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> |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 6 | * Patrick McHardy <kaber@trash.net> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 12 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * Tue Jun 26 14:36:48 MEST 2001 Herbert "herp" Rosmanith |
| 14 | * added netlink_proto_exit |
| 15 | * Tue Jan 22 18:32:44 BRST 2002 Arnaldo C. de Melo <acme@conectiva.com.br> |
| 16 | * use nlk_sk, as sk->protinfo is on a diet 8) |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 17 | * Fri Jul 22 19:51:12 MEST 2005 Harald Welte <laforge@gnumonks.org> |
| 18 | * - inc module use count of module that owns |
| 19 | * the kernel socket in case userspace opens |
| 20 | * socket of same protocol |
| 21 | * - remove all module support, since netlink is |
| 22 | * mandatory if CONFIG_NET=y these days |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | */ |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/module.h> |
| 26 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 27 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/kernel.h> |
| 29 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/signal.h> |
| 31 | #include <linux/sched.h> |
| 32 | #include <linux/errno.h> |
| 33 | #include <linux/string.h> |
| 34 | #include <linux/stat.h> |
| 35 | #include <linux/socket.h> |
| 36 | #include <linux/un.h> |
| 37 | #include <linux/fcntl.h> |
| 38 | #include <linux/termios.h> |
| 39 | #include <linux/sockios.h> |
| 40 | #include <linux/net.h> |
| 41 | #include <linux/fs.h> |
| 42 | #include <linux/slab.h> |
| 43 | #include <asm/uaccess.h> |
| 44 | #include <linux/skbuff.h> |
| 45 | #include <linux/netdevice.h> |
| 46 | #include <linux/rtnetlink.h> |
| 47 | #include <linux/proc_fs.h> |
| 48 | #include <linux/seq_file.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <linux/notifier.h> |
| 50 | #include <linux/security.h> |
| 51 | #include <linux/jhash.h> |
| 52 | #include <linux/jiffies.h> |
| 53 | #include <linux/random.h> |
| 54 | #include <linux/bitops.h> |
| 55 | #include <linux/mm.h> |
| 56 | #include <linux/types.h> |
Andrew Morton | 54e0f52 | 2005-04-30 07:07:04 +0100 | [diff] [blame] | 57 | #include <linux/audit.h> |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 58 | #include <linux/mutex.h> |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 59 | #include <linux/vmalloc.h> |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 60 | #include <linux/if_arp.h> |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 61 | #include <linux/rhashtable.h> |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 62 | #include <asm/cacheflush.h> |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 63 | #include <linux/hash.h> |
Andrew Morton | 54e0f52 | 2005-04-30 07:07:04 +0100 | [diff] [blame] | 64 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 65 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | #include <net/sock.h> |
| 67 | #include <net/scm.h> |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 68 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 70 | #include "af_netlink.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 72 | struct listeners { |
| 73 | struct rcu_head rcu; |
| 74 | unsigned long masks[0]; |
Johannes Berg | 6c04bb1 | 2009-07-10 09:51:32 +0000 | [diff] [blame] | 75 | }; |
| 76 | |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 77 | /* state bits */ |
| 78 | #define NETLINK_CONGESTED 0x0 |
| 79 | |
| 80 | /* flags */ |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 81 | #define NETLINK_KERNEL_SOCKET 0x1 |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 82 | #define NETLINK_RECV_PKTINFO 0x2 |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 83 | #define NETLINK_BROADCAST_SEND_ERROR 0x4 |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 84 | #define NETLINK_RECV_NO_ENOBUFS 0x8 |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 85 | |
David S. Miller | 035c4c1 | 2011-12-23 17:33:03 -0500 | [diff] [blame] | 86 | static inline int netlink_is_kernel(struct sock *sk) |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 87 | { |
| 88 | return nlk_sk(sk)->flags & NETLINK_KERNEL_SOCKET; |
| 89 | } |
| 90 | |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 91 | struct netlink_table *nl_table; |
| 92 | EXPORT_SYMBOL_GPL(nl_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
| 94 | static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait); |
| 95 | |
| 96 | static int netlink_dump(struct sock *sk); |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 97 | static void netlink_skb_destructor(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 99 | /* nl_table locking explained: |
| 100 | * Lookup and traversal are protected with nl_sk_hash_lock or nl_table_lock |
| 101 | * combined with an RCU read-side lock. Insertion and removal are protected |
| 102 | * with nl_sk_hash_lock while using RCU list modification primitives and may |
| 103 | * run in parallel to nl_table_lock protected lookups. Destruction of the |
| 104 | * Netlink socket may only occur *after* nl_table_lock has been acquired |
| 105 | * either during or after the socket has been removed from the list. |
| 106 | */ |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 107 | DEFINE_RWLOCK(nl_table_lock); |
| 108 | EXPORT_SYMBOL_GPL(nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | static atomic_t nl_table_users = ATOMIC_INIT(0); |
| 110 | |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 111 | #define nl_deref_protected(X) rcu_dereference_protected(X, lockdep_is_held(&nl_table_lock)); |
| 112 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 113 | /* Protects netlink socket hash table mutations */ |
| 114 | DEFINE_MUTEX(nl_sk_hash_lock); |
Thomas Graf | 6c8f7e7 | 2014-08-07 00:18:47 +0100 | [diff] [blame] | 115 | EXPORT_SYMBOL_GPL(nl_sk_hash_lock); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 116 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 117 | static ATOMIC_NOTIFIER_HEAD(netlink_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 119 | static DEFINE_SPINLOCK(netlink_tap_lock); |
| 120 | static struct list_head netlink_tap_all __read_mostly; |
| 121 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 122 | static inline u32 netlink_group_mask(u32 group) |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 123 | { |
| 124 | return group ? 1 << (group - 1) : 0; |
| 125 | } |
| 126 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 127 | int netlink_add_tap(struct netlink_tap *nt) |
| 128 | { |
| 129 | if (unlikely(nt->dev->type != ARPHRD_NETLINK)) |
| 130 | return -EINVAL; |
| 131 | |
| 132 | spin_lock(&netlink_tap_lock); |
| 133 | list_add_rcu(&nt->list, &netlink_tap_all); |
| 134 | spin_unlock(&netlink_tap_lock); |
| 135 | |
Markus Elfring | fcd4d35 | 2014-11-18 21:03:13 +0100 | [diff] [blame] | 136 | __module_get(nt->module); |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 137 | |
| 138 | return 0; |
| 139 | } |
| 140 | EXPORT_SYMBOL_GPL(netlink_add_tap); |
| 141 | |
stephen hemminger | 2173f8d | 2013-12-30 10:49:22 -0800 | [diff] [blame] | 142 | static int __netlink_remove_tap(struct netlink_tap *nt) |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 143 | { |
| 144 | bool found = false; |
| 145 | struct netlink_tap *tmp; |
| 146 | |
| 147 | spin_lock(&netlink_tap_lock); |
| 148 | |
| 149 | list_for_each_entry(tmp, &netlink_tap_all, list) { |
| 150 | if (nt == tmp) { |
| 151 | list_del_rcu(&nt->list); |
| 152 | found = true; |
| 153 | goto out; |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | pr_warn("__netlink_remove_tap: %p not found\n", nt); |
| 158 | out: |
| 159 | spin_unlock(&netlink_tap_lock); |
| 160 | |
| 161 | if (found && nt->module) |
| 162 | module_put(nt->module); |
| 163 | |
| 164 | return found ? 0 : -ENODEV; |
| 165 | } |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 166 | |
| 167 | int netlink_remove_tap(struct netlink_tap *nt) |
| 168 | { |
| 169 | int ret; |
| 170 | |
| 171 | ret = __netlink_remove_tap(nt); |
| 172 | synchronize_net(); |
| 173 | |
| 174 | return ret; |
| 175 | } |
| 176 | EXPORT_SYMBOL_GPL(netlink_remove_tap); |
| 177 | |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 178 | static bool netlink_filter_tap(const struct sk_buff *skb) |
| 179 | { |
| 180 | struct sock *sk = skb->sk; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 181 | |
| 182 | /* We take the more conservative approach and |
| 183 | * whitelist socket protocols that may pass. |
| 184 | */ |
| 185 | switch (sk->sk_protocol) { |
| 186 | case NETLINK_ROUTE: |
| 187 | case NETLINK_USERSOCK: |
| 188 | case NETLINK_SOCK_DIAG: |
| 189 | case NETLINK_NFLOG: |
| 190 | case NETLINK_XFRM: |
| 191 | case NETLINK_FIB_LOOKUP: |
| 192 | case NETLINK_NETFILTER: |
| 193 | case NETLINK_GENERIC: |
Varka Bhadram | 498044b | 2014-07-16 10:59:47 +0530 | [diff] [blame] | 194 | return true; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 195 | } |
| 196 | |
Varka Bhadram | 498044b | 2014-07-16 10:59:47 +0530 | [diff] [blame] | 197 | return false; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 198 | } |
| 199 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 200 | static int __netlink_deliver_tap_skb(struct sk_buff *skb, |
| 201 | struct net_device *dev) |
| 202 | { |
| 203 | struct sk_buff *nskb; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 204 | struct sock *sk = skb->sk; |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 205 | int ret = -ENOMEM; |
| 206 | |
| 207 | dev_hold(dev); |
| 208 | nskb = skb_clone(skb, GFP_ATOMIC); |
| 209 | if (nskb) { |
| 210 | nskb->dev = dev; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 211 | nskb->protocol = htons((u16) sk->sk_protocol); |
Daniel Borkmann | 604d13c | 2013-12-23 14:35:56 +0100 | [diff] [blame] | 212 | nskb->pkt_type = netlink_is_kernel(sk) ? |
| 213 | PACKET_KERNEL : PACKET_USER; |
Daniel Borkmann | 4e48ed8 | 2014-08-07 22:22:47 +0200 | [diff] [blame] | 214 | skb_reset_network_header(nskb); |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 215 | ret = dev_queue_xmit(nskb); |
| 216 | if (unlikely(ret > 0)) |
| 217 | ret = net_xmit_errno(ret); |
| 218 | } |
| 219 | |
| 220 | dev_put(dev); |
| 221 | return ret; |
| 222 | } |
| 223 | |
| 224 | static void __netlink_deliver_tap(struct sk_buff *skb) |
| 225 | { |
| 226 | int ret; |
| 227 | struct netlink_tap *tmp; |
| 228 | |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 229 | if (!netlink_filter_tap(skb)) |
| 230 | return; |
| 231 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 232 | list_for_each_entry_rcu(tmp, &netlink_tap_all, list) { |
| 233 | ret = __netlink_deliver_tap_skb(skb, tmp->dev); |
| 234 | if (unlikely(ret)) |
| 235 | break; |
| 236 | } |
| 237 | } |
| 238 | |
| 239 | static void netlink_deliver_tap(struct sk_buff *skb) |
| 240 | { |
| 241 | rcu_read_lock(); |
| 242 | |
| 243 | if (unlikely(!list_empty(&netlink_tap_all))) |
| 244 | __netlink_deliver_tap(skb); |
| 245 | |
| 246 | rcu_read_unlock(); |
| 247 | } |
| 248 | |
Daniel Borkmann | 73bfd37 | 2013-12-23 14:35:55 +0100 | [diff] [blame] | 249 | static void netlink_deliver_tap_kernel(struct sock *dst, struct sock *src, |
| 250 | struct sk_buff *skb) |
| 251 | { |
| 252 | if (!(netlink_is_kernel(dst) && netlink_is_kernel(src))) |
| 253 | netlink_deliver_tap(skb); |
| 254 | } |
| 255 | |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 256 | static void netlink_overrun(struct sock *sk) |
| 257 | { |
| 258 | struct netlink_sock *nlk = nlk_sk(sk); |
| 259 | |
| 260 | if (!(nlk->flags & NETLINK_RECV_NO_ENOBUFS)) { |
| 261 | if (!test_and_set_bit(NETLINK_CONGESTED, &nlk_sk(sk)->state)) { |
| 262 | sk->sk_err = ENOBUFS; |
| 263 | sk->sk_error_report(sk); |
| 264 | } |
| 265 | } |
| 266 | atomic_inc(&sk->sk_drops); |
| 267 | } |
| 268 | |
| 269 | static void netlink_rcv_wake(struct sock *sk) |
| 270 | { |
| 271 | struct netlink_sock *nlk = nlk_sk(sk); |
| 272 | |
| 273 | if (skb_queue_empty(&sk->sk_receive_queue)) |
| 274 | clear_bit(NETLINK_CONGESTED, &nlk->state); |
| 275 | if (!test_bit(NETLINK_CONGESTED, &nlk->state)) |
| 276 | wake_up_interruptible(&nlk->wait); |
| 277 | } |
| 278 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 279 | #ifdef CONFIG_NETLINK_MMAP |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 280 | static bool netlink_skb_is_mmaped(const struct sk_buff *skb) |
| 281 | { |
| 282 | return NETLINK_CB(skb).flags & NETLINK_SKB_MMAPED; |
| 283 | } |
| 284 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 285 | static bool netlink_rx_is_mmaped(struct sock *sk) |
| 286 | { |
| 287 | return nlk_sk(sk)->rx_ring.pg_vec != NULL; |
| 288 | } |
| 289 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 290 | static bool netlink_tx_is_mmaped(struct sock *sk) |
| 291 | { |
| 292 | return nlk_sk(sk)->tx_ring.pg_vec != NULL; |
| 293 | } |
| 294 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 295 | static __pure struct page *pgvec_to_page(const void *addr) |
| 296 | { |
| 297 | if (is_vmalloc_addr(addr)) |
| 298 | return vmalloc_to_page(addr); |
| 299 | else |
| 300 | return virt_to_page(addr); |
| 301 | } |
| 302 | |
| 303 | static void free_pg_vec(void **pg_vec, unsigned int order, unsigned int len) |
| 304 | { |
| 305 | unsigned int i; |
| 306 | |
| 307 | for (i = 0; i < len; i++) { |
| 308 | if (pg_vec[i] != NULL) { |
| 309 | if (is_vmalloc_addr(pg_vec[i])) |
| 310 | vfree(pg_vec[i]); |
| 311 | else |
| 312 | free_pages((unsigned long)pg_vec[i], order); |
| 313 | } |
| 314 | } |
| 315 | kfree(pg_vec); |
| 316 | } |
| 317 | |
| 318 | static void *alloc_one_pg_vec_page(unsigned long order) |
| 319 | { |
| 320 | void *buffer; |
| 321 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | |
| 322 | __GFP_NOWARN | __GFP_NORETRY; |
| 323 | |
| 324 | buffer = (void *)__get_free_pages(gfp_flags, order); |
| 325 | if (buffer != NULL) |
| 326 | return buffer; |
| 327 | |
| 328 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
| 329 | if (buffer != NULL) |
| 330 | return buffer; |
| 331 | |
| 332 | gfp_flags &= ~__GFP_NORETRY; |
| 333 | return (void *)__get_free_pages(gfp_flags, order); |
| 334 | } |
| 335 | |
| 336 | static void **alloc_pg_vec(struct netlink_sock *nlk, |
| 337 | struct nl_mmap_req *req, unsigned int order) |
| 338 | { |
| 339 | unsigned int block_nr = req->nm_block_nr; |
| 340 | unsigned int i; |
Daniel Borkmann | 8a849bb | 2013-08-02 17:32:39 +0200 | [diff] [blame] | 341 | void **pg_vec; |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 342 | |
| 343 | pg_vec = kcalloc(block_nr, sizeof(void *), GFP_KERNEL); |
| 344 | if (pg_vec == NULL) |
| 345 | return NULL; |
| 346 | |
| 347 | for (i = 0; i < block_nr; i++) { |
Daniel Borkmann | 8a849bb | 2013-08-02 17:32:39 +0200 | [diff] [blame] | 348 | pg_vec[i] = alloc_one_pg_vec_page(order); |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 349 | if (pg_vec[i] == NULL) |
| 350 | goto err1; |
| 351 | } |
| 352 | |
| 353 | return pg_vec; |
| 354 | err1: |
| 355 | free_pg_vec(pg_vec, order, block_nr); |
| 356 | return NULL; |
| 357 | } |
| 358 | |
| 359 | static int netlink_set_ring(struct sock *sk, struct nl_mmap_req *req, |
| 360 | bool closing, bool tx_ring) |
| 361 | { |
| 362 | struct netlink_sock *nlk = nlk_sk(sk); |
| 363 | struct netlink_ring *ring; |
| 364 | struct sk_buff_head *queue; |
| 365 | void **pg_vec = NULL; |
| 366 | unsigned int order = 0; |
| 367 | int err; |
| 368 | |
| 369 | ring = tx_ring ? &nlk->tx_ring : &nlk->rx_ring; |
| 370 | queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; |
| 371 | |
| 372 | if (!closing) { |
| 373 | if (atomic_read(&nlk->mapped)) |
| 374 | return -EBUSY; |
| 375 | if (atomic_read(&ring->pending)) |
| 376 | return -EBUSY; |
| 377 | } |
| 378 | |
| 379 | if (req->nm_block_nr) { |
| 380 | if (ring->pg_vec != NULL) |
| 381 | return -EBUSY; |
| 382 | |
| 383 | if ((int)req->nm_block_size <= 0) |
| 384 | return -EINVAL; |
Tobias Klauser | 74e83b2 | 2014-07-31 12:17:08 +0200 | [diff] [blame] | 385 | if (!PAGE_ALIGNED(req->nm_block_size)) |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 386 | return -EINVAL; |
| 387 | if (req->nm_frame_size < NL_MMAP_HDRLEN) |
| 388 | return -EINVAL; |
| 389 | if (!IS_ALIGNED(req->nm_frame_size, NL_MMAP_MSG_ALIGNMENT)) |
| 390 | return -EINVAL; |
| 391 | |
| 392 | ring->frames_per_block = req->nm_block_size / |
| 393 | req->nm_frame_size; |
| 394 | if (ring->frames_per_block == 0) |
| 395 | return -EINVAL; |
| 396 | if (ring->frames_per_block * req->nm_block_nr != |
| 397 | req->nm_frame_nr) |
| 398 | return -EINVAL; |
| 399 | |
| 400 | order = get_order(req->nm_block_size); |
| 401 | pg_vec = alloc_pg_vec(nlk, req, order); |
| 402 | if (pg_vec == NULL) |
| 403 | return -ENOMEM; |
| 404 | } else { |
| 405 | if (req->nm_frame_nr) |
| 406 | return -EINVAL; |
| 407 | } |
| 408 | |
| 409 | err = -EBUSY; |
| 410 | mutex_lock(&nlk->pg_vec_lock); |
| 411 | if (closing || atomic_read(&nlk->mapped) == 0) { |
| 412 | err = 0; |
| 413 | spin_lock_bh(&queue->lock); |
| 414 | |
| 415 | ring->frame_max = req->nm_frame_nr - 1; |
| 416 | ring->head = 0; |
| 417 | ring->frame_size = req->nm_frame_size; |
| 418 | ring->pg_vec_pages = req->nm_block_size / PAGE_SIZE; |
| 419 | |
| 420 | swap(ring->pg_vec_len, req->nm_block_nr); |
| 421 | swap(ring->pg_vec_order, order); |
| 422 | swap(ring->pg_vec, pg_vec); |
| 423 | |
| 424 | __skb_queue_purge(queue); |
| 425 | spin_unlock_bh(&queue->lock); |
| 426 | |
| 427 | WARN_ON(atomic_read(&nlk->mapped)); |
| 428 | } |
| 429 | mutex_unlock(&nlk->pg_vec_lock); |
| 430 | |
| 431 | if (pg_vec) |
| 432 | free_pg_vec(pg_vec, order, req->nm_block_nr); |
| 433 | return err; |
| 434 | } |
| 435 | |
| 436 | static void netlink_mm_open(struct vm_area_struct *vma) |
| 437 | { |
| 438 | struct file *file = vma->vm_file; |
| 439 | struct socket *sock = file->private_data; |
| 440 | struct sock *sk = sock->sk; |
| 441 | |
| 442 | if (sk) |
| 443 | atomic_inc(&nlk_sk(sk)->mapped); |
| 444 | } |
| 445 | |
| 446 | static void netlink_mm_close(struct vm_area_struct *vma) |
| 447 | { |
| 448 | struct file *file = vma->vm_file; |
| 449 | struct socket *sock = file->private_data; |
| 450 | struct sock *sk = sock->sk; |
| 451 | |
| 452 | if (sk) |
| 453 | atomic_dec(&nlk_sk(sk)->mapped); |
| 454 | } |
| 455 | |
| 456 | static const struct vm_operations_struct netlink_mmap_ops = { |
| 457 | .open = netlink_mm_open, |
| 458 | .close = netlink_mm_close, |
| 459 | }; |
| 460 | |
| 461 | static int netlink_mmap(struct file *file, struct socket *sock, |
| 462 | struct vm_area_struct *vma) |
| 463 | { |
| 464 | struct sock *sk = sock->sk; |
| 465 | struct netlink_sock *nlk = nlk_sk(sk); |
| 466 | struct netlink_ring *ring; |
| 467 | unsigned long start, size, expected; |
| 468 | unsigned int i; |
| 469 | int err = -EINVAL; |
| 470 | |
| 471 | if (vma->vm_pgoff) |
| 472 | return -EINVAL; |
| 473 | |
| 474 | mutex_lock(&nlk->pg_vec_lock); |
| 475 | |
| 476 | expected = 0; |
| 477 | for (ring = &nlk->rx_ring; ring <= &nlk->tx_ring; ring++) { |
| 478 | if (ring->pg_vec == NULL) |
| 479 | continue; |
| 480 | expected += ring->pg_vec_len * ring->pg_vec_pages * PAGE_SIZE; |
| 481 | } |
| 482 | |
| 483 | if (expected == 0) |
| 484 | goto out; |
| 485 | |
| 486 | size = vma->vm_end - vma->vm_start; |
| 487 | if (size != expected) |
| 488 | goto out; |
| 489 | |
| 490 | start = vma->vm_start; |
| 491 | for (ring = &nlk->rx_ring; ring <= &nlk->tx_ring; ring++) { |
| 492 | if (ring->pg_vec == NULL) |
| 493 | continue; |
| 494 | |
| 495 | for (i = 0; i < ring->pg_vec_len; i++) { |
| 496 | struct page *page; |
| 497 | void *kaddr = ring->pg_vec[i]; |
| 498 | unsigned int pg_num; |
| 499 | |
| 500 | for (pg_num = 0; pg_num < ring->pg_vec_pages; pg_num++) { |
| 501 | page = pgvec_to_page(kaddr); |
| 502 | err = vm_insert_page(vma, start, page); |
| 503 | if (err < 0) |
| 504 | goto out; |
| 505 | start += PAGE_SIZE; |
| 506 | kaddr += PAGE_SIZE; |
| 507 | } |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | atomic_inc(&nlk->mapped); |
| 512 | vma->vm_ops = &netlink_mmap_ops; |
| 513 | err = 0; |
| 514 | out: |
| 515 | mutex_unlock(&nlk->pg_vec_lock); |
Patrick McHardy | 7cdbac7 | 2013-06-11 02:52:47 -0700 | [diff] [blame] | 516 | return err; |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 517 | } |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 518 | |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 519 | static void netlink_frame_flush_dcache(const struct nl_mmap_hdr *hdr, unsigned int nm_len) |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 520 | { |
| 521 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
| 522 | struct page *p_start, *p_end; |
| 523 | |
| 524 | /* First page is flushed through netlink_{get,set}_status */ |
| 525 | p_start = pgvec_to_page(hdr + PAGE_SIZE); |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 526 | p_end = pgvec_to_page((void *)hdr + NL_MMAP_HDRLEN + nm_len - 1); |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 527 | while (p_start <= p_end) { |
| 528 | flush_dcache_page(p_start); |
| 529 | p_start++; |
| 530 | } |
| 531 | #endif |
| 532 | } |
| 533 | |
| 534 | static enum nl_mmap_status netlink_get_status(const struct nl_mmap_hdr *hdr) |
| 535 | { |
| 536 | smp_rmb(); |
| 537 | flush_dcache_page(pgvec_to_page(hdr)); |
| 538 | return hdr->nm_status; |
| 539 | } |
| 540 | |
| 541 | static void netlink_set_status(struct nl_mmap_hdr *hdr, |
| 542 | enum nl_mmap_status status) |
| 543 | { |
Thomas Graf | a18e6a1 | 2014-12-18 10:30:26 +0000 | [diff] [blame] | 544 | smp_mb(); |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 545 | hdr->nm_status = status; |
| 546 | flush_dcache_page(pgvec_to_page(hdr)); |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 547 | } |
| 548 | |
| 549 | static struct nl_mmap_hdr * |
| 550 | __netlink_lookup_frame(const struct netlink_ring *ring, unsigned int pos) |
| 551 | { |
| 552 | unsigned int pg_vec_pos, frame_off; |
| 553 | |
| 554 | pg_vec_pos = pos / ring->frames_per_block; |
| 555 | frame_off = pos % ring->frames_per_block; |
| 556 | |
| 557 | return ring->pg_vec[pg_vec_pos] + (frame_off * ring->frame_size); |
| 558 | } |
| 559 | |
| 560 | static struct nl_mmap_hdr * |
| 561 | netlink_lookup_frame(const struct netlink_ring *ring, unsigned int pos, |
| 562 | enum nl_mmap_status status) |
| 563 | { |
| 564 | struct nl_mmap_hdr *hdr; |
| 565 | |
| 566 | hdr = __netlink_lookup_frame(ring, pos); |
| 567 | if (netlink_get_status(hdr) != status) |
| 568 | return NULL; |
| 569 | |
| 570 | return hdr; |
| 571 | } |
| 572 | |
| 573 | static struct nl_mmap_hdr * |
| 574 | netlink_current_frame(const struct netlink_ring *ring, |
| 575 | enum nl_mmap_status status) |
| 576 | { |
| 577 | return netlink_lookup_frame(ring, ring->head, status); |
| 578 | } |
| 579 | |
| 580 | static struct nl_mmap_hdr * |
| 581 | netlink_previous_frame(const struct netlink_ring *ring, |
| 582 | enum nl_mmap_status status) |
| 583 | { |
| 584 | unsigned int prev; |
| 585 | |
| 586 | prev = ring->head ? ring->head - 1 : ring->frame_max; |
| 587 | return netlink_lookup_frame(ring, prev, status); |
| 588 | } |
| 589 | |
| 590 | static void netlink_increment_head(struct netlink_ring *ring) |
| 591 | { |
| 592 | ring->head = ring->head != ring->frame_max ? ring->head + 1 : 0; |
| 593 | } |
| 594 | |
| 595 | static void netlink_forward_ring(struct netlink_ring *ring) |
| 596 | { |
| 597 | unsigned int head = ring->head, pos = head; |
| 598 | const struct nl_mmap_hdr *hdr; |
| 599 | |
| 600 | do { |
| 601 | hdr = __netlink_lookup_frame(ring, pos); |
| 602 | if (hdr->nm_status == NL_MMAP_STATUS_UNUSED) |
| 603 | break; |
| 604 | if (hdr->nm_status != NL_MMAP_STATUS_SKIP) |
| 605 | break; |
| 606 | netlink_increment_head(ring); |
| 607 | } while (ring->head != head); |
| 608 | } |
| 609 | |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 610 | static bool netlink_dump_space(struct netlink_sock *nlk) |
| 611 | { |
| 612 | struct netlink_ring *ring = &nlk->rx_ring; |
| 613 | struct nl_mmap_hdr *hdr; |
| 614 | unsigned int n; |
| 615 | |
| 616 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED); |
| 617 | if (hdr == NULL) |
| 618 | return false; |
| 619 | |
| 620 | n = ring->head + ring->frame_max / 2; |
| 621 | if (n > ring->frame_max) |
| 622 | n -= ring->frame_max; |
| 623 | |
| 624 | hdr = __netlink_lookup_frame(ring, n); |
| 625 | |
| 626 | return hdr->nm_status == NL_MMAP_STATUS_UNUSED; |
| 627 | } |
| 628 | |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 629 | static unsigned int netlink_poll(struct file *file, struct socket *sock, |
| 630 | poll_table *wait) |
| 631 | { |
| 632 | struct sock *sk = sock->sk; |
| 633 | struct netlink_sock *nlk = nlk_sk(sk); |
| 634 | unsigned int mask; |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 635 | int err; |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 636 | |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 637 | if (nlk->rx_ring.pg_vec != NULL) { |
| 638 | /* Memory mapped sockets don't call recvmsg(), so flow control |
| 639 | * for dumps is performed here. A dump is allowed to continue |
| 640 | * if at least half the ring is unused. |
| 641 | */ |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 642 | while (nlk->cb_running && netlink_dump_space(nlk)) { |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 643 | err = netlink_dump(sk); |
| 644 | if (err < 0) { |
Ben Pfaff | ac30ef8 | 2014-07-09 10:31:22 -0700 | [diff] [blame] | 645 | sk->sk_err = -err; |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 646 | sk->sk_error_report(sk); |
| 647 | break; |
| 648 | } |
| 649 | } |
| 650 | netlink_rcv_wake(sk); |
| 651 | } |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 652 | |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 653 | mask = datagram_poll(file, sock, wait); |
| 654 | |
| 655 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 656 | if (nlk->rx_ring.pg_vec) { |
| 657 | netlink_forward_ring(&nlk->rx_ring); |
| 658 | if (!netlink_previous_frame(&nlk->rx_ring, NL_MMAP_STATUS_UNUSED)) |
| 659 | mask |= POLLIN | POLLRDNORM; |
| 660 | } |
| 661 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 662 | |
| 663 | spin_lock_bh(&sk->sk_write_queue.lock); |
| 664 | if (nlk->tx_ring.pg_vec) { |
| 665 | if (netlink_current_frame(&nlk->tx_ring, NL_MMAP_STATUS_UNUSED)) |
| 666 | mask |= POLLOUT | POLLWRNORM; |
| 667 | } |
| 668 | spin_unlock_bh(&sk->sk_write_queue.lock); |
| 669 | |
| 670 | return mask; |
| 671 | } |
| 672 | |
| 673 | static struct nl_mmap_hdr *netlink_mmap_hdr(struct sk_buff *skb) |
| 674 | { |
| 675 | return (struct nl_mmap_hdr *)(skb->head - NL_MMAP_HDRLEN); |
| 676 | } |
| 677 | |
| 678 | static void netlink_ring_setup_skb(struct sk_buff *skb, struct sock *sk, |
| 679 | struct netlink_ring *ring, |
| 680 | struct nl_mmap_hdr *hdr) |
| 681 | { |
| 682 | unsigned int size; |
| 683 | void *data; |
| 684 | |
| 685 | size = ring->frame_size - NL_MMAP_HDRLEN; |
| 686 | data = (void *)hdr + NL_MMAP_HDRLEN; |
| 687 | |
| 688 | skb->head = data; |
| 689 | skb->data = data; |
| 690 | skb_reset_tail_pointer(skb); |
| 691 | skb->end = skb->tail + size; |
| 692 | skb->len = 0; |
| 693 | |
| 694 | skb->destructor = netlink_skb_destructor; |
| 695 | NETLINK_CB(skb).flags |= NETLINK_SKB_MMAPED; |
| 696 | NETLINK_CB(skb).sk = sk; |
| 697 | } |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 698 | |
| 699 | static int netlink_mmap_sendmsg(struct sock *sk, struct msghdr *msg, |
| 700 | u32 dst_portid, u32 dst_group, |
| 701 | struct sock_iocb *siocb) |
| 702 | { |
| 703 | struct netlink_sock *nlk = nlk_sk(sk); |
| 704 | struct netlink_ring *ring; |
| 705 | struct nl_mmap_hdr *hdr; |
| 706 | struct sk_buff *skb; |
| 707 | unsigned int maxlen; |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 708 | int err = 0, len = 0; |
| 709 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 710 | mutex_lock(&nlk->pg_vec_lock); |
| 711 | |
| 712 | ring = &nlk->tx_ring; |
| 713 | maxlen = ring->frame_size - NL_MMAP_HDRLEN; |
| 714 | |
| 715 | do { |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 716 | unsigned int nm_len; |
| 717 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 718 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_VALID); |
| 719 | if (hdr == NULL) { |
| 720 | if (!(msg->msg_flags & MSG_DONTWAIT) && |
| 721 | atomic_read(&nlk->tx_ring.pending)) |
| 722 | schedule(); |
| 723 | continue; |
| 724 | } |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 725 | |
| 726 | nm_len = ACCESS_ONCE(hdr->nm_len); |
| 727 | if (nm_len > maxlen) { |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 728 | err = -EINVAL; |
| 729 | goto out; |
| 730 | } |
| 731 | |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 732 | netlink_frame_flush_dcache(hdr, nm_len); |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 733 | |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 734 | skb = alloc_skb(nm_len, GFP_KERNEL); |
| 735 | if (skb == NULL) { |
| 736 | err = -ENOBUFS; |
| 737 | goto out; |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 738 | } |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 739 | __skb_put(skb, nm_len); |
| 740 | memcpy(skb->data, (void *)hdr + NL_MMAP_HDRLEN, nm_len); |
| 741 | netlink_set_status(hdr, NL_MMAP_STATUS_UNUSED); |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 742 | |
| 743 | netlink_increment_head(ring); |
| 744 | |
| 745 | NETLINK_CB(skb).portid = nlk->portid; |
| 746 | NETLINK_CB(skb).dst_group = dst_group; |
| 747 | NETLINK_CB(skb).creds = siocb->scm->creds; |
| 748 | |
| 749 | err = security_netlink_send(sk, skb); |
| 750 | if (err) { |
| 751 | kfree_skb(skb); |
| 752 | goto out; |
| 753 | } |
| 754 | |
| 755 | if (unlikely(dst_group)) { |
| 756 | atomic_inc(&skb->users); |
| 757 | netlink_broadcast(sk, skb, dst_portid, dst_group, |
| 758 | GFP_KERNEL); |
| 759 | } |
| 760 | err = netlink_unicast(sk, skb, dst_portid, |
| 761 | msg->msg_flags & MSG_DONTWAIT); |
| 762 | if (err < 0) |
| 763 | goto out; |
| 764 | len += err; |
| 765 | |
| 766 | } while (hdr != NULL || |
| 767 | (!(msg->msg_flags & MSG_DONTWAIT) && |
| 768 | atomic_read(&nlk->tx_ring.pending))); |
| 769 | |
| 770 | if (len > 0) |
| 771 | err = len; |
| 772 | out: |
| 773 | mutex_unlock(&nlk->pg_vec_lock); |
| 774 | return err; |
| 775 | } |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 776 | |
| 777 | static void netlink_queue_mmaped_skb(struct sock *sk, struct sk_buff *skb) |
| 778 | { |
| 779 | struct nl_mmap_hdr *hdr; |
| 780 | |
| 781 | hdr = netlink_mmap_hdr(skb); |
| 782 | hdr->nm_len = skb->len; |
| 783 | hdr->nm_group = NETLINK_CB(skb).dst_group; |
| 784 | hdr->nm_pid = NETLINK_CB(skb).creds.pid; |
Nicolas Dichtel | 1bf9310 | 2013-04-24 10:36:23 +0200 | [diff] [blame] | 785 | hdr->nm_uid = from_kuid(sk_user_ns(sk), NETLINK_CB(skb).creds.uid); |
| 786 | hdr->nm_gid = from_kgid(sk_user_ns(sk), NETLINK_CB(skb).creds.gid); |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 787 | netlink_frame_flush_dcache(hdr, hdr->nm_len); |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 788 | netlink_set_status(hdr, NL_MMAP_STATUS_VALID); |
| 789 | |
| 790 | NETLINK_CB(skb).flags |= NETLINK_SKB_DELIVERED; |
| 791 | kfree_skb(skb); |
| 792 | } |
| 793 | |
| 794 | static void netlink_ring_set_copied(struct sock *sk, struct sk_buff *skb) |
| 795 | { |
| 796 | struct netlink_sock *nlk = nlk_sk(sk); |
| 797 | struct netlink_ring *ring = &nlk->rx_ring; |
| 798 | struct nl_mmap_hdr *hdr; |
| 799 | |
| 800 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 801 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED); |
| 802 | if (hdr == NULL) { |
| 803 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 804 | kfree_skb(skb); |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 805 | netlink_overrun(sk); |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 806 | return; |
| 807 | } |
| 808 | netlink_increment_head(ring); |
| 809 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
| 810 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 811 | |
| 812 | hdr->nm_len = skb->len; |
| 813 | hdr->nm_group = NETLINK_CB(skb).dst_group; |
| 814 | hdr->nm_pid = NETLINK_CB(skb).creds.pid; |
Nicolas Dichtel | 1bf9310 | 2013-04-24 10:36:23 +0200 | [diff] [blame] | 815 | hdr->nm_uid = from_kuid(sk_user_ns(sk), NETLINK_CB(skb).creds.uid); |
| 816 | hdr->nm_gid = from_kgid(sk_user_ns(sk), NETLINK_CB(skb).creds.gid); |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 817 | netlink_set_status(hdr, NL_MMAP_STATUS_COPY); |
| 818 | } |
| 819 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 820 | #else /* CONFIG_NETLINK_MMAP */ |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 821 | #define netlink_skb_is_mmaped(skb) false |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 822 | #define netlink_rx_is_mmaped(sk) false |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 823 | #define netlink_tx_is_mmaped(sk) false |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 824 | #define netlink_mmap sock_no_mmap |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 825 | #define netlink_poll datagram_poll |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 826 | #define netlink_mmap_sendmsg(sk, msg, dst_portid, dst_group, siocb) 0 |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 827 | #endif /* CONFIG_NETLINK_MMAP */ |
| 828 | |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 829 | static void netlink_skb_destructor(struct sk_buff *skb) |
| 830 | { |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 831 | #ifdef CONFIG_NETLINK_MMAP |
| 832 | struct nl_mmap_hdr *hdr; |
| 833 | struct netlink_ring *ring; |
| 834 | struct sock *sk; |
| 835 | |
| 836 | /* If a packet from the kernel to userspace was freed because of an |
| 837 | * error without being delivered to userspace, the kernel must reset |
| 838 | * the status. In the direction userspace to kernel, the status is |
| 839 | * always reset here after the packet was processed and freed. |
| 840 | */ |
| 841 | if (netlink_skb_is_mmaped(skb)) { |
| 842 | hdr = netlink_mmap_hdr(skb); |
| 843 | sk = NETLINK_CB(skb).sk; |
| 844 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 845 | if (NETLINK_CB(skb).flags & NETLINK_SKB_TX) { |
| 846 | netlink_set_status(hdr, NL_MMAP_STATUS_UNUSED); |
| 847 | ring = &nlk_sk(sk)->tx_ring; |
| 848 | } else { |
| 849 | if (!(NETLINK_CB(skb).flags & NETLINK_SKB_DELIVERED)) { |
| 850 | hdr->nm_len = 0; |
| 851 | netlink_set_status(hdr, NL_MMAP_STATUS_VALID); |
| 852 | } |
| 853 | ring = &nlk_sk(sk)->rx_ring; |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 854 | } |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 855 | |
| 856 | WARN_ON(atomic_read(&ring->pending) == 0); |
| 857 | atomic_dec(&ring->pending); |
| 858 | sock_put(sk); |
| 859 | |
Pablo Neira | 5e71d9d | 2013-06-03 09:28:43 +0000 | [diff] [blame] | 860 | skb->head = NULL; |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 861 | } |
| 862 | #endif |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 863 | if (is_vmalloc_addr(skb->head)) { |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 864 | if (!skb->cloned || |
| 865 | !atomic_dec_return(&(skb_shinfo(skb)->dataref))) |
| 866 | vfree(skb->head); |
| 867 | |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 868 | skb->head = NULL; |
| 869 | } |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 870 | if (skb->sk != NULL) |
| 871 | sock_rfree(skb); |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 872 | } |
| 873 | |
| 874 | static void netlink_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
| 875 | { |
| 876 | WARN_ON(skb->sk != NULL); |
| 877 | skb->sk = sk; |
| 878 | skb->destructor = netlink_skb_destructor; |
| 879 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); |
| 880 | sk_mem_charge(sk, skb->truesize); |
| 881 | } |
| 882 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | static void netlink_sock_destruct(struct sock *sk) |
| 884 | { |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 885 | struct netlink_sock *nlk = nlk_sk(sk); |
| 886 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 887 | if (nlk->cb_running) { |
| 888 | if (nlk->cb.done) |
| 889 | nlk->cb.done(&nlk->cb); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 890 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 891 | module_put(nlk->cb.module); |
| 892 | kfree_skb(nlk->cb.skb); |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 893 | } |
| 894 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 895 | skb_queue_purge(&sk->sk_receive_queue); |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 896 | #ifdef CONFIG_NETLINK_MMAP |
| 897 | if (1) { |
| 898 | struct nl_mmap_req req; |
| 899 | |
| 900 | memset(&req, 0, sizeof(req)); |
| 901 | if (nlk->rx_ring.pg_vec) |
| 902 | netlink_set_ring(sk, &req, true, false); |
| 903 | memset(&req, 0, sizeof(req)); |
| 904 | if (nlk->tx_ring.pg_vec) |
| 905 | netlink_set_ring(sk, &req, true, true); |
| 906 | } |
| 907 | #endif /* CONFIG_NETLINK_MMAP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
| 909 | if (!sock_flag(sk, SOCK_DEAD)) { |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 910 | printk(KERN_ERR "Freeing alive netlink socket %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | return; |
| 912 | } |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 913 | |
| 914 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| 915 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
| 916 | WARN_ON(nlk_sk(sk)->groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | } |
| 918 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 919 | /* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on |
| 920 | * 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] | 921 | * immediately hit write lock and grab all the cpus. Exclusive sleep solves |
| 922 | * this, _but_ remember, it adds useless work on UP machines. |
| 923 | */ |
| 924 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 925 | void netlink_table_grab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 926 | __acquires(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | { |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 928 | might_sleep(); |
| 929 | |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 930 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | |
| 932 | if (atomic_read(&nl_table_users)) { |
| 933 | DECLARE_WAITQUEUE(wait, current); |
| 934 | |
| 935 | add_wait_queue_exclusive(&nl_table_wait, &wait); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 936 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 938 | if (atomic_read(&nl_table_users) == 0) |
| 939 | break; |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 940 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | schedule(); |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 942 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | } |
| 944 | |
| 945 | __set_current_state(TASK_RUNNING); |
| 946 | remove_wait_queue(&nl_table_wait, &wait); |
| 947 | } |
| 948 | } |
| 949 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 950 | void netlink_table_ungrab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 951 | __releases(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | { |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 953 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | wake_up(&nl_table_wait); |
| 955 | } |
| 956 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 957 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | netlink_lock_table(void) |
| 959 | { |
| 960 | /* read_lock() synchronizes us to netlink_table_grab */ |
| 961 | |
| 962 | read_lock(&nl_table_lock); |
| 963 | atomic_inc(&nl_table_users); |
| 964 | read_unlock(&nl_table_lock); |
| 965 | } |
| 966 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 967 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | netlink_unlock_table(void) |
| 969 | { |
| 970 | if (atomic_dec_and_test(&nl_table_users)) |
| 971 | wake_up(&nl_table_wait); |
| 972 | } |
| 973 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 974 | struct netlink_compare_arg |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 975 | { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 976 | struct net *net; |
| 977 | u32 portid; |
| 978 | }; |
| 979 | |
| 980 | static bool netlink_compare(void *ptr, void *arg) |
| 981 | { |
| 982 | struct netlink_compare_arg *x = arg; |
| 983 | struct sock *sk = ptr; |
| 984 | |
| 985 | return nlk_sk(sk)->portid == x->portid && |
| 986 | net_eq(sock_net(sk), x->net); |
| 987 | } |
| 988 | |
| 989 | static struct sock *__netlink_lookup(struct netlink_table *table, u32 portid, |
| 990 | struct net *net) |
| 991 | { |
| 992 | struct netlink_compare_arg arg = { |
| 993 | .net = net, |
| 994 | .portid = portid, |
| 995 | }; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 996 | |
Thomas Graf | 8d24c0b | 2015-01-02 23:00:14 +0100 | [diff] [blame] | 997 | return rhashtable_lookup_compare(&table->hash, &portid, |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 998 | &netlink_compare, &arg); |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 999 | } |
| 1000 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1001 | static struct sock *netlink_lookup(struct net *net, int protocol, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | { |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1003 | struct netlink_table *table = &nl_table[protocol]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 1006 | read_lock(&nl_table_lock); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1007 | rcu_read_lock(); |
| 1008 | sk = __netlink_lookup(table, portid, net); |
| 1009 | if (sk) |
| 1010 | sock_hold(sk); |
| 1011 | rcu_read_unlock(); |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 1012 | read_unlock(&nl_table_lock); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | return sk; |
| 1015 | } |
| 1016 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1017 | static const struct proto_ops netlink_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1019 | static void |
| 1020 | netlink_update_listeners(struct sock *sk) |
| 1021 | { |
| 1022 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1023 | unsigned long mask; |
| 1024 | unsigned int i; |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1025 | struct listeners *listeners; |
| 1026 | |
| 1027 | listeners = nl_deref_protected(tbl->listeners); |
| 1028 | if (!listeners) |
| 1029 | return; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1030 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1031 | for (i = 0; i < NLGRPLONGS(tbl->groups); i++) { |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1032 | mask = 0; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1033 | sk_for_each_bound(sk, &tbl->mc_list) { |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1034 | if (i < NLGRPLONGS(nlk_sk(sk)->ngroups)) |
| 1035 | mask |= nlk_sk(sk)->groups[i]; |
| 1036 | } |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1037 | listeners->masks[i] = mask; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1038 | } |
| 1039 | /* this function is only called with the netlink table "grabbed", which |
| 1040 | * makes sure updates are visible before bind or setsockopt return. */ |
| 1041 | } |
| 1042 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1043 | static int netlink_insert(struct sock *sk, struct net *net, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | { |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1045 | struct netlink_table *table = &nl_table[sk->sk_protocol]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | int err = -EADDRINUSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1048 | mutex_lock(&nl_sk_hash_lock); |
| 1049 | if (__netlink_lookup(table, portid, net)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1050 | goto err; |
| 1051 | |
| 1052 | err = -EBUSY; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1053 | if (nlk_sk(sk)->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | goto err; |
| 1055 | |
| 1056 | err = -ENOMEM; |
Thomas Graf | 97defe1 | 2015-01-02 23:00:20 +0100 | [diff] [blame^] | 1057 | if (BITS_PER_LONG > 32 && |
| 1058 | unlikely(atomic_read(&table->hash.nelems) >= UINT_MAX)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1059 | goto err; |
| 1060 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1061 | nlk_sk(sk)->portid = portid; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1062 | sock_hold(sk); |
Thomas Graf | 6eba822 | 2014-11-13 13:45:46 +0100 | [diff] [blame] | 1063 | rhashtable_insert(&table->hash, &nlk_sk(sk)->node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | err: |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1066 | mutex_unlock(&nl_sk_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | return err; |
| 1068 | } |
| 1069 | |
| 1070 | static void netlink_remove(struct sock *sk) |
| 1071 | { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1072 | struct netlink_table *table; |
| 1073 | |
| 1074 | mutex_lock(&nl_sk_hash_lock); |
| 1075 | table = &nl_table[sk->sk_protocol]; |
Thomas Graf | 6eba822 | 2014-11-13 13:45:46 +0100 | [diff] [blame] | 1076 | if (rhashtable_remove(&table->hash, &nlk_sk(sk)->node)) { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1077 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); |
| 1078 | __sock_put(sk); |
| 1079 | } |
| 1080 | mutex_unlock(&nl_sk_hash_lock); |
| 1081 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | netlink_table_grab(); |
Johannes Berg | b10dcb3 | 2014-12-22 18:56:37 +0100 | [diff] [blame] | 1083 | if (nlk_sk(sk)->subscriptions) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1084 | __sk_del_bind_node(sk); |
Johannes Berg | b10dcb3 | 2014-12-22 18:56:37 +0100 | [diff] [blame] | 1085 | netlink_update_listeners(sk); |
| 1086 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | netlink_table_ungrab(); |
| 1088 | } |
| 1089 | |
| 1090 | static struct proto netlink_proto = { |
| 1091 | .name = "NETLINK", |
| 1092 | .owner = THIS_MODULE, |
| 1093 | .obj_size = sizeof(struct netlink_sock), |
| 1094 | }; |
| 1095 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 1096 | static int __netlink_create(struct net *net, struct socket *sock, |
| 1097 | struct mutex *cb_mutex, int protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | { |
| 1099 | struct sock *sk; |
| 1100 | struct netlink_sock *nlk; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1101 | |
| 1102 | sock->ops = &netlink_ops; |
| 1103 | |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 1104 | sk = sk_alloc(net, PF_NETLINK, GFP_KERNEL, &netlink_proto); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1105 | if (!sk) |
| 1106 | return -ENOMEM; |
| 1107 | |
| 1108 | sock_init_data(sock, sk); |
| 1109 | |
| 1110 | nlk = nlk_sk(sk); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1111 | if (cb_mutex) { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 1112 | nlk->cb_mutex = cb_mutex; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1113 | } else { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 1114 | nlk->cb_mutex = &nlk->cb_def_mutex; |
| 1115 | mutex_init(nlk->cb_mutex); |
| 1116 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1117 | init_waitqueue_head(&nlk->wait); |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 1118 | #ifdef CONFIG_NETLINK_MMAP |
| 1119 | mutex_init(&nlk->pg_vec_lock); |
| 1120 | #endif |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1121 | |
| 1122 | sk->sk_destruct = netlink_sock_destruct; |
| 1123 | sk->sk_protocol = protocol; |
| 1124 | return 0; |
| 1125 | } |
| 1126 | |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 1127 | static int netlink_create(struct net *net, struct socket *sock, int protocol, |
| 1128 | int kern) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1129 | { |
| 1130 | struct module *module = NULL; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1131 | struct mutex *cb_mutex; |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1132 | struct netlink_sock *nlk; |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1133 | int (*bind)(struct net *net, int group); |
| 1134 | void (*unbind)(struct net *net, int group); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1135 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | |
| 1137 | sock->state = SS_UNCONNECTED; |
| 1138 | |
| 1139 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) |
| 1140 | return -ESOCKTNOSUPPORT; |
| 1141 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1142 | if (protocol < 0 || protocol >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1143 | return -EPROTONOSUPPORT; |
| 1144 | |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1145 | netlink_lock_table(); |
Johannes Berg | 95a5afc | 2008-10-16 15:24:51 -0700 | [diff] [blame] | 1146 | #ifdef CONFIG_MODULES |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1147 | if (!nl_table[protocol].registered) { |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1148 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1149 | request_module("net-pf-%d-proto-%d", PF_NETLINK, protocol); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1150 | netlink_lock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1151 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1152 | #endif |
| 1153 | if (nl_table[protocol].registered && |
| 1154 | try_module_get(nl_table[protocol].module)) |
| 1155 | module = nl_table[protocol].module; |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 1156 | else |
| 1157 | err = -EPROTONOSUPPORT; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1158 | cb_mutex = nl_table[protocol].cb_mutex; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 1159 | bind = nl_table[protocol].bind; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1160 | unbind = nl_table[protocol].unbind; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1161 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1162 | |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 1163 | if (err < 0) |
| 1164 | goto out; |
| 1165 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1166 | err = __netlink_create(net, sock, cb_mutex, protocol); |
| 1167 | if (err < 0) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1168 | goto out_module; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 1170 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 1171 | sock_prot_inuse_add(net, &netlink_proto, 1); |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 1172 | local_bh_enable(); |
| 1173 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1174 | nlk = nlk_sk(sock->sk); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1175 | nlk->module = module; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 1176 | nlk->netlink_bind = bind; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1177 | nlk->netlink_unbind = unbind; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1178 | out: |
| 1179 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1180 | |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1181 | out_module: |
| 1182 | module_put(module); |
| 1183 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | } |
| 1185 | |
| 1186 | static int netlink_release(struct socket *sock) |
| 1187 | { |
| 1188 | struct sock *sk = sock->sk; |
| 1189 | struct netlink_sock *nlk; |
| 1190 | |
| 1191 | if (!sk) |
| 1192 | return 0; |
| 1193 | |
| 1194 | netlink_remove(sk); |
Denis Lunev | ac57b3a | 2007-04-18 17:05:58 -0700 | [diff] [blame] | 1195 | sock_orphan(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | nlk = nlk_sk(sk); |
| 1197 | |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 1198 | /* |
| 1199 | * OK. Socket is unlinked, any packets that arrive now |
| 1200 | * will be purged. |
| 1201 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | sock->sk = NULL; |
| 1204 | wake_up_interruptible_all(&nlk->wait); |
| 1205 | |
| 1206 | skb_queue_purge(&sk->sk_write_queue); |
| 1207 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1208 | if (nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1209 | struct netlink_notify n = { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1210 | .net = sock_net(sk), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1211 | .protocol = sk->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1212 | .portid = nlk->portid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | }; |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1214 | atomic_notifier_call_chain(&netlink_chain, |
| 1215 | NETLINK_URELEASE, &n); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1216 | } |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1217 | |
Mariusz Kozlowski | 5e7c001 | 2007-01-02 15:24:30 -0800 | [diff] [blame] | 1218 | module_put(nlk->module); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1219 | |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 1220 | if (netlink_is_kernel(sk)) { |
Johannes Berg | b10dcb3 | 2014-12-22 18:56:37 +0100 | [diff] [blame] | 1221 | netlink_table_grab(); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1222 | BUG_ON(nl_table[sk->sk_protocol].registered == 0); |
| 1223 | if (--nl_table[sk->sk_protocol].registered == 0) { |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1224 | struct listeners *old; |
| 1225 | |
| 1226 | old = nl_deref_protected(nl_table[sk->sk_protocol].listeners); |
| 1227 | RCU_INIT_POINTER(nl_table[sk->sk_protocol].listeners, NULL); |
| 1228 | kfree_rcu(old, rcu); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1229 | nl_table[sk->sk_protocol].module = NULL; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1230 | nl_table[sk->sk_protocol].bind = NULL; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1231 | nl_table[sk->sk_protocol].unbind = NULL; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1232 | nl_table[sk->sk_protocol].flags = 0; |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1233 | nl_table[sk->sk_protocol].registered = 0; |
| 1234 | } |
Johannes Berg | b10dcb3 | 2014-12-22 18:56:37 +0100 | [diff] [blame] | 1235 | netlink_table_ungrab(); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1236 | } |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1237 | |
Johannes Berg | 7d68536 | 2014-12-22 18:56:38 +0100 | [diff] [blame] | 1238 | if (nlk->netlink_unbind) { |
| 1239 | int i; |
| 1240 | |
| 1241 | for (i = 0; i < nlk->ngroups; i++) |
| 1242 | if (test_bit(i, nlk->groups)) |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1243 | nlk->netlink_unbind(sock_net(sk), i + 1); |
Johannes Berg | 7d68536 | 2014-12-22 18:56:38 +0100 | [diff] [blame] | 1244 | } |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1245 | kfree(nlk->groups); |
| 1246 | nlk->groups = NULL; |
| 1247 | |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 1248 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 1249 | sock_prot_inuse_add(sock_net(sk), &netlink_proto, -1); |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 1250 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1251 | sock_put(sk); |
| 1252 | return 0; |
| 1253 | } |
| 1254 | |
| 1255 | static int netlink_autobind(struct socket *sock) |
| 1256 | { |
| 1257 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1258 | struct net *net = sock_net(sk); |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1259 | struct netlink_table *table = &nl_table[sk->sk_protocol]; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1260 | s32 portid = task_tgid_vnr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | int err; |
| 1262 | static s32 rover = -4097; |
| 1263 | |
| 1264 | retry: |
| 1265 | cond_resched(); |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 1266 | netlink_table_grab(); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1267 | rcu_read_lock(); |
| 1268 | if (__netlink_lookup(table, portid, net)) { |
| 1269 | /* Bind collision, search negative portid values. */ |
| 1270 | portid = rover--; |
| 1271 | if (rover > -4097) |
| 1272 | rover = -4097; |
| 1273 | rcu_read_unlock(); |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 1274 | netlink_table_ungrab(); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1275 | goto retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1276 | } |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1277 | rcu_read_unlock(); |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 1278 | netlink_table_ungrab(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1280 | err = netlink_insert(sk, net, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | if (err == -EADDRINUSE) |
| 1282 | goto retry; |
David S. Miller | d470e3b | 2005-06-26 15:31:51 -0700 | [diff] [blame] | 1283 | |
| 1284 | /* If 2 threads race to autobind, that is fine. */ |
| 1285 | if (err == -EBUSY) |
| 1286 | err = 0; |
| 1287 | |
| 1288 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | } |
| 1290 | |
Eric W. Biederman | aa4cf94 | 2014-04-23 14:28:03 -0700 | [diff] [blame] | 1291 | /** |
| 1292 | * __netlink_ns_capable - General netlink message capability test |
| 1293 | * @nsp: NETLINK_CB of the socket buffer holding a netlink command from userspace. |
| 1294 | * @user_ns: The user namespace of the capability to use |
| 1295 | * @cap: The capability to use |
| 1296 | * |
| 1297 | * Test to see if the opener of the socket we received the message |
| 1298 | * from had when the netlink socket was created and the sender of the |
| 1299 | * message has has the capability @cap in the user namespace @user_ns. |
| 1300 | */ |
| 1301 | bool __netlink_ns_capable(const struct netlink_skb_parms *nsp, |
| 1302 | struct user_namespace *user_ns, int cap) |
| 1303 | { |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 1304 | return ((nsp->flags & NETLINK_SKB_DST) || |
| 1305 | file_ns_capable(nsp->sk->sk_socket->file, user_ns, cap)) && |
| 1306 | ns_capable(user_ns, cap); |
Eric W. Biederman | aa4cf94 | 2014-04-23 14:28:03 -0700 | [diff] [blame] | 1307 | } |
| 1308 | EXPORT_SYMBOL(__netlink_ns_capable); |
| 1309 | |
| 1310 | /** |
| 1311 | * netlink_ns_capable - General netlink message capability test |
| 1312 | * @skb: socket buffer holding a netlink command from userspace |
| 1313 | * @user_ns: The user namespace of the capability to use |
| 1314 | * @cap: The capability to use |
| 1315 | * |
| 1316 | * Test to see if the opener of the socket we received the message |
| 1317 | * from had when the netlink socket was created and the sender of the |
| 1318 | * message has has the capability @cap in the user namespace @user_ns. |
| 1319 | */ |
| 1320 | bool netlink_ns_capable(const struct sk_buff *skb, |
| 1321 | struct user_namespace *user_ns, int cap) |
| 1322 | { |
| 1323 | return __netlink_ns_capable(&NETLINK_CB(skb), user_ns, cap); |
| 1324 | } |
| 1325 | EXPORT_SYMBOL(netlink_ns_capable); |
| 1326 | |
| 1327 | /** |
| 1328 | * netlink_capable - Netlink global message capability test |
| 1329 | * @skb: socket buffer holding a netlink command from userspace |
| 1330 | * @cap: The capability to use |
| 1331 | * |
| 1332 | * Test to see if the opener of the socket we received the message |
| 1333 | * from had when the netlink socket was created and the sender of the |
| 1334 | * message has has the capability @cap in all user namespaces. |
| 1335 | */ |
| 1336 | bool netlink_capable(const struct sk_buff *skb, int cap) |
| 1337 | { |
| 1338 | return netlink_ns_capable(skb, &init_user_ns, cap); |
| 1339 | } |
| 1340 | EXPORT_SYMBOL(netlink_capable); |
| 1341 | |
| 1342 | /** |
| 1343 | * netlink_net_capable - Netlink network namespace message capability test |
| 1344 | * @skb: socket buffer holding a netlink command from userspace |
| 1345 | * @cap: The capability to use |
| 1346 | * |
| 1347 | * Test to see if the opener of the socket we received the message |
| 1348 | * from had when the netlink socket was created and the sender of the |
| 1349 | * message has has the capability @cap over the network namespace of |
| 1350 | * the socket we received the message from. |
| 1351 | */ |
| 1352 | bool netlink_net_capable(const struct sk_buff *skb, int cap) |
| 1353 | { |
| 1354 | return netlink_ns_capable(skb, sock_net(skb->sk)->user_ns, cap); |
| 1355 | } |
| 1356 | EXPORT_SYMBOL(netlink_net_capable); |
| 1357 | |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 1358 | static inline int netlink_allowed(const struct socket *sock, unsigned int flag) |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1359 | { |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1360 | return (nl_table[sock->sk->sk_protocol].flags & flag) || |
Eric W. Biederman | df008c9 | 2012-11-16 03:03:07 +0000 | [diff] [blame] | 1361 | ns_capable(sock_net(sock->sk)->user_ns, CAP_NET_ADMIN); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1362 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1364 | static void |
| 1365 | netlink_update_subscriptions(struct sock *sk, unsigned int subscriptions) |
| 1366 | { |
| 1367 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1368 | |
| 1369 | if (nlk->subscriptions && !subscriptions) |
| 1370 | __sk_del_bind_node(sk); |
| 1371 | else if (!nlk->subscriptions && subscriptions) |
| 1372 | sk_add_bind_node(sk, &nl_table[sk->sk_protocol].mc_list); |
| 1373 | nlk->subscriptions = subscriptions; |
| 1374 | } |
| 1375 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1376 | static int netlink_realloc_groups(struct sock *sk) |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1377 | { |
| 1378 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1379 | unsigned int groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1380 | unsigned long *new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1381 | int err = 0; |
| 1382 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1383 | netlink_table_grab(); |
| 1384 | |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1385 | groups = nl_table[sk->sk_protocol].groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1386 | if (!nl_table[sk->sk_protocol].registered) { |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1387 | err = -ENOENT; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1388 | goto out_unlock; |
| 1389 | } |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1390 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1391 | if (nlk->ngroups >= groups) |
| 1392 | goto out_unlock; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1393 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1394 | new_groups = krealloc(nlk->groups, NLGRPSZ(groups), GFP_ATOMIC); |
| 1395 | if (new_groups == NULL) { |
| 1396 | err = -ENOMEM; |
| 1397 | goto out_unlock; |
| 1398 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1399 | memset((char *)new_groups + NLGRPSZ(nlk->ngroups), 0, |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1400 | NLGRPSZ(groups) - NLGRPSZ(nlk->ngroups)); |
| 1401 | |
| 1402 | nlk->groups = new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1403 | nlk->ngroups = groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1404 | out_unlock: |
| 1405 | netlink_table_ungrab(); |
| 1406 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1407 | } |
| 1408 | |
Johannes Berg | 02c81ab | 2014-12-22 18:56:35 +0100 | [diff] [blame] | 1409 | static void netlink_undo_bind(int group, long unsigned int groups, |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1410 | struct sock *sk) |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1411 | { |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1412 | struct netlink_sock *nlk = nlk_sk(sk); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1413 | int undo; |
| 1414 | |
| 1415 | if (!nlk->netlink_unbind) |
| 1416 | return; |
| 1417 | |
| 1418 | for (undo = 0; undo < group; undo++) |
Hiroaki SHIMODA | 6251edd | 2014-11-13 04:24:10 +0900 | [diff] [blame] | 1419 | if (test_bit(undo, &groups)) |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1420 | nlk->netlink_unbind(sock_net(sk), undo); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1421 | } |
| 1422 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1423 | static int netlink_bind(struct socket *sock, struct sockaddr *addr, |
| 1424 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1425 | { |
| 1426 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1427 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1429 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
| 1430 | int err; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1431 | long unsigned int groups = nladdr->nl_groups; |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1432 | |
Hannes Frederic Sowa | 4e4b537 | 2012-12-15 15:42:19 +0000 | [diff] [blame] | 1433 | if (addr_len < sizeof(struct sockaddr_nl)) |
| 1434 | return -EINVAL; |
| 1435 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1436 | if (nladdr->nl_family != AF_NETLINK) |
| 1437 | return -EINVAL; |
| 1438 | |
| 1439 | /* Only superuser is allowed to listen multicasts */ |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1440 | if (groups) { |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 1441 | if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV)) |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1442 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1443 | err = netlink_realloc_groups(sk); |
| 1444 | if (err) |
| 1445 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1446 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1447 | |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1448 | if (nlk->portid) |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1449 | if (nladdr->nl_pid != nlk->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1450 | return -EINVAL; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1451 | |
| 1452 | if (nlk->netlink_bind && groups) { |
| 1453 | int group; |
| 1454 | |
| 1455 | for (group = 0; group < nlk->ngroups; group++) { |
| 1456 | if (!test_bit(group, &groups)) |
| 1457 | continue; |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1458 | err = nlk->netlink_bind(net, group); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1459 | if (!err) |
| 1460 | continue; |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1461 | netlink_undo_bind(group, groups, sk); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1462 | return err; |
| 1463 | } |
| 1464 | } |
| 1465 | |
| 1466 | if (!nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | err = nladdr->nl_pid ? |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1468 | netlink_insert(sk, net, nladdr->nl_pid) : |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1469 | netlink_autobind(sock); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1470 | if (err) { |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1471 | netlink_undo_bind(nlk->ngroups, groups, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | return err; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1473 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1474 | } |
| 1475 | |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1476 | if (!groups && (nlk->groups == NULL || !(u32)nlk->groups[0])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1477 | return 0; |
| 1478 | |
| 1479 | netlink_table_grab(); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1480 | netlink_update_subscriptions(sk, nlk->subscriptions + |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1481 | hweight32(groups) - |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1482 | hweight32(nlk->groups[0])); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1483 | nlk->groups[0] = (nlk->groups[0] & ~0xffffffffUL) | groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1484 | netlink_update_listeners(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | netlink_table_ungrab(); |
| 1486 | |
| 1487 | return 0; |
| 1488 | } |
| 1489 | |
| 1490 | static int netlink_connect(struct socket *sock, struct sockaddr *addr, |
| 1491 | int alen, int flags) |
| 1492 | { |
| 1493 | int err = 0; |
| 1494 | struct sock *sk = sock->sk; |
| 1495 | struct netlink_sock *nlk = nlk_sk(sk); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1496 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | |
Changli Gao | 6503d96 | 2010-03-31 22:58:26 +0000 | [diff] [blame] | 1498 | if (alen < sizeof(addr->sa_family)) |
| 1499 | return -EINVAL; |
| 1500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | if (addr->sa_family == AF_UNSPEC) { |
| 1502 | sk->sk_state = NETLINK_UNCONNECTED; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1503 | nlk->dst_portid = 0; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1504 | nlk->dst_group = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1505 | return 0; |
| 1506 | } |
| 1507 | if (addr->sa_family != AF_NETLINK) |
| 1508 | return -EINVAL; |
| 1509 | |
Mike Pecovnik | 46833a8 | 2014-02-24 21:11:16 +0100 | [diff] [blame] | 1510 | if ((nladdr->nl_groups || nladdr->nl_pid) && |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 1511 | !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | return -EPERM; |
| 1513 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1514 | if (!nlk->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1515 | err = netlink_autobind(sock); |
| 1516 | |
| 1517 | if (err == 0) { |
| 1518 | sk->sk_state = NETLINK_CONNECTED; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1519 | nlk->dst_portid = nladdr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1520 | nlk->dst_group = ffs(nladdr->nl_groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1521 | } |
| 1522 | |
| 1523 | return err; |
| 1524 | } |
| 1525 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1526 | static int netlink_getname(struct socket *sock, struct sockaddr *addr, |
| 1527 | int *addr_len, int peer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | { |
| 1529 | struct sock *sk = sock->sk; |
| 1530 | struct netlink_sock *nlk = nlk_sk(sk); |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 1531 | DECLARE_SOCKADDR(struct sockaddr_nl *, nladdr, addr); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | nladdr->nl_family = AF_NETLINK; |
| 1534 | nladdr->nl_pad = 0; |
| 1535 | *addr_len = sizeof(*nladdr); |
| 1536 | |
| 1537 | if (peer) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1538 | nladdr->nl_pid = nlk->dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1539 | nladdr->nl_groups = netlink_group_mask(nlk->dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | } else { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1541 | nladdr->nl_pid = nlk->portid; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1542 | nladdr->nl_groups = nlk->groups ? nlk->groups[0] : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | } |
| 1544 | return 0; |
| 1545 | } |
| 1546 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1547 | static struct sock *netlink_getsockbyportid(struct sock *ssk, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1548 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | struct sock *sock; |
| 1550 | struct netlink_sock *nlk; |
| 1551 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1552 | sock = netlink_lookup(sock_net(ssk), ssk->sk_protocol, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | if (!sock) |
| 1554 | return ERR_PTR(-ECONNREFUSED); |
| 1555 | |
| 1556 | /* Don't bother queuing skb if kernel socket has no input function */ |
| 1557 | nlk = nlk_sk(sock); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1558 | if (sock->sk_state == NETLINK_CONNECTED && |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1559 | nlk->dst_portid != nlk_sk(ssk)->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | sock_put(sock); |
| 1561 | return ERR_PTR(-ECONNREFUSED); |
| 1562 | } |
| 1563 | return sock; |
| 1564 | } |
| 1565 | |
| 1566 | struct sock *netlink_getsockbyfilp(struct file *filp) |
| 1567 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1568 | struct inode *inode = file_inode(filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1569 | struct sock *sock; |
| 1570 | |
| 1571 | if (!S_ISSOCK(inode->i_mode)) |
| 1572 | return ERR_PTR(-ENOTSOCK); |
| 1573 | |
| 1574 | sock = SOCKET_I(inode)->sk; |
| 1575 | if (sock->sk_family != AF_NETLINK) |
| 1576 | return ERR_PTR(-EINVAL); |
| 1577 | |
| 1578 | sock_hold(sock); |
| 1579 | return sock; |
| 1580 | } |
| 1581 | |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1582 | static struct sk_buff *netlink_alloc_large_skb(unsigned int size, |
| 1583 | int broadcast) |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1584 | { |
| 1585 | struct sk_buff *skb; |
| 1586 | void *data; |
| 1587 | |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1588 | if (size <= NLMSG_GOODSIZE || broadcast) |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1589 | return alloc_skb(size, GFP_KERNEL); |
| 1590 | |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1591 | size = SKB_DATA_ALIGN(size) + |
| 1592 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1593 | |
| 1594 | data = vmalloc(size); |
| 1595 | if (data == NULL) |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1596 | return NULL; |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1597 | |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1598 | skb = build_skb(data, size); |
| 1599 | if (skb == NULL) |
| 1600 | vfree(data); |
| 1601 | else { |
| 1602 | skb->head_frag = 0; |
| 1603 | skb->destructor = netlink_skb_destructor; |
| 1604 | } |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1605 | |
| 1606 | return skb; |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1607 | } |
| 1608 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | /* |
| 1610 | * Attach a skb to a netlink socket. |
| 1611 | * The caller must hold a reference to the destination socket. On error, the |
| 1612 | * reference is dropped. The skb is not send to the destination, just all |
| 1613 | * all error checks are performed and memory in the queue is reserved. |
| 1614 | * Return values: |
| 1615 | * < 0: error. skb freed, reference to sock dropped. |
| 1616 | * 0: continue |
| 1617 | * 1: repeat lookup - reference dropped while waiting for socket memory. |
| 1618 | */ |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 1619 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1620 | long *timeo, struct sock *ssk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | { |
| 1622 | struct netlink_sock *nlk; |
| 1623 | |
| 1624 | nlk = nlk_sk(sk); |
| 1625 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 1626 | if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
| 1627 | test_bit(NETLINK_CONGESTED, &nlk->state)) && |
| 1628 | !netlink_skb_is_mmaped(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1629 | DECLARE_WAITQUEUE(wait, current); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1630 | if (!*timeo) { |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 1631 | if (!ssk || netlink_is_kernel(ssk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1632 | netlink_overrun(sk); |
| 1633 | sock_put(sk); |
| 1634 | kfree_skb(skb); |
| 1635 | return -EAGAIN; |
| 1636 | } |
| 1637 | |
| 1638 | __set_current_state(TASK_INTERRUPTIBLE); |
| 1639 | add_wait_queue(&nlk->wait, &wait); |
| 1640 | |
| 1641 | if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1642 | test_bit(NETLINK_CONGESTED, &nlk->state)) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | !sock_flag(sk, SOCK_DEAD)) |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1644 | *timeo = schedule_timeout(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | |
| 1646 | __set_current_state(TASK_RUNNING); |
| 1647 | remove_wait_queue(&nlk->wait, &wait); |
| 1648 | sock_put(sk); |
| 1649 | |
| 1650 | if (signal_pending(current)) { |
| 1651 | kfree_skb(skb); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1652 | return sock_intr_errno(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | } |
| 1654 | return 1; |
| 1655 | } |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1656 | netlink_skb_set_owner_r(skb, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | return 0; |
| 1658 | } |
| 1659 | |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1660 | static int __netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1661 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | int len = skb->len; |
| 1663 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 1664 | netlink_deliver_tap(skb); |
| 1665 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1666 | #ifdef CONFIG_NETLINK_MMAP |
| 1667 | if (netlink_skb_is_mmaped(skb)) |
| 1668 | netlink_queue_mmaped_skb(sk, skb); |
| 1669 | else if (netlink_rx_is_mmaped(sk)) |
| 1670 | netlink_ring_set_copied(sk, skb); |
| 1671 | else |
| 1672 | #endif /* CONFIG_NETLINK_MMAP */ |
| 1673 | skb_queue_tail(&sk->sk_receive_queue, skb); |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 1674 | sk->sk_data_ready(sk); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1675 | return len; |
| 1676 | } |
| 1677 | |
| 1678 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
| 1679 | { |
| 1680 | int len = __netlink_sendskb(sk, skb); |
| 1681 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1682 | sock_put(sk); |
| 1683 | return len; |
| 1684 | } |
| 1685 | |
| 1686 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb) |
| 1687 | { |
| 1688 | kfree_skb(skb); |
| 1689 | sock_put(sk); |
| 1690 | } |
| 1691 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1692 | 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] | 1693 | { |
| 1694 | int delta; |
| 1695 | |
Patrick McHardy | 1298ca4 | 2013-04-17 06:46:59 +0000 | [diff] [blame] | 1696 | WARN_ON(skb->sk != NULL); |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 1697 | if (netlink_skb_is_mmaped(skb)) |
| 1698 | return skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 1700 | delta = skb->end - skb->tail; |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1701 | if (is_vmalloc_addr(skb->head) || delta * 2 < skb->truesize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1702 | return skb; |
| 1703 | |
| 1704 | if (skb_shared(skb)) { |
| 1705 | struct sk_buff *nskb = skb_clone(skb, allocation); |
| 1706 | if (!nskb) |
| 1707 | return skb; |
Eric Dumazet | 8460c00 | 2012-04-19 02:24:28 +0000 | [diff] [blame] | 1708 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1709 | skb = nskb; |
| 1710 | } |
| 1711 | |
| 1712 | if (!pskb_expand_head(skb, 0, -delta, allocation)) |
| 1713 | skb->truesize -= delta; |
| 1714 | |
| 1715 | return skb; |
| 1716 | } |
| 1717 | |
Eric W. Biederman | 3fbc290 | 2012-05-24 17:21:27 -0600 | [diff] [blame] | 1718 | static int netlink_unicast_kernel(struct sock *sk, struct sk_buff *skb, |
| 1719 | struct sock *ssk) |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1720 | { |
| 1721 | int ret; |
| 1722 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1723 | |
| 1724 | ret = -ECONNREFUSED; |
| 1725 | if (nlk->netlink_rcv != NULL) { |
| 1726 | ret = skb->len; |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1727 | netlink_skb_set_owner_r(skb, sk); |
Patrick McHardy | e32123e | 2013-04-17 06:46:57 +0000 | [diff] [blame] | 1728 | NETLINK_CB(skb).sk = ssk; |
Daniel Borkmann | 73bfd37 | 2013-12-23 14:35:55 +0100 | [diff] [blame] | 1729 | netlink_deliver_tap_kernel(sk, ssk, skb); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1730 | nlk->netlink_rcv(skb); |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 1731 | consume_skb(skb); |
| 1732 | } else { |
| 1733 | kfree_skb(skb); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1734 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1735 | sock_put(sk); |
| 1736 | return ret; |
| 1737 | } |
| 1738 | |
| 1739 | int netlink_unicast(struct sock *ssk, struct sk_buff *skb, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1740 | u32 portid, int nonblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1741 | { |
| 1742 | struct sock *sk; |
| 1743 | int err; |
| 1744 | long timeo; |
| 1745 | |
| 1746 | skb = netlink_trim(skb, gfp_any()); |
| 1747 | |
| 1748 | timeo = sock_sndtimeo(ssk, nonblock); |
| 1749 | retry: |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1750 | sk = netlink_getsockbyportid(ssk, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1751 | if (IS_ERR(sk)) { |
| 1752 | kfree_skb(skb); |
| 1753 | return PTR_ERR(sk); |
| 1754 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1755 | if (netlink_is_kernel(sk)) |
Eric W. Biederman | 3fbc290 | 2012-05-24 17:21:27 -0600 | [diff] [blame] | 1756 | return netlink_unicast_kernel(sk, skb, ssk); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1757 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1758 | if (sk_filter(sk, skb)) { |
Wang Chen | 8487460 | 2008-07-01 19:55:09 -0700 | [diff] [blame] | 1759 | err = skb->len; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1760 | kfree_skb(skb); |
| 1761 | sock_put(sk); |
| 1762 | return err; |
| 1763 | } |
| 1764 | |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 1765 | err = netlink_attachskb(sk, skb, &timeo, ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1766 | if (err == 1) |
| 1767 | goto retry; |
| 1768 | if (err) |
| 1769 | return err; |
| 1770 | |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 1771 | return netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1773 | EXPORT_SYMBOL(netlink_unicast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1775 | struct sk_buff *netlink_alloc_skb(struct sock *ssk, unsigned int size, |
| 1776 | u32 dst_portid, gfp_t gfp_mask) |
| 1777 | { |
| 1778 | #ifdef CONFIG_NETLINK_MMAP |
| 1779 | struct sock *sk = NULL; |
| 1780 | struct sk_buff *skb; |
| 1781 | struct netlink_ring *ring; |
| 1782 | struct nl_mmap_hdr *hdr; |
| 1783 | unsigned int maxlen; |
| 1784 | |
| 1785 | sk = netlink_getsockbyportid(ssk, dst_portid); |
| 1786 | if (IS_ERR(sk)) |
| 1787 | goto out; |
| 1788 | |
| 1789 | ring = &nlk_sk(sk)->rx_ring; |
| 1790 | /* fast-path without atomic ops for common case: non-mmaped receiver */ |
| 1791 | if (ring->pg_vec == NULL) |
| 1792 | goto out_put; |
| 1793 | |
Thomas Graf | aae9f0e | 2013-11-30 13:21:31 +0100 | [diff] [blame] | 1794 | if (ring->frame_size - NL_MMAP_HDRLEN < size) |
| 1795 | goto out_put; |
| 1796 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1797 | skb = alloc_skb_head(gfp_mask); |
| 1798 | if (skb == NULL) |
| 1799 | goto err1; |
| 1800 | |
| 1801 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 1802 | /* check again under lock */ |
| 1803 | if (ring->pg_vec == NULL) |
| 1804 | goto out_free; |
| 1805 | |
Thomas Graf | aae9f0e | 2013-11-30 13:21:31 +0100 | [diff] [blame] | 1806 | /* check again under lock */ |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1807 | maxlen = ring->frame_size - NL_MMAP_HDRLEN; |
| 1808 | if (maxlen < size) |
| 1809 | goto out_free; |
| 1810 | |
| 1811 | netlink_forward_ring(ring); |
| 1812 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED); |
| 1813 | if (hdr == NULL) |
| 1814 | goto err2; |
| 1815 | netlink_ring_setup_skb(skb, sk, ring, hdr); |
| 1816 | netlink_set_status(hdr, NL_MMAP_STATUS_RESERVED); |
| 1817 | atomic_inc(&ring->pending); |
| 1818 | netlink_increment_head(ring); |
| 1819 | |
| 1820 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1821 | return skb; |
| 1822 | |
| 1823 | err2: |
| 1824 | kfree_skb(skb); |
| 1825 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 1826 | netlink_overrun(sk); |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1827 | err1: |
| 1828 | sock_put(sk); |
| 1829 | return NULL; |
| 1830 | |
| 1831 | out_free: |
| 1832 | kfree_skb(skb); |
| 1833 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1834 | out_put: |
| 1835 | sock_put(sk); |
| 1836 | out: |
| 1837 | #endif |
| 1838 | return alloc_skb(size, gfp_mask); |
| 1839 | } |
| 1840 | EXPORT_SYMBOL_GPL(netlink_alloc_skb); |
| 1841 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1842 | int netlink_has_listeners(struct sock *sk, unsigned int group) |
| 1843 | { |
| 1844 | int res = 0; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1845 | struct listeners *listeners; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1846 | |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 1847 | BUG_ON(!netlink_is_kernel(sk)); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1848 | |
| 1849 | rcu_read_lock(); |
| 1850 | listeners = rcu_dereference(nl_table[sk->sk_protocol].listeners); |
| 1851 | |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1852 | if (listeners && group - 1 < nl_table[sk->sk_protocol].groups) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1853 | res = test_bit(group - 1, listeners->masks); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1854 | |
| 1855 | rcu_read_unlock(); |
| 1856 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1857 | return res; |
| 1858 | } |
| 1859 | EXPORT_SYMBOL_GPL(netlink_has_listeners); |
| 1860 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1861 | static int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1862 | { |
| 1863 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1864 | |
| 1865 | if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf && |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1866 | !test_bit(NETLINK_CONGESTED, &nlk->state)) { |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1867 | netlink_skb_set_owner_r(skb, sk); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1868 | __netlink_sendskb(sk, skb); |
stephen hemminger | 2c645800 | 2011-12-22 08:52:03 +0000 | [diff] [blame] | 1869 | return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1870 | } |
| 1871 | return -1; |
| 1872 | } |
| 1873 | |
| 1874 | struct netlink_broadcast_data { |
| 1875 | struct sock *exclude_sk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1876 | struct net *net; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1877 | u32 portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1878 | u32 group; |
| 1879 | int failure; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1880 | int delivery_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1881 | int congested; |
| 1882 | int delivered; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 1883 | gfp_t allocation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1884 | struct sk_buff *skb, *skb2; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1885 | int (*tx_filter)(struct sock *dsk, struct sk_buff *skb, void *data); |
| 1886 | void *tx_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | }; |
| 1888 | |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1889 | static void do_one_broadcast(struct sock *sk, |
| 1890 | struct netlink_broadcast_data *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1891 | { |
| 1892 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1893 | int val; |
| 1894 | |
| 1895 | if (p->exclude_sk == sk) |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1896 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1897 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1898 | if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups || |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1899 | !test_bit(p->group - 1, nlk->groups)) |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1900 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1901 | |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1902 | if (!net_eq(sock_net(sk), p->net)) |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1903 | return; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1904 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1905 | if (p->failure) { |
| 1906 | netlink_overrun(sk); |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1907 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | } |
| 1909 | |
| 1910 | sock_hold(sk); |
| 1911 | if (p->skb2 == NULL) { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1912 | if (skb_shared(p->skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | p->skb2 = skb_clone(p->skb, p->allocation); |
| 1914 | } else { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1915 | p->skb2 = skb_get(p->skb); |
| 1916 | /* |
| 1917 | * skb ownership may have been set when |
| 1918 | * delivered to a previous socket. |
| 1919 | */ |
| 1920 | skb_orphan(p->skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | } |
| 1922 | } |
| 1923 | if (p->skb2 == NULL) { |
| 1924 | netlink_overrun(sk); |
| 1925 | /* Clone failed. Notify ALL listeners. */ |
| 1926 | p->failure = 1; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1927 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1928 | p->delivery_failure = 1; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1929 | } else if (p->tx_filter && p->tx_filter(sk, p->skb2, p->tx_data)) { |
| 1930 | kfree_skb(p->skb2); |
| 1931 | p->skb2 = NULL; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1932 | } else if (sk_filter(sk, p->skb2)) { |
| 1933 | kfree_skb(p->skb2); |
| 1934 | p->skb2 = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | } else if ((val = netlink_broadcast_deliver(sk, p->skb2)) < 0) { |
| 1936 | netlink_overrun(sk); |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1937 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1938 | p->delivery_failure = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | } else { |
| 1940 | p->congested |= val; |
| 1941 | p->delivered = 1; |
| 1942 | p->skb2 = NULL; |
| 1943 | } |
| 1944 | sock_put(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1945 | } |
| 1946 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1947 | 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] | 1948 | u32 group, gfp_t allocation, |
| 1949 | int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), |
| 1950 | void *filter_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1952 | struct net *net = sock_net(ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1953 | struct netlink_broadcast_data info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | struct sock *sk; |
| 1955 | |
| 1956 | skb = netlink_trim(skb, allocation); |
| 1957 | |
| 1958 | info.exclude_sk = ssk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1959 | info.net = net; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1960 | info.portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1961 | info.group = group; |
| 1962 | info.failure = 0; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1963 | info.delivery_failure = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1964 | info.congested = 0; |
| 1965 | info.delivered = 0; |
| 1966 | info.allocation = allocation; |
| 1967 | info.skb = skb; |
| 1968 | info.skb2 = NULL; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1969 | info.tx_filter = filter; |
| 1970 | info.tx_data = filter_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | |
| 1972 | /* While we sleep in clone, do not allow to change socket list */ |
| 1973 | |
| 1974 | netlink_lock_table(); |
| 1975 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1976 | sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1977 | do_one_broadcast(sk, &info); |
| 1978 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 1979 | consume_skb(skb); |
Tommy S. Christensen | aa1c6a6 | 2005-05-19 13:07:32 -0700 | [diff] [blame] | 1980 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | netlink_unlock_table(); |
| 1982 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 1983 | if (info.delivery_failure) { |
| 1984 | kfree_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1985 | return -ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1986 | } |
| 1987 | consume_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1988 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1989 | if (info.delivered) { |
| 1990 | if (info.congested && (allocation & __GFP_WAIT)) |
| 1991 | yield(); |
| 1992 | return 0; |
| 1993 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | return -ESRCH; |
| 1995 | } |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1996 | EXPORT_SYMBOL(netlink_broadcast_filtered); |
| 1997 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1998 | 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] | 1999 | u32 group, gfp_t allocation) |
| 2000 | { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2001 | return netlink_broadcast_filtered(ssk, skb, portid, group, allocation, |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 2002 | NULL, NULL); |
| 2003 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2004 | EXPORT_SYMBOL(netlink_broadcast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2005 | |
| 2006 | struct netlink_set_err_data { |
| 2007 | struct sock *exclude_sk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2008 | u32 portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | u32 group; |
| 2010 | int code; |
| 2011 | }; |
| 2012 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 2013 | 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] | 2014 | { |
| 2015 | struct netlink_sock *nlk = nlk_sk(sk); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2016 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2017 | |
| 2018 | if (sk == p->exclude_sk) |
| 2019 | goto out; |
| 2020 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 2021 | if (!net_eq(sock_net(sk), sock_net(p->exclude_sk))) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2022 | goto out; |
| 2023 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2024 | if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups || |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 2025 | !test_bit(p->group - 1, nlk->groups)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2026 | goto out; |
| 2027 | |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2028 | if (p->code == ENOBUFS && nlk->flags & NETLINK_RECV_NO_ENOBUFS) { |
| 2029 | ret = 1; |
| 2030 | goto out; |
| 2031 | } |
| 2032 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | sk->sk_err = p->code; |
| 2034 | sk->sk_error_report(sk); |
| 2035 | out: |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2036 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | } |
| 2038 | |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2039 | /** |
| 2040 | * netlink_set_err - report error to broadcast listeners |
| 2041 | * @ssk: the kernel netlink socket, as returned by netlink_kernel_create() |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2042 | * @portid: the PORTID of a process that we want to skip (if any) |
Johannes Berg | 840e93f2 | 2013-11-19 10:35:40 +0100 | [diff] [blame] | 2043 | * @group: the broadcast group that will notice the error |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2044 | * @code: error code, must be negative (as usual in kernelspace) |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2045 | * |
| 2046 | * This function returns the number of broadcast listeners that have set the |
| 2047 | * NETLINK_RECV_NO_ENOBUFS socket option. |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2048 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2049 | 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] | 2050 | { |
| 2051 | struct netlink_set_err_data info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2052 | struct sock *sk; |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2053 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2054 | |
| 2055 | info.exclude_sk = ssk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2056 | info.portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2057 | info.group = group; |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2058 | /* sk->sk_err wants a positive error value */ |
| 2059 | info.code = -code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2060 | |
| 2061 | read_lock(&nl_table_lock); |
| 2062 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2063 | 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] | 2064 | ret += do_one_set_err(sk, &info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2065 | |
| 2066 | read_unlock(&nl_table_lock); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2067 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2068 | } |
Pablo Neira Ayuso | dd5b6ce | 2009-03-23 13:21:06 +0100 | [diff] [blame] | 2069 | EXPORT_SYMBOL(netlink_set_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 2071 | /* must be called with netlink table grabbed */ |
| 2072 | static void netlink_update_socket_mc(struct netlink_sock *nlk, |
| 2073 | unsigned int group, |
| 2074 | int is_new) |
| 2075 | { |
| 2076 | int old, new = !!is_new, subscriptions; |
| 2077 | |
| 2078 | old = test_bit(group - 1, nlk->groups); |
| 2079 | subscriptions = nlk->subscriptions - old + new; |
| 2080 | if (new) |
| 2081 | __set_bit(group - 1, nlk->groups); |
| 2082 | else |
| 2083 | __clear_bit(group - 1, nlk->groups); |
| 2084 | netlink_update_subscriptions(&nlk->sk, subscriptions); |
| 2085 | netlink_update_listeners(&nlk->sk); |
| 2086 | } |
| 2087 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2088 | static int netlink_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2089 | char __user *optval, unsigned int optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2090 | { |
| 2091 | struct sock *sk = sock->sk; |
| 2092 | struct netlink_sock *nlk = nlk_sk(sk); |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 2093 | unsigned int val = 0; |
| 2094 | int err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2095 | |
| 2096 | if (level != SOL_NETLINK) |
| 2097 | return -ENOPROTOOPT; |
| 2098 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 2099 | if (optname != NETLINK_RX_RING && optname != NETLINK_TX_RING && |
| 2100 | optlen >= sizeof(int) && |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 2101 | get_user(val, (unsigned int __user *)optval)) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2102 | return -EFAULT; |
| 2103 | |
| 2104 | switch (optname) { |
| 2105 | case NETLINK_PKTINFO: |
| 2106 | if (val) |
| 2107 | nlk->flags |= NETLINK_RECV_PKTINFO; |
| 2108 | else |
| 2109 | nlk->flags &= ~NETLINK_RECV_PKTINFO; |
| 2110 | err = 0; |
| 2111 | break; |
| 2112 | case NETLINK_ADD_MEMBERSHIP: |
| 2113 | case NETLINK_DROP_MEMBERSHIP: { |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 2114 | if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV)) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2115 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2116 | err = netlink_realloc_groups(sk); |
| 2117 | if (err) |
| 2118 | return err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2119 | if (!val || val - 1 >= nlk->ngroups) |
| 2120 | return -EINVAL; |
Richard Guy Briggs | 7774d5e | 2014-04-22 21:31:55 -0400 | [diff] [blame] | 2121 | if (optname == NETLINK_ADD_MEMBERSHIP && nlk->netlink_bind) { |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 2122 | err = nlk->netlink_bind(sock_net(sk), val); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 2123 | if (err) |
| 2124 | return err; |
| 2125 | } |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2126 | netlink_table_grab(); |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 2127 | netlink_update_socket_mc(nlk, val, |
| 2128 | optname == NETLINK_ADD_MEMBERSHIP); |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2129 | netlink_table_ungrab(); |
Richard Guy Briggs | 7774d5e | 2014-04-22 21:31:55 -0400 | [diff] [blame] | 2130 | if (optname == NETLINK_DROP_MEMBERSHIP && nlk->netlink_unbind) |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 2131 | nlk->netlink_unbind(sock_net(sk), val); |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 2132 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2133 | err = 0; |
| 2134 | break; |
| 2135 | } |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 2136 | case NETLINK_BROADCAST_ERROR: |
| 2137 | if (val) |
| 2138 | nlk->flags |= NETLINK_BROADCAST_SEND_ERROR; |
| 2139 | else |
| 2140 | nlk->flags &= ~NETLINK_BROADCAST_SEND_ERROR; |
| 2141 | err = 0; |
| 2142 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2143 | case NETLINK_NO_ENOBUFS: |
| 2144 | if (val) { |
| 2145 | nlk->flags |= NETLINK_RECV_NO_ENOBUFS; |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 2146 | clear_bit(NETLINK_CONGESTED, &nlk->state); |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2147 | wake_up_interruptible(&nlk->wait); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2148 | } else { |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2149 | nlk->flags &= ~NETLINK_RECV_NO_ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2150 | } |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2151 | err = 0; |
| 2152 | break; |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 2153 | #ifdef CONFIG_NETLINK_MMAP |
| 2154 | case NETLINK_RX_RING: |
| 2155 | case NETLINK_TX_RING: { |
| 2156 | struct nl_mmap_req req; |
| 2157 | |
| 2158 | /* Rings might consume more memory than queue limits, require |
| 2159 | * CAP_NET_ADMIN. |
| 2160 | */ |
| 2161 | if (!capable(CAP_NET_ADMIN)) |
| 2162 | return -EPERM; |
| 2163 | if (optlen < sizeof(req)) |
| 2164 | return -EINVAL; |
| 2165 | if (copy_from_user(&req, optval, sizeof(req))) |
| 2166 | return -EFAULT; |
| 2167 | err = netlink_set_ring(sk, &req, false, |
| 2168 | optname == NETLINK_TX_RING); |
| 2169 | break; |
| 2170 | } |
| 2171 | #endif /* CONFIG_NETLINK_MMAP */ |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2172 | default: |
| 2173 | err = -ENOPROTOOPT; |
| 2174 | } |
| 2175 | return err; |
| 2176 | } |
| 2177 | |
| 2178 | static int netlink_getsockopt(struct socket *sock, int level, int optname, |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2179 | char __user *optval, int __user *optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2180 | { |
| 2181 | struct sock *sk = sock->sk; |
| 2182 | struct netlink_sock *nlk = nlk_sk(sk); |
| 2183 | int len, val, err; |
| 2184 | |
| 2185 | if (level != SOL_NETLINK) |
| 2186 | return -ENOPROTOOPT; |
| 2187 | |
| 2188 | if (get_user(len, optlen)) |
| 2189 | return -EFAULT; |
| 2190 | if (len < 0) |
| 2191 | return -EINVAL; |
| 2192 | |
| 2193 | switch (optname) { |
| 2194 | case NETLINK_PKTINFO: |
| 2195 | if (len < sizeof(int)) |
| 2196 | return -EINVAL; |
| 2197 | len = sizeof(int); |
| 2198 | val = nlk->flags & NETLINK_RECV_PKTINFO ? 1 : 0; |
Heiko Carstens | a27b58f | 2006-10-30 15:06:12 -0800 | [diff] [blame] | 2199 | if (put_user(len, optlen) || |
| 2200 | put_user(val, optval)) |
| 2201 | return -EFAULT; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2202 | err = 0; |
| 2203 | break; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 2204 | case NETLINK_BROADCAST_ERROR: |
| 2205 | if (len < sizeof(int)) |
| 2206 | return -EINVAL; |
| 2207 | len = sizeof(int); |
| 2208 | val = nlk->flags & NETLINK_BROADCAST_SEND_ERROR ? 1 : 0; |
| 2209 | if (put_user(len, optlen) || |
| 2210 | put_user(val, optval)) |
| 2211 | return -EFAULT; |
| 2212 | err = 0; |
| 2213 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2214 | case NETLINK_NO_ENOBUFS: |
| 2215 | if (len < sizeof(int)) |
| 2216 | return -EINVAL; |
| 2217 | len = sizeof(int); |
| 2218 | val = nlk->flags & NETLINK_RECV_NO_ENOBUFS ? 1 : 0; |
| 2219 | if (put_user(len, optlen) || |
| 2220 | put_user(val, optval)) |
| 2221 | return -EFAULT; |
| 2222 | err = 0; |
| 2223 | break; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2224 | default: |
| 2225 | err = -ENOPROTOOPT; |
| 2226 | } |
| 2227 | return err; |
| 2228 | } |
| 2229 | |
| 2230 | static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
| 2231 | { |
| 2232 | struct nl_pktinfo info; |
| 2233 | |
| 2234 | info.group = NETLINK_CB(skb).dst_group; |
| 2235 | put_cmsg(msg, SOL_NETLINK, NETLINK_PKTINFO, sizeof(info), &info); |
| 2236 | } |
| 2237 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2238 | static int netlink_sendmsg(struct kiocb *kiocb, struct socket *sock, |
| 2239 | struct msghdr *msg, size_t len) |
| 2240 | { |
| 2241 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 2242 | struct sock *sk = sock->sk; |
| 2243 | struct netlink_sock *nlk = nlk_sk(sk); |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 2244 | DECLARE_SOCKADDR(struct sockaddr_nl *, addr, msg->msg_name); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2245 | u32 dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2246 | u32 dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2247 | struct sk_buff *skb; |
| 2248 | int err; |
| 2249 | struct scm_cookie scm; |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 2250 | u32 netlink_skb_flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2251 | |
| 2252 | if (msg->msg_flags&MSG_OOB) |
| 2253 | return -EOPNOTSUPP; |
| 2254 | |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 2255 | if (NULL == siocb->scm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2256 | siocb->scm = &scm; |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 2257 | |
Eric Dumazet | e0e3cea | 2012-08-21 06:21:17 +0000 | [diff] [blame] | 2258 | err = scm_send(sock, msg, siocb->scm, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2259 | if (err < 0) |
| 2260 | return err; |
| 2261 | |
| 2262 | if (msg->msg_namelen) { |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2263 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2264 | if (addr->nl_family != AF_NETLINK) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2265 | goto out; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2266 | dst_portid = addr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2267 | dst_group = ffs(addr->nl_groups); |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2268 | err = -EPERM; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2269 | if ((dst_group || dst_portid) && |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 2270 | !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND)) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2271 | goto out; |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 2272 | netlink_skb_flags |= NETLINK_SKB_DST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | } else { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2274 | dst_portid = nlk->dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2275 | dst_group = nlk->dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2276 | } |
| 2277 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2278 | if (!nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2279 | err = netlink_autobind(sock); |
| 2280 | if (err) |
| 2281 | goto out; |
| 2282 | } |
| 2283 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 2284 | if (netlink_tx_is_mmaped(sk) && |
Al Viro | c0371da | 2014-11-24 10:42:55 -0500 | [diff] [blame] | 2285 | msg->msg_iter.iov->iov_base == NULL) { |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 2286 | err = netlink_mmap_sendmsg(sk, msg, dst_portid, dst_group, |
| 2287 | siocb); |
| 2288 | goto out; |
| 2289 | } |
| 2290 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2291 | err = -EMSGSIZE; |
| 2292 | if (len > sk->sk_sndbuf - 32) |
| 2293 | goto out; |
| 2294 | err = -ENOBUFS; |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 2295 | skb = netlink_alloc_large_skb(len, dst_group); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2296 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2297 | goto out; |
| 2298 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2299 | NETLINK_CB(skb).portid = nlk->portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2300 | NETLINK_CB(skb).dst_group = dst_group; |
Eric W. Biederman | dbe9a41 | 2012-09-06 18:20:01 +0000 | [diff] [blame] | 2301 | NETLINK_CB(skb).creds = siocb->scm->creds; |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 2302 | NETLINK_CB(skb).flags = netlink_skb_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2303 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | err = -EFAULT; |
Al Viro | 6ce8e9c | 2014-04-06 21:25:44 -0400 | [diff] [blame] | 2305 | if (memcpy_from_msg(skb_put(skb, len), msg, len)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | kfree_skb(skb); |
| 2307 | goto out; |
| 2308 | } |
| 2309 | |
| 2310 | err = security_netlink_send(sk, skb); |
| 2311 | if (err) { |
| 2312 | kfree_skb(skb); |
| 2313 | goto out; |
| 2314 | } |
| 2315 | |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2316 | if (dst_group) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2317 | atomic_inc(&skb->users); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2318 | netlink_broadcast(sk, skb, dst_portid, dst_group, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2319 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2320 | err = netlink_unicast(sk, skb, dst_portid, msg->msg_flags&MSG_DONTWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2321 | |
| 2322 | out: |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2323 | scm_destroy(siocb->scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2324 | return err; |
| 2325 | } |
| 2326 | |
| 2327 | static int netlink_recvmsg(struct kiocb *kiocb, struct socket *sock, |
| 2328 | struct msghdr *msg, size_t len, |
| 2329 | int flags) |
| 2330 | { |
| 2331 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 2332 | struct scm_cookie scm; |
| 2333 | struct sock *sk = sock->sk; |
| 2334 | struct netlink_sock *nlk = nlk_sk(sk); |
| 2335 | int noblock = flags&MSG_DONTWAIT; |
| 2336 | size_t copied; |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2337 | struct sk_buff *skb, *data_skb; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2338 | int err, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2339 | |
| 2340 | if (flags&MSG_OOB) |
| 2341 | return -EOPNOTSUPP; |
| 2342 | |
| 2343 | copied = 0; |
| 2344 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2345 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
| 2346 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2347 | goto out; |
| 2348 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2349 | data_skb = skb; |
| 2350 | |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2351 | #ifdef CONFIG_COMPAT_NETLINK_MESSAGES |
| 2352 | if (unlikely(skb_shinfo(skb)->frag_list)) { |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2353 | /* |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2354 | * If this skb has a frag_list, then here that means that we |
| 2355 | * will have to use the frag_list skb's data for compat tasks |
| 2356 | * and the regular skb's data for normal (non-compat) tasks. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2357 | * |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2358 | * If we need to send the compat skb, assign it to the |
| 2359 | * 'data_skb' variable so that it will be used below for data |
| 2360 | * copying. We keep 'skb' for everything else, including |
| 2361 | * freeing both later. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2362 | */ |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2363 | if (flags & MSG_CMSG_COMPAT) |
| 2364 | data_skb = skb_shinfo(skb)->frag_list; |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2365 | } |
| 2366 | #endif |
| 2367 | |
Eric Dumazet | 9063e21 | 2014-03-07 12:02:33 -0800 | [diff] [blame] | 2368 | /* Record the max length of recvmsg() calls for future allocations */ |
| 2369 | nlk->max_recvmsg_len = max(nlk->max_recvmsg_len, len); |
| 2370 | nlk->max_recvmsg_len = min_t(size_t, nlk->max_recvmsg_len, |
| 2371 | 16384); |
| 2372 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2373 | copied = data_skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2374 | if (len < copied) { |
| 2375 | msg->msg_flags |= MSG_TRUNC; |
| 2376 | copied = len; |
| 2377 | } |
| 2378 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2379 | skb_reset_transport_header(data_skb); |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 2380 | err = skb_copy_datagram_msg(data_skb, 0, msg, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2381 | |
| 2382 | if (msg->msg_name) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 2383 | DECLARE_SOCKADDR(struct sockaddr_nl *, addr, msg->msg_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2384 | addr->nl_family = AF_NETLINK; |
| 2385 | addr->nl_pad = 0; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2386 | addr->nl_pid = NETLINK_CB(skb).portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2387 | addr->nl_groups = netlink_group_mask(NETLINK_CB(skb).dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2388 | msg->msg_namelen = sizeof(*addr); |
| 2389 | } |
| 2390 | |
Patrick McHardy | cc9a06c | 2006-03-12 20:34:27 -0800 | [diff] [blame] | 2391 | if (nlk->flags & NETLINK_RECV_PKTINFO) |
| 2392 | netlink_cmsg_recv_pktinfo(msg, skb); |
| 2393 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2394 | if (NULL == siocb->scm) { |
| 2395 | memset(&scm, 0, sizeof(scm)); |
| 2396 | siocb->scm = &scm; |
| 2397 | } |
| 2398 | siocb->scm->creds = *NETLINK_CREDS(skb); |
Patrick McHardy | 188ccb5 | 2007-05-03 03:27:01 -0700 | [diff] [blame] | 2399 | if (flags & MSG_TRUNC) |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2400 | copied = data_skb->len; |
David S. Miller | daa3766 | 2010-08-15 23:21:50 -0700 | [diff] [blame] | 2401 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2402 | skb_free_datagram(sk, skb); |
| 2403 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2404 | if (nlk->cb_running && |
| 2405 | atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2) { |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2406 | ret = netlink_dump(sk); |
| 2407 | if (ret) { |
Ben Pfaff | ac30ef8 | 2014-07-09 10:31:22 -0700 | [diff] [blame] | 2408 | sk->sk_err = -ret; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2409 | sk->sk_error_report(sk); |
| 2410 | } |
| 2411 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2412 | |
| 2413 | scm_recv(sock, msg, siocb->scm, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2414 | out: |
| 2415 | netlink_rcv_wake(sk); |
| 2416 | return err ? : copied; |
| 2417 | } |
| 2418 | |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 2419 | static void netlink_data_ready(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2420 | { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2421 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2422 | } |
| 2423 | |
| 2424 | /* |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2425 | * We export these functions to other modules. They provide a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2426 | * complete set of kernel non-blocking support for message |
| 2427 | * queueing. |
| 2428 | */ |
| 2429 | |
| 2430 | struct sock * |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 2431 | __netlink_kernel_create(struct net *net, int unit, struct module *module, |
| 2432 | struct netlink_kernel_cfg *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2433 | { |
| 2434 | struct socket *sock; |
| 2435 | struct sock *sk; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2436 | struct netlink_sock *nlk; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2437 | struct listeners *listeners = NULL; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2438 | struct mutex *cb_mutex = cfg ? cfg->cb_mutex : NULL; |
| 2439 | unsigned int groups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2440 | |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2441 | BUG_ON(!nl_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2442 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2443 | if (unit < 0 || unit >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2444 | return NULL; |
| 2445 | |
| 2446 | if (sock_create_lite(PF_NETLINK, SOCK_DGRAM, unit, &sock)) |
| 2447 | return NULL; |
| 2448 | |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 2449 | /* |
| 2450 | * We have to just have a reference on the net from sk, but don't |
| 2451 | * get_net it. Besides, we cannot get and then put the net here. |
| 2452 | * So we create one inside init_net and the move it to net. |
| 2453 | */ |
| 2454 | |
| 2455 | if (__netlink_create(&init_net, sock, cb_mutex, unit) < 0) |
| 2456 | goto out_sock_release_nosk; |
| 2457 | |
| 2458 | sk = sock->sk; |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 2459 | sk_change_net(sk, net); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2460 | |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2461 | if (!cfg || cfg->groups < 32) |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2462 | groups = 32; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2463 | else |
| 2464 | groups = cfg->groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2465 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2466 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2467 | if (!listeners) |
| 2468 | goto out_sock_release; |
| 2469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | sk->sk_data_ready = netlink_data_ready; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2471 | if (cfg && cfg->input) |
| 2472 | nlk_sk(sk)->netlink_rcv = cfg->input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2473 | |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2474 | if (netlink_insert(sk, net, 0)) |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2475 | goto out_sock_release; |
| 2476 | |
| 2477 | nlk = nlk_sk(sk); |
| 2478 | nlk->flags |= NETLINK_KERNEL_SOCKET; |
| 2479 | |
| 2480 | netlink_table_grab(); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2481 | if (!nl_table[unit].registered) { |
| 2482 | nl_table[unit].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2483 | rcu_assign_pointer(nl_table[unit].listeners, listeners); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2484 | nl_table[unit].cb_mutex = cb_mutex; |
| 2485 | nl_table[unit].module = module; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 2486 | if (cfg) { |
| 2487 | nl_table[unit].bind = cfg->bind; |
Hiroaki SHIMODA | 6251edd | 2014-11-13 04:24:10 +0900 | [diff] [blame] | 2488 | nl_table[unit].unbind = cfg->unbind; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 2489 | nl_table[unit].flags = cfg->flags; |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 2490 | if (cfg->compare) |
| 2491 | nl_table[unit].compare = cfg->compare; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 2492 | } |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2493 | nl_table[unit].registered = 1; |
Jesper Juhl | f937f1f46 | 2007-10-15 01:39:12 -0700 | [diff] [blame] | 2494 | } else { |
| 2495 | kfree(listeners); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 2496 | nl_table[unit].registered++; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2497 | } |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2498 | netlink_table_ungrab(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2499 | return sk; |
| 2500 | |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2501 | out_sock_release: |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2502 | kfree(listeners); |
Denis V. Lunev | 9dfbec1 | 2008-02-29 11:17:56 -0800 | [diff] [blame] | 2503 | netlink_kernel_release(sk); |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 2504 | return NULL; |
| 2505 | |
| 2506 | out_sock_release_nosk: |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2507 | sock_release(sock); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2508 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2509 | } |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 2510 | EXPORT_SYMBOL(__netlink_kernel_create); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 2511 | |
| 2512 | void |
| 2513 | netlink_kernel_release(struct sock *sk) |
| 2514 | { |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 2515 | sk_release_kernel(sk); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 2516 | } |
| 2517 | EXPORT_SYMBOL(netlink_kernel_release); |
| 2518 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2519 | int __netlink_change_ngroups(struct sock *sk, unsigned int groups) |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2520 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2521 | struct listeners *new, *old; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2522 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2523 | |
| 2524 | if (groups < 32) |
| 2525 | groups = 32; |
| 2526 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2527 | if (NLGRPSZ(tbl->groups) < NLGRPSZ(groups)) { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2528 | new = kzalloc(sizeof(*new) + NLGRPSZ(groups), GFP_ATOMIC); |
| 2529 | if (!new) |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2530 | return -ENOMEM; |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 2531 | old = nl_deref_protected(tbl->listeners); |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2532 | memcpy(new->masks, old->masks, NLGRPSZ(tbl->groups)); |
| 2533 | rcu_assign_pointer(tbl->listeners, new); |
| 2534 | |
Lai Jiangshan | 37b6b93 | 2011-03-15 18:01:42 +0800 | [diff] [blame] | 2535 | kfree_rcu(old, rcu); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2536 | } |
| 2537 | tbl->groups = groups; |
| 2538 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2539 | return 0; |
| 2540 | } |
| 2541 | |
| 2542 | /** |
| 2543 | * netlink_change_ngroups - change number of multicast groups |
| 2544 | * |
| 2545 | * This changes the number of multicast groups that are available |
| 2546 | * on a certain netlink family. Note that it is not possible to |
| 2547 | * change the number of groups to below 32. Also note that it does |
| 2548 | * not implicitly call netlink_clear_multicast_users() when the |
| 2549 | * number of groups is reduced. |
| 2550 | * |
| 2551 | * @sk: The kernel netlink socket, as returned by netlink_kernel_create(). |
| 2552 | * @groups: The new number of groups. |
| 2553 | */ |
| 2554 | int netlink_change_ngroups(struct sock *sk, unsigned int groups) |
| 2555 | { |
| 2556 | int err; |
| 2557 | |
| 2558 | netlink_table_grab(); |
| 2559 | err = __netlink_change_ngroups(sk, groups); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2560 | netlink_table_ungrab(); |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2561 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2562 | return err; |
| 2563 | } |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2564 | |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 2565 | void __netlink_clear_multicast_users(struct sock *ksk, unsigned int group) |
| 2566 | { |
| 2567 | struct sock *sk; |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 2568 | struct netlink_table *tbl = &nl_table[ksk->sk_protocol]; |
| 2569 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2570 | sk_for_each_bound(sk, &tbl->mc_list) |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 2571 | netlink_update_socket_mc(nlk_sk(sk), group, 0); |
| 2572 | } |
| 2573 | |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2574 | struct nlmsghdr * |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2575 | __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] | 2576 | { |
| 2577 | struct nlmsghdr *nlh; |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 2578 | int size = nlmsg_msg_size(len); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2579 | |
Wang Yufen | 23b4567 | 2014-02-17 16:53:32 +0800 | [diff] [blame] | 2580 | nlh = (struct nlmsghdr *)skb_put(skb, NLMSG_ALIGN(size)); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2581 | nlh->nlmsg_type = type; |
| 2582 | nlh->nlmsg_len = size; |
| 2583 | nlh->nlmsg_flags = flags; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2584 | nlh->nlmsg_pid = portid; |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2585 | nlh->nlmsg_seq = seq; |
| 2586 | if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0) |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 2587 | memset(nlmsg_data(nlh) + len, 0, NLMSG_ALIGN(size) - size); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2588 | return nlh; |
| 2589 | } |
| 2590 | EXPORT_SYMBOL(__nlmsg_put); |
| 2591 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2592 | /* |
| 2593 | * It looks a bit ugly. |
| 2594 | * It would be better to create kernel thread. |
| 2595 | */ |
| 2596 | |
| 2597 | static int netlink_dump(struct sock *sk) |
| 2598 | { |
| 2599 | struct netlink_sock *nlk = nlk_sk(sk); |
| 2600 | struct netlink_callback *cb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2601 | struct sk_buff *skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2602 | struct nlmsghdr *nlh; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2603 | int len, err = -ENOBUFS; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2604 | int alloc_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2605 | |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2606 | mutex_lock(nlk->cb_mutex); |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2607 | if (!nlk->cb_running) { |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2608 | err = -EINVAL; |
| 2609 | goto errout_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2610 | } |
| 2611 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2612 | cb = &nlk->cb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2613 | alloc_size = max_t(int, cb->min_dump_alloc, NLMSG_GOODSIZE); |
| 2614 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2615 | if (!netlink_rx_is_mmaped(sk) && |
| 2616 | atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) |
| 2617 | goto errout_skb; |
Eric Dumazet | 9063e21 | 2014-03-07 12:02:33 -0800 | [diff] [blame] | 2618 | |
| 2619 | /* NLMSG_GOODSIZE is small to avoid high order allocations being |
| 2620 | * required, but it makes sense to _attempt_ a 16K bytes allocation |
| 2621 | * to reduce number of system calls on dump operations, if user |
| 2622 | * ever provided a big enough buffer. |
| 2623 | */ |
| 2624 | if (alloc_size < nlk->max_recvmsg_len) { |
| 2625 | skb = netlink_alloc_skb(sk, |
| 2626 | nlk->max_recvmsg_len, |
| 2627 | nlk->portid, |
| 2628 | GFP_KERNEL | |
| 2629 | __GFP_NOWARN | |
| 2630 | __GFP_NORETRY); |
| 2631 | /* available room should be exact amount to avoid MSG_TRUNC */ |
| 2632 | if (skb) |
| 2633 | skb_reserve(skb, skb_tailroom(skb) - |
| 2634 | nlk->max_recvmsg_len); |
| 2635 | } |
| 2636 | if (!skb) |
| 2637 | skb = netlink_alloc_skb(sk, alloc_size, nlk->portid, |
| 2638 | GFP_KERNEL); |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2639 | if (!skb) |
Dan Carpenter | c63d6ea | 2011-06-15 03:11:42 +0000 | [diff] [blame] | 2640 | goto errout_skb; |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2641 | netlink_skb_set_owner_r(skb, sk); |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2643 | len = cb->dump(skb, cb); |
| 2644 | |
| 2645 | if (len > 0) { |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2646 | mutex_unlock(nlk->cb_mutex); |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 2647 | |
| 2648 | if (sk_filter(sk, skb)) |
| 2649 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 2650 | else |
| 2651 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2652 | return 0; |
| 2653 | } |
| 2654 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2655 | nlh = nlmsg_put_answer(skb, cb, NLMSG_DONE, sizeof(len), NLM_F_MULTI); |
| 2656 | if (!nlh) |
| 2657 | goto errout_skb; |
| 2658 | |
Johannes Berg | 670dc28 | 2011-06-20 13:40:46 +0200 | [diff] [blame] | 2659 | nl_dump_check_consistent(cb, nlh); |
| 2660 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2661 | memcpy(nlmsg_data(nlh), &len, sizeof(len)); |
| 2662 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 2663 | if (sk_filter(sk, skb)) |
| 2664 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 2665 | else |
| 2666 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2667 | |
Thomas Graf | a8f74b2 | 2005-11-10 02:25:52 +0100 | [diff] [blame] | 2668 | if (cb->done) |
| 2669 | cb->done(cb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2670 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2671 | nlk->cb_running = false; |
| 2672 | mutex_unlock(nlk->cb_mutex); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2673 | module_put(cb->module); |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2674 | consume_skb(cb->skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2675 | return 0; |
Thomas Graf | 1797754 | 2005-06-18 22:53:48 -0700 | [diff] [blame] | 2676 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2677 | errout_skb: |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2678 | mutex_unlock(nlk->cb_mutex); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2679 | kfree_skb(skb); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2680 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2681 | } |
| 2682 | |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2683 | int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
| 2684 | const struct nlmsghdr *nlh, |
| 2685 | struct netlink_dump_control *control) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2686 | { |
| 2687 | struct netlink_callback *cb; |
| 2688 | struct sock *sk; |
| 2689 | struct netlink_sock *nlk; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2690 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2691 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2692 | /* Memory mapped dump requests need to be copied to avoid looping |
| 2693 | * on the pending state in netlink_mmap_sendmsg() while the CB hold |
| 2694 | * a reference to the skb. |
| 2695 | */ |
| 2696 | if (netlink_skb_is_mmaped(skb)) { |
| 2697 | skb = skb_copy(skb, GFP_KERNEL); |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2698 | if (skb == NULL) |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2699 | return -ENOBUFS; |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2700 | } else |
| 2701 | atomic_inc(&skb->users); |
| 2702 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2703 | sk = netlink_lookup(sock_net(ssk), ssk->sk_protocol, NETLINK_CB(skb).portid); |
| 2704 | if (sk == NULL) { |
| 2705 | ret = -ECONNREFUSED; |
| 2706 | goto error_free; |
| 2707 | } |
| 2708 | |
| 2709 | nlk = nlk_sk(sk); |
| 2710 | mutex_lock(nlk->cb_mutex); |
| 2711 | /* A dump is in progress... */ |
| 2712 | if (nlk->cb_running) { |
| 2713 | ret = -EBUSY; |
| 2714 | goto error_unlock; |
| 2715 | } |
| 2716 | /* add reference of module which cb->dump belongs to */ |
| 2717 | if (!try_module_get(control->module)) { |
| 2718 | ret = -EPROTONOSUPPORT; |
| 2719 | goto error_unlock; |
| 2720 | } |
| 2721 | |
| 2722 | cb = &nlk->cb; |
| 2723 | memset(cb, 0, sizeof(*cb)); |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 2724 | cb->dump = control->dump; |
| 2725 | cb->done = control->done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2726 | cb->nlh = nlh; |
Pablo Neira Ayuso | 7175c88 | 2012-02-24 14:30:16 +0000 | [diff] [blame] | 2727 | cb->data = control->data; |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2728 | cb->module = control->module; |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 2729 | cb->min_dump_alloc = control->min_dump_alloc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2730 | cb->skb = skb; |
| 2731 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2732 | nlk->cb_running = true; |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2733 | |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2734 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2735 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2736 | ret = netlink_dump(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2737 | sock_put(sk); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2738 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2739 | if (ret) |
| 2740 | return ret; |
| 2741 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2742 | /* We successfully started a dump, by returning -EINTR we |
| 2743 | * signal not to send ACK even if it was requested. |
| 2744 | */ |
| 2745 | return -EINTR; |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2746 | |
| 2747 | error_unlock: |
| 2748 | sock_put(sk); |
| 2749 | mutex_unlock(nlk->cb_mutex); |
| 2750 | error_free: |
| 2751 | kfree_skb(skb); |
| 2752 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2753 | } |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2754 | EXPORT_SYMBOL(__netlink_dump_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2755 | |
| 2756 | void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err) |
| 2757 | { |
| 2758 | struct sk_buff *skb; |
| 2759 | struct nlmsghdr *rep; |
| 2760 | struct nlmsgerr *errmsg; |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2761 | size_t payload = sizeof(*errmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2762 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2763 | /* error messages get the original request appened */ |
| 2764 | if (err) |
| 2765 | payload += nlmsg_len(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2766 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2767 | skb = netlink_alloc_skb(in_skb->sk, nlmsg_total_size(payload), |
| 2768 | NETLINK_CB(in_skb).portid, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2769 | if (!skb) { |
| 2770 | struct sock *sk; |
| 2771 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2772 | sk = netlink_lookup(sock_net(in_skb->sk), |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2773 | in_skb->sk->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2774 | NETLINK_CB(in_skb).portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2775 | if (sk) { |
| 2776 | sk->sk_err = ENOBUFS; |
| 2777 | sk->sk_error_report(sk); |
| 2778 | sock_put(sk); |
| 2779 | } |
| 2780 | return; |
| 2781 | } |
| 2782 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2783 | rep = __nlmsg_put(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
John Fastabend | 5dba93a | 2009-09-25 13:11:44 +0000 | [diff] [blame] | 2784 | NLMSG_ERROR, payload, 0); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2785 | errmsg = nlmsg_data(rep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2786 | errmsg->error = err; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2787 | memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(*nlh)); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2788 | 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] | 2789 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2790 | EXPORT_SYMBOL(netlink_ack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2791 | |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2792 | 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] | 2793 | struct nlmsghdr *)) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2794 | { |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2795 | struct nlmsghdr *nlh; |
| 2796 | int err; |
| 2797 | |
| 2798 | while (skb->len >= nlmsg_total_size(0)) { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2799 | int msglen; |
| 2800 | |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 2801 | nlh = nlmsg_hdr(skb); |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2802 | err = 0; |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2803 | |
Martin Murray | ad8e4b7 | 2006-01-10 13:02:29 -0800 | [diff] [blame] | 2804 | if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2805 | return 0; |
| 2806 | |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2807 | /* Only requests are handled by the kernel */ |
| 2808 | if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2809 | goto ack; |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2810 | |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 2811 | /* Skip control messages */ |
| 2812 | if (nlh->nlmsg_type < NLMSG_MIN_TYPE) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2813 | goto ack; |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 2814 | |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 2815 | err = cb(skb, nlh); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2816 | if (err == -EINTR) |
| 2817 | goto skip; |
| 2818 | |
| 2819 | ack: |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2820 | if (nlh->nlmsg_flags & NLM_F_ACK || err) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2821 | netlink_ack(skb, nlh, err); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2822 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2823 | skip: |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2824 | msglen = NLMSG_ALIGN(nlh->nlmsg_len); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2825 | if (msglen > skb->len) |
| 2826 | msglen = skb->len; |
| 2827 | skb_pull(skb, msglen); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2828 | } |
| 2829 | |
| 2830 | return 0; |
| 2831 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2832 | EXPORT_SYMBOL(netlink_rcv_skb); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2833 | |
| 2834 | /** |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2835 | * nlmsg_notify - send a notification netlink message |
| 2836 | * @sk: netlink socket to use |
| 2837 | * @skb: notification message |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2838 | * @portid: destination netlink portid for reports or 0 |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2839 | * @group: destination multicast group or 0 |
| 2840 | * @report: 1 to report back, 0 to disable |
| 2841 | * @flags: allocation flags |
| 2842 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2843 | int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2844 | unsigned int group, int report, gfp_t flags) |
| 2845 | { |
| 2846 | int err = 0; |
| 2847 | |
| 2848 | if (group) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2849 | int exclude_portid = 0; |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2850 | |
| 2851 | if (report) { |
| 2852 | atomic_inc(&skb->users); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2853 | exclude_portid = portid; |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2854 | } |
| 2855 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2856 | /* errors reported via destination sk->sk_err, but propagate |
| 2857 | * delivery errors if NETLINK_BROADCAST_ERROR flag is set */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2858 | err = nlmsg_multicast(sk, skb, exclude_portid, group, flags); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2859 | } |
| 2860 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2861 | if (report) { |
| 2862 | int err2; |
| 2863 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2864 | err2 = nlmsg_unicast(sk, skb, portid); |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2865 | if (!err || err == -ESRCH) |
| 2866 | err = err2; |
| 2867 | } |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2868 | |
| 2869 | return err; |
| 2870 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2871 | EXPORT_SYMBOL(nlmsg_notify); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2872 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2873 | #ifdef CONFIG_PROC_FS |
| 2874 | struct nl_seq_iter { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2875 | struct seq_net_private p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2876 | int link; |
| 2877 | int hash_idx; |
| 2878 | }; |
| 2879 | |
| 2880 | static struct sock *netlink_seq_socket_idx(struct seq_file *seq, loff_t pos) |
| 2881 | { |
| 2882 | struct nl_seq_iter *iter = seq->private; |
| 2883 | int i, j; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2884 | struct netlink_sock *nlk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2885 | struct sock *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2886 | loff_t off = 0; |
| 2887 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2888 | for (i = 0; i < MAX_LINKS; i++) { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2889 | struct rhashtable *ht = &nl_table[i].hash; |
Eric Dumazet | 67a24ac | 2014-08-05 07:50:07 +0200 | [diff] [blame] | 2890 | const struct bucket_table *tbl = rht_dereference_rcu(ht->tbl, ht); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2891 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2892 | for (j = 0; j < tbl->size; j++) { |
Thomas Graf | 88d6ed1 | 2015-01-02 23:00:16 +0100 | [diff] [blame] | 2893 | struct rhash_head *node; |
| 2894 | |
| 2895 | rht_for_each_entry_rcu(nlk, node, tbl, j, node) { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2896 | s = (struct sock *)nlk; |
| 2897 | |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2898 | if (sock_net(s) != seq_file_net(seq)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2899 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2900 | if (off == pos) { |
| 2901 | iter->link = i; |
| 2902 | iter->hash_idx = j; |
| 2903 | return s; |
| 2904 | } |
| 2905 | ++off; |
| 2906 | } |
| 2907 | } |
| 2908 | } |
| 2909 | return NULL; |
| 2910 | } |
| 2911 | |
| 2912 | static void *netlink_seq_start(struct seq_file *seq, loff_t *pos) |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2913 | __acquires(nl_table_lock) __acquires(RCU) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2914 | { |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2915 | read_lock(&nl_table_lock); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2916 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2917 | return *pos ? netlink_seq_socket_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
| 2918 | } |
| 2919 | |
| 2920 | static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2921 | { |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2922 | struct rhashtable *ht; |
Thomas Graf | 88d6ed1 | 2015-01-02 23:00:16 +0100 | [diff] [blame] | 2923 | const struct bucket_table *tbl; |
| 2924 | struct rhash_head *node; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2925 | struct netlink_sock *nlk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2926 | struct nl_seq_iter *iter; |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 2927 | struct net *net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2928 | int i, j; |
| 2929 | |
| 2930 | ++*pos; |
| 2931 | |
| 2932 | if (v == SEQ_START_TOKEN) |
| 2933 | return netlink_seq_socket_idx(seq, 0); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2934 | |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 2935 | net = seq_file_net(seq); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2936 | iter = seq->private; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2937 | nlk = v; |
| 2938 | |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2939 | i = iter->link; |
| 2940 | ht = &nl_table[i].hash; |
Thomas Graf | 88d6ed1 | 2015-01-02 23:00:16 +0100 | [diff] [blame] | 2941 | tbl = rht_dereference_rcu(ht->tbl, ht); |
| 2942 | rht_for_each_entry_rcu_continue(nlk, node, nlk->node.next, tbl, iter->hash_idx, node) |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2943 | if (net_eq(sock_net((struct sock *)nlk), net)) |
| 2944 | return nlk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2945 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2946 | j = iter->hash_idx + 1; |
| 2947 | |
| 2948 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2949 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2950 | for (; j < tbl->size; j++) { |
Thomas Graf | 88d6ed1 | 2015-01-02 23:00:16 +0100 | [diff] [blame] | 2951 | rht_for_each_entry_rcu(nlk, node, tbl, j, node) { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2952 | if (net_eq(sock_net((struct sock *)nlk), net)) { |
| 2953 | iter->link = i; |
| 2954 | iter->hash_idx = j; |
| 2955 | return nlk; |
| 2956 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2957 | } |
| 2958 | } |
| 2959 | |
| 2960 | j = 0; |
| 2961 | } while (++i < MAX_LINKS); |
| 2962 | |
| 2963 | return NULL; |
| 2964 | } |
| 2965 | |
| 2966 | static void netlink_seq_stop(struct seq_file *seq, void *v) |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2967 | __releases(RCU) __releases(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2968 | { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 2969 | rcu_read_unlock(); |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 2970 | read_unlock(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2971 | } |
| 2972 | |
| 2973 | |
| 2974 | static int netlink_seq_show(struct seq_file *seq, void *v) |
| 2975 | { |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2976 | if (v == SEQ_START_TOKEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2977 | seq_puts(seq, |
| 2978 | "sk Eth Pid Groups " |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 2979 | "Rmem Wmem Dump Locks Drops Inode\n"); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2980 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2981 | struct sock *s = v; |
| 2982 | struct netlink_sock *nlk = nlk_sk(s); |
| 2983 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2984 | seq_printf(seq, "%pK %-3d %-6u %08x %-8d %-8d %d %-8d %-8d %-8lu\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2985 | s, |
| 2986 | s->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2987 | nlk->portid, |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 2988 | nlk->groups ? (u32)nlk->groups[0] : 0, |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 2989 | sk_rmem_alloc_get(s), |
| 2990 | sk_wmem_alloc_get(s), |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2991 | nlk->cb_running, |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2992 | atomic_read(&s->sk_refcnt), |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 2993 | atomic_read(&s->sk_drops), |
| 2994 | sock_i_ino(s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2995 | ); |
| 2996 | |
| 2997 | } |
| 2998 | return 0; |
| 2999 | } |
| 3000 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 3001 | static const struct seq_operations netlink_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3002 | .start = netlink_seq_start, |
| 3003 | .next = netlink_seq_next, |
| 3004 | .stop = netlink_seq_stop, |
| 3005 | .show = netlink_seq_show, |
| 3006 | }; |
| 3007 | |
| 3008 | |
| 3009 | static int netlink_seq_open(struct inode *inode, struct file *file) |
| 3010 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3011 | return seq_open_net(inode, file, &netlink_seq_ops, |
| 3012 | sizeof(struct nl_seq_iter)); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3013 | } |
| 3014 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 3015 | static const struct file_operations netlink_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3016 | .owner = THIS_MODULE, |
| 3017 | .open = netlink_seq_open, |
| 3018 | .read = seq_read, |
| 3019 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3020 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3021 | }; |
| 3022 | |
| 3023 | #endif |
| 3024 | |
| 3025 | int netlink_register_notifier(struct notifier_block *nb) |
| 3026 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 3027 | return atomic_notifier_chain_register(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3028 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 3029 | EXPORT_SYMBOL(netlink_register_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3030 | |
| 3031 | int netlink_unregister_notifier(struct notifier_block *nb) |
| 3032 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 3033 | return atomic_notifier_chain_unregister(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3034 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 3035 | EXPORT_SYMBOL(netlink_unregister_notifier); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 3036 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 3037 | static const struct proto_ops netlink_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3038 | .family = PF_NETLINK, |
| 3039 | .owner = THIS_MODULE, |
| 3040 | .release = netlink_release, |
| 3041 | .bind = netlink_bind, |
| 3042 | .connect = netlink_connect, |
| 3043 | .socketpair = sock_no_socketpair, |
| 3044 | .accept = sock_no_accept, |
| 3045 | .getname = netlink_getname, |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 3046 | .poll = netlink_poll, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3047 | .ioctl = sock_no_ioctl, |
| 3048 | .listen = sock_no_listen, |
| 3049 | .shutdown = sock_no_shutdown, |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 3050 | .setsockopt = netlink_setsockopt, |
| 3051 | .getsockopt = netlink_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3052 | .sendmsg = netlink_sendmsg, |
| 3053 | .recvmsg = netlink_recvmsg, |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 3054 | .mmap = netlink_mmap, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3055 | .sendpage = sock_no_sendpage, |
| 3056 | }; |
| 3057 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 3058 | static const struct net_proto_family netlink_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3059 | .family = PF_NETLINK, |
| 3060 | .create = netlink_create, |
| 3061 | .owner = THIS_MODULE, /* for consistency 8) */ |
| 3062 | }; |
| 3063 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3064 | static int __net_init netlink_net_init(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3065 | { |
| 3066 | #ifdef CONFIG_PROC_FS |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 3067 | if (!proc_create("netlink", 0, net->proc_net, &netlink_seq_fops)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3068 | return -ENOMEM; |
| 3069 | #endif |
| 3070 | return 0; |
| 3071 | } |
| 3072 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3073 | static void __net_exit netlink_net_exit(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3074 | { |
| 3075 | #ifdef CONFIG_PROC_FS |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 3076 | remove_proc_entry("netlink", net->proc_net); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3077 | #endif |
| 3078 | } |
| 3079 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3080 | static void __init netlink_add_usersock_entry(void) |
| 3081 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3082 | struct listeners *listeners; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3083 | int groups = 32; |
| 3084 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3085 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3086 | if (!listeners) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3087 | panic("netlink_add_usersock_entry: Cannot allocate listeners\n"); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3088 | |
| 3089 | netlink_table_grab(); |
| 3090 | |
| 3091 | nl_table[NETLINK_USERSOCK].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3092 | rcu_assign_pointer(nl_table[NETLINK_USERSOCK].listeners, listeners); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3093 | nl_table[NETLINK_USERSOCK].module = THIS_MODULE; |
| 3094 | nl_table[NETLINK_USERSOCK].registered = 1; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 3095 | nl_table[NETLINK_USERSOCK].flags = NL_CFG_F_NONROOT_SEND; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3096 | |
| 3097 | netlink_table_ungrab(); |
| 3098 | } |
| 3099 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 3100 | static struct pernet_operations __net_initdata netlink_net_ops = { |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3101 | .init = netlink_net_init, |
| 3102 | .exit = netlink_net_exit, |
| 3103 | }; |
| 3104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3105 | static int __init netlink_proto_init(void) |
| 3106 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3107 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3108 | int err = proto_register(&netlink_proto, 0); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 3109 | struct rhashtable_params ht_params = { |
| 3110 | .head_offset = offsetof(struct netlink_sock, node), |
| 3111 | .key_offset = offsetof(struct netlink_sock, portid), |
| 3112 | .key_len = sizeof(u32), /* portid */ |
Daniel Borkmann | 7f19fc5 | 2014-12-10 16:33:10 +0100 | [diff] [blame] | 3113 | .hashfn = jhash, |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 3114 | .max_shift = 16, /* 64K */ |
| 3115 | .grow_decision = rht_grow_above_75, |
| 3116 | .shrink_decision = rht_shrink_below_30, |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 3117 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3118 | |
| 3119 | if (err != 0) |
| 3120 | goto out; |
| 3121 | |
YOSHIFUJI Hideaki / 吉藤英明 | fab2574 | 2013-01-09 07:19:48 +0000 | [diff] [blame] | 3122 | 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] | 3123 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 3124 | nl_table = kcalloc(MAX_LINKS, sizeof(*nl_table), GFP_KERNEL); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 3125 | if (!nl_table) |
| 3126 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3128 | for (i = 0; i < MAX_LINKS; i++) { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 3129 | if (rhashtable_init(&nl_table[i].hash, &ht_params) < 0) { |
| 3130 | while (--i > 0) |
| 3131 | rhashtable_destroy(&nl_table[i].hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3132 | kfree(nl_table); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 3133 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3134 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3135 | } |
| 3136 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 3137 | INIT_LIST_HEAD(&netlink_tap_all); |
| 3138 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3139 | netlink_add_usersock_entry(); |
| 3140 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3141 | sock_register(&netlink_family_ops); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3142 | register_pernet_subsys(&netlink_net_ops); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 3143 | /* The netlink device handler may be needed early. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3144 | rtnetlink_init(); |
| 3145 | out: |
| 3146 | return err; |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 3147 | panic: |
| 3148 | panic("netlink_init: Cannot allocate nl_table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3149 | } |
| 3150 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3151 | core_initcall(netlink_proto_init); |