Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/netinet/tcp_log_buf.h
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2016-2018 5 * Netflix Inc. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * $FreeBSD: releng/12.0/sys/netinet/tcp_log_buf.h 338102 2018-08-20 12:43:18Z rrs $ 29 */ 30 31 #ifndef __tcp_log_buf_h__ 32 #define __tcp_log_buf_h__ 33 34 #define TCP_LOG_REASON_LEN 32 35 #define TCP_LOG_BUF_VER (6) 36 37 /* 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 42 * stream. 43 */ 44 #define ALIGN_TCP_LOG __aligned(8) 45 46 /* Information about the socketbuffer state. */ 47 struct tcp_log_sockbuf 48 { 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 */ 52 }; 53 54 /* Optional, verbose information that may be appended to an event log. */ 55 struct tcp_log_verbose 56 { 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 60 generated trace */ 61 uint32_t tlv_trace_line; /* Line number that generated trace */ 62 uint8_t _pad[4]; 63 } ALIGN_TCP_LOG; 64 65 /* Internal RACK state variables. */ 66 struct tcp_log_rack 67 { 68 uint32_t tlr_rack_rtt; /* rc_rack_rtt */ 69 uint8_t tlr_state; /* Internal RACK state */ 70 uint8_t _pad[3]; /* Padding */ 71 }; 72 73 struct tcp_log_bbr { 74 uint64_t cur_del_rate; 75 uint64_t delRate; 76 uint64_t rttProp; 77 uint64_t bw_inuse; 78 uint32_t inflight; 79 uint32_t applimited; 80 uint32_t delivered; 81 uint32_t timeStamp; 82 uint32_t epoch; 83 uint32_t lt_epoch; 84 uint32_t pkts_out; 85 uint32_t flex1; 86 uint32_t flex2; 87 uint32_t flex3; 88 uint32_t flex4; 89 uint32_t flex5; 90 uint32_t flex6; 91 uint32_t lost; 92 uint16_t pacing_gain; 93 uint16_t cwnd_gain; 94 uint16_t flex7; 95 uint8_t bbr_state; 96 uint8_t bbr_substate; 97 uint8_t inhpts; 98 uint8_t ininput; 99 uint8_t use_lt_bw; 100 uint8_t flex8; 101 uint32_t pkt_epoch; 102 }; 103 104 /* Per-stack stack-specific info. */ 105 union tcp_log_stackspecific 106 { 107 struct tcp_log_rack u_rack; 108 struct tcp_log_bbr u_bbr; 109 }; 110 111 struct tcp_log_buffer 112 { 113 /* Event basics */ 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) */ 126 127 /* Internal session state */ 128 struct tcp_log_sockbuf tlb_rxbuf; /* Receive buffer */ 129 struct tcp_log_sockbuf tlb_txbuf; /* Send buffer */ 130 131 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_rcv_nxt; /* TCPCB rcv_nxt */ 147 tcp_seq tlb_sack_newdata; /* TCPCB sack_newdata */ 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 uint8_t tlb_snd_scale:4, /* TCPCB snd_scale */ 155 tlb_rcv_scale:4; /* TCPCB rcv_scale */ 156 uint8_t _pad[3]; /* Padding */ 157 158 /* Per-stack info */ 159 union tcp_log_stackspecific tlb_stackinfo; 160 #define tlb_rack tlb_stackinfo.u_rack 161 162 /* The packet */ 163 uint32_t tlb_len; /* The packet's data length */ 164 struct tcphdr tlb_th; /* The TCP header */ 165 uint8_t tlb_opts[TCP_MAXOLEN]; /* The TCP options */ 166 167 /* Verbose information (optional) */ 168 struct tcp_log_verbose tlb_verbose[0]; 169 } ALIGN_TCP_LOG; 170 171 enum tcp_log_events { 172 TCP_LOG_IN = 1, /* Incoming packet 1 */ 173 TCP_LOG_OUT, /* Transmit (without other event) 2 */ 174 TCP_LOG_RTO, /* Retransmit timeout 3 */ 175 TCP_LOG_TF_ACK, /* Transmit due to TF_ACK 4 */ 176 TCP_LOG_BAD_RETRAN, /* Detected bad retransmission 5 */ 177 TCP_LOG_PRR, /* Doing PRR 6 */ 178 TCP_LOG_REORDER,/* Detected reorder 7 */ 179 TCP_LOG_PACER, /* Pacer sending a packet 8 */ 180 BBR_LOG_BBRUPD, /* We updated BBR info 9 */ 181 BBR_LOG_BBRSND, /* We did a slot calculation and sending is done 10 */ 182 BBR_LOG_ACKCLEAR, /* A ack clears all outstanding 11 */ 183 BBR_LOG_INQUEUE, /* The tcb had a packet input to it 12 */ 184 BBR_LOG_TIMERSTAR, /* Start a timer 13 */ 185 BBR_LOG_TIMERCANC, /* Cancel a timer 14 */ 186 BBR_LOG_ENTREC, /* Entered recovery 15 */ 187 BBR_LOG_EXITREC, /* Exited recovery 16 */ 188 BBR_LOG_CWND, /* Cwnd change 17 */ 189 BBR_LOG_BWSAMP, /* LT B/W sample has been made 18 */ 190 BBR_LOG_MSGSIZE, /* We received a EMSGSIZE error 19 */ 191 BBR_LOG_BBRRTT, /* BBR RTT is updated 20 */ 192 BBR_LOG_JUSTRET, /* We just returned out of output 21 */ 193 BBR_LOG_STATE, /* A BBR state change occured 22 */ 194 BBR_LOG_PKT_EPOCH, /* A BBR packet epoch occured 23 */ 195 BBR_LOG_PERSIST, /* BBR changed to/from a persists 24 */ 196 TCP_LOG_FLOWEND, /* End of a flow 25 */ 197 BBR_LOG_RTO, /* BBR's timeout includes BBR info 26 */ 198 BBR_LOG_DOSEG_DONE, /* pacer do_segment completes 27 */ 199 BBR_LOG_EXIT_GAIN, /* pacer do_segment completes 28 */ 200 BBR_LOG_THRESH_CALC, /* Doing threshold calculation 29 */ 201 BBR_LOG_EXTRACWNDGAIN, /* Removed 30 */ 202 TCP_LOG_USERSEND, /* User level sends data 31 */ 203 UNUSED_32, /* Unused 32 */ 204 UNUSED_33, /* Unused 33 */ 205 BBR_LOG_TIME_EPOCH, /* A timed based Epoch occured 34 */ 206 BBR_LOG_TO_PROCESS, /* A to was processed 35 */ 207 BBR_LOG_BBRTSO, /* TSO update 36 */ 208 BBR_LOG_PACERDIAG, /* Pacer diag insert 37 */ 209 BBR_LOG_LOWGAIN, /* Low gain accounting 38 */ 210 BBR_LOG_PROGRESS, /* Progress timer event 39 */ 211 TCP_LOG_SOCKET_OPT, /* A socket option is set 40 */ 212 BBR_LOG_TIMERPREP, /* A BBR var to debug out TLP issues 41 */ 213 BBR_LOG_ENOBUF_JMP, /* We had a enobuf jump 42 */ 214 BBR_LOG_PACING_CALC, /* calc the pacing time 43 */ 215 BBR_LOG_RTT_SHRINKS, /* We had a log reduction of rttProp 44 */ 216 BBR_LOG_BW_RED_EV, /* B/W reduction events 45 */ 217 BBR_LOG_REDUCE, /* old bbr log reduce for 4.1 and earlier 46*/ 218 TCP_LOG_RTT, /* A rtt (in useconds) is being sampled and applied to the srtt algo 47 */ 219 BBR_LOG_SETTINGS_CHG, /* Settings changed for loss response 48 */ 220 BBR_LOG_SRTT_GAIN_EVENT, /* SRTT gaining 49 */ 221 TCP_LOG_REASS, /* Reassembly buffer logging 50 */ 222 TCP_LOG_END /* End (keep at end) 51 */ 223 }; 224 225 enum tcp_log_states { 226 TCP_LOG_STATE_CLEAR = -1, /* Deactivate and clear tracing */ 227 TCP_LOG_STATE_OFF = 0, /* Pause */ 228 TCP_LOG_STATE_TAIL=1, /* Keep the trailing events */ 229 TCP_LOG_STATE_HEAD=2, /* Keep the leading events */ 230 TCP_LOG_STATE_HEAD_AUTO=3, /* Keep the leading events, and 231 automatically dump them to the 232 device */ 233 TCP_LOG_STATE_CONTINUAL=4, /* Continually dump the data when full */ 234 TCP_LOG_STATE_TAIL_AUTO=5, /* Keep the trailing events, and 235 automatically dump them when the 236 session ends */ 237 }; 238 239 /* Use this if we don't know whether the operation succeeded. */ 240 #define ERRNO_UNK (-1) 241 242 /* 243 * If the user included dev/tcp_log/tcp_log_dev.h, then include our private 244 * headers. Otherwise, there is no reason to pollute all the files with an 245 * additional include. 246 * 247 * This structure is aligned to an 8-byte boundary to match the alignment 248 * requirements of (struct tcp_log_buffer). 249 */ 250 #ifdef __tcp_log_dev_h__ 251 struct tcp_log_header { 252 struct tcp_log_common_header tlh_common; 253 #define tlh_version tlh_common.tlch_version 254 #define tlh_type tlh_common.tlch_type 255 #define tlh_length tlh_common.tlch_length 256 struct in_endpoints tlh_ie; 257 struct timeval tlh_offset; /* Uptime -> UTC offset */ 258 char tlh_id[TCP_LOG_ID_LEN]; 259 char tlh_reason[TCP_LOG_REASON_LEN]; 260 uint8_t tlh_af; 261 uint8_t _pad[7]; 262 } ALIGN_TCP_LOG; 263 264 #ifdef _KERNEL 265 struct tcp_log_dev_log_queue { 266 struct tcp_log_dev_queue tldl_common; 267 char tldl_id[TCP_LOG_ID_LEN]; 268 char tldl_reason[TCP_LOG_REASON_LEN]; 269 struct in_endpoints tldl_ie; 270 struct tcp_log_stailq tldl_entries; 271 int tldl_count; 272 uint8_t tldl_af; 273 }; 274 #endif /* _KERNEL */ 275 #endif /* __tcp_log_dev_h__ */ 276 277 #ifdef _KERNEL 278 279 #define TCP_LOG_BUF_DEFAULT_SESSION_LIMIT 10000 280 #define TCP_LOG_BUF_DEFAULT_GLOBAL_LIMIT 1000000 281 282 /* 283 * TCP_LOG_EVENT_VERBOSE: The same as TCP_LOG_EVENT, except it always 284 * tries to record verbose information. 285 */ 286 #define TCP_LOG_EVENT_VERBOSE(tp, th, rxbuf, txbuf, eventid, errornum, len, stackinfo, th_hostorder, tv) \ 287 do { \ 288 if (tp->t_logstate != TCP_LOG_STATE_OFF) \ 289 tcp_log_event_(tp, th, rxbuf, txbuf, eventid, \ 290 errornum, len, stackinfo, th_hostorder, \ 291 tp->t_output_caller, __func__, __LINE__, tv); \ 292 } while (0) 293 294 /* 295 * TCP_LOG_EVENT: This is a macro so we can capture function/line 296 * information when needed. 297 * 298 * Prototype: 299 * TCP_LOG_EVENT(struct tcpcb *tp, struct tcphdr *th, struct sockbuf *rxbuf, 300 * struct sockbuf *txbuf, uint8_t eventid, int errornum, 301 * union tcp_log_stackspecific *stackinfo) 302 * 303 * tp is mandatory and must be write locked. 304 * th is optional; if present, it will appear in the record. 305 * rxbuf and txbuf are optional; if present, they will appear in the record. 306 * eventid is mandatory. 307 * errornum is mandatory (it indicates the success or failure of the 308 * operation associated with the event). 309 * len indicates the length of the packet. If no packet, use 0. 310 * stackinfo is optional; if present, it will appear in the record. 311 */ 312 #ifdef TCP_LOG_FORCEVERBOSE 313 #define TCP_LOG_EVENT TCP_LOG_EVENT_VERBOSE 314 #else 315 #define TCP_LOG_EVENT(tp, th, rxbuf, txbuf, eventid, errornum, len, stackinfo, th_hostorder) \ 316 do { \ 317 if (tcp_log_verbose) \ 318 TCP_LOG_EVENT_VERBOSE(tp, th, rxbuf, txbuf, \ 319 eventid, errornum, len, stackinfo, \ 320 th_hostorder, NULL); \ 321 else if (tp->t_logstate != TCP_LOG_STATE_OFF) \ 322 tcp_log_event_(tp, th, rxbuf, txbuf, eventid, \ 323 errornum, len, stackinfo, th_hostorder, \ 324 NULL, NULL, 0, NULL); \ 325 } while (0) 326 #endif /* TCP_LOG_FORCEVERBOSE */ 327 #define TCP_LOG_EVENTP(tp, th, rxbuf, txbuf, eventid, errornum, len, stackinfo, th_hostorder, tv) \ 328 do { \ 329 if (tp->t_logstate != TCP_LOG_STATE_OFF) \ 330 tcp_log_event_(tp, th, rxbuf, txbuf, eventid, \ 331 errornum, len, stackinfo, th_hostorder, \ 332 NULL, NULL, 0, tv); \ 333 } while (0) 334 335 336 #ifdef TCP_BLACKBOX 337 extern bool tcp_log_verbose; 338 void tcp_log_drain(struct tcpcb *tp); 339 int tcp_log_dump_tp_logbuf(struct tcpcb *tp, char *reason, int how, bool force); 340 void tcp_log_dump_tp_bucket_logbufs(struct tcpcb *tp, char *reason); 341 struct tcp_log_buffer *tcp_log_event_(struct tcpcb *tp, struct tcphdr *th, struct sockbuf *rxbuf, 342 struct sockbuf *txbuf, uint8_t eventid, int errornum, uint32_t len, 343 union tcp_log_stackspecific *stackinfo, int th_hostorder, 344 const char *output_caller, const char *func, int line, const struct timeval *tv); 345 size_t tcp_log_get_id(struct tcpcb *tp, char *buf); 346 u_int tcp_log_get_id_cnt(struct tcpcb *tp); 347 int tcp_log_getlogbuf(struct sockopt *sopt, struct tcpcb *tp); 348 void tcp_log_init(void); 349 int tcp_log_set_id(struct tcpcb *tp, char *id); 350 int tcp_log_state_change(struct tcpcb *tp, int state); 351 void tcp_log_tcpcbinit(struct tcpcb *tp); 352 void tcp_log_tcpcbfini(struct tcpcb *tp); 353 void tcp_log_flowend(struct tcpcb *tp); 354 #else /* !TCP_BLACKBOX */ 355 #define tcp_log_verbose (false) 356 357 static inline struct tcp_log_buffer * 358 tcp_log_event_(struct tcpcb *tp, struct tcphdr *th, struct sockbuf *rxbuf, 359 struct sockbuf *txbuf, uint8_t eventid, int errornum, uint32_t len, 360 union tcp_log_stackspecific *stackinfo, int th_hostorder, 361 const char *output_caller, const char *func, int line, 362 const struct timeval *tv) 363 { 364 365 return (NULL); 366 } 367 #endif /* TCP_BLACKBOX */ 368 369 #endif /* _KERNEL */ 370 #endif /* __tcp_log_buf_h__ */
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