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/tcp_debug.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1993
    5  *      The Regents of the University of California.
    6  * 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
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  *      @(#)tcp_debug.c 8.1 (Berkeley) 6/10/93
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include "opt_inet.h"
   39 #include "opt_inet6.h"
   40 #include "opt_tcpdebug.h"
   41 
   42 #ifdef TCPDEBUG
   43 /* load symbolic names */
   44 #define PRUREQUESTS
   45 #define TCPSTATES
   46 #define TCPTIMERS
   47 #define TANAMES
   48 #endif
   49 
   50 #include <sys/param.h>
   51 #include <sys/systm.h>
   52 #include <sys/kernel.h>
   53 #include <sys/lock.h>
   54 #include <sys/mbuf.h>
   55 #include <sys/mutex.h>
   56 #include <sys/protosw.h>
   57 #include <sys/socket.h>
   58 
   59 #include <netinet/in.h>
   60 #include <netinet/in_systm.h>
   61 #include <netinet/ip.h>
   62 #ifdef INET6
   63 #include <netinet/ip6.h>
   64 #endif
   65 #include <netinet/ip_var.h>
   66 #include <netinet/tcp.h>
   67 #include <netinet/tcp_fsm.h>
   68 #include <netinet/tcp_timer.h>
   69 #include <netinet/tcp_var.h>
   70 #include <netinet/tcpip.h>
   71 #include <netinet/tcp_debug.h>
   72 
   73 #ifdef TCPDEBUG
   74 static int              tcpconsdebug = 0;
   75 #endif
   76 
   77 /*
   78  * Global ring buffer of TCP debugging state.  Each entry captures a snapshot
   79  * of TCP connection state at any given moment.  tcp_debx addresses at the
   80  * next available slot.  There is no explicit export of this data structure;
   81  * it will be read via /dev/kmem by debugging tools.
   82  */
   83 static struct tcp_debug tcp_debug[TCP_NDEBUG];
   84 static int              tcp_debx;
   85 
   86 /*
   87  * All global state is protected by tcp_debug_mtx; tcp_trace() is split into
   88  * two parts, one of which saves connection and other state into the global
   89  * array (locked by tcp_debug_mtx).
   90  */
   91 struct mtx              tcp_debug_mtx;
   92 MTX_SYSINIT(tcp_debug_mtx, &tcp_debug_mtx, "tcp_debug_mtx", MTX_DEF);
   93 
   94 /*
   95  * Save TCP state at a given moment; optionally, both tcpcb and TCP packet
   96  * header state will be saved.
   97  */
   98 void
   99 tcp_trace(short act, short ostate, struct tcpcb *tp, void *ipgen,
  100     struct tcphdr *th, int req)
  101 {
  102 #ifdef INET6
  103         int isipv6;
  104 #endif /* INET6 */
  105         tcp_seq seq, ack;
  106         int len, flags;
  107         struct tcp_debug *td;
  108 
  109         mtx_lock(&tcp_debug_mtx);
  110         td = &tcp_debug[tcp_debx++];
  111         if (tcp_debx == TCP_NDEBUG)
  112                 tcp_debx = 0;
  113         bzero(td, sizeof(*td));
  114 #ifdef INET6
  115         isipv6 = (ipgen != NULL && ((struct ip *)ipgen)->ip_v == 6) ? 1 : 0;
  116 #endif /* INET6 */
  117         td->td_family =
  118 #ifdef INET6
  119             (isipv6 != 0) ? AF_INET6 :
  120 #endif
  121             AF_INET;
  122 #ifdef INET
  123         td->td_time = iptime();
  124 #endif
  125         td->td_act = act;
  126         td->td_ostate = ostate;
  127         td->td_tcb = (caddr_t)tp;
  128         if (tp != NULL)
  129                 td->td_cb = *tp;
  130         if (ipgen != NULL) {
  131                 switch (td->td_family) {
  132 #ifdef INET
  133                 case AF_INET:
  134                         bcopy(ipgen, &td->td_ti.ti_i, sizeof(td->td_ti.ti_i));
  135                         break;
  136 #endif
  137 #ifdef INET6
  138                 case AF_INET6:
  139                         bcopy(ipgen, td->td_ip6buf, sizeof(td->td_ip6buf));
  140                         break;
  141 #endif
  142                 }
  143         }
  144         if (th != NULL) {
  145                 switch (td->td_family) {
  146 #ifdef INET
  147                 case AF_INET:
  148                         td->td_ti.ti_t = *th;
  149                         break;
  150 #endif
  151 #ifdef INET6
  152                 case AF_INET6:
  153                         td->td_ti6.th = *th;
  154                         break;
  155 #endif
  156                 }
  157         }
  158         td->td_req = req;
  159         mtx_unlock(&tcp_debug_mtx);
  160 #ifdef TCPDEBUG
  161         if (tcpconsdebug == 0)
  162                 return;
  163         if (tp != NULL)
  164                 printf("%p %s:", tp, tcpstates[ostate]);
  165         else
  166                 printf("???????? ");
  167         printf("%s ", tanames[act]);
  168         switch (act) {
  169         case TA_INPUT:
  170         case TA_OUTPUT:
  171         case TA_DROP:
  172                 if (ipgen == NULL || th == NULL)
  173                         break;
  174                 seq = th->th_seq;
  175                 ack = th->th_ack;
  176                 len =
  177 #ifdef INET6
  178                     isipv6 ? ntohs(((struct ip6_hdr *)ipgen)->ip6_plen) :
  179 #endif
  180                     ntohs(((struct ip *)ipgen)->ip_len);
  181                 if (act == TA_OUTPUT) {
  182                         seq = ntohl(seq);
  183                         ack = ntohl(ack);
  184                 }
  185                 if (act == TA_OUTPUT)
  186                         len -= sizeof (struct tcphdr);
  187                 if (len)
  188                         printf("[%x..%x)", seq, seq+len);
  189                 else
  190                         printf("%x", seq);
  191                 printf("@%x, urp=%x", ack, th->th_urp);
  192                 flags = th->th_flags;
  193                 if (flags) {
  194                         char *cp = "<";
  195 #define pf(f) {                                 \
  196         if (th->th_flags & TH_##f) {            \
  197                 printf("%s%s", cp, #f);         \
  198                 cp = ",";                       \
  199         }                                       \
  200 }
  201                         pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG);
  202                         printf(">");
  203                 }
  204                 break;
  205 
  206         case TA_USER:
  207                 printf("%s", prurequests[req&0xff]);
  208                 if ((req & 0xff) == PRU_SLOWTIMO)
  209                         printf("<%s>", tcptimers[req>>8]);
  210                 break;
  211         }
  212         if (tp != NULL)
  213                 printf(" -> %s", tcpstates[tp->t_state]);
  214         /* print out internal state of tp !?! */
  215         printf("\n");
  216         if (tp == NULL)
  217                 return;
  218         printf(
  219         "\trcv_(nxt,wnd,up) (%lx,%lx,%lx) snd_(una,nxt,max) (%lx,%lx,%lx)\n",
  220             (u_long)tp->rcv_nxt, (u_long)tp->rcv_wnd, (u_long)tp->rcv_up,
  221             (u_long)tp->snd_una, (u_long)tp->snd_nxt, (u_long)tp->snd_max);
  222         printf("\tsnd_(wl1,wl2,wnd) (%lx,%lx,%lx)\n",
  223             (u_long)tp->snd_wl1, (u_long)tp->snd_wl2, (u_long)tp->snd_wnd);
  224 #endif /* TCPDEBUG */
  225 }

Cache object: 1634d91a33f935011775f859d080425a


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