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Diffstat (limited to 'include/net/sctp/command.h')
| -rw-r--r-- | include/net/sctp/command.h | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/include/net/sctp/command.h b/include/net/sctp/command.h new file mode 100644 index 000000000..e8df72e16 --- /dev/null +++ b/include/net/sctp/command.h @@ -0,0 +1,236 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* 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. + * + * 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_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__ */ |