Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Multicast support for IPv6 |
| 3 | * Linux INET6 implementation |
| 4 | * |
| 5 | * Authors: |
| 6 | * Pedro Roque <roque@di.fc.ul.pt> |
| 7 | * |
| 8 | * $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $ |
| 9 | * |
| 10 | * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or |
| 13 | * modify it under the terms of the GNU General Public License |
| 14 | * as published by the Free Software Foundation; either version |
| 15 | * 2 of the License, or (at your option) any later version. |
| 16 | */ |
| 17 | |
| 18 | /* Changes: |
| 19 | * |
| 20 | * yoshfuji : fix format of router-alert option |
| 21 | * YOSHIFUJI Hideaki @USAGI: |
| 22 | * Fixed source address for MLD message based on |
| 23 | * <draft-ietf-magma-mld-source-05.txt>. |
| 24 | * YOSHIFUJI Hideaki @USAGI: |
| 25 | * - Ignore Queries for invalid addresses. |
| 26 | * - MLD for link-local addresses. |
| 27 | * David L Stevens <dlstevens@us.ibm.com>: |
| 28 | * - MLDv2 support |
| 29 | */ |
| 30 | |
| 31 | #include <linux/config.h> |
| 32 | #include <linux/module.h> |
| 33 | #include <linux/errno.h> |
| 34 | #include <linux/types.h> |
| 35 | #include <linux/string.h> |
| 36 | #include <linux/socket.h> |
| 37 | #include <linux/sockios.h> |
| 38 | #include <linux/jiffies.h> |
| 39 | #include <linux/times.h> |
| 40 | #include <linux/net.h> |
| 41 | #include <linux/in.h> |
| 42 | #include <linux/in6.h> |
| 43 | #include <linux/netdevice.h> |
| 44 | #include <linux/if_arp.h> |
| 45 | #include <linux/route.h> |
| 46 | #include <linux/init.h> |
| 47 | #include <linux/proc_fs.h> |
| 48 | #include <linux/seq_file.h> |
| 49 | |
| 50 | #include <linux/netfilter.h> |
| 51 | #include <linux/netfilter_ipv6.h> |
| 52 | |
| 53 | #include <net/sock.h> |
| 54 | #include <net/snmp.h> |
| 55 | |
| 56 | #include <net/ipv6.h> |
| 57 | #include <net/protocol.h> |
| 58 | #include <net/if_inet6.h> |
| 59 | #include <net/ndisc.h> |
| 60 | #include <net/addrconf.h> |
| 61 | #include <net/ip6_route.h> |
| 62 | |
| 63 | #include <net/ip6_checksum.h> |
| 64 | |
| 65 | /* Set to 3 to get tracing... */ |
| 66 | #define MCAST_DEBUG 2 |
| 67 | |
| 68 | #if MCAST_DEBUG >= 3 |
| 69 | #define MDBG(x) printk x |
| 70 | #else |
| 71 | #define MDBG(x) |
| 72 | #endif |
| 73 | |
| 74 | /* |
| 75 | * These header formats should be in a separate include file, but icmpv6.h |
| 76 | * doesn't have in6_addr defined in all cases, there is no __u128, and no |
| 77 | * other files reference these. |
| 78 | * |
| 79 | * +-DLS 4/14/03 |
| 80 | */ |
| 81 | |
| 82 | /* Multicast Listener Discovery version 2 headers */ |
| 83 | |
| 84 | struct mld2_grec { |
| 85 | __u8 grec_type; |
| 86 | __u8 grec_auxwords; |
| 87 | __u16 grec_nsrcs; |
| 88 | struct in6_addr grec_mca; |
| 89 | struct in6_addr grec_src[0]; |
| 90 | }; |
| 91 | |
| 92 | struct mld2_report { |
| 93 | __u8 type; |
| 94 | __u8 resv1; |
| 95 | __u16 csum; |
| 96 | __u16 resv2; |
| 97 | __u16 ngrec; |
| 98 | struct mld2_grec grec[0]; |
| 99 | }; |
| 100 | |
| 101 | struct mld2_query { |
| 102 | __u8 type; |
| 103 | __u8 code; |
| 104 | __u16 csum; |
| 105 | __u16 mrc; |
| 106 | __u16 resv1; |
| 107 | struct in6_addr mca; |
| 108 | #if defined(__LITTLE_ENDIAN_BITFIELD) |
| 109 | __u8 qrv:3, |
| 110 | suppress:1, |
| 111 | resv2:4; |
| 112 | #elif defined(__BIG_ENDIAN_BITFIELD) |
| 113 | __u8 resv2:4, |
| 114 | suppress:1, |
| 115 | qrv:3; |
| 116 | #else |
| 117 | #error "Please fix <asm/byteorder.h>" |
| 118 | #endif |
| 119 | __u8 qqic; |
| 120 | __u16 nsrcs; |
| 121 | struct in6_addr srcs[0]; |
| 122 | }; |
| 123 | |
| 124 | static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; |
| 125 | |
| 126 | /* Big mc list lock for all the sockets */ |
| 127 | static DEFINE_RWLOCK(ipv6_sk_mc_lock); |
| 128 | |
| 129 | static struct socket *igmp6_socket; |
| 130 | |
| 131 | int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr); |
| 132 | |
| 133 | static void igmp6_join_group(struct ifmcaddr6 *ma); |
| 134 | static void igmp6_leave_group(struct ifmcaddr6 *ma); |
| 135 | static void igmp6_timer_handler(unsigned long data); |
| 136 | |
| 137 | static void mld_gq_timer_expire(unsigned long data); |
| 138 | static void mld_ifc_timer_expire(unsigned long data); |
| 139 | static void mld_ifc_event(struct inet6_dev *idev); |
| 140 | static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); |
| 141 | static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr); |
| 142 | static void mld_clear_delrec(struct inet6_dev *idev); |
| 143 | static int sf_setstate(struct ifmcaddr6 *pmc); |
| 144 | static void sf_markstate(struct ifmcaddr6 *pmc); |
| 145 | static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); |
| 146 | static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, |
| 147 | int sfmode, int sfcount, struct in6_addr *psfsrc, |
| 148 | int delta); |
| 149 | static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, |
| 150 | int sfmode, int sfcount, struct in6_addr *psfsrc, |
| 151 | int delta); |
| 152 | static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, |
| 153 | struct inet6_dev *idev); |
| 154 | |
| 155 | |
| 156 | #define IGMP6_UNSOLICITED_IVAL (10*HZ) |
| 157 | #define MLD_QRV_DEFAULT 2 |
| 158 | |
| 159 | #define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \ |
| 160 | (idev)->cnf.force_mld_version == 1 || \ |
| 161 | ((idev)->mc_v1_seen && \ |
| 162 | time_before(jiffies, (idev)->mc_v1_seen))) |
| 163 | |
| 164 | #define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) |
| 165 | #define MLDV2_EXP(thresh, nbmant, nbexp, value) \ |
| 166 | ((value) < (thresh) ? (value) : \ |
| 167 | ((MLDV2_MASK(value, nbmant) | (1<<(nbmant+nbexp))) << \ |
| 168 | (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp)))) |
| 169 | |
| 170 | #define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value) |
| 171 | #define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value) |
| 172 | |
| 173 | #define IPV6_MLD_MAX_MSF 10 |
| 174 | |
| 175 | int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF; |
| 176 | |
| 177 | /* |
| 178 | * socket join on multicast group |
| 179 | */ |
| 180 | |
| 181 | int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr) |
| 182 | { |
| 183 | struct net_device *dev = NULL; |
| 184 | struct ipv6_mc_socklist *mc_lst; |
| 185 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 186 | int err; |
| 187 | |
| 188 | if (!ipv6_addr_is_multicast(addr)) |
| 189 | return -EINVAL; |
| 190 | |
David L Stevens | c9e3e8b | 2005-06-21 13:58:25 -0700 | [diff] [blame] | 191 | read_lock_bh(&ipv6_sk_mc_lock); |
| 192 | for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) { |
| 193 | if ((ifindex == 0 || mc_lst->ifindex == ifindex) && |
| 194 | ipv6_addr_equal(&mc_lst->addr, addr)) { |
| 195 | read_unlock_bh(&ipv6_sk_mc_lock); |
| 196 | return -EADDRINUSE; |
| 197 | } |
| 198 | } |
| 199 | read_unlock_bh(&ipv6_sk_mc_lock); |
| 200 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); |
| 202 | |
| 203 | if (mc_lst == NULL) |
| 204 | return -ENOMEM; |
| 205 | |
| 206 | mc_lst->next = NULL; |
| 207 | ipv6_addr_copy(&mc_lst->addr, addr); |
| 208 | |
| 209 | if (ifindex == 0) { |
| 210 | struct rt6_info *rt; |
| 211 | rt = rt6_lookup(addr, NULL, 0, 0); |
| 212 | if (rt) { |
| 213 | dev = rt->rt6i_dev; |
| 214 | dev_hold(dev); |
| 215 | dst_release(&rt->u.dst); |
| 216 | } |
| 217 | } else |
| 218 | dev = dev_get_by_index(ifindex); |
| 219 | |
| 220 | if (dev == NULL) { |
| 221 | sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); |
| 222 | return -ENODEV; |
| 223 | } |
| 224 | |
| 225 | mc_lst->ifindex = dev->ifindex; |
| 226 | mc_lst->sfmode = MCAST_EXCLUDE; |
| 227 | mc_lst->sflist = NULL; |
| 228 | |
| 229 | /* |
| 230 | * now add/increase the group membership on the device |
| 231 | */ |
| 232 | |
| 233 | err = ipv6_dev_mc_inc(dev, addr); |
| 234 | |
| 235 | if (err) { |
| 236 | sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); |
| 237 | dev_put(dev); |
| 238 | return err; |
| 239 | } |
| 240 | |
| 241 | write_lock_bh(&ipv6_sk_mc_lock); |
| 242 | mc_lst->next = np->ipv6_mc_list; |
| 243 | np->ipv6_mc_list = mc_lst; |
| 244 | write_unlock_bh(&ipv6_sk_mc_lock); |
| 245 | |
| 246 | dev_put(dev); |
| 247 | |
| 248 | return 0; |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * socket leave on multicast group |
| 253 | */ |
| 254 | int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr) |
| 255 | { |
| 256 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 257 | struct ipv6_mc_socklist *mc_lst, **lnk; |
| 258 | |
| 259 | write_lock_bh(&ipv6_sk_mc_lock); |
| 260 | for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) { |
| 261 | if ((ifindex == 0 || mc_lst->ifindex == ifindex) && |
| 262 | ipv6_addr_equal(&mc_lst->addr, addr)) { |
| 263 | struct net_device *dev; |
| 264 | |
| 265 | *lnk = mc_lst->next; |
| 266 | write_unlock_bh(&ipv6_sk_mc_lock); |
| 267 | |
| 268 | if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) { |
| 269 | struct inet6_dev *idev = in6_dev_get(dev); |
| 270 | |
| 271 | if (idev) { |
| 272 | (void) ip6_mc_leave_src(sk,mc_lst,idev); |
| 273 | __ipv6_dev_mc_dec(idev, &mc_lst->addr); |
| 274 | in6_dev_put(idev); |
| 275 | } |
| 276 | dev_put(dev); |
| 277 | } |
| 278 | sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); |
| 279 | return 0; |
| 280 | } |
| 281 | } |
| 282 | write_unlock_bh(&ipv6_sk_mc_lock); |
| 283 | |
| 284 | return -ENOENT; |
| 285 | } |
| 286 | |
| 287 | static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex) |
| 288 | { |
| 289 | struct net_device *dev = NULL; |
| 290 | struct inet6_dev *idev = NULL; |
| 291 | |
| 292 | if (ifindex == 0) { |
| 293 | struct rt6_info *rt; |
| 294 | |
| 295 | rt = rt6_lookup(group, NULL, 0, 0); |
| 296 | if (rt) { |
| 297 | dev = rt->rt6i_dev; |
| 298 | dev_hold(dev); |
| 299 | dst_release(&rt->u.dst); |
| 300 | } |
| 301 | } else |
| 302 | dev = dev_get_by_index(ifindex); |
| 303 | |
| 304 | if (!dev) |
| 305 | return NULL; |
| 306 | idev = in6_dev_get(dev); |
| 307 | if (!idev) { |
| 308 | dev_put(dev); |
| 309 | return NULL; |
| 310 | } |
| 311 | read_lock_bh(&idev->lock); |
| 312 | if (idev->dead) { |
| 313 | read_unlock_bh(&idev->lock); |
| 314 | in6_dev_put(idev); |
| 315 | dev_put(dev); |
| 316 | return NULL; |
| 317 | } |
| 318 | return idev; |
| 319 | } |
| 320 | |
| 321 | void ipv6_sock_mc_close(struct sock *sk) |
| 322 | { |
| 323 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 324 | struct ipv6_mc_socklist *mc_lst; |
| 325 | |
| 326 | write_lock_bh(&ipv6_sk_mc_lock); |
| 327 | while ((mc_lst = np->ipv6_mc_list) != NULL) { |
| 328 | struct net_device *dev; |
| 329 | |
| 330 | np->ipv6_mc_list = mc_lst->next; |
| 331 | write_unlock_bh(&ipv6_sk_mc_lock); |
| 332 | |
| 333 | dev = dev_get_by_index(mc_lst->ifindex); |
| 334 | if (dev) { |
| 335 | struct inet6_dev *idev = in6_dev_get(dev); |
| 336 | |
| 337 | if (idev) { |
| 338 | (void) ip6_mc_leave_src(sk, mc_lst, idev); |
| 339 | __ipv6_dev_mc_dec(idev, &mc_lst->addr); |
| 340 | in6_dev_put(idev); |
| 341 | } |
| 342 | dev_put(dev); |
| 343 | } |
| 344 | |
| 345 | sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); |
| 346 | |
| 347 | write_lock_bh(&ipv6_sk_mc_lock); |
| 348 | } |
| 349 | write_unlock_bh(&ipv6_sk_mc_lock); |
| 350 | } |
| 351 | |
| 352 | int ip6_mc_source(int add, int omode, struct sock *sk, |
| 353 | struct group_source_req *pgsr) |
| 354 | { |
| 355 | struct in6_addr *source, *group; |
| 356 | struct ipv6_mc_socklist *pmc; |
| 357 | struct net_device *dev; |
| 358 | struct inet6_dev *idev; |
| 359 | struct ipv6_pinfo *inet6 = inet6_sk(sk); |
| 360 | struct ip6_sf_socklist *psl; |
| 361 | int i, j, rv; |
David L Stevens | c9e3e8b | 2005-06-21 13:58:25 -0700 | [diff] [blame] | 362 | int leavegroup = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | int err; |
| 364 | |
| 365 | if (pgsr->gsr_group.ss_family != AF_INET6 || |
| 366 | pgsr->gsr_source.ss_family != AF_INET6) |
| 367 | return -EINVAL; |
| 368 | |
| 369 | source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; |
| 370 | group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; |
| 371 | |
| 372 | if (!ipv6_addr_is_multicast(group)) |
| 373 | return -EINVAL; |
| 374 | |
| 375 | idev = ip6_mc_find_dev(group, pgsr->gsr_interface); |
| 376 | if (!idev) |
| 377 | return -ENODEV; |
| 378 | dev = idev->dev; |
| 379 | |
| 380 | err = -EADDRNOTAVAIL; |
| 381 | |
David L Stevens | c9e3e8b | 2005-06-21 13:58:25 -0700 | [diff] [blame] | 382 | read_lock_bh(&ipv6_sk_mc_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { |
| 384 | if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) |
| 385 | continue; |
| 386 | if (ipv6_addr_equal(&pmc->addr, group)) |
| 387 | break; |
| 388 | } |
| 389 | if (!pmc) /* must have a prior join */ |
| 390 | goto done; |
| 391 | /* if a source filter was set, must be the same mode as before */ |
| 392 | if (pmc->sflist) { |
| 393 | if (pmc->sfmode != omode) |
| 394 | goto done; |
| 395 | } else if (pmc->sfmode != omode) { |
| 396 | /* allow mode switches for empty-set filters */ |
| 397 | ip6_mc_add_src(idev, group, omode, 0, NULL, 0); |
| 398 | ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); |
| 399 | pmc->sfmode = omode; |
| 400 | } |
| 401 | |
| 402 | psl = pmc->sflist; |
| 403 | if (!add) { |
| 404 | if (!psl) |
| 405 | goto done; |
| 406 | rv = !0; |
| 407 | for (i=0; i<psl->sl_count; i++) { |
| 408 | rv = memcmp(&psl->sl_addr[i], source, |
| 409 | sizeof(struct in6_addr)); |
| 410 | if (rv == 0) |
| 411 | break; |
| 412 | } |
| 413 | if (rv) /* source not found */ |
| 414 | goto done; |
| 415 | |
David L Stevens | c9e3e8b | 2005-06-21 13:58:25 -0700 | [diff] [blame] | 416 | /* special case - (INCLUDE, empty) == LEAVE_GROUP */ |
| 417 | if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { |
| 418 | leavegroup = 1; |
| 419 | goto done; |
| 420 | } |
| 421 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | /* update the interface filter */ |
| 423 | ip6_mc_del_src(idev, group, omode, 1, source, 1); |
| 424 | |
| 425 | for (j=i+1; j<psl->sl_count; j++) |
| 426 | psl->sl_addr[j-1] = psl->sl_addr[j]; |
| 427 | psl->sl_count--; |
| 428 | err = 0; |
| 429 | goto done; |
| 430 | } |
| 431 | /* else, add a new source to the filter */ |
| 432 | |
| 433 | if (psl && psl->sl_count >= sysctl_mld_max_msf) { |
| 434 | err = -ENOBUFS; |
| 435 | goto done; |
| 436 | } |
| 437 | if (!psl || psl->sl_count == psl->sl_max) { |
| 438 | struct ip6_sf_socklist *newpsl; |
| 439 | int count = IP6_SFBLOCK; |
| 440 | |
| 441 | if (psl) |
| 442 | count += psl->sl_max; |
| 443 | newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk, |
| 444 | IP6_SFLSIZE(count), GFP_ATOMIC); |
| 445 | if (!newpsl) { |
| 446 | err = -ENOBUFS; |
| 447 | goto done; |
| 448 | } |
| 449 | newpsl->sl_max = count; |
| 450 | newpsl->sl_count = count - IP6_SFBLOCK; |
| 451 | if (psl) { |
| 452 | for (i=0; i<psl->sl_count; i++) |
| 453 | newpsl->sl_addr[i] = psl->sl_addr[i]; |
| 454 | sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); |
| 455 | } |
| 456 | pmc->sflist = psl = newpsl; |
| 457 | } |
| 458 | rv = 1; /* > 0 for insert logic below if sl_count is 0 */ |
| 459 | for (i=0; i<psl->sl_count; i++) { |
| 460 | rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); |
| 461 | if (rv == 0) |
| 462 | break; |
| 463 | } |
| 464 | if (rv == 0) /* address already there is an error */ |
| 465 | goto done; |
| 466 | for (j=psl->sl_count-1; j>=i; j--) |
| 467 | psl->sl_addr[j+1] = psl->sl_addr[j]; |
| 468 | psl->sl_addr[i] = *source; |
| 469 | psl->sl_count++; |
| 470 | err = 0; |
| 471 | /* update the interface list */ |
| 472 | ip6_mc_add_src(idev, group, omode, 1, source, 1); |
| 473 | done: |
David L Stevens | c9e3e8b | 2005-06-21 13:58:25 -0700 | [diff] [blame] | 474 | read_unlock_bh(&ipv6_sk_mc_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | read_unlock_bh(&idev->lock); |
| 476 | in6_dev_put(idev); |
| 477 | dev_put(dev); |
David L Stevens | c9e3e8b | 2005-06-21 13:58:25 -0700 | [diff] [blame] | 478 | if (leavegroup) |
| 479 | return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | return err; |
| 481 | } |
| 482 | |
| 483 | int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) |
| 484 | { |
| 485 | struct in6_addr *group; |
| 486 | struct ipv6_mc_socklist *pmc; |
| 487 | struct net_device *dev; |
| 488 | struct inet6_dev *idev; |
| 489 | struct ipv6_pinfo *inet6 = inet6_sk(sk); |
| 490 | struct ip6_sf_socklist *newpsl, *psl; |
| 491 | int i, err; |
| 492 | |
| 493 | group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; |
| 494 | |
| 495 | if (!ipv6_addr_is_multicast(group)) |
| 496 | return -EINVAL; |
| 497 | if (gsf->gf_fmode != MCAST_INCLUDE && |
| 498 | gsf->gf_fmode != MCAST_EXCLUDE) |
| 499 | return -EINVAL; |
| 500 | |
| 501 | idev = ip6_mc_find_dev(group, gsf->gf_interface); |
| 502 | |
| 503 | if (!idev) |
| 504 | return -ENODEV; |
| 505 | dev = idev->dev; |
| 506 | err = -EADDRNOTAVAIL; |
| 507 | |
| 508 | for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { |
| 509 | if (pmc->ifindex != gsf->gf_interface) |
| 510 | continue; |
| 511 | if (ipv6_addr_equal(&pmc->addr, group)) |
| 512 | break; |
| 513 | } |
| 514 | if (!pmc) /* must have a prior join */ |
| 515 | goto done; |
| 516 | if (gsf->gf_numsrc) { |
| 517 | newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk, |
| 518 | IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC); |
| 519 | if (!newpsl) { |
| 520 | err = -ENOBUFS; |
| 521 | goto done; |
| 522 | } |
| 523 | newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; |
| 524 | for (i=0; i<newpsl->sl_count; ++i) { |
| 525 | struct sockaddr_in6 *psin6; |
| 526 | |
| 527 | psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; |
| 528 | newpsl->sl_addr[i] = psin6->sin6_addr; |
| 529 | } |
| 530 | err = ip6_mc_add_src(idev, group, gsf->gf_fmode, |
| 531 | newpsl->sl_count, newpsl->sl_addr, 0); |
| 532 | if (err) { |
| 533 | sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); |
| 534 | goto done; |
| 535 | } |
| 536 | } else |
| 537 | newpsl = NULL; |
| 538 | psl = pmc->sflist; |
| 539 | if (psl) { |
| 540 | (void) ip6_mc_del_src(idev, group, pmc->sfmode, |
| 541 | psl->sl_count, psl->sl_addr, 0); |
| 542 | sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); |
| 543 | } else |
| 544 | (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); |
| 545 | pmc->sflist = newpsl; |
| 546 | pmc->sfmode = gsf->gf_fmode; |
| 547 | done: |
| 548 | read_unlock_bh(&idev->lock); |
| 549 | in6_dev_put(idev); |
| 550 | dev_put(dev); |
| 551 | return err; |
| 552 | } |
| 553 | |
| 554 | int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, |
| 555 | struct group_filter __user *optval, int __user *optlen) |
| 556 | { |
| 557 | int err, i, count, copycount; |
| 558 | struct in6_addr *group; |
| 559 | struct ipv6_mc_socklist *pmc; |
| 560 | struct inet6_dev *idev; |
| 561 | struct net_device *dev; |
| 562 | struct ipv6_pinfo *inet6 = inet6_sk(sk); |
| 563 | struct ip6_sf_socklist *psl; |
| 564 | |
| 565 | group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; |
| 566 | |
| 567 | if (!ipv6_addr_is_multicast(group)) |
| 568 | return -EINVAL; |
| 569 | |
| 570 | idev = ip6_mc_find_dev(group, gsf->gf_interface); |
| 571 | |
| 572 | if (!idev) |
| 573 | return -ENODEV; |
| 574 | |
| 575 | dev = idev->dev; |
| 576 | |
| 577 | err = -EADDRNOTAVAIL; |
| 578 | |
| 579 | for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { |
| 580 | if (pmc->ifindex != gsf->gf_interface) |
| 581 | continue; |
| 582 | if (ipv6_addr_equal(group, &pmc->addr)) |
| 583 | break; |
| 584 | } |
| 585 | if (!pmc) /* must have a prior join */ |
| 586 | goto done; |
| 587 | gsf->gf_fmode = pmc->sfmode; |
| 588 | psl = pmc->sflist; |
| 589 | count = psl ? psl->sl_count : 0; |
| 590 | read_unlock_bh(&idev->lock); |
| 591 | in6_dev_put(idev); |
| 592 | dev_put(dev); |
| 593 | |
| 594 | copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; |
| 595 | gsf->gf_numsrc = count; |
| 596 | if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || |
| 597 | copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { |
| 598 | return -EFAULT; |
| 599 | } |
| 600 | for (i=0; i<copycount; i++) { |
| 601 | struct sockaddr_in6 *psin6; |
| 602 | struct sockaddr_storage ss; |
| 603 | |
| 604 | psin6 = (struct sockaddr_in6 *)&ss; |
| 605 | memset(&ss, 0, sizeof(ss)); |
| 606 | psin6->sin6_family = AF_INET6; |
| 607 | psin6->sin6_addr = psl->sl_addr[i]; |
| 608 | if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) |
| 609 | return -EFAULT; |
| 610 | } |
| 611 | return 0; |
| 612 | done: |
| 613 | read_unlock_bh(&idev->lock); |
| 614 | in6_dev_put(idev); |
| 615 | dev_put(dev); |
| 616 | return err; |
| 617 | } |
| 618 | |
| 619 | int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr, |
| 620 | struct in6_addr *src_addr) |
| 621 | { |
| 622 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 623 | struct ipv6_mc_socklist *mc; |
| 624 | struct ip6_sf_socklist *psl; |
| 625 | int rv = 1; |
| 626 | |
| 627 | read_lock(&ipv6_sk_mc_lock); |
| 628 | for (mc = np->ipv6_mc_list; mc; mc = mc->next) { |
| 629 | if (ipv6_addr_equal(&mc->addr, mc_addr)) |
| 630 | break; |
| 631 | } |
| 632 | if (!mc) { |
| 633 | read_unlock(&ipv6_sk_mc_lock); |
| 634 | return 1; |
| 635 | } |
| 636 | psl = mc->sflist; |
| 637 | if (!psl) { |
| 638 | rv = mc->sfmode == MCAST_EXCLUDE; |
| 639 | } else { |
| 640 | int i; |
| 641 | |
| 642 | for (i=0; i<psl->sl_count; i++) { |
| 643 | if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) |
| 644 | break; |
| 645 | } |
| 646 | if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) |
| 647 | rv = 0; |
| 648 | if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
| 649 | rv = 0; |
| 650 | } |
| 651 | read_unlock(&ipv6_sk_mc_lock); |
| 652 | |
| 653 | return rv; |
| 654 | } |
| 655 | |
| 656 | static void ma_put(struct ifmcaddr6 *mc) |
| 657 | { |
| 658 | if (atomic_dec_and_test(&mc->mca_refcnt)) { |
| 659 | in6_dev_put(mc->idev); |
| 660 | kfree(mc); |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | static void igmp6_group_added(struct ifmcaddr6 *mc) |
| 665 | { |
| 666 | struct net_device *dev = mc->idev->dev; |
| 667 | char buf[MAX_ADDR_LEN]; |
| 668 | |
| 669 | spin_lock_bh(&mc->mca_lock); |
| 670 | if (!(mc->mca_flags&MAF_LOADED)) { |
| 671 | mc->mca_flags |= MAF_LOADED; |
| 672 | if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) |
| 673 | dev_mc_add(dev, buf, dev->addr_len, 0); |
| 674 | } |
| 675 | spin_unlock_bh(&mc->mca_lock); |
| 676 | |
| 677 | if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) |
| 678 | return; |
| 679 | |
| 680 | if (MLD_V1_SEEN(mc->idev)) { |
| 681 | igmp6_join_group(mc); |
| 682 | return; |
| 683 | } |
| 684 | /* else v2 */ |
| 685 | |
| 686 | mc->mca_crcount = mc->idev->mc_qrv; |
| 687 | mld_ifc_event(mc->idev); |
| 688 | } |
| 689 | |
| 690 | static void igmp6_group_dropped(struct ifmcaddr6 *mc) |
| 691 | { |
| 692 | struct net_device *dev = mc->idev->dev; |
| 693 | char buf[MAX_ADDR_LEN]; |
| 694 | |
| 695 | spin_lock_bh(&mc->mca_lock); |
| 696 | if (mc->mca_flags&MAF_LOADED) { |
| 697 | mc->mca_flags &= ~MAF_LOADED; |
| 698 | if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) |
| 699 | dev_mc_delete(dev, buf, dev->addr_len, 0); |
| 700 | } |
| 701 | |
| 702 | if (mc->mca_flags & MAF_NOREPORT) |
| 703 | goto done; |
| 704 | spin_unlock_bh(&mc->mca_lock); |
| 705 | |
| 706 | if (!mc->idev->dead) |
| 707 | igmp6_leave_group(mc); |
| 708 | |
| 709 | spin_lock_bh(&mc->mca_lock); |
| 710 | if (del_timer(&mc->mca_timer)) |
| 711 | atomic_dec(&mc->mca_refcnt); |
| 712 | done: |
| 713 | ip6_mc_clear_src(mc); |
| 714 | spin_unlock_bh(&mc->mca_lock); |
| 715 | } |
| 716 | |
| 717 | /* |
| 718 | * deleted ifmcaddr6 manipulation |
| 719 | */ |
| 720 | static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) |
| 721 | { |
| 722 | struct ifmcaddr6 *pmc; |
| 723 | |
| 724 | /* this is an "ifmcaddr6" for convenience; only the fields below |
| 725 | * are actually used. In particular, the refcnt and users are not |
| 726 | * used for management of the delete list. Using the same structure |
| 727 | * for deleted items allows change reports to use common code with |
| 728 | * non-deleted or query-response MCA's. |
| 729 | */ |
| 730 | pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC); |
| 731 | if (!pmc) |
| 732 | return; |
| 733 | memset(pmc, 0, sizeof(*pmc)); |
| 734 | spin_lock_bh(&im->mca_lock); |
| 735 | spin_lock_init(&pmc->mca_lock); |
| 736 | pmc->idev = im->idev; |
| 737 | in6_dev_hold(idev); |
| 738 | pmc->mca_addr = im->mca_addr; |
| 739 | pmc->mca_crcount = idev->mc_qrv; |
| 740 | pmc->mca_sfmode = im->mca_sfmode; |
| 741 | if (pmc->mca_sfmode == MCAST_INCLUDE) { |
| 742 | struct ip6_sf_list *psf; |
| 743 | |
| 744 | pmc->mca_tomb = im->mca_tomb; |
| 745 | pmc->mca_sources = im->mca_sources; |
| 746 | im->mca_tomb = im->mca_sources = NULL; |
| 747 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) |
| 748 | psf->sf_crcount = pmc->mca_crcount; |
| 749 | } |
| 750 | spin_unlock_bh(&im->mca_lock); |
| 751 | |
| 752 | write_lock_bh(&idev->mc_lock); |
| 753 | pmc->next = idev->mc_tomb; |
| 754 | idev->mc_tomb = pmc; |
| 755 | write_unlock_bh(&idev->mc_lock); |
| 756 | } |
| 757 | |
| 758 | static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) |
| 759 | { |
| 760 | struct ifmcaddr6 *pmc, *pmc_prev; |
| 761 | struct ip6_sf_list *psf, *psf_next; |
| 762 | |
| 763 | write_lock_bh(&idev->mc_lock); |
| 764 | pmc_prev = NULL; |
| 765 | for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { |
| 766 | if (ipv6_addr_equal(&pmc->mca_addr, pmca)) |
| 767 | break; |
| 768 | pmc_prev = pmc; |
| 769 | } |
| 770 | if (pmc) { |
| 771 | if (pmc_prev) |
| 772 | pmc_prev->next = pmc->next; |
| 773 | else |
| 774 | idev->mc_tomb = pmc->next; |
| 775 | } |
| 776 | write_unlock_bh(&idev->mc_lock); |
| 777 | if (pmc) { |
| 778 | for (psf=pmc->mca_tomb; psf; psf=psf_next) { |
| 779 | psf_next = psf->sf_next; |
| 780 | kfree(psf); |
| 781 | } |
| 782 | in6_dev_put(pmc->idev); |
| 783 | kfree(pmc); |
| 784 | } |
| 785 | } |
| 786 | |
| 787 | static void mld_clear_delrec(struct inet6_dev *idev) |
| 788 | { |
| 789 | struct ifmcaddr6 *pmc, *nextpmc; |
| 790 | |
| 791 | write_lock_bh(&idev->mc_lock); |
| 792 | pmc = idev->mc_tomb; |
| 793 | idev->mc_tomb = NULL; |
| 794 | write_unlock_bh(&idev->mc_lock); |
| 795 | |
| 796 | for (; pmc; pmc = nextpmc) { |
| 797 | nextpmc = pmc->next; |
| 798 | ip6_mc_clear_src(pmc); |
| 799 | in6_dev_put(pmc->idev); |
| 800 | kfree(pmc); |
| 801 | } |
| 802 | |
| 803 | /* clear dead sources, too */ |
| 804 | read_lock_bh(&idev->lock); |
| 805 | for (pmc=idev->mc_list; pmc; pmc=pmc->next) { |
| 806 | struct ip6_sf_list *psf, *psf_next; |
| 807 | |
| 808 | spin_lock_bh(&pmc->mca_lock); |
| 809 | psf = pmc->mca_tomb; |
| 810 | pmc->mca_tomb = NULL; |
| 811 | spin_unlock_bh(&pmc->mca_lock); |
| 812 | for (; psf; psf=psf_next) { |
| 813 | psf_next = psf->sf_next; |
| 814 | kfree(psf); |
| 815 | } |
| 816 | } |
| 817 | read_unlock_bh(&idev->lock); |
| 818 | } |
| 819 | |
| 820 | |
| 821 | /* |
| 822 | * device multicast group inc (add if not found) |
| 823 | */ |
| 824 | int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr) |
| 825 | { |
| 826 | struct ifmcaddr6 *mc; |
| 827 | struct inet6_dev *idev; |
| 828 | |
| 829 | idev = in6_dev_get(dev); |
| 830 | |
| 831 | if (idev == NULL) |
| 832 | return -EINVAL; |
| 833 | |
| 834 | write_lock_bh(&idev->lock); |
| 835 | if (idev->dead) { |
| 836 | write_unlock_bh(&idev->lock); |
| 837 | in6_dev_put(idev); |
| 838 | return -ENODEV; |
| 839 | } |
| 840 | |
| 841 | for (mc = idev->mc_list; mc; mc = mc->next) { |
| 842 | if (ipv6_addr_equal(&mc->mca_addr, addr)) { |
| 843 | mc->mca_users++; |
| 844 | write_unlock_bh(&idev->lock); |
| 845 | ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, |
| 846 | NULL, 0); |
| 847 | in6_dev_put(idev); |
| 848 | return 0; |
| 849 | } |
| 850 | } |
| 851 | |
| 852 | /* |
| 853 | * not found: create a new one. |
| 854 | */ |
| 855 | |
| 856 | mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); |
| 857 | |
| 858 | if (mc == NULL) { |
| 859 | write_unlock_bh(&idev->lock); |
| 860 | in6_dev_put(idev); |
| 861 | return -ENOMEM; |
| 862 | } |
| 863 | |
| 864 | memset(mc, 0, sizeof(struct ifmcaddr6)); |
| 865 | init_timer(&mc->mca_timer); |
| 866 | mc->mca_timer.function = igmp6_timer_handler; |
| 867 | mc->mca_timer.data = (unsigned long) mc; |
| 868 | |
| 869 | ipv6_addr_copy(&mc->mca_addr, addr); |
| 870 | mc->idev = idev; |
| 871 | mc->mca_users = 1; |
| 872 | /* mca_stamp should be updated upon changes */ |
| 873 | mc->mca_cstamp = mc->mca_tstamp = jiffies; |
| 874 | atomic_set(&mc->mca_refcnt, 2); |
| 875 | spin_lock_init(&mc->mca_lock); |
| 876 | |
| 877 | /* initial mode is (EX, empty) */ |
| 878 | mc->mca_sfmode = MCAST_EXCLUDE; |
| 879 | mc->mca_sfcount[MCAST_EXCLUDE] = 1; |
| 880 | |
| 881 | if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || |
| 882 | IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) |
| 883 | mc->mca_flags |= MAF_NOREPORT; |
| 884 | |
| 885 | mc->next = idev->mc_list; |
| 886 | idev->mc_list = mc; |
| 887 | write_unlock_bh(&idev->lock); |
| 888 | |
| 889 | mld_del_delrec(idev, &mc->mca_addr); |
| 890 | igmp6_group_added(mc); |
| 891 | ma_put(mc); |
| 892 | return 0; |
| 893 | } |
| 894 | |
| 895 | /* |
| 896 | * device multicast group del |
| 897 | */ |
| 898 | int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr) |
| 899 | { |
| 900 | struct ifmcaddr6 *ma, **map; |
| 901 | |
| 902 | write_lock_bh(&idev->lock); |
| 903 | for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { |
| 904 | if (ipv6_addr_equal(&ma->mca_addr, addr)) { |
| 905 | if (--ma->mca_users == 0) { |
| 906 | *map = ma->next; |
| 907 | write_unlock_bh(&idev->lock); |
| 908 | |
| 909 | igmp6_group_dropped(ma); |
| 910 | |
| 911 | ma_put(ma); |
| 912 | return 0; |
| 913 | } |
| 914 | write_unlock_bh(&idev->lock); |
| 915 | return 0; |
| 916 | } |
| 917 | } |
| 918 | write_unlock_bh(&idev->lock); |
| 919 | |
| 920 | return -ENOENT; |
| 921 | } |
| 922 | |
| 923 | int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr) |
| 924 | { |
| 925 | struct inet6_dev *idev = in6_dev_get(dev); |
| 926 | int err; |
| 927 | |
| 928 | if (!idev) |
| 929 | return -ENODEV; |
| 930 | |
| 931 | err = __ipv6_dev_mc_dec(idev, addr); |
| 932 | |
| 933 | in6_dev_put(idev); |
| 934 | |
| 935 | return err; |
| 936 | } |
| 937 | |
| 938 | /* |
| 939 | * identify MLD packets for MLD filter exceptions |
| 940 | */ |
| 941 | int ipv6_is_mld(struct sk_buff *skb, int nexthdr) |
| 942 | { |
| 943 | struct icmp6hdr *pic; |
| 944 | |
| 945 | if (nexthdr != IPPROTO_ICMPV6) |
| 946 | return 0; |
| 947 | |
| 948 | if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) |
| 949 | return 0; |
| 950 | |
| 951 | pic = (struct icmp6hdr *)skb->h.raw; |
| 952 | |
| 953 | switch (pic->icmp6_type) { |
| 954 | case ICMPV6_MGM_QUERY: |
| 955 | case ICMPV6_MGM_REPORT: |
| 956 | case ICMPV6_MGM_REDUCTION: |
| 957 | case ICMPV6_MLD2_REPORT: |
| 958 | return 1; |
| 959 | default: |
| 960 | break; |
| 961 | } |
| 962 | return 0; |
| 963 | } |
| 964 | |
| 965 | /* |
| 966 | * check if the interface/address pair is valid |
| 967 | */ |
| 968 | int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group, |
| 969 | struct in6_addr *src_addr) |
| 970 | { |
| 971 | struct inet6_dev *idev; |
| 972 | struct ifmcaddr6 *mc; |
| 973 | int rv = 0; |
| 974 | |
| 975 | idev = in6_dev_get(dev); |
| 976 | if (idev) { |
| 977 | read_lock_bh(&idev->lock); |
| 978 | for (mc = idev->mc_list; mc; mc=mc->next) { |
| 979 | if (ipv6_addr_equal(&mc->mca_addr, group)) |
| 980 | break; |
| 981 | } |
| 982 | if (mc) { |
| 983 | if (src_addr && !ipv6_addr_any(src_addr)) { |
| 984 | struct ip6_sf_list *psf; |
| 985 | |
| 986 | spin_lock_bh(&mc->mca_lock); |
| 987 | for (psf=mc->mca_sources;psf;psf=psf->sf_next) { |
| 988 | if (ipv6_addr_equal(&psf->sf_addr, src_addr)) |
| 989 | break; |
| 990 | } |
| 991 | if (psf) |
| 992 | rv = psf->sf_count[MCAST_INCLUDE] || |
| 993 | psf->sf_count[MCAST_EXCLUDE] != |
| 994 | mc->mca_sfcount[MCAST_EXCLUDE]; |
| 995 | else |
| 996 | rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; |
| 997 | spin_unlock_bh(&mc->mca_lock); |
| 998 | } else |
| 999 | rv = 1; /* don't filter unspecified source */ |
| 1000 | } |
| 1001 | read_unlock_bh(&idev->lock); |
| 1002 | in6_dev_put(idev); |
| 1003 | } |
| 1004 | return rv; |
| 1005 | } |
| 1006 | |
| 1007 | static void mld_gq_start_timer(struct inet6_dev *idev) |
| 1008 | { |
| 1009 | int tv = net_random() % idev->mc_maxdelay; |
| 1010 | |
| 1011 | idev->mc_gq_running = 1; |
| 1012 | if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) |
| 1013 | in6_dev_hold(idev); |
| 1014 | } |
| 1015 | |
| 1016 | static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) |
| 1017 | { |
| 1018 | int tv = net_random() % delay; |
| 1019 | |
| 1020 | if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) |
| 1021 | in6_dev_hold(idev); |
| 1022 | } |
| 1023 | |
| 1024 | /* |
| 1025 | * IGMP handling (alias multicast ICMPv6 messages) |
| 1026 | */ |
| 1027 | |
| 1028 | static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) |
| 1029 | { |
| 1030 | unsigned long delay = resptime; |
| 1031 | |
| 1032 | /* Do not start timer for these addresses */ |
| 1033 | if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || |
| 1034 | IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) |
| 1035 | return; |
| 1036 | |
| 1037 | if (del_timer(&ma->mca_timer)) { |
| 1038 | atomic_dec(&ma->mca_refcnt); |
| 1039 | delay = ma->mca_timer.expires - jiffies; |
| 1040 | } |
| 1041 | |
| 1042 | if (delay >= resptime) { |
| 1043 | if (resptime) |
| 1044 | delay = net_random() % resptime; |
| 1045 | else |
| 1046 | delay = 1; |
| 1047 | } |
| 1048 | ma->mca_timer.expires = jiffies + delay; |
| 1049 | if (!mod_timer(&ma->mca_timer, jiffies + delay)) |
| 1050 | atomic_inc(&ma->mca_refcnt); |
| 1051 | ma->mca_flags |= MAF_TIMER_RUNNING; |
| 1052 | } |
| 1053 | |
| 1054 | static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, |
| 1055 | struct in6_addr *srcs) |
| 1056 | { |
| 1057 | struct ip6_sf_list *psf; |
| 1058 | int i, scount; |
| 1059 | |
| 1060 | scount = 0; |
| 1061 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { |
| 1062 | if (scount == nsrcs) |
| 1063 | break; |
| 1064 | for (i=0; i<nsrcs; i++) |
| 1065 | if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { |
| 1066 | psf->sf_gsresp = 1; |
| 1067 | scount++; |
| 1068 | break; |
| 1069 | } |
| 1070 | } |
| 1071 | } |
| 1072 | |
| 1073 | int igmp6_event_query(struct sk_buff *skb) |
| 1074 | { |
| 1075 | struct mld2_query *mlh2 = (struct mld2_query *) skb->h.raw; |
| 1076 | struct ifmcaddr6 *ma; |
| 1077 | struct in6_addr *group; |
| 1078 | unsigned long max_delay; |
| 1079 | struct inet6_dev *idev; |
| 1080 | struct icmp6hdr *hdr; |
| 1081 | int group_type; |
| 1082 | int mark = 0; |
| 1083 | int len; |
| 1084 | |
| 1085 | if (!pskb_may_pull(skb, sizeof(struct in6_addr))) |
| 1086 | return -EINVAL; |
| 1087 | |
| 1088 | /* compute payload length excluding extension headers */ |
| 1089 | len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr); |
| 1090 | len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h; |
| 1091 | |
| 1092 | /* Drop queries with not link local source */ |
| 1093 | if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL)) |
| 1094 | return -EINVAL; |
| 1095 | |
| 1096 | idev = in6_dev_get(skb->dev); |
| 1097 | |
| 1098 | if (idev == NULL) |
| 1099 | return 0; |
| 1100 | |
| 1101 | hdr = (struct icmp6hdr *) skb->h.raw; |
| 1102 | group = (struct in6_addr *) (hdr + 1); |
| 1103 | group_type = ipv6_addr_type(group); |
| 1104 | |
| 1105 | if (group_type != IPV6_ADDR_ANY && |
| 1106 | !(group_type&IPV6_ADDR_MULTICAST)) { |
| 1107 | in6_dev_put(idev); |
| 1108 | return -EINVAL; |
| 1109 | } |
| 1110 | |
| 1111 | if (len == 24) { |
| 1112 | int switchback; |
| 1113 | /* MLDv1 router present */ |
| 1114 | |
| 1115 | /* Translate milliseconds to jiffies */ |
| 1116 | max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; |
| 1117 | |
| 1118 | switchback = (idev->mc_qrv + 1) * max_delay; |
| 1119 | idev->mc_v1_seen = jiffies + switchback; |
| 1120 | |
| 1121 | /* cancel the interface change timer */ |
| 1122 | idev->mc_ifc_count = 0; |
| 1123 | if (del_timer(&idev->mc_ifc_timer)) |
| 1124 | __in6_dev_put(idev); |
| 1125 | /* clear deleted report items */ |
| 1126 | mld_clear_delrec(idev); |
| 1127 | } else if (len >= 28) { |
| 1128 | max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; |
| 1129 | if (!max_delay) |
| 1130 | max_delay = 1; |
| 1131 | idev->mc_maxdelay = max_delay; |
| 1132 | if (mlh2->qrv) |
| 1133 | idev->mc_qrv = mlh2->qrv; |
| 1134 | if (group_type == IPV6_ADDR_ANY) { /* general query */ |
| 1135 | if (mlh2->nsrcs) { |
| 1136 | in6_dev_put(idev); |
| 1137 | return -EINVAL; /* no sources allowed */ |
| 1138 | } |
| 1139 | mld_gq_start_timer(idev); |
| 1140 | in6_dev_put(idev); |
| 1141 | return 0; |
| 1142 | } |
| 1143 | /* mark sources to include, if group & source-specific */ |
| 1144 | mark = mlh2->nsrcs != 0; |
| 1145 | } else { |
| 1146 | in6_dev_put(idev); |
| 1147 | return -EINVAL; |
| 1148 | } |
| 1149 | |
| 1150 | read_lock_bh(&idev->lock); |
| 1151 | if (group_type == IPV6_ADDR_ANY) { |
| 1152 | for (ma = idev->mc_list; ma; ma=ma->next) { |
| 1153 | spin_lock_bh(&ma->mca_lock); |
| 1154 | igmp6_group_queried(ma, max_delay); |
| 1155 | spin_unlock_bh(&ma->mca_lock); |
| 1156 | } |
| 1157 | } else { |
| 1158 | for (ma = idev->mc_list; ma; ma=ma->next) { |
| 1159 | if (group_type != IPV6_ADDR_ANY && |
| 1160 | !ipv6_addr_equal(group, &ma->mca_addr)) |
| 1161 | continue; |
| 1162 | spin_lock_bh(&ma->mca_lock); |
| 1163 | if (ma->mca_flags & MAF_TIMER_RUNNING) { |
| 1164 | /* gsquery <- gsquery && mark */ |
| 1165 | if (!mark) |
| 1166 | ma->mca_flags &= ~MAF_GSQUERY; |
| 1167 | } else { |
| 1168 | /* gsquery <- mark */ |
| 1169 | if (mark) |
| 1170 | ma->mca_flags |= MAF_GSQUERY; |
| 1171 | else |
| 1172 | ma->mca_flags &= ~MAF_GSQUERY; |
| 1173 | } |
| 1174 | if (ma->mca_flags & MAF_GSQUERY) |
| 1175 | mld_marksources(ma, ntohs(mlh2->nsrcs), |
| 1176 | mlh2->srcs); |
| 1177 | igmp6_group_queried(ma, max_delay); |
| 1178 | spin_unlock_bh(&ma->mca_lock); |
| 1179 | if (group_type != IPV6_ADDR_ANY) |
| 1180 | break; |
| 1181 | } |
| 1182 | } |
| 1183 | read_unlock_bh(&idev->lock); |
| 1184 | in6_dev_put(idev); |
| 1185 | |
| 1186 | return 0; |
| 1187 | } |
| 1188 | |
| 1189 | |
| 1190 | int igmp6_event_report(struct sk_buff *skb) |
| 1191 | { |
| 1192 | struct ifmcaddr6 *ma; |
| 1193 | struct in6_addr *addrp; |
| 1194 | struct inet6_dev *idev; |
| 1195 | struct icmp6hdr *hdr; |
| 1196 | int addr_type; |
| 1197 | |
| 1198 | /* Our own report looped back. Ignore it. */ |
| 1199 | if (skb->pkt_type == PACKET_LOOPBACK) |
| 1200 | return 0; |
| 1201 | |
| 1202 | if (!pskb_may_pull(skb, sizeof(struct in6_addr))) |
| 1203 | return -EINVAL; |
| 1204 | |
| 1205 | hdr = (struct icmp6hdr*) skb->h.raw; |
| 1206 | |
| 1207 | /* Drop reports with not link local source */ |
| 1208 | addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr); |
| 1209 | if (addr_type != IPV6_ADDR_ANY && |
| 1210 | !(addr_type&IPV6_ADDR_LINKLOCAL)) |
| 1211 | return -EINVAL; |
| 1212 | |
| 1213 | addrp = (struct in6_addr *) (hdr + 1); |
| 1214 | |
| 1215 | idev = in6_dev_get(skb->dev); |
| 1216 | if (idev == NULL) |
| 1217 | return -ENODEV; |
| 1218 | |
| 1219 | /* |
| 1220 | * Cancel the timer for this group |
| 1221 | */ |
| 1222 | |
| 1223 | read_lock_bh(&idev->lock); |
| 1224 | for (ma = idev->mc_list; ma; ma=ma->next) { |
| 1225 | if (ipv6_addr_equal(&ma->mca_addr, addrp)) { |
| 1226 | spin_lock(&ma->mca_lock); |
| 1227 | if (del_timer(&ma->mca_timer)) |
| 1228 | atomic_dec(&ma->mca_refcnt); |
| 1229 | ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); |
| 1230 | spin_unlock(&ma->mca_lock); |
| 1231 | break; |
| 1232 | } |
| 1233 | } |
| 1234 | read_unlock_bh(&idev->lock); |
| 1235 | in6_dev_put(idev); |
| 1236 | return 0; |
| 1237 | } |
| 1238 | |
| 1239 | static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, |
| 1240 | int gdeleted, int sdeleted) |
| 1241 | { |
| 1242 | switch (type) { |
| 1243 | case MLD2_MODE_IS_INCLUDE: |
| 1244 | case MLD2_MODE_IS_EXCLUDE: |
| 1245 | if (gdeleted || sdeleted) |
| 1246 | return 0; |
| 1247 | return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp); |
| 1248 | case MLD2_CHANGE_TO_INCLUDE: |
| 1249 | if (gdeleted || sdeleted) |
| 1250 | return 0; |
| 1251 | return psf->sf_count[MCAST_INCLUDE] != 0; |
| 1252 | case MLD2_CHANGE_TO_EXCLUDE: |
| 1253 | if (gdeleted || sdeleted) |
| 1254 | return 0; |
| 1255 | if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || |
| 1256 | psf->sf_count[MCAST_INCLUDE]) |
| 1257 | return 0; |
| 1258 | return pmc->mca_sfcount[MCAST_EXCLUDE] == |
| 1259 | psf->sf_count[MCAST_EXCLUDE]; |
| 1260 | case MLD2_ALLOW_NEW_SOURCES: |
| 1261 | if (gdeleted || !psf->sf_crcount) |
| 1262 | return 0; |
| 1263 | return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; |
| 1264 | case MLD2_BLOCK_OLD_SOURCES: |
| 1265 | if (pmc->mca_sfmode == MCAST_INCLUDE) |
| 1266 | return gdeleted || (psf->sf_crcount && sdeleted); |
| 1267 | return psf->sf_crcount && !gdeleted && !sdeleted; |
| 1268 | } |
| 1269 | return 0; |
| 1270 | } |
| 1271 | |
| 1272 | static int |
| 1273 | mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) |
| 1274 | { |
| 1275 | struct ip6_sf_list *psf; |
| 1276 | int scount = 0; |
| 1277 | |
| 1278 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { |
| 1279 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) |
| 1280 | continue; |
| 1281 | scount++; |
| 1282 | } |
| 1283 | return scount; |
| 1284 | } |
| 1285 | |
| 1286 | static struct sk_buff *mld_newpack(struct net_device *dev, int size) |
| 1287 | { |
| 1288 | struct sock *sk = igmp6_socket->sk; |
| 1289 | struct sk_buff *skb; |
| 1290 | struct mld2_report *pmr; |
| 1291 | struct in6_addr addr_buf; |
| 1292 | int err; |
| 1293 | u8 ra[8] = { IPPROTO_ICMPV6, 0, |
| 1294 | IPV6_TLV_ROUTERALERT, 2, 0, 0, |
| 1295 | IPV6_TLV_PADN, 0 }; |
| 1296 | |
| 1297 | /* we assume size > sizeof(ra) here */ |
| 1298 | skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); |
| 1299 | |
| 1300 | if (skb == 0) |
| 1301 | return NULL; |
| 1302 | |
| 1303 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 1304 | if (dev->hard_header) { |
| 1305 | unsigned char ha[MAX_ADDR_LEN]; |
| 1306 | |
| 1307 | ndisc_mc_map(&mld2_all_mcr, ha, dev, 1); |
| 1308 | if (dev->hard_header(skb, dev, ETH_P_IPV6,ha,NULL,size) < 0) { |
| 1309 | kfree_skb(skb); |
| 1310 | return NULL; |
| 1311 | } |
| 1312 | } |
| 1313 | |
| 1314 | if (ipv6_get_lladdr(dev, &addr_buf)) { |
| 1315 | /* <draft-ietf-magma-mld-source-05.txt>: |
| 1316 | * use unspecified address as the source address |
| 1317 | * when a valid link-local address is not available. |
| 1318 | */ |
| 1319 | memset(&addr_buf, 0, sizeof(addr_buf)); |
| 1320 | } |
| 1321 | |
| 1322 | ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); |
| 1323 | |
| 1324 | memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); |
| 1325 | |
| 1326 | pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr)); |
| 1327 | skb->h.raw = (unsigned char *)pmr; |
| 1328 | pmr->type = ICMPV6_MLD2_REPORT; |
| 1329 | pmr->resv1 = 0; |
| 1330 | pmr->csum = 0; |
| 1331 | pmr->resv2 = 0; |
| 1332 | pmr->ngrec = 0; |
| 1333 | return skb; |
| 1334 | } |
| 1335 | |
| 1336 | static void mld_sendpack(struct sk_buff *skb) |
| 1337 | { |
| 1338 | struct ipv6hdr *pip6 = skb->nh.ipv6h; |
| 1339 | struct mld2_report *pmr = (struct mld2_report *)skb->h.raw; |
| 1340 | int payload_len, mldlen; |
| 1341 | struct inet6_dev *idev = in6_dev_get(skb->dev); |
| 1342 | int err; |
| 1343 | |
| 1344 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); |
| 1345 | payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h - |
| 1346 | sizeof(struct ipv6hdr); |
| 1347 | mldlen = skb->tail - skb->h.raw; |
| 1348 | pip6->payload_len = htons(payload_len); |
| 1349 | |
| 1350 | pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, |
| 1351 | IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0)); |
| 1352 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, |
| 1353 | dev_queue_xmit); |
| 1354 | if (!err) { |
| 1355 | ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS); |
| 1356 | IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); |
| 1357 | } else |
| 1358 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); |
| 1359 | |
| 1360 | if (likely(idev != NULL)) |
| 1361 | in6_dev_put(idev); |
| 1362 | } |
| 1363 | |
| 1364 | static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) |
| 1365 | { |
| 1366 | return sizeof(struct mld2_grec) + 4*mld_scount(pmc,type,gdel,sdel); |
| 1367 | } |
| 1368 | |
| 1369 | static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, |
| 1370 | int type, struct mld2_grec **ppgr) |
| 1371 | { |
| 1372 | struct net_device *dev = pmc->idev->dev; |
| 1373 | struct mld2_report *pmr; |
| 1374 | struct mld2_grec *pgr; |
| 1375 | |
| 1376 | if (!skb) |
| 1377 | skb = mld_newpack(dev, dev->mtu); |
| 1378 | if (!skb) |
| 1379 | return NULL; |
| 1380 | pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); |
| 1381 | pgr->grec_type = type; |
| 1382 | pgr->grec_auxwords = 0; |
| 1383 | pgr->grec_nsrcs = 0; |
| 1384 | pgr->grec_mca = pmc->mca_addr; /* structure copy */ |
| 1385 | pmr = (struct mld2_report *)skb->h.raw; |
| 1386 | pmr->ngrec = htons(ntohs(pmr->ngrec)+1); |
| 1387 | *ppgr = pgr; |
| 1388 | return skb; |
| 1389 | } |
| 1390 | |
| 1391 | #define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ |
| 1392 | skb_tailroom(skb)) : 0) |
| 1393 | |
| 1394 | static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, |
| 1395 | int type, int gdeleted, int sdeleted) |
| 1396 | { |
| 1397 | struct net_device *dev = pmc->idev->dev; |
| 1398 | struct mld2_report *pmr; |
| 1399 | struct mld2_grec *pgr = NULL; |
| 1400 | struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; |
| 1401 | int scount, first, isquery, truncate; |
| 1402 | |
| 1403 | if (pmc->mca_flags & MAF_NOREPORT) |
| 1404 | return skb; |
| 1405 | |
| 1406 | isquery = type == MLD2_MODE_IS_INCLUDE || |
| 1407 | type == MLD2_MODE_IS_EXCLUDE; |
| 1408 | truncate = type == MLD2_MODE_IS_EXCLUDE || |
| 1409 | type == MLD2_CHANGE_TO_EXCLUDE; |
| 1410 | |
| 1411 | psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; |
| 1412 | |
| 1413 | if (!*psf_list) { |
| 1414 | if (type == MLD2_ALLOW_NEW_SOURCES || |
| 1415 | type == MLD2_BLOCK_OLD_SOURCES) |
| 1416 | return skb; |
| 1417 | if (pmc->mca_crcount || isquery) { |
| 1418 | /* make sure we have room for group header and at |
| 1419 | * least one source. |
| 1420 | */ |
| 1421 | if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+ |
| 1422 | sizeof(struct in6_addr)) { |
| 1423 | mld_sendpack(skb); |
| 1424 | skb = NULL; /* add_grhead will get a new one */ |
| 1425 | } |
| 1426 | skb = add_grhead(skb, pmc, type, &pgr); |
| 1427 | } |
| 1428 | return skb; |
| 1429 | } |
| 1430 | pmr = skb ? (struct mld2_report *)skb->h.raw : NULL; |
| 1431 | |
| 1432 | /* EX and TO_EX get a fresh packet, if needed */ |
| 1433 | if (truncate) { |
| 1434 | if (pmr && pmr->ngrec && |
| 1435 | AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { |
| 1436 | if (skb) |
| 1437 | mld_sendpack(skb); |
| 1438 | skb = mld_newpack(dev, dev->mtu); |
| 1439 | } |
| 1440 | } |
| 1441 | first = 1; |
| 1442 | scount = 0; |
| 1443 | psf_prev = NULL; |
| 1444 | for (psf=*psf_list; psf; psf=psf_next) { |
| 1445 | struct in6_addr *psrc; |
| 1446 | |
| 1447 | psf_next = psf->sf_next; |
| 1448 | |
| 1449 | if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { |
| 1450 | psf_prev = psf; |
| 1451 | continue; |
| 1452 | } |
| 1453 | |
| 1454 | /* clear marks on query responses */ |
| 1455 | if (isquery) |
| 1456 | psf->sf_gsresp = 0; |
| 1457 | |
| 1458 | if (AVAILABLE(skb) < sizeof(*psrc) + |
| 1459 | first*sizeof(struct mld2_grec)) { |
| 1460 | if (truncate && !first) |
| 1461 | break; /* truncate these */ |
| 1462 | if (pgr) |
| 1463 | pgr->grec_nsrcs = htons(scount); |
| 1464 | if (skb) |
| 1465 | mld_sendpack(skb); |
| 1466 | skb = mld_newpack(dev, dev->mtu); |
| 1467 | first = 1; |
| 1468 | scount = 0; |
| 1469 | } |
| 1470 | if (first) { |
| 1471 | skb = add_grhead(skb, pmc, type, &pgr); |
| 1472 | first = 0; |
| 1473 | } |
| 1474 | psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); |
| 1475 | *psrc = psf->sf_addr; |
| 1476 | scount++; |
| 1477 | if ((type == MLD2_ALLOW_NEW_SOURCES || |
| 1478 | type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { |
| 1479 | psf->sf_crcount--; |
| 1480 | if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { |
| 1481 | if (psf_prev) |
| 1482 | psf_prev->sf_next = psf->sf_next; |
| 1483 | else |
| 1484 | *psf_list = psf->sf_next; |
| 1485 | kfree(psf); |
| 1486 | continue; |
| 1487 | } |
| 1488 | } |
| 1489 | psf_prev = psf; |
| 1490 | } |
| 1491 | if (pgr) |
| 1492 | pgr->grec_nsrcs = htons(scount); |
| 1493 | |
| 1494 | if (isquery) |
| 1495 | pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ |
| 1496 | return skb; |
| 1497 | } |
| 1498 | |
| 1499 | static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) |
| 1500 | { |
| 1501 | struct sk_buff *skb = NULL; |
| 1502 | int type; |
| 1503 | |
| 1504 | if (!pmc) { |
| 1505 | read_lock_bh(&idev->lock); |
| 1506 | for (pmc=idev->mc_list; pmc; pmc=pmc->next) { |
| 1507 | if (pmc->mca_flags & MAF_NOREPORT) |
| 1508 | continue; |
| 1509 | spin_lock_bh(&pmc->mca_lock); |
| 1510 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
| 1511 | type = MLD2_MODE_IS_EXCLUDE; |
| 1512 | else |
| 1513 | type = MLD2_MODE_IS_INCLUDE; |
| 1514 | skb = add_grec(skb, pmc, type, 0, 0); |
| 1515 | spin_unlock_bh(&pmc->mca_lock); |
| 1516 | } |
| 1517 | read_unlock_bh(&idev->lock); |
| 1518 | } else { |
| 1519 | spin_lock_bh(&pmc->mca_lock); |
| 1520 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
| 1521 | type = MLD2_MODE_IS_EXCLUDE; |
| 1522 | else |
| 1523 | type = MLD2_MODE_IS_INCLUDE; |
| 1524 | skb = add_grec(skb, pmc, type, 0, 0); |
| 1525 | spin_unlock_bh(&pmc->mca_lock); |
| 1526 | } |
| 1527 | if (skb) |
| 1528 | mld_sendpack(skb); |
| 1529 | } |
| 1530 | |
| 1531 | /* |
| 1532 | * remove zero-count source records from a source filter list |
| 1533 | */ |
| 1534 | static void mld_clear_zeros(struct ip6_sf_list **ppsf) |
| 1535 | { |
| 1536 | struct ip6_sf_list *psf_prev, *psf_next, *psf; |
| 1537 | |
| 1538 | psf_prev = NULL; |
| 1539 | for (psf=*ppsf; psf; psf = psf_next) { |
| 1540 | psf_next = psf->sf_next; |
| 1541 | if (psf->sf_crcount == 0) { |
| 1542 | if (psf_prev) |
| 1543 | psf_prev->sf_next = psf->sf_next; |
| 1544 | else |
| 1545 | *ppsf = psf->sf_next; |
| 1546 | kfree(psf); |
| 1547 | } else |
| 1548 | psf_prev = psf; |
| 1549 | } |
| 1550 | } |
| 1551 | |
| 1552 | static void mld_send_cr(struct inet6_dev *idev) |
| 1553 | { |
| 1554 | struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; |
| 1555 | struct sk_buff *skb = NULL; |
| 1556 | int type, dtype; |
| 1557 | |
| 1558 | read_lock_bh(&idev->lock); |
| 1559 | write_lock_bh(&idev->mc_lock); |
| 1560 | |
| 1561 | /* deleted MCA's */ |
| 1562 | pmc_prev = NULL; |
| 1563 | for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { |
| 1564 | pmc_next = pmc->next; |
| 1565 | if (pmc->mca_sfmode == MCAST_INCLUDE) { |
| 1566 | type = MLD2_BLOCK_OLD_SOURCES; |
| 1567 | dtype = MLD2_BLOCK_OLD_SOURCES; |
| 1568 | skb = add_grec(skb, pmc, type, 1, 0); |
| 1569 | skb = add_grec(skb, pmc, dtype, 1, 1); |
| 1570 | } |
| 1571 | if (pmc->mca_crcount) { |
| 1572 | pmc->mca_crcount--; |
| 1573 | if (pmc->mca_sfmode == MCAST_EXCLUDE) { |
| 1574 | type = MLD2_CHANGE_TO_INCLUDE; |
| 1575 | skb = add_grec(skb, pmc, type, 1, 0); |
| 1576 | } |
| 1577 | if (pmc->mca_crcount == 0) { |
| 1578 | mld_clear_zeros(&pmc->mca_tomb); |
| 1579 | mld_clear_zeros(&pmc->mca_sources); |
| 1580 | } |
| 1581 | } |
| 1582 | if (pmc->mca_crcount == 0 && !pmc->mca_tomb && |
| 1583 | !pmc->mca_sources) { |
| 1584 | if (pmc_prev) |
| 1585 | pmc_prev->next = pmc_next; |
| 1586 | else |
| 1587 | idev->mc_tomb = pmc_next; |
| 1588 | in6_dev_put(pmc->idev); |
| 1589 | kfree(pmc); |
| 1590 | } else |
| 1591 | pmc_prev = pmc; |
| 1592 | } |
| 1593 | write_unlock_bh(&idev->mc_lock); |
| 1594 | |
| 1595 | /* change recs */ |
| 1596 | for (pmc=idev->mc_list; pmc; pmc=pmc->next) { |
| 1597 | spin_lock_bh(&pmc->mca_lock); |
| 1598 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) { |
| 1599 | type = MLD2_BLOCK_OLD_SOURCES; |
| 1600 | dtype = MLD2_ALLOW_NEW_SOURCES; |
| 1601 | } else { |
| 1602 | type = MLD2_ALLOW_NEW_SOURCES; |
| 1603 | dtype = MLD2_BLOCK_OLD_SOURCES; |
| 1604 | } |
| 1605 | skb = add_grec(skb, pmc, type, 0, 0); |
| 1606 | skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ |
| 1607 | |
| 1608 | /* filter mode changes */ |
| 1609 | if (pmc->mca_crcount) { |
| 1610 | pmc->mca_crcount--; |
| 1611 | if (pmc->mca_sfmode == MCAST_EXCLUDE) |
| 1612 | type = MLD2_CHANGE_TO_EXCLUDE; |
| 1613 | else |
| 1614 | type = MLD2_CHANGE_TO_INCLUDE; |
| 1615 | skb = add_grec(skb, pmc, type, 0, 0); |
| 1616 | } |
| 1617 | spin_unlock_bh(&pmc->mca_lock); |
| 1618 | } |
| 1619 | read_unlock_bh(&idev->lock); |
| 1620 | if (!skb) |
| 1621 | return; |
| 1622 | (void) mld_sendpack(skb); |
| 1623 | } |
| 1624 | |
| 1625 | static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) |
| 1626 | { |
| 1627 | struct sock *sk = igmp6_socket->sk; |
| 1628 | struct inet6_dev *idev; |
| 1629 | struct sk_buff *skb; |
| 1630 | struct icmp6hdr *hdr; |
| 1631 | struct in6_addr *snd_addr; |
| 1632 | struct in6_addr *addrp; |
| 1633 | struct in6_addr addr_buf; |
| 1634 | struct in6_addr all_routers; |
| 1635 | int err, len, payload_len, full_len; |
| 1636 | u8 ra[8] = { IPPROTO_ICMPV6, 0, |
| 1637 | IPV6_TLV_ROUTERALERT, 2, 0, 0, |
| 1638 | IPV6_TLV_PADN, 0 }; |
| 1639 | |
| 1640 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); |
| 1641 | snd_addr = addr; |
| 1642 | if (type == ICMPV6_MGM_REDUCTION) { |
| 1643 | snd_addr = &all_routers; |
| 1644 | ipv6_addr_all_routers(&all_routers); |
| 1645 | } |
| 1646 | |
| 1647 | len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); |
| 1648 | payload_len = len + sizeof(ra); |
| 1649 | full_len = sizeof(struct ipv6hdr) + payload_len; |
| 1650 | |
| 1651 | skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); |
| 1652 | |
| 1653 | if (skb == NULL) { |
| 1654 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); |
| 1655 | return; |
| 1656 | } |
| 1657 | |
| 1658 | skb_reserve(skb, LL_RESERVED_SPACE(dev)); |
| 1659 | if (dev->hard_header) { |
| 1660 | unsigned char ha[MAX_ADDR_LEN]; |
| 1661 | ndisc_mc_map(snd_addr, ha, dev, 1); |
| 1662 | if (dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, full_len) < 0) |
| 1663 | goto out; |
| 1664 | } |
| 1665 | |
| 1666 | if (ipv6_get_lladdr(dev, &addr_buf)) { |
| 1667 | /* <draft-ietf-magma-mld-source-05.txt>: |
| 1668 | * use unspecified address as the source address |
| 1669 | * when a valid link-local address is not available. |
| 1670 | */ |
| 1671 | memset(&addr_buf, 0, sizeof(addr_buf)); |
| 1672 | } |
| 1673 | |
| 1674 | ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); |
| 1675 | |
| 1676 | memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); |
| 1677 | |
| 1678 | hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); |
| 1679 | memset(hdr, 0, sizeof(struct icmp6hdr)); |
| 1680 | hdr->icmp6_type = type; |
| 1681 | |
| 1682 | addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); |
| 1683 | ipv6_addr_copy(addrp, addr); |
| 1684 | |
| 1685 | hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, |
| 1686 | IPPROTO_ICMPV6, |
| 1687 | csum_partial((__u8 *) hdr, len, 0)); |
| 1688 | |
| 1689 | idev = in6_dev_get(skb->dev); |
| 1690 | |
| 1691 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, |
| 1692 | dev_queue_xmit); |
| 1693 | if (!err) { |
| 1694 | if (type == ICMPV6_MGM_REDUCTION) |
| 1695 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS); |
| 1696 | else |
| 1697 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES); |
| 1698 | ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); |
| 1699 | IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); |
| 1700 | } else |
| 1701 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); |
| 1702 | |
| 1703 | if (likely(idev != NULL)) |
| 1704 | in6_dev_put(idev); |
| 1705 | return; |
| 1706 | |
| 1707 | out: |
| 1708 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); |
| 1709 | kfree_skb(skb); |
| 1710 | } |
| 1711 | |
| 1712 | static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, |
| 1713 | struct in6_addr *psfsrc) |
| 1714 | { |
| 1715 | struct ip6_sf_list *psf, *psf_prev; |
| 1716 | int rv = 0; |
| 1717 | |
| 1718 | psf_prev = NULL; |
| 1719 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { |
| 1720 | if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) |
| 1721 | break; |
| 1722 | psf_prev = psf; |
| 1723 | } |
| 1724 | if (!psf || psf->sf_count[sfmode] == 0) { |
| 1725 | /* source filter not found, or count wrong => bug */ |
| 1726 | return -ESRCH; |
| 1727 | } |
| 1728 | psf->sf_count[sfmode]--; |
| 1729 | if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { |
| 1730 | struct inet6_dev *idev = pmc->idev; |
| 1731 | |
| 1732 | /* no more filters for this source */ |
| 1733 | if (psf_prev) |
| 1734 | psf_prev->sf_next = psf->sf_next; |
| 1735 | else |
| 1736 | pmc->mca_sources = psf->sf_next; |
| 1737 | if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && |
| 1738 | !MLD_V1_SEEN(idev)) { |
| 1739 | psf->sf_crcount = idev->mc_qrv; |
| 1740 | psf->sf_next = pmc->mca_tomb; |
| 1741 | pmc->mca_tomb = psf; |
| 1742 | rv = 1; |
| 1743 | } else |
| 1744 | kfree(psf); |
| 1745 | } |
| 1746 | return rv; |
| 1747 | } |
| 1748 | |
| 1749 | static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, |
| 1750 | int sfmode, int sfcount, struct in6_addr *psfsrc, |
| 1751 | int delta) |
| 1752 | { |
| 1753 | struct ifmcaddr6 *pmc; |
| 1754 | int changerec = 0; |
| 1755 | int i, err; |
| 1756 | |
| 1757 | if (!idev) |
| 1758 | return -ENODEV; |
| 1759 | read_lock_bh(&idev->lock); |
| 1760 | for (pmc=idev->mc_list; pmc; pmc=pmc->next) { |
| 1761 | if (ipv6_addr_equal(pmca, &pmc->mca_addr)) |
| 1762 | break; |
| 1763 | } |
| 1764 | if (!pmc) { |
| 1765 | /* MCA not found?? bug */ |
| 1766 | read_unlock_bh(&idev->lock); |
| 1767 | return -ESRCH; |
| 1768 | } |
| 1769 | spin_lock_bh(&pmc->mca_lock); |
| 1770 | sf_markstate(pmc); |
| 1771 | if (!delta) { |
| 1772 | if (!pmc->mca_sfcount[sfmode]) { |
| 1773 | spin_unlock_bh(&pmc->mca_lock); |
| 1774 | read_unlock_bh(&idev->lock); |
| 1775 | return -EINVAL; |
| 1776 | } |
| 1777 | pmc->mca_sfcount[sfmode]--; |
| 1778 | } |
| 1779 | err = 0; |
| 1780 | for (i=0; i<sfcount; i++) { |
| 1781 | int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
| 1782 | |
| 1783 | changerec |= rv > 0; |
| 1784 | if (!err && rv < 0) |
| 1785 | err = rv; |
| 1786 | } |
| 1787 | if (pmc->mca_sfmode == MCAST_EXCLUDE && |
| 1788 | pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && |
| 1789 | pmc->mca_sfcount[MCAST_INCLUDE]) { |
| 1790 | struct ip6_sf_list *psf; |
| 1791 | |
| 1792 | /* filter mode change */ |
| 1793 | pmc->mca_sfmode = MCAST_INCLUDE; |
| 1794 | pmc->mca_crcount = idev->mc_qrv; |
| 1795 | idev->mc_ifc_count = pmc->mca_crcount; |
| 1796 | for (psf=pmc->mca_sources; psf; psf = psf->sf_next) |
| 1797 | psf->sf_crcount = 0; |
| 1798 | mld_ifc_event(pmc->idev); |
| 1799 | } else if (sf_setstate(pmc) || changerec) |
| 1800 | mld_ifc_event(pmc->idev); |
| 1801 | spin_unlock_bh(&pmc->mca_lock); |
| 1802 | read_unlock_bh(&idev->lock); |
| 1803 | return err; |
| 1804 | } |
| 1805 | |
| 1806 | /* |
| 1807 | * Add multicast single-source filter to the interface list |
| 1808 | */ |
| 1809 | static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, |
| 1810 | struct in6_addr *psfsrc, int delta) |
| 1811 | { |
| 1812 | struct ip6_sf_list *psf, *psf_prev; |
| 1813 | |
| 1814 | psf_prev = NULL; |
| 1815 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { |
| 1816 | if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) |
| 1817 | break; |
| 1818 | psf_prev = psf; |
| 1819 | } |
| 1820 | if (!psf) { |
| 1821 | psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC); |
| 1822 | if (!psf) |
| 1823 | return -ENOBUFS; |
| 1824 | memset(psf, 0, sizeof(*psf)); |
| 1825 | psf->sf_addr = *psfsrc; |
| 1826 | if (psf_prev) { |
| 1827 | psf_prev->sf_next = psf; |
| 1828 | } else |
| 1829 | pmc->mca_sources = psf; |
| 1830 | } |
| 1831 | psf->sf_count[sfmode]++; |
| 1832 | return 0; |
| 1833 | } |
| 1834 | |
| 1835 | static void sf_markstate(struct ifmcaddr6 *pmc) |
| 1836 | { |
| 1837 | struct ip6_sf_list *psf; |
| 1838 | int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; |
| 1839 | |
| 1840 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) |
| 1841 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) { |
| 1842 | psf->sf_oldin = mca_xcount == |
| 1843 | psf->sf_count[MCAST_EXCLUDE] && |
| 1844 | !psf->sf_count[MCAST_INCLUDE]; |
| 1845 | } else |
| 1846 | psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; |
| 1847 | } |
| 1848 | |
| 1849 | static int sf_setstate(struct ifmcaddr6 *pmc) |
| 1850 | { |
| 1851 | struct ip6_sf_list *psf; |
| 1852 | int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; |
| 1853 | int qrv = pmc->idev->mc_qrv; |
| 1854 | int new_in, rv; |
| 1855 | |
| 1856 | rv = 0; |
| 1857 | for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { |
| 1858 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) { |
| 1859 | new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && |
| 1860 | !psf->sf_count[MCAST_INCLUDE]; |
| 1861 | } else |
| 1862 | new_in = psf->sf_count[MCAST_INCLUDE] != 0; |
| 1863 | if (new_in != psf->sf_oldin) { |
| 1864 | psf->sf_crcount = qrv; |
| 1865 | rv++; |
| 1866 | } |
| 1867 | } |
| 1868 | return rv; |
| 1869 | } |
| 1870 | |
| 1871 | /* |
| 1872 | * Add multicast source filter list to the interface list |
| 1873 | */ |
| 1874 | static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, |
| 1875 | int sfmode, int sfcount, struct in6_addr *psfsrc, |
| 1876 | int delta) |
| 1877 | { |
| 1878 | struct ifmcaddr6 *pmc; |
| 1879 | int isexclude; |
| 1880 | int i, err; |
| 1881 | |
| 1882 | if (!idev) |
| 1883 | return -ENODEV; |
| 1884 | read_lock_bh(&idev->lock); |
| 1885 | for (pmc=idev->mc_list; pmc; pmc=pmc->next) { |
| 1886 | if (ipv6_addr_equal(pmca, &pmc->mca_addr)) |
| 1887 | break; |
| 1888 | } |
| 1889 | if (!pmc) { |
| 1890 | /* MCA not found?? bug */ |
| 1891 | read_unlock_bh(&idev->lock); |
| 1892 | return -ESRCH; |
| 1893 | } |
| 1894 | spin_lock_bh(&pmc->mca_lock); |
| 1895 | |
| 1896 | sf_markstate(pmc); |
| 1897 | isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; |
| 1898 | if (!delta) |
| 1899 | pmc->mca_sfcount[sfmode]++; |
| 1900 | err = 0; |
| 1901 | for (i=0; i<sfcount; i++) { |
| 1902 | err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); |
| 1903 | if (err) |
| 1904 | break; |
| 1905 | } |
| 1906 | if (err) { |
| 1907 | int j; |
| 1908 | |
| 1909 | if (!delta) |
| 1910 | pmc->mca_sfcount[sfmode]--; |
| 1911 | for (j=0; j<i; j++) |
| 1912 | (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); |
| 1913 | } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { |
| 1914 | struct inet6_dev *idev = pmc->idev; |
| 1915 | struct ip6_sf_list *psf; |
| 1916 | |
| 1917 | /* filter mode change */ |
| 1918 | if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
| 1919 | pmc->mca_sfmode = MCAST_EXCLUDE; |
| 1920 | else if (pmc->mca_sfcount[MCAST_INCLUDE]) |
| 1921 | pmc->mca_sfmode = MCAST_INCLUDE; |
| 1922 | /* else no filters; keep old mode for reports */ |
| 1923 | |
| 1924 | pmc->mca_crcount = idev->mc_qrv; |
| 1925 | idev->mc_ifc_count = pmc->mca_crcount; |
| 1926 | for (psf=pmc->mca_sources; psf; psf = psf->sf_next) |
| 1927 | psf->sf_crcount = 0; |
| 1928 | mld_ifc_event(idev); |
| 1929 | } else if (sf_setstate(pmc)) |
| 1930 | mld_ifc_event(idev); |
| 1931 | spin_unlock_bh(&pmc->mca_lock); |
| 1932 | read_unlock_bh(&idev->lock); |
| 1933 | return err; |
| 1934 | } |
| 1935 | |
| 1936 | static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) |
| 1937 | { |
| 1938 | struct ip6_sf_list *psf, *nextpsf; |
| 1939 | |
| 1940 | for (psf=pmc->mca_tomb; psf; psf=nextpsf) { |
| 1941 | nextpsf = psf->sf_next; |
| 1942 | kfree(psf); |
| 1943 | } |
| 1944 | pmc->mca_tomb = NULL; |
| 1945 | for (psf=pmc->mca_sources; psf; psf=nextpsf) { |
| 1946 | nextpsf = psf->sf_next; |
| 1947 | kfree(psf); |
| 1948 | } |
| 1949 | pmc->mca_sources = NULL; |
| 1950 | pmc->mca_sfmode = MCAST_EXCLUDE; |
| 1951 | pmc->mca_sfcount[MCAST_EXCLUDE] = 0; |
| 1952 | pmc->mca_sfcount[MCAST_EXCLUDE] = 1; |
| 1953 | } |
| 1954 | |
| 1955 | |
| 1956 | static void igmp6_join_group(struct ifmcaddr6 *ma) |
| 1957 | { |
| 1958 | unsigned long delay; |
| 1959 | |
| 1960 | if (ma->mca_flags & MAF_NOREPORT) |
| 1961 | return; |
| 1962 | |
| 1963 | igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); |
| 1964 | |
| 1965 | delay = net_random() % IGMP6_UNSOLICITED_IVAL; |
| 1966 | |
| 1967 | spin_lock_bh(&ma->mca_lock); |
| 1968 | if (del_timer(&ma->mca_timer)) { |
| 1969 | atomic_dec(&ma->mca_refcnt); |
| 1970 | delay = ma->mca_timer.expires - jiffies; |
| 1971 | } |
| 1972 | |
| 1973 | if (!mod_timer(&ma->mca_timer, jiffies + delay)) |
| 1974 | atomic_inc(&ma->mca_refcnt); |
| 1975 | ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; |
| 1976 | spin_unlock_bh(&ma->mca_lock); |
| 1977 | } |
| 1978 | |
| 1979 | static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, |
| 1980 | struct inet6_dev *idev) |
| 1981 | { |
| 1982 | int err; |
| 1983 | |
| 1984 | if (iml->sflist == 0) { |
| 1985 | /* any-source empty exclude case */ |
| 1986 | return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); |
| 1987 | } |
| 1988 | err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, |
| 1989 | iml->sflist->sl_count, iml->sflist->sl_addr, 0); |
| 1990 | sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); |
| 1991 | iml->sflist = NULL; |
| 1992 | return err; |
| 1993 | } |
| 1994 | |
| 1995 | static void igmp6_leave_group(struct ifmcaddr6 *ma) |
| 1996 | { |
| 1997 | if (MLD_V1_SEEN(ma->idev)) { |
| 1998 | if (ma->mca_flags & MAF_LAST_REPORTER) |
| 1999 | igmp6_send(&ma->mca_addr, ma->idev->dev, |
| 2000 | ICMPV6_MGM_REDUCTION); |
| 2001 | } else { |
| 2002 | mld_add_delrec(ma->idev, ma); |
| 2003 | mld_ifc_event(ma->idev); |
| 2004 | } |
| 2005 | } |
| 2006 | |
| 2007 | static void mld_gq_timer_expire(unsigned long data) |
| 2008 | { |
| 2009 | struct inet6_dev *idev = (struct inet6_dev *)data; |
| 2010 | |
| 2011 | idev->mc_gq_running = 0; |
| 2012 | mld_send_report(idev, NULL); |
| 2013 | __in6_dev_put(idev); |
| 2014 | } |
| 2015 | |
| 2016 | static void mld_ifc_timer_expire(unsigned long data) |
| 2017 | { |
| 2018 | struct inet6_dev *idev = (struct inet6_dev *)data; |
| 2019 | |
| 2020 | mld_send_cr(idev); |
| 2021 | if (idev->mc_ifc_count) { |
| 2022 | idev->mc_ifc_count--; |
| 2023 | if (idev->mc_ifc_count) |
| 2024 | mld_ifc_start_timer(idev, idev->mc_maxdelay); |
| 2025 | } |
| 2026 | __in6_dev_put(idev); |
| 2027 | } |
| 2028 | |
| 2029 | static void mld_ifc_event(struct inet6_dev *idev) |
| 2030 | { |
| 2031 | if (MLD_V1_SEEN(idev)) |
| 2032 | return; |
| 2033 | idev->mc_ifc_count = idev->mc_qrv; |
| 2034 | mld_ifc_start_timer(idev, 1); |
| 2035 | } |
| 2036 | |
| 2037 | |
| 2038 | static void igmp6_timer_handler(unsigned long data) |
| 2039 | { |
| 2040 | struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; |
| 2041 | |
| 2042 | if (MLD_V1_SEEN(ma->idev)) |
| 2043 | igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); |
| 2044 | else |
| 2045 | mld_send_report(ma->idev, ma); |
| 2046 | |
| 2047 | spin_lock(&ma->mca_lock); |
| 2048 | ma->mca_flags |= MAF_LAST_REPORTER; |
| 2049 | ma->mca_flags &= ~MAF_TIMER_RUNNING; |
| 2050 | spin_unlock(&ma->mca_lock); |
| 2051 | ma_put(ma); |
| 2052 | } |
| 2053 | |
| 2054 | /* Device going down */ |
| 2055 | |
| 2056 | void ipv6_mc_down(struct inet6_dev *idev) |
| 2057 | { |
| 2058 | struct ifmcaddr6 *i; |
| 2059 | |
| 2060 | /* Withdraw multicast list */ |
| 2061 | |
| 2062 | read_lock_bh(&idev->lock); |
| 2063 | idev->mc_ifc_count = 0; |
| 2064 | if (del_timer(&idev->mc_ifc_timer)) |
| 2065 | __in6_dev_put(idev); |
| 2066 | idev->mc_gq_running = 0; |
| 2067 | if (del_timer(&idev->mc_gq_timer)) |
| 2068 | __in6_dev_put(idev); |
| 2069 | |
| 2070 | for (i = idev->mc_list; i; i=i->next) |
| 2071 | igmp6_group_dropped(i); |
| 2072 | read_unlock_bh(&idev->lock); |
| 2073 | |
| 2074 | mld_clear_delrec(idev); |
| 2075 | } |
| 2076 | |
| 2077 | |
| 2078 | /* Device going up */ |
| 2079 | |
| 2080 | void ipv6_mc_up(struct inet6_dev *idev) |
| 2081 | { |
| 2082 | struct ifmcaddr6 *i; |
| 2083 | |
| 2084 | /* Install multicast list, except for all-nodes (already installed) */ |
| 2085 | |
| 2086 | read_lock_bh(&idev->lock); |
| 2087 | for (i = idev->mc_list; i; i=i->next) |
| 2088 | igmp6_group_added(i); |
| 2089 | read_unlock_bh(&idev->lock); |
| 2090 | } |
| 2091 | |
| 2092 | /* IPv6 device initialization. */ |
| 2093 | |
| 2094 | void ipv6_mc_init_dev(struct inet6_dev *idev) |
| 2095 | { |
| 2096 | struct in6_addr maddr; |
| 2097 | |
| 2098 | write_lock_bh(&idev->lock); |
| 2099 | rwlock_init(&idev->mc_lock); |
| 2100 | idev->mc_gq_running = 0; |
| 2101 | init_timer(&idev->mc_gq_timer); |
| 2102 | idev->mc_gq_timer.data = (unsigned long) idev; |
| 2103 | idev->mc_gq_timer.function = &mld_gq_timer_expire; |
| 2104 | idev->mc_tomb = NULL; |
| 2105 | idev->mc_ifc_count = 0; |
| 2106 | init_timer(&idev->mc_ifc_timer); |
| 2107 | idev->mc_ifc_timer.data = (unsigned long) idev; |
| 2108 | idev->mc_ifc_timer.function = &mld_ifc_timer_expire; |
| 2109 | idev->mc_qrv = MLD_QRV_DEFAULT; |
| 2110 | idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; |
| 2111 | idev->mc_v1_seen = 0; |
| 2112 | write_unlock_bh(&idev->lock); |
| 2113 | |
| 2114 | /* Add all-nodes address. */ |
| 2115 | ipv6_addr_all_nodes(&maddr); |
| 2116 | ipv6_dev_mc_inc(idev->dev, &maddr); |
| 2117 | } |
| 2118 | |
| 2119 | /* |
| 2120 | * Device is about to be destroyed: clean up. |
| 2121 | */ |
| 2122 | |
| 2123 | void ipv6_mc_destroy_dev(struct inet6_dev *idev) |
| 2124 | { |
| 2125 | struct ifmcaddr6 *i; |
| 2126 | struct in6_addr maddr; |
| 2127 | |
| 2128 | /* Deactivate timers */ |
| 2129 | ipv6_mc_down(idev); |
| 2130 | |
| 2131 | /* Delete all-nodes address. */ |
| 2132 | ipv6_addr_all_nodes(&maddr); |
| 2133 | |
| 2134 | /* We cannot call ipv6_dev_mc_dec() directly, our caller in |
| 2135 | * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will |
| 2136 | * fail. |
| 2137 | */ |
| 2138 | __ipv6_dev_mc_dec(idev, &maddr); |
| 2139 | |
| 2140 | if (idev->cnf.forwarding) { |
| 2141 | ipv6_addr_all_routers(&maddr); |
| 2142 | __ipv6_dev_mc_dec(idev, &maddr); |
| 2143 | } |
| 2144 | |
| 2145 | write_lock_bh(&idev->lock); |
| 2146 | while ((i = idev->mc_list) != NULL) { |
| 2147 | idev->mc_list = i->next; |
| 2148 | write_unlock_bh(&idev->lock); |
| 2149 | |
| 2150 | igmp6_group_dropped(i); |
| 2151 | ma_put(i); |
| 2152 | |
| 2153 | write_lock_bh(&idev->lock); |
| 2154 | } |
| 2155 | write_unlock_bh(&idev->lock); |
| 2156 | } |
| 2157 | |
| 2158 | #ifdef CONFIG_PROC_FS |
| 2159 | struct igmp6_mc_iter_state { |
| 2160 | struct net_device *dev; |
| 2161 | struct inet6_dev *idev; |
| 2162 | }; |
| 2163 | |
| 2164 | #define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) |
| 2165 | |
| 2166 | static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) |
| 2167 | { |
| 2168 | struct ifmcaddr6 *im = NULL; |
| 2169 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
| 2170 | |
| 2171 | for (state->dev = dev_base, state->idev = NULL; |
| 2172 | state->dev; |
| 2173 | state->dev = state->dev->next) { |
| 2174 | struct inet6_dev *idev; |
| 2175 | idev = in6_dev_get(state->dev); |
| 2176 | if (!idev) |
| 2177 | continue; |
| 2178 | read_lock_bh(&idev->lock); |
| 2179 | im = idev->mc_list; |
| 2180 | if (im) { |
| 2181 | state->idev = idev; |
| 2182 | break; |
| 2183 | } |
| 2184 | read_unlock_bh(&idev->lock); |
| 2185 | in6_dev_put(idev); |
| 2186 | } |
| 2187 | return im; |
| 2188 | } |
| 2189 | |
| 2190 | static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) |
| 2191 | { |
| 2192 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
| 2193 | |
| 2194 | im = im->next; |
| 2195 | while (!im) { |
| 2196 | if (likely(state->idev != NULL)) { |
| 2197 | read_unlock_bh(&state->idev->lock); |
| 2198 | in6_dev_put(state->idev); |
| 2199 | } |
| 2200 | state->dev = state->dev->next; |
| 2201 | if (!state->dev) { |
| 2202 | state->idev = NULL; |
| 2203 | break; |
| 2204 | } |
| 2205 | state->idev = in6_dev_get(state->dev); |
| 2206 | if (!state->idev) |
| 2207 | continue; |
| 2208 | read_lock_bh(&state->idev->lock); |
| 2209 | im = state->idev->mc_list; |
| 2210 | } |
| 2211 | return im; |
| 2212 | } |
| 2213 | |
| 2214 | static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) |
| 2215 | { |
| 2216 | struct ifmcaddr6 *im = igmp6_mc_get_first(seq); |
| 2217 | if (im) |
| 2218 | while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) |
| 2219 | --pos; |
| 2220 | return pos ? NULL : im; |
| 2221 | } |
| 2222 | |
| 2223 | static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) |
| 2224 | { |
| 2225 | read_lock(&dev_base_lock); |
| 2226 | return igmp6_mc_get_idx(seq, *pos); |
| 2227 | } |
| 2228 | |
| 2229 | static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2230 | { |
| 2231 | struct ifmcaddr6 *im; |
| 2232 | im = igmp6_mc_get_next(seq, v); |
| 2233 | ++*pos; |
| 2234 | return im; |
| 2235 | } |
| 2236 | |
| 2237 | static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) |
| 2238 | { |
| 2239 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
| 2240 | if (likely(state->idev != NULL)) { |
| 2241 | read_unlock_bh(&state->idev->lock); |
| 2242 | in6_dev_put(state->idev); |
| 2243 | state->idev = NULL; |
| 2244 | } |
| 2245 | state->dev = NULL; |
| 2246 | read_unlock(&dev_base_lock); |
| 2247 | } |
| 2248 | |
| 2249 | static int igmp6_mc_seq_show(struct seq_file *seq, void *v) |
| 2250 | { |
| 2251 | struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; |
| 2252 | struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
| 2253 | |
| 2254 | seq_printf(seq, |
| 2255 | "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n", |
| 2256 | state->dev->ifindex, state->dev->name, |
| 2257 | NIP6(im->mca_addr), |
| 2258 | im->mca_users, im->mca_flags, |
| 2259 | (im->mca_flags&MAF_TIMER_RUNNING) ? |
| 2260 | jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); |
| 2261 | return 0; |
| 2262 | } |
| 2263 | |
| 2264 | static struct seq_operations igmp6_mc_seq_ops = { |
| 2265 | .start = igmp6_mc_seq_start, |
| 2266 | .next = igmp6_mc_seq_next, |
| 2267 | .stop = igmp6_mc_seq_stop, |
| 2268 | .show = igmp6_mc_seq_show, |
| 2269 | }; |
| 2270 | |
| 2271 | static int igmp6_mc_seq_open(struct inode *inode, struct file *file) |
| 2272 | { |
| 2273 | struct seq_file *seq; |
| 2274 | int rc = -ENOMEM; |
| 2275 | struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 2276 | |
| 2277 | if (!s) |
| 2278 | goto out; |
| 2279 | |
| 2280 | rc = seq_open(file, &igmp6_mc_seq_ops); |
| 2281 | if (rc) |
| 2282 | goto out_kfree; |
| 2283 | |
| 2284 | seq = file->private_data; |
| 2285 | seq->private = s; |
| 2286 | memset(s, 0, sizeof(*s)); |
| 2287 | out: |
| 2288 | return rc; |
| 2289 | out_kfree: |
| 2290 | kfree(s); |
| 2291 | goto out; |
| 2292 | } |
| 2293 | |
| 2294 | static struct file_operations igmp6_mc_seq_fops = { |
| 2295 | .owner = THIS_MODULE, |
| 2296 | .open = igmp6_mc_seq_open, |
| 2297 | .read = seq_read, |
| 2298 | .llseek = seq_lseek, |
| 2299 | .release = seq_release_private, |
| 2300 | }; |
| 2301 | |
| 2302 | struct igmp6_mcf_iter_state { |
| 2303 | struct net_device *dev; |
| 2304 | struct inet6_dev *idev; |
| 2305 | struct ifmcaddr6 *im; |
| 2306 | }; |
| 2307 | |
| 2308 | #define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) |
| 2309 | |
| 2310 | static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) |
| 2311 | { |
| 2312 | struct ip6_sf_list *psf = NULL; |
| 2313 | struct ifmcaddr6 *im = NULL; |
| 2314 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
| 2315 | |
| 2316 | for (state->dev = dev_base, state->idev = NULL, state->im = NULL; |
| 2317 | state->dev; |
| 2318 | state->dev = state->dev->next) { |
| 2319 | struct inet6_dev *idev; |
| 2320 | idev = in6_dev_get(state->dev); |
| 2321 | if (unlikely(idev == NULL)) |
| 2322 | continue; |
| 2323 | read_lock_bh(&idev->lock); |
| 2324 | im = idev->mc_list; |
| 2325 | if (likely(im != NULL)) { |
| 2326 | spin_lock_bh(&im->mca_lock); |
| 2327 | psf = im->mca_sources; |
| 2328 | if (likely(psf != NULL)) { |
| 2329 | state->im = im; |
| 2330 | state->idev = idev; |
| 2331 | break; |
| 2332 | } |
| 2333 | spin_unlock_bh(&im->mca_lock); |
| 2334 | } |
| 2335 | read_unlock_bh(&idev->lock); |
| 2336 | in6_dev_put(idev); |
| 2337 | } |
| 2338 | return psf; |
| 2339 | } |
| 2340 | |
| 2341 | static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) |
| 2342 | { |
| 2343 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
| 2344 | |
| 2345 | psf = psf->sf_next; |
| 2346 | while (!psf) { |
| 2347 | spin_unlock_bh(&state->im->mca_lock); |
| 2348 | state->im = state->im->next; |
| 2349 | while (!state->im) { |
| 2350 | if (likely(state->idev != NULL)) { |
| 2351 | read_unlock_bh(&state->idev->lock); |
| 2352 | in6_dev_put(state->idev); |
| 2353 | } |
| 2354 | state->dev = state->dev->next; |
| 2355 | if (!state->dev) { |
| 2356 | state->idev = NULL; |
| 2357 | goto out; |
| 2358 | } |
| 2359 | state->idev = in6_dev_get(state->dev); |
| 2360 | if (!state->idev) |
| 2361 | continue; |
| 2362 | read_lock_bh(&state->idev->lock); |
| 2363 | state->im = state->idev->mc_list; |
| 2364 | } |
| 2365 | if (!state->im) |
| 2366 | break; |
| 2367 | spin_lock_bh(&state->im->mca_lock); |
| 2368 | psf = state->im->mca_sources; |
| 2369 | } |
| 2370 | out: |
| 2371 | return psf; |
| 2372 | } |
| 2373 | |
| 2374 | static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) |
| 2375 | { |
| 2376 | struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); |
| 2377 | if (psf) |
| 2378 | while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) |
| 2379 | --pos; |
| 2380 | return pos ? NULL : psf; |
| 2381 | } |
| 2382 | |
| 2383 | static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) |
| 2384 | { |
| 2385 | read_lock(&dev_base_lock); |
| 2386 | return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2387 | } |
| 2388 | |
| 2389 | static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2390 | { |
| 2391 | struct ip6_sf_list *psf; |
| 2392 | if (v == SEQ_START_TOKEN) |
| 2393 | psf = igmp6_mcf_get_first(seq); |
| 2394 | else |
| 2395 | psf = igmp6_mcf_get_next(seq, v); |
| 2396 | ++*pos; |
| 2397 | return psf; |
| 2398 | } |
| 2399 | |
| 2400 | static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) |
| 2401 | { |
| 2402 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
| 2403 | if (likely(state->im != NULL)) { |
| 2404 | spin_unlock_bh(&state->im->mca_lock); |
| 2405 | state->im = NULL; |
| 2406 | } |
| 2407 | if (likely(state->idev != NULL)) { |
| 2408 | read_unlock_bh(&state->idev->lock); |
| 2409 | in6_dev_put(state->idev); |
| 2410 | state->idev = NULL; |
| 2411 | } |
| 2412 | state->dev = NULL; |
| 2413 | read_unlock(&dev_base_lock); |
| 2414 | } |
| 2415 | |
| 2416 | static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) |
| 2417 | { |
| 2418 | struct ip6_sf_list *psf = (struct ip6_sf_list *)v; |
| 2419 | struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
| 2420 | |
| 2421 | if (v == SEQ_START_TOKEN) { |
| 2422 | seq_printf(seq, |
| 2423 | "%3s %6s " |
| 2424 | "%32s %32s %6s %6s\n", "Idx", |
| 2425 | "Device", "Multicast Address", |
| 2426 | "Source Address", "INC", "EXC"); |
| 2427 | } else { |
| 2428 | seq_printf(seq, |
| 2429 | "%3d %6.6s " |
| 2430 | "%04x%04x%04x%04x%04x%04x%04x%04x " |
| 2431 | "%04x%04x%04x%04x%04x%04x%04x%04x " |
| 2432 | "%6lu %6lu\n", |
| 2433 | state->dev->ifindex, state->dev->name, |
| 2434 | NIP6(state->im->mca_addr), |
| 2435 | NIP6(psf->sf_addr), |
| 2436 | psf->sf_count[MCAST_INCLUDE], |
| 2437 | psf->sf_count[MCAST_EXCLUDE]); |
| 2438 | } |
| 2439 | return 0; |
| 2440 | } |
| 2441 | |
| 2442 | static struct seq_operations igmp6_mcf_seq_ops = { |
| 2443 | .start = igmp6_mcf_seq_start, |
| 2444 | .next = igmp6_mcf_seq_next, |
| 2445 | .stop = igmp6_mcf_seq_stop, |
| 2446 | .show = igmp6_mcf_seq_show, |
| 2447 | }; |
| 2448 | |
| 2449 | static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) |
| 2450 | { |
| 2451 | struct seq_file *seq; |
| 2452 | int rc = -ENOMEM; |
| 2453 | struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); |
| 2454 | |
| 2455 | if (!s) |
| 2456 | goto out; |
| 2457 | |
| 2458 | rc = seq_open(file, &igmp6_mcf_seq_ops); |
| 2459 | if (rc) |
| 2460 | goto out_kfree; |
| 2461 | |
| 2462 | seq = file->private_data; |
| 2463 | seq->private = s; |
| 2464 | memset(s, 0, sizeof(*s)); |
| 2465 | out: |
| 2466 | return rc; |
| 2467 | out_kfree: |
| 2468 | kfree(s); |
| 2469 | goto out; |
| 2470 | } |
| 2471 | |
| 2472 | static struct file_operations igmp6_mcf_seq_fops = { |
| 2473 | .owner = THIS_MODULE, |
| 2474 | .open = igmp6_mcf_seq_open, |
| 2475 | .read = seq_read, |
| 2476 | .llseek = seq_lseek, |
| 2477 | .release = seq_release_private, |
| 2478 | }; |
| 2479 | #endif |
| 2480 | |
| 2481 | int __init igmp6_init(struct net_proto_family *ops) |
| 2482 | { |
| 2483 | struct ipv6_pinfo *np; |
| 2484 | struct sock *sk; |
| 2485 | int err; |
| 2486 | |
| 2487 | err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket); |
| 2488 | if (err < 0) { |
| 2489 | printk(KERN_ERR |
| 2490 | "Failed to initialize the IGMP6 control socket (err %d).\n", |
| 2491 | err); |
| 2492 | igmp6_socket = NULL; /* For safety. */ |
| 2493 | return err; |
| 2494 | } |
| 2495 | |
| 2496 | sk = igmp6_socket->sk; |
| 2497 | sk->sk_allocation = GFP_ATOMIC; |
| 2498 | sk->sk_prot->unhash(sk); |
| 2499 | |
| 2500 | np = inet6_sk(sk); |
| 2501 | np->hop_limit = 1; |
| 2502 | |
| 2503 | #ifdef CONFIG_PROC_FS |
| 2504 | proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops); |
| 2505 | proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops); |
| 2506 | #endif |
| 2507 | |
| 2508 | return 0; |
| 2509 | } |
| 2510 | |
| 2511 | void igmp6_cleanup(void) |
| 2512 | { |
| 2513 | sock_release(igmp6_socket); |
| 2514 | igmp6_socket = NULL; /* for safety */ |
| 2515 | |
| 2516 | #ifdef CONFIG_PROC_FS |
| 2517 | proc_net_remove("mcfilter6"); |
| 2518 | proc_net_remove("igmp6"); |
| 2519 | #endif |
| 2520 | } |