sock.c 61.4 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)
264
{
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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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	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 (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);

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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:
507
		sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool);
508 509 510 511 512 513 514 515 516 517 518 519
		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;
520
set_sndbuf:
521 522 523 524 525
		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
526

527 528 529 530 531 532
		/*
		 *	Wake up sending tasks if we
		 *	upped the value.
		 */
		sk->sk_write_space(sk);
		break;
L
Linus Torvalds 已提交
533

534 535 536 537 538 539
	case SO_SNDBUFFORCE:
		if (!capable(CAP_NET_ADMIN)) {
			ret = -EPERM;
			break;
		}
		goto set_sndbuf;
540

541 542 543 544 545
	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 */
546

547 548
		if (val > sysctl_rmem_max)
			val = sysctl_rmem_max;
549
set_rcvbuf:
550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574
		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
575
			break;
576 577
		}
		goto set_rcvbuf;
L
Linus Torvalds 已提交
578

579
	case SO_KEEPALIVE:
L
Linus Torvalds 已提交
580
#ifdef CONFIG_INET
581 582
		if (sk->sk_protocol == IPPROTO_TCP)
			tcp_set_keepalive(sk, valbool);
L
Linus Torvalds 已提交
583
#endif
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604
		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
605
			break;
606
		}
E
Eric Dumazet 已提交
607
		if (copy_from_user(&ling, optval, sizeof(ling))) {
608
			ret = -EFAULT;
L
Linus Torvalds 已提交
609
			break;
610 611 612 613
		}
		if (!ling.l_onoff)
			sock_reset_flag(sk, SOCK_LINGER);
		else {
L
Linus Torvalds 已提交
614
#if (BITS_PER_LONG == 32)
615 616
			if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
				sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
L
Linus Torvalds 已提交
617
			else
618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635
#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:
636
	case SO_TIMESTAMPNS:
637
		if (valbool)  {
638 639 640 641
			if (optname == SO_TIMESTAMP)
				sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
			else
				sock_set_flag(sk, SOCK_RCVTSTAMPNS);
642
			sock_set_flag(sk, SOCK_RCVTSTAMP);
643
			sock_enable_timestamp(sk, SOCK_TIMESTAMP);
644
		} else {
645
			sock_reset_flag(sk, SOCK_RCVTSTAMP);
646 647
			sock_reset_flag(sk, SOCK_RCVTSTAMPNS);
		}
648 649
		break;

650 651
	case SO_TIMESTAMPING:
		if (val & ~SOF_TIMESTAMPING_MASK) {
652
			ret = -EINVAL;
653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674
			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;

675 676 677 678 679 680 681 682 683 684 685 686 687
	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
688

689 690 691 692
	case SO_ATTACH_FILTER:
		ret = -EINVAL;
		if (optlen == sizeof(struct sock_fprog)) {
			struct sock_fprog fprog;
L
Linus Torvalds 已提交
693

694 695
			ret = -EFAULT;
			if (copy_from_user(&fprog, optval, sizeof(fprog)))
L
Linus Torvalds 已提交
696
				break;
697 698 699 700 701 702

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

	case SO_DETACH_FILTER:
703
		ret = sk_detach_filter(sk);
704
		break;
L
Linus Torvalds 已提交
705

706 707 708 709 710 711
	case SO_PASSSEC:
		if (valbool)
			set_bit(SOCK_PASSSEC, &sock->flags);
		else
			clear_bit(SOCK_PASSSEC, &sock->flags);
		break;
712 713 714
	case SO_MARK:
		if (!capable(CAP_NET_ADMIN))
			ret = -EPERM;
E
Eric Dumazet 已提交
715
		else
716 717
			sk->sk_mark = val;
		break;
C
Catherine Zhang 已提交
718

L
Linus Torvalds 已提交
719 720
		/* We implement the SO_SNDLOWAT etc to
		   not be settable (1003.1g 5.3) */
721 722 723 724 725 726
	case SO_RXQ_OVFL:
		if (valbool)
			sock_set_flag(sk, SOCK_RXQ_OVFL);
		else
			sock_reset_flag(sk, SOCK_RXQ_OVFL);
		break;
727 728 729
	default:
		ret = -ENOPROTOOPT;
		break;
730
	}
L
Linus Torvalds 已提交
731 732 733
	release_sock(sk);
	return ret;
}
E
Eric Dumazet 已提交
734
EXPORT_SYMBOL(sock_setsockopt);
L
Linus Torvalds 已提交
735 736 737 738 739 740


int sock_getsockopt(struct socket *sock, int level, int optname,
		    char __user *optval, int __user *optlen)
{
	struct sock *sk = sock->sk;
741

742
	union {
743 744
		int val;
		struct linger ling;
L
Linus Torvalds 已提交
745 746
		struct timeval tm;
	} v;
747

748
	int lv = sizeof(int);
L
Linus Torvalds 已提交
749
	int len;
750

751
	if (get_user(len, optlen))
752
		return -EFAULT;
753
	if (len < 0)
L
Linus Torvalds 已提交
754
		return -EINVAL;
755

756
	memset(&v, 0, sizeof(v));
757

E
Eric Dumazet 已提交
758
	switch (optname) {
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790
	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;

791 792 793 794
	case SO_PROTOCOL:
		v.val = sk->sk_protocol;
		break;

795 796 797 798
	case SO_DOMAIN:
		v.val = sk->sk_family;
		break;

799 800
	case SO_ERROR:
		v.val = -sock_error(sk);
E
Eric Dumazet 已提交
801
		if (v.val == 0)
802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827
			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:
828 829 830 831 832 833
		v.val = sock_flag(sk, SOCK_RCVTSTAMP) &&
				!sock_flag(sk, SOCK_RCVTSTAMPNS);
		break;

	case SO_TIMESTAMPNS:
		v.val = sock_flag(sk, SOCK_RCVTSTAMPNS);
834 835
		break;

836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853
	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;

854
	case SO_RCVTIMEO:
E
Eric Dumazet 已提交
855
		lv = sizeof(struct timeval);
856 857 858 859 860 861 862 863 864 865
		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
866
		lv = sizeof(struct timeval);
867 868 869 870 871 872 873 874
		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
875

876 877 878
	case SO_RCVLOWAT:
		v.val = sk->sk_rcvlowat;
		break;
L
Linus Torvalds 已提交
879

880
	case SO_SNDLOWAT:
E
Eric Dumazet 已提交
881
		v.val = 1;
882
		break;
L
Linus Torvalds 已提交
883

884 885 886
	case SO_PASSCRED:
		v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
		break;
L
Linus Torvalds 已提交
887

888 889 890 891 892 893
	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
894

895 896 897 898 899 900 901 902 903 904 905 906
	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
907

908 909 910 911 912 913
	/* 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
914

915 916 917
	case SO_PASSSEC:
		v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0;
		break;
C
Catherine Zhang 已提交
918

919 920
	case SO_PEERSEC:
		return security_socket_getpeersec_stream(sock, optval, optlen, len);
L
Linus Torvalds 已提交
921

922 923 924 925
	case SO_MARK:
		v.val = sk->sk_mark;
		break;

926 927 928 929
	case SO_RXQ_OVFL:
		v.val = !!sock_flag(sk, SOCK_RXQ_OVFL);
		break;

930 931
	default:
		return -ENOPROTOOPT;
L
Linus Torvalds 已提交
932
	}
933

L
Linus Torvalds 已提交
934 935 936 937 938
	if (len > lv)
		len = lv;
	if (copy_to_user(optval, &v, len))
		return -EFAULT;
lenout:
939 940 941
	if (put_user(len, optlen))
		return -EFAULT;
	return 0;
L
Linus Torvalds 已提交
942 943
}

I
Ingo Molnar 已提交
944 945 946 947 948
/*
 * Initialize an sk_lock.
 *
 * (We also register the sk_lock with the lock validator.)
 */
D
Dave Jones 已提交
949
static inline void sock_lock_init(struct sock *sk)
I
Ingo Molnar 已提交
950
{
951 952 953 954 955
	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
956 957
}

E
Eric Dumazet 已提交
958 959 960 961
/*
 * 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.
 */
962 963 964 965 966
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
967
	BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) !=
K
Krishna Kumar 已提交
968 969
		     sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) +
		     sizeof(osk->sk_tx_queue_mapping));
E
Eric Dumazet 已提交
970 971
	memcpy(&nsk->sk_copy_start, &osk->sk_copy_start,
	       osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start));
972 973 974 975 976 977
#ifdef CONFIG_SECURITY_NETWORK
	nsk->sk_security = sptr;
	security_sk_clone(osk, nsk);
#endif
}

978 979
static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority,
		int family)
980 981 982 983 984
{
	struct sock *sk;
	struct kmem_cache *slab;

	slab = prot->slab;
985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001
	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));
		}
	}
1002 1003 1004
	else
		sk = kmalloc(prot->obj_size, priority);

1005
	if (sk != NULL) {
1006 1007
		kmemcheck_annotate_bitfield(sk, flags);

1008 1009 1010 1011 1012
		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
1013
		sk_tx_queue_clear(sk);
1014 1015
	}

1016
	return sk;
1017 1018 1019 1020 1021 1022 1023 1024 1025

out_free_sec:
	security_sk_free(sk);
out_free:
	if (slab != NULL)
		kmem_cache_free(slab, sk);
	else
		kfree(sk);
	return NULL;
1026 1027 1028 1029 1030
}

static void sk_prot_free(struct proto *prot, struct sock *sk)
{
	struct kmem_cache *slab;
1031
	struct module *owner;
1032

1033
	owner = prot->owner;
1034
	slab = prot->slab;
1035 1036

	security_sk_free(sk);
1037 1038 1039 1040
	if (slab != NULL)
		kmem_cache_free(slab, sk);
	else
		kfree(sk);
1041
	module_put(owner);
1042 1043
}

L
Linus Torvalds 已提交
1044 1045
/**
 *	sk_alloc - All socket objects are allocated here
1046
 *	@net: the applicable net namespace
1047 1048 1049
 *	@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
1050
 */
1051
struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
1052
		      struct proto *prot)
L
Linus Torvalds 已提交
1053
{
1054
	struct sock *sk;
L
Linus Torvalds 已提交
1055

1056
	sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family);
L
Linus Torvalds 已提交
1057
	if (sk) {
1058 1059 1060 1061 1062 1063 1064
		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);
1065
		sock_net_set(sk, get_net(net));
1066
		atomic_set(&sk->sk_wmem_alloc, 1);
L
Linus Torvalds 已提交
1067
	}
1068

1069
	return sk;
L
Linus Torvalds 已提交
1070
}
E
Eric Dumazet 已提交
1071
EXPORT_SYMBOL(sk_alloc);
L
Linus Torvalds 已提交
1072

1073
static void __sk_free(struct sock *sk)
L
Linus Torvalds 已提交
1074 1075 1076 1077 1078 1079
{
	struct sk_filter *filter;

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

1080 1081
	filter = rcu_dereference_check(sk->sk_filter,
				       atomic_read(&sk->sk_wmem_alloc) == 0);
L
Linus Torvalds 已提交
1082
	if (filter) {
1083
		sk_filter_uncharge(sk, filter);
1084
		rcu_assign_pointer(sk->sk_filter, NULL);
L
Linus Torvalds 已提交
1085 1086
	}

1087 1088
	sock_disable_timestamp(sk, SOCK_TIMESTAMP);
	sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE);
L
Linus Torvalds 已提交
1089 1090 1091

	if (atomic_read(&sk->sk_omem_alloc))
		printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
1092
		       __func__, atomic_read(&sk->sk_omem_alloc));
L
Linus Torvalds 已提交
1093

1094
	put_net(sock_net(sk));
1095
	sk_prot_free(sk->sk_prot_creator, sk);
L
Linus Torvalds 已提交
1096
}
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107

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
1108
EXPORT_SYMBOL(sk_free);
L
Linus Torvalds 已提交
1109

1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123
/*
 * 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);
1124
	release_net(sock_net(sk));
1125
	sock_net_set(sk, get_net(&init_net));
1126 1127
	sock_put(sk);
}
1128
EXPORT_SYMBOL(sk_release_kernel);
1129

A
Al Viro 已提交
1130
struct sock *sk_clone(const struct sock *sk, const gfp_t priority)
1131
{
1132
	struct sock *newsk;
1133

1134
	newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family);
1135 1136 1137
	if (newsk != NULL) {
		struct sk_filter *filter;

1138
		sock_copy(newsk, sk);
1139 1140

		/* SANITY */
1141
		get_net(sock_net(newsk));
1142 1143 1144
		sk_node_init(&newsk->sk_node);
		sock_lock_init(newsk);
		bh_lock_sock(newsk);
1145
		newsk->sk_backlog.head	= newsk->sk_backlog.tail = NULL;
Z
Zhu Yi 已提交
1146
		newsk->sk_backlog.len = 0;
1147 1148

		atomic_set(&newsk->sk_rmem_alloc, 0);
1149 1150 1151 1152
		/*
		 * sk_wmem_alloc set to one (see sk_free() and sock_wfree())
		 */
		atomic_set(&newsk->sk_wmem_alloc, 1);
1153 1154 1155
		atomic_set(&newsk->sk_omem_alloc, 0);
		skb_queue_head_init(&newsk->sk_receive_queue);
		skb_queue_head_init(&newsk->sk_write_queue);
1156 1157 1158
#ifdef CONFIG_NET_DMA
		skb_queue_head_init(&newsk->sk_async_wait_queue);
#endif
1159

E
Eric Dumazet 已提交
1160
		spin_lock_init(&newsk->sk_dst_lock);
1161
		rwlock_init(&newsk->sk_callback_lock);
1162 1163 1164
		lockdep_set_class_and_name(&newsk->sk_callback_lock,
				af_callback_keys + newsk->sk_family,
				af_family_clock_key_strings[newsk->sk_family]);
1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189

		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
1190 1191 1192 1193 1194
		/*
		 * Before updating sk_refcnt, we must commit prior changes to memory
		 * (Documentation/RCU/rculist_nulls.txt for details)
		 */
		smp_wmb();
1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208
		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);
1209
		sk_set_socket(newsk, NULL);
1210 1211 1212
		newsk->sk_sleep	 = NULL;

		if (newsk->sk_prot->sockets_allocated)
1213
			percpu_counter_inc(newsk->sk_prot->sockets_allocated);
1214 1215 1216 1217

		if (sock_flag(newsk, SOCK_TIMESTAMP) ||
		    sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE))
			net_enable_timestamp();
1218 1219 1220 1221 1222 1223
	}
out:
	return newsk;
}
EXPORT_SYMBOL_GPL(sk_clone);

1224 1225 1226 1227 1228
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)
1229
		sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE;
1230
	if (sk_can_gso(sk)) {
1231
		if (dst->header_len) {
1232
			sk->sk_route_caps &= ~NETIF_F_GSO_MASK;
1233
		} else {
1234
			sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM;
1235 1236
			sk->sk_gso_max_size = dst->dev->gso_max_size;
		}
1237 1238 1239 1240
	}
}
EXPORT_SYMBOL_GPL(sk_setup_caps);

L
Linus Torvalds 已提交
1241 1242
void __init sk_init(void)
{
1243
	if (totalram_pages <= 4096) {
L
Linus Torvalds 已提交
1244 1245 1246 1247
		sysctl_wmem_max = 32767;
		sysctl_rmem_max = 32767;
		sysctl_wmem_default = 32767;
		sysctl_rmem_default = 32767;
1248
	} else if (totalram_pages >= 131072) {
L
Linus Torvalds 已提交
1249 1250 1251 1252 1253 1254 1255 1256 1257 1258
		sysctl_wmem_max = 131071;
		sysctl_rmem_max = 131071;
	}
}

/*
 *	Simple resource managers for sockets.
 */


1259 1260
/*
 * Write buffer destructor automatically called from kfree_skb.
L
Linus Torvalds 已提交
1261 1262 1263 1264
 */
void sock_wfree(struct sk_buff *skb)
{
	struct sock *sk = skb->sk;
E
Eric Dumazet 已提交
1265
	unsigned int len = skb->truesize;
L
Linus Torvalds 已提交
1266

E
Eric Dumazet 已提交
1267 1268 1269 1270 1271 1272
	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
1273
		sk->sk_write_space(sk);
E
Eric Dumazet 已提交
1274 1275
		len = 1;
	}
1276
	/*
E
Eric Dumazet 已提交
1277 1278
	 * if sk_wmem_alloc reaches 0, we must finish what sk_free()
	 * could not do because of in-flight packets
1279
	 */
E
Eric Dumazet 已提交
1280
	if (atomic_sub_and_test(len, &sk->sk_wmem_alloc))
1281
		__sk_free(sk);
L
Linus Torvalds 已提交
1282
}
E
Eric Dumazet 已提交
1283
EXPORT_SYMBOL(sock_wfree);
L
Linus Torvalds 已提交
1284

1285 1286
/*
 * Read buffer destructor automatically called from kfree_skb.
L
Linus Torvalds 已提交
1287 1288 1289 1290 1291 1292
 */
void sock_rfree(struct sk_buff *skb)
{
	struct sock *sk = skb->sk;

	atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1293
	sk_mem_uncharge(skb->sk, skb->truesize);
L
Linus Torvalds 已提交
1294
}
E
Eric Dumazet 已提交
1295
EXPORT_SYMBOL(sock_rfree);
L
Linus Torvalds 已提交
1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306


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
1307
EXPORT_SYMBOL(sock_i_uid);
L
Linus Torvalds 已提交
1308 1309 1310 1311 1312 1313 1314 1315 1316 1317

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
1318
EXPORT_SYMBOL(sock_i_ino);
L
Linus Torvalds 已提交
1319 1320 1321 1322

/*
 * Allocate a skb from the socket's send buffer.
 */
V
Victor Fusco 已提交
1323
struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
A
Al Viro 已提交
1324
			     gfp_t priority)
L
Linus Torvalds 已提交
1325 1326
{
	if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
E
Eric Dumazet 已提交
1327
		struct sk_buff *skb = alloc_skb(size, priority);
L
Linus Torvalds 已提交
1328 1329 1330 1331 1332 1333 1334
		if (skb) {
			skb_set_owner_w(skb, sk);
			return skb;
		}
	}
	return NULL;
}
E
Eric Dumazet 已提交
1335
EXPORT_SYMBOL(sock_wmalloc);
L
Linus Torvalds 已提交
1336 1337 1338

/*
 * Allocate a skb from the socket's receive buffer.
1339
 */
V
Victor Fusco 已提交
1340
struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force,
A
Al Viro 已提交
1341
			     gfp_t priority)
L
Linus Torvalds 已提交
1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352
{
	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;
}

1353
/*
L
Linus Torvalds 已提交
1354
 * Allocate a memory block from the socket's option memory buffer.
1355
 */
A
Al Viro 已提交
1356
void *sock_kmalloc(struct sock *sk, int size, gfp_t priority)
L
Linus Torvalds 已提交
1357 1358 1359 1360 1361
{
	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
1362
		 * might sleep.
L
Linus Torvalds 已提交
1363 1364 1365 1366 1367 1368 1369 1370 1371
		 */
		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
1372
EXPORT_SYMBOL(sock_kmalloc);
L
Linus Torvalds 已提交
1373 1374 1375 1376 1377 1378 1379 1380 1381

/*
 * 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
1382
EXPORT_SYMBOL(sock_kfree_s);
L
Linus Torvalds 已提交
1383 1384 1385 1386

/* 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
1387
static long sock_wait_for_wmem(struct sock *sk, long timeo)
L
Linus Torvalds 已提交
1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
{
	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
1416 1417 1418
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
1419 1420
{
	struct sk_buff *skb;
A
Al Viro 已提交
1421
	gfp_t gfp_mask;
L
Linus Torvalds 已提交
1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439
	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) {
1440
			skb = alloc_skb(header_len, gfp_mask);
L
Linus Torvalds 已提交
1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497
			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
1498
EXPORT_SYMBOL(sock_alloc_send_pskb);
L
Linus Torvalds 已提交
1499

1500
struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
L
Linus Torvalds 已提交
1501 1502 1503 1504
				    int noblock, int *errcode)
{
	return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
}
E
Eric Dumazet 已提交
1505
EXPORT_SYMBOL(sock_alloc_send_skb);
L
Linus Torvalds 已提交
1506 1507 1508 1509 1510

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

1511
	for (;;) {
L
Linus Torvalds 已提交
1512 1513 1514 1515 1516
		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);
1517
		if (!sock_owned_by_user(sk))
L
Linus Torvalds 已提交
1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534
			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
1535
			sk_backlog_rcv(sk, skb);
L
Linus Torvalds 已提交
1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548

			/*
			 * 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);
1549
	} while ((skb = sk->sk_backlog.head) != NULL);
Z
Zhu Yi 已提交
1550 1551 1552 1553 1554 1555

	/*
	 * 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
1556 1557 1558 1559
}

/**
 * sk_wait_data - wait for data to arrive at sk_receive_queue
1560 1561
 * @sk:    sock to wait on
 * @timeo: for how long
L
Linus Torvalds 已提交
1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581
 *
 * 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);

1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610
/**
 *	__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)
1611
			prot->enter_memory_pressure(sk);
1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630

	/* 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) {
1631 1632 1633 1634 1635 1636
		int alloc;

		if (!*prot->memory_pressure)
			return 1;
		alloc = percpu_counter_read_positive(prot->sockets_allocated);
		if (prot->sysctl_mem[2] > alloc *
1637 1638 1639 1640 1641 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
		    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;

1670
	atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT,
1671 1672 1673 1674 1675 1676 1677 1678 1679 1680
		   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);


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Linus Torvalds 已提交
1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691
/*
 * 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
1692
EXPORT_SYMBOL(sock_no_bind);
L
Linus Torvalds 已提交
1693

1694
int sock_no_connect(struct socket *sock, struct sockaddr *saddr,
L
Linus Torvalds 已提交
1695 1696 1697 1698
		    int len, int flags)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1699
EXPORT_SYMBOL(sock_no_connect);
L
Linus Torvalds 已提交
1700 1701 1702 1703 1704

int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1705
EXPORT_SYMBOL(sock_no_socketpair);
L
Linus Torvalds 已提交
1706 1707 1708 1709 1710

int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1711
EXPORT_SYMBOL(sock_no_accept);
L
Linus Torvalds 已提交
1712

1713
int sock_no_getname(struct socket *sock, struct sockaddr *saddr,
L
Linus Torvalds 已提交
1714 1715 1716 1717
		    int *len, int peer)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1718
EXPORT_SYMBOL(sock_no_getname);
L
Linus Torvalds 已提交
1719

E
Eric Dumazet 已提交
1720
unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt)
L
Linus Torvalds 已提交
1721 1722 1723
{
	return 0;
}
E
Eric Dumazet 已提交
1724
EXPORT_SYMBOL(sock_no_poll);
L
Linus Torvalds 已提交
1725 1726 1727 1728 1729

int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1730
EXPORT_SYMBOL(sock_no_ioctl);
L
Linus Torvalds 已提交
1731 1732 1733 1734 1735

int sock_no_listen(struct socket *sock, int backlog)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1736
EXPORT_SYMBOL(sock_no_listen);
L
Linus Torvalds 已提交
1737 1738 1739 1740 1741

int sock_no_shutdown(struct socket *sock, int how)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1742
EXPORT_SYMBOL(sock_no_shutdown);
L
Linus Torvalds 已提交
1743 1744

int sock_no_setsockopt(struct socket *sock, int level, int optname,
1745
		    char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
1746 1747 1748
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1749
EXPORT_SYMBOL(sock_no_setsockopt);
L
Linus Torvalds 已提交
1750 1751 1752 1753 1754 1755

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
1756
EXPORT_SYMBOL(sock_no_getsockopt);
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Linus Torvalds 已提交
1757 1758 1759 1760 1761 1762

int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
		    size_t len)
{
	return -EOPNOTSUPP;
}
E
Eric Dumazet 已提交
1763
EXPORT_SYMBOL(sock_no_sendmsg);
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Linus Torvalds 已提交
1764 1765 1766 1767 1768 1769

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
1770
EXPORT_SYMBOL(sock_no_recvmsg);
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Linus Torvalds 已提交
1771 1772 1773 1774 1775 1776

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
1777
EXPORT_SYMBOL(sock_no_mmap);
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Linus Torvalds 已提交
1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790

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
1791
EXPORT_SYMBOL(sock_no_sendpage);
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Linus Torvalds 已提交
1792 1793 1794 1795 1796 1797 1798 1799

/*
 *	Default Socket Callbacks
 */

static void sock_def_wakeup(struct sock *sk)
{
	read_lock(&sk->sk_callback_lock);
1800
	if (sk_has_sleeper(sk))
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Linus Torvalds 已提交
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		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);
1808
	if (sk_has_sleeper(sk))
1809
		wake_up_interruptible_poll(sk->sk_sleep, POLLERR);
1810
	sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR);
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Linus Torvalds 已提交
1811 1812 1813 1814 1815 1816
	read_unlock(&sk->sk_callback_lock);
}

static void sock_def_readable(struct sock *sk, int len)
{
	read_lock(&sk->sk_callback_lock);
1817
	if (sk_has_sleeper(sk))
1818 1819
		wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN |
						POLLRDNORM | POLLRDBAND);
1820
	sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN);
L
Linus Torvalds 已提交
1821 1822 1823 1824 1825 1826 1827 1828 1829 1830
	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
	 */
1831
	if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
1832
		if (sk_has_sleeper(sk))
1833 1834
			wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT |
						POLLWRNORM | POLLWRBAND);
L
Linus Torvalds 已提交
1835 1836 1837

		/* Should agree with poll, otherwise some programs break */
		if (sock_writeable(sk))
1838
			sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
L
Linus Torvalds 已提交
1839 1840 1841 1842 1843 1844 1845
	}

	read_unlock(&sk->sk_callback_lock);
}

static void sock_def_destruct(struct sock *sk)
{
J
Jesper Juhl 已提交
1846
	kfree(sk->sk_protinfo);
L
Linus Torvalds 已提交
1847 1848 1849 1850 1851 1852
}

void sk_send_sigurg(struct sock *sk)
{
	if (sk->sk_socket && sk->sk_socket->file)
		if (send_sigurg(&sk->sk_socket->file->f_owner))
1853
			sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI);
L
Linus Torvalds 已提交
1854
}
E
Eric Dumazet 已提交
1855
EXPORT_SYMBOL(sk_send_sigurg);
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Linus Torvalds 已提交
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876

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);
1877 1878 1879
#ifdef CONFIG_NET_DMA
	skb_queue_head_init(&sk->sk_async_wait_queue);
#endif
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Linus Torvalds 已提交
1880 1881 1882 1883

	sk->sk_send_head	=	NULL;

	init_timer(&sk->sk_timer);
1884

L
Linus Torvalds 已提交
1885 1886 1887
	sk->sk_allocation	=	GFP_KERNEL;
	sk->sk_rcvbuf		=	sysctl_rmem_default;
	sk->sk_sndbuf		=	sysctl_wmem_default;
Z
Zhu Yi 已提交
1888
	sk->sk_backlog.limit	=	sk->sk_rcvbuf << 1;
L
Linus Torvalds 已提交
1889
	sk->sk_state		=	TCP_CLOSE;
1890
	sk_set_socket(sk, sock);
L
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1891 1892 1893

	sock_set_flag(sk, SOCK_ZAPPED);

1894
	if (sock) {
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1895 1896 1897 1898 1899 1900
		sk->sk_type	=	sock->type;
		sk->sk_sleep	=	&sock->wait;
		sock->sk	=	sk;
	} else
		sk->sk_sleep	=	NULL;

E
Eric Dumazet 已提交
1901
	spin_lock_init(&sk->sk_dst_lock);
L
Linus Torvalds 已提交
1902
	rwlock_init(&sk->sk_callback_lock);
1903 1904 1905
	lockdep_set_class_and_name(&sk->sk_callback_lock,
			af_callback_keys + sk->sk_family,
			af_family_clock_key_strings[sk->sk_family]);
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Linus Torvalds 已提交
1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923

	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;

1924
	sk->sk_stamp = ktime_set(-1L, 0);
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Linus Torvalds 已提交
1925

E
Eric Dumazet 已提交
1926 1927 1928 1929 1930
	/*
	 * 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
1931
	atomic_set(&sk->sk_refcnt, 1);
W
Wang Chen 已提交
1932
	atomic_set(&sk->sk_drops, 0);
L
Linus Torvalds 已提交
1933
}
E
Eric Dumazet 已提交
1934
EXPORT_SYMBOL(sock_init_data);
L
Linus Torvalds 已提交
1935

H
Harvey Harrison 已提交
1936
void lock_sock_nested(struct sock *sk, int subclass)
L
Linus Torvalds 已提交
1937 1938
{
	might_sleep();
I
Ingo Molnar 已提交
1939
	spin_lock_bh(&sk->sk_lock.slock);
1940
	if (sk->sk_lock.owned)
L
Linus Torvalds 已提交
1941
		__lock_sock(sk);
1942
	sk->sk_lock.owned = 1;
I
Ingo Molnar 已提交
1943 1944 1945 1946
	spin_unlock(&sk->sk_lock.slock);
	/*
	 * The sk_lock has mutex_lock() semantics here:
	 */
1947
	mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_);
I
Ingo Molnar 已提交
1948
	local_bh_enable();
L
Linus Torvalds 已提交
1949
}
1950
EXPORT_SYMBOL(lock_sock_nested);
L
Linus Torvalds 已提交
1951

H
Harvey Harrison 已提交
1952
void release_sock(struct sock *sk)
L
Linus Torvalds 已提交
1953
{
I
Ingo Molnar 已提交
1954 1955 1956 1957 1958 1959
	/*
	 * 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
1960 1961
	if (sk->sk_backlog.tail)
		__release_sock(sk);
1962
	sk->sk_lock.owned = 0;
I
Ingo Molnar 已提交
1963 1964 1965
	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
1966 1967 1968 1969
}
EXPORT_SYMBOL(release_sock);

int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
1970
{
1971
	struct timeval tv;
L
Linus Torvalds 已提交
1972
	if (!sock_flag(sk, SOCK_TIMESTAMP))
1973
		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
1974 1975
	tv = ktime_to_timeval(sk->sk_stamp);
	if (tv.tv_sec == -1)
L
Linus Torvalds 已提交
1976
		return -ENOENT;
1977 1978 1979 1980 1981
	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;
1982
}
L
Linus Torvalds 已提交
1983 1984
EXPORT_SYMBOL(sock_get_timestamp);

1985 1986 1987 1988
int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp)
{
	struct timespec ts;
	if (!sock_flag(sk, SOCK_TIMESTAMP))
1989
		sock_enable_timestamp(sk, SOCK_TIMESTAMP);
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
	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);

2001
void sock_enable_timestamp(struct sock *sk, int flag)
2002
{
2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
	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
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033
	}
}

/*
 *	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);

2034
#ifdef CONFIG_COMPAT
2035 2036
int compat_sock_common_getsockopt(struct socket *sock, int level, int optname,
				  char __user *optval, int __user *optlen)
2037 2038 2039
{
	struct sock *sk = sock->sk;

2040
	if (sk->sk_prot->compat_getsockopt != NULL)
2041 2042
		return sk->sk_prot->compat_getsockopt(sk, level, optname,
						      optval, optlen);
2043 2044 2045 2046 2047
	return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen);
}
EXPORT_SYMBOL(compat_sock_common_getsockopt);
#endif

L
Linus Torvalds 已提交
2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066
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,
2067
			   char __user *optval, unsigned int optlen)
L
Linus Torvalds 已提交
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{
	struct sock *sk = sock->sk;

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

2075
#ifdef CONFIG_COMPAT
2076
int compat_sock_common_setsockopt(struct socket *sock, int level, int optname,
2077
				  char __user *optval, unsigned int optlen)
2078 2079 2080
{
	struct sock *sk = sock->sk;

2081 2082 2083
	if (sk->sk_prot->compat_setsockopt != NULL)
		return sk->sk_prot->compat_setsockopt(sk, level, optname,
						      optval, optlen);
2084 2085 2086 2087 2088
	return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
}
EXPORT_SYMBOL(compat_sock_common_setsockopt);
#endif

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Linus Torvalds 已提交
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
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);

2120
	sk_refcnt_debug_release(sk);
L
Linus Torvalds 已提交
2121 2122 2123 2124 2125 2126 2127
	sock_put(sk);
}
EXPORT_SYMBOL(sk_common_release);

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

2128 2129
#ifdef CONFIG_PROC_FS
#define PROTO_INUSE_NR	64	/* should be enough for the first time */
2130 2131 2132
struct prot_inuse {
	int val[PROTO_INUSE_NR];
};
2133 2134

static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR);
2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155

#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);

2156
static int __net_init sock_inuse_init_net(struct net *net)
2157 2158 2159 2160 2161
{
	net->core.inuse = alloc_percpu(struct prot_inuse);
	return net->core.inuse ? 0 : -ENOMEM;
}

2162
static void __net_exit sock_inuse_exit_net(struct net *net)
2163 2164 2165 2166 2167 2168 2169 2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181
{
	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
2182 2183
static DEFINE_PER_CPU(struct prot_inuse, prot_inuse);

2184
void sock_prot_inuse_add(struct net *net, struct proto *prot, int val)
2185 2186 2187 2188 2189
{
	__get_cpu_var(prot_inuse).val[prot->inuse_idx] += val;
}
EXPORT_SYMBOL_GPL(sock_prot_inuse_add);

2190
int sock_prot_inuse_get(struct net *net, struct proto *prot)
2191 2192 2193 2194 2195 2196 2197 2198 2199 2200
{
	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);
2201
#endif
2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229

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

2230 2231
int proto_register(struct proto *prot, int alloc_slab)
{
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	if (alloc_slab) {
		prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
2234 2235
					SLAB_HWCACHE_ALIGN | prot->slab_flags,
					NULL);
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		if (prot->slab == NULL) {
			printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
			       prot->name);
2240
			goto out;
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		}
2242 2243

		if (prot->rsk_prot != NULL) {
2244
			prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name);
2245
			if (prot->rsk_prot->slab_name == NULL)
2246 2247
				goto out_free_sock_slab;

2248
			prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name,
2249
								 prot->rsk_prot->obj_size, 0,
2250
								 SLAB_HWCACHE_ALIGN, NULL);
2251 2252 2253 2254 2255 2256 2257

			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;
			}
		}
2258

2259
		if (prot->twsk_prot != NULL) {
2260
			prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name);
2261

2262
			if (prot->twsk_prot->twsk_slab_name == NULL)
2263 2264
				goto out_free_request_sock_slab;

2265
			prot->twsk_prot->twsk_slab =
2266
				kmem_cache_create(prot->twsk_prot->twsk_slab_name,
2267
						  prot->twsk_prot->twsk_obj_size,
2268 2269 2270
						  0,
						  SLAB_HWCACHE_ALIGN |
							prot->slab_flags,
2271
						  NULL);
2272
			if (prot->twsk_prot->twsk_slab == NULL)
2273 2274
				goto out_free_timewait_sock_slab_name;
		}
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	}

2277
	write_lock(&proto_list_lock);
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	list_add(&prot->node, &proto_list);
2279
	assign_proto_idx(prot);
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	write_unlock(&proto_list_lock);
2281 2282
	return 0;

2283
out_free_timewait_sock_slab_name:
2284
	kfree(prot->twsk_prot->twsk_slab_name);
2285 2286 2287 2288 2289
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;
	}
2290
out_free_request_sock_slab_name:
2291 2292
	if (prot->rsk_prot)
		kfree(prot->rsk_prot->slab_name);
2293 2294 2295
out_free_sock_slab:
	kmem_cache_destroy(prot->slab);
	prot->slab = NULL;
2296 2297
out:
	return -ENOBUFS;
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}
EXPORT_SYMBOL(proto_register);

void proto_unregister(struct proto *prot)
{
	write_lock(&proto_list_lock);
2304
	release_proto_idx(prot);
2305 2306
	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;
	}

2313 2314
	if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) {
		kmem_cache_destroy(prot->rsk_prot->slab);
2315
		kfree(prot->rsk_prot->slab_name);
2316 2317 2318
		prot->rsk_prot->slab = NULL;
	}

2319 2320
	if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) {
		kmem_cache_destroy(prot->twsk_prot->twsk_slab);
2321
		kfree(prot->twsk_prot->twsk_slab_name);
2322
		prot->twsk_prot->twsk_slab = NULL;
2323
	}
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}
EXPORT_SYMBOL(proto_unregister);

#ifdef CONFIG_PROC_FS
static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
2329
	__acquires(proto_list_lock)
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2330 2331
{
	read_lock(&proto_list_lock);
2332
	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)
{
2337
	return seq_list_next(v, &proto_list, pos);
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}

static void proto_seq_stop(struct seq_file *seq, void *v)
2341
	__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,
2357
		   sock_prot_inuse_get(seq_file_net(seq), proto),
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2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385
		   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)
{
2386
	if (v == &proto_list)
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2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397
		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
2398
		proto_seq_printf(seq, list_entry(v, struct proto, node));
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2399 2400 2401
	return 0;
}

2402
static const struct seq_operations proto_seq_ops = {
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	.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)
{
2411 2412
	return seq_open_net(inode, file, &proto_seq_ops,
			    sizeof(struct seq_net_private));
L
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2413 2414
}

2415
static const struct file_operations proto_seq_fops = {
L
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2416 2417 2418 2419
	.owner		= THIS_MODULE,
	.open		= proto_seq_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439
	.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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2440 2441 2442 2443
};

static int __init proto_init(void)
{
2444
	return register_pernet_subsys(&proto_net_ops);
L
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2445 2446 2447 2448 2449
}

subsys_initcall(proto_init);

#endif /* PROC_FS */