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+/* SCTP kernel reference Implementation
+ * (C) Copyright IBM Corp. 2001, 2004
+ * Copyright (c) 1999-2000 Cisco, Inc.
+ * Copyright (c) 1999-2001 Motorola, Inc.
+ * Copyright (c) 2001 Intel Corp.
+ *
+ * This file is part of the SCTP kernel reference Implementation
+ *
+ * These are definitions needed by the state machine.
+ *
+ * The SCTP reference implementation is free software;
+ * you can redistribute it and/or modify it under the terms of
+ * the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * The SCTP reference implementation is distributed in the hope that it
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * ************************
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU CC; see the file COPYING. If not, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email addresses:
+ * lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ * http://www.sf.net/projects/lksctp
+ *
+ * Written or modified by:
+ * La Monte H.P. Yarroll <piggy@acm.org>
+ * Karl Knutson <karl@athena.chicago.il.us>
+ * Xingang Guo <xingang.guo@intel.com>
+ * Jon Grimm <jgrimm@us.ibm.com>
+ * Dajiang Zhang <dajiang.zhang@nokia.com>
+ * Sridhar Samudrala <sri@us.ibm.com>
+ * Daisy Chang <daisyc@us.ibm.com>
+ * Ardelle Fan <ardelle.fan@intel.com>
+ * Kevin Gao <kevin.gao@intel.com>
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#include <linux/types.h>
+#include <linux/compiler.h>
+#include <linux/slab.h>
+#include <linux/in.h>
+#include <net/sctp/command.h>
+#include <net/sctp/sctp.h>
+
+#ifndef __sctp_sm_h__
+#define __sctp_sm_h__
+
+/*
+ * Possible values for the disposition are:
+ */
+typedef enum {
+ SCTP_DISPOSITION_DISCARD, /* No further processing. */
+ SCTP_DISPOSITION_CONSUME, /* Process return values normally. */
+ SCTP_DISPOSITION_NOMEM, /* We ran out of memory--recover. */
+ SCTP_DISPOSITION_DELETE_TCB, /* Close the association. */
+ SCTP_DISPOSITION_ABORT, /* Close the association NOW. */
+ SCTP_DISPOSITION_VIOLATION, /* The peer is misbehaving. */
+ SCTP_DISPOSITION_NOT_IMPL, /* This entry is not implemented. */
+ SCTP_DISPOSITION_ERROR, /* This is plain old user error. */
+ SCTP_DISPOSITION_BUG, /* This is a bug. */
+} sctp_disposition_t;
+
+typedef struct {
+ int name;
+ int action;
+} sctp_sm_command_t;
+
+typedef sctp_disposition_t (sctp_state_fn_t) (const struct sctp_endpoint *,
+ const struct sctp_association *,
+ const sctp_subtype_t type,
+ void *arg,
+ sctp_cmd_seq_t *);
+typedef void (sctp_timer_event_t) (unsigned long);
+typedef struct {
+ sctp_state_fn_t *fn;
+ const char *name;
+} sctp_sm_table_entry_t;
+
+/* A naming convention of "sctp_sf_xxx" applies to all the state functions
+ * currently in use.
+ */
+
+/* Prototypes for generic state functions. */
+sctp_state_fn_t sctp_sf_not_impl;
+sctp_state_fn_t sctp_sf_bug;
+
+/* Prototypes for gener timer state functions. */
+sctp_state_fn_t sctp_sf_timer_ignore;
+
+/* Prototypes for chunk state functions. */
+sctp_state_fn_t sctp_sf_do_9_1_abort;
+sctp_state_fn_t sctp_sf_cookie_wait_abort;
+sctp_state_fn_t sctp_sf_cookie_echoed_abort;
+sctp_state_fn_t sctp_sf_shutdown_pending_abort;
+sctp_state_fn_t sctp_sf_shutdown_sent_abort;
+sctp_state_fn_t sctp_sf_shutdown_ack_sent_abort;
+sctp_state_fn_t sctp_sf_do_5_1B_init;
+sctp_state_fn_t sctp_sf_do_5_1C_ack;
+sctp_state_fn_t sctp_sf_do_5_1D_ce;
+sctp_state_fn_t sctp_sf_do_5_1E_ca;
+sctp_state_fn_t sctp_sf_do_4_C;
+sctp_state_fn_t sctp_sf_eat_data_6_2;
+sctp_state_fn_t sctp_sf_eat_data_fast_4_4;
+sctp_state_fn_t sctp_sf_eat_sack_6_2;
+sctp_state_fn_t sctp_sf_tabort_8_4_8;
+sctp_state_fn_t sctp_sf_operr_notify;
+sctp_state_fn_t sctp_sf_t1_timer_expire;
+sctp_state_fn_t sctp_sf_t2_timer_expire;
+sctp_state_fn_t sctp_sf_t4_timer_expire;
+sctp_state_fn_t sctp_sf_t5_timer_expire;
+sctp_state_fn_t sctp_sf_sendbeat_8_3;
+sctp_state_fn_t sctp_sf_beat_8_3;
+sctp_state_fn_t sctp_sf_backbeat_8_3;
+sctp_state_fn_t sctp_sf_do_9_2_final;
+sctp_state_fn_t sctp_sf_do_9_2_shutdown;
+sctp_state_fn_t sctp_sf_do_ecn_cwr;
+sctp_state_fn_t sctp_sf_do_ecne;
+sctp_state_fn_t sctp_sf_ootb;
+sctp_state_fn_t sctp_sf_pdiscard;
+sctp_state_fn_t sctp_sf_violation;
+sctp_state_fn_t sctp_sf_violation_chunklen;
+sctp_state_fn_t sctp_sf_discard_chunk;
+sctp_state_fn_t sctp_sf_do_5_2_1_siminit;
+sctp_state_fn_t sctp_sf_do_5_2_2_dupinit;
+sctp_state_fn_t sctp_sf_do_5_2_4_dupcook;
+sctp_state_fn_t sctp_sf_unk_chunk;
+sctp_state_fn_t sctp_sf_do_8_5_1_E_sa;
+sctp_state_fn_t sctp_sf_cookie_echoed_err;
+sctp_state_fn_t sctp_sf_do_asconf;
+sctp_state_fn_t sctp_sf_do_asconf_ack;
+sctp_state_fn_t sctp_sf_do_9_2_reshutack;
+sctp_state_fn_t sctp_sf_eat_fwd_tsn;
+sctp_state_fn_t sctp_sf_eat_fwd_tsn_fast;
+
+/* Prototypes for primitive event state functions. */
+sctp_state_fn_t sctp_sf_do_prm_asoc;
+sctp_state_fn_t sctp_sf_do_prm_send;
+sctp_state_fn_t sctp_sf_do_9_2_prm_shutdown;
+sctp_state_fn_t sctp_sf_cookie_wait_prm_shutdown;
+sctp_state_fn_t sctp_sf_cookie_echoed_prm_shutdown;
+sctp_state_fn_t sctp_sf_do_9_1_prm_abort;
+sctp_state_fn_t sctp_sf_cookie_wait_prm_abort;
+sctp_state_fn_t sctp_sf_cookie_echoed_prm_abort;
+sctp_state_fn_t sctp_sf_shutdown_pending_prm_abort;
+sctp_state_fn_t sctp_sf_shutdown_sent_prm_abort;
+sctp_state_fn_t sctp_sf_shutdown_ack_sent_prm_abort;
+sctp_state_fn_t sctp_sf_error_closed;
+sctp_state_fn_t sctp_sf_error_shutdown;
+sctp_state_fn_t sctp_sf_ignore_primitive;
+sctp_state_fn_t sctp_sf_do_prm_requestheartbeat;
+sctp_state_fn_t sctp_sf_do_prm_asconf;
+
+/* Prototypes for other event state functions. */
+sctp_state_fn_t sctp_sf_do_9_2_start_shutdown;
+sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack;
+sctp_state_fn_t sctp_sf_ignore_other;
+sctp_state_fn_t sctp_sf_cookie_wait_icmp_abort;
+
+/* Prototypes for timeout event state functions. */
+sctp_state_fn_t sctp_sf_do_6_3_3_rtx;
+sctp_state_fn_t sctp_sf_do_6_2_sack;
+sctp_state_fn_t sctp_sf_autoclose_timer_expire;
+
+/* Prototypes for utility support functions. */
+__u8 sctp_get_chunk_type(struct sctp_chunk *chunk);
+const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t,
+ sctp_state_t,
+ sctp_subtype_t);
+int sctp_chunk_iif(const struct sctp_chunk *);
+struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *,
+ struct sctp_chunk *,
+ int gfp);
+__u32 sctp_generate_verification_tag(void);
+void sctp_populate_tie_tags(__u8 *cookie, __u32 curTag, __u32 hisTag);
+
+/* Prototypes for chunk-building functions. */
+struct sctp_chunk *sctp_make_init(const struct sctp_association *,
+ const struct sctp_bind_addr *,
+ int gfp, int vparam_len);
+struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *,
+ const struct sctp_chunk *,
+ const int gfp,
+ const int unkparam_len);
+struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *,
+ const struct sctp_chunk *);
+struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *,
+ const struct sctp_chunk *);
+struct sctp_chunk *sctp_make_cwr(const struct sctp_association *,
+ const __u32 lowest_tsn,
+ const struct sctp_chunk *);
+struct sctp_chunk * sctp_make_datafrag_empty(struct sctp_association *,
+ const struct sctp_sndrcvinfo *sinfo,
+ int len, const __u8 flags,
+ __u16 ssn);
+struct sctp_chunk *sctp_make_ecne(const struct sctp_association *,
+ const __u32);
+struct sctp_chunk *sctp_make_sack(const struct sctp_association *);
+struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc,
+ const struct sctp_chunk *chunk);
+struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc,
+ const struct sctp_chunk *);
+struct sctp_chunk *sctp_make_shutdown_complete(const struct sctp_association *,
+ const struct sctp_chunk *);
+void sctp_init_cause(struct sctp_chunk *, __u16 cause, const void *, size_t);
+struct sctp_chunk *sctp_make_abort(const struct sctp_association *,
+ const struct sctp_chunk *,
+ const size_t hint);
+struct sctp_chunk *sctp_make_abort_no_data(const struct sctp_association *,
+ const struct sctp_chunk *,
+ __u32 tsn);
+struct sctp_chunk *sctp_make_abort_user(const struct sctp_association *,
+ const struct sctp_chunk *,
+ const struct msghdr *);
+struct sctp_chunk *sctp_make_abort_violation(const struct sctp_association *,
+ const struct sctp_chunk *,
+ const __u8 *,
+ const size_t );
+struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *,
+ const struct sctp_transport *,
+ const void *payload,
+ const size_t paylen);
+struct sctp_chunk *sctp_make_heartbeat_ack(const struct sctp_association *,
+ const struct sctp_chunk *,
+ const void *payload,
+ const size_t paylen);
+struct sctp_chunk *sctp_make_op_error(const struct sctp_association *,
+ const struct sctp_chunk *chunk,
+ __u16 cause_code,
+ const void *payload,
+ size_t paylen);
+
+struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *,
+ union sctp_addr *,
+ struct sockaddr *,
+ int, __u16);
+struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc,
+ union sctp_addr *addr);
+struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc,
+ struct sctp_chunk *asconf);
+int sctp_process_asconf_ack(struct sctp_association *asoc,
+ struct sctp_chunk *asconf_ack);
+struct sctp_chunk *sctp_make_fwdtsn(const struct sctp_association *asoc,
+ __u32 new_cum_tsn, size_t nstreams,
+ struct sctp_fwdtsn_skip *skiplist);
+
+void sctp_chunk_assign_tsn(struct sctp_chunk *);
+void sctp_chunk_assign_ssn(struct sctp_chunk *);
+
+void sctp_stop_t1_and_abort(sctp_cmd_seq_t *commands, __u16 error);
+
+/* Prototypes for statetable processing. */
+
+int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype,
+ sctp_state_t state,
+ struct sctp_endpoint *,
+ struct sctp_association *asoc,
+ void *event_arg,
+ int gfp);
+
+/* 2nd level prototypes */
+void sctp_generate_t3_rtx_event(unsigned long peer);
+void sctp_generate_heartbeat_event(unsigned long peer);
+
+void sctp_ootb_pkt_free(struct sctp_packet *);
+
+struct sctp_association *sctp_unpack_cookie(const struct sctp_endpoint *,
+ const struct sctp_association *,
+ struct sctp_chunk *, int gfp, int *err,
+ struct sctp_chunk **err_chk_p);
+int sctp_addip_addr_config(struct sctp_association *, sctp_param_t,
+ struct sockaddr_storage*, int);
+
+/* 3rd level prototypes */
+__u32 sctp_generate_tag(const struct sctp_endpoint *);
+__u32 sctp_generate_tsn(const struct sctp_endpoint *);
+
+/* Extern declarations for major data structures. */
+extern sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES];
+
+
+/* Get the size of a DATA chunk payload. */
+static inline __u16 sctp_data_size(struct sctp_chunk *chunk)
+{
+ __u16 size;
+
+ size = ntohs(chunk->chunk_hdr->length);
+ size -= sizeof(sctp_data_chunk_t);
+
+ return size;
+}
+
+/* Compare two TSNs */
+
+/* RFC 1982 - Serial Number Arithmetic
+ *
+ * 2. Comparison
+ * Then, s1 is said to be equal to s2 if and only if i1 is equal to i2,
+ * in all other cases, s1 is not equal to s2.
+ *
+ * s1 is said to be less than s2 if, and only if, s1 is not equal to s2,
+ * and
+ *
+ * (i1 < i2 and i2 - i1 < 2^(SERIAL_BITS - 1)) or
+ * (i1 > i2 and i1 - i2 > 2^(SERIAL_BITS - 1))
+ *
+ * s1 is said to be greater than s2 if, and only if, s1 is not equal to
+ * s2, and
+ *
+ * (i1 < i2 and i2 - i1 > 2^(SERIAL_BITS - 1)) or
+ * (i1 > i2 and i1 - i2 < 2^(SERIAL_BITS - 1))
+ */
+
+/*
+ * RFC 2960
+ * 1.6 Serial Number Arithmetic
+ *
+ * Comparisons and arithmetic on TSNs in this document SHOULD use Serial
+ * Number Arithmetic as defined in [RFC1982] where SERIAL_BITS = 32.
+ */
+
+enum {
+ TSN_SIGN_BIT = (1<<31)
+};
+
+static inline int TSN_lt(__u32 s, __u32 t)
+{
+ return (((s) - (t)) & TSN_SIGN_BIT);
+}
+
+static inline int TSN_lte(__u32 s, __u32 t)
+{
+ return (((s) == (t)) || (((s) - (t)) & TSN_SIGN_BIT));
+}
+
+/* Compare two SSNs */
+
+/*
+ * RFC 2960
+ * 1.6 Serial Number Arithmetic
+ *
+ * Comparisons and arithmetic on Stream Sequence Numbers in this document
+ * SHOULD use Serial Number Arithmetic as defined in [RFC1982] where
+ * SERIAL_BITS = 16.
+ */
+enum {
+ SSN_SIGN_BIT = (1<<15)
+};
+
+static inline int SSN_lt(__u16 s, __u16 t)
+{
+ return (((s) - (t)) & SSN_SIGN_BIT);
+}
+
+static inline int SSN_lte(__u16 s, __u16 t)
+{
+ return (((s) == (t)) || (((s) - (t)) & SSN_SIGN_BIT));
+}
+
+/*
+ * ADDIP 3.1.1
+ * The valid range of Serial Number is from 0 to 4294967295 (2**32 - 1). Serial
+ * Numbers wrap back to 0 after reaching 4294967295.
+ */
+enum {
+ ADDIP_SERIAL_SIGN_BIT = (1<<31)
+};
+
+static inline int ADDIP_SERIAL_gte(__u16 s, __u16 t)
+{
+ return (((s) == (t)) || (((t) - (s)) & ADDIP_SERIAL_SIGN_BIT));
+}
+
+
+/* Run sctp_add_cmd() generating a BUG() if there is a failure. */
+static inline void sctp_add_cmd_sf(sctp_cmd_seq_t *seq, sctp_verb_t verb, sctp_arg_t obj)
+{
+ if (unlikely(!sctp_add_cmd(seq, verb, obj)))
+ BUG();
+}
+
+/* Check VTAG of the packet matches the sender's own tag. */
+static inline int
+sctp_vtag_verify(const struct sctp_chunk *chunk,
+ const struct sctp_association *asoc)
+{
+ /* RFC 2960 Sec 8.5 When receiving an SCTP packet, the endpoint
+ * MUST ensure that the value in the Verification Tag field of
+ * the received SCTP packet matches its own Tag. If the received
+ * Verification Tag value does not match the receiver's own
+ * tag value, the receiver shall silently discard the packet...
+ */
+ if (ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag)
+ return 1;
+
+ return 0;
+}
+
+/* Check VTAG of the packet matches the sender's own tag 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-06 Section 2.13.2
+ *
+ * B) The receiver of a ABORT shall accept the packet if the
+ * Verification Tag field of the packet matches its own tag 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 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....
+ *
+ */
+ if ((ntohl(chunk->sctp_hdr->vtag) == asoc->c.my_vtag) ||
+ (sctp_test_T_bit(chunk) && (ntohl(chunk->sctp_hdr->vtag)
+ == asoc->c.peer_vtag))) {
+ return 1;
+ }
+
+ return 0;
+}
+
+#endif /* __sctp_sm_h__ */