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Based on 1 normalized pattern(s): this sctp 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 this sctp 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 see http www gnu org licenses extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 42 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190523091649.683323110@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
425 lines
16 KiB
C
425 lines
16 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/* 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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* 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_type 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_type 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 */
|
|
#define TSN_lt(a,b) \
|
|
(typecheck(__u32, a) && \
|
|
typecheck(__u32, b) && \
|
|
((__s32)((a) - (b)) < 0))
|
|
|
|
#define TSN_lte(a,b) \
|
|
(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__ */
|