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linux/include/net/sctp/sm.h
Al Viro dd0fc66fb3 [PATCH] gfp flags annotations - part 1 
- added typedef unsigned int __nocast gfp_t;

 - replaced __nocast uses for gfp flags with gfp_t - it gives exactly
   the same warnings as far as sparse is concerned, doesn't change
   generated code (from gcc point of view we replaced unsigned int with
   typedef) and documents what's going on far better.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-10-08 15:00:57 -07:00

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/* SCTP kernel reference Implementation
* (C) Copyright IBM Corp. 2001, 2004
* Copyright (c) 1999-2000 Cisco, Inc.
* Copyright (c) 1999-2001 Motorola, Inc.
* Copyright (c) 2001 Intel Corp.
*
* This file is part of the SCTP kernel reference Implementation
*
* These are definitions needed by the state machine.
*
* The SCTP reference 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.
*
* The SCTP reference 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 the
* email addresses:
* lksctp developers <lksctp-developers@lists.sourceforge.net>
*
* Or submit a bug report through the following website:
* http://www.sf.net/projects/lksctp
*
* Written or modified by:
* La Monte H.P. Yarroll <piggy@acm.org>
* Karl Knutson <karl@athena.chicago.il.us>
* Xingang Guo <xingang.guo@intel.com>
* Jon Grimm <jgrimm@us.ibm.com>
* Dajiang Zhang <dajiang.zhang@nokia.com>
* Sridhar Samudrala <sri@us.ibm.com>
* Daisy Chang <daisyc@us.ibm.com>
* Ardelle Fan <ardelle.fan@intel.com>
* Kevin Gao <kevin.gao@intel.com>
*
* Any bugs reported given to us we will try to fix... any fixes shared will
* be incorporated into the next SCTP release.
*/
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/slab.h>
#include <linux/in.h>
#include <net/sctp/command.h>
#include <net/sctp/sctp.h>
#ifndef __sctp_sm_h__
#define __sctp_sm_h__
/*
* Possible values for the disposition are:
*/
typedef enum {
SCTP_DISPOSITION_DISCARD, /* No further processing. */
SCTP_DISPOSITION_CONSUME, /* Process return values normally. */
SCTP_DISPOSITION_NOMEM, /* We ran out of memory--recover. */
SCTP_DISPOSITION_DELETE_TCB, /* Close the association. */
SCTP_DISPOSITION_ABORT, /* Close the association NOW. */
SCTP_DISPOSITION_VIOLATION, /* The peer is misbehaving. */
SCTP_DISPOSITION_NOT_IMPL, /* This entry is not implemented. */
SCTP_DISPOSITION_ERROR, /* This is plain old user error. */
SCTP_DISPOSITION_BUG, /* This is a bug. */
} sctp_disposition_t;
typedef struct {
int name;
int action;
} sctp_sm_command_t;
typedef sctp_disposition_t (sctp_state_fn_t) (const struct sctp_endpoint *,
const struct sctp_association *,
const sctp_subtype_t type,
void *arg,
sctp_cmd_seq_t *);
typedef void (sctp_timer_event_t) (unsigned long);
typedef struct {
sctp_state_fn_t *fn;
const char *name;
} sctp_sm_table_entry_t;
/* A naming convention of "sctp_sf_xxx" applies to all the state functions
* currently in use.
*/
/* Prototypes for generic state functions. */
sctp_state_fn_t sctp_sf_not_impl;
sctp_state_fn_t sctp_sf_bug;
/* Prototypes for gener timer state functions. */
sctp_state_fn_t sctp_sf_timer_ignore;
/* Prototypes for chunk state functions. */
sctp_state_fn_t sctp_sf_do_9_1_abort;
sctp_state_fn_t sctp_sf_cookie_wait_abort;
sctp_state_fn_t sctp_sf_cookie_echoed_abort;
sctp_state_fn_t sctp_sf_shutdown_pending_abort;
sctp_state_fn_t sctp_sf_shutdown_sent_abort;
sctp_state_fn_t sctp_sf_shutdown_ack_sent_abort;
sctp_state_fn_t sctp_sf_do_5_1B_init;
sctp_state_fn_t sctp_sf_do_5_1C_ack;
sctp_state_fn_t sctp_sf_do_5_1D_ce;
sctp_state_fn_t sctp_sf_do_5_1E_ca;
sctp_state_fn_t sctp_sf_do_4_C;
sctp_state_fn_t sctp_sf_eat_data_6_2;
sctp_state_fn_t sctp_sf_eat_data_fast_4_4;
sctp_state_fn_t sctp_sf_eat_sack_6_2;
sctp_state_fn_t sctp_sf_tabort_8_4_8;
sctp_state_fn_t sctp_sf_operr_notify;
sctp_state_fn_t sctp_sf_t1_init_timer_expire;
sctp_state_fn_t sctp_sf_t1_cookie_timer_expire;
sctp_state_fn_t sctp_sf_t2_timer_expire;
sctp_state_fn_t sctp_sf_t4_timer_expire;
sctp_state_fn_t sctp_sf_t5_timer_expire;
sctp_state_fn_t sctp_sf_sendbeat_8_3;
sctp_state_fn_t sctp_sf_beat_8_3;
sctp_state_fn_t sctp_sf_backbeat_8_3;
sctp_state_fn_t sctp_sf_do_9_2_final;
sctp_state_fn_t sctp_sf_do_9_2_shutdown;
sctp_state_fn_t sctp_sf_do_ecn_cwr;
sctp_state_fn_t sctp_sf_do_ecne;
sctp_state_fn_t sctp_sf_ootb;
sctp_state_fn_t sctp_sf_pdiscard;
sctp_state_fn_t sctp_sf_violation;
sctp_state_fn_t sctp_sf_discard_chunk;
sctp_state_fn_t sctp_sf_do_5_2_1_siminit;
sctp_state_fn_t sctp_sf_do_5_2_2_dupinit;
sctp_state_fn_t sctp_sf_do_5_2_4_dupcook;
sctp_state_fn_t sctp_sf_unk_chunk;
sctp_state_fn_t sctp_sf_do_8_5_1_E_sa;
sctp_state_fn_t sctp_sf_cookie_echoed_err;
sctp_state_fn_t sctp_sf_do_asconf;
sctp_state_fn_t sctp_sf_do_asconf_ack;
sctp_state_fn_t sctp_sf_do_9_2_reshutack;
sctp_state_fn_t sctp_sf_eat_fwd_tsn;
sctp_state_fn_t sctp_sf_eat_fwd_tsn_fast;
/* Prototypes for primitive event state functions. */
sctp_state_fn_t sctp_sf_do_prm_asoc;
sctp_state_fn_t sctp_sf_do_prm_send;
sctp_state_fn_t sctp_sf_do_9_2_prm_shutdown;
sctp_state_fn_t sctp_sf_cookie_wait_prm_shutdown;
sctp_state_fn_t sctp_sf_cookie_echoed_prm_shutdown;
sctp_state_fn_t sctp_sf_do_9_1_prm_abort;
sctp_state_fn_t sctp_sf_cookie_wait_prm_abort;
sctp_state_fn_t sctp_sf_cookie_echoed_prm_abort;
sctp_state_fn_t sctp_sf_shutdown_pending_prm_abort;
sctp_state_fn_t sctp_sf_shutdown_sent_prm_abort;
sctp_state_fn_t sctp_sf_shutdown_ack_sent_prm_abort;
sctp_state_fn_t sctp_sf_error_closed;
sctp_state_fn_t sctp_sf_error_shutdown;
sctp_state_fn_t sctp_sf_ignore_primitive;
sctp_state_fn_t sctp_sf_do_prm_requestheartbeat;
sctp_state_fn_t sctp_sf_do_prm_asconf;
/* Prototypes for other event state functions. */
sctp_state_fn_t sctp_sf_do_9_2_start_shutdown;
sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack;
sctp_state_fn_t sctp_sf_ignore_other;
sctp_state_fn_t sctp_sf_cookie_wait_icmp_abort;
/* Prototypes for timeout event state functions. */
sctp_state_fn_t sctp_sf_do_6_3_3_rtx;
sctp_state_fn_t sctp_sf_do_6_2_sack;
sctp_state_fn_t sctp_sf_autoclose_timer_expire;
/* Prototypes for utility support functions. */
__u8 sctp_get_chunk_type(struct sctp_chunk *chunk);
const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t,
sctp_state_t,
sctp_subtype_t);
int sctp_chunk_iif(const struct sctp_chunk *);
struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *,
struct sctp_chunk *,
gfp_t gfp);
__u32 sctp_generate_verification_tag(void);
void sctp_populate_tie_tags(__u8 *cookie, __u32 curTag, __u32 hisTag);
/* Prototypes for chunk-building functions. */
struct sctp_chunk *sctp_make_init(const struct sctp_association *,
const struct sctp_bind_addr *,
gfp_t gfp, int vparam_len);
struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *,
const struct sctp_chunk *,
const gfp_t gfp,
const int unkparam_len);
struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *,
const struct sctp_chunk *);
struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *,
const struct sctp_chunk *);
struct sctp_chunk *sctp_make_cwr(const struct sctp_association *,
const __u32 lowest_tsn,
const struct sctp_chunk *);
struct sctp_chunk * sctp_make_datafrag_empty(struct sctp_association *,
const struct sctp_sndrcvinfo *sinfo,
int len, const __u8 flags,
__u16 ssn);
struct sctp_chunk *sctp_make_ecne(const struct sctp_association *,
const __u32);
struct sctp_chunk *sctp_make_sack(const struct sctp_association *);
struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
const struct sctp_chunk *chunk);
struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
const struct sctp_chunk *);
struct sctp_chunk *sctp_make_shutdown_complete(const struct sctp_association *,
const struct sctp_chunk *);
void sctp_init_cause(struct sctp_chunk *, __u16 cause, const void *, size_t);
struct sctp_chunk *sctp_make_abort(const struct sctp_association *,
const struct sctp_chunk *,
const size_t hint);
struct sctp_chunk *sctp_make_abort_no_data(const struct sctp_association *,
const struct sctp_chunk *,
__u32 tsn);
struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *,
const struct sctp_chunk *,
const struct msghdr *);
struct sctp_chunk *sctp_make_abort_violation(const struct sctp_association *,
const struct sctp_chunk *,
const __u8 *,
const size_t );
struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *,
const struct sctp_transport *,
const void *payload,
const size_t paylen);
struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *,
const struct sctp_chunk *,
const void *payload,
const size_t paylen);
struct sctp_chunk *sctp_make_op_error(const struct sctp_association *,
const struct sctp_chunk *chunk,
__u16 cause_code,
const void *payload,
size_t paylen);
struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *,
union sctp_addr *,
struct sockaddr *,
int, __u16);
struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
union sctp_addr *addr);
struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
struct sctp_chunk *asconf);
int sctp_process_asconf_ack(struct sctp_association *asoc,
struct sctp_chunk *asconf_ack);
struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
__u32 new_cum_tsn, size_t nstreams,
struct sctp_fwdtsn_skip *skiplist);
void sctp_chunk_assign_tsn(struct sctp_chunk *);
void sctp_chunk_assign_ssn(struct sctp_chunk *);
/* Prototypes for statetable processing. */
int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
sctp_state_t state,
struct sctp_endpoint *,
struct sctp_association *asoc,
void *event_arg,
gfp_t gfp);
/* 2nd level prototypes */
void sctp_generate_t3_rtx_event(unsigned long peer);
void sctp_generate_heartbeat_event(unsigned long peer);
void sctp_ootb_pkt_free(struct sctp_packet *);
struct sctp_association *sctp_unpack_cookie(const struct sctp_endpoint *,
const struct sctp_association *,
struct sctp_chunk *,
gfp_t gfp, int *err,
struct sctp_chunk **err_chk_p);
int sctp_addip_addr_config(struct sctp_association *, sctp_param_t,
struct sockaddr_storage*, int);
/* 3rd level prototypes */
__u32 sctp_generate_tag(const struct sctp_endpoint *);
__u32 sctp_generate_tsn(const struct sctp_endpoint *);
/* Extern declarations for major data structures. */
extern sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES];
/* Get the size of a DATA chunk payload. */
static inline __u16 sctp_data_size(struct sctp_chunk *chunk)
{
__u16 size;
size = ntohs(chunk->chunk_hdr->length);
size -= sizeof(sctp_data_chunk_t);
return size;
}
/* Compare two TSNs */
/* RFC 1982 - Serial Number Arithmetic
*
* 2. Comparison
* Then, s1 is said to be equal to s2 if and only if i1 is equal to i2,
* in all other cases, s1 is not equal to s2.
*
* s1 is said to be less than s2 if, and only if, s1 is not equal to s2,
* and
*
* (i1 < i2 and i2 - i1 < 2^(SERIAL_BITS - 1)) or
* (i1 > i2 and i1 - i2 > 2^(SERIAL_BITS - 1))
*
* s1 is said to be greater than s2 if, and only if, s1 is not equal to
* s2, and
*
* (i1 < i2 and i2 - i1 > 2^(SERIAL_BITS - 1)) or
* (i1 > i2 and i1 - i2 < 2^(SERIAL_BITS - 1))
*/
/*
* RFC 2960
* 1.6 Serial Number Arithmetic
*
* Comparisons and arithmetic on TSNs in this document SHOULD use Serial
* Number Arithmetic as defined in [RFC1982] where SERIAL_BITS = 32.
*/
enum {
TSN_SIGN_BIT = (1<<31)
};
static inline int TSN_lt(__u32 s, __u32 t)
{
return (((s) - (t)) & TSN_SIGN_BIT);
}
static inline int TSN_lte(__u32 s, __u32 t)
{
return (((s) == (t)) || (((s) - (t)) & TSN_SIGN_BIT));
}
/* Compare two SSNs */
/*
* RFC 2960
* 1.6 Serial Number Arithmetic
*
* Comparisons and arithmetic on Stream Sequence Numbers in this document
* SHOULD use Serial Number Arithmetic as defined in [RFC1982] where
* SERIAL_BITS = 16.
*/
enum {
SSN_SIGN_BIT = (1<<15)
};
static inline int SSN_lt(__u16 s, __u16 t)
{
return (((s) - (t)) & SSN_SIGN_BIT);
}
static inline int SSN_lte(__u16 s, __u16 t)
{
return (((s) == (t)) || (((s) - (t)) & SSN_SIGN_BIT));
}
/*
* ADDIP 3.1.1
* The valid range of Serial Number is from 0 to 4294967295 (2**32 - 1). Serial
* Numbers wrap back to 0 after reaching 4294967295.
*/
enum {
ADDIP_SERIAL_SIGN_BIT = (1<<31)
};
static inline int ADDIP_SERIAL_gte(__u16 s, __u16 t)
{
return (((s) == (t)) || (((t) - (s)) & ADDIP_SERIAL_SIGN_BIT));
}
/* Run sctp_add_cmd() generating a BUG() if there is a failure. */
static inline void sctp_add_cmd_sf(sctp_cmd_seq_t *seq, sctp_verb_t verb, sctp_arg_t obj)
{
if (unlikely(!sctp_add_cmd(seq, verb, obj)))
BUG();
}
/* Check VTAG of the packet matches the sender's own tag. */
static inline int
sctp_vtag_verify(const struct sctp_chunk *chunk,
const struct sctp_association *asoc)
{
/* RFC 2960 Sec 8.5 When receiving an SCTP packet, the endpoint
* MUST ensure that the value in the Verification Tag field of
* the received SCTP packet matches its own Tag. If the received
* Verification Tag value does not match the receiver's own
* tag value, the receiver shall silently discard the packet...
*/
if (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)
return 1;
return 0;
}
/* Check VTAG of the packet matches the sender's own tag and the T bit is
* not set, OR its peer's tag and the T bit is set in the Chunk Flags.
*/
static inline int
sctp_vtag_verify_either(const struct sctp_chunk *chunk,
const struct sctp_association *asoc)
{
/* RFC 2960 Section 8.5.1, sctpimpguide Section 2.41
*
* B) The receiver of a ABORT MUST accept the packet
* if the Verification Tag field of the packet matches its own tag
* and the T bit is not set
* OR
* it is set to its peer's tag and the T bit is set in the Chunk
* Flags.
* Otherwise, the receiver MUST silently discard the packet
* and take no further action.
*
* C) The receiver of a SHUTDOWN COMPLETE shall accept the packet
* if the Verification Tag field of the packet matches its own tag
* and the T bit is not set
* OR
* it is set to its peer's tag and the T bit is set in the Chunk
* Flags.
* Otherwise, the receiver MUST silently discard the packet
* and take no further action. An endpoint MUST ignore the
* SHUTDOWN COMPLETE if it is not in the SHUTDOWN-ACK-SENT state.
*/
if ((!sctp_test_T_bit(chunk) &&
(ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)) ||
(sctp_test_T_bit(chunk) &&
(ntohl(chunk->sctp_hdr->vtag) == asoc->c.peer_vtag))) {
return 1;
}
return 0;
}
#endif /* __sctp_sm_h__ */
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