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
37 extern "C" {
38 #endif
39
40 #ifdef _KERNEL
41
42 /*
43 * TCP stack instances
44 */
45 struct 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_ready_cv;
105 kcondvar_t tcps_ixa_cleanup_done_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
128 typedef struct tcp_stack tcp_stack_t;
129
130 #endif /* _KERNEL */
131 #ifdef __cplusplus
132 }
133 #endif
134
135 #endif /* _INET_TCP_STACK_H */