| /* SCTP kernel 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 implementation |
| * |
| * These are definitions needed by the state machine. |
| * |
| * 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, 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_operr_notify; |
| sctp_state_fn_t sctp_sf_t1_init_timer_expire; |
| sctp_state_fn_t sctp_sf_t1_cookie_timer_expire; |
| sctp_state_fn_t sctp_sf_t2_timer_expire; |
| sctp_state_fn_t sctp_sf_t4_timer_expire; |
| sctp_state_fn_t sctp_sf_t5_timer_expire; |
| sctp_state_fn_t sctp_sf_sendbeat_8_3; |
| sctp_state_fn_t sctp_sf_beat_8_3; |
| sctp_state_fn_t sctp_sf_backbeat_8_3; |
| sctp_state_fn_t sctp_sf_do_9_2_final; |
| sctp_state_fn_t sctp_sf_do_9_2_shutdown; |
| sctp_state_fn_t sctp_sf_do_9_2_shut_ctsn; |
| sctp_state_fn_t sctp_sf_do_ecn_cwr; |
| sctp_state_fn_t sctp_sf_do_ecne; |
| sctp_state_fn_t sctp_sf_ootb; |
| sctp_state_fn_t sctp_sf_pdiscard; |
| sctp_state_fn_t sctp_sf_violation; |
| sctp_state_fn_t sctp_sf_discard_chunk; |
| sctp_state_fn_t sctp_sf_do_5_2_1_siminit; |
| sctp_state_fn_t sctp_sf_do_5_2_2_dupinit; |
| sctp_state_fn_t sctp_sf_do_5_2_3_initack; |
| 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; |
| sctp_state_fn_t sctp_sf_eat_auth; |
| |
| /* Prototypes for primitive event state functions. */ |
| sctp_state_fn_t sctp_sf_do_prm_asoc; |
| sctp_state_fn_t sctp_sf_do_prm_send; |
| sctp_state_fn_t sctp_sf_do_9_2_prm_shutdown; |
| sctp_state_fn_t sctp_sf_cookie_wait_prm_shutdown; |
| sctp_state_fn_t sctp_sf_cookie_echoed_prm_shutdown; |
| sctp_state_fn_t sctp_sf_do_9_1_prm_abort; |
| sctp_state_fn_t sctp_sf_cookie_wait_prm_abort; |
| sctp_state_fn_t sctp_sf_cookie_echoed_prm_abort; |
| sctp_state_fn_t sctp_sf_shutdown_pending_prm_abort; |
| sctp_state_fn_t sctp_sf_shutdown_sent_prm_abort; |
| sctp_state_fn_t sctp_sf_shutdown_ack_sent_prm_abort; |
| sctp_state_fn_t sctp_sf_error_closed; |
| sctp_state_fn_t sctp_sf_error_shutdown; |
| sctp_state_fn_t sctp_sf_ignore_primitive; |
| sctp_state_fn_t sctp_sf_do_prm_requestheartbeat; |
| sctp_state_fn_t sctp_sf_do_prm_asconf; |
| |
| /* Prototypes for other event state functions. */ |
| sctp_state_fn_t sctp_sf_do_9_2_start_shutdown; |
| sctp_state_fn_t sctp_sf_do_9_2_shutdown_ack; |
| sctp_state_fn_t sctp_sf_ignore_other; |
| sctp_state_fn_t sctp_sf_cookie_wait_icmp_abort; |
| |
| /* Prototypes for timeout event state functions. */ |
| sctp_state_fn_t sctp_sf_do_6_3_3_rtx; |
| sctp_state_fn_t sctp_sf_do_6_2_sack; |
| sctp_state_fn_t sctp_sf_autoclose_timer_expire; |
| |
| /* Prototypes for utility support functions. */ |
| __u8 sctp_get_chunk_type(struct sctp_chunk *chunk); |
| const sctp_sm_table_entry_t *sctp_sm_lookup_event(sctp_event_t, |
| sctp_state_t, |
| sctp_subtype_t); |
| int sctp_chunk_iif(const struct sctp_chunk *); |
| struct sctp_association *sctp_make_temp_asoc(const struct sctp_endpoint *, |
| struct sctp_chunk *, |
| gfp_t gfp); |
| __u32 sctp_generate_verification_tag(void); |
| void sctp_populate_tie_tags(__u8 *cookie, __u32 curTag, __u32 hisTag); |
| |
| /* Prototypes for chunk-building functions. */ |
| struct sctp_chunk *sctp_make_init(const struct sctp_association *, |
| const struct sctp_bind_addr *, |
| gfp_t gfp, int vparam_len); |
| struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *, |
| const struct sctp_chunk *, |
| const gfp_t gfp, |
| const int unkparam_len); |
| struct sctp_chunk *sctp_make_cookie_echo(const struct sctp_association *, |
| const struct sctp_chunk *); |
| struct sctp_chunk *sctp_make_cookie_ack(const struct sctp_association *, |
| const struct sctp_chunk *); |
| struct sctp_chunk *sctp_make_cwr(const struct sctp_association *, |
| const __u32 lowest_tsn, |
| const struct sctp_chunk *); |
| struct sctp_chunk * sctp_make_datafrag_empty(struct sctp_association *, |
| const struct sctp_sndrcvinfo *sinfo, |
| int len, const __u8 flags, |
| __u16 ssn); |
| struct sctp_chunk *sctp_make_ecne(const struct sctp_association *, |
| const __u32); |
| struct sctp_chunk *sctp_make_sack(const struct sctp_association *); |
| struct sctp_chunk *sctp_make_shutdown(const struct sctp_association *asoc, |
| const struct sctp_chunk *chunk); |
| struct sctp_chunk *sctp_make_shutdown_ack(const struct sctp_association *asoc, |
| const struct sctp_chunk *); |
| struct sctp_chunk *sctp_make_shutdown_complete(const struct sctp_association *, |
| const struct sctp_chunk *); |
| void sctp_init_cause(struct sctp_chunk *, __be16 cause, 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 msghdr *, size_t msg_len); |
| 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_violation_paramlen(const struct sctp_association *, |
| const struct sctp_chunk *, |
| struct sctp_paramhdr *); |
| 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, |
| __be16 cause_code, |
| const void *payload, |
| size_t paylen, |
| size_t reserve_tail); |
| |
| struct sctp_chunk *sctp_make_asconf_update_ip(struct sctp_association *, |
| union sctp_addr *, |
| struct sockaddr *, |
| int, __be16); |
| struct sctp_chunk *sctp_make_asconf_set_prim(struct sctp_association *asoc, |
| union sctp_addr *addr); |
| int sctp_verify_asconf(const struct sctp_association *asoc, |
| struct sctp_paramhdr *param_hdr, void *chunk_end, |
| struct sctp_paramhdr **errp); |
| 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); |
| struct sctp_chunk *sctp_make_auth(const struct sctp_association *asoc); |
| |
| void sctp_chunk_assign_tsn(struct sctp_chunk *); |
| void sctp_chunk_assign_ssn(struct sctp_chunk *); |
| |
| /* Prototypes for statetable processing. */ |
| |
| int sctp_do_sm(sctp_event_t event_type, sctp_subtype_t subtype, |
| sctp_state_t state, |
| struct sctp_endpoint *, |
| struct sctp_association *asoc, |
| void *event_arg, |
| gfp_t gfp); |
| |
| /* 2nd level prototypes */ |
| void sctp_generate_t3_rtx_event(unsigned long peer); |
| void sctp_generate_heartbeat_event(unsigned long peer); |
| void sctp_generate_proto_unreach_event(unsigned long peer); |
| |
| void sctp_ootb_pkt_free(struct sctp_packet *); |
| |
| struct sctp_association *sctp_unpack_cookie(const struct sctp_endpoint *, |
| const struct sctp_association *, |
| struct sctp_chunk *, |
| gfp_t gfp, int *err, |
| struct sctp_chunk **err_chk_p); |
| int sctp_addip_addr_config(struct sctp_association *, sctp_param_t, |
| struct sockaddr_storage*, int); |
| |
| /* 3rd level prototypes */ |
| __u32 sctp_generate_tag(const struct sctp_endpoint *); |
| __u32 sctp_generate_tsn(const struct sctp_endpoint *); |
| |
| /* Extern declarations for major data structures. */ |
| extern sctp_timer_event_t *sctp_timer_events[SCTP_NUM_TIMEOUT_TYPES]; |
| |
| |
| /* Get the size of a DATA chunk payload. */ |
| static inline __u16 sctp_data_size(struct sctp_chunk *chunk) |
| { |
| __u16 size; |
| |
| size = ntohs(chunk->chunk_hdr->length); |
| size -= sizeof(sctp_data_chunk_t); |
| |
| return size; |
| } |
| |
| /* Compare two TSNs */ |
| |
| /* RFC 1982 - Serial Number Arithmetic |
| * |
| * 2. Comparison |
| * Then, s1 is said to be equal to s2 if and only if i1 is equal to i2, |
| * in all other cases, s1 is not equal to s2. |
| * |
| * s1 is said to be less than s2 if, and only if, s1 is not equal to s2, |
| * and |
| * |
| * (i1 < i2 and i2 - i1 < 2^(SERIAL_BITS - 1)) or |
| * (i1 > i2 and i1 - i2 > 2^(SERIAL_BITS - 1)) |
| * |
| * s1 is said to be greater than s2 if, and only if, s1 is not equal to |
| * s2, and |
| * |
| * (i1 < i2 and i2 - i1 > 2^(SERIAL_BITS - 1)) or |
| * (i1 > i2 and i1 - i2 < 2^(SERIAL_BITS - 1)) |
| */ |
| |
| /* |
| * RFC 2960 |
| * 1.6 Serial Number Arithmetic |
| * |
| * Comparisons and arithmetic on TSNs in this document SHOULD use Serial |
| * Number Arithmetic as defined in [RFC1982] where SERIAL_BITS = 32. |
| */ |
| |
| enum { |
| TSN_SIGN_BIT = (1<<31) |
| }; |
| |
| static inline int TSN_lt(__u32 s, __u32 t) |
| { |
| return ((s) - (t)) & TSN_SIGN_BIT; |
| } |
| |
| static inline int TSN_lte(__u32 s, __u32 t) |
| { |
| return ((s) == (t)) || (((s) - (t)) & TSN_SIGN_BIT); |
| } |
| |
| /* Compare two SSNs */ |
| |
| /* |
| * RFC 2960 |
| * 1.6 Serial Number Arithmetic |
| * |
| * Comparisons and arithmetic on Stream Sequence Numbers in this document |
| * SHOULD use Serial Number Arithmetic as defined in [RFC1982] where |
| * SERIAL_BITS = 16. |
| */ |
| enum { |
| SSN_SIGN_BIT = (1<<15) |
| }; |
| |
| static inline int SSN_lt(__u16 s, __u16 t) |
| { |
| return ((s) - (t)) & SSN_SIGN_BIT; |
| } |
| |
| static inline int SSN_lte(__u16 s, __u16 t) |
| { |
| return ((s) == (t)) || (((s) - (t)) & SSN_SIGN_BIT); |
| } |
| |
| /* |
| * ADDIP 3.1.1 |
| * The valid range of Serial Number is from 0 to 4294967295 (2**32 - 1). Serial |
| * Numbers wrap back to 0 after reaching 4294967295. |
| */ |
| enum { |
| ADDIP_SERIAL_SIGN_BIT = (1<<31) |
| }; |
| |
| static inline int ADDIP_SERIAL_gte(__u16 s, __u16 t) |
| { |
| return ((s) == (t)) || (((t) - (s)) & ADDIP_SERIAL_SIGN_BIT); |
| } |
| |
| /* 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__ */ |