1 /*
2  * include/types/stream_interface.h
3  * This file describes the stream_interface struct and associated constants.
4  *
5  * Copyright (C) 2000-2014 Willy Tarreau - w@1wt.eu
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation, version 2.1
10  * exclusively.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
20  */
21 
22 #ifndef _TYPES_STREAM_INTERFACE_H
23 #define _TYPES_STREAM_INTERFACE_H
24 
25 #include <types/obj_type.h>
26 #include <common/config.h>
27 
28 /* A stream interface must have its own errors independently of the buffer's,
29  * so that applications can rely on what the buffer reports while the stream
30  * interface is performing some retries (eg: connection error). Some states are
31  * transient and do not last beyond process_session().
32  */
33 enum si_state {
34 	SI_ST_INI = 0,           /* interface not sollicitated yet */
35 	SI_ST_REQ,               /* [transient] connection initiation desired and not started yet */
36 	SI_ST_QUE,               /* interface waiting in queue */
37 	SI_ST_TAR,               /* interface in turn-around state after failed connect attempt */
38 	SI_ST_ASS,               /* server just assigned to this interface */
39 	SI_ST_CON,               /* initiated connection request (resource exists) */
40 	SI_ST_CER,               /* [transient] previous connection attempt failed (resource released) */
41 	SI_ST_RDY,               /* [transient] ready proven after I/O success during SI_ST_CON */
42 	SI_ST_EST,               /* connection established (resource exists) */
43 	SI_ST_DIS,               /* [transient] disconnected from other side, but cleanup not done yet */
44 	SI_ST_CLO,               /* stream intf closed, might not existing anymore. Buffers shut. */
45 } __attribute__((packed));
46 
47 /* state bits for use with lists of states */
48 enum si_state_bit {
49 	SI_SB_NONE = 0,
50 	SI_SB_INI = 1U << SI_ST_INI,
51 	SI_SB_REQ = 1U << SI_ST_REQ,
52 	SI_SB_QUE = 1U << SI_ST_QUE,
53 	SI_SB_TAR = 1U << SI_ST_TAR,
54 	SI_SB_ASS = 1U << SI_ST_ASS,
55 	SI_SB_CON = 1U << SI_ST_CON,
56 	SI_SB_CER = 1U << SI_ST_CER,
57 	SI_SB_RDY = 1U << SI_ST_RDY,
58 	SI_SB_EST = 1U << SI_ST_EST,
59 	SI_SB_DIS = 1U << SI_ST_DIS,
60 	SI_SB_CLO = 1U << SI_ST_CLO,
61 	SI_SB_ALL = SI_SB_INI|SI_SB_REQ|SI_SB_QUE|SI_SB_TAR|SI_SB_ASS|SI_SB_CON|SI_SB_CER|SI_SB_RDY|SI_SB_EST|SI_SB_DIS|SI_SB_CLO,
62 };
63 
64 /* error types reported on the streams interface for more accurate reporting */
65 enum {
66 	SI_ET_NONE       = 0x0000,  /* no error yet, leave it to zero */
67 	SI_ET_QUEUE_TO   = 0x0001,  /* queue timeout */
68 	SI_ET_QUEUE_ERR  = 0x0002,  /* queue error (eg: full) */
69 	SI_ET_QUEUE_ABRT = 0x0004,  /* aborted in queue by external cause */
70 	SI_ET_CONN_TO    = 0x0008,  /* connection timeout */
71 	SI_ET_CONN_ERR   = 0x0010,  /* connection error (eg: no server available) */
72 	SI_ET_CONN_ABRT  = 0x0020,  /* connection aborted by external cause (eg: abort) */
73 	SI_ET_CONN_RES   = 0x0040,  /* connection aborted due to lack of resources */
74 	SI_ET_CONN_OTHER = 0x0080,  /* connection aborted for other reason (eg: 500) */
75 	SI_ET_DATA_TO    = 0x0100,  /* timeout during data phase */
76 	SI_ET_DATA_ERR   = 0x0200,  /* error during data phase */
77 	SI_ET_DATA_ABRT  = 0x0400,  /* data phase aborted by external cause */
78 };
79 
80 /* flags set after I/O (32 bit) */
81 enum {
82 	SI_FL_NONE       = 0x00000000,  /* nothing */
83 	SI_FL_EXP        = 0x00000001,  /* timeout has expired */
84 	SI_FL_ERR        = 0x00000002,  /* a non-recoverable error has occurred */
85 	SI_FL_KILL_CONN  = 0x00000004,  /* next shutw must kill the whole conn, not just the stream */
86 	SI_FL_WAIT_DATA  = 0x00000008,  /* stream-int waits for more outgoing data to send */
87 	SI_FL_ISBACK     = 0x00000010,  /* 0 for front-side SI, 1 for back-side */
88 	SI_FL_DONT_WAKE  = 0x00000020,  /* resync in progress, don't wake up */
89 	SI_FL_INDEP_STR  = 0x00000040,  /* independent streams = don't update rex on write */
90 	SI_FL_NOLINGER   = 0x00000080,  /* may close without lingering. One-shot. */
91 	SI_FL_NOHALF     = 0x00000100,  /* no half close, close both sides at once */
92 	SI_FL_SRC_ADDR   = 0x00001000,  /* get the source ip/port with getsockname */
93 	/* unused: 0x00000200 */
94 	SI_FL_WANT_GET   = 0x00004000,  /* a stream-int would like to get some data from the buffer */
95 	SI_FL_CLEAN_ABRT = 0x00008000,  /* SI_FL_ERR is used to report aborts, and not SHUTR */
96 
97 	SI_FL_RXBLK_CHAN = 0x00010000,  /* the channel doesn't want the stream-int to introduce data */
98 	SI_FL_RXBLK_BUFF = 0x00020000,  /* stream-int waits for a buffer allocation to complete */
99 	SI_FL_RXBLK_ROOM = 0x00040000,  /* stream-int waits for more buffer room to store incoming data */
100 	SI_FL_RXBLK_SHUT = 0x00080000,  /* input is now closed, nothing new will ever come */
101 	SI_FL_RXBLK_CONN = 0x00100000,  /* other side is not connected */
102 	SI_FL_RXBLK_ANY  = 0x001F0000,  /* any of the RXBLK flags above */
103 	SI_FL_RX_WAIT_EP = 0x00200000,  /* stream-int waits for more data from the end point */
104 	SI_FL_L7_RETRY   = 0x01000000,  /* The stream interface may attempt L7 retries */
105 	SI_FL_D_L7_RETRY = 0x02000000,  /* Disable L7 retries on this stream interface, even if configured to do it */
106 };
107 
108 /* A stream interface has 3 parts :
109  *  - the buffer side, which interfaces to the buffers.
110  *  - the remote side, which describes the state and address of the other side.
111  *  - the functions, which are used by the buffer side to communicate with the
112  *    remote side from the buffer side.
113  */
114 
115 /* Note that if an applet is registered, the update function will not be called
116  * by the session handler, so it may be used to resync flags at the end of the
117  * applet handler. See si_update() for reference.
118  */
119 struct stream_interface {
120 	/* struct members used by the "buffer" side */
121 	enum si_state state;     /* SI_ST* */
122 	enum si_state prev_state;/* SI_ST*, copy of previous state */
123 	/* 16-bit hole here */
124 	unsigned int flags;     /* SI_FL_* */
125 	enum obj_type *end;     /* points to the end point (connection or appctx) */
126 	struct si_ops *ops;     /* general operations at the stream interface layer */
127 	unsigned int exp;       /* wake up time for connect, queue, turn-around, ... */
128 
129 	/* struct members below are the "remote" part, as seen from the buffer side */
130 	unsigned int err_type;  /* first error detected, one of SI_ET_* */
131 	int conn_retries;	/* number of connect retries left */
132 	unsigned int hcto;      /* half-closed timeout (0 = unset) */
133 	struct wait_event wait_event; /* We're in a wait list */
134 	struct buffer l7_buffer; /* To store the data, in case we have to retry */
135 };
136 
137 /* operations available on a stream-interface */
138 struct si_ops {
139 	void (*chk_rcv)(struct stream_interface *); /* chk_rcv function, may not be null */
140 	void (*chk_snd)(struct stream_interface *); /* chk_snd function, may not be null */
141 	void (*shutr)(struct stream_interface *);   /* shut read function, may not be null */
142 	void (*shutw)(struct stream_interface *);   /* shut write function, may not be null */
143 };
144 
145 #endif /* _TYPES_STREAM_INTERFACE_H */
146 
147 /*
148  * Local variables:
149  *  c-indent-level: 8
150  *  c-basic-offset: 8
151  * End:
152  */
153