Release 4.11 net/netlink/af_netlink.c

Directory: net/netlink
/*
 * NETLINK      Kernel-user communication protocol.
 *
 *              Authors:        Alan Cox <alan@lxorguk.ukuu.org.uk>
 *                              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
 *                              Patrick McHardy <kaber@trash.net>
 *
 *              This program is free software; you can redistribute it and/or
 *              modify it under the terms of the GNU General Public License
 *              as published by the Free Software Foundation; either version
 *              2 of the License, or (at your option) any later version.
 *
 * Tue Jun 26 14:36:48 MEST 2001 Herbert "herp" Rosmanith
 *                               added netlink_proto_exit
 * Tue Jan 22 18:32:44 BRST 2002 Arnaldo C. de Melo <acme@conectiva.com.br>
 *                               use nlk_sk, as sk->protinfo is on a diet 8)
 * Fri Jul 22 19:51:12 MEST 2005 Harald Welte <laforge@gnumonks.org>
 *                               - inc module use count of module that owns
 *                                 the kernel socket in case userspace opens
 *                                 socket of same protocol
 *                               - remove all module support, since netlink is
 *                                 mandatory if CONFIG_NET=y these days
 */

#include <linux/module.h>

#include <linux/capability.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/socket.h>
#include <linux/un.h>
#include <linux/fcntl.h>
#include <linux/termios.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/notifier.h>
#include <linux/security.h>
#include <linux/jhash.h>
#include <linux/jiffies.h>
#include <linux/random.h>
#include <linux/bitops.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <linux/audit.h>
#include <linux/mutex.h>
#include <linux/vmalloc.h>
#include <linux/if_arp.h>
#include <linux/rhashtable.h>
#include <asm/cacheflush.h>
#include <linux/hash.h>
#include <linux/genetlink.h>

#include <net/net_namespace.h>
#include <net/sock.h>
#include <net/scm.h>
#include <net/netlink.h>

#include "af_netlink.h"


struct listeners {
	
struct rcu_head		rcu;
	
unsigned long		masks[0];
};

/* state bits */

#define NETLINK_S_CONGESTED		0x0

/* flags */

#define NETLINK_F_KERNEL_SOCKET		0x1

#define NETLINK_F_RECV_PKTINFO		0x2

#define NETLINK_F_BROADCAST_SEND_ERROR	0x4

#define NETLINK_F_RECV_NO_ENOBUFS	0x8

#define NETLINK_F_LISTEN_ALL_NSID	0x10

#define NETLINK_F_CAP_ACK		0x20



static inline int netlink_is_kernel(struct sock *sk)
{
	return nlk_sk(sk)->flags & NETLINK_F_KERNEL_SOCKET;
}

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Denis V. Lunev 21 95.45% 1 50.00%
Nicolas Dichtel 1 4.55% 1 50.00%
Total 22 100.00% 2 100.00%


struct netlink_table *nl_table __read_mostly;

EXPORT_SYMBOL_GPL(nl_table);

static DECLARE_WAIT_QUEUE_HEAD(nl_table_wait);


static struct lock_class_key nlk_cb_mutex_keys[MAX_LINKS];


static const char *const nlk_cb_mutex_key_strings[MAX_LINKS + 1] = {
	"nlk_cb_mutex-ROUTE",
	"nlk_cb_mutex-1",
	"nlk_cb_mutex-USERSOCK",
	"nlk_cb_mutex-FIREWALL",
	"nlk_cb_mutex-SOCK_DIAG",
	"nlk_cb_mutex-NFLOG",
	"nlk_cb_mutex-XFRM",
	"nlk_cb_mutex-SELINUX",
	"nlk_cb_mutex-ISCSI",
	"nlk_cb_mutex-AUDIT",
	"nlk_cb_mutex-FIB_LOOKUP",
	"nlk_cb_mutex-CONNECTOR",
	"nlk_cb_mutex-NETFILTER",
	"nlk_cb_mutex-IP6_FW",
	"nlk_cb_mutex-DNRTMSG",
	"nlk_cb_mutex-KOBJECT_UEVENT",
	"nlk_cb_mutex-GENERIC",
	"nlk_cb_mutex-17",
	"nlk_cb_mutex-SCSITRANSPORT",
	"nlk_cb_mutex-ECRYPTFS",
	"nlk_cb_mutex-RDMA",
	"nlk_cb_mutex-CRYPTO",
	"nlk_cb_mutex-SMC",
	"nlk_cb_mutex-23",
	"nlk_cb_mutex-24",
	"nlk_cb_mutex-25",
	"nlk_cb_mutex-26",
	"nlk_cb_mutex-27",
	"nlk_cb_mutex-28",
	"nlk_cb_mutex-29",
	"nlk_cb_mutex-30",
	"nlk_cb_mutex-31",
	"nlk_cb_mutex-MAX_LINKS"
};

static int netlink_dump(struct sock *sk);
static void netlink_skb_destructor(struct sk_buff *skb);

/* nl_table locking explained:
 * Lookup and traversal are protected with an RCU read-side lock. Insertion
 * and removal are protected with per bucket lock while using RCU list
 * modification primitives and may run in parallel to RCU protected lookups.
 * Destruction of the Netlink socket may only occur *after* nl_table_lock has
 * been acquired * either during or after the socket has been removed from
 * the list and after an RCU grace period.
 */

DEFINE_RWLOCK(nl_table_lock);

EXPORT_SYMBOL_GPL(nl_table_lock);

static atomic_t nl_table_users = ATOMIC_INIT(0);


#define nl_deref_protected(X) rcu_dereference_protected(X, lockdep_is_held(&nl_table_lock));

static BLOCKING_NOTIFIER_HEAD(netlink_chain);

static DEFINE_SPINLOCK(netlink_tap_lock);

static struct list_head netlink_tap_all __read_mostly;


static const struct rhashtable_params netlink_rhashtable_params;



static inline u32 netlink_group_mask(u32 group)
{
	return group ? 1 << (group - 1) : 0;
}

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Patrick McHardy 22 95.65% 1 50.00%
Stephen Hemminger 1 4.35% 1 50.00%
Total 23 100.00% 2 100.00%



static struct sk_buff *netlink_to_full_skb(const struct sk_buff *skb,
					   gfp_t gfp_mask)
{
	unsigned int len = skb_end_offset(skb);
	struct sk_buff *new;

	new = alloc_skb(len, gfp_mask);
	if (new == NULL)
		return NULL;

	NETLINK_CB(new).portid = NETLINK_CB(skb).portid;
	NETLINK_CB(new).dst_group = NETLINK_CB(skb).dst_group;
	NETLINK_CB(new).creds = NETLINK_CB(skb).creds;

	memcpy(skb_put(new, len), skb->data, len);
	return new;
}

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Daniel Borkmann 110 100.00% 1 100.00%
Total 110 100.00% 1 100.00%



int netlink_add_tap(struct netlink_tap *nt)
{
	if (unlikely(nt->dev->type != ARPHRD_NETLINK))
		return -EINVAL;

	spin_lock(&netlink_tap_lock);
	list_add_rcu(&nt->list, &netlink_tap_all);
	spin_unlock(&netlink_tap_lock);

	__module_get(nt->module);

	return 0;
}
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Daniel Borkmann 60 100.00% 1 100.00%
Total 60 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(netlink_add_tap);



static int __netlink_remove_tap(struct netlink_tap *nt)
{
	bool found = false;
	struct netlink_tap *tmp;

	spin_lock(&netlink_tap_lock);

	list_for_each_entry(tmp, &netlink_tap_all, list) {
		if (nt == tmp) {
			list_del_rcu(&nt->list);
			found = true;
			goto out;
		}
	}

	pr_warn("__netlink_remove_tap: %p not found\n", nt);
out:
	spin_unlock(&netlink_tap_lock);

	if (found)
		module_put(nt->module);

	return found ? 0 : -ENODEV;
}

Contributors
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Daniel Borkmann 93 98.94% 1 50.00%
Stephen Hemminger 1 1.06% 1 50.00%
Total 94 100.00% 2 100.00%



int netlink_remove_tap(struct netlink_tap *nt)
{
	int ret;

	ret = __netlink_remove_tap(nt);
	synchronize_net();

	return ret;
}
Contributors
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Daniel Borkmann 26 100.00% 1 100.00%
Total 26 100.00% 1 100.00%


EXPORT_SYMBOL_GPL(netlink_remove_tap);



static bool netlink_filter_tap(const struct sk_buff *skb)
{
	struct sock *sk = skb->sk;

	/* We take the more conservative approach and
         * whitelist socket protocols that may pass.
         */
	switch (sk->sk_protocol) {
	case NETLINK_ROUTE:
	case NETLINK_USERSOCK:
	case NETLINK_SOCK_DIAG:
	case NETLINK_NFLOG:
	case NETLINK_XFRM:
	case NETLINK_FIB_LOOKUP:
	case NETLINK_NETFILTER:
	case NETLINK_GENERIC:
		return true;
	}

	return false;
}

Contributors
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Daniel Borkmann 57 95.00% 1 50.00%
Varka Bhadram 3 5.00% 1 50.00%
Total 60 100.00% 2 100.00%



static int __netlink_deliver_tap_skb(struct sk_buff *skb,
				     struct net_device *dev)
{
	struct sk_buff *nskb;
	struct sock *sk = skb->sk;
	int ret = -ENOMEM;

	dev_hold(dev);

	if (is_vmalloc_addr(skb->head))
		nskb = netlink_to_full_skb(skb, GFP_ATOMIC);
	else
		nskb = skb_clone(skb, GFP_ATOMIC);
	if (nskb) {
		nskb->dev = dev;
		nskb->protocol = htons((u16) sk->sk_protocol);
		nskb->pkt_type = netlink_is_kernel(sk) ?
				 PACKET_KERNEL : PACKET_USER;
		skb_reset_network_header(nskb);
		ret = dev_queue_xmit(nskb);
		if (unlikely(ret > 0))
			ret = net_xmit_errno(ret);
	}

	dev_put(dev);
	return ret;
}

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Daniel Borkmann 144 100.00% 5 100.00%
Total 144 100.00% 5 100.00%



static void __netlink_deliver_tap(struct sk_buff *skb)
{
	int ret;
	struct netlink_tap *tmp;

	if (!netlink_filter_tap(skb))
		return;

	list_for_each_entry_rcu(tmp, &netlink_tap_all, list) {
		ret = __netlink_deliver_tap_skb(skb, tmp->dev);
		if (unlikely(ret))
			break;
	}
}

Contributors
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Daniel Borkmann 57 100.00% 2 100.00%
Total 57 100.00% 2 100.00%



static void netlink_deliver_tap(struct sk_buff *skb)
{
	rcu_read_lock();

	if (unlikely(!list_empty(&netlink_tap_all)))
		__netlink_deliver_tap(skb);

	rcu_read_unlock();
}

Contributors
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Daniel Borkmann 34 100.00% 1 100.00%
Total 34 100.00% 1 100.00%



static void netlink_deliver_tap_kernel(struct sock *dst, struct sock *src,
				       struct sk_buff *skb)
{
	if (!(netlink_is_kernel(dst) && netlink_is_kernel(src)))
		netlink_deliver_tap(skb);
}

Contributors
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Daniel Borkmann 41 100.00% 1 100.00%
Total 41 100.00% 1 100.00%



static void netlink_overrun(struct sock *sk)
{
	struct netlink_sock *nlk = nlk_sk(sk);

	if (!(nlk->flags & NETLINK_F_RECV_NO_ENOBUFS)) {
		if (!test_and_set_bit(NETLINK_S_CONGESTED,
				      &nlk_sk(sk)->state)) {
			sk->sk_err = ENOBUFS;
			sk->sk_error_report(sk);
		}
	}
	atomic_inc(&sk->sk_drops);
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 71 97.26% 1 50.00%
Nicolas Dichtel 2 2.74% 1 50.00%
Total 73 100.00% 2 100.00%



static void netlink_rcv_wake(struct sock *sk)
{
	struct netlink_sock *nlk = nlk_sk(sk);

	if (skb_queue_empty(&sk->sk_receive_queue))
		clear_bit(NETLINK_S_CONGESTED, &nlk->state);
	if (!test_bit(NETLINK_S_CONGESTED, &nlk->state))
		wake_up_interruptible(&nlk->wait);
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 60 96.77% 1 50.00%
Nicolas Dichtel 2 3.23% 1 50.00%
Total 62 100.00% 2 100.00%



static void netlink_skb_destructor(struct sk_buff *skb)
{
	if (is_vmalloc_addr(skb->head)) {
		if (!skb->cloned ||
		    !atomic_dec_return(&(skb_shinfo(skb)->dataref)))
			vfree(skb->head);

		skb->head = NULL;
	}
	if (skb->sk != NULL)
		sock_rfree(skb);
}

Contributors
Person Tokens Prop Commits CommitProp
Florian Westphal 57 82.61% 1 50.00%
Patrick McHardy 12 17.39% 1 50.00%
Total 69 100.00% 2 100.00%



static void netlink_skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
{
	WARN_ON(skb->sk != NULL);
	skb->sk = sk;
	skb->destructor = netlink_skb_destructor;
	atomic_add(skb->truesize, &sk->sk_rmem_alloc);
	sk_mem_charge(sk, skb->truesize);
}

Contributors
Person Tokens Prop Commits CommitProp
Florian Westphal 40 68.97% 1 33.33%
Patrick McHardy 18 31.03% 2 66.67%
Total 58 100.00% 3 100.00%



static void netlink_sock_destruct(struct sock *sk)
{
	struct netlink_sock *nlk = nlk_sk(sk);

	if (nlk->cb_running) {
		if (nlk->cb.done)
			nlk->cb.done(&nlk->cb);
		module_put(nlk->cb.module);
		kfree_skb(nlk->cb.skb);
	}

	skb_queue_purge(&sk->sk_receive_queue);

	if (!sock_flag(sk, SOCK_DEAD)) {
		printk(KERN_ERR "Freeing alive netlink socket %p\n", sk);
		return;
	}

	WARN_ON(atomic_read(&sk->sk_rmem_alloc));
	WARN_ON(atomic_read(&sk->sk_wmem_alloc));
	WARN_ON(nlk_sk(sk)->groups);
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 37 28.91% 2 16.67%
Florian Westphal 32 25.00% 1 8.33%
Patrick McHardy 25 19.53% 3 25.00%
Herbert Xu 21 16.41% 1 8.33%
Arnaldo Carvalho de Melo 5 3.91% 2 16.67%
David S. Miller 3 2.34% 1 8.33%
Ilpo Järvinen 3 2.34% 1 8.33%
James Morris 2 1.56% 1 8.33%
Total 128 100.00% 12 100.00%



static void netlink_sock_destruct_work(struct work_struct *work)
{
	struct netlink_sock *nlk = container_of(work, struct netlink_sock,
						work);

	sk_free(&nlk->sk);
}

Contributors
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Herbert Xu 34 100.00% 2 100.00%
Total 34 100.00% 2 100.00%

/* This lock without WQ_FLAG_EXCLUSIVE is good on UP and it is _very_ bad on
 * SMP. Look, when several writers sleep and reader wakes them up, all but one
 * immediately hit write lock and grab all the cpus. Exclusive sleep solves
 * this, _but_ remember, it adds useless work on UP machines.
 */


void netlink_table_grab(void)
	__acquires
(nl_table_lock)
{
	might_sleep();

	write_lock_irq(&nl_table_lock);

	if (atomic_read(&nl_table_users)) {
		DECLARE_WAITQUEUE(wait, current);

		add_wait_queue_exclusive(&nl_table_wait, &wait);
		for (;;) {
			set_current_state(TASK_UNINTERRUPTIBLE);
			if (atomic_read(&nl_table_users) == 0)
				break;
			write_unlock_irq(&nl_table_lock);
			schedule();
			write_lock_irq(&nl_table_lock);
		}

		__set_current_state(TASK_RUNNING);
		remove_wait_queue(&nl_table_wait, &wait);
	}
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 88 89.80% 4 57.14%
Eric Dumazet 4 4.08% 1 14.29%
Arjan van de Ven 3 3.06% 1 14.29%
Johannes Berg 3 3.06% 1 14.29%
Total 98 100.00% 7 100.00%


void netlink_table_ungrab(void)
	__releases
(nl_table_lock)
{
	write_unlock_irq(&nl_table_lock);
	wake_up(&nl_table_wait);
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 18 78.26% 3 60.00%
Eric Dumazet 4 17.39% 1 20.00%
Arjan van de Ven 1 4.35% 1 20.00%
Total 23 100.00% 5 100.00%


static inline void

netlink_lock_table(void)
{
	/* read_lock() synchronizes us to netlink_table_grab */

	read_lock(&nl_table_lock);
	atomic_inc(&nl_table_users);
	read_unlock(&nl_table_lock);
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 27 96.43% 2 66.67%
Patrick McHardy 1 3.57% 1 33.33%
Total 28 100.00% 3 100.00%


static inline void

netlink_unlock_table(void)
{
	if (atomic_dec_and_test(&nl_table_users))
		wake_up(&nl_table_wait);
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 22 95.65% 2 66.67%
Patrick McHardy 1 4.35% 1 33.33%
Total 23 100.00% 3 100.00%


struct netlink_compare_arg
{
	
possible_net_t pnet;
	
u32 portid;
};

/* Doing sizeof directly may yield 4 extra bytes on 64-bit. */

#define netlink_compare_arg_len \
	(offsetof(struct netlink_compare_arg, portid) + sizeof(u32))



static inline int netlink_compare(struct rhashtable_compare_arg *arg,
				  const void *ptr)
{
	const struct netlink_compare_arg *x = arg->key;
	const struct netlink_sock *nlk = ptr;

	return nlk->portid != x->portid ||
	       !net_eq(sock_net(&nlk->sk), read_pnet(&x->pnet));
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 26 40.62% 2 50.00%
Thomas Graf 23 35.94% 1 25.00%
Gao Feng 15 23.44% 1 25.00%
Total 64 100.00% 4 100.00%



static void netlink_compare_arg_init(struct netlink_compare_arg *arg,
				     struct net *net, u32 portid)
{
	memset(arg, 0, sizeof(*arg));
	write_pnet(&arg->pnet, net);
	arg->portid = portid;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 48 100.00% 1 100.00%
Total 48 100.00% 1 100.00%



static struct sock *__netlink_lookup(struct netlink_table *table, u32 portid,
				     struct net *net)
{
	struct netlink_compare_arg arg;

	netlink_compare_arg_init(&arg, net, portid);
	return rhashtable_lookup_fast(&table->hash, &arg,
				      netlink_rhashtable_params);
}

Contributors
Person Tokens Prop Commits CommitProp
Thomas Graf 33 67.35% 2 50.00%
Herbert Xu 12 24.49% 1 25.00%
Gao Feng 4 8.16% 1 25.00%
Total 49 100.00% 4 100.00%



static int __netlink_insert(struct netlink_table *table, struct sock *sk)
{
	struct netlink_compare_arg arg;

	netlink_compare_arg_init(&arg, sock_net(sk), nlk_sk(sk)->portid);
	return rhashtable_lookup_insert_key(&table->hash, &arg,
					    &nlk_sk(sk)->node,
					    netlink_rhashtable_params);
}

Contributors
Person Tokens Prop Commits CommitProp
Ying Xue 40 66.67% 1 25.00%
Herbert Xu 20 33.33% 3 75.00%
Total 60 100.00% 4 100.00%



static struct sock *netlink_lookup(struct net *net, int protocol, u32 portid)
{
	struct netlink_table *table = &nl_table[protocol];
	struct sock *sk;

	rcu_read_lock();
	sk = __netlink_lookup(table, portid, net);
	if (sk)
		sock_hold(sk);
	rcu_read_unlock();

	return sk;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 21 32.81% 1 12.50%
Linus Torvalds (pre-git) 17 26.56% 2 25.00%
Thomas Graf 9 14.06% 1 12.50%
Herbert Xu 8 12.50% 1 12.50%
Gao Feng 4 6.25% 1 12.50%
Arnaldo Carvalho de Melo 3 4.69% 1 12.50%
Eric W. Biedermann 2 3.12% 1 12.50%
Total 64 100.00% 8 100.00%


static const struct proto_ops netlink_ops;


static void

netlink_update_listeners(struct sock *sk)
{
	struct netlink_table *tbl = &nl_table[sk->sk_protocol];
	unsigned long mask;
	unsigned int i;
	struct listeners *listeners;

	listeners = nl_deref_protected(tbl->listeners);
	if (!listeners)
		return;

	for (i = 0; i < NLGRPLONGS(tbl->groups); i++) {
		mask = 0;
		sk_for_each_bound(sk, &tbl->mc_list) {
			if (i < NLGRPLONGS(nlk_sk(sk)->ngroups))
				mask |= nlk_sk(sk)->groups[i];
		}
		listeners->masks[i] = mask;
	}
	/* this function is only called with the netlink table "grabbed", which
         * makes sure updates are visible before bind or setsockopt return. */
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 81 67.50% 1 25.00%
Eric Dumazet 22 18.33% 2 50.00%
Johannes Berg 17 14.17% 1 25.00%
Total 120 100.00% 4 100.00%



static int netlink_insert(struct sock *sk, u32 portid)
{
	struct netlink_table *table = &nl_table[sk->sk_protocol];
	int err;

	lock_sock(sk);

	err = nlk_sk(sk)->portid == portid ? 0 : -EBUSY;
	if (nlk_sk(sk)->bound)
		goto err;

	err = -ENOMEM;
	if (BITS_PER_LONG > 32 &&
	    unlikely(atomic_read(&table->hash.nelems) >= UINT_MAX))
		goto err;

	nlk_sk(sk)->portid = portid;
	sock_hold(sk);

	err = __netlink_insert(table, sk);
	if (err) {
		/* In case the hashtable backend returns with -EBUSY
                 * from here, it must not escape to the caller.
                 */
		if (unlikely(err == -EBUSY))
			err = -EOVERFLOW;
		if (err == -EEXIST)
			err = -EADDRINUSE;
		sock_put(sk);
		goto err;
	}

	/* We need to ensure that the socket is hashed and visible. */
	smp_wmb();
	nlk_sk(sk)->bound = portid;

err:
	release_sock(sk);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 125 69.44% 6 50.00%
Thomas Graf 24 13.33% 2 16.67%
Daniel Borkmann 16 8.89% 1 8.33%
Ying Xue 10 5.56% 1 8.33%
Gao Feng 3 1.67% 1 8.33%
Eric W. Biedermann 2 1.11% 1 8.33%
Total 180 100.00% 12 100.00%



static void netlink_remove(struct sock *sk)
{
	struct netlink_table *table;

	table = &nl_table[sk->sk_protocol];
	if (!rhashtable_remove_fast(&table->hash, &nlk_sk(sk)->node,
				    netlink_rhashtable_params)) {
		WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
		__sock_put(sk);
	}

	netlink_table_grab();
	if (nlk_sk(sk)->subscriptions) {
		__sk_del_bind_node(sk);
		netlink_update_listeners(sk);
	}
	if (sk->sk_protocol == NETLINK_GENERIC)
		atomic_inc(&genl_sk_destructing_cnt);
	netlink_table_ungrab();
}

Contributors
Person Tokens Prop Commits CommitProp
Thomas Graf 47 43.52% 1 12.50%
Herbert Xu 33 30.56% 2 25.00%
Johannes Berg 21 19.44% 2 25.00%
Linus Torvalds (pre-git) 6 5.56% 2 25.00%
Patrick McHardy 1 0.93% 1 12.50%
Total 108 100.00% 8 100.00%


static struct proto netlink_proto = {
	.name	  = "NETLINK",
	.owner	  = THIS_MODULE,
	.obj_size = sizeof(struct netlink_sock),
};



static int __netlink_create(struct net *net, struct socket *sock,
			    struct mutex *cb_mutex, int protocol,
			    int kern)
{
	struct sock *sk;
	struct netlink_sock *nlk;

	sock->ops = &netlink_ops;

	sk = sk_alloc(net, PF_NETLINK, GFP_KERNEL, &netlink_proto, kern);
	if (!sk)
		return -ENOMEM;

	sock_init_data(sock, sk);

	nlk = nlk_sk(sk);
	if (cb_mutex) {
		nlk->cb_mutex = cb_mutex;
	} else {
		nlk->cb_mutex = &nlk->cb_def_mutex;
		mutex_init(nlk->cb_mutex);
		lockdep_set_class_and_name(nlk->cb_mutex,
					   nlk_cb_mutex_keys + protocol,
					   nlk_cb_mutex_key_strings[protocol]);
	}
	init_waitqueue_head(&nlk->wait);

	sk->sk_destruct = netlink_sock_destruct;
	sk->sk_protocol = protocol;
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 101 66.01% 3 30.00%
Linus Torvalds (pre-git) 17 11.11% 1 10.00%
Herbert Xu 16 10.46% 1 10.00%
Eric W. Biedermann 12 7.84% 2 20.00%
David S. Miller 4 2.61% 1 10.00%
Eric Dumazet 2 1.31% 1 10.00%
Arnaldo Carvalho de Melo 1 0.65% 1 10.00%
Total 153 100.00% 10 100.00%



static int netlink_create(struct net *net, struct socket *sock, int protocol,
			  int kern)
{
	struct module *module = NULL;
	struct mutex *cb_mutex;
	struct netlink_sock *nlk;
	int (*bind)(struct net *net, int group);
	void (*unbind)(struct net *net, int group);
	int err = 0;

	sock->state = SS_UNCONNECTED;

	if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
		return -ESOCKTNOSUPPORT;

	if (protocol < 0 || protocol >= MAX_LINKS)
		return -EPROTONOSUPPORT;

	netlink_lock_table();
#ifdef CONFIG_MODULES
	if (!nl_table[protocol].registered) {
		netlink_unlock_table();
		request_module("net-pf-%d-proto-%d", PF_NETLINK, protocol);
		netlink_lock_table();
	}
#endif
	if (nl_table[protocol].registered &&
	    try_module_get(nl_table[protocol].module))
		module = nl_table[protocol].module;
	else
		err = -EPROTONOSUPPORT;
	cb_mutex = nl_table[protocol].cb_mutex;
	bind = nl_table[protocol].bind;
	unbind = nl_table[protocol].unbind;
	netlink_unlock_table();

	if (err < 0)
		goto out;

	err = __netlink_create(net, sock, cb_mutex, protocol, kern);
	if (err < 0)
		goto out_module;

	local_bh_disable();
	sock_prot_inuse_add(net, &netlink_proto, 1);
	local_bh_enable();

	nlk = nlk_sk(sock->sk);
	nlk->module = module;
	nlk->netlink_bind = bind;
	nlk->netlink_unbind = unbind;
out:
	return err;

out_module:
	module_put(module);
	goto out;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 115 38.08% 5 26.32%
Linus Torvalds (pre-git) 50 16.56% 2 10.53%
Harald Welte 32 10.60% 1 5.26%
Richard Guy Briggs 26 8.61% 1 5.26%
Pablo Neira Ayuso 24 7.95% 1 5.26%
Alexey Dobriyan 15 4.97% 1 5.26%
Johannes Berg 11 3.64% 2 10.53%
Eric Dumazet 10 3.31% 1 5.26%
Eric W. Biedermann 9 2.98% 2 10.53%
David S. Miller 6 1.99% 1 5.26%
Eric Paris 3 0.99% 1 5.26%
Arnaldo Carvalho de Melo 1 0.33% 1 5.26%
Total 302 100.00% 19 100.00%



static void deferred_put_nlk_sk(struct rcu_head *head)
{
	struct netlink_sock *nlk = container_of(head, struct netlink_sock, rcu);
	struct sock *sk = &nlk->sk;

	if (!atomic_dec_and_test(&sk->sk_refcnt))
		return;

	if (nlk->cb_running && nlk->cb.done) {
		INIT_WORK(&nlk->work, netlink_sock_destruct_work);
		schedule_work(&nlk->work);
		return;
	}

	sk_free(sk);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 53 61.63% 1 50.00%
Thomas Graf 33 38.37% 1 50.00%
Total 86 100.00% 2 100.00%



static int netlink_release(struct socket *sock)
{
	struct sock *sk = sock->sk;
	struct netlink_sock *nlk;

	if (!sk)
		return 0;

	netlink_remove(sk);
	sock_orphan(sk);
	nlk = nlk_sk(sk);

	/*
         * OK. Socket is unlinked, any packets that arrive now
         * will be purged.
         */

	/* must not acquire netlink_table_lock in any way again before unbind
         * and notifying genetlink is done as otherwise it might deadlock
         */
	if (nlk->netlink_unbind) {
		int i;

		for (i = 0; i < nlk->ngroups; i++)
			if (test_bit(i, nlk->groups))
				nlk->netlink_unbind(sock_net(sk), i + 1);
	}
	if (sk->sk_protocol == NETLINK_GENERIC &&
	    atomic_dec_return(&genl_sk_destructing_cnt) == 0)
		wake_up(&genl_sk_destructing_waitq);

	sock->sk = NULL;
	wake_up_interruptible_all(&nlk->wait);

	skb_queue_purge(&sk->sk_write_queue);

	if (nlk->portid && nlk->bound) {
		struct netlink_notify n = {
						.net = sock_net(sk),
						.protocol = sk->sk_protocol,
						.portid = nlk->portid,
                                          };
		blocking_notifier_call_chain(&netlink_chain,
				NETLINK_URELEASE, &n);
	}

	module_put(nlk->module);

	if (netlink_is_kernel(sk)) {
		netlink_table_grab();
		BUG_ON(nl_table[sk->sk_protocol].registered == 0);
		if (--nl_table[sk->sk_protocol].registered == 0) {
			struct listeners *old;

			old = nl_deref_protected(nl_table[sk->sk_protocol].listeners);
			RCU_INIT_POINTER(nl_table[sk->sk_protocol].listeners, NULL);
			kfree_rcu(old, rcu);
			nl_table[sk->sk_protocol].module = NULL;
			nl_table[sk->sk_protocol].bind = NULL;
			nl_table[sk->sk_protocol].unbind = NULL;
			nl_table[sk->sk_protocol].flags = 0;
			nl_table[sk->sk_protocol].registered = 0;
		}
		netlink_table_ungrab();
	}

	kfree(nlk->groups);
	nlk->groups = NULL;

	local_bh_disable();
	sock_prot_inuse_add(sock_net(sk), &netlink_proto, -1);
	local_bh_enable();
	call_rcu(&nlk->rcu, deferred_put_nlk_sk);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Johannes Berg 78 19.95% 2 6.45%
Linus Torvalds (pre-git) 59 15.09% 3 9.68%
Eric Dumazet 49 12.53% 3 9.68%
Patrick McHardy 43 11.00% 4 12.90%
Denis V. Lunev 38 9.72% 3 9.68%
James Morris 27 6.91% 1 3.23%
Pablo Neira Ayuso 22 5.63% 1 3.23%
Harald Welte 18 4.60% 1 3.23%
David S. Miller 14 3.58% 2 6.45%
Richard Guy Briggs 11 2.81% 1 3.23%
Eric W. Biedermann 8 2.05% 2 6.45%
Thomas Graf 7 1.79% 1 3.23%
Dmitry Ivanov 4 1.02% 1 3.23%
Arnaldo Carvalho de Melo 4 1.02% 2 6.45%
Art Haas 4 1.02% 1 3.23%
Hideaki Yoshifuji / 吉藤英明 3 0.77% 1 3.23%
Herbert Xu 1 0.26% 1 3.23%
Américo Wang 1 0.26% 1 3.23%
Total 391 100.00% 31 100.00%



static int netlink_autobind(struct socket *sock)
{
	struct sock *sk = sock->sk;
	struct net *net = sock_net(sk);
	struct netlink_table *table = &nl_table[sk->sk_protocol];
	s32 portid = task_tgid_vnr(current);
	int err;
	s32 rover = -4096;
	bool ok;

retry:
	cond_resched();
	rcu_read_lock();
	ok = !__netlink_lookup(table, portid, net);
	rcu_read_unlock();
	if (!ok) {
		/* Bind collision, search negative portid values. */
		if (rover == -4096)
			/* rover will be in range [S32_MIN, -4097] */
			rover = S32_MIN + prandom_u32_max(-4096 - S32_MIN);
		else if (rover >= -4096)
			rover = -4097;
		portid = rover--;
		goto retry;
	}

	err = netlink_insert(sk, portid);
	if (err == -EADDRINUSE)
		goto retry;

	/* If 2 threads race to autobind, that is fine.  */
	if (err == -EBUSY)
		err = 0;

	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 69 40.83% 3 21.43%
Linus Torvalds (pre-git) 61 36.09% 2 14.29%
David S. Miller 14 8.28% 2 14.29%
Eric W. Biedermann 12 7.10% 2 14.29%
Thomas Goff 3 1.78% 1 7.14%
Thomas Graf 3 1.78% 1 7.14%
Hideaki Yoshifuji / 吉藤英明 3 1.78% 1 7.14%
Gao Feng 3 1.78% 1 7.14%
Arnaldo Carvalho de Melo 1 0.59% 1 7.14%
Total 169 100.00% 14 100.00%

/**
 * __netlink_ns_capable - General netlink message capability test
 * @nsp: NETLINK_CB of the socket buffer holding a netlink command from userspace.
 * @user_ns: The user namespace of the capability to use
 * @cap: The capability to use
 *
 * Test to see if the opener of the socket we received the message
 * from had when the netlink socket was created and the sender of the
 * message has has the capability @cap in the user namespace @user_ns.
 */


bool __netlink_ns_capable(const struct netlink_skb_parms *nsp,
			struct user_namespace *user_ns, int cap)
{
	return ((nsp->flags & NETLINK_SKB_DST) ||
		file_ns_capable(nsp->sk->sk_socket->file, user_ns, cap)) &&
		ns_capable(user_ns, cap);
}
Contributors
Person Tokens Prop Commits CommitProp
Eric W. Biedermann 52 100.00% 2 100.00%
Total 52 100.00% 2 100.00%


EXPORT_SYMBOL(__netlink_ns_capable);

/**
 * netlink_ns_capable - General netlink message capability test
 * @skb: socket buffer holding a netlink command from userspace
 * @user_ns: The user namespace of the capability to use
 * @cap: The capability to use
 *
 * Test to see if the opener of the socket we received the message
 * from had when the netlink socket was created and the sender of the
 * message has has the capability @cap in the user namespace @user_ns.
 */


bool netlink_ns_capable(const struct sk_buff *skb,
			struct user_namespace *user_ns, int cap)
{
	return __netlink_ns_capable(&NETLINK_CB(skb), user_ns, cap);
}
Contributors
Person Tokens Prop Commits CommitProp
Eric W. Biedermann 33 100.00% 1 100.00%
Total 33 100.00% 1 100.00%


EXPORT_SYMBOL(netlink_ns_capable);

/**
 * netlink_capable - Netlink global message capability test
 * @skb: socket buffer holding a netlink command from userspace
 * @cap: The capability to use
 *
 * Test to see if the opener of the socket we received the message
 * from had when the netlink socket was created and the sender of the
 * message has has the capability @cap in all user namespaces.
 */


bool netlink_capable(const struct sk_buff *skb, int cap)
{
	return netlink_ns_capable(skb, &init_user_ns, cap);
}
Contributors
Person Tokens Prop Commits CommitProp
Eric W. Biedermann 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%


EXPORT_SYMBOL(netlink_capable);

/**
 * netlink_net_capable - Netlink network namespace message capability test
 * @skb: socket buffer holding a netlink command from userspace
 * @cap: The capability to use
 *
 * Test to see if the opener of the socket we received the message
 * from had when the netlink socket was created and the sender of the
 * message has has the capability @cap over the network namespace of
 * the socket we received the message from.
 */


bool netlink_net_capable(const struct sk_buff *skb, int cap)
{
	return netlink_ns_capable(skb, sock_net(skb->sk)->user_ns, cap);
}
Contributors
Person Tokens Prop Commits CommitProp
Eric W. Biedermann 31 100.00% 1 100.00%
Total 31 100.00% 1 100.00%


EXPORT_SYMBOL(netlink_net_capable);



static inline int netlink_allowed(const struct socket *sock, unsigned int flag)
{
	return (nl_table[sock->sk->sk_protocol].flags & flag) ||
		ns_capable(sock_net(sock->sk)->user_ns, CAP_NET_ADMIN);
}

Contributors
Person Tokens Prop Commits CommitProp
James Morris 30 63.83% 1 12.50%
Eric W. Biedermann 11 23.40% 2 25.00%
Pablo Neira Ayuso 3 6.38% 2 25.00%
Stephen Hemminger 1 2.13% 1 12.50%
Herbert Xu 1 2.13% 1 12.50%
Arnaldo Carvalho de Melo 1 2.13% 1 12.50%
Total 47 100.00% 8 100.00%


static void

netlink_update_subscriptions(struct sock *sk, unsigned int subscriptions)
{
	struct netlink_sock *nlk = nlk_sk(sk);

	if (nlk->subscriptions && !subscriptions)
		__sk_del_bind_node(sk);
	else if (!nlk->subscriptions && subscriptions)
		sk_add_bind_node(sk, &nl_table[sk->sk_protocol].mc_list);
	nlk->subscriptions = subscriptions;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 70 100.00% 1 100.00%
Total 70 100.00% 1 100.00%



static int netlink_realloc_groups(struct sock *sk)
{
	struct netlink_sock *nlk = nlk_sk(sk);
	unsigned int groups;
	unsigned long *new_groups;
	int err = 0;

	netlink_table_grab();

	groups = nl_table[sk->sk_protocol].groups;
	if (!nl_table[sk->sk_protocol].registered) {
		err = -ENOENT;
		goto out_unlock;
	}

	if (nlk->ngroups >= groups)
		goto out_unlock;

	new_groups = krealloc(nlk->groups, NLGRPSZ(groups), GFP_ATOMIC);
	if (new_groups == NULL) {
		err = -ENOMEM;
		goto out_unlock;
	}
	memset((char *)new_groups + NLGRPSZ(nlk->ngroups), 0,
	       NLGRPSZ(groups) - NLGRPSZ(nlk->ngroups));

	nlk->groups = new_groups;
	nlk->ngroups = groups;
 out_unlock:
	netlink_table_ungrab();
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 88 53.66% 1 50.00%
Johannes Berg 76 46.34% 1 50.00%
Total 164 100.00% 2 100.00%



static void netlink_undo_bind(int group, long unsigned int groups,
			      struct sock *sk)
{
	struct netlink_sock *nlk = nlk_sk(sk);
	int undo;

	if (!nlk->netlink_unbind)
		return;

	for (undo = 0; undo < group; undo++)
		if (test_bit(undo, &groups))
			nlk->netlink_unbind(sock_net(sk), undo + 1);
}

Contributors
Person Tokens Prop Commits CommitProp
Richard Guy Briggs 56 72.73% 1 20.00%
Johannes Berg 18 23.38% 2 40.00%
Pablo Neira Ayuso 2 2.60% 1 20.00%
Hiroaki SHIMODA 1 1.30% 1 20.00%
Total 77 100.00% 5 100.00%



static int netlink_bind(struct socket *sock, struct sockaddr *addr,
			int addr_len)
{
	struct sock *sk = sock->sk;
	struct net *net = sock_net(sk);
	struct netlink_sock *nlk = nlk_sk(sk);
	struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr;
	int err;
	long unsigned int groups = nladdr->nl_groups;
	bool bound;

	if (addr_len < sizeof(struct sockaddr_nl))
		return -EINVAL;

	if (nladdr->nl_family != AF_NETLINK)
		return -EINVAL;

	/* Only superuser is allowed to listen multicasts */
	if (groups) {
		if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV))
			return -EPERM;
		err = netlink_realloc_groups(sk);
		if (err)
			return err;
	}

	bound = nlk->bound;
	if (bound) {
		/* Ensure nlk->portid is up-to-date. */
		smp_rmb();

		if (nladdr->nl_pid != nlk->portid)
			return -EINVAL;
	}

	if (nlk->netlink_bind && groups) {
		int group;

		for (group = 0; group < nlk->ngroups; group++) {
			if (!test_bit(group, &groups))
				continue;
			err = nlk->netlink_bind(net, group + 1);
			if (!err)
				continue;
			netlink_undo_bind(group, groups, sk);
			return err;
		}
	}

	/* No need for barriers here as we return to user-space without
         * using any of the bound attributes.
         */
	if (!bound) {
		err = nladdr->nl_pid ?
			netlink_insert(sk, nladdr->nl_pid) :
			netlink_autobind(sock);
		if (err) {
			netlink_undo_bind(nlk->ngroups, groups, sk);
			return err;
		}
	}

	if (!groups && (nlk->groups == NULL || !(u32)nlk->groups[0]))
		return 0;

	netlink_table_grab();
	netlink_update_subscriptions(sk, nlk->subscriptions +
					 hweight32(groups) -
					 hweight32(nlk->groups[0]));
	nlk->groups[0] = (nlk->groups[0] & ~0xffffffffUL) | groups;
	netlink_update_listeners(sk);
	netlink_table_ungrab();

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 99 26.54% 3 13.04%
Richard Guy Briggs 94 25.20% 1 4.35%
Patrick McHardy 67 17.96% 3 13.04%
Herbert Xu 62 16.62% 3 13.04%
Hannes Frederic Sowa 14 3.75% 1 4.35%
David S. Miller 12 3.22% 1 4.35%
Eric W. Biedermann 9 2.41% 3 13.04%
Johannes Berg 7 1.88% 3 13.04%
Pablo Neira Ayuso 3 0.80% 2 8.70%
Hideaki Yoshifuji / 吉藤英明 3 0.80% 1 4.35%
James Morris 2 0.54% 1 4.35%
Arnaldo Carvalho de Melo 1 0.27% 1 4.35%
Total 373 100.00% 23 100.00%



static int netlink_connect(struct socket *sock, struct sockaddr *addr,
			   int alen, int flags)
{
	int err = 0;
	struct sock *sk = sock->sk;
	struct netlink_sock *nlk = nlk_sk(sk);
	struct sockaddr_nl *nladdr = (struct sockaddr_nl *)addr;

	if (alen < sizeof(addr->sa_family))
		return -EINVAL;

	if (addr->sa_family == AF_UNSPEC) {
		sk->sk_state	= NETLINK_UNCONNECTED;
		nlk->dst_portid	= 0;
		nlk->dst_group  = 0;
		return 0;
	}
	if (addr->sa_family != AF_NETLINK)
		return -EINVAL;

	if ((nladdr->nl_groups || nladdr->nl_pid) &&
	    !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND))
		return -EPERM;

	/* No need for barriers here as we return to user-space without
         * using any of the bound attributes.
         */
	if (!nlk->bound)
		err = netlink_autobind(sock);

	if (err == 0) {
		sk->sk_state	= NETLINK_CONNECTED;
		nlk->dst_portid = nladdr->nl_pid;
		nlk->dst_group  = ffs(nladdr->nl_groups);
	}

	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 129 67.54% 4 25.00%
Changli Gao 15 7.85% 1 6.25%
Herbert Xu 15 7.85% 3 18.75%
David S. Miller 14 7.33% 1 6.25%
Mike Pecovnik 6 3.14% 1 6.25%
Patrick McHardy 5 2.62% 1 6.25%
Eric W. Biedermann 3 1.57% 2 12.50%
James Morris 2 1.05% 1 6.25%
Arnaldo Carvalho de Melo 1 0.52% 1 6.25%
Pablo Neira Ayuso 1 0.52% 1 6.25%
Total 191 100.00% 16 100.00%



static int netlink_getname(struct socket *sock, struct sockaddr *addr,
			   int *addr_len, int peer)
{
	struct sock *sk = sock->sk;
	struct netlink_sock *nlk = nlk_sk(sk);
	DECLARE_SOCKADDR(struct sockaddr_nl *, nladdr, addr);

	nladdr->nl_family = AF_NETLINK;
	nladdr->nl_pad = 0;
	*addr_len = sizeof(*nladdr);

	if (peer) {
		nladdr->nl_pid = nlk->dst_portid;
		nladdr->nl_groups = netlink_group_mask(nlk->dst_group);
	} else {
		nladdr->nl_pid = nlk->portid;
		nladdr->nl_groups = nlk->groups ? nlk->groups[0] : 0;
	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 89 68.46% 2 20.00%
David S. Miller 18 13.85% 2 20.00%
Patrick McHardy 13 10.00% 3 30.00%
Cyrill V. Gorcunov 7 5.38% 1 10.00%
Eric W. Biedermann 2 1.54% 1 10.00%
Arnaldo Carvalho de Melo 1 0.77% 1 10.00%
Total 130 100.00% 10 100.00%



static int netlink_ioctl(struct socket *sock, unsigned int cmd,
			 unsigned long arg)
{
	/* try to hand this ioctl down to the NIC drivers.
         */
	return -ENOIOCTLCMD;
}

Contributors
Person Tokens Prop Commits CommitProp
David Decotigny 24 100.00% 1 100.00%
Total 24 100.00% 1 100.00%



static struct sock *netlink_getsockbyportid(struct sock *ssk, u32 portid)
{
	struct sock *sock;
	struct netlink_sock *nlk;

	sock = netlink_lookup(sock_net(ssk), ssk->sk_protocol, portid);
	if (!sock)
		return ERR_PTR(-ECONNREFUSED);

	/* Don't bother queuing skb if kernel socket has no input function */
	nlk = nlk_sk(sock);
	if (sock->sk_state == NETLINK_CONNECTED &&
	    nlk->dst_portid != nlk_sk(ssk)->portid) {
		sock_put(sock);
		return ERR_PTR(-ECONNREFUSED);
	}
	return sock;
}

Contributors
Person Tokens Prop Commits CommitProp
Andrew Morton 34 34.69% 1 7.69%
Linus Torvalds (pre-git) 21 21.43% 3 23.08%
Herbert Xu 14 14.29% 1 7.69%
David S. Miller 10 10.20% 1 7.69%
Eric W. Biedermann 7 7.14% 2 15.38%
Denis V. Lunev 4 4.08% 1 7.69%
Hideaki Yoshifuji / 吉藤英明 3 3.06% 1 7.69%
James Morris 3 3.06% 1 7.69%
Arnaldo Carvalho de Melo 1 1.02% 1 7.69%
Adrian Bunk 1 1.02% 1 7.69%
Total 98 100.00% 13 100.00%



struct sock *netlink_getsockbyfilp(struct file *filp)
{
	struct inode *inode = file_inode(filp);
	struct sock *sock;

	if (!S_ISSOCK(inode->i_mode))
		return ERR_PTR(-ENOTSOCK);

	sock = SOCKET_I(inode)->sk;
	if (sock->sk_family != AF_NETLINK)
		return ERR_PTR(-EINVAL);

	sock_hold(sock);
	return sock;
}

Contributors
Person Tokens Prop Commits CommitProp
Andrew Morton 56 73.68% 1 16.67%
Linus Torvalds (pre-git) 10 13.16% 3 50.00%
Matthew Wilcox 7 9.21% 1 16.67%
Al Viro 3 3.95% 1 16.67%
Total 76 100.00% 6 100.00%



static struct sk_buff *netlink_alloc_large_skb(unsigned int size,
					       int broadcast)
{
	struct sk_buff *skb;
	void *data;

	if (size <= NLMSG_GOODSIZE || broadcast)
		return alloc_skb(size, GFP_KERNEL);

	size = SKB_DATA_ALIGN(size) +
	       SKB_DATA_ALIGN(sizeof(struct skb_shared_info));

	data = vmalloc(size);
	if (data == NULL)
		return NULL;

	skb = __build_skb(data, size);
	if (skb == NULL)
		vfree(data);
	else
		skb->destructor = netlink_skb_destructor;

	return skb;
}

Contributors
Person Tokens Prop Commits CommitProp
Pablo Neira Ayuso 101 99.02% 2 66.67%
Eric Dumazet 1 0.98% 1 33.33%
Total 102 100.00% 3 100.00%

/*
 * Attach a skb to a netlink socket.
 * The caller must hold a reference to the destination socket. On error, the
 * reference is dropped. The skb is not send to the destination, just all
 * all error checks are performed and memory in the queue is reserved.
 * Return values:
 * < 0: error. skb freed, reference to sock dropped.
 * 0: continue
 * 1: repeat lookup - reference dropped while waiting for socket memory.
 */


int netlink_attachskb(struct sock *sk, struct sk_buff *skb,
		      long *timeo, struct sock *ssk)
{
	struct netlink_sock *nlk;

	nlk = nlk_sk(sk);

	if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf ||
	     test_bit(NETLINK_S_CONGESTED, &nlk->state))) {
		DECLARE_WAITQUEUE(wait, current);
		if (!*timeo) {
			if (!ssk || netlink_is_kernel(ssk))
				netlink_overrun(sk);
			sock_put(sk);
			kfree_skb(skb);
			return -EAGAIN;
		}

		__set_current_state(TASK_INTERRUPTIBLE);
		add_wait_queue(&nlk->wait, &wait);

		if ((atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf ||
		     test_bit(NETLINK_S_CONGESTED, &nlk->state)) &&
		    !sock_flag(sk, SOCK_DEAD))
			*timeo = schedule_timeout(*timeo);

		__set_current_state(TASK_RUNNING);
		remove_wait_queue(&nlk->wait, &wait);
		sock_put(sk);

		if (signal_pending(current)) {
			kfree_skb(skb);
			return sock_intr_errno(*timeo);
		}
		return 1;
	}
	netlink_skb_set_owner_r(skb, sk);
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 148 66.67% 7 36.84%
Andrew Morton 38 17.12% 1 5.26%
Alexey Kuznetsov 10 4.50% 1 5.26%
Arnaldo Carvalho de Melo 8 3.60% 3 15.79%
Patrick McHardy 8 3.60% 3 15.79%
David S. Miller 5 2.25% 1 5.26%
Nicolas Dichtel 2 0.90% 1 5.26%
James Morris 2 0.90% 1 5.26%
Denis V. Lunev 1 0.45% 1 5.26%
Total 222 100.00% 19 100.00%



static int __netlink_sendskb(struct sock *sk, struct sk_buff *skb)
{
	int len = skb->len;

	netlink_deliver_tap(skb);

	skb_queue_tail(&sk->sk_receive_queue, skb);
	sk->sk_data_ready(sk);
	return len;
}

Contributors
Person Tokens Prop Commits CommitProp
Andrew Morton 20 41.67% 1 20.00%
Linus Torvalds (pre-git) 15 31.25% 1 20.00%
Eric Dumazet 6 12.50% 1 20.00%
Daniel Borkmann 5 10.42% 1 20.00%
Arnaldo Carvalho de Melo 2 4.17% 1 20.00%
Total 48 100.00% 5 100.00%



int netlink_sendskb(struct sock *sk, struct sk_buff *skb)
{
	int len = __netlink_sendskb(sk, skb);

	sock_put(sk);
	return len;
}

Contributors
Person Tokens Prop Commits CommitProp
Eric Dumazet 24 72.73% 1 25.00%
Linus Torvalds (pre-git) 8 24.24% 2 50.00%
Andrew Morton 1 3.03% 1 25.00%
Total 33 100.00% 4 100.00%



void netlink_detachskb(struct sock *sk, struct sk_buff *skb)
{
	kfree_skb(skb);
	sock_put(sk);
}

Contributors
Person Tokens Prop Commits CommitProp
Andrew Morton 25 100.00% 1 100.00%
Total 25 100.00% 1 100.00%



static struct sk_buff *netlink_trim(struct sk_buff *skb, gfp_t allocation)
{
	int delta;

	WARN_ON(skb->sk != NULL);
	delta = skb->end - skb->tail;
	if (is_vmalloc_addr(skb->head) || delta * 2 < skb->truesize)
		return skb;

	if (skb_shared(skb)) {
		struct sk_buff *nskb = skb_clone(skb, allocation);
		if (!nskb)
			return skb;
		consume_skb(skb);
		skb = nskb;
	}

	pskb_expand_head(skb, 0, -delta,
			 (allocation & ~__GFP_DIRECT_RECLAIM) |
			 __GFP_NOWARN | __GFP_NORETRY);
	return skb;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 94 78.33% 3 30.00%
Eric Dumazet 10 8.33% 2 20.00%
Pablo Neira Ayuso 7 5.83% 1 10.00%
Patrick McHardy 5 4.17% 1 10.00%
Arnaldo Carvalho de Melo 2 1.67% 1 10.00%
David S. Miller 1 0.83% 1 10.00%
Al Viro 1 0.83% 1 10.00%
Total 120 100.00% 10 100.00%



static int netlink_unicast_kernel(struct sock *sk, struct sk_buff *skb,
				  struct sock *ssk)
{
	int ret;
	struct netlink_sock *nlk = nlk_sk(sk);

	ret = -ECONNREFUSED;
	if (nlk->netlink_rcv != NULL) {
		ret = skb->len;
		netlink_skb_set_owner_r(skb, sk);
		NETLINK_CB(skb).sk = ssk;
		netlink_deliver_tap_kernel(sk, ssk, skb);
		nlk->netlink_rcv(skb);
		consume_skb(skb);
	} else {
		kfree_skb(skb);
	}
	sock_put(sk);
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 45 41.67% 1 20.00%
Denis V. Lunev 37 34.26% 1 20.00%
Florian Westphal 16 14.81% 1 20.00%
Eric Dumazet 5 4.63% 1 20.00%
Eric W. Biedermann 5 4.63% 1 20.00%
Total 108 100.00% 5 100.00%



int netlink_unicast(struct sock *ssk, struct sk_buff *skb,
		    u32 portid, int nonblock)
{
	struct sock *sk;
	int err;
	long timeo;

	skb = netlink_trim(skb, gfp_any());

	timeo = sock_sndtimeo(ssk, nonblock);
retry:
	sk = netlink_getsockbyportid(ssk, portid);
	if (IS_ERR(sk)) {
		kfree_skb(skb);
		return PTR_ERR(sk);
	}
	if (netlink_is_kernel(sk))
		return netlink_unicast_kernel(sk, skb, ssk);

	if (sk_filter(sk, skb)) {
		err = skb->len;
		kfree_skb(skb);
		sock_put(sk);
		return err;
	}

	err = netlink_attachskb(sk, skb, &timeo, ssk);
	if (err == 1)
		goto retry;
	if (err)
		return err;

	return netlink_sendskb(sk, skb);
}
Contributors
Person Tokens Prop Commits CommitProp
Florian Westphal 94 56.29% 1 11.11%
Andrew Morton 28 16.77% 1 11.11%
Patrick McHardy 26 15.57% 2 22.22%
Stephen Hemminger 11 6.59% 1 11.11%
Herbert Xu 3 1.80% 2 22.22%
Denis V. Lunev 3 1.80% 1 11.11%
Daniel Borkmann 2 1.20% 1 11.11%
Total 167 100.00% 9 100.00%


EXPORT_SYMBOL(netlink_unicast);



int netlink_has_listeners(struct sock *sk, unsigned int group)
{
	int res = 0;
	struct listeners *listeners;

	BUG_ON(!netlink_is_kernel(sk));

	rcu_read_lock();
	listeners = rcu_dereference(nl_table[sk->sk_protocol].listeners);

	if (listeners && group - 1 < nl_table[sk->sk_protocol].groups)
		res = test_bit(group - 1, listeners->masks);

	rcu_read_unlock();

	return res;
}
Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 56 65.12% 1 20.00%
Johannes Berg 23 26.74% 1 20.00%
Eric Dumazet 6 6.98% 2 40.00%
Denis V. Lunev 1 1.16% 1 20.00%
Total 86 100.00% 5 100.00%


EXPORT_SYMBOL_GPL(netlink_has_listeners);



static int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb)
{
	struct netlink_sock *nlk = nlk_sk(sk);

	if (atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf &&
	    !test_bit(NETLINK_S_CONGESTED, &nlk->state)) {
		netlink_skb_set_owner_r(skb, sk);
		__netlink_sendskb(sk, skb);
		return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1);
	}
	return -1;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 57 64.77% 2 20.00%
Herbert Xu 11 12.50% 1 10.00%
David S. Miller 10 11.36% 1 10.00%
Stephen Hemminger 4 4.55% 1 10.00%
Arnaldo Carvalho de Melo 3 3.41% 2 20.00%
Patrick McHardy 1 1.14% 1 10.00%
Nicolas Dichtel 1 1.14% 1 10.00%
Eric Dumazet 1 1.14% 1 10.00%
Total 88 100.00% 10 100.00%


struct netlink_broadcast_data {
	
struct sock *exclude_sk;
	
struct net *net;
	
u32 portid;
	
u32 group;
	
int failure;
	
int delivery_failure;
	
int congested;
	
int delivered;
	
gfp_t allocation;
	

struct sk_buff *skb, *skb2;
	
int (*tx_filter)(struct sock *dsk, struct sk_buff *skb, void *data);
	
void *tx_data;
};



static void do_one_broadcast(struct sock *sk,
				    struct netlink_broadcast_data *p)
{
	struct netlink_sock *nlk = nlk_sk(sk);
	int val;

	if (p->exclude_sk == sk)
		return;

	if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups ||
	    !test_bit(p->group - 1, nlk->groups))
		return;

	if (!net_eq(sock_net(sk), p->net)) {
		if (!(nlk->flags & NETLINK_F_LISTEN_ALL_NSID))
			return;

		if (!peernet_has_id(sock_net(sk), p->net))
			return;

		if (!file_ns_capable(sk->sk_socket->file, p->net->user_ns,
				     CAP_NET_BROADCAST))
			return;
	}

	if (p->failure) {
		netlink_overrun(sk);
		return;
	}

	sock_hold(sk);
	if (p->skb2 == NULL) {
		if (skb_shared(p->skb)) {
			p->skb2 = skb_clone(p->skb, p->allocation);
		} else {
			p->skb2 = skb_get(p->skb);
			/*
                         * skb ownership may have been set when
                         * delivered to a previous socket.
                         */
			skb_orphan(p->skb2);
		}
	}
	if (p->skb2 == NULL) {
		netlink_overrun(sk);
		/* Clone failed. Notify ALL listeners. */
		p->failure = 1;
		if (nlk->flags & NETLINK_F_BROADCAST_SEND_ERROR)
			p->delivery_failure = 1;
		goto out;
	}
	if (p->tx_filter && p->tx_filter(sk, p->skb2, p->tx_data)) {
		kfree_skb(p->skb2);
		p->skb2 = NULL;
		goto out;
	}
	if (sk_filter(sk, p->skb2)) {
		kfree_skb(p->skb2);
		p->skb2 = NULL;
		goto out;
	}
	NETLINK_CB(p->skb2).nsid = peernet2id(sock_net(sk), p->net);
	NETLINK_CB(p->skb2).nsid_is_set = true;
	val = netlink_broadcast_deliver(sk, p->skb2);
	if (val < 0) {
		netlink_overrun(sk);
		if (nlk->flags & NETLINK_F_BROADCAST_SEND_ERROR)
			p->delivery_failure = 1;
	} else {
		p->congested |= val;
		p->delivered = 1;
		p->skb2 = NULL;
	}
out:
	sock_put(sk);
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 105 24.94% 2 9.09%
Nicolas Dichtel 99 23.52% 2 9.09%
Herbert Xu 61 14.49% 2 9.09%
Eric W. Biedermann 45 10.69% 3 13.64%
Pablo Neira Ayuso 26 6.18% 2 9.09%
Stephen Hemminger 24 5.70% 1 4.55%
David S. Miller 22 5.23% 3 13.64%
Patrick McHardy 18 4.28% 2 9.09%
Hideaki Yoshifuji / 吉藤英明 8 1.90% 2 9.09%
Tommy S. Christensen 7 1.66% 1 4.55%
Rami Rosen 5 1.19% 1 4.55%
Arnaldo Carvalho de Melo 1 0.24% 1 4.55%
Total 421 100.00% 22 100.00%



int netlink_broadcast_filtered(struct sock *ssk, struct sk_buff *skb, u32 portid,
	u32 group, gfp_t allocation,
	int (*filter)(struct sock *dsk, struct sk_buff *skb, void *data),
	void *filter_data)
{
	struct net *net = sock_net(ssk);
	struct netlink_broadcast_data info;
	struct sock *sk;

	skb = netlink_trim(skb, allocation);

	info.exclude_sk = ssk;
	info.net = net;
	info.portid = portid;
	info.group = group;
	info.failure = 0;
	info.delivery_failure = 0;
	info.congested = 0;
	info.delivered = 0;
	info.allocation = allocation;
	info.skb = skb;
	info.skb2 = NULL;
	info.tx_filter = filter;
	info.tx_data = filter_data;

	/* While we sleep in clone, do not allow to change socket list */

	netlink_lock_table();

	sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list)
		do_one_broadcast(sk, &info);

	consume_skb(skb);

	netlink_unlock_table();

	if (info.delivery_failure) {
		kfree_skb(info.skb2);
		return -ENOBUFS;
	}
	consume_skb(info.skb2);

	if (info.delivered) {
		if (info.congested && gfpflags_allow_blocking(allocation))
			yield();
		return 0;
	}
	return -ESRCH;
}
Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 128 54.24% 3 18.75%
Eric W. Biedermann 54 22.88% 3 18.75%
Neil Horman 16 6.78% 1 6.25%
Pablo Neira Ayuso 14 5.93% 1 6.25%
Linus Torvalds (pre-git) 8 3.39% 3 18.75%
David S. Miller 5 2.12% 1 6.25%
Tommy S. Christensen 4 1.69% 1 6.25%
Mel Gorman 3 1.27% 1 6.25%
Hideaki Yoshifuji / 吉藤英明 3 1.27% 1 6.25%
Al Viro 1 0.42% 1 6.25%
Total 236 100.00% 16 100.00%


EXPORT_SYMBOL(netlink_broadcast_filtered);



int netlink_broadcast(struct sock *ssk, struct sk_buff *skb, u32 portid,
		      u32 group, gfp_t allocation)
{
	return netlink_broadcast_filtered(ssk, skb, portid, group, allocation,
		NULL, NULL);
}
Contributors
Person Tokens Prop Commits CommitProp
Eric W. Biedermann 42 100.00% 2 100.00%
Total 42 100.00% 2 100.00%


EXPORT_SYMBOL(netlink_broadcast);


struct netlink_set_err_data {
	
struct sock *exclude_sk;
	
u32 portid;
	
u32 group;
	
int code;
};



static int do_one_set_err(struct sock *sk, struct netlink_set_err_data *p)
{
	struct netlink_sock *nlk = nlk_sk(sk);
	int ret = 0;

	if (sk == p->exclude_sk)
		goto out;

	if (!net_eq(sock_net(sk), sock_net(p->exclude_sk)))
		goto out;

	if (nlk->portid == p->portid || p->group - 1 >= nlk->ngroups ||
	    !test_bit(p->group - 1, nlk->groups))
		goto out;

	if (p->code == ENOBUFS && nlk->flags & NETLINK_F_RECV_NO_ENOBUFS) {
		ret = 1;
		goto out;
	}

	sk->sk_err = p->code;
	sk->sk_error_report(sk);
out:
	return ret;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 72 50.35% 1 10.00%
Pablo Neira Ayuso 28 19.58% 1 10.00%
Patrick McHardy 18 12.59% 2 20.00%
Eric W. Biedermann 12 8.39% 2 20.00%
Hideaki Yoshifuji / 吉藤英明 6 4.20% 1 10.00%
Octavian Purdila 5 3.50% 1 10.00%
Nicolas Dichtel 1 0.70% 1 10.00%
Arnaldo Carvalho de Melo 1 0.70% 1 10.00%
Total 143 100.00% 10 100.00%

/**
 * netlink_set_err - report error to broadcast listeners
 * @ssk: the kernel netlink socket, as returned by netlink_kernel_create()
 * @portid: the PORTID of a process that we want to skip (if any)
 * @group: the broadcast group that will notice the error
 * @code: error code, must be negative (as usual in kernelspace)
 *
 * This function returns the number of broadcast listeners that have set the
 * NETLINK_NO_ENOBUFS socket option.
 */


int netlink_set_err(struct sock *ssk, u32 portid, u32 group, int code)
{
	struct netlink_set_err_data info;
	struct sock *sk;
	int ret = 0;

	info.exclude_sk = ssk;
	info.portid = portid;
	info.group = group;
	/* sk->sk_err wants a positive error value */
	info.code = -code;

	read_lock(&nl_table_lock);

	sk_for_each_bound(sk, &nl_table[ssk->sk_protocol].mc_list)
		ret += do_one_set_err(sk, &info);

	read_unlock(&nl_table_lock);
	return ret;
}
Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 35 38.89% 3 33.33%
Herbert Xu 32 35.56% 1 11.11%
Pablo Neira Ayuso 13 14.44% 2 22.22%
Arnaldo Carvalho de Melo 5 5.56% 1 11.11%
Eric W. Biedermann 3 3.33% 1 11.11%
David S. Miller 2 2.22% 1 11.11%
Total 90 100.00% 9 100.00%


EXPORT_SYMBOL(netlink_set_err);

/* must be called with netlink table grabbed */


static void netlink_update_socket_mc(struct netlink_sock *nlk,
				     unsigned int group,
				     int is_new)
{
	int old, new = !!is_new, subscriptions;

	old = test_bit(group - 1, nlk->groups);
	subscriptions = nlk->subscriptions - old + new;
	if (new)
		__set_bit(group - 1, nlk->groups);
	else
		__clear_bit(group - 1, nlk->groups);
	netlink_update_subscriptions(&nlk->sk, subscriptions);
	netlink_update_listeners(&nlk->sk);
}

Contributors
Person Tokens Prop Commits CommitProp
Johannes Berg 97 100.00% 1 100.00%
Total 97 100.00% 1 100.00%



static int netlink_setsockopt(struct socket *sock, int level, int optname,
			      char __user *optval, unsigned int optlen)
{
	struct sock *sk = sock->sk;
	struct netlink_sock *nlk = nlk_sk(sk);
	unsigned int val = 0;
	int err;

	if (level != SOL_NETLINK)
		return -ENOPROTOOPT;

	if (optlen >= sizeof(int) &&
	    get_user(val, (unsigned int __user *)optval))
		return -EFAULT;

	switch (optname) {
	case NETLINK_PKTINFO:
		if (val)
			nlk->flags |= NETLINK_F_RECV_PKTINFO;
		else
			nlk->flags &= ~NETLINK_F_RECV_PKTINFO;
		err = 0;
		break;
	case NETLINK_ADD_MEMBERSHIP:
	case NETLINK_DROP_MEMBERSHIP: {
		if (!netlink_allowed(sock, NL_CFG_F_NONROOT_RECV))
			return -EPERM;
		err = netlink_realloc_groups(sk);
		if (err)
			return err;
		if (!val || val - 1 >= nlk->ngroups)
			return -EINVAL;
		if (optname == NETLINK_ADD_MEMBERSHIP && nlk->netlink_bind) {
			err = nlk->netlink_bind(sock_net(sk), val);
			if (err)
				return err;
		}
		netlink_table_grab();
		netlink_update_socket_mc(nlk, val,
					 optname == NETLINK_ADD_MEMBERSHIP);
		netlink_table_ungrab();
		if (optname == NETLINK_DROP_MEMBERSHIP && nlk->netlink_unbind)
			nlk->netlink_unbind(sock_net(sk), val);

		err = 0;
		break;
	}
	case NETLINK_BROADCAST_ERROR:
		if (val)
			nlk->flags |= NETLINK_F_BROADCAST_SEND_ERROR;
		else
			nlk->flags &= ~NETLINK_F_BROADCAST_SEND_ERROR;
		err = 0;
		break;
	case NETLINK_NO_ENOBUFS:
		if (val) {
			nlk->flags |= NETLINK_F_RECV_NO_ENOBUFS;
			clear_bit(NETLINK_S_CONGESTED, &nlk->state);
			wake_up_interruptible(&nlk->wait);
		} else {
			nlk->flags &= ~NETLINK_F_RECV_NO_ENOBUFS;
		}
		err = 0;
		break;
	case NETLINK_LISTEN_ALL_NSID:
		if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_BROADCAST))
			return -EPERM;

		if (val)
			nlk->flags |= NETLINK_F_LISTEN_ALL_NSID;
		else
			nlk->flags &= ~NETLINK_F_LISTEN_ALL_NSID;
		err = 0;
		break;
	case NETLINK_CAP_ACK:
		if (val)
			nlk->flags |= NETLINK_F_CAP_ACK;
		else
			nlk->flags &= ~NETLINK_F_CAP_ACK;
		err = 0;
		break;
	default:
		err = -ENOPROTOOPT;
	}
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 192 47.29% 3 16.67%
Pablo Neira Ayuso 68 16.75% 3 16.67%
Nicolas Dichtel 52 12.81% 2 11.11%
Richard Guy Briggs 45 11.08% 2 11.11%
Christophe Ricard 26 6.40% 1 5.56%
Johannes Berg 19 4.68% 4 22.22%
Eric Dumazet 2 0.49% 1 5.56%
David S. Miller 1 0.25% 1 5.56%
Eric W. Biedermann 1 0.25% 1 5.56%
Total 406 100.00% 18 100.00%



static int netlink_getsockopt(struct socket *sock, int level, int optname,
			      char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
	struct netlink_sock *nlk = nlk_sk(sk);
	int len, val, err;

	if (level != SOL_NETLINK)
		return -ENOPROTOOPT;

	if (get_user(len, optlen))
		return -EFAULT;
	if (len < 0)
		return -EINVAL;

	switch (optname) {
	case NETLINK_PKTINFO:
		if (len < sizeof(int))
			return -EINVAL;
		len = sizeof(int);
		val = nlk->flags & NETLINK_F_RECV_PKTINFO ? 1 : 0;
		if (put_user(len, optlen) ||
		    put_user(val, optval))
			return -EFAULT;
		err = 0;
		break;
	case NETLINK_BROADCAST_ERROR:
		if (len < sizeof(int))
			return -EINVAL;
		len = sizeof(int);
		val = nlk->flags & NETLINK_F_BROADCAST_SEND_ERROR ? 1 : 0;
		if (put_user(len, optlen) ||
		    put_user(val, optval))
			return -EFAULT;
		err = 0;
		break;
	case NETLINK_NO_ENOBUFS:
		if (len < sizeof(int))
			return -EINVAL;
		len = sizeof(int);
		val = nlk->flags & NETLINK_F_RECV_NO_ENOBUFS ? 1 : 0;
		if (put_user(len, optlen) ||
		    put_user(val, optval))
			return -EFAULT;
		err = 0;
		break;
	case NETLINK_LIST_MEMBERSHIPS: {
		int pos, idx, shift;

		err = 0;
		netlink_lock_table();
		for (pos = 0; pos * 8 < nlk->ngroups; pos += sizeof(u32)) {
			if (len - pos < sizeof(u32))
				break;

			idx = pos / sizeof(unsigned long);
			shift = (pos % sizeof(unsigned long)) * 8;
			if (put_user((u32)(nlk->groups[idx] >> shift),
				     (u32 __user *)(optval + pos))) {
				err = -EFAULT;
				break;
			}
		}
		if (put_user(ALIGN(nlk->ngroups / 8, sizeof(u32)), optlen))
			err = -EFAULT;
		netlink_unlock_table();
		break;
	}
	case NETLINK_CAP_ACK:
		if (len < sizeof(int))
			return -EINVAL;
		len = sizeof(int);
		val = nlk->flags & NETLINK_F_CAP_ACK ? 1 : 0;
		if (put_user(len, optlen) ||
		    put_user(val, optval))
			return -EFAULT;
		err = 0;
		break;
	default:
		err = -ENOPROTOOPT;
	}
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 152 31.21% 1 12.50%
David Herrmann 146 29.98% 2 25.00%
Pablo Neira Ayuso 118 24.23% 2 25.00%
Christophe Ricard 60 12.32% 1 12.50%
Heiko Carstens 8 1.64% 1 12.50%
Nicolas Dichtel 3 0.62% 1 12.50%
Total 487 100.00% 8 100.00%



static void netlink_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
{
	struct nl_pktinfo info;

	info.group = NETLINK_CB(skb).dst_group;
	put_cmsg(msg, SOL_NETLINK, NETLINK_PKTINFO, sizeof(info), &info);
}

Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 48 100.00% 1 100.00%
Total 48 100.00% 1 100.00%



static void netlink_cmsg_listen_all_nsid(struct sock *sk, struct msghdr *msg,
					 struct sk_buff *skb)
{
	if (!NETLINK_CB(skb).nsid_is_set)
		return;

	put_cmsg(msg, SOL_NETLINK, NETLINK_LISTEN_ALL_NSID, sizeof(int),
		 &NETLINK_CB(skb).nsid);
}

Contributors
Person Tokens Prop Commits CommitProp
Nicolas Dichtel 54 100.00% 1 100.00%
Total 54 100.00% 1 100.00%



static int netlink_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
{
	struct sock *sk = sock->sk;
	struct netlink_sock *nlk = nlk_sk(sk);
	DECLARE_SOCKADDR(struct sockaddr_nl *, addr, msg->msg_name);
	u32 dst_portid;
	u32 dst_group;
	struct sk_buff *skb;
	int err;
	struct scm_cookie scm;
	u32 netlink_skb_flags = 0;

	if (msg->msg_flags&MSG_OOB)
		return -EOPNOTSUPP;

	err = scm_send(sock, msg, &scm, true);
	if (err < 0)
		return err;

	if (msg->msg_namelen) {
		err = -EINVAL;
		if (addr->nl_family != AF_NETLINK)
			goto out;
		dst_portid = addr->nl_pid;
		dst_group = ffs(addr->nl_groups);
		err =  -EPERM;
		if ((dst_group || dst_portid) &&
		    !netlink_allowed(sock, NL_CFG_F_NONROOT_SEND))
			goto out;
		netlink_skb_flags |= NETLINK_SKB_DST;
	} else {
		dst_portid = nlk->dst_portid;
		dst_group = nlk->dst_group;
	}

	if (!nlk->bound) {
		err = netlink_autobind(sock);
		if (err)
			goto out;
	} else {
		/* Ensure nlk is hashed and visible. */
		smp_rmb();
	}

	err = -EMSGSIZE;
	if (len > sk->sk_sndbuf - 32)
		goto out;
	err = -ENOBUFS;
	skb = netlink_alloc_large_skb(len, dst_group);
	if (skb == NULL)
		goto out;

	NETLINK_CB(skb).portid	= nlk->portid;
	NETLINK_CB(skb).dst_group = dst_group;
	NETLINK_CB(skb).creds	= scm.creds;
	NETLINK_CB(skb).flags	= netlink_skb_flags;

	err = -EFAULT;
	if (memcpy_from_msg(skb_put(skb, len), msg, len)) {
		kfree_skb(skb);
		goto out;
	}

	err = security_netlink_send(sk, skb);
	if (err) {
		kfree_skb(skb);
		goto out;
	}

	if (dst_group) {
		atomic_inc(&skb->users);
		netlink_broadcast(sk, skb, dst_portid, dst_group, GFP_KERNEL);
	}
	err = netlink_unicast(sk, skb, dst_portid, msg->msg_flags&MSG_DONTWAIT);

out:
	scm_destroy(&scm);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 249 60.58% 4 14.29%
Eric W. Biedermann 53 12.90% 5 17.86%
James Morris 27 6.57% 4 14.29%
Benjamin LaHaise 26 6.33% 1 3.57%
Patrick McHardy 12 2.92% 1 3.57%
David S. Miller 12 2.92% 1 3.57%
Steffen Hurrle 8 1.95% 1 3.57%
Herbert Xu 8 1.95% 1 3.57%
Pablo Neira Ayuso 7 1.70% 4 14.29%
Christoph Hellwig 3 0.73% 1 3.57%
Arnaldo Carvalho de Melo 2 0.49% 2 7.14%
Eric Dumazet 2 0.49% 1 3.57%
Al Viro 1 0.24% 1 3.57%
Stephen Hemminger 1 0.24% 1 3.57%
Total 411 100.00% 28 100.00%



static int netlink_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
			   int flags)
{
	struct scm_cookie scm;
	struct sock *sk = sock->sk;
	struct netlink_sock *nlk = nlk_sk(sk);
	int noblock = flags&MSG_DONTWAIT;
	size_t copied;
	struct sk_buff *skb, *data_skb;
	int err, ret;

	if (flags&MSG_OOB)
		return -EOPNOTSUPP;

	copied = 0;

	skb = skb_recv_datagram(sk, flags, noblock, &err);
	if (skb == NULL)
		goto out;

	data_skb = skb;

#ifdef CONFIG_COMPAT_NETLINK_MESSAGES
	if (unlikely(skb_shinfo(skb)->frag_list)) {
		/*
                 * If this skb has a frag_list, then here that means that we
                 * will have to use the frag_list skb's data for compat tasks
                 * and the regular skb's data for normal (non-compat) tasks.
                 *
                 * If we need to send the compat skb, assign it to the
                 * 'data_skb' variable so that it will be used below for data
                 * copying. We keep 'skb' for everything else, including
                 * freeing both later.
                 */
		if (flags & MSG_CMSG_COMPAT)
			data_skb = skb_shinfo(skb)->frag_list;
	}
#endif

	/* Record the max length of recvmsg() calls for future allocations */
	nlk->max_recvmsg_len = max(nlk->max_recvmsg_len, len);
	nlk->max_recvmsg_len = min_t(size_t, nlk->max_recvmsg_len,
				     SKB_WITH_OVERHEAD(32768));

	copied = data_skb->len;
	if (len < copied) {
		msg->msg_flags |= MSG_TRUNC;
		copied = len;
	}

	skb_reset_transport_header(data_skb);
	err = skb_copy_datagram_msg(data_skb, 0, msg, copied);

	if (msg->msg_name) {
		DECLARE_SOCKADDR(struct sockaddr_nl *, addr, msg->msg_name);
		addr->nl_family = AF_NETLINK;
		addr->nl_pad    = 0;
		addr->nl_pid	= NETLINK_CB(skb).portid;
		addr->nl_groups	= netlink_group_mask(NETLINK_CB(skb).dst_group);
		msg->msg_namelen = sizeof(*addr);
	}

	if (nlk->flags & NETLINK_F_RECV_PKTINFO)
		netlink_cmsg_recv_pktinfo(msg, skb);
	if (nlk->flags & NETLINK_F_LISTEN_ALL_NSID)
		netlink_cmsg_listen_all_nsid(sk, msg, skb);

	memset(&scm, 0, sizeof(scm));
	scm.creds = *NETLINK_CREDS(skb);
	if (flags & MSG_TRUNC)
		copied = data_skb->len;

	skb_free_datagram(sk, skb);

	if (nlk->cb_running &&
	    atomic_read(&sk->sk_rmem_alloc) <= sk->sk_rcvbuf / 2) {
		ret = netlink_dump(sk);
		if (ret) {
			sk->sk_err = -ret;
			sk->sk_error_report(sk);
		}
	}

	scm_recv(sock, msg, &scm, flags);
out:
	netlink_rcv_wake(sk);
	return err ? : copied;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 217 50.00% 2 7.41%
Johannes Berg 44 10.14% 2 7.41%
Eric Dumazet 32 7.37% 2 7.41%
Benjamin LaHaise 31 7.14% 1 3.70%
Patrick McHardy 27 6.22% 3 11.11%
Andrey Vagin 25 5.76% 1 3.70%
David S. Miller 19 4.38% 4 14.81%
Nicolas Dichtel 18 4.15% 2 7.41%
Steffen Hurrle 7 1.61% 1 3.70%
Arnaldo Carvalho de Melo 6 1.38% 3 11.11%
Stephen Hemminger 2 0.46% 1 3.70%
Christoph Hellwig 2 0.46% 1 3.70%
Eric W. Biedermann 1 0.23% 1 3.70%
James Morris 1 0.23% 1 3.70%
Ben Pfaff 1 0.23% 1 3.70%
Pravin B Shelar 1 0.23% 1 3.70%
Total 434 100.00% 27 100.00%



static void netlink_data_ready(struct sock *sk)
{
	BUG();
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 11 78.57% 2 50.00%
Denis V. Lunev 2 14.29% 1 25.00%
Stephen Hemminger 1 7.14% 1 25.00%
Total 14 100.00% 4 100.00%

/*
 *      We export these functions to other modules. They provide a
 *      complete set of kernel non-blocking support for message
 *      queueing.
 */


struct sock *

__netlink_kernel_create(struct net *net, int unit, struct module *module,
			struct netlink_kernel_cfg *cfg)
{
	struct socket *sock;
	struct sock *sk;
	struct netlink_sock *nlk;
	struct listeners *listeners = NULL;
	struct mutex *cb_mutex = cfg ? cfg->cb_mutex : NULL;
	unsigned int groups;

	BUG_ON(!nl_table);

	if (unit < 0 || unit >= MAX_LINKS)
		return NULL;

	if (sock_create_lite(PF_NETLINK, SOCK_DGRAM, unit, &sock))
		return NULL;

	if (__netlink_create(net, sock, cb_mutex, unit, 1) < 0)
		goto out_sock_release_nosk;

	sk = sock->sk;

	if (!cfg || cfg->groups < 32)
		groups = 32;
	else
		groups = cfg->groups;

	listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL);
	if (!listeners)
		goto out_sock_release;

	sk->sk_data_ready = netlink_data_ready;
	if (cfg && cfg->input)
		nlk_sk(sk)->netlink_rcv = cfg->input;

	if (netlink_insert(sk, 0))
		goto out_sock_release;

	nlk = nlk_sk(sk);
	nlk->flags |= NETLINK_F_KERNEL_SOCKET;

	netlink_table_grab();
	if (!nl_table[unit].registered) {
		nl_table[unit].groups = groups;
		rcu_assign_pointer(nl_table[unit].listeners, listeners);
		nl_table[unit].cb_mutex = cb_mutex;
		nl_table[unit].module = module;
		if (cfg) {
			nl_table[unit].bind = cfg->bind;
			nl_table[unit].unbind = cfg->unbind;
			nl_table[unit].flags = cfg->flags;
			if (cfg->compare)
				nl_table[unit].compare = cfg->compare;
		}
		nl_table[unit].registered = 1;
	} else {
		kfree(listeners);
		nl_table[unit].registered++;
	}
	netlink_table_ungrab();
	return sk;

out_sock_release:
	kfree(listeners);
	netlink_kernel_release(sk);
	return NULL;

out_sock_release_nosk:
	sock_release(sock);
	return NULL;
}
Contributors
Person Tokens Prop Commits CommitProp
Patrick McHardy 102 26.15% 6 18.18%
Linus Torvalds (pre-git) 72 18.46% 2 6.06%
Pablo Neira Ayuso 68 17.44% 4 12.12%
Harald Welte 21 5.38% 1 3.03%
Eric W. Biedermann 21 5.38% 4 12.12%
Gao Feng 17 4.36% 1 3.03%
Pavel Emelyanov 16 4.10% 1 3.03%
Hiroaki SHIMODA 11 2.82% 1 3.03%
Eric Dumazet 11 2.82% 1 3.03%
Herbert Xu 11 2.82% 2 6.06%
Denis V. Lunev 10 2.56% 3 9.09%
James Morris 10 2.56% 1 3.03%
Jesper Juhl 8 2.05% 1 3.03%
Akinobu Mita 4 1.03% 1 3.03%
Johannes Berg 3 0.77% 1 3.03%
David S. Miller 3 0.77% 1 3.03%
Arnaldo Carvalho de Melo 1 0.26% 1 3.03%
Nicolas Dichtel 1 0.26% 1 3.03%
Total 390 100.00% 33 100.00%


EXPORT_SYMBOL(__netlink_kernel_create);


void

netlink_kernel_release(struct sock *sk)
{
	if (sk == NULL || sk->sk_socket == NULL)
		return;

	sock_release(sk->sk_socket);
}
Contributors
Person Tokens Prop Commits CommitProp
Eric W. Biedermann 16 53.33% 1 33.33%
Denis V. Lunev 14 46.67% 2 66.67%
Total 30 100.00% 3 100.00%


EXPORT_SYMBOL(netlink_kernel_release);



int __netlink_change_ngroups(struct sock *sk, unsigned int groups)
{
	struct listeners *new, *old;
	struct netlink_table *tbl = &nl_table[sk->sk_protocol];

	if (groups < 32)
		groups = 32;

	if (NLGRPSZ(tbl->groups) < NLGRPSZ(groups)) {
		new = kzalloc(sizeof(*new) + NLGRPSZ(groups), GFP_ATOMIC);
		if (!new)
			return -ENOMEM;
		old = nl_deref_protected(tbl->listeners);
		memcpy(new->masks, old->masks, NLGRPSZ(tbl->groups));
		rcu_assign_pointer(tbl->listeners, new);

		kfree_rcu(old, rcu);
	}
	tbl->groups = groups;

	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Johannes Berg 118 84.29% 3 50.00%
Eric Dumazet 20 14.29% 2 33.33%
Lai Jiangshan 2 1.43% 1 16.67%
Total 140 100.00% 6 100.00%

/**
 * netlink_change_ngroups - change number of multicast groups
 *
 * This changes the number of multicast groups that are available
 * on a certain netlink family. Note that it is not possible to
 * change the number of groups to below 32. Also note that it does
 * not implicitly call netlink_clear_multicast_users() when the
 * number of groups is reduced.
 *
 * @sk: The kernel netlink socket, as returned by netlink_kernel_create().
 * @groups: The new number of groups.
 */


int netlink_change_ngroups(struct sock *sk, unsigned int groups)
{
	int err;

	netlink_table_grab();
	err = __netlink_change_ngroups(sk, groups);
	netlink_table_ungrab();

	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Johannes Berg 35 100.00% 2 100.00%
Total 35 100.00% 2 100.00%



void __netlink_clear_multicast_users(struct sock *ksk, unsigned int group)
{
	struct sock *sk;
	struct netlink_table *tbl = &nl_table[ksk->sk_protocol];

	sk_for_each_bound(sk, &tbl->mc_list)
		netlink_update_socket_mc(nlk_sk(sk), group, 0);
}

Contributors
Person Tokens Prop Commits CommitProp
Johannes Berg 50 100.00% 2 100.00%
Total 50 100.00% 2 100.00%


struct nlmsghdr *

__nlmsg_put(struct sk_buff *skb, u32 portid, u32 seq, int type, int len, int flags)
{
	struct nlmsghdr *nlh;
	int size = nlmsg_msg_size(len);

	nlh = (struct nlmsghdr *)skb_put(skb, NLMSG_ALIGN(size));
	nlh->nlmsg_type = type;
	nlh->nlmsg_len = size;
	nlh->nlmsg_flags = flags;
	nlh->nlmsg_pid = portid;
	nlh->nlmsg_seq = seq;
	if (!__builtin_constant_p(size) || NLMSG_ALIGN(size) - size != 0)
		memset(nlmsg_data(nlh) + len, 0, NLMSG_ALIGN(size) - size);
	return nlh;
}
Contributors
Person Tokens Prop Commits CommitProp
Denys Vlasenko 122 96.83% 1 33.33%
Eric W. Biedermann 2 1.59% 1 33.33%
Hong Zhi Guo 2 1.59% 1 33.33%
Total 126 100.00% 3 100.00%


EXPORT_SYMBOL(__nlmsg_put);

/*
 * It looks a bit ugly.
 * It would be better to create kernel thread.
 */



static int netlink_dump(struct sock *sk)
{
	struct netlink_sock *nlk = nlk_sk(sk);
	struct netlink_callback *cb;
	struct sk_buff *skb = NULL;
	struct nlmsghdr *nlh;
	struct module *module;
	int len, err = -ENOBUFS;
	int alloc_min_size;
	int alloc_size;

	mutex_lock(nlk->cb_mutex);
	if (!nlk->cb_running) {
		err = -EINVAL;
		goto errout_skb;
	}

	if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf)
		goto errout_skb;

	/* NLMSG_GOODSIZE is small to avoid high order allocations being
         * required, but it makes sense to _attempt_ a 16K bytes allocation
         * to reduce number of system calls on dump operations, if user
         * ever provided a big enough buffer.
         */
	cb = &nlk->cb;
	alloc_min_size = max_t(int, cb->min_dump_alloc, NLMSG_GOODSIZE);

	if (alloc_min_size < nlk->max_recvmsg_len) {
		alloc_size = nlk->max_recvmsg_len;
		skb = alloc_skb(alloc_size,
				(GFP_KERNEL & ~__GFP_DIRECT_RECLAIM) |
				__GFP_NOWARN | __GFP_NORETRY);
	}
	if (!skb) {
		alloc_size = alloc_min_size;
		skb = alloc_skb(alloc_size, GFP_KERNEL);
	}
	if (!skb)
		goto errout_skb;

	/* Trim skb to allocated size. User is expected to provide buffer as
         * large as max(min_dump_alloc, 16KiB (mac_recvmsg_len capped at
         * netlink_recvmsg())). dump will pack as many smaller messages as
         * could fit within the allocated skb. skb is typically allocated
         * with larger space than required (could be as much as near 2x the
         * requested size with align to next power of 2 approach). Allowing
         * dump to use the excess space makes it difficult for a user to have a
         * reasonable static buffer based on the expected largest dump of a
         * single netdev. The outcome is MSG_TRUNC error.
         */
	skb_reserve(skb, skb_tailroom(skb) - alloc_size);
	netlink_skb_set_owner_r(skb, sk);

	len = cb->dump(skb, cb);

	if (len > 0) {
		mutex_unlock(nlk->cb_mutex);

		if (sk_filter(sk, skb))
			kfree_skb(skb);
		else
			__netlink_sendskb(sk, skb);
		return 0;
	}

	nlh = nlmsg_put_answer(skb, cb, NLMSG_DONE, sizeof(len), NLM_F_MULTI);
	if (!nlh)
		goto errout_skb;

	nl_dump_check_consistent(cb, nlh);

	memcpy(nlmsg_data(nlh), &len, sizeof(len));

	if (sk_filter(sk, skb))
		kfree_skb(skb);
	else
		__netlink_sendskb(sk, skb);

	if (cb->done)
		cb->done(cb);

	nlk->cb_running = false;
	module = cb->module;
	skb = cb->skb;
	mutex_unlock(nlk->cb_mutex);
	module_put(module);
	consume_skb(skb);
	return 0;

errout_skb:
	mutex_unlock(nlk->cb_mutex);
	kfree_skb(skb);
	return err;
}

Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 127 32.48% 2 9.52%
Arad, Ronen 50 12.79% 1 4.76%
Thomas Graf 45 11.51% 3 14.29%
Eric Dumazet 33 8.44% 3 14.29%
Patrick McHardy 32 8.18% 2 9.52%
Stephen Hemminger 30 7.67% 1 4.76%
Greg Rose 20 5.12% 1 4.76%
Herbert Xu 17 4.35% 1 4.76%
David S. Miller 13 3.32% 1 4.76%
Pravin B Shelar 8 2.05% 1 4.76%
Johannes Berg 7 1.79% 1 4.76%
Gao Feng 5 1.28% 1 4.76%
Florian Westphal 2 0.51% 1 4.76%
Dan Carpenter 1 0.26% 1 4.76%
Arnaldo Carvalho de Melo 1 0.26% 1 4.76%
Total 391 100.00% 21 100.00%



int __netlink_dump_start(struct sock *ssk, struct sk_buff *skb,
			 const struct nlmsghdr *nlh,
			 struct netlink_dump_control *control)
{
	struct netlink_callback *cb;
	struct sock *sk;
	struct netlink_sock *nlk;
	int ret;

	atomic_inc(&skb->users);

	sk = netlink_lookup(sock_net(ssk), ssk->sk_protocol, NETLINK_CB(skb).portid);
	if (sk == NULL) {
		ret = -ECONNREFUSED;
		goto error_free;
	}

	nlk = nlk_sk(sk);
	mutex_lock(nlk->cb_mutex);
	/* A dump is in progress... */
	if (nlk->cb_running) {
		ret = -EBUSY;
		goto error_unlock;
	}
	/* add reference of module which cb->dump belongs to */
	if (!try_module_get(control->module)) {
		ret = -EPROTONOSUPPORT;
		goto error_unlock;
	}

	cb = &nlk->cb;
	memset(cb, 0, sizeof(*cb));
	cb->start = control->start;
	cb->dump = control->dump;
	cb->done = control->done;
	cb->nlh = nlh;
	cb->data = control->data;
	cb->module = control->module;
	cb->min_dump_alloc = control->min_dump_alloc;
	cb->skb = skb;

	nlk->cb_running = true;

	mutex_unlock(nlk->cb_mutex);

	if (cb->start)
		cb->start(cb);

	ret = netlink_dump(sk);
	sock_put(sk);

	if (ret)
		return ret;

	/* We successfully started a dump, by returning -EINTR we
         * signal not to send ACK even if it was requested.
         */
	return -EINTR;

error_unlock:
	sock_put(sk);
	mutex_unlock(nlk->cb_mutex);
error_free:
	kfree_skb(skb);
	return ret;
}
Contributors
Person Tokens Prop Commits CommitProp
Pravin B Shelar 106 35.93% 1 5.56%
Linus Torvalds (pre-git) 83 28.14% 2 11.11%
Gao Feng 26 8.81% 1 5.56%
Tom Herbert 21 7.12% 1 5.56%
David S. Miller 15 5.08% 1 5.56%
Patrick McHardy 13 4.41% 3 16.67%
Andrey Vagin 12 4.07% 1 5.56%
Herbert Xu 5 1.69% 1 5.56%
Eric W. Biedermann 4 1.36% 2 11.11%
Denis V. Lunev 3 1.02% 1 5.56%
Hideaki Yoshifuji / 吉藤英明 3 1.02% 1 5.56%
Pablo Neira Ayuso 2 0.68% 1 5.56%
Arnaldo Carvalho de Melo 2 0.68% 2 11.11%
Total 295 100.00% 18 100.00%


EXPORT_SYMBOL(__netlink_dump_start);



void netlink_ack(struct sk_buff *in_skb, struct nlmsghdr *nlh, int err)
{
	struct sk_buff *skb;
	struct nlmsghdr *rep;
	struct nlmsgerr *errmsg;
	size_t payload = sizeof(*errmsg);
	struct netlink_sock *nlk = nlk_sk(NETLINK_CB(in_skb).sk);

	/* Error messages get the original request appened, unless the user
         * requests to cap the error message.
         */
	if (!(nlk->flags & NETLINK_F_CAP_ACK) && err)
		payload += nlmsg_len(nlh);

	skb = nlmsg_new(payload, GFP_KERNEL);
	if (!skb) {
		struct sock *sk;

		sk = netlink_lookup(sock_net(in_skb->sk),
				    in_skb->sk->sk_protocol,
				    NETLINK_CB(in_skb).portid);
		if (sk) {
			sk->sk_err = ENOBUFS;
			sk->sk_error_report(sk);
			sock_put(sk);
		}
		return;
	}

	rep = __nlmsg_put(skb, NETLINK_CB(in_skb).portid, nlh->nlmsg_seq,
			  NLMSG_ERROR, payload, 0);
	errmsg = nlmsg_data(rep);
	errmsg->error = err;
	memcpy(&errmsg->msg, nlh, payload > sizeof(*errmsg) ? nlh->nlmsg_len : sizeof(*nlh));
	netlink_unicast(in_skb->sk, skb, NETLINK_CB(in_skb).portid, MSG_DONTWAIT);
}
Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 118 50.86% 2 16.67%
David S. Miller 47 20.26% 1 8.33%
Christophe Ricard 32 13.79% 1 8.33%
Thomas Graf 22 9.48% 3 25.00%
Eric W. Biedermann 8 3.45% 2 16.67%
Hideaki Yoshifuji / 吉藤英明 3 1.29% 1 8.33%
John Fastabend 1 0.43% 1 8.33%
Florian Westphal 1 0.43% 1 8.33%
Total 232 100.00% 12 100.00%


EXPORT_SYMBOL(netlink_ack);



int netlink_rcv_skb(struct sk_buff *skb, int (*cb)(struct sk_buff *,
						     struct nlmsghdr *))
{
	struct nlmsghdr *nlh;
	int err;

	while (skb->len >= nlmsg_total_size(0)) {
		int msglen;

		nlh = nlmsg_hdr(skb);
		err = 0;

		if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len)
			return 0;

		/* Only requests are handled by the kernel */
		if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
			goto ack;

		/* Skip control messages */
		if (nlh->nlmsg_type < NLMSG_MIN_TYPE)
			goto ack;

		err = cb(skb, nlh);
		if (err == -EINTR)
			goto skip;

ack:
		if (nlh->nlmsg_flags & NLM_F_ACK || err)
			netlink_ack(skb, nlh, err);

skip:
		msglen = NLMSG_ALIGN(nlh->nlmsg_len);
		if (msglen > skb->len)
			msglen = skb->len;
		skb_pull(skb, msglen);
	}

	return 0;
}
Contributors
Person Tokens Prop Commits CommitProp
Thomas Graf 149 82.32% 4 50.00%
Denis V. Lunev 23 12.71% 2 25.00%
Martin Murray 6 3.31% 1 12.50%
Arnaldo Carvalho de Melo 3 1.66% 1 12.50%
Total 181 100.00% 8 100.00%


EXPORT_SYMBOL(netlink_rcv_skb);

/**
 * nlmsg_notify - send a notification netlink message
 * @sk: netlink socket to use
 * @skb: notification message
 * @portid: destination netlink portid for reports or 0
 * @group: destination multicast group or 0
 * @report: 1 to report back, 0 to disable
 * @flags: allocation flags
 */


int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 portid,
		 unsigned int group, int report, gfp_t flags)
{
	int err = 0;

	if (group) {
		int exclude_portid = 0;

		if (report) {
			atomic_inc(&skb->users);
			exclude_portid = portid;
		}

		/* errors reported via destination sk->sk_err, but propagate
                 * delivery errors if NETLINK_BROADCAST_ERROR flag is set */
		err = nlmsg_multicast(sk, skb, exclude_portid, group, flags);
	}

	if (report) {
		int err2;

		err2 = nlmsg_unicast(sk, skb, portid);
		if (!err || err == -ESRCH)
			err = err2;
	}

	return err;
}
Contributors
Person Tokens Prop Commits CommitProp
Thomas Graf 86 74.78% 1 33.33%
Pablo Neira Ayuso 23 20.00% 1 33.33%
Eric W. Biedermann 6 5.22% 1 33.33%
Total 115 100.00% 3 100.00%


EXPORT_SYMBOL(nlmsg_notify);

#ifdef CONFIG_PROC_FS

struct nl_seq_iter {
	
struct seq_net_private p;
	
struct rhashtable_iter hti;
	
int link;
};



static int netlink_walk_start(struct nl_seq_iter *iter)
{
	int err;

	err = rhashtable_walk_init(&nl_table[iter->link].hash, &iter->hti,
				   GFP_KERNEL);
	if (err) {
		iter->link = MAX_LINKS;
		return err;
	}

	err = rhashtable_walk_start(&iter->hti);
	return err == -EAGAIN ? 0 : err;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 48 67.61% 2 33.33%
Stephen Hemminger 17 23.94% 1 16.67%
Thomas Graf 2 2.82% 1 16.67%
Bob Copeland 2 2.82% 1 16.67%
Linus Torvalds (pre-git) 2 2.82% 1 16.67%
Total 71 100.00% 6 100.00%



static void netlink_walk_stop(struct nl_seq_iter *iter)
{
	rhashtable_walk_stop(&iter->hti);
	rhashtable_walk_exit(&iter->hti);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 16 59.26% 1 20.00%
Stephen Hemminger 8 29.63% 1 20.00%
Arnaldo Carvalho de Melo 1 3.70% 1 20.00%
Thomas Graf 1 3.70% 1 20.00%
Linus Torvalds (pre-git) 1 3.70% 1 20.00%
Total 27 100.00% 5 100.00%



static void *__netlink_seq_next(struct seq_file *seq)
{
	struct nl_seq_iter *iter = seq->private;
	struct netlink_sock *nlk;

	do {
		for (;;) {
			int err;

			nlk = rhashtable_walk_next(&iter->hti);

			if (IS_ERR(nlk)) {
				if (PTR_ERR(nlk) == -EAGAIN)
					continue;

				return nlk;
			}

			if (nlk)
				break;

			netlink_walk_stop(iter);
			if (++iter->link >= MAX_LINKS)
				return NULL;

			err = netlink_walk_start(iter);
			if (err)
				return ERR_PTR(err);
		}
	} while (sock_net(&nlk->sk) != seq_file_net(seq));

	return nlk;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 90 69.23% 2 22.22%
Stephen Hemminger 16 12.31% 1 11.11%
Thomas Graf 14 10.77% 3 33.33%
Gao Feng 5 3.85% 1 11.11%
Eric W. Biedermann 3 2.31% 1 11.11%
Hideaki Yoshifuji / 吉藤英明 2 1.54% 1 11.11%
Total 130 100.00% 9 100.00%



static void *netlink_seq_start(struct seq_file *seq, loff_t *posp)
{
	struct nl_seq_iter *iter = seq->private;
	void *obj = SEQ_START_TOKEN;
	loff_t pos;
	int err;

	iter->link = 0;

	err = netlink_walk_start(iter);
	if (err)
		return ERR_PTR(err);

	for (pos = *posp; pos && obj && !IS_ERR(obj); pos--)
		obj = __netlink_seq_next(seq);

	return obj;
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 82 91.11% 2 40.00%
Stephen Hemminger 4 4.44% 1 20.00%
Eric W. Biedermann 3 3.33% 1 20.00%
Thomas Graf 1 1.11% 1 20.00%
Total 90 100.00% 5 100.00%



static void *netlink_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	++*pos;
	return __netlink_seq_next(seq);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 27 90.00% 2 66.67%
Stephen Hemminger 3 10.00% 1 33.33%
Total 30 100.00% 3 100.00%



static void netlink_seq_stop(struct seq_file *seq, void *v)
{
	struct nl_seq_iter *iter = seq->private;

	if (iter->link >= MAX_LINKS)
		return;

	netlink_walk_stop(iter);
}


Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 22 57.89% 1 50.00%
Stephen Hemminger 16 42.11% 1 50.00%
Total 38 100.00% 2 100.00%



static int netlink_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN) {
		seq_puts(seq,
			 "sk       Eth Pid    Groups   "
			 "Rmem     Wmem     Dump     Locks     Drops     Inode\n");
	} else {
		struct sock *s = v;
		struct netlink_sock *nlk = nlk_sk(s);

		seq_printf(seq, "%pK %-3d %-6u %08x %-8d %-8d %d %-8d %-8d %-8lu\n",
			   s,
			   s->sk_protocol,
			   nlk->portid,
			   nlk->groups ? (u32)nlk->groups[0] : 0,
			   sk_rmem_alloc_get(s),
			   sk_wmem_alloc_get(s),
			   nlk->cb_running,
			   atomic_read(&s->sk_refcnt),
			   atomic_read(&s->sk_drops),
			   sock_i_ino(s)
			);

	}
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Stephen Hemminger 42 34.43% 1 6.67%
Linus Torvalds (pre-git) 31 25.41% 2 13.33%
David S. Miller 12 9.84% 1 6.67%
Patrick McHardy 12 9.84% 2 13.33%
Pablo Neira Ayuso 8 6.56% 1 6.67%
Masatake YAMATO 6 4.92% 1 6.67%
Eric Dumazet 4 3.28% 2 13.33%
Arnaldo Carvalho de Melo 3 2.46% 2 13.33%
Pravin B Shelar 2 1.64% 1 6.67%
Eric W. Biedermann 1 0.82% 1 6.67%
John Levon 1 0.82% 1 6.67%
Total 122 100.00% 15 100.00%


static const struct seq_operations netlink_seq_ops = {
	.start  = netlink_seq_start,
	.next   = netlink_seq_next,
	.stop   = netlink_seq_stop,
	.show   = netlink_seq_show,
};




static int netlink_seq_open(struct inode *inode, struct file *file)
{
	return seq_open_net(inode, file, &netlink_seq_ops,
				sizeof(struct nl_seq_iter));
}

Contributors
Person Tokens Prop Commits CommitProp
Stephen Hemminger 14 42.42% 1 16.67%
Eric W. Biedermann 5 15.15% 1 16.67%
Denis V. Lunev 5 15.15% 1 16.67%
Pavel Emelyanov 5 15.15% 1 16.67%
Herbert Xu 3 9.09% 1 16.67%
Linus Torvalds (pre-git) 1 3.03% 1 16.67%
Total 33 100.00% 6 100.00%


static const struct file_operations netlink_seq_fops = {
	.owner		= THIS_MODULE,
	.open		= netlink_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release_net,
};

#endif



int netlink_register_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_register(&netlink_chain, nb);
}
Contributors
Person Tokens Prop Commits CommitProp
James Morris 18 94.74% 1 50.00%
Américo Wang 1 5.26% 1 50.00%
Total 19 100.00% 2 100.00%


EXPORT_SYMBOL(netlink_register_notifier);



int netlink_unregister_notifier(struct notifier_block *nb)
{
	return blocking_notifier_chain_unregister(&netlink_chain, nb);
}
Contributors
Person Tokens Prop Commits CommitProp
James Morris 18 94.74% 1 50.00%
Américo Wang 1 5.26% 1 50.00%
Total 19 100.00% 2 100.00%


EXPORT_SYMBOL(netlink_unregister_notifier);


static const struct proto_ops netlink_ops = {
	.family =	PF_NETLINK,
	.owner =	THIS_MODULE,
	.release =	netlink_release,
	.bind =		netlink_bind,
	.connect =	netlink_connect,
	.socketpair =	sock_no_socketpair,
	.accept =	sock_no_accept,
	.getname =	netlink_getname,
	.poll =		datagram_poll,
	.ioctl =	netlink_ioctl,
	.listen =	sock_no_listen,
	.shutdown =	sock_no_shutdown,
	.setsockopt =	netlink_setsockopt,
	.getsockopt =	netlink_getsockopt,
	.sendmsg =	netlink_sendmsg,
	.recvmsg =	netlink_recvmsg,
	.mmap =		sock_no_mmap,
	.sendpage =	sock_no_sendpage,
};


static const struct net_proto_family netlink_family_ops = {
	.family = PF_NETLINK,
	.create = netlink_create,
	.owner	= THIS_MODULE,	/* for consistency 8) */
};



static int __net_init netlink_net_init(struct net *net)
{
#ifdef CONFIG_PROC_FS
	if (!proc_create("netlink", 0, net->proc_net, &netlink_seq_fops))
		return -ENOMEM;
#endif
	return 0;
}

Contributors
Person Tokens Prop Commits CommitProp
Eric W. Biedermann 35 85.37% 1 33.33%
Gao Feng 5 12.20% 1 33.33%
Pavel Emelyanov 1 2.44% 1 33.33%
Total 41 100.00% 3 100.00%



static void __net_exit netlink_net_exit(struct net *net)
{
#ifdef CONFIG_PROC_FS
	remove_proc_entry("netlink", net->proc_net);
#endif
}

Contributors
Person Tokens Prop Commits CommitProp
Eric W. Biedermann 20 76.92% 1 33.33%
Gao Feng 5 19.23% 1 33.33%
Pavel Emelyanov 1 3.85% 1 33.33%
Total 26 100.00% 3 100.00%



static void __init netlink_add_usersock_entry(void)
{
	struct listeners *listeners;
	int groups = 32;

	listeners = kzalloc(sizeof(*listeners) + NLGRPSZ(groups), GFP_KERNEL);
	if (!listeners)
		panic("netlink_add_usersock_entry: Cannot allocate listeners\n");

	netlink_table_grab();

	nl_table[NETLINK_USERSOCK].groups = groups;
	rcu_assign_pointer(nl_table[NETLINK_USERSOCK].listeners, listeners);
	nl_table[NETLINK_USERSOCK].module = THIS_MODULE;
	nl_table[NETLINK_USERSOCK].registered = 1;
	nl_table[NETLINK_USERSOCK].flags = NL_CFG_F_NONROOT_SEND;

	netlink_table_ungrab();
}

Contributors
Person Tokens Prop Commits CommitProp
David S. Miller 80 79.21% 1 25.00%
Eric Dumazet 12 11.88% 1 25.00%
Pablo Neira Ayuso 9 8.91% 2 50.00%
Total 101 100.00% 4 100.00%


static struct pernet_operations __net_initdata netlink_net_ops = {
	.init = netlink_net_init,
	.exit = netlink_net_exit,
};



static inline u32 netlink_hash(const void *data, u32 len, u32 seed)
{
	const struct netlink_sock *nlk = data;
	struct netlink_compare_arg arg;

	netlink_compare_arg_init(&arg, sock_net(&nlk->sk), nlk->portid);
	return jhash2((u32 *)&arg, netlink_compare_arg_len / sizeof(u32), seed);
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 55 80.88% 3 42.86%
Linus Torvalds (pre-git) 5 7.35% 2 28.57%
Arnaldo Carvalho de Melo 5 7.35% 1 14.29%
Patrick McHardy 3 4.41% 1 14.29%
Total 68 100.00% 7 100.00%


static const struct rhashtable_params netlink_rhashtable_params = {
	.head_offset = offsetof(struct netlink_sock, node),
	.key_len = netlink_compare_arg_len,
	.obj_hashfn = netlink_hash,
	.obj_cmpfn = netlink_compare,
	.automatic_shrinking = true,
};



static int __init netlink_proto_init(void)
{
	int i;
	int err = proto_register(&netlink_proto, 0);

	if (err != 0)
		goto out;

	BUILD_BUG_ON(sizeof(struct netlink_skb_parms) > FIELD_SIZEOF(struct sk_buff, cb));

	nl_table = kcalloc(MAX_LINKS, sizeof(*nl_table), GFP_KERNEL);
	if (!nl_table)
		goto panic;

	for (i = 0; i < MAX_LINKS; i++) {
		if (rhashtable_init(&nl_table[i].hash,
				    &netlink_rhashtable_params) < 0) {
			while (--i > 0)
				rhashtable_destroy(&nl_table[i].hash);
			kfree(nl_table);
			goto panic;
		}
	}

	INIT_LIST_HEAD(&netlink_tap_all);

	netlink_add_usersock_entry();

	sock_register(&netlink_family_ops);
	register_pernet_subsys(&netlink_net_ops);
	/* The netlink device handler may be needed early. */
	rtnetlink_init();
out:
	return err;
panic:
	panic("netlink_init: Cannot allocate nl_table\n");
}

Contributors
Person Tokens Prop Commits CommitProp
Herbert Xu 88 51.76% 2 12.50%
Linus Torvalds (pre-git) 21 12.35% 3 18.75%
Arnaldo Carvalho de Melo 16 9.41% 2 12.50%
Thomas Graf 12 7.06% 1 6.25%
Akinobu Mita 11 6.47% 1 6.25%
Hideaki Yoshifuji / 吉藤英明 7 4.12% 2 12.50%
Daniel Borkmann 6 3.53% 1 6.25%
Panagiotis Issaris 3 1.76% 1 6.25%
Eric W. Biedermann 3 1.76% 2 12.50%
David S. Miller 3 1.76% 1 6.25%
Total 170 100.00% 16 100.00%


core_initcall(netlink_proto_init);
Overall Contributors
Person Tokens Prop Commits CommitProp
Linus Torvalds (pre-git) 2245 18.44% 18 6.14%
Patrick McHardy 1664 13.67% 24 8.19%
Herbert Xu 1628 13.37% 26 8.87%
Daniel Borkmann 676 5.55% 8 2.73%
Eric W. Biedermann 645 5.30% 14 4.78%
Johannes Berg 640 5.26% 14 4.78%
Pablo Neira Ayuso 562 4.62% 17 5.80%
Thomas Graf 552 4.53% 17 5.80%
David S. Miller 347 2.85% 13 4.44%
Eric Dumazet 278 2.28% 17 5.80%
Stephen Hemminger 252 2.07% 8 2.73%
Nicolas Dichtel 246 2.02% 2 0.68%
Florian Westphal 246 2.02% 2 0.68%
Richard Guy Briggs 232 1.91% 2 0.68%
Andrew Morton 207 1.70% 2 0.68%
Denis V. Lunev 171 1.40% 10 3.41%
James Morris 150 1.23% 9 3.07%
David Herrmann 146 1.20% 2 0.68%
Denys Vlasenko 127 1.04% 1 0.34%
Christophe Ricard 122 1.00% 1 0.34%
Arnaldo Carvalho de Melo 122 1.00% 11 3.75%
Pravin B Shelar 117 0.96% 1 0.34%
Gao Feng 93 0.76% 4 1.37%
Harald Welte 71 0.58% 1 0.34%
Benjamin LaHaise 57 0.47% 1 0.34%
Ying Xue 51 0.42% 1 0.34%
Arad, Ronen 50 0.41% 1 0.34%
Andrey Vagin 50 0.41% 2 0.68%
Hideaki Yoshifuji / 吉藤英明 45 0.37% 6 2.05%
Rusty Russell 38 0.31% 1 0.34%
David Decotigny 25 0.21% 1 0.34%
Pavel Emelyanov 23 0.19% 3 1.02%
Tom Herbert 21 0.17% 1 0.34%
Greg Rose 20 0.16% 1 0.34%
Neil Horman 16 0.13% 1 0.34%
Changli Gao 15 0.12% 1 0.34%
Steffen Hurrle 15 0.12% 1 0.34%
Alexey Dobriyan 15 0.12% 1 0.34%
Akinobu Mita 15 0.12% 1 0.34%
Hannes Frederic Sowa 14 0.11% 1 0.34%
Hiroaki SHIMODA 12 0.10% 1 0.34%
Tommy S. Christensen 11 0.09% 2 0.68%
Alexey Kuznetsov 10 0.08% 1 0.34%
Jesper Juhl 8 0.07% 1 0.34%
Heiko Carstens 8 0.07% 1 0.34%
Matthew Wilcox 7 0.06% 1 0.34%
Al Viro 7 0.06% 4 1.37%
Cyrill V. Gorcunov 7 0.06% 1 0.34%
Linus Torvalds 6 0.05% 4 1.37%
Masatake YAMATO 6 0.05% 1 0.34%
Martin Murray 6 0.05% 1 0.34%
Mike Pecovnik 6 0.05% 1 0.34%
Christoph Hellwig 5 0.04% 1 0.34%
Octavian Purdila 5 0.04% 1 0.34%
Rami Rosen 5 0.04% 1 0.34%
Arjan van de Ven 5 0.04% 2 0.68%
Américo Wang 4 0.03% 1 0.34%
Thomas Gleixner 4 0.03% 1 0.34%
Dmitry Ivanov 4 0.03% 1 0.34%
Art Haas 4 0.03% 1 0.34%
Eric Paris 3 0.02% 1 0.34%
Randy Dunlap 3 0.02% 1 0.34%
Thomas Goff 3 0.02% 1 0.34%
Ilpo Järvinen 3 0.02% 1 0.34%
Varka Bhadram 3 0.02% 1 0.34%
Panagiotis Issaris 3 0.02% 1 0.34%
Alan Stern 3 0.02% 1 0.34%
Mel Gorman 3 0.02% 1 0.34%
Lai Jiangshan 2 0.02% 1 0.34%
Bob Copeland 2 0.02% 1 0.34%
Hong Zhi Guo 2 0.02% 1 0.34%
Philippe De Muyter 1 0.01% 1 0.34%
Dan Carpenter 1 0.01% 1 0.34%
John Fastabend 1 0.01% 1 0.34%
Adrian Bunk 1 0.01% 1 0.34%
Ben Pfaff 1 0.01% 1 0.34%
John Levon 1 0.01% 1 0.34%
Total 12175 100.00% 293 100.00%
Directory: net/netlink

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.
Person	Tokens	Prop	Commits	CommitProp
Denis V. Lunev	21	95.45%	1	50.00%
Nicolas Dichtel	1	4.55%	1	50.00%
Total	22	100.00%	2	100.00%
cregit-Linux how code gets into the kernel

Release 4.11 net/netlink/af_netlink.c

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