request_sock.c revision 0e87506fcc734647c7b2497eee4eb81e785c857a 
1/*
2 * NET		Generic infrastructure for Network protocols.
3 *
4 * Authors:	Arnaldo Carvalho de Melo <acme@conectiva.com.br>
5 *
6 * 		From code originally in include/net/tcp.h
7 *
8 *		This program is free software; you can redistribute it and/or
9 *		modify it under the terms of the GNU General Public License
10 *		as published by the Free Software Foundation; either version
11 *		2 of the License, or (at your option) any later version.
12 */
13
14#include <linux/module.h>
15#include <linux/random.h>
16#include <linux/slab.h>
17#include <linux/string.h>
18
19#include <net/request_sock.h>
20
21int reqsk_queue_alloc(struct request_sock_queue *queue,
22		      const int nr_table_entries)
23{
24	const int lopt_size = sizeof(struct tcp_listen_opt) +
25			      nr_table_entries * sizeof(struct request_sock *);
26	struct tcp_listen_opt *lopt = kmalloc(lopt_size, GFP_KERNEL);
27
28	if (lopt == NULL)
29		return -ENOMEM;
30
31	memset(lopt, 0, lopt_size);
32
33	for (lopt->max_qlen_log = 6;
34	     (1 << lopt->max_qlen_log) < sysctl_max_syn_backlog;
35	     lopt->max_qlen_log++);
36
37	get_random_bytes(&lopt->hash_rnd, sizeof(lopt->hash_rnd));
38	rwlock_init(&queue->syn_wait_lock);
39	queue->rskq_accept_head = queue->rskq_accept_head = NULL;
40
41	write_lock_bh(&queue->syn_wait_lock);
42	queue->listen_opt = lopt;
43	write_unlock_bh(&queue->syn_wait_lock);
44
45	return 0;
46}
47
48EXPORT_SYMBOL(reqsk_queue_alloc);
49