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 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 64 | #define NLGRPSZ(x) (ALIGN(x, sizeof(unsigned long) * 8) / 8) |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 65 | #define NLGRPLONGS(x) (NLGRPSZ(x)/sizeof(unsigned long)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
| 67 | struct netlink_sock { |
| 68 | /* struct sock has to be the first member of netlink_sock */ |
| 69 | struct sock sk; |
| 70 | u32 pid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | u32 dst_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 72 | u32 dst_group; |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 73 | u32 flags; |
| 74 | u32 subscriptions; |
| 75 | u32 ngroups; |
| 76 | unsigned long *groups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | unsigned long state; |
| 78 | wait_queue_head_t wait; |
| 79 | struct netlink_callback *cb; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 80 | struct mutex *cb_mutex; |
| 81 | struct mutex cb_def_mutex; |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 82 | void (*netlink_rcv)(struct sk_buff *skb); |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 83 | void (*netlink_bind)(int group); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 84 | struct module *module; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | }; |
| 86 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 87 | struct listeners { |
| 88 | struct rcu_head rcu; |
| 89 | unsigned long masks[0]; |
Johannes Berg | 6c04bb1 | 2009-07-10 09:51:32 +0000 | [diff] [blame] | 90 | }; |
| 91 | |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 92 | #define NETLINK_KERNEL_SOCKET 0x1 |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 93 | #define NETLINK_RECV_PKTINFO 0x2 |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 94 | #define NETLINK_BROADCAST_SEND_ERROR 0x4 |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 95 | #define NETLINK_RECV_NO_ENOBUFS 0x8 |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 96 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | static inline struct netlink_sock *nlk_sk(struct sock *sk) |
| 98 | { |
Denis Cheng | 32b21e0 | 2007-08-28 15:41:11 -0700 | [diff] [blame] | 99 | return container_of(sk, struct netlink_sock, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | } |
| 101 | |
David S. Miller | 035c4c1 | 2011-12-23 17:33:03 -0500 | [diff] [blame] | 102 | static inline int netlink_is_kernel(struct sock *sk) |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 103 | { |
| 104 | return nlk_sk(sk)->flags & NETLINK_KERNEL_SOCKET; |
| 105 | } |
| 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | struct nl_pid_hash { |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 108 | struct hlist_head *table; |
| 109 | unsigned long rehash_time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 111 | unsigned int mask; |
| 112 | unsigned int shift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 114 | unsigned int entries; |
| 115 | unsigned int max_shift; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 117 | u32 rnd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | }; |
| 119 | |
| 120 | struct netlink_table { |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 121 | struct nl_pid_hash hash; |
| 122 | struct hlist_head mc_list; |
| 123 | struct listeners __rcu *listeners; |
| 124 | unsigned int nl_nonroot; |
| 125 | unsigned int groups; |
| 126 | struct mutex *cb_mutex; |
| 127 | struct module *module; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 128 | void (*bind)(int group); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 129 | int registered; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | }; |
| 131 | |
| 132 | static struct netlink_table *nl_table; |
| 133 | |
| 134 | static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait); |
| 135 | |
| 136 | static int netlink_dump(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
| 138 | static DEFINE_RWLOCK(nl_table_lock); |
| 139 | static atomic_t nl_table_users = ATOMIC_INIT(0); |
| 140 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 141 | static ATOMIC_NOTIFIER_HEAD(netlink_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 143 | static inline u32 netlink_group_mask(u32 group) |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 144 | { |
| 145 | return group ? 1 << (group - 1) : 0; |
| 146 | } |
| 147 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 148 | static inline struct hlist_head *nl_pid_hashfn(struct nl_pid_hash *hash, u32 pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | { |
| 150 | return &hash->table[jhash_1word(pid, hash->rnd) & hash->mask]; |
| 151 | } |
| 152 | |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 153 | static void netlink_destroy_callback(struct netlink_callback *cb) |
| 154 | { |
| 155 | kfree_skb(cb->skb); |
| 156 | kfree(cb); |
| 157 | } |
| 158 | |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 159 | static void netlink_consume_callback(struct netlink_callback *cb) |
| 160 | { |
| 161 | consume_skb(cb->skb); |
| 162 | kfree(cb); |
| 163 | } |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | static void netlink_sock_destruct(struct sock *sk) |
| 166 | { |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 167 | struct netlink_sock *nlk = nlk_sk(sk); |
| 168 | |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 169 | if (nlk->cb) { |
| 170 | if (nlk->cb->done) |
| 171 | nlk->cb->done(nlk->cb); |
| 172 | netlink_destroy_callback(nlk->cb); |
| 173 | } |
| 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | skb_queue_purge(&sk->sk_receive_queue); |
| 176 | |
| 177 | if (!sock_flag(sk, SOCK_DEAD)) { |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 178 | printk(KERN_ERR "Freeing alive netlink socket %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | return; |
| 180 | } |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 181 | |
| 182 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| 183 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
| 184 | WARN_ON(nlk_sk(sk)->groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
| 186 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 187 | /* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on |
| 188 | * 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] | 189 | * immediately hit write lock and grab all the cpus. Exclusive sleep solves |
| 190 | * this, _but_ remember, it adds useless work on UP machines. |
| 191 | */ |
| 192 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 193 | void netlink_table_grab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 194 | __acquires(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | { |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 196 | might_sleep(); |
| 197 | |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 198 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | |
| 200 | if (atomic_read(&nl_table_users)) { |
| 201 | DECLARE_WAITQUEUE(wait, current); |
| 202 | |
| 203 | add_wait_queue_exclusive(&nl_table_wait, &wait); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 204 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 206 | if (atomic_read(&nl_table_users) == 0) |
| 207 | break; |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 208 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | schedule(); |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 210 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | __set_current_state(TASK_RUNNING); |
| 214 | remove_wait_queue(&nl_table_wait, &wait); |
| 215 | } |
| 216 | } |
| 217 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 218 | void netlink_table_ungrab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 219 | __releases(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | { |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 221 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | wake_up(&nl_table_wait); |
| 223 | } |
| 224 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 225 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | netlink_lock_table(void) |
| 227 | { |
| 228 | /* read_lock() synchronizes us to netlink_table_grab */ |
| 229 | |
| 230 | read_lock(&nl_table_lock); |
| 231 | atomic_inc(&nl_table_users); |
| 232 | read_unlock(&nl_table_lock); |
| 233 | } |
| 234 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 235 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | netlink_unlock_table(void) |
| 237 | { |
| 238 | if (atomic_dec_and_test(&nl_table_users)) |
| 239 | wake_up(&nl_table_wait); |
| 240 | } |
| 241 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 242 | static struct sock *netlink_lookup(struct net *net, int protocol, u32 pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | { |
| 244 | struct nl_pid_hash *hash = &nl_table[protocol].hash; |
| 245 | struct hlist_head *head; |
| 246 | struct sock *sk; |
| 247 | struct hlist_node *node; |
| 248 | |
| 249 | read_lock(&nl_table_lock); |
| 250 | head = nl_pid_hashfn(hash, pid); |
| 251 | sk_for_each(sk, node, head) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 252 | if (net_eq(sock_net(sk), net) && (nlk_sk(sk)->pid == pid)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 253 | sock_hold(sk); |
| 254 | goto found; |
| 255 | } |
| 256 | } |
| 257 | sk = NULL; |
| 258 | found: |
| 259 | read_unlock(&nl_table_lock); |
| 260 | return sk; |
| 261 | } |
| 262 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 263 | static struct hlist_head *nl_pid_hash_zalloc(size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | { |
| 265 | if (size <= PAGE_SIZE) |
Eric Dumazet | ea72912 | 2007-12-11 02:09:47 -0800 | [diff] [blame] | 266 | return kzalloc(size, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | else |
| 268 | return (struct hlist_head *) |
Eric Dumazet | ea72912 | 2007-12-11 02:09:47 -0800 | [diff] [blame] | 269 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
| 270 | get_order(size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } |
| 272 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 273 | static void nl_pid_hash_free(struct hlist_head *table, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | { |
| 275 | if (size <= PAGE_SIZE) |
| 276 | kfree(table); |
| 277 | else |
| 278 | free_pages((unsigned long)table, get_order(size)); |
| 279 | } |
| 280 | |
| 281 | static int nl_pid_hash_rehash(struct nl_pid_hash *hash, int grow) |
| 282 | { |
| 283 | unsigned int omask, mask, shift; |
| 284 | size_t osize, size; |
| 285 | struct hlist_head *otable, *table; |
| 286 | int i; |
| 287 | |
| 288 | omask = mask = hash->mask; |
| 289 | osize = size = (mask + 1) * sizeof(*table); |
| 290 | shift = hash->shift; |
| 291 | |
| 292 | if (grow) { |
| 293 | if (++shift > hash->max_shift) |
| 294 | return 0; |
| 295 | mask = mask * 2 + 1; |
| 296 | size *= 2; |
| 297 | } |
| 298 | |
Eric Dumazet | ea72912 | 2007-12-11 02:09:47 -0800 | [diff] [blame] | 299 | table = nl_pid_hash_zalloc(size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | if (!table) |
| 301 | return 0; |
| 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | otable = hash->table; |
| 304 | hash->table = table; |
| 305 | hash->mask = mask; |
| 306 | hash->shift = shift; |
| 307 | get_random_bytes(&hash->rnd, sizeof(hash->rnd)); |
| 308 | |
| 309 | for (i = 0; i <= omask; i++) { |
| 310 | struct sock *sk; |
| 311 | struct hlist_node *node, *tmp; |
| 312 | |
| 313 | sk_for_each_safe(sk, node, tmp, &otable[i]) |
| 314 | __sk_add_node(sk, nl_pid_hashfn(hash, nlk_sk(sk)->pid)); |
| 315 | } |
| 316 | |
| 317 | nl_pid_hash_free(otable, osize); |
| 318 | hash->rehash_time = jiffies + 10 * 60 * HZ; |
| 319 | return 1; |
| 320 | } |
| 321 | |
| 322 | static inline int nl_pid_hash_dilute(struct nl_pid_hash *hash, int len) |
| 323 | { |
| 324 | int avg = hash->entries >> hash->shift; |
| 325 | |
| 326 | if (unlikely(avg > 1) && nl_pid_hash_rehash(hash, 1)) |
| 327 | return 1; |
| 328 | |
| 329 | if (unlikely(len > avg) && time_after(jiffies, hash->rehash_time)) { |
| 330 | nl_pid_hash_rehash(hash, 0); |
| 331 | return 1; |
| 332 | } |
| 333 | |
| 334 | return 0; |
| 335 | } |
| 336 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 337 | static const struct proto_ops netlink_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 339 | static void |
| 340 | netlink_update_listeners(struct sock *sk) |
| 341 | { |
| 342 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
| 343 | struct hlist_node *node; |
| 344 | unsigned long mask; |
| 345 | unsigned int i; |
| 346 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 347 | for (i = 0; i < NLGRPLONGS(tbl->groups); i++) { |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 348 | mask = 0; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 349 | sk_for_each_bound(sk, node, &tbl->mc_list) { |
| 350 | if (i < NLGRPLONGS(nlk_sk(sk)->ngroups)) |
| 351 | mask |= nlk_sk(sk)->groups[i]; |
| 352 | } |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 353 | tbl->listeners->masks[i] = mask; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 354 | } |
| 355 | /* this function is only called with the netlink table "grabbed", which |
| 356 | * makes sure updates are visible before bind or setsockopt return. */ |
| 357 | } |
| 358 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 359 | static int netlink_insert(struct sock *sk, struct net *net, u32 pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | { |
| 361 | struct nl_pid_hash *hash = &nl_table[sk->sk_protocol].hash; |
| 362 | struct hlist_head *head; |
| 363 | int err = -EADDRINUSE; |
| 364 | struct sock *osk; |
| 365 | struct hlist_node *node; |
| 366 | int len; |
| 367 | |
| 368 | netlink_table_grab(); |
| 369 | head = nl_pid_hashfn(hash, pid); |
| 370 | len = 0; |
| 371 | sk_for_each(osk, node, head) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 372 | if (net_eq(sock_net(osk), net) && (nlk_sk(osk)->pid == pid)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | break; |
| 374 | len++; |
| 375 | } |
| 376 | if (node) |
| 377 | goto err; |
| 378 | |
| 379 | err = -EBUSY; |
| 380 | if (nlk_sk(sk)->pid) |
| 381 | goto err; |
| 382 | |
| 383 | err = -ENOMEM; |
| 384 | if (BITS_PER_LONG > 32 && unlikely(hash->entries >= UINT_MAX)) |
| 385 | goto err; |
| 386 | |
| 387 | if (len && nl_pid_hash_dilute(hash, len)) |
| 388 | head = nl_pid_hashfn(hash, pid); |
| 389 | hash->entries++; |
| 390 | nlk_sk(sk)->pid = pid; |
| 391 | sk_add_node(sk, head); |
| 392 | err = 0; |
| 393 | |
| 394 | err: |
| 395 | netlink_table_ungrab(); |
| 396 | return err; |
| 397 | } |
| 398 | |
| 399 | static void netlink_remove(struct sock *sk) |
| 400 | { |
| 401 | netlink_table_grab(); |
David S. Miller | d470e3b | 2005-06-26 15:31:51 -0700 | [diff] [blame] | 402 | if (sk_del_node_init(sk)) |
| 403 | nl_table[sk->sk_protocol].hash.entries--; |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 404 | if (nlk_sk(sk)->subscriptions) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | __sk_del_bind_node(sk); |
| 406 | netlink_table_ungrab(); |
| 407 | } |
| 408 | |
| 409 | static struct proto netlink_proto = { |
| 410 | .name = "NETLINK", |
| 411 | .owner = THIS_MODULE, |
| 412 | .obj_size = sizeof(struct netlink_sock), |
| 413 | }; |
| 414 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 415 | static int __netlink_create(struct net *net, struct socket *sock, |
| 416 | struct mutex *cb_mutex, int protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | { |
| 418 | struct sock *sk; |
| 419 | struct netlink_sock *nlk; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 420 | |
| 421 | sock->ops = &netlink_ops; |
| 422 | |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 423 | sk = sk_alloc(net, PF_NETLINK, GFP_KERNEL, &netlink_proto); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 424 | if (!sk) |
| 425 | return -ENOMEM; |
| 426 | |
| 427 | sock_init_data(sock, sk); |
| 428 | |
| 429 | nlk = nlk_sk(sk); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 430 | if (cb_mutex) { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 431 | nlk->cb_mutex = cb_mutex; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 432 | } else { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 433 | nlk->cb_mutex = &nlk->cb_def_mutex; |
| 434 | mutex_init(nlk->cb_mutex); |
| 435 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 436 | init_waitqueue_head(&nlk->wait); |
| 437 | |
| 438 | sk->sk_destruct = netlink_sock_destruct; |
| 439 | sk->sk_protocol = protocol; |
| 440 | return 0; |
| 441 | } |
| 442 | |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 443 | static int netlink_create(struct net *net, struct socket *sock, int protocol, |
| 444 | int kern) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 445 | { |
| 446 | struct module *module = NULL; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 447 | struct mutex *cb_mutex; |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 448 | struct netlink_sock *nlk; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 449 | void (*bind)(int group); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 450 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
| 452 | sock->state = SS_UNCONNECTED; |
| 453 | |
| 454 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) |
| 455 | return -ESOCKTNOSUPPORT; |
| 456 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 457 | if (protocol < 0 || protocol >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | return -EPROTONOSUPPORT; |
| 459 | |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 460 | netlink_lock_table(); |
Johannes Berg | 95a5afc | 2008-10-16 15:24:51 -0700 | [diff] [blame] | 461 | #ifdef CONFIG_MODULES |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 462 | if (!nl_table[protocol].registered) { |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 463 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 464 | request_module("net-pf-%d-proto-%d", PF_NETLINK, protocol); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 465 | netlink_lock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 466 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 467 | #endif |
| 468 | if (nl_table[protocol].registered && |
| 469 | try_module_get(nl_table[protocol].module)) |
| 470 | module = nl_table[protocol].module; |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 471 | else |
| 472 | err = -EPROTONOSUPPORT; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 473 | cb_mutex = nl_table[protocol].cb_mutex; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 474 | bind = nl_table[protocol].bind; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 475 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 476 | |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 477 | if (err < 0) |
| 478 | goto out; |
| 479 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 480 | err = __netlink_create(net, sock, cb_mutex, protocol); |
| 481 | if (err < 0) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 482 | goto out_module; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 484 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 485 | sock_prot_inuse_add(net, &netlink_proto, 1); |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 486 | local_bh_enable(); |
| 487 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 488 | nlk = nlk_sk(sock->sk); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 489 | nlk->module = module; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 490 | nlk->netlink_bind = bind; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 491 | out: |
| 492 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 494 | out_module: |
| 495 | module_put(module); |
| 496 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | } |
| 498 | |
| 499 | static int netlink_release(struct socket *sock) |
| 500 | { |
| 501 | struct sock *sk = sock->sk; |
| 502 | struct netlink_sock *nlk; |
| 503 | |
| 504 | if (!sk) |
| 505 | return 0; |
| 506 | |
| 507 | netlink_remove(sk); |
Denis Lunev | ac57b3a | 2007-04-18 17:05:58 -0700 | [diff] [blame] | 508 | sock_orphan(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | nlk = nlk_sk(sk); |
| 510 | |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 511 | /* |
| 512 | * OK. Socket is unlinked, any packets that arrive now |
| 513 | * will be purged. |
| 514 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | sock->sk = NULL; |
| 517 | wake_up_interruptible_all(&nlk->wait); |
| 518 | |
| 519 | skb_queue_purge(&sk->sk_write_queue); |
| 520 | |
Johannes Berg | 649300b | 2009-11-16 12:05:34 +0000 | [diff] [blame] | 521 | if (nlk->pid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | struct netlink_notify n = { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 523 | .net = sock_net(sk), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | .protocol = sk->sk_protocol, |
| 525 | .pid = nlk->pid, |
| 526 | }; |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 527 | atomic_notifier_call_chain(&netlink_chain, |
| 528 | NETLINK_URELEASE, &n); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 529 | } |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 530 | |
Mariusz Kozlowski | 5e7c001 | 2007-01-02 15:24:30 -0800 | [diff] [blame] | 531 | module_put(nlk->module); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 532 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 533 | netlink_table_grab(); |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 534 | if (netlink_is_kernel(sk)) { |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 535 | BUG_ON(nl_table[sk->sk_protocol].registered == 0); |
| 536 | if (--nl_table[sk->sk_protocol].registered == 0) { |
| 537 | kfree(nl_table[sk->sk_protocol].listeners); |
| 538 | nl_table[sk->sk_protocol].module = NULL; |
| 539 | nl_table[sk->sk_protocol].registered = 0; |
| 540 | } |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 541 | } else if (nlk->subscriptions) { |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 542 | netlink_update_listeners(sk); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 543 | } |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 544 | netlink_table_ungrab(); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 545 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 546 | kfree(nlk->groups); |
| 547 | nlk->groups = NULL; |
| 548 | |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 549 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 550 | sock_prot_inuse_add(sock_net(sk), &netlink_proto, -1); |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 551 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | sock_put(sk); |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | static int netlink_autobind(struct socket *sock) |
| 557 | { |
| 558 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 559 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | struct nl_pid_hash *hash = &nl_table[sk->sk_protocol].hash; |
| 561 | struct hlist_head *head; |
| 562 | struct sock *osk; |
| 563 | struct hlist_node *node; |
Tom Goff | 66aa4a5 | 2010-03-19 15:38:50 +0000 | [diff] [blame] | 564 | s32 pid = task_tgid_vnr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | int err; |
| 566 | static s32 rover = -4097; |
| 567 | |
| 568 | retry: |
| 569 | cond_resched(); |
| 570 | netlink_table_grab(); |
| 571 | head = nl_pid_hashfn(hash, pid); |
| 572 | sk_for_each(osk, node, head) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 573 | if (!net_eq(sock_net(osk), net)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 574 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | if (nlk_sk(osk)->pid == pid) { |
| 576 | /* Bind collision, search negative pid values. */ |
| 577 | pid = rover--; |
| 578 | if (rover > -4097) |
| 579 | rover = -4097; |
| 580 | netlink_table_ungrab(); |
| 581 | goto retry; |
| 582 | } |
| 583 | } |
| 584 | netlink_table_ungrab(); |
| 585 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 586 | err = netlink_insert(sk, net, pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 587 | if (err == -EADDRINUSE) |
| 588 | goto retry; |
David S. Miller | d470e3b | 2005-06-26 15:31:51 -0700 | [diff] [blame] | 589 | |
| 590 | /* If 2 threads race to autobind, that is fine. */ |
| 591 | if (err == -EBUSY) |
| 592 | err = 0; |
| 593 | |
| 594 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | } |
| 596 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 597 | static inline int netlink_capable(const struct socket *sock, unsigned int flag) |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 598 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | return (nl_table[sock->sk->sk_protocol].nl_nonroot & flag) || |
| 600 | capable(CAP_NET_ADMIN); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 601 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 603 | static void |
| 604 | netlink_update_subscriptions(struct sock *sk, unsigned int subscriptions) |
| 605 | { |
| 606 | struct netlink_sock *nlk = nlk_sk(sk); |
| 607 | |
| 608 | if (nlk->subscriptions && !subscriptions) |
| 609 | __sk_del_bind_node(sk); |
| 610 | else if (!nlk->subscriptions && subscriptions) |
| 611 | sk_add_bind_node(sk, &nl_table[sk->sk_protocol].mc_list); |
| 612 | nlk->subscriptions = subscriptions; |
| 613 | } |
| 614 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 615 | static int netlink_realloc_groups(struct sock *sk) |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 616 | { |
| 617 | struct netlink_sock *nlk = nlk_sk(sk); |
| 618 | unsigned int groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 619 | unsigned long *new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 620 | int err = 0; |
| 621 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 622 | netlink_table_grab(); |
| 623 | |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 624 | groups = nl_table[sk->sk_protocol].groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 625 | if (!nl_table[sk->sk_protocol].registered) { |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 626 | err = -ENOENT; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 627 | goto out_unlock; |
| 628 | } |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 629 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 630 | if (nlk->ngroups >= groups) |
| 631 | goto out_unlock; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 632 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 633 | new_groups = krealloc(nlk->groups, NLGRPSZ(groups), GFP_ATOMIC); |
| 634 | if (new_groups == NULL) { |
| 635 | err = -ENOMEM; |
| 636 | goto out_unlock; |
| 637 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 638 | memset((char *)new_groups + NLGRPSZ(nlk->ngroups), 0, |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 639 | NLGRPSZ(groups) - NLGRPSZ(nlk->ngroups)); |
| 640 | |
| 641 | nlk->groups = new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 642 | nlk->ngroups = groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 643 | out_unlock: |
| 644 | netlink_table_ungrab(); |
| 645 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 646 | } |
| 647 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 648 | static int netlink_bind(struct socket *sock, struct sockaddr *addr, |
| 649 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | { |
| 651 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 652 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | struct netlink_sock *nlk = nlk_sk(sk); |
| 654 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
| 655 | int err; |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 656 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | if (nladdr->nl_family != AF_NETLINK) |
| 658 | return -EINVAL; |
| 659 | |
| 660 | /* Only superuser is allowed to listen multicasts */ |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 661 | if (nladdr->nl_groups) { |
| 662 | if (!netlink_capable(sock, NL_NONROOT_RECV)) |
| 663 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 664 | err = netlink_realloc_groups(sk); |
| 665 | if (err) |
| 666 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 667 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | |
| 669 | if (nlk->pid) { |
| 670 | if (nladdr->nl_pid != nlk->pid) |
| 671 | return -EINVAL; |
| 672 | } else { |
| 673 | err = nladdr->nl_pid ? |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 674 | netlink_insert(sk, net, nladdr->nl_pid) : |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | netlink_autobind(sock); |
| 676 | if (err) |
| 677 | return err; |
| 678 | } |
| 679 | |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 680 | if (!nladdr->nl_groups && (nlk->groups == NULL || !(u32)nlk->groups[0])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | return 0; |
| 682 | |
| 683 | netlink_table_grab(); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 684 | netlink_update_subscriptions(sk, nlk->subscriptions + |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 685 | hweight32(nladdr->nl_groups) - |
| 686 | hweight32(nlk->groups[0])); |
| 687 | nlk->groups[0] = (nlk->groups[0] & ~0xffffffffUL) | nladdr->nl_groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 688 | netlink_update_listeners(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | netlink_table_ungrab(); |
| 690 | |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 691 | if (nlk->netlink_bind && nlk->groups[0]) { |
| 692 | int i; |
| 693 | |
| 694 | for (i=0; i<nlk->ngroups; i++) { |
| 695 | if (test_bit(i, nlk->groups)) |
| 696 | nlk->netlink_bind(i); |
| 697 | } |
| 698 | } |
| 699 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | return 0; |
| 701 | } |
| 702 | |
| 703 | static int netlink_connect(struct socket *sock, struct sockaddr *addr, |
| 704 | int alen, int flags) |
| 705 | { |
| 706 | int err = 0; |
| 707 | struct sock *sk = sock->sk; |
| 708 | struct netlink_sock *nlk = nlk_sk(sk); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 709 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
Changli Gao | 6503d96 | 2010-03-31 22:58:26 +0000 | [diff] [blame] | 711 | if (alen < sizeof(addr->sa_family)) |
| 712 | return -EINVAL; |
| 713 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | if (addr->sa_family == AF_UNSPEC) { |
| 715 | sk->sk_state = NETLINK_UNCONNECTED; |
| 716 | nlk->dst_pid = 0; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 717 | nlk->dst_group = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | return 0; |
| 719 | } |
| 720 | if (addr->sa_family != AF_NETLINK) |
| 721 | return -EINVAL; |
| 722 | |
| 723 | /* Only superuser is allowed to send multicasts */ |
| 724 | if (nladdr->nl_groups && !netlink_capable(sock, NL_NONROOT_SEND)) |
| 725 | return -EPERM; |
| 726 | |
| 727 | if (!nlk->pid) |
| 728 | err = netlink_autobind(sock); |
| 729 | |
| 730 | if (err == 0) { |
| 731 | sk->sk_state = NETLINK_CONNECTED; |
| 732 | nlk->dst_pid = nladdr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 733 | nlk->dst_group = ffs(nladdr->nl_groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | } |
| 735 | |
| 736 | return err; |
| 737 | } |
| 738 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 739 | static int netlink_getname(struct socket *sock, struct sockaddr *addr, |
| 740 | int *addr_len, int peer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | { |
| 742 | struct sock *sk = sock->sk; |
| 743 | struct netlink_sock *nlk = nlk_sk(sk); |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 744 | DECLARE_SOCKADDR(struct sockaddr_nl *, nladdr, addr); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 745 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 746 | nladdr->nl_family = AF_NETLINK; |
| 747 | nladdr->nl_pad = 0; |
| 748 | *addr_len = sizeof(*nladdr); |
| 749 | |
| 750 | if (peer) { |
| 751 | nladdr->nl_pid = nlk->dst_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 752 | nladdr->nl_groups = netlink_group_mask(nlk->dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 753 | } else { |
| 754 | nladdr->nl_pid = nlk->pid; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 755 | nladdr->nl_groups = nlk->groups ? nlk->groups[0] : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | } |
| 757 | return 0; |
| 758 | } |
| 759 | |
| 760 | static void netlink_overrun(struct sock *sk) |
| 761 | { |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 762 | struct netlink_sock *nlk = nlk_sk(sk); |
| 763 | |
| 764 | if (!(nlk->flags & NETLINK_RECV_NO_ENOBUFS)) { |
| 765 | if (!test_and_set_bit(0, &nlk_sk(sk)->state)) { |
| 766 | sk->sk_err = ENOBUFS; |
| 767 | sk->sk_error_report(sk); |
| 768 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | } |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 770 | atomic_inc(&sk->sk_drops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | } |
| 772 | |
| 773 | static struct sock *netlink_getsockbypid(struct sock *ssk, u32 pid) |
| 774 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | struct sock *sock; |
| 776 | struct netlink_sock *nlk; |
| 777 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 778 | sock = netlink_lookup(sock_net(ssk), ssk->sk_protocol, pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | if (!sock) |
| 780 | return ERR_PTR(-ECONNREFUSED); |
| 781 | |
| 782 | /* Don't bother queuing skb if kernel socket has no input function */ |
| 783 | nlk = nlk_sk(sock); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 784 | if (sock->sk_state == NETLINK_CONNECTED && |
| 785 | nlk->dst_pid != nlk_sk(ssk)->pid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | sock_put(sock); |
| 787 | return ERR_PTR(-ECONNREFUSED); |
| 788 | } |
| 789 | return sock; |
| 790 | } |
| 791 | |
| 792 | struct sock *netlink_getsockbyfilp(struct file *filp) |
| 793 | { |
Josef Sipek | 6db5fc5 | 2006-12-08 02:37:25 -0800 | [diff] [blame] | 794 | struct inode *inode = filp->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | struct sock *sock; |
| 796 | |
| 797 | if (!S_ISSOCK(inode->i_mode)) |
| 798 | return ERR_PTR(-ENOTSOCK); |
| 799 | |
| 800 | sock = SOCKET_I(inode)->sk; |
| 801 | if (sock->sk_family != AF_NETLINK) |
| 802 | return ERR_PTR(-EINVAL); |
| 803 | |
| 804 | sock_hold(sock); |
| 805 | return sock; |
| 806 | } |
| 807 | |
| 808 | /* |
| 809 | * Attach a skb to a netlink socket. |
| 810 | * The caller must hold a reference to the destination socket. On error, the |
| 811 | * reference is dropped. The skb is not send to the destination, just all |
| 812 | * all error checks are performed and memory in the queue is reserved. |
| 813 | * Return values: |
| 814 | * < 0: error. skb freed, reference to sock dropped. |
| 815 | * 0: continue |
| 816 | * 1: repeat lookup - reference dropped while waiting for socket memory. |
| 817 | */ |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 818 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 819 | long *timeo, struct sock *ssk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | { |
| 821 | struct netlink_sock *nlk; |
| 822 | |
| 823 | nlk = nlk_sk(sk); |
| 824 | |
| 825 | if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
| 826 | test_bit(0, &nlk->state)) { |
| 827 | DECLARE_WAITQUEUE(wait, current); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 828 | if (!*timeo) { |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 829 | if (!ssk || netlink_is_kernel(ssk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | netlink_overrun(sk); |
| 831 | sock_put(sk); |
| 832 | kfree_skb(skb); |
| 833 | return -EAGAIN; |
| 834 | } |
| 835 | |
| 836 | __set_current_state(TASK_INTERRUPTIBLE); |
| 837 | add_wait_queue(&nlk->wait, &wait); |
| 838 | |
| 839 | if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
| 840 | test_bit(0, &nlk->state)) && |
| 841 | !sock_flag(sk, SOCK_DEAD)) |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 842 | *timeo = schedule_timeout(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | |
| 844 | __set_current_state(TASK_RUNNING); |
| 845 | remove_wait_queue(&nlk->wait, &wait); |
| 846 | sock_put(sk); |
| 847 | |
| 848 | if (signal_pending(current)) { |
| 849 | kfree_skb(skb); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 850 | return sock_intr_errno(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | } |
| 852 | return 1; |
| 853 | } |
| 854 | skb_set_owner_r(skb, sk); |
| 855 | return 0; |
| 856 | } |
| 857 | |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 858 | static int __netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 859 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | int len = skb->len; |
| 861 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | skb_queue_tail(&sk->sk_receive_queue, skb); |
| 863 | sk->sk_data_ready(sk, len); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 864 | return len; |
| 865 | } |
| 866 | |
| 867 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
| 868 | { |
| 869 | int len = __netlink_sendskb(sk, skb); |
| 870 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | sock_put(sk); |
| 872 | return len; |
| 873 | } |
| 874 | |
| 875 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb) |
| 876 | { |
| 877 | kfree_skb(skb); |
| 878 | sock_put(sk); |
| 879 | } |
| 880 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 881 | 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] | 882 | { |
| 883 | int delta; |
| 884 | |
| 885 | skb_orphan(skb); |
| 886 | |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 887 | delta = skb->end - skb->tail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | if (delta * 2 < skb->truesize) |
| 889 | return skb; |
| 890 | |
| 891 | if (skb_shared(skb)) { |
| 892 | struct sk_buff *nskb = skb_clone(skb, allocation); |
| 893 | if (!nskb) |
| 894 | return skb; |
Eric Dumazet | 8460c00 | 2012-04-19 02:24:28 +0000 | [diff] [blame] | 895 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 896 | skb = nskb; |
| 897 | } |
| 898 | |
| 899 | if (!pskb_expand_head(skb, 0, -delta, allocation)) |
| 900 | skb->truesize -= delta; |
| 901 | |
| 902 | return skb; |
| 903 | } |
| 904 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 905 | static void netlink_rcv_wake(struct sock *sk) |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 906 | { |
| 907 | struct netlink_sock *nlk = nlk_sk(sk); |
| 908 | |
| 909 | if (skb_queue_empty(&sk->sk_receive_queue)) |
| 910 | clear_bit(0, &nlk->state); |
| 911 | if (!test_bit(0, &nlk->state)) |
| 912 | wake_up_interruptible(&nlk->wait); |
| 913 | } |
| 914 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 915 | static int netlink_unicast_kernel(struct sock *sk, struct sk_buff *skb) |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 916 | { |
| 917 | int ret; |
| 918 | struct netlink_sock *nlk = nlk_sk(sk); |
| 919 | |
| 920 | ret = -ECONNREFUSED; |
| 921 | if (nlk->netlink_rcv != NULL) { |
| 922 | ret = skb->len; |
| 923 | skb_set_owner_r(skb, sk); |
| 924 | nlk->netlink_rcv(skb); |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 925 | consume_skb(skb); |
| 926 | } else { |
| 927 | kfree_skb(skb); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 928 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 929 | sock_put(sk); |
| 930 | return ret; |
| 931 | } |
| 932 | |
| 933 | int netlink_unicast(struct sock *ssk, struct sk_buff *skb, |
| 934 | u32 pid, int nonblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | { |
| 936 | struct sock *sk; |
| 937 | int err; |
| 938 | long timeo; |
| 939 | |
| 940 | skb = netlink_trim(skb, gfp_any()); |
| 941 | |
| 942 | timeo = sock_sndtimeo(ssk, nonblock); |
| 943 | retry: |
| 944 | sk = netlink_getsockbypid(ssk, pid); |
| 945 | if (IS_ERR(sk)) { |
| 946 | kfree_skb(skb); |
| 947 | return PTR_ERR(sk); |
| 948 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 949 | if (netlink_is_kernel(sk)) |
| 950 | return netlink_unicast_kernel(sk, skb); |
| 951 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 952 | if (sk_filter(sk, skb)) { |
Wang Chen | 8487460 | 2008-07-01 19:55:09 -0700 | [diff] [blame] | 953 | err = skb->len; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 954 | kfree_skb(skb); |
| 955 | sock_put(sk); |
| 956 | return err; |
| 957 | } |
| 958 | |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 959 | err = netlink_attachskb(sk, skb, &timeo, ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | if (err == 1) |
| 961 | goto retry; |
| 962 | if (err) |
| 963 | return err; |
| 964 | |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 965 | return netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 967 | EXPORT_SYMBOL(netlink_unicast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 969 | int netlink_has_listeners(struct sock *sk, unsigned int group) |
| 970 | { |
| 971 | int res = 0; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 972 | struct listeners *listeners; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 973 | |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 974 | BUG_ON(!netlink_is_kernel(sk)); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 975 | |
| 976 | rcu_read_lock(); |
| 977 | listeners = rcu_dereference(nl_table[sk->sk_protocol].listeners); |
| 978 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 979 | if (group - 1 < nl_table[sk->sk_protocol].groups) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 980 | res = test_bit(group - 1, listeners->masks); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 981 | |
| 982 | rcu_read_unlock(); |
| 983 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 984 | return res; |
| 985 | } |
| 986 | EXPORT_SYMBOL_GPL(netlink_has_listeners); |
| 987 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 988 | static int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | { |
| 990 | struct netlink_sock *nlk = nlk_sk(sk); |
| 991 | |
| 992 | if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf && |
| 993 | !test_bit(0, &nlk->state)) { |
| 994 | skb_set_owner_r(skb, sk); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 995 | __netlink_sendskb(sk, skb); |
stephen hemminger | 2c645800 | 2011-12-22 08:52:03 +0000 | [diff] [blame] | 996 | return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | } |
| 998 | return -1; |
| 999 | } |
| 1000 | |
| 1001 | struct netlink_broadcast_data { |
| 1002 | struct sock *exclude_sk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1003 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | u32 pid; |
| 1005 | u32 group; |
| 1006 | int failure; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1007 | int delivery_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1008 | int congested; |
| 1009 | int delivered; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 1010 | gfp_t allocation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1011 | struct sk_buff *skb, *skb2; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1012 | int (*tx_filter)(struct sock *dsk, struct sk_buff *skb, void *data); |
| 1013 | void *tx_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | }; |
| 1015 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1016 | static int do_one_broadcast(struct sock *sk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | struct netlink_broadcast_data *p) |
| 1018 | { |
| 1019 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1020 | int val; |
| 1021 | |
| 1022 | if (p->exclude_sk == sk) |
| 1023 | goto out; |
| 1024 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1025 | if (nlk->pid == p->pid || p->group - 1 >= nlk->ngroups || |
| 1026 | !test_bit(p->group - 1, nlk->groups)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | goto out; |
| 1028 | |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1029 | if (!net_eq(sock_net(sk), p->net)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1030 | goto out; |
| 1031 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | if (p->failure) { |
| 1033 | netlink_overrun(sk); |
| 1034 | goto out; |
| 1035 | } |
| 1036 | |
| 1037 | sock_hold(sk); |
| 1038 | if (p->skb2 == NULL) { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1039 | if (skb_shared(p->skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1040 | p->skb2 = skb_clone(p->skb, p->allocation); |
| 1041 | } else { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1042 | p->skb2 = skb_get(p->skb); |
| 1043 | /* |
| 1044 | * skb ownership may have been set when |
| 1045 | * delivered to a previous socket. |
| 1046 | */ |
| 1047 | skb_orphan(p->skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | } |
| 1049 | } |
| 1050 | if (p->skb2 == NULL) { |
| 1051 | netlink_overrun(sk); |
| 1052 | /* Clone failed. Notify ALL listeners. */ |
| 1053 | p->failure = 1; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1054 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1055 | p->delivery_failure = 1; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1056 | } else if (p->tx_filter && p->tx_filter(sk, p->skb2, p->tx_data)) { |
| 1057 | kfree_skb(p->skb2); |
| 1058 | p->skb2 = NULL; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1059 | } else if (sk_filter(sk, p->skb2)) { |
| 1060 | kfree_skb(p->skb2); |
| 1061 | p->skb2 = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | } else if ((val = netlink_broadcast_deliver(sk, p->skb2)) < 0) { |
| 1063 | netlink_overrun(sk); |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1064 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1065 | p->delivery_failure = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1066 | } else { |
| 1067 | p->congested |= val; |
| 1068 | p->delivered = 1; |
| 1069 | p->skb2 = NULL; |
| 1070 | } |
| 1071 | sock_put(sk); |
| 1072 | |
| 1073 | out: |
| 1074 | return 0; |
| 1075 | } |
| 1076 | |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1077 | int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, u32 pid, |
| 1078 | u32 group, gfp_t allocation, |
| 1079 | int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), |
| 1080 | void *filter_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1081 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1082 | struct net *net = sock_net(ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | struct netlink_broadcast_data info; |
| 1084 | struct hlist_node *node; |
| 1085 | struct sock *sk; |
| 1086 | |
| 1087 | skb = netlink_trim(skb, allocation); |
| 1088 | |
| 1089 | info.exclude_sk = ssk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1090 | info.net = net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | info.pid = pid; |
| 1092 | info.group = group; |
| 1093 | info.failure = 0; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1094 | info.delivery_failure = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | info.congested = 0; |
| 1096 | info.delivered = 0; |
| 1097 | info.allocation = allocation; |
| 1098 | info.skb = skb; |
| 1099 | info.skb2 = NULL; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1100 | info.tx_filter = filter; |
| 1101 | info.tx_data = filter_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | |
| 1103 | /* While we sleep in clone, do not allow to change socket list */ |
| 1104 | |
| 1105 | netlink_lock_table(); |
| 1106 | |
| 1107 | sk_for_each_bound(sk, node, &nl_table[ssk->sk_protocol].mc_list) |
| 1108 | do_one_broadcast(sk, &info); |
| 1109 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 1110 | consume_skb(skb); |
Tommy S. Christensen | aa1c6a6 | 2005-05-19 13:07:32 -0700 | [diff] [blame] | 1111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | netlink_unlock_table(); |
| 1113 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 1114 | if (info.delivery_failure) { |
| 1115 | kfree_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1116 | return -ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1117 | } |
| 1118 | consume_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | if (info.delivered) { |
| 1121 | if (info.congested && (allocation & __GFP_WAIT)) |
| 1122 | yield(); |
| 1123 | return 0; |
| 1124 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1125 | return -ESRCH; |
| 1126 | } |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1127 | EXPORT_SYMBOL(netlink_broadcast_filtered); |
| 1128 | |
| 1129 | int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 pid, |
| 1130 | u32 group, gfp_t allocation) |
| 1131 | { |
| 1132 | return netlink_broadcast_filtered(ssk, skb, pid, group, allocation, |
| 1133 | NULL, NULL); |
| 1134 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1135 | EXPORT_SYMBOL(netlink_broadcast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | |
| 1137 | struct netlink_set_err_data { |
| 1138 | struct sock *exclude_sk; |
| 1139 | u32 pid; |
| 1140 | u32 group; |
| 1141 | int code; |
| 1142 | }; |
| 1143 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1144 | 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] | 1145 | { |
| 1146 | struct netlink_sock *nlk = nlk_sk(sk); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1147 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1148 | |
| 1149 | if (sk == p->exclude_sk) |
| 1150 | goto out; |
| 1151 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1152 | if (!net_eq(sock_net(sk), sock_net(p->exclude_sk))) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1153 | goto out; |
| 1154 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1155 | if (nlk->pid == p->pid || p->group - 1 >= nlk->ngroups || |
| 1156 | !test_bit(p->group - 1, nlk->groups)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1157 | goto out; |
| 1158 | |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1159 | if (p->code == ENOBUFS && nlk->flags & NETLINK_RECV_NO_ENOBUFS) { |
| 1160 | ret = 1; |
| 1161 | goto out; |
| 1162 | } |
| 1163 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | sk->sk_err = p->code; |
| 1165 | sk->sk_error_report(sk); |
| 1166 | out: |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1167 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1168 | } |
| 1169 | |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 1170 | /** |
| 1171 | * netlink_set_err - report error to broadcast listeners |
| 1172 | * @ssk: the kernel netlink socket, as returned by netlink_kernel_create() |
| 1173 | * @pid: the PID of a process that we want to skip (if any) |
| 1174 | * @groups: the broadcast group that will notice the error |
| 1175 | * @code: error code, must be negative (as usual in kernelspace) |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1176 | * |
| 1177 | * This function returns the number of broadcast listeners that have set the |
| 1178 | * NETLINK_RECV_NO_ENOBUFS socket option. |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 1179 | */ |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1180 | int netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | { |
| 1182 | struct netlink_set_err_data info; |
| 1183 | struct hlist_node *node; |
| 1184 | struct sock *sk; |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1185 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | |
| 1187 | info.exclude_sk = ssk; |
| 1188 | info.pid = pid; |
| 1189 | info.group = group; |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 1190 | /* sk->sk_err wants a positive error value */ |
| 1191 | info.code = -code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | |
| 1193 | read_lock(&nl_table_lock); |
| 1194 | |
| 1195 | sk_for_each_bound(sk, node, &nl_table[ssk->sk_protocol].mc_list) |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1196 | ret += do_one_set_err(sk, &info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | |
| 1198 | read_unlock(&nl_table_lock); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1199 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | } |
Pablo Neira Ayuso | dd5b6ce | 2009-03-23 13:21:06 +0100 | [diff] [blame] | 1201 | EXPORT_SYMBOL(netlink_set_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1203 | /* must be called with netlink table grabbed */ |
| 1204 | static void netlink_update_socket_mc(struct netlink_sock *nlk, |
| 1205 | unsigned int group, |
| 1206 | int is_new) |
| 1207 | { |
| 1208 | int old, new = !!is_new, subscriptions; |
| 1209 | |
| 1210 | old = test_bit(group - 1, nlk->groups); |
| 1211 | subscriptions = nlk->subscriptions - old + new; |
| 1212 | if (new) |
| 1213 | __set_bit(group - 1, nlk->groups); |
| 1214 | else |
| 1215 | __clear_bit(group - 1, nlk->groups); |
| 1216 | netlink_update_subscriptions(&nlk->sk, subscriptions); |
| 1217 | netlink_update_listeners(&nlk->sk); |
| 1218 | } |
| 1219 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1220 | static int netlink_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1221 | char __user *optval, unsigned int optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1222 | { |
| 1223 | struct sock *sk = sock->sk; |
| 1224 | struct netlink_sock *nlk = nlk_sk(sk); |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 1225 | unsigned int val = 0; |
| 1226 | int err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1227 | |
| 1228 | if (level != SOL_NETLINK) |
| 1229 | return -ENOPROTOOPT; |
| 1230 | |
| 1231 | if (optlen >= sizeof(int) && |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 1232 | get_user(val, (unsigned int __user *)optval)) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1233 | return -EFAULT; |
| 1234 | |
| 1235 | switch (optname) { |
| 1236 | case NETLINK_PKTINFO: |
| 1237 | if (val) |
| 1238 | nlk->flags |= NETLINK_RECV_PKTINFO; |
| 1239 | else |
| 1240 | nlk->flags &= ~NETLINK_RECV_PKTINFO; |
| 1241 | err = 0; |
| 1242 | break; |
| 1243 | case NETLINK_ADD_MEMBERSHIP: |
| 1244 | case NETLINK_DROP_MEMBERSHIP: { |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1245 | if (!netlink_capable(sock, NL_NONROOT_RECV)) |
| 1246 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1247 | err = netlink_realloc_groups(sk); |
| 1248 | if (err) |
| 1249 | return err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1250 | if (!val || val - 1 >= nlk->ngroups) |
| 1251 | return -EINVAL; |
| 1252 | netlink_table_grab(); |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1253 | netlink_update_socket_mc(nlk, val, |
| 1254 | optname == NETLINK_ADD_MEMBERSHIP); |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1255 | netlink_table_ungrab(); |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 1256 | |
| 1257 | if (nlk->netlink_bind) |
| 1258 | nlk->netlink_bind(val); |
| 1259 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1260 | err = 0; |
| 1261 | break; |
| 1262 | } |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1263 | case NETLINK_BROADCAST_ERROR: |
| 1264 | if (val) |
| 1265 | nlk->flags |= NETLINK_BROADCAST_SEND_ERROR; |
| 1266 | else |
| 1267 | nlk->flags &= ~NETLINK_BROADCAST_SEND_ERROR; |
| 1268 | err = 0; |
| 1269 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1270 | case NETLINK_NO_ENOBUFS: |
| 1271 | if (val) { |
| 1272 | nlk->flags |= NETLINK_RECV_NO_ENOBUFS; |
| 1273 | clear_bit(0, &nlk->state); |
| 1274 | wake_up_interruptible(&nlk->wait); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1275 | } else { |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1276 | nlk->flags &= ~NETLINK_RECV_NO_ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1277 | } |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1278 | err = 0; |
| 1279 | break; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1280 | default: |
| 1281 | err = -ENOPROTOOPT; |
| 1282 | } |
| 1283 | return err; |
| 1284 | } |
| 1285 | |
| 1286 | static int netlink_getsockopt(struct socket *sock, int level, int optname, |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1287 | char __user *optval, int __user *optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1288 | { |
| 1289 | struct sock *sk = sock->sk; |
| 1290 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1291 | int len, val, err; |
| 1292 | |
| 1293 | if (level != SOL_NETLINK) |
| 1294 | return -ENOPROTOOPT; |
| 1295 | |
| 1296 | if (get_user(len, optlen)) |
| 1297 | return -EFAULT; |
| 1298 | if (len < 0) |
| 1299 | return -EINVAL; |
| 1300 | |
| 1301 | switch (optname) { |
| 1302 | case NETLINK_PKTINFO: |
| 1303 | if (len < sizeof(int)) |
| 1304 | return -EINVAL; |
| 1305 | len = sizeof(int); |
| 1306 | val = nlk->flags & NETLINK_RECV_PKTINFO ? 1 : 0; |
Heiko Carstens | a27b58f | 2006-10-30 15:06:12 -0800 | [diff] [blame] | 1307 | if (put_user(len, optlen) || |
| 1308 | put_user(val, optval)) |
| 1309 | return -EFAULT; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1310 | err = 0; |
| 1311 | break; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1312 | case NETLINK_BROADCAST_ERROR: |
| 1313 | if (len < sizeof(int)) |
| 1314 | return -EINVAL; |
| 1315 | len = sizeof(int); |
| 1316 | val = nlk->flags & NETLINK_BROADCAST_SEND_ERROR ? 1 : 0; |
| 1317 | if (put_user(len, optlen) || |
| 1318 | put_user(val, optval)) |
| 1319 | return -EFAULT; |
| 1320 | err = 0; |
| 1321 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1322 | case NETLINK_NO_ENOBUFS: |
| 1323 | if (len < sizeof(int)) |
| 1324 | return -EINVAL; |
| 1325 | len = sizeof(int); |
| 1326 | val = nlk->flags & NETLINK_RECV_NO_ENOBUFS ? 1 : 0; |
| 1327 | if (put_user(len, optlen) || |
| 1328 | put_user(val, optval)) |
| 1329 | return -EFAULT; |
| 1330 | err = 0; |
| 1331 | break; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1332 | default: |
| 1333 | err = -ENOPROTOOPT; |
| 1334 | } |
| 1335 | return err; |
| 1336 | } |
| 1337 | |
| 1338 | static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
| 1339 | { |
| 1340 | struct nl_pktinfo info; |
| 1341 | |
| 1342 | info.group = NETLINK_CB(skb).dst_group; |
| 1343 | put_cmsg(msg, SOL_NETLINK, NETLINK_PKTINFO, sizeof(info), &info); |
| 1344 | } |
| 1345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1346 | static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock, |
| 1347 | struct msghdr *msg, size_t len) |
| 1348 | { |
| 1349 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 1350 | struct sock *sk = sock->sk; |
| 1351 | struct netlink_sock *nlk = nlk_sk(sk); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1352 | struct sockaddr_nl *addr = msg->msg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | u32 dst_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1354 | u32 dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | struct sk_buff *skb; |
| 1356 | int err; |
| 1357 | struct scm_cookie scm; |
| 1358 | |
| 1359 | if (msg->msg_flags&MSG_OOB) |
| 1360 | return -EOPNOTSUPP; |
| 1361 | |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1362 | if (NULL == siocb->scm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | siocb->scm = &scm; |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1364 | |
Eric Dumazet | e0e3cea | 2012-08-21 06:21:17 +0000 | [diff] [blame] | 1365 | err = scm_send(sock, msg, siocb->scm, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | if (err < 0) |
| 1367 | return err; |
| 1368 | |
| 1369 | if (msg->msg_namelen) { |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1370 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1371 | if (addr->nl_family != AF_NETLINK) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1372 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | dst_pid = addr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1374 | dst_group = ffs(addr->nl_groups); |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1375 | err = -EPERM; |
Pablo Neira Ayuso | 20e1db1 | 2012-08-23 02:09:11 +0000 | [diff] [blame] | 1376 | if ((dst_group || dst_pid) && |
| 1377 | !netlink_capable(sock, NL_NONROOT_SEND)) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1378 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1379 | } else { |
| 1380 | dst_pid = nlk->dst_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1381 | dst_group = nlk->dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | } |
| 1383 | |
| 1384 | if (!nlk->pid) { |
| 1385 | err = netlink_autobind(sock); |
| 1386 | if (err) |
| 1387 | goto out; |
| 1388 | } |
| 1389 | |
| 1390 | err = -EMSGSIZE; |
| 1391 | if (len > sk->sk_sndbuf - 32) |
| 1392 | goto out; |
| 1393 | err = -ENOBUFS; |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 1394 | skb = alloc_skb(len, GFP_KERNEL); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1395 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | goto out; |
| 1397 | |
| 1398 | NETLINK_CB(skb).pid = nlk->pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1399 | NETLINK_CB(skb).dst_group = dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | memcpy(NETLINK_CREDS(skb), &siocb->scm->creds, sizeof(struct ucred)); |
| 1401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | err = -EFAULT; |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1403 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1404 | kfree_skb(skb); |
| 1405 | goto out; |
| 1406 | } |
| 1407 | |
| 1408 | err = security_netlink_send(sk, skb); |
| 1409 | if (err) { |
| 1410 | kfree_skb(skb); |
| 1411 | goto out; |
| 1412 | } |
| 1413 | |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1414 | if (dst_group) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1415 | atomic_inc(&skb->users); |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1416 | netlink_broadcast(sk, skb, dst_pid, dst_group, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | } |
| 1418 | err = netlink_unicast(sk, skb, dst_pid, msg->msg_flags&MSG_DONTWAIT); |
| 1419 | |
| 1420 | out: |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1421 | scm_destroy(siocb->scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1422 | return err; |
| 1423 | } |
| 1424 | |
| 1425 | static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock, |
| 1426 | struct msghdr *msg, size_t len, |
| 1427 | int flags) |
| 1428 | { |
| 1429 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 1430 | struct scm_cookie scm; |
| 1431 | struct sock *sk = sock->sk; |
| 1432 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1433 | int noblock = flags&MSG_DONTWAIT; |
| 1434 | size_t copied; |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1435 | struct sk_buff *skb, *data_skb; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1436 | int err, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | |
| 1438 | if (flags&MSG_OOB) |
| 1439 | return -EOPNOTSUPP; |
| 1440 | |
| 1441 | copied = 0; |
| 1442 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1443 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
| 1444 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1445 | goto out; |
| 1446 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1447 | data_skb = skb; |
| 1448 | |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1449 | #ifdef CONFIG_COMPAT_NETLINK_MESSAGES |
| 1450 | if (unlikely(skb_shinfo(skb)->frag_list)) { |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1451 | /* |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1452 | * If this skb has a frag_list, then here that means that we |
| 1453 | * will have to use the frag_list skb's data for compat tasks |
| 1454 | * and the regular skb's data for normal (non-compat) tasks. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1455 | * |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1456 | * If we need to send the compat skb, assign it to the |
| 1457 | * 'data_skb' variable so that it will be used below for data |
| 1458 | * copying. We keep 'skb' for everything else, including |
| 1459 | * freeing both later. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1460 | */ |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1461 | if (flags & MSG_CMSG_COMPAT) |
| 1462 | data_skb = skb_shinfo(skb)->frag_list; |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1463 | } |
| 1464 | #endif |
| 1465 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1466 | msg->msg_namelen = 0; |
| 1467 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1468 | copied = data_skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | if (len < copied) { |
| 1470 | msg->msg_flags |= MSG_TRUNC; |
| 1471 | copied = len; |
| 1472 | } |
| 1473 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1474 | skb_reset_transport_header(data_skb); |
| 1475 | err = skb_copy_datagram_iovec(data_skb, 0, msg->msg_iov, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1476 | |
| 1477 | if (msg->msg_name) { |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1478 | struct sockaddr_nl *addr = (struct sockaddr_nl *)msg->msg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | addr->nl_family = AF_NETLINK; |
| 1480 | addr->nl_pad = 0; |
| 1481 | addr->nl_pid = NETLINK_CB(skb).pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1482 | addr->nl_groups = netlink_group_mask(NETLINK_CB(skb).dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | msg->msg_namelen = sizeof(*addr); |
| 1484 | } |
| 1485 | |
Patrick McHardy | cc9a06c | 2006-03-12 20:34:27 -0800 | [diff] [blame] | 1486 | if (nlk->flags & NETLINK_RECV_PKTINFO) |
| 1487 | netlink_cmsg_recv_pktinfo(msg, skb); |
| 1488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | if (NULL == siocb->scm) { |
| 1490 | memset(&scm, 0, sizeof(scm)); |
| 1491 | siocb->scm = &scm; |
| 1492 | } |
| 1493 | siocb->scm->creds = *NETLINK_CREDS(skb); |
Patrick McHardy | 188ccb5 | 2007-05-03 03:27:01 -0700 | [diff] [blame] | 1494 | if (flags & MSG_TRUNC) |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1495 | copied = data_skb->len; |
David S. Miller | daa3766 | 2010-08-15 23:21:50 -0700 | [diff] [blame] | 1496 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | skb_free_datagram(sk, skb); |
| 1498 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1499 | if (nlk->cb && atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2) { |
| 1500 | ret = netlink_dump(sk); |
| 1501 | if (ret) { |
| 1502 | sk->sk_err = ret; |
| 1503 | sk->sk_error_report(sk); |
| 1504 | } |
| 1505 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | |
| 1507 | scm_recv(sock, msg, siocb->scm, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | out: |
| 1509 | netlink_rcv_wake(sk); |
| 1510 | return err ? : copied; |
| 1511 | } |
| 1512 | |
| 1513 | static void netlink_data_ready(struct sock *sk, int len) |
| 1514 | { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1515 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | } |
| 1517 | |
| 1518 | /* |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1519 | * We export these functions to other modules. They provide a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | * complete set of kernel non-blocking support for message |
| 1521 | * queueing. |
| 1522 | */ |
| 1523 | |
| 1524 | struct sock * |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1525 | netlink_kernel_create(struct net *net, int unit, |
| 1526 | struct module *module, |
| 1527 | struct netlink_kernel_cfg *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | { |
| 1529 | struct socket *sock; |
| 1530 | struct sock *sk; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1531 | struct netlink_sock *nlk; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1532 | struct listeners *listeners = NULL; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1533 | struct mutex *cb_mutex = cfg ? cfg->cb_mutex : NULL; |
| 1534 | unsigned int groups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 1536 | BUG_ON(!nl_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1538 | if (unit < 0 || unit >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | return NULL; |
| 1540 | |
| 1541 | if (sock_create_lite(PF_NETLINK, SOCK_DGRAM, unit, &sock)) |
| 1542 | return NULL; |
| 1543 | |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 1544 | /* |
| 1545 | * We have to just have a reference on the net from sk, but don't |
| 1546 | * get_net it. Besides, we cannot get and then put the net here. |
| 1547 | * So we create one inside init_net and the move it to net. |
| 1548 | */ |
| 1549 | |
| 1550 | if (__netlink_create(&init_net, sock, cb_mutex, unit) < 0) |
| 1551 | goto out_sock_release_nosk; |
| 1552 | |
| 1553 | sk = sock->sk; |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1554 | sk_change_net(sk, net); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1555 | |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1556 | if (!cfg || cfg->groups < 32) |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1557 | groups = 32; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1558 | else |
| 1559 | groups = cfg->groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1560 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1561 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1562 | if (!listeners) |
| 1563 | goto out_sock_release; |
| 1564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | sk->sk_data_ready = netlink_data_ready; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1566 | if (cfg && cfg->input) |
| 1567 | nlk_sk(sk)->netlink_rcv = cfg->input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1569 | if (netlink_insert(sk, net, 0)) |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1570 | goto out_sock_release; |
| 1571 | |
| 1572 | nlk = nlk_sk(sk); |
| 1573 | nlk->flags |= NETLINK_KERNEL_SOCKET; |
| 1574 | |
| 1575 | netlink_table_grab(); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1576 | if (!nl_table[unit].registered) { |
| 1577 | nl_table[unit].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1578 | rcu_assign_pointer(nl_table[unit].listeners, listeners); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1579 | nl_table[unit].cb_mutex = cb_mutex; |
| 1580 | nl_table[unit].module = module; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 1581 | nl_table[unit].bind = cfg ? cfg->bind : NULL; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1582 | nl_table[unit].registered = 1; |
Jesper Juhl | f937f1f46 | 2007-10-15 01:39:12 -0700 | [diff] [blame] | 1583 | } else { |
| 1584 | kfree(listeners); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1585 | nl_table[unit].registered++; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1586 | } |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1587 | netlink_table_ungrab(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1588 | return sk; |
| 1589 | |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1590 | out_sock_release: |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1591 | kfree(listeners); |
Denis V. Lunev | 9dfbec1 | 2008-02-29 11:17:56 -0800 | [diff] [blame] | 1592 | netlink_kernel_release(sk); |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 1593 | return NULL; |
| 1594 | |
| 1595 | out_sock_release_nosk: |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1596 | sock_release(sock); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1597 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1598 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1599 | EXPORT_SYMBOL(netlink_kernel_create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1600 | |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 1601 | |
| 1602 | void |
| 1603 | netlink_kernel_release(struct sock *sk) |
| 1604 | { |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1605 | sk_release_kernel(sk); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 1606 | } |
| 1607 | EXPORT_SYMBOL(netlink_kernel_release); |
| 1608 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1609 | int __netlink_change_ngroups(struct sock *sk, unsigned int groups) |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1610 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1611 | struct listeners *new, *old; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1612 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1613 | |
| 1614 | if (groups < 32) |
| 1615 | groups = 32; |
| 1616 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1617 | if (NLGRPSZ(tbl->groups) < NLGRPSZ(groups)) { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1618 | new = kzalloc(sizeof(*new) + NLGRPSZ(groups), GFP_ATOMIC); |
| 1619 | if (!new) |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1620 | return -ENOMEM; |
Eric Dumazet | 33d480c | 2011-08-11 19:30:52 +0000 | [diff] [blame] | 1621 | old = rcu_dereference_protected(tbl->listeners, 1); |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1622 | memcpy(new->masks, old->masks, NLGRPSZ(tbl->groups)); |
| 1623 | rcu_assign_pointer(tbl->listeners, new); |
| 1624 | |
Lai Jiangshan | 37b6b93 | 2011-03-15 18:01:42 +0800 | [diff] [blame] | 1625 | kfree_rcu(old, rcu); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1626 | } |
| 1627 | tbl->groups = groups; |
| 1628 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1629 | return 0; |
| 1630 | } |
| 1631 | |
| 1632 | /** |
| 1633 | * netlink_change_ngroups - change number of multicast groups |
| 1634 | * |
| 1635 | * This changes the number of multicast groups that are available |
| 1636 | * on a certain netlink family. Note that it is not possible to |
| 1637 | * change the number of groups to below 32. Also note that it does |
| 1638 | * not implicitly call netlink_clear_multicast_users() when the |
| 1639 | * number of groups is reduced. |
| 1640 | * |
| 1641 | * @sk: The kernel netlink socket, as returned by netlink_kernel_create(). |
| 1642 | * @groups: The new number of groups. |
| 1643 | */ |
| 1644 | int netlink_change_ngroups(struct sock *sk, unsigned int groups) |
| 1645 | { |
| 1646 | int err; |
| 1647 | |
| 1648 | netlink_table_grab(); |
| 1649 | err = __netlink_change_ngroups(sk, groups); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1650 | netlink_table_ungrab(); |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1651 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1652 | return err; |
| 1653 | } |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1654 | |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 1655 | void __netlink_clear_multicast_users(struct sock *ksk, unsigned int group) |
| 1656 | { |
| 1657 | struct sock *sk; |
| 1658 | struct hlist_node *node; |
| 1659 | struct netlink_table *tbl = &nl_table[ksk->sk_protocol]; |
| 1660 | |
| 1661 | sk_for_each_bound(sk, node, &tbl->mc_list) |
| 1662 | netlink_update_socket_mc(nlk_sk(sk), group, 0); |
| 1663 | } |
| 1664 | |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1665 | /** |
| 1666 | * netlink_clear_multicast_users - kick off multicast listeners |
| 1667 | * |
| 1668 | * This function removes all listeners from the given group. |
| 1669 | * @ksk: The kernel netlink socket, as returned by |
| 1670 | * netlink_kernel_create(). |
| 1671 | * @group: The multicast group to clear. |
| 1672 | */ |
| 1673 | void netlink_clear_multicast_users(struct sock *ksk, unsigned int group) |
| 1674 | { |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1675 | netlink_table_grab(); |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 1676 | __netlink_clear_multicast_users(ksk, group); |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1677 | netlink_table_ungrab(); |
| 1678 | } |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1679 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | void netlink_set_nonroot(int protocol, unsigned int flags) |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1681 | { |
| 1682 | if ((unsigned int)protocol < MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | nl_table[protocol].nl_nonroot = flags; |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1684 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1685 | EXPORT_SYMBOL(netlink_set_nonroot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 1687 | struct nlmsghdr * |
| 1688 | __nlmsg_put(struct sk_buff *skb, u32 pid, u32 seq, int type, int len, int flags) |
| 1689 | { |
| 1690 | struct nlmsghdr *nlh; |
| 1691 | int size = NLMSG_LENGTH(len); |
| 1692 | |
| 1693 | nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); |
| 1694 | nlh->nlmsg_type = type; |
| 1695 | nlh->nlmsg_len = size; |
| 1696 | nlh->nlmsg_flags = flags; |
| 1697 | nlh->nlmsg_pid = pid; |
| 1698 | nlh->nlmsg_seq = seq; |
| 1699 | if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0) |
| 1700 | memset(NLMSG_DATA(nlh) + len, 0, NLMSG_ALIGN(size) - size); |
| 1701 | return nlh; |
| 1702 | } |
| 1703 | EXPORT_SYMBOL(__nlmsg_put); |
| 1704 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1705 | /* |
| 1706 | * It looks a bit ugly. |
| 1707 | * It would be better to create kernel thread. |
| 1708 | */ |
| 1709 | |
| 1710 | static int netlink_dump(struct sock *sk) |
| 1711 | { |
| 1712 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1713 | struct netlink_callback *cb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1714 | struct sk_buff *skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | struct nlmsghdr *nlh; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1716 | int len, err = -ENOBUFS; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1717 | int alloc_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1718 | |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1719 | mutex_lock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | |
| 1721 | cb = nlk->cb; |
| 1722 | if (cb == NULL) { |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1723 | err = -EINVAL; |
| 1724 | goto errout_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | } |
| 1726 | |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1727 | alloc_size = max_t(int, cb->min_dump_alloc, NLMSG_GOODSIZE); |
| 1728 | |
| 1729 | skb = sock_rmalloc(sk, alloc_size, 0, GFP_KERNEL); |
| 1730 | if (!skb) |
Dan Carpenter | c63d6ea | 2011-06-15 03:11:42 +0000 | [diff] [blame] | 1731 | goto errout_skb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1732 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | len = cb->dump(skb, cb); |
| 1734 | |
| 1735 | if (len > 0) { |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1736 | mutex_unlock(nlk->cb_mutex); |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1737 | |
| 1738 | if (sk_filter(sk, skb)) |
| 1739 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1740 | else |
| 1741 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | return 0; |
| 1743 | } |
| 1744 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1745 | nlh = nlmsg_put_answer(skb, cb, NLMSG_DONE, sizeof(len), NLM_F_MULTI); |
| 1746 | if (!nlh) |
| 1747 | goto errout_skb; |
| 1748 | |
Johannes Berg | 670dc28 | 2011-06-20 13:40:46 +0200 | [diff] [blame] | 1749 | nl_dump_check_consistent(cb, nlh); |
| 1750 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1751 | memcpy(nlmsg_data(nlh), &len, sizeof(len)); |
| 1752 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1753 | if (sk_filter(sk, skb)) |
| 1754 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1755 | else |
| 1756 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | |
Thomas Graf | a8f74b2 | 2005-11-10 02:25:52 +0100 | [diff] [blame] | 1758 | if (cb->done) |
| 1759 | cb->done(cb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1760 | nlk->cb = NULL; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1761 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 1763 | netlink_consume_callback(cb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1764 | return 0; |
Thomas Graf | 1797754 | 2005-06-18 22:53:48 -0700 | [diff] [blame] | 1765 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1766 | errout_skb: |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1767 | mutex_unlock(nlk->cb_mutex); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1768 | kfree_skb(skb); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1769 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1770 | } |
| 1771 | |
| 1772 | int netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
Patrick McHardy | 3a6c2b4 | 2009-08-25 16:07:40 +0200 | [diff] [blame] | 1773 | const struct nlmsghdr *nlh, |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 1774 | struct netlink_dump_control *control) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | { |
| 1776 | struct netlink_callback *cb; |
| 1777 | struct sock *sk; |
| 1778 | struct netlink_sock *nlk; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1779 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1780 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 1781 | cb = kzalloc(sizeof(*cb), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | if (cb == NULL) |
| 1783 | return -ENOBUFS; |
| 1784 | |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 1785 | cb->dump = control->dump; |
| 1786 | cb->done = control->done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | cb->nlh = nlh; |
Pablo Neira Ayuso | 7175c88 | 2012-02-24 14:30:16 +0000 | [diff] [blame] | 1788 | cb->data = control->data; |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 1789 | cb->min_dump_alloc = control->min_dump_alloc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | atomic_inc(&skb->users); |
| 1791 | cb->skb = skb; |
| 1792 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1793 | sk = netlink_lookup(sock_net(ssk), ssk->sk_protocol, NETLINK_CB(skb).pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | if (sk == NULL) { |
| 1795 | netlink_destroy_callback(cb); |
| 1796 | return -ECONNREFUSED; |
| 1797 | } |
| 1798 | nlk = nlk_sk(sk); |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 1799 | /* A dump is in progress... */ |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1800 | mutex_lock(nlk->cb_mutex); |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 1801 | if (nlk->cb) { |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1802 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1803 | netlink_destroy_callback(cb); |
| 1804 | sock_put(sk); |
| 1805 | return -EBUSY; |
| 1806 | } |
| 1807 | nlk->cb = cb; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1808 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1810 | ret = netlink_dump(sk); |
| 1811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | sock_put(sk); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1813 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1814 | if (ret) |
| 1815 | return ret; |
| 1816 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1817 | /* We successfully started a dump, by returning -EINTR we |
| 1818 | * signal not to send ACK even if it was requested. |
| 1819 | */ |
| 1820 | return -EINTR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1821 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1822 | EXPORT_SYMBOL(netlink_dump_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | |
| 1824 | void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err) |
| 1825 | { |
| 1826 | struct sk_buff *skb; |
| 1827 | struct nlmsghdr *rep; |
| 1828 | struct nlmsgerr *errmsg; |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 1829 | size_t payload = sizeof(*errmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1830 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 1831 | /* error messages get the original request appened */ |
| 1832 | if (err) |
| 1833 | payload += nlmsg_len(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1834 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 1835 | skb = nlmsg_new(payload, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1836 | if (!skb) { |
| 1837 | struct sock *sk; |
| 1838 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1839 | sk = netlink_lookup(sock_net(in_skb->sk), |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1840 | in_skb->sk->sk_protocol, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | NETLINK_CB(in_skb).pid); |
| 1842 | if (sk) { |
| 1843 | sk->sk_err = ENOBUFS; |
| 1844 | sk->sk_error_report(sk); |
| 1845 | sock_put(sk); |
| 1846 | } |
| 1847 | return; |
| 1848 | } |
| 1849 | |
| 1850 | rep = __nlmsg_put(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq, |
John Fastabend | 5dba93a | 2009-09-25 13:11:44 +0000 | [diff] [blame] | 1851 | NLMSG_ERROR, payload, 0); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1852 | errmsg = nlmsg_data(rep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | errmsg->error = err; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1854 | memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(*nlh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT); |
| 1856 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1857 | EXPORT_SYMBOL(netlink_ack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1859 | 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] | 1860 | struct nlmsghdr *)) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1861 | { |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1862 | struct nlmsghdr *nlh; |
| 1863 | int err; |
| 1864 | |
| 1865 | while (skb->len >= nlmsg_total_size(0)) { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1866 | int msglen; |
| 1867 | |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 1868 | nlh = nlmsg_hdr(skb); |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 1869 | err = 0; |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1870 | |
Martin Murray | ad8e4b7 | 2006-01-10 13:02:29 -0800 | [diff] [blame] | 1871 | if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1872 | return 0; |
| 1873 | |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 1874 | /* Only requests are handled by the kernel */ |
| 1875 | if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1876 | goto ack; |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 1877 | |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 1878 | /* Skip control messages */ |
| 1879 | if (nlh->nlmsg_type < NLMSG_MIN_TYPE) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1880 | goto ack; |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 1881 | |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 1882 | err = cb(skb, nlh); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1883 | if (err == -EINTR) |
| 1884 | goto skip; |
| 1885 | |
| 1886 | ack: |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 1887 | if (nlh->nlmsg_flags & NLM_F_ACK || err) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1888 | netlink_ack(skb, nlh, err); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1889 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 1890 | skip: |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1891 | msglen = NLMSG_ALIGN(nlh->nlmsg_len); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1892 | if (msglen > skb->len) |
| 1893 | msglen = skb->len; |
| 1894 | skb_pull(skb, msglen); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1895 | } |
| 1896 | |
| 1897 | return 0; |
| 1898 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1899 | EXPORT_SYMBOL(netlink_rcv_skb); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 1900 | |
| 1901 | /** |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1902 | * nlmsg_notify - send a notification netlink message |
| 1903 | * @sk: netlink socket to use |
| 1904 | * @skb: notification message |
| 1905 | * @pid: destination netlink pid for reports or 0 |
| 1906 | * @group: destination multicast group or 0 |
| 1907 | * @report: 1 to report back, 0 to disable |
| 1908 | * @flags: allocation flags |
| 1909 | */ |
| 1910 | int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 pid, |
| 1911 | unsigned int group, int report, gfp_t flags) |
| 1912 | { |
| 1913 | int err = 0; |
| 1914 | |
| 1915 | if (group) { |
| 1916 | int exclude_pid = 0; |
| 1917 | |
| 1918 | if (report) { |
| 1919 | atomic_inc(&skb->users); |
| 1920 | exclude_pid = pid; |
| 1921 | } |
| 1922 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 1923 | /* errors reported via destination sk->sk_err, but propagate |
| 1924 | * delivery errors if NETLINK_BROADCAST_ERROR flag is set */ |
| 1925 | err = nlmsg_multicast(sk, skb, exclude_pid, group, flags); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1926 | } |
| 1927 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 1928 | if (report) { |
| 1929 | int err2; |
| 1930 | |
| 1931 | err2 = nlmsg_unicast(sk, skb, pid); |
| 1932 | if (!err || err == -ESRCH) |
| 1933 | err = err2; |
| 1934 | } |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1935 | |
| 1936 | return err; |
| 1937 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1938 | EXPORT_SYMBOL(nlmsg_notify); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 1939 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1940 | #ifdef CONFIG_PROC_FS |
| 1941 | struct nl_seq_iter { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 1942 | struct seq_net_private p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | int link; |
| 1944 | int hash_idx; |
| 1945 | }; |
| 1946 | |
| 1947 | static struct sock *netlink_seq_socket_idx(struct seq_file *seq, loff_t pos) |
| 1948 | { |
| 1949 | struct nl_seq_iter *iter = seq->private; |
| 1950 | int i, j; |
| 1951 | struct sock *s; |
| 1952 | struct hlist_node *node; |
| 1953 | loff_t off = 0; |
| 1954 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1955 | for (i = 0; i < MAX_LINKS; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1956 | struct nl_pid_hash *hash = &nl_table[i].hash; |
| 1957 | |
| 1958 | for (j = 0; j <= hash->mask; j++) { |
| 1959 | sk_for_each(s, node, &hash->table[j]) { |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 1960 | if (sock_net(s) != seq_file_net(seq)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1961 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1962 | if (off == pos) { |
| 1963 | iter->link = i; |
| 1964 | iter->hash_idx = j; |
| 1965 | return s; |
| 1966 | } |
| 1967 | ++off; |
| 1968 | } |
| 1969 | } |
| 1970 | } |
| 1971 | return NULL; |
| 1972 | } |
| 1973 | |
| 1974 | static void *netlink_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 1975 | __acquires(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | { |
| 1977 | read_lock(&nl_table_lock); |
| 1978 | return *pos ? netlink_seq_socket_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 1979 | } |
| 1980 | |
| 1981 | static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1982 | { |
| 1983 | struct sock *s; |
| 1984 | struct nl_seq_iter *iter; |
| 1985 | int i, j; |
| 1986 | |
| 1987 | ++*pos; |
| 1988 | |
| 1989 | if (v == SEQ_START_TOKEN) |
| 1990 | return netlink_seq_socket_idx(seq, 0); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1991 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1992 | iter = seq->private; |
| 1993 | s = v; |
| 1994 | do { |
| 1995 | s = sk_next(s); |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 1996 | } while (s && sock_net(s) != seq_file_net(seq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | if (s) |
| 1998 | return s; |
| 1999 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | i = iter->link; |
| 2001 | j = iter->hash_idx + 1; |
| 2002 | |
| 2003 | do { |
| 2004 | struct nl_pid_hash *hash = &nl_table[i].hash; |
| 2005 | |
| 2006 | for (; j <= hash->mask; j++) { |
| 2007 | s = sk_head(&hash->table[j]); |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2008 | while (s && sock_net(s) != seq_file_net(seq)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2009 | s = sk_next(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | if (s) { |
| 2011 | iter->link = i; |
| 2012 | iter->hash_idx = j; |
| 2013 | return s; |
| 2014 | } |
| 2015 | } |
| 2016 | |
| 2017 | j = 0; |
| 2018 | } while (++i < MAX_LINKS); |
| 2019 | |
| 2020 | return NULL; |
| 2021 | } |
| 2022 | |
| 2023 | static void netlink_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 2024 | __releases(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2025 | { |
| 2026 | read_unlock(&nl_table_lock); |
| 2027 | } |
| 2028 | |
| 2029 | |
| 2030 | static int netlink_seq_show(struct seq_file *seq, void *v) |
| 2031 | { |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2032 | if (v == SEQ_START_TOKEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | seq_puts(seq, |
| 2034 | "sk Eth Pid Groups " |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 2035 | "Rmem Wmem Dump Locks Drops Inode\n"); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2036 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | struct sock *s = v; |
| 2038 | struct netlink_sock *nlk = nlk_sk(s); |
| 2039 | |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 2040 | seq_printf(seq, "%pK %-3d %-6d %08x %-8d %-8d %pK %-8d %-8d %-8lu\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2041 | s, |
| 2042 | s->sk_protocol, |
| 2043 | nlk->pid, |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 2044 | nlk->groups ? (u32)nlk->groups[0] : 0, |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 2045 | sk_rmem_alloc_get(s), |
| 2046 | sk_wmem_alloc_get(s), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | nlk->cb, |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2048 | atomic_read(&s->sk_refcnt), |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 2049 | atomic_read(&s->sk_drops), |
| 2050 | sock_i_ino(s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2051 | ); |
| 2052 | |
| 2053 | } |
| 2054 | return 0; |
| 2055 | } |
| 2056 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 2057 | static const struct seq_operations netlink_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | .start = netlink_seq_start, |
| 2059 | .next = netlink_seq_next, |
| 2060 | .stop = netlink_seq_stop, |
| 2061 | .show = netlink_seq_show, |
| 2062 | }; |
| 2063 | |
| 2064 | |
| 2065 | static int netlink_seq_open(struct inode *inode, struct file *file) |
| 2066 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2067 | return seq_open_net(inode, file, &netlink_seq_ops, |
| 2068 | sizeof(struct nl_seq_iter)); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2069 | } |
| 2070 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 2071 | static const struct file_operations netlink_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | .owner = THIS_MODULE, |
| 2073 | .open = netlink_seq_open, |
| 2074 | .read = seq_read, |
| 2075 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2076 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2077 | }; |
| 2078 | |
| 2079 | #endif |
| 2080 | |
| 2081 | int netlink_register_notifier(struct notifier_block *nb) |
| 2082 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2083 | return atomic_notifier_chain_register(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2085 | EXPORT_SYMBOL(netlink_register_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | |
| 2087 | int netlink_unregister_notifier(struct notifier_block *nb) |
| 2088 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2089 | return atomic_notifier_chain_unregister(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2091 | EXPORT_SYMBOL(netlink_unregister_notifier); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2092 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 2093 | static const struct proto_ops netlink_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2094 | .family = PF_NETLINK, |
| 2095 | .owner = THIS_MODULE, |
| 2096 | .release = netlink_release, |
| 2097 | .bind = netlink_bind, |
| 2098 | .connect = netlink_connect, |
| 2099 | .socketpair = sock_no_socketpair, |
| 2100 | .accept = sock_no_accept, |
| 2101 | .getname = netlink_getname, |
| 2102 | .poll = datagram_poll, |
| 2103 | .ioctl = sock_no_ioctl, |
| 2104 | .listen = sock_no_listen, |
| 2105 | .shutdown = sock_no_shutdown, |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2106 | .setsockopt = netlink_setsockopt, |
| 2107 | .getsockopt = netlink_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2108 | .sendmsg = netlink_sendmsg, |
| 2109 | .recvmsg = netlink_recvmsg, |
| 2110 | .mmap = sock_no_mmap, |
| 2111 | .sendpage = sock_no_sendpage, |
| 2112 | }; |
| 2113 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 2114 | static const struct net_proto_family netlink_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | .family = PF_NETLINK, |
| 2116 | .create = netlink_create, |
| 2117 | .owner = THIS_MODULE, /* for consistency 8) */ |
| 2118 | }; |
| 2119 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 2120 | static int __net_init netlink_net_init(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2121 | { |
| 2122 | #ifdef CONFIG_PROC_FS |
| 2123 | if (!proc_net_fops_create(net, "netlink", 0, &netlink_seq_fops)) |
| 2124 | return -ENOMEM; |
| 2125 | #endif |
| 2126 | return 0; |
| 2127 | } |
| 2128 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 2129 | static void __net_exit netlink_net_exit(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2130 | { |
| 2131 | #ifdef CONFIG_PROC_FS |
| 2132 | proc_net_remove(net, "netlink"); |
| 2133 | #endif |
| 2134 | } |
| 2135 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2136 | static void __init netlink_add_usersock_entry(void) |
| 2137 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2138 | struct listeners *listeners; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2139 | int groups = 32; |
| 2140 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2141 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2142 | if (!listeners) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2143 | panic("netlink_add_usersock_entry: Cannot allocate listeners\n"); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2144 | |
| 2145 | netlink_table_grab(); |
| 2146 | |
| 2147 | nl_table[NETLINK_USERSOCK].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2148 | rcu_assign_pointer(nl_table[NETLINK_USERSOCK].listeners, listeners); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2149 | nl_table[NETLINK_USERSOCK].module = THIS_MODULE; |
| 2150 | nl_table[NETLINK_USERSOCK].registered = 1; |
Pablo Neira Ayuso | 20e1db1 | 2012-08-23 02:09:11 +0000 | [diff] [blame] | 2151 | nl_table[NETLINK_USERSOCK].nl_nonroot = NL_NONROOT_SEND; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2152 | |
| 2153 | netlink_table_ungrab(); |
| 2154 | } |
| 2155 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 2156 | static struct pernet_operations __net_initdata netlink_net_ops = { |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2157 | .init = netlink_net_init, |
| 2158 | .exit = netlink_net_exit, |
| 2159 | }; |
| 2160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2161 | static int __init netlink_proto_init(void) |
| 2162 | { |
| 2163 | struct sk_buff *dummy_skb; |
| 2164 | int i; |
Denis Cheng | 26ff5dd | 2007-09-16 16:36:02 -0700 | [diff] [blame] | 2165 | unsigned long limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2166 | unsigned int order; |
| 2167 | int err = proto_register(&netlink_proto, 0); |
| 2168 | |
| 2169 | if (err != 0) |
| 2170 | goto out; |
| 2171 | |
YOSHIFUJI Hideaki | ef047f5 | 2006-09-01 00:29:06 -0700 | [diff] [blame] | 2172 | BUILD_BUG_ON(sizeof(struct netlink_skb_parms) > sizeof(dummy_skb->cb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2173 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 2174 | nl_table = kcalloc(MAX_LINKS, sizeof(*nl_table), GFP_KERNEL); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2175 | if (!nl_table) |
| 2176 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2177 | |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 2178 | if (totalram_pages >= (128 * 1024)) |
| 2179 | limit = totalram_pages >> (21 - PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2180 | else |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 2181 | limit = totalram_pages >> (23 - PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | |
Denis Cheng | 26ff5dd | 2007-09-16 16:36:02 -0700 | [diff] [blame] | 2183 | order = get_bitmask_order(limit) - 1 + PAGE_SHIFT; |
| 2184 | limit = (1UL << order) / sizeof(struct hlist_head); |
| 2185 | order = get_bitmask_order(min(limit, (unsigned long)UINT_MAX)) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2186 | |
| 2187 | for (i = 0; i < MAX_LINKS; i++) { |
| 2188 | struct nl_pid_hash *hash = &nl_table[i].hash; |
| 2189 | |
Eric Dumazet | ea72912 | 2007-12-11 02:09:47 -0800 | [diff] [blame] | 2190 | hash->table = nl_pid_hash_zalloc(1 * sizeof(*hash->table)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | if (!hash->table) { |
| 2192 | while (i-- > 0) |
| 2193 | nl_pid_hash_free(nl_table[i].hash.table, |
| 2194 | 1 * sizeof(*hash->table)); |
| 2195 | kfree(nl_table); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2196 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2197 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | hash->max_shift = order; |
| 2199 | hash->shift = 0; |
| 2200 | hash->mask = 0; |
| 2201 | hash->rehash_time = jiffies; |
| 2202 | } |
| 2203 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2204 | netlink_add_usersock_entry(); |
| 2205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2206 | sock_register(&netlink_family_ops); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2207 | register_pernet_subsys(&netlink_net_ops); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2208 | /* The netlink device handler may be needed early. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2209 | rtnetlink_init(); |
| 2210 | out: |
| 2211 | return err; |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2212 | panic: |
| 2213 | panic("netlink_init: Cannot allocate nl_table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2214 | } |
| 2215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | core_initcall(netlink_proto_init); |