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freebsd-nq/sys/netinet/sctputil.h
Michael Tuexen 10e0318afa Allow SCTP to use the hostcache. 
This patch allows the MTU stored in the hostcache to be used as an
initial value for SCTP paths. When an ICMP PTB message is received,
store the MTU in the hostcache.

MFC after:	1 week
2017-04-29 19:20:50 +00:00

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/*-
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#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
);
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 *);
uint32_t
sctp_calculate_rto(struct sctp_tcb *, struct sctp_association *,
struct sctp_nets *, struct timeval *, int, 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 *);
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 *,
uint8_t, uint32_t,
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 *,
uint8_t, uint32_t, uint16_t,
uint32_t, uint16_t);
int
sctp_connectx_helper_add(struct sctp_tcb *stcb, struct sockaddr *addr,
int totaddr, int *error);
struct sctp_tcb *
sctp_connectx_helper_find(struct sctp_inpcb *inp, struct sockaddr *addr,
unsigned int *totaddr, unsigned int *num_v4, unsigned int *num_v6,
int *error, unsigned int limit, int *bad_addr);
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 *);
struct sockaddr_in6 *
sctp_recover_scope(struct sockaddr_in6 *, struct sockaddr_in6 *);
#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)
#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 */
void sctp_over_udp_stop(void);
int sctp_over_udp_start(void);
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 *, size_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
#if defined(INET6) || defined(INET)
uint32_t sctp_min_mtu(uint32_t, uint32_t, uint32_t);
void sctp_hc_set_mtu(union sctp_sockstore *, uint16_t, uint32_t);
uint32_t sctp_hc_get_mtu(union sctp_sockstore *, uint16_t);
#endif
#endif /* _KERNEL */
#endif
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