cregit-Linux how code gets into the kernel

Release 4.11 net/core/stream.c

Directory: net/core
/*
 *     SUCS NET3:
 *
 *     Generic stream handling routines. These are generic for most
 *     protocols. Even IP. Tonight 8-).
 *     This is used because TCP, LLC (others too) layer all have mostly
 *     identical sendmsg() and recvmsg() code.
 *     So we (will) share it here.
 *
 *     Authors:        Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *                     (from old tcp.c code)
 *                     Alan Cox <alan@lxorguk.ukuu.org.uk> (Borrowed comments 8-))
 */

#include <linux/module.h>
#include <linux/sched/signal.h>
#include <linux/net.h>
#include <linux/signal.h>
#include <linux/tcp.h>
#include <linux/wait.h>
#include <net/sock.h>

/**
 * sk_stream_write_space - stream socket write_space callback.
 * @sk: socket
 *
 * FIXME: write proper description
 */

void sk_stream_write_space(struct sock *sk) { struct socket *sock = sk->sk_socket; struct socket_wq *wq; if (sk_stream_is_writeable(sk) && sock) { clear_bit(SOCK_NOSPACE, &sock->flags); rcu_read_lock(); wq = rcu_dereference(sk->sk_wq); if (skwq_has_sleeper(wq)) wake_up_interruptible_poll(&wq->wait, POLLOUT | POLLWRNORM | POLLWRBAND); if (wq && wq->fasync_list && !(sk->sk_shutdown & SEND_SHUTDOWN)) sock_wake_async(wq, SOCK_WAKE_SPACE, POLL_OUT); rcu_read_unlock(); } }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo6560.75%112.50%
Eric Dumazet3330.84%450.00%
John Dykstra76.54%112.50%
Herbert Xu10.93%112.50%
Pavel Emelyanov10.93%112.50%
Total107100.00%8100.00%

/** * sk_stream_wait_connect - Wait for a socket to get into the connected state * @sk: sock to wait on * @timeo_p: for how long to wait * * Must be called with the socket locked. */
int sk_stream_wait_connect(struct sock *sk, long *timeo_p) { DEFINE_WAIT_FUNC(wait, woken_wake_function); struct task_struct *tsk = current; int done; do { int err = sock_error(sk); if (err) return err; if ((1 << sk->sk_state) & ~(TCPF_SYN_SENT | TCPF_SYN_RECV)) return -EPIPE; if (!*timeo_p) return -EAGAIN; if (signal_pending(tsk)) return sock_intr_errno(*timeo_p); add_wait_queue(sk_sleep(sk), &wait); sk->sk_write_pending++; done = sk_wait_event(sk, timeo_p, !sk->sk_err && !((1 << sk->sk_state) & ~(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT)), &wait); remove_wait_queue(sk_sleep(sk), &wait); sk->sk_write_pending--; } while (!done); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo12472.94%120.00%
Benjamin LaHaise158.82%120.00%
Herbert Xu137.65%120.00%
Américo Wang127.06%120.00%
Eric Dumazet63.53%120.00%
Total170100.00%5100.00%

EXPORT_SYMBOL(sk_stream_wait_connect); /** * sk_stream_closing - Return 1 if we still have things to send in our buffers. * @sk: socket to verify */
static inline int sk_stream_closing(struct sock *sk) { return (1 << sk->sk_state) & (TCPF_FIN_WAIT1 | TCPF_CLOSING | TCPF_LAST_ACK); }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo29100.00%1100.00%
Total29100.00%1100.00%


void sk_stream_wait_close(struct sock *sk, long timeout) { if (timeout) { DEFINE_WAIT_FUNC(wait, woken_wake_function); add_wait_queue(sk_sleep(sk), &wait); do { if (sk_wait_event(sk, &timeout, !sk_stream_closing(sk), &wait)) break; } while (!signal_pending(current) && timeout); remove_wait_queue(sk_sleep(sk), &wait); } }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo6680.49%133.33%
Américo Wang1012.20%133.33%
Eric Dumazet67.32%133.33%
Total82100.00%3100.00%

EXPORT_SYMBOL(sk_stream_wait_close); /** * sk_stream_wait_memory - Wait for more memory for a socket * @sk: socket to wait for memory * @timeo_p: for how long */
int sk_stream_wait_memory(struct sock *sk, long *timeo_p) { int err = 0; long vm_wait = 0; long current_timeo = *timeo_p; bool noblock = (*timeo_p ? false : true); DEFINE_WAIT_FUNC(wait, woken_wake_function); if (sk_stream_memory_free(sk)) current_timeo = vm_wait = (prandom_u32() % (HZ / 5)) + 2; add_wait_queue(sk_sleep(sk), &wait); while (1) { sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); if (sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN)) goto do_error; if (!*timeo_p) { if (noblock) set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); goto do_nonblock; } if (signal_pending(current)) goto do_interrupted; sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); if (sk_stream_memory_free(sk) && !vm_wait) break; set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); sk->sk_write_pending++; sk_wait_event(sk, &current_timeo, sk->sk_err || (sk->sk_shutdown & SEND_SHUTDOWN) || (sk_stream_memory_free(sk) && !vm_wait), &wait); sk->sk_write_pending--; if (vm_wait) { vm_wait -= current_timeo; current_timeo = *timeo_p; if (current_timeo != MAX_SCHEDULE_TIMEOUT && (current_timeo -= vm_wait) < 0) current_timeo = 0; vm_wait = 0; } *timeo_p = current_timeo; } out: remove_wait_queue(sk_sleep(sk), &wait); return err; do_error: err = -EPIPE; goto out; do_nonblock: err = -EAGAIN; goto out; do_interrupted: err = sock_intr_errno(*timeo_p); goto out; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo24477.46%112.50%
Jason Baron309.52%112.50%
Américo Wang185.71%112.50%
Benjamin LaHaise103.17%112.50%
Eric Dumazet72.22%225.00%
Nagendra Tomar51.59%112.50%
Aruna-Hewapathirane10.32%112.50%
Total315100.00%8100.00%

EXPORT_SYMBOL(sk_stream_wait_memory);
int sk_stream_error(struct sock *sk, int flags, int err) { if (err == -EPIPE) err = sock_error(sk) ? : -EPIPE; if (err == -EPIPE && !(flags & MSG_NOSIGNAL)) send_sig(SIGPIPE, current, 0); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo60100.00%1100.00%
Total60100.00%1100.00%

EXPORT_SYMBOL(sk_stream_error);
void sk_stream_kill_queues(struct sock *sk) { /* First the read buffer. */ __skb_queue_purge(&sk->sk_receive_queue); /* Next, the error queue. */ __skb_queue_purge(&sk->sk_error_queue); /* Next, the write queue. */ WARN_ON(!skb_queue_empty(&sk->sk_write_queue)); /* Account for returned memory. */ sk_mem_reclaim(sk); WARN_ON(sk->sk_wmem_queued); WARN_ON(sk->sk_forward_alloc); /* It is _impossible_ for the backlog to contain anything * when we get here. All user references to this socket * have gone away, only the net layer knows can touch it. */ }

Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo5791.94%133.33%
Ilpo Järvinen46.45%133.33%
Hideo Aoki11.61%133.33%
Total62100.00%3100.00%

EXPORT_SYMBOL(sk_stream_kill_queues);

Overall Contributors

PersonTokensPropCommitsCommitProp
Arnaldo Carvalho de Melo68878.54%624.00%
Eric Dumazet525.94%520.00%
Américo Wang404.57%14.00%
Jason Baron303.42%14.00%
Benjamin LaHaise252.85%14.00%
Herbert Xu141.60%28.00%
John Dykstra70.80%14.00%
Nagendra Tomar50.57%14.00%
Ilpo Järvinen40.46%14.00%
Pavel Pisa40.46%14.00%
Ingo Molnar30.34%14.00%
Pavel Emelyanov10.11%14.00%
Hideo Aoki10.11%14.00%
Alan Cox10.11%14.00%
Aruna-Hewapathirane10.11%14.00%
Total876100.00%25100.00%
Directory: net/core
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