diff options
Diffstat (limited to 'sys/netinet/tcp_debug.c')
| -rw-r--r-- | sys/netinet/tcp_debug.c | 224 |
1 files changed, 224 insertions, 0 deletions
diff --git a/sys/netinet/tcp_debug.c b/sys/netinet/tcp_debug.c new file mode 100644 index 0000000..5afbcde --- /dev/null +++ b/sys/netinet/tcp_debug.c @@ -0,0 +1,224 @@ +/*- + * Copyright (c) 1982, 1986, 1993 + * The Regents of the University of California. + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * @(#)tcp_debug.c 8.1 (Berkeley) 6/10/93 + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_inet.h" +#include "opt_inet6.h" +#include "opt_tcpdebug.h" + +#ifdef TCPDEBUG +/* load symbolic names */ +#define PRUREQUESTS +#define TCPSTATES +#define TCPTIMERS +#define TANAMES +#endif + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/mbuf.h> +#include <sys/mutex.h> +#include <sys/protosw.h> +#include <sys/socket.h> + +#include <netinet/in.h> +#include <netinet/in_systm.h> +#include <netinet/ip.h> +#ifdef INET6 +#include <netinet/ip6.h> +#endif +#include <netinet/ip_var.h> +#include <netinet/tcp.h> +#include <netinet/tcp_fsm.h> +#include <netinet/tcp_timer.h> +#include <netinet/tcp_var.h> +#include <netinet/tcpip.h> +#include <netinet/tcp_debug.h> + +#ifdef TCPDEBUG +static int tcpconsdebug = 0; +#endif + +/* + * Global ring buffer of TCP debugging state. Each entry captures a snapshot + * of TCP connection state at any given moment. tcp_debx addresses at the + * next available slot. There is no explicit export of this data structure; + * it will be read via /dev/kmem by debugging tools. + */ +static struct tcp_debug tcp_debug[TCP_NDEBUG]; +static int tcp_debx; + +/* + * All global state is protected by tcp_debug_mtx; tcp_trace() is split into + * two parts, one of which saves connection and other state into the global + * array (locked by tcp_debug_mtx). + */ +struct mtx tcp_debug_mtx; +MTX_SYSINIT(tcp_debug_mtx, &tcp_debug_mtx, "tcp_debug_mtx", MTX_DEF); + +/* + * Save TCP state at a given moment; optionally, both tcpcb and TCP packet + * header state will be saved. + */ +void +tcp_trace(short act, short ostate, struct tcpcb *tp, void *ipgen, + struct tcphdr *th, int req) +{ +#ifdef INET6 + int isipv6; +#endif /* INET6 */ + tcp_seq seq, ack; + int len, flags; + struct tcp_debug *td; + + mtx_lock(&tcp_debug_mtx); + td = &tcp_debug[tcp_debx++]; + if (tcp_debx == TCP_NDEBUG) + tcp_debx = 0; + bzero(td, sizeof(*td)); +#ifdef INET6 + isipv6 = (ipgen != NULL && ((struct ip *)ipgen)->ip_v == 6) ? 1 : 0; +#endif /* INET6 */ + td->td_family = +#ifdef INET6 + (isipv6 != 0) ? AF_INET6 : +#endif + AF_INET; +#ifdef INET + td->td_time = iptime(); +#endif + td->td_act = act; + td->td_ostate = ostate; + td->td_tcb = (caddr_t)tp; + if (tp != NULL) + td->td_cb = *tp; + if (ipgen != NULL) { + switch (td->td_family) { +#ifdef INET + case AF_INET: + bcopy(ipgen, &td->td_ti.ti_i, sizeof(td->td_ti.ti_i)); + break; +#endif +#ifdef INET6 + case AF_INET6: + bcopy(ipgen, td->td_ip6buf, sizeof(td->td_ip6buf)); + break; +#endif + } + } + if (th != NULL) { + switch (td->td_family) { +#ifdef INET + case AF_INET: + td->td_ti.ti_t = *th; + break; +#endif +#ifdef INET6 + case AF_INET6: + td->td_ti6.th = *th; + break; +#endif + } + } + td->td_req = req; + mtx_unlock(&tcp_debug_mtx); +#ifdef TCPDEBUG + if (tcpconsdebug == 0) + return; + if (tp != NULL) + printf("%p %s:", tp, tcpstates[ostate]); + else + printf("???????? "); + printf("%s ", tanames[act]); + switch (act) { + case TA_INPUT: + case TA_OUTPUT: + case TA_DROP: + if (ipgen == NULL || th == NULL) + break; + seq = th->th_seq; + ack = th->th_ack; + len = +#ifdef INET6 + isipv6 ? ntohs(((struct ip6_hdr *)ipgen)->ip6_plen) : +#endif + ((struct ip *)ipgen)->ip_len; + if (act == TA_OUTPUT) { + seq = ntohl(seq); + ack = ntohl(ack); + len = ntohs((u_short)len); + } + if (act == TA_OUTPUT) + len -= sizeof (struct tcphdr); + if (len) + printf("[%x..%x)", seq, seq+len); + else + printf("%x", seq); + printf("@%x, urp=%x", ack, th->th_urp); + flags = th->th_flags; + if (flags) { + char *cp = "<"; +#define pf(f) { \ + if (th->th_flags & TH_##f) { \ + printf("%s%s", cp, #f); \ + cp = ","; \ + } \ +} + pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG); + printf(">"); + } + break; + + case TA_USER: + printf("%s", prurequests[req&0xff]); + if ((req & 0xff) == PRU_SLOWTIMO) + printf("<%s>", tcptimers[req>>8]); + break; + } + if (tp != NULL) + printf(" -> %s", tcpstates[tp->t_state]); + /* print out internal state of tp !?! */ + printf("\n"); + if (tp == NULL) + return; + printf( + "\trcv_(nxt,wnd,up) (%lx,%lx,%lx) snd_(una,nxt,max) (%lx,%lx,%lx)\n", + (u_long)tp->rcv_nxt, tp->rcv_wnd, (u_long)tp->rcv_up, + (u_long)tp->snd_una, (u_long)tp->snd_nxt, (u_long)tp->snd_max); + printf("\tsnd_(wl1,wl2,wnd) (%lx,%lx,%lx)\n", + (u_long)tp->snd_wl1, (u_long)tp->snd_wl2, tp->snd_wnd); +#endif /* TCPDEBUG */ +} |
