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); 49