | |
2454 | querier = "NONE"; | |
2455 | #endif | |
2456 | ||
1d7138de | 2457 | if (rcu_dereference(state->in_dev->mc_list) == im) { |
1da177e4 | 2458 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2459 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2460 | } |
2461 | ||
2462 | seq_printf(seq, | |
338fcf98 | 2463 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 LT |
2464 | im->multiaddr, im->users, |
2465 | im->tm_running, im->tm_running ? | |
2466 | jiffies_to_clock_t(im->timer.expires-jiffies) : 0, | |
2467 | im->reporter); | |
2468 | } | |
2469 | return 0; | |
2470 | } | |
2471 | ||
f690808e | 2472 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2473 | .start = igmp_mc_seq_start, |
2474 | .next = igmp_mc_seq_next, | |
2475 | .stop = igmp_mc_seq_stop, | |
2476 | .show = igmp_mc_seq_show, | |
2477 | }; | |
2478 | ||
2479 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2480 | { | |
7091e728 | 2481 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2482 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2483 | } |
2484 | ||
9a32144e | 2485 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2486 | .owner = THIS_MODULE, |
2487 | .open = igmp_mc_seq_open, | |
2488 | .read = seq_read, | |
2489 | .llseek = seq_lseek, | |
7091e728 | 2490 | .release = seq_release_net, |
1da177e4 LT |
2491 | }; |
2492 | ||
2493 | struct igmp_mcf_iter_state { | |
7091e728 | 2494 | struct seq_net_private p; |
1da177e4 LT |
2495 | struct net_device *dev; |
2496 | struct in_device *idev; | |
2497 | struct ip_mc_list *im; | |
2498 | }; | |
2499 | ||
2500 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2501 | ||
2502 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2503 | { | |
7091e728 | 2504 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2505 | struct ip_sf_list *psf = NULL; |
2506 | struct ip_mc_list *im = NULL; | |
2507 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2508 | ||
7562f876 PE |
2509 | state->idev = NULL; |
2510 | state->im = NULL; | |
61fbab77 | 2511 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2512 | struct in_device *idev; |
6baff150 | 2513 | idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2514 | if (unlikely(idev == NULL)) |
2515 | continue; | |
1d7138de | 2516 | im = rcu_dereference(idev->mc_list); |
1da177e4 LT |
2517 | if (likely(im != NULL)) { |
2518 | spin_lock_bh(&im->lock); | |
2519 | psf = im->sources; | |
2520 | if (likely(psf != NULL)) { | |
2521 | state->im = im; | |
2522 | state->idev = idev; | |
2523 | break; | |
2524 | } | |
2525 | spin_unlock_bh(&im->lock); | |
2526 | } | |
1da177e4 LT |
2527 | } |
2528 | return psf; | |
2529 | } | |
2530 | ||
2531 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2532 | { | |
2533 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2534 | ||
2535 | psf = psf->sf_next; | |
2536 | while (!psf) { | |
2537 | spin_unlock_bh(&state->im->lock); | |
2538 | state->im = state->im->next; | |
2539 | while (!state->im) { | |
6baff150 | 2540 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2541 | if (!state->dev) { |
2542 | state->idev = NULL; | |
2543 | goto out; | |
2544 | } | |
6baff150 | 2545 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2546 | if (!state->idev) |
2547 | continue; | |
1d7138de | 2548 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2549 | } |
2550 | if (!state->im) | |
2551 | break; | |
2552 | spin_lock_bh(&state->im->lock); | |
2553 | psf = state->im->sources; | |
2554 | } | |
2555 | out: | |
2556 | return psf; | |
2557 | } | |
2558 | ||
2559 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2560 | { | |
2561 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2562 | if (psf) | |
2563 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2564 | --pos; | |
2565 | return pos ? NULL : psf; | |
2566 | } | |
2567 | ||
2568 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2569 | __acquires(rcu) |
1da177e4 | 2570 | { |
61fbab77 | 2571 | rcu_read_lock(); |
1da177e4 LT |
2572 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2573 | } | |
2574 | ||
2575 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2576 | { | |
2577 | struct ip_sf_list *psf; | |
2578 | if (v == SEQ_START_TOKEN) | |
2579 | psf = igmp_mcf_get_first(seq); | |
2580 | else | |
2581 | psf = igmp_mcf_get_next(seq, v); | |
2582 | ++*pos; | |
2583 | return psf; | |
2584 | } | |
2585 | ||
2586 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2587 | __releases(rcu) |
1da177e4 LT |
2588 | { |
2589 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2590 | if (likely(state->im != NULL)) { | |
2591 | spin_unlock_bh(&state->im->lock); | |
2592 | state->im = NULL; | |
2593 | } | |
1d7138de | 2594 | state->idev = NULL; |
1da177e4 | 2595 | state->dev = NULL; |
61fbab77 | 2596 | rcu_read_unlock(); |
1da177e4 LT |
2597 | } |
2598 | ||
2599 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2600 | { | |
2601 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2602 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2603 | ||
2604 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2605 | seq_printf(seq, |
1da177e4 LT |
2606 | "%3s %6s " |
2607 | "%10s %10s %6s %6s\n", "Idx", | |
2608 | "Device", "MCA", | |
2609 | "SRC", "INC", "EXC"); | |
2610 | } else { | |
2611 | seq_printf(seq, | |
2612 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2613 | "0x%08x %6lu %6lu\n", |
2614 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2615 | ntohl(state->im->multiaddr), |
2616 | ntohl(psf->sf_inaddr), | |
2617 | psf->sf_count[MCAST_INCLUDE], | |
2618 | psf->sf_count[MCAST_EXCLUDE]); | |
2619 | } | |
2620 | return 0; | |
2621 | } | |
2622 | ||
f690808e | 2623 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2624 | .start = igmp_mcf_seq_start, |
2625 | .next = igmp_mcf_seq_next, | |
2626 | .stop = igmp_mcf_seq_stop, | |
2627 | .show = igmp_mcf_seq_show, | |
2628 | }; | |
2629 | ||
2630 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2631 | { | |
7091e728 | 2632 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2633 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2634 | } |
2635 | ||
9a32144e | 2636 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2637 | .owner = THIS_MODULE, |
2638 | .open = igmp_mcf_seq_open, | |
2639 | .read = seq_read, | |
2640 | .llseek = seq_lseek, | |
7091e728 | 2641 | .release = seq_release_net, |
1da177e4 LT |
2642 | }; |
2643 | ||
2c8c1e72 | 2644 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2645 | { |
7091e728 AD |
2646 | struct proc_dir_entry *pde; |
2647 | ||
2648 | pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); | |
2649 | if (!pde) | |
2650 | goto out_igmp; | |
2651 | pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); | |
2652 | if (!pde) | |
2653 | goto out_mcfilter; | |
1da177e4 | 2654 | return 0; |
7091e728 AD |
2655 | |
2656 | out_mcfilter: | |
2657 | proc_net_remove(net, "igmp"); | |
2658 | out_igmp: | |
2659 | return -ENOMEM; | |
2660 | } | |
2661 | ||
2c8c1e72 | 2662 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 AD |
2663 | { |
2664 | proc_net_remove(net, "mcfilter"); | |
2665 | proc_net_remove(net, "igmp"); | |
2666 | } | |
2667 | ||
2668 | static struct pernet_operations igmp_net_ops = { | |
2669 | .init = igmp_net_init, | |
2670 | .exit = igmp_net_exit, | |
2671 | }; | |
2672 | ||
2673 | int __init igmp_mc_proc_init(void) | |
2674 | { | |
2675 | return register_pernet_subsys(&igmp_net_ops); | |
1da177e4 LT |
2676 | } |
2677 | #endif |