Line data Source code
1 : /* $OpenBSD: tcp_var.h,v 1.133 2018/06/11 07:40:26 bluhm Exp $ */
2 : /* $NetBSD: tcp_var.h,v 1.17 1996/02/13 23:44:24 christos Exp $ */
3 :
4 : /*
5 : * Copyright (c) 1982, 1986, 1993, 1994
6 : * The Regents of the University of California. All rights reserved.
7 : *
8 : * Redistribution and use in source and binary forms, with or without
9 : * modification, are permitted provided that the following conditions
10 : * are met:
11 : * 1. Redistributions of source code must retain the above copyright
12 : * notice, this list of conditions and the following disclaimer.
13 : * 2. Redistributions in binary form must reproduce the above copyright
14 : * notice, this list of conditions and the following disclaimer in the
15 : * documentation and/or other materials provided with the distribution.
16 : * 3. Neither the name of the University nor the names of its contributors
17 : * may be used to endorse or promote products derived from this software
18 : * without specific prior written permission.
19 : *
20 : * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 : * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 : * SUCH DAMAGE.
31 : *
32 : * @(#)tcp_var.h 8.3 (Berkeley) 4/10/94
33 : */
34 :
35 : #ifndef _NETINET_TCP_VAR_H_
36 : #define _NETINET_TCP_VAR_H_
37 :
38 : #include <sys/timeout.h>
39 :
40 : /*
41 : * Kernel variables for tcp.
42 : */
43 :
44 : struct sackblk {
45 : tcp_seq start; /* start seq no. of sack block */
46 : tcp_seq end; /* end seq no. */
47 : };
48 :
49 : struct sackhole {
50 : tcp_seq start; /* start seq no. of hole */
51 : tcp_seq end; /* end seq no. */
52 : int dups; /* number of dup(s)acks for this hole */
53 : tcp_seq rxmit; /* next seq. no in hole to be retransmitted */
54 : struct sackhole *next; /* next in list */
55 : };
56 :
57 : /*
58 : * TCP sequence queue structures.
59 : */
60 : TAILQ_HEAD(tcpqehead, tcpqent);
61 : struct tcpqent {
62 : TAILQ_ENTRY(tcpqent) tcpqe_q;
63 : struct tcphdr *tcpqe_tcp;
64 : struct mbuf *tcpqe_m; /* mbuf contains packet */
65 : };
66 :
67 : /*
68 : * Tcp control block, one per tcp; fields:
69 : */
70 : struct tcpcb {
71 : struct tcpqehead t_segq; /* sequencing queue */
72 : struct timeout t_timer[TCPT_NTIMERS]; /* tcp timers */
73 : short t_state; /* state of this connection */
74 : short t_rxtshift; /* log(2) of rexmt exp. backoff */
75 : short t_rxtcur; /* current retransmit value */
76 : short t_dupacks; /* consecutive dup acks recd */
77 : u_short t_maxseg; /* maximum segment size */
78 : char t_force; /* 1 if forcing out a byte */
79 : u_int t_flags;
80 : #define TF_ACKNOW 0x0001 /* ack peer immediately */
81 : #define TF_NODELAY 0x0004 /* don't delay packets to coalesce */
82 : #define TF_NOOPT 0x0008 /* don't use tcp options */
83 : #define TF_SENTFIN 0x0010 /* have sent FIN */
84 : #define TF_REQ_SCALE 0x0020 /* have/will request window scaling */
85 : #define TF_RCVD_SCALE 0x0040 /* other side has requested scaling */
86 : #define TF_REQ_TSTMP 0x0080 /* have/will request timestamps */
87 : #define TF_RCVD_TSTMP 0x0100 /* a timestamp was received in SYN */
88 : #define TF_SACK_PERMIT 0x0200 /* other side said I could SACK */
89 : #define TF_SIGNATURE 0x0400 /* require TCP MD5 signature */
90 : #ifdef TCP_ECN
91 : #define TF_ECN_PERMIT 0x00008000 /* other side said I could ECN */
92 : #define TF_RCVD_CE 0x00010000 /* send ECE in subsequent segs */
93 : #define TF_SEND_CWR 0x00020000 /* send CWR in next seg */
94 : #define TF_DISABLE_ECN 0x00040000 /* disable ECN for this connection */
95 : #endif
96 : #define TF_LASTIDLE 0x00100000 /* no outstanding ACK on last send */
97 : #define TF_PMTUD_PEND 0x00400000 /* Path MTU Discovery pending */
98 : #define TF_NEEDOUTPUT 0x00800000 /* call tcp_output after tcp_input */
99 : #define TF_BLOCKOUTPUT 0x01000000 /* avert tcp_output during tcp_input */
100 : #define TF_NOPUSH 0x02000000 /* don't push */
101 : #define TF_TMR_REXMT 0x04000000 /* retransmit timer armed */
102 : #define TF_TMR_PERSIST 0x08000000 /* retransmit persistence timer armed */
103 : #define TF_TMR_KEEP 0x10000000 /* keep alive timer armed */
104 : #define TF_TMR_2MSL 0x20000000 /* 2*msl quiet time timer armed */
105 : #define TF_TMR_REAPER 0x40000000 /* delayed cleanup timer armed, dead */
106 : #define TF_TMR_DELACK 0x80000000 /* delayed ack timer armed */
107 : #define TF_TIMER TF_TMR_REXMT /* used to shift with TCPT values */
108 :
109 : struct mbuf *t_template; /* skeletal packet for transmit */
110 : struct inpcb *t_inpcb; /* back pointer to internet pcb */
111 : /*
112 : * The following fields are used as in the protocol specification.
113 : * See RFC793, Dec. 1981, page 21.
114 : */
115 : /* send sequence variables */
116 : tcp_seq snd_una; /* send unacknowledged */
117 : tcp_seq snd_nxt; /* send next */
118 : tcp_seq snd_up; /* send urgent pointer */
119 : tcp_seq snd_wl1; /* window update seg seq number */
120 : tcp_seq snd_wl2; /* window update seg ack number */
121 : tcp_seq iss; /* initial send sequence number */
122 : u_long snd_wnd; /* send window */
123 : int sack_enable; /* enable SACK for this connection */
124 : int snd_numholes; /* number of holes seen by sender */
125 : struct sackhole *snd_holes; /* linked list of holes (sorted) */
126 : tcp_seq snd_last; /* for use in fast recovery */
127 : /* receive sequence variables */
128 : u_long rcv_wnd; /* receive window */
129 : tcp_seq rcv_nxt; /* receive next */
130 : tcp_seq rcv_up; /* receive urgent pointer */
131 : tcp_seq irs; /* initial receive sequence number */
132 : tcp_seq rcv_lastsack; /* last seq number(+1) sack'd by rcv'r*/
133 : int rcv_numsacks; /* # distinct sack blks present */
134 : struct sackblk sackblks[MAX_SACK_BLKS]; /* seq nos. of sack blocks */
135 :
136 : /*
137 : * Additional variables for this implementation.
138 : */
139 : /* receive variables */
140 : tcp_seq rcv_adv; /* advertised window */
141 : /* retransmit variables */
142 : tcp_seq snd_max; /* highest sequence number sent;
143 : * used to recognize retransmits
144 : */
145 : /* congestion control (for slow start, source quench, retransmit after loss) */
146 : u_long snd_cwnd; /* congestion-controlled window */
147 : u_long snd_ssthresh; /* snd_cwnd size threshold for
148 : * for slow start exponential to
149 : * linear switch
150 : */
151 :
152 : /* auto-sizing variables */
153 : u_int rfbuf_cnt; /* recv buffer autoscaling byte count */
154 : u_int32_t rfbuf_ts; /* recv buffer autoscaling time stamp */
155 :
156 : u_short t_maxopd; /* mss plus options */
157 : u_short t_peermss; /* peer's maximum segment size */
158 :
159 : /*
160 : * transmit timing stuff. See below for scale of srtt and rttvar.
161 : * "Variance" is actually smoothed difference.
162 : */
163 : uint32_t t_rcvtime; /* time last segment received */
164 : uint32_t t_rtttime; /* time we started measuring rtt */
165 : tcp_seq t_rtseq; /* sequence number being timed */
166 : short t_srtt; /* smoothed round-trip time */
167 : short t_rttvar; /* variance in round-trip time */
168 : u_short t_rttmin; /* minimum rtt allowed */
169 : u_long max_sndwnd; /* largest window peer has offered */
170 :
171 : /* out-of-band data */
172 : char t_oobflags; /* have some */
173 : char t_iobc; /* input character */
174 : #define TCPOOB_HAVEDATA 0x01
175 : #define TCPOOB_HADDATA 0x02
176 : short t_softerror; /* possible error not yet reported */
177 :
178 : /* RFC 1323 variables */
179 : u_char snd_scale; /* window scaling for send window */
180 : u_char rcv_scale; /* window scaling for recv window */
181 : u_char request_r_scale; /* pending window scaling */
182 : u_char requested_s_scale;
183 : u_int32_t ts_recent; /* timestamp echo data */
184 : u_int32_t ts_modulate; /* modulation on timestamp */
185 : u_int32_t ts_recent_age; /* when last updated */
186 : tcp_seq last_ack_sent;
187 :
188 : /* pointer for syn cache entries*/
189 : LIST_HEAD(, syn_cache) t_sc; /* list of entries by this tcb */
190 :
191 : /* Path-MTU Discovery Information */
192 : u_int t_pmtud_mss_acked; /* MSS acked, lower bound for MTU */
193 : u_int t_pmtud_mtu_sent; /* MTU used, upper bound for MTU */
194 : tcp_seq t_pmtud_th_seq; /* TCP SEQ from ICMP payload */
195 : u_int t_pmtud_nextmtu; /* Advertised Next-Hop MTU from ICMP */
196 : u_short t_pmtud_ip_len; /* IP length from ICMP payload */
197 : u_short t_pmtud_ip_hl; /* IP header length from ICMP payload */
198 :
199 : int pf;
200 : };
201 :
202 : #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb)
203 : #define sototcpcb(so) (intotcpcb(sotoinpcb(so)))
204 :
205 : #ifdef _KERNEL
206 : /*
207 : * Handy way of passing around TCP option info.
208 : */
209 : struct tcp_opt_info {
210 : int ts_present;
211 : u_int32_t ts_val;
212 : u_int32_t ts_ecr;
213 : u_int16_t maxseg;
214 : };
215 :
216 : /*
217 : * Data for the TCP compressed state engine.
218 : */
219 :
220 : #define TCP_SYN_HASH_SIZE 293
221 : #define TCP_SYN_BUCKET_SIZE 35
222 :
223 : union syn_cache_sa {
224 : struct sockaddr sa;
225 : struct sockaddr_in sin;
226 : struct sockaddr_in6 sin6;
227 : };
228 :
229 : struct syn_cache {
230 : TAILQ_ENTRY(syn_cache) sc_bucketq; /* link on bucket list */
231 : struct timeout sc_timer; /* rexmt timer */
232 : union { /* cached route */
233 : struct route route4;
234 : #ifdef INET6
235 : struct route_in6 route6;
236 : #endif
237 : } sc_route_u;
238 : #define sc_route4 sc_route_u.route4
239 : #ifdef INET6
240 : #define sc_route6 sc_route_u.route6
241 : #endif
242 : long sc_win; /* advertised window */
243 : struct syn_cache_head *sc_buckethead; /* our bucket index */
244 : struct syn_cache_set *sc_set; /* our syn cache set */
245 : u_int32_t sc_hash;
246 : u_int32_t sc_timestamp; /* timestamp from SYN */
247 : u_int32_t sc_modulate; /* our timestamp modulator */
248 : #if 0
249 : u_int32_t sc_timebase; /* our local timebase */
250 : #endif
251 : union syn_cache_sa sc_src;
252 : union syn_cache_sa sc_dst;
253 : tcp_seq sc_irs;
254 : tcp_seq sc_iss;
255 : u_int sc_rtableid;
256 : u_int sc_rxtcur; /* current rxt timeout */
257 : u_int sc_rxttot; /* total time spend on queues */
258 : u_short sc_rxtshift; /* for computing backoff */
259 : u_short sc_flags;
260 :
261 : #define SCF_UNREACH 0x0001 /* we've had an unreach error */
262 : #define SCF_TIMESTAMP 0x0002 /* peer will do timestamps */
263 : #define SCF_DEAD 0x0004 /* this entry to be released */
264 : #define SCF_SACK_PERMIT 0x0008 /* permit sack */
265 : #define SCF_ECN_PERMIT 0x0010 /* permit ecn */
266 : #define SCF_SIGNATURE 0x0020 /* enforce tcp signatures */
267 :
268 : struct mbuf *sc_ipopts; /* IP options */
269 : u_int16_t sc_peermaxseg;
270 : u_int16_t sc_ourmaxseg;
271 : u_int sc_request_r_scale : 4,
272 : sc_requested_s_scale : 4;
273 :
274 : struct tcpcb *sc_tp; /* tcb for listening socket */
275 : LIST_ENTRY(syn_cache) sc_tpq; /* list of entries by same tp */
276 : };
277 :
278 : struct syn_cache_head {
279 : TAILQ_HEAD(, syn_cache) sch_bucket; /* bucket entries */
280 : u_short sch_length; /* # entries in bucket */
281 : };
282 :
283 : struct syn_cache_set {
284 : struct syn_cache_head *scs_buckethead;
285 : int scs_size;
286 : int scs_count;
287 : int scs_use;
288 : u_int32_t scs_random[5];
289 : };
290 :
291 : #endif /* _KERNEL */
292 :
293 : /*
294 : * The smoothed round-trip time and estimated variance
295 : * are stored as fixed point numbers scaled by the values below.
296 : * For convenience, these scales are also used in smoothing the average
297 : * (smoothed = (1/scale)sample + ((scale-1)/scale)smoothed).
298 : * With these scales, srtt has 5 bits to the right of the binary point,
299 : * and thus an "ALPHA" of 0.875. rttvar has 4 bits to the right of the
300 : * binary point, and is smoothed with an ALPHA of 0.75.
301 : */
302 : #define TCP_RTT_SHIFT 3 /* shift for srtt; 5 bits frac. */
303 : #define TCP_RTTVAR_SHIFT 2 /* shift for rttvar; 4 bits */
304 : #define TCP_RTT_BASE_SHIFT 2 /* remaining 2 bit shift */
305 : #define TCP_RTT_MAX (1<<9) /* maximum rtt */
306 :
307 : /*
308 : * The initial retransmission should happen at rtt + 4 * rttvar.
309 : * Because of the way we do the smoothing, srtt and rttvar
310 : * will each average +1/2 tick of bias. When we compute
311 : * the retransmit timer, we want 1/2 tick of rounding and
312 : * 1 extra tick because of +-1/2 tick uncertainty in the
313 : * firing of the timer. The bias will give us exactly the
314 : * 1.5 tick we need. But, because the bias is
315 : * statistical, we have to test that we don't drop below
316 : * the minimum feasible timer (which is 2 ticks).
317 : * This macro assumes that the value of (1 << TCP_RTTVAR_SHIFT)
318 : * is the same as the multiplier for rttvar.
319 : */
320 : #define TCP_REXMTVAL(tp) \
321 : ((((tp)->t_srtt >> TCP_RTT_SHIFT) + (tp)->t_rttvar) >> TCP_RTT_BASE_SHIFT)
322 :
323 : /*
324 : * TCP statistics.
325 : * Many of these should be kept per connection,
326 : * but that's inconvenient at the moment.
327 : */
328 : struct tcpstat {
329 : u_int32_t tcps_connattempt; /* connections initiated */
330 : u_int32_t tcps_accepts; /* connections accepted */
331 : u_int32_t tcps_connects; /* connections established */
332 : u_int32_t tcps_drops; /* connections dropped */
333 : u_int32_t tcps_conndrops; /* embryonic connections dropped */
334 : u_int32_t tcps_closed; /* conn. closed (includes drops) */
335 : u_int32_t tcps_segstimed; /* segs where we tried to get rtt */
336 : u_int32_t tcps_rttupdated; /* times we succeeded */
337 : u_int32_t tcps_delack; /* delayed acks sent */
338 : u_int32_t tcps_timeoutdrop; /* conn. dropped in rxmt timeout */
339 : u_int32_t tcps_rexmttimeo; /* retransmit timeouts */
340 : u_int32_t tcps_persisttimeo; /* persist timeouts */
341 : u_int32_t tcps_persistdrop; /* connections dropped in persist */
342 : u_int32_t tcps_keeptimeo; /* keepalive timeouts */
343 : u_int32_t tcps_keepprobe; /* keepalive probes sent */
344 : u_int32_t tcps_keepdrops; /* connections dropped in keepalive */
345 :
346 : u_int32_t tcps_sndtotal; /* total packets sent */
347 : u_int32_t tcps_sndpack; /* data packets sent */
348 : u_int64_t tcps_sndbyte; /* data bytes sent */
349 : u_int32_t tcps_sndrexmitpack; /* data packets retransmitted */
350 : u_int64_t tcps_sndrexmitbyte; /* data bytes retransmitted */
351 : u_int64_t tcps_sndrexmitfast; /* Fast retransmits */
352 : u_int32_t tcps_sndacks; /* ack-only packets sent */
353 : u_int32_t tcps_sndprobe; /* window probes sent */
354 : u_int32_t tcps_sndurg; /* packets sent with URG only */
355 : u_int32_t tcps_sndwinup; /* window update-only packets sent */
356 : u_int32_t tcps_sndctrl; /* control (SYN|FIN|RST) packets sent */
357 :
358 : u_int32_t tcps_rcvtotal; /* total packets received */
359 : u_int32_t tcps_rcvpack; /* packets received in sequence */
360 : u_int64_t tcps_rcvbyte; /* bytes received in sequence */
361 : u_int32_t tcps_rcvbadsum; /* packets received with ccksum errs */
362 : u_int32_t tcps_rcvbadoff; /* packets received with bad offset */
363 : u_int32_t tcps_rcvmemdrop; /* packets dropped for lack of memory */
364 : u_int32_t tcps_rcvnosec; /* packets dropped for lack of ipsec */
365 : u_int32_t tcps_rcvshort; /* packets received too short */
366 : u_int32_t tcps_rcvduppack; /* duplicate-only packets received */
367 : u_int64_t tcps_rcvdupbyte; /* duplicate-only bytes received */
368 : u_int32_t tcps_rcvpartduppack; /* packets with some duplicate data */
369 : u_int64_t tcps_rcvpartdupbyte; /* dup. bytes in part-dup. packets */
370 : u_int32_t tcps_rcvoopack; /* out-of-order packets received */
371 : u_int64_t tcps_rcvoobyte; /* out-of-order bytes received */
372 : u_int32_t tcps_rcvpackafterwin; /* packets with data after window */
373 : u_int64_t tcps_rcvbyteafterwin; /* bytes rcvd after window */
374 : u_int32_t tcps_rcvafterclose; /* packets rcvd after "close" */
375 : u_int32_t tcps_rcvwinprobe; /* rcvd window probe packets */
376 : u_int32_t tcps_rcvdupack; /* rcvd duplicate acks */
377 : u_int32_t tcps_rcvacktoomuch; /* rcvd acks for unsent data */
378 : u_int32_t tcps_rcvacktooold; /* rcvd acks for old data */
379 : u_int32_t tcps_rcvackpack; /* rcvd ack packets */
380 : u_int64_t tcps_rcvackbyte; /* bytes acked by rcvd acks */
381 : u_int32_t tcps_rcvwinupd; /* rcvd window update packets */
382 : u_int32_t tcps_pawsdrop; /* segments dropped due to PAWS */
383 : u_int32_t tcps_predack; /* times hdr predict ok for acks */
384 : u_int32_t tcps_preddat; /* times hdr predict ok for data pkts */
385 :
386 : u_int32_t tcps_pcbhashmiss; /* input packets missing pcb hash */
387 : u_int32_t tcps_noport; /* no socket on port */
388 : u_int32_t tcps_badsyn; /* SYN packet with src==dst rcv'ed */
389 : u_int32_t tcps_dropsyn; /* SYN packet dropped */
390 :
391 : u_int32_t tcps_rcvbadsig; /* rcvd bad/missing TCP signatures */
392 : u_int64_t tcps_rcvgoodsig; /* rcvd good TCP signatures */
393 : u_int32_t tcps_inswcsum; /* input software-checksummed packets */
394 : u_int32_t tcps_outswcsum; /* output software-checksummed packets */
395 :
396 : /* ECN stats */
397 : u_int32_t tcps_ecn_accepts; /* ecn connections accepted */
398 : u_int32_t tcps_ecn_rcvece; /* # of rcvd ece */
399 : u_int32_t tcps_ecn_rcvcwr; /* # of rcvd cwr */
400 : u_int32_t tcps_ecn_rcvce; /* # of rcvd ce in ip header */
401 : u_int32_t tcps_ecn_sndect; /* # of cwr sent */
402 : u_int32_t tcps_ecn_sndece; /* # of ece sent */
403 : u_int32_t tcps_ecn_sndcwr; /* # of cwr sent */
404 : u_int32_t tcps_cwr_ecn; /* # of cwnd reduced by ecn */
405 : u_int32_t tcps_cwr_frecovery; /* # of cwnd reduced by fastrecovery */
406 : u_int32_t tcps_cwr_timeout; /* # of cwnd reduced by timeout */
407 :
408 : /* These statistics deal with the SYN cache. */
409 : u_int64_t tcps_sc_added; /* # of entries added */
410 : u_int64_t tcps_sc_completed; /* # of connections completed */
411 : u_int64_t tcps_sc_timed_out; /* # of entries timed out */
412 : u_int64_t tcps_sc_overflowed; /* # dropped due to overflow */
413 : u_int64_t tcps_sc_reset; /* # dropped due to RST */
414 : u_int64_t tcps_sc_unreach; /* # dropped due to ICMP unreach */
415 : u_int64_t tcps_sc_bucketoverflow;/* # dropped due to bucket overflow */
416 : u_int64_t tcps_sc_aborted; /* # of entries aborted (no mem) */
417 : u_int64_t tcps_sc_dupesyn; /* # of duplicate SYNs received */
418 : u_int64_t tcps_sc_dropped; /* # of SYNs dropped (no route/mem) */
419 : u_int64_t tcps_sc_collisions; /* # of hash collisions */
420 : u_int64_t tcps_sc_retransmitted;/* # of retransmissions */
421 : u_int64_t tcps_sc_seedrandom; /* # of syn cache seeds with random */
422 : u_int64_t tcps_sc_hash_size; /* hash buckets in current syn cache */
423 : u_int64_t tcps_sc_entry_count; /* # of entries in current syn cache */
424 : u_int64_t tcps_sc_entry_limit; /* limit of syn cache entries */
425 : u_int64_t tcps_sc_bucket_maxlen;/* maximum # of entries in any bucket */
426 : u_int64_t tcps_sc_bucket_limit; /* limit of syn cache bucket list */
427 : u_int64_t tcps_sc_uses_left; /* use counter of current syn cache */
428 :
429 : u_int64_t tcps_conndrained; /* # of connections drained */
430 :
431 : u_int64_t tcps_sack_recovery_episode; /* SACK recovery episodes */
432 : u_int64_t tcps_sack_rexmits; /* SACK rexmit segments */
433 : u_int64_t tcps_sack_rexmit_bytes; /* SACK rexmit bytes */
434 : u_int64_t tcps_sack_rcv_opts; /* SACK options received */
435 : u_int64_t tcps_sack_snd_opts; /* SACK options sent */
436 : };
437 :
438 : /*
439 : * Names for TCP sysctl objects.
440 : */
441 :
442 : #define TCPCTL_RFC1323 1 /* enable/disable RFC1323 timestamps/scaling */
443 : #define TCPCTL_KEEPINITTIME 2 /* TCPT_KEEP value */
444 : #define TCPCTL_KEEPIDLE 3 /* allow tcp_keepidle to be changed */
445 : #define TCPCTL_KEEPINTVL 4 /* allow tcp_keepintvl to be changed */
446 : #define TCPCTL_SLOWHZ 5 /* return kernel idea of PR_SLOWHZ */
447 : #define TCPCTL_BADDYNAMIC 6 /* return bad dynamic port bitmap */
448 : #define TCPCTL_RECVSPACE 7 /* receive buffer space */
449 : #define TCPCTL_SENDSPACE 8 /* send buffer space */
450 : #define TCPCTL_IDENT 9 /* get connection owner */
451 : #define TCPCTL_SACK 10 /* selective acknowledgement, rfc 2018 */
452 : #define TCPCTL_MSSDFLT 11 /* Default maximum segment size */
453 : #define TCPCTL_RSTPPSLIMIT 12 /* RST pps limit */
454 : #define TCPCTL_ACK_ON_PUSH 13 /* ACK immediately on PUSH */
455 : #define TCPCTL_ECN 14 /* RFC3168 ECN */
456 : #define TCPCTL_SYN_CACHE_LIMIT 15 /* max size of comp. state engine */
457 : #define TCPCTL_SYN_BUCKET_LIMIT 16 /* max size of hash bucket */
458 : #define TCPCTL_RFC3390 17 /* enable/disable RFC3390 increased cwnd */
459 : #define TCPCTL_REASS_LIMIT 18 /* max entries for tcp reass queues */
460 : #define TCPCTL_DROP 19 /* drop tcp connection */
461 : #define TCPCTL_SACKHOLE_LIMIT 20 /* max entries for tcp sack queues */
462 : #define TCPCTL_STATS 21 /* TCP statistics */
463 : #define TCPCTL_ALWAYS_KEEPALIVE 22 /* assume SO_KEEPALIVE is always set */
464 : #define TCPCTL_SYN_USE_LIMIT 23 /* number of uses before reseeding hash */
465 : #define TCPCTL_ROOTONLY 24 /* return root only port bitmap */
466 : #define TCPCTL_SYN_HASH_SIZE 25 /* number of buckets in the hash */
467 : #define TCPCTL_MAXID 26
468 :
469 : #define TCPCTL_NAMES { \
470 : { 0, 0 }, \
471 : { "rfc1323", CTLTYPE_INT }, \
472 : { "keepinittime", CTLTYPE_INT }, \
473 : { "keepidle", CTLTYPE_INT }, \
474 : { "keepintvl", CTLTYPE_INT }, \
475 : { "slowhz", CTLTYPE_INT }, \
476 : { "baddynamic", CTLTYPE_STRUCT }, \
477 : { NULL, 0 }, \
478 : { NULL, 0 }, \
479 : { "ident", CTLTYPE_STRUCT }, \
480 : { "sack", CTLTYPE_INT }, \
481 : { "mssdflt", CTLTYPE_INT }, \
482 : { "rstppslimit", CTLTYPE_INT }, \
483 : { "ackonpush", CTLTYPE_INT }, \
484 : { "ecn", CTLTYPE_INT }, \
485 : { "syncachelimit", CTLTYPE_INT }, \
486 : { "synbucketlimit", CTLTYPE_INT }, \
487 : { "rfc3390", CTLTYPE_INT }, \
488 : { "reasslimit", CTLTYPE_INT }, \
489 : { "drop", CTLTYPE_STRUCT }, \
490 : { "sackholelimit", CTLTYPE_INT }, \
491 : { "stats", CTLTYPE_STRUCT }, \
492 : { "always_keepalive", CTLTYPE_INT }, \
493 : { "synuselimit", CTLTYPE_INT }, \
494 : { "rootonly", CTLTYPE_STRUCT }, \
495 : { "synhashsize", CTLTYPE_INT }, \
496 : }
497 :
498 : #define TCPCTL_VARS { \
499 : NULL, \
500 : &tcp_do_rfc1323, \
501 : &tcptv_keep_init, \
502 : &tcp_keepidle, \
503 : &tcp_keepintvl, \
504 : NULL, \
505 : NULL, \
506 : NULL, \
507 : NULL, \
508 : NULL, \
509 : NULL, \
510 : &tcp_mssdflt, \
511 : &tcp_rst_ppslim, \
512 : &tcp_ack_on_push, \
513 : NULL, \
514 : &tcp_syn_cache_limit, \
515 : &tcp_syn_bucket_limit, \
516 : &tcp_do_rfc3390, \
517 : NULL, \
518 : NULL, \
519 : NULL, \
520 : NULL, \
521 : NULL, \
522 : NULL, \
523 : NULL, \
524 : NULL \
525 : }
526 :
527 : struct tcp_ident_mapping {
528 : struct sockaddr_storage faddr, laddr;
529 : int euid, ruid;
530 : u_int rdomain;
531 : };
532 :
533 : #ifdef _KERNEL
534 :
535 : #include <sys/percpu.h>
536 :
537 : enum tcpstat_counters {
538 : tcps_connattempt,
539 : tcps_accepts,
540 : tcps_connects,
541 : tcps_drops,
542 : tcps_conndrops,
543 : tcps_closed,
544 : tcps_segstimed,
545 : tcps_rttupdated,
546 : tcps_delack,
547 : tcps_timeoutdrop,
548 : tcps_rexmttimeo,
549 : tcps_persisttimeo,
550 : tcps_persistdrop,
551 : tcps_keeptimeo,
552 : tcps_keepprobe,
553 : tcps_keepdrops,
554 : tcps_sndtotal,
555 : tcps_sndpack,
556 : tcps_sndbyte,
557 : tcps_sndrexmitpack,
558 : tcps_sndrexmitbyte,
559 : tcps_sndrexmitfast,
560 : tcps_sndacks,
561 : tcps_sndprobe,
562 : tcps_sndurg,
563 : tcps_sndwinup,
564 : tcps_sndctrl,
565 : tcps_rcvtotal,
566 : tcps_rcvpack,
567 : tcps_rcvbyte,
568 : tcps_rcvbadsum,
569 : tcps_rcvbadoff,
570 : tcps_rcvmemdrop,
571 : tcps_rcvnosec,
572 : tcps_rcvshort,
573 : tcps_rcvduppack,
574 : tcps_rcvdupbyte,
575 : tcps_rcvpartduppack,
576 : tcps_rcvpartdupbyte,
577 : tcps_rcvoopack,
578 : tcps_rcvoobyte,
579 : tcps_rcvpackafterwin,
580 : tcps_rcvbyteafterwin,
581 : tcps_rcvafterclose,
582 : tcps_rcvwinprobe,
583 : tcps_rcvdupack,
584 : tcps_rcvacktoomuch,
585 : tcps_rcvacktooold,
586 : tcps_rcvackpack,
587 : tcps_rcvackbyte,
588 : tcps_rcvwinupd,
589 : tcps_pawsdrop,
590 : tcps_predack,
591 : tcps_preddat,
592 : tcps_pcbhashmiss,
593 : tcps_noport,
594 : tcps_badsyn,
595 : tcps_dropsyn,
596 : tcps_rcvbadsig,
597 : tcps_rcvgoodsig,
598 : tcps_inswcsum,
599 : tcps_outswcsum,
600 : tcps_ecn_accepts,
601 : tcps_ecn_rcvece,
602 : tcps_ecn_rcvcwr,
603 : tcps_ecn_rcvce,
604 : tcps_ecn_sndect,
605 : tcps_ecn_sndece,
606 : tcps_ecn_sndcwr,
607 : tcps_cwr_ecn,
608 : tcps_cwr_frecovery,
609 : tcps_cwr_timeout,
610 : tcps_sc_added,
611 : tcps_sc_completed,
612 : tcps_sc_timed_out,
613 : tcps_sc_overflowed,
614 : tcps_sc_reset,
615 : tcps_sc_unreach,
616 : tcps_sc_bucketoverflow,
617 : tcps_sc_aborted,
618 : tcps_sc_dupesyn,
619 : tcps_sc_dropped,
620 : tcps_sc_collisions,
621 : tcps_sc_retransmitted,
622 : tcps_sc_seedrandom,
623 : tcps_sc_hash_size,
624 : tcps_sc_entry_count,
625 : tcps_sc_entry_limit,
626 : tcps_sc_bucket_maxlen,
627 : tcps_sc_bucket_limit,
628 : tcps_sc_uses_left,
629 : tcps_conndrained,
630 : tcps_sack_recovery_episode,
631 : tcps_sack_rexmits,
632 : tcps_sack_rexmit_bytes,
633 : tcps_sack_rcv_opts,
634 : tcps_sack_snd_opts,
635 : tcps_ncounters,
636 : };
637 :
638 : extern struct cpumem *tcpcounters;
639 :
640 : static inline void
641 0 : tcpstat_inc(enum tcpstat_counters c)
642 : {
643 0 : counters_inc(tcpcounters, c);
644 0 : }
645 :
646 : static inline void
647 0 : tcpstat_add(enum tcpstat_counters c, uint64_t v)
648 : {
649 0 : counters_add(tcpcounters, c, v);
650 0 : }
651 :
652 : static inline void
653 0 : tcpstat_pkt(enum tcpstat_counters pcounter, enum tcpstat_counters bcounter,
654 : uint64_t v)
655 : {
656 0 : counters_pkt(tcpcounters, pcounter, bcounter, v);
657 0 : }
658 :
659 : extern struct pool tcpcb_pool;
660 : extern struct inpcbtable tcbtable; /* head of queue of active tcpcb's */
661 : extern u_int32_t tcp_now; /* for RFC 1323 timestamps */
662 : extern int tcp_do_rfc1323; /* enabled/disabled? */
663 : extern int tcptv_keep_init; /* time to keep alive the initial SYN packet */
664 : extern int tcp_mssdflt; /* default maximum segment size */
665 : extern int tcp_rst_ppslim; /* maximum outgoing RST packet per second */
666 : extern int tcp_ack_on_push; /* ACK immediately on PUSH */
667 : extern int tcp_do_sack; /* SACK enabled/disabled */
668 : extern struct pool sackhl_pool;
669 : extern int tcp_sackhole_limit; /* max entries for tcp sack queues */
670 : extern int tcp_do_ecn; /* RFC3168 ECN enabled/disabled? */
671 : extern int tcp_do_rfc3390; /* RFC3390 Increasing TCP's Initial Window */
672 :
673 : extern struct pool tcpqe_pool;
674 : extern int tcp_reass_limit; /* max entries for tcp reass queues */
675 :
676 : extern int tcp_syn_hash_size; /* adjustable size of the hash array */
677 : extern int tcp_syn_cache_limit; /* max entries for compressed state engine */
678 : extern int tcp_syn_bucket_limit;/* max entries per hash bucket */
679 : extern int tcp_syn_use_limit; /* number of uses before reseeding hash */
680 : extern struct syn_cache_set tcp_syn_cache[];
681 : extern int tcp_syn_cache_active; /* active syn cache, may be 0 or 1 */
682 :
683 : void tcp_canceltimers(struct tcpcb *);
684 : struct tcpcb *
685 : tcp_close(struct tcpcb *);
686 : int tcp_freeq(struct tcpcb *);
687 : #ifdef INET6
688 : void tcp6_ctlinput(int, struct sockaddr *, u_int, void *);
689 : #endif
690 : void tcp_ctlinput(int, struct sockaddr *, u_int, void *);
691 : int tcp_ctloutput(int, struct socket *, int, int, struct mbuf *);
692 : struct tcpcb *
693 : tcp_disconnect(struct tcpcb *);
694 : struct tcpcb *
695 : tcp_drop(struct tcpcb *, int);
696 : int tcp_dooptions(struct tcpcb *, u_char *, int, struct tcphdr *,
697 : struct mbuf *, int, struct tcp_opt_info *, u_int);
698 : void tcp_init(void);
699 : int tcp_input(struct mbuf **, int *, int, int);
700 : int tcp_mss(struct tcpcb *, int);
701 : void tcp_mss_update(struct tcpcb *);
702 : u_int tcp_hdrsz(struct tcpcb *);
703 : void tcp_mtudisc(struct inpcb *, int);
704 : void tcp_mtudisc_increase(struct inpcb *, int);
705 : #ifdef INET6
706 : void tcp6_mtudisc(struct inpcb *, int);
707 : void tcp6_mtudisc_callback(struct sockaddr_in6 *, u_int);
708 : #endif
709 : struct tcpcb *
710 : tcp_newtcpcb(struct inpcb *);
711 : void tcp_notify(struct inpcb *, int);
712 : int tcp_output(struct tcpcb *);
713 : void tcp_pulloutofband(struct socket *, u_int, struct mbuf *, int);
714 : int tcp_reass(struct tcpcb *, struct tcphdr *, struct mbuf *, int *);
715 : void tcp_rscale(struct tcpcb *, u_long);
716 : void tcp_respond(struct tcpcb *, caddr_t, struct tcphdr *, tcp_seq,
717 : tcp_seq, int, u_int);
718 : void tcp_setpersist(struct tcpcb *);
719 : void tcp_update_sndspace(struct tcpcb *);
720 : void tcp_update_rcvspace(struct tcpcb *);
721 : void tcp_slowtimo(void);
722 : struct mbuf *
723 : tcp_template(struct tcpcb *);
724 : void tcp_trace(short, short, struct tcpcb *, struct tcpcb *, caddr_t,
725 : int, int);
726 : struct tcpcb *
727 : tcp_usrclosed(struct tcpcb *);
728 : int tcp_sysctl(int *, u_int, void *, size_t *, void *, size_t);
729 : int tcp_usrreq(struct socket *,
730 : int, struct mbuf *, struct mbuf *, struct mbuf *, struct proc *);
731 : int tcp_attach(struct socket *, int);
732 : int tcp_detach(struct socket *);
733 : void tcp_xmit_timer(struct tcpcb *, int);
734 : void tcpdropoldhalfopen(struct tcpcb *, u_int16_t);
735 : void tcp_sack_option(struct tcpcb *,struct tcphdr *,u_char *,int);
736 : void tcp_update_sack_list(struct tcpcb *tp, tcp_seq, tcp_seq);
737 : void tcp_del_sackholes(struct tcpcb *, struct tcphdr *);
738 : void tcp_clean_sackreport(struct tcpcb *tp);
739 : void tcp_sack_adjust(struct tcpcb *tp);
740 : struct sackhole *
741 : tcp_sack_output(struct tcpcb *tp);
742 : #ifdef DEBUG
743 : void tcp_print_holes(struct tcpcb *tp);
744 : #endif
745 : u_long tcp_seq_subtract(u_long, u_long );
746 : #ifdef TCP_SIGNATURE
747 : int tcp_signature_apply(caddr_t, caddr_t, unsigned int);
748 : int tcp_signature(struct tdb *, int, struct mbuf *, struct tcphdr *,
749 : int, int, char *);
750 : #endif /* TCP_SIGNATURE */
751 : void tcp_set_iss_tsm(struct tcpcb *);
752 :
753 : void syn_cache_unreach(struct sockaddr *, struct sockaddr *,
754 : struct tcphdr *, u_int);
755 : void syn_cache_init(void);
756 : void syn_cache_cleanup(struct tcpcb *);
757 :
758 : #endif /* _KERNEL */
759 : #endif /* _NETINET_TCP_VAR_H_ */
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