2 * SPDX-License-Identifier: BSD-3-Clause
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32 * @(#)tcp_debug.c 8.1 (Berkeley) 6/10/93
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 #include "opt_inet6.h"
40 #include "opt_tcpdebug.h"
43 /* load symbolic names */
50 #include <sys/param.h>
51 #include <sys/systm.h>
52 #include <sys/kernel.h>
55 #include <sys/mutex.h>
56 #include <sys/protosw.h>
57 #include <sys/socket.h>
59 #include <netinet/in.h>
60 #include <netinet/in_systm.h>
61 #include <netinet/ip.h>
63 #include <netinet/ip6.h>
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>
74 static int tcpconsdebug = 0;
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.
83 static struct tcp_debug tcp_debug[TCP_NDEBUG];
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).
91 struct mtx tcp_debug_mtx;
92 MTX_SYSINIT(tcp_debug_mtx, &tcp_debug_mtx, "tcp_debug_mtx", MTX_DEF);
95 * Save TCP state at a given moment; optionally, both tcpcb and TCP packet
96 * header state will be saved.
99 tcp_trace(short act, short ostate, struct tcpcb *tp, void *ipgen,
100 struct tcphdr *th, int req)
107 struct tcp_debug *td;
109 mtx_lock(&tcp_debug_mtx);
110 td = &tcp_debug[tcp_debx++];
111 if (tcp_debx == TCP_NDEBUG)
113 bzero(td, sizeof(*td));
115 isipv6 = (ipgen != NULL && ((struct ip *)ipgen)->ip_v == 6) ? 1 : 0;
119 (isipv6 != 0) ? AF_INET6 :
123 td->td_time = iptime();
126 td->td_ostate = ostate;
127 td->td_tcb = (caddr_t)tp;
131 switch (td->td_family) {
134 bcopy(ipgen, &td->td_ti.ti_i, sizeof(td->td_ti.ti_i));
139 bcopy(ipgen, td->td_ip6buf, sizeof(td->td_ip6buf));
145 switch (td->td_family) {
148 td->td_ti.ti_t = *th;
159 mtx_unlock(&tcp_debug_mtx);
161 if (tcpconsdebug == 0)
164 printf("%p %s:", tp, tcpstates[ostate]);
167 printf("%s ", tanames[act]);
172 if (ipgen == NULL || th == NULL)
178 isipv6 ? ntohs(((struct ip6_hdr *)ipgen)->ip6_plen) :
180 ntohs(((struct ip *)ipgen)->ip_len);
181 if (act == TA_OUTPUT) {
185 if (act == TA_OUTPUT)
186 len -= sizeof (struct tcphdr);
188 printf("[%x..%x)", seq, seq+len);
191 printf("@%x, urp=%x", ack, th->th_urp);
192 flags = th->th_flags;
196 if (th->th_flags & TH_##f) { \
197 printf("%s%s", cp, #f); \
201 pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG);
207 printf("%s", prurequests[req&0xff]);
208 if ((req & 0xff) == PRU_SLOWTIMO)
209 printf("<%s>", tcptimers[req>>8]);
213 printf(" -> %s", tcpstates[tp->t_state]);
214 /* print out internal state of tp !?! */
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 */