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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
1da177e4 | 75 | #include <asm/uaccess.h> |
1da177e4 LT |
76 | #include <linux/types.h> |
77 | #include <linux/kernel.h> | |
78 | #include <linux/jiffies.h> | |
79 | #include <linux/string.h> | |
80 | #include <linux/socket.h> | |
81 | #include <linux/sockios.h> | |
82 | #include <linux/in.h> | |
83 | #include <linux/inet.h> | |
84 | #include <linux/netdevice.h> | |
85 | #include <linux/skbuff.h> | |
86 | #include <linux/inetdevice.h> | |
87 | #include <linux/igmp.h> | |
88 | #include <linux/if_arp.h> | |
89 | #include <linux/rtnetlink.h> | |
90 | #include <linux/times.h> | |
9d4a0314 | 91 | #include <linux/pkt_sched.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 | } | |
9d4a0314 | 319 | skb->priority = TC_PRIO_CONTROL; |
57e1ab6e | 320 | igmp_skb_size(skb) = size; |
1da177e4 | 321 | |
31e4543d | 322 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
323 | 0, 0, |
324 | IPPROTO_IGMP, 0, dev->ifindex); | |
325 | if (IS_ERR(rt)) { | |
326 | kfree_skb(skb); | |
327 | return NULL; | |
1da177e4 | 328 | } |
1da177e4 | 329 | |
d8d1f30b | 330 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
331 | skb->dev = dev; |
332 | ||
66088243 | 333 | skb_reserve(skb, hlen); |
1da177e4 | 334 | |
7e28ecc2 | 335 | skb_reset_network_header(skb); |
eddc9ec5 | 336 | pip = ip_hdr(skb); |
7e28ecc2 | 337 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
338 | |
339 | pip->version = 4; | |
340 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
341 | pip->tos = 0xc0; | |
342 | pip->frag_off = htons(IP_DF); | |
343 | pip->ttl = 1; | |
492f64ce DM |
344 | pip->daddr = fl4.daddr; |
345 | pip->saddr = fl4.saddr; | |
1da177e4 LT |
346 | pip->protocol = IPPROTO_IGMP; |
347 | pip->tot_len = 0; /* filled in later */ | |
d8d1f30b | 348 | ip_select_ident(pip, &rt->dst, NULL); |
5e73ea1a DB |
349 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
350 | ((u8 *)&pip[1])[1] = 4; | |
351 | ((u8 *)&pip[1])[2] = 0; | |
352 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 353 | |
b0e380b1 | 354 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 355 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 356 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
357 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
358 | pig->resv1 = 0; | |
359 | pig->csum = 0; | |
360 | pig->resv2 = 0; | |
361 | pig->ngrec = 0; | |
362 | return skb; | |
363 | } | |
364 | ||
365 | static int igmpv3_sendpack(struct sk_buff *skb) | |
366 | { | |
d9edf9e2 | 367 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 368 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 369 | |
d9edf9e2 | 370 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 371 | |
c439cb2e | 372 | return ip_local_out(skb); |
1da177e4 LT |
373 | } |
374 | ||
375 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
376 | { | |
a7e9ff73 | 377 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
378 | } |
379 | ||
380 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
381 | int type, struct igmpv3_grec **ppgr) | |
382 | { | |
383 | struct net_device *dev = pmc->interface->dev; | |
384 | struct igmpv3_report *pih; | |
385 | struct igmpv3_grec *pgr; | |
386 | ||
387 | if (!skb) | |
388 | skb = igmpv3_newpack(dev, dev->mtu); | |
389 | if (!skb) | |
390 | return NULL; | |
391 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
392 | pgr->grec_type = type; | |
393 | pgr->grec_auxwords = 0; | |
394 | pgr->grec_nsrcs = 0; | |
395 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 396 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
397 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
398 | *ppgr = pgr; | |
399 | return skb; | |
400 | } | |
401 | ||
57e1ab6e | 402 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? igmp_skb_size(skb) - (skb)->len : \ |
1da177e4 LT |
403 | skb_tailroom(skb)) : 0) |
404 | ||
405 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
406 | int type, int gdeleted, int sdeleted) | |
407 | { | |
408 | struct net_device *dev = pmc->interface->dev; | |
409 | struct igmpv3_report *pih; | |
410 | struct igmpv3_grec *pgr = NULL; | |
411 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 412 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
413 | |
414 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
415 | return skb; | |
416 | ||
417 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
418 | type == IGMPV3_MODE_IS_EXCLUDE; | |
419 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
420 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
421 | ||
ad12583f DS |
422 | stotal = scount = 0; |
423 | ||
1da177e4 LT |
424 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
425 | ||
ad12583f DS |
426 | if (!*psf_list) |
427 | goto empty_source; | |
428 | ||
d9edf9e2 | 429 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
430 | |
431 | /* EX and TO_EX get a fresh packet, if needed */ | |
432 | if (truncate) { | |
433 | if (pih && pih->ngrec && | |
434 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
435 | if (skb) | |
436 | igmpv3_sendpack(skb); | |
437 | skb = igmpv3_newpack(dev, dev->mtu); | |
438 | } | |
439 | } | |
440 | first = 1; | |
1da177e4 LT |
441 | psf_prev = NULL; |
442 | for (psf=*psf_list; psf; psf=psf_next) { | |
ea4d9e72 | 443 | __be32 *psrc; |
1da177e4 LT |
444 | |
445 | psf_next = psf->sf_next; | |
446 | ||
447 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
448 | psf_prev = psf; | |
449 | continue; | |
450 | } | |
451 | ||
452 | /* clear marks on query responses */ | |
453 | if (isquery) | |
454 | psf->sf_gsresp = 0; | |
455 | ||
63007727 | 456 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
457 | first*sizeof(struct igmpv3_grec)) { |
458 | if (truncate && !first) | |
459 | break; /* truncate these */ | |
460 | if (pgr) | |
461 | pgr->grec_nsrcs = htons(scount); | |
462 | if (skb) | |
463 | igmpv3_sendpack(skb); | |
464 | skb = igmpv3_newpack(dev, dev->mtu); | |
465 | first = 1; | |
466 | scount = 0; | |
467 | } | |
468 | if (first) { | |
469 | skb = add_grhead(skb, pmc, type, &pgr); | |
470 | first = 0; | |
471 | } | |
cc63f70b AD |
472 | if (!skb) |
473 | return NULL; | |
63007727 | 474 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 475 | *psrc = psf->sf_inaddr; |
ad12583f | 476 | scount++; stotal++; |
1da177e4 LT |
477 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
478 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
479 | psf->sf_crcount--; | |
480 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
481 | if (psf_prev) | |
482 | psf_prev->sf_next = psf->sf_next; | |
483 | else | |
484 | *psf_list = psf->sf_next; | |
485 | kfree(psf); | |
486 | continue; | |
487 | } | |
488 | } | |
489 | psf_prev = psf; | |
490 | } | |
ad12583f DS |
491 | |
492 | empty_source: | |
493 | if (!stotal) { | |
494 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
495 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
496 | return skb; | |
497 | if (pmc->crcount || isquery) { | |
498 | /* make sure we have room for group header */ | |
499 | if (skb && AVAILABLE(skb)<sizeof(struct igmpv3_grec)) { | |
500 | igmpv3_sendpack(skb); | |
501 | skb = NULL; /* add_grhead will get a new one */ | |
502 | } | |
503 | skb = add_grhead(skb, pmc, type, &pgr); | |
504 | } | |
505 | } | |
1da177e4 LT |
506 | if (pgr) |
507 | pgr->grec_nsrcs = htons(scount); | |
508 | ||
509 | if (isquery) | |
510 | pmc->gsquery = 0; /* clear query state on report */ | |
511 | return skb; | |
512 | } | |
513 | ||
514 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
515 | { | |
516 | struct sk_buff *skb = NULL; | |
517 | int type; | |
518 | ||
519 | if (!pmc) { | |
1d7138de ED |
520 | rcu_read_lock(); |
521 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
522 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
523 | continue; | |
524 | spin_lock_bh(&pmc->lock); | |
525 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
526 | type = IGMPV3_MODE_IS_EXCLUDE; | |
527 | else | |
528 | type = IGMPV3_MODE_IS_INCLUDE; | |
529 | skb = add_grec(skb, pmc, type, 0, 0); | |
530 | spin_unlock_bh(&pmc->lock); | |
531 | } | |
1d7138de | 532 | rcu_read_unlock(); |
1da177e4 LT |
533 | } else { |
534 | spin_lock_bh(&pmc->lock); | |
535 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
536 | type = IGMPV3_MODE_IS_EXCLUDE; | |
537 | else | |
538 | type = IGMPV3_MODE_IS_INCLUDE; | |
539 | skb = add_grec(skb, pmc, type, 0, 0); | |
540 | spin_unlock_bh(&pmc->lock); | |
541 | } | |
542 | if (!skb) | |
543 | return 0; | |
544 | return igmpv3_sendpack(skb); | |
545 | } | |
546 | ||
547 | /* | |
548 | * remove zero-count source records from a source filter list | |
549 | */ | |
550 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
551 | { | |
552 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
553 | ||
554 | psf_prev = NULL; | |
555 | for (psf=*ppsf; psf; psf = psf_next) { | |
556 | psf_next = psf->sf_next; | |
557 | if (psf->sf_crcount == 0) { | |
558 | if (psf_prev) | |
559 | psf_prev->sf_next = psf->sf_next; | |
560 | else | |
561 | *ppsf = psf->sf_next; | |
562 | kfree(psf); | |
563 | } else | |
564 | psf_prev = psf; | |
565 | } | |
566 | } | |
567 | ||
568 | static void igmpv3_send_cr(struct in_device *in_dev) | |
569 | { | |
570 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
571 | struct sk_buff *skb = NULL; | |
572 | int type, dtype; | |
573 | ||
1d7138de | 574 | rcu_read_lock(); |
1da177e4 LT |
575 | spin_lock_bh(&in_dev->mc_tomb_lock); |
576 | ||
577 | /* deleted MCA's */ | |
578 | pmc_prev = NULL; | |
579 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc_next) { | |
580 | pmc_next = pmc->next; | |
581 | if (pmc->sfmode == MCAST_INCLUDE) { | |
582 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
583 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
584 | skb = add_grec(skb, pmc, type, 1, 0); | |
585 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
586 | } | |
587 | if (pmc->crcount) { | |
1da177e4 LT |
588 | if (pmc->sfmode == MCAST_EXCLUDE) { |
589 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
590 | skb = add_grec(skb, pmc, type, 1, 0); | |
591 | } | |
ad12583f | 592 | pmc->crcount--; |
1da177e4 LT |
593 | if (pmc->crcount == 0) { |
594 | igmpv3_clear_zeros(&pmc->tomb); | |
595 | igmpv3_clear_zeros(&pmc->sources); | |
596 | } | |
597 | } | |
598 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
599 | if (pmc_prev) | |
600 | pmc_prev->next = pmc_next; | |
601 | else | |
602 | in_dev->mc_tomb = pmc_next; | |
603 | in_dev_put(pmc->interface); | |
604 | kfree(pmc); | |
605 | } else | |
606 | pmc_prev = pmc; | |
607 | } | |
608 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
609 | ||
610 | /* change recs */ | |
1d7138de | 611 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
612 | spin_lock_bh(&pmc->lock); |
613 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
614 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
615 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
616 | } else { | |
617 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
618 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
619 | } | |
620 | skb = add_grec(skb, pmc, type, 0, 0); | |
621 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
622 | ||
623 | /* filter mode changes */ | |
624 | if (pmc->crcount) { | |
1da177e4 LT |
625 | if (pmc->sfmode == MCAST_EXCLUDE) |
626 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
627 | else | |
628 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
629 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 630 | pmc->crcount--; |
1da177e4 LT |
631 | } |
632 | spin_unlock_bh(&pmc->lock); | |
633 | } | |
1d7138de | 634 | rcu_read_unlock(); |
1da177e4 LT |
635 | |
636 | if (!skb) | |
637 | return; | |
638 | (void) igmpv3_sendpack(skb); | |
639 | } | |
640 | ||
641 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
642 | int type) | |
643 | { | |
644 | struct sk_buff *skb; | |
645 | struct iphdr *iph; | |
646 | struct igmphdr *ih; | |
647 | struct rtable *rt; | |
648 | struct net_device *dev = in_dev->dev; | |
877acedc | 649 | struct net *net = dev_net(dev); |
63007727 | 650 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 651 | struct flowi4 fl4; |
63007727 | 652 | __be32 dst; |
66088243 | 653 | int hlen, tlen; |
1da177e4 LT |
654 | |
655 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
656 | return igmpv3_send_report(in_dev, pmc); | |
657 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
658 | dst = IGMP_ALL_ROUTER; | |
659 | else | |
660 | dst = group; | |
661 | ||
31e4543d | 662 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
663 | 0, 0, |
664 | IPPROTO_IGMP, 0, dev->ifindex); | |
665 | if (IS_ERR(rt)) | |
666 | return -1; | |
667 | ||
66088243 HX |
668 | hlen = LL_RESERVED_SPACE(dev); |
669 | tlen = dev->needed_tailroom; | |
670 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
1da177e4 LT |
671 | if (skb == NULL) { |
672 | ip_rt_put(rt); | |
673 | return -1; | |
674 | } | |
9d4a0314 | 675 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 676 | |
d8d1f30b | 677 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 678 | |
66088243 | 679 | skb_reserve(skb, hlen); |
1da177e4 | 680 | |
7e28ecc2 | 681 | skb_reset_network_header(skb); |
eddc9ec5 | 682 | iph = ip_hdr(skb); |
7e28ecc2 | 683 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
684 | |
685 | iph->version = 4; | |
686 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
687 | iph->tos = 0xc0; | |
688 | iph->frag_off = htons(IP_DF); | |
689 | iph->ttl = 1; | |
690 | iph->daddr = dst; | |
492f64ce | 691 | iph->saddr = fl4.saddr; |
1da177e4 | 692 | iph->protocol = IPPROTO_IGMP; |
d8d1f30b | 693 | ip_select_ident(iph, &rt->dst, NULL); |
5e73ea1a DB |
694 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
695 | ((u8 *)&iph[1])[1] = 4; | |
696 | ((u8 *)&iph[1])[2] = 0; | |
697 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 LT |
698 | |
699 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
700 | ih->type = type; |
701 | ih->code = 0; | |
702 | ih->csum = 0; | |
703 | ih->group = group; | |
704 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 705 | |
c439cb2e | 706 | return ip_local_out(skb); |
1da177e4 LT |
707 | } |
708 | ||
709 | static void igmp_gq_timer_expire(unsigned long data) | |
710 | { | |
711 | struct in_device *in_dev = (struct in_device *)data; | |
712 | ||
713 | in_dev->mr_gq_running = 0; | |
714 | igmpv3_send_report(in_dev, NULL); | |
715 | __in_dev_put(in_dev); | |
716 | } | |
717 | ||
718 | static void igmp_ifc_timer_expire(unsigned long data) | |
719 | { | |
720 | struct in_device *in_dev = (struct in_device *)data; | |
721 | ||
722 | igmpv3_send_cr(in_dev); | |
723 | if (in_dev->mr_ifc_count) { | |
724 | in_dev->mr_ifc_count--; | |
725 | igmp_ifc_start_timer(in_dev, IGMP_Unsolicited_Report_Interval); | |
726 | } | |
727 | __in_dev_put(in_dev); | |
728 | } | |
729 | ||
730 | static void igmp_ifc_event(struct in_device *in_dev) | |
731 | { | |
732 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
733 | return; | |
e905a9ed | 734 | in_dev->mr_ifc_count = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
735 | IGMP_Unsolicited_Report_Count; |
736 | igmp_ifc_start_timer(in_dev, 1); | |
737 | } | |
738 | ||
739 | ||
740 | static void igmp_timer_expire(unsigned long data) | |
741 | { | |
742 | struct ip_mc_list *im=(struct ip_mc_list *)data; | |
743 | struct in_device *in_dev = im->interface; | |
744 | ||
745 | spin_lock(&im->lock); | |
a7e9ff73 | 746 | im->tm_running = 0; |
1da177e4 LT |
747 | |
748 | if (im->unsolicit_count) { | |
749 | im->unsolicit_count--; | |
750 | igmp_start_timer(im, IGMP_Unsolicited_Report_Interval); | |
751 | } | |
752 | im->reporter = 1; | |
753 | spin_unlock(&im->lock); | |
754 | ||
755 | if (IGMP_V1_SEEN(in_dev)) | |
756 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
757 | else if (IGMP_V2_SEEN(in_dev)) | |
758 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
759 | else | |
760 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
761 | ||
762 | ip_ma_put(im); | |
763 | } | |
764 | ||
ad12583f | 765 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 766 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
767 | { |
768 | struct ip_sf_list *psf; | |
769 | int i, scount; | |
770 | ||
ad12583f DS |
771 | scount = 0; |
772 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
773 | if (scount == nsrcs) | |
774 | break; | |
775 | for (i=0; i<nsrcs; i++) { | |
776 | /* skip inactive filters */ | |
e05c4ad3 | 777 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
778 | pmc->sfcount[MCAST_EXCLUDE] != |
779 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 780 | break; |
ad12583f DS |
781 | if (srcs[i] == psf->sf_inaddr) { |
782 | scount++; | |
783 | break; | |
784 | } | |
785 | } | |
786 | } | |
787 | pmc->gsquery = 0; | |
788 | if (scount == nsrcs) /* all sources excluded */ | |
789 | return 0; | |
790 | return 1; | |
791 | } | |
792 | ||
ea4d9e72 | 793 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
794 | { |
795 | struct ip_sf_list *psf; | |
796 | int i, scount; | |
797 | ||
798 | if (pmc->sfmode == MCAST_EXCLUDE) | |
799 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
800 | ||
801 | /* mark INCLUDE-mode sources */ | |
1da177e4 LT |
802 | scount = 0; |
803 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
804 | if (scount == nsrcs) | |
805 | break; | |
806 | for (i=0; i<nsrcs; i++) | |
807 | if (srcs[i] == psf->sf_inaddr) { | |
808 | psf->sf_gsresp = 1; | |
809 | scount++; | |
810 | break; | |
811 | } | |
812 | } | |
ad12583f DS |
813 | if (!scount) { |
814 | pmc->gsquery = 0; | |
815 | return 0; | |
816 | } | |
817 | pmc->gsquery = 1; | |
818 | return 1; | |
1da177e4 LT |
819 | } |
820 | ||
d679c532 ED |
821 | /* return true if packet was dropped */ |
822 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
823 | { |
824 | struct ip_mc_list *im; | |
825 | ||
826 | /* Timers are only set for non-local groups */ | |
827 | ||
828 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 829 | return false; |
1da177e4 | 830 | |
1d7138de ED |
831 | rcu_read_lock(); |
832 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
833 | if (im->multiaddr == group) { |
834 | igmp_stop_timer(im); | |
835 | break; | |
836 | } | |
837 | } | |
1d7138de | 838 | rcu_read_unlock(); |
d679c532 | 839 | return false; |
1da177e4 LT |
840 | } |
841 | ||
d679c532 ED |
842 | /* return true if packet was dropped */ |
843 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
844 | int len) |
845 | { | |
d9edf9e2 ACM |
846 | struct igmphdr *ih = igmp_hdr(skb); |
847 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 848 | struct ip_mc_list *im; |
63007727 | 849 | __be32 group = ih->group; |
1da177e4 LT |
850 | int max_delay; |
851 | int mark = 0; | |
852 | ||
853 | ||
5b7c8406 | 854 | if (len == 8) { |
1da177e4 LT |
855 | if (ih->code == 0) { |
856 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 857 | |
1da177e4 LT |
858 | max_delay = IGMP_Query_Response_Interval; |
859 | in_dev->mr_v1_seen = jiffies + | |
860 | IGMP_V1_Router_Present_Timeout; | |
861 | group = 0; | |
862 | } else { | |
863 | /* v2 router present */ | |
864 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
865 | in_dev->mr_v2_seen = jiffies + | |
866 | IGMP_V2_Router_Present_Timeout; | |
867 | } | |
868 | /* cancel the interface change timer */ | |
869 | in_dev->mr_ifc_count = 0; | |
870 | if (del_timer(&in_dev->mr_ifc_timer)) | |
871 | __in_dev_put(in_dev); | |
872 | /* clear deleted report items */ | |
873 | igmpv3_clear_delrec(in_dev); | |
874 | } else if (len < 12) { | |
d679c532 | 875 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
876 | } else if (IGMP_V1_SEEN(in_dev)) { |
877 | /* This is a v3 query with v1 queriers present */ | |
878 | max_delay = IGMP_Query_Response_Interval; | |
879 | group = 0; | |
880 | } else if (IGMP_V2_SEEN(in_dev)) { | |
881 | /* this is a v3 query with v2 queriers present; | |
882 | * Interpretation of the max_delay code is problematic here. | |
883 | * A real v2 host would use ih_code directly, while v3 has a | |
884 | * different encoding. We use the v3 encoding as more likely | |
885 | * to be intended in a v3 query. | |
886 | */ | |
887 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
888 | if (!max_delay) |
889 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
890 | } else { /* v3 */ |
891 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 892 | return true; |
e905a9ed | 893 | |
d9edf9e2 | 894 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 895 | if (ih3->nsrcs) { |
e905a9ed | 896 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 897 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 898 | return true; |
d9edf9e2 | 899 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
900 | } |
901 | ||
902 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
903 | if (!max_delay) | |
904 | max_delay = 1; /* can't mod w/ 0 */ | |
905 | in_dev->mr_maxdelay = max_delay; | |
906 | if (ih3->qrv) | |
907 | in_dev->mr_qrv = ih3->qrv; | |
908 | if (!group) { /* general query */ | |
909 | if (ih3->nsrcs) | |
d679c532 | 910 | return false; /* no sources allowed */ |
1da177e4 | 911 | igmp_gq_start_timer(in_dev); |
d679c532 | 912 | return false; |
1da177e4 LT |
913 | } |
914 | /* mark sources to include, if group & source-specific */ | |
915 | mark = ih3->nsrcs != 0; | |
916 | } | |
917 | ||
918 | /* | |
919 | * - Start the timers in all of our membership records | |
920 | * that the query applies to for the interface on | |
921 | * which the query arrived excl. those that belong | |
922 | * to a "local" group (224.0.0.X) | |
923 | * - For timers already running check if they need to | |
924 | * be reset. | |
925 | * - Use the igmp->igmp_code field as the maximum | |
926 | * delay possible | |
927 | */ | |
1d7138de ED |
928 | rcu_read_lock(); |
929 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
930 | int changed; |
931 | ||
1da177e4 LT |
932 | if (group && group != im->multiaddr) |
933 | continue; | |
934 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
935 | continue; | |
936 | spin_lock_bh(&im->lock); | |
937 | if (im->tm_running) | |
938 | im->gsquery = im->gsquery && mark; | |
939 | else | |
940 | im->gsquery = mark; | |
ad12583f | 941 | changed = !im->gsquery || |
e905a9ed | 942 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 943 | spin_unlock_bh(&im->lock); |
ad12583f DS |
944 | if (changed) |
945 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 946 | } |
1d7138de | 947 | rcu_read_unlock(); |
d679c532 | 948 | return false; |
1da177e4 LT |
949 | } |
950 | ||
9a57a9d2 | 951 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
952 | int igmp_rcv(struct sk_buff *skb) |
953 | { | |
954 | /* This basically follows the spec line by line -- see RFC1112 */ | |
955 | struct igmphdr *ih; | |
9a57a9d2 | 956 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 | 957 | int len = skb->len; |
d679c532 | 958 | bool dropped = true; |
1da177e4 | 959 | |
cd557bc1 DL |
960 | if (in_dev == NULL) |
961 | goto drop; | |
1da177e4 | 962 | |
fb286bb2 | 963 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 964 | goto drop; |
fb286bb2 HX |
965 | |
966 | switch (skb->ip_summed) { | |
84fa7933 | 967 | case CHECKSUM_COMPLETE: |
d3bc23e7 | 968 | if (!csum_fold(skb->csum)) |
fb286bb2 HX |
969 | break; |
970 | /* fall through */ | |
971 | case CHECKSUM_NONE: | |
972 | skb->csum = 0; | |
973 | if (__skb_checksum_complete(skb)) | |
9a57a9d2 | 974 | goto drop; |
1da177e4 LT |
975 | } |
976 | ||
d9edf9e2 | 977 | ih = igmp_hdr(skb); |
1da177e4 LT |
978 | switch (ih->type) { |
979 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 980 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
981 | break; |
982 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
983 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 984 | /* Is it our report looped back? */ |
c7537967 | 985 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 986 | break; |
24c69275 DS |
987 | /* don't rely on MC router hearing unicast reports */ |
988 | if (skb->pkt_type == PACKET_MULTICAST || | |
989 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 990 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
991 | break; |
992 | case IGMP_PIM: | |
993 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
994 | return pim_rcv_v1(skb); |
995 | #endif | |
c6b471e6 | 996 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
997 | case IGMP_DVMRP: |
998 | case IGMP_TRACE: | |
999 | case IGMP_HOST_LEAVE_MESSAGE: | |
1000 | case IGMP_MTRACE: | |
1001 | case IGMP_MTRACE_RESP: | |
1002 | break; | |
1003 | default: | |
dd1c1853 | 1004 | break; |
1da177e4 | 1005 | } |
fb286bb2 | 1006 | |
cd557bc1 | 1007 | drop: |
d679c532 ED |
1008 | if (dropped) |
1009 | kfree_skb(skb); | |
1010 | else | |
1011 | consume_skb(skb); | |
1da177e4 LT |
1012 | return 0; |
1013 | } | |
1014 | ||
1015 | #endif | |
1016 | ||
1017 | ||
1018 | /* | |
1019 | * Add a filter to a device | |
1020 | */ | |
1021 | ||
63007727 | 1022 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1023 | { |
1024 | char buf[MAX_ADDR_LEN]; | |
1025 | struct net_device *dev = in_dev->dev; | |
1026 | ||
1027 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1028 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1029 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1030 | routine. Something sort of: |
1031 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1032 | --ANK | |
1033 | */ | |
1034 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1035 | dev_mc_add(dev, buf); |
1da177e4 LT |
1036 | } |
1037 | ||
1038 | /* | |
1039 | * Remove a filter from a device | |
1040 | */ | |
1041 | ||
63007727 | 1042 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1043 | { |
1044 | char buf[MAX_ADDR_LEN]; | |
1045 | struct net_device *dev = in_dev->dev; | |
1046 | ||
1047 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1048 | dev_mc_del(dev, buf); |
1da177e4 LT |
1049 | } |
1050 | ||
1051 | #ifdef CONFIG_IP_MULTICAST | |
1052 | /* | |
1053 | * deleted ip_mc_list manipulation | |
1054 | */ | |
1055 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1056 | { | |
1057 | struct ip_mc_list *pmc; | |
1058 | ||
1059 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1060 | * are actually used. In particular, the refcnt and users are not | |
1061 | * used for management of the delete list. Using the same structure | |
1062 | * for deleted items allows change reports to use common code with | |
1063 | * non-deleted or query-response MCA's. | |
1064 | */ | |
0da974f4 | 1065 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1066 | if (!pmc) |
1067 | return; | |
1da177e4 LT |
1068 | spin_lock_bh(&im->lock); |
1069 | pmc->interface = im->interface; | |
1070 | in_dev_hold(in_dev); | |
1071 | pmc->multiaddr = im->multiaddr; | |
1072 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1073 | IGMP_Unsolicited_Report_Count; | |
1074 | pmc->sfmode = im->sfmode; | |
1075 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1076 | struct ip_sf_list *psf; | |
1077 | ||
1078 | pmc->tomb = im->tomb; | |
1079 | pmc->sources = im->sources; | |
1080 | im->tomb = im->sources = NULL; | |
1081 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1082 | psf->sf_crcount = pmc->crcount; | |
1083 | } | |
1084 | spin_unlock_bh(&im->lock); | |
1085 | ||
1086 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1087 | pmc->next = in_dev->mc_tomb; | |
1088 | in_dev->mc_tomb = pmc; | |
1089 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1090 | } | |
1091 | ||
63007727 | 1092 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1093 | { |
1094 | struct ip_mc_list *pmc, *pmc_prev; | |
1095 | struct ip_sf_list *psf, *psf_next; | |
1096 | ||
1097 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1098 | pmc_prev = NULL; | |
1099 | for (pmc=in_dev->mc_tomb; pmc; pmc=pmc->next) { | |
1100 | if (pmc->multiaddr == multiaddr) | |
1101 | break; | |
1102 | pmc_prev = pmc; | |
1103 | } | |
1104 | if (pmc) { | |
1105 | if (pmc_prev) | |
1106 | pmc_prev->next = pmc->next; | |
1107 | else | |
1108 | in_dev->mc_tomb = pmc->next; | |
1109 | } | |
1110 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1111 | if (pmc) { | |
1112 | for (psf=pmc->tomb; psf; psf=psf_next) { | |
1113 | psf_next = psf->sf_next; | |
1114 | kfree(psf); | |
1115 | } | |
1116 | in_dev_put(pmc->interface); | |
1117 | kfree(pmc); | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1122 | { | |
1123 | struct ip_mc_list *pmc, *nextpmc; | |
1124 | ||
1125 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1126 | pmc = in_dev->mc_tomb; | |
1127 | in_dev->mc_tomb = NULL; | |
1128 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1129 | ||
1130 | for (; pmc; pmc = nextpmc) { | |
1131 | nextpmc = pmc->next; | |
1132 | ip_mc_clear_src(pmc); | |
1133 | in_dev_put(pmc->interface); | |
1134 | kfree(pmc); | |
1135 | } | |
1136 | /* clear dead sources, too */ | |
1d7138de ED |
1137 | rcu_read_lock(); |
1138 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1139 | struct ip_sf_list *psf, *psf_next; |
1140 | ||
1141 | spin_lock_bh(&pmc->lock); | |
1142 | psf = pmc->tomb; | |
1143 | pmc->tomb = NULL; | |
1144 | spin_unlock_bh(&pmc->lock); | |
1145 | for (; psf; psf=psf_next) { | |
1146 | psf_next = psf->sf_next; | |
1147 | kfree(psf); | |
1148 | } | |
1149 | } | |
1d7138de | 1150 | rcu_read_unlock(); |
1da177e4 LT |
1151 | } |
1152 | #endif | |
1153 | ||
1154 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1155 | { | |
1156 | struct in_device *in_dev = im->interface; | |
1157 | #ifdef CONFIG_IP_MULTICAST | |
1158 | int reporter; | |
1159 | #endif | |
1160 | ||
1161 | if (im->loaded) { | |
1162 | im->loaded = 0; | |
1163 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1164 | } | |
1165 | ||
1166 | #ifdef CONFIG_IP_MULTICAST | |
1167 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1168 | return; | |
1169 | ||
1170 | reporter = im->reporter; | |
1171 | igmp_stop_timer(im); | |
1172 | ||
1173 | if (!in_dev->dead) { | |
1174 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1175 | return; |
1da177e4 LT |
1176 | if (IGMP_V2_SEEN(in_dev)) { |
1177 | if (reporter) | |
1178 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1179 | return; |
1da177e4 LT |
1180 | } |
1181 | /* IGMPv3 */ | |
1182 | igmpv3_add_delrec(in_dev, im); | |
1183 | ||
1184 | igmp_ifc_event(in_dev); | |
1185 | } | |
1da177e4 | 1186 | #endif |
1da177e4 LT |
1187 | } |
1188 | ||
1189 | static void igmp_group_added(struct ip_mc_list *im) | |
1190 | { | |
1191 | struct in_device *in_dev = im->interface; | |
1192 | ||
1193 | if (im->loaded == 0) { | |
1194 | im->loaded = 1; | |
1195 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1196 | } | |
1197 | ||
1198 | #ifdef CONFIG_IP_MULTICAST | |
1199 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1200 | return; | |
1201 | ||
1202 | if (in_dev->dead) | |
1203 | return; | |
1204 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1205 | spin_lock_bh(&im->lock); | |
1206 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1207 | spin_unlock_bh(&im->lock); | |
1208 | return; | |
1209 | } | |
1210 | /* else, v3 */ | |
1211 | ||
1212 | im->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : | |
1213 | IGMP_Unsolicited_Report_Count; | |
1214 | igmp_ifc_event(in_dev); | |
1215 | #endif | |
1216 | } | |
1217 | ||
1218 | ||
1219 | /* | |
1220 | * Multicast list managers | |
1221 | */ | |
1222 | ||
e9897071 ED |
1223 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1224 | { | |
c70eba74 | 1225 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1226 | } |
1227 | ||
1228 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1229 | struct ip_mc_list *im) | |
1230 | { | |
1231 | struct ip_mc_list __rcu **mc_hash; | |
1232 | u32 hash; | |
1233 | ||
1234 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1235 | if (mc_hash) { | |
1236 | hash = ip_mc_hash(im); | |
c70eba74 | 1237 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1238 | rcu_assign_pointer(mc_hash[hash], im); |
1239 | return; | |
1240 | } | |
1241 | ||
1242 | /* do not use a hash table for small number of items */ | |
1243 | if (in_dev->mc_count < 4) | |
1244 | return; | |
1245 | ||
1246 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1247 | GFP_KERNEL); | |
1248 | if (!mc_hash) | |
1249 | return; | |
1250 | ||
1251 | for_each_pmc_rtnl(in_dev, im) { | |
1252 | hash = ip_mc_hash(im); | |
c70eba74 | 1253 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1254 | RCU_INIT_POINTER(mc_hash[hash], im); |
1255 | } | |
1256 | ||
1257 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1258 | } | |
1259 | ||
1260 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1261 | struct ip_mc_list *im) | |
1262 | { | |
1263 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1264 | struct ip_mc_list *aux; | |
1265 | ||
1266 | if (!mc_hash) | |
1267 | return; | |
1268 | mc_hash += ip_mc_hash(im); | |
1269 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1270 | mc_hash = &aux->next_hash; | |
1271 | *mc_hash = im->next_hash; | |
1272 | } | |
1273 | ||
1da177e4 LT |
1274 | |
1275 | /* | |
1276 | * A socket has joined a multicast group on device dev. | |
1277 | */ | |
1278 | ||
8f935bbd | 1279 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1280 | { |
1281 | struct ip_mc_list *im; | |
1282 | ||
1283 | ASSERT_RTNL(); | |
1284 | ||
1d7138de | 1285 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1286 | if (im->multiaddr == addr) { |
1287 | im->users++; | |
1288 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1289 | goto out; | |
1290 | } | |
1291 | } | |
1292 | ||
1d7138de | 1293 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1294 | if (!im) |
1295 | goto out; | |
1296 | ||
a7e9ff73 JK |
1297 | im->users = 1; |
1298 | im->interface = in_dev; | |
1da177e4 | 1299 | in_dev_hold(in_dev); |
a7e9ff73 | 1300 | im->multiaddr = addr; |
1da177e4 LT |
1301 | /* initial mode is (EX, empty) */ |
1302 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1303 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1304 | atomic_set(&im->refcnt, 1); |
1305 | spin_lock_init(&im->lock); | |
1306 | #ifdef CONFIG_IP_MULTICAST | |
b24b8a24 | 1307 | setup_timer(&im->timer, &igmp_timer_expire, (unsigned long)im); |
1da177e4 | 1308 | im->unsolicit_count = IGMP_Unsolicited_Report_Count; |
1da177e4 | 1309 | #endif |
1d7138de ED |
1310 | |
1311 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1312 | in_dev->mc_count++; |
cf778b00 | 1313 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1314 | |
e9897071 ED |
1315 | ip_mc_hash_add(in_dev, im); |
1316 | ||
1da177e4 LT |
1317 | #ifdef CONFIG_IP_MULTICAST |
1318 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1319 | #endif | |
1320 | igmp_group_added(im); | |
1321 | if (!in_dev->dead) | |
1322 | ip_rt_multicast_event(in_dev); | |
1323 | out: | |
1324 | return; | |
1325 | } | |
4bc2f18b | 1326 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1327 | |
a816c7c7 | 1328 | /* |
4aa5dee4 | 1329 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1330 | */ |
4aa5dee4 | 1331 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1332 | { |
08882669 | 1333 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1334 | struct ip_mc_list *im; |
1335 | int type; | |
a816c7c7 | 1336 | |
4aa5dee4 JP |
1337 | ASSERT_RTNL(); |
1338 | ||
1339 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1340 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1341 | continue; | |
a816c7c7 | 1342 | |
866f3b25 ED |
1343 | /* a failover is happening and switches |
1344 | * must be notified immediately | |
1345 | */ | |
1346 | if (IGMP_V1_SEEN(in_dev)) | |
1347 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1348 | else if (IGMP_V2_SEEN(in_dev)) | |
1349 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1350 | else | |
1351 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1352 | igmp_send_report(in_dev, im, type); | |
1353 | } | |
a816c7c7 JV |
1354 | #endif |
1355 | } | |
1356 | ||
1da177e4 LT |
1357 | /* |
1358 | * A socket has left a multicast group on device dev | |
1359 | */ | |
1360 | ||
8f935bbd | 1361 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1362 | { |
1d7138de ED |
1363 | struct ip_mc_list *i; |
1364 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1365 | |
1da177e4 | 1366 | ASSERT_RTNL(); |
e905a9ed | 1367 | |
1d7138de ED |
1368 | for (ip = &in_dev->mc_list; |
1369 | (i = rtnl_dereference(*ip)) != NULL; | |
1370 | ip = &i->next_rcu) { | |
a7e9ff73 | 1371 | if (i->multiaddr == addr) { |
1da177e4 | 1372 | if (--i->users == 0) { |
e9897071 | 1373 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1374 | *ip = i->next_rcu; |
b8bae41e | 1375 | in_dev->mc_count--; |
1da177e4 | 1376 | igmp_group_dropped(i); |
24cf3af3 | 1377 | ip_mc_clear_src(i); |
1da177e4 LT |
1378 | |
1379 | if (!in_dev->dead) | |
1380 | ip_rt_multicast_event(in_dev); | |
1381 | ||
1382 | ip_ma_put(i); | |
1383 | return; | |
1384 | } | |
1385 | break; | |
1386 | } | |
1387 | } | |
1388 | } | |
4bc2f18b | 1389 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1390 | |
75c78500 MS |
1391 | /* Device changing type */ |
1392 | ||
1393 | void ip_mc_unmap(struct in_device *in_dev) | |
1394 | { | |
1d7138de | 1395 | struct ip_mc_list *pmc; |
75c78500 MS |
1396 | |
1397 | ASSERT_RTNL(); | |
1398 | ||
1d7138de ED |
1399 | for_each_pmc_rtnl(in_dev, pmc) |
1400 | igmp_group_dropped(pmc); | |
75c78500 MS |
1401 | } |
1402 | ||
1403 | void ip_mc_remap(struct in_device *in_dev) | |
1404 | { | |
1d7138de | 1405 | struct ip_mc_list *pmc; |
75c78500 MS |
1406 | |
1407 | ASSERT_RTNL(); | |
1408 | ||
1d7138de ED |
1409 | for_each_pmc_rtnl(in_dev, pmc) |
1410 | igmp_group_added(pmc); | |
75c78500 MS |
1411 | } |
1412 | ||
1da177e4 LT |
1413 | /* Device going down */ |
1414 | ||
1415 | void ip_mc_down(struct in_device *in_dev) | |
1416 | { | |
1d7138de | 1417 | struct ip_mc_list *pmc; |
1da177e4 LT |
1418 | |
1419 | ASSERT_RTNL(); | |
1420 | ||
1d7138de ED |
1421 | for_each_pmc_rtnl(in_dev, pmc) |
1422 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1423 | |
1424 | #ifdef CONFIG_IP_MULTICAST | |
1425 | in_dev->mr_ifc_count = 0; | |
1426 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1427 | __in_dev_put(in_dev); | |
1428 | in_dev->mr_gq_running = 0; | |
1429 | if (del_timer(&in_dev->mr_gq_timer)) | |
1430 | __in_dev_put(in_dev); | |
1431 | igmpv3_clear_delrec(in_dev); | |
1432 | #endif | |
1433 | ||
1434 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1435 | } | |
1436 | ||
1437 | void ip_mc_init_dev(struct in_device *in_dev) | |
1438 | { | |
1439 | ASSERT_RTNL(); | |
1440 | ||
1da177e4 | 1441 | #ifdef CONFIG_IP_MULTICAST |
b24b8a24 PE |
1442 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1443 | (unsigned long)in_dev); | |
b24b8a24 PE |
1444 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1445 | (unsigned long)in_dev); | |
1da177e4 LT |
1446 | in_dev->mr_qrv = IGMP_Unsolicited_Report_Count; |
1447 | #endif | |
1448 | ||
1da177e4 LT |
1449 | spin_lock_init(&in_dev->mc_tomb_lock); |
1450 | } | |
1451 | ||
1452 | /* Device going up */ | |
1453 | ||
1454 | void ip_mc_up(struct in_device *in_dev) | |
1455 | { | |
1d7138de | 1456 | struct ip_mc_list *pmc; |
1da177e4 LT |
1457 | |
1458 | ASSERT_RTNL(); | |
1459 | ||
1460 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); | |
1461 | ||
1d7138de ED |
1462 | for_each_pmc_rtnl(in_dev, pmc) |
1463 | igmp_group_added(pmc); | |
1da177e4 LT |
1464 | } |
1465 | ||
1466 | /* | |
1467 | * Device is about to be destroyed: clean up. | |
1468 | */ | |
1469 | ||
1470 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1471 | { | |
1472 | struct ip_mc_list *i; | |
1473 | ||
1474 | ASSERT_RTNL(); | |
1475 | ||
1476 | /* Deactivate timers */ | |
1477 | ip_mc_down(in_dev); | |
1478 | ||
1d7138de ED |
1479 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1480 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1481 | in_dev->mc_count--; |
1d7138de | 1482 | |
24cf3af3 VF |
1483 | /* We've dropped the groups in ip_mc_down already */ |
1484 | ip_mc_clear_src(i); | |
1da177e4 | 1485 | ip_ma_put(i); |
1da177e4 | 1486 | } |
1da177e4 LT |
1487 | } |
1488 | ||
9e917dca | 1489 | /* RTNL is locked */ |
877acedc | 1490 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1491 | { |
1da177e4 LT |
1492 | struct net_device *dev = NULL; |
1493 | struct in_device *idev = NULL; | |
1494 | ||
1495 | if (imr->imr_ifindex) { | |
877acedc | 1496 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1497 | return idev; |
1498 | } | |
1499 | if (imr->imr_address.s_addr) { | |
9e917dca | 1500 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1501 | if (!dev) |
1502 | return NULL; | |
1da177e4 LT |
1503 | } |
1504 | ||
b23dd4fe | 1505 | if (!dev) { |
78fbfd8a DM |
1506 | struct rtable *rt = ip_route_output(net, |
1507 | imr->imr_multiaddr.s_addr, | |
1508 | 0, 0, 0); | |
b23dd4fe DM |
1509 | if (!IS_ERR(rt)) { |
1510 | dev = rt->dst.dev; | |
1511 | ip_rt_put(rt); | |
1512 | } | |
1da177e4 LT |
1513 | } |
1514 | if (dev) { | |
1515 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1516 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1517 | } |
1518 | return idev; | |
1519 | } | |
1520 | ||
1521 | /* | |
1522 | * Join a socket to a group | |
1523 | */ | |
ab32ea5d BH |
1524 | int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; |
1525 | int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; | |
1da177e4 LT |
1526 | |
1527 | ||
1528 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1529 | __be32 *psfsrc) |
1da177e4 LT |
1530 | { |
1531 | struct ip_sf_list *psf, *psf_prev; | |
1532 | int rv = 0; | |
1533 | ||
1534 | psf_prev = NULL; | |
1535 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1536 | if (psf->sf_inaddr == *psfsrc) | |
1537 | break; | |
1538 | psf_prev = psf; | |
1539 | } | |
1540 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1541 | /* source filter not found, or count wrong => bug */ | |
1542 | return -ESRCH; | |
1543 | } | |
1544 | psf->sf_count[sfmode]--; | |
1545 | if (psf->sf_count[sfmode] == 0) { | |
1546 | ip_rt_multicast_event(pmc->interface); | |
1547 | } | |
1548 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1549 | #ifdef CONFIG_IP_MULTICAST | |
1550 | struct in_device *in_dev = pmc->interface; | |
1551 | #endif | |
1552 | ||
1553 | /* no more filters for this source */ | |
1554 | if (psf_prev) | |
1555 | psf_prev->sf_next = psf->sf_next; | |
1556 | else | |
1557 | pmc->sources = psf->sf_next; | |
1558 | #ifdef CONFIG_IP_MULTICAST | |
1559 | if (psf->sf_oldin && | |
1560 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
e905a9ed | 1561 | psf->sf_crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1562 | IGMP_Unsolicited_Report_Count; |
1563 | psf->sf_next = pmc->tomb; | |
1564 | pmc->tomb = psf; | |
1565 | rv = 1; | |
1566 | } else | |
1567 | #endif | |
1568 | kfree(psf); | |
1569 | } | |
1570 | return rv; | |
1571 | } | |
1572 | ||
1573 | #ifndef CONFIG_IP_MULTICAST | |
1574 | #define igmp_ifc_event(x) do { } while (0) | |
1575 | #endif | |
1576 | ||
8f935bbd AV |
1577 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1578 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1579 | { |
1580 | struct ip_mc_list *pmc; | |
1581 | int changerec = 0; | |
1582 | int i, err; | |
1583 | ||
1584 | if (!in_dev) | |
1585 | return -ENODEV; | |
1d7138de ED |
1586 | rcu_read_lock(); |
1587 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1588 | if (*pmca == pmc->multiaddr) |
1589 | break; | |
1590 | } | |
1591 | if (!pmc) { | |
1592 | /* MCA not found?? bug */ | |
1d7138de | 1593 | rcu_read_unlock(); |
1da177e4 LT |
1594 | return -ESRCH; |
1595 | } | |
1596 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1597 | rcu_read_unlock(); |
1da177e4 LT |
1598 | #ifdef CONFIG_IP_MULTICAST |
1599 | sf_markstate(pmc); | |
1600 | #endif | |
1601 | if (!delta) { | |
1602 | err = -EINVAL; | |
1603 | if (!pmc->sfcount[sfmode]) | |
1604 | goto out_unlock; | |
1605 | pmc->sfcount[sfmode]--; | |
1606 | } | |
1607 | err = 0; | |
1608 | for (i=0; i<sfcount; i++) { | |
1609 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); | |
1610 | ||
1611 | changerec |= rv > 0; | |
1612 | if (!err && rv < 0) | |
1613 | err = rv; | |
1614 | } | |
1615 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1616 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1617 | pmc->sfcount[MCAST_INCLUDE]) { | |
1618 | #ifdef CONFIG_IP_MULTICAST | |
1619 | struct ip_sf_list *psf; | |
1620 | #endif | |
1621 | ||
1622 | /* filter mode change */ | |
1623 | pmc->sfmode = MCAST_INCLUDE; | |
1624 | #ifdef CONFIG_IP_MULTICAST | |
e905a9ed | 1625 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1626 | IGMP_Unsolicited_Report_Count; |
1627 | in_dev->mr_ifc_count = pmc->crcount; | |
1628 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1629 | psf->sf_crcount = 0; | |
1630 | igmp_ifc_event(pmc->interface); | |
1631 | } else if (sf_setstate(pmc) || changerec) { | |
1632 | igmp_ifc_event(pmc->interface); | |
1633 | #endif | |
1634 | } | |
1635 | out_unlock: | |
1636 | spin_unlock_bh(&pmc->lock); | |
1637 | return err; | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * Add multicast single-source filter to the interface list | |
1642 | */ | |
1643 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1644 | __be32 *psfsrc) |
1da177e4 LT |
1645 | { |
1646 | struct ip_sf_list *psf, *psf_prev; | |
1647 | ||
1648 | psf_prev = NULL; | |
1649 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1650 | if (psf->sf_inaddr == *psfsrc) | |
1651 | break; | |
1652 | psf_prev = psf; | |
1653 | } | |
1654 | if (!psf) { | |
0da974f4 | 1655 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1656 | if (!psf) |
1657 | return -ENOBUFS; | |
1da177e4 LT |
1658 | psf->sf_inaddr = *psfsrc; |
1659 | if (psf_prev) { | |
1660 | psf_prev->sf_next = psf; | |
1661 | } else | |
1662 | pmc->sources = psf; | |
1663 | } | |
1664 | psf->sf_count[sfmode]++; | |
1665 | if (psf->sf_count[sfmode] == 1) { | |
1666 | ip_rt_multicast_event(pmc->interface); | |
1667 | } | |
1668 | return 0; | |
1669 | } | |
1670 | ||
1671 | #ifdef CONFIG_IP_MULTICAST | |
1672 | static void sf_markstate(struct ip_mc_list *pmc) | |
1673 | { | |
1674 | struct ip_sf_list *psf; | |
1675 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1676 | ||
1677 | for (psf=pmc->sources; psf; psf=psf->sf_next) | |
1678 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1679 | psf->sf_oldin = mca_xcount == | |
1680 | psf->sf_count[MCAST_EXCLUDE] && | |
1681 | !psf->sf_count[MCAST_INCLUDE]; | |
1682 | } else | |
1683 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1684 | } | |
1685 | ||
1686 | static int sf_setstate(struct ip_mc_list *pmc) | |
1687 | { | |
ad12583f | 1688 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1689 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1690 | int qrv = pmc->interface->mr_qrv; | |
1691 | int new_in, rv; | |
1692 | ||
1693 | rv = 0; | |
1694 | for (psf=pmc->sources; psf; psf=psf->sf_next) { | |
1695 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
1696 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1697 | !psf->sf_count[MCAST_INCLUDE]; | |
1698 | } else | |
1699 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1700 | if (new_in) { |
1701 | if (!psf->sf_oldin) { | |
76edc605 | 1702 | struct ip_sf_list *prev = NULL; |
ad12583f DS |
1703 | |
1704 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) { | |
1705 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1706 | break; | |
1707 | prev = dpsf; | |
1708 | } | |
1709 | if (dpsf) { | |
1710 | if (prev) | |
1711 | prev->sf_next = dpsf->sf_next; | |
1712 | else | |
1713 | pmc->tomb = dpsf->sf_next; | |
1714 | kfree(dpsf); | |
1715 | } | |
1716 | psf->sf_crcount = qrv; | |
1717 | rv++; | |
1718 | } | |
1719 | } else if (psf->sf_oldin) { | |
1720 | ||
1721 | psf->sf_crcount = 0; | |
1722 | /* | |
1723 | * add or update "delete" records if an active filter | |
1724 | * is now inactive | |
1725 | */ | |
1726 | for (dpsf=pmc->tomb; dpsf; dpsf=dpsf->sf_next) | |
1727 | if (dpsf->sf_inaddr == psf->sf_inaddr) | |
1728 | break; | |
1729 | if (!dpsf) { | |
3ed37a6f | 1730 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1731 | if (!dpsf) |
1732 | continue; | |
1733 | *dpsf = *psf; | |
1734 | /* pmc->lock held by callers */ | |
1735 | dpsf->sf_next = pmc->tomb; | |
1736 | pmc->tomb = dpsf; | |
1737 | } | |
1738 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1739 | rv++; |
1740 | } | |
1741 | } | |
1742 | return rv; | |
1743 | } | |
1744 | #endif | |
1745 | ||
1746 | /* | |
1747 | * Add multicast source filter list to the interface list | |
1748 | */ | |
8f935bbd AV |
1749 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1750 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1751 | { |
1752 | struct ip_mc_list *pmc; | |
1753 | int isexclude; | |
1754 | int i, err; | |
1755 | ||
1756 | if (!in_dev) | |
1757 | return -ENODEV; | |
1d7138de ED |
1758 | rcu_read_lock(); |
1759 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1760 | if (*pmca == pmc->multiaddr) |
1761 | break; | |
1762 | } | |
1763 | if (!pmc) { | |
1764 | /* MCA not found?? bug */ | |
1d7138de | 1765 | rcu_read_unlock(); |
1da177e4 LT |
1766 | return -ESRCH; |
1767 | } | |
1768 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1769 | rcu_read_unlock(); |
1da177e4 LT |
1770 | |
1771 | #ifdef CONFIG_IP_MULTICAST | |
1772 | sf_markstate(pmc); | |
1773 | #endif | |
1774 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1775 | if (!delta) | |
1776 | pmc->sfcount[sfmode]++; | |
1777 | err = 0; | |
1778 | for (i=0; i<sfcount; i++) { | |
5eb81e89 | 1779 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
1780 | if (err) |
1781 | break; | |
1782 | } | |
1783 | if (err) { | |
1784 | int j; | |
1785 | ||
685f94e6 JZ |
1786 | if (!delta) |
1787 | pmc->sfcount[sfmode]--; | |
1da177e4 | 1788 | for (j=0; j<i; j++) |
a1889c0d | 1789 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
1790 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
1791 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 1792 | struct ip_sf_list *psf; |
cfcabdcc | 1793 | in_dev = pmc->interface; |
1da177e4 LT |
1794 | #endif |
1795 | ||
1796 | /* filter mode change */ | |
1797 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1798 | pmc->sfmode = MCAST_EXCLUDE; | |
1799 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1800 | pmc->sfmode = MCAST_INCLUDE; | |
1801 | #ifdef CONFIG_IP_MULTICAST | |
1802 | /* else no filters; keep old mode for reports */ | |
1803 | ||
e905a9ed | 1804 | pmc->crcount = in_dev->mr_qrv ? in_dev->mr_qrv : |
1da177e4 LT |
1805 | IGMP_Unsolicited_Report_Count; |
1806 | in_dev->mr_ifc_count = pmc->crcount; | |
1807 | for (psf=pmc->sources; psf; psf = psf->sf_next) | |
1808 | psf->sf_crcount = 0; | |
1809 | igmp_ifc_event(in_dev); | |
1810 | } else if (sf_setstate(pmc)) { | |
1811 | igmp_ifc_event(in_dev); | |
1812 | #endif | |
1813 | } | |
1814 | spin_unlock_bh(&pmc->lock); | |
1815 | return err; | |
1816 | } | |
1817 | ||
1818 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1819 | { | |
1820 | struct ip_sf_list *psf, *nextpsf; | |
1821 | ||
1822 | for (psf=pmc->tomb; psf; psf=nextpsf) { | |
1823 | nextpsf = psf->sf_next; | |
1824 | kfree(psf); | |
1825 | } | |
1826 | pmc->tomb = NULL; | |
1827 | for (psf=pmc->sources; psf; psf=nextpsf) { | |
1828 | nextpsf = psf->sf_next; | |
1829 | kfree(psf); | |
1830 | } | |
1831 | pmc->sources = NULL; | |
1832 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1833 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1834 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1835 | } | |
1836 | ||
1837 | ||
1838 | /* | |
1839 | * Join a multicast group | |
1840 | */ | |
1841 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1842 | { | |
1843 | int err; | |
8f935bbd | 1844 | __be32 addr = imr->imr_multiaddr.s_addr; |
a7e9ff73 | 1845 | struct ip_mc_socklist *iml = NULL, *i; |
1da177e4 LT |
1846 | struct in_device *in_dev; |
1847 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 1848 | struct net *net = sock_net(sk); |
ca9b907d | 1849 | int ifindex; |
1da177e4 LT |
1850 | int count = 0; |
1851 | ||
f97c1e0c | 1852 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1853 | return -EINVAL; |
1854 | ||
6756ae4b | 1855 | rtnl_lock(); |
1da177e4 | 1856 | |
877acedc | 1857 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
1858 | |
1859 | if (!in_dev) { | |
1860 | iml = NULL; | |
1861 | err = -ENODEV; | |
1862 | goto done; | |
1863 | } | |
1864 | ||
1da177e4 | 1865 | err = -EADDRINUSE; |
ca9b907d | 1866 | ifindex = imr->imr_ifindex; |
1d7138de | 1867 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
1868 | if (i->multi.imr_multiaddr.s_addr == addr && |
1869 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1870 | goto done; |
1da177e4 LT |
1871 | count++; |
1872 | } | |
1873 | err = -ENOBUFS; | |
ca9b907d DS |
1874 | if (count >= sysctl_igmp_max_memberships) |
1875 | goto done; | |
a7e9ff73 | 1876 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
ca9b907d | 1877 | if (iml == NULL) |
1da177e4 | 1878 | goto done; |
ca9b907d | 1879 | |
1da177e4 | 1880 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 1881 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
1882 | iml->sflist = NULL; |
1883 | iml->sfmode = MCAST_EXCLUDE; | |
cf778b00 | 1884 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 1885 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 1886 | err = 0; |
1da177e4 | 1887 | done: |
6756ae4b | 1888 | rtnl_unlock(); |
1da177e4 LT |
1889 | return err; |
1890 | } | |
4bc2f18b | 1891 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
1892 | |
1893 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
1894 | struct in_device *in_dev) | |
1895 | { | |
1d7138de | 1896 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
1897 | int err; |
1898 | ||
c85bb41e | 1899 | if (psf == NULL) { |
1da177e4 LT |
1900 | /* any-source empty exclude case */ |
1901 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1902 | iml->sfmode, 0, NULL, 0); | |
1903 | } | |
1904 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 1905 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 1906 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
1907 | /* decrease mem now to avoid the memleak warning */ |
1908 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 1909 | kfree_rcu(psf, rcu); |
1da177e4 LT |
1910 | return err; |
1911 | } | |
1912 | ||
1913 | /* | |
1914 | * Ask a socket to leave a group. | |
1915 | */ | |
1916 | ||
1917 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1918 | { | |
1919 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
1920 | struct ip_mc_socklist *iml; |
1921 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 1922 | struct in_device *in_dev; |
877acedc | 1923 | struct net *net = sock_net(sk); |
8f935bbd | 1924 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 1925 | u32 ifindex; |
acd6e00b | 1926 | int ret = -EADDRNOTAVAIL; |
1da177e4 LT |
1927 | |
1928 | rtnl_lock(); | |
877acedc | 1929 | in_dev = ip_mc_find_dev(net, imr); |
84b42bae | 1930 | ifindex = imr->imr_ifindex; |
1d7138de ED |
1931 | for (imlp = &inet->mc_list; |
1932 | (iml = rtnl_dereference(*imlp)) != NULL; | |
1933 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
1934 | if (iml->multi.imr_multiaddr.s_addr != group) |
1935 | continue; | |
1936 | if (ifindex) { | |
1937 | if (iml->multi.imr_ifindex != ifindex) | |
1938 | continue; | |
1939 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
1940 | iml->multi.imr_address.s_addr) | |
1941 | continue; | |
1da177e4 | 1942 | |
acd6e00b | 1943 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 1944 | |
1d7138de | 1945 | *imlp = iml->next_rcu; |
acd6e00b DS |
1946 | |
1947 | if (in_dev) | |
84b42bae | 1948 | ip_mc_dec_group(in_dev, group); |
acd6e00b | 1949 | rtnl_unlock(); |
c85bb41e FL |
1950 | /* decrease mem now to avoid the memleak warning */ |
1951 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 1952 | kfree_rcu(iml, rcu); |
acd6e00b | 1953 | return 0; |
1da177e4 | 1954 | } |
acd6e00b DS |
1955 | if (!in_dev) |
1956 | ret = -ENODEV; | |
1da177e4 | 1957 | rtnl_unlock(); |
acd6e00b | 1958 | return ret; |
1da177e4 | 1959 | } |
193ba924 | 1960 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
1961 | |
1962 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1963 | ip_mreq_source *mreqs, int ifindex) | |
1964 | { | |
1965 | int err; | |
1966 | struct ip_mreqn imr; | |
63007727 | 1967 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
1968 | struct ip_mc_socklist *pmc; |
1969 | struct in_device *in_dev = NULL; | |
1970 | struct inet_sock *inet = inet_sk(sk); | |
1971 | struct ip_sf_socklist *psl; | |
877acedc | 1972 | struct net *net = sock_net(sk); |
8cdaaa15 | 1973 | int leavegroup = 0; |
1da177e4 LT |
1974 | int i, j, rv; |
1975 | ||
f97c1e0c | 1976 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1977 | return -EINVAL; |
1978 | ||
6756ae4b | 1979 | rtnl_lock(); |
1da177e4 LT |
1980 | |
1981 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1982 | imr.imr_address.s_addr = mreqs->imr_interface; | |
1983 | imr.imr_ifindex = ifindex; | |
877acedc | 1984 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
1985 | |
1986 | if (!in_dev) { | |
1987 | err = -ENODEV; | |
1988 | goto done; | |
1989 | } | |
1990 | err = -EADDRNOTAVAIL; | |
1991 | ||
1d7138de | 1992 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
1993 | if ((pmc->multi.imr_multiaddr.s_addr == |
1994 | imr.imr_multiaddr.s_addr) && | |
1995 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
1996 | break; |
1997 | } | |
917f2f10 DS |
1998 | if (!pmc) { /* must have a prior join */ |
1999 | err = -EINVAL; | |
1da177e4 | 2000 | goto done; |
917f2f10 | 2001 | } |
1da177e4 LT |
2002 | /* if a source filter was set, must be the same mode as before */ |
2003 | if (pmc->sflist) { | |
917f2f10 DS |
2004 | if (pmc->sfmode != omode) { |
2005 | err = -EINVAL; | |
1da177e4 | 2006 | goto done; |
917f2f10 | 2007 | } |
1da177e4 LT |
2008 | } else if (pmc->sfmode != omode) { |
2009 | /* allow mode switches for empty-set filters */ | |
2010 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2011 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2012 | NULL, 0); |
2013 | pmc->sfmode = omode; | |
2014 | } | |
2015 | ||
1d7138de | 2016 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2017 | if (!add) { |
2018 | if (!psl) | |
917f2f10 | 2019 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 LT |
2020 | rv = !0; |
2021 | for (i=0; i<psl->sl_count; i++) { | |
2022 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 2023 | sizeof(__be32)); |
1da177e4 LT |
2024 | if (rv == 0) |
2025 | break; | |
2026 | } | |
2027 | if (rv) /* source not found */ | |
917f2f10 | 2028 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2029 | |
8cdaaa15 DS |
2030 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2031 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2032 | leavegroup = 1; | |
2033 | goto done; | |
2034 | } | |
2035 | ||
1da177e4 | 2036 | /* update the interface filter */ |
e905a9ed | 2037 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2038 | &mreqs->imr_sourceaddr, 1); |
2039 | ||
2040 | for (j=i+1; j<psl->sl_count; j++) | |
2041 | psl->sl_addr[j-1] = psl->sl_addr[j]; | |
2042 | psl->sl_count--; | |
2043 | err = 0; | |
2044 | goto done; | |
2045 | } | |
2046 | /* else, add a new source to the filter */ | |
2047 | ||
2048 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
2049 | err = -ENOBUFS; | |
2050 | goto done; | |
2051 | } | |
2052 | if (!psl || psl->sl_count == psl->sl_max) { | |
2053 | struct ip_sf_socklist *newpsl; | |
2054 | int count = IP_SFBLOCK; | |
2055 | ||
2056 | if (psl) | |
2057 | count += psl->sl_max; | |
8b3a7005 | 2058 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2059 | if (!newpsl) { |
2060 | err = -ENOBUFS; | |
2061 | goto done; | |
2062 | } | |
2063 | newpsl->sl_max = count; | |
2064 | newpsl->sl_count = count - IP_SFBLOCK; | |
2065 | if (psl) { | |
2066 | for (i=0; i<psl->sl_count; i++) | |
2067 | newpsl->sl_addr[i] = psl->sl_addr[i]; | |
c85bb41e FL |
2068 | /* decrease mem now to avoid the memleak warning */ |
2069 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2070 | kfree_rcu(psl, rcu); |
1da177e4 | 2071 | } |
cf778b00 | 2072 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2073 | psl = newpsl; |
1da177e4 LT |
2074 | } |
2075 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
2076 | for (i=0; i<psl->sl_count; i++) { | |
2077 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, | |
63007727 | 2078 | sizeof(__be32)); |
1da177e4 LT |
2079 | if (rv == 0) |
2080 | break; | |
2081 | } | |
2082 | if (rv == 0) /* address already there is an error */ | |
2083 | goto done; | |
2084 | for (j=psl->sl_count-1; j>=i; j--) | |
2085 | psl->sl_addr[j+1] = psl->sl_addr[j]; | |
2086 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2087 | psl->sl_count++; | |
2088 | err = 0; | |
2089 | /* update the interface list */ | |
e905a9ed | 2090 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2091 | &mreqs->imr_sourceaddr, 1); |
2092 | done: | |
6756ae4b | 2093 | rtnl_unlock(); |
8cdaaa15 DS |
2094 | if (leavegroup) |
2095 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2096 | return err; |
2097 | } | |
2098 | ||
2099 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2100 | { | |
9951f036 | 2101 | int err = 0; |
1da177e4 | 2102 | struct ip_mreqn imr; |
63007727 | 2103 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2104 | struct ip_mc_socklist *pmc; |
2105 | struct in_device *in_dev; | |
2106 | struct inet_sock *inet = inet_sk(sk); | |
2107 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2108 | struct net *net = sock_net(sk); |
9951f036 | 2109 | int leavegroup = 0; |
1da177e4 | 2110 | |
f97c1e0c | 2111 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2112 | return -EINVAL; |
2113 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2114 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2115 | return -EINVAL; | |
2116 | ||
6756ae4b | 2117 | rtnl_lock(); |
1da177e4 LT |
2118 | |
2119 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2120 | imr.imr_address.s_addr = msf->imsf_interface; | |
2121 | imr.imr_ifindex = ifindex; | |
877acedc | 2122 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2123 | |
2124 | if (!in_dev) { | |
2125 | err = -ENODEV; | |
2126 | goto done; | |
2127 | } | |
1da177e4 | 2128 | |
9951f036 DS |
2129 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2130 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2131 | leavegroup = 1; | |
2132 | goto done; | |
2133 | } | |
2134 | ||
1d7138de | 2135 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2136 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2137 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2138 | break; | |
2139 | } | |
917f2f10 DS |
2140 | if (!pmc) { /* must have a prior join */ |
2141 | err = -EINVAL; | |
1da177e4 | 2142 | goto done; |
917f2f10 | 2143 | } |
1da177e4 | 2144 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2145 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2146 | GFP_KERNEL); | |
1da177e4 LT |
2147 | if (!newpsl) { |
2148 | err = -ENOBUFS; | |
2149 | goto done; | |
2150 | } | |
2151 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2152 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2153 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2154 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2155 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2156 | if (err) { | |
2157 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2158 | goto done; | |
2159 | } | |
8713dbf0 | 2160 | } else { |
1da177e4 | 2161 | newpsl = NULL; |
8713dbf0 YZ |
2162 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2163 | msf->imsf_fmode, 0, NULL, 0); | |
2164 | } | |
1d7138de | 2165 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2166 | if (psl) { |
2167 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2168 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2169 | /* decrease mem now to avoid the memleak warning */ |
2170 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2171 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2172 | } else |
2173 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2174 | 0, NULL, 0); | |
cf778b00 | 2175 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2176 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2177 | err = 0; |
1da177e4 | 2178 | done: |
6756ae4b | 2179 | rtnl_unlock(); |
9951f036 DS |
2180 | if (leavegroup) |
2181 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2182 | return err; |
2183 | } | |
2184 | ||
2185 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2186 | struct ip_msfilter __user *optval, int __user *optlen) | |
2187 | { | |
2188 | int err, len, count, copycount; | |
2189 | struct ip_mreqn imr; | |
63007727 | 2190 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2191 | struct ip_mc_socklist *pmc; |
2192 | struct in_device *in_dev; | |
2193 | struct inet_sock *inet = inet_sk(sk); | |
2194 | struct ip_sf_socklist *psl; | |
877acedc | 2195 | struct net *net = sock_net(sk); |
1da177e4 | 2196 | |
f97c1e0c | 2197 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2198 | return -EINVAL; |
2199 | ||
6756ae4b | 2200 | rtnl_lock(); |
1da177e4 LT |
2201 | |
2202 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2203 | imr.imr_address.s_addr = msf->imsf_interface; | |
2204 | imr.imr_ifindex = 0; | |
877acedc | 2205 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2206 | |
2207 | if (!in_dev) { | |
2208 | err = -ENODEV; | |
2209 | goto done; | |
2210 | } | |
2211 | err = -EADDRNOTAVAIL; | |
2212 | ||
1d7138de | 2213 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2214 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2215 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2216 | break; | |
2217 | } | |
2218 | if (!pmc) /* must have a prior join */ | |
2219 | goto done; | |
2220 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2221 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2222 | rtnl_unlock(); |
1da177e4 LT |
2223 | if (!psl) { |
2224 | len = 0; | |
2225 | count = 0; | |
2226 | } else { | |
2227 | count = psl->sl_count; | |
2228 | } | |
2229 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2230 | len = copycount * sizeof(psl->sl_addr[0]); | |
2231 | msf->imsf_numsrc = count; | |
2232 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2233 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2234 | return -EFAULT; | |
2235 | } | |
2236 | if (len && | |
2237 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2238 | return -EFAULT; | |
2239 | return 0; | |
2240 | done: | |
6756ae4b | 2241 | rtnl_unlock(); |
1da177e4 LT |
2242 | return err; |
2243 | } | |
2244 | ||
2245 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2246 | struct group_filter __user *optval, int __user *optlen) | |
2247 | { | |
2248 | int err, i, count, copycount; | |
2249 | struct sockaddr_in *psin; | |
63007727 | 2250 | __be32 addr; |
1da177e4 LT |
2251 | struct ip_mc_socklist *pmc; |
2252 | struct inet_sock *inet = inet_sk(sk); | |
2253 | struct ip_sf_socklist *psl; | |
2254 | ||
2255 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2256 | if (psin->sin_family != AF_INET) | |
2257 | return -EINVAL; | |
2258 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2259 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2260 | return -EINVAL; |
2261 | ||
6756ae4b | 2262 | rtnl_lock(); |
1da177e4 LT |
2263 | |
2264 | err = -EADDRNOTAVAIL; | |
2265 | ||
1d7138de | 2266 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2267 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2268 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2269 | break; | |
2270 | } | |
2271 | if (!pmc) /* must have a prior join */ | |
2272 | goto done; | |
2273 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2274 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2275 | rtnl_unlock(); |
1da177e4 LT |
2276 | count = psl ? psl->sl_count : 0; |
2277 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2278 | gsf->gf_numsrc = count; | |
2279 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2280 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2281 | return -EFAULT; | |
2282 | } | |
2283 | for (i=0; i<copycount; i++) { | |
1da177e4 LT |
2284 | struct sockaddr_storage ss; |
2285 | ||
2286 | psin = (struct sockaddr_in *)&ss; | |
2287 | memset(&ss, 0, sizeof(ss)); | |
2288 | psin->sin_family = AF_INET; | |
2289 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2290 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2291 | return -EFAULT; | |
2292 | } | |
2293 | return 0; | |
2294 | done: | |
6756ae4b | 2295 | rtnl_unlock(); |
1da177e4 LT |
2296 | return err; |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2301 | */ | |
c0cda068 | 2302 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2303 | { |
2304 | struct inet_sock *inet = inet_sk(sk); | |
2305 | struct ip_mc_socklist *pmc; | |
2306 | struct ip_sf_socklist *psl; | |
2307 | int i; | |
c85bb41e | 2308 | int ret; |
1da177e4 | 2309 | |
c85bb41e | 2310 | ret = 1; |
f97c1e0c | 2311 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2312 | goto out; |
1da177e4 | 2313 | |
c85bb41e | 2314 | rcu_read_lock(); |
1d7138de | 2315 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2316 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2317 | pmc->multi.imr_ifindex == dif) | |
2318 | break; | |
2319 | } | |
c85bb41e | 2320 | ret = inet->mc_all; |
1da177e4 | 2321 | if (!pmc) |
c85bb41e | 2322 | goto unlock; |
1d7138de | 2323 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2324 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2325 | if (!psl) |
c85bb41e | 2326 | goto unlock; |
1da177e4 LT |
2327 | |
2328 | for (i=0; i<psl->sl_count; i++) { | |
2329 | if (psl->sl_addr[i] == rmt_addr) | |
2330 | break; | |
2331 | } | |
c85bb41e | 2332 | ret = 0; |
1da177e4 | 2333 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2334 | goto unlock; |
1da177e4 | 2335 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2336 | goto unlock; |
2337 | ret = 1; | |
2338 | unlock: | |
2339 | rcu_read_unlock(); | |
2340 | out: | |
2341 | return ret; | |
1da177e4 LT |
2342 | } |
2343 | ||
2344 | /* | |
2345 | * A socket is closing. | |
2346 | */ | |
2347 | ||
2348 | void ip_mc_drop_socket(struct sock *sk) | |
2349 | { | |
2350 | struct inet_sock *inet = inet_sk(sk); | |
2351 | struct ip_mc_socklist *iml; | |
877acedc | 2352 | struct net *net = sock_net(sk); |
1da177e4 LT |
2353 | |
2354 | if (inet->mc_list == NULL) | |
2355 | return; | |
2356 | ||
2357 | rtnl_lock(); | |
1d7138de | 2358 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2359 | struct in_device *in_dev; |
1da177e4 | 2360 | |
1d7138de | 2361 | inet->mc_list = iml->next_rcu; |
877acedc | 2362 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2363 | (void) ip_mc_leave_src(sk, iml, in_dev); |
18943d29 | 2364 | if (in_dev != NULL) |
1da177e4 | 2365 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2366 | /* decrease mem now to avoid the memleak warning */ |
2367 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2368 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2369 | } |
2370 | rtnl_unlock(); | |
2371 | } | |
2372 | ||
dbdd9a52 DM |
2373 | /* called with rcu_read_lock() */ |
2374 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) | |
1da177e4 LT |
2375 | { |
2376 | struct ip_mc_list *im; | |
e9897071 | 2377 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2378 | struct ip_sf_list *psf; |
2379 | int rv = 0; | |
2380 | ||
e9897071 ED |
2381 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2382 | if (mc_hash) { | |
c70eba74 | 2383 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2384 | |
2385 | for (im = rcu_dereference(mc_hash[hash]); | |
2386 | im != NULL; | |
2387 | im = rcu_dereference(im->next_hash)) { | |
2388 | if (im->multiaddr == mc_addr) | |
2389 | break; | |
2390 | } | |
2391 | } else { | |
2392 | for_each_pmc_rcu(in_dev, im) { | |
2393 | if (im->multiaddr == mc_addr) | |
2394 | break; | |
2395 | } | |
1da177e4 LT |
2396 | } |
2397 | if (im && proto == IPPROTO_IGMP) { | |
2398 | rv = 1; | |
2399 | } else if (im) { | |
2400 | if (src_addr) { | |
2401 | for (psf=im->sources; psf; psf=psf->sf_next) { | |
2402 | if (psf->sf_inaddr == src_addr) | |
2403 | break; | |
2404 | } | |
2405 | if (psf) | |
2406 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2407 | psf->sf_count[MCAST_EXCLUDE] != | |
2408 | im->sfcount[MCAST_EXCLUDE]; | |
2409 | else | |
2410 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2411 | } else | |
2412 | rv = 1; /* unspecified source; tentatively allow */ | |
2413 | } | |
1da177e4 LT |
2414 | return rv; |
2415 | } | |
2416 | ||
2417 | #if defined(CONFIG_PROC_FS) | |
2418 | struct igmp_mc_iter_state { | |
7091e728 | 2419 | struct seq_net_private p; |
1da177e4 LT |
2420 | struct net_device *dev; |
2421 | struct in_device *in_dev; | |
2422 | }; | |
2423 | ||
2424 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2425 | ||
2426 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2427 | { | |
7091e728 | 2428 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2429 | struct ip_mc_list *im = NULL; |
2430 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2431 | ||
7562f876 | 2432 | state->in_dev = NULL; |
61fbab77 | 2433 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2434 | struct in_device *in_dev; |
6baff150 ED |
2435 | |
2436 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2437 | if (!in_dev) |
2438 | continue; | |
1d7138de | 2439 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2440 | if (im) { |
2441 | state->in_dev = in_dev; | |
2442 | break; | |
2443 | } | |
1da177e4 LT |
2444 | } |
2445 | return im; | |
2446 | } | |
2447 | ||
2448 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2449 | { | |
2450 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2451 | |
1d7138de ED |
2452 | im = rcu_dereference(im->next_rcu); |
2453 | while (!im) { | |
6baff150 | 2454 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2455 | if (!state->dev) { |
2456 | state->in_dev = NULL; | |
2457 | break; | |
2458 | } | |
6baff150 | 2459 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2460 | if (!state->in_dev) |
2461 | continue; | |
1d7138de | 2462 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2463 | } |
2464 | return im; | |
2465 | } | |
2466 | ||
2467 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2468 | { | |
2469 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2470 | if (im) | |
2471 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2472 | --pos; | |
2473 | return pos ? NULL : im; | |
2474 | } | |
2475 | ||
2476 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2477 | __acquires(rcu) |
1da177e4 | 2478 | { |
61fbab77 | 2479 | rcu_read_lock(); |
1da177e4 LT |
2480 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2481 | } | |
2482 | ||
2483 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2484 | { | |
2485 | struct ip_mc_list *im; | |
2486 | if (v == SEQ_START_TOKEN) | |
2487 | im = igmp_mc_get_first(seq); | |
2488 | else | |
2489 | im = igmp_mc_get_next(seq, v); | |
2490 | ++*pos; | |
2491 | return im; | |
2492 | } | |
2493 | ||
2494 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2495 | __releases(rcu) |
1da177e4 LT |
2496 | { |
2497 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2498 | |
2499 | state->in_dev = NULL; | |
1da177e4 | 2500 | state->dev = NULL; |
61fbab77 | 2501 | rcu_read_unlock(); |
1da177e4 LT |
2502 | } |
2503 | ||
2504 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2505 | { | |
2506 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2507 | seq_puts(seq, |
1da177e4 LT |
2508 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2509 | else { | |
2510 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2511 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2512 | char *querier; | |
a399a805 ED |
2513 | long delta; |
2514 | ||
1da177e4 LT |
2515 | #ifdef CONFIG_IP_MULTICAST |
2516 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2517 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2518 | "V3"; | |
2519 | #else | |
2520 | querier = "NONE"; | |
2521 | #endif | |
2522 | ||
1d7138de | 2523 | if (rcu_dereference(state->in_dev->mc_list) == im) { |
1da177e4 | 2524 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2525 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2526 | } |
2527 | ||
a399a805 | 2528 | delta = im->timer.expires - jiffies; |
1da177e4 | 2529 | seq_printf(seq, |
338fcf98 | 2530 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2531 | im->multiaddr, im->users, |
a399a805 ED |
2532 | im->tm_running, |
2533 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2534 | im->reporter); |
2535 | } | |
2536 | return 0; | |
2537 | } | |
2538 | ||
f690808e | 2539 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2540 | .start = igmp_mc_seq_start, |
2541 | .next = igmp_mc_seq_next, | |
2542 | .stop = igmp_mc_seq_stop, | |
2543 | .show = igmp_mc_seq_show, | |
2544 | }; | |
2545 | ||
2546 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2547 | { | |
7091e728 | 2548 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2549 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2550 | } |
2551 | ||
9a32144e | 2552 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2553 | .owner = THIS_MODULE, |
2554 | .open = igmp_mc_seq_open, | |
2555 | .read = seq_read, | |
2556 | .llseek = seq_lseek, | |
7091e728 | 2557 | .release = seq_release_net, |
1da177e4 LT |
2558 | }; |
2559 | ||
2560 | struct igmp_mcf_iter_state { | |
7091e728 | 2561 | struct seq_net_private p; |
1da177e4 LT |
2562 | struct net_device *dev; |
2563 | struct in_device *idev; | |
2564 | struct ip_mc_list *im; | |
2565 | }; | |
2566 | ||
2567 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2568 | ||
2569 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2570 | { | |
7091e728 | 2571 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2572 | struct ip_sf_list *psf = NULL; |
2573 | struct ip_mc_list *im = NULL; | |
2574 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2575 | ||
7562f876 PE |
2576 | state->idev = NULL; |
2577 | state->im = NULL; | |
61fbab77 | 2578 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2579 | struct in_device *idev; |
6baff150 | 2580 | idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2581 | if (unlikely(idev == NULL)) |
2582 | continue; | |
1d7138de | 2583 | im = rcu_dereference(idev->mc_list); |
1da177e4 LT |
2584 | if (likely(im != NULL)) { |
2585 | spin_lock_bh(&im->lock); | |
2586 | psf = im->sources; | |
2587 | if (likely(psf != NULL)) { | |
2588 | state->im = im; | |
2589 | state->idev = idev; | |
2590 | break; | |
2591 | } | |
2592 | spin_unlock_bh(&im->lock); | |
2593 | } | |
1da177e4 LT |
2594 | } |
2595 | return psf; | |
2596 | } | |
2597 | ||
2598 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2599 | { | |
2600 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2601 | ||
2602 | psf = psf->sf_next; | |
2603 | while (!psf) { | |
2604 | spin_unlock_bh(&state->im->lock); | |
2605 | state->im = state->im->next; | |
2606 | while (!state->im) { | |
6baff150 | 2607 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2608 | if (!state->dev) { |
2609 | state->idev = NULL; | |
2610 | goto out; | |
2611 | } | |
6baff150 | 2612 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2613 | if (!state->idev) |
2614 | continue; | |
1d7138de | 2615 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2616 | } |
2617 | if (!state->im) | |
2618 | break; | |
2619 | spin_lock_bh(&state->im->lock); | |
2620 | psf = state->im->sources; | |
2621 | } | |
2622 | out: | |
2623 | return psf; | |
2624 | } | |
2625 | ||
2626 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2627 | { | |
2628 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2629 | if (psf) | |
2630 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2631 | --pos; | |
2632 | return pos ? NULL : psf; | |
2633 | } | |
2634 | ||
2635 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2636 | __acquires(rcu) |
1da177e4 | 2637 | { |
61fbab77 | 2638 | rcu_read_lock(); |
1da177e4 LT |
2639 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2640 | } | |
2641 | ||
2642 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2643 | { | |
2644 | struct ip_sf_list *psf; | |
2645 | if (v == SEQ_START_TOKEN) | |
2646 | psf = igmp_mcf_get_first(seq); | |
2647 | else | |
2648 | psf = igmp_mcf_get_next(seq, v); | |
2649 | ++*pos; | |
2650 | return psf; | |
2651 | } | |
2652 | ||
2653 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2654 | __releases(rcu) |
1da177e4 LT |
2655 | { |
2656 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2657 | if (likely(state->im != NULL)) { | |
2658 | spin_unlock_bh(&state->im->lock); | |
2659 | state->im = NULL; | |
2660 | } | |
1d7138de | 2661 | state->idev = NULL; |
1da177e4 | 2662 | state->dev = NULL; |
61fbab77 | 2663 | rcu_read_unlock(); |
1da177e4 LT |
2664 | } |
2665 | ||
2666 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2667 | { | |
2668 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2669 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2670 | ||
2671 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2672 | seq_printf(seq, |
1da177e4 LT |
2673 | "%3s %6s " |
2674 | "%10s %10s %6s %6s\n", "Idx", | |
2675 | "Device", "MCA", | |
2676 | "SRC", "INC", "EXC"); | |
2677 | } else { | |
2678 | seq_printf(seq, | |
2679 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2680 | "0x%08x %6lu %6lu\n", |
2681 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2682 | ntohl(state->im->multiaddr), |
2683 | ntohl(psf->sf_inaddr), | |
2684 | psf->sf_count[MCAST_INCLUDE], | |
2685 | psf->sf_count[MCAST_EXCLUDE]); | |
2686 | } | |
2687 | return 0; | |
2688 | } | |
2689 | ||
f690808e | 2690 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2691 | .start = igmp_mcf_seq_start, |
2692 | .next = igmp_mcf_seq_next, | |
2693 | .stop = igmp_mcf_seq_stop, | |
2694 | .show = igmp_mcf_seq_show, | |
2695 | }; | |
2696 | ||
2697 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2698 | { | |
7091e728 | 2699 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2700 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2701 | } |
2702 | ||
9a32144e | 2703 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2704 | .owner = THIS_MODULE, |
2705 | .open = igmp_mcf_seq_open, | |
2706 | .read = seq_read, | |
2707 | .llseek = seq_lseek, | |
7091e728 | 2708 | .release = seq_release_net, |
1da177e4 LT |
2709 | }; |
2710 | ||
2c8c1e72 | 2711 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2712 | { |
7091e728 AD |
2713 | struct proc_dir_entry *pde; |
2714 | ||
d4beaa66 | 2715 | pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); |
7091e728 AD |
2716 | if (!pde) |
2717 | goto out_igmp; | |
d4beaa66 G |
2718 | pde = proc_create("mcfilter", S_IRUGO, net->proc_net, |
2719 | &igmp_mcf_seq_fops); | |
7091e728 AD |
2720 | if (!pde) |
2721 | goto out_mcfilter; | |
1da177e4 | 2722 | return 0; |
7091e728 AD |
2723 | |
2724 | out_mcfilter: | |
ece31ffd | 2725 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
2726 | out_igmp: |
2727 | return -ENOMEM; | |
2728 | } | |
2729 | ||
2c8c1e72 | 2730 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 2731 | { |
ece31ffd G |
2732 | remove_proc_entry("mcfilter", net->proc_net); |
2733 | remove_proc_entry("igmp", net->proc_net); | |
7091e728 AD |
2734 | } |
2735 | ||
2736 | static struct pernet_operations igmp_net_ops = { | |
2737 | .init = igmp_net_init, | |
2738 | .exit = igmp_net_exit, | |
2739 | }; | |
2740 | ||
4aa5dee4 JP |
2741 | static int igmp_netdev_event(struct notifier_block *this, |
2742 | unsigned long event, void *ptr) | |
2743 | { | |
2744 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
2745 | struct in_device *in_dev; | |
2746 | ||
2747 | switch (event) { | |
2748 | case NETDEV_RESEND_IGMP: | |
2749 | in_dev = __in_dev_get_rtnl(dev); | |
2750 | if (in_dev) | |
2751 | ip_mc_rejoin_groups(in_dev); | |
2752 | break; | |
2753 | default: | |
2754 | break; | |
2755 | } | |
2756 | return NOTIFY_DONE; | |
2757 | } | |
2758 | ||
2759 | static struct notifier_block igmp_notifier = { | |
2760 | .notifier_call = igmp_netdev_event, | |
2761 | }; | |
2762 | ||
7091e728 AD |
2763 | int __init igmp_mc_proc_init(void) |
2764 | { | |
4aa5dee4 JP |
2765 | int err; |
2766 | ||
2767 | err = register_pernet_subsys(&igmp_net_ops); | |
2768 | if (err) | |
2769 | return err; | |
2770 | err = register_netdevice_notifier(&igmp_notifier); | |
2771 | if (err) | |
2772 | goto reg_notif_fail; | |
2773 | return 0; | |
2774 | ||
2775 | reg_notif_fail: | |
2776 | unregister_pernet_subsys(&igmp_net_ops); | |
2777 | return err; | |
1da177e4 LT |
2778 | } |
2779 | #endif |