cregit-Linux how code gets into the kernel

Release 4.12 include/net/sock.h

Directory: include/net
/*
 * 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/bitops.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/page_counter.h>
#include <linux/memcontrol.h>
#include <linux/static_key.h>
#include <linux/sched.h>
#include <linux/wait.h>
#include <linux/cgroup-defs.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/tcp_states.h>
#include <linux/net_tstamp.h>
#include <net/smc.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 inline __printf(2, 3)

void SOCK_DEBUG(const 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;


typedef __u32 __bitwise __portpair;

typedef __u64 __bitwise __addrpair;

/**
 *      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_dport: placeholder for inet_dport/tw_dport
 *      @skc_num: placeholder for inet_num/tw_num
 *      @skc_family: network address family
 *      @skc_state: Connection state
 *      @skc_reuse: %SO_REUSEADDR setting
 *      @skc_reuseport: %SO_REUSEPORT 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_flags: place holder for sk_flags
 *              %SO_LINGER (l_onoff), %SO_BROADCAST, %SO_KEEPALIVE,
 *              %SO_OOBINLINE settings, %SO_TIMESTAMPING settings
 *      @skc_incoming_cpu: record/match cpu processing incoming packets
 *      @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 on a 8 bytes aligned
         * address on 64bit arches : cf INET_MATCH()
         */
	union {
		
__addrpair	skc_addrpair;
		struct {
			
__be32	skc_daddr;
			
__be32	skc_rcv_saddr;
		};
	};
	union  {
		
unsigned int	skc_hash;
		
__u16		skc_u16hashes[2];
	};
	/* skc_dport && skc_num must be grouped as well */
	union {
		
__portpair	skc_portpair;
		struct {
			
__be16	skc_dport;
			
__u16	skc_num;
		};
	};

	
unsigned short		skc_family;
	
volatile unsigned char	skc_state;
	
unsigned char		skc_reuse:4;
	
unsigned char		skc_reuseport:1;
	
unsigned char		skc_ipv6only:1;
	
unsigned char		skc_net_refcnt:1;
	
int			skc_bound_dev_if;
	union {
		
struct hlist_node	skc_bind_node;
		
struct hlist_node	skc_portaddr_node;
	};
	
struct proto		*skc_prot;
	
possible_net_t		skc_net;

#if IS_ENABLED(CONFIG_IPV6)
	
struct in6_addr		skc_v6_daddr;
	
struct in6_addr		skc_v6_rcv_saddr;
#endif

	
atomic64_t		skc_cookie;

	/* following fields are padding to force
         * offset(struct sock, sk_refcnt) == 128 on 64bit arches
         * assuming IPV6 is enabled. We use this padding differently
         * for different kind of 'sockets'
         */
	union {
		
unsigned long	skc_flags;
		
struct sock	*skc_listener; /* request_sock */
		
struct inet_timewait_death_row *skc_tw_dr; /* inet_timewait_sock */
	};
	/*
         * 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;
	union {
		
int		skc_incoming_cpu;
		
u32		skc_rcv_wnd;
		
u32		skc_tw_rcv_nxt; /* struct tcp_timewait_sock  */
	};

	
atomic_t		skc_refcnt;
	/* private: */
	
int                     skc_dontcopy_end[0];
	union {
		
u32		skc_rxhash;
		
u32		skc_window_clamp;
		
u32		skc_tw_snd_nxt; /* struct tcp_timewait_sock */
	};
	/* public: */
};

/**
  *     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_kern_sock: True if sock is using kernel lock classes
  *     @sk_rcvbuf: size of receive buffer in bytes
  *     @sk_wq: sock wait queue and async head
  *     @sk_rx_dst: receive input route used by early demux
  *     @sk_dst_cache: destination cache
  *     @sk_dst_pending_confirm: need to confirm neighbour
  *     @sk_policy: flow policy
  *     @sk_receive_queue: incoming packets
  *     @sk_wmem_alloc: transmit queue bytes committed
  *     @sk_write_queue: Packet sending queue
  *     @sk_omem_alloc: "o" is "option" or "other"
  *     @sk_wmem_queued: persistent queue size
  *     @sk_forward_alloc: space allocated forward
  *     @sk_napi_id: id of the last napi context to receive data for sk
  *     @sk_ll_usec: usecs to busypoll when there is no data
  *     @sk_allocation: allocation mode
  *     @sk_pacing_rate: Pacing rate (if supported by transport/packet scheduler)
  *     @sk_max_pacing_rate: Maximum pacing rate (%SO_MAX_PACING_RATE)
  *     @sk_sndbuf: size of send buffer in bytes
  *     @sk_padding: unused element for alignment
  *     @sk_no_check_tx: %SO_NO_CHECK setting, set checksum in TX packets
  *     @sk_no_check_rx: allow zero checksum in RX 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_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_txhash: computed flow hash for use on transmit
  *     @sk_filter: socket filtering instructions
  *     @sk_timer: sock cleanup timer
  *     @sk_stamp: time stamp of last packet received
  *     @sk_tsflags: SO_TIMESTAMPING socket options
  *     @sk_tskey: counter to disambiguate concurrent tstamp requests
  *     @sk_socket: Identd and reporting IO signals
  *     @sk_user_data: RPC layer private data
  *     @sk_frag: cached page frag
  *     @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_cgrp_data: cgroup data for this cgroup
  *     @sk_memcg: this socket's memory cgroup association
  *     @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
  *     @sk_reuseport_cb: reuseport group container
  *     @sk_rcu: used during RCU grace period
  */

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_portpair		__sk_common.skc_portpair

#define sk_num			__sk_common.skc_num

#define sk_dport		__sk_common.skc_dport

#define sk_addrpair		__sk_common.skc_addrpair

#define sk_daddr		__sk_common.skc_daddr

#define sk_rcv_saddr		__sk_common.skc_rcv_saddr

#define sk_family		__sk_common.skc_family

#define sk_state		__sk_common.skc_state

#define sk_reuse		__sk_common.skc_reuse

#define sk_reuseport		__sk_common.skc_reuseport

#define sk_ipv6only		__sk_common.skc_ipv6only

#define sk_net_refcnt		__sk_common.skc_net_refcnt

#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

#define sk_v6_daddr		__sk_common.skc_v6_daddr

#define sk_v6_rcv_saddr	__sk_common.skc_v6_rcv_saddr

#define sk_cookie		__sk_common.skc_cookie

#define sk_incoming_cpu		__sk_common.skc_incoming_cpu

#define sk_flags		__sk_common.skc_flags

#define sk_rxhash		__sk_common.skc_rxhash

	
socket_lock_t		sk_lock;
	
atomic_t		sk_drops;
	
int			sk_rcvlowat;
	
struct sk_buff_head	sk_error_queue;
	
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_NET_RX_BUSY_POLL
	
unsigned int		sk_ll_usec;
	/* ===== mostly read cache line ===== */
	
unsigned int		sk_napi_id;
#endif
	
int			sk_rcvbuf;

	
struct sk_filter __rcu	*sk_filter;
	union {
		
struct socket_wq __rcu	*sk_wq;
		
struct socket_wq	*sk_wq_raw;
	};
#ifdef CONFIG_XFRM
	
struct xfrm_policy __rcu *sk_policy[2];
#endif
	
struct dst_entry	*sk_rx_dst;
	
struct dst_entry __rcu	*sk_dst_cache;
	
atomic_t		sk_omem_alloc;
	
int			sk_sndbuf;

	/* ===== cache line for TX ===== */
	
int			sk_wmem_queued;
	
atomic_t		sk_wmem_alloc;
	
unsigned long		sk_tsq_flags;
	
struct sk_buff		*sk_send_head;
	
struct sk_buff_head	sk_write_queue;
	
__s32			sk_peek_off;
	
int			sk_write_pending;
	
__u32			sk_dst_pending_confirm;
	/* Note: 32bit hole on 64bit arches */
	
long			sk_sndtimeo;
	
struct timer_list	sk_timer;
	
__u32			sk_priority;
	
__u32			sk_mark;
	
u32			sk_pacing_rate; /* bytes per second */
	
u32			sk_max_pacing_rate;
	
struct page_frag	sk_frag;
	
netdev_features_t	sk_route_caps;
	
netdev_features_t	sk_route_nocaps;
	
int			sk_gso_type;
	
unsigned int		sk_gso_max_size;
	
gfp_t			sk_allocation;
	
__u32			sk_txhash;

	/*
         * Because of non atomicity rules, all
         * changes are protected by socket lock.
         */
	
unsigned int		__sk_flags_offset[0];
#ifdef __BIG_ENDIAN_BITFIELD

#define SK_FL_PROTO_SHIFT  16

#define SK_FL_PROTO_MASK   0x00ff0000


#define SK_FL_TYPE_SHIFT   0

#define SK_FL_TYPE_MASK    0x0000ffff
#else

#define SK_FL_PROTO_SHIFT  8

#define SK_FL_PROTO_MASK   0x0000ff00


#define SK_FL_TYPE_SHIFT   16

#define SK_FL_TYPE_MASK    0xffff0000
#endif

	kmemcheck_bitfield_begin(flags);
	
unsigned int		sk_padding : 1,
				
sk_kern_sock : 1,
				
sk_no_check_tx : 1,
				
sk_no_check_rx : 1,
				
sk_userlocks : 4,
				
sk_protocol  : 8,
				
sk_type      : 16;

#define SK_PROTOCOL_MAX U8_MAX
	kmemcheck_bitfield_end(flags);

	
u16			sk_gso_max_segs;
	
unsigned long	        sk_lingertime;
	
struct proto		*sk_prot_creator;
	
rwlock_t		sk_callback_lock;
	
int			sk_err,
				
sk_err_soft;
	
u32			sk_ack_backlog;
	
u32			sk_max_ack_backlog;
	
kuid_t			sk_uid;
	
struct pid		*sk_peer_pid;
	
const struct cred	*sk_peer_cred;
	
long			sk_rcvtimeo;
	
ktime_t			sk_stamp;
	
u16			sk_tsflags;
	
u8			sk_shutdown;
	
u32			sk_tskey;
	
struct socket		*sk_socket;
	
void			*sk_user_data;
#ifdef CONFIG_SECURITY
	
void			*sk_security;
#endif
	
struct sock_cgroup_data	sk_cgrp_data;
	
struct mem_cgroup	*sk_memcg;
	
void			(*sk_state_change)(struct sock *sk);
	
void			(*sk_data_ready)(struct sock *sk);
	
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);
	
struct sock_reuseport __rcu	*sk_reuseport_cb;
	
struct rcu_head		sk_rcu;
};


#define __sk_user_data(sk) ((*((void __rcu **)&(sk)->sk_user_data)))


#define rcu_dereference_sk_user_data(sk)	rcu_dereference(__sk_user_data((sk)))

#define rcu_assign_sk_user_data(sk, ptr)	rcu_assign_pointer(__sk_user_data((sk)), ptr)

/*
 * SK_CAN_REUSE and SK_NO_REUSE on a socket mean that the socket is OK
 * or not whether his port will be reused by someone else. SK_FORCE_REUSE
 * on a socket means that the socket will reuse everybody else's port
 * without looking at the other's sk_reuse value.
 */


#define SK_NO_REUSE	0

#define SK_CAN_REUSE	1

#define SK_FORCE_REUSE	2

int sk_set_peek_off(struct sock *sk, int val);




static inline int sk_peek_offset(struct sock *sk, int flags)
{
	if (unlikely(flags & MSG_PEEK)) {
		s32 off = READ_ONCE(sk->sk_peek_off);
		if (off >= 0)
			return off;
	}

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Pavel Emelyanov3164.58%150.00%


Willem de Bruijn1735.42%150.00%


Total48100.00%2100.00%






static inline void sk_peek_offset_bwd(struct sock *sk, int val)
{
	s32 off = READ_ONCE(sk->sk_peek_off);

	if (unlikely(off >= 0)) {
		off = max_t(s32, off - val, 0);
		WRITE_ONCE(sk->sk_peek_off, off);
	}
}


Contributors
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Willem de Bruijn2950.00%150.00%


Pavel Emelyanov2950.00%150.00%


Total58100.00%2100.00%






static inline void sk_peek_offset_fwd(struct sock *sk, int val)
{
	sk_peek_offset_bwd(sk, -val);
}


Contributors
PersonTokensPropCommitsCommitProp
Pavel Emelyanov1878.26%150.00%


Willem de Bruijn521.74%150.00%


Total23100.00%2100.00%



/*
 * Hashed lists helper routines
 */



static inline struct sock *sk_entry(const struct hlist_node *node)
{
	return hlist_entry(node, struct sock, sk_node);
}


Contributors
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Li Zefan26100.00%1100.00%


Total26100.00%1100.00%






static inline struct sock *__sk_head(const struct hlist_head *head)
{
	return hlist_entry(head->first, struct sock, sk_node);
}


Contributors
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Arnaldo Carvalho de Melo28100.00%2100.00%


Total28100.00%2100.00%






static inline struct sock *sk_head(const struct hlist_head *head)
{
	return hlist_empty(head) ? NULL : __sk_head(head);
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo28100.00%2100.00%


Total28100.00%2100.00%






static inline struct sock *__sk_nulls_head(const struct hlist_nulls_head *head)
{
	return hlist_nulls_entry(head->first, struct sock, sk_nulls_node);
}


Contributors
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Eric Dumazet28100.00%1100.00%


Total28100.00%1100.00%






static inline struct sock *sk_nulls_head(const struct hlist_nulls_head *head)
{
	return hlist_nulls_empty(head) ? NULL : __sk_nulls_head(head);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet28100.00%1100.00%


Total28100.00%1100.00%






static inline struct sock *sk_next(const struct sock *sk)
{
	return hlist_entry_safe(sk->sk_node.next, struct sock, sk_node);
}


Contributors
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Arnaldo Carvalho de Melo2996.67%266.67%


Geliang Tang13.33%133.33%


Total30100.00%3100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet44100.00%1100.00%


Total44100.00%1100.00%






static inline bool sk_unhashed(const struct sock *sk)
{
	return hlist_unhashed(&sk->sk_node);
}


Contributors
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Arnaldo Carvalho de Melo2195.45%266.67%


Eric Dumazet14.55%133.33%


Total22100.00%3100.00%






static inline bool sk_hashed(const struct sock *sk)
{
	return !sk_unhashed(sk);
}


Contributors
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Arnaldo Carvalho de Melo1575.00%250.00%


Akinobu Mita420.00%125.00%


Eric Dumazet15.00%125.00%


Total20100.00%4100.00%






static inline void sk_node_init(struct hlist_node *node)
{
	node->pprev = NULL;
}


Contributors
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Arnaldo Carvalho de Melo1794.44%150.00%


Eric Dumazet15.56%150.00%


Total18100.00%2100.00%






static inline void sk_nulls_node_init(struct hlist_nulls_node *node)
{
	node->pprev = NULL;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet18100.00%2100.00%


Total18100.00%2100.00%






static inline void __sk_del_node(struct sock *sk)
{
	__hlist_del(&sk->sk_node);
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo1995.00%150.00%


Eric Dumazet15.00%150.00%


Total20100.00%2100.00%



/* NB: equivalent to hlist_del_init_rcu */



static inline bool __sk_del_node_init(struct sock *sk)
{
	if (sk_hashed(sk)) {
		__sk_del_node(sk);
		sk_node_init(&sk->sk_node);
		return true;
	}
	return false;
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo3690.00%266.67%


Eric Dumazet410.00%133.33%


Total40100.00%3100.00%



/* 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 __always_inline void sock_hold(struct sock *sk)
{
	atomic_inc(&sk->sk_refcnt);
}


Contributors
PersonTokensPropCommitsCommitProp
Andrew Morton1995.00%150.00%


Denys Vlasenko15.00%150.00%


Total20100.00%2100.00%



/* Ungrab socket in the context, which assumes that socket refcnt
   cannot hit zero, f.e. it is true in context of any socketcall.
 */



static __always_inline void __sock_put(struct sock *sk)
{
	atomic_dec(&sk->sk_refcnt);
}


Contributors
PersonTokensPropCommitsCommitProp
Andrew Morton1050.00%133.33%


Arnaldo Carvalho de Melo945.00%133.33%


Denys Vlasenko15.00%133.33%


Total20100.00%3100.00%






static inline bool sk_del_node_init(struct sock *sk)
{
	bool 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;
}

Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo4593.75%150.00%


Eric Dumazet36.25%150.00%


Total48100.00%2100.00%




#define sk_del_node_init_rcu(sk)	sk_del_node_init(sk)




static inline bool __sk_nulls_del_node_init_rcu(struct sock *sk)
{
	if (sk_hashed(sk)) {
		hlist_nulls_del_init_rcu(&sk->sk_nulls_node);
		return true;
	}
	return false;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet35100.00%3100.00%


Total35100.00%3100.00%






static inline bool sk_nulls_del_node_init_rcu(struct sock *sk)
{
	bool 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet48100.00%3100.00%


Total48100.00%3100.00%






static inline void __sk_add_node(struct sock *sk, struct hlist_head *list)
{
	hlist_add_head(&sk->sk_node, list);
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo2696.30%266.67%


Eric Dumazet13.70%133.33%


Total27100.00%3100.00%






static inline void sk_add_node(struct sock *sk, struct hlist_head *list)
{
	sock_hold(sk);
	__sk_add_node(sk, list);
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo2896.55%150.00%


Eric Dumazet13.45%150.00%


Total29100.00%2100.00%






static inline void sk_add_node_rcu(struct sock *sk, struct hlist_head *list)
{
	sock_hold(sk);
	if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
	    sk->sk_family == AF_INET6)
		hlist_add_tail_rcu(&sk->sk_node, list);
	else
		hlist_add_head_rcu(&sk->sk_node, list);
}


Contributors
PersonTokensPropCommitsCommitProp
Stephen Hemminger3151.67%133.33%


Craig Gallek2846.67%133.33%


Eric Dumazet11.67%133.33%


Total60100.00%3100.00%






static inline void __sk_nulls_add_node_rcu(struct sock *sk, struct hlist_nulls_head *list)
{
	if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
	    sk->sk_family == AF_INET6)
		hlist_nulls_add_tail_rcu(&sk->sk_nulls_node, list);
	else
		hlist_nulls_add_head_rcu(&sk->sk_nulls_node, list);
}


Contributors
PersonTokensPropCommitsCommitProp
Craig Gallek2850.91%125.00%


Eric Dumazet2749.09%375.00%


Total55100.00%4100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet29100.00%3100.00%


Total29100.00%3100.00%






static inline void __sk_del_bind_node(struct sock *sk)
{
	__hlist_del(&sk->sk_bind_node);
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo1995.00%150.00%


Eric Dumazet15.00%150.00%


Total20100.00%2100.00%






static inline void sk_add_bind_node(struct sock *sk,
					struct hlist_head *list)
{
	hlist_add_head(&sk->sk_bind_node, list);
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo2696.30%150.00%


Eric Dumazet13.70%150.00%


Total27100.00%2100.00%




#define sk_for_each(__sk, list) \
	hlist_for_each_entry(__sk, list, sk_node)

#define sk_for_each_rcu(__sk, list) \
	hlist_for_each_entry_rcu(__sk, 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) \
	hlist_for_each_entry_from(__sk, 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, tmp, list) \
	hlist_for_each_entry_safe(__sk, tmp, list, sk_node)

#define sk_for_each_bound(__sk, list) \
	hlist_for_each_entry(__sk, list, sk_bind_node)

/**
 * sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset
 * @tpos:       the type * to use as a loop cursor.
 * @pos:        the &struct hlist_node to use as a loop cursor.
 * @head:       the head for your list.
 * @offset:     offset of hlist_node within the struct.
 *
 */

#define sk_for_each_entry_offset_rcu(tpos, pos, head, offset)		       \
	for (pos = rcu_dereference((head)->first);                             \
             pos != NULL &&                                                    \
                ({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;});       \
             pos = rcu_dereference(pos->next))




static inline struct user_namespace *sk_user_ns(struct sock *sk)
{
	/* Careful only use this in a context where these parameters
         * can not change and must all be valid, such as recvmsg from
         * userspace.
         */
	return sk->sk_socket->file->f_cred->user_ns;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric W. Biedermann26100.00%1100.00%


Total26100.00%1100.00%



/* 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_MEMALLOC, /* VM depends on this socket for swapping */
	
SOCK_TIMESTAMPING_RX_SOFTWARE,  /* %SOF_TIMESTAMPING_RX_SOFTWARE */
	
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.
                     */
	
SOCK_FILTER_LOCKED, /* Filter cannot be changed anymore */
	
SOCK_SELECT_ERR_QUEUE, /* Wake select on error queue */
	
SOCK_RCU_FREE, /* wait rcu grace period in sk_destruct() */
};


#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE))




static inline void sock_copy_flags(struct sock *nsk, struct sock *osk)
{
	nsk->sk_flags = osk->sk_flags;
}


Contributors
PersonTokensPropCommitsCommitProp
Ralf Bächle25100.00%1100.00%


Total25100.00%1100.00%






static inline void sock_set_flag(struct sock *sk, enum sock_flags flag)
{
	__set_bit(flag, &sk->sk_flags);
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo26100.00%2100.00%


Total26100.00%2100.00%






static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag)
{
	__clear_bit(flag, &sk->sk_flags);
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo26100.00%2100.00%


Total26100.00%2100.00%






static inline bool sock_flag(const struct sock *sk, enum sock_flags flag)
{
	return test_bit(flag, &sk->sk_flags);
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo2692.86%266.67%


Eric Dumazet27.14%133.33%


Total28100.00%3100.00%



#ifdef CONFIG_NET
extern struct static_key memalloc_socks;



static inline int sk_memalloc_socks(void)
{
	return static_key_false(&memalloc_socks);
}

Contributors
PersonTokensPropCommitsCommitProp
Mel Gorman16100.00%1100.00%


Total16100.00%1100.00%



#else




static inline int sk_memalloc_socks(void)
{
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Mel Gorman12100.00%1100.00%


Total12100.00%1100.00%



#endif




static inline gfp_t sk_gfp_mask(const struct sock *sk, gfp_t gfp_mask)
{
	return gfp_mask | (sk->sk_allocation & __GFP_MEMALLOC);
}


Contributors
PersonTokensPropCommitsCommitProp
Mel Gorman2488.89%250.00%


Eric Dumazet311.11%250.00%


Total27100.00%4100.00%






static inline void sk_acceptq_removed(struct sock *sk)
{
	sk->sk_ack_backlog--;
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo17100.00%1100.00%


Total17100.00%1100.00%






static inline void sk_acceptq_added(struct sock *sk)
{
	sk->sk_ack_backlog++;
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo17100.00%1100.00%


Total17100.00%1100.00%






static inline bool sk_acceptq_is_full(const struct sock *sk)
{
	return sk->sk_ack_backlog > sk->sk_max_ack_backlog;
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo1986.36%133.33%


Eric Dumazet29.09%133.33%


David S. Miller14.55%133.33%


Total22100.00%3100.00%



/*
 * Compute minimal free write space needed to queue new packets.
 */



static inline int sk_stream_min_wspace(const struct sock *sk)
{
	return sk->sk_wmem_queued >> 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo1785.00%133.33%


Eric Dumazet315.00%266.67%


Total20100.00%3100.00%






static inline int sk_stream_wspace(const struct sock *sk)
{
	return sk->sk_sndbuf - sk->sk_wmem_queued;
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo2195.45%150.00%


Eric Dumazet14.55%150.00%


Total22100.00%2100.00%



void sk_stream_write_space(struct sock *sk);

/* 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_safe(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;
}


Contributors
PersonTokensPropCommitsCommitProp
Stephen Hemminger5584.62%120.00%


Eric Dumazet69.23%240.00%


Linus Torvalds (pre-git)34.62%120.00%


Yi Zhu11.54%120.00%


Total65100.00%5100.00%



/*
 * 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, unsigned int limit)
{
	unsigned int qsize = sk->sk_backlog.len + atomic_read(&sk->sk_rmem_alloc);

	return qsize > limit;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet2255.00%266.67%


Yi Zhu1845.00%133.33%


Total40100.00%3100.00%



/* The per-socket spinlock must be held here. */



static inline __must_check int sk_add_backlog(struct sock *sk, struct sk_buff *skb,
					      unsigned int limit)
{
	if (sk_rcvqueues_full(sk, limit))
		return -ENOBUFS;

	/*
         * If the skb was allocated from pfmemalloc reserves, only
         * allow SOCK_MEMALLOC sockets to use it as this socket is
         * helping free memory
         */
	if (skb_pfmemalloc(skb) && !sock_flag(sk, SOCK_MEMALLOC))
		return -ENOMEM;

	__sk_add_backlog(sk, skb);
	sk->sk_backlog.len += skb->truesize;
	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet4864.00%360.00%


Yi Zhu2736.00%240.00%


Total75100.00%5100.00%



int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb);




static inline int sk_backlog_rcv(struct sock *sk, struct sk_buff *skb)
{
	if (sk_memalloc_socks() && skb_pfmemalloc(skb))
		return __sk_backlog_rcv(sk, skb);

	return sk->sk_backlog_rcv(sk, skb);
}


Contributors
PersonTokensPropCommitsCommitProp
Peter Zijlstra2760.00%150.00%


Mel Gorman1840.00%150.00%


Total45100.00%2100.00%






static inline void sk_incoming_cpu_update(struct sock *sk)
{
	sk->sk_incoming_cpu = raw_smp_processor_id();
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet19100.00%1100.00%


Total19100.00%1100.00%






static inline void sock_rps_record_flow_hash(__u32 hash)
{
#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, hash);
	rcu_read_unlock();
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller3690.00%150.00%


Tom Herbert410.00%150.00%


Total40100.00%2100.00%






static inline void sock_rps_record_flow(const struct sock *sk)
{
#ifdef CONFIG_RPS
	if (static_key_false(&rfs_needed)) {
		/* Reading sk->sk_rxhash might incur an expensive cache line
                 * miss.
                 *
                 * TCP_ESTABLISHED does cover almost all states where RFS
                 * might be useful, and is cheaper [1] than testing :
                 *      IPv4: inet_sk(sk)->inet_daddr
                 *      IPv6: ipv6_addr_any(&sk->sk_v6_daddr)
                 * OR   an additional socket flag
                 * [1] : sk_state and sk_prot are in the same cache line.
                 */
		if (sk->sk_state == TCP_ESTABLISHED)
			sock_rps_record_flow_hash(sk->sk_rxhash);
	}
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
Tom Herbert2045.45%125.00%


Eric Dumazet1943.18%250.00%


Zhi Yong Wu511.36%125.00%


Total44100.00%4100.00%






static inline void sock_rps_save_rxhash(struct sock *sk,
					const struct sk_buff *skb)
{
#ifdef CONFIG_RPS
	if (unlikely(sk->sk_rxhash != skb->hash))
		sk->sk_rxhash = skb->hash;
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller3375.00%133.33%


Tom Herbert1125.00%266.67%


Total44100.00%3100.00%






static inline void sock_rps_reset_rxhash(struct sock *sk)
{
#ifdef CONFIG_RPS
	sk->sk_rxhash = 0;
#endif
}


Contributors
PersonTokensPropCommitsCommitProp
Tom Herbert23100.00%1100.00%


Total23100.00%1100.00%




#define sk_wait_event(__sk, __timeo, __condition, __wait)		\
	({      int __rc;                                               \
                release_sock(__sk);                                     \
                __rc = __condition;                                     \
                if (!__rc) {                                            \
                        *(__timeo) = wait_woken(__wait,                 \
                                                TASK_INTERRUPTIBLE,     \
                                                *(__timeo));            \
                }                                                       \
                sched_annotate_sleep();                                 \
                lock_sock(__sk);                                        \
                __rc = __condition;                                     \
                __rc;                                                   \
        })

int sk_stream_wait_connect(struct sock *sk, long *timeo_p);
int sk_stream_wait_memory(struct sock *sk, long *timeo_p);
void sk_stream_wait_close(struct sock *sk, long timeo_p);
int sk_stream_error(struct sock *sk, int flags, int err);
void sk_stream_kill_queues(struct sock *sk);
void sk_set_memalloc(struct sock *sk);
void sk_clear_memalloc(struct sock *sk);

void __sk_flush_backlog(struct sock *sk);




static inline bool sk_flush_backlog(struct sock *sk)
{
	if (unlikely(READ_ONCE(sk->sk_backlog.tail))) {
		__sk_flush_backlog(sk);
		return true;
	}
	return false;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet39100.00%1100.00%


Total39100.00%1100.00%



int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb);

struct request_sock_ops;
struct timewait_sock_ops;
struct inet_hashinfo;
struct raw_hashinfo;
struct smc_hashinfo;
struct module;

/*
 * caches using SLAB_TYPESAFE_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));
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet70100.00%1100.00%


Total70100.00%1100.00%



/* Networking protocol blocks we attach to sockets.
 * socket layer -> transport layer interface
 */

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,
					  bool kern);

	
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);
	
void			(*keepalive)(struct sock *sk, int valbool);
#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 sock *sk, struct msghdr *msg,
					   size_t len);
	
int			(*recvmsg)(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);

	
void		(*release_cb)(struct sock *sk);

	/* Keeping track of sk's, looking them up, and port selection methods. */
	
int			(*hash)(struct sock *sk);
	
void			(*unhash)(struct sock *sk);
	
void			(*rehash)(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

	
bool			(*stream_memory_free)(const struct sock *sk);
	/* 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;
		
struct smc_hashinfo	*smc_hash;
	
} h;

	
struct module		*owner;

	
char			name[32];

	
struct list_head	node;
#ifdef SOCK_REFCNT_DEBUG
	
atomic_t		socks;
#endif
	
int			(*diag_destroy)(struct sock *sk, int err);
};

int proto_register(struct proto *prot, int alloc_slab);
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);
}


Contributors
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Arnaldo Carvalho de Melo22100.00%1100.00%


Total22100.00%1100.00%






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));
}


Contributors
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Arnaldo Carvalho de Melo46100.00%1100.00%


Total46100.00%1100.00%






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));
}

Contributors
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Arnaldo Carvalho de Melo4697.87%150.00%


Ying Xue12.13%150.00%


Total47100.00%2100.00%



#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 */




static inline bool sk_stream_memory_free(const struct sock *sk)
{
	if (sk->sk_wmem_queued >= sk->sk_sndbuf)
		return false;

	return sk->sk_prot->stream_memory_free ?
		sk->sk_prot->stream_memory_free(sk) : true;
}


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Eric Dumazet44100.00%1100.00%


Total44100.00%1100.00%






static inline bool sk_stream_is_writeable(const struct sock *sk)
{
	return sk_stream_wspace(sk) >= sk_stream_min_wspace(sk) &&
	       sk_stream_memory_free(sk);
}


Contributors
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Eric Dumazet29100.00%2100.00%


Total29100.00%2100.00%






static inline int sk_under_cgroup_hierarchy(struct sock *sk,
					    struct cgroup *ancestor)
{
#ifdef CONFIG_SOCK_CGROUP_DATA
	return cgroup_is_descendant(sock_cgroup_ptr(&sk->sk_cgrp_data),
				    ancestor);
#else
	return -ENOTSUPP;
#endif
}


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Daniel Borkmann42100.00%1100.00%


Total42100.00%1100.00%






static inline bool sk_has_memory_pressure(const struct sock *sk)
{
	return sk->sk_prot->memory_pressure != NULL;
}


Contributors
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Glauber de Oliveira Costa22100.00%1100.00%


Total22100.00%1100.00%






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_memcg &&
	    mem_cgroup_under_socket_pressure(sk->sk_memcg))
		return true;

	return !!*sk->sk_prot->memory_pressure;
}


Contributors
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Glauber de Oliveira Costa4381.13%240.00%


Johannes Weiner916.98%240.00%


Christoph Paasch11.89%120.00%


Total53100.00%5100.00%






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;
}


Contributors
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Glauber de Oliveira Costa38100.00%2100.00%


Total38100.00%2100.00%






static inline void sk_enter_memory_pressure(struct sock *sk)
{
	if (!sk->sk_prot->enter_memory_pressure)
		return;

	sk->sk_prot->enter_memory_pressure(sk);
}


Contributors
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Glauber de Oliveira Costa31100.00%2100.00%


Total31100.00%2100.00%





static inline long

sk_memory_allocated(const struct sock *sk)
{
	return atomic_long_read(sk->sk_prot->memory_allocated);
}


Contributors
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Glauber de Oliveira Costa2191.30%266.67%


Johannes Weiner28.70%133.33%


Total23100.00%3100.00%





static inline long

sk_memory_allocated_add(struct sock *sk, int amt)
{
	return atomic_long_add_return(amt, sk->sk_prot->memory_allocated);
}


Contributors
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Glauber de Oliveira Costa2592.59%266.67%


Johannes Weiner27.41%133.33%


Total27100.00%3100.00%





static inline void

sk_memory_allocated_sub(struct sock *sk, int amt)
{
	atomic_long_sub(amt, sk->sk_prot->memory_allocated);
}


Contributors
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Glauber de Oliveira Costa2388.46%150.00%


Johannes Weiner311.54%150.00%


Total26100.00%2100.00%






static inline void sk_sockets_allocated_dec(struct sock *sk)
{
	percpu_counter_dec(sk->sk_prot->sockets_allocated);
}


Contributors
PersonTokensPropCommitsCommitProp
Glauber de Oliveira Costa1990.48%266.67%


Johannes Weiner29.52%133.33%


Total21100.00%3100.00%






static inline void sk_sockets_allocated_inc(struct sock *sk)
{
	percpu_counter_inc(sk->sk_prot->sockets_allocated);
}


Contributors
PersonTokensPropCommitsCommitProp
Glauber de Oliveira Costa1990.48%266.67%


Johannes Weiner29.52%133.33%


Total21100.00%3100.00%





static inline int

sk_sockets_allocated_read_positive(struct sock *sk)
{
	return percpu_counter_read_positive(sk->sk_prot->sockets_allocated);
}


Contributors
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Glauber de Oliveira Costa2090.91%250.00%


Johannes Weiner14.55%125.00%


Eric Dumazet14.55%125.00%


Total22100.00%4100.00%





static inline int

proto_sockets_allocated_sum_positive(struct proto *prot)
{
	return percpu_counter_sum_positive(prot->sockets_allocated);
}


Contributors
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Glauber de Oliveira Costa20100.00%1100.00%


Total20100.00%1100.00%





static inline long

proto_memory_allocated(struct proto *prot)
{
	return atomic_long_read(prot->memory_allocated);
}


Contributors
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Glauber de Oliveira Costa20100.00%1100.00%


Total20100.00%1100.00%





static inline bool

proto_memory_pressure(struct proto *prot)
{
	if (!prot->memory_pressure)
		return false;
	return !!*prot->memory_pressure;
}



Contributors
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Glauber de Oliveira Costa30100.00%1100.00%


Total30100.00%1100.00%



#ifdef CONFIG_PROC_FS
/* Called with local bh disabled */
void sock_prot_inuse_add(struct net *net, struct proto *prot, int inc);
int sock_prot_inuse_get(struct net *net, struct proto *proto);
#else



static inline void sock_prot_inuse_add(struct net *net, struct proto *prot,
		int inc)
{
}

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Eric Dumazet1473.68%266.67%


Pavel Emelyanov526.32%133.33%


Total19100.00%3100.00%



#endif


/* With per-bucket locks this operation is not-atomic, so that
 * this version is not worse.
 */



static inline int __sk_prot_rehash(struct sock *sk)
{
	sk->sk_prot->unhash(sk);
	return sk->sk_prot->hash(sk);
}


Contributors
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Arnaldo Carvalho de Melo2890.32%150.00%


Craig Gallek39.68%150.00%


Total31100.00%2100.00%



/* 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


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;
}


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Christoph Hellwig28100.00%1100.00%


Total28100.00%1100.00%






static inline struct inode *SOCK_INODE(struct socket *socket)
{
	return &container_of(socket, struct socket_alloc, socket)->vfs_inode;
}


Contributors
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Christoph Hellwig28100.00%1100.00%


Total28100.00%1100.00%



/*
 * Functions for memory accounting
 */
int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind);
int __sk_mem_schedule(struct sock *sk, int size, int kind);
void __sk_mem_reduce_allocated(struct sock *sk, int amount);
void __sk_mem_reclaim(struct sock *sk, int amount);

/* We used to have PAGE_SIZE here, but systems with 64KB pages
 * do not necessarily have 16x time more memory than 4KB ones.
 */

#define SK_MEM_QUANTUM 4096

#define SK_MEM_QUANTUM_SHIFT ilog2(SK_MEM_QUANTUM)

#define SK_MEM_SEND	0

#define SK_MEM_RECV	1

/* sysctl_mem values are in pages, we convert them in SK_MEM_QUANTUM units */



static inline long sk_prot_mem_limits(const struct sock *sk, int index)
{
	long val = sk->sk_prot->sysctl_mem[index];

#if PAGE_SIZE > SK_MEM_QUANTUM
	val <<= PAGE_SHIFT - SK_MEM_QUANTUM_SHIFT;
#elif PAGE_SIZE < SK_MEM_QUANTUM
	val >>= SK_MEM_QUANTUM_SHIFT - PAGE_SHIFT;
#endif
	return val;
}


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Eric Dumazet55100.00%1100.00%


Total55100.00%1100.00%






static inline int sk_mem_pages(int amt)
{
	return (amt + SK_MEM_QUANTUM - 1) >> SK_MEM_QUANTUM_SHIFT;
}


Contributors
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Arnaldo Carvalho de Melo1257.14%133.33%


Eric Dumazet628.57%133.33%


Hideo Aoki314.29%133.33%


Total21100.00%3100.00%






static inline bool sk_has_account(struct sock *sk)
{
	/* return true if protocol supports memory accounting */
	return !!sk->sk_prot->memory_allocated;
}


Contributors
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Arnaldo Carvalho de Melo1254.55%133.33%


Hideo Aoki940.91%133.33%


Eric Dumazet14.55%133.33%


Total22100.00%3100.00%






static inline bool sk_wmem_schedule(struct sock *sk, int size)
{
	if (!sk_has_account(sk))
		return true;
	return size <= sk->sk_forward_alloc ||
		__sk_mem_schedule(sk, size, SK_MEM_SEND);
}


Contributors
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Arnaldo Carvalho de Melo2354.76%133.33%


Hideo Aoki1740.48%133.33%


Eric Dumazet24.76%133.33%


Total42100.00%3100.00%





static inline bool

sk_rmem_schedule(struct sock *sk, struct sk_buff *skb, int size)
{
	if (!sk_has_account(sk))
		return true;
	return size<= sk->sk_forward_alloc ||
		__sk_mem_schedule(sk, size, SK_MEM_RECV) ||
		skb_pfmemalloc(skb);
}


Contributors
PersonTokensPropCommitsCommitProp
Herbert Xu2751.92%125.00%


Hideo Aoki1325.00%125.00%


Mel Gorman1019.23%125.00%


Eric Dumazet23.85%125.00%


Total52100.00%4100.00%






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, sk->sk_forward_alloc);
}


Contributors
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Hideo Aoki3489.47%150.00%


Eric Dumazet410.53%150.00%


Total38100.00%2100.00%






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, sk->sk_forward_alloc - 1);
}


Contributors
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David S. Miller3485.00%150.00%


Eric Dumazet615.00%150.00%


Total40100.00%2100.00%






static inline void sk_mem_charge(struct sock *sk, int size)
{
	if (!sk_has_account(sk))
		return;
	sk->sk_forward_alloc -= size;
}


Contributors
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Hideo Aoki30100.00%1100.00%


Total30100.00%1100.00%






static inline void sk_mem_uncharge(struct sock *sk, int size)
{
	if (!sk_has_account(sk))
		return;
	sk->sk_forward_alloc += size;

	/* Avoid a possible overflow.
         * TCP send queues can make this happen, if sk_mem_reclaim()
         * is not called and more than 2 GBytes are released at once.
         *
         * If we reach 2 MBytes, reclaim 1 MBytes right now, there is
         * no need to hold that much forward allocation anyway.
         */
	if (unlikely(sk->sk_forward_alloc >= 1 << 21))
		__sk_mem_reclaim(sk, 1 << 20);
}


Contributors
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Hideo Aoki3056.60%150.00%


Eric Dumazet2343.40%150.00%


Total53100.00%2100.00%






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);
}


Contributors
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Hideo Aoki46100.00%1100.00%


Total46100.00%1100.00%






static inline void sock_release_ownership(struct sock *sk)
{
	if (sk->sk_lock.owned) {
		sk->sk_lock.owned = 0;

		/* The sk_lock has mutex_unlock() semantics: */
		mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_);
	}
}


Contributors
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Hannes Frederic Sowa2555.56%150.00%


Eric Dumazet2044.44%150.00%


Total45100.00%2100.00%



/*
 * 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)

#ifdef CONFIG_LOCKDEP



static inline bool lockdep_sock_is_held(const struct sock *csk)
{
	struct sock *sk = (struct sock *)csk;

	return lockdep_is_held(&sk->sk_lock) ||
	       lockdep_is_held(&sk->sk_lock.slock);
}

Contributors
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Hannes Frederic Sowa44100.00%2100.00%


Total44100.00%2100.00%



#endif

void lock_sock_nested(struct sock *sk, int subclass);




static inline void lock_sock(struct sock *sk)
{
	lock_sock_nested(sk, 0);
}


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Peter Zijlstra19100.00%1100.00%


Total19100.00%1100.00%



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))

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);
}


Contributors
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Eric Dumazet35100.00%2100.00%


Total35100.00%2100.00%



/* 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.
 */




static inline void sock_owned_by_me(const struct sock *sk)
{
#ifdef CONFIG_LOCKDEP
	WARN_ON_ONCE(!lockdep_sock_is_held(sk) && debug_locks);
#endif
}


Contributors
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Hannes Frederic Sowa2379.31%133.33%


Eric Dumazet620.69%266.67%


Total29100.00%3100.00%






static inline bool sock_owned_by_user(const struct sock *sk)
{
	sock_owned_by_me(sk);
	return sk->sk_lock.owned;
}


Contributors
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Eric Dumazet1768.00%150.00%


Hannes Frederic Sowa832.00%150.00%


Total25100.00%2100.00%



/* no reclassification while locks are held */



static inline bool sock_allow_reclassification(const struct sock *csk)
{
	struct sock *sk = (struct sock *)csk;

	return !sk->sk_lock.owned && !spin_is_locked(&sk->sk_lock.slock);
}


Contributors
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Hannes Frederic Sowa44100.00%1100.00%


Total44100.00%1100.00%



struct sock *sk_alloc(struct net *net, int family, gfp_t priority,
		      struct proto *prot, int kern);
void sk_free(struct sock *sk);
void sk_destruct(struct sock *sk);
struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority);
void sk_free_unlock_clone(struct sock *sk);

struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force,
			     gfp_t priority);
void __sock_wfree(struct sk_buff *skb);
void sock_wfree(struct sk_buff *skb);
void skb_orphan_partial(struct sk_buff *skb);
void sock_rfree(struct sk_buff *skb);
void sock_efree(struct sk_buff *skb);
#ifdef CONFIG_INET
void sock_edemux(struct sk_buff *skb);
#else

#define sock_edemux sock_efree
#endif

int sock_setsockopt(struct socket *sock, int level, int op,
		    char __user *optval, unsigned int optlen);

int sock_getsockopt(struct socket *sock, int level, int op,
		    char __user *optval, int __user *optlen);
struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size,
				    int noblock, int *errcode);
struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len,
				     unsigned long data_len, int noblock,
				     int *errcode, int max_page_order);
void *sock_kmalloc(struct sock *sk, int size, gfp_t priority);
void sock_kfree_s(struct sock *sk, void *mem, int size);
void sock_kzfree_s(struct sock *sk, void *mem, int size);
void sk_send_sigurg(struct sock *sk);


struct sockcm_cookie {
	
u32 mark;
	
u16 tsflags;
};

int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg,
		     struct sockcm_cookie *sockc);
int sock_cmsg_send(struct sock *sk, struct msghdr *msg,
		   struct sockcm_cookie *sockc);

/*
 * Functions to fill in entries in struct proto_ops when a protocol
 * does not implement a particular function.
 */
int sock_no_bind(struct socket *, struct sockaddr *, int);
int sock_no_connect(struct socket *, struct sockaddr *, int, int);
int sock_no_socketpair(struct socket *, struct socket *);
int sock_no_accept(struct socket *, struct socket *, int, bool);
int sock_no_getname(struct socket *, struct sockaddr *, int *, int);
unsigned int sock_no_poll(struct file *, struct socket *,
			  struct poll_table_struct *);
int sock_no_ioctl(struct socket *, unsigned int, unsigned long);
int sock_no_listen(struct socket *, int);
int sock_no_shutdown(struct socket *, int);
int sock_no_getsockopt(struct socket *, int , int, char __user *, int __user *);
int sock_no_setsockopt(struct socket *, int, int, char __user *, unsigned int);
int sock_no_sendmsg(struct socket *, struct msghdr *, size_t);
int sock_no_recvmsg(struct socket *, struct msghdr *, size_t, int);
int sock_no_mmap(struct file *file, struct socket *sock,
		 struct vm_area_struct *vma);
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.
 */
int sock_common_getsockopt(struct socket *sock, int level, int optname,
				  char __user *optval, int __user *optlen);
int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
			int flags);
int sock_common_setsockopt(struct socket *sock, int level, int optname,
				  char __user *optval, unsigned int optlen);
int compat_sock_common_getsockopt(struct socket *sock, int level,
		int optname, char __user *optval, int __user *optlen);
int compat_sock_common_setsockopt(struct socket *sock, int level,
		int optname, char __user *optval, unsigned int optlen);

void sk_common_release(struct sock *sk);

/*
 *      Default socket callbacks and setup code
 */

/* Initialise core socket variables */
void sock_init_data(struct socket *sock, struct sock *sk);

/*
 * 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);
}

Contributors
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Linus Torvalds (pre-git)2696.30%266.67%


Arnaldo Carvalho de Melo13.70%133.33%


Total27100.00%3100.00%



/* Generic version of sock_put(), dealing with all sockets
 * (TCP_TIMEWAIT, TCP_NEW_SYN_RECV, ESTABLISHED...)
 */
void sock_gen_put(struct sock *sk);

int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested,
		     unsigned int trim_cap, bool refcounted);



static inline int sk_receive_skb(struct sock *sk, struct sk_buff *skb,
				 const int nested)
{
	return __sk_receive_skb(sk, skb, nested, 1, true);
}


Contributors
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Willem de Bruijn3394.29%150.00%


Eric Dumazet25.71%150.00%


Total35100.00%2100.00%






static inline void sk_tx_queue_set(struct sock *sk, int tx_queue)
{
	sk->sk_tx_queue_mapping = tx_queue;
}


Contributors
PersonTokensPropCommitsCommitProp
Krishna Kumar21100.00%1100.00%


Total21100.00%1100.00%






static inline void sk_tx_queue_clear(struct sock *sk)
{
	sk->sk_tx_queue_mapping = -1;
}


Contributors
PersonTokensPropCommitsCommitProp
Krishna Kumar19100.00%1100.00%


Total19100.00%1100.00%






static inline int sk_tx_queue_get(const struct sock *sk)
{
	return sk ? sk->sk_tx_queue_mapping : -1;
}


Contributors
PersonTokensPropCommitsCommitProp
Krishna Kumar1982.61%150.00%


Tom Herbert417.39%150.00%


Total23100.00%2100.00%






static inline void sk_set_socket(struct sock *sk, struct socket *sock)
{
	sk_tx_queue_clear(sk);
	sk->sk_socket = sock;
}


Contributors
PersonTokensPropCommitsCommitProp
David S. Miller2382.14%150.00%


Krishna Kumar517.86%150.00%


Total28100.00%2100.00%






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;
}

Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet37100.00%3100.00%


Total37100.00%3100.00%



/* 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3675.00%337.50%


Arnaldo Carvalho de Melo510.42%225.00%


David S. Miller48.33%112.50%


James Morris24.17%112.50%


Eric Dumazet12.08%112.50%


Total48100.00%8100.00%






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);
	sk->sk_uid = SOCK_INODE(parent)->i_uid;
	security_sock_graft(sk, parent);
	write_unlock_bh(&sk->sk_callback_lock);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4562.50%333.33%


Lorenzo Colitti1115.28%111.11%


Venkat Yekkirala79.72%111.11%


David S. Miller45.56%111.11%


Eric Dumazet34.17%222.22%


Arnaldo Carvalho de Melo22.78%111.11%


Total72100.00%9100.00%



kuid_t sock_i_uid(struct sock *sk);
unsigned long sock_i_ino(struct sock *sk);




static inline kuid_t sock_net_uid(const struct net *net, const struct sock *sk)
{
	return sk ? sk->sk_uid : make_kuid(net->user_ns, 0);
}


Contributors
PersonTokensPropCommitsCommitProp
Lorenzo Colitti35100.00%1100.00%


Total35100.00%1100.00%






static inline u32 net_tx_rndhash(void)
{
	u32 v = prandom_u32();

	return v ?: 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet21100.00%1100.00%


Total21100.00%1100.00%






static inline void sk_set_txhash(struct sock *sk)
{
	sk->sk_txhash = net_tx_rndhash();
}


Contributors
PersonTokensPropCommitsCommitProp
Tom Herbert1894.74%150.00%


Eric Dumazet15.26%150.00%


Total19100.00%2100.00%






static inline void sk_rethink_txhash(struct sock *sk)
{
	if (sk->sk_txhash)
		sk_set_txhash(sk);
}


Contributors
PersonTokensPropCommitsCommitProp
Tom Herbert23100.00%1100.00%


Total23100.00%1100.00%





static inline struct dst_entry *

__sk_dst_get(struct sock *sk)
{
	return rcu_dereference_check(sk->sk_dst_cache,
				     lockdep_sock_is_held(sk));
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1866.67%240.00%


Eric Dumazet725.93%120.00%


Arnaldo Carvalho de Melo13.70%120.00%


Hannes Frederic Sowa13.70%120.00%


Total27100.00%5100.00%





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 && !atomic_inc_not_zero(&dst->__refcnt))
		dst = NULL;
	rcu_read_unlock();
	return dst;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3157.41%240.00%


Eric Dumazet2240.74%240.00%


Arnaldo Carvalho de Melo11.85%120.00%


Total54100.00%5100.00%






static inline void dst_negative_advice(struct sock *sk)
{
	struct dst_entry *ndst, *dst = __sk_dst_get(sk);

	sk_rethink_txhash(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_tx_queue_clear(sk);
			sk->sk_dst_pending_confirm = 0;
		}
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet6276.54%120.00%


Linus Torvalds (pre-git)78.64%120.00%


Julian Anastasov67.41%120.00%


Tom Herbert56.17%120.00%


Zhao, Gang11.23%120.00%


Total81100.00%5100.00%





static inline void

__sk_dst_set(struct sock *sk, struct dst_entry *dst)
{
	struct dst_entry *old_dst;

	sk_tx_queue_clear(sk);
	sk->sk_dst_pending_confirm = 0;
	old_dst = rcu_dereference_protected(sk->sk_dst_cache,
					    lockdep_sock_is_held(sk));
	rcu_assign_pointer(sk->sk_dst_cache, dst);
	dst_release(old_dst);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3659.02%228.57%


Eric Dumazet1219.67%228.57%


Julian Anastasov69.84%114.29%


Krishna Kumar58.20%114.29%


Arnaldo Carvalho de Melo23.28%114.29%


Total61100.00%7100.00%





static inline void

sk_dst_set(struct sock *sk, struct dst_entry *dst)
{
	struct dst_entry *old_dst;

	sk_tx_queue_clear(sk);
	sk->sk_dst_pending_confirm = 0;
	old_dst = xchg((__force struct dst_entry **)&sk->sk_dst_cache, dst);
	dst_release(old_dst);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3052.63%240.00%


Eric Dumazet2136.84%240.00%


Julian Anastasov610.53%120.00%


Total57100.00%5100.00%





static inline void

__sk_dst_reset(struct sock *sk)
{
	__sk_dst_set(sk, NULL);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1578.95%250.00%


Krishna Kumar210.53%125.00%


Eric Dumazet210.53%125.00%


Total19100.00%4100.00%





static inline void

sk_dst_reset(struct sock *sk)
{
	sk_dst_set(sk, NULL);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1684.21%266.67%


Eric Dumazet315.79%133.33%


Total19100.00%3100.00%



struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie);

struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie);




static inline void sk_dst_confirm(struct sock *sk)
{
	if (!sk->sk_dst_pending_confirm)
		sk->sk_dst_pending_confirm = 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Julian Anastasov25100.00%1100.00%


Total25100.00%1100.00%






static inline void sock_confirm_neigh(struct sk_buff *skb, struct neighbour *n)
{
	if (skb_get_dst_pending_confirm(skb)) {
		struct sock *sk = skb->sk;
		unsigned long now = jiffies;

		/* avoid dirtying neighbour */
		if (n->confirmed != now)
			n->confirmed = now;
		if (sk && sk->sk_dst_pending_confirm)
			sk->sk_dst_pending_confirm = 0;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Julian Anastasov70100.00%1100.00%


Total70100.00%1100.00%



bool sk_mc_loop(struct sock *sk);




static inline bool sk_can_gso(const struct sock *sk)
{
	return net_gso_ok(sk->sk_route_caps, sk->sk_gso_type);
}


Contributors
PersonTokensPropCommitsCommitProp
Herbert Xu2496.00%150.00%


Eric Dumazet14.00%150.00%


Total25100.00%2100.00%



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;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet2796.43%150.00%


Michał Mirosław13.57%150.00%


Total28100.00%2100.00%






static inline bool sk_check_csum_caps(struct sock *sk)
{
	return (sk->sk_route_caps & NETIF_F_HW_CSUM) ||
	       (sk->sk_family == PF_INET &&
		(sk->sk_route_caps & NETIF_F_IP_CSUM)) ||
	       (sk->sk_family == PF_INET6 &&
		(sk->sk_route_caps & NETIF_F_IPV6_CSUM));
}


Contributors
PersonTokensPropCommitsCommitProp
Tom Herbert53100.00%1100.00%


Total53100.00%1100.00%






static inline int skb_do_copy_data_nocache(struct sock *sk, struct sk_buff *skb,
					   struct iov_iter *from, char *to,
					   int copy, int offset)
{
	if (skb->ip_summed == CHECKSUM_NONE) {
		__wsum csum = 0;
		if (!csum_and_copy_from_iter_full(to, copy, &csum, from))
			return -EFAULT;
		skb->csum = csum_block_add(skb->csum, csum, offset);
	} else if (sk->sk_route_caps & NETIF_F_NOCACHE_COPY) {
		if (!copy_from_iter_full_nocache(to, copy, from))
			return -EFAULT;
	} else if (!copy_from_iter_full(to, copy, from))
		return -EFAULT;

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Tom Herbert10481.25%125.00%


Al Viro2015.62%250.00%


Wei Yongjun43.12%125.00%


Total128100.00%4100.00%






static inline int skb_add_data_nocache(struct sock *sk, struct sk_buff *skb,
				       struct iov_iter *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;
}


Contributors
PersonTokensPropCommitsCommitProp
Tom Herbert5984.29%133.33%


Wei Yongjun912.86%133.33%


Al Viro22.86%133.33%


Total70100.00%3100.00%






static inline int skb_copy_to_page_nocache(struct sock *sk, struct iov_iter *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;
}


Contributors
PersonTokensPropCommitsCommitProp
Tom Herbert9594.06%133.33%


Wei Yongjun43.96%133.33%


Al Viro21.98%133.33%


Total101100.00%3100.00%



/**
 * 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet24100.00%1100.00%


Total24100.00%1100.00%



/**
 * 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet22100.00%1100.00%


Total22100.00%1100.00%



/**
 * sk_has_allocations - check if allocations are outstanding
 * @sk: socket
 *
 * Returns true if socket has write or read allocations
 */



static inline bool sk_has_allocations(const struct sock *sk)
{
	return sk_wmem_alloc_get(sk) || sk_rmem_alloc_get(sk);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet24100.00%2100.00%


Total24100.00%2100.00%



/**
 * skwq_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 skwq_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 skwq_has_sleeper(struct socket_wq *wq)
{
	return wq && wq_has_sleeper(&wq->wait);
}


Contributors
PersonTokensPropCommitsCommitProp
Jiri Olsa1356.52%133.33%


Eric Dumazet834.78%133.33%


Herbert Xu28.70%133.33%


Total23100.00%3100.00%



/**
 * 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();
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Jiri Olsa4088.89%133.33%


Hans Verkuil48.89%133.33%


Eric Dumazet12.22%133.33%


Total45100.00%3100.00%






static inline void skb_set_hash_from_sk(struct sk_buff *skb, struct sock *sk)
{
	if (sk->sk_txhash) {
		skb->l4_hash = 1;
		skb->hash = sk->sk_txhash;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Tom Herbert39100.00%1100.00%


Total39100.00%1100.00%



void skb_set_owner_w(struct sk_buff *skb, struct sock *sk);

/*
 *      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_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);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)4072.73%240.00%


Hideo Aoki916.36%120.00%


Herbert Xu59.09%120.00%


Arnaldo Carvalho de Melo11.82%120.00%


Total55100.00%5100.00%



void sk_reset_timer(struct sock *sk, struct timer_list *timer,
		    unsigned long expires);

void sk_stop_timer(struct sock *sk, struct timer_list *timer);

int __sk_queue_drop_skb(struct sock *sk, struct sk_buff *skb,
			unsigned int flags,
			void (*destructor)(struct sock *sk,
					   struct sk_buff *skb));
int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);

int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb);
struct sk_buff *sock_dequeue_err_skb(struct sock *sk);

/*
 *      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;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2659.09%250.00%


Benjamin LaHaise1738.64%125.00%


Arnaldo Carvalho de Melo12.27%125.00%


Total44100.00%4100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)5594.83%266.67%


Arnaldo Carvalho de Melo35.17%133.33%


Total58100.00%3100.00%



/* Note:
 *  We use sk->sk_wq_raw, from contexts knowing this
 *  pointer is not NULL and cannot disappear/change.
 */



static inline void sk_set_bit(int nr, struct sock *sk)
{
	if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) &&
	    !sock_flag(sk, SOCK_FASYNC))
		return;

	set_bit(nr, &sk->sk_wq_raw->flags);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet48100.00%4100.00%


Total48100.00%4100.00%






static inline void sk_clear_bit(int nr, struct sock *sk)
{
	if ((nr == SOCKWQ_ASYNC_NOSPACE || nr == SOCKWQ_ASYNC_WAITDATA) &&
	    !sock_flag(sk, SOCK_FASYNC))
		return;

	clear_bit(nr, &sk->sk_wq_raw->flags);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet48100.00%4100.00%


Total48100.00%4100.00%






static inline void sk_wake_async(const struct sock *sk, int how, int band)
{
	if (sock_flag(sk, SOCK_FASYNC)) {
		rcu_read_lock();
		sock_wake_async(rcu_dereference(sk->sk_wq), how, band);
		rcu_read_unlock();
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3264.00%250.00%


Eric Dumazet1836.00%250.00%


Total50100.00%4100.00%



/* Since sk_{r,w}mem_alloc sums skb->truesize, even a small frame might
 * need sizeof(sk_buff) + MTU + padding, unless net driver perform copybreak.
 * Note: for send buffers, TCP works better if we can build two skbs at
 * minimum.
 */

#define TCP_SKB_MIN_TRUESIZE	(2048 + SKB_DATA_ALIGN(sizeof(struct sk_buff)))


#define SOCK_MIN_SNDBUF		(TCP_SKB_MIN_TRUESIZE * 2)

#define SOCK_MIN_RCVBUF		 TCP_SKB_MIN_TRUESIZE




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_t(u32, sk->sk_sndbuf, SOCK_MIN_SNDBUF);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo5291.23%133.33%


Daniel Borkmann35.26%133.33%


Eric Dumazet23.51%133.33%


Total57100.00%3100.00%



struct sk_buff *sk_stream_alloc_skb(struct sock *sk, int size, gfp_t gfp,
				    bool force_schedule);

/**
 * sk_page_frag - return an appropriate page_frag
 * @sk: socket
 *
 * If socket allocation mode allows current thread to sleep, it means its
 * safe to use the per task page_frag instead of the per socket one.
 */



static inline struct page_frag *sk_page_frag(struct sock *sk)
{
	if (gfpflags_allow_blocking(sk->sk_allocation))
		return &current->task_frag;

	return &sk->sk_frag;
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo1748.57%125.00%


Eric Dumazet1440.00%125.00%


Mel Gorman38.57%125.00%


Herbert Xu12.86%125.00%


Total35100.00%4100.00%



bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag);

/*
 *      Default write policy as shown to user space via poll/select/SIGIO
 */



static inline bool sock_writeable(const struct sock *sk)
{
	return atomic_read(&sk->sk_wmem_alloc) < (sk->sk_sndbuf >> 1);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1653.33%228.57%


David S. Miller826.67%114.29%


Eric Dumazet310.00%228.57%


Arnaldo Carvalho de Melo26.67%114.29%


Stephen Hemminger13.33%114.29%


Total30100.00%7100.00%






static inline gfp_t gfp_any(void)
{
	return in_softirq() ? GFP_ATOMIC : GFP_KERNEL;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)1588.24%250.00%


Al Viro15.88%125.00%


Andrew Morton15.88%125.00%


Total17100.00%4100.00%






static inline long sock_rcvtimeo(const struct sock *sk, bool noblock)
{
	return noblock ? 0 : sk->sk_rcvtimeo;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2288.00%240.00%


Arnaldo Carvalho de Melo14.00%120.00%


Stephen Hemminger14.00%120.00%


Eric Dumazet14.00%120.00%


Total25100.00%5100.00%






static inline long sock_sndtimeo(const struct sock *sk, bool noblock)
{
	return noblock ? 0 : sk->sk_sndtimeo;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2288.00%240.00%


Stephen Hemminger14.00%120.00%


Arnaldo Carvalho de Melo14.00%120.00%


Eric Dumazet14.00%120.00%


Total25100.00%5100.00%






static inline int sock_rcvlowat(const struct sock *sk, int waitall, int len)
{
	return (waitall ? len : min_t(int, sk->sk_rcvlowat, len)) ? : 1;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3587.50%342.86%


Linus Torvalds37.50%228.57%


Stephen Hemminger12.50%114.29%


Arnaldo Carvalho de Melo12.50%114.29%


Total40100.00%7100.00%



/* 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)21100.00%2100.00%


Total21100.00%2100.00%




struct sock_skb_cb {
	
u32 dropcount;
};

/* Store sock_skb_cb at the end of skb->cb[] so protocol families
 * using skb->cb[] would keep using it directly and utilize its
 * alignement guarantee.
 */

#define SOCK_SKB_CB_OFFSET ((FIELD_SIZEOF(struct sk_buff, cb) - \
                            sizeof(struct sock_skb_cb)))


#define SOCK_SKB_CB(__skb) ((struct sock_skb_cb *)((__skb)->cb + \
                            SOCK_SKB_CB_OFFSET))


#define sock_skb_cb_check_size(size) \
	BUILD_BUG_ON((size) > SOCK_SKB_CB_OFFSET)



static inline void

sock_skb_set_dropcount(const struct sock *sk, struct sk_buff *skb)
{
	SOCK_SKB_CB(skb)->dropcount = sock_flag(sk, SOCK_RXQ_OVFL) ?
						atomic_read(&sk->sk_drops) : 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Eyal Birger3378.57%266.67%


Eric Dumazet921.43%133.33%


Total42100.00%3100.00%






static inline void sk_drops_add(struct sock *sk, const struct sk_buff *skb)
{
	int segs = max_t(u16, 1, skb_shinfo(skb)->gso_segs);

	atomic_add(segs, &sk->sk_drops);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet45100.00%1100.00%


Total45100.00%1100.00%



void __sock_recv_timestamp(struct msghdr *msg, struct sock *sk,
			   struct sk_buff *skb);
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
         * - software time stamp available and wanted
         * - hardware time stamps available and wanted
         */
	if (sock_flag(sk, SOCK_RCVTSTAMP) ||
	    (sk->sk_tsflags & SOF_TIMESTAMPING_RX_SOFTWARE) ||
	    (kt && sk->sk_tsflags & SOF_TIMESTAMPING_SOFTWARE) ||
	    (hwtstamps->hwtstamp &&
	     (sk->sk_tsflags & SOF_TIMESTAMPING_RAW_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);
}


Contributors
PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)3428.57%110.00%


Patrick Ohly2621.85%110.00%


Johannes Berg2218.49%110.00%


Willem de Bruijn1714.29%110.00%


Eric Dumazet119.24%330.00%


Thomas Graf54.20%110.00%


Andi Kleen32.52%110.00%


Arnaldo Carvalho de Melo10.84%110.00%


Total119100.00%10100.00%



void __sock_recv_ts_and_drops(struct msghdr *msg, struct sock *sk,
			      struct sk_buff *skb);


#define SK_DEFAULT_STAMP (-1L * NSEC_PER_SEC)



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))

#define TSFLAGS_ANY	  (SOF_TIMESTAMPING_SOFTWARE                      | \
                           SOF_TIMESTAMPING_RAW_HARDWARE)

	if (sk->sk_flags & FLAGS_TS_OR_DROPS || sk->sk_tsflags & TSFLAGS_ANY)
		__sock_recv_ts_and_drops(msg, sk, skb);
	else if (unlikely(sock_flag(sk, SOCK_TIMESTAMP)))
		sk->sk_stamp = skb->tstamp;
	else if (unlikely(sk->sk_stamp == SK_DEFAULT_STAMP))
		sk->sk_stamp = 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet5458.70%250.00%


Paolo Abeni2729.35%125.00%


Willem de Bruijn1111.96%125.00%


Total92100.00%4100.00%



void __sock_tx_timestamp(__u16 tsflags, __u8 *tx_flags);

/**
 * sock_tx_timestamp - checks whether the outgoing packet is to be time stamped
 * @sk:         socket sending this packet
 * @tsflags:    timestamping flags to use
 * @tx_flags:   completed with instructions for time stamping
 *
 * Note : callers should take care of initial *tx_flags value (usually 0)
 */



static inline void sock_tx_timestamp(const struct sock *sk, __u16 tsflags,
				     __u8 *tx_flags)
{
	if (unlikely(tsflags))
		__sock_tx_timestamp(tsflags, tx_flags);
	if (unlikely(sock_flag(sk, SOCK_WIFI_STATUS)))
		*tx_flags |= SKBTX_WIFI_STATUS;
}


Contributors
PersonTokensPropCommitsCommitProp
Willem de Bruijn3364.71%116.67%


Patrick Ohly917.65%116.67%


Soheil Hassas Yeganeh59.80%116.67%


Oliver Hartkopp23.92%116.67%


Daniel Borkmann11.96%116.67%


Eric Dumazet11.96%116.67%


Total51100.00%6100.00%



/**
 * sk_eat_skb - Release a skb if it is no longer needed
 * @sk: socket to eat this skb from
 * @skb: socket buffer to eat
 *
 * This routine must be called with interrupts disabled or with the socket
 * locked so that the sk_buff queue operation is ok.
*/



static inline void sk_eat_skb(struct sock *sk, struct sk_buff *skb)
{
	__skb_unlink(skb, &sk->sk_receive_queue);
	__kfree_skb(skb);
}


Contributors
PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo32100.00%1100.00%


Total32100.00%1100.00%





static inline

struct net *sock_net(const struct sock *sk)
{
	return read_pnet(&sk->sk_net);
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明2083.33%150.00%


Eric Dumazet416.67%150.00%


Total24100.00%2100.00%





static inline

void sock_net_set(struct sock *sk, struct net *net)
{
	write_pnet(&sk->sk_net, net);
}


Contributors
PersonTokensPropCommitsCommitProp
Hideaki Yoshifuji / 吉藤英明2281.48%150.00%


Eric Dumazet518.52%150.00%


Total27100.00%2100.00%






static inline struct sock *skb_steal_sock(struct sk_buff *skb)
{
	if (skb->sk) {
		struct sock *sk = skb->sk;

		skb->destructor = NULL;
		skb->sk = NULL;
		return sk;
	}
	return NULL;
}


Contributors
PersonTokensPropCommitsCommitProp
KOVACS Krisztian49100.00%1100.00%


Total49100.00%1100.00%



/* This helper checks if a socket is a full socket,
 * ie _not_ a timewait or request socket.
 */



static inline bool sk_fullsock(const struct sock *sk)
{
	return (1 << sk->sk_state) & ~(TCPF_TIME_WAIT | TCPF_NEW_SYN_RECV);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet29100.00%1100.00%


Total29100.00%1100.00%



/* This helper checks if a socket is a LISTEN or NEW_SYN_RECV
 * SYNACK messages can be attached to either ones (depending on SYNCOOKIE)
 */



static inline bool sk_listener(const struct sock *sk)
{
	return (1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet28100.00%1100.00%


Total28100.00%1100.00%



/**
 * sk_state_load - read sk->sk_state for lockless contexts
 * @sk: socket pointer
 *
 * Paired with sk_state_store(). Used in places we do not hold socket lock :
 * tcp_diag_get_info(), tcp_get_info(), tcp_poll(), get_tcp4_sock() ...
 */



static inline int sk_state_load(const struct sock *sk)
{
	return smp_load_acquire(&sk->sk_state);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet22100.00%1100.00%


Total22100.00%1100.00%



/**
 * sk_state_store - update sk->sk_state
 * @sk: socket pointer
 * @newstate: new state
 *
 * Paired with sk_state_load(). Should be used in contexts where
 * state change might impact lockless readers.
 */



static inline void sk_state_store(struct sock *sk, int newstate)
{
	smp_store_release(&sk->sk_state, newstate);
}


Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet25100.00%1100.00%


Total25100.00%1100.00%



void sock_enable_timestamp(struct sock *sk, int flag);
int sock_get_timestamp(struct sock *, struct timeval __user *);
int sock_get_timestampns(struct sock *, struct timespec __user *);
int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, int level,
		       int type);

bool sk_ns_capable(const struct sock *sk,
		   struct user_namespace *user_ns, int cap);
bool sk_capable(const struct sock *sk, int cap);
bool sk_net_capable(const struct sock *sk, int cap);

void sk_get_meminfo(const struct sock *sk, u32 *meminfo);

extern __u32 sysctl_wmem_max;
extern __u32 sysctl_rmem_max;

extern int sysctl_tstamp_allow_data;
extern int sysctl_optmem_max;

extern __u32 sysctl_wmem_default;
extern __u32 sysctl_rmem_default;

#endif	/* _SOCK_H */

Overall Contributors
PersonTokensPropCommitsCommitProp
Eric Dumazet214823.45%10425.18%


Linus Torvalds (pre-git)158817.33%5513.32%


Arnaldo Carvalho de Melo141815.48%419.93%


Tom Herbert4785.22%112.66%


Glauber de Oliveira Costa3453.77%40.97%


Hideo Aoki2142.34%10.24%


Willem de Bruijn2072.26%81.94%


David S. Miller1842.01%102.42%


Hannes Frederic Sowa1601.75%61.45%


Pavel Emelyanov1341.46%102.42%


Mel Gorman1301.42%61.45%


Stephen Hemminger1261.38%51.21%


Eric W. Biedermann1251.36%102.42%


Julian Anastasov1171.28%20.48%


Dmitry Mishin1021.11%10.24%


Herbert Xu900.98%71.69%


Paolo Abeni790.86%20.48%


Krishna Kumar760.83%10.24%


Craig Gallek750.82%51.21%


Christoph Hellwig690.75%10.24%


Daniel Borkmann680.74%40.97%


Lorenzo Colitti640.70%20.48%


Peter Zijlstra630.69%30.73%


Eyal Birger610.67%30.73%


Jiri Olsa560.61%10.24%


KOVACS Krisztian490.53%10.24%


Yi Zhu470.51%20.48%


David Ahern460.50%10.24%


Johannes Berg440.48%10.24%


Hideaki Yoshifuji / 吉藤英明420.46%10.24%


Patrick Ohly410.45%10.24%


Al Viro390.43%61.45%


Andrew Morton360.39%30.73%


Thomas Graf340.37%71.69%


Linus Torvalds340.37%71.69%


Alexey Kuznetsov330.36%20.48%


Andi Kleen270.29%20.48%


Edward Hyunkoo Jee270.29%10.24%


Ursula Braun260.28%20.48%


samanthakumar260.28%20.48%


Li Zefan260.28%10.24%


Ralf Bächle250.27%10.24%


Johannes Weiner250.27%40.97%


Richard Cochran230.25%10.24%


Pravin B Shelar230.25%10.24%


Ingo Molnar220.24%30.73%


Neil Horman190.21%10.24%


Alexander Duyck190.21%20.48%


Wei Yongjun170.19%10.24%


Benjamin LaHaise170.19%10.24%


Alexey Dobriyan160.17%40.97%


Harvey Harrison150.16%10.24%


Joshua Hunt140.15%10.24%


James Morris140.15%30.73%


David Held120.13%10.24%


David Howells110.12%10.24%


Soheil Hassas Yeganeh110.12%20.48%


Eliezer Tamir100.11%20.48%


Tejun Heo90.10%20.48%


Venkat Yekkirala70.08%10.24%


Sabrina Dubroca60.07%10.24%


Denys Vlasenko60.07%20.48%


Américo Wang50.05%30.73%


Zhi Yong Wu50.05%10.24%


Shirley Ma50.05%10.24%


Andrey Ryabinin50.05%10.24%


Sasha Levin50.05%10.24%


Akinobu Mita40.04%10.24%


Hans Verkuil40.04%10.24%


Joe Perches40.04%10.24%


Marcelo Ricardo Leitner40.04%10.24%


Randy Dunlap40.04%10.24%


Ben Greear30.03%10.24%


Ben Hutchings30.03%10.24%


Paul Gortmaker30.03%10.24%


Denis V. Lunev30.03%10.24%


Ilpo Järvinen30.03%10.24%


Vincent Bernat30.03%10.24%


Changli Gao30.03%10.24%


Jacob E Keller30.03%10.24%


John Heffner20.02%10.24%


Christoph Lameter20.02%10.24%


Oliver Hartkopp20.02%10.24%


Brian Haley10.01%10.24%


Zhaowei Yuan10.01%10.24%


Dan J Williams10.01%10.24%


Paul E. McKenney10.01%10.24%


Ying Xue10.01%10.24%


Christopher Leech10.01%10.24%


Christoph Paasch10.01%10.24%


Jesper Juhl10.01%10.24%


Michał Mirosław10.01%10.24%


Geliang Tang10.01%10.24%


Zhao, Gang10.01%10.24%


Total9161100.00%413100.00%


Directory: include/net



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