The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/netinet/sctp_var.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001-2008, by Cisco Systems, Inc. All rights reserved.
    5  * Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
    6  * Copyright (c) 2008-2012, by Michael Tuexen. All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions are met:
   10  *
   11  * a) Redistributions of source code must retain the above copyright notice,
   12  *    this list of conditions and the following disclaimer.
   13  *
   14  * b) Redistributions in binary form must reproduce the above copyright
   15  *    notice, this list of conditions and the following disclaimer in
   16  *    the documentation and/or other materials provided with the distribution.
   17  *
   18  * c) Neither the name of Cisco Systems, Inc. nor the names of its
   19  *    contributors may be used to endorse or promote products derived
   20  *    from this software without specific prior written permission.
   21  *
   22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   23  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   24  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
   26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
   32  * THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #ifndef _NETINET_SCTP_VAR_H_
   39 #define _NETINET_SCTP_VAR_H_
   40 
   41 #include <netinet/sctp_uio.h>
   42 
   43 #if defined(_KERNEL) || defined(__Userspace__)
   44 
   45 extern struct pr_usrreqs sctp_usrreqs;
   46 
   47 
   48 #define sctp_feature_on(inp, feature)  (inp->sctp_features |= feature)
   49 #define sctp_feature_off(inp, feature) (inp->sctp_features &= ~feature)
   50 #define sctp_is_feature_on(inp, feature) ((inp->sctp_features & feature) == feature)
   51 #define sctp_is_feature_off(inp, feature) ((inp->sctp_features & feature) == 0)
   52 
   53 #define sctp_stcb_feature_on(inp, stcb, feature) {\
   54         if (stcb) { \
   55                 stcb->asoc.sctp_features |= feature; \
   56         } else if (inp) { \
   57                 inp->sctp_features |= feature; \
   58         } \
   59 }
   60 #define sctp_stcb_feature_off(inp, stcb, feature) {\
   61         if (stcb) { \
   62                 stcb->asoc.sctp_features &= ~feature; \
   63         } else if (inp) { \
   64                 inp->sctp_features &= ~feature; \
   65         } \
   66 }
   67 #define sctp_stcb_is_feature_on(inp, stcb, feature) \
   68         (((stcb != NULL) && \
   69           ((stcb->asoc.sctp_features & feature) == feature)) || \
   70          ((stcb == NULL) && (inp != NULL) && \
   71           ((inp->sctp_features & feature) == feature)))
   72 #define sctp_stcb_is_feature_off(inp, stcb, feature) \
   73         (((stcb != NULL) && \
   74           ((stcb->asoc.sctp_features & feature) == 0)) || \
   75          ((stcb == NULL) && (inp != NULL) && \
   76           ((inp->sctp_features & feature) == 0)) || \
   77          ((stcb == NULL) && (inp == NULL)))
   78 
   79 /* managing mobility_feature in inpcb (by micchie) */
   80 #define sctp_mobility_feature_on(inp, feature)  (inp->sctp_mobility_features |= feature)
   81 #define sctp_mobility_feature_off(inp, feature) (inp->sctp_mobility_features &= ~feature)
   82 #define sctp_is_mobility_feature_on(inp, feature) (inp->sctp_mobility_features & feature)
   83 #define sctp_is_mobility_feature_off(inp, feature) ((inp->sctp_mobility_features & feature) == 0)
   84 
   85 #define sctp_maxspace(sb) (max((sb)->sb_hiwat,SCTP_MINIMAL_RWND))
   86 
   87 #define sctp_sbspace(asoc, sb) ((long) ((sctp_maxspace(sb) > (asoc)->sb_cc) ? (sctp_maxspace(sb) - (asoc)->sb_cc) : 0))
   88 
   89 #define sctp_sbspace_failedmsgs(sb) ((long) ((sctp_maxspace(sb) > (sb)->sb_cc) ? (sctp_maxspace(sb) - (sb)->sb_cc) : 0))
   90 
   91 #define sctp_sbspace_sub(a,b) (((a) > (b)) ? ((a) - (b)) : 0)
   92 
   93 /*
   94  * I tried to cache the readq entries at one point. But the reality
   95  * is that it did not add any performance since this meant we had to
   96  * lock the STCB on read. And at that point once you have to do an
   97  * extra lock, it really does not matter if the lock is in the ZONE
   98  * stuff or in our code. Note that this same problem would occur with
   99  * an mbuf cache as well so it is not really worth doing, at least
  100  * right now :-D
  101  */
  102 #ifdef INVARIANTS
  103 #define sctp_free_a_readq(_stcb, _readq) { \
  104         if ((_readq)->on_strm_q) \
  105                 panic("On strm q stcb:%p readq:%p", (_stcb), (_readq)); \
  106         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_readq), (_readq)); \
  107         SCTP_DECR_READQ_COUNT(); \
  108 }
  109 #else
  110 #define sctp_free_a_readq(_stcb, _readq) { \
  111         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_readq), (_readq)); \
  112         SCTP_DECR_READQ_COUNT(); \
  113 }
  114 #endif
  115 
  116 #define sctp_alloc_a_readq(_stcb, _readq) { \
  117         (_readq) = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_readq), struct sctp_queued_to_read); \
  118         if ((_readq)) { \
  119              SCTP_INCR_READQ_COUNT(); \
  120         } \
  121 }
  122 
  123 #define sctp_free_a_strmoq(_stcb, _strmoq, _so_locked) { \
  124         if ((_strmoq)->holds_key_ref) { \
  125                 sctp_auth_key_release(stcb, sp->auth_keyid, _so_locked); \
  126                 (_strmoq)->holds_key_ref = 0; \
  127         } \
  128         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_strmoq), (_strmoq)); \
  129         SCTP_DECR_STRMOQ_COUNT(); \
  130 }
  131 
  132 #define sctp_alloc_a_strmoq(_stcb, _strmoq) { \
  133         (_strmoq) = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_strmoq), struct sctp_stream_queue_pending); \
  134         if ((_strmoq)) { \
  135                 memset(_strmoq, 0, sizeof(struct sctp_stream_queue_pending)); \
  136                 SCTP_INCR_STRMOQ_COUNT(); \
  137                 (_strmoq)->holds_key_ref = 0; \
  138         } \
  139 }
  140 
  141 #define sctp_free_a_chunk(_stcb, _chk, _so_locked) { \
  142         if ((_chk)->holds_key_ref) {\
  143                 sctp_auth_key_release((_stcb), (_chk)->auth_keyid, _so_locked); \
  144                 (_chk)->holds_key_ref = 0; \
  145         } \
  146         if (_stcb) { \
  147                 SCTP_TCB_LOCK_ASSERT((_stcb)); \
  148                 if ((_chk)->whoTo) { \
  149                         sctp_free_remote_addr((_chk)->whoTo); \
  150                         (_chk)->whoTo = NULL; \
  151                 } \
  152                 if (((_stcb)->asoc.free_chunk_cnt > SCTP_BASE_SYSCTL(sctp_asoc_free_resc_limit)) || \
  153                     (SCTP_BASE_INFO(ipi_free_chunks) > SCTP_BASE_SYSCTL(sctp_system_free_resc_limit))) { \
  154                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), (_chk)); \
  155                         SCTP_DECR_CHK_COUNT(); \
  156                 } else { \
  157                         TAILQ_INSERT_TAIL(&(_stcb)->asoc.free_chunks, (_chk), sctp_next); \
  158                         (_stcb)->asoc.free_chunk_cnt++; \
  159                         atomic_add_int(&SCTP_BASE_INFO(ipi_free_chunks), 1); \
  160                 } \
  161         } else { \
  162                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), (_chk)); \
  163                 SCTP_DECR_CHK_COUNT(); \
  164         } \
  165 }
  166 
  167 #define sctp_alloc_a_chunk(_stcb, _chk) { \
  168         if (TAILQ_EMPTY(&(_stcb)->asoc.free_chunks)) { \
  169                 (_chk) = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_chunk), struct sctp_tmit_chunk); \
  170                 if ((_chk)) { \
  171                         SCTP_INCR_CHK_COUNT(); \
  172                         (_chk)->whoTo = NULL; \
  173                         (_chk)->holds_key_ref = 0; \
  174                 } \
  175         } else { \
  176                 (_chk) = TAILQ_FIRST(&(_stcb)->asoc.free_chunks); \
  177                 TAILQ_REMOVE(&(_stcb)->asoc.free_chunks, (_chk), sctp_next); \
  178                 atomic_subtract_int(&SCTP_BASE_INFO(ipi_free_chunks), 1); \
  179                 (_chk)->holds_key_ref = 0; \
  180                 SCTP_STAT_INCR(sctps_cached_chk); \
  181                 (_stcb)->asoc.free_chunk_cnt--; \
  182         } \
  183 }
  184 
  185 
  186 #define sctp_free_remote_addr(__net) { \
  187         if ((__net)) {  \
  188                 if (SCTP_DECREMENT_AND_CHECK_REFCOUNT(&(__net)->ref_count)) { \
  189                         if ((__net)->ro.ro_rt) { \
  190                                 RTFREE((__net)->ro.ro_rt); \
  191                                 (__net)->ro.ro_rt = NULL; \
  192                         } \
  193                         if ((__net)->src_addr_selected) { \
  194                                 sctp_free_ifa((__net)->ro._s_addr); \
  195                                 (__net)->ro._s_addr = NULL; \
  196                         } \
  197                         (__net)->src_addr_selected = 0; \
  198                         (__net)->dest_state &= ~SCTP_ADDR_REACHABLE; \
  199                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_net), (__net)); \
  200                         SCTP_DECR_RADDR_COUNT(); \
  201                 } \
  202         } \
  203 }
  204 
  205 #define sctp_sbfree(ctl, stcb, sb, m) { \
  206         SCTP_SAVE_ATOMIC_DECREMENT(&(sb)->sb_cc, SCTP_BUF_LEN((m))); \
  207         SCTP_SAVE_ATOMIC_DECREMENT(&(sb)->sb_mbcnt, MSIZE); \
  208         if (((ctl)->do_not_ref_stcb == 0) && stcb) {\
  209                 SCTP_SAVE_ATOMIC_DECREMENT(&(stcb)->asoc.sb_cc, SCTP_BUF_LEN((m))); \
  210                 SCTP_SAVE_ATOMIC_DECREMENT(&(stcb)->asoc.my_rwnd_control_len, MSIZE); \
  211         } \
  212         if (SCTP_BUF_TYPE(m) != MT_DATA && SCTP_BUF_TYPE(m) != MT_HEADER && \
  213             SCTP_BUF_TYPE(m) != MT_OOBDATA) \
  214                 atomic_subtract_int(&(sb)->sb_ctl,SCTP_BUF_LEN((m))); \
  215 }
  216 
  217 #define sctp_sballoc(stcb, sb, m) { \
  218         atomic_add_int(&(sb)->sb_cc,SCTP_BUF_LEN((m))); \
  219         atomic_add_int(&(sb)->sb_mbcnt, MSIZE); \
  220         if (stcb) { \
  221                 atomic_add_int(&(stcb)->asoc.sb_cc, SCTP_BUF_LEN((m))); \
  222                 atomic_add_int(&(stcb)->asoc.my_rwnd_control_len, MSIZE); \
  223         } \
  224         if (SCTP_BUF_TYPE(m) != MT_DATA && SCTP_BUF_TYPE(m) != MT_HEADER && \
  225             SCTP_BUF_TYPE(m) != MT_OOBDATA) \
  226                 atomic_add_int(&(sb)->sb_ctl,SCTP_BUF_LEN((m))); \
  227 }
  228 
  229 
  230 #define sctp_ucount_incr(val) { \
  231         val++; \
  232 }
  233 
  234 #define sctp_ucount_decr(val) { \
  235         if (val > 0) { \
  236                 val--; \
  237         } else { \
  238                 val = 0; \
  239         } \
  240 }
  241 
  242 #define sctp_mbuf_crush(data) do { \
  243         struct mbuf *_m; \
  244         _m = (data); \
  245         while (_m && (SCTP_BUF_LEN(_m) == 0)) { \
  246                 (data)  = SCTP_BUF_NEXT(_m); \
  247                 SCTP_BUF_NEXT(_m) = NULL; \
  248                 sctp_m_free(_m); \
  249                 _m = (data); \
  250         } \
  251 } while (0)
  252 
  253 #define sctp_flight_size_decrease(tp1) do { \
  254         if (tp1->whoTo->flight_size >= tp1->book_size) \
  255                 tp1->whoTo->flight_size -= tp1->book_size; \
  256         else \
  257                 tp1->whoTo->flight_size = 0; \
  258 } while (0)
  259 
  260 #define sctp_flight_size_increase(tp1) do { \
  261         (tp1)->whoTo->flight_size += (tp1)->book_size; \
  262 } while (0)
  263 
  264 #ifdef SCTP_FS_SPEC_LOG
  265 #define sctp_total_flight_decrease(stcb, tp1) do { \
  266         if (stcb->asoc.fs_index > SCTP_FS_SPEC_LOG_SIZE) \
  267                 stcb->asoc.fs_index = 0;\
  268         stcb->asoc.fslog[stcb->asoc.fs_index].total_flight = stcb->asoc.total_flight; \
  269         stcb->asoc.fslog[stcb->asoc.fs_index].tsn = tp1->rec.data.tsn; \
  270         stcb->asoc.fslog[stcb->asoc.fs_index].book = tp1->book_size; \
  271         stcb->asoc.fslog[stcb->asoc.fs_index].sent = tp1->sent; \
  272         stcb->asoc.fslog[stcb->asoc.fs_index].incr = 0; \
  273         stcb->asoc.fslog[stcb->asoc.fs_index].decr = 1; \
  274         stcb->asoc.fs_index++; \
  275         tp1->window_probe = 0; \
  276         if (stcb->asoc.total_flight >= tp1->book_size) { \
  277                 stcb->asoc.total_flight -= tp1->book_size; \
  278                 if (stcb->asoc.total_flight_count > 0) \
  279                         stcb->asoc.total_flight_count--; \
  280         } else { \
  281                 stcb->asoc.total_flight = 0; \
  282                 stcb->asoc.total_flight_count = 0; \
  283         } \
  284 } while (0)
  285 
  286 #define sctp_total_flight_increase(stcb, tp1) do { \
  287         if (stcb->asoc.fs_index > SCTP_FS_SPEC_LOG_SIZE) \
  288                 stcb->asoc.fs_index = 0;\
  289         stcb->asoc.fslog[stcb->asoc.fs_index].total_flight = stcb->asoc.total_flight; \
  290         stcb->asoc.fslog[stcb->asoc.fs_index].tsn = tp1->rec.data.tsn; \
  291         stcb->asoc.fslog[stcb->asoc.fs_index].book = tp1->book_size; \
  292         stcb->asoc.fslog[stcb->asoc.fs_index].sent = tp1->sent; \
  293         stcb->asoc.fslog[stcb->asoc.fs_index].incr = 1; \
  294         stcb->asoc.fslog[stcb->asoc.fs_index].decr = 0; \
  295         stcb->asoc.fs_index++; \
  296         (stcb)->asoc.total_flight_count++; \
  297         (stcb)->asoc.total_flight += (tp1)->book_size; \
  298 } while (0)
  299 
  300 #else
  301 
  302 #define sctp_total_flight_decrease(stcb, tp1) do { \
  303         tp1->window_probe = 0; \
  304         if (stcb->asoc.total_flight >= tp1->book_size) { \
  305                 stcb->asoc.total_flight -= tp1->book_size; \
  306                 if (stcb->asoc.total_flight_count > 0) \
  307                         stcb->asoc.total_flight_count--; \
  308         } else { \
  309                 stcb->asoc.total_flight = 0; \
  310                 stcb->asoc.total_flight_count = 0; \
  311         } \
  312 } while (0)
  313 
  314 #define sctp_total_flight_increase(stcb, tp1) do { \
  315         (stcb)->asoc.total_flight_count++; \
  316         (stcb)->asoc.total_flight += (tp1)->book_size; \
  317 } while (0)
  318 
  319 #endif
  320 
  321 #define SCTP_PF_ENABLED(_net) (_net->pf_threshold < _net->failure_threshold)
  322 #define SCTP_NET_IS_PF(_net) (_net->pf_threshold < _net->error_count)
  323 
  324 struct sctp_nets;
  325 struct sctp_inpcb;
  326 struct sctp_tcb;
  327 struct sctphdr;
  328 
  329 
  330 void sctp_close(struct socket *so);
  331 int sctp_disconnect(struct socket *so);
  332 void sctp_ctlinput(int, struct sockaddr *, void *);
  333 int sctp_ctloutput(struct socket *, struct sockopt *);
  334 #ifdef INET
  335 void sctp_input_with_port(struct mbuf *, int, uint16_t);
  336 int sctp_input(struct mbuf **, int *, int);
  337 #endif
  338 void sctp_pathmtu_adjustment(struct sctp_tcb *, uint16_t);
  339 void sctp_drain(void);
  340 void sctp_init(void);
  341 void
  342 sctp_notify(struct sctp_inpcb *, struct sctp_tcb *, struct sctp_nets *,
  343     uint8_t, uint8_t, uint16_t, uint32_t);
  344 int sctp_flush(struct socket *, int);
  345 int sctp_shutdown(struct socket *);
  346 int
  347 sctp_bindx(struct socket *, int, struct sockaddr_storage *,
  348     int, int, struct proc *);
  349 
  350 /* can't use sctp_assoc_t here */
  351 int sctp_peeloff(struct socket *, struct socket *, int, caddr_t, int *);
  352 int sctp_ingetaddr(struct socket *, struct sockaddr **);
  353 int sctp_peeraddr(struct socket *, struct sockaddr **);
  354 int sctp_listen(struct socket *, int, struct thread *);
  355 int sctp_accept(struct socket *, struct sockaddr **);
  356 
  357 #endif                          /* _KERNEL */
  358 
  359 #endif                          /* !_NETINET_SCTP_VAR_H_ */

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