[NET] rename struct tcp_listen_opt to struct listen_sock
[linux-2.6.git] / net / core / request_sock.c
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
21 int reqsk_queue_alloc(struct request_sock_queue *queue,
22                       const int nr_table_entries)
23 {
24         const int lopt_size = sizeof(struct listen_sock) +
25                               nr_table_entries * sizeof(struct request_sock *);
26         struct listen_sock *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
48 EXPORT_SYMBOL(reqsk_queue_alloc);