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/sctputil.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2001-2007, 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_UTIL_H_
   39 #define _NETINET_SCTP_UTIL_H_
   40 
   41 #if defined(_KERNEL) || defined(__Userspace__)
   42 
   43 #define SCTP_READ_LOCK_HELD 1
   44 #define SCTP_READ_LOCK_NOT_HELD 0
   45 
   46 #ifdef SCTP_ASOCLOG_OF_TSNS
   47 void sctp_print_out_track_log(struct sctp_tcb *stcb);
   48 #endif
   49 
   50 #ifdef SCTP_MBUF_LOGGING
   51 struct mbuf *sctp_m_free(struct mbuf *m);
   52 void sctp_m_freem(struct mbuf *m);
   53 #else
   54 #define sctp_m_free m_free
   55 #define sctp_m_freem m_freem
   56 #endif
   57 
   58 #if defined(SCTP_LOCAL_TRACE_BUF)
   59 void
   60      sctp_log_trace(uint32_t fr, const char *str SCTP_UNUSED, uint32_t a, uint32_t b, uint32_t c, uint32_t d, uint32_t e, uint32_t f);
   61 #endif
   62 
   63 #define sctp_get_associd(stcb) ((sctp_assoc_t)stcb->asoc.assoc_id)
   64 
   65 
   66 /*
   67  * Function prototypes
   68  */
   69 int32_t
   70         sctp_map_assoc_state(int);
   71 
   72 uint32_t
   73          sctp_get_ifa_hash_val(struct sockaddr *addr);
   74 
   75 struct sctp_ifa *sctp_find_ifa_in_ep(struct sctp_inpcb *inp, struct sockaddr *addr, int hold_lock);
   76 
   77 struct sctp_ifa *sctp_find_ifa_by_addr(struct sockaddr *addr, uint32_t vrf_id, int holds_lock);
   78 
   79 uint32_t sctp_select_initial_TSN(struct sctp_pcb *);
   80 
   81 uint32_t sctp_select_a_tag(struct sctp_inpcb *, uint16_t lport, uint16_t rport, int);
   82 
   83 int sctp_init_asoc(struct sctp_inpcb *, struct sctp_tcb *, uint32_t, uint32_t, uint16_t);
   84 
   85 void sctp_fill_random_store(struct sctp_pcb *);
   86 
   87 void
   88 sctp_notify_stream_reset_add(struct sctp_tcb *stcb, uint16_t numberin,
   89     uint16_t numberout, int flag);
   90 void
   91      sctp_notify_stream_reset_tsn(struct sctp_tcb *stcb, uint32_t sending_tsn, uint32_t recv_tsn, int flag);
   92 
   93 /*
   94  * NOTE: sctp_timer_start() will increment the reference count of any relevant
   95  * structure the timer is referencing, in order to prevent a race condition
   96  * between the timer executing and the structure being freed.
   97  *
   98  * When the timer fires or sctp_timer_stop() is called, these references are
   99  * removed.
  100  */
  101 void
  102 sctp_timer_start(int, struct sctp_inpcb *, struct sctp_tcb *,
  103     struct sctp_nets *);
  104 
  105 void
  106 sctp_timer_stop(int, struct sctp_inpcb *, struct sctp_tcb *,
  107     struct sctp_nets *, uint32_t);
  108 
  109 int
  110     sctp_dynamic_set_primary(struct sockaddr *sa, uint32_t vrf_id);
  111 
  112 void
  113      sctp_mtu_size_reset(struct sctp_inpcb *, struct sctp_association *, uint32_t);
  114 
  115 void
  116 sctp_wakeup_the_read_socket(struct sctp_inpcb *inp, struct sctp_tcb *stcb,
  117     int so_locked
  118     SCTP_UNUSED
  119 );
  120 
  121 void
  122 sctp_add_to_readq(struct sctp_inpcb *inp,
  123     struct sctp_tcb *stcb,
  124     struct sctp_queued_to_read *control,
  125     struct sockbuf *sb,
  126     int end,
  127     int inpread_locked,
  128     int so_locked);
  129 
  130 void sctp_iterator_worker(void);
  131 
  132 uint32_t sctp_get_prev_mtu(uint32_t);
  133 uint32_t sctp_get_next_mtu(uint32_t);
  134 
  135 void
  136      sctp_timeout_handler(void *);
  137 
  138 int
  139 sctp_calculate_rto(struct sctp_tcb *, struct sctp_association *,
  140     struct sctp_nets *, struct timeval *, int);
  141 
  142 uint32_t sctp_calculate_len(struct mbuf *);
  143 
  144 caddr_t sctp_m_getptr(struct mbuf *, int, int, uint8_t *);
  145 
  146 struct sctp_paramhdr *
  147 sctp_get_next_param(struct mbuf *, int,
  148     struct sctp_paramhdr *, int);
  149 
  150 struct mbuf *sctp_add_pad_tombuf(struct mbuf *, int);
  151 
  152 struct mbuf *sctp_pad_lastmbuf(struct mbuf *, int, struct mbuf *);
  153 
  154 void sctp_ulp_notify(uint32_t, struct sctp_tcb *, uint32_t, void *, int);
  155 
  156 void
  157 sctp_pull_off_control_to_new_inp(struct sctp_inpcb *old_inp,
  158     struct sctp_inpcb *new_inp,
  159     struct sctp_tcb *stcb, int waitflags);
  160 
  161 
  162 void sctp_stop_timers_for_shutdown(struct sctp_tcb *);
  163 
  164 /* Stop all timers for association and remote addresses. */
  165 void sctp_stop_association_timers(struct sctp_tcb *, bool);
  166 
  167 void sctp_report_all_outbound(struct sctp_tcb *, uint16_t, int);
  168 
  169 int sctp_expand_mapping_array(struct sctp_association *, uint32_t);
  170 
  171 void
  172 sctp_abort_notification(struct sctp_tcb *, uint8_t, uint16_t,
  173     struct sctp_abort_chunk *, int);
  174 
  175 /* We abort responding to an IP packet for some reason */
  176 void
  177 sctp_abort_association(struct sctp_inpcb *, struct sctp_tcb *, struct mbuf *,
  178     int, struct sockaddr *, struct sockaddr *,
  179     struct sctphdr *, struct mbuf *,
  180     uint8_t, uint32_t,
  181     uint32_t, uint16_t);
  182 
  183 
  184 /* We choose to abort via user input */
  185 void
  186 sctp_abort_an_association(struct sctp_inpcb *, struct sctp_tcb *,
  187     struct mbuf *, int);
  188 
  189 void
  190 sctp_handle_ootb(struct mbuf *, int, int,
  191     struct sockaddr *, struct sockaddr *,
  192     struct sctphdr *, struct sctp_inpcb *,
  193     struct mbuf *,
  194     uint8_t, uint32_t, uint16_t,
  195     uint32_t, uint16_t);
  196 
  197 int
  198 sctp_connectx_helper_add(struct sctp_tcb *stcb, struct sockaddr *addr,
  199     int totaddr, int *error);
  200 
  201 int
  202 sctp_connectx_helper_find(struct sctp_inpcb *, struct sockaddr *,
  203     unsigned int, unsigned int *, unsigned int *, unsigned int);
  204 
  205 int sctp_is_there_an_abort_here(struct mbuf *, int, uint32_t *);
  206 #ifdef INET6
  207 uint32_t sctp_is_same_scope(struct sockaddr_in6 *, struct sockaddr_in6 *);
  208 
  209 struct sockaddr_in6 *sctp_recover_scope(struct sockaddr_in6 *, struct sockaddr_in6 *);
  210 
  211 #define sctp_recover_scope_mac(addr, store) do { \
  212          if ((addr->sin6_family == AF_INET6) && \
  213              (IN6_IS_SCOPE_LINKLOCAL(&addr->sin6_addr))) { \
  214                 *store = *addr; \
  215                 if (addr->sin6_scope_id == 0) { \
  216                         if (!sa6_recoverscope(store)) { \
  217                                 addr = store; \
  218                         } \
  219                 } else { \
  220                         in6_clearscope(&addr->sin6_addr); \
  221                         addr = store; \
  222                 } \
  223          } \
  224 } while (0)
  225 #endif
  226 
  227 int sctp_cmpaddr(struct sockaddr *, struct sockaddr *);
  228 
  229 void sctp_print_address(struct sockaddr *);
  230 
  231 int
  232 sctp_release_pr_sctp_chunk(struct sctp_tcb *, struct sctp_tmit_chunk *,
  233     uint8_t, int);
  234 
  235 struct mbuf *sctp_generate_cause(uint16_t, char *);
  236 struct mbuf *sctp_generate_no_user_data_cause(uint32_t);
  237 
  238 void
  239 sctp_bindx_add_address(struct socket *so, struct sctp_inpcb *inp,
  240     struct sockaddr *sa, uint32_t vrf_id, int *error,
  241     void *p);
  242 void
  243 sctp_bindx_delete_address(struct sctp_inpcb *inp, struct sockaddr *sa,
  244     uint32_t vrf_id, int *error);
  245 
  246 int sctp_local_addr_count(struct sctp_tcb *stcb);
  247 
  248 #ifdef SCTP_MBCNT_LOGGING
  249 void
  250 sctp_free_bufspace(struct sctp_tcb *, struct sctp_association *,
  251     struct sctp_tmit_chunk *, int);
  252 
  253 #else
  254 #define sctp_free_bufspace(stcb, asoc, tp1, chk_cnt)  \
  255 do { \
  256         if (tp1->data != NULL) { \
  257                 atomic_subtract_int(&((asoc)->chunks_on_out_queue), chk_cnt); \
  258                 if ((asoc)->total_output_queue_size >= tp1->book_size) { \
  259                         atomic_subtract_int(&((asoc)->total_output_queue_size), tp1->book_size); \
  260                 } else { \
  261                         (asoc)->total_output_queue_size = 0; \
  262                 } \
  263                 if (stcb->sctp_socket && ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || \
  264                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
  265                         if (stcb->sctp_socket->so_snd.sb_cc >= tp1->book_size) { \
  266                                 atomic_subtract_int(&((stcb)->sctp_socket->so_snd.sb_cc), tp1->book_size); \
  267                         } else { \
  268                                 stcb->sctp_socket->so_snd.sb_cc = 0; \
  269                         } \
  270                 } \
  271         } \
  272 } while (0)
  273 
  274 #endif
  275 
  276 #define sctp_free_spbufspace(stcb, asoc, sp)  \
  277 do { \
  278         if (sp->data != NULL) { \
  279                 if ((asoc)->total_output_queue_size >= sp->length) { \
  280                         atomic_subtract_int(&(asoc)->total_output_queue_size, sp->length); \
  281                 } else { \
  282                         (asoc)->total_output_queue_size = 0; \
  283                 } \
  284                 if (stcb->sctp_socket && ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || \
  285                     (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
  286                         if (stcb->sctp_socket->so_snd.sb_cc >= sp->length) { \
  287                                 atomic_subtract_int(&stcb->sctp_socket->so_snd.sb_cc,sp->length); \
  288                         } else { \
  289                                 stcb->sctp_socket->so_snd.sb_cc = 0; \
  290                         } \
  291                 } \
  292         } \
  293 } while (0)
  294 
  295 #define sctp_snd_sb_alloc(stcb, sz)  \
  296 do { \
  297         atomic_add_int(&stcb->asoc.total_output_queue_size,sz); \
  298         if ((stcb->sctp_socket != NULL) && \
  299             ((stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || \
  300              (stcb->sctp_ep->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { \
  301                 atomic_add_int(&stcb->sctp_socket->so_snd.sb_cc,sz); \
  302         } \
  303 } while (0)
  304 
  305 /* functions to start/stop udp tunneling */
  306 void sctp_over_udp_stop(void);
  307 int sctp_over_udp_start(void);
  308 
  309 int
  310 sctp_soreceive(struct socket *so, struct sockaddr **psa,
  311     struct uio *uio,
  312     struct mbuf **mp0,
  313     struct mbuf **controlp,
  314     int *flagsp);
  315 
  316 void
  317      sctp_misc_ints(uint8_t from, uint32_t a, uint32_t b, uint32_t c, uint32_t d);
  318 
  319 void
  320 sctp_wakeup_log(struct sctp_tcb *stcb,
  321     uint32_t wake_cnt, int from);
  322 
  323 void sctp_log_strm_del_alt(struct sctp_tcb *stcb, uint32_t, uint16_t, uint16_t, int);
  324 
  325 void sctp_log_nagle_event(struct sctp_tcb *stcb, int action);
  326 
  327 
  328 #ifdef SCTP_MBUF_LOGGING
  329 void
  330      sctp_log_mb(struct mbuf *m, int from);
  331 
  332 void
  333      sctp_log_mbc(struct mbuf *m, int from);
  334 #endif
  335 
  336 void
  337 sctp_sblog(struct sockbuf *sb,
  338     struct sctp_tcb *stcb, int from, int incr);
  339 
  340 void
  341 sctp_log_strm_del(struct sctp_queued_to_read *control,
  342     struct sctp_queued_to_read *poschk,
  343     int from);
  344 void sctp_log_cwnd(struct sctp_tcb *stcb, struct sctp_nets *, int, uint8_t);
  345 void rto_logging(struct sctp_nets *net, int from);
  346 
  347 void sctp_log_closing(struct sctp_inpcb *inp, struct sctp_tcb *stcb, int16_t loc);
  348 
  349 void sctp_log_lock(struct sctp_inpcb *inp, struct sctp_tcb *stcb, uint8_t from);
  350 void sctp_log_maxburst(struct sctp_tcb *stcb, struct sctp_nets *, int, int, uint8_t);
  351 void sctp_log_block(uint8_t, struct sctp_association *, ssize_t);
  352 void sctp_log_rwnd(uint8_t, uint32_t, uint32_t, uint32_t);
  353 void sctp_log_rwnd_set(uint8_t, uint32_t, uint32_t, uint32_t, uint32_t);
  354 int sctp_fill_stat_log(void *, size_t *);
  355 void sctp_log_fr(uint32_t, uint32_t, uint32_t, int);
  356 void sctp_log_sack(uint32_t, uint32_t, uint32_t, uint16_t, uint16_t, int);
  357 void sctp_log_map(uint32_t, uint32_t, uint32_t, int);
  358 void sctp_print_mapping_array(struct sctp_association *asoc);
  359 void sctp_clr_stat_log(void);
  360 
  361 
  362 #ifdef SCTP_AUDITING_ENABLED
  363 void
  364 sctp_auditing(int, struct sctp_inpcb *, struct sctp_tcb *,
  365     struct sctp_nets *);
  366 void sctp_audit_log(uint8_t, uint8_t);
  367 
  368 #endif
  369 uint32_t sctp_min_mtu(uint32_t, uint32_t, uint32_t);
  370 void sctp_hc_set_mtu(union sctp_sockstore *, uint16_t, uint32_t);
  371 uint32_t sctp_hc_get_mtu(union sctp_sockstore *, uint16_t);
  372 void sctp_set_state(struct sctp_tcb *, int);
  373 void sctp_add_substate(struct sctp_tcb *, int);
  374 uint32_t sctp_ticks_to_msecs(uint32_t);
  375 uint32_t sctp_msecs_to_ticks(uint32_t);
  376 uint32_t sctp_ticks_to_secs(uint32_t);
  377 uint32_t sctp_secs_to_ticks(uint32_t);
  378 
  379 #endif                          /* _KERNEL */
  380 #endif

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