diff options
Diffstat (limited to 'libdde-linux26/libdde_linux26/contrib/include/net/sock.h')
| -rw-r--r-- | libdde-linux26/libdde_linux26/contrib/include/net/sock.h | 1442 |
1 files changed, 0 insertions, 1442 deletions
diff --git a/libdde-linux26/libdde_linux26/contrib/include/net/sock.h b/libdde-linux26/libdde_linux26/contrib/include/net/sock.h deleted file mode 100644 index eefeeaf7..00000000 --- a/libdde-linux26/libdde_linux26/contrib/include/net/sock.h +++ /dev/null @@ -1,1442 +0,0 @@ -/* - * 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 - * 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/kernel.h> -#include <linux/list.h> -#include <linux/list_nulls.h> -#include <linux/timer.h> -#include <linux/cache.h> -#include <linux/module.h> -#include <linux/lockdep.h> -#include <linux/netdevice.h> -#include <linux/skbuff.h> /* struct sk_buff */ -#include <linux/mm.h> -#include <linux/security.h> - -#include <linux/filter.h> -#include <linux/rculist_nulls.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 -/* Validate arguments and do nothing */ -static void inline int __attribute__ ((format (printf, 2, 3))) -SOCK_DEBUG(struct sock *sk, const char *msg, ...) -{ -} -#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. - */ -typedef struct { - spinlock_t slock; - int owned; - wait_queue_head_t wq; - /* - * We express the mutex-alike socket_lock semantics - * to the lock validator by explicitly managing - * the slock as a lock variant (in addition to - * the slock itself): - */ -#ifdef CONFIG_DEBUG_LOCK_ALLOC - struct lockdep_map dep_map; -#endif -} socket_lock_t; - -struct sock; -struct proto; -struct net; - -/** - * 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_nulls_node: main hash linkage for UDP/UDP-Lite protocol - * @skc_bind_node: bind hash linkage for various protocol lookup tables - * @skc_refcnt: reference count - * @skc_hash: hash value used with various protocol lookup tables - * @skc_prot: protocol handlers inside a network family - * @skc_net: reference to the network namespace of this socket - * - * This is the minimal network layer representation of sockets, the header - * for struct sock and struct inet_timewait_sock. - */ -struct sock_common { - unsigned short skc_family; - volatile unsigned char skc_state; - unsigned char skc_reuse; - int skc_bound_dev_if; - union { - struct hlist_node skc_node; - struct hlist_nulls_node skc_nulls_node; - }; - struct hlist_node skc_bind_node; - atomic_t skc_refcnt; - unsigned int skc_hash; - struct proto *skc_prot; -#ifdef CONFIG_NET_NS - struct net *skc_net; -#endif -}; - -/** - * struct sock - network layer representation of sockets - * @__sk_common: shared layout with inet_timewait_sock - * @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_async_wait_queue: DMA copied packets - * @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_gso_type: GSO type (e.g. %SKB_GSO_TCPV4) - * @sk_gso_max_size: Maximum GSO segment size to build - * @sk_lingertime: %SO_LINGER l_linger setting - * @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_creator: sk_prot of original sock creator (see ipv6_setsockopt, - * IPV6_ADDRFORM for instance) - * @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_drops: raw/udp drops counter - * @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_security: used by security modules - * @sk_mark: generic packet mark - * @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 inet_timewait_sock 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_nulls_node __sk_common.skc_nulls_node -#define sk_bind_node __sk_common.skc_bind_node -#define sk_refcnt __sk_common.skc_refcnt -#define sk_hash __sk_common.skc_hash -#define sk_prot __sk_common.skc_prot -#define sk_net __sk_common.skc_net - 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; - /* - * 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; - wait_queue_head_t *sk_sleep; - struct dst_entry *sk_dst_cache; -#ifdef CONFIG_XFRM - struct xfrm_policy *sk_policy[2]; -#endif - rwlock_t sk_dst_lock; - atomic_t sk_rmem_alloc; - atomic_t sk_wmem_alloc; - atomic_t sk_omem_alloc; - int sk_sndbuf; - struct sk_buff_head sk_receive_queue; - struct sk_buff_head sk_write_queue; -#ifdef CONFIG_NET_DMA - struct sk_buff_head sk_async_wait_queue; -#endif - int sk_wmem_queued; - int sk_forward_alloc; - gfp_t sk_allocation; - int sk_route_caps; - int sk_gso_type; - unsigned int sk_gso_max_size; - int sk_rcvlowat; - unsigned long sk_flags; - unsigned long sk_lingertime; - struct sk_buff_head sk_error_queue; - struct proto *sk_prot_creator; - rwlock_t sk_callback_lock; - int sk_err, - sk_err_soft; - atomic_t sk_drops; - unsigned short sk_ack_backlog; - unsigned short sk_max_ack_backlog; - __u32 sk_priority; - struct ucred sk_peercred; - long sk_rcvtimeo; - long sk_sndtimeo; - struct sk_filter *sk_filter; - void *sk_protinfo; - struct timer_list sk_timer; - ktime_t 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; -#ifdef CONFIG_SECURITY - void *sk_security; -#endif - __u32 sk_mark; - /* XXX 4 bytes hole on 64 bit */ - 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(const struct hlist_head *head) -{ - return hlist_entry(head->first, struct sock, sk_node); -} - -static inline struct sock *sk_head(const struct hlist_head *head) -{ - return hlist_empty(head) ? NULL : __sk_head(head); -} - -static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head) -{ - return hlist_nulls_entry(head->first, struct sock, sk_nulls_node); -} - -static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head) -{ - return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head); -} - -static inline struct sock *sk_next(const struct sock *sk) -{ - return sk->sk_node.next ? - hlist_entry(sk->sk_node.next, struct sock, sk_node) : NULL; -} - -static inline struct sock *sk_nulls_next(const struct sock *sk) -{ - return (!is_a_nulls(sk->sk_nulls_node.next)) ? - hlist_nulls_entry(sk->sk_nulls_node.next, - struct sock, sk_nulls_node) : - NULL; -} - -static inline int sk_unhashed(const struct sock *sk) -{ - return hlist_unhashed(&sk->sk_node); -} - -static inline int sk_hashed(const struct sock *sk) -{ - return !sk_unhashed(sk); -} - -static __inline__ void sk_node_init(struct hlist_node *node) -{ - node->pprev = NULL; -} - -static __inline__ void sk_nulls_node_init(struct hlist_nulls_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__ int __sk_nulls_del_node_init_rcu(struct sock *sk) -{ - if (sk_hashed(sk)) { - hlist_nulls_del_init_rcu(&sk->sk_nulls_node); - return 1; - } - return 0; -} - -static __inline__ int sk_nulls_del_node_init_rcu(struct sock *sk) -{ - int rc = __sk_nulls_del_node_init_rcu(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_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) -{ - hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list); -} - -static __inline__ void sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list) -{ - sock_hold(sk); - __sk_nulls_add_node_rcu(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_nulls_for_each(__sk, node, list) \ - hlist_nulls_for_each_entry(__sk, node, list, sk_nulls_node) -#define sk_nulls_for_each_rcu(__sk, node, list) \ - hlist_nulls_for_each_entry_rcu(__sk, node, list, sk_nulls_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_nulls_for_each_from(__sk, node) \ - if (__sk && ({ node = &(__sk)->sk_nulls_node; 1; })) \ - hlist_nulls_for_each_entry_from(__sk, node, sk_nulls_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_RCVTSTAMPNS, /* %SO_TIMESTAMPNS setting */ - SOCK_LOCALROUTE, /* route locally only, %SO_DONTROUTE setting */ - SOCK_QUEUE_SHRUNK, /* write queue has been shrunk recently */ -}; - -static inline void sock_copy_flags(struct sock *nsk, struct sock *osk) -{ - nsk->sk_flags = osk->sk_flags; -} - -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 >> 1; -} - -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; -} - -/* The per-socket spinlock must be held here. */ -static inline void sk_add_backlog(struct sock *sk, struct sk_buff *skb) -{ - 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; -} - -static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) -{ - return sk->sk_backlog_rcv(sk, skb); -} - -#define sk_wait_event(__sk, __timeo, __condition) \ - ({ int __rc; \ - release_sock(__sk); \ - __rc = __condition; \ - if (!__rc) { \ - *(__timeo) = schedule_timeout(*(__timeo)); \ - } \ - lock_sock(__sk); \ - __rc = __condition; \ - __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); - -struct request_sock_ops; -struct timewait_sock_ops; -struct inet_hashinfo; -struct raw_hashinfo; - -/* 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); - void (*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); -#ifdef CONFIG_COMPAT - int (*compat_setsockopt)(struct sock *sk, - int level, - int optname, char __user *optval, - int optlen); - int (*compat_getsockopt)(struct sock *sk, - int level, - int optname, char __user *optval, - int __user *option); -#endif - 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); - - /* Keeping track of sockets in use */ -#ifdef CONFIG_PROC_FS - unsigned int inuse_idx; -#endif - - /* Memory pressure */ - void (*enter_memory_pressure)(struct sock *sk); - atomic_t *memory_allocated; /* Current allocated memory. */ - struct percpu_counter *sockets_allocated; /* Current number of sockets. */ - /* - * Pressure flag: try to collapse. - * Technical note: it is used by multiple contexts non atomically. - * All the __sk_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; - - struct kmem_cache *slab; - unsigned int obj_size; - int slab_flags; - - struct percpu_counter *orphan_count; - - struct request_sock_ops *rsk_prot; - struct timewait_sock_ops *twsk_prot; - - union { - struct inet_hashinfo *hashinfo; - struct udp_table *udp_table; - struct raw_hashinfo *raw_hash; - } h; - - struct module *owner; - - char name[32]; - - struct list_head node; -#ifdef SOCK_REFCNT_DEBUG - atomic_t socks; -#endif -}; - -extern int proto_register(struct proto *prot, int alloc_slab); -extern void proto_unregister(struct proto *prot); - -#ifdef SOCK_REFCNT_DEBUG -static inline void sk_refcnt_debug_inc(struct sock *sk) -{ - atomic_inc(&sk->sk_prot->socks); -} - -static inline void sk_refcnt_debug_dec(struct sock *sk) -{ - atomic_dec(&sk->sk_prot->socks); - printk(KERN_DEBUG "%s socket %p released, %d are still alive\n", - sk->sk_prot->name, sk, atomic_read(&sk->sk_prot->socks)); -} - -static inline void sk_refcnt_debug_release(const struct sock *sk) -{ - if (atomic_read(&sk->sk_refcnt) != 1) - printk(KERN_DEBUG "Destruction of the %s socket %p delayed, refcnt=%d\n", - sk->sk_prot->name, sk, atomic_read(&sk->sk_refcnt)); -} -#else /* SOCK_REFCNT_DEBUG */ -#define sk_refcnt_debug_inc(sk) do { } while (0) -#define sk_refcnt_debug_dec(sk) do { } while (0) -#define sk_refcnt_debug_release(sk) do { } while (0) -#endif /* SOCK_REFCNT_DEBUG */ - - -#ifdef CONFIG_PROC_FS -/* Called with local bh disabled */ -extern void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc); -extern int sock_prot_inuse_get(struct net *net, struct proto *proto); -#else -static void inline sock_prot_inuse_add(struct net *net, struct proto *prot, - int inc) -{ -} -#endif - - -/* With per-bucket locks this operation is not-atomic, so that - * this version is not worse. - */ -static inline void __sk_prot_rehash(struct sock *sk) -{ - sk->sk_prot->unhash(sk); - sk->sk_prot->hash(sk); -} - -/* 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 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; -} - -/* - * Functions for memory accounting - */ -extern int __sk_mem_schedule(struct sock *sk, int size, int kind); -extern void __sk_mem_reclaim(struct sock *sk); - -#define SK_MEM_QUANTUM ((int)PAGE_SIZE) -#define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM) -#define SK_MEM_SEND 0 -#define SK_MEM_RECV 1 - -static inline int sk_mem_pages(int amt) -{ - return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT; -} - -static inline int sk_has_account(struct sock *sk) -{ - /* return true if protocol supports memory accounting */ - return !!sk->sk_prot->memory_allocated; -} - -static inline int sk_wmem_schedule(struct sock *sk, int size) -{ - if (!sk_has_account(sk)) - return 1; - return size <= sk->sk_forward_alloc || - __sk_mem_schedule(sk, size, SK_MEM_SEND); -} - -static inline int sk_rmem_schedule(struct sock *sk, int size) -{ - if (!sk_has_account(sk)) - return 1; - return size <= sk->sk_forward_alloc || - __sk_mem_schedule(sk, size, SK_MEM_RECV); -} - -static inline void sk_mem_reclaim(struct sock *sk) -{ - if (!sk_has_account(sk)) - return; - if (sk->sk_forward_alloc >= SK_MEM_QUANTUM) - __sk_mem_reclaim(sk); -} - -static inline void sk_mem_reclaim_partial(struct sock *sk) -{ - if (!sk_has_account(sk)) - return; - if (sk->sk_forward_alloc > SK_MEM_QUANTUM) - __sk_mem_reclaim(sk); -} - -static inline void sk_mem_charge(struct sock *sk, int size) -{ - if (!sk_has_account(sk)) - return; - sk->sk_forward_alloc -= size; -} - -static inline void sk_mem_uncharge(struct sock *sk, int size) -{ - if (!sk_has_account(sk)) - return; - sk->sk_forward_alloc += size; -} - -static inline void sk_wmem_free_skb(struct sock *sk, struct sk_buff *skb) -{ - sock_set_flag(sk, SOCK_QUEUE_SHRUNK); - sk->sk_wmem_queued -= skb->truesize; - sk_mem_uncharge(sk, skb->truesize); - __kfree_skb(skb); -} - -/* 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.owned) - -/* - * Macro so as to not evaluate some arguments when - * lockdep is not enabled. - * - * Mark both the sk_lock and the sk_lock.slock as a - * per-address-family lock class. - */ -#define sock_lock_init_class_and_name(sk, sname, skey, name, key) \ -do { \ - sk->sk_lock.owned = 0; \ - init_waitqueue_head(&sk->sk_lock.wq); \ - spin_lock_init(&(sk)->sk_lock.slock); \ - debug_check_no_locks_freed((void *)&(sk)->sk_lock, \ - sizeof((sk)->sk_lock)); \ - lockdep_set_class_and_name(&(sk)->sk_lock.slock, \ - (skey), (sname)); \ - lockdep_init_map(&(sk)->sk_lock.dep_map, (name), (key), 0); \ -} while (0) - -extern void lock_sock_nested(struct sock *sk, int subclass); - -static inline void lock_sock(struct sock *sk) -{ - lock_sock_nested(sk, 0); -} - -extern void 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_lock_sock_nested(__sk) \ - spin_lock_nested(&((__sk)->sk_lock.slock), \ - SINGLE_DEPTH_NESTING) -#define bh_unlock_sock(__sk) spin_unlock(&((__sk)->sk_lock.slock)) - -extern struct sock *sk_alloc(struct net *net, int family, - gfp_t priority, - struct proto *prot); -extern void sk_free(struct sock *sk); -extern void sk_release_kernel(struct sock *sk); -extern struct sock *sk_clone(const struct sock *sk, - const gfp_t priority); - -extern struct sk_buff *sock_wmalloc(struct sock *sk, - unsigned long size, int force, - gfp_t priority); -extern struct sk_buff *sock_rmalloc(struct sock *sk, - unsigned long size, int force, - gfp_t 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, - gfp_t 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 int compat_sock_common_getsockopt(struct socket *sock, int level, - int optname, char __user *optval, int __user *optlen); -extern int compat_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_release: Release a socket filter - * @fp: filter to remove - * - * Remove a filter from a socket and release its resources. - */ - -static inline void sk_filter_release(struct sk_filter *fp) -{ - if (atomic_dec_and_test(&fp->refcnt)) - kfree(fp); -} - -static inline void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp) -{ - unsigned int size = sk_filter_len(fp); - - atomic_sub(size, &sk->sk_omem_alloc); - sk_filter_release(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); -} - -extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb, - const int nested); - -static inline void sk_set_socket(struct sock *sk, struct socket *sock) -{ - sk->sk_socket = sock; -} - -/* 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_set_socket(sk, 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_set_socket(sk, parent); - security_sock_graft(sk, 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); -} - -extern struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie); - -extern struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie); - -static inline int sk_can_gso(const struct sock *sk) -{ - return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type); -} - -extern void sk_setup_caps(struct sock *sk, struct dst_entry *dst); - -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; - __wsum 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_mem_charge(sk, 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); - sk_mem_charge(sk, skb->truesize); -} - -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); - -extern int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb); - -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; - if (likely(!sk->sk_err)) - return 0; - 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 >> 1); - sk->sk_sndbuf = max(sk->sk_sndbuf, SOCK_MIN_SNDBUF); - } -} - -struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp); - -static inline struct page *sk_stream_alloc_page(struct sock *sk) -{ - struct page *page = NULL; - - page = alloc_pages(sk->sk_allocation, 0); - if (!page) { - sk->sk_prot->enter_memory_pressure(sk); - sk_stream_moderate_sndbuf(sk); - } - return page; -} - -/* - * 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 >> 1); -} - -static inline gfp_t 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; -} - -extern void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk, - struct sk_buff *skb); - -static __inline__ void -sock_recv_timestamp(struct msghdr *msg, struct sock *sk, struct sk_buff *skb) -{ - ktime_t kt = skb->tstamp; - - if (sock_flag(sk, SOCK_RCVTSTAMP)) - __sock_recv_timestamp(msg, sk, skb); - else - sk->sk_stamp = kt; -} - -/** - * sk_eat_skb - Release a skb if it is no longer needed - * @sk: socket to eat this skb from - * @skb: socket buffer to eat - * @copied_early: flag indicating whether DMA operations copied this data early - * - * This routine must be called with interrupts disabled or with the socket - * locked so that the sk_buff queue operation is ok. -*/ -#ifdef CONFIG_NET_DMA -static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) -{ - __skb_unlink(skb, &sk->sk_receive_queue); - if (!copied_early) - __kfree_skb(skb); - else - __skb_queue_tail(&sk->sk_async_wait_queue, skb); -} -#else -static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb, int copied_early) -{ - __skb_unlink(skb, &sk->sk_receive_queue); - __kfree_skb(skb); -} -#endif - -static inline -struct net *sock_net(const struct sock *sk) -{ -#ifdef CONFIG_NET_NS - return sk->sk_net; -#else - return &init_net; -#endif -} - -static inline -void sock_net_set(struct sock *sk, struct net *net) -{ -#ifdef CONFIG_NET_NS - sk->sk_net = net; -#endif -} - -/* - * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace. - * They should not hold a referrence to a namespace in order to allow - * to stop it. - * Sockets after sk_change_net should be released using sk_release_kernel - */ -static inline void sk_change_net(struct sock *sk, struct net *net) -{ - put_net(sock_net(sk)); - sock_net_set(sk, hold_net(net)); -} - -static inline struct sock *skb_steal_sock(struct sk_buff *skb) -{ - if (unlikely(skb->sk)) { - struct sock *sk = skb->sk; - - skb->destructor = NULL; - skb->sk = NULL; - return sk; - } - return NULL; -} - -extern void sock_enable_timestamp(struct sock *sk); -extern int sock_get_timestamp(struct sock *, struct timeval __user *); -extern int sock_get_timestampns(struct sock *, struct timespec __user *); - -/* - * Enable debug/info messages - */ -extern int net_msg_warn; -#define NETDEBUG(fmt, args...) \ - do { if (net_msg_warn) printk(fmt,##args); } while (0) - -#define LIMIT_NETDEBUG(fmt, args...) \ - do { if (net_msg_warn && net_ratelimit()) printk(fmt,##args); } while(0) - -extern __u32 sysctl_wmem_max; -extern __u32 sysctl_rmem_max; - -extern void sk_init(void); - -extern int sysctl_optmem_max; - -extern __u32 sysctl_wmem_default; -extern __u32 sysctl_rmem_default; - -#endif /* _SOCK_H */ |