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 protosw sctp_seqpacket_protosw, sctp_stream_protosw;
   46 
   47 #define sctp_feature_on(inp, feature)  (inp->sctp_features |= feature)
   48 #define sctp_feature_off(inp, feature) (inp->sctp_features &= ~feature)
   49 #define sctp_is_feature_on(inp, feature) ((inp->sctp_features & feature) == feature)
   50 #define sctp_is_feature_off(inp, feature) ((inp->sctp_features & feature) == 0)
   51 
   52 #define sctp_stcb_feature_on(inp, stcb, feature) {\
   53         if (stcb) { \
   54                 stcb->asoc.sctp_features |= feature; \
   55         } else if (inp) { \
   56                 inp->sctp_features |= feature; \
   57         } \
   58 }
   59 #define sctp_stcb_feature_off(inp, stcb, feature) {\
   60         if (stcb) { \
   61                 stcb->asoc.sctp_features &= ~feature; \
   62         } else if (inp) { \
   63                 inp->sctp_features &= ~feature; \
   64         } \
   65 }
   66 #define sctp_stcb_is_feature_on(inp, stcb, feature) \
   67         (((stcb != NULL) && \
   68           ((stcb->asoc.sctp_features & feature) == feature)) || \
   69          ((stcb == NULL) && (inp != NULL) && \
   70           ((inp->sctp_features & feature) == feature)))
   71 #define sctp_stcb_is_feature_off(inp, stcb, feature) \
   72         (((stcb != NULL) && \
   73           ((stcb->asoc.sctp_features & feature) == 0)) || \
   74          ((stcb == NULL) && (inp != NULL) && \
   75           ((inp->sctp_features & feature) == 0)) || \
   76          ((stcb == NULL) && (inp == NULL)))
   77 
   78 /* managing mobility_feature in inpcb (by micchie) */
   79 #define sctp_mobility_feature_on(inp, feature)  (inp->sctp_mobility_features |= feature)
   80 #define sctp_mobility_feature_off(inp, feature) (inp->sctp_mobility_features &= ~feature)
   81 #define sctp_is_mobility_feature_on(inp, feature) (inp->sctp_mobility_features & feature)
   82 #define sctp_is_mobility_feature_off(inp, feature) ((inp->sctp_mobility_features & feature) == 0)
   83 
   84 #define sctp_maxspace(sb) (max((sb)->sb_hiwat,SCTP_MINIMAL_RWND))
   85 
   86 #define sctp_sbspace(asoc, sb) ((long) ((sctp_maxspace(sb) > (asoc)->sb_cc) ? (sctp_maxspace(sb) - (asoc)->sb_cc) : 0))
   87 
   88 #define sctp_sbspace_failedmsgs(sb) ((long) ((sctp_maxspace(sb) > SCTP_SBAVAIL(sb)) ? (sctp_maxspace(sb) - SCTP_SBAVAIL(sb)) : 0))
   89 
   90 #define sctp_sbspace_sub(a,b) (((a) > (b)) ? ((a) - (b)) : 0)
   91 
   92 /*
   93  * I tried to cache the readq entries at one point. But the reality
   94  * is that it did not add any performance since this meant we had to
   95  * lock the STCB on read. And at that point once you have to do an
   96  * extra lock, it really does not matter if the lock is in the ZONE
   97  * stuff or in our code. Note that this same problem would occur with
   98  * an mbuf cache as well so it is not really worth doing, at least
   99  * right now :-D
  100  */
  101 #ifdef INVARIANTS
  102 #define sctp_free_a_readq(_stcb, _readq) { \
  103         if ((_readq)->on_strm_q) \
  104                 panic("On strm q stcb:%p readq:%p", (_stcb), (_readq)); \
  105         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_readq), (_readq)); \
  106         SCTP_DECR_READQ_COUNT(); \
  107 }
  108 #else
  109 #define sctp_free_a_readq(_stcb, _readq) { \
  110         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_readq), (_readq)); \
  111         SCTP_DECR_READQ_COUNT(); \
  112 }
  113 #endif
  114 
  115 #define sctp_alloc_a_readq(_stcb, _readq) { \
  116         (_readq) = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_readq), struct sctp_queued_to_read); \
  117         if ((_readq)) { \
  118              SCTP_INCR_READQ_COUNT(); \
  119         } \
  120 }
  121 
  122 #define sctp_free_a_strmoq(_stcb, _strmoq, _so_locked) { \
  123         if ((_strmoq)->holds_key_ref) { \
  124                 sctp_auth_key_release(stcb, sp->auth_keyid, _so_locked); \
  125                 (_strmoq)->holds_key_ref = 0; \
  126         } \
  127         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_strmoq), (_strmoq)); \
  128         SCTP_DECR_STRMOQ_COUNT(); \
  129 }
  130 
  131 #define sctp_alloc_a_strmoq(_stcb, _strmoq) { \
  132         (_strmoq) = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_strmoq), struct sctp_stream_queue_pending); \
  133         if ((_strmoq)) { \
  134                 memset(_strmoq, 0, sizeof(struct sctp_stream_queue_pending)); \
  135                 SCTP_INCR_STRMOQ_COUNT(); \
  136                 (_strmoq)->holds_key_ref = 0; \
  137         } \
  138 }
  139 
  140 #define sctp_free_a_chunk(_stcb, _chk, _so_locked) { \
  141         if ((_chk)->holds_key_ref) {\
  142                 sctp_auth_key_release((_stcb), (_chk)->auth_keyid, _so_locked); \
  143                 (_chk)->holds_key_ref = 0; \
  144         } \
  145         if (_stcb) { \
  146                 SCTP_TCB_LOCK_ASSERT((_stcb)); \
  147                 if ((_chk)->whoTo) { \
  148                         sctp_free_remote_addr((_chk)->whoTo); \
  149                         (_chk)->whoTo = NULL; \
  150                 } \
  151                 if (((_stcb)->asoc.free_chunk_cnt > SCTP_BASE_SYSCTL(sctp_asoc_free_resc_limit)) || \
  152                     (SCTP_BASE_INFO(ipi_free_chunks) > SCTP_BASE_SYSCTL(sctp_system_free_resc_limit))) { \
  153                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), (_chk)); \
  154                         SCTP_DECR_CHK_COUNT(); \
  155                 } else { \
  156                         TAILQ_INSERT_TAIL(&(_stcb)->asoc.free_chunks, (_chk), sctp_next); \
  157                         (_stcb)->asoc.free_chunk_cnt++; \
  158                         atomic_add_int(&SCTP_BASE_INFO(ipi_free_chunks), 1); \
  159                 } \
  160         } else { \
  161                 SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_chunk), (_chk)); \
  162                 SCTP_DECR_CHK_COUNT(); \
  163         } \
  164 }
  165 
  166 #define sctp_alloc_a_chunk(_stcb, _chk) { \
  167         if (TAILQ_EMPTY(&(_stcb)->asoc.free_chunks)) { \
  168                 (_chk) = SCTP_ZONE_GET(SCTP_BASE_INFO(ipi_zone_chunk), struct sctp_tmit_chunk); \
  169                 if ((_chk)) { \
  170                         SCTP_INCR_CHK_COUNT(); \
  171                         (_chk)->whoTo = NULL; \
  172                         (_chk)->holds_key_ref = 0; \
  173                 } \
  174         } else { \
  175                 (_chk) = TAILQ_FIRST(&(_stcb)->asoc.free_chunks); \
  176                 TAILQ_REMOVE(&(_stcb)->asoc.free_chunks, (_chk), sctp_next); \
  177                 atomic_subtract_int(&SCTP_BASE_INFO(ipi_free_chunks), 1); \
  178                 (_chk)->holds_key_ref = 0; \
  179                 SCTP_STAT_INCR(sctps_cached_chk); \
  180                 (_stcb)->asoc.free_chunk_cnt--; \
  181         } \
  182 }
  183 
  184 #define sctp_free_remote_addr(__net) { \
  185         if ((__net)) {  \
  186                 if (SCTP_DECREMENT_AND_CHECK_REFCOUNT(&(__net)->ref_count)) { \
  187                         RO_NHFREE(&(__net)->ro); \
  188                         if ((__net)->src_addr_selected) { \
  189                                 sctp_free_ifa((__net)->ro._s_addr); \
  190                                 (__net)->ro._s_addr = NULL; \
  191                         } \
  192                         (__net)->src_addr_selected = 0; \
  193                         (__net)->dest_state &= ~SCTP_ADDR_REACHABLE; \
  194                         SCTP_ZONE_FREE(SCTP_BASE_INFO(ipi_zone_net), (__net)); \
  195                         SCTP_DECR_RADDR_COUNT(); \
  196                 } \
  197         } \
  198 }
  199 
  200 #define sctp_sbfree(ctl, stcb, sb, m) { \
  201         SCTP_SAVE_ATOMIC_DECREMENT(&(sb)->sb_cc, SCTP_BUF_LEN((m))); \
  202         SCTP_SAVE_ATOMIC_DECREMENT(&(sb)->sb_mbcnt, MSIZE); \
  203         if (((ctl)->do_not_ref_stcb == 0) && stcb) {\
  204                 SCTP_SAVE_ATOMIC_DECREMENT(&(stcb)->asoc.sb_cc, SCTP_BUF_LEN((m))); \
  205                 SCTP_SAVE_ATOMIC_DECREMENT(&(stcb)->asoc.my_rwnd_control_len, MSIZE); \
  206         } \
  207         if (SCTP_BUF_TYPE(m) != MT_DATA && SCTP_BUF_TYPE(m) != MT_HEADER && \
  208             SCTP_BUF_TYPE(m) != MT_OOBDATA) \
  209                 atomic_subtract_int(&(sb)->sb_ctl,SCTP_BUF_LEN((m))); \
  210 }
  211 
  212 #define sctp_sballoc(stcb, sb, m) { \
  213         atomic_add_int(&(sb)->sb_cc,SCTP_BUF_LEN((m))); \
  214         atomic_add_int(&(sb)->sb_mbcnt, MSIZE); \
  215         if (stcb) { \
  216                 atomic_add_int(&(stcb)->asoc.sb_cc, SCTP_BUF_LEN((m))); \
  217                 atomic_add_int(&(stcb)->asoc.my_rwnd_control_len, MSIZE); \
  218         } \
  219         if (SCTP_BUF_TYPE(m) != MT_DATA && SCTP_BUF_TYPE(m) != MT_HEADER && \
  220             SCTP_BUF_TYPE(m) != MT_OOBDATA) \
  221                 atomic_add_int(&(sb)->sb_ctl,SCTP_BUF_LEN((m))); \
  222 }
  223 
  224 #define sctp_ucount_incr(val) { \
  225         val++; \
  226 }
  227 
  228 #define sctp_ucount_decr(val) { \
  229         if (val > 0) { \
  230                 val--; \
  231         } else { \
  232                 val = 0; \
  233         } \
  234 }
  235 
  236 #define sctp_mbuf_crush(data) do { \
  237         struct mbuf *_m; \
  238         _m = (data); \
  239         while (_m && (SCTP_BUF_LEN(_m) == 0)) { \
  240                 (data)  = SCTP_BUF_NEXT(_m); \
  241                 SCTP_BUF_NEXT(_m) = NULL; \
  242                 sctp_m_free(_m); \
  243                 _m = (data); \
  244         } \
  245 } while (0)
  246 
  247 #define sctp_flight_size_decrease(tp1) do { \
  248         if (tp1->whoTo->flight_size >= tp1->book_size) \
  249                 tp1->whoTo->flight_size -= tp1->book_size; \
  250         else \
  251                 tp1->whoTo->flight_size = 0; \
  252 } while (0)
  253 
  254 #define sctp_flight_size_increase(tp1) do { \
  255         (tp1)->whoTo->flight_size += (tp1)->book_size; \
  256 } while (0)
  257 
  258 #ifdef SCTP_FS_SPEC_LOG
  259 #define sctp_total_flight_decrease(stcb, tp1) do { \
  260         if (stcb->asoc.fs_index > SCTP_FS_SPEC_LOG_SIZE) \
  261                 stcb->asoc.fs_index = 0;\
  262         stcb->asoc.fslog[stcb->asoc.fs_index].total_flight = stcb->asoc.total_flight; \
  263         stcb->asoc.fslog[stcb->asoc.fs_index].tsn = tp1->rec.data.tsn; \
  264         stcb->asoc.fslog[stcb->asoc.fs_index].book = tp1->book_size; \
  265         stcb->asoc.fslog[stcb->asoc.fs_index].sent = tp1->sent; \
  266         stcb->asoc.fslog[stcb->asoc.fs_index].incr = 0; \
  267         stcb->asoc.fslog[stcb->asoc.fs_index].decr = 1; \
  268         stcb->asoc.fs_index++; \
  269         tp1->window_probe = 0; \
  270         if (stcb->asoc.total_flight >= tp1->book_size) { \
  271                 stcb->asoc.total_flight -= tp1->book_size; \
  272                 if (stcb->asoc.total_flight_count > 0) \
  273                         stcb->asoc.total_flight_count--; \
  274         } else { \
  275                 stcb->asoc.total_flight = 0; \
  276                 stcb->asoc.total_flight_count = 0; \
  277         } \
  278 } while (0)
  279 
  280 #define sctp_total_flight_increase(stcb, tp1) do { \
  281         if (stcb->asoc.fs_index > SCTP_FS_SPEC_LOG_SIZE) \
  282                 stcb->asoc.fs_index = 0;\
  283         stcb->asoc.fslog[stcb->asoc.fs_index].total_flight = stcb->asoc.total_flight; \
  284         stcb->asoc.fslog[stcb->asoc.fs_index].tsn = tp1->rec.data.tsn; \
  285         stcb->asoc.fslog[stcb->asoc.fs_index].book = tp1->book_size; \
  286         stcb->asoc.fslog[stcb->asoc.fs_index].sent = tp1->sent; \
  287         stcb->asoc.fslog[stcb->asoc.fs_index].incr = 1; \
  288         stcb->asoc.fslog[stcb->asoc.fs_index].decr = 0; \
  289         stcb->asoc.fs_index++; \
  290         (stcb)->asoc.total_flight_count++; \
  291         (stcb)->asoc.total_flight += (tp1)->book_size; \
  292 } while (0)
  293 
  294 #else
  295 
  296 #define sctp_total_flight_decrease(stcb, tp1) do { \
  297         tp1->window_probe = 0; \
  298         if (stcb->asoc.total_flight >= tp1->book_size) { \
  299                 stcb->asoc.total_flight -= tp1->book_size; \
  300                 if (stcb->asoc.total_flight_count > 0) \
  301                         stcb->asoc.total_flight_count--; \
  302         } else { \
  303                 stcb->asoc.total_flight = 0; \
  304                 stcb->asoc.total_flight_count = 0; \
  305         } \
  306 } while (0)
  307 
  308 #define sctp_total_flight_increase(stcb, tp1) do { \
  309         (stcb)->asoc.total_flight_count++; \
  310         (stcb)->asoc.total_flight += (tp1)->book_size; \
  311 } while (0)
  312 
  313 #endif
  314 
  315 #define SCTP_PF_ENABLED(_net) (_net->pf_threshold < _net->failure_threshold)
  316 #define SCTP_NET_IS_PF(_net) (_net->pf_threshold < _net->error_count)
  317 
  318 struct sctp_nets;
  319 struct sctp_inpcb;
  320 struct sctp_tcb;
  321 struct sctphdr;
  322 
  323 void sctp_close(struct socket *so);
  324 int sctp_disconnect(struct socket *so);
  325 ipproto_ctlinput_t sctp_ctlinput;
  326 int sctp_ctloutput(struct socket *, struct sockopt *);
  327 #ifdef INET
  328 void sctp_input_with_port(struct mbuf *, int, uint16_t);
  329 int sctp_input(struct mbuf **, int *, int);
  330 #endif
  331 void sctp_pathmtu_adjustment(struct sctp_tcb *, uint32_t, bool);
  332 void
  333 sctp_notify(struct sctp_inpcb *, struct sctp_tcb *, struct sctp_nets *,
  334     uint8_t, uint8_t, uint16_t, uint32_t);
  335 int sctp_flush(struct socket *, int);
  336 int sctp_shutdown(struct socket *);
  337 int
  338 sctp_bindx(struct socket *, int, struct sockaddr_storage *,
  339     int, int, struct proc *);
  340 
  341 /* can't use sctp_assoc_t here */
  342 int sctp_peeloff(struct socket *, struct socket *, int, caddr_t, int *);
  343 int sctp_ingetaddr(struct socket *, struct sockaddr **);
  344 int sctp_peeraddr(struct socket *, struct sockaddr **);
  345 int sctp_listen(struct socket *, int, struct thread *);
  346 int sctp_accept(struct socket *, struct sockaddr **);
  347 
  348 #endif                          /* _KERNEL */
  349 
  350 #endif                          /* !_NETINET_SCTP_VAR_H_ */

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