1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22/*
23 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
24 */
25
26#ifndef	_INET_TCP_STACK_H
27#define	_INET_TCP_STACK_H
28
29#include <sys/netstack.h>
30#include <inet/ip.h>
31#include <inet/ipdrop.h>
32#include <inet/tcp_stats.h>
33#include <sys/sunddi.h>
34#include <sys/sunldi.h>
35
36#ifdef	__cplusplus
37extern "C" {
38#endif
39
40#ifdef _KERNEL
41
42/*
43 * TCP stack instances
44 */
45struct tcp_stack {
46	netstack_t	*tcps_netstack;	/* Common netstack */
47
48	/*
49	 * Extra privileged ports. In host byte order.
50	 * Protected by tcp_epriv_port_lock.
51	 */
52#define	TCP_NUM_EPRIV_PORTS	64
53	int		tcps_g_num_epriv_ports;
54	in_port_t	tcps_g_epriv_ports[TCP_NUM_EPRIV_PORTS];
55	kmutex_t	tcps_epriv_port_lock;
56
57	/*
58	 * The smallest anonymous port in the priviledged port range which TCP
59	 * looks for free port.  Use in the option TCP_ANONPRIVBIND.
60	 */
61	in_port_t	tcps_min_anonpriv_port;
62
63	/* holds the tcp tunables */
64	struct mod_prop_info_s *tcps_propinfo_tbl;
65
66	/* Hint not protected by any lock */
67	uint_t		tcps_next_port_to_try;
68
69	/* TCP bind hash list - all tcp_t with state >= BOUND. */
70	struct tf_s	*tcps_bind_fanout;
71
72	/* TCP queue hash list - all tcp_t in case they will be an acceptor. */
73	struct tf_s	*tcps_acceptor_fanout;
74
75	/*
76	 * MIB-2 stuff for SNMP
77	 * Note: tcpInErrs {tcp 15} is accumulated in ip.c
78	 */
79	kstat_t		*tcps_mibkp;	/* kstat exporting mib2_tcp_t data */
80	kstat_t		*tcps_kstat;	/* kstat exporting tcp_stat_t data */
81
82	uint32_t	tcps_iss_incr_extra;
83				/* Incremented for each connection */
84	kmutex_t	tcps_iss_key_lock;
85	MD5_CTX		tcps_iss_key;
86
87	/* Packet dropper for TCP IPsec policy drops. */
88	ipdropper_t	tcps_dropper;
89
90	/*
91	 * These two variables control the rate for TCP to generate RSTs in
92	 * response to segments not belonging to any connections.  We limit
93	 * TCP to sent out tcp_rst_sent_rate (ndd param) number of RSTs in
94	 * each 1 second interval.  This is to protect TCP against DoS attack.
95	 */
96	int64_t		tcps_last_rst_intrvl;
97	uint32_t	tcps_rst_cnt;
98
99	ldi_ident_t	tcps_ldi_ident;
100
101	/* Used to synchronize access when reclaiming memory */
102	mblk_t		*tcps_ixa_cleanup_mp;
103	kmutex_t	tcps_ixa_cleanup_lock;
104	kcondvar_t	tcps_ixa_cleanup_cv;
105
106	/* Variables for handling kmem reclaim call back. */
107	kmutex_t	tcps_reclaim_lock;
108	boolean_t	tcps_reclaim;
109	timeout_id_t	tcps_reclaim_tid;
110	uint32_t	tcps_reclaim_period;
111
112	/* Listener connection limit configuration. */
113	kmutex_t	tcps_listener_conf_lock;
114	list_t		tcps_listener_conf;
115
116	/*
117	 * Per CPU stats
118	 *
119	 * tcps_sc: array of pointer to per CPU stats.  The i-th element in the
120	 *    array represents the stats of the CPU with cpu_seqid.
121	 * tcps_sc_cnt: number of CPU stats in the tcps_sc array.
122	 */
123	tcp_stats_cpu_t	**tcps_sc;
124	int		tcps_sc_cnt;
125};
126
127typedef struct tcp_stack tcp_stack_t;
128
129#endif /* _KERNEL */
130#ifdef	__cplusplus
131}
132#endif
133
134#endif	/* _INET_TCP_STACK_H */
135