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freebsd/sys/netinet/sctp_lock_bsd.h
Randall Stewart df6e0cc37d - Make strict-sacks be the default. 
- Change it so that without INVARIANTs there are
  no panics in SCTP.
- sctp_timer changes so that we have a recovery mechanism
  when the sent list is out of order.
2008-08-28 09:44:07 +00:00

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#ifndef __sctp_lock_bsd_h__
#define __sctp_lock_bsd_h__
/*-
* Copyright (c) 2001-2007, by Cisco Systems, Inc. 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.
*/
/*
* General locking concepts: The goal of our locking is to of course provide
* consistency and yet minimize overhead. We will attempt to use
* non-recursive locks which are supposed to be quite inexpensive. Now in
* order to do this the goal is that most functions are not aware of locking.
* Once we have a TCB we lock it and unlock when we are through. This means
* that the TCB lock is kind-of a "global" lock when working on an
* association. Caution must be used when asserting a TCB_LOCK since if we
* recurse we deadlock.
*
* Most other locks (INP and INFO) attempt to localize the locking i.e. we try
* to contain the lock and unlock within the function that needs to lock it.
* This sometimes mean we do extra locks and unlocks and lose a bit of
* efficency, but if the performance statements about non-recursive locks are
* true this should not be a problem. One issue that arises with this only
* lock when needed is that if an implicit association setup is done we have
* a problem. If at the time I lookup an association I have NULL in the tcb
* return, by the time I call to create the association some other processor
* could have created it. This is what the CREATE lock on the endpoint.
* Places where we will be implicitly creating the association OR just
* creating an association (the connect call) will assert the CREATE_INP
* lock. This will assure us that during all the lookup of INP and INFO if
* another creator is also locking/looking up we can gate the two to
* synchronize. So the CREATE_INP lock is also another one we must use
* extreme caution in locking to make sure we don't hit a re-entrancy issue.
*
* For non FreeBSD 5.x we provide a bunch of EMPTY lock macros so we can
* blatantly put locks everywhere and they reduce to nothing on
* NetBSD/OpenBSD and FreeBSD 4.x
*
*/
/*
* When working with the global SCTP lists we lock and unlock the INP_INFO
* lock. So when we go to lookup an association we will want to do a
* SCTP_INP_INFO_RLOCK() and then when we want to add a new association to
* the SCTP_BASE_INFO() list's we will do a SCTP_INP_INFO_WLOCK().
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
extern struct sctp_foo_stuff sctp_logoff[];
extern int sctp_logoff_stuff;
#define SCTP_IPI_COUNT_INIT()
#define SCTP_STATLOG_INIT_LOCK()
#define SCTP_STATLOG_LOCK()
#define SCTP_STATLOG_UNLOCK()
#define SCTP_STATLOG_DESTROY()
#define SCTP_INP_INFO_LOCK_DESTROY() do { \
if(rw_wowned(&SCTP_BASE_INFO(ipi_ep_mtx))) { \
rw_wunlock(&SCTP_BASE_INFO(ipi_ep_mtx)); \
} \
rw_destroy(&SCTP_BASE_INFO(ipi_ep_mtx)); \
} while (0)
#define SCTP_INP_INFO_LOCK_INIT() \
rw_init(&SCTP_BASE_INFO(ipi_ep_mtx), "sctp-info");
#define SCTP_INP_INFO_RLOCK() do { \
rw_rlock(&SCTP_BASE_INFO(ipi_ep_mtx)); \
} while (0)
#define SCTP_INP_INFO_WLOCK() do { \
rw_wlock(&SCTP_BASE_INFO(ipi_ep_mtx)); \
} while (0)
#define SCTP_INP_INFO_RUNLOCK() rw_runlock(&SCTP_BASE_INFO(ipi_ep_mtx))
#define SCTP_INP_INFO_WUNLOCK() rw_wunlock(&SCTP_BASE_INFO(ipi_ep_mtx))
#define SCTP_IPI_ADDR_INIT() \
rw_init(&SCTP_BASE_INFO(ipi_addr_mtx), "sctp-addr")
#define SCTP_IPI_ADDR_DESTROY() do { \
if(rw_wowned(&SCTP_BASE_INFO(ipi_addr_mtx))) { \
rw_wunlock(&SCTP_BASE_INFO(ipi_addr_mtx)); \
} \
rw_destroy(&SCTP_BASE_INFO(ipi_addr_mtx)); \
} while (0)
#define SCTP_IPI_ADDR_RLOCK() do { \
rw_rlock(&SCTP_BASE_INFO(ipi_addr_mtx)); \
} while (0)
#define SCTP_IPI_ADDR_WLOCK() do { \
rw_wlock(&SCTP_BASE_INFO(ipi_addr_mtx)); \
} while (0)
#define SCTP_IPI_ADDR_RUNLOCK() rw_runlock(&SCTP_BASE_INFO(ipi_addr_mtx))
#define SCTP_IPI_ADDR_WUNLOCK() rw_wunlock(&SCTP_BASE_INFO(ipi_addr_mtx))
#define SCTP_IPI_ITERATOR_WQ_INIT() \
mtx_init(&SCTP_BASE_INFO(ipi_iterator_wq_mtx), "sctp-it-wq", "sctp_it_wq", MTX_DEF)
#define SCTP_IPI_ITERATOR_WQ_DESTROY() \
mtx_destroy(&SCTP_BASE_INFO(ipi_iterator_wq_mtx))
#define SCTP_IPI_ITERATOR_WQ_LOCK() do { \
mtx_lock(&SCTP_BASE_INFO(ipi_iterator_wq_mtx)); \
} while (0)
#define SCTP_IPI_ITERATOR_WQ_UNLOCK() mtx_unlock(&SCTP_BASE_INFO(ipi_iterator_wq_mtx))
#define SCTP_IP_PKTLOG_INIT() \
mtx_init(&SCTP_BASE_INFO(ipi_pktlog_mtx), "sctp-pktlog", "packetlog", MTX_DEF)
#define SCTP_IP_PKTLOG_LOCK() do { \
mtx_lock(&SCTP_BASE_INFO(ipi_pktlog_mtx)); \
} while (0)
#define SCTP_IP_PKTLOG_UNLOCK() mtx_unlock(&SCTP_BASE_INFO(ipi_pktlog_mtx))
#define SCTP_IP_PKTLOG_DESTROY() \
mtx_destroy(&SCTP_BASE_INFO(ipi_pktlog_mtx))
/*
* The INP locks we will use for locking an SCTP endpoint, so for example if
* we want to change something at the endpoint level for example random_store
* or cookie secrets we lock the INP level.
*/
#define SCTP_INP_READ_INIT(_inp) \
mtx_init(&(_inp)->inp_rdata_mtx, "sctp-read", "inpr", MTX_DEF | MTX_DUPOK)
#define SCTP_INP_READ_DESTROY(_inp) \
mtx_destroy(&(_inp)->inp_rdata_mtx)
#define SCTP_INP_READ_LOCK(_inp) do { \
mtx_lock(&(_inp)->inp_rdata_mtx); \
} while (0)
#define SCTP_INP_READ_UNLOCK(_inp) mtx_unlock(&(_inp)->inp_rdata_mtx)
#define SCTP_INP_LOCK_INIT(_inp) \
mtx_init(&(_inp)->inp_mtx, "sctp-inp", "inp", MTX_DEF | MTX_DUPOK)
#define SCTP_ASOC_CREATE_LOCK_INIT(_inp) \
mtx_init(&(_inp)->inp_create_mtx, "sctp-create", "inp_create", \
MTX_DEF | MTX_DUPOK)
#define SCTP_INP_LOCK_DESTROY(_inp) \
mtx_destroy(&(_inp)->inp_mtx)
#define SCTP_ASOC_CREATE_LOCK_DESTROY(_inp) \
mtx_destroy(&(_inp)->inp_create_mtx)
#ifdef SCTP_LOCK_LOGGING
#define SCTP_INP_RLOCK(_inp) do { \
if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_INP);\
mtx_lock(&(_inp)->inp_mtx); \
} while (0)
#define SCTP_INP_WLOCK(_inp) do { \
if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_INP);\
mtx_lock(&(_inp)->inp_mtx); \
} while (0)
#else
#define SCTP_INP_RLOCK(_inp) do { \
mtx_lock(&(_inp)->inp_mtx); \
} while (0)
#define SCTP_INP_WLOCK(_inp) do { \
mtx_lock(&(_inp)->inp_mtx); \
} while (0)
#endif
#define SCTP_TCB_SEND_LOCK_INIT(_tcb) \
mtx_init(&(_tcb)->tcb_send_mtx, "sctp-send-tcb", "tcbs", MTX_DEF | MTX_DUPOK)
#define SCTP_TCB_SEND_LOCK_DESTROY(_tcb) mtx_destroy(&(_tcb)->tcb_send_mtx)
#define SCTP_TCB_SEND_LOCK(_tcb) do { \
mtx_lock(&(_tcb)->tcb_send_mtx); \
} while (0)
#define SCTP_TCB_SEND_UNLOCK(_tcb) mtx_unlock(&(_tcb)->tcb_send_mtx)
#define SCTP_INP_INCR_REF(_inp) atomic_add_int(&((_inp)->refcount), 1)
#define SCTP_INP_DECR_REF(_inp) atomic_add_int(&((_inp)->refcount), -1)
#ifdef SCTP_LOCK_LOGGING
#define SCTP_ASOC_CREATE_LOCK(_inp) \
do { \
if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) sctp_log_lock(_inp, (struct sctp_tcb *)NULL, SCTP_LOG_LOCK_CREATE); \
mtx_lock(&(_inp)->inp_create_mtx); \
} while (0)
#else
#define SCTP_ASOC_CREATE_LOCK(_inp) \
do { \
mtx_lock(&(_inp)->inp_create_mtx); \
} while (0)
#endif
#define SCTP_INP_RUNLOCK(_inp) mtx_unlock(&(_inp)->inp_mtx)
#define SCTP_INP_WUNLOCK(_inp) mtx_unlock(&(_inp)->inp_mtx)
#define SCTP_ASOC_CREATE_UNLOCK(_inp) mtx_unlock(&(_inp)->inp_create_mtx)
/*
* For the majority of things (once we have found the association) we will
* lock the actual association mutex. This will protect all the assoiciation
* level queues and streams and such. We will need to lock the socket layer
* when we stuff data up into the receiving sb_mb. I.e. we will need to do an
* extra SOCKBUF_LOCK(&so->so_rcv) even though the association is locked.
*/
#define SCTP_TCB_LOCK_INIT(_tcb) \
mtx_init(&(_tcb)->tcb_mtx, "sctp-tcb", "tcb", MTX_DEF | MTX_DUPOK)
#define SCTP_TCB_LOCK_DESTROY(_tcb) mtx_destroy(&(_tcb)->tcb_mtx)
#ifdef SCTP_LOCK_LOGGING
#define SCTP_TCB_LOCK(_tcb) do { \
if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LOCK_LOGGING_ENABLE) sctp_log_lock(_tcb->sctp_ep, _tcb, SCTP_LOG_LOCK_TCB); \
mtx_lock(&(_tcb)->tcb_mtx); \
} while (0)
#else
#define SCTP_TCB_LOCK(_tcb) do { \
mtx_lock(&(_tcb)->tcb_mtx); \
} while (0)
#endif
#define SCTP_TCB_TRYLOCK(_tcb) mtx_trylock(&(_tcb)->tcb_mtx)
#define SCTP_TCB_UNLOCK(_tcb) mtx_unlock(&(_tcb)->tcb_mtx)
#define SCTP_TCB_UNLOCK_IFOWNED(_tcb) do { \
if (mtx_owned(&(_tcb)->tcb_mtx)) \
mtx_unlock(&(_tcb)->tcb_mtx); \
} while (0)
#ifdef INVARIANTS
#define SCTP_TCB_LOCK_ASSERT(_tcb) do { \
if (mtx_owned(&(_tcb)->tcb_mtx) == 0) \
panic("Don't own TCB lock"); \
} while (0)
#else
#define SCTP_TCB_LOCK_ASSERT(_tcb)
#endif
#define SCTP_ITERATOR_LOCK_INIT() \
mtx_init(&SCTP_BASE_INFO(it_mtx), "sctp-it", "iterator", MTX_DEF)
#ifdef INVARIANTS
#define SCTP_ITERATOR_LOCK() \
do { \
if (mtx_owned(&SCTP_BASE_INFO(it_mtx))) \
panic("Iterator Lock"); \
mtx_lock(&SCTP_BASE_INFO(it_mtx)); \
} while (0)
#else
#define SCTP_ITERATOR_LOCK() \
do { \
mtx_lock(&SCTP_BASE_INFO(it_mtx)); \
} while (0)
#endif
#define SCTP_ITERATOR_UNLOCK() mtx_unlock(&SCTP_BASE_INFO(it_mtx))
#define SCTP_ITERATOR_LOCK_DESTROY() mtx_destroy(&SCTP_BASE_INFO(it_mtx))
#define SCTP_INCR_EP_COUNT() \
do { \
atomic_add_int(&SCTP_BASE_INFO(ipi_count_ep), 1); \
} while (0)
#define SCTP_DECR_EP_COUNT() \
do { \
atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_ep), 1); \
} while (0)
#define SCTP_INCR_ASOC_COUNT() \
do { \
atomic_add_int(&SCTP_BASE_INFO(ipi_count_asoc), 1); \
} while (0)
#define SCTP_DECR_ASOC_COUNT() \
do { \
atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_asoc), 1); \
} while (0)
#define SCTP_INCR_LADDR_COUNT() \
do { \
atomic_add_int(&SCTP_BASE_INFO(ipi_count_laddr), 1); \
} while (0)
#define SCTP_DECR_LADDR_COUNT() \
do { \
atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_laddr), 1); \
} while (0)
#define SCTP_INCR_RADDR_COUNT() \
do { \
atomic_add_int(&SCTP_BASE_INFO(ipi_count_raddr), 1); \
} while (0)
#define SCTP_DECR_RADDR_COUNT() \
do { \
atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_raddr),1); \
} while (0)
#define SCTP_INCR_CHK_COUNT() \
do { \
atomic_add_int(&SCTP_BASE_INFO(ipi_count_chunk), 1); \
} while (0)
#ifdef INVARIANTS
#define SCTP_DECR_CHK_COUNT() \
do { \
if(SCTP_BASE_INFO(ipi_count_chunk) == 0) \
panic("chunk count to 0?"); \
atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_chunk), 1); \
} while (0)
#else
#define SCTP_DECR_CHK_COUNT() \
do { \
if(SCTP_BASE_INFO(ipi_count_chunk) != 0) \
atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_chunk), 1); \
} while (0)
#endif
#define SCTP_INCR_READQ_COUNT() \
do { \
atomic_add_int(&SCTP_BASE_INFO(ipi_count_readq),1); \
} while (0)
#define SCTP_DECR_READQ_COUNT() \
do { \
atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_readq), 1); \
} while (0)
#define SCTP_INCR_STRMOQ_COUNT() \
do { \
atomic_add_int(&SCTP_BASE_INFO(ipi_count_strmoq), 1); \
} while (0)
#define SCTP_DECR_STRMOQ_COUNT() \
do { \
atomic_subtract_int(&SCTP_BASE_INFO(ipi_count_strmoq), 1); \
} while (0)
#if defined(SCTP_SO_LOCK_TESTING)
#define SCTP_INP_SO(sctpinp) (sctpinp)->ip_inp.inp.inp_socket
#define SCTP_SOCKET_LOCK(so, refcnt)
#define SCTP_SOCKET_UNLOCK(so, refcnt)
#endif
#endif
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