The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_os_bsd.h

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    1 /*-
    2  * Copyright (c) 2006-2007, by Cisco Systems, Inc. All rights reserved.
    3  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions are met:
    8  *
    9  * a) Redistributions of source code must retain the above copyright notice,
   10  *   this list of conditions and the following disclaimer.
   11  *
   12  * b) Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in
   14  *   the documentation and/or other materials provided with the distribution.
   15  *
   16  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   17  *    contributors may be used to endorse or promote products derived
   18  *    from this software without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   22  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   24  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   30  * THE POSSIBILITY OF SUCH DAMAGE.
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/10.3/sys/netinet/sctp_os_bsd.h 294142 2016-01-16 12:33:45Z tuexen $");
   35 
   36 #ifndef _NETINET_SCTP_OS_BSD_H_
   37 #define _NETINET_SCTP_OS_BSD_H_
   38 /*
   39  * includes
   40  */
   41 #include "opt_ipsec.h"
   42 #include "opt_compat.h"
   43 #include "opt_inet6.h"
   44 #include "opt_inet.h"
   45 #include "opt_sctp.h"
   46 
   47 #include <sys/param.h>
   48 #include <sys/ktr.h>
   49 #include <sys/systm.h>
   50 #include <sys/malloc.h>
   51 #include <sys/kernel.h>
   52 #include <sys/sysctl.h>
   53 #include <sys/mbuf.h>
   54 #include <sys/protosw.h>
   55 #include <sys/socket.h>
   56 #include <sys/socketvar.h>
   57 #include <sys/jail.h>
   58 #include <sys/sysctl.h>
   59 #include <sys/resourcevar.h>
   60 #include <sys/uio.h>
   61 #include <sys/lock.h>
   62 #include <sys/rwlock.h>
   63 #include <sys/kthread.h>
   64 #include <sys/priv.h>
   65 #include <sys/random.h>
   66 #include <sys/limits.h>
   67 #include <sys/queue.h>
   68 #include <machine/cpu.h>
   69 
   70 #include <net/if.h>
   71 #include <net/if_types.h>
   72 #include <net/if_var.h>
   73 #include <net/route.h>
   74 #include <net/vnet.h>
   75 
   76 #include <netinet/in.h>
   77 #include <netinet/in_systm.h>
   78 #include <netinet/ip.h>
   79 #include <netinet/in_pcb.h>
   80 #include <netinet/in_var.h>
   81 #include <netinet/ip_var.h>
   82 #include <netinet/ip_icmp.h>
   83 #include <netinet/icmp_var.h>
   84 
   85 #ifdef IPSEC
   86 #include <netipsec/ipsec.h>
   87 #include <netipsec/key.h>
   88 #endif                          /* IPSEC */
   89 
   90 #ifdef INET6
   91 #include <sys/domain.h>
   92 #ifdef IPSEC
   93 #include <netipsec/ipsec6.h>
   94 #endif
   95 #include <netinet/ip6.h>
   96 #include <netinet6/ip6_var.h>
   97 #include <netinet6/in6_pcb.h>
   98 #include <netinet6/ip6protosw.h>
   99 #include <netinet6/nd6.h>
  100 #include <netinet6/scope6_var.h>
  101 #endif                          /* INET6 */
  102 
  103 
  104 #include <netinet/ip_options.h>
  105 
  106 #include <crypto/sha1.h>
  107 #include <crypto/sha2/sha2.h>
  108 
  109 #ifndef in6pcb
  110 #define in6pcb          inpcb
  111 #endif
  112 /* Declare all the malloc names for all the various mallocs */
  113 MALLOC_DECLARE(SCTP_M_MAP);
  114 MALLOC_DECLARE(SCTP_M_STRMI);
  115 MALLOC_DECLARE(SCTP_M_STRMO);
  116 MALLOC_DECLARE(SCTP_M_ASC_ADDR);
  117 MALLOC_DECLARE(SCTP_M_ASC_IT);
  118 MALLOC_DECLARE(SCTP_M_AUTH_CL);
  119 MALLOC_DECLARE(SCTP_M_AUTH_KY);
  120 MALLOC_DECLARE(SCTP_M_AUTH_HL);
  121 MALLOC_DECLARE(SCTP_M_AUTH_IF);
  122 MALLOC_DECLARE(SCTP_M_STRESET);
  123 MALLOC_DECLARE(SCTP_M_CMSG);
  124 MALLOC_DECLARE(SCTP_M_COPYAL);
  125 MALLOC_DECLARE(SCTP_M_VRF);
  126 MALLOC_DECLARE(SCTP_M_IFA);
  127 MALLOC_DECLARE(SCTP_M_IFN);
  128 MALLOC_DECLARE(SCTP_M_TIMW);
  129 MALLOC_DECLARE(SCTP_M_MVRF);
  130 MALLOC_DECLARE(SCTP_M_ITER);
  131 MALLOC_DECLARE(SCTP_M_SOCKOPT);
  132 MALLOC_DECLARE(SCTP_M_MCORE);
  133 
  134 #if defined(SCTP_LOCAL_TRACE_BUF)
  135 
  136 #define SCTP_GET_CYCLECOUNT get_cyclecount()
  137 #define SCTP_CTR6 sctp_log_trace
  138 
  139 #else
  140 #define SCTP_CTR6 CTR6
  141 #endif
  142 
  143 /*
  144  * Macros to expand out globals defined by various modules
  145  * to either a real global or a virtualized instance of one,
  146  * depending on whether VIMAGE is defined.
  147  */
  148 /* then define the macro(s) that hook into the vimage macros */
  149 #define MODULE_GLOBAL(__SYMBOL) V_##__SYMBOL
  150 
  151 #define V_system_base_info VNET(system_base_info)
  152 #define SCTP_BASE_INFO(__m) V_system_base_info.sctppcbinfo.__m
  153 #define SCTP_BASE_STATS V_system_base_info.sctpstat
  154 #define SCTP_BASE_STAT(__m) V_system_base_info.sctpstat.__m
  155 #define SCTP_BASE_SYSCTL(__m) V_system_base_info.sctpsysctl.__m
  156 #define SCTP_BASE_VAR(__m) V_system_base_info.__m
  157 
  158 #define SCTP_PRINTF(params...)  printf(params)
  159 #if defined(SCTP_DEBUG)
  160 #define SCTPDBG(level, params...)                                       \
  161 {                                                                       \
  162         do {                                                            \
  163                 if (SCTP_BASE_SYSCTL(sctp_debug_on) & level ) {         \
  164                         SCTP_PRINTF(params);                            \
  165                 }                                                       \
  166         } while (0);                                                    \
  167 }
  168 #define SCTPDBG_ADDR(level, addr)                                       \
  169 {                                                                       \
  170         do {                                                            \
  171                 if (SCTP_BASE_SYSCTL(sctp_debug_on) & level ) {         \
  172                         sctp_print_address(addr);                       \
  173                 }                                                       \
  174         } while (0);                                                    \
  175 }
  176 #else
  177 #define SCTPDBG(level, params...)
  178 #define SCTPDBG_ADDR(level, addr)
  179 #endif
  180 
  181 #ifdef SCTP_LTRACE_CHUNKS
  182 #define SCTP_LTRACE_CHK(a, b, c, d) if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LTRACE_CHUNK_ENABLE) SCTP_CTR6(KTR_SUBSYS, "SCTP:%d[%d]:%x-%x-%x-%x", SCTP_LOG_CHUNK_PROC, 0, a, b, c, d)
  183 #else
  184 #define SCTP_LTRACE_CHK(a, b, c, d)
  185 #endif
  186 
  187 #ifdef SCTP_LTRACE_ERRORS
  188 #define SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, file, err) \
  189         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LTRACE_ERROR_ENABLE) \
  190                 SCTP_PRINTF("mbuf:%p inp:%p stcb:%p net:%p file:%x line:%d error:%d\n", \
  191                             m, inp, stcb, net, file, __LINE__, err);
  192 #define SCTP_LTRACE_ERR_RET(inp, stcb, net, file, err) \
  193         if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LTRACE_ERROR_ENABLE) \
  194                 SCTP_PRINTF("inp:%p stcb:%p net:%p file:%x line:%d error:%d\n", \
  195                             inp, stcb, net, file, __LINE__, err);
  196 #else
  197 #define SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, file, err)
  198 #define SCTP_LTRACE_ERR_RET(inp, stcb, net, file, err)
  199 #endif
  200 
  201 
  202 /*
  203  * Local address and interface list handling
  204  */
  205 #define SCTP_MAX_VRF_ID         0
  206 #define SCTP_SIZE_OF_VRF_HASH   3
  207 #define SCTP_IFNAMSIZ           IFNAMSIZ
  208 #define SCTP_DEFAULT_VRFID      0
  209 #define SCTP_VRF_ADDR_HASH_SIZE 16
  210 #define SCTP_VRF_IFN_HASH_SIZE  3
  211 #define SCTP_INIT_VRF_TABLEID(vrf)
  212 
  213 #define SCTP_IFN_IS_IFT_LOOP(ifn) ((ifn)->ifn_type == IFT_LOOP)
  214 #define SCTP_ROUTE_IS_REAL_LOOP(ro) ((ro)->ro_rt && (ro)->ro_rt->rt_ifa && (ro)->ro_rt->rt_ifa->ifa_ifp && (ro)->ro_rt->rt_ifa->ifa_ifp->if_type == IFT_LOOP)
  215 
  216 /*
  217  * Access to IFN's to help with src-addr-selection
  218  */
  219 /* This could return VOID if the index works but for BSD we provide both. */
  220 #define SCTP_GET_IFN_VOID_FROM_ROUTE(ro) (void *)ro->ro_rt->rt_ifp
  221 #define SCTP_GET_IF_INDEX_FROM_ROUTE(ro) (ro)->ro_rt->rt_ifp->if_index
  222 #define SCTP_ROUTE_HAS_VALID_IFN(ro) ((ro)->ro_rt && (ro)->ro_rt->rt_ifp)
  223 
  224 /*
  225  * general memory allocation
  226  */
  227 #define SCTP_MALLOC(var, type, size, name) \
  228         do { \
  229                 var = (type)malloc(size, name, M_NOWAIT); \
  230         } while (0)
  231 
  232 #define SCTP_FREE(var, type)    free(var, type)
  233 
  234 #define SCTP_MALLOC_SONAME(var, type, size) \
  235         do { \
  236                 var = (type)malloc(size, M_SONAME, M_WAITOK | M_ZERO); \
  237         } while (0)
  238 
  239 #define SCTP_FREE_SONAME(var)   free(var, M_SONAME)
  240 
  241 #define SCTP_PROCESS_STRUCT struct proc *
  242 
  243 /*
  244  * zone allocation functions
  245  */
  246 #include <vm/uma.h>
  247 
  248 /* SCTP_ZONE_INIT: initialize the zone */
  249 typedef struct uma_zone *sctp_zone_t;
  250 
  251 #define SCTP_ZONE_INIT(zone, name, size, number) { \
  252         zone = uma_zcreate(name, size, NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,\
  253                 0); \
  254         uma_zone_set_max(zone, number); \
  255 }
  256 
  257 #define SCTP_ZONE_DESTROY(zone) uma_zdestroy(zone)
  258 
  259 /* SCTP_ZONE_GET: allocate element from the zone */
  260 #define SCTP_ZONE_GET(zone, type) \
  261         (type *)uma_zalloc(zone, M_NOWAIT);
  262 
  263 /* SCTP_ZONE_FREE: free element from the zone */
  264 #define SCTP_ZONE_FREE(zone, element) \
  265         uma_zfree(zone, element);
  266 
  267 #define SCTP_HASH_INIT(size, hashmark) hashinit_flags(size, M_PCB, hashmark, HASH_NOWAIT)
  268 #define SCTP_HASH_FREE(table, hashmark) hashdestroy(table, M_PCB, hashmark)
  269 
  270 #define SCTP_M_COPYM    m_copym
  271 
  272 /*
  273  * timers
  274  */
  275 #include <sys/callout.h>
  276 typedef struct callout sctp_os_timer_t;
  277 
  278 
  279 #define SCTP_OS_TIMER_INIT(tmr) callout_init(tmr, 1)
  280 #define SCTP_OS_TIMER_START     callout_reset
  281 #define SCTP_OS_TIMER_STOP      callout_stop
  282 #define SCTP_OS_TIMER_STOP_DRAIN callout_drain
  283 #define SCTP_OS_TIMER_PENDING   callout_pending
  284 #define SCTP_OS_TIMER_ACTIVE    callout_active
  285 #define SCTP_OS_TIMER_DEACTIVATE callout_deactivate
  286 
  287 #define sctp_get_tick_count() (ticks)
  288 
  289 #define SCTP_UNUSED __attribute__((unused))
  290 
  291 /*
  292  * Functions
  293  */
  294 /* Mbuf manipulation and access macros  */
  295 #define SCTP_BUF_LEN(m) (m->m_len)
  296 #define SCTP_BUF_NEXT(m) (m->m_next)
  297 #define SCTP_BUF_NEXT_PKT(m) (m->m_nextpkt)
  298 #define SCTP_BUF_RESV_UF(m, size) m->m_data += size
  299 #define SCTP_BUF_AT(m, size) m->m_data + size
  300 #define SCTP_BUF_IS_EXTENDED(m) (m->m_flags & M_EXT)
  301 #define SCTP_BUF_EXTEND_SIZE(m) (m->m_ext.ext_size)
  302 #define SCTP_BUF_TYPE(m) (m->m_type)
  303 #define SCTP_BUF_RECVIF(m) (m->m_pkthdr.rcvif)
  304 #define SCTP_BUF_PREPEND        M_PREPEND
  305 
  306 #define SCTP_ALIGN_TO_END(m, len) if(m->m_flags & M_PKTHDR) { \
  307                                      MH_ALIGN(m, len); \
  308                                   } else if ((m->m_flags & M_EXT) == 0) { \
  309                                      M_ALIGN(m, len); \
  310                                   }
  311 
  312 /* We make it so if you have up to 4 threads
  313  * writing based on the default size of
  314  * the packet log 65 k, that would be
  315  * 4 16k packets before we would hit
  316  * a problem.
  317  */
  318 #define SCTP_PKTLOG_WRITERS_NEED_LOCK 3
  319 
  320 /*************************/
  321 /*      MTU              */
  322 /*************************/
  323 #define SCTP_GATHER_MTU_FROM_IFN_INFO(ifn, ifn_index, af) ((struct ifnet *)ifn)->if_mtu
  324 #define SCTP_GATHER_MTU_FROM_ROUTE(sctp_ifa, sa, rt) ((uint32_t)((rt != NULL) ? rt->rt_mtu : 0))
  325 #define SCTP_GATHER_MTU_FROM_INTFC(sctp_ifn) ((sctp_ifn->ifn_p != NULL) ? ((struct ifnet *)(sctp_ifn->ifn_p))->if_mtu : 0)
  326 #define SCTP_SET_MTU_OF_ROUTE(sa, rt, mtu) do { \
  327                                               if (rt != NULL) \
  328                                                  rt->rt_mtu = mtu; \
  329                                            } while(0)
  330 
  331 /* (de-)register interface event notifications */
  332 #define SCTP_REGISTER_INTERFACE(ifhandle, af)
  333 #define SCTP_DEREGISTER_INTERFACE(ifhandle, af)
  334 
  335 
  336 /*************************/
  337 /* These are for logging */
  338 /*************************/
  339 /* return the base ext data pointer */
  340 #define SCTP_BUF_EXTEND_BASE(m) (m->m_ext.ext_buf)
  341  /* return the refcnt of the data pointer */
  342 #define SCTP_BUF_EXTEND_REFCNT(m) (*m->m_ext.ref_cnt)
  343 /* return any buffer related flags, this is
  344  * used beyond logging for apple only.
  345  */
  346 #define SCTP_BUF_GET_FLAGS(m) (m->m_flags)
  347 
  348 /* For BSD this just accesses the M_PKTHDR length
  349  * so it operates on an mbuf with hdr flag. Other
  350  * O/S's may have separate packet header and mbuf
  351  * chain pointers.. thus the macro.
  352  */
  353 #define SCTP_HEADER_TO_CHAIN(m) (m)
  354 #define SCTP_DETACH_HEADER_FROM_CHAIN(m)
  355 #define SCTP_HEADER_LEN(m) ((m)->m_pkthdr.len)
  356 #define SCTP_GET_HEADER_FOR_OUTPUT(o_pak) 0
  357 #define SCTP_RELEASE_HEADER(m)
  358 #define SCTP_RELEASE_PKT(m)     sctp_m_freem(m)
  359 #define SCTP_ENABLE_UDP_CSUM(m) do { \
  360                                         m->m_pkthdr.csum_flags = CSUM_UDP; \
  361                                         m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); \
  362                                 } while (0)
  363 
  364 #define SCTP_GET_PKT_VRFID(m, vrf_id)  ((vrf_id = SCTP_DEFAULT_VRFID) != SCTP_DEFAULT_VRFID)
  365 
  366 
  367 
  368 /* Attach the chain of data into the sendable packet. */
  369 #define SCTP_ATTACH_CHAIN(pak, m, packet_length) do { \
  370                                                  pak = m; \
  371                                                  pak->m_pkthdr.len = packet_length; \
  372                          } while(0)
  373 
  374 /* Other m_pkthdr type things */
  375 #define SCTP_IS_IT_BROADCAST(dst, m) ((m->m_flags & M_PKTHDR) ? in_broadcast(dst, m->m_pkthdr.rcvif) : 0)
  376 #define SCTP_IS_IT_LOOPBACK(m) ((m->m_flags & M_PKTHDR) && ((m->m_pkthdr.rcvif == NULL) || (m->m_pkthdr.rcvif->if_type == IFT_LOOP)))
  377 
  378 
  379 /* This converts any input packet header
  380  * into the chain of data holders, for BSD
  381  * its a NOP.
  382  */
  383 
  384 /* get the v6 hop limit */
  385 #define SCTP_GET_HLIM(inp, ro)  in6_selecthlim((struct in6pcb *)&inp->ip_inp.inp, (ro ? (ro->ro_rt ? (ro->ro_rt->rt_ifp) : (NULL)) : (NULL)));
  386 
  387 /* is the endpoint v6only? */
  388 #define SCTP_IPV6_V6ONLY(inp)   (((struct inpcb *)inp)->inp_flags & IN6P_IPV6_V6ONLY)
  389 /* is the socket non-blocking? */
  390 #define SCTP_SO_IS_NBIO(so)     ((so)->so_state & SS_NBIO)
  391 #define SCTP_SET_SO_NBIO(so)    ((so)->so_state |= SS_NBIO)
  392 #define SCTP_CLEAR_SO_NBIO(so)  ((so)->so_state &= ~SS_NBIO)
  393 /* get the socket type */
  394 #define SCTP_SO_TYPE(so)        ((so)->so_type)
  395 /* reserve sb space for a socket */
  396 #define SCTP_SORESERVE(so, send, recv)  soreserve(so, send, recv)
  397 /* wakeup a socket */
  398 #define SCTP_SOWAKEUP(so)       wakeup(&(so)->so_timeo)
  399 /* clear the socket buffer state */
  400 #define SCTP_SB_CLEAR(sb)       \
  401         (sb).sb_cc = 0;         \
  402         (sb).sb_mb = NULL;      \
  403         (sb).sb_mbcnt = 0;
  404 
  405 #define SCTP_SB_LIMIT_RCV(so) so->so_rcv.sb_hiwat
  406 #define SCTP_SB_LIMIT_SND(so) so->so_snd.sb_hiwat
  407 
  408 /*
  409  * routes, output, etc.
  410  */
  411 typedef struct route sctp_route_t;
  412 typedef struct rtentry sctp_rtentry_t;
  413 
  414 #define SCTP_RTALLOC(ro, vrf_id, fibnum) \
  415         rtalloc_ign_fib((struct route *)ro, 0UL, fibnum)
  416 
  417 /* Future zero copy wakeup/send  function */
  418 #define SCTP_ZERO_COPY_EVENT(inp, so)
  419 /* This is re-pulse ourselves for sendbuf */
  420 #define SCTP_ZERO_COPY_SENDQ_EVENT(inp, so)
  421 
  422 /*
  423  * SCTP protocol specific mbuf flags.
  424  */
  425 #define M_NOTIFICATION          M_PROTO1        /* SCTP notification */
  426 
  427 /*
  428  * IP output routines
  429  */
  430 #define SCTP_IP_OUTPUT(result, o_pak, ro, stcb, vrf_id) \
  431 { \
  432         int o_flgs = IP_RAWOUTPUT; \
  433         struct sctp_tcb *local_stcb = stcb; \
  434         if (local_stcb && \
  435             local_stcb->sctp_ep && \
  436             local_stcb->sctp_ep->sctp_socket) \
  437                 o_flgs |= local_stcb->sctp_ep->sctp_socket->so_options & SO_DONTROUTE; \
  438         m_clrprotoflags(o_pak); \
  439         result = ip_output(o_pak, NULL, ro, o_flgs, 0, NULL); \
  440 }
  441 
  442 #define SCTP_IP6_OUTPUT(result, o_pak, ro, ifp, stcb, vrf_id) \
  443 { \
  444         struct sctp_tcb *local_stcb = stcb; \
  445         m_clrprotoflags(o_pak); \
  446         if (local_stcb && local_stcb->sctp_ep) \
  447                 result = ip6_output(o_pak, \
  448                                     ((struct in6pcb *)(local_stcb->sctp_ep))->in6p_outputopts, \
  449                                     (ro), 0, 0, ifp, NULL); \
  450         else \
  451                 result = ip6_output(o_pak, NULL, (ro), 0, 0, ifp, NULL); \
  452 }
  453 
  454 struct mbuf *
  455 sctp_get_mbuf_for_msg(unsigned int space_needed,
  456     int want_header, int how, int allonebuf, int type);
  457 
  458 
  459 /*
  460  * SCTP AUTH
  461  */
  462 #define SCTP_READ_RANDOM(buf, len)      read_random(buf, len)
  463 
  464 /* map standard crypto API names */
  465 #define SCTP_SHA1_CTX           SHA1_CTX
  466 #define SCTP_SHA1_INIT          SHA1Init
  467 #define SCTP_SHA1_UPDATE        SHA1Update
  468 #define SCTP_SHA1_FINAL(x,y)    SHA1Final((caddr_t)x, y)
  469 
  470 #define SCTP_SHA256_CTX         SHA256_CTX
  471 #define SCTP_SHA256_INIT        SHA256_Init
  472 #define SCTP_SHA256_UPDATE      SHA256_Update
  473 #define SCTP_SHA256_FINAL(x,y)  SHA256_Final((caddr_t)x, y)
  474 
  475 #endif
  476 
  477 #define SCTP_DECREMENT_AND_CHECK_REFCOUNT(addr) (atomic_fetchadd_int(addr, -1) == 1)
  478 #if defined(INVARIANTS)
  479 #define SCTP_SAVE_ATOMIC_DECREMENT(addr, val) \
  480 { \
  481         int32_t oldval; \
  482         oldval = atomic_fetchadd_int(addr, -val); \
  483         if (oldval < val) { \
  484                 panic("Counter goes negative"); \
  485         } \
  486 }
  487 #else
  488 #define SCTP_SAVE_ATOMIC_DECREMENT(addr, val) \
  489 { \
  490         int32_t oldval; \
  491         oldval = atomic_fetchadd_int(addr, -val); \
  492         if (oldval < val) { \
  493                 *addr = 0; \
  494         } \
  495 }
  496 #endif

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