SYNOPSIS

struct sock {
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_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
socket_lock_t sk_lock;
struct sk_buff_head sk_receive_queue;
struct sk_backlog;
#define sk_rmem_alloc sk_backlog.rmem_alloc
int sk_forward_alloc;
#ifdef CONFIG_RPS
__u32 sk_rxhash;
#endif
#ifdef CONFIG_NET_RX_BUSY_POLL
unsigned int sk_napi_id;
unsigned int sk_ll_usec;
#endif
atomic_t sk_drops;
int sk_rcvbuf;
struct sk_filter __rcu * sk_filter;
struct socket_wq __rcu * sk_wq;
#ifdef CONFIG_NET_DMA
struct sk_buff_head sk_async_wait_queue;
#endif
#ifdef CONFIG_XFRM
struct xfrm_policy * sk_policy[2];
#endif
unsigned long sk_flags;
struct dst_entry * sk_rx_dst;
struct dst_entry __rcu * sk_dst_cache;
spinlock_t sk_dst_lock;
atomic_t sk_wmem_alloc;
atomic_t sk_omem_alloc;
int sk_sndbuf;
struct sk_buff_head sk_write_queue;
unsigned int sk_shutdown:2;
unsigned int sk_no_check:2;
unsigned int sk_userlocks:4;
unsigned int sk_protocol:8;
unsigned int sk_type:16;
int sk_wmem_queued;
gfp_t sk_allocation;
u32 sk_pacing_rate;
u32 sk_max_pacing_rate;
netdev_features_t sk_route_caps;
netdev_features_t sk_route_nocaps;
int sk_gso_type;
unsigned int sk_gso_max_size;
u16 sk_gso_max_segs;
int sk_rcvlowat;
unsigned long sk_lingertime;
struct sk_buff_head sk_error_queue;
struct proto * sk_prot_creator;
rwlock_t sk_callback_lock;
int sk_err;
int sk_err_soft;
unsigned short sk_ack_backlog;
unsigned short sk_max_ack_backlog;
__u32 sk_priority;
#if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
__u32 sk_cgrp_prioidx;
#endif
struct pid * sk_peer_pid;
const struct cred * sk_peer_cred;
long sk_rcvtimeo;
long sk_sndtimeo;
void * sk_protinfo;
struct timer_list sk_timer;
ktime_t sk_stamp;
struct socket * sk_socket;
void * sk_user_data;
struct page_frag sk_frag;
struct sk_buff * sk_send_head;
__s32 sk_peek_off;
int sk_write_pending;
#ifdef CONFIG_SECURITY
void * sk_security;
#endif
__u32 sk_mark;
u32 sk_classid;
struct cg_proto * sk_cgrp;
void (* sk_state_change) (struct sock *sk);
void (* sk_data_ready) (struct sock *sk, int bytes);
void (* sk_write_space) (struct sock *sk);
void (* sk_error_report) (struct sock *sk);
int (* sk_backlog_rcv) (struct sock *sk,struct sk_buff *skb);
void (* sk_destruct) (struct sock *sk);
};

MEMBERS

__sk_common

shared layout with inet_timewait_sock

sk_lock

synchronizer

sk_receive_queue

incoming packets

sk_backlog

always used with the per-socket spinlock held

sk_forward_alloc

space allocated forward

sk_rxhash

flow hash received from netif layer

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_drops

raw/udp drops counter

sk_rcvbuf

size of receive buffer in bytes

sk_filter

socket filtering instructions

sk_wq

sock wait queue and async head

sk_async_wait_queue

DMA copied packets

sk_policy[2]

flow policy

sk_flags

SO_LINGER (l_onoff), SO_BROADCAST, SO_KEEPALIVE, SO_OOBINLINE settings, SO_TIMESTAMPING settings

sk_rx_dst

receive input route used by early demux

sk_dst_cache

destination cache

sk_dst_lock

destination cache lock

sk_wmem_alloc

transmit queue bytes committed

sk_omem_alloc

"o" is "option" or "other"

sk_sndbuf

size of send buffer in bytes

sk_write_queue

Packet sending queue

sk_shutdown

mask of SEND_SHUTDOWN and/or RCV_SHUTDOWN

sk_no_check

SO_NO_CHECK setting, whether or not checkup packets

sk_userlocks

SO_SNDBUF and SO_RCVBUF settings

sk_protocol

which protocol this socket belongs in this network family

sk_type

socket type (SOCK_STREAM, etc)

sk_wmem_queued

persistent queue size

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_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_rcvlowat

SO_RCVLOWAT setting

sk_lingertime

SO_LINGER l_linger setting

sk_error_queue

rarely used

sk_prot_creator

sk_prot of original sock creator (see ipv6_setsockopt, IPV6_ADDRFORM for instance)

sk_callback_lock

used with the callbacks in the end of this struct

sk_err

last error

sk_err_soft

errors that don't cause failure but are the cause of a persistent failure not just 'timed out'

sk_ack_backlog

current listen backlog

sk_max_ack_backlog

listen backlog set in listen

sk_priority

SO_PRIORITY setting

sk_cgrp_prioidx

socket group's priority map index

sk_peer_pid

struct pid for this socket's peer

sk_peer_cred

SO_PEERCRED setting

sk_rcvtimeo

SO_RCVTIMEO setting

sk_sndtimeo

SO_SNDTIMEO setting

sk_protinfo

private area, net family specific, when not using slab

sk_timer

sock cleanup timer

sk_stamp

time stamp of last packet received

sk_socket

Identd and reporting IO signals

sk_user_data

RPC layer private data

sk_frag

cached page frag

sk_send_head

front of stuff to transmit

sk_peek_off

current peek_offset value

sk_write_pending

a write to stream socket waits to start

sk_security

used by security modules

sk_mark

generic packet mark

sk_classid

this socket's cgroup classid

sk_cgrp

this socket's cgroup-specific proto data

sk_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

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