440 lines
16 KiB
C
Executable file
440 lines
16 KiB
C
Executable file
/* 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, see
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* <http://www.gnu.org/licenses/>.
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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 <linux-sctp@vger.kernel.org>
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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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#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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enum sctp_disposition {
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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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};
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typedef enum sctp_disposition (sctp_state_fn_t) (
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struct net *net,
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const struct sctp_endpoint *ep,
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const struct sctp_association *asoc,
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const union sctp_subtype type,
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void *arg,
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struct sctp_cmd_seq *commands);
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typedef void (sctp_timer_event_t) (struct timer_list *);
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struct sctp_sm_table_entry {
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sctp_state_fn_t *fn;
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const char *name;
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};
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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_reconf;
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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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sctp_state_fn_t sctp_sf_do_prm_reconf;
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/* Prototypes for other event state functions. */
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sctp_state_fn_t sctp_sf_do_no_pending_tsn;
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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_send_reconf;
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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 struct sctp_sm_table_entry *sctp_sm_lookup_event(
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struct net *net,
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enum sctp_event event_type,
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enum sctp_state state,
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union sctp_subtype event_subtype);
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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 *asoc,
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const struct sctp_bind_addr *bp,
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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 *asoc,
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const struct sctp_chunk *chunk,
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const gfp_t gfp, const int unkparam_len);
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struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *asoc,
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const struct sctp_chunk *chunk);
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struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *asoc,
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const struct sctp_chunk *chunk);
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struct sctp_chunk *sctp_make_cwr(const struct sctp_association *asoc,
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const __u32 lowest_tsn,
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const struct sctp_chunk *chunk);
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struct sctp_chunk *sctp_make_idata(const struct sctp_association *asoc,
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__u8 flags, int paylen, gfp_t gfp);
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struct sctp_chunk *sctp_make_ifwdtsn(const struct sctp_association *asoc,
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__u32 new_cum_tsn, size_t nstreams,
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struct sctp_ifwdtsn_skip *skiplist);
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struct sctp_chunk *sctp_make_datafrag_empty(const struct sctp_association *asoc,
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const struct sctp_sndrcvinfo *sinfo,
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int len, __u8 flags, gfp_t gfp);
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struct sctp_chunk *sctp_make_ecne(const struct sctp_association *asoc,
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const __u32 lowest_tsn);
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struct sctp_chunk *sctp_make_sack(struct sctp_association *asoc);
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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 *chunk);
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struct sctp_chunk *sctp_make_shutdown_complete(
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const struct sctp_association *asoc,
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const struct sctp_chunk *chunk);
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int sctp_init_cause(struct sctp_chunk *chunk, __be16 cause, size_t paylen);
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struct sctp_chunk *sctp_make_abort(const struct sctp_association *asoc,
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const struct sctp_chunk *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 *asoc,
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const struct sctp_chunk *chunk,
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__u32 tsn);
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struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *asoc,
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struct msghdr *msg, size_t msg_len);
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struct sctp_chunk *sctp_make_abort_violation(
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const struct sctp_association *asoc,
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const struct sctp_chunk *chunk,
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const __u8 *payload,
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const size_t paylen);
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struct sctp_chunk *sctp_make_violation_paramlen(
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const struct sctp_association *asoc,
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const struct sctp_chunk *chunk,
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struct sctp_paramhdr *param);
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struct sctp_chunk *sctp_make_violation_max_retrans(
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const struct sctp_association *asoc,
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const struct sctp_chunk *chunk);
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struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *asoc,
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const struct sctp_transport *transport);
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struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *asoc,
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const struct sctp_chunk *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 *asoc,
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const struct sctp_chunk *chunk,
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__be16 cause_code, const void *payload,
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size_t paylen, size_t reserve_tail);
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struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *asoc,
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union sctp_addr *laddr,
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struct sockaddr *addrs,
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int addrcnt, __be16 flags);
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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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bool sctp_verify_asconf(const struct sctp_association *asoc,
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struct sctp_chunk *chunk, bool addr_param_needed,
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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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__u16 key_id);
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struct sctp_chunk *sctp_make_strreset_req(const struct sctp_association *asoc,
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__u16 stream_num, __be16 *stream_list,
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bool out, bool in);
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struct sctp_chunk *sctp_make_strreset_tsnreq(
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const struct sctp_association *asoc);
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struct sctp_chunk *sctp_make_strreset_addstrm(
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const struct sctp_association *asoc,
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__u16 out, __u16 in);
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struct sctp_chunk *sctp_make_strreset_resp(const struct sctp_association *asoc,
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__u32 result, __u32 sn);
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struct sctp_chunk *sctp_make_strreset_tsnresp(struct sctp_association *asoc,
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__u32 result, __u32 sn,
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__u32 sender_tsn,
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__u32 receiver_tsn);
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bool sctp_verify_reconf(const struct sctp_association *asoc,
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struct sctp_chunk *chunk,
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struct sctp_paramhdr **errp);
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void sctp_chunk_assign_tsn(struct sctp_chunk *chunk);
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void sctp_chunk_assign_ssn(struct sctp_chunk *chunk);
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/* Prototypes for stream-processing functions. */
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struct sctp_chunk *sctp_process_strreset_outreq(
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struct sctp_association *asoc,
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union sctp_params param,
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struct sctp_ulpevent **evp);
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struct sctp_chunk *sctp_process_strreset_inreq(
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struct sctp_association *asoc,
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union sctp_params param,
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struct sctp_ulpevent **evp);
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struct sctp_chunk *sctp_process_strreset_tsnreq(
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struct sctp_association *asoc,
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union sctp_params param,
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struct sctp_ulpevent **evp);
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struct sctp_chunk *sctp_process_strreset_addstrm_out(
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struct sctp_association *asoc,
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union sctp_params param,
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struct sctp_ulpevent **evp);
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struct sctp_chunk *sctp_process_strreset_addstrm_in(
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struct sctp_association *asoc,
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union sctp_params param,
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struct sctp_ulpevent **evp);
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struct sctp_chunk *sctp_process_strreset_resp(
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struct sctp_association *asoc,
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union sctp_params param,
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struct sctp_ulpevent **evp);
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/* Prototypes for statetable processing. */
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int sctp_do_sm(struct net *net, enum sctp_event event_type,
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union sctp_subtype subtype, enum sctp_state state,
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struct sctp_endpoint *ep, struct sctp_association *asoc,
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void *event_arg, gfp_t gfp);
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/* 2nd level prototypes */
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void sctp_generate_t3_rtx_event(struct timer_list *t);
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void sctp_generate_heartbeat_event(struct timer_list *t);
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void sctp_generate_reconf_event(struct timer_list *t);
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void sctp_generate_proto_unreach_event(struct timer_list *t);
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void sctp_ootb_pkt_free(struct sctp_packet *packet);
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struct sctp_association *sctp_unpack_cookie(
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const struct sctp_endpoint *ep,
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const struct sctp_association *asoc,
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struct sctp_chunk *chunk,
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gfp_t gfp, int *err,
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struct sctp_chunk **err_chk_p);
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/* 3rd level prototypes */
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__u32 sctp_generate_tag(const struct sctp_endpoint *ep);
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__u32 sctp_generate_tsn(const struct sctp_endpoint *ep);
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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 -= sctp_datachk_len(&chunk->asoc->stream);
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return size;
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}
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/* Compare two TSNs */
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#define TSN_lt(a,b) \
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(typecheck(__u32, a) && \
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typecheck(__u32, b) && \
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((__s32)((a) - (b)) < 0))
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#define TSN_lte(a,b) \
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|
(typecheck(__u32, a) && \
|
|
typecheck(__u32, b) && \
|
|
((__s32)((a) - (b)) <= 0))
|
|
|
|
/* Compare two MIDs */
|
|
#define MID_lt(a, b) \
|
|
(typecheck(__u32, a) && \
|
|
typecheck(__u32, b) && \
|
|
((__s32)((a) - (b)) < 0))
|
|
|
|
/* Compare two SSNs */
|
|
#define SSN_lt(a,b) \
|
|
(typecheck(__u16, a) && \
|
|
typecheck(__u16, b) && \
|
|
((__s16)((a) - (b)) < 0))
|
|
|
|
/* ADDIP 3.1.1 */
|
|
#define ADDIP_SERIAL_gte(a,b) \
|
|
(typecheck(__u32, a) && \
|
|
typecheck(__u32, b) && \
|
|
((__s32)((b) - (a)) <= 0))
|
|
|
|
/* 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) && asoc->c.peer_vtag &&
|
|
(ntohl(chunk->sctp_hdr->vtag) == asoc->c.peer_vtag))) {
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif /* __sctp_sm_h__ */
|