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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Linux NET3: Internet Group Management Protocol [IGMP] | |
4 | * | |
5 | * This code implements the IGMP protocol as defined in RFC1112. There has | |
6 | * been a further revision of this protocol since which is now supported. | |
7 | * | |
8 | * If you have trouble with this module be careful what gcc you have used, | |
9 | * the older version didn't come out right using gcc 2.5.8, the newer one | |
10 | * seems to fall out with gcc 2.6.2. | |
11 | * | |
1da177e4 | 12 | * Authors: |
113aa838 | 13 | * Alan Cox <alan@lxorguk.ukuu.org.uk> |
1da177e4 | 14 | * |
1da177e4 LT |
15 | * Fixes: |
16 | * | |
17 | * Alan Cox : Added lots of __inline__ to optimise | |
18 | * the memory usage of all the tiny little | |
19 | * functions. | |
20 | * Alan Cox : Dumped the header building experiment. | |
21 | * Alan Cox : Minor tweaks ready for multicast routing | |
22 | * and extended IGMP protocol. | |
23 | * Alan Cox : Removed a load of inline directives. Gcc 2.5.8 | |
24 | * writes utterly bogus code otherwise (sigh) | |
25 | * fixed IGMP loopback to behave in the manner | |
26 | * desired by mrouted, fixed the fact it has been | |
27 | * broken since 1.3.6 and cleaned up a few minor | |
28 | * points. | |
29 | * | |
30 | * Chih-Jen Chang : Tried to revise IGMP to Version 2 | |
31 | * Tsu-Sheng Tsao E-mail: chihjenc@scf.usc.edu and tsusheng@scf.usc.edu | |
e905a9ed | 32 | * The enhancements are mainly based on Steve Deering's |
1da177e4 LT |
33 | * ipmulti-3.5 source code. |
34 | * Chih-Jen Chang : Added the igmp_get_mrouter_info and | |
35 | * Tsu-Sheng Tsao igmp_set_mrouter_info to keep track of | |
36 | * the mrouted version on that device. | |
37 | * Chih-Jen Chang : Added the max_resp_time parameter to | |
38 | * Tsu-Sheng Tsao igmp_heard_query(). Using this parameter | |
39 | * to identify the multicast router version | |
40 | * and do what the IGMP version 2 specified. | |
41 | * Chih-Jen Chang : Added a timer to revert to IGMP V2 router | |
42 | * Tsu-Sheng Tsao if the specified time expired. | |
43 | * Alan Cox : Stop IGMP from 0.0.0.0 being accepted. | |
44 | * Alan Cox : Use GFP_ATOMIC in the right places. | |
45 | * Christian Daudt : igmp timer wasn't set for local group | |
e905a9ed YH |
46 | * memberships but was being deleted, |
47 | * which caused a "del_timer() called | |
1da177e4 LT |
48 | * from %p with timer not initialized\n" |
49 | * message (960131). | |
e905a9ed | 50 | * Christian Daudt : removed del_timer from |
1da177e4 LT |
51 | * igmp_timer_expire function (960205). |
52 | * Christian Daudt : igmp_heard_report now only calls | |
53 | * igmp_timer_expire if tm->running is | |
54 | * true (960216). | |
55 | * Malcolm Beattie : ttl comparison wrong in igmp_rcv made | |
56 | * igmp_heard_query never trigger. Expiry | |
57 | * miscalculation fixed in igmp_heard_query | |
58 | * and random() made to return unsigned to | |
59 | * prevent negative expiry times. | |
60 | * Alexey Kuznetsov: Wrong group leaving behaviour, backport | |
61 | * fix from pending 2.1.x patches. | |
62 | * Alan Cox: Forget to enable FDDI support earlier. | |
63 | * Alexey Kuznetsov: Fixed leaving groups on device down. | |
64 | * Alexey Kuznetsov: Accordance to igmp-v2-06 draft. | |
65 | * David L Stevens: IGMPv3 support, with help from | |
66 | * Vinay Kulkarni | |
67 | */ | |
68 | ||
1da177e4 | 69 | #include <linux/module.h> |
5a0e3ad6 | 70 | #include <linux/slab.h> |
7c0f6ba6 | 71 | #include <linux/uaccess.h> |
1da177e4 LT |
72 | #include <linux/types.h> |
73 | #include <linux/kernel.h> | |
74 | #include <linux/jiffies.h> | |
75 | #include <linux/string.h> | |
76 | #include <linux/socket.h> | |
77 | #include <linux/sockios.h> | |
78 | #include <linux/in.h> | |
79 | #include <linux/inet.h> | |
80 | #include <linux/netdevice.h> | |
81 | #include <linux/skbuff.h> | |
82 | #include <linux/inetdevice.h> | |
83 | #include <linux/igmp.h> | |
84 | #include <linux/if_arp.h> | |
85 | #include <linux/rtnetlink.h> | |
86 | #include <linux/times.h> | |
9d4a0314 | 87 | #include <linux/pkt_sched.h> |
a46182b0 | 88 | #include <linux/byteorder/generic.h> |
14c85021 | 89 | |
457c4cbc | 90 | #include <net/net_namespace.h> |
14c85021 | 91 | #include <net/arp.h> |
1da177e4 LT |
92 | #include <net/ip.h> |
93 | #include <net/protocol.h> | |
94 | #include <net/route.h> | |
95 | #include <net/sock.h> | |
96 | #include <net/checksum.h> | |
93a714d6 | 97 | #include <net/inet_common.h> |
1da177e4 LT |
98 | #include <linux/netfilter_ipv4.h> |
99 | #ifdef CONFIG_IP_MROUTE | |
100 | #include <linux/mroute.h> | |
101 | #endif | |
102 | #ifdef CONFIG_PROC_FS | |
103 | #include <linux/proc_fs.h> | |
104 | #include <linux/seq_file.h> | |
105 | #endif | |
106 | ||
1da177e4 LT |
107 | #ifdef CONFIG_IP_MULTICAST |
108 | /* Parameter names and values are taken from igmp-v2-06 draft */ | |
109 | ||
436f7c20 FF |
110 | #define IGMP_V2_UNSOLICITED_REPORT_INTERVAL (10*HZ) |
111 | #define IGMP_V3_UNSOLICITED_REPORT_INTERVAL (1*HZ) | |
966c37f2 | 112 | #define IGMP_QUERY_INTERVAL (125*HZ) |
436f7c20 | 113 | #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) |
1da177e4 | 114 | |
436f7c20 | 115 | #define IGMP_INITIAL_REPORT_DELAY (1) |
1da177e4 | 116 | |
436f7c20 | 117 | /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! |
1da177e4 LT |
118 | * IGMP specs require to report membership immediately after |
119 | * joining a group, but we delay the first report by a | |
120 | * small interval. It seems more natural and still does not | |
121 | * contradict to specs provided this delay is small enough. | |
122 | */ | |
123 | ||
42f811b8 | 124 | #define IGMP_V1_SEEN(in_dev) \ |
c346dca1 | 125 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
126 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
127 | ((in_dev)->mr_v1_seen && \ | |
128 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
129 | #define IGMP_V2_SEEN(in_dev) \ | |
c346dca1 | 130 | (IPV4_DEVCONF_ALL(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
131 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
132 | ((in_dev)->mr_v2_seen && \ | |
133 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 | 134 | |
cab70040 WM |
135 | static int unsolicited_report_interval(struct in_device *in_dev) |
136 | { | |
2690048c WM |
137 | int interval_ms, interval_jiffies; |
138 | ||
cab70040 | 139 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
2690048c WM |
140 | interval_ms = IN_DEV_CONF_GET( |
141 | in_dev, | |
142 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
cab70040 | 143 | else /* v3 */ |
2690048c WM |
144 | interval_ms = IN_DEV_CONF_GET( |
145 | in_dev, | |
146 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
147 | ||
148 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
149 | ||
150 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
151 | * we always return a positive value. | |
152 | */ | |
153 | if (interval_jiffies <= 0) | |
154 | interval_jiffies = 1; | |
155 | return interval_jiffies; | |
cab70040 WM |
156 | } |
157 | ||
9fb20801 FF |
158 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, |
159 | gfp_t gfp); | |
24803f38 | 160 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
1da177e4 LT |
161 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
162 | static int sf_setstate(struct ip_mc_list *pmc); | |
163 | static void sf_markstate(struct ip_mc_list *pmc); | |
164 | #endif | |
165 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
166 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
167 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
168 | |
169 | static void ip_ma_put(struct ip_mc_list *im) | |
170 | { | |
8851ab52 | 171 | if (refcount_dec_and_test(&im->refcnt)) { |
1da177e4 | 172 | in_dev_put(im->interface); |
42ea299d | 173 | kfree_rcu(im, rcu); |
1da177e4 LT |
174 | } |
175 | } | |
176 | ||
d9aa9380 DM |
177 | #define for_each_pmc_rcu(in_dev, pmc) \ |
178 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
179 | pmc != NULL; \ | |
180 | pmc = rcu_dereference(pmc->next_rcu)) | |
181 | ||
182 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
183 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
184 | pmc != NULL; \ | |
185 | pmc = rtnl_dereference(pmc->next_rcu)) | |
186 | ||
903869bd ED |
187 | static void ip_sf_list_clear_all(struct ip_sf_list *psf) |
188 | { | |
189 | struct ip_sf_list *next; | |
190 | ||
191 | while (psf) { | |
192 | next = psf->sf_next; | |
193 | kfree(psf); | |
194 | psf = next; | |
195 | } | |
196 | } | |
197 | ||
1da177e4 LT |
198 | #ifdef CONFIG_IP_MULTICAST |
199 | ||
200 | /* | |
201 | * Timer management | |
202 | */ | |
203 | ||
1d7138de | 204 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
205 | { |
206 | spin_lock_bh(&im->lock); | |
207 | if (del_timer(&im->timer)) | |
8851ab52 | 208 | refcount_dec(&im->refcnt); |
a7e9ff73 | 209 | im->tm_running = 0; |
1da177e4 LT |
210 | im->reporter = 0; |
211 | im->unsolicit_count = 0; | |
212 | spin_unlock_bh(&im->lock); | |
213 | } | |
214 | ||
215 | /* It must be called with locked im->lock */ | |
216 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
217 | { | |
63862b5b | 218 | int tv = prandom_u32() % max_delay; |
1da177e4 | 219 | |
a7e9ff73 | 220 | im->tm_running = 1; |
1da177e4 | 221 | if (!mod_timer(&im->timer, jiffies+tv+2)) |
8851ab52 | 222 | refcount_inc(&im->refcnt); |
1da177e4 LT |
223 | } |
224 | ||
225 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
226 | { | |
63862b5b | 227 | int tv = prandom_u32() % in_dev->mr_maxdelay; |
7ababb78 MT |
228 | unsigned long exp = jiffies + tv + 2; |
229 | ||
230 | if (in_dev->mr_gq_running && | |
231 | time_after_eq(exp, (in_dev->mr_gq_timer).expires)) | |
232 | return; | |
1da177e4 LT |
233 | |
234 | in_dev->mr_gq_running = 1; | |
7ababb78 | 235 | if (!mod_timer(&in_dev->mr_gq_timer, exp)) |
1da177e4 LT |
236 | in_dev_hold(in_dev); |
237 | } | |
238 | ||
239 | static void igmp_ifc_start_timer(struct in_device *in_dev, int delay) | |
240 | { | |
63862b5b | 241 | int tv = prandom_u32() % delay; |
1da177e4 LT |
242 | |
243 | if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2)) | |
244 | in_dev_hold(in_dev); | |
245 | } | |
246 | ||
247 | static void igmp_mod_timer(struct ip_mc_list *im, int max_delay) | |
248 | { | |
249 | spin_lock_bh(&im->lock); | |
250 | im->unsolicit_count = 0; | |
251 | if (del_timer(&im->timer)) { | |
252 | if ((long)(im->timer.expires-jiffies) < max_delay) { | |
253 | add_timer(&im->timer); | |
a7e9ff73 | 254 | im->tm_running = 1; |
1da177e4 LT |
255 | spin_unlock_bh(&im->lock); |
256 | return; | |
257 | } | |
8851ab52 | 258 | refcount_dec(&im->refcnt); |
1da177e4 LT |
259 | } |
260 | igmp_start_timer(im, max_delay); | |
261 | spin_unlock_bh(&im->lock); | |
262 | } | |
263 | ||
264 | ||
265 | /* | |
266 | * Send an IGMP report. | |
267 | */ | |
268 | ||
269 | #define IGMP_SIZE (sizeof(struct igmphdr)+sizeof(struct iphdr)+4) | |
270 | ||
271 | ||
272 | static int is_in(struct ip_mc_list *pmc, struct ip_sf_list *psf, int type, | |
273 | int gdeleted, int sdeleted) | |
274 | { | |
275 | switch (type) { | |
276 | case IGMPV3_MODE_IS_INCLUDE: | |
277 | case IGMPV3_MODE_IS_EXCLUDE: | |
278 | if (gdeleted || sdeleted) | |
279 | return 0; | |
ad12583f DS |
280 | if (!(pmc->gsquery && !psf->sf_gsresp)) { |
281 | if (pmc->sfmode == MCAST_INCLUDE) | |
282 | return 1; | |
283 | /* don't include if this source is excluded | |
284 | * in all filters | |
285 | */ | |
286 | if (psf->sf_count[MCAST_INCLUDE]) | |
287 | return type == IGMPV3_MODE_IS_INCLUDE; | |
288 | return pmc->sfcount[MCAST_EXCLUDE] == | |
289 | psf->sf_count[MCAST_EXCLUDE]; | |
290 | } | |
291 | return 0; | |
1da177e4 LT |
292 | case IGMPV3_CHANGE_TO_INCLUDE: |
293 | if (gdeleted || sdeleted) | |
294 | return 0; | |
295 | return psf->sf_count[MCAST_INCLUDE] != 0; | |
296 | case IGMPV3_CHANGE_TO_EXCLUDE: | |
297 | if (gdeleted || sdeleted) | |
298 | return 0; | |
299 | if (pmc->sfcount[MCAST_EXCLUDE] == 0 || | |
300 | psf->sf_count[MCAST_INCLUDE]) | |
301 | return 0; | |
302 | return pmc->sfcount[MCAST_EXCLUDE] == | |
303 | psf->sf_count[MCAST_EXCLUDE]; | |
304 | case IGMPV3_ALLOW_NEW_SOURCES: | |
305 | if (gdeleted || !psf->sf_crcount) | |
306 | return 0; | |
307 | return (pmc->sfmode == MCAST_INCLUDE) ^ sdeleted; | |
308 | case IGMPV3_BLOCK_OLD_SOURCES: | |
309 | if (pmc->sfmode == MCAST_INCLUDE) | |
310 | return gdeleted || (psf->sf_crcount && sdeleted); | |
311 | return psf->sf_crcount && !gdeleted && !sdeleted; | |
312 | } | |
313 | return 0; | |
314 | } | |
315 | ||
316 | static int | |
317 | igmp_scount(struct ip_mc_list *pmc, int type, int gdeleted, int sdeleted) | |
318 | { | |
319 | struct ip_sf_list *psf; | |
320 | int scount = 0; | |
321 | ||
c71151f0 | 322 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
323 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
324 | continue; | |
325 | scount++; | |
326 | } | |
327 | return scount; | |
328 | } | |
329 | ||
a46182b0 KC |
330 | /* source address selection per RFC 3376 section 4.2.13 */ |
331 | static __be32 igmpv3_get_srcaddr(struct net_device *dev, | |
332 | const struct flowi4 *fl4) | |
333 | { | |
334 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
cd5a411d | 335 | const struct in_ifaddr *ifa; |
a46182b0 KC |
336 | |
337 | if (!in_dev) | |
338 | return htonl(INADDR_ANY); | |
339 | ||
cd5a411d | 340 | in_dev_for_each_ifa_rcu(ifa, in_dev) { |
ad23b750 | 341 | if (fl4->saddr == ifa->ifa_local) |
a46182b0 | 342 | return fl4->saddr; |
cd5a411d | 343 | } |
a46182b0 KC |
344 | |
345 | return htonl(INADDR_ANY); | |
346 | } | |
347 | ||
4c672e4b | 348 | static struct sk_buff *igmpv3_newpack(struct net_device *dev, unsigned int mtu) |
1da177e4 LT |
349 | { |
350 | struct sk_buff *skb; | |
351 | struct rtable *rt; | |
352 | struct iphdr *pip; | |
353 | struct igmpv3_report *pig; | |
877acedc | 354 | struct net *net = dev_net(dev); |
31e4543d | 355 | struct flowi4 fl4; |
66088243 HX |
356 | int hlen = LL_RESERVED_SPACE(dev); |
357 | int tlen = dev->needed_tailroom; | |
4c672e4b | 358 | unsigned int size = mtu; |
1da177e4 | 359 | |
57e1ab6e | 360 | while (1) { |
66088243 | 361 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
362 | GFP_ATOMIC | __GFP_NOWARN); |
363 | if (skb) | |
364 | break; | |
365 | size >>= 1; | |
366 | if (size < 256) | |
367 | return NULL; | |
368 | } | |
9d4a0314 | 369 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 370 | |
31e4543d | 371 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
372 | 0, 0, |
373 | IPPROTO_IGMP, 0, dev->ifindex); | |
374 | if (IS_ERR(rt)) { | |
375 | kfree_skb(skb); | |
376 | return NULL; | |
1da177e4 | 377 | } |
1da177e4 | 378 | |
d8d1f30b | 379 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
380 | skb->dev = dev; |
381 | ||
66088243 | 382 | skb_reserve(skb, hlen); |
1837b2e2 | 383 | skb_tailroom_reserve(skb, mtu, tlen); |
1da177e4 | 384 | |
7e28ecc2 | 385 | skb_reset_network_header(skb); |
eddc9ec5 | 386 | pip = ip_hdr(skb); |
7e28ecc2 | 387 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
388 | |
389 | pip->version = 4; | |
390 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
391 | pip->tos = 0xc0; | |
392 | pip->frag_off = htons(IP_DF); | |
393 | pip->ttl = 1; | |
492f64ce | 394 | pip->daddr = fl4.daddr; |
e7aadb27 ED |
395 | |
396 | rcu_read_lock(); | |
a46182b0 | 397 | pip->saddr = igmpv3_get_srcaddr(dev, &fl4); |
e7aadb27 ED |
398 | rcu_read_unlock(); |
399 | ||
1da177e4 LT |
400 | pip->protocol = IPPROTO_IGMP; |
401 | pip->tot_len = 0; /* filled in later */ | |
b6a7719a | 402 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
403 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
404 | ((u8 *)&pip[1])[1] = 4; | |
405 | ((u8 *)&pip[1])[2] = 0; | |
406 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 407 | |
b0e380b1 | 408 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 409 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 410 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
411 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
412 | pig->resv1 = 0; | |
413 | pig->csum = 0; | |
414 | pig->resv2 = 0; | |
415 | pig->ngrec = 0; | |
416 | return skb; | |
417 | } | |
418 | ||
419 | static int igmpv3_sendpack(struct sk_buff *skb) | |
420 | { | |
d9edf9e2 | 421 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 422 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 423 | |
d9edf9e2 | 424 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 425 | |
33224b16 | 426 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
1da177e4 LT |
427 | } |
428 | ||
429 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
430 | { | |
a7e9ff73 | 431 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
432 | } |
433 | ||
434 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
b5476022 | 435 | int type, struct igmpv3_grec **ppgr, unsigned int mtu) |
1da177e4 LT |
436 | { |
437 | struct net_device *dev = pmc->interface->dev; | |
438 | struct igmpv3_report *pih; | |
439 | struct igmpv3_grec *pgr; | |
440 | ||
b5476022 ED |
441 | if (!skb) { |
442 | skb = igmpv3_newpack(dev, mtu); | |
443 | if (!skb) | |
444 | return NULL; | |
445 | } | |
4df864c1 | 446 | pgr = skb_put(skb, sizeof(struct igmpv3_grec)); |
1da177e4 LT |
447 | pgr->grec_type = type; |
448 | pgr->grec_auxwords = 0; | |
449 | pgr->grec_nsrcs = 0; | |
450 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 451 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
452 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
453 | *ppgr = pgr; | |
454 | return skb; | |
455 | } | |
456 | ||
4c672e4b | 457 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
458 | |
459 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
460 | int type, int gdeleted, int sdeleted) | |
461 | { | |
462 | struct net_device *dev = pmc->interface->dev; | |
87a8a2ae | 463 | struct net *net = dev_net(dev); |
1da177e4 LT |
464 | struct igmpv3_report *pih; |
465 | struct igmpv3_grec *pgr = NULL; | |
466 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 467 | int scount, stotal, first, isquery, truncate; |
b5476022 | 468 | unsigned int mtu; |
1da177e4 LT |
469 | |
470 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
471 | return skb; | |
87a8a2ae | 472 | if (ipv4_is_local_multicast(pmc->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 473 | return skb; |
1da177e4 | 474 | |
b5476022 ED |
475 | mtu = READ_ONCE(dev->mtu); |
476 | if (mtu < IPV4_MIN_MTU) | |
477 | return skb; | |
478 | ||
1da177e4 LT |
479 | isquery = type == IGMPV3_MODE_IS_INCLUDE || |
480 | type == IGMPV3_MODE_IS_EXCLUDE; | |
481 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
482 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
483 | ||
ad12583f DS |
484 | stotal = scount = 0; |
485 | ||
1da177e4 LT |
486 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
487 | ||
ad12583f DS |
488 | if (!*psf_list) |
489 | goto empty_source; | |
490 | ||
d9edf9e2 | 491 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
492 | |
493 | /* EX and TO_EX get a fresh packet, if needed */ | |
494 | if (truncate) { | |
495 | if (pih && pih->ngrec && | |
496 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
497 | if (skb) | |
498 | igmpv3_sendpack(skb); | |
b5476022 | 499 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
500 | } |
501 | } | |
502 | first = 1; | |
1da177e4 | 503 | psf_prev = NULL; |
c71151f0 | 504 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 505 | __be32 *psrc; |
1da177e4 LT |
506 | |
507 | psf_next = psf->sf_next; | |
508 | ||
509 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
510 | psf_prev = psf; | |
511 | continue; | |
512 | } | |
513 | ||
a052517a HL |
514 | /* Based on RFC3376 5.1. Should not send source-list change |
515 | * records when there is a filter mode change. | |
516 | */ | |
517 | if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || | |
518 | (!gdeleted && pmc->crcount)) && | |
519 | (type == IGMPV3_ALLOW_NEW_SOURCES || | |
520 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) | |
521 | goto decrease_sf_crcount; | |
522 | ||
1da177e4 LT |
523 | /* clear marks on query responses */ |
524 | if (isquery) | |
525 | psf->sf_gsresp = 0; | |
526 | ||
63007727 | 527 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
528 | first*sizeof(struct igmpv3_grec)) { |
529 | if (truncate && !first) | |
530 | break; /* truncate these */ | |
531 | if (pgr) | |
532 | pgr->grec_nsrcs = htons(scount); | |
533 | if (skb) | |
534 | igmpv3_sendpack(skb); | |
b5476022 | 535 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
536 | first = 1; |
537 | scount = 0; | |
538 | } | |
539 | if (first) { | |
b5476022 | 540 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
1da177e4 LT |
541 | first = 0; |
542 | } | |
cc63f70b AD |
543 | if (!skb) |
544 | return NULL; | |
4df864c1 | 545 | psrc = skb_put(skb, sizeof(__be32)); |
1da177e4 | 546 | *psrc = psf->sf_inaddr; |
ad12583f | 547 | scount++; stotal++; |
1da177e4 LT |
548 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
549 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
a052517a | 550 | decrease_sf_crcount: |
1da177e4 LT |
551 | psf->sf_crcount--; |
552 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
553 | if (psf_prev) | |
554 | psf_prev->sf_next = psf->sf_next; | |
555 | else | |
556 | *psf_list = psf->sf_next; | |
557 | kfree(psf); | |
558 | continue; | |
559 | } | |
560 | } | |
561 | psf_prev = psf; | |
562 | } | |
ad12583f DS |
563 | |
564 | empty_source: | |
565 | if (!stotal) { | |
566 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
567 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
568 | return skb; | |
569 | if (pmc->crcount || isquery) { | |
570 | /* make sure we have room for group header */ | |
c71151f0 | 571 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
572 | igmpv3_sendpack(skb); |
573 | skb = NULL; /* add_grhead will get a new one */ | |
574 | } | |
b5476022 | 575 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
ad12583f DS |
576 | } |
577 | } | |
1da177e4 LT |
578 | if (pgr) |
579 | pgr->grec_nsrcs = htons(scount); | |
580 | ||
581 | if (isquery) | |
582 | pmc->gsquery = 0; /* clear query state on report */ | |
583 | return skb; | |
584 | } | |
585 | ||
586 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
587 | { | |
588 | struct sk_buff *skb = NULL; | |
87a8a2ae | 589 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
590 | int type; |
591 | ||
592 | if (!pmc) { | |
1d7138de ED |
593 | rcu_read_lock(); |
594 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
595 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
596 | continue; | |
df2cf4a7 | 597 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
87a8a2ae | 598 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 599 | continue; |
1da177e4 LT |
600 | spin_lock_bh(&pmc->lock); |
601 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
602 | type = IGMPV3_MODE_IS_EXCLUDE; | |
603 | else | |
604 | type = IGMPV3_MODE_IS_INCLUDE; | |
605 | skb = add_grec(skb, pmc, type, 0, 0); | |
606 | spin_unlock_bh(&pmc->lock); | |
607 | } | |
1d7138de | 608 | rcu_read_unlock(); |
1da177e4 LT |
609 | } else { |
610 | spin_lock_bh(&pmc->lock); | |
611 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
612 | type = IGMPV3_MODE_IS_EXCLUDE; | |
613 | else | |
614 | type = IGMPV3_MODE_IS_INCLUDE; | |
615 | skb = add_grec(skb, pmc, type, 0, 0); | |
616 | spin_unlock_bh(&pmc->lock); | |
617 | } | |
618 | if (!skb) | |
619 | return 0; | |
620 | return igmpv3_sendpack(skb); | |
621 | } | |
622 | ||
623 | /* | |
624 | * remove zero-count source records from a source filter list | |
625 | */ | |
626 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
627 | { | |
628 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
629 | ||
630 | psf_prev = NULL; | |
c71151f0 | 631 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
632 | psf_next = psf->sf_next; |
633 | if (psf->sf_crcount == 0) { | |
634 | if (psf_prev) | |
635 | psf_prev->sf_next = psf->sf_next; | |
636 | else | |
637 | *ppsf = psf->sf_next; | |
638 | kfree(psf); | |
639 | } else | |
640 | psf_prev = psf; | |
641 | } | |
642 | } | |
643 | ||
3580d04a ED |
644 | static void kfree_pmc(struct ip_mc_list *pmc) |
645 | { | |
646 | ip_sf_list_clear_all(pmc->sources); | |
647 | ip_sf_list_clear_all(pmc->tomb); | |
648 | kfree(pmc); | |
649 | } | |
650 | ||
1da177e4 LT |
651 | static void igmpv3_send_cr(struct in_device *in_dev) |
652 | { | |
653 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
654 | struct sk_buff *skb = NULL; | |
655 | int type, dtype; | |
656 | ||
1d7138de | 657 | rcu_read_lock(); |
1da177e4 LT |
658 | spin_lock_bh(&in_dev->mc_tomb_lock); |
659 | ||
660 | /* deleted MCA's */ | |
661 | pmc_prev = NULL; | |
c71151f0 | 662 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
663 | pmc_next = pmc->next; |
664 | if (pmc->sfmode == MCAST_INCLUDE) { | |
665 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
666 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
667 | skb = add_grec(skb, pmc, type, 1, 0); | |
668 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
669 | } | |
670 | if (pmc->crcount) { | |
1da177e4 LT |
671 | if (pmc->sfmode == MCAST_EXCLUDE) { |
672 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
673 | skb = add_grec(skb, pmc, type, 1, 0); | |
674 | } | |
ad12583f | 675 | pmc->crcount--; |
1da177e4 LT |
676 | if (pmc->crcount == 0) { |
677 | igmpv3_clear_zeros(&pmc->tomb); | |
678 | igmpv3_clear_zeros(&pmc->sources); | |
679 | } | |
680 | } | |
681 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
682 | if (pmc_prev) | |
683 | pmc_prev->next = pmc_next; | |
684 | else | |
685 | in_dev->mc_tomb = pmc_next; | |
686 | in_dev_put(pmc->interface); | |
3580d04a | 687 | kfree_pmc(pmc); |
1da177e4 LT |
688 | } else |
689 | pmc_prev = pmc; | |
690 | } | |
691 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
692 | ||
693 | /* change recs */ | |
1d7138de | 694 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
695 | spin_lock_bh(&pmc->lock); |
696 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
697 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
698 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
699 | } else { | |
700 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
701 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
702 | } | |
703 | skb = add_grec(skb, pmc, type, 0, 0); | |
704 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
705 | ||
706 | /* filter mode changes */ | |
707 | if (pmc->crcount) { | |
1da177e4 LT |
708 | if (pmc->sfmode == MCAST_EXCLUDE) |
709 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
710 | else | |
711 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
712 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 713 | pmc->crcount--; |
1da177e4 LT |
714 | } |
715 | spin_unlock_bh(&pmc->lock); | |
716 | } | |
1d7138de | 717 | rcu_read_unlock(); |
1da177e4 LT |
718 | |
719 | if (!skb) | |
720 | return; | |
721 | (void) igmpv3_sendpack(skb); | |
722 | } | |
723 | ||
724 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
725 | int type) | |
726 | { | |
727 | struct sk_buff *skb; | |
728 | struct iphdr *iph; | |
729 | struct igmphdr *ih; | |
730 | struct rtable *rt; | |
731 | struct net_device *dev = in_dev->dev; | |
877acedc | 732 | struct net *net = dev_net(dev); |
63007727 | 733 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 734 | struct flowi4 fl4; |
63007727 | 735 | __be32 dst; |
66088243 | 736 | int hlen, tlen; |
1da177e4 LT |
737 | |
738 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
739 | return igmpv3_send_report(in_dev, pmc); | |
df2cf4a7 | 740 | |
87a8a2ae | 741 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 PD |
742 | return 0; |
743 | ||
744 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
1da177e4 LT |
745 | dst = IGMP_ALL_ROUTER; |
746 | else | |
747 | dst = group; | |
748 | ||
31e4543d | 749 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
750 | 0, 0, |
751 | IPPROTO_IGMP, 0, dev->ifindex); | |
752 | if (IS_ERR(rt)) | |
753 | return -1; | |
754 | ||
66088243 HX |
755 | hlen = LL_RESERVED_SPACE(dev); |
756 | tlen = dev->needed_tailroom; | |
757 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
51456b29 | 758 | if (!skb) { |
1da177e4 LT |
759 | ip_rt_put(rt); |
760 | return -1; | |
761 | } | |
9d4a0314 | 762 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 763 | |
d8d1f30b | 764 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 765 | |
66088243 | 766 | skb_reserve(skb, hlen); |
1da177e4 | 767 | |
7e28ecc2 | 768 | skb_reset_network_header(skb); |
eddc9ec5 | 769 | iph = ip_hdr(skb); |
7e28ecc2 | 770 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
771 | |
772 | iph->version = 4; | |
773 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
774 | iph->tos = 0xc0; | |
775 | iph->frag_off = htons(IP_DF); | |
776 | iph->ttl = 1; | |
777 | iph->daddr = dst; | |
492f64ce | 778 | iph->saddr = fl4.saddr; |
1da177e4 | 779 | iph->protocol = IPPROTO_IGMP; |
b6a7719a | 780 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
781 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
782 | ((u8 *)&iph[1])[1] = 4; | |
783 | ((u8 *)&iph[1])[2] = 0; | |
784 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 | 785 | |
4df864c1 | 786 | ih = skb_put(skb, sizeof(struct igmphdr)); |
a7e9ff73 JK |
787 | ih->type = type; |
788 | ih->code = 0; | |
789 | ih->csum = 0; | |
790 | ih->group = group; | |
791 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 792 | |
33224b16 | 793 | return ip_local_out(net, skb->sk, skb); |
1da177e4 LT |
794 | } |
795 | ||
e99e88a9 | 796 | static void igmp_gq_timer_expire(struct timer_list *t) |
1da177e4 | 797 | { |
e99e88a9 | 798 | struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer); |
1da177e4 LT |
799 | |
800 | in_dev->mr_gq_running = 0; | |
801 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 802 | in_dev_put(in_dev); |
1da177e4 LT |
803 | } |
804 | ||
e99e88a9 | 805 | static void igmp_ifc_timer_expire(struct timer_list *t) |
1da177e4 | 806 | { |
e99e88a9 | 807 | struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer); |
1da177e4 LT |
808 | |
809 | igmpv3_send_cr(in_dev); | |
810 | if (in_dev->mr_ifc_count) { | |
811 | in_dev->mr_ifc_count--; | |
cab70040 WM |
812 | igmp_ifc_start_timer(in_dev, |
813 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 814 | } |
e2401654 | 815 | in_dev_put(in_dev); |
1da177e4 LT |
816 | } |
817 | ||
818 | static void igmp_ifc_event(struct in_device *in_dev) | |
819 | { | |
165094af | 820 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
821 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
822 | return; | |
165094af | 823 | in_dev->mr_ifc_count = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
824 | igmp_ifc_start_timer(in_dev, 1); |
825 | } | |
826 | ||
827 | ||
e99e88a9 | 828 | static void igmp_timer_expire(struct timer_list *t) |
1da177e4 | 829 | { |
e99e88a9 | 830 | struct ip_mc_list *im = from_timer(im, t, timer); |
1da177e4 LT |
831 | struct in_device *in_dev = im->interface; |
832 | ||
833 | spin_lock(&im->lock); | |
a7e9ff73 | 834 | im->tm_running = 0; |
1da177e4 | 835 | |
4fb7253e | 836 | if (im->unsolicit_count && --im->unsolicit_count) |
cab70040 | 837 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
4fb7253e | 838 | |
1da177e4 LT |
839 | im->reporter = 1; |
840 | spin_unlock(&im->lock); | |
841 | ||
842 | if (IGMP_V1_SEEN(in_dev)) | |
843 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
844 | else if (IGMP_V2_SEEN(in_dev)) | |
845 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
846 | else | |
847 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
848 | ||
849 | ip_ma_put(im); | |
850 | } | |
851 | ||
ad12583f | 852 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 853 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
854 | { |
855 | struct ip_sf_list *psf; | |
856 | int i, scount; | |
857 | ||
ad12583f | 858 | scount = 0; |
c71151f0 | 859 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
860 | if (scount == nsrcs) |
861 | break; | |
c71151f0 | 862 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 863 | /* skip inactive filters */ |
e05c4ad3 | 864 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
865 | pmc->sfcount[MCAST_EXCLUDE] != |
866 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 867 | break; |
ad12583f DS |
868 | if (srcs[i] == psf->sf_inaddr) { |
869 | scount++; | |
870 | break; | |
871 | } | |
872 | } | |
873 | } | |
874 | pmc->gsquery = 0; | |
875 | if (scount == nsrcs) /* all sources excluded */ | |
876 | return 0; | |
877 | return 1; | |
878 | } | |
879 | ||
ea4d9e72 | 880 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
881 | { |
882 | struct ip_sf_list *psf; | |
883 | int i, scount; | |
884 | ||
885 | if (pmc->sfmode == MCAST_EXCLUDE) | |
886 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
887 | ||
888 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 889 | scount = 0; |
c71151f0 | 890 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
891 | if (scount == nsrcs) |
892 | break; | |
c71151f0 | 893 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
894 | if (srcs[i] == psf->sf_inaddr) { |
895 | psf->sf_gsresp = 1; | |
896 | scount++; | |
897 | break; | |
898 | } | |
899 | } | |
ad12583f DS |
900 | if (!scount) { |
901 | pmc->gsquery = 0; | |
902 | return 0; | |
903 | } | |
904 | pmc->gsquery = 1; | |
905 | return 1; | |
1da177e4 LT |
906 | } |
907 | ||
d679c532 ED |
908 | /* return true if packet was dropped */ |
909 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
910 | { |
911 | struct ip_mc_list *im; | |
87a8a2ae | 912 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
913 | |
914 | /* Timers are only set for non-local groups */ | |
915 | ||
916 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 917 | return false; |
87a8a2ae | 918 | if (ipv4_is_local_multicast(group) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 919 | return false; |
1da177e4 | 920 | |
1d7138de ED |
921 | rcu_read_lock(); |
922 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
923 | if (im->multiaddr == group) { |
924 | igmp_stop_timer(im); | |
925 | break; | |
926 | } | |
927 | } | |
1d7138de | 928 | rcu_read_unlock(); |
d679c532 | 929 | return false; |
1da177e4 LT |
930 | } |
931 | ||
d679c532 ED |
932 | /* return true if packet was dropped */ |
933 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
934 | int len) |
935 | { | |
d9edf9e2 ACM |
936 | struct igmphdr *ih = igmp_hdr(skb); |
937 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 938 | struct ip_mc_list *im; |
63007727 | 939 | __be32 group = ih->group; |
1da177e4 LT |
940 | int max_delay; |
941 | int mark = 0; | |
87a8a2ae | 942 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
943 | |
944 | ||
5b7c8406 | 945 | if (len == 8) { |
1da177e4 LT |
946 | if (ih->code == 0) { |
947 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 948 | |
436f7c20 | 949 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
1da177e4 | 950 | in_dev->mr_v1_seen = jiffies + |
966c37f2 HL |
951 | (in_dev->mr_qrv * in_dev->mr_qi) + |
952 | in_dev->mr_qri; | |
1da177e4 LT |
953 | group = 0; |
954 | } else { | |
955 | /* v2 router present */ | |
956 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
957 | in_dev->mr_v2_seen = jiffies + | |
966c37f2 HL |
958 | (in_dev->mr_qrv * in_dev->mr_qi) + |
959 | in_dev->mr_qri; | |
1da177e4 LT |
960 | } |
961 | /* cancel the interface change timer */ | |
962 | in_dev->mr_ifc_count = 0; | |
963 | if (del_timer(&in_dev->mr_ifc_timer)) | |
964 | __in_dev_put(in_dev); | |
965 | /* clear deleted report items */ | |
966 | igmpv3_clear_delrec(in_dev); | |
967 | } else if (len < 12) { | |
d679c532 | 968 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
969 | } else if (IGMP_V1_SEEN(in_dev)) { |
970 | /* This is a v3 query with v1 queriers present */ | |
436f7c20 | 971 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
5b7c8406 DS |
972 | group = 0; |
973 | } else if (IGMP_V2_SEEN(in_dev)) { | |
974 | /* this is a v3 query with v2 queriers present; | |
975 | * Interpretation of the max_delay code is problematic here. | |
976 | * A real v2 host would use ih_code directly, while v3 has a | |
977 | * different encoding. We use the v3 encoding as more likely | |
978 | * to be intended in a v3 query. | |
979 | */ | |
980 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
981 | if (!max_delay) |
982 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
983 | } else { /* v3 */ |
984 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 985 | return true; |
e905a9ed | 986 | |
d9edf9e2 | 987 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 988 | if (ih3->nsrcs) { |
e905a9ed | 989 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 990 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 991 | return true; |
d9edf9e2 | 992 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
993 | } |
994 | ||
995 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
996 | if (!max_delay) | |
997 | max_delay = 1; /* can't mod w/ 0 */ | |
998 | in_dev->mr_maxdelay = max_delay; | |
966c37f2 HL |
999 | |
1000 | /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently | |
1001 | * received value was zero, use the default or statically | |
1002 | * configured value. | |
1003 | */ | |
1004 | in_dev->mr_qrv = ih3->qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1005 | in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL; | |
1006 | ||
1007 | /* RFC3376, 8.3. Query Response Interval: | |
1008 | * The number of seconds represented by the [Query Response | |
1009 | * Interval] must be less than the [Query Interval]. | |
1010 | */ | |
1011 | if (in_dev->mr_qri >= in_dev->mr_qi) | |
1012 | in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ; | |
1013 | ||
1da177e4 LT |
1014 | if (!group) { /* general query */ |
1015 | if (ih3->nsrcs) | |
b47bd8d2 | 1016 | return true; /* no sources allowed */ |
1da177e4 | 1017 | igmp_gq_start_timer(in_dev); |
d679c532 | 1018 | return false; |
1da177e4 LT |
1019 | } |
1020 | /* mark sources to include, if group & source-specific */ | |
1021 | mark = ih3->nsrcs != 0; | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * - Start the timers in all of our membership records | |
1026 | * that the query applies to for the interface on | |
1027 | * which the query arrived excl. those that belong | |
1028 | * to a "local" group (224.0.0.X) | |
1029 | * - For timers already running check if they need to | |
1030 | * be reset. | |
1031 | * - Use the igmp->igmp_code field as the maximum | |
1032 | * delay possible | |
1033 | */ | |
1d7138de ED |
1034 | rcu_read_lock(); |
1035 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
1036 | int changed; |
1037 | ||
1da177e4 LT |
1038 | if (group && group != im->multiaddr) |
1039 | continue; | |
1040 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1041 | continue; | |
df2cf4a7 | 1042 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1043 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1044 | continue; |
1da177e4 LT |
1045 | spin_lock_bh(&im->lock); |
1046 | if (im->tm_running) | |
1047 | im->gsquery = im->gsquery && mark; | |
1048 | else | |
1049 | im->gsquery = mark; | |
ad12583f | 1050 | changed = !im->gsquery || |
e905a9ed | 1051 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 1052 | spin_unlock_bh(&im->lock); |
ad12583f DS |
1053 | if (changed) |
1054 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 1055 | } |
1d7138de | 1056 | rcu_read_unlock(); |
d679c532 | 1057 | return false; |
1da177e4 LT |
1058 | } |
1059 | ||
9a57a9d2 | 1060 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
1061 | int igmp_rcv(struct sk_buff *skb) |
1062 | { | |
1063 | /* This basically follows the spec line by line -- see RFC1112 */ | |
1064 | struct igmphdr *ih; | |
c7b725be DA |
1065 | struct net_device *dev = skb->dev; |
1066 | struct in_device *in_dev; | |
1da177e4 | 1067 | int len = skb->len; |
d679c532 | 1068 | bool dropped = true; |
1da177e4 | 1069 | |
c7b725be DA |
1070 | if (netif_is_l3_master(dev)) { |
1071 | dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif); | |
1072 | if (!dev) | |
1073 | goto drop; | |
1074 | } | |
1075 | ||
1076 | in_dev = __in_dev_get_rcu(dev); | |
51456b29 | 1077 | if (!in_dev) |
cd557bc1 | 1078 | goto drop; |
1da177e4 | 1079 | |
fb286bb2 | 1080 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 1081 | goto drop; |
fb286bb2 | 1082 | |
de08dc1a TH |
1083 | if (skb_checksum_simple_validate(skb)) |
1084 | goto drop; | |
1da177e4 | 1085 | |
d9edf9e2 | 1086 | ih = igmp_hdr(skb); |
1da177e4 LT |
1087 | switch (ih->type) { |
1088 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 1089 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
1090 | break; |
1091 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1092 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 1093 | /* Is it our report looped back? */ |
c7537967 | 1094 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1095 | break; |
24c69275 DS |
1096 | /* don't rely on MC router hearing unicast reports */ |
1097 | if (skb->pkt_type == PACKET_MULTICAST || | |
1098 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1099 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1100 | break; |
1101 | case IGMP_PIM: | |
1102 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1103 | return pim_rcv_v1(skb); |
1104 | #endif | |
c6b471e6 | 1105 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1106 | case IGMP_DVMRP: |
1107 | case IGMP_TRACE: | |
1108 | case IGMP_HOST_LEAVE_MESSAGE: | |
1109 | case IGMP_MTRACE: | |
1110 | case IGMP_MTRACE_RESP: | |
1111 | break; | |
1112 | default: | |
dd1c1853 | 1113 | break; |
1da177e4 | 1114 | } |
fb286bb2 | 1115 | |
cd557bc1 | 1116 | drop: |
d679c532 ED |
1117 | if (dropped) |
1118 | kfree_skb(skb); | |
1119 | else | |
1120 | consume_skb(skb); | |
1da177e4 LT |
1121 | return 0; |
1122 | } | |
1123 | ||
1124 | #endif | |
1125 | ||
1126 | ||
1127 | /* | |
1128 | * Add a filter to a device | |
1129 | */ | |
1130 | ||
63007727 | 1131 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1132 | { |
1133 | char buf[MAX_ADDR_LEN]; | |
1134 | struct net_device *dev = in_dev->dev; | |
1135 | ||
1136 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1137 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1138 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1139 | routine. Something sort of: |
1140 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1141 | --ANK | |
1142 | */ | |
1143 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1144 | dev_mc_add(dev, buf); |
1da177e4 LT |
1145 | } |
1146 | ||
1147 | /* | |
1148 | * Remove a filter from a device | |
1149 | */ | |
1150 | ||
63007727 | 1151 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1152 | { |
1153 | char buf[MAX_ADDR_LEN]; | |
1154 | struct net_device *dev = in_dev->dev; | |
1155 | ||
1156 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1157 | dev_mc_del(dev, buf); |
1da177e4 LT |
1158 | } |
1159 | ||
1160 | #ifdef CONFIG_IP_MULTICAST | |
1161 | /* | |
1162 | * deleted ip_mc_list manipulation | |
1163 | */ | |
9fb20801 FF |
1164 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, |
1165 | gfp_t gfp) | |
1da177e4 LT |
1166 | { |
1167 | struct ip_mc_list *pmc; | |
165094af | 1168 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1169 | |
1170 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1171 | * are actually used. In particular, the refcnt and users are not | |
1172 | * used for management of the delete list. Using the same structure | |
1173 | * for deleted items allows change reports to use common code with | |
1174 | * non-deleted or query-response MCA's. | |
1175 | */ | |
9fb20801 | 1176 | pmc = kzalloc(sizeof(*pmc), gfp); |
1da177e4 LT |
1177 | if (!pmc) |
1178 | return; | |
b4846fc3 | 1179 | spin_lock_init(&pmc->lock); |
1da177e4 LT |
1180 | spin_lock_bh(&im->lock); |
1181 | pmc->interface = im->interface; | |
1182 | in_dev_hold(in_dev); | |
1183 | pmc->multiaddr = im->multiaddr; | |
165094af | 1184 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1185 | pmc->sfmode = im->sfmode; |
1186 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1187 | struct ip_sf_list *psf; | |
1188 | ||
1189 | pmc->tomb = im->tomb; | |
1190 | pmc->sources = im->sources; | |
1191 | im->tomb = im->sources = NULL; | |
c71151f0 | 1192 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1193 | psf->sf_crcount = pmc->crcount; |
1194 | } | |
1195 | spin_unlock_bh(&im->lock); | |
1196 | ||
1197 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1198 | pmc->next = in_dev->mc_tomb; | |
1199 | in_dev->mc_tomb = pmc; | |
1200 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1201 | } | |
1202 | ||
24803f38 HL |
1203 | /* |
1204 | * restore ip_mc_list deleted records | |
1205 | */ | |
1206 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1da177e4 LT |
1207 | { |
1208 | struct ip_mc_list *pmc, *pmc_prev; | |
24803f38 HL |
1209 | struct ip_sf_list *psf; |
1210 | struct net *net = dev_net(in_dev->dev); | |
1211 | __be32 multiaddr = im->multiaddr; | |
1da177e4 LT |
1212 | |
1213 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1214 | pmc_prev = NULL; | |
c71151f0 | 1215 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1216 | if (pmc->multiaddr == multiaddr) |
1217 | break; | |
1218 | pmc_prev = pmc; | |
1219 | } | |
1220 | if (pmc) { | |
1221 | if (pmc_prev) | |
1222 | pmc_prev->next = pmc->next; | |
1223 | else | |
1224 | in_dev->mc_tomb = pmc->next; | |
1225 | } | |
1226 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
24803f38 HL |
1227 | |
1228 | spin_lock_bh(&im->lock); | |
1da177e4 | 1229 | if (pmc) { |
24803f38 | 1230 | im->interface = pmc->interface; |
08d3ffcc | 1231 | if (im->sfmode == MCAST_INCLUDE) { |
e5b1c6c6 ED |
1232 | swap(im->tomb, pmc->tomb); |
1233 | swap(im->sources, pmc->sources); | |
24803f38 | 1234 | for (psf = im->sources; psf; psf = psf->sf_next) |
6e2059b5 HL |
1235 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1236 | } else { | |
1237 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; | |
1da177e4 LT |
1238 | } |
1239 | in_dev_put(pmc->interface); | |
3580d04a | 1240 | kfree_pmc(pmc); |
1da177e4 | 1241 | } |
24803f38 | 1242 | spin_unlock_bh(&im->lock); |
1da177e4 LT |
1243 | } |
1244 | ||
24803f38 HL |
1245 | /* |
1246 | * flush ip_mc_list deleted records | |
1247 | */ | |
1da177e4 LT |
1248 | static void igmpv3_clear_delrec(struct in_device *in_dev) |
1249 | { | |
1250 | struct ip_mc_list *pmc, *nextpmc; | |
1251 | ||
1252 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1253 | pmc = in_dev->mc_tomb; | |
1254 | in_dev->mc_tomb = NULL; | |
1255 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1256 | ||
1257 | for (; pmc; pmc = nextpmc) { | |
1258 | nextpmc = pmc->next; | |
1259 | ip_mc_clear_src(pmc); | |
1260 | in_dev_put(pmc->interface); | |
3580d04a | 1261 | kfree_pmc(pmc); |
1da177e4 LT |
1262 | } |
1263 | /* clear dead sources, too */ | |
1d7138de ED |
1264 | rcu_read_lock(); |
1265 | for_each_pmc_rcu(in_dev, pmc) { | |
3580d04a | 1266 | struct ip_sf_list *psf; |
1da177e4 LT |
1267 | |
1268 | spin_lock_bh(&pmc->lock); | |
1269 | psf = pmc->tomb; | |
1270 | pmc->tomb = NULL; | |
1271 | spin_unlock_bh(&pmc->lock); | |
3580d04a | 1272 | ip_sf_list_clear_all(psf); |
1da177e4 | 1273 | } |
1d7138de | 1274 | rcu_read_unlock(); |
1da177e4 LT |
1275 | } |
1276 | #endif | |
1277 | ||
9fb20801 | 1278 | static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp) |
1da177e4 LT |
1279 | { |
1280 | struct in_device *in_dev = im->interface; | |
1281 | #ifdef CONFIG_IP_MULTICAST | |
87a8a2ae | 1282 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1283 | int reporter; |
1284 | #endif | |
1285 | ||
1286 | if (im->loaded) { | |
1287 | im->loaded = 0; | |
1288 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1289 | } | |
1290 | ||
1291 | #ifdef CONFIG_IP_MULTICAST | |
1292 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1293 | return; | |
87a8a2ae | 1294 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1295 | return; |
1da177e4 LT |
1296 | |
1297 | reporter = im->reporter; | |
1298 | igmp_stop_timer(im); | |
1299 | ||
1300 | if (!in_dev->dead) { | |
1301 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1302 | return; |
1da177e4 LT |
1303 | if (IGMP_V2_SEEN(in_dev)) { |
1304 | if (reporter) | |
1305 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1306 | return; |
1da177e4 LT |
1307 | } |
1308 | /* IGMPv3 */ | |
9fb20801 | 1309 | igmpv3_add_delrec(in_dev, im, gfp); |
1da177e4 LT |
1310 | |
1311 | igmp_ifc_event(in_dev); | |
1312 | } | |
1da177e4 | 1313 | #endif |
1da177e4 LT |
1314 | } |
1315 | ||
9fb20801 FF |
1316 | static void igmp_group_dropped(struct ip_mc_list *im) |
1317 | { | |
1318 | __igmp_group_dropped(im, GFP_KERNEL); | |
1319 | } | |
1320 | ||
0ae0d60a | 1321 | static void igmp_group_added(struct ip_mc_list *im) |
1da177e4 LT |
1322 | { |
1323 | struct in_device *in_dev = im->interface; | |
dcd87999 | 1324 | #ifdef CONFIG_IP_MULTICAST |
87a8a2ae | 1325 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1326 | #endif |
1da177e4 LT |
1327 | |
1328 | if (im->loaded == 0) { | |
1329 | im->loaded = 1; | |
1330 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1331 | } | |
1332 | ||
1333 | #ifdef CONFIG_IP_MULTICAST | |
1334 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1335 | return; | |
87a8a2ae | 1336 | if (ipv4_is_local_multicast(im->multiaddr) && !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1337 | return; |
1da177e4 LT |
1338 | |
1339 | if (in_dev->dead) | |
1340 | return; | |
ff06525f HL |
1341 | |
1342 | im->unsolicit_count = net->ipv4.sysctl_igmp_qrv; | |
1da177e4 LT |
1343 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { |
1344 | spin_lock_bh(&im->lock); | |
436f7c20 | 1345 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); |
1da177e4 LT |
1346 | spin_unlock_bh(&im->lock); |
1347 | return; | |
1348 | } | |
1349 | /* else, v3 */ | |
1350 | ||
6e2059b5 HL |
1351 | /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should |
1352 | * not send filter-mode change record as the mode should be from | |
1353 | * IN() to IN(A). | |
1354 | */ | |
0ae0d60a | 1355 | if (im->sfmode == MCAST_EXCLUDE) |
6e2059b5 HL |
1356 | im->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1357 | ||
1da177e4 LT |
1358 | igmp_ifc_event(in_dev); |
1359 | #endif | |
1360 | } | |
1361 | ||
1362 | ||
1363 | /* | |
1364 | * Multicast list managers | |
1365 | */ | |
1366 | ||
e9897071 ED |
1367 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1368 | { | |
c70eba74 | 1369 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1370 | } |
1371 | ||
1372 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1373 | struct ip_mc_list *im) | |
1374 | { | |
1375 | struct ip_mc_list __rcu **mc_hash; | |
1376 | u32 hash; | |
1377 | ||
1378 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1379 | if (mc_hash) { | |
1380 | hash = ip_mc_hash(im); | |
c70eba74 | 1381 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1382 | rcu_assign_pointer(mc_hash[hash], im); |
1383 | return; | |
1384 | } | |
1385 | ||
1386 | /* do not use a hash table for small number of items */ | |
1387 | if (in_dev->mc_count < 4) | |
1388 | return; | |
1389 | ||
1390 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1391 | GFP_KERNEL); | |
1392 | if (!mc_hash) | |
1393 | return; | |
1394 | ||
1395 | for_each_pmc_rtnl(in_dev, im) { | |
1396 | hash = ip_mc_hash(im); | |
c70eba74 | 1397 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1398 | RCU_INIT_POINTER(mc_hash[hash], im); |
1399 | } | |
1400 | ||
1401 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1402 | } | |
1403 | ||
1404 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1405 | struct ip_mc_list *im) | |
1406 | { | |
1407 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1408 | struct ip_mc_list *aux; | |
1409 | ||
1410 | if (!mc_hash) | |
1411 | return; | |
1412 | mc_hash += ip_mc_hash(im); | |
1413 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1414 | mc_hash = &aux->next_hash; | |
1415 | *mc_hash = im->next_hash; | |
1416 | } | |
1417 | ||
1da177e4 LT |
1418 | |
1419 | /* | |
1420 | * A socket has joined a multicast group on device dev. | |
1421 | */ | |
9fb20801 FF |
1422 | static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr, |
1423 | unsigned int mode, gfp_t gfp) | |
1da177e4 LT |
1424 | { |
1425 | struct ip_mc_list *im; | |
1426 | ||
1427 | ASSERT_RTNL(); | |
1428 | ||
1d7138de | 1429 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1430 | if (im->multiaddr == addr) { |
1431 | im->users++; | |
6e2059b5 | 1432 | ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0); |
1da177e4 LT |
1433 | goto out; |
1434 | } | |
1435 | } | |
1436 | ||
9fb20801 | 1437 | im = kzalloc(sizeof(*im), gfp); |
1da177e4 LT |
1438 | if (!im) |
1439 | goto out; | |
1440 | ||
a7e9ff73 JK |
1441 | im->users = 1; |
1442 | im->interface = in_dev; | |
1da177e4 | 1443 | in_dev_hold(in_dev); |
a7e9ff73 | 1444 | im->multiaddr = addr; |
1da177e4 | 1445 | /* initial mode is (EX, empty) */ |
6e2059b5 HL |
1446 | im->sfmode = mode; |
1447 | im->sfcount[mode] = 1; | |
8851ab52 | 1448 | refcount_set(&im->refcnt, 1); |
1da177e4 LT |
1449 | spin_lock_init(&im->lock); |
1450 | #ifdef CONFIG_IP_MULTICAST | |
e99e88a9 | 1451 | timer_setup(&im->timer, igmp_timer_expire, 0); |
1da177e4 | 1452 | #endif |
1d7138de ED |
1453 | |
1454 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1455 | in_dev->mc_count++; |
cf778b00 | 1456 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1457 | |
e9897071 ED |
1458 | ip_mc_hash_add(in_dev, im); |
1459 | ||
1da177e4 | 1460 | #ifdef CONFIG_IP_MULTICAST |
24803f38 | 1461 | igmpv3_del_delrec(in_dev, im); |
1da177e4 | 1462 | #endif |
0ae0d60a | 1463 | igmp_group_added(im); |
1da177e4 LT |
1464 | if (!in_dev->dead) |
1465 | ip_rt_multicast_event(in_dev); | |
1466 | out: | |
1467 | return; | |
1468 | } | |
6e2059b5 | 1469 | |
9fb20801 FF |
1470 | void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) |
1471 | { | |
1472 | ____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp); | |
1473 | } | |
1474 | EXPORT_SYMBOL(__ip_mc_inc_group); | |
1475 | ||
6e2059b5 HL |
1476 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1477 | { | |
1478 | __ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE); | |
1479 | } | |
4bc2f18b | 1480 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1481 | |
9afd85c9 LL |
1482 | static int ip_mc_check_iphdr(struct sk_buff *skb) |
1483 | { | |
1484 | const struct iphdr *iph; | |
1485 | unsigned int len; | |
1486 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1487 | ||
1488 | if (!pskb_may_pull(skb, offset)) | |
1489 | return -EINVAL; | |
1490 | ||
1491 | iph = ip_hdr(skb); | |
1492 | ||
1493 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1494 | return -EINVAL; | |
1495 | ||
1496 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1497 | ||
1498 | if (!pskb_may_pull(skb, offset)) | |
1499 | return -EINVAL; | |
1500 | ||
1501 | iph = ip_hdr(skb); | |
1502 | ||
1503 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1504 | return -EINVAL; | |
1505 | ||
1506 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1507 | if (skb->len < len || len < offset) | |
1508 | return -EINVAL; | |
1509 | ||
1510 | skb_set_transport_header(skb, offset); | |
1511 | ||
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1516 | { | |
1517 | unsigned int len = skb_transport_offset(skb); | |
1518 | ||
1519 | len += sizeof(struct igmpv3_report); | |
1520 | ||
a2e2ca3b | 1521 | return ip_mc_may_pull(skb, len) ? 0 : -EINVAL; |
9afd85c9 LL |
1522 | } |
1523 | ||
1524 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1525 | { | |
a2e2ca3b LL |
1526 | unsigned int transport_len = ip_transport_len(skb); |
1527 | unsigned int len; | |
9afd85c9 LL |
1528 | |
1529 | /* IGMPv{1,2}? */ | |
a2e2ca3b | 1530 | if (transport_len != sizeof(struct igmphdr)) { |
9afd85c9 | 1531 | /* or IGMPv3? */ |
a2e2ca3b LL |
1532 | if (transport_len < sizeof(struct igmpv3_query)) |
1533 | return -EINVAL; | |
1534 | ||
1535 | len = skb_transport_offset(skb) + sizeof(struct igmpv3_query); | |
1536 | if (!ip_mc_may_pull(skb, len)) | |
9afd85c9 LL |
1537 | return -EINVAL; |
1538 | } | |
1539 | ||
1540 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1541 | * all-systems destination addresses (224.0.0.1) for general queries | |
1542 | */ | |
1543 | if (!igmp_hdr(skb)->group && | |
1544 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1545 | return -EINVAL; | |
1546 | ||
1547 | return 0; | |
1548 | } | |
1549 | ||
1550 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1551 | { | |
1552 | switch (igmp_hdr(skb)->type) { | |
1553 | case IGMP_HOST_LEAVE_MESSAGE: | |
1554 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1555 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
9afd85c9 LL |
1556 | return 0; |
1557 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1558 | return ip_mc_check_igmp_reportv3(skb); | |
1559 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1560 | return ip_mc_check_igmp_query(skb); | |
1561 | default: | |
1562 | return -ENOMSG; | |
1563 | } | |
1564 | } | |
1565 | ||
1566 | static inline __sum16 ip_mc_validate_checksum(struct sk_buff *skb) | |
1567 | { | |
1568 | return skb_checksum_simple_validate(skb); | |
1569 | } | |
1570 | ||
a2e2ca3b | 1571 | static int ip_mc_check_igmp_csum(struct sk_buff *skb) |
9afd85c9 | 1572 | { |
9afd85c9 | 1573 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); |
a2e2ca3b LL |
1574 | unsigned int transport_len = ip_transport_len(skb); |
1575 | struct sk_buff *skb_chk; | |
9afd85c9 | 1576 | |
a2e2ca3b LL |
1577 | if (!ip_mc_may_pull(skb, len)) |
1578 | return -EINVAL; | |
9afd85c9 | 1579 | |
9afd85c9 LL |
1580 | skb_chk = skb_checksum_trimmed(skb, transport_len, |
1581 | ip_mc_validate_checksum); | |
1582 | if (!skb_chk) | |
a2e2ca3b | 1583 | return -EINVAL; |
a516993f | 1584 | |
a2e2ca3b | 1585 | if (skb_chk != skb) |
a516993f LL |
1586 | kfree_skb(skb_chk); |
1587 | ||
a2e2ca3b | 1588 | return 0; |
9afd85c9 LL |
1589 | } |
1590 | ||
1591 | /** | |
1592 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1593 | * @skb: the skb to validate | |
9afd85c9 LL |
1594 | * |
1595 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
a516993f | 1596 | * skb transport header accordingly and returns zero. |
9afd85c9 LL |
1597 | * |
1598 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1599 | * standard | |
1600 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1601 | * -ENOMEM: A memory allocation failure happened. | |
1602 | * | |
a516993f LL |
1603 | * Caller needs to set the skb network header and free any returned skb if it |
1604 | * differs from the provided skb. | |
9afd85c9 | 1605 | */ |
ba5ea614 | 1606 | int ip_mc_check_igmp(struct sk_buff *skb) |
9afd85c9 LL |
1607 | { |
1608 | int ret = ip_mc_check_iphdr(skb); | |
1609 | ||
1610 | if (ret < 0) | |
1611 | return ret; | |
1612 | ||
1613 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1614 | return -ENOMSG; | |
1615 | ||
a2e2ca3b LL |
1616 | ret = ip_mc_check_igmp_csum(skb); |
1617 | if (ret < 0) | |
1618 | return ret; | |
1619 | ||
1620 | return ip_mc_check_igmp_msg(skb); | |
9afd85c9 LL |
1621 | } |
1622 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1623 | ||
a816c7c7 | 1624 | /* |
4aa5dee4 | 1625 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1626 | */ |
4aa5dee4 | 1627 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1628 | { |
08882669 | 1629 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1630 | struct ip_mc_list *im; |
1631 | int type; | |
87a8a2ae | 1632 | struct net *net = dev_net(in_dev->dev); |
a816c7c7 | 1633 | |
4aa5dee4 JP |
1634 | ASSERT_RTNL(); |
1635 | ||
1636 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1637 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1638 | continue; | |
df2cf4a7 | 1639 | if (ipv4_is_local_multicast(im->multiaddr) && |
87a8a2ae | 1640 | !net->ipv4.sysctl_igmp_llm_reports) |
df2cf4a7 | 1641 | continue; |
a816c7c7 | 1642 | |
866f3b25 ED |
1643 | /* a failover is happening and switches |
1644 | * must be notified immediately | |
1645 | */ | |
1646 | if (IGMP_V1_SEEN(in_dev)) | |
1647 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1648 | else if (IGMP_V2_SEEN(in_dev)) | |
1649 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1650 | else | |
1651 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1652 | igmp_send_report(in_dev, im, type); | |
1653 | } | |
a816c7c7 JV |
1654 | #endif |
1655 | } | |
1656 | ||
1da177e4 LT |
1657 | /* |
1658 | * A socket has left a multicast group on device dev | |
1659 | */ | |
1660 | ||
9fb20801 | 1661 | void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) |
1da177e4 | 1662 | { |
1d7138de ED |
1663 | struct ip_mc_list *i; |
1664 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1665 | |
1da177e4 | 1666 | ASSERT_RTNL(); |
e905a9ed | 1667 | |
1d7138de ED |
1668 | for (ip = &in_dev->mc_list; |
1669 | (i = rtnl_dereference(*ip)) != NULL; | |
1670 | ip = &i->next_rcu) { | |
a7e9ff73 | 1671 | if (i->multiaddr == addr) { |
1da177e4 | 1672 | if (--i->users == 0) { |
e9897071 | 1673 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1674 | *ip = i->next_rcu; |
b8bae41e | 1675 | in_dev->mc_count--; |
9fb20801 | 1676 | __igmp_group_dropped(i, gfp); |
24cf3af3 | 1677 | ip_mc_clear_src(i); |
1da177e4 LT |
1678 | |
1679 | if (!in_dev->dead) | |
1680 | ip_rt_multicast_event(in_dev); | |
1681 | ||
1682 | ip_ma_put(i); | |
1683 | return; | |
1684 | } | |
1685 | break; | |
1686 | } | |
1687 | } | |
1688 | } | |
9fb20801 | 1689 | EXPORT_SYMBOL(__ip_mc_dec_group); |
1da177e4 | 1690 | |
75c78500 MS |
1691 | /* Device changing type */ |
1692 | ||
1693 | void ip_mc_unmap(struct in_device *in_dev) | |
1694 | { | |
1d7138de | 1695 | struct ip_mc_list *pmc; |
75c78500 MS |
1696 | |
1697 | ASSERT_RTNL(); | |
1698 | ||
1d7138de ED |
1699 | for_each_pmc_rtnl(in_dev, pmc) |
1700 | igmp_group_dropped(pmc); | |
75c78500 MS |
1701 | } |
1702 | ||
1703 | void ip_mc_remap(struct in_device *in_dev) | |
1704 | { | |
1d7138de | 1705 | struct ip_mc_list *pmc; |
75c78500 MS |
1706 | |
1707 | ASSERT_RTNL(); | |
1708 | ||
24803f38 HL |
1709 | for_each_pmc_rtnl(in_dev, pmc) { |
1710 | #ifdef CONFIG_IP_MULTICAST | |
1711 | igmpv3_del_delrec(in_dev, pmc); | |
1712 | #endif | |
0ae0d60a | 1713 | igmp_group_added(pmc); |
24803f38 | 1714 | } |
75c78500 MS |
1715 | } |
1716 | ||
1da177e4 LT |
1717 | /* Device going down */ |
1718 | ||
1719 | void ip_mc_down(struct in_device *in_dev) | |
1720 | { | |
1d7138de | 1721 | struct ip_mc_list *pmc; |
1da177e4 LT |
1722 | |
1723 | ASSERT_RTNL(); | |
1724 | ||
1d7138de ED |
1725 | for_each_pmc_rtnl(in_dev, pmc) |
1726 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1727 | |
1728 | #ifdef CONFIG_IP_MULTICAST | |
1729 | in_dev->mr_ifc_count = 0; | |
1730 | if (del_timer(&in_dev->mr_ifc_timer)) | |
1731 | __in_dev_put(in_dev); | |
1732 | in_dev->mr_gq_running = 0; | |
1733 | if (del_timer(&in_dev->mr_gq_timer)) | |
1734 | __in_dev_put(in_dev); | |
1da177e4 LT |
1735 | #endif |
1736 | ||
1737 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1738 | } | |
1739 | ||
dcd87999 | 1740 | #ifdef CONFIG_IP_MULTICAST |
966c37f2 HL |
1741 | static void ip_mc_reset(struct in_device *in_dev) |
1742 | { | |
165094af | 1743 | struct net *net = dev_net(in_dev->dev); |
966c37f2 HL |
1744 | |
1745 | in_dev->mr_qi = IGMP_QUERY_INTERVAL; | |
1746 | in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL; | |
1747 | in_dev->mr_qrv = net->ipv4.sysctl_igmp_qrv; | |
1748 | } | |
1749 | #else | |
1750 | static void ip_mc_reset(struct in_device *in_dev) | |
1751 | { | |
1752 | } | |
dcd87999 | 1753 | #endif |
966c37f2 HL |
1754 | |
1755 | void ip_mc_init_dev(struct in_device *in_dev) | |
1756 | { | |
1da177e4 LT |
1757 | ASSERT_RTNL(); |
1758 | ||
1da177e4 | 1759 | #ifdef CONFIG_IP_MULTICAST |
e99e88a9 KC |
1760 | timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0); |
1761 | timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0); | |
1da177e4 | 1762 | #endif |
966c37f2 | 1763 | ip_mc_reset(in_dev); |
1da177e4 | 1764 | |
1da177e4 LT |
1765 | spin_lock_init(&in_dev->mc_tomb_lock); |
1766 | } | |
1767 | ||
1768 | /* Device going up */ | |
1769 | ||
1770 | void ip_mc_up(struct in_device *in_dev) | |
1771 | { | |
1d7138de | 1772 | struct ip_mc_list *pmc; |
1da177e4 LT |
1773 | |
1774 | ASSERT_RTNL(); | |
1775 | ||
966c37f2 | 1776 | ip_mc_reset(in_dev); |
1da177e4 LT |
1777 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1778 | ||
24803f38 HL |
1779 | for_each_pmc_rtnl(in_dev, pmc) { |
1780 | #ifdef CONFIG_IP_MULTICAST | |
1781 | igmpv3_del_delrec(in_dev, pmc); | |
1782 | #endif | |
0ae0d60a | 1783 | igmp_group_added(pmc); |
24803f38 | 1784 | } |
1da177e4 LT |
1785 | } |
1786 | ||
1787 | /* | |
1788 | * Device is about to be destroyed: clean up. | |
1789 | */ | |
1790 | ||
1791 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1792 | { | |
1793 | struct ip_mc_list *i; | |
1794 | ||
1795 | ASSERT_RTNL(); | |
1796 | ||
1797 | /* Deactivate timers */ | |
1798 | ip_mc_down(in_dev); | |
24803f38 HL |
1799 | #ifdef CONFIG_IP_MULTICAST |
1800 | igmpv3_clear_delrec(in_dev); | |
1801 | #endif | |
1da177e4 | 1802 | |
1d7138de ED |
1803 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1804 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1805 | in_dev->mc_count--; |
1da177e4 | 1806 | ip_ma_put(i); |
1da177e4 | 1807 | } |
1da177e4 LT |
1808 | } |
1809 | ||
9e917dca | 1810 | /* RTNL is locked */ |
877acedc | 1811 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1812 | { |
1da177e4 LT |
1813 | struct net_device *dev = NULL; |
1814 | struct in_device *idev = NULL; | |
1815 | ||
1816 | if (imr->imr_ifindex) { | |
877acedc | 1817 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1818 | return idev; |
1819 | } | |
1820 | if (imr->imr_address.s_addr) { | |
9e917dca | 1821 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1822 | if (!dev) |
1823 | return NULL; | |
1da177e4 LT |
1824 | } |
1825 | ||
b23dd4fe | 1826 | if (!dev) { |
78fbfd8a DM |
1827 | struct rtable *rt = ip_route_output(net, |
1828 | imr->imr_multiaddr.s_addr, | |
1829 | 0, 0, 0); | |
b23dd4fe DM |
1830 | if (!IS_ERR(rt)) { |
1831 | dev = rt->dst.dev; | |
1832 | ip_rt_put(rt); | |
1833 | } | |
1da177e4 LT |
1834 | } |
1835 | if (dev) { | |
1836 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1837 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1838 | } |
1839 | return idev; | |
1840 | } | |
1841 | ||
1842 | /* | |
1843 | * Join a socket to a group | |
1844 | */ | |
1da177e4 LT |
1845 | |
1846 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1847 | __be32 *psfsrc) |
1da177e4 LT |
1848 | { |
1849 | struct ip_sf_list *psf, *psf_prev; | |
1850 | int rv = 0; | |
1851 | ||
1852 | psf_prev = NULL; | |
c71151f0 | 1853 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1854 | if (psf->sf_inaddr == *psfsrc) |
1855 | break; | |
1856 | psf_prev = psf; | |
1857 | } | |
1858 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1859 | /* source filter not found, or count wrong => bug */ | |
1860 | return -ESRCH; | |
1861 | } | |
1862 | psf->sf_count[sfmode]--; | |
1863 | if (psf->sf_count[sfmode] == 0) { | |
1864 | ip_rt_multicast_event(pmc->interface); | |
1865 | } | |
1866 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1867 | #ifdef CONFIG_IP_MULTICAST | |
1868 | struct in_device *in_dev = pmc->interface; | |
165094af | 1869 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1870 | #endif |
1871 | ||
1872 | /* no more filters for this source */ | |
1873 | if (psf_prev) | |
1874 | psf_prev->sf_next = psf->sf_next; | |
1875 | else | |
1876 | pmc->sources = psf->sf_next; | |
1877 | #ifdef CONFIG_IP_MULTICAST | |
1878 | if (psf->sf_oldin && | |
1879 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
165094af | 1880 | psf->sf_crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 LT |
1881 | psf->sf_next = pmc->tomb; |
1882 | pmc->tomb = psf; | |
1883 | rv = 1; | |
1884 | } else | |
1885 | #endif | |
1886 | kfree(psf); | |
1887 | } | |
1888 | return rv; | |
1889 | } | |
1890 | ||
1891 | #ifndef CONFIG_IP_MULTICAST | |
1892 | #define igmp_ifc_event(x) do { } while (0) | |
1893 | #endif | |
1894 | ||
8f935bbd AV |
1895 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1896 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1897 | { |
1898 | struct ip_mc_list *pmc; | |
1899 | int changerec = 0; | |
1900 | int i, err; | |
1901 | ||
1902 | if (!in_dev) | |
1903 | return -ENODEV; | |
1d7138de ED |
1904 | rcu_read_lock(); |
1905 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1906 | if (*pmca == pmc->multiaddr) |
1907 | break; | |
1908 | } | |
1909 | if (!pmc) { | |
1910 | /* MCA not found?? bug */ | |
1d7138de | 1911 | rcu_read_unlock(); |
1da177e4 LT |
1912 | return -ESRCH; |
1913 | } | |
1914 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1915 | rcu_read_unlock(); |
1da177e4 LT |
1916 | #ifdef CONFIG_IP_MULTICAST |
1917 | sf_markstate(pmc); | |
1918 | #endif | |
1919 | if (!delta) { | |
1920 | err = -EINVAL; | |
1921 | if (!pmc->sfcount[sfmode]) | |
1922 | goto out_unlock; | |
1923 | pmc->sfcount[sfmode]--; | |
1924 | } | |
1925 | err = 0; | |
c71151f0 | 1926 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
1927 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
1928 | ||
1929 | changerec |= rv > 0; | |
1930 | if (!err && rv < 0) | |
1931 | err = rv; | |
1932 | } | |
1933 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1934 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1935 | pmc->sfcount[MCAST_INCLUDE]) { | |
1936 | #ifdef CONFIG_IP_MULTICAST | |
1937 | struct ip_sf_list *psf; | |
165094af | 1938 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1939 | #endif |
1940 | ||
1941 | /* filter mode change */ | |
1942 | pmc->sfmode = MCAST_INCLUDE; | |
1943 | #ifdef CONFIG_IP_MULTICAST | |
165094af | 1944 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 1945 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 1946 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1947 | psf->sf_crcount = 0; |
1948 | igmp_ifc_event(pmc->interface); | |
1949 | } else if (sf_setstate(pmc) || changerec) { | |
1950 | igmp_ifc_event(pmc->interface); | |
1951 | #endif | |
1952 | } | |
1953 | out_unlock: | |
1954 | spin_unlock_bh(&pmc->lock); | |
1955 | return err; | |
1956 | } | |
1957 | ||
1958 | /* | |
1959 | * Add multicast single-source filter to the interface list | |
1960 | */ | |
1961 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1962 | __be32 *psfsrc) |
1da177e4 LT |
1963 | { |
1964 | struct ip_sf_list *psf, *psf_prev; | |
1965 | ||
1966 | psf_prev = NULL; | |
c71151f0 | 1967 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1968 | if (psf->sf_inaddr == *psfsrc) |
1969 | break; | |
1970 | psf_prev = psf; | |
1971 | } | |
1972 | if (!psf) { | |
0da974f4 | 1973 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1974 | if (!psf) |
1975 | return -ENOBUFS; | |
1da177e4 LT |
1976 | psf->sf_inaddr = *psfsrc; |
1977 | if (psf_prev) { | |
1978 | psf_prev->sf_next = psf; | |
1979 | } else | |
1980 | pmc->sources = psf; | |
1981 | } | |
1982 | psf->sf_count[sfmode]++; | |
1983 | if (psf->sf_count[sfmode] == 1) { | |
1984 | ip_rt_multicast_event(pmc->interface); | |
1985 | } | |
1986 | return 0; | |
1987 | } | |
1988 | ||
1989 | #ifdef CONFIG_IP_MULTICAST | |
1990 | static void sf_markstate(struct ip_mc_list *pmc) | |
1991 | { | |
1992 | struct ip_sf_list *psf; | |
1993 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
1994 | ||
c71151f0 | 1995 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1996 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
1997 | psf->sf_oldin = mca_xcount == | |
1998 | psf->sf_count[MCAST_EXCLUDE] && | |
1999 | !psf->sf_count[MCAST_INCLUDE]; | |
2000 | } else | |
2001 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
2002 | } | |
2003 | ||
2004 | static int sf_setstate(struct ip_mc_list *pmc) | |
2005 | { | |
ad12583f | 2006 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
2007 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
2008 | int qrv = pmc->interface->mr_qrv; | |
2009 | int new_in, rv; | |
2010 | ||
2011 | rv = 0; | |
c71151f0 | 2012 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2013 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
2014 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
2015 | !psf->sf_count[MCAST_INCLUDE]; | |
2016 | } else | |
2017 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
2018 | if (new_in) { |
2019 | if (!psf->sf_oldin) { | |
76edc605 | 2020 | struct ip_sf_list *prev = NULL; |
ad12583f | 2021 | |
c71151f0 | 2022 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
2023 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
2024 | break; | |
2025 | prev = dpsf; | |
2026 | } | |
2027 | if (dpsf) { | |
2028 | if (prev) | |
2029 | prev->sf_next = dpsf->sf_next; | |
2030 | else | |
2031 | pmc->tomb = dpsf->sf_next; | |
2032 | kfree(dpsf); | |
2033 | } | |
2034 | psf->sf_crcount = qrv; | |
2035 | rv++; | |
2036 | } | |
2037 | } else if (psf->sf_oldin) { | |
2038 | ||
2039 | psf->sf_crcount = 0; | |
2040 | /* | |
2041 | * add or update "delete" records if an active filter | |
2042 | * is now inactive | |
2043 | */ | |
c71151f0 | 2044 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
2045 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
2046 | break; | |
2047 | if (!dpsf) { | |
3ed37a6f | 2048 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
2049 | if (!dpsf) |
2050 | continue; | |
2051 | *dpsf = *psf; | |
2052 | /* pmc->lock held by callers */ | |
2053 | dpsf->sf_next = pmc->tomb; | |
2054 | pmc->tomb = dpsf; | |
2055 | } | |
2056 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
2057 | rv++; |
2058 | } | |
2059 | } | |
2060 | return rv; | |
2061 | } | |
2062 | #endif | |
2063 | ||
2064 | /* | |
2065 | * Add multicast source filter list to the interface list | |
2066 | */ | |
8f935bbd AV |
2067 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
2068 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
2069 | { |
2070 | struct ip_mc_list *pmc; | |
2071 | int isexclude; | |
2072 | int i, err; | |
2073 | ||
2074 | if (!in_dev) | |
2075 | return -ENODEV; | |
1d7138de ED |
2076 | rcu_read_lock(); |
2077 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
2078 | if (*pmca == pmc->multiaddr) |
2079 | break; | |
2080 | } | |
2081 | if (!pmc) { | |
2082 | /* MCA not found?? bug */ | |
1d7138de | 2083 | rcu_read_unlock(); |
1da177e4 LT |
2084 | return -ESRCH; |
2085 | } | |
2086 | spin_lock_bh(&pmc->lock); | |
1d7138de | 2087 | rcu_read_unlock(); |
1da177e4 LT |
2088 | |
2089 | #ifdef CONFIG_IP_MULTICAST | |
2090 | sf_markstate(pmc); | |
2091 | #endif | |
2092 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
2093 | if (!delta) | |
2094 | pmc->sfcount[sfmode]++; | |
2095 | err = 0; | |
c71151f0 | 2096 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 2097 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
2098 | if (err) |
2099 | break; | |
2100 | } | |
2101 | if (err) { | |
2102 | int j; | |
2103 | ||
685f94e6 JZ |
2104 | if (!delta) |
2105 | pmc->sfcount[sfmode]--; | |
c71151f0 | 2106 | for (j = 0; j < i; j++) |
a1889c0d | 2107 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
2108 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
2109 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 2110 | struct ip_sf_list *psf; |
165094af | 2111 | struct net *net = dev_net(pmc->interface->dev); |
cfcabdcc | 2112 | in_dev = pmc->interface; |
1da177e4 LT |
2113 | #endif |
2114 | ||
2115 | /* filter mode change */ | |
2116 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
2117 | pmc->sfmode = MCAST_EXCLUDE; | |
2118 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
2119 | pmc->sfmode = MCAST_INCLUDE; | |
2120 | #ifdef CONFIG_IP_MULTICAST | |
2121 | /* else no filters; keep old mode for reports */ | |
2122 | ||
165094af | 2123 | pmc->crcount = in_dev->mr_qrv ?: net->ipv4.sysctl_igmp_qrv; |
1da177e4 | 2124 | in_dev->mr_ifc_count = pmc->crcount; |
c71151f0 | 2125 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2126 | psf->sf_crcount = 0; |
2127 | igmp_ifc_event(in_dev); | |
2128 | } else if (sf_setstate(pmc)) { | |
2129 | igmp_ifc_event(in_dev); | |
2130 | #endif | |
2131 | } | |
2132 | spin_unlock_bh(&pmc->lock); | |
2133 | return err; | |
2134 | } | |
2135 | ||
2136 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
2137 | { | |
3580d04a | 2138 | struct ip_sf_list *tomb, *sources; |
1da177e4 | 2139 | |
c38b7d32 WC |
2140 | spin_lock_bh(&pmc->lock); |
2141 | tomb = pmc->tomb; | |
2142 | pmc->tomb = NULL; | |
2143 | sources = pmc->sources; | |
2144 | pmc->sources = NULL; | |
2145 | pmc->sfmode = MCAST_EXCLUDE; | |
2146 | pmc->sfcount[MCAST_INCLUDE] = 0; | |
2147 | pmc->sfcount[MCAST_EXCLUDE] = 1; | |
2148 | spin_unlock_bh(&pmc->lock); | |
2149 | ||
3580d04a ED |
2150 | ip_sf_list_clear_all(tomb); |
2151 | ip_sf_list_clear_all(sources); | |
1da177e4 LT |
2152 | } |
2153 | ||
54ff9ef3 MRL |
2154 | /* Join a multicast group |
2155 | */ | |
6e2059b5 HL |
2156 | static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr, |
2157 | unsigned int mode) | |
1da177e4 | 2158 | { |
8f935bbd | 2159 | __be32 addr = imr->imr_multiaddr.s_addr; |
959d10f6 | 2160 | struct ip_mc_socklist *iml, *i; |
1da177e4 LT |
2161 | struct in_device *in_dev; |
2162 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 2163 | struct net *net = sock_net(sk); |
ca9b907d | 2164 | int ifindex; |
1da177e4 | 2165 | int count = 0; |
959d10f6 ED |
2166 | int err; |
2167 | ||
2168 | ASSERT_RTNL(); | |
1da177e4 | 2169 | |
f97c1e0c | 2170 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2171 | return -EINVAL; |
2172 | ||
877acedc | 2173 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
2174 | |
2175 | if (!in_dev) { | |
1da177e4 LT |
2176 | err = -ENODEV; |
2177 | goto done; | |
2178 | } | |
2179 | ||
1da177e4 | 2180 | err = -EADDRINUSE; |
ca9b907d | 2181 | ifindex = imr->imr_ifindex; |
1d7138de | 2182 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
2183 | if (i->multi.imr_multiaddr.s_addr == addr && |
2184 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 2185 | goto done; |
1da177e4 LT |
2186 | count++; |
2187 | } | |
2188 | err = -ENOBUFS; | |
815c5270 | 2189 | if (count >= net->ipv4.sysctl_igmp_max_memberships) |
ca9b907d | 2190 | goto done; |
a7e9ff73 | 2191 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
51456b29 | 2192 | if (!iml) |
1da177e4 | 2193 | goto done; |
ca9b907d | 2194 | |
1da177e4 | 2195 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 2196 | iml->next_rcu = inet->mc_list; |
1da177e4 | 2197 | iml->sflist = NULL; |
6e2059b5 | 2198 | iml->sfmode = mode; |
cf778b00 | 2199 | rcu_assign_pointer(inet->mc_list, iml); |
6e2059b5 | 2200 | __ip_mc_inc_group(in_dev, addr, mode); |
1da177e4 | 2201 | err = 0; |
1da177e4 | 2202 | done: |
1da177e4 LT |
2203 | return err; |
2204 | } | |
6e2059b5 HL |
2205 | |
2206 | /* Join ASM (Any-Source Multicast) group | |
2207 | */ | |
2208 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
2209 | { | |
2210 | return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE); | |
2211 | } | |
4bc2f18b | 2212 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 | 2213 | |
6e2059b5 HL |
2214 | /* Join SSM (Source-Specific Multicast) group |
2215 | */ | |
2216 | int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, | |
2217 | unsigned int mode) | |
2218 | { | |
2219 | return __ip_mc_join_group(sk, imr, mode); | |
2220 | } | |
2221 | ||
1da177e4 LT |
2222 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, |
2223 | struct in_device *in_dev) | |
2224 | { | |
1d7138de | 2225 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
2226 | int err; |
2227 | ||
51456b29 | 2228 | if (!psf) { |
1da177e4 LT |
2229 | /* any-source empty exclude case */ |
2230 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2231 | iml->sfmode, 0, NULL, 0); | |
2232 | } | |
2233 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 2234 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 2235 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e FL |
2236 | /* decrease mem now to avoid the memleak warning */ |
2237 | atomic_sub(IP_SFLSIZE(psf->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2238 | kfree_rcu(psf, rcu); |
1da177e4 LT |
2239 | return err; |
2240 | } | |
2241 | ||
54ff9ef3 | 2242 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
1da177e4 LT |
2243 | { |
2244 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
2245 | struct ip_mc_socklist *iml; |
2246 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 2247 | struct in_device *in_dev; |
877acedc | 2248 | struct net *net = sock_net(sk); |
8f935bbd | 2249 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 2250 | u32 ifindex; |
acd6e00b | 2251 | int ret = -EADDRNOTAVAIL; |
1da177e4 | 2252 | |
959d10f6 ED |
2253 | ASSERT_RTNL(); |
2254 | ||
877acedc | 2255 | in_dev = ip_mc_find_dev(net, imr); |
4eba7bb1 | 2256 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
52ad353a | 2257 | ret = -ENODEV; |
2258 | goto out; | |
2259 | } | |
84b42bae | 2260 | ifindex = imr->imr_ifindex; |
1d7138de ED |
2261 | for (imlp = &inet->mc_list; |
2262 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2263 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
2264 | if (iml->multi.imr_multiaddr.s_addr != group) |
2265 | continue; | |
2266 | if (ifindex) { | |
2267 | if (iml->multi.imr_ifindex != ifindex) | |
2268 | continue; | |
2269 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2270 | iml->multi.imr_address.s_addr) | |
2271 | continue; | |
1da177e4 | 2272 | |
acd6e00b | 2273 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 2274 | |
1d7138de | 2275 | *imlp = iml->next_rcu; |
acd6e00b | 2276 | |
4eba7bb1 AL |
2277 | if (in_dev) |
2278 | ip_mc_dec_group(in_dev, group); | |
959d10f6 | 2279 | |
c85bb41e FL |
2280 | /* decrease mem now to avoid the memleak warning */ |
2281 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2282 | kfree_rcu(iml, rcu); |
acd6e00b | 2283 | return 0; |
1da177e4 | 2284 | } |
52ad353a | 2285 | out: |
959d10f6 ED |
2286 | return ret; |
2287 | } | |
193ba924 | 2288 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
2289 | |
2290 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2291 | ip_mreq_source *mreqs, int ifindex) | |
2292 | { | |
2293 | int err; | |
2294 | struct ip_mreqn imr; | |
63007727 | 2295 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
2296 | struct ip_mc_socklist *pmc; |
2297 | struct in_device *in_dev = NULL; | |
2298 | struct inet_sock *inet = inet_sk(sk); | |
2299 | struct ip_sf_socklist *psl; | |
877acedc | 2300 | struct net *net = sock_net(sk); |
8cdaaa15 | 2301 | int leavegroup = 0; |
1da177e4 LT |
2302 | int i, j, rv; |
2303 | ||
f97c1e0c | 2304 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2305 | return -EINVAL; |
2306 | ||
54ff9ef3 | 2307 | ASSERT_RTNL(); |
1da177e4 LT |
2308 | |
2309 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2310 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2311 | imr.imr_ifindex = ifindex; | |
877acedc | 2312 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2313 | |
2314 | if (!in_dev) { | |
2315 | err = -ENODEV; | |
2316 | goto done; | |
2317 | } | |
2318 | err = -EADDRNOTAVAIL; | |
2319 | ||
1d7138de | 2320 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2321 | if ((pmc->multi.imr_multiaddr.s_addr == |
2322 | imr.imr_multiaddr.s_addr) && | |
2323 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2324 | break; |
2325 | } | |
917f2f10 DS |
2326 | if (!pmc) { /* must have a prior join */ |
2327 | err = -EINVAL; | |
1da177e4 | 2328 | goto done; |
917f2f10 | 2329 | } |
1da177e4 LT |
2330 | /* if a source filter was set, must be the same mode as before */ |
2331 | if (pmc->sflist) { | |
917f2f10 DS |
2332 | if (pmc->sfmode != omode) { |
2333 | err = -EINVAL; | |
1da177e4 | 2334 | goto done; |
917f2f10 | 2335 | } |
1da177e4 LT |
2336 | } else if (pmc->sfmode != omode) { |
2337 | /* allow mode switches for empty-set filters */ | |
2338 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2339 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2340 | NULL, 0); |
2341 | pmc->sfmode = omode; | |
2342 | } | |
2343 | ||
1d7138de | 2344 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2345 | if (!add) { |
2346 | if (!psl) | |
917f2f10 | 2347 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2348 | rv = !0; |
c71151f0 | 2349 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2350 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2351 | sizeof(__be32)); |
1da177e4 LT |
2352 | if (rv == 0) |
2353 | break; | |
2354 | } | |
2355 | if (rv) /* source not found */ | |
917f2f10 | 2356 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2357 | |
8cdaaa15 DS |
2358 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2359 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2360 | leavegroup = 1; | |
2361 | goto done; | |
2362 | } | |
2363 | ||
1da177e4 | 2364 | /* update the interface filter */ |
e905a9ed | 2365 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2366 | &mreqs->imr_sourceaddr, 1); |
2367 | ||
c71151f0 | 2368 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2369 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2370 | psl->sl_count--; | |
2371 | err = 0; | |
2372 | goto done; | |
2373 | } | |
2374 | /* else, add a new source to the filter */ | |
2375 | ||
166b6b2d | 2376 | if (psl && psl->sl_count >= net->ipv4.sysctl_igmp_max_msf) { |
1da177e4 LT |
2377 | err = -ENOBUFS; |
2378 | goto done; | |
2379 | } | |
2380 | if (!psl || psl->sl_count == psl->sl_max) { | |
2381 | struct ip_sf_socklist *newpsl; | |
2382 | int count = IP_SFBLOCK; | |
2383 | ||
2384 | if (psl) | |
2385 | count += psl->sl_max; | |
8b3a7005 | 2386 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(count), GFP_KERNEL); |
1da177e4 LT |
2387 | if (!newpsl) { |
2388 | err = -ENOBUFS; | |
2389 | goto done; | |
2390 | } | |
2391 | newpsl->sl_max = count; | |
2392 | newpsl->sl_count = count - IP_SFBLOCK; | |
2393 | if (psl) { | |
c71151f0 | 2394 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2395 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e FL |
2396 | /* decrease mem now to avoid the memleak warning */ |
2397 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2398 | kfree_rcu(psl, rcu); |
1da177e4 | 2399 | } |
cf778b00 | 2400 | rcu_assign_pointer(pmc->sflist, newpsl); |
c85bb41e | 2401 | psl = newpsl; |
1da177e4 LT |
2402 | } |
2403 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2404 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2405 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2406 | sizeof(__be32)); |
1da177e4 LT |
2407 | if (rv == 0) |
2408 | break; | |
2409 | } | |
2410 | if (rv == 0) /* address already there is an error */ | |
2411 | goto done; | |
c71151f0 | 2412 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2413 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2414 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2415 | psl->sl_count++; | |
2416 | err = 0; | |
2417 | /* update the interface list */ | |
e905a9ed | 2418 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2419 | &mreqs->imr_sourceaddr, 1); |
2420 | done: | |
8cdaaa15 | 2421 | if (leavegroup) |
54ff9ef3 | 2422 | err = ip_mc_leave_group(sk, &imr); |
1da177e4 LT |
2423 | return err; |
2424 | } | |
2425 | ||
2426 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2427 | { | |
9951f036 | 2428 | int err = 0; |
1da177e4 | 2429 | struct ip_mreqn imr; |
63007727 | 2430 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2431 | struct ip_mc_socklist *pmc; |
2432 | struct in_device *in_dev; | |
2433 | struct inet_sock *inet = inet_sk(sk); | |
2434 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2435 | struct net *net = sock_net(sk); |
9951f036 | 2436 | int leavegroup = 0; |
1da177e4 | 2437 | |
f97c1e0c | 2438 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2439 | return -EINVAL; |
2440 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2441 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2442 | return -EINVAL; | |
2443 | ||
54ff9ef3 | 2444 | ASSERT_RTNL(); |
1da177e4 LT |
2445 | |
2446 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2447 | imr.imr_address.s_addr = msf->imsf_interface; | |
2448 | imr.imr_ifindex = ifindex; | |
877acedc | 2449 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2450 | |
2451 | if (!in_dev) { | |
2452 | err = -ENODEV; | |
2453 | goto done; | |
2454 | } | |
1da177e4 | 2455 | |
9951f036 DS |
2456 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2457 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2458 | leavegroup = 1; | |
2459 | goto done; | |
2460 | } | |
2461 | ||
1d7138de | 2462 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2463 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2464 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2465 | break; | |
2466 | } | |
917f2f10 DS |
2467 | if (!pmc) { /* must have a prior join */ |
2468 | err = -EINVAL; | |
1da177e4 | 2469 | goto done; |
917f2f10 | 2470 | } |
1da177e4 | 2471 | if (msf->imsf_numsrc) { |
8b3a7005 KK |
2472 | newpsl = sock_kmalloc(sk, IP_SFLSIZE(msf->imsf_numsrc), |
2473 | GFP_KERNEL); | |
1da177e4 LT |
2474 | if (!newpsl) { |
2475 | err = -ENOBUFS; | |
2476 | goto done; | |
2477 | } | |
2478 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2479 | memcpy(newpsl->sl_addr, msf->imsf_slist, | |
2480 | msf->imsf_numsrc * sizeof(msf->imsf_slist[0])); | |
2481 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, | |
2482 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2483 | if (err) { | |
2484 | sock_kfree_s(sk, newpsl, IP_SFLSIZE(newpsl->sl_max)); | |
2485 | goto done; | |
2486 | } | |
8713dbf0 | 2487 | } else { |
1da177e4 | 2488 | newpsl = NULL; |
8713dbf0 YZ |
2489 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2490 | msf->imsf_fmode, 0, NULL, 0); | |
2491 | } | |
1d7138de | 2492 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2493 | if (psl) { |
2494 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2495 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e FL |
2496 | /* decrease mem now to avoid the memleak warning */ |
2497 | atomic_sub(IP_SFLSIZE(psl->sl_max), &sk->sk_omem_alloc); | |
7519cce4 | 2498 | kfree_rcu(psl, rcu); |
1da177e4 LT |
2499 | } else |
2500 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2501 | 0, NULL, 0); | |
cf778b00 | 2502 | rcu_assign_pointer(pmc->sflist, newpsl); |
1da177e4 | 2503 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2504 | err = 0; |
1da177e4 | 2505 | done: |
9951f036 DS |
2506 | if (leavegroup) |
2507 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2508 | return err; |
2509 | } | |
2510 | ||
2511 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, | |
2512 | struct ip_msfilter __user *optval, int __user *optlen) | |
2513 | { | |
2514 | int err, len, count, copycount; | |
2515 | struct ip_mreqn imr; | |
63007727 | 2516 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2517 | struct ip_mc_socklist *pmc; |
2518 | struct in_device *in_dev; | |
2519 | struct inet_sock *inet = inet_sk(sk); | |
2520 | struct ip_sf_socklist *psl; | |
877acedc | 2521 | struct net *net = sock_net(sk); |
1da177e4 | 2522 | |
87e9f031 WC |
2523 | ASSERT_RTNL(); |
2524 | ||
f97c1e0c | 2525 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2526 | return -EINVAL; |
2527 | ||
1da177e4 LT |
2528 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
2529 | imr.imr_address.s_addr = msf->imsf_interface; | |
2530 | imr.imr_ifindex = 0; | |
877acedc | 2531 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2532 | |
2533 | if (!in_dev) { | |
2534 | err = -ENODEV; | |
2535 | goto done; | |
2536 | } | |
2537 | err = -EADDRNOTAVAIL; | |
2538 | ||
1d7138de | 2539 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2540 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2541 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2542 | break; | |
2543 | } | |
2544 | if (!pmc) /* must have a prior join */ | |
2545 | goto done; | |
2546 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2547 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2548 | if (!psl) { |
2549 | len = 0; | |
2550 | count = 0; | |
2551 | } else { | |
2552 | count = psl->sl_count; | |
2553 | } | |
2554 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2555 | len = copycount * sizeof(psl->sl_addr[0]); | |
2556 | msf->imsf_numsrc = count; | |
2557 | if (put_user(IP_MSFILTER_SIZE(copycount), optlen) || | |
2558 | copy_to_user(optval, msf, IP_MSFILTER_SIZE(0))) { | |
2559 | return -EFAULT; | |
2560 | } | |
2561 | if (len && | |
2562 | copy_to_user(&optval->imsf_slist[0], psl->sl_addr, len)) | |
2563 | return -EFAULT; | |
2564 | return 0; | |
2565 | done: | |
1da177e4 LT |
2566 | return err; |
2567 | } | |
2568 | ||
2569 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
2570 | struct group_filter __user *optval, int __user *optlen) | |
2571 | { | |
2572 | int err, i, count, copycount; | |
2573 | struct sockaddr_in *psin; | |
63007727 | 2574 | __be32 addr; |
1da177e4 LT |
2575 | struct ip_mc_socklist *pmc; |
2576 | struct inet_sock *inet = inet_sk(sk); | |
2577 | struct ip_sf_socklist *psl; | |
2578 | ||
87e9f031 WC |
2579 | ASSERT_RTNL(); |
2580 | ||
1da177e4 LT |
2581 | psin = (struct sockaddr_in *)&gsf->gf_group; |
2582 | if (psin->sin_family != AF_INET) | |
2583 | return -EINVAL; | |
2584 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2585 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2586 | return -EINVAL; |
2587 | ||
1da177e4 LT |
2588 | err = -EADDRNOTAVAIL; |
2589 | ||
1d7138de | 2590 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2591 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2592 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2593 | break; | |
2594 | } | |
2595 | if (!pmc) /* must have a prior join */ | |
2596 | goto done; | |
2597 | gsf->gf_fmode = pmc->sfmode; | |
1d7138de | 2598 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2599 | count = psl ? psl->sl_count : 0; |
2600 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2601 | gsf->gf_numsrc = count; | |
2602 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || | |
2603 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { | |
2604 | return -EFAULT; | |
2605 | } | |
c71151f0 | 2606 | for (i = 0; i < copycount; i++) { |
1da177e4 LT |
2607 | struct sockaddr_storage ss; |
2608 | ||
2609 | psin = (struct sockaddr_in *)&ss; | |
2610 | memset(&ss, 0, sizeof(ss)); | |
2611 | psin->sin_family = AF_INET; | |
2612 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
2613 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) | |
2614 | return -EFAULT; | |
2615 | } | |
2616 | return 0; | |
2617 | done: | |
1da177e4 LT |
2618 | return err; |
2619 | } | |
2620 | ||
2621 | /* | |
2622 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2623 | */ | |
60d9b031 DA |
2624 | int ip_mc_sf_allow(struct sock *sk, __be32 loc_addr, __be32 rmt_addr, |
2625 | int dif, int sdif) | |
1da177e4 LT |
2626 | { |
2627 | struct inet_sock *inet = inet_sk(sk); | |
2628 | struct ip_mc_socklist *pmc; | |
2629 | struct ip_sf_socklist *psl; | |
2630 | int i; | |
c85bb41e | 2631 | int ret; |
1da177e4 | 2632 | |
c85bb41e | 2633 | ret = 1; |
f97c1e0c | 2634 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2635 | goto out; |
1da177e4 | 2636 | |
c85bb41e | 2637 | rcu_read_lock(); |
1d7138de | 2638 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 | 2639 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
60d9b031 DA |
2640 | (pmc->multi.imr_ifindex == dif || |
2641 | (sdif && pmc->multi.imr_ifindex == sdif))) | |
1da177e4 LT |
2642 | break; |
2643 | } | |
c85bb41e | 2644 | ret = inet->mc_all; |
1da177e4 | 2645 | if (!pmc) |
c85bb41e | 2646 | goto unlock; |
1d7138de | 2647 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2648 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2649 | if (!psl) |
c85bb41e | 2650 | goto unlock; |
1da177e4 | 2651 | |
c71151f0 | 2652 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2653 | if (psl->sl_addr[i] == rmt_addr) |
2654 | break; | |
2655 | } | |
c85bb41e | 2656 | ret = 0; |
1da177e4 | 2657 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2658 | goto unlock; |
1da177e4 | 2659 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2660 | goto unlock; |
2661 | ret = 1; | |
2662 | unlock: | |
2663 | rcu_read_unlock(); | |
2664 | out: | |
2665 | return ret; | |
1da177e4 LT |
2666 | } |
2667 | ||
2668 | /* | |
2669 | * A socket is closing. | |
2670 | */ | |
2671 | ||
2672 | void ip_mc_drop_socket(struct sock *sk) | |
2673 | { | |
2674 | struct inet_sock *inet = inet_sk(sk); | |
2675 | struct ip_mc_socklist *iml; | |
877acedc | 2676 | struct net *net = sock_net(sk); |
1da177e4 | 2677 | |
51456b29 | 2678 | if (!inet->mc_list) |
1da177e4 LT |
2679 | return; |
2680 | ||
2681 | rtnl_lock(); | |
1d7138de | 2682 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2683 | struct in_device *in_dev; |
1da177e4 | 2684 | |
1d7138de | 2685 | inet->mc_list = iml->next_rcu; |
877acedc | 2686 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2687 | (void) ip_mc_leave_src(sk, iml, in_dev); |
00db4124 | 2688 | if (in_dev) |
1da177e4 | 2689 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2690 | /* decrease mem now to avoid the memleak warning */ |
2691 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2692 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2693 | } |
2694 | rtnl_unlock(); | |
2695 | } | |
2696 | ||
dbdd9a52 | 2697 | /* called with rcu_read_lock() */ |
2094acbb | 2698 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
1da177e4 LT |
2699 | { |
2700 | struct ip_mc_list *im; | |
e9897071 | 2701 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2702 | struct ip_sf_list *psf; |
2703 | int rv = 0; | |
2704 | ||
e9897071 ED |
2705 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2706 | if (mc_hash) { | |
c70eba74 | 2707 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2708 | |
2709 | for (im = rcu_dereference(mc_hash[hash]); | |
2710 | im != NULL; | |
2711 | im = rcu_dereference(im->next_hash)) { | |
2712 | if (im->multiaddr == mc_addr) | |
2713 | break; | |
2714 | } | |
2715 | } else { | |
2716 | for_each_pmc_rcu(in_dev, im) { | |
2717 | if (im->multiaddr == mc_addr) | |
2718 | break; | |
2719 | } | |
1da177e4 LT |
2720 | } |
2721 | if (im && proto == IPPROTO_IGMP) { | |
2722 | rv = 1; | |
2723 | } else if (im) { | |
2724 | if (src_addr) { | |
c71151f0 | 2725 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2726 | if (psf->sf_inaddr == src_addr) |
2727 | break; | |
2728 | } | |
2729 | if (psf) | |
2730 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2731 | psf->sf_count[MCAST_EXCLUDE] != | |
2732 | im->sfcount[MCAST_EXCLUDE]; | |
2733 | else | |
2734 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
2735 | } else | |
2736 | rv = 1; /* unspecified source; tentatively allow */ | |
2737 | } | |
1da177e4 LT |
2738 | return rv; |
2739 | } | |
2740 | ||
2741 | #if defined(CONFIG_PROC_FS) | |
2742 | struct igmp_mc_iter_state { | |
7091e728 | 2743 | struct seq_net_private p; |
1da177e4 LT |
2744 | struct net_device *dev; |
2745 | struct in_device *in_dev; | |
2746 | }; | |
2747 | ||
2748 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2749 | ||
2750 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2751 | { | |
7091e728 | 2752 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2753 | struct ip_mc_list *im = NULL; |
2754 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2755 | ||
7562f876 | 2756 | state->in_dev = NULL; |
61fbab77 | 2757 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2758 | struct in_device *in_dev; |
6baff150 ED |
2759 | |
2760 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2761 | if (!in_dev) |
2762 | continue; | |
1d7138de | 2763 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2764 | if (im) { |
2765 | state->in_dev = in_dev; | |
2766 | break; | |
2767 | } | |
1da177e4 LT |
2768 | } |
2769 | return im; | |
2770 | } | |
2771 | ||
2772 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2773 | { | |
2774 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2775 | |
1d7138de ED |
2776 | im = rcu_dereference(im->next_rcu); |
2777 | while (!im) { | |
6baff150 | 2778 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2779 | if (!state->dev) { |
2780 | state->in_dev = NULL; | |
2781 | break; | |
2782 | } | |
6baff150 | 2783 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2784 | if (!state->in_dev) |
2785 | continue; | |
1d7138de | 2786 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2787 | } |
2788 | return im; | |
2789 | } | |
2790 | ||
2791 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2792 | { | |
2793 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2794 | if (im) | |
2795 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2796 | --pos; | |
2797 | return pos ? NULL : im; | |
2798 | } | |
2799 | ||
2800 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2801 | __acquires(rcu) |
1da177e4 | 2802 | { |
61fbab77 | 2803 | rcu_read_lock(); |
1da177e4 LT |
2804 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2805 | } | |
2806 | ||
2807 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2808 | { | |
2809 | struct ip_mc_list *im; | |
2810 | if (v == SEQ_START_TOKEN) | |
2811 | im = igmp_mc_get_first(seq); | |
2812 | else | |
2813 | im = igmp_mc_get_next(seq, v); | |
2814 | ++*pos; | |
2815 | return im; | |
2816 | } | |
2817 | ||
2818 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2819 | __releases(rcu) |
1da177e4 LT |
2820 | { |
2821 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2822 | |
2823 | state->in_dev = NULL; | |
1da177e4 | 2824 | state->dev = NULL; |
61fbab77 | 2825 | rcu_read_unlock(); |
1da177e4 LT |
2826 | } |
2827 | ||
2828 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2829 | { | |
2830 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2831 | seq_puts(seq, |
1da177e4 LT |
2832 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2833 | else { | |
2834 | struct ip_mc_list *im = (struct ip_mc_list *)v; | |
2835 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2836 | char *querier; | |
a399a805 ED |
2837 | long delta; |
2838 | ||
1da177e4 LT |
2839 | #ifdef CONFIG_IP_MULTICAST |
2840 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2841 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2842 | "V3"; | |
2843 | #else | |
2844 | querier = "NONE"; | |
2845 | #endif | |
2846 | ||
e6b68883 | 2847 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2848 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2849 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2850 | } |
2851 | ||
a399a805 | 2852 | delta = im->timer.expires - jiffies; |
1da177e4 | 2853 | seq_printf(seq, |
338fcf98 | 2854 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2855 | im->multiaddr, im->users, |
a399a805 ED |
2856 | im->tm_running, |
2857 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2858 | im->reporter); |
2859 | } | |
2860 | return 0; | |
2861 | } | |
2862 | ||
f690808e | 2863 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2864 | .start = igmp_mc_seq_start, |
2865 | .next = igmp_mc_seq_next, | |
2866 | .stop = igmp_mc_seq_stop, | |
2867 | .show = igmp_mc_seq_show, | |
2868 | }; | |
2869 | ||
1da177e4 | 2870 | struct igmp_mcf_iter_state { |
7091e728 | 2871 | struct seq_net_private p; |
1da177e4 LT |
2872 | struct net_device *dev; |
2873 | struct in_device *idev; | |
2874 | struct ip_mc_list *im; | |
2875 | }; | |
2876 | ||
2877 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2878 | ||
2879 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2880 | { | |
7091e728 | 2881 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2882 | struct ip_sf_list *psf = NULL; |
2883 | struct ip_mc_list *im = NULL; | |
2884 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2885 | ||
7562f876 PE |
2886 | state->idev = NULL; |
2887 | state->im = NULL; | |
61fbab77 | 2888 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2889 | struct in_device *idev; |
6baff150 | 2890 | idev = __in_dev_get_rcu(state->dev); |
51456b29 | 2891 | if (unlikely(!idev)) |
1da177e4 | 2892 | continue; |
1d7138de | 2893 | im = rcu_dereference(idev->mc_list); |
00db4124 | 2894 | if (likely(im)) { |
1da177e4 LT |
2895 | spin_lock_bh(&im->lock); |
2896 | psf = im->sources; | |
00db4124 | 2897 | if (likely(psf)) { |
1da177e4 LT |
2898 | state->im = im; |
2899 | state->idev = idev; | |
2900 | break; | |
2901 | } | |
2902 | spin_unlock_bh(&im->lock); | |
2903 | } | |
1da177e4 LT |
2904 | } |
2905 | return psf; | |
2906 | } | |
2907 | ||
2908 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2909 | { | |
2910 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2911 | ||
2912 | psf = psf->sf_next; | |
2913 | while (!psf) { | |
2914 | spin_unlock_bh(&state->im->lock); | |
2915 | state->im = state->im->next; | |
2916 | while (!state->im) { | |
6baff150 | 2917 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2918 | if (!state->dev) { |
2919 | state->idev = NULL; | |
2920 | goto out; | |
2921 | } | |
6baff150 | 2922 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2923 | if (!state->idev) |
2924 | continue; | |
1d7138de | 2925 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 LT |
2926 | } |
2927 | if (!state->im) | |
2928 | break; | |
2929 | spin_lock_bh(&state->im->lock); | |
2930 | psf = state->im->sources; | |
2931 | } | |
2932 | out: | |
2933 | return psf; | |
2934 | } | |
2935 | ||
2936 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2937 | { | |
2938 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2939 | if (psf) | |
2940 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2941 | --pos; | |
2942 | return pos ? NULL : psf; | |
2943 | } | |
2944 | ||
2945 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2946 | __acquires(rcu) |
1da177e4 | 2947 | { |
61fbab77 | 2948 | rcu_read_lock(); |
1da177e4 LT |
2949 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2950 | } | |
2951 | ||
2952 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2953 | { | |
2954 | struct ip_sf_list *psf; | |
2955 | if (v == SEQ_START_TOKEN) | |
2956 | psf = igmp_mcf_get_first(seq); | |
2957 | else | |
2958 | psf = igmp_mcf_get_next(seq, v); | |
2959 | ++*pos; | |
2960 | return psf; | |
2961 | } | |
2962 | ||
2963 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2964 | __releases(rcu) |
1da177e4 LT |
2965 | { |
2966 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
00db4124 | 2967 | if (likely(state->im)) { |
1da177e4 LT |
2968 | spin_unlock_bh(&state->im->lock); |
2969 | state->im = NULL; | |
2970 | } | |
1d7138de | 2971 | state->idev = NULL; |
1da177e4 | 2972 | state->dev = NULL; |
61fbab77 | 2973 | rcu_read_unlock(); |
1da177e4 LT |
2974 | } |
2975 | ||
2976 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2977 | { | |
2978 | struct ip_sf_list *psf = (struct ip_sf_list *)v; | |
2979 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2980 | ||
2981 | if (v == SEQ_START_TOKEN) { | |
1744bea1 | 2982 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
1da177e4 LT |
2983 | } else { |
2984 | seq_printf(seq, | |
2985 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
2986 | "0x%08x %6lu %6lu\n", |
2987 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
2988 | ntohl(state->im->multiaddr), |
2989 | ntohl(psf->sf_inaddr), | |
2990 | psf->sf_count[MCAST_INCLUDE], | |
2991 | psf->sf_count[MCAST_EXCLUDE]); | |
2992 | } | |
2993 | return 0; | |
2994 | } | |
2995 | ||
f690808e | 2996 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
2997 | .start = igmp_mcf_seq_start, |
2998 | .next = igmp_mcf_seq_next, | |
2999 | .stop = igmp_mcf_seq_stop, | |
3000 | .show = igmp_mcf_seq_show, | |
3001 | }; | |
3002 | ||
2c8c1e72 | 3003 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 3004 | { |
7091e728 | 3005 | struct proc_dir_entry *pde; |
93a714d6 | 3006 | int err; |
7091e728 | 3007 | |
c3506372 CH |
3008 | pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops, |
3009 | sizeof(struct igmp_mc_iter_state)); | |
7091e728 AD |
3010 | if (!pde) |
3011 | goto out_igmp; | |
c3506372 CH |
3012 | pde = proc_create_net("mcfilter", 0444, net->proc_net, |
3013 | &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state)); | |
7091e728 AD |
3014 | if (!pde) |
3015 | goto out_mcfilter; | |
93a714d6 MC |
3016 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
3017 | SOCK_DGRAM, 0, net); | |
3018 | if (err < 0) { | |
3019 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
3020 | err); | |
3021 | goto out_sock; | |
3022 | } | |
3023 | ||
1da177e4 | 3024 | return 0; |
7091e728 | 3025 | |
93a714d6 MC |
3026 | out_sock: |
3027 | remove_proc_entry("mcfilter", net->proc_net); | |
7091e728 | 3028 | out_mcfilter: |
ece31ffd | 3029 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
3030 | out_igmp: |
3031 | return -ENOMEM; | |
3032 | } | |
3033 | ||
2c8c1e72 | 3034 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 3035 | { |
ece31ffd G |
3036 | remove_proc_entry("mcfilter", net->proc_net); |
3037 | remove_proc_entry("igmp", net->proc_net); | |
93a714d6 | 3038 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
7091e728 AD |
3039 | } |
3040 | ||
3041 | static struct pernet_operations igmp_net_ops = { | |
3042 | .init = igmp_net_init, | |
3043 | .exit = igmp_net_exit, | |
3044 | }; | |
72c1d3bd | 3045 | #endif |
7091e728 | 3046 | |
4aa5dee4 JP |
3047 | static int igmp_netdev_event(struct notifier_block *this, |
3048 | unsigned long event, void *ptr) | |
3049 | { | |
3050 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3051 | struct in_device *in_dev; | |
3052 | ||
3053 | switch (event) { | |
3054 | case NETDEV_RESEND_IGMP: | |
3055 | in_dev = __in_dev_get_rtnl(dev); | |
3056 | if (in_dev) | |
3057 | ip_mc_rejoin_groups(in_dev); | |
3058 | break; | |
3059 | default: | |
3060 | break; | |
3061 | } | |
3062 | return NOTIFY_DONE; | |
3063 | } | |
3064 | ||
3065 | static struct notifier_block igmp_notifier = { | |
3066 | .notifier_call = igmp_netdev_event, | |
3067 | }; | |
3068 | ||
72c1d3bd | 3069 | int __init igmp_mc_init(void) |
7091e728 | 3070 | { |
72c1d3bd | 3071 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
3072 | int err; |
3073 | ||
3074 | err = register_pernet_subsys(&igmp_net_ops); | |
3075 | if (err) | |
3076 | return err; | |
3077 | err = register_netdevice_notifier(&igmp_notifier); | |
3078 | if (err) | |
3079 | goto reg_notif_fail; | |
3080 | return 0; | |
3081 | ||
3082 | reg_notif_fail: | |
3083 | unregister_pernet_subsys(&igmp_net_ops); | |
3084 | return err; | |
72c1d3bd WC |
3085 | #else |
3086 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 3087 | #endif |
72c1d3bd | 3088 | } |