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) 2008-2011, by Randall Stewart. All rights reserved.
    4  * Copyright (c) 2008-2011, 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 #include <sys/cdefs.h>
   33 __FBSDID("$FreeBSD: releng/9.0/sys/netinet/sctp_os_bsd.h 221251 2011-04-30 11:22:30Z tuexen $");
   34 #ifndef __sctp_os_bsd_h__
   35 #define __sctp_os_bsd_h__
   36 /*
   37  * includes
   38  */
   39 #include "opt_ipsec.h"
   40 #include "opt_compat.h"
   41 #include "opt_inet6.h"
   42 #include "opt_inet.h"
   43 #include "opt_sctp.h"
   44 
   45 #include <sys/param.h>
   46 #include <sys/ktr.h>
   47 #include <sys/systm.h>
   48 #include <sys/malloc.h>
   49 #include <sys/kernel.h>
   50 #include <sys/sysctl.h>
   51 #include <sys/mbuf.h>
   52 #include <sys/protosw.h>
   53 #include <sys/socket.h>
   54 #include <sys/socketvar.h>
   55 #include <sys/jail.h>
   56 #include <sys/sysctl.h>
   57 #include <sys/resourcevar.h>
   58 #include <sys/uio.h>
   59 #include <sys/lock.h>
   60 #include <sys/rwlock.h>
   61 #include <sys/kthread.h>
   62 #include <sys/priv.h>
   63 #include <sys/random.h>
   64 #include <sys/limits.h>
   65 #include <sys/queue.h>
   66 #include <machine/cpu.h>
   67 
   68 #include <net/if.h>
   69 #include <net/if_types.h>
   70 #include <net/if_var.h>
   71 #include <net/route.h>
   72 #include <net/vnet.h>
   73 
   74 #include <netinet/in.h>
   75 #include <netinet/in_systm.h>
   76 #include <netinet/ip.h>
   77 #include <netinet/in_pcb.h>
   78 #include <netinet/in_var.h>
   79 #include <netinet/ip_var.h>
   80 #include <netinet/ip_icmp.h>
   81 #include <netinet/icmp_var.h>
   82 
   83 #ifdef IPSEC
   84 #include <netipsec/ipsec.h>
   85 #include <netipsec/key.h>
   86 #endif                          /* IPSEC */
   87 
   88 #ifdef INET6
   89 #include <sys/domain.h>
   90 #ifdef IPSEC
   91 #include <netipsec/ipsec6.h>
   92 #endif
   93 #include <netinet/ip6.h>
   94 #include <netinet6/ip6_var.h>
   95 #include <netinet6/in6_pcb.h>
   96 #include <netinet/icmp6.h>
   97 #include <netinet6/ip6protosw.h>
   98 #include <netinet6/nd6.h>
   99 #include <netinet6/scope6_var.h>
  100 #endif                          /* INET6 */
  101 
  102 
  103 #include <netinet/ip_options.h>
  104 
  105 #ifndef in6pcb
  106 #define in6pcb          inpcb
  107 #endif
  108 /* Declare all the malloc names for all the various mallocs */
  109 MALLOC_DECLARE(SCTP_M_MAP);
  110 MALLOC_DECLARE(SCTP_M_STRMI);
  111 MALLOC_DECLARE(SCTP_M_STRMO);
  112 MALLOC_DECLARE(SCTP_M_ASC_ADDR);
  113 MALLOC_DECLARE(SCTP_M_ASC_IT);
  114 MALLOC_DECLARE(SCTP_M_AUTH_CL);
  115 MALLOC_DECLARE(SCTP_M_AUTH_KY);
  116 MALLOC_DECLARE(SCTP_M_AUTH_HL);
  117 MALLOC_DECLARE(SCTP_M_AUTH_IF);
  118 MALLOC_DECLARE(SCTP_M_STRESET);
  119 MALLOC_DECLARE(SCTP_M_CMSG);
  120 MALLOC_DECLARE(SCTP_M_COPYAL);
  121 MALLOC_DECLARE(SCTP_M_VRF);
  122 MALLOC_DECLARE(SCTP_M_IFA);
  123 MALLOC_DECLARE(SCTP_M_IFN);
  124 MALLOC_DECLARE(SCTP_M_TIMW);
  125 MALLOC_DECLARE(SCTP_M_MVRF);
  126 MALLOC_DECLARE(SCTP_M_ITER);
  127 MALLOC_DECLARE(SCTP_M_SOCKOPT);
  128 MALLOC_DECLARE(SCTP_M_MCORE);
  129 
  130 #if defined(SCTP_LOCAL_TRACE_BUF)
  131 
  132 #define SCTP_GET_CYCLECOUNT get_cyclecount()
  133 #define SCTP_CTR6 sctp_log_trace
  134 
  135 #else
  136 #define SCTP_CTR6 CTR6
  137 #endif
  138 
  139 /*
  140  * Macros to expand out globals defined by various modules
  141  * to either a real global or a virtualized instance of one,
  142  * depending on whether VIMAGE is defined.
  143  */
  144 /* then define the macro(s) that hook into the vimage macros */
  145 #define MODULE_GLOBAL(__SYMBOL) V_##__SYMBOL
  146 
  147 #define V_system_base_info VNET(system_base_info)
  148 #define SCTP_BASE_INFO(__m) V_system_base_info.sctppcbinfo.__m
  149 #define SCTP_BASE_STATS V_system_base_info.sctpstat
  150 #define SCTP_BASE_STATS_SYSCTL VNET_NAME(system_base_info.sctpstat)
  151 #define SCTP_BASE_STAT(__m)     V_system_base_info.sctpstat.__m
  152 #define SCTP_BASE_SYSCTL(__m) VNET_NAME(system_base_info.sctpsysctl.__m)
  153 #define SCTP_BASE_VAR(__m) V_system_base_info.__m
  154 
  155 /*
  156  *
  157  */
  158 #define USER_ADDR_NULL  (NULL)  /* FIX ME: temp */
  159 
  160 #if defined(SCTP_DEBUG)
  161 #define SCTPDBG(level, params...)                                       \
  162 {                                                                       \
  163     do {                                                                \
  164         if (SCTP_BASE_SYSCTL(sctp_debug_on) & level ) {                 \
  165             printf(params);                                             \
  166         }                                                               \
  167     } while (0);                                                        \
  168 }
  169 #define SCTPDBG_ADDR(level, addr)                                       \
  170 {                                                                       \
  171     do {                                                                \
  172         if (SCTP_BASE_SYSCTL(sctp_debug_on) & level ) {                 \
  173             sctp_print_address(addr);                                   \
  174         }                                                               \
  175     } while (0);                                                        \
  176 }
  177 #define SCTPDBG_PKT(level, iph, sh)                                     \
  178 {                                                                       \
  179     do {                                                                \
  180             if (SCTP_BASE_SYSCTL(sctp_debug_on) & level) {              \
  181                     sctp_print_address_pkt(iph, sh);                    \
  182             }                                                           \
  183     } while (0);                                                        \
  184 }
  185 #else
  186 #define SCTPDBG(level, params...)
  187 #define SCTPDBG_ADDR(level, addr)
  188 #define SCTPDBG_PKT(level, iph, sh)
  189 #endif
  190 #define SCTP_PRINTF(params...)  printf(params)
  191 
  192 #ifdef SCTP_LTRACE_CHUNKS
  193 #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)
  194 #else
  195 #define SCTP_LTRACE_CHK(a, b, c, d)
  196 #endif
  197 
  198 #ifdef SCTP_LTRACE_ERRORS
  199 #define SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, file, err) if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LTRACE_ERROR_ENABLE) \
  200                                                          printf("mbuf:%p inp:%p stcb:%p net:%p file:%x line:%d error:%d\n", \
  201                                                                      m, inp, stcb, net, file, __LINE__, err);
  202 #define SCTP_LTRACE_ERR_RET(inp, stcb, net, file, err) if(SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_LTRACE_ERROR_ENABLE) \
  203                                                           printf("inp:%p stcb:%p net:%p file:%x line:%d error:%d\n", \
  204                                                                      inp, stcb, net, file, __LINE__, err);
  205 #else
  206 #define SCTP_LTRACE_ERR_RET_PKT(m, inp, stcb, net, file, err)
  207 #define SCTP_LTRACE_ERR_RET(inp, stcb, net, file, err)
  208 #endif
  209 
  210 
  211 /*
  212  * Local address and interface list handling
  213  */
  214 #define SCTP_MAX_VRF_ID         0
  215 #define SCTP_SIZE_OF_VRF_HASH   3
  216 #define SCTP_IFNAMSIZ           IFNAMSIZ
  217 #define SCTP_DEFAULT_VRFID      0
  218 #define SCTP_VRF_ADDR_HASH_SIZE 16
  219 #define SCTP_VRF_IFN_HASH_SIZE  3
  220 #define SCTP_INIT_VRF_TABLEID(vrf)
  221 
  222 #define SCTP_IFN_IS_IFT_LOOP(ifn) ((ifn)->ifn_type == IFT_LOOP)
  223 #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)
  224 
  225 /*
  226  * Access to IFN's to help with src-addr-selection
  227  */
  228 /* This could return VOID if the index works but for BSD we provide both. */
  229 #define SCTP_GET_IFN_VOID_FROM_ROUTE(ro) (void *)ro->ro_rt->rt_ifp
  230 #define SCTP_GET_IF_INDEX_FROM_ROUTE(ro) (ro)->ro_rt->rt_ifp->if_index
  231 #define SCTP_ROUTE_HAS_VALID_IFN(ro) ((ro)->ro_rt && (ro)->ro_rt->rt_ifp)
  232 
  233 /*
  234  * general memory allocation
  235  */
  236 #define SCTP_MALLOC(var, type, size, name) \
  237     do { \
  238         var = (type)malloc(size, name, M_NOWAIT); \
  239     } while (0)
  240 
  241 #define SCTP_FREE(var, type)    free(var, type)
  242 
  243 #define SCTP_MALLOC_SONAME(var, type, size) \
  244     do { \
  245         var = (type)malloc(size, M_SONAME, M_WAITOK | M_ZERO); \
  246     } while (0)
  247 
  248 #define SCTP_FREE_SONAME(var)   free(var, M_SONAME)
  249 
  250 #define SCTP_PROCESS_STRUCT struct proc *
  251 
  252 /*
  253  * zone allocation functions
  254  */
  255 #include <vm/uma.h>
  256 
  257 /* SCTP_ZONE_INIT: initialize the zone */
  258 typedef struct uma_zone *sctp_zone_t;
  259 
  260 #define SCTP_ZONE_INIT(zone, name, size, number) { \
  261         zone = uma_zcreate(name, size, NULL, NULL, NULL, NULL, UMA_ALIGN_PTR,\
  262                 0); \
  263         uma_zone_set_max(zone, number); \
  264 }
  265 
  266 #define SCTP_ZONE_DESTROY(zone) uma_zdestroy(zone)
  267 
  268 /* SCTP_ZONE_GET: allocate element from the zone */
  269 #define SCTP_ZONE_GET(zone, type) \
  270         (type *)uma_zalloc(zone, M_NOWAIT);
  271 
  272 /* SCTP_ZONE_FREE: free element from the zone */
  273 #define SCTP_ZONE_FREE(zone, element) \
  274         uma_zfree(zone, element);
  275 
  276 #define SCTP_HASH_INIT(size, hashmark) hashinit_flags(size, M_PCB, hashmark, HASH_NOWAIT)
  277 #define SCTP_HASH_FREE(table, hashmark) hashdestroy(table, M_PCB, hashmark)
  278 
  279 #define SCTP_M_COPYM    m_copym
  280 
  281 /*
  282  * timers
  283  */
  284 #include <sys/callout.h>
  285 typedef struct callout sctp_os_timer_t;
  286 
  287 
  288 #define SCTP_OS_TIMER_INIT(tmr) callout_init(tmr, 1)
  289 #define SCTP_OS_TIMER_START     callout_reset
  290 #define SCTP_OS_TIMER_STOP      callout_stop
  291 #define SCTP_OS_TIMER_STOP_DRAIN callout_drain
  292 #define SCTP_OS_TIMER_PENDING   callout_pending
  293 #define SCTP_OS_TIMER_ACTIVE    callout_active
  294 #define SCTP_OS_TIMER_DEACTIVATE callout_deactivate
  295 
  296 #define sctp_get_tick_count() (ticks)
  297 
  298 #define SCTP_UNUSED __attribute__((unused))
  299 
  300 /*
  301  * Functions
  302  */
  303 /* Mbuf manipulation and access macros  */
  304 #define SCTP_BUF_LEN(m) (m->m_len)
  305 #define SCTP_BUF_NEXT(m) (m->m_next)
  306 #define SCTP_BUF_NEXT_PKT(m) (m->m_nextpkt)
  307 #define SCTP_BUF_RESV_UF(m, size) m->m_data += size
  308 #define SCTP_BUF_AT(m, size) m->m_data + size
  309 #define SCTP_BUF_IS_EXTENDED(m) (m->m_flags & M_EXT)
  310 #define SCTP_BUF_EXTEND_SIZE(m) (m->m_ext.ext_size)
  311 #define SCTP_BUF_TYPE(m) (m->m_type)
  312 #define SCTP_BUF_RECVIF(m) (m->m_pkthdr.rcvif)
  313 #define SCTP_BUF_PREPEND        M_PREPEND
  314 
  315 #define SCTP_ALIGN_TO_END(m, len) if(m->m_flags & M_PKTHDR) { \
  316                                      MH_ALIGN(m, len); \
  317                                   } else if ((m->m_flags & M_EXT) == 0) { \
  318                                      M_ALIGN(m, len); \
  319                                   }
  320 
  321 /* We make it so if you have up to 4 threads
  322  * writing based on the default size of
  323  * the packet log 65 k, that would be
  324  * 4 16k packets before we would hit
  325  * a problem.
  326  */
  327 #define SCTP_PKTLOG_WRITERS_NEED_LOCK 3
  328 
  329 /*************************/
  330 /*      MTU              */
  331 /*************************/
  332 #define SCTP_GATHER_MTU_FROM_IFN_INFO(ifn, ifn_index, af) ((struct ifnet *)ifn)->if_mtu
  333 #define SCTP_GATHER_MTU_FROM_ROUTE(sctp_ifa, sa, rt) ((rt != NULL) ? rt->rt_rmx.rmx_mtu : 0)
  334 #define SCTP_GATHER_MTU_FROM_INTFC(sctp_ifn) ((sctp_ifn->ifn_p != NULL) ? ((struct ifnet *)(sctp_ifn->ifn_p))->if_mtu : 0)
  335 #define SCTP_SET_MTU_OF_ROUTE(sa, rt, mtu) do { \
  336                                               if (rt != NULL) \
  337                                                  rt->rt_rmx.rmx_mtu = mtu; \
  338                                            } while(0)
  339 
  340 /* (de-)register interface event notifications */
  341 #define SCTP_REGISTER_INTERFACE(ifhandle, af)
  342 #define SCTP_DEREGISTER_INTERFACE(ifhandle, af)
  343 
  344 
  345 /*************************/
  346 /* These are for logging */
  347 /*************************/
  348 /* return the base ext data pointer */
  349 #define SCTP_BUF_EXTEND_BASE(m) (m->m_ext.ext_buf)
  350  /* return the refcnt of the data pointer */
  351 #define SCTP_BUF_EXTEND_REFCNT(m) (*m->m_ext.ref_cnt)
  352 /* return any buffer related flags, this is
  353  * used beyond logging for apple only.
  354  */
  355 #define SCTP_BUF_GET_FLAGS(m) (m->m_flags)
  356 
  357 /* For BSD this just accesses the M_PKTHDR length
  358  * so it operates on an mbuf with hdr flag. Other
  359  * O/S's may have separate packet header and mbuf
  360  * chain pointers.. thus the macro.
  361  */
  362 #define SCTP_HEADER_TO_CHAIN(m) (m)
  363 #define SCTP_DETACH_HEADER_FROM_CHAIN(m)
  364 #define SCTP_HEADER_LEN(m) (m->m_pkthdr.len)
  365 #define SCTP_GET_HEADER_FOR_OUTPUT(o_pak) 0
  366 #define SCTP_RELEASE_HEADER(m)
  367 #define SCTP_RELEASE_PKT(m)     sctp_m_freem(m)
  368 #define SCTP_ENABLE_UDP_CSUM(m) do { \
  369                                         m->m_pkthdr.csum_flags = CSUM_UDP; \
  370                                         m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); \
  371                                 } while (0)
  372 
  373 #define SCTP_GET_PKT_VRFID(m, vrf_id)  ((vrf_id = SCTP_DEFAULT_VRFID) != SCTP_DEFAULT_VRFID)
  374 
  375 
  376 
  377 /* Attach the chain of data into the sendable packet. */
  378 #define SCTP_ATTACH_CHAIN(pak, m, packet_length) do { \
  379                                                  pak = m; \
  380                                                  pak->m_pkthdr.len = packet_length; \
  381                          } while(0)
  382 
  383 /* Other m_pkthdr type things */
  384 #define SCTP_IS_IT_BROADCAST(dst, m) ((m->m_flags & M_PKTHDR) ? in_broadcast(dst, m->m_pkthdr.rcvif) : 0)
  385 #define SCTP_IS_IT_LOOPBACK(m) ((m->m_flags & M_PKTHDR) && ((m->m_pkthdr.rcvif == NULL) || (m->m_pkthdr.rcvif->if_type == IFT_LOOP)))
  386 
  387 
  388 /* This converts any input packet header
  389  * into the chain of data holders, for BSD
  390  * its a NOP.
  391  */
  392 
  393 /* Macro's for getting length from V6/V4 header */
  394 #define SCTP_GET_IPV4_LENGTH(iph) (iph->ip_len)
  395 #define SCTP_GET_IPV6_LENGTH(ip6) (ntohs(ip6->ip6_plen))
  396 
  397 /* get the v6 hop limit */
  398 #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)));
  399 
  400 /* is the endpoint v6only? */
  401 #define SCTP_IPV6_V6ONLY(inp)   (((struct inpcb *)inp)->inp_flags & IN6P_IPV6_V6ONLY)
  402 /* is the socket non-blocking? */
  403 #define SCTP_SO_IS_NBIO(so)     ((so)->so_state & SS_NBIO)
  404 #define SCTP_SET_SO_NBIO(so)    ((so)->so_state |= SS_NBIO)
  405 #define SCTP_CLEAR_SO_NBIO(so)  ((so)->so_state &= ~SS_NBIO)
  406 /* get the socket type */
  407 #define SCTP_SO_TYPE(so)        ((so)->so_type)
  408 /* reserve sb space for a socket */
  409 #define SCTP_SORESERVE(so, send, recv)  soreserve(so, send, recv)
  410 /* wakeup a socket */
  411 #define SCTP_SOWAKEUP(so)       wakeup(&(so)->so_timeo)
  412 /* clear the socket buffer state */
  413 #define SCTP_SB_CLEAR(sb)       \
  414         (sb).sb_cc = 0;         \
  415         (sb).sb_mb = NULL;      \
  416         (sb).sb_mbcnt = 0;
  417 
  418 #define SCTP_SB_LIMIT_RCV(so) so->so_rcv.sb_hiwat
  419 #define SCTP_SB_LIMIT_SND(so) so->so_snd.sb_hiwat
  420 
  421 /*
  422  * routes, output, etc.
  423  */
  424 typedef struct route sctp_route_t;
  425 typedef struct rtentry sctp_rtentry_t;
  426 
  427 #define SCTP_RTALLOC(ro, vrf_id) rtalloc_ign((struct route *)ro, 0UL)
  428 
  429 /* Future zero copy wakeup/send  function */
  430 #define SCTP_ZERO_COPY_EVENT(inp, so)
  431 /* This is re-pulse ourselves for sendbuf */
  432 #define SCTP_ZERO_COPY_SENDQ_EVENT(inp, so)
  433 
  434 /*
  435  * IP output routines
  436  */
  437 #define SCTP_IP_OUTPUT(result, o_pak, ro, stcb, vrf_id) \
  438 { \
  439         int o_flgs = IP_RAWOUTPUT; \
  440         struct sctp_tcb *local_stcb = stcb; \
  441         if (local_stcb && \
  442             local_stcb->sctp_ep && \
  443             local_stcb->sctp_ep->sctp_socket) \
  444                 o_flgs |= local_stcb->sctp_ep->sctp_socket->so_options & SO_DONTROUTE; \
  445         result = ip_output(o_pak, NULL, ro, o_flgs, 0, NULL); \
  446 }
  447 
  448 #define SCTP_IP6_OUTPUT(result, o_pak, ro, ifp, stcb, vrf_id) \
  449 { \
  450         struct sctp_tcb *local_stcb = stcb; \
  451         if (local_stcb && local_stcb->sctp_ep) \
  452                 result = ip6_output(o_pak, \
  453                                     ((struct in6pcb *)(local_stcb->sctp_ep))->in6p_outputopts, \
  454                                     (ro), 0, 0, ifp, NULL); \
  455         else \
  456                 result = ip6_output(o_pak, NULL, (ro), 0, 0, ifp, NULL); \
  457 }
  458 
  459 struct mbuf *
  460 sctp_get_mbuf_for_msg(unsigned int space_needed,
  461     int want_header, int how, int allonebuf, int type);
  462 
  463 
  464 /*
  465  * SCTP AUTH
  466  */
  467 #define HAVE_SHA2
  468 
  469 #define SCTP_READ_RANDOM(buf, len)      read_random(buf, len)
  470 
  471 #ifdef USE_SCTP_SHA1
  472 #include <netinet/sctp_sha1.h>
  473 #else
  474 #include <crypto/sha1.h>
  475 /* map standard crypto API names */
  476 #define SHA1_Init       SHA1Init
  477 #define SHA1_Update     SHA1Update
  478 #define SHA1_Final(x,y) SHA1Final((caddr_t)x, y)
  479 #endif
  480 
  481 #if defined(HAVE_SHA2)
  482 #include <crypto/sha2/sha2.h>
  483 #endif
  484 
  485 #endif
  486 
  487 #define SCTP_DECREMENT_AND_CHECK_REFCOUNT(addr) (atomic_fetchadd_int(addr, -1) == 1)
  488 #if defined(INVARIANTS)
  489 #define SCTP_SAVE_ATOMIC_DECREMENT(addr, val) \
  490 { \
  491         int32_t oldval; \
  492         oldval = atomic_fetchadd_int(addr, -val); \
  493         if (oldval < val) { \
  494                 panic("Counter goes negative"); \
  495         } \
  496 }
  497 #else
  498 #define SCTP_SAVE_ATOMIC_DECREMENT(addr, val) \
  499 { \
  500         int32_t oldval; \
  501         oldval = atomic_fetchadd_int(addr, -val); \
  502         if (oldval < val) { \
  503                 *addr = 0; \
  504         } \
  505 }
  506 #endif

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