2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2016-2018 Netflix, Inc.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
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.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #ifndef __tcp_log_buf_h__
31 #define __tcp_log_buf_h__
33 #define TCP_LOG_REASON_LEN 32
34 #define TCP_LOG_TAG_LEN 32
35 #define TCP_LOG_BUF_VER (9)
38 * Because the (struct tcp_log_buffer) includes 8-byte uint64_t's, it requires
39 * 8-byte alignment to work properly on all platforms. Therefore, we will
40 * enforce 8-byte alignment for all the structures that may appear by
41 * themselves (instead of being embedded in another structure) in a data
44 #define ALIGN_TCP_LOG __aligned(8)
46 /* Information about the socketbuffer state. */
47 struct tcp_log_sockbuf
49 uint32_t tls_sb_acc; /* available chars (sb->sb_acc) */
50 uint32_t tls_sb_ccc; /* claimed chars (sb->sb_ccc) */
51 uint32_t tls_sb_spare; /* spare */
54 /* Optional, verbose information that may be appended to an event log. */
55 struct tcp_log_verbose
57 #define TCP_FUNC_LEN 32
58 char tlv_snd_frm[TCP_FUNC_LEN]; /* tcp_output() caller */
59 char tlv_trace_func[TCP_FUNC_LEN]; /* Function that
61 uint32_t tlv_trace_line; /* Line number that generated trace */
65 /* Internal RACK state variables. */
68 uint32_t tlr_rack_rtt; /* rc_rack_rtt */
69 uint8_t tlr_state; /* Internal RACK state */
70 uint8_t _pad[3]; /* Padding */
74 uint64_t cur_del_rate;
104 /* Per-stack stack-specific info. */
105 union tcp_log_stackspecific
107 struct tcp_log_rack u_rack;
108 struct tcp_log_bbr u_bbr;
111 struct tcp_log_buffer
114 struct timeval tlb_tv; /* Timestamp of trace */
115 uint32_t tlb_ticks; /* Timestamp of trace */
116 uint32_t tlb_sn; /* Serial number */
117 uint8_t tlb_stackid; /* Stack ID */
118 uint8_t tlb_eventid; /* Event ID */
119 uint16_t tlb_eventflags; /* Flags for the record */
120 #define TLB_FLAG_RXBUF 0x0001 /* Includes receive buffer info */
121 #define TLB_FLAG_TXBUF 0x0002 /* Includes send buffer info */
122 #define TLB_FLAG_HDR 0x0004 /* Includes a TCP header */
123 #define TLB_FLAG_VERBOSE 0x0008 /* Includes function/line numbers */
124 #define TLB_FLAG_STACKINFO 0x0010 /* Includes stack-specific info */
125 int tlb_errno; /* Event error (if any) */
127 /* Internal session state */
128 struct tcp_log_sockbuf tlb_rxbuf; /* Receive buffer */
129 struct tcp_log_sockbuf tlb_txbuf; /* Send buffer */
131 int tlb_state; /* TCPCB t_state */
132 uint32_t tlb_starttime; /* TCPCB t_starttime */
133 uint32_t tlb_iss; /* TCPCB iss */
134 uint32_t tlb_flags; /* TCPCB flags */
135 uint32_t tlb_snd_una; /* TCPCB snd_una */
136 uint32_t tlb_snd_max; /* TCPCB snd_max */
137 uint32_t tlb_snd_cwnd; /* TCPCB snd_cwnd */
138 uint32_t tlb_snd_nxt; /* TCPCB snd_nxt */
139 uint32_t tlb_snd_recover;/* TCPCB snd_recover */
140 uint32_t tlb_snd_wnd; /* TCPCB snd_wnd */
141 uint32_t tlb_snd_ssthresh; /* TCPCB snd_ssthresh */
142 uint32_t tlb_srtt; /* TCPCB t_srtt */
143 uint32_t tlb_rttvar; /* TCPCB t_rttvar */
144 uint32_t tlb_rcv_up; /* TCPCB rcv_up */
145 uint32_t tlb_rcv_adv; /* TCPCB rcv_adv */
146 uint32_t tlb_flags2; /* TCPCB t_flags2 */
147 uint32_t tlb_rcv_nxt; /* TCPCB rcv_nxt */
148 uint32_t tlb_rcv_wnd; /* TCPCB rcv_wnd */
149 uint32_t tlb_dupacks; /* TCPCB t_dupacks */
150 int tlb_segqlen; /* TCPCB segqlen */
151 int tlb_snd_numholes; /* TCPCB snd_numholes */
152 uint32_t tlb_flex1; /* Event specific information */
153 uint32_t tlb_flex2; /* Event specific information */
154 uint32_t tlb_fbyte_in; /* TCPCB first byte in time */
155 uint32_t tlb_fbyte_out; /* TCPCB first byte out time */
156 uint8_t tlb_snd_scale:4, /* TCPCB snd_scale */
157 tlb_rcv_scale:4; /* TCPCB rcv_scale */
158 uint8_t _pad[3]; /* Padding */
161 union tcp_log_stackspecific tlb_stackinfo;
162 #define tlb_rack tlb_stackinfo.u_rack
165 uint32_t tlb_len; /* The packet's data length */
166 struct tcphdr tlb_th; /* The TCP header */
167 uint8_t tlb_opts[TCP_MAXOLEN]; /* The TCP options */
169 /* Verbose information (optional) */
170 struct tcp_log_verbose tlb_verbose[0];
173 enum tcp_log_events {
174 TCP_LOG_IN = 1, /* Incoming packet 1 */
175 TCP_LOG_OUT, /* Transmit (without other event) 2 */
176 TCP_LOG_RTO, /* Retransmit timeout 3 */
177 TCP_LOG_SB_WAKE, /* Awaken socket buffer 4 */
178 TCP_LOG_BAD_RETRAN, /* Detected bad retransmission 5 */
179 TCP_LOG_PRR, /* Doing PRR 6 */
180 TCP_LOG_REORDER, /* Detected reorder 7 */
181 TCP_LOG_HPTS, /* Hpts sending a packet 8 */
182 BBR_LOG_BBRUPD, /* We updated BBR info 9 */
183 BBR_LOG_BBRSND, /* We did a slot calculation and sending is done 10 */
184 BBR_LOG_ACKCLEAR, /* A ack clears all outstanding 11 */
185 BBR_LOG_INQUEUE, /* The tcb had a packet input to it 12 */
186 BBR_LOG_TIMERSTAR, /* Start a timer 13 */
187 BBR_LOG_TIMERCANC, /* Cancel a timer 14 */
188 BBR_LOG_ENTREC, /* Entered recovery 15 */
189 BBR_LOG_EXITREC, /* Exited recovery 16 */
190 BBR_LOG_CWND, /* Cwnd change 17 */
191 BBR_LOG_BWSAMP, /* LT B/W sample has been made 18 */
192 BBR_LOG_MSGSIZE, /* We received a EMSGSIZE error 19 */
193 BBR_LOG_BBRRTT, /* BBR RTT is updated 20 */
194 BBR_LOG_JUSTRET, /* We just returned out of output 21 */
195 BBR_LOG_STATE, /* A BBR state change occurred 22 */
196 BBR_LOG_PKT_EPOCH, /* A BBR packet epoch occurred 23 */
197 BBR_LOG_PERSIST, /* BBR changed to/from a persists 24 */
198 TCP_LOG_FLOWEND, /* End of a flow 25 */
199 BBR_LOG_RTO, /* BBR's timeout includes BBR info 26 */
200 BBR_LOG_DOSEG_DONE, /* hpts do_segment completes 27 */
201 BBR_LOG_EXIT_GAIN, /* hpts do_segment completes 28 */
202 BBR_LOG_THRESH_CALC, /* Doing threshold calculation 29 */
203 TCP_LOG_MAPCHG, /* Map Changes to the sendmap 30 */
204 TCP_LOG_USERSEND, /* User level sends data 31 */
205 BBR_RSM_CLEARED, /* RSM cleared of ACK flags 32 */
206 BBR_LOG_STATE_TARGET, /* Log of target at state 33 */
207 BBR_LOG_TIME_EPOCH, /* A timed based Epoch occurred 34 */
208 BBR_LOG_TO_PROCESS, /* A to was processed 35 */
209 BBR_LOG_BBRTSO, /* TSO update 36 */
210 BBR_LOG_HPTSDIAG, /* Hpts diag insert 37 */
211 BBR_LOG_LOWGAIN, /* Low gain accounting 38 */
212 BBR_LOG_PROGRESS, /* Progress timer event 39 */
213 TCP_LOG_SOCKET_OPT, /* A socket option is set 40 */
214 BBR_LOG_TIMERPREP, /* A BBR var to debug out TLP issues 41 */
215 BBR_LOG_ENOBUF_JMP, /* We had a enobuf jump 42 */
216 BBR_LOG_HPTSI_CALC, /* calc the hptsi time 43 */
217 BBR_LOG_RTT_SHRINKS, /* We had a log reduction of rttProp 44 */
218 BBR_LOG_BW_RED_EV, /* B/W reduction events 45 */
219 BBR_LOG_REDUCE, /* old bbr log reduce for 4.1 and earlier 46*/
220 TCP_LOG_RTT, /* A rtt (in useconds) is being sampled and applied to the srtt algo 47 */
221 BBR_LOG_SETTINGS_CHG, /* Settings changed for loss response 48 */
222 BBR_LOG_SRTT_GAIN_EVENT, /* SRTT gaining -- now not used 49 */
223 TCP_LOG_REASS, /* Reassembly buffer logging 50 */
224 TCP_HDWR_PACE_SIZE, /* TCP pacing size set (rl and rack uses this) 51 */
225 BBR_LOG_HDWR_PACE, /* TCP Hardware pacing log 52 */
226 BBR_LOG_TSTMP_VAL, /* Temp debug timestamp validation 53 */
227 TCP_LOG_CONNEND, /* End of connection 54 */
228 TCP_LOG_LRO, /* LRO entry 55 */
229 TCP_SACK_FILTER_RES, /* Results of SACK Filter 56 */
230 TCP_SAD_DETECTION, /* Sack Attack Detection 57 */
231 TCP_TIMELY_WORK, /* Logs regarding Timely CC tweaks 58 */
232 TCP_LOG_USER_EVENT, /* User space event data 59 */
233 TCP_LOG_SENDFILE, /* sendfile() logging for TCP connections 60 */
234 TCP_LOG_HTTP_T, /* logging of http request tracking 61 */
235 TCP_LOG_ACCOUNTING, /* Log of TCP Accounting data 62 */
236 TCP_LOG_FSB, /* FSB information 63 */
237 RACK_DSACK_HANDLING, /* Handling of DSACK in rack for reordering window 64 */
238 TCP_HYSTART, /* TCP Hystart logging 65 */
239 TCP_CHG_QUERY, /* Change query during fnc_init() 66 */
240 TCP_RACK_LOG_COLLAPSE, /* Window collapse by peer 67 */
241 TCP_LOG_END /* End (keep at end) 68 */
244 enum tcp_log_states {
245 TCP_LOG_STATE_CLEAR = -1, /* Deactivate and clear tracing */
246 TCP_LOG_STATE_OFF = 0, /* Pause */
247 TCP_LOG_STATE_TAIL=1, /* Keep the trailing events */
248 TCP_LOG_STATE_HEAD=2, /* Keep the leading events */
249 TCP_LOG_STATE_HEAD_AUTO=3, /* Keep the leading events, and
250 automatically dump them to the
252 TCP_LOG_STATE_CONTINUAL=4, /* Continually dump the data when full */
253 TCP_LOG_STATE_TAIL_AUTO=5, /* Keep the trailing events, and
254 automatically dump them when the
258 /* Use this if we don't know whether the operation succeeded. */
259 #define ERRNO_UNK (-1)
262 * If the user included dev/tcp_log/tcp_log_dev.h, then include our private
263 * headers. Otherwise, there is no reason to pollute all the files with an
264 * additional include.
266 * This structure is aligned to an 8-byte boundary to match the alignment
267 * requirements of (struct tcp_log_buffer).
269 #ifdef __tcp_log_dev_h__
270 struct tcp_log_header {
271 struct tcp_log_common_header tlh_common;
272 #define tlh_version tlh_common.tlch_version
273 #define tlh_type tlh_common.tlch_type
274 #define tlh_length tlh_common.tlch_length
275 struct in_endpoints tlh_ie;
276 struct timeval tlh_offset; /* Uptime -> UTC offset */
277 char tlh_id[TCP_LOG_ID_LEN];
278 char tlh_reason[TCP_LOG_REASON_LEN];
279 char tlh_tag[TCP_LOG_TAG_LEN];
285 struct tcp_log_dev_log_queue {
286 struct tcp_log_dev_queue tldl_common;
287 char tldl_id[TCP_LOG_ID_LEN];
288 char tldl_reason[TCP_LOG_REASON_LEN];
289 char tldl_tag[TCP_LOG_TAG_LEN];
290 struct in_endpoints tldl_ie;
291 struct tcp_log_stailq tldl_entries;
296 #endif /* __tcp_log_dev_h__ */
300 #define TCP_LOG_BUF_DEFAULT_SESSION_LIMIT 5000
301 #define TCP_LOG_BUF_DEFAULT_GLOBAL_LIMIT 5000000
304 * TCP_LOG_EVENT_VERBOSE: The same as TCP_LOG_EVENT, except it always
305 * tries to record verbose information.
307 #define TCP_LOG_EVENT_VERBOSE(tp, th, rxbuf, txbuf, eventid, errornum, len, stackinfo, th_hostorder, tv) \
309 if (tp->t_logstate != TCP_LOG_STATE_OFF) \
310 tcp_log_event_(tp, th, rxbuf, txbuf, eventid, \
311 errornum, len, stackinfo, th_hostorder, \
312 tp->t_output_caller, __func__, __LINE__, tv);\
316 * TCP_LOG_EVENT: This is a macro so we can capture function/line
317 * information when needed.
320 * TCP_LOG_EVENT(struct tcpcb *tp, struct tcphdr *th, struct sockbuf *rxbuf,
321 * struct sockbuf *txbuf, uint8_t eventid, int errornum,
322 * union tcp_log_stackspecific *stackinfo)
324 * tp is mandatory and must be write locked.
325 * th is optional; if present, it will appear in the record.
326 * rxbuf and txbuf are optional; if present, they will appear in the record.
327 * eventid is mandatory.
328 * errornum is mandatory (it indicates the success or failure of the
329 * operation associated with the event).
330 * len indicates the length of the packet. If no packet, use 0.
331 * stackinfo is optional; if present, it will appear in the record.
334 #ifdef TCP_LOG_FORCEVERBOSE
335 #define TCP_LOG_EVENT TCP_LOG_EVENT_VERBOSE
337 #define TCP_LOG_EVENT(tp, th, rxbuf, txbuf, eventid, errornum, len, stackinfo, th_hostorder) \
339 if (tcp_log_verbose) \
340 TCP_LOG_EVENT_VERBOSE(tp, th, rxbuf, txbuf, \
341 eventid, errornum, len, stackinfo, \
342 th_hostorder, NULL); \
343 else if (tp->t_logstate != TCP_LOG_STATE_OFF) \
344 tcp_log_event_(tp, th, rxbuf, txbuf, eventid, \
345 errornum, len, stackinfo, th_hostorder, \
346 NULL, NULL, 0, NULL); \
348 #endif /* TCP_LOG_FORCEVERBOSE */
349 #define TCP_LOG_EVENTP(tp, th, rxbuf, txbuf, eventid, errornum, len, stackinfo, th_hostorder, tv) \
351 if (tp->t_logstate != TCP_LOG_STATE_OFF) \
352 tcp_log_event_(tp, th, rxbuf, txbuf, eventid, \
353 errornum, len, stackinfo, th_hostorder, \
354 NULL, NULL, 0, tv); \
358 extern bool tcp_log_verbose;
359 void tcp_log_drain(struct tcpcb *tp);
360 int tcp_log_dump_tp_logbuf(struct tcpcb *tp, char *reason, int how, bool force);
361 void tcp_log_dump_tp_bucket_logbufs(struct tcpcb *tp, char *reason);
362 struct tcp_log_buffer *tcp_log_event_(struct tcpcb *tp, struct tcphdr *th, struct sockbuf *rxbuf,
363 struct sockbuf *txbuf, uint8_t eventid, int errornum, uint32_t len,
364 union tcp_log_stackspecific *stackinfo, int th_hostorder,
365 const char *output_caller, const char *func, int line, const struct timeval *tv);
366 size_t tcp_log_get_id(struct tcpcb *tp, char *buf);
367 size_t tcp_log_get_tag(struct tcpcb *tp, char *buf);
368 u_int tcp_log_get_id_cnt(struct tcpcb *tp);
369 int tcp_log_getlogbuf(struct sockopt *sopt, struct tcpcb *tp);
370 void tcp_log_init(void);
371 int tcp_log_set_id(struct tcpcb *tp, char *id);
372 int tcp_log_set_tag(struct tcpcb *tp, char *tag);
373 int tcp_log_state_change(struct tcpcb *tp, int state);
374 void tcp_log_tcpcbinit(struct tcpcb *tp);
375 void tcp_log_tcpcbfini(struct tcpcb *tp);
376 void tcp_log_flowend(struct tcpcb *tp);
377 #else /* !TCP_BLACKBOX */
378 #define tcp_log_verbose (false)
380 static inline struct tcp_log_buffer *
381 tcp_log_event_(struct tcpcb *tp, struct tcphdr *th, struct sockbuf *rxbuf,
382 struct sockbuf *txbuf, uint8_t eventid, int errornum, uint32_t len,
383 union tcp_log_stackspecific *stackinfo, int th_hostorder,
384 const char *output_caller, const char *func, int line,
385 const struct timeval *tv)
390 #endif /* TCP_BLACKBOX */
393 #endif /* __tcp_log_buf_h__ */