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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
1da177e4 | 75 | #include <asm/uaccess.h> |
1da177e4 LT |
76 | #include <linux/types.h> |
77 | #include <linux/kernel.h> | |
78 | #include <linux/jiffies.h> | |
79 | #include <linux/string.h> | |
80 | #include <linux/socket.h> | |
81 | #include <linux/sockios.h> | |
82 | #include <linux/in.h> | |
83 | #include <linux/inet.h> | |
84 | #include <linux/netdevice.h> | |
85 | #include <linux/skbuff.h> | |
86 | #include <linux/inetdevice.h> | |
87 | #include <linux/igmp.h> | |
88 | #include <linux/if_arp.h> | |
89 | #include <linux/rtnetlink.h> | |
90 | #include <linux/times.h> | |
14c85021 | 91 | |
457c4cbc | 92 | #include <net/net_namespace.h> |
14c85021 | 93 | #include <net/arp.h> |
1da177e4 LT |
94 | #include <net/ip.h> |
95 | #include <net/protocol.h> | |
96 | #include <net/route.h> | |
97 | #include <net/sock.h> | |
98 | #include <net/checksum.h> | |
99 | #include <linux/netfilter_ipv4.h> | |
100 | #ifdef CONFIG_IP_MROUTE | |
101 | #include <linux/mroute.h> | |
102 | #endif | |
103 | #ifdef CONFIG_PROC_FS | |
104 | #include <linux/proc_fs.h> | |
105 | #include <linux/seq_file.h> | |
106 | #endif | |
107 | ||
108 | #define IP_MAX_MEMBERSHIPS 20 | |
109 | #define IP_MAX_MSF 10 | |
110 | ||
111 | #ifdef CONFIG_IP_MULTICAST | |
112 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
113 | ||
114 | #define IGMP_V1_Router_Present_Timeout (400*HZ) | |
115 | #define IGMP_V2_Router_Present_Timeout (400*HZ) | |
116 | #define IGMP_Unsolicited_Report_Interval (10*HZ) | |
117 | #define IGMP_Query_Response_Interval (10*HZ) | |
118 | #define IGMP_Unsolicited_Report_Count 2 | |
119 | ||
120 | ||
121 | #define IGMP_Initial_Report_Delay (1) | |
122 | ||
123 | /* IGMP_Initial_Report_Delay is not from IGMP specs! | |
124 | * IGMP specs require to report membership immediately after | |
125 | * joining a group, but we delay the first report by a | |
126 | * small interval. It seems more natural and still does not | |
127 | * contradict to specs provided this delay is small enough. | |
128 | */ | |
129 | ||
42f811b8 | 130 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 131 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
132 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
133 | ((in_dev)->mr_v1_seen && \ | |
134 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
135 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 136 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
137 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
138 | ((in_dev)->mr_v2_seen && \ | |
139 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 LT |
140 | |
141 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); | |
63007727 | 142 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); |
1da177e4 LT |
143 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
144 | static int sf_setstate(struct ip_mc_list *pmc); | |
145 | static void sf_markstate(struct ip_mc_list *pmc); | |
146 | #endif | |
147 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
148 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
149 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
150 | |
151 | static void ip_ma_put(struct ip_mc_list *im) | |
152 | { | |
153 | if (atomic_dec_and_test(&im->refcnt)) { | |
154 | in_dev_put(im->interface); | |
42ea299d | 155 | kfree_rcu(im, rcu); |
1da177e4 LT |
156 | } |
157 | } | |
158 | ||
d9aa9380 DM |
159 | #define for_each_pmc_rcu(in_dev, pmc) \ |
160 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
161 | pmc != NULL; \ | |
162 | pmc = rcu_dereference(pmc->next_rcu)) | |
163 | ||
164 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
165 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
166 | pmc != NULL; \ | |
167 | pmc = rtnl_dereference(pmc->next_rcu)) | |
168 | ||
1da177e4 LT |
169 | #ifdef CONFIG_IP_MULTICAST |
170 | ||
171 | /* | |
172 | * Timer management | |
173 | */ | |
174 | ||
1d7138de | 175 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
176 | { |
177 | spin_lock_bh(&im->lock); | |
178 | if (del_timer(&im->timer)) | |
179 | atomic_dec(&im->refcnt); | |
a7e9ff73 | 180 | im->tm_running = 0; |
1da177e4 LT |
181 | im->reporter = 0; |
182 | im->unsolicit_count = 0; | |
183 | spin_unlock_bh(&im->lock); | |
184 | } | |
185 | ||
186 | /* It must be called with locked im->lock */ | |
187 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
188 | { | |
a7e9ff73 | 189 | int tv = net_random() % max_delay; |
1da177e4 | 190 | |
a7e9ff73 | 191 | im->tm_running = 1; |
1da177e4 LT |
192 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
193 | atomic_inc(&im->refcnt); | |
194 | } | |
195 | ||
196 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
197 | { | |
198 | int tv = net_random() % in_dev->mr_maxdelay; | |
199 | ||
200 | in_dev->mr_gq_running = 1; | |
201 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
202 | in_dev_hold(in_dev); | |
203 | } | |
204 | ||
205 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
206 | { | |
207 | int tv = net_random() % delay; | |
208 | ||
209 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
210 | in_dev_hold(in_dev); | |
211 | } | |
212 | ||
213 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
214 | { | |
215 | spin_lock_bh(&im->lock); | |
216 | im->unsolicit_count = 0; | |
217 | if (del_timer(&im->timer)) { | |
218 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
219 | add_timer(&im->timer); | |
a7e9ff73 | 220 | im->tm_running = 1; |
1da177e4 LT |
221 | spin_unlock_bh(&im->lock); |
222 | return; | |
223 | } | |
224 | atomic_dec(&im->refcnt); | |
225 | } | |
226 | igmp_start_timer(im, max_delay); | |
227 | spin_unlock_bh(&im->lock); | |
228 | } | |
229 | ||
230 | ||
231 | /* | |
232 | * Send an IGMP report. | |
233 | */ | |
234 | ||
235 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
236 | ||
237 | ||
238 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
239 | int gdeleted, int sdeleted) | |
240 | { | |
241 | switch (type) { | |
242 | case IGMPV3_MODE_IS_INCLUDE: | |
243 | case IGMPV3_MODE_IS_EXCLUDE: | |
244 | if (gdeleted || sdeleted) | |
245 | return 0; | |
ad12583f DS |
246 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
247 | if (pmc->sfmode == MCAST_INCLUDE) | |
248 | return 1; | |
249 | /* don't include if this source is excluded | |
250 | * in all filters | |
251 | */ | |
252 | if (psf->sf_count[MCAST_INCLUDE]) | |
253 | return type == IGMPV3_MODE_IS_INCLUDE; | |
254 | return pmc->sfcount[MCAST_EXCLUDE] == | |
255 | psf->sf_count[MCAST_EXCLUDE]; | |
256 | } | |
257 | return 0; | |
1da177e4 LT |
258 | case IGMPV3_CHANGE_TO_INCLUDE: |
259 | if (gdeleted || sdeleted) | |
260 | return 0; | |
261 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
262 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
263 | if (gdeleted || sdeleted) | |
264 | return 0; | |
265 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
266 | psf->sf_count[MCAST_INCLUDE]) | |
267 | return 0; | |
268 | return pmc->sfcount[MCAST_EXCLUDE] == | |
269 | psf->sf_count[MCAST_EXCLUDE]; | |
270 | case IGMPV3_ALLOW_NEW_SOURCES: | |
271 | if (gdeleted || !psf->sf_crcount) | |
272 | return 0; | |
273 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
274 | case IGMPV3_BLOCK_OLD_SOURCES: | |
275 | if (pmc->sfmode == MCAST_INCLUDE) | |
276 | return gdeleted || (psf->sf_crcount && sdeleted); | |
277 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
278 | } | |
279 | return 0; | |
280 | } | |
281 | ||
282 | static int | |
283 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
284 | { | |
285 | struct ip_sf_list *psf; | |
286 | int scount = 0; | |
287 | ||
288 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
289 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) | |
290 | continue; | |
291 | scount++; | |
292 | } | |
293 | return scount; | |
294 | } | |
295 | ||
57e1ab6e ED |
296 | #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb)) |
297 | ||
1da177e4 LT |
298 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) |
299 | { | |
300 | struct sk_buff *skb; | |
301 | struct rtable *rt; | |
302 | struct iphdr *pip; | |
303 | struct igmpv3_report *pig; | |
877acedc | 304 | struct net *net = dev_net(dev); |
31e4543d | 305 | struct flowi4 fl4; |
66088243 HX |
306 | int hlen = LL_RESERVED_SPACE(dev); |
307 | int tlen = dev->needed_tailroom; | |
1da177e4 | 308 | |
57e1ab6e | 309 | while (1) { |
66088243 | 310 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
311 | GFP_ATOMIC | __GFP_NOWARN); |
312 | if (skb) | |
313 | break; | |
314 | size >>= 1; | |
315 | if (size < 256) | |
316 | return NULL; | |
317 | } | |
318 | igmp_skb_size(skb) = size; | |
1da177e4 | 319 | |
31e4543d | 320 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
321 | 0, 0, |
322 | IPPROTO_IGMP, 0, dev->ifindex); | |
323 | if (IS_ERR(rt)) { | |
324 | kfree_skb(skb); | |
325 | return NULL; | |
1da177e4 | 326 | } |
1da177e4 | 327 | |
d8d1f30b | 328 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
329 | skb->dev = dev; |
330 | ||
66088243 | 331 | skb_reserve(skb, hlen); |
1da177e4 | 332 | |
7e28ecc2 | 333 | skb_reset_network_header(skb); |
eddc9ec5 | 334 | pip = ip_hdr(skb); |
7e28ecc2 | 335 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
336 | |
337 | pip->version = 4; | |
338 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
339 | pip->tos = 0xc0; | |
340 | pip->frag_off = htons(IP_DF); | |
341 | pip->ttl = 1; | |
492f64ce DM |
342 | pip->daddr = fl4.daddr; |
343 | pip->saddr = fl4.saddr; | |
1da177e4 LT |
344 | pip->protocol = IPPROTO_IGMP; |
345 | pip->tot_len = 0; /* filled in later */ | |
d8d1f30b | 346 | ip_select_ident(pip, &rt->dst, NULL); |
5e73ea1a DB |
347 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
348 | ((u8 *)&pip[1])[1] = 4; | |
349 | ((u8 *)&pip[1])[2] = 0; | |
350 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 351 | |
b0e380b1 | 352 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 353 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 354 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
355 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
356 | pig->resv1 = 0; | |
357 | pig->csum = 0; | |
358 | pig->resv2 = 0; | |
359 | pig->ngrec = 0; | |
360 | return skb; | |
361 | } | |
362 | ||
363 | static int igmpv3_sendpack(struct sk_buff *skb) | |
364 | { | |
d9edf9e2 | 365 | struct igmphdr *pig = igmp_hdr(skb); |
27a884dc | 366 | const int igmplen = skb->tail - skb->transport_header; |
1da177e4 | 367 | |
d9edf9e2 | 368 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 369 | |
c439cb2e | 370 | return ip_local_out(skb); |
1da177e4 LT |
371 | } |
372 | ||
373 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
374 | { | |
a7e9ff73 | 375 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
376 | } |
377 | ||
378 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
379 | int type, struct igmpv3_grec **ppgr) | |
380 | { | |
381 | struct net_device *dev = pmc->interface->dev; | |
382 | struct igmpv3_report *pih; | |
383 | struct igmpv3_grec *pgr; | |
384 | ||
385 | if (!skb) | |
386 | skb = igmpv3_newpack(dev, dev->mtu); | |
387 | if (!skb) | |
388 | return NULL; | |
389 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
390 | pgr->grec_type = type; | |
391 | pgr->grec_auxwords = 0; | |
392 | pgr->grec_nsrcs = 0; | |
393 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 394 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
395 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
396 | *ppgr = pgr; | |
397 | return skb; | |
398 | } | |
399 | ||
57e1ab6e | 400 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \ |
1da177e4 LT |
401 | skb_tailroom(skb)) : 0) |
402 | ||
403 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
404 | int type, int gdeleted, int sdeleted) | |
405 | { | |
406 | struct net_device *dev = pmc->interface->dev; | |
407 | struct igmpv3_report *pih; | |
408 | struct igmpv3_grec *pgr = NULL; | |
409 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 410 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
411 | |
412 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
413 | return skb; | |
414 | ||
415 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
416 | type == IGMPV3_MODE_IS_EXCLUDE; | |
417 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
418 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
419 | ||
ad12583f DS |
420 | stotal = scount = 0; |
421 | ||
1da177e4 LT |
422 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
423 | ||
ad12583f DS |
424 | if (!*psf_list) |
425 | goto empty_source; | |
426 | ||
d9edf9e2 | 427 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
428 | |
429 | /* EX and TO_EX get a fresh packet, if needed */ | |
430 | if (truncate) { | |
431 | if (pih && pih->ngrec && | |
432 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
433 | if (skb) | |
434 | igmpv3_sendpack(skb); | |
435 | skb = igmpv3_newpack(dev, dev->mtu); | |
436 | } | |
437 | } | |
438 | first = 1; | |
1da177e4 LT |
439 | psf_prev = NULL; |
440 | for (psf=*psf_list; psf; psf=psf_next) { | |
ea4d9e72 | 441 | __be32 *psrc; |
1da177e4 LT |
442 | |
443 | psf_next = psf->sf_next; | |
444 | ||
445 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
446 | psf_prev = psf; | |
447 | continue; | |
448 | } | |
449 | ||
450 | /* clear marks on query responses */ | |
451 | if (isquery) | |
452 | psf->sf_gsresp = 0; | |
453 | ||
63007727 | 454 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
455 | first*sizeof(struct igmpv3_grec)) { |
456 | if (truncate && !first) | |
457 | break; /* truncate these */ | |
458 | if (pgr) | |
459 | pgr->grec_nsrcs = htons(scount); | |
460 | if (skb) | |
461 | igmpv3_sendpack(skb); | |
462 | skb = igmpv3_newpack(dev, dev->mtu); | |
463 | first = 1; | |
464 | scount = 0; | |
465 | } | |
466 | if (first) { | |
467 | skb = add_grhead(skb, pmc, type, &pgr); | |
468 | first = 0; | |
469 | } | |
cc63f70b AD |
470 | if (!skb) |
471 | return NULL; | |
63007727 | 472 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 473 | *psrc = psf->sf_inaddr; |
ad12583f | 474 | scount++; stotal++; |
1da177e4 LT |
475 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
476 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
477 | psf->sf_crcount--; | |
478 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
479 | if (psf_prev) | |
480 | psf_prev->sf_next = psf->sf_next; | |
481 | else | |
482 | *psf_list = psf->sf_next; | |
483 | kfree(psf); | |
484 | continue; | |
485 | } | |
486 | } | |
487 | psf_prev = psf; | |
488 | } | |
ad12583f DS |
489 | |
490 | empty_source: | |
491 | if (!stotal) { | |
492 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
493 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
494 | return skb; | |
495 | if (pmc->crcount || isquery) { | |
496 | /* make sure we have room for group header */ | |
497 | if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { | |
498 | igmpv3_sendpack(skb); | |
499 | skb = NULL; /* add_grhead will get a new one */ | |
500 | } | |
501 | skb = add_grhead(skb, pmc, type, &pgr); | |
502 | } | |
503 | } | |
1da177e4 LT |
504 | if (pgr) |
505 | pgr->grec_nsrcs = htons(scount); | |
506 | ||
507 | if (isquery) | |
508 | pmc->gsquery = 0; /* clear query state on report */ | |
509 | return skb; | |
510 | } | |
511 | ||
512 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
513 | { | |
514 | struct sk_buff *skb = NULL; | |
515 | int type; | |
516 | ||
517 | if (!pmc) { | |
1d7138de ED |
518 | rcu_read_lock(); |
519 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
520 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
521 | continue; | |
522 | spin_lock_bh(&pmc->lock); | |
523 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
524 | type = IGMPV3_MODE_IS_EXCLUDE; | |
525 | else | |
526 | type = IGMPV3_MODE_IS_INCLUDE; | |
527 | skb = add_grec(skb, pmc, type, 0, 0); | |
528 | spin_unlock_bh(&pmc->lock); | |
529 | } | |
1d7138de | 530 | rcu_read_unlock(); |
1da177e4 LT |
531 | } else { |
532 | spin_lock_bh(&pmc->lock); | |
533 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
534 | type = IGMPV3_MODE_IS_EXCLUDE; | |
535 | else | |
536 | type = IGMPV3_MODE_IS_INCLUDE; | |
537 | skb = add_grec(skb, pmc, type, 0, 0); | |
538 | spin_unlock_bh(&pmc->lock); | |
539 | } | |
540 | if (!skb) | |
541 | return 0; | |
542 | return igmpv3_sendpack(skb); | |
543 | } | |
544 | ||
545 | /* | |
546 | * remove zero-count source records from a source filter list | |
547 | */ | |
548 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
549 | { | |
550 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
551 | ||
552 | psf_prev = NULL; | |
553 | for (psf=*ppsf; psf; psf = psf_next) { | |
554 | psf_next = psf->sf_next; | |
555 | if (psf->sf_crcount == 0) { | |
556 | if (psf_prev) | |
557 | psf_prev->sf_next = psf->sf_next; | |
558 | else | |
559 | *ppsf = psf->sf_next; | |
560 | kfree(psf); | |
561 | } else | |
562 | psf_prev = psf; | |
563 | } | |
564 | } | |
565 | ||
566 | static void igmpv3_send_cr(struct in_device *in_dev) | |
567 | { | |
568 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
569 | struct sk_buff *skb = NULL; | |
570 | int type, dtype; | |
571 | ||
1d7138de | 572 | rcu_read_lock(); |
1da177e4 LT |
573 | spin_lock_bh(&in_dev->mc_tomb_lock); |
574 | ||
575 | /* deleted MCA's */ | |
576 | pmc_prev = NULL; | |
577 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { | |
578 | pmc_next = pmc->next; | |
579 | if (pmc->sfmode == MCAST_INCLUDE) { | |
580 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
581 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
582 | skb = add_grec(skb, pmc, type, 1, 0); | |
583 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
584 | } | |
585 | if (pmc->crcount) { | |
1da177e4 LT |
586 | if (pmc->sfmode == MCAST_EXCLUDE) { |
587 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
588 | skb = add_grec(skb, pmc, type, 1, 0); | |
589 | } | |
ad12583f | 590 | pmc->crcount--; |
1da177e4 LT |
591 | if (pmc->crcount == 0) { |
592 | igmpv3_clear_zeros(&pmc->tomb); | |
593 | igmpv3_clear_zeros(&pmc->sources); | |
594 | } | |
595 | } | |
596 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
597 | if (pmc_prev) | |
598 | pmc_prev->next = pmc_next; | |
599 | else | |
600 | in_dev->mc_tomb = pmc_next; | |
601 | in_dev_put(pmc->interface); | |
602 | kfree(pmc); | |
603 | } else | |
604 | pmc_prev = pmc; | |
605 | } | |
606 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
607 | ||
608 | /* change recs */ | |
1d7138de | 609 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
610 | spin_lock_bh(&pmc->lock); |
611 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
612 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
613 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
614 | } else { | |
615 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
616 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
617 | } | |
618 | skb = add_grec(skb, pmc, type, 0, 0); | |
619 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
620 | ||
621 | /* filter mode changes */ | |
622 | if (pmc->crcount) { | |
1da177e4 LT |
623 | if (pmc->sfmode == MCAST_EXCLUDE) |
624 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
625 | else | |
626 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
627 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 628 | pmc->crcount--; |
1da177e4 LT |
629 | } |
630 | spin_unlock_bh(&pmc->lock); | |
631 | } | |
1d7138de | 632 | rcu_read_unlock(); |
1da177e4 LT |
633 | |
634 | if (!skb) | |
635 | return; | |
636 | (void) igmpv3_sendpack(skb); | |
637 | } | |
638 | ||
639 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
640 | int type) | |
641 | { | |
642 | struct sk_buff *skb; | |
643 | struct iphdr *iph; | |
644 | struct igmphdr *ih; | |
645 | struct rtable *rt; | |
646 | struct net_device *dev = in_dev->dev; | |
877acedc | 647 | struct net *net = dev_net(dev); |
63007727 | 648 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 649 | struct flowi4 fl4; |
63007727 | 650 | __be32 dst; |
66088243 | 651 | int hlen, tlen; |
1da177e4 LT |
652 | |
653 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
654 | return igmpv3_send_report(in_dev, pmc); | |
655 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
656 | dst = IGMP_ALL_ROUTER; | |
657 | else | |
658 | dst = group; | |
659 | ||
31e4543d | 660 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
661 | 0, 0, |
662 | IPPROTO_IGMP, 0, dev->ifindex); | |
663 | if (IS_ERR(rt)) | |
664 | return -1; | |
665 | ||
66088243 HX |
666 | hlen = LL_RESERVED_SPACE(dev); |
667 | tlen = dev->needed_tailroom; | |
668 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
1da177e4 LT |
669 | if (skb == NULL) { |
670 | ip_rt_put(rt); | |
671 | return -1; | |
672 | } | |
673 | ||
d8d1f30b | 674 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 675 | |
66088243 | 676 | skb_reserve(skb, hlen); |
1da177e4 | 677 | |
7e28ecc2 | 678 | skb_reset_network_header(skb); |
eddc9ec5 | 679 | iph = ip_hdr(skb); |
7e28ecc2 | 680 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
681 | |
682 | iph->version = 4; | |
683 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
684 | iph->tos = 0xc0; | |
685 | iph->frag_off = htons(IP_DF); | |
686 | iph->ttl = 1; | |
687 | iph->daddr = dst; | |
492f64ce | 688 | iph->saddr = fl4.saddr; |
1da177e4 | 689 | iph->protocol = IPPROTO_IGMP; |
d8d1f30b | 690 | ip_select_ident(iph, &rt->dst, NULL); |
5e73ea1a DB |
691 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
692 | ((u8 *)&iph[1])[1] = 4; | |
693 | ((u8 *)&iph[1])[2] = 0; | |
694 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 LT |
695 | |
696 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
697 | ih->type = type; |
698 | ih->code = 0; | |
699 | ih->csum = 0; | |
700 | ih->group = group; | |
701 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 702 | |
c439cb2e | 703 | return ip_local_out(skb); |
1da177e4 LT |
704 | } |
705 | ||
706 | static void igmp_gq_timer_expire(unsigned long data) | |
707 | { | |
708 | struct in_device *in_dev = (struct in_device *)data; | |
709 | ||
710 | in_dev->mr_gq_running = 0; | |
711 | igmpv3_send_report(in_dev, NULL); | |
712 | __in_dev_put(in_dev); | |
713 | } | |
714 | ||
715 | static void igmp_ifc_timer_expire(unsigned long data) | |
716 | { | |
717 | struct in_device *in_dev = (struct in_device *)data; | |
718 | ||
719 | igmpv3_send_cr(in_dev); | |
720 | if (in_dev->mr_ifc_count) { | |
721 | in_dev->mr_ifc_count--; | |
722 | igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); | |
723 | } | |
724 | __in_dev_put(in_dev); | |
725 | } | |
726 | ||
727 | static void igmp_ifc_event(struct in_device *in_dev) | |
728 | { | |
729 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
730 | return; | |
e905a9ed | 731 | in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
732 | IGMP_Unsolicited_Report_Count; |
733 | igmp_ifc_start_timer(in_dev, 1); | |
734 | } | |
735 | ||
736 | ||
737 | static void igmp_timer_expire(unsigned long data) | |
738 | { | |
739 | struct ip_mc_list *im=(struct ip_mc_list *)data; | |
740 | struct in_device *in_dev = im->interface; | |
741 | ||
742 | spin_lock(&im->lock); | |
a7e9ff73 | 743 | im->tm_running = 0; |
1da177e4 LT |
744 | |
745 | if (im->unsolicit_count) { | |
746 | im->unsolicit_count--; | |
747 | igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); | |
748 | } | |
749 | im->reporter = 1; | |
750 | spin_unlock(&im->lock); | |
751 | ||
752 | if (IGMP_V1_SEEN(in_dev)) | |
753 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
754 | else if (IGMP_V2_SEEN(in_dev)) | |
755 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
756 | else | |
757 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
758 | ||
759 | ip_ma_put(im); | |
760 | } | |
761 | ||
ad12583f | 762 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 763 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
764 | { |
765 | struct ip_sf_list *psf; | |
766 | int i, scount; | |
767 | ||
ad12583f DS |
768 | scount = 0; |
769 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
770 | if (scount == nsrcs) | |
771 | break; | |
772 | for (i=0; i<nsrcs; i++) { | |
773 | /* skip inactive filters */ | |
e05c4ad3 | 774 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
775 | pmc->sfcount[MCAST_EXCLUDE] != |
776 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 777 | break; |
ad12583f DS |
778 | if (srcs[i] == psf->sf_inaddr) { |
779 | scount++; | |
780 | break; | |
781 | } | |
782 | } | |
783 | } | |
784 | pmc->gsquery = 0; | |
785 | if (scount == nsrcs) /* all sources excluded */ | |
786 | return 0; | |
787 | return 1; | |
788 | } | |
789 | ||
ea4d9e72 | 790 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
791 | { |
792 | struct ip_sf_list *psf; | |
793 | int i, scount; | |
794 | ||
795 | if (pmc->sfmode == MCAST_EXCLUDE) | |
796 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
797 | ||
798 | /* mark INCLUDE-mode sources */ | |
1da177e4 LT |
799 | scount = 0; |
800 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
801 | if (scount == nsrcs) | |
802 | break; | |
803 | for (i=0; i<nsrcs; i++) | |
804 | if (srcs[i] == psf->sf_inaddr) { | |
805 | psf->sf_gsresp = 1; | |
806 | scount++; | |
807 | break; | |
808 | } | |
809 | } | |
ad12583f DS |
810 | if (!scount) { |
811 | pmc->gsquery = 0; | |
812 | return 0; | |
813 | } | |
814 | pmc->gsquery = 1; | |
815 | return 1; | |
1da177e4 LT |
816 | } |
817 | ||
d679c532 ED |
818 | /* return true if packet was dropped */ |
819 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
820 | { |
821 | struct ip_mc_list *im; | |
822 | ||
823 | /* Timers are only set for non-local groups */ | |
824 | ||
825 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 826 | return false; |
1da177e4 | 827 | |
1d7138de ED |
828 | rcu_read_lock(); |
829 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
830 | if (im->multiaddr == group) { |
831 | igmp_stop_timer(im); | |
832 | break; | |
833 | } | |
834 | } | |
1d7138de | 835 | rcu_read_unlock(); |
d679c532 | 836 | return false; |
1da177e4 LT |
837 | } |
838 | ||
d679c532 ED |
839 | /* return true if packet was dropped */ |
840 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
841 | int len) |
842 | { | |
d9edf9e2 ACM |
843 | struct igmphdr *ih = igmp_hdr(skb); |
844 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 845 | struct ip_mc_list *im; |
63007727 | 846 | __be32 group = ih->group; |
1da177e4 LT |
847 | int max_delay; |
848 | int mark = 0; | |
849 | ||
850 | ||
5b7c8406 | 851 | if (len == 8) { |
1da177e4 LT |
852 | if (ih->code == 0) { |
853 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 854 | |
1da177e4 LT |
855 | max_delay = IGMP_Query_Response_Interval; |
856 | in_dev->mr_v1_seen = jiffies + | |
857 | IGMP_V1_Router_Present_Timeout; | |
858 | group = 0; | |
859 | } else { | |
860 | /* v2 router present */ | |
861 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
862 | in_dev->mr_v2_seen = jiffies + | |
863 | IGMP_V2_Router_Present_Timeout; | |
864 | } | |
865 | /* cancel the interface change timer */ | |
866 | in_dev->mr_ifc_count = 0; | |
867 | if (del_timer(&in_dev->mr_ifc_timer)) | |
868 | __in_dev_put(in_dev); | |
869 | /* clear deleted report items */ | |
870 | igmpv3_clear_delrec(in_dev); | |
871 | } else if (len < 12) { | |
d679c532 | 872 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
873 | } else if (IGMP_V1_SEEN(in_dev)) { |
874 | /* This is a v3 query with v1 queriers present */ | |
875 | max_delay = IGMP_Query_Response_Interval; | |
876 | group = 0; | |
877 | } else if (IGMP_V2_SEEN(in_dev)) { | |
878 | /* this is a v3 query with v2 queriers present; | |
879 | * Interpretation of the max_delay code is problematic here. | |
880 | * A real v2 host would use ih_code directly, while v3 has a | |
881 | * different encoding. We use the v3 encoding as more likely | |
882 | * to be intended in a v3 query. | |
883 | */ | |
884 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
885 | if (!max_delay) |
886 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
887 | } else { /* v3 */ |
888 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 889 | return true; |
e905a9ed | 890 | |
d9edf9e2 | 891 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 892 | if (ih3->nsrcs) { |
e905a9ed | 893 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 894 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 895 | return true; |
d9edf9e2 | 896 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
897 | } |
898 | ||
899 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
900 | if (!max_delay) | |
901 | max_delay = 1; /* can't mod w/ 0 */ | |
902 | in_dev->mr_maxdelay = max_delay; | |
903 | if (ih3->qrv) | |
904 | in_dev->mr_qrv = ih3->qrv; | |
905 | if (!group) { /* general query */ | |
906 | if (ih3->nsrcs) | |
d679c532 | 907 | return false; /* no sources allowed */ |
1da177e4 | 908 | igmp_gq_start_timer(in_dev); |
d679c532 | 909 | return false; |
1da177e4 LT |
910 | } |
911 | /* mark sources to include, if group & source-specific */ | |
912 | mark = ih3->nsrcs != 0; | |
913 | } | |
914 | ||
915 | /* | |
916 | * - Start the timers in all of our membership records | |
917 | * that the query applies to for the interface on | |
918 | * which the query arrived excl. those that belong | |
919 | * to a "local" group (224.0.0.X) | |
920 | * - For timers already running check if they need to | |
921 | * be reset. | |
922 | * - Use the igmp->igmp_code field as the maximum | |
923 | * delay possible | |
924 | */ | |
1d7138de ED |
925 | rcu_read_lock(); |
926 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
927 | int changed; |
928 | ||
1da177e4 LT |
929 | if (group && group != im->multiaddr) |
930 | continue; | |
931 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
932 | continue; | |
933 | spin_lock_bh(&im->lock); | |
934 | if (im->tm_running) | |
935 | im->gsquery = im->gsquery && mark; | |
936 | else | |
937 | im->gsquery = mark; | |
ad12583f | 938 | changed = !im->gsquery || |
e905a9ed | 939 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 940 | spin_unlock_bh(&im->lock); |
ad12583f DS |
941 | if (changed) |
942 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 943 | } |
1d7138de | 944 | rcu_read_unlock(); |
d679c532 | 945 | return false; |
1da177e4 LT |
946 | } |
947 | ||
9a57a9d2 | 948 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
949 | int igmp_rcv(struct sk_buff *skb) |
950 | { | |
951 | /* This basically follows the spec line by line -- see RFC1112 */ | |
952 | struct igmphdr *ih; | |
9a57a9d2 | 953 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 | 954 | int len = skb->len; |
d679c532 | 955 | bool dropped = true; |
1da177e4 | 956 | |
cd557bc1 DL |
957 | if (in_dev == NULL) |
958 | goto drop; | |
1da177e4 | 959 | |
fb286bb2 | 960 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 961 | goto drop; |
fb286bb2 HX |
962 | |
963 | switch (skb->ip_summed) { | |
84fa7933 | 964 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 965 | if (!csum_fold(skb->csum)) |
fb286bb2 HX |
966 | break; |
967 | /* fall through */ | |
968 | case CHECKSUM_NONE: | |
969 | skb->csum = 0; | |
970 | if (__skb_checksum_complete(skb)) | |
9a57a9d2 | 971 | goto drop; |
1da177e4 LT |
972 | } |
973 | ||
d9edf9e2 | 974 | ih = igmp_hdr(skb); |
1da177e4 LT |
975 | switch (ih->type) { |
976 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 977 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
978 | break; |
979 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
980 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 981 | /* Is it our report looped back? */ |
c7537967 | 982 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 983 | break; |
24c69275 DS |
984 | /* don't rely on MC router hearing unicast reports */ |
985 | if (skb->pkt_type == PACKET_MULTICAST || | |
986 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 987 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
988 | break; |
989 | case IGMP_PIM: | |
990 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
991 | return pim_rcv_v1(skb); |
992 | #endif | |
c6b471e6 | 993 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
994 | case IGMP_DVMRP: |
995 | case IGMP_TRACE: | |
996 | case IGMP_HOST_LEAVE_MESSAGE: | |
997 | case IGMP_MTRACE: | |
998 | case IGMP_MTRACE_RESP: | |
999 | break; | |
1000 | default: | |
dd1c1853 | 1001 | break; |
1da177e4 | 1002 | } |
fb286bb2 | 1003 | |
cd557bc1 | 1004 | drop: |
d679c532 ED |
1005 | if (dropped) |
1006 | kfree_skb(skb); | |
1007 | else | |
1008 | consume_skb(skb); | |
1da177e4 LT |
1009 | return 0; |
1010 | } | |
1011 | ||
1012 | #endif | |
1013 | ||
1014 | ||
1015 | /* | |
1016 | * Add a filter to a device | |
1017 | */ | |
1018 | ||
63007727 | 1019 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1020 | { |
1021 | char buf[MAX_ADDR_LEN]; | |
1022 | struct net_device *dev = in_dev->dev; | |
1023 | ||
1024 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1025 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1026 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1027 | routine. Something sort of: |
1028 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1029 | --ANK | |
1030 | */ | |
1031 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1032 | dev_mc_add(dev, buf); |
1da177e4 LT |
1033 | } |
1034 | ||
1035 | /* | |
1036 | * Remove a filter from a device | |
1037 | */ | |
1038 | ||
63007727 | 1039 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1040 | { |
1041 | char buf[MAX_ADDR_LEN]; | |
1042 | struct net_device *dev = in_dev->dev; | |
1043 | ||
1044 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1045 | dev_mc_del(dev, buf); |
1da177e4 LT |
1046 | } |
1047 | ||
1048 | #ifdef CONFIG_IP_MULTICAST | |
1049 | /* | |
1050 | * deleted ip_mc_list manipulation | |
1051 | */ | |
1052 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1053 | { | |
1054 | struct ip_mc_list *pmc; | |
1055 | ||
1056 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1057 | * are actually used. In particular, the refcnt and users are not | |
1058 | * used for management of the delete list. Using the same structure | |
1059 | * for deleted items allows change reports to use common code with | |
1060 | * non-deleted or query-response MCA's. | |
1061 | */ | |
0da974f4 | 1062 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1063 | if (!pmc) |
1064 | return; | |
1da177e4 LT |
1065 | spin_lock_bh(&im->lock); |
1066 | pmc->interface = im->interface; | |
1067 | in_dev_hold(in_dev); | |
1068 | pmc->multiaddr = im->multiaddr; | |
1069 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1070 | IGMP_Unsolicited_Report_Count; | |
1071 | pmc->sfmode = im->sfmode; | |
1072 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1073 | struct ip_sf_list *psf; | |
1074 | ||
1075 | pmc->tomb = im->tomb; | |
1076 | pmc->sources = im->sources; | |
1077 | im->tomb = im->sources = NULL; | |
1078 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1079 | psf->sf_crcount = pmc->crcount; | |
1080 | } | |
1081 | spin_unlock_bh(&im->lock); | |
1082 | ||
1083 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1084 | pmc->next = in_dev->mc_tomb; | |
1085 | in_dev->mc_tomb = pmc; | |
1086 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1087 | } | |
1088 | ||
63007727 | 1089 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1090 | { |
1091 | struct ip_mc_list *pmc, *pmc_prev; | |
1092 | struct ip_sf_list *psf, *psf_next; | |
1093 | ||
1094 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1095 | pmc_prev = NULL; | |
1096 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { | |
1097 | if (pmc->multiaddr == multiaddr) | |
1098 | break; | |
1099 | pmc_prev = pmc; | |
1100 | } | |
1101 | if (pmc) { | |
1102 | if (pmc_prev) | |
1103 | pmc_prev->next = pmc->next; | |
1104 | else | |
1105 | in_dev->mc_tomb = pmc->next; | |
1106 | } | |
1107 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1108 | if (pmc) { | |
1109 | for (psf=pmc->tomb; psf; psf=psf_next) { | |
1110 | psf_next = psf->sf_next; | |
1111 | kfree(psf); | |
1112 | } | |
1113 | in_dev_put(pmc->interface); | |
1114 | kfree(pmc); | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1119 | { | |
1120 | struct ip_mc_list *pmc, *nextpmc; | |
1121 | ||
1122 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1123 | pmc = in_dev->mc_tomb; | |
1124 | in_dev->mc_tomb = NULL; | |
1125 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1126 | ||
1127 | for (; pmc; pmc = nextpmc) { | |
1128 | nextpmc = pmc->next; | |
1129 | ip_mc_clear_src(pmc); | |
1130 | in_dev_put(pmc->interface); | |
1131 | kfree(pmc); | |
1132 | } | |
1133 | /* clear dead sources, too */ | |
1d7138de ED |
1134 | rcu_read_lock(); |
1135 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1136 | struct ip_sf_list *psf, *psf_next; |
1137 | ||
1138 | spin_lock_bh(&pmc->lock); | |
1139 | psf = pmc->tomb; | |
1140 | pmc->tomb = NULL; | |
1141 | spin_unlock_bh(&pmc->lock); | |
1142 | for (; psf; psf=psf_next) { | |
1143 | psf_next = psf->sf_next; | |
1144 | kfree(psf); | |
1145 | } | |
1146 | } | |
1d7138de | 1147 | rcu_read_unlock(); |
1da177e4 LT |
1148 | } |
1149 | #endif | |
1150 | ||
1151 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1152 | { | |
1153 | struct in_device *in_dev = im->interface; | |
1154 | #ifdef CONFIG_IP_MULTICAST | |
1155 | int reporter; | |
1156 | #endif | |
1157 | ||
1158 | if (im->loaded) { | |
1159 | im->loaded = 0; | |
1160 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1161 | } | |
1162 | ||
1163 | #ifdef CONFIG_IP_MULTICAST | |
1164 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1165 | return; | |
1166 | ||
1167 | reporter = im->reporter; | |
1168 | igmp_stop_timer(im); | |
1169 | ||
1170 | if (!in_dev->dead) { | |
1171 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1172 | return; |
1da177e4 LT |
1173 | if (IGMP_V2_SEEN(in_dev)) { |
1174 | if (reporter) | |
1175 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1176 | return; |
1da177e4 LT |
1177 | } |
1178 | /* IGMPv3 */ | |
1179 | igmpv3_add_delrec(in_dev, im); | |
1180 | ||
1181 | igmp_ifc_event(in_dev); | |
1182 | } | |
1da177e4 | 1183 | #endif |
1da177e4 LT |
1184 | } |
1185 | ||
1186 | static void igmp_group_added(struct ip_mc_list *im) | |
1187 | { | |
1188 | struct in_device *in_dev = im->interface; | |
1189 | ||
1190 | if (im->loaded == 0) { | |
1191 | im->loaded = 1; | |
1192 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1193 | } | |
1194 | ||
1195 | #ifdef CONFIG_IP_MULTICAST | |
1196 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1197 | return; | |
1198 | ||
1199 | if (in_dev->dead) | |
1200 | return; | |
1201 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1202 | spin_lock_bh(&im->lock); | |
1203 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1204 | spin_unlock_bh(&im->lock); | |
1205 | return; | |
1206 | } | |
1207 | /* else, v3 */ | |
1208 | ||
1209 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1210 | IGMP_Unsolicited_Report_Count; | |
1211 | igmp_ifc_event(in_dev); | |
1212 | #endif | |
1213 | } | |
1214 | ||
1215 | ||
1216 | /* | |
1217 | * Multicast list managers | |
1218 | */ | |
1219 | ||
1220 | ||
1221 | /* | |
1222 | * A socket has joined a multicast group on device dev. | |
1223 | */ | |
1224 | ||
8f935bbd | 1225 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1226 | { |
1227 | struct ip_mc_list *im; | |
1228 | ||
1229 | ASSERT_RTNL(); | |
1230 | ||
1d7138de | 1231 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1232 | if (im->multiaddr == addr) { |
1233 | im->users++; | |
1234 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1235 | goto out; | |
1236 | } | |
1237 | } | |
1238 | ||
1d7138de | 1239 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1240 | if (!im) |
1241 | goto out; | |
1242 | ||
a7e9ff73 JK |
1243 | im->users = 1; |
1244 | im->interface = in_dev; | |
1da177e4 | 1245 | in_dev_hold(in_dev); |
a7e9ff73 | 1246 | im->multiaddr = addr; |
1da177e4 LT |
1247 | /* initial mode is (EX, empty) */ |
1248 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1249 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1250 | atomic_set(&im->refcnt, 1); |
1251 | spin_lock_init(&im->lock); | |
1252 | #ifdef CONFIG_IP_MULTICAST | |
b24b8a24 | 1253 | setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); |
1da177e4 | 1254 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; |
1da177e4 | 1255 | #endif |
1d7138de ED |
1256 | |
1257 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1258 | in_dev->mc_count++; |
cf778b00 | 1259 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1260 | |
1da177e4 LT |
1261 | #ifdef CONFIG_IP_MULTICAST |
1262 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1263 | #endif | |
1264 | igmp_group_added(im); | |
1265 | if (!in_dev->dead) | |
1266 | ip_rt_multicast_event(in_dev); | |
1267 | out: | |
1268 | return; | |
1269 | } | |
4bc2f18b | 1270 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1271 | |
a816c7c7 JV |
1272 | /* |
1273 | * Resend IGMP JOIN report; used for bonding. | |
866f3b25 | 1274 | * Called with rcu_read_lock() |
a816c7c7 | 1275 | */ |
866f3b25 | 1276 | void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1277 | { |
08882669 | 1278 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1279 | struct ip_mc_list *im; |
1280 | int type; | |
a816c7c7 | 1281 | |
866f3b25 ED |
1282 | for_each_pmc_rcu(in_dev, im) { |
1283 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1284 | continue; | |
a816c7c7 | 1285 | |
866f3b25 ED |
1286 | /* a failover is happening and switches |
1287 | * must be notified immediately | |
1288 | */ | |
1289 | if (IGMP_V1_SEEN(in_dev)) | |
1290 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1291 | else if (IGMP_V2_SEEN(in_dev)) | |
1292 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1293 | else | |
1294 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1295 | igmp_send_report(in_dev, im, type); | |
1296 | } | |
a816c7c7 JV |
1297 | #endif |
1298 | } | |
866f3b25 | 1299 | EXPORT_SYMBOL(ip_mc_rejoin_groups); |
a816c7c7 | 1300 | |
1da177e4 LT |
1301 | /* |
1302 | * A socket has left a multicast group on device dev | |
1303 | */ | |
1304 | ||
8f935bbd | 1305 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1306 | { |
1d7138de ED |
1307 | struct ip_mc_list *i; |
1308 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1309 | |
1da177e4 | 1310 | ASSERT_RTNL(); |
e905a9ed | 1311 | |
1d7138de ED |
1312 | for (ip = &in_dev->mc_list; |
1313 | (i = rtnl_dereference(*ip)) != NULL; | |
1314 | ip = &i->next_rcu) { | |
a7e9ff73 | 1315 | if (i->multiaddr == addr) { |
1da177e4 | 1316 | if (--i->users == 0) { |
1d7138de | 1317 | *ip = i->next_rcu; |
b8bae41e | 1318 | in_dev->mc_count--; |
1da177e4 | 1319 | igmp_group_dropped(i); |
24cf3af3 | 1320 | ip_mc_clear_src(i); |
1da177e4 LT |
1321 | |
1322 | if (!in_dev->dead) | |
1323 | ip_rt_multicast_event(in_dev); | |
1324 | ||
1325 | ip_ma_put(i); | |
1326 | return; | |
1327 | } | |
1328 | break; | |
1329 | } | |
1330 | } | |
1331 | } | |
4bc2f18b | 1332 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1333 | |
75c78500 MS |
1334 | /* Device changing type */ |
1335 | ||
1336 | void ip_mc_unmap(struct in_device *in_dev) | |
1337 | { | |
1d7138de | 1338 | struct ip_mc_list *pmc; |
75c78500 MS |
1339 | |
1340 | ASSERT_RTNL(); | |
1341 | ||
1d7138de ED |
1342 | for_each_pmc_rtnl(in_dev, pmc) |
1343 | igmp_group_dropped(pmc); | |
75c78500 MS |
1344 | } |
1345 | ||
1346 | void ip_mc_remap(struct in_device *in_dev) | |
1347 | { | |
1d7138de | 1348 | struct ip_mc_list *pmc; |
75c78500 MS |
1349 | |
1350 | ASSERT_RTNL(); | |
1351 | ||
1d7138de ED |
1352 | for_each_pmc_rtnl(in_dev, pmc) |
1353 | igmp_group_added(pmc); | |
75c78500 MS |
1354 | } |
1355 | ||
1da177e4 LT |
1356 | /* Device going down */ |
1357 | ||
1358 | void ip_mc_down(struct in_device *in_dev) | |
1359 | { | |
1d7138de | 1360 | struct ip_mc_list *pmc; |
1da177e4 LT |
1361 | |
1362 | ASSERT_RTNL(); | |
1363 | ||
1d7138de ED |
1364 | for_each_pmc_rtnl(in_dev, pmc) |
1365 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1366 | |
1367 | #ifdef CONFIG_IP_MULTICAST | |
1368 | in_dev->mr_ifc_count = 0; | |
1369 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1370 | __in_dev_put(in_dev); | |
1371 | in_dev->mr_gq_running = 0; | |
1372 | if (del_timer(&in_dev->mr_gq_timer)) | |
1373 | __in_dev_put(in_dev); | |
1374 | igmpv3_clear_delrec(in_dev); | |
1375 | #endif | |
1376 | ||
1377 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1378 | } | |
1379 | ||
1380 | void ip_mc_init_dev(struct in_device *in_dev) | |
1381 | { | |
1382 | ASSERT_RTNL(); | |
1383 | ||
1384 | in_dev->mc_tomb = NULL; | |
1385 | #ifdef CONFIG_IP_MULTICAST | |
1386 | in_dev->mr_gq_running = 0; | |
b24b8a24 PE |
1387 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1388 | (unsigned long)in_dev); | |
1da177e4 | 1389 | in_dev->mr_ifc_count = 0; |
b8bae41e | 1390 | in_dev->mc_count = 0; |
b24b8a24 PE |
1391 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1392 | (unsigned long)in_dev); | |
1da177e4 LT |
1393 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; |
1394 | #endif | |
1395 | ||
1da177e4 LT |
1396 | spin_lock_init(&in_dev->mc_tomb_lock); |
1397 | } | |
1398 | ||
1399 | /* Device going up */ | |
1400 | ||
1401 | void ip_mc_up(struct in_device *in_dev) | |
1402 | { | |
1d7138de | 1403 | struct ip_mc_list *pmc; |
1da177e4 LT |
1404 | |
1405 | ASSERT_RTNL(); | |
1406 | ||
1407 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1408 | ||
1d7138de ED |
1409 | for_each_pmc_rtnl(in_dev, pmc) |
1410 | igmp_group_added(pmc); | |
1da177e4 LT |
1411 | } |
1412 | ||
1413 | /* | |
1414 | * Device is about to be destroyed: clean up. | |
1415 | */ | |
1416 | ||
1417 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1418 | { | |
1419 | struct ip_mc_list *i; | |
1420 | ||
1421 | ASSERT_RTNL(); | |
1422 | ||
1423 | /* Deactivate timers */ | |
1424 | ip_mc_down(in_dev); | |
1425 | ||
1d7138de ED |
1426 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1427 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1428 | in_dev->mc_count--; |
1d7138de | 1429 | |
24cf3af3 VF |
1430 | /* We've dropped the groups in ip_mc_down already */ |
1431 | ip_mc_clear_src(i); | |
1da177e4 | 1432 | ip_ma_put(i); |
1da177e4 | 1433 | } |
1da177e4 LT |
1434 | } |
1435 | ||
9e917dca | 1436 | /* RTNL is locked */ |
877acedc | 1437 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1438 | { |
1da177e4 LT |
1439 | struct net_device *dev = NULL; |
1440 | struct in_device *idev = NULL; | |
1441 | ||
1442 | if (imr->imr_ifindex) { | |
877acedc | 1443 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1444 | return idev; |
1445 | } | |
1446 | if (imr->imr_address.s_addr) { | |
9e917dca | 1447 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1448 | if (!dev) |
1449 | return NULL; | |
1da177e4 LT |
1450 | } |
1451 | ||
b23dd4fe | 1452 | if (!dev) { |
78fbfd8a DM |
1453 | struct rtable *rt = ip_route_output(net, |
1454 | imr->imr_multiaddr.s_addr, | |
1455 | 0, 0, 0); | |
b23dd4fe DM |
1456 | if (!IS_ERR(rt)) { |
1457 | dev = rt->dst.dev; | |
1458 | ip_rt_put(rt); | |
1459 | } | |
1da177e4 LT |
1460 | } |
1461 | if (dev) { | |
1462 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1463 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1464 | } |
1465 | return idev; | |
1466 | } | |
1467 | ||
1468 | /* | |
1469 | * Join a socket to a group | |
1470 | */ | |
ab32ea5d BH |
1471 | int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; |
1472 | int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; | |
1da177e4 LT |
1473 | |
1474 | ||
1475 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1476 | __be32 *psfsrc) |
1da177e4 LT |
1477 | { |
1478 | struct ip_sf_list *psf, *psf_prev; | |
1479 | int rv = 0; | |
1480 | ||
1481 | psf_prev = NULL; | |
1482 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1483 | if (psf->sf_inaddr == *psfsrc) | |
1484 | break; | |
1485 | psf_prev = psf; | |
1486 | } | |
1487 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1488 | /* source filter not found, or count wrong => bug */ | |
1489 | return -ESRCH; | |
1490 | } | |
1491 | psf->sf_count[sfmode]--; | |
1492 | if (psf->sf_count[sfmode] == 0) { | |
1493 | ip_rt_multicast_event(pmc->interface); | |
1494 | } | |
1495 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1496 | #ifdef CONFIG_IP_MULTICAST | |
1497 | struct in_device *in_dev = pmc->interface; | |
1498 | #endif | |
1499 | ||
1500 | /* no more filters for this source */ | |
1501 | if (psf_prev) | |
1502 | psf_prev->sf_next = psf->sf_next; | |
1503 | else | |
1504 | pmc->sources = psf->sf_next; | |
1505 | #ifdef CONFIG_IP_MULTICAST | |
1506 | if (psf->sf_oldin && | |
1507 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
e905a9ed | 1508 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1509 | IGMP_Unsolicited_Report_Count; |
1510 | psf->sf_next = pmc->tomb; | |
1511 | pmc->tomb = psf; | |
1512 | rv = 1; | |
1513 | } else | |
1514 | #endif | |
1515 | kfree(psf); | |
1516 | } | |
1517 | return rv; | |
1518 | } | |
1519 | ||
1520 | #ifndef CONFIG_IP_MULTICAST | |
1521 | #define igmp_ifc_event(x) do { } while (0) | |
1522 | #endif | |
1523 | ||
8f935bbd AV |
1524 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1525 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1526 | { |
1527 | struct ip_mc_list *pmc; | |
1528 | int changerec = 0; | |
1529 | int i, err; | |
1530 | ||
1531 | if (!in_dev) | |
1532 | return -ENODEV; | |
1d7138de ED |
1533 | rcu_read_lock(); |
1534 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1535 | if (*pmca == pmc->multiaddr) |
1536 | break; | |
1537 | } | |
1538 | if (!pmc) { | |
1539 | /* MCA not found?? bug */ | |
1d7138de | 1540 | rcu_read_unlock(); |
1da177e4 LT |
1541 | return -ESRCH; |
1542 | } | |
1543 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1544 | rcu_read_unlock(); |
1da177e4 LT |
1545 | #ifdef CONFIG_IP_MULTICAST |
1546 | sf_markstate(pmc); | |
1547 | #endif | |
1548 | if (!delta) { | |
1549 | err = -EINVAL; | |
1550 | if (!pmc->sfcount[sfmode]) | |
1551 | goto out_unlock; | |
1552 | pmc->sfcount[sfmode]--; | |
1553 | } | |
1554 | err = 0; | |
1555 | for (i=0; i<sfcount; i++) { | |
1556 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1557 | ||
1558 | changerec |= rv > 0; | |
1559 | if (!err && rv < 0) | |
1560 | err = rv; | |
1561 | } | |
1562 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1563 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1564 | pmc->sfcount[MCAST_INCLUDE]) { | |
1565 | #ifdef CONFIG_IP_MULTICAST | |
1566 | struct ip_sf_list *psf; | |
1567 | #endif | |
1568 | ||
1569 | /* filter mode change */ | |
1570 | pmc->sfmode = MCAST_INCLUDE; | |
1571 | #ifdef CONFIG_IP_MULTICAST | |
e905a9ed | 1572 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1573 | IGMP_Unsolicited_Report_Count; |
1574 | in_dev->mr_ifc_count = pmc->crcount; | |
1575 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1576 | psf->sf_crcount = 0; | |
1577 | igmp_ifc_event(pmc->interface); | |
1578 | } else if (sf_setstate(pmc) || changerec) { | |
1579 | igmp_ifc_event(pmc->interface); | |
1580 | #endif | |
1581 | } | |
1582 | out_unlock: | |
1583 | spin_unlock_bh(&pmc->lock); | |
1584 | return err; | |
1585 | } | |
1586 | ||
1587 | /* | |
1588 | * Add multicast single-source filter to the interface list | |
1589 | */ | |
1590 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1591 | __be32 *psfsrc) |
1da177e4 LT |
1592 | { |
1593 | struct ip_sf_list *psf, *psf_prev; | |
1594 | ||
1595 | psf_prev = NULL; | |
1596 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1597 | if (psf->sf_inaddr == *psfsrc) | |
1598 | break; | |
1599 | psf_prev = psf; | |
1600 | } | |
1601 | if (!psf) { | |
0da974f4 | 1602 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1603 | if (!psf) |
1604 | return -ENOBUFS; | |
1da177e4 LT |
1605 | psf->sf_inaddr = *psfsrc; |
1606 | if (psf_prev) { | |
1607 | psf_prev->sf_next = psf; | |
1608 | } else | |
1609 | pmc->sources = psf; | |
1610 | } | |
1611 | psf->sf_count[sfmode]++; | |
1612 | if (psf->sf_count[sfmode] == 1) { | |
1613 | ip_rt_multicast_event(pmc->interface); | |
1614 | } | |
1615 | return 0; | |
1616 | } | |
1617 | ||
1618 | #ifdef CONFIG_IP_MULTICAST | |
1619 | static void sf_markstate(struct ip_mc_list *pmc) | |
1620 | { | |
1621 | struct ip_sf_list *psf; | |
1622 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1623 | ||
1624 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1625 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1626 | psf->sf_oldin = mca_xcount == | |
1627 | psf->sf_count[MCAST_EXCLUDE] && | |
1628 | !psf->sf_count[MCAST_INCLUDE]; | |
1629 | } else | |
1630 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1631 | } | |
1632 | ||
1633 | static int sf_setstate(struct ip_mc_list *pmc) | |
1634 | { | |
ad12583f | 1635 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1636 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1637 | int qrv = pmc->interface->mr_qrv; | |
1638 | int new_in, rv; | |
1639 | ||
1640 | rv = 0; | |
1641 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1642 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1643 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1644 | !psf->sf_count[MCAST_INCLUDE]; | |
1645 | } else | |
1646 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1647 | if (new_in) { |
1648 | if (!psf->sf_oldin) { | |
76edc605 | 1649 | struct ip_sf_list *prev = NULL; |
ad12583f DS |
1650 | |
1651 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { | |
1652 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1653 | break; | |
1654 | prev = dpsf; | |
1655 | } | |
1656 | if (dpsf) { | |
1657 | if (prev) | |
1658 | prev->sf_next = dpsf->sf_next; | |
1659 | else | |
1660 | pmc->tomb = dpsf->sf_next; | |
1661 | kfree(dpsf); | |
1662 | } | |
1663 | psf->sf_crcount = qrv; | |
1664 | rv++; | |
1665 | } | |
1666 | } else if (psf->sf_oldin) { | |
1667 | ||
1668 | psf->sf_crcount = 0; | |
1669 | /* | |
1670 | * add or update "delete" records if an active filter | |
1671 | * is now inactive | |
1672 | */ | |
1673 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) | |
1674 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1675 | break; | |
1676 | if (!dpsf) { | |
3ed37a6f | 1677 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1678 | if (!dpsf) |
1679 | continue; | |
1680 | *dpsf = *psf; | |
1681 | /* pmc->lock held by callers */ | |
1682 | dpsf->sf_next = pmc->tomb; | |
1683 | pmc->tomb = dpsf; | |
1684 | } | |
1685 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1686 | rv++; |
1687 | } | |
1688 | } | |
1689 | return rv; | |
1690 | } | |
1691 | #endif | |
1692 | ||
1693 | /* | |
1694 | * Add multicast source filter list to the interface list | |
1695 | */ | |
8f935bbd AV |
1696 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1697 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1698 | { |
1699 | struct ip_mc_list *pmc; | |
1700 | int isexclude; | |
1701 | int i, err; | |
1702 | ||
1703 | if (!in_dev) | |
1704 | return -ENODEV; | |
1d7138de ED |
1705 | rcu_read_lock(); |
1706 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1707 | if (*pmca == pmc->multiaddr) |
1708 | break; | |
1709 | } | |
1710 | if (!pmc) { | |
1711 | /* MCA not found?? bug */ | |
1d7138de | 1712 | rcu_read_unlock(); |
1da177e4 LT |
1713 | return -ESRCH; |
1714 | } | |
1715 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1716 | rcu_read_unlock(); |
1da177e4 LT |
1717 | |
1718 | #ifdef CONFIG_IP_MULTICAST | |
1719 | sf_markstate(pmc); | |
1720 | #endif | |
1721 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1722 | if (!delta) | |
1723 | pmc->sfcount[sfmode]++; | |
1724 | err = 0; | |
1725 | for (i=0; i<sfcount; i++) { | |
5eb81e89 | 1726 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
1727 | if (err) |
1728 | break; | |
1729 | } | |
1730 | if (err) { | |
1731 | int j; | |
1732 | ||
685f94e6 JZ |
1733 | if (!delta) |
1734 | pmc->sfcount[sfmode]--; | |
1da177e4 | 1735 | for (j=0; j<i; j++) |
a1889c0d | 1736 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
1737 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
1738 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 1739 | struct ip_sf_list *psf; |
cfcabdcc | 1740 | in_dev = pmc->interface; |
1da177e4 LT |
1741 | #endif |
1742 | ||
1743 | /* filter mode change */ | |
1744 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1745 | pmc->sfmode = MCAST_EXCLUDE; | |
1746 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1747 | pmc->sfmode = MCAST_INCLUDE; | |
1748 | #ifdef CONFIG_IP_MULTICAST | |
1749 | /* else no filters; keep old mode for reports */ | |
1750 | ||
e905a9ed | 1751 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1752 | IGMP_Unsolicited_Report_Count; |
1753 | in_dev->mr_ifc_count = pmc->crcount; | |
1754 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1755 | psf->sf_crcount = 0; | |
1756 | igmp_ifc_event(in_dev); | |
1757 | } else if (sf_setstate(pmc)) { | |
1758 | igmp_ifc_event(in_dev); | |
1759 | #endif | |
1760 | } | |
1761 | spin_unlock_bh(&pmc->lock); | |
1762 | return err; | |
1763 | } | |
1764 | ||
1765 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1766 | { | |
1767 | struct ip_sf_list *psf, *nextpsf; | |
1768 | ||
1769 | for (psf=pmc->tomb; psf; psf=nextpsf) { | |
1770 | nextpsf = psf->sf_next; | |
1771 | kfree(psf); | |
1772 | } | |
1773 | pmc->tomb = NULL; | |
1774 | for (psf=pmc->sources; psf; psf=nextpsf) { | |
1775 | nextpsf = psf->sf_next; | |
1776 | kfree(psf); | |
1777 | } | |
1778 | pmc->sources = NULL; | |
1779 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1780 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1781 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1782 | } | |
1783 | ||
1784 | ||
1785 | /* | |
1786 | * Join a multicast group | |
1787 | */ | |
1788 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1789 | { | |
1790 | int err; | |
8f935bbd | 1791 | __be32 addr = imr->imr_multiaddr.s_addr; |
a7e9ff73 | 1792 | struct ip_mc_socklist *iml = NULL, *i; |
1da177e4 LT |
1793 | struct in_device *in_dev; |
1794 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 1795 | struct net *net = sock_net(sk); |
ca9b907d | 1796 | int ifindex; |
1da177e4 LT |
1797 | int count = 0; |
1798 | ||
f97c1e0c | 1799 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1800 | return -EINVAL; |
1801 | ||
6756ae4b | 1802 | rtnl_lock(); |
1da177e4 | 1803 | |
877acedc | 1804 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
1805 | |
1806 | if (!in_dev) { | |
1807 | iml = NULL; | |
1808 | err = -ENODEV; | |
1809 | goto done; | |
1810 | } | |
1811 | ||
1da177e4 | 1812 | err = -EADDRINUSE; |
ca9b907d | 1813 | ifindex = imr->imr_ifindex; |
1d7138de | 1814 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
1815 | if (i->multi.imr_multiaddr.s_addr == addr && |
1816 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1817 | goto done; |
1da177e4 LT |
1818 | count++; |
1819 | } | |
1820 | err = -ENOBUFS; | |
ca9b907d DS |
1821 | if (count >= sysctl_igmp_max_memberships) |
1822 | goto done; | |
a7e9ff73 | 1823 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
ca9b907d | 1824 | if (iml == NULL) |
1da177e4 | 1825 | goto done; |
ca9b907d | 1826 | |
1da177e4 | 1827 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 1828 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
1829 | iml->sflist = NULL; |
1830 | iml->sfmode = MCAST_EXCLUDE; | |
cf778b00 | 1831 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 1832 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 1833 | err = 0; |
1da177e4 | 1834 | done: |
6756ae4b | 1835 | rtnl_unlock(); |
1da177e4 LT |
1836 | return err; |
1837 | } | |
4bc2f18b | 1838 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
1839 | |
1840 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
1841 | struct in_device *in_dev) | |
1842 | { | |
1d7138de | 1843 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
1844 | int err; |
1845 | ||
c85bb41e | 1846 | if (psf == NULL) { |
1da177e4 LT |
1847 | /* any-source empty exclude case */ |
1848 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1849 | iml->sfmode, 0, NULL, 0); | |
1850 | } | |
1851 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 1852 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 1853 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
1854 | /* decrease mem now to avoid the memleak warning */ |
1855 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 1856 | kfree_rcu(psf, rcu); |
1da177e4 LT |
1857 | return err; |
1858 | } | |
1859 | ||
1860 | /* | |
1861 | * Ask a socket to leave a group. | |
1862 | */ | |
1863 | ||
1864 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1865 | { | |
1866 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
1867 | struct ip_mc_socklist *iml; |
1868 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 1869 | struct in_device *in_dev; |
877acedc | 1870 | struct net *net = sock_net(sk); |
8f935bbd | 1871 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 1872 | u32 ifindex; |
acd6e00b | 1873 | int ret = -EADDRNOTAVAIL; |
1da177e4 LT |
1874 | |
1875 | rtnl_lock(); | |
877acedc | 1876 | in_dev = ip_mc_find_dev(net, imr); |
84b42bae | 1877 | ifindex = imr->imr_ifindex; |
1d7138de ED |
1878 | for (imlp = &inet->mc_list; |
1879 | (iml = rtnl_dereference(*imlp)) != NULL; | |
1880 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
1881 | if (iml->multi.imr_multiaddr.s_addr != group) |
1882 | continue; | |
1883 | if (ifindex) { | |
1884 | if (iml->multi.imr_ifindex != ifindex) | |
1885 | continue; | |
1886 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
1887 | iml->multi.imr_address.s_addr) | |
1888 | continue; | |
1da177e4 | 1889 | |
acd6e00b | 1890 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 1891 | |
1d7138de | 1892 | *imlp = iml->next_rcu; |
acd6e00b DS |
1893 | |
1894 | if (in_dev) | |
84b42bae | 1895 | ip_mc_dec_group(in_dev, group); |
acd6e00b | 1896 | rtnl_unlock(); |
c85bb41e FL |
1897 | /* decrease mem now to avoid the memleak warning */ |
1898 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 1899 | kfree_rcu(iml, rcu); |
acd6e00b | 1900 | return 0; |
1da177e4 | 1901 | } |
acd6e00b DS |
1902 | if (!in_dev) |
1903 | ret = -ENODEV; | |
1da177e4 | 1904 | rtnl_unlock(); |
acd6e00b | 1905 | return ret; |
1da177e4 | 1906 | } |
193ba924 | 1907 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
1908 | |
1909 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1910 | ip_mreq_source *mreqs, int ifindex) | |
1911 | { | |
1912 | int err; | |
1913 | struct ip_mreqn imr; | |
63007727 | 1914 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
1915 | struct ip_mc_socklist *pmc; |
1916 | struct in_device *in_dev = NULL; | |
1917 | struct inet_sock *inet = inet_sk(sk); | |
1918 | struct ip_sf_socklist *psl; | |
877acedc | 1919 | struct net *net = sock_net(sk); |
8cdaaa15 | 1920 | int leavegroup = 0; |
1da177e4 LT |
1921 | int i, j, rv; |
1922 | ||
f97c1e0c | 1923 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1924 | return -EINVAL; |
1925 | ||
6756ae4b | 1926 | rtnl_lock(); |
1da177e4 LT |
1927 | |
1928 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1929 | imr.imr_address.s_addr = mreqs->imr_interface; | |
1930 | imr.imr_ifindex = ifindex; | |
877acedc | 1931 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
1932 | |
1933 | if (!in_dev) { | |
1934 | err = -ENODEV; | |
1935 | goto done; | |
1936 | } | |
1937 | err = -EADDRNOTAVAIL; | |
1938 | ||
1d7138de | 1939 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
1940 | if ((pmc->multi.imr_multiaddr.s_addr == |
1941 | imr.imr_multiaddr.s_addr) && | |
1942 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
1943 | break; |
1944 | } | |
917f2f10 DS |
1945 | if (!pmc) { /* must have a prior join */ |
1946 | err = -EINVAL; | |
1da177e4 | 1947 | goto done; |
917f2f10 | 1948 | } |
1da177e4 LT |
1949 | /* if a source filter was set, must be the same mode as before */ |
1950 | if (pmc->sflist) { | |
917f2f10 DS |
1951 | if (pmc->sfmode != omode) { |
1952 | err = -EINVAL; | |
1da177e4 | 1953 | goto done; |
917f2f10 | 1954 | } |
1da177e4 LT |
1955 | } else if (pmc->sfmode != omode) { |
1956 | /* allow mode switches for empty-set filters */ | |
1957 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 1958 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
1959 | NULL, 0); |
1960 | pmc->sfmode = omode; | |
1961 | } | |
1962 | ||
1d7138de | 1963 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
1964 | if (!add) { |
1965 | if (!psl) | |
917f2f10 | 1966 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 LT |
1967 | rv = !0; |
1968 | for (i=0; i<psl->sl_count; i++) { | |
1969 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 1970 | sizeof(__be32)); |
1da177e4 LT |
1971 | if (rv == 0) |
1972 | break; | |
1973 | } | |
1974 | if (rv) /* source not found */ | |
917f2f10 | 1975 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 1976 | |
8cdaaa15 DS |
1977 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1978 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
1979 | leavegroup = 1; | |
1980 | goto done; | |
1981 | } | |
1982 | ||
1da177e4 | 1983 | /* update the interface filter */ |
e905a9ed | 1984 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
1985 | &mreqs->imr_sourceaddr, 1); |
1986 | ||
1987 | for (j=i+1; j<psl->sl_count; j++) | |
1988 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
1989 | psl->sl_count--; | |
1990 | err = 0; | |
1991 | goto done; | |
1992 | } | |
1993 | /* else, add a new source to the filter */ | |
1994 | ||
1995 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
1996 | err = -ENOBUFS; | |
1997 | goto done; | |
1998 | } | |
1999 | if (!psl || psl->sl_count == psl->sl_max) { | |
2000 | struct ip_sf_socklist *newpsl; | |
2001 | int count = IP_SFBLOCK; | |
2002 | ||
2003 | if (psl) | |
2004 | count += psl->sl_max; | |
8b3a7005 | 2005 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2006 | if (!newpsl) { |
2007 | err = -ENOBUFS; | |
2008 | goto done; | |
2009 | } | |
2010 | newpsl->sl_max = count; | |
2011 | newpsl->sl_count = count - IP_SFBLOCK; | |
2012 | if (psl) { | |
2013 | for (i=0; i<psl->sl_count; i++) | |
2014 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
c85bb41e FL |
2015 | /* decrease mem now to avoid the memleak warning */ |
2016 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2017 | kfree_rcu(psl, rcu); |
1da177e4 | 2018 | } |
cf778b00 | 2019 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2020 | psl = newpsl; |
1da177e4 LT |
2021 | } |
2022 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
2023 | for (i=0; i<psl->sl_count; i++) { | |
2024 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 2025 | sizeof(__be32)); |
1da177e4 LT |
2026 | if (rv == 0) |
2027 | break; | |
2028 | } | |
2029 | if (rv == 0) /* address already there is an error */ | |
2030 | goto done; | |
2031 | for (j=psl->sl_count-1; j>=i; j--) | |
2032 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
2033 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2034 | psl->sl_count++; | |
2035 | err = 0; | |
2036 | /* update the interface list */ | |
e905a9ed | 2037 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2038 | &mreqs->imr_sourceaddr, 1); |
2039 | done: | |
6756ae4b | 2040 | rtnl_unlock(); |
8cdaaa15 DS |
2041 | if (leavegroup) |
2042 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2043 | return err; |
2044 | } | |
2045 | ||
2046 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2047 | { | |
9951f036 | 2048 | int err = 0; |
1da177e4 | 2049 | struct ip_mreqn imr; |
63007727 | 2050 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2051 | struct ip_mc_socklist *pmc; |
2052 | struct in_device *in_dev; | |
2053 | struct inet_sock *inet = inet_sk(sk); | |
2054 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2055 | struct net *net = sock_net(sk); |
9951f036 | 2056 | int leavegroup = 0; |
1da177e4 | 2057 | |
f97c1e0c | 2058 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2059 | return -EINVAL; |
2060 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2061 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2062 | return -EINVAL; | |
2063 | ||
6756ae4b | 2064 | rtnl_lock(); |
1da177e4 LT |
2065 | |
2066 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2067 | imr.imr_address.s_addr = msf->imsf_interface; | |
2068 | imr.imr_ifindex = ifindex; | |
877acedc | 2069 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2070 | |
2071 | if (!in_dev) { | |
2072 | err = -ENODEV; | |
2073 | goto done; | |
2074 | } | |
1da177e4 | 2075 | |
9951f036 DS |
2076 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2077 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2078 | leavegroup = 1; | |
2079 | goto done; | |
2080 | } | |
2081 | ||
1d7138de | 2082 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2083 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2084 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2085 | break; | |
2086 | } | |
917f2f10 DS |
2087 | if (!pmc) { /* must have a prior join */ |
2088 | err = -EINVAL; | |
1da177e4 | 2089 | goto done; |
917f2f10 | 2090 | } |
1da177e4 | 2091 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2092 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2093 | GFP_KERNEL); | |
1da177e4 LT |
2094 | if (!newpsl) { |
2095 | err = -ENOBUFS; | |
2096 | goto done; | |
2097 | } | |
2098 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2099 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2100 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2101 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2102 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2103 | if (err) { | |
2104 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2105 | goto done; | |
2106 | } | |
8713dbf0 | 2107 | } else { |
1da177e4 | 2108 | newpsl = NULL; |
8713dbf0 YZ |
2109 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2110 | msf->imsf_fmode, 0, NULL, 0); | |
2111 | } | |
1d7138de | 2112 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2113 | if (psl) { |
2114 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2115 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2116 | /* decrease mem now to avoid the memleak warning */ |
2117 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2118 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2119 | } else |
2120 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2121 | 0, NULL, 0); | |
cf778b00 | 2122 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2123 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2124 | err = 0; |
1da177e4 | 2125 | done: |
6756ae4b | 2126 | rtnl_unlock(); |
9951f036 DS |
2127 | if (leavegroup) |
2128 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2129 | return err; |
2130 | } | |
2131 | ||
2132 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2133 | struct ip_msfilter __user *optval, int __user *optlen) | |
2134 | { | |
2135 | int err, len, count, copycount; | |
2136 | struct ip_mreqn imr; | |
63007727 | 2137 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2138 | struct ip_mc_socklist *pmc; |
2139 | struct in_device *in_dev; | |
2140 | struct inet_sock *inet = inet_sk(sk); | |
2141 | struct ip_sf_socklist *psl; | |
877acedc | 2142 | struct net *net = sock_net(sk); |
1da177e4 | 2143 | |
f97c1e0c | 2144 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2145 | return -EINVAL; |
2146 | ||
6756ae4b | 2147 | rtnl_lock(); |
1da177e4 LT |
2148 | |
2149 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2150 | imr.imr_address.s_addr = msf->imsf_interface; | |
2151 | imr.imr_ifindex = 0; | |
877acedc | 2152 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2153 | |
2154 | if (!in_dev) { | |
2155 | err = -ENODEV; | |
2156 | goto done; | |
2157 | } | |
2158 | err = -EADDRNOTAVAIL; | |
2159 | ||
1d7138de | 2160 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2161 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2162 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2163 | break; | |
2164 | } | |
2165 | if (!pmc) /* must have a prior join */ | |
2166 | goto done; | |
2167 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2168 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2169 | rtnl_unlock(); |
1da177e4 LT |
2170 | if (!psl) { |
2171 | len = 0; | |
2172 | count = 0; | |
2173 | } else { | |
2174 | count = psl->sl_count; | |
2175 | } | |
2176 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2177 | len = copycount * sizeof(psl->sl_addr[0]); | |
2178 | msf->imsf_numsrc = count; | |
2179 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2180 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2181 | return -EFAULT; | |
2182 | } | |
2183 | if (len && | |
2184 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2185 | return -EFAULT; | |
2186 | return 0; | |
2187 | done: | |
6756ae4b | 2188 | rtnl_unlock(); |
1da177e4 LT |
2189 | return err; |
2190 | } | |
2191 | ||
2192 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2193 | struct group_filter __user *optval, int __user *optlen) | |
2194 | { | |
2195 | int err, i, count, copycount; | |
2196 | struct sockaddr_in *psin; | |
63007727 | 2197 | __be32 addr; |
1da177e4 LT |
2198 | struct ip_mc_socklist *pmc; |
2199 | struct inet_sock *inet = inet_sk(sk); | |
2200 | struct ip_sf_socklist *psl; | |
2201 | ||
2202 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2203 | if (psin->sin_family != AF_INET) | |
2204 | return -EINVAL; | |
2205 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2206 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2207 | return -EINVAL; |
2208 | ||
6756ae4b | 2209 | rtnl_lock(); |
1da177e4 LT |
2210 | |
2211 | err = -EADDRNOTAVAIL; | |
2212 | ||
1d7138de | 2213 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2214 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2215 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2216 | break; | |
2217 | } | |
2218 | if (!pmc) /* must have a prior join */ | |
2219 | goto done; | |
2220 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2221 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2222 | rtnl_unlock(); |
1da177e4 LT |
2223 | count = psl ? psl->sl_count : 0; |
2224 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2225 | gsf->gf_numsrc = count; | |
2226 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2227 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2228 | return -EFAULT; | |
2229 | } | |
2230 | for (i=0; i<copycount; i++) { | |
1da177e4 LT |
2231 | struct sockaddr_storage ss; |
2232 | ||
2233 | psin = (struct sockaddr_in *)&ss; | |
2234 | memset(&ss, 0, sizeof(ss)); | |
2235 | psin->sin_family = AF_INET; | |
2236 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2237 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2238 | return -EFAULT; | |
2239 | } | |
2240 | return 0; | |
2241 | done: | |
6756ae4b | 2242 | rtnl_unlock(); |
1da177e4 LT |
2243 | return err; |
2244 | } | |
2245 | ||
2246 | /* | |
2247 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2248 | */ | |
c0cda068 | 2249 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2250 | { |
2251 | struct inet_sock *inet = inet_sk(sk); | |
2252 | struct ip_mc_socklist *pmc; | |
2253 | struct ip_sf_socklist *psl; | |
2254 | int i; | |
c85bb41e | 2255 | int ret; |
1da177e4 | 2256 | |
c85bb41e | 2257 | ret = 1; |
f97c1e0c | 2258 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2259 | goto out; |
1da177e4 | 2260 | |
c85bb41e | 2261 | rcu_read_lock(); |
1d7138de | 2262 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2263 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2264 | pmc->multi.imr_ifindex == dif) | |
2265 | break; | |
2266 | } | |
c85bb41e | 2267 | ret = inet->mc_all; |
1da177e4 | 2268 | if (!pmc) |
c85bb41e | 2269 | goto unlock; |
1d7138de | 2270 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2271 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2272 | if (!psl) |
c85bb41e | 2273 | goto unlock; |
1da177e4 LT |
2274 | |
2275 | for (i=0; i<psl->sl_count; i++) { | |
2276 | if (psl->sl_addr[i] == rmt_addr) | |
2277 | break; | |
2278 | } | |
c85bb41e | 2279 | ret = 0; |
1da177e4 | 2280 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2281 | goto unlock; |
1da177e4 | 2282 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2283 | goto unlock; |
2284 | ret = 1; | |
2285 | unlock: | |
2286 | rcu_read_unlock(); | |
2287 | out: | |
2288 | return ret; | |
1da177e4 LT |
2289 | } |
2290 | ||
2291 | /* | |
2292 | * A socket is closing. | |
2293 | */ | |
2294 | ||
2295 | void ip_mc_drop_socket(struct sock *sk) | |
2296 | { | |
2297 | struct inet_sock *inet = inet_sk(sk); | |
2298 | struct ip_mc_socklist *iml; | |
877acedc | 2299 | struct net *net = sock_net(sk); |
1da177e4 LT |
2300 | |
2301 | if (inet->mc_list == NULL) | |
2302 | return; | |
2303 | ||
2304 | rtnl_lock(); | |
1d7138de | 2305 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2306 | struct in_device *in_dev; |
1da177e4 | 2307 | |
1d7138de | 2308 | inet->mc_list = iml->next_rcu; |
877acedc | 2309 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2310 | (void) ip_mc_leave_src(sk, iml, in_dev); |
18943d29 | 2311 | if (in_dev != NULL) |
1da177e4 | 2312 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2313 | /* decrease mem now to avoid the memleak warning */ |
2314 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2315 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2316 | } |
2317 | rtnl_unlock(); | |
2318 | } | |
2319 | ||
dbdd9a52 DM |
2320 | /* called with rcu_read_lock() */ |
2321 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) | |
1da177e4 LT |
2322 | { |
2323 | struct ip_mc_list *im; | |
2324 | struct ip_sf_list *psf; | |
2325 | int rv = 0; | |
2326 | ||
1d7138de | 2327 | for_each_pmc_rcu(in_dev, im) { |
1da177e4 LT |
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 | } | |
1da177e4 LT |
2348 | return rv; |
2349 | } | |
2350 | ||
2351 | #if defined(CONFIG_PROC_FS) | |
2352 | struct igmp_mc_iter_state { | |
7091e728 | 2353 | struct seq_net_private p; |
1da177e4 LT |
2354 | struct net_device *dev; |
2355 | struct in_device *in_dev; | |
2356 | }; | |
2357 | ||
2358 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2359 | ||
2360 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2361 | { | |
7091e728 | 2362 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2363 | struct ip_mc_list *im = NULL; |
2364 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2365 | ||
7562f876 | 2366 | state->in_dev = NULL; |
61fbab77 | 2367 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2368 | struct in_device *in_dev; |
6baff150 ED |
2369 | |
2370 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2371 | if (!in_dev) |
2372 | continue; | |
1d7138de | 2373 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2374 | if (im) { |
2375 | state->in_dev = in_dev; | |
2376 | break; | |
2377 | } | |
1da177e4 LT |
2378 | } |
2379 | return im; | |
2380 | } | |
2381 | ||
2382 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2383 | { | |
2384 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2385 | |
1d7138de ED |
2386 | im = rcu_dereference(im->next_rcu); |
2387 | while (!im) { | |
6baff150 | 2388 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2389 | if (!state->dev) { |
2390 | state->in_dev = NULL; | |
2391 | break; | |
2392 | } | |
6baff150 | 2393 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2394 | if (!state->in_dev) |
2395 | continue; | |
1d7138de | 2396 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2397 | } |
2398 | return im; | |
2399 | } | |
2400 | ||
2401 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2402 | { | |
2403 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2404 | if (im) | |
2405 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2406 | --pos; | |
2407 | return pos ? NULL : im; | |
2408 | } | |
2409 | ||
2410 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2411 | __acquires(rcu) |
1da177e4 | 2412 | { |
61fbab77 | 2413 | rcu_read_lock(); |
1da177e4 LT |
2414 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2415 | } | |
2416 | ||
2417 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2418 | { | |
2419 | struct ip_mc_list *im; | |
2420 | if (v == SEQ_START_TOKEN) | |
2421 | im = igmp_mc_get_first(seq); | |
2422 | else | |
2423 | im = igmp_mc_get_next(seq, v); | |
2424 | ++*pos; | |
2425 | return im; | |
2426 | } | |
2427 | ||
2428 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2429 | __releases(rcu) |
1da177e4 LT |
2430 | { |
2431 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2432 | |
2433 | state->in_dev = NULL; | |
1da177e4 | 2434 | state->dev = NULL; |
61fbab77 | 2435 | rcu_read_unlock(); |
1da177e4 LT |
2436 | } |
2437 | ||
2438 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2439 | { | |
2440 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2441 | seq_puts(seq, |
1da177e4 LT |
2442 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2443 | else { | |
2444 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2445 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2446 | char *querier; | |
a399a805 ED |
2447 | long delta; |
2448 | ||
1da177e4 LT |
2449 | #ifdef CONFIG_IP_MULTICAST |
2450 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2451 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2452 | "V3"; | |
2453 | #else | |
2454 | querier = "NONE"; | |
2455 | #endif | |
2456 | ||
1d7138de | 2457 | if (rcu_dereference(state->in_dev->mc_list) == im) { |
1da177e4 | 2458 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2459 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2460 | } |
2461 | ||
a399a805 | 2462 | delta = im->timer.expires - jiffies; |
1da177e4 | 2463 | seq_printf(seq, |
338fcf98 | 2464 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2465 | im->multiaddr, im->users, |
a399a805 ED |
2466 | im->tm_running, |
2467 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2468 | im->reporter); |
2469 | } | |
2470 | return 0; | |
2471 | } | |
2472 | ||
f690808e | 2473 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2474 | .start = igmp_mc_seq_start, |
2475 | .next = igmp_mc_seq_next, | |
2476 | .stop = igmp_mc_seq_stop, | |
2477 | .show = igmp_mc_seq_show, | |
2478 | }; | |
2479 | ||
2480 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2481 | { | |
7091e728 | 2482 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2483 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2484 | } |
2485 | ||
9a32144e | 2486 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2487 | .owner = THIS_MODULE, |
2488 | .open = igmp_mc_seq_open, | |
2489 | .read = seq_read, | |
2490 | .llseek = seq_lseek, | |
7091e728 | 2491 | .release = seq_release_net, |
1da177e4 LT |
2492 | }; |
2493 | ||
2494 | struct igmp_mcf_iter_state { | |
7091e728 | 2495 | struct seq_net_private p; |
1da177e4 LT |
2496 | struct net_device *dev; |
2497 | struct in_device *idev; | |
2498 | struct ip_mc_list *im; | |
2499 | }; | |
2500 | ||
2501 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2502 | ||
2503 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2504 | { | |
7091e728 | 2505 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2506 | struct ip_sf_list *psf = NULL; |
2507 | struct ip_mc_list *im = NULL; | |
2508 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2509 | ||
7562f876 PE |
2510 | state->idev = NULL; |
2511 | state->im = NULL; | |
61fbab77 | 2512 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2513 | struct in_device *idev; |
6baff150 | 2514 | idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2515 | if (unlikely(idev == NULL)) |
2516 | continue; | |
1d7138de | 2517 | im = rcu_dereference(idev->mc_list); |
1da177e4 LT |
2518 | if (likely(im != NULL)) { |
2519 | spin_lock_bh(&im->lock); | |
2520 | psf = im->sources; | |
2521 | if (likely(psf != NULL)) { | |
2522 | state->im = im; | |
2523 | state->idev = idev; | |
2524 | break; | |
2525 | } | |
2526 | spin_unlock_bh(&im->lock); | |
2527 | } | |
1da177e4 LT |
2528 | } |
2529 | return psf; | |
2530 | } | |
2531 | ||
2532 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2533 | { | |
2534 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2535 | ||
2536 | psf = psf->sf_next; | |
2537 | while (!psf) { | |
2538 | spin_unlock_bh(&state->im->lock); | |
2539 | state->im = state->im->next; | |
2540 | while (!state->im) { | |
6baff150 | 2541 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2542 | if (!state->dev) { |
2543 | state->idev = NULL; | |
2544 | goto out; | |
2545 | } | |
6baff150 | 2546 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2547 | if (!state->idev) |
2548 | continue; | |
1d7138de | 2549 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2550 | } |
2551 | if (!state->im) | |
2552 | break; | |
2553 | spin_lock_bh(&state->im->lock); | |
2554 | psf = state->im->sources; | |
2555 | } | |
2556 | out: | |
2557 | return psf; | |
2558 | } | |
2559 | ||
2560 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2561 | { | |
2562 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2563 | if (psf) | |
2564 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2565 | --pos; | |
2566 | return pos ? NULL : psf; | |
2567 | } | |
2568 | ||
2569 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2570 | __acquires(rcu) |
1da177e4 | 2571 | { |
61fbab77 | 2572 | rcu_read_lock(); |
1da177e4 LT |
2573 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2574 | } | |
2575 | ||
2576 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2577 | { | |
2578 | struct ip_sf_list *psf; | |
2579 | if (v == SEQ_START_TOKEN) | |
2580 | psf = igmp_mcf_get_first(seq); | |
2581 | else | |
2582 | psf = igmp_mcf_get_next(seq, v); | |
2583 | ++*pos; | |
2584 | return psf; | |
2585 | } | |
2586 | ||
2587 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2588 | __releases(rcu) |
1da177e4 LT |
2589 | { |
2590 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2591 | if (likely(state->im != NULL)) { | |
2592 | spin_unlock_bh(&state->im->lock); | |
2593 | state->im = NULL; | |
2594 | } | |
1d7138de | 2595 | state->idev = NULL; |
1da177e4 | 2596 | state->dev = NULL; |
61fbab77 | 2597 | rcu_read_unlock(); |
1da177e4 LT |
2598 | } |
2599 | ||
2600 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2601 | { | |
2602 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2603 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2604 | ||
2605 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2606 | seq_printf(seq, |
1da177e4 LT |
2607 | "%3s %6s " |
2608 | "%10s %10s %6s %6s\n", "Idx", | |
2609 | "Device", "MCA", | |
2610 | "SRC", "INC", "EXC"); | |
2611 | } else { | |
2612 | seq_printf(seq, | |
2613 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2614 | "0x%08x %6lu %6lu\n", |
2615 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2616 | ntohl(state->im->multiaddr), |
2617 | ntohl(psf->sf_inaddr), | |
2618 | psf->sf_count[MCAST_INCLUDE], | |
2619 | psf->sf_count[MCAST_EXCLUDE]); | |
2620 | } | |
2621 | return 0; | |
2622 | } | |
2623 | ||
f690808e | 2624 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2625 | .start = igmp_mcf_seq_start, |
2626 | .next = igmp_mcf_seq_next, | |
2627 | .stop = igmp_mcf_seq_stop, | |
2628 | .show = igmp_mcf_seq_show, | |
2629 | }; | |
2630 | ||
2631 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2632 | { | |
7091e728 | 2633 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2634 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2635 | } |
2636 | ||
9a32144e | 2637 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2638 | .owner = THIS_MODULE, |
2639 | .open = igmp_mcf_seq_open, | |
2640 | .read = seq_read, | |
2641 | .llseek = seq_lseek, | |
7091e728 | 2642 | .release = seq_release_net, |
1da177e4 LT |
2643 | }; |
2644 | ||
2c8c1e72 | 2645 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2646 | { |
7091e728 AD |
2647 | struct proc_dir_entry *pde; |
2648 | ||
2649 | pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); | |
2650 | if (!pde) | |
2651 | goto out_igmp; | |
2652 | pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); | |
2653 | if (!pde) | |
2654 | goto out_mcfilter; | |
1da177e4 | 2655 | return 0; |
7091e728 AD |
2656 | |
2657 | out_mcfilter: | |
2658 | proc_net_remove(net, "igmp"); | |
2659 | out_igmp: | |
2660 | return -ENOMEM; | |
2661 | } | |
2662 | ||
2c8c1e72 | 2663 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 AD |
2664 | { |
2665 | proc_net_remove(net, "mcfilter"); | |
2666 | proc_net_remove(net, "igmp"); | |
2667 | } | |
2668 | ||
2669 | static struct pernet_operations igmp_net_ops = { | |
2670 | .init = igmp_net_init, | |
2671 | .exit = igmp_net_exit, | |
2672 | }; | |
2673 | ||
2674 | int __init igmp_mc_proc_init(void) | |
2675 | { | |
2676 | return register_pernet_subsys(&igmp_net_ops); | |
1da177e4 LT |
2677 | } |
2678 | #endif |