252 lines
9.2 KiB
C
252 lines
9.2 KiB
C
/* 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_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__ */
|