include/net/sctp/command.h

   1 /* SCTP kernel 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 implementation
   6  *
   7  * These are the definitions needed for the command object.
   8  *
   9  * This SCTP 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  * This SCTP 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 the
  27  * email address(es):
  28  *    lksctp developers <linux-sctp@vger.kernel.org>
  29  *
  30  * Written or modified by:
  31  *   La Monte H.P. Yarroll <piggy@acm.org>
  32  *   Karl Knutson <karl@athena.chicago.il.us>
  33  *   Ardelle Fan <ardelle.fan@intel.com>
  34  *   Sridhar Samudrala <sri@us.ibm.com>
  35  */
  36
  37 #ifndef __net_sctp_command_h__
  38 #define __net_sctp_command_h__
  39
  40 #include <net/sctp/constants.h>
  41 #include <net/sctp/structs.h>
  42
  43
  44 typedef enum {
  45         SCTP_CMD_NOP = 0,       /* Do nothing. */
  46         SCTP_CMD_NEW_ASOC,      /* Register a new association.  */
  47         SCTP_CMD_DELETE_TCB,    /* Delete the current association. */
  48         SCTP_CMD_NEW_STATE,     /* Enter a new state.  */
  49         SCTP_CMD_REPORT_TSN,    /* Record the arrival of a TSN.  */
  50         SCTP_CMD_GEN_SACK,      /* Send a Selective ACK (maybe).  */
  51         SCTP_CMD_PROCESS_SACK,  /* Process an inbound SACK.  */
  52         SCTP_CMD_GEN_INIT_ACK,  /* Generate an INIT ACK chunk.  */
  53         SCTP_CMD_PEER_INIT,     /* Process a INIT from the peer.  */
  54         SCTP_CMD_GEN_COOKIE_ECHO, /* Generate a COOKIE ECHO chunk. */
  55         SCTP_CMD_CHUNK_ULP,     /* Send a chunk to the sockets layer.  */
  56         SCTP_CMD_EVENT_ULP,     /* Send a notification to the sockets layer. */
  57         SCTP_CMD_REPLY,         /* Send a chunk to our peer.  */
  58         SCTP_CMD_SEND_PKT,      /* Send a full packet to our peer.  */
  59         SCTP_CMD_RETRAN,        /* Mark a transport for retransmission.  */
  60         SCTP_CMD_ECN_CE,        /* Do delayed CE processing.   */
  61         SCTP_CMD_ECN_ECNE,      /* Do delayed ECNE processing. */
  62         SCTP_CMD_ECN_CWR,       /* Do delayed CWR processing.  */
  63         SCTP_CMD_TIMER_START,   /* Start a timer.  */
  64         SCTP_CMD_TIMER_START_ONCE, /* Start a timer once */
  65         SCTP_CMD_TIMER_RESTART, /* Restart a timer. */
  66         SCTP_CMD_TIMER_STOP,    /* Stop a timer. */
  67         SCTP_CMD_INIT_CHOOSE_TRANSPORT, /* Choose transport for an INIT. */
  68         SCTP_CMD_INIT_COUNTER_RESET, /* Reset init counter. */
  69         SCTP_CMD_INIT_COUNTER_INC,   /* Increment init counter. */
  70         SCTP_CMD_INIT_RESTART,  /* High level, do init timer work. */
  71         SCTP_CMD_COOKIEECHO_RESTART,  /* High level, do cookie-echo timer work. */
  72         SCTP_CMD_INIT_FAILED,   /* High level, do init failure work. */
  73         SCTP_CMD_REPORT_DUP,    /* Report a duplicate TSN.  */
  74         SCTP_CMD_STRIKE,        /* Mark a strike against a transport.  */
  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_HB_SENT,  /* Reset the status of a transport. */
  79         SCTP_CMD_TRANSPORT_IDLE,     /* Do manipulations on idle transport */
  80         SCTP_CMD_TRANSPORT_ON,       /* Mark the transport as active. */
  81         SCTP_CMD_REPORT_ERROR,   /* Pass this error back out of the sm. */
  82         SCTP_CMD_REPORT_BAD_TAG, /* Verification tags didn't match. */
  83         SCTP_CMD_PROCESS_CTSN,   /* Sideeffect from shutdown. */
  84         SCTP_CMD_ASSOC_FAILED,   /* Handle association failure. */
  85         SCTP_CMD_DISCARD_PACKET, /* Discard the whole packet. */
  86         SCTP_CMD_GEN_SHUTDOWN,   /* Generate a SHUTDOWN chunk. */
  87         SCTP_CMD_UPDATE_ASSOC,   /* Update association information. */
  88         SCTP_CMD_PURGE_OUTQUEUE, /* Purge all data waiting to be sent. */
  89         SCTP_CMD_SETUP_T2,       /* Hi-level, setup T2-shutdown parms.  */
  90         SCTP_CMD_RTO_PENDING,    /* Set transport's rto_pending. */
  91         SCTP_CMD_PART_DELIVER,   /* Partial data delivery considerations. */
  92         SCTP_CMD_RENEGE,         /* Renege data on an association. */
  93         SCTP_CMD_SETUP_T4,       /* ADDIP, setup T4 RTO timer parms. */
  94         SCTP_CMD_PROCESS_OPERR,  /* Process an ERROR chunk. */
  95         SCTP_CMD_REPORT_FWDTSN,  /* Report new cumulative TSN Ack. */
  96         SCTP_CMD_PROCESS_FWDTSN, /* Skips were reported, so process further. */
  97         SCTP_CMD_CLEAR_INIT_TAG, /* Clears association peer's inittag. */
  98         SCTP_CMD_DEL_NON_PRIMARY, /* Removes non-primary peer transports. */
  99         SCTP_CMD_T3_RTX_TIMERS_STOP, /* Stops T3-rtx pending timers */
 100         SCTP_CMD_FORCE_PRIM_RETRAN,  /* Forces retrans. over primary path. */
 101         SCTP_CMD_SET_SK_ERR,     /* Set sk_err */
 102         SCTP_CMD_ASSOC_CHANGE,   /* generate and send assoc_change event */
 103         SCTP_CMD_ADAPTATION_IND, /* generate and send adaptation event */
 104         SCTP_CMD_ASSOC_SHKEY,    /* generate the association shared keys */
 105         SCTP_CMD_T1_RETRAN,      /* Mark for retransmission after T1 timeout  */
 106         SCTP_CMD_UPDATE_INITTAG, /* Update peer inittag */
 107         SCTP_CMD_SEND_MSG,       /* Send the whole use message */
 108         SCTP_CMD_SEND_NEXT_ASCONF, /* Send the next ASCONF after ACK */
 109         SCTP_CMD_PURGE_ASCONF_QUEUE, /* Purge all asconf queues.*/
 110         SCTP_CMD_SET_ASOC,       /* Restore association context */
 111         SCTP_CMD_LAST
 112 } sctp_verb_t;
 113
 114 /* How many commands can you put in an sctp_cmd_seq_t?
 115  * This is a rather arbitrary number, ideally derived from a careful
 116  * analysis of the state functions, but in reality just taken from
 117  * thin air in the hopes othat we don't trigger a kernel panic.
 118  */
 119 #define SCTP_MAX_NUM_COMMANDS 20
 120
 121 typedef union {
 122         __s32 i32;
 123         __u32 u32;
 124         __be32 be32;
 125         __u16 u16;
 126         __u8 u8;
 127         int error;
 128         __be16 err;
 129         sctp_state_t state;
 130         sctp_event_timeout_t to;
 131         struct sctp_chunk *chunk;
 132         struct sctp_association *asoc;
 133         struct sctp_transport *transport;
 134         struct sctp_bind_addr *bp;
 135         sctp_init_chunk_t *init;
 136         struct sctp_ulpevent *ulpevent;
 137         struct sctp_packet *packet;
 138         sctp_sackhdr_t *sackh;
 139         struct sctp_datamsg *msg;
 140 } sctp_arg_t;
 141
 142 /* We are simulating ML type constructors here.
 143  *
 144  * SCTP_ARG_CONSTRUCTOR(NAME, TYPE, ELT) builds a function called
 145  * SCTP_NAME() which takes an argument of type TYPE and returns an
 146  * sctp_arg_t.  It does this by inserting the sole argument into the
 147  * ELT union element of a local sctp_arg_t.
 148  *
 149  * E.g., SCTP_ARG_CONSTRUCTOR(I32, __s32, i32) builds SCTP_I32(arg),
 150  * which takes an __s32 and returns a sctp_arg_t containing the
 151  * __s32.  So, after foo = SCTP_I32(arg), foo.i32 == arg.
 152  */
 153
 154 #define SCTP_ARG_CONSTRUCTOR(name, type, elt) \
 155 static inline sctp_arg_t        \
 156 SCTP_## name (type arg)         \
 157 { sctp_arg_t retval;\
 158   memset(&retval, 0, sizeof(sctp_arg_t));\
 159   retval.elt = arg;\
 160   return retval;\
 161 }
 162
 163 SCTP_ARG_CONSTRUCTOR(I32,       __s32, i32)
 164 SCTP_ARG_CONSTRUCTOR(U32,       __u32, u32)
 165 SCTP_ARG_CONSTRUCTOR(BE32,      __be32, be32)
 166 SCTP_ARG_CONSTRUCTOR(U16,       __u16, u16)
 167 SCTP_ARG_CONSTRUCTOR(U8,        __u8, u8)
 168 SCTP_ARG_CONSTRUCTOR(ERROR,     int, error)
 169 SCTP_ARG_CONSTRUCTOR(PERR,      __be16, err)    /* protocol error */
 170 SCTP_ARG_CONSTRUCTOR(STATE,     sctp_state_t, state)
 171 SCTP_ARG_CONSTRUCTOR(TO,        sctp_event_timeout_t, to)
 172 SCTP_ARG_CONSTRUCTOR(CHUNK,     struct sctp_chunk *, chunk)
 173 SCTP_ARG_CONSTRUCTOR(ASOC,      struct sctp_association *, asoc)
 174 SCTP_ARG_CONSTRUCTOR(TRANSPORT, struct sctp_transport *, transport)
 175 SCTP_ARG_CONSTRUCTOR(BA,        struct sctp_bind_addr *, bp)
 176 SCTP_ARG_CONSTRUCTOR(PEER_INIT, sctp_init_chunk_t *, init)
 177 SCTP_ARG_CONSTRUCTOR(ULPEVENT,  struct sctp_ulpevent *, ulpevent)
 178 SCTP_ARG_CONSTRUCTOR(PACKET,    struct sctp_packet *, packet)
 179 SCTP_ARG_CONSTRUCTOR(SACKH,     sctp_sackhdr_t *, sackh)
 180 SCTP_ARG_CONSTRUCTOR(DATAMSG,   struct sctp_datamsg *, msg)
 181
 182 static inline sctp_arg_t SCTP_FORCE(void)
 183 {
 184         return SCTP_I32(1);
 185 }
 186
 187 static inline sctp_arg_t SCTP_NOFORCE(void)
 188 {
 189         return SCTP_I32(0);
 190 }
 191
 192 static inline sctp_arg_t SCTP_NULL(void)
 193 {
 194         sctp_arg_t retval;
 195         memset(&retval, 0, sizeof(sctp_arg_t));
 196         return retval;
 197 }
 198
 199 typedef struct {
 200         sctp_arg_t obj;
 201         sctp_verb_t verb;
 202 } sctp_cmd_t;
 203
 204 typedef struct {
 205         sctp_cmd_t cmds[SCTP_MAX_NUM_COMMANDS];
 206         __u8 next_free_slot;
 207         __u8 next_cmd;
 208 } sctp_cmd_seq_t;
 209
 210
 211 /* Initialize a block of memory as a command sequence.
 212  * Return 0 if the initialization fails.
 213  */
 214 int sctp_init_cmd_seq(sctp_cmd_seq_t *seq);
 215
 216 /* Add a command to an sctp_cmd_seq_t.
 217  *
 218  * Use the SCTP_* constructors defined by SCTP_ARG_CONSTRUCTOR() above
 219  * to wrap data which goes in the obj argument.
 220  */
 221 void sctp_add_cmd_sf(sctp_cmd_seq_t *seq, sctp_verb_t verb, sctp_arg_t obj);
 222
 223 /* Return the next command structure in an sctp_cmd_seq.
 224  * Return NULL at the end of the sequence.
 225  */
 226 sctp_cmd_t *sctp_next_cmd(sctp_cmd_seq_t *seq);
 227
 228 #endif /* __net_sctp_command_h__ */
 229