Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Anycast support for IPv6 |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 3 | * Linux INET6 implementation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Authors: |
| 6 | * David L Stevens (dlstevens@us.ibm.com) |
| 7 | * |
| 8 | * based heavily on net/ipv6/mcast.c |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or (at your option) any later version. |
| 14 | */ |
| 15 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 16 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/module.h> |
| 18 | #include <linux/errno.h> |
| 19 | #include <linux/types.h> |
| 20 | #include <linux/random.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/socket.h> |
| 23 | #include <linux/sockios.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/net.h> |
| 25 | #include <linux/in6.h> |
| 26 | #include <linux/netdevice.h> |
| 27 | #include <linux/if_arp.h> |
| 28 | #include <linux/route.h> |
| 29 | #include <linux/init.h> |
| 30 | #include <linux/proc_fs.h> |
| 31 | #include <linux/seq_file.h> |
| 32 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 33 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <net/sock.h> |
| 35 | #include <net/snmp.h> |
| 36 | |
| 37 | #include <net/ipv6.h> |
| 38 | #include <net/protocol.h> |
| 39 | #include <net/if_inet6.h> |
| 40 | #include <net/ndisc.h> |
| 41 | #include <net/addrconf.h> |
| 42 | #include <net/ip6_route.h> |
| 43 | |
| 44 | #include <net/checksum.h> |
| 45 | |
| 46 | static int ipv6_dev_ac_dec(struct net_device *dev, struct in6_addr *addr); |
| 47 | |
| 48 | /* Big ac list lock for all the sockets */ |
| 49 | static DEFINE_RWLOCK(ipv6_sk_ac_lock); |
| 50 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
| 52 | /* |
| 53 | * socket join an anycast group |
| 54 | */ |
| 55 | |
| 56 | int ipv6_sock_ac_join(struct sock *sk, int ifindex, struct in6_addr *addr) |
| 57 | { |
| 58 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 59 | struct net_device *dev = NULL; |
| 60 | struct inet6_dev *idev; |
| 61 | struct ipv6_ac_socklist *pac; |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 62 | struct net *net = sock_net(sk); |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 63 | int ishost = !net->ipv6.devconf_all->forwarding; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | int err = 0; |
| 65 | |
| 66 | if (!capable(CAP_NET_ADMIN)) |
| 67 | return -EPERM; |
| 68 | if (ipv6_addr_is_multicast(addr)) |
| 69 | return -EINVAL; |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 70 | if (ipv6_chk_addr(net, addr, NULL, 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | return -EINVAL; |
| 72 | |
| 73 | pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL); |
| 74 | if (pac == NULL) |
| 75 | return -ENOMEM; |
| 76 | pac->acl_next = NULL; |
| 77 | ipv6_addr_copy(&pac->acl_addr, addr); |
| 78 | |
| 79 | if (ifindex == 0) { |
| 80 | struct rt6_info *rt; |
| 81 | |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 82 | rt = rt6_lookup(net, addr, NULL, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | if (rt) { |
| 84 | dev = rt->rt6i_dev; |
| 85 | dev_hold(dev); |
| 86 | dst_release(&rt->u.dst); |
| 87 | } else if (ishost) { |
| 88 | err = -EADDRNOTAVAIL; |
| 89 | goto out_free_pac; |
| 90 | } else { |
| 91 | /* router, no matching interface: just pick one */ |
| 92 | |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 93 | dev = dev_get_by_flags(net, IFF_UP, IFF_UP|IFF_LOOPBACK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | } |
| 95 | } else |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 96 | dev = dev_get_by_index(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | |
| 98 | if (dev == NULL) { |
| 99 | err = -ENODEV; |
| 100 | goto out_free_pac; |
| 101 | } |
| 102 | |
| 103 | idev = in6_dev_get(dev); |
| 104 | if (!idev) { |
| 105 | if (ifindex) |
| 106 | err = -ENODEV; |
| 107 | else |
| 108 | err = -EADDRNOTAVAIL; |
| 109 | goto out_dev_put; |
| 110 | } |
| 111 | /* reset ishost, now that we have a specific device */ |
| 112 | ishost = !idev->cnf.forwarding; |
| 113 | in6_dev_put(idev); |
| 114 | |
| 115 | pac->acl_ifindex = dev->ifindex; |
| 116 | |
| 117 | /* XXX |
| 118 | * For hosts, allow link-local or matching prefix anycasts. |
| 119 | * This obviates the need for propagating anycast routes while |
| 120 | * still allowing some non-router anycast participation. |
| 121 | */ |
YOSHIFUJI Hideaki | 52eeeb8 | 2008-03-15 22:54:23 -0400 | [diff] [blame] | 122 | if (!ipv6_chk_prefix(addr, dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | if (ishost) |
| 124 | err = -EADDRNOTAVAIL; |
| 125 | if (err) |
| 126 | goto out_dev_put; |
| 127 | } |
| 128 | |
| 129 | err = ipv6_dev_ac_inc(dev, addr); |
| 130 | if (err) |
| 131 | goto out_dev_put; |
| 132 | |
| 133 | write_lock_bh(&ipv6_sk_ac_lock); |
| 134 | pac->acl_next = np->ipv6_ac_list; |
| 135 | np->ipv6_ac_list = pac; |
| 136 | write_unlock_bh(&ipv6_sk_ac_lock); |
| 137 | |
| 138 | dev_put(dev); |
| 139 | |
| 140 | return 0; |
| 141 | |
| 142 | out_dev_put: |
| 143 | dev_put(dev); |
| 144 | out_free_pac: |
| 145 | sock_kfree_s(sk, pac, sizeof(*pac)); |
| 146 | return err; |
| 147 | } |
| 148 | |
| 149 | /* |
| 150 | * socket leave an anycast group |
| 151 | */ |
| 152 | int ipv6_sock_ac_drop(struct sock *sk, int ifindex, struct in6_addr *addr) |
| 153 | { |
| 154 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 155 | struct net_device *dev; |
| 156 | struct ipv6_ac_socklist *pac, *prev_pac; |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 157 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | write_lock_bh(&ipv6_sk_ac_lock); |
| 160 | prev_pac = NULL; |
| 161 | for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) { |
| 162 | if ((ifindex == 0 || pac->acl_ifindex == ifindex) && |
| 163 | ipv6_addr_equal(&pac->acl_addr, addr)) |
| 164 | break; |
| 165 | prev_pac = pac; |
| 166 | } |
| 167 | if (!pac) { |
| 168 | write_unlock_bh(&ipv6_sk_ac_lock); |
| 169 | return -ENOENT; |
| 170 | } |
| 171 | if (prev_pac) |
| 172 | prev_pac->acl_next = pac->acl_next; |
| 173 | else |
| 174 | np->ipv6_ac_list = pac->acl_next; |
| 175 | |
| 176 | write_unlock_bh(&ipv6_sk_ac_lock); |
| 177 | |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 178 | dev = dev_get_by_index(net, pac->acl_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | if (dev) { |
| 180 | ipv6_dev_ac_dec(dev, &pac->acl_addr); |
| 181 | dev_put(dev); |
| 182 | } |
| 183 | sock_kfree_s(sk, pac, sizeof(*pac)); |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | void ipv6_sock_ac_close(struct sock *sk) |
| 188 | { |
| 189 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 190 | struct net_device *dev = NULL; |
| 191 | struct ipv6_ac_socklist *pac; |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 192 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | int prev_index; |
| 194 | |
| 195 | write_lock_bh(&ipv6_sk_ac_lock); |
| 196 | pac = np->ipv6_ac_list; |
| 197 | np->ipv6_ac_list = NULL; |
| 198 | write_unlock_bh(&ipv6_sk_ac_lock); |
| 199 | |
| 200 | prev_index = 0; |
| 201 | while (pac) { |
| 202 | struct ipv6_ac_socklist *next = pac->acl_next; |
| 203 | |
| 204 | if (pac->acl_ifindex != prev_index) { |
| 205 | if (dev) |
| 206 | dev_put(dev); |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 207 | dev = dev_get_by_index(net, pac->acl_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | prev_index = pac->acl_ifindex; |
| 209 | } |
| 210 | if (dev) |
| 211 | ipv6_dev_ac_dec(dev, &pac->acl_addr); |
| 212 | sock_kfree_s(sk, pac, sizeof(*pac)); |
| 213 | pac = next; |
| 214 | } |
| 215 | if (dev) |
| 216 | dev_put(dev); |
| 217 | } |
| 218 | |
| 219 | #if 0 |
| 220 | /* The function is not used, which is funny. Apparently, author |
| 221 | * supposed to use it to filter out datagrams inside udp/raw but forgot. |
| 222 | * |
| 223 | * It is OK, anycasts are not special comparing to delivery to unicasts. |
| 224 | */ |
| 225 | |
| 226 | int inet6_ac_check(struct sock *sk, struct in6_addr *addr, int ifindex) |
| 227 | { |
| 228 | struct ipv6_ac_socklist *pac; |
| 229 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 230 | int found; |
| 231 | |
| 232 | found = 0; |
| 233 | read_lock(&ipv6_sk_ac_lock); |
| 234 | for (pac=np->ipv6_ac_list; pac; pac=pac->acl_next) { |
| 235 | if (ifindex && pac->acl_ifindex != ifindex) |
| 236 | continue; |
| 237 | found = ipv6_addr_equal(&pac->acl_addr, addr); |
| 238 | if (found) |
| 239 | break; |
| 240 | } |
| 241 | read_unlock(&ipv6_sk_ac_lock); |
| 242 | |
| 243 | return found; |
| 244 | } |
| 245 | |
| 246 | #endif |
| 247 | |
| 248 | static void aca_put(struct ifacaddr6 *ac) |
| 249 | { |
| 250 | if (atomic_dec_and_test(&ac->aca_refcnt)) { |
| 251 | in6_dev_put(ac->aca_idev); |
| 252 | dst_release(&ac->aca_rt->u.dst); |
| 253 | kfree(ac); |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | /* |
| 258 | * device anycast group inc (add if not found) |
| 259 | */ |
| 260 | int ipv6_dev_ac_inc(struct net_device *dev, struct in6_addr *addr) |
| 261 | { |
| 262 | struct ifacaddr6 *aca; |
| 263 | struct inet6_dev *idev; |
| 264 | struct rt6_info *rt; |
| 265 | int err; |
| 266 | |
| 267 | idev = in6_dev_get(dev); |
| 268 | |
| 269 | if (idev == NULL) |
| 270 | return -EINVAL; |
| 271 | |
| 272 | write_lock_bh(&idev->lock); |
| 273 | if (idev->dead) { |
| 274 | err = -ENODEV; |
| 275 | goto out; |
| 276 | } |
| 277 | |
| 278 | for (aca = idev->ac_list; aca; aca = aca->aca_next) { |
| 279 | if (ipv6_addr_equal(&aca->aca_addr, addr)) { |
| 280 | aca->aca_users++; |
| 281 | err = 0; |
| 282 | goto out; |
| 283 | } |
| 284 | } |
| 285 | |
| 286 | /* |
| 287 | * not found: create a new one. |
| 288 | */ |
| 289 | |
Ingo Oeser | 0c600ed | 2006-03-20 23:01:32 -0800 | [diff] [blame] | 290 | aca = kzalloc(sizeof(struct ifacaddr6), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | |
| 292 | if (aca == NULL) { |
| 293 | err = -ENOMEM; |
| 294 | goto out; |
| 295 | } |
| 296 | |
| 297 | rt = addrconf_dst_alloc(idev, addr, 1); |
| 298 | if (IS_ERR(rt)) { |
| 299 | kfree(aca); |
| 300 | err = PTR_ERR(rt); |
| 301 | goto out; |
| 302 | } |
| 303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | ipv6_addr_copy(&aca->aca_addr, addr); |
| 305 | aca->aca_idev = idev; |
| 306 | aca->aca_rt = rt; |
| 307 | aca->aca_users = 1; |
| 308 | /* aca_tstamp should be updated upon changes */ |
| 309 | aca->aca_cstamp = aca->aca_tstamp = jiffies; |
| 310 | atomic_set(&aca->aca_refcnt, 2); |
| 311 | spin_lock_init(&aca->aca_lock); |
| 312 | |
| 313 | aca->aca_next = idev->ac_list; |
| 314 | idev->ac_list = aca; |
| 315 | write_unlock_bh(&idev->lock); |
| 316 | |
Denis V. Lunev | 84f5937 | 2008-04-03 13:33:00 -0700 | [diff] [blame] | 317 | ip6_ins_rt(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | |
| 319 | addrconf_join_solict(dev, &aca->aca_addr); |
| 320 | |
| 321 | aca_put(aca); |
| 322 | return 0; |
| 323 | out: |
| 324 | write_unlock_bh(&idev->lock); |
| 325 | in6_dev_put(idev); |
| 326 | return err; |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | * device anycast group decrement |
| 331 | */ |
| 332 | int __ipv6_dev_ac_dec(struct inet6_dev *idev, struct in6_addr *addr) |
| 333 | { |
| 334 | struct ifacaddr6 *aca, *prev_aca; |
| 335 | |
| 336 | write_lock_bh(&idev->lock); |
| 337 | prev_aca = NULL; |
| 338 | for (aca = idev->ac_list; aca; aca = aca->aca_next) { |
| 339 | if (ipv6_addr_equal(&aca->aca_addr, addr)) |
| 340 | break; |
| 341 | prev_aca = aca; |
| 342 | } |
| 343 | if (!aca) { |
| 344 | write_unlock_bh(&idev->lock); |
| 345 | return -ENOENT; |
| 346 | } |
| 347 | if (--aca->aca_users > 0) { |
| 348 | write_unlock_bh(&idev->lock); |
| 349 | return 0; |
| 350 | } |
| 351 | if (prev_aca) |
| 352 | prev_aca->aca_next = aca->aca_next; |
| 353 | else |
| 354 | idev->ac_list = aca->aca_next; |
| 355 | write_unlock_bh(&idev->lock); |
| 356 | addrconf_leave_solict(idev, &aca->aca_addr); |
| 357 | |
| 358 | dst_hold(&aca->aca_rt->u.dst); |
Denis V. Lunev | 84f5937 | 2008-04-03 13:33:00 -0700 | [diff] [blame] | 359 | ip6_del_rt(aca->aca_rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | |
| 361 | aca_put(aca); |
| 362 | return 0; |
| 363 | } |
| 364 | |
| 365 | static int ipv6_dev_ac_dec(struct net_device *dev, struct in6_addr *addr) |
| 366 | { |
| 367 | int ret; |
| 368 | struct inet6_dev *idev = in6_dev_get(dev); |
| 369 | if (idev == NULL) |
| 370 | return -ENODEV; |
| 371 | ret = __ipv6_dev_ac_dec(idev, addr); |
| 372 | in6_dev_put(idev); |
| 373 | return ret; |
| 374 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 375 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | /* |
| 377 | * check if the interface has this anycast address |
| 378 | */ |
| 379 | static int ipv6_chk_acast_dev(struct net_device *dev, struct in6_addr *addr) |
| 380 | { |
| 381 | struct inet6_dev *idev; |
| 382 | struct ifacaddr6 *aca; |
| 383 | |
| 384 | idev = in6_dev_get(dev); |
| 385 | if (idev) { |
| 386 | read_lock_bh(&idev->lock); |
| 387 | for (aca = idev->ac_list; aca; aca = aca->aca_next) |
| 388 | if (ipv6_addr_equal(&aca->aca_addr, addr)) |
| 389 | break; |
| 390 | read_unlock_bh(&idev->lock); |
| 391 | in6_dev_put(idev); |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 392 | return aca != NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | } |
| 394 | return 0; |
| 395 | } |
| 396 | |
| 397 | /* |
| 398 | * check if given interface (or any, if dev==0) has this anycast address |
| 399 | */ |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 400 | int ipv6_chk_acast_addr(struct net *net, struct net_device *dev, |
| 401 | struct in6_addr *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | { |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 403 | int found = 0; |
| 404 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | if (dev) |
| 406 | return ipv6_chk_acast_dev(dev, addr); |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 407 | rcu_read_lock(); |
| 408 | for_each_netdev_rcu(net, dev) |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 409 | if (ipv6_chk_acast_dev(dev, addr)) { |
| 410 | found = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | break; |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 412 | } |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 413 | rcu_read_unlock(); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 414 | return found; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | } |
| 416 | |
| 417 | |
| 418 | #ifdef CONFIG_PROC_FS |
| 419 | struct ac6_iter_state { |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 420 | struct seq_net_private p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | struct net_device *dev; |
| 422 | struct inet6_dev *idev; |
| 423 | }; |
| 424 | |
| 425 | #define ac6_seq_private(seq) ((struct ac6_iter_state *)(seq)->private) |
| 426 | |
| 427 | static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq) |
| 428 | { |
| 429 | struct ifacaddr6 *im = NULL; |
| 430 | struct ac6_iter_state *state = ac6_seq_private(seq); |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 431 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 433 | state->idev = NULL; |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 434 | for_each_netdev_rcu(net, state->dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | struct inet6_dev *idev; |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 436 | idev = __in6_dev_get(state->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | if (!idev) |
| 438 | continue; |
| 439 | read_lock_bh(&idev->lock); |
| 440 | im = idev->ac_list; |
| 441 | if (im) { |
| 442 | state->idev = idev; |
| 443 | break; |
| 444 | } |
| 445 | read_unlock_bh(&idev->lock); |
| 446 | } |
| 447 | return im; |
| 448 | } |
| 449 | |
| 450 | static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im) |
| 451 | { |
| 452 | struct ac6_iter_state *state = ac6_seq_private(seq); |
| 453 | |
| 454 | im = im->aca_next; |
| 455 | while (!im) { |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 456 | if (likely(state->idev != NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | read_unlock_bh(&state->idev->lock); |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 458 | |
| 459 | state->dev = next_net_device_rcu(state->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | if (!state->dev) { |
| 461 | state->idev = NULL; |
| 462 | break; |
| 463 | } |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 464 | state->idev = __in6_dev_get(state->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | if (!state->idev) |
| 466 | continue; |
| 467 | read_lock_bh(&state->idev->lock); |
| 468 | im = state->idev->ac_list; |
| 469 | } |
| 470 | return im; |
| 471 | } |
| 472 | |
| 473 | static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos) |
| 474 | { |
| 475 | struct ifacaddr6 *im = ac6_get_first(seq); |
| 476 | if (im) |
| 477 | while (pos && (im = ac6_get_next(seq, im)) != NULL) |
| 478 | --pos; |
| 479 | return pos ? NULL : im; |
| 480 | } |
| 481 | |
| 482 | static void *ac6_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 483 | __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | { |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 485 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | return ac6_get_idx(seq, *pos); |
| 487 | } |
| 488 | |
| 489 | static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 490 | { |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 491 | struct ifacaddr6 *im = ac6_get_next(seq, v); |
| 492 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | ++*pos; |
| 494 | return im; |
| 495 | } |
| 496 | |
| 497 | static void ac6_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 498 | __releases(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | { |
| 500 | struct ac6_iter_state *state = ac6_seq_private(seq); |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 501 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | if (likely(state->idev != NULL)) { |
| 503 | read_unlock_bh(&state->idev->lock); |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 504 | state->idev = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | } |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 506 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | } |
| 508 | |
| 509 | static int ac6_seq_show(struct seq_file *seq, void *v) |
| 510 | { |
| 511 | struct ifacaddr6 *im = (struct ifacaddr6 *)v; |
| 512 | struct ac6_iter_state *state = ac6_seq_private(seq); |
| 513 | |
Harvey Harrison | 4b7a427 | 2008-10-29 12:50:24 -0700 | [diff] [blame] | 514 | seq_printf(seq, "%-4d %-15s %pi6 %5d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | state->dev->ifindex, state->dev->name, |
Harvey Harrison | b071195 | 2008-10-28 16:05:40 -0700 | [diff] [blame] | 516 | &im->aca_addr, im->aca_users); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | return 0; |
| 518 | } |
| 519 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 520 | static const struct seq_operations ac6_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | .start = ac6_seq_start, |
| 522 | .next = ac6_seq_next, |
| 523 | .stop = ac6_seq_stop, |
| 524 | .show = ac6_seq_show, |
| 525 | }; |
| 526 | |
| 527 | static int ac6_seq_open(struct inode *inode, struct file *file) |
| 528 | { |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 529 | return seq_open_net(inode, file, &ac6_seq_ops, |
| 530 | sizeof(struct ac6_iter_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | } |
| 532 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 533 | static const struct file_operations ac6_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | .owner = THIS_MODULE, |
| 535 | .open = ac6_seq_open, |
| 536 | .read = seq_read, |
| 537 | .llseek = seq_lseek, |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 538 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | }; |
| 540 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 541 | int __net_init ac6_proc_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | { |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 543 | if (!proc_net_fops_create(net, "anycast6", S_IRUGO, &ac6_seq_fops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | return -ENOMEM; |
| 545 | |
| 546 | return 0; |
| 547 | } |
| 548 | |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 549 | void ac6_proc_exit(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | { |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 551 | proc_net_remove(net, "anycast6"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | } |
| 553 | #endif |
| 554 | |