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STRUCT SOCK(9) Linux Networking STRUCT SOCK(9)

NAME

struct_sock - network layer representation of sockets

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_RH_KABI
#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;


  RH_KABI_DEPRECATE(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;
#ifdef __GENKSYMS__
#else
#endif
#define SK_PROTOCOL_MAX U8_MAX


  int sk_wmem_queued;


  gfp_t sk_allocation;


  u32 sk_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_NETPRIO_CGROUP)


  __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);
#else
};

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_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_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_wmem_queued

persistent queue size

sk_allocation

allocation mode

sk_pacing_rate

Pacing rate (if supported by transport/packet scheduler)

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

COPYRIGHT

June 2023 Kernel Hackers Manual 3.10