Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 1565 insertions, 0 deletions

diff --git a/net/core/sock.c b/net/core/sock.c
new file mode 100644
index 0000000..629ab4a
--- /dev/null
+++ b/net/core/sock.c
@@ -0,0 +1,1565 @@
+/*
+ * 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.
+ *
+ *
+ * Version:	$Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $
+ *
+ * Authors:	Ross Biro, <bir7@leland.Stanford.Edu>
+ *		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
+ *					code. The ACK stuff can wait and needs major 
+ *					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.
+ */
+
+#include <linux/config.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/major.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>
+
+#include <asm/uaccess.h>
+#include <asm/system.h>
+
+#include <linux/netdevice.h>
+#include <net/protocol.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/xfrm.h>
+#include <linux/ipsec.h>
+
+#include <linux/filter.h>
+
+#ifdef CONFIG_INET
+#include <net/tcp.h>
+#endif
+
+/* 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. */
+__u32 sysctl_wmem_max = SK_WMEM_MAX;
+__u32 sysctl_rmem_max = SK_RMEM_MAX;
+__u32 sysctl_wmem_default = SK_WMEM_MAX;
+__u32 sysctl_rmem_default = SK_RMEM_MAX;
+
+/* Maximal space eaten by iovec or ancilliary data plus some space */
+int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512);
+
+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;
+
+	*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];
+	if (strcmp(warncomm, current->comm) && warned < 5) { 
+		strcpy(warncomm,  current->comm); 
+		printk(KERN_WARNING "process `%s' is using obsolete "
+		       "%s SO_BSDCOMPAT\n", warncomm, name);
+		warned++;
+	}
+}
+
+static void sock_disable_timestamp(struct sock *sk)
+{	
+	if (sock_flag(sk, SOCK_TIMESTAMP)) { 
+		sock_reset_flag(sk, SOCK_TIMESTAMP);
+		net_disable_timestamp();
+	}
+}
+
+
+/*
+ *	This is meant for all protocols to use and covers goings on
+ *	at the socket level. Everything here is generic.
+ */
+
+int sock_setsockopt(struct socket *sock, int level, int optname,
+		    char __user *optval, int optlen)
+{
+	struct sock *sk=sock->sk;
+	struct sk_filter *filter;
+	int val;
+	int valbool;
+	struct linger ling;
+	int ret = 0;
+	
+	/*
+	 *	Options without arguments
+	 */
+
+#ifdef SO_DONTLINGER		/* Compatibility item... */
+	switch (optname) {
+		case SO_DONTLINGER:
+			sock_reset_flag(sk, SOCK_LINGER);
+			return 0;
+	}
+#endif	
+		
+  	if(optlen<sizeof(int))
+  		return(-EINVAL);
+  	
+	if (get_user(val, (int __user *)optval))
+		return -EFAULT;
+	
+  	valbool = val?1:0;
+
+	lock_sock(sk);
+
+  	switch(optname) 
+  	{
+		case SO_DEBUG:	
+			if(val && !capable(CAP_NET_ADMIN))
+			{
+				ret = -EACCES;
+			}
+			else if (valbool)
+				sock_set_flag(sk, SOCK_DBG);
+			else
+				sock_reset_flag(sk, SOCK_DBG);
+			break;
+		case SO_REUSEADDR:
+			sk->sk_reuse = valbool;
+			break;
+		case SO_TYPE:
+		case SO_ERROR:
+			ret = -ENOPROTOOPT;
+		  	break;
+		case SO_DONTROUTE:
+			if (valbool)
+				sock_set_flag(sk, SOCK_LOCALROUTE);
+			else
+				sock_reset_flag(sk, SOCK_LOCALROUTE);
+			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;
+
+			sk->sk_userlocks |= SOCK_SNDBUF_LOCK;
+			if ((val * 2) < SOCK_MIN_SNDBUF)
+				sk->sk_sndbuf = SOCK_MIN_SNDBUF;
+			else
+				sk->sk_sndbuf = val * 2;
+
+			/*
+			 *	Wake up sending tasks if we
+			 *	upped the value.
+			 */
+			sk->sk_write_space(sk);
+			break;
+
+		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 */
+			  
+			if (val > sysctl_rmem_max)
+				val = sysctl_rmem_max;
+
+			sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
+			/* FIXME: is this lower bound the right one? */
+			if ((val * 2) < SOCK_MIN_RCVBUF)
+				sk->sk_rcvbuf = SOCK_MIN_RCVBUF;
+			else
+				sk->sk_rcvbuf = val * 2;
+			break;
+
+		case SO_KEEPALIVE:
+#ifdef CONFIG_INET
+			if (sk->sk_protocol == IPPROTO_TCP)
+				tcp_set_keepalive(sk, valbool);
+#endif
+			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 */
+				break;
+			}
+			if (copy_from_user(&ling,optval,sizeof(ling))) {
+				ret = -EFAULT;
+				break;
+			}
+			if (!ling.l_onoff)
+				sock_reset_flag(sk, SOCK_LINGER);
+			else {
+#if (BITS_PER_LONG == 32)
+				if (ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ)
+					sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT;
+				else
+#endif
+					sk->sk_lingertime = 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:
+			if (valbool)  {
+				sock_set_flag(sk, SOCK_RCVTSTAMP);
+				sock_enable_timestamp(sk);
+			} else
+				sock_reset_flag(sk, SOCK_RCVTSTAMP);
+			break;
+
+		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;
+
+#ifdef CONFIG_NETDEVICES
+		case SO_BINDTODEVICE:
+		{
+			char devname[IFNAMSIZ]; 
+
+			/* Sorry... */ 
+			if (!capable(CAP_NET_RAW)) {
+				ret = -EPERM;
+				break;
+			}
+
+			/* 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 (!valbool) {
+				sk->sk_bound_dev_if = 0;
+			} else {
+				if (optlen > IFNAMSIZ) 
+					optlen = IFNAMSIZ; 
+				if (copy_from_user(devname, optval, optlen)) {
+					ret = -EFAULT;
+					break;
+				}
+
+				/* Remove any cached route for this socket. */
+				sk_dst_reset(sk);
+
+				if (devname[0] == '\0') {
+					sk->sk_bound_dev_if = 0;
+				} else {
+					struct net_device *dev = dev_get_by_name(devname);
+					if (!dev) {
+						ret = -ENODEV;
+						break;
+					}
+					sk->sk_bound_dev_if = dev->ifindex;
+					dev_put(dev);
+				}
+			}
+			break;
+		}
+#endif
+
+
+		case SO_ATTACH_FILTER:
+			ret = -EINVAL;
+			if (optlen == sizeof(struct sock_fprog)) {
+				struct sock_fprog fprog;
+
+				ret = -EFAULT;
+				if (copy_from_user(&fprog, optval, sizeof(fprog)))
+					break;
+
+				ret = sk_attach_filter(&fprog, sk);
+			}
+			break;
+
+		case SO_DETACH_FILTER:
+			spin_lock_bh(&sk->sk_lock.slock);
+			filter = sk->sk_filter;
+                        if (filter) {
+				sk->sk_filter = NULL;
+				spin_unlock_bh(&sk->sk_lock.slock);
+				sk_filter_release(sk, filter);
+				break;
+			}
+			spin_unlock_bh(&sk->sk_lock.slock);
+			ret = -ENONET;
+			break;
+
+		/* We implement the SO_SNDLOWAT etc to
+		   not be settable (1003.1g 5.3) */
+		default:
+		  	ret = -ENOPROTOOPT;
+			break;
+  	}
+	release_sock(sk);
+	return ret;
+}
+
+
+int sock_getsockopt(struct socket *sock, int level, int optname,
+		    char __user *optval, int __user *optlen)
+{
+	struct sock *sk = sock->sk;
+	
+	union
+	{
+  		int val;
+  		struct linger ling;
+		struct timeval tm;
+	} v;
+	
+	unsigned int lv = sizeof(int);
+	int len;
+  	
+  	if(get_user(len,optlen))
+  		return -EFAULT;
+	if(len < 0)
+		return -EINVAL;
+		
+  	switch(optname) 
+  	{
+		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;
+
+		case SO_ERROR:
+			v.val = -sock_error(sk);
+			if(v.val==0)
+				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:
+			v.val = sock_flag(sk, SOCK_RCVTSTAMP);
+			break;
+
+		case SO_RCVTIMEO:
+			lv=sizeof(struct timeval);
+			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:
+			lv=sizeof(struct timeval);
+			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;
+
+		case SO_RCVLOWAT:
+			v.val = sk->sk_rcvlowat;
+			break;
+
+		case SO_SNDLOWAT:
+			v.val=1;
+			break; 
+
+		case SO_PASSCRED:
+			v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0;
+			break;
+
+		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;
+
+		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;
+		}
+
+		/* 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;
+
+		case SO_PEERSEC:
+			return security_socket_getpeersec(sock, optval, optlen, len);
+
+		default:
+			return(-ENOPROTOOPT);
+	}
+	if (len > lv)
+		len = lv;
+	if (copy_to_user(optval, &v, len))
+		return -EFAULT;
+lenout:
+  	if (put_user(len, optlen))
+  		return -EFAULT;
+  	return 0;
+}
+
+/**
+ *	sk_alloc - All socket objects are allocated here
+ *	@family - protocol family
+ *	@priority - for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc)
+ *	@prot - struct proto associated with this new sock instance
+ *	@zero_it - if we should zero the newly allocated sock
+ */
+struct sock *sk_alloc(int family, int priority, struct proto *prot, int zero_it)
+{
+	struct sock *sk = NULL;
+	kmem_cache_t *slab = prot->slab;
+
+	if (slab != NULL)
+		sk = kmem_cache_alloc(slab, priority);
+	else
+		sk = kmalloc(prot->obj_size, priority);
+
+	if (sk) {
+		if (zero_it) {
+			memset(sk, 0, prot->obj_size);
+			sk->sk_family = family;
+			sk->sk_prot = prot;
+			sock_lock_init(sk);
+		}
+		
+		if (security_sk_alloc(sk, family, priority)) {
+			kmem_cache_free(slab, sk);
+			sk = NULL;
+		} else
+			__module_get(prot->owner);
+	}
+	return sk;
+}
+
+void sk_free(struct sock *sk)
+{
+	struct sk_filter *filter;
+	struct module *owner = sk->sk_prot->owner;
+
+	if (sk->sk_destruct)
+		sk->sk_destruct(sk);
+
+	filter = sk->sk_filter;
+	if (filter) {
+		sk_filter_release(sk, filter);
+		sk->sk_filter = NULL;
+	}
+
+	sock_disable_timestamp(sk);
+
+	if (atomic_read(&sk->sk_omem_alloc))
+		printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
+		       __FUNCTION__, atomic_read(&sk->sk_omem_alloc));
+
+	security_sk_free(sk);
+	if (sk->sk_prot->slab != NULL)
+		kmem_cache_free(sk->sk_prot->slab, sk);
+	else
+		kfree(sk);
+	module_put(owner);
+}
+
+void __init sk_init(void)
+{
+	if (num_physpages <= 4096) {
+		sysctl_wmem_max = 32767;
+		sysctl_rmem_max = 32767;
+		sysctl_wmem_default = 32767;
+		sysctl_rmem_default = 32767;
+	} else if (num_physpages >= 131072) {
+		sysctl_wmem_max = 131071;
+		sysctl_rmem_max = 131071;
+	}
+}
+
+/*
+ *	Simple resource managers for sockets.
+ */
+
+
+/* 
+ * Write buffer destructor automatically called from kfree_skb. 
+ */
+void sock_wfree(struct sk_buff *skb)
+{
+	struct sock *sk = skb->sk;
+
+	/* In case it might be waiting for more memory. */
+	atomic_sub(skb->truesize, &sk->sk_wmem_alloc);
+	if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE))
+		sk->sk_write_space(sk);
+	sock_put(sk);
+}
+
+/* 
+ * Read buffer destructor automatically called from kfree_skb. 
+ */
+void sock_rfree(struct sk_buff *skb)
+{
+	struct sock *sk = skb->sk;
+
+	atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
+}
+
+
+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;
+}
+
+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;
+}
+
+/*
+ * Allocate a skb from the socket's send buffer.
+ */
+struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int priority)
+{
+	if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) {
+		struct sk_buff * skb = alloc_skb(size, priority);
+		if (skb) {
+			skb_set_owner_w(skb, sk);
+			return skb;
+		}
+	}
+	return NULL;
+}
+
+/*
+ * Allocate a skb from the socket's receive buffer.
+ */ 
+struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority)
+{
+	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;
+}
+
+/* 
+ * Allocate a memory block from the socket's option memory buffer.
+ */ 
+void *sock_kmalloc(struct sock *sk, int size, int priority)
+{
+	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
+ 		 * might sleep.
+		 */
+		atomic_add(size, &sk->sk_omem_alloc);
+		mem = kmalloc(size, priority);
+		if (mem)
+			return mem;
+		atomic_sub(size, &sk->sk_omem_alloc);
+	}
+	return NULL;
+}
+
+/*
+ * 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);
+}
+
+/* It is almost wait_for_tcp_memory minus release_sock/lock_sock.
+   I think, these locks should be removed for datagram sockets.
+ */
+static long sock_wait_for_wmem(struct sock * sk, long timeo)
+{
+	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
+ */
+
+static struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
+					    unsigned long header_len,
+					    unsigned long data_len,
+					    int noblock, int *errcode)
+{
+	struct sk_buff *skb;
+	unsigned int gfp_mask;
+	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) {
+			skb = alloc_skb(header_len, sk->sk_allocation);
+			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;
+}
+
+struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 
+				    int noblock, int *errcode)
+{
+	return sock_alloc_send_pskb(sk, size, 0, noblock, errcode);
+}
+
+static void __lock_sock(struct sock *sk)
+{
+	DEFINE_WAIT(wait);
+
+	for(;;) {
+		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);
+		if(!sock_owned_by_user(sk))
+			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;
+			sk->sk_backlog_rcv(sk, skb);
+
+			/*
+			 * 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);
+	} while((skb = sk->sk_backlog.head) != NULL);
+}
+
+/**
+ * sk_wait_data - wait for data to arrive at sk_receive_queue
+ * sk - sock to wait on
+ * timeo - for how long
+ *
+ * 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);
+
+/*
+ * 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;
+}
+
+int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 
+		    int len, int flags)
+{
+	return -EOPNOTSUPP;
+}
+
+int sock_no_socketpair(struct socket *sock1, struct socket *sock2)
+{
+	return -EOPNOTSUPP;
+}
+
+int sock_no_accept(struct socket *sock, struct socket *newsock, int flags)
+{
+	return -EOPNOTSUPP;
+}
+
+int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 
+		    int *len, int peer)
+{
+	return -EOPNOTSUPP;
+}
+
+unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt)
+{
+	return 0;
+}
+
+int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+	return -EOPNOTSUPP;
+}
+
+int sock_no_listen(struct socket *sock, int backlog)
+{
+	return -EOPNOTSUPP;
+}
+
+int sock_no_shutdown(struct socket *sock, int how)
+{
+	return -EOPNOTSUPP;
+}
+
+int sock_no_setsockopt(struct socket *sock, int level, int optname,
+		    char __user *optval, int optlen)
+{
+	return -EOPNOTSUPP;
+}
+
+int sock_no_getsockopt(struct socket *sock, int level, int optname,
+		    char __user *optval, int __user *optlen)
+{
+	return -EOPNOTSUPP;
+}
+
+int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
+		    size_t len)
+{
+	return -EOPNOTSUPP;
+}
+
+int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
+		    size_t len, int flags)
+{
+	return -EOPNOTSUPP;
+}
+
+int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma)
+{
+	/* Mirror missing mmap method error code */
+	return -ENODEV;
+}
+
+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;
+}
+
+/*
+ *	Default Socket Callbacks
+ */
+
+static void sock_def_wakeup(struct sock *sk)
+{
+	read_lock(&sk->sk_callback_lock);
+	if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+		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);
+	if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+		wake_up_interruptible(sk->sk_sleep);
+	sk_wake_async(sk,0,POLL_ERR); 
+	read_unlock(&sk->sk_callback_lock);
+}
+
+static void sock_def_readable(struct sock *sk, int len)
+{
+	read_lock(&sk->sk_callback_lock);
+	if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+		wake_up_interruptible(sk->sk_sleep);
+	sk_wake_async(sk,1,POLL_IN);
+	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
+	 */
+	if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) {
+		if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+			wake_up_interruptible(sk->sk_sleep);
+
+		/* Should agree with poll, otherwise some programs break */
+		if (sock_writeable(sk))
+			sk_wake_async(sk, 2, POLL_OUT);
+	}
+
+	read_unlock(&sk->sk_callback_lock);
+}
+
+static void sock_def_destruct(struct sock *sk)
+{
+	if (sk->sk_protinfo)
+		kfree(sk->sk_protinfo);
+}
+
+void sk_send_sigurg(struct sock *sk)
+{
+	if (sk->sk_socket && sk->sk_socket->file)
+		if (send_sigurg(&sk->sk_socket->file->f_owner))
+			sk_wake_async(sk, 3, POLL_PRI);
+}
+
+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);
+
+	sk->sk_send_head	=	NULL;
+
+	init_timer(&sk->sk_timer);
+	
+	sk->sk_allocation	=	GFP_KERNEL;
+	sk->sk_rcvbuf		=	sysctl_rmem_default;
+	sk->sk_sndbuf		=	sysctl_wmem_default;
+	sk->sk_state		=	TCP_CLOSE;
+	sk->sk_socket		=	sock;
+
+	sock_set_flag(sk, SOCK_ZAPPED);
+
+	if(sock)
+	{
+		sk->sk_type	=	sock->type;
+		sk->sk_sleep	=	&sock->wait;
+		sock->sk	=	sk;
+	} else
+		sk->sk_sleep	=	NULL;
+
+	rwlock_init(&sk->sk_dst_lock);
+	rwlock_init(&sk->sk_callback_lock);
+
+	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;
+
+	sk->sk_stamp.tv_sec     = -1L;
+	sk->sk_stamp.tv_usec    = -1L;
+
+	atomic_set(&sk->sk_refcnt, 1);
+}
+
+void fastcall lock_sock(struct sock *sk)
+{
+	might_sleep();
+	spin_lock_bh(&(sk->sk_lock.slock));
+	if (sk->sk_lock.owner)
+		__lock_sock(sk);
+	sk->sk_lock.owner = (void *)1;
+	spin_unlock_bh(&(sk->sk_lock.slock));
+}
+
+EXPORT_SYMBOL(lock_sock);
+
+void fastcall release_sock(struct sock *sk)
+{
+	spin_lock_bh(&(sk->sk_lock.slock));
+	if (sk->sk_backlog.tail)
+		__release_sock(sk);
+	sk->sk_lock.owner = NULL;
+        if (waitqueue_active(&(sk->sk_lock.wq)))
+		wake_up(&(sk->sk_lock.wq));
+	spin_unlock_bh(&(sk->sk_lock.slock));
+}
+EXPORT_SYMBOL(release_sock);
+
+int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp)
+{ 
+	if (!sock_flag(sk, SOCK_TIMESTAMP))
+		sock_enable_timestamp(sk);
+	if (sk->sk_stamp.tv_sec == -1) 
+		return -ENOENT;
+	if (sk->sk_stamp.tv_sec == 0)
+		do_gettimeofday(&sk->sk_stamp);
+	return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ?
+		-EFAULT : 0; 
+} 
+EXPORT_SYMBOL(sock_get_timestamp);
+
+void sock_enable_timestamp(struct sock *sk)
+{	
+	if (!sock_flag(sk, SOCK_TIMESTAMP)) { 
+		sock_set_flag(sk, SOCK_TIMESTAMP);
+		net_enable_timestamp();
+	}
+}
+EXPORT_SYMBOL(sock_enable_timestamp); 
+
+/*
+ *	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);
+
+int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
+			struct msghdr *msg, size_t size, int flags)
+{
+	struct sock *sk = sock->sk;
+	int addr_len = 0;
+	int err;
+
+	err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
+				   flags & ~MSG_DONTWAIT, &addr_len);
+	if (err >= 0)
+		msg->msg_namelen = addr_len;
+	return err;
+}
+
+EXPORT_SYMBOL(sock_common_recvmsg);
+
+/*
+ *	Set socket options on an inet socket.
+ */
+int sock_common_setsockopt(struct socket *sock, int level, int optname,
+			   char __user *optval, int optlen)
+{
+	struct sock *sk = sock->sk;
+
+	return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen);
+}
+
+EXPORT_SYMBOL(sock_common_setsockopt);
+
+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);
+
+#ifdef INET_REFCNT_DEBUG
+	if (atomic_read(&sk->sk_refcnt) != 1)
+		printk(KERN_DEBUG "Destruction of the socket %p delayed, c=%d\n",
+		       sk, atomic_read(&sk->sk_refcnt));
+#endif
+	sock_put(sk);
+}
+
+EXPORT_SYMBOL(sk_common_release);
+
+static DEFINE_RWLOCK(proto_list_lock);
+static LIST_HEAD(proto_list);
+
+int proto_register(struct proto *prot, int alloc_slab)
+{
+	int rc = -ENOBUFS;
+
+	write_lock(&proto_list_lock);
+
+	if (alloc_slab) {
+		prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0,
+					       SLAB_HWCACHE_ALIGN, NULL, NULL);
+
+		if (prot->slab == NULL) {
+			printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n",
+			       prot->name);
+			goto out_unlock;
+		}
+	}
+
+	list_add(&prot->node, &proto_list);
+	rc = 0;
+out_unlock:
+	write_unlock(&proto_list_lock);
+	return rc;
+}
+
+EXPORT_SYMBOL(proto_register);
+
+void proto_unregister(struct proto *prot)
+{
+	write_lock(&proto_list_lock);
+
+	if (prot->slab != NULL) {
+		kmem_cache_destroy(prot->slab);
+		prot->slab = NULL;
+	}
+
+	list_del(&prot->node);
+	write_unlock(&proto_list_lock);
+}
+
+EXPORT_SYMBOL(proto_unregister);
+
+#ifdef CONFIG_PROC_FS
+static inline struct proto *__proto_head(void)
+{
+	return list_entry(proto_list.next, struct proto, node);
+}
+
+static inline struct proto *proto_head(void)
+{
+	return list_empty(&proto_list) ? NULL : __proto_head();
+}
+
+static inline struct proto *proto_next(struct proto *proto)
+{
+	return proto->node.next == &proto_list ? NULL :
+		list_entry(proto->node.next, struct proto, node);
+}
+
+static inline struct proto *proto_get_idx(loff_t pos)
+{
+	struct proto *proto;
+	loff_t i = 0;
+
+	list_for_each_entry(proto, &proto_list, node)
+		if (i++ == pos)
+			goto out;
+
+	proto = NULL;
+out:
+	return proto;
+}
+
+static void *proto_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	read_lock(&proto_list_lock);
+	return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN;
+}
+
+static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	++*pos;
+	return v == SEQ_START_TOKEN ? proto_head() : proto_next(v);
+}
+
+static void proto_seq_stop(struct seq_file *seq, void *v)
+{
+	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,
+		   proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1,
+		   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)
+{
+	if (v == SEQ_START_TOKEN)
+		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
+		proto_seq_printf(seq, v);
+	return 0;
+}
+
+static struct seq_operations proto_seq_ops = {
+	.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)
+{
+	return seq_open(file, &proto_seq_ops);
+}
+
+static struct file_operations proto_seq_fops = {
+	.owner		= THIS_MODULE,
+	.open		= proto_seq_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release,
+};
+
+static int __init proto_init(void)
+{
+	/* register /proc/net/protocols */
+	return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0;
+}
+
+subsys_initcall(proto_init);
+
+#endif /* PROC_FS */
+
+EXPORT_SYMBOL(sk_alloc);
+EXPORT_SYMBOL(sk_free);
+EXPORT_SYMBOL(sk_send_sigurg);
+EXPORT_SYMBOL(sock_alloc_send_skb);
+EXPORT_SYMBOL(sock_init_data);
+EXPORT_SYMBOL(sock_kfree_s);
+EXPORT_SYMBOL(sock_kmalloc);
+EXPORT_SYMBOL(sock_no_accept);
+EXPORT_SYMBOL(sock_no_bind);
+EXPORT_SYMBOL(sock_no_connect);
+EXPORT_SYMBOL(sock_no_getname);
+EXPORT_SYMBOL(sock_no_getsockopt);
+EXPORT_SYMBOL(sock_no_ioctl);
+EXPORT_SYMBOL(sock_no_listen);
+EXPORT_SYMBOL(sock_no_mmap);
+EXPORT_SYMBOL(sock_no_poll);
+EXPORT_SYMBOL(sock_no_recvmsg);
+EXPORT_SYMBOL(sock_no_sendmsg);
+EXPORT_SYMBOL(sock_no_sendpage);
+EXPORT_SYMBOL(sock_no_setsockopt);
+EXPORT_SYMBOL(sock_no_shutdown);
+EXPORT_SYMBOL(sock_no_socketpair);
+EXPORT_SYMBOL(sock_rfree);
+EXPORT_SYMBOL(sock_setsockopt);
+EXPORT_SYMBOL(sock_wfree);
+EXPORT_SYMBOL(sock_wmalloc);
+EXPORT_SYMBOL(sock_i_uid);
+EXPORT_SYMBOL(sock_i_ino);
+#ifdef CONFIG_SYSCTL
+EXPORT_SYMBOL(sysctl_optmem_max);
+EXPORT_SYMBOL(sysctl_rmem_max);
+EXPORT_SYMBOL(sysctl_wmem_max);
+#endif