Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
1da177e4 LT |
75 | #include <asm/uaccess.h> |
76 | #include <asm/system.h> | |
77 | #include <linux/types.h> | |
78 | #include <linux/kernel.h> | |
79 | #include <linux/jiffies.h> | |
80 | #include <linux/string.h> | |
81 | #include <linux/socket.h> | |
82 | #include <linux/sockios.h> | |
83 | #include <linux/in.h> | |
84 | #include <linux/inet.h> | |
85 | #include <linux/netdevice.h> | |
86 | #include <linux/skbuff.h> | |
87 | #include <linux/inetdevice.h> | |
88 | #include <linux/igmp.h> | |
89 | #include <linux/if_arp.h> | |
90 | #include <linux/rtnetlink.h> | |
91 | #include <linux/times.h> | |
14c85021 | 92 | |
457c4cbc | 93 | #include <net/net_namespace.h> |
14c85021 | 94 | #include <net/arp.h> |
1da177e4 LT |
95 | #include <net/ip.h> |
96 | #include <net/protocol.h> | |
97 | #include <net/route.h> | |
98 | #include <net/sock.h> | |
99 | #include <net/checksum.h> | |
100 | #include <linux/netfilter_ipv4.h> | |
101 | #ifdef CONFIG_IP_MROUTE | |
102 | #include <linux/mroute.h> | |
103 | #endif | |
104 | #ifdef CONFIG_PROC_FS | |
105 | #include <linux/proc_fs.h> | |
106 | #include <linux/seq_file.h> | |
107 | #endif | |
108 | ||
109 | #define IP_MAX_MEMBERSHIPS 20 | |
110 | #define IP_MAX_MSF 10 | |
111 | ||
112 | #ifdef CONFIG_IP_MULTICAST | |
113 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
114 | ||
115 | #define IGMP_V1_Router_Present_Timeout (400*HZ) | |
116 | #define IGMP_V2_Router_Present_Timeout (400*HZ) | |
117 | #define IGMP_Unsolicited_Report_Interval (10*HZ) | |
118 | #define IGMP_Query_Response_Interval (10*HZ) | |
119 | #define IGMP_Unsolicited_Report_Count 2 | |
120 | ||
121 | ||
122 | #define IGMP_Initial_Report_Delay (1) | |
123 | ||
124 | /* IGMP_Initial_Report_Delay is not from IGMP specs! | |
125 | * IGMP specs require to report membership immediately after | |
126 | * joining a group, but we delay the first report by a | |
127 | * small interval. It seems more natural and still does not | |
128 | * contradict to specs provided this delay is small enough. | |
129 | */ | |
130 | ||
42f811b8 | 131 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 132 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
133 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
134 | ((in_dev)->mr_v1_seen && \ | |
135 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
136 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 137 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
138 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
139 | ((in_dev)->mr_v2_seen && \ | |
140 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 LT |
141 | |
142 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); | |
63007727 | 143 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); |
1da177e4 LT |
144 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
145 | static int sf_setstate(struct ip_mc_list *pmc); | |
146 | static void sf_markstate(struct ip_mc_list *pmc); | |
147 | #endif | |
148 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
149 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
150 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
151 | |
152 | static void ip_ma_put(struct ip_mc_list *im) | |
153 | { | |
154 | if (atomic_dec_and_test(&im->refcnt)) { | |
155 | in_dev_put(im->interface); | |
156 | kfree(im); | |
157 | } | |
158 | } | |
159 | ||
160 | #ifdef CONFIG_IP_MULTICAST | |
161 | ||
162 | /* | |
163 | * Timer management | |
164 | */ | |
165 | ||
166 | static __inline__ void igmp_stop_timer(struct ip_mc_list *im) | |
167 | { | |
168 | spin_lock_bh(&im->lock); | |
169 | if (del_timer(&im->timer)) | |
170 | atomic_dec(&im->refcnt); | |
a7e9ff73 | 171 | im->tm_running = 0; |
1da177e4 LT |
172 | im->reporter = 0; |
173 | im->unsolicit_count = 0; | |
174 | spin_unlock_bh(&im->lock); | |
175 | } | |
176 | ||
177 | /* It must be called with locked im->lock */ | |
178 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
179 | { | |
a7e9ff73 | 180 | int tv = net_random() % max_delay; |
1da177e4 | 181 | |
a7e9ff73 | 182 | im->tm_running = 1; |
1da177e4 LT |
183 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
184 | atomic_inc(&im->refcnt); | |
185 | } | |
186 | ||
187 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
188 | { | |
189 | int tv = net_random() % in_dev->mr_maxdelay; | |
190 | ||
191 | in_dev->mr_gq_running = 1; | |
192 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
193 | in_dev_hold(in_dev); | |
194 | } | |
195 | ||
196 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
197 | { | |
198 | int tv = net_random() % delay; | |
199 | ||
200 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
201 | in_dev_hold(in_dev); | |
202 | } | |
203 | ||
204 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
205 | { | |
206 | spin_lock_bh(&im->lock); | |
207 | im->unsolicit_count = 0; | |
208 | if (del_timer(&im->timer)) { | |
209 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
210 | add_timer(&im->timer); | |
a7e9ff73 | 211 | im->tm_running = 1; |
1da177e4 LT |
212 | spin_unlock_bh(&im->lock); |
213 | return; | |
214 | } | |
215 | atomic_dec(&im->refcnt); | |
216 | } | |
217 | igmp_start_timer(im, max_delay); | |
218 | spin_unlock_bh(&im->lock); | |
219 | } | |
220 | ||
221 | ||
222 | /* | |
223 | * Send an IGMP report. | |
224 | */ | |
225 | ||
226 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
227 | ||
228 | ||
229 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
230 | int gdeleted, int sdeleted) | |
231 | { | |
232 | switch (type) { | |
233 | case IGMPV3_MODE_IS_INCLUDE: | |
234 | case IGMPV3_MODE_IS_EXCLUDE: | |
235 | if (gdeleted || sdeleted) | |
236 | return 0; | |
ad12583f DS |
237 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
238 | if (pmc->sfmode == MCAST_INCLUDE) | |
239 | return 1; | |
240 | /* don't include if this source is excluded | |
241 | * in all filters | |
242 | */ | |
243 | if (psf->sf_count[MCAST_INCLUDE]) | |
244 | return type == IGMPV3_MODE_IS_INCLUDE; | |
245 | return pmc->sfcount[MCAST_EXCLUDE] == | |
246 | psf->sf_count[MCAST_EXCLUDE]; | |
247 | } | |
248 | return 0; | |
1da177e4 LT |
249 | case IGMPV3_CHANGE_TO_INCLUDE: |
250 | if (gdeleted || sdeleted) | |
251 | return 0; | |
252 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
253 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
254 | if (gdeleted || sdeleted) | |
255 | return 0; | |
256 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
257 | psf->sf_count[MCAST_INCLUDE]) | |
258 | return 0; | |
259 | return pmc->sfcount[MCAST_EXCLUDE] == | |
260 | psf->sf_count[MCAST_EXCLUDE]; | |
261 | case IGMPV3_ALLOW_NEW_SOURCES: | |
262 | if (gdeleted || !psf->sf_crcount) | |
263 | return 0; | |
264 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
265 | case IGMPV3_BLOCK_OLD_SOURCES: | |
266 | if (pmc->sfmode == MCAST_INCLUDE) | |
267 | return gdeleted || (psf->sf_crcount && sdeleted); | |
268 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
269 | } | |
270 | return 0; | |
271 | } | |
272 | ||
273 | static int | |
274 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
275 | { | |
276 | struct ip_sf_list *psf; | |
277 | int scount = 0; | |
278 | ||
279 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
280 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) | |
281 | continue; | |
282 | scount++; | |
283 | } | |
284 | return scount; | |
285 | } | |
286 | ||
287 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) | |
288 | { | |
289 | struct sk_buff *skb; | |
290 | struct rtable *rt; | |
291 | struct iphdr *pip; | |
292 | struct igmpv3_report *pig; | |
877acedc | 293 | struct net *net = dev_net(dev); |
1da177e4 | 294 | |
f5184d26 | 295 | skb = alloc_skb(size + LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); |
1da177e4 LT |
296 | if (skb == NULL) |
297 | return NULL; | |
298 | ||
299 | { | |
300 | struct flowi fl = { .oif = dev->ifindex, | |
301 | .nl_u = { .ip4_u = { | |
302 | .daddr = IGMPV3_ALL_MCR } }, | |
303 | .proto = IPPROTO_IGMP }; | |
877acedc | 304 | if (ip_route_output_key(net, &rt, &fl)) { |
1da177e4 LT |
305 | kfree_skb(skb); |
306 | return NULL; | |
307 | } | |
308 | } | |
309 | if (rt->rt_src == 0) { | |
310 | kfree_skb(skb); | |
311 | ip_rt_put(rt); | |
312 | return NULL; | |
313 | } | |
314 | ||
d8d1f30b | 315 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
316 | skb->dev = dev; |
317 | ||
318 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
319 | ||
7e28ecc2 | 320 | skb_reset_network_header(skb); |
eddc9ec5 | 321 | pip = ip_hdr(skb); |
7e28ecc2 | 322 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
323 | |
324 | pip->version = 4; | |
325 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
326 | pip->tos = 0xc0; | |
327 | pip->frag_off = htons(IP_DF); | |
328 | pip->ttl = 1; | |
329 | pip->daddr = rt->rt_dst; | |
330 | pip->saddr = rt->rt_src; | |
331 | pip->protocol = IPPROTO_IGMP; | |
332 | pip->tot_len = 0; /* filled in later */ | |
d8d1f30b | 333 | ip_select_ident(pip, &rt->dst, NULL); |
1da177e4 LT |
334 | ((u8*)&pip[1])[0] = IPOPT_RA; |
335 | ((u8*)&pip[1])[1] = 4; | |
336 | ((u8*)&pip[1])[2] = 0; | |
337 | ((u8*)&pip[1])[3] = 0; | |
338 | ||
b0e380b1 | 339 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 340 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 341 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
342 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
343 | pig->resv1 = 0; | |
344 | pig->csum = 0; | |
345 | pig->resv2 = 0; | |
346 | pig->ngrec = 0; | |
347 | return skb; | |
348 | } | |
349 | ||
350 | static int igmpv3_sendpack(struct sk_buff *skb) | |
351 | { | |
d9edf9e2 | 352 | struct igmphdr *pig = igmp_hdr(skb); |
27a884dc | 353 | const int igmplen = skb->tail - skb->transport_header; |
1da177e4 | 354 | |
d9edf9e2 | 355 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 356 | |
c439cb2e | 357 | return ip_local_out(skb); |
1da177e4 LT |
358 | } |
359 | ||
360 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
361 | { | |
a7e9ff73 | 362 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
363 | } |
364 | ||
365 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
366 | int type, struct igmpv3_grec **ppgr) | |
367 | { | |
368 | struct net_device *dev = pmc->interface->dev; | |
369 | struct igmpv3_report *pih; | |
370 | struct igmpv3_grec *pgr; | |
371 | ||
372 | if (!skb) | |
373 | skb = igmpv3_newpack(dev, dev->mtu); | |
374 | if (!skb) | |
375 | return NULL; | |
376 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
377 | pgr->grec_type = type; | |
378 | pgr->grec_auxwords = 0; | |
379 | pgr->grec_nsrcs = 0; | |
380 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 381 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
382 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
383 | *ppgr = pgr; | |
384 | return skb; | |
385 | } | |
386 | ||
387 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ | |
388 | skb_tailroom(skb)) : 0) | |
389 | ||
390 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
391 | int type, int gdeleted, int sdeleted) | |
392 | { | |
393 | struct net_device *dev = pmc->interface->dev; | |
394 | struct igmpv3_report *pih; | |
395 | struct igmpv3_grec *pgr = NULL; | |
396 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 397 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
398 | |
399 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
400 | return skb; | |
401 | ||
402 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
403 | type == IGMPV3_MODE_IS_EXCLUDE; | |
404 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
405 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
406 | ||
ad12583f DS |
407 | stotal = scount = 0; |
408 | ||
1da177e4 LT |
409 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
410 | ||
ad12583f DS |
411 | if (!*psf_list) |
412 | goto empty_source; | |
413 | ||
d9edf9e2 | 414 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
415 | |
416 | /* EX and TO_EX get a fresh packet, if needed */ | |
417 | if (truncate) { | |
418 | if (pih && pih->ngrec && | |
419 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
420 | if (skb) | |
421 | igmpv3_sendpack(skb); | |
422 | skb = igmpv3_newpack(dev, dev->mtu); | |
423 | } | |
424 | } | |
425 | first = 1; | |
1da177e4 LT |
426 | psf_prev = NULL; |
427 | for (psf=*psf_list; psf; psf=psf_next) { | |
ea4d9e72 | 428 | __be32 *psrc; |
1da177e4 LT |
429 | |
430 | psf_next = psf->sf_next; | |
431 | ||
432 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
433 | psf_prev = psf; | |
434 | continue; | |
435 | } | |
436 | ||
437 | /* clear marks on query responses */ | |
438 | if (isquery) | |
439 | psf->sf_gsresp = 0; | |
440 | ||
63007727 | 441 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
442 | first*sizeof(struct igmpv3_grec)) { |
443 | if (truncate && !first) | |
444 | break; /* truncate these */ | |
445 | if (pgr) | |
446 | pgr->grec_nsrcs = htons(scount); | |
447 | if (skb) | |
448 | igmpv3_sendpack(skb); | |
449 | skb = igmpv3_newpack(dev, dev->mtu); | |
450 | first = 1; | |
451 | scount = 0; | |
452 | } | |
453 | if (first) { | |
454 | skb = add_grhead(skb, pmc, type, &pgr); | |
455 | first = 0; | |
456 | } | |
cc63f70b AD |
457 | if (!skb) |
458 | return NULL; | |
63007727 | 459 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 460 | *psrc = psf->sf_inaddr; |
ad12583f | 461 | scount++; stotal++; |
1da177e4 LT |
462 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
463 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
464 | psf->sf_crcount--; | |
465 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
466 | if (psf_prev) | |
467 | psf_prev->sf_next = psf->sf_next; | |
468 | else | |
469 | *psf_list = psf->sf_next; | |
470 | kfree(psf); | |
471 | continue; | |
472 | } | |
473 | } | |
474 | psf_prev = psf; | |
475 | } | |
ad12583f DS |
476 | |
477 | empty_source: | |
478 | if (!stotal) { | |
479 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
480 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
481 | return skb; | |
482 | if (pmc->crcount || isquery) { | |
483 | /* make sure we have room for group header */ | |
484 | if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { | |
485 | igmpv3_sendpack(skb); | |
486 | skb = NULL; /* add_grhead will get a new one */ | |
487 | } | |
488 | skb = add_grhead(skb, pmc, type, &pgr); | |
489 | } | |
490 | } | |
1da177e4 LT |
491 | if (pgr) |
492 | pgr->grec_nsrcs = htons(scount); | |
493 | ||
494 | if (isquery) | |
495 | pmc->gsquery = 0; /* clear query state on report */ | |
496 | return skb; | |
497 | } | |
498 | ||
499 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
500 | { | |
501 | struct sk_buff *skb = NULL; | |
502 | int type; | |
503 | ||
504 | if (!pmc) { | |
505 | read_lock(&in_dev->mc_list_lock); | |
506 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
507 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
508 | continue; | |
509 | spin_lock_bh(&pmc->lock); | |
510 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
511 | type = IGMPV3_MODE_IS_EXCLUDE; | |
512 | else | |
513 | type = IGMPV3_MODE_IS_INCLUDE; | |
514 | skb = add_grec(skb, pmc, type, 0, 0); | |
515 | spin_unlock_bh(&pmc->lock); | |
516 | } | |
517 | read_unlock(&in_dev->mc_list_lock); | |
518 | } else { | |
519 | spin_lock_bh(&pmc->lock); | |
520 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
521 | type = IGMPV3_MODE_IS_EXCLUDE; | |
522 | else | |
523 | type = IGMPV3_MODE_IS_INCLUDE; | |
524 | skb = add_grec(skb, pmc, type, 0, 0); | |
525 | spin_unlock_bh(&pmc->lock); | |
526 | } | |
527 | if (!skb) | |
528 | return 0; | |
529 | return igmpv3_sendpack(skb); | |
530 | } | |
531 | ||
532 | /* | |
533 | * remove zero-count source records from a source filter list | |
534 | */ | |
535 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
536 | { | |
537 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
538 | ||
539 | psf_prev = NULL; | |
540 | for (psf=*ppsf; psf; psf = psf_next) { | |
541 | psf_next = psf->sf_next; | |
542 | if (psf->sf_crcount == 0) { | |
543 | if (psf_prev) | |
544 | psf_prev->sf_next = psf->sf_next; | |
545 | else | |
546 | *ppsf = psf->sf_next; | |
547 | kfree(psf); | |
548 | } else | |
549 | psf_prev = psf; | |
550 | } | |
551 | } | |
552 | ||
553 | static void igmpv3_send_cr(struct in_device *in_dev) | |
554 | { | |
555 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
556 | struct sk_buff *skb = NULL; | |
557 | int type, dtype; | |
558 | ||
559 | read_lock(&in_dev->mc_list_lock); | |
560 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
561 | ||
562 | /* deleted MCA's */ | |
563 | pmc_prev = NULL; | |
564 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { | |
565 | pmc_next = pmc->next; | |
566 | if (pmc->sfmode == MCAST_INCLUDE) { | |
567 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
568 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
569 | skb = add_grec(skb, pmc, type, 1, 0); | |
570 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
571 | } | |
572 | if (pmc->crcount) { | |
1da177e4 LT |
573 | if (pmc->sfmode == MCAST_EXCLUDE) { |
574 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
575 | skb = add_grec(skb, pmc, type, 1, 0); | |
576 | } | |
ad12583f | 577 | pmc->crcount--; |
1da177e4 LT |
578 | if (pmc->crcount == 0) { |
579 | igmpv3_clear_zeros(&pmc->tomb); | |
580 | igmpv3_clear_zeros(&pmc->sources); | |
581 | } | |
582 | } | |
583 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
584 | if (pmc_prev) | |
585 | pmc_prev->next = pmc_next; | |
586 | else | |
587 | in_dev->mc_tomb = pmc_next; | |
588 | in_dev_put(pmc->interface); | |
589 | kfree(pmc); | |
590 | } else | |
591 | pmc_prev = pmc; | |
592 | } | |
593 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
594 | ||
595 | /* change recs */ | |
596 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
597 | spin_lock_bh(&pmc->lock); | |
598 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
599 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
600 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
601 | } else { | |
602 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
603 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
604 | } | |
605 | skb = add_grec(skb, pmc, type, 0, 0); | |
606 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
607 | ||
608 | /* filter mode changes */ | |
609 | if (pmc->crcount) { | |
1da177e4 LT |
610 | if (pmc->sfmode == MCAST_EXCLUDE) |
611 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
612 | else | |
613 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
614 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 615 | pmc->crcount--; |
1da177e4 LT |
616 | } |
617 | spin_unlock_bh(&pmc->lock); | |
618 | } | |
619 | read_unlock(&in_dev->mc_list_lock); | |
620 | ||
621 | if (!skb) | |
622 | return; | |
623 | (void) igmpv3_sendpack(skb); | |
624 | } | |
625 | ||
626 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
627 | int type) | |
628 | { | |
629 | struct sk_buff *skb; | |
630 | struct iphdr *iph; | |
631 | struct igmphdr *ih; | |
632 | struct rtable *rt; | |
633 | struct net_device *dev = in_dev->dev; | |
877acedc | 634 | struct net *net = dev_net(dev); |
63007727 AV |
635 | __be32 group = pmc ? pmc->multiaddr : 0; |
636 | __be32 dst; | |
1da177e4 LT |
637 | |
638 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
639 | return igmpv3_send_report(in_dev, pmc); | |
640 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
641 | dst = IGMP_ALL_ROUTER; | |
642 | else | |
643 | dst = group; | |
644 | ||
645 | { | |
646 | struct flowi fl = { .oif = dev->ifindex, | |
647 | .nl_u = { .ip4_u = { .daddr = dst } }, | |
648 | .proto = IPPROTO_IGMP }; | |
877acedc | 649 | if (ip_route_output_key(net, &rt, &fl)) |
1da177e4 LT |
650 | return -1; |
651 | } | |
652 | if (rt->rt_src == 0) { | |
653 | ip_rt_put(rt); | |
654 | return -1; | |
655 | } | |
656 | ||
a7e9ff73 | 657 | skb = alloc_skb(IGMP_SIZE+LL_ALLOCATED_SPACE(dev), GFP_ATOMIC); |
1da177e4 LT |
658 | if (skb == NULL) { |
659 | ip_rt_put(rt); | |
660 | return -1; | |
661 | } | |
662 | ||
d8d1f30b | 663 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
664 | |
665 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); | |
666 | ||
7e28ecc2 | 667 | skb_reset_network_header(skb); |
eddc9ec5 | 668 | iph = ip_hdr(skb); |
7e28ecc2 | 669 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
670 | |
671 | iph->version = 4; | |
672 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
673 | iph->tos = 0xc0; | |
674 | iph->frag_off = htons(IP_DF); | |
675 | iph->ttl = 1; | |
676 | iph->daddr = dst; | |
677 | iph->saddr = rt->rt_src; | |
678 | iph->protocol = IPPROTO_IGMP; | |
d8d1f30b | 679 | ip_select_ident(iph, &rt->dst, NULL); |
1da177e4 LT |
680 | ((u8*)&iph[1])[0] = IPOPT_RA; |
681 | ((u8*)&iph[1])[1] = 4; | |
682 | ((u8*)&iph[1])[2] = 0; | |
683 | ((u8*)&iph[1])[3] = 0; | |
1da177e4 LT |
684 | |
685 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
686 | ih->type = type; |
687 | ih->code = 0; | |
688 | ih->csum = 0; | |
689 | ih->group = group; | |
690 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 691 | |
c439cb2e | 692 | return ip_local_out(skb); |
1da177e4 LT |
693 | } |
694 | ||
695 | static void igmp_gq_timer_expire(unsigned long data) | |
696 | { | |
697 | struct in_device *in_dev = (struct in_device *)data; | |
698 | ||
699 | in_dev->mr_gq_running = 0; | |
700 | igmpv3_send_report(in_dev, NULL); | |
701 | __in_dev_put(in_dev); | |
702 | } | |
703 | ||
704 | static void igmp_ifc_timer_expire(unsigned long data) | |
705 | { | |
706 | struct in_device *in_dev = (struct in_device *)data; | |
707 | ||
708 | igmpv3_send_cr(in_dev); | |
709 | if (in_dev->mr_ifc_count) { | |
710 | in_dev->mr_ifc_count--; | |
711 | igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); | |
712 | } | |
713 | __in_dev_put(in_dev); | |
714 | } | |
715 | ||
716 | static void igmp_ifc_event(struct in_device *in_dev) | |
717 | { | |
718 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
719 | return; | |
e905a9ed | 720 | in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
721 | IGMP_Unsolicited_Report_Count; |
722 | igmp_ifc_start_timer(in_dev, 1); | |
723 | } | |
724 | ||
725 | ||
726 | static void igmp_timer_expire(unsigned long data) | |
727 | { | |
728 | struct ip_mc_list *im=(struct ip_mc_list *)data; | |
729 | struct in_device *in_dev = im->interface; | |
730 | ||
731 | spin_lock(&im->lock); | |
a7e9ff73 | 732 | im->tm_running = 0; |
1da177e4 LT |
733 | |
734 | if (im->unsolicit_count) { | |
735 | im->unsolicit_count--; | |
736 | igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); | |
737 | } | |
738 | im->reporter = 1; | |
739 | spin_unlock(&im->lock); | |
740 | ||
741 | if (IGMP_V1_SEEN(in_dev)) | |
742 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
743 | else if (IGMP_V2_SEEN(in_dev)) | |
744 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
745 | else | |
746 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
747 | ||
748 | ip_ma_put(im); | |
749 | } | |
750 | ||
ad12583f | 751 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 752 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
753 | { |
754 | struct ip_sf_list *psf; | |
755 | int i, scount; | |
756 | ||
ad12583f DS |
757 | scount = 0; |
758 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
759 | if (scount == nsrcs) | |
760 | break; | |
761 | for (i=0; i<nsrcs; i++) { | |
762 | /* skip inactive filters */ | |
763 | if (pmc->sfcount[MCAST_INCLUDE] || | |
764 | pmc->sfcount[MCAST_EXCLUDE] != | |
765 | psf->sf_count[MCAST_EXCLUDE]) | |
766 | continue; | |
767 | if (srcs[i] == psf->sf_inaddr) { | |
768 | scount++; | |
769 | break; | |
770 | } | |
771 | } | |
772 | } | |
773 | pmc->gsquery = 0; | |
774 | if (scount == nsrcs) /* all sources excluded */ | |
775 | return 0; | |
776 | return 1; | |
777 | } | |
778 | ||
ea4d9e72 | 779 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
780 | { |
781 | struct ip_sf_list *psf; | |
782 | int i, scount; | |
783 | ||
784 | if (pmc->sfmode == MCAST_EXCLUDE) | |
785 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
786 | ||
787 | /* mark INCLUDE-mode sources */ | |
1da177e4 LT |
788 | scount = 0; |
789 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
790 | if (scount == nsrcs) | |
791 | break; | |
792 | for (i=0; i<nsrcs; i++) | |
793 | if (srcs[i] == psf->sf_inaddr) { | |
794 | psf->sf_gsresp = 1; | |
795 | scount++; | |
796 | break; | |
797 | } | |
798 | } | |
ad12583f DS |
799 | if (!scount) { |
800 | pmc->gsquery = 0; | |
801 | return 0; | |
802 | } | |
803 | pmc->gsquery = 1; | |
804 | return 1; | |
1da177e4 LT |
805 | } |
806 | ||
63007727 | 807 | static void igmp_heard_report(struct in_device *in_dev, __be32 group) |
1da177e4 LT |
808 | { |
809 | struct ip_mc_list *im; | |
810 | ||
811 | /* Timers are only set for non-local groups */ | |
812 | ||
813 | if (group == IGMP_ALL_HOSTS) | |
814 | return; | |
815 | ||
816 | read_lock(&in_dev->mc_list_lock); | |
817 | for (im=in_dev->mc_list; im!=NULL; im=im->next) { | |
818 | if (im->multiaddr == group) { | |
819 | igmp_stop_timer(im); | |
820 | break; | |
821 | } | |
822 | } | |
823 | read_unlock(&in_dev->mc_list_lock); | |
824 | } | |
825 | ||
826 | static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
827 | int len) | |
828 | { | |
d9edf9e2 ACM |
829 | struct igmphdr *ih = igmp_hdr(skb); |
830 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 831 | struct ip_mc_list *im; |
63007727 | 832 | __be32 group = ih->group; |
1da177e4 LT |
833 | int max_delay; |
834 | int mark = 0; | |
835 | ||
836 | ||
5b7c8406 | 837 | if (len == 8) { |
1da177e4 LT |
838 | if (ih->code == 0) { |
839 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 840 | |
1da177e4 LT |
841 | max_delay = IGMP_Query_Response_Interval; |
842 | in_dev->mr_v1_seen = jiffies + | |
843 | IGMP_V1_Router_Present_Timeout; | |
844 | group = 0; | |
845 | } else { | |
846 | /* v2 router present */ | |
847 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
848 | in_dev->mr_v2_seen = jiffies + | |
849 | IGMP_V2_Router_Present_Timeout; | |
850 | } | |
851 | /* cancel the interface change timer */ | |
852 | in_dev->mr_ifc_count = 0; | |
853 | if (del_timer(&in_dev->mr_ifc_timer)) | |
854 | __in_dev_put(in_dev); | |
855 | /* clear deleted report items */ | |
856 | igmpv3_clear_delrec(in_dev); | |
857 | } else if (len < 12) { | |
858 | return; /* ignore bogus packet; freed by caller */ | |
5b7c8406 DS |
859 | } else if (IGMP_V1_SEEN(in_dev)) { |
860 | /* This is a v3 query with v1 queriers present */ | |
861 | max_delay = IGMP_Query_Response_Interval; | |
862 | group = 0; | |
863 | } else if (IGMP_V2_SEEN(in_dev)) { | |
864 | /* this is a v3 query with v2 queriers present; | |
865 | * Interpretation of the max_delay code is problematic here. | |
866 | * A real v2 host would use ih_code directly, while v3 has a | |
867 | * different encoding. We use the v3 encoding as more likely | |
868 | * to be intended in a v3 query. | |
869 | */ | |
870 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
1da177e4 LT |
871 | } else { /* v3 */ |
872 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
873 | return; | |
e905a9ed | 874 | |
d9edf9e2 | 875 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 876 | if (ih3->nsrcs) { |
e905a9ed | 877 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 878 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
1da177e4 | 879 | return; |
d9edf9e2 | 880 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
881 | } |
882 | ||
883 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
884 | if (!max_delay) | |
885 | max_delay = 1; /* can't mod w/ 0 */ | |
886 | in_dev->mr_maxdelay = max_delay; | |
887 | if (ih3->qrv) | |
888 | in_dev->mr_qrv = ih3->qrv; | |
889 | if (!group) { /* general query */ | |
890 | if (ih3->nsrcs) | |
891 | return; /* no sources allowed */ | |
892 | igmp_gq_start_timer(in_dev); | |
893 | return; | |
894 | } | |
895 | /* mark sources to include, if group & source-specific */ | |
896 | mark = ih3->nsrcs != 0; | |
897 | } | |
898 | ||
899 | /* | |
900 | * - Start the timers in all of our membership records | |
901 | * that the query applies to for the interface on | |
902 | * which the query arrived excl. those that belong | |
903 | * to a "local" group (224.0.0.X) | |
904 | * - For timers already running check if they need to | |
905 | * be reset. | |
906 | * - Use the igmp->igmp_code field as the maximum | |
907 | * delay possible | |
908 | */ | |
909 | read_lock(&in_dev->mc_list_lock); | |
910 | for (im=in_dev->mc_list; im!=NULL; im=im->next) { | |
ad12583f DS |
911 | int changed; |
912 | ||
1da177e4 LT |
913 | if (group && group != im->multiaddr) |
914 | continue; | |
915 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
916 | continue; | |
917 | spin_lock_bh(&im->lock); | |
918 | if (im->tm_running) | |
919 | im->gsquery = im->gsquery && mark; | |
920 | else | |
921 | im->gsquery = mark; | |
ad12583f | 922 | changed = !im->gsquery || |
e905a9ed | 923 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 924 | spin_unlock_bh(&im->lock); |
ad12583f DS |
925 | if (changed) |
926 | igmp_mod_timer(im, max_delay); | |
1da177e4 LT |
927 | } |
928 | read_unlock(&in_dev->mc_list_lock); | |
929 | } | |
930 | ||
9a57a9d2 | 931 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
932 | int igmp_rcv(struct sk_buff *skb) |
933 | { | |
934 | /* This basically follows the spec line by line -- see RFC1112 */ | |
935 | struct igmphdr *ih; | |
9a57a9d2 | 936 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 LT |
937 | int len = skb->len; |
938 | ||
cd557bc1 DL |
939 | if (in_dev == NULL) |
940 | goto drop; | |
1da177e4 | 941 | |
fb286bb2 | 942 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 943 | goto drop; |
fb286bb2 HX |
944 | |
945 | switch (skb->ip_summed) { | |
84fa7933 | 946 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 947 | if (!csum_fold(skb->csum)) |
fb286bb2 HX |
948 | break; |
949 | /* fall through */ | |
950 | case CHECKSUM_NONE: | |
951 | skb->csum = 0; | |
952 | if (__skb_checksum_complete(skb)) | |
9a57a9d2 | 953 | goto drop; |
1da177e4 LT |
954 | } |
955 | ||
d9edf9e2 | 956 | ih = igmp_hdr(skb); |
1da177e4 LT |
957 | switch (ih->type) { |
958 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
959 | igmp_heard_query(in_dev, skb, len); | |
960 | break; | |
961 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
962 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 963 | /* Is it our report looped back? */ |
511c3f92 | 964 | if (skb_rtable(skb)->fl.iif == 0) |
1da177e4 | 965 | break; |
24c69275 DS |
966 | /* don't rely on MC router hearing unicast reports */ |
967 | if (skb->pkt_type == PACKET_MULTICAST || | |
968 | skb->pkt_type == PACKET_BROADCAST) | |
969 | igmp_heard_report(in_dev, ih->group); | |
1da177e4 LT |
970 | break; |
971 | case IGMP_PIM: | |
972 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
973 | return pim_rcv_v1(skb); |
974 | #endif | |
c6b471e6 | 975 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
976 | case IGMP_DVMRP: |
977 | case IGMP_TRACE: | |
978 | case IGMP_HOST_LEAVE_MESSAGE: | |
979 | case IGMP_MTRACE: | |
980 | case IGMP_MTRACE_RESP: | |
981 | break; | |
982 | default: | |
dd1c1853 | 983 | break; |
1da177e4 | 984 | } |
fb286bb2 | 985 | |
cd557bc1 | 986 | drop: |
1da177e4 LT |
987 | kfree_skb(skb); |
988 | return 0; | |
989 | } | |
990 | ||
991 | #endif | |
992 | ||
993 | ||
994 | /* | |
995 | * Add a filter to a device | |
996 | */ | |
997 | ||
63007727 | 998 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
999 | { |
1000 | char buf[MAX_ADDR_LEN]; | |
1001 | struct net_device *dev = in_dev->dev; | |
1002 | ||
1003 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1004 | We will get multicast token leakage, when IFF_MULTICAST | |
1005 | is changed. This check should be done in dev->set_multicast_list | |
1006 | routine. Something sort of: | |
1007 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1008 | --ANK | |
1009 | */ | |
1010 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1011 | dev_mc_add(dev, buf); |
1da177e4 LT |
1012 | } |
1013 | ||
1014 | /* | |
1015 | * Remove a filter from a device | |
1016 | */ | |
1017 | ||
63007727 | 1018 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1019 | { |
1020 | char buf[MAX_ADDR_LEN]; | |
1021 | struct net_device *dev = in_dev->dev; | |
1022 | ||
1023 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1024 | dev_mc_del(dev, buf); |
1da177e4 LT |
1025 | } |
1026 | ||
1027 | #ifdef CONFIG_IP_MULTICAST | |
1028 | /* | |
1029 | * deleted ip_mc_list manipulation | |
1030 | */ | |
1031 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1032 | { | |
1033 | struct ip_mc_list *pmc; | |
1034 | ||
1035 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1036 | * are actually used. In particular, the refcnt and users are not | |
1037 | * used for management of the delete list. Using the same structure | |
1038 | * for deleted items allows change reports to use common code with | |
1039 | * non-deleted or query-response MCA's. | |
1040 | */ | |
0da974f4 | 1041 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1042 | if (!pmc) |
1043 | return; | |
1da177e4 LT |
1044 | spin_lock_bh(&im->lock); |
1045 | pmc->interface = im->interface; | |
1046 | in_dev_hold(in_dev); | |
1047 | pmc->multiaddr = im->multiaddr; | |
1048 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1049 | IGMP_Unsolicited_Report_Count; | |
1050 | pmc->sfmode = im->sfmode; | |
1051 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1052 | struct ip_sf_list *psf; | |
1053 | ||
1054 | pmc->tomb = im->tomb; | |
1055 | pmc->sources = im->sources; | |
1056 | im->tomb = im->sources = NULL; | |
1057 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1058 | psf->sf_crcount = pmc->crcount; | |
1059 | } | |
1060 | spin_unlock_bh(&im->lock); | |
1061 | ||
1062 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1063 | pmc->next = in_dev->mc_tomb; | |
1064 | in_dev->mc_tomb = pmc; | |
1065 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1066 | } | |
1067 | ||
63007727 | 1068 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1069 | { |
1070 | struct ip_mc_list *pmc, *pmc_prev; | |
1071 | struct ip_sf_list *psf, *psf_next; | |
1072 | ||
1073 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1074 | pmc_prev = NULL; | |
1075 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { | |
1076 | if (pmc->multiaddr == multiaddr) | |
1077 | break; | |
1078 | pmc_prev = pmc; | |
1079 | } | |
1080 | if (pmc) { | |
1081 | if (pmc_prev) | |
1082 | pmc_prev->next = pmc->next; | |
1083 | else | |
1084 | in_dev->mc_tomb = pmc->next; | |
1085 | } | |
1086 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1087 | if (pmc) { | |
1088 | for (psf=pmc->tomb; psf; psf=psf_next) { | |
1089 | psf_next = psf->sf_next; | |
1090 | kfree(psf); | |
1091 | } | |
1092 | in_dev_put(pmc->interface); | |
1093 | kfree(pmc); | |
1094 | } | |
1095 | } | |
1096 | ||
1097 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1098 | { | |
1099 | struct ip_mc_list *pmc, *nextpmc; | |
1100 | ||
1101 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1102 | pmc = in_dev->mc_tomb; | |
1103 | in_dev->mc_tomb = NULL; | |
1104 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1105 | ||
1106 | for (; pmc; pmc = nextpmc) { | |
1107 | nextpmc = pmc->next; | |
1108 | ip_mc_clear_src(pmc); | |
1109 | in_dev_put(pmc->interface); | |
1110 | kfree(pmc); | |
1111 | } | |
1112 | /* clear dead sources, too */ | |
1113 | read_lock(&in_dev->mc_list_lock); | |
1114 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1115 | struct ip_sf_list *psf, *psf_next; | |
1116 | ||
1117 | spin_lock_bh(&pmc->lock); | |
1118 | psf = pmc->tomb; | |
1119 | pmc->tomb = NULL; | |
1120 | spin_unlock_bh(&pmc->lock); | |
1121 | for (; psf; psf=psf_next) { | |
1122 | psf_next = psf->sf_next; | |
1123 | kfree(psf); | |
1124 | } | |
1125 | } | |
1126 | read_unlock(&in_dev->mc_list_lock); | |
1127 | } | |
1128 | #endif | |
1129 | ||
1130 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1131 | { | |
1132 | struct in_device *in_dev = im->interface; | |
1133 | #ifdef CONFIG_IP_MULTICAST | |
1134 | int reporter; | |
1135 | #endif | |
1136 | ||
1137 | if (im->loaded) { | |
1138 | im->loaded = 0; | |
1139 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1140 | } | |
1141 | ||
1142 | #ifdef CONFIG_IP_MULTICAST | |
1143 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1144 | return; | |
1145 | ||
1146 | reporter = im->reporter; | |
1147 | igmp_stop_timer(im); | |
1148 | ||
1149 | if (!in_dev->dead) { | |
1150 | if (IGMP_V1_SEEN(in_dev)) | |
1151 | goto done; | |
1152 | if (IGMP_V2_SEEN(in_dev)) { | |
1153 | if (reporter) | |
1154 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
1155 | goto done; | |
1156 | } | |
1157 | /* IGMPv3 */ | |
1158 | igmpv3_add_delrec(in_dev, im); | |
1159 | ||
1160 | igmp_ifc_event(in_dev); | |
1161 | } | |
1162 | done: | |
1163 | #endif | |
1164 | ip_mc_clear_src(im); | |
1165 | } | |
1166 | ||
1167 | static void igmp_group_added(struct ip_mc_list *im) | |
1168 | { | |
1169 | struct in_device *in_dev = im->interface; | |
1170 | ||
1171 | if (im->loaded == 0) { | |
1172 | im->loaded = 1; | |
1173 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1174 | } | |
1175 | ||
1176 | #ifdef CONFIG_IP_MULTICAST | |
1177 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1178 | return; | |
1179 | ||
1180 | if (in_dev->dead) | |
1181 | return; | |
1182 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1183 | spin_lock_bh(&im->lock); | |
1184 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1185 | spin_unlock_bh(&im->lock); | |
1186 | return; | |
1187 | } | |
1188 | /* else, v3 */ | |
1189 | ||
1190 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1191 | IGMP_Unsolicited_Report_Count; | |
1192 | igmp_ifc_event(in_dev); | |
1193 | #endif | |
1194 | } | |
1195 | ||
1196 | ||
1197 | /* | |
1198 | * Multicast list managers | |
1199 | */ | |
1200 | ||
1201 | ||
1202 | /* | |
1203 | * A socket has joined a multicast group on device dev. | |
1204 | */ | |
1205 | ||
8f935bbd | 1206 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1207 | { |
1208 | struct ip_mc_list *im; | |
1209 | ||
1210 | ASSERT_RTNL(); | |
1211 | ||
1212 | for (im=in_dev->mc_list; im; im=im->next) { | |
1213 | if (im->multiaddr == addr) { | |
1214 | im->users++; | |
1215 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1216 | goto out; | |
1217 | } | |
1218 | } | |
1219 | ||
8b3a7005 | 1220 | im = kmalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1221 | if (!im) |
1222 | goto out; | |
1223 | ||
a7e9ff73 JK |
1224 | im->users = 1; |
1225 | im->interface = in_dev; | |
1da177e4 | 1226 | in_dev_hold(in_dev); |
a7e9ff73 | 1227 | im->multiaddr = addr; |
1da177e4 LT |
1228 | /* initial mode is (EX, empty) */ |
1229 | im->sfmode = MCAST_EXCLUDE; | |
1230 | im->sfcount[MCAST_INCLUDE] = 0; | |
1231 | im->sfcount[MCAST_EXCLUDE] = 1; | |
1232 | im->sources = NULL; | |
1233 | im->tomb = NULL; | |
1234 | im->crcount = 0; | |
1235 | atomic_set(&im->refcnt, 1); | |
1236 | spin_lock_init(&im->lock); | |
1237 | #ifdef CONFIG_IP_MULTICAST | |
a7e9ff73 | 1238 | im->tm_running = 0; |
b24b8a24 | 1239 | setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); |
1da177e4 LT |
1240 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; |
1241 | im->reporter = 0; | |
1242 | im->gsquery = 0; | |
1243 | #endif | |
1244 | im->loaded = 0; | |
1245 | write_lock_bh(&in_dev->mc_list_lock); | |
a7e9ff73 JK |
1246 | im->next = in_dev->mc_list; |
1247 | in_dev->mc_list = im; | |
b8bae41e | 1248 | in_dev->mc_count++; |
1da177e4 LT |
1249 | write_unlock_bh(&in_dev->mc_list_lock); |
1250 | #ifdef CONFIG_IP_MULTICAST | |
1251 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1252 | #endif | |
1253 | igmp_group_added(im); | |
1254 | if (!in_dev->dead) | |
1255 | ip_rt_multicast_event(in_dev); | |
1256 | out: | |
1257 | return; | |
1258 | } | |
4bc2f18b | 1259 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1260 | |
a816c7c7 JV |
1261 | /* |
1262 | * Resend IGMP JOIN report; used for bonding. | |
1263 | */ | |
1264 | void ip_mc_rejoin_group(struct ip_mc_list *im) | |
1265 | { | |
08882669 | 1266 | #ifdef CONFIG_IP_MULTICAST |
a816c7c7 JV |
1267 | struct in_device *in_dev = im->interface; |
1268 | ||
a816c7c7 JV |
1269 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1270 | return; | |
1271 | ||
e12b4539 FL |
1272 | /* a failover is happening and switches |
1273 | * must be notified immediately */ | |
1274 | if (IGMP_V1_SEEN(in_dev)) | |
1275 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
1276 | else if (IGMP_V2_SEEN(in_dev)) | |
1277 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
1278 | else | |
1279 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
a816c7c7 JV |
1280 | #endif |
1281 | } | |
4bc2f18b | 1282 | EXPORT_SYMBOL(ip_mc_rejoin_group); |
a816c7c7 | 1283 | |
1da177e4 LT |
1284 | /* |
1285 | * A socket has left a multicast group on device dev | |
1286 | */ | |
1287 | ||
8f935bbd | 1288 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1289 | { |
1290 | struct ip_mc_list *i, **ip; | |
e905a9ed | 1291 | |
1da177e4 | 1292 | ASSERT_RTNL(); |
e905a9ed | 1293 | |
1da177e4 | 1294 | for (ip=&in_dev->mc_list; (i=*ip)!=NULL; ip=&i->next) { |
a7e9ff73 | 1295 | if (i->multiaddr == addr) { |
1da177e4 LT |
1296 | if (--i->users == 0) { |
1297 | write_lock_bh(&in_dev->mc_list_lock); | |
1298 | *ip = i->next; | |
b8bae41e | 1299 | in_dev->mc_count--; |
1da177e4 LT |
1300 | write_unlock_bh(&in_dev->mc_list_lock); |
1301 | igmp_group_dropped(i); | |
1302 | ||
1303 | if (!in_dev->dead) | |
1304 | ip_rt_multicast_event(in_dev); | |
1305 | ||
1306 | ip_ma_put(i); | |
1307 | return; | |
1308 | } | |
1309 | break; | |
1310 | } | |
1311 | } | |
1312 | } | |
4bc2f18b | 1313 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1314 | |
75c78500 MS |
1315 | /* Device changing type */ |
1316 | ||
1317 | void ip_mc_unmap(struct in_device *in_dev) | |
1318 | { | |
1319 | struct ip_mc_list *i; | |
1320 | ||
1321 | ASSERT_RTNL(); | |
1322 | ||
1323 | for (i = in_dev->mc_list; i; i = i->next) | |
1324 | igmp_group_dropped(i); | |
1325 | } | |
1326 | ||
1327 | void ip_mc_remap(struct in_device *in_dev) | |
1328 | { | |
1329 | struct ip_mc_list *i; | |
1330 | ||
1331 | ASSERT_RTNL(); | |
1332 | ||
1333 | for (i = in_dev->mc_list; i; i = i->next) | |
1334 | igmp_group_added(i); | |
1335 | } | |
1336 | ||
1da177e4 LT |
1337 | /* Device going down */ |
1338 | ||
1339 | void ip_mc_down(struct in_device *in_dev) | |
1340 | { | |
1341 | struct ip_mc_list *i; | |
1342 | ||
1343 | ASSERT_RTNL(); | |
1344 | ||
1345 | for (i=in_dev->mc_list; i; i=i->next) | |
1346 | igmp_group_dropped(i); | |
1347 | ||
1348 | #ifdef CONFIG_IP_MULTICAST | |
1349 | in_dev->mr_ifc_count = 0; | |
1350 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1351 | __in_dev_put(in_dev); | |
1352 | in_dev->mr_gq_running = 0; | |
1353 | if (del_timer(&in_dev->mr_gq_timer)) | |
1354 | __in_dev_put(in_dev); | |
1355 | igmpv3_clear_delrec(in_dev); | |
1356 | #endif | |
1357 | ||
1358 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1359 | } | |
1360 | ||
1361 | void ip_mc_init_dev(struct in_device *in_dev) | |
1362 | { | |
1363 | ASSERT_RTNL(); | |
1364 | ||
1365 | in_dev->mc_tomb = NULL; | |
1366 | #ifdef CONFIG_IP_MULTICAST | |
1367 | in_dev->mr_gq_running = 0; | |
b24b8a24 PE |
1368 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1369 | (unsigned long)in_dev); | |
1da177e4 | 1370 | in_dev->mr_ifc_count = 0; |
b8bae41e | 1371 | in_dev->mc_count = 0; |
b24b8a24 PE |
1372 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1373 | (unsigned long)in_dev); | |
1da177e4 LT |
1374 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; |
1375 | #endif | |
1376 | ||
1377 | rwlock_init(&in_dev->mc_list_lock); | |
1378 | spin_lock_init(&in_dev->mc_tomb_lock); | |
1379 | } | |
1380 | ||
1381 | /* Device going up */ | |
1382 | ||
1383 | void ip_mc_up(struct in_device *in_dev) | |
1384 | { | |
1385 | struct ip_mc_list *i; | |
1386 | ||
1387 | ASSERT_RTNL(); | |
1388 | ||
1389 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1390 | ||
1391 | for (i=in_dev->mc_list; i; i=i->next) | |
1392 | igmp_group_added(i); | |
1393 | } | |
1394 | ||
1395 | /* | |
1396 | * Device is about to be destroyed: clean up. | |
1397 | */ | |
1398 | ||
1399 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1400 | { | |
1401 | struct ip_mc_list *i; | |
1402 | ||
1403 | ASSERT_RTNL(); | |
1404 | ||
1405 | /* Deactivate timers */ | |
1406 | ip_mc_down(in_dev); | |
1407 | ||
1408 | write_lock_bh(&in_dev->mc_list_lock); | |
1409 | while ((i = in_dev->mc_list) != NULL) { | |
1410 | in_dev->mc_list = i->next; | |
b8bae41e | 1411 | in_dev->mc_count--; |
1da177e4 | 1412 | write_unlock_bh(&in_dev->mc_list_lock); |
1da177e4 LT |
1413 | igmp_group_dropped(i); |
1414 | ip_ma_put(i); | |
1415 | ||
1416 | write_lock_bh(&in_dev->mc_list_lock); | |
1417 | } | |
1418 | write_unlock_bh(&in_dev->mc_list_lock); | |
1419 | } | |
1420 | ||
9e917dca | 1421 | /* RTNL is locked */ |
877acedc | 1422 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 LT |
1423 | { |
1424 | struct flowi fl = { .nl_u = { .ip4_u = | |
1425 | { .daddr = imr->imr_multiaddr.s_addr } } }; | |
1426 | struct rtable *rt; | |
1427 | struct net_device *dev = NULL; | |
1428 | struct in_device *idev = NULL; | |
1429 | ||
1430 | if (imr->imr_ifindex) { | |
877acedc | 1431 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1432 | return idev; |
1433 | } | |
1434 | if (imr->imr_address.s_addr) { | |
9e917dca | 1435 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1436 | if (!dev) |
1437 | return NULL; | |
1da177e4 LT |
1438 | } |
1439 | ||
877acedc | 1440 | if (!dev && !ip_route_output_key(net, &rt, &fl)) { |
d8d1f30b | 1441 | dev = rt->dst.dev; |
1da177e4 LT |
1442 | ip_rt_put(rt); |
1443 | } | |
1444 | if (dev) { | |
1445 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1446 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1447 | } |
1448 | return idev; | |
1449 | } | |
1450 | ||
1451 | /* | |
1452 | * Join a socket to a group | |
1453 | */ | |
ab32ea5d BH |
1454 | int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; |
1455 | int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; | |
1da177e4 LT |
1456 | |
1457 | ||
1458 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1459 | __be32 *psfsrc) |
1da177e4 LT |
1460 | { |
1461 | struct ip_sf_list *psf, *psf_prev; | |
1462 | int rv = 0; | |
1463 | ||
1464 | psf_prev = NULL; | |
1465 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1466 | if (psf->sf_inaddr == *psfsrc) | |
1467 | break; | |
1468 | psf_prev = psf; | |
1469 | } | |
1470 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1471 | /* source filter not found, or count wrong => bug */ | |
1472 | return -ESRCH; | |
1473 | } | |
1474 | psf->sf_count[sfmode]--; | |
1475 | if (psf->sf_count[sfmode] == 0) { | |
1476 | ip_rt_multicast_event(pmc->interface); | |
1477 | } | |
1478 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1479 | #ifdef CONFIG_IP_MULTICAST | |
1480 | struct in_device *in_dev = pmc->interface; | |
1481 | #endif | |
1482 | ||
1483 | /* no more filters for this source */ | |
1484 | if (psf_prev) | |
1485 | psf_prev->sf_next = psf->sf_next; | |
1486 | else | |
1487 | pmc->sources = psf->sf_next; | |
1488 | #ifdef CONFIG_IP_MULTICAST | |
1489 | if (psf->sf_oldin && | |
1490 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
e905a9ed | 1491 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1492 | IGMP_Unsolicited_Report_Count; |
1493 | psf->sf_next = pmc->tomb; | |
1494 | pmc->tomb = psf; | |
1495 | rv = 1; | |
1496 | } else | |
1497 | #endif | |
1498 | kfree(psf); | |
1499 | } | |
1500 | return rv; | |
1501 | } | |
1502 | ||
1503 | #ifndef CONFIG_IP_MULTICAST | |
1504 | #define igmp_ifc_event(x) do { } while (0) | |
1505 | #endif | |
1506 | ||
8f935bbd AV |
1507 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1508 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1509 | { |
1510 | struct ip_mc_list *pmc; | |
1511 | int changerec = 0; | |
1512 | int i, err; | |
1513 | ||
1514 | if (!in_dev) | |
1515 | return -ENODEV; | |
1516 | read_lock(&in_dev->mc_list_lock); | |
1517 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1518 | if (*pmca == pmc->multiaddr) | |
1519 | break; | |
1520 | } | |
1521 | if (!pmc) { | |
1522 | /* MCA not found?? bug */ | |
1523 | read_unlock(&in_dev->mc_list_lock); | |
1524 | return -ESRCH; | |
1525 | } | |
1526 | spin_lock_bh(&pmc->lock); | |
1527 | read_unlock(&in_dev->mc_list_lock); | |
1528 | #ifdef CONFIG_IP_MULTICAST | |
1529 | sf_markstate(pmc); | |
1530 | #endif | |
1531 | if (!delta) { | |
1532 | err = -EINVAL; | |
1533 | if (!pmc->sfcount[sfmode]) | |
1534 | goto out_unlock; | |
1535 | pmc->sfcount[sfmode]--; | |
1536 | } | |
1537 | err = 0; | |
1538 | for (i=0; i<sfcount; i++) { | |
1539 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1540 | ||
1541 | changerec |= rv > 0; | |
1542 | if (!err && rv < 0) | |
1543 | err = rv; | |
1544 | } | |
1545 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1546 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1547 | pmc->sfcount[MCAST_INCLUDE]) { | |
1548 | #ifdef CONFIG_IP_MULTICAST | |
1549 | struct ip_sf_list *psf; | |
1550 | #endif | |
1551 | ||
1552 | /* filter mode change */ | |
1553 | pmc->sfmode = MCAST_INCLUDE; | |
1554 | #ifdef CONFIG_IP_MULTICAST | |
e905a9ed | 1555 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1556 | IGMP_Unsolicited_Report_Count; |
1557 | in_dev->mr_ifc_count = pmc->crcount; | |
1558 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1559 | psf->sf_crcount = 0; | |
1560 | igmp_ifc_event(pmc->interface); | |
1561 | } else if (sf_setstate(pmc) || changerec) { | |
1562 | igmp_ifc_event(pmc->interface); | |
1563 | #endif | |
1564 | } | |
1565 | out_unlock: | |
1566 | spin_unlock_bh(&pmc->lock); | |
1567 | return err; | |
1568 | } | |
1569 | ||
1570 | /* | |
1571 | * Add multicast single-source filter to the interface list | |
1572 | */ | |
1573 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1574 | __be32 *psfsrc, int delta) |
1da177e4 LT |
1575 | { |
1576 | struct ip_sf_list *psf, *psf_prev; | |
1577 | ||
1578 | psf_prev = NULL; | |
1579 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1580 | if (psf->sf_inaddr == *psfsrc) | |
1581 | break; | |
1582 | psf_prev = psf; | |
1583 | } | |
1584 | if (!psf) { | |
0da974f4 | 1585 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1586 | if (!psf) |
1587 | return -ENOBUFS; | |
1da177e4 LT |
1588 | psf->sf_inaddr = *psfsrc; |
1589 | if (psf_prev) { | |
1590 | psf_prev->sf_next = psf; | |
1591 | } else | |
1592 | pmc->sources = psf; | |
1593 | } | |
1594 | psf->sf_count[sfmode]++; | |
1595 | if (psf->sf_count[sfmode] == 1) { | |
1596 | ip_rt_multicast_event(pmc->interface); | |
1597 | } | |
1598 | return 0; | |
1599 | } | |
1600 | ||
1601 | #ifdef CONFIG_IP_MULTICAST | |
1602 | static void sf_markstate(struct ip_mc_list *pmc) | |
1603 | { | |
1604 | struct ip_sf_list *psf; | |
1605 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1606 | ||
1607 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1608 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1609 | psf->sf_oldin = mca_xcount == | |
1610 | psf->sf_count[MCAST_EXCLUDE] && | |
1611 | !psf->sf_count[MCAST_INCLUDE]; | |
1612 | } else | |
1613 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1614 | } | |
1615 | ||
1616 | static int sf_setstate(struct ip_mc_list *pmc) | |
1617 | { | |
ad12583f | 1618 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1619 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1620 | int qrv = pmc->interface->mr_qrv; | |
1621 | int new_in, rv; | |
1622 | ||
1623 | rv = 0; | |
1624 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1625 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1626 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1627 | !psf->sf_count[MCAST_INCLUDE]; | |
1628 | } else | |
1629 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1630 | if (new_in) { |
1631 | if (!psf->sf_oldin) { | |
76edc605 | 1632 | struct ip_sf_list *prev = NULL; |
ad12583f DS |
1633 | |
1634 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { | |
1635 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1636 | break; | |
1637 | prev = dpsf; | |
1638 | } | |
1639 | if (dpsf) { | |
1640 | if (prev) | |
1641 | prev->sf_next = dpsf->sf_next; | |
1642 | else | |
1643 | pmc->tomb = dpsf->sf_next; | |
1644 | kfree(dpsf); | |
1645 | } | |
1646 | psf->sf_crcount = qrv; | |
1647 | rv++; | |
1648 | } | |
1649 | } else if (psf->sf_oldin) { | |
1650 | ||
1651 | psf->sf_crcount = 0; | |
1652 | /* | |
1653 | * add or update "delete" records if an active filter | |
1654 | * is now inactive | |
1655 | */ | |
1656 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) | |
1657 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1658 | break; | |
1659 | if (!dpsf) { | |
3ed37a6f | 1660 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1661 | if (!dpsf) |
1662 | continue; | |
1663 | *dpsf = *psf; | |
1664 | /* pmc->lock held by callers */ | |
1665 | dpsf->sf_next = pmc->tomb; | |
1666 | pmc->tomb = dpsf; | |
1667 | } | |
1668 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1669 | rv++; |
1670 | } | |
1671 | } | |
1672 | return rv; | |
1673 | } | |
1674 | #endif | |
1675 | ||
1676 | /* | |
1677 | * Add multicast source filter list to the interface list | |
1678 | */ | |
8f935bbd AV |
1679 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1680 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1681 | { |
1682 | struct ip_mc_list *pmc; | |
1683 | int isexclude; | |
1684 | int i, err; | |
1685 | ||
1686 | if (!in_dev) | |
1687 | return -ENODEV; | |
1688 | read_lock(&in_dev->mc_list_lock); | |
1689 | for (pmc=in_dev->mc_list; pmc; pmc=pmc->next) { | |
1690 | if (*pmca == pmc->multiaddr) | |
1691 | break; | |
1692 | } | |
1693 | if (!pmc) { | |
1694 | /* MCA not found?? bug */ | |
1695 | read_unlock(&in_dev->mc_list_lock); | |
1696 | return -ESRCH; | |
1697 | } | |
1698 | spin_lock_bh(&pmc->lock); | |
1699 | read_unlock(&in_dev->mc_list_lock); | |
1700 | ||
1701 | #ifdef CONFIG_IP_MULTICAST | |
1702 | sf_markstate(pmc); | |
1703 | #endif | |
1704 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1705 | if (!delta) | |
1706 | pmc->sfcount[sfmode]++; | |
1707 | err = 0; | |
1708 | for (i=0; i<sfcount; i++) { | |
1709 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); | |
1710 | if (err) | |
1711 | break; | |
1712 | } | |
1713 | if (err) { | |
1714 | int j; | |
1715 | ||
1716 | pmc->sfcount[sfmode]--; | |
1717 | for (j=0; j<i; j++) | |
1718 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1719 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { | |
1720 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 1721 | struct ip_sf_list *psf; |
cfcabdcc | 1722 | in_dev = pmc->interface; |
1da177e4 LT |
1723 | #endif |
1724 | ||
1725 | /* filter mode change */ | |
1726 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1727 | pmc->sfmode = MCAST_EXCLUDE; | |
1728 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1729 | pmc->sfmode = MCAST_INCLUDE; | |
1730 | #ifdef CONFIG_IP_MULTICAST | |
1731 | /* else no filters; keep old mode for reports */ | |
1732 | ||
e905a9ed | 1733 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1734 | IGMP_Unsolicited_Report_Count; |
1735 | in_dev->mr_ifc_count = pmc->crcount; | |
1736 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1737 | psf->sf_crcount = 0; | |
1738 | igmp_ifc_event(in_dev); | |
1739 | } else if (sf_setstate(pmc)) { | |
1740 | igmp_ifc_event(in_dev); | |
1741 | #endif | |
1742 | } | |
1743 | spin_unlock_bh(&pmc->lock); | |
1744 | return err; | |
1745 | } | |
1746 | ||
1747 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1748 | { | |
1749 | struct ip_sf_list *psf, *nextpsf; | |
1750 | ||
1751 | for (psf=pmc->tomb; psf; psf=nextpsf) { | |
1752 | nextpsf = psf->sf_next; | |
1753 | kfree(psf); | |
1754 | } | |
1755 | pmc->tomb = NULL; | |
1756 | for (psf=pmc->sources; psf; psf=nextpsf) { | |
1757 | nextpsf = psf->sf_next; | |
1758 | kfree(psf); | |
1759 | } | |
1760 | pmc->sources = NULL; | |
1761 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1762 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1763 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1764 | } | |
1765 | ||
1766 | ||
1767 | /* | |
1768 | * Join a multicast group | |
1769 | */ | |
1770 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1771 | { | |
1772 | int err; | |
8f935bbd | 1773 | __be32 addr = imr->imr_multiaddr.s_addr; |
a7e9ff73 | 1774 | struct ip_mc_socklist *iml = NULL, *i; |
1da177e4 LT |
1775 | struct in_device *in_dev; |
1776 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 1777 | struct net *net = sock_net(sk); |
ca9b907d | 1778 | int ifindex; |
1da177e4 LT |
1779 | int count = 0; |
1780 | ||
f97c1e0c | 1781 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1782 | return -EINVAL; |
1783 | ||
6756ae4b | 1784 | rtnl_lock(); |
1da177e4 | 1785 | |
877acedc | 1786 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
1787 | |
1788 | if (!in_dev) { | |
1789 | iml = NULL; | |
1790 | err = -ENODEV; | |
1791 | goto done; | |
1792 | } | |
1793 | ||
1da177e4 | 1794 | err = -EADDRINUSE; |
ca9b907d | 1795 | ifindex = imr->imr_ifindex; |
1da177e4 | 1796 | for (i = inet->mc_list; i; i = i->next) { |
ca9b907d DS |
1797 | if (i->multi.imr_multiaddr.s_addr == addr && |
1798 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1799 | goto done; |
1da177e4 LT |
1800 | count++; |
1801 | } | |
1802 | err = -ENOBUFS; | |
ca9b907d DS |
1803 | if (count >= sysctl_igmp_max_memberships) |
1804 | goto done; | |
a7e9ff73 | 1805 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
ca9b907d | 1806 | if (iml == NULL) |
1da177e4 | 1807 | goto done; |
ca9b907d | 1808 | |
1da177e4 LT |
1809 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1810 | iml->next = inet->mc_list; | |
1da177e4 LT |
1811 | iml->sflist = NULL; |
1812 | iml->sfmode = MCAST_EXCLUDE; | |
c85bb41e | 1813 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 1814 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 1815 | err = 0; |
1da177e4 | 1816 | done: |
6756ae4b | 1817 | rtnl_unlock(); |
1da177e4 LT |
1818 | return err; |
1819 | } | |
4bc2f18b | 1820 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 | 1821 | |
c85bb41e FL |
1822 | static void ip_sf_socklist_reclaim(struct rcu_head *rp) |
1823 | { | |
1824 | struct ip_sf_socklist *psf; | |
1825 | ||
1826 | psf = container_of(rp, struct ip_sf_socklist, rcu); | |
1827 | /* sk_omem_alloc should have been decreased by the caller*/ | |
1828 | kfree(psf); | |
1829 | } | |
1830 | ||
1da177e4 LT |
1831 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, |
1832 | struct in_device *in_dev) | |
1833 | { | |
c85bb41e | 1834 | struct ip_sf_socklist *psf = iml->sflist; |
1da177e4 LT |
1835 | int err; |
1836 | ||
c85bb41e | 1837 | if (psf == NULL) { |
1da177e4 LT |
1838 | /* any-source empty exclude case */ |
1839 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1840 | iml->sfmode, 0, NULL, 0); | |
1841 | } | |
1842 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e FL |
1843 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
1844 | rcu_assign_pointer(iml->sflist, NULL); | |
1845 | /* decrease mem now to avoid the memleak warning */ | |
1846 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
1847 | call_rcu(&psf->rcu, ip_sf_socklist_reclaim); | |
1da177e4 LT |
1848 | return err; |
1849 | } | |
1850 | ||
c85bb41e FL |
1851 | |
1852 | static void ip_mc_socklist_reclaim(struct rcu_head *rp) | |
1853 | { | |
1854 | struct ip_mc_socklist *iml; | |
1855 | ||
1856 | iml = container_of(rp, struct ip_mc_socklist, rcu); | |
1857 | /* sk_omem_alloc should have been decreased by the caller*/ | |
1858 | kfree(iml); | |
1859 | } | |
1860 | ||
1861 | ||
1da177e4 LT |
1862 | /* |
1863 | * Ask a socket to leave a group. | |
1864 | */ | |
1865 | ||
1866 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1867 | { | |
1868 | struct inet_sock *inet = inet_sk(sk); | |
1869 | struct ip_mc_socklist *iml, **imlp; | |
84b42bae | 1870 | struct in_device *in_dev; |
877acedc | 1871 | struct net *net = sock_net(sk); |
8f935bbd | 1872 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 1873 | u32 ifindex; |
acd6e00b | 1874 | int ret = -EADDRNOTAVAIL; |
1da177e4 LT |
1875 | |
1876 | rtnl_lock(); | |
877acedc | 1877 | in_dev = ip_mc_find_dev(net, imr); |
84b42bae | 1878 | ifindex = imr->imr_ifindex; |
1da177e4 | 1879 | for (imlp = &inet->mc_list; (iml = *imlp) != NULL; imlp = &iml->next) { |
acd6e00b DS |
1880 | if (iml->multi.imr_multiaddr.s_addr != group) |
1881 | continue; | |
1882 | if (ifindex) { | |
1883 | if (iml->multi.imr_ifindex != ifindex) | |
1884 | continue; | |
1885 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
1886 | iml->multi.imr_address.s_addr) | |
1887 | continue; | |
1da177e4 | 1888 | |
acd6e00b | 1889 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 1890 | |
c85bb41e | 1891 | rcu_assign_pointer(*imlp, iml->next); |
acd6e00b DS |
1892 | |
1893 | if (in_dev) | |
84b42bae | 1894 | ip_mc_dec_group(in_dev, group); |
acd6e00b | 1895 | rtnl_unlock(); |
c85bb41e FL |
1896 | /* decrease mem now to avoid the memleak warning */ |
1897 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
1898 | call_rcu(&iml->rcu, ip_mc_socklist_reclaim); | |
acd6e00b | 1899 | return 0; |
1da177e4 | 1900 | } |
acd6e00b DS |
1901 | if (!in_dev) |
1902 | ret = -ENODEV; | |
1da177e4 | 1903 | rtnl_unlock(); |
acd6e00b | 1904 | return ret; |
1da177e4 LT |
1905 | } |
1906 | ||
1907 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1908 | ip_mreq_source *mreqs, int ifindex) | |
1909 | { | |
1910 | int err; | |
1911 | struct ip_mreqn imr; | |
63007727 | 1912 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
1913 | struct ip_mc_socklist *pmc; |
1914 | struct in_device *in_dev = NULL; | |
1915 | struct inet_sock *inet = inet_sk(sk); | |
1916 | struct ip_sf_socklist *psl; | |
877acedc | 1917 | struct net *net = sock_net(sk); |
8cdaaa15 | 1918 | int leavegroup = 0; |
1da177e4 LT |
1919 | int i, j, rv; |
1920 | ||
f97c1e0c | 1921 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1922 | return -EINVAL; |
1923 | ||
6756ae4b | 1924 | rtnl_lock(); |
1da177e4 LT |
1925 | |
1926 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1927 | imr.imr_address.s_addr = mreqs->imr_interface; | |
1928 | imr.imr_ifindex = ifindex; | |
877acedc | 1929 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
1930 | |
1931 | if (!in_dev) { | |
1932 | err = -ENODEV; | |
1933 | goto done; | |
1934 | } | |
1935 | err = -EADDRNOTAVAIL; | |
1936 | ||
1937 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
f64f9e71 JP |
1938 | if ((pmc->multi.imr_multiaddr.s_addr == |
1939 | imr.imr_multiaddr.s_addr) && | |
1940 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
1941 | break; |
1942 | } | |
917f2f10 DS |
1943 | if (!pmc) { /* must have a prior join */ |
1944 | err = -EINVAL; | |
1da177e4 | 1945 | goto done; |
917f2f10 | 1946 | } |
1da177e4 LT |
1947 | /* if a source filter was set, must be the same mode as before */ |
1948 | if (pmc->sflist) { | |
917f2f10 DS |
1949 | if (pmc->sfmode != omode) { |
1950 | err = -EINVAL; | |
1da177e4 | 1951 | goto done; |
917f2f10 | 1952 | } |
1da177e4 LT |
1953 | } else if (pmc->sfmode != omode) { |
1954 | /* allow mode switches for empty-set filters */ | |
1955 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 1956 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
1957 | NULL, 0); |
1958 | pmc->sfmode = omode; | |
1959 | } | |
1960 | ||
1961 | psl = pmc->sflist; | |
1962 | if (!add) { | |
1963 | if (!psl) | |
917f2f10 | 1964 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 LT |
1965 | rv = !0; |
1966 | for (i=0; i<psl->sl_count; i++) { | |
1967 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 1968 | sizeof(__be32)); |
1da177e4 LT |
1969 | if (rv == 0) |
1970 | break; | |
1971 | } | |
1972 | if (rv) /* source not found */ | |
917f2f10 | 1973 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 1974 | |
8cdaaa15 DS |
1975 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1976 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
1977 | leavegroup = 1; | |
1978 | goto done; | |
1979 | } | |
1980 | ||
1da177e4 | 1981 | /* update the interface filter */ |
e905a9ed | 1982 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
1983 | &mreqs->imr_sourceaddr, 1); |
1984 | ||
1985 | for (j=i+1; j<psl->sl_count; j++) | |
1986 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
1987 | psl->sl_count--; | |
1988 | err = 0; | |
1989 | goto done; | |
1990 | } | |
1991 | /* else, add a new source to the filter */ | |
1992 | ||
1993 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
1994 | err = -ENOBUFS; | |
1995 | goto done; | |
1996 | } | |
1997 | if (!psl || psl->sl_count == psl->sl_max) { | |
1998 | struct ip_sf_socklist *newpsl; | |
1999 | int count = IP_SFBLOCK; | |
2000 | ||
2001 | if (psl) | |
2002 | count += psl->sl_max; | |
8b3a7005 | 2003 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2004 | if (!newpsl) { |
2005 | err = -ENOBUFS; | |
2006 | goto done; | |
2007 | } | |
2008 | newpsl->sl_max = count; | |
2009 | newpsl->sl_count = count - IP_SFBLOCK; | |
2010 | if (psl) { | |
2011 | for (i=0; i<psl->sl_count; i++) | |
2012 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
c85bb41e FL |
2013 | /* decrease mem now to avoid the memleak warning */ |
2014 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
2015 | call_rcu(&psl->rcu, ip_sf_socklist_reclaim); | |
1da177e4 | 2016 | } |
c85bb41e FL |
2017 | rcu_assign_pointer(pmc->sflist, newpsl); |
2018 | psl = newpsl; | |
1da177e4 LT |
2019 | } |
2020 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
2021 | for (i=0; i<psl->sl_count; i++) { | |
2022 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 2023 | sizeof(__be32)); |
1da177e4 LT |
2024 | if (rv == 0) |
2025 | break; | |
2026 | } | |
2027 | if (rv == 0) /* address already there is an error */ | |
2028 | goto done; | |
2029 | for (j=psl->sl_count-1; j>=i; j--) | |
2030 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
2031 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2032 | psl->sl_count++; | |
2033 | err = 0; | |
2034 | /* update the interface list */ | |
e905a9ed | 2035 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2036 | &mreqs->imr_sourceaddr, 1); |
2037 | done: | |
6756ae4b | 2038 | rtnl_unlock(); |
8cdaaa15 DS |
2039 | if (leavegroup) |
2040 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2041 | return err; |
2042 | } | |
2043 | ||
2044 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2045 | { | |
9951f036 | 2046 | int err = 0; |
1da177e4 | 2047 | struct ip_mreqn imr; |
63007727 | 2048 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2049 | struct ip_mc_socklist *pmc; |
2050 | struct in_device *in_dev; | |
2051 | struct inet_sock *inet = inet_sk(sk); | |
2052 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2053 | struct net *net = sock_net(sk); |
9951f036 | 2054 | int leavegroup = 0; |
1da177e4 | 2055 | |
f97c1e0c | 2056 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2057 | return -EINVAL; |
2058 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2059 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2060 | return -EINVAL; | |
2061 | ||
6756ae4b | 2062 | rtnl_lock(); |
1da177e4 LT |
2063 | |
2064 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2065 | imr.imr_address.s_addr = msf->imsf_interface; | |
2066 | imr.imr_ifindex = ifindex; | |
877acedc | 2067 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2068 | |
2069 | if (!in_dev) { | |
2070 | err = -ENODEV; | |
2071 | goto done; | |
2072 | } | |
1da177e4 | 2073 | |
9951f036 DS |
2074 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2075 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2076 | leavegroup = 1; | |
2077 | goto done; | |
2078 | } | |
2079 | ||
1da177e4 LT |
2080 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { |
2081 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
2082 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2083 | break; | |
2084 | } | |
917f2f10 DS |
2085 | if (!pmc) { /* must have a prior join */ |
2086 | err = -EINVAL; | |
1da177e4 | 2087 | goto done; |
917f2f10 | 2088 | } |
1da177e4 | 2089 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2090 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2091 | GFP_KERNEL); | |
1da177e4 LT |
2092 | if (!newpsl) { |
2093 | err = -ENOBUFS; | |
2094 | goto done; | |
2095 | } | |
2096 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2097 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2098 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2099 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2100 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2101 | if (err) { | |
2102 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2103 | goto done; | |
2104 | } | |
8713dbf0 | 2105 | } else { |
1da177e4 | 2106 | newpsl = NULL; |
8713dbf0 YZ |
2107 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2108 | msf->imsf_fmode, 0, NULL, 0); | |
2109 | } | |
1da177e4 LT |
2110 | psl = pmc->sflist; |
2111 | if (psl) { | |
2112 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2113 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2114 | /* decrease mem now to avoid the memleak warning */ |
2115 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
2116 | call_rcu(&psl->rcu, ip_sf_socklist_reclaim); | |
1da177e4 LT |
2117 | } else |
2118 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2119 | 0, NULL, 0); | |
c85bb41e | 2120 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2121 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2122 | err = 0; |
1da177e4 | 2123 | done: |
6756ae4b | 2124 | rtnl_unlock(); |
9951f036 DS |
2125 | if (leavegroup) |
2126 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2127 | return err; |
2128 | } | |
2129 | ||
2130 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2131 | struct ip_msfilter __user *optval, int __user *optlen) | |
2132 | { | |
2133 | int err, len, count, copycount; | |
2134 | struct ip_mreqn imr; | |
63007727 | 2135 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2136 | struct ip_mc_socklist *pmc; |
2137 | struct in_device *in_dev; | |
2138 | struct inet_sock *inet = inet_sk(sk); | |
2139 | struct ip_sf_socklist *psl; | |
877acedc | 2140 | struct net *net = sock_net(sk); |
1da177e4 | 2141 | |
f97c1e0c | 2142 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2143 | return -EINVAL; |
2144 | ||
6756ae4b | 2145 | rtnl_lock(); |
1da177e4 LT |
2146 | |
2147 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2148 | imr.imr_address.s_addr = msf->imsf_interface; | |
2149 | imr.imr_ifindex = 0; | |
877acedc | 2150 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2151 | |
2152 | if (!in_dev) { | |
2153 | err = -ENODEV; | |
2154 | goto done; | |
2155 | } | |
2156 | err = -EADDRNOTAVAIL; | |
2157 | ||
2158 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2159 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && | |
2160 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2161 | break; | |
2162 | } | |
2163 | if (!pmc) /* must have a prior join */ | |
2164 | goto done; | |
2165 | msf->imsf_fmode = pmc->sfmode; | |
2166 | psl = pmc->sflist; | |
6756ae4b | 2167 | rtnl_unlock(); |
1da177e4 LT |
2168 | if (!psl) { |
2169 | len = 0; | |
2170 | count = 0; | |
2171 | } else { | |
2172 | count = psl->sl_count; | |
2173 | } | |
2174 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2175 | len = copycount * sizeof(psl->sl_addr[0]); | |
2176 | msf->imsf_numsrc = count; | |
2177 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2178 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2179 | return -EFAULT; | |
2180 | } | |
2181 | if (len && | |
2182 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2183 | return -EFAULT; | |
2184 | return 0; | |
2185 | done: | |
6756ae4b | 2186 | rtnl_unlock(); |
1da177e4 LT |
2187 | return err; |
2188 | } | |
2189 | ||
2190 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2191 | struct group_filter __user *optval, int __user *optlen) | |
2192 | { | |
2193 | int err, i, count, copycount; | |
2194 | struct sockaddr_in *psin; | |
63007727 | 2195 | __be32 addr; |
1da177e4 LT |
2196 | struct ip_mc_socklist *pmc; |
2197 | struct inet_sock *inet = inet_sk(sk); | |
2198 | struct ip_sf_socklist *psl; | |
2199 | ||
2200 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2201 | if (psin->sin_family != AF_INET) | |
2202 | return -EINVAL; | |
2203 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2204 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2205 | return -EINVAL; |
2206 | ||
6756ae4b | 2207 | rtnl_lock(); |
1da177e4 LT |
2208 | |
2209 | err = -EADDRNOTAVAIL; | |
2210 | ||
2211 | for (pmc=inet->mc_list; pmc; pmc=pmc->next) { | |
2212 | if (pmc->multi.imr_multiaddr.s_addr == addr && | |
2213 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2214 | break; | |
2215 | } | |
2216 | if (!pmc) /* must have a prior join */ | |
2217 | goto done; | |
2218 | gsf->gf_fmode = pmc->sfmode; | |
2219 | psl = pmc->sflist; | |
6756ae4b | 2220 | rtnl_unlock(); |
1da177e4 LT |
2221 | count = psl ? psl->sl_count : 0; |
2222 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2223 | gsf->gf_numsrc = count; | |
2224 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2225 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2226 | return -EFAULT; | |
2227 | } | |
2228 | for (i=0; i<copycount; i++) { | |
1da177e4 LT |
2229 | struct sockaddr_storage ss; |
2230 | ||
2231 | psin = (struct sockaddr_in *)&ss; | |
2232 | memset(&ss, 0, sizeof(ss)); | |
2233 | psin->sin_family = AF_INET; | |
2234 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2235 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2236 | return -EFAULT; | |
2237 | } | |
2238 | return 0; | |
2239 | done: | |
6756ae4b | 2240 | rtnl_unlock(); |
1da177e4 LT |
2241 | return err; |
2242 | } | |
2243 | ||
2244 | /* | |
2245 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2246 | */ | |
c0cda068 | 2247 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2248 | { |
2249 | struct inet_sock *inet = inet_sk(sk); | |
2250 | struct ip_mc_socklist *pmc; | |
2251 | struct ip_sf_socklist *psl; | |
2252 | int i; | |
c85bb41e | 2253 | int ret; |
1da177e4 | 2254 | |
c85bb41e | 2255 | ret = 1; |
f97c1e0c | 2256 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2257 | goto out; |
1da177e4 | 2258 | |
c85bb41e FL |
2259 | rcu_read_lock(); |
2260 | for (pmc=rcu_dereference(inet->mc_list); pmc; pmc=rcu_dereference(pmc->next)) { | |
1da177e4 LT |
2261 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2262 | pmc->multi.imr_ifindex == dif) | |
2263 | break; | |
2264 | } | |
c85bb41e | 2265 | ret = inet->mc_all; |
1da177e4 | 2266 | if (!pmc) |
c85bb41e | 2267 | goto unlock; |
1da177e4 | 2268 | psl = pmc->sflist; |
c85bb41e | 2269 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2270 | if (!psl) |
c85bb41e | 2271 | goto unlock; |
1da177e4 LT |
2272 | |
2273 | for (i=0; i<psl->sl_count; i++) { | |
2274 | if (psl->sl_addr[i] == rmt_addr) | |
2275 | break; | |
2276 | } | |
c85bb41e | 2277 | ret = 0; |
1da177e4 | 2278 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2279 | goto unlock; |
1da177e4 | 2280 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2281 | goto unlock; |
2282 | ret = 1; | |
2283 | unlock: | |
2284 | rcu_read_unlock(); | |
2285 | out: | |
2286 | return ret; | |
1da177e4 LT |
2287 | } |
2288 | ||
2289 | /* | |
2290 | * A socket is closing. | |
2291 | */ | |
2292 | ||
2293 | void ip_mc_drop_socket(struct sock *sk) | |
2294 | { | |
2295 | struct inet_sock *inet = inet_sk(sk); | |
2296 | struct ip_mc_socklist *iml; | |
877acedc | 2297 | struct net *net = sock_net(sk); |
1da177e4 LT |
2298 | |
2299 | if (inet->mc_list == NULL) | |
2300 | return; | |
2301 | ||
2302 | rtnl_lock(); | |
2303 | while ((iml = inet->mc_list) != NULL) { | |
2304 | struct in_device *in_dev; | |
c85bb41e | 2305 | rcu_assign_pointer(inet->mc_list, iml->next); |
1da177e4 | 2306 | |
877acedc | 2307 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc MR |
2308 | (void) ip_mc_leave_src(sk, iml, in_dev); |
2309 | if (in_dev != NULL) { | |
1da177e4 LT |
2310 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
2311 | in_dev_put(in_dev); | |
2312 | } | |
c85bb41e FL |
2313 | /* decrease mem now to avoid the memleak warning */ |
2314 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
2315 | call_rcu(&iml->rcu, ip_mc_socklist_reclaim); | |
1da177e4 LT |
2316 | } |
2317 | rtnl_unlock(); | |
2318 | } | |
2319 | ||
a60c4923 | 2320 | int ip_check_mc(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) |
1da177e4 LT |
2321 | { |
2322 | struct ip_mc_list *im; | |
2323 | struct ip_sf_list *psf; | |
2324 | int rv = 0; | |
2325 | ||
2326 | read_lock(&in_dev->mc_list_lock); | |
2327 | for (im=in_dev->mc_list; im; im=im->next) { | |
2328 | if (im->multiaddr == mc_addr) | |
2329 | break; | |
2330 | } | |
2331 | if (im && proto == IPPROTO_IGMP) { | |
2332 | rv = 1; | |
2333 | } else if (im) { | |
2334 | if (src_addr) { | |
2335 | for (psf=im->sources; psf; psf=psf->sf_next) { | |
2336 | if (psf->sf_inaddr == src_addr) | |
2337 | break; | |
2338 | } | |
2339 | if (psf) | |
2340 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2341 | psf->sf_count[MCAST_EXCLUDE] != | |
2342 | im->sfcount[MCAST_EXCLUDE]; | |
2343 | else | |
2344 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2345 | } else | |
2346 | rv = 1; /* unspecified source; tentatively allow */ | |
2347 | } | |
2348 | read_unlock(&in_dev->mc_list_lock); | |
2349 | return rv; | |
2350 | } | |
2351 | ||
2352 | #if defined(CONFIG_PROC_FS) | |
2353 | struct igmp_mc_iter_state { | |
7091e728 | 2354 | struct seq_net_private p; |
1da177e4 LT |
2355 | struct net_device *dev; |
2356 | struct in_device *in_dev; | |
2357 | }; | |
2358 | ||
2359 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2360 | ||
2361 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2362 | { | |
7091e728 | 2363 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2364 | struct ip_mc_list *im = NULL; |
2365 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2366 | ||
7562f876 | 2367 | state->in_dev = NULL; |
61fbab77 | 2368 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2369 | struct in_device *in_dev; |
6baff150 ED |
2370 | |
2371 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2372 | if (!in_dev) |
2373 | continue; | |
2374 | read_lock(&in_dev->mc_list_lock); | |
2375 | im = in_dev->mc_list; | |
2376 | if (im) { | |
2377 | state->in_dev = in_dev; | |
2378 | break; | |
2379 | } | |
2380 | read_unlock(&in_dev->mc_list_lock); | |
1da177e4 LT |
2381 | } |
2382 | return im; | |
2383 | } | |
2384 | ||
2385 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2386 | { | |
2387 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2388 | im = im->next; | |
2389 | while (!im) { | |
6baff150 | 2390 | if (likely(state->in_dev != NULL)) |
1da177e4 | 2391 | read_unlock(&state->in_dev->mc_list_lock); |
6baff150 ED |
2392 | |
2393 | state->dev = next_net_device_rcu(state->dev); | |
1da177e4 LT |
2394 | if (!state->dev) { |
2395 | state->in_dev = NULL; | |
2396 | break; | |
2397 | } | |
6baff150 | 2398 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2399 | if (!state->in_dev) |
2400 | continue; | |
2401 | read_lock(&state->in_dev->mc_list_lock); | |
2402 | im = state->in_dev->mc_list; | |
2403 | } | |
2404 | return im; | |
2405 | } | |
2406 | ||
2407 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2408 | { | |
2409 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2410 | if (im) | |
2411 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2412 | --pos; | |
2413 | return pos ? NULL : im; | |
2414 | } | |
2415 | ||
2416 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2417 | __acquires(rcu) |
1da177e4 | 2418 | { |
61fbab77 | 2419 | rcu_read_lock(); |
1da177e4 LT |
2420 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2421 | } | |
2422 | ||
2423 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2424 | { | |
2425 | struct ip_mc_list *im; | |
2426 | if (v == SEQ_START_TOKEN) | |
2427 | im = igmp_mc_get_first(seq); | |
2428 | else | |
2429 | im = igmp_mc_get_next(seq, v); | |
2430 | ++*pos; | |
2431 | return im; | |
2432 | } | |
2433 | ||
2434 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2435 | __releases(rcu) |
1da177e4 LT |
2436 | { |
2437 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2438 | if (likely(state->in_dev != NULL)) { | |
2439 | read_unlock(&state->in_dev->mc_list_lock); | |
1da177e4 LT |
2440 | state->in_dev = NULL; |
2441 | } | |
2442 | state->dev = NULL; | |
61fbab77 | 2443 | rcu_read_unlock(); |
1da177e4 LT |
2444 | } |
2445 | ||
2446 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2447 | { | |
2448 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2449 | seq_puts(seq, |
1da177e4 LT |
2450 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2451 | else { | |
2452 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2453 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2454 | char *querier; | |
2455 | #ifdef CONFIG_IP_MULTICAST | |
2456 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2457 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2458 | "V3"; | |
2459 | #else | |
2460 | querier = "NONE"; | |
2461 | #endif | |
2462 | ||
2463 | if (state->in_dev->mc_list == im) { | |
2464 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", | |
b8bae41e | 2465 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2466 | } |
2467 | ||
2468 | seq_printf(seq, | |
338fcf98 | 2469 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 LT |
2470 | im->multiaddr, im->users, |
2471 | im->tm_running, im->tm_running ? | |
2472 | jiffies_to_clock_t(im->timer.expires-jiffies) : 0, | |
2473 | im->reporter); | |
2474 | } | |
2475 | return 0; | |
2476 | } | |
2477 | ||
f690808e | 2478 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2479 | .start = igmp_mc_seq_start, |
2480 | .next = igmp_mc_seq_next, | |
2481 | .stop = igmp_mc_seq_stop, | |
2482 | .show = igmp_mc_seq_show, | |
2483 | }; | |
2484 | ||
2485 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2486 | { | |
7091e728 | 2487 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2488 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2489 | } |
2490 | ||
9a32144e | 2491 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2492 | .owner = THIS_MODULE, |
2493 | .open = igmp_mc_seq_open, | |
2494 | .read = seq_read, | |
2495 | .llseek = seq_lseek, | |
7091e728 | 2496 | .release = seq_release_net, |
1da177e4 LT |
2497 | }; |
2498 | ||
2499 | struct igmp_mcf_iter_state { | |
7091e728 | 2500 | struct seq_net_private p; |
1da177e4 LT |
2501 | struct net_device *dev; |
2502 | struct in_device *idev; | |
2503 | struct ip_mc_list *im; | |
2504 | }; | |
2505 | ||
2506 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2507 | ||
2508 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2509 | { | |
7091e728 | 2510 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2511 | struct ip_sf_list *psf = NULL; |
2512 | struct ip_mc_list *im = NULL; | |
2513 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2514 | ||
7562f876 PE |
2515 | state->idev = NULL; |
2516 | state->im = NULL; | |
61fbab77 | 2517 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2518 | struct in_device *idev; |
6baff150 | 2519 | idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2520 | if (unlikely(idev == NULL)) |
2521 | continue; | |
2522 | read_lock(&idev->mc_list_lock); | |
2523 | im = idev->mc_list; | |
2524 | if (likely(im != NULL)) { | |
2525 | spin_lock_bh(&im->lock); | |
2526 | psf = im->sources; | |
2527 | if (likely(psf != NULL)) { | |
2528 | state->im = im; | |
2529 | state->idev = idev; | |
2530 | break; | |
2531 | } | |
2532 | spin_unlock_bh(&im->lock); | |
2533 | } | |
2534 | read_unlock(&idev->mc_list_lock); | |
1da177e4 LT |
2535 | } |
2536 | return psf; | |
2537 | } | |
2538 | ||
2539 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2540 | { | |
2541 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2542 | ||
2543 | psf = psf->sf_next; | |
2544 | while (!psf) { | |
2545 | spin_unlock_bh(&state->im->lock); | |
2546 | state->im = state->im->next; | |
2547 | while (!state->im) { | |
6baff150 | 2548 | if (likely(state->idev != NULL)) |
1da177e4 | 2549 | read_unlock(&state->idev->mc_list_lock); |
6baff150 ED |
2550 | |
2551 | state->dev = next_net_device_rcu(state->dev); | |
1da177e4 LT |
2552 | if (!state->dev) { |
2553 | state->idev = NULL; | |
2554 | goto out; | |
2555 | } | |
6baff150 | 2556 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2557 | if (!state->idev) |
2558 | continue; | |
2559 | read_lock(&state->idev->mc_list_lock); | |
2560 | state->im = state->idev->mc_list; | |
2561 | } | |
2562 | if (!state->im) | |
2563 | break; | |
2564 | spin_lock_bh(&state->im->lock); | |
2565 | psf = state->im->sources; | |
2566 | } | |
2567 | out: | |
2568 | return psf; | |
2569 | } | |
2570 | ||
2571 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2572 | { | |
2573 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2574 | if (psf) | |
2575 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2576 | --pos; | |
2577 | return pos ? NULL : psf; | |
2578 | } | |
2579 | ||
2580 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2581 | __acquires(rcu) |
1da177e4 | 2582 | { |
61fbab77 | 2583 | rcu_read_lock(); |
1da177e4 LT |
2584 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2585 | } | |
2586 | ||
2587 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2588 | { | |
2589 | struct ip_sf_list *psf; | |
2590 | if (v == SEQ_START_TOKEN) | |
2591 | psf = igmp_mcf_get_first(seq); | |
2592 | else | |
2593 | psf = igmp_mcf_get_next(seq, v); | |
2594 | ++*pos; | |
2595 | return psf; | |
2596 | } | |
2597 | ||
2598 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2599 | __releases(rcu) |
1da177e4 LT |
2600 | { |
2601 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2602 | if (likely(state->im != NULL)) { | |
2603 | spin_unlock_bh(&state->im->lock); | |
2604 | state->im = NULL; | |
2605 | } | |
2606 | if (likely(state->idev != NULL)) { | |
2607 | read_unlock(&state->idev->mc_list_lock); | |
1da177e4 LT |
2608 | state->idev = NULL; |
2609 | } | |
2610 | state->dev = NULL; | |
61fbab77 | 2611 | rcu_read_unlock(); |
1da177e4 LT |
2612 | } |
2613 | ||
2614 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2615 | { | |
2616 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2617 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2618 | ||
2619 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2620 | seq_printf(seq, |
1da177e4 LT |
2621 | "%3s %6s " |
2622 | "%10s %10s %6s %6s\n", "Idx", | |
2623 | "Device", "MCA", | |
2624 | "SRC", "INC", "EXC"); | |
2625 | } else { | |
2626 | seq_printf(seq, | |
2627 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2628 | "0x%08x %6lu %6lu\n", |
2629 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2630 | ntohl(state->im->multiaddr), |
2631 | ntohl(psf->sf_inaddr), | |
2632 | psf->sf_count[MCAST_INCLUDE], | |
2633 | psf->sf_count[MCAST_EXCLUDE]); | |
2634 | } | |
2635 | return 0; | |
2636 | } | |
2637 | ||
f690808e | 2638 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2639 | .start = igmp_mcf_seq_start, |
2640 | .next = igmp_mcf_seq_next, | |
2641 | .stop = igmp_mcf_seq_stop, | |
2642 | .show = igmp_mcf_seq_show, | |
2643 | }; | |
2644 | ||
2645 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2646 | { | |
7091e728 | 2647 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2648 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2649 | } |
2650 | ||
9a32144e | 2651 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2652 | .owner = THIS_MODULE, |
2653 | .open = igmp_mcf_seq_open, | |
2654 | .read = seq_read, | |
2655 | .llseek = seq_lseek, | |
7091e728 | 2656 | .release = seq_release_net, |
1da177e4 LT |
2657 | }; |
2658 | ||
2c8c1e72 | 2659 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2660 | { |
7091e728 AD |
2661 | struct proc_dir_entry *pde; |
2662 | ||
2663 | pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); | |
2664 | if (!pde) | |
2665 | goto out_igmp; | |
2666 | pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); | |
2667 | if (!pde) | |
2668 | goto out_mcfilter; | |
1da177e4 | 2669 | return 0; |
7091e728 AD |
2670 | |
2671 | out_mcfilter: | |
2672 | proc_net_remove(net, "igmp"); | |
2673 | out_igmp: | |
2674 | return -ENOMEM; | |
2675 | } | |
2676 | ||
2c8c1e72 | 2677 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 AD |
2678 | { |
2679 | proc_net_remove(net, "mcfilter"); | |
2680 | proc_net_remove(net, "igmp"); | |
2681 | } | |
2682 | ||
2683 | static struct pernet_operations igmp_net_ops = { | |
2684 | .init = igmp_net_init, | |
2685 | .exit = igmp_net_exit, | |
2686 | }; | |
2687 | ||
2688 | int __init igmp_mc_proc_init(void) | |
2689 | { | |
2690 | return register_pernet_subsys(&igmp_net_ops); | |
1da177e4 LT |
2691 | } |
2692 | #endif |