4736ccfd9c
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
226 lines
5.9 KiB
C
226 lines
5.9 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1993
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* The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tcp_debug.c 8.1 (Berkeley) 6/10/93
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_tcpdebug.h"
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#ifdef TCPDEBUG
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/* load symbolic names */
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#define PRUREQUESTS
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#define TCPSTATES
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#define TCPTIMERS
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#define TANAMES
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#endif
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#ifdef INET6
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#include <netinet/ip6.h>
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#endif
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcpip.h>
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#include <netinet/tcp_debug.h>
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#ifdef TCPDEBUG
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static int tcpconsdebug = 0;
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#endif
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/*
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* Global ring buffer of TCP debugging state. Each entry captures a snapshot
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* of TCP connection state at any given moment. tcp_debx addresses at the
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* next available slot. There is no explicit export of this data structure;
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* it will be read via /dev/kmem by debugging tools.
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*/
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static struct tcp_debug tcp_debug[TCP_NDEBUG];
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static int tcp_debx;
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/*
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* All global state is protected by tcp_debug_mtx; tcp_trace() is split into
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* two parts, one of which saves connection and other state into the global
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* array (locked by tcp_debug_mtx).
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*/
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struct mtx tcp_debug_mtx;
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MTX_SYSINIT(tcp_debug_mtx, &tcp_debug_mtx, "tcp_debug_mtx", MTX_DEF);
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/*
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* Save TCP state at a given moment; optionally, both tcpcb and TCP packet
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* header state will be saved.
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*/
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void
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tcp_trace(short act, short ostate, struct tcpcb *tp, void *ipgen,
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struct tcphdr *th, int req)
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{
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#ifdef INET6
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int isipv6;
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#endif /* INET6 */
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tcp_seq seq, ack;
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int len, flags;
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struct tcp_debug *td;
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mtx_lock(&tcp_debug_mtx);
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td = &tcp_debug[tcp_debx++];
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if (tcp_debx == TCP_NDEBUG)
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tcp_debx = 0;
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bzero(td, sizeof(*td));
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#ifdef INET6
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isipv6 = (ipgen != NULL && ((struct ip *)ipgen)->ip_v == 6) ? 1 : 0;
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#endif /* INET6 */
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td->td_family =
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#ifdef INET6
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(isipv6 != 0) ? AF_INET6 :
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#endif
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AF_INET;
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#ifdef INET
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td->td_time = iptime();
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#endif
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td->td_act = act;
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td->td_ostate = ostate;
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td->td_tcb = (caddr_t)tp;
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if (tp != NULL)
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td->td_cb = *tp;
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if (ipgen != NULL) {
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switch (td->td_family) {
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#ifdef INET
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case AF_INET:
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bcopy(ipgen, &td->td_ti.ti_i, sizeof(td->td_ti.ti_i));
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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bcopy(ipgen, td->td_ip6buf, sizeof(td->td_ip6buf));
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break;
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#endif
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}
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}
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if (th != NULL) {
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switch (td->td_family) {
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#ifdef INET
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case AF_INET:
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td->td_ti.ti_t = *th;
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break;
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#endif
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#ifdef INET6
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case AF_INET6:
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td->td_ti6.th = *th;
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break;
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#endif
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}
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}
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td->td_req = req;
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mtx_unlock(&tcp_debug_mtx);
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#ifdef TCPDEBUG
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if (tcpconsdebug == 0)
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return;
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if (tp != NULL)
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printf("%p %s:", tp, tcpstates[ostate]);
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else
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printf("???????? ");
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printf("%s ", tanames[act]);
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switch (act) {
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case TA_INPUT:
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case TA_OUTPUT:
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case TA_DROP:
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if (ipgen == NULL || th == NULL)
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break;
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seq = th->th_seq;
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ack = th->th_ack;
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len =
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#ifdef INET6
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isipv6 ? ntohs(((struct ip6_hdr *)ipgen)->ip6_plen) :
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#endif
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ntohs(((struct ip *)ipgen)->ip_len);
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if (act == TA_OUTPUT) {
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seq = ntohl(seq);
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ack = ntohl(ack);
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}
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if (act == TA_OUTPUT)
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len -= sizeof (struct tcphdr);
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if (len)
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printf("[%x..%x)", seq, seq+len);
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else
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printf("%x", seq);
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printf("@%x, urp=%x", ack, th->th_urp);
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flags = th->th_flags;
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if (flags) {
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char *cp = "<";
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#define pf(f) { \
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if (th->th_flags & TH_##f) { \
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printf("%s%s", cp, #f); \
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cp = ","; \
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} \
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}
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pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG);
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printf(">");
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}
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break;
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case TA_USER:
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printf("%s", prurequests[req&0xff]);
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if ((req & 0xff) == PRU_SLOWTIMO)
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printf("<%s>", tcptimers[req>>8]);
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break;
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}
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if (tp != NULL)
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printf(" -> %s", tcpstates[tp->t_state]);
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/* print out internal state of tp !?! */
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printf("\n");
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if (tp == NULL)
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return;
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printf(
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"\trcv_(nxt,wnd,up) (%lx,%lx,%lx) snd_(una,nxt,max) (%lx,%lx,%lx)\n",
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(u_long)tp->rcv_nxt, (u_long)tp->rcv_wnd, (u_long)tp->rcv_up,
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(u_long)tp->snd_una, (u_long)tp->snd_nxt, (u_long)tp->snd_max);
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printf("\tsnd_(wl1,wl2,wnd) (%lx,%lx,%lx)\n",
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(u_long)tp->snd_wl1, (u_long)tp->snd_wl2, (u_long)tp->snd_wnd);
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#endif /* TCPDEBUG */
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}
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