summaryrefslogtreecommitdiffstats
path: root/include/net/sctp/command.h
blob: 6640f84fe5368f868e49bfb9ea2c3f94639b4e80 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
/* SCTP kernel Implementation
 * (C) Copyright IBM Corp. 2001, 2004
 * Copyright (C) 1999-2001 Cisco, Motorola
 *
 * This file is part of the SCTP kernel implementation
 *
 * These are the definitions needed for the command object.
 *
 * This SCTP implementation  is free software;
 * you can redistribute it and/or modify it under the terms of
 * the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This SCTP implementation  is distributed in the hope that it
 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 *                 ************************
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GNU CC; see the file COPYING.  If not, see
 * <http://www.gnu.org/licenses/>.
 *
 * Please send any bug reports or fixes you make to the
 * email address(es):
 *    lksctp developers <linux-sctp@vger.kernel.org>
 *
 * Written or modified by:
 *   La Monte H.P. Yarroll <piggy@acm.org>
 *   Karl Knutson <karl@athena.chicago.il.us>
 *   Ardelle Fan <ardelle.fan@intel.com>
 *   Sridhar Samudrala <sri@us.ibm.com>
 */

#ifndef __net_sctp_command_h__
#define __net_sctp_command_h__

#include <net/sctp/constants.h>
#include <net/sctp/structs.h>


enum sctp_verb {
	SCTP_CMD_NOP = 0,	/* Do nothing. */
	SCTP_CMD_NEW_ASOC,	/* Register a new association.  */
	SCTP_CMD_DELETE_TCB,	/* Delete the current association. */
	SCTP_CMD_NEW_STATE,	/* Enter a new state.  */
	SCTP_CMD_REPORT_TSN,	/* Record the arrival of a TSN.  */
	SCTP_CMD_GEN_SACK,	/* Send a Selective ACK (maybe).  */
	SCTP_CMD_PROCESS_SACK,	/* Process an inbound SACK.  */
	SCTP_CMD_GEN_INIT_ACK,	/* Generate an INIT ACK chunk.  */
	SCTP_CMD_PEER_INIT,	/* Process a INIT from the peer.  */
	SCTP_CMD_GEN_COOKIE_ECHO, /* Generate a COOKIE ECHO chunk. */
	SCTP_CMD_CHUNK_ULP,	/* Send a chunk to the sockets layer.  */
	SCTP_CMD_EVENT_ULP,	/* Send a notification to the sockets layer. */
	SCTP_CMD_REPLY,		/* Send a chunk to our peer.  */
	SCTP_CMD_SEND_PKT,	/* Send a full packet to our peer.  */
	SCTP_CMD_RETRAN,	/* Mark a transport for retransmission.  */
	SCTP_CMD_ECN_CE,        /* Do delayed CE processing.   */
	SCTP_CMD_ECN_ECNE,	/* Do delayed ECNE processing. */
	SCTP_CMD_ECN_CWR,	/* Do delayed CWR processing.  */
	SCTP_CMD_TIMER_START,	/* Start a timer.  */
	SCTP_CMD_TIMER_START_ONCE, /* Start a timer once */
	SCTP_CMD_TIMER_RESTART,	/* Restart a timer. */
	SCTP_CMD_TIMER_STOP,	/* Stop a timer. */
	SCTP_CMD_INIT_CHOOSE_TRANSPORT, /* Choose transport for an INIT. */
	SCTP_CMD_INIT_COUNTER_RESET, /* Reset init counter. */
	SCTP_CMD_INIT_COUNTER_INC,   /* Increment init counter. */
	SCTP_CMD_INIT_RESTART,  /* High level, do init timer work. */
	SCTP_CMD_COOKIEECHO_RESTART,  /* High level, do cookie-echo timer work. */
	SCTP_CMD_INIT_FAILED,   /* High level, do init failure work. */
	SCTP_CMD_REPORT_DUP,	/* Report a duplicate TSN.  */
	SCTP_CMD_STRIKE,	/* Mark a strike against a transport.  */
	SCTP_CMD_HB_TIMERS_START,    /* Start the heartbeat timers. */
	SCTP_CMD_HB_TIMER_UPDATE,    /* Update a heartbeat timers.  */
	SCTP_CMD_HB_TIMERS_STOP,     /* Stop the heartbeat timers.  */
	SCTP_CMD_TRANSPORT_HB_SENT,  /* Reset the status of a transport. */
	SCTP_CMD_TRANSPORT_IDLE,     /* Do manipulations on idle transport */
	SCTP_CMD_TRANSPORT_ON,       /* Mark the transport as active. */
	SCTP_CMD_REPORT_ERROR,   /* Pass this error back out of the sm. */
	SCTP_CMD_REPORT_BAD_TAG, /* Verification tags didn't match. */
	SCTP_CMD_PROCESS_CTSN,   /* Sideeffect from shutdown. */
	SCTP_CMD_ASSOC_FAILED,	 /* Handle association failure. */
	SCTP_CMD_DISCARD_PACKET, /* Discard the whole packet. */
	SCTP_CMD_GEN_SHUTDOWN,   /* Generate a SHUTDOWN chunk. */
	SCTP_CMD_UPDATE_ASSOC,   /* Update association information. */
	SCTP_CMD_PURGE_OUTQUEUE, /* Purge all data waiting to be sent. */
	SCTP_CMD_SETUP_T2,       /* Hi-level, setup T2-shutdown parms.  */
	SCTP_CMD_RTO_PENDING,	 /* Set transport's rto_pending. */
	SCTP_CMD_PART_DELIVER,	 /* Partial data delivery considerations. */
	SCTP_CMD_RENEGE,         /* Renege data on an association. */
	SCTP_CMD_SETUP_T4,	 /* ADDIP, setup T4 RTO timer parms. */
	SCTP_CMD_PROCESS_OPERR,  /* Process an ERROR chunk. */
	SCTP_CMD_REPORT_FWDTSN,	 /* Report new cumulative TSN Ack. */
	SCTP_CMD_PROCESS_FWDTSN, /* Skips were reported, so process further. */
	SCTP_CMD_CLEAR_INIT_TAG, /* Clears association peer's inittag. */
	SCTP_CMD_DEL_NON_PRIMARY, /* Removes non-primary peer transports. */
	SCTP_CMD_T3_RTX_TIMERS_STOP, /* Stops T3-rtx pending timers */
	SCTP_CMD_FORCE_PRIM_RETRAN,  /* Forces retrans. over primary path. */
	SCTP_CMD_SET_SK_ERR,	 /* Set sk_err */
	SCTP_CMD_ASSOC_CHANGE,	 /* generate and send assoc_change event */
	SCTP_CMD_ADAPTATION_IND, /* generate and send adaptation event */
	SCTP_CMD_PEER_NO_AUTH,   /* generate and send authentication event */
	SCTP_CMD_ASSOC_SHKEY,    /* generate the association shared keys */
	SCTP_CMD_T1_RETRAN,	 /* Mark for retransmission after T1 timeout  */
	SCTP_CMD_UPDATE_INITTAG, /* Update peer inittag */
	SCTP_CMD_SEND_MSG,	 /* Send the whole use message */
	SCTP_CMD_SEND_NEXT_ASCONF, /* Send the next ASCONF after ACK */
	SCTP_CMD_PURGE_ASCONF_QUEUE, /* Purge all asconf queues.*/
	SCTP_CMD_SET_ASOC,	 /* Restore association context */
	SCTP_CMD_LAST
};

/* How many commands can you put in an struct sctp_cmd_seq?
 * This is a rather arbitrary number, ideally derived from a careful
 * analysis of the state functions, but in reality just taken from
 * thin air in the hopes othat we don't trigger a kernel panic.
 */
#define SCTP_MAX_NUM_COMMANDS 20

union sctp_arg {
	void *zero_all;	/* Set to NULL to clear the entire union */
	__s32 i32;
	__u32 u32;
	__be32 be32;
	__u16 u16;
	__u8 u8;
	int error;
	__be16 err;
	enum sctp_state state;
	enum sctp_event_timeout to;
	struct sctp_chunk *chunk;
	struct sctp_association *asoc;
	struct sctp_transport *transport;
	struct sctp_bind_addr *bp;
	struct sctp_init_chunk *init;
	struct sctp_ulpevent *ulpevent;
	struct sctp_packet *packet;
	struct sctp_sackhdr *sackh;
	struct sctp_datamsg *msg;
};

/* We are simulating ML type constructors here.
 *
 * SCTP_ARG_CONSTRUCTOR(NAME, TYPE, ELT) builds a function called
 * SCTP_NAME() which takes an argument of type TYPE and returns an
 * union sctp_arg.  It does this by inserting the sole argument into
 * the ELT union element of a local union sctp_arg.
 *
 * E.g., SCTP_ARG_CONSTRUCTOR(I32, __s32, i32) builds SCTP_I32(arg),
 * which takes an __s32 and returns a union sctp_arg containing the
 * __s32.  So, after foo = SCTP_I32(arg), foo.i32 == arg.
 */

#define SCTP_ARG_CONSTRUCTOR(name, type, elt) \
static inline union sctp_arg	\
SCTP_## name (type arg)		\
{ union sctp_arg retval;\
  retval.zero_all = NULL;\
  retval.elt = arg;\
  return retval;\
}

SCTP_ARG_CONSTRUCTOR(I32,	__s32, i32)
SCTP_ARG_CONSTRUCTOR(U32,	__u32, u32)
SCTP_ARG_CONSTRUCTOR(BE32,	__be32, be32)
SCTP_ARG_CONSTRUCTOR(U16,	__u16, u16)
SCTP_ARG_CONSTRUCTOR(U8,	__u8, u8)
SCTP_ARG_CONSTRUCTOR(ERROR,     int, error)
SCTP_ARG_CONSTRUCTOR(PERR,      __be16, err)	/* protocol error */
SCTP_ARG_CONSTRUCTOR(STATE,	enum sctp_state, state)
SCTP_ARG_CONSTRUCTOR(TO,	enum sctp_event_timeout, to)
SCTP_ARG_CONSTRUCTOR(CHUNK,	struct sctp_chunk *, chunk)
SCTP_ARG_CONSTRUCTOR(ASOC,	struct sctp_association *, asoc)
SCTP_ARG_CONSTRUCTOR(TRANSPORT,	struct sctp_transport *, transport)
SCTP_ARG_CONSTRUCTOR(BA,	struct sctp_bind_addr *, bp)
SCTP_ARG_CONSTRUCTOR(PEER_INIT,	struct sctp_init_chunk *, init)
SCTP_ARG_CONSTRUCTOR(ULPEVENT,  struct sctp_ulpevent *, ulpevent)
SCTP_ARG_CONSTRUCTOR(PACKET,	struct sctp_packet *, packet)
SCTP_ARG_CONSTRUCTOR(SACKH,	struct sctp_sackhdr *, sackh)
SCTP_ARG_CONSTRUCTOR(DATAMSG,	struct sctp_datamsg *, msg)

static inline union sctp_arg SCTP_FORCE(void)
{
	return SCTP_I32(1);
}

static inline union sctp_arg SCTP_NOFORCE(void)
{
	return SCTP_I32(0);
}

static inline union sctp_arg SCTP_NULL(void)
{
	union sctp_arg retval;
	retval.zero_all = NULL;
	return retval;
}

struct sctp_cmd {
	union sctp_arg obj;
	enum sctp_verb verb;
};

struct sctp_cmd_seq {
	struct sctp_cmd cmds[SCTP_MAX_NUM_COMMANDS];
	struct sctp_cmd *last_used_slot;
	struct sctp_cmd *next_cmd;
};


/* Initialize a block of memory as a command sequence.
 * Return 0 if the initialization fails.
 */
static inline int sctp_init_cmd_seq(struct sctp_cmd_seq *seq)
{
	/* cmds[] is filled backwards to simplify the overflow BUG() check */
	seq->last_used_slot = seq->cmds + SCTP_MAX_NUM_COMMANDS;
	seq->next_cmd = seq->last_used_slot;
	return 1;		/* We always succeed.  */
}


/* Add a command to an struct sctp_cmd_seq.
 *
 * Use the SCTP_* constructors defined by SCTP_ARG_CONSTRUCTOR() above
 * to wrap data which goes in the obj argument.
 */
static inline void sctp_add_cmd_sf(struct sctp_cmd_seq *seq,
				   enum sctp_verb verb, union sctp_arg obj)
{
	struct sctp_cmd *cmd = seq->last_used_slot - 1;

	BUG_ON(cmd < seq->cmds);

	cmd->verb = verb;
	cmd->obj = obj;
	seq->last_used_slot = cmd;
}

/* Return the next command structure in an sctp_cmd_seq.
 * Return NULL at the end of the sequence.
 */
static inline struct sctp_cmd *sctp_next_cmd(struct sctp_cmd_seq *seq)
{
	if (seq->next_cmd <= seq->last_used_slot)
		return NULL;

	return --seq->next_cmd;
}

#endif /* __net_sctp_command_h__ */