From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 include/net/inet_timewait_sock.h | 132 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 include/net/inet_timewait_sock.h

(limited to 'include/net/inet_timewait_sock.h')

diff --git a/include/net/inet_timewait_sock.h b/include/net/inet_timewait_sock.h
new file mode 100644
index 000000000..360c48022
--- /dev/null
+++ b/include/net/inet_timewait_sock.h
@@ -0,0 +1,132 @@
+/*
+ * INET		An implementation of the TCP/IP protocol suite for the LINUX
+ *		operating system.  INET is implemented using the  BSD Socket
+ *		interface as the means of communication with the user level.
+ *
+ *		Definitions for a generic INET TIMEWAIT sock
+ *
+ *		From code originally in 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.
+ */
+#ifndef _INET_TIMEWAIT_SOCK_
+#define _INET_TIMEWAIT_SOCK_
+
+
+#include <linux/kmemcheck.h>
+#include <linux/list.h>
+#include <linux/timer.h>
+#include <linux/types.h>
+#include <linux/workqueue.h>
+
+#include <net/inet_sock.h>
+#include <net/sock.h>
+#include <net/tcp_states.h>
+#include <net/timewait_sock.h>
+
+#include <linux/atomic.h>
+
+struct inet_hashinfo;
+
+struct inet_timewait_death_row {
+	atomic_t		tw_count;
+
+	struct inet_hashinfo 	*hashinfo ____cacheline_aligned_in_smp;
+	int			sysctl_tw_recycle;
+	int			sysctl_max_tw_buckets;
+};
+
+struct inet_bind_bucket;
+
+/*
+ * This is a TIME_WAIT sock. It works around the memory consumption
+ * problems of sockets in such a state on heavily loaded servers, but
+ * without violating the protocol specification.
+ */
+struct inet_timewait_sock {
+	/*
+	 * Now struct sock also uses sock_common, so please just
+	 * don't add nothing before this first member (__tw_common) --acme
+	 */
+	struct sock_common	__tw_common;
+#define tw_family		__tw_common.skc_family
+#define tw_state		__tw_common.skc_state
+#define tw_reuse		__tw_common.skc_reuse
+#define tw_ipv6only		__tw_common.skc_ipv6only
+#define tw_bound_dev_if		__tw_common.skc_bound_dev_if
+#define tw_node			__tw_common.skc_nulls_node
+#define tw_bind_node		__tw_common.skc_bind_node
+#define tw_refcnt		__tw_common.skc_refcnt
+#define tw_hash			__tw_common.skc_hash
+#define tw_prot			__tw_common.skc_prot
+#define tw_net			__tw_common.skc_net
+#define tw_daddr        	__tw_common.skc_daddr
+#define tw_v6_daddr		__tw_common.skc_v6_daddr
+#define tw_rcv_saddr    	__tw_common.skc_rcv_saddr
+#define tw_v6_rcv_saddr    	__tw_common.skc_v6_rcv_saddr
+#define tw_dport		__tw_common.skc_dport
+#define tw_num			__tw_common.skc_num
+#define tw_cookie		__tw_common.skc_cookie
+
+	int			tw_timeout;
+	volatile unsigned char	tw_substate;
+	unsigned char		tw_rcv_wscale;
+
+	/* Socket demultiplex comparisons on incoming packets. */
+	/* these three are in inet_sock */
+	__be16			tw_sport;
+	kmemcheck_bitfield_begin(flags);
+	/* And these are ours. */
+	unsigned int		tw_kill		: 1,
+				tw_transparent  : 1,
+				tw_flowlabel	: 20,
+				tw_pad		: 2,	/* 2 bits hole */
+				tw_tos		: 8;
+	kmemcheck_bitfield_end(flags);
+	struct timer_list	tw_timer;
+	struct inet_bind_bucket	*tw_tb;
+	struct inet_timewait_death_row *tw_dr;
+};
+#define tw_tclass tw_tos
+
+static inline struct inet_timewait_sock *inet_twsk(const struct sock *sk)
+{
+	return (struct inet_timewait_sock *)sk;
+}
+
+void inet_twsk_free(struct inet_timewait_sock *tw);
+void inet_twsk_put(struct inet_timewait_sock *tw);
+
+int inet_twsk_unhash(struct inet_timewait_sock *tw);
+
+int inet_twsk_bind_unhash(struct inet_timewait_sock *tw,
+			  struct inet_hashinfo *hashinfo);
+
+struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk,
+					   struct inet_timewait_death_row *dr,
+					   const int state);
+
+void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
+			   struct inet_hashinfo *hashinfo);
+
+void inet_twsk_schedule(struct inet_timewait_sock *tw, const int timeo);
+void inet_twsk_deschedule(struct inet_timewait_sock *tw);
+
+void inet_twsk_purge(struct inet_hashinfo *hashinfo,
+		     struct inet_timewait_death_row *twdr, int family);
+
+static inline
+struct net *twsk_net(const struct inet_timewait_sock *twsk)
+{
+	return read_pnet(&twsk->tw_net);
+}
+
+static inline
+void twsk_net_set(struct inet_timewait_sock *twsk, struct net *net)
+{
+	write_pnet(&twsk->tw_net, net);
+}
+#endif	/* _INET_TIMEWAIT_SOCK_ */
-- 
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