[ICSK]: Move generalised functions from tcp to inet_connection_sock
This also improves reqsk_queue_prune and renames it to
inet_csk_reqsk_queue_prune, as it deals with both inet_connection_sock
and inet_request_sock objects, not just with request_sock ones thus
belonging to inet_request_sock.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index b614ad4..72cec69 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -424,103 +424,14 @@
sock_put(sk);
}
-void reqsk_queue_prune(struct request_sock_queue *queue, struct sock *parent,
- const unsigned long interval, const unsigned long timeout,
- const unsigned long max_rto, int max_retries)
-{
- struct inet_connection_sock *icsk = inet_csk(parent);
- struct listen_sock *lopt = queue->listen_opt;
- int thresh = max_retries;
- unsigned long now = jiffies;
- struct request_sock **reqp, *req;
- int i, budget;
-
- if (lopt == NULL || lopt->qlen == 0)
- return;
-
- /* Normally all the openreqs are young and become mature
- * (i.e. converted to established socket) for first timeout.
- * If synack was not acknowledged for 3 seconds, it means
- * one of the following things: synack was lost, ack was lost,
- * rtt is high or nobody planned to ack (i.e. synflood).
- * When server is a bit loaded, queue is populated with old
- * open requests, reducing effective size of queue.
- * When server is well loaded, queue size reduces to zero
- * after several minutes of work. It is not synflood,
- * it is normal operation. The solution is pruning
- * too old entries overriding normal timeout, when
- * situation becomes dangerous.
- *
- * Essentially, we reserve half of room for young
- * embrions; and abort old ones without pity, if old
- * ones are about to clog our table.
- */
- if (lopt->qlen>>(lopt->max_qlen_log-1)) {
- int young = (lopt->qlen_young<<1);
-
- while (thresh > 2) {
- if (lopt->qlen < young)
- break;
- thresh--;
- young <<= 1;
- }
- }
-
- if (queue->rskq_defer_accept)
- max_retries = queue->rskq_defer_accept;
-
- budget = 2 * (lopt->nr_table_entries / (timeout / interval));
- i = lopt->clock_hand;
-
- do {
- reqp=&lopt->syn_table[i];
- while ((req = *reqp) != NULL) {
- if (time_after_eq(now, req->expires)) {
- if ((req->retrans < thresh ||
- (inet_rsk(req)->acked && req->retrans < max_retries))
- && !req->rsk_ops->rtx_syn_ack(parent, req, NULL)) {
- unsigned long timeo;
-
- if (req->retrans++ == 0)
- lopt->qlen_young--;
- timeo = min((timeout << req->retrans), max_rto);
- req->expires = now + timeo;
- reqp = &req->dl_next;
- continue;
- }
-
- /* Drop this request */
- inet_csk_reqsk_queue_unlink(parent, req, reqp);
- reqsk_queue_removed(&icsk->icsk_accept_queue, req);
- reqsk_free(req);
- continue;
- }
- reqp = &req->dl_next;
- }
-
- i = (i + 1) & (lopt->nr_table_entries - 1);
-
- } while (--budget > 0);
-
- lopt->clock_hand = i;
-
- if (lopt->qlen)
- inet_csk_reset_keepalive_timer(parent, interval);
-}
-
-EXPORT_SYMBOL_GPL(reqsk_queue_prune);
-
/*
* Timer for listening sockets
*/
static void tcp_synack_timer(struct sock *sk)
{
- struct inet_connection_sock *icsk = inet_csk(sk);
- const int max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries;
-
- reqsk_queue_prune(&icsk->icsk_accept_queue, sk, TCP_SYNQ_INTERVAL,
- TCP_TIMEOUT_INIT, TCP_RTO_MAX, max_retries);
+ inet_csk_reqsk_queue_prune(sk, TCP_SYNQ_INTERVAL,
+ TCP_TIMEOUT_INIT, TCP_RTO_MAX);
}
void tcp_set_keepalive(struct sock *sk, int val)