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authorArnaldo Carvalho de Melo <acme@ghostprotocols.net>2005-06-18 22:47:59 -0700
committerDavid S. Miller <davem@davemloft.net>2005-06-18 22:47:59 -0700
commit0e87506fcc734647c7b2497eee4eb81e785c857a (patch)
treebb8863c59fdef2628f17b6773c52801792a57722 /net/core/request_sock.c
parent60236fdd08b2169045a3bbfc5ffe1576e6c3c17b (diff)
[NET] Generalise tcp_listen_opt
This chunks out the accept_queue and tcp_listen_opt code and moves them to net/core/request_sock.c and include/net/request_sock.h, to make it useful for other transport protocols, DCCP being the first one to use it. Next patches will rename tcp_listen_opt to accept_sock and remove the inline tcp functions that just call a reqsk_queue_ function. Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/request_sock.c')
-rw-r--r--net/core/request_sock.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/net/core/request_sock.c b/net/core/request_sock.c
new file mode 100644
index 00000000000..1258333ca00
--- /dev/null
+++ b/net/core/request_sock.c
@@ -0,0 +1,48 @@
+/*
+ * NET Generic infrastructure for Network protocols.
+ *
+ * Authors: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+ *
+ * From code originally in include/net/tcp.h
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <net/request_sock.h>
+
+int reqsk_queue_alloc(struct request_sock_queue *queue,
+ const int nr_table_entries)
+{
+ const int lopt_size = sizeof(struct tcp_listen_opt) +
+ nr_table_entries * sizeof(struct request_sock *);
+ struct tcp_listen_opt *lopt = kmalloc(lopt_size, GFP_KERNEL);
+
+ if (lopt == NULL)
+ return -ENOMEM;
+
+ memset(lopt, 0, lopt_size);
+
+ for (lopt->max_qlen_log = 6;
+ (1 << lopt->max_qlen_log) < sysctl_max_syn_backlog;
+ lopt->max_qlen_log++);
+
+ get_random_bytes(&lopt->hash_rnd, sizeof(lopt->hash_rnd));
+ rwlock_init(&queue->syn_wait_lock);
+ queue->rskq_accept_head = queue->rskq_accept_head = NULL;
+
+ write_lock_bh(&queue->syn_wait_lock);
+ queue->listen_opt = lopt;
+ write_unlock_bh(&queue->syn_wait_lock);
+
+ return 0;
+}
+
+EXPORT_SYMBOL(reqsk_queue_alloc);