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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 32 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 34 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <net/sock.h> |
| 36 | #include <net/snmp.h> |
| 37 | |
| 38 | #include <net/ipv6.h> |
| 39 | #include <net/protocol.h> |
| 40 | #include <net/if_inet6.h> |
| 41 | #include <net/ndisc.h> |
| 42 | #include <net/addrconf.h> |
| 43 | #include <net/ip6_route.h> |
| 44 | |
| 45 | #include <net/checksum.h> |
| 46 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 47 | static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | /* |
| 50 | * socket join an anycast group |
| 51 | */ |
| 52 | |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 53 | int ipv6_sock_ac_join(struct sock *sk, int ifindex, const struct in6_addr *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | { |
| 55 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 56 | struct net_device *dev = NULL; |
| 57 | struct inet6_dev *idev; |
| 58 | struct ipv6_ac_socklist *pac; |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 59 | struct net *net = sock_net(sk); |
YOSHIFUJI Hideaki | 53b7997 | 2008-07-19 22:35:03 -0700 | [diff] [blame] | 60 | int ishost = !net->ipv6.devconf_all->forwarding; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | int err = 0; |
| 62 | |
Eric W. Biederman | af31f41 | 2012-11-16 03:03:06 +0000 | [diff] [blame] | 63 | if (!ns_capable(net->user_ns, CAP_NET_ADMIN)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | return -EPERM; |
| 65 | if (ipv6_addr_is_multicast(addr)) |
| 66 | return -EINVAL; |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 67 | if (ipv6_chk_addr(net, addr, NULL, 0)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | return -EINVAL; |
| 69 | |
| 70 | pac = sock_kmalloc(sk, sizeof(struct ipv6_ac_socklist), GFP_KERNEL); |
| 71 | if (pac == NULL) |
| 72 | return -ENOMEM; |
| 73 | pac->acl_next = NULL; |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 74 | pac->acl_addr = *addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
Sabrina Dubroca | a9ed4a2 | 2014-09-02 10:29:29 +0200 | [diff] [blame] | 76 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | if (ifindex == 0) { |
| 78 | struct rt6_info *rt; |
| 79 | |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 80 | rt = rt6_lookup(net, addr, NULL, 0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | if (rt) { |
David S. Miller | d191854 | 2011-12-28 20:19:20 -0500 | [diff] [blame] | 82 | dev = rt->dst.dev; |
Amerigo Wang | 94e187c | 2012-10-29 00:13:19 +0000 | [diff] [blame] | 83 | ip6_rt_put(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | } else if (ishost) { |
| 85 | err = -EADDRNOTAVAIL; |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 86 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | } else { |
| 88 | /* router, no matching interface: just pick one */ |
WANG Cong | 6c55549 | 2014-09-11 15:35:09 -0700 | [diff] [blame] | 89 | dev = __dev_get_by_flags(net, IFF_UP, |
| 90 | IFF_UP | IFF_LOOPBACK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | } |
| 92 | } else |
WANG Cong | 6c55549 | 2014-09-11 15:35:09 -0700 | [diff] [blame] | 93 | dev = __dev_get_by_index(net, ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | if (dev == NULL) { |
| 96 | err = -ENODEV; |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 97 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | } |
| 99 | |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 100 | idev = __in6_dev_get(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | if (!idev) { |
| 102 | if (ifindex) |
| 103 | err = -ENODEV; |
| 104 | else |
| 105 | err = -EADDRNOTAVAIL; |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 106 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | } |
| 108 | /* reset ishost, now that we have a specific device */ |
| 109 | ishost = !idev->cnf.forwarding; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
| 111 | pac->acl_ifindex = dev->ifindex; |
| 112 | |
| 113 | /* XXX |
| 114 | * For hosts, allow link-local or matching prefix anycasts. |
| 115 | * This obviates the need for propagating anycast routes while |
| 116 | * still allowing some non-router anycast participation. |
| 117 | */ |
YOSHIFUJI Hideaki | 52eeeb8 | 2008-03-15 22:54:23 -0400 | [diff] [blame] | 118 | if (!ipv6_chk_prefix(addr, dev)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | if (ishost) |
| 120 | err = -EADDRNOTAVAIL; |
| 121 | if (err) |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 122 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | err = ipv6_dev_ac_inc(dev, addr); |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 126 | if (!err) { |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 127 | pac->acl_next = np->ipv6_ac_list; |
| 128 | np->ipv6_ac_list = pac; |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 129 | pac = NULL; |
| 130 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 132 | error: |
Sabrina Dubroca | a9ed4a2 | 2014-09-02 10:29:29 +0200 | [diff] [blame] | 133 | rtnl_unlock(); |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 134 | if (pac) |
| 135 | sock_kfree_s(sk, pac, sizeof(*pac)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | return err; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * socket leave an anycast group |
| 141 | */ |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 142 | int ipv6_sock_ac_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | { |
| 144 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 145 | struct net_device *dev; |
| 146 | struct ipv6_ac_socklist *pac, *prev_pac; |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 147 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
WANG Cong | b03a9c0 | 2014-09-11 15:35:10 -0700 | [diff] [blame^] | 149 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | prev_pac = NULL; |
| 151 | for (pac = np->ipv6_ac_list; pac; pac = pac->acl_next) { |
| 152 | if ((ifindex == 0 || pac->acl_ifindex == ifindex) && |
| 153 | ipv6_addr_equal(&pac->acl_addr, addr)) |
| 154 | break; |
| 155 | prev_pac = pac; |
| 156 | } |
| 157 | if (!pac) { |
WANG Cong | b03a9c0 | 2014-09-11 15:35:10 -0700 | [diff] [blame^] | 158 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | return -ENOENT; |
| 160 | } |
| 161 | if (prev_pac) |
| 162 | prev_pac->acl_next = pac->acl_next; |
| 163 | else |
| 164 | np->ipv6_ac_list = pac->acl_next; |
| 165 | |
WANG Cong | 6c55549 | 2014-09-11 15:35:09 -0700 | [diff] [blame] | 166 | dev = __dev_get_by_index(net, pac->acl_ifindex); |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 167 | if (dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | ipv6_dev_ac_dec(dev, &pac->acl_addr); |
Sabrina Dubroca | a9ed4a2 | 2014-09-02 10:29:29 +0200 | [diff] [blame] | 169 | rtnl_unlock(); |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | sock_kfree_s(sk, pac, sizeof(*pac)); |
| 172 | return 0; |
| 173 | } |
| 174 | |
| 175 | void ipv6_sock_ac_close(struct sock *sk) |
| 176 | { |
| 177 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 178 | struct net_device *dev = NULL; |
| 179 | struct ipv6_ac_socklist *pac; |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 180 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | int prev_index; |
| 182 | |
Eric Dumazet | 0e1efe9 | 2012-12-05 09:18:10 +0000 | [diff] [blame] | 183 | if (!np->ipv6_ac_list) |
| 184 | return; |
| 185 | |
WANG Cong | b03a9c0 | 2014-09-11 15:35:10 -0700 | [diff] [blame^] | 186 | rtnl_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | pac = np->ipv6_ac_list; |
| 188 | np->ipv6_ac_list = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
| 190 | prev_index = 0; |
| 191 | while (pac) { |
| 192 | struct ipv6_ac_socklist *next = pac->acl_next; |
| 193 | |
| 194 | if (pac->acl_ifindex != prev_index) { |
WANG Cong | 6c55549 | 2014-09-11 15:35:09 -0700 | [diff] [blame] | 195 | dev = __dev_get_by_index(net, pac->acl_ifindex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | prev_index = pac->acl_ifindex; |
| 197 | } |
| 198 | if (dev) |
| 199 | ipv6_dev_ac_dec(dev, &pac->acl_addr); |
| 200 | sock_kfree_s(sk, pac, sizeof(*pac)); |
| 201 | pac = next; |
| 202 | } |
Sabrina Dubroca | a9ed4a2 | 2014-09-02 10:29:29 +0200 | [diff] [blame] | 203 | rtnl_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | } |
| 205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | static void aca_put(struct ifacaddr6 *ac) |
| 207 | { |
| 208 | if (atomic_dec_and_test(&ac->aca_refcnt)) { |
| 209 | in6_dev_put(ac->aca_idev); |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 210 | dst_release(&ac->aca_rt->dst); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | kfree(ac); |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * device anycast group inc (add if not found) |
| 217 | */ |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 218 | int ipv6_dev_ac_inc(struct net_device *dev, const struct in6_addr *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | { |
| 220 | struct ifacaddr6 *aca; |
| 221 | struct inet6_dev *idev; |
| 222 | struct rt6_info *rt; |
| 223 | int err; |
| 224 | |
Sabrina Dubroca | a9ed4a2 | 2014-09-02 10:29:29 +0200 | [diff] [blame] | 225 | ASSERT_RTNL(); |
| 226 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | idev = in6_dev_get(dev); |
| 228 | |
| 229 | if (idev == NULL) |
| 230 | return -EINVAL; |
| 231 | |
| 232 | write_lock_bh(&idev->lock); |
| 233 | if (idev->dead) { |
| 234 | err = -ENODEV; |
| 235 | goto out; |
| 236 | } |
| 237 | |
| 238 | for (aca = idev->ac_list; aca; aca = aca->aca_next) { |
| 239 | if (ipv6_addr_equal(&aca->aca_addr, addr)) { |
| 240 | aca->aca_users++; |
| 241 | err = 0; |
| 242 | goto out; |
| 243 | } |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * not found: create a new one. |
| 248 | */ |
| 249 | |
Ingo Oeser | 0c600ed | 2006-03-20 23:01:32 -0800 | [diff] [blame] | 250 | aca = kzalloc(sizeof(struct ifacaddr6), GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | |
| 252 | if (aca == NULL) { |
| 253 | err = -ENOMEM; |
| 254 | goto out; |
| 255 | } |
| 256 | |
David S. Miller | 8f03151 | 2011-12-06 16:48:14 -0500 | [diff] [blame] | 257 | rt = addrconf_dst_alloc(idev, addr, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | if (IS_ERR(rt)) { |
| 259 | kfree(aca); |
| 260 | err = PTR_ERR(rt); |
| 261 | goto out; |
| 262 | } |
| 263 | |
Alexey Dobriyan | 4e3fd7a | 2011-11-21 03:39:03 +0000 | [diff] [blame] | 264 | aca->aca_addr = *addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | aca->aca_idev = idev; |
| 266 | aca->aca_rt = rt; |
| 267 | aca->aca_users = 1; |
| 268 | /* aca_tstamp should be updated upon changes */ |
| 269 | aca->aca_cstamp = aca->aca_tstamp = jiffies; |
| 270 | atomic_set(&aca->aca_refcnt, 2); |
| 271 | spin_lock_init(&aca->aca_lock); |
| 272 | |
| 273 | aca->aca_next = idev->ac_list; |
| 274 | idev->ac_list = aca; |
| 275 | write_unlock_bh(&idev->lock); |
| 276 | |
Denis V. Lunev | 84f5937 | 2008-04-03 13:33:00 -0700 | [diff] [blame] | 277 | ip6_ins_rt(rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
| 279 | addrconf_join_solict(dev, &aca->aca_addr); |
| 280 | |
| 281 | aca_put(aca); |
| 282 | return 0; |
| 283 | out: |
| 284 | write_unlock_bh(&idev->lock); |
| 285 | in6_dev_put(idev); |
| 286 | return err; |
| 287 | } |
| 288 | |
| 289 | /* |
| 290 | * device anycast group decrement |
| 291 | */ |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 292 | int __ipv6_dev_ac_dec(struct inet6_dev *idev, const struct in6_addr *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | { |
| 294 | struct ifacaddr6 *aca, *prev_aca; |
| 295 | |
Sabrina Dubroca | a9ed4a2 | 2014-09-02 10:29:29 +0200 | [diff] [blame] | 296 | ASSERT_RTNL(); |
| 297 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | write_lock_bh(&idev->lock); |
| 299 | prev_aca = NULL; |
| 300 | for (aca = idev->ac_list; aca; aca = aca->aca_next) { |
| 301 | if (ipv6_addr_equal(&aca->aca_addr, addr)) |
| 302 | break; |
| 303 | prev_aca = aca; |
| 304 | } |
| 305 | if (!aca) { |
| 306 | write_unlock_bh(&idev->lock); |
| 307 | return -ENOENT; |
| 308 | } |
| 309 | if (--aca->aca_users > 0) { |
| 310 | write_unlock_bh(&idev->lock); |
| 311 | return 0; |
| 312 | } |
| 313 | if (prev_aca) |
| 314 | prev_aca->aca_next = aca->aca_next; |
| 315 | else |
| 316 | idev->ac_list = aca->aca_next; |
| 317 | write_unlock_bh(&idev->lock); |
| 318 | addrconf_leave_solict(idev, &aca->aca_addr); |
| 319 | |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 320 | dst_hold(&aca->aca_rt->dst); |
Denis V. Lunev | 84f5937 | 2008-04-03 13:33:00 -0700 | [diff] [blame] | 321 | ip6_del_rt(aca->aca_rt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
| 323 | aca_put(aca); |
| 324 | return 0; |
| 325 | } |
| 326 | |
WANG Cong | 6c55549 | 2014-09-11 15:35:09 -0700 | [diff] [blame] | 327 | /* called with rtnl_lock() */ |
Eric Dumazet | b71d1d4 | 2011-04-22 04:53:02 +0000 | [diff] [blame] | 328 | static int ipv6_dev_ac_dec(struct net_device *dev, const struct in6_addr *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | { |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 330 | struct inet6_dev *idev = __in6_dev_get(dev); |
| 331 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | if (idev == NULL) |
| 333 | return -ENODEV; |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 334 | return __ipv6_dev_ac_dec(idev, addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | } |
YOSHIFUJI Hideaki | 1ab1457 | 2007-02-09 23:24:49 +0900 | [diff] [blame] | 336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | /* |
| 338 | * check if the interface has this anycast address |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 339 | * called with rcu_read_lock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 340 | */ |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 341 | static bool ipv6_chk_acast_dev(struct net_device *dev, const struct in6_addr *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | { |
| 343 | struct inet6_dev *idev; |
| 344 | struct ifacaddr6 *aca; |
| 345 | |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 346 | idev = __in6_dev_get(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | if (idev) { |
| 348 | read_lock_bh(&idev->lock); |
| 349 | for (aca = idev->ac_list; aca; aca = aca->aca_next) |
| 350 | if (ipv6_addr_equal(&aca->aca_addr, addr)) |
| 351 | break; |
| 352 | read_unlock_bh(&idev->lock); |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 353 | return aca != NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | } |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 355 | return false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | /* |
| 359 | * check if given interface (or any, if dev==0) has this anycast address |
| 360 | */ |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 361 | bool ipv6_chk_acast_addr(struct net *net, struct net_device *dev, |
| 362 | const struct in6_addr *addr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | { |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 364 | bool found = false; |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 365 | |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 366 | rcu_read_lock(); |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 367 | if (dev) |
| 368 | found = ipv6_chk_acast_dev(dev, addr); |
| 369 | else |
| 370 | for_each_netdev_rcu(net, dev) |
| 371 | if (ipv6_chk_acast_dev(dev, addr)) { |
Eric Dumazet | a50feda | 2012-05-18 18:57:34 +0000 | [diff] [blame] | 372 | found = true; |
Eric Dumazet | bb69ae0 | 2010-06-07 11:42:13 +0000 | [diff] [blame] | 373 | break; |
| 374 | } |
Eric Dumazet | c6d14c8 | 2009-11-04 05:43:23 -0800 | [diff] [blame] | 375 | rcu_read_unlock(); |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 376 | return found; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | } |
| 378 | |
FX Le Bail | 7c90cc2 | 2014-01-22 07:42:37 +0100 | [diff] [blame] | 379 | /* check if this anycast address is link-local on given interface or |
| 380 | * is global |
| 381 | */ |
| 382 | bool ipv6_chk_acast_addr_src(struct net *net, struct net_device *dev, |
| 383 | const struct in6_addr *addr) |
| 384 | { |
| 385 | return ipv6_chk_acast_addr(net, |
| 386 | (ipv6_addr_type(addr) & IPV6_ADDR_LINKLOCAL ? |
| 387 | dev : NULL), |
| 388 | addr); |
| 389 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
| 391 | #ifdef CONFIG_PROC_FS |
| 392 | struct ac6_iter_state { |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 393 | struct seq_net_private p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 394 | struct net_device *dev; |
| 395 | struct inet6_dev *idev; |
| 396 | }; |
| 397 | |
| 398 | #define ac6_seq_private(seq) ((struct ac6_iter_state *)(seq)->private) |
| 399 | |
| 400 | static inline struct ifacaddr6 *ac6_get_first(struct seq_file *seq) |
| 401 | { |
| 402 | struct ifacaddr6 *im = NULL; |
| 403 | struct ac6_iter_state *state = ac6_seq_private(seq); |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 404 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 406 | state->idev = NULL; |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 407 | for_each_netdev_rcu(net, state->dev) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | struct inet6_dev *idev; |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 409 | idev = __in6_dev_get(state->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | if (!idev) |
| 411 | continue; |
| 412 | read_lock_bh(&idev->lock); |
| 413 | im = idev->ac_list; |
| 414 | if (im) { |
| 415 | state->idev = idev; |
| 416 | break; |
| 417 | } |
| 418 | read_unlock_bh(&idev->lock); |
| 419 | } |
| 420 | return im; |
| 421 | } |
| 422 | |
| 423 | static struct ifacaddr6 *ac6_get_next(struct seq_file *seq, struct ifacaddr6 *im) |
| 424 | { |
| 425 | struct ac6_iter_state *state = ac6_seq_private(seq); |
| 426 | |
| 427 | im = im->aca_next; |
| 428 | while (!im) { |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 429 | if (likely(state->idev != NULL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | read_unlock_bh(&state->idev->lock); |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 431 | |
| 432 | state->dev = next_net_device_rcu(state->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | if (!state->dev) { |
| 434 | state->idev = NULL; |
| 435 | break; |
| 436 | } |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 437 | state->idev = __in6_dev_get(state->dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | if (!state->idev) |
| 439 | continue; |
| 440 | read_lock_bh(&state->idev->lock); |
| 441 | im = state->idev->ac_list; |
| 442 | } |
| 443 | return im; |
| 444 | } |
| 445 | |
| 446 | static struct ifacaddr6 *ac6_get_idx(struct seq_file *seq, loff_t pos) |
| 447 | { |
| 448 | struct ifacaddr6 *im = ac6_get_first(seq); |
| 449 | if (im) |
| 450 | while (pos && (im = ac6_get_next(seq, im)) != NULL) |
| 451 | --pos; |
| 452 | return pos ? NULL : im; |
| 453 | } |
| 454 | |
| 455 | static void *ac6_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 456 | __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | { |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 458 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | return ac6_get_idx(seq, *pos); |
| 460 | } |
| 461 | |
| 462 | static void *ac6_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 463 | { |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 464 | struct ifacaddr6 *im = ac6_get_next(seq, v); |
| 465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | ++*pos; |
| 467 | return im; |
| 468 | } |
| 469 | |
| 470 | static void ac6_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 471 | __releases(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | { |
| 473 | struct ac6_iter_state *state = ac6_seq_private(seq); |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 474 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | if (likely(state->idev != NULL)) { |
| 476 | read_unlock_bh(&state->idev->lock); |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 477 | state->idev = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | } |
Eric Dumazet | ce81b76 | 2009-11-11 17:34:30 +0000 | [diff] [blame] | 479 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | static int ac6_seq_show(struct seq_file *seq, void *v) |
| 483 | { |
| 484 | struct ifacaddr6 *im = (struct ifacaddr6 *)v; |
| 485 | struct ac6_iter_state *state = ac6_seq_private(seq); |
| 486 | |
Harvey Harrison | 4b7a427 | 2008-10-29 12:50:24 -0700 | [diff] [blame] | 487 | seq_printf(seq, "%-4d %-15s %pi6 %5d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | state->dev->ifindex, state->dev->name, |
Harvey Harrison | b071195 | 2008-10-28 16:05:40 -0700 | [diff] [blame] | 489 | &im->aca_addr, im->aca_users); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | return 0; |
| 491 | } |
| 492 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 493 | static const struct seq_operations ac6_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | .start = ac6_seq_start, |
| 495 | .next = ac6_seq_next, |
| 496 | .stop = ac6_seq_stop, |
| 497 | .show = ac6_seq_show, |
| 498 | }; |
| 499 | |
| 500 | static int ac6_seq_open(struct inode *inode, struct file *file) |
| 501 | { |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 502 | return seq_open_net(inode, file, &ac6_seq_ops, |
| 503 | sizeof(struct ac6_iter_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | } |
| 505 | |
Arjan van de Ven | 9a32144 | 2007-02-12 00:55:35 -0800 | [diff] [blame] | 506 | static const struct file_operations ac6_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | .owner = THIS_MODULE, |
| 508 | .open = ac6_seq_open, |
| 509 | .read = seq_read, |
| 510 | .llseek = seq_lseek, |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 511 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | }; |
| 513 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 514 | int __net_init ac6_proc_init(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | { |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 516 | if (!proc_create("anycast6", S_IRUGO, net->proc_net, &ac6_seq_fops)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | return -ENOMEM; |
| 518 | |
| 519 | return 0; |
| 520 | } |
| 521 | |
Daniel Lezcano | 6ab57e7 | 2008-03-26 16:52:32 -0700 | [diff] [blame] | 522 | void ac6_proc_exit(struct net *net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 523 | { |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 524 | remove_proc_entry("anycast6", net->proc_net); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | } |
| 526 | #endif |
| 527 | |