text: /* 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, write to
   * the Free Software Foundation, 59 Temple Place - Suite 330,
   * Boston, MA 02111-1307, USA.
   *
   * Please send any bug reports or fixes you make to one of the
   * following email addresses:
   *
   * 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>
   *
   * Any bugs reported given to us we will try to fix... any fixes shared will
   * be incorporated into the next SCTP release.
   */
  
  
  #ifndef __net_sctp_command_h__
  #define __net_sctp_command_h__
  
  #include <net/sctp/constants.h>
  #include <net/sctp/structs.h>
  
  
  typedef enum {
  	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
  } sctp_verb_t;
  
  /* How many commands can you put in an sctp_cmd_seq_t?
   * 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 14
  
  typedef union {
  	__s32 i32;
  	__u32 u32;
  	__be32 be32;
  	__u16 u16;
  	__u8 u8;
  	int error;
  	__be16 err;
  	sctp_state_t state;
  	sctp_event_timeout_t to;
  	struct sctp_chunk *chunk;
  	struct sctp_association *asoc;
  	struct sctp_transport *transport;
  	struct sctp_bind_addr *bp;
  	sctp_init_chunk_t *init;
  	struct sctp_ulpevent *ulpevent;
  	struct sctp_packet *packet;
  	sctp_sackhdr_t *sackh;
  	struct sctp_datamsg *msg;
  } sctp_arg_t;
  
  /* 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
   * sctp_arg_t.  It does this by inserting the sole argument into the
   * ELT union element of a local sctp_arg_t.
   *
   * E.g., SCTP_ARG_CONSTRUCTOR(I32, __s32, i32) builds SCTP_I32(arg),
   * which takes an __s32 and returns a sctp_arg_t containing the
   * __s32.  So, after foo = SCTP_I32(arg), foo.i32 == arg.
   */
  
  #define SCTP_ARG_CONSTRUCTOR(name, type, elt) \
  static inline sctp_arg_t	\
  SCTP_## name (type arg)		\
  { sctp_arg_t retval;\
    memset(&retval, 0, sizeof(sctp_arg_t));\
    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,	sctp_state_t, state)
  SCTP_ARG_CONSTRUCTOR(TO,	sctp_event_timeout_t, 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,	sctp_init_chunk_t *, init)
  SCTP_ARG_CONSTRUCTOR(ULPEVENT,  struct sctp_ulpevent *, ulpevent)
  SCTP_ARG_CONSTRUCTOR(PACKET,	struct sctp_packet *, packet)
  SCTP_ARG_CONSTRUCTOR(SACKH,	sctp_sackhdr_t *, sackh)
  SCTP_ARG_CONSTRUCTOR(DATAMSG,	struct sctp_datamsg *, msg)
  
  static inline sctp_arg_t SCTP_FORCE(void)
  {
  	return SCTP_I32(1);
  }
  
  static inline sctp_arg_t SCTP_NOFORCE(void)
  {
  	return SCTP_I32(0);
  }
  
  static inline sctp_arg_t SCTP_NULL(void)
  {
  	sctp_arg_t retval;
  	memset(&retval, 0, sizeof(sctp_arg_t));
  	return retval;
  }
  
  typedef struct {
  	sctp_arg_t obj;
  	sctp_verb_t verb;
  } sctp_cmd_t;
  
  typedef struct {
  	sctp_cmd_t cmds[SCTP_MAX_NUM_COMMANDS];
  	__u8 next_free_slot;
  	__u8 next_cmd;
  } sctp_cmd_seq_t;
  
  
  /* Initialize a block of memory as a command sequence.
   * Return 0 if the initialization fails.
   */
  int sctp_init_cmd_seq(sctp_cmd_seq_t *seq);
  
  /* Add a command to an sctp_cmd_seq_t.
   *
   * Use the SCTP_* constructors defined by SCTP_ARG_CONSTRUCTOR() above
   * to wrap data which goes in the obj argument.
   */
  void sctp_add_cmd_sf(sctp_cmd_seq_t *seq, sctp_verb_t verb, sctp_arg_t obj);
  
  /* Return the next command structure in an sctp_cmd_seq.
   * Return NULL at the end of the sequence.
   */
  sctp_cmd_t *sctp_next_cmd(sctp_cmd_seq_t *seq);
  
  #endif /* __net_sctp_command_h__ */
  
  