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1 | /* SCTP kernel reference Implementation |
2 | * (C) Copyright IBM Corp. 2001, 2004 | |
3 | * Copyright (C) 1999-2001 Cisco, Motorola | |
4 | * | |
5 | * This file is part of the SCTP kernel reference Implementation | |
6 | * | |
7 | * These are the definitions needed for the command object. | |
8 | * | |
9 | * The SCTP reference implementation is free software; | |
10 | * you can redistribute it and/or modify it under the terms of | |
11 | * the GNU General Public License as published by | |
12 | * the Free Software Foundation; either version 2, or (at your option) | |
13 | * any later version. | |
14 | * | |
15 | * the SCTP reference implementation is distributed in the hope that it | |
16 | * will be useful, but WITHOUT ANY WARRANTY; without even the implied | |
17 | * ************************ | |
18 | * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. | |
19 | * See the GNU General Public License for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License | |
22 | * along with GNU CC; see the file COPYING. If not, write to | |
23 | * the Free Software Foundation, 59 Temple Place - Suite 330, | |
24 | * Boston, MA 02111-1307, USA. | |
25 | * | |
26 | * Please send any bug reports or fixes you make to one of the | |
27 | * following email addresses: | |
28 | * | |
29 | * La Monte H.P. Yarroll <piggy@acm.org> | |
30 | * Karl Knutson <karl@athena.chicago.il.us> | |
31 | * Ardelle Fan <ardelle.fan@intel.com> | |
32 | * Sridhar Samudrala <sri@us.ibm.com> | |
33 | * | |
34 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
35 | * be incorporated into the next SCTP release. | |
36 | */ | |
37 | ||
38 | ||
39 | #ifndef __net_sctp_command_h__ | |
40 | #define __net_sctp_command_h__ | |
41 | ||
42 | #include <net/sctp/constants.h> | |
43 | #include <net/sctp/structs.h> | |
44 | ||
45 | ||
46 | typedef enum { | |
47 | SCTP_CMD_NOP = 0, /* Do nothing. */ | |
48 | SCTP_CMD_NEW_ASOC, /* Register a new association. */ | |
49 | SCTP_CMD_DELETE_TCB, /* Delete the current association. */ | |
50 | SCTP_CMD_NEW_STATE, /* Enter a new state. */ | |
51 | SCTP_CMD_REPORT_TSN, /* Record the arrival of a TSN. */ | |
52 | SCTP_CMD_GEN_SACK, /* Send a Selective ACK (maybe). */ | |
53 | SCTP_CMD_PROCESS_SACK, /* Process an inbound SACK. */ | |
54 | SCTP_CMD_GEN_INIT_ACK, /* Generate an INIT ACK chunk. */ | |
55 | SCTP_CMD_PEER_INIT, /* Process a INIT from the peer. */ | |
56 | SCTP_CMD_GEN_COOKIE_ECHO, /* Generate a COOKIE ECHO chunk. */ | |
57 | SCTP_CMD_CHUNK_ULP, /* Send a chunk to the sockets layer. */ | |
58 | SCTP_CMD_EVENT_ULP, /* Send a notification to the sockets layer. */ | |
59 | SCTP_CMD_REPLY, /* Send a chunk to our peer. */ | |
60 | SCTP_CMD_SEND_PKT, /* Send a full packet to our peer. */ | |
61 | SCTP_CMD_RETRAN, /* Mark a transport for retransmission. */ | |
62 | SCTP_CMD_ECN_CE, /* Do delayed CE processing. */ | |
63 | SCTP_CMD_ECN_ECNE, /* Do delayed ECNE processing. */ | |
64 | SCTP_CMD_ECN_CWR, /* Do delayed CWR processing. */ | |
65 | SCTP_CMD_TIMER_START, /* Start a timer. */ | |
66 | SCTP_CMD_TIMER_RESTART, /* Restart a timer. */ | |
67 | SCTP_CMD_TIMER_STOP, /* Stop a timer. */ | |
68 | SCTP_CMD_COUNTER_RESET, /* Reset a counter. */ | |
69 | SCTP_CMD_COUNTER_INC, /* Increment a counter. */ | |
70 | SCTP_CMD_INIT_RESTART, /* High level, do init timer work. */ | |
71 | SCTP_CMD_INIT_FAILED, /* High level, do init failure work. */ | |
72 | SCTP_CMD_REPORT_DUP, /* Report a duplicate TSN. */ | |
73 | SCTP_CMD_STRIKE, /* Mark a strike against a transport. */ | |
74 | SCTP_CMD_TRANSMIT, /* Transmit the outqueue. */ | |
75 | SCTP_CMD_HB_TIMERS_START, /* Start the heartbeat timers. */ | |
76 | SCTP_CMD_HB_TIMER_UPDATE, /* Update a heartbeat timers. */ | |
77 | SCTP_CMD_HB_TIMERS_STOP, /* Stop the heartbeat timers. */ | |
78 | SCTP_CMD_TRANSPORT_RESET, /* Reset the status of a transport. */ | |
79 | SCTP_CMD_TRANSPORT_ON, /* Mark the transport as active. */ | |
80 | SCTP_CMD_REPORT_ERROR, /* Pass this error back out of the sm. */ | |
81 | SCTP_CMD_REPORT_BAD_TAG, /* Verification tags didn't match. */ | |
82 | SCTP_CMD_PROCESS_CTSN, /* Sideeffect from shutdown. */ | |
83 | SCTP_CMD_ASSOC_FAILED, /* Handle association failure. */ | |
84 | SCTP_CMD_DISCARD_PACKET, /* Discard the whole packet. */ | |
85 | SCTP_CMD_GEN_SHUTDOWN, /* Generate a SHUTDOWN chunk. */ | |
86 | SCTP_CMD_UPDATE_ASSOC, /* Update association information. */ | |
87 | SCTP_CMD_PURGE_OUTQUEUE, /* Purge all data waiting to be sent. */ | |
88 | SCTP_CMD_SETUP_T2, /* Hi-level, setup T2-shutdown parms. */ | |
89 | SCTP_CMD_RTO_PENDING, /* Set transport's rto_pending. */ | |
90 | SCTP_CMD_PART_DELIVER, /* Partial data delivery considerations. */ | |
91 | SCTP_CMD_RENEGE, /* Renege data on an association. */ | |
92 | SCTP_CMD_SETUP_T4, /* ADDIP, setup T4 RTO timer parms. */ | |
93 | SCTP_CMD_PROCESS_OPERR, /* Process an ERROR chunk. */ | |
94 | SCTP_CMD_REPORT_FWDTSN, /* Report new cumulative TSN Ack. */ | |
95 | SCTP_CMD_PROCESS_FWDTSN, /* Skips were reported, so process further. */ | |
96 | SCTP_CMD_CLEAR_INIT_TAG, /* Clears association peer's inittag. */ | |
97 | SCTP_CMD_DEL_NON_PRIMARY, /* Removes non-primary peer transports. */ | |
98 | SCTP_CMD_T3_RTX_TIMERS_STOP, /* Stops T3-rtx pending timers */ | |
99 | SCTP_CMD_FORCE_PRIM_RETRAN, /* Forces retrans. over primary path. */ | |
100 | SCTP_CMD_LAST | |
101 | } sctp_verb_t; | |
102 | ||
103 | #define SCTP_CMD_MAX (SCTP_CMD_LAST - 1) | |
104 | #define SCTP_CMD_NUM_VERBS (SCTP_CMD_MAX + 1) | |
105 | ||
106 | /* How many commands can you put in an sctp_cmd_seq_t? | |
107 | * This is a rather arbitrary number, ideally derived from a careful | |
108 | * analysis of the state functions, but in reality just taken from | |
109 | * thin air in the hopes othat we don't trigger a kernel panic. | |
110 | */ | |
111 | #define SCTP_MAX_NUM_COMMANDS 14 | |
112 | ||
113 | typedef union { | |
114 | __s32 i32; | |
115 | __u32 u32; | |
116 | __u16 u16; | |
117 | __u8 u8; | |
118 | int error; | |
119 | sctp_state_t state; | |
120 | sctp_event_timeout_t to; | |
121 | sctp_counter_t counter; | |
122 | void *ptr; | |
123 | struct sctp_chunk *chunk; | |
124 | struct sctp_association *asoc; | |
125 | struct sctp_transport *transport; | |
126 | struct sctp_bind_addr *bp; | |
127 | sctp_init_chunk_t *init; | |
128 | struct sctp_ulpevent *ulpevent; | |
129 | struct sctp_packet *packet; | |
130 | sctp_sackhdr_t *sackh; | |
131 | } sctp_arg_t; | |
132 | ||
133 | /* We are simulating ML type constructors here. | |
134 | * | |
135 | * SCTP_ARG_CONSTRUCTOR(NAME, TYPE, ELT) builds a function called | |
136 | * SCTP_NAME() which takes an argument of type TYPE and returns an | |
137 | * sctp_arg_t. It does this by inserting the sole argument into the | |
138 | * ELT union element of a local sctp_arg_t. | |
139 | * | |
140 | * E.g., SCTP_ARG_CONSTRUCTOR(I32, __s32, i32) builds SCTP_I32(arg), | |
141 | * which takes an __s32 and returns a sctp_arg_t containing the | |
142 | * __s32. So, after foo = SCTP_I32(arg), foo.i32 == arg. | |
143 | */ | |
144 | static inline sctp_arg_t SCTP_NULL(void) | |
145 | { | |
146 | sctp_arg_t retval; retval.ptr = NULL; return retval; | |
147 | } | |
148 | static inline sctp_arg_t SCTP_NOFORCE(void) | |
149 | { | |
150 | sctp_arg_t retval; retval.i32 = 0; return retval; | |
151 | } | |
152 | static inline sctp_arg_t SCTP_FORCE(void) | |
153 | { | |
154 | sctp_arg_t retval; retval.i32 = 1; return retval; | |
155 | } | |
156 | ||
157 | #define SCTP_ARG_CONSTRUCTOR(name, type, elt) \ | |
158 | static inline sctp_arg_t \ | |
159 | SCTP_## name (type arg) \ | |
160 | { sctp_arg_t retval; retval.elt = arg; return retval; } | |
161 | ||
162 | SCTP_ARG_CONSTRUCTOR(I32, __s32, i32) | |
163 | SCTP_ARG_CONSTRUCTOR(U32, __u32, u32) | |
164 | SCTP_ARG_CONSTRUCTOR(U16, __u16, u16) | |
165 | SCTP_ARG_CONSTRUCTOR(U8, __u8, u8) | |
166 | SCTP_ARG_CONSTRUCTOR(ERROR, int, error) | |
167 | SCTP_ARG_CONSTRUCTOR(STATE, sctp_state_t, state) | |
168 | SCTP_ARG_CONSTRUCTOR(COUNTER, sctp_counter_t, counter) | |
169 | SCTP_ARG_CONSTRUCTOR(TO, sctp_event_timeout_t, to) | |
170 | SCTP_ARG_CONSTRUCTOR(PTR, void *, ptr) | |
171 | SCTP_ARG_CONSTRUCTOR(CHUNK, struct sctp_chunk *, chunk) | |
172 | SCTP_ARG_CONSTRUCTOR(ASOC, struct sctp_association *, asoc) | |
173 | SCTP_ARG_CONSTRUCTOR(TRANSPORT, struct sctp_transport *, transport) | |
174 | SCTP_ARG_CONSTRUCTOR(BA, struct sctp_bind_addr *, bp) | |
175 | SCTP_ARG_CONSTRUCTOR(PEER_INIT, sctp_init_chunk_t *, init) | |
176 | SCTP_ARG_CONSTRUCTOR(ULPEVENT, struct sctp_ulpevent *, ulpevent) | |
177 | SCTP_ARG_CONSTRUCTOR(PACKET, struct sctp_packet *, packet) | |
178 | SCTP_ARG_CONSTRUCTOR(SACKH, sctp_sackhdr_t *, sackh) | |
179 | ||
180 | typedef struct { | |
181 | sctp_arg_t obj; | |
182 | sctp_verb_t verb; | |
183 | } sctp_cmd_t; | |
184 | ||
185 | typedef struct { | |
186 | sctp_cmd_t cmds[SCTP_MAX_NUM_COMMANDS]; | |
187 | __u8 next_free_slot; | |
188 | __u8 next_cmd; | |
189 | } sctp_cmd_seq_t; | |
190 | ||
191 | ||
192 | /* Initialize a block of memory as a command sequence. | |
193 | * Return 0 if the initialization fails. | |
194 | */ | |
195 | int sctp_init_cmd_seq(sctp_cmd_seq_t *seq); | |
196 | ||
197 | /* Add a command to an sctp_cmd_seq_t. | |
198 | * Return 0 if the command sequence is full. | |
199 | * | |
200 | * Use the SCTP_* constructors defined by SCTP_ARG_CONSTRUCTOR() above | |
201 | * to wrap data which goes in the obj argument. | |
202 | */ | |
203 | int sctp_add_cmd(sctp_cmd_seq_t *seq, sctp_verb_t verb, sctp_arg_t obj); | |
204 | ||
205 | /* Return the next command structure in an sctp_cmd_seq. | |
206 | * Return NULL at the end of the sequence. | |
207 | */ | |
208 | sctp_cmd_t *sctp_next_cmd(sctp_cmd_seq_t *seq); | |
209 | ||
210 | #endif /* __net_sctp_command_h__ */ | |
211 |