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> |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame^] | 58 | #include <linux/vmalloc.h> |
Andrew Morton | 54e0f52 | 2005-04-30 07:07:04 +0100 | [diff] [blame] | 59 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 60 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | #include <net/sock.h> |
| 62 | #include <net/scm.h> |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 63 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 65 | #include "af_netlink.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 67 | struct listeners { |
| 68 | struct rcu_head rcu; |
| 69 | unsigned long masks[0]; |
Johannes Berg | 6c04bb1 | 2009-07-10 09:51:32 +0000 | [diff] [blame] | 70 | }; |
| 71 | |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 72 | /* state bits */ |
| 73 | #define NETLINK_CONGESTED 0x0 |
| 74 | |
| 75 | /* flags */ |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 76 | #define NETLINK_KERNEL_SOCKET 0x1 |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 77 | #define NETLINK_RECV_PKTINFO 0x2 |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 78 | #define NETLINK_BROADCAST_SEND_ERROR 0x4 |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 79 | #define NETLINK_RECV_NO_ENOBUFS 0x8 |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 80 | |
David S. Miller | 035c4c1 | 2011-12-23 17:33:03 -0500 | [diff] [blame] | 81 | static inline int netlink_is_kernel(struct sock *sk) |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 82 | { |
| 83 | return nlk_sk(sk)->flags & NETLINK_KERNEL_SOCKET; |
| 84 | } |
| 85 | |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 86 | struct netlink_table *nl_table; |
| 87 | EXPORT_SYMBOL_GPL(nl_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
| 89 | static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait); |
| 90 | |
| 91 | static int netlink_dump(struct sock *sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 93 | DEFINE_RWLOCK(nl_table_lock); |
| 94 | EXPORT_SYMBOL_GPL(nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | static atomic_t nl_table_users = ATOMIC_INIT(0); |
| 96 | |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 97 | #define nl_deref_protected(X) rcu_dereference_protected(X, lockdep_is_held(&nl_table_lock)); |
| 98 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 99 | static ATOMIC_NOTIFIER_HEAD(netlink_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 101 | static inline u32 netlink_group_mask(u32 group) |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 102 | { |
| 103 | return group ? 1 << (group - 1) : 0; |
| 104 | } |
| 105 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 106 | static inline struct hlist_head *nl_portid_hashfn(struct nl_portid_hash *hash, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 108 | return &hash->table[jhash_1word(portid, hash->rnd) & hash->mask]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | } |
| 110 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame^] | 111 | #ifdef CONFIG_NETLINK_MMAP |
| 112 | static __pure struct page *pgvec_to_page(const void *addr) |
| 113 | { |
| 114 | if (is_vmalloc_addr(addr)) |
| 115 | return vmalloc_to_page(addr); |
| 116 | else |
| 117 | return virt_to_page(addr); |
| 118 | } |
| 119 | |
| 120 | static void free_pg_vec(void **pg_vec, unsigned int order, unsigned int len) |
| 121 | { |
| 122 | unsigned int i; |
| 123 | |
| 124 | for (i = 0; i < len; i++) { |
| 125 | if (pg_vec[i] != NULL) { |
| 126 | if (is_vmalloc_addr(pg_vec[i])) |
| 127 | vfree(pg_vec[i]); |
| 128 | else |
| 129 | free_pages((unsigned long)pg_vec[i], order); |
| 130 | } |
| 131 | } |
| 132 | kfree(pg_vec); |
| 133 | } |
| 134 | |
| 135 | static void *alloc_one_pg_vec_page(unsigned long order) |
| 136 | { |
| 137 | void *buffer; |
| 138 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | |
| 139 | __GFP_NOWARN | __GFP_NORETRY; |
| 140 | |
| 141 | buffer = (void *)__get_free_pages(gfp_flags, order); |
| 142 | if (buffer != NULL) |
| 143 | return buffer; |
| 144 | |
| 145 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
| 146 | if (buffer != NULL) |
| 147 | return buffer; |
| 148 | |
| 149 | gfp_flags &= ~__GFP_NORETRY; |
| 150 | return (void *)__get_free_pages(gfp_flags, order); |
| 151 | } |
| 152 | |
| 153 | static void **alloc_pg_vec(struct netlink_sock *nlk, |
| 154 | struct nl_mmap_req *req, unsigned int order) |
| 155 | { |
| 156 | unsigned int block_nr = req->nm_block_nr; |
| 157 | unsigned int i; |
| 158 | void **pg_vec, *ptr; |
| 159 | |
| 160 | pg_vec = kcalloc(block_nr, sizeof(void *), GFP_KERNEL); |
| 161 | if (pg_vec == NULL) |
| 162 | return NULL; |
| 163 | |
| 164 | for (i = 0; i < block_nr; i++) { |
| 165 | pg_vec[i] = ptr = alloc_one_pg_vec_page(order); |
| 166 | if (pg_vec[i] == NULL) |
| 167 | goto err1; |
| 168 | } |
| 169 | |
| 170 | return pg_vec; |
| 171 | err1: |
| 172 | free_pg_vec(pg_vec, order, block_nr); |
| 173 | return NULL; |
| 174 | } |
| 175 | |
| 176 | static int netlink_set_ring(struct sock *sk, struct nl_mmap_req *req, |
| 177 | bool closing, bool tx_ring) |
| 178 | { |
| 179 | struct netlink_sock *nlk = nlk_sk(sk); |
| 180 | struct netlink_ring *ring; |
| 181 | struct sk_buff_head *queue; |
| 182 | void **pg_vec = NULL; |
| 183 | unsigned int order = 0; |
| 184 | int err; |
| 185 | |
| 186 | ring = tx_ring ? &nlk->tx_ring : &nlk->rx_ring; |
| 187 | queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; |
| 188 | |
| 189 | if (!closing) { |
| 190 | if (atomic_read(&nlk->mapped)) |
| 191 | return -EBUSY; |
| 192 | if (atomic_read(&ring->pending)) |
| 193 | return -EBUSY; |
| 194 | } |
| 195 | |
| 196 | if (req->nm_block_nr) { |
| 197 | if (ring->pg_vec != NULL) |
| 198 | return -EBUSY; |
| 199 | |
| 200 | if ((int)req->nm_block_size <= 0) |
| 201 | return -EINVAL; |
| 202 | if (!IS_ALIGNED(req->nm_block_size, PAGE_SIZE)) |
| 203 | return -EINVAL; |
| 204 | if (req->nm_frame_size < NL_MMAP_HDRLEN) |
| 205 | return -EINVAL; |
| 206 | if (!IS_ALIGNED(req->nm_frame_size, NL_MMAP_MSG_ALIGNMENT)) |
| 207 | return -EINVAL; |
| 208 | |
| 209 | ring->frames_per_block = req->nm_block_size / |
| 210 | req->nm_frame_size; |
| 211 | if (ring->frames_per_block == 0) |
| 212 | return -EINVAL; |
| 213 | if (ring->frames_per_block * req->nm_block_nr != |
| 214 | req->nm_frame_nr) |
| 215 | return -EINVAL; |
| 216 | |
| 217 | order = get_order(req->nm_block_size); |
| 218 | pg_vec = alloc_pg_vec(nlk, req, order); |
| 219 | if (pg_vec == NULL) |
| 220 | return -ENOMEM; |
| 221 | } else { |
| 222 | if (req->nm_frame_nr) |
| 223 | return -EINVAL; |
| 224 | } |
| 225 | |
| 226 | err = -EBUSY; |
| 227 | mutex_lock(&nlk->pg_vec_lock); |
| 228 | if (closing || atomic_read(&nlk->mapped) == 0) { |
| 229 | err = 0; |
| 230 | spin_lock_bh(&queue->lock); |
| 231 | |
| 232 | ring->frame_max = req->nm_frame_nr - 1; |
| 233 | ring->head = 0; |
| 234 | ring->frame_size = req->nm_frame_size; |
| 235 | ring->pg_vec_pages = req->nm_block_size / PAGE_SIZE; |
| 236 | |
| 237 | swap(ring->pg_vec_len, req->nm_block_nr); |
| 238 | swap(ring->pg_vec_order, order); |
| 239 | swap(ring->pg_vec, pg_vec); |
| 240 | |
| 241 | __skb_queue_purge(queue); |
| 242 | spin_unlock_bh(&queue->lock); |
| 243 | |
| 244 | WARN_ON(atomic_read(&nlk->mapped)); |
| 245 | } |
| 246 | mutex_unlock(&nlk->pg_vec_lock); |
| 247 | |
| 248 | if (pg_vec) |
| 249 | free_pg_vec(pg_vec, order, req->nm_block_nr); |
| 250 | return err; |
| 251 | } |
| 252 | |
| 253 | static void netlink_mm_open(struct vm_area_struct *vma) |
| 254 | { |
| 255 | struct file *file = vma->vm_file; |
| 256 | struct socket *sock = file->private_data; |
| 257 | struct sock *sk = sock->sk; |
| 258 | |
| 259 | if (sk) |
| 260 | atomic_inc(&nlk_sk(sk)->mapped); |
| 261 | } |
| 262 | |
| 263 | static void netlink_mm_close(struct vm_area_struct *vma) |
| 264 | { |
| 265 | struct file *file = vma->vm_file; |
| 266 | struct socket *sock = file->private_data; |
| 267 | struct sock *sk = sock->sk; |
| 268 | |
| 269 | if (sk) |
| 270 | atomic_dec(&nlk_sk(sk)->mapped); |
| 271 | } |
| 272 | |
| 273 | static const struct vm_operations_struct netlink_mmap_ops = { |
| 274 | .open = netlink_mm_open, |
| 275 | .close = netlink_mm_close, |
| 276 | }; |
| 277 | |
| 278 | static int netlink_mmap(struct file *file, struct socket *sock, |
| 279 | struct vm_area_struct *vma) |
| 280 | { |
| 281 | struct sock *sk = sock->sk; |
| 282 | struct netlink_sock *nlk = nlk_sk(sk); |
| 283 | struct netlink_ring *ring; |
| 284 | unsigned long start, size, expected; |
| 285 | unsigned int i; |
| 286 | int err = -EINVAL; |
| 287 | |
| 288 | if (vma->vm_pgoff) |
| 289 | return -EINVAL; |
| 290 | |
| 291 | mutex_lock(&nlk->pg_vec_lock); |
| 292 | |
| 293 | expected = 0; |
| 294 | for (ring = &nlk->rx_ring; ring <= &nlk->tx_ring; ring++) { |
| 295 | if (ring->pg_vec == NULL) |
| 296 | continue; |
| 297 | expected += ring->pg_vec_len * ring->pg_vec_pages * PAGE_SIZE; |
| 298 | } |
| 299 | |
| 300 | if (expected == 0) |
| 301 | goto out; |
| 302 | |
| 303 | size = vma->vm_end - vma->vm_start; |
| 304 | if (size != expected) |
| 305 | goto out; |
| 306 | |
| 307 | start = vma->vm_start; |
| 308 | for (ring = &nlk->rx_ring; ring <= &nlk->tx_ring; ring++) { |
| 309 | if (ring->pg_vec == NULL) |
| 310 | continue; |
| 311 | |
| 312 | for (i = 0; i < ring->pg_vec_len; i++) { |
| 313 | struct page *page; |
| 314 | void *kaddr = ring->pg_vec[i]; |
| 315 | unsigned int pg_num; |
| 316 | |
| 317 | for (pg_num = 0; pg_num < ring->pg_vec_pages; pg_num++) { |
| 318 | page = pgvec_to_page(kaddr); |
| 319 | err = vm_insert_page(vma, start, page); |
| 320 | if (err < 0) |
| 321 | goto out; |
| 322 | start += PAGE_SIZE; |
| 323 | kaddr += PAGE_SIZE; |
| 324 | } |
| 325 | } |
| 326 | } |
| 327 | |
| 328 | atomic_inc(&nlk->mapped); |
| 329 | vma->vm_ops = &netlink_mmap_ops; |
| 330 | err = 0; |
| 331 | out: |
| 332 | mutex_unlock(&nlk->pg_vec_lock); |
| 333 | return 0; |
| 334 | } |
| 335 | #else /* CONFIG_NETLINK_MMAP */ |
| 336 | #define netlink_mmap sock_no_mmap |
| 337 | #endif /* CONFIG_NETLINK_MMAP */ |
| 338 | |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 339 | static void netlink_destroy_callback(struct netlink_callback *cb) |
| 340 | { |
| 341 | kfree_skb(cb->skb); |
| 342 | kfree(cb); |
| 343 | } |
| 344 | |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 345 | static void netlink_consume_callback(struct netlink_callback *cb) |
| 346 | { |
| 347 | consume_skb(cb->skb); |
| 348 | kfree(cb); |
| 349 | } |
| 350 | |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 351 | static void netlink_skb_destructor(struct sk_buff *skb) |
| 352 | { |
| 353 | sock_rfree(skb); |
| 354 | } |
| 355 | |
| 356 | static void netlink_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
| 357 | { |
| 358 | WARN_ON(skb->sk != NULL); |
| 359 | skb->sk = sk; |
| 360 | skb->destructor = netlink_skb_destructor; |
| 361 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); |
| 362 | sk_mem_charge(sk, skb->truesize); |
| 363 | } |
| 364 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | static void netlink_sock_destruct(struct sock *sk) |
| 366 | { |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 367 | struct netlink_sock *nlk = nlk_sk(sk); |
| 368 | |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 369 | if (nlk->cb) { |
| 370 | if (nlk->cb->done) |
| 371 | nlk->cb->done(nlk->cb); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 372 | |
| 373 | module_put(nlk->cb->module); |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 374 | netlink_destroy_callback(nlk->cb); |
| 375 | } |
| 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | skb_queue_purge(&sk->sk_receive_queue); |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame^] | 378 | #ifdef CONFIG_NETLINK_MMAP |
| 379 | if (1) { |
| 380 | struct nl_mmap_req req; |
| 381 | |
| 382 | memset(&req, 0, sizeof(req)); |
| 383 | if (nlk->rx_ring.pg_vec) |
| 384 | netlink_set_ring(sk, &req, true, false); |
| 385 | memset(&req, 0, sizeof(req)); |
| 386 | if (nlk->tx_ring.pg_vec) |
| 387 | netlink_set_ring(sk, &req, true, true); |
| 388 | } |
| 389 | #endif /* CONFIG_NETLINK_MMAP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
| 391 | if (!sock_flag(sk, SOCK_DEAD)) { |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 392 | printk(KERN_ERR "Freeing alive netlink socket %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | return; |
| 394 | } |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 395 | |
| 396 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| 397 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
| 398 | WARN_ON(nlk_sk(sk)->groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | } |
| 400 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 401 | /* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on |
| 402 | * 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] | 403 | * immediately hit write lock and grab all the cpus. Exclusive sleep solves |
| 404 | * this, _but_ remember, it adds useless work on UP machines. |
| 405 | */ |
| 406 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 407 | void netlink_table_grab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 408 | __acquires(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 409 | { |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 410 | might_sleep(); |
| 411 | |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 412 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | |
| 414 | if (atomic_read(&nl_table_users)) { |
| 415 | DECLARE_WAITQUEUE(wait, current); |
| 416 | |
| 417 | add_wait_queue_exclusive(&nl_table_wait, &wait); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 418 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 420 | if (atomic_read(&nl_table_users) == 0) |
| 421 | break; |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 422 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | schedule(); |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 424 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | } |
| 426 | |
| 427 | __set_current_state(TASK_RUNNING); |
| 428 | remove_wait_queue(&nl_table_wait, &wait); |
| 429 | } |
| 430 | } |
| 431 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 432 | void netlink_table_ungrab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 433 | __releases(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | { |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 435 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | wake_up(&nl_table_wait); |
| 437 | } |
| 438 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 439 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | netlink_lock_table(void) |
| 441 | { |
| 442 | /* read_lock() synchronizes us to netlink_table_grab */ |
| 443 | |
| 444 | read_lock(&nl_table_lock); |
| 445 | atomic_inc(&nl_table_users); |
| 446 | read_unlock(&nl_table_lock); |
| 447 | } |
| 448 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 449 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | netlink_unlock_table(void) |
| 451 | { |
| 452 | if (atomic_dec_and_test(&nl_table_users)) |
| 453 | wake_up(&nl_table_wait); |
| 454 | } |
| 455 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 456 | static struct sock *netlink_lookup(struct net *net, int protocol, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 458 | struct nl_portid_hash *hash = &nl_table[protocol].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | struct hlist_head *head; |
| 460 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 461 | |
| 462 | read_lock(&nl_table_lock); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 463 | head = nl_portid_hashfn(hash, portid); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 464 | sk_for_each(sk, head) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 465 | if (net_eq(sock_net(sk), net) && (nlk_sk(sk)->portid == portid)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 466 | sock_hold(sk); |
| 467 | goto found; |
| 468 | } |
| 469 | } |
| 470 | sk = NULL; |
| 471 | found: |
| 472 | read_unlock(&nl_table_lock); |
| 473 | return sk; |
| 474 | } |
| 475 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 476 | static struct hlist_head *nl_portid_hash_zalloc(size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | { |
| 478 | if (size <= PAGE_SIZE) |
Eric Dumazet | ea72912 | 2007-12-11 02:09:47 -0800 | [diff] [blame] | 479 | return kzalloc(size, GFP_ATOMIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | else |
| 481 | return (struct hlist_head *) |
Eric Dumazet | ea72912 | 2007-12-11 02:09:47 -0800 | [diff] [blame] | 482 | __get_free_pages(GFP_ATOMIC | __GFP_ZERO, |
| 483 | get_order(size)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | } |
| 485 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 486 | static void nl_portid_hash_free(struct hlist_head *table, size_t size) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | { |
| 488 | if (size <= PAGE_SIZE) |
| 489 | kfree(table); |
| 490 | else |
| 491 | free_pages((unsigned long)table, get_order(size)); |
| 492 | } |
| 493 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 494 | static int nl_portid_hash_rehash(struct nl_portid_hash *hash, int grow) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | { |
| 496 | unsigned int omask, mask, shift; |
| 497 | size_t osize, size; |
| 498 | struct hlist_head *otable, *table; |
| 499 | int i; |
| 500 | |
| 501 | omask = mask = hash->mask; |
| 502 | osize = size = (mask + 1) * sizeof(*table); |
| 503 | shift = hash->shift; |
| 504 | |
| 505 | if (grow) { |
| 506 | if (++shift > hash->max_shift) |
| 507 | return 0; |
| 508 | mask = mask * 2 + 1; |
| 509 | size *= 2; |
| 510 | } |
| 511 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 512 | table = nl_portid_hash_zalloc(size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | if (!table) |
| 514 | return 0; |
| 515 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | otable = hash->table; |
| 517 | hash->table = table; |
| 518 | hash->mask = mask; |
| 519 | hash->shift = shift; |
| 520 | get_random_bytes(&hash->rnd, sizeof(hash->rnd)); |
| 521 | |
| 522 | for (i = 0; i <= omask; i++) { |
| 523 | struct sock *sk; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 524 | struct hlist_node *tmp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 526 | sk_for_each_safe(sk, tmp, &otable[i]) |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 527 | __sk_add_node(sk, nl_portid_hashfn(hash, nlk_sk(sk)->portid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |
| 529 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 530 | nl_portid_hash_free(otable, osize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | hash->rehash_time = jiffies + 10 * 60 * HZ; |
| 532 | return 1; |
| 533 | } |
| 534 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 535 | static inline int nl_portid_hash_dilute(struct nl_portid_hash *hash, int len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | { |
| 537 | int avg = hash->entries >> hash->shift; |
| 538 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 539 | if (unlikely(avg > 1) && nl_portid_hash_rehash(hash, 1)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | return 1; |
| 541 | |
| 542 | if (unlikely(len > avg) && time_after(jiffies, hash->rehash_time)) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 543 | nl_portid_hash_rehash(hash, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | return 1; |
| 545 | } |
| 546 | |
| 547 | return 0; |
| 548 | } |
| 549 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 550 | static const struct proto_ops netlink_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 552 | static void |
| 553 | netlink_update_listeners(struct sock *sk) |
| 554 | { |
| 555 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 556 | unsigned long mask; |
| 557 | unsigned int i; |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 558 | struct listeners *listeners; |
| 559 | |
| 560 | listeners = nl_deref_protected(tbl->listeners); |
| 561 | if (!listeners) |
| 562 | return; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 563 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 564 | for (i = 0; i < NLGRPLONGS(tbl->groups); i++) { |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 565 | mask = 0; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 566 | sk_for_each_bound(sk, &tbl->mc_list) { |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 567 | if (i < NLGRPLONGS(nlk_sk(sk)->ngroups)) |
| 568 | mask |= nlk_sk(sk)->groups[i]; |
| 569 | } |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 570 | listeners->masks[i] = mask; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 571 | } |
| 572 | /* this function is only called with the netlink table "grabbed", which |
| 573 | * makes sure updates are visible before bind or setsockopt return. */ |
| 574 | } |
| 575 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 576 | static int netlink_insert(struct sock *sk, struct net *net, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 578 | struct nl_portid_hash *hash = &nl_table[sk->sk_protocol].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | struct hlist_head *head; |
| 580 | int err = -EADDRINUSE; |
| 581 | struct sock *osk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | int len; |
| 583 | |
| 584 | netlink_table_grab(); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 585 | head = nl_portid_hashfn(hash, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | len = 0; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 587 | sk_for_each(osk, head) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 588 | if (net_eq(sock_net(osk), net) && (nlk_sk(osk)->portid == portid)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | break; |
| 590 | len++; |
| 591 | } |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 592 | if (osk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | goto err; |
| 594 | |
| 595 | err = -EBUSY; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 596 | if (nlk_sk(sk)->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | goto err; |
| 598 | |
| 599 | err = -ENOMEM; |
| 600 | if (BITS_PER_LONG > 32 && unlikely(hash->entries >= UINT_MAX)) |
| 601 | goto err; |
| 602 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 603 | if (len && nl_portid_hash_dilute(hash, len)) |
| 604 | head = nl_portid_hashfn(hash, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | hash->entries++; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 606 | nlk_sk(sk)->portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | sk_add_node(sk, head); |
| 608 | err = 0; |
| 609 | |
| 610 | err: |
| 611 | netlink_table_ungrab(); |
| 612 | return err; |
| 613 | } |
| 614 | |
| 615 | static void netlink_remove(struct sock *sk) |
| 616 | { |
| 617 | netlink_table_grab(); |
David S. Miller | d470e3b | 2005-06-26 15:31:51 -0700 | [diff] [blame] | 618 | if (sk_del_node_init(sk)) |
| 619 | nl_table[sk->sk_protocol].hash.entries--; |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 620 | if (nlk_sk(sk)->subscriptions) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | __sk_del_bind_node(sk); |
| 622 | netlink_table_ungrab(); |
| 623 | } |
| 624 | |
| 625 | static struct proto netlink_proto = { |
| 626 | .name = "NETLINK", |
| 627 | .owner = THIS_MODULE, |
| 628 | .obj_size = sizeof(struct netlink_sock), |
| 629 | }; |
| 630 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 631 | static int __netlink_create(struct net *net, struct socket *sock, |
| 632 | struct mutex *cb_mutex, int protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | { |
| 634 | struct sock *sk; |
| 635 | struct netlink_sock *nlk; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 636 | |
| 637 | sock->ops = &netlink_ops; |
| 638 | |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 639 | sk = sk_alloc(net, PF_NETLINK, GFP_KERNEL, &netlink_proto); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 640 | if (!sk) |
| 641 | return -ENOMEM; |
| 642 | |
| 643 | sock_init_data(sock, sk); |
| 644 | |
| 645 | nlk = nlk_sk(sk); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 646 | if (cb_mutex) { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 647 | nlk->cb_mutex = cb_mutex; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 648 | } else { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 649 | nlk->cb_mutex = &nlk->cb_def_mutex; |
| 650 | mutex_init(nlk->cb_mutex); |
| 651 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 652 | init_waitqueue_head(&nlk->wait); |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame^] | 653 | #ifdef CONFIG_NETLINK_MMAP |
| 654 | mutex_init(&nlk->pg_vec_lock); |
| 655 | #endif |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 656 | |
| 657 | sk->sk_destruct = netlink_sock_destruct; |
| 658 | sk->sk_protocol = protocol; |
| 659 | return 0; |
| 660 | } |
| 661 | |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 662 | static int netlink_create(struct net *net, struct socket *sock, int protocol, |
| 663 | int kern) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 664 | { |
| 665 | struct module *module = NULL; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 666 | struct mutex *cb_mutex; |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 667 | struct netlink_sock *nlk; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 668 | void (*bind)(int group); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 669 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | |
| 671 | sock->state = SS_UNCONNECTED; |
| 672 | |
| 673 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) |
| 674 | return -ESOCKTNOSUPPORT; |
| 675 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 676 | if (protocol < 0 || protocol >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | return -EPROTONOSUPPORT; |
| 678 | |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 679 | netlink_lock_table(); |
Johannes Berg | 95a5afc | 2008-10-16 15:24:51 -0700 | [diff] [blame] | 680 | #ifdef CONFIG_MODULES |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 681 | if (!nl_table[protocol].registered) { |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 682 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 683 | request_module("net-pf-%d-proto-%d", PF_NETLINK, protocol); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 684 | netlink_lock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 685 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 686 | #endif |
| 687 | if (nl_table[protocol].registered && |
| 688 | try_module_get(nl_table[protocol].module)) |
| 689 | module = nl_table[protocol].module; |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 690 | else |
| 691 | err = -EPROTONOSUPPORT; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 692 | cb_mutex = nl_table[protocol].cb_mutex; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 693 | bind = nl_table[protocol].bind; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 694 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 695 | |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 696 | if (err < 0) |
| 697 | goto out; |
| 698 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 699 | err = __netlink_create(net, sock, cb_mutex, protocol); |
| 700 | if (err < 0) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 701 | goto out_module; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 703 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 704 | sock_prot_inuse_add(net, &netlink_proto, 1); |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 705 | local_bh_enable(); |
| 706 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 707 | nlk = nlk_sk(sock->sk); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 708 | nlk->module = module; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 709 | nlk->netlink_bind = bind; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 710 | out: |
| 711 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 713 | out_module: |
| 714 | module_put(module); |
| 715 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | } |
| 717 | |
| 718 | static int netlink_release(struct socket *sock) |
| 719 | { |
| 720 | struct sock *sk = sock->sk; |
| 721 | struct netlink_sock *nlk; |
| 722 | |
| 723 | if (!sk) |
| 724 | return 0; |
| 725 | |
| 726 | netlink_remove(sk); |
Denis Lunev | ac57b3a | 2007-04-18 17:05:58 -0700 | [diff] [blame] | 727 | sock_orphan(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | nlk = nlk_sk(sk); |
| 729 | |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 730 | /* |
| 731 | * OK. Socket is unlinked, any packets that arrive now |
| 732 | * will be purged. |
| 733 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | sock->sk = NULL; |
| 736 | wake_up_interruptible_all(&nlk->wait); |
| 737 | |
| 738 | skb_queue_purge(&sk->sk_write_queue); |
| 739 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 740 | if (nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | struct netlink_notify n = { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 742 | .net = sock_net(sk), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | .protocol = sk->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 744 | .portid = nlk->portid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | }; |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 746 | atomic_notifier_call_chain(&netlink_chain, |
| 747 | NETLINK_URELEASE, &n); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 748 | } |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 749 | |
Mariusz Kozlowski | 5e7c001 | 2007-01-02 15:24:30 -0800 | [diff] [blame] | 750 | module_put(nlk->module); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 751 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 752 | netlink_table_grab(); |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 753 | if (netlink_is_kernel(sk)) { |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 754 | BUG_ON(nl_table[sk->sk_protocol].registered == 0); |
| 755 | if (--nl_table[sk->sk_protocol].registered == 0) { |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 756 | struct listeners *old; |
| 757 | |
| 758 | old = nl_deref_protected(nl_table[sk->sk_protocol].listeners); |
| 759 | RCU_INIT_POINTER(nl_table[sk->sk_protocol].listeners, NULL); |
| 760 | kfree_rcu(old, rcu); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 761 | nl_table[sk->sk_protocol].module = NULL; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 762 | nl_table[sk->sk_protocol].bind = NULL; |
| 763 | nl_table[sk->sk_protocol].flags = 0; |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 764 | nl_table[sk->sk_protocol].registered = 0; |
| 765 | } |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 766 | } else if (nlk->subscriptions) { |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 767 | netlink_update_listeners(sk); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 768 | } |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 769 | netlink_table_ungrab(); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 770 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 771 | kfree(nlk->groups); |
| 772 | nlk->groups = NULL; |
| 773 | |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 774 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 775 | sock_prot_inuse_add(sock_net(sk), &netlink_proto, -1); |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 776 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | sock_put(sk); |
| 778 | return 0; |
| 779 | } |
| 780 | |
| 781 | static int netlink_autobind(struct socket *sock) |
| 782 | { |
| 783 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 784 | struct net *net = sock_net(sk); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 785 | struct nl_portid_hash *hash = &nl_table[sk->sk_protocol].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | struct hlist_head *head; |
| 787 | struct sock *osk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 788 | s32 portid = task_tgid_vnr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | int err; |
| 790 | static s32 rover = -4097; |
| 791 | |
| 792 | retry: |
| 793 | cond_resched(); |
| 794 | netlink_table_grab(); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 795 | head = nl_portid_hashfn(hash, portid); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 796 | sk_for_each(osk, head) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 797 | if (!net_eq(sock_net(osk), net)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 798 | continue; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 799 | if (nlk_sk(osk)->portid == portid) { |
| 800 | /* Bind collision, search negative portid values. */ |
| 801 | portid = rover--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | if (rover > -4097) |
| 803 | rover = -4097; |
| 804 | netlink_table_ungrab(); |
| 805 | goto retry; |
| 806 | } |
| 807 | } |
| 808 | netlink_table_ungrab(); |
| 809 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 810 | err = netlink_insert(sk, net, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | if (err == -EADDRINUSE) |
| 812 | goto retry; |
David S. Miller | d470e3b | 2005-06-26 15:31:51 -0700 | [diff] [blame] | 813 | |
| 814 | /* If 2 threads race to autobind, that is fine. */ |
| 815 | if (err == -EBUSY) |
| 816 | err = 0; |
| 817 | |
| 818 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | } |
| 820 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 821 | static inline int netlink_capable(const struct socket *sock, unsigned int flag) |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 822 | { |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 823 | return (nl_table[sock->sk->sk_protocol].flags & flag) || |
Eric W. Biederman | df008c9 | 2012-11-16 03:03:07 +0000 | [diff] [blame] | 824 | ns_capable(sock_net(sock->sk)->user_ns, CAP_NET_ADMIN); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 825 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 827 | static void |
| 828 | netlink_update_subscriptions(struct sock *sk, unsigned int subscriptions) |
| 829 | { |
| 830 | struct netlink_sock *nlk = nlk_sk(sk); |
| 831 | |
| 832 | if (nlk->subscriptions && !subscriptions) |
| 833 | __sk_del_bind_node(sk); |
| 834 | else if (!nlk->subscriptions && subscriptions) |
| 835 | sk_add_bind_node(sk, &nl_table[sk->sk_protocol].mc_list); |
| 836 | nlk->subscriptions = subscriptions; |
| 837 | } |
| 838 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 839 | static int netlink_realloc_groups(struct sock *sk) |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 840 | { |
| 841 | struct netlink_sock *nlk = nlk_sk(sk); |
| 842 | unsigned int groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 843 | unsigned long *new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 844 | int err = 0; |
| 845 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 846 | netlink_table_grab(); |
| 847 | |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 848 | groups = nl_table[sk->sk_protocol].groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 849 | if (!nl_table[sk->sk_protocol].registered) { |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 850 | err = -ENOENT; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 851 | goto out_unlock; |
| 852 | } |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 853 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 854 | if (nlk->ngroups >= groups) |
| 855 | goto out_unlock; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 856 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 857 | new_groups = krealloc(nlk->groups, NLGRPSZ(groups), GFP_ATOMIC); |
| 858 | if (new_groups == NULL) { |
| 859 | err = -ENOMEM; |
| 860 | goto out_unlock; |
| 861 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 862 | memset((char *)new_groups + NLGRPSZ(nlk->ngroups), 0, |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 863 | NLGRPSZ(groups) - NLGRPSZ(nlk->ngroups)); |
| 864 | |
| 865 | nlk->groups = new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 866 | nlk->ngroups = groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 867 | out_unlock: |
| 868 | netlink_table_ungrab(); |
| 869 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 870 | } |
| 871 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 872 | static int netlink_bind(struct socket *sock, struct sockaddr *addr, |
| 873 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | { |
| 875 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 876 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | struct netlink_sock *nlk = nlk_sk(sk); |
| 878 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
| 879 | int err; |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 880 | |
Hannes Frederic Sowa | 4e4b537 | 2012-12-15 15:42:19 +0000 | [diff] [blame] | 881 | if (addr_len < sizeof(struct sockaddr_nl)) |
| 882 | return -EINVAL; |
| 883 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | if (nladdr->nl_family != AF_NETLINK) |
| 885 | return -EINVAL; |
| 886 | |
| 887 | /* Only superuser is allowed to listen multicasts */ |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 888 | if (nladdr->nl_groups) { |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 889 | if (!netlink_capable(sock, NL_CFG_F_NONROOT_RECV)) |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 890 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 891 | err = netlink_realloc_groups(sk); |
| 892 | if (err) |
| 893 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 894 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 896 | if (nlk->portid) { |
| 897 | if (nladdr->nl_pid != nlk->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | return -EINVAL; |
| 899 | } else { |
| 900 | err = nladdr->nl_pid ? |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 901 | netlink_insert(sk, net, nladdr->nl_pid) : |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 902 | netlink_autobind(sock); |
| 903 | if (err) |
| 904 | return err; |
| 905 | } |
| 906 | |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 907 | if (!nladdr->nl_groups && (nlk->groups == NULL || !(u32)nlk->groups[0])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | return 0; |
| 909 | |
| 910 | netlink_table_grab(); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 911 | netlink_update_subscriptions(sk, nlk->subscriptions + |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 912 | hweight32(nladdr->nl_groups) - |
| 913 | hweight32(nlk->groups[0])); |
| 914 | nlk->groups[0] = (nlk->groups[0] & ~0xffffffffUL) | nladdr->nl_groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 915 | netlink_update_listeners(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | netlink_table_ungrab(); |
| 917 | |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 918 | if (nlk->netlink_bind && nlk->groups[0]) { |
| 919 | int i; |
| 920 | |
| 921 | for (i=0; i<nlk->ngroups; i++) { |
| 922 | if (test_bit(i, nlk->groups)) |
| 923 | nlk->netlink_bind(i); |
| 924 | } |
| 925 | } |
| 926 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | return 0; |
| 928 | } |
| 929 | |
| 930 | static int netlink_connect(struct socket *sock, struct sockaddr *addr, |
| 931 | int alen, int flags) |
| 932 | { |
| 933 | int err = 0; |
| 934 | struct sock *sk = sock->sk; |
| 935 | struct netlink_sock *nlk = nlk_sk(sk); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 936 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | |
Changli Gao | 6503d96 | 2010-03-31 22:58:26 +0000 | [diff] [blame] | 938 | if (alen < sizeof(addr->sa_family)) |
| 939 | return -EINVAL; |
| 940 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | if (addr->sa_family == AF_UNSPEC) { |
| 942 | sk->sk_state = NETLINK_UNCONNECTED; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 943 | nlk->dst_portid = 0; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 944 | nlk->dst_group = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | return 0; |
| 946 | } |
| 947 | if (addr->sa_family != AF_NETLINK) |
| 948 | return -EINVAL; |
| 949 | |
| 950 | /* Only superuser is allowed to send multicasts */ |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 951 | if (nladdr->nl_groups && !netlink_capable(sock, NL_CFG_F_NONROOT_SEND)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | return -EPERM; |
| 953 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 954 | if (!nlk->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | err = netlink_autobind(sock); |
| 956 | |
| 957 | if (err == 0) { |
| 958 | sk->sk_state = NETLINK_CONNECTED; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 959 | nlk->dst_portid = nladdr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 960 | nlk->dst_group = ffs(nladdr->nl_groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | } |
| 962 | |
| 963 | return err; |
| 964 | } |
| 965 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 966 | static int netlink_getname(struct socket *sock, struct sockaddr *addr, |
| 967 | int *addr_len, int peer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | { |
| 969 | struct sock *sk = sock->sk; |
| 970 | struct netlink_sock *nlk = nlk_sk(sk); |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 971 | DECLARE_SOCKADDR(struct sockaddr_nl *, nladdr, addr); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 972 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | nladdr->nl_family = AF_NETLINK; |
| 974 | nladdr->nl_pad = 0; |
| 975 | *addr_len = sizeof(*nladdr); |
| 976 | |
| 977 | if (peer) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 978 | nladdr->nl_pid = nlk->dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 979 | nladdr->nl_groups = netlink_group_mask(nlk->dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | } else { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 981 | nladdr->nl_pid = nlk->portid; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 982 | nladdr->nl_groups = nlk->groups ? nlk->groups[0] : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | } |
| 984 | return 0; |
| 985 | } |
| 986 | |
| 987 | static void netlink_overrun(struct sock *sk) |
| 988 | { |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 989 | struct netlink_sock *nlk = nlk_sk(sk); |
| 990 | |
| 991 | if (!(nlk->flags & NETLINK_RECV_NO_ENOBUFS)) { |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 992 | if (!test_and_set_bit(NETLINK_CONGESTED, &nlk_sk(sk)->state)) { |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 993 | sk->sk_err = ENOBUFS; |
| 994 | sk->sk_error_report(sk); |
| 995 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | } |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 997 | atomic_inc(&sk->sk_drops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | } |
| 999 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1000 | static struct sock *netlink_getsockbyportid(struct sock *ssk, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1001 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | struct sock *sock; |
| 1003 | struct netlink_sock *nlk; |
| 1004 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1005 | sock = netlink_lookup(sock_net(ssk), ssk->sk_protocol, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | if (!sock) |
| 1007 | return ERR_PTR(-ECONNREFUSED); |
| 1008 | |
| 1009 | /* Don't bother queuing skb if kernel socket has no input function */ |
| 1010 | nlk = nlk_sk(sock); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1011 | if (sock->sk_state == NETLINK_CONNECTED && |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1012 | nlk->dst_portid != nlk_sk(ssk)->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | sock_put(sock); |
| 1014 | return ERR_PTR(-ECONNREFUSED); |
| 1015 | } |
| 1016 | return sock; |
| 1017 | } |
| 1018 | |
| 1019 | struct sock *netlink_getsockbyfilp(struct file *filp) |
| 1020 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1021 | struct inode *inode = file_inode(filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | struct sock *sock; |
| 1023 | |
| 1024 | if (!S_ISSOCK(inode->i_mode)) |
| 1025 | return ERR_PTR(-ENOTSOCK); |
| 1026 | |
| 1027 | sock = SOCKET_I(inode)->sk; |
| 1028 | if (sock->sk_family != AF_NETLINK) |
| 1029 | return ERR_PTR(-EINVAL); |
| 1030 | |
| 1031 | sock_hold(sock); |
| 1032 | return sock; |
| 1033 | } |
| 1034 | |
| 1035 | /* |
| 1036 | * Attach a skb to a netlink socket. |
| 1037 | * The caller must hold a reference to the destination socket. On error, the |
| 1038 | * reference is dropped. The skb is not send to the destination, just all |
| 1039 | * all error checks are performed and memory in the queue is reserved. |
| 1040 | * Return values: |
| 1041 | * < 0: error. skb freed, reference to sock dropped. |
| 1042 | * 0: continue |
| 1043 | * 1: repeat lookup - reference dropped while waiting for socket memory. |
| 1044 | */ |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 1045 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1046 | long *timeo, struct sock *ssk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | { |
| 1048 | struct netlink_sock *nlk; |
| 1049 | |
| 1050 | nlk = nlk_sk(sk); |
| 1051 | |
| 1052 | if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1053 | test_bit(NETLINK_CONGESTED, &nlk->state)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | DECLARE_WAITQUEUE(wait, current); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1055 | if (!*timeo) { |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 1056 | if (!ssk || netlink_is_kernel(ssk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | netlink_overrun(sk); |
| 1058 | sock_put(sk); |
| 1059 | kfree_skb(skb); |
| 1060 | return -EAGAIN; |
| 1061 | } |
| 1062 | |
| 1063 | __set_current_state(TASK_INTERRUPTIBLE); |
| 1064 | add_wait_queue(&nlk->wait, &wait); |
| 1065 | |
| 1066 | if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1067 | test_bit(NETLINK_CONGESTED, &nlk->state)) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | !sock_flag(sk, SOCK_DEAD)) |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1069 | *timeo = schedule_timeout(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | |
| 1071 | __set_current_state(TASK_RUNNING); |
| 1072 | remove_wait_queue(&nlk->wait, &wait); |
| 1073 | sock_put(sk); |
| 1074 | |
| 1075 | if (signal_pending(current)) { |
| 1076 | kfree_skb(skb); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1077 | return sock_intr_errno(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1078 | } |
| 1079 | return 1; |
| 1080 | } |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1081 | netlink_skb_set_owner_r(skb, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | return 0; |
| 1083 | } |
| 1084 | |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1085 | static int __netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | int len = skb->len; |
| 1088 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | skb_queue_tail(&sk->sk_receive_queue, skb); |
| 1090 | sk->sk_data_ready(sk, len); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1091 | return len; |
| 1092 | } |
| 1093 | |
| 1094 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
| 1095 | { |
| 1096 | int len = __netlink_sendskb(sk, skb); |
| 1097 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | sock_put(sk); |
| 1099 | return len; |
| 1100 | } |
| 1101 | |
| 1102 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb) |
| 1103 | { |
| 1104 | kfree_skb(skb); |
| 1105 | sock_put(sk); |
| 1106 | } |
| 1107 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1108 | 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] | 1109 | { |
| 1110 | int delta; |
| 1111 | |
Patrick McHardy | 1298ca4 | 2013-04-17 06:46:59 +0000 | [diff] [blame] | 1112 | WARN_ON(skb->sk != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1113 | |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 1114 | delta = skb->end - skb->tail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1115 | if (delta * 2 < skb->truesize) |
| 1116 | return skb; |
| 1117 | |
| 1118 | if (skb_shared(skb)) { |
| 1119 | struct sk_buff *nskb = skb_clone(skb, allocation); |
| 1120 | if (!nskb) |
| 1121 | return skb; |
Eric Dumazet | 8460c00 | 2012-04-19 02:24:28 +0000 | [diff] [blame] | 1122 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | skb = nskb; |
| 1124 | } |
| 1125 | |
| 1126 | if (!pskb_expand_head(skb, 0, -delta, allocation)) |
| 1127 | skb->truesize -= delta; |
| 1128 | |
| 1129 | return skb; |
| 1130 | } |
| 1131 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1132 | static void netlink_rcv_wake(struct sock *sk) |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1133 | { |
| 1134 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1135 | |
| 1136 | if (skb_queue_empty(&sk->sk_receive_queue)) |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1137 | clear_bit(NETLINK_CONGESTED, &nlk->state); |
| 1138 | if (!test_bit(NETLINK_CONGESTED, &nlk->state)) |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1139 | wake_up_interruptible(&nlk->wait); |
| 1140 | } |
| 1141 | |
Eric W. Biederman | 3fbc290 | 2012-05-24 17:21:27 -0600 | [diff] [blame] | 1142 | static int netlink_unicast_kernel(struct sock *sk, struct sk_buff *skb, |
| 1143 | struct sock *ssk) |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1144 | { |
| 1145 | int ret; |
| 1146 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1147 | |
| 1148 | ret = -ECONNREFUSED; |
| 1149 | if (nlk->netlink_rcv != NULL) { |
| 1150 | ret = skb->len; |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1151 | netlink_skb_set_owner_r(skb, sk); |
Patrick McHardy | e32123e | 2013-04-17 06:46:57 +0000 | [diff] [blame] | 1152 | NETLINK_CB(skb).sk = ssk; |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1153 | nlk->netlink_rcv(skb); |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 1154 | consume_skb(skb); |
| 1155 | } else { |
| 1156 | kfree_skb(skb); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1157 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1158 | sock_put(sk); |
| 1159 | return ret; |
| 1160 | } |
| 1161 | |
| 1162 | int netlink_unicast(struct sock *ssk, struct sk_buff *skb, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1163 | u32 portid, int nonblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | { |
| 1165 | struct sock *sk; |
| 1166 | int err; |
| 1167 | long timeo; |
| 1168 | |
| 1169 | skb = netlink_trim(skb, gfp_any()); |
| 1170 | |
| 1171 | timeo = sock_sndtimeo(ssk, nonblock); |
| 1172 | retry: |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1173 | sk = netlink_getsockbyportid(ssk, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | if (IS_ERR(sk)) { |
| 1175 | kfree_skb(skb); |
| 1176 | return PTR_ERR(sk); |
| 1177 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1178 | if (netlink_is_kernel(sk)) |
Eric W. Biederman | 3fbc290 | 2012-05-24 17:21:27 -0600 | [diff] [blame] | 1179 | return netlink_unicast_kernel(sk, skb, ssk); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1180 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1181 | if (sk_filter(sk, skb)) { |
Wang Chen | 8487460 | 2008-07-01 19:55:09 -0700 | [diff] [blame] | 1182 | err = skb->len; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1183 | kfree_skb(skb); |
| 1184 | sock_put(sk); |
| 1185 | return err; |
| 1186 | } |
| 1187 | |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 1188 | err = netlink_attachskb(sk, skb, &timeo, ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | if (err == 1) |
| 1190 | goto retry; |
| 1191 | if (err) |
| 1192 | return err; |
| 1193 | |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 1194 | return netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1196 | EXPORT_SYMBOL(netlink_unicast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1198 | int netlink_has_listeners(struct sock *sk, unsigned int group) |
| 1199 | { |
| 1200 | int res = 0; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1201 | struct listeners *listeners; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1202 | |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 1203 | BUG_ON(!netlink_is_kernel(sk)); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1204 | |
| 1205 | rcu_read_lock(); |
| 1206 | listeners = rcu_dereference(nl_table[sk->sk_protocol].listeners); |
| 1207 | |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1208 | if (listeners && group - 1 < nl_table[sk->sk_protocol].groups) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1209 | res = test_bit(group - 1, listeners->masks); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1210 | |
| 1211 | rcu_read_unlock(); |
| 1212 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1213 | return res; |
| 1214 | } |
| 1215 | EXPORT_SYMBOL_GPL(netlink_has_listeners); |
| 1216 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1217 | static int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1218 | { |
| 1219 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1220 | |
| 1221 | if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf && |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1222 | !test_bit(NETLINK_CONGESTED, &nlk->state)) { |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1223 | netlink_skb_set_owner_r(skb, sk); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1224 | __netlink_sendskb(sk, skb); |
stephen hemminger | 2c645800 | 2011-12-22 08:52:03 +0000 | [diff] [blame] | 1225 | return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | } |
| 1227 | return -1; |
| 1228 | } |
| 1229 | |
| 1230 | struct netlink_broadcast_data { |
| 1231 | struct sock *exclude_sk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1232 | struct net *net; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1233 | u32 portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | u32 group; |
| 1235 | int failure; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1236 | int delivery_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1237 | int congested; |
| 1238 | int delivered; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 1239 | gfp_t allocation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | struct sk_buff *skb, *skb2; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1241 | int (*tx_filter)(struct sock *dsk, struct sk_buff *skb, void *data); |
| 1242 | void *tx_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1243 | }; |
| 1244 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1245 | static int do_one_broadcast(struct sock *sk, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | struct netlink_broadcast_data *p) |
| 1247 | { |
| 1248 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1249 | int val; |
| 1250 | |
| 1251 | if (p->exclude_sk == sk) |
| 1252 | goto out; |
| 1253 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1254 | if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups || |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1255 | !test_bit(p->group - 1, nlk->groups)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | goto out; |
| 1257 | |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1258 | if (!net_eq(sock_net(sk), p->net)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1259 | goto out; |
| 1260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | if (p->failure) { |
| 1262 | netlink_overrun(sk); |
| 1263 | goto out; |
| 1264 | } |
| 1265 | |
| 1266 | sock_hold(sk); |
| 1267 | if (p->skb2 == NULL) { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1268 | if (skb_shared(p->skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1269 | p->skb2 = skb_clone(p->skb, p->allocation); |
| 1270 | } else { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1271 | p->skb2 = skb_get(p->skb); |
| 1272 | /* |
| 1273 | * skb ownership may have been set when |
| 1274 | * delivered to a previous socket. |
| 1275 | */ |
| 1276 | skb_orphan(p->skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | } |
| 1278 | } |
| 1279 | if (p->skb2 == NULL) { |
| 1280 | netlink_overrun(sk); |
| 1281 | /* Clone failed. Notify ALL listeners. */ |
| 1282 | p->failure = 1; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1283 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1284 | p->delivery_failure = 1; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1285 | } else if (p->tx_filter && p->tx_filter(sk, p->skb2, p->tx_data)) { |
| 1286 | kfree_skb(p->skb2); |
| 1287 | p->skb2 = NULL; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1288 | } else if (sk_filter(sk, p->skb2)) { |
| 1289 | kfree_skb(p->skb2); |
| 1290 | p->skb2 = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | } else if ((val = netlink_broadcast_deliver(sk, p->skb2)) < 0) { |
| 1292 | netlink_overrun(sk); |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1293 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1294 | p->delivery_failure = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | } else { |
| 1296 | p->congested |= val; |
| 1297 | p->delivered = 1; |
| 1298 | p->skb2 = NULL; |
| 1299 | } |
| 1300 | sock_put(sk); |
| 1301 | |
| 1302 | out: |
| 1303 | return 0; |
| 1304 | } |
| 1305 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1306 | int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, u32 portid, |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1307 | u32 group, gfp_t allocation, |
| 1308 | int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), |
| 1309 | void *filter_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1311 | struct net *net = sock_net(ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | struct netlink_broadcast_data info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | struct sock *sk; |
| 1314 | |
| 1315 | skb = netlink_trim(skb, allocation); |
| 1316 | |
| 1317 | info.exclude_sk = ssk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1318 | info.net = net; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1319 | info.portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | info.group = group; |
| 1321 | info.failure = 0; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1322 | info.delivery_failure = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | info.congested = 0; |
| 1324 | info.delivered = 0; |
| 1325 | info.allocation = allocation; |
| 1326 | info.skb = skb; |
| 1327 | info.skb2 = NULL; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1328 | info.tx_filter = filter; |
| 1329 | info.tx_data = filter_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | |
| 1331 | /* While we sleep in clone, do not allow to change socket list */ |
| 1332 | |
| 1333 | netlink_lock_table(); |
| 1334 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1335 | sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1336 | do_one_broadcast(sk, &info); |
| 1337 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 1338 | consume_skb(skb); |
Tommy S. Christensen | aa1c6a6 | 2005-05-19 13:07:32 -0700 | [diff] [blame] | 1339 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | netlink_unlock_table(); |
| 1341 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 1342 | if (info.delivery_failure) { |
| 1343 | kfree_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1344 | return -ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1345 | } |
| 1346 | consume_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | if (info.delivered) { |
| 1349 | if (info.congested && (allocation & __GFP_WAIT)) |
| 1350 | yield(); |
| 1351 | return 0; |
| 1352 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | return -ESRCH; |
| 1354 | } |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1355 | EXPORT_SYMBOL(netlink_broadcast_filtered); |
| 1356 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1357 | int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 portid, |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1358 | u32 group, gfp_t allocation) |
| 1359 | { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1360 | return netlink_broadcast_filtered(ssk, skb, portid, group, allocation, |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1361 | NULL, NULL); |
| 1362 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1363 | EXPORT_SYMBOL(netlink_broadcast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | |
| 1365 | struct netlink_set_err_data { |
| 1366 | struct sock *exclude_sk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1367 | u32 portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1368 | u32 group; |
| 1369 | int code; |
| 1370 | }; |
| 1371 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1372 | 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] | 1373 | { |
| 1374 | struct netlink_sock *nlk = nlk_sk(sk); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1375 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | |
| 1377 | if (sk == p->exclude_sk) |
| 1378 | goto out; |
| 1379 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 1380 | if (!net_eq(sock_net(sk), sock_net(p->exclude_sk))) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1381 | goto out; |
| 1382 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1383 | if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups || |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1384 | !test_bit(p->group - 1, nlk->groups)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1385 | goto out; |
| 1386 | |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1387 | if (p->code == ENOBUFS && nlk->flags & NETLINK_RECV_NO_ENOBUFS) { |
| 1388 | ret = 1; |
| 1389 | goto out; |
| 1390 | } |
| 1391 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | sk->sk_err = p->code; |
| 1393 | sk->sk_error_report(sk); |
| 1394 | out: |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1395 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1396 | } |
| 1397 | |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 1398 | /** |
| 1399 | * netlink_set_err - report error to broadcast listeners |
| 1400 | * @ssk: the kernel netlink socket, as returned by netlink_kernel_create() |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1401 | * @portid: the PORTID of a process that we want to skip (if any) |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 1402 | * @groups: the broadcast group that will notice the error |
| 1403 | * @code: error code, must be negative (as usual in kernelspace) |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1404 | * |
| 1405 | * This function returns the number of broadcast listeners that have set the |
| 1406 | * NETLINK_RECV_NO_ENOBUFS socket option. |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 1407 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1408 | int netlink_set_err(struct sock *ssk, u32 portid, u32 group, int code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | { |
| 1410 | struct netlink_set_err_data info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | struct sock *sk; |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1412 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | |
| 1414 | info.exclude_sk = ssk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1415 | info.portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1416 | info.group = group; |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 1417 | /* sk->sk_err wants a positive error value */ |
| 1418 | info.code = -code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1419 | |
| 1420 | read_lock(&nl_table_lock); |
| 1421 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1422 | sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list) |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1423 | ret += do_one_set_err(sk, &info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1424 | |
| 1425 | read_unlock(&nl_table_lock); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 1426 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1427 | } |
Pablo Neira Ayuso | dd5b6ce | 2009-03-23 13:21:06 +0100 | [diff] [blame] | 1428 | EXPORT_SYMBOL(netlink_set_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1430 | /* must be called with netlink table grabbed */ |
| 1431 | static void netlink_update_socket_mc(struct netlink_sock *nlk, |
| 1432 | unsigned int group, |
| 1433 | int is_new) |
| 1434 | { |
| 1435 | int old, new = !!is_new, subscriptions; |
| 1436 | |
| 1437 | old = test_bit(group - 1, nlk->groups); |
| 1438 | subscriptions = nlk->subscriptions - old + new; |
| 1439 | if (new) |
| 1440 | __set_bit(group - 1, nlk->groups); |
| 1441 | else |
| 1442 | __clear_bit(group - 1, nlk->groups); |
| 1443 | netlink_update_subscriptions(&nlk->sk, subscriptions); |
| 1444 | netlink_update_listeners(&nlk->sk); |
| 1445 | } |
| 1446 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1447 | static int netlink_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1448 | char __user *optval, unsigned int optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1449 | { |
| 1450 | struct sock *sk = sock->sk; |
| 1451 | struct netlink_sock *nlk = nlk_sk(sk); |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 1452 | unsigned int val = 0; |
| 1453 | int err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1454 | |
| 1455 | if (level != SOL_NETLINK) |
| 1456 | return -ENOPROTOOPT; |
| 1457 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame^] | 1458 | if (optname != NETLINK_RX_RING && optname != NETLINK_TX_RING && |
| 1459 | optlen >= sizeof(int) && |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 1460 | get_user(val, (unsigned int __user *)optval)) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1461 | return -EFAULT; |
| 1462 | |
| 1463 | switch (optname) { |
| 1464 | case NETLINK_PKTINFO: |
| 1465 | if (val) |
| 1466 | nlk->flags |= NETLINK_RECV_PKTINFO; |
| 1467 | else |
| 1468 | nlk->flags &= ~NETLINK_RECV_PKTINFO; |
| 1469 | err = 0; |
| 1470 | break; |
| 1471 | case NETLINK_ADD_MEMBERSHIP: |
| 1472 | case NETLINK_DROP_MEMBERSHIP: { |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1473 | if (!netlink_capable(sock, NL_CFG_F_NONROOT_RECV)) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1474 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1475 | err = netlink_realloc_groups(sk); |
| 1476 | if (err) |
| 1477 | return err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1478 | if (!val || val - 1 >= nlk->ngroups) |
| 1479 | return -EINVAL; |
| 1480 | netlink_table_grab(); |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1481 | netlink_update_socket_mc(nlk, val, |
| 1482 | optname == NETLINK_ADD_MEMBERSHIP); |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1483 | netlink_table_ungrab(); |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 1484 | |
| 1485 | if (nlk->netlink_bind) |
| 1486 | nlk->netlink_bind(val); |
| 1487 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1488 | err = 0; |
| 1489 | break; |
| 1490 | } |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1491 | case NETLINK_BROADCAST_ERROR: |
| 1492 | if (val) |
| 1493 | nlk->flags |= NETLINK_BROADCAST_SEND_ERROR; |
| 1494 | else |
| 1495 | nlk->flags &= ~NETLINK_BROADCAST_SEND_ERROR; |
| 1496 | err = 0; |
| 1497 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1498 | case NETLINK_NO_ENOBUFS: |
| 1499 | if (val) { |
| 1500 | nlk->flags |= NETLINK_RECV_NO_ENOBUFS; |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1501 | clear_bit(NETLINK_CONGESTED, &nlk->state); |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1502 | wake_up_interruptible(&nlk->wait); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1503 | } else { |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1504 | nlk->flags &= ~NETLINK_RECV_NO_ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1505 | } |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1506 | err = 0; |
| 1507 | break; |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame^] | 1508 | #ifdef CONFIG_NETLINK_MMAP |
| 1509 | case NETLINK_RX_RING: |
| 1510 | case NETLINK_TX_RING: { |
| 1511 | struct nl_mmap_req req; |
| 1512 | |
| 1513 | /* Rings might consume more memory than queue limits, require |
| 1514 | * CAP_NET_ADMIN. |
| 1515 | */ |
| 1516 | if (!capable(CAP_NET_ADMIN)) |
| 1517 | return -EPERM; |
| 1518 | if (optlen < sizeof(req)) |
| 1519 | return -EINVAL; |
| 1520 | if (copy_from_user(&req, optval, sizeof(req))) |
| 1521 | return -EFAULT; |
| 1522 | err = netlink_set_ring(sk, &req, false, |
| 1523 | optname == NETLINK_TX_RING); |
| 1524 | break; |
| 1525 | } |
| 1526 | #endif /* CONFIG_NETLINK_MMAP */ |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1527 | default: |
| 1528 | err = -ENOPROTOOPT; |
| 1529 | } |
| 1530 | return err; |
| 1531 | } |
| 1532 | |
| 1533 | static int netlink_getsockopt(struct socket *sock, int level, int optname, |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1534 | char __user *optval, int __user *optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1535 | { |
| 1536 | struct sock *sk = sock->sk; |
| 1537 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1538 | int len, val, err; |
| 1539 | |
| 1540 | if (level != SOL_NETLINK) |
| 1541 | return -ENOPROTOOPT; |
| 1542 | |
| 1543 | if (get_user(len, optlen)) |
| 1544 | return -EFAULT; |
| 1545 | if (len < 0) |
| 1546 | return -EINVAL; |
| 1547 | |
| 1548 | switch (optname) { |
| 1549 | case NETLINK_PKTINFO: |
| 1550 | if (len < sizeof(int)) |
| 1551 | return -EINVAL; |
| 1552 | len = sizeof(int); |
| 1553 | val = nlk->flags & NETLINK_RECV_PKTINFO ? 1 : 0; |
Heiko Carstens | a27b58f | 2006-10-30 15:06:12 -0800 | [diff] [blame] | 1554 | if (put_user(len, optlen) || |
| 1555 | put_user(val, optval)) |
| 1556 | return -EFAULT; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1557 | err = 0; |
| 1558 | break; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1559 | case NETLINK_BROADCAST_ERROR: |
| 1560 | if (len < sizeof(int)) |
| 1561 | return -EINVAL; |
| 1562 | len = sizeof(int); |
| 1563 | val = nlk->flags & NETLINK_BROADCAST_SEND_ERROR ? 1 : 0; |
| 1564 | if (put_user(len, optlen) || |
| 1565 | put_user(val, optval)) |
| 1566 | return -EFAULT; |
| 1567 | err = 0; |
| 1568 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 1569 | case NETLINK_NO_ENOBUFS: |
| 1570 | if (len < sizeof(int)) |
| 1571 | return -EINVAL; |
| 1572 | len = sizeof(int); |
| 1573 | val = nlk->flags & NETLINK_RECV_NO_ENOBUFS ? 1 : 0; |
| 1574 | if (put_user(len, optlen) || |
| 1575 | put_user(val, optval)) |
| 1576 | return -EFAULT; |
| 1577 | err = 0; |
| 1578 | break; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 1579 | default: |
| 1580 | err = -ENOPROTOOPT; |
| 1581 | } |
| 1582 | return err; |
| 1583 | } |
| 1584 | |
| 1585 | static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
| 1586 | { |
| 1587 | struct nl_pktinfo info; |
| 1588 | |
| 1589 | info.group = NETLINK_CB(skb).dst_group; |
| 1590 | put_cmsg(msg, SOL_NETLINK, NETLINK_PKTINFO, sizeof(info), &info); |
| 1591 | } |
| 1592 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1593 | static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock, |
| 1594 | struct msghdr *msg, size_t len) |
| 1595 | { |
| 1596 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 1597 | struct sock *sk = sock->sk; |
| 1598 | struct netlink_sock *nlk = nlk_sk(sk); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1599 | struct sockaddr_nl *addr = msg->msg_name; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1600 | u32 dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1601 | u32 dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1602 | struct sk_buff *skb; |
| 1603 | int err; |
| 1604 | struct scm_cookie scm; |
| 1605 | |
| 1606 | if (msg->msg_flags&MSG_OOB) |
| 1607 | return -EOPNOTSUPP; |
| 1608 | |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1609 | if (NULL == siocb->scm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | siocb->scm = &scm; |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1611 | |
Eric Dumazet | e0e3cea | 2012-08-21 06:21:17 +0000 | [diff] [blame] | 1612 | err = scm_send(sock, msg, siocb->scm, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | if (err < 0) |
| 1614 | return err; |
| 1615 | |
| 1616 | if (msg->msg_namelen) { |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1617 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1618 | if (addr->nl_family != AF_NETLINK) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1619 | goto out; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1620 | dst_portid = addr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1621 | dst_group = ffs(addr->nl_groups); |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1622 | err = -EPERM; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1623 | if ((dst_group || dst_portid) && |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1624 | !netlink_capable(sock, NL_CFG_F_NONROOT_SEND)) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1625 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1626 | } else { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1627 | dst_portid = nlk->dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1628 | dst_group = nlk->dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | } |
| 1630 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1631 | if (!nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | err = netlink_autobind(sock); |
| 1633 | if (err) |
| 1634 | goto out; |
| 1635 | } |
| 1636 | |
| 1637 | err = -EMSGSIZE; |
| 1638 | if (len > sk->sk_sndbuf - 32) |
| 1639 | goto out; |
| 1640 | err = -ENOBUFS; |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 1641 | skb = alloc_skb(len, GFP_KERNEL); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1642 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | goto out; |
| 1644 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1645 | NETLINK_CB(skb).portid = nlk->portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1646 | NETLINK_CB(skb).dst_group = dst_group; |
Eric W. Biederman | dbe9a41 | 2012-09-06 18:20:01 +0000 | [diff] [blame] | 1647 | NETLINK_CB(skb).creds = siocb->scm->creds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1649 | err = -EFAULT; |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1650 | if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | kfree_skb(skb); |
| 1652 | goto out; |
| 1653 | } |
| 1654 | |
| 1655 | err = security_netlink_send(sk, skb); |
| 1656 | if (err) { |
| 1657 | kfree_skb(skb); |
| 1658 | goto out; |
| 1659 | } |
| 1660 | |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1661 | if (dst_group) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | atomic_inc(&skb->users); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1663 | netlink_broadcast(sk, skb, dst_portid, dst_group, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1664 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1665 | err = netlink_unicast(sk, skb, dst_portid, msg->msg_flags&MSG_DONTWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1666 | |
| 1667 | out: |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 1668 | scm_destroy(siocb->scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | return err; |
| 1670 | } |
| 1671 | |
| 1672 | static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock, |
| 1673 | struct msghdr *msg, size_t len, |
| 1674 | int flags) |
| 1675 | { |
| 1676 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 1677 | struct scm_cookie scm; |
| 1678 | struct sock *sk = sock->sk; |
| 1679 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1680 | int noblock = flags&MSG_DONTWAIT; |
| 1681 | size_t copied; |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1682 | struct sk_buff *skb, *data_skb; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1683 | int err, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | |
| 1685 | if (flags&MSG_OOB) |
| 1686 | return -EOPNOTSUPP; |
| 1687 | |
| 1688 | copied = 0; |
| 1689 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1690 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
| 1691 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1692 | goto out; |
| 1693 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1694 | data_skb = skb; |
| 1695 | |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1696 | #ifdef CONFIG_COMPAT_NETLINK_MESSAGES |
| 1697 | if (unlikely(skb_shinfo(skb)->frag_list)) { |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1698 | /* |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1699 | * If this skb has a frag_list, then here that means that we |
| 1700 | * will have to use the frag_list skb's data for compat tasks |
| 1701 | * and the regular skb's data for normal (non-compat) tasks. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1702 | * |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1703 | * If we need to send the compat skb, assign it to the |
| 1704 | * 'data_skb' variable so that it will be used below for data |
| 1705 | * copying. We keep 'skb' for everything else, including |
| 1706 | * freeing both later. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1707 | */ |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1708 | if (flags & MSG_CMSG_COMPAT) |
| 1709 | data_skb = skb_shinfo(skb)->frag_list; |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 1710 | } |
| 1711 | #endif |
| 1712 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1713 | msg->msg_namelen = 0; |
| 1714 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1715 | copied = data_skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | if (len < copied) { |
| 1717 | msg->msg_flags |= MSG_TRUNC; |
| 1718 | copied = len; |
| 1719 | } |
| 1720 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1721 | skb_reset_transport_header(data_skb); |
| 1722 | err = skb_copy_datagram_iovec(data_skb, 0, msg->msg_iov, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1723 | |
| 1724 | if (msg->msg_name) { |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1725 | struct sockaddr_nl *addr = (struct sockaddr_nl *)msg->msg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | addr->nl_family = AF_NETLINK; |
| 1727 | addr->nl_pad = 0; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1728 | addr->nl_pid = NETLINK_CB(skb).portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1729 | addr->nl_groups = netlink_group_mask(NETLINK_CB(skb).dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1730 | msg->msg_namelen = sizeof(*addr); |
| 1731 | } |
| 1732 | |
Patrick McHardy | cc9a06c | 2006-03-12 20:34:27 -0800 | [diff] [blame] | 1733 | if (nlk->flags & NETLINK_RECV_PKTINFO) |
| 1734 | netlink_cmsg_recv_pktinfo(msg, skb); |
| 1735 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | if (NULL == siocb->scm) { |
| 1737 | memset(&scm, 0, sizeof(scm)); |
| 1738 | siocb->scm = &scm; |
| 1739 | } |
| 1740 | siocb->scm->creds = *NETLINK_CREDS(skb); |
Patrick McHardy | 188ccb5 | 2007-05-03 03:27:01 -0700 | [diff] [blame] | 1741 | if (flags & MSG_TRUNC) |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 1742 | copied = data_skb->len; |
David S. Miller | daa3766 | 2010-08-15 23:21:50 -0700 | [diff] [blame] | 1743 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | skb_free_datagram(sk, skb); |
| 1745 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 1746 | if (nlk->cb && atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2) { |
| 1747 | ret = netlink_dump(sk); |
| 1748 | if (ret) { |
| 1749 | sk->sk_err = ret; |
| 1750 | sk->sk_error_report(sk); |
| 1751 | } |
| 1752 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1753 | |
| 1754 | scm_recv(sock, msg, siocb->scm, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | out: |
| 1756 | netlink_rcv_wake(sk); |
| 1757 | return err ? : copied; |
| 1758 | } |
| 1759 | |
| 1760 | static void netlink_data_ready(struct sock *sk, int len) |
| 1761 | { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1762 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1763 | } |
| 1764 | |
| 1765 | /* |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1766 | * We export these functions to other modules. They provide a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1767 | * complete set of kernel non-blocking support for message |
| 1768 | * queueing. |
| 1769 | */ |
| 1770 | |
| 1771 | struct sock * |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 1772 | __netlink_kernel_create(struct net *net, int unit, struct module *module, |
| 1773 | struct netlink_kernel_cfg *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | { |
| 1775 | struct socket *sock; |
| 1776 | struct sock *sk; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1777 | struct netlink_sock *nlk; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1778 | struct listeners *listeners = NULL; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1779 | struct mutex *cb_mutex = cfg ? cfg->cb_mutex : NULL; |
| 1780 | unsigned int groups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1781 | |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 1782 | BUG_ON(!nl_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1783 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1784 | if (unit < 0 || unit >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | return NULL; |
| 1786 | |
| 1787 | if (sock_create_lite(PF_NETLINK, SOCK_DGRAM, unit, &sock)) |
| 1788 | return NULL; |
| 1789 | |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 1790 | /* |
| 1791 | * We have to just have a reference on the net from sk, but don't |
| 1792 | * get_net it. Besides, we cannot get and then put the net here. |
| 1793 | * So we create one inside init_net and the move it to net. |
| 1794 | */ |
| 1795 | |
| 1796 | if (__netlink_create(&init_net, sock, cb_mutex, unit) < 0) |
| 1797 | goto out_sock_release_nosk; |
| 1798 | |
| 1799 | sk = sock->sk; |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1800 | sk_change_net(sk, net); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1801 | |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1802 | if (!cfg || cfg->groups < 32) |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1803 | groups = 32; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1804 | else |
| 1805 | groups = cfg->groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1806 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1807 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1808 | if (!listeners) |
| 1809 | goto out_sock_release; |
| 1810 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | sk->sk_data_ready = netlink_data_ready; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 1812 | if (cfg && cfg->input) |
| 1813 | nlk_sk(sk)->netlink_rcv = cfg->input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1814 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1815 | if (netlink_insert(sk, net, 0)) |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1816 | goto out_sock_release; |
| 1817 | |
| 1818 | nlk = nlk_sk(sk); |
| 1819 | nlk->flags |= NETLINK_KERNEL_SOCKET; |
| 1820 | |
| 1821 | netlink_table_grab(); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1822 | if (!nl_table[unit].registered) { |
| 1823 | nl_table[unit].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1824 | rcu_assign_pointer(nl_table[unit].listeners, listeners); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1825 | nl_table[unit].cb_mutex = cb_mutex; |
| 1826 | nl_table[unit].module = module; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1827 | if (cfg) { |
| 1828 | nl_table[unit].bind = cfg->bind; |
| 1829 | nl_table[unit].flags = cfg->flags; |
| 1830 | } |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1831 | nl_table[unit].registered = 1; |
Jesper Juhl | f937f1f46 | 2007-10-15 01:39:12 -0700 | [diff] [blame] | 1832 | } else { |
| 1833 | kfree(listeners); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1834 | nl_table[unit].registered++; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1835 | } |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1836 | netlink_table_ungrab(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1837 | return sk; |
| 1838 | |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1839 | out_sock_release: |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1840 | kfree(listeners); |
Denis V. Lunev | 9dfbec1 | 2008-02-29 11:17:56 -0800 | [diff] [blame] | 1841 | netlink_kernel_release(sk); |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 1842 | return NULL; |
| 1843 | |
| 1844 | out_sock_release_nosk: |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1845 | sock_release(sock); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1846 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | } |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 1848 | EXPORT_SYMBOL(__netlink_kernel_create); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 1849 | |
| 1850 | void |
| 1851 | netlink_kernel_release(struct sock *sk) |
| 1852 | { |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 1853 | sk_release_kernel(sk); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 1854 | } |
| 1855 | EXPORT_SYMBOL(netlink_kernel_release); |
| 1856 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1857 | int __netlink_change_ngroups(struct sock *sk, unsigned int groups) |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1858 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1859 | struct listeners *new, *old; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1860 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1861 | |
| 1862 | if (groups < 32) |
| 1863 | groups = 32; |
| 1864 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1865 | if (NLGRPSZ(tbl->groups) < NLGRPSZ(groups)) { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1866 | new = kzalloc(sizeof(*new) + NLGRPSZ(groups), GFP_ATOMIC); |
| 1867 | if (!new) |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1868 | return -ENOMEM; |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1869 | old = nl_deref_protected(tbl->listeners); |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1870 | memcpy(new->masks, old->masks, NLGRPSZ(tbl->groups)); |
| 1871 | rcu_assign_pointer(tbl->listeners, new); |
| 1872 | |
Lai Jiangshan | 37b6b93 | 2011-03-15 18:01:42 +0800 | [diff] [blame] | 1873 | kfree_rcu(old, rcu); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1874 | } |
| 1875 | tbl->groups = groups; |
| 1876 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1877 | return 0; |
| 1878 | } |
| 1879 | |
| 1880 | /** |
| 1881 | * netlink_change_ngroups - change number of multicast groups |
| 1882 | * |
| 1883 | * This changes the number of multicast groups that are available |
| 1884 | * on a certain netlink family. Note that it is not possible to |
| 1885 | * change the number of groups to below 32. Also note that it does |
| 1886 | * not implicitly call netlink_clear_multicast_users() when the |
| 1887 | * number of groups is reduced. |
| 1888 | * |
| 1889 | * @sk: The kernel netlink socket, as returned by netlink_kernel_create(). |
| 1890 | * @groups: The new number of groups. |
| 1891 | */ |
| 1892 | int netlink_change_ngroups(struct sock *sk, unsigned int groups) |
| 1893 | { |
| 1894 | int err; |
| 1895 | |
| 1896 | netlink_table_grab(); |
| 1897 | err = __netlink_change_ngroups(sk, groups); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1898 | netlink_table_ungrab(); |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 1899 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1900 | return err; |
| 1901 | } |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1902 | |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 1903 | void __netlink_clear_multicast_users(struct sock *ksk, unsigned int group) |
| 1904 | { |
| 1905 | struct sock *sk; |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 1906 | struct netlink_table *tbl = &nl_table[ksk->sk_protocol]; |
| 1907 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1908 | sk_for_each_bound(sk, &tbl->mc_list) |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 1909 | netlink_update_socket_mc(nlk_sk(sk), group, 0); |
| 1910 | } |
| 1911 | |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1912 | /** |
| 1913 | * netlink_clear_multicast_users - kick off multicast listeners |
| 1914 | * |
| 1915 | * This function removes all listeners from the given group. |
| 1916 | * @ksk: The kernel netlink socket, as returned by |
| 1917 | * netlink_kernel_create(). |
| 1918 | * @group: The multicast group to clear. |
| 1919 | */ |
| 1920 | void netlink_clear_multicast_users(struct sock *ksk, unsigned int group) |
| 1921 | { |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1922 | netlink_table_grab(); |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 1923 | __netlink_clear_multicast_users(ksk, group); |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1924 | netlink_table_ungrab(); |
| 1925 | } |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 1926 | |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 1927 | struct nlmsghdr * |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1928 | __nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags) |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 1929 | { |
| 1930 | struct nlmsghdr *nlh; |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 1931 | int size = nlmsg_msg_size(len); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 1932 | |
| 1933 | nlh = (struct nlmsghdr*)skb_put(skb, NLMSG_ALIGN(size)); |
| 1934 | nlh->nlmsg_type = type; |
| 1935 | nlh->nlmsg_len = size; |
| 1936 | nlh->nlmsg_flags = flags; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1937 | nlh->nlmsg_pid = portid; |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 1938 | nlh->nlmsg_seq = seq; |
| 1939 | if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0) |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 1940 | memset(nlmsg_data(nlh) + len, 0, NLMSG_ALIGN(size) - size); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 1941 | return nlh; |
| 1942 | } |
| 1943 | EXPORT_SYMBOL(__nlmsg_put); |
| 1944 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | /* |
| 1946 | * It looks a bit ugly. |
| 1947 | * It would be better to create kernel thread. |
| 1948 | */ |
| 1949 | |
| 1950 | static int netlink_dump(struct sock *sk) |
| 1951 | { |
| 1952 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1953 | struct netlink_callback *cb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1954 | struct sk_buff *skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1955 | struct nlmsghdr *nlh; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1956 | int len, err = -ENOBUFS; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1957 | int alloc_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1958 | |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1959 | mutex_lock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1960 | |
| 1961 | cb = nlk->cb; |
| 1962 | if (cb == NULL) { |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1963 | err = -EINVAL; |
| 1964 | goto errout_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1965 | } |
| 1966 | |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1967 | alloc_size = max_t(int, cb->min_dump_alloc, NLMSG_GOODSIZE); |
| 1968 | |
| 1969 | skb = sock_rmalloc(sk, alloc_size, 0, GFP_KERNEL); |
| 1970 | if (!skb) |
Dan Carpenter | c63d6ea | 2011-06-15 03:11:42 +0000 | [diff] [blame] | 1971 | goto errout_skb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 1972 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | len = cb->dump(skb, cb); |
| 1974 | |
| 1975 | if (len > 0) { |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1976 | mutex_unlock(nlk->cb_mutex); |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1977 | |
| 1978 | if (sk_filter(sk, skb)) |
| 1979 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1980 | else |
| 1981 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | return 0; |
| 1983 | } |
| 1984 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1985 | nlh = nlmsg_put_answer(skb, cb, NLMSG_DONE, sizeof(len), NLM_F_MULTI); |
| 1986 | if (!nlh) |
| 1987 | goto errout_skb; |
| 1988 | |
Johannes Berg | 670dc28 | 2011-06-20 13:40:46 +0200 | [diff] [blame] | 1989 | nl_dump_check_consistent(cb, nlh); |
| 1990 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 1991 | memcpy(nlmsg_data(nlh), &len, sizeof(len)); |
| 1992 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1993 | if (sk_filter(sk, skb)) |
| 1994 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1995 | else |
| 1996 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | |
Thomas Graf | a8f74b2 | 2005-11-10 02:25:52 +0100 | [diff] [blame] | 1998 | if (cb->done) |
| 1999 | cb->done(cb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2000 | nlk->cb = NULL; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2001 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2002 | |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2003 | module_put(cb->module); |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 2004 | netlink_consume_callback(cb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | return 0; |
Thomas Graf | 1797754 | 2005-06-18 22:53:48 -0700 | [diff] [blame] | 2006 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2007 | errout_skb: |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2008 | mutex_unlock(nlk->cb_mutex); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2009 | kfree_skb(skb); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2010 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | } |
| 2012 | |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2013 | int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
| 2014 | const struct nlmsghdr *nlh, |
| 2015 | struct netlink_dump_control *control) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2016 | { |
| 2017 | struct netlink_callback *cb; |
| 2018 | struct sock *sk; |
| 2019 | struct netlink_sock *nlk; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2020 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2021 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 2022 | cb = kzalloc(sizeof(*cb), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2023 | if (cb == NULL) |
| 2024 | return -ENOBUFS; |
| 2025 | |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 2026 | cb->dump = control->dump; |
| 2027 | cb->done = control->done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | cb->nlh = nlh; |
Pablo Neira Ayuso | 7175c88 | 2012-02-24 14:30:16 +0000 | [diff] [blame] | 2029 | cb->data = control->data; |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2030 | cb->module = control->module; |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 2031 | cb->min_dump_alloc = control->min_dump_alloc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2032 | atomic_inc(&skb->users); |
| 2033 | cb->skb = skb; |
| 2034 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2035 | sk = netlink_lookup(sock_net(ssk), ssk->sk_protocol, NETLINK_CB(skb).portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | if (sk == NULL) { |
| 2037 | netlink_destroy_callback(cb); |
| 2038 | return -ECONNREFUSED; |
| 2039 | } |
| 2040 | nlk = nlk_sk(sk); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2041 | |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2042 | mutex_lock(nlk->cb_mutex); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2043 | /* A dump is in progress... */ |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 2044 | if (nlk->cb) { |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2045 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | netlink_destroy_callback(cb); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2047 | ret = -EBUSY; |
| 2048 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2049 | } |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2050 | /* add reference of module which cb->dump belongs to */ |
| 2051 | if (!try_module_get(cb->module)) { |
| 2052 | mutex_unlock(nlk->cb_mutex); |
| 2053 | netlink_destroy_callback(cb); |
| 2054 | ret = -EPROTONOSUPPORT; |
| 2055 | goto out; |
| 2056 | } |
| 2057 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2058 | nlk->cb = cb; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2059 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2061 | ret = netlink_dump(sk); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2062 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2063 | sock_put(sk); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2064 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2065 | if (ret) |
| 2066 | return ret; |
| 2067 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2068 | /* We successfully started a dump, by returning -EINTR we |
| 2069 | * signal not to send ACK even if it was requested. |
| 2070 | */ |
| 2071 | return -EINTR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2072 | } |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2073 | EXPORT_SYMBOL(__netlink_dump_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2074 | |
| 2075 | void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err) |
| 2076 | { |
| 2077 | struct sk_buff *skb; |
| 2078 | struct nlmsghdr *rep; |
| 2079 | struct nlmsgerr *errmsg; |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2080 | size_t payload = sizeof(*errmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2081 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2082 | /* error messages get the original request appened */ |
| 2083 | if (err) |
| 2084 | payload += nlmsg_len(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2086 | skb = nlmsg_new(payload, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | if (!skb) { |
| 2088 | struct sock *sk; |
| 2089 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2090 | sk = netlink_lookup(sock_net(in_skb->sk), |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2091 | in_skb->sk->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2092 | NETLINK_CB(in_skb).portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | if (sk) { |
| 2094 | sk->sk_err = ENOBUFS; |
| 2095 | sk->sk_error_report(sk); |
| 2096 | sock_put(sk); |
| 2097 | } |
| 2098 | return; |
| 2099 | } |
| 2100 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2101 | rep = __nlmsg_put(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
John Fastabend | 5dba93a | 2009-09-25 13:11:44 +0000 | [diff] [blame] | 2102 | NLMSG_ERROR, payload, 0); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2103 | errmsg = nlmsg_data(rep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2104 | errmsg->error = err; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2105 | memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(*nlh)); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2106 | netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).portid, MSG_DONTWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2108 | EXPORT_SYMBOL(netlink_ack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2110 | 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] | 2111 | struct nlmsghdr *)) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2112 | { |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2113 | struct nlmsghdr *nlh; |
| 2114 | int err; |
| 2115 | |
| 2116 | while (skb->len >= nlmsg_total_size(0)) { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2117 | int msglen; |
| 2118 | |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 2119 | nlh = nlmsg_hdr(skb); |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2120 | err = 0; |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2121 | |
Martin Murray | ad8e4b7 | 2006-01-10 13:02:29 -0800 | [diff] [blame] | 2122 | if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2123 | return 0; |
| 2124 | |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2125 | /* Only requests are handled by the kernel */ |
| 2126 | if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2127 | goto ack; |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2128 | |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 2129 | /* Skip control messages */ |
| 2130 | if (nlh->nlmsg_type < NLMSG_MIN_TYPE) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2131 | goto ack; |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 2132 | |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 2133 | err = cb(skb, nlh); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2134 | if (err == -EINTR) |
| 2135 | goto skip; |
| 2136 | |
| 2137 | ack: |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2138 | if (nlh->nlmsg_flags & NLM_F_ACK || err) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2139 | netlink_ack(skb, nlh, err); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2140 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2141 | skip: |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2142 | msglen = NLMSG_ALIGN(nlh->nlmsg_len); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2143 | if (msglen > skb->len) |
| 2144 | msglen = skb->len; |
| 2145 | skb_pull(skb, msglen); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2146 | } |
| 2147 | |
| 2148 | return 0; |
| 2149 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2150 | EXPORT_SYMBOL(netlink_rcv_skb); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2151 | |
| 2152 | /** |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2153 | * nlmsg_notify - send a notification netlink message |
| 2154 | * @sk: netlink socket to use |
| 2155 | * @skb: notification message |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2156 | * @portid: destination netlink portid for reports or 0 |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2157 | * @group: destination multicast group or 0 |
| 2158 | * @report: 1 to report back, 0 to disable |
| 2159 | * @flags: allocation flags |
| 2160 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2161 | int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2162 | unsigned int group, int report, gfp_t flags) |
| 2163 | { |
| 2164 | int err = 0; |
| 2165 | |
| 2166 | if (group) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2167 | int exclude_portid = 0; |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2168 | |
| 2169 | if (report) { |
| 2170 | atomic_inc(&skb->users); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2171 | exclude_portid = portid; |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2172 | } |
| 2173 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2174 | /* errors reported via destination sk->sk_err, but propagate |
| 2175 | * delivery errors if NETLINK_BROADCAST_ERROR flag is set */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2176 | err = nlmsg_multicast(sk, skb, exclude_portid, group, flags); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2177 | } |
| 2178 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2179 | if (report) { |
| 2180 | int err2; |
| 2181 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2182 | err2 = nlmsg_unicast(sk, skb, portid); |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2183 | if (!err || err == -ESRCH) |
| 2184 | err = err2; |
| 2185 | } |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2186 | |
| 2187 | return err; |
| 2188 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2189 | EXPORT_SYMBOL(nlmsg_notify); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2190 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2191 | #ifdef CONFIG_PROC_FS |
| 2192 | struct nl_seq_iter { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2193 | struct seq_net_private p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | int link; |
| 2195 | int hash_idx; |
| 2196 | }; |
| 2197 | |
| 2198 | static struct sock *netlink_seq_socket_idx(struct seq_file *seq, loff_t pos) |
| 2199 | { |
| 2200 | struct nl_seq_iter *iter = seq->private; |
| 2201 | int i, j; |
| 2202 | struct sock *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2203 | loff_t off = 0; |
| 2204 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2205 | for (i = 0; i < MAX_LINKS; i++) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2206 | struct nl_portid_hash *hash = &nl_table[i].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2207 | |
| 2208 | for (j = 0; j <= hash->mask; j++) { |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2209 | sk_for_each(s, &hash->table[j]) { |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2210 | if (sock_net(s) != seq_file_net(seq)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2211 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2212 | if (off == pos) { |
| 2213 | iter->link = i; |
| 2214 | iter->hash_idx = j; |
| 2215 | return s; |
| 2216 | } |
| 2217 | ++off; |
| 2218 | } |
| 2219 | } |
| 2220 | } |
| 2221 | return NULL; |
| 2222 | } |
| 2223 | |
| 2224 | static void *netlink_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 2225 | __acquires(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | { |
| 2227 | read_lock(&nl_table_lock); |
| 2228 | return *pos ? netlink_seq_socket_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2229 | } |
| 2230 | |
| 2231 | static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2232 | { |
| 2233 | struct sock *s; |
| 2234 | struct nl_seq_iter *iter; |
| 2235 | int i, j; |
| 2236 | |
| 2237 | ++*pos; |
| 2238 | |
| 2239 | if (v == SEQ_START_TOKEN) |
| 2240 | return netlink_seq_socket_idx(seq, 0); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2241 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2242 | iter = seq->private; |
| 2243 | s = v; |
| 2244 | do { |
| 2245 | s = sk_next(s); |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2246 | } while (s && sock_net(s) != seq_file_net(seq)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | if (s) |
| 2248 | return s; |
| 2249 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | i = iter->link; |
| 2251 | j = iter->hash_idx + 1; |
| 2252 | |
| 2253 | do { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2254 | struct nl_portid_hash *hash = &nl_table[i].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2255 | |
| 2256 | for (; j <= hash->mask; j++) { |
| 2257 | s = sk_head(&hash->table[j]); |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2258 | while (s && sock_net(s) != seq_file_net(seq)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2259 | s = sk_next(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2260 | if (s) { |
| 2261 | iter->link = i; |
| 2262 | iter->hash_idx = j; |
| 2263 | return s; |
| 2264 | } |
| 2265 | } |
| 2266 | |
| 2267 | j = 0; |
| 2268 | } while (++i < MAX_LINKS); |
| 2269 | |
| 2270 | return NULL; |
| 2271 | } |
| 2272 | |
| 2273 | static void netlink_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 2274 | __releases(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2275 | { |
| 2276 | read_unlock(&nl_table_lock); |
| 2277 | } |
| 2278 | |
| 2279 | |
| 2280 | static int netlink_seq_show(struct seq_file *seq, void *v) |
| 2281 | { |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2282 | if (v == SEQ_START_TOKEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2283 | seq_puts(seq, |
| 2284 | "sk Eth Pid Groups " |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 2285 | "Rmem Wmem Dump Locks Drops Inode\n"); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2286 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | struct sock *s = v; |
| 2288 | struct netlink_sock *nlk = nlk_sk(s); |
| 2289 | |
Hannes Frederic Sowa | 9f1e0ad | 2012-12-15 15:09:19 +0000 | [diff] [blame] | 2290 | seq_printf(seq, "%pK %-3d %-6u %08x %-8d %-8d %pK %-8d %-8d %-8lu\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2291 | s, |
| 2292 | s->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2293 | nlk->portid, |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 2294 | nlk->groups ? (u32)nlk->groups[0] : 0, |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 2295 | sk_rmem_alloc_get(s), |
| 2296 | sk_wmem_alloc_get(s), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2297 | nlk->cb, |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2298 | atomic_read(&s->sk_refcnt), |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 2299 | atomic_read(&s->sk_drops), |
| 2300 | sock_i_ino(s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | ); |
| 2302 | |
| 2303 | } |
| 2304 | return 0; |
| 2305 | } |
| 2306 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 2307 | static const struct seq_operations netlink_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2308 | .start = netlink_seq_start, |
| 2309 | .next = netlink_seq_next, |
| 2310 | .stop = netlink_seq_stop, |
| 2311 | .show = netlink_seq_show, |
| 2312 | }; |
| 2313 | |
| 2314 | |
| 2315 | static int netlink_seq_open(struct inode *inode, struct file *file) |
| 2316 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2317 | return seq_open_net(inode, file, &netlink_seq_ops, |
| 2318 | sizeof(struct nl_seq_iter)); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2319 | } |
| 2320 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 2321 | static const struct file_operations netlink_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | .owner = THIS_MODULE, |
| 2323 | .open = netlink_seq_open, |
| 2324 | .read = seq_read, |
| 2325 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2326 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2327 | }; |
| 2328 | |
| 2329 | #endif |
| 2330 | |
| 2331 | int netlink_register_notifier(struct notifier_block *nb) |
| 2332 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2333 | return atomic_notifier_chain_register(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2334 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2335 | EXPORT_SYMBOL(netlink_register_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | |
| 2337 | int netlink_unregister_notifier(struct notifier_block *nb) |
| 2338 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 2339 | return atomic_notifier_chain_unregister(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2340 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2341 | EXPORT_SYMBOL(netlink_unregister_notifier); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2342 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 2343 | static const struct proto_ops netlink_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2344 | .family = PF_NETLINK, |
| 2345 | .owner = THIS_MODULE, |
| 2346 | .release = netlink_release, |
| 2347 | .bind = netlink_bind, |
| 2348 | .connect = netlink_connect, |
| 2349 | .socketpair = sock_no_socketpair, |
| 2350 | .accept = sock_no_accept, |
| 2351 | .getname = netlink_getname, |
| 2352 | .poll = datagram_poll, |
| 2353 | .ioctl = sock_no_ioctl, |
| 2354 | .listen = sock_no_listen, |
| 2355 | .shutdown = sock_no_shutdown, |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2356 | .setsockopt = netlink_setsockopt, |
| 2357 | .getsockopt = netlink_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2358 | .sendmsg = netlink_sendmsg, |
| 2359 | .recvmsg = netlink_recvmsg, |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame^] | 2360 | .mmap = netlink_mmap, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | .sendpage = sock_no_sendpage, |
| 2362 | }; |
| 2363 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 2364 | static const struct net_proto_family netlink_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2365 | .family = PF_NETLINK, |
| 2366 | .create = netlink_create, |
| 2367 | .owner = THIS_MODULE, /* for consistency 8) */ |
| 2368 | }; |
| 2369 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 2370 | static int __net_init netlink_net_init(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2371 | { |
| 2372 | #ifdef CONFIG_PROC_FS |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 2373 | if (!proc_create("netlink", 0, net->proc_net, &netlink_seq_fops)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2374 | return -ENOMEM; |
| 2375 | #endif |
| 2376 | return 0; |
| 2377 | } |
| 2378 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 2379 | static void __net_exit netlink_net_exit(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2380 | { |
| 2381 | #ifdef CONFIG_PROC_FS |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 2382 | remove_proc_entry("netlink", net->proc_net); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2383 | #endif |
| 2384 | } |
| 2385 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2386 | static void __init netlink_add_usersock_entry(void) |
| 2387 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2388 | struct listeners *listeners; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2389 | int groups = 32; |
| 2390 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2391 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2392 | if (!listeners) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2393 | panic("netlink_add_usersock_entry: Cannot allocate listeners\n"); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2394 | |
| 2395 | netlink_table_grab(); |
| 2396 | |
| 2397 | nl_table[NETLINK_USERSOCK].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2398 | rcu_assign_pointer(nl_table[NETLINK_USERSOCK].listeners, listeners); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2399 | nl_table[NETLINK_USERSOCK].module = THIS_MODULE; |
| 2400 | nl_table[NETLINK_USERSOCK].registered = 1; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 2401 | nl_table[NETLINK_USERSOCK].flags = NL_CFG_F_NONROOT_SEND; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2402 | |
| 2403 | netlink_table_ungrab(); |
| 2404 | } |
| 2405 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 2406 | static struct pernet_operations __net_initdata netlink_net_ops = { |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2407 | .init = netlink_net_init, |
| 2408 | .exit = netlink_net_exit, |
| 2409 | }; |
| 2410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2411 | static int __init netlink_proto_init(void) |
| 2412 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2413 | int i; |
Denis Cheng | 26ff5dd | 2007-09-16 16:36:02 -0700 | [diff] [blame] | 2414 | unsigned long limit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | unsigned int order; |
| 2416 | int err = proto_register(&netlink_proto, 0); |
| 2417 | |
| 2418 | if (err != 0) |
| 2419 | goto out; |
| 2420 | |
YOSHIFUJI Hideaki / 吉藤英明 | fab2574 | 2013-01-09 07:19:48 +0000 | [diff] [blame] | 2421 | BUILD_BUG_ON(sizeof(struct netlink_skb_parms) > FIELD_SIZEOF(struct sk_buff, cb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2422 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 2423 | nl_table = kcalloc(MAX_LINKS, sizeof(*nl_table), GFP_KERNEL); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2424 | if (!nl_table) |
| 2425 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 2427 | if (totalram_pages >= (128 * 1024)) |
| 2428 | limit = totalram_pages >> (21 - PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | else |
Jan Beulich | 4481374 | 2009-09-21 17:03:05 -0700 | [diff] [blame] | 2430 | limit = totalram_pages >> (23 - PAGE_SHIFT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2431 | |
Denis Cheng | 26ff5dd | 2007-09-16 16:36:02 -0700 | [diff] [blame] | 2432 | order = get_bitmask_order(limit) - 1 + PAGE_SHIFT; |
| 2433 | limit = (1UL << order) / sizeof(struct hlist_head); |
| 2434 | order = get_bitmask_order(min(limit, (unsigned long)UINT_MAX)) - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2435 | |
| 2436 | for (i = 0; i < MAX_LINKS; i++) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2437 | struct nl_portid_hash *hash = &nl_table[i].hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2438 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2439 | hash->table = nl_portid_hash_zalloc(1 * sizeof(*hash->table)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2440 | if (!hash->table) { |
| 2441 | while (i-- > 0) |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2442 | nl_portid_hash_free(nl_table[i].hash.table, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2443 | 1 * sizeof(*hash->table)); |
| 2444 | kfree(nl_table); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2445 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2446 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2447 | hash->max_shift = order; |
| 2448 | hash->shift = 0; |
| 2449 | hash->mask = 0; |
| 2450 | hash->rehash_time = jiffies; |
| 2451 | } |
| 2452 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 2453 | netlink_add_usersock_entry(); |
| 2454 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2455 | sock_register(&netlink_family_ops); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2456 | register_pernet_subsys(&netlink_net_ops); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2457 | /* The netlink device handler may be needed early. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2458 | rtnetlink_init(); |
| 2459 | out: |
| 2460 | return err; |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2461 | panic: |
| 2462 | panic("netlink_init: Cannot allocate nl_table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2463 | } |
| 2464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2465 | core_initcall(netlink_proto_init); |