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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 | ||
966c37f2 | 110 | #define IGMP_QUERY_INTERVAL (125*HZ) |
436f7c20 | 111 | #define IGMP_QUERY_RESPONSE_INTERVAL (10*HZ) |
1da177e4 | 112 | |
436f7c20 | 113 | #define IGMP_INITIAL_REPORT_DELAY (1) |
1da177e4 | 114 | |
436f7c20 | 115 | /* IGMP_INITIAL_REPORT_DELAY is not from IGMP specs! |
1da177e4 LT |
116 | * IGMP specs require to report membership immediately after |
117 | * joining a group, but we delay the first report by a | |
118 | * small interval. It seems more natural and still does not | |
119 | * contradict to specs provided this delay is small enough. | |
120 | */ | |
121 | ||
42f811b8 | 122 | #define IGMP_V1_SEEN(in_dev) \ |
0598f8f3 | 123 | (IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 1 || \ |
42f811b8 HX |
124 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 1 || \ |
125 | ((in_dev)->mr_v1_seen && \ | |
126 | time_before(jiffies, (in_dev)->mr_v1_seen))) | |
127 | #define IGMP_V2_SEEN(in_dev) \ | |
0598f8f3 | 128 | (IPV4_DEVCONF_ALL_RO(dev_net(in_dev->dev), FORCE_IGMP_VERSION) == 2 || \ |
42f811b8 HX |
129 | IN_DEV_CONF_GET((in_dev), FORCE_IGMP_VERSION) == 2 || \ |
130 | ((in_dev)->mr_v2_seen && \ | |
131 | time_before(jiffies, (in_dev)->mr_v2_seen))) | |
1da177e4 | 132 | |
cab70040 WM |
133 | static int unsolicited_report_interval(struct in_device *in_dev) |
134 | { | |
2690048c WM |
135 | int interval_ms, interval_jiffies; |
136 | ||
cab70040 | 137 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
2690048c WM |
138 | interval_ms = IN_DEV_CONF_GET( |
139 | in_dev, | |
140 | IGMPV2_UNSOLICITED_REPORT_INTERVAL); | |
cab70040 | 141 | else /* v3 */ |
2690048c WM |
142 | interval_ms = IN_DEV_CONF_GET( |
143 | in_dev, | |
144 | IGMPV3_UNSOLICITED_REPORT_INTERVAL); | |
145 | ||
146 | interval_jiffies = msecs_to_jiffies(interval_ms); | |
147 | ||
148 | /* _timer functions can't handle a delay of 0 jiffies so ensure | |
149 | * we always return a positive value. | |
150 | */ | |
151 | if (interval_jiffies <= 0) | |
152 | interval_jiffies = 1; | |
153 | return interval_jiffies; | |
cab70040 WM |
154 | } |
155 | ||
9fb20801 FF |
156 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, |
157 | gfp_t gfp); | |
24803f38 | 158 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im); |
1da177e4 LT |
159 | static void igmpv3_clear_delrec(struct in_device *in_dev); |
160 | static int sf_setstate(struct ip_mc_list *pmc); | |
161 | static void sf_markstate(struct ip_mc_list *pmc); | |
162 | #endif | |
163 | static void ip_mc_clear_src(struct ip_mc_list *pmc); | |
8f935bbd AV |
164 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
165 | int sfcount, __be32 *psfsrc, int delta); | |
1da177e4 LT |
166 | |
167 | static void ip_ma_put(struct ip_mc_list *im) | |
168 | { | |
8851ab52 | 169 | if (refcount_dec_and_test(&im->refcnt)) { |
1da177e4 | 170 | in_dev_put(im->interface); |
42ea299d | 171 | kfree_rcu(im, rcu); |
1da177e4 LT |
172 | } |
173 | } | |
174 | ||
d9aa9380 DM |
175 | #define for_each_pmc_rcu(in_dev, pmc) \ |
176 | for (pmc = rcu_dereference(in_dev->mc_list); \ | |
177 | pmc != NULL; \ | |
178 | pmc = rcu_dereference(pmc->next_rcu)) | |
179 | ||
180 | #define for_each_pmc_rtnl(in_dev, pmc) \ | |
181 | for (pmc = rtnl_dereference(in_dev->mc_list); \ | |
182 | pmc != NULL; \ | |
183 | pmc = rtnl_dereference(pmc->next_rcu)) | |
184 | ||
903869bd ED |
185 | static void ip_sf_list_clear_all(struct ip_sf_list *psf) |
186 | { | |
187 | struct ip_sf_list *next; | |
188 | ||
189 | while (psf) { | |
190 | next = psf->sf_next; | |
191 | kfree(psf); | |
192 | psf = next; | |
193 | } | |
194 | } | |
195 | ||
1da177e4 LT |
196 | #ifdef CONFIG_IP_MULTICAST |
197 | ||
198 | /* | |
199 | * Timer management | |
200 | */ | |
201 | ||
1d7138de | 202 | static void igmp_stop_timer(struct ip_mc_list *im) |
1da177e4 LT |
203 | { |
204 | spin_lock_bh(&im->lock); | |
205 | if (del_timer(&im->timer)) | |
8851ab52 | 206 | refcount_dec(&im->refcnt); |
a7e9ff73 | 207 | im->tm_running = 0; |
1da177e4 LT |
208 | im->reporter = 0; |
209 | im->unsolicit_count = 0; | |
210 | spin_unlock_bh(&im->lock); | |
211 | } | |
212 | ||
213 | /* It must be called with locked im->lock */ | |
214 | static void igmp_start_timer(struct ip_mc_list *im, int max_delay) | |
215 | { | |
8032bf12 | 216 | int tv = get_random_u32_below(max_delay); |
1da177e4 | 217 | |
a7e9ff73 | 218 | im->tm_running = 1; |
e2b706c6 ZS |
219 | if (refcount_inc_not_zero(&im->refcnt)) { |
220 | if (mod_timer(&im->timer, jiffies + tv + 2)) | |
221 | ip_ma_put(im); | |
222 | } | |
1da177e4 LT |
223 | } |
224 | ||
225 | static void igmp_gq_start_timer(struct in_device *in_dev) | |
226 | { | |
8032bf12 | 227 | int tv = get_random_u32_below(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 | { | |
8032bf12 | 241 | int tv = get_random_u32_below(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; | |
c3b704d4 | 358 | unsigned int size; |
1da177e4 | 359 | |
c3b704d4 | 360 | size = min(mtu, IP_MAX_MTU); |
57e1ab6e | 361 | while (1) { |
66088243 | 362 | skb = alloc_skb(size + hlen + tlen, |
57e1ab6e ED |
363 | GFP_ATOMIC | __GFP_NOWARN); |
364 | if (skb) | |
365 | break; | |
366 | size >>= 1; | |
367 | if (size < 256) | |
368 | return NULL; | |
369 | } | |
9d4a0314 | 370 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 371 | |
31e4543d | 372 | rt = ip_route_output_ports(net, &fl4, NULL, IGMPV3_ALL_MCR, 0, |
78fbfd8a DM |
373 | 0, 0, |
374 | IPPROTO_IGMP, 0, dev->ifindex); | |
375 | if (IS_ERR(rt)) { | |
376 | kfree_skb(skb); | |
377 | return NULL; | |
1da177e4 | 378 | } |
1da177e4 | 379 | |
d8d1f30b | 380 | skb_dst_set(skb, &rt->dst); |
1da177e4 LT |
381 | skb->dev = dev; |
382 | ||
66088243 | 383 | skb_reserve(skb, hlen); |
1837b2e2 | 384 | skb_tailroom_reserve(skb, mtu, tlen); |
1da177e4 | 385 | |
7e28ecc2 | 386 | skb_reset_network_header(skb); |
eddc9ec5 | 387 | pip = ip_hdr(skb); |
7e28ecc2 | 388 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
389 | |
390 | pip->version = 4; | |
391 | pip->ihl = (sizeof(struct iphdr)+4)>>2; | |
392 | pip->tos = 0xc0; | |
393 | pip->frag_off = htons(IP_DF); | |
394 | pip->ttl = 1; | |
492f64ce | 395 | pip->daddr = fl4.daddr; |
e7aadb27 ED |
396 | |
397 | rcu_read_lock(); | |
a46182b0 | 398 | pip->saddr = igmpv3_get_srcaddr(dev, &fl4); |
e7aadb27 ED |
399 | rcu_read_unlock(); |
400 | ||
1da177e4 LT |
401 | pip->protocol = IPPROTO_IGMP; |
402 | pip->tot_len = 0; /* filled in later */ | |
b6a7719a | 403 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
404 | ((u8 *)&pip[1])[0] = IPOPT_RA; |
405 | ((u8 *)&pip[1])[1] = 4; | |
406 | ((u8 *)&pip[1])[2] = 0; | |
407 | ((u8 *)&pip[1])[3] = 0; | |
1da177e4 | 408 | |
b0e380b1 | 409 | skb->transport_header = skb->network_header + sizeof(struct iphdr) + 4; |
d10ba34b | 410 | skb_put(skb, sizeof(*pig)); |
d9edf9e2 | 411 | pig = igmpv3_report_hdr(skb); |
1da177e4 LT |
412 | pig->type = IGMPV3_HOST_MEMBERSHIP_REPORT; |
413 | pig->resv1 = 0; | |
414 | pig->csum = 0; | |
415 | pig->resv2 = 0; | |
416 | pig->ngrec = 0; | |
417 | return skb; | |
418 | } | |
419 | ||
420 | static int igmpv3_sendpack(struct sk_buff *skb) | |
421 | { | |
d9edf9e2 | 422 | struct igmphdr *pig = igmp_hdr(skb); |
f7c0c2ae | 423 | const int igmplen = skb_tail_pointer(skb) - skb_transport_header(skb); |
1da177e4 | 424 | |
d9edf9e2 | 425 | pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen); |
1da177e4 | 426 | |
33224b16 | 427 | return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
1da177e4 LT |
428 | } |
429 | ||
430 | static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel) | |
431 | { | |
a7e9ff73 | 432 | return sizeof(struct igmpv3_grec) + 4*igmp_scount(pmc, type, gdel, sdel); |
1da177e4 LT |
433 | } |
434 | ||
435 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ip_mc_list *pmc, | |
b5476022 | 436 | int type, struct igmpv3_grec **ppgr, unsigned int mtu) |
1da177e4 LT |
437 | { |
438 | struct net_device *dev = pmc->interface->dev; | |
439 | struct igmpv3_report *pih; | |
440 | struct igmpv3_grec *pgr; | |
441 | ||
b5476022 ED |
442 | if (!skb) { |
443 | skb = igmpv3_newpack(dev, mtu); | |
444 | if (!skb) | |
445 | return NULL; | |
446 | } | |
4df864c1 | 447 | pgr = skb_put(skb, sizeof(struct igmpv3_grec)); |
1da177e4 LT |
448 | pgr->grec_type = type; |
449 | pgr->grec_auxwords = 0; | |
450 | pgr->grec_nsrcs = 0; | |
451 | pgr->grec_mca = pmc->multiaddr; | |
d9edf9e2 | 452 | pih = igmpv3_report_hdr(skb); |
1da177e4 LT |
453 | pih->ngrec = htons(ntohs(pih->ngrec)+1); |
454 | *ppgr = pgr; | |
455 | return skb; | |
456 | } | |
457 | ||
4c672e4b | 458 | #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
1da177e4 LT |
459 | |
460 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc, | |
461 | int type, int gdeleted, int sdeleted) | |
462 | { | |
463 | struct net_device *dev = pmc->interface->dev; | |
87a8a2ae | 464 | struct net *net = dev_net(dev); |
1da177e4 LT |
465 | struct igmpv3_report *pih; |
466 | struct igmpv3_grec *pgr = NULL; | |
467 | struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list; | |
ad12583f | 468 | int scount, stotal, first, isquery, truncate; |
b5476022 | 469 | unsigned int mtu; |
1da177e4 LT |
470 | |
471 | if (pmc->multiaddr == IGMP_ALL_HOSTS) | |
472 | return skb; | |
f6da2267 KI |
473 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
474 | !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports)) | |
df2cf4a7 | 475 | return skb; |
1da177e4 | 476 | |
b5476022 ED |
477 | mtu = READ_ONCE(dev->mtu); |
478 | if (mtu < IPV4_MIN_MTU) | |
479 | return skb; | |
480 | ||
1da177e4 LT |
481 | isquery = type == IGMPV3_MODE_IS_INCLUDE || |
482 | type == IGMPV3_MODE_IS_EXCLUDE; | |
483 | truncate = type == IGMPV3_MODE_IS_EXCLUDE || | |
484 | type == IGMPV3_CHANGE_TO_EXCLUDE; | |
485 | ||
ad12583f DS |
486 | stotal = scount = 0; |
487 | ||
1da177e4 LT |
488 | psf_list = sdeleted ? &pmc->tomb : &pmc->sources; |
489 | ||
ad12583f DS |
490 | if (!*psf_list) |
491 | goto empty_source; | |
492 | ||
d9edf9e2 | 493 | pih = skb ? igmpv3_report_hdr(skb) : NULL; |
1da177e4 LT |
494 | |
495 | /* EX and TO_EX get a fresh packet, if needed */ | |
496 | if (truncate) { | |
497 | if (pih && pih->ngrec && | |
498 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { | |
499 | if (skb) | |
500 | igmpv3_sendpack(skb); | |
b5476022 | 501 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
502 | } |
503 | } | |
504 | first = 1; | |
1da177e4 | 505 | psf_prev = NULL; |
c71151f0 | 506 | for (psf = *psf_list; psf; psf = psf_next) { |
ea4d9e72 | 507 | __be32 *psrc; |
1da177e4 LT |
508 | |
509 | psf_next = psf->sf_next; | |
510 | ||
511 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { | |
512 | psf_prev = psf; | |
513 | continue; | |
514 | } | |
515 | ||
a052517a HL |
516 | /* Based on RFC3376 5.1. Should not send source-list change |
517 | * records when there is a filter mode change. | |
518 | */ | |
519 | if (((gdeleted && pmc->sfmode == MCAST_EXCLUDE) || | |
520 | (!gdeleted && pmc->crcount)) && | |
521 | (type == IGMPV3_ALLOW_NEW_SOURCES || | |
522 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) | |
523 | goto decrease_sf_crcount; | |
524 | ||
1da177e4 LT |
525 | /* clear marks on query responses */ |
526 | if (isquery) | |
527 | psf->sf_gsresp = 0; | |
528 | ||
63007727 | 529 | if (AVAILABLE(skb) < sizeof(__be32) + |
1da177e4 LT |
530 | first*sizeof(struct igmpv3_grec)) { |
531 | if (truncate && !first) | |
532 | break; /* truncate these */ | |
533 | if (pgr) | |
534 | pgr->grec_nsrcs = htons(scount); | |
535 | if (skb) | |
536 | igmpv3_sendpack(skb); | |
b5476022 | 537 | skb = igmpv3_newpack(dev, mtu); |
1da177e4 LT |
538 | first = 1; |
539 | scount = 0; | |
540 | } | |
541 | if (first) { | |
b5476022 | 542 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
1da177e4 LT |
543 | first = 0; |
544 | } | |
cc63f70b AD |
545 | if (!skb) |
546 | return NULL; | |
4df864c1 | 547 | psrc = skb_put(skb, sizeof(__be32)); |
1da177e4 | 548 | *psrc = psf->sf_inaddr; |
ad12583f | 549 | scount++; stotal++; |
1da177e4 LT |
550 | if ((type == IGMPV3_ALLOW_NEW_SOURCES || |
551 | type == IGMPV3_BLOCK_OLD_SOURCES) && psf->sf_crcount) { | |
a052517a | 552 | decrease_sf_crcount: |
1da177e4 LT |
553 | psf->sf_crcount--; |
554 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { | |
555 | if (psf_prev) | |
556 | psf_prev->sf_next = psf->sf_next; | |
557 | else | |
558 | *psf_list = psf->sf_next; | |
559 | kfree(psf); | |
560 | continue; | |
561 | } | |
562 | } | |
563 | psf_prev = psf; | |
564 | } | |
ad12583f DS |
565 | |
566 | empty_source: | |
567 | if (!stotal) { | |
568 | if (type == IGMPV3_ALLOW_NEW_SOURCES || | |
569 | type == IGMPV3_BLOCK_OLD_SOURCES) | |
570 | return skb; | |
571 | if (pmc->crcount || isquery) { | |
572 | /* make sure we have room for group header */ | |
c71151f0 | 573 | if (skb && AVAILABLE(skb) < sizeof(struct igmpv3_grec)) { |
ad12583f DS |
574 | igmpv3_sendpack(skb); |
575 | skb = NULL; /* add_grhead will get a new one */ | |
576 | } | |
b5476022 | 577 | skb = add_grhead(skb, pmc, type, &pgr, mtu); |
ad12583f DS |
578 | } |
579 | } | |
1da177e4 LT |
580 | if (pgr) |
581 | pgr->grec_nsrcs = htons(scount); | |
582 | ||
583 | if (isquery) | |
584 | pmc->gsquery = 0; /* clear query state on report */ | |
585 | return skb; | |
586 | } | |
587 | ||
588 | static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc) | |
589 | { | |
590 | struct sk_buff *skb = NULL; | |
87a8a2ae | 591 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
592 | int type; |
593 | ||
594 | if (!pmc) { | |
1d7138de ED |
595 | rcu_read_lock(); |
596 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
597 | if (pmc->multiaddr == IGMP_ALL_HOSTS) |
598 | continue; | |
df2cf4a7 | 599 | if (ipv4_is_local_multicast(pmc->multiaddr) && |
f6da2267 | 600 | !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports)) |
df2cf4a7 | 601 | continue; |
1da177e4 LT |
602 | spin_lock_bh(&pmc->lock); |
603 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
604 | type = IGMPV3_MODE_IS_EXCLUDE; | |
605 | else | |
606 | type = IGMPV3_MODE_IS_INCLUDE; | |
607 | skb = add_grec(skb, pmc, type, 0, 0); | |
608 | spin_unlock_bh(&pmc->lock); | |
609 | } | |
1d7138de | 610 | rcu_read_unlock(); |
1da177e4 LT |
611 | } else { |
612 | spin_lock_bh(&pmc->lock); | |
613 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
614 | type = IGMPV3_MODE_IS_EXCLUDE; | |
615 | else | |
616 | type = IGMPV3_MODE_IS_INCLUDE; | |
617 | skb = add_grec(skb, pmc, type, 0, 0); | |
618 | spin_unlock_bh(&pmc->lock); | |
619 | } | |
620 | if (!skb) | |
621 | return 0; | |
622 | return igmpv3_sendpack(skb); | |
623 | } | |
624 | ||
625 | /* | |
626 | * remove zero-count source records from a source filter list | |
627 | */ | |
628 | static void igmpv3_clear_zeros(struct ip_sf_list **ppsf) | |
629 | { | |
630 | struct ip_sf_list *psf_prev, *psf_next, *psf; | |
631 | ||
632 | psf_prev = NULL; | |
c71151f0 | 633 | for (psf = *ppsf; psf; psf = psf_next) { |
1da177e4 LT |
634 | psf_next = psf->sf_next; |
635 | if (psf->sf_crcount == 0) { | |
636 | if (psf_prev) | |
637 | psf_prev->sf_next = psf->sf_next; | |
638 | else | |
639 | *ppsf = psf->sf_next; | |
640 | kfree(psf); | |
641 | } else | |
642 | psf_prev = psf; | |
643 | } | |
644 | } | |
645 | ||
3580d04a ED |
646 | static void kfree_pmc(struct ip_mc_list *pmc) |
647 | { | |
648 | ip_sf_list_clear_all(pmc->sources); | |
649 | ip_sf_list_clear_all(pmc->tomb); | |
650 | kfree(pmc); | |
651 | } | |
652 | ||
1da177e4 LT |
653 | static void igmpv3_send_cr(struct in_device *in_dev) |
654 | { | |
655 | struct ip_mc_list *pmc, *pmc_prev, *pmc_next; | |
656 | struct sk_buff *skb = NULL; | |
657 | int type, dtype; | |
658 | ||
1d7138de | 659 | rcu_read_lock(); |
1da177e4 LT |
660 | spin_lock_bh(&in_dev->mc_tomb_lock); |
661 | ||
662 | /* deleted MCA's */ | |
663 | pmc_prev = NULL; | |
c71151f0 | 664 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc_next) { |
1da177e4 LT |
665 | pmc_next = pmc->next; |
666 | if (pmc->sfmode == MCAST_INCLUDE) { | |
667 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
668 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
669 | skb = add_grec(skb, pmc, type, 1, 0); | |
670 | skb = add_grec(skb, pmc, dtype, 1, 1); | |
671 | } | |
672 | if (pmc->crcount) { | |
1da177e4 LT |
673 | if (pmc->sfmode == MCAST_EXCLUDE) { |
674 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
675 | skb = add_grec(skb, pmc, type, 1, 0); | |
676 | } | |
ad12583f | 677 | pmc->crcount--; |
1da177e4 LT |
678 | if (pmc->crcount == 0) { |
679 | igmpv3_clear_zeros(&pmc->tomb); | |
680 | igmpv3_clear_zeros(&pmc->sources); | |
681 | } | |
682 | } | |
683 | if (pmc->crcount == 0 && !pmc->tomb && !pmc->sources) { | |
684 | if (pmc_prev) | |
685 | pmc_prev->next = pmc_next; | |
686 | else | |
687 | in_dev->mc_tomb = pmc_next; | |
688 | in_dev_put(pmc->interface); | |
3580d04a | 689 | kfree_pmc(pmc); |
1da177e4 LT |
690 | } else |
691 | pmc_prev = pmc; | |
692 | } | |
693 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
694 | ||
695 | /* change recs */ | |
1d7138de | 696 | for_each_pmc_rcu(in_dev, pmc) { |
1da177e4 LT |
697 | spin_lock_bh(&pmc->lock); |
698 | if (pmc->sfcount[MCAST_EXCLUDE]) { | |
699 | type = IGMPV3_BLOCK_OLD_SOURCES; | |
700 | dtype = IGMPV3_ALLOW_NEW_SOURCES; | |
701 | } else { | |
702 | type = IGMPV3_ALLOW_NEW_SOURCES; | |
703 | dtype = IGMPV3_BLOCK_OLD_SOURCES; | |
704 | } | |
705 | skb = add_grec(skb, pmc, type, 0, 0); | |
706 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ | |
707 | ||
708 | /* filter mode changes */ | |
709 | if (pmc->crcount) { | |
1da177e4 LT |
710 | if (pmc->sfmode == MCAST_EXCLUDE) |
711 | type = IGMPV3_CHANGE_TO_EXCLUDE; | |
712 | else | |
713 | type = IGMPV3_CHANGE_TO_INCLUDE; | |
714 | skb = add_grec(skb, pmc, type, 0, 0); | |
ad12583f | 715 | pmc->crcount--; |
1da177e4 LT |
716 | } |
717 | spin_unlock_bh(&pmc->lock); | |
718 | } | |
1d7138de | 719 | rcu_read_unlock(); |
1da177e4 LT |
720 | |
721 | if (!skb) | |
722 | return; | |
723 | (void) igmpv3_sendpack(skb); | |
724 | } | |
725 | ||
726 | static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc, | |
727 | int type) | |
728 | { | |
729 | struct sk_buff *skb; | |
730 | struct iphdr *iph; | |
731 | struct igmphdr *ih; | |
732 | struct rtable *rt; | |
733 | struct net_device *dev = in_dev->dev; | |
877acedc | 734 | struct net *net = dev_net(dev); |
63007727 | 735 | __be32 group = pmc ? pmc->multiaddr : 0; |
31e4543d | 736 | struct flowi4 fl4; |
63007727 | 737 | __be32 dst; |
66088243 | 738 | int hlen, tlen; |
1da177e4 LT |
739 | |
740 | if (type == IGMPV3_HOST_MEMBERSHIP_REPORT) | |
741 | return igmpv3_send_report(in_dev, pmc); | |
df2cf4a7 | 742 | |
f6da2267 KI |
743 | if (ipv4_is_local_multicast(group) && |
744 | !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports)) | |
df2cf4a7 PD |
745 | return 0; |
746 | ||
747 | if (type == IGMP_HOST_LEAVE_MESSAGE) | |
1da177e4 LT |
748 | dst = IGMP_ALL_ROUTER; |
749 | else | |
750 | dst = group; | |
751 | ||
31e4543d | 752 | rt = ip_route_output_ports(net, &fl4, NULL, dst, 0, |
78fbfd8a DM |
753 | 0, 0, |
754 | IPPROTO_IGMP, 0, dev->ifindex); | |
755 | if (IS_ERR(rt)) | |
756 | return -1; | |
757 | ||
66088243 HX |
758 | hlen = LL_RESERVED_SPACE(dev); |
759 | tlen = dev->needed_tailroom; | |
760 | skb = alloc_skb(IGMP_SIZE + hlen + tlen, GFP_ATOMIC); | |
51456b29 | 761 | if (!skb) { |
1da177e4 LT |
762 | ip_rt_put(rt); |
763 | return -1; | |
764 | } | |
9d4a0314 | 765 | skb->priority = TC_PRIO_CONTROL; |
1da177e4 | 766 | |
d8d1f30b | 767 | skb_dst_set(skb, &rt->dst); |
1da177e4 | 768 | |
66088243 | 769 | skb_reserve(skb, hlen); |
1da177e4 | 770 | |
7e28ecc2 | 771 | skb_reset_network_header(skb); |
eddc9ec5 | 772 | iph = ip_hdr(skb); |
7e28ecc2 | 773 | skb_put(skb, sizeof(struct iphdr) + 4); |
1da177e4 LT |
774 | |
775 | iph->version = 4; | |
776 | iph->ihl = (sizeof(struct iphdr)+4)>>2; | |
777 | iph->tos = 0xc0; | |
778 | iph->frag_off = htons(IP_DF); | |
779 | iph->ttl = 1; | |
780 | iph->daddr = dst; | |
492f64ce | 781 | iph->saddr = fl4.saddr; |
1da177e4 | 782 | iph->protocol = IPPROTO_IGMP; |
b6a7719a | 783 | ip_select_ident(net, skb, NULL); |
5e73ea1a DB |
784 | ((u8 *)&iph[1])[0] = IPOPT_RA; |
785 | ((u8 *)&iph[1])[1] = 4; | |
786 | ((u8 *)&iph[1])[2] = 0; | |
787 | ((u8 *)&iph[1])[3] = 0; | |
1da177e4 | 788 | |
4df864c1 | 789 | ih = skb_put(skb, sizeof(struct igmphdr)); |
a7e9ff73 JK |
790 | ih->type = type; |
791 | ih->code = 0; | |
792 | ih->csum = 0; | |
793 | ih->group = group; | |
794 | ih->csum = ip_compute_csum((void *)ih, sizeof(struct igmphdr)); | |
1da177e4 | 795 | |
33224b16 | 796 | return ip_local_out(net, skb->sk, skb); |
1da177e4 LT |
797 | } |
798 | ||
e99e88a9 | 799 | static void igmp_gq_timer_expire(struct timer_list *t) |
1da177e4 | 800 | { |
e99e88a9 | 801 | struct in_device *in_dev = from_timer(in_dev, t, mr_gq_timer); |
1da177e4 LT |
802 | |
803 | in_dev->mr_gq_running = 0; | |
804 | igmpv3_send_report(in_dev, NULL); | |
e2401654 | 805 | in_dev_put(in_dev); |
1da177e4 LT |
806 | } |
807 | ||
e99e88a9 | 808 | static void igmp_ifc_timer_expire(struct timer_list *t) |
1da177e4 | 809 | { |
e99e88a9 | 810 | struct in_device *in_dev = from_timer(in_dev, t, mr_ifc_timer); |
b69dd5b3 | 811 | u32 mr_ifc_count; |
1da177e4 LT |
812 | |
813 | igmpv3_send_cr(in_dev); | |
4a2b285e ED |
814 | restart: |
815 | mr_ifc_count = READ_ONCE(in_dev->mr_ifc_count); | |
816 | ||
817 | if (mr_ifc_count) { | |
818 | if (cmpxchg(&in_dev->mr_ifc_count, | |
819 | mr_ifc_count, | |
820 | mr_ifc_count - 1) != mr_ifc_count) | |
821 | goto restart; | |
cab70040 WM |
822 | igmp_ifc_start_timer(in_dev, |
823 | unsolicited_report_interval(in_dev)); | |
1da177e4 | 824 | } |
e2401654 | 825 | in_dev_put(in_dev); |
1da177e4 LT |
826 | } |
827 | ||
828 | static void igmp_ifc_event(struct in_device *in_dev) | |
829 | { | |
165094af | 830 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
831 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) |
832 | return; | |
8ebcc62c | 833 | WRITE_ONCE(in_dev->mr_ifc_count, in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv)); |
1da177e4 LT |
834 | igmp_ifc_start_timer(in_dev, 1); |
835 | } | |
836 | ||
837 | ||
e99e88a9 | 838 | static void igmp_timer_expire(struct timer_list *t) |
1da177e4 | 839 | { |
e99e88a9 | 840 | struct ip_mc_list *im = from_timer(im, t, timer); |
1da177e4 LT |
841 | struct in_device *in_dev = im->interface; |
842 | ||
843 | spin_lock(&im->lock); | |
a7e9ff73 | 844 | im->tm_running = 0; |
1da177e4 | 845 | |
4fb7253e | 846 | if (im->unsolicit_count && --im->unsolicit_count) |
cab70040 | 847 | igmp_start_timer(im, unsolicited_report_interval(in_dev)); |
4fb7253e | 848 | |
1da177e4 LT |
849 | im->reporter = 1; |
850 | spin_unlock(&im->lock); | |
851 | ||
852 | if (IGMP_V1_SEEN(in_dev)) | |
853 | igmp_send_report(in_dev, im, IGMP_HOST_MEMBERSHIP_REPORT); | |
854 | else if (IGMP_V2_SEEN(in_dev)) | |
855 | igmp_send_report(in_dev, im, IGMPV2_HOST_MEMBERSHIP_REPORT); | |
856 | else | |
857 | igmp_send_report(in_dev, im, IGMPV3_HOST_MEMBERSHIP_REPORT); | |
858 | ||
859 | ip_ma_put(im); | |
860 | } | |
861 | ||
ad12583f | 862 | /* mark EXCLUDE-mode sources */ |
ea4d9e72 | 863 | static int igmp_xmarksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
1da177e4 LT |
864 | { |
865 | struct ip_sf_list *psf; | |
866 | int i, scount; | |
867 | ||
ad12583f | 868 | scount = 0; |
c71151f0 | 869 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
ad12583f DS |
870 | if (scount == nsrcs) |
871 | break; | |
c71151f0 | 872 | for (i = 0; i < nsrcs; i++) { |
ad12583f | 873 | /* skip inactive filters */ |
e05c4ad3 | 874 | if (psf->sf_count[MCAST_INCLUDE] || |
ad12583f DS |
875 | pmc->sfcount[MCAST_EXCLUDE] != |
876 | psf->sf_count[MCAST_EXCLUDE]) | |
ce713ee5 | 877 | break; |
ad12583f DS |
878 | if (srcs[i] == psf->sf_inaddr) { |
879 | scount++; | |
880 | break; | |
881 | } | |
882 | } | |
883 | } | |
884 | pmc->gsquery = 0; | |
885 | if (scount == nsrcs) /* all sources excluded */ | |
886 | return 0; | |
887 | return 1; | |
888 | } | |
889 | ||
ea4d9e72 | 890 | static int igmp_marksources(struct ip_mc_list *pmc, int nsrcs, __be32 *srcs) |
ad12583f DS |
891 | { |
892 | struct ip_sf_list *psf; | |
893 | int i, scount; | |
894 | ||
895 | if (pmc->sfmode == MCAST_EXCLUDE) | |
896 | return igmp_xmarksources(pmc, nsrcs, srcs); | |
897 | ||
898 | /* mark INCLUDE-mode sources */ | |
1da177e4 | 899 | scount = 0; |
c71151f0 | 900 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
901 | if (scount == nsrcs) |
902 | break; | |
c71151f0 | 903 | for (i = 0; i < nsrcs; i++) |
1da177e4 LT |
904 | if (srcs[i] == psf->sf_inaddr) { |
905 | psf->sf_gsresp = 1; | |
906 | scount++; | |
907 | break; | |
908 | } | |
909 | } | |
ad12583f DS |
910 | if (!scount) { |
911 | pmc->gsquery = 0; | |
912 | return 0; | |
913 | } | |
914 | pmc->gsquery = 1; | |
915 | return 1; | |
1da177e4 LT |
916 | } |
917 | ||
d679c532 ED |
918 | /* return true if packet was dropped */ |
919 | static bool igmp_heard_report(struct in_device *in_dev, __be32 group) | |
1da177e4 LT |
920 | { |
921 | struct ip_mc_list *im; | |
87a8a2ae | 922 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
923 | |
924 | /* Timers are only set for non-local groups */ | |
925 | ||
926 | if (group == IGMP_ALL_HOSTS) | |
d679c532 | 927 | return false; |
f6da2267 KI |
928 | if (ipv4_is_local_multicast(group) && |
929 | !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports)) | |
df2cf4a7 | 930 | return false; |
1da177e4 | 931 | |
1d7138de ED |
932 | rcu_read_lock(); |
933 | for_each_pmc_rcu(in_dev, im) { | |
1da177e4 LT |
934 | if (im->multiaddr == group) { |
935 | igmp_stop_timer(im); | |
936 | break; | |
937 | } | |
938 | } | |
1d7138de | 939 | rcu_read_unlock(); |
d679c532 | 940 | return false; |
1da177e4 LT |
941 | } |
942 | ||
d679c532 ED |
943 | /* return true if packet was dropped */ |
944 | static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb, | |
1da177e4 LT |
945 | int len) |
946 | { | |
d9edf9e2 ACM |
947 | struct igmphdr *ih = igmp_hdr(skb); |
948 | struct igmpv3_query *ih3 = igmpv3_query_hdr(skb); | |
1da177e4 | 949 | struct ip_mc_list *im; |
63007727 | 950 | __be32 group = ih->group; |
1da177e4 LT |
951 | int max_delay; |
952 | int mark = 0; | |
87a8a2ae | 953 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
954 | |
955 | ||
5b7c8406 | 956 | if (len == 8) { |
1da177e4 LT |
957 | if (ih->code == 0) { |
958 | /* Alas, old v1 router presents here. */ | |
e905a9ed | 959 | |
436f7c20 | 960 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
1da177e4 | 961 | in_dev->mr_v1_seen = jiffies + |
966c37f2 HL |
962 | (in_dev->mr_qrv * in_dev->mr_qi) + |
963 | in_dev->mr_qri; | |
1da177e4 LT |
964 | group = 0; |
965 | } else { | |
966 | /* v2 router present */ | |
967 | max_delay = ih->code*(HZ/IGMP_TIMER_SCALE); | |
968 | in_dev->mr_v2_seen = jiffies + | |
966c37f2 HL |
969 | (in_dev->mr_qrv * in_dev->mr_qi) + |
970 | in_dev->mr_qri; | |
1da177e4 LT |
971 | } |
972 | /* cancel the interface change timer */ | |
4a2b285e | 973 | WRITE_ONCE(in_dev->mr_ifc_count, 0); |
1da177e4 LT |
974 | if (del_timer(&in_dev->mr_ifc_timer)) |
975 | __in_dev_put(in_dev); | |
976 | /* clear deleted report items */ | |
977 | igmpv3_clear_delrec(in_dev); | |
978 | } else if (len < 12) { | |
d679c532 | 979 | return true; /* ignore bogus packet; freed by caller */ |
5b7c8406 DS |
980 | } else if (IGMP_V1_SEEN(in_dev)) { |
981 | /* This is a v3 query with v1 queriers present */ | |
436f7c20 | 982 | max_delay = IGMP_QUERY_RESPONSE_INTERVAL; |
5b7c8406 DS |
983 | group = 0; |
984 | } else if (IGMP_V2_SEEN(in_dev)) { | |
985 | /* this is a v3 query with v2 queriers present; | |
986 | * Interpretation of the max_delay code is problematic here. | |
987 | * A real v2 host would use ih_code directly, while v3 has a | |
988 | * different encoding. We use the v3 encoding as more likely | |
989 | * to be intended in a v3 query. | |
990 | */ | |
991 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
a8c1f65c BH |
992 | if (!max_delay) |
993 | max_delay = 1; /* can't mod w/ 0 */ | |
1da177e4 LT |
994 | } else { /* v3 */ |
995 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query))) | |
d679c532 | 996 | return true; |
e905a9ed | 997 | |
d9edf9e2 | 998 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 | 999 | if (ih3->nsrcs) { |
e905a9ed | 1000 | if (!pskb_may_pull(skb, sizeof(struct igmpv3_query) |
63007727 | 1001 | + ntohs(ih3->nsrcs)*sizeof(__be32))) |
d679c532 | 1002 | return true; |
d9edf9e2 | 1003 | ih3 = igmpv3_query_hdr(skb); |
1da177e4 LT |
1004 | } |
1005 | ||
1006 | max_delay = IGMPV3_MRC(ih3->code)*(HZ/IGMP_TIMER_SCALE); | |
1007 | if (!max_delay) | |
1008 | max_delay = 1; /* can't mod w/ 0 */ | |
1009 | in_dev->mr_maxdelay = max_delay; | |
966c37f2 HL |
1010 | |
1011 | /* RFC3376, 4.1.6. QRV and 4.1.7. QQIC, when the most recently | |
1012 | * received value was zero, use the default or statically | |
1013 | * configured value. | |
1014 | */ | |
8ebcc62c | 1015 | in_dev->mr_qrv = ih3->qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv); |
966c37f2 HL |
1016 | in_dev->mr_qi = IGMPV3_QQIC(ih3->qqic)*HZ ?: IGMP_QUERY_INTERVAL; |
1017 | ||
1018 | /* RFC3376, 8.3. Query Response Interval: | |
1019 | * The number of seconds represented by the [Query Response | |
1020 | * Interval] must be less than the [Query Interval]. | |
1021 | */ | |
1022 | if (in_dev->mr_qri >= in_dev->mr_qi) | |
1023 | in_dev->mr_qri = (in_dev->mr_qi/HZ - 1)*HZ; | |
1024 | ||
1da177e4 LT |
1025 | if (!group) { /* general query */ |
1026 | if (ih3->nsrcs) | |
b47bd8d2 | 1027 | return true; /* no sources allowed */ |
1da177e4 | 1028 | igmp_gq_start_timer(in_dev); |
d679c532 | 1029 | return false; |
1da177e4 LT |
1030 | } |
1031 | /* mark sources to include, if group & source-specific */ | |
1032 | mark = ih3->nsrcs != 0; | |
1033 | } | |
1034 | ||
1035 | /* | |
1036 | * - Start the timers in all of our membership records | |
1037 | * that the query applies to for the interface on | |
1038 | * which the query arrived excl. those that belong | |
1039 | * to a "local" group (224.0.0.X) | |
1040 | * - For timers already running check if they need to | |
1041 | * be reset. | |
1042 | * - Use the igmp->igmp_code field as the maximum | |
1043 | * delay possible | |
1044 | */ | |
1d7138de ED |
1045 | rcu_read_lock(); |
1046 | for_each_pmc_rcu(in_dev, im) { | |
ad12583f DS |
1047 | int changed; |
1048 | ||
1da177e4 LT |
1049 | if (group && group != im->multiaddr) |
1050 | continue; | |
1051 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1052 | continue; | |
df2cf4a7 | 1053 | if (ipv4_is_local_multicast(im->multiaddr) && |
f6da2267 | 1054 | !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports)) |
df2cf4a7 | 1055 | continue; |
1da177e4 LT |
1056 | spin_lock_bh(&im->lock); |
1057 | if (im->tm_running) | |
1058 | im->gsquery = im->gsquery && mark; | |
1059 | else | |
1060 | im->gsquery = mark; | |
ad12583f | 1061 | changed = !im->gsquery || |
e905a9ed | 1062 | igmp_marksources(im, ntohs(ih3->nsrcs), ih3->srcs); |
1da177e4 | 1063 | spin_unlock_bh(&im->lock); |
ad12583f DS |
1064 | if (changed) |
1065 | igmp_mod_timer(im, max_delay); | |
1da177e4 | 1066 | } |
1d7138de | 1067 | rcu_read_unlock(); |
d679c532 | 1068 | return false; |
1da177e4 LT |
1069 | } |
1070 | ||
9a57a9d2 | 1071 | /* called in rcu_read_lock() section */ |
1da177e4 LT |
1072 | int igmp_rcv(struct sk_buff *skb) |
1073 | { | |
1074 | /* This basically follows the spec line by line -- see RFC1112 */ | |
1075 | struct igmphdr *ih; | |
c7b725be DA |
1076 | struct net_device *dev = skb->dev; |
1077 | struct in_device *in_dev; | |
1da177e4 | 1078 | int len = skb->len; |
d679c532 | 1079 | bool dropped = true; |
1da177e4 | 1080 | |
c7b725be DA |
1081 | if (netif_is_l3_master(dev)) { |
1082 | dev = dev_get_by_index_rcu(dev_net(dev), IPCB(skb)->iif); | |
1083 | if (!dev) | |
1084 | goto drop; | |
1085 | } | |
1086 | ||
1087 | in_dev = __in_dev_get_rcu(dev); | |
51456b29 | 1088 | if (!in_dev) |
cd557bc1 | 1089 | goto drop; |
1da177e4 | 1090 | |
fb286bb2 | 1091 | if (!pskb_may_pull(skb, sizeof(struct igmphdr))) |
9a57a9d2 | 1092 | goto drop; |
fb286bb2 | 1093 | |
de08dc1a TH |
1094 | if (skb_checksum_simple_validate(skb)) |
1095 | goto drop; | |
1da177e4 | 1096 | |
d9edf9e2 | 1097 | ih = igmp_hdr(skb); |
1da177e4 LT |
1098 | switch (ih->type) { |
1099 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
d679c532 | 1100 | dropped = igmp_heard_query(in_dev, skb, len); |
1da177e4 LT |
1101 | break; |
1102 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1103 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
1da177e4 | 1104 | /* Is it our report looped back? */ |
c7537967 | 1105 | if (rt_is_output_route(skb_rtable(skb))) |
1da177e4 | 1106 | break; |
24c69275 DS |
1107 | /* don't rely on MC router hearing unicast reports */ |
1108 | if (skb->pkt_type == PACKET_MULTICAST || | |
1109 | skb->pkt_type == PACKET_BROADCAST) | |
d679c532 | 1110 | dropped = igmp_heard_report(in_dev, ih->group); |
1da177e4 LT |
1111 | break; |
1112 | case IGMP_PIM: | |
1113 | #ifdef CONFIG_IP_PIMSM_V1 | |
1da177e4 LT |
1114 | return pim_rcv_v1(skb); |
1115 | #endif | |
c6b471e6 | 1116 | case IGMPV3_HOST_MEMBERSHIP_REPORT: |
1da177e4 LT |
1117 | case IGMP_DVMRP: |
1118 | case IGMP_TRACE: | |
1119 | case IGMP_HOST_LEAVE_MESSAGE: | |
1120 | case IGMP_MTRACE: | |
1121 | case IGMP_MTRACE_RESP: | |
1122 | break; | |
1123 | default: | |
dd1c1853 | 1124 | break; |
1da177e4 | 1125 | } |
fb286bb2 | 1126 | |
cd557bc1 | 1127 | drop: |
d679c532 ED |
1128 | if (dropped) |
1129 | kfree_skb(skb); | |
1130 | else | |
1131 | consume_skb(skb); | |
1da177e4 LT |
1132 | return 0; |
1133 | } | |
1134 | ||
1135 | #endif | |
1136 | ||
1137 | ||
1138 | /* | |
1139 | * Add a filter to a device | |
1140 | */ | |
1141 | ||
63007727 | 1142 | static void ip_mc_filter_add(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1143 | { |
1144 | char buf[MAX_ADDR_LEN]; | |
1145 | struct net_device *dev = in_dev->dev; | |
1146 | ||
1147 | /* Checking for IFF_MULTICAST here is WRONG-WRONG-WRONG. | |
1148 | We will get multicast token leakage, when IFF_MULTICAST | |
b81693d9 | 1149 | is changed. This check should be done in ndo_set_rx_mode |
1da177e4 LT |
1150 | routine. Something sort of: |
1151 | if (dev->mc_list && dev->flags&IFF_MULTICAST) { do it; } | |
1152 | --ANK | |
1153 | */ | |
1154 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1155 | dev_mc_add(dev, buf); |
1da177e4 LT |
1156 | } |
1157 | ||
1158 | /* | |
1159 | * Remove a filter from a device | |
1160 | */ | |
1161 | ||
63007727 | 1162 | static void ip_mc_filter_del(struct in_device *in_dev, __be32 addr) |
1da177e4 LT |
1163 | { |
1164 | char buf[MAX_ADDR_LEN]; | |
1165 | struct net_device *dev = in_dev->dev; | |
1166 | ||
1167 | if (arp_mc_map(addr, buf, dev, 0) == 0) | |
22bedad3 | 1168 | dev_mc_del(dev, buf); |
1da177e4 LT |
1169 | } |
1170 | ||
1171 | #ifdef CONFIG_IP_MULTICAST | |
1172 | /* | |
1173 | * deleted ip_mc_list manipulation | |
1174 | */ | |
9fb20801 FF |
1175 | static void igmpv3_add_delrec(struct in_device *in_dev, struct ip_mc_list *im, |
1176 | gfp_t gfp) | |
1da177e4 LT |
1177 | { |
1178 | struct ip_mc_list *pmc; | |
165094af | 1179 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1180 | |
1181 | /* this is an "ip_mc_list" for convenience; only the fields below | |
1182 | * are actually used. In particular, the refcnt and users are not | |
1183 | * used for management of the delete list. Using the same structure | |
1184 | * for deleted items allows change reports to use common code with | |
1185 | * non-deleted or query-response MCA's. | |
1186 | */ | |
9fb20801 | 1187 | pmc = kzalloc(sizeof(*pmc), gfp); |
1da177e4 LT |
1188 | if (!pmc) |
1189 | return; | |
b4846fc3 | 1190 | spin_lock_init(&pmc->lock); |
1da177e4 LT |
1191 | spin_lock_bh(&im->lock); |
1192 | pmc->interface = im->interface; | |
1193 | in_dev_hold(in_dev); | |
1194 | pmc->multiaddr = im->multiaddr; | |
8ebcc62c | 1195 | pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv); |
1da177e4 LT |
1196 | pmc->sfmode = im->sfmode; |
1197 | if (pmc->sfmode == MCAST_INCLUDE) { | |
1198 | struct ip_sf_list *psf; | |
1199 | ||
1200 | pmc->tomb = im->tomb; | |
1201 | pmc->sources = im->sources; | |
1202 | im->tomb = im->sources = NULL; | |
c71151f0 | 1203 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1204 | psf->sf_crcount = pmc->crcount; |
1205 | } | |
1206 | spin_unlock_bh(&im->lock); | |
1207 | ||
1208 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1209 | pmc->next = in_dev->mc_tomb; | |
1210 | in_dev->mc_tomb = pmc; | |
1211 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1212 | } | |
1213 | ||
24803f38 HL |
1214 | /* |
1215 | * restore ip_mc_list deleted records | |
1216 | */ | |
1217 | static void igmpv3_del_delrec(struct in_device *in_dev, struct ip_mc_list *im) | |
1da177e4 LT |
1218 | { |
1219 | struct ip_mc_list *pmc, *pmc_prev; | |
24803f38 HL |
1220 | struct ip_sf_list *psf; |
1221 | struct net *net = dev_net(in_dev->dev); | |
1222 | __be32 multiaddr = im->multiaddr; | |
1da177e4 LT |
1223 | |
1224 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1225 | pmc_prev = NULL; | |
c71151f0 | 1226 | for (pmc = in_dev->mc_tomb; pmc; pmc = pmc->next) { |
1da177e4 LT |
1227 | if (pmc->multiaddr == multiaddr) |
1228 | break; | |
1229 | pmc_prev = pmc; | |
1230 | } | |
1231 | if (pmc) { | |
1232 | if (pmc_prev) | |
1233 | pmc_prev->next = pmc->next; | |
1234 | else | |
1235 | in_dev->mc_tomb = pmc->next; | |
1236 | } | |
1237 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
24803f38 HL |
1238 | |
1239 | spin_lock_bh(&im->lock); | |
1da177e4 | 1240 | if (pmc) { |
24803f38 | 1241 | im->interface = pmc->interface; |
08d3ffcc | 1242 | if (im->sfmode == MCAST_INCLUDE) { |
e5b1c6c6 ED |
1243 | swap(im->tomb, pmc->tomb); |
1244 | swap(im->sources, pmc->sources); | |
24803f38 | 1245 | for (psf = im->sources; psf; psf = psf->sf_next) |
8ebcc62c KI |
1246 | psf->sf_crcount = in_dev->mr_qrv ?: |
1247 | READ_ONCE(net->ipv4.sysctl_igmp_qrv); | |
6e2059b5 | 1248 | } else { |
8ebcc62c KI |
1249 | im->crcount = in_dev->mr_qrv ?: |
1250 | READ_ONCE(net->ipv4.sysctl_igmp_qrv); | |
1da177e4 LT |
1251 | } |
1252 | in_dev_put(pmc->interface); | |
3580d04a | 1253 | kfree_pmc(pmc); |
1da177e4 | 1254 | } |
24803f38 | 1255 | spin_unlock_bh(&im->lock); |
1da177e4 LT |
1256 | } |
1257 | ||
24803f38 HL |
1258 | /* |
1259 | * flush ip_mc_list deleted records | |
1260 | */ | |
1da177e4 LT |
1261 | static void igmpv3_clear_delrec(struct in_device *in_dev) |
1262 | { | |
1263 | struct ip_mc_list *pmc, *nextpmc; | |
1264 | ||
1265 | spin_lock_bh(&in_dev->mc_tomb_lock); | |
1266 | pmc = in_dev->mc_tomb; | |
1267 | in_dev->mc_tomb = NULL; | |
1268 | spin_unlock_bh(&in_dev->mc_tomb_lock); | |
1269 | ||
1270 | for (; pmc; pmc = nextpmc) { | |
1271 | nextpmc = pmc->next; | |
1272 | ip_mc_clear_src(pmc); | |
1273 | in_dev_put(pmc->interface); | |
3580d04a | 1274 | kfree_pmc(pmc); |
1da177e4 LT |
1275 | } |
1276 | /* clear dead sources, too */ | |
1d7138de ED |
1277 | rcu_read_lock(); |
1278 | for_each_pmc_rcu(in_dev, pmc) { | |
3580d04a | 1279 | struct ip_sf_list *psf; |
1da177e4 LT |
1280 | |
1281 | spin_lock_bh(&pmc->lock); | |
1282 | psf = pmc->tomb; | |
1283 | pmc->tomb = NULL; | |
1284 | spin_unlock_bh(&pmc->lock); | |
3580d04a | 1285 | ip_sf_list_clear_all(psf); |
1da177e4 | 1286 | } |
1d7138de | 1287 | rcu_read_unlock(); |
1da177e4 LT |
1288 | } |
1289 | #endif | |
1290 | ||
9fb20801 | 1291 | static void __igmp_group_dropped(struct ip_mc_list *im, gfp_t gfp) |
1da177e4 LT |
1292 | { |
1293 | struct in_device *in_dev = im->interface; | |
1294 | #ifdef CONFIG_IP_MULTICAST | |
87a8a2ae | 1295 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1296 | int reporter; |
1297 | #endif | |
1298 | ||
1299 | if (im->loaded) { | |
1300 | im->loaded = 0; | |
1301 | ip_mc_filter_del(in_dev, im->multiaddr); | |
1302 | } | |
1303 | ||
1304 | #ifdef CONFIG_IP_MULTICAST | |
1305 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1306 | return; | |
f6da2267 KI |
1307 | if (ipv4_is_local_multicast(im->multiaddr) && |
1308 | !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports)) | |
df2cf4a7 | 1309 | return; |
1da177e4 LT |
1310 | |
1311 | reporter = im->reporter; | |
1312 | igmp_stop_timer(im); | |
1313 | ||
1314 | if (!in_dev->dead) { | |
1315 | if (IGMP_V1_SEEN(in_dev)) | |
24cf3af3 | 1316 | return; |
1da177e4 LT |
1317 | if (IGMP_V2_SEEN(in_dev)) { |
1318 | if (reporter) | |
1319 | igmp_send_report(in_dev, im, IGMP_HOST_LEAVE_MESSAGE); | |
24cf3af3 | 1320 | return; |
1da177e4 LT |
1321 | } |
1322 | /* IGMPv3 */ | |
9fb20801 | 1323 | igmpv3_add_delrec(in_dev, im, gfp); |
1da177e4 LT |
1324 | |
1325 | igmp_ifc_event(in_dev); | |
1326 | } | |
1da177e4 | 1327 | #endif |
1da177e4 LT |
1328 | } |
1329 | ||
9fb20801 FF |
1330 | static void igmp_group_dropped(struct ip_mc_list *im) |
1331 | { | |
1332 | __igmp_group_dropped(im, GFP_KERNEL); | |
1333 | } | |
1334 | ||
0ae0d60a | 1335 | static void igmp_group_added(struct ip_mc_list *im) |
1da177e4 LT |
1336 | { |
1337 | struct in_device *in_dev = im->interface; | |
dcd87999 | 1338 | #ifdef CONFIG_IP_MULTICAST |
87a8a2ae | 1339 | struct net *net = dev_net(in_dev->dev); |
dcd87999 | 1340 | #endif |
1da177e4 LT |
1341 | |
1342 | if (im->loaded == 0) { | |
1343 | im->loaded = 1; | |
1344 | ip_mc_filter_add(in_dev, im->multiaddr); | |
1345 | } | |
1346 | ||
1347 | #ifdef CONFIG_IP_MULTICAST | |
1348 | if (im->multiaddr == IGMP_ALL_HOSTS) | |
1349 | return; | |
f6da2267 KI |
1350 | if (ipv4_is_local_multicast(im->multiaddr) && |
1351 | !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports)) | |
df2cf4a7 | 1352 | return; |
1da177e4 LT |
1353 | |
1354 | if (in_dev->dead) | |
1355 | return; | |
ff06525f | 1356 | |
8ebcc62c | 1357 | im->unsolicit_count = READ_ONCE(net->ipv4.sysctl_igmp_qrv); |
1da177e4 LT |
1358 | if (IGMP_V1_SEEN(in_dev) || IGMP_V2_SEEN(in_dev)) { |
1359 | spin_lock_bh(&im->lock); | |
436f7c20 | 1360 | igmp_start_timer(im, IGMP_INITIAL_REPORT_DELAY); |
1da177e4 LT |
1361 | spin_unlock_bh(&im->lock); |
1362 | return; | |
1363 | } | |
1364 | /* else, v3 */ | |
1365 | ||
6e2059b5 HL |
1366 | /* Based on RFC3376 5.1, for newly added INCLUDE SSM, we should |
1367 | * not send filter-mode change record as the mode should be from | |
1368 | * IN() to IN(A). | |
1369 | */ | |
0ae0d60a | 1370 | if (im->sfmode == MCAST_EXCLUDE) |
8ebcc62c | 1371 | im->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv); |
6e2059b5 | 1372 | |
1da177e4 LT |
1373 | igmp_ifc_event(in_dev); |
1374 | #endif | |
1375 | } | |
1376 | ||
1377 | ||
1378 | /* | |
1379 | * Multicast list managers | |
1380 | */ | |
1381 | ||
e9897071 ED |
1382 | static u32 ip_mc_hash(const struct ip_mc_list *im) |
1383 | { | |
c70eba74 | 1384 | return hash_32((__force u32)im->multiaddr, MC_HASH_SZ_LOG); |
e9897071 ED |
1385 | } |
1386 | ||
1387 | static void ip_mc_hash_add(struct in_device *in_dev, | |
1388 | struct ip_mc_list *im) | |
1389 | { | |
1390 | struct ip_mc_list __rcu **mc_hash; | |
1391 | u32 hash; | |
1392 | ||
1393 | mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1394 | if (mc_hash) { | |
1395 | hash = ip_mc_hash(im); | |
c70eba74 | 1396 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1397 | rcu_assign_pointer(mc_hash[hash], im); |
1398 | return; | |
1399 | } | |
1400 | ||
1401 | /* do not use a hash table for small number of items */ | |
1402 | if (in_dev->mc_count < 4) | |
1403 | return; | |
1404 | ||
1405 | mc_hash = kzalloc(sizeof(struct ip_mc_list *) << MC_HASH_SZ_LOG, | |
1406 | GFP_KERNEL); | |
1407 | if (!mc_hash) | |
1408 | return; | |
1409 | ||
1410 | for_each_pmc_rtnl(in_dev, im) { | |
1411 | hash = ip_mc_hash(im); | |
c70eba74 | 1412 | im->next_hash = mc_hash[hash]; |
e9897071 ED |
1413 | RCU_INIT_POINTER(mc_hash[hash], im); |
1414 | } | |
1415 | ||
1416 | rcu_assign_pointer(in_dev->mc_hash, mc_hash); | |
1417 | } | |
1418 | ||
1419 | static void ip_mc_hash_remove(struct in_device *in_dev, | |
1420 | struct ip_mc_list *im) | |
1421 | { | |
1422 | struct ip_mc_list __rcu **mc_hash = rtnl_dereference(in_dev->mc_hash); | |
1423 | struct ip_mc_list *aux; | |
1424 | ||
1425 | if (!mc_hash) | |
1426 | return; | |
1427 | mc_hash += ip_mc_hash(im); | |
1428 | while ((aux = rtnl_dereference(*mc_hash)) != im) | |
1429 | mc_hash = &aux->next_hash; | |
1430 | *mc_hash = im->next_hash; | |
1431 | } | |
1432 | ||
1da177e4 LT |
1433 | |
1434 | /* | |
1435 | * A socket has joined a multicast group on device dev. | |
1436 | */ | |
9fb20801 FF |
1437 | static void ____ip_mc_inc_group(struct in_device *in_dev, __be32 addr, |
1438 | unsigned int mode, gfp_t gfp) | |
1da177e4 LT |
1439 | { |
1440 | struct ip_mc_list *im; | |
1441 | ||
1442 | ASSERT_RTNL(); | |
1443 | ||
1d7138de | 1444 | for_each_pmc_rtnl(in_dev, im) { |
1da177e4 LT |
1445 | if (im->multiaddr == addr) { |
1446 | im->users++; | |
6e2059b5 | 1447 | ip_mc_add_src(in_dev, &addr, mode, 0, NULL, 0); |
1da177e4 LT |
1448 | goto out; |
1449 | } | |
1450 | } | |
1451 | ||
9fb20801 | 1452 | im = kzalloc(sizeof(*im), gfp); |
1da177e4 LT |
1453 | if (!im) |
1454 | goto out; | |
1455 | ||
a7e9ff73 JK |
1456 | im->users = 1; |
1457 | im->interface = in_dev; | |
1da177e4 | 1458 | in_dev_hold(in_dev); |
a7e9ff73 | 1459 | im->multiaddr = addr; |
1da177e4 | 1460 | /* initial mode is (EX, empty) */ |
6e2059b5 HL |
1461 | im->sfmode = mode; |
1462 | im->sfcount[mode] = 1; | |
8851ab52 | 1463 | refcount_set(&im->refcnt, 1); |
1da177e4 LT |
1464 | spin_lock_init(&im->lock); |
1465 | #ifdef CONFIG_IP_MULTICAST | |
e99e88a9 | 1466 | timer_setup(&im->timer, igmp_timer_expire, 0); |
1da177e4 | 1467 | #endif |
1d7138de ED |
1468 | |
1469 | im->next_rcu = in_dev->mc_list; | |
b8bae41e | 1470 | in_dev->mc_count++; |
cf778b00 | 1471 | rcu_assign_pointer(in_dev->mc_list, im); |
1d7138de | 1472 | |
e9897071 ED |
1473 | ip_mc_hash_add(in_dev, im); |
1474 | ||
1da177e4 | 1475 | #ifdef CONFIG_IP_MULTICAST |
24803f38 | 1476 | igmpv3_del_delrec(in_dev, im); |
1da177e4 | 1477 | #endif |
0ae0d60a | 1478 | igmp_group_added(im); |
1da177e4 LT |
1479 | if (!in_dev->dead) |
1480 | ip_rt_multicast_event(in_dev); | |
1481 | out: | |
1482 | return; | |
1483 | } | |
6e2059b5 | 1484 | |
9fb20801 FF |
1485 | void __ip_mc_inc_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) |
1486 | { | |
1487 | ____ip_mc_inc_group(in_dev, addr, MCAST_EXCLUDE, gfp); | |
1488 | } | |
1489 | EXPORT_SYMBOL(__ip_mc_inc_group); | |
1490 | ||
6e2059b5 HL |
1491 | void ip_mc_inc_group(struct in_device *in_dev, __be32 addr) |
1492 | { | |
a1c4cd67 | 1493 | __ip_mc_inc_group(in_dev, addr, GFP_KERNEL); |
6e2059b5 | 1494 | } |
4bc2f18b | 1495 | EXPORT_SYMBOL(ip_mc_inc_group); |
1da177e4 | 1496 | |
9afd85c9 LL |
1497 | static int ip_mc_check_iphdr(struct sk_buff *skb) |
1498 | { | |
1499 | const struct iphdr *iph; | |
1500 | unsigned int len; | |
1501 | unsigned int offset = skb_network_offset(skb) + sizeof(*iph); | |
1502 | ||
1503 | if (!pskb_may_pull(skb, offset)) | |
1504 | return -EINVAL; | |
1505 | ||
1506 | iph = ip_hdr(skb); | |
1507 | ||
1508 | if (iph->version != 4 || ip_hdrlen(skb) < sizeof(*iph)) | |
1509 | return -EINVAL; | |
1510 | ||
1511 | offset += ip_hdrlen(skb) - sizeof(*iph); | |
1512 | ||
1513 | if (!pskb_may_pull(skb, offset)) | |
1514 | return -EINVAL; | |
1515 | ||
1516 | iph = ip_hdr(skb); | |
1517 | ||
1518 | if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) | |
1519 | return -EINVAL; | |
1520 | ||
1521 | len = skb_network_offset(skb) + ntohs(iph->tot_len); | |
1522 | if (skb->len < len || len < offset) | |
1523 | return -EINVAL; | |
1524 | ||
1525 | skb_set_transport_header(skb, offset); | |
1526 | ||
1527 | return 0; | |
1528 | } | |
1529 | ||
1530 | static int ip_mc_check_igmp_reportv3(struct sk_buff *skb) | |
1531 | { | |
1532 | unsigned int len = skb_transport_offset(skb); | |
1533 | ||
1534 | len += sizeof(struct igmpv3_report); | |
1535 | ||
a2e2ca3b | 1536 | return ip_mc_may_pull(skb, len) ? 0 : -EINVAL; |
9afd85c9 LL |
1537 | } |
1538 | ||
1539 | static int ip_mc_check_igmp_query(struct sk_buff *skb) | |
1540 | { | |
a2e2ca3b LL |
1541 | unsigned int transport_len = ip_transport_len(skb); |
1542 | unsigned int len; | |
9afd85c9 LL |
1543 | |
1544 | /* IGMPv{1,2}? */ | |
a2e2ca3b | 1545 | if (transport_len != sizeof(struct igmphdr)) { |
9afd85c9 | 1546 | /* or IGMPv3? */ |
a2e2ca3b LL |
1547 | if (transport_len < sizeof(struct igmpv3_query)) |
1548 | return -EINVAL; | |
1549 | ||
1550 | len = skb_transport_offset(skb) + sizeof(struct igmpv3_query); | |
1551 | if (!ip_mc_may_pull(skb, len)) | |
9afd85c9 LL |
1552 | return -EINVAL; |
1553 | } | |
1554 | ||
1555 | /* RFC2236+RFC3376 (IGMPv2+IGMPv3) require the multicast link layer | |
1556 | * all-systems destination addresses (224.0.0.1) for general queries | |
1557 | */ | |
1558 | if (!igmp_hdr(skb)->group && | |
1559 | ip_hdr(skb)->daddr != htonl(INADDR_ALLHOSTS_GROUP)) | |
1560 | return -EINVAL; | |
1561 | ||
1562 | return 0; | |
1563 | } | |
1564 | ||
1565 | static int ip_mc_check_igmp_msg(struct sk_buff *skb) | |
1566 | { | |
1567 | switch (igmp_hdr(skb)->type) { | |
1568 | case IGMP_HOST_LEAVE_MESSAGE: | |
1569 | case IGMP_HOST_MEMBERSHIP_REPORT: | |
1570 | case IGMPV2_HOST_MEMBERSHIP_REPORT: | |
9afd85c9 LL |
1571 | return 0; |
1572 | case IGMPV3_HOST_MEMBERSHIP_REPORT: | |
1573 | return ip_mc_check_igmp_reportv3(skb); | |
1574 | case IGMP_HOST_MEMBERSHIP_QUERY: | |
1575 | return ip_mc_check_igmp_query(skb); | |
1576 | default: | |
1577 | return -ENOMSG; | |
1578 | } | |
1579 | } | |
1580 | ||
5a43f697 | 1581 | static __sum16 ip_mc_validate_checksum(struct sk_buff *skb) |
9afd85c9 LL |
1582 | { |
1583 | return skb_checksum_simple_validate(skb); | |
1584 | } | |
1585 | ||
a2e2ca3b | 1586 | static int ip_mc_check_igmp_csum(struct sk_buff *skb) |
9afd85c9 | 1587 | { |
9afd85c9 | 1588 | unsigned int len = skb_transport_offset(skb) + sizeof(struct igmphdr); |
a2e2ca3b LL |
1589 | unsigned int transport_len = ip_transport_len(skb); |
1590 | struct sk_buff *skb_chk; | |
9afd85c9 | 1591 | |
a2e2ca3b LL |
1592 | if (!ip_mc_may_pull(skb, len)) |
1593 | return -EINVAL; | |
9afd85c9 | 1594 | |
9afd85c9 LL |
1595 | skb_chk = skb_checksum_trimmed(skb, transport_len, |
1596 | ip_mc_validate_checksum); | |
1597 | if (!skb_chk) | |
a2e2ca3b | 1598 | return -EINVAL; |
a516993f | 1599 | |
a2e2ca3b | 1600 | if (skb_chk != skb) |
a516993f LL |
1601 | kfree_skb(skb_chk); |
1602 | ||
a2e2ca3b | 1603 | return 0; |
9afd85c9 LL |
1604 | } |
1605 | ||
1606 | /** | |
1607 | * ip_mc_check_igmp - checks whether this is a sane IGMP packet | |
1608 | * @skb: the skb to validate | |
9afd85c9 LL |
1609 | * |
1610 | * Checks whether an IPv4 packet is a valid IGMP packet. If so sets | |
a516993f | 1611 | * skb transport header accordingly and returns zero. |
9afd85c9 LL |
1612 | * |
1613 | * -EINVAL: A broken packet was detected, i.e. it violates some internet | |
1614 | * standard | |
1615 | * -ENOMSG: IP header validation succeeded but it is not an IGMP packet. | |
1616 | * -ENOMEM: A memory allocation failure happened. | |
1617 | * | |
a516993f LL |
1618 | * Caller needs to set the skb network header and free any returned skb if it |
1619 | * differs from the provided skb. | |
9afd85c9 | 1620 | */ |
ba5ea614 | 1621 | int ip_mc_check_igmp(struct sk_buff *skb) |
9afd85c9 LL |
1622 | { |
1623 | int ret = ip_mc_check_iphdr(skb); | |
1624 | ||
1625 | if (ret < 0) | |
1626 | return ret; | |
1627 | ||
1628 | if (ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
1629 | return -ENOMSG; | |
1630 | ||
a2e2ca3b LL |
1631 | ret = ip_mc_check_igmp_csum(skb); |
1632 | if (ret < 0) | |
1633 | return ret; | |
1634 | ||
1635 | return ip_mc_check_igmp_msg(skb); | |
9afd85c9 LL |
1636 | } |
1637 | EXPORT_SYMBOL(ip_mc_check_igmp); | |
1638 | ||
a816c7c7 | 1639 | /* |
4aa5dee4 | 1640 | * Resend IGMP JOIN report; used by netdev notifier. |
a816c7c7 | 1641 | */ |
4aa5dee4 | 1642 | static void ip_mc_rejoin_groups(struct in_device *in_dev) |
a816c7c7 | 1643 | { |
08882669 | 1644 | #ifdef CONFIG_IP_MULTICAST |
866f3b25 ED |
1645 | struct ip_mc_list *im; |
1646 | int type; | |
87a8a2ae | 1647 | struct net *net = dev_net(in_dev->dev); |
a816c7c7 | 1648 | |
4aa5dee4 JP |
1649 | ASSERT_RTNL(); |
1650 | ||
1651 | for_each_pmc_rtnl(in_dev, im) { | |
866f3b25 ED |
1652 | if (im->multiaddr == IGMP_ALL_HOSTS) |
1653 | continue; | |
df2cf4a7 | 1654 | if (ipv4_is_local_multicast(im->multiaddr) && |
f6da2267 | 1655 | !READ_ONCE(net->ipv4.sysctl_igmp_llm_reports)) |
df2cf4a7 | 1656 | continue; |
a816c7c7 | 1657 | |
866f3b25 ED |
1658 | /* a failover is happening and switches |
1659 | * must be notified immediately | |
1660 | */ | |
1661 | if (IGMP_V1_SEEN(in_dev)) | |
1662 | type = IGMP_HOST_MEMBERSHIP_REPORT; | |
1663 | else if (IGMP_V2_SEEN(in_dev)) | |
1664 | type = IGMPV2_HOST_MEMBERSHIP_REPORT; | |
1665 | else | |
1666 | type = IGMPV3_HOST_MEMBERSHIP_REPORT; | |
1667 | igmp_send_report(in_dev, im, type); | |
1668 | } | |
a816c7c7 JV |
1669 | #endif |
1670 | } | |
1671 | ||
1da177e4 LT |
1672 | /* |
1673 | * A socket has left a multicast group on device dev | |
1674 | */ | |
1675 | ||
9fb20801 | 1676 | void __ip_mc_dec_group(struct in_device *in_dev, __be32 addr, gfp_t gfp) |
1da177e4 | 1677 | { |
1d7138de ED |
1678 | struct ip_mc_list *i; |
1679 | struct ip_mc_list __rcu **ip; | |
e905a9ed | 1680 | |
1da177e4 | 1681 | ASSERT_RTNL(); |
e905a9ed | 1682 | |
1d7138de ED |
1683 | for (ip = &in_dev->mc_list; |
1684 | (i = rtnl_dereference(*ip)) != NULL; | |
1685 | ip = &i->next_rcu) { | |
a7e9ff73 | 1686 | if (i->multiaddr == addr) { |
1da177e4 | 1687 | if (--i->users == 0) { |
e9897071 | 1688 | ip_mc_hash_remove(in_dev, i); |
1d7138de | 1689 | *ip = i->next_rcu; |
b8bae41e | 1690 | in_dev->mc_count--; |
9fb20801 | 1691 | __igmp_group_dropped(i, gfp); |
24cf3af3 | 1692 | ip_mc_clear_src(i); |
1da177e4 LT |
1693 | |
1694 | if (!in_dev->dead) | |
1695 | ip_rt_multicast_event(in_dev); | |
1696 | ||
1697 | ip_ma_put(i); | |
1698 | return; | |
1699 | } | |
1700 | break; | |
1701 | } | |
1702 | } | |
1703 | } | |
9fb20801 | 1704 | EXPORT_SYMBOL(__ip_mc_dec_group); |
1da177e4 | 1705 | |
75c78500 MS |
1706 | /* Device changing type */ |
1707 | ||
1708 | void ip_mc_unmap(struct in_device *in_dev) | |
1709 | { | |
1d7138de | 1710 | struct ip_mc_list *pmc; |
75c78500 MS |
1711 | |
1712 | ASSERT_RTNL(); | |
1713 | ||
1d7138de ED |
1714 | for_each_pmc_rtnl(in_dev, pmc) |
1715 | igmp_group_dropped(pmc); | |
75c78500 MS |
1716 | } |
1717 | ||
1718 | void ip_mc_remap(struct in_device *in_dev) | |
1719 | { | |
1d7138de | 1720 | struct ip_mc_list *pmc; |
75c78500 MS |
1721 | |
1722 | ASSERT_RTNL(); | |
1723 | ||
24803f38 HL |
1724 | for_each_pmc_rtnl(in_dev, pmc) { |
1725 | #ifdef CONFIG_IP_MULTICAST | |
1726 | igmpv3_del_delrec(in_dev, pmc); | |
1727 | #endif | |
0ae0d60a | 1728 | igmp_group_added(pmc); |
24803f38 | 1729 | } |
75c78500 MS |
1730 | } |
1731 | ||
1da177e4 LT |
1732 | /* Device going down */ |
1733 | ||
1734 | void ip_mc_down(struct in_device *in_dev) | |
1735 | { | |
1d7138de | 1736 | struct ip_mc_list *pmc; |
1da177e4 LT |
1737 | |
1738 | ASSERT_RTNL(); | |
1739 | ||
1d7138de ED |
1740 | for_each_pmc_rtnl(in_dev, pmc) |
1741 | igmp_group_dropped(pmc); | |
1da177e4 LT |
1742 | |
1743 | #ifdef CONFIG_IP_MULTICAST | |
4a2b285e | 1744 | WRITE_ONCE(in_dev->mr_ifc_count, 0); |
1da177e4 LT |
1745 | if (del_timer(&in_dev->mr_ifc_timer)) |
1746 | __in_dev_put(in_dev); | |
1747 | in_dev->mr_gq_running = 0; | |
1748 | if (del_timer(&in_dev->mr_gq_timer)) | |
1749 | __in_dev_put(in_dev); | |
1da177e4 LT |
1750 | #endif |
1751 | ||
1752 | ip_mc_dec_group(in_dev, IGMP_ALL_HOSTS); | |
1753 | } | |
1754 | ||
dcd87999 | 1755 | #ifdef CONFIG_IP_MULTICAST |
966c37f2 HL |
1756 | static void ip_mc_reset(struct in_device *in_dev) |
1757 | { | |
165094af | 1758 | struct net *net = dev_net(in_dev->dev); |
966c37f2 HL |
1759 | |
1760 | in_dev->mr_qi = IGMP_QUERY_INTERVAL; | |
1761 | in_dev->mr_qri = IGMP_QUERY_RESPONSE_INTERVAL; | |
8ebcc62c | 1762 | in_dev->mr_qrv = READ_ONCE(net->ipv4.sysctl_igmp_qrv); |
966c37f2 HL |
1763 | } |
1764 | #else | |
1765 | static void ip_mc_reset(struct in_device *in_dev) | |
1766 | { | |
1767 | } | |
dcd87999 | 1768 | #endif |
966c37f2 HL |
1769 | |
1770 | void ip_mc_init_dev(struct in_device *in_dev) | |
1771 | { | |
1da177e4 LT |
1772 | ASSERT_RTNL(); |
1773 | ||
1da177e4 | 1774 | #ifdef CONFIG_IP_MULTICAST |
e99e88a9 KC |
1775 | timer_setup(&in_dev->mr_gq_timer, igmp_gq_timer_expire, 0); |
1776 | timer_setup(&in_dev->mr_ifc_timer, igmp_ifc_timer_expire, 0); | |
1da177e4 | 1777 | #endif |
966c37f2 | 1778 | ip_mc_reset(in_dev); |
1da177e4 | 1779 | |
1da177e4 LT |
1780 | spin_lock_init(&in_dev->mc_tomb_lock); |
1781 | } | |
1782 | ||
1783 | /* Device going up */ | |
1784 | ||
1785 | void ip_mc_up(struct in_device *in_dev) | |
1786 | { | |
1d7138de | 1787 | struct ip_mc_list *pmc; |
1da177e4 LT |
1788 | |
1789 | ASSERT_RTNL(); | |
1790 | ||
966c37f2 | 1791 | ip_mc_reset(in_dev); |
1da177e4 LT |
1792 | ip_mc_inc_group(in_dev, IGMP_ALL_HOSTS); |
1793 | ||
24803f38 HL |
1794 | for_each_pmc_rtnl(in_dev, pmc) { |
1795 | #ifdef CONFIG_IP_MULTICAST | |
1796 | igmpv3_del_delrec(in_dev, pmc); | |
1797 | #endif | |
0ae0d60a | 1798 | igmp_group_added(pmc); |
24803f38 | 1799 | } |
1da177e4 LT |
1800 | } |
1801 | ||
1802 | /* | |
1803 | * Device is about to be destroyed: clean up. | |
1804 | */ | |
1805 | ||
1806 | void ip_mc_destroy_dev(struct in_device *in_dev) | |
1807 | { | |
1808 | struct ip_mc_list *i; | |
1809 | ||
1810 | ASSERT_RTNL(); | |
1811 | ||
1812 | /* Deactivate timers */ | |
1813 | ip_mc_down(in_dev); | |
24803f38 HL |
1814 | #ifdef CONFIG_IP_MULTICAST |
1815 | igmpv3_clear_delrec(in_dev); | |
1816 | #endif | |
1da177e4 | 1817 | |
1d7138de ED |
1818 | while ((i = rtnl_dereference(in_dev->mc_list)) != NULL) { |
1819 | in_dev->mc_list = i->next_rcu; | |
b8bae41e | 1820 | in_dev->mc_count--; |
d8e29730 | 1821 | ip_mc_clear_src(i); |
1da177e4 | 1822 | ip_ma_put(i); |
1da177e4 | 1823 | } |
1da177e4 LT |
1824 | } |
1825 | ||
9e917dca | 1826 | /* RTNL is locked */ |
877acedc | 1827 | static struct in_device *ip_mc_find_dev(struct net *net, struct ip_mreqn *imr) |
1da177e4 | 1828 | { |
1da177e4 LT |
1829 | struct net_device *dev = NULL; |
1830 | struct in_device *idev = NULL; | |
1831 | ||
1832 | if (imr->imr_ifindex) { | |
877acedc | 1833 | idev = inetdev_by_index(net, imr->imr_ifindex); |
1da177e4 LT |
1834 | return idev; |
1835 | } | |
1836 | if (imr->imr_address.s_addr) { | |
9e917dca | 1837 | dev = __ip_dev_find(net, imr->imr_address.s_addr, false); |
1da177e4 LT |
1838 | if (!dev) |
1839 | return NULL; | |
1da177e4 LT |
1840 | } |
1841 | ||
b23dd4fe | 1842 | if (!dev) { |
78fbfd8a DM |
1843 | struct rtable *rt = ip_route_output(net, |
1844 | imr->imr_multiaddr.s_addr, | |
ec20b283 GN |
1845 | 0, 0, 0, |
1846 | RT_SCOPE_UNIVERSE); | |
b23dd4fe DM |
1847 | if (!IS_ERR(rt)) { |
1848 | dev = rt->dst.dev; | |
1849 | ip_rt_put(rt); | |
1850 | } | |
1da177e4 LT |
1851 | } |
1852 | if (dev) { | |
1853 | imr->imr_ifindex = dev->ifindex; | |
e5ed6399 | 1854 | idev = __in_dev_get_rtnl(dev); |
1da177e4 LT |
1855 | } |
1856 | return idev; | |
1857 | } | |
1858 | ||
1859 | /* | |
1860 | * Join a socket to a group | |
1861 | */ | |
1da177e4 LT |
1862 | |
1863 | static int ip_mc_del1_src(struct ip_mc_list *pmc, int sfmode, | |
8f935bbd | 1864 | __be32 *psfsrc) |
1da177e4 LT |
1865 | { |
1866 | struct ip_sf_list *psf, *psf_prev; | |
1867 | int rv = 0; | |
1868 | ||
1869 | psf_prev = NULL; | |
c71151f0 | 1870 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1871 | if (psf->sf_inaddr == *psfsrc) |
1872 | break; | |
1873 | psf_prev = psf; | |
1874 | } | |
1875 | if (!psf || psf->sf_count[sfmode] == 0) { | |
1876 | /* source filter not found, or count wrong => bug */ | |
1877 | return -ESRCH; | |
1878 | } | |
1879 | psf->sf_count[sfmode]--; | |
1880 | if (psf->sf_count[sfmode] == 0) { | |
1881 | ip_rt_multicast_event(pmc->interface); | |
1882 | } | |
1883 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { | |
1884 | #ifdef CONFIG_IP_MULTICAST | |
1885 | struct in_device *in_dev = pmc->interface; | |
165094af | 1886 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1887 | #endif |
1888 | ||
1889 | /* no more filters for this source */ | |
1890 | if (psf_prev) | |
1891 | psf_prev->sf_next = psf->sf_next; | |
1892 | else | |
1893 | pmc->sources = psf->sf_next; | |
1894 | #ifdef CONFIG_IP_MULTICAST | |
1895 | if (psf->sf_oldin && | |
1896 | !IGMP_V1_SEEN(in_dev) && !IGMP_V2_SEEN(in_dev)) { | |
8ebcc62c | 1897 | psf->sf_crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv); |
1da177e4 LT |
1898 | psf->sf_next = pmc->tomb; |
1899 | pmc->tomb = psf; | |
1900 | rv = 1; | |
1901 | } else | |
1902 | #endif | |
1903 | kfree(psf); | |
1904 | } | |
1905 | return rv; | |
1906 | } | |
1907 | ||
1908 | #ifndef CONFIG_IP_MULTICAST | |
1909 | #define igmp_ifc_event(x) do { } while (0) | |
1910 | #endif | |
1911 | ||
8f935bbd AV |
1912 | static int ip_mc_del_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
1913 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
1914 | { |
1915 | struct ip_mc_list *pmc; | |
1916 | int changerec = 0; | |
1917 | int i, err; | |
1918 | ||
1919 | if (!in_dev) | |
1920 | return -ENODEV; | |
1d7138de ED |
1921 | rcu_read_lock(); |
1922 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
1923 | if (*pmca == pmc->multiaddr) |
1924 | break; | |
1925 | } | |
1926 | if (!pmc) { | |
1927 | /* MCA not found?? bug */ | |
1d7138de | 1928 | rcu_read_unlock(); |
1da177e4 LT |
1929 | return -ESRCH; |
1930 | } | |
1931 | spin_lock_bh(&pmc->lock); | |
1d7138de | 1932 | rcu_read_unlock(); |
1da177e4 LT |
1933 | #ifdef CONFIG_IP_MULTICAST |
1934 | sf_markstate(pmc); | |
1935 | #endif | |
1936 | if (!delta) { | |
1937 | err = -EINVAL; | |
1938 | if (!pmc->sfcount[sfmode]) | |
1939 | goto out_unlock; | |
1940 | pmc->sfcount[sfmode]--; | |
1941 | } | |
1942 | err = 0; | |
c71151f0 | 1943 | for (i = 0; i < sfcount; i++) { |
1da177e4 LT |
1944 | int rv = ip_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
1945 | ||
1946 | changerec |= rv > 0; | |
1947 | if (!err && rv < 0) | |
1948 | err = rv; | |
1949 | } | |
1950 | if (pmc->sfmode == MCAST_EXCLUDE && | |
1951 | pmc->sfcount[MCAST_EXCLUDE] == 0 && | |
1952 | pmc->sfcount[MCAST_INCLUDE]) { | |
1953 | #ifdef CONFIG_IP_MULTICAST | |
1954 | struct ip_sf_list *psf; | |
165094af | 1955 | struct net *net = dev_net(in_dev->dev); |
1da177e4 LT |
1956 | #endif |
1957 | ||
1958 | /* filter mode change */ | |
1959 | pmc->sfmode = MCAST_INCLUDE; | |
1960 | #ifdef CONFIG_IP_MULTICAST | |
8ebcc62c | 1961 | pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv); |
4a2b285e | 1962 | WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount); |
c71151f0 | 1963 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
1964 | psf->sf_crcount = 0; |
1965 | igmp_ifc_event(pmc->interface); | |
1966 | } else if (sf_setstate(pmc) || changerec) { | |
1967 | igmp_ifc_event(pmc->interface); | |
1968 | #endif | |
1969 | } | |
1970 | out_unlock: | |
1971 | spin_unlock_bh(&pmc->lock); | |
1972 | return err; | |
1973 | } | |
1974 | ||
1975 | /* | |
1976 | * Add multicast single-source filter to the interface list | |
1977 | */ | |
1978 | static int ip_mc_add1_src(struct ip_mc_list *pmc, int sfmode, | |
5eb81e89 | 1979 | __be32 *psfsrc) |
1da177e4 LT |
1980 | { |
1981 | struct ip_sf_list *psf, *psf_prev; | |
1982 | ||
1983 | psf_prev = NULL; | |
c71151f0 | 1984 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
1985 | if (psf->sf_inaddr == *psfsrc) |
1986 | break; | |
1987 | psf_prev = psf; | |
1988 | } | |
1989 | if (!psf) { | |
0da974f4 | 1990 | psf = kzalloc(sizeof(*psf), GFP_ATOMIC); |
1da177e4 LT |
1991 | if (!psf) |
1992 | return -ENOBUFS; | |
1da177e4 LT |
1993 | psf->sf_inaddr = *psfsrc; |
1994 | if (psf_prev) { | |
1995 | psf_prev->sf_next = psf; | |
1996 | } else | |
1997 | pmc->sources = psf; | |
1998 | } | |
1999 | psf->sf_count[sfmode]++; | |
2000 | if (psf->sf_count[sfmode] == 1) { | |
2001 | ip_rt_multicast_event(pmc->interface); | |
2002 | } | |
2003 | return 0; | |
2004 | } | |
2005 | ||
2006 | #ifdef CONFIG_IP_MULTICAST | |
2007 | static void sf_markstate(struct ip_mc_list *pmc) | |
2008 | { | |
2009 | struct ip_sf_list *psf; | |
2010 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; | |
2011 | ||
c71151f0 | 2012 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2013 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
2014 | psf->sf_oldin = mca_xcount == | |
2015 | psf->sf_count[MCAST_EXCLUDE] && | |
2016 | !psf->sf_count[MCAST_INCLUDE]; | |
2017 | } else | |
2018 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; | |
2019 | } | |
2020 | ||
2021 | static int sf_setstate(struct ip_mc_list *pmc) | |
2022 | { | |
ad12583f | 2023 | struct ip_sf_list *psf, *dpsf; |
1da177e4 LT |
2024 | int mca_xcount = pmc->sfcount[MCAST_EXCLUDE]; |
2025 | int qrv = pmc->interface->mr_qrv; | |
2026 | int new_in, rv; | |
2027 | ||
2028 | rv = 0; | |
c71151f0 | 2029 | for (psf = pmc->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2030 | if (pmc->sfcount[MCAST_EXCLUDE]) { |
2031 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && | |
2032 | !psf->sf_count[MCAST_INCLUDE]; | |
2033 | } else | |
2034 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; | |
ad12583f DS |
2035 | if (new_in) { |
2036 | if (!psf->sf_oldin) { | |
76edc605 | 2037 | struct ip_sf_list *prev = NULL; |
ad12583f | 2038 | |
c71151f0 | 2039 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) { |
ad12583f DS |
2040 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
2041 | break; | |
2042 | prev = dpsf; | |
2043 | } | |
2044 | if (dpsf) { | |
2045 | if (prev) | |
2046 | prev->sf_next = dpsf->sf_next; | |
2047 | else | |
2048 | pmc->tomb = dpsf->sf_next; | |
2049 | kfree(dpsf); | |
2050 | } | |
2051 | psf->sf_crcount = qrv; | |
2052 | rv++; | |
2053 | } | |
2054 | } else if (psf->sf_oldin) { | |
2055 | ||
2056 | psf->sf_crcount = 0; | |
2057 | /* | |
2058 | * add or update "delete" records if an active filter | |
2059 | * is now inactive | |
2060 | */ | |
c71151f0 | 2061 | for (dpsf = pmc->tomb; dpsf; dpsf = dpsf->sf_next) |
ad12583f DS |
2062 | if (dpsf->sf_inaddr == psf->sf_inaddr) |
2063 | break; | |
2064 | if (!dpsf) { | |
3ed37a6f | 2065 | dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC); |
ad12583f DS |
2066 | if (!dpsf) |
2067 | continue; | |
2068 | *dpsf = *psf; | |
2069 | /* pmc->lock held by callers */ | |
2070 | dpsf->sf_next = pmc->tomb; | |
2071 | pmc->tomb = dpsf; | |
2072 | } | |
2073 | dpsf->sf_crcount = qrv; | |
1da177e4 LT |
2074 | rv++; |
2075 | } | |
2076 | } | |
2077 | return rv; | |
2078 | } | |
2079 | #endif | |
2080 | ||
2081 | /* | |
2082 | * Add multicast source filter list to the interface list | |
2083 | */ | |
8f935bbd AV |
2084 | static int ip_mc_add_src(struct in_device *in_dev, __be32 *pmca, int sfmode, |
2085 | int sfcount, __be32 *psfsrc, int delta) | |
1da177e4 LT |
2086 | { |
2087 | struct ip_mc_list *pmc; | |
2088 | int isexclude; | |
2089 | int i, err; | |
2090 | ||
2091 | if (!in_dev) | |
2092 | return -ENODEV; | |
1d7138de ED |
2093 | rcu_read_lock(); |
2094 | for_each_pmc_rcu(in_dev, pmc) { | |
1da177e4 LT |
2095 | if (*pmca == pmc->multiaddr) |
2096 | break; | |
2097 | } | |
2098 | if (!pmc) { | |
2099 | /* MCA not found?? bug */ | |
1d7138de | 2100 | rcu_read_unlock(); |
1da177e4 LT |
2101 | return -ESRCH; |
2102 | } | |
2103 | spin_lock_bh(&pmc->lock); | |
1d7138de | 2104 | rcu_read_unlock(); |
1da177e4 LT |
2105 | |
2106 | #ifdef CONFIG_IP_MULTICAST | |
2107 | sf_markstate(pmc); | |
2108 | #endif | |
2109 | isexclude = pmc->sfmode == MCAST_EXCLUDE; | |
2110 | if (!delta) | |
2111 | pmc->sfcount[sfmode]++; | |
2112 | err = 0; | |
c71151f0 | 2113 | for (i = 0; i < sfcount; i++) { |
5eb81e89 | 2114 | err = ip_mc_add1_src(pmc, sfmode, &psfsrc[i]); |
1da177e4 LT |
2115 | if (err) |
2116 | break; | |
2117 | } | |
2118 | if (err) { | |
2119 | int j; | |
2120 | ||
685f94e6 JZ |
2121 | if (!delta) |
2122 | pmc->sfcount[sfmode]--; | |
c71151f0 | 2123 | for (j = 0; j < i; j++) |
a1889c0d | 2124 | (void) ip_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
1da177e4 LT |
2125 | } else if (isexclude != (pmc->sfcount[MCAST_EXCLUDE] != 0)) { |
2126 | #ifdef CONFIG_IP_MULTICAST | |
1da177e4 | 2127 | struct ip_sf_list *psf; |
165094af | 2128 | struct net *net = dev_net(pmc->interface->dev); |
cfcabdcc | 2129 | in_dev = pmc->interface; |
1da177e4 LT |
2130 | #endif |
2131 | ||
2132 | /* filter mode change */ | |
2133 | if (pmc->sfcount[MCAST_EXCLUDE]) | |
2134 | pmc->sfmode = MCAST_EXCLUDE; | |
2135 | else if (pmc->sfcount[MCAST_INCLUDE]) | |
2136 | pmc->sfmode = MCAST_INCLUDE; | |
2137 | #ifdef CONFIG_IP_MULTICAST | |
2138 | /* else no filters; keep old mode for reports */ | |
2139 | ||
8ebcc62c | 2140 | pmc->crcount = in_dev->mr_qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv); |
4a2b285e | 2141 | WRITE_ONCE(in_dev->mr_ifc_count, pmc->crcount); |
c71151f0 | 2142 | for (psf = pmc->sources; psf; psf = psf->sf_next) |
1da177e4 LT |
2143 | psf->sf_crcount = 0; |
2144 | igmp_ifc_event(in_dev); | |
2145 | } else if (sf_setstate(pmc)) { | |
2146 | igmp_ifc_event(in_dev); | |
2147 | #endif | |
2148 | } | |
2149 | spin_unlock_bh(&pmc->lock); | |
2150 | return err; | |
2151 | } | |
2152 | ||
2153 | static void ip_mc_clear_src(struct ip_mc_list *pmc) | |
2154 | { | |
3580d04a | 2155 | struct ip_sf_list *tomb, *sources; |
1da177e4 | 2156 | |
c38b7d32 WC |
2157 | spin_lock_bh(&pmc->lock); |
2158 | tomb = pmc->tomb; | |
2159 | pmc->tomb = NULL; | |
2160 | sources = pmc->sources; | |
2161 | pmc->sources = NULL; | |
2162 | pmc->sfmode = MCAST_EXCLUDE; | |
2163 | pmc->sfcount[MCAST_INCLUDE] = 0; | |
2164 | pmc->sfcount[MCAST_EXCLUDE] = 1; | |
2165 | spin_unlock_bh(&pmc->lock); | |
2166 | ||
3580d04a ED |
2167 | ip_sf_list_clear_all(tomb); |
2168 | ip_sf_list_clear_all(sources); | |
1da177e4 LT |
2169 | } |
2170 | ||
54ff9ef3 MRL |
2171 | /* Join a multicast group |
2172 | */ | |
6e2059b5 HL |
2173 | static int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr, |
2174 | unsigned int mode) | |
1da177e4 | 2175 | { |
8f935bbd | 2176 | __be32 addr = imr->imr_multiaddr.s_addr; |
959d10f6 | 2177 | struct ip_mc_socklist *iml, *i; |
1da177e4 LT |
2178 | struct in_device *in_dev; |
2179 | struct inet_sock *inet = inet_sk(sk); | |
877acedc | 2180 | struct net *net = sock_net(sk); |
ca9b907d | 2181 | int ifindex; |
1da177e4 | 2182 | int count = 0; |
959d10f6 ED |
2183 | int err; |
2184 | ||
2185 | ASSERT_RTNL(); | |
1da177e4 | 2186 | |
f97c1e0c | 2187 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2188 | return -EINVAL; |
2189 | ||
877acedc | 2190 | in_dev = ip_mc_find_dev(net, imr); |
1da177e4 LT |
2191 | |
2192 | if (!in_dev) { | |
1da177e4 LT |
2193 | err = -ENODEV; |
2194 | goto done; | |
2195 | } | |
2196 | ||
1da177e4 | 2197 | err = -EADDRINUSE; |
ca9b907d | 2198 | ifindex = imr->imr_ifindex; |
1d7138de | 2199 | for_each_pmc_rtnl(inet, i) { |
ca9b907d DS |
2200 | if (i->multi.imr_multiaddr.s_addr == addr && |
2201 | i->multi.imr_ifindex == ifindex) | |
1da177e4 | 2202 | goto done; |
1da177e4 LT |
2203 | count++; |
2204 | } | |
2205 | err = -ENOBUFS; | |
6305d821 | 2206 | if (count >= READ_ONCE(net->ipv4.sysctl_igmp_max_memberships)) |
ca9b907d | 2207 | goto done; |
a7e9ff73 | 2208 | iml = sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); |
51456b29 | 2209 | if (!iml) |
1da177e4 | 2210 | goto done; |
ca9b907d | 2211 | |
1da177e4 | 2212 | memcpy(&iml->multi, imr, sizeof(*imr)); |
1d7138de | 2213 | iml->next_rcu = inet->mc_list; |
1da177e4 | 2214 | iml->sflist = NULL; |
6e2059b5 | 2215 | iml->sfmode = mode; |
cf778b00 | 2216 | rcu_assign_pointer(inet->mc_list, iml); |
a1c4cd67 | 2217 | ____ip_mc_inc_group(in_dev, addr, mode, GFP_KERNEL); |
1da177e4 | 2218 | err = 0; |
1da177e4 | 2219 | done: |
1da177e4 LT |
2220 | return err; |
2221 | } | |
6e2059b5 HL |
2222 | |
2223 | /* Join ASM (Any-Source Multicast) group | |
2224 | */ | |
2225 | int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr) | |
2226 | { | |
2227 | return __ip_mc_join_group(sk, imr, MCAST_EXCLUDE); | |
2228 | } | |
4bc2f18b | 2229 | EXPORT_SYMBOL(ip_mc_join_group); |
1da177e4 | 2230 | |
6e2059b5 HL |
2231 | /* Join SSM (Source-Specific Multicast) group |
2232 | */ | |
2233 | int ip_mc_join_group_ssm(struct sock *sk, struct ip_mreqn *imr, | |
2234 | unsigned int mode) | |
2235 | { | |
2236 | return __ip_mc_join_group(sk, imr, mode); | |
2237 | } | |
2238 | ||
1da177e4 LT |
2239 | static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml, |
2240 | struct in_device *in_dev) | |
2241 | { | |
1d7138de | 2242 | struct ip_sf_socklist *psf = rtnl_dereference(iml->sflist); |
1da177e4 LT |
2243 | int err; |
2244 | ||
51456b29 | 2245 | if (!psf) { |
1da177e4 LT |
2246 | /* any-source empty exclude case */ |
2247 | return ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
2248 | iml->sfmode, 0, NULL, 0); | |
2249 | } | |
2250 | err = ip_mc_del_src(in_dev, &iml->multi.imr_multiaddr.s_addr, | |
c85bb41e | 2251 | iml->sfmode, psf->sl_count, psf->sl_addr, 0); |
a9b3cd7f | 2252 | RCU_INIT_POINTER(iml->sflist, NULL); |
c85bb41e | 2253 | /* decrease mem now to avoid the memleak warning */ |
e6a1f7e0 | 2254 | atomic_sub(struct_size(psf, sl_addr, psf->sl_max), &sk->sk_omem_alloc); |
7519cce4 | 2255 | kfree_rcu(psf, rcu); |
1da177e4 LT |
2256 | return err; |
2257 | } | |
2258 | ||
54ff9ef3 | 2259 | int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr) |
1da177e4 LT |
2260 | { |
2261 | struct inet_sock *inet = inet_sk(sk); | |
1d7138de ED |
2262 | struct ip_mc_socklist *iml; |
2263 | struct ip_mc_socklist __rcu **imlp; | |
84b42bae | 2264 | struct in_device *in_dev; |
877acedc | 2265 | struct net *net = sock_net(sk); |
8f935bbd | 2266 | __be32 group = imr->imr_multiaddr.s_addr; |
84b42bae | 2267 | u32 ifindex; |
acd6e00b | 2268 | int ret = -EADDRNOTAVAIL; |
1da177e4 | 2269 | |
959d10f6 ED |
2270 | ASSERT_RTNL(); |
2271 | ||
877acedc | 2272 | in_dev = ip_mc_find_dev(net, imr); |
4eba7bb1 | 2273 | if (!imr->imr_ifindex && !imr->imr_address.s_addr && !in_dev) { |
52ad353a | 2274 | ret = -ENODEV; |
2275 | goto out; | |
2276 | } | |
84b42bae | 2277 | ifindex = imr->imr_ifindex; |
1d7138de ED |
2278 | for (imlp = &inet->mc_list; |
2279 | (iml = rtnl_dereference(*imlp)) != NULL; | |
2280 | imlp = &iml->next_rcu) { | |
acd6e00b DS |
2281 | if (iml->multi.imr_multiaddr.s_addr != group) |
2282 | continue; | |
2283 | if (ifindex) { | |
2284 | if (iml->multi.imr_ifindex != ifindex) | |
2285 | continue; | |
2286 | } else if (imr->imr_address.s_addr && imr->imr_address.s_addr != | |
2287 | iml->multi.imr_address.s_addr) | |
2288 | continue; | |
1da177e4 | 2289 | |
acd6e00b | 2290 | (void) ip_mc_leave_src(sk, iml, in_dev); |
1da177e4 | 2291 | |
1d7138de | 2292 | *imlp = iml->next_rcu; |
acd6e00b | 2293 | |
4eba7bb1 AL |
2294 | if (in_dev) |
2295 | ip_mc_dec_group(in_dev, group); | |
959d10f6 | 2296 | |
c85bb41e FL |
2297 | /* decrease mem now to avoid the memleak warning */ |
2298 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2299 | kfree_rcu(iml, rcu); |
acd6e00b | 2300 | return 0; |
1da177e4 | 2301 | } |
52ad353a | 2302 | out: |
959d10f6 ED |
2303 | return ret; |
2304 | } | |
193ba924 | 2305 | EXPORT_SYMBOL(ip_mc_leave_group); |
1da177e4 LT |
2306 | |
2307 | int ip_mc_source(int add, int omode, struct sock *sk, struct | |
2308 | ip_mreq_source *mreqs, int ifindex) | |
2309 | { | |
2310 | int err; | |
2311 | struct ip_mreqn imr; | |
63007727 | 2312 | __be32 addr = mreqs->imr_multiaddr; |
1da177e4 LT |
2313 | struct ip_mc_socklist *pmc; |
2314 | struct in_device *in_dev = NULL; | |
2315 | struct inet_sock *inet = inet_sk(sk); | |
2316 | struct ip_sf_socklist *psl; | |
877acedc | 2317 | struct net *net = sock_net(sk); |
8cdaaa15 | 2318 | int leavegroup = 0; |
1da177e4 LT |
2319 | int i, j, rv; |
2320 | ||
f97c1e0c | 2321 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2322 | return -EINVAL; |
2323 | ||
54ff9ef3 | 2324 | ASSERT_RTNL(); |
1da177e4 LT |
2325 | |
2326 | imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr; | |
2327 | imr.imr_address.s_addr = mreqs->imr_interface; | |
2328 | imr.imr_ifindex = ifindex; | |
877acedc | 2329 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2330 | |
2331 | if (!in_dev) { | |
2332 | err = -ENODEV; | |
2333 | goto done; | |
2334 | } | |
2335 | err = -EADDRNOTAVAIL; | |
2336 | ||
1d7138de | 2337 | for_each_pmc_rtnl(inet, pmc) { |
f64f9e71 JP |
2338 | if ((pmc->multi.imr_multiaddr.s_addr == |
2339 | imr.imr_multiaddr.s_addr) && | |
2340 | (pmc->multi.imr_ifindex == imr.imr_ifindex)) | |
1da177e4 LT |
2341 | break; |
2342 | } | |
917f2f10 DS |
2343 | if (!pmc) { /* must have a prior join */ |
2344 | err = -EINVAL; | |
1da177e4 | 2345 | goto done; |
917f2f10 | 2346 | } |
1da177e4 LT |
2347 | /* if a source filter was set, must be the same mode as before */ |
2348 | if (pmc->sflist) { | |
917f2f10 DS |
2349 | if (pmc->sfmode != omode) { |
2350 | err = -EINVAL; | |
1da177e4 | 2351 | goto done; |
917f2f10 | 2352 | } |
1da177e4 LT |
2353 | } else if (pmc->sfmode != omode) { |
2354 | /* allow mode switches for empty-set filters */ | |
2355 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 0, NULL, 0); | |
e905a9ed | 2356 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, pmc->sfmode, 0, |
1da177e4 LT |
2357 | NULL, 0); |
2358 | pmc->sfmode = omode; | |
2359 | } | |
2360 | ||
1d7138de | 2361 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2362 | if (!add) { |
2363 | if (!psl) | |
917f2f10 | 2364 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2365 | rv = !0; |
c71151f0 | 2366 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2367 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2368 | sizeof(__be32)); |
1da177e4 LT |
2369 | if (rv == 0) |
2370 | break; | |
2371 | } | |
2372 | if (rv) /* source not found */ | |
917f2f10 | 2373 | goto done; /* err = -EADDRNOTAVAIL */ |
1da177e4 | 2374 | |
8cdaaa15 DS |
2375 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2376 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { | |
2377 | leavegroup = 1; | |
2378 | goto done; | |
2379 | } | |
2380 | ||
1da177e4 | 2381 | /* update the interface filter */ |
e905a9ed | 2382 | ip_mc_del_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2383 | &mreqs->imr_sourceaddr, 1); |
2384 | ||
c71151f0 | 2385 | for (j = i+1; j < psl->sl_count; j++) |
1da177e4 LT |
2386 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
2387 | psl->sl_count--; | |
2388 | err = 0; | |
2389 | goto done; | |
2390 | } | |
2391 | /* else, add a new source to the filter */ | |
2392 | ||
6ae0f2e5 | 2393 | if (psl && psl->sl_count >= READ_ONCE(net->ipv4.sysctl_igmp_max_msf)) { |
1da177e4 LT |
2394 | err = -ENOBUFS; |
2395 | goto done; | |
2396 | } | |
2397 | if (!psl || psl->sl_count == psl->sl_max) { | |
2398 | struct ip_sf_socklist *newpsl; | |
2399 | int count = IP_SFBLOCK; | |
2400 | ||
2401 | if (psl) | |
2402 | count += psl->sl_max; | |
e6a1f7e0 GS |
2403 | newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count), |
2404 | GFP_KERNEL); | |
1da177e4 LT |
2405 | if (!newpsl) { |
2406 | err = -ENOBUFS; | |
2407 | goto done; | |
2408 | } | |
2409 | newpsl->sl_max = count; | |
2410 | newpsl->sl_count = count - IP_SFBLOCK; | |
2411 | if (psl) { | |
c71151f0 | 2412 | for (i = 0; i < psl->sl_count; i++) |
1da177e4 | 2413 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
c85bb41e | 2414 | /* decrease mem now to avoid the memleak warning */ |
e6a1f7e0 GS |
2415 | atomic_sub(struct_size(psl, sl_addr, psl->sl_max), |
2416 | &sk->sk_omem_alloc); | |
1da177e4 | 2417 | } |
cf778b00 | 2418 | rcu_assign_pointer(pmc->sflist, newpsl); |
dba5bdd5 ED |
2419 | if (psl) |
2420 | kfree_rcu(psl, rcu); | |
c85bb41e | 2421 | psl = newpsl; |
1da177e4 LT |
2422 | } |
2423 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ | |
c71151f0 | 2424 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 | 2425 | rv = memcmp(&psl->sl_addr[i], &mreqs->imr_sourceaddr, |
63007727 | 2426 | sizeof(__be32)); |
1da177e4 LT |
2427 | if (rv == 0) |
2428 | break; | |
2429 | } | |
2430 | if (rv == 0) /* address already there is an error */ | |
2431 | goto done; | |
c71151f0 | 2432 | for (j = psl->sl_count-1; j >= i; j--) |
1da177e4 LT |
2433 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
2434 | psl->sl_addr[i] = mreqs->imr_sourceaddr; | |
2435 | psl->sl_count++; | |
2436 | err = 0; | |
2437 | /* update the interface list */ | |
e905a9ed | 2438 | ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1, |
1da177e4 LT |
2439 | &mreqs->imr_sourceaddr, 1); |
2440 | done: | |
8cdaaa15 | 2441 | if (leavegroup) |
54ff9ef3 | 2442 | err = ip_mc_leave_group(sk, &imr); |
1da177e4 LT |
2443 | return err; |
2444 | } | |
2445 | ||
2446 | int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex) | |
2447 | { | |
9951f036 | 2448 | int err = 0; |
1da177e4 | 2449 | struct ip_mreqn imr; |
63007727 | 2450 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2451 | struct ip_mc_socklist *pmc; |
2452 | struct in_device *in_dev; | |
2453 | struct inet_sock *inet = inet_sk(sk); | |
2454 | struct ip_sf_socklist *newpsl, *psl; | |
877acedc | 2455 | struct net *net = sock_net(sk); |
9951f036 | 2456 | int leavegroup = 0; |
1da177e4 | 2457 | |
f97c1e0c | 2458 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2459 | return -EINVAL; |
2460 | if (msf->imsf_fmode != MCAST_INCLUDE && | |
2461 | msf->imsf_fmode != MCAST_EXCLUDE) | |
2462 | return -EINVAL; | |
2463 | ||
54ff9ef3 | 2464 | ASSERT_RTNL(); |
1da177e4 LT |
2465 | |
2466 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; | |
2467 | imr.imr_address.s_addr = msf->imsf_interface; | |
2468 | imr.imr_ifindex = ifindex; | |
877acedc | 2469 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2470 | |
2471 | if (!in_dev) { | |
2472 | err = -ENODEV; | |
2473 | goto done; | |
2474 | } | |
1da177e4 | 2475 | |
9951f036 DS |
2476 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
2477 | if (msf->imsf_fmode == MCAST_INCLUDE && msf->imsf_numsrc == 0) { | |
2478 | leavegroup = 1; | |
2479 | goto done; | |
2480 | } | |
2481 | ||
1d7138de | 2482 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2483 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2484 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2485 | break; | |
2486 | } | |
917f2f10 DS |
2487 | if (!pmc) { /* must have a prior join */ |
2488 | err = -EINVAL; | |
1da177e4 | 2489 | goto done; |
917f2f10 | 2490 | } |
1da177e4 | 2491 | if (msf->imsf_numsrc) { |
e6a1f7e0 GS |
2492 | newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, |
2493 | msf->imsf_numsrc), | |
2494 | GFP_KERNEL); | |
1da177e4 LT |
2495 | if (!newpsl) { |
2496 | err = -ENOBUFS; | |
2497 | goto done; | |
2498 | } | |
2499 | newpsl->sl_max = newpsl->sl_count = msf->imsf_numsrc; | |
2d3e5caf GS |
2500 | memcpy(newpsl->sl_addr, msf->imsf_slist_flex, |
2501 | flex_array_size(msf, imsf_slist_flex, msf->imsf_numsrc)); | |
1da177e4 LT |
2502 | err = ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2503 | msf->imsf_fmode, newpsl->sl_count, newpsl->sl_addr, 0); | |
2504 | if (err) { | |
e6a1f7e0 GS |
2505 | sock_kfree_s(sk, newpsl, |
2506 | struct_size(newpsl, sl_addr, | |
2507 | newpsl->sl_max)); | |
1da177e4 LT |
2508 | goto done; |
2509 | } | |
8713dbf0 | 2510 | } else { |
1da177e4 | 2511 | newpsl = NULL; |
8713dbf0 YZ |
2512 | (void) ip_mc_add_src(in_dev, &msf->imsf_multiaddr, |
2513 | msf->imsf_fmode, 0, NULL, 0); | |
2514 | } | |
1d7138de | 2515 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2516 | if (psl) { |
2517 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, | |
2518 | psl->sl_count, psl->sl_addr, 0); | |
c85bb41e | 2519 | /* decrease mem now to avoid the memleak warning */ |
e6a1f7e0 GS |
2520 | atomic_sub(struct_size(psl, sl_addr, psl->sl_max), |
2521 | &sk->sk_omem_alloc); | |
dba5bdd5 | 2522 | } else { |
1da177e4 LT |
2523 | (void) ip_mc_del_src(in_dev, &msf->imsf_multiaddr, pmc->sfmode, |
2524 | 0, NULL, 0); | |
dba5bdd5 | 2525 | } |
cf778b00 | 2526 | rcu_assign_pointer(pmc->sflist, newpsl); |
dba5bdd5 ED |
2527 | if (psl) |
2528 | kfree_rcu(psl, rcu); | |
1da177e4 | 2529 | pmc->sfmode = msf->imsf_fmode; |
917f2f10 | 2530 | err = 0; |
1da177e4 | 2531 | done: |
9951f036 DS |
2532 | if (leavegroup) |
2533 | err = ip_mc_leave_group(sk, &imr); | |
1da177e4 LT |
2534 | return err; |
2535 | } | |
1da177e4 | 2536 | int ip_mc_msfget(struct sock *sk, struct ip_msfilter *msf, |
728f064c | 2537 | sockptr_t optval, sockptr_t optlen) |
1da177e4 | 2538 | { |
728f064c | 2539 | int err, len, count, copycount, msf_size; |
1da177e4 | 2540 | struct ip_mreqn imr; |
63007727 | 2541 | __be32 addr = msf->imsf_multiaddr; |
1da177e4 LT |
2542 | struct ip_mc_socklist *pmc; |
2543 | struct in_device *in_dev; | |
2544 | struct inet_sock *inet = inet_sk(sk); | |
2545 | struct ip_sf_socklist *psl; | |
877acedc | 2546 | struct net *net = sock_net(sk); |
1da177e4 | 2547 | |
87e9f031 WC |
2548 | ASSERT_RTNL(); |
2549 | ||
f97c1e0c | 2550 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2551 | return -EINVAL; |
2552 | ||
1da177e4 LT |
2553 | imr.imr_multiaddr.s_addr = msf->imsf_multiaddr; |
2554 | imr.imr_address.s_addr = msf->imsf_interface; | |
2555 | imr.imr_ifindex = 0; | |
877acedc | 2556 | in_dev = ip_mc_find_dev(net, &imr); |
1da177e4 LT |
2557 | |
2558 | if (!in_dev) { | |
2559 | err = -ENODEV; | |
2560 | goto done; | |
2561 | } | |
2562 | err = -EADDRNOTAVAIL; | |
2563 | ||
1d7138de | 2564 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2565 | if (pmc->multi.imr_multiaddr.s_addr == msf->imsf_multiaddr && |
2566 | pmc->multi.imr_ifindex == imr.imr_ifindex) | |
2567 | break; | |
2568 | } | |
2569 | if (!pmc) /* must have a prior join */ | |
2570 | goto done; | |
2571 | msf->imsf_fmode = pmc->sfmode; | |
1d7138de | 2572 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 | 2573 | if (!psl) { |
1da177e4 LT |
2574 | count = 0; |
2575 | } else { | |
2576 | count = psl->sl_count; | |
2577 | } | |
2578 | copycount = count < msf->imsf_numsrc ? count : msf->imsf_numsrc; | |
2d3e5caf | 2579 | len = flex_array_size(psl, sl_addr, copycount); |
1da177e4 | 2580 | msf->imsf_numsrc = count; |
728f064c MKL |
2581 | msf_size = IP_MSFILTER_SIZE(copycount); |
2582 | if (copy_to_sockptr(optlen, &msf_size, sizeof(int)) || | |
2583 | copy_to_sockptr(optval, msf, IP_MSFILTER_SIZE(0))) { | |
1da177e4 LT |
2584 | return -EFAULT; |
2585 | } | |
2586 | if (len && | |
728f064c MKL |
2587 | copy_to_sockptr_offset(optval, |
2588 | offsetof(struct ip_msfilter, imsf_slist_flex), | |
2589 | psl->sl_addr, len)) | |
1da177e4 LT |
2590 | return -EFAULT; |
2591 | return 0; | |
2592 | done: | |
1da177e4 LT |
2593 | return err; |
2594 | } | |
2595 | ||
2596 | int ip_mc_gsfget(struct sock *sk, struct group_filter *gsf, | |
728f064c | 2597 | sockptr_t optval, size_t ss_offset) |
1da177e4 | 2598 | { |
931ca7ab | 2599 | int i, count, copycount; |
1da177e4 | 2600 | struct sockaddr_in *psin; |
63007727 | 2601 | __be32 addr; |
1da177e4 LT |
2602 | struct ip_mc_socklist *pmc; |
2603 | struct inet_sock *inet = inet_sk(sk); | |
2604 | struct ip_sf_socklist *psl; | |
2605 | ||
87e9f031 WC |
2606 | ASSERT_RTNL(); |
2607 | ||
1da177e4 LT |
2608 | psin = (struct sockaddr_in *)&gsf->gf_group; |
2609 | if (psin->sin_family != AF_INET) | |
2610 | return -EINVAL; | |
2611 | addr = psin->sin_addr.s_addr; | |
f97c1e0c | 2612 | if (!ipv4_is_multicast(addr)) |
1da177e4 LT |
2613 | return -EINVAL; |
2614 | ||
1d7138de | 2615 | for_each_pmc_rtnl(inet, pmc) { |
1da177e4 LT |
2616 | if (pmc->multi.imr_multiaddr.s_addr == addr && |
2617 | pmc->multi.imr_ifindex == gsf->gf_interface) | |
2618 | break; | |
2619 | } | |
2620 | if (!pmc) /* must have a prior join */ | |
931ca7ab | 2621 | return -EADDRNOTAVAIL; |
1da177e4 | 2622 | gsf->gf_fmode = pmc->sfmode; |
1d7138de | 2623 | psl = rtnl_dereference(pmc->sflist); |
1da177e4 LT |
2624 | count = psl ? psl->sl_count : 0; |
2625 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; | |
2626 | gsf->gf_numsrc = count; | |
728f064c | 2627 | for (i = 0; i < copycount; i++) { |
1da177e4 LT |
2628 | struct sockaddr_storage ss; |
2629 | ||
2630 | psin = (struct sockaddr_in *)&ss; | |
2631 | memset(&ss, 0, sizeof(ss)); | |
2632 | psin->sin_family = AF_INET; | |
2633 | psin->sin_addr.s_addr = psl->sl_addr[i]; | |
728f064c MKL |
2634 | if (copy_to_sockptr_offset(optval, ss_offset, |
2635 | &ss, sizeof(ss))) | |
1da177e4 | 2636 | return -EFAULT; |
728f064c | 2637 | ss_offset += sizeof(ss); |
1da177e4 LT |
2638 | } |
2639 | return 0; | |
1da177e4 LT |
2640 | } |
2641 | ||
2642 | /* | |
2643 | * check if a multicast source filter allows delivery for a given <src,dst,intf> | |
2644 | */ | |
33e972bd | 2645 | int ip_mc_sf_allow(const struct sock *sk, __be32 loc_addr, __be32 rmt_addr, |
60d9b031 | 2646 | int dif, int sdif) |
1da177e4 | 2647 | { |
33e972bd | 2648 | const struct inet_sock *inet = inet_sk(sk); |
1da177e4 LT |
2649 | struct ip_mc_socklist *pmc; |
2650 | struct ip_sf_socklist *psl; | |
2651 | int i; | |
c85bb41e | 2652 | int ret; |
1da177e4 | 2653 | |
c85bb41e | 2654 | ret = 1; |
f97c1e0c | 2655 | if (!ipv4_is_multicast(loc_addr)) |
c85bb41e | 2656 | goto out; |
1da177e4 | 2657 | |
c85bb41e | 2658 | rcu_read_lock(); |
1d7138de | 2659 | for_each_pmc_rcu(inet, pmc) { |
1da177e4 | 2660 | if (pmc->multi.imr_multiaddr.s_addr == loc_addr && |
60d9b031 DA |
2661 | (pmc->multi.imr_ifindex == dif || |
2662 | (sdif && pmc->multi.imr_ifindex == sdif))) | |
1da177e4 LT |
2663 | break; |
2664 | } | |
307b4ac6 | 2665 | ret = inet_test_bit(MC_ALL, sk); |
1da177e4 | 2666 | if (!pmc) |
c85bb41e | 2667 | goto unlock; |
1d7138de | 2668 | psl = rcu_dereference(pmc->sflist); |
c85bb41e | 2669 | ret = (pmc->sfmode == MCAST_EXCLUDE); |
1da177e4 | 2670 | if (!psl) |
c85bb41e | 2671 | goto unlock; |
1da177e4 | 2672 | |
c71151f0 | 2673 | for (i = 0; i < psl->sl_count; i++) { |
1da177e4 LT |
2674 | if (psl->sl_addr[i] == rmt_addr) |
2675 | break; | |
2676 | } | |
c85bb41e | 2677 | ret = 0; |
1da177e4 | 2678 | if (pmc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
c85bb41e | 2679 | goto unlock; |
1da177e4 | 2680 | if (pmc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
c85bb41e FL |
2681 | goto unlock; |
2682 | ret = 1; | |
2683 | unlock: | |
2684 | rcu_read_unlock(); | |
2685 | out: | |
2686 | return ret; | |
1da177e4 LT |
2687 | } |
2688 | ||
2689 | /* | |
2690 | * A socket is closing. | |
2691 | */ | |
2692 | ||
2693 | void ip_mc_drop_socket(struct sock *sk) | |
2694 | { | |
2695 | struct inet_sock *inet = inet_sk(sk); | |
2696 | struct ip_mc_socklist *iml; | |
877acedc | 2697 | struct net *net = sock_net(sk); |
1da177e4 | 2698 | |
51456b29 | 2699 | if (!inet->mc_list) |
1da177e4 LT |
2700 | return; |
2701 | ||
2702 | rtnl_lock(); | |
1d7138de | 2703 | while ((iml = rtnl_dereference(inet->mc_list)) != NULL) { |
1da177e4 | 2704 | struct in_device *in_dev; |
1da177e4 | 2705 | |
1d7138de | 2706 | inet->mc_list = iml->next_rcu; |
877acedc | 2707 | in_dev = inetdev_by_index(net, iml->multi.imr_ifindex); |
bb699cbc | 2708 | (void) ip_mc_leave_src(sk, iml, in_dev); |
00db4124 | 2709 | if (in_dev) |
1da177e4 | 2710 | ip_mc_dec_group(in_dev, iml->multi.imr_multiaddr.s_addr); |
c85bb41e FL |
2711 | /* decrease mem now to avoid the memleak warning */ |
2712 | atomic_sub(sizeof(*iml), &sk->sk_omem_alloc); | |
10d50e74 | 2713 | kfree_rcu(iml, rcu); |
1da177e4 LT |
2714 | } |
2715 | rtnl_unlock(); | |
2716 | } | |
2717 | ||
dbdd9a52 | 2718 | /* called with rcu_read_lock() */ |
2094acbb | 2719 | int ip_check_mc_rcu(struct in_device *in_dev, __be32 mc_addr, __be32 src_addr, u8 proto) |
1da177e4 LT |
2720 | { |
2721 | struct ip_mc_list *im; | |
e9897071 | 2722 | struct ip_mc_list __rcu **mc_hash; |
1da177e4 LT |
2723 | struct ip_sf_list *psf; |
2724 | int rv = 0; | |
2725 | ||
e9897071 ED |
2726 | mc_hash = rcu_dereference(in_dev->mc_hash); |
2727 | if (mc_hash) { | |
c70eba74 | 2728 | u32 hash = hash_32((__force u32)mc_addr, MC_HASH_SZ_LOG); |
e9897071 ED |
2729 | |
2730 | for (im = rcu_dereference(mc_hash[hash]); | |
2731 | im != NULL; | |
2732 | im = rcu_dereference(im->next_hash)) { | |
2733 | if (im->multiaddr == mc_addr) | |
2734 | break; | |
2735 | } | |
2736 | } else { | |
2737 | for_each_pmc_rcu(in_dev, im) { | |
2738 | if (im->multiaddr == mc_addr) | |
2739 | break; | |
2740 | } | |
1da177e4 LT |
2741 | } |
2742 | if (im && proto == IPPROTO_IGMP) { | |
2743 | rv = 1; | |
2744 | } else if (im) { | |
2745 | if (src_addr) { | |
23d2b940 | 2746 | spin_lock_bh(&im->lock); |
c71151f0 | 2747 | for (psf = im->sources; psf; psf = psf->sf_next) { |
1da177e4 LT |
2748 | if (psf->sf_inaddr == src_addr) |
2749 | break; | |
2750 | } | |
2751 | if (psf) | |
2752 | rv = psf->sf_count[MCAST_INCLUDE] || | |
2753 | psf->sf_count[MCAST_EXCLUDE] != | |
2754 | im->sfcount[MCAST_EXCLUDE]; | |
2755 | else | |
2756 | rv = im->sfcount[MCAST_EXCLUDE] != 0; | |
23d2b940 | 2757 | spin_unlock_bh(&im->lock); |
1da177e4 LT |
2758 | } else |
2759 | rv = 1; /* unspecified source; tentatively allow */ | |
2760 | } | |
1da177e4 LT |
2761 | return rv; |
2762 | } | |
2763 | ||
2764 | #if defined(CONFIG_PROC_FS) | |
2765 | struct igmp_mc_iter_state { | |
7091e728 | 2766 | struct seq_net_private p; |
1da177e4 LT |
2767 | struct net_device *dev; |
2768 | struct in_device *in_dev; | |
2769 | }; | |
2770 | ||
2771 | #define igmp_mc_seq_private(seq) ((struct igmp_mc_iter_state *)(seq)->private) | |
2772 | ||
2773 | static inline struct ip_mc_list *igmp_mc_get_first(struct seq_file *seq) | |
2774 | { | |
7091e728 | 2775 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2776 | struct ip_mc_list *im = NULL; |
2777 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
2778 | ||
7562f876 | 2779 | state->in_dev = NULL; |
61fbab77 | 2780 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2781 | struct in_device *in_dev; |
6baff150 ED |
2782 | |
2783 | in_dev = __in_dev_get_rcu(state->dev); | |
1da177e4 LT |
2784 | if (!in_dev) |
2785 | continue; | |
1d7138de | 2786 | im = rcu_dereference(in_dev->mc_list); |
1da177e4 LT |
2787 | if (im) { |
2788 | state->in_dev = in_dev; | |
2789 | break; | |
2790 | } | |
1da177e4 LT |
2791 | } |
2792 | return im; | |
2793 | } | |
2794 | ||
2795 | static struct ip_mc_list *igmp_mc_get_next(struct seq_file *seq, struct ip_mc_list *im) | |
2796 | { | |
2797 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
6baff150 | 2798 | |
1d7138de ED |
2799 | im = rcu_dereference(im->next_rcu); |
2800 | while (!im) { | |
6baff150 | 2801 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2802 | if (!state->dev) { |
2803 | state->in_dev = NULL; | |
2804 | break; | |
2805 | } | |
6baff150 | 2806 | state->in_dev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2807 | if (!state->in_dev) |
2808 | continue; | |
1d7138de | 2809 | im = rcu_dereference(state->in_dev->mc_list); |
1da177e4 LT |
2810 | } |
2811 | return im; | |
2812 | } | |
2813 | ||
2814 | static struct ip_mc_list *igmp_mc_get_idx(struct seq_file *seq, loff_t pos) | |
2815 | { | |
2816 | struct ip_mc_list *im = igmp_mc_get_first(seq); | |
2817 | if (im) | |
2818 | while (pos && (im = igmp_mc_get_next(seq, im)) != NULL) | |
2819 | --pos; | |
2820 | return pos ? NULL : im; | |
2821 | } | |
2822 | ||
2823 | static void *igmp_mc_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2824 | __acquires(rcu) |
1da177e4 | 2825 | { |
61fbab77 | 2826 | rcu_read_lock(); |
1da177e4 LT |
2827 | return *pos ? igmp_mc_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2828 | } | |
2829 | ||
2830 | static void *igmp_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2831 | { | |
2832 | struct ip_mc_list *im; | |
2833 | if (v == SEQ_START_TOKEN) | |
2834 | im = igmp_mc_get_first(seq); | |
2835 | else | |
2836 | im = igmp_mc_get_next(seq, v); | |
2837 | ++*pos; | |
2838 | return im; | |
2839 | } | |
2840 | ||
2841 | static void igmp_mc_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2842 | __releases(rcu) |
1da177e4 LT |
2843 | { |
2844 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); | |
1d7138de ED |
2845 | |
2846 | state->in_dev = NULL; | |
1da177e4 | 2847 | state->dev = NULL; |
61fbab77 | 2848 | rcu_read_unlock(); |
1da177e4 LT |
2849 | } |
2850 | ||
2851 | static int igmp_mc_seq_show(struct seq_file *seq, void *v) | |
2852 | { | |
2853 | if (v == SEQ_START_TOKEN) | |
e905a9ed | 2854 | seq_puts(seq, |
1da177e4 LT |
2855 | "Idx\tDevice : Count Querier\tGroup Users Timer\tReporter\n"); |
2856 | else { | |
2e47eece | 2857 | struct ip_mc_list *im = v; |
1da177e4 LT |
2858 | struct igmp_mc_iter_state *state = igmp_mc_seq_private(seq); |
2859 | char *querier; | |
a399a805 ED |
2860 | long delta; |
2861 | ||
1da177e4 LT |
2862 | #ifdef CONFIG_IP_MULTICAST |
2863 | querier = IGMP_V1_SEEN(state->in_dev) ? "V1" : | |
2864 | IGMP_V2_SEEN(state->in_dev) ? "V2" : | |
2865 | "V3"; | |
2866 | #else | |
2867 | querier = "NONE"; | |
2868 | #endif | |
2869 | ||
e6b68883 | 2870 | if (rcu_access_pointer(state->in_dev->mc_list) == im) { |
1da177e4 | 2871 | seq_printf(seq, "%d\t%-10s: %5d %7s\n", |
b8bae41e | 2872 | state->dev->ifindex, state->dev->name, state->in_dev->mc_count, querier); |
1da177e4 LT |
2873 | } |
2874 | ||
a399a805 | 2875 | delta = im->timer.expires - jiffies; |
1da177e4 | 2876 | seq_printf(seq, |
338fcf98 | 2877 | "\t\t\t\t%08X %5d %d:%08lX\t\t%d\n", |
1da177e4 | 2878 | im->multiaddr, im->users, |
a399a805 ED |
2879 | im->tm_running, |
2880 | im->tm_running ? jiffies_delta_to_clock_t(delta) : 0, | |
1da177e4 LT |
2881 | im->reporter); |
2882 | } | |
2883 | return 0; | |
2884 | } | |
2885 | ||
f690808e | 2886 | static const struct seq_operations igmp_mc_seq_ops = { |
1da177e4 LT |
2887 | .start = igmp_mc_seq_start, |
2888 | .next = igmp_mc_seq_next, | |
2889 | .stop = igmp_mc_seq_stop, | |
2890 | .show = igmp_mc_seq_show, | |
2891 | }; | |
2892 | ||
1da177e4 | 2893 | struct igmp_mcf_iter_state { |
7091e728 | 2894 | struct seq_net_private p; |
1da177e4 LT |
2895 | struct net_device *dev; |
2896 | struct in_device *idev; | |
2897 | struct ip_mc_list *im; | |
2898 | }; | |
2899 | ||
2900 | #define igmp_mcf_seq_private(seq) ((struct igmp_mcf_iter_state *)(seq)->private) | |
2901 | ||
2902 | static inline struct ip_sf_list *igmp_mcf_get_first(struct seq_file *seq) | |
2903 | { | |
7091e728 | 2904 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2905 | struct ip_sf_list *psf = NULL; |
2906 | struct ip_mc_list *im = NULL; | |
2907 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2908 | ||
7562f876 PE |
2909 | state->idev = NULL; |
2910 | state->im = NULL; | |
61fbab77 | 2911 | for_each_netdev_rcu(net, state->dev) { |
1da177e4 | 2912 | struct in_device *idev; |
6baff150 | 2913 | idev = __in_dev_get_rcu(state->dev); |
51456b29 | 2914 | if (unlikely(!idev)) |
1da177e4 | 2915 | continue; |
1d7138de | 2916 | im = rcu_dereference(idev->mc_list); |
00db4124 | 2917 | if (likely(im)) { |
1da177e4 LT |
2918 | spin_lock_bh(&im->lock); |
2919 | psf = im->sources; | |
00db4124 | 2920 | if (likely(psf)) { |
1da177e4 LT |
2921 | state->im = im; |
2922 | state->idev = idev; | |
2923 | break; | |
2924 | } | |
2925 | spin_unlock_bh(&im->lock); | |
2926 | } | |
1da177e4 LT |
2927 | } |
2928 | return psf; | |
2929 | } | |
2930 | ||
2931 | static struct ip_sf_list *igmp_mcf_get_next(struct seq_file *seq, struct ip_sf_list *psf) | |
2932 | { | |
2933 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
2934 | ||
2935 | psf = psf->sf_next; | |
2936 | while (!psf) { | |
2937 | spin_unlock_bh(&state->im->lock); | |
2938 | state->im = state->im->next; | |
2939 | while (!state->im) { | |
6baff150 | 2940 | state->dev = next_net_device_rcu(state->dev); |
1da177e4 LT |
2941 | if (!state->dev) { |
2942 | state->idev = NULL; | |
2943 | goto out; | |
2944 | } | |
6baff150 | 2945 | state->idev = __in_dev_get_rcu(state->dev); |
1da177e4 LT |
2946 | if (!state->idev) |
2947 | continue; | |
1d7138de | 2948 | state->im = rcu_dereference(state->idev->mc_list); |
1da177e4 | 2949 | } |
1da177e4 LT |
2950 | spin_lock_bh(&state->im->lock); |
2951 | psf = state->im->sources; | |
2952 | } | |
2953 | out: | |
2954 | return psf; | |
2955 | } | |
2956 | ||
2957 | static struct ip_sf_list *igmp_mcf_get_idx(struct seq_file *seq, loff_t pos) | |
2958 | { | |
2959 | struct ip_sf_list *psf = igmp_mcf_get_first(seq); | |
2960 | if (psf) | |
2961 | while (pos && (psf = igmp_mcf_get_next(seq, psf)) != NULL) | |
2962 | --pos; | |
2963 | return pos ? NULL : psf; | |
2964 | } | |
2965 | ||
2966 | static void *igmp_mcf_seq_start(struct seq_file *seq, loff_t *pos) | |
61fbab77 | 2967 | __acquires(rcu) |
1da177e4 | 2968 | { |
61fbab77 | 2969 | rcu_read_lock(); |
1da177e4 LT |
2970 | return *pos ? igmp_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
2971 | } | |
2972 | ||
2973 | static void *igmp_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2974 | { | |
2975 | struct ip_sf_list *psf; | |
2976 | if (v == SEQ_START_TOKEN) | |
2977 | psf = igmp_mcf_get_first(seq); | |
2978 | else | |
2979 | psf = igmp_mcf_get_next(seq, v); | |
2980 | ++*pos; | |
2981 | return psf; | |
2982 | } | |
2983 | ||
2984 | static void igmp_mcf_seq_stop(struct seq_file *seq, void *v) | |
61fbab77 | 2985 | __releases(rcu) |
1da177e4 LT |
2986 | { |
2987 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); | |
00db4124 | 2988 | if (likely(state->im)) { |
1da177e4 LT |
2989 | spin_unlock_bh(&state->im->lock); |
2990 | state->im = NULL; | |
2991 | } | |
1d7138de | 2992 | state->idev = NULL; |
1da177e4 | 2993 | state->dev = NULL; |
61fbab77 | 2994 | rcu_read_unlock(); |
1da177e4 LT |
2995 | } |
2996 | ||
2997 | static int igmp_mcf_seq_show(struct seq_file *seq, void *v) | |
2998 | { | |
2e47eece | 2999 | struct ip_sf_list *psf = v; |
1da177e4 LT |
3000 | struct igmp_mcf_iter_state *state = igmp_mcf_seq_private(seq); |
3001 | ||
3002 | if (v == SEQ_START_TOKEN) { | |
1744bea1 | 3003 | seq_puts(seq, "Idx Device MCA SRC INC EXC\n"); |
1da177e4 LT |
3004 | } else { |
3005 | seq_printf(seq, | |
3006 | "%3d %6.6s 0x%08x " | |
e905a9ed YH |
3007 | "0x%08x %6lu %6lu\n", |
3008 | state->dev->ifindex, state->dev->name, | |
1da177e4 LT |
3009 | ntohl(state->im->multiaddr), |
3010 | ntohl(psf->sf_inaddr), | |
3011 | psf->sf_count[MCAST_INCLUDE], | |
3012 | psf->sf_count[MCAST_EXCLUDE]); | |
3013 | } | |
3014 | return 0; | |
3015 | } | |
3016 | ||
f690808e | 3017 | static const struct seq_operations igmp_mcf_seq_ops = { |
1da177e4 LT |
3018 | .start = igmp_mcf_seq_start, |
3019 | .next = igmp_mcf_seq_next, | |
3020 | .stop = igmp_mcf_seq_stop, | |
3021 | .show = igmp_mcf_seq_show, | |
3022 | }; | |
3023 | ||
2c8c1e72 | 3024 | static int __net_init igmp_net_init(struct net *net) |
1da177e4 | 3025 | { |
7091e728 | 3026 | struct proc_dir_entry *pde; |
93a714d6 | 3027 | int err; |
7091e728 | 3028 | |
c3506372 CH |
3029 | pde = proc_create_net("igmp", 0444, net->proc_net, &igmp_mc_seq_ops, |
3030 | sizeof(struct igmp_mc_iter_state)); | |
7091e728 AD |
3031 | if (!pde) |
3032 | goto out_igmp; | |
c3506372 CH |
3033 | pde = proc_create_net("mcfilter", 0444, net->proc_net, |
3034 | &igmp_mcf_seq_ops, sizeof(struct igmp_mcf_iter_state)); | |
7091e728 AD |
3035 | if (!pde) |
3036 | goto out_mcfilter; | |
93a714d6 MC |
3037 | err = inet_ctl_sock_create(&net->ipv4.mc_autojoin_sk, AF_INET, |
3038 | SOCK_DGRAM, 0, net); | |
3039 | if (err < 0) { | |
3040 | pr_err("Failed to initialize the IGMP autojoin socket (err %d)\n", | |
3041 | err); | |
3042 | goto out_sock; | |
3043 | } | |
3044 | ||
1da177e4 | 3045 | return 0; |
7091e728 | 3046 | |
93a714d6 MC |
3047 | out_sock: |
3048 | remove_proc_entry("mcfilter", net->proc_net); | |
7091e728 | 3049 | out_mcfilter: |
ece31ffd | 3050 | remove_proc_entry("igmp", net->proc_net); |
7091e728 AD |
3051 | out_igmp: |
3052 | return -ENOMEM; | |
3053 | } | |
3054 | ||
2c8c1e72 | 3055 | static void __net_exit igmp_net_exit(struct net *net) |
7091e728 | 3056 | { |
ece31ffd G |
3057 | remove_proc_entry("mcfilter", net->proc_net); |
3058 | remove_proc_entry("igmp", net->proc_net); | |
93a714d6 | 3059 | inet_ctl_sock_destroy(net->ipv4.mc_autojoin_sk); |
7091e728 AD |
3060 | } |
3061 | ||
3062 | static struct pernet_operations igmp_net_ops = { | |
3063 | .init = igmp_net_init, | |
3064 | .exit = igmp_net_exit, | |
3065 | }; | |
72c1d3bd | 3066 | #endif |
7091e728 | 3067 | |
4aa5dee4 JP |
3068 | static int igmp_netdev_event(struct notifier_block *this, |
3069 | unsigned long event, void *ptr) | |
3070 | { | |
3071 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); | |
3072 | struct in_device *in_dev; | |
3073 | ||
3074 | switch (event) { | |
3075 | case NETDEV_RESEND_IGMP: | |
3076 | in_dev = __in_dev_get_rtnl(dev); | |
3077 | if (in_dev) | |
3078 | ip_mc_rejoin_groups(in_dev); | |
3079 | break; | |
3080 | default: | |
3081 | break; | |
3082 | } | |
3083 | return NOTIFY_DONE; | |
3084 | } | |
3085 | ||
3086 | static struct notifier_block igmp_notifier = { | |
3087 | .notifier_call = igmp_netdev_event, | |
3088 | }; | |
3089 | ||
72c1d3bd | 3090 | int __init igmp_mc_init(void) |
7091e728 | 3091 | { |
72c1d3bd | 3092 | #if defined(CONFIG_PROC_FS) |
4aa5dee4 JP |
3093 | int err; |
3094 | ||
3095 | err = register_pernet_subsys(&igmp_net_ops); | |
3096 | if (err) | |
3097 | return err; | |
3098 | err = register_netdevice_notifier(&igmp_notifier); | |
3099 | if (err) | |
3100 | goto reg_notif_fail; | |
3101 | return 0; | |
3102 | ||
3103 | reg_notif_fail: | |
3104 | unregister_pernet_subsys(&igmp_net_ops); | |
3105 | return err; | |
72c1d3bd WC |
3106 | #else |
3107 | return register_netdevice_notifier(&igmp_notifier); | |
1da177e4 | 3108 | #endif |
72c1d3bd | 3109 | } |