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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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#include <linux/compiler.h>#include <linux/string.h>#include <linux/timer.h>#include <linux/poll.h>#include <linux/kernel.h>#include <linux/sockptr.h>
#include <net/inet_sock.h>#include <net/request_sock.h>
/* Cancel timers, when they are not required. */#undef INET_CSK_CLEAR_TIMERS
struct inet_bind_bucket;struct inet_bind2_bucket;struct tcp_congestion_ops;
/* * Pointers to address related TCP functions * (i.e. things that depend on the address family) */struct inet_connection_sock_af_ops { int (*queue_xmit)(struct sock *sk, struct sk_buff *skb, struct flowi *fl); u16 net_header_len; int (*rebuild_header)(struct sock *sk); void (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb); int (*conn_request)(struct sock *sk, struct sk_buff *skb); struct sock *(*syn_recv_sock)(const struct sock *sk, struct sk_buff *skb, struct request_sock *req, struct dst_entry *dst, struct request_sock *req_unhash, bool *own_req, void (*opt_child_init)(struct sock *newsk, const struct sock *sk)); int (*setsockopt)(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen); int (*getsockopt)(struct sock *sk, int level, int optname, char __user *optval, int __user *optlen); void (*mtu_reduced)(struct sock *sk);};
/** inet_connection_sock - INET connection oriented sock * * @icsk_accept_queue: FIFO of established children * @icsk_bind_hash: Bind node * @icsk_bind2_hash: Bind node in the bhash2 table * @icsk_delack_timer: Delayed ACK timer * @icsk_keepalive_timer: Keepalive timer * @mptcp_tout_timer: mptcp timer * @icsk_rto: Retransmit timeout * @icsk_pmtu_cookie Last pmtu seen by socket * @icsk_ca_ops Pluggable congestion control hook * @icsk_af_ops Operations which are AF_INET{4,6} specific * @icsk_ulp_ops Pluggable ULP control hook * @icsk_ulp_data ULP private data * @icsk_ca_state: Congestion control state * @icsk_retransmits: Number of unrecovered [RTO] timeouts * @icsk_pending: Scheduled timer event * @icsk_backoff: Backoff * @icsk_syn_retries: Number of allowed SYN (or equivalent) retries * @icsk_probes_out: unanswered 0 window probes * @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options) * @icsk_ack: Delayed ACK control data * @icsk_mtup; MTU probing control data * @icsk_probes_tstamp: Probe timestamp (cleared by non-zero window ack) * @icsk_user_timeout: TCP_USER_TIMEOUT value */struct inet_connection_sock { /* inet_sock has to be the first member! */ struct inet_sock icsk_inet; struct request_sock_queue icsk_accept_queue; struct inet_bind_bucket *icsk_bind_hash; struct inet_bind2_bucket *icsk_bind2_hash; struct timer_list icsk_delack_timer; union { struct timer_list icsk_keepalive_timer; struct timer_list mptcp_tout_timer; }; __u32 icsk_rto; __u32 icsk_rto_min; u32 icsk_rto_max; __u32 icsk_delack_max; __u32 icsk_pmtu_cookie; unsigned char unhashed_state; const struct tcp_congestion_ops *icsk_ca_ops; const struct inet_connection_sock_af_ops *icsk_af_ops; const struct tcp_ulp_ops *icsk_ulp_ops; void __rcu *icsk_ulp_data; unsigned int (*icsk_sync_mss)(struct sock *sk, u32 pmtu); __u8 icsk_ca_state:5, icsk_ca_initialized:1, icsk_ca_setsockopt:1, icsk_ca_dst_locked:1; __u8 icsk_retransmits; __u8 icsk_pending; __u8 icsk_backoff; __u8 icsk_syn_retries; __u8 icsk_probes_out; __u16 icsk_ext_hdr_len; struct { __u8 pending; /* ACK is pending */ __u8 quick; /* Scheduled number of quick acks */ __u8 pingpong; /* The session is interactive */ __u8 retry; /* Number of attempts */ #define ATO_BITS 8 __u32 ato:ATO_BITS, /* Predicted tick of soft clock */ lrcv_flowlabel:20, /* last received ipv6 flowlabel */ dst_quick_ack:1, /* cache dst RTAX_QUICKACK */ unused:3; __u32 lrcvtime; /* timestamp of last received data packet */ __u16 last_seg_size; /* Size of last incoming segment */ __u16 rcv_mss; /* MSS used for delayed ACK decisions */ } icsk_ack; struct { /* Range of MTUs to search */ int search_high; int search_low;
/* Information on the current probe. */ u32 probe_size:31, /* Is the MTUP feature enabled for this connection? */ enabled:1;
u32 probe_timestamp; } icsk_mtup; u32 icsk_probes_tstamp; u32 icsk_user_timeout;
u64 icsk_ca_priv[104 / sizeof(u64)];#define ICSK_CA_PRIV_SIZE sizeof_field(struct inet_connection_sock, icsk_ca_priv)};
#define ICSK_TIME_RETRANS 1 /* Retransmit timer */#define ICSK_TIME_DACK 2 /* Delayed ack timer */#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */
#define inet_csk(ptr) container_of_const(ptr, struct inet_connection_sock, icsk_inet.sk)
static inline void *inet_csk_ca(const struct sock *sk){ return (void *)inet_csk(sk)->icsk_ca_priv;}
struct sock *inet_csk_clone_lock(const struct sock *sk, const struct request_sock *req, const gfp_t priority);
enum inet_csk_ack_state_t { ICSK_ACK_SCHED = 1, ICSK_ACK_TIMER = 2, ICSK_ACK_PUSHED = 4, ICSK_ACK_PUSHED2 = 8, ICSK_ACK_NOW = 16, /* Send the next ACK immediately (once) */ ICSK_ACK_NOMEM = 32,};
void inet_csk_init_xmit_timers(struct sock *sk, void (*retransmit_handler)(struct timer_list *), void (*delack_handler)(struct timer_list *), void (*keepalive_handler)(struct timer_list *));void inet_csk_clear_xmit_timers(struct sock *sk);void inet_csk_clear_xmit_timers_sync(struct sock *sk);
static inline void inet_csk_schedule_ack(struct sock *sk){ inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;}
static inline int inet_csk_ack_scheduled(const struct sock *sk){ return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;}
static inline void inet_csk_delack_init(struct sock *sk){ memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));}
static inline unsigned long tcp_timeout_expires(const struct sock *sk){ return READ_ONCE(sk->tcp_retransmit_timer.expires);}
static inline unsigned longicsk_delack_timeout(const struct inet_connection_sock *icsk){ return READ_ONCE(icsk->icsk_delack_timer.expires);}
static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what){ struct inet_connection_sock *icsk = inet_csk(sk);
if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) { smp_store_release(&icsk->icsk_pending, 0);#ifdef INET_CSK_CLEAR_TIMERS sk_stop_timer(sk, &sk->tcp_retransmit_timer);#endif } else if (what == ICSK_TIME_DACK) { smp_store_release(&icsk->icsk_ack.pending, 0); icsk->icsk_ack.retry = 0;#ifdef INET_CSK_CLEAR_TIMERS sk_stop_timer(sk, &icsk->icsk_delack_timer);#endif } else { pr_debug("inet_csk BUG: unknown timer value\n"); }}
/* * Reset the retransmission timer */static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what, unsigned long when, const unsigned long max_when){ struct inet_connection_sock *icsk = inet_csk(sk);
if (when > max_when) { pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n", sk, what, when, (void *)_THIS_IP_); when = max_when; }
when += jiffies; if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 || what == ICSK_TIME_LOSS_PROBE || what == ICSK_TIME_REO_TIMEOUT) { smp_store_release(&icsk->icsk_pending, what); sk_reset_timer(sk, &sk->tcp_retransmit_timer, when); } else if (what == ICSK_TIME_DACK) { smp_store_release(&icsk->icsk_ack.pending, icsk->icsk_ack.pending | ICSK_ACK_TIMER); sk_reset_timer(sk, &icsk->icsk_delack_timer, when); } else { pr_debug("inet_csk BUG: unknown timer value\n"); }}
static inline unsigned longinet_csk_rto_backoff(const struct inet_connection_sock *icsk, unsigned long max_when){ u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
return (unsigned long)min_t(u64, when, max_when);}
struct sock *inet_csk_accept(struct sock *sk, struct proto_accept_arg *arg);
int inet_csk_get_port(struct sock *sk, unsigned short snum);
struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4, const struct request_sock *req);struct dst_entry *inet_csk_route_child_sock(const struct sock *sk, struct sock *newsk, const struct request_sock *req);
struct sock *inet_csk_reqsk_queue_add(struct sock *sk, struct request_sock *req, struct sock *child);bool inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req);struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child, struct request_sock *req, bool own_req);
static inline void inet_csk_reqsk_queue_added(struct sock *sk){ reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);}
static inline int inet_csk_reqsk_queue_len(const struct sock *sk){ return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);}
static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk){ return inet_csk_reqsk_queue_len(sk) > READ_ONCE(sk->sk_max_ack_backlog);}
bool inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req);
void inet_csk_destroy_sock(struct sock *sk);void inet_csk_prepare_for_destroy_sock(struct sock *sk);void inet_csk_prepare_forced_close(struct sock *sk);
/* * LISTEN is a special case for poll.. */static inline __poll_t inet_csk_listen_poll(const struct sock *sk){ return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ? (EPOLLIN | EPOLLRDNORM) : 0;}
int inet_csk_listen_start(struct sock *sk);void inet_csk_listen_stop(struct sock *sk);
/* update the fast reuse flag when adding a socket */void inet_csk_update_fastreuse(const struct sock *sk, struct inet_bind_bucket *tb, struct inet_bind2_bucket *tb2);
struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
static inline void inet_csk_enter_pingpong_mode(struct sock *sk){ inet_csk(sk)->icsk_ack.pingpong = READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_pingpong_thresh);}
static inline void inet_csk_exit_pingpong_mode(struct sock *sk){ inet_csk(sk)->icsk_ack.pingpong = 0;}
static inline bool inet_csk_in_pingpong_mode(struct sock *sk){ return inet_csk(sk)->icsk_ack.pingpong >= READ_ONCE(sock_net(sk)->ipv4.sysctl_tcp_pingpong_thresh);}
static inline void inet_csk_inc_pingpong_cnt(struct sock *sk){ struct inet_connection_sock *icsk = inet_csk(sk);
if (icsk->icsk_ack.pingpong < U8_MAX) icsk->icsk_ack.pingpong++;}
static inline bool inet_csk_has_ulp(const struct sock *sk){ return inet_test_bit(IS_ICSK, sk) && !!inet_csk(sk)->icsk_ulp_ops;}
static inline void inet_init_csk_locks(struct sock *sk){ struct inet_connection_sock *icsk = inet_csk(sk);
spin_lock_init(&icsk->icsk_accept_queue.rskq_lock); spin_lock_init(&icsk->icsk_accept_queue.fastopenq.lock);}
#endif /* _INET_CONNECTION_SOCK_H */