| 1 |
1275 |
phoenix |
/*
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| 2 |
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* NETLINK Kernel-user communication protocol.
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| 3 |
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*
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* Authors: Alan Cox <alan@redhat.com>
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* Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
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| 6 |
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Tue Jun 26 14:36:48 MEST 2001 Herbert "herp" Rosmanith
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| 13 |
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* added netlink_proto_exit
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*
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| 15 |
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*/
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| 17 |
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#include <linux/config.h>
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| 18 |
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#include <linux/module.h>
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| 20 |
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#include <linux/kernel.h>
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| 21 |
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#include <linux/init.h>
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#include <linux/major.h>
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#include <linux/signal.h>
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| 24 |
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#include <linux/sched.h>
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| 25 |
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#include <linux/errno.h>
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| 26 |
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#include <linux/string.h>
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| 27 |
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#include <linux/stat.h>
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| 28 |
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#include <linux/socket.h>
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| 29 |
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#include <linux/un.h>
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| 30 |
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#include <linux/fcntl.h>
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| 31 |
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#include <linux/termios.h>
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| 32 |
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#include <linux/sockios.h>
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| 33 |
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#include <linux/net.h>
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| 34 |
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#include <linux/fs.h>
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| 35 |
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#include <linux/slab.h>
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| 36 |
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#include <asm/uaccess.h>
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| 37 |
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#include <linux/skbuff.h>
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| 38 |
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#include <linux/netdevice.h>
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| 39 |
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#include <linux/rtnetlink.h>
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| 40 |
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#include <linux/proc_fs.h>
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| 41 |
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#include <linux/smp_lock.h>
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| 42 |
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#include <linux/notifier.h>
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| 43 |
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#include <net/sock.h>
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| 44 |
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#include <net/scm.h>
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| 45 |
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| 46 |
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#define Nprintk(a...)
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| 47 |
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| 48 |
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#if defined(CONFIG_NETLINK_DEV) || defined(CONFIG_NETLINK_DEV_MODULE)
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| 49 |
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#define NL_EMULATE_DEV
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| 50 |
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#endif
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| 51 |
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| 52 |
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struct netlink_opt
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| 53 |
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{
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| 54 |
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u32 pid;
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| 55 |
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unsigned groups;
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| 56 |
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u32 dst_pid;
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| 57 |
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unsigned dst_groups;
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| 58 |
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unsigned long state;
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| 59 |
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int (*handler)(int unit, struct sk_buff *skb);
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| 60 |
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wait_queue_head_t wait;
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| 61 |
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struct netlink_callback *cb;
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| 62 |
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spinlock_t cb_lock;
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| 63 |
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void (*data_ready)(struct sock *sk, int bytes);
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| 64 |
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};
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| 65 |
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| 66 |
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static struct sock *nl_table[MAX_LINKS];
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| 67 |
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static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait);
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| 68 |
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static unsigned nl_nonroot[MAX_LINKS];
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| 69 |
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| 70 |
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#ifdef NL_EMULATE_DEV
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| 71 |
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static struct socket *netlink_kernel[MAX_LINKS];
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| 72 |
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#endif
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| 73 |
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| 74 |
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static int netlink_dump(struct sock *sk);
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| 75 |
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static void netlink_destroy_callback(struct netlink_callback *cb);
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| 76 |
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| 77 |
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atomic_t netlink_sock_nr;
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| 78 |
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| 79 |
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static rwlock_t nl_table_lock = RW_LOCK_UNLOCKED;
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| 80 |
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static atomic_t nl_table_users = ATOMIC_INIT(0);
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| 81 |
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| 82 |
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static struct notifier_block *netlink_chain;
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| 83 |
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| 84 |
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static void netlink_sock_destruct(struct sock *sk)
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| 85 |
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{
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| 86 |
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skb_queue_purge(&sk->receive_queue);
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| 87 |
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| 88 |
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if (!sk->dead) {
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| 89 |
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printk("Freeing alive netlink socket %p\n", sk);
|
| 90 |
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return;
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| 91 |
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}
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| 92 |
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BUG_TRAP(atomic_read(&sk->rmem_alloc)==0);
|
| 93 |
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BUG_TRAP(atomic_read(&sk->wmem_alloc)==0);
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| 94 |
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BUG_TRAP(sk->protinfo.af_netlink->cb==NULL);
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| 95 |
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|
| 96 |
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kfree(sk->protinfo.af_netlink);
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| 97 |
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| 98 |
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atomic_dec(&netlink_sock_nr);
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| 99 |
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#ifdef NETLINK_REFCNT_DEBUG
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| 100 |
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printk(KERN_DEBUG "NETLINK %p released, %d are still alive\n", sk, atomic_read(&netlink_sock_nr));
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| 101 |
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#endif
|
| 102 |
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}
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| 103 |
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|
| 104 |
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/* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on SMP.
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| 105 |
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* Look, when several writers sleep and reader wakes them up, all but one
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| 106 |
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* immediately hit write lock and grab all the cpus. Exclusive sleep solves
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| 107 |
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* this, _but_ remember, it adds useless work on UP machines.
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| 108 |
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*/
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| 109 |
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| 110 |
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static void netlink_table_grab(void)
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| 111 |
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{
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| 112 |
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write_lock_bh(&nl_table_lock);
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| 113 |
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| 114 |
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if (atomic_read(&nl_table_users)) {
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| 115 |
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DECLARE_WAITQUEUE(wait, current);
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| 116 |
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| 117 |
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add_wait_queue_exclusive(&nl_table_wait, &wait);
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| 118 |
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for(;;) {
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| 119 |
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set_current_state(TASK_UNINTERRUPTIBLE);
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| 120 |
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if (atomic_read(&nl_table_users) == 0)
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| 121 |
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break;
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| 122 |
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write_unlock_bh(&nl_table_lock);
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| 123 |
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schedule();
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| 124 |
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write_lock_bh(&nl_table_lock);
|
| 125 |
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}
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| 126 |
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| 127 |
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__set_current_state(TASK_RUNNING);
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| 128 |
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remove_wait_queue(&nl_table_wait, &wait);
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| 129 |
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}
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| 130 |
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}
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| 131 |
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| 132 |
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static __inline__ void netlink_table_ungrab(void)
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| 133 |
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{
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| 134 |
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write_unlock_bh(&nl_table_lock);
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| 135 |
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wake_up(&nl_table_wait);
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| 136 |
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}
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| 137 |
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| 138 |
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static __inline__ void
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| 139 |
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netlink_lock_table(void)
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| 140 |
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{
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| 141 |
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/* read_lock() synchronizes us to netlink_table_grab */
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| 142 |
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| 143 |
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read_lock(&nl_table_lock);
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| 144 |
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atomic_inc(&nl_table_users);
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| 145 |
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read_unlock(&nl_table_lock);
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| 146 |
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}
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| 147 |
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| 148 |
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static __inline__ void
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| 149 |
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netlink_unlock_table(void)
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| 150 |
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{
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| 151 |
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if (atomic_dec_and_test(&nl_table_users))
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| 152 |
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wake_up(&nl_table_wait);
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| 153 |
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}
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| 154 |
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| 155 |
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static __inline__ struct sock *netlink_lookup(int protocol, u32 pid)
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| 156 |
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{
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| 157 |
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struct sock *sk;
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| 158 |
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| 159 |
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read_lock(&nl_table_lock);
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| 160 |
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for (sk=nl_table[protocol]; sk; sk=sk->next) {
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if (sk->protinfo.af_netlink->pid == pid) {
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| 162 |
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sock_hold(sk);
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| 163 |
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read_unlock(&nl_table_lock);
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| 164 |
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return sk;
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| 165 |
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}
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| 166 |
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}
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| 167 |
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| 168 |
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read_unlock(&nl_table_lock);
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| 169 |
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return NULL;
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| 170 |
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}
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| 171 |
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| 172 |
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extern struct proto_ops netlink_ops;
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| 173 |
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| 174 |
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static int netlink_insert(struct sock *sk, u32 pid)
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| 175 |
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{
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| 176 |
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int err = -EADDRINUSE;
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| 177 |
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struct sock *osk;
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| 178 |
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| 179 |
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netlink_table_grab();
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| 180 |
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for (osk=nl_table[sk->protocol]; osk; osk=osk->next) {
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| 181 |
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if (osk->protinfo.af_netlink->pid == pid)
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| 182 |
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break;
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| 183 |
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}
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| 184 |
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if (osk == NULL) {
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| 185 |
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err = -EBUSY;
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| 186 |
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if (sk->protinfo.af_netlink->pid == 0) {
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| 187 |
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sk->protinfo.af_netlink->pid = pid;
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| 188 |
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sk->next = nl_table[sk->protocol];
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| 189 |
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nl_table[sk->protocol] = sk;
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| 190 |
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sock_hold(sk);
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| 191 |
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err = 0;
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| 192 |
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}
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| 193 |
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}
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| 194 |
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netlink_table_ungrab();
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| 195 |
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return err;
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| 196 |
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}
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| 197 |
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| 198 |
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static void netlink_remove(struct sock *sk)
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| 199 |
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{
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| 200 |
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struct sock **skp;
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| 201 |
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| 202 |
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netlink_table_grab();
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| 203 |
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for (skp = &nl_table[sk->protocol]; *skp; skp = &((*skp)->next)) {
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| 204 |
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if (*skp == sk) {
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| 205 |
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*skp = sk->next;
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| 206 |
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__sock_put(sk);
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| 207 |
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break;
|
| 208 |
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}
|
| 209 |
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}
|
| 210 |
|
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netlink_table_ungrab();
|
| 211 |
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}
|
| 212 |
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|
| 213 |
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static int netlink_create(struct socket *sock, int protocol)
|
| 214 |
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{
|
| 215 |
|
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struct sock *sk;
|
| 216 |
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|
| 217 |
|
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sock->state = SS_UNCONNECTED;
|
| 218 |
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|
|
| 219 |
|
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if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
|
| 220 |
|
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return -ESOCKTNOSUPPORT;
|
| 221 |
|
|
|
| 222 |
|
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if (protocol<0 || protocol >= MAX_LINKS)
|
| 223 |
|
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return -EPROTONOSUPPORT;
|
| 224 |
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|
|
| 225 |
|
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sock->ops = &netlink_ops;
|
| 226 |
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|
| 227 |
|
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sk = sk_alloc(PF_NETLINK, GFP_KERNEL, 1);
|
| 228 |
|
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if (!sk)
|
| 229 |
|
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return -ENOMEM;
|
| 230 |
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|
| 231 |
|
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sock_init_data(sock,sk);
|
| 232 |
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|
| 233 |
|
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sk->protinfo.af_netlink = kmalloc(sizeof(struct netlink_opt), GFP_KERNEL);
|
| 234 |
|
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if (sk->protinfo.af_netlink == NULL) {
|
| 235 |
|
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sk_free(sk);
|
| 236 |
|
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return -ENOMEM;
|
| 237 |
|
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}
|
| 238 |
|
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memset(sk->protinfo.af_netlink, 0, sizeof(struct netlink_opt));
|
| 239 |
|
|
|
| 240 |
|
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spin_lock_init(&sk->protinfo.af_netlink->cb_lock);
|
| 241 |
|
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init_waitqueue_head(&sk->protinfo.af_netlink->wait);
|
| 242 |
|
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sk->destruct = netlink_sock_destruct;
|
| 243 |
|
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atomic_inc(&netlink_sock_nr);
|
| 244 |
|
|
|
| 245 |
|
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sk->protocol=protocol;
|
| 246 |
|
|
return 0;
|
| 247 |
|
|
}
|
| 248 |
|
|
|
| 249 |
|
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static int netlink_release(struct socket *sock)
|
| 250 |
|
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{
|
| 251 |
|
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struct sock *sk = sock->sk;
|
| 252 |
|
|
|
| 253 |
|
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if (!sk)
|
| 254 |
|
|
return 0;
|
| 255 |
|
|
|
| 256 |
|
|
netlink_remove(sk);
|
| 257 |
|
|
|
| 258 |
|
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spin_lock(&sk->protinfo.af_netlink->cb_lock);
|
| 259 |
|
|
if (sk->protinfo.af_netlink->cb) {
|
| 260 |
|
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sk->protinfo.af_netlink->cb->done(sk->protinfo.af_netlink->cb);
|
| 261 |
|
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netlink_destroy_callback(sk->protinfo.af_netlink->cb);
|
| 262 |
|
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sk->protinfo.af_netlink->cb = NULL;
|
| 263 |
|
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__sock_put(sk);
|
| 264 |
|
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}
|
| 265 |
|
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
| 266 |
|
|
|
| 267 |
|
|
/* OK. Socket is unlinked, and, therefore,
|
| 268 |
|
|
no new packets will arrive */
|
| 269 |
|
|
|
| 270 |
|
|
sock_orphan(sk);
|
| 271 |
|
|
sock->sk = NULL;
|
| 272 |
|
|
wake_up_interruptible_all(&sk->protinfo.af_netlink->wait);
|
| 273 |
|
|
|
| 274 |
|
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skb_queue_purge(&sk->write_queue);
|
| 275 |
|
|
|
| 276 |
|
|
if (sk->protinfo.af_netlink->pid && !sk->protinfo.af_netlink->groups) {
|
| 277 |
|
|
struct netlink_notify n = { protocol:sk->protocol,
|
| 278 |
|
|
pid:sk->protinfo.af_netlink->pid };
|
| 279 |
|
|
notifier_call_chain(&netlink_chain, NETLINK_URELEASE, &n);
|
| 280 |
|
|
}
|
| 281 |
|
|
|
| 282 |
|
|
sock_put(sk);
|
| 283 |
|
|
return 0;
|
| 284 |
|
|
}
|
| 285 |
|
|
|
| 286 |
|
|
static int netlink_autobind(struct socket *sock)
|
| 287 |
|
|
{
|
| 288 |
|
|
struct sock *sk = sock->sk;
|
| 289 |
|
|
struct sock *osk;
|
| 290 |
|
|
s32 pid = current->pid;
|
| 291 |
|
|
int err;
|
| 292 |
|
|
|
| 293 |
|
|
retry:
|
| 294 |
|
|
netlink_table_grab();
|
| 295 |
|
|
for (osk=nl_table[sk->protocol]; osk; osk=osk->next) {
|
| 296 |
|
|
if (osk->protinfo.af_netlink->pid == pid) {
|
| 297 |
|
|
/* Bind collision, search negative pid values. */
|
| 298 |
|
|
if (pid > 0)
|
| 299 |
|
|
pid = -4096;
|
| 300 |
|
|
pid--;
|
| 301 |
|
|
netlink_table_ungrab();
|
| 302 |
|
|
goto retry;
|
| 303 |
|
|
}
|
| 304 |
|
|
}
|
| 305 |
|
|
netlink_table_ungrab();
|
| 306 |
|
|
|
| 307 |
|
|
err = netlink_insert(sk, pid);
|
| 308 |
|
|
if (err == -EADDRINUSE)
|
| 309 |
|
|
goto retry;
|
| 310 |
|
|
sk->protinfo.af_netlink->groups = 0;
|
| 311 |
|
|
return 0;
|
| 312 |
|
|
}
|
| 313 |
|
|
|
| 314 |
|
|
static inline int netlink_capable(struct socket *sock, unsigned flag)
|
| 315 |
|
|
{
|
| 316 |
|
|
return (nl_nonroot[sock->sk->protocol] & flag) || capable(CAP_NET_ADMIN);
|
| 317 |
|
|
}
|
| 318 |
|
|
|
| 319 |
|
|
static int netlink_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
|
| 320 |
|
|
{
|
| 321 |
|
|
struct sock *sk = sock->sk;
|
| 322 |
|
|
int err;
|
| 323 |
|
|
struct sockaddr_nl *nladdr=(struct sockaddr_nl *)addr;
|
| 324 |
|
|
|
| 325 |
|
|
if (nladdr->nl_family != AF_NETLINK)
|
| 326 |
|
|
return -EINVAL;
|
| 327 |
|
|
|
| 328 |
|
|
/* Only superuser is allowed to listen multicasts */
|
| 329 |
|
|
if (nladdr->nl_groups && !netlink_capable(sock, NL_NONROOT_RECV))
|
| 330 |
|
|
return -EPERM;
|
| 331 |
|
|
|
| 332 |
|
|
if (sk->protinfo.af_netlink->pid) {
|
| 333 |
|
|
if (nladdr->nl_pid != sk->protinfo.af_netlink->pid)
|
| 334 |
|
|
return -EINVAL;
|
| 335 |
|
|
sk->protinfo.af_netlink->groups = nladdr->nl_groups;
|
| 336 |
|
|
return 0;
|
| 337 |
|
|
}
|
| 338 |
|
|
|
| 339 |
|
|
if (nladdr->nl_pid == 0) {
|
| 340 |
|
|
err = netlink_autobind(sock);
|
| 341 |
|
|
if (err == 0)
|
| 342 |
|
|
sk->protinfo.af_netlink->groups = nladdr->nl_groups;
|
| 343 |
|
|
return err;
|
| 344 |
|
|
}
|
| 345 |
|
|
|
| 346 |
|
|
err = netlink_insert(sk, nladdr->nl_pid);
|
| 347 |
|
|
if (err == 0)
|
| 348 |
|
|
sk->protinfo.af_netlink->groups = nladdr->nl_groups;
|
| 349 |
|
|
return err;
|
| 350 |
|
|
}
|
| 351 |
|
|
|
| 352 |
|
|
static int netlink_connect(struct socket *sock, struct sockaddr *addr,
|
| 353 |
|
|
int alen, int flags)
|
| 354 |
|
|
{
|
| 355 |
|
|
int err = 0;
|
| 356 |
|
|
struct sock *sk = sock->sk;
|
| 357 |
|
|
struct sockaddr_nl *nladdr=(struct sockaddr_nl*)addr;
|
| 358 |
|
|
|
| 359 |
|
|
if (addr->sa_family == AF_UNSPEC) {
|
| 360 |
|
|
sk->protinfo.af_netlink->dst_pid = 0;
|
| 361 |
|
|
sk->protinfo.af_netlink->dst_groups = 0;
|
| 362 |
|
|
return 0;
|
| 363 |
|
|
}
|
| 364 |
|
|
if (addr->sa_family != AF_NETLINK)
|
| 365 |
|
|
return -EINVAL;
|
| 366 |
|
|
|
| 367 |
|
|
/* Only superuser is allowed to send multicasts */
|
| 368 |
|
|
if (nladdr->nl_groups && !netlink_capable(sock, NL_NONROOT_SEND))
|
| 369 |
|
|
return -EPERM;
|
| 370 |
|
|
|
| 371 |
|
|
if (!sk->protinfo.af_netlink->pid)
|
| 372 |
|
|
err = netlink_autobind(sock);
|
| 373 |
|
|
|
| 374 |
|
|
if (err == 0) {
|
| 375 |
|
|
sk->protinfo.af_netlink->dst_pid = nladdr->nl_pid;
|
| 376 |
|
|
sk->protinfo.af_netlink->dst_groups = nladdr->nl_groups;
|
| 377 |
|
|
}
|
| 378 |
|
|
|
| 379 |
|
|
return 0;
|
| 380 |
|
|
}
|
| 381 |
|
|
|
| 382 |
|
|
static int netlink_getname(struct socket *sock, struct sockaddr *addr, int *addr_len, int peer)
|
| 383 |
|
|
{
|
| 384 |
|
|
struct sock *sk = sock->sk;
|
| 385 |
|
|
struct sockaddr_nl *nladdr=(struct sockaddr_nl *)addr;
|
| 386 |
|
|
|
| 387 |
|
|
nladdr->nl_family = AF_NETLINK;
|
| 388 |
|
|
nladdr->nl_pad = 0;
|
| 389 |
|
|
*addr_len = sizeof(*nladdr);
|
| 390 |
|
|
|
| 391 |
|
|
if (peer) {
|
| 392 |
|
|
nladdr->nl_pid = sk->protinfo.af_netlink->dst_pid;
|
| 393 |
|
|
nladdr->nl_groups = sk->protinfo.af_netlink->dst_groups;
|
| 394 |
|
|
} else {
|
| 395 |
|
|
nladdr->nl_pid = sk->protinfo.af_netlink->pid;
|
| 396 |
|
|
nladdr->nl_groups = sk->protinfo.af_netlink->groups;
|
| 397 |
|
|
}
|
| 398 |
|
|
return 0;
|
| 399 |
|
|
}
|
| 400 |
|
|
|
| 401 |
|
|
static void netlink_overrun(struct sock *sk)
|
| 402 |
|
|
{
|
| 403 |
|
|
if (!test_and_set_bit(0, &sk->protinfo.af_netlink->state)) {
|
| 404 |
|
|
sk->err = ENOBUFS;
|
| 405 |
|
|
sk->error_report(sk);
|
| 406 |
|
|
}
|
| 407 |
|
|
}
|
| 408 |
|
|
|
| 409 |
|
|
int netlink_unicast(struct sock *ssk, struct sk_buff *skb, u32 pid, int nonblock)
|
| 410 |
|
|
{
|
| 411 |
|
|
struct sock *sk;
|
| 412 |
|
|
int len = skb->len;
|
| 413 |
|
|
int protocol = ssk->protocol;
|
| 414 |
|
|
long timeo;
|
| 415 |
|
|
DECLARE_WAITQUEUE(wait, current);
|
| 416 |
|
|
|
| 417 |
|
|
timeo = sock_sndtimeo(ssk, nonblock);
|
| 418 |
|
|
|
| 419 |
|
|
retry:
|
| 420 |
|
|
sk = netlink_lookup(protocol, pid);
|
| 421 |
|
|
if (sk == NULL)
|
| 422 |
|
|
goto no_dst;
|
| 423 |
|
|
|
| 424 |
|
|
/* Don't bother queuing skb if kernel socket has no input function */
|
| 425 |
|
|
if (sk->protinfo.af_netlink->pid == 0 &&
|
| 426 |
|
|
!sk->protinfo.af_netlink->data_ready)
|
| 427 |
|
|
goto no_dst;
|
| 428 |
|
|
|
| 429 |
|
|
#ifdef NL_EMULATE_DEV
|
| 430 |
|
|
if (sk->protinfo.af_netlink->handler) {
|
| 431 |
|
|
skb_orphan(skb);
|
| 432 |
|
|
len = sk->protinfo.af_netlink->handler(protocol, skb);
|
| 433 |
|
|
sock_put(sk);
|
| 434 |
|
|
return len;
|
| 435 |
|
|
}
|
| 436 |
|
|
#endif
|
| 437 |
|
|
|
| 438 |
|
|
if (atomic_read(&sk->rmem_alloc) > sk->rcvbuf ||
|
| 439 |
|
|
test_bit(0, &sk->protinfo.af_netlink->state)) {
|
| 440 |
|
|
if (!timeo) {
|
| 441 |
|
|
if (ssk->protinfo.af_netlink->pid == 0)
|
| 442 |
|
|
netlink_overrun(sk);
|
| 443 |
|
|
sock_put(sk);
|
| 444 |
|
|
kfree_skb(skb);
|
| 445 |
|
|
return -EAGAIN;
|
| 446 |
|
|
}
|
| 447 |
|
|
|
| 448 |
|
|
__set_current_state(TASK_INTERRUPTIBLE);
|
| 449 |
|
|
add_wait_queue(&sk->protinfo.af_netlink->wait, &wait);
|
| 450 |
|
|
|
| 451 |
|
|
if ((atomic_read(&sk->rmem_alloc) > sk->rcvbuf ||
|
| 452 |
|
|
test_bit(0, &sk->protinfo.af_netlink->state)) &&
|
| 453 |
|
|
!sk->dead)
|
| 454 |
|
|
timeo = schedule_timeout(timeo);
|
| 455 |
|
|
|
| 456 |
|
|
__set_current_state(TASK_RUNNING);
|
| 457 |
|
|
remove_wait_queue(&sk->protinfo.af_netlink->wait, &wait);
|
| 458 |
|
|
sock_put(sk);
|
| 459 |
|
|
|
| 460 |
|
|
if (signal_pending(current)) {
|
| 461 |
|
|
kfree_skb(skb);
|
| 462 |
|
|
return sock_intr_errno(timeo);
|
| 463 |
|
|
}
|
| 464 |
|
|
goto retry;
|
| 465 |
|
|
}
|
| 466 |
|
|
|
| 467 |
|
|
skb_orphan(skb);
|
| 468 |
|
|
skb_set_owner_r(skb, sk);
|
| 469 |
|
|
skb_queue_tail(&sk->receive_queue, skb);
|
| 470 |
|
|
sk->data_ready(sk, len);
|
| 471 |
|
|
sock_put(sk);
|
| 472 |
|
|
return len;
|
| 473 |
|
|
|
| 474 |
|
|
no_dst:
|
| 475 |
|
|
kfree_skb(skb);
|
| 476 |
|
|
return -ECONNREFUSED;
|
| 477 |
|
|
}
|
| 478 |
|
|
|
| 479 |
|
|
static __inline__ int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb)
|
| 480 |
|
|
{
|
| 481 |
|
|
#ifdef NL_EMULATE_DEV
|
| 482 |
|
|
if (sk->protinfo.af_netlink->handler) {
|
| 483 |
|
|
skb_orphan(skb);
|
| 484 |
|
|
sk->protinfo.af_netlink->handler(sk->protocol, skb);
|
| 485 |
|
|
return 0;
|
| 486 |
|
|
} else
|
| 487 |
|
|
#endif
|
| 488 |
|
|
if (atomic_read(&sk->rmem_alloc) <= sk->rcvbuf &&
|
| 489 |
|
|
!test_bit(0, &sk->protinfo.af_netlink->state)) {
|
| 490 |
|
|
skb_orphan(skb);
|
| 491 |
|
|
skb_set_owner_r(skb, sk);
|
| 492 |
|
|
skb_queue_tail(&sk->receive_queue, skb);
|
| 493 |
|
|
sk->data_ready(sk, skb->len);
|
| 494 |
|
|
return 0;
|
| 495 |
|
|
}
|
| 496 |
|
|
return -1;
|
| 497 |
|
|
}
|
| 498 |
|
|
|
| 499 |
|
|
void netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 pid,
|
| 500 |
|
|
u32 group, int allocation)
|
| 501 |
|
|
{
|
| 502 |
|
|
struct sock *sk;
|
| 503 |
|
|
struct sk_buff *skb2 = NULL;
|
| 504 |
|
|
int protocol = ssk->protocol;
|
| 505 |
|
|
int failure = 0;
|
| 506 |
|
|
|
| 507 |
|
|
/* While we sleep in clone, do not allow to change socket list */
|
| 508 |
|
|
|
| 509 |
|
|
netlink_lock_table();
|
| 510 |
|
|
|
| 511 |
|
|
for (sk = nl_table[protocol]; sk; sk = sk->next) {
|
| 512 |
|
|
if (ssk == sk)
|
| 513 |
|
|
continue;
|
| 514 |
|
|
|
| 515 |
|
|
if (sk->protinfo.af_netlink->pid == pid ||
|
| 516 |
|
|
!(sk->protinfo.af_netlink->groups&group))
|
| 517 |
|
|
continue;
|
| 518 |
|
|
|
| 519 |
|
|
if (failure) {
|
| 520 |
|
|
netlink_overrun(sk);
|
| 521 |
|
|
continue;
|
| 522 |
|
|
}
|
| 523 |
|
|
|
| 524 |
|
|
sock_hold(sk);
|
| 525 |
|
|
if (skb2 == NULL) {
|
| 526 |
|
|
if (atomic_read(&skb->users) != 1) {
|
| 527 |
|
|
skb2 = skb_clone(skb, allocation);
|
| 528 |
|
|
} else {
|
| 529 |
|
|
skb2 = skb;
|
| 530 |
|
|
atomic_inc(&skb->users);
|
| 531 |
|
|
}
|
| 532 |
|
|
}
|
| 533 |
|
|
if (skb2 == NULL) {
|
| 534 |
|
|
netlink_overrun(sk);
|
| 535 |
|
|
/* Clone failed. Notify ALL listeners. */
|
| 536 |
|
|
failure = 1;
|
| 537 |
|
|
} else if (netlink_broadcast_deliver(sk, skb2)) {
|
| 538 |
|
|
netlink_overrun(sk);
|
| 539 |
|
|
} else
|
| 540 |
|
|
skb2 = NULL;
|
| 541 |
|
|
sock_put(sk);
|
| 542 |
|
|
}
|
| 543 |
|
|
|
| 544 |
|
|
netlink_unlock_table();
|
| 545 |
|
|
|
| 546 |
|
|
if (skb2)
|
| 547 |
|
|
kfree_skb(skb2);
|
| 548 |
|
|
kfree_skb(skb);
|
| 549 |
|
|
}
|
| 550 |
|
|
|
| 551 |
|
|
void netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code)
|
| 552 |
|
|
{
|
| 553 |
|
|
struct sock *sk;
|
| 554 |
|
|
int protocol = ssk->protocol;
|
| 555 |
|
|
|
| 556 |
|
|
read_lock(&nl_table_lock);
|
| 557 |
|
|
for (sk = nl_table[protocol]; sk; sk = sk->next) {
|
| 558 |
|
|
if (ssk == sk)
|
| 559 |
|
|
continue;
|
| 560 |
|
|
|
| 561 |
|
|
if (sk->protinfo.af_netlink->pid == pid ||
|
| 562 |
|
|
!(sk->protinfo.af_netlink->groups&group))
|
| 563 |
|
|
continue;
|
| 564 |
|
|
|
| 565 |
|
|
sk->err = code;
|
| 566 |
|
|
sk->error_report(sk);
|
| 567 |
|
|
}
|
| 568 |
|
|
read_unlock(&nl_table_lock);
|
| 569 |
|
|
}
|
| 570 |
|
|
|
| 571 |
|
|
static inline void netlink_rcv_wake(struct sock *sk)
|
| 572 |
|
|
{
|
| 573 |
|
|
if (skb_queue_len(&sk->receive_queue) == 0)
|
| 574 |
|
|
clear_bit(0, &sk->protinfo.af_netlink->state);
|
| 575 |
|
|
if (!test_bit(0, &sk->protinfo.af_netlink->state))
|
| 576 |
|
|
wake_up_interruptible(&sk->protinfo.af_netlink->wait);
|
| 577 |
|
|
}
|
| 578 |
|
|
|
| 579 |
|
|
static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, int len,
|
| 580 |
|
|
struct scm_cookie *scm)
|
| 581 |
|
|
{
|
| 582 |
|
|
struct sock *sk = sock->sk;
|
| 583 |
|
|
struct sockaddr_nl *addr=msg->msg_name;
|
| 584 |
|
|
u32 dst_pid;
|
| 585 |
|
|
u32 dst_groups;
|
| 586 |
|
|
struct sk_buff *skb;
|
| 587 |
|
|
int err;
|
| 588 |
|
|
|
| 589 |
|
|
if (msg->msg_flags&MSG_OOB)
|
| 590 |
|
|
return -EOPNOTSUPP;
|
| 591 |
|
|
|
| 592 |
|
|
if (msg->msg_namelen) {
|
| 593 |
|
|
if (addr->nl_family != AF_NETLINK)
|
| 594 |
|
|
return -EINVAL;
|
| 595 |
|
|
dst_pid = addr->nl_pid;
|
| 596 |
|
|
dst_groups = addr->nl_groups;
|
| 597 |
|
|
if (dst_groups && !netlink_capable(sock, NL_NONROOT_SEND))
|
| 598 |
|
|
return -EPERM;
|
| 599 |
|
|
} else {
|
| 600 |
|
|
dst_pid = sk->protinfo.af_netlink->dst_pid;
|
| 601 |
|
|
dst_groups = sk->protinfo.af_netlink->dst_groups;
|
| 602 |
|
|
}
|
| 603 |
|
|
|
| 604 |
|
|
if (!sk->protinfo.af_netlink->pid) {
|
| 605 |
|
|
err = netlink_autobind(sock);
|
| 606 |
|
|
if (err)
|
| 607 |
|
|
goto out;
|
| 608 |
|
|
}
|
| 609 |
|
|
|
| 610 |
|
|
err = -EMSGSIZE;
|
| 611 |
|
|
if ((unsigned)len > sk->sndbuf-32)
|
| 612 |
|
|
goto out;
|
| 613 |
|
|
err = -ENOBUFS;
|
| 614 |
|
|
skb = alloc_skb(len, GFP_KERNEL);
|
| 615 |
|
|
if (skb==NULL)
|
| 616 |
|
|
goto out;
|
| 617 |
|
|
|
| 618 |
|
|
NETLINK_CB(skb).pid = sk->protinfo.af_netlink->pid;
|
| 619 |
|
|
NETLINK_CB(skb).groups = sk->protinfo.af_netlink->groups;
|
| 620 |
|
|
NETLINK_CB(skb).dst_pid = dst_pid;
|
| 621 |
|
|
NETLINK_CB(skb).dst_groups = dst_groups;
|
| 622 |
|
|
memcpy(NETLINK_CREDS(skb), &scm->creds, sizeof(struct ucred));
|
| 623 |
|
|
|
| 624 |
|
|
/* What can I do? Netlink is asynchronous, so that
|
| 625 |
|
|
we will have to save current capabilities to
|
| 626 |
|
|
check them, when this message will be delivered
|
| 627 |
|
|
to corresponding kernel module. --ANK (980802)
|
| 628 |
|
|
*/
|
| 629 |
|
|
NETLINK_CB(skb).eff_cap = current->cap_effective;
|
| 630 |
|
|
|
| 631 |
|
|
err = -EFAULT;
|
| 632 |
|
|
if (memcpy_fromiovec(skb_put(skb,len), msg->msg_iov, len)) {
|
| 633 |
|
|
kfree_skb(skb);
|
| 634 |
|
|
goto out;
|
| 635 |
|
|
}
|
| 636 |
|
|
|
| 637 |
|
|
if (dst_groups) {
|
| 638 |
|
|
atomic_inc(&skb->users);
|
| 639 |
|
|
netlink_broadcast(sk, skb, dst_pid, dst_groups, GFP_KERNEL);
|
| 640 |
|
|
}
|
| 641 |
|
|
err = netlink_unicast(sk, skb, dst_pid, msg->msg_flags&MSG_DONTWAIT);
|
| 642 |
|
|
|
| 643 |
|
|
out:
|
| 644 |
|
|
return err;
|
| 645 |
|
|
}
|
| 646 |
|
|
|
| 647 |
|
|
static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, int len,
|
| 648 |
|
|
int flags, struct scm_cookie *scm)
|
| 649 |
|
|
{
|
| 650 |
|
|
struct sock *sk = sock->sk;
|
| 651 |
|
|
int noblock = flags&MSG_DONTWAIT;
|
| 652 |
|
|
int copied;
|
| 653 |
|
|
struct sk_buff *skb;
|
| 654 |
|
|
int err;
|
| 655 |
|
|
|
| 656 |
|
|
if (flags&MSG_OOB)
|
| 657 |
|
|
return -EOPNOTSUPP;
|
| 658 |
|
|
|
| 659 |
|
|
copied = 0;
|
| 660 |
|
|
|
| 661 |
|
|
skb = skb_recv_datagram(sk,flags,noblock,&err);
|
| 662 |
|
|
if (skb==NULL)
|
| 663 |
|
|
goto out;
|
| 664 |
|
|
|
| 665 |
|
|
msg->msg_namelen = 0;
|
| 666 |
|
|
|
| 667 |
|
|
copied = skb->len;
|
| 668 |
|
|
if (len < copied) {
|
| 669 |
|
|
msg->msg_flags |= MSG_TRUNC;
|
| 670 |
|
|
copied = len;
|
| 671 |
|
|
}
|
| 672 |
|
|
|
| 673 |
|
|
skb->h.raw = skb->data;
|
| 674 |
|
|
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
|
| 675 |
|
|
|
| 676 |
|
|
if (msg->msg_name) {
|
| 677 |
|
|
struct sockaddr_nl *addr = (struct sockaddr_nl*)msg->msg_name;
|
| 678 |
|
|
addr->nl_family = AF_NETLINK;
|
| 679 |
|
|
addr->nl_pad = 0;
|
| 680 |
|
|
addr->nl_pid = NETLINK_CB(skb).pid;
|
| 681 |
|
|
addr->nl_groups = NETLINK_CB(skb).dst_groups;
|
| 682 |
|
|
msg->msg_namelen = sizeof(*addr);
|
| 683 |
|
|
}
|
| 684 |
|
|
|
| 685 |
|
|
scm->creds = *NETLINK_CREDS(skb);
|
| 686 |
|
|
skb_free_datagram(sk, skb);
|
| 687 |
|
|
|
| 688 |
|
|
if (sk->protinfo.af_netlink->cb
|
| 689 |
|
|
&& atomic_read(&sk->rmem_alloc) <= sk->rcvbuf/2)
|
| 690 |
|
|
netlink_dump(sk);
|
| 691 |
|
|
|
| 692 |
|
|
out:
|
| 693 |
|
|
netlink_rcv_wake(sk);
|
| 694 |
|
|
return err ? : copied;
|
| 695 |
|
|
}
|
| 696 |
|
|
|
| 697 |
|
|
void netlink_data_ready(struct sock *sk, int len)
|
| 698 |
|
|
{
|
| 699 |
|
|
if (sk->protinfo.af_netlink->data_ready)
|
| 700 |
|
|
sk->protinfo.af_netlink->data_ready(sk, len);
|
| 701 |
|
|
netlink_rcv_wake(sk);
|
| 702 |
|
|
}
|
| 703 |
|
|
|
| 704 |
|
|
/*
|
| 705 |
|
|
* We export these functions to other modules. They provide a
|
| 706 |
|
|
* complete set of kernel non-blocking support for message
|
| 707 |
|
|
* queueing.
|
| 708 |
|
|
*/
|
| 709 |
|
|
|
| 710 |
|
|
struct sock *
|
| 711 |
|
|
netlink_kernel_create(int unit, void (*input)(struct sock *sk, int len))
|
| 712 |
|
|
{
|
| 713 |
|
|
struct socket *sock;
|
| 714 |
|
|
struct sock *sk;
|
| 715 |
|
|
|
| 716 |
|
|
if (unit<0 || unit>=MAX_LINKS)
|
| 717 |
|
|
return NULL;
|
| 718 |
|
|
|
| 719 |
|
|
if (!(sock = sock_alloc()))
|
| 720 |
|
|
return NULL;
|
| 721 |
|
|
|
| 722 |
|
|
sock->type = SOCK_RAW;
|
| 723 |
|
|
|
| 724 |
|
|
if (netlink_create(sock, unit) < 0) {
|
| 725 |
|
|
sock_release(sock);
|
| 726 |
|
|
return NULL;
|
| 727 |
|
|
}
|
| 728 |
|
|
sk = sock->sk;
|
| 729 |
|
|
sk->data_ready = netlink_data_ready;
|
| 730 |
|
|
if (input)
|
| 731 |
|
|
sk->protinfo.af_netlink->data_ready = input;
|
| 732 |
|
|
|
| 733 |
|
|
netlink_insert(sk, 0);
|
| 734 |
|
|
return sk;
|
| 735 |
|
|
}
|
| 736 |
|
|
|
| 737 |
|
|
void netlink_set_nonroot(int protocol, unsigned flags)
|
| 738 |
|
|
{
|
| 739 |
|
|
if ((unsigned)protocol < MAX_LINKS)
|
| 740 |
|
|
nl_nonroot[protocol] = flags;
|
| 741 |
|
|
}
|
| 742 |
|
|
|
| 743 |
|
|
static void netlink_destroy_callback(struct netlink_callback *cb)
|
| 744 |
|
|
{
|
| 745 |
|
|
if (cb->skb)
|
| 746 |
|
|
kfree_skb(cb->skb);
|
| 747 |
|
|
kfree(cb);
|
| 748 |
|
|
}
|
| 749 |
|
|
|
| 750 |
|
|
/*
|
| 751 |
|
|
* It looks a bit ugly.
|
| 752 |
|
|
* It would be better to create kernel thread.
|
| 753 |
|
|
*/
|
| 754 |
|
|
|
| 755 |
|
|
static int netlink_dump(struct sock *sk)
|
| 756 |
|
|
{
|
| 757 |
|
|
struct netlink_callback *cb;
|
| 758 |
|
|
struct sk_buff *skb;
|
| 759 |
|
|
struct nlmsghdr *nlh;
|
| 760 |
|
|
int len;
|
| 761 |
|
|
|
| 762 |
|
|
skb = sock_rmalloc(sk, NLMSG_GOODSIZE, 0, GFP_KERNEL);
|
| 763 |
|
|
if (!skb)
|
| 764 |
|
|
return -ENOBUFS;
|
| 765 |
|
|
|
| 766 |
|
|
spin_lock(&sk->protinfo.af_netlink->cb_lock);
|
| 767 |
|
|
|
| 768 |
|
|
cb = sk->protinfo.af_netlink->cb;
|
| 769 |
|
|
if (cb == NULL) {
|
| 770 |
|
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
| 771 |
|
|
kfree_skb(skb);
|
| 772 |
|
|
return -EINVAL;
|
| 773 |
|
|
}
|
| 774 |
|
|
|
| 775 |
|
|
len = cb->dump(skb, cb);
|
| 776 |
|
|
|
| 777 |
|
|
if (len > 0) {
|
| 778 |
|
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
| 779 |
|
|
skb_queue_tail(&sk->receive_queue, skb);
|
| 780 |
|
|
sk->data_ready(sk, len);
|
| 781 |
|
|
return 0;
|
| 782 |
|
|
}
|
| 783 |
|
|
|
| 784 |
|
|
nlh = __nlmsg_put(skb, NETLINK_CB(cb->skb).pid, cb->nlh->nlmsg_seq, NLMSG_DONE, sizeof(int));
|
| 785 |
|
|
nlh->nlmsg_flags |= NLM_F_MULTI;
|
| 786 |
|
|
memcpy(NLMSG_DATA(nlh), &len, sizeof(len));
|
| 787 |
|
|
skb_queue_tail(&sk->receive_queue, skb);
|
| 788 |
|
|
sk->data_ready(sk, skb->len);
|
| 789 |
|
|
|
| 790 |
|
|
cb->done(cb);
|
| 791 |
|
|
sk->protinfo.af_netlink->cb = NULL;
|
| 792 |
|
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
| 793 |
|
|
|
| 794 |
|
|
netlink_destroy_callback(cb);
|
| 795 |
|
|
sock_put(sk);
|
| 796 |
|
|
return 0;
|
| 797 |
|
|
}
|
| 798 |
|
|
|
| 799 |
|
|
int netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
|
| 800 |
|
|
struct nlmsghdr *nlh,
|
| 801 |
|
|
int (*dump)(struct sk_buff *skb, struct netlink_callback*),
|
| 802 |
|
|
int (*done)(struct netlink_callback*))
|
| 803 |
|
|
{
|
| 804 |
|
|
struct netlink_callback *cb;
|
| 805 |
|
|
struct sock *sk;
|
| 806 |
|
|
|
| 807 |
|
|
cb = kmalloc(sizeof(*cb), GFP_KERNEL);
|
| 808 |
|
|
if (cb == NULL)
|
| 809 |
|
|
return -ENOBUFS;
|
| 810 |
|
|
|
| 811 |
|
|
memset(cb, 0, sizeof(*cb));
|
| 812 |
|
|
cb->dump = dump;
|
| 813 |
|
|
cb->done = done;
|
| 814 |
|
|
cb->nlh = nlh;
|
| 815 |
|
|
atomic_inc(&skb->users);
|
| 816 |
|
|
cb->skb = skb;
|
| 817 |
|
|
|
| 818 |
|
|
sk = netlink_lookup(ssk->protocol, NETLINK_CB(skb).pid);
|
| 819 |
|
|
if (sk == NULL) {
|
| 820 |
|
|
netlink_destroy_callback(cb);
|
| 821 |
|
|
return -ECONNREFUSED;
|
| 822 |
|
|
}
|
| 823 |
|
|
/* A dump is in progress... */
|
| 824 |
|
|
spin_lock(&sk->protinfo.af_netlink->cb_lock);
|
| 825 |
|
|
if (sk->protinfo.af_netlink->cb) {
|
| 826 |
|
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
| 827 |
|
|
netlink_destroy_callback(cb);
|
| 828 |
|
|
sock_put(sk);
|
| 829 |
|
|
return -EBUSY;
|
| 830 |
|
|
}
|
| 831 |
|
|
sk->protinfo.af_netlink->cb = cb;
|
| 832 |
|
|
spin_unlock(&sk->protinfo.af_netlink->cb_lock);
|
| 833 |
|
|
|
| 834 |
|
|
netlink_dump(sk);
|
| 835 |
|
|
return 0;
|
| 836 |
|
|
}
|
| 837 |
|
|
|
| 838 |
|
|
void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
|
| 839 |
|
|
{
|
| 840 |
|
|
struct sk_buff *skb;
|
| 841 |
|
|
struct nlmsghdr *rep;
|
| 842 |
|
|
struct nlmsgerr *errmsg;
|
| 843 |
|
|
int size;
|
| 844 |
|
|
|
| 845 |
|
|
if (err == 0)
|
| 846 |
|
|
size = NLMSG_SPACE(sizeof(struct nlmsgerr));
|
| 847 |
|
|
else
|
| 848 |
|
|
size = NLMSG_SPACE(4 + NLMSG_ALIGN(nlh->nlmsg_len));
|
| 849 |
|
|
|
| 850 |
|
|
skb = alloc_skb(size, GFP_KERNEL);
|
| 851 |
|
|
if (!skb) {
|
| 852 |
|
|
struct sock *sk;
|
| 853 |
|
|
|
| 854 |
|
|
sk = netlink_lookup(in_skb->sk->protocol,
|
| 855 |
|
|
NETLINK_CB(in_skb).pid);
|
| 856 |
|
|
if (sk) {
|
| 857 |
|
|
sk->err = ENOBUFS;
|
| 858 |
|
|
sk->error_report(sk);
|
| 859 |
|
|
sock_put(sk);
|
| 860 |
|
|
}
|
| 861 |
|
|
}
|
| 862 |
|
|
|
| 863 |
|
|
rep = __nlmsg_put(skb, NETLINK_CB(in_skb).pid, nlh->nlmsg_seq,
|
| 864 |
|
|
NLMSG_ERROR, sizeof(struct nlmsgerr));
|
| 865 |
|
|
errmsg = NLMSG_DATA(rep);
|
| 866 |
|
|
errmsg->error = err;
|
| 867 |
|
|
memcpy(&errmsg->msg, nlh, err ? nlh->nlmsg_len : sizeof(struct nlmsghdr));
|
| 868 |
|
|
netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
|
| 869 |
|
|
}
|
| 870 |
|
|
|
| 871 |
|
|
|
| 872 |
|
|
#ifdef NL_EMULATE_DEV
|
| 873 |
|
|
|
| 874 |
|
|
static rwlock_t nl_emu_lock = RW_LOCK_UNLOCKED;
|
| 875 |
|
|
|
| 876 |
|
|
/*
|
| 877 |
|
|
* Backward compatibility.
|
| 878 |
|
|
*/
|
| 879 |
|
|
|
| 880 |
|
|
int netlink_attach(int unit, int (*function)(int, struct sk_buff *skb))
|
| 881 |
|
|
{
|
| 882 |
|
|
struct sock *sk = netlink_kernel_create(unit, NULL);
|
| 883 |
|
|
if (sk == NULL)
|
| 884 |
|
|
return -ENOBUFS;
|
| 885 |
|
|
sk->protinfo.af_netlink->handler = function;
|
| 886 |
|
|
write_lock_bh(&nl_emu_lock);
|
| 887 |
|
|
netlink_kernel[unit] = sk->socket;
|
| 888 |
|
|
write_unlock_bh(&nl_emu_lock);
|
| 889 |
|
|
return 0;
|
| 890 |
|
|
}
|
| 891 |
|
|
|
| 892 |
|
|
void netlink_detach(int unit)
|
| 893 |
|
|
{
|
| 894 |
|
|
struct socket *sock;
|
| 895 |
|
|
|
| 896 |
|
|
write_lock_bh(&nl_emu_lock);
|
| 897 |
|
|
sock = netlink_kernel[unit];
|
| 898 |
|
|
netlink_kernel[unit] = NULL;
|
| 899 |
|
|
write_unlock_bh(&nl_emu_lock);
|
| 900 |
|
|
|
| 901 |
|
|
sock_release(sock);
|
| 902 |
|
|
}
|
| 903 |
|
|
|
| 904 |
|
|
int netlink_post(int unit, struct sk_buff *skb)
|
| 905 |
|
|
{
|
| 906 |
|
|
struct socket *sock;
|
| 907 |
|
|
|
| 908 |
|
|
read_lock(&nl_emu_lock);
|
| 909 |
|
|
sock = netlink_kernel[unit];
|
| 910 |
|
|
if (sock) {
|
| 911 |
|
|
struct sock *sk = sock->sk;
|
| 912 |
|
|
memset(skb->cb, 0, sizeof(skb->cb));
|
| 913 |
|
|
sock_hold(sk);
|
| 914 |
|
|
read_unlock(&nl_emu_lock);
|
| 915 |
|
|
|
| 916 |
|
|
netlink_broadcast(sk, skb, 0, ~0, GFP_ATOMIC);
|
| 917 |
|
|
|
| 918 |
|
|
sock_put(sk);
|
| 919 |
|
|
return 0;
|
| 920 |
|
|
}
|
| 921 |
|
|
read_unlock(&nl_emu_lock);
|
| 922 |
|
|
return -EUNATCH;
|
| 923 |
|
|
}
|
| 924 |
|
|
|
| 925 |
|
|
#endif
|
| 926 |
|
|
|
| 927 |
|
|
|
| 928 |
|
|
#ifdef CONFIG_PROC_FS
|
| 929 |
|
|
static int netlink_read_proc(char *buffer, char **start, off_t offset,
|
| 930 |
|
|
int length, int *eof, void *data)
|
| 931 |
|
|
{
|
| 932 |
|
|
off_t pos=0;
|
| 933 |
|
|
off_t begin=0;
|
| 934 |
|
|
int len=0;
|
| 935 |
|
|
int i;
|
| 936 |
|
|
struct sock *s;
|
| 937 |
|
|
|
| 938 |
|
|
len+= sprintf(buffer,"sk Eth Pid Groups "
|
| 939 |
|
|
"Rmem Wmem Dump Locks\n");
|
| 940 |
|
|
|
| 941 |
|
|
for (i=0; i<MAX_LINKS; i++) {
|
| 942 |
|
|
read_lock(&nl_table_lock);
|
| 943 |
|
|
for (s = nl_table[i]; s; s = s->next) {
|
| 944 |
|
|
len+=sprintf(buffer+len,"%p %-3d %-6d %08x %-8d %-8d %p %d",
|
| 945 |
|
|
s,
|
| 946 |
|
|
s->protocol,
|
| 947 |
|
|
s->protinfo.af_netlink->pid,
|
| 948 |
|
|
s->protinfo.af_netlink->groups,
|
| 949 |
|
|
atomic_read(&s->rmem_alloc),
|
| 950 |
|
|
atomic_read(&s->wmem_alloc),
|
| 951 |
|
|
s->protinfo.af_netlink->cb,
|
| 952 |
|
|
atomic_read(&s->refcnt)
|
| 953 |
|
|
);
|
| 954 |
|
|
|
| 955 |
|
|
buffer[len++]='\n';
|
| 956 |
|
|
|
| 957 |
|
|
pos=begin+len;
|
| 958 |
|
|
if(pos<offset) {
|
| 959 |
|
|
len=0;
|
| 960 |
|
|
begin=pos;
|
| 961 |
|
|
}
|
| 962 |
|
|
if(pos>offset+length) {
|
| 963 |
|
|
read_unlock(&nl_table_lock);
|
| 964 |
|
|
goto done;
|
| 965 |
|
|
}
|
| 966 |
|
|
}
|
| 967 |
|
|
read_unlock(&nl_table_lock);
|
| 968 |
|
|
}
|
| 969 |
|
|
*eof = 1;
|
| 970 |
|
|
|
| 971 |
|
|
done:
|
| 972 |
|
|
*start=buffer+(offset-begin);
|
| 973 |
|
|
len-=(offset-begin);
|
| 974 |
|
|
if(len>length)
|
| 975 |
|
|
len=length;
|
| 976 |
|
|
if(len<0)
|
| 977 |
|
|
len=0;
|
| 978 |
|
|
return len;
|
| 979 |
|
|
}
|
| 980 |
|
|
#endif
|
| 981 |
|
|
|
| 982 |
|
|
int netlink_register_notifier(struct notifier_block *nb)
|
| 983 |
|
|
{
|
| 984 |
|
|
return notifier_chain_register(&netlink_chain, nb);
|
| 985 |
|
|
}
|
| 986 |
|
|
|
| 987 |
|
|
int netlink_unregister_notifier(struct notifier_block *nb)
|
| 988 |
|
|
{
|
| 989 |
|
|
return notifier_chain_unregister(&netlink_chain, nb);
|
| 990 |
|
|
}
|
| 991 |
|
|
|
| 992 |
|
|
struct proto_ops netlink_ops = {
|
| 993 |
|
|
family: PF_NETLINK,
|
| 994 |
|
|
|
| 995 |
|
|
release: netlink_release,
|
| 996 |
|
|
bind: netlink_bind,
|
| 997 |
|
|
connect: netlink_connect,
|
| 998 |
|
|
socketpair: sock_no_socketpair,
|
| 999 |
|
|
accept: sock_no_accept,
|
| 1000 |
|
|
getname: netlink_getname,
|
| 1001 |
|
|
poll: datagram_poll,
|
| 1002 |
|
|
ioctl: sock_no_ioctl,
|
| 1003 |
|
|
listen: sock_no_listen,
|
| 1004 |
|
|
shutdown: sock_no_shutdown,
|
| 1005 |
|
|
setsockopt: sock_no_setsockopt,
|
| 1006 |
|
|
getsockopt: sock_no_getsockopt,
|
| 1007 |
|
|
sendmsg: netlink_sendmsg,
|
| 1008 |
|
|
recvmsg: netlink_recvmsg,
|
| 1009 |
|
|
mmap: sock_no_mmap,
|
| 1010 |
|
|
sendpage: sock_no_sendpage,
|
| 1011 |
|
|
};
|
| 1012 |
|
|
|
| 1013 |
|
|
struct net_proto_family netlink_family_ops = {
|
| 1014 |
|
|
PF_NETLINK,
|
| 1015 |
|
|
netlink_create
|
| 1016 |
|
|
};
|
| 1017 |
|
|
|
| 1018 |
|
|
static int __init netlink_proto_init(void)
|
| 1019 |
|
|
{
|
| 1020 |
|
|
struct sk_buff *dummy_skb;
|
| 1021 |
|
|
|
| 1022 |
|
|
if (sizeof(struct netlink_skb_parms) > sizeof(dummy_skb->cb)) {
|
| 1023 |
|
|
printk(KERN_CRIT "netlink_init: panic\n");
|
| 1024 |
|
|
return -1;
|
| 1025 |
|
|
}
|
| 1026 |
|
|
sock_register(&netlink_family_ops);
|
| 1027 |
|
|
#ifdef CONFIG_PROC_FS
|
| 1028 |
|
|
create_proc_read_entry("net/netlink", 0, 0, netlink_read_proc, NULL);
|
| 1029 |
|
|
#endif
|
| 1030 |
|
|
return 0;
|
| 1031 |
|
|
}
|
| 1032 |
|
|
|
| 1033 |
|
|
static void __exit netlink_proto_exit(void)
|
| 1034 |
|
|
{
|
| 1035 |
|
|
sock_unregister(PF_NETLINK);
|
| 1036 |
|
|
remove_proc_entry("net/netlink", NULL);
|
| 1037 |
|
|
}
|
| 1038 |
|
|
|
| 1039 |
|
|
module_init(netlink_proto_init);
|
| 1040 |
|
|
module_exit(netlink_proto_exit);
|
