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31 * @(#)tcp_var.h 8.4 (Berkeley) 5/24/95
35 #ifndef _NETINET_TCP_VAR_H_
36 #define _NETINET_TCP_VAR_H_
38 #include <netinet/tcp.h>
39 #include <netinet/tcp_fsm.h>
42 #include "opt_kern_tls.h"
48 #define TCP_END_BYTE_INFO 8 /* Bytes that makeup the "end information array" */
49 /* Types of ending byte info */
50 #define TCP_EI_EMPTY_SLOT 0
51 #define TCP_EI_STATUS_CLIENT_FIN 0x1
52 #define TCP_EI_STATUS_CLIENT_RST 0x2
53 #define TCP_EI_STATUS_SERVER_FIN 0x3
54 #define TCP_EI_STATUS_SERVER_RST 0x4
55 #define TCP_EI_STATUS_RETRAN 0x5
56 #define TCP_EI_STATUS_PROGRESS 0x6
57 #define TCP_EI_STATUS_PERSIST_MAX 0x7
58 #define TCP_EI_STATUS_KEEP_MAX 0x8
59 #define TCP_EI_STATUS_DATA_A_CLOSE 0x9
60 #define TCP_EI_STATUS_RST_IN_FRONT 0xa
61 #define TCP_EI_STATUS_2MSL 0xb
62 #define TCP_EI_STATUS_MAX_VALUE 0xb
64 /************************************************/
65 /* Status bits we track to assure no duplicates,
66 * the bits here are not used by the code but
67 * for human representation. To check a bit we
68 * take and shift over by 1 minus the value (1-8).
70 /************************************************/
71 #define TCP_EI_BITS_CLIENT_FIN 0x001
72 #define TCP_EI_BITS_CLIENT_RST 0x002
73 #define TCP_EI_BITS_SERVER_FIN 0x004
74 #define TCP_EI_BITS_SERVER_RST 0x008
75 #define TCP_EI_BITS_RETRAN 0x010
76 #define TCP_EI_BITS_PROGRESS 0x020
77 #define TCP_EI_BITS_PRESIST_MAX 0x040
78 #define TCP_EI_BITS_KEEP_MAX 0x080
79 #define TCP_EI_BITS_DATA_A_CLO 0x100
80 #define TCP_EI_BITS_RST_IN_FR 0x200 /* a front state reset */
81 #define TCP_EI_BITS_2MS_TIMER 0x400 /* 2 MSL timer expired */
83 #if defined(_KERNEL) || defined(_WANT_TCPCB)
84 /* TCP segment queue entry */
86 TAILQ_ENTRY(tseg_qent) tqe_q;
87 struct mbuf *tqe_m; /* mbuf contains packet */
88 struct mbuf *tqe_last; /* last mbuf in chain */
89 tcp_seq tqe_start; /* TCP Sequence number start */
90 int tqe_len; /* TCP segment data length */
91 uint32_t tqe_flags; /* The flags from the th->th_flags */
92 uint32_t tqe_mbuf_cnt; /* Count of mbuf overhead */
94 TAILQ_HEAD(tsegqe_head, tseg_qent);
97 tcp_seq start; /* start seq no. of sack block */
98 tcp_seq end; /* end seq no. */
102 tcp_seq start; /* start seq no. of hole */
103 tcp_seq end; /* end seq no. */
104 tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
105 TAILQ_ENTRY(sackhole) scblink; /* scoreboard linkage */
109 struct sackhole *nexthole;
110 int32_t sack_bytes_rexmit;
111 tcp_seq last_sack_ack; /* Most recent/largest sacked ack */
113 int32_t delivered_data; /* Newly acked data from last SACK */
115 int32_t sacked_bytes; /* Total sacked bytes reported by the
116 * receiver via sack option
118 uint32_t recover_fs; /* Flight Size at the start of Loss recovery */
119 uint32_t prr_delivered; /* Total bytes delivered using PRR */
120 uint32_t prr_out; /* Bytes sent during IN_RECOVERY */
123 #define SEGQ_EMPTY(tp) TAILQ_EMPTY(&(tp)->t_segq)
125 STAILQ_HEAD(tcp_log_stailq, tcp_log_mem);
128 * Tcp control block, one per tcp; fields:
129 * Organized for 64 byte cacheline efficiency based
130 * on common tcp_input/tcp_output processing.
134 struct inpcb *t_inpcb; /* back pointer to internet pcb */
135 struct tcp_function_block *t_fb;/* TCP function call block */
136 void *t_fb_ptr; /* Pointer to t_fb specific data */
137 uint32_t t_maxseg:24, /* maximum segment size */
138 t_logstate:8; /* State of "black box" logging */
139 uint32_t t_port:16, /* Tunneling (over udp) port */
140 t_state:4, /* state of this connection */
142 t_delayed_ack: 7, /* Delayed ack variable */
143 t_fin_is_rst: 1, /* Are fin's treated as resets */
147 tcp_seq snd_una; /* sent but unacknowledged */
148 tcp_seq snd_max; /* highest sequence number sent;
149 * used to recognize retransmits
151 tcp_seq snd_nxt; /* send next */
152 tcp_seq snd_up; /* send urgent pointer */
153 uint32_t snd_wnd; /* send window */
154 uint32_t snd_cwnd; /* congestion-controlled window */
155 uint32_t t_peakrate_thr; /* pre-calculated peak rate threshold */
157 u_int32_t ts_offset; /* our timestamp offset */
158 u_int32_t rfbuf_ts; /* recv buffer autoscaling timestamp */
159 int rcv_numsacks; /* # distinct sack blks present */
160 u_int t_tsomax; /* TSO total burst length limit in bytes */
161 u_int t_tsomaxsegcount; /* TSO maximum segment count */
162 u_int t_tsomaxsegsize; /* TSO maximum segment size in bytes */
163 tcp_seq rcv_nxt; /* receive next */
164 tcp_seq rcv_adv; /* advertised window */
165 uint32_t rcv_wnd; /* receive window */
166 u_int t_flags2; /* More tcpcb flags storage */
167 int t_srtt; /* smoothed round-trip time */
168 int t_rttvar; /* variance in round-trip time */
169 u_int32_t ts_recent; /* timestamp echo data */
170 u_char snd_scale; /* window scaling for send window */
171 u_char rcv_scale; /* window scaling for recv window */
172 u_char snd_limited; /* segments limited transmitted */
173 u_char request_r_scale; /* pending window scaling */
174 tcp_seq last_ack_sent;
175 u_int t_rcvtime; /* inactivity time */
177 tcp_seq rcv_up; /* receive urgent pointer */
178 int t_segqlen; /* segment reassembly queue length */
179 uint32_t t_segqmbuflen; /* Count of bytes mbufs on all entries */
180 struct tsegqe_head t_segq; /* segment reassembly queue */
181 struct mbuf *t_in_pkt;
182 struct mbuf *t_tail_pkt;
183 struct tcp_timer *t_timers; /* All the TCP timers in one struct */
184 struct vnet *t_vnet; /* back pointer to parent vnet */
185 uint32_t snd_ssthresh; /* snd_cwnd size threshold for
186 * for slow start exponential to
189 tcp_seq snd_wl1; /* window update seg seq number */
191 tcp_seq snd_wl2; /* window update seg ack number */
193 tcp_seq irs; /* initial receive sequence number */
194 tcp_seq iss; /* initial send sequence number */
195 u_int t_acktime; /* RACK and BBR incoming new data was acked */
196 u_int t_sndtime; /* time last data was sent */
197 u_int ts_recent_age; /* when last updated */
198 tcp_seq snd_recover; /* for use in NewReno Fast Recovery */
199 uint16_t cl4_spare; /* Spare to adjust CL 4 */
200 char t_oobflags; /* have some */
201 char t_iobc; /* input character */
202 int t_rxtcur; /* current retransmit value (ticks) */
204 int t_rxtshift; /* log(2) of rexmt exp. backoff */
205 u_int t_rtttime; /* RTT measurement start time */
207 tcp_seq t_rtseq; /* sequence number being timed */
208 u_int t_starttime; /* time connection was established */
209 u_int t_fbyte_in; /* ticks time when first byte queued in */
210 u_int t_fbyte_out; /* ticks time when first byte queued out */
212 u_int t_pmtud_saved_maxseg; /* pre-blackhole MSS */
213 int t_blackhole_enter; /* when to enter blackhole detection */
214 int t_blackhole_exit; /* when to exit blackhole detection */
215 u_int t_rttmin; /* minimum rtt allowed */
217 u_int t_rttbest; /* best rtt we've seen */
219 int t_softerror; /* possible error not yet reported */
220 uint32_t max_sndwnd; /* largest window peer has offered */
222 uint32_t snd_cwnd_prev; /* cwnd prior to retransmit */
223 uint32_t snd_ssthresh_prev; /* ssthresh prior to retransmit */
224 tcp_seq snd_recover_prev; /* snd_recover prior to retransmit */
225 int t_sndzerowin; /* zero-window updates sent */
226 u_long t_rttupdated; /* number of times rtt sampled */
227 int snd_numholes; /* number of holes seen by sender */
228 u_int t_badrxtwin; /* window for retransmit recovery */
229 TAILQ_HEAD(sackhole_head, sackhole) snd_holes;
230 /* SACK scoreboard (sorted) */
231 tcp_seq snd_fack; /* last seq number(+1) sack'd by rcv'r*/
232 struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
233 struct sackhint sackhint; /* SACK scoreboard hint */
234 int t_rttlow; /* smallest observerved RTT */
235 int rfbuf_cnt; /* recv buffer autoscaling byte count */
236 struct toedev *tod; /* toedev handling this connection */
237 int t_sndrexmitpack; /* retransmit packets sent */
238 int t_rcvoopack; /* out-of-order packets received */
239 void *t_toe; /* TOE pcb pointer */
240 struct cc_algo *cc_algo; /* congestion control algorithm */
241 struct cc_var *ccv; /* congestion control specific vars */
242 struct osd *osd; /* storage for Khelp module data */
243 int t_bytes_acked; /* # bytes acked during current RTT */
244 u_int t_maxunacktime;
245 u_int t_keepinit; /* time to establish connection */
246 u_int t_keepidle; /* time before keepalive probes begin */
247 u_int t_keepintvl; /* interval between keepalives */
248 u_int t_keepcnt; /* number of keepalives before close */
249 int t_dupacks; /* consecutive dup acks recd */
250 int t_lognum; /* Number of log entries */
251 int t_loglimit; /* Maximum number of log entries */
252 int64_t t_pacing_rate; /* bytes / sec, -1 => unlimited */
253 struct tcp_log_stailq t_logs; /* Log buffer */
254 struct tcp_log_id_node *t_lin;
255 struct tcp_log_id_bucket *t_lib;
256 const char *t_output_caller; /* Function that called tcp_output */
257 struct statsblob *t_stats; /* Per-connection stats */
258 uint32_t t_logsn; /* Log "serial number" */
259 uint32_t gput_ts; /* Time goodput measurement started */
260 tcp_seq gput_seq; /* Outbound measurement seq */
261 tcp_seq gput_ack; /* Inbound measurement ack */
262 int32_t t_stats_gput_prev; /* XXXLAS: Prev gput measurement */
263 uint32_t t_maxpeakrate; /* max peak rate set by user, in bytes/s */
264 uint32_t t_sndtlppack; /* tail loss probe packets sent */
265 uint64_t t_sndtlpbyte; /* total tail loss probe bytes sent */
266 uint64_t t_sndbytes; /* total bytes sent */
267 uint64_t t_snd_rxt_bytes; /* total bytes retransmitted */
269 uint8_t t_tfo_client_cookie_len; /* TCP Fast Open client cookie length */
270 uint32_t t_end_info_status; /* Status flag of end info */
271 unsigned int *t_tfo_pending; /* TCP Fast Open server pending counter */
273 uint8_t client[TCP_FASTOPEN_MAX_COOKIE_LEN];
275 } t_tfo_cookie; /* TCP Fast Open cookie to send */
277 uint8_t t_end_info_bytes[TCP_END_BYTE_INFO];
281 struct mbufq t_inpkts; /* List of saved input packets. */
282 struct mbufq t_outpkts; /* List of saved output packets. */
285 #endif /* _KERNEL || _WANT_TCPCB */
289 u_char tt_ipgen[40]; /* the size must be of max ip header, now IPv6 */
293 /* Enable TCP/UDP tunneling port */
294 #define TCP_TUNNELING_PORT_MIN 0
295 #define TCP_TUNNELING_PORT_MAX 65535
296 #define TCP_TUNNELING_PORT_DEFAULT 0
298 /* Enable TCP/UDP tunneling port */
299 #define TCP_TUNNELING_OVERHEAD_MIN sizeof(struct udphdr)
300 #define TCP_TUNNELING_OVERHEAD_MAX 1024
301 #define TCP_TUNNELING_OVERHEAD_DEFAULT TCP_TUNNELING_OVERHEAD_MIN
303 /* Minimum map entries limit value, if set */
304 #define TCP_MIN_MAP_ENTRIES_LIMIT 128
307 * TODO: We yet need to brave plowing in
308 * to tcp_input() and the pru_usrreq() block.
309 * Right now these go to the old standards which
310 * are somewhat ok, but in the long term may
311 * need to be changed. If we do tackle tcp_input()
312 * then we need to get rid of the tcp_do_segment()
315 /* Flags for tcp functions */
316 #define TCP_FUNC_BEING_REMOVED 0x01 /* Can no longer be referenced */
319 * If defining the optional tcp_timers, in the
320 * tfb_tcp_timer_stop call you must use the
321 * callout_async_drain() function with the
322 * tcp_timer_discard callback. You should check
323 * the return of callout_async_drain() and if 0
324 * increment tt_draincnt. Since the timer sub-system
325 * does not know your callbacks you must provide a
326 * stop_all function that loops through and calls
327 * tcp_timer_stop() with each of your defined timers.
328 * Adding a tfb_tcp_handoff_ok function allows the socket
329 * option to change stacks to query you even if the
330 * connection is in a later stage. You return 0 to
331 * say you can take over and run your stack, you return
332 * non-zero (an error number) to say no you can't.
333 * If the function is undefined you can only change
334 * in the early states (before connect or listen).
335 * tfb_tcp_fb_fini is changed to add a flag to tell
336 * the old stack if the tcb is being destroyed or
337 * not. A one in the flag means the TCB is being
338 * destroyed, a zero indicates its transitioning to
339 * another stack (via socket option).
341 struct tcp_function_block {
342 char tfb_tcp_block_name[TCP_FUNCTION_NAME_LEN_MAX];
343 int (*tfb_tcp_output)(struct tcpcb *);
344 int (*tfb_tcp_output_wtime)(struct tcpcb *, const struct timeval *);
345 void (*tfb_tcp_do_segment)(struct mbuf *, struct tcphdr *,
346 struct socket *, struct tcpcb *,
348 int (*tfb_do_queued_segments)(struct socket *, struct tcpcb *, int);
349 int (*tfb_do_segment_nounlock)(struct mbuf *, struct tcphdr *,
350 struct socket *, struct tcpcb *,
352 int, struct timeval *);
353 void (*tfb_tcp_hpts_do_segment)(struct mbuf *, struct tcphdr *,
354 struct socket *, struct tcpcb *,
356 int, struct timeval *);
357 int (*tfb_tcp_ctloutput)(struct socket *so, struct sockopt *sopt,
358 struct inpcb *inp, struct tcpcb *tp);
359 /* Optional memory allocation/free routine */
360 int (*tfb_tcp_fb_init)(struct tcpcb *);
361 void (*tfb_tcp_fb_fini)(struct tcpcb *, int);
362 /* Optional timers, must define all if you define one */
363 int (*tfb_tcp_timer_stop_all)(struct tcpcb *);
364 void (*tfb_tcp_timer_activate)(struct tcpcb *,
366 int (*tfb_tcp_timer_active)(struct tcpcb *, uint32_t);
367 void (*tfb_tcp_timer_stop)(struct tcpcb *, uint32_t);
368 void (*tfb_tcp_rexmit_tmr)(struct tcpcb *);
369 int (*tfb_tcp_handoff_ok)(struct tcpcb *);
370 void (*tfb_tcp_mtu_chg)(struct tcpcb *);
371 int (*tfb_pru_options)(struct tcpcb *, int);
372 void (*tfb_hwtls_change)(struct tcpcb *, int);
373 volatile uint32_t tfb_refcnt;
378 struct tcp_function {
379 TAILQ_ENTRY(tcp_function) tf_next;
380 char tf_name[TCP_FUNCTION_NAME_LEN_MAX];
381 struct tcp_function_block *tf_fb;
384 TAILQ_HEAD(tcp_funchead, tcp_function);
388 * Flags and utility macros for the t_flags field.
390 #define TF_ACKNOW 0x00000001 /* ack peer immediately */
391 #define TF_DELACK 0x00000002 /* ack, but try to delay it */
392 #define TF_NODELAY 0x00000004 /* don't delay packets to coalesce */
393 #define TF_NOOPT 0x00000008 /* don't use tcp options */
394 #define TF_SENTFIN 0x00000010 /* have sent FIN */
395 #define TF_REQ_SCALE 0x00000020 /* have/will request window scaling */
396 #define TF_RCVD_SCALE 0x00000040 /* other side has requested scaling */
397 #define TF_REQ_TSTMP 0x00000080 /* have/will request timestamps */
398 #define TF_RCVD_TSTMP 0x00000100 /* a timestamp was received in SYN */
399 #define TF_SACK_PERMIT 0x00000200 /* other side said I could SACK */
400 #define TF_NEEDSYN 0x00000400 /* send SYN (implicit state) */
401 #define TF_NEEDFIN 0x00000800 /* send FIN (implicit state) */
402 #define TF_NOPUSH 0x00001000 /* don't push */
403 #define TF_PREVVALID 0x00002000 /* saved values for bad rxmit valid */
404 #define TF_WAKESOR 0x00004000 /* wake up receive socket */
405 #define TF_GPUTINPROG 0x00008000 /* Goodput measurement in progress */
406 #define TF_MORETOCOME 0x00010000 /* More data to be appended to sock */
407 #define TF_LQ_OVERFLOW 0x00020000 /* listen queue overflow */
408 #define TF_LASTIDLE 0x00040000 /* connection was previously idle */
409 #define TF_RXWIN0SENT 0x00080000 /* sent a receiver win 0 in response */
410 #define TF_FASTRECOVERY 0x00100000 /* in NewReno Fast Recovery */
411 #define TF_WASFRECOVERY 0x00200000 /* was in NewReno Fast Recovery */
412 #define TF_SIGNATURE 0x00400000 /* require MD5 digests (RFC2385) */
413 #define TF_FORCEDATA 0x00800000 /* force out a byte */
414 #define TF_TSO 0x01000000 /* TSO enabled on this connection */
415 #define TF_TOE 0x02000000 /* this connection is offloaded */
416 #define TF_UNUSED0 0x04000000 /* unused */
417 #define TF_UNUSED1 0x08000000 /* unused */
418 #define TF_LRD 0x10000000 /* Lost Retransmission Detection */
419 #define TF_CONGRECOVERY 0x20000000 /* congestion recovery mode */
420 #define TF_WASCRECOVERY 0x40000000 /* was in congestion recovery */
421 #define TF_FASTOPEN 0x80000000 /* TCP Fast Open indication */
423 #define IN_FASTRECOVERY(t_flags) (t_flags & TF_FASTRECOVERY)
424 #define ENTER_FASTRECOVERY(t_flags) t_flags |= TF_FASTRECOVERY
425 #define EXIT_FASTRECOVERY(t_flags) t_flags &= ~TF_FASTRECOVERY
427 #define IN_CONGRECOVERY(t_flags) (t_flags & TF_CONGRECOVERY)
428 #define ENTER_CONGRECOVERY(t_flags) t_flags |= TF_CONGRECOVERY
429 #define EXIT_CONGRECOVERY(t_flags) t_flags &= ~TF_CONGRECOVERY
431 #define IN_RECOVERY(t_flags) (t_flags & (TF_CONGRECOVERY | TF_FASTRECOVERY))
432 #define ENTER_RECOVERY(t_flags) t_flags |= (TF_CONGRECOVERY | TF_FASTRECOVERY)
433 #define EXIT_RECOVERY(t_flags) t_flags &= ~(TF_CONGRECOVERY | TF_FASTRECOVERY)
435 #if defined(_KERNEL) && !defined(TCP_RFC7413)
436 #define IS_FASTOPEN(t_flags) (false)
438 #define IS_FASTOPEN(t_flags) (t_flags & TF_FASTOPEN)
441 #define BYTES_THIS_ACK(tp, th) (th->th_ack - tp->snd_una)
444 * Flags for the t_oobflags field.
446 #define TCPOOB_HAVEDATA 0x01
447 #define TCPOOB_HADDATA 0x02
450 * Flags for the extended TCP flags field, t_flags2
452 #define TF2_PLPMTU_BLACKHOLE 0x00000001 /* Possible PLPMTUD Black Hole. */
453 #define TF2_PLPMTU_PMTUD 0x00000002 /* Allowed to attempt PLPMTUD. */
454 #define TF2_PLPMTU_MAXSEGSNT 0x00000004 /* Last seg sent was full seg. */
455 #define TF2_LOG_AUTO 0x00000008 /* Session is auto-logging. */
456 #define TF2_DROP_AF_DATA 0x00000010 /* Drop after all data ack'd */
457 #define TF2_ECN_PERMIT 0x00000020 /* connection ECN-ready */
458 #define TF2_ECN_SND_CWR 0x00000040 /* ECN CWR in queue */
459 #define TF2_ECN_SND_ECE 0x00000080 /* ECN ECE in queue */
460 #define TF2_ACE_PERMIT 0x00000100 /* Accurate ECN mode */
461 #define TF2_FBYTES_COMPLETE 0x00000400 /* We have first bytes in and out */
463 * Structure to hold TCP options that are only used during segment
464 * processing (in tcp_input), but not held in the tcpcb.
465 * It's basically used to reduce the number of parameters
466 * to tcp_dooptions and tcp_addoptions.
467 * The binary order of the to_flags is relevant for packing of the
468 * options in tcp_addoptions.
471 u_int32_t to_flags; /* which options are present */
472 #define TOF_MSS 0x0001 /* maximum segment size */
473 #define TOF_SCALE 0x0002 /* window scaling */
474 #define TOF_SACKPERM 0x0004 /* SACK permitted */
475 #define TOF_TS 0x0010 /* timestamp */
476 #define TOF_SIGNATURE 0x0040 /* TCP-MD5 signature option (RFC2385) */
477 #define TOF_SACK 0x0080 /* Peer sent SACK option */
478 #define TOF_FASTOPEN 0x0100 /* TCP Fast Open (TFO) cookie */
479 #define TOF_MAXOPT 0x0200
480 u_int32_t to_tsval; /* new timestamp */
481 u_int32_t to_tsecr; /* reflected timestamp */
482 u_char *to_sacks; /* pointer to the first SACK blocks */
483 u_char *to_signature; /* pointer to the TCP-MD5 signature */
484 u_int8_t *to_tfo_cookie; /* pointer to the TFO cookie */
485 u_int16_t to_mss; /* maximum segment size */
486 u_int8_t to_wscale; /* window scaling */
487 u_int8_t to_nsacks; /* number of SACK blocks */
488 u_int8_t to_tfo_len; /* TFO cookie length */
489 u_int32_t to_spare; /* UTO */
493 * Flags for tcp_dooptions.
495 #define TO_SYN 0x01 /* parse SYN-only options */
497 struct hc_metrics_lite { /* must stay in sync with hc_metrics */
498 uint32_t rmx_mtu; /* MTU for this path */
499 uint32_t rmx_ssthresh; /* outbound gateway buffer limit */
500 uint32_t rmx_rtt; /* estimated round trip time */
501 uint32_t rmx_rttvar; /* estimated rtt variance */
502 uint32_t rmx_cwnd; /* congestion window */
503 uint32_t rmx_sendpipe; /* outbound delay-bandwidth product */
504 uint32_t rmx_recvpipe; /* inbound delay-bandwidth product */
508 * Used by tcp_maxmtu() to communicate interface specific features
509 * and limits at the time of connection setup.
514 u_int tsomaxsegcount;
518 #ifndef _NETINET_IN_PCB_H_
520 #endif /* _NETINET_IN_PCB_H_ */
523 struct inpcb *tw_inpcb; /* XXX back pointer to internet pcb */
524 uint32_t t_port:16, /* UDP port number if TCPoUDP */
530 u_short last_win; /* cached window value */
531 short tw_so_options; /* copy of so_options */
532 struct ucred *tw_cred; /* user credentials */
534 u_int32_t ts_offset; /* our timestamp offset */
537 TAILQ_ENTRY(tcptw) tw_2msl;
538 void *tw_pspare; /* TCP_SIGNATURE */
539 u_int *tw_spare; /* TCP_SIGNATURE */
542 #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
543 #define intotw(ip) ((struct tcptw *)(ip)->inp_ppcb)
544 #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
547 * The smoothed round-trip time and estimated variance
548 * are stored as fixed point numbers scaled by the values below.
549 * For convenience, these scales are also used in smoothing the average
550 * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
551 * With these scales, srtt has 3 bits to the right of the binary point,
552 * and thus an "ALPHA" of 0.875. rttvar has 2 bits to the right of the
553 * binary point, and is smoothed with an ALPHA of 0.75.
555 #define TCP_RTT_SCALE 32 /* multiplier for srtt; 3 bits frac. */
556 #define TCP_RTT_SHIFT 5 /* shift for srtt; 3 bits frac. */
557 #define TCP_RTTVAR_SCALE 16 /* multiplier for rttvar; 2 bits */
558 #define TCP_RTTVAR_SHIFT 4 /* shift for rttvar; 2 bits */
559 #define TCP_DELTA_SHIFT 2 /* see tcp_input.c */
562 * The initial retransmission should happen at rtt + 4 * rttvar.
563 * Because of the way we do the smoothing, srtt and rttvar
564 * will each average +1/2 tick of bias. When we compute
565 * the retransmit timer, we want 1/2 tick of rounding and
566 * 1 extra tick because of +-1/2 tick uncertainty in the
567 * firing of the timer. The bias will give us exactly the
568 * 1.5 tick we need. But, because the bias is
569 * statistical, we have to test that we don't drop below
570 * the minimum feasible timer (which is 2 ticks).
571 * This version of the macro adapted from a paper by Lawrence
572 * Brakmo and Larry Peterson which outlines a problem caused
573 * by insufficient precision in the original implementation,
574 * which results in inappropriately large RTO values for very
577 #define TCP_REXMTVAL(tp) \
578 max((tp)->t_rttmin, (((tp)->t_srtt >> (TCP_RTT_SHIFT - TCP_DELTA_SHIFT)) \
579 + (tp)->t_rttvar) >> TCP_DELTA_SHIFT)
583 * Many of these should be kept per connection,
584 * but that's inconvenient at the moment.
587 uint64_t tcps_connattempt; /* connections initiated */
588 uint64_t tcps_accepts; /* connections accepted */
589 uint64_t tcps_connects; /* connections established */
590 uint64_t tcps_drops; /* connections dropped */
591 uint64_t tcps_conndrops; /* embryonic connections dropped */
592 uint64_t tcps_minmssdrops; /* average minmss too low drops */
593 uint64_t tcps_closed; /* conn. closed (includes drops) */
594 uint64_t tcps_segstimed; /* segs where we tried to get rtt */
595 uint64_t tcps_rttupdated; /* times we succeeded */
596 uint64_t tcps_delack; /* delayed acks sent */
597 uint64_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
598 uint64_t tcps_rexmttimeo; /* retransmit timeouts */
599 uint64_t tcps_persisttimeo; /* persist timeouts */
600 uint64_t tcps_keeptimeo; /* keepalive timeouts */
601 uint64_t tcps_keepprobe; /* keepalive probes sent */
602 uint64_t tcps_keepdrops; /* connections dropped in keepalive */
604 uint64_t tcps_sndtotal; /* total packets sent */
605 uint64_t tcps_sndpack; /* data packets sent */
606 uint64_t tcps_sndbyte; /* data bytes sent */
607 uint64_t tcps_sndrexmitpack; /* data packets retransmitted */
608 uint64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
609 uint64_t tcps_sndrexmitbad; /* unnecessary packet retransmissions */
610 uint64_t tcps_sndacks; /* ack-only packets sent */
611 uint64_t tcps_sndprobe; /* window probes sent */
612 uint64_t tcps_sndurg; /* packets sent with URG only */
613 uint64_t tcps_sndwinup; /* window update-only packets sent */
614 uint64_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
616 uint64_t tcps_rcvtotal; /* total packets received */
617 uint64_t tcps_rcvpack; /* packets received in sequence */
618 uint64_t tcps_rcvbyte; /* bytes received in sequence */
619 uint64_t tcps_rcvbadsum; /* packets received with ccksum errs */
620 uint64_t tcps_rcvbadoff; /* packets received with bad offset */
621 uint64_t tcps_rcvreassfull; /* packets dropped for no reass space */
622 uint64_t tcps_rcvshort; /* packets received too short */
623 uint64_t tcps_rcvduppack; /* duplicate-only packets received */
624 uint64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
625 uint64_t tcps_rcvpartduppack; /* packets with some duplicate data */
626 uint64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
627 uint64_t tcps_rcvoopack; /* out-of-order packets received */
628 uint64_t tcps_rcvoobyte; /* out-of-order bytes received */
629 uint64_t tcps_rcvpackafterwin; /* packets with data after window */
630 uint64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
631 uint64_t tcps_rcvafterclose; /* packets rcvd after "close" */
632 uint64_t tcps_rcvwinprobe; /* rcvd window probe packets */
633 uint64_t tcps_rcvdupack; /* rcvd duplicate acks */
634 uint64_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
635 uint64_t tcps_rcvackpack; /* rcvd ack packets */
636 uint64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
637 uint64_t tcps_rcvwinupd; /* rcvd window update packets */
638 uint64_t tcps_pawsdrop; /* segments dropped due to PAWS */
639 uint64_t tcps_predack; /* times hdr predict ok for acks */
640 uint64_t tcps_preddat; /* times hdr predict ok for data pkts */
641 uint64_t tcps_pcbcachemiss;
642 uint64_t tcps_cachedrtt; /* times cached RTT in route updated */
643 uint64_t tcps_cachedrttvar; /* times cached rttvar updated */
644 uint64_t tcps_cachedssthresh; /* times cached ssthresh updated */
645 uint64_t tcps_usedrtt; /* times RTT initialized from route */
646 uint64_t tcps_usedrttvar; /* times RTTVAR initialized from rt */
647 uint64_t tcps_usedssthresh; /* times ssthresh initialized from rt*/
648 uint64_t tcps_persistdrop; /* timeout in persist state */
649 uint64_t tcps_badsyn; /* bogus SYN, e.g. premature ACK */
650 uint64_t tcps_mturesent; /* resends due to MTU discovery */
651 uint64_t tcps_listendrop; /* listen queue overflows */
652 uint64_t tcps_badrst; /* ignored RSTs in the window */
654 uint64_t tcps_sc_added; /* entry added to syncache */
655 uint64_t tcps_sc_retransmitted; /* syncache entry was retransmitted */
656 uint64_t tcps_sc_dupsyn; /* duplicate SYN packet */
657 uint64_t tcps_sc_dropped; /* could not reply to packet */
658 uint64_t tcps_sc_completed; /* successful extraction of entry */
659 uint64_t tcps_sc_bucketoverflow;/* syncache per-bucket limit hit */
660 uint64_t tcps_sc_cacheoverflow; /* syncache cache limit hit */
661 uint64_t tcps_sc_reset; /* RST removed entry from syncache */
662 uint64_t tcps_sc_stale; /* timed out or listen socket gone */
663 uint64_t tcps_sc_aborted; /* syncache entry aborted */
664 uint64_t tcps_sc_badack; /* removed due to bad ACK */
665 uint64_t tcps_sc_unreach; /* ICMP unreachable received */
666 uint64_t tcps_sc_zonefail; /* zalloc() failed */
667 uint64_t tcps_sc_sendcookie; /* SYN cookie sent */
668 uint64_t tcps_sc_recvcookie; /* SYN cookie received */
670 uint64_t tcps_hc_added; /* entry added to hostcache */
671 uint64_t tcps_hc_bucketoverflow;/* hostcache per bucket limit hit */
673 uint64_t tcps_finwait2_drops; /* Drop FIN_WAIT_2 connection after time limit */
675 /* SACK related stats */
676 uint64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
677 uint64_t tcps_sack_rexmits; /* SACK rexmit segments */
678 uint64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
679 uint64_t tcps_sack_rcv_blocks; /* SACK blocks (options) received */
680 uint64_t tcps_sack_send_blocks; /* SACK blocks (options) sent */
681 uint64_t tcps_sack_lostrexmt; /* SACK lost retransmission recovered */
682 uint64_t tcps_sack_sboverflow; /* times scoreboard overflowed */
684 /* ECN related stats */
685 uint64_t tcps_ecn_ce; /* ECN Congestion Experienced */
686 uint64_t tcps_ecn_ect0; /* ECN Capable Transport */
687 uint64_t tcps_ecn_ect1; /* ECN Capable Transport */
688 uint64_t tcps_ecn_shs; /* ECN successful handshakes */
689 uint64_t tcps_ecn_rcwnd; /* # times ECN reduced the cwnd */
691 /* TCP_SIGNATURE related stats */
692 uint64_t tcps_sig_rcvgoodsig; /* Total matching signature received */
693 uint64_t tcps_sig_rcvbadsig; /* Total bad signature received */
694 uint64_t tcps_sig_err_buildsig; /* Failed to make signature */
695 uint64_t tcps_sig_err_sigopt; /* No signature expected by socket */
696 uint64_t tcps_sig_err_nosigopt; /* No signature provided by segment */
698 /* Path MTU Discovery Black Hole Detection related stats */
699 uint64_t tcps_pmtud_blackhole_activated; /* Black Hole Count */
700 uint64_t tcps_pmtud_blackhole_activated_min_mss; /* BH at min MSS Count */
701 uint64_t tcps_pmtud_blackhole_failed; /* Black Hole Failure Count */
703 uint64_t tcps_tunneled_pkts; /* Packets encap's in UDP received */
704 uint64_t tcps_tunneled_errs; /* Packets that had errors that were UDP encaped */
706 uint64_t _pad[9]; /* 6 UTO, 3 TBD */
709 #define tcps_rcvmemdrop tcps_rcvreassfull /* compat */
712 #define TI_UNLOCKED 1
714 #include <sys/counter.h>
716 VNET_PCPUSTAT_DECLARE(struct tcpstat, tcpstat); /* tcp statistics */
718 * In-kernel consumers can use these accessor macros directly to update
721 #define TCPSTAT_ADD(name, val) \
722 VNET_PCPUSTAT_ADD(struct tcpstat, tcpstat, name, (val))
723 #define TCPSTAT_INC(name) TCPSTAT_ADD(name, 1)
726 * Kernel module consumers must use this accessor macro.
728 void kmod_tcpstat_add(int statnum, int val);
729 #define KMOD_TCPSTAT_ADD(name, val) \
730 kmod_tcpstat_add(offsetof(struct tcpstat, name) / sizeof(uint64_t), val)
731 #define KMOD_TCPSTAT_INC(name) KMOD_TCPSTAT_ADD(name, 1)
734 * Running TCP connection count by state.
736 VNET_DECLARE(counter_u64_t, tcps_states[TCP_NSTATES]);
737 #define V_tcps_states VNET(tcps_states)
738 #define TCPSTATES_INC(state) counter_u64_add(V_tcps_states[state], 1)
739 #define TCPSTATES_DEC(state) counter_u64_add(V_tcps_states[state], -1)
742 * TCP specific helper hook point identifiers.
744 #define HHOOK_TCP_EST_IN 0
745 #define HHOOK_TCP_EST_OUT 1
746 #define HHOOK_TCP_LAST HHOOK_TCP_EST_OUT
748 struct tcp_hhook_data {
757 void hhook_run_tcp_est_out(struct tcpcb *tp,
758 struct tcphdr *th, struct tcpopt *to,
759 uint32_t len, int tso);
764 * TCB structure exported to user-land via sysctl(3).
766 * Fields prefixed with "xt_" are unique to the export structure, and fields
767 * with "t_" or other prefixes match corresponding fields of 'struct tcpcb'.
770 * (s) - used by userland utilities in src
771 * (p) - used by utilities in ports
772 * (3) - is known to be used by third party software not in ports
773 * (n) - no known usage
775 * Evil hack: declare only if in_pcb.h and sys/socketvar.h have been
776 * included. Not all of our clients do.
778 #if defined(_NETINET_IN_PCB_H_) && defined(_SYS_SOCKETVAR_H_)
780 ksize_t xt_len; /* length of this structure */
781 struct xinpcb xt_inp;
782 char xt_stack[TCP_FUNCTION_NAME_LEN_MAX]; /* (s) */
783 char xt_logid[TCP_LOG_ID_LEN]; /* (s) */
784 char xt_cc[TCP_CA_NAME_MAX]; /* (s) */
786 int32_t t_state; /* (s,p) */
787 uint32_t t_flags; /* (s,p) */
788 int32_t t_sndzerowin; /* (s) */
789 int32_t t_sndrexmitpack; /* (s) */
790 int32_t t_rcvoopack; /* (s) */
791 int32_t t_rcvtime; /* (s) */
792 int32_t tt_rexmt; /* (s) */
793 int32_t tt_persist; /* (s) */
794 int32_t tt_keep; /* (s) */
795 int32_t tt_2msl; /* (s) */
796 int32_t tt_delack; /* (s) */
797 int32_t t_logstate; /* (3) */
798 uint32_t t_snd_cwnd; /* (s) */
799 uint32_t t_snd_ssthresh; /* (s) */
800 uint32_t t_maxseg; /* (s) */
801 uint32_t t_rcv_wnd; /* (s) */
802 uint32_t t_snd_wnd; /* (s) */
803 uint32_t xt_ecn; /* (s) */
804 uint16_t xt_encaps_port; /* (s) */
810 void tcp_inptoxtp(const struct inpcb *, struct xtcpcb *);
815 * TCP function information (name-to-id mapping, aliases, and refcnt)
816 * exported to user-land via sysctl(3).
818 struct tcp_function_info {
821 char tfi_name[TCP_FUNCTION_NAME_LEN_MAX];
822 char tfi_alias[TCP_FUNCTION_NAME_LEN_MAX];
826 * Identifiers for TCP sysctl nodes
828 #define TCPCTL_DO_RFC1323 1 /* use RFC-1323 extensions */
829 #define TCPCTL_MSSDFLT 3 /* MSS default */
830 #define TCPCTL_STATS 4 /* statistics */
831 #define TCPCTL_RTTDFLT 5 /* default RTT estimate */
832 #define TCPCTL_KEEPIDLE 6 /* keepalive idle timer */
833 #define TCPCTL_KEEPINTVL 7 /* interval to send keepalives */
834 #define TCPCTL_SENDSPACE 8 /* send buffer space */
835 #define TCPCTL_RECVSPACE 9 /* receive buffer space */
836 #define TCPCTL_KEEPINIT 10 /* timeout for establishing syn */
837 #define TCPCTL_PCBLIST 11 /* list of all outstanding PCBs */
838 #define TCPCTL_DELACKTIME 12 /* time before sending delayed ACK */
839 #define TCPCTL_V6MSSDFLT 13 /* MSS default for IPv6 */
840 #define TCPCTL_SACK 14 /* Selective Acknowledgement,rfc 2018 */
841 #define TCPCTL_DROP 15 /* drop tcp connection */
842 #define TCPCTL_STATES 16 /* connection counts by TCP state */
846 SYSCTL_DECL(_net_inet_tcp);
847 SYSCTL_DECL(_net_inet_tcp_sack);
848 MALLOC_DECLARE(M_TCPLOG);
851 VNET_DECLARE(int, tcp_log_in_vain);
852 #define V_tcp_log_in_vain VNET(tcp_log_in_vain)
855 * Global TCP tunables shared between different stacks.
856 * Please keep the list sorted.
858 VNET_DECLARE(int, drop_synfin);
859 VNET_DECLARE(int, path_mtu_discovery);
860 VNET_DECLARE(int, tcp_abc_l_var);
861 VNET_DECLARE(int, tcp_autorcvbuf_max);
862 VNET_DECLARE(int, tcp_autosndbuf_inc);
863 VNET_DECLARE(int, tcp_autosndbuf_max);
864 VNET_DECLARE(int, tcp_delack_enabled);
865 VNET_DECLARE(int, tcp_do_autorcvbuf);
866 VNET_DECLARE(int, tcp_do_autosndbuf);
867 VNET_DECLARE(int, tcp_do_ecn);
868 VNET_DECLARE(int, tcp_do_lrd);
869 VNET_DECLARE(int, tcp_do_prr);
870 VNET_DECLARE(int, tcp_do_prr_conservative);
871 VNET_DECLARE(int, tcp_do_newcwv);
872 VNET_DECLARE(int, tcp_do_rfc1323);
873 VNET_DECLARE(int, tcp_tolerate_missing_ts);
874 VNET_DECLARE(int, tcp_do_rfc3042);
875 VNET_DECLARE(int, tcp_do_rfc3390);
876 VNET_DECLARE(int, tcp_do_rfc3465);
877 VNET_DECLARE(int, tcp_do_newsack);
878 VNET_DECLARE(int, tcp_do_sack);
879 VNET_DECLARE(int, tcp_do_tso);
880 VNET_DECLARE(int, tcp_ecn_maxretries);
881 VNET_DECLARE(int, tcp_initcwnd_segments);
882 VNET_DECLARE(int, tcp_insecure_rst);
883 VNET_DECLARE(int, tcp_insecure_syn);
884 VNET_DECLARE(uint32_t, tcp_map_entries_limit);
885 VNET_DECLARE(uint32_t, tcp_map_split_limit);
886 VNET_DECLARE(int, tcp_minmss);
887 VNET_DECLARE(int, tcp_mssdflt);
889 VNET_DECLARE(int, tcp_perconn_stats_dflt_tpl);
890 VNET_DECLARE(int, tcp_perconn_stats_enable);
892 VNET_DECLARE(int, tcp_recvspace);
893 VNET_DECLARE(int, tcp_sack_globalholes);
894 VNET_DECLARE(int, tcp_sack_globalmaxholes);
895 VNET_DECLARE(int, tcp_sack_maxholes);
896 VNET_DECLARE(int, tcp_sc_rst_sock_fail);
897 VNET_DECLARE(int, tcp_sendspace);
898 VNET_DECLARE(int, tcp_udp_tunneling_overhead);
899 VNET_DECLARE(int, tcp_udp_tunneling_port);
900 VNET_DECLARE(struct inpcbhead, tcb);
901 VNET_DECLARE(struct inpcbinfo, tcbinfo);
903 #define V_tcp_do_lrd VNET(tcp_do_lrd)
904 #define V_tcp_do_prr VNET(tcp_do_prr)
905 #define V_tcp_do_prr_conservative VNET(tcp_do_prr_conservative)
906 #define V_tcp_do_newcwv VNET(tcp_do_newcwv)
907 #define V_drop_synfin VNET(drop_synfin)
908 #define V_path_mtu_discovery VNET(path_mtu_discovery)
909 #define V_tcb VNET(tcb)
910 #define V_tcbinfo VNET(tcbinfo)
911 #define V_tcp_abc_l_var VNET(tcp_abc_l_var)
912 #define V_tcp_autorcvbuf_max VNET(tcp_autorcvbuf_max)
913 #define V_tcp_autosndbuf_inc VNET(tcp_autosndbuf_inc)
914 #define V_tcp_autosndbuf_max VNET(tcp_autosndbuf_max)
915 #define V_tcp_delack_enabled VNET(tcp_delack_enabled)
916 #define V_tcp_do_autorcvbuf VNET(tcp_do_autorcvbuf)
917 #define V_tcp_do_autosndbuf VNET(tcp_do_autosndbuf)
918 #define V_tcp_do_ecn VNET(tcp_do_ecn)
919 #define V_tcp_do_rfc1323 VNET(tcp_do_rfc1323)
920 #define V_tcp_tolerate_missing_ts VNET(tcp_tolerate_missing_ts)
921 #define V_tcp_ts_offset_per_conn VNET(tcp_ts_offset_per_conn)
922 #define V_tcp_do_rfc3042 VNET(tcp_do_rfc3042)
923 #define V_tcp_do_rfc3390 VNET(tcp_do_rfc3390)
924 #define V_tcp_do_rfc3465 VNET(tcp_do_rfc3465)
925 #define V_tcp_do_newsack VNET(tcp_do_newsack)
926 #define V_tcp_do_sack VNET(tcp_do_sack)
927 #define V_tcp_do_tso VNET(tcp_do_tso)
928 #define V_tcp_ecn_maxretries VNET(tcp_ecn_maxretries)
929 #define V_tcp_initcwnd_segments VNET(tcp_initcwnd_segments)
930 #define V_tcp_insecure_rst VNET(tcp_insecure_rst)
931 #define V_tcp_insecure_syn VNET(tcp_insecure_syn)
932 #define V_tcp_map_entries_limit VNET(tcp_map_entries_limit)
933 #define V_tcp_map_split_limit VNET(tcp_map_split_limit)
934 #define V_tcp_minmss VNET(tcp_minmss)
935 #define V_tcp_mssdflt VNET(tcp_mssdflt)
937 #define V_tcp_perconn_stats_dflt_tpl VNET(tcp_perconn_stats_dflt_tpl)
938 #define V_tcp_perconn_stats_enable VNET(tcp_perconn_stats_enable)
940 #define V_tcp_recvspace VNET(tcp_recvspace)
941 #define V_tcp_sack_globalholes VNET(tcp_sack_globalholes)
942 #define V_tcp_sack_globalmaxholes VNET(tcp_sack_globalmaxholes)
943 #define V_tcp_sack_maxholes VNET(tcp_sack_maxholes)
944 #define V_tcp_sc_rst_sock_fail VNET(tcp_sc_rst_sock_fail)
945 #define V_tcp_sendspace VNET(tcp_sendspace)
946 #define V_tcp_udp_tunneling_overhead VNET(tcp_udp_tunneling_overhead)
947 #define V_tcp_udp_tunneling_port VNET(tcp_udp_tunneling_port)
950 VNET_DECLARE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST + 1]);
951 #define V_tcp_hhh VNET(tcp_hhh)
954 int tcp_addoptions(struct tcpopt *, u_char *);
955 int tcp_ccalgounload(struct cc_algo *unload_algo);
957 tcp_close(struct tcpcb *);
958 void tcp_discardcb(struct tcpcb *);
959 void tcp_twstart(struct tcpcb *);
960 void tcp_twclose(struct tcptw *, int);
961 void tcp_ctlinput(int, struct sockaddr *, void *);
962 int tcp_ctloutput(struct socket *, struct sockopt *);
963 void tcp_ctlinput_viaudp(int, struct sockaddr *, void *, void *);
965 tcp_drop(struct tcpcb *, int);
966 void tcp_drain(void);
968 void tcp_fini(void *);
969 char *tcp_log_addrs(struct in_conninfo *, struct tcphdr *, void *,
971 char *tcp_log_vain(struct in_conninfo *, struct tcphdr *, void *,
973 int tcp_reass(struct tcpcb *, struct tcphdr *, tcp_seq *, int *,
975 void tcp_reass_global_init(void);
976 void tcp_reass_flush(struct tcpcb *);
977 void tcp_dooptions(struct tcpopt *, u_char *, int, int);
978 void tcp_dropwithreset(struct mbuf *, struct tcphdr *,
979 struct tcpcb *, int, int);
980 void tcp_pulloutofband(struct socket *,
981 struct tcphdr *, struct mbuf *, int);
982 void tcp_xmit_timer(struct tcpcb *, int);
983 void tcp_newreno_partial_ack(struct tcpcb *, struct tcphdr *);
984 void cc_ack_received(struct tcpcb *tp, struct tcphdr *th,
985 uint16_t nsegs, uint16_t type);
986 void cc_conn_init(struct tcpcb *tp);
987 void cc_post_recovery(struct tcpcb *tp, struct tcphdr *th);
988 void cc_ecnpkt_handler(struct tcpcb *tp, struct tcphdr *th, uint8_t iptos);
989 void cc_ecnpkt_handler_flags(struct tcpcb *tp, uint16_t flags, uint8_t iptos);
990 void cc_cong_signal(struct tcpcb *tp, struct tcphdr *th, uint32_t type);
992 void hhook_run_tcp_est_in(struct tcpcb *tp,
993 struct tcphdr *th, struct tcpopt *to);
996 int tcp_input(struct mbuf **, int *, int);
997 int tcp_autorcvbuf(struct mbuf *, struct tcphdr *, struct socket *,
998 struct tcpcb *, int);
999 int tcp_input_with_port(struct mbuf **, int *, int, uint16_t);
1000 void tcp_handle_wakeup(struct tcpcb *, struct socket *);
1001 void tcp_do_segment(struct mbuf *, struct tcphdr *,
1002 struct socket *, struct tcpcb *, int, int, uint8_t);
1004 int register_tcp_functions(struct tcp_function_block *blk, int wait);
1005 int register_tcp_functions_as_names(struct tcp_function_block *blk,
1006 int wait, const char *names[], int *num_names);
1007 int register_tcp_functions_as_name(struct tcp_function_block *blk,
1008 const char *name, int wait);
1009 int deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce,
1011 struct tcp_function_block *find_and_ref_tcp_functions(struct tcp_function_set *fs);
1012 void tcp_switch_back_to_default(struct tcpcb *tp);
1013 struct tcp_function_block *
1014 find_and_ref_tcp_fb(struct tcp_function_block *fs);
1015 int tcp_default_ctloutput(struct socket *so, struct sockopt *sopt, struct inpcb *inp, struct tcpcb *tp);
1017 extern counter_u64_t tcp_inp_lro_direct_queue;
1018 extern counter_u64_t tcp_inp_lro_wokeup_queue;
1019 extern counter_u64_t tcp_inp_lro_compressed;
1020 extern counter_u64_t tcp_inp_lro_locks_taken;
1021 extern counter_u64_t tcp_extra_mbuf;
1022 extern counter_u64_t tcp_would_have_but;
1023 extern counter_u64_t tcp_comp_total;
1024 extern counter_u64_t tcp_uncomp_total;
1025 extern counter_u64_t tcp_bad_csums;
1027 #ifdef NETFLIX_EXP_DETECTION
1028 /* Various SACK attack thresholds */
1029 extern int32_t tcp_force_detection;
1030 extern int32_t tcp_sack_to_ack_thresh;
1031 extern int32_t tcp_sack_to_move_thresh;
1032 extern int32_t tcp_restoral_thresh;
1033 extern int32_t tcp_sad_decay_val;
1034 extern int32_t tcp_sad_pacing_interval;
1035 extern int32_t tcp_sad_low_pps;
1036 extern int32_t tcp_map_minimum;
1037 extern int32_t tcp_attack_on_turns_on_logging;
1039 extern uint32_t tcp_ack_war_time_window;
1040 extern uint32_t tcp_ack_war_cnt;
1042 uint32_t tcp_maxmtu(struct in_conninfo *, struct tcp_ifcap *);
1043 uint32_t tcp_maxmtu6(struct in_conninfo *, struct tcp_ifcap *);
1044 u_int tcp_maxseg(const struct tcpcb *);
1045 u_int tcp_fixed_maxseg(const struct tcpcb *);
1046 void tcp_mss_update(struct tcpcb *, int, int, struct hc_metrics_lite *,
1047 struct tcp_ifcap *);
1048 void tcp_mss(struct tcpcb *, int);
1049 int tcp_mssopt(struct in_conninfo *);
1051 tcp_drop_syn_sent(struct inpcb *, int);
1053 tcp_newtcpcb(struct inpcb *);
1054 int tcp_output(struct tcpcb *);
1055 void tcp_state_change(struct tcpcb *, int);
1056 void tcp_respond(struct tcpcb *, void *,
1057 struct tcphdr *, struct mbuf *, tcp_seq, tcp_seq, int);
1058 void tcp_tw_init(void);
1060 void tcp_tw_destroy(void);
1062 void tcp_tw_zone_change(void);
1063 int tcp_twcheck(struct inpcb *, struct tcpopt *, struct tcphdr *,
1064 struct mbuf *, int);
1065 void tcp_setpersist(struct tcpcb *);
1066 void tcp_slowtimo(void);
1068 tcpip_maketemplate(struct inpcb *);
1069 void tcpip_fillheaders(struct inpcb *, uint16_t, void *, void *);
1070 void tcp_timer_activate(struct tcpcb *, uint32_t, u_int);
1071 int tcp_timer_suspend(struct tcpcb *, uint32_t);
1072 void tcp_timers_unsuspend(struct tcpcb *, uint32_t);
1073 int tcp_timer_active(struct tcpcb *, uint32_t);
1074 void tcp_timer_stop(struct tcpcb *, uint32_t);
1075 void tcp_trace(short, short, struct tcpcb *, void *, struct tcphdr *, int);
1076 int inp_to_cpuid(struct inpcb *inp);
1078 * All tcp_hc_* functions are IPv4 and IPv6 (via in_conninfo)
1080 void tcp_hc_init(void);
1082 void tcp_hc_destroy(void);
1084 void tcp_hc_get(struct in_conninfo *, struct hc_metrics_lite *);
1085 uint32_t tcp_hc_getmtu(struct in_conninfo *);
1086 void tcp_hc_updatemtu(struct in_conninfo *, uint32_t);
1087 void tcp_hc_update(struct in_conninfo *, struct hc_metrics_lite *);
1089 extern struct pr_usrreqs tcp_usrreqs;
1091 uint32_t tcp_new_ts_offset(struct in_conninfo *);
1092 tcp_seq tcp_new_isn(struct in_conninfo *);
1094 int tcp_sack_doack(struct tcpcb *, struct tcpopt *, tcp_seq);
1095 int tcp_dsack_block_exists(struct tcpcb *);
1096 void tcp_update_dsack_list(struct tcpcb *, tcp_seq, tcp_seq);
1097 void tcp_update_sack_list(struct tcpcb *tp, tcp_seq rcv_laststart, tcp_seq rcv_lastend);
1098 void tcp_clean_dsack_blocks(struct tcpcb *tp);
1099 void tcp_clean_sackreport(struct tcpcb *tp);
1100 void tcp_sack_adjust(struct tcpcb *tp);
1101 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
1102 void tcp_do_prr_ack(struct tcpcb *, struct tcphdr *, struct tcpopt *);
1103 void tcp_lost_retransmission(struct tcpcb *, struct tcphdr *);
1104 void tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
1105 void tcp_free_sackholes(struct tcpcb *tp);
1106 void tcp_sack_lost_retransmission(struct tcpcb *, struct tcphdr *);
1107 int tcp_newreno(struct tcpcb *, struct tcphdr *);
1108 int tcp_compute_pipe(struct tcpcb *);
1109 uint32_t tcp_compute_initwnd(uint32_t);
1110 void tcp_sndbuf_autoscale(struct tcpcb *, struct socket *, uint32_t);
1111 int tcp_stats_sample_rollthedice(struct tcpcb *tp, void *seed_bytes,
1113 int tcp_can_enable_pacing(void);
1114 void tcp_decrement_paced_conn(void);
1117 tcp_m_copym(struct mbuf *m, int32_t off0, int32_t *plen,
1118 int32_t seglimit, int32_t segsize, struct sockbuf *sb, bool hw_tls);
1120 int tcp_stats_init(void);
1121 void tcp_log_end_status(struct tcpcb *tp, uint8_t status);
1124 tcp_fields_to_host(struct tcphdr *th)
1127 th->th_seq = ntohl(th->th_seq);
1128 th->th_ack = ntohl(th->th_ack);
1129 th->th_win = ntohs(th->th_win);
1130 th->th_urp = ntohs(th->th_urp);
1134 tcp_fields_to_net(struct tcphdr *th)
1137 th->th_seq = htonl(th->th_seq);
1138 th->th_ack = htonl(th->th_ack);
1139 th->th_win = htons(th->th_win);
1140 th->th_urp = htons(th->th_urp);
1144 tcp_account_for_send(struct tcpcb *tp, uint32_t len, uint8_t is_rxt,
1145 uint8_t is_tlp, int hw_tls)
1147 uint64_t rexmit_percent;
1151 tp->t_sndtlpbyte += len;
1153 /* To get total bytes sent you must add t_snd_rxt_bytes to t_sndbytes */
1155 tp->t_snd_rxt_bytes += len;
1157 tp->t_sndbytes += len;
1159 if (hw_tls && is_rxt) {
1160 rexmit_percent = (1000ULL * tp->t_snd_rxt_bytes) / (10ULL * (tp->t_snd_rxt_bytes + tp->t_sndbytes));
1161 if (rexmit_percent > ktls_ifnet_max_rexmit_pct)
1162 ktls_disable_ifnet(tp);
1166 #endif /* _KERNEL */
1168 #endif /* _NETINET_TCP_VAR_H_ */