Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
1da177e4 LT |
75 | #include <asm/uaccess.h> |
76 | #include <asm/system.h> | |
77 | #include <linux/types.h> | |
78 | #include <linux/kernel.h> | |
79 | #include <linux/jiffies.h> | |
80 | #include <linux/string.h> | |
81 | #include <linux/socket.h> | |
82 | #include <linux/sockios.h> | |
83 | #include <linux/in.h> | |
84 | #include <linux/inet.h> | |
85 | #include <linux/netdevice.h> | |
86 | #include <linux/skbuff.h> | |
87 | #include <linux/inetdevice.h> | |
88 | #include <linux/igmp.h> | |
89 | #include <linux/if_arp.h> | |
90 | #include <linux/rtnetlink.h> | |
91 | #include <linux/times.h> | |
14c85021 | 92 | |
457c4cbc | 93 | #include <net/net_namespace.h> |
14c85021 | 94 | #include <net/arp.h> |
1da177e4 LT |
95 | #include <net/ip.h> |
96 | #include <net/protocol.h> | |
97 | #include <net/route.h> | |
98 | #include <net/sock.h> | |
99 | #include <net/checksum.h> | |
100 | #include <linux/netfilter_ipv4.h> | |
101 | #ifdef CONFIG_IP_MROUTE | |
102 | #include <linux/mroute.h> | |
103 | #endif | |
104 | #ifdef CONFIG_PROC_FS | |
105 | #include <linux/proc_fs.h> | |
106 | #include <linux/seq_file.h> | |
107 | #endif | |
108 | ||
109 | #define IP_MAX_MEMBERSHIPS 20 | |
110 | #define IP_MAX_MSF 10 | |
111 | ||
112 | #ifdef CONFIG_IP_MULTICAST | |
113 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
114 | ||
115 | #define IGMP_V1_Router_Present_Timeout (400*HZ) | |
116 | #define IGMP_V2_Router_Present_Timeout (400*HZ) | |
117 | #define IGMP_Unsolicited_Report_Interval (10*HZ) | |
118 | #define IGMP_Query_Response_Interval (10*HZ) | |
119 | #define IGMP_Unsolicited_Report_Count 2 | |
120 | ||
121 | ||
122 | #define IGMP_Initial_Report_Delay (1) | |
123 | ||
124 | /* IGMP_Initial_Report_Delay is not from IGMP specs! | |
125 | * IGMP specs require to report membership immediately after | |
126 | * joining a group, but we delay the first report by a | |
127 | * small interval. It seems more natural and still does not | |
128 | * contradict to specs provided this delay is small enough. | |
129 | */ | |
130 | ||
42f811b8 | 131 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 132 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
133 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
134 | ((in_dev)->mr_v1_seen && \ | |
135 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
136 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 137 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
138 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
139 | ((in_dev)->mr_v2_seen && \ | |
140 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 LT |
141 | |
142 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); | |
63007727 | 143 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); |
1da177e4 LT |
144 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
145 | static int sf_setstate(struct ip_mc_list *pmc); | |
146 | static void sf_markstate(struct ip_mc_list *pmc); | |
147 | #endif | |
148 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
149 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
150 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
151 | |
152 | static void ip_ma_put(struct ip_mc_list *im) | |
153 | { | |
154 | if (atomic_dec_and_test(&im->refcnt)) { | |
155 | in_dev_put(im->interface); | |
42ea299d | 156 | kfree_rcu(im, rcu); |
1da177e4 LT |
157 | } |
158 | } | |
159 | ||
d9aa9380 DM |
160 | #define for_each_pmc_rcu(in_dev, pmc) \ |
161 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
162 | pmc != NULL; \ | |
163 | pmc = rcu_dereference(pmc->next_rcu)) | |
164 | ||
165 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
166 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
167 | pmc != NULL; \ | |
168 | pmc = rtnl_dereference(pmc->next_rcu)) | |
169 | ||
1da177e4 LT |
170 | #ifdef CONFIG_IP_MULTICAST |
171 | ||
172 | /* | |
173 | * Timer management | |
174 | */ | |
175 | ||
1d7138de | 176 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
177 | { |
178 | spin_lock_bh(&im->lock); | |
179 | if (del_timer(&im->timer)) | |
180 | atomic_dec(&im->refcnt); | |
a7e9ff73 | 181 | im->tm_running = 0; |
1da177e4 LT |
182 | im->reporter = 0; |
183 | im->unsolicit_count = 0; | |
184 | spin_unlock_bh(&im->lock); | |
185 | } | |
186 | ||
187 | /* It must be called with locked im->lock */ | |
188 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
189 | { | |
a7e9ff73 | 190 | int tv = net_random() % max_delay; |
1da177e4 | 191 | |
a7e9ff73 | 192 | im->tm_running = 1; |
1da177e4 LT |
193 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
194 | atomic_inc(&im->refcnt); | |
195 | } | |
196 | ||
197 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
198 | { | |
199 | int tv = net_random() % in_dev->mr_maxdelay; | |
200 | ||
201 | in_dev->mr_gq_running = 1; | |
202 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
203 | in_dev_hold(in_dev); | |
204 | } | |
205 | ||
206 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
207 | { | |
208 | int tv = net_random() % delay; | |
209 | ||
210 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
211 | in_dev_hold(in_dev); | |
212 | } | |
213 | ||
214 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
215 | { | |
216 | spin_lock_bh(&im->lock); | |
217 | im->unsolicit_count = 0; | |
218 | if (del_timer(&im->timer)) { | |
219 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
220 | add_timer(&im->timer); | |
a7e9ff73 | 221 | im->tm_running = 1; |
1da177e4 LT |
222 | spin_unlock_bh(&im->lock); |
223 | return; | |
224 | } | |
225 | atomic_dec(&im->refcnt); | |
226 | } | |
227 | igmp_start_timer(im, max_delay); | |
228 | spin_unlock_bh(&im->lock); | |
229 | } | |
230 | ||
231 | ||
232 | /* | |
233 | * Send an IGMP report. | |
234 | */ | |
235 | ||
236 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
237 | ||
238 | ||
239 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
240 | int gdeleted, int sdeleted) | |
241 | { | |
242 | switch (type) { | |
243 | case IGMPV3_MODE_IS_INCLUDE: | |
244 | case IGMPV3_MODE_IS_EXCLUDE: | |
245 | if (gdeleted || sdeleted) | |
246 | return 0; | |
ad12583f DS |
247 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
248 | if (pmc->sfmode == MCAST_INCLUDE) | |
249 | return 1; | |
250 | /* don't include if this source is excluded | |
251 | * in all filters | |
252 | */ | |
253 | if (psf->sf_count[MCAST_INCLUDE]) | |
254 | return type == IGMPV3_MODE_IS_INCLUDE; | |
255 | return pmc->sfcount[MCAST_EXCLUDE] == | |
256 | psf->sf_count[MCAST_EXCLUDE]; | |
257 | } | |
258 | return 0; | |
1da177e4 LT |
259 | case IGMPV3_CHANGE_TO_INCLUDE: |
260 | if (gdeleted || sdeleted) | |
261 | return 0; | |
262 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
263 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
264 | if (gdeleted || sdeleted) | |
265 | return 0; | |
266 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
267 | psf->sf_count[MCAST_INCLUDE]) | |
268 | return 0; | |
269 | return pmc->sfcount[MCAST_EXCLUDE] == | |
270 | psf->sf_count[MCAST_EXCLUDE]; | |
271 | case IGMPV3_ALLOW_NEW_SOURCES: | |
272 | if (gdeleted || !psf->sf_crcount) | |
273 | return 0; | |
274 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
275 | case IGMPV3_BLOCK_OLD_SOURCES: | |
276 | if (pmc->sfmode == MCAST_INCLUDE) | |
277 | return gdeleted || (psf->sf_crcount && sdeleted); | |
278 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
279 | } | |
280 | return 0; | |
281 | } | |
282 | ||
283 | static int | |
284 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
285 | { | |
286 | struct ip_sf_list *psf; | |
287 | int scount = 0; | |
288 | ||
289 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
290 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) | |
291 | continue; | |
292 | scount++; | |
293 | } | |
294 | return scount; | |
295 | } | |
296 | ||
57e1ab6e ED |
297 | #define igmp_skb_size(skb) (*(unsigned int *)((skb)->cb)) |
298 | ||
1da177e4 LT |
299 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size) |
300 | { | |
301 | struct sk_buff *skb; | |
302 | struct rtable *rt; | |
303 | struct iphdr *pip; | |
304 | struct igmpv3_report *pig; | |
877acedc | 305 | struct net *net = dev_net(dev); |
31e4543d | 306 | struct flowi4 fl4; |
66088243 HX |
307 | int hlen = LL_RESERVED_SPACE(dev); |
308 | int tlen = dev->needed_tailroom; | |
1da177e4 | 309 | |
57e1ab6e | 310 | while (1) { |
66088243 | 311 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
312 | GFP_ATOMIC | __GFP_NOWARN); |
313 | if (skb) | |
314 | break; | |
315 | size >>= 1; | |
316 | if (size < 256) | |
317 | return NULL; | |
318 | } | |
319 | igmp_skb_size(skb) = size; | |
1da177e4 | 320 | |
31e4543d | 321 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
322 | 0, 0, |
323 | IPPROTO_IGMP, 0, dev->ifindex); | |
324 | if (IS_ERR(rt)) { | |
325 | kfree_skb(skb); | |
326 | return NULL; | |
1da177e4 | 327 | } |
1da177e4 | 328 | |
d8d1f30b | 329 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
330 | skb->dev = dev; |
331 | ||
66088243 | 332 | skb_reserve(skb, hlen); |
1da177e4 | 333 | |
7e28ecc2 | 334 | skb_reset_network_header(skb); |
eddc9ec5 | 335 | pip = ip_hdr(skb); |
7e28ecc2 | 336 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
337 | |
338 | pip->version = 4; | |
339 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
340 | pip->tos = 0xc0; | |
341 | pip->frag_off = htons(IP_DF); | |
342 | pip->ttl = 1; | |
492f64ce DM |
343 | pip->daddr = fl4.daddr; |
344 | pip->saddr = fl4.saddr; | |
1da177e4 LT |
345 | pip->protocol = IPPROTO_IGMP; |
346 | pip->tot_len = 0; /* filled in later */ | |
d8d1f30b | 347 | ip_select_ident(pip, &rt->dst, NULL); |
1da177e4 LT |
348 | ((u8*)&pip[1])[0] = IPOPT_RA; |
349 | ((u8*)&pip[1])[1] = 4; | |
350 | ((u8*)&pip[1])[2] = 0; | |
351 | ((u8*)&pip[1])[3] = 0; | |
352 | ||
b0e380b1 | 353 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 354 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 355 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
356 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
357 | pig->resv1 = 0; | |
358 | pig->csum = 0; | |
359 | pig->resv2 = 0; | |
360 | pig->ngrec = 0; | |
361 | return skb; | |
362 | } | |
363 | ||
364 | static int igmpv3_sendpack(struct sk_buff *skb) | |
365 | { | |
d9edf9e2 | 366 | struct igmphdr *pig = igmp_hdr(skb); |
27a884dc | 367 | const int igmplen = skb->tail - skb->transport_header; |
1da177e4 | 368 | |
d9edf9e2 | 369 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 370 | |
c439cb2e | 371 | return ip_local_out(skb); |
1da177e4 LT |
372 | } |
373 | ||
374 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
375 | { | |
a7e9ff73 | 376 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
377 | } |
378 | ||
379 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
380 | int type, struct igmpv3_grec **ppgr) | |
381 | { | |
382 | struct net_device *dev = pmc->interface->dev; | |
383 | struct igmpv3_report *pih; | |
384 | struct igmpv3_grec *pgr; | |
385 | ||
386 | if (!skb) | |
387 | skb = igmpv3_newpack(dev, dev->mtu); | |
388 | if (!skb) | |
389 | return NULL; | |
390 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
391 | pgr->grec_type = type; | |
392 | pgr->grec_auxwords = 0; | |
393 | pgr->grec_nsrcs = 0; | |
394 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 395 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
396 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
397 | *ppgr = pgr; | |
398 | return skb; | |
399 | } | |
400 | ||
57e1ab6e | 401 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \ |
1da177e4 LT |
402 | skb_tailroom(skb)) : 0) |
403 | ||
404 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
405 | int type, int gdeleted, int sdeleted) | |
406 | { | |
407 | struct net_device *dev = pmc->interface->dev; | |
408 | struct igmpv3_report *pih; | |
409 | struct igmpv3_grec *pgr = NULL; | |
410 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 411 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
412 | |
413 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
414 | return skb; | |
415 | ||
416 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
417 | type == IGMPV3_MODE_IS_EXCLUDE; | |
418 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
419 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
420 | ||
ad12583f DS |
421 | stotal = scount = 0; |
422 | ||
1da177e4 LT |
423 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
424 | ||
ad12583f DS |
425 | if (!*psf_list) |
426 | goto empty_source; | |
427 | ||
d9edf9e2 | 428 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
429 | |
430 | /* EX and TO_EX get a fresh packet, if needed */ | |
431 | if (truncate) { | |
432 | if (pih && pih->ngrec && | |
433 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
434 | if (skb) | |
435 | igmpv3_sendpack(skb); | |
436 | skb = igmpv3_newpack(dev, dev->mtu); | |
437 | } | |
438 | } | |
439 | first = 1; | |
1da177e4 LT |
440 | psf_prev = NULL; |
441 | for (psf=*psf_list; psf; psf=psf_next) { | |
ea4d9e72 | 442 | __be32 *psrc; |
1da177e4 LT |
443 | |
444 | psf_next = psf->sf_next; | |
445 | ||
446 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
447 | psf_prev = psf; | |
448 | continue; | |
449 | } | |
450 | ||
451 | /* clear marks on query responses */ | |
452 | if (isquery) | |
453 | psf->sf_gsresp = 0; | |
454 | ||
63007727 | 455 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
456 | first*sizeof(struct igmpv3_grec)) { |
457 | if (truncate && !first) | |
458 | break; /* truncate these */ | |
459 | if (pgr) | |
460 | pgr->grec_nsrcs = htons(scount); | |
461 | if (skb) | |
462 | igmpv3_sendpack(skb); | |
463 | skb = igmpv3_newpack(dev, dev->mtu); | |
464 | first = 1; | |
465 | scount = 0; | |
466 | } | |
467 | if (first) { | |
468 | skb = add_grhead(skb, pmc, type, &pgr); | |
469 | first = 0; | |
470 | } | |
cc63f70b AD |
471 | if (!skb) |
472 | return NULL; | |
63007727 | 473 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 474 | *psrc = psf->sf_inaddr; |
ad12583f | 475 | scount++; stotal++; |
1da177e4 LT |
476 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
477 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
478 | psf->sf_crcount--; | |
479 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
480 | if (psf_prev) | |
481 | psf_prev->sf_next = psf->sf_next; | |
482 | else | |
483 | *psf_list = psf->sf_next; | |
484 | kfree(psf); | |
485 | continue; | |
486 | } | |
487 | } | |
488 | psf_prev = psf; | |
489 | } | |
ad12583f DS |
490 | |
491 | empty_source: | |
492 | if (!stotal) { | |
493 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
494 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
495 | return skb; | |
496 | if (pmc->crcount || isquery) { | |
497 | /* make sure we have room for group header */ | |
498 | if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { | |
499 | igmpv3_sendpack(skb); | |
500 | skb = NULL; /* add_grhead will get a new one */ | |
501 | } | |
502 | skb = add_grhead(skb, pmc, type, &pgr); | |
503 | } | |
504 | } | |
1da177e4 LT |
505 | if (pgr) |
506 | pgr->grec_nsrcs = htons(scount); | |
507 | ||
508 | if (isquery) | |
509 | pmc->gsquery = 0; /* clear query state on report */ | |
510 | return skb; | |
511 | } | |
512 | ||
513 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
514 | { | |
515 | struct sk_buff *skb = NULL; | |
516 | int type; | |
517 | ||
518 | if (!pmc) { | |
1d7138de ED |
519 | rcu_read_lock(); |
520 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
521 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
522 | continue; | |
523 | spin_lock_bh(&pmc->lock); | |
524 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
525 | type = IGMPV3_MODE_IS_EXCLUDE; | |
526 | else | |
527 | type = IGMPV3_MODE_IS_INCLUDE; | |
528 | skb = add_grec(skb, pmc, type, 0, 0); | |
529 | spin_unlock_bh(&pmc->lock); | |
530 | } | |
1d7138de | 531 | rcu_read_unlock(); |
1da177e4 LT |
532 | } else { |
533 | spin_lock_bh(&pmc->lock); | |
534 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
535 | type = IGMPV3_MODE_IS_EXCLUDE; | |
536 | else | |
537 | type = IGMPV3_MODE_IS_INCLUDE; | |
538 | skb = add_grec(skb, pmc, type, 0, 0); | |
539 | spin_unlock_bh(&pmc->lock); | |
540 | } | |
541 | if (!skb) | |
542 | return 0; | |
543 | return igmpv3_sendpack(skb); | |
544 | } | |
545 | ||
546 | /* | |
547 | * remove zero-count source records from a source filter list | |
548 | */ | |
549 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
550 | { | |
551 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
552 | ||
553 | psf_prev = NULL; | |
554 | for (psf=*ppsf; psf; psf = psf_next) { | |
555 | psf_next = psf->sf_next; | |
556 | if (psf->sf_crcount == 0) { | |
557 | if (psf_prev) | |
558 | psf_prev->sf_next = psf->sf_next; | |
559 | else | |
560 | *ppsf = psf->sf_next; | |
561 | kfree(psf); | |
562 | } else | |
563 | psf_prev = psf; | |
564 | } | |
565 | } | |
566 | ||
567 | static void igmpv3_send_cr(struct in_device *in_dev) | |
568 | { | |
569 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
570 | struct sk_buff *skb = NULL; | |
571 | int type, dtype; | |
572 | ||
1d7138de | 573 | rcu_read_lock(); |
1da177e4 LT |
574 | spin_lock_bh(&in_dev->mc_tomb_lock); |
575 | ||
576 | /* deleted MCA's */ | |
577 | pmc_prev = NULL; | |
578 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { | |
579 | pmc_next = pmc->next; | |
580 | if (pmc->sfmode == MCAST_INCLUDE) { | |
581 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
582 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
583 | skb = add_grec(skb, pmc, type, 1, 0); | |
584 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
585 | } | |
586 | if (pmc->crcount) { | |
1da177e4 LT |
587 | if (pmc->sfmode == MCAST_EXCLUDE) { |
588 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
589 | skb = add_grec(skb, pmc, type, 1, 0); | |
590 | } | |
ad12583f | 591 | pmc->crcount--; |
1da177e4 LT |
592 | if (pmc->crcount == 0) { |
593 | igmpv3_clear_zeros(&pmc->tomb); | |
594 | igmpv3_clear_zeros(&pmc->sources); | |
595 | } | |
596 | } | |
597 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
598 | if (pmc_prev) | |
599 | pmc_prev->next = pmc_next; | |
600 | else | |
601 | in_dev->mc_tomb = pmc_next; | |
602 | in_dev_put(pmc->interface); | |
603 | kfree(pmc); | |
604 | } else | |
605 | pmc_prev = pmc; | |
606 | } | |
607 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
608 | ||
609 | /* change recs */ | |
1d7138de | 610 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
611 | spin_lock_bh(&pmc->lock); |
612 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
613 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
614 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
615 | } else { | |
616 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
617 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
618 | } | |
619 | skb = add_grec(skb, pmc, type, 0, 0); | |
620 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
621 | ||
622 | /* filter mode changes */ | |
623 | if (pmc->crcount) { | |
1da177e4 LT |
624 | if (pmc->sfmode == MCAST_EXCLUDE) |
625 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
626 | else | |
627 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
628 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 629 | pmc->crcount--; |
1da177e4 LT |
630 | } |
631 | spin_unlock_bh(&pmc->lock); | |
632 | } | |
1d7138de | 633 | rcu_read_unlock(); |
1da177e4 LT |
634 | |
635 | if (!skb) | |
636 | return; | |
637 | (void) igmpv3_sendpack(skb); | |
638 | } | |
639 | ||
640 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
641 | int type) | |
642 | { | |
643 | struct sk_buff *skb; | |
644 | struct iphdr *iph; | |
645 | struct igmphdr *ih; | |
646 | struct rtable *rt; | |
647 | struct net_device *dev = in_dev->dev; | |
877acedc | 648 | struct net *net = dev_net(dev); |
63007727 | 649 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 650 | struct flowi4 fl4; |
63007727 | 651 | __be32 dst; |
66088243 | 652 | int hlen, tlen; |
1da177e4 LT |
653 | |
654 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
655 | return igmpv3_send_report(in_dev, pmc); | |
656 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
657 | dst = IGMP_ALL_ROUTER; | |
658 | else | |
659 | dst = group; | |
660 | ||
31e4543d | 661 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
662 | 0, 0, |
663 | IPPROTO_IGMP, 0, dev->ifindex); | |
664 | if (IS_ERR(rt)) | |
665 | return -1; | |
666 | ||
66088243 HX |
667 | hlen = LL_RESERVED_SPACE(dev); |
668 | tlen = dev->needed_tailroom; | |
669 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
1da177e4 LT |
670 | if (skb == NULL) { |
671 | ip_rt_put(rt); | |
672 | return -1; | |
673 | } | |
674 | ||
d8d1f30b | 675 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 676 | |
66088243 | 677 | skb_reserve(skb, hlen); |
1da177e4 | 678 | |
7e28ecc2 | 679 | skb_reset_network_header(skb); |
eddc9ec5 | 680 | iph = ip_hdr(skb); |
7e28ecc2 | 681 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
682 | |
683 | iph->version = 4; | |
684 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
685 | iph->tos = 0xc0; | |
686 | iph->frag_off = htons(IP_DF); | |
687 | iph->ttl = 1; | |
688 | iph->daddr = dst; | |
492f64ce | 689 | iph->saddr = fl4.saddr; |
1da177e4 | 690 | iph->protocol = IPPROTO_IGMP; |
d8d1f30b | 691 | ip_select_ident(iph, &rt->dst, NULL); |
1da177e4 LT |
692 | ((u8*)&iph[1])[0] = IPOPT_RA; |
693 | ((u8*)&iph[1])[1] = 4; | |
694 | ((u8*)&iph[1])[2] = 0; | |
695 | ((u8*)&iph[1])[3] = 0; | |
1da177e4 LT |
696 | |
697 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
698 | ih->type = type; |
699 | ih->code = 0; | |
700 | ih->csum = 0; | |
701 | ih->group = group; | |
702 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 703 | |
c439cb2e | 704 | return ip_local_out(skb); |
1da177e4 LT |
705 | } |
706 | ||
707 | static void igmp_gq_timer_expire(unsigned long data) | |
708 | { | |
709 | struct in_device *in_dev = (struct in_device *)data; | |
710 | ||
711 | in_dev->mr_gq_running = 0; | |
712 | igmpv3_send_report(in_dev, NULL); | |
713 | __in_dev_put(in_dev); | |
714 | } | |
715 | ||
716 | static void igmp_ifc_timer_expire(unsigned long data) | |
717 | { | |
718 | struct in_device *in_dev = (struct in_device *)data; | |
719 | ||
720 | igmpv3_send_cr(in_dev); | |
721 | if (in_dev->mr_ifc_count) { | |
722 | in_dev->mr_ifc_count--; | |
723 | igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); | |
724 | } | |
725 | __in_dev_put(in_dev); | |
726 | } | |
727 | ||
728 | static void igmp_ifc_event(struct in_device *in_dev) | |
729 | { | |
730 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
731 | return; | |
e905a9ed | 732 | in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
733 | IGMP_Unsolicited_Report_Count; |
734 | igmp_ifc_start_timer(in_dev, 1); | |
735 | } | |
736 | ||
737 | ||
738 | static void igmp_timer_expire(unsigned long data) | |
739 | { | |
740 | struct ip_mc_list *im=(struct ip_mc_list *)data; | |
741 | struct in_device *in_dev = im->interface; | |
742 | ||
743 | spin_lock(&im->lock); | |
a7e9ff73 | 744 | im->tm_running = 0; |
1da177e4 LT |
745 | |
746 | if (im->unsolicit_count) { | |
747 | im->unsolicit_count--; | |
748 | igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); | |
749 | } | |
750 | im->reporter = 1; | |
751 | spin_unlock(&im->lock); | |
752 | ||
753 | if (IGMP_V1_SEEN(in_dev)) | |
754 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
755 | else if (IGMP_V2_SEEN(in_dev)) | |
756 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
757 | else | |
758 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
759 | ||
760 | ip_ma_put(im); | |
761 | } | |
762 | ||
ad12583f | 763 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 764 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
765 | { |
766 | struct ip_sf_list *psf; | |
767 | int i, scount; | |
768 | ||
ad12583f DS |
769 | scount = 0; |
770 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
771 | if (scount == nsrcs) | |
772 | break; | |
773 | for (i=0; i<nsrcs; i++) { | |
774 | /* skip inactive filters */ | |
e05c4ad3 | 775 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
776 | pmc->sfcount[MCAST_EXCLUDE] != |
777 | psf->sf_count[MCAST_EXCLUDE]) | |
778 | continue; | |
779 | if (srcs[i] == psf->sf_inaddr) { | |
780 | scount++; | |
781 | break; | |
782 | } | |
783 | } | |
784 | } | |
785 | pmc->gsquery = 0; | |
786 | if (scount == nsrcs) /* all sources excluded */ | |
787 | return 0; | |
788 | return 1; | |
789 | } | |
790 | ||
ea4d9e72 | 791 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
792 | { |
793 | struct ip_sf_list *psf; | |
794 | int i, scount; | |
795 | ||
796 | if (pmc->sfmode == MCAST_EXCLUDE) | |
797 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
798 | ||
799 | /* mark INCLUDE-mode sources */ | |
1da177e4 LT |
800 | scount = 0; |
801 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
802 | if (scount == nsrcs) | |
803 | break; | |
804 | for (i=0; i<nsrcs; i++) | |
805 | if (srcs[i] == psf->sf_inaddr) { | |
806 | psf->sf_gsresp = 1; | |
807 | scount++; | |
808 | break; | |
809 | } | |
810 | } | |
ad12583f DS |
811 | if (!scount) { |
812 | pmc->gsquery = 0; | |
813 | return 0; | |
814 | } | |
815 | pmc->gsquery = 1; | |
816 | return 1; | |
1da177e4 LT |
817 | } |
818 | ||
63007727 | 819 | static void 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) | |
826 | return; | |
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(); |
1da177e4 LT |
836 | } |
837 | ||
838 | static void igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
839 | int len) | |
840 | { | |
d9edf9e2 ACM |
841 | struct igmphdr *ih = igmp_hdr(skb); |
842 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 843 | struct ip_mc_list *im; |
63007727 | 844 | __be32 group = ih->group; |
1da177e4 LT |
845 | int max_delay; |
846 | int mark = 0; | |
847 | ||
848 | ||
5b7c8406 | 849 | if (len == 8) { |
1da177e4 LT |
850 | if (ih->code == 0) { |
851 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 852 | |
1da177e4 LT |
853 | max_delay = IGMP_Query_Response_Interval; |
854 | in_dev->mr_v1_seen = jiffies + | |
855 | IGMP_V1_Router_Present_Timeout; | |
856 | group = 0; | |
857 | } else { | |
858 | /* v2 router present */ | |
859 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
860 | in_dev->mr_v2_seen = jiffies + | |
861 | IGMP_V2_Router_Present_Timeout; | |
862 | } | |
863 | /* cancel the interface change timer */ | |
864 | in_dev->mr_ifc_count = 0; | |
865 | if (del_timer(&in_dev->mr_ifc_timer)) | |
866 | __in_dev_put(in_dev); | |
867 | /* clear deleted report items */ | |
868 | igmpv3_clear_delrec(in_dev); | |
869 | } else if (len < 12) { | |
870 | return; /* ignore bogus packet; freed by caller */ | |
5b7c8406 DS |
871 | } else if (IGMP_V1_SEEN(in_dev)) { |
872 | /* This is a v3 query with v1 queriers present */ | |
873 | max_delay = IGMP_Query_Response_Interval; | |
874 | group = 0; | |
875 | } else if (IGMP_V2_SEEN(in_dev)) { | |
876 | /* this is a v3 query with v2 queriers present; | |
877 | * Interpretation of the max_delay code is problematic here. | |
878 | * A real v2 host would use ih_code directly, while v3 has a | |
879 | * different encoding. We use the v3 encoding as more likely | |
880 | * to be intended in a v3 query. | |
881 | */ | |
882 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
1da177e4 LT |
883 | } else { /* v3 */ |
884 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
885 | return; | |
e905a9ed | 886 | |
d9edf9e2 | 887 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 888 | if (ih3->nsrcs) { |
e905a9ed | 889 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 890 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
1da177e4 | 891 | return; |
d9edf9e2 | 892 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
893 | } |
894 | ||
895 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
896 | if (!max_delay) | |
897 | max_delay = 1; /* can't mod w/ 0 */ | |
898 | in_dev->mr_maxdelay = max_delay; | |
899 | if (ih3->qrv) | |
900 | in_dev->mr_qrv = ih3->qrv; | |
901 | if (!group) { /* general query */ | |
902 | if (ih3->nsrcs) | |
903 | return; /* no sources allowed */ | |
904 | igmp_gq_start_timer(in_dev); | |
905 | return; | |
906 | } | |
907 | /* mark sources to include, if group & source-specific */ | |
908 | mark = ih3->nsrcs != 0; | |
909 | } | |
910 | ||
911 | /* | |
912 | * - Start the timers in all of our membership records | |
913 | * that the query applies to for the interface on | |
914 | * which the query arrived excl. those that belong | |
915 | * to a "local" group (224.0.0.X) | |
916 | * - For timers already running check if they need to | |
917 | * be reset. | |
918 | * - Use the igmp->igmp_code field as the maximum | |
919 | * delay possible | |
920 | */ | |
1d7138de ED |
921 | rcu_read_lock(); |
922 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
923 | int changed; |
924 | ||
1da177e4 LT |
925 | if (group && group != im->multiaddr) |
926 | continue; | |
927 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
928 | continue; | |
929 | spin_lock_bh(&im->lock); | |
930 | if (im->tm_running) | |
931 | im->gsquery = im->gsquery && mark; | |
932 | else | |
933 | im->gsquery = mark; | |
ad12583f | 934 | changed = !im->gsquery || |
e905a9ed | 935 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 936 | spin_unlock_bh(&im->lock); |
ad12583f DS |
937 | if (changed) |
938 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 939 | } |
1d7138de | 940 | rcu_read_unlock(); |
1da177e4 LT |
941 | } |
942 | ||
9a57a9d2 | 943 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
944 | int igmp_rcv(struct sk_buff *skb) |
945 | { | |
946 | /* This basically follows the spec line by line -- see RFC1112 */ | |
947 | struct igmphdr *ih; | |
9a57a9d2 | 948 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 LT |
949 | int len = skb->len; |
950 | ||
cd557bc1 DL |
951 | if (in_dev == NULL) |
952 | goto drop; | |
1da177e4 | 953 | |
fb286bb2 | 954 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 955 | goto drop; |
fb286bb2 HX |
956 | |
957 | switch (skb->ip_summed) { | |
84fa7933 | 958 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 959 | if (!csum_fold(skb->csum)) |
fb286bb2 HX |
960 | break; |
961 | /* fall through */ | |
962 | case CHECKSUM_NONE: | |
963 | skb->csum = 0; | |
964 | if (__skb_checksum_complete(skb)) | |
9a57a9d2 | 965 | goto drop; |
1da177e4 LT |
966 | } |
967 | ||
d9edf9e2 | 968 | ih = igmp_hdr(skb); |
1da177e4 LT |
969 | switch (ih->type) { |
970 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
971 | igmp_heard_query(in_dev, skb, len); | |
972 | break; | |
973 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
974 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 975 | /* Is it our report looped back? */ |
c7537967 | 976 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 977 | break; |
24c69275 DS |
978 | /* don't rely on MC router hearing unicast reports */ |
979 | if (skb->pkt_type == PACKET_MULTICAST || | |
980 | skb->pkt_type == PACKET_BROADCAST) | |
981 | igmp_heard_report(in_dev, ih->group); | |
1da177e4 LT |
982 | break; |
983 | case IGMP_PIM: | |
984 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
985 | return pim_rcv_v1(skb); |
986 | #endif | |
c6b471e6 | 987 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
988 | case IGMP_DVMRP: |
989 | case IGMP_TRACE: | |
990 | case IGMP_HOST_LEAVE_MESSAGE: | |
991 | case IGMP_MTRACE: | |
992 | case IGMP_MTRACE_RESP: | |
993 | break; | |
994 | default: | |
dd1c1853 | 995 | break; |
1da177e4 | 996 | } |
fb286bb2 | 997 | |
cd557bc1 | 998 | drop: |
1da177e4 LT |
999 | kfree_skb(skb); |
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | #endif | |
1004 | ||
1005 | ||
1006 | /* | |
1007 | * Add a filter to a device | |
1008 | */ | |
1009 | ||
63007727 | 1010 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1011 | { |
1012 | char buf[MAX_ADDR_LEN]; | |
1013 | struct net_device *dev = in_dev->dev; | |
1014 | ||
1015 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1016 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1017 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1018 | routine. Something sort of: |
1019 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1020 | --ANK | |
1021 | */ | |
1022 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1023 | dev_mc_add(dev, buf); |
1da177e4 LT |
1024 | } |
1025 | ||
1026 | /* | |
1027 | * Remove a filter from a device | |
1028 | */ | |
1029 | ||
63007727 | 1030 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1031 | { |
1032 | char buf[MAX_ADDR_LEN]; | |
1033 | struct net_device *dev = in_dev->dev; | |
1034 | ||
1035 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1036 | dev_mc_del(dev, buf); |
1da177e4 LT |
1037 | } |
1038 | ||
1039 | #ifdef CONFIG_IP_MULTICAST | |
1040 | /* | |
1041 | * deleted ip_mc_list manipulation | |
1042 | */ | |
1043 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1044 | { | |
1045 | struct ip_mc_list *pmc; | |
1046 | ||
1047 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1048 | * are actually used. In particular, the refcnt and users are not | |
1049 | * used for management of the delete list. Using the same structure | |
1050 | * for deleted items allows change reports to use common code with | |
1051 | * non-deleted or query-response MCA's. | |
1052 | */ | |
0da974f4 | 1053 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1054 | if (!pmc) |
1055 | return; | |
1da177e4 LT |
1056 | spin_lock_bh(&im->lock); |
1057 | pmc->interface = im->interface; | |
1058 | in_dev_hold(in_dev); | |
1059 | pmc->multiaddr = im->multiaddr; | |
1060 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1061 | IGMP_Unsolicited_Report_Count; | |
1062 | pmc->sfmode = im->sfmode; | |
1063 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1064 | struct ip_sf_list *psf; | |
1065 | ||
1066 | pmc->tomb = im->tomb; | |
1067 | pmc->sources = im->sources; | |
1068 | im->tomb = im->sources = NULL; | |
1069 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1070 | psf->sf_crcount = pmc->crcount; | |
1071 | } | |
1072 | spin_unlock_bh(&im->lock); | |
1073 | ||
1074 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1075 | pmc->next = in_dev->mc_tomb; | |
1076 | in_dev->mc_tomb = pmc; | |
1077 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1078 | } | |
1079 | ||
63007727 | 1080 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1081 | { |
1082 | struct ip_mc_list *pmc, *pmc_prev; | |
1083 | struct ip_sf_list *psf, *psf_next; | |
1084 | ||
1085 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1086 | pmc_prev = NULL; | |
1087 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { | |
1088 | if (pmc->multiaddr == multiaddr) | |
1089 | break; | |
1090 | pmc_prev = pmc; | |
1091 | } | |
1092 | if (pmc) { | |
1093 | if (pmc_prev) | |
1094 | pmc_prev->next = pmc->next; | |
1095 | else | |
1096 | in_dev->mc_tomb = pmc->next; | |
1097 | } | |
1098 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1099 | if (pmc) { | |
1100 | for (psf=pmc->tomb; psf; psf=psf_next) { | |
1101 | psf_next = psf->sf_next; | |
1102 | kfree(psf); | |
1103 | } | |
1104 | in_dev_put(pmc->interface); | |
1105 | kfree(pmc); | |
1106 | } | |
1107 | } | |
1108 | ||
1109 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1110 | { | |
1111 | struct ip_mc_list *pmc, *nextpmc; | |
1112 | ||
1113 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1114 | pmc = in_dev->mc_tomb; | |
1115 | in_dev->mc_tomb = NULL; | |
1116 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1117 | ||
1118 | for (; pmc; pmc = nextpmc) { | |
1119 | nextpmc = pmc->next; | |
1120 | ip_mc_clear_src(pmc); | |
1121 | in_dev_put(pmc->interface); | |
1122 | kfree(pmc); | |
1123 | } | |
1124 | /* clear dead sources, too */ | |
1d7138de ED |
1125 | rcu_read_lock(); |
1126 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1127 | struct ip_sf_list *psf, *psf_next; |
1128 | ||
1129 | spin_lock_bh(&pmc->lock); | |
1130 | psf = pmc->tomb; | |
1131 | pmc->tomb = NULL; | |
1132 | spin_unlock_bh(&pmc->lock); | |
1133 | for (; psf; psf=psf_next) { | |
1134 | psf_next = psf->sf_next; | |
1135 | kfree(psf); | |
1136 | } | |
1137 | } | |
1d7138de | 1138 | rcu_read_unlock(); |
1da177e4 LT |
1139 | } |
1140 | #endif | |
1141 | ||
1142 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1143 | { | |
1144 | struct in_device *in_dev = im->interface; | |
1145 | #ifdef CONFIG_IP_MULTICAST | |
1146 | int reporter; | |
1147 | #endif | |
1148 | ||
1149 | if (im->loaded) { | |
1150 | im->loaded = 0; | |
1151 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1152 | } | |
1153 | ||
1154 | #ifdef CONFIG_IP_MULTICAST | |
1155 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1156 | return; | |
1157 | ||
1158 | reporter = im->reporter; | |
1159 | igmp_stop_timer(im); | |
1160 | ||
1161 | if (!in_dev->dead) { | |
1162 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1163 | return; |
1da177e4 LT |
1164 | if (IGMP_V2_SEEN(in_dev)) { |
1165 | if (reporter) | |
1166 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1167 | return; |
1da177e4 LT |
1168 | } |
1169 | /* IGMPv3 */ | |
1170 | igmpv3_add_delrec(in_dev, im); | |
1171 | ||
1172 | igmp_ifc_event(in_dev); | |
1173 | } | |
1da177e4 | 1174 | #endif |
1da177e4 LT |
1175 | } |
1176 | ||
1177 | static void igmp_group_added(struct ip_mc_list *im) | |
1178 | { | |
1179 | struct in_device *in_dev = im->interface; | |
1180 | ||
1181 | if (im->loaded == 0) { | |
1182 | im->loaded = 1; | |
1183 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1184 | } | |
1185 | ||
1186 | #ifdef CONFIG_IP_MULTICAST | |
1187 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1188 | return; | |
1189 | ||
1190 | if (in_dev->dead) | |
1191 | return; | |
1192 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1193 | spin_lock_bh(&im->lock); | |
1194 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1195 | spin_unlock_bh(&im->lock); | |
1196 | return; | |
1197 | } | |
1198 | /* else, v3 */ | |
1199 | ||
1200 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1201 | IGMP_Unsolicited_Report_Count; | |
1202 | igmp_ifc_event(in_dev); | |
1203 | #endif | |
1204 | } | |
1205 | ||
1206 | ||
1207 | /* | |
1208 | * Multicast list managers | |
1209 | */ | |
1210 | ||
1211 | ||
1212 | /* | |
1213 | * A socket has joined a multicast group on device dev. | |
1214 | */ | |
1215 | ||
8f935bbd | 1216 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1217 | { |
1218 | struct ip_mc_list *im; | |
1219 | ||
1220 | ASSERT_RTNL(); | |
1221 | ||
1d7138de | 1222 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1223 | if (im->multiaddr == addr) { |
1224 | im->users++; | |
1225 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1226 | goto out; | |
1227 | } | |
1228 | } | |
1229 | ||
1d7138de | 1230 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1231 | if (!im) |
1232 | goto out; | |
1233 | ||
a7e9ff73 JK |
1234 | im->users = 1; |
1235 | im->interface = in_dev; | |
1da177e4 | 1236 | in_dev_hold(in_dev); |
a7e9ff73 | 1237 | im->multiaddr = addr; |
1da177e4 LT |
1238 | /* initial mode is (EX, empty) */ |
1239 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1240 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1241 | atomic_set(&im->refcnt, 1); |
1242 | spin_lock_init(&im->lock); | |
1243 | #ifdef CONFIG_IP_MULTICAST | |
b24b8a24 | 1244 | setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); |
1da177e4 | 1245 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; |
1da177e4 | 1246 | #endif |
1d7138de ED |
1247 | |
1248 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1249 | in_dev->mc_count++; |
a9b3cd7f | 1250 | RCU_INIT_POINTER(in_dev->mc_list, im); |
1d7138de | 1251 | |
1da177e4 LT |
1252 | #ifdef CONFIG_IP_MULTICAST |
1253 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1254 | #endif | |
1255 | igmp_group_added(im); | |
1256 | if (!in_dev->dead) | |
1257 | ip_rt_multicast_event(in_dev); | |
1258 | out: | |
1259 | return; | |
1260 | } | |
4bc2f18b | 1261 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1262 | |
a816c7c7 JV |
1263 | /* |
1264 | * Resend IGMP JOIN report; used for bonding. | |
866f3b25 | 1265 | * Called with rcu_read_lock() |
a816c7c7 | 1266 | */ |
866f3b25 | 1267 | void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1268 | { |
08882669 | 1269 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1270 | struct ip_mc_list *im; |
1271 | int type; | |
a816c7c7 | 1272 | |
866f3b25 ED |
1273 | for_each_pmc_rcu(in_dev, im) { |
1274 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1275 | continue; | |
a816c7c7 | 1276 | |
866f3b25 ED |
1277 | /* a failover is happening and switches |
1278 | * must be notified immediately | |
1279 | */ | |
1280 | if (IGMP_V1_SEEN(in_dev)) | |
1281 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1282 | else if (IGMP_V2_SEEN(in_dev)) | |
1283 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1284 | else | |
1285 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1286 | igmp_send_report(in_dev, im, type); | |
1287 | } | |
a816c7c7 JV |
1288 | #endif |
1289 | } | |
866f3b25 | 1290 | EXPORT_SYMBOL(ip_mc_rejoin_groups); |
a816c7c7 | 1291 | |
1da177e4 LT |
1292 | /* |
1293 | * A socket has left a multicast group on device dev | |
1294 | */ | |
1295 | ||
8f935bbd | 1296 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1297 | { |
1d7138de ED |
1298 | struct ip_mc_list *i; |
1299 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1300 | |
1da177e4 | 1301 | ASSERT_RTNL(); |
e905a9ed | 1302 | |
1d7138de ED |
1303 | for (ip = &in_dev->mc_list; |
1304 | (i = rtnl_dereference(*ip)) != NULL; | |
1305 | ip = &i->next_rcu) { | |
a7e9ff73 | 1306 | if (i->multiaddr == addr) { |
1da177e4 | 1307 | if (--i->users == 0) { |
1d7138de | 1308 | *ip = i->next_rcu; |
b8bae41e | 1309 | in_dev->mc_count--; |
1da177e4 | 1310 | igmp_group_dropped(i); |
24cf3af3 | 1311 | ip_mc_clear_src(i); |
1da177e4 LT |
1312 | |
1313 | if (!in_dev->dead) | |
1314 | ip_rt_multicast_event(in_dev); | |
1315 | ||
1316 | ip_ma_put(i); | |
1317 | return; | |
1318 | } | |
1319 | break; | |
1320 | } | |
1321 | } | |
1322 | } | |
4bc2f18b | 1323 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1324 | |
75c78500 MS |
1325 | /* Device changing type */ |
1326 | ||
1327 | void ip_mc_unmap(struct in_device *in_dev) | |
1328 | { | |
1d7138de | 1329 | struct ip_mc_list *pmc; |
75c78500 MS |
1330 | |
1331 | ASSERT_RTNL(); | |
1332 | ||
1d7138de ED |
1333 | for_each_pmc_rtnl(in_dev, pmc) |
1334 | igmp_group_dropped(pmc); | |
75c78500 MS |
1335 | } |
1336 | ||
1337 | void ip_mc_remap(struct in_device *in_dev) | |
1338 | { | |
1d7138de | 1339 | struct ip_mc_list *pmc; |
75c78500 MS |
1340 | |
1341 | ASSERT_RTNL(); | |
1342 | ||
1d7138de ED |
1343 | for_each_pmc_rtnl(in_dev, pmc) |
1344 | igmp_group_added(pmc); | |
75c78500 MS |
1345 | } |
1346 | ||
1da177e4 LT |
1347 | /* Device going down */ |
1348 | ||
1349 | void ip_mc_down(struct in_device *in_dev) | |
1350 | { | |
1d7138de | 1351 | struct ip_mc_list *pmc; |
1da177e4 LT |
1352 | |
1353 | ASSERT_RTNL(); | |
1354 | ||
1d7138de ED |
1355 | for_each_pmc_rtnl(in_dev, pmc) |
1356 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1357 | |
1358 | #ifdef CONFIG_IP_MULTICAST | |
1359 | in_dev->mr_ifc_count = 0; | |
1360 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1361 | __in_dev_put(in_dev); | |
1362 | in_dev->mr_gq_running = 0; | |
1363 | if (del_timer(&in_dev->mr_gq_timer)) | |
1364 | __in_dev_put(in_dev); | |
1365 | igmpv3_clear_delrec(in_dev); | |
1366 | #endif | |
1367 | ||
1368 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1369 | } | |
1370 | ||
1371 | void ip_mc_init_dev(struct in_device *in_dev) | |
1372 | { | |
1373 | ASSERT_RTNL(); | |
1374 | ||
1375 | in_dev->mc_tomb = NULL; | |
1376 | #ifdef CONFIG_IP_MULTICAST | |
1377 | in_dev->mr_gq_running = 0; | |
b24b8a24 PE |
1378 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1379 | (unsigned long)in_dev); | |
1da177e4 | 1380 | in_dev->mr_ifc_count = 0; |
b8bae41e | 1381 | in_dev->mc_count = 0; |
b24b8a24 PE |
1382 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1383 | (unsigned long)in_dev); | |
1da177e4 LT |
1384 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; |
1385 | #endif | |
1386 | ||
1da177e4 LT |
1387 | spin_lock_init(&in_dev->mc_tomb_lock); |
1388 | } | |
1389 | ||
1390 | /* Device going up */ | |
1391 | ||
1392 | void ip_mc_up(struct in_device *in_dev) | |
1393 | { | |
1d7138de | 1394 | struct ip_mc_list *pmc; |
1da177e4 LT |
1395 | |
1396 | ASSERT_RTNL(); | |
1397 | ||
1398 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1399 | ||
1d7138de ED |
1400 | for_each_pmc_rtnl(in_dev, pmc) |
1401 | igmp_group_added(pmc); | |
1da177e4 LT |
1402 | } |
1403 | ||
1404 | /* | |
1405 | * Device is about to be destroyed: clean up. | |
1406 | */ | |
1407 | ||
1408 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1409 | { | |
1410 | struct ip_mc_list *i; | |
1411 | ||
1412 | ASSERT_RTNL(); | |
1413 | ||
1414 | /* Deactivate timers */ | |
1415 | ip_mc_down(in_dev); | |
1416 | ||
1d7138de ED |
1417 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1418 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1419 | in_dev->mc_count--; |
1d7138de | 1420 | |
24cf3af3 VF |
1421 | /* We've dropped the groups in ip_mc_down already */ |
1422 | ip_mc_clear_src(i); | |
1da177e4 | 1423 | ip_ma_put(i); |
1da177e4 | 1424 | } |
1da177e4 LT |
1425 | } |
1426 | ||
9e917dca | 1427 | /* RTNL is locked */ |
877acedc | 1428 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1429 | { |
1da177e4 LT |
1430 | struct net_device *dev = NULL; |
1431 | struct in_device *idev = NULL; | |
1432 | ||
1433 | if (imr->imr_ifindex) { | |
877acedc | 1434 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1435 | return idev; |
1436 | } | |
1437 | if (imr->imr_address.s_addr) { | |
9e917dca | 1438 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1439 | if (!dev) |
1440 | return NULL; | |
1da177e4 LT |
1441 | } |
1442 | ||
b23dd4fe | 1443 | if (!dev) { |
78fbfd8a DM |
1444 | struct rtable *rt = ip_route_output(net, |
1445 | imr->imr_multiaddr.s_addr, | |
1446 | 0, 0, 0); | |
b23dd4fe DM |
1447 | if (!IS_ERR(rt)) { |
1448 | dev = rt->dst.dev; | |
1449 | ip_rt_put(rt); | |
1450 | } | |
1da177e4 LT |
1451 | } |
1452 | if (dev) { | |
1453 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1454 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1455 | } |
1456 | return idev; | |
1457 | } | |
1458 | ||
1459 | /* | |
1460 | * Join a socket to a group | |
1461 | */ | |
ab32ea5d BH |
1462 | int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; |
1463 | int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; | |
1da177e4 LT |
1464 | |
1465 | ||
1466 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1467 | __be32 *psfsrc) |
1da177e4 LT |
1468 | { |
1469 | struct ip_sf_list *psf, *psf_prev; | |
1470 | int rv = 0; | |
1471 | ||
1472 | psf_prev = NULL; | |
1473 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1474 | if (psf->sf_inaddr == *psfsrc) | |
1475 | break; | |
1476 | psf_prev = psf; | |
1477 | } | |
1478 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1479 | /* source filter not found, or count wrong => bug */ | |
1480 | return -ESRCH; | |
1481 | } | |
1482 | psf->sf_count[sfmode]--; | |
1483 | if (psf->sf_count[sfmode] == 0) { | |
1484 | ip_rt_multicast_event(pmc->interface); | |
1485 | } | |
1486 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1487 | #ifdef CONFIG_IP_MULTICAST | |
1488 | struct in_device *in_dev = pmc->interface; | |
1489 | #endif | |
1490 | ||
1491 | /* no more filters for this source */ | |
1492 | if (psf_prev) | |
1493 | psf_prev->sf_next = psf->sf_next; | |
1494 | else | |
1495 | pmc->sources = psf->sf_next; | |
1496 | #ifdef CONFIG_IP_MULTICAST | |
1497 | if (psf->sf_oldin && | |
1498 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
e905a9ed | 1499 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1500 | IGMP_Unsolicited_Report_Count; |
1501 | psf->sf_next = pmc->tomb; | |
1502 | pmc->tomb = psf; | |
1503 | rv = 1; | |
1504 | } else | |
1505 | #endif | |
1506 | kfree(psf); | |
1507 | } | |
1508 | return rv; | |
1509 | } | |
1510 | ||
1511 | #ifndef CONFIG_IP_MULTICAST | |
1512 | #define igmp_ifc_event(x) do { } while (0) | |
1513 | #endif | |
1514 | ||
8f935bbd AV |
1515 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1516 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1517 | { |
1518 | struct ip_mc_list *pmc; | |
1519 | int changerec = 0; | |
1520 | int i, err; | |
1521 | ||
1522 | if (!in_dev) | |
1523 | return -ENODEV; | |
1d7138de ED |
1524 | rcu_read_lock(); |
1525 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1526 | if (*pmca == pmc->multiaddr) |
1527 | break; | |
1528 | } | |
1529 | if (!pmc) { | |
1530 | /* MCA not found?? bug */ | |
1d7138de | 1531 | rcu_read_unlock(); |
1da177e4 LT |
1532 | return -ESRCH; |
1533 | } | |
1534 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1535 | rcu_read_unlock(); |
1da177e4 LT |
1536 | #ifdef CONFIG_IP_MULTICAST |
1537 | sf_markstate(pmc); | |
1538 | #endif | |
1539 | if (!delta) { | |
1540 | err = -EINVAL; | |
1541 | if (!pmc->sfcount[sfmode]) | |
1542 | goto out_unlock; | |
1543 | pmc->sfcount[sfmode]--; | |
1544 | } | |
1545 | err = 0; | |
1546 | for (i=0; i<sfcount; i++) { | |
1547 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1548 | ||
1549 | changerec |= rv > 0; | |
1550 | if (!err && rv < 0) | |
1551 | err = rv; | |
1552 | } | |
1553 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1554 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1555 | pmc->sfcount[MCAST_INCLUDE]) { | |
1556 | #ifdef CONFIG_IP_MULTICAST | |
1557 | struct ip_sf_list *psf; | |
1558 | #endif | |
1559 | ||
1560 | /* filter mode change */ | |
1561 | pmc->sfmode = MCAST_INCLUDE; | |
1562 | #ifdef CONFIG_IP_MULTICAST | |
e905a9ed | 1563 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1564 | IGMP_Unsolicited_Report_Count; |
1565 | in_dev->mr_ifc_count = pmc->crcount; | |
1566 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1567 | psf->sf_crcount = 0; | |
1568 | igmp_ifc_event(pmc->interface); | |
1569 | } else if (sf_setstate(pmc) || changerec) { | |
1570 | igmp_ifc_event(pmc->interface); | |
1571 | #endif | |
1572 | } | |
1573 | out_unlock: | |
1574 | spin_unlock_bh(&pmc->lock); | |
1575 | return err; | |
1576 | } | |
1577 | ||
1578 | /* | |
1579 | * Add multicast single-source filter to the interface list | |
1580 | */ | |
1581 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1582 | __be32 *psfsrc, int delta) |
1da177e4 LT |
1583 | { |
1584 | struct ip_sf_list *psf, *psf_prev; | |
1585 | ||
1586 | psf_prev = NULL; | |
1587 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1588 | if (psf->sf_inaddr == *psfsrc) | |
1589 | break; | |
1590 | psf_prev = psf; | |
1591 | } | |
1592 | if (!psf) { | |
0da974f4 | 1593 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1594 | if (!psf) |
1595 | return -ENOBUFS; | |
1da177e4 LT |
1596 | psf->sf_inaddr = *psfsrc; |
1597 | if (psf_prev) { | |
1598 | psf_prev->sf_next = psf; | |
1599 | } else | |
1600 | pmc->sources = psf; | |
1601 | } | |
1602 | psf->sf_count[sfmode]++; | |
1603 | if (psf->sf_count[sfmode] == 1) { | |
1604 | ip_rt_multicast_event(pmc->interface); | |
1605 | } | |
1606 | return 0; | |
1607 | } | |
1608 | ||
1609 | #ifdef CONFIG_IP_MULTICAST | |
1610 | static void sf_markstate(struct ip_mc_list *pmc) | |
1611 | { | |
1612 | struct ip_sf_list *psf; | |
1613 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1614 | ||
1615 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1616 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1617 | psf->sf_oldin = mca_xcount == | |
1618 | psf->sf_count[MCAST_EXCLUDE] && | |
1619 | !psf->sf_count[MCAST_INCLUDE]; | |
1620 | } else | |
1621 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1622 | } | |
1623 | ||
1624 | static int sf_setstate(struct ip_mc_list *pmc) | |
1625 | { | |
ad12583f | 1626 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1627 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1628 | int qrv = pmc->interface->mr_qrv; | |
1629 | int new_in, rv; | |
1630 | ||
1631 | rv = 0; | |
1632 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1633 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1634 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1635 | !psf->sf_count[MCAST_INCLUDE]; | |
1636 | } else | |
1637 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1638 | if (new_in) { |
1639 | if (!psf->sf_oldin) { | |
76edc605 | 1640 | struct ip_sf_list *prev = NULL; |
ad12583f DS |
1641 | |
1642 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { | |
1643 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1644 | break; | |
1645 | prev = dpsf; | |
1646 | } | |
1647 | if (dpsf) { | |
1648 | if (prev) | |
1649 | prev->sf_next = dpsf->sf_next; | |
1650 | else | |
1651 | pmc->tomb = dpsf->sf_next; | |
1652 | kfree(dpsf); | |
1653 | } | |
1654 | psf->sf_crcount = qrv; | |
1655 | rv++; | |
1656 | } | |
1657 | } else if (psf->sf_oldin) { | |
1658 | ||
1659 | psf->sf_crcount = 0; | |
1660 | /* | |
1661 | * add or update "delete" records if an active filter | |
1662 | * is now inactive | |
1663 | */ | |
1664 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) | |
1665 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1666 | break; | |
1667 | if (!dpsf) { | |
3ed37a6f | 1668 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1669 | if (!dpsf) |
1670 | continue; | |
1671 | *dpsf = *psf; | |
1672 | /* pmc->lock held by callers */ | |
1673 | dpsf->sf_next = pmc->tomb; | |
1674 | pmc->tomb = dpsf; | |
1675 | } | |
1676 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1677 | rv++; |
1678 | } | |
1679 | } | |
1680 | return rv; | |
1681 | } | |
1682 | #endif | |
1683 | ||
1684 | /* | |
1685 | * Add multicast source filter list to the interface list | |
1686 | */ | |
8f935bbd AV |
1687 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1688 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1689 | { |
1690 | struct ip_mc_list *pmc; | |
1691 | int isexclude; | |
1692 | int i, err; | |
1693 | ||
1694 | if (!in_dev) | |
1695 | return -ENODEV; | |
1d7138de ED |
1696 | rcu_read_lock(); |
1697 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1698 | if (*pmca == pmc->multiaddr) |
1699 | break; | |
1700 | } | |
1701 | if (!pmc) { | |
1702 | /* MCA not found?? bug */ | |
1d7138de | 1703 | rcu_read_unlock(); |
1da177e4 LT |
1704 | return -ESRCH; |
1705 | } | |
1706 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1707 | rcu_read_unlock(); |
1da177e4 LT |
1708 | |
1709 | #ifdef CONFIG_IP_MULTICAST | |
1710 | sf_markstate(pmc); | |
1711 | #endif | |
1712 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1713 | if (!delta) | |
1714 | pmc->sfcount[sfmode]++; | |
1715 | err = 0; | |
1716 | for (i=0; i<sfcount; i++) { | |
1717 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); | |
1718 | if (err) | |
1719 | break; | |
1720 | } | |
1721 | if (err) { | |
1722 | int j; | |
1723 | ||
685f94e6 JZ |
1724 | if (!delta) |
1725 | pmc->sfcount[sfmode]--; | |
1da177e4 | 1726 | for (j=0; j<i; j++) |
a1889c0d | 1727 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
1728 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
1729 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 1730 | struct ip_sf_list *psf; |
cfcabdcc | 1731 | in_dev = pmc->interface; |
1da177e4 LT |
1732 | #endif |
1733 | ||
1734 | /* filter mode change */ | |
1735 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1736 | pmc->sfmode = MCAST_EXCLUDE; | |
1737 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1738 | pmc->sfmode = MCAST_INCLUDE; | |
1739 | #ifdef CONFIG_IP_MULTICAST | |
1740 | /* else no filters; keep old mode for reports */ | |
1741 | ||
e905a9ed | 1742 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1743 | IGMP_Unsolicited_Report_Count; |
1744 | in_dev->mr_ifc_count = pmc->crcount; | |
1745 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1746 | psf->sf_crcount = 0; | |
1747 | igmp_ifc_event(in_dev); | |
1748 | } else if (sf_setstate(pmc)) { | |
1749 | igmp_ifc_event(in_dev); | |
1750 | #endif | |
1751 | } | |
1752 | spin_unlock_bh(&pmc->lock); | |
1753 | return err; | |
1754 | } | |
1755 | ||
1756 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1757 | { | |
1758 | struct ip_sf_list *psf, *nextpsf; | |
1759 | ||
1760 | for (psf=pmc->tomb; psf; psf=nextpsf) { | |
1761 | nextpsf = psf->sf_next; | |
1762 | kfree(psf); | |
1763 | } | |
1764 | pmc->tomb = NULL; | |
1765 | for (psf=pmc->sources; psf; psf=nextpsf) { | |
1766 | nextpsf = psf->sf_next; | |
1767 | kfree(psf); | |
1768 | } | |
1769 | pmc->sources = NULL; | |
1770 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1771 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1772 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1773 | } | |
1774 | ||
1775 | ||
1776 | /* | |
1777 | * Join a multicast group | |
1778 | */ | |
1779 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1780 | { | |
1781 | int err; | |
8f935bbd | 1782 | __be32 addr = imr->imr_multiaddr.s_addr; |
a7e9ff73 | 1783 | struct ip_mc_socklist *iml = NULL, *i; |
1da177e4 LT |
1784 | struct in_device *in_dev; |
1785 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 1786 | struct net *net = sock_net(sk); |
ca9b907d | 1787 | int ifindex; |
1da177e4 LT |
1788 | int count = 0; |
1789 | ||
f97c1e0c | 1790 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1791 | return -EINVAL; |
1792 | ||
6756ae4b | 1793 | rtnl_lock(); |
1da177e4 | 1794 | |
877acedc | 1795 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
1796 | |
1797 | if (!in_dev) { | |
1798 | iml = NULL; | |
1799 | err = -ENODEV; | |
1800 | goto done; | |
1801 | } | |
1802 | ||
1da177e4 | 1803 | err = -EADDRINUSE; |
ca9b907d | 1804 | ifindex = imr->imr_ifindex; |
1d7138de | 1805 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
1806 | if (i->multi.imr_multiaddr.s_addr == addr && |
1807 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1808 | goto done; |
1da177e4 LT |
1809 | count++; |
1810 | } | |
1811 | err = -ENOBUFS; | |
ca9b907d DS |
1812 | if (count >= sysctl_igmp_max_memberships) |
1813 | goto done; | |
a7e9ff73 | 1814 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
ca9b907d | 1815 | if (iml == NULL) |
1da177e4 | 1816 | goto done; |
ca9b907d | 1817 | |
1da177e4 | 1818 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 1819 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
1820 | iml->sflist = NULL; |
1821 | iml->sfmode = MCAST_EXCLUDE; | |
a9b3cd7f | 1822 | RCU_INIT_POINTER(inet->mc_list, iml); |
1da177e4 | 1823 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 1824 | err = 0; |
1da177e4 | 1825 | done: |
6756ae4b | 1826 | rtnl_unlock(); |
1da177e4 LT |
1827 | return err; |
1828 | } | |
4bc2f18b | 1829 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
1830 | |
1831 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
1832 | struct in_device *in_dev) | |
1833 | { | |
1d7138de | 1834 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
1835 | int err; |
1836 | ||
c85bb41e | 1837 | if (psf == NULL) { |
1da177e4 LT |
1838 | /* any-source empty exclude case */ |
1839 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1840 | iml->sfmode, 0, NULL, 0); | |
1841 | } | |
1842 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 1843 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 1844 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
1845 | /* decrease mem now to avoid the memleak warning */ |
1846 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 1847 | kfree_rcu(psf, rcu); |
1da177e4 LT |
1848 | return err; |
1849 | } | |
1850 | ||
1851 | /* | |
1852 | * Ask a socket to leave a group. | |
1853 | */ | |
1854 | ||
1855 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1856 | { | |
1857 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
1858 | struct ip_mc_socklist *iml; |
1859 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 1860 | struct in_device *in_dev; |
877acedc | 1861 | struct net *net = sock_net(sk); |
8f935bbd | 1862 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 1863 | u32 ifindex; |
acd6e00b | 1864 | int ret = -EADDRNOTAVAIL; |
1da177e4 LT |
1865 | |
1866 | rtnl_lock(); | |
877acedc | 1867 | in_dev = ip_mc_find_dev(net, imr); |
84b42bae | 1868 | ifindex = imr->imr_ifindex; |
1d7138de ED |
1869 | for (imlp = &inet->mc_list; |
1870 | (iml = rtnl_dereference(*imlp)) != NULL; | |
1871 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
1872 | if (iml->multi.imr_multiaddr.s_addr != group) |
1873 | continue; | |
1874 | if (ifindex) { | |
1875 | if (iml->multi.imr_ifindex != ifindex) | |
1876 | continue; | |
1877 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
1878 | iml->multi.imr_address.s_addr) | |
1879 | continue; | |
1da177e4 | 1880 | |
acd6e00b | 1881 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 1882 | |
1d7138de | 1883 | *imlp = iml->next_rcu; |
acd6e00b DS |
1884 | |
1885 | if (in_dev) | |
84b42bae | 1886 | ip_mc_dec_group(in_dev, group); |
acd6e00b | 1887 | rtnl_unlock(); |
c85bb41e FL |
1888 | /* decrease mem now to avoid the memleak warning */ |
1889 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 1890 | kfree_rcu(iml, rcu); |
acd6e00b | 1891 | return 0; |
1da177e4 | 1892 | } |
acd6e00b DS |
1893 | if (!in_dev) |
1894 | ret = -ENODEV; | |
1da177e4 | 1895 | rtnl_unlock(); |
acd6e00b | 1896 | return ret; |
1da177e4 LT |
1897 | } |
1898 | ||
1899 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1900 | ip_mreq_source *mreqs, int ifindex) | |
1901 | { | |
1902 | int err; | |
1903 | struct ip_mreqn imr; | |
63007727 | 1904 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
1905 | struct ip_mc_socklist *pmc; |
1906 | struct in_device *in_dev = NULL; | |
1907 | struct inet_sock *inet = inet_sk(sk); | |
1908 | struct ip_sf_socklist *psl; | |
877acedc | 1909 | struct net *net = sock_net(sk); |
8cdaaa15 | 1910 | int leavegroup = 0; |
1da177e4 LT |
1911 | int i, j, rv; |
1912 | ||
f97c1e0c | 1913 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1914 | return -EINVAL; |
1915 | ||
6756ae4b | 1916 | rtnl_lock(); |
1da177e4 LT |
1917 | |
1918 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1919 | imr.imr_address.s_addr = mreqs->imr_interface; | |
1920 | imr.imr_ifindex = ifindex; | |
877acedc | 1921 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
1922 | |
1923 | if (!in_dev) { | |
1924 | err = -ENODEV; | |
1925 | goto done; | |
1926 | } | |
1927 | err = -EADDRNOTAVAIL; | |
1928 | ||
1d7138de | 1929 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
1930 | if ((pmc->multi.imr_multiaddr.s_addr == |
1931 | imr.imr_multiaddr.s_addr) && | |
1932 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
1933 | break; |
1934 | } | |
917f2f10 DS |
1935 | if (!pmc) { /* must have a prior join */ |
1936 | err = -EINVAL; | |
1da177e4 | 1937 | goto done; |
917f2f10 | 1938 | } |
1da177e4 LT |
1939 | /* if a source filter was set, must be the same mode as before */ |
1940 | if (pmc->sflist) { | |
917f2f10 DS |
1941 | if (pmc->sfmode != omode) { |
1942 | err = -EINVAL; | |
1da177e4 | 1943 | goto done; |
917f2f10 | 1944 | } |
1da177e4 LT |
1945 | } else if (pmc->sfmode != omode) { |
1946 | /* allow mode switches for empty-set filters */ | |
1947 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 1948 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
1949 | NULL, 0); |
1950 | pmc->sfmode = omode; | |
1951 | } | |
1952 | ||
1d7138de | 1953 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
1954 | if (!add) { |
1955 | if (!psl) | |
917f2f10 | 1956 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 LT |
1957 | rv = !0; |
1958 | for (i=0; i<psl->sl_count; i++) { | |
1959 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 1960 | sizeof(__be32)); |
1da177e4 LT |
1961 | if (rv == 0) |
1962 | break; | |
1963 | } | |
1964 | if (rv) /* source not found */ | |
917f2f10 | 1965 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 1966 | |
8cdaaa15 DS |
1967 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
1968 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
1969 | leavegroup = 1; | |
1970 | goto done; | |
1971 | } | |
1972 | ||
1da177e4 | 1973 | /* update the interface filter */ |
e905a9ed | 1974 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
1975 | &mreqs->imr_sourceaddr, 1); |
1976 | ||
1977 | for (j=i+1; j<psl->sl_count; j++) | |
1978 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
1979 | psl->sl_count--; | |
1980 | err = 0; | |
1981 | goto done; | |
1982 | } | |
1983 | /* else, add a new source to the filter */ | |
1984 | ||
1985 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
1986 | err = -ENOBUFS; | |
1987 | goto done; | |
1988 | } | |
1989 | if (!psl || psl->sl_count == psl->sl_max) { | |
1990 | struct ip_sf_socklist *newpsl; | |
1991 | int count = IP_SFBLOCK; | |
1992 | ||
1993 | if (psl) | |
1994 | count += psl->sl_max; | |
8b3a7005 | 1995 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
1996 | if (!newpsl) { |
1997 | err = -ENOBUFS; | |
1998 | goto done; | |
1999 | } | |
2000 | newpsl->sl_max = count; | |
2001 | newpsl->sl_count = count - IP_SFBLOCK; | |
2002 | if (psl) { | |
2003 | for (i=0; i<psl->sl_count; i++) | |
2004 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
c85bb41e FL |
2005 | /* decrease mem now to avoid the memleak warning */ |
2006 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2007 | kfree_rcu(psl, rcu); |
1da177e4 | 2008 | } |
a9b3cd7f | 2009 | RCU_INIT_POINTER(pmc->sflist, newpsl); |
c85bb41e | 2010 | psl = newpsl; |
1da177e4 LT |
2011 | } |
2012 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
2013 | for (i=0; i<psl->sl_count; i++) { | |
2014 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 2015 | sizeof(__be32)); |
1da177e4 LT |
2016 | if (rv == 0) |
2017 | break; | |
2018 | } | |
2019 | if (rv == 0) /* address already there is an error */ | |
2020 | goto done; | |
2021 | for (j=psl->sl_count-1; j>=i; j--) | |
2022 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
2023 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2024 | psl->sl_count++; | |
2025 | err = 0; | |
2026 | /* update the interface list */ | |
e905a9ed | 2027 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2028 | &mreqs->imr_sourceaddr, 1); |
2029 | done: | |
6756ae4b | 2030 | rtnl_unlock(); |
8cdaaa15 DS |
2031 | if (leavegroup) |
2032 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2033 | return err; |
2034 | } | |
2035 | ||
2036 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2037 | { | |
9951f036 | 2038 | int err = 0; |
1da177e4 | 2039 | struct ip_mreqn imr; |
63007727 | 2040 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2041 | struct ip_mc_socklist *pmc; |
2042 | struct in_device *in_dev; | |
2043 | struct inet_sock *inet = inet_sk(sk); | |
2044 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2045 | struct net *net = sock_net(sk); |
9951f036 | 2046 | int leavegroup = 0; |
1da177e4 | 2047 | |
f97c1e0c | 2048 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2049 | return -EINVAL; |
2050 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2051 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2052 | return -EINVAL; | |
2053 | ||
6756ae4b | 2054 | rtnl_lock(); |
1da177e4 LT |
2055 | |
2056 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2057 | imr.imr_address.s_addr = msf->imsf_interface; | |
2058 | imr.imr_ifindex = ifindex; | |
877acedc | 2059 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2060 | |
2061 | if (!in_dev) { | |
2062 | err = -ENODEV; | |
2063 | goto done; | |
2064 | } | |
1da177e4 | 2065 | |
9951f036 DS |
2066 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2067 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2068 | leavegroup = 1; | |
2069 | goto done; | |
2070 | } | |
2071 | ||
1d7138de | 2072 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2073 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2074 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2075 | break; | |
2076 | } | |
917f2f10 DS |
2077 | if (!pmc) { /* must have a prior join */ |
2078 | err = -EINVAL; | |
1da177e4 | 2079 | goto done; |
917f2f10 | 2080 | } |
1da177e4 | 2081 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2082 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2083 | GFP_KERNEL); | |
1da177e4 LT |
2084 | if (!newpsl) { |
2085 | err = -ENOBUFS; | |
2086 | goto done; | |
2087 | } | |
2088 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2089 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2090 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2091 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2092 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2093 | if (err) { | |
2094 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2095 | goto done; | |
2096 | } | |
8713dbf0 | 2097 | } else { |
1da177e4 | 2098 | newpsl = NULL; |
8713dbf0 YZ |
2099 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2100 | msf->imsf_fmode, 0, NULL, 0); | |
2101 | } | |
1d7138de | 2102 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2103 | if (psl) { |
2104 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2105 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2106 | /* decrease mem now to avoid the memleak warning */ |
2107 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2108 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2109 | } else |
2110 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2111 | 0, NULL, 0); | |
a9b3cd7f | 2112 | RCU_INIT_POINTER(pmc->sflist, newpsl); |
1da177e4 | 2113 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2114 | err = 0; |
1da177e4 | 2115 | done: |
6756ae4b | 2116 | rtnl_unlock(); |
9951f036 DS |
2117 | if (leavegroup) |
2118 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2119 | return err; |
2120 | } | |
2121 | ||
2122 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2123 | struct ip_msfilter __user *optval, int __user *optlen) | |
2124 | { | |
2125 | int err, len, count, copycount; | |
2126 | struct ip_mreqn imr; | |
63007727 | 2127 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2128 | struct ip_mc_socklist *pmc; |
2129 | struct in_device *in_dev; | |
2130 | struct inet_sock *inet = inet_sk(sk); | |
2131 | struct ip_sf_socklist *psl; | |
877acedc | 2132 | struct net *net = sock_net(sk); |
1da177e4 | 2133 | |
f97c1e0c | 2134 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2135 | return -EINVAL; |
2136 | ||
6756ae4b | 2137 | rtnl_lock(); |
1da177e4 LT |
2138 | |
2139 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2140 | imr.imr_address.s_addr = msf->imsf_interface; | |
2141 | imr.imr_ifindex = 0; | |
877acedc | 2142 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2143 | |
2144 | if (!in_dev) { | |
2145 | err = -ENODEV; | |
2146 | goto done; | |
2147 | } | |
2148 | err = -EADDRNOTAVAIL; | |
2149 | ||
1d7138de | 2150 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2151 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2152 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2153 | break; | |
2154 | } | |
2155 | if (!pmc) /* must have a prior join */ | |
2156 | goto done; | |
2157 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2158 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2159 | rtnl_unlock(); |
1da177e4 LT |
2160 | if (!psl) { |
2161 | len = 0; | |
2162 | count = 0; | |
2163 | } else { | |
2164 | count = psl->sl_count; | |
2165 | } | |
2166 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2167 | len = copycount * sizeof(psl->sl_addr[0]); | |
2168 | msf->imsf_numsrc = count; | |
2169 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2170 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2171 | return -EFAULT; | |
2172 | } | |
2173 | if (len && | |
2174 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2175 | return -EFAULT; | |
2176 | return 0; | |
2177 | done: | |
6756ae4b | 2178 | rtnl_unlock(); |
1da177e4 LT |
2179 | return err; |
2180 | } | |
2181 | ||
2182 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2183 | struct group_filter __user *optval, int __user *optlen) | |
2184 | { | |
2185 | int err, i, count, copycount; | |
2186 | struct sockaddr_in *psin; | |
63007727 | 2187 | __be32 addr; |
1da177e4 LT |
2188 | struct ip_mc_socklist *pmc; |
2189 | struct inet_sock *inet = inet_sk(sk); | |
2190 | struct ip_sf_socklist *psl; | |
2191 | ||
2192 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2193 | if (psin->sin_family != AF_INET) | |
2194 | return -EINVAL; | |
2195 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2196 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2197 | return -EINVAL; |
2198 | ||
6756ae4b | 2199 | rtnl_lock(); |
1da177e4 LT |
2200 | |
2201 | err = -EADDRNOTAVAIL; | |
2202 | ||
1d7138de | 2203 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2204 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2205 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2206 | break; | |
2207 | } | |
2208 | if (!pmc) /* must have a prior join */ | |
2209 | goto done; | |
2210 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2211 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2212 | rtnl_unlock(); |
1da177e4 LT |
2213 | count = psl ? psl->sl_count : 0; |
2214 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2215 | gsf->gf_numsrc = count; | |
2216 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2217 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2218 | return -EFAULT; | |
2219 | } | |
2220 | for (i=0; i<copycount; i++) { | |
1da177e4 LT |
2221 | struct sockaddr_storage ss; |
2222 | ||
2223 | psin = (struct sockaddr_in *)&ss; | |
2224 | memset(&ss, 0, sizeof(ss)); | |
2225 | psin->sin_family = AF_INET; | |
2226 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2227 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2228 | return -EFAULT; | |
2229 | } | |
2230 | return 0; | |
2231 | done: | |
6756ae4b | 2232 | rtnl_unlock(); |
1da177e4 LT |
2233 | return err; |
2234 | } | |
2235 | ||
2236 | /* | |
2237 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2238 | */ | |
c0cda068 | 2239 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2240 | { |
2241 | struct inet_sock *inet = inet_sk(sk); | |
2242 | struct ip_mc_socklist *pmc; | |
2243 | struct ip_sf_socklist *psl; | |
2244 | int i; | |
c85bb41e | 2245 | int ret; |
1da177e4 | 2246 | |
c85bb41e | 2247 | ret = 1; |
f97c1e0c | 2248 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2249 | goto out; |
1da177e4 | 2250 | |
c85bb41e | 2251 | rcu_read_lock(); |
1d7138de | 2252 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2253 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2254 | pmc->multi.imr_ifindex == dif) | |
2255 | break; | |
2256 | } | |
c85bb41e | 2257 | ret = inet->mc_all; |
1da177e4 | 2258 | if (!pmc) |
c85bb41e | 2259 | goto unlock; |
1d7138de | 2260 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2261 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2262 | if (!psl) |
c85bb41e | 2263 | goto unlock; |
1da177e4 LT |
2264 | |
2265 | for (i=0; i<psl->sl_count; i++) { | |
2266 | if (psl->sl_addr[i] == rmt_addr) | |
2267 | break; | |
2268 | } | |
c85bb41e | 2269 | ret = 0; |
1da177e4 | 2270 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2271 | goto unlock; |
1da177e4 | 2272 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2273 | goto unlock; |
2274 | ret = 1; | |
2275 | unlock: | |
2276 | rcu_read_unlock(); | |
2277 | out: | |
2278 | return ret; | |
1da177e4 LT |
2279 | } |
2280 | ||
2281 | /* | |
2282 | * A socket is closing. | |
2283 | */ | |
2284 | ||
2285 | void ip_mc_drop_socket(struct sock *sk) | |
2286 | { | |
2287 | struct inet_sock *inet = inet_sk(sk); | |
2288 | struct ip_mc_socklist *iml; | |
877acedc | 2289 | struct net *net = sock_net(sk); |
1da177e4 LT |
2290 | |
2291 | if (inet->mc_list == NULL) | |
2292 | return; | |
2293 | ||
2294 | rtnl_lock(); | |
1d7138de | 2295 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2296 | struct in_device *in_dev; |
1da177e4 | 2297 | |
1d7138de | 2298 | inet->mc_list = iml->next_rcu; |
877acedc | 2299 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2300 | (void) ip_mc_leave_src(sk, iml, in_dev); |
18943d29 | 2301 | if (in_dev != NULL) |
1da177e4 | 2302 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2303 | /* decrease mem now to avoid the memleak warning */ |
2304 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2305 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2306 | } |
2307 | rtnl_unlock(); | |
2308 | } | |
2309 | ||
dbdd9a52 DM |
2310 | /* called with rcu_read_lock() */ |
2311 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) | |
1da177e4 LT |
2312 | { |
2313 | struct ip_mc_list *im; | |
2314 | struct ip_sf_list *psf; | |
2315 | int rv = 0; | |
2316 | ||
1d7138de | 2317 | for_each_pmc_rcu(in_dev, im) { |
1da177e4 LT |
2318 | if (im->multiaddr == mc_addr) |
2319 | break; | |
2320 | } | |
2321 | if (im && proto == IPPROTO_IGMP) { | |
2322 | rv = 1; | |
2323 | } else if (im) { | |
2324 | if (src_addr) { | |
2325 | for (psf=im->sources; psf; psf=psf->sf_next) { | |
2326 | if (psf->sf_inaddr == src_addr) | |
2327 | break; | |
2328 | } | |
2329 | if (psf) | |
2330 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2331 | psf->sf_count[MCAST_EXCLUDE] != | |
2332 | im->sfcount[MCAST_EXCLUDE]; | |
2333 | else | |
2334 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2335 | } else | |
2336 | rv = 1; /* unspecified source; tentatively allow */ | |
2337 | } | |
1da177e4 LT |
2338 | return rv; |
2339 | } | |
2340 | ||
2341 | #if defined(CONFIG_PROC_FS) | |
2342 | struct igmp_mc_iter_state { | |
7091e728 | 2343 | struct seq_net_private p; |
1da177e4 LT |
2344 | struct net_device *dev; |
2345 | struct in_device *in_dev; | |
2346 | }; | |
2347 | ||
2348 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2349 | ||
2350 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2351 | { | |
7091e728 | 2352 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2353 | struct ip_mc_list *im = NULL; |
2354 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2355 | ||
7562f876 | 2356 | state->in_dev = NULL; |
61fbab77 | 2357 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2358 | struct in_device *in_dev; |
6baff150 ED |
2359 | |
2360 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2361 | if (!in_dev) |
2362 | continue; | |
1d7138de | 2363 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2364 | if (im) { |
2365 | state->in_dev = in_dev; | |
2366 | break; | |
2367 | } | |
1da177e4 LT |
2368 | } |
2369 | return im; | |
2370 | } | |
2371 | ||
2372 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2373 | { | |
2374 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2375 | |
1d7138de ED |
2376 | im = rcu_dereference(im->next_rcu); |
2377 | while (!im) { | |
6baff150 | 2378 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2379 | if (!state->dev) { |
2380 | state->in_dev = NULL; | |
2381 | break; | |
2382 | } | |
6baff150 | 2383 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2384 | if (!state->in_dev) |
2385 | continue; | |
1d7138de | 2386 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2387 | } |
2388 | return im; | |
2389 | } | |
2390 | ||
2391 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2392 | { | |
2393 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2394 | if (im) | |
2395 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2396 | --pos; | |
2397 | return pos ? NULL : im; | |
2398 | } | |
2399 | ||
2400 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2401 | __acquires(rcu) |
1da177e4 | 2402 | { |
61fbab77 | 2403 | rcu_read_lock(); |
1da177e4 LT |
2404 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2405 | } | |
2406 | ||
2407 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2408 | { | |
2409 | struct ip_mc_list *im; | |
2410 | if (v == SEQ_START_TOKEN) | |
2411 | im = igmp_mc_get_first(seq); | |
2412 | else | |
2413 | im = igmp_mc_get_next(seq, v); | |
2414 | ++*pos; | |
2415 | return im; | |
2416 | } | |
2417 | ||
2418 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2419 | __releases(rcu) |
1da177e4 LT |
2420 | { |
2421 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2422 | |
2423 | state->in_dev = NULL; | |
1da177e4 | 2424 | state->dev = NULL; |
61fbab77 | 2425 | rcu_read_unlock(); |
1da177e4 LT |
2426 | } |
2427 | ||
2428 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2429 | { | |
2430 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2431 | seq_puts(seq, |
1da177e4 LT |
2432 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2433 | else { | |
2434 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2435 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2436 | char *querier; | |
2437 | #ifdef CONFIG_IP_MULTICAST | |
2438 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2439 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2440 | "V3"; | |
2441 | #else | |
2442 | querier = "NONE"; | |
2443 | #endif | |
2444 | ||
1d7138de | 2445 | if (rcu_dereference(state->in_dev->mc_list) == im) { |
1da177e4 | 2446 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2447 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2448 | } |
2449 | ||
2450 | seq_printf(seq, | |
338fcf98 | 2451 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 LT |
2452 | im->multiaddr, im->users, |
2453 | im->tm_running, im->tm_running ? | |
2454 | jiffies_to_clock_t(im->timer.expires-jiffies) : 0, | |
2455 | im->reporter); | |
2456 | } | |
2457 | return 0; | |
2458 | } | |
2459 | ||
f690808e | 2460 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2461 | .start = igmp_mc_seq_start, |
2462 | .next = igmp_mc_seq_next, | |
2463 | .stop = igmp_mc_seq_stop, | |
2464 | .show = igmp_mc_seq_show, | |
2465 | }; | |
2466 | ||
2467 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2468 | { | |
7091e728 | 2469 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2470 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2471 | } |
2472 | ||
9a32144e | 2473 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2474 | .owner = THIS_MODULE, |
2475 | .open = igmp_mc_seq_open, | |
2476 | .read = seq_read, | |
2477 | .llseek = seq_lseek, | |
7091e728 | 2478 | .release = seq_release_net, |
1da177e4 LT |
2479 | }; |
2480 | ||
2481 | struct igmp_mcf_iter_state { | |
7091e728 | 2482 | struct seq_net_private p; |
1da177e4 LT |
2483 | struct net_device *dev; |
2484 | struct in_device *idev; | |
2485 | struct ip_mc_list *im; | |
2486 | }; | |
2487 | ||
2488 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2489 | ||
2490 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2491 | { | |
7091e728 | 2492 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2493 | struct ip_sf_list *psf = NULL; |
2494 | struct ip_mc_list *im = NULL; | |
2495 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2496 | ||
7562f876 PE |
2497 | state->idev = NULL; |
2498 | state->im = NULL; | |
61fbab77 | 2499 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2500 | struct in_device *idev; |
6baff150 | 2501 | idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2502 | if (unlikely(idev == NULL)) |
2503 | continue; | |
1d7138de | 2504 | im = rcu_dereference(idev->mc_list); |
1da177e4 LT |
2505 | if (likely(im != NULL)) { |
2506 | spin_lock_bh(&im->lock); | |
2507 | psf = im->sources; | |
2508 | if (likely(psf != NULL)) { | |
2509 | state->im = im; | |
2510 | state->idev = idev; | |
2511 | break; | |
2512 | } | |
2513 | spin_unlock_bh(&im->lock); | |
2514 | } | |
1da177e4 LT |
2515 | } |
2516 | return psf; | |
2517 | } | |
2518 | ||
2519 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2520 | { | |
2521 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2522 | ||
2523 | psf = psf->sf_next; | |
2524 | while (!psf) { | |
2525 | spin_unlock_bh(&state->im->lock); | |
2526 | state->im = state->im->next; | |
2527 | while (!state->im) { | |
6baff150 | 2528 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2529 | if (!state->dev) { |
2530 | state->idev = NULL; | |
2531 | goto out; | |
2532 | } | |
6baff150 | 2533 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2534 | if (!state->idev) |
2535 | continue; | |
1d7138de | 2536 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2537 | } |
2538 | if (!state->im) | |
2539 | break; | |
2540 | spin_lock_bh(&state->im->lock); | |
2541 | psf = state->im->sources; | |
2542 | } | |
2543 | out: | |
2544 | return psf; | |
2545 | } | |
2546 | ||
2547 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2548 | { | |
2549 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2550 | if (psf) | |
2551 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2552 | --pos; | |
2553 | return pos ? NULL : psf; | |
2554 | } | |
2555 | ||
2556 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2557 | __acquires(rcu) |
1da177e4 | 2558 | { |
61fbab77 | 2559 | rcu_read_lock(); |
1da177e4 LT |
2560 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2561 | } | |
2562 | ||
2563 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2564 | { | |
2565 | struct ip_sf_list *psf; | |
2566 | if (v == SEQ_START_TOKEN) | |
2567 | psf = igmp_mcf_get_first(seq); | |
2568 | else | |
2569 | psf = igmp_mcf_get_next(seq, v); | |
2570 | ++*pos; | |
2571 | return psf; | |
2572 | } | |
2573 | ||
2574 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2575 | __releases(rcu) |
1da177e4 LT |
2576 | { |
2577 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2578 | if (likely(state->im != NULL)) { | |
2579 | spin_unlock_bh(&state->im->lock); | |
2580 | state->im = NULL; | |
2581 | } | |
1d7138de | 2582 | state->idev = NULL; |
1da177e4 | 2583 | state->dev = NULL; |
61fbab77 | 2584 | rcu_read_unlock(); |
1da177e4 LT |
2585 | } |
2586 | ||
2587 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2588 | { | |
2589 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2590 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2591 | ||
2592 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2593 | seq_printf(seq, |
1da177e4 LT |
2594 | "%3s %6s " |
2595 | "%10s %10s %6s %6s\n", "Idx", | |
2596 | "Device", "MCA", | |
2597 | "SRC", "INC", "EXC"); | |
2598 | } else { | |
2599 | seq_printf(seq, | |
2600 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2601 | "0x%08x %6lu %6lu\n", |
2602 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2603 | ntohl(state->im->multiaddr), |
2604 | ntohl(psf->sf_inaddr), | |
2605 | psf->sf_count[MCAST_INCLUDE], | |
2606 | psf->sf_count[MCAST_EXCLUDE]); | |
2607 | } | |
2608 | return 0; | |
2609 | } | |
2610 | ||
f690808e | 2611 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2612 | .start = igmp_mcf_seq_start, |
2613 | .next = igmp_mcf_seq_next, | |
2614 | .stop = igmp_mcf_seq_stop, | |
2615 | .show = igmp_mcf_seq_show, | |
2616 | }; | |
2617 | ||
2618 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2619 | { | |
7091e728 | 2620 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2621 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2622 | } |
2623 | ||
9a32144e | 2624 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2625 | .owner = THIS_MODULE, |
2626 | .open = igmp_mcf_seq_open, | |
2627 | .read = seq_read, | |
2628 | .llseek = seq_lseek, | |
7091e728 | 2629 | .release = seq_release_net, |
1da177e4 LT |
2630 | }; |
2631 | ||
2c8c1e72 | 2632 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2633 | { |
7091e728 AD |
2634 | struct proc_dir_entry *pde; |
2635 | ||
2636 | pde = proc_net_fops_create(net, "igmp", S_IRUGO, &igmp_mc_seq_fops); | |
2637 | if (!pde) | |
2638 | goto out_igmp; | |
2639 | pde = proc_net_fops_create(net, "mcfilter", S_IRUGO, &igmp_mcf_seq_fops); | |
2640 | if (!pde) | |
2641 | goto out_mcfilter; | |
1da177e4 | 2642 | return 0; |
7091e728 AD |
2643 | |
2644 | out_mcfilter: | |
2645 | proc_net_remove(net, "igmp"); | |
2646 | out_igmp: | |
2647 | return -ENOMEM; | |
2648 | } | |
2649 | ||
2c8c1e72 | 2650 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 AD |
2651 | { |
2652 | proc_net_remove(net, "mcfilter"); | |
2653 | proc_net_remove(net, "igmp"); | |
2654 | } | |
2655 | ||
2656 | static struct pernet_operations igmp_net_ops = { | |
2657 | .init = igmp_net_init, | |
2658 | .exit = igmp_net_exit, | |
2659 | }; | |
2660 | ||
2661 | int __init igmp_mc_proc_init(void) | |
2662 | { | |
2663 | return register_pernet_subsys(&igmp_net_ops); | |
1da177e4 LT |
2664 | } |
2665 | #endif |