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 * Copyright (c) 2017 by Delphix. All rights reserved.
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
38 extern "C" {
39 #endif
40
41 #ifdef _KERNEL
42
43 /*
44 * TCP stack instances
45 */
46 struct 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 mib2_tcp_t data */
81 kstat_t *tcps_kstat; /* kstat exporting tcp_stat_t data */
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_ready_cv;
106 kcondvar_t tcps_ixa_cleanup_done_cv;
107
108 /* Variables for handling kmem reclaim call back. */
109 kmutex_t tcps_reclaim_lock;
110 boolean_t tcps_reclaim;
111 timeout_id_t tcps_reclaim_tid;
112 uint32_t tcps_reclaim_period;
113
114 /* Listener connection limit configuration. */
115 kmutex_t tcps_listener_conf_lock;
116 list_t tcps_listener_conf;
117
118 struct cc_algo *tcps_default_cc_algo;
119
120 /*
121 * Per CPU stats
122 *
123 * tcps_sc: array of pointer to per CPU stats. The i-th element in the
124 * array represents the stats of the CPU with cpu_seqid.
125 * tcps_sc_cnt: number of CPU stats in the tcps_sc array.
126 */
127 tcp_stats_cpu_t **tcps_sc;
128 int tcps_sc_cnt;
129 };
130
131 typedef struct tcp_stack tcp_stack_t;
132
133 #endif /* _KERNEL */
134 #ifdef __cplusplus
135 }
136 #endif
137
138 #endif /* _INET_TCP_STACK_H */