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("$FreeBSD$");
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 ntohs(((struct ip *)ipgen)->ip_len);
179 if (act == TA_OUTPUT) {
180 seq = ntohl(seq);
181 ack = ntohl(ack);
182 }
183 if (act == TA_OUTPUT)
184 len -= sizeof (struct tcphdr);
185 if (len)
186 printf("[%x..%x)", seq, seq+len);
187 else
188 printf("%x", seq);
189 printf("@%x, urp=%x", ack, th->th_urp);
190 flags = th->th_flags;
191 if (flags) {
192 char *cp = "<";
193 #define pf(f) { \
194 if (th->th_flags & TH_##f) { \
195 printf("%s%s", cp, #f); \
196 cp = ","; \
197 } \
198 }
199 pf(SYN); pf(ACK); pf(FIN); pf(RST); pf(PUSH); pf(URG);
200 printf(">");
201 }
202 break;
203
204 case TA_USER:
205 printf("%s", prurequests[req&0xff]);
206 if ((req & 0xff) == PRU_SLOWTIMO)
207 printf("<%s>", tcptimers[req>>8]);
208 break;
209 }
210 if (tp != NULL)
211 printf(" -> %s", tcpstates[tp->t_state]);
212 /* print out internal state of tp !?! */
213 printf("\n");
214 if (tp == NULL)
215 return;
216 printf(
217 "\trcv_(nxt,wnd,up) (%lx,%lx,%lx) snd_(una,nxt,max) (%lx,%lx,%lx)\n",
218 (u_long)tp->rcv_nxt, tp->rcv_wnd, (u_long)tp->rcv_up,
219 (u_long)tp->snd_una, (u_long)tp->snd_nxt, (u_long)tp->snd_max);
220 printf("\tsnd_(wl1,wl2,wnd) (%lx,%lx,%lx)\n",
221 (u_long)tp->snd_wl1, (u_long)tp->snd_wl2, tp->snd_wnd);
222 #endif /* TCPDEBUG */
223 }
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