[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/include/net/sock.h b/ap/os/linux/linux-3.4.x/include/net/sock.h
new file mode 100755
index 0000000..efab120
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/include/net/sock.h
@@ -0,0 +1,2183 @@
+/*
+ * 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/hardirq.h>
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/list_nulls.h>
+#include <linux/timer.h>
+#include <linux/cache.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/slab.h>
+#include <linux/uaccess.h>
+#include <linux/memcontrol.h>
+#include <linux/res_counter.h>
+#include <linux/static_key.h>
+#include <linux/aio.h>
+#include <linux/sched.h>
+
+#include <linux/filter.h>
+#include <linux/rculist_nulls.h>
+#include <linux/poll.h>
+
+#include <linux/atomic.h>
+#include <net/dst.h>
+#include <net/checksum.h>
+
+#include <net/SI/sock_track.h>
+
+struct cgroup;
+struct cgroup_subsys;
+#ifdef CONFIG_NET
+int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss);
+void mem_cgroup_sockets_destroy(struct cgroup *cgrp);
+#else
+static inline
+int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss)
+{
+ return 0;
+}
+static inline
+void mem_cgroup_sockets_destroy(struct cgroup *cgrp)
+{
+}
+#endif
+/*
+ * 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 inline __printf(2, 3)
+void 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_daddr: Foreign IPv4 addr
+ * @skc_rcv_saddr: Bound local IPv4 addr
+ * @skc_hash: hash value used with various protocol lookup tables
+ * @skc_u16hashes: two u16 hash values used by UDP lookup tables
+ * @skc_family: network address family
+ * @skc_state: Connection state
+ * @skc_reuse: %SO_REUSEADDR setting
+ * @skc_bound_dev_if: bound device index if != 0
+ * @skc_bind_node: bind hash linkage for various protocol lookup tables
+ * @skc_portaddr_node: second hash linkage for UDP/UDP-Lite protocol
+ * @skc_prot: protocol handlers inside a network family
+ * @skc_net: reference to the network namespace of this socket
+ * @skc_node: main hash linkage for various protocol lookup tables
+ * @skc_nulls_node: main hash linkage for TCP/UDP/UDP-Lite protocol
+ * @skc_tx_queue_mapping: tx queue number for this connection
+ * @skc_refcnt: reference count
+ *
+ * This is the minimal network layer representation of sockets, the header
+ * for struct sock and struct inet_timewait_sock.
+ */
+struct sock_common {
+ /* skc_daddr and skc_rcv_saddr must be grouped :
+ * cf INET_MATCH() and INET_TW_MATCH()
+ */
+ __be32 skc_daddr;
+ __be32 skc_rcv_saddr;
+
+ union {
+ unsigned int skc_hash;
+ __u16 skc_u16hashes[2];
+ };
+ unsigned short skc_family;
+ volatile unsigned char skc_state;
+ unsigned char skc_reuse;
+ int skc_bound_dev_if;
+ union {
+ struct hlist_node skc_bind_node;
+ struct hlist_nulls_node skc_portaddr_node;
+ };
+ struct proto *skc_prot;
+#ifdef CONFIG_NET_NS
+ struct net *skc_net;
+#endif
+ /*
+ * fields between dontcopy_begin/dontcopy_end
+ * are not copied in sock_copy()
+ */
+ /* private: */
+ int skc_dontcopy_begin[0];
+ /* public: */
+ union {
+ struct hlist_node skc_node;
+ struct hlist_nulls_node skc_nulls_node;
+ };
+ int skc_tx_queue_mapping;
+ atomic_t skc_refcnt;
+ /* private: */
+ int skc_dontcopy_end[0];
+ /* public: */
+};
+
+struct cg_proto;
+/**
+ * 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_wq: sock wait queue and async head
+ * @sk_dst_cache: destination cache
+ * @sk_dst_lock: destination cache lock
+ * @sk_policy: flow policy
+ * @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, %SO_TIMESTAMPING settings
+ * @sk_no_check: %SO_NO_CHECK setting, wether or not checkup packets
+ * @sk_route_caps: route capabilities (e.g. %NETIF_F_TSO)
+ * @sk_route_nocaps: forbidden route capabilities (e.g NETIF_F_GSO_MASK)
+ * @sk_gso_type: GSO type (e.g. %SKB_GSO_TCPV4)
+ * @sk_gso_max_size: Maximum GSO segment size to build
+ * @sk_gso_max_segs: Maximum number of GSO segments
+ * @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_cgrp_prioidx: socket group's priority map index
+ * @sk_type: socket type (%SOCK_STREAM, etc)
+ * @sk_protocol: which protocol this socket belongs in this network family
+ * @sk_peer_pid: &struct pid for this socket's peer
+ * @sk_peer_cred: %SO_PEERCRED setting
+ * @sk_rcvlowat: %SO_RCVLOWAT setting
+ * @sk_rcvtimeo: %SO_RCVTIMEO setting
+ * @sk_sndtimeo: %SO_SNDTIMEO setting
+ * @sk_rxhash: flow hash received from netif layer
+ * @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_peek_off: current peek_offset value
+ * @sk_send_head: front of stuff to transmit
+ * @sk_security: used by security modules
+ * @sk_mark: generic packet mark
+ * @sk_classid: this socket's cgroup classid
+ * @sk_cgrp: this socket's cgroup-specific proto data
+ * @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_node __sk_common.skc_node
+#define sk_nulls_node __sk_common.skc_nulls_node
+#define sk_refcnt __sk_common.skc_refcnt
+#define sk_tx_queue_mapping __sk_common.skc_tx_queue_mapping
+
+#define sk_dontcopy_begin __sk_common.skc_dontcopy_begin
+#define sk_dontcopy_end __sk_common.skc_dontcopy_end
+#define sk_hash __sk_common.skc_hash
+#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_bind_node __sk_common.skc_bind_node
+#define sk_prot __sk_common.skc_prot
+#define sk_net __sk_common.skc_net
+ socket_lock_t sk_lock;
+ struct sk_buff_head sk_receive_queue;
+ /*
+ * 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.
+ * Note : rmem_alloc is in this structure to fill a hole
+ * on 64bit arches, not because its logically part of
+ * backlog.
+ */
+ struct {
+ atomic_t rmem_alloc;
+ int len;
+ struct sk_buff *head;
+ struct sk_buff *tail;
+ } sk_backlog;
+#define sk_rmem_alloc sk_backlog.rmem_alloc
+ int sk_forward_alloc;
+#ifdef CONFIG_RPS
+ __u32 sk_rxhash;
+#endif
+ atomic_t sk_drops;
+ int sk_rcvbuf;
+ struct sk_filter __rcu *sk_filter;
+ struct socket_wq __rcu *sk_wq;
+
+#ifdef CONFIG_NET_DMA
+ struct sk_buff_head sk_async_wait_queue;
+#endif
+
+#ifdef CONFIG_XFRM
+ struct xfrm_policy *sk_policy[2];
+#endif
+ unsigned long sk_flags;
+ struct dst_entry *sk_dst_cache;
+ spinlock_t sk_dst_lock;
+ atomic_t sk_wmem_alloc;
+ atomic_t sk_omem_alloc;
+ int sk_sndbuf;
+ struct sk_buff_head sk_write_queue;
+ kmemcheck_bitfield_begin(flags);
+ unsigned int sk_shutdown : 2,
+ sk_no_check : 2,
+ sk_userlocks : 4,
+ sk_protocol : 8,
+#define SK_PROTOCOL_MAX U8_MAX //CVE-2015-8543
+ sk_type : 16;
+ kmemcheck_bitfield_end(flags);
+ int sk_wmem_queued;
+ gfp_t sk_allocation;
+ netdev_features_t sk_route_caps;
+ netdev_features_t sk_route_nocaps;
+ int sk_gso_type;
+ unsigned int sk_gso_max_size;
+ u16 sk_gso_max_segs;
+ int sk_rcvlowat;
+ 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;
+ unsigned short sk_ack_backlog;
+ unsigned short sk_max_ack_backlog;
+ __u32 sk_priority;
+#ifdef CONFIG_CGROUPS
+ __u32 sk_cgrp_prioidx;
+#endif
+ struct pid *sk_peer_pid;
+ const struct cred *sk_peer_cred;
+ long sk_rcvtimeo;
+ long sk_sndtimeo;
+ 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;
+ __s32 sk_peek_off;
+ int sk_write_pending;
+#ifdef CONFIG_SECURITY
+ void *sk_security;
+#endif
+ __u32 sk_mark;
+ u32 sk_classid;
+ struct cg_proto *sk_cgrp;
+ unsigned long sk_send_sum; //µ½Ä¿Ç°ÎªÖ¹·¢ËͳöÈ¥µÄÊý¾Ý°ü×ܸöÊý
+ int conn_list_init; //¼Ç¼µÄconnÁ´±íÊÇ·ñ³õʼ»¯
+ struct list_head conn_head; //connÁ´±í
+ 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);
+};
+
+static inline int sk_peek_offset(struct sock *sk, int flags)
+{
+ if ((flags & MSG_PEEK) && (sk->sk_peek_off >= 0))
+ return sk->sk_peek_off;
+ else
+ return 0;
+}
+
+static inline void sk_peek_offset_bwd(struct sock *sk, int val)
+{
+ if (sk->sk_peek_off >= 0) {
+ if (sk->sk_peek_off >= val)
+ sk->sk_peek_off -= val;
+ else
+ sk->sk_peek_off = 0;
+ }
+}
+
+static inline void sk_peek_offset_fwd(struct sock *sk, int val)
+{
+ if (sk->sk_peek_off >= 0)
+ sk->sk_peek_off += val;
+}
+
+/*
+ * Hashed lists helper routines
+ */
+static inline struct sock *sk_entry(const struct hlist_node *node)
+{
+ return hlist_entry(node, struct sock, sk_node);
+}
+
+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);
+}
+
+/* NB: equivalent to hlist_del_init_rcu */
+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;
+}
+#define sk_del_node_init_rcu(sk) sk_del_node_init(sk)
+
+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_add_node_rcu(struct sock *sk, struct hlist_head *list)
+{
+ sock_hold(sk);
+ hlist_add_head_rcu(&sk->sk_node, 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_for_each_rcu(__sk, node, list) \
+ hlist_for_each_entry_rcu(__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_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 */
+ SOCK_TIMESTAMPING_TX_HARDWARE, /* %SOF_TIMESTAMPING_TX_HARDWARE */
+ SOCK_TIMESTAMPING_TX_SOFTWARE, /* %SOF_TIMESTAMPING_TX_SOFTWARE */
+ SOCK_TIMESTAMPING_RX_HARDWARE, /* %SOF_TIMESTAMPING_RX_HARDWARE */
+ SOCK_TIMESTAMPING_RX_SOFTWARE, /* %SOF_TIMESTAMPING_RX_SOFTWARE */
+ SOCK_TIMESTAMPING_SOFTWARE, /* %SOF_TIMESTAMPING_SOFTWARE */
+ SOCK_TIMESTAMPING_RAW_HARDWARE, /* %SOF_TIMESTAMPING_RAW_HARDWARE */
+ SOCK_TIMESTAMPING_SYS_HARDWARE, /* %SOF_TIMESTAMPING_SYS_HARDWARE */
+ SOCK_FASYNC, /* fasync() active */
+ SOCK_RXQ_OVFL,
+ SOCK_ZEROCOPY, /* buffers from userspace */
+ SOCK_WIFI_STATUS, /* push wifi status to userspace */
+ SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS.
+ * Will use last 4 bytes of packet sent from
+ * user-space instead.
+ */
+};
+
+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;
+}
+
+/* OOB backlog add */
+static inline void __sk_add_backlog(struct sock *sk, struct sk_buff *skb)
+{
+ /* dont let skb dst not refcounted, we are going to leave rcu lock */
+ skb_dst_force(skb);
+
+ if (!sk->sk_backlog.tail)
+ sk->sk_backlog.head = skb;
+ else
+ sk->sk_backlog.tail->next = skb;
+
+ sk->sk_backlog.tail = skb;
+ skb->next = NULL;
+}
+
+/*
+ * Take into account size of receive queue and backlog queue
+ * Do not take into account this skb truesize,
+ * to allow even a single big packet to come.
+ */
+static inline bool sk_rcvqueues_full(const struct sock *sk, const struct sk_buff *skb)
+{
+ unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc);
+
+ return qsize > sk->sk_rcvbuf;
+}
+
+/* The per-socket spinlock must be held here. */
+static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb)
+{
+ if (sk_rcvqueues_full(sk, skb))
+ {
+ TCP_SOCK_TRACK(sk, TCP_RECV_BUFF_FULL);
+ return -ENOBUFS;
+ }
+
+ __sk_add_backlog(sk, skb);
+ sk->sk_backlog.len += skb->truesize;
+ return 0;
+}
+
+static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ return sk->sk_backlog_rcv(sk, skb);
+}
+
+static inline void sock_rps_record_flow(const struct sock *sk)
+{
+#ifdef CONFIG_RPS
+ struct rps_sock_flow_table *sock_flow_table;
+
+ rcu_read_lock();
+ sock_flow_table = rcu_dereference(rps_sock_flow_table);
+ rps_record_sock_flow(sock_flow_table, sk->sk_rxhash);
+ rcu_read_unlock();
+#endif
+}
+
+static inline void sock_rps_reset_flow(const struct sock *sk)
+{
+#ifdef CONFIG_RPS
+ struct rps_sock_flow_table *sock_flow_table;
+
+ rcu_read_lock();
+ sock_flow_table = rcu_dereference(rps_sock_flow_table);
+ rps_reset_sock_flow(sock_flow_table, sk->sk_rxhash);
+ rcu_read_unlock();
+#endif
+}
+
+static inline void sock_rps_save_rxhash(struct sock *sk,
+ const struct sk_buff *skb)
+{
+#ifdef CONFIG_RPS
+ if (unlikely(sk->sk_rxhash != skb->rxhash)) {
+ sock_rps_reset_flow(sk);
+ sk->sk_rxhash = skb->rxhash;
+ }
+#endif
+}
+
+static inline void sock_rps_reset_rxhash(struct sock *sk)
+{
+#ifdef CONFIG_RPS
+ sock_rps_reset_flow(sk);
+ sk->sk_rxhash = 0;
+#endif
+}
+
+#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;
+struct module;
+
+/*
+ * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes
+ * un-modified. Special care is taken when initializing object to zero.
+ */
+static inline void sk_prot_clear_nulls(struct sock *sk, int size)
+{
+ if (offsetof(struct sock, sk_node.next) != 0)
+ memset(sk, 0, offsetof(struct sock, sk_node.next));
+ memset(&sk->sk_node.pprev, 0,
+ size - offsetof(struct sock, sk_node.pprev));
+}
+
+/* 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,
+ unsigned 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,
+ unsigned int optlen);
+ int (*compat_getsockopt)(struct sock *sk,
+ int level,
+ int optname, char __user *optval,
+ int __user *option);
+ int (*compat_ioctl)(struct sock *sk,
+ unsigned int cmd, unsigned long arg);
+#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);
+ void (*rehash)(struct sock *sk);
+ int (*get_port)(struct sock *sk, unsigned short snum);
+ void (*clear_sk)(struct sock *sk, int size);
+
+ /* 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_long_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;
+ long *sysctl_mem;
+ int *sysctl_wmem;
+ int *sysctl_rmem;
+ int max_header;
+ bool no_autobind;
+
+ 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
+#ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM
+ /*
+ * cgroup specific init/deinit functions. Called once for all
+ * protocols that implement it, from cgroups populate function.
+ * This function has to setup any files the protocol want to
+ * appear in the kmem cgroup filesystem.
+ */
+ int (*init_cgroup)(struct cgroup *cgrp,
+ struct cgroup_subsys *ss);
+ void (*destroy_cgroup)(struct cgroup *cgrp);
+ struct cg_proto *(*proto_cgroup)(struct mem_cgroup *memcg);
+#endif
+};
+
+struct cg_proto {
+ void (*enter_memory_pressure)(struct sock *sk);
+ struct res_counter *memory_allocated; /* Current allocated memory. */
+ struct percpu_counter *sockets_allocated; /* Current number of sockets. */
+ int *memory_pressure;
+ long *sysctl_mem;
+ /*
+ * memcg field is used to find which memcg we belong directly
+ * Each memcg struct can hold more than one cg_proto, so container_of
+ * won't really cut.
+ *
+ * The elegant solution would be having an inverse function to
+ * proto_cgroup in struct proto, but that means polluting the structure
+ * for everybody, instead of just for memcg users.
+ */
+ struct mem_cgroup *memcg;
+};
+
+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 */
+
+#if defined(CONFIG_CGROUP_MEM_RES_CTLR_KMEM) && defined(CONFIG_NET)
+extern struct static_key memcg_socket_limit_enabled;
+static inline struct cg_proto *parent_cg_proto(struct proto *proto,
+ struct cg_proto *cg_proto)
+{
+ return proto->proto_cgroup(parent_mem_cgroup(cg_proto->memcg));
+}
+#define mem_cgroup_sockets_enabled static_key_false(&memcg_socket_limit_enabled)
+#else
+#define mem_cgroup_sockets_enabled 0
+static inline struct cg_proto *parent_cg_proto(struct proto *proto,
+ struct cg_proto *cg_proto)
+{
+ return NULL;
+}
+#endif
+
+
+static inline bool sk_has_memory_pressure(const struct sock *sk)
+{
+ return sk->sk_prot->memory_pressure != NULL;
+}
+
+static inline bool sk_under_memory_pressure(const struct sock *sk)
+{
+ if (!sk->sk_prot->memory_pressure)
+ return false;
+
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
+ return !!*sk->sk_cgrp->memory_pressure;
+
+ return !!*sk->sk_prot->memory_pressure;
+}
+
+static inline void sk_leave_memory_pressure(struct sock *sk)
+{
+ int *memory_pressure = sk->sk_prot->memory_pressure;
+
+ if (!memory_pressure)
+ return;
+
+ if (*memory_pressure)
+ *memory_pressure = 0;
+
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
+ struct cg_proto *cg_proto = sk->sk_cgrp;
+ struct proto *prot = sk->sk_prot;
+
+ for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
+ if (*cg_proto->memory_pressure)
+ *cg_proto->memory_pressure = 0;
+ }
+
+}
+
+static inline void sk_enter_memory_pressure(struct sock *sk)
+{
+ if (!sk->sk_prot->enter_memory_pressure)
+ return;
+
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
+ struct cg_proto *cg_proto = sk->sk_cgrp;
+ struct proto *prot = sk->sk_prot;
+
+ for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
+ cg_proto->enter_memory_pressure(sk);
+ }
+
+ sk->sk_prot->enter_memory_pressure(sk);
+}
+
+static inline long sk_prot_mem_limits(const struct sock *sk, int index)
+{
+ long *prot = sk->sk_prot->sysctl_mem;
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
+ prot = sk->sk_cgrp->sysctl_mem;
+ return prot[index];
+}
+
+static inline void memcg_memory_allocated_add(struct cg_proto *prot,
+ unsigned long amt,
+ int *parent_status)
+{
+ struct res_counter *fail;
+ int ret;
+
+ ret = res_counter_charge_nofail(prot->memory_allocated,
+ amt << PAGE_SHIFT, &fail);
+ if (ret < 0)
+ *parent_status = OVER_LIMIT;
+}
+
+static inline void memcg_memory_allocated_sub(struct cg_proto *prot,
+ unsigned long amt)
+{
+ res_counter_uncharge(prot->memory_allocated, amt << PAGE_SHIFT);
+}
+
+static inline u64 memcg_memory_allocated_read(struct cg_proto *prot)
+{
+ u64 ret;
+ ret = res_counter_read_u64(prot->memory_allocated, RES_USAGE);
+ return ret >> PAGE_SHIFT;
+}
+
+static inline long
+sk_memory_allocated(const struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
+ return memcg_memory_allocated_read(sk->sk_cgrp);
+
+ return atomic_long_read(prot->memory_allocated);
+}
+
+static inline long
+sk_memory_allocated_add(struct sock *sk, int amt, int *parent_status)
+{
+ struct proto *prot = sk->sk_prot;
+
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
+ memcg_memory_allocated_add(sk->sk_cgrp, amt, parent_status);
+ /* update the root cgroup regardless */
+ atomic_long_add_return(amt, prot->memory_allocated);
+ return memcg_memory_allocated_read(sk->sk_cgrp);
+ }
+
+ return atomic_long_add_return(amt, prot->memory_allocated);
+}
+
+static inline void
+sk_memory_allocated_sub(struct sock *sk, int amt)
+{
+ struct proto *prot = sk->sk_prot;
+
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
+ memcg_memory_allocated_sub(sk->sk_cgrp, amt);
+
+ atomic_long_sub(amt, prot->memory_allocated);
+}
+
+static inline void sk_sockets_allocated_dec(struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
+ struct cg_proto *cg_proto = sk->sk_cgrp;
+
+ for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
+ percpu_counter_dec(cg_proto->sockets_allocated);
+ }
+
+ percpu_counter_dec(prot->sockets_allocated);
+}
+
+static inline void sk_sockets_allocated_inc(struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp) {
+ struct cg_proto *cg_proto = sk->sk_cgrp;
+
+ for (; cg_proto; cg_proto = parent_cg_proto(prot, cg_proto))
+ percpu_counter_inc(cg_proto->sockets_allocated);
+ }
+
+ percpu_counter_inc(prot->sockets_allocated);
+}
+
+static inline int
+sk_sockets_allocated_read_positive(struct sock *sk)
+{
+ struct proto *prot = sk->sk_prot;
+
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
+ return percpu_counter_read_positive(sk->sk_cgrp->sockets_allocated);
+
+ return percpu_counter_read_positive(prot->sockets_allocated);
+}
+
+static inline int
+proto_sockets_allocated_sum_positive(struct proto *prot)
+{
+ return percpu_counter_sum_positive(prot->sockets_allocated);
+}
+
+static inline long
+proto_memory_allocated(struct proto *prot)
+{
+ return atomic_long_read(prot->memory_allocated);
+}
+
+static inline bool
+proto_memory_pressure(struct proto *prot)
+{
+ if (!prot->memory_pressure)
+ return false;
+ return !!*prot->memory_pressure;
+}
+
+
+#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);
+}
+
+void sk_prot_clear_portaddr_nulls(struct sock *sk, int size);
+
+/* 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 bool lock_sock_fast(struct sock *sk);
+/**
+ * unlock_sock_fast - complement of lock_sock_fast
+ * @sk: socket
+ * @slow: slow mode
+ *
+ * fast unlock socket for user context.
+ * If slow mode is on, we call regular release_sock()
+ */
+static inline void unlock_sock_fast(struct sock *sk, bool slow)
+{
+ if (slow)
+ release_sock(sk);
+ else
+ spin_unlock_bh(&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_lock(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,
+ unsigned 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 struct sk_buff *sock_alloc_send_pskb(struct sock *sk,
+ unsigned long header_len,
+ unsigned long data_len,
+ 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);
+
+#ifdef CONFIG_CGROUPS
+extern void sock_update_classid(struct sock *sk);
+#else
+static inline void sock_update_classid(struct sock *sk)
+{
+}
+#endif
+
+/*
+ * 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 *, unsigned 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, unsigned 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, unsigned 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);
+
+extern void sk_filter_release_rcu(struct rcu_head *rcu);
+
+/**
+ * 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))
+ call_rcu(&fp->rcu, sk_filter_release_rcu);
+}
+
+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. */
+//ʵÏַŵ½sock.cÖУ¬ÒÔ±ãÌí¼Ó×ÔÑдúÂë
+void sock_put(struct sock *sk);
+#if 0
+static inline void sock_put(struct sock *sk)
+{
+ if (atomic_dec_and_test(&sk->sk_refcnt))
+ sk_free(sk);
+}
+#endif
+extern int sk_receive_skb(struct sock *sk, struct sk_buff *skb,
+ const int nested);
+
+static inline void sk_tx_queue_set(struct sock *sk, int tx_queue)
+{
+ sk->sk_tx_queue_mapping = tx_queue;
+}
+
+static inline void sk_tx_queue_clear(struct sock *sk)
+{
+ sk->sk_tx_queue_mapping = -1;
+}
+
+static inline int sk_tx_queue_get(const struct sock *sk)
+{
+ return sk ? sk->sk_tx_queue_mapping : -1;
+}
+
+static inline void sk_set_socket(struct sock *sk, struct socket *sock)
+{
+ sk_tx_queue_clear(sk);
+ sk->sk_socket = sock;
+}
+
+static inline wait_queue_head_t *sk_sleep(struct sock *sk)
+{
+ BUILD_BUG_ON(offsetof(struct socket_wq, wait) != 0);
+ return &rcu_dereference_raw(sk->sk_wq)->wait;
+}
+/* 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_wq = 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_wq = parent->wq;
+ 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 rcu_dereference_check(sk->sk_dst_cache, sock_owned_by_user(sk) ||
+ lockdep_is_held(&sk->sk_lock.slock));
+}
+
+static inline struct dst_entry *
+sk_dst_get(struct sock *sk)
+{
+ struct dst_entry *dst;
+
+ rcu_read_lock();
+ dst = rcu_dereference(sk->sk_dst_cache);
+ if (dst)
+ dst_hold(dst);
+ rcu_read_unlock();
+ return dst;
+}
+
+extern void sk_reset_txq(struct sock *sk);
+
+static inline void dst_negative_advice(struct sock *sk)
+{
+ struct dst_entry *ndst, *dst = __sk_dst_get(sk);
+
+ if (dst && dst->ops->negative_advice) {
+ ndst = dst->ops->negative_advice(dst);
+
+ if (ndst != dst) {
+ rcu_assign_pointer(sk->sk_dst_cache, ndst);
+ sk_reset_txq(sk);
+ }
+ }
+}
+
+static inline void
+__sk_dst_set(struct sock *sk, struct dst_entry *dst)
+{
+ struct dst_entry *old_dst;
+
+ sk_tx_queue_clear(sk);
+ /*
+ * This can be called while sk is owned by the caller only,
+ * with no state that can be checked in a rcu_dereference_check() cond
+ */
+ old_dst = rcu_dereference_raw(sk->sk_dst_cache);
+ rcu_assign_pointer(sk->sk_dst_cache, dst);
+ dst_release(old_dst);
+}
+
+static inline void
+sk_dst_set(struct sock *sk, struct dst_entry *dst)
+{
+ spin_lock(&sk->sk_dst_lock);
+ __sk_dst_set(sk, dst);
+ spin_unlock(&sk->sk_dst_lock);
+}
+
+static inline void
+__sk_dst_reset(struct sock *sk)
+{
+ __sk_dst_set(sk, NULL);
+}
+
+static inline void
+sk_dst_reset(struct sock *sk)
+{
+ spin_lock(&sk->sk_dst_lock);
+ __sk_dst_reset(sk);
+ spin_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 void sk_nocaps_add(struct sock *sk, netdev_features_t flags)
+{
+ sk->sk_route_nocaps |= flags;
+ sk->sk_route_caps &= ~flags;
+}
+
+static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb,
+ char __user *from, char *to,
+ int copy, int offset)
+{
+ if (skb->ip_summed == CHECKSUM_NONE) {
+ int err = 0;
+ __wsum csum = csum_and_copy_from_user(from, to, copy, 0, &err);
+ if (err)
+ return err;
+ skb->csum = csum_block_add(skb->csum, csum, offset);
+ } else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) {
+ if (!access_ok(VERIFY_READ, from, copy) ||
+ __copy_from_user_nocache(to, from, copy))
+ return -EFAULT;
+ } else if (copy_from_user(to, from, copy))
+ return -EFAULT;
+
+ return 0;
+}
+
+static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb,
+ char __user *from, int copy)
+{
+ int err, offset = skb->len;
+
+ err = skb_do_copy_data_nocache(sk, skb, from, skb_put(skb, copy),
+ copy, offset);
+ if (err)
+ __skb_trim(skb, offset);
+
+ return err;
+}
+
+static inline int skb_copy_to_page_nocache(struct sock *sk, char __user *from,
+ struct sk_buff *skb,
+ struct page *page,
+ int off, int copy)
+{
+ int err;
+
+ err = skb_do_copy_data_nocache(sk, skb, from, page_address(page) + off,
+ copy, skb->len);
+ if (err)
+ return err;
+
+ skb->len += copy;
+ skb->data_len += copy;
+ skb->truesize += copy;
+ sk->sk_wmem_queued += copy;
+ sk_mem_charge(sk, copy);
+ return 0;
+}
+
+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;
+}
+
+/**
+ * sk_wmem_alloc_get - returns write allocations
+ * @sk: socket
+ *
+ * Returns sk_wmem_alloc minus initial offset of one
+ */
+static inline int sk_wmem_alloc_get(const struct sock *sk)
+{
+ return atomic_read(&sk->sk_wmem_alloc) - 1;
+}
+
+/**
+ * sk_rmem_alloc_get - returns read allocations
+ * @sk: socket
+ *
+ * Returns sk_rmem_alloc
+ */
+static inline int sk_rmem_alloc_get(const struct sock *sk)
+{
+ return atomic_read(&sk->sk_rmem_alloc);
+}
+
+/**
+ * sk_has_allocations - check if allocations are outstanding
+ * @sk: socket
+ *
+ * Returns true if socket has write or read allocations
+ */
+static inline int sk_has_allocations(const struct sock *sk)
+{
+ return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk);
+}
+
+/**
+ * wq_has_sleeper - check if there are any waiting processes
+ * @wq: struct socket_wq
+ *
+ * Returns true if socket_wq has waiting processes
+ *
+ * The purpose of the wq_has_sleeper and sock_poll_wait is to wrap the memory
+ * barrier call. They were added due to the race found within the tcp code.
+ *
+ * Consider following tcp code paths:
+ *
+ * CPU1 CPU2
+ *
+ * sys_select receive packet
+ * ... ...
+ * __add_wait_queue update tp->rcv_nxt
+ * ... ...
+ * tp->rcv_nxt check sock_def_readable
+ * ... {
+ * schedule rcu_read_lock();
+ * wq = rcu_dereference(sk->sk_wq);
+ * if (wq && waitqueue_active(&wq->wait))
+ * wake_up_interruptible(&wq->wait)
+ * ...
+ * }
+ *
+ * The race for tcp fires when the __add_wait_queue changes done by CPU1 stay
+ * in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1
+ * could then endup calling schedule and sleep forever if there are no more
+ * data on the socket.
+ *
+ */
+static inline bool wq_has_sleeper(struct socket_wq *wq)
+{
+
+ /*
+ * We need to be sure we are in sync with the
+ * add_wait_queue modifications to the wait queue.
+ *
+ * This memory barrier is paired in the sock_poll_wait.
+ */
+ smp_mb();
+ return wq && waitqueue_active(&wq->wait);
+}
+
+/**
+ * sock_poll_wait - place memory barrier behind the poll_wait call.
+ * @filp: file
+ * @wait_address: socket wait queue
+ * @p: poll_table
+ *
+ * See the comments in the wq_has_sleeper function.
+ */
+static inline void sock_poll_wait(struct file *filp,
+ wait_queue_head_t *wait_address, poll_table *p)
+{
+ if (!poll_does_not_wait(p) && wait_address) {
+ poll_wait(filp, wait_address, p);
+ /*
+ * We need to be sure we are in sync with the
+ * socket flags modification.
+ *
+ * This memory barrier is paired in the wq_has_sleeper.
+ */
+ smp_mb();
+ }
+}
+
+/*
+ * 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)
+{
+ skb_orphan(skb);
+ skb->sk = sk;
+ skb->destructor = sock_wfree;
+ /*
+ * We used to take a refcount on sk, but following operation
+ * is enough to guarantee sk_free() wont free this sock until
+ * all in-flight packets are completed
+ */
+ atomic_add(skb->truesize, &sk->sk_wmem_alloc);
+}
+
+static inline void skb_set_owner_r(struct sk_buff *skb, struct sock *sk)
+{
+ skb_orphan(skb);
+ 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);
+
+extern int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb);
+
+/*
+ * 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 (sock_flag(sk, SOCK_FASYNC))
+ sock_wake_async(sk->sk_socket, how, band);
+}
+
+#define SOCK_MIN_SNDBUF 2048
+/*
+ * Since sk_rmem_alloc sums skb->truesize, even a small frame might need
+ * sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak
+ */
+#define SOCK_MIN_RCVBUF (2048 + sizeof(struct sk_buff))
+
+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_enter_memory_pressure(sk);
+ sk_stream_moderate_sndbuf(sk);
+ }
+ netslab_inc(SOCK_ALLOC_PAGES);
+ 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);
+extern void __sock_recv_wifi_status(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;
+ struct skb_shared_hwtstamps *hwtstamps = skb_hwtstamps(skb);
+
+ /*
+ * generate control messages if
+ * - receive time stamping in software requested (SOCK_RCVTSTAMP
+ * or SOCK_TIMESTAMPING_RX_SOFTWARE)
+ * - software time stamp available and wanted
+ * (SOCK_TIMESTAMPING_SOFTWARE)
+ * - hardware time stamps available and wanted
+ * (SOCK_TIMESTAMPING_SYS_HARDWARE or
+ * SOCK_TIMESTAMPING_RAW_HARDWARE)
+ */
+ if (sock_flag(sk, SOCK_RCVTSTAMP) ||
+ sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE) ||
+ (kt.tv64 && sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) ||
+ (hwtstamps->hwtstamp.tv64 &&
+ sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) ||
+ (hwtstamps->syststamp.tv64 &&
+ sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)))
+ __sock_recv_timestamp(msg, sk, skb);
+ else
+ sk->sk_stamp = kt;
+
+ if (sock_flag(sk, SOCK_WIFI_STATUS) && skb->wifi_acked_valid)
+ __sock_recv_wifi_status(msg, sk, skb);
+}
+
+extern void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
+ struct sk_buff *skb);
+
+static inline void sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
+ struct sk_buff *skb)
+{
+#define FLAGS_TS_OR_DROPS ((1UL << SOCK_RXQ_OVFL) | \
+ (1UL << SOCK_RCVTSTAMP) | \
+ (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
+ (1UL << SOCK_TIMESTAMPING_SOFTWARE) | \
+ (1UL << SOCK_TIMESTAMPING_RAW_HARDWARE) | \
+ (1UL << SOCK_TIMESTAMPING_SYS_HARDWARE))
+
+ if (sk->sk_flags & FLAGS_TS_OR_DROPS)
+ __sock_recv_ts_and_drops(msg, sk, skb);
+ else
+ sk->sk_stamp = skb->tstamp;
+}
+
+/**
+ * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped
+ * @sk: socket sending this packet
+ * @tx_flags: filled with instructions for time stamping
+ *
+ * Currently only depends on SOCK_TIMESTAMPING* flags. Returns error code if
+ * parameters are invalid.
+ */
+extern int sock_tx_timestamp(struct sock *sk, __u8 *tx_flags);
+
+/**
+ * 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)
+{
+ return read_pnet(&sk->sk_net);
+}
+
+static inline
+void sock_net_set(struct sock *sk, struct net *net)
+{
+ write_pnet(&sk->sk_net, net);
+}
+
+/*
+ * Kernel sockets, f.e. rtnl or icmp_socket, are a part of a namespace.
+ * They should not hold a reference 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, int flag);
+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 */