tcp_stack.h revision 12016:0248e987199b 
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 2010 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#ifndef	_INET_TCP_STACK_H
28#define	_INET_TCP_STACK_H
29
30#include <sys/netstack.h>
31#include <inet/ip.h>
32#include <inet/ipdrop.h>
33#include <inet/tcp_stats.h>
34#include <sys/sunddi.h>
35#include <sys/sunldi.h>
36
37#ifdef	__cplusplus
38extern "C" {
39#endif
40
41#ifdef _KERNEL
42
43/*
44 * TCP stack instances
45 */
46struct tcp_stack {
47	netstack_t	*tcps_netstack;	/* Common netstack */
48
49	/*
50	 * Extra privileged ports. In host byte order.
51	 * Protected by tcp_epriv_port_lock.
52	 */
53#define	TCP_NUM_EPRIV_PORTS	64
54	int		tcps_g_num_epriv_ports;
55	in_port_t	tcps_g_epriv_ports[TCP_NUM_EPRIV_PORTS];
56	kmutex_t	tcps_epriv_port_lock;
57
58	/*
59	 * The smallest anonymous port in the priviledged port range which TCP
60	 * looks for free port.  Use in the option TCP_ANONPRIVBIND.
61	 */
62	in_port_t	tcps_min_anonpriv_port;
63
64	/* holds the tcp tunables */
65	struct mod_prop_info_s *tcps_propinfo_tbl;
66
67	/* Hint not protected by any lock */
68	uint_t		tcps_next_port_to_try;
69
70	/* TCP bind hash list - all tcp_t with state >= BOUND. */
71	struct tf_s	*tcps_bind_fanout;
72
73	/* TCP queue hash list - all tcp_t in case they will be an acceptor. */
74	struct tf_s	*tcps_acceptor_fanout;
75
76	/*
77	 * MIB-2 stuff for SNMP
78	 * Note: tcpInErrs {tcp 15} is accumulated in ip.c
79	 */
80	kstat_t		*tcps_mibkp;	/* kstat exporting tcp_mib data */
81	kstat_t		*tcps_kstat;
82
83	uint32_t	tcps_iss_incr_extra;
84				/* Incremented for each connection */
85	kmutex_t	tcps_iss_key_lock;
86	MD5_CTX		tcps_iss_key;
87
88	/* Packet dropper for TCP IPsec policy drops. */
89	ipdropper_t	tcps_dropper;
90
91	/*
92	 * These two variables control the rate for TCP to generate RSTs in
93	 * response to segments not belonging to any connections.  We limit
94	 * TCP to sent out tcp_rst_sent_rate (ndd param) number of RSTs in
95	 * each 1 second interval.  This is to protect TCP against DoS attack.
96	 */
97	int64_t		tcps_last_rst_intrvl;
98	uint32_t	tcps_rst_cnt;
99
100	ldi_ident_t	tcps_ldi_ident;
101
102	/* Used to synchronize access when reclaiming memory */
103	mblk_t		*tcps_ixa_cleanup_mp;
104	kmutex_t	tcps_ixa_cleanup_lock;
105	kcondvar_t	tcps_ixa_cleanup_cv;
106
107	/* Variables for handling kmem reclaim call back. */
108	kmutex_t	tcps_reclaim_lock;
109	boolean_t	tcps_reclaim;
110	timeout_id_t	tcps_reclaim_tid;
111	uint32_t	tcps_reclaim_period;
112
113	/* Listener connection limit configuration. */
114	kmutex_t	tcps_listener_conf_lock;
115	list_t		tcps_listener_conf;
116
117	/*
118	 * Per CPU stats
119	 *
120	 * tcps_sc: array of pointer to per CPU stats.  The i-th element in the
121	 *    array represents the stats of the CPU with cpu_seqid.
122	 * tcps_sc_cnt: number of CPU stats in the tcps_sc array.
123	 */
124	tcp_stats_cpu_t	**tcps_sc;
125	int		tcps_sc_cnt;
126};
127
128typedef struct tcp_stack tcp_stack_t;
129
130#endif /* _KERNEL */
131#ifdef	__cplusplus
132}
133#endif
134
135#endif	/* _INET_TCP_STACK_H */
136