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> | |
93a714d6 | 100 | #include <net/inet_common.h> |
1da177e4 LT |
101 | #include <linux/netfilter_ipv4.h> |
102 | #ifdef CONFIG_IP_MROUTE | |
103 | #include <linux/mroute.h> | |
104 | #endif | |
105 | #ifdef CONFIG_PROC_FS | |
106 | #include <linux/proc_fs.h> | |
107 | #include <linux/seq_file.h> | |
108 | #endif | |
109 | ||
110 | #define IP_MAX_MEMBERSHIPS 20 | |
111 | #define IP_MAX_MSF 10 | |
112 | ||
df2cf4a7 PD |
113 | /* IGMP reports for link-local multicast groups are enabled by default */ |
114 | int sysctl_igmp_llm_reports __read_mostly = 1; | |
115 | ||
1da177e4 LT |
116 | #ifdef CONFIG_IP_MULTICAST |
117 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
118 | ||
436f7c20 FF |
119 | #define IGMP_V1_ROUTER_PRESENT_TIMEOUT (400*HZ) |
120 | #define IGMP_V2_ROUTER_PRESENT_TIMEOUT (400*HZ) | |
121 | #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) | |
122 | #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) | |
123 | #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) | |
124 | #define IGMP_QUERY_ROBUSTNESS_VARIABLE 2 | |
1da177e4 LT |
125 | |
126 | ||
436f7c20 | 127 | #define IGMP_INITIAL_REPORT_DELAY (1) |
1da177e4 | 128 | |
436f7c20 | 129 | /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! |
1da177e4 LT |
130 | * IGMP specs require to report membership immediately after |
131 | * joining a group, but we delay the first report by a | |
132 | * small interval. It seems more natural and still does not | |
133 | * contradict to specs provided this delay is small enough. | |
134 | */ | |
135 | ||
42f811b8 | 136 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 137 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
138 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
139 | ((in_dev)->mr_v1_seen && \ | |
140 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
141 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 142 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
143 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
144 | ((in_dev)->mr_v2_seen && \ | |
145 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 | 146 | |
cab70040 WM |
147 | static int unsolicited_report_interval(struct in_device *in_dev) |
148 | { | |
2690048c WM |
149 | int interval_ms, interval_jiffies; |
150 | ||
cab70040 | 151 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
2690048c WM |
152 | interval_ms = IN_DEV_CONF_GET( |
153 | in_dev, | |
154 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
cab70040 | 155 | else /* v3 */ |
2690048c WM |
156 | interval_ms = IN_DEV_CONF_GET( |
157 | in_dev, | |
158 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
159 | ||
160 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
161 | ||
162 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
163 | * we always return a positive value. | |
164 | */ | |
165 | if (interval_jiffies <= 0) | |
166 | interval_jiffies = 1; | |
167 | return interval_jiffies; | |
cab70040 WM |
168 | } |
169 | ||
1da177e4 | 170 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
63007727 | 171 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); |
1da177e4 LT |
172 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
173 | static int sf_setstate(struct ip_mc_list *pmc); | |
174 | static void sf_markstate(struct ip_mc_list *pmc); | |
175 | #endif | |
176 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
177 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
178 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
179 | |
180 | static void ip_ma_put(struct ip_mc_list *im) | |
181 | { | |
182 | if (atomic_dec_and_test(&im->refcnt)) { | |
183 | in_dev_put(im->interface); | |
42ea299d | 184 | kfree_rcu(im, rcu); |
1da177e4 LT |
185 | } |
186 | } | |
187 | ||
d9aa9380 DM |
188 | #define for_each_pmc_rcu(in_dev, pmc) \ |
189 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
190 | pmc != NULL; \ | |
191 | pmc = rcu_dereference(pmc->next_rcu)) | |
192 | ||
193 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
194 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
195 | pmc != NULL; \ | |
196 | pmc = rtnl_dereference(pmc->next_rcu)) | |
197 | ||
1da177e4 LT |
198 | #ifdef CONFIG_IP_MULTICAST |
199 | ||
200 | /* | |
201 | * Timer management | |
202 | */ | |
203 | ||
1d7138de | 204 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
205 | { |
206 | spin_lock_bh(&im->lock); | |
207 | if (del_timer(&im->timer)) | |
208 | atomic_dec(&im->refcnt); | |
a7e9ff73 | 209 | im->tm_running = 0; |
1da177e4 LT |
210 | im->reporter = 0; |
211 | im->unsolicit_count = 0; | |
212 | spin_unlock_bh(&im->lock); | |
213 | } | |
214 | ||
215 | /* It must be called with locked im->lock */ | |
216 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
217 | { | |
63862b5b | 218 | int tv = prandom_u32() % max_delay; |
1da177e4 | 219 | |
a7e9ff73 | 220 | im->tm_running = 1; |
1da177e4 LT |
221 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
222 | atomic_inc(&im->refcnt); | |
223 | } | |
224 | ||
225 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
226 | { | |
63862b5b | 227 | int tv = prandom_u32() % in_dev->mr_maxdelay; |
0d431f94 MT |
228 | unsigned long exp = jiffies + tv + 2; |
229 | ||
230 | if (in_dev->mr_gq_running && | |
231 | time_after_eq(exp, (in_dev->mr_gq_timer).expires)) | |
232 | return; | |
1da177e4 LT |
233 | |
234 | in_dev->mr_gq_running = 1; | |
0d431f94 | 235 | if (!mod_timer(&in_dev->mr_gq_timer, exp)) |
1da177e4 LT |
236 | in_dev_hold(in_dev); |
237 | } | |
238 | ||
239 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
240 | { | |
63862b5b | 241 | int tv = prandom_u32() % delay; |
1da177e4 LT |
242 | |
243 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
244 | in_dev_hold(in_dev); | |
245 | } | |
246 | ||
247 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
248 | { | |
249 | spin_lock_bh(&im->lock); | |
250 | im->unsolicit_count = 0; | |
251 | if (del_timer(&im->timer)) { | |
252 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
253 | add_timer(&im->timer); | |
a7e9ff73 | 254 | im->tm_running = 1; |
1da177e4 LT |
255 | spin_unlock_bh(&im->lock); |
256 | return; | |
257 | } | |
258 | atomic_dec(&im->refcnt); | |
259 | } | |
260 | igmp_start_timer(im, max_delay); | |
261 | spin_unlock_bh(&im->lock); | |
262 | } | |
263 | ||
264 | ||
265 | /* | |
266 | * Send an IGMP report. | |
267 | */ | |
268 | ||
269 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
270 | ||
271 | ||
272 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
273 | int gdeleted, int sdeleted) | |
274 | { | |
275 | switch (type) { | |
276 | case IGMPV3_MODE_IS_INCLUDE: | |
277 | case IGMPV3_MODE_IS_EXCLUDE: | |
278 | if (gdeleted || sdeleted) | |
279 | return 0; | |
ad12583f DS |
280 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
281 | if (pmc->sfmode == MCAST_INCLUDE) | |
282 | return 1; | |
283 | /* don't include if this source is excluded | |
284 | * in all filters | |
285 | */ | |
286 | if (psf->sf_count[MCAST_INCLUDE]) | |
287 | return type == IGMPV3_MODE_IS_INCLUDE; | |
288 | return pmc->sfcount[MCAST_EXCLUDE] == | |
289 | psf->sf_count[MCAST_EXCLUDE]; | |
290 | } | |
291 | return 0; | |
1da177e4 LT |
292 | case IGMPV3_CHANGE_TO_INCLUDE: |
293 | if (gdeleted || sdeleted) | |
294 | return 0; | |
295 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
296 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
297 | if (gdeleted || sdeleted) | |
298 | return 0; | |
299 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
300 | psf->sf_count[MCAST_INCLUDE]) | |
301 | return 0; | |
302 | return pmc->sfcount[MCAST_EXCLUDE] == | |
303 | psf->sf_count[MCAST_EXCLUDE]; | |
304 | case IGMPV3_ALLOW_NEW_SOURCES: | |
305 | if (gdeleted || !psf->sf_crcount) | |
306 | return 0; | |
307 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
308 | case IGMPV3_BLOCK_OLD_SOURCES: | |
309 | if (pmc->sfmode == MCAST_INCLUDE) | |
310 | return gdeleted || (psf->sf_crcount && sdeleted); | |
311 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
312 | } | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static int | |
317 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
318 | { | |
319 | struct ip_sf_list *psf; | |
320 | int scount = 0; | |
321 | ||
c71151f0 | 322 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
323 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
324 | continue; | |
325 | scount++; | |
326 | } | |
327 | return scount; | |
328 | } | |
329 | ||
4c672e4b | 330 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
1da177e4 LT |
331 | { |
332 | struct sk_buff *skb; | |
333 | struct rtable *rt; | |
334 | struct iphdr *pip; | |
335 | struct igmpv3_report *pig; | |
877acedc | 336 | struct net *net = dev_net(dev); |
31e4543d | 337 | struct flowi4 fl4; |
66088243 HX |
338 | int hlen = LL_RESERVED_SPACE(dev); |
339 | int tlen = dev->needed_tailroom; | |
4c672e4b | 340 | unsigned int size = mtu; |
1da177e4 | 341 | |
57e1ab6e | 342 | while (1) { |
66088243 | 343 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
344 | GFP_ATOMIC | __GFP_NOWARN); |
345 | if (skb) | |
346 | break; | |
347 | size >>= 1; | |
348 | if (size < 256) | |
349 | return NULL; | |
350 | } | |
9d4a0314 | 351 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 352 | |
31e4543d | 353 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
354 | 0, 0, |
355 | IPPROTO_IGMP, 0, dev->ifindex); | |
356 | if (IS_ERR(rt)) { | |
357 | kfree_skb(skb); | |
358 | return NULL; | |
1da177e4 | 359 | } |
1da177e4 | 360 | |
d8d1f30b | 361 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
362 | skb->dev = dev; |
363 | ||
66088243 | 364 | skb_reserve(skb, hlen); |
d9bbdcd8 | 365 | skb_tailroom_reserve(skb, mtu, tlen); |
1da177e4 | 366 | |
7e28ecc2 | 367 | skb_reset_network_header(skb); |
eddc9ec5 | 368 | pip = ip_hdr(skb); |
7e28ecc2 | 369 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
370 | |
371 | pip->version = 4; | |
372 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
373 | pip->tos = 0xc0; | |
374 | pip->frag_off = htons(IP_DF); | |
375 | pip->ttl = 1; | |
492f64ce DM |
376 | pip->daddr = fl4.daddr; |
377 | pip->saddr = fl4.saddr; | |
1da177e4 LT |
378 | pip->protocol = IPPROTO_IGMP; |
379 | pip->tot_len = 0; /* filled in later */ | |
b6a7719a | 380 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
381 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
382 | ((u8 *)&pip[1])[1] = 4; | |
383 | ((u8 *)&pip[1])[2] = 0; | |
384 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 385 | |
b0e380b1 | 386 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 387 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 388 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
389 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
390 | pig->resv1 = 0; | |
391 | pig->csum = 0; | |
392 | pig->resv2 = 0; | |
393 | pig->ngrec = 0; | |
394 | return skb; | |
395 | } | |
396 | ||
397 | static int igmpv3_sendpack(struct sk_buff *skb) | |
398 | { | |
d9edf9e2 | 399 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 400 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 401 | |
d9edf9e2 | 402 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 403 | |
33224b16 | 404 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
1da177e4 LT |
405 | } |
406 | ||
407 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
408 | { | |
a7e9ff73 | 409 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
410 | } |
411 | ||
412 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
413 | int type, struct igmpv3_grec **ppgr) | |
414 | { | |
415 | struct net_device *dev = pmc->interface->dev; | |
416 | struct igmpv3_report *pih; | |
417 | struct igmpv3_grec *pgr; | |
418 | ||
419 | if (!skb) | |
420 | skb = igmpv3_newpack(dev, dev->mtu); | |
421 | if (!skb) | |
422 | return NULL; | |
423 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
424 | pgr->grec_type = type; | |
425 | pgr->grec_auxwords = 0; | |
426 | pgr->grec_nsrcs = 0; | |
427 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 428 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
429 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
430 | *ppgr = pgr; | |
431 | return skb; | |
432 | } | |
433 | ||
4c672e4b | 434 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
435 | |
436 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
437 | int type, int gdeleted, int sdeleted) | |
438 | { | |
439 | struct net_device *dev = pmc->interface->dev; | |
440 | struct igmpv3_report *pih; | |
441 | struct igmpv3_grec *pgr = NULL; | |
442 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 443 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
444 | |
445 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
446 | return skb; | |
df2cf4a7 PD |
447 | if (ipv4_is_local_multicast(pmc->multiaddr) && !sysctl_igmp_llm_reports) |
448 | return skb; | |
1da177e4 LT |
449 | |
450 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
451 | type == IGMPV3_MODE_IS_EXCLUDE; | |
452 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
453 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
454 | ||
ad12583f DS |
455 | stotal = scount = 0; |
456 | ||
1da177e4 LT |
457 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
458 | ||
ad12583f DS |
459 | if (!*psf_list) |
460 | goto empty_source; | |
461 | ||
d9edf9e2 | 462 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
463 | |
464 | /* EX and TO_EX get a fresh packet, if needed */ | |
465 | if (truncate) { | |
466 | if (pih && pih->ngrec && | |
467 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
468 | if (skb) | |
469 | igmpv3_sendpack(skb); | |
470 | skb = igmpv3_newpack(dev, dev->mtu); | |
471 | } | |
472 | } | |
473 | first = 1; | |
1da177e4 | 474 | psf_prev = NULL; |
c71151f0 | 475 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 476 | __be32 *psrc; |
1da177e4 LT |
477 | |
478 | psf_next = psf->sf_next; | |
479 | ||
480 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
481 | psf_prev = psf; | |
482 | continue; | |
483 | } | |
484 | ||
485 | /* clear marks on query responses */ | |
486 | if (isquery) | |
487 | psf->sf_gsresp = 0; | |
488 | ||
63007727 | 489 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
490 | first*sizeof(struct igmpv3_grec)) { |
491 | if (truncate && !first) | |
492 | break; /* truncate these */ | |
493 | if (pgr) | |
494 | pgr->grec_nsrcs = htons(scount); | |
495 | if (skb) | |
496 | igmpv3_sendpack(skb); | |
497 | skb = igmpv3_newpack(dev, dev->mtu); | |
498 | first = 1; | |
499 | scount = 0; | |
500 | } | |
501 | if (first) { | |
502 | skb = add_grhead(skb, pmc, type, &pgr); | |
503 | first = 0; | |
504 | } | |
cc63f70b AD |
505 | if (!skb) |
506 | return NULL; | |
63007727 | 507 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 508 | *psrc = psf->sf_inaddr; |
ad12583f | 509 | scount++; stotal++; |
1da177e4 LT |
510 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
511 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
512 | psf->sf_crcount--; | |
513 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
514 | if (psf_prev) | |
515 | psf_prev->sf_next = psf->sf_next; | |
516 | else | |
517 | *psf_list = psf->sf_next; | |
518 | kfree(psf); | |
519 | continue; | |
520 | } | |
521 | } | |
522 | psf_prev = psf; | |
523 | } | |
ad12583f DS |
524 | |
525 | empty_source: | |
526 | if (!stotal) { | |
527 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
528 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
529 | return skb; | |
530 | if (pmc->crcount || isquery) { | |
531 | /* make sure we have room for group header */ | |
c71151f0 | 532 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
533 | igmpv3_sendpack(skb); |
534 | skb = NULL; /* add_grhead will get a new one */ | |
535 | } | |
536 | skb = add_grhead(skb, pmc, type, &pgr); | |
537 | } | |
538 | } | |
1da177e4 LT |
539 | if (pgr) |
540 | pgr->grec_nsrcs = htons(scount); | |
541 | ||
542 | if (isquery) | |
543 | pmc->gsquery = 0; /* clear query state on report */ | |
544 | return skb; | |
545 | } | |
546 | ||
547 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
548 | { | |
549 | struct sk_buff *skb = NULL; | |
550 | int type; | |
551 | ||
552 | if (!pmc) { | |
1d7138de ED |
553 | rcu_read_lock(); |
554 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
555 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
556 | continue; | |
df2cf4a7 PD |
557 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
558 | !sysctl_igmp_llm_reports) | |
559 | continue; | |
1da177e4 LT |
560 | spin_lock_bh(&pmc->lock); |
561 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
562 | type = IGMPV3_MODE_IS_EXCLUDE; | |
563 | else | |
564 | type = IGMPV3_MODE_IS_INCLUDE; | |
565 | skb = add_grec(skb, pmc, type, 0, 0); | |
566 | spin_unlock_bh(&pmc->lock); | |
567 | } | |
1d7138de | 568 | rcu_read_unlock(); |
1da177e4 LT |
569 | } else { |
570 | spin_lock_bh(&pmc->lock); | |
571 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
572 | type = IGMPV3_MODE_IS_EXCLUDE; | |
573 | else | |
574 | type = IGMPV3_MODE_IS_INCLUDE; | |
575 | skb = add_grec(skb, pmc, type, 0, 0); | |
576 | spin_unlock_bh(&pmc->lock); | |
577 | } | |
578 | if (!skb) | |
579 | return 0; | |
580 | return igmpv3_sendpack(skb); | |
581 | } | |
582 | ||
583 | /* | |
584 | * remove zero-count source records from a source filter list | |
585 | */ | |
586 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
587 | { | |
588 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
589 | ||
590 | psf_prev = NULL; | |
c71151f0 | 591 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
592 | psf_next = psf->sf_next; |
593 | if (psf->sf_crcount == 0) { | |
594 | if (psf_prev) | |
595 | psf_prev->sf_next = psf->sf_next; | |
596 | else | |
597 | *ppsf = psf->sf_next; | |
598 | kfree(psf); | |
599 | } else | |
600 | psf_prev = psf; | |
601 | } | |
602 | } | |
603 | ||
604 | static void igmpv3_send_cr(struct in_device *in_dev) | |
605 | { | |
606 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
607 | struct sk_buff *skb = NULL; | |
608 | int type, dtype; | |
609 | ||
1d7138de | 610 | rcu_read_lock(); |
1da177e4 LT |
611 | spin_lock_bh(&in_dev->mc_tomb_lock); |
612 | ||
613 | /* deleted MCA's */ | |
614 | pmc_prev = NULL; | |
c71151f0 | 615 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
616 | pmc_next = pmc->next; |
617 | if (pmc->sfmode == MCAST_INCLUDE) { | |
618 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
619 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
620 | skb = add_grec(skb, pmc, type, 1, 0); | |
621 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
622 | } | |
623 | if (pmc->crcount) { | |
1da177e4 LT |
624 | if (pmc->sfmode == MCAST_EXCLUDE) { |
625 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
626 | skb = add_grec(skb, pmc, type, 1, 0); | |
627 | } | |
ad12583f | 628 | pmc->crcount--; |
1da177e4 LT |
629 | if (pmc->crcount == 0) { |
630 | igmpv3_clear_zeros(&pmc->tomb); | |
631 | igmpv3_clear_zeros(&pmc->sources); | |
632 | } | |
633 | } | |
634 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
635 | if (pmc_prev) | |
636 | pmc_prev->next = pmc_next; | |
637 | else | |
638 | in_dev->mc_tomb = pmc_next; | |
639 | in_dev_put(pmc->interface); | |
640 | kfree(pmc); | |
641 | } else | |
642 | pmc_prev = pmc; | |
643 | } | |
644 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
645 | ||
646 | /* change recs */ | |
1d7138de | 647 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
648 | spin_lock_bh(&pmc->lock); |
649 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
650 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
651 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
652 | } else { | |
653 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
654 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
655 | } | |
656 | skb = add_grec(skb, pmc, type, 0, 0); | |
657 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
658 | ||
659 | /* filter mode changes */ | |
660 | if (pmc->crcount) { | |
1da177e4 LT |
661 | if (pmc->sfmode == MCAST_EXCLUDE) |
662 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
663 | else | |
664 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
665 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 666 | pmc->crcount--; |
1da177e4 LT |
667 | } |
668 | spin_unlock_bh(&pmc->lock); | |
669 | } | |
1d7138de | 670 | rcu_read_unlock(); |
1da177e4 LT |
671 | |
672 | if (!skb) | |
673 | return; | |
674 | (void) igmpv3_sendpack(skb); | |
675 | } | |
676 | ||
677 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
678 | int type) | |
679 | { | |
680 | struct sk_buff *skb; | |
681 | struct iphdr *iph; | |
682 | struct igmphdr *ih; | |
683 | struct rtable *rt; | |
684 | struct net_device *dev = in_dev->dev; | |
877acedc | 685 | struct net *net = dev_net(dev); |
63007727 | 686 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 687 | struct flowi4 fl4; |
63007727 | 688 | __be32 dst; |
66088243 | 689 | int hlen, tlen; |
1da177e4 LT |
690 | |
691 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
692 | return igmpv3_send_report(in_dev, pmc); | |
df2cf4a7 PD |
693 | |
694 | if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports) | |
695 | return 0; | |
696 | ||
697 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
1da177e4 LT |
698 | dst = IGMP_ALL_ROUTER; |
699 | else | |
700 | dst = group; | |
701 | ||
31e4543d | 702 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
703 | 0, 0, |
704 | IPPROTO_IGMP, 0, dev->ifindex); | |
705 | if (IS_ERR(rt)) | |
706 | return -1; | |
707 | ||
66088243 HX |
708 | hlen = LL_RESERVED_SPACE(dev); |
709 | tlen = dev->needed_tailroom; | |
710 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
51456b29 | 711 | if (!skb) { |
1da177e4 LT |
712 | ip_rt_put(rt); |
713 | return -1; | |
714 | } | |
9d4a0314 | 715 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 716 | |
d8d1f30b | 717 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 718 | |
66088243 | 719 | skb_reserve(skb, hlen); |
1da177e4 | 720 | |
7e28ecc2 | 721 | skb_reset_network_header(skb); |
eddc9ec5 | 722 | iph = ip_hdr(skb); |
7e28ecc2 | 723 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
724 | |
725 | iph->version = 4; | |
726 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
727 | iph->tos = 0xc0; | |
728 | iph->frag_off = htons(IP_DF); | |
729 | iph->ttl = 1; | |
730 | iph->daddr = dst; | |
492f64ce | 731 | iph->saddr = fl4.saddr; |
1da177e4 | 732 | iph->protocol = IPPROTO_IGMP; |
b6a7719a | 733 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
734 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
735 | ((u8 *)&iph[1])[1] = 4; | |
736 | ((u8 *)&iph[1])[2] = 0; | |
737 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 LT |
738 | |
739 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
740 | ih->type = type; |
741 | ih->code = 0; | |
742 | ih->csum = 0; | |
743 | ih->group = group; | |
744 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 745 | |
33224b16 | 746 | return ip_local_out(net, skb->sk, skb); |
1da177e4 LT |
747 | } |
748 | ||
749 | static void igmp_gq_timer_expire(unsigned long data) | |
750 | { | |
751 | struct in_device *in_dev = (struct in_device *)data; | |
752 | ||
753 | in_dev->mr_gq_running = 0; | |
754 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 755 | in_dev_put(in_dev); |
1da177e4 LT |
756 | } |
757 | ||
758 | static void igmp_ifc_timer_expire(unsigned long data) | |
759 | { | |
760 | struct in_device *in_dev = (struct in_device *)data; | |
761 | ||
762 | igmpv3_send_cr(in_dev); | |
763 | if (in_dev->mr_ifc_count) { | |
764 | in_dev->mr_ifc_count--; | |
cab70040 WM |
765 | igmp_ifc_start_timer(in_dev, |
766 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 767 | } |
e2401654 | 768 | in_dev_put(in_dev); |
1da177e4 LT |
769 | } |
770 | ||
771 | static void igmp_ifc_event(struct in_device *in_dev) | |
772 | { | |
773 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
774 | return; | |
a9fe8e29 | 775 | in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
776 | igmp_ifc_start_timer(in_dev, 1); |
777 | } | |
778 | ||
779 | ||
780 | static void igmp_timer_expire(unsigned long data) | |
781 | { | |
c71151f0 | 782 | struct ip_mc_list *im = (struct ip_mc_list *)data; |
1da177e4 LT |
783 | struct in_device *in_dev = im->interface; |
784 | ||
785 | spin_lock(&im->lock); | |
a7e9ff73 | 786 | im->tm_running = 0; |
1da177e4 LT |
787 | |
788 | if (im->unsolicit_count) { | |
789 | im->unsolicit_count--; | |
cab70040 | 790 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
1da177e4 LT |
791 | } |
792 | im->reporter = 1; | |
793 | spin_unlock(&im->lock); | |
794 | ||
795 | if (IGMP_V1_SEEN(in_dev)) | |
796 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
797 | else if (IGMP_V2_SEEN(in_dev)) | |
798 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
799 | else | |
800 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
801 | ||
802 | ip_ma_put(im); | |
803 | } | |
804 | ||
ad12583f | 805 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 806 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
807 | { |
808 | struct ip_sf_list *psf; | |
809 | int i, scount; | |
810 | ||
ad12583f | 811 | scount = 0; |
c71151f0 | 812 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
813 | if (scount == nsrcs) |
814 | break; | |
c71151f0 | 815 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 816 | /* skip inactive filters */ |
e05c4ad3 | 817 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
818 | pmc->sfcount[MCAST_EXCLUDE] != |
819 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 820 | break; |
ad12583f DS |
821 | if (srcs[i] == psf->sf_inaddr) { |
822 | scount++; | |
823 | break; | |
824 | } | |
825 | } | |
826 | } | |
827 | pmc->gsquery = 0; | |
828 | if (scount == nsrcs) /* all sources excluded */ | |
829 | return 0; | |
830 | return 1; | |
831 | } | |
832 | ||
ea4d9e72 | 833 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
834 | { |
835 | struct ip_sf_list *psf; | |
836 | int i, scount; | |
837 | ||
838 | if (pmc->sfmode == MCAST_EXCLUDE) | |
839 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
840 | ||
841 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 842 | scount = 0; |
c71151f0 | 843 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
844 | if (scount == nsrcs) |
845 | break; | |
c71151f0 | 846 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
847 | if (srcs[i] == psf->sf_inaddr) { |
848 | psf->sf_gsresp = 1; | |
849 | scount++; | |
850 | break; | |
851 | } | |
852 | } | |
ad12583f DS |
853 | if (!scount) { |
854 | pmc->gsquery = 0; | |
855 | return 0; | |
856 | } | |
857 | pmc->gsquery = 1; | |
858 | return 1; | |
1da177e4 LT |
859 | } |
860 | ||
d679c532 ED |
861 | /* return true if packet was dropped */ |
862 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
863 | { |
864 | struct ip_mc_list *im; | |
865 | ||
866 | /* Timers are only set for non-local groups */ | |
867 | ||
868 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 869 | return false; |
df2cf4a7 PD |
870 | if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports) |
871 | return false; | |
1da177e4 | 872 | |
1d7138de ED |
873 | rcu_read_lock(); |
874 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
875 | if (im->multiaddr == group) { |
876 | igmp_stop_timer(im); | |
877 | break; | |
878 | } | |
879 | } | |
1d7138de | 880 | rcu_read_unlock(); |
d679c532 | 881 | return false; |
1da177e4 LT |
882 | } |
883 | ||
d679c532 ED |
884 | /* return true if packet was dropped */ |
885 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
886 | int len) |
887 | { | |
d9edf9e2 ACM |
888 | struct igmphdr *ih = igmp_hdr(skb); |
889 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 890 | struct ip_mc_list *im; |
63007727 | 891 | __be32 group = ih->group; |
1da177e4 LT |
892 | int max_delay; |
893 | int mark = 0; | |
894 | ||
895 | ||
5b7c8406 | 896 | if (len == 8) { |
1da177e4 LT |
897 | if (ih->code == 0) { |
898 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 899 | |
436f7c20 | 900 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
1da177e4 | 901 | in_dev->mr_v1_seen = jiffies + |
436f7c20 | 902 | IGMP_V1_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
903 | group = 0; |
904 | } else { | |
905 | /* v2 router present */ | |
906 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
907 | in_dev->mr_v2_seen = jiffies + | |
436f7c20 | 908 | IGMP_V2_ROUTER_PRESENT_TIMEOUT; |
1da177e4 LT |
909 | } |
910 | /* cancel the interface change timer */ | |
911 | in_dev->mr_ifc_count = 0; | |
912 | if (del_timer(&in_dev->mr_ifc_timer)) | |
913 | __in_dev_put(in_dev); | |
914 | /* clear deleted report items */ | |
915 | igmpv3_clear_delrec(in_dev); | |
916 | } else if (len < 12) { | |
d679c532 | 917 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
918 | } else if (IGMP_V1_SEEN(in_dev)) { |
919 | /* This is a v3 query with v1 queriers present */ | |
436f7c20 | 920 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
5b7c8406 DS |
921 | group = 0; |
922 | } else if (IGMP_V2_SEEN(in_dev)) { | |
923 | /* this is a v3 query with v2 queriers present; | |
924 | * Interpretation of the max_delay code is problematic here. | |
925 | * A real v2 host would use ih_code directly, while v3 has a | |
926 | * different encoding. We use the v3 encoding as more likely | |
927 | * to be intended in a v3 query. | |
928 | */ | |
929 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
930 | if (!max_delay) |
931 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
932 | } else { /* v3 */ |
933 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 934 | return true; |
e905a9ed | 935 | |
d9edf9e2 | 936 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 937 | if (ih3->nsrcs) { |
e905a9ed | 938 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 939 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 940 | return true; |
d9edf9e2 | 941 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
942 | } |
943 | ||
944 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
945 | if (!max_delay) | |
946 | max_delay = 1; /* can't mod w/ 0 */ | |
947 | in_dev->mr_maxdelay = max_delay; | |
948 | if (ih3->qrv) | |
949 | in_dev->mr_qrv = ih3->qrv; | |
950 | if (!group) { /* general query */ | |
951 | if (ih3->nsrcs) | |
b47bd8d2 | 952 | return true; /* no sources allowed */ |
1da177e4 | 953 | igmp_gq_start_timer(in_dev); |
d679c532 | 954 | return false; |
1da177e4 LT |
955 | } |
956 | /* mark sources to include, if group & source-specific */ | |
957 | mark = ih3->nsrcs != 0; | |
958 | } | |
959 | ||
960 | /* | |
961 | * - Start the timers in all of our membership records | |
962 | * that the query applies to for the interface on | |
963 | * which the query arrived excl. those that belong | |
964 | * to a "local" group (224.0.0.X) | |
965 | * - For timers already running check if they need to | |
966 | * be reset. | |
967 | * - Use the igmp->igmp_code field as the maximum | |
968 | * delay possible | |
969 | */ | |
1d7138de ED |
970 | rcu_read_lock(); |
971 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
972 | int changed; |
973 | ||
1da177e4 LT |
974 | if (group && group != im->multiaddr) |
975 | continue; | |
976 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
977 | continue; | |
df2cf4a7 PD |
978 | if (ipv4_is_local_multicast(im->multiaddr) && |
979 | !sysctl_igmp_llm_reports) | |
980 | continue; | |
1da177e4 LT |
981 | spin_lock_bh(&im->lock); |
982 | if (im->tm_running) | |
983 | im->gsquery = im->gsquery && mark; | |
984 | else | |
985 | im->gsquery = mark; | |
ad12583f | 986 | changed = !im->gsquery || |
e905a9ed | 987 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 988 | spin_unlock_bh(&im->lock); |
ad12583f DS |
989 | if (changed) |
990 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 991 | } |
1d7138de | 992 | rcu_read_unlock(); |
d679c532 | 993 | return false; |
1da177e4 LT |
994 | } |
995 | ||
9a57a9d2 | 996 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
997 | int igmp_rcv(struct sk_buff *skb) |
998 | { | |
999 | /* This basically follows the spec line by line -- see RFC1112 */ | |
1000 | struct igmphdr *ih; | |
9a57a9d2 | 1001 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 | 1002 | int len = skb->len; |
d679c532 | 1003 | bool dropped = true; |
1da177e4 | 1004 | |
51456b29 | 1005 | if (!in_dev) |
cd557bc1 | 1006 | goto drop; |
1da177e4 | 1007 | |
fb286bb2 | 1008 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 1009 | goto drop; |
fb286bb2 | 1010 | |
de08dc1a TH |
1011 | if (skb_checksum_simple_validate(skb)) |
1012 | goto drop; | |
1da177e4 | 1013 | |
d9edf9e2 | 1014 | ih = igmp_hdr(skb); |
1da177e4 LT |
1015 | switch (ih->type) { |
1016 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 1017 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
1018 | break; |
1019 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1020 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 1021 | /* Is it our report looped back? */ |
c7537967 | 1022 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1023 | break; |
24c69275 DS |
1024 | /* don't rely on MC router hearing unicast reports */ |
1025 | if (skb->pkt_type == PACKET_MULTICAST || | |
1026 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1027 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1028 | break; |
1029 | case IGMP_PIM: | |
1030 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1031 | return pim_rcv_v1(skb); |
1032 | #endif | |
c6b471e6 | 1033 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1034 | case IGMP_DVMRP: |
1035 | case IGMP_TRACE: | |
1036 | case IGMP_HOST_LEAVE_MESSAGE: | |
1037 | case IGMP_MTRACE: | |
1038 | case IGMP_MTRACE_RESP: | |
1039 | break; | |
1040 | default: | |
dd1c1853 | 1041 | break; |
1da177e4 | 1042 | } |
fb286bb2 | 1043 | |
cd557bc1 | 1044 | drop: |
d679c532 ED |
1045 | if (dropped) |
1046 | kfree_skb(skb); | |
1047 | else | |
1048 | consume_skb(skb); | |
1da177e4 LT |
1049 | return 0; |
1050 | } | |
1051 | ||
1052 | #endif | |
1053 | ||
1054 | ||
1055 | /* | |
1056 | * Add a filter to a device | |
1057 | */ | |
1058 | ||
63007727 | 1059 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1060 | { |
1061 | char buf[MAX_ADDR_LEN]; | |
1062 | struct net_device *dev = in_dev->dev; | |
1063 | ||
1064 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1065 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1066 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1067 | routine. Something sort of: |
1068 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1069 | --ANK | |
1070 | */ | |
1071 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1072 | dev_mc_add(dev, buf); |
1da177e4 LT |
1073 | } |
1074 | ||
1075 | /* | |
1076 | * Remove a filter from a device | |
1077 | */ | |
1078 | ||
63007727 | 1079 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1080 | { |
1081 | char buf[MAX_ADDR_LEN]; | |
1082 | struct net_device *dev = in_dev->dev; | |
1083 | ||
1084 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1085 | dev_mc_del(dev, buf); |
1da177e4 LT |
1086 | } |
1087 | ||
1088 | #ifdef CONFIG_IP_MULTICAST | |
1089 | /* | |
1090 | * deleted ip_mc_list manipulation | |
1091 | */ | |
1092 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1093 | { | |
1094 | struct ip_mc_list *pmc; | |
1095 | ||
1096 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1097 | * are actually used. In particular, the refcnt and users are not | |
1098 | * used for management of the delete list. Using the same structure | |
1099 | * for deleted items allows change reports to use common code with | |
1100 | * non-deleted or query-response MCA's. | |
1101 | */ | |
0da974f4 | 1102 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1103 | if (!pmc) |
1104 | return; | |
4feb6121 | 1105 | spin_lock_init(&pmc->lock); |
1da177e4 LT |
1106 | spin_lock_bh(&im->lock); |
1107 | pmc->interface = im->interface; | |
1108 | in_dev_hold(in_dev); | |
1109 | pmc->multiaddr = im->multiaddr; | |
a9fe8e29 | 1110 | pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
1111 | pmc->sfmode = im->sfmode; |
1112 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1113 | struct ip_sf_list *psf; | |
1114 | ||
1115 | pmc->tomb = im->tomb; | |
1116 | pmc->sources = im->sources; | |
1117 | im->tomb = im->sources = NULL; | |
c71151f0 | 1118 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1119 | psf->sf_crcount = pmc->crcount; |
1120 | } | |
1121 | spin_unlock_bh(&im->lock); | |
1122 | ||
1123 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1124 | pmc->next = in_dev->mc_tomb; | |
1125 | in_dev->mc_tomb = pmc; | |
1126 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1127 | } | |
1128 | ||
63007727 | 1129 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1130 | { |
1131 | struct ip_mc_list *pmc, *pmc_prev; | |
1132 | struct ip_sf_list *psf, *psf_next; | |
1133 | ||
1134 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1135 | pmc_prev = NULL; | |
c71151f0 | 1136 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1137 | if (pmc->multiaddr == multiaddr) |
1138 | break; | |
1139 | pmc_prev = pmc; | |
1140 | } | |
1141 | if (pmc) { | |
1142 | if (pmc_prev) | |
1143 | pmc_prev->next = pmc->next; | |
1144 | else | |
1145 | in_dev->mc_tomb = pmc->next; | |
1146 | } | |
1147 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1148 | if (pmc) { | |
c71151f0 | 1149 | for (psf = pmc->tomb; psf; psf = psf_next) { |
1da177e4 LT |
1150 | psf_next = psf->sf_next; |
1151 | kfree(psf); | |
1152 | } | |
1153 | in_dev_put(pmc->interface); | |
1154 | kfree(pmc); | |
1155 | } | |
1156 | } | |
1157 | ||
1158 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1159 | { | |
1160 | struct ip_mc_list *pmc, *nextpmc; | |
1161 | ||
1162 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1163 | pmc = in_dev->mc_tomb; | |
1164 | in_dev->mc_tomb = NULL; | |
1165 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1166 | ||
1167 | for (; pmc; pmc = nextpmc) { | |
1168 | nextpmc = pmc->next; | |
1169 | ip_mc_clear_src(pmc); | |
1170 | in_dev_put(pmc->interface); | |
1171 | kfree(pmc); | |
1172 | } | |
1173 | /* clear dead sources, too */ | |
1d7138de ED |
1174 | rcu_read_lock(); |
1175 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1176 | struct ip_sf_list *psf, *psf_next; |
1177 | ||
1178 | spin_lock_bh(&pmc->lock); | |
1179 | psf = pmc->tomb; | |
1180 | pmc->tomb = NULL; | |
1181 | spin_unlock_bh(&pmc->lock); | |
c71151f0 | 1182 | for (; psf; psf = psf_next) { |
1da177e4 LT |
1183 | psf_next = psf->sf_next; |
1184 | kfree(psf); | |
1185 | } | |
1186 | } | |
1d7138de | 1187 | rcu_read_unlock(); |
1da177e4 LT |
1188 | } |
1189 | #endif | |
1190 | ||
1191 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1192 | { | |
1193 | struct in_device *in_dev = im->interface; | |
1194 | #ifdef CONFIG_IP_MULTICAST | |
1195 | int reporter; | |
1196 | #endif | |
1197 | ||
1198 | if (im->loaded) { | |
1199 | im->loaded = 0; | |
1200 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1201 | } | |
1202 | ||
1203 | #ifdef CONFIG_IP_MULTICAST | |
1204 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1205 | return; | |
df2cf4a7 PD |
1206 | if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports) |
1207 | return; | |
1da177e4 LT |
1208 | |
1209 | reporter = im->reporter; | |
1210 | igmp_stop_timer(im); | |
1211 | ||
1212 | if (!in_dev->dead) { | |
1213 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1214 | return; |
1da177e4 LT |
1215 | if (IGMP_V2_SEEN(in_dev)) { |
1216 | if (reporter) | |
1217 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1218 | return; |
1da177e4 LT |
1219 | } |
1220 | /* IGMPv3 */ | |
1221 | igmpv3_add_delrec(in_dev, im); | |
1222 | ||
1223 | igmp_ifc_event(in_dev); | |
1224 | } | |
1da177e4 | 1225 | #endif |
1da177e4 LT |
1226 | } |
1227 | ||
1228 | static void igmp_group_added(struct ip_mc_list *im) | |
1229 | { | |
1230 | struct in_device *in_dev = im->interface; | |
1231 | ||
1232 | if (im->loaded == 0) { | |
1233 | im->loaded = 1; | |
1234 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1235 | } | |
1236 | ||
1237 | #ifdef CONFIG_IP_MULTICAST | |
1238 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1239 | return; | |
df2cf4a7 PD |
1240 | if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports) |
1241 | return; | |
1da177e4 LT |
1242 | |
1243 | if (in_dev->dead) | |
1244 | return; | |
1245 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1246 | spin_lock_bh(&im->lock); | |
436f7c20 | 1247 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); |
1da177e4 LT |
1248 | spin_unlock_bh(&im->lock); |
1249 | return; | |
1250 | } | |
1251 | /* else, v3 */ | |
1252 | ||
a9fe8e29 | 1253 | im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
1254 | igmp_ifc_event(in_dev); |
1255 | #endif | |
1256 | } | |
1257 | ||
1258 | ||
1259 | /* | |
1260 | * Multicast list managers | |
1261 | */ | |
1262 | ||
e9897071 ED |
1263 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1264 | { | |
c70eba74 | 1265 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1266 | } |
1267 | ||
1268 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1269 | struct ip_mc_list *im) | |
1270 | { | |
1271 | struct ip_mc_list __rcu **mc_hash; | |
1272 | u32 hash; | |
1273 | ||
1274 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1275 | if (mc_hash) { | |
1276 | hash = ip_mc_hash(im); | |
c70eba74 | 1277 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1278 | rcu_assign_pointer(mc_hash[hash], im); |
1279 | return; | |
1280 | } | |
1281 | ||
1282 | /* do not use a hash table for small number of items */ | |
1283 | if (in_dev->mc_count < 4) | |
1284 | return; | |
1285 | ||
1286 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1287 | GFP_KERNEL); | |
1288 | if (!mc_hash) | |
1289 | return; | |
1290 | ||
1291 | for_each_pmc_rtnl(in_dev, im) { | |
1292 | hash = ip_mc_hash(im); | |
c70eba74 | 1293 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1294 | RCU_INIT_POINTER(mc_hash[hash], im); |
1295 | } | |
1296 | ||
1297 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1298 | } | |
1299 | ||
1300 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1301 | struct ip_mc_list *im) | |
1302 | { | |
1303 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1304 | struct ip_mc_list *aux; | |
1305 | ||
1306 | if (!mc_hash) | |
1307 | return; | |
1308 | mc_hash += ip_mc_hash(im); | |
1309 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1310 | mc_hash = &aux->next_hash; | |
1311 | *mc_hash = im->next_hash; | |
1312 | } | |
1313 | ||
1da177e4 LT |
1314 | |
1315 | /* | |
1316 | * A socket has joined a multicast group on device dev. | |
1317 | */ | |
1318 | ||
8f935bbd | 1319 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1320 | { |
1321 | struct ip_mc_list *im; | |
1322 | ||
1323 | ASSERT_RTNL(); | |
1324 | ||
1d7138de | 1325 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1326 | if (im->multiaddr == addr) { |
1327 | im->users++; | |
1328 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1329 | goto out; | |
1330 | } | |
1331 | } | |
1332 | ||
1d7138de | 1333 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1334 | if (!im) |
1335 | goto out; | |
1336 | ||
a7e9ff73 JK |
1337 | im->users = 1; |
1338 | im->interface = in_dev; | |
1da177e4 | 1339 | in_dev_hold(in_dev); |
a7e9ff73 | 1340 | im->multiaddr = addr; |
1da177e4 LT |
1341 | /* initial mode is (EX, empty) */ |
1342 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1343 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1344 | atomic_set(&im->refcnt, 1); |
1345 | spin_lock_init(&im->lock); | |
1346 | #ifdef CONFIG_IP_MULTICAST | |
179542a5 | 1347 | setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im); |
a9fe8e29 | 1348 | im->unsolicit_count = sysctl_igmp_qrv; |
1da177e4 | 1349 | #endif |
1d7138de ED |
1350 | |
1351 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1352 | in_dev->mc_count++; |
cf778b00 | 1353 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1354 | |
e9897071 ED |
1355 | ip_mc_hash_add(in_dev, im); |
1356 | ||
1da177e4 LT |
1357 | #ifdef CONFIG_IP_MULTICAST |
1358 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1359 | #endif | |
1360 | igmp_group_added(im); | |
1361 | if (!in_dev->dead) | |
1362 | ip_rt_multicast_event(in_dev); | |
1363 | out: | |
1364 | return; | |
1365 | } | |
4bc2f18b | 1366 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1367 | |
9afd85c9 LL |
1368 | static int ip_mc_check_iphdr(struct sk_buff *skb) |
1369 | { | |
1370 | const struct iphdr *iph; | |
1371 | unsigned int len; | |
1372 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1373 | ||
1374 | if (!pskb_may_pull(skb, offset)) | |
1375 | return -EINVAL; | |
1376 | ||
1377 | iph = ip_hdr(skb); | |
1378 | ||
1379 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1380 | return -EINVAL; | |
1381 | ||
1382 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1383 | ||
1384 | if (!pskb_may_pull(skb, offset)) | |
1385 | return -EINVAL; | |
1386 | ||
1387 | iph = ip_hdr(skb); | |
1388 | ||
1389 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1390 | return -EINVAL; | |
1391 | ||
1392 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1393 | if (skb->len < len || len < offset) | |
1394 | return -EINVAL; | |
1395 | ||
1396 | skb_set_transport_header(skb, offset); | |
1397 | ||
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1402 | { | |
1403 | unsigned int len = skb_transport_offset(skb); | |
1404 | ||
1405 | len += sizeof(struct igmpv3_report); | |
1406 | ||
1407 | return pskb_may_pull(skb, len) ? 0 : -EINVAL; | |
1408 | } | |
1409 | ||
1410 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1411 | { | |
1412 | unsigned int len = skb_transport_offset(skb); | |
1413 | ||
1414 | len += sizeof(struct igmphdr); | |
1415 | if (skb->len < len) | |
1416 | return -EINVAL; | |
1417 | ||
1418 | /* IGMPv{1,2}? */ | |
1419 | if (skb->len != len) { | |
1420 | /* or IGMPv3? */ | |
1421 | len += sizeof(struct igmpv3_query) - sizeof(struct igmphdr); | |
1422 | if (skb->len < len || !pskb_may_pull(skb, len)) | |
1423 | return -EINVAL; | |
1424 | } | |
1425 | ||
1426 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1427 | * all-systems destination addresses (224.0.0.1) for general queries | |
1428 | */ | |
1429 | if (!igmp_hdr(skb)->group && | |
1430 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1431 | return -EINVAL; | |
1432 | ||
1433 | return 0; | |
1434 | } | |
1435 | ||
1436 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1437 | { | |
1438 | switch (igmp_hdr(skb)->type) { | |
1439 | case IGMP_HOST_LEAVE_MESSAGE: | |
1440 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1441 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1442 | /* fall through */ | |
1443 | return 0; | |
1444 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1445 | return ip_mc_check_igmp_reportv3(skb); | |
1446 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1447 | return ip_mc_check_igmp_query(skb); | |
1448 | default: | |
1449 | return -ENOMSG; | |
1450 | } | |
1451 | } | |
1452 | ||
1453 | static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) | |
1454 | { | |
1455 | return skb_checksum_simple_validate(skb); | |
1456 | } | |
1457 | ||
1458 | static int __ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1459 | ||
1460 | { | |
1461 | struct sk_buff *skb_chk; | |
1462 | unsigned int transport_len; | |
1463 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); | |
a516993f | 1464 | int ret = -EINVAL; |
9afd85c9 LL |
1465 | |
1466 | transport_len = ntohs(ip_hdr(skb)->tot_len) - ip_hdrlen(skb); | |
1467 | ||
9afd85c9 LL |
1468 | skb_chk = skb_checksum_trimmed(skb, transport_len, |
1469 | ip_mc_validate_checksum); | |
1470 | if (!skb_chk) | |
a516993f | 1471 | goto err; |
9afd85c9 | 1472 | |
a516993f LL |
1473 | if (!pskb_may_pull(skb_chk, len)) |
1474 | goto err; | |
9afd85c9 LL |
1475 | |
1476 | ret = ip_mc_check_igmp_msg(skb_chk); | |
a516993f LL |
1477 | if (ret) |
1478 | goto err; | |
9afd85c9 LL |
1479 | |
1480 | if (skb_trimmed) | |
1481 | *skb_trimmed = skb_chk; | |
a516993f LL |
1482 | /* free now unneeded clone */ |
1483 | else if (skb_chk != skb) | |
9afd85c9 LL |
1484 | kfree_skb(skb_chk); |
1485 | ||
a516993f LL |
1486 | ret = 0; |
1487 | ||
1488 | err: | |
1489 | if (ret && skb_chk && skb_chk != skb) | |
1490 | kfree_skb(skb_chk); | |
1491 | ||
1492 | return ret; | |
9afd85c9 LL |
1493 | } |
1494 | ||
1495 | /** | |
1496 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1497 | * @skb: the skb to validate | |
1498 | * @skb_trimmed: to store an skb pointer trimmed to IPv4 packet tail (optional) | |
1499 | * | |
1500 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
a516993f | 1501 | * skb transport header accordingly and returns zero. |
9afd85c9 LL |
1502 | * |
1503 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1504 | * standard | |
1505 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1506 | * -ENOMEM: A memory allocation failure happened. | |
1507 | * | |
1508 | * Optionally, an skb pointer might be provided via skb_trimmed (or set it | |
1509 | * to NULL): After parsing an IGMP packet successfully it will point to | |
1510 | * an skb which has its tail aligned to the IP packet end. This might | |
1511 | * either be the originally provided skb or a trimmed, cloned version if | |
1512 | * the skb frame had data beyond the IP packet. A cloned skb allows us | |
1513 | * to leave the original skb and its full frame unchanged (which might be | |
1514 | * desirable for layer 2 frame jugglers). | |
1515 | * | |
a516993f LL |
1516 | * Caller needs to set the skb network header and free any returned skb if it |
1517 | * differs from the provided skb. | |
9afd85c9 LL |
1518 | */ |
1519 | int ip_mc_check_igmp(struct sk_buff *skb, struct sk_buff **skb_trimmed) | |
1520 | { | |
1521 | int ret = ip_mc_check_iphdr(skb); | |
1522 | ||
1523 | if (ret < 0) | |
1524 | return ret; | |
1525 | ||
1526 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1527 | return -ENOMSG; | |
1528 | ||
1529 | return __ip_mc_check_igmp(skb, skb_trimmed); | |
1530 | } | |
1531 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1532 | ||
a816c7c7 | 1533 | /* |
4aa5dee4 | 1534 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1535 | */ |
4aa5dee4 | 1536 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1537 | { |
08882669 | 1538 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1539 | struct ip_mc_list *im; |
1540 | int type; | |
a816c7c7 | 1541 | |
4aa5dee4 JP |
1542 | ASSERT_RTNL(); |
1543 | ||
1544 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1545 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1546 | continue; | |
df2cf4a7 PD |
1547 | if (ipv4_is_local_multicast(im->multiaddr) && |
1548 | !sysctl_igmp_llm_reports) | |
1549 | continue; | |
a816c7c7 | 1550 | |
866f3b25 ED |
1551 | /* a failover is happening and switches |
1552 | * must be notified immediately | |
1553 | */ | |
1554 | if (IGMP_V1_SEEN(in_dev)) | |
1555 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1556 | else if (IGMP_V2_SEEN(in_dev)) | |
1557 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1558 | else | |
1559 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1560 | igmp_send_report(in_dev, im, type); | |
1561 | } | |
a816c7c7 JV |
1562 | #endif |
1563 | } | |
1564 | ||
1da177e4 LT |
1565 | /* |
1566 | * A socket has left a multicast group on device dev | |
1567 | */ | |
1568 | ||
8f935bbd | 1569 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1570 | { |
1d7138de ED |
1571 | struct ip_mc_list *i; |
1572 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1573 | |
1da177e4 | 1574 | ASSERT_RTNL(); |
e905a9ed | 1575 | |
1d7138de ED |
1576 | for (ip = &in_dev->mc_list; |
1577 | (i = rtnl_dereference(*ip)) != NULL; | |
1578 | ip = &i->next_rcu) { | |
a7e9ff73 | 1579 | if (i->multiaddr == addr) { |
1da177e4 | 1580 | if (--i->users == 0) { |
e9897071 | 1581 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1582 | *ip = i->next_rcu; |
b8bae41e | 1583 | in_dev->mc_count--; |
1da177e4 | 1584 | igmp_group_dropped(i); |
24cf3af3 | 1585 | ip_mc_clear_src(i); |
1da177e4 LT |
1586 | |
1587 | if (!in_dev->dead) | |
1588 | ip_rt_multicast_event(in_dev); | |
1589 | ||
1590 | ip_ma_put(i); | |
1591 | return; | |
1592 | } | |
1593 | break; | |
1594 | } | |
1595 | } | |
1596 | } | |
4bc2f18b | 1597 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1598 | |
75c78500 MS |
1599 | /* Device changing type */ |
1600 | ||
1601 | void ip_mc_unmap(struct in_device *in_dev) | |
1602 | { | |
1d7138de | 1603 | struct ip_mc_list *pmc; |
75c78500 MS |
1604 | |
1605 | ASSERT_RTNL(); | |
1606 | ||
1d7138de ED |
1607 | for_each_pmc_rtnl(in_dev, pmc) |
1608 | igmp_group_dropped(pmc); | |
75c78500 MS |
1609 | } |
1610 | ||
1611 | void ip_mc_remap(struct in_device *in_dev) | |
1612 | { | |
1d7138de | 1613 | struct ip_mc_list *pmc; |
75c78500 MS |
1614 | |
1615 | ASSERT_RTNL(); | |
1616 | ||
1d7138de ED |
1617 | for_each_pmc_rtnl(in_dev, pmc) |
1618 | igmp_group_added(pmc); | |
75c78500 MS |
1619 | } |
1620 | ||
1da177e4 LT |
1621 | /* Device going down */ |
1622 | ||
1623 | void ip_mc_down(struct in_device *in_dev) | |
1624 | { | |
1d7138de | 1625 | struct ip_mc_list *pmc; |
1da177e4 LT |
1626 | |
1627 | ASSERT_RTNL(); | |
1628 | ||
1d7138de ED |
1629 | for_each_pmc_rtnl(in_dev, pmc) |
1630 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1631 | |
1632 | #ifdef CONFIG_IP_MULTICAST | |
1633 | in_dev->mr_ifc_count = 0; | |
1634 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1635 | __in_dev_put(in_dev); | |
1636 | in_dev->mr_gq_running = 0; | |
1637 | if (del_timer(&in_dev->mr_gq_timer)) | |
1638 | __in_dev_put(in_dev); | |
1639 | igmpv3_clear_delrec(in_dev); | |
1640 | #endif | |
1641 | ||
1642 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1643 | } | |
1644 | ||
1645 | void ip_mc_init_dev(struct in_device *in_dev) | |
1646 | { | |
1647 | ASSERT_RTNL(); | |
1648 | ||
1da177e4 | 1649 | #ifdef CONFIG_IP_MULTICAST |
b24b8a24 PE |
1650 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1651 | (unsigned long)in_dev); | |
b24b8a24 PE |
1652 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1653 | (unsigned long)in_dev); | |
a9fe8e29 | 1654 | in_dev->mr_qrv = sysctl_igmp_qrv; |
1da177e4 LT |
1655 | #endif |
1656 | ||
1da177e4 LT |
1657 | spin_lock_init(&in_dev->mc_tomb_lock); |
1658 | } | |
1659 | ||
1660 | /* Device going up */ | |
1661 | ||
1662 | void ip_mc_up(struct in_device *in_dev) | |
1663 | { | |
1d7138de | 1664 | struct ip_mc_list *pmc; |
1da177e4 LT |
1665 | |
1666 | ASSERT_RTNL(); | |
1667 | ||
a9fe8e29 HFS |
1668 | #ifdef CONFIG_IP_MULTICAST |
1669 | in_dev->mr_qrv = sysctl_igmp_qrv; | |
1670 | #endif | |
1da177e4 LT |
1671 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1672 | ||
1d7138de ED |
1673 | for_each_pmc_rtnl(in_dev, pmc) |
1674 | igmp_group_added(pmc); | |
1da177e4 LT |
1675 | } |
1676 | ||
1677 | /* | |
1678 | * Device is about to be destroyed: clean up. | |
1679 | */ | |
1680 | ||
1681 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1682 | { | |
1683 | struct ip_mc_list *i; | |
1684 | ||
1685 | ASSERT_RTNL(); | |
1686 | ||
1687 | /* Deactivate timers */ | |
1688 | ip_mc_down(in_dev); | |
1689 | ||
1d7138de ED |
1690 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1691 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1692 | in_dev->mc_count--; |
1d7138de | 1693 | |
24cf3af3 VF |
1694 | /* We've dropped the groups in ip_mc_down already */ |
1695 | ip_mc_clear_src(i); | |
1da177e4 | 1696 | ip_ma_put(i); |
1da177e4 | 1697 | } |
1da177e4 LT |
1698 | } |
1699 | ||
9e917dca | 1700 | /* RTNL is locked */ |
877acedc | 1701 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1702 | { |
1da177e4 LT |
1703 | struct net_device *dev = NULL; |
1704 | struct in_device *idev = NULL; | |
1705 | ||
1706 | if (imr->imr_ifindex) { | |
877acedc | 1707 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1708 | return idev; |
1709 | } | |
1710 | if (imr->imr_address.s_addr) { | |
9e917dca | 1711 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1712 | if (!dev) |
1713 | return NULL; | |
1da177e4 LT |
1714 | } |
1715 | ||
b23dd4fe | 1716 | if (!dev) { |
78fbfd8a DM |
1717 | struct rtable *rt = ip_route_output(net, |
1718 | imr->imr_multiaddr.s_addr, | |
1719 | 0, 0, 0); | |
b23dd4fe DM |
1720 | if (!IS_ERR(rt)) { |
1721 | dev = rt->dst.dev; | |
1722 | ip_rt_put(rt); | |
1723 | } | |
1da177e4 LT |
1724 | } |
1725 | if (dev) { | |
1726 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1727 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1728 | } |
1729 | return idev; | |
1730 | } | |
1731 | ||
1732 | /* | |
1733 | * Join a socket to a group | |
1734 | */ | |
ab32ea5d BH |
1735 | int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; |
1736 | int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; | |
a9fe8e29 | 1737 | #ifdef CONFIG_IP_MULTICAST |
436f7c20 | 1738 | int sysctl_igmp_qrv __read_mostly = IGMP_QUERY_ROBUSTNESS_VARIABLE; |
a9fe8e29 | 1739 | #endif |
1da177e4 LT |
1740 | |
1741 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1742 | __be32 *psfsrc) |
1da177e4 LT |
1743 | { |
1744 | struct ip_sf_list *psf, *psf_prev; | |
1745 | int rv = 0; | |
1746 | ||
1747 | psf_prev = NULL; | |
c71151f0 | 1748 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1749 | if (psf->sf_inaddr == *psfsrc) |
1750 | break; | |
1751 | psf_prev = psf; | |
1752 | } | |
1753 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1754 | /* source filter not found, or count wrong => bug */ | |
1755 | return -ESRCH; | |
1756 | } | |
1757 | psf->sf_count[sfmode]--; | |
1758 | if (psf->sf_count[sfmode] == 0) { | |
1759 | ip_rt_multicast_event(pmc->interface); | |
1760 | } | |
1761 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1762 | #ifdef CONFIG_IP_MULTICAST | |
1763 | struct in_device *in_dev = pmc->interface; | |
1764 | #endif | |
1765 | ||
1766 | /* no more filters for this source */ | |
1767 | if (psf_prev) | |
1768 | psf_prev->sf_next = psf->sf_next; | |
1769 | else | |
1770 | pmc->sources = psf->sf_next; | |
1771 | #ifdef CONFIG_IP_MULTICAST | |
1772 | if (psf->sf_oldin && | |
1773 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
a9fe8e29 | 1774 | psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
1775 | psf->sf_next = pmc->tomb; |
1776 | pmc->tomb = psf; | |
1777 | rv = 1; | |
1778 | } else | |
1779 | #endif | |
1780 | kfree(psf); | |
1781 | } | |
1782 | return rv; | |
1783 | } | |
1784 | ||
1785 | #ifndef CONFIG_IP_MULTICAST | |
1786 | #define igmp_ifc_event(x) do { } while (0) | |
1787 | #endif | |
1788 | ||
8f935bbd AV |
1789 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1790 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1791 | { |
1792 | struct ip_mc_list *pmc; | |
1793 | int changerec = 0; | |
1794 | int i, err; | |
1795 | ||
1796 | if (!in_dev) | |
1797 | return -ENODEV; | |
1d7138de ED |
1798 | rcu_read_lock(); |
1799 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1800 | if (*pmca == pmc->multiaddr) |
1801 | break; | |
1802 | } | |
1803 | if (!pmc) { | |
1804 | /* MCA not found?? bug */ | |
1d7138de | 1805 | rcu_read_unlock(); |
1da177e4 LT |
1806 | return -ESRCH; |
1807 | } | |
1808 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1809 | rcu_read_unlock(); |
1da177e4 LT |
1810 | #ifdef CONFIG_IP_MULTICAST |
1811 | sf_markstate(pmc); | |
1812 | #endif | |
1813 | if (!delta) { | |
1814 | err = -EINVAL; | |
1815 | if (!pmc->sfcount[sfmode]) | |
1816 | goto out_unlock; | |
1817 | pmc->sfcount[sfmode]--; | |
1818 | } | |
1819 | err = 0; | |
c71151f0 | 1820 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
1821 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
1822 | ||
1823 | changerec |= rv > 0; | |
1824 | if (!err && rv < 0) | |
1825 | err = rv; | |
1826 | } | |
1827 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1828 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1829 | pmc->sfcount[MCAST_INCLUDE]) { | |
1830 | #ifdef CONFIG_IP_MULTICAST | |
1831 | struct ip_sf_list *psf; | |
1832 | #endif | |
1833 | ||
1834 | /* filter mode change */ | |
1835 | pmc->sfmode = MCAST_INCLUDE; | |
1836 | #ifdef CONFIG_IP_MULTICAST | |
a9fe8e29 | 1837 | pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 | 1838 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 1839 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1840 | psf->sf_crcount = 0; |
1841 | igmp_ifc_event(pmc->interface); | |
1842 | } else if (sf_setstate(pmc) || changerec) { | |
1843 | igmp_ifc_event(pmc->interface); | |
1844 | #endif | |
1845 | } | |
1846 | out_unlock: | |
1847 | spin_unlock_bh(&pmc->lock); | |
1848 | return err; | |
1849 | } | |
1850 | ||
1851 | /* | |
1852 | * Add multicast single-source filter to the interface list | |
1853 | */ | |
1854 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1855 | __be32 *psfsrc) |
1da177e4 LT |
1856 | { |
1857 | struct ip_sf_list *psf, *psf_prev; | |
1858 | ||
1859 | psf_prev = NULL; | |
c71151f0 | 1860 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1861 | if (psf->sf_inaddr == *psfsrc) |
1862 | break; | |
1863 | psf_prev = psf; | |
1864 | } | |
1865 | if (!psf) { | |
0da974f4 | 1866 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1867 | if (!psf) |
1868 | return -ENOBUFS; | |
1da177e4 LT |
1869 | psf->sf_inaddr = *psfsrc; |
1870 | if (psf_prev) { | |
1871 | psf_prev->sf_next = psf; | |
1872 | } else | |
1873 | pmc->sources = psf; | |
1874 | } | |
1875 | psf->sf_count[sfmode]++; | |
1876 | if (psf->sf_count[sfmode] == 1) { | |
1877 | ip_rt_multicast_event(pmc->interface); | |
1878 | } | |
1879 | return 0; | |
1880 | } | |
1881 | ||
1882 | #ifdef CONFIG_IP_MULTICAST | |
1883 | static void sf_markstate(struct ip_mc_list *pmc) | |
1884 | { | |
1885 | struct ip_sf_list *psf; | |
1886 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1887 | ||
c71151f0 | 1888 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1889 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1890 | psf->sf_oldin = mca_xcount == | |
1891 | psf->sf_count[MCAST_EXCLUDE] && | |
1892 | !psf->sf_count[MCAST_INCLUDE]; | |
1893 | } else | |
1894 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1895 | } | |
1896 | ||
1897 | static int sf_setstate(struct ip_mc_list *pmc) | |
1898 | { | |
ad12583f | 1899 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1900 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1901 | int qrv = pmc->interface->mr_qrv; | |
1902 | int new_in, rv; | |
1903 | ||
1904 | rv = 0; | |
c71151f0 | 1905 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1906 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1907 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1908 | !psf->sf_count[MCAST_INCLUDE]; | |
1909 | } else | |
1910 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1911 | if (new_in) { |
1912 | if (!psf->sf_oldin) { | |
76edc605 | 1913 | struct ip_sf_list *prev = NULL; |
ad12583f | 1914 | |
c71151f0 | 1915 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
1916 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1917 | break; | |
1918 | prev = dpsf; | |
1919 | } | |
1920 | if (dpsf) { | |
1921 | if (prev) | |
1922 | prev->sf_next = dpsf->sf_next; | |
1923 | else | |
1924 | pmc->tomb = dpsf->sf_next; | |
1925 | kfree(dpsf); | |
1926 | } | |
1927 | psf->sf_crcount = qrv; | |
1928 | rv++; | |
1929 | } | |
1930 | } else if (psf->sf_oldin) { | |
1931 | ||
1932 | psf->sf_crcount = 0; | |
1933 | /* | |
1934 | * add or update "delete" records if an active filter | |
1935 | * is now inactive | |
1936 | */ | |
c71151f0 | 1937 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
1938 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1939 | break; | |
1940 | if (!dpsf) { | |
3ed37a6f | 1941 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1942 | if (!dpsf) |
1943 | continue; | |
1944 | *dpsf = *psf; | |
1945 | /* pmc->lock held by callers */ | |
1946 | dpsf->sf_next = pmc->tomb; | |
1947 | pmc->tomb = dpsf; | |
1948 | } | |
1949 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1950 | rv++; |
1951 | } | |
1952 | } | |
1953 | return rv; | |
1954 | } | |
1955 | #endif | |
1956 | ||
1957 | /* | |
1958 | * Add multicast source filter list to the interface list | |
1959 | */ | |
8f935bbd AV |
1960 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1961 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1962 | { |
1963 | struct ip_mc_list *pmc; | |
1964 | int isexclude; | |
1965 | int i, err; | |
1966 | ||
1967 | if (!in_dev) | |
1968 | return -ENODEV; | |
1d7138de ED |
1969 | rcu_read_lock(); |
1970 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1971 | if (*pmca == pmc->multiaddr) |
1972 | break; | |
1973 | } | |
1974 | if (!pmc) { | |
1975 | /* MCA not found?? bug */ | |
1d7138de | 1976 | rcu_read_unlock(); |
1da177e4 LT |
1977 | return -ESRCH; |
1978 | } | |
1979 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1980 | rcu_read_unlock(); |
1da177e4 LT |
1981 | |
1982 | #ifdef CONFIG_IP_MULTICAST | |
1983 | sf_markstate(pmc); | |
1984 | #endif | |
1985 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1986 | if (!delta) | |
1987 | pmc->sfcount[sfmode]++; | |
1988 | err = 0; | |
c71151f0 | 1989 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 1990 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
1991 | if (err) |
1992 | break; | |
1993 | } | |
1994 | if (err) { | |
1995 | int j; | |
1996 | ||
685f94e6 JZ |
1997 | if (!delta) |
1998 | pmc->sfcount[sfmode]--; | |
c71151f0 | 1999 | for (j = 0; j < i; j++) |
a1889c0d | 2000 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
2001 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
2002 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 2003 | struct ip_sf_list *psf; |
cfcabdcc | 2004 | in_dev = pmc->interface; |
1da177e4 LT |
2005 | #endif |
2006 | ||
2007 | /* filter mode change */ | |
2008 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
2009 | pmc->sfmode = MCAST_EXCLUDE; | |
2010 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
2011 | pmc->sfmode = MCAST_INCLUDE; | |
2012 | #ifdef CONFIG_IP_MULTICAST | |
2013 | /* else no filters; keep old mode for reports */ | |
2014 | ||
a9fe8e29 | 2015 | pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 | 2016 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 2017 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2018 | psf->sf_crcount = 0; |
2019 | igmp_ifc_event(in_dev); | |
2020 | } else if (sf_setstate(pmc)) { | |
2021 | igmp_ifc_event(in_dev); | |
2022 | #endif | |
2023 | } | |
2024 | spin_unlock_bh(&pmc->lock); | |
2025 | return err; | |
2026 | } | |
2027 | ||
2028 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
2029 | { | |
ee8d5f9f | 2030 | struct ip_sf_list *psf, *nextpsf, *tomb, *sources; |
1da177e4 | 2031 | |
ee8d5f9f WC |
2032 | spin_lock_bh(&pmc->lock); |
2033 | tomb = pmc->tomb; | |
2034 | pmc->tomb = NULL; | |
2035 | sources = pmc->sources; | |
2036 | pmc->sources = NULL; | |
2037 | pmc->sfmode = MCAST_EXCLUDE; | |
2038 | pmc->sfcount[MCAST_INCLUDE] = 0; | |
2039 | pmc->sfcount[MCAST_EXCLUDE] = 1; | |
2040 | spin_unlock_bh(&pmc->lock); | |
2041 | ||
2042 | for (psf = tomb; psf; psf = nextpsf) { | |
1da177e4 LT |
2043 | nextpsf = psf->sf_next; |
2044 | kfree(psf); | |
2045 | } | |
ee8d5f9f | 2046 | for (psf = sources; psf; psf = nextpsf) { |
1da177e4 LT |
2047 | nextpsf = psf->sf_next; |
2048 | kfree(psf); | |
2049 | } | |
1da177e4 LT |
2050 | } |
2051 | ||
54ff9ef3 MRL |
2052 | /* Join a multicast group |
2053 | */ | |
2054 | ||
2055 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
1da177e4 | 2056 | { |
8f935bbd | 2057 | __be32 addr = imr->imr_multiaddr.s_addr; |
959d10f6 | 2058 | struct ip_mc_socklist *iml, *i; |
1da177e4 LT |
2059 | struct in_device *in_dev; |
2060 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 2061 | struct net *net = sock_net(sk); |
ca9b907d | 2062 | int ifindex; |
1da177e4 | 2063 | int count = 0; |
959d10f6 ED |
2064 | int err; |
2065 | ||
2066 | ASSERT_RTNL(); | |
1da177e4 | 2067 | |
f97c1e0c | 2068 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2069 | return -EINVAL; |
2070 | ||
877acedc | 2071 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
2072 | |
2073 | if (!in_dev) { | |
1da177e4 LT |
2074 | err = -ENODEV; |
2075 | goto done; | |
2076 | } | |
2077 | ||
1da177e4 | 2078 | err = -EADDRINUSE; |
ca9b907d | 2079 | ifindex = imr->imr_ifindex; |
1d7138de | 2080 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
2081 | if (i->multi.imr_multiaddr.s_addr == addr && |
2082 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 2083 | goto done; |
1da177e4 LT |
2084 | count++; |
2085 | } | |
2086 | err = -ENOBUFS; | |
ca9b907d DS |
2087 | if (count >= sysctl_igmp_max_memberships) |
2088 | goto done; | |
a7e9ff73 | 2089 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
51456b29 | 2090 | if (!iml) |
1da177e4 | 2091 | goto done; |
ca9b907d | 2092 | |
1da177e4 | 2093 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 2094 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
2095 | iml->sflist = NULL; |
2096 | iml->sfmode = MCAST_EXCLUDE; | |
cf778b00 | 2097 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 2098 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 2099 | err = 0; |
1da177e4 | 2100 | done: |
1da177e4 LT |
2101 | return err; |
2102 | } | |
4bc2f18b | 2103 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
2104 | |
2105 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
2106 | struct in_device *in_dev) | |
2107 | { | |
1d7138de | 2108 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
2109 | int err; |
2110 | ||
51456b29 | 2111 | if (!psf) { |
1da177e4 LT |
2112 | /* any-source empty exclude case */ |
2113 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2114 | iml->sfmode, 0, NULL, 0); | |
2115 | } | |
2116 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 2117 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 2118 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
2119 | /* decrease mem now to avoid the memleak warning */ |
2120 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2121 | kfree_rcu(psf, rcu); |
1da177e4 LT |
2122 | return err; |
2123 | } | |
2124 | ||
54ff9ef3 | 2125 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
1da177e4 LT |
2126 | { |
2127 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
2128 | struct ip_mc_socklist *iml; |
2129 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 2130 | struct in_device *in_dev; |
877acedc | 2131 | struct net *net = sock_net(sk); |
8f935bbd | 2132 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 2133 | u32 ifindex; |
acd6e00b | 2134 | int ret = -EADDRNOTAVAIL; |
1da177e4 | 2135 | |
959d10f6 ED |
2136 | ASSERT_RTNL(); |
2137 | ||
877acedc | 2138 | in_dev = ip_mc_find_dev(net, imr); |
4eba7bb1 | 2139 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
52ad353a | 2140 | ret = -ENODEV; |
2141 | goto out; | |
2142 | } | |
84b42bae | 2143 | ifindex = imr->imr_ifindex; |
1d7138de ED |
2144 | for (imlp = &inet->mc_list; |
2145 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2146 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
2147 | if (iml->multi.imr_multiaddr.s_addr != group) |
2148 | continue; | |
2149 | if (ifindex) { | |
2150 | if (iml->multi.imr_ifindex != ifindex) | |
2151 | continue; | |
2152 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2153 | iml->multi.imr_address.s_addr) | |
2154 | continue; | |
1da177e4 | 2155 | |
acd6e00b | 2156 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 2157 | |
1d7138de | 2158 | *imlp = iml->next_rcu; |
acd6e00b | 2159 | |
4eba7bb1 AL |
2160 | if (in_dev) |
2161 | ip_mc_dec_group(in_dev, group); | |
959d10f6 | 2162 | |
c85bb41e FL |
2163 | /* decrease mem now to avoid the memleak warning */ |
2164 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2165 | kfree_rcu(iml, rcu); |
acd6e00b | 2166 | return 0; |
1da177e4 | 2167 | } |
52ad353a | 2168 | out: |
959d10f6 ED |
2169 | return ret; |
2170 | } | |
193ba924 | 2171 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
2172 | |
2173 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2174 | ip_mreq_source *mreqs, int ifindex) | |
2175 | { | |
2176 | int err; | |
2177 | struct ip_mreqn imr; | |
63007727 | 2178 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
2179 | struct ip_mc_socklist *pmc; |
2180 | struct in_device *in_dev = NULL; | |
2181 | struct inet_sock *inet = inet_sk(sk); | |
2182 | struct ip_sf_socklist *psl; | |
877acedc | 2183 | struct net *net = sock_net(sk); |
8cdaaa15 | 2184 | int leavegroup = 0; |
1da177e4 LT |
2185 | int i, j, rv; |
2186 | ||
f97c1e0c | 2187 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2188 | return -EINVAL; |
2189 | ||
54ff9ef3 | 2190 | ASSERT_RTNL(); |
1da177e4 LT |
2191 | |
2192 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2193 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2194 | imr.imr_ifindex = ifindex; | |
877acedc | 2195 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2196 | |
2197 | if (!in_dev) { | |
2198 | err = -ENODEV; | |
2199 | goto done; | |
2200 | } | |
2201 | err = -EADDRNOTAVAIL; | |
2202 | ||
1d7138de | 2203 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2204 | if ((pmc->multi.imr_multiaddr.s_addr == |
2205 | imr.imr_multiaddr.s_addr) && | |
2206 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2207 | break; |
2208 | } | |
917f2f10 DS |
2209 | if (!pmc) { /* must have a prior join */ |
2210 | err = -EINVAL; | |
1da177e4 | 2211 | goto done; |
917f2f10 | 2212 | } |
1da177e4 LT |
2213 | /* if a source filter was set, must be the same mode as before */ |
2214 | if (pmc->sflist) { | |
917f2f10 DS |
2215 | if (pmc->sfmode != omode) { |
2216 | err = -EINVAL; | |
1da177e4 | 2217 | goto done; |
917f2f10 | 2218 | } |
1da177e4 LT |
2219 | } else if (pmc->sfmode != omode) { |
2220 | /* allow mode switches for empty-set filters */ | |
2221 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2222 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2223 | NULL, 0); |
2224 | pmc->sfmode = omode; | |
2225 | } | |
2226 | ||
1d7138de | 2227 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2228 | if (!add) { |
2229 | if (!psl) | |
917f2f10 | 2230 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2231 | rv = !0; |
c71151f0 | 2232 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2233 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2234 | sizeof(__be32)); |
1da177e4 LT |
2235 | if (rv == 0) |
2236 | break; | |
2237 | } | |
2238 | if (rv) /* source not found */ | |
917f2f10 | 2239 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2240 | |
8cdaaa15 DS |
2241 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2242 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2243 | leavegroup = 1; | |
2244 | goto done; | |
2245 | } | |
2246 | ||
1da177e4 | 2247 | /* update the interface filter */ |
e905a9ed | 2248 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2249 | &mreqs->imr_sourceaddr, 1); |
2250 | ||
c71151f0 | 2251 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2252 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2253 | psl->sl_count--; | |
2254 | err = 0; | |
2255 | goto done; | |
2256 | } | |
2257 | /* else, add a new source to the filter */ | |
2258 | ||
2259 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
2260 | err = -ENOBUFS; | |
2261 | goto done; | |
2262 | } | |
2263 | if (!psl || psl->sl_count == psl->sl_max) { | |
2264 | struct ip_sf_socklist *newpsl; | |
2265 | int count = IP_SFBLOCK; | |
2266 | ||
2267 | if (psl) | |
2268 | count += psl->sl_max; | |
8b3a7005 | 2269 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2270 | if (!newpsl) { |
2271 | err = -ENOBUFS; | |
2272 | goto done; | |
2273 | } | |
2274 | newpsl->sl_max = count; | |
2275 | newpsl->sl_count = count - IP_SFBLOCK; | |
2276 | if (psl) { | |
c71151f0 | 2277 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2278 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e FL |
2279 | /* decrease mem now to avoid the memleak warning */ |
2280 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2281 | kfree_rcu(psl, rcu); |
1da177e4 | 2282 | } |
cf778b00 | 2283 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2284 | psl = newpsl; |
1da177e4 LT |
2285 | } |
2286 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2287 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2288 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2289 | sizeof(__be32)); |
1da177e4 LT |
2290 | if (rv == 0) |
2291 | break; | |
2292 | } | |
2293 | if (rv == 0) /* address already there is an error */ | |
2294 | goto done; | |
c71151f0 | 2295 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2296 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2297 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2298 | psl->sl_count++; | |
2299 | err = 0; | |
2300 | /* update the interface list */ | |
e905a9ed | 2301 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2302 | &mreqs->imr_sourceaddr, 1); |
2303 | done: | |
8cdaaa15 | 2304 | if (leavegroup) |
54ff9ef3 | 2305 | err = ip_mc_leave_group(sk, &imr); |
1da177e4 LT |
2306 | return err; |
2307 | } | |
2308 | ||
2309 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2310 | { | |
9951f036 | 2311 | int err = 0; |
1da177e4 | 2312 | struct ip_mreqn imr; |
63007727 | 2313 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2314 | struct ip_mc_socklist *pmc; |
2315 | struct in_device *in_dev; | |
2316 | struct inet_sock *inet = inet_sk(sk); | |
2317 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2318 | struct net *net = sock_net(sk); |
9951f036 | 2319 | int leavegroup = 0; |
1da177e4 | 2320 | |
f97c1e0c | 2321 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2322 | return -EINVAL; |
2323 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2324 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2325 | return -EINVAL; | |
2326 | ||
54ff9ef3 | 2327 | ASSERT_RTNL(); |
1da177e4 LT |
2328 | |
2329 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2330 | imr.imr_address.s_addr = msf->imsf_interface; | |
2331 | imr.imr_ifindex = ifindex; | |
877acedc | 2332 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2333 | |
2334 | if (!in_dev) { | |
2335 | err = -ENODEV; | |
2336 | goto done; | |
2337 | } | |
1da177e4 | 2338 | |
9951f036 DS |
2339 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2340 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2341 | leavegroup = 1; | |
2342 | goto done; | |
2343 | } | |
2344 | ||
1d7138de | 2345 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2346 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2347 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2348 | break; | |
2349 | } | |
917f2f10 DS |
2350 | if (!pmc) { /* must have a prior join */ |
2351 | err = -EINVAL; | |
1da177e4 | 2352 | goto done; |
917f2f10 | 2353 | } |
1da177e4 | 2354 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2355 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2356 | GFP_KERNEL); | |
1da177e4 LT |
2357 | if (!newpsl) { |
2358 | err = -ENOBUFS; | |
2359 | goto done; | |
2360 | } | |
2361 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2362 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2363 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2364 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2365 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2366 | if (err) { | |
2367 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2368 | goto done; | |
2369 | } | |
8713dbf0 | 2370 | } else { |
1da177e4 | 2371 | newpsl = NULL; |
8713dbf0 YZ |
2372 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2373 | msf->imsf_fmode, 0, NULL, 0); | |
2374 | } | |
1d7138de | 2375 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2376 | if (psl) { |
2377 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2378 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2379 | /* decrease mem now to avoid the memleak warning */ |
2380 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2381 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2382 | } else |
2383 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2384 | 0, NULL, 0); | |
cf778b00 | 2385 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2386 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2387 | err = 0; |
1da177e4 | 2388 | done: |
9951f036 DS |
2389 | if (leavegroup) |
2390 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2391 | return err; |
2392 | } | |
2393 | ||
2394 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2395 | struct ip_msfilter __user *optval, int __user *optlen) | |
2396 | { | |
2397 | int err, len, count, copycount; | |
2398 | struct ip_mreqn imr; | |
63007727 | 2399 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2400 | struct ip_mc_socklist *pmc; |
2401 | struct in_device *in_dev; | |
2402 | struct inet_sock *inet = inet_sk(sk); | |
2403 | struct ip_sf_socklist *psl; | |
877acedc | 2404 | struct net *net = sock_net(sk); |
1da177e4 | 2405 | |
87e9f031 WC |
2406 | ASSERT_RTNL(); |
2407 | ||
f97c1e0c | 2408 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2409 | return -EINVAL; |
2410 | ||
1da177e4 LT |
2411 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
2412 | imr.imr_address.s_addr = msf->imsf_interface; | |
2413 | imr.imr_ifindex = 0; | |
877acedc | 2414 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2415 | |
2416 | if (!in_dev) { | |
2417 | err = -ENODEV; | |
2418 | goto done; | |
2419 | } | |
2420 | err = -EADDRNOTAVAIL; | |
2421 | ||
1d7138de | 2422 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2423 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2424 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2425 | break; | |
2426 | } | |
2427 | if (!pmc) /* must have a prior join */ | |
2428 | goto done; | |
2429 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2430 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2431 | if (!psl) { |
2432 | len = 0; | |
2433 | count = 0; | |
2434 | } else { | |
2435 | count = psl->sl_count; | |
2436 | } | |
2437 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2438 | len = copycount * sizeof(psl->sl_addr[0]); | |
2439 | msf->imsf_numsrc = count; | |
2440 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2441 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2442 | return -EFAULT; | |
2443 | } | |
2444 | if (len && | |
2445 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2446 | return -EFAULT; | |
2447 | return 0; | |
2448 | done: | |
1da177e4 LT |
2449 | return err; |
2450 | } | |
2451 | ||
2452 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2453 | struct group_filter __user *optval, int __user *optlen) | |
2454 | { | |
2455 | int err, i, count, copycount; | |
2456 | struct sockaddr_in *psin; | |
63007727 | 2457 | __be32 addr; |
1da177e4 LT |
2458 | struct ip_mc_socklist *pmc; |
2459 | struct inet_sock *inet = inet_sk(sk); | |
2460 | struct ip_sf_socklist *psl; | |
2461 | ||
87e9f031 WC |
2462 | ASSERT_RTNL(); |
2463 | ||
1da177e4 LT |
2464 | psin = (struct sockaddr_in *)&gsf->gf_group; |
2465 | if (psin->sin_family != AF_INET) | |
2466 | return -EINVAL; | |
2467 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2468 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2469 | return -EINVAL; |
2470 | ||
1da177e4 LT |
2471 | err = -EADDRNOTAVAIL; |
2472 | ||
1d7138de | 2473 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2474 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2475 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2476 | break; | |
2477 | } | |
2478 | if (!pmc) /* must have a prior join */ | |
2479 | goto done; | |
2480 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2481 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2482 | count = psl ? psl->sl_count : 0; |
2483 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2484 | gsf->gf_numsrc = count; | |
2485 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2486 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2487 | return -EFAULT; | |
2488 | } | |
c71151f0 | 2489 | for (i = 0; i < copycount; i++) { |
1da177e4 LT |
2490 | struct sockaddr_storage ss; |
2491 | ||
2492 | psin = (struct sockaddr_in *)&ss; | |
2493 | memset(&ss, 0, sizeof(ss)); | |
2494 | psin->sin_family = AF_INET; | |
2495 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2496 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2497 | return -EFAULT; | |
2498 | } | |
2499 | return 0; | |
2500 | done: | |
1da177e4 LT |
2501 | return err; |
2502 | } | |
2503 | ||
2504 | /* | |
2505 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2506 | */ | |
c0cda068 | 2507 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2508 | { |
2509 | struct inet_sock *inet = inet_sk(sk); | |
2510 | struct ip_mc_socklist *pmc; | |
2511 | struct ip_sf_socklist *psl; | |
2512 | int i; | |
c85bb41e | 2513 | int ret; |
1da177e4 | 2514 | |
c85bb41e | 2515 | ret = 1; |
f97c1e0c | 2516 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2517 | goto out; |
1da177e4 | 2518 | |
c85bb41e | 2519 | rcu_read_lock(); |
1d7138de | 2520 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2521 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2522 | pmc->multi.imr_ifindex == dif) | |
2523 | break; | |
2524 | } | |
c85bb41e | 2525 | ret = inet->mc_all; |
1da177e4 | 2526 | if (!pmc) |
c85bb41e | 2527 | goto unlock; |
1d7138de | 2528 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2529 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2530 | if (!psl) |
c85bb41e | 2531 | goto unlock; |
1da177e4 | 2532 | |
c71151f0 | 2533 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2534 | if (psl->sl_addr[i] == rmt_addr) |
2535 | break; | |
2536 | } | |
c85bb41e | 2537 | ret = 0; |
1da177e4 | 2538 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2539 | goto unlock; |
1da177e4 | 2540 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2541 | goto unlock; |
2542 | ret = 1; | |
2543 | unlock: | |
2544 | rcu_read_unlock(); | |
2545 | out: | |
2546 | return ret; | |
1da177e4 LT |
2547 | } |
2548 | ||
2549 | /* | |
2550 | * A socket is closing. | |
2551 | */ | |
2552 | ||
2553 | void ip_mc_drop_socket(struct sock *sk) | |
2554 | { | |
2555 | struct inet_sock *inet = inet_sk(sk); | |
2556 | struct ip_mc_socklist *iml; | |
877acedc | 2557 | struct net *net = sock_net(sk); |
1da177e4 | 2558 | |
51456b29 | 2559 | if (!inet->mc_list) |
1da177e4 LT |
2560 | return; |
2561 | ||
2562 | rtnl_lock(); | |
1d7138de | 2563 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2564 | struct in_device *in_dev; |
1da177e4 | 2565 | |
1d7138de | 2566 | inet->mc_list = iml->next_rcu; |
877acedc | 2567 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2568 | (void) ip_mc_leave_src(sk, iml, in_dev); |
00db4124 | 2569 | if (in_dev) |
1da177e4 | 2570 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2571 | /* decrease mem now to avoid the memleak warning */ |
2572 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2573 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2574 | } |
2575 | rtnl_unlock(); | |
2576 | } | |
2577 | ||
dbdd9a52 | 2578 | /* called with rcu_read_lock() */ |
2094acbb | 2579 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
1da177e4 LT |
2580 | { |
2581 | struct ip_mc_list *im; | |
e9897071 | 2582 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2583 | struct ip_sf_list *psf; |
2584 | int rv = 0; | |
2585 | ||
e9897071 ED |
2586 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2587 | if (mc_hash) { | |
c70eba74 | 2588 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2589 | |
2590 | for (im = rcu_dereference(mc_hash[hash]); | |
2591 | im != NULL; | |
2592 | im = rcu_dereference(im->next_hash)) { | |
2593 | if (im->multiaddr == mc_addr) | |
2594 | break; | |
2595 | } | |
2596 | } else { | |
2597 | for_each_pmc_rcu(in_dev, im) { | |
2598 | if (im->multiaddr == mc_addr) | |
2599 | break; | |
2600 | } | |
1da177e4 LT |
2601 | } |
2602 | if (im && proto == IPPROTO_IGMP) { | |
2603 | rv = 1; | |
2604 | } else if (im) { | |
2605 | if (src_addr) { | |
c71151f0 | 2606 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2607 | if (psf->sf_inaddr == src_addr) |
2608 | break; | |
2609 | } | |
2610 | if (psf) | |
2611 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2612 | psf->sf_count[MCAST_EXCLUDE] != | |
2613 | im->sfcount[MCAST_EXCLUDE]; | |
2614 | else | |
2615 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2616 | } else | |
2617 | rv = 1; /* unspecified source; tentatively allow */ | |
2618 | } | |
1da177e4 LT |
2619 | return rv; |
2620 | } | |
2621 | ||
2622 | #if defined(CONFIG_PROC_FS) | |
2623 | struct igmp_mc_iter_state { | |
7091e728 | 2624 | struct seq_net_private p; |
1da177e4 LT |
2625 | struct net_device *dev; |
2626 | struct in_device *in_dev; | |
2627 | }; | |
2628 | ||
2629 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2630 | ||
2631 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2632 | { | |
7091e728 | 2633 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2634 | struct ip_mc_list *im = NULL; |
2635 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2636 | ||
7562f876 | 2637 | state->in_dev = NULL; |
61fbab77 | 2638 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2639 | struct in_device *in_dev; |
6baff150 ED |
2640 | |
2641 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2642 | if (!in_dev) |
2643 | continue; | |
1d7138de | 2644 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2645 | if (im) { |
2646 | state->in_dev = in_dev; | |
2647 | break; | |
2648 | } | |
1da177e4 LT |
2649 | } |
2650 | return im; | |
2651 | } | |
2652 | ||
2653 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2654 | { | |
2655 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2656 | |
1d7138de ED |
2657 | im = rcu_dereference(im->next_rcu); |
2658 | while (!im) { | |
6baff150 | 2659 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2660 | if (!state->dev) { |
2661 | state->in_dev = NULL; | |
2662 | break; | |
2663 | } | |
6baff150 | 2664 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2665 | if (!state->in_dev) |
2666 | continue; | |
1d7138de | 2667 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2668 | } |
2669 | return im; | |
2670 | } | |
2671 | ||
2672 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2673 | { | |
2674 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2675 | if (im) | |
2676 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2677 | --pos; | |
2678 | return pos ? NULL : im; | |
2679 | } | |
2680 | ||
2681 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2682 | __acquires(rcu) |
1da177e4 | 2683 | { |
61fbab77 | 2684 | rcu_read_lock(); |
1da177e4 LT |
2685 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2686 | } | |
2687 | ||
2688 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2689 | { | |
2690 | struct ip_mc_list *im; | |
2691 | if (v == SEQ_START_TOKEN) | |
2692 | im = igmp_mc_get_first(seq); | |
2693 | else | |
2694 | im = igmp_mc_get_next(seq, v); | |
2695 | ++*pos; | |
2696 | return im; | |
2697 | } | |
2698 | ||
2699 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2700 | __releases(rcu) |
1da177e4 LT |
2701 | { |
2702 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2703 | |
2704 | state->in_dev = NULL; | |
1da177e4 | 2705 | state->dev = NULL; |
61fbab77 | 2706 | rcu_read_unlock(); |
1da177e4 LT |
2707 | } |
2708 | ||
2709 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2710 | { | |
2711 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2712 | seq_puts(seq, |
1da177e4 LT |
2713 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2714 | else { | |
2715 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2716 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2717 | char *querier; | |
a399a805 ED |
2718 | long delta; |
2719 | ||
1da177e4 LT |
2720 | #ifdef CONFIG_IP_MULTICAST |
2721 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2722 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2723 | "V3"; | |
2724 | #else | |
2725 | querier = "NONE"; | |
2726 | #endif | |
2727 | ||
e6b68883 | 2728 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2729 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2730 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2731 | } |
2732 | ||
a399a805 | 2733 | delta = im->timer.expires - jiffies; |
1da177e4 | 2734 | seq_printf(seq, |
338fcf98 | 2735 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2736 | im->multiaddr, im->users, |
a399a805 ED |
2737 | im->tm_running, |
2738 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2739 | im->reporter); |
2740 | } | |
2741 | return 0; | |
2742 | } | |
2743 | ||
f690808e | 2744 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2745 | .start = igmp_mc_seq_start, |
2746 | .next = igmp_mc_seq_next, | |
2747 | .stop = igmp_mc_seq_stop, | |
2748 | .show = igmp_mc_seq_show, | |
2749 | }; | |
2750 | ||
2751 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2752 | { | |
7091e728 | 2753 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2754 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2755 | } |
2756 | ||
9a32144e | 2757 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2758 | .owner = THIS_MODULE, |
2759 | .open = igmp_mc_seq_open, | |
2760 | .read = seq_read, | |
2761 | .llseek = seq_lseek, | |
7091e728 | 2762 | .release = seq_release_net, |
1da177e4 LT |
2763 | }; |
2764 | ||
2765 | struct igmp_mcf_iter_state { | |
7091e728 | 2766 | struct seq_net_private p; |
1da177e4 LT |
2767 | struct net_device *dev; |
2768 | struct in_device *idev; | |
2769 | struct ip_mc_list *im; | |
2770 | }; | |
2771 | ||
2772 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2773 | ||
2774 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2775 | { | |
7091e728 | 2776 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2777 | struct ip_sf_list *psf = NULL; |
2778 | struct ip_mc_list *im = NULL; | |
2779 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2780 | ||
7562f876 PE |
2781 | state->idev = NULL; |
2782 | state->im = NULL; | |
61fbab77 | 2783 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2784 | struct in_device *idev; |
6baff150 | 2785 | idev = __in_dev_get_rcu(state->dev); |
51456b29 | 2786 | if (unlikely(!idev)) |
1da177e4 | 2787 | continue; |
1d7138de | 2788 | im = rcu_dereference(idev->mc_list); |
00db4124 | 2789 | if (likely(im)) { |
1da177e4 LT |
2790 | spin_lock_bh(&im->lock); |
2791 | psf = im->sources; | |
00db4124 | 2792 | if (likely(psf)) { |
1da177e4 LT |
2793 | state->im = im; |
2794 | state->idev = idev; | |
2795 | break; | |
2796 | } | |
2797 | spin_unlock_bh(&im->lock); | |
2798 | } | |
1da177e4 LT |
2799 | } |
2800 | return psf; | |
2801 | } | |
2802 | ||
2803 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2804 | { | |
2805 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2806 | ||
2807 | psf = psf->sf_next; | |
2808 | while (!psf) { | |
2809 | spin_unlock_bh(&state->im->lock); | |
2810 | state->im = state->im->next; | |
2811 | while (!state->im) { | |
6baff150 | 2812 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2813 | if (!state->dev) { |
2814 | state->idev = NULL; | |
2815 | goto out; | |
2816 | } | |
6baff150 | 2817 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2818 | if (!state->idev) |
2819 | continue; | |
1d7138de | 2820 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2821 | } |
2822 | if (!state->im) | |
2823 | break; | |
2824 | spin_lock_bh(&state->im->lock); | |
2825 | psf = state->im->sources; | |
2826 | } | |
2827 | out: | |
2828 | return psf; | |
2829 | } | |
2830 | ||
2831 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2832 | { | |
2833 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2834 | if (psf) | |
2835 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2836 | --pos; | |
2837 | return pos ? NULL : psf; | |
2838 | } | |
2839 | ||
2840 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2841 | __acquires(rcu) |
1da177e4 | 2842 | { |
61fbab77 | 2843 | rcu_read_lock(); |
1da177e4 LT |
2844 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2845 | } | |
2846 | ||
2847 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2848 | { | |
2849 | struct ip_sf_list *psf; | |
2850 | if (v == SEQ_START_TOKEN) | |
2851 | psf = igmp_mcf_get_first(seq); | |
2852 | else | |
2853 | psf = igmp_mcf_get_next(seq, v); | |
2854 | ++*pos; | |
2855 | return psf; | |
2856 | } | |
2857 | ||
2858 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2859 | __releases(rcu) |
1da177e4 LT |
2860 | { |
2861 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
00db4124 | 2862 | if (likely(state->im)) { |
1da177e4 LT |
2863 | spin_unlock_bh(&state->im->lock); |
2864 | state->im = NULL; | |
2865 | } | |
1d7138de | 2866 | state->idev = NULL; |
1da177e4 | 2867 | state->dev = NULL; |
61fbab77 | 2868 | rcu_read_unlock(); |
1da177e4 LT |
2869 | } |
2870 | ||
2871 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2872 | { | |
2873 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2874 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2875 | ||
2876 | if (v == SEQ_START_TOKEN) { | |
1744bea1 | 2877 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
1da177e4 LT |
2878 | } else { |
2879 | seq_printf(seq, | |
2880 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2881 | "0x%08x %6lu %6lu\n", |
2882 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2883 | ntohl(state->im->multiaddr), |
2884 | ntohl(psf->sf_inaddr), | |
2885 | psf->sf_count[MCAST_INCLUDE], | |
2886 | psf->sf_count[MCAST_EXCLUDE]); | |
2887 | } | |
2888 | return 0; | |
2889 | } | |
2890 | ||
f690808e | 2891 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2892 | .start = igmp_mcf_seq_start, |
2893 | .next = igmp_mcf_seq_next, | |
2894 | .stop = igmp_mcf_seq_stop, | |
2895 | .show = igmp_mcf_seq_show, | |
2896 | }; | |
2897 | ||
2898 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2899 | { | |
7091e728 | 2900 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2901 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2902 | } |
2903 | ||
9a32144e | 2904 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2905 | .owner = THIS_MODULE, |
2906 | .open = igmp_mcf_seq_open, | |
2907 | .read = seq_read, | |
2908 | .llseek = seq_lseek, | |
7091e728 | 2909 | .release = seq_release_net, |
1da177e4 LT |
2910 | }; |
2911 | ||
2c8c1e72 | 2912 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2913 | { |
7091e728 | 2914 | struct proc_dir_entry *pde; |
93a714d6 | 2915 | int err; |
7091e728 | 2916 | |
d4beaa66 | 2917 | pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); |
7091e728 AD |
2918 | if (!pde) |
2919 | goto out_igmp; | |
d4beaa66 G |
2920 | pde = proc_create("mcfilter", S_IRUGO, net->proc_net, |
2921 | &igmp_mcf_seq_fops); | |
7091e728 AD |
2922 | if (!pde) |
2923 | goto out_mcfilter; | |
93a714d6 MC |
2924 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
2925 | SOCK_DGRAM, 0, net); | |
2926 | if (err < 0) { | |
2927 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
2928 | err); | |
2929 | goto out_sock; | |
2930 | } | |
2931 | ||
1da177e4 | 2932 | return 0; |
7091e728 | 2933 | |
93a714d6 MC |
2934 | out_sock: |
2935 | remove_proc_entry("mcfilter", net->proc_net); | |
7091e728 | 2936 | out_mcfilter: |
ece31ffd | 2937 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
2938 | out_igmp: |
2939 | return -ENOMEM; | |
2940 | } | |
2941 | ||
2c8c1e72 | 2942 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 2943 | { |
ece31ffd G |
2944 | remove_proc_entry("mcfilter", net->proc_net); |
2945 | remove_proc_entry("igmp", net->proc_net); | |
93a714d6 | 2946 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
7091e728 AD |
2947 | } |
2948 | ||
2949 | static struct pernet_operations igmp_net_ops = { | |
2950 | .init = igmp_net_init, | |
2951 | .exit = igmp_net_exit, | |
2952 | }; | |
72c1d3bd | 2953 | #endif |
7091e728 | 2954 | |
4aa5dee4 JP |
2955 | static int igmp_netdev_event(struct notifier_block *this, |
2956 | unsigned long event, void *ptr) | |
2957 | { | |
2958 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
2959 | struct in_device *in_dev; | |
2960 | ||
2961 | switch (event) { | |
2962 | case NETDEV_RESEND_IGMP: | |
2963 | in_dev = __in_dev_get_rtnl(dev); | |
2964 | if (in_dev) | |
2965 | ip_mc_rejoin_groups(in_dev); | |
2966 | break; | |
2967 | default: | |
2968 | break; | |
2969 | } | |
2970 | return NOTIFY_DONE; | |
2971 | } | |
2972 | ||
2973 | static struct notifier_block igmp_notifier = { | |
2974 | .notifier_call = igmp_netdev_event, | |
2975 | }; | |
2976 | ||
72c1d3bd | 2977 | int __init igmp_mc_init(void) |
7091e728 | 2978 | { |
72c1d3bd | 2979 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
2980 | int err; |
2981 | ||
2982 | err = register_pernet_subsys(&igmp_net_ops); | |
2983 | if (err) | |
2984 | return err; | |
2985 | err = register_netdevice_notifier(&igmp_notifier); | |
2986 | if (err) | |
2987 | goto reg_notif_fail; | |
2988 | return 0; | |
2989 | ||
2990 | reg_notif_fail: | |
2991 | unregister_pernet_subsys(&igmp_net_ops); | |
2992 | return err; | |
72c1d3bd WC |
2993 | #else |
2994 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 2995 | #endif |
72c1d3bd | 2996 | } |