sock.c 60.4 KB
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/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		Generic socket support routines. Memory allocators, socket lock/release
 *		handler for protocols to use and generic option handler.
 *
 *
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 * Authors:	Ross Biro
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 *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 *		Florian La Roche, <flla@stud.uni-sb.de>
 *		Alan Cox, <A.Cox@swansea.ac.uk>
 *
 * Fixes:
 *		Alan Cox	: 	Numerous verify_area() problems
 *		Alan Cox	:	Connecting on a connecting socket
 *					now returns an error for tcp.
 *		Alan Cox	:	sock->protocol is set correctly.
 *					and is not sometimes left as 0.
 *		Alan Cox	:	connect handles icmp errors on a
 *					connect properly. Unfortunately there
 *					is a restart syscall nasty there. I
 *					can't match BSD without hacking the C
 *					library. Ideas urgently sought!
 *		Alan Cox	:	Disallow bind() to addresses that are
 *					not ours - especially broadcast ones!!
 *		Alan Cox	:	Socket 1024 _IS_ ok for users. (fencepost)
 *		Alan Cox	:	sock_wfree/sock_rfree don't destroy sockets,
 *					instead they leave that for the DESTROY timer.
 *		Alan Cox	:	Clean up error flag in accept
 *		Alan Cox	:	TCP ack handling is buggy, the DESTROY timer
 *					was buggy. Put a remove_sock() in the handler
 *					for memory when we hit 0. Also altered the timer
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 *					code. The ACK stuff can wait and needs major
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 *					TCP layer surgery.
 *		Alan Cox	:	Fixed TCP ack bug, removed remove sock
 *					and fixed timer/inet_bh race.
 *		Alan Cox	:	Added zapped flag for TCP
 *		Alan Cox	:	Move kfree_skb into skbuff.c and tidied up surplus code
 *		Alan Cox	:	for new sk_buff allocations wmalloc/rmalloc now call alloc_skb
 *		Alan Cox	:	kfree_s calls now are kfree_skbmem so we can track skb resources
 *		Alan Cox	:	Supports socket option broadcast now as does udp. Packet and raw need fixing.
 *		Alan Cox	:	Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so...
 *		Rick Sladkey	:	Relaxed UDP rules for matching packets.
 *		C.E.Hawkins	:	IFF_PROMISC/SIOCGHWADDR support
 *	Pauline Middelink	:	identd support
 *		Alan Cox	:	Fixed connect() taking signals I think.
 *		Alan Cox	:	SO_LINGER supported
 *		Alan Cox	:	Error reporting fixes
 *		Anonymous	:	inet_create tidied up (sk->reuse setting)
 *		Alan Cox	:	inet sockets don't set sk->type!
 *		Alan Cox	:	Split socket option code
 *		Alan Cox	:	Callbacks
 *		Alan Cox	:	Nagle flag for Charles & Johannes stuff
 *		Alex		:	Removed restriction on inet fioctl
 *		Alan Cox	:	Splitting INET from NET core
 *		Alan Cox	:	Fixed bogus SO_TYPE handling in getsockopt()
 *		Adam Caldwell	:	Missing return in SO_DONTROUTE/SO_DEBUG code
 *		Alan Cox	:	Split IP from generic code
 *		Alan Cox	:	New kfree_skbmem()
 *		Alan Cox	:	Make SO_DEBUG superuser only.
 *		Alan Cox	:	Allow anyone to clear SO_DEBUG
 *					(compatibility fix)
 *		Alan Cox	:	Added optimistic memory grabbing for AF_UNIX throughput.
 *		Alan Cox	:	Allocator for a socket is settable.
 *		Alan Cox	:	SO_ERROR includes soft errors.
 *		Alan Cox	:	Allow NULL arguments on some SO_ opts
 *		Alan Cox	: 	Generic socket allocation to make hooks
 *					easier (suggested by Craig Metz).
 *		Michael Pall	:	SO_ERROR returns positive errno again
 *              Steve Whitehouse:       Added default destructor to free
 *                                      protocol private data.
 *              Steve Whitehouse:       Added various other default routines
 *                                      common to several socket families.
 *              Chris Evans     :       Call suser() check last on F_SETOWN
 *		Jay Schulist	:	Added SO_ATTACH_FILTER and SO_DETACH_FILTER.
 *		Andi Kleen	:	Add sock_kmalloc()/sock_kfree_s()
 *		Andi Kleen	:	Fix write_space callback
 *		Chris Evans	:	Security fixes - signedness again
 *		Arnaldo C. Melo :       cleanups, use skb_queue_purge
 *
 * To Fix:
 *
 *
 *		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.
 */

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#include <linux/capability.h>
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#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/poll.h>
#include <linux/tcp.h>
#include <linux/init.h>
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#include <linux/highmem.h>
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#include <asm/uaccess.h>
#include <asm/system.h>

#include <linux/netdevice.h>
#include <net/protocol.h>
#include <linux/skbuff.h>
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#include <net/net_namespace.h>
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#include <net/request_sock.h>
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#include <net/sock.h>
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#include <linux/net_tstamp.h>
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#include <net/xfrm.h>
#include <linux/ipsec.h>

#include <linux/filter.h>

#ifdef CONFIG_INET
#include <net/tcp.h>
#endif

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/*
 * Each address family might have different locking rules, so we have
 * one slock key per address family:
 */
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static struct lock_class_key af_family_keys[AF_MAX];
static struct lock_class_key af_family_slock_keys[AF_MAX];

/*
 * Make lock validator output more readable. (we pre-construct these
 * strings build-time, so that runtime initialization of socket
 * locks is fast):
 */
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static const char *const af_family_key_strings[AF_MAX+1] = {
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  "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX"     , "sk_lock-AF_INET"     ,
  "sk_lock-AF_AX25"  , "sk_lock-AF_IPX"      , "sk_lock-AF_APPLETALK",
  "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE"   , "sk_lock-AF_ATMPVC"   ,
  "sk_lock-AF_X25"   , "sk_lock-AF_INET6"    , "sk_lock-AF_ROSE"     ,
  "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI"  , "sk_lock-AF_SECURITY" ,
  "sk_lock-AF_KEY"   , "sk_lock-AF_NETLINK"  , "sk_lock-AF_PACKET"   ,
  "sk_lock-AF_ASH"   , "sk_lock-AF_ECONET"   , "sk_lock-AF_ATMSVC"   ,
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  "sk_lock-AF_RDS"   , "sk_lock-AF_SNA"      , "sk_lock-AF_IRDA"     ,
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  "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE"  , "sk_lock-AF_LLC"      ,
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  "sk_lock-27"       , "sk_lock-28"          , "sk_lock-AF_CAN"      ,
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  "sk_lock-AF_TIPC"  , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV"        ,
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  "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN"     , "sk_lock-AF_PHONET"   ,
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  "sk_lock-AF_IEEE802154",
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  "sk_lock-AF_MAX"
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};
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static const char *const af_family_slock_key_strings[AF_MAX+1] = {
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  "slock-AF_UNSPEC", "slock-AF_UNIX"     , "slock-AF_INET"     ,
  "slock-AF_AX25"  , "slock-AF_IPX"      , "slock-AF_APPLETALK",
  "slock-AF_NETROM", "slock-AF_BRIDGE"   , "slock-AF_ATMPVC"   ,
  "slock-AF_X25"   , "slock-AF_INET6"    , "slock-AF_ROSE"     ,
  "slock-AF_DECnet", "slock-AF_NETBEUI"  , "slock-AF_SECURITY" ,
  "slock-AF_KEY"   , "slock-AF_NETLINK"  , "slock-AF_PACKET"   ,
  "slock-AF_ASH"   , "slock-AF_ECONET"   , "slock-AF_ATMSVC"   ,
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  "slock-AF_RDS"   , "slock-AF_SNA"      , "slock-AF_IRDA"     ,
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  "slock-AF_PPPOX" , "slock-AF_WANPIPE"  , "slock-AF_LLC"      ,
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  "slock-27"       , "slock-28"          , "slock-AF_CAN"      ,
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  "slock-AF_TIPC"  , "slock-AF_BLUETOOTH", "slock-AF_IUCV"     ,
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  "slock-AF_RXRPC" , "slock-AF_ISDN"     , "slock-AF_PHONET"   ,
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  "slock-AF_IEEE802154",
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  "slock-AF_MAX"
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};
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static const char *const af_family_clock_key_strings[AF_MAX+1] = {
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  "clock-AF_UNSPEC", "clock-AF_UNIX"     , "clock-AF_INET"     ,
  "clock-AF_AX25"  , "clock-AF_IPX"      , "clock-AF_APPLETALK",
  "clock-AF_NETROM", "clock-AF_BRIDGE"   , "clock-AF_ATMPVC"   ,
  "clock-AF_X25"   , "clock-AF_INET6"    , "clock-AF_ROSE"     ,
  "clock-AF_DECnet", "clock-AF_NETBEUI"  , "clock-AF_SECURITY" ,
  "clock-AF_KEY"   , "clock-AF_NETLINK"  , "clock-AF_PACKET"   ,
  "clock-AF_ASH"   , "clock-AF_ECONET"   , "clock-AF_ATMSVC"   ,
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  "clock-AF_RDS"   , "clock-AF_SNA"      , "clock-AF_IRDA"     ,
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  "clock-AF_PPPOX" , "clock-AF_WANPIPE"  , "clock-AF_LLC"      ,
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  "clock-27"       , "clock-28"          , "clock-AF_CAN"      ,
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  "clock-AF_TIPC"  , "clock-AF_BLUETOOTH", "clock-AF_IUCV"     ,
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  "clock-AF_RXRPC" , "clock-AF_ISDN"     , "clock-AF_PHONET"   ,
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  "clock-AF_IEEE802154",
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  "clock-AF_MAX"
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};
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/*
 * sk_callback_lock locking rules are per-address-family,
 * so split the lock classes by using a per-AF key:
 */
static struct lock_class_key af_callback_keys[AF_MAX];

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/* Take into consideration the size of the struct sk_buff overhead in the
 * determination of these values, since that is non-constant across
 * platforms.  This makes socket queueing behavior and performance
 * not depend upon such differences.
 */
#define _SK_MEM_PACKETS		256
#define _SK_MEM_OVERHEAD	(sizeof(struct sk_buff) + 256)
#define SK_WMEM_MAX		(_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)
#define SK_RMEM_MAX		(_SK_MEM_OVERHEAD * _SK_MEM_PACKETS)

/* Run time adjustable parameters. */
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__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX;
__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX;
__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX;
__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX;
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/* Maximal space eaten by iovec or ancilliary data plus some space */
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int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512);
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EXPORT_SYMBOL(sysctl_optmem_max);
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static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen)
{
	struct timeval tv;

	if (optlen < sizeof(tv))
		return -EINVAL;
	if (copy_from_user(&tv, optval, sizeof(tv)))
		return -EFAULT;
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	if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC)
		return -EDOM;
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	if (tv.tv_sec < 0) {
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		static int warned __read_mostly;

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		*timeo_p = 0;
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		if (warned < 10 && net_ratelimit()) {
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			warned++;
			printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) "
			       "tries to set negative timeout\n",
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				current->comm, task_pid_nr(current));
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		}
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		return 0;
	}
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	*timeo_p = MAX_SCHEDULE_TIMEOUT;
	if (tv.tv_sec == 0 && tv.tv_usec == 0)
		return 0;
	if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1))
		*timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ);
	return 0;
}

static void sock_warn_obsolete_bsdism(const char *name)
{
	static int warned;
	static char warncomm[TASK_COMM_LEN];
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	if (strcmp(warncomm, current->comm) && warned < 5) {
		strcpy(warncomm,  current->comm);
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		printk(KERN_WARNING "process `%s' is using obsolete "
		       "%s SO_BSDCOMPAT\n", warncomm, name);
		warned++;
	}
}

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static void sock_disable_timestamp(struct sock *sk, int flag)
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{
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	if (sock_flag(sk, flag)) {
		sock_reset_flag(sk, flag);
		if (!sock_flag(sk, SOCK_TIMESTAMP) &&
		    !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) {
			net_disable_timestamp();
		}
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	}
}


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int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
	int err = 0;
	int skb_len;

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	/* Cast sk->rcvbuf to unsigned... It's pointless, but reduces
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	   number of warnings when compiling with -W --ANK
	 */
	if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
	    (unsigned)sk->sk_rcvbuf) {
		err = -ENOMEM;
		goto out;
	}

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	err = sk_filter(sk, skb);
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	if (err)
		goto out;

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	if (!sk_rmem_schedule(sk, skb->truesize)) {
		err = -ENOBUFS;
		goto out;
	}

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	skb->dev = NULL;
	skb_set_owner_r(skb, sk);
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	/* Cache the SKB length before we tack it onto the receive
	 * queue.  Once it is added it no longer belongs to us and
	 * may be freed by other threads of control pulling packets
	 * from the queue.
	 */
	skb_len = skb->len;

	skb_queue_tail(&sk->sk_receive_queue, skb);

	if (!sock_flag(sk, SOCK_DEAD))
		sk->sk_data_ready(sk, skb_len);
out:
	return err;
}
EXPORT_SYMBOL(sock_queue_rcv_skb);

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int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested)
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{
	int rc = NET_RX_SUCCESS;

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	if (sk_filter(sk, skb))
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		goto discard_and_relse;

	skb->dev = NULL;

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	if (nested)
		bh_lock_sock_nested(sk);
	else
		bh_lock_sock(sk);
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	if (!sock_owned_by_user(sk)) {
		/*
		 * trylock + unlock semantics:
		 */
		mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_);

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		rc = sk_backlog_rcv(sk, skb);
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		mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
	} else
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		sk_add_backlog(sk, skb);
	bh_unlock_sock(sk);
out:
	sock_put(sk);
	return rc;
discard_and_relse:
	kfree_skb(skb);
	goto out;
}
EXPORT_SYMBOL(sk_receive_skb);

struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
{
	struct dst_entry *dst = sk->sk_dst_cache;

	if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
		sk->sk_dst_cache = NULL;
		dst_release(dst);
		return NULL;
	}

	return dst;
}
EXPORT_SYMBOL(__sk_dst_check);

struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie)
{
	struct dst_entry *dst = sk_dst_get(sk);

	if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
		sk_dst_reset(sk);
		dst_release(dst);
		return NULL;
	}

	return dst;
}
EXPORT_SYMBOL(sk_dst_check);

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static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen)
{
	int ret = -ENOPROTOOPT;
#ifdef CONFIG_NETDEVICES
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	struct net *net = sock_net(sk);
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	char devname[IFNAMSIZ];
	int index;

	/* Sorry... */
	ret = -EPERM;
	if (!capable(CAP_NET_RAW))
		goto out;

	ret = -EINVAL;
	if (optlen < 0)
		goto out;

	/* Bind this socket to a particular device like "eth0",
	 * as specified in the passed interface name. If the
	 * name is "" or the option length is zero the socket
	 * is not bound.
	 */
	if (optlen > IFNAMSIZ - 1)
		optlen = IFNAMSIZ - 1;
	memset(devname, 0, sizeof(devname));

	ret = -EFAULT;
	if (copy_from_user(devname, optval, optlen))
		goto out;

	if (devname[0] == '\0') {
		index = 0;
	} else {
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		struct net_device *dev = dev_get_by_name(net, devname);
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		ret = -ENODEV;
		if (!dev)
			goto out;

		index = dev->ifindex;
		dev_put(dev);
	}

	lock_sock(sk);
	sk->sk_bound_dev_if = index;
	sk_dst_reset(sk);
	release_sock(sk);

	ret = 0;

out:
#endif

	return ret;
}

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static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
{
	if (valbool)
		sock_set_flag(sk, bit);
	else
		sock_reset_flag(sk, bit);
}

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/*
 *	This is meant for all protocols to use and covers goings on
 *	at the socket level. Everything here is generic.
 */

int sock_setsockopt(struct socket *sock, int level, int optname,
		    char __user *optval, int optlen)
{
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	struct sock *sk = sock->sk;
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	int val;
	int valbool;
	struct linger ling;
	int ret = 0;
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	/*
	 *	Options without arguments
	 */

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	if (optname == SO_BINDTODEVICE)
		return sock_bindtodevice(sk, optval, optlen);

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	if (optlen < sizeof(int))
		return -EINVAL;
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	if (get_user(val, (int __user *)optval))
		return -EFAULT;
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	valbool = val ? 1 : 0;
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	lock_sock(sk);

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	switch (optname) {
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	case SO_DEBUG:
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		if (val && !capable(CAP_NET_ADMIN))
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			ret = -EACCES;
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		else
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			sock_valbool_flag(sk, SOCK_DBG, valbool);
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		break;
	case SO_REUSEADDR:
		sk->sk_reuse = valbool;
		break;
	case SO_TYPE:
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	case SO_PROTOCOL:
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	case SO_DOMAIN:
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	case SO_ERROR:
		ret = -ENOPROTOOPT;
		break;
	case SO_DONTROUTE:
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		sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
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		break;
	case SO_BROADCAST:
		sock_valbool_flag(sk, SOCK_BROADCAST, valbool);
		break;
	case SO_SNDBUF:
		/* Don't error on this BSD doesn't and if you think
		   about it this is right. Otherwise apps have to
		   play 'guess the biggest size' games. RCVBUF/SNDBUF
		   are treated in BSD as hints */

		if (val > sysctl_wmem_max)
			val = sysctl_wmem_max;
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set_sndbuf:
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		sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
		if ((val * 2) < SOCK_MIN_SNDBUF)
			sk->sk_sndbuf = SOCK_MIN_SNDBUF;
		else
			sk->sk_sndbuf = val * 2;
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		/*
		 *	Wake up sending tasks if we
		 *	upped the value.
		 */
		sk->sk_write_space(sk);
		break;
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	case SO_SNDBUFFORCE:
		if (!capable(CAP_NET_ADMIN)) {
			ret = -EPERM;
			break;
		}
		goto set_sndbuf;
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525 526 527 528 529
	case SO_RCVBUF:
		/* Don't error on this BSD doesn't and if you think
		   about it this is right. Otherwise apps have to
		   play 'guess the biggest size' games. RCVBUF/SNDBUF
		   are treated in BSD as hints */
530

531 532
		if (val > sysctl_rmem_max)
			val = sysctl_rmem_max;
533
set_rcvbuf:
534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558
		sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
		/*
		 * We double it on the way in to account for
		 * "struct sk_buff" etc. overhead.   Applications
		 * assume that the SO_RCVBUF setting they make will
		 * allow that much actual data to be received on that
		 * socket.
		 *
		 * Applications are unaware that "struct sk_buff" and
		 * other overheads allocate from the receive buffer
		 * during socket buffer allocation.
		 *
		 * And after considering the possible alternatives,
		 * returning the value we actually used in getsockopt
		 * is the most desirable behavior.
		 */
		if ((val * 2) < SOCK_MIN_RCVBUF)
			sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
		else
			sk->sk_rcvbuf = val * 2;
		break;

	case SO_RCVBUFFORCE:
		if (!capable(CAP_NET_ADMIN)) {
			ret = -EPERM;
L
Linus Torvalds 已提交
559
			break;
560 561
		}
		goto set_rcvbuf;
L
Linus Torvalds 已提交
562

563
	case SO_KEEPALIVE:
L
Linus Torvalds 已提交
564
#ifdef CONFIG_INET
565 566
		if (sk->sk_protocol == IPPROTO_TCP)
			tcp_set_keepalive(sk, valbool);
L
Linus Torvalds 已提交
567
#endif
568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588
		sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
		break;

	case SO_OOBINLINE:
		sock_valbool_flag(sk, SOCK_URGINLINE, valbool);
		break;

	case SO_NO_CHECK:
		sk->sk_no_check = valbool;
		break;

	case SO_PRIORITY:
		if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN))
			sk->sk_priority = val;
		else
			ret = -EPERM;
		break;

	case SO_LINGER:
		if (optlen < sizeof(ling)) {
			ret = -EINVAL;	/* 1003.1g */
L
Linus Torvalds 已提交
589
			break;
590
		}
E
Eric Dumazet 已提交
591
		if (copy_from_user(&ling, optval, sizeof(ling))) {
592
			ret = -EFAULT;
L
Linus Torvalds 已提交
593
			break;
594 595 596 597
		}
		if (!ling.l_onoff)
			sock_reset_flag(sk, SOCK_LINGER);
		else {
L
Linus Torvalds 已提交
598
#if (BITS_PER_LONG == 32)
599 600
			if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
				sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
L
Linus Torvalds 已提交
601
			else
602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619
#endif
				sk->sk_lingertime = (unsigned int)ling.l_linger * HZ;
			sock_set_flag(sk, SOCK_LINGER);
		}
		break;

	case SO_BSDCOMPAT:
		sock_warn_obsolete_bsdism("setsockopt");
		break;

	case SO_PASSCRED:
		if (valbool)
			set_bit(SOCK_PASSCRED, &sock->flags);
		else
			clear_bit(SOCK_PASSCRED, &sock->flags);
		break;

	case SO_TIMESTAMP:
620
	case SO_TIMESTAMPNS:
621
		if (valbool)  {
622 623 624 625
			if (optname == SO_TIMESTAMP)
				sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
			else
				sock_set_flag(sk, SOCK_RCVTSTAMPNS);
626
			sock_set_flag(sk, SOCK_RCVTSTAMP);
627
			sock_enable_timestamp(sk, SOCK_TIMESTAMP);
628
		} else {
629
			sock_reset_flag(sk, SOCK_RCVTSTAMP);
630 631
			sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
		}
632 633
		break;

634 635
	case SO_TIMESTAMPING:
		if (val & ~SOF_TIMESTAMPING_MASK) {
636
			ret = -EINVAL;
637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658
			break;
		}
		sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE,
				  val & SOF_TIMESTAMPING_TX_HARDWARE);
		sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE,
				  val & SOF_TIMESTAMPING_TX_SOFTWARE);
		sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE,
				  val & SOF_TIMESTAMPING_RX_HARDWARE);
		if (val & SOF_TIMESTAMPING_RX_SOFTWARE)
			sock_enable_timestamp(sk,
					      SOCK_TIMESTAMPING_RX_SOFTWARE);
		else
			sock_disable_timestamp(sk,
					       SOCK_TIMESTAMPING_RX_SOFTWARE);
		sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE,
				  val & SOF_TIMESTAMPING_SOFTWARE);
		sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE,
				  val & SOF_TIMESTAMPING_SYS_HARDWARE);
		sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE,
				  val & SOF_TIMESTAMPING_RAW_HARDWARE);
		break;

659 660 661 662 663 664 665 666 667 668 669 670 671
	case SO_RCVLOWAT:
		if (val < 0)
			val = INT_MAX;
		sk->sk_rcvlowat = val ? : 1;
		break;

	case SO_RCVTIMEO:
		ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen);
		break;

	case SO_SNDTIMEO:
		ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen);
		break;
L
Linus Torvalds 已提交
672

673 674 675 676
	case SO_ATTACH_FILTER:
		ret = -EINVAL;
		if (optlen == sizeof(struct sock_fprog)) {
			struct sock_fprog fprog;
L
Linus Torvalds 已提交
677

678 679
			ret = -EFAULT;
			if (copy_from_user(&fprog, optval, sizeof(fprog)))
L
Linus Torvalds 已提交
680
				break;
681 682 683 684 685 686

			ret = sk_attach_filter(&fprog, sk);
		}
		break;

	case SO_DETACH_FILTER:
687
		ret = sk_detach_filter(sk);
688
		break;
L
Linus Torvalds 已提交
689

690 691 692 693 694 695
	case SO_PASSSEC:
		if (valbool)
			set_bit(SOCK_PASSSEC, &sock->flags);
		else
			clear_bit(SOCK_PASSSEC, &sock->flags);
		break;
696 697 698
	case SO_MARK:
		if (!capable(CAP_NET_ADMIN))
			ret = -EPERM;
E
Eric Dumazet 已提交
699
		else
700 701
			sk->sk_mark = val;
		break;
C
Catherine Zhang 已提交
702

L
Linus Torvalds 已提交
703 704
		/* We implement the SO_SNDLOWAT etc to
		   not be settable (1003.1g 5.3) */
705 706 707
	default:
		ret = -ENOPROTOOPT;
		break;
708
	}
L
Linus Torvalds 已提交
709 710 711
	release_sock(sk);
	return ret;
}
E
Eric Dumazet 已提交
712
EXPORT_SYMBOL(sock_setsockopt);
L
Linus Torvalds 已提交
713 714 715 716 717 718


int sock_getsockopt(struct socket *sock, int level, int optname,
		    char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
719

720
	union {
721 722
		int val;
		struct linger ling;
L
Linus Torvalds 已提交
723 724
		struct timeval tm;
	} v;
725

L
Linus Torvalds 已提交
726 727
	unsigned int lv = sizeof(int);
	int len;
728

729
	if (get_user(len, optlen))
730
		return -EFAULT;
731
	if (len < 0)
L
Linus Torvalds 已提交
732
		return -EINVAL;
733

734
	memset(&v, 0, sizeof(v));
735

E
Eric Dumazet 已提交
736
	switch (optname) {
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768
	case SO_DEBUG:
		v.val = sock_flag(sk, SOCK_DBG);
		break;

	case SO_DONTROUTE:
		v.val = sock_flag(sk, SOCK_LOCALROUTE);
		break;

	case SO_BROADCAST:
		v.val = !!sock_flag(sk, SOCK_BROADCAST);
		break;

	case SO_SNDBUF:
		v.val = sk->sk_sndbuf;
		break;

	case SO_RCVBUF:
		v.val = sk->sk_rcvbuf;
		break;

	case SO_REUSEADDR:
		v.val = sk->sk_reuse;
		break;

	case SO_KEEPALIVE:
		v.val = !!sock_flag(sk, SOCK_KEEPOPEN);
		break;

	case SO_TYPE:
		v.val = sk->sk_type;
		break;

769 770 771 772
	case SO_PROTOCOL:
		v.val = sk->sk_protocol;
		break;

773 774 775 776
	case SO_DOMAIN:
		v.val = sk->sk_family;
		break;

777 778
	case SO_ERROR:
		v.val = -sock_error(sk);
E
Eric Dumazet 已提交
779
		if (v.val == 0)
780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805
			v.val = xchg(&sk->sk_err_soft, 0);
		break;

	case SO_OOBINLINE:
		v.val = !!sock_flag(sk, SOCK_URGINLINE);
		break;

	case SO_NO_CHECK:
		v.val = sk->sk_no_check;
		break;

	case SO_PRIORITY:
		v.val = sk->sk_priority;
		break;

	case SO_LINGER:
		lv		= sizeof(v.ling);
		v.ling.l_onoff	= !!sock_flag(sk, SOCK_LINGER);
		v.ling.l_linger	= sk->sk_lingertime / HZ;
		break;

	case SO_BSDCOMPAT:
		sock_warn_obsolete_bsdism("getsockopt");
		break;

	case SO_TIMESTAMP:
806 807 808 809 810 811
		v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
				!sock_flag(sk, SOCK_RCVTSTAMPNS);
		break;

	case SO_TIMESTAMPNS:
		v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
812 813
		break;

814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831
	case SO_TIMESTAMPING:
		v.val = 0;
		if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE))
			v.val |= SOF_TIMESTAMPING_TX_HARDWARE;
		if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE))
			v.val |= SOF_TIMESTAMPING_TX_SOFTWARE;
		if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE))
			v.val |= SOF_TIMESTAMPING_RX_HARDWARE;
		if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE))
			v.val |= SOF_TIMESTAMPING_RX_SOFTWARE;
		if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE))
			v.val |= SOF_TIMESTAMPING_SOFTWARE;
		if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE))
			v.val |= SOF_TIMESTAMPING_SYS_HARDWARE;
		if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE))
			v.val |= SOF_TIMESTAMPING_RAW_HARDWARE;
		break;

832
	case SO_RCVTIMEO:
E
Eric Dumazet 已提交
833
		lv = sizeof(struct timeval);
834 835 836 837 838 839 840 841 842 843
		if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) {
			v.tm.tv_sec = 0;
			v.tm.tv_usec = 0;
		} else {
			v.tm.tv_sec = sk->sk_rcvtimeo / HZ;
			v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ;
		}
		break;

	case SO_SNDTIMEO:
E
Eric Dumazet 已提交
844
		lv = sizeof(struct timeval);
845 846 847 848 849 850 851 852
		if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) {
			v.tm.tv_sec = 0;
			v.tm.tv_usec = 0;
		} else {
			v.tm.tv_sec = sk->sk_sndtimeo / HZ;
			v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ;
		}
		break;
L
Linus Torvalds 已提交
853

854 855 856
	case SO_RCVLOWAT:
		v.val = sk->sk_rcvlowat;
		break;
L
Linus Torvalds 已提交
857

858
	case SO_SNDLOWAT:
E
Eric Dumazet 已提交
859
		v.val = 1;
860
		break;
L
Linus Torvalds 已提交
861

862 863 864
	case SO_PASSCRED:
		v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
		break;
L
Linus Torvalds 已提交
865

866 867 868 869 870 871
	case SO_PEERCRED:
		if (len > sizeof(sk->sk_peercred))
			len = sizeof(sk->sk_peercred);
		if (copy_to_user(optval, &sk->sk_peercred, len))
			return -EFAULT;
		goto lenout;
L
Linus Torvalds 已提交
872

873 874 875 876 877 878 879 880 881 882 883 884
	case SO_PEERNAME:
	{
		char address[128];

		if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2))
			return -ENOTCONN;
		if (lv < len)
			return -EINVAL;
		if (copy_to_user(optval, address, len))
			return -EFAULT;
		goto lenout;
	}
L
Linus Torvalds 已提交
885

886 887 888 889 890 891
	/* Dubious BSD thing... Probably nobody even uses it, but
	 * the UNIX standard wants it for whatever reason... -DaveM
	 */
	case SO_ACCEPTCONN:
		v.val = sk->sk_state == TCP_LISTEN;
		break;
L
Linus Torvalds 已提交
892

893 894 895
	case SO_PASSSEC:
		v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
		break;
C
Catherine Zhang 已提交
896

897 898
	case SO_PEERSEC:
		return security_socket_getpeersec_stream(sock, optval, optlen, len);
L
Linus Torvalds 已提交
899

900 901 902 903
	case SO_MARK:
		v.val = sk->sk_mark;
		break;

904 905
	default:
		return -ENOPROTOOPT;
L
Linus Torvalds 已提交
906
	}
907

L
Linus Torvalds 已提交
908 909 910 911 912
	if (len > lv)
		len = lv;
	if (copy_to_user(optval, &v, len))
		return -EFAULT;
lenout:
913 914 915
	if (put_user(len, optlen))
		return -EFAULT;
	return 0;
L
Linus Torvalds 已提交
916 917
}

I
Ingo Molnar 已提交
918 919 920 921 922
/*
 * Initialize an sk_lock.
 *
 * (We also register the sk_lock with the lock validator.)
 */
D
Dave Jones 已提交
923
static inline void sock_lock_init(struct sock *sk)
I
Ingo Molnar 已提交
924
{
925 926 927 928 929
	sock_lock_init_class_and_name(sk,
			af_family_slock_key_strings[sk->sk_family],
			af_family_slock_keys + sk->sk_family,
			af_family_key_strings[sk->sk_family],
			af_family_keys + sk->sk_family);
I
Ingo Molnar 已提交
930 931
}

E
Eric Dumazet 已提交
932 933 934 935
/*
 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet,
 * even temporarly, because of RCU lookups. sk_node should also be left as is.
 */
936 937 938 939 940
static void sock_copy(struct sock *nsk, const struct sock *osk)
{
#ifdef CONFIG_SECURITY_NETWORK
	void *sptr = nsk->sk_security;
#endif
E
Eric Dumazet 已提交
941 942 943 944
	BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
		     sizeof(osk->sk_node) + sizeof(osk->sk_refcnt));
	memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
	       osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
945 946 947 948 949 950
#ifdef CONFIG_SECURITY_NETWORK
	nsk->sk_security = sptr;
	security_sk_clone(osk, nsk);
#endif
}

951 952
static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
		int family)
953 954 955 956 957
{
	struct sock *sk;
	struct kmem_cache *slab;

	slab = prot->slab;
958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974
	if (slab != NULL) {
		sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO);
		if (!sk)
			return sk;
		if (priority & __GFP_ZERO) {
			/*
			 * caches using SLAB_DESTROY_BY_RCU should let
			 * sk_node.next un-modified. Special care is taken
			 * when initializing object to zero.
			 */
			if (offsetof(struct sock, sk_node.next) != 0)
				memset(sk, 0, offsetof(struct sock, sk_node.next));
			memset(&sk->sk_node.pprev, 0,
			       prot->obj_size - offsetof(struct sock,
							 sk_node.pprev));
		}
	}
975 976 977
	else
		sk = kmalloc(prot->obj_size, priority);

978
	if (sk != NULL) {
979 980
		kmemcheck_annotate_bitfield(sk, flags);

981 982 983 984 985 986 987
		if (security_sk_alloc(sk, family, priority))
			goto out_free;

		if (!try_module_get(prot->owner))
			goto out_free_sec;
	}

988
	return sk;
989 990 991 992 993 994 995 996 997

out_free_sec:
	security_sk_free(sk);
out_free:
	if (slab != NULL)
		kmem_cache_free(slab, sk);
	else
		kfree(sk);
	return NULL;
998 999 1000 1001 1002
}

static void sk_prot_free(struct proto *prot, struct sock *sk)
{
	struct kmem_cache *slab;
1003
	struct module *owner;
1004

1005
	owner = prot->owner;
1006
	slab = prot->slab;
1007 1008

	security_sk_free(sk);
1009 1010 1011 1012
	if (slab != NULL)
		kmem_cache_free(slab, sk);
	else
		kfree(sk);
1013
	module_put(owner);
1014 1015
}

L
Linus Torvalds 已提交
1016 1017
/**
 *	sk_alloc - All socket objects are allocated here
1018
 *	@net: the applicable net namespace
1019 1020 1021
 *	@family: protocol family
 *	@priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
 *	@prot: struct proto associated with this new sock instance
L
Linus Torvalds 已提交
1022
 */
1023
struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1024
		      struct proto *prot)
L
Linus Torvalds 已提交
1025
{
1026
	struct sock *sk;
L
Linus Torvalds 已提交
1027

1028
	sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
L
Linus Torvalds 已提交
1029
	if (sk) {
1030 1031 1032 1033 1034 1035 1036
		sk->sk_family = family;
		/*
		 * See comment in struct sock definition to understand
		 * why we need sk_prot_creator -acme
		 */
		sk->sk_prot = sk->sk_prot_creator = prot;
		sock_lock_init(sk);
1037
		sock_net_set(sk, get_net(net));
1038
		atomic_set(&sk->sk_wmem_alloc, 1);
L
Linus Torvalds 已提交
1039
	}
1040

1041
	return sk;
L
Linus Torvalds 已提交
1042
}
E
Eric Dumazet 已提交
1043
EXPORT_SYMBOL(sk_alloc);
L
Linus Torvalds 已提交
1044

1045
static void __sk_free(struct sock *sk)
L
Linus Torvalds 已提交
1046 1047 1048 1049 1050 1051
{
	struct sk_filter *filter;

	if (sk->sk_destruct)
		sk->sk_destruct(sk);

1052
	filter = rcu_dereference(sk->sk_filter);
L
Linus Torvalds 已提交
1053
	if (filter) {
1054
		sk_filter_uncharge(sk, filter);
1055
		rcu_assign_pointer(sk->sk_filter, NULL);
L
Linus Torvalds 已提交
1056 1057
	}

1058 1059
	sock_disable_timestamp(sk, SOCK_TIMESTAMP);
	sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
L
Linus Torvalds 已提交
1060 1061 1062

	if (atomic_read(&sk->sk_omem_alloc))
		printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1063
		       __func__, atomic_read(&sk->sk_omem_alloc));
L
Linus Torvalds 已提交
1064

1065
	put_net(sock_net(sk));
1066
	sk_prot_free(sk->sk_prot_creator, sk);
L
Linus Torvalds 已提交
1067
}
1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078

void sk_free(struct sock *sk)
{
	/*
	 * We substract one from sk_wmem_alloc and can know if
	 * some packets are still in some tx queue.
	 * If not null, sock_wfree() will call __sk_free(sk) later
	 */
	if (atomic_dec_and_test(&sk->sk_wmem_alloc))
		__sk_free(sk);
}
E
Eric Dumazet 已提交
1079
EXPORT_SYMBOL(sk_free);
L
Linus Torvalds 已提交
1080

1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
/*
 * Last sock_put should drop referrence to sk->sk_net. It has already
 * been dropped in sk_change_net. Taking referrence to stopping namespace
 * is not an option.
 * Take referrence to a socket to remove it from hash _alive_ and after that
 * destroy it in the context of init_net.
 */
void sk_release_kernel(struct sock *sk)
{
	if (sk == NULL || sk->sk_socket == NULL)
		return;

	sock_hold(sk);
	sock_release(sk->sk_socket);
1095
	release_net(sock_net(sk));
1096
	sock_net_set(sk, get_net(&init_net));
1097 1098
	sock_put(sk);
}
1099
EXPORT_SYMBOL(sk_release_kernel);
1100

A
Al Viro 已提交
1101
struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
1102
{
1103
	struct sock *newsk;
1104

1105
	newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1106 1107 1108
	if (newsk != NULL) {
		struct sk_filter *filter;

1109
		sock_copy(newsk, sk);
1110 1111

		/* SANITY */
1112
		get_net(sock_net(newsk));
1113 1114 1115
		sk_node_init(&newsk->sk_node);
		sock_lock_init(newsk);
		bh_lock_sock(newsk);
1116
		newsk->sk_backlog.head	= newsk->sk_backlog.tail = NULL;
1117 1118

		atomic_set(&newsk->sk_rmem_alloc, 0);
1119 1120 1121 1122
		/*
		 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
		 */
		atomic_set(&newsk->sk_wmem_alloc, 1);
1123 1124 1125
		atomic_set(&newsk->sk_omem_alloc, 0);
		skb_queue_head_init(&newsk->sk_receive_queue);
		skb_queue_head_init(&newsk->sk_write_queue);
1126 1127 1128
#ifdef CONFIG_NET_DMA
		skb_queue_head_init(&newsk->sk_async_wait_queue);
#endif
1129 1130 1131

		rwlock_init(&newsk->sk_dst_lock);
		rwlock_init(&newsk->sk_callback_lock);
1132 1133 1134
		lockdep_set_class_and_name(&newsk->sk_callback_lock,
				af_callback_keys + newsk->sk_family,
				af_family_clock_key_strings[newsk->sk_family]);
1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159

		newsk->sk_dst_cache	= NULL;
		newsk->sk_wmem_queued	= 0;
		newsk->sk_forward_alloc = 0;
		newsk->sk_send_head	= NULL;
		newsk->sk_userlocks	= sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;

		sock_reset_flag(newsk, SOCK_DONE);
		skb_queue_head_init(&newsk->sk_error_queue);

		filter = newsk->sk_filter;
		if (filter != NULL)
			sk_filter_charge(newsk, filter);

		if (unlikely(xfrm_sk_clone_policy(newsk))) {
			/* It is still raw copy of parent, so invalidate
			 * destructor and make plain sk_free() */
			newsk->sk_destruct = NULL;
			sk_free(newsk);
			newsk = NULL;
			goto out;
		}

		newsk->sk_err	   = 0;
		newsk->sk_priority = 0;
E
Eric Dumazet 已提交
1160 1161 1162 1163 1164
		/*
		 * Before updating sk_refcnt, we must commit prior changes to memory
		 * (Documentation/RCU/rculist_nulls.txt for details)
		 */
		smp_wmb();
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178
		atomic_set(&newsk->sk_refcnt, 2);

		/*
		 * Increment the counter in the same struct proto as the master
		 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that
		 * is the same as sk->sk_prot->socks, as this field was copied
		 * with memcpy).
		 *
		 * This _changes_ the previous behaviour, where
		 * tcp_create_openreq_child always was incrementing the
		 * equivalent to tcp_prot->socks (inet_sock_nr), so this have
		 * to be taken into account in all callers. -acme
		 */
		sk_refcnt_debug_inc(newsk);
1179
		sk_set_socket(newsk, NULL);
1180 1181 1182
		newsk->sk_sleep	 = NULL;

		if (newsk->sk_prot->sockets_allocated)
1183
			percpu_counter_inc(newsk->sk_prot->sockets_allocated);
1184 1185 1186 1187 1188 1189
	}
out:
	return newsk;
}
EXPORT_SYMBOL_GPL(sk_clone);

1190 1191 1192 1193 1194
void sk_setup_caps(struct sock *sk, struct dst_entry *dst)
{
	__sk_dst_set(sk, dst);
	sk->sk_route_caps = dst->dev->features;
	if (sk->sk_route_caps & NETIF_F_GSO)
1195
		sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1196
	if (sk_can_gso(sk)) {
1197
		if (dst->header_len) {
1198
			sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1199
		} else {
1200
			sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1201 1202
			sk->sk_gso_max_size = dst->dev->gso_max_size;
		}
1203 1204 1205 1206
	}
}
EXPORT_SYMBOL_GPL(sk_setup_caps);

L
Linus Torvalds 已提交
1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224
void __init sk_init(void)
{
	if (num_physpages <= 4096) {
		sysctl_wmem_max = 32767;
		sysctl_rmem_max = 32767;
		sysctl_wmem_default = 32767;
		sysctl_rmem_default = 32767;
	} else if (num_physpages >= 131072) {
		sysctl_wmem_max = 131071;
		sysctl_rmem_max = 131071;
	}
}

/*
 *	Simple resource managers for sockets.
 */


1225 1226
/*
 * Write buffer destructor automatically called from kfree_skb.
L
Linus Torvalds 已提交
1227 1228 1229 1230
 */
void sock_wfree(struct sk_buff *skb)
{
	struct sock *sk = skb->sk;
1231
	int res;
L
Linus Torvalds 已提交
1232 1233

	/* In case it might be waiting for more memory. */
1234
	res = atomic_sub_return(skb->truesize, &sk->sk_wmem_alloc);
L
Linus Torvalds 已提交
1235 1236
	if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
		sk->sk_write_space(sk);
1237 1238 1239 1240 1241 1242
	/*
	 * if sk_wmem_alloc reached 0, we are last user and should
	 * free this sock, as sk_free() call could not do it.
	 */
	if (res == 0)
		__sk_free(sk);
L
Linus Torvalds 已提交
1243
}
E
Eric Dumazet 已提交
1244
EXPORT_SYMBOL(sock_wfree);
L
Linus Torvalds 已提交
1245

1246 1247
/*
 * Read buffer destructor automatically called from kfree_skb.
L
Linus Torvalds 已提交
1248 1249 1250 1251 1252 1253
 */
void sock_rfree(struct sk_buff *skb)
{
	struct sock *sk = skb->sk;

	atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1254
	sk_mem_uncharge(skb->sk, skb->truesize);
L
Linus Torvalds 已提交
1255
}
E
Eric Dumazet 已提交
1256
EXPORT_SYMBOL(sock_rfree);
L
Linus Torvalds 已提交
1257 1258 1259 1260 1261 1262 1263 1264 1265 1266 1267


int sock_i_uid(struct sock *sk)
{
	int uid;

	read_lock(&sk->sk_callback_lock);
	uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
	read_unlock(&sk->sk_callback_lock);
	return uid;
}
E
Eric Dumazet 已提交
1268
EXPORT_SYMBOL(sock_i_uid);
L
Linus Torvalds 已提交
1269 1270 1271 1272 1273 1274 1275 1276 1277 1278

unsigned long sock_i_ino(struct sock *sk)
{
	unsigned long ino;

	read_lock(&sk->sk_callback_lock);
	ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
	read_unlock(&sk->sk_callback_lock);
	return ino;
}
E
Eric Dumazet 已提交
1279
EXPORT_SYMBOL(sock_i_ino);
L
Linus Torvalds 已提交
1280 1281 1282 1283

/*
 * Allocate a skb from the socket's send buffer.
 */
V
Victor Fusco 已提交
1284
struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
A
Al Viro 已提交
1285
			     gfp_t priority)
L
Linus Torvalds 已提交
1286 1287
{
	if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
E
Eric Dumazet 已提交
1288
		struct sk_buff *skb = alloc_skb(size, priority);
L
Linus Torvalds 已提交
1289 1290 1291 1292 1293 1294 1295
		if (skb) {
			skb_set_owner_w(skb, sk);
			return skb;
		}
	}
	return NULL;
}
E
Eric Dumazet 已提交
1296
EXPORT_SYMBOL(sock_wmalloc);
L
Linus Torvalds 已提交
1297 1298 1299

/*
 * Allocate a skb from the socket's receive buffer.
1300
 */
V
Victor Fusco 已提交
1301
struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
A
Al Viro 已提交
1302
			     gfp_t priority)
L
Linus Torvalds 已提交
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313
{
	if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) {
		struct sk_buff *skb = alloc_skb(size, priority);
		if (skb) {
			skb_set_owner_r(skb, sk);
			return skb;
		}
	}
	return NULL;
}

1314
/*
L
Linus Torvalds 已提交
1315
 * Allocate a memory block from the socket's option memory buffer.
1316
 */
A
Al Viro 已提交
1317
void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
L
Linus Torvalds 已提交
1318 1319 1320 1321 1322
{
	if ((unsigned)size <= sysctl_optmem_max &&
	    atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) {
		void *mem;
		/* First do the add, to avoid the race if kmalloc
1323
		 * might sleep.
L
Linus Torvalds 已提交
1324 1325 1326 1327 1328 1329 1330 1331 1332
		 */
		atomic_add(size, &sk->sk_omem_alloc);
		mem = kmalloc(size, priority);
		if (mem)
			return mem;
		atomic_sub(size, &sk->sk_omem_alloc);
	}
	return NULL;
}
E
Eric Dumazet 已提交
1333
EXPORT_SYMBOL(sock_kmalloc);
L
Linus Torvalds 已提交
1334 1335 1336 1337 1338 1339 1340 1341 1342

/*
 * Free an option memory block.
 */
void sock_kfree_s(struct sock *sk, void *mem, int size)
{
	kfree(mem);
	atomic_sub(size, &sk->sk_omem_alloc);
}
E
Eric Dumazet 已提交
1343
EXPORT_SYMBOL(sock_kfree_s);
L
Linus Torvalds 已提交
1344 1345 1346 1347

/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
   I think, these locks should be removed for datagram sockets.
 */
E
Eric Dumazet 已提交
1348
static long sock_wait_for_wmem(struct sock *sk, long timeo)
L
Linus Torvalds 已提交
1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376
{
	DEFINE_WAIT(wait);

	clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
	for (;;) {
		if (!timeo)
			break;
		if (signal_pending(current))
			break;
		set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
		prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
		if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf)
			break;
		if (sk->sk_shutdown & SEND_SHUTDOWN)
			break;
		if (sk->sk_err)
			break;
		timeo = schedule_timeout(timeo);
	}
	finish_wait(sk->sk_sleep, &wait);
	return timeo;
}


/*
 *	Generic send/receive buffer handlers
 */

H
Herbert Xu 已提交
1377 1378 1379
struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
				     unsigned long data_len, int noblock,
				     int *errcode)
L
Linus Torvalds 已提交
1380 1381
{
	struct sk_buff *skb;
A
Al Viro 已提交
1382
	gfp_t gfp_mask;
L
Linus Torvalds 已提交
1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
	long timeo;
	int err;

	gfp_mask = sk->sk_allocation;
	if (gfp_mask & __GFP_WAIT)
		gfp_mask |= __GFP_REPEAT;

	timeo = sock_sndtimeo(sk, noblock);
	while (1) {
		err = sock_error(sk);
		if (err != 0)
			goto failure;

		err = -EPIPE;
		if (sk->sk_shutdown & SEND_SHUTDOWN)
			goto failure;

		if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
1401
			skb = alloc_skb(header_len, gfp_mask);
L
Linus Torvalds 已提交
1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458
			if (skb) {
				int npages;
				int i;

				/* No pages, we're done... */
				if (!data_len)
					break;

				npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
				skb->truesize += data_len;
				skb_shinfo(skb)->nr_frags = npages;
				for (i = 0; i < npages; i++) {
					struct page *page;
					skb_frag_t *frag;

					page = alloc_pages(sk->sk_allocation, 0);
					if (!page) {
						err = -ENOBUFS;
						skb_shinfo(skb)->nr_frags = i;
						kfree_skb(skb);
						goto failure;
					}

					frag = &skb_shinfo(skb)->frags[i];
					frag->page = page;
					frag->page_offset = 0;
					frag->size = (data_len >= PAGE_SIZE ?
						      PAGE_SIZE :
						      data_len);
					data_len -= PAGE_SIZE;
				}

				/* Full success... */
				break;
			}
			err = -ENOBUFS;
			goto failure;
		}
		set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
		set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
		err = -EAGAIN;
		if (!timeo)
			goto failure;
		if (signal_pending(current))
			goto interrupted;
		timeo = sock_wait_for_wmem(sk, timeo);
	}

	skb_set_owner_w(skb, sk);
	return skb;

interrupted:
	err = sock_intr_errno(timeo);
failure:
	*errcode = err;
	return NULL;
}
H
Herbert Xu 已提交
1459
EXPORT_SYMBOL(sock_alloc_send_pskb);
L
Linus Torvalds 已提交
1460

1461
struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
L
Linus Torvalds 已提交
1462 1463 1464 1465
				    int noblock, int *errcode)
{
	return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
}
E
Eric Dumazet 已提交
1466
EXPORT_SYMBOL(sock_alloc_send_skb);
L
Linus Torvalds 已提交
1467 1468 1469 1470 1471

static void __lock_sock(struct sock *sk)
{
	DEFINE_WAIT(wait);

1472
	for (;;) {
L
Linus Torvalds 已提交
1473 1474 1475 1476 1477
		prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait,
					TASK_UNINTERRUPTIBLE);
		spin_unlock_bh(&sk->sk_lock.slock);
		schedule();
		spin_lock_bh(&sk->sk_lock.slock);
1478
		if (!sock_owned_by_user(sk))
L
Linus Torvalds 已提交
1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495
			break;
	}
	finish_wait(&sk->sk_lock.wq, &wait);
}

static void __release_sock(struct sock *sk)
{
	struct sk_buff *skb = sk->sk_backlog.head;

	do {
		sk->sk_backlog.head = sk->sk_backlog.tail = NULL;
		bh_unlock_sock(sk);

		do {
			struct sk_buff *next = skb->next;

			skb->next = NULL;
P
Peter Zijlstra 已提交
1496
			sk_backlog_rcv(sk, skb);
L
Linus Torvalds 已提交
1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509

			/*
			 * We are in process context here with softirqs
			 * disabled, use cond_resched_softirq() to preempt.
			 * This is safe to do because we've taken the backlog
			 * queue private:
			 */
			cond_resched_softirq();

			skb = next;
		} while (skb != NULL);

		bh_lock_sock(sk);
1510
	} while ((skb = sk->sk_backlog.head) != NULL);
L
Linus Torvalds 已提交
1511 1512 1513 1514
}

/**
 * sk_wait_data - wait for data to arrive at sk_receive_queue
1515 1516
 * @sk:    sock to wait on
 * @timeo: for how long
L
Linus Torvalds 已提交
1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536
 *
 * Now socket state including sk->sk_err is changed only under lock,
 * hence we may omit checks after joining wait queue.
 * We check receive queue before schedule() only as optimization;
 * it is very likely that release_sock() added new data.
 */
int sk_wait_data(struct sock *sk, long *timeo)
{
	int rc;
	DEFINE_WAIT(wait);

	prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
	set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
	rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue));
	clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags);
	finish_wait(sk->sk_sleep, &wait);
	return rc;
}
EXPORT_SYMBOL(sk_wait_data);

1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
/**
 *	__sk_mem_schedule - increase sk_forward_alloc and memory_allocated
 *	@sk: socket
 *	@size: memory size to allocate
 *	@kind: allocation type
 *
 *	If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means
 *	rmem allocation. This function assumes that protocols which have
 *	memory_pressure use sk_wmem_queued as write buffer accounting.
 */
int __sk_mem_schedule(struct sock *sk, int size, int kind)
{
	struct proto *prot = sk->sk_prot;
	int amt = sk_mem_pages(size);
	int allocated;

	sk->sk_forward_alloc += amt * SK_MEM_QUANTUM;
	allocated = atomic_add_return(amt, prot->memory_allocated);

	/* Under limit. */
	if (allocated <= prot->sysctl_mem[0]) {
		if (prot->memory_pressure && *prot->memory_pressure)
			*prot->memory_pressure = 0;
		return 1;
	}

	/* Under pressure. */
	if (allocated > prot->sysctl_mem[1])
		if (prot->enter_memory_pressure)
1566
			prot->enter_memory_pressure(sk);
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585

	/* Over hard limit. */
	if (allocated > prot->sysctl_mem[2])
		goto suppress_allocation;

	/* guarantee minimum buffer size under pressure */
	if (kind == SK_MEM_RECV) {
		if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0])
			return 1;
	} else { /* SK_MEM_SEND */
		if (sk->sk_type == SOCK_STREAM) {
			if (sk->sk_wmem_queued < prot->sysctl_wmem[0])
				return 1;
		} else if (atomic_read(&sk->sk_wmem_alloc) <
			   prot->sysctl_wmem[0])
				return 1;
	}

	if (prot->memory_pressure) {
1586 1587 1588 1589 1590 1591
		int alloc;

		if (!*prot->memory_pressure)
			return 1;
		alloc = percpu_counter_read_positive(prot->sockets_allocated);
		if (prot->sysctl_mem[2] > alloc *
1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624
		    sk_mem_pages(sk->sk_wmem_queued +
				 atomic_read(&sk->sk_rmem_alloc) +
				 sk->sk_forward_alloc))
			return 1;
	}

suppress_allocation:

	if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) {
		sk_stream_moderate_sndbuf(sk);

		/* Fail only if socket is _under_ its sndbuf.
		 * In this case we cannot block, so that we have to fail.
		 */
		if (sk->sk_wmem_queued + size >= sk->sk_sndbuf)
			return 1;
	}

	/* Alas. Undo changes. */
	sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM;
	atomic_sub(amt, prot->memory_allocated);
	return 0;
}
EXPORT_SYMBOL(__sk_mem_schedule);

/**
 *	__sk_reclaim - reclaim memory_allocated
 *	@sk: socket
 */
void __sk_mem_reclaim(struct sock *sk)
{
	struct proto *prot = sk->sk_prot;

1625
	atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
		   prot->memory_allocated);
	sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1;

	if (prot->memory_pressure && *prot->memory_pressure &&
	    (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0]))
		*prot->memory_pressure = 0;
}
EXPORT_SYMBOL(__sk_mem_reclaim);


L
Linus Torvalds 已提交
1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646
/*
 * Set of default routines for initialising struct proto_ops when
 * the protocol does not support a particular function. In certain
 * cases where it makes no sense for a protocol to have a "do nothing"
 * function, some default processing is provided.
 */

int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1647
EXPORT_SYMBOL(sock_no_bind);
L
Linus Torvalds 已提交
1648

1649
int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
L
Linus Torvalds 已提交
1650 1651 1652 1653
		    int len, int flags)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1654
EXPORT_SYMBOL(sock_no_connect);
L
Linus Torvalds 已提交
1655 1656 1657 1658 1659

int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1660
EXPORT_SYMBOL(sock_no_socketpair);
L
Linus Torvalds 已提交
1661 1662 1663 1664 1665

int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1666
EXPORT_SYMBOL(sock_no_accept);
L
Linus Torvalds 已提交
1667

1668
int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
L
Linus Torvalds 已提交
1669 1670 1671 1672
		    int *len, int peer)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1673
EXPORT_SYMBOL(sock_no_getname);
L
Linus Torvalds 已提交
1674

E
Eric Dumazet 已提交
1675
unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
L
Linus Torvalds 已提交
1676 1677 1678
{
	return 0;
}
E
Eric Dumazet 已提交
1679
EXPORT_SYMBOL(sock_no_poll);
L
Linus Torvalds 已提交
1680 1681 1682 1683 1684

int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1685
EXPORT_SYMBOL(sock_no_ioctl);
L
Linus Torvalds 已提交
1686 1687 1688 1689 1690

int sock_no_listen(struct socket *sock, int backlog)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1691
EXPORT_SYMBOL(sock_no_listen);
L
Linus Torvalds 已提交
1692 1693 1694 1695 1696

int sock_no_shutdown(struct socket *sock, int how)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1697
EXPORT_SYMBOL(sock_no_shutdown);
L
Linus Torvalds 已提交
1698 1699 1700 1701 1702 1703

int sock_no_setsockopt(struct socket *sock, int level, int optname,
		    char __user *optval, int optlen)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1704
EXPORT_SYMBOL(sock_no_setsockopt);
L
Linus Torvalds 已提交
1705 1706 1707 1708 1709 1710

int sock_no_getsockopt(struct socket *sock, int level, int optname,
		    char __user *optval, int __user *optlen)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1711
EXPORT_SYMBOL(sock_no_getsockopt);
L
Linus Torvalds 已提交
1712 1713 1714 1715 1716 1717

int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
		    size_t len)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1718
EXPORT_SYMBOL(sock_no_sendmsg);
L
Linus Torvalds 已提交
1719 1720 1721 1722 1723 1724

int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
		    size_t len, int flags)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1725
EXPORT_SYMBOL(sock_no_recvmsg);
L
Linus Torvalds 已提交
1726 1727 1728 1729 1730 1731

int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
{
	/* Mirror missing mmap method error code */
	return -ENODEV;
}
E
Eric Dumazet 已提交
1732
EXPORT_SYMBOL(sock_no_mmap);
L
Linus Torvalds 已提交
1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745

ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags)
{
	ssize_t res;
	struct msghdr msg = {.msg_flags = flags};
	struct kvec iov;
	char *kaddr = kmap(page);
	iov.iov_base = kaddr + offset;
	iov.iov_len = size;
	res = kernel_sendmsg(sock, &msg, &iov, 1, size);
	kunmap(page);
	return res;
}
E
Eric Dumazet 已提交
1746
EXPORT_SYMBOL(sock_no_sendpage);
L
Linus Torvalds 已提交
1747 1748 1749 1750 1751 1752 1753 1754

/*
 *	Default Socket Callbacks
 */

static void sock_def_wakeup(struct sock *sk)
{
	read_lock(&sk->sk_callback_lock);
1755
	if (sk_has_sleeper(sk))
L
Linus Torvalds 已提交
1756 1757 1758 1759 1760 1761 1762
		wake_up_interruptible_all(sk->sk_sleep);
	read_unlock(&sk->sk_callback_lock);
}

static void sock_def_error_report(struct sock *sk)
{
	read_lock(&sk->sk_callback_lock);
1763
	if (sk_has_sleeper(sk))
1764
		wake_up_interruptible_poll(sk->sk_sleep, POLLERR);
1765
	sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
L
Linus Torvalds 已提交
1766 1767 1768 1769 1770 1771
	read_unlock(&sk->sk_callback_lock);
}

static void sock_def_readable(struct sock *sk, int len)
{
	read_lock(&sk->sk_callback_lock);
1772
	if (sk_has_sleeper(sk))
1773 1774
		wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN |
						POLLRDNORM | POLLRDBAND);
1775
	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
L
Linus Torvalds 已提交
1776 1777 1778 1779 1780 1781 1782 1783 1784 1785
	read_unlock(&sk->sk_callback_lock);
}

static void sock_def_write_space(struct sock *sk)
{
	read_lock(&sk->sk_callback_lock);

	/* Do not wake up a writer until he can make "significant"
	 * progress.  --DaveM
	 */
1786
	if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1787
		if (sk_has_sleeper(sk))
1788 1789
			wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT |
						POLLWRNORM | POLLWRBAND);
L
Linus Torvalds 已提交
1790 1791 1792

		/* Should agree with poll, otherwise some programs break */
		if (sock_writeable(sk))
1793
			sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
L
Linus Torvalds 已提交
1794 1795 1796 1797 1798 1799 1800
	}

	read_unlock(&sk->sk_callback_lock);
}

static void sock_def_destruct(struct sock *sk)
{
J
Jesper Juhl 已提交
1801
	kfree(sk->sk_protinfo);
L
Linus Torvalds 已提交
1802 1803 1804 1805 1806 1807
}

void sk_send_sigurg(struct sock *sk)
{
	if (sk->sk_socket && sk->sk_socket->file)
		if (send_sigurg(&sk->sk_socket->file->f_owner))
1808
			sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
L
Linus Torvalds 已提交
1809
}
E
Eric Dumazet 已提交
1810
EXPORT_SYMBOL(sk_send_sigurg);
L
Linus Torvalds 已提交
1811 1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831

void sk_reset_timer(struct sock *sk, struct timer_list* timer,
		    unsigned long expires)
{
	if (!mod_timer(timer, expires))
		sock_hold(sk);
}
EXPORT_SYMBOL(sk_reset_timer);

void sk_stop_timer(struct sock *sk, struct timer_list* timer)
{
	if (timer_pending(timer) && del_timer(timer))
		__sock_put(sk);
}
EXPORT_SYMBOL(sk_stop_timer);

void sock_init_data(struct socket *sock, struct sock *sk)
{
	skb_queue_head_init(&sk->sk_receive_queue);
	skb_queue_head_init(&sk->sk_write_queue);
	skb_queue_head_init(&sk->sk_error_queue);
1832 1833 1834
#ifdef CONFIG_NET_DMA
	skb_queue_head_init(&sk->sk_async_wait_queue);
#endif
L
Linus Torvalds 已提交
1835 1836 1837 1838

	sk->sk_send_head	=	NULL;

	init_timer(&sk->sk_timer);
1839

L
Linus Torvalds 已提交
1840 1841 1842 1843
	sk->sk_allocation	=	GFP_KERNEL;
	sk->sk_rcvbuf		=	sysctl_rmem_default;
	sk->sk_sndbuf		=	sysctl_wmem_default;
	sk->sk_state		=	TCP_CLOSE;
1844
	sk_set_socket(sk, sock);
L
Linus Torvalds 已提交
1845 1846 1847

	sock_set_flag(sk, SOCK_ZAPPED);

1848
	if (sock) {
L
Linus Torvalds 已提交
1849 1850 1851 1852 1853 1854 1855 1856
		sk->sk_type	=	sock->type;
		sk->sk_sleep	=	&sock->wait;
		sock->sk	=	sk;
	} else
		sk->sk_sleep	=	NULL;

	rwlock_init(&sk->sk_dst_lock);
	rwlock_init(&sk->sk_callback_lock);
1857 1858 1859
	lockdep_set_class_and_name(&sk->sk_callback_lock,
			af_callback_keys + sk->sk_family,
			af_family_clock_key_strings[sk->sk_family]);
L
Linus Torvalds 已提交
1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877

	sk->sk_state_change	=	sock_def_wakeup;
	sk->sk_data_ready	=	sock_def_readable;
	sk->sk_write_space	=	sock_def_write_space;
	sk->sk_error_report	=	sock_def_error_report;
	sk->sk_destruct		=	sock_def_destruct;

	sk->sk_sndmsg_page	=	NULL;
	sk->sk_sndmsg_off	=	0;

	sk->sk_peercred.pid 	=	0;
	sk->sk_peercred.uid	=	-1;
	sk->sk_peercred.gid	=	-1;
	sk->sk_write_pending	=	0;
	sk->sk_rcvlowat		=	1;
	sk->sk_rcvtimeo		=	MAX_SCHEDULE_TIMEOUT;
	sk->sk_sndtimeo		=	MAX_SCHEDULE_TIMEOUT;

1878
	sk->sk_stamp = ktime_set(-1L, 0);
L
Linus Torvalds 已提交
1879

E
Eric Dumazet 已提交
1880 1881 1882 1883 1884
	/*
	 * Before updating sk_refcnt, we must commit prior changes to memory
	 * (Documentation/RCU/rculist_nulls.txt for details)
	 */
	smp_wmb();
L
Linus Torvalds 已提交
1885
	atomic_set(&sk->sk_refcnt, 1);
W
Wang Chen 已提交
1886
	atomic_set(&sk->sk_drops, 0);
L
Linus Torvalds 已提交
1887
}
E
Eric Dumazet 已提交
1888
EXPORT_SYMBOL(sock_init_data);
L
Linus Torvalds 已提交
1889

H
Harvey Harrison 已提交
1890
void lock_sock_nested(struct sock *sk, int subclass)
L
Linus Torvalds 已提交
1891 1892
{
	might_sleep();
I
Ingo Molnar 已提交
1893
	spin_lock_bh(&sk->sk_lock.slock);
1894
	if (sk->sk_lock.owned)
L
Linus Torvalds 已提交
1895
		__lock_sock(sk);
1896
	sk->sk_lock.owned = 1;
I
Ingo Molnar 已提交
1897 1898 1899 1900
	spin_unlock(&sk->sk_lock.slock);
	/*
	 * The sk_lock has mutex_lock() semantics here:
	 */
1901
	mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
I
Ingo Molnar 已提交
1902
	local_bh_enable();
L
Linus Torvalds 已提交
1903
}
1904
EXPORT_SYMBOL(lock_sock_nested);
L
Linus Torvalds 已提交
1905

H
Harvey Harrison 已提交
1906
void release_sock(struct sock *sk)
L
Linus Torvalds 已提交
1907
{
I
Ingo Molnar 已提交
1908 1909 1910 1911 1912 1913
	/*
	 * The sk_lock has mutex_unlock() semantics:
	 */
	mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);

	spin_lock_bh(&sk->sk_lock.slock);
L
Linus Torvalds 已提交
1914 1915
	if (sk->sk_backlog.tail)
		__release_sock(sk);
1916
	sk->sk_lock.owned = 0;
I
Ingo Molnar 已提交
1917 1918 1919
	if (waitqueue_active(&sk->sk_lock.wq))
		wake_up(&sk->sk_lock.wq);
	spin_unlock_bh(&sk->sk_lock.slock);
L
Linus Torvalds 已提交
1920 1921 1922 1923
}
EXPORT_SYMBOL(release_sock);

int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1924
{
1925
	struct timeval tv;
L
Linus Torvalds 已提交
1926
	if (!sock_flag(sk, SOCK_TIMESTAMP))
1927
		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
1928 1929
	tv = ktime_to_timeval(sk->sk_stamp);
	if (tv.tv_sec == -1)
L
Linus Torvalds 已提交
1930
		return -ENOENT;
1931 1932 1933 1934 1935
	if (tv.tv_sec == 0) {
		sk->sk_stamp = ktime_get_real();
		tv = ktime_to_timeval(sk->sk_stamp);
	}
	return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0;
1936
}
L
Linus Torvalds 已提交
1937 1938
EXPORT_SYMBOL(sock_get_timestamp);

1939 1940 1941 1942
int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
{
	struct timespec ts;
	if (!sock_flag(sk, SOCK_TIMESTAMP))
1943
		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954
	ts = ktime_to_timespec(sk->sk_stamp);
	if (ts.tv_sec == -1)
		return -ENOENT;
	if (ts.tv_sec == 0) {
		sk->sk_stamp = ktime_get_real();
		ts = ktime_to_timespec(sk->sk_stamp);
	}
	return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0;
}
EXPORT_SYMBOL(sock_get_timestampns);

1955
void sock_enable_timestamp(struct sock *sk, int flag)
1956
{
1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968
	if (!sock_flag(sk, flag)) {
		sock_set_flag(sk, flag);
		/*
		 * we just set one of the two flags which require net
		 * time stamping, but time stamping might have been on
		 * already because of the other one
		 */
		if (!sock_flag(sk,
				flag == SOCK_TIMESTAMP ?
				SOCK_TIMESTAMPING_RX_SOFTWARE :
				SOCK_TIMESTAMP))
			net_enable_timestamp();
L
Linus Torvalds 已提交
1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987
	}
}

/*
 *	Get a socket option on an socket.
 *
 *	FIX: POSIX 1003.1g is very ambiguous here. It states that
 *	asynchronous errors should be reported by getsockopt. We assume
 *	this means if you specify SO_ERROR (otherwise whats the point of it).
 */
int sock_common_getsockopt(struct socket *sock, int level, int optname,
			   char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;

	return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
}
EXPORT_SYMBOL(sock_common_getsockopt);

1988
#ifdef CONFIG_COMPAT
1989 1990
int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
				  char __user *optval, int __user *optlen)
1991 1992 1993
{
	struct sock *sk = sock->sk;

1994
	if (sk->sk_prot->compat_getsockopt != NULL)
1995 1996
		return sk->sk_prot->compat_getsockopt(sk, level, optname,
						      optval, optlen);
1997 1998 1999 2000 2001
	return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
}
EXPORT_SYMBOL(compat_sock_common_getsockopt);
#endif

L
Linus Torvalds 已提交
2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028
int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
			struct msghdr *msg, size_t size, int flags)
{
	struct sock *sk = sock->sk;
	int addr_len = 0;
	int err;

	err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
				   flags & ~MSG_DONTWAIT, &addr_len);
	if (err >= 0)
		msg->msg_namelen = addr_len;
	return err;
}
EXPORT_SYMBOL(sock_common_recvmsg);

/*
 *	Set socket options on an inet socket.
 */
int sock_common_setsockopt(struct socket *sock, int level, int optname,
			   char __user *optval, int optlen)
{
	struct sock *sk = sock->sk;

	return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
}
EXPORT_SYMBOL(sock_common_setsockopt);

2029
#ifdef CONFIG_COMPAT
2030 2031
int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
				  char __user *optval, int optlen)
2032 2033 2034
{
	struct sock *sk = sock->sk;

2035 2036 2037
	if (sk->sk_prot->compat_setsockopt != NULL)
		return sk->sk_prot->compat_setsockopt(sk, level, optname,
						      optval, optlen);
2038 2039 2040 2041 2042
	return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
}
EXPORT_SYMBOL(compat_sock_common_setsockopt);
#endif

L
Linus Torvalds 已提交
2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073
void sk_common_release(struct sock *sk)
{
	if (sk->sk_prot->destroy)
		sk->sk_prot->destroy(sk);

	/*
	 * Observation: when sock_common_release is called, processes have
	 * no access to socket. But net still has.
	 * Step one, detach it from networking:
	 *
	 * A. Remove from hash tables.
	 */

	sk->sk_prot->unhash(sk);

	/*
	 * In this point socket cannot receive new packets, but it is possible
	 * that some packets are in flight because some CPU runs receiver and
	 * did hash table lookup before we unhashed socket. They will achieve
	 * receive queue and will be purged by socket destructor.
	 *
	 * Also we still have packets pending on receive queue and probably,
	 * our own packets waiting in device queues. sock_destroy will drain
	 * receive queue, but transmitted packets will delay socket destruction
	 * until the last reference will be released.
	 */

	sock_orphan(sk);

	xfrm_sk_free_policy(sk);

2074
	sk_refcnt_debug_release(sk);
L
Linus Torvalds 已提交
2075 2076 2077 2078 2079 2080 2081
	sock_put(sk);
}
EXPORT_SYMBOL(sk_common_release);

static DEFINE_RWLOCK(proto_list_lock);
static LIST_HEAD(proto_list);

2082 2083
#ifdef CONFIG_PROC_FS
#define PROTO_INUSE_NR	64	/* should be enough for the first time */
2084 2085 2086
struct prot_inuse {
	int val[PROTO_INUSE_NR];
};
2087 2088

static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135

#ifdef CONFIG_NET_NS
void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
{
	int cpu = smp_processor_id();
	per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val;
}
EXPORT_SYMBOL_GPL(sock_prot_inuse_add);

int sock_prot_inuse_get(struct net *net, struct proto *prot)
{
	int cpu, idx = prot->inuse_idx;
	int res = 0;

	for_each_possible_cpu(cpu)
		res += per_cpu_ptr(net->core.inuse, cpu)->val[idx];

	return res >= 0 ? res : 0;
}
EXPORT_SYMBOL_GPL(sock_prot_inuse_get);

static int sock_inuse_init_net(struct net *net)
{
	net->core.inuse = alloc_percpu(struct prot_inuse);
	return net->core.inuse ? 0 : -ENOMEM;
}

static void sock_inuse_exit_net(struct net *net)
{
	free_percpu(net->core.inuse);
}

static struct pernet_operations net_inuse_ops = {
	.init = sock_inuse_init_net,
	.exit = sock_inuse_exit_net,
};

static __init int net_inuse_init(void)
{
	if (register_pernet_subsys(&net_inuse_ops))
		panic("Cannot initialize net inuse counters");

	return 0;
}

core_initcall(net_inuse_init);
#else
2136 2137
static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);

2138
void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2139 2140 2141 2142 2143
{
	__get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
}
EXPORT_SYMBOL_GPL(sock_prot_inuse_add);

2144
int sock_prot_inuse_get(struct net *net, struct proto *prot)
2145 2146 2147 2148 2149 2150 2151 2152 2153 2154
{
	int cpu, idx = prot->inuse_idx;
	int res = 0;

	for_each_possible_cpu(cpu)
		res += per_cpu(prot_inuse, cpu).val[idx];

	return res >= 0 ? res : 0;
}
EXPORT_SYMBOL_GPL(sock_prot_inuse_get);
2155
#endif
2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183

static void assign_proto_idx(struct proto *prot)
{
	prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR);

	if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) {
		printk(KERN_ERR "PROTO_INUSE_NR exhausted\n");
		return;
	}

	set_bit(prot->inuse_idx, proto_inuse_idx);
}

static void release_proto_idx(struct proto *prot)
{
	if (prot->inuse_idx != PROTO_INUSE_NR - 1)
		clear_bit(prot->inuse_idx, proto_inuse_idx);
}
#else
static inline void assign_proto_idx(struct proto *prot)
{
}

static inline void release_proto_idx(struct proto *prot)
{
}
#endif

2184 2185
int proto_register(struct proto *prot, int alloc_slab)
{
L
Linus Torvalds 已提交
2186 2187
	if (alloc_slab) {
		prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2188 2189
					SLAB_HWCACHE_ALIGN | prot->slab_flags,
					NULL);
L
Linus Torvalds 已提交
2190 2191 2192 2193

		if (prot->slab == NULL) {
			printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
			       prot->name);
2194
			goto out;
L
Linus Torvalds 已提交
2195
		}
2196 2197 2198 2199

		if (prot->rsk_prot != NULL) {
			static const char mask[] = "request_sock_%s";

2200 2201
			prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
			if (prot->rsk_prot->slab_name == NULL)
2202 2203
				goto out_free_sock_slab;

2204 2205
			sprintf(prot->rsk_prot->slab_name, mask, prot->name);
			prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2206
								 prot->rsk_prot->obj_size, 0,
2207
								 SLAB_HWCACHE_ALIGN, NULL);
2208 2209 2210 2211 2212 2213 2214

			if (prot->rsk_prot->slab == NULL) {
				printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n",
				       prot->name);
				goto out_free_request_sock_slab_name;
			}
		}
2215

2216
		if (prot->twsk_prot != NULL) {
2217 2218
			static const char mask[] = "tw_sock_%s";

2219
			prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL);
2220

2221
			if (prot->twsk_prot->twsk_slab_name == NULL)
2222 2223
				goto out_free_request_sock_slab;

2224
			sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name);
2225
			prot->twsk_prot->twsk_slab =
2226
				kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2227
						  prot->twsk_prot->twsk_obj_size,
2228 2229 2230
						  0,
						  SLAB_HWCACHE_ALIGN |
							prot->slab_flags,
2231
						  NULL);
2232
			if (prot->twsk_prot->twsk_slab == NULL)
2233 2234
				goto out_free_timewait_sock_slab_name;
		}
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	}

2237
	write_lock(&proto_list_lock);
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	list_add(&prot->node, &proto_list);
2239
	assign_proto_idx(prot);
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	write_unlock(&proto_list_lock);
2241 2242
	return 0;

2243
out_free_timewait_sock_slab_name:
2244
	kfree(prot->twsk_prot->twsk_slab_name);
2245 2246 2247 2248 2249
out_free_request_sock_slab:
	if (prot->rsk_prot && prot->rsk_prot->slab) {
		kmem_cache_destroy(prot->rsk_prot->slab);
		prot->rsk_prot->slab = NULL;
	}
2250
out_free_request_sock_slab_name:
2251
	kfree(prot->rsk_prot->slab_name);
2252 2253 2254
out_free_sock_slab:
	kmem_cache_destroy(prot->slab);
	prot->slab = NULL;
2255 2256
out:
	return -ENOBUFS;
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}
EXPORT_SYMBOL(proto_register);

void proto_unregister(struct proto *prot)
{
	write_lock(&proto_list_lock);
2263
	release_proto_idx(prot);
2264 2265
	list_del(&prot->node);
	write_unlock(&proto_list_lock);
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	if (prot->slab != NULL) {
		kmem_cache_destroy(prot->slab);
		prot->slab = NULL;
	}

2272 2273
	if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
		kmem_cache_destroy(prot->rsk_prot->slab);
2274
		kfree(prot->rsk_prot->slab_name);
2275 2276 2277
		prot->rsk_prot->slab = NULL;
	}

2278 2279
	if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
		kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2280
		kfree(prot->twsk_prot->twsk_slab_name);
2281
		prot->twsk_prot->twsk_slab = NULL;
2282
	}
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}
EXPORT_SYMBOL(proto_unregister);

#ifdef CONFIG_PROC_FS
static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2288
	__acquires(proto_list_lock)
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{
	read_lock(&proto_list_lock);
2291
	return seq_list_start_head(&proto_list, *pos);
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}

static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
2296
	return seq_list_next(v, &proto_list, pos);
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}

static void proto_seq_stop(struct seq_file *seq, void *v)
2300
	__releases(proto_list_lock)
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{
	read_unlock(&proto_list_lock);
}

static char proto_method_implemented(const void *method)
{
	return method == NULL ? 'n' : 'y';
}

static void proto_seq_printf(struct seq_file *seq, struct proto *proto)
{
	seq_printf(seq, "%-9s %4u %6d  %6d   %-3s %6u   %-3s  %-10s "
			"%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n",
		   proto->name,
		   proto->obj_size,
2316
		   sock_prot_inuse_get(seq_file_net(seq), proto),
L
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2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344
		   proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1,
		   proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI",
		   proto->max_header,
		   proto->slab == NULL ? "no" : "yes",
		   module_name(proto->owner),
		   proto_method_implemented(proto->close),
		   proto_method_implemented(proto->connect),
		   proto_method_implemented(proto->disconnect),
		   proto_method_implemented(proto->accept),
		   proto_method_implemented(proto->ioctl),
		   proto_method_implemented(proto->init),
		   proto_method_implemented(proto->destroy),
		   proto_method_implemented(proto->shutdown),
		   proto_method_implemented(proto->setsockopt),
		   proto_method_implemented(proto->getsockopt),
		   proto_method_implemented(proto->sendmsg),
		   proto_method_implemented(proto->recvmsg),
		   proto_method_implemented(proto->sendpage),
		   proto_method_implemented(proto->bind),
		   proto_method_implemented(proto->backlog_rcv),
		   proto_method_implemented(proto->hash),
		   proto_method_implemented(proto->unhash),
		   proto_method_implemented(proto->get_port),
		   proto_method_implemented(proto->enter_memory_pressure));
}

static int proto_seq_show(struct seq_file *seq, void *v)
{
2345
	if (v == &proto_list)
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		seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s",
			   "protocol",
			   "size",
			   "sockets",
			   "memory",
			   "press",
			   "maxhdr",
			   "slab",
			   "module",
			   "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n");
	else
2357
		proto_seq_printf(seq, list_entry(v, struct proto, node));
L
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2358 2359 2360
	return 0;
}

2361
static const struct seq_operations proto_seq_ops = {
L
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2362 2363 2364 2365 2366 2367 2368 2369
	.start  = proto_seq_start,
	.next   = proto_seq_next,
	.stop   = proto_seq_stop,
	.show   = proto_seq_show,
};

static int proto_seq_open(struct inode *inode, struct file *file)
{
2370 2371
	return seq_open_net(inode, file, &proto_seq_ops,
			    sizeof(struct seq_net_private));
L
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2372 2373
}

2374
static const struct file_operations proto_seq_fops = {
L
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2375 2376 2377 2378
	.owner		= THIS_MODULE,
	.open		= proto_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398
	.release	= seq_release_net,
};

static __net_init int proto_init_net(struct net *net)
{
	if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops))
		return -ENOMEM;

	return 0;
}

static __net_exit void proto_exit_net(struct net *net)
{
	proc_net_remove(net, "protocols");
}


static __net_initdata struct pernet_operations proto_net_ops = {
	.init = proto_init_net,
	.exit = proto_exit_net,
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};

static int __init proto_init(void)
{
2403
	return register_pernet_subsys(&proto_net_ops);
L
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}

subsys_initcall(proto_init);

#endif /* PROC_FS */