Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NETLINK Kernel-user communication protocol. |
| 3 | * |
Alan Cox | 113aa83 | 2008-10-13 19:01:08 -0700 | [diff] [blame] | 4 | * Authors: Alan Cox <alan@lxorguk.ukuu.org.uk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 11 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * Tue Jun 26 14:36:48 MEST 2001 Herbert "herp" Rosmanith |
| 13 | * added netlink_proto_exit |
| 14 | * Tue Jan 22 18:32:44 BRST 2002 Arnaldo C. de Melo <acme@conectiva.com.br> |
| 15 | * use nlk_sk, as sk->protinfo is on a diet 8) |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 16 | * Fri Jul 22 19:51:12 MEST 2005 Harald Welte <laforge@gnumonks.org> |
| 17 | * - inc module use count of module that owns |
| 18 | * the kernel socket in case userspace opens |
| 19 | * socket of same protocol |
| 20 | * - remove all module support, since netlink is |
| 21 | * mandatory if CONFIG_NET=y these days |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | */ |
| 23 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/module.h> |
| 25 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 26 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/kernel.h> |
| 28 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/signal.h> |
| 30 | #include <linux/sched.h> |
| 31 | #include <linux/errno.h> |
| 32 | #include <linux/string.h> |
| 33 | #include <linux/stat.h> |
| 34 | #include <linux/socket.h> |
| 35 | #include <linux/un.h> |
| 36 | #include <linux/fcntl.h> |
| 37 | #include <linux/termios.h> |
| 38 | #include <linux/sockios.h> |
| 39 | #include <linux/net.h> |
| 40 | #include <linux/fs.h> |
| 41 | #include <linux/slab.h> |
| 42 | #include <asm/uaccess.h> |
| 43 | #include <linux/skbuff.h> |
| 44 | #include <linux/netdevice.h> |
| 45 | #include <linux/rtnetlink.h> |
| 46 | #include <linux/proc_fs.h> |
| 47 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <linux/notifier.h> |
| 49 | #include <linux/security.h> |
| 50 | #include <linux/jhash.h> |
| 51 | #include <linux/jiffies.h> |
| 52 | #include <linux/random.h> |
| 53 | #include <linux/bitops.h> |
| 54 | #include <linux/mm.h> |
| 55 | #include <linux/types.h> |
Andrew Morton | 54e0f52 | 2005-04-30 07:07:04 +0100 | [diff] [blame] | 56 | #include <linux/audit.h> |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 57 | #include <linux/mutex.h> |
Andrew Morton | 54e0f52 | 2005-04-30 07:07:04 +0100 | [diff] [blame] | 58 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 59 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | #include <net/sock.h> |
| 61 | #include <net/scm.h> |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 62 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 64 | #include "af_netlink.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 66 | struct listeners { |
| 67 | struct rcu_head rcu; |
| 68 | unsigned long masks[0]; |
Johannes Berg | 6c04bb1 | 2009-07-10 09:51:32 +0000 | [diff] [blame] | 69 | }; |
| 70 | |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 71 | /* state bits */ |
| 72 | #define NETLINK_CONGESTED 0x0 |
| 73 | |
| 74 | /* flags */ |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 75 | #define NETLINK_KERNEL_SOCKET 0x1 |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 76 | #define NETLINK_RECV_PKTINFO 0x2 |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 77 | #define NETLINK_BROADCAST_SEND_ERROR 0x4 |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 78 | #define NETLINK_RECV_NO_ENOBUFS 0x8 |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 79 | |
David S. Miller | 035c4c1 | 2011-12-23 17:33:03 -0500 | [diff] [blame] | 80 | static inline int netlink_is_kernel(struct sock *sk) |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 81 | { |
| 82 | return nlk_sk(sk)->flags & NETLINK_KERNEL_SOCKET; |
| 83 | } |
| 84 | |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 85 | struct netlink_table *nl_table; |
| 86 | EXPORT_SYMBOL_GPL(nl_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | |
| 88 | static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait); |
| 89 | |
| 90 | static int netlink_dump(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 92 | DEFINE_RWLOCK(nl_table_lock); |
| 93 | EXPORT_SYMBOL_GPL(nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | static atomic_t nl_table_users = ATOMIC_INIT(0); |
| 95 | |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 96 | #define nl_deref_protected(X) rcu_dereference_protected(X, lockdep_is_held(&nl_table_lock)); |
| 97 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 98 | static ATOMIC_NOTIFIER_HEAD(netlink_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 100 | static inline u32 netlink_group_mask(u32 group) |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 101 | { |
| 102 | return group ? 1 << (group - 1) : 0; |
| 103 | } |
| 104 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 105 | static inline struct hlist_head *nl_portid_hashfn(struct nl_portid_hash *hash, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 107 | return &hash->table[jhash_1word(portid, hash->rnd) & hash->mask]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | } |
| 109 | |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 110 | static void netlink_destroy_callback(struct netlink_callback *cb) |
| 111 | { |
| 112 | kfree_skb(cb->skb); |
| 113 | kfree(cb); |
| 114 | } |
| 115 | |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 116 | static void netlink_consume_callback(struct netlink_callback *cb) |
| 117 | { |
| 118 | consume_skb(cb->skb); |
| 119 | kfree(cb); |
| 120 | } |
| 121 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | static void netlink_sock_destruct(struct sock *sk) |
| 123 | { |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 124 | struct netlink_sock *nlk = nlk_sk(sk); |
| 125 | |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 126 | if (nlk->cb) { |
| 127 | if (nlk->cb->done) |
| 128 | nlk->cb->done(nlk->cb); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 129 | |
| 130 | module_put(nlk->cb->module); |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 131 | netlink_destroy_callback(nlk->cb); |
| 132 | } |
| 133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | skb_queue_purge(&sk->sk_receive_queue); |
| 135 | |
| 136 | if (!sock_flag(sk, SOCK_DEAD)) { |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 137 | printk(KERN_ERR "Freeing alive netlink socket %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | return; |
| 139 | } |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 140 | |
| 141 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| 142 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
| 143 | WARN_ON(nlk_sk(sk)->groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | } |
| 145 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 146 | /* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on |
| 147 | * SMP. Look, when several writers sleep and reader wakes them up, all but one |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | * immediately hit write lock and grab all the cpus. Exclusive sleep solves |
| 149 | * this, _but_ remember, it adds useless work on UP machines. |
| 150 | */ |
| 151 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 152 | void netlink_table_grab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 153 | __acquires(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 155 | might_sleep(); |
| 156 | |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 157 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | |
| 159 | if (atomic_read(&nl_table_users)) { |
| 160 | DECLARE_WAITQUEUE(wait, current); |
| 161 | |
| 162 | add_wait_queue_exclusive(&nl_table_wait, &wait); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 163 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 165 | if (atomic_read(&nl_table_users) == 0) |
| 166 | break; |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 167 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | schedule(); |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 169 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | __set_current_state(TASK_RUNNING); |
| 173 | remove_wait_queue(&nl_table_wait, &wait); |
| 174 | } |
| 175 | } |
| 176 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 177 | void netlink_table_ungrab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 178 | __releases(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | { |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 180 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | wake_up(&nl_table_wait); |
| 182 | } |
| 183 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 184 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | netlink_lock_table(void) |
| 186 | { |
| 187 | /* read_lock() synchronizes us to netlink_table_grab */ |
| 188 | |
| 189 | read_lock(&nl_table_lock); |
| 190 | atomic_inc(&nl_table_users); |
| 191 | read_unlock(&nl_table_lock); |
| 192 | } |
| 193 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 194 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | netlink_unlock_table(void) |
| 196 | { |
| 197 | if (atomic_dec_and_test(&nl_table_users)) |
| 198 | wake_up(&nl_table_wait); |
| 199 | } |
| 200 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 201 | static struct sock *netlink_lookup(struct net *net, int protocol, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 203 | struct nl_portid_hash *hash = &nl_table[protocol].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | struct hlist_head *head; |
| 205 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
| 207 | read_lock(&nl_table_lock); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 208 | head = nl_portid_hashfn(hash, portid); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 209 | sk_for_each(sk, head) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 210 | if (net_eq(sock_net(sk), net) && (nlk_sk(sk)->portid == portid)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | sock_hold(sk); |
| 212 | goto found; |
| 213 | } |
| 214 | } |
| 215 | sk = NULL; |
| 216 | found: |
| 217 | read_unlock(&nl_table_lock); |
| 218 | return sk; |
| 219 | } |
| 220 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 221 | static struct hlist_head *nl_portid_hash_zalloc(size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | { |
| 223 | if (size <= PAGE_SIZE) |
Eric Dumazet | ea72912 | 2007-12-11 02:09:47 -0800 | [diff] [blame] | 224 | return kzalloc(size, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | else |
| 226 | return (struct hlist_head *) |
Eric Dumazet | ea72912 | 2007-12-11 02:09:47 -0800 | [diff] [blame] | 227 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
| 228 | get_order(size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 231 | static void nl_portid_hash_free(struct hlist_head *table, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | { |
| 233 | if (size <= PAGE_SIZE) |
| 234 | kfree(table); |
| 235 | else |
| 236 | free_pages((unsigned long)table, get_order(size)); |
| 237 | } |
| 238 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 239 | static int nl_portid_hash_rehash(struct nl_portid_hash *hash, int grow) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | { |
| 241 | unsigned int omask, mask, shift; |
| 242 | size_t osize, size; |
| 243 | struct hlist_head *otable, *table; |
| 244 | int i; |
| 245 | |
| 246 | omask = mask = hash->mask; |
| 247 | osize = size = (mask + 1) * sizeof(*table); |
| 248 | shift = hash->shift; |
| 249 | |
| 250 | if (grow) { |
| 251 | if (++shift > hash->max_shift) |
| 252 | return 0; |
| 253 | mask = mask * 2 + 1; |
| 254 | size *= 2; |
| 255 | } |
| 256 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 257 | table = nl_portid_hash_zalloc(size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | if (!table) |
| 259 | return 0; |
| 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | otable = hash->table; |
| 262 | hash->table = table; |
| 263 | hash->mask = mask; |
| 264 | hash->shift = shift; |
| 265 | get_random_bytes(&hash->rnd, sizeof(hash->rnd)); |
| 266 | |
| 267 | for (i = 0; i <= omask; i++) { |
| 268 | struct sock *sk; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 269 | struct hlist_node *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 271 | sk_for_each_safe(sk, tmp, &otable[i]) |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 272 | __sk_add_node(sk, nl_portid_hashfn(hash, nlk_sk(sk)->portid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | } |
| 274 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 275 | nl_portid_hash_free(otable, osize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | hash->rehash_time = jiffies + 10 * 60 * HZ; |
| 277 | return 1; |
| 278 | } |
| 279 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 280 | static inline int nl_portid_hash_dilute(struct nl_portid_hash *hash, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | { |
| 282 | int avg = hash->entries >> hash->shift; |
| 283 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 284 | if (unlikely(avg > 1) && nl_portid_hash_rehash(hash, 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | return 1; |
| 286 | |
| 287 | if (unlikely(len > avg) && time_after(jiffies, hash->rehash_time)) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 288 | nl_portid_hash_rehash(hash, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | return 1; |
| 290 | } |
| 291 | |
| 292 | return 0; |
| 293 | } |
| 294 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 295 | static const struct proto_ops netlink_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 297 | static void |
| 298 | netlink_update_listeners(struct sock *sk) |
| 299 | { |
| 300 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 301 | unsigned long mask; |
| 302 | unsigned int i; |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 303 | struct listeners *listeners; |
| 304 | |
| 305 | listeners = nl_deref_protected(tbl->listeners); |
| 306 | if (!listeners) |
| 307 | return; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 308 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 309 | for (i = 0; i < NLGRPLONGS(tbl->groups); i++) { |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 310 | mask = 0; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 311 | sk_for_each_bound(sk, &tbl->mc_list) { |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 312 | if (i < NLGRPLONGS(nlk_sk(sk)->ngroups)) |
| 313 | mask |= nlk_sk(sk)->groups[i]; |
| 314 | } |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 315 | listeners->masks[i] = mask; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 316 | } |
| 317 | /* this function is only called with the netlink table "grabbed", which |
| 318 | * makes sure updates are visible before bind or setsockopt return. */ |
| 319 | } |
| 320 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 321 | static int netlink_insert(struct sock *sk, struct net *net, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 323 | struct nl_portid_hash *hash = &nl_table[sk->sk_protocol].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | struct hlist_head *head; |
| 325 | int err = -EADDRINUSE; |
| 326 | struct sock *osk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | int len; |
| 328 | |
| 329 | netlink_table_grab(); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 330 | head = nl_portid_hashfn(hash, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | len = 0; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 332 | sk_for_each(osk, head) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 333 | if (net_eq(sock_net(osk), net) && (nlk_sk(osk)->portid == portid)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | break; |
| 335 | len++; |
| 336 | } |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 337 | if (osk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | goto err; |
| 339 | |
| 340 | err = -EBUSY; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 341 | if (nlk_sk(sk)->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | goto err; |
| 343 | |
| 344 | err = -ENOMEM; |
| 345 | if (BITS_PER_LONG > 32 && unlikely(hash->entries >= UINT_MAX)) |
| 346 | goto err; |
| 347 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 348 | if (len && nl_portid_hash_dilute(hash, len)) |
| 349 | head = nl_portid_hashfn(hash, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | hash->entries++; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 351 | nlk_sk(sk)->portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | sk_add_node(sk, head); |
| 353 | err = 0; |
| 354 | |
| 355 | err: |
| 356 | netlink_table_ungrab(); |
| 357 | return err; |
| 358 | } |
| 359 | |
| 360 | static void netlink_remove(struct sock *sk) |
| 361 | { |
| 362 | netlink_table_grab(); |
David S. Miller | d470e3b | 2005-06-26 15:31:51 -0700 | [diff] [blame] | 363 | if (sk_del_node_init(sk)) |
| 364 | nl_table[sk->sk_protocol].hash.entries--; |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 365 | if (nlk_sk(sk)->subscriptions) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | __sk_del_bind_node(sk); |
| 367 | netlink_table_ungrab(); |
| 368 | } |
| 369 | |
| 370 | static struct proto netlink_proto = { |
| 371 | .name = "NETLINK", |
| 372 | .owner = THIS_MODULE, |
| 373 | .obj_size = sizeof(struct netlink_sock), |
| 374 | }; |
| 375 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 376 | static int __netlink_create(struct net *net, struct socket *sock, |
| 377 | struct mutex *cb_mutex, int protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | { |
| 379 | struct sock *sk; |
| 380 | struct netlink_sock *nlk; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 381 | |
| 382 | sock->ops = &netlink_ops; |
| 383 | |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 384 | sk = sk_alloc(net, PF_NETLINK, GFP_KERNEL, &netlink_proto); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 385 | if (!sk) |
| 386 | return -ENOMEM; |
| 387 | |
| 388 | sock_init_data(sock, sk); |
| 389 | |
| 390 | nlk = nlk_sk(sk); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 391 | if (cb_mutex) { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 392 | nlk->cb_mutex = cb_mutex; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 393 | } else { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 394 | nlk->cb_mutex = &nlk->cb_def_mutex; |
| 395 | mutex_init(nlk->cb_mutex); |
| 396 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 397 | init_waitqueue_head(&nlk->wait); |
| 398 | |
| 399 | sk->sk_destruct = netlink_sock_destruct; |
| 400 | sk->sk_protocol = protocol; |
| 401 | return 0; |
| 402 | } |
| 403 | |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 404 | static int netlink_create(struct net *net, struct socket *sock, int protocol, |
| 405 | int kern) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 406 | { |
| 407 | struct module *module = NULL; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 408 | struct mutex *cb_mutex; |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 409 | struct netlink_sock *nlk; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 410 | void (*bind)(int group); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 411 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
| 413 | sock->state = SS_UNCONNECTED; |
| 414 | |
| 415 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) |
| 416 | return -ESOCKTNOSUPPORT; |
| 417 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 418 | if (protocol < 0 || protocol >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | return -EPROTONOSUPPORT; |
| 420 | |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 421 | netlink_lock_table(); |
Johannes Berg | 95a5afc | 2008-10-16 15:24:51 -0700 | [diff] [blame] | 422 | #ifdef CONFIG_MODULES |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 423 | if (!nl_table[protocol].registered) { |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 424 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 425 | request_module("net-pf-%d-proto-%d", PF_NETLINK, protocol); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 426 | netlink_lock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 427 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 428 | #endif |
| 429 | if (nl_table[protocol].registered && |
| 430 | try_module_get(nl_table[protocol].module)) |
| 431 | module = nl_table[protocol].module; |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 432 | else |
| 433 | err = -EPROTONOSUPPORT; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 434 | cb_mutex = nl_table[protocol].cb_mutex; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 435 | bind = nl_table[protocol].bind; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 436 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 437 | |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 438 | if (err < 0) |
| 439 | goto out; |
| 440 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 441 | err = __netlink_create(net, sock, cb_mutex, protocol); |
| 442 | if (err < 0) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 443 | goto out_module; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 445 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 446 | sock_prot_inuse_add(net, &netlink_proto, 1); |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 447 | local_bh_enable(); |
| 448 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 449 | nlk = nlk_sk(sock->sk); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 450 | nlk->module = module; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 451 | nlk->netlink_bind = bind; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 452 | out: |
| 453 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 455 | out_module: |
| 456 | module_put(module); |
| 457 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | } |
| 459 | |
| 460 | static int netlink_release(struct socket *sock) |
| 461 | { |
| 462 | struct sock *sk = sock->sk; |
| 463 | struct netlink_sock *nlk; |
| 464 | |
| 465 | if (!sk) |
| 466 | return 0; |
| 467 | |
| 468 | netlink_remove(sk); |
Denis Lunev | ac57b3a | 2007-04-18 17:05:58 -0700 | [diff] [blame] | 469 | sock_orphan(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | nlk = nlk_sk(sk); |
| 471 | |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 472 | /* |
| 473 | * OK. Socket is unlinked, any packets that arrive now |
| 474 | * will be purged. |
| 475 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | sock->sk = NULL; |
| 478 | wake_up_interruptible_all(&nlk->wait); |
| 479 | |
| 480 | skb_queue_purge(&sk->sk_write_queue); |
| 481 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 482 | if (nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | struct netlink_notify n = { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 484 | .net = sock_net(sk), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | .protocol = sk->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 486 | .portid = nlk->portid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | }; |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 488 | atomic_notifier_call_chain(&netlink_chain, |
| 489 | NETLINK_URELEASE, &n); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 490 | } |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 491 | |
Mariusz Kozlowski | 5e7c001 | 2007-01-02 15:24:30 -0800 | [diff] [blame] | 492 | module_put(nlk->module); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 493 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 494 | netlink_table_grab(); |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 495 | if (netlink_is_kernel(sk)) { |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 496 | BUG_ON(nl_table[sk->sk_protocol].registered == 0); |
| 497 | if (--nl_table[sk->sk_protocol].registered == 0) { |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 498 | struct listeners *old; |
| 499 | |
| 500 | old = nl_deref_protected(nl_table[sk->sk_protocol].listeners); |
| 501 | RCU_INIT_POINTER(nl_table[sk->sk_protocol].listeners, NULL); |
| 502 | kfree_rcu(old, rcu); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 503 | nl_table[sk->sk_protocol].module = NULL; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 504 | nl_table[sk->sk_protocol].bind = NULL; |
| 505 | nl_table[sk->sk_protocol].flags = 0; |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 506 | nl_table[sk->sk_protocol].registered = 0; |
| 507 | } |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 508 | } else if (nlk->subscriptions) { |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 509 | netlink_update_listeners(sk); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 510 | } |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 511 | netlink_table_ungrab(); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 512 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 513 | kfree(nlk->groups); |
| 514 | nlk->groups = NULL; |
| 515 | |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 516 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 517 | sock_prot_inuse_add(sock_net(sk), &netlink_proto, -1); |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 518 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | sock_put(sk); |
| 520 | return 0; |
| 521 | } |
| 522 | |
| 523 | static int netlink_autobind(struct socket *sock) |
| 524 | { |
| 525 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 526 | struct net *net = sock_net(sk); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 527 | struct nl_portid_hash *hash = &nl_table[sk->sk_protocol].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | struct hlist_head *head; |
| 529 | struct sock *osk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 530 | s32 portid = task_tgid_vnr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | int err; |
| 532 | static s32 rover = -4097; |
| 533 | |
| 534 | retry: |
| 535 | cond_resched(); |
| 536 | netlink_table_grab(); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 537 | head = nl_portid_hashfn(hash, portid); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 538 | sk_for_each(osk, head) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 539 | if (!net_eq(sock_net(osk), net)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 540 | continue; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 541 | if (nlk_sk(osk)->portid == portid) { |
| 542 | /* Bind collision, search negative portid values. */ |
| 543 | portid = rover--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | if (rover > -4097) |
| 545 | rover = -4097; |
| 546 | netlink_table_ungrab(); |
| 547 | goto retry; |
| 548 | } |
| 549 | } |
| 550 | netlink_table_ungrab(); |
| 551 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 552 | err = netlink_insert(sk, net, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | if (err == -EADDRINUSE) |
| 554 | goto retry; |
David S. Miller | d470e3b | 2005-06-26 15:31:51 -0700 | [diff] [blame] | 555 | |
| 556 | /* If 2 threads race to autobind, that is fine. */ |
| 557 | if (err == -EBUSY) |
| 558 | err = 0; |
| 559 | |
| 560 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | } |
| 562 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 563 | static inline int netlink_capable(const struct socket *sock, unsigned int flag) |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 564 | { |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 565 | return (nl_table[sock->sk->sk_protocol].flags & flag) || |
Eric W. Biederman | df008c9 | 2012-11-16 03:03:07 +0000 | [diff] [blame] | 566 | ns_capable(sock_net(sock->sk)->user_ns, CAP_NET_ADMIN); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 567 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 569 | static void |
| 570 | netlink_update_subscriptions(struct sock *sk, unsigned int subscriptions) |
| 571 | { |
| 572 | struct netlink_sock *nlk = nlk_sk(sk); |
| 573 | |
| 574 | if (nlk->subscriptions && !subscriptions) |
| 575 | __sk_del_bind_node(sk); |
| 576 | else if (!nlk->subscriptions && subscriptions) |
| 577 | sk_add_bind_node(sk, &nl_table[sk->sk_protocol].mc_list); |
| 578 | nlk->subscriptions = subscriptions; |
| 579 | } |
| 580 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 581 | static int netlink_realloc_groups(struct sock *sk) |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 582 | { |
| 583 | struct netlink_sock *nlk = nlk_sk(sk); |
| 584 | unsigned int groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 585 | unsigned long *new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 586 | int err = 0; |
| 587 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 588 | netlink_table_grab(); |
| 589 | |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 590 | groups = nl_table[sk->sk_protocol].groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 591 | if (!nl_table[sk->sk_protocol].registered) { |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 592 | err = -ENOENT; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 593 | goto out_unlock; |
| 594 | } |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 595 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 596 | if (nlk->ngroups >= groups) |
| 597 | goto out_unlock; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 598 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 599 | new_groups = krealloc(nlk->groups, NLGRPSZ(groups), GFP_ATOMIC); |
| 600 | if (new_groups == NULL) { |
| 601 | err = -ENOMEM; |
| 602 | goto out_unlock; |
| 603 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 604 | memset((char *)new_groups + NLGRPSZ(nlk->ngroups), 0, |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 605 | NLGRPSZ(groups) - NLGRPSZ(nlk->ngroups)); |
| 606 | |
| 607 | nlk->groups = new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 608 | nlk->ngroups = groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 609 | out_unlock: |
| 610 | netlink_table_ungrab(); |
| 611 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 612 | } |
| 613 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 614 | static int netlink_bind(struct socket *sock, struct sockaddr *addr, |
| 615 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | { |
| 617 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 618 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | struct netlink_sock *nlk = nlk_sk(sk); |
| 620 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
| 621 | int err; |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 622 | |
Hannes Frederic Sowa | 4e4b537 | 2012-12-15 15:42:19 +0000 | [diff] [blame] | 623 | if (addr_len < sizeof(struct sockaddr_nl)) |
| 624 | return -EINVAL; |
| 625 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | if (nladdr->nl_family != AF_NETLINK) |
| 627 | return -EINVAL; |
| 628 | |
| 629 | /* Only superuser is allowed to listen multicasts */ |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 630 | if (nladdr->nl_groups) { |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 631 | if (!netlink_capable(sock, NL_CFG_F_NONROOT_RECV)) |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 632 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 633 | err = netlink_realloc_groups(sk); |
| 634 | if (err) |
| 635 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 636 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 638 | if (nlk->portid) { |
| 639 | if (nladdr->nl_pid != nlk->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | return -EINVAL; |
| 641 | } else { |
| 642 | err = nladdr->nl_pid ? |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 643 | netlink_insert(sk, net, nladdr->nl_pid) : |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | netlink_autobind(sock); |
| 645 | if (err) |
| 646 | return err; |
| 647 | } |
| 648 | |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 649 | if (!nladdr->nl_groups && (nlk->groups == NULL || !(u32)nlk->groups[0])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | return 0; |
| 651 | |
| 652 | netlink_table_grab(); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 653 | netlink_update_subscriptions(sk, nlk->subscriptions + |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 654 | hweight32(nladdr->nl_groups) - |
| 655 | hweight32(nlk->groups[0])); |
| 656 | nlk->groups[0] = (nlk->groups[0] & ~0xffffffffUL) | nladdr->nl_groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 657 | netlink_update_listeners(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | netlink_table_ungrab(); |
| 659 | |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 660 | if (nlk->netlink_bind && nlk->groups[0]) { |
| 661 | int i; |
| 662 | |
| 663 | for (i=0; i<nlk->ngroups; i++) { |
| 664 | if (test_bit(i, nlk->groups)) |
| 665 | nlk->netlink_bind(i); |
| 666 | } |
| 667 | } |
| 668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | return 0; |
| 670 | } |
| 671 | |
| 672 | static int netlink_connect(struct socket *sock, struct sockaddr *addr, |
| 673 | int alen, int flags) |
| 674 | { |
| 675 | int err = 0; |
| 676 | struct sock *sk = sock->sk; |
| 677 | struct netlink_sock *nlk = nlk_sk(sk); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 678 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
Changli Gao | 6503d96 | 2010-03-31 22:58:26 +0000 | [diff] [blame] | 680 | if (alen < sizeof(addr->sa_family)) |
| 681 | return -EINVAL; |
| 682 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | if (addr->sa_family == AF_UNSPEC) { |
| 684 | sk->sk_state = NETLINK_UNCONNECTED; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 685 | nlk->dst_portid = 0; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 686 | nlk->dst_group = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | return 0; |
| 688 | } |
| 689 | if (addr->sa_family != AF_NETLINK) |
| 690 | return -EINVAL; |
| 691 | |
| 692 | /* Only superuser is allowed to send multicasts */ |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 693 | if (nladdr->nl_groups && !netlink_capable(sock, NL_CFG_F_NONROOT_SEND)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | return -EPERM; |
| 695 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 696 | if (!nlk->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | err = netlink_autobind(sock); |
| 698 | |
| 699 | if (err == 0) { |
| 700 | sk->sk_state = NETLINK_CONNECTED; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 701 | nlk->dst_portid = nladdr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 702 | nlk->dst_group = ffs(nladdr->nl_groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | } |
| 704 | |
| 705 | return err; |
| 706 | } |
| 707 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 708 | static int netlink_getname(struct socket *sock, struct sockaddr *addr, |
| 709 | int *addr_len, int peer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | { |
| 711 | struct sock *sk = sock->sk; |
| 712 | struct netlink_sock *nlk = nlk_sk(sk); |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 713 | DECLARE_SOCKADDR(struct sockaddr_nl *, nladdr, addr); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | nladdr->nl_family = AF_NETLINK; |
| 716 | nladdr->nl_pad = 0; |
| 717 | *addr_len = sizeof(*nladdr); |
| 718 | |
| 719 | if (peer) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 720 | nladdr->nl_pid = nlk->dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 721 | nladdr->nl_groups = netlink_group_mask(nlk->dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | } else { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 723 | nladdr->nl_pid = nlk->portid; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 724 | nladdr->nl_groups = nlk->groups ? nlk->groups[0] : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | } |
| 726 | return 0; |
| 727 | } |
| 728 | |
| 729 | static void netlink_overrun(struct sock *sk) |
| 730 | { |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 731 | struct netlink_sock *nlk = nlk_sk(sk); |
| 732 | |
| 733 | if (!(nlk->flags & NETLINK_RECV_NO_ENOBUFS)) { |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 734 | if (!test_and_set_bit(NETLINK_CONGESTED, &nlk_sk(sk)->state)) { |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 735 | sk->sk_err = ENOBUFS; |
| 736 | sk->sk_error_report(sk); |
| 737 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | } |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 739 | atomic_inc(&sk->sk_drops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | } |
| 741 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 742 | static struct sock *netlink_getsockbyportid(struct sock *ssk, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | struct sock *sock; |
| 745 | struct netlink_sock *nlk; |
| 746 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 747 | sock = netlink_lookup(sock_net(ssk), ssk->sk_protocol, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | if (!sock) |
| 749 | return ERR_PTR(-ECONNREFUSED); |
| 750 | |
| 751 | /* Don't bother queuing skb if kernel socket has no input function */ |
| 752 | nlk = nlk_sk(sock); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 753 | if (sock->sk_state == NETLINK_CONNECTED && |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 754 | nlk->dst_portid != nlk_sk(ssk)->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | sock_put(sock); |
| 756 | return ERR_PTR(-ECONNREFUSED); |
| 757 | } |
| 758 | return sock; |
| 759 | } |
| 760 | |
| 761 | struct sock *netlink_getsockbyfilp(struct file *filp) |
| 762 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 763 | struct inode *inode = file_inode(filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | struct sock *sock; |
| 765 | |
| 766 | if (!S_ISSOCK(inode->i_mode)) |
| 767 | return ERR_PTR(-ENOTSOCK); |
| 768 | |
| 769 | sock = SOCKET_I(inode)->sk; |
| 770 | if (sock->sk_family != AF_NETLINK) |
| 771 | return ERR_PTR(-EINVAL); |
| 772 | |
| 773 | sock_hold(sock); |
| 774 | return sock; |
| 775 | } |
| 776 | |
| 777 | /* |
| 778 | * Attach a skb to a netlink socket. |
| 779 | * The caller must hold a reference to the destination socket. On error, the |
| 780 | * reference is dropped. The skb is not send to the destination, just all |
| 781 | * all error checks are performed and memory in the queue is reserved. |
| 782 | * Return values: |
| 783 | * < 0: error. skb freed, reference to sock dropped. |
| 784 | * 0: continue |
| 785 | * 1: repeat lookup - reference dropped while waiting for socket memory. |
| 786 | */ |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 787 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 788 | long *timeo, struct sock *ssk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | { |
| 790 | struct netlink_sock *nlk; |
| 791 | |
| 792 | nlk = nlk_sk(sk); |
| 793 | |
| 794 | if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 795 | test_bit(NETLINK_CONGESTED, &nlk->state)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | DECLARE_WAITQUEUE(wait, current); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 797 | if (!*timeo) { |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 798 | if (!ssk || netlink_is_kernel(ssk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | netlink_overrun(sk); |
| 800 | sock_put(sk); |
| 801 | kfree_skb(skb); |
| 802 | return -EAGAIN; |
| 803 | } |
| 804 | |
| 805 | __set_current_state(TASK_INTERRUPTIBLE); |
| 806 | add_wait_queue(&nlk->wait, &wait); |
| 807 | |
| 808 | if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 809 | test_bit(NETLINK_CONGESTED, &nlk->state)) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | !sock_flag(sk, SOCK_DEAD)) |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 811 | *timeo = schedule_timeout(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | |
| 813 | __set_current_state(TASK_RUNNING); |
| 814 | remove_wait_queue(&nlk->wait, &wait); |
| 815 | sock_put(sk); |
| 816 | |
| 817 | if (signal_pending(current)) { |
| 818 | kfree_skb(skb); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 819 | return sock_intr_errno(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | } |
| 821 | return 1; |
| 822 | } |
| 823 | skb_set_owner_r(skb, sk); |
| 824 | return 0; |
| 825 | } |
| 826 | |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 827 | static int __netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | int len = skb->len; |
| 830 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | skb_queue_tail(&sk->sk_receive_queue, skb); |
| 832 | sk->sk_data_ready(sk, len); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 833 | return len; |
| 834 | } |
| 835 | |
| 836 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
| 837 | { |
| 838 | int len = __netlink_sendskb(sk, skb); |
| 839 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | sock_put(sk); |
| 841 | return len; |
| 842 | } |
| 843 | |
| 844 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb) |
| 845 | { |
| 846 | kfree_skb(skb); |
| 847 | sock_put(sk); |
| 848 | } |
| 849 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 850 | static struct sk_buff *netlink_trim(struct sk_buff *skb, gfp_t allocation) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | { |
| 852 | int delta; |
| 853 | |
Patrick McHardy | 1298ca4 | 2013-04-17 06:46:59 +0000 | [diff] [blame^] | 854 | WARN_ON(skb->sk != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 856 | delta = skb->end - skb->tail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | if (delta * 2 < skb->truesize) |
| 858 | return skb; |
| 859 | |
| 860 | if (skb_shared(skb)) { |
| 861 | struct sk_buff *nskb = skb_clone(skb, allocation); |
| 862 | if (!nskb) |
| 863 | return skb; |
Eric Dumazet | 8460c00 | 2012-04-19 02:24:28 +0000 | [diff] [blame] | 864 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | skb = nskb; |
| 866 | } |
| 867 | |
| 868 | if (!pskb_expand_head(skb, 0, -delta, allocation)) |
| 869 | skb->truesize -= delta; |
| 870 | |
| 871 | return skb; |
| 872 | } |
| 873 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 874 | static void netlink_rcv_wake(struct sock *sk) |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 875 | { |
| 876 | struct netlink_sock *nlk = nlk_sk(sk); |
| 877 | |
| 878 | if (skb_queue_empty(&sk->sk_receive_queue)) |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 879 | clear_bit(NETLINK_CONGESTED, &nlk->state); |
| 880 | if (!test_bit(NETLINK_CONGESTED, &nlk->state)) |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 881 | wake_up_interruptible(&nlk->wait); |
| 882 | } |
| 883 | |
Eric W. Biederman | 3fbc290 | 2012-05-24 17:21:27 -0600 | [diff] [blame] | 884 | static int netlink_unicast_kernel(struct sock *sk, struct sk_buff *skb, |
| 885 | struct sock *ssk) |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 886 | { |
| 887 | int ret; |
| 888 | struct netlink_sock *nlk = nlk_sk(sk); |
| 889 | |
| 890 | ret = -ECONNREFUSED; |
| 891 | if (nlk->netlink_rcv != NULL) { |
| 892 | ret = skb->len; |
| 893 | skb_set_owner_r(skb, sk); |
Patrick McHardy | e32123e | 2013-04-17 06:46:57 +0000 | [diff] [blame] | 894 | NETLINK_CB(skb).sk = ssk; |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 895 | nlk->netlink_rcv(skb); |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 896 | consume_skb(skb); |
| 897 | } else { |
| 898 | kfree_skb(skb); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 899 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 900 | sock_put(sk); |
| 901 | return ret; |
| 902 | } |
| 903 | |
| 904 | int netlink_unicast(struct sock *ssk, struct sk_buff *skb, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 905 | u32 portid, int nonblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | { |
| 907 | struct sock *sk; |
| 908 | int err; |
| 909 | long timeo; |
| 910 | |
| 911 | skb = netlink_trim(skb, gfp_any()); |
| 912 | |
| 913 | timeo = sock_sndtimeo(ssk, nonblock); |
| 914 | retry: |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 915 | sk = netlink_getsockbyportid(ssk, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | if (IS_ERR(sk)) { |
| 917 | kfree_skb(skb); |
| 918 | return PTR_ERR(sk); |
| 919 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 920 | if (netlink_is_kernel(sk)) |
Eric W. Biederman | 3fbc290 | 2012-05-24 17:21:27 -0600 | [diff] [blame] | 921 | return netlink_unicast_kernel(sk, skb, ssk); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 922 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 923 | if (sk_filter(sk, skb)) { |
Wang Chen | 8487460 | 2008-07-01 19:55:09 -0700 | [diff] [blame] | 924 | err = skb->len; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 925 | kfree_skb(skb); |
| 926 | sock_put(sk); |
| 927 | return err; |
| 928 | } |
| 929 | |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 930 | err = netlink_attachskb(sk, skb, &timeo, ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | if (err == 1) |
| 932 | goto retry; |
| 933 | if (err) |
| 934 | return err; |
| 935 | |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 936 | return netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 938 | EXPORT_SYMBOL(netlink_unicast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 940 | int netlink_has_listeners(struct sock *sk, unsigned int group) |
| 941 | { |
| 942 | int res = 0; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 943 | struct listeners *listeners; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 944 | |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 945 | BUG_ON(!netlink_is_kernel(sk)); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 946 | |
| 947 | rcu_read_lock(); |
| 948 | listeners = rcu_dereference(nl_table[sk->sk_protocol].listeners); |
| 949 | |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 950 | if (listeners && group - 1 < nl_table[sk->sk_protocol].groups) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 951 | res = test_bit(group - 1, listeners->masks); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 952 | |
| 953 | rcu_read_unlock(); |
| 954 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 955 | return res; |
| 956 | } |
| 957 | EXPORT_SYMBOL_GPL(netlink_has_listeners); |
| 958 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 959 | static int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | { |
| 961 | struct netlink_sock *nlk = nlk_sk(sk); |
| 962 | |
| 963 | if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf && |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 964 | !test_bit(NETLINK_CONGESTED, &nlk->state)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 965 | skb_set_owner_r(skb, sk); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 966 | __netlink_sendskb(sk, skb); |
stephen hemminger | 2c645800 | 2011-12-22 08:52:03 +0000 | [diff] [blame] | 967 | return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | } |
| 969 | return -1; |
| 970 | } |
| 971 | |
| 972 | struct netlink_broadcast_data { |
| 973 | struct sock *exclude_sk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 974 | struct net *net; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 975 | u32 portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | u32 group; |
| 977 | int failure; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 978 | int delivery_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | int congested; |
| 980 | int delivered; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 981 | gfp_t allocation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | struct sk_buff *skb, *skb2; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 983 | int (*tx_filter)(struct sock *dsk, struct sk_buff *skb, void *data); |
| 984 | void *tx_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | }; |
| 986 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 987 | static int do_one_broadcast(struct sock *sk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | struct netlink_broadcast_data *p) |
| 989 | { |
| 990 | struct netlink_sock *nlk = nlk_sk(sk); |
| 991 | int val; |
| 992 | |
| 993 | if (p->exclude_sk == sk) |
| 994 | goto out; |
| 995 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 996 | if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups || |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 997 | !test_bit(p->group - 1, nlk->groups)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | goto out; |
| 999 | |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1000 | if (!net_eq(sock_net(sk), p->net)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1001 | goto out; |
| 1002 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | if (p->failure) { |
| 1004 | netlink_overrun(sk); |
| 1005 | goto out; |
| 1006 | } |
| 1007 | |
| 1008 | sock_hold(sk); |
| 1009 | if (p->skb2 == NULL) { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1010 | if (skb_shared(p->skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | p->skb2 = skb_clone(p->skb, p->allocation); |
| 1012 | } else { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1013 | p->skb2 = skb_get(p->skb); |
| 1014 | /* |
| 1015 | * skb ownership may have been set when |
| 1016 | * delivered to a previous socket. |
| 1017 | */ |
| 1018 | skb_orphan(p->skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | } |
| 1020 | } |
| 1021 | if (p->skb2 == NULL) { |
| 1022 | netlink_overrun(sk); |
| 1023 | /* Clone failed. Notify ALL listeners. */ |
| 1024 | p->failure = 1; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1025 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1026 | p->delivery_failure = 1; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1027 | } else if (p->tx_filter && p->tx_filter(sk, p->skb2, p->tx_data)) { |
| 1028 | kfree_skb(p->skb2); |
| 1029 | p->skb2 = NULL; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1030 | } else if (sk_filter(sk, p->skb2)) { |
| 1031 | kfree_skb(p->skb2); |
| 1032 | p->skb2 = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1033 | } else if ((val = netlink_broadcast_deliver(sk, p->skb2)) < 0) { |
| 1034 | netlink_overrun(sk); |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1035 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1036 | p->delivery_failure = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | } else { |
| 1038 | p->congested |= val; |
| 1039 | p->delivered = 1; |
| 1040 | p->skb2 = NULL; |
| 1041 | } |
| 1042 | sock_put(sk); |
| 1043 | |
| 1044 | out: |
| 1045 | return 0; |
| 1046 | } |
| 1047 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1048 | int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, u32 portid, |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1049 | u32 group, gfp_t allocation, |
| 1050 | int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), |
| 1051 | void *filter_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1053 | struct net *net = sock_net(ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | struct netlink_broadcast_data info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1055 | struct sock *sk; |
| 1056 | |
| 1057 | skb = netlink_trim(skb, allocation); |
| 1058 | |
| 1059 | info.exclude_sk = ssk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1060 | info.net = net; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1061 | info.portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | info.group = group; |
| 1063 | info.failure = 0; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1064 | info.delivery_failure = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | info.congested = 0; |
| 1066 | info.delivered = 0; |
| 1067 | info.allocation = allocation; |
| 1068 | info.skb = skb; |
| 1069 | info.skb2 = NULL; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1070 | info.tx_filter = filter; |
| 1071 | info.tx_data = filter_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | |
| 1073 | /* While we sleep in clone, do not allow to change socket list */ |
| 1074 | |
| 1075 | netlink_lock_table(); |
| 1076 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1077 | sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | do_one_broadcast(sk, &info); |
| 1079 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 1080 | consume_skb(skb); |
Tommy S. Christensen | aa1c6a6 | 2005-05-19 13:07:32 -0700 | [diff] [blame] | 1081 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | netlink_unlock_table(); |
| 1083 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 1084 | if (info.delivery_failure) { |
| 1085 | kfree_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1086 | return -ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1087 | } |
| 1088 | consume_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1089 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | if (info.delivered) { |
| 1091 | if (info.congested && (allocation & __GFP_WAIT)) |
| 1092 | yield(); |
| 1093 | return 0; |
| 1094 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | return -ESRCH; |
| 1096 | } |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1097 | EXPORT_SYMBOL(netlink_broadcast_filtered); |
| 1098 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1099 | int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 portid, |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1100 | u32 group, gfp_t allocation) |
| 1101 | { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1102 | return netlink_broadcast_filtered(ssk, skb, portid, group, allocation, |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1103 | NULL, NULL); |
| 1104 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1105 | EXPORT_SYMBOL(netlink_broadcast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | |
| 1107 | struct netlink_set_err_data { |
| 1108 | struct sock *exclude_sk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1109 | u32 portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1110 | u32 group; |
| 1111 | int code; |
| 1112 | }; |
| 1113 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1114 | static int do_one_set_err(struct sock *sk, struct netlink_set_err_data *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | { |
| 1116 | struct netlink_sock *nlk = nlk_sk(sk); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1117 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | |
| 1119 | if (sk == p->exclude_sk) |
| 1120 | goto out; |
| 1121 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1122 | if (!net_eq(sock_net(sk), sock_net(p->exclude_sk))) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1123 | goto out; |
| 1124 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1125 | if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups || |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1126 | !test_bit(p->group - 1, nlk->groups)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1127 | goto out; |
| 1128 | |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1129 | if (p->code == ENOBUFS && nlk->flags & NETLINK_RECV_NO_ENOBUFS) { |
| 1130 | ret = 1; |
| 1131 | goto out; |
| 1132 | } |
| 1133 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | sk->sk_err = p->code; |
| 1135 | sk->sk_error_report(sk); |
| 1136 | out: |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1137 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | } |
| 1139 | |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 1140 | /** |
| 1141 | * netlink_set_err - report error to broadcast listeners |
| 1142 | * @ssk: the kernel netlink socket, as returned by netlink_kernel_create() |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1143 | * @portid: the PORTID of a process that we want to skip (if any) |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 1144 | * @groups: the broadcast group that will notice the error |
| 1145 | * @code: error code, must be negative (as usual in kernelspace) |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1146 | * |
| 1147 | * This function returns the number of broadcast listeners that have set the |
| 1148 | * NETLINK_RECV_NO_ENOBUFS socket option. |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 1149 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1150 | int netlink_set_err(struct sock *ssk, u32 portid, u32 group, int code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | { |
| 1152 | struct netlink_set_err_data info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1153 | struct sock *sk; |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1154 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | |
| 1156 | info.exclude_sk = ssk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1157 | info.portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | info.group = group; |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 1159 | /* sk->sk_err wants a positive error value */ |
| 1160 | info.code = -code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | |
| 1162 | read_lock(&nl_table_lock); |
| 1163 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1164 | sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list) |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1165 | ret += do_one_set_err(sk, &info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | |
| 1167 | read_unlock(&nl_table_lock); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1168 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | } |
Pablo Neira Ayuso | dd5b6ce | 2009-03-23 13:21:06 +0100 | [diff] [blame] | 1170 | EXPORT_SYMBOL(netlink_set_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1171 | |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1172 | /* must be called with netlink table grabbed */ |
| 1173 | static void netlink_update_socket_mc(struct netlink_sock *nlk, |
| 1174 | unsigned int group, |
| 1175 | int is_new) |
| 1176 | { |
| 1177 | int old, new = !!is_new, subscriptions; |
| 1178 | |
| 1179 | old = test_bit(group - 1, nlk->groups); |
| 1180 | subscriptions = nlk->subscriptions - old + new; |
| 1181 | if (new) |
| 1182 | __set_bit(group - 1, nlk->groups); |
| 1183 | else |
| 1184 | __clear_bit(group - 1, nlk->groups); |
| 1185 | netlink_update_subscriptions(&nlk->sk, subscriptions); |
| 1186 | netlink_update_listeners(&nlk->sk); |
| 1187 | } |
| 1188 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1189 | static int netlink_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1190 | char __user *optval, unsigned int optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1191 | { |
| 1192 | struct sock *sk = sock->sk; |
| 1193 | struct netlink_sock *nlk = nlk_sk(sk); |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 1194 | unsigned int val = 0; |
| 1195 | int err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1196 | |
| 1197 | if (level != SOL_NETLINK) |
| 1198 | return -ENOPROTOOPT; |
| 1199 | |
| 1200 | if (optlen >= sizeof(int) && |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 1201 | get_user(val, (unsigned int __user *)optval)) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1202 | return -EFAULT; |
| 1203 | |
| 1204 | switch (optname) { |
| 1205 | case NETLINK_PKTINFO: |
| 1206 | if (val) |
| 1207 | nlk->flags |= NETLINK_RECV_PKTINFO; |
| 1208 | else |
| 1209 | nlk->flags &= ~NETLINK_RECV_PKTINFO; |
| 1210 | err = 0; |
| 1211 | break; |
| 1212 | case NETLINK_ADD_MEMBERSHIP: |
| 1213 | case NETLINK_DROP_MEMBERSHIP: { |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1214 | if (!netlink_capable(sock, NL_CFG_F_NONROOT_RECV)) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1215 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1216 | err = netlink_realloc_groups(sk); |
| 1217 | if (err) |
| 1218 | return err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1219 | if (!val || val - 1 >= nlk->ngroups) |
| 1220 | return -EINVAL; |
| 1221 | netlink_table_grab(); |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1222 | netlink_update_socket_mc(nlk, val, |
| 1223 | optname == NETLINK_ADD_MEMBERSHIP); |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1224 | netlink_table_ungrab(); |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 1225 | |
| 1226 | if (nlk->netlink_bind) |
| 1227 | nlk->netlink_bind(val); |
| 1228 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1229 | err = 0; |
| 1230 | break; |
| 1231 | } |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1232 | case NETLINK_BROADCAST_ERROR: |
| 1233 | if (val) |
| 1234 | nlk->flags |= NETLINK_BROADCAST_SEND_ERROR; |
| 1235 | else |
| 1236 | nlk->flags &= ~NETLINK_BROADCAST_SEND_ERROR; |
| 1237 | err = 0; |
| 1238 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1239 | case NETLINK_NO_ENOBUFS: |
| 1240 | if (val) { |
| 1241 | nlk->flags |= NETLINK_RECV_NO_ENOBUFS; |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1242 | clear_bit(NETLINK_CONGESTED, &nlk->state); |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1243 | wake_up_interruptible(&nlk->wait); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1244 | } else { |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1245 | nlk->flags &= ~NETLINK_RECV_NO_ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1246 | } |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1247 | err = 0; |
| 1248 | break; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1249 | default: |
| 1250 | err = -ENOPROTOOPT; |
| 1251 | } |
| 1252 | return err; |
| 1253 | } |
| 1254 | |
| 1255 | static int netlink_getsockopt(struct socket *sock, int level, int optname, |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1256 | char __user *optval, int __user *optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1257 | { |
| 1258 | struct sock *sk = sock->sk; |
| 1259 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1260 | int len, val, err; |
| 1261 | |
| 1262 | if (level != SOL_NETLINK) |
| 1263 | return -ENOPROTOOPT; |
| 1264 | |
| 1265 | if (get_user(len, optlen)) |
| 1266 | return -EFAULT; |
| 1267 | if (len < 0) |
| 1268 | return -EINVAL; |
| 1269 | |
| 1270 | switch (optname) { |
| 1271 | case NETLINK_PKTINFO: |
| 1272 | if (len < sizeof(int)) |
| 1273 | return -EINVAL; |
| 1274 | len = sizeof(int); |
| 1275 | val = nlk->flags & NETLINK_RECV_PKTINFO ? 1 : 0; |
Heiko Carstens | a27b58f | 2006-10-30 15:06:12 -0800 | [diff] [blame] | 1276 | if (put_user(len, optlen) || |
| 1277 | put_user(val, optval)) |
| 1278 | return -EFAULT; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1279 | err = 0; |
| 1280 | break; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1281 | case NETLINK_BROADCAST_ERROR: |
| 1282 | if (len < sizeof(int)) |
| 1283 | return -EINVAL; |
| 1284 | len = sizeof(int); |
| 1285 | val = nlk->flags & NETLINK_BROADCAST_SEND_ERROR ? 1 : 0; |
| 1286 | if (put_user(len, optlen) || |
| 1287 | put_user(val, optval)) |
| 1288 | return -EFAULT; |
| 1289 | err = 0; |
| 1290 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1291 | case NETLINK_NO_ENOBUFS: |
| 1292 | if (len < sizeof(int)) |
| 1293 | return -EINVAL; |
| 1294 | len = sizeof(int); |
| 1295 | val = nlk->flags & NETLINK_RECV_NO_ENOBUFS ? 1 : 0; |
| 1296 | if (put_user(len, optlen) || |
| 1297 | put_user(val, optval)) |
| 1298 | return -EFAULT; |
| 1299 | err = 0; |
| 1300 | break; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1301 | default: |
| 1302 | err = -ENOPROTOOPT; |
| 1303 | } |
| 1304 | return err; |
| 1305 | } |
| 1306 | |
| 1307 | static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
| 1308 | { |
| 1309 | struct nl_pktinfo info; |
| 1310 | |
| 1311 | info.group = NETLINK_CB(skb).dst_group; |
| 1312 | put_cmsg(msg, SOL_NETLINK, NETLINK_PKTINFO, sizeof(info), &info); |
| 1313 | } |
| 1314 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock, |
| 1316 | struct msghdr *msg, size_t len) |
| 1317 | { |
| 1318 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 1319 | struct sock *sk = sock->sk; |
| 1320 | struct netlink_sock *nlk = nlk_sk(sk); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1321 | struct sockaddr_nl *addr = msg->msg_name; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1322 | u32 dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1323 | u32 dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | struct sk_buff *skb; |
| 1325 | int err; |
| 1326 | struct scm_cookie scm; |
| 1327 | |
| 1328 | if (msg->msg_flags&MSG_OOB) |
| 1329 | return -EOPNOTSUPP; |
| 1330 | |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1331 | if (NULL == siocb->scm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | siocb->scm = &scm; |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1333 | |
Eric Dumazet | e0e3cea | 2012-08-21 06:21:17 +0000 | [diff] [blame] | 1334 | err = scm_send(sock, msg, siocb->scm, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | if (err < 0) |
| 1336 | return err; |
| 1337 | |
| 1338 | if (msg->msg_namelen) { |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1339 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | if (addr->nl_family != AF_NETLINK) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1341 | goto out; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1342 | dst_portid = addr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1343 | dst_group = ffs(addr->nl_groups); |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1344 | err = -EPERM; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1345 | if ((dst_group || dst_portid) && |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1346 | !netlink_capable(sock, NL_CFG_F_NONROOT_SEND)) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1347 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | } else { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1349 | dst_portid = nlk->dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1350 | dst_group = nlk->dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | } |
| 1352 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1353 | if (!nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | err = netlink_autobind(sock); |
| 1355 | if (err) |
| 1356 | goto out; |
| 1357 | } |
| 1358 | |
| 1359 | err = -EMSGSIZE; |
| 1360 | if (len > sk->sk_sndbuf - 32) |
| 1361 | goto out; |
| 1362 | err = -ENOBUFS; |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 1363 | skb = alloc_skb(len, GFP_KERNEL); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1364 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1365 | goto out; |
| 1366 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1367 | NETLINK_CB(skb).portid = nlk->portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1368 | NETLINK_CB(skb).dst_group = dst_group; |
Eric W. Biederman | dbe9a41 | 2012-09-06 18:20:01 +0000 | [diff] [blame] | 1369 | NETLINK_CB(skb).creds = siocb->scm->creds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | err = -EFAULT; |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1372 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | kfree_skb(skb); |
| 1374 | goto out; |
| 1375 | } |
| 1376 | |
| 1377 | err = security_netlink_send(sk, skb); |
| 1378 | if (err) { |
| 1379 | kfree_skb(skb); |
| 1380 | goto out; |
| 1381 | } |
| 1382 | |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1383 | if (dst_group) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1384 | atomic_inc(&skb->users); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1385 | netlink_broadcast(sk, skb, dst_portid, dst_group, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1386 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1387 | err = netlink_unicast(sk, skb, dst_portid, msg->msg_flags&MSG_DONTWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | |
| 1389 | out: |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1390 | scm_destroy(siocb->scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | return err; |
| 1392 | } |
| 1393 | |
| 1394 | static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock, |
| 1395 | struct msghdr *msg, size_t len, |
| 1396 | int flags) |
| 1397 | { |
| 1398 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 1399 | struct scm_cookie scm; |
| 1400 | struct sock *sk = sock->sk; |
| 1401 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1402 | int noblock = flags&MSG_DONTWAIT; |
| 1403 | size_t copied; |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1404 | struct sk_buff *skb, *data_skb; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1405 | int err, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | |
| 1407 | if (flags&MSG_OOB) |
| 1408 | return -EOPNOTSUPP; |
| 1409 | |
| 1410 | copied = 0; |
| 1411 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1412 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
| 1413 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1414 | goto out; |
| 1415 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1416 | data_skb = skb; |
| 1417 | |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1418 | #ifdef CONFIG_COMPAT_NETLINK_MESSAGES |
| 1419 | if (unlikely(skb_shinfo(skb)->frag_list)) { |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1420 | /* |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1421 | * If this skb has a frag_list, then here that means that we |
| 1422 | * will have to use the frag_list skb's data for compat tasks |
| 1423 | * and the regular skb's data for normal (non-compat) tasks. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1424 | * |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1425 | * If we need to send the compat skb, assign it to the |
| 1426 | * 'data_skb' variable so that it will be used below for data |
| 1427 | * copying. We keep 'skb' for everything else, including |
| 1428 | * freeing both later. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1429 | */ |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1430 | if (flags & MSG_CMSG_COMPAT) |
| 1431 | data_skb = skb_shinfo(skb)->frag_list; |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1432 | } |
| 1433 | #endif |
| 1434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | msg->msg_namelen = 0; |
| 1436 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1437 | copied = data_skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | if (len < copied) { |
| 1439 | msg->msg_flags |= MSG_TRUNC; |
| 1440 | copied = len; |
| 1441 | } |
| 1442 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1443 | skb_reset_transport_header(data_skb); |
| 1444 | err = skb_copy_datagram_iovec(data_skb, 0, msg->msg_iov, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | |
| 1446 | if (msg->msg_name) { |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1447 | struct sockaddr_nl *addr = (struct sockaddr_nl *)msg->msg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1448 | addr->nl_family = AF_NETLINK; |
| 1449 | addr->nl_pad = 0; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1450 | addr->nl_pid = NETLINK_CB(skb).portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1451 | addr->nl_groups = netlink_group_mask(NETLINK_CB(skb).dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | msg->msg_namelen = sizeof(*addr); |
| 1453 | } |
| 1454 | |
Patrick McHardy | cc9a06c | 2006-03-12 20:34:27 -0800 | [diff] [blame] | 1455 | if (nlk->flags & NETLINK_RECV_PKTINFO) |
| 1456 | netlink_cmsg_recv_pktinfo(msg, skb); |
| 1457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | if (NULL == siocb->scm) { |
| 1459 | memset(&scm, 0, sizeof(scm)); |
| 1460 | siocb->scm = &scm; |
| 1461 | } |
| 1462 | siocb->scm->creds = *NETLINK_CREDS(skb); |
Patrick McHardy | 188ccb5 | 2007-05-03 03:27:01 -0700 | [diff] [blame] | 1463 | if (flags & MSG_TRUNC) |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1464 | copied = data_skb->len; |
David S. Miller | daa3766 | 2010-08-15 23:21:50 -0700 | [diff] [blame] | 1465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | skb_free_datagram(sk, skb); |
| 1467 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1468 | if (nlk->cb && atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2) { |
| 1469 | ret = netlink_dump(sk); |
| 1470 | if (ret) { |
| 1471 | sk->sk_err = ret; |
| 1472 | sk->sk_error_report(sk); |
| 1473 | } |
| 1474 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | |
| 1476 | scm_recv(sock, msg, siocb->scm, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | out: |
| 1478 | netlink_rcv_wake(sk); |
| 1479 | return err ? : copied; |
| 1480 | } |
| 1481 | |
| 1482 | static void netlink_data_ready(struct sock *sk, int len) |
| 1483 | { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1484 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | } |
| 1486 | |
| 1487 | /* |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1488 | * We export these functions to other modules. They provide a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | * complete set of kernel non-blocking support for message |
| 1490 | * queueing. |
| 1491 | */ |
| 1492 | |
| 1493 | struct sock * |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 1494 | __netlink_kernel_create(struct net *net, int unit, struct module *module, |
| 1495 | struct netlink_kernel_cfg *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | { |
| 1497 | struct socket *sock; |
| 1498 | struct sock *sk; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1499 | struct netlink_sock *nlk; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1500 | struct listeners *listeners = NULL; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1501 | struct mutex *cb_mutex = cfg ? cfg->cb_mutex : NULL; |
| 1502 | unsigned int groups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1503 | |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 1504 | BUG_ON(!nl_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1506 | if (unit < 0 || unit >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | return NULL; |
| 1508 | |
| 1509 | if (sock_create_lite(PF_NETLINK, SOCK_DGRAM, unit, &sock)) |
| 1510 | return NULL; |
| 1511 | |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 1512 | /* |
| 1513 | * We have to just have a reference on the net from sk, but don't |
| 1514 | * get_net it. Besides, we cannot get and then put the net here. |
| 1515 | * So we create one inside init_net and the move it to net. |
| 1516 | */ |
| 1517 | |
| 1518 | if (__netlink_create(&init_net, sock, cb_mutex, unit) < 0) |
| 1519 | goto out_sock_release_nosk; |
| 1520 | |
| 1521 | sk = sock->sk; |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1522 | sk_change_net(sk, net); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1523 | |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1524 | if (!cfg || cfg->groups < 32) |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1525 | groups = 32; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1526 | else |
| 1527 | groups = cfg->groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1528 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1529 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1530 | if (!listeners) |
| 1531 | goto out_sock_release; |
| 1532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | sk->sk_data_ready = netlink_data_ready; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1534 | if (cfg && cfg->input) |
| 1535 | nlk_sk(sk)->netlink_rcv = cfg->input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1537 | if (netlink_insert(sk, net, 0)) |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1538 | goto out_sock_release; |
| 1539 | |
| 1540 | nlk = nlk_sk(sk); |
| 1541 | nlk->flags |= NETLINK_KERNEL_SOCKET; |
| 1542 | |
| 1543 | netlink_table_grab(); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1544 | if (!nl_table[unit].registered) { |
| 1545 | nl_table[unit].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1546 | rcu_assign_pointer(nl_table[unit].listeners, listeners); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1547 | nl_table[unit].cb_mutex = cb_mutex; |
| 1548 | nl_table[unit].module = module; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1549 | if (cfg) { |
| 1550 | nl_table[unit].bind = cfg->bind; |
| 1551 | nl_table[unit].flags = cfg->flags; |
| 1552 | } |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1553 | nl_table[unit].registered = 1; |
Jesper Juhl | f937f1f46 | 2007-10-15 01:39:12 -0700 | [diff] [blame] | 1554 | } else { |
| 1555 | kfree(listeners); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1556 | nl_table[unit].registered++; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1557 | } |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1558 | netlink_table_ungrab(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1559 | return sk; |
| 1560 | |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1561 | out_sock_release: |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1562 | kfree(listeners); |
Denis V. Lunev | 9dfbec1 | 2008-02-29 11:17:56 -0800 | [diff] [blame] | 1563 | netlink_kernel_release(sk); |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 1564 | return NULL; |
| 1565 | |
| 1566 | out_sock_release_nosk: |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1567 | sock_release(sock); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1568 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | } |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 1570 | EXPORT_SYMBOL(__netlink_kernel_create); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 1571 | |
| 1572 | void |
| 1573 | netlink_kernel_release(struct sock *sk) |
| 1574 | { |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1575 | sk_release_kernel(sk); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 1576 | } |
| 1577 | EXPORT_SYMBOL(netlink_kernel_release); |
| 1578 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1579 | int __netlink_change_ngroups(struct sock *sk, unsigned int groups) |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1580 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1581 | struct listeners *new, *old; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1582 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1583 | |
| 1584 | if (groups < 32) |
| 1585 | groups = 32; |
| 1586 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1587 | if (NLGRPSZ(tbl->groups) < NLGRPSZ(groups)) { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1588 | new = kzalloc(sizeof(*new) + NLGRPSZ(groups), GFP_ATOMIC); |
| 1589 | if (!new) |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1590 | return -ENOMEM; |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1591 | old = nl_deref_protected(tbl->listeners); |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1592 | memcpy(new->masks, old->masks, NLGRPSZ(tbl->groups)); |
| 1593 | rcu_assign_pointer(tbl->listeners, new); |
| 1594 | |
Lai Jiangshan | 37b6b93 | 2011-03-15 18:01:42 +0800 | [diff] [blame] | 1595 | kfree_rcu(old, rcu); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1596 | } |
| 1597 | tbl->groups = groups; |
| 1598 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1599 | return 0; |
| 1600 | } |
| 1601 | |
| 1602 | /** |
| 1603 | * netlink_change_ngroups - change number of multicast groups |
| 1604 | * |
| 1605 | * This changes the number of multicast groups that are available |
| 1606 | * on a certain netlink family. Note that it is not possible to |
| 1607 | * change the number of groups to below 32. Also note that it does |
| 1608 | * not implicitly call netlink_clear_multicast_users() when the |
| 1609 | * number of groups is reduced. |
| 1610 | * |
| 1611 | * @sk: The kernel netlink socket, as returned by netlink_kernel_create(). |
| 1612 | * @groups: The new number of groups. |
| 1613 | */ |
| 1614 | int netlink_change_ngroups(struct sock *sk, unsigned int groups) |
| 1615 | { |
| 1616 | int err; |
| 1617 | |
| 1618 | netlink_table_grab(); |
| 1619 | err = __netlink_change_ngroups(sk, groups); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1620 | netlink_table_ungrab(); |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1621 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1622 | return err; |
| 1623 | } |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1624 | |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 1625 | void __netlink_clear_multicast_users(struct sock *ksk, unsigned int group) |
| 1626 | { |
| 1627 | struct sock *sk; |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 1628 | struct netlink_table *tbl = &nl_table[ksk->sk_protocol]; |
| 1629 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1630 | sk_for_each_bound(sk, &tbl->mc_list) |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 1631 | netlink_update_socket_mc(nlk_sk(sk), group, 0); |
| 1632 | } |
| 1633 | |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1634 | /** |
| 1635 | * netlink_clear_multicast_users - kick off multicast listeners |
| 1636 | * |
| 1637 | * This function removes all listeners from the given group. |
| 1638 | * @ksk: The kernel netlink socket, as returned by |
| 1639 | * netlink_kernel_create(). |
| 1640 | * @group: The multicast group to clear. |
| 1641 | */ |
| 1642 | void netlink_clear_multicast_users(struct sock *ksk, unsigned int group) |
| 1643 | { |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1644 | netlink_table_grab(); |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 1645 | __netlink_clear_multicast_users(ksk, group); |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1646 | netlink_table_ungrab(); |
| 1647 | } |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1648 | |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 1649 | struct nlmsghdr * |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1650 | __nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags) |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 1651 | { |
| 1652 | struct nlmsghdr *nlh; |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 1653 | int size = nlmsg_msg_size(len); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 1654 | |
| 1655 | nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); |
| 1656 | nlh->nlmsg_type = type; |
| 1657 | nlh->nlmsg_len = size; |
| 1658 | nlh->nlmsg_flags = flags; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1659 | nlh->nlmsg_pid = portid; |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 1660 | nlh->nlmsg_seq = seq; |
| 1661 | if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0) |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 1662 | memset(nlmsg_data(nlh) + len, 0, NLMSG_ALIGN(size) - size); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 1663 | return nlh; |
| 1664 | } |
| 1665 | EXPORT_SYMBOL(__nlmsg_put); |
| 1666 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | /* |
| 1668 | * It looks a bit ugly. |
| 1669 | * It would be better to create kernel thread. |
| 1670 | */ |
| 1671 | |
| 1672 | static int netlink_dump(struct sock *sk) |
| 1673 | { |
| 1674 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1675 | struct netlink_callback *cb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1676 | struct sk_buff *skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1677 | struct nlmsghdr *nlh; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1678 | int len, err = -ENOBUFS; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1679 | int alloc_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1681 | mutex_lock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | |
| 1683 | cb = nlk->cb; |
| 1684 | if (cb == NULL) { |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1685 | err = -EINVAL; |
| 1686 | goto errout_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1687 | } |
| 1688 | |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1689 | alloc_size = max_t(int, cb->min_dump_alloc, NLMSG_GOODSIZE); |
| 1690 | |
| 1691 | skb = sock_rmalloc(sk, alloc_size, 0, GFP_KERNEL); |
| 1692 | if (!skb) |
Dan Carpenter | c63d6ea | 2011-06-15 03:11:42 +0000 | [diff] [blame] | 1693 | goto errout_skb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1694 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | len = cb->dump(skb, cb); |
| 1696 | |
| 1697 | if (len > 0) { |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1698 | mutex_unlock(nlk->cb_mutex); |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1699 | |
| 1700 | if (sk_filter(sk, skb)) |
| 1701 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1702 | else |
| 1703 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | return 0; |
| 1705 | } |
| 1706 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1707 | nlh = nlmsg_put_answer(skb, cb, NLMSG_DONE, sizeof(len), NLM_F_MULTI); |
| 1708 | if (!nlh) |
| 1709 | goto errout_skb; |
| 1710 | |
Johannes Berg | 670dc28 | 2011-06-20 13:40:46 +0200 | [diff] [blame] | 1711 | nl_dump_check_consistent(cb, nlh); |
| 1712 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1713 | memcpy(nlmsg_data(nlh), &len, sizeof(len)); |
| 1714 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1715 | if (sk_filter(sk, skb)) |
| 1716 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1717 | else |
| 1718 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | |
Thomas Graf | a8f74b2 | 2005-11-10 02:25:52 +0100 | [diff] [blame] | 1720 | if (cb->done) |
| 1721 | cb->done(cb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | nlk->cb = NULL; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1723 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1724 | |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 1725 | module_put(cb->module); |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 1726 | netlink_consume_callback(cb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1727 | return 0; |
Thomas Graf | 1797754 | 2005-06-18 22:53:48 -0700 | [diff] [blame] | 1728 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1729 | errout_skb: |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1730 | mutex_unlock(nlk->cb_mutex); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1731 | kfree_skb(skb); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1732 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | } |
| 1734 | |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 1735 | int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
| 1736 | const struct nlmsghdr *nlh, |
| 1737 | struct netlink_dump_control *control) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1738 | { |
| 1739 | struct netlink_callback *cb; |
| 1740 | struct sock *sk; |
| 1741 | struct netlink_sock *nlk; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1742 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1743 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 1744 | cb = kzalloc(sizeof(*cb), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1745 | if (cb == NULL) |
| 1746 | return -ENOBUFS; |
| 1747 | |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 1748 | cb->dump = control->dump; |
| 1749 | cb->done = control->done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | cb->nlh = nlh; |
Pablo Neira Ayuso | 7175c88 | 2012-02-24 14:30:16 +0000 | [diff] [blame] | 1751 | cb->data = control->data; |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 1752 | cb->module = control->module; |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 1753 | cb->min_dump_alloc = control->min_dump_alloc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | atomic_inc(&skb->users); |
| 1755 | cb->skb = skb; |
| 1756 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1757 | sk = netlink_lookup(sock_net(ssk), ssk->sk_protocol, NETLINK_CB(skb).portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | if (sk == NULL) { |
| 1759 | netlink_destroy_callback(cb); |
| 1760 | return -ECONNREFUSED; |
| 1761 | } |
| 1762 | nlk = nlk_sk(sk); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 1763 | |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1764 | mutex_lock(nlk->cb_mutex); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 1765 | /* A dump is in progress... */ |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 1766 | if (nlk->cb) { |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1767 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | netlink_destroy_callback(cb); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 1769 | ret = -EBUSY; |
| 1770 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1771 | } |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 1772 | /* add reference of module which cb->dump belongs to */ |
| 1773 | if (!try_module_get(cb->module)) { |
| 1774 | mutex_unlock(nlk->cb_mutex); |
| 1775 | netlink_destroy_callback(cb); |
| 1776 | ret = -EPROTONOSUPPORT; |
| 1777 | goto out; |
| 1778 | } |
| 1779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | nlk->cb = cb; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1781 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1783 | ret = netlink_dump(sk); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 1784 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | sock_put(sk); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1786 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1787 | if (ret) |
| 1788 | return ret; |
| 1789 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1790 | /* We successfully started a dump, by returning -EINTR we |
| 1791 | * signal not to send ACK even if it was requested. |
| 1792 | */ |
| 1793 | return -EINTR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | } |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 1795 | EXPORT_SYMBOL(__netlink_dump_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1796 | |
| 1797 | void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err) |
| 1798 | { |
| 1799 | struct sk_buff *skb; |
| 1800 | struct nlmsghdr *rep; |
| 1801 | struct nlmsgerr *errmsg; |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 1802 | size_t payload = sizeof(*errmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 1804 | /* error messages get the original request appened */ |
| 1805 | if (err) |
| 1806 | payload += nlmsg_len(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 1808 | skb = nlmsg_new(payload, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | if (!skb) { |
| 1810 | struct sock *sk; |
| 1811 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1812 | sk = netlink_lookup(sock_net(in_skb->sk), |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1813 | in_skb->sk->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1814 | NETLINK_CB(in_skb).portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1815 | if (sk) { |
| 1816 | sk->sk_err = ENOBUFS; |
| 1817 | sk->sk_error_report(sk); |
| 1818 | sock_put(sk); |
| 1819 | } |
| 1820 | return; |
| 1821 | } |
| 1822 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1823 | rep = __nlmsg_put(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
John Fastabend | 5dba93a | 2009-09-25 13:11:44 +0000 | [diff] [blame] | 1824 | NLMSG_ERROR, payload, 0); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1825 | errmsg = nlmsg_data(rep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | errmsg->error = err; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1827 | memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(*nlh)); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1828 | netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).portid, MSG_DONTWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1830 | EXPORT_SYMBOL(netlink_ack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1832 | int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *, |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 1833 | struct nlmsghdr *)) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1834 | { |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1835 | struct nlmsghdr *nlh; |
| 1836 | int err; |
| 1837 | |
| 1838 | while (skb->len >= nlmsg_total_size(0)) { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1839 | int msglen; |
| 1840 | |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 1841 | nlh = nlmsg_hdr(skb); |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 1842 | err = 0; |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1843 | |
Martin Murray | ad8e4b7 | 2006-01-10 13:02:29 -0800 | [diff] [blame] | 1844 | if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1845 | return 0; |
| 1846 | |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 1847 | /* Only requests are handled by the kernel */ |
| 1848 | if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1849 | goto ack; |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 1850 | |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 1851 | /* Skip control messages */ |
| 1852 | if (nlh->nlmsg_type < NLMSG_MIN_TYPE) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1853 | goto ack; |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 1854 | |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 1855 | err = cb(skb, nlh); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1856 | if (err == -EINTR) |
| 1857 | goto skip; |
| 1858 | |
| 1859 | ack: |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 1860 | if (nlh->nlmsg_flags & NLM_F_ACK || err) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1861 | netlink_ack(skb, nlh, err); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1862 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1863 | skip: |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1864 | msglen = NLMSG_ALIGN(nlh->nlmsg_len); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1865 | if (msglen > skb->len) |
| 1866 | msglen = skb->len; |
| 1867 | skb_pull(skb, msglen); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1868 | } |
| 1869 | |
| 1870 | return 0; |
| 1871 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1872 | EXPORT_SYMBOL(netlink_rcv_skb); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1873 | |
| 1874 | /** |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1875 | * nlmsg_notify - send a notification netlink message |
| 1876 | * @sk: netlink socket to use |
| 1877 | * @skb: notification message |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1878 | * @portid: destination netlink portid for reports or 0 |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1879 | * @group: destination multicast group or 0 |
| 1880 | * @report: 1 to report back, 0 to disable |
| 1881 | * @flags: allocation flags |
| 1882 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1883 | int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1884 | unsigned int group, int report, gfp_t flags) |
| 1885 | { |
| 1886 | int err = 0; |
| 1887 | |
| 1888 | if (group) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1889 | int exclude_portid = 0; |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1890 | |
| 1891 | if (report) { |
| 1892 | atomic_inc(&skb->users); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1893 | exclude_portid = portid; |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1894 | } |
| 1895 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 1896 | /* errors reported via destination sk->sk_err, but propagate |
| 1897 | * delivery errors if NETLINK_BROADCAST_ERROR flag is set */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1898 | err = nlmsg_multicast(sk, skb, exclude_portid, group, flags); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1899 | } |
| 1900 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 1901 | if (report) { |
| 1902 | int err2; |
| 1903 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1904 | err2 = nlmsg_unicast(sk, skb, portid); |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 1905 | if (!err || err == -ESRCH) |
| 1906 | err = err2; |
| 1907 | } |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1908 | |
| 1909 | return err; |
| 1910 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1911 | EXPORT_SYMBOL(nlmsg_notify); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1912 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | #ifdef CONFIG_PROC_FS |
| 1914 | struct nl_seq_iter { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 1915 | struct seq_net_private p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | int link; |
| 1917 | int hash_idx; |
| 1918 | }; |
| 1919 | |
| 1920 | static struct sock *netlink_seq_socket_idx(struct seq_file *seq, loff_t pos) |
| 1921 | { |
| 1922 | struct nl_seq_iter *iter = seq->private; |
| 1923 | int i, j; |
| 1924 | struct sock *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | loff_t off = 0; |
| 1926 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1927 | for (i = 0; i < MAX_LINKS; i++) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1928 | struct nl_portid_hash *hash = &nl_table[i].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1929 | |
| 1930 | for (j = 0; j <= hash->mask; j++) { |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1931 | sk_for_each(s, &hash->table[j]) { |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 1932 | if (sock_net(s) != seq_file_net(seq)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1933 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | if (off == pos) { |
| 1935 | iter->link = i; |
| 1936 | iter->hash_idx = j; |
| 1937 | return s; |
| 1938 | } |
| 1939 | ++off; |
| 1940 | } |
| 1941 | } |
| 1942 | } |
| 1943 | return NULL; |
| 1944 | } |
| 1945 | |
| 1946 | static void *netlink_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 1947 | __acquires(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1948 | { |
| 1949 | read_lock(&nl_table_lock); |
| 1950 | return *pos ? netlink_seq_socket_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 1951 | } |
| 1952 | |
| 1953 | static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1954 | { |
| 1955 | struct sock *s; |
| 1956 | struct nl_seq_iter *iter; |
| 1957 | int i, j; |
| 1958 | |
| 1959 | ++*pos; |
| 1960 | |
| 1961 | if (v == SEQ_START_TOKEN) |
| 1962 | return netlink_seq_socket_idx(seq, 0); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1963 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1964 | iter = seq->private; |
| 1965 | s = v; |
| 1966 | do { |
| 1967 | s = sk_next(s); |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 1968 | } while (s && sock_net(s) != seq_file_net(seq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | if (s) |
| 1970 | return s; |
| 1971 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | i = iter->link; |
| 1973 | j = iter->hash_idx + 1; |
| 1974 | |
| 1975 | do { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1976 | struct nl_portid_hash *hash = &nl_table[i].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | |
| 1978 | for (; j <= hash->mask; j++) { |
| 1979 | s = sk_head(&hash->table[j]); |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 1980 | while (s && sock_net(s) != seq_file_net(seq)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1981 | s = sk_next(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | if (s) { |
| 1983 | iter->link = i; |
| 1984 | iter->hash_idx = j; |
| 1985 | return s; |
| 1986 | } |
| 1987 | } |
| 1988 | |
| 1989 | j = 0; |
| 1990 | } while (++i < MAX_LINKS); |
| 1991 | |
| 1992 | return NULL; |
| 1993 | } |
| 1994 | |
| 1995 | static void netlink_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 1996 | __releases(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | { |
| 1998 | read_unlock(&nl_table_lock); |
| 1999 | } |
| 2000 | |
| 2001 | |
| 2002 | static int netlink_seq_show(struct seq_file *seq, void *v) |
| 2003 | { |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2004 | if (v == SEQ_START_TOKEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | seq_puts(seq, |
| 2006 | "sk Eth Pid Groups " |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 2007 | "Rmem Wmem Dump Locks Drops Inode\n"); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2008 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | struct sock *s = v; |
| 2010 | struct netlink_sock *nlk = nlk_sk(s); |
| 2011 | |
Hannes Frederic Sowa | 9f1e0ad | 2012-12-15 15:09:19 +0000 | [diff] [blame] | 2012 | seq_printf(seq, "%pK %-3d %-6u %08x %-8d %-8d %pK %-8d %-8d %-8lu\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2013 | s, |
| 2014 | s->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2015 | nlk->portid, |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 2016 | nlk->groups ? (u32)nlk->groups[0] : 0, |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 2017 | sk_rmem_alloc_get(s), |
| 2018 | sk_wmem_alloc_get(s), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | nlk->cb, |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2020 | atomic_read(&s->sk_refcnt), |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 2021 | atomic_read(&s->sk_drops), |
| 2022 | sock_i_ino(s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | ); |
| 2024 | |
| 2025 | } |
| 2026 | return 0; |
| 2027 | } |
| 2028 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 2029 | static const struct seq_operations netlink_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | .start = netlink_seq_start, |
| 2031 | .next = netlink_seq_next, |
| 2032 | .stop = netlink_seq_stop, |
| 2033 | .show = netlink_seq_show, |
| 2034 | }; |
| 2035 | |
| 2036 | |
| 2037 | static int netlink_seq_open(struct inode *inode, struct file *file) |
| 2038 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2039 | return seq_open_net(inode, file, &netlink_seq_ops, |
| 2040 | sizeof(struct nl_seq_iter)); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2041 | } |
| 2042 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 2043 | static const struct file_operations netlink_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2044 | .owner = THIS_MODULE, |
| 2045 | .open = netlink_seq_open, |
| 2046 | .read = seq_read, |
| 2047 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2048 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | }; |
| 2050 | |
| 2051 | #endif |
| 2052 | |
| 2053 | int netlink_register_notifier(struct notifier_block *nb) |
| 2054 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2055 | return atomic_notifier_chain_register(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2056 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2057 | EXPORT_SYMBOL(netlink_register_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | |
| 2059 | int netlink_unregister_notifier(struct notifier_block *nb) |
| 2060 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2061 | return atomic_notifier_chain_unregister(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2062 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2063 | EXPORT_SYMBOL(netlink_unregister_notifier); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2064 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 2065 | static const struct proto_ops netlink_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | .family = PF_NETLINK, |
| 2067 | .owner = THIS_MODULE, |
| 2068 | .release = netlink_release, |
| 2069 | .bind = netlink_bind, |
| 2070 | .connect = netlink_connect, |
| 2071 | .socketpair = sock_no_socketpair, |
| 2072 | .accept = sock_no_accept, |
| 2073 | .getname = netlink_getname, |
| 2074 | .poll = datagram_poll, |
| 2075 | .ioctl = sock_no_ioctl, |
| 2076 | .listen = sock_no_listen, |
| 2077 | .shutdown = sock_no_shutdown, |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2078 | .setsockopt = netlink_setsockopt, |
| 2079 | .getsockopt = netlink_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2080 | .sendmsg = netlink_sendmsg, |
| 2081 | .recvmsg = netlink_recvmsg, |
| 2082 | .mmap = sock_no_mmap, |
| 2083 | .sendpage = sock_no_sendpage, |
| 2084 | }; |
| 2085 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 2086 | static const struct net_proto_family netlink_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | .family = PF_NETLINK, |
| 2088 | .create = netlink_create, |
| 2089 | .owner = THIS_MODULE, /* for consistency 8) */ |
| 2090 | }; |
| 2091 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 2092 | static int __net_init netlink_net_init(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2093 | { |
| 2094 | #ifdef CONFIG_PROC_FS |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 2095 | if (!proc_create("netlink", 0, net->proc_net, &netlink_seq_fops)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2096 | return -ENOMEM; |
| 2097 | #endif |
| 2098 | return 0; |
| 2099 | } |
| 2100 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 2101 | static void __net_exit netlink_net_exit(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2102 | { |
| 2103 | #ifdef CONFIG_PROC_FS |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 2104 | remove_proc_entry("netlink", net->proc_net); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2105 | #endif |
| 2106 | } |
| 2107 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2108 | static void __init netlink_add_usersock_entry(void) |
| 2109 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2110 | struct listeners *listeners; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2111 | int groups = 32; |
| 2112 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2113 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2114 | if (!listeners) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2115 | panic("netlink_add_usersock_entry: Cannot allocate listeners\n"); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2116 | |
| 2117 | netlink_table_grab(); |
| 2118 | |
| 2119 | nl_table[NETLINK_USERSOCK].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2120 | rcu_assign_pointer(nl_table[NETLINK_USERSOCK].listeners, listeners); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2121 | nl_table[NETLINK_USERSOCK].module = THIS_MODULE; |
| 2122 | nl_table[NETLINK_USERSOCK].registered = 1; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 2123 | nl_table[NETLINK_USERSOCK].flags = NL_CFG_F_NONROOT_SEND; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2124 | |
| 2125 | netlink_table_ungrab(); |
| 2126 | } |
| 2127 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 2128 | static struct pernet_operations __net_initdata netlink_net_ops = { |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2129 | .init = netlink_net_init, |
| 2130 | .exit = netlink_net_exit, |
| 2131 | }; |
| 2132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2133 | static int __init netlink_proto_init(void) |
| 2134 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2135 | int i; |
Denis Cheng | 26ff5dd | 2007-09-16 16:36:02 -0700 | [diff] [blame] | 2136 | unsigned long limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2137 | unsigned int order; |
| 2138 | int err = proto_register(&netlink_proto, 0); |
| 2139 | |
| 2140 | if (err != 0) |
| 2141 | goto out; |
| 2142 | |
YOSHIFUJI Hideaki / 吉藤英明 | fab2574 | 2013-01-09 07:19:48 +0000 | [diff] [blame] | 2143 | BUILD_BUG_ON(sizeof(struct netlink_skb_parms) > FIELD_SIZEOF(struct sk_buff, cb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2144 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 2145 | nl_table = kcalloc(MAX_LINKS, sizeof(*nl_table), GFP_KERNEL); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2146 | if (!nl_table) |
| 2147 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2148 | |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 2149 | if (totalram_pages >= (128 * 1024)) |
| 2150 | limit = totalram_pages >> (21 - PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2151 | else |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 2152 | limit = totalram_pages >> (23 - PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2153 | |
Denis Cheng | 26ff5dd | 2007-09-16 16:36:02 -0700 | [diff] [blame] | 2154 | order = get_bitmask_order(limit) - 1 + PAGE_SHIFT; |
| 2155 | limit = (1UL << order) / sizeof(struct hlist_head); |
| 2156 | order = get_bitmask_order(min(limit, (unsigned long)UINT_MAX)) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2157 | |
| 2158 | for (i = 0; i < MAX_LINKS; i++) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2159 | struct nl_portid_hash *hash = &nl_table[i].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2161 | hash->table = nl_portid_hash_zalloc(1 * sizeof(*hash->table)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | if (!hash->table) { |
| 2163 | while (i-- > 0) |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2164 | nl_portid_hash_free(nl_table[i].hash.table, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2165 | 1 * sizeof(*hash->table)); |
| 2166 | kfree(nl_table); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2167 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2168 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2169 | hash->max_shift = order; |
| 2170 | hash->shift = 0; |
| 2171 | hash->mask = 0; |
| 2172 | hash->rehash_time = jiffies; |
| 2173 | } |
| 2174 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2175 | netlink_add_usersock_entry(); |
| 2176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | sock_register(&netlink_family_ops); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2178 | register_pernet_subsys(&netlink_net_ops); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2179 | /* The netlink device handler may be needed early. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2180 | rtnetlink_init(); |
| 2181 | out: |
| 2182 | return err; |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2183 | panic: |
| 2184 | panic("netlink_init: Cannot allocate nl_table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | } |
| 2186 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2187 | core_initcall(netlink_proto_init); |