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> |
Johannes Berg | ee1c2442 | 2015-01-16 11:37:14 +0100 | [diff] [blame] | 64 | #include <linux/genetlink.h> |
Andrew Morton | 54e0f52 | 2005-04-30 07:07:04 +0100 | [diff] [blame] | 65 | |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 66 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | #include <net/sock.h> |
| 68 | #include <net/scm.h> |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 69 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 71 | #include "af_netlink.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 73 | struct listeners { |
| 74 | struct rcu_head rcu; |
| 75 | unsigned long masks[0]; |
Johannes Berg | 6c04bb1 | 2009-07-10 09:51:32 +0000 | [diff] [blame] | 76 | }; |
| 77 | |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 78 | /* state bits */ |
| 79 | #define NETLINK_CONGESTED 0x0 |
| 80 | |
| 81 | /* flags */ |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 82 | #define NETLINK_KERNEL_SOCKET 0x1 |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 83 | #define NETLINK_RECV_PKTINFO 0x2 |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 84 | #define NETLINK_BROADCAST_SEND_ERROR 0x4 |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 85 | #define NETLINK_RECV_NO_ENOBUFS 0x8 |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 86 | |
David S. Miller | 035c4c1 | 2011-12-23 17:33:03 -0500 | [diff] [blame] | 87 | static inline int netlink_is_kernel(struct sock *sk) |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 88 | { |
| 89 | return nlk_sk(sk)->flags & NETLINK_KERNEL_SOCKET; |
| 90 | } |
| 91 | |
Eric Dumazet | 91dd93f | 2015-05-12 17:24:50 -0700 | [diff] [blame] | 92 | struct netlink_table *nl_table __read_mostly; |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 93 | EXPORT_SYMBOL_GPL(nl_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait); |
| 96 | |
| 97 | static int netlink_dump(struct sock *sk); |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 98 | static void netlink_skb_destructor(struct sk_buff *skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 100 | /* nl_table locking explained: |
Thomas Graf | 21e4902 | 2015-01-02 23:00:22 +0100 | [diff] [blame] | 101 | * Lookup and traversal are protected with an RCU read-side lock. Insertion |
Ying Xue | c5adde9 | 2015-01-12 14:52:23 +0800 | [diff] [blame] | 102 | * and removal are protected with per bucket lock while using RCU list |
Thomas Graf | 21e4902 | 2015-01-02 23:00:22 +0100 | [diff] [blame] | 103 | * modification primitives and may run in parallel to RCU protected lookups. |
| 104 | * Destruction of the Netlink socket may only occur *after* nl_table_lock has |
| 105 | * been acquired * either during or after the socket has been removed from |
| 106 | * the list and after an RCU grace period. |
Thomas Graf | 78fd1d0 | 2014-10-21 22:05:38 +0200 | [diff] [blame] | 107 | */ |
Andrey Vagin | 0f29c76 | 2013-03-21 20:33:47 +0400 | [diff] [blame] | 108 | DEFINE_RWLOCK(nl_table_lock); |
| 109 | EXPORT_SYMBOL_GPL(nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | static atomic_t nl_table_users = ATOMIC_INIT(0); |
| 111 | |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 112 | #define nl_deref_protected(X) rcu_dereference_protected(X, lockdep_is_held(&nl_table_lock)); |
| 113 | |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 114 | static ATOMIC_NOTIFIER_HEAD(netlink_chain); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 116 | static DEFINE_SPINLOCK(netlink_tap_lock); |
| 117 | static struct list_head netlink_tap_all __read_mostly; |
| 118 | |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 119 | static const struct rhashtable_params netlink_rhashtable_params; |
| 120 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 121 | static inline u32 netlink_group_mask(u32 group) |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 122 | { |
| 123 | return group ? 1 << (group - 1) : 0; |
| 124 | } |
| 125 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 126 | int netlink_add_tap(struct netlink_tap *nt) |
| 127 | { |
| 128 | if (unlikely(nt->dev->type != ARPHRD_NETLINK)) |
| 129 | return -EINVAL; |
| 130 | |
| 131 | spin_lock(&netlink_tap_lock); |
| 132 | list_add_rcu(&nt->list, &netlink_tap_all); |
| 133 | spin_unlock(&netlink_tap_lock); |
| 134 | |
Markus Elfring | fcd4d35 | 2014-11-18 21:03:13 +0100 | [diff] [blame] | 135 | __module_get(nt->module); |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | EXPORT_SYMBOL_GPL(netlink_add_tap); |
| 140 | |
stephen hemminger | 2173f8d | 2013-12-30 10:49:22 -0800 | [diff] [blame] | 141 | static int __netlink_remove_tap(struct netlink_tap *nt) |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 142 | { |
| 143 | bool found = false; |
| 144 | struct netlink_tap *tmp; |
| 145 | |
| 146 | spin_lock(&netlink_tap_lock); |
| 147 | |
| 148 | list_for_each_entry(tmp, &netlink_tap_all, list) { |
| 149 | if (nt == tmp) { |
| 150 | list_del_rcu(&nt->list); |
| 151 | found = true; |
| 152 | goto out; |
| 153 | } |
| 154 | } |
| 155 | |
| 156 | pr_warn("__netlink_remove_tap: %p not found\n", nt); |
| 157 | out: |
| 158 | spin_unlock(&netlink_tap_lock); |
| 159 | |
| 160 | if (found && nt->module) |
| 161 | module_put(nt->module); |
| 162 | |
| 163 | return found ? 0 : -ENODEV; |
| 164 | } |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 165 | |
| 166 | int netlink_remove_tap(struct netlink_tap *nt) |
| 167 | { |
| 168 | int ret; |
| 169 | |
| 170 | ret = __netlink_remove_tap(nt); |
| 171 | synchronize_net(); |
| 172 | |
| 173 | return ret; |
| 174 | } |
| 175 | EXPORT_SYMBOL_GPL(netlink_remove_tap); |
| 176 | |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 177 | static bool netlink_filter_tap(const struct sk_buff *skb) |
| 178 | { |
| 179 | struct sock *sk = skb->sk; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 180 | |
| 181 | /* We take the more conservative approach and |
| 182 | * whitelist socket protocols that may pass. |
| 183 | */ |
| 184 | switch (sk->sk_protocol) { |
| 185 | case NETLINK_ROUTE: |
| 186 | case NETLINK_USERSOCK: |
| 187 | case NETLINK_SOCK_DIAG: |
| 188 | case NETLINK_NFLOG: |
| 189 | case NETLINK_XFRM: |
| 190 | case NETLINK_FIB_LOOKUP: |
| 191 | case NETLINK_NETFILTER: |
| 192 | case NETLINK_GENERIC: |
Varka Bhadram | 498044b | 2014-07-16 10:59:47 +0530 | [diff] [blame] | 193 | return true; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 194 | } |
| 195 | |
Varka Bhadram | 498044b | 2014-07-16 10:59:47 +0530 | [diff] [blame] | 196 | return false; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 197 | } |
| 198 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 199 | static int __netlink_deliver_tap_skb(struct sk_buff *skb, |
| 200 | struct net_device *dev) |
| 201 | { |
| 202 | struct sk_buff *nskb; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 203 | struct sock *sk = skb->sk; |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 204 | int ret = -ENOMEM; |
| 205 | |
| 206 | dev_hold(dev); |
| 207 | nskb = skb_clone(skb, GFP_ATOMIC); |
| 208 | if (nskb) { |
| 209 | nskb->dev = dev; |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 210 | nskb->protocol = htons((u16) sk->sk_protocol); |
Daniel Borkmann | 604d13c | 2013-12-23 14:35:56 +0100 | [diff] [blame] | 211 | nskb->pkt_type = netlink_is_kernel(sk) ? |
| 212 | PACKET_KERNEL : PACKET_USER; |
Daniel Borkmann | 4e48ed8 | 2014-08-07 22:22:47 +0200 | [diff] [blame] | 213 | skb_reset_network_header(nskb); |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 214 | ret = dev_queue_xmit(nskb); |
| 215 | if (unlikely(ret > 0)) |
| 216 | ret = net_xmit_errno(ret); |
| 217 | } |
| 218 | |
| 219 | dev_put(dev); |
| 220 | return ret; |
| 221 | } |
| 222 | |
| 223 | static void __netlink_deliver_tap(struct sk_buff *skb) |
| 224 | { |
| 225 | int ret; |
| 226 | struct netlink_tap *tmp; |
| 227 | |
Daniel Borkmann | 5ffd5cd | 2013-09-05 17:48:47 +0200 | [diff] [blame] | 228 | if (!netlink_filter_tap(skb)) |
| 229 | return; |
| 230 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 231 | list_for_each_entry_rcu(tmp, &netlink_tap_all, list) { |
| 232 | ret = __netlink_deliver_tap_skb(skb, tmp->dev); |
| 233 | if (unlikely(ret)) |
| 234 | break; |
| 235 | } |
| 236 | } |
| 237 | |
| 238 | static void netlink_deliver_tap(struct sk_buff *skb) |
| 239 | { |
| 240 | rcu_read_lock(); |
| 241 | |
| 242 | if (unlikely(!list_empty(&netlink_tap_all))) |
| 243 | __netlink_deliver_tap(skb); |
| 244 | |
| 245 | rcu_read_unlock(); |
| 246 | } |
| 247 | |
Daniel Borkmann | 73bfd37 | 2013-12-23 14:35:55 +0100 | [diff] [blame] | 248 | static void netlink_deliver_tap_kernel(struct sock *dst, struct sock *src, |
| 249 | struct sk_buff *skb) |
| 250 | { |
| 251 | if (!(netlink_is_kernel(dst) && netlink_is_kernel(src))) |
| 252 | netlink_deliver_tap(skb); |
| 253 | } |
| 254 | |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 255 | static void netlink_overrun(struct sock *sk) |
| 256 | { |
| 257 | struct netlink_sock *nlk = nlk_sk(sk); |
| 258 | |
| 259 | if (!(nlk->flags & NETLINK_RECV_NO_ENOBUFS)) { |
| 260 | if (!test_and_set_bit(NETLINK_CONGESTED, &nlk_sk(sk)->state)) { |
| 261 | sk->sk_err = ENOBUFS; |
| 262 | sk->sk_error_report(sk); |
| 263 | } |
| 264 | } |
| 265 | atomic_inc(&sk->sk_drops); |
| 266 | } |
| 267 | |
| 268 | static void netlink_rcv_wake(struct sock *sk) |
| 269 | { |
| 270 | struct netlink_sock *nlk = nlk_sk(sk); |
| 271 | |
| 272 | if (skb_queue_empty(&sk->sk_receive_queue)) |
| 273 | clear_bit(NETLINK_CONGESTED, &nlk->state); |
| 274 | if (!test_bit(NETLINK_CONGESTED, &nlk->state)) |
| 275 | wake_up_interruptible(&nlk->wait); |
| 276 | } |
| 277 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 278 | #ifdef CONFIG_NETLINK_MMAP |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 279 | static bool netlink_skb_is_mmaped(const struct sk_buff *skb) |
| 280 | { |
| 281 | return NETLINK_CB(skb).flags & NETLINK_SKB_MMAPED; |
| 282 | } |
| 283 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 284 | static bool netlink_rx_is_mmaped(struct sock *sk) |
| 285 | { |
| 286 | return nlk_sk(sk)->rx_ring.pg_vec != NULL; |
| 287 | } |
| 288 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 289 | static bool netlink_tx_is_mmaped(struct sock *sk) |
| 290 | { |
| 291 | return nlk_sk(sk)->tx_ring.pg_vec != NULL; |
| 292 | } |
| 293 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 294 | static __pure struct page *pgvec_to_page(const void *addr) |
| 295 | { |
| 296 | if (is_vmalloc_addr(addr)) |
| 297 | return vmalloc_to_page(addr); |
| 298 | else |
| 299 | return virt_to_page(addr); |
| 300 | } |
| 301 | |
| 302 | static void free_pg_vec(void **pg_vec, unsigned int order, unsigned int len) |
| 303 | { |
| 304 | unsigned int i; |
| 305 | |
| 306 | for (i = 0; i < len; i++) { |
| 307 | if (pg_vec[i] != NULL) { |
| 308 | if (is_vmalloc_addr(pg_vec[i])) |
| 309 | vfree(pg_vec[i]); |
| 310 | else |
| 311 | free_pages((unsigned long)pg_vec[i], order); |
| 312 | } |
| 313 | } |
| 314 | kfree(pg_vec); |
| 315 | } |
| 316 | |
| 317 | static void *alloc_one_pg_vec_page(unsigned long order) |
| 318 | { |
| 319 | void *buffer; |
| 320 | gfp_t gfp_flags = GFP_KERNEL | __GFP_COMP | __GFP_ZERO | |
| 321 | __GFP_NOWARN | __GFP_NORETRY; |
| 322 | |
| 323 | buffer = (void *)__get_free_pages(gfp_flags, order); |
| 324 | if (buffer != NULL) |
| 325 | return buffer; |
| 326 | |
| 327 | buffer = vzalloc((1 << order) * PAGE_SIZE); |
| 328 | if (buffer != NULL) |
| 329 | return buffer; |
| 330 | |
| 331 | gfp_flags &= ~__GFP_NORETRY; |
| 332 | return (void *)__get_free_pages(gfp_flags, order); |
| 333 | } |
| 334 | |
| 335 | static void **alloc_pg_vec(struct netlink_sock *nlk, |
| 336 | struct nl_mmap_req *req, unsigned int order) |
| 337 | { |
| 338 | unsigned int block_nr = req->nm_block_nr; |
| 339 | unsigned int i; |
Daniel Borkmann | 8a849bb | 2013-08-02 17:32:39 +0200 | [diff] [blame] | 340 | void **pg_vec; |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 341 | |
| 342 | pg_vec = kcalloc(block_nr, sizeof(void *), GFP_KERNEL); |
| 343 | if (pg_vec == NULL) |
| 344 | return NULL; |
| 345 | |
| 346 | for (i = 0; i < block_nr; i++) { |
Daniel Borkmann | 8a849bb | 2013-08-02 17:32:39 +0200 | [diff] [blame] | 347 | pg_vec[i] = alloc_one_pg_vec_page(order); |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 348 | if (pg_vec[i] == NULL) |
| 349 | goto err1; |
| 350 | } |
| 351 | |
| 352 | return pg_vec; |
| 353 | err1: |
| 354 | free_pg_vec(pg_vec, order, block_nr); |
| 355 | return NULL; |
| 356 | } |
| 357 | |
| 358 | static int netlink_set_ring(struct sock *sk, struct nl_mmap_req *req, |
| 359 | bool closing, bool tx_ring) |
| 360 | { |
| 361 | struct netlink_sock *nlk = nlk_sk(sk); |
| 362 | struct netlink_ring *ring; |
| 363 | struct sk_buff_head *queue; |
| 364 | void **pg_vec = NULL; |
| 365 | unsigned int order = 0; |
| 366 | int err; |
| 367 | |
| 368 | ring = tx_ring ? &nlk->tx_ring : &nlk->rx_ring; |
| 369 | queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue; |
| 370 | |
| 371 | if (!closing) { |
| 372 | if (atomic_read(&nlk->mapped)) |
| 373 | return -EBUSY; |
| 374 | if (atomic_read(&ring->pending)) |
| 375 | return -EBUSY; |
| 376 | } |
| 377 | |
| 378 | if (req->nm_block_nr) { |
| 379 | if (ring->pg_vec != NULL) |
| 380 | return -EBUSY; |
| 381 | |
| 382 | if ((int)req->nm_block_size <= 0) |
| 383 | return -EINVAL; |
Tobias Klauser | 74e83b2 | 2014-07-31 12:17:08 +0200 | [diff] [blame] | 384 | if (!PAGE_ALIGNED(req->nm_block_size)) |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 385 | return -EINVAL; |
| 386 | if (req->nm_frame_size < NL_MMAP_HDRLEN) |
| 387 | return -EINVAL; |
| 388 | if (!IS_ALIGNED(req->nm_frame_size, NL_MMAP_MSG_ALIGNMENT)) |
| 389 | return -EINVAL; |
| 390 | |
| 391 | ring->frames_per_block = req->nm_block_size / |
| 392 | req->nm_frame_size; |
| 393 | if (ring->frames_per_block == 0) |
| 394 | return -EINVAL; |
| 395 | if (ring->frames_per_block * req->nm_block_nr != |
| 396 | req->nm_frame_nr) |
| 397 | return -EINVAL; |
| 398 | |
| 399 | order = get_order(req->nm_block_size); |
| 400 | pg_vec = alloc_pg_vec(nlk, req, order); |
| 401 | if (pg_vec == NULL) |
| 402 | return -ENOMEM; |
| 403 | } else { |
| 404 | if (req->nm_frame_nr) |
| 405 | return -EINVAL; |
| 406 | } |
| 407 | |
| 408 | err = -EBUSY; |
| 409 | mutex_lock(&nlk->pg_vec_lock); |
| 410 | if (closing || atomic_read(&nlk->mapped) == 0) { |
| 411 | err = 0; |
| 412 | spin_lock_bh(&queue->lock); |
| 413 | |
| 414 | ring->frame_max = req->nm_frame_nr - 1; |
| 415 | ring->head = 0; |
| 416 | ring->frame_size = req->nm_frame_size; |
| 417 | ring->pg_vec_pages = req->nm_block_size / PAGE_SIZE; |
| 418 | |
| 419 | swap(ring->pg_vec_len, req->nm_block_nr); |
| 420 | swap(ring->pg_vec_order, order); |
| 421 | swap(ring->pg_vec, pg_vec); |
| 422 | |
| 423 | __skb_queue_purge(queue); |
| 424 | spin_unlock_bh(&queue->lock); |
| 425 | |
| 426 | WARN_ON(atomic_read(&nlk->mapped)); |
| 427 | } |
| 428 | mutex_unlock(&nlk->pg_vec_lock); |
| 429 | |
| 430 | if (pg_vec) |
| 431 | free_pg_vec(pg_vec, order, req->nm_block_nr); |
| 432 | return err; |
| 433 | } |
| 434 | |
| 435 | static void netlink_mm_open(struct vm_area_struct *vma) |
| 436 | { |
| 437 | struct file *file = vma->vm_file; |
| 438 | struct socket *sock = file->private_data; |
| 439 | struct sock *sk = sock->sk; |
| 440 | |
| 441 | if (sk) |
| 442 | atomic_inc(&nlk_sk(sk)->mapped); |
| 443 | } |
| 444 | |
| 445 | static void netlink_mm_close(struct vm_area_struct *vma) |
| 446 | { |
| 447 | struct file *file = vma->vm_file; |
| 448 | struct socket *sock = file->private_data; |
| 449 | struct sock *sk = sock->sk; |
| 450 | |
| 451 | if (sk) |
| 452 | atomic_dec(&nlk_sk(sk)->mapped); |
| 453 | } |
| 454 | |
| 455 | static const struct vm_operations_struct netlink_mmap_ops = { |
| 456 | .open = netlink_mm_open, |
| 457 | .close = netlink_mm_close, |
| 458 | }; |
| 459 | |
| 460 | static int netlink_mmap(struct file *file, struct socket *sock, |
| 461 | struct vm_area_struct *vma) |
| 462 | { |
| 463 | struct sock *sk = sock->sk; |
| 464 | struct netlink_sock *nlk = nlk_sk(sk); |
| 465 | struct netlink_ring *ring; |
| 466 | unsigned long start, size, expected; |
| 467 | unsigned int i; |
| 468 | int err = -EINVAL; |
| 469 | |
| 470 | if (vma->vm_pgoff) |
| 471 | return -EINVAL; |
| 472 | |
| 473 | mutex_lock(&nlk->pg_vec_lock); |
| 474 | |
| 475 | expected = 0; |
| 476 | for (ring = &nlk->rx_ring; ring <= &nlk->tx_ring; ring++) { |
| 477 | if (ring->pg_vec == NULL) |
| 478 | continue; |
| 479 | expected += ring->pg_vec_len * ring->pg_vec_pages * PAGE_SIZE; |
| 480 | } |
| 481 | |
| 482 | if (expected == 0) |
| 483 | goto out; |
| 484 | |
| 485 | size = vma->vm_end - vma->vm_start; |
| 486 | if (size != expected) |
| 487 | goto out; |
| 488 | |
| 489 | start = vma->vm_start; |
| 490 | for (ring = &nlk->rx_ring; ring <= &nlk->tx_ring; ring++) { |
| 491 | if (ring->pg_vec == NULL) |
| 492 | continue; |
| 493 | |
| 494 | for (i = 0; i < ring->pg_vec_len; i++) { |
| 495 | struct page *page; |
| 496 | void *kaddr = ring->pg_vec[i]; |
| 497 | unsigned int pg_num; |
| 498 | |
| 499 | for (pg_num = 0; pg_num < ring->pg_vec_pages; pg_num++) { |
| 500 | page = pgvec_to_page(kaddr); |
| 501 | err = vm_insert_page(vma, start, page); |
| 502 | if (err < 0) |
| 503 | goto out; |
| 504 | start += PAGE_SIZE; |
| 505 | kaddr += PAGE_SIZE; |
| 506 | } |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | atomic_inc(&nlk->mapped); |
| 511 | vma->vm_ops = &netlink_mmap_ops; |
| 512 | err = 0; |
| 513 | out: |
| 514 | mutex_unlock(&nlk->pg_vec_lock); |
Patrick McHardy | 7cdbac7 | 2013-06-11 02:52:47 -0700 | [diff] [blame] | 515 | return err; |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 516 | } |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 517 | |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 518 | 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] | 519 | { |
| 520 | #if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 1 |
| 521 | struct page *p_start, *p_end; |
| 522 | |
| 523 | /* First page is flushed through netlink_{get,set}_status */ |
| 524 | p_start = pgvec_to_page(hdr + PAGE_SIZE); |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 525 | 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] | 526 | while (p_start <= p_end) { |
| 527 | flush_dcache_page(p_start); |
| 528 | p_start++; |
| 529 | } |
| 530 | #endif |
| 531 | } |
| 532 | |
| 533 | static enum nl_mmap_status netlink_get_status(const struct nl_mmap_hdr *hdr) |
| 534 | { |
| 535 | smp_rmb(); |
| 536 | flush_dcache_page(pgvec_to_page(hdr)); |
| 537 | return hdr->nm_status; |
| 538 | } |
| 539 | |
| 540 | static void netlink_set_status(struct nl_mmap_hdr *hdr, |
| 541 | enum nl_mmap_status status) |
| 542 | { |
Thomas Graf | a18e6a1 | 2014-12-18 10:30:26 +0000 | [diff] [blame] | 543 | smp_mb(); |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 544 | hdr->nm_status = status; |
| 545 | flush_dcache_page(pgvec_to_page(hdr)); |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 546 | } |
| 547 | |
| 548 | static struct nl_mmap_hdr * |
| 549 | __netlink_lookup_frame(const struct netlink_ring *ring, unsigned int pos) |
| 550 | { |
| 551 | unsigned int pg_vec_pos, frame_off; |
| 552 | |
| 553 | pg_vec_pos = pos / ring->frames_per_block; |
| 554 | frame_off = pos % ring->frames_per_block; |
| 555 | |
| 556 | return ring->pg_vec[pg_vec_pos] + (frame_off * ring->frame_size); |
| 557 | } |
| 558 | |
| 559 | static struct nl_mmap_hdr * |
| 560 | netlink_lookup_frame(const struct netlink_ring *ring, unsigned int pos, |
| 561 | enum nl_mmap_status status) |
| 562 | { |
| 563 | struct nl_mmap_hdr *hdr; |
| 564 | |
| 565 | hdr = __netlink_lookup_frame(ring, pos); |
| 566 | if (netlink_get_status(hdr) != status) |
| 567 | return NULL; |
| 568 | |
| 569 | return hdr; |
| 570 | } |
| 571 | |
| 572 | static struct nl_mmap_hdr * |
| 573 | netlink_current_frame(const struct netlink_ring *ring, |
| 574 | enum nl_mmap_status status) |
| 575 | { |
| 576 | return netlink_lookup_frame(ring, ring->head, status); |
| 577 | } |
| 578 | |
| 579 | static struct nl_mmap_hdr * |
| 580 | netlink_previous_frame(const struct netlink_ring *ring, |
| 581 | enum nl_mmap_status status) |
| 582 | { |
| 583 | unsigned int prev; |
| 584 | |
| 585 | prev = ring->head ? ring->head - 1 : ring->frame_max; |
| 586 | return netlink_lookup_frame(ring, prev, status); |
| 587 | } |
| 588 | |
| 589 | static void netlink_increment_head(struct netlink_ring *ring) |
| 590 | { |
| 591 | ring->head = ring->head != ring->frame_max ? ring->head + 1 : 0; |
| 592 | } |
| 593 | |
| 594 | static void netlink_forward_ring(struct netlink_ring *ring) |
| 595 | { |
| 596 | unsigned int head = ring->head, pos = head; |
| 597 | const struct nl_mmap_hdr *hdr; |
| 598 | |
| 599 | do { |
| 600 | hdr = __netlink_lookup_frame(ring, pos); |
| 601 | if (hdr->nm_status == NL_MMAP_STATUS_UNUSED) |
| 602 | break; |
| 603 | if (hdr->nm_status != NL_MMAP_STATUS_SKIP) |
| 604 | break; |
| 605 | netlink_increment_head(ring); |
| 606 | } while (ring->head != head); |
| 607 | } |
| 608 | |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 609 | static bool netlink_dump_space(struct netlink_sock *nlk) |
| 610 | { |
| 611 | struct netlink_ring *ring = &nlk->rx_ring; |
| 612 | struct nl_mmap_hdr *hdr; |
| 613 | unsigned int n; |
| 614 | |
| 615 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED); |
| 616 | if (hdr == NULL) |
| 617 | return false; |
| 618 | |
| 619 | n = ring->head + ring->frame_max / 2; |
| 620 | if (n > ring->frame_max) |
| 621 | n -= ring->frame_max; |
| 622 | |
| 623 | hdr = __netlink_lookup_frame(ring, n); |
| 624 | |
| 625 | return hdr->nm_status == NL_MMAP_STATUS_UNUSED; |
| 626 | } |
| 627 | |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 628 | static unsigned int netlink_poll(struct file *file, struct socket *sock, |
| 629 | poll_table *wait) |
| 630 | { |
| 631 | struct sock *sk = sock->sk; |
| 632 | struct netlink_sock *nlk = nlk_sk(sk); |
| 633 | unsigned int mask; |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 634 | int err; |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 635 | |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 636 | if (nlk->rx_ring.pg_vec != NULL) { |
| 637 | /* Memory mapped sockets don't call recvmsg(), so flow control |
| 638 | * for dumps is performed here. A dump is allowed to continue |
| 639 | * if at least half the ring is unused. |
| 640 | */ |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 641 | while (nlk->cb_running && netlink_dump_space(nlk)) { |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 642 | err = netlink_dump(sk); |
| 643 | if (err < 0) { |
Ben Pfaff | ac30ef8 | 2014-07-09 10:31:22 -0700 | [diff] [blame] | 644 | sk->sk_err = -err; |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 645 | sk->sk_error_report(sk); |
| 646 | break; |
| 647 | } |
| 648 | } |
| 649 | netlink_rcv_wake(sk); |
| 650 | } |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 651 | |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 652 | mask = datagram_poll(file, sock, wait); |
| 653 | |
| 654 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 655 | if (nlk->rx_ring.pg_vec) { |
| 656 | netlink_forward_ring(&nlk->rx_ring); |
| 657 | if (!netlink_previous_frame(&nlk->rx_ring, NL_MMAP_STATUS_UNUSED)) |
| 658 | mask |= POLLIN | POLLRDNORM; |
| 659 | } |
| 660 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 661 | |
| 662 | spin_lock_bh(&sk->sk_write_queue.lock); |
| 663 | if (nlk->tx_ring.pg_vec) { |
| 664 | if (netlink_current_frame(&nlk->tx_ring, NL_MMAP_STATUS_UNUSED)) |
| 665 | mask |= POLLOUT | POLLWRNORM; |
| 666 | } |
| 667 | spin_unlock_bh(&sk->sk_write_queue.lock); |
| 668 | |
| 669 | return mask; |
| 670 | } |
| 671 | |
| 672 | static struct nl_mmap_hdr *netlink_mmap_hdr(struct sk_buff *skb) |
| 673 | { |
| 674 | return (struct nl_mmap_hdr *)(skb->head - NL_MMAP_HDRLEN); |
| 675 | } |
| 676 | |
| 677 | static void netlink_ring_setup_skb(struct sk_buff *skb, struct sock *sk, |
| 678 | struct netlink_ring *ring, |
| 679 | struct nl_mmap_hdr *hdr) |
| 680 | { |
| 681 | unsigned int size; |
| 682 | void *data; |
| 683 | |
| 684 | size = ring->frame_size - NL_MMAP_HDRLEN; |
| 685 | data = (void *)hdr + NL_MMAP_HDRLEN; |
| 686 | |
| 687 | skb->head = data; |
| 688 | skb->data = data; |
| 689 | skb_reset_tail_pointer(skb); |
| 690 | skb->end = skb->tail + size; |
| 691 | skb->len = 0; |
| 692 | |
| 693 | skb->destructor = netlink_skb_destructor; |
| 694 | NETLINK_CB(skb).flags |= NETLINK_SKB_MMAPED; |
| 695 | NETLINK_CB(skb).sk = sk; |
| 696 | } |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 697 | |
| 698 | static int netlink_mmap_sendmsg(struct sock *sk, struct msghdr *msg, |
| 699 | u32 dst_portid, u32 dst_group, |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 700 | struct scm_cookie *scm) |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 701 | { |
| 702 | struct netlink_sock *nlk = nlk_sk(sk); |
| 703 | struct netlink_ring *ring; |
| 704 | struct nl_mmap_hdr *hdr; |
| 705 | struct sk_buff *skb; |
| 706 | unsigned int maxlen; |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 707 | int err = 0, len = 0; |
| 708 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 709 | mutex_lock(&nlk->pg_vec_lock); |
| 710 | |
| 711 | ring = &nlk->tx_ring; |
| 712 | maxlen = ring->frame_size - NL_MMAP_HDRLEN; |
| 713 | |
| 714 | do { |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 715 | unsigned int nm_len; |
| 716 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 717 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_VALID); |
| 718 | if (hdr == NULL) { |
| 719 | if (!(msg->msg_flags & MSG_DONTWAIT) && |
| 720 | atomic_read(&nlk->tx_ring.pending)) |
| 721 | schedule(); |
| 722 | continue; |
| 723 | } |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 724 | |
| 725 | nm_len = ACCESS_ONCE(hdr->nm_len); |
| 726 | if (nm_len > maxlen) { |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 727 | err = -EINVAL; |
| 728 | goto out; |
| 729 | } |
| 730 | |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 731 | netlink_frame_flush_dcache(hdr, nm_len); |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 732 | |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 733 | skb = alloc_skb(nm_len, GFP_KERNEL); |
| 734 | if (skb == NULL) { |
| 735 | err = -ENOBUFS; |
| 736 | goto out; |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 737 | } |
David Miller | 4682a03 | 2014-12-16 17:58:17 -0500 | [diff] [blame] | 738 | __skb_put(skb, nm_len); |
| 739 | memcpy(skb->data, (void *)hdr + NL_MMAP_HDRLEN, nm_len); |
| 740 | netlink_set_status(hdr, NL_MMAP_STATUS_UNUSED); |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 741 | |
| 742 | netlink_increment_head(ring); |
| 743 | |
| 744 | NETLINK_CB(skb).portid = nlk->portid; |
| 745 | NETLINK_CB(skb).dst_group = dst_group; |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 746 | NETLINK_CB(skb).creds = scm->creds; |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 747 | |
| 748 | err = security_netlink_send(sk, skb); |
| 749 | if (err) { |
| 750 | kfree_skb(skb); |
| 751 | goto out; |
| 752 | } |
| 753 | |
| 754 | if (unlikely(dst_group)) { |
| 755 | atomic_inc(&skb->users); |
| 756 | netlink_broadcast(sk, skb, dst_portid, dst_group, |
| 757 | GFP_KERNEL); |
| 758 | } |
| 759 | err = netlink_unicast(sk, skb, dst_portid, |
| 760 | msg->msg_flags & MSG_DONTWAIT); |
| 761 | if (err < 0) |
| 762 | goto out; |
| 763 | len += err; |
| 764 | |
| 765 | } while (hdr != NULL || |
| 766 | (!(msg->msg_flags & MSG_DONTWAIT) && |
| 767 | atomic_read(&nlk->tx_ring.pending))); |
| 768 | |
| 769 | if (len > 0) |
| 770 | err = len; |
| 771 | out: |
| 772 | mutex_unlock(&nlk->pg_vec_lock); |
| 773 | return err; |
| 774 | } |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 775 | |
| 776 | static void netlink_queue_mmaped_skb(struct sock *sk, struct sk_buff *skb) |
| 777 | { |
| 778 | struct nl_mmap_hdr *hdr; |
| 779 | |
| 780 | hdr = netlink_mmap_hdr(skb); |
| 781 | hdr->nm_len = skb->len; |
| 782 | hdr->nm_group = NETLINK_CB(skb).dst_group; |
| 783 | hdr->nm_pid = NETLINK_CB(skb).creds.pid; |
Nicolas Dichtel | 1bf9310 | 2013-04-24 10:36:23 +0200 | [diff] [blame] | 784 | hdr->nm_uid = from_kuid(sk_user_ns(sk), NETLINK_CB(skb).creds.uid); |
| 785 | 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] | 786 | netlink_frame_flush_dcache(hdr, hdr->nm_len); |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 787 | netlink_set_status(hdr, NL_MMAP_STATUS_VALID); |
| 788 | |
| 789 | NETLINK_CB(skb).flags |= NETLINK_SKB_DELIVERED; |
| 790 | kfree_skb(skb); |
| 791 | } |
| 792 | |
| 793 | static void netlink_ring_set_copied(struct sock *sk, struct sk_buff *skb) |
| 794 | { |
| 795 | struct netlink_sock *nlk = nlk_sk(sk); |
| 796 | struct netlink_ring *ring = &nlk->rx_ring; |
| 797 | struct nl_mmap_hdr *hdr; |
| 798 | |
| 799 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 800 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED); |
| 801 | if (hdr == NULL) { |
| 802 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 803 | kfree_skb(skb); |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 804 | netlink_overrun(sk); |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 805 | return; |
| 806 | } |
| 807 | netlink_increment_head(ring); |
| 808 | __skb_queue_tail(&sk->sk_receive_queue, skb); |
| 809 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 810 | |
| 811 | hdr->nm_len = skb->len; |
| 812 | hdr->nm_group = NETLINK_CB(skb).dst_group; |
| 813 | hdr->nm_pid = NETLINK_CB(skb).creds.pid; |
Nicolas Dichtel | 1bf9310 | 2013-04-24 10:36:23 +0200 | [diff] [blame] | 814 | hdr->nm_uid = from_kuid(sk_user_ns(sk), NETLINK_CB(skb).creds.uid); |
| 815 | 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] | 816 | netlink_set_status(hdr, NL_MMAP_STATUS_COPY); |
| 817 | } |
| 818 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 819 | #else /* CONFIG_NETLINK_MMAP */ |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 820 | #define netlink_skb_is_mmaped(skb) false |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 821 | #define netlink_rx_is_mmaped(sk) false |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 822 | #define netlink_tx_is_mmaped(sk) false |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 823 | #define netlink_mmap sock_no_mmap |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 824 | #define netlink_poll datagram_poll |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 825 | #define netlink_mmap_sendmsg(sk, msg, dst_portid, dst_group, scm) 0 |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 826 | #endif /* CONFIG_NETLINK_MMAP */ |
| 827 | |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 828 | static void netlink_skb_destructor(struct sk_buff *skb) |
| 829 | { |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 830 | #ifdef CONFIG_NETLINK_MMAP |
| 831 | struct nl_mmap_hdr *hdr; |
| 832 | struct netlink_ring *ring; |
| 833 | struct sock *sk; |
| 834 | |
| 835 | /* If a packet from the kernel to userspace was freed because of an |
| 836 | * error without being delivered to userspace, the kernel must reset |
| 837 | * the status. In the direction userspace to kernel, the status is |
| 838 | * always reset here after the packet was processed and freed. |
| 839 | */ |
| 840 | if (netlink_skb_is_mmaped(skb)) { |
| 841 | hdr = netlink_mmap_hdr(skb); |
| 842 | sk = NETLINK_CB(skb).sk; |
| 843 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 844 | if (NETLINK_CB(skb).flags & NETLINK_SKB_TX) { |
| 845 | netlink_set_status(hdr, NL_MMAP_STATUS_UNUSED); |
| 846 | ring = &nlk_sk(sk)->tx_ring; |
| 847 | } else { |
| 848 | if (!(NETLINK_CB(skb).flags & NETLINK_SKB_DELIVERED)) { |
| 849 | hdr->nm_len = 0; |
| 850 | netlink_set_status(hdr, NL_MMAP_STATUS_VALID); |
| 851 | } |
| 852 | ring = &nlk_sk(sk)->rx_ring; |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 853 | } |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 854 | |
| 855 | WARN_ON(atomic_read(&ring->pending) == 0); |
| 856 | atomic_dec(&ring->pending); |
| 857 | sock_put(sk); |
| 858 | |
Pablo Neira | 5e71d9d | 2013-06-03 09:28:43 +0000 | [diff] [blame] | 859 | skb->head = NULL; |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 860 | } |
| 861 | #endif |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 862 | if (is_vmalloc_addr(skb->head)) { |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 863 | if (!skb->cloned || |
| 864 | !atomic_dec_return(&(skb_shinfo(skb)->dataref))) |
| 865 | vfree(skb->head); |
| 866 | |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 867 | skb->head = NULL; |
| 868 | } |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 869 | if (skb->sk != NULL) |
| 870 | sock_rfree(skb); |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 871 | } |
| 872 | |
| 873 | static void netlink_skb_set_owner_r(struct sk_buff *skb, struct sock *sk) |
| 874 | { |
| 875 | WARN_ON(skb->sk != NULL); |
| 876 | skb->sk = sk; |
| 877 | skb->destructor = netlink_skb_destructor; |
| 878 | atomic_add(skb->truesize, &sk->sk_rmem_alloc); |
| 879 | sk_mem_charge(sk, skb->truesize); |
| 880 | } |
| 881 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | static void netlink_sock_destruct(struct sock *sk) |
| 883 | { |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 884 | struct netlink_sock *nlk = nlk_sk(sk); |
| 885 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 886 | if (nlk->cb_running) { |
| 887 | if (nlk->cb.done) |
| 888 | nlk->cb.done(&nlk->cb); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 889 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 890 | module_put(nlk->cb.module); |
| 891 | kfree_skb(nlk->cb.skb); |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 892 | } |
| 893 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | skb_queue_purge(&sk->sk_receive_queue); |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 895 | #ifdef CONFIG_NETLINK_MMAP |
| 896 | if (1) { |
| 897 | struct nl_mmap_req req; |
| 898 | |
| 899 | memset(&req, 0, sizeof(req)); |
| 900 | if (nlk->rx_ring.pg_vec) |
| 901 | netlink_set_ring(sk, &req, true, false); |
| 902 | memset(&req, 0, sizeof(req)); |
| 903 | if (nlk->tx_ring.pg_vec) |
| 904 | netlink_set_ring(sk, &req, true, true); |
| 905 | } |
| 906 | #endif /* CONFIG_NETLINK_MMAP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | |
| 908 | if (!sock_flag(sk, SOCK_DEAD)) { |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 909 | printk(KERN_ERR "Freeing alive netlink socket %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | return; |
| 911 | } |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 912 | |
| 913 | WARN_ON(atomic_read(&sk->sk_rmem_alloc)); |
| 914 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
| 915 | WARN_ON(nlk_sk(sk)->groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | } |
| 917 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 918 | /* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on |
| 919 | * 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] | 920 | * immediately hit write lock and grab all the cpus. Exclusive sleep solves |
| 921 | * this, _but_ remember, it adds useless work on UP machines. |
| 922 | */ |
| 923 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 924 | void netlink_table_grab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 925 | __acquires(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 926 | { |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 927 | might_sleep(); |
| 928 | |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 929 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
| 931 | if (atomic_read(&nl_table_users)) { |
| 932 | DECLARE_WAITQUEUE(wait, current); |
| 933 | |
| 934 | add_wait_queue_exclusive(&nl_table_wait, &wait); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 935 | for (;;) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 937 | if (atomic_read(&nl_table_users) == 0) |
| 938 | break; |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 939 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | schedule(); |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 941 | write_lock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | } |
| 943 | |
| 944 | __set_current_state(TASK_RUNNING); |
| 945 | remove_wait_queue(&nl_table_wait, &wait); |
| 946 | } |
| 947 | } |
| 948 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 949 | void netlink_table_ungrab(void) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 950 | __releases(nl_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | { |
Arjan van de Ven | 6abd219 | 2006-07-03 00:24:07 -0700 | [diff] [blame] | 952 | write_unlock_irq(&nl_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | wake_up(&nl_table_wait); |
| 954 | } |
| 955 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 956 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | netlink_lock_table(void) |
| 958 | { |
| 959 | /* read_lock() synchronizes us to netlink_table_grab */ |
| 960 | |
| 961 | read_lock(&nl_table_lock); |
| 962 | atomic_inc(&nl_table_users); |
| 963 | read_unlock(&nl_table_lock); |
| 964 | } |
| 965 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 966 | static inline void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | netlink_unlock_table(void) |
| 968 | { |
| 969 | if (atomic_dec_and_test(&nl_table_users)) |
| 970 | wake_up(&nl_table_wait); |
| 971 | } |
| 972 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 973 | struct netlink_compare_arg |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 974 | { |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 975 | possible_net_t pnet; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 976 | u32 portid; |
| 977 | }; |
| 978 | |
Herbert Xu | 8f2ddaa | 2015-03-21 14:14:03 +1100 | [diff] [blame] | 979 | /* Doing sizeof directly may yield 4 extra bytes on 64-bit. */ |
| 980 | #define netlink_compare_arg_len \ |
| 981 | (offsetof(struct netlink_compare_arg, portid) + sizeof(u32)) |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 982 | |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 983 | static inline int netlink_compare(struct rhashtable_compare_arg *arg, |
| 984 | const void *ptr) |
| 985 | { |
| 986 | const struct netlink_compare_arg *x = arg->key; |
| 987 | const struct netlink_sock *nlk = ptr; |
| 988 | |
| 989 | return nlk->portid != x->portid || |
| 990 | !net_eq(sock_net(&nlk->sk), read_pnet(&x->pnet)); |
| 991 | } |
| 992 | |
| 993 | static void netlink_compare_arg_init(struct netlink_compare_arg *arg, |
| 994 | struct net *net, u32 portid) |
| 995 | { |
| 996 | memset(arg, 0, sizeof(*arg)); |
| 997 | write_pnet(&arg->pnet, net); |
| 998 | arg->portid = portid; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 999 | } |
| 1000 | |
| 1001 | static struct sock *__netlink_lookup(struct netlink_table *table, u32 portid, |
| 1002 | struct net *net) |
| 1003 | { |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 1004 | struct netlink_compare_arg arg; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1005 | |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 1006 | netlink_compare_arg_init(&arg, net, portid); |
| 1007 | return rhashtable_lookup_fast(&table->hash, &arg, |
| 1008 | netlink_rhashtable_params); |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1009 | } |
| 1010 | |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 1011 | static int __netlink_insert(struct netlink_table *table, struct sock *sk) |
Ying Xue | c5adde9 | 2015-01-12 14:52:23 +0800 | [diff] [blame] | 1012 | { |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 1013 | struct netlink_compare_arg arg; |
Ying Xue | c5adde9 | 2015-01-12 14:52:23 +0800 | [diff] [blame] | 1014 | |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 1015 | netlink_compare_arg_init(&arg, sock_net(sk), nlk_sk(sk)->portid); |
| 1016 | return rhashtable_lookup_insert_key(&table->hash, &arg, |
| 1017 | &nlk_sk(sk)->node, |
| 1018 | netlink_rhashtable_params); |
Ying Xue | c5adde9 | 2015-01-12 14:52:23 +0800 | [diff] [blame] | 1019 | } |
| 1020 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1021 | static struct sock *netlink_lookup(struct net *net, int protocol, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | { |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1023 | struct netlink_table *table = &nl_table[protocol]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1026 | rcu_read_lock(); |
| 1027 | sk = __netlink_lookup(table, portid, net); |
| 1028 | if (sk) |
| 1029 | sock_hold(sk); |
| 1030 | rcu_read_unlock(); |
| 1031 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | return sk; |
| 1033 | } |
| 1034 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 1035 | static const struct proto_ops netlink_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1037 | static void |
| 1038 | netlink_update_listeners(struct sock *sk) |
| 1039 | { |
| 1040 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1041 | unsigned long mask; |
| 1042 | unsigned int i; |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1043 | struct listeners *listeners; |
| 1044 | |
| 1045 | listeners = nl_deref_protected(tbl->listeners); |
| 1046 | if (!listeners) |
| 1047 | return; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1048 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1049 | for (i = 0; i < NLGRPLONGS(tbl->groups); i++) { |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1050 | mask = 0; |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1051 | sk_for_each_bound(sk, &tbl->mc_list) { |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1052 | if (i < NLGRPLONGS(nlk_sk(sk)->ngroups)) |
| 1053 | mask |= nlk_sk(sk)->groups[i]; |
| 1054 | } |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1055 | listeners->masks[i] = mask; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1056 | } |
| 1057 | /* this function is only called with the netlink table "grabbed", which |
| 1058 | * makes sure updates are visible before bind or setsockopt return. */ |
| 1059 | } |
| 1060 | |
Herbert Xu | 8ea65f4 | 2015-01-26 14:02:56 +1100 | [diff] [blame] | 1061 | static int netlink_insert(struct sock *sk, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1062 | { |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1063 | struct netlink_table *table = &nl_table[sk->sk_protocol]; |
Herbert Xu | 919d9db | 2015-01-16 17:23:48 +1100 | [diff] [blame] | 1064 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | |
Ying Xue | c5adde9 | 2015-01-12 14:52:23 +0800 | [diff] [blame] | 1066 | lock_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | |
| 1068 | err = -EBUSY; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1069 | if (nlk_sk(sk)->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | goto err; |
| 1071 | |
| 1072 | err = -ENOMEM; |
Thomas Graf | 97defe1 | 2015-01-02 23:00:20 +0100 | [diff] [blame] | 1073 | if (BITS_PER_LONG > 32 && |
| 1074 | unlikely(atomic_read(&table->hash.nelems) >= UINT_MAX)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | goto err; |
| 1076 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1077 | nlk_sk(sk)->portid = portid; |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1078 | sock_hold(sk); |
Herbert Xu | 919d9db | 2015-01-16 17:23:48 +1100 | [diff] [blame] | 1079 | |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 1080 | err = __netlink_insert(table, sk); |
| 1081 | if (err) { |
| 1082 | if (err == -EEXIST) |
| 1083 | err = -EADDRINUSE; |
Herbert Xu | c0bb07d | 2015-05-16 21:50:28 +0800 | [diff] [blame] | 1084 | nlk_sk(sk)->portid = 0; |
Ying Xue | c5adde9 | 2015-01-12 14:52:23 +0800 | [diff] [blame] | 1085 | sock_put(sk); |
Herbert Xu | 919d9db | 2015-01-16 17:23:48 +1100 | [diff] [blame] | 1086 | } |
| 1087 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | err: |
Ying Xue | c5adde9 | 2015-01-12 14:52:23 +0800 | [diff] [blame] | 1089 | release_sock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | return err; |
| 1091 | } |
| 1092 | |
| 1093 | static void netlink_remove(struct sock *sk) |
| 1094 | { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1095 | struct netlink_table *table; |
| 1096 | |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1097 | table = &nl_table[sk->sk_protocol]; |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 1098 | if (!rhashtable_remove_fast(&table->hash, &nlk_sk(sk)->node, |
| 1099 | netlink_rhashtable_params)) { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1100 | WARN_ON(atomic_read(&sk->sk_refcnt) == 1); |
| 1101 | __sock_put(sk); |
| 1102 | } |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1104 | netlink_table_grab(); |
Johannes Berg | b10dcb3 | 2014-12-22 18:56:37 +0100 | [diff] [blame] | 1105 | if (nlk_sk(sk)->subscriptions) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | __sk_del_bind_node(sk); |
Johannes Berg | b10dcb3 | 2014-12-22 18:56:37 +0100 | [diff] [blame] | 1107 | netlink_update_listeners(sk); |
| 1108 | } |
Johannes Berg | ee1c2442 | 2015-01-16 11:37:14 +0100 | [diff] [blame] | 1109 | if (sk->sk_protocol == NETLINK_GENERIC) |
| 1110 | atomic_inc(&genl_sk_destructing_cnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | netlink_table_ungrab(); |
| 1112 | } |
| 1113 | |
| 1114 | static struct proto netlink_proto = { |
| 1115 | .name = "NETLINK", |
| 1116 | .owner = THIS_MODULE, |
| 1117 | .obj_size = sizeof(struct netlink_sock), |
| 1118 | }; |
| 1119 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 1120 | static int __netlink_create(struct net *net, struct socket *sock, |
| 1121 | struct mutex *cb_mutex, int protocol) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1122 | { |
| 1123 | struct sock *sk; |
| 1124 | struct netlink_sock *nlk; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1125 | |
| 1126 | sock->ops = &netlink_ops; |
| 1127 | |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 1128 | sk = sk_alloc(net, PF_NETLINK, GFP_KERNEL, &netlink_proto); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1129 | if (!sk) |
| 1130 | return -ENOMEM; |
| 1131 | |
| 1132 | sock_init_data(sock, sk); |
| 1133 | |
| 1134 | nlk = nlk_sk(sk); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1135 | if (cb_mutex) { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 1136 | nlk->cb_mutex = cb_mutex; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1137 | } else { |
Patrick McHardy | ffa4d72 | 2007-04-25 14:01:17 -0700 | [diff] [blame] | 1138 | nlk->cb_mutex = &nlk->cb_def_mutex; |
| 1139 | mutex_init(nlk->cb_mutex); |
| 1140 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1141 | init_waitqueue_head(&nlk->wait); |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 1142 | #ifdef CONFIG_NETLINK_MMAP |
| 1143 | mutex_init(&nlk->pg_vec_lock); |
| 1144 | #endif |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1145 | |
| 1146 | sk->sk_destruct = netlink_sock_destruct; |
| 1147 | sk->sk_protocol = protocol; |
| 1148 | return 0; |
| 1149 | } |
| 1150 | |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 1151 | static int netlink_create(struct net *net, struct socket *sock, int protocol, |
| 1152 | int kern) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1153 | { |
| 1154 | struct module *module = NULL; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1155 | struct mutex *cb_mutex; |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1156 | struct netlink_sock *nlk; |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1157 | int (*bind)(struct net *net, int group); |
| 1158 | void (*unbind)(struct net *net, int group); |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1159 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | |
| 1161 | sock->state = SS_UNCONNECTED; |
| 1162 | |
| 1163 | if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM) |
| 1164 | return -ESOCKTNOSUPPORT; |
| 1165 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1166 | if (protocol < 0 || protocol >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | return -EPROTONOSUPPORT; |
| 1168 | |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1169 | netlink_lock_table(); |
Johannes Berg | 95a5afc | 2008-10-16 15:24:51 -0700 | [diff] [blame] | 1170 | #ifdef CONFIG_MODULES |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1171 | if (!nl_table[protocol].registered) { |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1172 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1173 | request_module("net-pf-%d-proto-%d", PF_NETLINK, protocol); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1174 | netlink_lock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1175 | } |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1176 | #endif |
| 1177 | if (nl_table[protocol].registered && |
| 1178 | try_module_get(nl_table[protocol].module)) |
| 1179 | module = nl_table[protocol].module; |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 1180 | else |
| 1181 | err = -EPROTONOSUPPORT; |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 1182 | cb_mutex = nl_table[protocol].cb_mutex; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 1183 | bind = nl_table[protocol].bind; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1184 | unbind = nl_table[protocol].unbind; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1185 | netlink_unlock_table(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1186 | |
Alexey Dobriyan | 974c37e | 2010-01-30 10:05:05 +0000 | [diff] [blame] | 1187 | if (err < 0) |
| 1188 | goto out; |
| 1189 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1190 | err = __netlink_create(net, sock, cb_mutex, protocol); |
| 1191 | if (err < 0) |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1192 | goto out_module; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 1194 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 1195 | sock_prot_inuse_add(net, &netlink_proto, 1); |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 1196 | local_bh_enable(); |
| 1197 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1198 | nlk = nlk_sk(sock->sk); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1199 | nlk->module = module; |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 1200 | nlk->netlink_bind = bind; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1201 | nlk->netlink_unbind = unbind; |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1202 | out: |
| 1203 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | |
Patrick McHardy | ab33a17 | 2005-08-14 19:31:36 -0700 | [diff] [blame] | 1205 | out_module: |
| 1206 | module_put(module); |
| 1207 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | } |
| 1209 | |
Thomas Graf | 21e4902 | 2015-01-02 23:00:22 +0100 | [diff] [blame] | 1210 | static void deferred_put_nlk_sk(struct rcu_head *head) |
| 1211 | { |
| 1212 | struct netlink_sock *nlk = container_of(head, struct netlink_sock, rcu); |
| 1213 | |
| 1214 | sock_put(&nlk->sk); |
| 1215 | } |
| 1216 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | static int netlink_release(struct socket *sock) |
| 1218 | { |
| 1219 | struct sock *sk = sock->sk; |
| 1220 | struct netlink_sock *nlk; |
| 1221 | |
| 1222 | if (!sk) |
| 1223 | return 0; |
| 1224 | |
| 1225 | netlink_remove(sk); |
Denis Lunev | ac57b3a | 2007-04-18 17:05:58 -0700 | [diff] [blame] | 1226 | sock_orphan(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | nlk = nlk_sk(sk); |
| 1228 | |
Herbert Xu | 3f660d6 | 2007-05-03 03:17:14 -0700 | [diff] [blame] | 1229 | /* |
| 1230 | * OK. Socket is unlinked, any packets that arrive now |
| 1231 | * will be purged. |
| 1232 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | |
Johannes Berg | ee1c2442 | 2015-01-16 11:37:14 +0100 | [diff] [blame] | 1234 | /* must not acquire netlink_table_lock in any way again before unbind |
| 1235 | * and notifying genetlink is done as otherwise it might deadlock |
| 1236 | */ |
| 1237 | if (nlk->netlink_unbind) { |
| 1238 | int i; |
| 1239 | |
| 1240 | for (i = 0; i < nlk->ngroups; i++) |
| 1241 | if (test_bit(i, nlk->groups)) |
| 1242 | nlk->netlink_unbind(sock_net(sk), i + 1); |
| 1243 | } |
| 1244 | if (sk->sk_protocol == NETLINK_GENERIC && |
| 1245 | atomic_dec_return(&genl_sk_destructing_cnt) == 0) |
| 1246 | wake_up(&genl_sk_destructing_waitq); |
| 1247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | sock->sk = NULL; |
| 1249 | wake_up_interruptible_all(&nlk->wait); |
| 1250 | |
| 1251 | skb_queue_purge(&sk->sk_write_queue); |
| 1252 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1253 | if (nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | struct netlink_notify n = { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1255 | .net = sock_net(sk), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | .protocol = sk->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1257 | .portid = nlk->portid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1258 | }; |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 1259 | atomic_notifier_call_chain(&netlink_chain, |
| 1260 | NETLINK_URELEASE, &n); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1261 | } |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1262 | |
Mariusz Kozlowski | 5e7c001 | 2007-01-02 15:24:30 -0800 | [diff] [blame] | 1263 | module_put(nlk->module); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 1264 | |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 1265 | if (netlink_is_kernel(sk)) { |
Johannes Berg | b10dcb3 | 2014-12-22 18:56:37 +0100 | [diff] [blame] | 1266 | netlink_table_grab(); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1267 | BUG_ON(nl_table[sk->sk_protocol].registered == 0); |
| 1268 | if (--nl_table[sk->sk_protocol].registered == 0) { |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1269 | struct listeners *old; |
| 1270 | |
| 1271 | old = nl_deref_protected(nl_table[sk->sk_protocol].listeners); |
| 1272 | RCU_INIT_POINTER(nl_table[sk->sk_protocol].listeners, NULL); |
| 1273 | kfree_rcu(old, rcu); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1274 | nl_table[sk->sk_protocol].module = NULL; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1275 | nl_table[sk->sk_protocol].bind = NULL; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1276 | nl_table[sk->sk_protocol].unbind = NULL; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1277 | nl_table[sk->sk_protocol].flags = 0; |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 1278 | nl_table[sk->sk_protocol].registered = 0; |
| 1279 | } |
Johannes Berg | b10dcb3 | 2014-12-22 18:56:37 +0100 | [diff] [blame] | 1280 | netlink_table_ungrab(); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 1281 | } |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 1282 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1283 | kfree(nlk->groups); |
| 1284 | nlk->groups = NULL; |
| 1285 | |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 1286 | local_bh_disable(); |
Eric Dumazet | c1fd3b9 | 2008-11-23 15:48:22 -0800 | [diff] [blame] | 1287 | sock_prot_inuse_add(sock_net(sk), &netlink_proto, -1); |
Eric Dumazet | 3755810 | 2008-11-24 14:05:22 -0800 | [diff] [blame] | 1288 | local_bh_enable(); |
Thomas Graf | 21e4902 | 2015-01-02 23:00:22 +0100 | [diff] [blame] | 1289 | call_rcu(&nlk->rcu, deferred_put_nlk_sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1290 | return 0; |
| 1291 | } |
| 1292 | |
| 1293 | static int netlink_autobind(struct socket *sock) |
| 1294 | { |
| 1295 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1296 | struct net *net = sock_net(sk); |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 1297 | struct netlink_table *table = &nl_table[sk->sk_protocol]; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1298 | s32 portid = task_tgid_vnr(current); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1299 | int err; |
| 1300 | static s32 rover = -4097; |
| 1301 | |
| 1302 | retry: |
| 1303 | cond_resched(); |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1304 | rcu_read_lock(); |
| 1305 | if (__netlink_lookup(table, portid, net)) { |
| 1306 | /* Bind collision, search negative portid values. */ |
| 1307 | portid = rover--; |
| 1308 | if (rover > -4097) |
| 1309 | rover = -4097; |
| 1310 | rcu_read_unlock(); |
| 1311 | goto retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | } |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 1313 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | |
Herbert Xu | 8ea65f4 | 2015-01-26 14:02:56 +1100 | [diff] [blame] | 1315 | err = netlink_insert(sk, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | if (err == -EADDRINUSE) |
| 1317 | goto retry; |
David S. Miller | d470e3b | 2005-06-26 15:31:51 -0700 | [diff] [blame] | 1318 | |
| 1319 | /* If 2 threads race to autobind, that is fine. */ |
| 1320 | if (err == -EBUSY) |
| 1321 | err = 0; |
| 1322 | |
| 1323 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1324 | } |
| 1325 | |
Eric W. Biederman | aa4cf94 | 2014-04-23 14:28:03 -0700 | [diff] [blame] | 1326 | /** |
| 1327 | * __netlink_ns_capable - General netlink message capability test |
| 1328 | * @nsp: NETLINK_CB of the socket buffer holding a netlink command from userspace. |
| 1329 | * @user_ns: The user namespace of the capability to use |
| 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 the user namespace @user_ns. |
| 1335 | */ |
| 1336 | bool __netlink_ns_capable(const struct netlink_skb_parms *nsp, |
| 1337 | struct user_namespace *user_ns, int cap) |
| 1338 | { |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 1339 | return ((nsp->flags & NETLINK_SKB_DST) || |
| 1340 | file_ns_capable(nsp->sk->sk_socket->file, user_ns, cap)) && |
| 1341 | ns_capable(user_ns, cap); |
Eric W. Biederman | aa4cf94 | 2014-04-23 14:28:03 -0700 | [diff] [blame] | 1342 | } |
| 1343 | EXPORT_SYMBOL(__netlink_ns_capable); |
| 1344 | |
| 1345 | /** |
| 1346 | * netlink_ns_capable - General netlink message capability test |
| 1347 | * @skb: socket buffer holding a netlink command from userspace |
| 1348 | * @user_ns: The user namespace of the capability to use |
| 1349 | * @cap: The capability to use |
| 1350 | * |
| 1351 | * Test to see if the opener of the socket we received the message |
| 1352 | * from had when the netlink socket was created and the sender of the |
| 1353 | * message has has the capability @cap in the user namespace @user_ns. |
| 1354 | */ |
| 1355 | bool netlink_ns_capable(const struct sk_buff *skb, |
| 1356 | struct user_namespace *user_ns, int cap) |
| 1357 | { |
| 1358 | return __netlink_ns_capable(&NETLINK_CB(skb), user_ns, cap); |
| 1359 | } |
| 1360 | EXPORT_SYMBOL(netlink_ns_capable); |
| 1361 | |
| 1362 | /** |
| 1363 | * netlink_capable - Netlink global message capability test |
| 1364 | * @skb: socket buffer holding a netlink command from userspace |
| 1365 | * @cap: The capability to use |
| 1366 | * |
| 1367 | * Test to see if the opener of the socket we received the message |
| 1368 | * from had when the netlink socket was created and the sender of the |
| 1369 | * message has has the capability @cap in all user namespaces. |
| 1370 | */ |
| 1371 | bool netlink_capable(const struct sk_buff *skb, int cap) |
| 1372 | { |
| 1373 | return netlink_ns_capable(skb, &init_user_ns, cap); |
| 1374 | } |
| 1375 | EXPORT_SYMBOL(netlink_capable); |
| 1376 | |
| 1377 | /** |
| 1378 | * netlink_net_capable - Netlink network namespace message capability test |
| 1379 | * @skb: socket buffer holding a netlink command from userspace |
| 1380 | * @cap: The capability to use |
| 1381 | * |
| 1382 | * Test to see if the opener of the socket we received the message |
| 1383 | * from had when the netlink socket was created and the sender of the |
| 1384 | * message has has the capability @cap over the network namespace of |
| 1385 | * the socket we received the message from. |
| 1386 | */ |
| 1387 | bool netlink_net_capable(const struct sk_buff *skb, int cap) |
| 1388 | { |
| 1389 | return netlink_ns_capable(skb, sock_net(skb->sk)->user_ns, cap); |
| 1390 | } |
| 1391 | EXPORT_SYMBOL(netlink_net_capable); |
| 1392 | |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 1393 | static inline int netlink_allowed(const struct socket *sock, unsigned int flag) |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1394 | { |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 1395 | return (nl_table[sock->sk->sk_protocol].flags & flag) || |
Eric W. Biederman | df008c9 | 2012-11-16 03:03:07 +0000 | [diff] [blame] | 1396 | ns_capable(sock_net(sock->sk)->user_ns, CAP_NET_ADMIN); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1397 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1398 | |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1399 | static void |
| 1400 | netlink_update_subscriptions(struct sock *sk, unsigned int subscriptions) |
| 1401 | { |
| 1402 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1403 | |
| 1404 | if (nlk->subscriptions && !subscriptions) |
| 1405 | __sk_del_bind_node(sk); |
| 1406 | else if (!nlk->subscriptions && subscriptions) |
| 1407 | sk_add_bind_node(sk, &nl_table[sk->sk_protocol].mc_list); |
| 1408 | nlk->subscriptions = subscriptions; |
| 1409 | } |
| 1410 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1411 | static int netlink_realloc_groups(struct sock *sk) |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1412 | { |
| 1413 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1414 | unsigned int groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1415 | unsigned long *new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1416 | int err = 0; |
| 1417 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1418 | netlink_table_grab(); |
| 1419 | |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1420 | groups = nl_table[sk->sk_protocol].groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1421 | if (!nl_table[sk->sk_protocol].registered) { |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1422 | err = -ENOENT; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1423 | goto out_unlock; |
| 1424 | } |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1425 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1426 | if (nlk->ngroups >= groups) |
| 1427 | goto out_unlock; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1428 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1429 | new_groups = krealloc(nlk->groups, NLGRPSZ(groups), GFP_ATOMIC); |
| 1430 | if (new_groups == NULL) { |
| 1431 | err = -ENOMEM; |
| 1432 | goto out_unlock; |
| 1433 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1434 | memset((char *)new_groups + NLGRPSZ(nlk->ngroups), 0, |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1435 | NLGRPSZ(groups) - NLGRPSZ(nlk->ngroups)); |
| 1436 | |
| 1437 | nlk->groups = new_groups; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1438 | nlk->ngroups = groups; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1439 | out_unlock: |
| 1440 | netlink_table_ungrab(); |
| 1441 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1442 | } |
| 1443 | |
Johannes Berg | 02c81ab | 2014-12-22 18:56:35 +0100 | [diff] [blame] | 1444 | static void netlink_undo_bind(int group, long unsigned int groups, |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1445 | struct sock *sk) |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1446 | { |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1447 | struct netlink_sock *nlk = nlk_sk(sk); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1448 | int undo; |
| 1449 | |
| 1450 | if (!nlk->netlink_unbind) |
| 1451 | return; |
| 1452 | |
| 1453 | for (undo = 0; undo < group; undo++) |
Hiroaki SHIMODA | 6251edd | 2014-11-13 04:24:10 +0900 | [diff] [blame] | 1454 | if (test_bit(undo, &groups)) |
Pablo Neira | 8b7c36d | 2015-01-29 10:51:53 +0100 | [diff] [blame] | 1455 | nlk->netlink_unbind(sock_net(sk), undo + 1); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1456 | } |
| 1457 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1458 | static int netlink_bind(struct socket *sock, struct sockaddr *addr, |
| 1459 | int addr_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1460 | { |
| 1461 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1462 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1464 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
| 1465 | int err; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1466 | long unsigned int groups = nladdr->nl_groups; |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1467 | |
Hannes Frederic Sowa | 4e4b537 | 2012-12-15 15:42:19 +0000 | [diff] [blame] | 1468 | if (addr_len < sizeof(struct sockaddr_nl)) |
| 1469 | return -EINVAL; |
| 1470 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | if (nladdr->nl_family != AF_NETLINK) |
| 1472 | return -EINVAL; |
| 1473 | |
| 1474 | /* Only superuser is allowed to listen multicasts */ |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1475 | if (groups) { |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 1476 | if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV)) |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1477 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1478 | err = netlink_realloc_groups(sk); |
| 1479 | if (err) |
| 1480 | return err; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1481 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1482 | |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1483 | if (nlk->portid) |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1484 | if (nladdr->nl_pid != nlk->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1485 | return -EINVAL; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1486 | |
| 1487 | if (nlk->netlink_bind && groups) { |
| 1488 | int group; |
| 1489 | |
| 1490 | for (group = 0; group < nlk->ngroups; group++) { |
| 1491 | if (!test_bit(group, &groups)) |
| 1492 | continue; |
Pablo Neira | 8b7c36d | 2015-01-29 10:51:53 +0100 | [diff] [blame] | 1493 | err = nlk->netlink_bind(net, group + 1); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1494 | if (!err) |
| 1495 | continue; |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1496 | netlink_undo_bind(group, groups, sk); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1497 | return err; |
| 1498 | } |
| 1499 | } |
| 1500 | |
| 1501 | if (!nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1502 | err = nladdr->nl_pid ? |
Herbert Xu | 8ea65f4 | 2015-01-26 14:02:56 +1100 | [diff] [blame] | 1503 | netlink_insert(sk, nladdr->nl_pid) : |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1504 | netlink_autobind(sock); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1505 | if (err) { |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 1506 | netlink_undo_bind(nlk->ngroups, groups, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | return err; |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1508 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | } |
| 1510 | |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1511 | if (!groups && (nlk->groups == NULL || !(u32)nlk->groups[0])) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | return 0; |
| 1513 | |
| 1514 | netlink_table_grab(); |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1515 | netlink_update_subscriptions(sk, nlk->subscriptions + |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1516 | hweight32(groups) - |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1517 | hweight32(nlk->groups[0])); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 1518 | nlk->groups[0] = (nlk->groups[0] & ~0xffffffffUL) | groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1519 | netlink_update_listeners(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1520 | netlink_table_ungrab(); |
| 1521 | |
| 1522 | return 0; |
| 1523 | } |
| 1524 | |
| 1525 | static int netlink_connect(struct socket *sock, struct sockaddr *addr, |
| 1526 | int alen, int flags) |
| 1527 | { |
| 1528 | int err = 0; |
| 1529 | struct sock *sk = sock->sk; |
| 1530 | struct netlink_sock *nlk = nlk_sk(sk); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1531 | struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | |
Changli Gao | 6503d96 | 2010-03-31 22:58:26 +0000 | [diff] [blame] | 1533 | if (alen < sizeof(addr->sa_family)) |
| 1534 | return -EINVAL; |
| 1535 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | if (addr->sa_family == AF_UNSPEC) { |
| 1537 | sk->sk_state = NETLINK_UNCONNECTED; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1538 | nlk->dst_portid = 0; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1539 | nlk->dst_group = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1540 | return 0; |
| 1541 | } |
| 1542 | if (addr->sa_family != AF_NETLINK) |
| 1543 | return -EINVAL; |
| 1544 | |
Mike Pecovnik | 46833a8 | 2014-02-24 21:11:16 +0100 | [diff] [blame] | 1545 | if ((nladdr->nl_groups || nladdr->nl_pid) && |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 1546 | !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | return -EPERM; |
| 1548 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1549 | if (!nlk->portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1550 | err = netlink_autobind(sock); |
| 1551 | |
| 1552 | if (err == 0) { |
| 1553 | sk->sk_state = NETLINK_CONNECTED; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1554 | nlk->dst_portid = nladdr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1555 | nlk->dst_group = ffs(nladdr->nl_groups); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1556 | } |
| 1557 | |
| 1558 | return err; |
| 1559 | } |
| 1560 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1561 | static int netlink_getname(struct socket *sock, struct sockaddr *addr, |
| 1562 | int *addr_len, int peer) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1563 | { |
| 1564 | struct sock *sk = sock->sk; |
| 1565 | struct netlink_sock *nlk = nlk_sk(sk); |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 1566 | DECLARE_SOCKADDR(struct sockaddr_nl *, nladdr, addr); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 1567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1568 | nladdr->nl_family = AF_NETLINK; |
| 1569 | nladdr->nl_pad = 0; |
| 1570 | *addr_len = sizeof(*nladdr); |
| 1571 | |
| 1572 | if (peer) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1573 | nladdr->nl_pid = nlk->dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 1574 | nladdr->nl_groups = netlink_group_mask(nlk->dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | } else { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1576 | nladdr->nl_pid = nlk->portid; |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 1577 | nladdr->nl_groups = nlk->groups ? nlk->groups[0] : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | } |
| 1579 | return 0; |
| 1580 | } |
| 1581 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1582 | static struct sock *netlink_getsockbyportid(struct sock *ssk, u32 portid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1583 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1584 | struct sock *sock; |
| 1585 | struct netlink_sock *nlk; |
| 1586 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1587 | sock = netlink_lookup(sock_net(ssk), ssk->sk_protocol, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1588 | if (!sock) |
| 1589 | return ERR_PTR(-ECONNREFUSED); |
| 1590 | |
| 1591 | /* Don't bother queuing skb if kernel socket has no input function */ |
| 1592 | nlk = nlk_sk(sock); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1593 | if (sock->sk_state == NETLINK_CONNECTED && |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1594 | nlk->dst_portid != nlk_sk(ssk)->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1595 | sock_put(sock); |
| 1596 | return ERR_PTR(-ECONNREFUSED); |
| 1597 | } |
| 1598 | return sock; |
| 1599 | } |
| 1600 | |
| 1601 | struct sock *netlink_getsockbyfilp(struct file *filp) |
| 1602 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1603 | struct inode *inode = file_inode(filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1604 | struct sock *sock; |
| 1605 | |
| 1606 | if (!S_ISSOCK(inode->i_mode)) |
| 1607 | return ERR_PTR(-ENOTSOCK); |
| 1608 | |
| 1609 | sock = SOCKET_I(inode)->sk; |
| 1610 | if (sock->sk_family != AF_NETLINK) |
| 1611 | return ERR_PTR(-EINVAL); |
| 1612 | |
| 1613 | sock_hold(sock); |
| 1614 | return sock; |
| 1615 | } |
| 1616 | |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1617 | static struct sk_buff *netlink_alloc_large_skb(unsigned int size, |
| 1618 | int broadcast) |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1619 | { |
| 1620 | struct sk_buff *skb; |
| 1621 | void *data; |
| 1622 | |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1623 | if (size <= NLMSG_GOODSIZE || broadcast) |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1624 | return alloc_skb(size, GFP_KERNEL); |
| 1625 | |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1626 | size = SKB_DATA_ALIGN(size) + |
| 1627 | SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1628 | |
| 1629 | data = vmalloc(size); |
| 1630 | if (data == NULL) |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1631 | return NULL; |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1632 | |
Eric Dumazet | 2ea2f62 | 2015-04-24 16:05:01 -0700 | [diff] [blame] | 1633 | skb = __build_skb(data, size); |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1634 | if (skb == NULL) |
| 1635 | vfree(data); |
Eric Dumazet | 2ea2f62 | 2015-04-24 16:05:01 -0700 | [diff] [blame] | 1636 | else |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 1637 | skb->destructor = netlink_skb_destructor; |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1638 | |
| 1639 | return skb; |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1640 | } |
| 1641 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1642 | /* |
| 1643 | * Attach a skb to a netlink socket. |
| 1644 | * The caller must hold a reference to the destination socket. On error, the |
| 1645 | * reference is dropped. The skb is not send to the destination, just all |
| 1646 | * all error checks are performed and memory in the queue is reserved. |
| 1647 | * Return values: |
| 1648 | * < 0: error. skb freed, reference to sock dropped. |
| 1649 | * 0: continue |
| 1650 | * 1: repeat lookup - reference dropped while waiting for socket memory. |
| 1651 | */ |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 1652 | int netlink_attachskb(struct sock *sk, struct sk_buff *skb, |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1653 | long *timeo, struct sock *ssk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | { |
| 1655 | struct netlink_sock *nlk; |
| 1656 | |
| 1657 | nlk = nlk_sk(sk); |
| 1658 | |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 1659 | if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
| 1660 | test_bit(NETLINK_CONGESTED, &nlk->state)) && |
| 1661 | !netlink_skb_is_mmaped(skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1662 | DECLARE_WAITQUEUE(wait, current); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1663 | if (!*timeo) { |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 1664 | if (!ssk || netlink_is_kernel(ssk)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1665 | netlink_overrun(sk); |
| 1666 | sock_put(sk); |
| 1667 | kfree_skb(skb); |
| 1668 | return -EAGAIN; |
| 1669 | } |
| 1670 | |
| 1671 | __set_current_state(TASK_INTERRUPTIBLE); |
| 1672 | add_wait_queue(&nlk->wait, &wait); |
| 1673 | |
| 1674 | if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf || |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1675 | test_bit(NETLINK_CONGESTED, &nlk->state)) && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | !sock_flag(sk, SOCK_DEAD)) |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1677 | *timeo = schedule_timeout(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | |
| 1679 | __set_current_state(TASK_RUNNING); |
| 1680 | remove_wait_queue(&nlk->wait, &wait); |
| 1681 | sock_put(sk); |
| 1682 | |
| 1683 | if (signal_pending(current)) { |
| 1684 | kfree_skb(skb); |
Patrick McHardy | c3d8d1e | 2007-11-07 02:42:09 -0800 | [diff] [blame] | 1685 | return sock_intr_errno(*timeo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1686 | } |
| 1687 | return 1; |
| 1688 | } |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1689 | netlink_skb_set_owner_r(skb, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1690 | return 0; |
| 1691 | } |
| 1692 | |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1693 | static int __netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1694 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1695 | int len = skb->len; |
| 1696 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 1697 | netlink_deliver_tap(skb); |
| 1698 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1699 | #ifdef CONFIG_NETLINK_MMAP |
| 1700 | if (netlink_skb_is_mmaped(skb)) |
| 1701 | netlink_queue_mmaped_skb(sk, skb); |
| 1702 | else if (netlink_rx_is_mmaped(sk)) |
| 1703 | netlink_ring_set_copied(sk, skb); |
| 1704 | else |
| 1705 | #endif /* CONFIG_NETLINK_MMAP */ |
| 1706 | skb_queue_tail(&sk->sk_receive_queue, skb); |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 1707 | sk->sk_data_ready(sk); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1708 | return len; |
| 1709 | } |
| 1710 | |
| 1711 | int netlink_sendskb(struct sock *sk, struct sk_buff *skb) |
| 1712 | { |
| 1713 | int len = __netlink_sendskb(sk, skb); |
| 1714 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1715 | sock_put(sk); |
| 1716 | return len; |
| 1717 | } |
| 1718 | |
| 1719 | void netlink_detachskb(struct sock *sk, struct sk_buff *skb) |
| 1720 | { |
| 1721 | kfree_skb(skb); |
| 1722 | sock_put(sk); |
| 1723 | } |
| 1724 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1725 | 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] | 1726 | { |
| 1727 | int delta; |
| 1728 | |
Patrick McHardy | 1298ca4 | 2013-04-17 06:46:59 +0000 | [diff] [blame] | 1729 | WARN_ON(skb->sk != NULL); |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 1730 | if (netlink_skb_is_mmaped(skb)) |
| 1731 | return skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | |
Arnaldo Carvalho de Melo | 4305b54 | 2007-04-19 20:43:29 -0700 | [diff] [blame] | 1733 | delta = skb->end - skb->tail; |
Pablo Neira Ayuso | c05cdb1 | 2013-06-03 09:46:28 +0000 | [diff] [blame] | 1734 | if (is_vmalloc_addr(skb->head) || delta * 2 < skb->truesize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1735 | return skb; |
| 1736 | |
| 1737 | if (skb_shared(skb)) { |
| 1738 | struct sk_buff *nskb = skb_clone(skb, allocation); |
| 1739 | if (!nskb) |
| 1740 | return skb; |
Eric Dumazet | 8460c00 | 2012-04-19 02:24:28 +0000 | [diff] [blame] | 1741 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1742 | skb = nskb; |
| 1743 | } |
| 1744 | |
| 1745 | if (!pskb_expand_head(skb, 0, -delta, allocation)) |
| 1746 | skb->truesize -= delta; |
| 1747 | |
| 1748 | return skb; |
| 1749 | } |
| 1750 | |
Eric W. Biederman | 3fbc290 | 2012-05-24 17:21:27 -0600 | [diff] [blame] | 1751 | static int netlink_unicast_kernel(struct sock *sk, struct sk_buff *skb, |
| 1752 | struct sock *ssk) |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1753 | { |
| 1754 | int ret; |
| 1755 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1756 | |
| 1757 | ret = -ECONNREFUSED; |
| 1758 | if (nlk->netlink_rcv != NULL) { |
| 1759 | ret = skb->len; |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1760 | netlink_skb_set_owner_r(skb, sk); |
Patrick McHardy | e32123e | 2013-04-17 06:46:57 +0000 | [diff] [blame] | 1761 | NETLINK_CB(skb).sk = ssk; |
Daniel Borkmann | 73bfd37 | 2013-12-23 14:35:55 +0100 | [diff] [blame] | 1762 | netlink_deliver_tap_kernel(sk, ssk, skb); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1763 | nlk->netlink_rcv(skb); |
Eric Dumazet | bfb253c | 2012-04-22 21:30:29 +0000 | [diff] [blame] | 1764 | consume_skb(skb); |
| 1765 | } else { |
| 1766 | kfree_skb(skb); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1767 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1768 | sock_put(sk); |
| 1769 | return ret; |
| 1770 | } |
| 1771 | |
| 1772 | int netlink_unicast(struct sock *ssk, struct sk_buff *skb, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1773 | u32 portid, int nonblock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1774 | { |
| 1775 | struct sock *sk; |
| 1776 | int err; |
| 1777 | long timeo; |
| 1778 | |
| 1779 | skb = netlink_trim(skb, gfp_any()); |
| 1780 | |
| 1781 | timeo = sock_sndtimeo(ssk, nonblock); |
| 1782 | retry: |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1783 | sk = netlink_getsockbyportid(ssk, portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | if (IS_ERR(sk)) { |
| 1785 | kfree_skb(skb); |
| 1786 | return PTR_ERR(sk); |
| 1787 | } |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1788 | if (netlink_is_kernel(sk)) |
Eric W. Biederman | 3fbc290 | 2012-05-24 17:21:27 -0600 | [diff] [blame] | 1789 | return netlink_unicast_kernel(sk, skb, ssk); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 1790 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1791 | if (sk_filter(sk, skb)) { |
Wang Chen | 8487460 | 2008-07-01 19:55:09 -0700 | [diff] [blame] | 1792 | err = skb->len; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1793 | kfree_skb(skb); |
| 1794 | sock_put(sk); |
| 1795 | return err; |
| 1796 | } |
| 1797 | |
Denis V. Lunev | 9457afe | 2008-06-05 11:23:39 -0700 | [diff] [blame] | 1798 | err = netlink_attachskb(sk, skb, &timeo, ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1799 | if (err == 1) |
| 1800 | goto retry; |
| 1801 | if (err) |
| 1802 | return err; |
| 1803 | |
Denis V. Lunev | 7ee015e | 2007-10-10 21:14:03 -0700 | [diff] [blame] | 1804 | return netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1805 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 1806 | EXPORT_SYMBOL(netlink_unicast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1807 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1808 | struct sk_buff *netlink_alloc_skb(struct sock *ssk, unsigned int size, |
| 1809 | u32 dst_portid, gfp_t gfp_mask) |
| 1810 | { |
| 1811 | #ifdef CONFIG_NETLINK_MMAP |
| 1812 | struct sock *sk = NULL; |
| 1813 | struct sk_buff *skb; |
| 1814 | struct netlink_ring *ring; |
| 1815 | struct nl_mmap_hdr *hdr; |
| 1816 | unsigned int maxlen; |
| 1817 | |
| 1818 | sk = netlink_getsockbyportid(ssk, dst_portid); |
| 1819 | if (IS_ERR(sk)) |
| 1820 | goto out; |
| 1821 | |
| 1822 | ring = &nlk_sk(sk)->rx_ring; |
| 1823 | /* fast-path without atomic ops for common case: non-mmaped receiver */ |
| 1824 | if (ring->pg_vec == NULL) |
| 1825 | goto out_put; |
| 1826 | |
Thomas Graf | aae9f0e | 2013-11-30 13:21:31 +0100 | [diff] [blame] | 1827 | if (ring->frame_size - NL_MMAP_HDRLEN < size) |
| 1828 | goto out_put; |
| 1829 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1830 | skb = alloc_skb_head(gfp_mask); |
| 1831 | if (skb == NULL) |
| 1832 | goto err1; |
| 1833 | |
| 1834 | spin_lock_bh(&sk->sk_receive_queue.lock); |
| 1835 | /* check again under lock */ |
| 1836 | if (ring->pg_vec == NULL) |
| 1837 | goto out_free; |
| 1838 | |
Thomas Graf | aae9f0e | 2013-11-30 13:21:31 +0100 | [diff] [blame] | 1839 | /* check again under lock */ |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1840 | maxlen = ring->frame_size - NL_MMAP_HDRLEN; |
| 1841 | if (maxlen < size) |
| 1842 | goto out_free; |
| 1843 | |
| 1844 | netlink_forward_ring(ring); |
| 1845 | hdr = netlink_current_frame(ring, NL_MMAP_STATUS_UNUSED); |
| 1846 | if (hdr == NULL) |
| 1847 | goto err2; |
| 1848 | netlink_ring_setup_skb(skb, sk, ring, hdr); |
| 1849 | netlink_set_status(hdr, NL_MMAP_STATUS_RESERVED); |
| 1850 | atomic_inc(&ring->pending); |
| 1851 | netlink_increment_head(ring); |
| 1852 | |
| 1853 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1854 | return skb; |
| 1855 | |
| 1856 | err2: |
| 1857 | kfree_skb(skb); |
| 1858 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
Patrick McHardy | cd1df52 | 2013-04-17 06:47:05 +0000 | [diff] [blame] | 1859 | netlink_overrun(sk); |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 1860 | err1: |
| 1861 | sock_put(sk); |
| 1862 | return NULL; |
| 1863 | |
| 1864 | out_free: |
| 1865 | kfree_skb(skb); |
| 1866 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
| 1867 | out_put: |
| 1868 | sock_put(sk); |
| 1869 | out: |
| 1870 | #endif |
| 1871 | return alloc_skb(size, gfp_mask); |
| 1872 | } |
| 1873 | EXPORT_SYMBOL_GPL(netlink_alloc_skb); |
| 1874 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1875 | int netlink_has_listeners(struct sock *sk, unsigned int group) |
| 1876 | { |
| 1877 | int res = 0; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1878 | struct listeners *listeners; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1879 | |
Denis V. Lunev | aed8156 | 2007-10-10 21:14:32 -0700 | [diff] [blame] | 1880 | BUG_ON(!netlink_is_kernel(sk)); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1881 | |
| 1882 | rcu_read_lock(); |
| 1883 | listeners = rcu_dereference(nl_table[sk->sk_protocol].listeners); |
| 1884 | |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 1885 | if (listeners && group - 1 < nl_table[sk->sk_protocol].groups) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 1886 | res = test_bit(group - 1, listeners->masks); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 1887 | |
| 1888 | rcu_read_unlock(); |
| 1889 | |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 1890 | return res; |
| 1891 | } |
| 1892 | EXPORT_SYMBOL_GPL(netlink_has_listeners); |
| 1893 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 1894 | static int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1895 | { |
| 1896 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1897 | |
| 1898 | if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf && |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 1899 | !test_bit(NETLINK_CONGESTED, &nlk->state)) { |
Patrick McHardy | cf0a018 | 2013-04-17 06:47:00 +0000 | [diff] [blame] | 1900 | netlink_skb_set_owner_r(skb, sk); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 1901 | __netlink_sendskb(sk, skb); |
stephen hemminger | 2c645800 | 2011-12-22 08:52:03 +0000 | [diff] [blame] | 1902 | return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1903 | } |
| 1904 | return -1; |
| 1905 | } |
| 1906 | |
| 1907 | struct netlink_broadcast_data { |
| 1908 | struct sock *exclude_sk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1909 | struct net *net; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1910 | u32 portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | u32 group; |
| 1912 | int failure; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1913 | int delivery_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | int congested; |
| 1915 | int delivered; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 1916 | gfp_t allocation; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1917 | struct sk_buff *skb, *skb2; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1918 | int (*tx_filter)(struct sock *dsk, struct sk_buff *skb, void *data); |
| 1919 | void *tx_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1920 | }; |
| 1921 | |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1922 | static void do_one_broadcast(struct sock *sk, |
| 1923 | struct netlink_broadcast_data *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1924 | { |
| 1925 | struct netlink_sock *nlk = nlk_sk(sk); |
| 1926 | int val; |
| 1927 | |
| 1928 | if (p->exclude_sk == sk) |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1929 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1931 | if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups || |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 1932 | !test_bit(p->group - 1, nlk->groups)) |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1933 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1935 | if (!net_eq(sock_net(sk), p->net)) |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1936 | return; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1937 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1938 | if (p->failure) { |
| 1939 | netlink_overrun(sk); |
Rami Rosen | 46c9521 | 2014-07-01 21:17:35 +0300 | [diff] [blame] | 1940 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | } |
| 1942 | |
| 1943 | sock_hold(sk); |
| 1944 | if (p->skb2 == NULL) { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1945 | if (skb_shared(p->skb)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | p->skb2 = skb_clone(p->skb, p->allocation); |
| 1947 | } else { |
Tommy S. Christensen | 68acc02 | 2005-05-19 13:06:35 -0700 | [diff] [blame] | 1948 | p->skb2 = skb_get(p->skb); |
| 1949 | /* |
| 1950 | * skb ownership may have been set when |
| 1951 | * delivered to a previous socket. |
| 1952 | */ |
| 1953 | skb_orphan(p->skb2); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | } |
| 1955 | } |
| 1956 | if (p->skb2 == NULL) { |
| 1957 | netlink_overrun(sk); |
| 1958 | /* Clone failed. Notify ALL listeners. */ |
| 1959 | p->failure = 1; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1960 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1961 | p->delivery_failure = 1; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 1962 | } else if (p->tx_filter && p->tx_filter(sk, p->skb2, p->tx_data)) { |
| 1963 | kfree_skb(p->skb2); |
| 1964 | p->skb2 = NULL; |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 1965 | } else if (sk_filter(sk, p->skb2)) { |
| 1966 | kfree_skb(p->skb2); |
| 1967 | p->skb2 = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | } else if ((val = netlink_broadcast_deliver(sk, p->skb2)) < 0) { |
| 1969 | netlink_overrun(sk); |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 1970 | if (nlk->flags & NETLINK_BROADCAST_SEND_ERROR) |
| 1971 | p->delivery_failure = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1972 | } else { |
| 1973 | p->congested |= val; |
| 1974 | p->delivered = 1; |
| 1975 | p->skb2 = NULL; |
| 1976 | } |
| 1977 | sock_put(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1978 | } |
| 1979 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1980 | 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] | 1981 | u32 group, gfp_t allocation, |
| 1982 | int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data), |
| 1983 | void *filter_data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1984 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1985 | struct net *net = sock_net(ssk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1986 | struct netlink_broadcast_data info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1987 | struct sock *sk; |
| 1988 | |
| 1989 | skb = netlink_trim(skb, allocation); |
| 1990 | |
| 1991 | info.exclude_sk = ssk; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 1992 | info.net = net; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 1993 | info.portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1994 | info.group = group; |
| 1995 | info.failure = 0; |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 1996 | info.delivery_failure = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | info.congested = 0; |
| 1998 | info.delivered = 0; |
| 1999 | info.allocation = allocation; |
| 2000 | info.skb = skb; |
| 2001 | info.skb2 = NULL; |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 2002 | info.tx_filter = filter; |
| 2003 | info.tx_data = filter_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2004 | |
| 2005 | /* While we sleep in clone, do not allow to change socket list */ |
| 2006 | |
| 2007 | netlink_lock_table(); |
| 2008 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2009 | sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2010 | do_one_broadcast(sk, &info); |
| 2011 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 2012 | consume_skb(skb); |
Tommy S. Christensen | aa1c6a6 | 2005-05-19 13:07:32 -0700 | [diff] [blame] | 2013 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2014 | netlink_unlock_table(); |
| 2015 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 2016 | if (info.delivery_failure) { |
| 2017 | kfree_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 2018 | return -ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2019 | } |
| 2020 | consume_skb(info.skb2); |
Pablo Neira Ayuso | ff491a7 | 2009-02-05 23:56:36 -0800 | [diff] [blame] | 2021 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2022 | if (info.delivered) { |
| 2023 | if (info.congested && (allocation & __GFP_WAIT)) |
| 2024 | yield(); |
| 2025 | return 0; |
| 2026 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | return -ESRCH; |
| 2028 | } |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 2029 | EXPORT_SYMBOL(netlink_broadcast_filtered); |
| 2030 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2031 | 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] | 2032 | u32 group, gfp_t allocation) |
| 2033 | { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2034 | return netlink_broadcast_filtered(ssk, skb, portid, group, allocation, |
Eric W. Biederman | 910a7e9 | 2010-05-04 17:36:46 -0700 | [diff] [blame] | 2035 | NULL, NULL); |
| 2036 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2037 | EXPORT_SYMBOL(netlink_broadcast); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | |
| 2039 | struct netlink_set_err_data { |
| 2040 | struct sock *exclude_sk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2041 | u32 portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2042 | u32 group; |
| 2043 | int code; |
| 2044 | }; |
| 2045 | |
stephen hemminger | b57ef81f | 2011-12-22 08:52:02 +0000 | [diff] [blame] | 2046 | 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] | 2047 | { |
| 2048 | struct netlink_sock *nlk = nlk_sk(sk); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2049 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | |
| 2051 | if (sk == p->exclude_sk) |
| 2052 | goto out; |
| 2053 | |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 2054 | if (!net_eq(sock_net(sk), sock_net(p->exclude_sk))) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2055 | goto out; |
| 2056 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2057 | if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups || |
Patrick McHardy | f7fa9b1 | 2005-08-15 12:29:13 -0700 | [diff] [blame] | 2058 | !test_bit(p->group - 1, nlk->groups)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2059 | goto out; |
| 2060 | |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2061 | if (p->code == ENOBUFS && nlk->flags & NETLINK_RECV_NO_ENOBUFS) { |
| 2062 | ret = 1; |
| 2063 | goto out; |
| 2064 | } |
| 2065 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2066 | sk->sk_err = p->code; |
| 2067 | sk->sk_error_report(sk); |
| 2068 | out: |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2069 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2070 | } |
| 2071 | |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2072 | /** |
| 2073 | * netlink_set_err - report error to broadcast listeners |
| 2074 | * @ssk: the kernel netlink socket, as returned by netlink_kernel_create() |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2075 | * @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] | 2076 | * @group: the broadcast group that will notice the error |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2077 | * @code: error code, must be negative (as usual in kernelspace) |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2078 | * |
| 2079 | * This function returns the number of broadcast listeners that have set the |
| 2080 | * NETLINK_RECV_NO_ENOBUFS socket option. |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2081 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2082 | 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] | 2083 | { |
| 2084 | struct netlink_set_err_data info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2085 | struct sock *sk; |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2086 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2087 | |
| 2088 | info.exclude_sk = ssk; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2089 | info.portid = portid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2090 | info.group = group; |
Pablo Neira Ayuso | 4843b93 | 2009-03-03 23:37:30 -0800 | [diff] [blame] | 2091 | /* sk->sk_err wants a positive error value */ |
| 2092 | info.code = -code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2093 | |
| 2094 | read_lock(&nl_table_lock); |
| 2095 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2096 | 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] | 2097 | ret += do_one_set_err(sk, &info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2098 | |
| 2099 | read_unlock(&nl_table_lock); |
Pablo Neira Ayuso | 1a50307 | 2010-03-18 14:24:42 +0000 | [diff] [blame] | 2100 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | } |
Pablo Neira Ayuso | dd5b6ce | 2009-03-23 13:21:06 +0100 | [diff] [blame] | 2102 | EXPORT_SYMBOL(netlink_set_err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2103 | |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 2104 | /* must be called with netlink table grabbed */ |
| 2105 | static void netlink_update_socket_mc(struct netlink_sock *nlk, |
| 2106 | unsigned int group, |
| 2107 | int is_new) |
| 2108 | { |
| 2109 | int old, new = !!is_new, subscriptions; |
| 2110 | |
| 2111 | old = test_bit(group - 1, nlk->groups); |
| 2112 | subscriptions = nlk->subscriptions - old + new; |
| 2113 | if (new) |
| 2114 | __set_bit(group - 1, nlk->groups); |
| 2115 | else |
| 2116 | __clear_bit(group - 1, nlk->groups); |
| 2117 | netlink_update_subscriptions(&nlk->sk, subscriptions); |
| 2118 | netlink_update_listeners(&nlk->sk); |
| 2119 | } |
| 2120 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2121 | static int netlink_setsockopt(struct socket *sock, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 2122 | char __user *optval, unsigned int optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2123 | { |
| 2124 | struct sock *sk = sock->sk; |
| 2125 | struct netlink_sock *nlk = nlk_sk(sk); |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 2126 | unsigned int val = 0; |
| 2127 | int err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2128 | |
| 2129 | if (level != SOL_NETLINK) |
| 2130 | return -ENOPROTOOPT; |
| 2131 | |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 2132 | if (optname != NETLINK_RX_RING && optname != NETLINK_TX_RING && |
| 2133 | optlen >= sizeof(int) && |
Johannes Berg | eb49653 | 2007-07-18 02:07:51 -0700 | [diff] [blame] | 2134 | get_user(val, (unsigned int __user *)optval)) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2135 | return -EFAULT; |
| 2136 | |
| 2137 | switch (optname) { |
| 2138 | case NETLINK_PKTINFO: |
| 2139 | if (val) |
| 2140 | nlk->flags |= NETLINK_RECV_PKTINFO; |
| 2141 | else |
| 2142 | nlk->flags &= ~NETLINK_RECV_PKTINFO; |
| 2143 | err = 0; |
| 2144 | break; |
| 2145 | case NETLINK_ADD_MEMBERSHIP: |
| 2146 | case NETLINK_DROP_MEMBERSHIP: { |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 2147 | if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV)) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2148 | return -EPERM; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2149 | err = netlink_realloc_groups(sk); |
| 2150 | if (err) |
| 2151 | return err; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2152 | if (!val || val - 1 >= nlk->ngroups) |
| 2153 | return -EINVAL; |
Richard Guy Briggs | 7774d5e | 2014-04-22 21:31:55 -0400 | [diff] [blame] | 2154 | if (optname == NETLINK_ADD_MEMBERSHIP && nlk->netlink_bind) { |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 2155 | err = nlk->netlink_bind(sock_net(sk), val); |
Richard Guy Briggs | 4f52090 | 2014-04-22 21:31:54 -0400 | [diff] [blame] | 2156 | if (err) |
| 2157 | return err; |
| 2158 | } |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2159 | netlink_table_grab(); |
Johannes Berg | 84659eb | 2007-07-18 15:47:05 -0700 | [diff] [blame] | 2160 | netlink_update_socket_mc(nlk, val, |
| 2161 | optname == NETLINK_ADD_MEMBERSHIP); |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2162 | netlink_table_ungrab(); |
Richard Guy Briggs | 7774d5e | 2014-04-22 21:31:55 -0400 | [diff] [blame] | 2163 | if (optname == NETLINK_DROP_MEMBERSHIP && nlk->netlink_unbind) |
Johannes Berg | 023e2cf | 2014-12-23 21:00:06 +0100 | [diff] [blame] | 2164 | nlk->netlink_unbind(sock_net(sk), val); |
Pablo Neira Ayuso | 0329274 | 2012-06-29 06:15:22 +0000 | [diff] [blame] | 2165 | |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2166 | err = 0; |
| 2167 | break; |
| 2168 | } |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 2169 | case NETLINK_BROADCAST_ERROR: |
| 2170 | if (val) |
| 2171 | nlk->flags |= NETLINK_BROADCAST_SEND_ERROR; |
| 2172 | else |
| 2173 | nlk->flags &= ~NETLINK_BROADCAST_SEND_ERROR; |
| 2174 | err = 0; |
| 2175 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2176 | case NETLINK_NO_ENOBUFS: |
| 2177 | if (val) { |
| 2178 | nlk->flags |= NETLINK_RECV_NO_ENOBUFS; |
Patrick McHardy | cd967e0 | 2013-04-17 06:46:56 +0000 | [diff] [blame] | 2179 | clear_bit(NETLINK_CONGESTED, &nlk->state); |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2180 | wake_up_interruptible(&nlk->wait); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2181 | } else { |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2182 | nlk->flags &= ~NETLINK_RECV_NO_ENOBUFS; |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 2183 | } |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2184 | err = 0; |
| 2185 | break; |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 2186 | #ifdef CONFIG_NETLINK_MMAP |
| 2187 | case NETLINK_RX_RING: |
| 2188 | case NETLINK_TX_RING: { |
| 2189 | struct nl_mmap_req req; |
| 2190 | |
| 2191 | /* Rings might consume more memory than queue limits, require |
| 2192 | * CAP_NET_ADMIN. |
| 2193 | */ |
| 2194 | if (!capable(CAP_NET_ADMIN)) |
| 2195 | return -EPERM; |
| 2196 | if (optlen < sizeof(req)) |
| 2197 | return -EINVAL; |
| 2198 | if (copy_from_user(&req, optval, sizeof(req))) |
| 2199 | return -EFAULT; |
| 2200 | err = netlink_set_ring(sk, &req, false, |
| 2201 | optname == NETLINK_TX_RING); |
| 2202 | break; |
| 2203 | } |
| 2204 | #endif /* CONFIG_NETLINK_MMAP */ |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2205 | default: |
| 2206 | err = -ENOPROTOOPT; |
| 2207 | } |
| 2208 | return err; |
| 2209 | } |
| 2210 | |
| 2211 | static int netlink_getsockopt(struct socket *sock, int level, int optname, |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2212 | char __user *optval, int __user *optlen) |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2213 | { |
| 2214 | struct sock *sk = sock->sk; |
| 2215 | struct netlink_sock *nlk = nlk_sk(sk); |
| 2216 | int len, val, err; |
| 2217 | |
| 2218 | if (level != SOL_NETLINK) |
| 2219 | return -ENOPROTOOPT; |
| 2220 | |
| 2221 | if (get_user(len, optlen)) |
| 2222 | return -EFAULT; |
| 2223 | if (len < 0) |
| 2224 | return -EINVAL; |
| 2225 | |
| 2226 | switch (optname) { |
| 2227 | case NETLINK_PKTINFO: |
| 2228 | if (len < sizeof(int)) |
| 2229 | return -EINVAL; |
| 2230 | len = sizeof(int); |
| 2231 | val = nlk->flags & NETLINK_RECV_PKTINFO ? 1 : 0; |
Heiko Carstens | a27b58f | 2006-10-30 15:06:12 -0800 | [diff] [blame] | 2232 | if (put_user(len, optlen) || |
| 2233 | put_user(val, optval)) |
| 2234 | return -EFAULT; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2235 | err = 0; |
| 2236 | break; |
Pablo Neira Ayuso | be0c22a | 2009-02-18 01:40:43 +0000 | [diff] [blame] | 2237 | case NETLINK_BROADCAST_ERROR: |
| 2238 | if (len < sizeof(int)) |
| 2239 | return -EINVAL; |
| 2240 | len = sizeof(int); |
| 2241 | val = nlk->flags & NETLINK_BROADCAST_SEND_ERROR ? 1 : 0; |
| 2242 | if (put_user(len, optlen) || |
| 2243 | put_user(val, optval)) |
| 2244 | return -EFAULT; |
| 2245 | err = 0; |
| 2246 | break; |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 2247 | case NETLINK_NO_ENOBUFS: |
| 2248 | if (len < sizeof(int)) |
| 2249 | return -EINVAL; |
| 2250 | len = sizeof(int); |
| 2251 | val = nlk->flags & NETLINK_RECV_NO_ENOBUFS ? 1 : 0; |
| 2252 | if (put_user(len, optlen) || |
| 2253 | put_user(val, optval)) |
| 2254 | return -EFAULT; |
| 2255 | err = 0; |
| 2256 | break; |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 2257 | default: |
| 2258 | err = -ENOPROTOOPT; |
| 2259 | } |
| 2260 | return err; |
| 2261 | } |
| 2262 | |
| 2263 | static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb) |
| 2264 | { |
| 2265 | struct nl_pktinfo info; |
| 2266 | |
| 2267 | info.group = NETLINK_CB(skb).dst_group; |
| 2268 | put_cmsg(msg, SOL_NETLINK, NETLINK_PKTINFO, sizeof(info), &info); |
| 2269 | } |
| 2270 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2271 | static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2273 | struct sock *sk = sock->sk; |
| 2274 | struct netlink_sock *nlk = nlk_sk(sk); |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 2275 | DECLARE_SOCKADDR(struct sockaddr_nl *, addr, msg->msg_name); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2276 | u32 dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2277 | u32 dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | struct sk_buff *skb; |
| 2279 | int err; |
| 2280 | struct scm_cookie scm; |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 2281 | u32 netlink_skb_flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2282 | |
| 2283 | if (msg->msg_flags&MSG_OOB) |
| 2284 | return -EOPNOTSUPP; |
| 2285 | |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2286 | err = scm_send(sock, msg, &scm, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | if (err < 0) |
| 2288 | return err; |
| 2289 | |
| 2290 | if (msg->msg_namelen) { |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2291 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | if (addr->nl_family != AF_NETLINK) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2293 | goto out; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2294 | dst_portid = addr->nl_pid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2295 | dst_group = ffs(addr->nl_groups); |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2296 | err = -EPERM; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2297 | if ((dst_group || dst_portid) && |
Eric W. Biederman | 5187cd0 | 2014-04-23 14:25:48 -0700 | [diff] [blame] | 2298 | !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND)) |
Eric W. Biederman | b47030c | 2010-06-13 03:31:06 +0000 | [diff] [blame] | 2299 | goto out; |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 2300 | netlink_skb_flags |= NETLINK_SKB_DST; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | } else { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2302 | dst_portid = nlk->dst_portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2303 | dst_group = nlk->dst_group; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | } |
| 2305 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2306 | if (!nlk->portid) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2307 | err = netlink_autobind(sock); |
| 2308 | if (err) |
| 2309 | goto out; |
| 2310 | } |
| 2311 | |
Al Viro | a8866ff | 2014-12-12 23:02:36 -0500 | [diff] [blame] | 2312 | /* It's a really convoluted way for userland to ask for mmaped |
| 2313 | * sendmsg(), but that's what we've got... |
| 2314 | */ |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 2315 | if (netlink_tx_is_mmaped(sk) && |
Al Viro | a8866ff | 2014-12-12 23:02:36 -0500 | [diff] [blame] | 2316 | msg->msg_iter.type == ITER_IOVEC && |
| 2317 | msg->msg_iter.nr_segs == 1 && |
Al Viro | c0371da | 2014-11-24 10:42:55 -0500 | [diff] [blame] | 2318 | msg->msg_iter.iov->iov_base == NULL) { |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 2319 | err = netlink_mmap_sendmsg(sk, msg, dst_portid, dst_group, |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2320 | &scm); |
Patrick McHardy | 5fd9612 | 2013-04-17 06:47:03 +0000 | [diff] [blame] | 2321 | goto out; |
| 2322 | } |
| 2323 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2324 | err = -EMSGSIZE; |
| 2325 | if (len > sk->sk_sndbuf - 32) |
| 2326 | goto out; |
| 2327 | err = -ENOBUFS; |
Pablo Neira | 3a36515 | 2013-06-28 03:04:23 +0200 | [diff] [blame] | 2328 | skb = netlink_alloc_large_skb(len, dst_group); |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2329 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2330 | goto out; |
| 2331 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2332 | NETLINK_CB(skb).portid = nlk->portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2333 | NETLINK_CB(skb).dst_group = dst_group; |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2334 | NETLINK_CB(skb).creds = scm.creds; |
Eric W. Biederman | 2d7a85f | 2014-05-30 11:04:00 -0700 | [diff] [blame] | 2335 | NETLINK_CB(skb).flags = netlink_skb_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2337 | err = -EFAULT; |
Al Viro | 6ce8e9c | 2014-04-06 21:25:44 -0400 | [diff] [blame] | 2338 | if (memcpy_from_msg(skb_put(skb, len), msg, len)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2339 | kfree_skb(skb); |
| 2340 | goto out; |
| 2341 | } |
| 2342 | |
| 2343 | err = security_netlink_send(sk, skb); |
| 2344 | if (err) { |
| 2345 | kfree_skb(skb); |
| 2346 | goto out; |
| 2347 | } |
| 2348 | |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2349 | if (dst_group) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2350 | atomic_inc(&skb->users); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2351 | netlink_broadcast(sk, skb, dst_portid, dst_group, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2352 | } |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2353 | err = netlink_unicast(sk, skb, dst_portid, msg->msg_flags&MSG_DONTWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2354 | |
| 2355 | out: |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2356 | scm_destroy(&scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2357 | return err; |
| 2358 | } |
| 2359 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2360 | static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, size_t len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | int flags) |
| 2362 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2363 | struct scm_cookie scm; |
| 2364 | struct sock *sk = sock->sk; |
| 2365 | struct netlink_sock *nlk = nlk_sk(sk); |
| 2366 | int noblock = flags&MSG_DONTWAIT; |
| 2367 | size_t copied; |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2368 | struct sk_buff *skb, *data_skb; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2369 | int err, ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2370 | |
| 2371 | if (flags&MSG_OOB) |
| 2372 | return -EOPNOTSUPP; |
| 2373 | |
| 2374 | copied = 0; |
| 2375 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2376 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
| 2377 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2378 | goto out; |
| 2379 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2380 | data_skb = skb; |
| 2381 | |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2382 | #ifdef CONFIG_COMPAT_NETLINK_MESSAGES |
| 2383 | if (unlikely(skb_shinfo(skb)->frag_list)) { |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2384 | /* |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2385 | * If this skb has a frag_list, then here that means that we |
| 2386 | * will have to use the frag_list skb's data for compat tasks |
| 2387 | * and the regular skb's data for normal (non-compat) tasks. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2388 | * |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2389 | * If we need to send the compat skb, assign it to the |
| 2390 | * 'data_skb' variable so that it will be used below for data |
| 2391 | * copying. We keep 'skb' for everything else, including |
| 2392 | * freeing both later. |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2393 | */ |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2394 | if (flags & MSG_CMSG_COMPAT) |
| 2395 | data_skb = skb_shinfo(skb)->frag_list; |
Johannes Berg | 1dacc76 | 2009-07-01 11:26:02 +0000 | [diff] [blame] | 2396 | } |
| 2397 | #endif |
| 2398 | |
Eric Dumazet | 9063e21 | 2014-03-07 12:02:33 -0800 | [diff] [blame] | 2399 | /* Record the max length of recvmsg() calls for future allocations */ |
| 2400 | nlk->max_recvmsg_len = max(nlk->max_recvmsg_len, len); |
| 2401 | nlk->max_recvmsg_len = min_t(size_t, nlk->max_recvmsg_len, |
| 2402 | 16384); |
| 2403 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2404 | copied = data_skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2405 | if (len < copied) { |
| 2406 | msg->msg_flags |= MSG_TRUNC; |
| 2407 | copied = len; |
| 2408 | } |
| 2409 | |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2410 | skb_reset_transport_header(data_skb); |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 2411 | err = skb_copy_datagram_msg(data_skb, 0, msg, copied); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2412 | |
| 2413 | if (msg->msg_name) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 2414 | DECLARE_SOCKADDR(struct sockaddr_nl *, addr, msg->msg_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2415 | addr->nl_family = AF_NETLINK; |
| 2416 | addr->nl_pad = 0; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2417 | addr->nl_pid = NETLINK_CB(skb).portid; |
Patrick McHardy | d629b83 | 2005-08-14 19:27:50 -0700 | [diff] [blame] | 2418 | addr->nl_groups = netlink_group_mask(NETLINK_CB(skb).dst_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2419 | msg->msg_namelen = sizeof(*addr); |
| 2420 | } |
| 2421 | |
Patrick McHardy | cc9a06c | 2006-03-12 20:34:27 -0800 | [diff] [blame] | 2422 | if (nlk->flags & NETLINK_RECV_PKTINFO) |
| 2423 | netlink_cmsg_recv_pktinfo(msg, skb); |
| 2424 | |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2425 | memset(&scm, 0, sizeof(scm)); |
| 2426 | scm.creds = *NETLINK_CREDS(skb); |
Patrick McHardy | 188ccb5 | 2007-05-03 03:27:01 -0700 | [diff] [blame] | 2427 | if (flags & MSG_TRUNC) |
Johannes Berg | 68d6ac6 | 2010-08-15 21:20:44 +0000 | [diff] [blame] | 2428 | copied = data_skb->len; |
David S. Miller | daa3766 | 2010-08-15 23:21:50 -0700 | [diff] [blame] | 2429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | skb_free_datagram(sk, skb); |
| 2431 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2432 | if (nlk->cb_running && |
| 2433 | atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2) { |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2434 | ret = netlink_dump(sk); |
| 2435 | if (ret) { |
Ben Pfaff | ac30ef8 | 2014-07-09 10:31:22 -0700 | [diff] [blame] | 2436 | sk->sk_err = -ret; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2437 | sk->sk_error_report(sk); |
| 2438 | } |
| 2439 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2440 | |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2441 | scm_recv(sock, msg, &scm, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2442 | out: |
| 2443 | netlink_rcv_wake(sk); |
| 2444 | return err ? : copied; |
| 2445 | } |
| 2446 | |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 2447 | static void netlink_data_ready(struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2448 | { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2449 | BUG(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2450 | } |
| 2451 | |
| 2452 | /* |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 2453 | * We export these functions to other modules. They provide a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2454 | * complete set of kernel non-blocking support for message |
| 2455 | * queueing. |
| 2456 | */ |
| 2457 | |
| 2458 | struct sock * |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 2459 | __netlink_kernel_create(struct net *net, int unit, struct module *module, |
| 2460 | struct netlink_kernel_cfg *cfg) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2461 | { |
| 2462 | struct socket *sock; |
| 2463 | struct sock *sk; |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2464 | struct netlink_sock *nlk; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2465 | struct listeners *listeners = NULL; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2466 | struct mutex *cb_mutex = cfg ? cfg->cb_mutex : NULL; |
| 2467 | unsigned int groups; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2468 | |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 2469 | BUG_ON(!nl_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2470 | |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2471 | if (unit < 0 || unit >= MAX_LINKS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2472 | return NULL; |
| 2473 | |
| 2474 | if (sock_create_lite(PF_NETLINK, SOCK_DGRAM, unit, &sock)) |
| 2475 | return NULL; |
| 2476 | |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 2477 | /* |
| 2478 | * We have to just have a reference on the net from sk, but don't |
| 2479 | * get_net it. Besides, we cannot get and then put the net here. |
| 2480 | * So we create one inside init_net and the move it to net. |
| 2481 | */ |
| 2482 | |
| 2483 | if (__netlink_create(&init_net, sock, cb_mutex, unit) < 0) |
| 2484 | goto out_sock_release_nosk; |
| 2485 | |
| 2486 | sk = sock->sk; |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 2487 | sk_change_net(sk, net); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2488 | |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2489 | if (!cfg || cfg->groups < 32) |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2490 | groups = 32; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2491 | else |
| 2492 | groups = cfg->groups; |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2493 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2494 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2495 | if (!listeners) |
| 2496 | goto out_sock_release; |
| 2497 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2498 | sk->sk_data_ready = netlink_data_ready; |
Pablo Neira Ayuso | a31f2d1 | 2012-06-29 06:15:21 +0000 | [diff] [blame] | 2499 | if (cfg && cfg->input) |
| 2500 | nlk_sk(sk)->netlink_rcv = cfg->input; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2501 | |
Herbert Xu | 8ea65f4 | 2015-01-26 14:02:56 +1100 | [diff] [blame] | 2502 | if (netlink_insert(sk, 0)) |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2503 | goto out_sock_release; |
| 2504 | |
| 2505 | nlk = nlk_sk(sk); |
| 2506 | nlk->flags |= NETLINK_KERNEL_SOCKET; |
| 2507 | |
| 2508 | netlink_table_grab(); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2509 | if (!nl_table[unit].registered) { |
| 2510 | nl_table[unit].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2511 | rcu_assign_pointer(nl_table[unit].listeners, listeners); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2512 | nl_table[unit].cb_mutex = cb_mutex; |
| 2513 | nl_table[unit].module = module; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 2514 | if (cfg) { |
| 2515 | nl_table[unit].bind = cfg->bind; |
Hiroaki SHIMODA | 6251edd | 2014-11-13 04:24:10 +0900 | [diff] [blame] | 2516 | nl_table[unit].unbind = cfg->unbind; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 2517 | nl_table[unit].flags = cfg->flags; |
Gao feng | da12c90 | 2013-06-06 14:49:11 +0800 | [diff] [blame] | 2518 | if (cfg->compare) |
| 2519 | nl_table[unit].compare = cfg->compare; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 2520 | } |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2521 | nl_table[unit].registered = 1; |
Jesper Juhl | f937f1f46 | 2007-10-15 01:39:12 -0700 | [diff] [blame] | 2522 | } else { |
| 2523 | kfree(listeners); |
Denis V. Lunev | 869e58f | 2008-01-18 23:53:31 -0800 | [diff] [blame] | 2524 | nl_table[unit].registered++; |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2525 | } |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2526 | netlink_table_ungrab(); |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2527 | return sk; |
| 2528 | |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2529 | out_sock_release: |
Patrick McHardy | 4277a08 | 2006-03-20 18:52:01 -0800 | [diff] [blame] | 2530 | kfree(listeners); |
Denis V. Lunev | 9dfbec1 | 2008-02-29 11:17:56 -0800 | [diff] [blame] | 2531 | netlink_kernel_release(sk); |
Pavel Emelyanov | 23fe186 | 2008-01-30 19:31:06 -0800 | [diff] [blame] | 2532 | return NULL; |
| 2533 | |
| 2534 | out_sock_release_nosk: |
Harald Welte | 4fdb3bb | 2005-08-09 19:40:55 -0700 | [diff] [blame] | 2535 | sock_release(sock); |
Patrick McHardy | 77247bb | 2005-08-14 19:27:13 -0700 | [diff] [blame] | 2536 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2537 | } |
Pablo Neira Ayuso | 9f00d97 | 2012-09-08 02:53:54 +0000 | [diff] [blame] | 2538 | EXPORT_SYMBOL(__netlink_kernel_create); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 2539 | |
| 2540 | void |
| 2541 | netlink_kernel_release(struct sock *sk) |
| 2542 | { |
Denis V. Lunev | edf0208 | 2008-02-29 11:18:32 -0800 | [diff] [blame] | 2543 | sk_release_kernel(sk); |
Denis V. Lunev | b7c6ba6 | 2008-01-28 14:41:19 -0800 | [diff] [blame] | 2544 | } |
| 2545 | EXPORT_SYMBOL(netlink_kernel_release); |
| 2546 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2547 | int __netlink_change_ngroups(struct sock *sk, unsigned int groups) |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2548 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2549 | struct listeners *new, *old; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2550 | struct netlink_table *tbl = &nl_table[sk->sk_protocol]; |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2551 | |
| 2552 | if (groups < 32) |
| 2553 | groups = 32; |
| 2554 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2555 | if (NLGRPSZ(tbl->groups) < NLGRPSZ(groups)) { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2556 | new = kzalloc(sizeof(*new) + NLGRPSZ(groups), GFP_ATOMIC); |
| 2557 | if (!new) |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2558 | return -ENOMEM; |
Eric Dumazet | 6d772ac | 2012-10-18 03:21:55 +0000 | [diff] [blame] | 2559 | old = nl_deref_protected(tbl->listeners); |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 2560 | memcpy(new->masks, old->masks, NLGRPSZ(tbl->groups)); |
| 2561 | rcu_assign_pointer(tbl->listeners, new); |
| 2562 | |
Lai Jiangshan | 37b6b93 | 2011-03-15 18:01:42 +0800 | [diff] [blame] | 2563 | kfree_rcu(old, rcu); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2564 | } |
| 2565 | tbl->groups = groups; |
| 2566 | |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2567 | return 0; |
| 2568 | } |
| 2569 | |
| 2570 | /** |
| 2571 | * netlink_change_ngroups - change number of multicast groups |
| 2572 | * |
| 2573 | * This changes the number of multicast groups that are available |
| 2574 | * on a certain netlink family. Note that it is not possible to |
| 2575 | * change the number of groups to below 32. Also note that it does |
| 2576 | * not implicitly call netlink_clear_multicast_users() when the |
| 2577 | * number of groups is reduced. |
| 2578 | * |
| 2579 | * @sk: The kernel netlink socket, as returned by netlink_kernel_create(). |
| 2580 | * @groups: The new number of groups. |
| 2581 | */ |
| 2582 | int netlink_change_ngroups(struct sock *sk, unsigned int groups) |
| 2583 | { |
| 2584 | int err; |
| 2585 | |
| 2586 | netlink_table_grab(); |
| 2587 | err = __netlink_change_ngroups(sk, groups); |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2588 | netlink_table_ungrab(); |
Johannes Berg | d136f1b | 2009-09-12 03:03:15 +0000 | [diff] [blame] | 2589 | |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2590 | return err; |
| 2591 | } |
Johannes Berg | b4ff4f0 | 2007-07-18 15:46:06 -0700 | [diff] [blame] | 2592 | |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 2593 | void __netlink_clear_multicast_users(struct sock *ksk, unsigned int group) |
| 2594 | { |
| 2595 | struct sock *sk; |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 2596 | struct netlink_table *tbl = &nl_table[ksk->sk_protocol]; |
| 2597 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 2598 | sk_for_each_bound(sk, &tbl->mc_list) |
Johannes Berg | b827357 | 2009-09-24 15:44:05 -0700 | [diff] [blame] | 2599 | netlink_update_socket_mc(nlk_sk(sk), group, 0); |
| 2600 | } |
| 2601 | |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2602 | struct nlmsghdr * |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2603 | __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] | 2604 | { |
| 2605 | struct nlmsghdr *nlh; |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 2606 | int size = nlmsg_msg_size(len); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2607 | |
Wang Yufen | 23b4567 | 2014-02-17 16:53:32 +0800 | [diff] [blame] | 2608 | nlh = (struct nlmsghdr *)skb_put(skb, NLMSG_ALIGN(size)); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2609 | nlh->nlmsg_type = type; |
| 2610 | nlh->nlmsg_len = size; |
| 2611 | nlh->nlmsg_flags = flags; |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2612 | nlh->nlmsg_pid = portid; |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2613 | nlh->nlmsg_seq = seq; |
| 2614 | if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0) |
Hong zhi guo | 573ce26 | 2013-03-27 06:47:04 +0000 | [diff] [blame] | 2615 | memset(nlmsg_data(nlh) + len, 0, NLMSG_ALIGN(size) - size); |
Denys Vlasenko | a46621a | 2012-01-30 15:22:06 -0500 | [diff] [blame] | 2616 | return nlh; |
| 2617 | } |
| 2618 | EXPORT_SYMBOL(__nlmsg_put); |
| 2619 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2620 | /* |
| 2621 | * It looks a bit ugly. |
| 2622 | * It would be better to create kernel thread. |
| 2623 | */ |
| 2624 | |
| 2625 | static int netlink_dump(struct sock *sk) |
| 2626 | { |
| 2627 | struct netlink_sock *nlk = nlk_sk(sk); |
| 2628 | struct netlink_callback *cb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2629 | struct sk_buff *skb = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2630 | struct nlmsghdr *nlh; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2631 | int len, err = -ENOBUFS; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2632 | int alloc_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2633 | |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2634 | mutex_lock(nlk->cb_mutex); |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2635 | if (!nlk->cb_running) { |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2636 | err = -EINVAL; |
| 2637 | goto errout_skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2638 | } |
| 2639 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2640 | cb = &nlk->cb; |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2641 | alloc_size = max_t(int, cb->min_dump_alloc, NLMSG_GOODSIZE); |
| 2642 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2643 | if (!netlink_rx_is_mmaped(sk) && |
| 2644 | atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) |
| 2645 | goto errout_skb; |
Eric Dumazet | 9063e21 | 2014-03-07 12:02:33 -0800 | [diff] [blame] | 2646 | |
| 2647 | /* NLMSG_GOODSIZE is small to avoid high order allocations being |
| 2648 | * required, but it makes sense to _attempt_ a 16K bytes allocation |
| 2649 | * to reduce number of system calls on dump operations, if user |
| 2650 | * ever provided a big enough buffer. |
| 2651 | */ |
| 2652 | if (alloc_size < nlk->max_recvmsg_len) { |
| 2653 | skb = netlink_alloc_skb(sk, |
| 2654 | nlk->max_recvmsg_len, |
| 2655 | nlk->portid, |
| 2656 | GFP_KERNEL | |
| 2657 | __GFP_NOWARN | |
| 2658 | __GFP_NORETRY); |
| 2659 | /* available room should be exact amount to avoid MSG_TRUNC */ |
| 2660 | if (skb) |
| 2661 | skb_reserve(skb, skb_tailroom(skb) - |
| 2662 | nlk->max_recvmsg_len); |
| 2663 | } |
| 2664 | if (!skb) |
| 2665 | skb = netlink_alloc_skb(sk, alloc_size, nlk->portid, |
| 2666 | GFP_KERNEL); |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2667 | if (!skb) |
Dan Carpenter | c63d6ea | 2011-06-15 03:11:42 +0000 | [diff] [blame] | 2668 | goto errout_skb; |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2669 | netlink_skb_set_owner_r(skb, sk); |
Greg Rose | c7ac867 | 2011-06-10 01:27:09 +0000 | [diff] [blame] | 2670 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2671 | len = cb->dump(skb, cb); |
| 2672 | |
| 2673 | if (len > 0) { |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2674 | mutex_unlock(nlk->cb_mutex); |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 2675 | |
| 2676 | if (sk_filter(sk, skb)) |
| 2677 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 2678 | else |
| 2679 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2680 | return 0; |
| 2681 | } |
| 2682 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2683 | nlh = nlmsg_put_answer(skb, cb, NLMSG_DONE, sizeof(len), NLM_F_MULTI); |
| 2684 | if (!nlh) |
| 2685 | goto errout_skb; |
| 2686 | |
Johannes Berg | 670dc28 | 2011-06-20 13:40:46 +0200 | [diff] [blame] | 2687 | nl_dump_check_consistent(cb, nlh); |
| 2688 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2689 | memcpy(nlmsg_data(nlh), &len, sizeof(len)); |
| 2690 | |
Stephen Hemminger | b1153f2 | 2008-03-21 15:46:12 -0700 | [diff] [blame] | 2691 | if (sk_filter(sk, skb)) |
| 2692 | kfree_skb(skb); |
Eric Dumazet | 4a7e7c2 | 2012-04-05 22:17:46 +0000 | [diff] [blame] | 2693 | else |
| 2694 | __netlink_sendskb(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2695 | |
Thomas Graf | a8f74b2 | 2005-11-10 02:25:52 +0100 | [diff] [blame] | 2696 | if (cb->done) |
| 2697 | cb->done(cb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2698 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2699 | nlk->cb_running = false; |
| 2700 | mutex_unlock(nlk->cb_mutex); |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2701 | module_put(cb->module); |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2702 | consume_skb(cb->skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2703 | return 0; |
Thomas Graf | 1797754 | 2005-06-18 22:53:48 -0700 | [diff] [blame] | 2704 | |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2705 | errout_skb: |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2706 | mutex_unlock(nlk->cb_mutex); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2707 | kfree_skb(skb); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2708 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2709 | } |
| 2710 | |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2711 | int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb, |
| 2712 | const struct nlmsghdr *nlh, |
| 2713 | struct netlink_dump_control *control) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2714 | { |
| 2715 | struct netlink_callback *cb; |
| 2716 | struct sock *sk; |
| 2717 | struct netlink_sock *nlk; |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2718 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2719 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2720 | /* Memory mapped dump requests need to be copied to avoid looping |
| 2721 | * on the pending state in netlink_mmap_sendmsg() while the CB hold |
| 2722 | * a reference to the skb. |
| 2723 | */ |
| 2724 | if (netlink_skb_is_mmaped(skb)) { |
| 2725 | skb = skb_copy(skb, GFP_KERNEL); |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2726 | if (skb == NULL) |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2727 | return -ENOBUFS; |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2728 | } else |
| 2729 | atomic_inc(&skb->users); |
| 2730 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2731 | sk = netlink_lookup(sock_net(ssk), ssk->sk_protocol, NETLINK_CB(skb).portid); |
| 2732 | if (sk == NULL) { |
| 2733 | ret = -ECONNREFUSED; |
| 2734 | goto error_free; |
| 2735 | } |
| 2736 | |
| 2737 | nlk = nlk_sk(sk); |
| 2738 | mutex_lock(nlk->cb_mutex); |
| 2739 | /* A dump is in progress... */ |
| 2740 | if (nlk->cb_running) { |
| 2741 | ret = -EBUSY; |
| 2742 | goto error_unlock; |
| 2743 | } |
| 2744 | /* add reference of module which cb->dump belongs to */ |
| 2745 | if (!try_module_get(control->module)) { |
| 2746 | ret = -EPROTONOSUPPORT; |
| 2747 | goto error_unlock; |
| 2748 | } |
| 2749 | |
| 2750 | cb = &nlk->cb; |
| 2751 | memset(cb, 0, sizeof(*cb)); |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 2752 | cb->dump = control->dump; |
| 2753 | cb->done = control->done; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2754 | cb->nlh = nlh; |
Pablo Neira Ayuso | 7175c88 | 2012-02-24 14:30:16 +0000 | [diff] [blame] | 2755 | cb->data = control->data; |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2756 | cb->module = control->module; |
Pablo Neira Ayuso | 80d326f | 2012-02-24 14:30:15 +0000 | [diff] [blame] | 2757 | cb->min_dump_alloc = control->min_dump_alloc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2758 | cb->skb = skb; |
| 2759 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2760 | nlk->cb_running = true; |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2761 | |
Patrick McHardy | af65bdf | 2007-04-20 14:14:21 -0700 | [diff] [blame] | 2762 | mutex_unlock(nlk->cb_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2763 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2764 | ret = netlink_dump(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2765 | sock_put(sk); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2766 | |
Andrey Vagin | b44d211 | 2011-02-21 02:40:47 +0000 | [diff] [blame] | 2767 | if (ret) |
| 2768 | return ret; |
| 2769 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2770 | /* We successfully started a dump, by returning -EINTR we |
| 2771 | * signal not to send ACK even if it was requested. |
| 2772 | */ |
| 2773 | return -EINTR; |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 2774 | |
| 2775 | error_unlock: |
| 2776 | sock_put(sk); |
| 2777 | mutex_unlock(nlk->cb_mutex); |
| 2778 | error_free: |
| 2779 | kfree_skb(skb); |
| 2780 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2781 | } |
Gao feng | 6dc878a | 2012-10-04 20:15:48 +0000 | [diff] [blame] | 2782 | EXPORT_SYMBOL(__netlink_dump_start); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2783 | |
| 2784 | void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err) |
| 2785 | { |
| 2786 | struct sk_buff *skb; |
| 2787 | struct nlmsghdr *rep; |
| 2788 | struct nlmsgerr *errmsg; |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2789 | size_t payload = sizeof(*errmsg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2790 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 2791 | /* error messages get the original request appened */ |
| 2792 | if (err) |
| 2793 | payload += nlmsg_len(nlh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2794 | |
Patrick McHardy | f9c2288 | 2013-04-17 06:47:04 +0000 | [diff] [blame] | 2795 | skb = netlink_alloc_skb(in_skb->sk, nlmsg_total_size(payload), |
| 2796 | NETLINK_CB(in_skb).portid, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2797 | if (!skb) { |
| 2798 | struct sock *sk; |
| 2799 | |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 2800 | sk = netlink_lookup(sock_net(in_skb->sk), |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 2801 | in_skb->sk->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2802 | NETLINK_CB(in_skb).portid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2803 | if (sk) { |
| 2804 | sk->sk_err = ENOBUFS; |
| 2805 | sk->sk_error_report(sk); |
| 2806 | sock_put(sk); |
| 2807 | } |
| 2808 | return; |
| 2809 | } |
| 2810 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2811 | rep = __nlmsg_put(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, |
John Fastabend | 5dba93a | 2009-09-25 13:11:44 +0000 | [diff] [blame] | 2812 | NLMSG_ERROR, payload, 0); |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2813 | errmsg = nlmsg_data(rep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2814 | errmsg->error = err; |
Thomas Graf | bf8b79e | 2006-08-04 23:03:29 -0700 | [diff] [blame] | 2815 | memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(*nlh)); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2816 | 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] | 2817 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2818 | EXPORT_SYMBOL(netlink_ack); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2819 | |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2820 | 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] | 2821 | struct nlmsghdr *)) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2822 | { |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2823 | struct nlmsghdr *nlh; |
| 2824 | int err; |
| 2825 | |
| 2826 | while (skb->len >= nlmsg_total_size(0)) { |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2827 | int msglen; |
| 2828 | |
Arnaldo Carvalho de Melo | b529ccf | 2007-04-25 19:08:35 -0700 | [diff] [blame] | 2829 | nlh = nlmsg_hdr(skb); |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2830 | err = 0; |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2831 | |
Martin Murray | ad8e4b7 | 2006-01-10 13:02:29 -0800 | [diff] [blame] | 2832 | if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2833 | return 0; |
| 2834 | |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2835 | /* Only requests are handled by the kernel */ |
| 2836 | if (!(nlh->nlmsg_flags & NLM_F_REQUEST)) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2837 | goto ack; |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2838 | |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 2839 | /* Skip control messages */ |
| 2840 | if (nlh->nlmsg_type < NLMSG_MIN_TYPE) |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2841 | goto ack; |
Thomas Graf | 45e7ae7 | 2007-03-22 23:29:10 -0700 | [diff] [blame] | 2842 | |
Thomas Graf | 1d00a4e | 2007-03-22 23:30:12 -0700 | [diff] [blame] | 2843 | err = cb(skb, nlh); |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2844 | if (err == -EINTR) |
| 2845 | goto skip; |
| 2846 | |
| 2847 | ack: |
Thomas Graf | d35b685 | 2007-03-22 23:28:46 -0700 | [diff] [blame] | 2848 | if (nlh->nlmsg_flags & NLM_F_ACK || err) |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2849 | netlink_ack(skb, nlh, err); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2850 | |
Denis V. Lunev | 5c58298 | 2007-10-23 20:29:25 -0700 | [diff] [blame] | 2851 | skip: |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2852 | msglen = NLMSG_ALIGN(nlh->nlmsg_len); |
Denis V. Lunev | cd40b7d | 2007-10-10 21:15:29 -0700 | [diff] [blame] | 2853 | if (msglen > skb->len) |
| 2854 | msglen = skb->len; |
| 2855 | skb_pull(skb, msglen); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2856 | } |
| 2857 | |
| 2858 | return 0; |
| 2859 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2860 | EXPORT_SYMBOL(netlink_rcv_skb); |
Thomas Graf | 82ace47 | 2005-11-10 02:25:53 +0100 | [diff] [blame] | 2861 | |
| 2862 | /** |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2863 | * nlmsg_notify - send a notification netlink message |
| 2864 | * @sk: netlink socket to use |
| 2865 | * @skb: notification message |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2866 | * @portid: destination netlink portid for reports or 0 |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2867 | * @group: destination multicast group or 0 |
| 2868 | * @report: 1 to report back, 0 to disable |
| 2869 | * @flags: allocation flags |
| 2870 | */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2871 | int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid, |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2872 | unsigned int group, int report, gfp_t flags) |
| 2873 | { |
| 2874 | int err = 0; |
| 2875 | |
| 2876 | if (group) { |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2877 | int exclude_portid = 0; |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2878 | |
| 2879 | if (report) { |
| 2880 | atomic_inc(&skb->users); |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2881 | exclude_portid = portid; |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2882 | } |
| 2883 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2884 | /* errors reported via destination sk->sk_err, but propagate |
| 2885 | * delivery errors if NETLINK_BROADCAST_ERROR flag is set */ |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2886 | err = nlmsg_multicast(sk, skb, exclude_portid, group, flags); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2887 | } |
| 2888 | |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2889 | if (report) { |
| 2890 | int err2; |
| 2891 | |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 2892 | err2 = nlmsg_unicast(sk, skb, portid); |
Pablo Neira Ayuso | 1ce85fe | 2009-02-24 23:18:28 -0800 | [diff] [blame] | 2893 | if (!err || err == -ESRCH) |
| 2894 | err = err2; |
| 2895 | } |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2896 | |
| 2897 | return err; |
| 2898 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 2899 | EXPORT_SYMBOL(nlmsg_notify); |
Thomas Graf | d387f6a | 2006-08-15 00:31:06 -0700 | [diff] [blame] | 2900 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2901 | #ifdef CONFIG_PROC_FS |
| 2902 | struct nl_seq_iter { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2903 | struct seq_net_private p; |
Herbert Xu | 56d28b1 | 2015-02-04 07:33:24 +1100 | [diff] [blame] | 2904 | struct rhashtable_iter hti; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2905 | int link; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2906 | }; |
| 2907 | |
Herbert Xu | 56d28b1 | 2015-02-04 07:33:24 +1100 | [diff] [blame] | 2908 | static int netlink_walk_start(struct nl_seq_iter *iter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2909 | { |
Herbert Xu | 56d28b1 | 2015-02-04 07:33:24 +1100 | [diff] [blame] | 2910 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2911 | |
Herbert Xu | 56d28b1 | 2015-02-04 07:33:24 +1100 | [diff] [blame] | 2912 | err = rhashtable_walk_init(&nl_table[iter->link].hash, &iter->hti); |
| 2913 | if (err) { |
| 2914 | iter->link = MAX_LINKS; |
| 2915 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2916 | } |
Herbert Xu | 56d28b1 | 2015-02-04 07:33:24 +1100 | [diff] [blame] | 2917 | |
| 2918 | err = rhashtable_walk_start(&iter->hti); |
| 2919 | return err == -EAGAIN ? 0 : err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2920 | } |
| 2921 | |
Herbert Xu | 56d28b1 | 2015-02-04 07:33:24 +1100 | [diff] [blame] | 2922 | static void netlink_walk_stop(struct nl_seq_iter *iter) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2923 | { |
Herbert Xu | 56d28b1 | 2015-02-04 07:33:24 +1100 | [diff] [blame] | 2924 | rhashtable_walk_stop(&iter->hti); |
| 2925 | rhashtable_walk_exit(&iter->hti); |
| 2926 | } |
| 2927 | |
| 2928 | static void *__netlink_seq_next(struct seq_file *seq) |
| 2929 | { |
| 2930 | struct nl_seq_iter *iter = seq->private; |
| 2931 | struct netlink_sock *nlk; |
| 2932 | |
| 2933 | do { |
| 2934 | for (;;) { |
| 2935 | int err; |
| 2936 | |
| 2937 | nlk = rhashtable_walk_next(&iter->hti); |
| 2938 | |
| 2939 | if (IS_ERR(nlk)) { |
| 2940 | if (PTR_ERR(nlk) == -EAGAIN) |
| 2941 | continue; |
| 2942 | |
| 2943 | return nlk; |
| 2944 | } |
| 2945 | |
| 2946 | if (nlk) |
| 2947 | break; |
| 2948 | |
| 2949 | netlink_walk_stop(iter); |
| 2950 | if (++iter->link >= MAX_LINKS) |
| 2951 | return NULL; |
| 2952 | |
| 2953 | err = netlink_walk_start(iter); |
| 2954 | if (err) |
| 2955 | return ERR_PTR(err); |
| 2956 | } |
| 2957 | } while (sock_net(&nlk->sk) != seq_file_net(seq)); |
| 2958 | |
| 2959 | return nlk; |
| 2960 | } |
| 2961 | |
| 2962 | static void *netlink_seq_start(struct seq_file *seq, loff_t *posp) |
| 2963 | { |
| 2964 | struct nl_seq_iter *iter = seq->private; |
| 2965 | void *obj = SEQ_START_TOKEN; |
| 2966 | loff_t pos; |
| 2967 | int err; |
| 2968 | |
| 2969 | iter->link = 0; |
| 2970 | |
| 2971 | err = netlink_walk_start(iter); |
| 2972 | if (err) |
| 2973 | return ERR_PTR(err); |
| 2974 | |
| 2975 | for (pos = *posp; pos && obj && !IS_ERR(obj); pos--) |
| 2976 | obj = __netlink_seq_next(seq); |
| 2977 | |
| 2978 | return obj; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2979 | } |
| 2980 | |
| 2981 | static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2982 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2983 | ++*pos; |
Herbert Xu | 56d28b1 | 2015-02-04 07:33:24 +1100 | [diff] [blame] | 2984 | return __netlink_seq_next(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2985 | } |
| 2986 | |
| 2987 | static void netlink_seq_stop(struct seq_file *seq, void *v) |
| 2988 | { |
Herbert Xu | 56d28b1 | 2015-02-04 07:33:24 +1100 | [diff] [blame] | 2989 | struct nl_seq_iter *iter = seq->private; |
| 2990 | |
| 2991 | if (iter->link >= MAX_LINKS) |
| 2992 | return; |
| 2993 | |
| 2994 | netlink_walk_stop(iter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2995 | } |
| 2996 | |
| 2997 | |
| 2998 | static int netlink_seq_show(struct seq_file *seq, void *v) |
| 2999 | { |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 3000 | if (v == SEQ_START_TOKEN) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3001 | seq_puts(seq, |
| 3002 | "sk Eth Pid Groups " |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 3003 | "Rmem Wmem Dump Locks Drops Inode\n"); |
Eric Dumazet | 658cb35 | 2012-04-22 21:30:21 +0000 | [diff] [blame] | 3004 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3005 | struct sock *s = v; |
| 3006 | struct netlink_sock *nlk = nlk_sk(s); |
| 3007 | |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 3008 | 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] | 3009 | s, |
| 3010 | s->sk_protocol, |
Eric W. Biederman | 15e4730 | 2012-09-07 20:12:54 +0000 | [diff] [blame] | 3011 | nlk->portid, |
Patrick McHardy | 513c250 | 2005-09-06 15:43:59 -0700 | [diff] [blame] | 3012 | nlk->groups ? (u32)nlk->groups[0] : 0, |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 3013 | sk_rmem_alloc_get(s), |
| 3014 | sk_wmem_alloc_get(s), |
Pravin B Shelar | 16b304f | 2013-08-15 15:31:06 -0700 | [diff] [blame] | 3015 | nlk->cb_running, |
Pablo Neira Ayuso | 38938bf | 2009-03-24 16:37:55 -0700 | [diff] [blame] | 3016 | atomic_read(&s->sk_refcnt), |
Masatake YAMATO | cf0aa4e | 2010-02-27 19:45:37 +0000 | [diff] [blame] | 3017 | atomic_read(&s->sk_drops), |
| 3018 | sock_i_ino(s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3019 | ); |
| 3020 | |
| 3021 | } |
| 3022 | return 0; |
| 3023 | } |
| 3024 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 3025 | static const struct seq_operations netlink_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3026 | .start = netlink_seq_start, |
| 3027 | .next = netlink_seq_next, |
| 3028 | .stop = netlink_seq_stop, |
| 3029 | .show = netlink_seq_show, |
| 3030 | }; |
| 3031 | |
| 3032 | |
| 3033 | static int netlink_seq_open(struct inode *inode, struct file *file) |
| 3034 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3035 | return seq_open_net(inode, file, &netlink_seq_ops, |
| 3036 | sizeof(struct nl_seq_iter)); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3037 | } |
| 3038 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 3039 | static const struct file_operations netlink_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3040 | .owner = THIS_MODULE, |
| 3041 | .open = netlink_seq_open, |
| 3042 | .read = seq_read, |
| 3043 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 3044 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3045 | }; |
| 3046 | |
| 3047 | #endif |
| 3048 | |
| 3049 | int netlink_register_notifier(struct notifier_block *nb) |
| 3050 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 3051 | return atomic_notifier_chain_register(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3052 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 3053 | EXPORT_SYMBOL(netlink_register_notifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3054 | |
| 3055 | int netlink_unregister_notifier(struct notifier_block *nb) |
| 3056 | { |
Alan Stern | e041c68 | 2006-03-27 01:16:30 -0800 | [diff] [blame] | 3057 | return atomic_notifier_chain_unregister(&netlink_chain, nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3058 | } |
Patrick McHardy | 6ac552f | 2007-12-04 00:19:38 -0800 | [diff] [blame] | 3059 | EXPORT_SYMBOL(netlink_unregister_notifier); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 3060 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 3061 | static const struct proto_ops netlink_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3062 | .family = PF_NETLINK, |
| 3063 | .owner = THIS_MODULE, |
| 3064 | .release = netlink_release, |
| 3065 | .bind = netlink_bind, |
| 3066 | .connect = netlink_connect, |
| 3067 | .socketpair = sock_no_socketpair, |
| 3068 | .accept = sock_no_accept, |
| 3069 | .getname = netlink_getname, |
Patrick McHardy | 9652e93 | 2013-04-17 06:47:02 +0000 | [diff] [blame] | 3070 | .poll = netlink_poll, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3071 | .ioctl = sock_no_ioctl, |
| 3072 | .listen = sock_no_listen, |
| 3073 | .shutdown = sock_no_shutdown, |
Patrick McHardy | 9a4595b | 2005-08-15 12:32:15 -0700 | [diff] [blame] | 3074 | .setsockopt = netlink_setsockopt, |
| 3075 | .getsockopt = netlink_getsockopt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3076 | .sendmsg = netlink_sendmsg, |
| 3077 | .recvmsg = netlink_recvmsg, |
Patrick McHardy | ccdfcc3 | 2013-04-17 06:47:01 +0000 | [diff] [blame] | 3078 | .mmap = netlink_mmap, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3079 | .sendpage = sock_no_sendpage, |
| 3080 | }; |
| 3081 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 3082 | static const struct net_proto_family netlink_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3083 | .family = PF_NETLINK, |
| 3084 | .create = netlink_create, |
| 3085 | .owner = THIS_MODULE, /* for consistency 8) */ |
| 3086 | }; |
| 3087 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3088 | static int __net_init netlink_net_init(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3089 | { |
| 3090 | #ifdef CONFIG_PROC_FS |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 3091 | if (!proc_create("netlink", 0, net->proc_net, &netlink_seq_fops)) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3092 | return -ENOMEM; |
| 3093 | #endif |
| 3094 | return 0; |
| 3095 | } |
| 3096 | |
Pavel Emelyanov | 4665079 | 2007-10-08 20:38:39 -0700 | [diff] [blame] | 3097 | static void __net_exit netlink_net_exit(struct net *net) |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3098 | { |
| 3099 | #ifdef CONFIG_PROC_FS |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 3100 | remove_proc_entry("netlink", net->proc_net); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3101 | #endif |
| 3102 | } |
| 3103 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3104 | static void __init netlink_add_usersock_entry(void) |
| 3105 | { |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3106 | struct listeners *listeners; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3107 | int groups = 32; |
| 3108 | |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3109 | listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3110 | if (!listeners) |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3111 | panic("netlink_add_usersock_entry: Cannot allocate listeners\n"); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3112 | |
| 3113 | netlink_table_grab(); |
| 3114 | |
| 3115 | nl_table[NETLINK_USERSOCK].groups = groups; |
Eric Dumazet | 5c398dc | 2010-10-24 04:27:10 +0000 | [diff] [blame] | 3116 | rcu_assign_pointer(nl_table[NETLINK_USERSOCK].listeners, listeners); |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3117 | nl_table[NETLINK_USERSOCK].module = THIS_MODULE; |
| 3118 | nl_table[NETLINK_USERSOCK].registered = 1; |
Pablo Neira Ayuso | 9785e10 | 2012-09-08 02:53:53 +0000 | [diff] [blame] | 3119 | nl_table[NETLINK_USERSOCK].flags = NL_CFG_F_NONROOT_SEND; |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3120 | |
| 3121 | netlink_table_ungrab(); |
| 3122 | } |
| 3123 | |
Denis V. Lunev | 022cbae | 2007-11-13 03:23:50 -0800 | [diff] [blame] | 3124 | static struct pernet_operations __net_initdata netlink_net_ops = { |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3125 | .init = netlink_net_init, |
| 3126 | .exit = netlink_net_exit, |
| 3127 | }; |
| 3128 | |
Patrick McHardy | 49f7b33 | 2015-03-25 13:07:45 +0000 | [diff] [blame] | 3129 | static inline u32 netlink_hash(const void *data, u32 len, u32 seed) |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 3130 | { |
| 3131 | const struct netlink_sock *nlk = data; |
| 3132 | struct netlink_compare_arg arg; |
| 3133 | |
| 3134 | netlink_compare_arg_init(&arg, sock_net(&nlk->sk), nlk->portid); |
Herbert Xu | 11b58ba | 2015-03-24 00:50:22 +1100 | [diff] [blame] | 3135 | return jhash2((u32 *)&arg, netlink_compare_arg_len / sizeof(u32), seed); |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 3136 | } |
| 3137 | |
| 3138 | static const struct rhashtable_params netlink_rhashtable_params = { |
| 3139 | .head_offset = offsetof(struct netlink_sock, node), |
| 3140 | .key_len = netlink_compare_arg_len, |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 3141 | .obj_hashfn = netlink_hash, |
| 3142 | .obj_cmpfn = netlink_compare, |
Thomas Graf | b5e2c15 | 2015-03-24 20:42:19 +0000 | [diff] [blame] | 3143 | .automatic_shrinking = true, |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 3144 | }; |
| 3145 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3146 | static int __init netlink_proto_init(void) |
| 3147 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3148 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3149 | int err = proto_register(&netlink_proto, 0); |
| 3150 | |
| 3151 | if (err != 0) |
| 3152 | goto out; |
| 3153 | |
YOSHIFUJI Hideaki / 吉藤英明 | fab2574 | 2013-01-09 07:19:48 +0000 | [diff] [blame] | 3154 | 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] | 3155 | |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 3156 | nl_table = kcalloc(MAX_LINKS, sizeof(*nl_table), GFP_KERNEL); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 3157 | if (!nl_table) |
| 3158 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3159 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3160 | for (i = 0; i < MAX_LINKS; i++) { |
Herbert Xu | c428ecd | 2015-03-20 21:57:01 +1100 | [diff] [blame] | 3161 | if (rhashtable_init(&nl_table[i].hash, |
| 3162 | &netlink_rhashtable_params) < 0) { |
Thomas Graf | e341694 | 2014-08-02 11:47:45 +0200 | [diff] [blame] | 3163 | while (--i > 0) |
| 3164 | rhashtable_destroy(&nl_table[i].hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3165 | kfree(nl_table); |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 3166 | goto panic; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3167 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3168 | } |
| 3169 | |
Daniel Borkmann | bcbde0d | 2013-06-21 19:38:07 +0200 | [diff] [blame] | 3170 | INIT_LIST_HEAD(&netlink_tap_all); |
| 3171 | |
David S. Miller | b963ea8 | 2010-08-30 19:08:01 -0700 | [diff] [blame] | 3172 | netlink_add_usersock_entry(); |
| 3173 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3174 | sock_register(&netlink_family_ops); |
Eric W. Biederman | b4b5102 | 2007-09-12 13:05:38 +0200 | [diff] [blame] | 3175 | register_pernet_subsys(&netlink_net_ops); |
YOSHIFUJI Hideaki | 746fac4 | 2007-02-09 23:25:07 +0900 | [diff] [blame] | 3176 | /* The netlink device handler may be needed early. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3177 | rtnetlink_init(); |
| 3178 | out: |
| 3179 | return err; |
Akinobu Mita | fab2caf | 2006-08-29 02:15:24 -0700 | [diff] [blame] | 3180 | panic: |
| 3181 | panic("netlink_init: Cannot allocate nl_table\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3182 | } |
| 3183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3184 | core_initcall(netlink_proto_init); |