usrsctplib/netinet/sctputil.h - platform/external/usrsctp - Git at Google

 /*-
  * SPDX-License-Identifier: BSD-3-Clause
  *
  * Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * a) Redistributions of source code must retain the above copyright notice,
  *    this list of conditions and the following disclaimer.
  *
  * b) Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in
  *    the documentation and/or other materials provided with the distribution.
  *
  * c) Neither the name of Cisco Systems, Inc. nor the names of its
  *    contributors may be used to endorse or promote products derived
  *    from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */

 #ifdef __FreeBSD__
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD: head/sys/netinet/sctputil.h 359405 2020-03-28 20:25:45Z tuexen $");
 #endif

 #ifndef _NETINET_SCTP_UTIL_H_
 #define _NETINET_SCTP_UTIL_H_

 #if defined(_KERNEL) || defined(__Userspace__)

 #define SCTP_READ_LOCK_HELD 1
 #define SCTP_READ_LOCK_NOT_HELD 0

 #ifdef SCTP_ASOCLOG_OF_TSNS
 void sctp_print_out_track_log(struct sctp_tcb *stcb);
 #endif

 #ifdef SCTP_MBUF_LOGGING
 struct mbuf *sctp_m_free(struct mbuf *m);
 void sctp_m_freem(struct mbuf *m);
 #else
 #define sctp_m_free m_free
 #define sctp_m_freem m_freem
 #endif

 #if defined(SCTP_LOCAL_TRACE_BUF) || defined(__APPLE__)
 void
 sctp_log_trace(uint32_t fr, const char *str SCTP_UNUSED, uint32_t a, uint32_t b, uint32_t c, uint32_t d, uint32_t e, uint32_t f);
 #endif

 #define sctp_get_associd(stcb) ((sctp_assoc_t)stcb->asoc.assoc_id)


 /*
  * Function prototypes
  */
 int32_t
 sctp_map_assoc_state(int);

 uint32_t
 sctp_get_ifa_hash_val(struct sockaddr *addr);

 struct sctp_ifa *
 sctp_find_ifa_in_ep(struct sctp_inpcb *inp, struct sockaddr *addr, int hold_lock);

 struct sctp_ifa *
 sctp_find_ifa_by_addr(struct sockaddr *addr, uint32_t vrf_id, int holds_lock);

 uint32_t sctp_select_initial_TSN(struct sctp_pcb *);

 uint32_t sctp_select_a_tag(struct sctp_inpcb *, uint16_t lport, uint16_t rport, int);

 int sctp_init_asoc(struct sctp_inpcb *, struct sctp_tcb *, uint32_t, uint32_t, uint16_t);

 void sctp_fill_random_store(struct sctp_pcb *);

 void
 sctp_notify_stream_reset_add(struct sctp_tcb *stcb, uint16_t numberin,
 			     uint16_t numberout, int flag);
 void
 sctp_notify_stream_reset_tsn(struct sctp_tcb *stcb, uint32_t sending_tsn, uint32_t recv_tsn, int flag);

 void
 sctp_timer_start(int, struct sctp_inpcb *, struct sctp_tcb *,
     struct sctp_nets *);

 void
 sctp_timer_stop(int, struct sctp_inpcb *, struct sctp_tcb *,
     struct sctp_nets *, uint32_t);

 int
 sctp_dynamic_set_primary(struct sockaddr *sa, uint32_t vrf_id);

 void
 sctp_mtu_size_reset(struct sctp_inpcb *, struct sctp_association *, uint32_t);

 void
 sctp_wakeup_the_read_socket(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
     int so_locked
 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
     SCTP_UNUSED
 #endif
 );

 #if defined(__Userspace__)
 void sctp_invoke_recv_callback(struct sctp_inpcb *,
     struct sctp_tcb *,
     struct sctp_queued_to_read *,
     int);

 #endif
 void
 sctp_add_to_readq(struct sctp_inpcb *inp,
     struct sctp_tcb *stcb,
     struct sctp_queued_to_read *control,
     struct sockbuf *sb,
     int end,
     int inpread_locked,
     int so_locked
 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
     SCTP_UNUSED
 #endif
     );

 void sctp_iterator_worker(void);

 uint32_t sctp_get_prev_mtu(uint32_t);
 uint32_t sctp_get_next_mtu(uint32_t);

 void
 sctp_timeout_handler(void *);

 int
 sctp_calculate_rto(struct sctp_tcb *, struct sctp_association *,
     struct sctp_nets *, struct timeval *, int);

 uint32_t sctp_calculate_len(struct mbuf *);

 caddr_t sctp_m_getptr(struct mbuf *, int, int, uint8_t *);

 struct sctp_paramhdr *
 sctp_get_next_param(struct mbuf *, int,
     struct sctp_paramhdr *, int);

 struct mbuf *
 sctp_add_pad_tombuf(struct mbuf *, int);

 struct mbuf *
 sctp_pad_lastmbuf(struct mbuf *, int, struct mbuf *);

 void sctp_ulp_notify(uint32_t, struct sctp_tcb *, uint32_t, void *, int
 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
     SCTP_UNUSED
 #endif
     );

 void
 sctp_pull_off_control_to_new_inp(struct sctp_inpcb *old_inp,
     struct sctp_inpcb *new_inp,
     struct sctp_tcb *stcb, int waitflags);


 void sctp_stop_timers_for_shutdown(struct sctp_tcb *);

 /* Stop all timers for association and remote addresses. */
 void sctp_stop_association_timers(struct sctp_tcb *, bool);

 void sctp_report_all_outbound(struct sctp_tcb *, uint16_t, int, int
 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
     SCTP_UNUSED
 #endif
     );

 int sctp_expand_mapping_array(struct sctp_association *, uint32_t);

 void sctp_abort_notification(struct sctp_tcb *, uint8_t, uint16_t,
 			     struct sctp_abort_chunk *, int
 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
     SCTP_UNUSED
 #endif
     );

 /* We abort responding to an IP packet for some reason */
 void
 sctp_abort_association(struct sctp_inpcb *, struct sctp_tcb *, struct mbuf *,
                        int, struct sockaddr *, struct sockaddr *,
                        struct sctphdr *, struct mbuf *,
 #if defined(__FreeBSD__)
                        uint8_t, uint32_t,
 #endif
                        uint32_t, uint16_t);


 /* We choose to abort via user input */
 void
 sctp_abort_an_association(struct sctp_inpcb *, struct sctp_tcb *,
     struct mbuf *, int
 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
     SCTP_UNUSED
 #endif
 );

 void sctp_handle_ootb(struct mbuf *, int, int,
                       struct sockaddr *, struct sockaddr *,
                       struct sctphdr *, struct sctp_inpcb *,
                       struct mbuf *,
 #if defined(__FreeBSD__)
                       uint8_t, uint32_t, uint16_t,
 #endif
                       uint32_t, uint16_t);

 int sctp_connectx_helper_add(struct sctp_tcb *stcb, struct sockaddr *addr,
     int totaddr, int *error);

 int
 sctp_connectx_helper_find(struct sctp_inpcb *, struct sockaddr *,
     unsigned int, unsigned int *, unsigned int *, unsigned int);

 int sctp_is_there_an_abort_here(struct mbuf *, int, uint32_t *);
 #ifdef INET6
 uint32_t sctp_is_same_scope(struct sockaddr_in6 *, struct sockaddr_in6 *);

 #if defined(SCTP_EMBEDDED_V6_SCOPE)
 struct sockaddr_in6 *
 sctp_recover_scope(struct sockaddr_in6 *, struct sockaddr_in6 *);

 #ifdef SCTP_KAME
 #define sctp_recover_scope_mac(addr, store) do { \
 	 if ((addr->sin6_family == AF_INET6) && \
 	     (IN6_IS_SCOPE_LINKLOCAL(&addr->sin6_addr))) { \
 		*store = *addr; \
 		if (addr->sin6_scope_id == 0) { \
 			if (!sa6_recoverscope(store)) { \
 				addr = store; \
 			} \
 		} else { \
 			in6_clearscope(&addr->sin6_addr); \
 			addr = store; \
 		} \
 	 } \
 } while (0)
 #else
 #define sctp_recover_scope_mac(addr, store) do { \
 	if ((addr->sin6_family == AF_INET6) && \
 	    (IN6_IS_SCOPE_LINKLOCAL(&addr->sin6_addr))) { \
 		*store = *addr; \
 		if (addr->sin6_scope_id == 0) { \
 			if (!in6_recoverscope(store, &store->sin6_addr, \
 					      NULL)) { \
 				addr = store; \
 			} \
 		} else { \
 			in6_clearscope(&addr->sin6_addr); \
 			addr = store; \
 		} \
 	} \
 } while (0)
 #endif
 #endif
 #endif

 int sctp_cmpaddr(struct sockaddr *, struct sockaddr *);

 void sctp_print_address(struct sockaddr *);

 int
 sctp_release_pr_sctp_chunk(struct sctp_tcb *, struct sctp_tmit_chunk *,
     uint8_t, int
 #if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
     SCTP_UNUSED
 #endif
 );

 struct mbuf *sctp_generate_cause(uint16_t, char *);
 struct mbuf *sctp_generate_no_user_data_cause(uint32_t);

 void sctp_bindx_add_address(struct socket *so, struct sctp_inpcb *inp,
 			    struct sockaddr *sa, sctp_assoc_t assoc_id,
 			    uint32_t vrf_id, int *error, void *p);
 void sctp_bindx_delete_address(struct sctp_inpcb *inp,
 			       struct sockaddr *sa, sctp_assoc_t assoc_id,
 			       uint32_t vrf_id, int *error);

 int sctp_local_addr_count(struct sctp_tcb *stcb);

 #ifdef SCTP_MBCNT_LOGGING
 void
 sctp_free_bufspace(struct sctp_tcb *, struct sctp_association *,
     struct sctp_tmit_chunk *, int);

 #else
 #define sctp_free_bufspace(stcb, asoc, tp1, chk_cnt)  \
 do { \
 	if (tp1->data != NULL) { \
 		atomic_subtract_int(&((asoc)->chunks_on_out_queue), chk_cnt); \
 		if ((asoc)->total_output_queue_size >= tp1->book_size) { \
 			atomic_subtract_int(&((asoc)->total_output_queue_size), tp1->book_size); \
 		} else { \
 			(asoc)->total_output_queue_size = 0; \
 		} \
 		if (stcb->sctp_socket && ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || \
 		    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
 			if (stcb->sctp_socket->so_snd.sb_cc >= tp1->book_size) { \
 				atomic_subtract_int(&((stcb)->sctp_socket->so_snd.sb_cc), tp1->book_size); \
 			} else { \
 				stcb->sctp_socket->so_snd.sb_cc = 0; \
 			} \
 		} \
 	} \
 } while (0)

 #endif

 #define sctp_free_spbufspace(stcb, asoc, sp)  \
 do { \
 	if (sp->data != NULL) { \
 		if ((asoc)->total_output_queue_size >= sp->length) { \
 			atomic_subtract_int(&(asoc)->total_output_queue_size, sp->length); \
 		} else { \
 			(asoc)->total_output_queue_size = 0; \
 		} \
 		if (stcb->sctp_socket && ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || \
 		    (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
 			if (stcb->sctp_socket->so_snd.sb_cc >= sp->length) { \
 				atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc,sp->length); \
 			} else { \
 				stcb->sctp_socket->so_snd.sb_cc = 0; \
 			} \
 		} \
 	} \
 } while (0)

 #define sctp_snd_sb_alloc(stcb, sz)  \
 do { \
 	atomic_add_int(&stcb->asoc.total_output_queue_size,sz); \
 	if ((stcb->sctp_socket != NULL) && \
 	    ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || \
 	     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
 		atomic_add_int(&stcb->sctp_socket->so_snd.sb_cc,sz); \
 	} \
 } while (0)

 /* functions to start/stop udp tunneling */
 #if defined(__APPLE__) || defined(__FreeBSD__)
 void sctp_over_udp_stop(void);
 int sctp_over_udp_start(void);
 #endif
 #if defined(__Windows__)
 void sctp_over_udp_restart(void);
 #endif

 int
 sctp_soreceive(struct socket *so, struct sockaddr **psa,
     struct uio *uio,
     struct mbuf **mp0,
     struct mbuf **controlp,
     int *flagsp);

 void
 sctp_misc_ints(uint8_t from, uint32_t a, uint32_t b, uint32_t c, uint32_t d);

 void
 sctp_wakeup_log(struct sctp_tcb *stcb,
     uint32_t wake_cnt, int from);

 void sctp_log_strm_del_alt(struct sctp_tcb *stcb, uint32_t, uint16_t, uint16_t, int);

 void sctp_log_nagle_event(struct sctp_tcb *stcb, int action);


 #ifdef SCTP_MBUF_LOGGING
 void
 sctp_log_mb(struct mbuf *m, int from);

 void
 sctp_log_mbc(struct mbuf *m, int from);
 #endif

 void
 sctp_sblog(struct sockbuf *sb,
     struct sctp_tcb *stcb, int from, int incr);

 void
 sctp_log_strm_del(struct sctp_queued_to_read *control,
     struct sctp_queued_to_read *poschk,
     int from);
 void sctp_log_cwnd(struct sctp_tcb *stcb, struct sctp_nets *, int, uint8_t);
 void rto_logging(struct sctp_nets *net, int from);

 void sctp_log_closing(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int16_t loc);

 void sctp_log_lock(struct sctp_inpcb *inp, struct sctp_tcb *stcb, uint8_t from);
 void sctp_log_maxburst(struct sctp_tcb *stcb, struct sctp_nets *, int, int, uint8_t);
 void sctp_log_block(uint8_t, struct sctp_association *, ssize_t);
 void sctp_log_rwnd(uint8_t, uint32_t, uint32_t, uint32_t);
 void sctp_log_rwnd_set(uint8_t, uint32_t, uint32_t, uint32_t, uint32_t);
 int sctp_fill_stat_log(void *, size_t *);
 void sctp_log_fr(uint32_t, uint32_t, uint32_t, int);
 void sctp_log_sack(uint32_t, uint32_t, uint32_t, uint16_t, uint16_t, int);
 void sctp_log_map(uint32_t, uint32_t, uint32_t, int);
 void sctp_print_mapping_array(struct sctp_association *asoc);
 void sctp_clr_stat_log(void);


 #ifdef SCTP_AUDITING_ENABLED
 void
 sctp_auditing(int, struct sctp_inpcb *, struct sctp_tcb *,
     struct sctp_nets *);
 void sctp_audit_log(uint8_t, uint8_t);

 #endif
 uint32_t sctp_min_mtu(uint32_t, uint32_t, uint32_t);
 #if defined(__FreeBSD__)
 void sctp_hc_set_mtu(union sctp_sockstore *, uint16_t, uint32_t);
 uint32_t sctp_hc_get_mtu(union sctp_sockstore *, uint16_t);
 #endif
 void sctp_set_state(struct sctp_tcb *, int);
 void sctp_add_substate(struct sctp_tcb *, int);
 uint32_t sctp_ticks_to_msecs(uint32_t);
 uint32_t sctp_msecs_to_ticks(uint32_t);
 uint32_t sctp_ticks_to_secs(uint32_t);
 uint32_t sctp_secs_to_ticks(uint32_t);

 #endif				/* _KERNEL */
 #endif
	/*-
	* SPDX-License-Identifier: BSD-3-Clause
	*
	* Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
	* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
	* Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions are met:
	*
	* a) Redistributions of source code must retain the above copyright notice,
	* this list of conditions and the following disclaimer.
	*
	* b) Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the distribution.
	*
	* c) Neither the name of Cisco Systems, Inc. nor the names of its
	* contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
	* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
	* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
	* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
	* THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#ifdef __FreeBSD__
	#include <sys/cdefs.h>
	__FBSDID("$FreeBSD: head/sys/netinet/sctputil.h 359405 2020-03-28 20:25:45Z tuexen $");
	#endif

	#ifndef _NETINET_SCTP_UTIL_H_
	#define _NETINET_SCTP_UTIL_H_

	#if defined(_KERNEL) \|\| defined(__Userspace__)

	#define SCTP_READ_LOCK_HELD 1
	#define SCTP_READ_LOCK_NOT_HELD 0

	#ifdef SCTP_ASOCLOG_OF_TSNS
	void sctp_print_out_track_log(struct sctp_tcb *stcb);
	#endif

	#ifdef SCTP_MBUF_LOGGING
	struct mbuf sctp_m_free(struct mbuf m);
	void sctp_m_freem(struct mbuf *m);
	#else
	#define sctp_m_free m_free
	#define sctp_m_freem m_freem
	#endif

	#if defined(SCTP_LOCAL_TRACE_BUF) \|\| defined(__APPLE__)
	void
	sctp_log_trace(uint32_t fr, const char *str SCTP_UNUSED, uint32_t a, uint32_t b, uint32_t c, uint32_t d, uint32_t e, uint32_t f);
	#endif

	#define sctp_get_associd(stcb) ((sctp_assoc_t)stcb->asoc.assoc_id)


	/*
	* Function prototypes
	*/
	int32_t
	sctp_map_assoc_state(int);

	uint32_t
	sctp_get_ifa_hash_val(struct sockaddr *addr);

	struct sctp_ifa *
	sctp_find_ifa_in_ep(struct sctp_inpcb inp, struct sockaddr addr, int hold_lock);

	struct sctp_ifa *
	sctp_find_ifa_by_addr(struct sockaddr *addr, uint32_t vrf_id, int holds_lock);

	uint32_t sctp_select_initial_TSN(struct sctp_pcb *);

	uint32_t sctp_select_a_tag(struct sctp_inpcb *, uint16_t lport, uint16_t rport, int);

	int sctp_init_asoc(struct sctp_inpcb , struct sctp_tcb , uint32_t, uint32_t, uint16_t);

	void sctp_fill_random_store(struct sctp_pcb *);

	void
	sctp_notify_stream_reset_add(struct sctp_tcb *stcb, uint16_t numberin,
	uint16_t numberout, int flag);
	void
	sctp_notify_stream_reset_tsn(struct sctp_tcb *stcb, uint32_t sending_tsn, uint32_t recv_tsn, int flag);

	void
	sctp_timer_start(int, struct sctp_inpcb , struct sctp_tcb ,
	struct sctp_nets *);

	void
	sctp_timer_stop(int, struct sctp_inpcb , struct sctp_tcb ,
	struct sctp_nets *, uint32_t);

	int
	sctp_dynamic_set_primary(struct sockaddr *sa, uint32_t vrf_id);

	void
	sctp_mtu_size_reset(struct sctp_inpcb , struct sctp_association , uint32_t);

	void
	sctp_wakeup_the_read_socket(struct sctp_inpcb inp, struct sctp_tcb stcb,
	int so_locked
	#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
	SCTP_UNUSED
	#endif
	);

	#if defined(__Userspace__)
	void sctp_invoke_recv_callback(struct sctp_inpcb *,
	struct sctp_tcb *,
	struct sctp_queued_to_read *,
	int);

	#endif
	void
	sctp_add_to_readq(struct sctp_inpcb *inp,
	struct sctp_tcb *stcb,
	struct sctp_queued_to_read *control,
	struct sockbuf *sb,
	int end,
	int inpread_locked,
	int so_locked
	#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
	SCTP_UNUSED
	#endif
	);

	void sctp_iterator_worker(void);

	uint32_t sctp_get_prev_mtu(uint32_t);
	uint32_t sctp_get_next_mtu(uint32_t);

	void
	sctp_timeout_handler(void *);

	int
	sctp_calculate_rto(struct sctp_tcb , struct sctp_association ,
	struct sctp_nets , struct timeval , int);

	uint32_t sctp_calculate_len(struct mbuf *);

	caddr_t sctp_m_getptr(struct mbuf , int, int, uint8_t );

	struct sctp_paramhdr *
	sctp_get_next_param(struct mbuf *, int,
	struct sctp_paramhdr *, int);

	struct mbuf *
	sctp_add_pad_tombuf(struct mbuf *, int);

	struct mbuf *
	sctp_pad_lastmbuf(struct mbuf , int, struct mbuf );

	void sctp_ulp_notify(uint32_t, struct sctp_tcb , uint32_t, void , int
	#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
	SCTP_UNUSED
	#endif
	);

	void
	sctp_pull_off_control_to_new_inp(struct sctp_inpcb *old_inp,
	struct sctp_inpcb *new_inp,
	struct sctp_tcb *stcb, int waitflags);


	void sctp_stop_timers_for_shutdown(struct sctp_tcb *);

	/* Stop all timers for association and remote addresses. */
	void sctp_stop_association_timers(struct sctp_tcb *, bool);

	void sctp_report_all_outbound(struct sctp_tcb *, uint16_t, int, int
	#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
	SCTP_UNUSED
	#endif
	);

	int sctp_expand_mapping_array(struct sctp_association *, uint32_t);

	void sctp_abort_notification(struct sctp_tcb *, uint8_t, uint16_t,
	struct sctp_abort_chunk *, int
	#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
	SCTP_UNUSED
	#endif
	);

	/* We abort responding to an IP packet for some reason */
	void
	sctp_abort_association(struct sctp_inpcb , struct sctp_tcb , struct mbuf *,
	int, struct sockaddr , struct sockaddr ,
	struct sctphdr , struct mbuf ,
	#if defined(__FreeBSD__)
	uint8_t, uint32_t,
	#endif
	uint32_t, uint16_t);


	/* We choose to abort via user input */
	void
	sctp_abort_an_association(struct sctp_inpcb , struct sctp_tcb ,
	struct mbuf *, int
	#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
	SCTP_UNUSED
	#endif
	);

	void sctp_handle_ootb(struct mbuf *, int, int,
	struct sockaddr , struct sockaddr ,
	struct sctphdr , struct sctp_inpcb ,
	struct mbuf *,
	#if defined(__FreeBSD__)
	uint8_t, uint32_t, uint16_t,
	#endif
	uint32_t, uint16_t);

	int sctp_connectx_helper_add(struct sctp_tcb stcb, struct sockaddr addr,
	int totaddr, int *error);

	int
	sctp_connectx_helper_find(struct sctp_inpcb , struct sockaddr ,
	unsigned int, unsigned int , unsigned int , unsigned int);

	int sctp_is_there_an_abort_here(struct mbuf , int, uint32_t );
	#ifdef INET6
	uint32_t sctp_is_same_scope(struct sockaddr_in6 , struct sockaddr_in6 );

	#if defined(SCTP_EMBEDDED_V6_SCOPE)
	struct sockaddr_in6 *
	sctp_recover_scope(struct sockaddr_in6 , struct sockaddr_in6 );

	#ifdef SCTP_KAME
	#define sctp_recover_scope_mac(addr, store) do { \
	if ((addr->sin6_family == AF_INET6) && \
	(IN6_IS_SCOPE_LINKLOCAL(&addr->sin6_addr))) { \
	store = addr; \
	if (addr->sin6_scope_id == 0) { \
	if (!sa6_recoverscope(store)) { \
	addr = store; \
	} \
	} else { \
	in6_clearscope(&addr->sin6_addr); \
	addr = store; \
	} \
	} \
	} while (0)
	#else
	#define sctp_recover_scope_mac(addr, store) do { \
	if ((addr->sin6_family == AF_INET6) && \
	(IN6_IS_SCOPE_LINKLOCAL(&addr->sin6_addr))) { \
	store = addr; \
	if (addr->sin6_scope_id == 0) { \
	if (!in6_recoverscope(store, &store->sin6_addr, \
	NULL)) { \
	addr = store; \
	} \
	} else { \
	in6_clearscope(&addr->sin6_addr); \
	addr = store; \
	} \
	} \
	} while (0)
	#endif
	#endif
	#endif

	int sctp_cmpaddr(struct sockaddr , struct sockaddr );

	void sctp_print_address(struct sockaddr *);

	int
	sctp_release_pr_sctp_chunk(struct sctp_tcb , struct sctp_tmit_chunk ,
	uint8_t, int
	#if !defined(__APPLE__) && !defined(SCTP_SO_LOCK_TESTING)
	SCTP_UNUSED
	#endif
	);

	struct mbuf sctp_generate_cause(uint16_t, char );
	struct mbuf *sctp_generate_no_user_data_cause(uint32_t);

	void sctp_bindx_add_address(struct socket so, struct sctp_inpcb inp,
	struct sockaddr *sa, sctp_assoc_t assoc_id,
	uint32_t vrf_id, int error, void p);
	void sctp_bindx_delete_address(struct sctp_inpcb *inp,
	struct sockaddr *sa, sctp_assoc_t assoc_id,
	uint32_t vrf_id, int *error);

	int sctp_local_addr_count(struct sctp_tcb *stcb);

	#ifdef SCTP_MBCNT_LOGGING
	void
	sctp_free_bufspace(struct sctp_tcb , struct sctp_association ,
	struct sctp_tmit_chunk *, int);

	#else
	#define sctp_free_bufspace(stcb, asoc, tp1, chk_cnt) \
	do { \
	if (tp1->data != NULL) { \
	atomic_subtract_int(&((asoc)->chunks_on_out_queue), chk_cnt); \
	if ((asoc)->total_output_queue_size >= tp1->book_size) { \
	atomic_subtract_int(&((asoc)->total_output_queue_size), tp1->book_size); \
	} else { \
	(asoc)->total_output_queue_size = 0; \
	} \
	if (stcb->sctp_socket && ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) \|\| \
	(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
	if (stcb->sctp_socket->so_snd.sb_cc >= tp1->book_size) { \
	atomic_subtract_int(&((stcb)->sctp_socket->so_snd.sb_cc), tp1->book_size); \
	} else { \
	stcb->sctp_socket->so_snd.sb_cc = 0; \
	} \
	} \
	} \
	} while (0)

	#endif

	#define sctp_free_spbufspace(stcb, asoc, sp) \
	do { \
	if (sp->data != NULL) { \
	if ((asoc)->total_output_queue_size >= sp->length) { \
	atomic_subtract_int(&(asoc)->total_output_queue_size, sp->length); \
	} else { \
	(asoc)->total_output_queue_size = 0; \
	} \
	if (stcb->sctp_socket && ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) \|\| \
	(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
	if (stcb->sctp_socket->so_snd.sb_cc >= sp->length) { \
	atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc,sp->length); \
	} else { \
	stcb->sctp_socket->so_snd.sb_cc = 0; \
	} \
	} \
	} \
	} while (0)

	#define sctp_snd_sb_alloc(stcb, sz) \
	do { \
	atomic_add_int(&stcb->asoc.total_output_queue_size,sz); \
	if ((stcb->sctp_socket != NULL) && \
	((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) \|\| \
	(stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
	atomic_add_int(&stcb->sctp_socket->so_snd.sb_cc,sz); \
	} \
	} while (0)

	/* functions to start/stop udp tunneling */
	#if defined(__APPLE__) \|\| defined(__FreeBSD__)
	void sctp_over_udp_stop(void);
	int sctp_over_udp_start(void);
	#endif
	#if defined(__Windows__)
	void sctp_over_udp_restart(void);
	#endif

	int
	sctp_soreceive(struct socket so, struct sockaddr *psa,
	struct uio *uio,
	struct mbuf **mp0,
	struct mbuf **controlp,
	int *flagsp);

	void
	sctp_misc_ints(uint8_t from, uint32_t a, uint32_t b, uint32_t c, uint32_t d);

	void
	sctp_wakeup_log(struct sctp_tcb *stcb,
	uint32_t wake_cnt, int from);

	void sctp_log_strm_del_alt(struct sctp_tcb *stcb, uint32_t, uint16_t, uint16_t, int);

	void sctp_log_nagle_event(struct sctp_tcb *stcb, int action);


	#ifdef SCTP_MBUF_LOGGING
	void
	sctp_log_mb(struct mbuf *m, int from);

	void
	sctp_log_mbc(struct mbuf *m, int from);
	#endif

	void
	sctp_sblog(struct sockbuf *sb,
	struct sctp_tcb *stcb, int from, int incr);

	void
	sctp_log_strm_del(struct sctp_queued_to_read *control,
	struct sctp_queued_to_read *poschk,
	int from);
	void sctp_log_cwnd(struct sctp_tcb stcb, struct sctp_nets , int, uint8_t);
	void rto_logging(struct sctp_nets *net, int from);

	void sctp_log_closing(struct sctp_inpcb inp, struct sctp_tcb stcb, int16_t loc);

	void sctp_log_lock(struct sctp_inpcb inp, struct sctp_tcb stcb, uint8_t from);
	void sctp_log_maxburst(struct sctp_tcb stcb, struct sctp_nets , int, int, uint8_t);
	void sctp_log_block(uint8_t, struct sctp_association *, ssize_t);
	void sctp_log_rwnd(uint8_t, uint32_t, uint32_t, uint32_t);
	void sctp_log_rwnd_set(uint8_t, uint32_t, uint32_t, uint32_t, uint32_t);
	int sctp_fill_stat_log(void , size_t );
	void sctp_log_fr(uint32_t, uint32_t, uint32_t, int);
	void sctp_log_sack(uint32_t, uint32_t, uint32_t, uint16_t, uint16_t, int);
	void sctp_log_map(uint32_t, uint32_t, uint32_t, int);
	void sctp_print_mapping_array(struct sctp_association *asoc);
	void sctp_clr_stat_log(void);


	#ifdef SCTP_AUDITING_ENABLED
	void
	sctp_auditing(int, struct sctp_inpcb , struct sctp_tcb ,
	struct sctp_nets *);
	void sctp_audit_log(uint8_t, uint8_t);

	#endif
	uint32_t sctp_min_mtu(uint32_t, uint32_t, uint32_t);
	#if defined(__FreeBSD__)
	void sctp_hc_set_mtu(union sctp_sockstore *, uint16_t, uint32_t);
	uint32_t sctp_hc_get_mtu(union sctp_sockstore *, uint16_t);
	#endif
	void sctp_set_state(struct sctp_tcb *, int);
	void sctp_add_substate(struct sctp_tcb *, int);
	uint32_t sctp_ticks_to_msecs(uint32_t);
	uint32_t sctp_msecs_to_ticks(uint32_t);
	uint32_t sctp_ticks_to_secs(uint32_t);
	uint32_t sctp_secs_to_ticks(uint32_t);

	#endif /* _KERNEL */
	#endif