xref: /illumos-gate/usr/src/uts/common/inet/tcp_stack.h (revision 45a4b79d)
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 */
139