Current Path : /sys/netinet/ |
FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
Current File : //sys/netinet/tcp_debug.c |
/*- * 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: release/9.1.0/sys/netinet/tcp_debug.c 193895 2009-06-10 10:39:41Z bz $"); #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 */ }