1 files changed, 0 insertions, 127 deletions
diff --git a/net/core/request_sock.c b/net/core/request_sock.c
deleted file mode 100644
index 897a8f01a67b..000000000000
--- a/net/core/request_sock.c
+++ /dev/null
@@ -1,127 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/*
- * NET		Generic infrastructure for Network protocols.
- *
- * Authors:	Arnaldo Carvalho de Melo <acme@conectiva.com.br>
- *
- * 		From code originally in include/net/tcp.h
- */
-
-#include <linux/module.h>
-#include <linux/random.h>
-#include <linux/slab.h>
-#include <linux/string.h>
-#include <linux/tcp.h>
-#include <linux/vmalloc.h>
-
-#include <net/request_sock.h>
-
-/*
- * Maximum number of SYN_RECV sockets in queue per LISTEN socket.
- * One SYN_RECV socket costs about 80bytes on a 32bit machine.
- * It would be better to replace it with a global counter for all sockets
- * but then some measure against one socket starving all other sockets
- * would be needed.
- *
- * The minimum value of it is 128. Experiments with real servers show that
- * it is absolutely not enough even at 100conn/sec. 256 cures most
- * of problems.
- * This value is adjusted to 128 for low memory machines,
- * and it will increase in proportion to the memory of machine.
- * Note : Dont forget somaxconn that may limit backlog too.
- */
-
-void reqsk_queue_alloc(struct request_sock_queue *queue)
-{
-	queue->fastopenq.rskq_rst_head = NULL;
-	queue->fastopenq.rskq_rst_tail = NULL;
-	queue->fastopenq.qlen = 0;
-
-	queue->rskq_accept_head = NULL;
-}
-
-/*
- * This function is called to set a Fast Open socket's "fastopen_rsk" field
- * to NULL when a TFO socket no longer needs to access the request_sock.
- * This happens only after 3WHS has been either completed or aborted (e.g.,
- * RST is received).
- *
- * Before TFO, a child socket is created only after 3WHS is completed,
- * hence it never needs to access the request_sock. things get a lot more
- * complex with TFO. A child socket, accepted or not, has to access its
- * request_sock for 3WHS processing, e.g., to retransmit SYN-ACK pkts,
- * until 3WHS is either completed or aborted. Afterwards the req will stay
- * until either the child socket is accepted, or in the rare case when the
- * listener is closed before the child is accepted.
- *
- * In short, a request socket is only freed after BOTH 3WHS has completed
- * (or aborted) and the child socket has been accepted (or listener closed).
- * When a child socket is accepted, its corresponding req->sk is set to
- * NULL since it's no longer needed. More importantly, "req->sk == NULL"
- * will be used by the code below to determine if a child socket has been
- * accepted or not, and the check is protected by the fastopenq->lock
- * described below.
- *
- * Note that fastopen_rsk is only accessed from the child socket's context
- * with its socket lock held. But a request_sock (req) can be accessed by
- * both its child socket through fastopen_rsk, and a listener socket through
- * icsk_accept_queue.rskq_accept_head. To protect the access a simple spin
- * lock per listener "icsk->icsk_accept_queue.fastopenq->lock" is created.
- * only in the rare case when both the listener and the child locks are held,
- * e.g., in inet_csk_listen_stop() do we not need to acquire the lock.
- * The lock also protects other fields such as fastopenq->qlen, which is
- * decremented by this function when fastopen_rsk is no longer needed.
- *
- * Note that another solution was to simply use the existing socket lock
- * from the listener. But first socket lock is difficult to use. It is not
- * a simple spin lock - one must consider sock_owned_by_user() and arrange
- * to use sk_add_backlog() stuff. But what really makes it infeasible is the
- * locking hierarchy violation. E.g., inet_csk_listen_stop() may try to
- * acquire a child's lock while holding listener's socket lock.
- *
- * This function also sets "treq->tfo_listener" to false.
- * treq->tfo_listener is used by the listener so it is protected by the
- * fastopenq->lock in this function.
- */
-void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req,
-			   bool reset)
-{
-	struct sock *lsk = req->rsk_listener;
-	struct fastopen_queue *fastopenq;
-
-	fastopenq = &inet_csk(lsk)->icsk_accept_queue.fastopenq;
-
-	RCU_INIT_POINTER(tcp_sk(sk)->fastopen_rsk, NULL);
-	spin_lock_bh(&fastopenq->lock);
-	fastopenq->qlen--;
-	tcp_rsk(req)->tfo_listener = false;
-	if (req->sk)	/* the child socket hasn't been accepted yet */
-		goto out;
-
-	if (!reset || lsk->sk_state != TCP_LISTEN) {
-		/* If the listener has been closed don't bother with the
-		 * special RST handling below.
-		 */
-		spin_unlock_bh(&fastopenq->lock);
-		reqsk_put(req);
-		return;
-	}
-	/* Wait for 60secs before removing a req that has triggered RST.
-	 * This is a simple defense against TFO spoofing attack - by
-	 * counting the req against fastopen.max_qlen, and disabling
-	 * TFO when the qlen exceeds max_qlen.
-	 *
-	 * For more details see CoNext'11 "TCP Fast Open" paper.
-	 */
-	req->rsk_timer.expires = jiffies + 60*HZ;
-	if (fastopenq->rskq_rst_head == NULL)
-		fastopenq->rskq_rst_head = req;
-	else
-		fastopenq->rskq_rst_tail->dl_next = req;
-
-	req->dl_next = NULL;
-	fastopenq->rskq_rst_tail = req;
-	fastopenq->qlen++;
-out:
-	spin_unlock_bh(&fastopenq->lock);
-}