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");
309 * Target size of TCP PCB hash tables. Must be a power of two.
311 * Note that this can be overridden by the kernel environment
312 * variable net.inet.tcp.tcbhashsize
315 #define TCBHASHSIZE 0
317 static int tcp_tcbhashsize = TCBHASHSIZE;
318 SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RDTUN,
319 &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable");
321 static int do_tcpdrain = 1;
322 SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0,
323 "Enable tcp_drain routine for extra help when low on mbufs");
325 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_VNET | CTLFLAG_RD,
326 &VNET_NAME(tcbinfo.ipi_count), 0, "Number of active PCBs");
328 VNET_DEFINE_STATIC(int, icmp_may_rst) = 1;
329 #define V_icmp_may_rst VNET(icmp_may_rst)
330 SYSCTL_INT(_net_inet_tcp, OID_AUTO, icmp_may_rst, CTLFLAG_VNET | CTLFLAG_RW,
331 &VNET_NAME(icmp_may_rst), 0,
332 "Certain ICMP unreachable messages may abort connections in SYN_SENT");
334 VNET_DEFINE_STATIC(int, tcp_isn_reseed_interval) = 0;
335 #define V_tcp_isn_reseed_interval VNET(tcp_isn_reseed_interval)
336 SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_VNET | CTLFLAG_RW,
337 &VNET_NAME(tcp_isn_reseed_interval), 0,
338 "Seconds between reseeding of ISN secret");
340 static int tcp_soreceive_stream;
341 SYSCTL_INT(_net_inet_tcp, OID_AUTO, soreceive_stream, CTLFLAG_RDTUN,
342 &tcp_soreceive_stream, 0, "Using soreceive_stream for TCP sockets");
344 VNET_DEFINE(uma_zone_t, sack_hole_zone);
345 #define V_sack_hole_zone VNET(sack_hole_zone)
346 VNET_DEFINE(uint32_t, tcp_map_entries_limit) = 0; /* unlimited */
348 sysctl_net_inet_tcp_map_limit_check(SYSCTL_HANDLER_ARGS)
353 new = V_tcp_map_entries_limit;
354 error = sysctl_handle_int(oidp, &new, 0, req);
355 if (error == 0 && req->newptr) {
356 /* only allow "0" and value > minimum */
357 if (new > 0 && new < TCP_MIN_MAP_ENTRIES_LIMIT)
360 V_tcp_map_entries_limit = new;
364 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, map_limit,
365 CTLFLAG_VNET | CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
366 &VNET_NAME(tcp_map_entries_limit), 0,
367 &sysctl_net_inet_tcp_map_limit_check, "IU",
368 "Total sendmap entries limit");
370 VNET_DEFINE(uint32_t, tcp_map_split_limit) = 0; /* unlimited */
371 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, split_limit, CTLFLAG_VNET | CTLFLAG_RW,
372 &VNET_NAME(tcp_map_split_limit), 0,
373 "Total sendmap split entries limit");
376 VNET_DEFINE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST+1]);
379 #define TS_OFFSET_SECRET_LENGTH SIPHASH_KEY_LENGTH
380 VNET_DEFINE_STATIC(u_char, ts_offset_secret[TS_OFFSET_SECRET_LENGTH]);
381 #define V_ts_offset_secret VNET(ts_offset_secret)
383 static int tcp_default_fb_init(struct tcpcb *tp, void **ptr);
384 static void tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged);
385 static int tcp_default_handoff_ok(struct tcpcb *tp);
386 static struct inpcb *tcp_notify(struct inpcb *, int);
387 static struct inpcb *tcp_mtudisc_notify(struct inpcb *, int);
388 static struct inpcb *tcp_mtudisc(struct inpcb *, int);
389 static struct inpcb *tcp_drop_syn_sent(struct inpcb *, int);
390 static char * tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th,
391 const void *ip4hdr, const void *ip6hdr);
392 static void tcp_default_switch_failed(struct tcpcb *tp);
393 static ipproto_ctlinput_t tcp_ctlinput;
394 static udp_tun_icmp_t tcp_ctlinput_viaudp;
396 static struct tcp_function_block tcp_def_funcblk = {
397 .tfb_tcp_block_name = "freebsd",
398 .tfb_tcp_output = tcp_default_output,
399 .tfb_tcp_do_segment = tcp_do_segment,
400 .tfb_tcp_ctloutput = tcp_default_ctloutput,
401 .tfb_tcp_handoff_ok = tcp_default_handoff_ok,
402 .tfb_tcp_fb_init = tcp_default_fb_init,
403 .tfb_tcp_fb_fini = tcp_default_fb_fini,
404 .tfb_switch_failed = tcp_default_switch_failed,
407 static int tcp_fb_cnt = 0;
408 struct tcp_funchead t_functions;
409 VNET_DEFINE_STATIC(struct tcp_function_block *, tcp_func_set_ptr) = &tcp_def_funcblk;
410 #define V_tcp_func_set_ptr VNET(tcp_func_set_ptr)
413 tcp_record_dsack(struct tcpcb *tp, tcp_seq start, tcp_seq end, int tlp)
415 TCPSTAT_INC(tcps_dsack_count);
418 if (SEQ_GT(end, start)) {
419 tp->t_dsack_bytes += (end - start);
420 TCPSTAT_ADD(tcps_dsack_bytes, (end - start));
422 tp->t_dsack_tlp_bytes += (start - end);
423 TCPSTAT_ADD(tcps_dsack_bytes, (start - end));
426 if (SEQ_GT(end, start)) {
427 tp->t_dsack_bytes += (end - start);
428 TCPSTAT_ADD(tcps_dsack_tlp_bytes, (end - start));
430 tp->t_dsack_tlp_bytes += (start - end);
431 TCPSTAT_ADD(tcps_dsack_tlp_bytes, (start - end));
436 static struct tcp_function_block *
437 find_tcp_functions_locked(struct tcp_function_set *fs)
439 struct tcp_function *f;
440 struct tcp_function_block *blk=NULL;
442 TAILQ_FOREACH(f, &t_functions, tf_next) {
443 if (strcmp(f->tf_name, fs->function_set_name) == 0) {
451 static struct tcp_function_block *
452 find_tcp_fb_locked(struct tcp_function_block *blk, struct tcp_function **s)
454 struct tcp_function_block *rblk=NULL;
455 struct tcp_function *f;
457 TAILQ_FOREACH(f, &t_functions, tf_next) {
458 if (f->tf_fb == blk) {
469 struct tcp_function_block *
470 find_and_ref_tcp_functions(struct tcp_function_set *fs)
472 struct tcp_function_block *blk;
474 rw_rlock(&tcp_function_lock);
475 blk = find_tcp_functions_locked(fs);
477 refcount_acquire(&blk->tfb_refcnt);
478 rw_runlock(&tcp_function_lock);
482 struct tcp_function_block *
483 find_and_ref_tcp_fb(struct tcp_function_block *blk)
485 struct tcp_function_block *rblk;
487 rw_rlock(&tcp_function_lock);
488 rblk = find_tcp_fb_locked(blk, NULL);
490 refcount_acquire(&rblk->tfb_refcnt);
491 rw_runlock(&tcp_function_lock);
495 /* Find a matching alias for the given tcp_function_block. */
497 find_tcp_function_alias(struct tcp_function_block *blk,
498 struct tcp_function_set *fs)
500 struct tcp_function *f;
504 rw_rlock(&tcp_function_lock);
505 TAILQ_FOREACH(f, &t_functions, tf_next) {
506 if ((f->tf_fb == blk) &&
507 (strncmp(f->tf_name, blk->tfb_tcp_block_name,
508 TCP_FUNCTION_NAME_LEN_MAX) != 0)) {
509 /* Matching function block with different name. */
510 strncpy(fs->function_set_name, f->tf_name,
511 TCP_FUNCTION_NAME_LEN_MAX);
516 /* Null terminate the string appropriately. */
518 fs->function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0';
520 fs->function_set_name[0] = '\0';
522 rw_runlock(&tcp_function_lock);
526 static struct tcp_function_block *
527 find_and_ref_tcp_default_fb(void)
529 struct tcp_function_block *rblk;
531 rw_rlock(&tcp_function_lock);
532 rblk = V_tcp_func_set_ptr;
533 refcount_acquire(&rblk->tfb_refcnt);
534 rw_runlock(&tcp_function_lock);
539 tcp_switch_back_to_default(struct tcpcb *tp)
541 struct tcp_function_block *tfb;
544 KASSERT(tp->t_fb != &tcp_def_funcblk,
545 ("%s: called by the built-in default stack", __func__));
548 * Now, we'll find a new function block to use.
549 * Start by trying the current user-selected
550 * default, unless this stack is the user-selected
553 tfb = find_and_ref_tcp_default_fb();
554 if (tfb == tp->t_fb) {
555 refcount_release(&tfb->tfb_refcnt);
558 /* Does the stack accept this connection? */
559 if (tfb != NULL && tfb->tfb_tcp_handoff_ok != NULL &&
560 (*tfb->tfb_tcp_handoff_ok)(tp)) {
561 refcount_release(&tfb->tfb_refcnt);
564 /* Try to use that stack. */
566 /* Initialize the new stack. If it succeeds, we are done. */
567 if (tfb->tfb_tcp_fb_init == NULL ||
568 (*tfb->tfb_tcp_fb_init)(tp, &ptr) == 0) {
569 /* Release the old stack */
570 if (tp->t_fb->tfb_tcp_fb_fini != NULL)
571 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
572 refcount_release(&tp->t_fb->tfb_refcnt);
573 /* Now set in all the pointers */
579 * Initialization failed. Release the reference count on
580 * the looked up default stack.
582 refcount_release(&tfb->tfb_refcnt);
586 * If that wasn't feasible, use the built-in default
587 * stack which is not allowed to reject anyone.
589 tfb = find_and_ref_tcp_fb(&tcp_def_funcblk);
591 /* there always should be a default */
592 panic("Can't refer to tcp_def_funcblk");
594 if (tfb->tfb_tcp_handoff_ok != NULL) {
595 if ((*tfb->tfb_tcp_handoff_ok) (tp)) {
596 /* The default stack cannot say no */
597 panic("Default stack rejects a new session?");
600 if (tfb->tfb_tcp_fb_init != NULL &&
601 (*tfb->tfb_tcp_fb_init)(tp, &ptr)) {
602 /* The default stack cannot fail */
603 panic("Default stack initialization failed");
605 /* Now release the old stack */
606 if (tp->t_fb->tfb_tcp_fb_fini != NULL)
607 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
608 refcount_release(&tp->t_fb->tfb_refcnt);
609 /* And set in the pointers to the new */
615 tcp_recv_udp_tunneled_packet(struct mbuf *m, int off, struct inpcb *inp,
616 const struct sockaddr *sa, void *ctx)
627 TCPSTAT_INC(tcps_tunneled_pkts);
628 if ((m->m_flags & M_PKTHDR) == 0) {
629 /* Can't handle one that is not a pkt hdr */
630 TCPSTAT_INC(tcps_tunneled_errs);
633 thlen = sizeof(struct tcphdr);
634 if (m->m_len < off + sizeof(struct udphdr) + thlen &&
635 (m = m_pullup(m, off + sizeof(struct udphdr) + thlen)) == NULL) {
636 TCPSTAT_INC(tcps_tunneled_errs);
639 iph = mtod(m, struct ip *);
640 uh = (struct udphdr *)((caddr_t)iph + off);
641 th = (struct tcphdr *)(uh + 1);
642 thlen = th->th_off << 2;
643 if (m->m_len < off + sizeof(struct udphdr) + thlen) {
644 m = m_pullup(m, off + sizeof(struct udphdr) + thlen);
646 TCPSTAT_INC(tcps_tunneled_errs);
649 iph = mtod(m, struct ip *);
650 uh = (struct udphdr *)((caddr_t)iph + off);
651 th = (struct tcphdr *)(uh + 1);
654 m->m_pkthdr.tcp_tun_port = port = uh->uh_sport;
655 bcopy(th, uh, m->m_len - off);
656 m->m_len -= sizeof(struct udphdr);
657 m->m_pkthdr.len -= sizeof(struct udphdr);
659 * We use the same algorithm for
660 * both UDP and TCP for c-sum. So
661 * the code in tcp_input will skip
662 * the checksum. So we do nothing
663 * with the flag (m->m_pkthdr.csum_flags).
668 iph->ip_len = htons(ntohs(iph->ip_len) - sizeof(struct udphdr));
669 tcp_input_with_port(&m, &off, IPPROTO_TCP, port);
673 case IPV6_VERSION >> 4:
674 ip6 = mtod(m, struct ip6_hdr *);
675 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - sizeof(struct udphdr));
676 tcp6_input_with_port(&m, &off, IPPROTO_TCP, port);
691 sysctl_net_inet_default_tcp_functions(SYSCTL_HANDLER_ARGS)
694 struct tcp_function_set fs;
695 struct tcp_function_block *blk;
697 memset(&fs, 0, sizeof(fs));
698 rw_rlock(&tcp_function_lock);
699 blk = find_tcp_fb_locked(V_tcp_func_set_ptr, NULL);
702 strcpy(fs.function_set_name, blk->tfb_tcp_block_name);
703 fs.pcbcnt = blk->tfb_refcnt;
705 rw_runlock(&tcp_function_lock);
706 error = sysctl_handle_string(oidp, fs.function_set_name,
707 sizeof(fs.function_set_name), req);
709 /* Check for error or no change */
710 if (error != 0 || req->newptr == NULL)
713 rw_wlock(&tcp_function_lock);
714 blk = find_tcp_functions_locked(&fs);
716 (blk->tfb_flags & TCP_FUNC_BEING_REMOVED)) {
720 V_tcp_func_set_ptr = blk;
722 rw_wunlock(&tcp_function_lock);
726 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_default,
727 CTLFLAG_VNET | CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
728 NULL, 0, sysctl_net_inet_default_tcp_functions, "A",
729 "Set/get the default TCP functions");
732 sysctl_net_inet_list_available(SYSCTL_HANDLER_ARGS)
734 int error, cnt, linesz;
735 struct tcp_function *f;
741 rw_rlock(&tcp_function_lock);
742 TAILQ_FOREACH(f, &t_functions, tf_next) {
745 rw_runlock(&tcp_function_lock);
747 bufsz = (cnt+2) * ((TCP_FUNCTION_NAME_LEN_MAX * 2) + 13) + 1;
748 buffer = malloc(bufsz, M_TEMP, M_WAITOK);
753 linesz = snprintf(cp, bufsz, "\n%-32s%c %-32s %s\n", "Stack", 'D',
754 "Alias", "PCB count");
759 rw_rlock(&tcp_function_lock);
760 TAILQ_FOREACH(f, &t_functions, tf_next) {
761 alias = (f->tf_name != f->tf_fb->tfb_tcp_block_name);
762 linesz = snprintf(cp, bufsz, "%-32s%c %-32s %u\n",
763 f->tf_fb->tfb_tcp_block_name,
764 (f->tf_fb == V_tcp_func_set_ptr) ? '*' : ' ',
765 alias ? f->tf_name : "-",
766 f->tf_fb->tfb_refcnt);
767 if (linesz >= bufsz) {
775 rw_runlock(&tcp_function_lock);
777 error = sysctl_handle_string(oidp, buffer, outsz + 1, req);
778 free(buffer, M_TEMP);
782 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_available,
783 CTLFLAG_VNET | CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
784 NULL, 0, sysctl_net_inet_list_available, "A",
785 "list available TCP Function sets");
787 VNET_DEFINE(int, tcp_udp_tunneling_port) = TCP_TUNNELING_PORT_DEFAULT;
790 VNET_DEFINE(struct socket *, udp4_tun_socket) = NULL;
791 #define V_udp4_tun_socket VNET(udp4_tun_socket)
794 VNET_DEFINE(struct socket *, udp6_tun_socket) = NULL;
795 #define V_udp6_tun_socket VNET(udp6_tun_socket)
798 static struct sx tcpoudp_lock;
801 tcp_over_udp_stop(void)
804 sx_assert(&tcpoudp_lock, SA_XLOCKED);
807 if (V_udp4_tun_socket != NULL) {
808 soclose(V_udp4_tun_socket);
809 V_udp4_tun_socket = NULL;
813 if (V_udp6_tun_socket != NULL) {
814 soclose(V_udp6_tun_socket);
815 V_udp6_tun_socket = NULL;
821 tcp_over_udp_start(void)
826 struct sockaddr_in sin;
829 struct sockaddr_in6 sin6;
832 sx_assert(&tcpoudp_lock, SA_XLOCKED);
834 port = V_tcp_udp_tunneling_port;
835 if (ntohs(port) == 0) {
836 /* Must have a port set */
840 if (V_udp4_tun_socket != NULL) {
841 /* Already running -- must stop first */
846 if (V_udp6_tun_socket != NULL) {
847 /* Already running -- must stop first */
852 if ((ret = socreate(PF_INET, &V_udp4_tun_socket,
853 SOCK_DGRAM, IPPROTO_UDP,
854 curthread->td_ucred, curthread))) {
858 /* Call the special UDP hook. */
859 if ((ret = udp_set_kernel_tunneling(V_udp4_tun_socket,
860 tcp_recv_udp_tunneled_packet,
866 /* Ok, we have a socket, bind it to the port. */
867 memset(&sin, 0, sizeof(struct sockaddr_in));
868 sin.sin_len = sizeof(struct sockaddr_in);
869 sin.sin_family = AF_INET;
870 sin.sin_port = htons(port);
871 if ((ret = sobind(V_udp4_tun_socket,
872 (struct sockaddr *)&sin, curthread))) {
878 if ((ret = socreate(PF_INET6, &V_udp6_tun_socket,
879 SOCK_DGRAM, IPPROTO_UDP,
880 curthread->td_ucred, curthread))) {
884 /* Call the special UDP hook. */
885 if ((ret = udp_set_kernel_tunneling(V_udp6_tun_socket,
886 tcp_recv_udp_tunneled_packet,
887 tcp6_ctlinput_viaudp,
892 /* Ok, we have a socket, bind it to the port. */
893 memset(&sin6, 0, sizeof(struct sockaddr_in6));
894 sin6.sin6_len = sizeof(struct sockaddr_in6);
895 sin6.sin6_family = AF_INET6;
896 sin6.sin6_port = htons(port);
897 if ((ret = sobind(V_udp6_tun_socket,
898 (struct sockaddr *)&sin6, curthread))) {
907 sysctl_net_inet_tcp_udp_tunneling_port_check(SYSCTL_HANDLER_ARGS)
912 old = V_tcp_udp_tunneling_port;
914 error = sysctl_handle_int(oidp, &new, 0, req);
916 (req->newptr != NULL)) {
917 if ((new < TCP_TUNNELING_PORT_MIN) ||
918 (new > TCP_TUNNELING_PORT_MAX)) {
921 sx_xlock(&tcpoudp_lock);
922 V_tcp_udp_tunneling_port = new;
927 error = tcp_over_udp_start();
929 V_tcp_udp_tunneling_port = 0;
932 sx_xunlock(&tcpoudp_lock);
938 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, udp_tunneling_port,
939 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
940 &VNET_NAME(tcp_udp_tunneling_port),
941 0, &sysctl_net_inet_tcp_udp_tunneling_port_check, "IU",
942 "Tunneling port for tcp over udp");
944 VNET_DEFINE(int, tcp_udp_tunneling_overhead) = TCP_TUNNELING_OVERHEAD_DEFAULT;
947 sysctl_net_inet_tcp_udp_tunneling_overhead_check(SYSCTL_HANDLER_ARGS)
951 new = V_tcp_udp_tunneling_overhead;
952 error = sysctl_handle_int(oidp, &new, 0, req);
953 if (error == 0 && req->newptr) {
954 if ((new < TCP_TUNNELING_OVERHEAD_MIN) ||
955 (new > TCP_TUNNELING_OVERHEAD_MAX))
958 V_tcp_udp_tunneling_overhead = new;
963 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, udp_tunneling_overhead,
964 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
965 &VNET_NAME(tcp_udp_tunneling_overhead),
966 0, &sysctl_net_inet_tcp_udp_tunneling_overhead_check, "IU",
967 "MSS reduction when using tcp over udp");
970 * Exports one (struct tcp_function_info) for each alias/name.
973 sysctl_net_inet_list_func_info(SYSCTL_HANDLER_ARGS)
976 struct tcp_function *f;
977 struct tcp_function_info tfi;
980 * We don't allow writes.
982 if (req->newptr != NULL)
986 * Wire the old buffer so we can directly copy the functions to
987 * user space without dropping the lock.
989 if (req->oldptr != NULL) {
990 error = sysctl_wire_old_buffer(req, 0);
996 * Walk the list and copy out matching entries. If INVARIANTS
997 * is compiled in, also walk the list to verify the length of
998 * the list matches what we have recorded.
1000 rw_rlock(&tcp_function_lock);
1004 if (req->oldptr == NULL) {
1009 TAILQ_FOREACH(f, &t_functions, tf_next) {
1013 if (req->oldptr != NULL) {
1014 bzero(&tfi, sizeof(tfi));
1015 tfi.tfi_refcnt = f->tf_fb->tfb_refcnt;
1016 tfi.tfi_id = f->tf_fb->tfb_id;
1017 (void)strlcpy(tfi.tfi_alias, f->tf_name,
1018 sizeof(tfi.tfi_alias));
1019 (void)strlcpy(tfi.tfi_name,
1020 f->tf_fb->tfb_tcp_block_name, sizeof(tfi.tfi_name));
1021 error = SYSCTL_OUT(req, &tfi, sizeof(tfi));
1023 * Don't stop on error, as that is the
1024 * mechanism we use to accumulate length
1025 * information if the buffer was too short.
1029 KASSERT(cnt == tcp_fb_cnt,
1030 ("%s: cnt (%d) != tcp_fb_cnt (%d)", __func__, cnt, tcp_fb_cnt));
1034 rw_runlock(&tcp_function_lock);
1035 if (req->oldptr == NULL)
1036 error = SYSCTL_OUT(req, NULL,
1037 (cnt + 1) * sizeof(struct tcp_function_info));
1042 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, function_info,
1043 CTLTYPE_OPAQUE | CTLFLAG_SKIP | CTLFLAG_RD | CTLFLAG_MPSAFE,
1044 NULL, 0, sysctl_net_inet_list_func_info, "S,tcp_function_info",
1045 "List TCP function block name-to-ID mappings");
1048 * tfb_tcp_handoff_ok() function for the default stack.
1049 * Note that we'll basically try to take all comers.
1052 tcp_default_handoff_ok(struct tcpcb *tp)
1059 * tfb_tcp_fb_init() function for the default stack.
1061 * This handles making sure we have appropriate timers set if you are
1062 * transitioning a socket that has some amount of setup done.
1064 * The init() fuction from the default can *never* return non-zero i.e.
1065 * it is required to always succeed since it is the stack of last resort!
1068 tcp_default_fb_init(struct tcpcb *tp, void **ptr)
1070 struct socket *so = tptosocket(tp);
1073 INP_WLOCK_ASSERT(tptoinpcb(tp));
1074 /* We don't use the pointer */
1077 KASSERT(tp->t_state >= 0 && tp->t_state < TCPS_TIME_WAIT,
1078 ("%s: connection %p in unexpected state %d", __func__, tp,
1081 /* Make sure we get no interesting mbuf queuing behavior */
1082 /* All mbuf queue/ack compress flags should be off */
1083 tcp_lro_features_off(tp);
1085 /* Cancel the GP measurement in progress */
1086 tp->t_flags &= ~TF_GPUTINPROG;
1087 /* Validate the timers are not in usec, if they are convert */
1088 tcp_change_time_units(tp, TCP_TMR_GRANULARITY_TICKS);
1089 if ((tp->t_state == TCPS_SYN_SENT) ||
1090 (tp->t_state == TCPS_SYN_RECEIVED))
1091 rexmt = tcp_rexmit_initial * tcp_backoff[tp->t_rxtshift];
1093 rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift];
1094 if (tp->t_rxtshift == 0)
1095 tp->t_rxtcur = rexmt;
1097 TCPT_RANGESET(tp->t_rxtcur, rexmt, tp->t_rttmin, TCPTV_REXMTMAX);
1100 * Nothing to do for ESTABLISHED or LISTEN states. And, we don't
1101 * know what to do for unexpected states (which includes TIME_WAIT).
1103 if (tp->t_state <= TCPS_LISTEN || tp->t_state >= TCPS_TIME_WAIT)
1107 * Make sure some kind of transmission timer is set if there is
1110 if ((!TCPS_HAVEESTABLISHED(tp->t_state) || sbavail(&so->so_snd) ||
1111 tp->snd_una != tp->snd_max) && !(tcp_timer_active(tp, TT_REXMT) ||
1112 tcp_timer_active(tp, TT_PERSIST))) {
1114 * If the session has established and it looks like it should
1115 * be in the persist state, set the persist timer. Otherwise,
1116 * set the retransmit timer.
1118 if (TCPS_HAVEESTABLISHED(tp->t_state) && tp->snd_wnd == 0 &&
1119 (int32_t)(tp->snd_nxt - tp->snd_una) <
1120 (int32_t)sbavail(&so->so_snd))
1123 tcp_timer_activate(tp, TT_REXMT, TP_RXTCUR(tp));
1126 /* All non-embryonic sessions get a keepalive timer. */
1127 if (!tcp_timer_active(tp, TT_KEEP))
1128 tcp_timer_activate(tp, TT_KEEP,
1129 TCPS_HAVEESTABLISHED(tp->t_state) ? TP_KEEPIDLE(tp) :
1133 * Make sure critical variables are initialized
1134 * if transitioning while in Recovery.
1136 if IN_FASTRECOVERY(tp->t_flags) {
1137 if (tp->sackhint.recover_fs == 0)
1138 tp->sackhint.recover_fs = max(1,
1139 tp->snd_nxt - tp->snd_una);
1146 * tfb_tcp_fb_fini() function for the default stack.
1148 * This changes state as necessary (or prudent) to prepare for another stack
1149 * to assume responsibility for the connection.
1152 tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged)
1155 INP_WLOCK_ASSERT(tptoinpcb(tp));
1158 tcp_log_flowend(tp);
1164 MALLOC_DEFINE(M_TCPLOG, "tcplog", "TCP address and flags print buffers");
1165 MALLOC_DEFINE(M_TCPFUNCTIONS, "tcpfunc", "TCP function set memory");
1167 static struct mtx isn_mtx;
1169 #define ISN_LOCK_INIT() mtx_init(&isn_mtx, "isn_mtx", NULL, MTX_DEF)
1170 #define ISN_LOCK() mtx_lock(&isn_mtx)
1171 #define ISN_UNLOCK() mtx_unlock(&isn_mtx)
1173 INPCBSTORAGE_DEFINE(tcpcbstor, tcpcb, "tcpinp", "tcp_inpcb", "tcp", "tcphash");
1176 * Take a value and get the next power of 2 that doesn't overflow.
1177 * Used to size the tcp_inpcb hash buckets.
1180 maketcp_hashsize(int size)
1186 * get the next power of 2 higher than maxsockets.
1188 hashsize = 1 << fls(size);
1189 /* catch overflow, and just go one power of 2 smaller */
1190 if (hashsize < size) {
1191 hashsize = 1 << (fls(size) - 1);
1196 static volatile int next_tcp_stack_id = 1;
1199 * Register a TCP function block with the name provided in the names
1200 * array. (Note that this function does NOT automatically register
1201 * blk->tfb_tcp_block_name as a stack name. Therefore, you should
1202 * explicitly include blk->tfb_tcp_block_name in the list of names if
1203 * you wish to register the stack with that name.)
1205 * Either all name registrations will succeed or all will fail. If
1206 * a name registration fails, the function will update the num_names
1207 * argument to point to the array index of the name that encountered
1210 * Returns 0 on success, or an error code on failure.
1213 register_tcp_functions_as_names(struct tcp_function_block *blk, int wait,
1214 const char *names[], int *num_names)
1216 struct tcp_function *n;
1217 struct tcp_function_set fs;
1220 KASSERT(names != NULL && *num_names > 0,
1221 ("%s: Called with 0-length name list", __func__));
1222 KASSERT(names != NULL, ("%s: Called with NULL name list", __func__));
1223 KASSERT(rw_initialized(&tcp_function_lock),
1224 ("%s: called too early", __func__));
1226 if ((blk->tfb_tcp_output == NULL) ||
1227 (blk->tfb_tcp_do_segment == NULL) ||
1228 (blk->tfb_tcp_ctloutput == NULL) ||
1229 (strlen(blk->tfb_tcp_block_name) == 0)) {
1231 * These functions are required and you
1238 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1243 refcount_init(&blk->tfb_refcnt, 0);
1244 blk->tfb_id = atomic_fetchadd_int(&next_tcp_stack_id, 1);
1245 for (i = 0; i < *num_names; i++) {
1246 n = malloc(sizeof(struct tcp_function), M_TCPFUNCTIONS, wait);
1253 (void)strlcpy(fs.function_set_name, names[i],
1254 sizeof(fs.function_set_name));
1255 rw_wlock(&tcp_function_lock);
1256 if (find_tcp_functions_locked(&fs) != NULL) {
1257 /* Duplicate name space not allowed */
1258 rw_wunlock(&tcp_function_lock);
1259 free(n, M_TCPFUNCTIONS);
1263 (void)strlcpy(n->tf_name, names[i], sizeof(n->tf_name));
1264 TAILQ_INSERT_TAIL(&t_functions, n, tf_next);
1266 rw_wunlock(&tcp_function_lock);
1272 * Deregister the names we just added. Because registration failed
1273 * for names[i], we don't need to deregister that name.
1276 rw_wlock(&tcp_function_lock);
1278 TAILQ_FOREACH(n, &t_functions, tf_next) {
1279 if (!strncmp(n->tf_name, names[i],
1280 TCP_FUNCTION_NAME_LEN_MAX)) {
1281 TAILQ_REMOVE(&t_functions, n, tf_next);
1284 free(n, M_TCPFUNCTIONS);
1289 rw_wunlock(&tcp_function_lock);
1294 * Register a TCP function block using the name provided in the name
1297 * Returns 0 on success, or an error code on failure.
1300 register_tcp_functions_as_name(struct tcp_function_block *blk, const char *name,
1303 const char *name_list[1];
1308 name_list[0] = name;
1310 name_list[0] = blk->tfb_tcp_block_name;
1311 rv = register_tcp_functions_as_names(blk, wait, name_list, &num_names);
1316 * Register a TCP function block using the name defined in
1317 * blk->tfb_tcp_block_name.
1319 * Returns 0 on success, or an error code on failure.
1322 register_tcp_functions(struct tcp_function_block *blk, int wait)
1325 return (register_tcp_functions_as_name(blk, NULL, wait));
1329 * Deregister all names associated with a function block. This
1330 * functionally removes the function block from use within the system.
1332 * When called with a true quiesce argument, mark the function block
1333 * as being removed so no more stacks will use it and determine
1334 * whether the removal would succeed.
1336 * When called with a false quiesce argument, actually attempt the
1339 * When called with a force argument, attempt to switch all TCBs to
1340 * use the default stack instead of returning EBUSY.
1342 * Returns 0 on success (or if the removal would succeed), or an error
1346 deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce,
1349 struct tcp_function *f;
1350 VNET_ITERATOR_DECL(vnet_iter);
1352 if (blk == &tcp_def_funcblk) {
1353 /* You can't un-register the default */
1356 rw_wlock(&tcp_function_lock);
1357 VNET_LIST_RLOCK_NOSLEEP();
1358 VNET_FOREACH(vnet_iter) {
1359 CURVNET_SET(vnet_iter);
1360 if (blk == V_tcp_func_set_ptr) {
1361 /* You can't free the current default in some vnet. */
1363 VNET_LIST_RUNLOCK_NOSLEEP();
1364 rw_wunlock(&tcp_function_lock);
1369 VNET_LIST_RUNLOCK_NOSLEEP();
1370 /* Mark the block so no more stacks can use it. */
1371 blk->tfb_flags |= TCP_FUNC_BEING_REMOVED;
1373 * If TCBs are still attached to the stack, attempt to switch them
1374 * to the default stack.
1376 if (force && blk->tfb_refcnt) {
1379 VNET_ITERATOR_DECL(vnet_iter);
1381 rw_wunlock(&tcp_function_lock);
1384 VNET_FOREACH(vnet_iter) {
1385 CURVNET_SET(vnet_iter);
1386 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_tcbinfo,
1387 INPLOOKUP_WLOCKPCB);
1389 while ((inp = inp_next(&inpi)) != NULL) {
1390 tp = intotcpcb(inp);
1391 if (tp == NULL || tp->t_fb != blk)
1393 tcp_switch_back_to_default(tp);
1397 VNET_LIST_RUNLOCK();
1399 rw_wlock(&tcp_function_lock);
1401 if (blk->tfb_refcnt) {
1402 /* TCBs still attached. */
1403 rw_wunlock(&tcp_function_lock);
1408 rw_wunlock(&tcp_function_lock);
1411 /* Remove any function names that map to this function block. */
1412 while (find_tcp_fb_locked(blk, &f) != NULL) {
1413 TAILQ_REMOVE(&t_functions, f, tf_next);
1416 free(f, M_TCPFUNCTIONS);
1418 rw_wunlock(&tcp_function_lock);
1425 struct epoch_tracker et;
1426 VNET_ITERATOR_DECL(vnet_iter);
1431 NET_EPOCH_ENTER(et);
1432 VNET_LIST_RLOCK_NOSLEEP();
1433 VNET_FOREACH(vnet_iter) {
1434 CURVNET_SET(vnet_iter);
1435 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_tcbinfo,
1436 INPLOOKUP_WLOCKPCB);
1441 * Walk the tcpbs, if existing, and flush the reassembly queue,
1442 * if there is one...
1443 * XXX: The "Net/3" implementation doesn't imply that the TCP
1444 * reassembly queue should be flushed, but in a situation
1445 * where we're really low on mbufs, this is potentially
1448 while ((inpb = inp_next(&inpi)) != NULL) {
1449 if ((tcpb = intotcpcb(inpb)) != NULL) {
1450 tcp_reass_flush(tcpb);
1451 tcp_clean_sackreport(tcpb);
1453 tcp_log_drain(tcpb);
1456 if (tcp_pcap_aggressive_free) {
1457 /* Free the TCP PCAP queues. */
1458 tcp_pcap_drain(&(tcpb->t_inpkts));
1459 tcp_pcap_drain(&(tcpb->t_outpkts));
1466 VNET_LIST_RUNLOCK_NOSLEEP();
1471 tcp_vnet_init(void *arg __unused)
1475 if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN,
1476 &V_tcp_hhh[HHOOK_TCP_EST_IN], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
1477 printf("%s: WARNING: unable to register helper hook\n", __func__);
1478 if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT,
1479 &V_tcp_hhh[HHOOK_TCP_EST_OUT], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
1480 printf("%s: WARNING: unable to register helper hook\n", __func__);
1483 if (tcp_stats_init())
1484 printf("%s: WARNING: unable to initialise TCP stats\n",
1487 in_pcbinfo_init(&V_tcbinfo, &tcpcbstor, tcp_tcbhashsize,
1493 TUNABLE_INT_FETCH("net.inet.tcp.sack.enable", &V_tcp_do_sack);
1494 V_sack_hole_zone = uma_zcreate("sackhole", sizeof(struct sackhole),
1495 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
1497 tcp_fastopen_init();
1499 COUNTER_ARRAY_ALLOC(V_tcps_states, TCP_NSTATES, M_WAITOK);
1500 VNET_PCPUSTAT_ALLOC(tcpstat, M_WAITOK);
1502 V_tcp_msl = TCPTV_MSL;
1504 VNET_SYSINIT(tcp_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH,
1505 tcp_vnet_init, NULL);
1508 tcp_init(void *arg __unused)
1512 tcp_reass_global_init();
1514 /* XXX virtualize those below? */
1515 tcp_delacktime = TCPTV_DELACK;
1516 tcp_keepinit = TCPTV_KEEP_INIT;
1517 tcp_keepidle = TCPTV_KEEP_IDLE;
1518 tcp_keepintvl = TCPTV_KEEPINTVL;
1519 tcp_maxpersistidle = TCPTV_KEEP_IDLE;
1520 tcp_rexmit_initial = TCPTV_RTOBASE;
1521 if (tcp_rexmit_initial < 1)
1522 tcp_rexmit_initial = 1;
1523 tcp_rexmit_min = TCPTV_MIN;
1524 if (tcp_rexmit_min < 1)
1526 tcp_persmin = TCPTV_PERSMIN;
1527 tcp_persmax = TCPTV_PERSMAX;
1528 tcp_rexmit_slop = TCPTV_CPU_VAR;
1529 tcp_finwait2_timeout = TCPTV_FINWAIT2_TIMEOUT;
1531 /* Setup the tcp function block list */
1532 TAILQ_INIT(&t_functions);
1533 rw_init(&tcp_function_lock, "tcp_func_lock");
1534 register_tcp_functions(&tcp_def_funcblk, M_WAITOK);
1535 sx_init(&tcpoudp_lock, "TCP over UDP configuration");
1537 /* Initialize the TCP logging data. */
1540 arc4rand(&V_ts_offset_secret, sizeof(V_ts_offset_secret), 0);
1542 if (tcp_soreceive_stream) {
1544 tcp_protosw.pr_soreceive = soreceive_stream;
1547 tcp6_protosw.pr_soreceive = soreceive_stream;
1552 max_protohdr_grow(sizeof(struct ip6_hdr) + sizeof(struct tcphdr));
1554 max_protohdr_grow(sizeof(struct tcpiphdr));
1558 EVENTHANDLER_REGISTER(shutdown_pre_sync, tcp_fini, NULL,
1559 SHUTDOWN_PRI_DEFAULT);
1560 EVENTHANDLER_REGISTER(vm_lowmem, tcp_drain, NULL, LOWMEM_PRI_DEFAULT);
1561 EVENTHANDLER_REGISTER(mbuf_lowmem, tcp_drain, NULL, LOWMEM_PRI_DEFAULT);
1563 tcp_inp_lro_direct_queue = counter_u64_alloc(M_WAITOK);
1564 tcp_inp_lro_wokeup_queue = counter_u64_alloc(M_WAITOK);
1565 tcp_inp_lro_compressed = counter_u64_alloc(M_WAITOK);
1566 tcp_inp_lro_locks_taken = counter_u64_alloc(M_WAITOK);
1567 tcp_extra_mbuf = counter_u64_alloc(M_WAITOK);
1568 tcp_would_have_but = counter_u64_alloc(M_WAITOK);
1569 tcp_comp_total = counter_u64_alloc(M_WAITOK);
1570 tcp_uncomp_total = counter_u64_alloc(M_WAITOK);
1571 tcp_bad_csums = counter_u64_alloc(M_WAITOK);
1572 tcp_pacing_failures = counter_u64_alloc(M_WAITOK);
1577 hashsize = tcp_tcbhashsize;
1578 if (hashsize == 0) {
1580 * Auto tune the hash size based on maxsockets.
1581 * A perfect hash would have a 1:1 mapping
1582 * (hashsize = maxsockets) however it's been
1583 * suggested that O(2) average is better.
1585 hashsize = maketcp_hashsize(maxsockets / 4);
1587 * Our historical default is 512,
1588 * do not autotune lower than this.
1593 printf("%s: %s auto tuned to %d\n", __func__,
1594 "net.inet.tcp.tcbhashsize", hashsize);
1597 * We require a hashsize to be a power of two.
1598 * Previously if it was not a power of two we would just reset it
1599 * back to 512, which could be a nasty surprise if you did not notice
1600 * the error message.
1601 * Instead what we do is clip it to the closest power of two lower
1602 * than the specified hash value.
1604 if (!powerof2(hashsize)) {
1605 int oldhashsize = hashsize;
1607 hashsize = maketcp_hashsize(hashsize);
1608 /* prevent absurdly low value */
1611 printf("%s: WARNING: TCB hash size not a power of 2, "
1612 "clipped from %d to %d.\n", __func__, oldhashsize,
1615 tcp_tcbhashsize = hashsize;
1618 IPPROTO_REGISTER(IPPROTO_TCP, tcp_input, tcp_ctlinput);
1621 IP6PROTO_REGISTER(IPPROTO_TCP, tcp6_input, tcp6_ctlinput);
1624 SYSINIT(tcp_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, tcp_init, NULL);
1628 tcp_destroy(void *unused __unused)
1636 * All our processes are gone, all our sockets should be cleaned
1637 * up, which means, we should be past the tcp_discardcb() calls.
1638 * Sleep to let all tcpcb timers really disappear and cleanup.
1641 INP_INFO_WLOCK(&V_tcbinfo);
1642 n = V_tcbinfo.ipi_count;
1643 INP_INFO_WUNLOCK(&V_tcbinfo);
1646 pause("tcpdes", hz / 10);
1650 in_pcbinfo_destroy(&V_tcbinfo);
1651 /* tcp_discardcb() clears the sack_holes up. */
1652 uma_zdestroy(V_sack_hole_zone);
1655 * Cannot free the zone until all tcpcbs are released as we attach
1656 * the allocations to them.
1658 tcp_fastopen_destroy();
1660 COUNTER_ARRAY_FREE(V_tcps_states, TCP_NSTATES);
1661 VNET_PCPUSTAT_FREE(tcpstat);
1664 error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_IN]);
1666 printf("%s: WARNING: unable to deregister helper hook "
1667 "type=%d, id=%d: error %d returned\n", __func__,
1668 HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN, error);
1670 error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_OUT]);
1672 printf("%s: WARNING: unable to deregister helper hook "
1673 "type=%d, id=%d: error %d returned\n", __func__,
1674 HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT, error);
1678 VNET_SYSUNINIT(tcp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, tcp_destroy, NULL);
1688 * Fill in the IP and TCP headers for an outgoing packet, given the tcpcb.
1689 * tcp_template used to store this data in mbufs, but we now recopy it out
1690 * of the tcpcb each time to conserve mbufs.
1693 tcpip_fillheaders(struct inpcb *inp, uint16_t port, void *ip_ptr, void *tcp_ptr)
1695 struct tcphdr *th = (struct tcphdr *)tcp_ptr;
1697 INP_WLOCK_ASSERT(inp);
1700 if ((inp->inp_vflag & INP_IPV6) != 0) {
1701 struct ip6_hdr *ip6;
1703 ip6 = (struct ip6_hdr *)ip_ptr;
1704 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
1705 (inp->inp_flow & IPV6_FLOWINFO_MASK);
1706 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
1707 (IPV6_VERSION & IPV6_VERSION_MASK);
1709 ip6->ip6_nxt = IPPROTO_TCP;
1711 ip6->ip6_nxt = IPPROTO_UDP;
1712 ip6->ip6_plen = htons(sizeof(struct tcphdr));
1713 ip6->ip6_src = inp->in6p_laddr;
1714 ip6->ip6_dst = inp->in6p_faddr;
1717 #if defined(INET6) && defined(INET)
1724 ip = (struct ip *)ip_ptr;
1725 ip->ip_v = IPVERSION;
1727 ip->ip_tos = inp->inp_ip_tos;
1731 ip->ip_ttl = inp->inp_ip_ttl;
1734 ip->ip_p = IPPROTO_TCP;
1736 ip->ip_p = IPPROTO_UDP;
1737 ip->ip_src = inp->inp_laddr;
1738 ip->ip_dst = inp->inp_faddr;
1741 th->th_sport = inp->inp_lport;
1742 th->th_dport = inp->inp_fport;
1746 tcp_set_flags(th, 0);
1749 th->th_sum = 0; /* in_pseudo() is called later for ipv4 */
1753 * Create template to be used to send tcp packets on a connection.
1754 * Allocates an mbuf and fills in a skeletal tcp/ip header. The only
1755 * use for this function is in keepalives, which use tcp_respond.
1758 tcpip_maketemplate(struct inpcb *inp)
1762 t = malloc(sizeof(*t), M_TEMP, M_NOWAIT);
1765 tcpip_fillheaders(inp, 0, (void *)&t->tt_ipgen, (void *)&t->tt_t);
1770 * Send a single message to the TCP at address specified by
1771 * the given TCP/IP header. If m == NULL, then we make a copy
1772 * of the tcpiphdr at th and send directly to the addressed host.
1773 * This is used to force keep alive messages out using the TCP
1774 * template for a connection. If flags are given then we send
1775 * a message back to the TCP which originated the segment th,
1776 * and discard the mbuf containing it and any other attached mbufs.
1778 * In any case the ack and sequence number of the transmitted
1779 * segment are as specified by the parameters.
1781 * NOTE: If m != NULL, then th must point to *inside* the mbuf.
1784 tcp_respond(struct tcpcb *tp, void *ipgen, struct tcphdr *th, struct mbuf *m,
1785 tcp_seq ack, tcp_seq seq, uint16_t flags)
1791 struct udphdr *uh = NULL;
1793 struct tcp_log_buffer *lgb;
1796 struct ip6_hdr *ip6;
1799 int optlen, tlen, win, ulen;
1805 int thflags = tcp_get_flags(th);
1808 KASSERT(tp != NULL || m != NULL, ("tcp_respond: tp and m both NULL"));
1812 isipv6 = ((struct ip *)ipgen)->ip_v == (IPV6_VERSION >> 4);
1818 inp = tptoinpcb(tp);
1819 INP_LOCK_ASSERT(inp);
1825 if (isipv6 && ip6 && (ip6->ip6_nxt == IPPROTO_UDP))
1826 port = m->m_pkthdr.tcp_tun_port;
1829 if (ip && (ip->ip_p == IPPROTO_UDP))
1830 port = m->m_pkthdr.tcp_tun_port;
1839 if (!(flags & TH_RST)) {
1840 win = sbspace(&inp->inp_socket->so_rcv);
1841 if (win > TCP_MAXWIN << tp->rcv_scale)
1842 win = TCP_MAXWIN << tp->rcv_scale;
1844 if ((tp->t_flags & TF_NOOPT) == 0)
1848 m = m_gethdr(M_NOWAIT, MT_DATA);
1851 m->m_data += max_linkhdr;
1854 bcopy((caddr_t)ip6, mtod(m, caddr_t),
1855 sizeof(struct ip6_hdr));
1856 ip6 = mtod(m, struct ip6_hdr *);
1857 nth = (struct tcphdr *)(ip6 + 1);
1859 /* Insert a UDP header */
1860 uh = (struct udphdr *)nth;
1861 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1862 uh->uh_dport = port;
1863 nth = (struct tcphdr *)(uh + 1);
1868 bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
1869 ip = mtod(m, struct ip *);
1870 nth = (struct tcphdr *)(ip + 1);
1872 /* Insert a UDP header */
1873 uh = (struct udphdr *)nth;
1874 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1875 uh->uh_dport = port;
1876 nth = (struct tcphdr *)(uh + 1);
1879 bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
1881 } else if ((!M_WRITABLE(m)) || (port != 0)) {
1884 /* Can't reuse 'm', allocate a new mbuf. */
1885 n = m_gethdr(M_NOWAIT, MT_DATA);
1891 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
1897 n->m_data += max_linkhdr;
1898 /* m_len is set later */
1899 #define xchg(a,b,type) { type t; t=a; a=b; b=t; }
1902 bcopy((caddr_t)ip6, mtod(n, caddr_t),
1903 sizeof(struct ip6_hdr));
1904 ip6 = mtod(n, struct ip6_hdr *);
1905 xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
1906 nth = (struct tcphdr *)(ip6 + 1);
1908 /* Insert a UDP header */
1909 uh = (struct udphdr *)nth;
1910 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1911 uh->uh_dport = port;
1912 nth = (struct tcphdr *)(uh + 1);
1917 bcopy((caddr_t)ip, mtod(n, caddr_t), sizeof(struct ip));
1918 ip = mtod(n, struct ip *);
1919 xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t);
1920 nth = (struct tcphdr *)(ip + 1);
1922 /* Insert a UDP header */
1923 uh = (struct udphdr *)nth;
1924 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1925 uh->uh_dport = port;
1926 nth = (struct tcphdr *)(uh + 1);
1929 bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
1930 xchg(nth->th_dport, nth->th_sport, uint16_t);
1937 * XXX MRT We inherit the FIB, which is lucky.
1941 m->m_data = (caddr_t)ipgen;
1942 /* clear any receive flags for proper bpf timestamping */
1943 m->m_flags &= ~(M_TSTMP | M_TSTMP_LRO);
1944 /* m_len is set later */
1947 xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
1948 nth = (struct tcphdr *)(ip6 + 1);
1952 xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t);
1953 nth = (struct tcphdr *)(ip + 1);
1957 * this is usually a case when an extension header
1958 * exists between the IPv6 header and the
1961 nth->th_sport = th->th_sport;
1962 nth->th_dport = th->th_dport;
1964 xchg(nth->th_dport, nth->th_sport, uint16_t);
1970 tlen = sizeof (struct ip6_hdr) + sizeof (struct tcphdr);
1972 #if defined(INET) && defined(INET6)
1976 tlen = sizeof (struct tcpiphdr);
1979 tlen += sizeof (struct udphdr);
1982 KASSERT(M_TRAILINGSPACE(m) >= tlen,
1983 ("Not enough trailing space for message (m=%p, need=%d, have=%ld)",
1984 m, tlen, (long)M_TRAILINGSPACE(m)));
1989 ect = tcp_ecn_output_established(tp, &flags, 0, false);
1990 /* Make sure we have room. */
1991 if (M_TRAILINGSPACE(m) < TCP_MAXOLEN) {
1992 m->m_next = m_get(M_NOWAIT, MT_DATA);
1994 optp = mtod(m->m_next, u_char *);
1999 optp = (u_char *) (nth + 1);
2005 if (tp->t_flags & TF_RCVD_TSTMP) {
2006 to.to_tsval = tcp_ts_getticks() + tp->ts_offset;
2007 to.to_tsecr = tp->ts_recent;
2008 to.to_flags |= TOF_TS;
2010 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2011 /* TCP-MD5 (RFC2385). */
2012 if (tp->t_flags & TF_SIGNATURE)
2013 to.to_flags |= TOF_SIGNATURE;
2015 /* Add the options. */
2016 tlen += optlen = tcp_addoptions(&to, optp);
2018 /* Update m_len in the correct mbuf. */
2019 optm->m_len += optlen;
2025 ulen = tlen - sizeof(struct ip6_hdr);
2026 uh->uh_ulen = htons(ulen);
2028 ip6->ip6_flow = htonl(ect << IPV6_FLOWLABEL_LEN);
2029 ip6->ip6_vfc = IPV6_VERSION;
2031 ip6->ip6_nxt = IPPROTO_UDP;
2033 ip6->ip6_nxt = IPPROTO_TCP;
2034 ip6->ip6_plen = htons(tlen - sizeof(*ip6));
2037 #if defined(INET) && defined(INET6)
2043 ulen = tlen - sizeof(struct ip);
2044 uh->uh_ulen = htons(ulen);
2046 ip->ip_len = htons(tlen);
2048 ip->ip_tos = inp->inp_ip_tos & ~IPTOS_ECN_MASK;
2049 ip->ip_ttl = inp->inp_ip_ttl;
2052 ip->ip_ttl = V_ip_defttl;
2056 ip->ip_p = IPPROTO_UDP;
2058 ip->ip_p = IPPROTO_TCP;
2060 if (V_path_mtu_discovery)
2061 ip->ip_off |= htons(IP_DF);
2064 m->m_pkthdr.len = tlen;
2065 m->m_pkthdr.rcvif = NULL;
2069 * Packet is associated with a socket, so allow the
2070 * label of the response to reflect the socket label.
2072 INP_LOCK_ASSERT(inp);
2073 mac_inpcb_create_mbuf(inp, m);
2076 * Packet is not associated with a socket, so possibly
2077 * update the label in place.
2079 mac_netinet_tcp_reply(m);
2082 nth->th_seq = htonl(seq);
2083 nth->th_ack = htonl(ack);
2084 nth->th_off = (sizeof (struct tcphdr) + optlen) >> 2;
2085 tcp_set_flags(nth, flags);
2086 if (tp && (flags & TH_RST)) {
2088 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST);
2091 nth->th_win = htons((u_short) (win >> tp->rcv_scale));
2093 nth->th_win = htons((u_short)win);
2096 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
2097 if (to.to_flags & TOF_SIGNATURE) {
2098 if (!TCPMD5_ENABLED() ||
2099 TCPMD5_OUTPUT(m, nth, to.to_signature) != 0) {
2109 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
2110 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
2111 uh->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0);
2114 m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
2115 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
2116 nth->th_sum = in6_cksum_pseudo(ip6,
2117 tlen - sizeof(struct ip6_hdr), IPPROTO_TCP, 0);
2119 ip6->ip6_hlim = in6_selecthlim(inp, NULL);
2122 #if defined(INET6) && defined(INET)
2128 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
2129 htons(ulen + IPPROTO_UDP));
2130 m->m_pkthdr.csum_flags = CSUM_UDP;
2131 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
2134 m->m_pkthdr.csum_flags = CSUM_TCP;
2135 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
2136 nth->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
2137 htons((u_short)(tlen - sizeof(struct ip) + ip->ip_p)));
2141 TCP_PROBE3(debug__output, tp, th, m);
2143 TCP_PROBE5(accept__refused, NULL, NULL, m, tp, nth);
2145 if ((tp != NULL) && tcp_bblogging_on(tp)) {
2146 if (INP_WLOCKED(inp)) {
2147 union tcp_log_stackspecific log;
2150 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
2151 log.u_bbr.inhpts = tcp_in_hpts(tp);
2152 log.u_bbr.flex8 = 4;
2153 log.u_bbr.pkts_out = tp->t_maxseg;
2154 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
2155 log.u_bbr.delivered = 0;
2156 lgb = tcp_log_event(tp, nth, NULL, NULL, TCP_LOG_OUT,
2157 ERRNO_UNK, 0, &log, false, NULL, NULL, 0, &tv);
2160 * We can not log the packet, since we only own the
2161 * read lock, but a write lock is needed. The read lock
2162 * is not upgraded to a write lock, since only getting
2163 * the read lock was done intentionally to improve the
2164 * handling of SYN flooding attacks.
2165 * This happens only for pure SYN segments received in
2166 * the initial CLOSED state, or received in a more
2167 * advanced state than listen and the UDP encapsulation
2168 * port is unexpected.
2169 * The incoming SYN segments do not really belong to
2170 * the TCP connection and the handling does not change
2171 * the state of the TCP connection. Therefore, the
2172 * sending of the RST segments is not logged. Please
2173 * note that also the incoming SYN segments are not
2176 * The following code ensures that the above description
2177 * is and stays correct.
2179 KASSERT((thflags & (TH_ACK|TH_SYN)) == TH_SYN &&
2180 (tp->t_state == TCPS_CLOSED ||
2181 (tp->t_state > TCPS_LISTEN && tp->t_port != port)),
2182 ("%s: Logging of TCP segment with flags 0x%b and "
2183 "UDP encapsulation port %u skipped in state %s",
2184 __func__, thflags, PRINT_TH_FLAGS,
2185 ntohs(port), tcpstates[tp->t_state]));
2190 TCPSTAT_INC(tcps_sndacks);
2191 else if (flags & (TH_SYN|TH_FIN|TH_RST))
2192 TCPSTAT_INC(tcps_sndctrl);
2193 TCPSTAT_INC(tcps_sndtotal);
2197 TCP_PROBE5(send, NULL, tp, ip6, tp, nth);
2198 output_ret = ip6_output(m, inp ? inp->in6p_outputopts : NULL,
2199 NULL, 0, NULL, NULL, inp);
2202 #if defined(INET) && defined(INET6)
2207 TCP_PROBE5(send, NULL, tp, ip, tp, nth);
2208 output_ret = ip_output(m, NULL, NULL, 0, NULL, inp);
2212 lgb->tlb_errno = output_ret;
2216 * Create a new TCP control block, making an empty reassembly queue and hooking
2217 * it to the argument protocol control block. The `inp' parameter must have
2218 * come from the zone allocator set up by tcpcbstor declaration.
2221 tcp_newtcpcb(struct inpcb *inp)
2223 struct tcpcb *tp = intotcpcb(inp);
2225 int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
2229 * Historically allocation was done with M_ZERO. There is a lot of
2230 * code that rely on that. For now take safe approach and zero whole
2231 * tcpcb. This definitely can be optimized.
2233 bzero(&tp->t_start_zero, t_zero_size);
2235 /* Initialise cc_var struct for this tcpcb. */
2236 tp->t_ccv.type = IPPROTO_TCP;
2237 tp->t_ccv.ccvc.tcp = tp;
2238 rw_rlock(&tcp_function_lock);
2239 tp->t_fb = V_tcp_func_set_ptr;
2240 refcount_acquire(&tp->t_fb->tfb_refcnt);
2241 rw_runlock(&tcp_function_lock);
2243 * Use the current system default CC algorithm.
2245 cc_attach(tp, CC_DEFAULT_ALGO());
2247 if (CC_ALGO(tp)->cb_init != NULL)
2248 if (CC_ALGO(tp)->cb_init(&tp->t_ccv, NULL) > 0) {
2250 if (tp->t_fb->tfb_tcp_fb_fini)
2251 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
2252 refcount_release(&tp->t_fb->tfb_refcnt);
2257 if (khelp_init_osd(HELPER_CLASS_TCP, &tp->t_osd)) {
2258 if (tp->t_fb->tfb_tcp_fb_fini)
2259 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
2260 refcount_release(&tp->t_fb->tfb_refcnt);
2265 TAILQ_INIT(&tp->t_segq);
2266 STAILQ_INIT(&tp->t_inqueue);
2269 isipv6 ? V_tcp_v6mssdflt :
2273 /* All mbuf queue/ack compress flags should be off */
2274 tcp_lro_features_off(tp);
2276 callout_init_rw(&tp->t_callout, &inp->inp_lock, CALLOUT_RETURNUNLOCKED);
2277 for (int i = 0; i < TT_N; i++)
2278 tp->t_timers[i] = SBT_MAX;
2280 switch (V_tcp_do_rfc1323) {
2285 tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP);
2288 tp->t_flags = TF_REQ_SCALE;
2291 tp->t_flags = TF_REQ_TSTMP;
2295 tp->t_flags |= TF_SACK_PERMIT;
2296 TAILQ_INIT(&tp->snd_holes);
2299 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
2300 * rtt estimate. Set rttvar so that srtt + 4 * rttvar gives
2301 * reasonable initial retransmit time.
2303 tp->t_srtt = TCPTV_SRTTBASE;
2304 tp->t_rttvar = ((tcp_rexmit_initial - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4;
2305 tp->t_rttmin = tcp_rexmit_min;
2306 tp->t_rxtcur = tcp_rexmit_initial;
2307 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
2308 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
2309 tp->t_rcvtime = ticks;
2310 /* We always start with ticks granularity */
2311 tp->t_tmr_granularity = TCP_TMR_GRANULARITY_TICKS;
2313 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
2314 * because the socket may be bound to an IPv6 wildcard address,
2315 * which may match an IPv4-mapped IPv6 address.
2317 inp->inp_ip_ttl = V_ip_defttl;
2323 * Init the TCP PCAP queues.
2325 tcp_pcap_tcpcb_init(tp);
2328 /* Initialize the per-TCPCB log data. */
2329 tcp_log_tcpcbinit(tp);
2331 tp->t_pacing_rate = -1;
2332 if (tp->t_fb->tfb_tcp_fb_init) {
2333 if ((*tp->t_fb->tfb_tcp_fb_init)(tp, &tp->t_fb_ptr)) {
2334 refcount_release(&tp->t_fb->tfb_refcnt);
2339 if (V_tcp_perconn_stats_enable == 1)
2340 tp->t_stats = stats_blob_alloc(V_tcp_perconn_stats_dflt_tpl, 0);
2343 tp->t_flags |= TF_LRD;
2349 * Drop a TCP connection, reporting
2350 * the specified error. If connection is synchronized,
2351 * then send a RST to peer.
2354 tcp_drop(struct tcpcb *tp, int errno)
2356 struct socket *so = tptosocket(tp);
2359 INP_WLOCK_ASSERT(tptoinpcb(tp));
2361 if (TCPS_HAVERCVDSYN(tp->t_state)) {
2362 tcp_state_change(tp, TCPS_CLOSED);
2363 /* Don't use tcp_output() here due to possible recursion. */
2364 (void)tcp_output_nodrop(tp);
2365 TCPSTAT_INC(tcps_drops);
2367 TCPSTAT_INC(tcps_conndrops);
2368 if (errno == ETIMEDOUT && tp->t_softerror)
2369 errno = tp->t_softerror;
2370 so->so_error = errno;
2371 return (tcp_close(tp));
2375 tcp_discardcb(struct tcpcb *tp)
2377 struct inpcb *inp = tptoinpcb(tp);
2378 struct socket *so = tptosocket(tp);
2381 bool isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
2384 INP_WLOCK_ASSERT(inp);
2387 if (tp->t_fb->tfb_tcp_timer_stop_all) {
2388 tp->t_fb->tfb_tcp_timer_stop_all(tp);
2391 /* free the reassembly queue, if any */
2392 tcp_reass_flush(tp);
2395 /* Disconnect offload device, if any. */
2396 if (tp->t_flags & TF_TOE)
2397 tcp_offload_detach(tp);
2400 tcp_free_sackholes(tp);
2403 /* Free the TCP PCAP queues. */
2404 tcp_pcap_drain(&(tp->t_inpkts));
2405 tcp_pcap_drain(&(tp->t_outpkts));
2408 /* Allow the CC algorithm to clean up after itself. */
2409 if (CC_ALGO(tp)->cb_destroy != NULL)
2410 CC_ALGO(tp)->cb_destroy(&tp->t_ccv);
2412 /* Detach from the CC algorithm */
2416 khelp_destroy_osd(&tp->t_osd);
2419 stats_blob_destroy(tp->t_stats);
2423 if ((m = STAILQ_FIRST(&tp->t_inqueue)) != NULL) {
2426 STAILQ_INIT(&tp->t_inqueue);
2427 STAILQ_FOREACH_FROM_SAFE(m, &tp->t_inqueue, m_stailqpkt, prev)
2430 TCPSTATES_DEC(tp->t_state);
2432 if (tp->t_fb->tfb_tcp_fb_fini)
2433 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
2434 MPASS(!tcp_in_hpts(tp));
2436 tcp_log_tcpcbfini(tp);
2440 * If we got enough samples through the srtt filter,
2441 * save the rtt and rttvar in the routing entry.
2442 * 'Enough' is arbitrarily defined as 4 rtt samples.
2443 * 4 samples is enough for the srtt filter to converge
2444 * to within enough % of the correct value; fewer samples
2445 * and we could save a bogus rtt. The danger is not high
2446 * as tcp quickly recovers from everything.
2447 * XXX: Works very well but needs some more statistics!
2449 * XXXRRS: Updating must be after the stack fini() since
2450 * that may be converting some internal representation of
2451 * say srtt etc into the general one used by other stacks.
2452 * Lets also at least protect against the so being NULL
2453 * as RW stated below.
2455 if ((tp->t_rttupdated >= 4) && (so != NULL)) {
2456 struct hc_metrics_lite metrics;
2459 bzero(&metrics, sizeof(metrics));
2461 * Update the ssthresh always when the conditions below
2462 * are satisfied. This gives us better new start value
2463 * for the congestion avoidance for new connections.
2464 * ssthresh is only set if packet loss occurred on a session.
2466 * XXXRW: 'so' may be NULL here, and/or socket buffer may be
2467 * being torn down. Ideally this code would not use 'so'.
2469 ssthresh = tp->snd_ssthresh;
2470 if (ssthresh != 0 && ssthresh < so->so_snd.sb_hiwat / 2) {
2472 * convert the limit from user data bytes to
2473 * packets then to packet data bytes.
2475 ssthresh = (ssthresh + tp->t_maxseg / 2) / tp->t_maxseg;
2478 ssthresh *= (tp->t_maxseg +
2480 (isipv6 ? sizeof (struct ip6_hdr) +
2481 sizeof (struct tcphdr) :
2483 sizeof (struct tcpiphdr)
2490 metrics.rmx_ssthresh = ssthresh;
2492 metrics.rmx_rtt = tp->t_srtt;
2493 metrics.rmx_rttvar = tp->t_rttvar;
2494 metrics.rmx_cwnd = tp->snd_cwnd;
2495 metrics.rmx_sendpipe = 0;
2496 metrics.rmx_recvpipe = 0;
2498 tcp_hc_update(&inp->inp_inc, &metrics);
2501 refcount_release(&tp->t_fb->tfb_refcnt);
2505 * Attempt to close a TCP control block, marking it as dropped, and freeing
2506 * the socket if we hold the only reference.
2509 tcp_close(struct tcpcb *tp)
2511 struct inpcb *inp = tptoinpcb(tp);
2512 struct socket *so = tptosocket(tp);
2514 INP_WLOCK_ASSERT(inp);
2517 if (tp->t_state == TCPS_LISTEN)
2518 tcp_offload_listen_stop(tp);
2521 * This releases the TFO pending counter resource for TFO listen
2522 * sockets as well as passively-created TFO sockets that transition
2523 * from SYN_RECEIVED to CLOSED.
2525 if (tp->t_tfo_pending) {
2526 tcp_fastopen_decrement_counter(tp->t_tfo_pending);
2527 tp->t_tfo_pending = NULL;
2530 tcp_hpts_remove(tp);
2533 TCPSTAT_INC(tcps_closed);
2534 if (tp->t_state != TCPS_CLOSED)
2535 tcp_state_change(tp, TCPS_CLOSED);
2536 KASSERT(inp->inp_socket != NULL, ("tcp_close: inp_socket NULL"));
2537 soisdisconnected(so);
2538 if (inp->inp_flags & INP_SOCKREF) {
2539 inp->inp_flags &= ~INP_SOCKREF;
2548 * Notify a tcp user of an asynchronous error;
2549 * store error as soft error, but wake up user
2550 * (for now, won't do anything until can select for soft error).
2552 * Do not wake up user since there currently is no mechanism for
2553 * reporting soft errors (yet - a kqueue filter may be added).
2555 static struct inpcb *
2556 tcp_notify(struct inpcb *inp, int error)
2560 INP_WLOCK_ASSERT(inp);
2562 tp = intotcpcb(inp);
2563 KASSERT(tp != NULL, ("tcp_notify: tp == NULL"));
2566 * Ignore some errors if we are hooked up.
2567 * If connection hasn't completed, has retransmitted several times,
2568 * and receives a second error, give up now. This is better
2569 * than waiting a long time to establish a connection that
2570 * can never complete.
2572 if (tp->t_state == TCPS_ESTABLISHED &&
2573 (error == EHOSTUNREACH || error == ENETUNREACH ||
2574 error == EHOSTDOWN)) {
2575 if (inp->inp_route.ro_nh) {
2576 NH_FREE(inp->inp_route.ro_nh);
2577 inp->inp_route.ro_nh = (struct nhop_object *)NULL;
2580 } else if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift > 3 &&
2582 tp = tcp_drop(tp, error);
2588 tp->t_softerror = error;
2592 wakeup( &so->so_timeo);
2599 tcp_pcblist(SYSCTL_HANDLER_ARGS)
2601 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_tcbinfo,
2602 INPLOOKUP_RLOCKPCB);
2607 if (req->newptr != NULL)
2610 if (req->oldptr == NULL) {
2613 n = V_tcbinfo.ipi_count +
2614 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
2615 n += imax(n / 8, 10);
2616 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xtcpcb);
2620 if ((error = sysctl_wire_old_buffer(req, 0)) != 0)
2623 bzero(&xig, sizeof(xig));
2624 xig.xig_len = sizeof xig;
2625 xig.xig_count = V_tcbinfo.ipi_count +
2626 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
2627 xig.xig_gen = V_tcbinfo.ipi_gencnt;
2628 xig.xig_sogen = so_gencnt;
2629 error = SYSCTL_OUT(req, &xig, sizeof xig);
2633 error = syncache_pcblist(req);
2637 while ((inp = inp_next(&inpi)) != NULL) {
2638 if (inp->inp_gencnt <= xig.xig_gen &&
2639 cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
2642 tcp_inptoxtp(inp, &xt);
2643 error = SYSCTL_OUT(req, &xt, sizeof xt);
2654 * Give the user an updated idea of our state.
2655 * If the generation differs from what we told
2656 * her before, she knows that something happened
2657 * while we were processing this request, and it
2658 * might be necessary to retry.
2660 xig.xig_gen = V_tcbinfo.ipi_gencnt;
2661 xig.xig_sogen = so_gencnt;
2662 xig.xig_count = V_tcbinfo.ipi_count +
2663 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
2664 error = SYSCTL_OUT(req, &xig, sizeof xig);
2670 SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist,
2671 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
2672 NULL, 0, tcp_pcblist, "S,xtcpcb",
2673 "List of active TCP connections");
2677 tcp_getcred(SYSCTL_HANDLER_ARGS)
2680 struct sockaddr_in addrs[2];
2681 struct epoch_tracker et;
2685 error = priv_check(req->td, PRIV_NETINET_GETCRED);
2688 error = SYSCTL_IN(req, addrs, sizeof(addrs));
2691 NET_EPOCH_ENTER(et);
2692 inp = in_pcblookup(&V_tcbinfo, addrs[1].sin_addr, addrs[1].sin_port,
2693 addrs[0].sin_addr, addrs[0].sin_port, INPLOOKUP_RLOCKPCB, NULL);
2697 error = cr_canseeinpcb(req->td->td_ucred, inp);
2699 cru2x(inp->inp_cred, &xuc);
2704 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
2708 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, getcred,
2709 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NEEDGIANT,
2710 0, 0, tcp_getcred, "S,xucred",
2711 "Get the xucred of a TCP connection");
2716 tcp6_getcred(SYSCTL_HANDLER_ARGS)
2718 struct epoch_tracker et;
2720 struct sockaddr_in6 addrs[2];
2727 error = priv_check(req->td, PRIV_NETINET_GETCRED);
2730 error = SYSCTL_IN(req, addrs, sizeof(addrs));
2733 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
2734 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
2737 if (IN6_IS_ADDR_V4MAPPED(&addrs[0].sin6_addr)) {
2739 if (IN6_IS_ADDR_V4MAPPED(&addrs[1].sin6_addr))
2746 NET_EPOCH_ENTER(et);
2749 inp = in_pcblookup(&V_tcbinfo,
2750 *(struct in_addr *)&addrs[1].sin6_addr.s6_addr[12],
2752 *(struct in_addr *)&addrs[0].sin6_addr.s6_addr[12],
2753 addrs[0].sin6_port, INPLOOKUP_RLOCKPCB, NULL);
2756 inp = in6_pcblookup(&V_tcbinfo,
2757 &addrs[1].sin6_addr, addrs[1].sin6_port,
2758 &addrs[0].sin6_addr, addrs[0].sin6_port,
2759 INPLOOKUP_RLOCKPCB, NULL);
2763 error = cr_canseeinpcb(req->td->td_ucred, inp);
2765 cru2x(inp->inp_cred, &xuc);
2770 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
2774 SYSCTL_PROC(_net_inet6_tcp6, OID_AUTO, getcred,
2775 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NEEDGIANT,
2776 0, 0, tcp6_getcred, "S,xucred",
2777 "Get the xucred of a TCP6 connection");
2781 /* Path MTU to try next when a fragmentation-needed message is received. */
2783 tcp_next_pmtu(const struct icmp *icp, const struct ip *ip)
2785 int mtu = ntohs(icp->icmp_nextmtu);
2787 /* If no alternative MTU was proposed, try the next smaller one. */
2789 mtu = ip_next_mtu(ntohs(ip->ip_len), 1);
2790 if (mtu < V_tcp_minmss + sizeof(struct tcpiphdr))
2791 mtu = V_tcp_minmss + sizeof(struct tcpiphdr);
2797 tcp_ctlinput_with_port(struct icmp *icp, uint16_t port)
2803 struct inpcb *(*notify)(struct inpcb *, int);
2804 struct in_conninfo inc;
2805 tcp_seq icmp_tcp_seq;
2808 errno = icmp_errmap(icp);
2813 notify = tcp_mtudisc_notify;
2817 notify = tcp_drop_syn_sent;
2819 notify = tcp_notify;
2822 if (V_icmp_may_rst && icp->icmp_type == ICMP_TIMXCEED)
2823 notify = tcp_drop_syn_sent;
2825 notify = tcp_notify;
2828 notify = tcp_notify;
2832 th = (struct tcphdr *)((caddr_t)ip + (ip->ip_hl << 2));
2833 icmp_tcp_seq = th->th_seq;
2834 inp = in_pcblookup(&V_tcbinfo, ip->ip_dst, th->th_dport, ip->ip_src,
2835 th->th_sport, INPLOOKUP_WLOCKPCB, NULL);
2837 tp = intotcpcb(inp);
2839 if (tp->t_flags & TF_TOE && errno == EMSGSIZE) {
2841 * MTU discovery for offloaded connections. Let
2842 * the TOE driver verify seq# and process it.
2844 mtu = tcp_next_pmtu(icp, ip);
2845 tcp_offload_pmtu_update(tp, icmp_tcp_seq, mtu);
2849 if (tp->t_port != port)
2851 if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) &&
2852 SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) {
2853 if (errno == EMSGSIZE) {
2855 * MTU discovery: we got a needfrag and
2856 * will potentially try a lower MTU.
2858 mtu = tcp_next_pmtu(icp, ip);
2861 * Only process the offered MTU if it
2862 * is smaller than the current one.
2864 if (mtu < tp->t_maxseg +
2865 sizeof(struct tcpiphdr)) {
2866 bzero(&inc, sizeof(inc));
2867 inc.inc_faddr = ip->ip_dst;
2869 inp->inp_inc.inc_fibnum;
2870 tcp_hc_updatemtu(&inc, mtu);
2871 inp = tcp_mtudisc(inp, mtu);
2874 inp = (*notify)(inp, errno);
2877 bzero(&inc, sizeof(inc));
2878 inc.inc_fport = th->th_dport;
2879 inc.inc_lport = th->th_sport;
2880 inc.inc_faddr = ip->ip_dst;
2881 inc.inc_laddr = ip->ip_src;
2882 syncache_unreach(&inc, icmp_tcp_seq, port);
2890 tcp_ctlinput(struct icmp *icmp)
2892 tcp_ctlinput_with_port(icmp, htons(0));
2896 tcp_ctlinput_viaudp(udp_tun_icmp_param_t param)
2898 /* Its a tunneled TCP over UDP icmp */
2899 struct icmp *icmp = param.icmp;
2900 struct ip *outer_ip, *inner_ip;
2902 struct tcphdr *th, ttemp;
2906 outer_ip = (struct ip *)((caddr_t)icmp - sizeof(struct ip));
2907 inner_ip = &icmp->icmp_ip;
2908 i_hlen = inner_ip->ip_hl << 2;
2909 o_len = ntohs(outer_ip->ip_len);
2911 (sizeof(struct ip) + 8 + i_hlen + sizeof(struct udphdr) + offsetof(struct tcphdr, th_ack))) {
2912 /* Not enough data present */
2915 /* Ok lets strip out the inner udphdr header by copying up on top of it the tcp hdr */
2916 udp = (struct udphdr *)(((caddr_t)inner_ip) + i_hlen);
2917 if (ntohs(udp->uh_sport) != V_tcp_udp_tunneling_port) {
2920 port = udp->uh_dport;
2921 th = (struct tcphdr *)(udp + 1);
2922 memcpy(&ttemp, th, sizeof(struct tcphdr));
2923 memcpy(udp, &ttemp, sizeof(struct tcphdr));
2924 /* Now adjust down the size of the outer IP header */
2925 o_len -= sizeof(struct udphdr);
2926 outer_ip->ip_len = htons(o_len);
2927 /* Now call in to the normal handling code */
2928 tcp_ctlinput_with_port(icmp, port);
2934 tcp6_next_pmtu(const struct icmp6_hdr *icmp6)
2936 int mtu = ntohl(icmp6->icmp6_mtu);
2939 * If no alternative MTU was proposed, or the proposed MTU was too
2940 * small, set to the min.
2942 if (mtu < IPV6_MMTU)
2943 mtu = IPV6_MMTU - 8; /* XXXNP: what is the adjustment for? */
2948 tcp6_ctlinput_with_port(struct ip6ctlparam *ip6cp, uint16_t port)
2950 struct in6_addr *dst;
2951 struct inpcb *(*notify)(struct inpcb *, int);
2952 struct ip6_hdr *ip6;
2956 struct icmp6_hdr *icmp6;
2957 struct in_conninfo inc;
2962 tcp_seq icmp_tcp_seq;
2967 icmp6 = ip6cp->ip6c_icmp6;
2969 ip6 = ip6cp->ip6c_ip6;
2970 off = ip6cp->ip6c_off;
2971 dst = &ip6cp->ip6c_finaldst->sin6_addr;
2973 errno = icmp6_errmap(icmp6);
2978 notify = tcp_mtudisc_notify;
2982 notify = tcp_drop_syn_sent;
2984 notify = tcp_notify;
2988 * There are only four ICMPs that may reset connection:
2989 * - administratively prohibited
2990 * - port unreachable
2991 * - time exceeded in transit
2992 * - unknown next header
2994 if (V_icmp_may_rst &&
2995 ((icmp6->icmp6_type == ICMP6_DST_UNREACH &&
2996 (icmp6->icmp6_code == ICMP6_DST_UNREACH_ADMIN ||
2997 icmp6->icmp6_code == ICMP6_DST_UNREACH_NOPORT)) ||
2998 (icmp6->icmp6_type == ICMP6_TIME_EXCEEDED &&
2999 icmp6->icmp6_code == ICMP6_TIME_EXCEED_TRANSIT) ||
3000 (icmp6->icmp6_type == ICMP6_PARAM_PROB &&
3001 icmp6->icmp6_code == ICMP6_PARAMPROB_NEXTHEADER)))
3002 notify = tcp_drop_syn_sent;
3004 notify = tcp_notify;
3007 notify = tcp_notify;
3010 /* Check if we can safely get the ports from the tcp hdr */
3013 (int32_t) (off + sizeof(struct tcp_ports)))) {
3016 bzero(&t_ports, sizeof(struct tcp_ports));
3017 m_copydata(m, off, sizeof(struct tcp_ports), (caddr_t)&t_ports);
3018 inp = in6_pcblookup(&V_tcbinfo, &ip6->ip6_dst, t_ports.th_dport,
3019 &ip6->ip6_src, t_ports.th_sport, INPLOOKUP_WLOCKPCB, NULL);
3020 off += sizeof(struct tcp_ports);
3021 if (m->m_pkthdr.len < (int32_t) (off + sizeof(tcp_seq))) {
3024 m_copydata(m, off, sizeof(tcp_seq), (caddr_t)&icmp_tcp_seq);
3026 tp = intotcpcb(inp);
3028 if (tp->t_flags & TF_TOE && errno == EMSGSIZE) {
3029 /* MTU discovery for offloaded connections. */
3030 mtu = tcp6_next_pmtu(icmp6);
3031 tcp_offload_pmtu_update(tp, icmp_tcp_seq, mtu);
3035 if (tp->t_port != port)
3037 if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) &&
3038 SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) {
3039 if (errno == EMSGSIZE) {
3042 * If we got a needfrag set the MTU
3043 * in the route to the suggested new
3044 * value (if given) and then notify.
3046 mtu = tcp6_next_pmtu(icmp6);
3048 bzero(&inc, sizeof(inc));
3049 inc.inc_fibnum = M_GETFIB(m);
3050 inc.inc_flags |= INC_ISIPV6;
3051 inc.inc6_faddr = *dst;
3052 if (in6_setscope(&inc.inc6_faddr,
3053 m->m_pkthdr.rcvif, NULL))
3056 * Only process the offered MTU if it
3057 * is smaller than the current one.
3059 if (mtu < tp->t_maxseg +
3060 sizeof (struct tcphdr) +
3061 sizeof (struct ip6_hdr)) {
3062 tcp_hc_updatemtu(&inc, mtu);
3063 tcp_mtudisc(inp, mtu);
3064 ICMP6STAT_INC(icp6s_pmtuchg);
3067 inp = (*notify)(inp, errno);
3070 bzero(&inc, sizeof(inc));
3071 inc.inc_fibnum = M_GETFIB(m);
3072 inc.inc_flags |= INC_ISIPV6;
3073 inc.inc_fport = t_ports.th_dport;
3074 inc.inc_lport = t_ports.th_sport;
3075 inc.inc6_faddr = *dst;
3076 inc.inc6_laddr = ip6->ip6_src;
3077 syncache_unreach(&inc, icmp_tcp_seq, port);
3085 tcp6_ctlinput(struct ip6ctlparam *ctl)
3087 tcp6_ctlinput_with_port(ctl, htons(0));
3091 tcp6_ctlinput_viaudp(udp_tun_icmp_param_t param)
3093 struct ip6ctlparam *ip6cp = param.ip6cp;
3098 m = m_pulldown(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(struct udphdr), NULL);
3102 udp = mtod(m, struct udphdr *);
3103 if (ntohs(udp->uh_sport) != V_tcp_udp_tunneling_port) {
3106 port = udp->uh_dport;
3107 m_adj(m, sizeof(struct udphdr));
3108 if ((m->m_flags & M_PKTHDR) == 0) {
3109 ip6cp->ip6c_m->m_pkthdr.len -= sizeof(struct udphdr);
3111 /* Now call in to the normal handling code */
3112 tcp6_ctlinput_with_port(ip6cp, port);
3118 tcp_keyed_hash(struct in_conninfo *inc, u_char *key, u_int len)
3123 KASSERT(len >= SIPHASH_KEY_LENGTH,
3124 ("%s: keylen %u too short ", __func__, len));
3125 SipHash24_Init(&ctx);
3126 SipHash_SetKey(&ctx, (uint8_t *)key);
3127 SipHash_Update(&ctx, &inc->inc_fport, sizeof(uint16_t));
3128 SipHash_Update(&ctx, &inc->inc_lport, sizeof(uint16_t));
3129 switch (inc->inc_flags & INC_ISIPV6) {
3132 SipHash_Update(&ctx, &inc->inc_faddr, sizeof(struct in_addr));
3133 SipHash_Update(&ctx, &inc->inc_laddr, sizeof(struct in_addr));
3138 SipHash_Update(&ctx, &inc->inc6_faddr, sizeof(struct in6_addr));
3139 SipHash_Update(&ctx, &inc->inc6_laddr, sizeof(struct in6_addr));
3143 SipHash_Final((uint8_t *)hash, &ctx);
3145 return (hash[0] ^ hash[1]);
3149 tcp_new_ts_offset(struct in_conninfo *inc)
3151 struct in_conninfo inc_store, *local_inc;
3153 if (!V_tcp_ts_offset_per_conn) {
3154 memcpy(&inc_store, inc, sizeof(struct in_conninfo));
3155 inc_store.inc_lport = 0;
3156 inc_store.inc_fport = 0;
3157 local_inc = &inc_store;
3161 return (tcp_keyed_hash(local_inc, V_ts_offset_secret,
3162 sizeof(V_ts_offset_secret)));
3166 * Following is where TCP initial sequence number generation occurs.
3168 * There are two places where we must use initial sequence numbers:
3169 * 1. In SYN-ACK packets.
3170 * 2. In SYN packets.
3172 * All ISNs for SYN-ACK packets are generated by the syncache. See
3173 * tcp_syncache.c for details.
3175 * The ISNs in SYN packets must be monotonic; TIME_WAIT recycling
3176 * depends on this property. In addition, these ISNs should be
3177 * unguessable so as to prevent connection hijacking. To satisfy
3178 * the requirements of this situation, the algorithm outlined in
3179 * RFC 1948 is used, with only small modifications.
3181 * Implementation details:
3183 * Time is based off the system timer, and is corrected so that it
3184 * increases by one megabyte per second. This allows for proper
3185 * recycling on high speed LANs while still leaving over an hour
3188 * As reading the *exact* system time is too expensive to be done
3189 * whenever setting up a TCP connection, we increment the time
3190 * offset in two ways. First, a small random positive increment
3191 * is added to isn_offset for each connection that is set up.
3192 * Second, the function tcp_isn_tick fires once per clock tick
3193 * and increments isn_offset as necessary so that sequence numbers
3194 * are incremented at approximately ISN_BYTES_PER_SECOND. The
3195 * random positive increments serve only to ensure that the same
3196 * exact sequence number is never sent out twice (as could otherwise
3197 * happen when a port is recycled in less than the system tick
3200 * net.inet.tcp.isn_reseed_interval controls the number of seconds
3201 * between seeding of isn_secret. This is normally set to zero,
3202 * as reseeding should not be necessary.
3204 * Locking of the global variables isn_secret, isn_last_reseed, isn_offset,
3205 * isn_offset_old, and isn_ctx is performed using the ISN lock. In
3206 * general, this means holding an exclusive (write) lock.
3209 #define ISN_BYTES_PER_SECOND 1048576
3210 #define ISN_STATIC_INCREMENT 4096
3211 #define ISN_RANDOM_INCREMENT (4096 - 1)
3212 #define ISN_SECRET_LENGTH SIPHASH_KEY_LENGTH
3214 VNET_DEFINE_STATIC(u_char, isn_secret[ISN_SECRET_LENGTH]);
3215 VNET_DEFINE_STATIC(int, isn_last);
3216 VNET_DEFINE_STATIC(int, isn_last_reseed);
3217 VNET_DEFINE_STATIC(u_int32_t, isn_offset);
3218 VNET_DEFINE_STATIC(u_int32_t, isn_offset_old);
3220 #define V_isn_secret VNET(isn_secret)
3221 #define V_isn_last VNET(isn_last)
3222 #define V_isn_last_reseed VNET(isn_last_reseed)
3223 #define V_isn_offset VNET(isn_offset)
3224 #define V_isn_offset_old VNET(isn_offset_old)
3227 tcp_new_isn(struct in_conninfo *inc)
3230 u_int32_t projected_offset;
3233 /* Seed if this is the first use, reseed if requested. */
3234 if ((V_isn_last_reseed == 0) || ((V_tcp_isn_reseed_interval > 0) &&
3235 (((u_int)V_isn_last_reseed + (u_int)V_tcp_isn_reseed_interval*hz)
3237 arc4rand(&V_isn_secret, sizeof(V_isn_secret), 0);
3238 V_isn_last_reseed = ticks;
3241 /* Compute the hash and return the ISN. */
3242 new_isn = (tcp_seq)tcp_keyed_hash(inc, V_isn_secret,
3243 sizeof(V_isn_secret));
3244 V_isn_offset += ISN_STATIC_INCREMENT +
3245 (arc4random() & ISN_RANDOM_INCREMENT);
3246 if (ticks != V_isn_last) {
3247 projected_offset = V_isn_offset_old +
3248 ISN_BYTES_PER_SECOND / hz * (ticks - V_isn_last);
3249 if (SEQ_GT(projected_offset, V_isn_offset))
3250 V_isn_offset = projected_offset;
3251 V_isn_offset_old = V_isn_offset;
3254 new_isn += V_isn_offset;
3260 * When a specific ICMP unreachable message is received and the
3261 * connection state is SYN-SENT, drop the connection. This behavior
3262 * is controlled by the icmp_may_rst sysctl.
3264 static struct inpcb *
3265 tcp_drop_syn_sent(struct inpcb *inp, int errno)
3270 INP_WLOCK_ASSERT(inp);
3272 tp = intotcpcb(inp);
3273 if (tp->t_state != TCPS_SYN_SENT)
3276 if (IS_FASTOPEN(tp->t_flags))
3277 tcp_fastopen_disable_path(tp);
3279 tp = tcp_drop(tp, errno);
3287 * When `need fragmentation' ICMP is received, update our idea of the MSS
3288 * based on the new value. Also nudge TCP to send something, since we
3289 * know the packet we just sent was dropped.
3290 * This duplicates some code in the tcp_mss() function in tcp_input.c.
3292 static struct inpcb *
3293 tcp_mtudisc_notify(struct inpcb *inp, int error)
3296 return (tcp_mtudisc(inp, -1));
3299 static struct inpcb *
3300 tcp_mtudisc(struct inpcb *inp, int mtuoffer)
3305 INP_WLOCK_ASSERT(inp);
3307 tp = intotcpcb(inp);
3308 KASSERT(tp != NULL, ("tcp_mtudisc: tp == NULL"));
3310 tcp_mss_update(tp, -1, mtuoffer, NULL, NULL);
3312 so = inp->inp_socket;
3313 SOCKBUF_LOCK(&so->so_snd);
3314 /* If the mss is larger than the socket buffer, decrease the mss. */
3315 if (so->so_snd.sb_hiwat < tp->t_maxseg)
3316 tp->t_maxseg = so->so_snd.sb_hiwat;
3317 SOCKBUF_UNLOCK(&so->so_snd);
3319 TCPSTAT_INC(tcps_mturesent);
3321 tp->snd_nxt = tp->snd_una;
3322 tcp_free_sackholes(tp);
3323 tp->snd_recover = tp->snd_max;
3324 if (tp->t_flags & TF_SACK_PERMIT)
3325 EXIT_FASTRECOVERY(tp->t_flags);
3326 if (tp->t_fb->tfb_tcp_mtu_chg != NULL) {
3328 * Conceptually the snd_nxt setting
3329 * and freeing sack holes should
3330 * be done by the default stacks
3331 * own tfb_tcp_mtu_chg().
3333 tp->t_fb->tfb_tcp_mtu_chg(tp);
3335 if (tcp_output(tp) < 0)
3343 * Look-up the routing entry to the peer of this inpcb. If no route
3344 * is found and it cannot be allocated, then return 0. This routine
3345 * is called by TCP routines that access the rmx structure and by
3346 * tcp_mss_update to get the peer/interface MTU.
3349 tcp_maxmtu(struct in_conninfo *inc, struct tcp_ifcap *cap)
3351 struct nhop_object *nh;
3353 uint32_t maxmtu = 0;
3355 KASSERT(inc != NULL, ("tcp_maxmtu with NULL in_conninfo pointer"));
3357 if (inc->inc_faddr.s_addr != INADDR_ANY) {
3358 nh = fib4_lookup(inc->inc_fibnum, inc->inc_faddr, 0, NHR_NONE, 0);
3363 maxmtu = nh->nh_mtu;
3365 /* Report additional interface capabilities. */
3367 if (ifp->if_capenable & IFCAP_TSO4 &&
3368 ifp->if_hwassist & CSUM_TSO) {
3369 cap->ifcap |= CSUM_TSO;
3370 cap->tsomax = ifp->if_hw_tsomax;
3371 cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
3372 cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
3382 tcp_maxmtu6(struct in_conninfo *inc, struct tcp_ifcap *cap)
3384 struct nhop_object *nh;
3385 struct in6_addr dst6;
3388 uint32_t maxmtu = 0;
3390 KASSERT(inc != NULL, ("tcp_maxmtu6 with NULL in_conninfo pointer"));
3392 if (inc->inc_flags & INC_IPV6MINMTU)
3395 if (!IN6_IS_ADDR_UNSPECIFIED(&inc->inc6_faddr)) {
3396 in6_splitscope(&inc->inc6_faddr, &dst6, &scopeid);
3397 nh = fib6_lookup(inc->inc_fibnum, &dst6, scopeid, NHR_NONE, 0);
3402 maxmtu = nh->nh_mtu;
3404 /* Report additional interface capabilities. */
3406 if (ifp->if_capenable & IFCAP_TSO6 &&
3407 ifp->if_hwassist & CSUM_TSO) {
3408 cap->ifcap |= CSUM_TSO;
3409 cap->tsomax = ifp->if_hw_tsomax;
3410 cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
3411 cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
3420 * Handle setsockopt(IPV6_USE_MIN_MTU) by a TCP stack.
3422 * XXXGL: we are updating inpcb here with INC_IPV6MINMTU flag.
3423 * The right place to do that is ip6_setpktopt() that has just been
3424 * executed. By the way it just filled ip6po_minmtu for us.
3427 tcp6_use_min_mtu(struct tcpcb *tp)
3429 struct inpcb *inp = tptoinpcb(tp);
3431 INP_WLOCK_ASSERT(inp);
3433 * In case of the IPV6_USE_MIN_MTU socket
3434 * option, the INC_IPV6MINMTU flag to announce
3435 * a corresponding MSS during the initial
3436 * handshake. If the TCP connection is not in
3437 * the front states, just reduce the MSS being
3438 * used. This avoids the sending of TCP
3439 * segments which will be fragmented at the
3442 inp->inp_inc.inc_flags |= INC_IPV6MINMTU;
3443 if ((tp->t_state >= TCPS_SYN_SENT) &&
3444 (inp->inp_inc.inc_flags & INC_ISIPV6)) {
3445 struct ip6_pktopts *opt;
3447 opt = inp->in6p_outputopts;
3448 if (opt != NULL && opt->ip6po_minmtu == IP6PO_MINMTU_ALL &&
3449 tp->t_maxseg > TCP6_MSS)
3450 tp->t_maxseg = TCP6_MSS;
3456 * Calculate effective SMSS per RFC5681 definition for a given TCP
3457 * connection at its current state, taking into account SACK and etc.
3460 tcp_maxseg(const struct tcpcb *tp)
3464 if (tp->t_flags & TF_NOOPT)
3465 return (tp->t_maxseg);
3468 * Here we have a simplified code from tcp_addoptions(),
3469 * without a proper loop, and having most of paddings hardcoded.
3470 * We might make mistakes with padding here in some edge cases,
3471 * but this is harmless, since result of tcp_maxseg() is used
3472 * only in cwnd and ssthresh estimations.
3474 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
3475 if (tp->t_flags & TF_RCVD_TSTMP)
3476 optlen = TCPOLEN_TSTAMP_APPA;
3479 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3480 if (tp->t_flags & TF_SIGNATURE)
3481 optlen += PADTCPOLEN(TCPOLEN_SIGNATURE);
3483 if ((tp->t_flags & TF_SACK_PERMIT) && tp->rcv_numsacks > 0) {
3484 optlen += TCPOLEN_SACKHDR;
3485 optlen += tp->rcv_numsacks * TCPOLEN_SACK;
3486 optlen = PADTCPOLEN(optlen);
3489 if (tp->t_flags & TF_REQ_TSTMP)
3490 optlen = TCPOLEN_TSTAMP_APPA;
3492 optlen = PADTCPOLEN(TCPOLEN_MAXSEG);
3493 if (tp->t_flags & TF_REQ_SCALE)
3494 optlen += PADTCPOLEN(TCPOLEN_WINDOW);
3495 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3496 if (tp->t_flags & TF_SIGNATURE)
3497 optlen += PADTCPOLEN(TCPOLEN_SIGNATURE);
3499 if (tp->t_flags & TF_SACK_PERMIT)
3500 optlen += PADTCPOLEN(TCPOLEN_SACK_PERMITTED);
3503 optlen = min(optlen, TCP_MAXOLEN);
3504 return (tp->t_maxseg - optlen);
3509 tcp_fixed_maxseg(const struct tcpcb *tp)
3513 if (tp->t_flags & TF_NOOPT)
3514 return (tp->t_maxseg);
3517 * Here we have a simplified code from tcp_addoptions(),
3518 * without a proper loop, and having most of paddings hardcoded.
3519 * We only consider fixed options that we would send every
3520 * time I.e. SACK is not considered. This is important
3521 * for cc modules to figure out what the modulo of the
3524 #define PAD(len) ((((len) / 4) + !!((len) % 4)) * 4)
3525 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
3526 if (tp->t_flags & TF_RCVD_TSTMP)
3527 optlen = TCPOLEN_TSTAMP_APPA;
3530 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3531 if (tp->t_flags & TF_SIGNATURE)
3532 optlen += PAD(TCPOLEN_SIGNATURE);
3535 if (tp->t_flags & TF_REQ_TSTMP)
3536 optlen = TCPOLEN_TSTAMP_APPA;
3538 optlen = PAD(TCPOLEN_MAXSEG);
3539 if (tp->t_flags & TF_REQ_SCALE)
3540 optlen += PAD(TCPOLEN_WINDOW);
3541 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3542 if (tp->t_flags & TF_SIGNATURE)
3543 optlen += PAD(TCPOLEN_SIGNATURE);
3545 if (tp->t_flags & TF_SACK_PERMIT)
3546 optlen += PAD(TCPOLEN_SACK_PERMITTED);
3549 optlen = min(optlen, TCP_MAXOLEN);
3550 return (tp->t_maxseg - optlen);
3556 sysctl_drop(SYSCTL_HANDLER_ARGS)
3558 /* addrs[0] is a foreign socket, addrs[1] is a local one. */
3559 struct sockaddr_storage addrs[2];
3563 struct sockaddr_in *fin = NULL, *lin = NULL;
3565 struct epoch_tracker et;
3567 struct sockaddr_in6 *fin6, *lin6;
3577 if (req->oldptr != NULL || req->oldlen != 0)
3579 if (req->newptr == NULL)
3581 if (req->newlen < sizeof(addrs))
3583 error = SYSCTL_IN(req, &addrs, sizeof(addrs));
3587 switch (addrs[0].ss_family) {
3590 fin6 = (struct sockaddr_in6 *)&addrs[0];
3591 lin6 = (struct sockaddr_in6 *)&addrs[1];
3592 if (fin6->sin6_len != sizeof(struct sockaddr_in6) ||
3593 lin6->sin6_len != sizeof(struct sockaddr_in6))
3595 if (IN6_IS_ADDR_V4MAPPED(&fin6->sin6_addr)) {
3596 if (!IN6_IS_ADDR_V4MAPPED(&lin6->sin6_addr))
3598 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[0]);
3599 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[1]);
3601 fin = (struct sockaddr_in *)&addrs[0];
3602 lin = (struct sockaddr_in *)&addrs[1];
3606 error = sa6_embedscope(fin6, V_ip6_use_defzone);
3609 error = sa6_embedscope(lin6, V_ip6_use_defzone);
3616 fin = (struct sockaddr_in *)&addrs[0];
3617 lin = (struct sockaddr_in *)&addrs[1];
3618 if (fin->sin_len != sizeof(struct sockaddr_in) ||
3619 lin->sin_len != sizeof(struct sockaddr_in))
3626 NET_EPOCH_ENTER(et);
3627 switch (addrs[0].ss_family) {
3630 inp = in6_pcblookup(&V_tcbinfo, &fin6->sin6_addr,
3631 fin6->sin6_port, &lin6->sin6_addr, lin6->sin6_port,
3632 INPLOOKUP_WLOCKPCB, NULL);
3637 inp = in_pcblookup(&V_tcbinfo, fin->sin_addr, fin->sin_port,
3638 lin->sin_addr, lin->sin_port, INPLOOKUP_WLOCKPCB, NULL);
3643 if (!SOLISTENING(inp->inp_socket)) {
3644 tp = intotcpcb(inp);
3645 tp = tcp_drop(tp, ECONNABORTED);
3656 SYSCTL_PROC(_net_inet_tcp, TCPCTL_DROP, drop,
3657 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
3658 CTLFLAG_NEEDGIANT, NULL, 0, sysctl_drop, "",
3659 "Drop TCP connection");
3662 tcp_sysctl_setsockopt(SYSCTL_HANDLER_ARGS)
3664 return (sysctl_setsockopt(oidp, arg1, arg2, req, &V_tcbinfo,
3665 &tcp_ctloutput_set));
3668 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, setsockopt,
3669 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
3670 CTLFLAG_MPSAFE, NULL, 0, tcp_sysctl_setsockopt, "",
3671 "Set socket option for TCP endpoint");
3675 sysctl_switch_tls(SYSCTL_HANDLER_ARGS)
3677 /* addrs[0] is a foreign socket, addrs[1] is a local one. */
3678 struct sockaddr_storage addrs[2];
3681 struct sockaddr_in *fin = NULL, *lin = NULL;
3683 struct epoch_tracker et;
3685 struct sockaddr_in6 *fin6, *lin6;
3695 if (req->oldptr != NULL || req->oldlen != 0)
3697 if (req->newptr == NULL)
3699 if (req->newlen < sizeof(addrs))
3701 error = SYSCTL_IN(req, &addrs, sizeof(addrs));
3705 switch (addrs[0].ss_family) {
3708 fin6 = (struct sockaddr_in6 *)&addrs[0];
3709 lin6 = (struct sockaddr_in6 *)&addrs[1];
3710 if (fin6->sin6_len != sizeof(struct sockaddr_in6) ||
3711 lin6->sin6_len != sizeof(struct sockaddr_in6))
3713 if (IN6_IS_ADDR_V4MAPPED(&fin6->sin6_addr)) {
3714 if (!IN6_IS_ADDR_V4MAPPED(&lin6->sin6_addr))
3716 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[0]);
3717 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[1]);
3719 fin = (struct sockaddr_in *)&addrs[0];
3720 lin = (struct sockaddr_in *)&addrs[1];
3724 error = sa6_embedscope(fin6, V_ip6_use_defzone);
3727 error = sa6_embedscope(lin6, V_ip6_use_defzone);
3734 fin = (struct sockaddr_in *)&addrs[0];
3735 lin = (struct sockaddr_in *)&addrs[1];
3736 if (fin->sin_len != sizeof(struct sockaddr_in) ||
3737 lin->sin_len != sizeof(struct sockaddr_in))
3744 NET_EPOCH_ENTER(et);
3745 switch (addrs[0].ss_family) {
3748 inp = in6_pcblookup(&V_tcbinfo, &fin6->sin6_addr,
3749 fin6->sin6_port, &lin6->sin6_addr, lin6->sin6_port,
3750 INPLOOKUP_WLOCKPCB, NULL);
3755 inp = in_pcblookup(&V_tcbinfo, fin->sin_addr, fin->sin_port,
3756 lin->sin_addr, lin->sin_port, INPLOOKUP_WLOCKPCB, NULL);
3764 so = inp->inp_socket;
3766 error = ktls_set_tx_mode(so,
3767 arg2 == 0 ? TCP_TLS_MODE_SW : TCP_TLS_MODE_IFNET);
3775 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, switch_to_sw_tls,
3776 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
3777 CTLFLAG_NEEDGIANT, NULL, 0, sysctl_switch_tls, "",
3778 "Switch TCP connection to SW TLS");
3779 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, switch_to_ifnet_tls,
3780 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
3781 CTLFLAG_NEEDGIANT, NULL, 1, sysctl_switch_tls, "",
3782 "Switch TCP connection to ifnet TLS");
3786 * Generate a standardized TCP log line for use throughout the
3787 * tcp subsystem. Memory allocation is done with M_NOWAIT to
3788 * allow use in the interrupt context.
3790 * NB: The caller MUST free(s, M_TCPLOG) the returned string.
3791 * NB: The function may return NULL if memory allocation failed.
3793 * Due to header inclusion and ordering limitations the struct ip
3794 * and ip6_hdr pointers have to be passed as void pointers.
3797 tcp_log_vain(struct in_conninfo *inc, struct tcphdr *th, const void *ip4hdr,
3801 /* Is logging enabled? */
3802 if (V_tcp_log_in_vain == 0)
3805 return (tcp_log_addr(inc, th, ip4hdr, ip6hdr));
3809 tcp_log_addrs(struct in_conninfo *inc, struct tcphdr *th, const void *ip4hdr,
3813 /* Is logging enabled? */
3814 if (tcp_log_debug == 0)
3817 return (tcp_log_addr(inc, th, ip4hdr, ip6hdr));
3821 tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th, const void *ip4hdr,
3827 const struct ip *ip = (const struct ip *)ip4hdr;
3830 const struct ip6_hdr *ip6 = (const struct ip6_hdr *)ip6hdr;
3834 * The log line looks like this:
3835 * "TCP: [1.2.3.4]:50332 to [1.2.3.4]:80 tcpflags 0x2<SYN>"
3837 size = sizeof("TCP: []:12345 to []:12345 tcpflags 0x2<>") +
3838 sizeof(PRINT_TH_FLAGS) + 1 +
3840 2 * INET6_ADDRSTRLEN;
3842 2 * INET_ADDRSTRLEN;
3845 s = malloc(size, M_TCPLOG, M_ZERO|M_NOWAIT);
3849 strcat(s, "TCP: [");
3852 if (inc && ((inc->inc_flags & INC_ISIPV6) == 0)) {
3853 inet_ntoa_r(inc->inc_faddr, sp);
3855 sprintf(sp, "]:%i to [", ntohs(inc->inc_fport));
3857 inet_ntoa_r(inc->inc_laddr, sp);
3859 sprintf(sp, "]:%i", ntohs(inc->inc_lport));
3862 ip6_sprintf(sp, &inc->inc6_faddr);
3864 sprintf(sp, "]:%i to [", ntohs(inc->inc_fport));
3866 ip6_sprintf(sp, &inc->inc6_laddr);
3868 sprintf(sp, "]:%i", ntohs(inc->inc_lport));
3869 } else if (ip6 && th) {
3870 ip6_sprintf(sp, &ip6->ip6_src);
3872 sprintf(sp, "]:%i to [", ntohs(th->th_sport));
3874 ip6_sprintf(sp, &ip6->ip6_dst);
3876 sprintf(sp, "]:%i", ntohs(th->th_dport));
3879 } else if (ip && th) {
3880 inet_ntoa_r(ip->ip_src, sp);
3882 sprintf(sp, "]:%i to [", ntohs(th->th_sport));
3884 inet_ntoa_r(ip->ip_dst, sp);
3886 sprintf(sp, "]:%i", ntohs(th->th_dport));
3894 sprintf(sp, " tcpflags 0x%b", tcp_get_flags(th), PRINT_TH_FLAGS);
3895 if (*(s + size - 1) != '\0')
3896 panic("%s: string too long", __func__);
3901 * A subroutine which makes it easy to track TCP state changes with DTrace.
3902 * This function shouldn't be called for t_state initializations that don't
3903 * correspond to actual TCP state transitions.
3906 tcp_state_change(struct tcpcb *tp, int newstate)
3908 #if defined(KDTRACE_HOOKS)
3909 int pstate = tp->t_state;
3912 TCPSTATES_DEC(tp->t_state);
3913 TCPSTATES_INC(newstate);
3914 tp->t_state = newstate;
3915 TCP_PROBE6(state__change, NULL, tp, NULL, tp, NULL, pstate);
3919 * Create an external-format (``xtcpcb'') structure using the information in
3920 * the kernel-format tcpcb structure pointed to by tp. This is done to
3921 * reduce the spew of irrelevant information over this interface, to isolate
3922 * user code from changes in the kernel structure, and potentially to provide
3923 * information-hiding if we decide that some of this information should be
3924 * hidden from users.
3927 tcp_inptoxtp(const struct inpcb *inp, struct xtcpcb *xt)
3929 struct tcpcb *tp = intotcpcb(inp);
3932 bzero(xt, sizeof(*xt));
3933 xt->t_state = tp->t_state;
3934 xt->t_logstate = tcp_get_bblog_state(tp);
3935 xt->t_flags = tp->t_flags;
3936 xt->t_sndzerowin = tp->t_sndzerowin;
3937 xt->t_sndrexmitpack = tp->t_sndrexmitpack;
3938 xt->t_rcvoopack = tp->t_rcvoopack;
3939 xt->t_rcv_wnd = tp->rcv_wnd;
3940 xt->t_snd_wnd = tp->snd_wnd;
3941 xt->t_snd_cwnd = tp->snd_cwnd;
3942 xt->t_snd_ssthresh = tp->snd_ssthresh;
3943 xt->t_dsack_bytes = tp->t_dsack_bytes;
3944 xt->t_dsack_tlp_bytes = tp->t_dsack_tlp_bytes;
3945 xt->t_dsack_pack = tp->t_dsack_pack;
3946 xt->t_maxseg = tp->t_maxseg;
3947 xt->xt_ecn = (tp->t_flags2 & TF2_ECN_PERMIT) ? 1 : 0 +
3948 (tp->t_flags2 & TF2_ACE_PERMIT) ? 2 : 0;
3950 now = getsbinuptime();
3951 #define COPYTIMER(which,where) do { \
3952 if (tp->t_timers[which] != SBT_MAX) \
3953 xt->where = (tp->t_timers[which] - now) / SBT_1MS; \
3957 COPYTIMER(TT_DELACK, tt_delack);
3958 COPYTIMER(TT_REXMT, tt_rexmt);
3959 COPYTIMER(TT_PERSIST, tt_persist);
3960 COPYTIMER(TT_KEEP, tt_keep);
3961 COPYTIMER(TT_2MSL, tt_2msl);
3963 xt->t_rcvtime = 1000 * (ticks - tp->t_rcvtime) / hz;
3965 xt->xt_encaps_port = tp->t_port;
3966 bcopy(tp->t_fb->tfb_tcp_block_name, xt->xt_stack,
3967 TCP_FUNCTION_NAME_LEN_MAX);
3968 bcopy(CC_ALGO(tp)->name, xt->xt_cc, TCP_CA_NAME_MAX);
3970 (void)tcp_log_get_id(tp, xt->xt_logid);
3973 xt->xt_len = sizeof(struct xtcpcb);
3974 in_pcbtoxinpcb(inp, &xt->xt_inp);
3976 * TCP doesn't use inp_ppcb pointer, we embed inpcb into tcpcb.
3977 * Fixup the pointer that in_pcbtoxinpcb() has set. When printing
3978 * TCP netstat(1) used to use this pointer, so this fixup needs to
3979 * stay for stable/14.
3981 xt->xt_inp.inp_ppcb = (uintptr_t)tp;
3985 tcp_log_end_status(struct tcpcb *tp, uint8_t status)
3990 (status > TCP_EI_STATUS_MAX_VALUE) ||
3995 if (status > (sizeof(uint32_t) * 8)) {
3996 /* Should this be a KASSERT? */
3999 bit = 1U << (status - 1);
4000 if (bit & tp->t_end_info_status) {
4001 /* already logged */
4004 for (i = 0; i < TCP_END_BYTE_INFO; i++) {
4005 if (tp->t_end_info_bytes[i] == TCP_EI_EMPTY_SLOT) {
4006 tp->t_end_info_bytes[i] = status;
4007 tp->t_end_info_status |= bit;
4014 tcp_can_enable_pacing(void)
4017 if ((tcp_pacing_limit == -1) ||
4018 (tcp_pacing_limit > number_of_tcp_connections_pacing)) {
4019 atomic_fetchadd_int(&number_of_tcp_connections_pacing, 1);
4020 shadow_num_connections = number_of_tcp_connections_pacing;
4023 counter_u64_add(tcp_pacing_failures, 1);
4028 static uint8_t tcp_pacing_warning = 0;
4031 tcp_decrement_paced_conn(void)
4035 ret = atomic_fetchadd_int(&number_of_tcp_connections_pacing, -1);
4036 shadow_num_connections = number_of_tcp_connections_pacing;
4037 KASSERT(ret != 0, ("tcp_paced_connection_exits -1 would cause wrap?"));
4039 if (tcp_pacing_limit != -1) {
4040 printf("Warning all pacing is now disabled, count decrements invalidly!\n");
4041 tcp_pacing_limit = 0;
4042 } else if (tcp_pacing_warning == 0) {
4043 printf("Warning pacing count is invalid, invalid decrement\n");
4044 tcp_pacing_warning = 1;
4050 tcp_default_switch_failed(struct tcpcb *tp)
4053 * If a switch fails we only need to
4054 * care about two things:
4057 * b) The timer granularity.
4058 * Timeouts, at least for now, don't use the
4059 * old callout system in the other stacks so
4060 * those are hopefully safe.
4062 tcp_lro_features_off(tp);
4063 tcp_change_time_units(tp, TCP_TMR_GRANULARITY_TICKS);
4066 #ifdef TCP_ACCOUNTING
4068 tcp_do_ack_accounting(struct tcpcb *tp, struct tcphdr *th, struct tcpopt *to, uint32_t tiwin, int mss)
4070 if (SEQ_LT(th->th_ack, tp->snd_una)) {
4071 /* Do we have a SACK? */
4072 if (to->to_flags & TOF_SACK) {
4073 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4074 tp->tcp_cnt_counters[ACK_SACK]++;
4078 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4079 tp->tcp_cnt_counters[ACK_BEHIND]++;
4081 return (ACK_BEHIND);
4083 } else if (th->th_ack == tp->snd_una) {
4084 /* Do we have a SACK? */
4085 if (to->to_flags & TOF_SACK) {
4086 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4087 tp->tcp_cnt_counters[ACK_SACK]++;
4090 } else if (tiwin != tp->snd_wnd) {
4091 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4092 tp->tcp_cnt_counters[ACK_RWND]++;
4096 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4097 tp->tcp_cnt_counters[ACK_DUPACK]++;
4099 return (ACK_DUPACK);
4102 if (!SEQ_GT(th->th_ack, tp->snd_max)) {
4103 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4104 tp->tcp_cnt_counters[CNT_OF_ACKS_IN] += (((th->th_ack - tp->snd_una) + mss - 1)/mss);
4107 if (to->to_flags & TOF_SACK) {
4108 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4109 tp->tcp_cnt_counters[ACK_CUMACK_SACK]++;
4111 return (ACK_CUMACK_SACK);
4113 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) {
4114 tp->tcp_cnt_counters[ACK_CUMACK]++;
4116 return (ACK_CUMACK);
4123 tcp_change_time_units(struct tcpcb *tp, int granularity)
4125 if (tp->t_tmr_granularity == granularity) {
4129 if (granularity == TCP_TMR_GRANULARITY_USEC) {
4130 KASSERT((tp->t_tmr_granularity == TCP_TMR_GRANULARITY_TICKS),
4131 ("Granularity is not TICKS its %u in tp:%p",
4132 tp->t_tmr_granularity, tp));
4133 tp->t_rttlow = TICKS_2_USEC(tp->t_rttlow);
4134 if (tp->t_srtt > 1) {
4137 val = tp->t_srtt >> TCP_RTT_SHIFT;
4138 frac = tp->t_srtt & 0x1f;
4139 tp->t_srtt = TICKS_2_USEC(val);
4141 * frac is the fractional part of the srtt (if any)
4142 * but its in ticks and every bit represents
4147 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_MSEC) / (uint64_t)TCP_RTT_SCALE);
4149 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_SEC) / ((uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE));
4157 val = tp->t_rttvar >> TCP_RTTVAR_SHIFT;
4158 frac = tp->t_rttvar & 0x1f;
4159 tp->t_rttvar = TICKS_2_USEC(val);
4161 * frac is the fractional part of the srtt (if any)
4162 * but its in ticks and every bit represents
4167 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_MSEC) / (uint64_t)TCP_RTT_SCALE);
4169 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_SEC) / ((uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE));
4171 tp->t_rttvar += frac;
4174 tp->t_tmr_granularity = TCP_TMR_GRANULARITY_USEC;
4175 } else if (granularity == TCP_TMR_GRANULARITY_TICKS) {
4176 /* Convert back to ticks, with */
4177 KASSERT((tp->t_tmr_granularity == TCP_TMR_GRANULARITY_USEC),
4178 ("Granularity is not USEC its %u in tp:%p",
4179 tp->t_tmr_granularity, tp));
4180 if (tp->t_srtt > 1) {
4183 val = USEC_2_TICKS(tp->t_srtt);
4184 frac = tp->t_srtt % (HPTS_USEC_IN_SEC / hz);
4185 tp->t_srtt = val << TCP_RTT_SHIFT;
4187 * frac is the fractional part here is left
4188 * over from converting to hz and shifting.
4189 * We need to convert this to the 5 bit
4194 frac = (((uint64_t)frac * (uint64_t)TCP_RTT_SCALE) / (uint64_t)HPTS_USEC_IN_MSEC);
4196 frac = (((uint64_t)frac * (uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE) /(uint64_t)HPTS_USEC_IN_SEC);
4204 val = USEC_2_TICKS(tp->t_rttvar);
4205 frac = tp->t_srtt % (HPTS_USEC_IN_SEC / hz);
4206 tp->t_rttvar = val << TCP_RTTVAR_SHIFT;
4208 * frac is the fractional part here is left
4209 * over from converting to hz and shifting.
4210 * We need to convert this to the 5 bit
4215 frac = (((uint64_t)frac * (uint64_t)TCP_RTT_SCALE) / (uint64_t)HPTS_USEC_IN_MSEC);
4217 frac = (((uint64_t)frac * (uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE) /(uint64_t)HPTS_USEC_IN_SEC);
4219 tp->t_rttvar += frac;
4222 tp->t_rttlow = USEC_2_TICKS(tp->t_rttlow);
4223 tp->t_tmr_granularity = TCP_TMR_GRANULARITY_TICKS;
4227 panic("Unknown granularity:%d tp:%p",
4234 tcp_handle_orphaned_packets(struct tcpcb *tp)
4236 struct mbuf *save, *m, *prev;
4238 * Called when a stack switch is occuring from the fini()
4239 * of the old stack. We assue the init() as already been
4240 * run of the new stack and it has set the t_flags2 to
4241 * what it supports. This function will then deal with any
4242 * differences i.e. cleanup packets that maybe queued that
4243 * the newstack does not support.
4246 if (tp->t_flags2 & TF2_MBUF_L_ACKS)
4248 if ((tp->t_flags2 & TF2_SUPPORTS_MBUFQ) == 0 &&
4249 !STAILQ_EMPTY(&tp->t_inqueue)) {
4251 * It is unsafe to process the packets since a
4252 * reset may be lurking in them (its rare but it
4253 * can occur). If we were to find a RST, then we
4254 * would end up dropping the connection and the
4255 * INP lock, so when we return the caller (tcp_usrreq)
4256 * will blow up when it trys to unlock the inp.
4257 * This new stack does not do any fancy LRO features
4258 * so all we can do is toss the packets.
4260 m = STAILQ_FIRST(&tp->t_inqueue);
4261 STAILQ_INIT(&tp->t_inqueue);
4262 STAILQ_FOREACH_FROM_SAFE(m, &tp->t_inqueue, m_stailqpkt, save)
4266 * Here we have a stack that does mbuf queuing but
4267 * does not support compressed ack's. We must
4268 * walk all the mbufs and discard any compressed acks.
4270 STAILQ_FOREACH_SAFE(m, &tp->t_inqueue, m_stailqpkt, save) {
4271 if (m->m_flags & M_ACKCMP) {
4272 if (m == STAILQ_FIRST(&tp->t_inqueue))
4273 STAILQ_REMOVE_HEAD(&tp->t_inqueue,
4276 STAILQ_REMOVE_AFTER(&tp->t_inqueue,
4285 #ifdef TCP_REQUEST_TRK
4287 tcp_estimate_tls_overhead(struct socket *so, uint64_t tls_usr_bytes)
4290 struct ktls_session *tls;
4291 uint32_t rec_oh, records;
4293 tls = so->so_snd.sb_tls_info;
4297 rec_oh = tls->params.tls_hlen + tls->params.tls_tlen;
4298 records = ((tls_usr_bytes + tls->params.max_frame_len - 1)/tls->params.max_frame_len);
4299 return (records * rec_oh);
4305 extern uint32_t tcp_stale_entry_time;
4306 uint32_t tcp_stale_entry_time = 250000;
4307 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, usrlog_stale, CTLFLAG_RW,
4308 &tcp_stale_entry_time, 250000, "Time that a tcpreq entry without a sendfile ages out");
4311 tcp_req_log_req_info(struct tcpcb *tp, struct tcp_sendfile_track *req,
4312 uint16_t slot, uint8_t val, uint64_t offset, uint64_t nbytes)
4314 if (tcp_bblogging_on(tp)) {
4315 union tcp_log_stackspecific log;
4318 memset(&log.u_bbr, 0, sizeof(log.u_bbr));
4320 log.u_bbr.inhpts = tcp_in_hpts(tp);
4322 log.u_bbr.flex8 = val;
4323 log.u_bbr.rttProp = req->timestamp;
4324 log.u_bbr.delRate = req->start;
4325 log.u_bbr.cur_del_rate = req->end;
4326 log.u_bbr.flex1 = req->start_seq;
4327 log.u_bbr.flex2 = req->end_seq;
4328 log.u_bbr.flex3 = req->flags;
4329 log.u_bbr.flex4 = ((req->localtime >> 32) & 0x00000000ffffffff);
4330 log.u_bbr.flex5 = (req->localtime & 0x00000000ffffffff);
4331 log.u_bbr.flex7 = slot;
4332 log.u_bbr.bw_inuse = offset;
4333 /* nbytes = flex6 | epoch */
4334 log.u_bbr.flex6 = ((nbytes >> 32) & 0x00000000ffffffff);
4335 log.u_bbr.epoch = (nbytes & 0x00000000ffffffff);
4336 /* cspr = lt_epoch | pkts_out */
4337 log.u_bbr.lt_epoch = ((req->cspr >> 32) & 0x00000000ffffffff);
4338 log.u_bbr.pkts_out |= (req->cspr & 0x00000000ffffffff);
4339 log.u_bbr.applimited = tp->t_tcpreq_closed;
4340 log.u_bbr.applimited <<= 8;
4341 log.u_bbr.applimited |= tp->t_tcpreq_open;
4342 log.u_bbr.applimited <<= 8;
4343 log.u_bbr.applimited |= tp->t_tcpreq_req;
4344 log.u_bbr.timeStamp = tcp_get_usecs(&tv);
4345 TCP_LOG_EVENTP(tp, NULL,
4346 &tptosocket(tp)->so_rcv,
4347 &tptosocket(tp)->so_snd,
4349 0, &log, false, &tv);
4354 tcp_req_free_a_slot(struct tcpcb *tp, struct tcp_sendfile_track *ent)
4356 if (tp->t_tcpreq_req > 0)
4358 if (ent->flags & TCP_TRK_TRACK_FLG_OPEN) {
4359 if (tp->t_tcpreq_open > 0)
4360 tp->t_tcpreq_open--;
4362 if (tp->t_tcpreq_closed > 0)
4363 tp->t_tcpreq_closed--;
4365 ent->flags = TCP_TRK_TRACK_FLG_EMPTY;
4369 tcp_req_check_for_stale_entries(struct tcpcb *tp, uint64_t ts, int rm_oldest)
4371 struct tcp_sendfile_track *ent;
4372 uint64_t time_delta, oldest_delta;
4373 int i, oldest, oldest_set = 0, cnt_rm = 0;
4375 for(i = 0; i < MAX_TCP_TRK_REQ; i++) {
4376 ent = &tp->t_tcpreq_info[i];
4377 if (ent->flags != TCP_TRK_TRACK_FLG_USED) {
4379 * We only care about closed end ranges
4380 * that are allocated and have no sendfile
4381 * ever touching them. They would be in
4386 if (ts >= ent->localtime)
4387 time_delta = ts - ent->localtime;
4391 ((oldest_delta < time_delta) || (oldest_set == 0))) {
4394 oldest_delta = time_delta;
4396 if (tcp_stale_entry_time && (time_delta >= tcp_stale_entry_time)) {
4398 * No sendfile in a our time-limit
4402 tcp_req_log_req_info(tp, &tp->t_tcpreq_info[i], i, TCP_TRK_REQ_LOG_STALE,
4404 tcp_req_free_a_slot(tp, ent);
4407 if ((cnt_rm == 0) && rm_oldest && oldest_set) {
4408 ent = &tp->t_tcpreq_info[oldest];
4409 tcp_req_log_req_info(tp, &tp->t_tcpreq_info[i], i, TCP_TRK_REQ_LOG_STALE,
4411 tcp_req_free_a_slot(tp, ent);
4416 tcp_req_check_for_comp(struct tcpcb *tp, tcp_seq ack_point)
4419 struct tcp_sendfile_track *ent;
4421 /* Clean up any old closed end requests that are now completed */
4422 if (tp->t_tcpreq_req == 0)
4424 if (tp->t_tcpreq_closed == 0)
4426 for(i = 0; i < MAX_TCP_TRK_REQ; i++) {
4427 ent = &tp->t_tcpreq_info[i];
4428 /* Skip empty ones */
4429 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY)
4431 /* Skip open ones */
4432 if (ent->flags & TCP_TRK_TRACK_FLG_OPEN)
4434 if (SEQ_GEQ(ack_point, ent->end_seq)) {
4435 /* We are past it -- free it */
4436 tcp_req_log_req_info(tp, ent,
4437 i, TCP_TRK_REQ_LOG_FREED, 0, 0);
4438 tcp_req_free_a_slot(tp, ent);
4446 tcp_req_is_entry_comp(struct tcpcb *tp, struct tcp_sendfile_track *ent, tcp_seq ack_point)
4448 if (tp->t_tcpreq_req == 0)
4450 if (tp->t_tcpreq_closed == 0)
4452 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY)
4454 if (SEQ_GEQ(ack_point, ent->end_seq)) {
4460 struct tcp_sendfile_track *
4461 tcp_req_find_a_req_that_is_completed_by(struct tcpcb *tp, tcp_seq th_ack, int *ip)
4464 * Given an ack point (th_ack) walk through our entries and
4465 * return the first one found that th_ack goes past the
4468 struct tcp_sendfile_track *ent;
4471 if (tp->t_tcpreq_req == 0) {
4475 for(i = 0; i < MAX_TCP_TRK_REQ; i++) {
4476 ent = &tp->t_tcpreq_info[i];
4477 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY)
4479 if ((ent->flags & TCP_TRK_TRACK_FLG_OPEN) == 0) {
4480 if (SEQ_GEQ(th_ack, ent->end_seq)) {
4489 struct tcp_sendfile_track *
4490 tcp_req_find_req_for_seq(struct tcpcb *tp, tcp_seq seq)
4492 struct tcp_sendfile_track *ent;
4495 if (tp->t_tcpreq_req == 0) {
4499 for(i = 0; i < MAX_TCP_TRK_REQ; i++) {
4500 ent = &tp->t_tcpreq_info[i];
4501 tcp_req_log_req_info(tp, ent, i, TCP_TRK_REQ_LOG_SEARCH,
4503 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY) {
4506 if (ent->flags & TCP_TRK_TRACK_FLG_OPEN) {
4508 * An open end request only needs to
4509 * match the beginning seq or be
4510 * all we have (once we keep going on
4511 * a open end request we may have a seq
4514 if ((SEQ_GEQ(seq, ent->start_seq)) ||
4515 (tp->t_tcpreq_closed == 0))
4519 * For this one we need to
4520 * be a bit more careful if its
4521 * completed at least.
4523 if ((SEQ_GEQ(seq, ent->start_seq)) &&
4524 (SEQ_LT(seq, ent->end_seq))) {
4532 /* Should this be in its own file tcp_req.c ? */
4533 struct tcp_sendfile_track *
4534 tcp_req_alloc_req_full(struct tcpcb *tp, struct tcp_snd_req *req, uint64_t ts, int rec_dups)
4536 struct tcp_sendfile_track *fil;
4539 /* In case the stack does not check for completions do so now */
4540 tcp_req_check_for_comp(tp, tp->snd_una);
4541 /* Check for stale entries */
4542 if (tp->t_tcpreq_req)
4543 tcp_req_check_for_stale_entries(tp, ts,
4544 (tp->t_tcpreq_req >= MAX_TCP_TRK_REQ));
4545 /* Check to see if this is a duplicate of one not started */
4546 if (tp->t_tcpreq_req) {
4547 for(i = 0, allocated = 0; i < MAX_TCP_TRK_REQ; i++) {
4548 fil = &tp->t_tcpreq_info[i];
4549 if (fil->flags != TCP_TRK_TRACK_FLG_USED)
4551 if ((fil->timestamp == req->timestamp) &&
4552 (fil->start == req->start) &&
4553 ((fil->flags & TCP_TRK_TRACK_FLG_OPEN) ||
4554 (fil->end == req->end))) {
4556 * We already have this request
4557 * and it has not been started with sendfile.
4558 * This probably means the user was returned
4559 * a 4xx of some sort and its going to age
4560 * out, lets not duplicate it.
4566 /* Ok if there is no room at the inn we are in trouble */
4567 if (tp->t_tcpreq_req >= MAX_TCP_TRK_REQ) {
4568 tcp_trace_point(tp, TCP_TP_REQ_LOG_FAIL);
4569 for(i = 0; i < MAX_TCP_TRK_REQ; i++) {
4570 tcp_req_log_req_info(tp, &tp->t_tcpreq_info[i],
4571 i, TCP_TRK_REQ_LOG_ALLOCFAIL, 0, 0);
4575 for(i = 0, allocated = 0; i < MAX_TCP_TRK_REQ; i++) {
4576 fil = &tp->t_tcpreq_info[i];
4577 if (fil->flags == TCP_TRK_TRACK_FLG_EMPTY) {
4579 fil->flags = TCP_TRK_TRACK_FLG_USED;
4580 fil->timestamp = req->timestamp;
4581 fil->localtime = ts;
4582 fil->start = req->start;
4583 if (req->flags & TCP_LOG_HTTPD_RANGE_END) {
4584 fil->end = req->end;
4587 fil->flags |= TCP_TRK_TRACK_FLG_OPEN;
4590 * We can set the min boundaries to the TCP Sequence space,
4591 * but it might be found to be further up when sendfile
4592 * actually runs on this range (if it ever does).
4594 fil->sbcc_at_s = tptosocket(tp)->so_snd.sb_ccc;
4595 fil->start_seq = tp->snd_una +
4596 tptosocket(tp)->so_snd.sb_ccc;
4597 fil->end_seq = (fil->start_seq + ((uint32_t)(fil->end - fil->start)));
4598 if (tptosocket(tp)->so_snd.sb_tls_info) {
4600 * This session is doing TLS. Take a swag guess
4603 fil->end_seq += tcp_estimate_tls_overhead(
4604 tptosocket(tp), (fil->end - fil->start));
4607 if (fil->flags & TCP_TRK_TRACK_FLG_OPEN)
4608 tp->t_tcpreq_open++;
4610 tp->t_tcpreq_closed++;
4611 tcp_req_log_req_info(tp, fil, i,
4612 TCP_TRK_REQ_LOG_NEW, 0, 0);
4621 tcp_req_alloc_req(struct tcpcb *tp, union tcp_log_userdata *user, uint64_t ts)
4623 (void)tcp_req_alloc_req_full(tp, &user->tcp_req, ts, 1);
4628 tcp_log_socket_option(struct tcpcb *tp, uint32_t option_num, uint32_t option_val, int err)
4630 if (tcp_bblogging_on(tp)) {
4631 struct tcp_log_buffer *l;
4633 l = tcp_log_event(tp, NULL,
4634 &tptosocket(tp)->so_rcv,
4635 &tptosocket(tp)->so_snd,
4638 NULL, NULL, 0, NULL);
4640 l->tlb_flex1 = option_num;
4641 l->tlb_flex2 = option_val;
4647 tcp_get_srtt(struct tcpcb *tp, int granularity)
4651 KASSERT(granularity == TCP_TMR_GRANULARITY_USEC ||
4652 granularity == TCP_TMR_GRANULARITY_TICKS,
4653 ("%s: called with unexpected granularity %d", __func__,
4659 * We only support two granularities. If the stored granularity
4660 * does not match the granularity requested by the caller,
4661 * convert the stored value to the requested unit of granularity.
4663 if (tp->t_tmr_granularity != granularity) {
4664 if (granularity == TCP_TMR_GRANULARITY_USEC)
4665 srtt = TICKS_2_USEC(srtt);
4667 srtt = USEC_2_TICKS(srtt);
4671 * If the srtt is stored with ticks granularity, we need to
4672 * unshift to get the actual value. We do this after the
4673 * conversion above (if one was necessary) in order to maximize
4676 if (tp->t_tmr_granularity == TCP_TMR_GRANULARITY_TICKS)
4677 srtt = srtt >> TCP_RTT_SHIFT;