Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
3 | * | |
4 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
5 | * been a further revision of this protocol since which is now supported. | |
6 | * | |
7 | * If you have trouble with this module be careful what gcc you have used, | |
8 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
9 | * seems to fall out with gcc 2.6.2. | |
10 | * | |
1da177e4 | 11 | * Authors: |
113aa838 | 12 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
13 | * |
14 | * This program is free software; you can redistribute it and/or | |
15 | * modify it under the terms of the GNU General Public License | |
16 | * as published by the Free Software Foundation; either version | |
17 | * 2 of the License, or (at your option) any later version. | |
18 | * | |
19 | * Fixes: | |
20 | * | |
21 | * Alan Cox : Added lots of __inline__ to optimise | |
22 | * the memory usage of all the tiny little | |
23 | * functions. | |
24 | * Alan Cox : Dumped the header building experiment. | |
25 | * Alan Cox : Minor tweaks ready for multicast routing | |
26 | * and extended IGMP protocol. | |
27 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
28 | * writes utterly bogus code otherwise (sigh) | |
29 | * fixed IGMP loopback to behave in the manner | |
30 | * desired by mrouted, fixed the fact it has been | |
31 | * broken since 1.3.6 and cleaned up a few minor | |
32 | * points. | |
33 | * | |
34 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
35 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 36 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
37 | * ipmulti-3.5 source code. |
38 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
39 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
40 | * the mrouted version on that device. | |
41 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
42 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
43 | * to identify the multicast router version | |
44 | * and do what the IGMP version 2 specified. | |
45 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
46 | * Tsu-Sheng Tsao if the specified time expired. | |
47 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
48 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
49 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
50 | * memberships but was being deleted, |
51 | * which caused a "del_timer() called | |
1da177e4 LT |
52 | * from %p with timer not initialized\n" |
53 | * message (960131). | |
e905a9ed | 54 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
55 | * igmp_timer_expire function (960205). |
56 | * Christian Daudt : igmp_heard_report now only calls | |
57 | * igmp_timer_expire if tm->running is | |
58 | * true (960216). | |
59 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
60 | * igmp_heard_query never trigger. Expiry | |
61 | * miscalculation fixed in igmp_heard_query | |
62 | * and random() made to return unsigned to | |
63 | * prevent negative expiry times. | |
64 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
65 | * fix from pending 2.1.x patches. | |
66 | * Alan Cox: Forget to enable FDDI support earlier. | |
67 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
68 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
69 | * David L Stevens: IGMPv3 support, with help from | |
70 | * Vinay Kulkarni | |
71 | */ | |
72 | ||
1da177e4 | 73 | #include <linux/module.h> |
5a0e3ad6 | 74 | #include <linux/slab.h> |
1da177e4 | 75 | #include <asm/uaccess.h> |
1da177e4 LT |
76 | #include <linux/types.h> |
77 | #include <linux/kernel.h> | |
78 | #include <linux/jiffies.h> | |
79 | #include <linux/string.h> | |
80 | #include <linux/socket.h> | |
81 | #include <linux/sockios.h> | |
82 | #include <linux/in.h> | |
83 | #include <linux/inet.h> | |
84 | #include <linux/netdevice.h> | |
85 | #include <linux/skbuff.h> | |
86 | #include <linux/inetdevice.h> | |
87 | #include <linux/igmp.h> | |
88 | #include <linux/if_arp.h> | |
89 | #include <linux/rtnetlink.h> | |
90 | #include <linux/times.h> | |
9d4a0314 | 91 | #include <linux/pkt_sched.h> |
14c85021 | 92 | |
457c4cbc | 93 | #include <net/net_namespace.h> |
14c85021 | 94 | #include <net/arp.h> |
1da177e4 LT |
95 | #include <net/ip.h> |
96 | #include <net/protocol.h> | |
97 | #include <net/route.h> | |
98 | #include <net/sock.h> | |
99 | #include <net/checksum.h> | |
100 | #include <linux/netfilter_ipv4.h> | |
101 | #ifdef CONFIG_IP_MROUTE | |
102 | #include <linux/mroute.h> | |
103 | #endif | |
104 | #ifdef CONFIG_PROC_FS | |
105 | #include <linux/proc_fs.h> | |
106 | #include <linux/seq_file.h> | |
107 | #endif | |
108 | ||
109 | #define IP_MAX_MEMBERSHIPS 20 | |
110 | #define IP_MAX_MSF 10 | |
111 | ||
112 | #ifdef CONFIG_IP_MULTICAST | |
113 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
114 | ||
115 | #define IGMP_V1_Router_Present_Timeout (400*HZ) | |
116 | #define IGMP_V2_Router_Present_Timeout (400*HZ) | |
cab70040 WM |
117 | #define IGMP_V2_Unsolicited_Report_Interval (10*HZ) |
118 | #define IGMP_V3_Unsolicited_Report_Interval (1*HZ) | |
1da177e4 | 119 | #define IGMP_Query_Response_Interval (10*HZ) |
a9fe8e29 | 120 | #define IGMP_Query_Robustness_Variable 2 |
1da177e4 LT |
121 | |
122 | ||
123 | #define IGMP_Initial_Report_Delay (1) | |
124 | ||
125 | /* IGMP_Initial_Report_Delay is not from IGMP specs! | |
126 | * IGMP specs require to report membership immediately after | |
127 | * joining a group, but we delay the first report by a | |
128 | * small interval. It seems more natural and still does not | |
129 | * contradict to specs provided this delay is small enough. | |
130 | */ | |
131 | ||
42f811b8 | 132 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 133 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
134 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
135 | ((in_dev)->mr_v1_seen && \ | |
136 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
137 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 138 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
139 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
140 | ((in_dev)->mr_v2_seen && \ | |
141 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 | 142 | |
cab70040 WM |
143 | static int unsolicited_report_interval(struct in_device *in_dev) |
144 | { | |
2690048c WM |
145 | int interval_ms, interval_jiffies; |
146 | ||
cab70040 | 147 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
2690048c WM |
148 | interval_ms = IN_DEV_CONF_GET( |
149 | in_dev, | |
150 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
cab70040 | 151 | else /* v3 */ |
2690048c WM |
152 | interval_ms = IN_DEV_CONF_GET( |
153 | in_dev, | |
154 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
155 | ||
156 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
157 | ||
158 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
159 | * we always return a positive value. | |
160 | */ | |
161 | if (interval_jiffies <= 0) | |
162 | interval_jiffies = 1; | |
163 | return interval_jiffies; | |
cab70040 WM |
164 | } |
165 | ||
1da177e4 | 166 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
63007727 | 167 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr); |
1da177e4 LT |
168 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
169 | static int sf_setstate(struct ip_mc_list *pmc); | |
170 | static void sf_markstate(struct ip_mc_list *pmc); | |
171 | #endif | |
172 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
173 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
174 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
175 | |
176 | static void ip_ma_put(struct ip_mc_list *im) | |
177 | { | |
178 | if (atomic_dec_and_test(&im->refcnt)) { | |
179 | in_dev_put(im->interface); | |
42ea299d | 180 | kfree_rcu(im, rcu); |
1da177e4 LT |
181 | } |
182 | } | |
183 | ||
d9aa9380 DM |
184 | #define for_each_pmc_rcu(in_dev, pmc) \ |
185 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
186 | pmc != NULL; \ | |
187 | pmc = rcu_dereference(pmc->next_rcu)) | |
188 | ||
189 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
190 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
191 | pmc != NULL; \ | |
192 | pmc = rtnl_dereference(pmc->next_rcu)) | |
193 | ||
1da177e4 LT |
194 | #ifdef CONFIG_IP_MULTICAST |
195 | ||
196 | /* | |
197 | * Timer management | |
198 | */ | |
199 | ||
1d7138de | 200 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
201 | { |
202 | spin_lock_bh(&im->lock); | |
203 | if (del_timer(&im->timer)) | |
204 | atomic_dec(&im->refcnt); | |
a7e9ff73 | 205 | im->tm_running = 0; |
1da177e4 LT |
206 | im->reporter = 0; |
207 | im->unsolicit_count = 0; | |
208 | spin_unlock_bh(&im->lock); | |
209 | } | |
210 | ||
211 | /* It must be called with locked im->lock */ | |
212 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
213 | { | |
63862b5b | 214 | int tv = prandom_u32() % max_delay; |
1da177e4 | 215 | |
a7e9ff73 | 216 | im->tm_running = 1; |
1da177e4 LT |
217 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
218 | atomic_inc(&im->refcnt); | |
219 | } | |
220 | ||
221 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
222 | { | |
63862b5b | 223 | int tv = prandom_u32() % in_dev->mr_maxdelay; |
1da177e4 LT |
224 | |
225 | in_dev->mr_gq_running = 1; | |
226 | if (!mod_timer(&in_dev->mr_gq_timer, jiffies+tv+2)) | |
227 | in_dev_hold(in_dev); | |
228 | } | |
229 | ||
230 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
231 | { | |
63862b5b | 232 | int tv = prandom_u32() % delay; |
1da177e4 LT |
233 | |
234 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
235 | in_dev_hold(in_dev); | |
236 | } | |
237 | ||
238 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
239 | { | |
240 | spin_lock_bh(&im->lock); | |
241 | im->unsolicit_count = 0; | |
242 | if (del_timer(&im->timer)) { | |
243 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
244 | add_timer(&im->timer); | |
a7e9ff73 | 245 | im->tm_running = 1; |
1da177e4 LT |
246 | spin_unlock_bh(&im->lock); |
247 | return; | |
248 | } | |
249 | atomic_dec(&im->refcnt); | |
250 | } | |
251 | igmp_start_timer(im, max_delay); | |
252 | spin_unlock_bh(&im->lock); | |
253 | } | |
254 | ||
255 | ||
256 | /* | |
257 | * Send an IGMP report. | |
258 | */ | |
259 | ||
260 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
261 | ||
262 | ||
263 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
264 | int gdeleted, int sdeleted) | |
265 | { | |
266 | switch (type) { | |
267 | case IGMPV3_MODE_IS_INCLUDE: | |
268 | case IGMPV3_MODE_IS_EXCLUDE: | |
269 | if (gdeleted || sdeleted) | |
270 | return 0; | |
ad12583f DS |
271 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
272 | if (pmc->sfmode == MCAST_INCLUDE) | |
273 | return 1; | |
274 | /* don't include if this source is excluded | |
275 | * in all filters | |
276 | */ | |
277 | if (psf->sf_count[MCAST_INCLUDE]) | |
278 | return type == IGMPV3_MODE_IS_INCLUDE; | |
279 | return pmc->sfcount[MCAST_EXCLUDE] == | |
280 | psf->sf_count[MCAST_EXCLUDE]; | |
281 | } | |
282 | return 0; | |
1da177e4 LT |
283 | case IGMPV3_CHANGE_TO_INCLUDE: |
284 | if (gdeleted || sdeleted) | |
285 | return 0; | |
286 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
287 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
288 | if (gdeleted || sdeleted) | |
289 | return 0; | |
290 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
291 | psf->sf_count[MCAST_INCLUDE]) | |
292 | return 0; | |
293 | return pmc->sfcount[MCAST_EXCLUDE] == | |
294 | psf->sf_count[MCAST_EXCLUDE]; | |
295 | case IGMPV3_ALLOW_NEW_SOURCES: | |
296 | if (gdeleted || !psf->sf_crcount) | |
297 | return 0; | |
298 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
299 | case IGMPV3_BLOCK_OLD_SOURCES: | |
300 | if (pmc->sfmode == MCAST_INCLUDE) | |
301 | return gdeleted || (psf->sf_crcount && sdeleted); | |
302 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
303 | } | |
304 | return 0; | |
305 | } | |
306 | ||
307 | static int | |
308 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
309 | { | |
310 | struct ip_sf_list *psf; | |
311 | int scount = 0; | |
312 | ||
c71151f0 | 313 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
314 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
315 | continue; | |
316 | scount++; | |
317 | } | |
318 | return scount; | |
319 | } | |
320 | ||
feb91a02 | 321 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
1da177e4 LT |
322 | { |
323 | struct sk_buff *skb; | |
324 | struct rtable *rt; | |
325 | struct iphdr *pip; | |
326 | struct igmpv3_report *pig; | |
877acedc | 327 | struct net *net = dev_net(dev); |
31e4543d | 328 | struct flowi4 fl4; |
66088243 HX |
329 | int hlen = LL_RESERVED_SPACE(dev); |
330 | int tlen = dev->needed_tailroom; | |
feb91a02 | 331 | unsigned int size = mtu; |
1da177e4 | 332 | |
57e1ab6e | 333 | while (1) { |
66088243 | 334 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
335 | GFP_ATOMIC | __GFP_NOWARN); |
336 | if (skb) | |
337 | break; | |
338 | size >>= 1; | |
339 | if (size < 256) | |
340 | return NULL; | |
341 | } | |
9d4a0314 | 342 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 343 | |
31e4543d | 344 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
345 | 0, 0, |
346 | IPPROTO_IGMP, 0, dev->ifindex); | |
347 | if (IS_ERR(rt)) { | |
348 | kfree_skb(skb); | |
349 | return NULL; | |
1da177e4 | 350 | } |
1da177e4 | 351 | |
d8d1f30b | 352 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
353 | skb->dev = dev; |
354 | ||
feb91a02 DB |
355 | skb->reserved_tailroom = skb_end_offset(skb) - |
356 | min(mtu, skb_end_offset(skb)); | |
66088243 | 357 | skb_reserve(skb, hlen); |
1da177e4 | 358 | |
7e28ecc2 | 359 | skb_reset_network_header(skb); |
eddc9ec5 | 360 | pip = ip_hdr(skb); |
7e28ecc2 | 361 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
362 | |
363 | pip->version = 4; | |
364 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
365 | pip->tos = 0xc0; | |
366 | pip->frag_off = htons(IP_DF); | |
367 | pip->ttl = 1; | |
492f64ce DM |
368 | pip->daddr = fl4.daddr; |
369 | pip->saddr = fl4.saddr; | |
1da177e4 LT |
370 | pip->protocol = IPPROTO_IGMP; |
371 | pip->tot_len = 0; /* filled in later */ | |
73f156a6 | 372 | ip_select_ident(skb, NULL); |
5e73ea1a DB |
373 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
374 | ((u8 *)&pip[1])[1] = 4; | |
375 | ((u8 *)&pip[1])[2] = 0; | |
376 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 377 | |
b0e380b1 | 378 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 379 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 380 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
381 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
382 | pig->resv1 = 0; | |
383 | pig->csum = 0; | |
384 | pig->resv2 = 0; | |
385 | pig->ngrec = 0; | |
386 | return skb; | |
387 | } | |
388 | ||
389 | static int igmpv3_sendpack(struct sk_buff *skb) | |
390 | { | |
d9edf9e2 | 391 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 392 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 393 | |
d9edf9e2 | 394 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 395 | |
c439cb2e | 396 | return ip_local_out(skb); |
1da177e4 LT |
397 | } |
398 | ||
399 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
400 | { | |
a7e9ff73 | 401 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
402 | } |
403 | ||
404 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
405 | int type, struct igmpv3_grec **ppgr) | |
406 | { | |
407 | struct net_device *dev = pmc->interface->dev; | |
408 | struct igmpv3_report *pih; | |
409 | struct igmpv3_grec *pgr; | |
410 | ||
411 | if (!skb) | |
412 | skb = igmpv3_newpack(dev, dev->mtu); | |
413 | if (!skb) | |
414 | return NULL; | |
415 | pgr = (struct igmpv3_grec *)skb_put(skb, sizeof(struct igmpv3_grec)); | |
416 | pgr->grec_type = type; | |
417 | pgr->grec_auxwords = 0; | |
418 | pgr->grec_nsrcs = 0; | |
419 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 420 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
421 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
422 | *ppgr = pgr; | |
423 | return skb; | |
424 | } | |
425 | ||
feb91a02 | 426 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
427 | |
428 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
429 | int type, int gdeleted, int sdeleted) | |
430 | { | |
431 | struct net_device *dev = pmc->interface->dev; | |
432 | struct igmpv3_report *pih; | |
433 | struct igmpv3_grec *pgr = NULL; | |
434 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 435 | int scount, stotal, first, isquery, truncate; |
1da177e4 LT |
436 | |
437 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
438 | return skb; | |
439 | ||
440 | isquery = type == IGMPV3_MODE_IS_INCLUDE || | |
441 | type == IGMPV3_MODE_IS_EXCLUDE; | |
442 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
443 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
444 | ||
ad12583f DS |
445 | stotal = scount = 0; |
446 | ||
1da177e4 LT |
447 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
448 | ||
ad12583f DS |
449 | if (!*psf_list) |
450 | goto empty_source; | |
451 | ||
d9edf9e2 | 452 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
453 | |
454 | /* EX and TO_EX get a fresh packet, if needed */ | |
455 | if (truncate) { | |
456 | if (pih && pih->ngrec && | |
457 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
458 | if (skb) | |
459 | igmpv3_sendpack(skb); | |
460 | skb = igmpv3_newpack(dev, dev->mtu); | |
461 | } | |
462 | } | |
463 | first = 1; | |
1da177e4 | 464 | psf_prev = NULL; |
c71151f0 | 465 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 466 | __be32 *psrc; |
1da177e4 LT |
467 | |
468 | psf_next = psf->sf_next; | |
469 | ||
470 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
471 | psf_prev = psf; | |
472 | continue; | |
473 | } | |
474 | ||
475 | /* clear marks on query responses */ | |
476 | if (isquery) | |
477 | psf->sf_gsresp = 0; | |
478 | ||
63007727 | 479 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
480 | first*sizeof(struct igmpv3_grec)) { |
481 | if (truncate && !first) | |
482 | break; /* truncate these */ | |
483 | if (pgr) | |
484 | pgr->grec_nsrcs = htons(scount); | |
485 | if (skb) | |
486 | igmpv3_sendpack(skb); | |
487 | skb = igmpv3_newpack(dev, dev->mtu); | |
488 | first = 1; | |
489 | scount = 0; | |
490 | } | |
491 | if (first) { | |
492 | skb = add_grhead(skb, pmc, type, &pgr); | |
493 | first = 0; | |
494 | } | |
cc63f70b AD |
495 | if (!skb) |
496 | return NULL; | |
63007727 | 497 | psrc = (__be32 *)skb_put(skb, sizeof(__be32)); |
1da177e4 | 498 | *psrc = psf->sf_inaddr; |
ad12583f | 499 | scount++; stotal++; |
1da177e4 LT |
500 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
501 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
502 | psf->sf_crcount--; | |
503 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
504 | if (psf_prev) | |
505 | psf_prev->sf_next = psf->sf_next; | |
506 | else | |
507 | *psf_list = psf->sf_next; | |
508 | kfree(psf); | |
509 | continue; | |
510 | } | |
511 | } | |
512 | psf_prev = psf; | |
513 | } | |
ad12583f DS |
514 | |
515 | empty_source: | |
516 | if (!stotal) { | |
517 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
518 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
519 | return skb; | |
520 | if (pmc->crcount || isquery) { | |
521 | /* make sure we have room for group header */ | |
c71151f0 | 522 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
523 | igmpv3_sendpack(skb); |
524 | skb = NULL; /* add_grhead will get a new one */ | |
525 | } | |
526 | skb = add_grhead(skb, pmc, type, &pgr); | |
527 | } | |
528 | } | |
1da177e4 LT |
529 | if (pgr) |
530 | pgr->grec_nsrcs = htons(scount); | |
531 | ||
532 | if (isquery) | |
533 | pmc->gsquery = 0; /* clear query state on report */ | |
534 | return skb; | |
535 | } | |
536 | ||
537 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
538 | { | |
539 | struct sk_buff *skb = NULL; | |
540 | int type; | |
541 | ||
542 | if (!pmc) { | |
1d7138de ED |
543 | rcu_read_lock(); |
544 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
545 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
546 | continue; | |
547 | spin_lock_bh(&pmc->lock); | |
548 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
549 | type = IGMPV3_MODE_IS_EXCLUDE; | |
550 | else | |
551 | type = IGMPV3_MODE_IS_INCLUDE; | |
552 | skb = add_grec(skb, pmc, type, 0, 0); | |
553 | spin_unlock_bh(&pmc->lock); | |
554 | } | |
1d7138de | 555 | rcu_read_unlock(); |
1da177e4 LT |
556 | } else { |
557 | spin_lock_bh(&pmc->lock); | |
558 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
559 | type = IGMPV3_MODE_IS_EXCLUDE; | |
560 | else | |
561 | type = IGMPV3_MODE_IS_INCLUDE; | |
562 | skb = add_grec(skb, pmc, type, 0, 0); | |
563 | spin_unlock_bh(&pmc->lock); | |
564 | } | |
565 | if (!skb) | |
566 | return 0; | |
567 | return igmpv3_sendpack(skb); | |
568 | } | |
569 | ||
570 | /* | |
571 | * remove zero-count source records from a source filter list | |
572 | */ | |
573 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
574 | { | |
575 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
576 | ||
577 | psf_prev = NULL; | |
c71151f0 | 578 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
579 | psf_next = psf->sf_next; |
580 | if (psf->sf_crcount == 0) { | |
581 | if (psf_prev) | |
582 | psf_prev->sf_next = psf->sf_next; | |
583 | else | |
584 | *ppsf = psf->sf_next; | |
585 | kfree(psf); | |
586 | } else | |
587 | psf_prev = psf; | |
588 | } | |
589 | } | |
590 | ||
591 | static void igmpv3_send_cr(struct in_device *in_dev) | |
592 | { | |
593 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
594 | struct sk_buff *skb = NULL; | |
595 | int type, dtype; | |
596 | ||
1d7138de | 597 | rcu_read_lock(); |
1da177e4 LT |
598 | spin_lock_bh(&in_dev->mc_tomb_lock); |
599 | ||
600 | /* deleted MCA's */ | |
601 | pmc_prev = NULL; | |
c71151f0 | 602 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
603 | pmc_next = pmc->next; |
604 | if (pmc->sfmode == MCAST_INCLUDE) { | |
605 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
606 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
607 | skb = add_grec(skb, pmc, type, 1, 0); | |
608 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
609 | } | |
610 | if (pmc->crcount) { | |
1da177e4 LT |
611 | if (pmc->sfmode == MCAST_EXCLUDE) { |
612 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
613 | skb = add_grec(skb, pmc, type, 1, 0); | |
614 | } | |
ad12583f | 615 | pmc->crcount--; |
1da177e4 LT |
616 | if (pmc->crcount == 0) { |
617 | igmpv3_clear_zeros(&pmc->tomb); | |
618 | igmpv3_clear_zeros(&pmc->sources); | |
619 | } | |
620 | } | |
621 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
622 | if (pmc_prev) | |
623 | pmc_prev->next = pmc_next; | |
624 | else | |
625 | in_dev->mc_tomb = pmc_next; | |
626 | in_dev_put(pmc->interface); | |
627 | kfree(pmc); | |
628 | } else | |
629 | pmc_prev = pmc; | |
630 | } | |
631 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
632 | ||
633 | /* change recs */ | |
1d7138de | 634 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
635 | spin_lock_bh(&pmc->lock); |
636 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
637 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
638 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
639 | } else { | |
640 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
641 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
642 | } | |
643 | skb = add_grec(skb, pmc, type, 0, 0); | |
644 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
645 | ||
646 | /* filter mode changes */ | |
647 | if (pmc->crcount) { | |
1da177e4 LT |
648 | if (pmc->sfmode == MCAST_EXCLUDE) |
649 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
650 | else | |
651 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
652 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 653 | pmc->crcount--; |
1da177e4 LT |
654 | } |
655 | spin_unlock_bh(&pmc->lock); | |
656 | } | |
1d7138de | 657 | rcu_read_unlock(); |
1da177e4 LT |
658 | |
659 | if (!skb) | |
660 | return; | |
661 | (void) igmpv3_sendpack(skb); | |
662 | } | |
663 | ||
664 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
665 | int type) | |
666 | { | |
667 | struct sk_buff *skb; | |
668 | struct iphdr *iph; | |
669 | struct igmphdr *ih; | |
670 | struct rtable *rt; | |
671 | struct net_device *dev = in_dev->dev; | |
877acedc | 672 | struct net *net = dev_net(dev); |
63007727 | 673 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 674 | struct flowi4 fl4; |
63007727 | 675 | __be32 dst; |
66088243 | 676 | int hlen, tlen; |
1da177e4 LT |
677 | |
678 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
679 | return igmpv3_send_report(in_dev, pmc); | |
680 | else if (type == IGMP_HOST_LEAVE_MESSAGE) | |
681 | dst = IGMP_ALL_ROUTER; | |
682 | else | |
683 | dst = group; | |
684 | ||
31e4543d | 685 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
686 | 0, 0, |
687 | IPPROTO_IGMP, 0, dev->ifindex); | |
688 | if (IS_ERR(rt)) | |
689 | return -1; | |
690 | ||
66088243 HX |
691 | hlen = LL_RESERVED_SPACE(dev); |
692 | tlen = dev->needed_tailroom; | |
693 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
1da177e4 LT |
694 | if (skb == NULL) { |
695 | ip_rt_put(rt); | |
696 | return -1; | |
697 | } | |
9d4a0314 | 698 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 699 | |
d8d1f30b | 700 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 701 | |
66088243 | 702 | skb_reserve(skb, hlen); |
1da177e4 | 703 | |
7e28ecc2 | 704 | skb_reset_network_header(skb); |
eddc9ec5 | 705 | iph = ip_hdr(skb); |
7e28ecc2 | 706 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
707 | |
708 | iph->version = 4; | |
709 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
710 | iph->tos = 0xc0; | |
711 | iph->frag_off = htons(IP_DF); | |
712 | iph->ttl = 1; | |
713 | iph->daddr = dst; | |
492f64ce | 714 | iph->saddr = fl4.saddr; |
1da177e4 | 715 | iph->protocol = IPPROTO_IGMP; |
73f156a6 | 716 | ip_select_ident(skb, NULL); |
5e73ea1a DB |
717 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
718 | ((u8 *)&iph[1])[1] = 4; | |
719 | ((u8 *)&iph[1])[2] = 0; | |
720 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 LT |
721 | |
722 | ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr)); | |
a7e9ff73 JK |
723 | ih->type = type; |
724 | ih->code = 0; | |
725 | ih->csum = 0; | |
726 | ih->group = group; | |
727 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 728 | |
c439cb2e | 729 | return ip_local_out(skb); |
1da177e4 LT |
730 | } |
731 | ||
732 | static void igmp_gq_timer_expire(unsigned long data) | |
733 | { | |
734 | struct in_device *in_dev = (struct in_device *)data; | |
735 | ||
736 | in_dev->mr_gq_running = 0; | |
737 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 738 | in_dev_put(in_dev); |
1da177e4 LT |
739 | } |
740 | ||
741 | static void igmp_ifc_timer_expire(unsigned long data) | |
742 | { | |
743 | struct in_device *in_dev = (struct in_device *)data; | |
744 | ||
745 | igmpv3_send_cr(in_dev); | |
746 | if (in_dev->mr_ifc_count) { | |
747 | in_dev->mr_ifc_count--; | |
cab70040 WM |
748 | igmp_ifc_start_timer(in_dev, |
749 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 750 | } |
e2401654 | 751 | in_dev_put(in_dev); |
1da177e4 LT |
752 | } |
753 | ||
754 | static void igmp_ifc_event(struct in_device *in_dev) | |
755 | { | |
756 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) | |
757 | return; | |
a9fe8e29 | 758 | in_dev->mr_ifc_count = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
759 | igmp_ifc_start_timer(in_dev, 1); |
760 | } | |
761 | ||
762 | ||
763 | static void igmp_timer_expire(unsigned long data) | |
764 | { | |
c71151f0 | 765 | struct ip_mc_list *im = (struct ip_mc_list *)data; |
1da177e4 LT |
766 | struct in_device *in_dev = im->interface; |
767 | ||
768 | spin_lock(&im->lock); | |
a7e9ff73 | 769 | im->tm_running = 0; |
1da177e4 LT |
770 | |
771 | if (im->unsolicit_count) { | |
772 | im->unsolicit_count--; | |
cab70040 | 773 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
1da177e4 LT |
774 | } |
775 | im->reporter = 1; | |
776 | spin_unlock(&im->lock); | |
777 | ||
778 | if (IGMP_V1_SEEN(in_dev)) | |
779 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
780 | else if (IGMP_V2_SEEN(in_dev)) | |
781 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
782 | else | |
783 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
784 | ||
785 | ip_ma_put(im); | |
786 | } | |
787 | ||
ad12583f | 788 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 789 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
790 | { |
791 | struct ip_sf_list *psf; | |
792 | int i, scount; | |
793 | ||
ad12583f | 794 | scount = 0; |
c71151f0 | 795 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
796 | if (scount == nsrcs) |
797 | break; | |
c71151f0 | 798 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 799 | /* skip inactive filters */ |
e05c4ad3 | 800 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
801 | pmc->sfcount[MCAST_EXCLUDE] != |
802 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 803 | break; |
ad12583f DS |
804 | if (srcs[i] == psf->sf_inaddr) { |
805 | scount++; | |
806 | break; | |
807 | } | |
808 | } | |
809 | } | |
810 | pmc->gsquery = 0; | |
811 | if (scount == nsrcs) /* all sources excluded */ | |
812 | return 0; | |
813 | return 1; | |
814 | } | |
815 | ||
ea4d9e72 | 816 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
817 | { |
818 | struct ip_sf_list *psf; | |
819 | int i, scount; | |
820 | ||
821 | if (pmc->sfmode == MCAST_EXCLUDE) | |
822 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
823 | ||
824 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 825 | scount = 0; |
c71151f0 | 826 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
827 | if (scount == nsrcs) |
828 | break; | |
c71151f0 | 829 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
830 | if (srcs[i] == psf->sf_inaddr) { |
831 | psf->sf_gsresp = 1; | |
832 | scount++; | |
833 | break; | |
834 | } | |
835 | } | |
ad12583f DS |
836 | if (!scount) { |
837 | pmc->gsquery = 0; | |
838 | return 0; | |
839 | } | |
840 | pmc->gsquery = 1; | |
841 | return 1; | |
1da177e4 LT |
842 | } |
843 | ||
d679c532 ED |
844 | /* return true if packet was dropped */ |
845 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
846 | { |
847 | struct ip_mc_list *im; | |
848 | ||
849 | /* Timers are only set for non-local groups */ | |
850 | ||
851 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 852 | return false; |
1da177e4 | 853 | |
1d7138de ED |
854 | rcu_read_lock(); |
855 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
856 | if (im->multiaddr == group) { |
857 | igmp_stop_timer(im); | |
858 | break; | |
859 | } | |
860 | } | |
1d7138de | 861 | rcu_read_unlock(); |
d679c532 | 862 | return false; |
1da177e4 LT |
863 | } |
864 | ||
d679c532 ED |
865 | /* return true if packet was dropped */ |
866 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
867 | int len) |
868 | { | |
d9edf9e2 ACM |
869 | struct igmphdr *ih = igmp_hdr(skb); |
870 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 871 | struct ip_mc_list *im; |
63007727 | 872 | __be32 group = ih->group; |
1da177e4 LT |
873 | int max_delay; |
874 | int mark = 0; | |
875 | ||
876 | ||
5b7c8406 | 877 | if (len == 8) { |
1da177e4 LT |
878 | if (ih->code == 0) { |
879 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 880 | |
1da177e4 LT |
881 | max_delay = IGMP_Query_Response_Interval; |
882 | in_dev->mr_v1_seen = jiffies + | |
883 | IGMP_V1_Router_Present_Timeout; | |
884 | group = 0; | |
885 | } else { | |
886 | /* v2 router present */ | |
887 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
888 | in_dev->mr_v2_seen = jiffies + | |
889 | IGMP_V2_Router_Present_Timeout; | |
890 | } | |
891 | /* cancel the interface change timer */ | |
892 | in_dev->mr_ifc_count = 0; | |
893 | if (del_timer(&in_dev->mr_ifc_timer)) | |
894 | __in_dev_put(in_dev); | |
895 | /* clear deleted report items */ | |
896 | igmpv3_clear_delrec(in_dev); | |
897 | } else if (len < 12) { | |
d679c532 | 898 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
899 | } else if (IGMP_V1_SEEN(in_dev)) { |
900 | /* This is a v3 query with v1 queriers present */ | |
901 | max_delay = IGMP_Query_Response_Interval; | |
902 | group = 0; | |
903 | } else if (IGMP_V2_SEEN(in_dev)) { | |
904 | /* this is a v3 query with v2 queriers present; | |
905 | * Interpretation of the max_delay code is problematic here. | |
906 | * A real v2 host would use ih_code directly, while v3 has a | |
907 | * different encoding. We use the v3 encoding as more likely | |
908 | * to be intended in a v3 query. | |
909 | */ | |
910 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
911 | if (!max_delay) |
912 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
913 | } else { /* v3 */ |
914 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 915 | return true; |
e905a9ed | 916 | |
d9edf9e2 | 917 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 918 | if (ih3->nsrcs) { |
e905a9ed | 919 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 920 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 921 | return true; |
d9edf9e2 | 922 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
923 | } |
924 | ||
925 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
926 | if (!max_delay) | |
927 | max_delay = 1; /* can't mod w/ 0 */ | |
928 | in_dev->mr_maxdelay = max_delay; | |
929 | if (ih3->qrv) | |
930 | in_dev->mr_qrv = ih3->qrv; | |
931 | if (!group) { /* general query */ | |
932 | if (ih3->nsrcs) | |
b47bd8d2 | 933 | return true; /* no sources allowed */ |
1da177e4 | 934 | igmp_gq_start_timer(in_dev); |
d679c532 | 935 | return false; |
1da177e4 LT |
936 | } |
937 | /* mark sources to include, if group & source-specific */ | |
938 | mark = ih3->nsrcs != 0; | |
939 | } | |
940 | ||
941 | /* | |
942 | * - Start the timers in all of our membership records | |
943 | * that the query applies to for the interface on | |
944 | * which the query arrived excl. those that belong | |
945 | * to a "local" group (224.0.0.X) | |
946 | * - For timers already running check if they need to | |
947 | * be reset. | |
948 | * - Use the igmp->igmp_code field as the maximum | |
949 | * delay possible | |
950 | */ | |
1d7138de ED |
951 | rcu_read_lock(); |
952 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
953 | int changed; |
954 | ||
1da177e4 LT |
955 | if (group && group != im->multiaddr) |
956 | continue; | |
957 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
958 | continue; | |
959 | spin_lock_bh(&im->lock); | |
960 | if (im->tm_running) | |
961 | im->gsquery = im->gsquery && mark; | |
962 | else | |
963 | im->gsquery = mark; | |
ad12583f | 964 | changed = !im->gsquery || |
e905a9ed | 965 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 966 | spin_unlock_bh(&im->lock); |
ad12583f DS |
967 | if (changed) |
968 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 969 | } |
1d7138de | 970 | rcu_read_unlock(); |
d679c532 | 971 | return false; |
1da177e4 LT |
972 | } |
973 | ||
9a57a9d2 | 974 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
975 | int igmp_rcv(struct sk_buff *skb) |
976 | { | |
977 | /* This basically follows the spec line by line -- see RFC1112 */ | |
978 | struct igmphdr *ih; | |
9a57a9d2 | 979 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); |
1da177e4 | 980 | int len = skb->len; |
d679c532 | 981 | bool dropped = true; |
1da177e4 | 982 | |
cd557bc1 DL |
983 | if (in_dev == NULL) |
984 | goto drop; | |
1da177e4 | 985 | |
fb286bb2 | 986 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 987 | goto drop; |
fb286bb2 | 988 | |
de08dc1a TH |
989 | if (skb_checksum_simple_validate(skb)) |
990 | goto drop; | |
1da177e4 | 991 | |
d9edf9e2 | 992 | ih = igmp_hdr(skb); |
1da177e4 LT |
993 | switch (ih->type) { |
994 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 995 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
996 | break; |
997 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
998 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 999 | /* Is it our report looped back? */ |
c7537967 | 1000 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1001 | break; |
24c69275 DS |
1002 | /* don't rely on MC router hearing unicast reports */ |
1003 | if (skb->pkt_type == PACKET_MULTICAST || | |
1004 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1005 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1006 | break; |
1007 | case IGMP_PIM: | |
1008 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1009 | return pim_rcv_v1(skb); |
1010 | #endif | |
c6b471e6 | 1011 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1012 | case IGMP_DVMRP: |
1013 | case IGMP_TRACE: | |
1014 | case IGMP_HOST_LEAVE_MESSAGE: | |
1015 | case IGMP_MTRACE: | |
1016 | case IGMP_MTRACE_RESP: | |
1017 | break; | |
1018 | default: | |
dd1c1853 | 1019 | break; |
1da177e4 | 1020 | } |
fb286bb2 | 1021 | |
cd557bc1 | 1022 | drop: |
d679c532 ED |
1023 | if (dropped) |
1024 | kfree_skb(skb); | |
1025 | else | |
1026 | consume_skb(skb); | |
1da177e4 LT |
1027 | return 0; |
1028 | } | |
1029 | ||
1030 | #endif | |
1031 | ||
1032 | ||
1033 | /* | |
1034 | * Add a filter to a device | |
1035 | */ | |
1036 | ||
63007727 | 1037 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1038 | { |
1039 | char buf[MAX_ADDR_LEN]; | |
1040 | struct net_device *dev = in_dev->dev; | |
1041 | ||
1042 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1043 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1044 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1045 | routine. Something sort of: |
1046 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1047 | --ANK | |
1048 | */ | |
1049 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1050 | dev_mc_add(dev, buf); |
1da177e4 LT |
1051 | } |
1052 | ||
1053 | /* | |
1054 | * Remove a filter from a device | |
1055 | */ | |
1056 | ||
63007727 | 1057 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1058 | { |
1059 | char buf[MAX_ADDR_LEN]; | |
1060 | struct net_device *dev = in_dev->dev; | |
1061 | ||
1062 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1063 | dev_mc_del(dev, buf); |
1da177e4 LT |
1064 | } |
1065 | ||
1066 | #ifdef CONFIG_IP_MULTICAST | |
1067 | /* | |
1068 | * deleted ip_mc_list manipulation | |
1069 | */ | |
1070 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1071 | { | |
1072 | struct ip_mc_list *pmc; | |
1073 | ||
1074 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1075 | * are actually used. In particular, the refcnt and users are not | |
1076 | * used for management of the delete list. Using the same structure | |
1077 | * for deleted items allows change reports to use common code with | |
1078 | * non-deleted or query-response MCA's. | |
1079 | */ | |
0da974f4 | 1080 | pmc = kzalloc(sizeof(*pmc), GFP_KERNEL); |
1da177e4 LT |
1081 | if (!pmc) |
1082 | return; | |
1da177e4 LT |
1083 | spin_lock_bh(&im->lock); |
1084 | pmc->interface = im->interface; | |
1085 | in_dev_hold(in_dev); | |
1086 | pmc->multiaddr = im->multiaddr; | |
a9fe8e29 | 1087 | pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
1088 | pmc->sfmode = im->sfmode; |
1089 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1090 | struct ip_sf_list *psf; | |
1091 | ||
1092 | pmc->tomb = im->tomb; | |
1093 | pmc->sources = im->sources; | |
1094 | im->tomb = im->sources = NULL; | |
c71151f0 | 1095 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1096 | psf->sf_crcount = pmc->crcount; |
1097 | } | |
1098 | spin_unlock_bh(&im->lock); | |
1099 | ||
1100 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1101 | pmc->next = in_dev->mc_tomb; | |
1102 | in_dev->mc_tomb = pmc; | |
1103 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1104 | } | |
1105 | ||
63007727 | 1106 | static void igmpv3_del_delrec(struct in_device *in_dev, __be32 multiaddr) |
1da177e4 LT |
1107 | { |
1108 | struct ip_mc_list *pmc, *pmc_prev; | |
1109 | struct ip_sf_list *psf, *psf_next; | |
1110 | ||
1111 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1112 | pmc_prev = NULL; | |
c71151f0 | 1113 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1114 | if (pmc->multiaddr == multiaddr) |
1115 | break; | |
1116 | pmc_prev = pmc; | |
1117 | } | |
1118 | if (pmc) { | |
1119 | if (pmc_prev) | |
1120 | pmc_prev->next = pmc->next; | |
1121 | else | |
1122 | in_dev->mc_tomb = pmc->next; | |
1123 | } | |
1124 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1125 | if (pmc) { | |
c71151f0 | 1126 | for (psf = pmc->tomb; psf; psf = psf_next) { |
1da177e4 LT |
1127 | psf_next = psf->sf_next; |
1128 | kfree(psf); | |
1129 | } | |
1130 | in_dev_put(pmc->interface); | |
1131 | kfree(pmc); | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | static void igmpv3_clear_delrec(struct in_device *in_dev) | |
1136 | { | |
1137 | struct ip_mc_list *pmc, *nextpmc; | |
1138 | ||
1139 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1140 | pmc = in_dev->mc_tomb; | |
1141 | in_dev->mc_tomb = NULL; | |
1142 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1143 | ||
1144 | for (; pmc; pmc = nextpmc) { | |
1145 | nextpmc = pmc->next; | |
1146 | ip_mc_clear_src(pmc); | |
1147 | in_dev_put(pmc->interface); | |
1148 | kfree(pmc); | |
1149 | } | |
1150 | /* clear dead sources, too */ | |
1d7138de ED |
1151 | rcu_read_lock(); |
1152 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1153 | struct ip_sf_list *psf, *psf_next; |
1154 | ||
1155 | spin_lock_bh(&pmc->lock); | |
1156 | psf = pmc->tomb; | |
1157 | pmc->tomb = NULL; | |
1158 | spin_unlock_bh(&pmc->lock); | |
c71151f0 | 1159 | for (; psf; psf = psf_next) { |
1da177e4 LT |
1160 | psf_next = psf->sf_next; |
1161 | kfree(psf); | |
1162 | } | |
1163 | } | |
1d7138de | 1164 | rcu_read_unlock(); |
1da177e4 LT |
1165 | } |
1166 | #endif | |
1167 | ||
1168 | static void igmp_group_dropped(struct ip_mc_list *im) | |
1169 | { | |
1170 | struct in_device *in_dev = im->interface; | |
1171 | #ifdef CONFIG_IP_MULTICAST | |
1172 | int reporter; | |
1173 | #endif | |
1174 | ||
1175 | if (im->loaded) { | |
1176 | im->loaded = 0; | |
1177 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1178 | } | |
1179 | ||
1180 | #ifdef CONFIG_IP_MULTICAST | |
1181 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1182 | return; | |
1183 | ||
1184 | reporter = im->reporter; | |
1185 | igmp_stop_timer(im); | |
1186 | ||
1187 | if (!in_dev->dead) { | |
1188 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1189 | return; |
1da177e4 LT |
1190 | if (IGMP_V2_SEEN(in_dev)) { |
1191 | if (reporter) | |
1192 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1193 | return; |
1da177e4 LT |
1194 | } |
1195 | /* IGMPv3 */ | |
1196 | igmpv3_add_delrec(in_dev, im); | |
1197 | ||
1198 | igmp_ifc_event(in_dev); | |
1199 | } | |
1da177e4 | 1200 | #endif |
1da177e4 LT |
1201 | } |
1202 | ||
1203 | static void igmp_group_added(struct ip_mc_list *im) | |
1204 | { | |
1205 | struct in_device *in_dev = im->interface; | |
1206 | ||
1207 | if (im->loaded == 0) { | |
1208 | im->loaded = 1; | |
1209 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1210 | } | |
1211 | ||
1212 | #ifdef CONFIG_IP_MULTICAST | |
1213 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1214 | return; | |
1215 | ||
1216 | if (in_dev->dead) | |
1217 | return; | |
1218 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { | |
1219 | spin_lock_bh(&im->lock); | |
1220 | igmp_start_timer(im, IGMP_Initial_Report_Delay); | |
1221 | spin_unlock_bh(&im->lock); | |
1222 | return; | |
1223 | } | |
1224 | /* else, v3 */ | |
1225 | ||
a9fe8e29 | 1226 | im->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
1227 | igmp_ifc_event(in_dev); |
1228 | #endif | |
1229 | } | |
1230 | ||
1231 | ||
1232 | /* | |
1233 | * Multicast list managers | |
1234 | */ | |
1235 | ||
e9897071 ED |
1236 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1237 | { | |
c70eba74 | 1238 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1239 | } |
1240 | ||
1241 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1242 | struct ip_mc_list *im) | |
1243 | { | |
1244 | struct ip_mc_list __rcu **mc_hash; | |
1245 | u32 hash; | |
1246 | ||
1247 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1248 | if (mc_hash) { | |
1249 | hash = ip_mc_hash(im); | |
c70eba74 | 1250 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1251 | rcu_assign_pointer(mc_hash[hash], im); |
1252 | return; | |
1253 | } | |
1254 | ||
1255 | /* do not use a hash table for small number of items */ | |
1256 | if (in_dev->mc_count < 4) | |
1257 | return; | |
1258 | ||
1259 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1260 | GFP_KERNEL); | |
1261 | if (!mc_hash) | |
1262 | return; | |
1263 | ||
1264 | for_each_pmc_rtnl(in_dev, im) { | |
1265 | hash = ip_mc_hash(im); | |
c70eba74 | 1266 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1267 | RCU_INIT_POINTER(mc_hash[hash], im); |
1268 | } | |
1269 | ||
1270 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1271 | } | |
1272 | ||
1273 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1274 | struct ip_mc_list *im) | |
1275 | { | |
1276 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1277 | struct ip_mc_list *aux; | |
1278 | ||
1279 | if (!mc_hash) | |
1280 | return; | |
1281 | mc_hash += ip_mc_hash(im); | |
1282 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1283 | mc_hash = &aux->next_hash; | |
1284 | *mc_hash = im->next_hash; | |
1285 | } | |
1286 | ||
1da177e4 LT |
1287 | |
1288 | /* | |
1289 | * A socket has joined a multicast group on device dev. | |
1290 | */ | |
1291 | ||
8f935bbd | 1292 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1293 | { |
1294 | struct ip_mc_list *im; | |
1295 | ||
1296 | ASSERT_RTNL(); | |
1297 | ||
1d7138de | 1298 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1299 | if (im->multiaddr == addr) { |
1300 | im->users++; | |
1301 | ip_mc_add_src(in_dev, &addr, MCAST_EXCLUDE, 0, NULL, 0); | |
1302 | goto out; | |
1303 | } | |
1304 | } | |
1305 | ||
1d7138de | 1306 | im = kzalloc(sizeof(*im), GFP_KERNEL); |
1da177e4 LT |
1307 | if (!im) |
1308 | goto out; | |
1309 | ||
a7e9ff73 JK |
1310 | im->users = 1; |
1311 | im->interface = in_dev; | |
1da177e4 | 1312 | in_dev_hold(in_dev); |
a7e9ff73 | 1313 | im->multiaddr = addr; |
1da177e4 LT |
1314 | /* initial mode is (EX, empty) */ |
1315 | im->sfmode = MCAST_EXCLUDE; | |
1da177e4 | 1316 | im->sfcount[MCAST_EXCLUDE] = 1; |
1da177e4 LT |
1317 | atomic_set(&im->refcnt, 1); |
1318 | spin_lock_init(&im->lock); | |
1319 | #ifdef CONFIG_IP_MULTICAST | |
179542a5 | 1320 | setup_timer(&im->timer, igmp_timer_expire, (unsigned long)im); |
a9fe8e29 | 1321 | im->unsolicit_count = sysctl_igmp_qrv; |
1da177e4 | 1322 | #endif |
1d7138de ED |
1323 | |
1324 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1325 | in_dev->mc_count++; |
cf778b00 | 1326 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1327 | |
e9897071 ED |
1328 | ip_mc_hash_add(in_dev, im); |
1329 | ||
1da177e4 LT |
1330 | #ifdef CONFIG_IP_MULTICAST |
1331 | igmpv3_del_delrec(in_dev, im->multiaddr); | |
1332 | #endif | |
1333 | igmp_group_added(im); | |
1334 | if (!in_dev->dead) | |
1335 | ip_rt_multicast_event(in_dev); | |
1336 | out: | |
1337 | return; | |
1338 | } | |
4bc2f18b | 1339 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1340 | |
a816c7c7 | 1341 | /* |
4aa5dee4 | 1342 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1343 | */ |
4aa5dee4 | 1344 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1345 | { |
08882669 | 1346 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1347 | struct ip_mc_list *im; |
1348 | int type; | |
a816c7c7 | 1349 | |
4aa5dee4 JP |
1350 | ASSERT_RTNL(); |
1351 | ||
1352 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1353 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1354 | continue; | |
a816c7c7 | 1355 | |
866f3b25 ED |
1356 | /* a failover is happening and switches |
1357 | * must be notified immediately | |
1358 | */ | |
1359 | if (IGMP_V1_SEEN(in_dev)) | |
1360 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1361 | else if (IGMP_V2_SEEN(in_dev)) | |
1362 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1363 | else | |
1364 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1365 | igmp_send_report(in_dev, im, type); | |
1366 | } | |
a816c7c7 JV |
1367 | #endif |
1368 | } | |
1369 | ||
1da177e4 LT |
1370 | /* |
1371 | * A socket has left a multicast group on device dev | |
1372 | */ | |
1373 | ||
8f935bbd | 1374 | void ip_mc_dec_group(struct in_device *in_dev, __be32 addr) |
1da177e4 | 1375 | { |
1d7138de ED |
1376 | struct ip_mc_list *i; |
1377 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1378 | |
1da177e4 | 1379 | ASSERT_RTNL(); |
e905a9ed | 1380 | |
1d7138de ED |
1381 | for (ip = &in_dev->mc_list; |
1382 | (i = rtnl_dereference(*ip)) != NULL; | |
1383 | ip = &i->next_rcu) { | |
a7e9ff73 | 1384 | if (i->multiaddr == addr) { |
1da177e4 | 1385 | if (--i->users == 0) { |
e9897071 | 1386 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1387 | *ip = i->next_rcu; |
b8bae41e | 1388 | in_dev->mc_count--; |
1da177e4 | 1389 | igmp_group_dropped(i); |
24cf3af3 | 1390 | ip_mc_clear_src(i); |
1da177e4 LT |
1391 | |
1392 | if (!in_dev->dead) | |
1393 | ip_rt_multicast_event(in_dev); | |
1394 | ||
1395 | ip_ma_put(i); | |
1396 | return; | |
1397 | } | |
1398 | break; | |
1399 | } | |
1400 | } | |
1401 | } | |
4bc2f18b | 1402 | EXPORT_SYMBOL(ip_mc_dec_group); |
1da177e4 | 1403 | |
75c78500 MS |
1404 | /* Device changing type */ |
1405 | ||
1406 | void ip_mc_unmap(struct in_device *in_dev) | |
1407 | { | |
1d7138de | 1408 | struct ip_mc_list *pmc; |
75c78500 MS |
1409 | |
1410 | ASSERT_RTNL(); | |
1411 | ||
1d7138de ED |
1412 | for_each_pmc_rtnl(in_dev, pmc) |
1413 | igmp_group_dropped(pmc); | |
75c78500 MS |
1414 | } |
1415 | ||
1416 | void ip_mc_remap(struct in_device *in_dev) | |
1417 | { | |
1d7138de | 1418 | struct ip_mc_list *pmc; |
75c78500 MS |
1419 | |
1420 | ASSERT_RTNL(); | |
1421 | ||
1d7138de ED |
1422 | for_each_pmc_rtnl(in_dev, pmc) |
1423 | igmp_group_added(pmc); | |
75c78500 MS |
1424 | } |
1425 | ||
1da177e4 LT |
1426 | /* Device going down */ |
1427 | ||
1428 | void ip_mc_down(struct in_device *in_dev) | |
1429 | { | |
1d7138de | 1430 | struct ip_mc_list *pmc; |
1da177e4 LT |
1431 | |
1432 | ASSERT_RTNL(); | |
1433 | ||
1d7138de ED |
1434 | for_each_pmc_rtnl(in_dev, pmc) |
1435 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1436 | |
1437 | #ifdef CONFIG_IP_MULTICAST | |
1438 | in_dev->mr_ifc_count = 0; | |
1439 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1440 | __in_dev_put(in_dev); | |
1441 | in_dev->mr_gq_running = 0; | |
1442 | if (del_timer(&in_dev->mr_gq_timer)) | |
1443 | __in_dev_put(in_dev); | |
1444 | igmpv3_clear_delrec(in_dev); | |
1445 | #endif | |
1446 | ||
1447 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1448 | } | |
1449 | ||
1450 | void ip_mc_init_dev(struct in_device *in_dev) | |
1451 | { | |
1452 | ASSERT_RTNL(); | |
1453 | ||
1da177e4 | 1454 | #ifdef CONFIG_IP_MULTICAST |
b24b8a24 PE |
1455 | setup_timer(&in_dev->mr_gq_timer, igmp_gq_timer_expire, |
1456 | (unsigned long)in_dev); | |
b24b8a24 PE |
1457 | setup_timer(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, |
1458 | (unsigned long)in_dev); | |
a9fe8e29 | 1459 | in_dev->mr_qrv = sysctl_igmp_qrv; |
1da177e4 LT |
1460 | #endif |
1461 | ||
1da177e4 LT |
1462 | spin_lock_init(&in_dev->mc_tomb_lock); |
1463 | } | |
1464 | ||
1465 | /* Device going up */ | |
1466 | ||
1467 | void ip_mc_up(struct in_device *in_dev) | |
1468 | { | |
1d7138de | 1469 | struct ip_mc_list *pmc; |
1da177e4 LT |
1470 | |
1471 | ASSERT_RTNL(); | |
1472 | ||
a9fe8e29 HFS |
1473 | #ifdef CONFIG_IP_MULTICAST |
1474 | in_dev->mr_qrv = sysctl_igmp_qrv; | |
1475 | #endif | |
1da177e4 LT |
1476 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1477 | ||
1d7138de ED |
1478 | for_each_pmc_rtnl(in_dev, pmc) |
1479 | igmp_group_added(pmc); | |
1da177e4 LT |
1480 | } |
1481 | ||
1482 | /* | |
1483 | * Device is about to be destroyed: clean up. | |
1484 | */ | |
1485 | ||
1486 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1487 | { | |
1488 | struct ip_mc_list *i; | |
1489 | ||
1490 | ASSERT_RTNL(); | |
1491 | ||
1492 | /* Deactivate timers */ | |
1493 | ip_mc_down(in_dev); | |
1494 | ||
1d7138de ED |
1495 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1496 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1497 | in_dev->mc_count--; |
1d7138de | 1498 | |
24cf3af3 VF |
1499 | /* We've dropped the groups in ip_mc_down already */ |
1500 | ip_mc_clear_src(i); | |
1da177e4 | 1501 | ip_ma_put(i); |
1da177e4 | 1502 | } |
1da177e4 LT |
1503 | } |
1504 | ||
9e917dca | 1505 | /* RTNL is locked */ |
877acedc | 1506 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1507 | { |
1da177e4 LT |
1508 | struct net_device *dev = NULL; |
1509 | struct in_device *idev = NULL; | |
1510 | ||
1511 | if (imr->imr_ifindex) { | |
877acedc | 1512 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1513 | return idev; |
1514 | } | |
1515 | if (imr->imr_address.s_addr) { | |
9e917dca | 1516 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1517 | if (!dev) |
1518 | return NULL; | |
1da177e4 LT |
1519 | } |
1520 | ||
b23dd4fe | 1521 | if (!dev) { |
78fbfd8a DM |
1522 | struct rtable *rt = ip_route_output(net, |
1523 | imr->imr_multiaddr.s_addr, | |
1524 | 0, 0, 0); | |
b23dd4fe DM |
1525 | if (!IS_ERR(rt)) { |
1526 | dev = rt->dst.dev; | |
1527 | ip_rt_put(rt); | |
1528 | } | |
1da177e4 LT |
1529 | } |
1530 | if (dev) { | |
1531 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1532 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1533 | } |
1534 | return idev; | |
1535 | } | |
1536 | ||
1537 | /* | |
1538 | * Join a socket to a group | |
1539 | */ | |
ab32ea5d BH |
1540 | int sysctl_igmp_max_memberships __read_mostly = IP_MAX_MEMBERSHIPS; |
1541 | int sysctl_igmp_max_msf __read_mostly = IP_MAX_MSF; | |
a9fe8e29 HFS |
1542 | #ifdef CONFIG_IP_MULTICAST |
1543 | int sysctl_igmp_qrv __read_mostly = IGMP_Query_Robustness_Variable; | |
1544 | #endif | |
1da177e4 LT |
1545 | |
1546 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1547 | __be32 *psfsrc) |
1da177e4 LT |
1548 | { |
1549 | struct ip_sf_list *psf, *psf_prev; | |
1550 | int rv = 0; | |
1551 | ||
1552 | psf_prev = NULL; | |
c71151f0 | 1553 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1554 | if (psf->sf_inaddr == *psfsrc) |
1555 | break; | |
1556 | psf_prev = psf; | |
1557 | } | |
1558 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1559 | /* source filter not found, or count wrong => bug */ | |
1560 | return -ESRCH; | |
1561 | } | |
1562 | psf->sf_count[sfmode]--; | |
1563 | if (psf->sf_count[sfmode] == 0) { | |
1564 | ip_rt_multicast_event(pmc->interface); | |
1565 | } | |
1566 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1567 | #ifdef CONFIG_IP_MULTICAST | |
1568 | struct in_device *in_dev = pmc->interface; | |
1569 | #endif | |
1570 | ||
1571 | /* no more filters for this source */ | |
1572 | if (psf_prev) | |
1573 | psf_prev->sf_next = psf->sf_next; | |
1574 | else | |
1575 | pmc->sources = psf->sf_next; | |
1576 | #ifdef CONFIG_IP_MULTICAST | |
1577 | if (psf->sf_oldin && | |
1578 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
a9fe8e29 | 1579 | psf->sf_crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 LT |
1580 | psf->sf_next = pmc->tomb; |
1581 | pmc->tomb = psf; | |
1582 | rv = 1; | |
1583 | } else | |
1584 | #endif | |
1585 | kfree(psf); | |
1586 | } | |
1587 | return rv; | |
1588 | } | |
1589 | ||
1590 | #ifndef CONFIG_IP_MULTICAST | |
1591 | #define igmp_ifc_event(x) do { } while (0) | |
1592 | #endif | |
1593 | ||
8f935bbd AV |
1594 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1595 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1596 | { |
1597 | struct ip_mc_list *pmc; | |
1598 | int changerec = 0; | |
1599 | int i, err; | |
1600 | ||
1601 | if (!in_dev) | |
1602 | return -ENODEV; | |
1d7138de ED |
1603 | rcu_read_lock(); |
1604 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1605 | if (*pmca == pmc->multiaddr) |
1606 | break; | |
1607 | } | |
1608 | if (!pmc) { | |
1609 | /* MCA not found?? bug */ | |
1d7138de | 1610 | rcu_read_unlock(); |
1da177e4 LT |
1611 | return -ESRCH; |
1612 | } | |
1613 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1614 | rcu_read_unlock(); |
1da177e4 LT |
1615 | #ifdef CONFIG_IP_MULTICAST |
1616 | sf_markstate(pmc); | |
1617 | #endif | |
1618 | if (!delta) { | |
1619 | err = -EINVAL; | |
1620 | if (!pmc->sfcount[sfmode]) | |
1621 | goto out_unlock; | |
1622 | pmc->sfcount[sfmode]--; | |
1623 | } | |
1624 | err = 0; | |
c71151f0 | 1625 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
1626 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
1627 | ||
1628 | changerec |= rv > 0; | |
1629 | if (!err && rv < 0) | |
1630 | err = rv; | |
1631 | } | |
1632 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1633 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1634 | pmc->sfcount[MCAST_INCLUDE]) { | |
1635 | #ifdef CONFIG_IP_MULTICAST | |
1636 | struct ip_sf_list *psf; | |
1637 | #endif | |
1638 | ||
1639 | /* filter mode change */ | |
1640 | pmc->sfmode = MCAST_INCLUDE; | |
1641 | #ifdef CONFIG_IP_MULTICAST | |
a9fe8e29 | 1642 | pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 | 1643 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 1644 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1645 | psf->sf_crcount = 0; |
1646 | igmp_ifc_event(pmc->interface); | |
1647 | } else if (sf_setstate(pmc) || changerec) { | |
1648 | igmp_ifc_event(pmc->interface); | |
1649 | #endif | |
1650 | } | |
1651 | out_unlock: | |
1652 | spin_unlock_bh(&pmc->lock); | |
1653 | return err; | |
1654 | } | |
1655 | ||
1656 | /* | |
1657 | * Add multicast single-source filter to the interface list | |
1658 | */ | |
1659 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1660 | __be32 *psfsrc) |
1da177e4 LT |
1661 | { |
1662 | struct ip_sf_list *psf, *psf_prev; | |
1663 | ||
1664 | psf_prev = NULL; | |
c71151f0 | 1665 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1666 | if (psf->sf_inaddr == *psfsrc) |
1667 | break; | |
1668 | psf_prev = psf; | |
1669 | } | |
1670 | if (!psf) { | |
0da974f4 | 1671 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1672 | if (!psf) |
1673 | return -ENOBUFS; | |
1da177e4 LT |
1674 | psf->sf_inaddr = *psfsrc; |
1675 | if (psf_prev) { | |
1676 | psf_prev->sf_next = psf; | |
1677 | } else | |
1678 | pmc->sources = psf; | |
1679 | } | |
1680 | psf->sf_count[sfmode]++; | |
1681 | if (psf->sf_count[sfmode] == 1) { | |
1682 | ip_rt_multicast_event(pmc->interface); | |
1683 | } | |
1684 | return 0; | |
1685 | } | |
1686 | ||
1687 | #ifdef CONFIG_IP_MULTICAST | |
1688 | static void sf_markstate(struct ip_mc_list *pmc) | |
1689 | { | |
1690 | struct ip_sf_list *psf; | |
1691 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1692 | ||
c71151f0 | 1693 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1694 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1695 | psf->sf_oldin = mca_xcount == | |
1696 | psf->sf_count[MCAST_EXCLUDE] && | |
1697 | !psf->sf_count[MCAST_INCLUDE]; | |
1698 | } else | |
1699 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
1700 | } | |
1701 | ||
1702 | static int sf_setstate(struct ip_mc_list *pmc) | |
1703 | { | |
ad12583f | 1704 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
1705 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
1706 | int qrv = pmc->interface->mr_qrv; | |
1707 | int new_in, rv; | |
1708 | ||
1709 | rv = 0; | |
c71151f0 | 1710 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1711 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1712 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
1713 | !psf->sf_count[MCAST_INCLUDE]; | |
1714 | } else | |
1715 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
1716 | if (new_in) { |
1717 | if (!psf->sf_oldin) { | |
76edc605 | 1718 | struct ip_sf_list *prev = NULL; |
ad12583f | 1719 | |
c71151f0 | 1720 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
1721 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1722 | break; | |
1723 | prev = dpsf; | |
1724 | } | |
1725 | if (dpsf) { | |
1726 | if (prev) | |
1727 | prev->sf_next = dpsf->sf_next; | |
1728 | else | |
1729 | pmc->tomb = dpsf->sf_next; | |
1730 | kfree(dpsf); | |
1731 | } | |
1732 | psf->sf_crcount = qrv; | |
1733 | rv++; | |
1734 | } | |
1735 | } else if (psf->sf_oldin) { | |
1736 | ||
1737 | psf->sf_crcount = 0; | |
1738 | /* | |
1739 | * add or update "delete" records if an active filter | |
1740 | * is now inactive | |
1741 | */ | |
c71151f0 | 1742 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
1743 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
1744 | break; | |
1745 | if (!dpsf) { | |
3ed37a6f | 1746 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
1747 | if (!dpsf) |
1748 | continue; | |
1749 | *dpsf = *psf; | |
1750 | /* pmc->lock held by callers */ | |
1751 | dpsf->sf_next = pmc->tomb; | |
1752 | pmc->tomb = dpsf; | |
1753 | } | |
1754 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
1755 | rv++; |
1756 | } | |
1757 | } | |
1758 | return rv; | |
1759 | } | |
1760 | #endif | |
1761 | ||
1762 | /* | |
1763 | * Add multicast source filter list to the interface list | |
1764 | */ | |
8f935bbd AV |
1765 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1766 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1767 | { |
1768 | struct ip_mc_list *pmc; | |
1769 | int isexclude; | |
1770 | int i, err; | |
1771 | ||
1772 | if (!in_dev) | |
1773 | return -ENODEV; | |
1d7138de ED |
1774 | rcu_read_lock(); |
1775 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1776 | if (*pmca == pmc->multiaddr) |
1777 | break; | |
1778 | } | |
1779 | if (!pmc) { | |
1780 | /* MCA not found?? bug */ | |
1d7138de | 1781 | rcu_read_unlock(); |
1da177e4 LT |
1782 | return -ESRCH; |
1783 | } | |
1784 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1785 | rcu_read_unlock(); |
1da177e4 LT |
1786 | |
1787 | #ifdef CONFIG_IP_MULTICAST | |
1788 | sf_markstate(pmc); | |
1789 | #endif | |
1790 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
1791 | if (!delta) | |
1792 | pmc->sfcount[sfmode]++; | |
1793 | err = 0; | |
c71151f0 | 1794 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 1795 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
1796 | if (err) |
1797 | break; | |
1798 | } | |
1799 | if (err) { | |
1800 | int j; | |
1801 | ||
685f94e6 JZ |
1802 | if (!delta) |
1803 | pmc->sfcount[sfmode]--; | |
c71151f0 | 1804 | for (j = 0; j < i; j++) |
a1889c0d | 1805 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
1806 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
1807 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 1808 | struct ip_sf_list *psf; |
cfcabdcc | 1809 | in_dev = pmc->interface; |
1da177e4 LT |
1810 | #endif |
1811 | ||
1812 | /* filter mode change */ | |
1813 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
1814 | pmc->sfmode = MCAST_EXCLUDE; | |
1815 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
1816 | pmc->sfmode = MCAST_INCLUDE; | |
1817 | #ifdef CONFIG_IP_MULTICAST | |
1818 | /* else no filters; keep old mode for reports */ | |
1819 | ||
a9fe8e29 | 1820 | pmc->crcount = in_dev->mr_qrv ?: sysctl_igmp_qrv; |
1da177e4 | 1821 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 1822 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1823 | psf->sf_crcount = 0; |
1824 | igmp_ifc_event(in_dev); | |
1825 | } else if (sf_setstate(pmc)) { | |
1826 | igmp_ifc_event(in_dev); | |
1827 | #endif | |
1828 | } | |
1829 | spin_unlock_bh(&pmc->lock); | |
1830 | return err; | |
1831 | } | |
1832 | ||
1833 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
1834 | { | |
1835 | struct ip_sf_list *psf, *nextpsf; | |
1836 | ||
c71151f0 | 1837 | for (psf = pmc->tomb; psf; psf = nextpsf) { |
1da177e4 LT |
1838 | nextpsf = psf->sf_next; |
1839 | kfree(psf); | |
1840 | } | |
1841 | pmc->tomb = NULL; | |
c71151f0 | 1842 | for (psf = pmc->sources; psf; psf = nextpsf) { |
1da177e4 LT |
1843 | nextpsf = psf->sf_next; |
1844 | kfree(psf); | |
1845 | } | |
1846 | pmc->sources = NULL; | |
1847 | pmc->sfmode = MCAST_EXCLUDE; | |
de9daad9 | 1848 | pmc->sfcount[MCAST_INCLUDE] = 0; |
1da177e4 LT |
1849 | pmc->sfcount[MCAST_EXCLUDE] = 1; |
1850 | } | |
1851 | ||
1852 | ||
1853 | /* | |
1854 | * Join a multicast group | |
1855 | */ | |
1856 | int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) | |
1857 | { | |
1858 | int err; | |
8f935bbd | 1859 | __be32 addr = imr->imr_multiaddr.s_addr; |
a7e9ff73 | 1860 | struct ip_mc_socklist *iml = NULL, *i; |
1da177e4 LT |
1861 | struct in_device *in_dev; |
1862 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 1863 | struct net *net = sock_net(sk); |
ca9b907d | 1864 | int ifindex; |
1da177e4 LT |
1865 | int count = 0; |
1866 | ||
f97c1e0c | 1867 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1868 | return -EINVAL; |
1869 | ||
6756ae4b | 1870 | rtnl_lock(); |
1da177e4 | 1871 | |
877acedc | 1872 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
1873 | |
1874 | if (!in_dev) { | |
1875 | iml = NULL; | |
1876 | err = -ENODEV; | |
1877 | goto done; | |
1878 | } | |
1879 | ||
1da177e4 | 1880 | err = -EADDRINUSE; |
ca9b907d | 1881 | ifindex = imr->imr_ifindex; |
1d7138de | 1882 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
1883 | if (i->multi.imr_multiaddr.s_addr == addr && |
1884 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 1885 | goto done; |
1da177e4 LT |
1886 | count++; |
1887 | } | |
1888 | err = -ENOBUFS; | |
ca9b907d DS |
1889 | if (count >= sysctl_igmp_max_memberships) |
1890 | goto done; | |
a7e9ff73 | 1891 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
ca9b907d | 1892 | if (iml == NULL) |
1da177e4 | 1893 | goto done; |
ca9b907d | 1894 | |
1da177e4 | 1895 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 1896 | iml->next_rcu = inet->mc_list; |
1da177e4 LT |
1897 | iml->sflist = NULL; |
1898 | iml->sfmode = MCAST_EXCLUDE; | |
cf778b00 | 1899 | rcu_assign_pointer(inet->mc_list, iml); |
1da177e4 | 1900 | ip_mc_inc_group(in_dev, addr); |
1da177e4 | 1901 | err = 0; |
1da177e4 | 1902 | done: |
6756ae4b | 1903 | rtnl_unlock(); |
1da177e4 LT |
1904 | return err; |
1905 | } | |
4bc2f18b | 1906 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 LT |
1907 | |
1908 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, | |
1909 | struct in_device *in_dev) | |
1910 | { | |
1d7138de | 1911 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
1912 | int err; |
1913 | ||
c85bb41e | 1914 | if (psf == NULL) { |
1da177e4 LT |
1915 | /* any-source empty exclude case */ |
1916 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
1917 | iml->sfmode, 0, NULL, 0); | |
1918 | } | |
1919 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 1920 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 1921 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
1922 | /* decrease mem now to avoid the memleak warning */ |
1923 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 1924 | kfree_rcu(psf, rcu); |
1da177e4 LT |
1925 | return err; |
1926 | } | |
1927 | ||
1928 | /* | |
1929 | * Ask a socket to leave a group. | |
1930 | */ | |
1931 | ||
1932 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) | |
1933 | { | |
1934 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
1935 | struct ip_mc_socklist *iml; |
1936 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 1937 | struct in_device *in_dev; |
877acedc | 1938 | struct net *net = sock_net(sk); |
8f935bbd | 1939 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 1940 | u32 ifindex; |
acd6e00b | 1941 | int ret = -EADDRNOTAVAIL; |
1da177e4 LT |
1942 | |
1943 | rtnl_lock(); | |
877acedc | 1944 | in_dev = ip_mc_find_dev(net, imr); |
52ad353a | 1945 | if (!in_dev) { |
1946 | ret = -ENODEV; | |
1947 | goto out; | |
1948 | } | |
84b42bae | 1949 | ifindex = imr->imr_ifindex; |
1d7138de ED |
1950 | for (imlp = &inet->mc_list; |
1951 | (iml = rtnl_dereference(*imlp)) != NULL; | |
1952 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
1953 | if (iml->multi.imr_multiaddr.s_addr != group) |
1954 | continue; | |
1955 | if (ifindex) { | |
1956 | if (iml->multi.imr_ifindex != ifindex) | |
1957 | continue; | |
1958 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
1959 | iml->multi.imr_address.s_addr) | |
1960 | continue; | |
1da177e4 | 1961 | |
acd6e00b | 1962 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 1963 | |
1d7138de | 1964 | *imlp = iml->next_rcu; |
acd6e00b | 1965 | |
52ad353a | 1966 | ip_mc_dec_group(in_dev, group); |
acd6e00b | 1967 | rtnl_unlock(); |
c85bb41e FL |
1968 | /* decrease mem now to avoid the memleak warning */ |
1969 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 1970 | kfree_rcu(iml, rcu); |
acd6e00b | 1971 | return 0; |
1da177e4 | 1972 | } |
52ad353a | 1973 | out: |
1da177e4 | 1974 | rtnl_unlock(); |
acd6e00b | 1975 | return ret; |
1da177e4 | 1976 | } |
193ba924 | 1977 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
1978 | |
1979 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
1980 | ip_mreq_source *mreqs, int ifindex) | |
1981 | { | |
1982 | int err; | |
1983 | struct ip_mreqn imr; | |
63007727 | 1984 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
1985 | struct ip_mc_socklist *pmc; |
1986 | struct in_device *in_dev = NULL; | |
1987 | struct inet_sock *inet = inet_sk(sk); | |
1988 | struct ip_sf_socklist *psl; | |
877acedc | 1989 | struct net *net = sock_net(sk); |
8cdaaa15 | 1990 | int leavegroup = 0; |
1da177e4 LT |
1991 | int i, j, rv; |
1992 | ||
f97c1e0c | 1993 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
1994 | return -EINVAL; |
1995 | ||
6756ae4b | 1996 | rtnl_lock(); |
1da177e4 LT |
1997 | |
1998 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
1999 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2000 | imr.imr_ifindex = ifindex; | |
877acedc | 2001 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2002 | |
2003 | if (!in_dev) { | |
2004 | err = -ENODEV; | |
2005 | goto done; | |
2006 | } | |
2007 | err = -EADDRNOTAVAIL; | |
2008 | ||
1d7138de | 2009 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2010 | if ((pmc->multi.imr_multiaddr.s_addr == |
2011 | imr.imr_multiaddr.s_addr) && | |
2012 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2013 | break; |
2014 | } | |
917f2f10 DS |
2015 | if (!pmc) { /* must have a prior join */ |
2016 | err = -EINVAL; | |
1da177e4 | 2017 | goto done; |
917f2f10 | 2018 | } |
1da177e4 LT |
2019 | /* if a source filter was set, must be the same mode as before */ |
2020 | if (pmc->sflist) { | |
917f2f10 DS |
2021 | if (pmc->sfmode != omode) { |
2022 | err = -EINVAL; | |
1da177e4 | 2023 | goto done; |
917f2f10 | 2024 | } |
1da177e4 LT |
2025 | } else if (pmc->sfmode != omode) { |
2026 | /* allow mode switches for empty-set filters */ | |
2027 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2028 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2029 | NULL, 0); |
2030 | pmc->sfmode = omode; | |
2031 | } | |
2032 | ||
1d7138de | 2033 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2034 | if (!add) { |
2035 | if (!psl) | |
917f2f10 | 2036 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2037 | rv = !0; |
c71151f0 | 2038 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2039 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2040 | sizeof(__be32)); |
1da177e4 LT |
2041 | if (rv == 0) |
2042 | break; | |
2043 | } | |
2044 | if (rv) /* source not found */ | |
917f2f10 | 2045 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2046 | |
8cdaaa15 DS |
2047 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2048 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2049 | leavegroup = 1; | |
2050 | goto done; | |
2051 | } | |
2052 | ||
1da177e4 | 2053 | /* update the interface filter */ |
e905a9ed | 2054 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2055 | &mreqs->imr_sourceaddr, 1); |
2056 | ||
c71151f0 | 2057 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2058 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2059 | psl->sl_count--; | |
2060 | err = 0; | |
2061 | goto done; | |
2062 | } | |
2063 | /* else, add a new source to the filter */ | |
2064 | ||
2065 | if (psl && psl->sl_count >= sysctl_igmp_max_msf) { | |
2066 | err = -ENOBUFS; | |
2067 | goto done; | |
2068 | } | |
2069 | if (!psl || psl->sl_count == psl->sl_max) { | |
2070 | struct ip_sf_socklist *newpsl; | |
2071 | int count = IP_SFBLOCK; | |
2072 | ||
2073 | if (psl) | |
2074 | count += psl->sl_max; | |
8b3a7005 | 2075 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2076 | if (!newpsl) { |
2077 | err = -ENOBUFS; | |
2078 | goto done; | |
2079 | } | |
2080 | newpsl->sl_max = count; | |
2081 | newpsl->sl_count = count - IP_SFBLOCK; | |
2082 | if (psl) { | |
c71151f0 | 2083 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2084 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e FL |
2085 | /* decrease mem now to avoid the memleak warning */ |
2086 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2087 | kfree_rcu(psl, rcu); |
1da177e4 | 2088 | } |
cf778b00 | 2089 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2090 | psl = newpsl; |
1da177e4 LT |
2091 | } |
2092 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2093 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2094 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2095 | sizeof(__be32)); |
1da177e4 LT |
2096 | if (rv == 0) |
2097 | break; | |
2098 | } | |
2099 | if (rv == 0) /* address already there is an error */ | |
2100 | goto done; | |
c71151f0 | 2101 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2102 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2103 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2104 | psl->sl_count++; | |
2105 | err = 0; | |
2106 | /* update the interface list */ | |
e905a9ed | 2107 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2108 | &mreqs->imr_sourceaddr, 1); |
2109 | done: | |
6756ae4b | 2110 | rtnl_unlock(); |
8cdaaa15 DS |
2111 | if (leavegroup) |
2112 | return ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2113 | return err; |
2114 | } | |
2115 | ||
2116 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2117 | { | |
9951f036 | 2118 | int err = 0; |
1da177e4 | 2119 | struct ip_mreqn imr; |
63007727 | 2120 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2121 | struct ip_mc_socklist *pmc; |
2122 | struct in_device *in_dev; | |
2123 | struct inet_sock *inet = inet_sk(sk); | |
2124 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2125 | struct net *net = sock_net(sk); |
9951f036 | 2126 | int leavegroup = 0; |
1da177e4 | 2127 | |
f97c1e0c | 2128 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2129 | return -EINVAL; |
2130 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2131 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2132 | return -EINVAL; | |
2133 | ||
6756ae4b | 2134 | rtnl_lock(); |
1da177e4 LT |
2135 | |
2136 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2137 | imr.imr_address.s_addr = msf->imsf_interface; | |
2138 | imr.imr_ifindex = ifindex; | |
877acedc | 2139 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2140 | |
2141 | if (!in_dev) { | |
2142 | err = -ENODEV; | |
2143 | goto done; | |
2144 | } | |
1da177e4 | 2145 | |
9951f036 DS |
2146 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2147 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2148 | leavegroup = 1; | |
2149 | goto done; | |
2150 | } | |
2151 | ||
1d7138de | 2152 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2153 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2154 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2155 | break; | |
2156 | } | |
917f2f10 DS |
2157 | if (!pmc) { /* must have a prior join */ |
2158 | err = -EINVAL; | |
1da177e4 | 2159 | goto done; |
917f2f10 | 2160 | } |
1da177e4 | 2161 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2162 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2163 | GFP_KERNEL); | |
1da177e4 LT |
2164 | if (!newpsl) { |
2165 | err = -ENOBUFS; | |
2166 | goto done; | |
2167 | } | |
2168 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2169 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2170 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2171 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2172 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2173 | if (err) { | |
2174 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2175 | goto done; | |
2176 | } | |
8713dbf0 | 2177 | } else { |
1da177e4 | 2178 | newpsl = NULL; |
8713dbf0 YZ |
2179 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2180 | msf->imsf_fmode, 0, NULL, 0); | |
2181 | } | |
1d7138de | 2182 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2183 | if (psl) { |
2184 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2185 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2186 | /* decrease mem now to avoid the memleak warning */ |
2187 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2188 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2189 | } else |
2190 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2191 | 0, NULL, 0); | |
cf778b00 | 2192 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2193 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2194 | err = 0; |
1da177e4 | 2195 | done: |
6756ae4b | 2196 | rtnl_unlock(); |
9951f036 DS |
2197 | if (leavegroup) |
2198 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2199 | return err; |
2200 | } | |
2201 | ||
2202 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2203 | struct ip_msfilter __user *optval, int __user *optlen) | |
2204 | { | |
2205 | int err, len, count, copycount; | |
2206 | struct ip_mreqn imr; | |
63007727 | 2207 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2208 | struct ip_mc_socklist *pmc; |
2209 | struct in_device *in_dev; | |
2210 | struct inet_sock *inet = inet_sk(sk); | |
2211 | struct ip_sf_socklist *psl; | |
877acedc | 2212 | struct net *net = sock_net(sk); |
1da177e4 | 2213 | |
f97c1e0c | 2214 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2215 | return -EINVAL; |
2216 | ||
6756ae4b | 2217 | rtnl_lock(); |
1da177e4 LT |
2218 | |
2219 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2220 | imr.imr_address.s_addr = msf->imsf_interface; | |
2221 | imr.imr_ifindex = 0; | |
877acedc | 2222 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2223 | |
2224 | if (!in_dev) { | |
2225 | err = -ENODEV; | |
2226 | goto done; | |
2227 | } | |
2228 | err = -EADDRNOTAVAIL; | |
2229 | ||
1d7138de | 2230 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2231 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2232 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2233 | break; | |
2234 | } | |
2235 | if (!pmc) /* must have a prior join */ | |
2236 | goto done; | |
2237 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2238 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2239 | rtnl_unlock(); |
1da177e4 LT |
2240 | if (!psl) { |
2241 | len = 0; | |
2242 | count = 0; | |
2243 | } else { | |
2244 | count = psl->sl_count; | |
2245 | } | |
2246 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2247 | len = copycount * sizeof(psl->sl_addr[0]); | |
2248 | msf->imsf_numsrc = count; | |
2249 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2250 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2251 | return -EFAULT; | |
2252 | } | |
2253 | if (len && | |
2254 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2255 | return -EFAULT; | |
2256 | return 0; | |
2257 | done: | |
6756ae4b | 2258 | rtnl_unlock(); |
1da177e4 LT |
2259 | return err; |
2260 | } | |
2261 | ||
2262 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2263 | struct group_filter __user *optval, int __user *optlen) | |
2264 | { | |
2265 | int err, i, count, copycount; | |
2266 | struct sockaddr_in *psin; | |
63007727 | 2267 | __be32 addr; |
1da177e4 LT |
2268 | struct ip_mc_socklist *pmc; |
2269 | struct inet_sock *inet = inet_sk(sk); | |
2270 | struct ip_sf_socklist *psl; | |
2271 | ||
2272 | psin = (struct sockaddr_in *)&gsf->gf_group; | |
2273 | if (psin->sin_family != AF_INET) | |
2274 | return -EINVAL; | |
2275 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2276 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2277 | return -EINVAL; |
2278 | ||
6756ae4b | 2279 | rtnl_lock(); |
1da177e4 LT |
2280 | |
2281 | err = -EADDRNOTAVAIL; | |
2282 | ||
1d7138de | 2283 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2284 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2285 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2286 | break; | |
2287 | } | |
2288 | if (!pmc) /* must have a prior join */ | |
2289 | goto done; | |
2290 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2291 | psl = rtnl_dereference(pmc->sflist); |
6756ae4b | 2292 | rtnl_unlock(); |
1da177e4 LT |
2293 | count = psl ? psl->sl_count : 0; |
2294 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2295 | gsf->gf_numsrc = count; | |
2296 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2297 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2298 | return -EFAULT; | |
2299 | } | |
c71151f0 | 2300 | for (i = 0; i < copycount; i++) { |
1da177e4 LT |
2301 | struct sockaddr_storage ss; |
2302 | ||
2303 | psin = (struct sockaddr_in *)&ss; | |
2304 | memset(&ss, 0, sizeof(ss)); | |
2305 | psin->sin_family = AF_INET; | |
2306 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2307 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2308 | return -EFAULT; | |
2309 | } | |
2310 | return 0; | |
2311 | done: | |
6756ae4b | 2312 | rtnl_unlock(); |
1da177e4 LT |
2313 | return err; |
2314 | } | |
2315 | ||
2316 | /* | |
2317 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2318 | */ | |
c0cda068 | 2319 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, int dif) |
1da177e4 LT |
2320 | { |
2321 | struct inet_sock *inet = inet_sk(sk); | |
2322 | struct ip_mc_socklist *pmc; | |
2323 | struct ip_sf_socklist *psl; | |
2324 | int i; | |
c85bb41e | 2325 | int ret; |
1da177e4 | 2326 | |
c85bb41e | 2327 | ret = 1; |
f97c1e0c | 2328 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2329 | goto out; |
1da177e4 | 2330 | |
c85bb41e | 2331 | rcu_read_lock(); |
1d7138de | 2332 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 LT |
2333 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
2334 | pmc->multi.imr_ifindex == dif) | |
2335 | break; | |
2336 | } | |
c85bb41e | 2337 | ret = inet->mc_all; |
1da177e4 | 2338 | if (!pmc) |
c85bb41e | 2339 | goto unlock; |
1d7138de | 2340 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2341 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2342 | if (!psl) |
c85bb41e | 2343 | goto unlock; |
1da177e4 | 2344 | |
c71151f0 | 2345 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2346 | if (psl->sl_addr[i] == rmt_addr) |
2347 | break; | |
2348 | } | |
c85bb41e | 2349 | ret = 0; |
1da177e4 | 2350 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2351 | goto unlock; |
1da177e4 | 2352 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2353 | goto unlock; |
2354 | ret = 1; | |
2355 | unlock: | |
2356 | rcu_read_unlock(); | |
2357 | out: | |
2358 | return ret; | |
1da177e4 LT |
2359 | } |
2360 | ||
2361 | /* | |
2362 | * A socket is closing. | |
2363 | */ | |
2364 | ||
2365 | void ip_mc_drop_socket(struct sock *sk) | |
2366 | { | |
2367 | struct inet_sock *inet = inet_sk(sk); | |
2368 | struct ip_mc_socklist *iml; | |
877acedc | 2369 | struct net *net = sock_net(sk); |
1da177e4 LT |
2370 | |
2371 | if (inet->mc_list == NULL) | |
2372 | return; | |
2373 | ||
2374 | rtnl_lock(); | |
1d7138de | 2375 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2376 | struct in_device *in_dev; |
1da177e4 | 2377 | |
1d7138de | 2378 | inet->mc_list = iml->next_rcu; |
877acedc | 2379 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2380 | (void) ip_mc_leave_src(sk, iml, in_dev); |
18943d29 | 2381 | if (in_dev != NULL) |
1da177e4 | 2382 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2383 | /* decrease mem now to avoid the memleak warning */ |
2384 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2385 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2386 | } |
2387 | rtnl_unlock(); | |
2388 | } | |
2389 | ||
dbdd9a52 DM |
2390 | /* called with rcu_read_lock() */ |
2391 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u16 proto) | |
1da177e4 LT |
2392 | { |
2393 | struct ip_mc_list *im; | |
e9897071 | 2394 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2395 | struct ip_sf_list *psf; |
2396 | int rv = 0; | |
2397 | ||
e9897071 ED |
2398 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2399 | if (mc_hash) { | |
c70eba74 | 2400 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2401 | |
2402 | for (im = rcu_dereference(mc_hash[hash]); | |
2403 | im != NULL; | |
2404 | im = rcu_dereference(im->next_hash)) { | |
2405 | if (im->multiaddr == mc_addr) | |
2406 | break; | |
2407 | } | |
2408 | } else { | |
2409 | for_each_pmc_rcu(in_dev, im) { | |
2410 | if (im->multiaddr == mc_addr) | |
2411 | break; | |
2412 | } | |
1da177e4 LT |
2413 | } |
2414 | if (im && proto == IPPROTO_IGMP) { | |
2415 | rv = 1; | |
2416 | } else if (im) { | |
2417 | if (src_addr) { | |
c71151f0 | 2418 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2419 | if (psf->sf_inaddr == src_addr) |
2420 | break; | |
2421 | } | |
2422 | if (psf) | |
2423 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2424 | psf->sf_count[MCAST_EXCLUDE] != | |
2425 | im->sfcount[MCAST_EXCLUDE]; | |
2426 | else | |
2427 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2428 | } else | |
2429 | rv = 1; /* unspecified source; tentatively allow */ | |
2430 | } | |
1da177e4 LT |
2431 | return rv; |
2432 | } | |
2433 | ||
2434 | #if defined(CONFIG_PROC_FS) | |
2435 | struct igmp_mc_iter_state { | |
7091e728 | 2436 | struct seq_net_private p; |
1da177e4 LT |
2437 | struct net_device *dev; |
2438 | struct in_device *in_dev; | |
2439 | }; | |
2440 | ||
2441 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2442 | ||
2443 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2444 | { | |
7091e728 | 2445 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2446 | struct ip_mc_list *im = NULL; |
2447 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2448 | ||
7562f876 | 2449 | state->in_dev = NULL; |
61fbab77 | 2450 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2451 | struct in_device *in_dev; |
6baff150 ED |
2452 | |
2453 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2454 | if (!in_dev) |
2455 | continue; | |
1d7138de | 2456 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2457 | if (im) { |
2458 | state->in_dev = in_dev; | |
2459 | break; | |
2460 | } | |
1da177e4 LT |
2461 | } |
2462 | return im; | |
2463 | } | |
2464 | ||
2465 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2466 | { | |
2467 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2468 | |
1d7138de ED |
2469 | im = rcu_dereference(im->next_rcu); |
2470 | while (!im) { | |
6baff150 | 2471 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2472 | if (!state->dev) { |
2473 | state->in_dev = NULL; | |
2474 | break; | |
2475 | } | |
6baff150 | 2476 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2477 | if (!state->in_dev) |
2478 | continue; | |
1d7138de | 2479 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2480 | } |
2481 | return im; | |
2482 | } | |
2483 | ||
2484 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2485 | { | |
2486 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2487 | if (im) | |
2488 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2489 | --pos; | |
2490 | return pos ? NULL : im; | |
2491 | } | |
2492 | ||
2493 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2494 | __acquires(rcu) |
1da177e4 | 2495 | { |
61fbab77 | 2496 | rcu_read_lock(); |
1da177e4 LT |
2497 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2498 | } | |
2499 | ||
2500 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2501 | { | |
2502 | struct ip_mc_list *im; | |
2503 | if (v == SEQ_START_TOKEN) | |
2504 | im = igmp_mc_get_first(seq); | |
2505 | else | |
2506 | im = igmp_mc_get_next(seq, v); | |
2507 | ++*pos; | |
2508 | return im; | |
2509 | } | |
2510 | ||
2511 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2512 | __releases(rcu) |
1da177e4 LT |
2513 | { |
2514 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2515 | |
2516 | state->in_dev = NULL; | |
1da177e4 | 2517 | state->dev = NULL; |
61fbab77 | 2518 | rcu_read_unlock(); |
1da177e4 LT |
2519 | } |
2520 | ||
2521 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2522 | { | |
2523 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2524 | seq_puts(seq, |
1da177e4 LT |
2525 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2526 | else { | |
2527 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2528 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2529 | char *querier; | |
a399a805 ED |
2530 | long delta; |
2531 | ||
1da177e4 LT |
2532 | #ifdef CONFIG_IP_MULTICAST |
2533 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2534 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2535 | "V3"; | |
2536 | #else | |
2537 | querier = "NONE"; | |
2538 | #endif | |
2539 | ||
e6b68883 | 2540 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2541 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2542 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2543 | } |
2544 | ||
a399a805 | 2545 | delta = im->timer.expires - jiffies; |
1da177e4 | 2546 | seq_printf(seq, |
338fcf98 | 2547 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2548 | im->multiaddr, im->users, |
a399a805 ED |
2549 | im->tm_running, |
2550 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2551 | im->reporter); |
2552 | } | |
2553 | return 0; | |
2554 | } | |
2555 | ||
f690808e | 2556 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2557 | .start = igmp_mc_seq_start, |
2558 | .next = igmp_mc_seq_next, | |
2559 | .stop = igmp_mc_seq_stop, | |
2560 | .show = igmp_mc_seq_show, | |
2561 | }; | |
2562 | ||
2563 | static int igmp_mc_seq_open(struct inode *inode, struct file *file) | |
2564 | { | |
7091e728 | 2565 | return seq_open_net(inode, file, &igmp_mc_seq_ops, |
cf7732e4 | 2566 | sizeof(struct igmp_mc_iter_state)); |
1da177e4 LT |
2567 | } |
2568 | ||
9a32144e | 2569 | static const struct file_operations igmp_mc_seq_fops = { |
1da177e4 LT |
2570 | .owner = THIS_MODULE, |
2571 | .open = igmp_mc_seq_open, | |
2572 | .read = seq_read, | |
2573 | .llseek = seq_lseek, | |
7091e728 | 2574 | .release = seq_release_net, |
1da177e4 LT |
2575 | }; |
2576 | ||
2577 | struct igmp_mcf_iter_state { | |
7091e728 | 2578 | struct seq_net_private p; |
1da177e4 LT |
2579 | struct net_device *dev; |
2580 | struct in_device *idev; | |
2581 | struct ip_mc_list *im; | |
2582 | }; | |
2583 | ||
2584 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2585 | ||
2586 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2587 | { | |
7091e728 | 2588 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2589 | struct ip_sf_list *psf = NULL; |
2590 | struct ip_mc_list *im = NULL; | |
2591 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2592 | ||
7562f876 PE |
2593 | state->idev = NULL; |
2594 | state->im = NULL; | |
61fbab77 | 2595 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2596 | struct in_device *idev; |
6baff150 | 2597 | idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2598 | if (unlikely(idev == NULL)) |
2599 | continue; | |
1d7138de | 2600 | im = rcu_dereference(idev->mc_list); |
1da177e4 LT |
2601 | if (likely(im != NULL)) { |
2602 | spin_lock_bh(&im->lock); | |
2603 | psf = im->sources; | |
2604 | if (likely(psf != NULL)) { | |
2605 | state->im = im; | |
2606 | state->idev = idev; | |
2607 | break; | |
2608 | } | |
2609 | spin_unlock_bh(&im->lock); | |
2610 | } | |
1da177e4 LT |
2611 | } |
2612 | return psf; | |
2613 | } | |
2614 | ||
2615 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2616 | { | |
2617 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2618 | ||
2619 | psf = psf->sf_next; | |
2620 | while (!psf) { | |
2621 | spin_unlock_bh(&state->im->lock); | |
2622 | state->im = state->im->next; | |
2623 | while (!state->im) { | |
6baff150 | 2624 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2625 | if (!state->dev) { |
2626 | state->idev = NULL; | |
2627 | goto out; | |
2628 | } | |
6baff150 | 2629 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2630 | if (!state->idev) |
2631 | continue; | |
1d7138de | 2632 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2633 | } |
2634 | if (!state->im) | |
2635 | break; | |
2636 | spin_lock_bh(&state->im->lock); | |
2637 | psf = state->im->sources; | |
2638 | } | |
2639 | out: | |
2640 | return psf; | |
2641 | } | |
2642 | ||
2643 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2644 | { | |
2645 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2646 | if (psf) | |
2647 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2648 | --pos; | |
2649 | return pos ? NULL : psf; | |
2650 | } | |
2651 | ||
2652 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2653 | __acquires(rcu) |
1da177e4 | 2654 | { |
61fbab77 | 2655 | rcu_read_lock(); |
1da177e4 LT |
2656 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2657 | } | |
2658 | ||
2659 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2660 | { | |
2661 | struct ip_sf_list *psf; | |
2662 | if (v == SEQ_START_TOKEN) | |
2663 | psf = igmp_mcf_get_first(seq); | |
2664 | else | |
2665 | psf = igmp_mcf_get_next(seq, v); | |
2666 | ++*pos; | |
2667 | return psf; | |
2668 | } | |
2669 | ||
2670 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2671 | __releases(rcu) |
1da177e4 LT |
2672 | { |
2673 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2674 | if (likely(state->im != NULL)) { | |
2675 | spin_unlock_bh(&state->im->lock); | |
2676 | state->im = NULL; | |
2677 | } | |
1d7138de | 2678 | state->idev = NULL; |
1da177e4 | 2679 | state->dev = NULL; |
61fbab77 | 2680 | rcu_read_unlock(); |
1da177e4 LT |
2681 | } |
2682 | ||
2683 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2684 | { | |
2685 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2686 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2687 | ||
2688 | if (v == SEQ_START_TOKEN) { | |
e905a9ed | 2689 | seq_printf(seq, |
1da177e4 LT |
2690 | "%3s %6s " |
2691 | "%10s %10s %6s %6s\n", "Idx", | |
2692 | "Device", "MCA", | |
2693 | "SRC", "INC", "EXC"); | |
2694 | } else { | |
2695 | seq_printf(seq, | |
2696 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2697 | "0x%08x %6lu %6lu\n", |
2698 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2699 | ntohl(state->im->multiaddr), |
2700 | ntohl(psf->sf_inaddr), | |
2701 | psf->sf_count[MCAST_INCLUDE], | |
2702 | psf->sf_count[MCAST_EXCLUDE]); | |
2703 | } | |
2704 | return 0; | |
2705 | } | |
2706 | ||
f690808e | 2707 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2708 | .start = igmp_mcf_seq_start, |
2709 | .next = igmp_mcf_seq_next, | |
2710 | .stop = igmp_mcf_seq_stop, | |
2711 | .show = igmp_mcf_seq_show, | |
2712 | }; | |
2713 | ||
2714 | static int igmp_mcf_seq_open(struct inode *inode, struct file *file) | |
2715 | { | |
7091e728 | 2716 | return seq_open_net(inode, file, &igmp_mcf_seq_ops, |
cf7732e4 | 2717 | sizeof(struct igmp_mcf_iter_state)); |
1da177e4 LT |
2718 | } |
2719 | ||
9a32144e | 2720 | static const struct file_operations igmp_mcf_seq_fops = { |
1da177e4 LT |
2721 | .owner = THIS_MODULE, |
2722 | .open = igmp_mcf_seq_open, | |
2723 | .read = seq_read, | |
2724 | .llseek = seq_lseek, | |
7091e728 | 2725 | .release = seq_release_net, |
1da177e4 LT |
2726 | }; |
2727 | ||
2c8c1e72 | 2728 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 2729 | { |
7091e728 AD |
2730 | struct proc_dir_entry *pde; |
2731 | ||
d4beaa66 | 2732 | pde = proc_create("igmp", S_IRUGO, net->proc_net, &igmp_mc_seq_fops); |
7091e728 AD |
2733 | if (!pde) |
2734 | goto out_igmp; | |
d4beaa66 G |
2735 | pde = proc_create("mcfilter", S_IRUGO, net->proc_net, |
2736 | &igmp_mcf_seq_fops); | |
7091e728 AD |
2737 | if (!pde) |
2738 | goto out_mcfilter; | |
1da177e4 | 2739 | return 0; |
7091e728 AD |
2740 | |
2741 | out_mcfilter: | |
ece31ffd | 2742 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
2743 | out_igmp: |
2744 | return -ENOMEM; | |
2745 | } | |
2746 | ||
2c8c1e72 | 2747 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 2748 | { |
ece31ffd G |
2749 | remove_proc_entry("mcfilter", net->proc_net); |
2750 | remove_proc_entry("igmp", net->proc_net); | |
7091e728 AD |
2751 | } |
2752 | ||
2753 | static struct pernet_operations igmp_net_ops = { | |
2754 | .init = igmp_net_init, | |
2755 | .exit = igmp_net_exit, | |
2756 | }; | |
72c1d3bd | 2757 | #endif |
7091e728 | 2758 | |
4aa5dee4 JP |
2759 | static int igmp_netdev_event(struct notifier_block *this, |
2760 | unsigned long event, void *ptr) | |
2761 | { | |
2762 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
2763 | struct in_device *in_dev; | |
2764 | ||
2765 | switch (event) { | |
2766 | case NETDEV_RESEND_IGMP: | |
2767 | in_dev = __in_dev_get_rtnl(dev); | |
2768 | if (in_dev) | |
2769 | ip_mc_rejoin_groups(in_dev); | |
2770 | break; | |
2771 | default: | |
2772 | break; | |
2773 | } | |
2774 | return NOTIFY_DONE; | |
2775 | } | |
2776 | ||
2777 | static struct notifier_block igmp_notifier = { | |
2778 | .notifier_call = igmp_netdev_event, | |
2779 | }; | |
2780 | ||
72c1d3bd | 2781 | int __init igmp_mc_init(void) |
7091e728 | 2782 | { |
72c1d3bd | 2783 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
2784 | int err; |
2785 | ||
2786 | err = register_pernet_subsys(&igmp_net_ops); | |
2787 | if (err) | |
2788 | return err; | |
2789 | err = register_netdevice_notifier(&igmp_notifier); | |
2790 | if (err) | |
2791 | goto reg_notif_fail; | |
2792 | return 0; | |
2793 | ||
2794 | reg_notif_fail: | |
2795 | unregister_pernet_subsys(&igmp_net_ops); | |
2796 | return err; | |
72c1d3bd WC |
2797 | #else |
2798 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 2799 | #endif |
72c1d3bd | 2800 | } |