450 lines
15 KiB
C
450 lines
15 KiB
C
/* SCTP kernel implementation
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* (C) Copyright IBM Corp. 2001, 2004
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* Copyright (c) 1999-2000 Cisco, Inc.
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* Copyright (c) 1999-2001 Motorola, Inc.
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* Copyright (c) 2001 Intel Corp.
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*
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* This file is part of the SCTP kernel implementation
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*
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* These are definitions needed by the state machine.
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*
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* This SCTP implementation is free software;
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* you can redistribute it and/or modify it under the terms of
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* the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This SCTP implementation is distributed in the hope that it
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* will be useful, but WITHOUT ANY WARRANTY; without even the implied
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* ************************
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* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU CC; see the file COPYING. If not, write to
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* the Free Software Foundation, 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Please send any bug reports or fixes you make to the
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* email addresses:
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* lksctp developers <lksctp-developers@lists.sourceforge.net>
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*
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* Or submit a bug report through the following website:
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* http://www.sf.net/projects/lksctp
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*
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* Written or modified by:
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* La Monte H.P. Yarroll <piggy@acm.org>
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* Karl Knutson <karl@athena.chicago.il.us>
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* Xingang Guo <xingang.guo@intel.com>
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* Jon Grimm <jgrimm@us.ibm.com>
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* Dajiang Zhang <dajiang.zhang@nokia.com>
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* Sridhar Samudrala <sri@us.ibm.com>
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* Daisy Chang <daisyc@us.ibm.com>
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* Ardelle Fan <ardelle.fan@intel.com>
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* Kevin Gao <kevin.gao@intel.com>
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*
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* Any bugs reported given to us we will try to fix... any fixes shared will
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* be incorporated into the next SCTP release.
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*/
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#include <linux/types.h>
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#include <linux/compiler.h>
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#include <linux/slab.h>
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#include <linux/in.h>
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#include <net/sctp/command.h>
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#include <net/sctp/sctp.h>
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#ifndef __sctp_sm_h__
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#define __sctp_sm_h__
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/*
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* Possible values for the disposition are:
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*/
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typedef enum {
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SCTP_DISPOSITION_DISCARD, /* No further processing. */
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SCTP_DISPOSITION_CONSUME, /* Process return values normally. */
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SCTP_DISPOSITION_NOMEM, /* We ran out of memory--recover. */
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SCTP_DISPOSITION_DELETE_TCB, /* Close the association. */
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SCTP_DISPOSITION_ABORT, /* Close the association NOW. */
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SCTP_DISPOSITION_VIOLATION, /* The peer is misbehaving. */
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SCTP_DISPOSITION_NOT_IMPL, /* This entry is not implemented. */
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SCTP_DISPOSITION_ERROR, /* This is plain old user error. */
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SCTP_DISPOSITION_BUG, /* This is a bug. */
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} sctp_disposition_t;
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typedef struct {
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int name;
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int action;
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} sctp_sm_command_t;
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typedef sctp_disposition_t (sctp_state_fn_t) (const struct sctp_endpoint *,
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const struct sctp_association *,
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const sctp_subtype_t type,
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void *arg,
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sctp_cmd_seq_t *);
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typedef void (sctp_timer_event_t) (unsigned long);
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typedef struct {
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sctp_state_fn_t *fn;
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const char *name;
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} sctp_sm_table_entry_t;
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/* A naming convention of "sctp_sf_xxx" applies to all the state functions
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* currently in use.
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*/
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/* Prototypes for generic state functions. */
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sctp_state_fn_t sctp_sf_not_impl;
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sctp_state_fn_t sctp_sf_bug;
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/* Prototypes for gener timer state functions. */
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sctp_state_fn_t sctp_sf_timer_ignore;
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/* Prototypes for chunk state functions. */
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sctp_state_fn_t sctp_sf_do_9_1_abort;
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sctp_state_fn_t sctp_sf_cookie_wait_abort;
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sctp_state_fn_t sctp_sf_cookie_echoed_abort;
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sctp_state_fn_t sctp_sf_shutdown_pending_abort;
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sctp_state_fn_t sctp_sf_shutdown_sent_abort;
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sctp_state_fn_t sctp_sf_shutdown_ack_sent_abort;
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sctp_state_fn_t sctp_sf_do_5_1B_init;
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sctp_state_fn_t sctp_sf_do_5_1C_ack;
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sctp_state_fn_t sctp_sf_do_5_1D_ce;
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sctp_state_fn_t sctp_sf_do_5_1E_ca;
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sctp_state_fn_t sctp_sf_do_4_C;
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sctp_state_fn_t sctp_sf_eat_data_6_2;
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sctp_state_fn_t sctp_sf_eat_data_fast_4_4;
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sctp_state_fn_t sctp_sf_eat_sack_6_2;
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sctp_state_fn_t sctp_sf_operr_notify;
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sctp_state_fn_t sctp_sf_t1_init_timer_expire;
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sctp_state_fn_t sctp_sf_t1_cookie_timer_expire;
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sctp_state_fn_t sctp_sf_t2_timer_expire;
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sctp_state_fn_t sctp_sf_t4_timer_expire;
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sctp_state_fn_t sctp_sf_t5_timer_expire;
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sctp_state_fn_t sctp_sf_sendbeat_8_3;
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sctp_state_fn_t sctp_sf_beat_8_3;
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sctp_state_fn_t sctp_sf_backbeat_8_3;
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sctp_state_fn_t sctp_sf_do_9_2_final;
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sctp_state_fn_t sctp_sf_do_9_2_shutdown;
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sctp_state_fn_t sctp_sf_do_9_2_shut_ctsn;
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sctp_state_fn_t sctp_sf_do_ecn_cwr;
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sctp_state_fn_t sctp_sf_do_ecne;
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sctp_state_fn_t sctp_sf_ootb;
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sctp_state_fn_t sctp_sf_pdiscard;
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sctp_state_fn_t sctp_sf_violation;
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sctp_state_fn_t sctp_sf_discard_chunk;
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sctp_state_fn_t sctp_sf_do_5_2_1_siminit;
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sctp_state_fn_t sctp_sf_do_5_2_2_dupinit;
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sctp_state_fn_t sctp_sf_do_5_2_3_initack;
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sctp_state_fn_t sctp_sf_do_5_2_4_dupcook;
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sctp_state_fn_t sctp_sf_unk_chunk;
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sctp_state_fn_t sctp_sf_do_8_5_1_E_sa;
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sctp_state_fn_t sctp_sf_cookie_echoed_err;
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sctp_state_fn_t sctp_sf_do_asconf;
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sctp_state_fn_t sctp_sf_do_asconf_ack;
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sctp_state_fn_t sctp_sf_do_9_2_reshutack;
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sctp_state_fn_t sctp_sf_eat_fwd_tsn;
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sctp_state_fn_t sctp_sf_eat_fwd_tsn_fast;
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sctp_state_fn_t sctp_sf_eat_auth;
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/* Prototypes for primitive event state functions. */
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sctp_state_fn_t sctp_sf_do_prm_asoc;
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sctp_state_fn_t sctp_sf_do_prm_send;
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sctp_state_fn_t sctp_sf_do_9_2_prm_shutdown;
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sctp_state_fn_t sctp_sf_cookie_wait_prm_shutdown;
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sctp_state_fn_t sctp_sf_cookie_echoed_prm_shutdown;
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sctp_state_fn_t sctp_sf_do_9_1_prm_abort;
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sctp_state_fn_t sctp_sf_cookie_wait_prm_abort;
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sctp_state_fn_t sctp_sf_cookie_echoed_prm_abort;
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sctp_state_fn_t sctp_sf_shutdown_pending_prm_abort;
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sctp_state_fn_t sctp_sf_shutdown_sent_prm_abort;
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sctp_state_fn_t sctp_sf_shutdown_ack_sent_prm_abort;
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sctp_state_fn_t sctp_sf_error_closed;
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sctp_state_fn_t sctp_sf_error_shutdown;
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sctp_state_fn_t sctp_sf_ignore_primitive;
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sctp_state_fn_t sctp_sf_do_prm_requestheartbeat;
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sctp_state_fn_t sctp_sf_do_prm_asconf;
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/* Prototypes for other event state functions. */
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sctp_state_fn_t sctp_sf_do_9_2_start_shutdown;
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sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack;
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sctp_state_fn_t sctp_sf_ignore_other;
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sctp_state_fn_t sctp_sf_cookie_wait_icmp_abort;
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/* Prototypes for timeout event state functions. */
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sctp_state_fn_t sctp_sf_do_6_3_3_rtx;
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sctp_state_fn_t sctp_sf_do_6_2_sack;
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sctp_state_fn_t sctp_sf_autoclose_timer_expire;
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/* Prototypes for utility support functions. */
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__u8 sctp_get_chunk_type(struct sctp_chunk *chunk);
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const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t,
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sctp_state_t,
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sctp_subtype_t);
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int sctp_chunk_iif(const struct sctp_chunk *);
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struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *,
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struct sctp_chunk *,
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gfp_t gfp);
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__u32 sctp_generate_verification_tag(void);
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void sctp_populate_tie_tags(__u8 *cookie, __u32 curTag, __u32 hisTag);
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/* Prototypes for chunk-building functions. */
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struct sctp_chunk *sctp_make_init(const struct sctp_association *,
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const struct sctp_bind_addr *,
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gfp_t gfp, int vparam_len);
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struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *,
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const struct sctp_chunk *,
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const gfp_t gfp,
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const int unkparam_len);
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struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *,
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const struct sctp_chunk *);
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struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *,
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const struct sctp_chunk *);
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struct sctp_chunk *sctp_make_cwr(const struct sctp_association *,
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const __u32 lowest_tsn,
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const struct sctp_chunk *);
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struct sctp_chunk * sctp_make_datafrag_empty(struct sctp_association *,
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const struct sctp_sndrcvinfo *sinfo,
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int len, const __u8 flags,
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__u16 ssn);
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struct sctp_chunk *sctp_make_ecne(const struct sctp_association *,
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const __u32);
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struct sctp_chunk *sctp_make_sack(const struct sctp_association *);
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struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
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const struct sctp_chunk *chunk);
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struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
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const struct sctp_chunk *);
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struct sctp_chunk *sctp_make_shutdown_complete(const struct sctp_association *,
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const struct sctp_chunk *);
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void sctp_init_cause(struct sctp_chunk *, __be16 cause, size_t);
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struct sctp_chunk *sctp_make_abort(const struct sctp_association *,
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const struct sctp_chunk *,
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const size_t hint);
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struct sctp_chunk *sctp_make_abort_no_data(const struct sctp_association *,
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const struct sctp_chunk *,
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__u32 tsn);
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struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *,
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const struct msghdr *, size_t msg_len);
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struct sctp_chunk *sctp_make_abort_violation(const struct sctp_association *,
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const struct sctp_chunk *,
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const __u8 *,
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const size_t );
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struct sctp_chunk *sctp_make_violation_paramlen(const struct sctp_association *,
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const struct sctp_chunk *,
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struct sctp_paramhdr *);
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struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *,
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const struct sctp_transport *,
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const void *payload,
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const size_t paylen);
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struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *,
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const struct sctp_chunk *,
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const void *payload,
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const size_t paylen);
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struct sctp_chunk *sctp_make_op_error(const struct sctp_association *,
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const struct sctp_chunk *chunk,
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__be16 cause_code,
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const void *payload,
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size_t paylen,
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size_t reserve_tail);
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struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *,
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union sctp_addr *,
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struct sockaddr *,
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int, __be16);
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struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
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union sctp_addr *addr);
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int sctp_verify_asconf(const struct sctp_association *asoc,
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struct sctp_paramhdr *param_hdr, void *chunk_end,
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struct sctp_paramhdr **errp);
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struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
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struct sctp_chunk *asconf);
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int sctp_process_asconf_ack(struct sctp_association *asoc,
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struct sctp_chunk *asconf_ack);
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struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
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__u32 new_cum_tsn, size_t nstreams,
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struct sctp_fwdtsn_skip *skiplist);
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struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc);
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void sctp_chunk_assign_tsn(struct sctp_chunk *);
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void sctp_chunk_assign_ssn(struct sctp_chunk *);
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/* Prototypes for statetable processing. */
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int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
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sctp_state_t state,
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struct sctp_endpoint *,
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struct sctp_association *asoc,
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void *event_arg,
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gfp_t gfp);
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/* 2nd level prototypes */
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void sctp_generate_t3_rtx_event(unsigned long peer);
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void sctp_generate_heartbeat_event(unsigned long peer);
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void sctp_generate_proto_unreach_event(unsigned long peer);
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void sctp_ootb_pkt_free(struct sctp_packet *);
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struct sctp_association *sctp_unpack_cookie(const struct sctp_endpoint *,
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const struct sctp_association *,
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struct sctp_chunk *,
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gfp_t gfp, int *err,
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struct sctp_chunk **err_chk_p);
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int sctp_addip_addr_config(struct sctp_association *, sctp_param_t,
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struct sockaddr_storage*, int);
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/* 3rd level prototypes */
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__u32 sctp_generate_tag(const struct sctp_endpoint *);
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__u32 sctp_generate_tsn(const struct sctp_endpoint *);
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/* Extern declarations for major data structures. */
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extern sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES];
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/* Get the size of a DATA chunk payload. */
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static inline __u16 sctp_data_size(struct sctp_chunk *chunk)
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{
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__u16 size;
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size = ntohs(chunk->chunk_hdr->length);
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size -= sizeof(sctp_data_chunk_t);
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return size;
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}
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/* Compare two TSNs */
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/* RFC 1982 - Serial Number Arithmetic
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*
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* 2. Comparison
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* Then, s1 is said to be equal to s2 if and only if i1 is equal to i2,
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* in all other cases, s1 is not equal to s2.
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*
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* s1 is said to be less than s2 if, and only if, s1 is not equal to s2,
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* and
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*
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* (i1 < i2 and i2 - i1 < 2^(SERIAL_BITS - 1)) or
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* (i1 > i2 and i1 - i2 > 2^(SERIAL_BITS - 1))
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*
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* s1 is said to be greater than s2 if, and only if, s1 is not equal to
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* s2, and
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*
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* (i1 < i2 and i2 - i1 > 2^(SERIAL_BITS - 1)) or
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* (i1 > i2 and i1 - i2 < 2^(SERIAL_BITS - 1))
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*/
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/*
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* RFC 2960
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* 1.6 Serial Number Arithmetic
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*
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* Comparisons and arithmetic on TSNs in this document SHOULD use Serial
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* Number Arithmetic as defined in [RFC1982] where SERIAL_BITS = 32.
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*/
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enum {
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TSN_SIGN_BIT = (1<<31)
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};
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static inline int TSN_lt(__u32 s, __u32 t)
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{
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return (((s) - (t)) & TSN_SIGN_BIT);
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}
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static inline int TSN_lte(__u32 s, __u32 t)
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{
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return (((s) == (t)) || (((s) - (t)) & TSN_SIGN_BIT));
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}
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/* Compare two SSNs */
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/*
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* RFC 2960
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* 1.6 Serial Number Arithmetic
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*
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* Comparisons and arithmetic on Stream Sequence Numbers in this document
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* SHOULD use Serial Number Arithmetic as defined in [RFC1982] where
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* SERIAL_BITS = 16.
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*/
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enum {
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SSN_SIGN_BIT = (1<<15)
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};
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static inline int SSN_lt(__u16 s, __u16 t)
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{
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return (((s) - (t)) & SSN_SIGN_BIT);
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}
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static inline int SSN_lte(__u16 s, __u16 t)
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{
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return (((s) == (t)) || (((s) - (t)) & SSN_SIGN_BIT));
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}
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/*
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* ADDIP 3.1.1
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* The valid range of Serial Number is from 0 to 4294967295 (2**32 - 1). Serial
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* Numbers wrap back to 0 after reaching 4294967295.
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*/
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enum {
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ADDIP_SERIAL_SIGN_BIT = (1<<31)
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};
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static inline int ADDIP_SERIAL_gte(__u16 s, __u16 t)
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{
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return (((s) == (t)) || (((t) - (s)) & ADDIP_SERIAL_SIGN_BIT));
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}
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/* Check VTAG of the packet matches the sender's own tag. */
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static inline int
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sctp_vtag_verify(const struct sctp_chunk *chunk,
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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) && asoc->c.peer_vtag &&
|
|
(ntohl(chunk->sctp_hdr->vtag) == asoc->c.peer_vtag))) {
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* __sctp_sm_h__ */
|