sock.c 63.7 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 <linux/user_namespace.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>
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#include <net/cls_cgroup.h>
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#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", "sk_lock-AF_CAIF" ,
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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", "slock-AF_CAIF" ,
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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", "clock-AF_CAIF" ,
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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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#if defined(CONFIG_CGROUPS) && !defined(CONFIG_NET_CLS_CGROUP)
int net_cls_subsys_id = -1;
EXPORT_SYMBOL_GPL(net_cls_subsys_id);
#endif

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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)
{
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	int err;
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	int skb_len;
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	unsigned long flags;
	struct sk_buff_head *list = &sk->sk_receive_queue;
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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) {
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		atomic_inc(&sk->sk_drops);
		return -ENOMEM;
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	}

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	err = sk_filter(sk, skb);
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	if (err)
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		return err;
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	if (!sk_rmem_schedule(sk, skb->truesize)) {
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		atomic_inc(&sk->sk_drops);
		return -ENOBUFS;
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	}

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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;

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	/* we escape from rcu protected region, make sure we dont leak
	 * a norefcounted dst
	 */
	skb_dst_force(skb);

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	spin_lock_irqsave(&list->lock, flags);
	skb->dropcount = atomic_read(&sk->sk_drops);
	__skb_queue_tail(list, skb);
	spin_unlock_irqrestore(&list->lock, flags);
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	if (!sock_flag(sk, SOCK_DEAD))
		sk->sk_data_ready(sk, skb_len);
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	return 0;
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}
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 (sk_rcvqueues_full(sk, skb)) {
		atomic_inc(&sk->sk_drops);
		goto discard_and_relse;
	}
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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_);
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	} else if (sk_add_backlog(sk, skb)) {
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		bh_unlock_sock(sk);
		atomic_inc(&sk->sk_drops);
		goto discard_and_relse;
	}

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	bh_unlock_sock(sk);
out:
	sock_put(sk);
	return rc;
discard_and_relse:
	kfree_skb(skb);
	goto out;
}
EXPORT_SYMBOL(sk_receive_skb);

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void sk_reset_txq(struct sock *sk)
{
	sk_tx_queue_clear(sk);
}
EXPORT_SYMBOL(sk_reset_txq);

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struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie)
{
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	struct dst_entry *dst = __sk_dst_get(sk);
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	if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
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		sk_tx_queue_clear(sk);
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		rcu_assign_pointer(sk->sk_dst_cache, NULL);
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		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;

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	index = 0;
	if (devname[0] != '\0') {
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		struct net_device *dev;
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		rcu_read_lock();
		dev = dev_get_by_name_rcu(net, devname);
		if (dev)
			index = dev->ifindex;
		rcu_read_unlock();
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		ret = -ENODEV;
		if (!dev)
			goto out;
	}

	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,
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		    char __user *optval, unsigned int optlen)
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{
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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);

E
Eric Dumazet 已提交
506
	switch (optname) {
507
	case SO_DEBUG:
E
Eric Dumazet 已提交
508
		if (val && !capable(CAP_NET_ADMIN))
509
			ret = -EACCES;
E
Eric Dumazet 已提交
510
		else
511
			sock_valbool_flag(sk, SOCK_DBG, valbool);
512 513 514 515 516
		break;
	case SO_REUSEADDR:
		sk->sk_reuse = valbool;
		break;
	case SO_TYPE:
517
	case SO_PROTOCOL:
518
	case SO_DOMAIN:
519 520 521 522
	case SO_ERROR:
		ret = -ENOPROTOOPT;
		break;
	case SO_DONTROUTE:
523
		sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
524 525 526 527 528 529 530 531 532 533 534 535
		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;
536
set_sndbuf:
537 538 539 540 541
		sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
		if ((val * 2) < SOCK_MIN_SNDBUF)
			sk->sk_sndbuf = SOCK_MIN_SNDBUF;
		else
			sk->sk_sndbuf = val * 2;
L
Linus Torvalds 已提交
542

543 544 545 546 547 548
		/*
		 *	Wake up sending tasks if we
		 *	upped the value.
		 */
		sk->sk_write_space(sk);
		break;
L
Linus Torvalds 已提交
549

550 551 552 553 554 555
	case SO_SNDBUFFORCE:
		if (!capable(CAP_NET_ADMIN)) {
			ret = -EPERM;
			break;
		}
		goto set_sndbuf;
556

557 558 559 560 561
	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 */
562

563 564
		if (val > sysctl_rmem_max)
			val = sysctl_rmem_max;
565
set_rcvbuf:
566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590
		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
591
			break;
592 593
		}
		goto set_rcvbuf;
L
Linus Torvalds 已提交
594

595
	case SO_KEEPALIVE:
L
Linus Torvalds 已提交
596
#ifdef CONFIG_INET
597 598
		if (sk->sk_protocol == IPPROTO_TCP)
			tcp_set_keepalive(sk, valbool);
L
Linus Torvalds 已提交
599
#endif
600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620
		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
621
			break;
622
		}
E
Eric Dumazet 已提交
623
		if (copy_from_user(&ling, optval, sizeof(ling))) {
624
			ret = -EFAULT;
L
Linus Torvalds 已提交
625
			break;
626 627 628 629
		}
		if (!ling.l_onoff)
			sock_reset_flag(sk, SOCK_LINGER);
		else {
L
Linus Torvalds 已提交
630
#if (BITS_PER_LONG == 32)
631 632
			if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
				sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
L
Linus Torvalds 已提交
633
			else
634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651
#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:
652
	case SO_TIMESTAMPNS:
653
		if (valbool)  {
654 655 656 657
			if (optname == SO_TIMESTAMP)
				sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
			else
				sock_set_flag(sk, SOCK_RCVTSTAMPNS);
658
			sock_set_flag(sk, SOCK_RCVTSTAMP);
659
			sock_enable_timestamp(sk, SOCK_TIMESTAMP);
660
		} else {
661
			sock_reset_flag(sk, SOCK_RCVTSTAMP);
662 663
			sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
		}
664 665
		break;

666 667
	case SO_TIMESTAMPING:
		if (val & ~SOF_TIMESTAMPING_MASK) {
668
			ret = -EINVAL;
669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690
			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;

691 692 693 694 695 696 697 698 699 700 701 702 703
	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
704

705 706 707 708
	case SO_ATTACH_FILTER:
		ret = -EINVAL;
		if (optlen == sizeof(struct sock_fprog)) {
			struct sock_fprog fprog;
L
Linus Torvalds 已提交
709

710 711
			ret = -EFAULT;
			if (copy_from_user(&fprog, optval, sizeof(fprog)))
L
Linus Torvalds 已提交
712
				break;
713 714 715 716 717 718

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

	case SO_DETACH_FILTER:
719
		ret = sk_detach_filter(sk);
720
		break;
L
Linus Torvalds 已提交
721

722 723 724 725 726 727
	case SO_PASSSEC:
		if (valbool)
			set_bit(SOCK_PASSSEC, &sock->flags);
		else
			clear_bit(SOCK_PASSSEC, &sock->flags);
		break;
728 729 730
	case SO_MARK:
		if (!capable(CAP_NET_ADMIN))
			ret = -EPERM;
E
Eric Dumazet 已提交
731
		else
732 733
			sk->sk_mark = val;
		break;
C
Catherine Zhang 已提交
734

L
Linus Torvalds 已提交
735 736
		/* We implement the SO_SNDLOWAT etc to
		   not be settable (1003.1g 5.3) */
737 738 739 740 741 742
	case SO_RXQ_OVFL:
		if (valbool)
			sock_set_flag(sk, SOCK_RXQ_OVFL);
		else
			sock_reset_flag(sk, SOCK_RXQ_OVFL);
		break;
743 744 745
	default:
		ret = -ENOPROTOOPT;
		break;
746
	}
L
Linus Torvalds 已提交
747 748 749
	release_sock(sk);
	return ret;
}
E
Eric Dumazet 已提交
750
EXPORT_SYMBOL(sock_setsockopt);
L
Linus Torvalds 已提交
751 752


753 754 755 756 757 758 759 760 761 762 763 764
void cred_to_ucred(struct pid *pid, const struct cred *cred,
		   struct ucred *ucred)
{
	ucred->pid = pid_vnr(pid);
	ucred->uid = ucred->gid = -1;
	if (cred) {
		struct user_namespace *current_ns = current_user_ns();

		ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid);
		ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid);
	}
}
765
EXPORT_SYMBOL_GPL(cred_to_ucred);
766

L
Linus Torvalds 已提交
767 768 769 770
int sock_getsockopt(struct socket *sock, int level, int optname,
		    char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
771

772
	union {
773 774
		int val;
		struct linger ling;
L
Linus Torvalds 已提交
775 776
		struct timeval tm;
	} v;
777

778
	int lv = sizeof(int);
L
Linus Torvalds 已提交
779
	int len;
780

781
	if (get_user(len, optlen))
782
		return -EFAULT;
783
	if (len < 0)
L
Linus Torvalds 已提交
784
		return -EINVAL;
785

786
	memset(&v, 0, sizeof(v));
787

E
Eric Dumazet 已提交
788
	switch (optname) {
789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820
	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;

821 822 823 824
	case SO_PROTOCOL:
		v.val = sk->sk_protocol;
		break;

825 826 827 828
	case SO_DOMAIN:
		v.val = sk->sk_family;
		break;

829 830
	case SO_ERROR:
		v.val = -sock_error(sk);
E
Eric Dumazet 已提交
831
		if (v.val == 0)
832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
			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:
858 859 860 861 862 863
		v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
				!sock_flag(sk, SOCK_RCVTSTAMPNS);
		break;

	case SO_TIMESTAMPNS:
		v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
864 865
		break;

866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883
	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;

884
	case SO_RCVTIMEO:
E
Eric Dumazet 已提交
885
		lv = sizeof(struct timeval);
886 887 888 889 890 891 892 893 894 895
		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
896
		lv = sizeof(struct timeval);
897 898 899 900 901 902 903 904
		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
905

906 907 908
	case SO_RCVLOWAT:
		v.val = sk->sk_rcvlowat;
		break;
L
Linus Torvalds 已提交
909

910
	case SO_SNDLOWAT:
E
Eric Dumazet 已提交
911
		v.val = 1;
912
		break;
L
Linus Torvalds 已提交
913

914 915 916
	case SO_PASSCRED:
		v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
		break;
L
Linus Torvalds 已提交
917

918
	case SO_PEERCRED:
919 920 921 922 923 924
	{
		struct ucred peercred;
		if (len > sizeof(peercred))
			len = sizeof(peercred);
		cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
		if (copy_to_user(optval, &peercred, len))
925 926
			return -EFAULT;
		goto lenout;
927
	}
L
Linus Torvalds 已提交
928

929 930 931 932 933 934 935 936 937 938 939 940
	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
941

942 943 944 945 946 947
	/* 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
948

949 950 951
	case SO_PASSSEC:
		v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
		break;
C
Catherine Zhang 已提交
952

953 954
	case SO_PEERSEC:
		return security_socket_getpeersec_stream(sock, optval, optlen, len);
L
Linus Torvalds 已提交
955

956 957 958 959
	case SO_MARK:
		v.val = sk->sk_mark;
		break;

960 961 962 963
	case SO_RXQ_OVFL:
		v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
		break;

964 965
	default:
		return -ENOPROTOOPT;
L
Linus Torvalds 已提交
966
	}
967

L
Linus Torvalds 已提交
968 969 970 971 972
	if (len > lv)
		len = lv;
	if (copy_to_user(optval, &v, len))
		return -EFAULT;
lenout:
973 974 975
	if (put_user(len, optlen))
		return -EFAULT;
	return 0;
L
Linus Torvalds 已提交
976 977
}

I
Ingo Molnar 已提交
978 979 980 981 982
/*
 * Initialize an sk_lock.
 *
 * (We also register the sk_lock with the lock validator.)
 */
D
Dave Jones 已提交
983
static inline void sock_lock_init(struct sock *sk)
I
Ingo Molnar 已提交
984
{
985 986 987 988 989
	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
990 991
}

E
Eric Dumazet 已提交
992 993 994 995
/*
 * 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.
 */
996 997 998 999 1000
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
1001
	BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
K
Krishna Kumar 已提交
1002 1003
		     sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
		     sizeof(osk->sk_tx_queue_mapping));
E
Eric Dumazet 已提交
1004 1005
	memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
	       osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
1006 1007 1008 1009 1010 1011
#ifdef CONFIG_SECURITY_NETWORK
	nsk->sk_security = sptr;
	security_sk_clone(osk, nsk);
#endif
}

1012 1013
static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
		int family)
1014 1015 1016 1017 1018
{
	struct sock *sk;
	struct kmem_cache *slab;

	slab = prot->slab;
1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035
	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));
		}
	}
1036 1037 1038
	else
		sk = kmalloc(prot->obj_size, priority);

1039
	if (sk != NULL) {
1040 1041
		kmemcheck_annotate_bitfield(sk, flags);

1042 1043 1044 1045 1046
		if (security_sk_alloc(sk, family, priority))
			goto out_free;

		if (!try_module_get(prot->owner))
			goto out_free_sec;
K
Krishna Kumar 已提交
1047
		sk_tx_queue_clear(sk);
1048 1049
	}

1050
	return sk;
1051 1052 1053 1054 1055 1056 1057 1058 1059

out_free_sec:
	security_sk_free(sk);
out_free:
	if (slab != NULL)
		kmem_cache_free(slab, sk);
	else
		kfree(sk);
	return NULL;
1060 1061 1062 1063 1064
}

static void sk_prot_free(struct proto *prot, struct sock *sk)
{
	struct kmem_cache *slab;
1065
	struct module *owner;
1066

1067
	owner = prot->owner;
1068
	slab = prot->slab;
1069 1070

	security_sk_free(sk);
1071 1072 1073 1074
	if (slab != NULL)
		kmem_cache_free(slab, sk);
	else
		kfree(sk);
1075
	module_put(owner);
1076 1077
}

1078 1079 1080
#ifdef CONFIG_CGROUPS
void sock_update_classid(struct sock *sk)
{
1081
	u32 classid;
1082

1083 1084 1085
	rcu_read_lock();  /* doing current task, which cannot vanish. */
	classid = task_cls_classid(current);
	rcu_read_unlock();
1086 1087 1088
	if (classid && classid != sk->sk_classid)
		sk->sk_classid = classid;
}
1089
EXPORT_SYMBOL(sock_update_classid);
1090 1091
#endif

L
Linus Torvalds 已提交
1092 1093
/**
 *	sk_alloc - All socket objects are allocated here
1094
 *	@net: the applicable net namespace
1095 1096 1097
 *	@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
1098
 */
1099
struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1100
		      struct proto *prot)
L
Linus Torvalds 已提交
1101
{
1102
	struct sock *sk;
L
Linus Torvalds 已提交
1103

1104
	sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
L
Linus Torvalds 已提交
1105
	if (sk) {
1106 1107 1108 1109 1110 1111 1112
		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);
1113
		sock_net_set(sk, get_net(net));
1114
		atomic_set(&sk->sk_wmem_alloc, 1);
1115 1116

		sock_update_classid(sk);
L
Linus Torvalds 已提交
1117
	}
1118

1119
	return sk;
L
Linus Torvalds 已提交
1120
}
E
Eric Dumazet 已提交
1121
EXPORT_SYMBOL(sk_alloc);
L
Linus Torvalds 已提交
1122

1123
static void __sk_free(struct sock *sk)
L
Linus Torvalds 已提交
1124 1125 1126 1127 1128 1129
{
	struct sk_filter *filter;

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

1130 1131
	filter = rcu_dereference_check(sk->sk_filter,
				       atomic_read(&sk->sk_wmem_alloc) == 0);
L
Linus Torvalds 已提交
1132
	if (filter) {
1133
		sk_filter_uncharge(sk, filter);
1134
		rcu_assign_pointer(sk->sk_filter, NULL);
L
Linus Torvalds 已提交
1135 1136
	}

1137 1138
	sock_disable_timestamp(sk, SOCK_TIMESTAMP);
	sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
L
Linus Torvalds 已提交
1139 1140 1141

	if (atomic_read(&sk->sk_omem_alloc))
		printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1142
		       __func__, atomic_read(&sk->sk_omem_alloc));
L
Linus Torvalds 已提交
1143

1144 1145 1146
	if (sk->sk_peer_cred)
		put_cred(sk->sk_peer_cred);
	put_pid(sk->sk_peer_pid);
1147
	put_net(sock_net(sk));
1148
	sk_prot_free(sk->sk_prot_creator, sk);
L
Linus Torvalds 已提交
1149
}
1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160

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
1161
EXPORT_SYMBOL(sk_free);
L
Linus Torvalds 已提交
1162

1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176
/*
 * 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);
1177
	release_net(sock_net(sk));
1178
	sock_net_set(sk, get_net(&init_net));
1179 1180
	sock_put(sk);
}
1181
EXPORT_SYMBOL(sk_release_kernel);
1182

A
Al Viro 已提交
1183
struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
1184
{
1185
	struct sock *newsk;
1186

1187
	newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1188 1189 1190
	if (newsk != NULL) {
		struct sk_filter *filter;

1191
		sock_copy(newsk, sk);
1192 1193

		/* SANITY */
1194
		get_net(sock_net(newsk));
1195 1196 1197
		sk_node_init(&newsk->sk_node);
		sock_lock_init(newsk);
		bh_lock_sock(newsk);
1198
		newsk->sk_backlog.head	= newsk->sk_backlog.tail = NULL;
Z
Zhu Yi 已提交
1199
		newsk->sk_backlog.len = 0;
1200 1201

		atomic_set(&newsk->sk_rmem_alloc, 0);
1202 1203 1204 1205
		/*
		 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
		 */
		atomic_set(&newsk->sk_wmem_alloc, 1);
1206 1207 1208
		atomic_set(&newsk->sk_omem_alloc, 0);
		skb_queue_head_init(&newsk->sk_receive_queue);
		skb_queue_head_init(&newsk->sk_write_queue);
1209 1210 1211
#ifdef CONFIG_NET_DMA
		skb_queue_head_init(&newsk->sk_async_wait_queue);
#endif
1212

E
Eric Dumazet 已提交
1213
		spin_lock_init(&newsk->sk_dst_lock);
1214
		rwlock_init(&newsk->sk_callback_lock);
1215 1216 1217
		lockdep_set_class_and_name(&newsk->sk_callback_lock,
				af_callback_keys + newsk->sk_family,
				af_family_clock_key_strings[newsk->sk_family]);
1218 1219 1220 1221 1222 1223 1224 1225 1226 1227

		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);

1228
		filter = rcu_dereference_protected(newsk->sk_filter, 1);
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242
		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
1243 1244 1245 1246 1247
		/*
		 * Before updating sk_refcnt, we must commit prior changes to memory
		 * (Documentation/RCU/rculist_nulls.txt for details)
		 */
		smp_wmb();
1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261
		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);
1262
		sk_set_socket(newsk, NULL);
1263
		newsk->sk_wq = NULL;
1264 1265

		if (newsk->sk_prot->sockets_allocated)
1266
			percpu_counter_inc(newsk->sk_prot->sockets_allocated);
1267 1268 1269 1270

		if (sock_flag(newsk, SOCK_TIMESTAMP) ||
		    sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
			net_enable_timestamp();
1271 1272 1273 1274 1275 1276
	}
out:
	return newsk;
}
EXPORT_SYMBOL_GPL(sk_clone);

1277 1278 1279 1280 1281
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)
1282
		sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
E
Eric Dumazet 已提交
1283
	sk->sk_route_caps &= ~sk->sk_route_nocaps;
1284
	if (sk_can_gso(sk)) {
1285
		if (dst->header_len) {
1286
			sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1287
		} else {
1288
			sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1289 1290
			sk->sk_gso_max_size = dst->dev->gso_max_size;
		}
1291 1292 1293 1294
	}
}
EXPORT_SYMBOL_GPL(sk_setup_caps);

L
Linus Torvalds 已提交
1295 1296
void __init sk_init(void)
{
1297
	if (totalram_pages <= 4096) {
L
Linus Torvalds 已提交
1298 1299 1300 1301
		sysctl_wmem_max = 32767;
		sysctl_rmem_max = 32767;
		sysctl_wmem_default = 32767;
		sysctl_rmem_default = 32767;
1302
	} else if (totalram_pages >= 131072) {
L
Linus Torvalds 已提交
1303 1304 1305 1306 1307 1308 1309 1310 1311 1312
		sysctl_wmem_max = 131071;
		sysctl_rmem_max = 131071;
	}
}

/*
 *	Simple resource managers for sockets.
 */


1313 1314
/*
 * Write buffer destructor automatically called from kfree_skb.
L
Linus Torvalds 已提交
1315 1316 1317 1318
 */
void sock_wfree(struct sk_buff *skb)
{
	struct sock *sk = skb->sk;
E
Eric Dumazet 已提交
1319
	unsigned int len = skb->truesize;
L
Linus Torvalds 已提交
1320

E
Eric Dumazet 已提交
1321 1322 1323 1324 1325 1326
	if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) {
		/*
		 * Keep a reference on sk_wmem_alloc, this will be released
		 * after sk_write_space() call
		 */
		atomic_sub(len - 1, &sk->sk_wmem_alloc);
L
Linus Torvalds 已提交
1327
		sk->sk_write_space(sk);
E
Eric Dumazet 已提交
1328 1329
		len = 1;
	}
1330
	/*
E
Eric Dumazet 已提交
1331 1332
	 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
	 * could not do because of in-flight packets
1333
	 */
E
Eric Dumazet 已提交
1334
	if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1335
		__sk_free(sk);
L
Linus Torvalds 已提交
1336
}
E
Eric Dumazet 已提交
1337
EXPORT_SYMBOL(sock_wfree);
L
Linus Torvalds 已提交
1338

1339 1340
/*
 * Read buffer destructor automatically called from kfree_skb.
L
Linus Torvalds 已提交
1341 1342 1343 1344
 */
void sock_rfree(struct sk_buff *skb)
{
	struct sock *sk = skb->sk;
E
Eric Dumazet 已提交
1345
	unsigned int len = skb->truesize;
L
Linus Torvalds 已提交
1346

E
Eric Dumazet 已提交
1347 1348
	atomic_sub(len, &sk->sk_rmem_alloc);
	sk_mem_uncharge(sk, len);
L
Linus Torvalds 已提交
1349
}
E
Eric Dumazet 已提交
1350
EXPORT_SYMBOL(sock_rfree);
L
Linus Torvalds 已提交
1351 1352 1353 1354 1355 1356


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

E
Eric Dumazet 已提交
1357
	read_lock_bh(&sk->sk_callback_lock);
L
Linus Torvalds 已提交
1358
	uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0;
E
Eric Dumazet 已提交
1359
	read_unlock_bh(&sk->sk_callback_lock);
L
Linus Torvalds 已提交
1360 1361
	return uid;
}
E
Eric Dumazet 已提交
1362
EXPORT_SYMBOL(sock_i_uid);
L
Linus Torvalds 已提交
1363 1364 1365 1366 1367

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

E
Eric Dumazet 已提交
1368
	read_lock_bh(&sk->sk_callback_lock);
L
Linus Torvalds 已提交
1369
	ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0;
E
Eric Dumazet 已提交
1370
	read_unlock_bh(&sk->sk_callback_lock);
L
Linus Torvalds 已提交
1371 1372
	return ino;
}
E
Eric Dumazet 已提交
1373
EXPORT_SYMBOL(sock_i_ino);
L
Linus Torvalds 已提交
1374 1375 1376 1377

/*
 * Allocate a skb from the socket's send buffer.
 */
V
Victor Fusco 已提交
1378
struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
A
Al Viro 已提交
1379
			     gfp_t priority)
L
Linus Torvalds 已提交
1380 1381
{
	if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
E
Eric Dumazet 已提交
1382
		struct sk_buff *skb = alloc_skb(size, priority);
L
Linus Torvalds 已提交
1383 1384 1385 1386 1387 1388 1389
		if (skb) {
			skb_set_owner_w(skb, sk);
			return skb;
		}
	}
	return NULL;
}
E
Eric Dumazet 已提交
1390
EXPORT_SYMBOL(sock_wmalloc);
L
Linus Torvalds 已提交
1391 1392 1393

/*
 * Allocate a skb from the socket's receive buffer.
1394
 */
V
Victor Fusco 已提交
1395
struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
A
Al Viro 已提交
1396
			     gfp_t priority)
L
Linus Torvalds 已提交
1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407
{
	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;
}

1408
/*
L
Linus Torvalds 已提交
1409
 * Allocate a memory block from the socket's option memory buffer.
1410
 */
A
Al Viro 已提交
1411
void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
L
Linus Torvalds 已提交
1412 1413 1414 1415 1416
{
	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
1417
		 * might sleep.
L
Linus Torvalds 已提交
1418 1419 1420 1421 1422 1423 1424 1425 1426
		 */
		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
1427
EXPORT_SYMBOL(sock_kmalloc);
L
Linus Torvalds 已提交
1428 1429 1430 1431 1432 1433 1434 1435 1436

/*
 * 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
1437
EXPORT_SYMBOL(sock_kfree_s);
L
Linus Torvalds 已提交
1438 1439 1440 1441

/* 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
1442
static long sock_wait_for_wmem(struct sock *sk, long timeo)
L
Linus Torvalds 已提交
1443 1444 1445 1446 1447 1448 1449 1450 1451 1452
{
	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);
E
Eric Dumazet 已提交
1453
		prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
1454 1455 1456 1457 1458 1459 1460 1461
		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);
	}
E
Eric Dumazet 已提交
1462
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
1463 1464 1465 1466 1467 1468 1469 1470
	return timeo;
}


/*
 *	Generic send/receive buffer handlers
 */

H
Herbert Xu 已提交
1471 1472 1473
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
1474 1475
{
	struct sk_buff *skb;
A
Al Viro 已提交
1476
	gfp_t gfp_mask;
L
Linus Torvalds 已提交
1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494
	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) {
1495
			skb = alloc_skb(header_len, gfp_mask);
L
Linus Torvalds 已提交
1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
			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
1553
EXPORT_SYMBOL(sock_alloc_send_pskb);
L
Linus Torvalds 已提交
1554

1555
struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
L
Linus Torvalds 已提交
1556 1557 1558 1559
				    int noblock, int *errcode)
{
	return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
}
E
Eric Dumazet 已提交
1560
EXPORT_SYMBOL(sock_alloc_send_skb);
L
Linus Torvalds 已提交
1561 1562

static void __lock_sock(struct sock *sk)
1563 1564
	__releases(&sk->sk_lock.slock)
	__acquires(&sk->sk_lock.slock)
L
Linus Torvalds 已提交
1565 1566 1567
{
	DEFINE_WAIT(wait);

1568
	for (;;) {
L
Linus Torvalds 已提交
1569 1570 1571 1572 1573
		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);
1574
		if (!sock_owned_by_user(sk))
L
Linus Torvalds 已提交
1575 1576 1577 1578 1579 1580
			break;
	}
	finish_wait(&sk->sk_lock.wq, &wait);
}

static void __release_sock(struct sock *sk)
1581 1582
	__releases(&sk->sk_lock.slock)
	__acquires(&sk->sk_lock.slock)
L
Linus Torvalds 已提交
1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
{
	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;

E
Eric Dumazet 已提交
1593
			WARN_ON_ONCE(skb_dst_is_noref(skb));
L
Linus Torvalds 已提交
1594
			skb->next = NULL;
P
Peter Zijlstra 已提交
1595
			sk_backlog_rcv(sk, skb);
L
Linus Torvalds 已提交
1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608

			/*
			 * 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);
1609
	} while ((skb = sk->sk_backlog.head) != NULL);
Z
Zhu Yi 已提交
1610 1611 1612 1613 1614 1615

	/*
	 * Doing the zeroing here guarantee we can not loop forever
	 * while a wild producer attempts to flood us.
	 */
	sk->sk_backlog.len = 0;
L
Linus Torvalds 已提交
1616 1617 1618 1619
}

/**
 * sk_wait_data - wait for data to arrive at sk_receive_queue
1620 1621
 * @sk:    sock to wait on
 * @timeo: for how long
L
Linus Torvalds 已提交
1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632
 *
 * 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);

E
Eric Dumazet 已提交
1633
	prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
L
Linus Torvalds 已提交
1634 1635 1636
	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);
E
Eric Dumazet 已提交
1637
	finish_wait(sk_sleep(sk), &wait);
L
Linus Torvalds 已提交
1638 1639 1640 1641
	return rc;
}
EXPORT_SYMBOL(sk_wait_data);

1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670
/**
 *	__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)
1671
			prot->enter_memory_pressure(sk);
1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690

	/* 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) {
1691 1692 1693 1694 1695 1696
		int alloc;

		if (!*prot->memory_pressure)
			return 1;
		alloc = percpu_counter_read_positive(prot->sockets_allocated);
		if (prot->sysctl_mem[2] > alloc *
1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729
		    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;

1730
	atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
1731 1732 1733 1734 1735 1736 1737 1738 1739 1740
		   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
1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751
/*
 * 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
1752
EXPORT_SYMBOL(sock_no_bind);
L
Linus Torvalds 已提交
1753

1754
int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
L
Linus Torvalds 已提交
1755 1756 1757 1758
		    int len, int flags)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1759
EXPORT_SYMBOL(sock_no_connect);
L
Linus Torvalds 已提交
1760 1761 1762 1763 1764

int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1765
EXPORT_SYMBOL(sock_no_socketpair);
L
Linus Torvalds 已提交
1766 1767 1768 1769 1770

int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1771
EXPORT_SYMBOL(sock_no_accept);
L
Linus Torvalds 已提交
1772

1773
int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
L
Linus Torvalds 已提交
1774 1775 1776 1777
		    int *len, int peer)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1778
EXPORT_SYMBOL(sock_no_getname);
L
Linus Torvalds 已提交
1779

E
Eric Dumazet 已提交
1780
unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
L
Linus Torvalds 已提交
1781 1782 1783
{
	return 0;
}
E
Eric Dumazet 已提交
1784
EXPORT_SYMBOL(sock_no_poll);
L
Linus Torvalds 已提交
1785 1786 1787 1788 1789

int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1790
EXPORT_SYMBOL(sock_no_ioctl);
L
Linus Torvalds 已提交
1791 1792 1793 1794 1795

int sock_no_listen(struct socket *sock, int backlog)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1796
EXPORT_SYMBOL(sock_no_listen);
L
Linus Torvalds 已提交
1797 1798 1799 1800 1801

int sock_no_shutdown(struct socket *sock, int how)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1802
EXPORT_SYMBOL(sock_no_shutdown);
L
Linus Torvalds 已提交
1803 1804

int sock_no_setsockopt(struct socket *sock, int level, int optname,
1805
		    char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
1806 1807 1808
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1809
EXPORT_SYMBOL(sock_no_setsockopt);
L
Linus Torvalds 已提交
1810 1811 1812 1813 1814 1815

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
1816
EXPORT_SYMBOL(sock_no_getsockopt);
L
Linus Torvalds 已提交
1817 1818 1819 1820 1821 1822

int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
		    size_t len)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1823
EXPORT_SYMBOL(sock_no_sendmsg);
L
Linus Torvalds 已提交
1824 1825 1826 1827 1828 1829

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
1830
EXPORT_SYMBOL(sock_no_recvmsg);
L
Linus Torvalds 已提交
1831 1832 1833 1834 1835 1836

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
1837
EXPORT_SYMBOL(sock_no_mmap);
L
Linus Torvalds 已提交
1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850

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
1851
EXPORT_SYMBOL(sock_no_sendpage);
L
Linus Torvalds 已提交
1852 1853 1854 1855 1856 1857 1858

/*
 *	Default Socket Callbacks
 */

static void sock_def_wakeup(struct sock *sk)
{
1859 1860 1861 1862 1863 1864 1865
	struct socket_wq *wq;

	rcu_read_lock();
	wq = rcu_dereference(sk->sk_wq);
	if (wq_has_sleeper(wq))
		wake_up_interruptible_all(&wq->wait);
	rcu_read_unlock();
L
Linus Torvalds 已提交
1866 1867 1868 1869
}

static void sock_def_error_report(struct sock *sk)
{
1870 1871 1872 1873 1874 1875
	struct socket_wq *wq;

	rcu_read_lock();
	wq = rcu_dereference(sk->sk_wq);
	if (wq_has_sleeper(wq))
		wake_up_interruptible_poll(&wq->wait, POLLERR);
1876
	sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
1877
	rcu_read_unlock();
L
Linus Torvalds 已提交
1878 1879 1880 1881
}

static void sock_def_readable(struct sock *sk, int len)
{
1882 1883 1884 1885 1886 1887
	struct socket_wq *wq;

	rcu_read_lock();
	wq = rcu_dereference(sk->sk_wq);
	if (wq_has_sleeper(wq))
		wake_up_interruptible_sync_poll(&wq->wait, POLLIN |
1888
						POLLRDNORM | POLLRDBAND);
1889
	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
1890
	rcu_read_unlock();
L
Linus Torvalds 已提交
1891 1892 1893 1894
}

static void sock_def_write_space(struct sock *sk)
{
1895 1896 1897
	struct socket_wq *wq;

	rcu_read_lock();
L
Linus Torvalds 已提交
1898 1899 1900 1901

	/* Do not wake up a writer until he can make "significant"
	 * progress.  --DaveM
	 */
1902
	if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1903 1904 1905
		wq = rcu_dereference(sk->sk_wq);
		if (wq_has_sleeper(wq))
			wake_up_interruptible_sync_poll(&wq->wait, POLLOUT |
1906
						POLLWRNORM | POLLWRBAND);
L
Linus Torvalds 已提交
1907 1908 1909

		/* Should agree with poll, otherwise some programs break */
		if (sock_writeable(sk))
1910
			sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
L
Linus Torvalds 已提交
1911 1912
	}

1913
	rcu_read_unlock();
L
Linus Torvalds 已提交
1914 1915 1916 1917
}

static void sock_def_destruct(struct sock *sk)
{
J
Jesper Juhl 已提交
1918
	kfree(sk->sk_protinfo);
L
Linus Torvalds 已提交
1919 1920 1921 1922 1923 1924
}

void sk_send_sigurg(struct sock *sk)
{
	if (sk->sk_socket && sk->sk_socket->file)
		if (send_sigurg(&sk->sk_socket->file->f_owner))
1925
			sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
L
Linus Torvalds 已提交
1926
}
E
Eric Dumazet 已提交
1927
EXPORT_SYMBOL(sk_send_sigurg);
L
Linus Torvalds 已提交
1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948

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);
1949 1950 1951
#ifdef CONFIG_NET_DMA
	skb_queue_head_init(&sk->sk_async_wait_queue);
#endif
L
Linus Torvalds 已提交
1952 1953 1954 1955

	sk->sk_send_head	=	NULL;

	init_timer(&sk->sk_timer);
1956

L
Linus Torvalds 已提交
1957 1958 1959 1960
	sk->sk_allocation	=	GFP_KERNEL;
	sk->sk_rcvbuf		=	sysctl_rmem_default;
	sk->sk_sndbuf		=	sysctl_wmem_default;
	sk->sk_state		=	TCP_CLOSE;
1961
	sk_set_socket(sk, sock);
L
Linus Torvalds 已提交
1962 1963 1964

	sock_set_flag(sk, SOCK_ZAPPED);

1965
	if (sock) {
L
Linus Torvalds 已提交
1966
		sk->sk_type	=	sock->type;
1967
		sk->sk_wq	=	sock->wq;
L
Linus Torvalds 已提交
1968 1969
		sock->sk	=	sk;
	} else
1970
		sk->sk_wq	=	NULL;
L
Linus Torvalds 已提交
1971

E
Eric Dumazet 已提交
1972
	spin_lock_init(&sk->sk_dst_lock);
L
Linus Torvalds 已提交
1973
	rwlock_init(&sk->sk_callback_lock);
1974 1975 1976
	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
1977 1978 1979 1980 1981 1982 1983 1984 1985 1986

	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;

1987 1988
	sk->sk_peer_pid 	=	NULL;
	sk->sk_peer_cred	=	NULL;
L
Linus Torvalds 已提交
1989 1990 1991 1992 1993
	sk->sk_write_pending	=	0;
	sk->sk_rcvlowat		=	1;
	sk->sk_rcvtimeo		=	MAX_SCHEDULE_TIMEOUT;
	sk->sk_sndtimeo		=	MAX_SCHEDULE_TIMEOUT;

1994
	sk->sk_stamp = ktime_set(-1L, 0);
L
Linus Torvalds 已提交
1995

E
Eric Dumazet 已提交
1996 1997 1998 1999 2000
	/*
	 * 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
2001
	atomic_set(&sk->sk_refcnt, 1);
W
Wang Chen 已提交
2002
	atomic_set(&sk->sk_drops, 0);
L
Linus Torvalds 已提交
2003
}
E
Eric Dumazet 已提交
2004
EXPORT_SYMBOL(sock_init_data);
L
Linus Torvalds 已提交
2005

H
Harvey Harrison 已提交
2006
void lock_sock_nested(struct sock *sk, int subclass)
L
Linus Torvalds 已提交
2007 2008
{
	might_sleep();
I
Ingo Molnar 已提交
2009
	spin_lock_bh(&sk->sk_lock.slock);
2010
	if (sk->sk_lock.owned)
L
Linus Torvalds 已提交
2011
		__lock_sock(sk);
2012
	sk->sk_lock.owned = 1;
I
Ingo Molnar 已提交
2013 2014 2015 2016
	spin_unlock(&sk->sk_lock.slock);
	/*
	 * The sk_lock has mutex_lock() semantics here:
	 */
2017
	mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
I
Ingo Molnar 已提交
2018
	local_bh_enable();
L
Linus Torvalds 已提交
2019
}
2020
EXPORT_SYMBOL(lock_sock_nested);
L
Linus Torvalds 已提交
2021

H
Harvey Harrison 已提交
2022
void release_sock(struct sock *sk)
L
Linus Torvalds 已提交
2023
{
I
Ingo Molnar 已提交
2024 2025 2026 2027 2028 2029
	/*
	 * 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
2030 2031
	if (sk->sk_backlog.tail)
		__release_sock(sk);
2032
	sk->sk_lock.owned = 0;
I
Ingo Molnar 已提交
2033 2034 2035
	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
2036 2037 2038
}
EXPORT_SYMBOL(release_sock);

2039 2040 2041 2042 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
/**
 * lock_sock_fast - fast version of lock_sock
 * @sk: socket
 *
 * This version should be used for very small section, where process wont block
 * return false if fast path is taken
 *   sk_lock.slock locked, owned = 0, BH disabled
 * return true if slow path is taken
 *   sk_lock.slock unlocked, owned = 1, BH enabled
 */
bool lock_sock_fast(struct sock *sk)
{
	might_sleep();
	spin_lock_bh(&sk->sk_lock.slock);

	if (!sk->sk_lock.owned)
		/*
		 * Note : We must disable BH
		 */
		return false;

	__lock_sock(sk);
	sk->sk_lock.owned = 1;
	spin_unlock(&sk->sk_lock.slock);
	/*
	 * The sk_lock has mutex_lock() semantics here:
	 */
	mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_);
	local_bh_enable();
	return true;
}
EXPORT_SYMBOL(lock_sock_fast);

L
Linus Torvalds 已提交
2072
int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
2073
{
2074
	struct timeval tv;
L
Linus Torvalds 已提交
2075
	if (!sock_flag(sk, SOCK_TIMESTAMP))
2076
		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2077 2078
	tv = ktime_to_timeval(sk->sk_stamp);
	if (tv.tv_sec == -1)
L
Linus Torvalds 已提交
2079
		return -ENOENT;
2080 2081 2082 2083 2084
	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;
2085
}
L
Linus Torvalds 已提交
2086 2087
EXPORT_SYMBOL(sock_get_timestamp);

2088 2089 2090 2091
int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
{
	struct timespec ts;
	if (!sock_flag(sk, SOCK_TIMESTAMP))
2092
		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103
	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);

2104
void sock_enable_timestamp(struct sock *sk, int flag)
2105
{
2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117
	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
2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136
	}
}

/*
 *	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);

2137
#ifdef CONFIG_COMPAT
2138 2139
int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
				  char __user *optval, int __user *optlen)
2140 2141 2142
{
	struct sock *sk = sock->sk;

2143
	if (sk->sk_prot->compat_getsockopt != NULL)
2144 2145
		return sk->sk_prot->compat_getsockopt(sk, level, optname,
						      optval, optlen);
2146 2147 2148 2149 2150
	return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
}
EXPORT_SYMBOL(compat_sock_common_getsockopt);
#endif

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Linus Torvalds 已提交
2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169
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,
2170
			   char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
2171 2172 2173 2174 2175 2176 2177
{
	struct sock *sk = sock->sk;

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

2178
#ifdef CONFIG_COMPAT
2179
int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2180
				  char __user *optval, unsigned int optlen)
2181 2182 2183
{
	struct sock *sk = sock->sk;

2184 2185 2186
	if (sk->sk_prot->compat_setsockopt != NULL)
		return sk->sk_prot->compat_setsockopt(sk, level, optname,
						      optval, optlen);
2187 2188 2189 2190 2191
	return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
}
EXPORT_SYMBOL(compat_sock_common_setsockopt);
#endif

L
Linus Torvalds 已提交
2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222
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);

2223
	sk_refcnt_debug_release(sk);
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2224 2225 2226 2227 2228 2229 2230
	sock_put(sk);
}
EXPORT_SYMBOL(sk_common_release);

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

2231 2232
#ifdef CONFIG_PROC_FS
#define PROTO_INUSE_NR	64	/* should be enough for the first time */
2233 2234 2235
struct prot_inuse {
	int val[PROTO_INUSE_NR];
};
2236 2237

static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2238 2239 2240 2241

#ifdef CONFIG_NET_NS
void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
{
E
Eric Dumazet 已提交
2242
	__this_cpu_add(net->core.inuse->val[prot->inuse_idx], val);
2243 2244 2245 2246 2247 2248 2249 2250 2251 2252 2253 2254 2255 2256 2257
}
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);

2258
static int __net_init sock_inuse_init_net(struct net *net)
2259 2260 2261 2262 2263
{
	net->core.inuse = alloc_percpu(struct prot_inuse);
	return net->core.inuse ? 0 : -ENOMEM;
}

2264
static void __net_exit sock_inuse_exit_net(struct net *net)
2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283
{
	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
2284 2285
static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);

2286
void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2287
{
E
Eric Dumazet 已提交
2288
	__this_cpu_add(prot_inuse.val[prot->inuse_idx], val);
2289 2290 2291
}
EXPORT_SYMBOL_GPL(sock_prot_inuse_add);

2292
int sock_prot_inuse_get(struct net *net, struct proto *prot)
2293 2294 2295 2296 2297 2298 2299 2300 2301 2302
{
	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);
2303
#endif
2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331

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

2332 2333
int proto_register(struct proto *prot, int alloc_slab)
{
L
Linus Torvalds 已提交
2334 2335
	if (alloc_slab) {
		prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2336 2337
					SLAB_HWCACHE_ALIGN | prot->slab_flags,
					NULL);
L
Linus Torvalds 已提交
2338 2339 2340 2341

		if (prot->slab == NULL) {
			printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
			       prot->name);
2342
			goto out;
L
Linus Torvalds 已提交
2343
		}
2344 2345

		if (prot->rsk_prot != NULL) {
2346
			prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2347
			if (prot->rsk_prot->slab_name == NULL)
2348 2349
				goto out_free_sock_slab;

2350
			prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2351
								 prot->rsk_prot->obj_size, 0,
2352
								 SLAB_HWCACHE_ALIGN, NULL);
2353 2354 2355 2356 2357 2358 2359

			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;
			}
		}
2360

2361
		if (prot->twsk_prot != NULL) {
2362
			prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2363

2364
			if (prot->twsk_prot->twsk_slab_name == NULL)
2365 2366
				goto out_free_request_sock_slab;

2367
			prot->twsk_prot->twsk_slab =
2368
				kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2369
						  prot->twsk_prot->twsk_obj_size,
2370 2371 2372
						  0,
						  SLAB_HWCACHE_ALIGN |
							prot->slab_flags,
2373
						  NULL);
2374
			if (prot->twsk_prot->twsk_slab == NULL)
2375 2376
				goto out_free_timewait_sock_slab_name;
		}
L
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2377 2378
	}

2379
	write_lock(&proto_list_lock);
L
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2380
	list_add(&prot->node, &proto_list);
2381
	assign_proto_idx(prot);
L
Linus Torvalds 已提交
2382
	write_unlock(&proto_list_lock);
2383 2384
	return 0;

2385
out_free_timewait_sock_slab_name:
2386
	kfree(prot->twsk_prot->twsk_slab_name);
2387 2388 2389 2390 2391
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;
	}
2392
out_free_request_sock_slab_name:
2393 2394
	if (prot->rsk_prot)
		kfree(prot->rsk_prot->slab_name);
2395 2396 2397
out_free_sock_slab:
	kmem_cache_destroy(prot->slab);
	prot->slab = NULL;
2398 2399
out:
	return -ENOBUFS;
L
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2400 2401 2402 2403 2404 2405
}
EXPORT_SYMBOL(proto_register);

void proto_unregister(struct proto *prot)
{
	write_lock(&proto_list_lock);
2406
	release_proto_idx(prot);
2407 2408
	list_del(&prot->node);
	write_unlock(&proto_list_lock);
L
Linus Torvalds 已提交
2409 2410 2411 2412 2413 2414

	if (prot->slab != NULL) {
		kmem_cache_destroy(prot->slab);
		prot->slab = NULL;
	}

2415 2416
	if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
		kmem_cache_destroy(prot->rsk_prot->slab);
2417
		kfree(prot->rsk_prot->slab_name);
2418 2419 2420
		prot->rsk_prot->slab = NULL;
	}

2421 2422
	if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
		kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2423
		kfree(prot->twsk_prot->twsk_slab_name);
2424
		prot->twsk_prot->twsk_slab = NULL;
2425
	}
L
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2426 2427 2428 2429 2430
}
EXPORT_SYMBOL(proto_unregister);

#ifdef CONFIG_PROC_FS
static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2431
	__acquires(proto_list_lock)
L
Linus Torvalds 已提交
2432 2433
{
	read_lock(&proto_list_lock);
2434
	return seq_list_start_head(&proto_list, *pos);
L
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2435 2436 2437 2438
}

static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
2439
	return seq_list_next(v, &proto_list, pos);
L
Linus Torvalds 已提交
2440 2441 2442
}

static void proto_seq_stop(struct seq_file *seq, void *v)
2443
	__releases(proto_list_lock)
L
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2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458
{
	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,
2459
		   sock_prot_inuse_get(seq_file_net(seq), proto),
L
Linus Torvalds 已提交
2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487
		   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)
{
2488
	if (v == &proto_list)
L
Linus Torvalds 已提交
2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499
		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
2500
		proto_seq_printf(seq, list_entry(v, struct proto, node));
L
Linus Torvalds 已提交
2501 2502 2503
	return 0;
}

2504
static const struct seq_operations proto_seq_ops = {
L
Linus Torvalds 已提交
2505 2506 2507 2508 2509 2510 2511 2512
	.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)
{
2513 2514
	return seq_open_net(inode, file, &proto_seq_ops,
			    sizeof(struct seq_net_private));
L
Linus Torvalds 已提交
2515 2516
}

2517
static const struct file_operations proto_seq_fops = {
L
Linus Torvalds 已提交
2518 2519 2520 2521
	.owner		= THIS_MODULE,
	.open		= proto_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
2522 2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539 2540 2541
	.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,
L
Linus Torvalds 已提交
2542 2543 2544 2545
};

static int __init proto_init(void)
{
2546
	return register_pernet_subsys(&proto_net_ops);
L
Linus Torvalds 已提交
2547 2548 2549 2550 2551
}

subsys_initcall(proto_init);

#endif /* PROC_FS */