Initial import

1 files changed, 445 insertions, 0 deletions

diff --git a/include/net/sctp/sm.h b/include/net/sctp/sm.h
new file mode 100644
index 000000000..487ef34bb
--- /dev/null
+++ b/include/net/sctp/sm.h
@@ -0,0 +1,445 @@
+/* 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, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email addresses:
+ *    lksctp developers <linux-sctp@vger.kernel.org>
+ *
+ * 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>
+ */
+
+#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) (struct net *,
+					      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_no_pending_tsn;
+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(struct net *,
+					    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 *,
+					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_violation_max_retrans(const struct sctp_association *,
+						   const struct sctp_chunk *);
+struct sctp_chunk *sctp_make_heartbeat(const struct sctp_association *,
+				  const struct sctp_transport *);
+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);
+bool sctp_verify_asconf(const struct sctp_association *asoc,
+			struct sctp_chunk *chunk, bool addr_param_needed,
+			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(struct net *net, 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__ */