2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
5 * The Regents of the University of California. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
34 #include <sys/cdefs.h>
36 #include "opt_inet6.h"
37 #include "opt_ipsec.h"
38 #include "opt_kern_tls.h"
40 #include <sys/param.h>
41 #include <sys/systm.h>
43 #include <sys/callout.h>
44 #include <sys/eventhandler.h>
46 #include <sys/hhook.h>
48 #include <sys/kernel.h>
50 #include <sys/khelp.h>
55 #include <sys/qmath.h>
56 #include <sys/stats.h>
57 #include <sys/sysctl.h>
59 #include <sys/malloc.h>
60 #include <sys/refcount.h>
65 #include <sys/socket.h>
66 #include <sys/socketvar.h>
67 #include <sys/protosw.h>
68 #include <sys/random.h>
72 #include <net/route.h>
73 #include <net/route/nhop.h>
75 #include <net/if_var.h>
76 #include <net/if_private.h>
79 #include <netinet/in.h>
80 #include <netinet/in_fib.h>
81 #include <netinet/in_kdtrace.h>
82 #include <netinet/in_pcb.h>
83 #include <netinet/in_systm.h>
84 #include <netinet/in_var.h>
85 #include <netinet/ip.h>
86 #include <netinet/ip_icmp.h>
87 #include <netinet/ip_var.h>
89 #include <netinet/icmp6.h>
90 #include <netinet/ip6.h>
91 #include <netinet6/in6_fib.h>
92 #include <netinet6/in6_pcb.h>
93 #include <netinet6/ip6_var.h>
94 #include <netinet6/scope6_var.h>
95 #include <netinet6/nd6.h>
98 #include <netinet/tcp.h>
102 #include <netinet/tcp_fsm.h>
103 #include <netinet/tcp_seq.h>
104 #include <netinet/tcp_timer.h>
105 #include <netinet/tcp_var.h>
106 #include <netinet/tcp_ecn.h>
107 #include <netinet/tcp_log_buf.h>
108 #include <netinet/tcp_syncache.h>
109 #include <netinet/tcp_hpts.h>
110 #include <netinet/tcp_lro.h>
111 #include <netinet/cc/cc.h>
112 #include <netinet/tcpip.h>
113 #include <netinet/tcp_fastopen.h>
114 #include <netinet/tcp_accounting.h>
116 #include <netinet/tcp_pcap.h>
119 #include <netinet/tcp_offload.h>
121 #include <netinet/udp.h>
122 #include <netinet/udp_var.h>
124 #include <netinet6/tcp6_var.h>
127 #include <netipsec/ipsec_support.h>
129 #include <machine/in_cksum.h>
130 #include <crypto/siphash/siphash.h>
132 #include <security/mac/mac_framework.h>
135 static ip6proto_ctlinput_t tcp6_ctlinput;
136 static udp_tun_icmp_t tcp6_ctlinput_viaudp;
139 VNET_DEFINE(int, tcp_mssdflt) = TCP_MSS;
141 VNET_DEFINE(int, tcp_v6mssdflt) = TCP6_MSS;
144 #ifdef TCP_SAD_DETECTION
145 /* Sack attack detection thresholds and such */
146 SYSCTL_NODE(_net_inet_tcp, OID_AUTO, sack_attack,
147 CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
148 "Sack Attack detection thresholds");
149 int32_t tcp_force_detection = 0;
150 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, force_detection,
152 &tcp_force_detection, 0,
153 "Do we force detection even if the INP has it off?");
154 int32_t tcp_sad_limit = 10000;
155 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, limit,
157 &tcp_sad_limit, 10000,
158 "If SaD is enabled, what is the limit to sendmap entries (0 = unlimited)?");
159 int32_t tcp_sack_to_ack_thresh = 700; /* 70 % */
160 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, sack_to_ack_thresh,
162 &tcp_sack_to_ack_thresh, 700,
163 "Percentage of sacks to acks we must see above (10.1 percent is 101)?");
164 int32_t tcp_sack_to_move_thresh = 600; /* 60 % */
165 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, move_thresh,
167 &tcp_sack_to_move_thresh, 600,
168 "Percentage of sack moves we must see above (10.1 percent is 101)");
169 int32_t tcp_restoral_thresh = 450; /* 45 % (sack:2:ack -25%) (mv:ratio -15%) **/
170 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, restore_thresh,
172 &tcp_restoral_thresh, 450,
173 "Percentage of sack to ack percentage we must see below to restore(10.1 percent is 101)");
174 int32_t tcp_sad_decay_val = 800;
175 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, decay_per,
177 &tcp_sad_decay_val, 800,
178 "The decay percentage (10.1 percent equals 101 )");
179 int32_t tcp_map_minimum = 500;
180 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, nummaps,
182 &tcp_map_minimum, 500,
183 "Number of Map enteries before we start detection");
184 int32_t tcp_sad_pacing_interval = 2000;
185 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, sad_pacing_int,
187 &tcp_sad_pacing_interval, 2000,
188 "What is the minimum pacing interval for a classified attacker?");
190 int32_t tcp_sad_low_pps = 100;
191 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, sad_low_pps,
193 &tcp_sad_low_pps, 100,
194 "What is the input pps that below which we do not decay?");
196 uint32_t tcp_ack_war_time_window = 1000;
197 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, ack_war_timewindow,
199 &tcp_ack_war_time_window, 1000,
200 "If the tcp_stack does ack-war prevention how many milliseconds are in its time window?");
201 uint32_t tcp_ack_war_cnt = 5;
202 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, ack_war_cnt,
205 "If the tcp_stack does ack-war prevention how many acks can be sent in its time window?");
207 struct rwlock tcp_function_lock;
210 sysctl_net_inet_tcp_mss_check(SYSCTL_HANDLER_ARGS)
215 error = sysctl_handle_int(oidp, &new, 0, req);
216 if (error == 0 && req->newptr) {
217 if (new < TCP_MINMSS)
225 SYSCTL_PROC(_net_inet_tcp, TCPCTL_MSSDFLT, mssdflt,
226 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
227 &VNET_NAME(tcp_mssdflt), 0, &sysctl_net_inet_tcp_mss_check, "I",
228 "Default TCP Maximum Segment Size");
232 sysctl_net_inet_tcp_mss_v6_check(SYSCTL_HANDLER_ARGS)
236 new = V_tcp_v6mssdflt;
237 error = sysctl_handle_int(oidp, &new, 0, req);
238 if (error == 0 && req->newptr) {
239 if (new < TCP_MINMSS)
242 V_tcp_v6mssdflt = new;
247 SYSCTL_PROC(_net_inet_tcp, TCPCTL_V6MSSDFLT, v6mssdflt,
248 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
249 &VNET_NAME(tcp_v6mssdflt), 0, &sysctl_net_inet_tcp_mss_v6_check, "I",
250 "Default TCP Maximum Segment Size for IPv6");
254 * Minimum MSS we accept and use. This prevents DoS attacks where
255 * we are forced to a ridiculous low MSS like 20 and send hundreds
256 * of packets instead of one. The effect scales with the available
257 * bandwidth and quickly saturates the CPU and network interface
258 * with packet generation and sending. Set to zero to disable MINMSS
259 * checking. This setting prevents us from sending too small packets.
261 VNET_DEFINE(int, tcp_minmss) = TCP_MINMSS;
262 SYSCTL_INT(_net_inet_tcp, OID_AUTO, minmss, CTLFLAG_VNET | CTLFLAG_RW,
263 &VNET_NAME(tcp_minmss), 0,
264 "Minimum TCP Maximum Segment Size");
266 VNET_DEFINE(int, tcp_do_rfc1323) = 1;
267 SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, CTLFLAG_VNET | CTLFLAG_RW,
268 &VNET_NAME(tcp_do_rfc1323), 0,
269 "Enable rfc1323 (high performance TCP) extensions");
272 * As of June 2021, several TCP stacks violate RFC 7323 from September 2014.
273 * Some stacks negotiate TS, but never send them after connection setup. Some
274 * stacks negotiate TS, but don't send them when sending keep-alive segments.
275 * These include modern widely deployed TCP stacks.
276 * Therefore tolerating violations for now...
278 VNET_DEFINE(int, tcp_tolerate_missing_ts) = 1;
279 SYSCTL_INT(_net_inet_tcp, OID_AUTO, tolerate_missing_ts, CTLFLAG_VNET | CTLFLAG_RW,
280 &VNET_NAME(tcp_tolerate_missing_ts), 0,
281 "Tolerate missing TCP timestamps");
283 VNET_DEFINE(int, tcp_ts_offset_per_conn) = 1;
284 SYSCTL_INT(_net_inet_tcp, OID_AUTO, ts_offset_per_conn, CTLFLAG_VNET | CTLFLAG_RW,
285 &VNET_NAME(tcp_ts_offset_per_conn), 0,
286 "Initialize TCP timestamps per connection instead of per host pair");
288 /* How many connections are pacing */
289 static volatile uint32_t number_of_tcp_connections_pacing = 0;
290 static uint32_t shadow_num_connections = 0;
291 static counter_u64_t tcp_pacing_failures;
293 static int tcp_pacing_limit = 10000;
294 SYSCTL_INT(_net_inet_tcp, OID_AUTO, pacing_limit, CTLFLAG_RW,
295 &tcp_pacing_limit, 1000,
296 "If the TCP stack does pacing, is there a limit (-1 = no, 0 = no pacing N = number of connections)");
298 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, pacing_count, CTLFLAG_RD,
299 &shadow_num_connections, 0, "Number of TCP connections being paced");
301 SYSCTL_COUNTER_U64(_net_inet_tcp, OID_AUTO, pacing_failures, CTLFLAG_RD,
302 &tcp_pacing_failures, "Number of times we failed to enable pacing to avoid exceeding the limit");
304 static int tcp_log_debug = 0;
305 SYSCTL_INT(_net_inet_tcp, OID_AUTO, log_debug, CTLFLAG_RW,
306 &tcp_log_debug, 0, "Log errors caused by incoming TCP segments");
308 static int tcp_tcbhashsize;
309 SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
310 &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable");
312 static int do_tcpdrain = 1;
313 SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0,
314 "Enable tcp_drain routine for extra help when low on mbufs");
316 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_VNET | CTLFLAG_RD,
317 &VNET_NAME(tcbinfo.ipi_count), 0, "Number of active PCBs");
319 VNET_DEFINE_STATIC(int, icmp_may_rst) = 1;
320 #define V_icmp_may_rst VNET(icmp_may_rst)
321 SYSCTL_INT(_net_inet_tcp, OID_AUTO, icmp_may_rst, CTLFLAG_VNET | CTLFLAG_RW,
322 &VNET_NAME(icmp_may_rst), 0,
323 "Certain ICMP unreachable messages may abort connections in SYN_SENT");
325 VNET_DEFINE_STATIC(int, tcp_isn_reseed_interval) = 0;
326 #define V_tcp_isn_reseed_interval VNET(tcp_isn_reseed_interval)
327 SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_VNET | CTLFLAG_RW,
328 &VNET_NAME(tcp_isn_reseed_interval), 0,
329 "Seconds between reseeding of ISN secret");
331 static int tcp_soreceive_stream;
332 SYSCTL_INT(_net_inet_tcp, OID_AUTO, soreceive_stream, CTLFLAG_RDTUN,
333 &tcp_soreceive_stream, 0, "Using soreceive_stream for TCP sockets");
335 VNET_DEFINE(uma_zone_t, sack_hole_zone);
336 #define V_sack_hole_zone VNET(sack_hole_zone)
337 VNET_DEFINE(uint32_t, tcp_map_entries_limit) = 0; /* unlimited */
339 sysctl_net_inet_tcp_map_limit_check(SYSCTL_HANDLER_ARGS)
344 new = V_tcp_map_entries_limit;
345 error = sysctl_handle_int(oidp, &new, 0, req);
346 if (error == 0 && req->newptr) {
347 /* only allow "0" and value > minimum */
348 if (new > 0 && new < TCP_MIN_MAP_ENTRIES_LIMIT)
351 V_tcp_map_entries_limit = new;
355 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, map_limit,
356 CTLFLAG_VNET | CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
357 &VNET_NAME(tcp_map_entries_limit), 0,
358 &sysctl_net_inet_tcp_map_limit_check, "IU",
359 "Total sendmap entries limit");
361 VNET_DEFINE(uint32_t, tcp_map_split_limit) = 0; /* unlimited */
362 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, split_limit, CTLFLAG_VNET | CTLFLAG_RW,
363 &VNET_NAME(tcp_map_split_limit), 0,
364 "Total sendmap split entries limit");
367 VNET_DEFINE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST+1]);
370 #define TS_OFFSET_SECRET_LENGTH SIPHASH_KEY_LENGTH
371 VNET_DEFINE_STATIC(u_char, ts_offset_secret[TS_OFFSET_SECRET_LENGTH]);
372 #define V_ts_offset_secret VNET(ts_offset_secret)
374 static int tcp_default_fb_init(struct tcpcb *tp, void **ptr);
375 static void tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged);
376 static int tcp_default_handoff_ok(struct tcpcb *tp);
377 static struct inpcb *tcp_notify(struct inpcb *, int);
378 static struct inpcb *tcp_mtudisc_notify(struct inpcb *, int);
379 static struct inpcb *tcp_mtudisc(struct inpcb *, int);
380 static struct inpcb *tcp_drop_syn_sent(struct inpcb *, int);
381 static char * tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th,
382 const void *ip4hdr, const void *ip6hdr);
383 static void tcp_default_switch_failed(struct tcpcb *tp);
384 static ipproto_ctlinput_t tcp_ctlinput;
385 static udp_tun_icmp_t tcp_ctlinput_viaudp;
387 static struct tcp_function_block tcp_def_funcblk = {
388 .tfb_tcp_block_name = "freebsd",
389 .tfb_tcp_output = tcp_default_output,
390 .tfb_tcp_do_segment = tcp_do_segment,
391 .tfb_tcp_ctloutput = tcp_default_ctloutput,
392 .tfb_tcp_handoff_ok = tcp_default_handoff_ok,
393 .tfb_tcp_fb_init = tcp_default_fb_init,
394 .tfb_tcp_fb_fini = tcp_default_fb_fini,
395 .tfb_switch_failed = tcp_default_switch_failed,
398 static int tcp_fb_cnt = 0;
399 struct tcp_funchead t_functions;
400 VNET_DEFINE_STATIC(struct tcp_function_block *, tcp_func_set_ptr) = &tcp_def_funcblk;
401 #define V_tcp_func_set_ptr VNET(tcp_func_set_ptr)
404 tcp_record_dsack(struct tcpcb *tp, tcp_seq start, tcp_seq end, int tlp)
406 TCPSTAT_INC(tcps_dsack_count);
409 if (SEQ_GT(end, start)) {
410 tp->t_dsack_bytes += (end - start);
411 TCPSTAT_ADD(tcps_dsack_bytes, (end - start));
413 tp->t_dsack_tlp_bytes += (start - end);
414 TCPSTAT_ADD(tcps_dsack_bytes, (start - end));
417 if (SEQ_GT(end, start)) {
418 tp->t_dsack_bytes += (end - start);
419 TCPSTAT_ADD(tcps_dsack_tlp_bytes, (end - start));
421 tp->t_dsack_tlp_bytes += (start - end);
422 TCPSTAT_ADD(tcps_dsack_tlp_bytes, (start - end));
427 static struct tcp_function_block *
428 find_tcp_functions_locked(struct tcp_function_set *fs)
430 struct tcp_function *f;
431 struct tcp_function_block *blk=NULL;
433 TAILQ_FOREACH(f, &t_functions, tf_next) {
434 if (strcmp(f->tf_name, fs->function_set_name) == 0) {
442 static struct tcp_function_block *
443 find_tcp_fb_locked(struct tcp_function_block *blk, struct tcp_function **s)
445 struct tcp_function_block *rblk=NULL;
446 struct tcp_function *f;
448 TAILQ_FOREACH(f, &t_functions, tf_next) {
449 if (f->tf_fb == blk) {
460 struct tcp_function_block *
461 find_and_ref_tcp_functions(struct tcp_function_set *fs)
463 struct tcp_function_block *blk;
465 rw_rlock(&tcp_function_lock);
466 blk = find_tcp_functions_locked(fs);
468 refcount_acquire(&blk->tfb_refcnt);
469 rw_runlock(&tcp_function_lock);
473 struct tcp_function_block *
474 find_and_ref_tcp_fb(struct tcp_function_block *blk)
476 struct tcp_function_block *rblk;
478 rw_rlock(&tcp_function_lock);
479 rblk = find_tcp_fb_locked(blk, NULL);
481 refcount_acquire(&rblk->tfb_refcnt);
482 rw_runlock(&tcp_function_lock);
486 /* Find a matching alias for the given tcp_function_block. */
488 find_tcp_function_alias(struct tcp_function_block *blk,
489 struct tcp_function_set *fs)
491 struct tcp_function *f;
495 rw_rlock(&tcp_function_lock);
496 TAILQ_FOREACH(f, &t_functions, tf_next) {
497 if ((f->tf_fb == blk) &&
498 (strncmp(f->tf_name, blk->tfb_tcp_block_name,
499 TCP_FUNCTION_NAME_LEN_MAX) != 0)) {
500 /* Matching function block with different name. */
501 strncpy(fs->function_set_name, f->tf_name,
502 TCP_FUNCTION_NAME_LEN_MAX);
507 /* Null terminate the string appropriately. */
509 fs->function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
511 fs->function_set_name[0] = '\0';
513 rw_runlock(&tcp_function_lock);
517 static struct tcp_function_block *
518 find_and_ref_tcp_default_fb(void)
520 struct tcp_function_block *rblk;
522 rw_rlock(&tcp_function_lock);
523 rblk = V_tcp_func_set_ptr;
524 refcount_acquire(&rblk->tfb_refcnt);
525 rw_runlock(&tcp_function_lock);
530 tcp_switch_back_to_default(struct tcpcb *tp)
532 struct tcp_function_block *tfb;
535 KASSERT(tp->t_fb != &tcp_def_funcblk,
536 ("%s: called by the built-in default stack", __func__));
539 * Now, we'll find a new function block to use.
540 * Start by trying the current user-selected
541 * default, unless this stack is the user-selected
544 tfb = find_and_ref_tcp_default_fb();
545 if (tfb == tp->t_fb) {
546 refcount_release(&tfb->tfb_refcnt);
549 /* Does the stack accept this connection? */
550 if (tfb != NULL && tfb->tfb_tcp_handoff_ok != NULL &&
551 (*tfb->tfb_tcp_handoff_ok)(tp)) {
552 refcount_release(&tfb->tfb_refcnt);
555 /* Try to use that stack. */
557 /* Initialize the new stack. If it succeeds, we are done. */
558 if (tfb->tfb_tcp_fb_init == NULL ||
559 (*tfb->tfb_tcp_fb_init)(tp, &ptr) == 0) {
560 /* Release the old stack */
561 if (tp->t_fb->tfb_tcp_fb_fini != NULL)
562 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
563 refcount_release(&tp->t_fb->tfb_refcnt);
564 /* Now set in all the pointers */
570 * Initialization failed. Release the reference count on
571 * the looked up default stack.
573 refcount_release(&tfb->tfb_refcnt);
577 * If that wasn't feasible, use the built-in default
578 * stack which is not allowed to reject anyone.
580 tfb = find_and_ref_tcp_fb(&tcp_def_funcblk);
582 /* there always should be a default */
583 panic("Can't refer to tcp_def_funcblk");
585 if (tfb->tfb_tcp_handoff_ok != NULL) {
586 if ((*tfb->tfb_tcp_handoff_ok) (tp)) {
587 /* The default stack cannot say no */
588 panic("Default stack rejects a new session?");
591 if (tfb->tfb_tcp_fb_init != NULL &&
592 (*tfb->tfb_tcp_fb_init)(tp, &ptr)) {
593 /* The default stack cannot fail */
594 panic("Default stack initialization failed");
596 /* Now release the old stack */
597 if (tp->t_fb->tfb_tcp_fb_fini != NULL)
598 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
599 refcount_release(&tp->t_fb->tfb_refcnt);
600 /* And set in the pointers to the new */
606 tcp_recv_udp_tunneled_packet(struct mbuf *m, int off, struct inpcb *inp,
607 const struct sockaddr *sa, void *ctx)
618 TCPSTAT_INC(tcps_tunneled_pkts);
619 if ((m->m_flags & M_PKTHDR) == 0) {
620 /* Can't handle one that is not a pkt hdr */
621 TCPSTAT_INC(tcps_tunneled_errs);
624 thlen = sizeof(struct tcphdr);
625 if (m->m_len < off + sizeof(struct udphdr) + thlen &&
626 (m = m_pullup(m, off + sizeof(struct udphdr) + thlen)) == NULL) {
627 TCPSTAT_INC(tcps_tunneled_errs);
630 iph = mtod(m, struct ip *);
631 uh = (struct udphdr *)((caddr_t)iph + off);
632 th = (struct tcphdr *)(uh + 1);
633 thlen = th->th_off << 2;
634 if (m->m_len < off + sizeof(struct udphdr) + thlen) {
635 m = m_pullup(m, off + sizeof(struct udphdr) + thlen);
637 TCPSTAT_INC(tcps_tunneled_errs);
640 iph = mtod(m, struct ip *);
641 uh = (struct udphdr *)((caddr_t)iph + off);
642 th = (struct tcphdr *)(uh + 1);
645 m->m_pkthdr.tcp_tun_port = port = uh->uh_sport;
646 bcopy(th, uh, m->m_len - off);
647 m->m_len -= sizeof(struct udphdr);
648 m->m_pkthdr.len -= sizeof(struct udphdr);
650 * We use the same algorithm for
651 * both UDP and TCP for c-sum. So
652 * the code in tcp_input will skip
653 * the checksum. So we do nothing
654 * with the flag (m->m_pkthdr.csum_flags).
659 iph->ip_len = htons(ntohs(iph->ip_len) - sizeof(struct udphdr));
660 tcp_input_with_port(&m, &off, IPPROTO_TCP, port);
664 case IPV6_VERSION >> 4:
665 ip6 = mtod(m, struct ip6_hdr *);
666 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - sizeof(struct udphdr));
667 tcp6_input_with_port(&m, &off, IPPROTO_TCP, port);
682 sysctl_net_inet_default_tcp_functions(SYSCTL_HANDLER_ARGS)
685 struct tcp_function_set fs;
686 struct tcp_function_block *blk;
688 memset(&fs, 0, sizeof(fs));
689 rw_rlock(&tcp_function_lock);
690 blk = find_tcp_fb_locked(V_tcp_func_set_ptr, NULL);
693 strcpy(fs.function_set_name, blk->tfb_tcp_block_name);
694 fs.pcbcnt = blk->tfb_refcnt;
696 rw_runlock(&tcp_function_lock);
697 error = sysctl_handle_string(oidp, fs.function_set_name,
698 sizeof(fs.function_set_name), req);
700 /* Check for error or no change */
701 if (error != 0 || req->newptr == NULL)
704 rw_wlock(&tcp_function_lock);
705 blk = find_tcp_functions_locked(&fs);
707 (blk->tfb_flags & TCP_FUNC_BEING_REMOVED)) {
711 V_tcp_func_set_ptr = blk;
713 rw_wunlock(&tcp_function_lock);
717 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_default,
718 CTLFLAG_VNET | CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
719 NULL, 0, sysctl_net_inet_default_tcp_functions, "A",
720 "Set/get the default TCP functions");
723 sysctl_net_inet_list_available(SYSCTL_HANDLER_ARGS)
725 int error, cnt, linesz;
726 struct tcp_function *f;
732 rw_rlock(&tcp_function_lock);
733 TAILQ_FOREACH(f, &t_functions, tf_next) {
736 rw_runlock(&tcp_function_lock);
738 bufsz = (cnt+2) * ((TCP_FUNCTION_NAME_LEN_MAX * 2) + 13) + 1;
739 buffer = malloc(bufsz, M_TEMP, M_WAITOK);
744 linesz = snprintf(cp, bufsz, "\n%-32s%c %-32s %s\n", "Stack", 'D',
745 "Alias", "PCB count");
750 rw_rlock(&tcp_function_lock);
751 TAILQ_FOREACH(f, &t_functions, tf_next) {
752 alias = (f->tf_name != f->tf_fb->tfb_tcp_block_name);
753 linesz = snprintf(cp, bufsz, "%-32s%c %-32s %u\n",
754 f->tf_fb->tfb_tcp_block_name,
755 (f->tf_fb == V_tcp_func_set_ptr) ? '*' : ' ',
756 alias ? f->tf_name : "-",
757 f->tf_fb->tfb_refcnt);
758 if (linesz >= bufsz) {
766 rw_runlock(&tcp_function_lock);
768 error = sysctl_handle_string(oidp, buffer, outsz + 1, req);
769 free(buffer, M_TEMP);
773 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_available,
774 CTLFLAG_VNET | CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
775 NULL, 0, sysctl_net_inet_list_available, "A",
776 "list available TCP Function sets");
778 VNET_DEFINE(int, tcp_udp_tunneling_port) = TCP_TUNNELING_PORT_DEFAULT;
781 VNET_DEFINE(struct socket *, udp4_tun_socket) = NULL;
782 #define V_udp4_tun_socket VNET(udp4_tun_socket)
785 VNET_DEFINE(struct socket *, udp6_tun_socket) = NULL;
786 #define V_udp6_tun_socket VNET(udp6_tun_socket)
789 static struct sx tcpoudp_lock;
792 tcp_over_udp_stop(void)
795 sx_assert(&tcpoudp_lock, SA_XLOCKED);
798 if (V_udp4_tun_socket != NULL) {
799 soclose(V_udp4_tun_socket);
800 V_udp4_tun_socket = NULL;
804 if (V_udp6_tun_socket != NULL) {
805 soclose(V_udp6_tun_socket);
806 V_udp6_tun_socket = NULL;
812 tcp_over_udp_start(void)
817 struct sockaddr_in sin;
820 struct sockaddr_in6 sin6;
823 sx_assert(&tcpoudp_lock, SA_XLOCKED);
825 port = V_tcp_udp_tunneling_port;
826 if (ntohs(port) == 0) {
827 /* Must have a port set */
831 if (V_udp4_tun_socket != NULL) {
832 /* Already running -- must stop first */
837 if (V_udp6_tun_socket != NULL) {
838 /* Already running -- must stop first */
843 if ((ret = socreate(PF_INET, &V_udp4_tun_socket,
844 SOCK_DGRAM, IPPROTO_UDP,
845 curthread->td_ucred, curthread))) {
849 /* Call the special UDP hook. */
850 if ((ret = udp_set_kernel_tunneling(V_udp4_tun_socket,
851 tcp_recv_udp_tunneled_packet,
857 /* Ok, we have a socket, bind it to the port. */
858 memset(&sin, 0, sizeof(struct sockaddr_in));
859 sin.sin_len = sizeof(struct sockaddr_in);
860 sin.sin_family = AF_INET;
861 sin.sin_port = htons(port);
862 if ((ret = sobind(V_udp4_tun_socket,
863 (struct sockaddr *)&sin, curthread))) {
869 if ((ret = socreate(PF_INET6, &V_udp6_tun_socket,
870 SOCK_DGRAM, IPPROTO_UDP,
871 curthread->td_ucred, curthread))) {
875 /* Call the special UDP hook. */
876 if ((ret = udp_set_kernel_tunneling(V_udp6_tun_socket,
877 tcp_recv_udp_tunneled_packet,
878 tcp6_ctlinput_viaudp,
883 /* Ok, we have a socket, bind it to the port. */
884 memset(&sin6, 0, sizeof(struct sockaddr_in6));
885 sin6.sin6_len = sizeof(struct sockaddr_in6);
886 sin6.sin6_family = AF_INET6;
887 sin6.sin6_port = htons(port);
888 if ((ret = sobind(V_udp6_tun_socket,
889 (struct sockaddr *)&sin6, curthread))) {
898 sysctl_net_inet_tcp_udp_tunneling_port_check(SYSCTL_HANDLER_ARGS)
903 old = V_tcp_udp_tunneling_port;
905 error = sysctl_handle_int(oidp, &new, 0, req);
907 (req->newptr != NULL)) {
908 if ((new < TCP_TUNNELING_PORT_MIN) ||
909 (new > TCP_TUNNELING_PORT_MAX)) {
912 sx_xlock(&tcpoudp_lock);
913 V_tcp_udp_tunneling_port = new;
918 error = tcp_over_udp_start();
920 V_tcp_udp_tunneling_port = 0;
923 sx_xunlock(&tcpoudp_lock);
929 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, udp_tunneling_port,
930 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
931 &VNET_NAME(tcp_udp_tunneling_port),
932 0, &sysctl_net_inet_tcp_udp_tunneling_port_check, "IU",
933 "Tunneling port for tcp over udp");
935 VNET_DEFINE(int, tcp_udp_tunneling_overhead) = TCP_TUNNELING_OVERHEAD_DEFAULT;
938 sysctl_net_inet_tcp_udp_tunneling_overhead_check(SYSCTL_HANDLER_ARGS)
942 new = V_tcp_udp_tunneling_overhead;
943 error = sysctl_handle_int(oidp, &new, 0, req);
944 if (error == 0 && req->newptr) {
945 if ((new < TCP_TUNNELING_OVERHEAD_MIN) ||
946 (new > TCP_TUNNELING_OVERHEAD_MAX))
949 V_tcp_udp_tunneling_overhead = new;
954 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, udp_tunneling_overhead,
955 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
956 &VNET_NAME(tcp_udp_tunneling_overhead),
957 0, &sysctl_net_inet_tcp_udp_tunneling_overhead_check, "IU",
958 "MSS reduction when using tcp over udp");
961 * Exports one (struct tcp_function_info) for each alias/name.
964 sysctl_net_inet_list_func_info(SYSCTL_HANDLER_ARGS)
967 struct tcp_function *f;
968 struct tcp_function_info tfi;
971 * We don't allow writes.
973 if (req->newptr != NULL)
977 * Wire the old buffer so we can directly copy the functions to
978 * user space without dropping the lock.
980 if (req->oldptr != NULL) {
981 error = sysctl_wire_old_buffer(req, 0);
987 * Walk the list and copy out matching entries. If INVARIANTS
988 * is compiled in, also walk the list to verify the length of
989 * the list matches what we have recorded.
991 rw_rlock(&tcp_function_lock);
995 if (req->oldptr == NULL) {
1000 TAILQ_FOREACH(f, &t_functions, tf_next) {
1004 if (req->oldptr != NULL) {
1005 bzero(&tfi, sizeof(tfi));
1006 tfi.tfi_refcnt = f->tf_fb->tfb_refcnt;
1007 tfi.tfi_id = f->tf_fb->tfb_id;
1008 (void)strlcpy(tfi.tfi_alias, f->tf_name,
1009 sizeof(tfi.tfi_alias));
1010 (void)strlcpy(tfi.tfi_name,
1011 f->tf_fb->tfb_tcp_block_name, sizeof(tfi.tfi_name));
1012 error = SYSCTL_OUT(req, &tfi, sizeof(tfi));
1014 * Don't stop on error, as that is the
1015 * mechanism we use to accumulate length
1016 * information if the buffer was too short.
1020 KASSERT(cnt == tcp_fb_cnt,
1021 ("%s: cnt (%d) != tcp_fb_cnt (%d)", __func__, cnt, tcp_fb_cnt));
1025 rw_runlock(&tcp_function_lock);
1026 if (req->oldptr == NULL)
1027 error = SYSCTL_OUT(req, NULL,
1028 (cnt + 1) * sizeof(struct tcp_function_info));
1033 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, function_info,
1034 CTLTYPE_OPAQUE | CTLFLAG_SKIP | CTLFLAG_RD | CTLFLAG_MPSAFE,
1035 NULL, 0, sysctl_net_inet_list_func_info, "S,tcp_function_info",
1036 "List TCP function block name-to-ID mappings");
1039 * tfb_tcp_handoff_ok() function for the default stack.
1040 * Note that we'll basically try to take all comers.
1043 tcp_default_handoff_ok(struct tcpcb *tp)
1050 * tfb_tcp_fb_init() function for the default stack.
1052 * This handles making sure we have appropriate timers set if you are
1053 * transitioning a socket that has some amount of setup done.
1055 * The init() fuction from the default can *never* return non-zero i.e.
1056 * it is required to always succeed since it is the stack of last resort!
1059 tcp_default_fb_init(struct tcpcb *tp, void **ptr)
1061 struct socket *so = tptosocket(tp);
1064 INP_WLOCK_ASSERT(tptoinpcb(tp));
1065 /* We don't use the pointer */
1068 KASSERT(tp->t_state >= 0 && tp->t_state < TCPS_TIME_WAIT,
1069 ("%s: connection %p in unexpected state %d", __func__, tp,
1072 /* Make sure we get no interesting mbuf queuing behavior */
1073 /* All mbuf queue/ack compress flags should be off */
1074 tcp_lro_features_off(tp);
1076 /* Cancel the GP measurement in progress */
1077 tp->t_flags &= ~TF_GPUTINPROG;
1078 /* Validate the timers are not in usec, if they are convert */
1079 tcp_change_time_units(tp, TCP_TMR_GRANULARITY_TICKS);
1080 if ((tp->t_state == TCPS_SYN_SENT) ||
1081 (tp->t_state == TCPS_SYN_RECEIVED))
1082 rexmt = tcp_rexmit_initial * tcp_backoff[tp->t_rxtshift];
1084 rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
1085 if (tp->t_rxtshift == 0)
1086 tp->t_rxtcur = rexmt;
1088 TCPT_RANGESET(tp->t_rxtcur, rexmt, tp->t_rttmin, TCPTV_REXMTMAX);
1091 * Nothing to do for ESTABLISHED or LISTEN states. And, we don't
1092 * know what to do for unexpected states (which includes TIME_WAIT).
1094 if (tp->t_state <= TCPS_LISTEN || tp->t_state >= TCPS_TIME_WAIT)
1098 * Make sure some kind of transmission timer is set if there is
1101 if ((!TCPS_HAVEESTABLISHED(tp->t_state) || sbavail(&so->so_snd) ||
1102 tp->snd_una != tp->snd_max) && !(tcp_timer_active(tp, TT_REXMT) ||
1103 tcp_timer_active(tp, TT_PERSIST))) {
1105 * If the session has established and it looks like it should
1106 * be in the persist state, set the persist timer. Otherwise,
1107 * set the retransmit timer.
1109 if (TCPS_HAVEESTABLISHED(tp->t_state) && tp->snd_wnd == 0 &&
1110 (int32_t)(tp->snd_nxt - tp->snd_una) <
1111 (int32_t)sbavail(&so->so_snd))
1114 tcp_timer_activate(tp, TT_REXMT, TP_RXTCUR(tp));
1117 /* All non-embryonic sessions get a keepalive timer. */
1118 if (!tcp_timer_active(tp, TT_KEEP))
1119 tcp_timer_activate(tp, TT_KEEP,
1120 TCPS_HAVEESTABLISHED(tp->t_state) ? TP_KEEPIDLE(tp) :
1124 * Make sure critical variables are initialized
1125 * if transitioning while in Recovery.
1127 if IN_FASTRECOVERY(tp->t_flags) {
1128 if (tp->sackhint.recover_fs == 0)
1129 tp->sackhint.recover_fs = max(1,
1130 tp->snd_nxt - tp->snd_una);
1137 * tfb_tcp_fb_fini() function for the default stack.
1139 * This changes state as necessary (or prudent) to prepare for another stack
1140 * to assume responsibility for the connection.
1143 tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged)
1146 INP_WLOCK_ASSERT(tptoinpcb(tp));
1149 tcp_log_flowend(tp);
1156 * Target size of TCP PCB hash tables. Must be a power of two.
1158 * Note that this can be overridden by the kernel environment
1159 * variable net.inet.tcp.tcbhashsize
1162 #define TCBHASHSIZE 0
1165 MALLOC_DEFINE(M_TCPLOG, "tcplog", "TCP address and flags print buffers");
1166 MALLOC_DEFINE(M_TCPFUNCTIONS, "tcpfunc", "TCP function set memory");
1168 static struct mtx isn_mtx;
1170 #define ISN_LOCK_INIT() mtx_init(&isn_mtx, "isn_mtx", NULL, MTX_DEF)
1171 #define ISN_LOCK() mtx_lock(&isn_mtx)
1172 #define ISN_UNLOCK() mtx_unlock(&isn_mtx)
1174 INPCBSTORAGE_DEFINE(tcpcbstor, tcpcb, "tcpinp", "tcp_inpcb", "tcp", "tcphash");
1177 * Take a value and get the next power of 2 that doesn't overflow.
1178 * Used to size the tcp_inpcb hash buckets.
1181 maketcp_hashsize(int size)
1187 * get the next power of 2 higher than maxsockets.
1189 hashsize = 1 << fls(size);
1190 /* catch overflow, and just go one power of 2 smaller */
1191 if (hashsize < size) {
1192 hashsize = 1 << (fls(size) - 1);
1197 static volatile int next_tcp_stack_id = 1;
1200 * Register a TCP function block with the name provided in the names
1201 * array. (Note that this function does NOT automatically register
1202 * blk->tfb_tcp_block_name as a stack name. Therefore, you should
1203 * explicitly include blk->tfb_tcp_block_name in the list of names if
1204 * you wish to register the stack with that name.)
1206 * Either all name registrations will succeed or all will fail. If
1207 * a name registration fails, the function will update the num_names
1208 * argument to point to the array index of the name that encountered
1211 * Returns 0 on success, or an error code on failure.
1214 register_tcp_functions_as_names(struct tcp_function_block *blk, int wait,
1215 const char *names[], int *num_names)
1217 struct tcp_function *n;
1218 struct tcp_function_set fs;
1221 KASSERT(names != NULL && *num_names > 0,
1222 ("%s: Called with 0-length name list", __func__));
1223 KASSERT(names != NULL, ("%s: Called with NULL name list", __func__));
1224 KASSERT(rw_initialized(&tcp_function_lock),
1225 ("%s: called too early", __func__));
1227 if ((blk->tfb_tcp_output == NULL) ||
1228 (blk->tfb_tcp_do_segment == NULL) ||
1229 (blk->tfb_tcp_ctloutput == NULL) ||
1230 (strlen(blk->tfb_tcp_block_name) == 0)) {
1232 * These functions are required and you
1239 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1244 refcount_init(&blk->tfb_refcnt, 0);
1245 blk->tfb_id = atomic_fetchadd_int(&next_tcp_stack_id, 1);
1246 for (i = 0; i < *num_names; i++) {
1247 n = malloc(sizeof(struct tcp_function), M_TCPFUNCTIONS, wait);
1254 (void)strlcpy(fs.function_set_name, names[i],
1255 sizeof(fs.function_set_name));
1256 rw_wlock(&tcp_function_lock);
1257 if (find_tcp_functions_locked(&fs) != NULL) {
1258 /* Duplicate name space not allowed */
1259 rw_wunlock(&tcp_function_lock);
1260 free(n, M_TCPFUNCTIONS);
1264 (void)strlcpy(n->tf_name, names[i], sizeof(n->tf_name));
1265 TAILQ_INSERT_TAIL(&t_functions, n, tf_next);
1267 rw_wunlock(&tcp_function_lock);
1273 * Deregister the names we just added. Because registration failed
1274 * for names[i], we don't need to deregister that name.
1277 rw_wlock(&tcp_function_lock);
1279 TAILQ_FOREACH(n, &t_functions, tf_next) {
1280 if (!strncmp(n->tf_name, names[i],
1281 TCP_FUNCTION_NAME_LEN_MAX)) {
1282 TAILQ_REMOVE(&t_functions, n, tf_next);
1285 free(n, M_TCPFUNCTIONS);
1290 rw_wunlock(&tcp_function_lock);
1295 * Register a TCP function block using the name provided in the name
1298 * Returns 0 on success, or an error code on failure.
1301 register_tcp_functions_as_name(struct tcp_function_block *blk, const char *name,
1304 const char *name_list[1];
1309 name_list[0] = name;
1311 name_list[0] = blk->tfb_tcp_block_name;
1312 rv = register_tcp_functions_as_names(blk, wait, name_list, &num_names);
1317 * Register a TCP function block using the name defined in
1318 * blk->tfb_tcp_block_name.
1320 * Returns 0 on success, or an error code on failure.
1323 register_tcp_functions(struct tcp_function_block *blk, int wait)
1326 return (register_tcp_functions_as_name(blk, NULL, wait));
1330 * Deregister all names associated with a function block. This
1331 * functionally removes the function block from use within the system.
1333 * When called with a true quiesce argument, mark the function block
1334 * as being removed so no more stacks will use it and determine
1335 * whether the removal would succeed.
1337 * When called with a false quiesce argument, actually attempt the
1340 * When called with a force argument, attempt to switch all TCBs to
1341 * use the default stack instead of returning EBUSY.
1343 * Returns 0 on success (or if the removal would succeed), or an error
1347 deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce,
1350 struct tcp_function *f;
1351 VNET_ITERATOR_DECL(vnet_iter);
1353 if (blk == &tcp_def_funcblk) {
1354 /* You can't un-register the default */
1357 rw_wlock(&tcp_function_lock);
1358 VNET_LIST_RLOCK_NOSLEEP();
1359 VNET_FOREACH(vnet_iter) {
1360 CURVNET_SET(vnet_iter);
1361 if (blk == V_tcp_func_set_ptr) {
1362 /* You can't free the current default in some vnet. */
1364 VNET_LIST_RUNLOCK_NOSLEEP();
1365 rw_wunlock(&tcp_function_lock);
1370 VNET_LIST_RUNLOCK_NOSLEEP();
1371 /* Mark the block so no more stacks can use it. */
1372 blk->tfb_flags |= TCP_FUNC_BEING_REMOVED;
1374 * If TCBs are still attached to the stack, attempt to switch them
1375 * to the default stack.
1377 if (force && blk->tfb_refcnt) {
1380 VNET_ITERATOR_DECL(vnet_iter);
1382 rw_wunlock(&tcp_function_lock);
1385 VNET_FOREACH(vnet_iter) {
1386 CURVNET_SET(vnet_iter);
1387 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_tcbinfo,
1388 INPLOOKUP_WLOCKPCB);
1390 while ((inp = inp_next(&inpi)) != NULL) {
1391 tp = intotcpcb(inp);
1392 if (tp == NULL || tp->t_fb != blk)
1394 tcp_switch_back_to_default(tp);
1398 VNET_LIST_RUNLOCK();
1400 rw_wlock(&tcp_function_lock);
1402 if (blk->tfb_refcnt) {
1403 /* TCBs still attached. */
1404 rw_wunlock(&tcp_function_lock);
1409 rw_wunlock(&tcp_function_lock);
1412 /* Remove any function names that map to this function block. */
1413 while (find_tcp_fb_locked(blk, &f) != NULL) {
1414 TAILQ_REMOVE(&t_functions, f, tf_next);
1417 free(f, M_TCPFUNCTIONS);
1419 rw_wunlock(&tcp_function_lock);
1426 struct epoch_tracker et;
1427 VNET_ITERATOR_DECL(vnet_iter);
1432 NET_EPOCH_ENTER(et);
1433 VNET_LIST_RLOCK_NOSLEEP();
1434 VNET_FOREACH(vnet_iter) {
1435 CURVNET_SET(vnet_iter);
1436 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_tcbinfo,
1437 INPLOOKUP_WLOCKPCB);
1442 * Walk the tcpbs, if existing, and flush the reassembly queue,
1443 * if there is one...
1444 * XXX: The "Net/3" implementation doesn't imply that the TCP
1445 * reassembly queue should be flushed, but in a situation
1446 * where we're really low on mbufs, this is potentially
1449 while ((inpb = inp_next(&inpi)) != NULL) {
1450 if ((tcpb = intotcpcb(inpb)) != NULL) {
1451 tcp_reass_flush(tcpb);
1452 tcp_clean_sackreport(tcpb);
1454 tcp_log_drain(tcpb);
1457 if (tcp_pcap_aggressive_free) {
1458 /* Free the TCP PCAP queues. */
1459 tcp_pcap_drain(&(tcpb->t_inpkts));
1460 tcp_pcap_drain(&(tcpb->t_outpkts));
1467 VNET_LIST_RUNLOCK_NOSLEEP();
1472 tcp_vnet_init(void *arg __unused)
1476 if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN,
1477 &V_tcp_hhh[HHOOK_TCP_EST_IN], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
1478 printf("%s: WARNING: unable to register helper hook\n", __func__);
1479 if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT,
1480 &V_tcp_hhh[HHOOK_TCP_EST_OUT], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
1481 printf("%s: WARNING: unable to register helper hook\n", __func__);
1484 if (tcp_stats_init())
1485 printf("%s: WARNING: unable to initialise TCP stats\n",
1488 in_pcbinfo_init(&V_tcbinfo, &tcpcbstor, tcp_tcbhashsize,
1494 TUNABLE_INT_FETCH("net.inet.tcp.sack.enable", &V_tcp_do_sack);
1495 V_sack_hole_zone = uma_zcreate("sackhole", sizeof(struct sackhole),
1496 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
1498 tcp_fastopen_init();
1500 COUNTER_ARRAY_ALLOC(V_tcps_states, TCP_NSTATES, M_WAITOK);
1501 VNET_PCPUSTAT_ALLOC(tcpstat, M_WAITOK);
1503 V_tcp_msl = TCPTV_MSL;
1505 VNET_SYSINIT(tcp_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH,
1506 tcp_vnet_init, NULL);
1509 tcp_init(void *arg __unused)
1511 const char *tcbhash_tuneable;
1514 tcp_reass_global_init();
1516 /* XXX virtualize those below? */
1517 tcp_delacktime = TCPTV_DELACK;
1518 tcp_keepinit = TCPTV_KEEP_INIT;
1519 tcp_keepidle = TCPTV_KEEP_IDLE;
1520 tcp_keepintvl = TCPTV_KEEPINTVL;
1521 tcp_maxpersistidle = TCPTV_KEEP_IDLE;
1522 tcp_rexmit_initial = TCPTV_RTOBASE;
1523 if (tcp_rexmit_initial < 1)
1524 tcp_rexmit_initial = 1;
1525 tcp_rexmit_min = TCPTV_MIN;
1526 if (tcp_rexmit_min < 1)
1528 tcp_persmin = TCPTV_PERSMIN;
1529 tcp_persmax = TCPTV_PERSMAX;
1530 tcp_rexmit_slop = TCPTV_CPU_VAR;
1531 tcp_finwait2_timeout = TCPTV_FINWAIT2_TIMEOUT;
1533 /* Setup the tcp function block list */
1534 TAILQ_INIT(&t_functions);
1535 rw_init(&tcp_function_lock, "tcp_func_lock");
1536 register_tcp_functions(&tcp_def_funcblk, M_WAITOK);
1537 sx_init(&tcpoudp_lock, "TCP over UDP configuration");
1539 /* Initialize the TCP logging data. */
1542 arc4rand(&V_ts_offset_secret, sizeof(V_ts_offset_secret), 0);
1544 if (tcp_soreceive_stream) {
1546 tcp_protosw.pr_soreceive = soreceive_stream;
1549 tcp6_protosw.pr_soreceive = soreceive_stream;
1554 max_protohdr_grow(sizeof(struct ip6_hdr) + sizeof(struct tcphdr));
1556 max_protohdr_grow(sizeof(struct tcpiphdr));
1560 EVENTHANDLER_REGISTER(shutdown_pre_sync, tcp_fini, NULL,
1561 SHUTDOWN_PRI_DEFAULT);
1562 EVENTHANDLER_REGISTER(vm_lowmem, tcp_drain, NULL, LOWMEM_PRI_DEFAULT);
1563 EVENTHANDLER_REGISTER(mbuf_lowmem, tcp_drain, NULL, LOWMEM_PRI_DEFAULT);
1565 tcp_inp_lro_direct_queue = counter_u64_alloc(M_WAITOK);
1566 tcp_inp_lro_wokeup_queue = counter_u64_alloc(M_WAITOK);
1567 tcp_inp_lro_compressed = counter_u64_alloc(M_WAITOK);
1568 tcp_inp_lro_locks_taken = counter_u64_alloc(M_WAITOK);
1569 tcp_extra_mbuf = counter_u64_alloc(M_WAITOK);
1570 tcp_would_have_but = counter_u64_alloc(M_WAITOK);
1571 tcp_comp_total = counter_u64_alloc(M_WAITOK);
1572 tcp_uncomp_total = counter_u64_alloc(M_WAITOK);
1573 tcp_bad_csums = counter_u64_alloc(M_WAITOK);
1574 tcp_pacing_failures = counter_u64_alloc(M_WAITOK);
1579 hashsize = TCBHASHSIZE;
1580 tcbhash_tuneable = "net.inet.tcp.tcbhashsize";
1581 TUNABLE_INT_FETCH(tcbhash_tuneable, &hashsize);
1582 if (hashsize == 0) {
1584 * Auto tune the hash size based on maxsockets.
1585 * A perfect hash would have a 1:1 mapping
1586 * (hashsize = maxsockets) however it's been
1587 * suggested that O(2) average is better.
1589 hashsize = maketcp_hashsize(maxsockets / 4);
1591 * Our historical default is 512,
1592 * do not autotune lower than this.
1597 printf("%s: %s auto tuned to %d\n", __func__,
1598 tcbhash_tuneable, hashsize);
1601 * We require a hashsize to be a power of two.
1602 * Previously if it was not a power of two we would just reset it
1603 * back to 512, which could be a nasty surprise if you did not notice
1604 * the error message.
1605 * Instead what we do is clip it to the closest power of two lower
1606 * than the specified hash value.
1608 if (!powerof2(hashsize)) {
1609 int oldhashsize = hashsize;
1611 hashsize = maketcp_hashsize(hashsize);
1612 /* prevent absurdly low value */
1615 printf("%s: WARNING: TCB hash size not a power of 2, "
1616 "clipped from %d to %d.\n", __func__, oldhashsize,
1619 tcp_tcbhashsize = hashsize;
1622 IPPROTO_REGISTER(IPPROTO_TCP, tcp_input, tcp_ctlinput);
1625 IP6PROTO_REGISTER(IPPROTO_TCP, tcp6_input, tcp6_ctlinput);
1628 SYSINIT(tcp_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, tcp_init, NULL);
1632 tcp_destroy(void *unused __unused)
1640 * All our processes are gone, all our sockets should be cleaned
1641 * up, which means, we should be past the tcp_discardcb() calls.
1642 * Sleep to let all tcpcb timers really disappear and cleanup.
1645 INP_INFO_WLOCK(&V_tcbinfo);
1646 n = V_tcbinfo.ipi_count;
1647 INP_INFO_WUNLOCK(&V_tcbinfo);
1650 pause("tcpdes", hz / 10);
1654 in_pcbinfo_destroy(&V_tcbinfo);
1655 /* tcp_discardcb() clears the sack_holes up. */
1656 uma_zdestroy(V_sack_hole_zone);
1659 * Cannot free the zone until all tcpcbs are released as we attach
1660 * the allocations to them.
1662 tcp_fastopen_destroy();
1664 COUNTER_ARRAY_FREE(V_tcps_states, TCP_NSTATES);
1665 VNET_PCPUSTAT_FREE(tcpstat);
1668 error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_IN]);
1670 printf("%s: WARNING: unable to deregister helper hook "
1671 "type=%d, id=%d: error %d returned\n", __func__,
1672 HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN, error);
1674 error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_OUT]);
1676 printf("%s: WARNING: unable to deregister helper hook "
1677 "type=%d, id=%d: error %d returned\n", __func__,
1678 HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT, error);
1682 VNET_SYSUNINIT(tcp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, tcp_destroy, NULL);
1692 * Fill in the IP and TCP headers for an outgoing packet, given the tcpcb.
1693 * tcp_template used to store this data in mbufs, but we now recopy it out
1694 * of the tcpcb each time to conserve mbufs.
1697 tcpip_fillheaders(struct inpcb *inp, uint16_t port, void *ip_ptr, void *tcp_ptr)
1699 struct tcphdr *th = (struct tcphdr *)tcp_ptr;
1701 INP_WLOCK_ASSERT(inp);
1704 if ((inp->inp_vflag & INP_IPV6) != 0) {
1705 struct ip6_hdr *ip6;
1707 ip6 = (struct ip6_hdr *)ip_ptr;
1708 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
1709 (inp->inp_flow & IPV6_FLOWINFO_MASK);
1710 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
1711 (IPV6_VERSION & IPV6_VERSION_MASK);
1713 ip6->ip6_nxt = IPPROTO_TCP;
1715 ip6->ip6_nxt = IPPROTO_UDP;
1716 ip6->ip6_plen = htons(sizeof(struct tcphdr));
1717 ip6->ip6_src = inp->in6p_laddr;
1718 ip6->ip6_dst = inp->in6p_faddr;
1721 #if defined(INET6) && defined(INET)
1728 ip = (struct ip *)ip_ptr;
1729 ip->ip_v = IPVERSION;
1731 ip->ip_tos = inp->inp_ip_tos;
1735 ip->ip_ttl = inp->inp_ip_ttl;
1738 ip->ip_p = IPPROTO_TCP;
1740 ip->ip_p = IPPROTO_UDP;
1741 ip->ip_src = inp->inp_laddr;
1742 ip->ip_dst = inp->inp_faddr;
1745 th->th_sport = inp->inp_lport;
1746 th->th_dport = inp->inp_fport;
1750 tcp_set_flags(th, 0);
1753 th->th_sum = 0; /* in_pseudo() is called later for ipv4 */
1757 * Create template to be used to send tcp packets on a connection.
1758 * Allocates an mbuf and fills in a skeletal tcp/ip header. The only
1759 * use for this function is in keepalives, which use tcp_respond.
1762 tcpip_maketemplate(struct inpcb *inp)
1766 t = malloc(sizeof(*t), M_TEMP, M_NOWAIT);
1769 tcpip_fillheaders(inp, 0, (void *)&t->tt_ipgen, (void *)&t->tt_t);
1774 * Send a single message to the TCP at address specified by
1775 * the given TCP/IP header. If m == NULL, then we make a copy
1776 * of the tcpiphdr at th and send directly to the addressed host.
1777 * This is used to force keep alive messages out using the TCP
1778 * template for a connection. If flags are given then we send
1779 * a message back to the TCP which originated the segment th,
1780 * and discard the mbuf containing it and any other attached mbufs.
1782 * In any case the ack and sequence number of the transmitted
1783 * segment are as specified by the parameters.
1785 * NOTE: If m != NULL, then th must point to *inside* the mbuf.
1788 tcp_respond(struct tcpcb *tp, void *ipgen, struct tcphdr *th, struct mbuf *m,
1789 tcp_seq ack, tcp_seq seq, uint16_t flags)
1795 struct udphdr *uh = NULL;
1797 struct tcp_log_buffer *lgb;
1800 struct ip6_hdr *ip6;
1803 int optlen, tlen, win, ulen;
1809 int thflags = tcp_get_flags(th);
1812 KASSERT(tp != NULL || m != NULL, ("tcp_respond: tp and m both NULL"));
1816 isipv6 = ((struct ip *)ipgen)->ip_v == (IPV6_VERSION >> 4);
1822 inp = tptoinpcb(tp);
1823 INP_LOCK_ASSERT(inp);
1829 if (isipv6 && ip6 && (ip6->ip6_nxt == IPPROTO_UDP))
1830 port = m->m_pkthdr.tcp_tun_port;
1833 if (ip && (ip->ip_p == IPPROTO_UDP))
1834 port = m->m_pkthdr.tcp_tun_port;
1843 if (!(flags & TH_RST)) {
1844 win = sbspace(&inp->inp_socket->so_rcv);
1845 if (win > TCP_MAXWIN << tp->rcv_scale)
1846 win = TCP_MAXWIN << tp->rcv_scale;
1848 if ((tp->t_flags & TF_NOOPT) == 0)
1852 m = m_gethdr(M_NOWAIT, MT_DATA);
1855 m->m_data += max_linkhdr;
1858 bcopy((caddr_t)ip6, mtod(m, caddr_t),
1859 sizeof(struct ip6_hdr));
1860 ip6 = mtod(m, struct ip6_hdr *);
1861 nth = (struct tcphdr *)(ip6 + 1);
1863 /* Insert a UDP header */
1864 uh = (struct udphdr *)nth;
1865 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1866 uh->uh_dport = port;
1867 nth = (struct tcphdr *)(uh + 1);
1872 bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
1873 ip = mtod(m, struct ip *);
1874 nth = (struct tcphdr *)(ip + 1);
1876 /* Insert a UDP header */
1877 uh = (struct udphdr *)nth;
1878 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1879 uh->uh_dport = port;
1880 nth = (struct tcphdr *)(uh + 1);
1883 bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
1885 } else if ((!M_WRITABLE(m)) || (port != 0)) {
1888 /* Can't reuse 'm', allocate a new mbuf. */
1889 n = m_gethdr(M_NOWAIT, MT_DATA);
1895 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
1901 n->m_data += max_linkhdr;
1902 /* m_len is set later */
1903 #define xchg(a,b,type) { type t; t=a; a=b; b=t; }
1906 bcopy((caddr_t)ip6, mtod(n, caddr_t),
1907 sizeof(struct ip6_hdr));
1908 ip6 = mtod(n, struct ip6_hdr *);
1909 xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
1910 nth = (struct tcphdr *)(ip6 + 1);
1912 /* Insert a UDP header */
1913 uh = (struct udphdr *)nth;
1914 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1915 uh->uh_dport = port;
1916 nth = (struct tcphdr *)(uh + 1);
1921 bcopy((caddr_t)ip, mtod(n, caddr_t), sizeof(struct ip));
1922 ip = mtod(n, struct ip *);
1923 xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t);
1924 nth = (struct tcphdr *)(ip + 1);
1926 /* Insert a UDP header */
1927 uh = (struct udphdr *)nth;
1928 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1929 uh->uh_dport = port;
1930 nth = (struct tcphdr *)(uh + 1);
1933 bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
1934 xchg(nth->th_dport, nth->th_sport, uint16_t);
1941 * XXX MRT We inherit the FIB, which is lucky.
1945 m->m_data = (caddr_t)ipgen;
1946 /* clear any receive flags for proper bpf timestamping */
1947 m->m_flags &= ~(M_TSTMP | M_TSTMP_LRO);
1948 /* m_len is set later */
1951 xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
1952 nth = (struct tcphdr *)(ip6 + 1);
1956 xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t);
1957 nth = (struct tcphdr *)(ip + 1);
1961 * this is usually a case when an extension header
1962 * exists between the IPv6 header and the
1965 nth->th_sport = th->th_sport;
1966 nth->th_dport = th->th_dport;
1968 xchg(nth->th_dport, nth->th_sport, uint16_t);
1974 tlen = sizeof (struct ip6_hdr) + sizeof (struct tcphdr);
1976 #if defined(INET) && defined(INET6)
1980 tlen = sizeof (struct tcpiphdr);
1983 tlen += sizeof (struct udphdr);
1986 KASSERT(M_TRAILINGSPACE(m) >= tlen,
1987 ("Not enough trailing space for message (m=%p, need=%d, have=%ld)",
1988 m, tlen, (long)M_TRAILINGSPACE(m)));
1993 ect = tcp_ecn_output_established(tp, &flags, 0, false);
1994 /* Make sure we have room. */
1995 if (M_TRAILINGSPACE(m) < TCP_MAXOLEN) {
1996 m->m_next = m_get(M_NOWAIT, MT_DATA);
1998 optp = mtod(m->m_next, u_char *);
2003 optp = (u_char *) (nth + 1);
2009 if (tp->t_flags & TF_RCVD_TSTMP) {
2010 to.to_tsval = tcp_ts_getticks() + tp->ts_offset;
2011 to.to_tsecr = tp->ts_recent;
2012 to.to_flags |= TOF_TS;
2014 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2015 /* TCP-MD5 (RFC2385). */
2016 if (tp->t_flags & TF_SIGNATURE)
2017 to.to_flags |= TOF_SIGNATURE;
2019 /* Add the options. */
2020 tlen += optlen = tcp_addoptions(&to, optp);
2022 /* Update m_len in the correct mbuf. */
2023 optm->m_len += optlen;
2029 ulen = tlen - sizeof(struct ip6_hdr);
2030 uh->uh_ulen = htons(ulen);
2032 ip6->ip6_flow = htonl(ect << IPV6_FLOWLABEL_LEN);
2033 ip6->ip6_vfc = IPV6_VERSION;
2035 ip6->ip6_nxt = IPPROTO_UDP;
2037 ip6->ip6_nxt = IPPROTO_TCP;
2038 ip6->ip6_plen = htons(tlen - sizeof(*ip6));
2041 #if defined(INET) && defined(INET6)
2047 ulen = tlen - sizeof(struct ip);
2048 uh->uh_ulen = htons(ulen);
2050 ip->ip_len = htons(tlen);
2052 ip->ip_tos = inp->inp_ip_tos & ~IPTOS_ECN_MASK;
2053 ip->ip_ttl = inp->inp_ip_ttl;
2056 ip->ip_ttl = V_ip_defttl;
2060 ip->ip_p = IPPROTO_UDP;
2062 ip->ip_p = IPPROTO_TCP;
2064 if (V_path_mtu_discovery)
2065 ip->ip_off |= htons(IP_DF);
2068 m->m_pkthdr.len = tlen;
2069 m->m_pkthdr.rcvif = NULL;
2073 * Packet is associated with a socket, so allow the
2074 * label of the response to reflect the socket label.
2076 INP_LOCK_ASSERT(inp);
2077 mac_inpcb_create_mbuf(inp, m);
2080 * Packet is not associated with a socket, so possibly
2081 * update the label in place.
2083 mac_netinet_tcp_reply(m);
2086 nth->th_seq = htonl(seq);
2087 nth->th_ack = htonl(ack);
2088 nth->th_off = (sizeof (struct tcphdr) + optlen) >> 2;
2089 tcp_set_flags(nth, flags);
2090 if (tp && (flags & TH_RST)) {
2092 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
2095 nth->th_win = htons((u_short) (win >> tp->rcv_scale));
2097 nth->th_win = htons((u_short)win);
2100 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2101 if (to.to_flags & TOF_SIGNATURE) {
2102 if (!TCPMD5_ENABLED() ||
2103 TCPMD5_OUTPUT(m, nth, to.to_signature) != 0) {
2113 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
2114 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
2115 uh->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0);
2118 m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
2119 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
2120 nth->th_sum = in6_cksum_pseudo(ip6,
2121 tlen - sizeof(struct ip6_hdr), IPPROTO_TCP, 0);
2123 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
2126 #if defined(INET6) && defined(INET)
2132 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
2133 htons(ulen + IPPROTO_UDP));
2134 m->m_pkthdr.csum_flags = CSUM_UDP;
2135 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
2138 m->m_pkthdr.csum_flags = CSUM_TCP;
2139 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
2140 nth->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
2141 htons((u_short)(tlen - sizeof(struct ip) + ip->ip_p)));
2145 TCP_PROBE3(debug__output, tp, th, m);
2147 TCP_PROBE5(accept__refused, NULL, NULL, m, tp, nth);
2149 if ((tp != NULL) && tcp_bblogging_on(tp)) {
2150 if (INP_WLOCKED(inp)) {
2151 union tcp_log_stackspecific log;
2154 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2155 log.u_bbr.inhpts = tcp_in_hpts(tp);
2156 log.u_bbr.flex8 = 4;
2157 log.u_bbr.pkts_out = tp->t_maxseg;
2158 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2159 log.u_bbr.delivered = 0;
2160 lgb = tcp_log_event(tp, nth, NULL, NULL, TCP_LOG_OUT,
2161 ERRNO_UNK, 0, &log, false, NULL, NULL, 0, &tv);
2164 * We can not log the packet, since we only own the
2165 * read lock, but a write lock is needed. The read lock
2166 * is not upgraded to a write lock, since only getting
2167 * the read lock was done intentionally to improve the
2168 * handling of SYN flooding attacks.
2169 * This happens only for pure SYN segments received in
2170 * the initial CLOSED state, or received in a more
2171 * advanced state than listen and the UDP encapsulation
2172 * port is unexpected.
2173 * The incoming SYN segments do not really belong to
2174 * the TCP connection and the handling does not change
2175 * the state of the TCP connection. Therefore, the
2176 * sending of the RST segments is not logged. Please
2177 * note that also the incoming SYN segments are not
2180 * The following code ensures that the above description
2181 * is and stays correct.
2183 KASSERT((thflags & (TH_ACK|TH_SYN)) == TH_SYN &&
2184 (tp->t_state == TCPS_CLOSED ||
2185 (tp->t_state > TCPS_LISTEN && tp->t_port != port)),
2186 ("%s: Logging of TCP segment with flags 0x%b and "
2187 "UDP encapsulation port %u skipped in state %s",
2188 __func__, thflags, PRINT_TH_FLAGS,
2189 ntohs(port), tcpstates[tp->t_state]));
2194 TCPSTAT_INC(tcps_sndacks);
2195 else if (flags & (TH_SYN|TH_FIN|TH_RST))
2196 TCPSTAT_INC(tcps_sndctrl);
2197 TCPSTAT_INC(tcps_sndtotal);
2201 TCP_PROBE5(send, NULL, tp, ip6, tp, nth);
2202 output_ret = ip6_output(m, inp ? inp->in6p_outputopts : NULL,
2203 NULL, 0, NULL, NULL, inp);
2206 #if defined(INET) && defined(INET6)
2211 TCP_PROBE5(send, NULL, tp, ip, tp, nth);
2212 output_ret = ip_output(m, NULL, NULL, 0, NULL, inp);
2216 lgb->tlb_errno = output_ret;
2220 * Create a new TCP control block, making an empty reassembly queue and hooking
2221 * it to the argument protocol control block. The `inp' parameter must have
2222 * come from the zone allocator set up by tcpcbstor declaration.
2225 tcp_newtcpcb(struct inpcb *inp)
2227 struct tcpcb *tp = intotcpcb(inp);
2229 int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
2233 * Historically allocation was done with M_ZERO. There is a lot of
2234 * code that rely on that. For now take safe approach and zero whole
2235 * tcpcb. This definitely can be optimized.
2237 bzero(&tp->t_start_zero, t_zero_size);
2239 /* Initialise cc_var struct for this tcpcb. */
2240 tp->t_ccv.type = IPPROTO_TCP;
2241 tp->t_ccv.ccvc.tcp = tp;
2242 rw_rlock(&tcp_function_lock);
2243 tp->t_fb = V_tcp_func_set_ptr;
2244 refcount_acquire(&tp->t_fb->tfb_refcnt);
2245 rw_runlock(&tcp_function_lock);
2247 * Use the current system default CC algorithm.
2249 cc_attach(tp, CC_DEFAULT_ALGO());
2251 if (CC_ALGO(tp)->cb_init != NULL)
2252 if (CC_ALGO(tp)->cb_init(&tp->t_ccv, NULL) > 0) {
2254 if (tp->t_fb->tfb_tcp_fb_fini)
2255 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
2256 refcount_release(&tp->t_fb->tfb_refcnt);
2261 if (khelp_init_osd(HELPER_CLASS_TCP, &tp->t_osd)) {
2262 if (tp->t_fb->tfb_tcp_fb_fini)
2263 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
2264 refcount_release(&tp->t_fb->tfb_refcnt);
2269 TAILQ_INIT(&tp->t_segq);
2270 STAILQ_INIT(&tp->t_inqueue);
2273 isipv6 ? V_tcp_v6mssdflt :
2277 /* All mbuf queue/ack compress flags should be off */
2278 tcp_lro_features_off(tp);
2280 callout_init_rw(&tp->t_callout, &inp->inp_lock, CALLOUT_RETURNUNLOCKED);
2281 for (int i = 0; i < TT_N; i++)
2282 tp->t_timers[i] = SBT_MAX;
2284 switch (V_tcp_do_rfc1323) {
2289 tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP);
2292 tp->t_flags = TF_REQ_SCALE;
2295 tp->t_flags = TF_REQ_TSTMP;
2299 tp->t_flags |= TF_SACK_PERMIT;
2300 TAILQ_INIT(&tp->snd_holes);
2303 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
2304 * rtt estimate. Set rttvar so that srtt + 4 * rttvar gives
2305 * reasonable initial retransmit time.
2307 tp->t_srtt = TCPTV_SRTTBASE;
2308 tp->t_rttvar = ((tcp_rexmit_initial - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4;
2309 tp->t_rttmin = tcp_rexmit_min;
2310 tp->t_rxtcur = tcp_rexmit_initial;
2311 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
2312 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
2313 tp->t_rcvtime = ticks;
2314 /* We always start with ticks granularity */
2315 tp->t_tmr_granularity = TCP_TMR_GRANULARITY_TICKS;
2317 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
2318 * because the socket may be bound to an IPv6 wildcard address,
2319 * which may match an IPv4-mapped IPv6 address.
2321 inp->inp_ip_ttl = V_ip_defttl;
2327 * Init the TCP PCAP queues.
2329 tcp_pcap_tcpcb_init(tp);
2332 /* Initialize the per-TCPCB log data. */
2333 tcp_log_tcpcbinit(tp);
2335 tp->t_pacing_rate = -1;
2336 if (tp->t_fb->tfb_tcp_fb_init) {
2337 if ((*tp->t_fb->tfb_tcp_fb_init)(tp, &tp->t_fb_ptr)) {
2338 refcount_release(&tp->t_fb->tfb_refcnt);
2343 if (V_tcp_perconn_stats_enable == 1)
2344 tp->t_stats = stats_blob_alloc(V_tcp_perconn_stats_dflt_tpl, 0);
2347 tp->t_flags |= TF_LRD;
2353 * Drop a TCP connection, reporting
2354 * the specified error. If connection is synchronized,
2355 * then send a RST to peer.
2358 tcp_drop(struct tcpcb *tp, int errno)
2360 struct socket *so = tptosocket(tp);
2363 INP_WLOCK_ASSERT(tptoinpcb(tp));
2365 if (TCPS_HAVERCVDSYN(tp->t_state)) {
2366 tcp_state_change(tp, TCPS_CLOSED);
2367 /* Don't use tcp_output() here due to possible recursion. */
2368 (void)tcp_output_nodrop(tp);
2369 TCPSTAT_INC(tcps_drops);
2371 TCPSTAT_INC(tcps_conndrops);
2372 if (errno == ETIMEDOUT && tp->t_softerror)
2373 errno = tp->t_softerror;
2374 so->so_error = errno;
2375 return (tcp_close(tp));
2379 tcp_discardcb(struct tcpcb *tp)
2381 struct inpcb *inp = tptoinpcb(tp);
2382 struct socket *so = tptosocket(tp);
2385 bool isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
2388 INP_WLOCK_ASSERT(inp);
2391 if (tp->t_fb->tfb_tcp_timer_stop_all) {
2392 tp->t_fb->tfb_tcp_timer_stop_all(tp);
2395 /* free the reassembly queue, if any */
2396 tcp_reass_flush(tp);
2399 /* Disconnect offload device, if any. */
2400 if (tp->t_flags & TF_TOE)
2401 tcp_offload_detach(tp);
2404 tcp_free_sackholes(tp);
2407 /* Free the TCP PCAP queues. */
2408 tcp_pcap_drain(&(tp->t_inpkts));
2409 tcp_pcap_drain(&(tp->t_outpkts));
2412 /* Allow the CC algorithm to clean up after itself. */
2413 if (CC_ALGO(tp)->cb_destroy != NULL)
2414 CC_ALGO(tp)->cb_destroy(&tp->t_ccv);
2416 /* Detach from the CC algorithm */
2420 khelp_destroy_osd(&tp->t_osd);
2423 stats_blob_destroy(tp->t_stats);
2427 if ((m = STAILQ_FIRST(&tp->t_inqueue)) != NULL) {
2430 STAILQ_INIT(&tp->t_inqueue);
2431 STAILQ_FOREACH_FROM_SAFE(m, &tp->t_inqueue, m_stailqpkt, prev)
2434 TCPSTATES_DEC(tp->t_state);
2436 if (tp->t_fb->tfb_tcp_fb_fini)
2437 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
2438 MPASS(!tcp_in_hpts(tp));
2440 tcp_log_tcpcbfini(tp);
2444 * If we got enough samples through the srtt filter,
2445 * save the rtt and rttvar in the routing entry.
2446 * 'Enough' is arbitrarily defined as 4 rtt samples.
2447 * 4 samples is enough for the srtt filter to converge
2448 * to within enough % of the correct value; fewer samples
2449 * and we could save a bogus rtt. The danger is not high
2450 * as tcp quickly recovers from everything.
2451 * XXX: Works very well but needs some more statistics!
2453 * XXXRRS: Updating must be after the stack fini() since
2454 * that may be converting some internal representation of
2455 * say srtt etc into the general one used by other stacks.
2456 * Lets also at least protect against the so being NULL
2457 * as RW stated below.
2459 if ((tp->t_rttupdated >= 4) && (so != NULL)) {
2460 struct hc_metrics_lite metrics;
2463 bzero(&metrics, sizeof(metrics));
2465 * Update the ssthresh always when the conditions below
2466 * are satisfied. This gives us better new start value
2467 * for the congestion avoidance for new connections.
2468 * ssthresh is only set if packet loss occurred on a session.
2470 * XXXRW: 'so' may be NULL here, and/or socket buffer may be
2471 * being torn down. Ideally this code would not use 'so'.
2473 ssthresh = tp->snd_ssthresh;
2474 if (ssthresh != 0 && ssthresh < so->so_snd.sb_hiwat / 2) {
2476 * convert the limit from user data bytes to
2477 * packets then to packet data bytes.
2479 ssthresh = (ssthresh + tp->t_maxseg / 2) / tp->t_maxseg;
2482 ssthresh *= (tp->t_maxseg +
2484 (isipv6 ? sizeof (struct ip6_hdr) +
2485 sizeof (struct tcphdr) :
2487 sizeof (struct tcpiphdr)
2494 metrics.rmx_ssthresh = ssthresh;
2496 metrics.rmx_rtt = tp->t_srtt;
2497 metrics.rmx_rttvar = tp->t_rttvar;
2498 metrics.rmx_cwnd = tp->snd_cwnd;
2499 metrics.rmx_sendpipe = 0;
2500 metrics.rmx_recvpipe = 0;
2502 tcp_hc_update(&inp->inp_inc, &metrics);
2505 refcount_release(&tp->t_fb->tfb_refcnt);
2509 * Attempt to close a TCP control block, marking it as dropped, and freeing
2510 * the socket if we hold the only reference.
2513 tcp_close(struct tcpcb *tp)
2515 struct inpcb *inp = tptoinpcb(tp);
2516 struct socket *so = tptosocket(tp);
2518 INP_WLOCK_ASSERT(inp);
2521 if (tp->t_state == TCPS_LISTEN)
2522 tcp_offload_listen_stop(tp);
2525 * This releases the TFO pending counter resource for TFO listen
2526 * sockets as well as passively-created TFO sockets that transition
2527 * from SYN_RECEIVED to CLOSED.
2529 if (tp->t_tfo_pending) {
2530 tcp_fastopen_decrement_counter(tp->t_tfo_pending);
2531 tp->t_tfo_pending = NULL;
2534 tcp_hpts_remove(tp);
2537 TCPSTAT_INC(tcps_closed);
2538 if (tp->t_state != TCPS_CLOSED)
2539 tcp_state_change(tp, TCPS_CLOSED);
2540 KASSERT(inp->inp_socket != NULL, ("tcp_close: inp_socket NULL"));
2541 soisdisconnected(so);
2542 if (inp->inp_flags & INP_SOCKREF) {
2543 inp->inp_flags &= ~INP_SOCKREF;
2552 * Notify a tcp user of an asynchronous error;
2553 * store error as soft error, but wake up user
2554 * (for now, won't do anything until can select for soft error).
2556 * Do not wake up user since there currently is no mechanism for
2557 * reporting soft errors (yet - a kqueue filter may be added).
2559 static struct inpcb *
2560 tcp_notify(struct inpcb *inp, int error)
2564 INP_WLOCK_ASSERT(inp);
2566 tp = intotcpcb(inp);
2567 KASSERT(tp != NULL, ("tcp_notify: tp == NULL"));
2570 * Ignore some errors if we are hooked up.
2571 * If connection hasn't completed, has retransmitted several times,
2572 * and receives a second error, give up now. This is better
2573 * than waiting a long time to establish a connection that
2574 * can never complete.
2576 if (tp->t_state == TCPS_ESTABLISHED &&
2577 (error == EHOSTUNREACH || error == ENETUNREACH ||
2578 error == EHOSTDOWN)) {
2579 if (inp->inp_route.ro_nh) {
2580 NH_FREE(inp->inp_route.ro_nh);
2581 inp->inp_route.ro_nh = (struct nhop_object *)NULL;
2584 } else if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift > 3 &&
2586 tp = tcp_drop(tp, error);
2592 tp->t_softerror = error;
2596 wakeup( &so->so_timeo);
2603 tcp_pcblist(SYSCTL_HANDLER_ARGS)
2605 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_tcbinfo,
2606 INPLOOKUP_RLOCKPCB);
2611 if (req->newptr != NULL)
2614 if (req->oldptr == NULL) {
2617 n = V_tcbinfo.ipi_count +
2618 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
2619 n += imax(n / 8, 10);
2620 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xtcpcb);
2624 if ((error = sysctl_wire_old_buffer(req, 0)) != 0)
2627 bzero(&xig, sizeof(xig));
2628 xig.xig_len = sizeof xig;
2629 xig.xig_count = V_tcbinfo.ipi_count +
2630 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
2631 xig.xig_gen = V_tcbinfo.ipi_gencnt;
2632 xig.xig_sogen = so_gencnt;
2633 error = SYSCTL_OUT(req, &xig, sizeof xig);
2637 error = syncache_pcblist(req);
2641 while ((inp = inp_next(&inpi)) != NULL) {
2642 if (inp->inp_gencnt <= xig.xig_gen &&
2643 cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
2646 tcp_inptoxtp(inp, &xt);
2647 error = SYSCTL_OUT(req, &xt, sizeof xt);
2658 * Give the user an updated idea of our state.
2659 * If the generation differs from what we told
2660 * her before, she knows that something happened
2661 * while we were processing this request, and it
2662 * might be necessary to retry.
2664 xig.xig_gen = V_tcbinfo.ipi_gencnt;
2665 xig.xig_sogen = so_gencnt;
2666 xig.xig_count = V_tcbinfo.ipi_count +
2667 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
2668 error = SYSCTL_OUT(req, &xig, sizeof xig);
2674 SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist,
2675 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
2676 NULL, 0, tcp_pcblist, "S,xtcpcb",
2677 "List of active TCP connections");
2681 tcp_getcred(SYSCTL_HANDLER_ARGS)
2684 struct sockaddr_in addrs[2];
2685 struct epoch_tracker et;
2689 error = priv_check(req->td, PRIV_NETINET_GETCRED);
2692 error = SYSCTL_IN(req, addrs, sizeof(addrs));
2695 NET_EPOCH_ENTER(et);
2696 inp = in_pcblookup(&V_tcbinfo, addrs[1].sin_addr, addrs[1].sin_port,
2697 addrs[0].sin_addr, addrs[0].sin_port, INPLOOKUP_RLOCKPCB, NULL);
2701 error = cr_canseeinpcb(req->td->td_ucred, inp);
2703 cru2x(inp->inp_cred, &xuc);
2708 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
2712 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, getcred,
2713 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NEEDGIANT,
2714 0, 0, tcp_getcred, "S,xucred",
2715 "Get the xucred of a TCP connection");
2720 tcp6_getcred(SYSCTL_HANDLER_ARGS)
2722 struct epoch_tracker et;
2724 struct sockaddr_in6 addrs[2];
2731 error = priv_check(req->td, PRIV_NETINET_GETCRED);
2734 error = SYSCTL_IN(req, addrs, sizeof(addrs));
2737 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
2738 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
2741 if (IN6_IS_ADDR_V4MAPPED(&addrs[0].sin6_addr)) {
2743 if (IN6_IS_ADDR_V4MAPPED(&addrs[1].sin6_addr))
2750 NET_EPOCH_ENTER(et);
2753 inp = in_pcblookup(&V_tcbinfo,
2754 *(struct in_addr *)&addrs[1].sin6_addr.s6_addr[12],
2756 *(struct in_addr *)&addrs[0].sin6_addr.s6_addr[12],
2757 addrs[0].sin6_port, INPLOOKUP_RLOCKPCB, NULL);
2760 inp = in6_pcblookup(&V_tcbinfo,
2761 &addrs[1].sin6_addr, addrs[1].sin6_port,
2762 &addrs[0].sin6_addr, addrs[0].sin6_port,
2763 INPLOOKUP_RLOCKPCB, NULL);
2767 error = cr_canseeinpcb(req->td->td_ucred, inp);
2769 cru2x(inp->inp_cred, &xuc);
2774 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
2778 SYSCTL_PROC(_net_inet6_tcp6, OID_AUTO, getcred,
2779 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NEEDGIANT,
2780 0, 0, tcp6_getcred, "S,xucred",
2781 "Get the xucred of a TCP6 connection");
2785 /* Path MTU to try next when a fragmentation-needed message is received. */
2787 tcp_next_pmtu(const struct icmp *icp, const struct ip *ip)
2789 int mtu = ntohs(icp->icmp_nextmtu);
2791 /* If no alternative MTU was proposed, try the next smaller one. */
2793 mtu = ip_next_mtu(ntohs(ip->ip_len), 1);
2794 if (mtu < V_tcp_minmss + sizeof(struct tcpiphdr))
2795 mtu = V_tcp_minmss + sizeof(struct tcpiphdr);
2801 tcp_ctlinput_with_port(struct icmp *icp, uint16_t port)
2807 struct inpcb *(*notify)(struct inpcb *, int);
2808 struct in_conninfo inc;
2809 tcp_seq icmp_tcp_seq;
2812 errno = icmp_errmap(icp);
2817 notify = tcp_mtudisc_notify;
2821 notify = tcp_drop_syn_sent;
2823 notify = tcp_notify;
2826 if (V_icmp_may_rst && icp->icmp_type == ICMP_TIMXCEED)
2827 notify = tcp_drop_syn_sent;
2829 notify = tcp_notify;
2832 notify = tcp_notify;
2836 th = (struct tcphdr *)((caddr_t)ip + (ip->ip_hl << 2));
2837 icmp_tcp_seq = th->th_seq;
2838 inp = in_pcblookup(&V_tcbinfo, ip->ip_dst, th->th_dport, ip->ip_src,
2839 th->th_sport, INPLOOKUP_WLOCKPCB, NULL);
2841 tp = intotcpcb(inp);
2843 if (tp->t_flags & TF_TOE && errno == EMSGSIZE) {
2845 * MTU discovery for offloaded connections. Let
2846 * the TOE driver verify seq# and process it.
2848 mtu = tcp_next_pmtu(icp, ip);
2849 tcp_offload_pmtu_update(tp, icmp_tcp_seq, mtu);
2853 if (tp->t_port != port)
2855 if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) &&
2856 SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) {
2857 if (errno == EMSGSIZE) {
2859 * MTU discovery: we got a needfrag and
2860 * will potentially try a lower MTU.
2862 mtu = tcp_next_pmtu(icp, ip);
2865 * Only process the offered MTU if it
2866 * is smaller than the current one.
2868 if (mtu < tp->t_maxseg +
2869 sizeof(struct tcpiphdr)) {
2870 bzero(&inc, sizeof(inc));
2871 inc.inc_faddr = ip->ip_dst;
2873 inp->inp_inc.inc_fibnum;
2874 tcp_hc_updatemtu(&inc, mtu);
2875 inp = tcp_mtudisc(inp, mtu);
2878 inp = (*notify)(inp, errno);
2881 bzero(&inc, sizeof(inc));
2882 inc.inc_fport = th->th_dport;
2883 inc.inc_lport = th->th_sport;
2884 inc.inc_faddr = ip->ip_dst;
2885 inc.inc_laddr = ip->ip_src;
2886 syncache_unreach(&inc, icmp_tcp_seq, port);
2894 tcp_ctlinput(struct icmp *icmp)
2896 tcp_ctlinput_with_port(icmp, htons(0));
2900 tcp_ctlinput_viaudp(udp_tun_icmp_param_t param)
2902 /* Its a tunneled TCP over UDP icmp */
2903 struct icmp *icmp = param.icmp;
2904 struct ip *outer_ip, *inner_ip;
2906 struct tcphdr *th, ttemp;
2910 outer_ip = (struct ip *)((caddr_t)icmp - sizeof(struct ip));
2911 inner_ip = &icmp->icmp_ip;
2912 i_hlen = inner_ip->ip_hl << 2;
2913 o_len = ntohs(outer_ip->ip_len);
2915 (sizeof(struct ip) + 8 + i_hlen + sizeof(struct udphdr) + offsetof(struct tcphdr, th_ack))) {
2916 /* Not enough data present */
2919 /* Ok lets strip out the inner udphdr header by copying up on top of it the tcp hdr */
2920 udp = (struct udphdr *)(((caddr_t)inner_ip) + i_hlen);
2921 if (ntohs(udp->uh_sport) != V_tcp_udp_tunneling_port) {
2924 port = udp->uh_dport;
2925 th = (struct tcphdr *)(udp + 1);
2926 memcpy(&ttemp, th, sizeof(struct tcphdr));
2927 memcpy(udp, &ttemp, sizeof(struct tcphdr));
2928 /* Now adjust down the size of the outer IP header */
2929 o_len -= sizeof(struct udphdr);
2930 outer_ip->ip_len = htons(o_len);
2931 /* Now call in to the normal handling code */
2932 tcp_ctlinput_with_port(icmp, port);
2938 tcp6_next_pmtu(const struct icmp6_hdr *icmp6)
2940 int mtu = ntohl(icmp6->icmp6_mtu);
2943 * If no alternative MTU was proposed, or the proposed MTU was too
2944 * small, set to the min.
2946 if (mtu < IPV6_MMTU)
2947 mtu = IPV6_MMTU - 8; /* XXXNP: what is the adjustment for? */
2952 tcp6_ctlinput_with_port(struct ip6ctlparam *ip6cp, uint16_t port)
2954 struct in6_addr *dst;
2955 struct inpcb *(*notify)(struct inpcb *, int);
2956 struct ip6_hdr *ip6;
2960 struct icmp6_hdr *icmp6;
2961 struct in_conninfo inc;
2966 tcp_seq icmp_tcp_seq;
2971 icmp6 = ip6cp->ip6c_icmp6;
2973 ip6 = ip6cp->ip6c_ip6;
2974 off = ip6cp->ip6c_off;
2975 dst = &ip6cp->ip6c_finaldst->sin6_addr;
2977 errno = icmp6_errmap(icmp6);
2982 notify = tcp_mtudisc_notify;
2986 notify = tcp_drop_syn_sent;
2988 notify = tcp_notify;
2992 * There are only four ICMPs that may reset connection:
2993 * - administratively prohibited
2994 * - port unreachable
2995 * - time exceeded in transit
2996 * - unknown next header
2998 if (V_icmp_may_rst &&
2999 ((icmp6->icmp6_type == ICMP6_DST_UNREACH &&
3000 (icmp6->icmp6_code == ICMP6_DST_UNREACH_ADMIN ||
3001 icmp6->icmp6_code == ICMP6_DST_UNREACH_NOPORT)) ||
3002 (icmp6->icmp6_type == ICMP6_TIME_EXCEEDED &&
3003 icmp6->icmp6_code == ICMP6_TIME_EXCEED_TRANSIT) ||
3004 (icmp6->icmp6_type == ICMP6_PARAM_PROB &&
3005 icmp6->icmp6_code == ICMP6_PARAMPROB_NEXTHEADER)))
3006 notify = tcp_drop_syn_sent;
3008 notify = tcp_notify;
3011 notify = tcp_notify;
3014 /* Check if we can safely get the ports from the tcp hdr */
3017 (int32_t) (off + sizeof(struct tcp_ports)))) {
3020 bzero(&t_ports, sizeof(struct tcp_ports));
3021 m_copydata(m, off, sizeof(struct tcp_ports), (caddr_t)&t_ports);
3022 inp = in6_pcblookup(&V_tcbinfo, &ip6->ip6_dst, t_ports.th_dport,
3023 &ip6->ip6_src, t_ports.th_sport, INPLOOKUP_WLOCKPCB, NULL);
3024 off += sizeof(struct tcp_ports);
3025 if (m->m_pkthdr.len < (int32_t) (off + sizeof(tcp_seq))) {
3028 m_copydata(m, off, sizeof(tcp_seq), (caddr_t)&icmp_tcp_seq);
3030 tp = intotcpcb(inp);
3032 if (tp->t_flags & TF_TOE && errno == EMSGSIZE) {
3033 /* MTU discovery for offloaded connections. */
3034 mtu = tcp6_next_pmtu(icmp6);
3035 tcp_offload_pmtu_update(tp, icmp_tcp_seq, mtu);
3039 if (tp->t_port != port)
3041 if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) &&
3042 SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) {
3043 if (errno == EMSGSIZE) {
3046 * If we got a needfrag set the MTU
3047 * in the route to the suggested new
3048 * value (if given) and then notify.
3050 mtu = tcp6_next_pmtu(icmp6);
3052 bzero(&inc, sizeof(inc));
3053 inc.inc_fibnum = M_GETFIB(m);
3054 inc.inc_flags |= INC_ISIPV6;
3055 inc.inc6_faddr = *dst;
3056 if (in6_setscope(&inc.inc6_faddr,
3057 m->m_pkthdr.rcvif, NULL))
3060 * Only process the offered MTU if it
3061 * is smaller than the current one.
3063 if (mtu < tp->t_maxseg +
3064 sizeof (struct tcphdr) +
3065 sizeof (struct ip6_hdr)) {
3066 tcp_hc_updatemtu(&inc, mtu);
3067 tcp_mtudisc(inp, mtu);
3068 ICMP6STAT_INC(icp6s_pmtuchg);
3071 inp = (*notify)(inp, errno);
3074 bzero(&inc, sizeof(inc));
3075 inc.inc_fibnum = M_GETFIB(m);
3076 inc.inc_flags |= INC_ISIPV6;
3077 inc.inc_fport = t_ports.th_dport;
3078 inc.inc_lport = t_ports.th_sport;
3079 inc.inc6_faddr = *dst;
3080 inc.inc6_laddr = ip6->ip6_src;
3081 syncache_unreach(&inc, icmp_tcp_seq, port);
3089 tcp6_ctlinput(struct ip6ctlparam *ctl)
3091 tcp6_ctlinput_with_port(ctl, htons(0));
3095 tcp6_ctlinput_viaudp(udp_tun_icmp_param_t param)
3097 struct ip6ctlparam *ip6cp = param.ip6cp;
3102 m = m_pulldown(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(struct udphdr), NULL);
3106 udp = mtod(m, struct udphdr *);
3107 if (ntohs(udp->uh_sport) != V_tcp_udp_tunneling_port) {
3110 port = udp->uh_dport;
3111 m_adj(m, sizeof(struct udphdr));
3112 if ((m->m_flags & M_PKTHDR) == 0) {
3113 ip6cp->ip6c_m->m_pkthdr.len -= sizeof(struct udphdr);
3115 /* Now call in to the normal handling code */
3116 tcp6_ctlinput_with_port(ip6cp, port);
3122 tcp_keyed_hash(struct in_conninfo *inc, u_char *key, u_int len)
3127 KASSERT(len >= SIPHASH_KEY_LENGTH,
3128 ("%s: keylen %u too short ", __func__, len));
3129 SipHash24_Init(&ctx);
3130 SipHash_SetKey(&ctx, (uint8_t *)key);
3131 SipHash_Update(&ctx, &inc->inc_fport, sizeof(uint16_t));
3132 SipHash_Update(&ctx, &inc->inc_lport, sizeof(uint16_t));
3133 switch (inc->inc_flags & INC_ISIPV6) {
3136 SipHash_Update(&ctx, &inc->inc_faddr, sizeof(struct in_addr));
3137 SipHash_Update(&ctx, &inc->inc_laddr, sizeof(struct in_addr));
3142 SipHash_Update(&ctx, &inc->inc6_faddr, sizeof(struct in6_addr));
3143 SipHash_Update(&ctx, &inc->inc6_laddr, sizeof(struct in6_addr));
3147 SipHash_Final((uint8_t *)hash, &ctx);
3149 return (hash[0] ^ hash[1]);
3153 tcp_new_ts_offset(struct in_conninfo *inc)
3155 struct in_conninfo inc_store, *local_inc;
3157 if (!V_tcp_ts_offset_per_conn) {
3158 memcpy(&inc_store, inc, sizeof(struct in_conninfo));
3159 inc_store.inc_lport = 0;
3160 inc_store.inc_fport = 0;
3161 local_inc = &inc_store;
3165 return (tcp_keyed_hash(local_inc, V_ts_offset_secret,
3166 sizeof(V_ts_offset_secret)));
3170 * Following is where TCP initial sequence number generation occurs.
3172 * There are two places where we must use initial sequence numbers:
3173 * 1. In SYN-ACK packets.
3174 * 2. In SYN packets.
3176 * All ISNs for SYN-ACK packets are generated by the syncache. See
3177 * tcp_syncache.c for details.
3179 * The ISNs in SYN packets must be monotonic; TIME_WAIT recycling
3180 * depends on this property. In addition, these ISNs should be
3181 * unguessable so as to prevent connection hijacking. To satisfy
3182 * the requirements of this situation, the algorithm outlined in
3183 * RFC 1948 is used, with only small modifications.
3185 * Implementation details:
3187 * Time is based off the system timer, and is corrected so that it
3188 * increases by one megabyte per second. This allows for proper
3189 * recycling on high speed LANs while still leaving over an hour
3192 * As reading the *exact* system time is too expensive to be done
3193 * whenever setting up a TCP connection, we increment the time
3194 * offset in two ways. First, a small random positive increment
3195 * is added to isn_offset for each connection that is set up.
3196 * Second, the function tcp_isn_tick fires once per clock tick
3197 * and increments isn_offset as necessary so that sequence numbers
3198 * are incremented at approximately ISN_BYTES_PER_SECOND. The
3199 * random positive increments serve only to ensure that the same
3200 * exact sequence number is never sent out twice (as could otherwise
3201 * happen when a port is recycled in less than the system tick
3204 * net.inet.tcp.isn_reseed_interval controls the number of seconds
3205 * between seeding of isn_secret. This is normally set to zero,
3206 * as reseeding should not be necessary.
3208 * Locking of the global variables isn_secret, isn_last_reseed, isn_offset,
3209 * isn_offset_old, and isn_ctx is performed using the ISN lock. In
3210 * general, this means holding an exclusive (write) lock.
3213 #define ISN_BYTES_PER_SECOND 1048576
3214 #define ISN_STATIC_INCREMENT 4096
3215 #define ISN_RANDOM_INCREMENT (4096 - 1)
3216 #define ISN_SECRET_LENGTH SIPHASH_KEY_LENGTH
3218 VNET_DEFINE_STATIC(u_char, isn_secret[ISN_SECRET_LENGTH]);
3219 VNET_DEFINE_STATIC(int, isn_last);
3220 VNET_DEFINE_STATIC(int, isn_last_reseed);
3221 VNET_DEFINE_STATIC(u_int32_t, isn_offset);
3222 VNET_DEFINE_STATIC(u_int32_t, isn_offset_old);
3224 #define V_isn_secret VNET(isn_secret)
3225 #define V_isn_last VNET(isn_last)
3226 #define V_isn_last_reseed VNET(isn_last_reseed)
3227 #define V_isn_offset VNET(isn_offset)
3228 #define V_isn_offset_old VNET(isn_offset_old)
3231 tcp_new_isn(struct in_conninfo *inc)
3234 u_int32_t projected_offset;
3237 /* Seed if this is the first use, reseed if requested. */
3238 if ((V_isn_last_reseed == 0) || ((V_tcp_isn_reseed_interval > 0) &&
3239 (((u_int)V_isn_last_reseed + (u_int)V_tcp_isn_reseed_interval*hz)
3241 arc4rand(&V_isn_secret, sizeof(V_isn_secret), 0);
3242 V_isn_last_reseed = ticks;
3245 /* Compute the hash and return the ISN. */
3246 new_isn = (tcp_seq)tcp_keyed_hash(inc, V_isn_secret,
3247 sizeof(V_isn_secret));
3248 V_isn_offset += ISN_STATIC_INCREMENT +
3249 (arc4random() & ISN_RANDOM_INCREMENT);
3250 if (ticks != V_isn_last) {
3251 projected_offset = V_isn_offset_old +
3252 ISN_BYTES_PER_SECOND / hz * (ticks - V_isn_last);
3253 if (SEQ_GT(projected_offset, V_isn_offset))
3254 V_isn_offset = projected_offset;
3255 V_isn_offset_old = V_isn_offset;
3258 new_isn += V_isn_offset;
3264 * When a specific ICMP unreachable message is received and the
3265 * connection state is SYN-SENT, drop the connection. This behavior
3266 * is controlled by the icmp_may_rst sysctl.
3268 static struct inpcb *
3269 tcp_drop_syn_sent(struct inpcb *inp, int errno)
3274 INP_WLOCK_ASSERT(inp);
3276 tp = intotcpcb(inp);
3277 if (tp->t_state != TCPS_SYN_SENT)
3280 if (IS_FASTOPEN(tp->t_flags))
3281 tcp_fastopen_disable_path(tp);
3283 tp = tcp_drop(tp, errno);
3291 * When `need fragmentation' ICMP is received, update our idea of the MSS
3292 * based on the new value. Also nudge TCP to send something, since we
3293 * know the packet we just sent was dropped.
3294 * This duplicates some code in the tcp_mss() function in tcp_input.c.
3296 static struct inpcb *
3297 tcp_mtudisc_notify(struct inpcb *inp, int error)
3300 return (tcp_mtudisc(inp, -1));
3303 static struct inpcb *
3304 tcp_mtudisc(struct inpcb *inp, int mtuoffer)
3309 INP_WLOCK_ASSERT(inp);
3311 tp = intotcpcb(inp);
3312 KASSERT(tp != NULL, ("tcp_mtudisc: tp == NULL"));
3314 tcp_mss_update(tp, -1, mtuoffer, NULL, NULL);
3316 so = inp->inp_socket;
3317 SOCKBUF_LOCK(&so->so_snd);
3318 /* If the mss is larger than the socket buffer, decrease the mss. */
3319 if (so->so_snd.sb_hiwat < tp->t_maxseg)
3320 tp->t_maxseg = so->so_snd.sb_hiwat;
3321 SOCKBUF_UNLOCK(&so->so_snd);
3323 TCPSTAT_INC(tcps_mturesent);
3325 tp->snd_nxt = tp->snd_una;
3326 tcp_free_sackholes(tp);
3327 tp->snd_recover = tp->snd_max;
3328 if (tp->t_flags & TF_SACK_PERMIT)
3329 EXIT_FASTRECOVERY(tp->t_flags);
3330 if (tp->t_fb->tfb_tcp_mtu_chg != NULL) {
3332 * Conceptually the snd_nxt setting
3333 * and freeing sack holes should
3334 * be done by the default stacks
3335 * own tfb_tcp_mtu_chg().
3337 tp->t_fb->tfb_tcp_mtu_chg(tp);
3339 if (tcp_output(tp) < 0)
3347 * Look-up the routing entry to the peer of this inpcb. If no route
3348 * is found and it cannot be allocated, then return 0. This routine
3349 * is called by TCP routines that access the rmx structure and by
3350 * tcp_mss_update to get the peer/interface MTU.
3353 tcp_maxmtu(struct in_conninfo *inc, struct tcp_ifcap *cap)
3355 struct nhop_object *nh;
3357 uint32_t maxmtu = 0;
3359 KASSERT(inc != NULL, ("tcp_maxmtu with NULL in_conninfo pointer"));
3361 if (inc->inc_faddr.s_addr != INADDR_ANY) {
3362 nh = fib4_lookup(inc->inc_fibnum, inc->inc_faddr, 0, NHR_NONE, 0);
3367 maxmtu = nh->nh_mtu;
3369 /* Report additional interface capabilities. */
3371 if (ifp->if_capenable & IFCAP_TSO4 &&
3372 ifp->if_hwassist & CSUM_TSO) {
3373 cap->ifcap |= CSUM_TSO;
3374 cap->tsomax = ifp->if_hw_tsomax;
3375 cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
3376 cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
3386 tcp_maxmtu6(struct in_conninfo *inc, struct tcp_ifcap *cap)
3388 struct nhop_object *nh;
3389 struct in6_addr dst6;
3392 uint32_t maxmtu = 0;
3394 KASSERT(inc != NULL, ("tcp_maxmtu6 with NULL in_conninfo pointer"));
3396 if (inc->inc_flags & INC_IPV6MINMTU)
3399 if (!IN6_IS_ADDR_UNSPECIFIED(&inc->inc6_faddr)) {
3400 in6_splitscope(&inc->inc6_faddr, &dst6, &scopeid);
3401 nh = fib6_lookup(inc->inc_fibnum, &dst6, scopeid, NHR_NONE, 0);
3406 maxmtu = nh->nh_mtu;
3408 /* Report additional interface capabilities. */
3410 if (ifp->if_capenable & IFCAP_TSO6 &&
3411 ifp->if_hwassist & CSUM_TSO) {
3412 cap->ifcap |= CSUM_TSO;
3413 cap->tsomax = ifp->if_hw_tsomax;
3414 cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
3415 cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
3424 * Handle setsockopt(IPV6_USE_MIN_MTU) by a TCP stack.
3426 * XXXGL: we are updating inpcb here with INC_IPV6MINMTU flag.
3427 * The right place to do that is ip6_setpktopt() that has just been
3428 * executed. By the way it just filled ip6po_minmtu for us.
3431 tcp6_use_min_mtu(struct tcpcb *tp)
3433 struct inpcb *inp = tptoinpcb(tp);
3435 INP_WLOCK_ASSERT(inp);
3437 * In case of the IPV6_USE_MIN_MTU socket
3438 * option, the INC_IPV6MINMTU flag to announce
3439 * a corresponding MSS during the initial
3440 * handshake. If the TCP connection is not in
3441 * the front states, just reduce the MSS being
3442 * used. This avoids the sending of TCP
3443 * segments which will be fragmented at the
3446 inp->inp_inc.inc_flags |= INC_IPV6MINMTU;
3447 if ((tp->t_state >= TCPS_SYN_SENT) &&
3448 (inp->inp_inc.inc_flags & INC_ISIPV6)) {
3449 struct ip6_pktopts *opt;
3451 opt = inp->in6p_outputopts;
3452 if (opt != NULL && opt->ip6po_minmtu == IP6PO_MINMTU_ALL &&
3453 tp->t_maxseg > TCP6_MSS)
3454 tp->t_maxseg = TCP6_MSS;
3460 * Calculate effective SMSS per RFC5681 definition for a given TCP
3461 * connection at its current state, taking into account SACK and etc.
3464 tcp_maxseg(const struct tcpcb *tp)
3468 if (tp->t_flags & TF_NOOPT)
3469 return (tp->t_maxseg);
3472 * Here we have a simplified code from tcp_addoptions(),
3473 * without a proper loop, and having most of paddings hardcoded.
3474 * We might make mistakes with padding here in some edge cases,
3475 * but this is harmless, since result of tcp_maxseg() is used
3476 * only in cwnd and ssthresh estimations.
3478 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
3479 if (tp->t_flags & TF_RCVD_TSTMP)
3480 optlen = TCPOLEN_TSTAMP_APPA;
3483 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3484 if (tp->t_flags & TF_SIGNATURE)
3485 optlen += PADTCPOLEN(TCPOLEN_SIGNATURE);
3487 if ((tp->t_flags & TF_SACK_PERMIT) && tp->rcv_numsacks > 0) {
3488 optlen += TCPOLEN_SACKHDR;
3489 optlen += tp->rcv_numsacks * TCPOLEN_SACK;
3490 optlen = PADTCPOLEN(optlen);
3493 if (tp->t_flags & TF_REQ_TSTMP)
3494 optlen = TCPOLEN_TSTAMP_APPA;
3496 optlen = PADTCPOLEN(TCPOLEN_MAXSEG);
3497 if (tp->t_flags & TF_REQ_SCALE)
3498 optlen += PADTCPOLEN(TCPOLEN_WINDOW);
3499 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3500 if (tp->t_flags & TF_SIGNATURE)
3501 optlen += PADTCPOLEN(TCPOLEN_SIGNATURE);
3503 if (tp->t_flags & TF_SACK_PERMIT)
3504 optlen += PADTCPOLEN(TCPOLEN_SACK_PERMITTED);
3507 optlen = min(optlen, TCP_MAXOLEN);
3508 return (tp->t_maxseg - optlen);
3513 tcp_fixed_maxseg(const struct tcpcb *tp)
3517 if (tp->t_flags & TF_NOOPT)
3518 return (tp->t_maxseg);
3521 * Here we have a simplified code from tcp_addoptions(),
3522 * without a proper loop, and having most of paddings hardcoded.
3523 * We only consider fixed options that we would send every
3524 * time I.e. SACK is not considered. This is important
3525 * for cc modules to figure out what the modulo of the
3528 #define PAD(len) ((((len) / 4) + !!((len) % 4)) * 4)
3529 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
3530 if (tp->t_flags & TF_RCVD_TSTMP)
3531 optlen = TCPOLEN_TSTAMP_APPA;
3534 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3535 if (tp->t_flags & TF_SIGNATURE)
3536 optlen += PAD(TCPOLEN_SIGNATURE);
3539 if (tp->t_flags & TF_REQ_TSTMP)
3540 optlen = TCPOLEN_TSTAMP_APPA;
3542 optlen = PAD(TCPOLEN_MAXSEG);
3543 if (tp->t_flags & TF_REQ_SCALE)
3544 optlen += PAD(TCPOLEN_WINDOW);
3545 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3546 if (tp->t_flags & TF_SIGNATURE)
3547 optlen += PAD(TCPOLEN_SIGNATURE);
3549 if (tp->t_flags & TF_SACK_PERMIT)
3550 optlen += PAD(TCPOLEN_SACK_PERMITTED);
3553 optlen = min(optlen, TCP_MAXOLEN);
3554 return (tp->t_maxseg - optlen);
3560 sysctl_drop(SYSCTL_HANDLER_ARGS)
3562 /* addrs[0] is a foreign socket, addrs[1] is a local one. */
3563 struct sockaddr_storage addrs[2];
3567 struct sockaddr_in *fin = NULL, *lin = NULL;
3569 struct epoch_tracker et;
3571 struct sockaddr_in6 *fin6, *lin6;
3581 if (req->oldptr != NULL || req->oldlen != 0)
3583 if (req->newptr == NULL)
3585 if (req->newlen < sizeof(addrs))
3587 error = SYSCTL_IN(req, &addrs, sizeof(addrs));
3591 switch (addrs[0].ss_family) {
3594 fin6 = (struct sockaddr_in6 *)&addrs[0];
3595 lin6 = (struct sockaddr_in6 *)&addrs[1];
3596 if (fin6->sin6_len != sizeof(struct sockaddr_in6) ||
3597 lin6->sin6_len != sizeof(struct sockaddr_in6))
3599 if (IN6_IS_ADDR_V4MAPPED(&fin6->sin6_addr)) {
3600 if (!IN6_IS_ADDR_V4MAPPED(&lin6->sin6_addr))
3602 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[0]);
3603 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[1]);
3605 fin = (struct sockaddr_in *)&addrs[0];
3606 lin = (struct sockaddr_in *)&addrs[1];
3610 error = sa6_embedscope(fin6, V_ip6_use_defzone);
3613 error = sa6_embedscope(lin6, V_ip6_use_defzone);
3620 fin = (struct sockaddr_in *)&addrs[0];
3621 lin = (struct sockaddr_in *)&addrs[1];
3622 if (fin->sin_len != sizeof(struct sockaddr_in) ||
3623 lin->sin_len != sizeof(struct sockaddr_in))
3630 NET_EPOCH_ENTER(et);
3631 switch (addrs[0].ss_family) {
3634 inp = in6_pcblookup(&V_tcbinfo, &fin6->sin6_addr,
3635 fin6->sin6_port, &lin6->sin6_addr, lin6->sin6_port,
3636 INPLOOKUP_WLOCKPCB, NULL);
3641 inp = in_pcblookup(&V_tcbinfo, fin->sin_addr, fin->sin_port,
3642 lin->sin_addr, lin->sin_port, INPLOOKUP_WLOCKPCB, NULL);
3647 if (!SOLISTENING(inp->inp_socket)) {
3648 tp = intotcpcb(inp);
3649 tp = tcp_drop(tp, ECONNABORTED);
3660 SYSCTL_PROC(_net_inet_tcp, TCPCTL_DROP, drop,
3661 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
3662 CTLFLAG_NEEDGIANT, NULL, 0, sysctl_drop, "",
3663 "Drop TCP connection");
3666 tcp_sysctl_setsockopt(SYSCTL_HANDLER_ARGS)
3668 return (sysctl_setsockopt(oidp, arg1, arg2, req, &V_tcbinfo,
3669 &tcp_ctloutput_set));
3672 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, setsockopt,
3673 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
3674 CTLFLAG_MPSAFE, NULL, 0, tcp_sysctl_setsockopt, "",
3675 "Set socket option for TCP endpoint");
3679 sysctl_switch_tls(SYSCTL_HANDLER_ARGS)
3681 /* addrs[0] is a foreign socket, addrs[1] is a local one. */
3682 struct sockaddr_storage addrs[2];
3685 struct sockaddr_in *fin = NULL, *lin = NULL;
3687 struct epoch_tracker et;
3689 struct sockaddr_in6 *fin6, *lin6;
3699 if (req->oldptr != NULL || req->oldlen != 0)
3701 if (req->newptr == NULL)
3703 if (req->newlen < sizeof(addrs))
3705 error = SYSCTL_IN(req, &addrs, sizeof(addrs));
3709 switch (addrs[0].ss_family) {
3712 fin6 = (struct sockaddr_in6 *)&addrs[0];
3713 lin6 = (struct sockaddr_in6 *)&addrs[1];
3714 if (fin6->sin6_len != sizeof(struct sockaddr_in6) ||
3715 lin6->sin6_len != sizeof(struct sockaddr_in6))
3717 if (IN6_IS_ADDR_V4MAPPED(&fin6->sin6_addr)) {
3718 if (!IN6_IS_ADDR_V4MAPPED(&lin6->sin6_addr))
3720 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[0]);
3721 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[1]);
3723 fin = (struct sockaddr_in *)&addrs[0];
3724 lin = (struct sockaddr_in *)&addrs[1];
3728 error = sa6_embedscope(fin6, V_ip6_use_defzone);
3731 error = sa6_embedscope(lin6, V_ip6_use_defzone);
3738 fin = (struct sockaddr_in *)&addrs[0];
3739 lin = (struct sockaddr_in *)&addrs[1];
3740 if (fin->sin_len != sizeof(struct sockaddr_in) ||
3741 lin->sin_len != sizeof(struct sockaddr_in))
3748 NET_EPOCH_ENTER(et);
3749 switch (addrs[0].ss_family) {
3752 inp = in6_pcblookup(&V_tcbinfo, &fin6->sin6_addr,
3753 fin6->sin6_port, &lin6->sin6_addr, lin6->sin6_port,
3754 INPLOOKUP_WLOCKPCB, NULL);
3759 inp = in_pcblookup(&V_tcbinfo, fin->sin_addr, fin->sin_port,
3760 lin->sin_addr, lin->sin_port, INPLOOKUP_WLOCKPCB, NULL);
3768 so = inp->inp_socket;
3770 error = ktls_set_tx_mode(so,
3771 arg2 == 0 ? TCP_TLS_MODE_SW : TCP_TLS_MODE_IFNET);
3779 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, switch_to_sw_tls,
3780 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
3781 CTLFLAG_NEEDGIANT, NULL, 0, sysctl_switch_tls, "",
3782 "Switch TCP connection to SW TLS");
3783 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, switch_to_ifnet_tls,
3784 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
3785 CTLFLAG_NEEDGIANT, NULL, 1, sysctl_switch_tls, "",
3786 "Switch TCP connection to ifnet TLS");
3790 * Generate a standardized TCP log line for use throughout the
3791 * tcp subsystem. Memory allocation is done with M_NOWAIT to
3792 * allow use in the interrupt context.
3794 * NB: The caller MUST free(s, M_TCPLOG) the returned string.
3795 * NB: The function may return NULL if memory allocation failed.
3797 * Due to header inclusion and ordering limitations the struct ip
3798 * and ip6_hdr pointers have to be passed as void pointers.
3801 tcp_log_vain(struct in_conninfo *inc, struct tcphdr *th, const void *ip4hdr,
3805 /* Is logging enabled? */
3806 if (V_tcp_log_in_vain == 0)
3809 return (tcp_log_addr(inc, th, ip4hdr, ip6hdr));
3813 tcp_log_addrs(struct in_conninfo *inc, struct tcphdr *th, const void *ip4hdr,
3817 /* Is logging enabled? */
3818 if (tcp_log_debug == 0)
3821 return (tcp_log_addr(inc, th, ip4hdr, ip6hdr));
3825 tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th, const void *ip4hdr,
3831 const struct ip *ip = (const struct ip *)ip4hdr;
3834 const struct ip6_hdr *ip6 = (const struct ip6_hdr *)ip6hdr;
3838 * The log line looks like this:
3839 * "TCP: [1.2.3.4]:50332 to [1.2.3.4]:80 tcpflags 0x2<SYN>"
3841 size = sizeof("TCP: []:12345 to []:12345 tcpflags 0x2<>") +
3842 sizeof(PRINT_TH_FLAGS) + 1 +
3844 2 * INET6_ADDRSTRLEN;
3846 2 * INET_ADDRSTRLEN;
3849 s = malloc(size, M_TCPLOG, M_ZERO|M_NOWAIT);
3853 strcat(s, "TCP: [");
3856 if (inc && ((inc->inc_flags & INC_ISIPV6) == 0)) {
3857 inet_ntoa_r(inc->inc_faddr, sp);
3859 sprintf(sp, "]:%i to [", ntohs(inc->inc_fport));
3861 inet_ntoa_r(inc->inc_laddr, sp);
3863 sprintf(sp, "]:%i", ntohs(inc->inc_lport));
3866 ip6_sprintf(sp, &inc->inc6_faddr);
3868 sprintf(sp, "]:%i to [", ntohs(inc->inc_fport));
3870 ip6_sprintf(sp, &inc->inc6_laddr);
3872 sprintf(sp, "]:%i", ntohs(inc->inc_lport));
3873 } else if (ip6 && th) {
3874 ip6_sprintf(sp, &ip6->ip6_src);
3876 sprintf(sp, "]:%i to [", ntohs(th->th_sport));
3878 ip6_sprintf(sp, &ip6->ip6_dst);
3880 sprintf(sp, "]:%i", ntohs(th->th_dport));
3883 } else if (ip && th) {
3884 inet_ntoa_r(ip->ip_src, sp);
3886 sprintf(sp, "]:%i to [", ntohs(th->th_sport));
3888 inet_ntoa_r(ip->ip_dst, sp);
3890 sprintf(sp, "]:%i", ntohs(th->th_dport));
3898 sprintf(sp, " tcpflags 0x%b", tcp_get_flags(th), PRINT_TH_FLAGS);
3899 if (*(s + size - 1) != '\0')
3900 panic("%s: string too long", __func__);
3905 * A subroutine which makes it easy to track TCP state changes with DTrace.
3906 * This function shouldn't be called for t_state initializations that don't
3907 * correspond to actual TCP state transitions.
3910 tcp_state_change(struct tcpcb *tp, int newstate)
3912 #if defined(KDTRACE_HOOKS)
3913 int pstate = tp->t_state;
3916 TCPSTATES_DEC(tp->t_state);
3917 TCPSTATES_INC(newstate);
3918 tp->t_state = newstate;
3919 TCP_PROBE6(state__change, NULL, tp, NULL, tp, NULL, pstate);
3923 * Create an external-format (``xtcpcb'') structure using the information in
3924 * the kernel-format tcpcb structure pointed to by tp. This is done to
3925 * reduce the spew of irrelevant information over this interface, to isolate
3926 * user code from changes in the kernel structure, and potentially to provide
3927 * information-hiding if we decide that some of this information should be
3928 * hidden from users.
3931 tcp_inptoxtp(const struct inpcb *inp, struct xtcpcb *xt)
3933 struct tcpcb *tp = intotcpcb(inp);
3936 bzero(xt, sizeof(*xt));
3937 xt->t_state = tp->t_state;
3938 xt->t_logstate = tcp_get_bblog_state(tp);
3939 xt->t_flags = tp->t_flags;
3940 xt->t_sndzerowin = tp->t_sndzerowin;
3941 xt->t_sndrexmitpack = tp->t_sndrexmitpack;
3942 xt->t_rcvoopack = tp->t_rcvoopack;
3943 xt->t_rcv_wnd = tp->rcv_wnd;
3944 xt->t_snd_wnd = tp->snd_wnd;
3945 xt->t_snd_cwnd = tp->snd_cwnd;
3946 xt->t_snd_ssthresh = tp->snd_ssthresh;
3947 xt->t_dsack_bytes = tp->t_dsack_bytes;
3948 xt->t_dsack_tlp_bytes = tp->t_dsack_tlp_bytes;
3949 xt->t_dsack_pack = tp->t_dsack_pack;
3950 xt->t_maxseg = tp->t_maxseg;
3951 xt->xt_ecn = (tp->t_flags2 & TF2_ECN_PERMIT) ? 1 : 0 +
3952 (tp->t_flags2 & TF2_ACE_PERMIT) ? 2 : 0;
3954 now = getsbinuptime();
3955 #define COPYTIMER(which,where) do { \
3956 if (tp->t_timers[which] != SBT_MAX) \
3957 xt->where = (tp->t_timers[which] - now) / SBT_1MS; \
3961 COPYTIMER(TT_DELACK, tt_delack);
3962 COPYTIMER(TT_REXMT, tt_rexmt);
3963 COPYTIMER(TT_PERSIST, tt_persist);
3964 COPYTIMER(TT_KEEP, tt_keep);
3965 COPYTIMER(TT_2MSL, tt_2msl);
3967 xt->t_rcvtime = 1000 * (ticks - tp->t_rcvtime) / hz;
3969 xt->xt_encaps_port = tp->t_port;
3970 bcopy(tp->t_fb->tfb_tcp_block_name, xt->xt_stack,
3971 TCP_FUNCTION_NAME_LEN_MAX);
3972 bcopy(CC_ALGO(tp)->name, xt->xt_cc, TCP_CA_NAME_MAX);
3974 (void)tcp_log_get_id(tp, xt->xt_logid);
3977 xt->xt_len = sizeof(struct xtcpcb);
3978 in_pcbtoxinpcb(inp, &xt->xt_inp);
3980 * TCP doesn't use inp_ppcb pointer, we embed inpcb into tcpcb.
3981 * Fixup the pointer that in_pcbtoxinpcb() has set. When printing
3982 * TCP netstat(1) used to use this pointer, so this fixup needs to
3983 * stay for stable/14.
3985 xt->xt_inp.inp_ppcb = (uintptr_t)tp;
3989 tcp_log_end_status(struct tcpcb *tp, uint8_t status)
3994 (status > TCP_EI_STATUS_MAX_VALUE) ||
3999 if (status > (sizeof(uint32_t) * 8)) {
4000 /* Should this be a KASSERT? */
4003 bit = 1U << (status - 1);
4004 if (bit & tp->t_end_info_status) {
4005 /* already logged */
4008 for (i = 0; i < TCP_END_BYTE_INFO; i++) {
4009 if (tp->t_end_info_bytes[i] == TCP_EI_EMPTY_SLOT) {
4010 tp->t_end_info_bytes[i] = status;
4011 tp->t_end_info_status |= bit;
4018 tcp_can_enable_pacing(void)
4021 if ((tcp_pacing_limit == -1) ||
4022 (tcp_pacing_limit > number_of_tcp_connections_pacing)) {
4023 atomic_fetchadd_int(&number_of_tcp_connections_pacing, 1);
4024 shadow_num_connections = number_of_tcp_connections_pacing;
4027 counter_u64_add(tcp_pacing_failures, 1);
4032 static uint8_t tcp_pacing_warning = 0;
4035 tcp_decrement_paced_conn(void)
4039 ret = atomic_fetchadd_int(&number_of_tcp_connections_pacing, -1);
4040 shadow_num_connections = number_of_tcp_connections_pacing;
4041 KASSERT(ret != 0, ("tcp_paced_connection_exits -1 would cause wrap?"));
4043 if (tcp_pacing_limit != -1) {
4044 printf("Warning all pacing is now disabled, count decrements invalidly!\n");
4045 tcp_pacing_limit = 0;
4046 } else if (tcp_pacing_warning == 0) {
4047 printf("Warning pacing count is invalid, invalid decrement\n");
4048 tcp_pacing_warning = 1;
4054 tcp_default_switch_failed(struct tcpcb *tp)
4057 * If a switch fails we only need to
4058 * care about two things:
4061 * b) The timer granularity.
4062 * Timeouts, at least for now, don't use the
4063 * old callout system in the other stacks so
4064 * those are hopefully safe.
4066 tcp_lro_features_off(tp);
4067 tcp_change_time_units(tp, TCP_TMR_GRANULARITY_TICKS);
4070 #ifdef TCP_ACCOUNTING
4072 tcp_do_ack_accounting(struct tcpcb *tp, struct tcphdr *th, struct tcpopt *to, uint32_t tiwin, int mss)
4074 if (SEQ_LT(th->th_ack, tp->snd_una)) {
4075 /* Do we have a SACK? */
4076 if (to->to_flags & TOF_SACK) {
4077 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4078 tp->tcp_cnt_counters[ACK_SACK]++;
4082 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4083 tp->tcp_cnt_counters[ACK_BEHIND]++;
4085 return (ACK_BEHIND);
4087 } else if (th->th_ack == tp->snd_una) {
4088 /* Do we have a SACK? */
4089 if (to->to_flags & TOF_SACK) {
4090 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4091 tp->tcp_cnt_counters[ACK_SACK]++;
4094 } else if (tiwin != tp->snd_wnd) {
4095 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4096 tp->tcp_cnt_counters[ACK_RWND]++;
4100 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4101 tp->tcp_cnt_counters[ACK_DUPACK]++;
4103 return (ACK_DUPACK);
4106 if (!SEQ_GT(th->th_ack, tp->snd_max)) {
4107 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4108 tp->tcp_cnt_counters[CNT_OF_ACKS_IN] += (((th->th_ack - tp->snd_una) + mss - 1)/mss);
4111 if (to->to_flags & TOF_SACK) {
4112 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4113 tp->tcp_cnt_counters[ACK_CUMACK_SACK]++;
4115 return (ACK_CUMACK_SACK);
4117 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4118 tp->tcp_cnt_counters[ACK_CUMACK]++;
4120 return (ACK_CUMACK);
4127 tcp_change_time_units(struct tcpcb *tp, int granularity)
4129 if (tp->t_tmr_granularity == granularity) {
4133 if (granularity == TCP_TMR_GRANULARITY_USEC) {
4134 KASSERT((tp->t_tmr_granularity == TCP_TMR_GRANULARITY_TICKS),
4135 ("Granularity is not TICKS its %u in tp:%p",
4136 tp->t_tmr_granularity, tp));
4137 tp->t_rttlow = TICKS_2_USEC(tp->t_rttlow);
4138 if (tp->t_srtt > 1) {
4141 val = tp->t_srtt >> TCP_RTT_SHIFT;
4142 frac = tp->t_srtt & 0x1f;
4143 tp->t_srtt = TICKS_2_USEC(val);
4145 * frac is the fractional part of the srtt (if any)
4146 * but its in ticks and every bit represents
4151 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_MSEC) / (uint64_t)TCP_RTT_SCALE);
4153 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_SEC) / ((uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE));
4161 val = tp->t_rttvar >> TCP_RTTVAR_SHIFT;
4162 frac = tp->t_rttvar & 0x1f;
4163 tp->t_rttvar = TICKS_2_USEC(val);
4165 * frac is the fractional part of the srtt (if any)
4166 * but its in ticks and every bit represents
4171 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_MSEC) / (uint64_t)TCP_RTT_SCALE);
4173 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_SEC) / ((uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE));
4175 tp->t_rttvar += frac;
4178 tp->t_tmr_granularity = TCP_TMR_GRANULARITY_USEC;
4179 } else if (granularity == TCP_TMR_GRANULARITY_TICKS) {
4180 /* Convert back to ticks, with */
4181 KASSERT((tp->t_tmr_granularity == TCP_TMR_GRANULARITY_USEC),
4182 ("Granularity is not USEC its %u in tp:%p",
4183 tp->t_tmr_granularity, tp));
4184 if (tp->t_srtt > 1) {
4187 val = USEC_2_TICKS(tp->t_srtt);
4188 frac = tp->t_srtt % (HPTS_USEC_IN_SEC / hz);
4189 tp->t_srtt = val << TCP_RTT_SHIFT;
4191 * frac is the fractional part here is left
4192 * over from converting to hz and shifting.
4193 * We need to convert this to the 5 bit
4198 frac = (((uint64_t)frac * (uint64_t)TCP_RTT_SCALE) / (uint64_t)HPTS_USEC_IN_MSEC);
4200 frac = (((uint64_t)frac * (uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE) /(uint64_t)HPTS_USEC_IN_SEC);
4208 val = USEC_2_TICKS(tp->t_rttvar);
4209 frac = tp->t_srtt % (HPTS_USEC_IN_SEC / hz);
4210 tp->t_rttvar = val << TCP_RTTVAR_SHIFT;
4212 * frac is the fractional part here is left
4213 * over from converting to hz and shifting.
4214 * We need to convert this to the 5 bit
4219 frac = (((uint64_t)frac * (uint64_t)TCP_RTT_SCALE) / (uint64_t)HPTS_USEC_IN_MSEC);
4221 frac = (((uint64_t)frac * (uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE) /(uint64_t)HPTS_USEC_IN_SEC);
4223 tp->t_rttvar += frac;
4226 tp->t_rttlow = USEC_2_TICKS(tp->t_rttlow);
4227 tp->t_tmr_granularity = TCP_TMR_GRANULARITY_TICKS;
4231 panic("Unknown granularity:%d tp:%p",
4238 tcp_handle_orphaned_packets(struct tcpcb *tp)
4240 struct mbuf *save, *m, *prev;
4242 * Called when a stack switch is occuring from the fini()
4243 * of the old stack. We assue the init() as already been
4244 * run of the new stack and it has set the t_flags2 to
4245 * what it supports. This function will then deal with any
4246 * differences i.e. cleanup packets that maybe queued that
4247 * the newstack does not support.
4250 if (tp->t_flags2 & TF2_MBUF_L_ACKS)
4252 if ((tp->t_flags2 & TF2_SUPPORTS_MBUFQ) == 0 &&
4253 !STAILQ_EMPTY(&tp->t_inqueue)) {
4255 * It is unsafe to process the packets since a
4256 * reset may be lurking in them (its rare but it
4257 * can occur). If we were to find a RST, then we
4258 * would end up dropping the connection and the
4259 * INP lock, so when we return the caller (tcp_usrreq)
4260 * will blow up when it trys to unlock the inp.
4261 * This new stack does not do any fancy LRO features
4262 * so all we can do is toss the packets.
4264 m = STAILQ_FIRST(&tp->t_inqueue);
4265 STAILQ_INIT(&tp->t_inqueue);
4266 STAILQ_FOREACH_FROM_SAFE(m, &tp->t_inqueue, m_stailqpkt, save)
4270 * Here we have a stack that does mbuf queuing but
4271 * does not support compressed ack's. We must
4272 * walk all the mbufs and discard any compressed acks.
4274 STAILQ_FOREACH_SAFE(m, &tp->t_inqueue, m_stailqpkt, save) {
4275 if (m->m_flags & M_ACKCMP) {
4276 if (m == STAILQ_FIRST(&tp->t_inqueue))
4277 STAILQ_REMOVE_HEAD(&tp->t_inqueue,
4280 STAILQ_REMOVE_AFTER(&tp->t_inqueue,
4289 #ifdef TCP_REQUEST_TRK
4291 tcp_estimate_tls_overhead(struct socket *so, uint64_t tls_usr_bytes)
4294 struct ktls_session *tls;
4295 uint32_t rec_oh, records;
4297 tls = so->so_snd.sb_tls_info;
4301 rec_oh = tls->params.tls_hlen + tls->params.tls_tlen;
4302 records = ((tls_usr_bytes + tls->params.max_frame_len - 1)/tls->params.max_frame_len);
4303 return (records * rec_oh);
4309 extern uint32_t tcp_stale_entry_time;
4310 uint32_t tcp_stale_entry_time = 250000;
4311 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, usrlog_stale, CTLFLAG_RW,
4312 &tcp_stale_entry_time, 250000, "Time that a tcpreq entry without a sendfile ages out");
4315 tcp_req_log_req_info(struct tcpcb *tp, struct tcp_sendfile_track *req,
4316 uint16_t slot, uint8_t val, uint64_t offset, uint64_t nbytes)
4318 if (tcp_bblogging_on(tp)) {
4319 union tcp_log_stackspecific log;
4322 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
4324 log.u_bbr.inhpts = tcp_in_hpts(tp);
4326 log.u_bbr.flex8 = val;
4327 log.u_bbr.rttProp = req->timestamp;
4328 log.u_bbr.delRate = req->start;
4329 log.u_bbr.cur_del_rate = req->end;
4330 log.u_bbr.flex1 = req->start_seq;
4331 log.u_bbr.flex2 = req->end_seq;
4332 log.u_bbr.flex3 = req->flags;
4333 log.u_bbr.flex4 = ((req->localtime >> 32) & 0x00000000ffffffff);
4334 log.u_bbr.flex5 = (req->localtime & 0x00000000ffffffff);
4335 log.u_bbr.flex7 = slot;
4336 log.u_bbr.bw_inuse = offset;
4337 /* nbytes = flex6 | epoch */
4338 log.u_bbr.flex6 = ((nbytes >> 32) & 0x00000000ffffffff);
4339 log.u_bbr.epoch = (nbytes & 0x00000000ffffffff);
4340 /* cspr = lt_epoch | pkts_out */
4341 log.u_bbr.lt_epoch = ((req->cspr >> 32) & 0x00000000ffffffff);
4342 log.u_bbr.pkts_out |= (req->cspr & 0x00000000ffffffff);
4343 log.u_bbr.applimited = tp->t_tcpreq_closed;
4344 log.u_bbr.applimited <<= 8;
4345 log.u_bbr.applimited |= tp->t_tcpreq_open;
4346 log.u_bbr.applimited <<= 8;
4347 log.u_bbr.applimited |= tp->t_tcpreq_req;
4348 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
4349 TCP_LOG_EVENTP(tp, NULL,
4350 &tptosocket(tp)->so_rcv,
4351 &tptosocket(tp)->so_snd,
4353 0, &log, false, &tv);
4358 tcp_req_free_a_slot(struct tcpcb *tp, struct tcp_sendfile_track *ent)
4360 if (tp->t_tcpreq_req > 0)
4362 if (ent->flags & TCP_TRK_TRACK_FLG_OPEN) {
4363 if (tp->t_tcpreq_open > 0)
4364 tp->t_tcpreq_open--;
4366 if (tp->t_tcpreq_closed > 0)
4367 tp->t_tcpreq_closed--;
4369 ent->flags = TCP_TRK_TRACK_FLG_EMPTY;
4373 tcp_req_check_for_stale_entries(struct tcpcb *tp, uint64_t ts, int rm_oldest)
4375 struct tcp_sendfile_track *ent;
4376 uint64_t time_delta, oldest_delta;
4377 int i, oldest, oldest_set = 0, cnt_rm = 0;
4379 for(i = 0; i < MAX_TCP_TRK_REQ; i++) {
4380 ent = &tp->t_tcpreq_info[i];
4381 if (ent->flags != TCP_TRK_TRACK_FLG_USED) {
4383 * We only care about closed end ranges
4384 * that are allocated and have no sendfile
4385 * ever touching them. They would be in
4390 if (ts >= ent->localtime)
4391 time_delta = ts - ent->localtime;
4395 ((oldest_delta < time_delta) || (oldest_set == 0))) {
4398 oldest_delta = time_delta;
4400 if (tcp_stale_entry_time && (time_delta >= tcp_stale_entry_time)) {
4402 * No sendfile in a our time-limit
4406 tcp_req_log_req_info(tp, &tp->t_tcpreq_info[i], i, TCP_TRK_REQ_LOG_STALE,
4408 tcp_req_free_a_slot(tp, ent);
4411 if ((cnt_rm == 0) && rm_oldest && oldest_set) {
4412 ent = &tp->t_tcpreq_info[oldest];
4413 tcp_req_log_req_info(tp, &tp->t_tcpreq_info[i], i, TCP_TRK_REQ_LOG_STALE,
4415 tcp_req_free_a_slot(tp, ent);
4420 tcp_req_check_for_comp(struct tcpcb *tp, tcp_seq ack_point)
4423 struct tcp_sendfile_track *ent;
4425 /* Clean up any old closed end requests that are now completed */
4426 if (tp->t_tcpreq_req == 0)
4428 if (tp->t_tcpreq_closed == 0)
4430 for(i = 0; i < MAX_TCP_TRK_REQ; i++) {
4431 ent = &tp->t_tcpreq_info[i];
4432 /* Skip empty ones */
4433 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY)
4435 /* Skip open ones */
4436 if (ent->flags & TCP_TRK_TRACK_FLG_OPEN)
4438 if (SEQ_GEQ(ack_point, ent->end_seq)) {
4439 /* We are past it -- free it */
4440 tcp_req_log_req_info(tp, ent,
4441 i, TCP_TRK_REQ_LOG_FREED, 0, 0);
4442 tcp_req_free_a_slot(tp, ent);
4450 tcp_req_is_entry_comp(struct tcpcb *tp, struct tcp_sendfile_track *ent, tcp_seq ack_point)
4452 if (tp->t_tcpreq_req == 0)
4454 if (tp->t_tcpreq_closed == 0)
4456 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY)
4458 if (SEQ_GEQ(ack_point, ent->end_seq)) {
4464 struct tcp_sendfile_track *
4465 tcp_req_find_a_req_that_is_completed_by(struct tcpcb *tp, tcp_seq th_ack, int *ip)
4468 * Given an ack point (th_ack) walk through our entries and
4469 * return the first one found that th_ack goes past the
4472 struct tcp_sendfile_track *ent;
4475 if (tp->t_tcpreq_req == 0) {
4479 for(i = 0; i < MAX_TCP_TRK_REQ; i++) {
4480 ent = &tp->t_tcpreq_info[i];
4481 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY)
4483 if ((ent->flags & TCP_TRK_TRACK_FLG_OPEN) == 0) {
4484 if (SEQ_GEQ(th_ack, ent->end_seq)) {
4493 struct tcp_sendfile_track *
4494 tcp_req_find_req_for_seq(struct tcpcb *tp, tcp_seq seq)
4496 struct tcp_sendfile_track *ent;
4499 if (tp->t_tcpreq_req == 0) {
4503 for(i = 0; i < MAX_TCP_TRK_REQ; i++) {
4504 ent = &tp->t_tcpreq_info[i];
4505 tcp_req_log_req_info(tp, ent, i, TCP_TRK_REQ_LOG_SEARCH,
4507 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY) {
4510 if (ent->flags & TCP_TRK_TRACK_FLG_OPEN) {
4512 * An open end request only needs to
4513 * match the beginning seq or be
4514 * all we have (once we keep going on
4515 * a open end request we may have a seq
4518 if ((SEQ_GEQ(seq, ent->start_seq)) ||
4519 (tp->t_tcpreq_closed == 0))
4523 * For this one we need to
4524 * be a bit more careful if its
4525 * completed at least.
4527 if ((SEQ_GEQ(seq, ent->start_seq)) &&
4528 (SEQ_LT(seq, ent->end_seq))) {
4536 /* Should this be in its own file tcp_req.c ? */
4537 struct tcp_sendfile_track *
4538 tcp_req_alloc_req_full(struct tcpcb *tp, struct tcp_snd_req *req, uint64_t ts, int rec_dups)
4540 struct tcp_sendfile_track *fil;
4543 /* In case the stack does not check for completions do so now */
4544 tcp_req_check_for_comp(tp, tp->snd_una);
4545 /* Check for stale entries */
4546 if (tp->t_tcpreq_req)
4547 tcp_req_check_for_stale_entries(tp, ts,
4548 (tp->t_tcpreq_req >= MAX_TCP_TRK_REQ));
4549 /* Check to see if this is a duplicate of one not started */
4550 if (tp->t_tcpreq_req) {
4551 for(i = 0, allocated = 0; i < MAX_TCP_TRK_REQ; i++) {
4552 fil = &tp->t_tcpreq_info[i];
4553 if (fil->flags != TCP_TRK_TRACK_FLG_USED)
4555 if ((fil->timestamp == req->timestamp) &&
4556 (fil->start == req->start) &&
4557 ((fil->flags & TCP_TRK_TRACK_FLG_OPEN) ||
4558 (fil->end == req->end))) {
4560 * We already have this request
4561 * and it has not been started with sendfile.
4562 * This probably means the user was returned
4563 * a 4xx of some sort and its going to age
4564 * out, lets not duplicate it.
4570 /* Ok if there is no room at the inn we are in trouble */
4571 if (tp->t_tcpreq_req >= MAX_TCP_TRK_REQ) {
4572 tcp_trace_point(tp, TCP_TP_REQ_LOG_FAIL);
4573 for(i = 0; i < MAX_TCP_TRK_REQ; i++) {
4574 tcp_req_log_req_info(tp, &tp->t_tcpreq_info[i],
4575 i, TCP_TRK_REQ_LOG_ALLOCFAIL, 0, 0);
4579 for(i = 0, allocated = 0; i < MAX_TCP_TRK_REQ; i++) {
4580 fil = &tp->t_tcpreq_info[i];
4581 if (fil->flags == TCP_TRK_TRACK_FLG_EMPTY) {
4583 fil->flags = TCP_TRK_TRACK_FLG_USED;
4584 fil->timestamp = req->timestamp;
4585 fil->localtime = ts;
4586 fil->start = req->start;
4587 if (req->flags & TCP_LOG_HTTPD_RANGE_END) {
4588 fil->end = req->end;
4591 fil->flags |= TCP_TRK_TRACK_FLG_OPEN;
4594 * We can set the min boundaries to the TCP Sequence space,
4595 * but it might be found to be further up when sendfile
4596 * actually runs on this range (if it ever does).
4598 fil->sbcc_at_s = tptosocket(tp)->so_snd.sb_ccc;
4599 fil->start_seq = tp->snd_una +
4600 tptosocket(tp)->so_snd.sb_ccc;
4601 fil->end_seq = (fil->start_seq + ((uint32_t)(fil->end - fil->start)));
4602 if (tptosocket(tp)->so_snd.sb_tls_info) {
4604 * This session is doing TLS. Take a swag guess
4607 fil->end_seq += tcp_estimate_tls_overhead(
4608 tptosocket(tp), (fil->end - fil->start));
4611 if (fil->flags & TCP_TRK_TRACK_FLG_OPEN)
4612 tp->t_tcpreq_open++;
4614 tp->t_tcpreq_closed++;
4615 tcp_req_log_req_info(tp, fil, i,
4616 TCP_TRK_REQ_LOG_NEW, 0, 0);
4625 tcp_req_alloc_req(struct tcpcb *tp, union tcp_log_userdata *user, uint64_t ts)
4627 (void)tcp_req_alloc_req_full(tp, &user->tcp_req, ts, 1);
4632 tcp_log_socket_option(struct tcpcb *tp, uint32_t option_num, uint32_t option_val, int err)
4634 if (tcp_bblogging_on(tp)) {
4635 struct tcp_log_buffer *l;
4637 l = tcp_log_event(tp, NULL,
4638 &tptosocket(tp)->so_rcv,
4639 &tptosocket(tp)->so_snd,
4642 NULL, NULL, 0, NULL);
4644 l->tlb_flex1 = option_num;
4645 l->tlb_flex2 = option_val;
4651 tcp_get_srtt(struct tcpcb *tp, int granularity)
4655 KASSERT(granularity == TCP_TMR_GRANULARITY_USEC ||
4656 granularity == TCP_TMR_GRANULARITY_TICKS,
4657 ("%s: called with unexpected granularity %d", __func__,
4663 * We only support two granularities. If the stored granularity
4664 * does not match the granularity requested by the caller,
4665 * convert the stored value to the requested unit of granularity.
4667 if (tp->t_tmr_granularity != granularity) {
4668 if (granularity == TCP_TMR_GRANULARITY_USEC)
4669 srtt = TICKS_2_USEC(srtt);
4671 srtt = USEC_2_TICKS(srtt);
4675 * If the srtt is stored with ticks granularity, we need to
4676 * unshift to get the actual value. We do this after the
4677 * conversion above (if one was necessary) in order to maximize
4680 if (tp->t_tmr_granularity == TCP_TMR_GRANULARITY_TICKS)
4681 srtt = srtt >> TCP_RTT_SHIFT;