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, 1297 insertions, 0 deletions

diff --git a/include/net/sock.h b/include/net/sock.h
new file mode 100644
index 000000000000..be81cabd0da3
--- /dev/null
+++ b/include/net/sock.h
@@ -0,0 +1,1297 @@
+/*
+ * 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.
+ *
+ *		Definitions for the AF_INET socket handler.
+ *
+ * Version:	@(#)sock.h	1.0.4	05/13/93
+ *
+ * Authors:	Ross Biro, <bir7@leland.Stanford.Edu>
+ *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *		Corey Minyard <wf-rch!minyard@relay.EU.net>
+ *		Florian La Roche <flla@stud.uni-sb.de>
+ *
+ * Fixes:
+ *		Alan Cox	:	Volatiles in skbuff pointers. See
+ *					skbuff comments. May be overdone,
+ *					better to prove they can be removed
+ *					than the reverse.
+ *		Alan Cox	:	Added a zapped field for tcp to note
+ *					a socket is reset and must stay shut up
+ *		Alan Cox	:	New fields for options
+ *	Pauline Middelink	:	identd support
+ *		Alan Cox	:	Eliminate low level recv/recvfrom
+ *		David S. Miller	:	New socket lookup architecture.
+ *              Steve Whitehouse:       Default routines for sock_ops
+ *              Arnaldo C. Melo :	removed net_pinfo, tp_pinfo and made
+ *              			protinfo be just a void pointer, as the
+ *              			protocol specific parts were moved to
+ *              			respective headers and ipv4/v6, etc now
+ *              			use private slabcaches for its socks
+ *              Pedro Hortas	:	New flags field for socket options
+ *
+ *
+ *		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.
+ */
+#ifndef _SOCK_H
+#define _SOCK_H
+
+#include <linux/config.h>
+#include <linux/list.h>
+#include <linux/timer.h>
+#include <linux/cache.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>	/* struct sk_buff */
+#include <linux/security.h>
+
+#include <linux/filter.h>
+
+#include <asm/atomic.h>
+#include <net/dst.h>
+#include <net/checksum.h>
+
+/*
+ * This structure really needs to be cleaned up.
+ * Most of it is for TCP, and not used by any of
+ * the other protocols.
+ */
+
+/* Define this to get the SOCK_DBG debugging facility. */
+#define SOCK_DEBUGGING
+#ifdef SOCK_DEBUGGING
+#define SOCK_DEBUG(sk, msg...) do { if ((sk) && sock_flag((sk), SOCK_DBG)) \
+					printk(KERN_DEBUG msg); } while (0)
+#else
+#define SOCK_DEBUG(sk, msg...) do { } while (0)
+#endif
+
+/* This is the per-socket lock.  The spinlock provides a synchronization
+ * between user contexts and software interrupt processing, whereas the
+ * mini-semaphore synchronizes multiple users amongst themselves.
+ */
+struct sock_iocb;
+typedef struct {
+	spinlock_t		slock;
+	struct sock_iocb	*owner;
+	wait_queue_head_t	wq;
+} socket_lock_t;
+
+#define sock_lock_init(__sk) \
+do {	spin_lock_init(&((__sk)->sk_lock.slock)); \
+	(__sk)->sk_lock.owner = NULL; \
+	init_waitqueue_head(&((__sk)->sk_lock.wq)); \
+} while(0)
+
+struct sock;
+
+/**
+  *	struct sock_common - minimal network layer representation of sockets
+  *	@skc_family - network address family
+  *	@skc_state - Connection state
+  *	@skc_reuse - %SO_REUSEADDR setting
+  *	@skc_bound_dev_if - bound device index if != 0
+  *	@skc_node - main hash linkage for various protocol lookup tables
+  *	@skc_bind_node - bind hash linkage for various protocol lookup tables
+  *	@skc_refcnt - reference count
+  *
+  *	This is the minimal network layer representation of sockets, the header
+  *	for struct sock and struct tcp_tw_bucket.
+  */
+struct sock_common {
+	unsigned short		skc_family;
+	volatile unsigned char	skc_state;
+	unsigned char		skc_reuse;
+	int			skc_bound_dev_if;
+	struct hlist_node	skc_node;
+	struct hlist_node	skc_bind_node;
+	atomic_t		skc_refcnt;
+};
+
+/**
+  *	struct sock - network layer representation of sockets
+  *	@__sk_common - shared layout with tcp_tw_bucket
+  *	@sk_shutdown - mask of %SEND_SHUTDOWN and/or %RCV_SHUTDOWN
+  *	@sk_userlocks - %SO_SNDBUF and %SO_RCVBUF settings
+  *	@sk_lock -	synchronizer
+  *	@sk_rcvbuf - size of receive buffer in bytes
+  *	@sk_sleep - sock wait queue
+  *	@sk_dst_cache - destination cache
+  *	@sk_dst_lock - destination cache lock
+  *	@sk_policy - flow policy
+  *	@sk_rmem_alloc - receive queue bytes committed
+  *	@sk_receive_queue - incoming packets
+  *	@sk_wmem_alloc - transmit queue bytes committed
+  *	@sk_write_queue - Packet sending queue
+  *	@sk_omem_alloc - "o" is "option" or "other"
+  *	@sk_wmem_queued - persistent queue size
+  *	@sk_forward_alloc - space allocated forward
+  *	@sk_allocation - allocation mode
+  *	@sk_sndbuf - size of send buffer in bytes
+  *	@sk_flags - %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE, %SO_OOBINLINE settings
+  *	@sk_no_check - %SO_NO_CHECK setting, wether or not checkup packets
+  *	@sk_route_caps - route capabilities (e.g. %NETIF_F_TSO)
+  *	@sk_lingertime - %SO_LINGER l_linger setting
+  *	@sk_hashent - hash entry in several tables (e.g. tcp_ehash)
+  *	@sk_backlog - always used with the per-socket spinlock held
+  *	@sk_callback_lock - used with the callbacks in the end of this struct
+  *	@sk_error_queue - rarely used
+  *	@sk_prot - protocol handlers inside a network family
+  *	@sk_err - last error
+  *	@sk_err_soft - errors that don't cause failure but are the cause of a persistent failure not just 'timed out'
+  *	@sk_ack_backlog - current listen backlog
+  *	@sk_max_ack_backlog - listen backlog set in listen()
+  *	@sk_priority - %SO_PRIORITY setting
+  *	@sk_type - socket type (%SOCK_STREAM, etc)
+  *	@sk_protocol - which protocol this socket belongs in this network family
+  *	@sk_peercred - %SO_PEERCRED setting
+  *	@sk_rcvlowat - %SO_RCVLOWAT setting
+  *	@sk_rcvtimeo - %SO_RCVTIMEO setting
+  *	@sk_sndtimeo - %SO_SNDTIMEO setting
+  *	@sk_filter - socket filtering instructions
+  *	@sk_protinfo - private area, net family specific, when not using slab
+  *	@sk_timer - sock cleanup timer
+  *	@sk_stamp - time stamp of last packet received
+  *	@sk_socket - Identd and reporting IO signals
+  *	@sk_user_data - RPC layer private data
+  *	@sk_sndmsg_page - cached page for sendmsg
+  *	@sk_sndmsg_off - cached offset for sendmsg
+  *	@sk_send_head - front of stuff to transmit
+  *	@sk_write_pending - a write to stream socket waits to start
+  *	@sk_state_change - callback to indicate change in the state of the sock
+  *	@sk_data_ready - callback to indicate there is data to be processed
+  *	@sk_write_space - callback to indicate there is bf sending space available
+  *	@sk_error_report - callback to indicate errors (e.g. %MSG_ERRQUEUE)
+  *	@sk_backlog_rcv - callback to process the backlog
+  *	@sk_destruct - called at sock freeing time, i.e. when all refcnt == 0
+ */
+struct sock {
+	/*
+	 * Now struct tcp_tw_bucket also uses sock_common, so please just
+	 * don't add nothing before this first member (__sk_common) --acme
+	 */
+	struct sock_common	__sk_common;
+#define sk_family		__sk_common.skc_family
+#define sk_state		__sk_common.skc_state
+#define sk_reuse		__sk_common.skc_reuse
+#define sk_bound_dev_if		__sk_common.skc_bound_dev_if
+#define sk_node			__sk_common.skc_node
+#define sk_bind_node		__sk_common.skc_bind_node
+#define sk_refcnt		__sk_common.skc_refcnt
+	unsigned char		sk_shutdown : 2,
+				sk_no_check : 2,
+				sk_userlocks : 4;
+	unsigned char		sk_protocol;
+	unsigned short		sk_type;
+	int			sk_rcvbuf;
+	socket_lock_t		sk_lock;
+	wait_queue_head_t	*sk_sleep;
+	struct dst_entry	*sk_dst_cache;
+	struct xfrm_policy	*sk_policy[2];
+	rwlock_t		sk_dst_lock;
+	atomic_t		sk_rmem_alloc;
+	atomic_t		sk_wmem_alloc;
+	atomic_t		sk_omem_alloc;
+	struct sk_buff_head	sk_receive_queue;
+	struct sk_buff_head	sk_write_queue;
+	int			sk_wmem_queued;
+	int			sk_forward_alloc;
+	unsigned int		sk_allocation;
+	int			sk_sndbuf;
+	int			sk_route_caps;
+	int			sk_hashent;
+	unsigned long 		sk_flags;
+	unsigned long	        sk_lingertime;
+	/*
+	 * The backlog queue is special, it is always used with
+	 * the per-socket spinlock held and requires low latency
+	 * access. Therefore we special case it's implementation.
+	 */
+	struct {
+		struct sk_buff *head;
+		struct sk_buff *tail;
+	} sk_backlog;
+	struct sk_buff_head	sk_error_queue;
+	struct proto		*sk_prot;
+	rwlock_t		sk_callback_lock;
+	int			sk_err,
+				sk_err_soft;
+	unsigned short		sk_ack_backlog;
+	unsigned short		sk_max_ack_backlog;
+	__u32			sk_priority;
+	struct ucred		sk_peercred;
+	int			sk_rcvlowat;
+	long			sk_rcvtimeo;
+	long			sk_sndtimeo;
+	struct sk_filter      	*sk_filter;
+	void			*sk_protinfo;
+	struct timer_list	sk_timer;
+	struct timeval		sk_stamp;
+	struct socket		*sk_socket;
+	void			*sk_user_data;
+	struct page		*sk_sndmsg_page;
+	struct sk_buff		*sk_send_head;
+	__u32			sk_sndmsg_off;
+	int			sk_write_pending;
+	void			*sk_security;
+	void			(*sk_state_change)(struct sock *sk);
+	void			(*sk_data_ready)(struct sock *sk, int bytes);
+	void			(*sk_write_space)(struct sock *sk);
+	void			(*sk_error_report)(struct sock *sk);
+  	int			(*sk_backlog_rcv)(struct sock *sk,
+						  struct sk_buff *skb);  
+	void                    (*sk_destruct)(struct sock *sk);
+};
+
+/*
+ * Hashed lists helper routines
+ */
+static inline struct sock *__sk_head(struct hlist_head *head)
+{
+	return hlist_entry(head->first, struct sock, sk_node);
+}
+
+static inline struct sock *sk_head(struct hlist_head *head)
+{
+	return hlist_empty(head) ? NULL : __sk_head(head);
+}
+
+static inline struct sock *sk_next(struct sock *sk)
+{
+	return sk->sk_node.next ?
+		hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL;
+}
+
+static inline int sk_unhashed(struct sock *sk)
+{
+	return hlist_unhashed(&sk->sk_node);
+}
+
+static inline int sk_hashed(struct sock *sk)
+{
+	return sk->sk_node.pprev != NULL;
+}
+
+static __inline__ void sk_node_init(struct hlist_node *node)
+{
+	node->pprev = NULL;
+}
+
+static __inline__ void __sk_del_node(struct sock *sk)
+{
+	__hlist_del(&sk->sk_node);
+}
+
+static __inline__ int __sk_del_node_init(struct sock *sk)
+{
+	if (sk_hashed(sk)) {
+		__sk_del_node(sk);
+		sk_node_init(&sk->sk_node);
+		return 1;
+	}
+	return 0;
+}
+
+/* Grab socket reference count. This operation is valid only
+   when sk is ALREADY grabbed f.e. it is found in hash table
+   or a list and the lookup is made under lock preventing hash table
+   modifications.
+ */
+
+static inline void sock_hold(struct sock *sk)
+{
+	atomic_inc(&sk->sk_refcnt);
+}
+
+/* Ungrab socket in the context, which assumes that socket refcnt
+   cannot hit zero, f.e. it is true in context of any socketcall.
+ */
+static inline void __sock_put(struct sock *sk)
+{
+	atomic_dec(&sk->sk_refcnt);
+}
+
+static __inline__ int sk_del_node_init(struct sock *sk)
+{
+	int rc = __sk_del_node_init(sk);
+
+	if (rc) {
+		/* paranoid for a while -acme */
+		WARN_ON(atomic_read(&sk->sk_refcnt) == 1);
+		__sock_put(sk);
+	}
+	return rc;
+}
+
+static __inline__ void __sk_add_node(struct sock *sk, struct hlist_head *list)
+{
+	hlist_add_head(&sk->sk_node, list);
+}
+
+static __inline__ void sk_add_node(struct sock *sk, struct hlist_head *list)
+{
+	sock_hold(sk);
+	__sk_add_node(sk, list);
+}
+
+static __inline__ void __sk_del_bind_node(struct sock *sk)
+{
+	__hlist_del(&sk->sk_bind_node);
+}
+
+static __inline__ void sk_add_bind_node(struct sock *sk,
+					struct hlist_head *list)
+{
+	hlist_add_head(&sk->sk_bind_node, list);
+}
+
+#define sk_for_each(__sk, node, list) \
+	hlist_for_each_entry(__sk, node, list, sk_node)
+#define sk_for_each_from(__sk, node) \
+	if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
+		hlist_for_each_entry_from(__sk, node, sk_node)
+#define sk_for_each_continue(__sk, node) \
+	if (__sk && ({ node = &(__sk)->sk_node; 1; })) \
+		hlist_for_each_entry_continue(__sk, node, sk_node)
+#define sk_for_each_safe(__sk, node, tmp, list) \
+	hlist_for_each_entry_safe(__sk, node, tmp, list, sk_node)
+#define sk_for_each_bound(__sk, node, list) \
+	hlist_for_each_entry(__sk, node, list, sk_bind_node)
+
+/* Sock flags */
+enum sock_flags {
+	SOCK_DEAD,
+	SOCK_DONE,
+	SOCK_URGINLINE,
+	SOCK_KEEPOPEN,
+	SOCK_LINGER,
+	SOCK_DESTROY,
+	SOCK_BROADCAST,
+	SOCK_TIMESTAMP,
+	SOCK_ZAPPED,
+	SOCK_USE_WRITE_QUEUE, /* whether to call sk->sk_write_space in sock_wfree */
+	SOCK_DBG, /* %SO_DEBUG setting */
+	SOCK_RCVTSTAMP, /* %SO_TIMESTAMP setting */
+	SOCK_NO_LARGESEND, /* whether to sent large segments or not */
+	SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */
+	SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */
+};
+
+static inline void sock_set_flag(struct sock *sk, enum sock_flags flag)
+{
+	__set_bit(flag, &sk->sk_flags);
+}
+
+static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag)
+{
+	__clear_bit(flag, &sk->sk_flags);
+}
+
+static inline int sock_flag(struct sock *sk, enum sock_flags flag)
+{
+	return test_bit(flag, &sk->sk_flags);
+}
+
+static inline void sk_acceptq_removed(struct sock *sk)
+{
+	sk->sk_ack_backlog--;
+}
+
+static inline void sk_acceptq_added(struct sock *sk)
+{
+	sk->sk_ack_backlog++;
+}
+
+static inline int sk_acceptq_is_full(struct sock *sk)
+{
+	return sk->sk_ack_backlog > sk->sk_max_ack_backlog;
+}
+
+/*
+ * Compute minimal free write space needed to queue new packets.
+ */
+static inline int sk_stream_min_wspace(struct sock *sk)
+{
+	return sk->sk_wmem_queued / 2;
+}
+
+static inline int sk_stream_wspace(struct sock *sk)
+{
+	return sk->sk_sndbuf - sk->sk_wmem_queued;
+}
+
+extern void sk_stream_write_space(struct sock *sk);
+
+static inline int sk_stream_memory_free(struct sock *sk)
+{
+	return sk->sk_wmem_queued < sk->sk_sndbuf;
+}
+
+extern void sk_stream_rfree(struct sk_buff *skb);
+
+static inline void sk_stream_set_owner_r(struct sk_buff *skb, struct sock *sk)
+{
+	skb->sk = sk;
+	skb->destructor = sk_stream_rfree;
+	atomic_add(skb->truesize, &sk->sk_rmem_alloc);
+	sk->sk_forward_alloc -= skb->truesize;
+}
+
+static inline void sk_stream_free_skb(struct sock *sk, struct sk_buff *skb)
+{
+	sock_set_flag(sk, SOCK_QUEUE_SHRUNK);
+	sk->sk_wmem_queued   -= skb->truesize;
+	sk->sk_forward_alloc += skb->truesize;
+	__kfree_skb(skb);
+}
+
+/* The per-socket spinlock must be held here. */
+#define sk_add_backlog(__sk, __skb)				\
+do {	if (!(__sk)->sk_backlog.tail) {				\
+		(__sk)->sk_backlog.head =			\
+		     (__sk)->sk_backlog.tail = (__skb);		\
+	} else {						\
+		((__sk)->sk_backlog.tail)->next = (__skb);	\
+		(__sk)->sk_backlog.tail = (__skb);		\
+	}							\
+	(__skb)->next = NULL;					\
+} while(0)
+
+#define sk_wait_event(__sk, __timeo, __condition)		\
+({	int rc;							\
+	release_sock(__sk);					\
+	rc = __condition;					\
+	if (!rc) {						\
+		*(__timeo) = schedule_timeout(*(__timeo));	\
+		rc = __condition;				\
+	}							\
+	lock_sock(__sk);					\
+	rc;							\
+})
+
+extern int sk_stream_wait_connect(struct sock *sk, long *timeo_p);
+extern int sk_stream_wait_memory(struct sock *sk, long *timeo_p);
+extern void sk_stream_wait_close(struct sock *sk, long timeo_p);
+extern int sk_stream_error(struct sock *sk, int flags, int err);
+extern void sk_stream_kill_queues(struct sock *sk);
+
+extern int sk_wait_data(struct sock *sk, long *timeo);
+
+/* Networking protocol blocks we attach to sockets.
+ * socket layer -> transport layer interface
+ * transport -> network interface is defined by struct inet_proto
+ */
+struct proto {
+	void			(*close)(struct sock *sk, 
+					long timeout);
+	int			(*connect)(struct sock *sk,
+				        struct sockaddr *uaddr, 
+					int addr_len);
+	int			(*disconnect)(struct sock *sk, int flags);
+
+	struct sock *		(*accept) (struct sock *sk, int flags, int *err);
+
+	int			(*ioctl)(struct sock *sk, int cmd,
+					 unsigned long arg);
+	int			(*init)(struct sock *sk);
+	int			(*destroy)(struct sock *sk);
+	void			(*shutdown)(struct sock *sk, int how);
+	int			(*setsockopt)(struct sock *sk, int level, 
+					int optname, char __user *optval,
+					int optlen);
+	int			(*getsockopt)(struct sock *sk, int level, 
+					int optname, char __user *optval, 
+					int __user *option);  	 
+	int			(*sendmsg)(struct kiocb *iocb, struct sock *sk,
+					   struct msghdr *msg, size_t len);
+	int			(*recvmsg)(struct kiocb *iocb, struct sock *sk,
+					   struct msghdr *msg,
+					size_t len, int noblock, int flags, 
+					int *addr_len);
+	int			(*sendpage)(struct sock *sk, struct page *page,
+					int offset, size_t size, int flags);
+	int			(*bind)(struct sock *sk, 
+					struct sockaddr *uaddr, int addr_len);
+
+	int			(*backlog_rcv) (struct sock *sk, 
+						struct sk_buff *skb);
+
+	/* Keeping track of sk's, looking them up, and port selection methods. */
+	void			(*hash)(struct sock *sk);
+	void			(*unhash)(struct sock *sk);
+	int			(*get_port)(struct sock *sk, unsigned short snum);
+
+	/* Memory pressure */
+	void			(*enter_memory_pressure)(void);
+	atomic_t		*memory_allocated;	/* Current allocated memory. */
+	atomic_t		*sockets_allocated;	/* Current number of sockets. */
+	/*
+	 * Pressure flag: try to collapse.
+	 * Technical note: it is used by multiple contexts non atomically.
+	 * All the sk_stream_mem_schedule() is of this nature: accounting
+	 * is strict, actions are advisory and have some latency.
+	 */
+	int			*memory_pressure;
+	int			*sysctl_mem;
+	int			*sysctl_wmem;
+	int			*sysctl_rmem;
+	int			max_header;
+
+	kmem_cache_t		*slab;
+	unsigned int		obj_size;
+
+	struct module		*owner;
+
+	char			name[32];
+
+	struct list_head	node;
+
+	struct {
+		int inuse;
+		u8  __pad[SMP_CACHE_BYTES - sizeof(int)];
+	} stats[NR_CPUS];
+};
+
+extern int proto_register(struct proto *prot, int alloc_slab);
+extern void proto_unregister(struct proto *prot);
+
+/* Called with local bh disabled */
+static __inline__ void sock_prot_inc_use(struct proto *prot)
+{
+	prot->stats[smp_processor_id()].inuse++;
+}
+
+static __inline__ void sock_prot_dec_use(struct proto *prot)
+{
+	prot->stats[smp_processor_id()].inuse--;
+}
+
+/* About 10 seconds */
+#define SOCK_DESTROY_TIME (10*HZ)
+
+/* Sockets 0-1023 can't be bound to unless you are superuser */
+#define PROT_SOCK	1024
+
+#define SHUTDOWN_MASK	3
+#define RCV_SHUTDOWN	1
+#define SEND_SHUTDOWN	2
+
+#define SOCK_SNDBUF_LOCK	1
+#define SOCK_RCVBUF_LOCK	2
+#define SOCK_BINDADDR_LOCK	4
+#define SOCK_BINDPORT_LOCK	8
+
+/* sock_iocb: used to kick off async processing of socket ios */
+struct sock_iocb {
+	struct list_head	list;
+
+	int			flags;
+	int			size;
+	struct socket		*sock;
+	struct sock		*sk;
+	struct scm_cookie	*scm;
+	struct msghdr		*msg, async_msg;
+	struct iovec		async_iov;
+	struct kiocb		*kiocb;
+};
+
+static inline struct sock_iocb *kiocb_to_siocb(struct kiocb *iocb)
+{
+	return (struct sock_iocb *)iocb->private;
+}
+
+static inline struct kiocb *siocb_to_kiocb(struct sock_iocb *si)
+{
+	return si->kiocb;
+}
+
+struct socket_alloc {
+	struct socket socket;
+	struct inode vfs_inode;
+};
+
+static inline struct socket *SOCKET_I(struct inode *inode)
+{
+	return &container_of(inode, struct socket_alloc, vfs_inode)->socket;
+}
+
+static inline struct inode *SOCK_INODE(struct socket *socket)
+{
+	return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
+}
+
+extern void __sk_stream_mem_reclaim(struct sock *sk);
+extern int sk_stream_mem_schedule(struct sock *sk, int size, int kind);
+
+#define SK_STREAM_MEM_QUANTUM ((int)PAGE_SIZE)
+
+static inline int sk_stream_pages(int amt)
+{
+	return (amt + SK_STREAM_MEM_QUANTUM - 1) / SK_STREAM_MEM_QUANTUM;
+}
+
+static inline void sk_stream_mem_reclaim(struct sock *sk)
+{
+	if (sk->sk_forward_alloc >= SK_STREAM_MEM_QUANTUM)
+		__sk_stream_mem_reclaim(sk);
+}
+
+static inline void sk_stream_writequeue_purge(struct sock *sk)
+{
+	struct sk_buff *skb;
+
+	while ((skb = __skb_dequeue(&sk->sk_write_queue)) != NULL)
+		sk_stream_free_skb(sk, skb);
+	sk_stream_mem_reclaim(sk);
+}
+
+static inline int sk_stream_rmem_schedule(struct sock *sk, struct sk_buff *skb)
+{
+	return (int)skb->truesize <= sk->sk_forward_alloc ||
+		sk_stream_mem_schedule(sk, skb->truesize, 1);
+}
+
+/* Used by processes to "lock" a socket state, so that
+ * interrupts and bottom half handlers won't change it
+ * from under us. It essentially blocks any incoming
+ * packets, so that we won't get any new data or any
+ * packets that change the state of the socket.
+ *
+ * While locked, BH processing will add new packets to
+ * the backlog queue.  This queue is processed by the
+ * owner of the socket lock right before it is released.
+ *
+ * Since ~2.3.5 it is also exclusive sleep lock serializing
+ * accesses from user process context.
+ */
+#define sock_owned_by_user(sk)	((sk)->sk_lock.owner)
+
+extern void FASTCALL(lock_sock(struct sock *sk));
+extern void FASTCALL(release_sock(struct sock *sk));
+
+/* BH context may only use the following locking interface. */
+#define bh_lock_sock(__sk)	spin_lock(&((__sk)->sk_lock.slock))
+#define bh_unlock_sock(__sk)	spin_unlock(&((__sk)->sk_lock.slock))
+
+extern struct sock		*sk_alloc(int family, int priority,
+					  struct proto *prot, int zero_it);
+extern void			sk_free(struct sock *sk);
+
+extern struct sk_buff		*sock_wmalloc(struct sock *sk,
+					      unsigned long size, int force,
+					      int priority);
+extern struct sk_buff		*sock_rmalloc(struct sock *sk,
+					      unsigned long size, int force,
+					      int priority);
+extern void			sock_wfree(struct sk_buff *skb);
+extern void			sock_rfree(struct sk_buff *skb);
+
+extern int			sock_setsockopt(struct socket *sock, int level,
+						int op, char __user *optval,
+						int optlen);
+
+extern int			sock_getsockopt(struct socket *sock, int level,
+						int op, char __user *optval, 
+						int __user *optlen);
+extern struct sk_buff 		*sock_alloc_send_skb(struct sock *sk,
+						     unsigned long size,
+						     int noblock,
+						     int *errcode);
+extern void *sock_kmalloc(struct sock *sk, int size, int priority);
+extern void sock_kfree_s(struct sock *sk, void *mem, int size);
+extern void sk_send_sigurg(struct sock *sk);
+
+/*
+ * Functions to fill in entries in struct proto_ops when a protocol
+ * does not implement a particular function.
+ */
+extern int                      sock_no_bind(struct socket *, 
+					     struct sockaddr *, int);
+extern int                      sock_no_connect(struct socket *,
+						struct sockaddr *, int, int);
+extern int                      sock_no_socketpair(struct socket *,
+						   struct socket *);
+extern int                      sock_no_accept(struct socket *,
+					       struct socket *, int);
+extern int                      sock_no_getname(struct socket *,
+						struct sockaddr *, int *, int);
+extern unsigned int             sock_no_poll(struct file *, struct socket *,
+					     struct poll_table_struct *);
+extern int                      sock_no_ioctl(struct socket *, unsigned int,
+					      unsigned long);
+extern int			sock_no_listen(struct socket *, int);
+extern int                      sock_no_shutdown(struct socket *, int);
+extern int			sock_no_getsockopt(struct socket *, int , int,
+						   char __user *, int __user *);
+extern int			sock_no_setsockopt(struct socket *, int, int,
+						   char __user *, int);
+extern int                      sock_no_sendmsg(struct kiocb *, struct socket *,
+						struct msghdr *, size_t);
+extern int                      sock_no_recvmsg(struct kiocb *, struct socket *,
+						struct msghdr *, size_t, int);
+extern int			sock_no_mmap(struct file *file,
+					     struct socket *sock,
+					     struct vm_area_struct *vma);
+extern ssize_t			sock_no_sendpage(struct socket *sock,
+						struct page *page,
+						int offset, size_t size, 
+						int flags);
+
+/*
+ * Functions to fill in entries in struct proto_ops when a protocol
+ * uses the inet style.
+ */
+extern int sock_common_getsockopt(struct socket *sock, int level, int optname,
+				  char __user *optval, int __user *optlen);
+extern int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock,
+			       struct msghdr *msg, size_t size, int flags);
+extern int sock_common_setsockopt(struct socket *sock, int level, int optname,
+				  char __user *optval, int optlen);
+
+extern void sk_common_release(struct sock *sk);
+
+/*
+ *	Default socket callbacks and setup code
+ */
+ 
+/* Initialise core socket variables */
+extern void sock_init_data(struct socket *sock, struct sock *sk);
+
+/**
+ *	sk_filter - run a packet through a socket filter
+ *	@sk: sock associated with &sk_buff
+ *	@skb: buffer to filter
+ *	@needlock: set to 1 if the sock is not locked by caller.
+ *
+ * Run the filter code and then cut skb->data to correct size returned by
+ * sk_run_filter. If pkt_len is 0 we toss packet. If skb->len is smaller
+ * than pkt_len we keep whole skb->data. This is the socket level
+ * wrapper to sk_run_filter. It returns 0 if the packet should
+ * be accepted or -EPERM if the packet should be tossed.
+ *
+ */
+
+static inline int sk_filter(struct sock *sk, struct sk_buff *skb, int needlock)
+{
+	int err;
+	
+	err = security_sock_rcv_skb(sk, skb);
+	if (err)
+		return err;
+	
+	if (sk->sk_filter) {
+		struct sk_filter *filter;
+		
+		if (needlock)
+			bh_lock_sock(sk);
+		
+		filter = sk->sk_filter;
+		if (filter) {
+			int pkt_len = sk_run_filter(skb, filter->insns,
+						    filter->len);
+			if (!pkt_len)
+				err = -EPERM;
+			else
+				skb_trim(skb, pkt_len);
+		}
+
+		if (needlock)
+			bh_unlock_sock(sk);
+	}
+	return err;
+}
+
+/**
+ *	sk_filter_release: Release a socket filter
+ *	@sk: socket
+ *	@fp: filter to remove
+ *
+ *	Remove a filter from a socket and release its resources.
+ */
+ 
+static inline void sk_filter_release(struct sock *sk, struct sk_filter *fp)
+{
+	unsigned int size = sk_filter_len(fp);
+
+	atomic_sub(size, &sk->sk_omem_alloc);
+
+	if (atomic_dec_and_test(&fp->refcnt))
+		kfree(fp);
+}
+
+static inline void sk_filter_charge(struct sock *sk, struct sk_filter *fp)
+{
+	atomic_inc(&fp->refcnt);
+	atomic_add(sk_filter_len(fp), &sk->sk_omem_alloc);
+}
+
+/*
+ * Socket reference counting postulates.
+ *
+ * * Each user of socket SHOULD hold a reference count.
+ * * Each access point to socket (an hash table bucket, reference from a list,
+ *   running timer, skb in flight MUST hold a reference count.
+ * * When reference count hits 0, it means it will never increase back.
+ * * When reference count hits 0, it means that no references from
+ *   outside exist to this socket and current process on current CPU
+ *   is last user and may/should destroy this socket.
+ * * sk_free is called from any context: process, BH, IRQ. When
+ *   it is called, socket has no references from outside -> sk_free
+ *   may release descendant resources allocated by the socket, but
+ *   to the time when it is called, socket is NOT referenced by any
+ *   hash tables, lists etc.
+ * * Packets, delivered from outside (from network or from another process)
+ *   and enqueued on receive/error queues SHOULD NOT grab reference count,
+ *   when they sit in queue. Otherwise, packets will leak to hole, when
+ *   socket is looked up by one cpu and unhasing is made by another CPU.
+ *   It is true for udp/raw, netlink (leak to receive and error queues), tcp
+ *   (leak to backlog). Packet socket does all the processing inside
+ *   BR_NETPROTO_LOCK, so that it has not this race condition. UNIX sockets
+ *   use separate SMP lock, so that they are prone too.
+ */
+
+/* Ungrab socket and destroy it, if it was the last reference. */
+static inline void sock_put(struct sock *sk)
+{
+	if (atomic_dec_and_test(&sk->sk_refcnt))
+		sk_free(sk);
+}
+
+/* Detach socket from process context.
+ * Announce socket dead, detach it from wait queue and inode.
+ * Note that parent inode held reference count on this struct sock,
+ * we do not release it in this function, because protocol
+ * probably wants some additional cleanups or even continuing
+ * to work with this socket (TCP).
+ */
+static inline void sock_orphan(struct sock *sk)
+{
+	write_lock_bh(&sk->sk_callback_lock);
+	sock_set_flag(sk, SOCK_DEAD);
+	sk->sk_socket = NULL;
+	sk->sk_sleep  = NULL;
+	write_unlock_bh(&sk->sk_callback_lock);
+}
+
+static inline void sock_graft(struct sock *sk, struct socket *parent)
+{
+	write_lock_bh(&sk->sk_callback_lock);
+	sk->sk_sleep = &parent->wait;
+	parent->sk = sk;
+	sk->sk_socket = parent;
+	write_unlock_bh(&sk->sk_callback_lock);
+}
+
+extern int sock_i_uid(struct sock *sk);
+extern unsigned long sock_i_ino(struct sock *sk);
+
+static inline struct dst_entry *
+__sk_dst_get(struct sock *sk)
+{
+	return sk->sk_dst_cache;
+}
+
+static inline struct dst_entry *
+sk_dst_get(struct sock *sk)
+{
+	struct dst_entry *dst;
+
+	read_lock(&sk->sk_dst_lock);
+	dst = sk->sk_dst_cache;
+	if (dst)
+		dst_hold(dst);
+	read_unlock(&sk->sk_dst_lock);
+	return dst;
+}
+
+static inline void
+__sk_dst_set(struct sock *sk, struct dst_entry *dst)
+{
+	struct dst_entry *old_dst;
+
+	old_dst = sk->sk_dst_cache;
+	sk->sk_dst_cache = dst;
+	dst_release(old_dst);
+}
+
+static inline void
+sk_dst_set(struct sock *sk, struct dst_entry *dst)
+{
+	write_lock(&sk->sk_dst_lock);
+	__sk_dst_set(sk, dst);
+	write_unlock(&sk->sk_dst_lock);
+}
+
+static inline void
+__sk_dst_reset(struct sock *sk)
+{
+	struct dst_entry *old_dst;
+
+	old_dst = sk->sk_dst_cache;
+	sk->sk_dst_cache = NULL;
+	dst_release(old_dst);
+}
+
+static inline void
+sk_dst_reset(struct sock *sk)
+{
+	write_lock(&sk->sk_dst_lock);
+	__sk_dst_reset(sk);
+	write_unlock(&sk->sk_dst_lock);
+}
+
+static inline struct dst_entry *
+__sk_dst_check(struct sock *sk, u32 cookie)
+{
+	struct dst_entry *dst = sk->sk_dst_cache;
+
+	if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) {
+		sk->sk_dst_cache = NULL;
+		dst_release(dst);
+		return NULL;
+	}
+
+	return dst;
+}
+
+static inline 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;
+}
+
+static inline void sk_charge_skb(struct sock *sk, struct sk_buff *skb)
+{
+	sk->sk_wmem_queued   += skb->truesize;
+	sk->sk_forward_alloc -= skb->truesize;
+}
+
+static inline int skb_copy_to_page(struct sock *sk, char __user *from,
+				   struct sk_buff *skb, struct page *page,
+				   int off, int copy)
+{
+	if (skb->ip_summed == CHECKSUM_NONE) {
+		int err = 0;
+		unsigned int csum = csum_and_copy_from_user(from,
+						     page_address(page) + off,
+							    copy, 0, &err);
+		if (err)
+			return err;
+		skb->csum = csum_block_add(skb->csum, csum, skb->len);
+	} else if (copy_from_user(page_address(page) + off, from, copy))
+		return -EFAULT;
+
+	skb->len	     += copy;
+	skb->data_len	     += copy;
+	skb->truesize	     += copy;
+	sk->sk_wmem_queued   += copy;
+	sk->sk_forward_alloc -= copy;
+	return 0;
+}
+
+/*
+ * 	Queue a received datagram if it will fit. Stream and sequenced
+ *	protocols can't normally use this as they need to fit buffers in
+ *	and play with them.
+ *
+ * 	Inlined as it's very short and called for pretty much every
+ *	packet ever received.
+ */
+
+static inline void skb_set_owner_w(struct sk_buff *skb, struct sock *sk)
+{
+	sock_hold(sk);
+	skb->sk = sk;
+	skb->destructor = sock_wfree;
+	atomic_add(skb->truesize, &sk->sk_wmem_alloc);
+}
+
+static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
+{
+	skb->sk = sk;
+	skb->destructor = sock_rfree;
+	atomic_add(skb->truesize, &sk->sk_rmem_alloc);
+}
+
+extern void sk_reset_timer(struct sock *sk, struct timer_list* timer,
+			   unsigned long expires);
+
+extern void sk_stop_timer(struct sock *sk, struct timer_list* timer);
+
+static inline int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+	int err = 0;
+	int skb_len;
+
+	/* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
+	   number of warnings when compiling with -W --ANK
+	 */
+	if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
+	    (unsigned)sk->sk_rcvbuf) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	/* It would be deadlock, if sock_queue_rcv_skb is used
+	   with socket lock! We assume that users of this
+	   function are lock free.
+	*/
+	err = sk_filter(sk, skb, 1);
+	if (err)
+		goto out;
+
+	skb->dev = NULL;
+	skb_set_owner_r(skb, sk);
+
+	/* Cache the SKB length before we tack it onto the receive
+	 * queue.  Once it is added it no longer belongs to us and
+	 * may be freed by other threads of control pulling packets
+	 * from the queue.
+	 */
+	skb_len = skb->len;
+
+	skb_queue_tail(&sk->sk_receive_queue, skb);
+
+	if (!sock_flag(sk, SOCK_DEAD))
+		sk->sk_data_ready(sk, skb_len);
+out:
+	return err;
+}
+
+static inline int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb)
+{
+	/* Cast skb->rcvbuf to unsigned... It's pointless, but reduces
+	   number of warnings when compiling with -W --ANK
+	 */
+	if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
+	    (unsigned)sk->sk_rcvbuf)
+		return -ENOMEM;
+	skb_set_owner_r(skb, sk);
+	skb_queue_tail(&sk->sk_error_queue, skb);
+	if (!sock_flag(sk, SOCK_DEAD))
+		sk->sk_data_ready(sk, skb->len);
+	return 0;
+}
+
+/*
+ *	Recover an error report and clear atomically
+ */
+ 
+static inline int sock_error(struct sock *sk)
+{
+	int err = xchg(&sk->sk_err, 0);
+	return -err;
+}
+
+static inline unsigned long sock_wspace(struct sock *sk)
+{
+	int amt = 0;
+
+	if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
+		amt = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
+		if (amt < 0) 
+			amt = 0;
+	}
+	return amt;
+}
+
+static inline void sk_wake_async(struct sock *sk, int how, int band)
+{
+	if (sk->sk_socket && sk->sk_socket->fasync_list)
+		sock_wake_async(sk->sk_socket, how, band);
+}
+
+#define SOCK_MIN_SNDBUF 2048
+#define SOCK_MIN_RCVBUF 256
+
+static inline void sk_stream_moderate_sndbuf(struct sock *sk)
+{
+	if (!(sk->sk_userlocks & SOCK_SNDBUF_LOCK)) {
+		sk->sk_sndbuf = min(sk->sk_sndbuf, sk->sk_wmem_queued / 2);
+		sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF);
+	}
+}
+
+static inline struct sk_buff *sk_stream_alloc_pskb(struct sock *sk,
+						   int size, int mem, int gfp)
+{
+	struct sk_buff *skb = alloc_skb(size + sk->sk_prot->max_header, gfp);
+
+	if (skb) {
+		skb->truesize += mem;
+		if (sk->sk_forward_alloc >= (int)skb->truesize ||
+		    sk_stream_mem_schedule(sk, skb->truesize, 0)) {
+			skb_reserve(skb, sk->sk_prot->max_header);
+			return skb;
+		}
+		__kfree_skb(skb);
+	} else {
+		sk->sk_prot->enter_memory_pressure();
+		sk_stream_moderate_sndbuf(sk);
+	}
+	return NULL;
+}
+
+static inline struct sk_buff *sk_stream_alloc_skb(struct sock *sk,
+						  int size, int gfp)
+{
+	return sk_stream_alloc_pskb(sk, size, 0, gfp);
+}
+
+static inline struct page *sk_stream_alloc_page(struct sock *sk)
+{
+	struct page *page = NULL;
+
+	if (sk->sk_forward_alloc >= (int)PAGE_SIZE ||
+	    sk_stream_mem_schedule(sk, PAGE_SIZE, 0))
+		page = alloc_pages(sk->sk_allocation, 0);
+	else {
+		sk->sk_prot->enter_memory_pressure();
+		sk_stream_moderate_sndbuf(sk);
+	}
+	return page;
+}
+
+#define sk_stream_for_retrans_queue(skb, sk)				\
+		for (skb = (sk)->sk_write_queue.next;			\
+		     (skb != (sk)->sk_send_head) &&			\
+		     (skb != (struct sk_buff *)&(sk)->sk_write_queue);	\
+		     skb = skb->next)
+
+/*
+ *	Default write policy as shown to user space via poll/select/SIGIO
+ */
+static inline int sock_writeable(const struct sock *sk) 
+{
+	return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf / 2);
+}
+
+static inline int gfp_any(void)
+{
+	return in_softirq() ? GFP_ATOMIC : GFP_KERNEL;
+}
+
+static inline long sock_rcvtimeo(const struct sock *sk, int noblock)
+{
+	return noblock ? 0 : sk->sk_rcvtimeo;
+}
+
+static inline long sock_sndtimeo(const struct sock *sk, int noblock)
+{
+	return noblock ? 0 : sk->sk_sndtimeo;
+}
+
+static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len)
+{
+	return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1;
+}
+
+/* Alas, with timeout socket operations are not restartable.
+ * Compare this to poll().
+ */
+static inline int sock_intr_errno(long timeo)
+{
+	return timeo == MAX_SCHEDULE_TIMEOUT ? -ERESTARTSYS : -EINTR;
+}
+
+static __inline__ void
+sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb)
+{
+	struct timeval *stamp = &skb->stamp;
+	if (sock_flag(sk, SOCK_RCVTSTAMP)) {
+		/* Race occurred between timestamp enabling and packet
+		   receiving.  Fill in the current time for now. */
+		if (stamp->tv_sec == 0)
+			do_gettimeofday(stamp);
+		put_cmsg(msg, SOL_SOCKET, SO_TIMESTAMP, sizeof(struct timeval),
+			 stamp);
+	} else
+		sk->sk_stamp = *stamp;
+}
+
+/**
+ * sk_eat_skb - Release a skb if it is no longer needed
+ * @sk - socket to eat this skb from
+ * @skb - socket buffer to eat
+ *
+ * This routine must be called with interrupts disabled or with the socket
+ * locked so that the sk_buff queue operation is ok.
+*/
+static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb)
+{
+	__skb_unlink(skb, &sk->sk_receive_queue);
+	__kfree_skb(skb);
+}
+
+extern void sock_enable_timestamp(struct sock *sk);
+extern int sock_get_timestamp(struct sock *, struct timeval __user *);
+
+/* 
+ *	Enable debug/info messages 
+ */
+
+#if 0
+#define NETDEBUG(x)	do { } while (0)
+#define LIMIT_NETDEBUG(x) do {} while(0)
+#else
+#define NETDEBUG(x)	do { x; } while (0)
+#define LIMIT_NETDEBUG(x) do { if (net_ratelimit()) { x; } } while(0)
+#endif
+
+/*
+ * Macros for sleeping on a socket. Use them like this:
+ *
+ * SOCK_SLEEP_PRE(sk)
+ * if (condition)
+ * 	schedule();
+ * SOCK_SLEEP_POST(sk)
+ *
+ * N.B. These are now obsolete and were, afaik, only ever used in DECnet
+ * and when the last use of them in DECnet has gone, I'm intending to
+ * remove them.
+ */
+
+#define SOCK_SLEEP_PRE(sk) 	{ struct task_struct *tsk = current; \
+				DECLARE_WAITQUEUE(wait, tsk); \
+				tsk->state = TASK_INTERRUPTIBLE; \
+				add_wait_queue((sk)->sk_sleep, &wait); \
+				release_sock(sk);
+
+#define SOCK_SLEEP_POST(sk)	tsk->state = TASK_RUNNING; \
+				remove_wait_queue((sk)->sk_sleep, &wait); \
+				lock_sock(sk); \
+				}
+
+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);
+}
+
+extern __u32 sysctl_wmem_max;
+extern __u32 sysctl_rmem_max;
+
+#ifdef CONFIG_NET
+int siocdevprivate_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg);
+#else
+static inline int siocdevprivate_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
+{
+	return -ENODEV;
+}
+#endif
+
+#endif	/* _SOCK_H */