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  * Copyright (c) 1982, 1986, 1993
    3  *      The Regents of the University of California.
    4  * 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
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  * 4. Neither the name of the University nor the names of its contributors
   15  *    may be used to endorse or promote products derived from this software
   16  *    without specific prior written permission.
   17  *
   18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   28  * SUCH DAMAGE.
   29  *
   30  *      @(#)tcp_debug.c 8.1 (Berkeley) 6/10/93
   31  */
   32 
   33 #include <sys/cdefs.h>
   34 __FBSDID("$FreeBSD: releng/8.2/sys/netinet/tcp_debug.c 199583 2009-11-20 15:27:52Z jhb $");
   35 
   36 #include "opt_inet.h"
   37 #include "opt_inet6.h"
   38 #include "opt_tcpdebug.h"
   39 
   40 #ifdef TCPDEBUG
   41 /* load symbolic names */
   42 #define PRUREQUESTS
   43 #define TCPSTATES
   44 #define TCPTIMERS
   45 #define TANAMES
   46 #endif
   47 
   48 #include <sys/param.h>
   49 #include <sys/systm.h>
   50 #include <sys/kernel.h>
   51 #include <sys/lock.h>
   52 #include <sys/mbuf.h>
   53 #include <sys/mutex.h>
   54 #include <sys/protosw.h>
   55 #include <sys/socket.h>
   56 
   57 #include <netinet/in.h>
   58 #include <netinet/in_systm.h>
   59 #include <netinet/ip.h>
   60 #ifdef INET6
   61 #include <netinet/ip6.h>
   62 #endif
   63 #include <netinet/ip_var.h>
   64 #include <netinet/tcp.h>
   65 #include <netinet/tcp_fsm.h>
   66 #include <netinet/tcp_timer.h>
   67 #include <netinet/tcp_var.h>
   68 #include <netinet/tcpip.h>
   69 #include <netinet/tcp_debug.h>
   70 
   71 #ifdef TCPDEBUG
   72 static int              tcpconsdebug = 0;
   73 #endif
   74 
   75 /*
   76  * Global ring buffer of TCP debugging state.  Each entry captures a snapshot
   77  * of TCP connection state at any given moment.  tcp_debx addresses at the
   78  * next available slot.  There is no explicit export of this data structure;
   79  * it will be read via /dev/kmem by debugging tools.
   80  */
   81 static struct tcp_debug tcp_debug[TCP_NDEBUG];
   82 static int              tcp_debx;
   83 
   84 /*
   85  * All global state is protected by tcp_debug_mtx; tcp_trace() is split into
   86  * two parts, one of which saves connection and other state into the global
   87  * array (locked by tcp_debug_mtx).
   88  */
   89 struct mtx              tcp_debug_mtx;
   90 MTX_SYSINIT(tcp_debug_mtx, &tcp_debug_mtx, "tcp_debug_mtx", MTX_DEF);
   91 
   92 /*
   93  * Save TCP state at a given moment; optionally, both tcpcb and TCP packet
   94  * header state will be saved.
   95  */
   96 void
   97 tcp_trace(short act, short ostate, struct tcpcb *tp, void *ipgen,
   98     struct tcphdr *th, int req)
   99 {
  100 #ifdef INET6
  101         int isipv6;
  102 #endif /* INET6 */
  103         tcp_seq seq, ack;
  104         int len, flags;
  105         struct tcp_debug *td;
  106 
  107         mtx_lock(&tcp_debug_mtx);
  108         td = &tcp_debug[tcp_debx++];
  109         if (tcp_debx == TCP_NDEBUG)
  110                 tcp_debx = 0;
  111         bzero(td, sizeof(*td));
  112 #ifdef INET6
  113         isipv6 = (ipgen != NULL && ((struct ip *)ipgen)->ip_v == 6) ? 1 : 0;
  114 #endif /* INET6 */
  115         td->td_family =
  116 #ifdef INET6
  117             (isipv6 != 0) ? AF_INET6 :
  118 #endif
  119             AF_INET;
  120 #ifdef INET
  121         td->td_time = iptime();
  122 #endif
  123         td->td_act = act;
  124         td->td_ostate = ostate;
  125         td->td_tcb = (caddr_t)tp;
  126         if (tp != NULL)
  127                 td->td_cb = *tp;
  128         if (ipgen != NULL) {
  129                 switch (td->td_family) {
  130 #ifdef INET
  131                 case AF_INET:
  132                         bcopy(ipgen, &td->td_ti.ti_i, sizeof(td->td_ti.ti_i));
  133                         break;
  134 #endif
  135 #ifdef INET6
  136                 case AF_INET6:
  137                         bcopy(ipgen, td->td_ip6buf, sizeof(td->td_ip6buf));
  138                         break;
  139 #endif
  140                 }
  141         }
  142         if (th != NULL) {
  143                 switch (td->td_family) {
  144 #ifdef INET
  145                 case AF_INET:
  146                         td->td_ti.ti_t = *th;
  147                         break;
  148 #endif
  149 #ifdef INET6
  150                 case AF_INET6:
  151                         td->td_ti6.th = *th;
  152                         break;
  153 #endif
  154                 }
  155         }
  156         td->td_req = req;
  157         mtx_unlock(&tcp_debug_mtx);
  158 #ifdef TCPDEBUG
  159         if (tcpconsdebug == 0)
  160                 return;
  161         if (tp != NULL)
  162                 printf("%p %s:", tp, tcpstates[ostate]);
  163         else
  164                 printf("???????? ");
  165         printf("%s ", tanames[act]);
  166         switch (act) {
  167         case TA_INPUT:
  168         case TA_OUTPUT:
  169         case TA_DROP:
  170                 if (ipgen == NULL || th == NULL)
  171                         break;
  172                 seq = th->th_seq;
  173                 ack = th->th_ack;
  174                 len =
  175 #ifdef INET6
  176                     isipv6 ? ntohs(((struct ip6_hdr *)ipgen)->ip6_plen) :
  177 #endif
  178                     ((struct ip *)ipgen)->ip_len;
  179                 if (act == TA_OUTPUT) {
  180                         seq = ntohl(seq);
  181                         ack = ntohl(ack);
  182                         len = ntohs((u_short)len);
  183                 }
  184                 if (act == TA_OUTPUT)
  185                         len -= sizeof (struct tcphdr);
  186                 if (len)
  187                         printf("[%x..%x)", seq, seq+len);
  188                 else
  189                         printf("%x", seq);
  190                 printf("@%x, urp=%x", ack, th->th_urp);
  191                 flags = th->th_flags;
  192                 if (flags) {
  193                         char *cp = "<";
  194 #define pf(f) {                                 \
  195         if (th->th_flags & TH_##f) {            \
  196                 printf("%s%s", cp, #f);         \
  197                 cp = ",";                       \
  198         }                                       \
  199 }
  200                         pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG);
  201                         printf(">");
  202                 }
  203                 break;
  204 
  205         case TA_USER:
  206                 printf("%s", prurequests[req&0xff]);
  207                 if ((req & 0xff) == PRU_SLOWTIMO)
  208                         printf("<%s>", tcptimers[req>>8]);
  209                 break;
  210         }
  211         if (tp != NULL)
  212                 printf(" -> %s", tcpstates[tp->t_state]);
  213         /* print out internal state of tp !?! */
  214         printf("\n");
  215         if (tp == NULL)
  216                 return;
  217         printf(
  218         "\trcv_(nxt,wnd,up) (%lx,%lx,%lx) snd_(una,nxt,max) (%lx,%lx,%lx)\n",
  219             (u_long)tp->rcv_nxt, tp->rcv_wnd, (u_long)tp->rcv_up,
  220             (u_long)tp->snd_una, (u_long)tp->snd_nxt, (u_long)tp->snd_max);
  221         printf("\tsnd_(wl1,wl2,wnd) (%lx,%lx,%lx)\n",
  222             (u_long)tp->snd_wl1, (u_long)tp->snd_wl2, tp->snd_wnd);
  223 #endif /* TCPDEBUG */
  224 }

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