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>
35 __FBSDID("$FreeBSD$");
38 #include "opt_inet6.h"
39 #include "opt_ipsec.h"
40 #include "opt_kern_tls.h"
41 #include "opt_tcpdebug.h"
43 #include <sys/param.h>
44 #include <sys/systm.h>
46 #include <sys/callout.h>
47 #include <sys/eventhandler.h>
49 #include <sys/hhook.h>
51 #include <sys/kernel.h>
53 #include <sys/khelp.h>
58 #include <sys/qmath.h>
59 #include <sys/stats.h>
60 #include <sys/sysctl.h>
62 #include <sys/malloc.h>
63 #include <sys/refcount.h>
66 #include <sys/domain.h>
71 #include <sys/socket.h>
72 #include <sys/socketvar.h>
73 #include <sys/protosw.h>
74 #include <sys/random.h>
78 #include <net/route.h>
79 #include <net/route/nhop.h>
81 #include <net/if_var.h>
84 #include <netinet/in.h>
85 #include <netinet/in_fib.h>
86 #include <netinet/in_kdtrace.h>
87 #include <netinet/in_pcb.h>
88 #include <netinet/in_systm.h>
89 #include <netinet/in_var.h>
90 #include <netinet/ip.h>
91 #include <netinet/ip_icmp.h>
92 #include <netinet/ip_var.h>
94 #include <netinet/icmp6.h>
95 #include <netinet/ip6.h>
96 #include <netinet6/in6_fib.h>
97 #include <netinet6/in6_pcb.h>
98 #include <netinet6/ip6_var.h>
99 #include <netinet6/scope6_var.h>
100 #include <netinet6/nd6.h>
103 #include <netinet/tcp.h>
104 #include <netinet/tcp_fsm.h>
105 #include <netinet/tcp_seq.h>
106 #include <netinet/tcp_timer.h>
107 #include <netinet/tcp_var.h>
108 #include <netinet/tcp_log_buf.h>
109 #include <netinet/tcp_syncache.h>
110 #include <netinet/tcp_hpts.h>
111 #include <netinet/cc/cc.h>
113 #include <netinet6/tcp6_var.h>
115 #include <netinet/tcpip.h>
116 #include <netinet/tcp_fastopen.h>
118 #include <netinet/tcp_pcap.h>
121 #include <netinet/tcp_debug.h>
124 #include <netinet6/ip6protosw.h>
127 #include <netinet/tcp_offload.h>
129 #include <netinet/udp.h>
130 #include <netinet/udp_var.h>
132 #include <netipsec/ipsec_support.h>
134 #include <machine/in_cksum.h>
135 #include <crypto/siphash/siphash.h>
137 #include <security/mac/mac_framework.h>
139 VNET_DEFINE(int, tcp_mssdflt) = TCP_MSS;
141 VNET_DEFINE(int, tcp_v6mssdflt) = TCP6_MSS;
144 #ifdef NETFLIX_EXP_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_sack_to_ack_thresh = 700; /* 70 % */
155 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, sack_to_ack_thresh,
157 &tcp_sack_to_ack_thresh, 700,
158 "Percentage of sacks to acks we must see above (10.1 percent is 101)?");
159 int32_t tcp_sack_to_move_thresh = 600; /* 60 % */
160 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, move_thresh,
162 &tcp_sack_to_move_thresh, 600,
163 "Percentage of sack moves we must see above (10.1 percent is 101)");
164 int32_t tcp_restoral_thresh = 650; /* 65 % (sack:2:ack -5%) */
165 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, restore_thresh,
167 &tcp_restoral_thresh, 550,
168 "Percentage of sack to ack percentage we must see below to restore(10.1 percent is 101)");
169 int32_t tcp_sad_decay_val = 800;
170 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, decay_per,
172 &tcp_sad_decay_val, 800,
173 "The decay percentage (10.1 percent equals 101 )");
174 int32_t tcp_map_minimum = 500;
175 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, nummaps,
177 &tcp_map_minimum, 500,
178 "Number of Map enteries before we start detection");
179 int32_t tcp_attack_on_turns_on_logging = 0;
180 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, attacks_logged,
182 &tcp_attack_on_turns_on_logging, 0,
183 "When we have a positive hit on attack, do we turn on logging?");
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");
271 VNET_DEFINE(int, tcp_tolerate_missing_ts) = 0;
272 SYSCTL_INT(_net_inet_tcp, OID_AUTO, tolerate_missing_ts, CTLFLAG_VNET | CTLFLAG_RW,
273 &VNET_NAME(tcp_tolerate_missing_ts), 0,
274 "Tolerate missing TCP timestamps");
276 VNET_DEFINE(int, tcp_ts_offset_per_conn) = 1;
277 SYSCTL_INT(_net_inet_tcp, OID_AUTO, ts_offset_per_conn, CTLFLAG_VNET | CTLFLAG_RW,
278 &VNET_NAME(tcp_ts_offset_per_conn), 0,
279 "Initialize TCP timestamps per connection instead of per host pair");
281 /* How many connections are pacing */
282 static volatile uint32_t number_of_tcp_connections_pacing = 0;
283 static uint32_t shadow_num_connections = 0;
285 static int tcp_pacing_limit = 10000;
286 SYSCTL_INT(_net_inet_tcp, OID_AUTO, pacing_limit, CTLFLAG_RW,
287 &tcp_pacing_limit, 1000,
288 "If the TCP stack does pacing, is there a limit (-1 = no, 0 = no pacing N = number of connections)");
290 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, pacing_count, CTLFLAG_RD,
291 &shadow_num_connections, 0, "Number of TCP connections being paced");
293 static int tcp_log_debug = 0;
294 SYSCTL_INT(_net_inet_tcp, OID_AUTO, log_debug, CTLFLAG_RW,
295 &tcp_log_debug, 0, "Log errors caused by incoming TCP segments");
297 static int tcp_tcbhashsize;
298 SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RDTUN | CTLFLAG_NOFETCH,
299 &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable");
301 static int do_tcpdrain = 1;
302 SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0,
303 "Enable tcp_drain routine for extra help when low on mbufs");
305 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_VNET | CTLFLAG_RD,
306 &VNET_NAME(tcbinfo.ipi_count), 0, "Number of active PCBs");
308 VNET_DEFINE_STATIC(int, icmp_may_rst) = 1;
309 #define V_icmp_may_rst VNET(icmp_may_rst)
310 SYSCTL_INT(_net_inet_tcp, OID_AUTO, icmp_may_rst, CTLFLAG_VNET | CTLFLAG_RW,
311 &VNET_NAME(icmp_may_rst), 0,
312 "Certain ICMP unreachable messages may abort connections in SYN_SENT");
314 VNET_DEFINE_STATIC(int, tcp_isn_reseed_interval) = 0;
315 #define V_tcp_isn_reseed_interval VNET(tcp_isn_reseed_interval)
316 SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_VNET | CTLFLAG_RW,
317 &VNET_NAME(tcp_isn_reseed_interval), 0,
318 "Seconds between reseeding of ISN secret");
320 static int tcp_soreceive_stream;
321 SYSCTL_INT(_net_inet_tcp, OID_AUTO, soreceive_stream, CTLFLAG_RDTUN,
322 &tcp_soreceive_stream, 0, "Using soreceive_stream for TCP sockets");
324 VNET_DEFINE(uma_zone_t, sack_hole_zone);
325 #define V_sack_hole_zone VNET(sack_hole_zone)
326 VNET_DEFINE(uint32_t, tcp_map_entries_limit) = 0; /* unlimited */
328 sysctl_net_inet_tcp_map_limit_check(SYSCTL_HANDLER_ARGS)
333 new = V_tcp_map_entries_limit;
334 error = sysctl_handle_int(oidp, &new, 0, req);
335 if (error == 0 && req->newptr) {
336 /* only allow "0" and value > minimum */
337 if (new > 0 && new < TCP_MIN_MAP_ENTRIES_LIMIT)
340 V_tcp_map_entries_limit = new;
344 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, map_limit,
345 CTLFLAG_VNET | CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
346 &VNET_NAME(tcp_map_entries_limit), 0,
347 &sysctl_net_inet_tcp_map_limit_check, "IU",
348 "Total sendmap entries limit");
350 VNET_DEFINE(uint32_t, tcp_map_split_limit) = 0; /* unlimited */
351 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, split_limit, CTLFLAG_VNET | CTLFLAG_RW,
352 &VNET_NAME(tcp_map_split_limit), 0,
353 "Total sendmap split entries limit");
356 VNET_DEFINE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST+1]);
359 #define TS_OFFSET_SECRET_LENGTH SIPHASH_KEY_LENGTH
360 VNET_DEFINE_STATIC(u_char, ts_offset_secret[TS_OFFSET_SECRET_LENGTH]);
361 #define V_ts_offset_secret VNET(ts_offset_secret)
363 static int tcp_default_fb_init(struct tcpcb *tp);
364 static void tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged);
365 static int tcp_default_handoff_ok(struct tcpcb *tp);
366 static struct inpcb *tcp_notify(struct inpcb *, int);
367 static struct inpcb *tcp_mtudisc_notify(struct inpcb *, int);
368 static void tcp_mtudisc(struct inpcb *, int);
369 static char * tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th,
370 void *ip4hdr, const void *ip6hdr);
372 static struct tcp_function_block tcp_def_funcblk = {
373 .tfb_tcp_block_name = "freebsd",
374 .tfb_tcp_output = tcp_output,
375 .tfb_tcp_do_segment = tcp_do_segment,
376 .tfb_tcp_ctloutput = tcp_default_ctloutput,
377 .tfb_tcp_handoff_ok = tcp_default_handoff_ok,
378 .tfb_tcp_fb_init = tcp_default_fb_init,
379 .tfb_tcp_fb_fini = tcp_default_fb_fini,
382 static int tcp_fb_cnt = 0;
383 struct tcp_funchead t_functions;
384 static struct tcp_function_block *tcp_func_set_ptr = &tcp_def_funcblk;
386 static struct tcp_function_block *
387 find_tcp_functions_locked(struct tcp_function_set *fs)
389 struct tcp_function *f;
390 struct tcp_function_block *blk=NULL;
392 TAILQ_FOREACH(f, &t_functions, tf_next) {
393 if (strcmp(f->tf_name, fs->function_set_name) == 0) {
401 static struct tcp_function_block *
402 find_tcp_fb_locked(struct tcp_function_block *blk, struct tcp_function **s)
404 struct tcp_function_block *rblk=NULL;
405 struct tcp_function *f;
407 TAILQ_FOREACH(f, &t_functions, tf_next) {
408 if (f->tf_fb == blk) {
419 struct tcp_function_block *
420 find_and_ref_tcp_functions(struct tcp_function_set *fs)
422 struct tcp_function_block *blk;
424 rw_rlock(&tcp_function_lock);
425 blk = find_tcp_functions_locked(fs);
427 refcount_acquire(&blk->tfb_refcnt);
428 rw_runlock(&tcp_function_lock);
432 struct tcp_function_block *
433 find_and_ref_tcp_fb(struct tcp_function_block *blk)
435 struct tcp_function_block *rblk;
437 rw_rlock(&tcp_function_lock);
438 rblk = find_tcp_fb_locked(blk, NULL);
440 refcount_acquire(&rblk->tfb_refcnt);
441 rw_runlock(&tcp_function_lock);
445 static struct tcp_function_block *
446 find_and_ref_tcp_default_fb(void)
448 struct tcp_function_block *rblk;
450 rw_rlock(&tcp_function_lock);
451 rblk = tcp_func_set_ptr;
452 refcount_acquire(&rblk->tfb_refcnt);
453 rw_runlock(&tcp_function_lock);
458 tcp_switch_back_to_default(struct tcpcb *tp)
460 struct tcp_function_block *tfb;
462 KASSERT(tp->t_fb != &tcp_def_funcblk,
463 ("%s: called by the built-in default stack", __func__));
466 * Release the old stack. This function will either find a new one
469 if (tp->t_fb->tfb_tcp_fb_fini != NULL)
470 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0);
471 refcount_release(&tp->t_fb->tfb_refcnt);
474 * Now, we'll find a new function block to use.
475 * Start by trying the current user-selected
476 * default, unless this stack is the user-selected
479 tfb = find_and_ref_tcp_default_fb();
480 if (tfb == tp->t_fb) {
481 refcount_release(&tfb->tfb_refcnt);
484 /* Does the stack accept this connection? */
485 if (tfb != NULL && tfb->tfb_tcp_handoff_ok != NULL &&
486 (*tfb->tfb_tcp_handoff_ok)(tp)) {
487 refcount_release(&tfb->tfb_refcnt);
490 /* Try to use that stack. */
492 /* Initialize the new stack. If it succeeds, we are done. */
494 if (tp->t_fb->tfb_tcp_fb_init == NULL ||
495 (*tp->t_fb->tfb_tcp_fb_init)(tp) == 0)
499 * Initialization failed. Release the reference count on
502 refcount_release(&tfb->tfb_refcnt);
506 * If that wasn't feasible, use the built-in default
507 * stack which is not allowed to reject anyone.
509 tfb = find_and_ref_tcp_fb(&tcp_def_funcblk);
511 /* there always should be a default */
512 panic("Can't refer to tcp_def_funcblk");
514 if (tfb->tfb_tcp_handoff_ok != NULL) {
515 if ((*tfb->tfb_tcp_handoff_ok) (tp)) {
516 /* The default stack cannot say no */
517 panic("Default stack rejects a new session?");
521 if (tp->t_fb->tfb_tcp_fb_init != NULL &&
522 (*tp->t_fb->tfb_tcp_fb_init)(tp)) {
523 /* The default stack cannot fail */
524 panic("Default stack initialization failed");
529 tcp_recv_udp_tunneled_packet(struct mbuf *m, int off, struct inpcb *inp,
530 const struct sockaddr *sa, void *ctx)
541 TCPSTAT_INC(tcps_tunneled_pkts);
542 if ((m->m_flags & M_PKTHDR) == 0) {
543 /* Can't handle one that is not a pkt hdr */
544 TCPSTAT_INC(tcps_tunneled_errs);
547 thlen = sizeof(struct tcphdr);
548 if (m->m_len < off + sizeof(struct udphdr) + thlen &&
549 (m = m_pullup(m, off + sizeof(struct udphdr) + thlen)) == NULL) {
550 TCPSTAT_INC(tcps_tunneled_errs);
553 iph = mtod(m, struct ip *);
554 uh = (struct udphdr *)((caddr_t)iph + off);
555 th = (struct tcphdr *)(uh + 1);
556 thlen = th->th_off << 2;
557 if (m->m_len < off + sizeof(struct udphdr) + thlen) {
558 m = m_pullup(m, off + sizeof(struct udphdr) + thlen);
560 TCPSTAT_INC(tcps_tunneled_errs);
563 iph = mtod(m, struct ip *);
564 uh = (struct udphdr *)((caddr_t)iph + off);
565 th = (struct tcphdr *)(uh + 1);
568 m->m_pkthdr.tcp_tun_port = port = uh->uh_sport;
569 bcopy(th, uh, m->m_len - off);
570 m->m_len -= sizeof(struct udphdr);
571 m->m_pkthdr.len -= sizeof(struct udphdr);
573 * We use the same algorithm for
574 * both UDP and TCP for c-sum. So
575 * the code in tcp_input will skip
576 * the checksum. So we do nothing
577 * with the flag (m->m_pkthdr.csum_flags).
582 iph->ip_len = htons(ntohs(iph->ip_len) - sizeof(struct udphdr));
583 tcp_input_with_port(&m, &off, IPPROTO_TCP, port);
587 case IPV6_VERSION >> 4:
588 ip6 = mtod(m, struct ip6_hdr *);
589 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - sizeof(struct udphdr));
590 tcp6_input_with_port(&m, &off, IPPROTO_TCP, port);
603 sysctl_net_inet_default_tcp_functions(SYSCTL_HANDLER_ARGS)
606 struct tcp_function_set fs;
607 struct tcp_function_block *blk;
609 memset(&fs, 0, sizeof(fs));
610 rw_rlock(&tcp_function_lock);
611 blk = find_tcp_fb_locked(tcp_func_set_ptr, NULL);
614 strcpy(fs.function_set_name, blk->tfb_tcp_block_name);
615 fs.pcbcnt = blk->tfb_refcnt;
617 rw_runlock(&tcp_function_lock);
618 error = sysctl_handle_string(oidp, fs.function_set_name,
619 sizeof(fs.function_set_name), req);
621 /* Check for error or no change */
622 if (error != 0 || req->newptr == NULL)
625 rw_wlock(&tcp_function_lock);
626 blk = find_tcp_functions_locked(&fs);
628 (blk->tfb_flags & TCP_FUNC_BEING_REMOVED)) {
632 tcp_func_set_ptr = blk;
634 rw_wunlock(&tcp_function_lock);
638 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_default,
639 CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
640 NULL, 0, sysctl_net_inet_default_tcp_functions, "A",
641 "Set/get the default TCP functions");
644 sysctl_net_inet_list_available(SYSCTL_HANDLER_ARGS)
646 int error, cnt, linesz;
647 struct tcp_function *f;
653 rw_rlock(&tcp_function_lock);
654 TAILQ_FOREACH(f, &t_functions, tf_next) {
657 rw_runlock(&tcp_function_lock);
659 bufsz = (cnt+2) * ((TCP_FUNCTION_NAME_LEN_MAX * 2) + 13) + 1;
660 buffer = malloc(bufsz, M_TEMP, M_WAITOK);
665 linesz = snprintf(cp, bufsz, "\n%-32s%c %-32s %s\n", "Stack", 'D',
666 "Alias", "PCB count");
671 rw_rlock(&tcp_function_lock);
672 TAILQ_FOREACH(f, &t_functions, tf_next) {
673 alias = (f->tf_name != f->tf_fb->tfb_tcp_block_name);
674 linesz = snprintf(cp, bufsz, "%-32s%c %-32s %u\n",
675 f->tf_fb->tfb_tcp_block_name,
676 (f->tf_fb == tcp_func_set_ptr) ? '*' : ' ',
677 alias ? f->tf_name : "-",
678 f->tf_fb->tfb_refcnt);
679 if (linesz >= bufsz) {
687 rw_runlock(&tcp_function_lock);
689 error = sysctl_handle_string(oidp, buffer, outsz + 1, req);
690 free(buffer, M_TEMP);
694 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_available,
695 CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
696 NULL, 0, sysctl_net_inet_list_available, "A",
697 "list available TCP Function sets");
699 VNET_DEFINE(int, tcp_udp_tunneling_port) = TCP_TUNNELING_PORT_DEFAULT;
702 VNET_DEFINE(struct socket *, udp4_tun_socket) = NULL;
703 #define V_udp4_tun_socket VNET(udp4_tun_socket)
706 VNET_DEFINE(struct socket *, udp6_tun_socket) = NULL;
707 #define V_udp6_tun_socket VNET(udp6_tun_socket)
711 tcp_over_udp_stop(void)
714 * This function assumes sysctl caller holds inp_rinfo_lock()
718 if (V_udp4_tun_socket != NULL) {
719 soclose(V_udp4_tun_socket);
720 V_udp4_tun_socket = NULL;
724 if (V_udp6_tun_socket != NULL) {
725 soclose(V_udp6_tun_socket);
726 V_udp6_tun_socket = NULL;
732 tcp_over_udp_start(void)
737 struct sockaddr_in sin;
740 struct sockaddr_in6 sin6;
743 * This function assumes sysctl caller holds inp_info_rlock()
746 port = V_tcp_udp_tunneling_port;
747 if (ntohs(port) == 0) {
748 /* Must have a port set */
752 if (V_udp4_tun_socket != NULL) {
753 /* Already running -- must stop first */
758 if (V_udp6_tun_socket != NULL) {
759 /* Already running -- must stop first */
764 if ((ret = socreate(PF_INET, &V_udp4_tun_socket,
765 SOCK_DGRAM, IPPROTO_UDP,
766 curthread->td_ucred, curthread))) {
770 /* Call the special UDP hook. */
771 if ((ret = udp_set_kernel_tunneling(V_udp4_tun_socket,
772 tcp_recv_udp_tunneled_packet,
778 /* Ok, we have a socket, bind it to the port. */
779 memset(&sin, 0, sizeof(struct sockaddr_in));
780 sin.sin_len = sizeof(struct sockaddr_in);
781 sin.sin_family = AF_INET;
782 sin.sin_port = htons(port);
783 if ((ret = sobind(V_udp4_tun_socket,
784 (struct sockaddr *)&sin, curthread))) {
790 if ((ret = socreate(PF_INET6, &V_udp6_tun_socket,
791 SOCK_DGRAM, IPPROTO_UDP,
792 curthread->td_ucred, curthread))) {
796 /* Call the special UDP hook. */
797 if ((ret = udp_set_kernel_tunneling(V_udp6_tun_socket,
798 tcp_recv_udp_tunneled_packet,
799 tcp6_ctlinput_viaudp,
804 /* Ok, we have a socket, bind it to the port. */
805 memset(&sin6, 0, sizeof(struct sockaddr_in6));
806 sin6.sin6_len = sizeof(struct sockaddr_in6);
807 sin6.sin6_family = AF_INET6;
808 sin6.sin6_port = htons(port);
809 if ((ret = sobind(V_udp6_tun_socket,
810 (struct sockaddr *)&sin6, curthread))) {
819 sysctl_net_inet_tcp_udp_tunneling_port_check(SYSCTL_HANDLER_ARGS)
824 old = V_tcp_udp_tunneling_port;
826 error = sysctl_handle_int(oidp, &new, 0, req);
828 (req->newptr != NULL)) {
829 if ((new < TCP_TUNNELING_PORT_MIN) ||
830 (new > TCP_TUNNELING_PORT_MAX)) {
833 V_tcp_udp_tunneling_port = new;
838 error = tcp_over_udp_start();
845 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, udp_tunneling_port,
846 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
847 &VNET_NAME(tcp_udp_tunneling_port),
848 0, &sysctl_net_inet_tcp_udp_tunneling_port_check, "IU",
849 "Tunneling port for tcp over udp");
851 VNET_DEFINE(int, tcp_udp_tunneling_overhead) = TCP_TUNNELING_OVERHEAD_DEFAULT;
854 sysctl_net_inet_tcp_udp_tunneling_overhead_check(SYSCTL_HANDLER_ARGS)
858 new = V_tcp_udp_tunneling_overhead;
859 error = sysctl_handle_int(oidp, &new, 0, req);
860 if (error == 0 && req->newptr) {
861 if ((new < TCP_TUNNELING_OVERHEAD_MIN) ||
862 (new > TCP_TUNNELING_OVERHEAD_MAX))
865 V_tcp_udp_tunneling_overhead = new;
870 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, udp_tunneling_overhead,
871 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
872 &VNET_NAME(tcp_udp_tunneling_overhead),
873 0, &sysctl_net_inet_tcp_udp_tunneling_overhead_check, "IU",
874 "MSS reduction when using tcp over udp");
877 * Exports one (struct tcp_function_info) for each alias/name.
880 sysctl_net_inet_list_func_info(SYSCTL_HANDLER_ARGS)
883 struct tcp_function *f;
884 struct tcp_function_info tfi;
887 * We don't allow writes.
889 if (req->newptr != NULL)
893 * Wire the old buffer so we can directly copy the functions to
894 * user space without dropping the lock.
896 if (req->oldptr != NULL) {
897 error = sysctl_wire_old_buffer(req, 0);
903 * Walk the list and copy out matching entries. If INVARIANTS
904 * is compiled in, also walk the list to verify the length of
905 * the list matches what we have recorded.
907 rw_rlock(&tcp_function_lock);
911 if (req->oldptr == NULL) {
916 TAILQ_FOREACH(f, &t_functions, tf_next) {
920 if (req->oldptr != NULL) {
921 bzero(&tfi, sizeof(tfi));
922 tfi.tfi_refcnt = f->tf_fb->tfb_refcnt;
923 tfi.tfi_id = f->tf_fb->tfb_id;
924 (void)strlcpy(tfi.tfi_alias, f->tf_name,
925 sizeof(tfi.tfi_alias));
926 (void)strlcpy(tfi.tfi_name,
927 f->tf_fb->tfb_tcp_block_name, sizeof(tfi.tfi_name));
928 error = SYSCTL_OUT(req, &tfi, sizeof(tfi));
930 * Don't stop on error, as that is the
931 * mechanism we use to accumulate length
932 * information if the buffer was too short.
936 KASSERT(cnt == tcp_fb_cnt,
937 ("%s: cnt (%d) != tcp_fb_cnt (%d)", __func__, cnt, tcp_fb_cnt));
941 rw_runlock(&tcp_function_lock);
942 if (req->oldptr == NULL)
943 error = SYSCTL_OUT(req, NULL,
944 (cnt + 1) * sizeof(struct tcp_function_info));
949 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, function_info,
950 CTLTYPE_OPAQUE | CTLFLAG_SKIP | CTLFLAG_RD | CTLFLAG_MPSAFE,
951 NULL, 0, sysctl_net_inet_list_func_info, "S,tcp_function_info",
952 "List TCP function block name-to-ID mappings");
955 * tfb_tcp_handoff_ok() function for the default stack.
956 * Note that we'll basically try to take all comers.
959 tcp_default_handoff_ok(struct tcpcb *tp)
966 * tfb_tcp_fb_init() function for the default stack.
968 * This handles making sure we have appropriate timers set if you are
969 * transitioning a socket that has some amount of setup done.
971 * The init() fuction from the default can *never* return non-zero i.e.
972 * it is required to always succeed since it is the stack of last resort!
975 tcp_default_fb_init(struct tcpcb *tp)
980 INP_WLOCK_ASSERT(tp->t_inpcb);
982 KASSERT(tp->t_state >= 0 && tp->t_state < TCPS_TIME_WAIT,
983 ("%s: connection %p in unexpected state %d", __func__, tp,
987 * Nothing to do for ESTABLISHED or LISTEN states. And, we don't
988 * know what to do for unexpected states (which includes TIME_WAIT).
990 if (tp->t_state <= TCPS_LISTEN || tp->t_state >= TCPS_TIME_WAIT)
994 * Make sure some kind of transmission timer is set if there is
997 so = tp->t_inpcb->inp_socket;
998 if ((!TCPS_HAVEESTABLISHED(tp->t_state) || sbavail(&so->so_snd) ||
999 tp->snd_una != tp->snd_max) && !(tcp_timer_active(tp, TT_REXMT) ||
1000 tcp_timer_active(tp, TT_PERSIST))) {
1002 * If the session has established and it looks like it should
1003 * be in the persist state, set the persist timer. Otherwise,
1004 * set the retransmit timer.
1006 if (TCPS_HAVEESTABLISHED(tp->t_state) && tp->snd_wnd == 0 &&
1007 (int32_t)(tp->snd_nxt - tp->snd_una) <
1008 (int32_t)sbavail(&so->so_snd))
1011 tcp_timer_activate(tp, TT_REXMT, tp->t_rxtcur);
1014 /* All non-embryonic sessions get a keepalive timer. */
1015 if (!tcp_timer_active(tp, TT_KEEP))
1016 tcp_timer_activate(tp, TT_KEEP,
1017 TCPS_HAVEESTABLISHED(tp->t_state) ? TP_KEEPIDLE(tp) :
1021 * Make sure critical variables are initialized
1022 * if transitioning while in Recovery.
1024 if IN_FASTRECOVERY(tp->t_flags) {
1025 if (tp->sackhint.recover_fs == 0)
1026 tp->sackhint.recover_fs = max(1,
1027 tp->snd_nxt - tp->snd_una);
1034 * tfb_tcp_fb_fini() function for the default stack.
1036 * This changes state as necessary (or prudent) to prepare for another stack
1037 * to assume responsibility for the connection.
1040 tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged)
1043 INP_WLOCK_ASSERT(tp->t_inpcb);
1048 * Target size of TCP PCB hash tables. Must be a power of two.
1050 * Note that this can be overridden by the kernel environment
1051 * variable net.inet.tcp.tcbhashsize
1054 #define TCBHASHSIZE 0
1059 * Callouts should be moved into struct tcp directly. They are currently
1060 * separate because the tcpcb structure is exported to userland for sysctl
1061 * parsing purposes, which do not know about callouts.
1065 struct tcp_timer tt;
1072 VNET_DEFINE_STATIC(uma_zone_t, tcpcb_zone);
1073 #define V_tcpcb_zone VNET(tcpcb_zone)
1075 MALLOC_DEFINE(M_TCPLOG, "tcplog", "TCP address and flags print buffers");
1076 MALLOC_DEFINE(M_TCPFUNCTIONS, "tcpfunc", "TCP function set memory");
1078 static struct mtx isn_mtx;
1080 #define ISN_LOCK_INIT() mtx_init(&isn_mtx, "isn_mtx", NULL, MTX_DEF)
1081 #define ISN_LOCK() mtx_lock(&isn_mtx)
1082 #define ISN_UNLOCK() mtx_unlock(&isn_mtx)
1085 * TCP initialization.
1088 tcp_zone_change(void *tag)
1091 uma_zone_set_max(V_tcbinfo.ipi_zone, maxsockets);
1092 uma_zone_set_max(V_tcpcb_zone, maxsockets);
1093 tcp_tw_zone_change();
1097 tcp_inpcb_init(void *mem, int size, int flags)
1099 struct inpcb *inp = mem;
1101 INP_LOCK_INIT(inp, "inp", "tcpinp");
1106 * Take a value and get the next power of 2 that doesn't overflow.
1107 * Used to size the tcp_inpcb hash buckets.
1110 maketcp_hashsize(int size)
1116 * get the next power of 2 higher than maxsockets.
1118 hashsize = 1 << fls(size);
1119 /* catch overflow, and just go one power of 2 smaller */
1120 if (hashsize < size) {
1121 hashsize = 1 << (fls(size) - 1);
1126 static volatile int next_tcp_stack_id = 1;
1129 * Register a TCP function block with the name provided in the names
1130 * array. (Note that this function does NOT automatically register
1131 * blk->tfb_tcp_block_name as a stack name. Therefore, you should
1132 * explicitly include blk->tfb_tcp_block_name in the list of names if
1133 * you wish to register the stack with that name.)
1135 * Either all name registrations will succeed or all will fail. If
1136 * a name registration fails, the function will update the num_names
1137 * argument to point to the array index of the name that encountered
1140 * Returns 0 on success, or an error code on failure.
1143 register_tcp_functions_as_names(struct tcp_function_block *blk, int wait,
1144 const char *names[], int *num_names)
1146 struct tcp_function *n;
1147 struct tcp_function_set fs;
1150 KASSERT(names != NULL && *num_names > 0,
1151 ("%s: Called with 0-length name list", __func__));
1152 KASSERT(names != NULL, ("%s: Called with NULL name list", __func__));
1153 KASSERT(rw_initialized(&tcp_function_lock),
1154 ("%s: called too early", __func__));
1156 if ((blk->tfb_tcp_output == NULL) ||
1157 (blk->tfb_tcp_do_segment == NULL) ||
1158 (blk->tfb_tcp_ctloutput == NULL) ||
1159 (strlen(blk->tfb_tcp_block_name) == 0)) {
1161 * These functions are required and you
1167 if (blk->tfb_tcp_timer_stop_all ||
1168 blk->tfb_tcp_timer_activate ||
1169 blk->tfb_tcp_timer_active ||
1170 blk->tfb_tcp_timer_stop) {
1172 * If you define one timer function you
1173 * must have them all.
1175 if ((blk->tfb_tcp_timer_stop_all == NULL) ||
1176 (blk->tfb_tcp_timer_activate == NULL) ||
1177 (blk->tfb_tcp_timer_active == NULL) ||
1178 (blk->tfb_tcp_timer_stop == NULL)) {
1184 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) {
1189 refcount_init(&blk->tfb_refcnt, 0);
1190 blk->tfb_id = atomic_fetchadd_int(&next_tcp_stack_id, 1);
1191 for (i = 0; i < *num_names; i++) {
1192 n = malloc(sizeof(struct tcp_function), M_TCPFUNCTIONS, wait);
1199 (void)strlcpy(fs.function_set_name, names[i],
1200 sizeof(fs.function_set_name));
1201 rw_wlock(&tcp_function_lock);
1202 if (find_tcp_functions_locked(&fs) != NULL) {
1203 /* Duplicate name space not allowed */
1204 rw_wunlock(&tcp_function_lock);
1205 free(n, M_TCPFUNCTIONS);
1209 (void)strlcpy(n->tf_name, names[i], sizeof(n->tf_name));
1210 TAILQ_INSERT_TAIL(&t_functions, n, tf_next);
1212 rw_wunlock(&tcp_function_lock);
1218 * Deregister the names we just added. Because registration failed
1219 * for names[i], we don't need to deregister that name.
1222 rw_wlock(&tcp_function_lock);
1224 TAILQ_FOREACH(n, &t_functions, tf_next) {
1225 if (!strncmp(n->tf_name, names[i],
1226 TCP_FUNCTION_NAME_LEN_MAX)) {
1227 TAILQ_REMOVE(&t_functions, n, tf_next);
1230 free(n, M_TCPFUNCTIONS);
1235 rw_wunlock(&tcp_function_lock);
1240 * Register a TCP function block using the name provided in the name
1243 * Returns 0 on success, or an error code on failure.
1246 register_tcp_functions_as_name(struct tcp_function_block *blk, const char *name,
1249 const char *name_list[1];
1254 name_list[0] = name;
1256 name_list[0] = blk->tfb_tcp_block_name;
1257 rv = register_tcp_functions_as_names(blk, wait, name_list, &num_names);
1262 * Register a TCP function block using the name defined in
1263 * blk->tfb_tcp_block_name.
1265 * Returns 0 on success, or an error code on failure.
1268 register_tcp_functions(struct tcp_function_block *blk, int wait)
1271 return (register_tcp_functions_as_name(blk, NULL, wait));
1275 * Deregister all names associated with a function block. This
1276 * functionally removes the function block from use within the system.
1278 * When called with a true quiesce argument, mark the function block
1279 * as being removed so no more stacks will use it and determine
1280 * whether the removal would succeed.
1282 * When called with a false quiesce argument, actually attempt the
1285 * When called with a force argument, attempt to switch all TCBs to
1286 * use the default stack instead of returning EBUSY.
1288 * Returns 0 on success (or if the removal would succeed, or an error
1292 deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce,
1295 struct tcp_function *f;
1297 if (blk == &tcp_def_funcblk) {
1298 /* You can't un-register the default */
1301 rw_wlock(&tcp_function_lock);
1302 if (blk == tcp_func_set_ptr) {
1303 /* You can't free the current default */
1304 rw_wunlock(&tcp_function_lock);
1307 /* Mark the block so no more stacks can use it. */
1308 blk->tfb_flags |= TCP_FUNC_BEING_REMOVED;
1310 * If TCBs are still attached to the stack, attempt to switch them
1311 * to the default stack.
1313 if (force && blk->tfb_refcnt) {
1316 VNET_ITERATOR_DECL(vnet_iter);
1318 rw_wunlock(&tcp_function_lock);
1321 VNET_FOREACH(vnet_iter) {
1322 CURVNET_SET(vnet_iter);
1323 INP_INFO_WLOCK(&V_tcbinfo);
1324 CK_LIST_FOREACH(inp, V_tcbinfo.ipi_listhead, inp_list) {
1326 if (inp->inp_flags & INP_TIMEWAIT) {
1330 tp = intotcpcb(inp);
1331 if (tp == NULL || tp->t_fb != blk) {
1335 tcp_switch_back_to_default(tp);
1338 INP_INFO_WUNLOCK(&V_tcbinfo);
1341 VNET_LIST_RUNLOCK();
1343 rw_wlock(&tcp_function_lock);
1345 if (blk->tfb_refcnt) {
1346 /* TCBs still attached. */
1347 rw_wunlock(&tcp_function_lock);
1352 rw_wunlock(&tcp_function_lock);
1355 /* Remove any function names that map to this function block. */
1356 while (find_tcp_fb_locked(blk, &f) != NULL) {
1357 TAILQ_REMOVE(&t_functions, f, tf_next);
1360 free(f, M_TCPFUNCTIONS);
1362 rw_wunlock(&tcp_function_lock);
1369 const char *tcbhash_tuneable;
1372 tcbhash_tuneable = "net.inet.tcp.tcbhashsize";
1375 if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN,
1376 &V_tcp_hhh[HHOOK_TCP_EST_IN], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
1377 printf("%s: WARNING: unable to register helper hook\n", __func__);
1378 if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT,
1379 &V_tcp_hhh[HHOOK_TCP_EST_OUT], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0)
1380 printf("%s: WARNING: unable to register helper hook\n", __func__);
1383 if (tcp_stats_init())
1384 printf("%s: WARNING: unable to initialise TCP stats\n",
1387 hashsize = TCBHASHSIZE;
1388 TUNABLE_INT_FETCH(tcbhash_tuneable, &hashsize);
1389 if (hashsize == 0) {
1391 * Auto tune the hash size based on maxsockets.
1392 * A perfect hash would have a 1:1 mapping
1393 * (hashsize = maxsockets) however it's been
1394 * suggested that O(2) average is better.
1396 hashsize = maketcp_hashsize(maxsockets / 4);
1398 * Our historical default is 512,
1399 * do not autotune lower than this.
1403 if (bootverbose && IS_DEFAULT_VNET(curvnet))
1404 printf("%s: %s auto tuned to %d\n", __func__,
1405 tcbhash_tuneable, hashsize);
1408 * We require a hashsize to be a power of two.
1409 * Previously if it was not a power of two we would just reset it
1410 * back to 512, which could be a nasty surprise if you did not notice
1411 * the error message.
1412 * Instead what we do is clip it to the closest power of two lower
1413 * than the specified hash value.
1415 if (!powerof2(hashsize)) {
1416 int oldhashsize = hashsize;
1418 hashsize = maketcp_hashsize(hashsize);
1419 /* prevent absurdly low value */
1422 printf("%s: WARNING: TCB hash size not a power of 2, "
1423 "clipped from %d to %d.\n", __func__, oldhashsize,
1426 in_pcbinfo_init(&V_tcbinfo, "tcp", &V_tcb, hashsize, hashsize,
1427 "tcp_inpcb", tcp_inpcb_init, IPI_HASHFIELDS_4TUPLE);
1430 * These have to be type stable for the benefit of the timers.
1432 V_tcpcb_zone = uma_zcreate("tcpcb", sizeof(struct tcpcb_mem),
1433 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
1434 uma_zone_set_max(V_tcpcb_zone, maxsockets);
1435 uma_zone_set_warning(V_tcpcb_zone, "kern.ipc.maxsockets limit reached");
1441 TUNABLE_INT_FETCH("net.inet.tcp.sack.enable", &V_tcp_do_sack);
1442 V_sack_hole_zone = uma_zcreate("sackhole", sizeof(struct sackhole),
1443 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0);
1445 tcp_fastopen_init();
1447 /* Skip initialization of globals for non-default instances. */
1448 if (!IS_DEFAULT_VNET(curvnet))
1451 tcp_reass_global_init();
1453 /* XXX virtualize those bellow? */
1454 tcp_delacktime = TCPTV_DELACK;
1455 tcp_keepinit = TCPTV_KEEP_INIT;
1456 tcp_keepidle = TCPTV_KEEP_IDLE;
1457 tcp_keepintvl = TCPTV_KEEPINTVL;
1458 tcp_maxpersistidle = TCPTV_KEEP_IDLE;
1459 tcp_msl = TCPTV_MSL;
1460 tcp_rexmit_initial = TCPTV_RTOBASE;
1461 if (tcp_rexmit_initial < 1)
1462 tcp_rexmit_initial = 1;
1463 tcp_rexmit_min = TCPTV_MIN;
1464 if (tcp_rexmit_min < 1)
1466 tcp_persmin = TCPTV_PERSMIN;
1467 tcp_persmax = TCPTV_PERSMAX;
1468 tcp_rexmit_slop = TCPTV_CPU_VAR;
1469 tcp_finwait2_timeout = TCPTV_FINWAIT2_TIMEOUT;
1470 tcp_tcbhashsize = hashsize;
1472 /* Setup the tcp function block list */
1473 TAILQ_INIT(&t_functions);
1474 rw_init(&tcp_function_lock, "tcp_func_lock");
1475 register_tcp_functions(&tcp_def_funcblk, M_WAITOK);
1477 /* Initialize the TCP logging data. */
1480 arc4rand(&V_ts_offset_secret, sizeof(V_ts_offset_secret), 0);
1482 if (tcp_soreceive_stream) {
1484 tcp_usrreqs.pru_soreceive = soreceive_stream;
1487 tcp6_usrreqs.pru_soreceive = soreceive_stream;
1492 #define TCP_MINPROTOHDR (sizeof(struct ip6_hdr) + sizeof(struct tcphdr))
1494 #define TCP_MINPROTOHDR (sizeof(struct tcpiphdr))
1496 if (max_protohdr < TCP_MINPROTOHDR)
1497 max_protohdr = TCP_MINPROTOHDR;
1498 if (max_linkhdr + TCP_MINPROTOHDR > MHLEN)
1500 #undef TCP_MINPROTOHDR
1503 EVENTHANDLER_REGISTER(shutdown_pre_sync, tcp_fini, NULL,
1504 SHUTDOWN_PRI_DEFAULT);
1505 EVENTHANDLER_REGISTER(maxsockets_change, tcp_zone_change, NULL,
1506 EVENTHANDLER_PRI_ANY);
1508 tcp_inp_lro_direct_queue = counter_u64_alloc(M_WAITOK);
1509 tcp_inp_lro_wokeup_queue = counter_u64_alloc(M_WAITOK);
1510 tcp_inp_lro_compressed = counter_u64_alloc(M_WAITOK);
1511 tcp_inp_lro_locks_taken = counter_u64_alloc(M_WAITOK);
1512 tcp_extra_mbuf = counter_u64_alloc(M_WAITOK);
1513 tcp_would_have_but = counter_u64_alloc(M_WAITOK);
1514 tcp_comp_total = counter_u64_alloc(M_WAITOK);
1515 tcp_uncomp_total = counter_u64_alloc(M_WAITOK);
1523 tcp_destroy(void *unused __unused)
1531 * All our processes are gone, all our sockets should be cleaned
1532 * up, which means, we should be past the tcp_discardcb() calls.
1533 * Sleep to let all tcpcb timers really disappear and cleanup.
1536 INP_LIST_RLOCK(&V_tcbinfo);
1537 n = V_tcbinfo.ipi_count;
1538 INP_LIST_RUNLOCK(&V_tcbinfo);
1541 pause("tcpdes", hz / 10);
1546 in_pcbinfo_destroy(&V_tcbinfo);
1547 /* tcp_discardcb() clears the sack_holes up. */
1548 uma_zdestroy(V_sack_hole_zone);
1549 uma_zdestroy(V_tcpcb_zone);
1552 * Cannot free the zone until all tcpcbs are released as we attach
1553 * the allocations to them.
1555 tcp_fastopen_destroy();
1558 error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_IN]);
1560 printf("%s: WARNING: unable to deregister helper hook "
1561 "type=%d, id=%d: error %d returned\n", __func__,
1562 HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN, error);
1564 error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_OUT]);
1566 printf("%s: WARNING: unable to deregister helper hook "
1567 "type=%d, id=%d: error %d returned\n", __func__,
1568 HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT, error);
1572 VNET_SYSUNINIT(tcp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, tcp_destroy, NULL);
1582 * Fill in the IP and TCP headers for an outgoing packet, given the tcpcb.
1583 * tcp_template used to store this data in mbufs, but we now recopy it out
1584 * of the tcpcb each time to conserve mbufs.
1587 tcpip_fillheaders(struct inpcb *inp, uint16_t port, void *ip_ptr, void *tcp_ptr)
1589 struct tcphdr *th = (struct tcphdr *)tcp_ptr;
1591 INP_WLOCK_ASSERT(inp);
1594 if ((inp->inp_vflag & INP_IPV6) != 0) {
1595 struct ip6_hdr *ip6;
1597 ip6 = (struct ip6_hdr *)ip_ptr;
1598 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
1599 (inp->inp_flow & IPV6_FLOWINFO_MASK);
1600 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
1601 (IPV6_VERSION & IPV6_VERSION_MASK);
1603 ip6->ip6_nxt = IPPROTO_TCP;
1605 ip6->ip6_nxt = IPPROTO_UDP;
1606 ip6->ip6_plen = htons(sizeof(struct tcphdr));
1607 ip6->ip6_src = inp->in6p_laddr;
1608 ip6->ip6_dst = inp->in6p_faddr;
1611 #if defined(INET6) && defined(INET)
1618 ip = (struct ip *)ip_ptr;
1619 ip->ip_v = IPVERSION;
1621 ip->ip_tos = inp->inp_ip_tos;
1625 ip->ip_ttl = inp->inp_ip_ttl;
1628 ip->ip_p = IPPROTO_TCP;
1630 ip->ip_p = IPPROTO_UDP;
1631 ip->ip_src = inp->inp_laddr;
1632 ip->ip_dst = inp->inp_faddr;
1635 th->th_sport = inp->inp_lport;
1636 th->th_dport = inp->inp_fport;
1644 th->th_sum = 0; /* in_pseudo() is called later for ipv4 */
1648 * Create template to be used to send tcp packets on a connection.
1649 * Allocates an mbuf and fills in a skeletal tcp/ip header. The only
1650 * use for this function is in keepalives, which use tcp_respond.
1653 tcpip_maketemplate(struct inpcb *inp)
1657 t = malloc(sizeof(*t), M_TEMP, M_NOWAIT);
1660 tcpip_fillheaders(inp, 0, (void *)&t->tt_ipgen, (void *)&t->tt_t);
1665 * Send a single message to the TCP at address specified by
1666 * the given TCP/IP header. If m == NULL, then we make a copy
1667 * of the tcpiphdr at th and send directly to the addressed host.
1668 * This is used to force keep alive messages out using the TCP
1669 * template for a connection. If flags are given then we send
1670 * a message back to the TCP which originated the segment th,
1671 * and discard the mbuf containing it and any other attached mbufs.
1673 * In any case the ack and sequence number of the transmitted
1674 * segment are as specified by the parameters.
1676 * NOTE: If m != NULL, then th must point to *inside* the mbuf.
1679 tcp_respond(struct tcpcb *tp, void *ipgen, struct tcphdr *th, struct mbuf *m,
1680 tcp_seq ack, tcp_seq seq, int flags)
1686 struct udphdr *uh = NULL;
1690 struct ip6_hdr *ip6;
1693 int optlen, tlen, win, ulen;
1697 KASSERT(tp != NULL || m != NULL, ("tcp_respond: tp and m both NULL"));
1701 isipv6 = ((struct ip *)ipgen)->ip_v == (IPV6_VERSION >> 4);
1708 KASSERT(inp != NULL, ("tcp control block w/o inpcb"));
1709 INP_LOCK_ASSERT(inp);
1715 if (isipv6 && ip6 && (ip6->ip6_nxt == IPPROTO_UDP))
1716 port = m->m_pkthdr.tcp_tun_port;
1719 if (ip && (ip->ip_p == IPPROTO_UDP))
1720 port = m->m_pkthdr.tcp_tun_port;
1729 if (!(flags & TH_RST)) {
1730 win = sbspace(&inp->inp_socket->so_rcv);
1731 if (win > TCP_MAXWIN << tp->rcv_scale)
1732 win = TCP_MAXWIN << tp->rcv_scale;
1734 if ((tp->t_flags & TF_NOOPT) == 0)
1738 m = m_gethdr(M_NOWAIT, MT_DATA);
1741 m->m_data += max_linkhdr;
1744 bcopy((caddr_t)ip6, mtod(m, caddr_t),
1745 sizeof(struct ip6_hdr));
1746 ip6 = mtod(m, struct ip6_hdr *);
1747 nth = (struct tcphdr *)(ip6 + 1);
1749 /* Insert a UDP header */
1750 uh = (struct udphdr *)nth;
1751 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1752 uh->uh_dport = port;
1753 nth = (struct tcphdr *)(uh + 1);
1758 bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
1759 ip = mtod(m, struct ip *);
1760 nth = (struct tcphdr *)(ip + 1);
1762 /* Insert a UDP header */
1763 uh = (struct udphdr *)nth;
1764 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1765 uh->uh_dport = port;
1766 nth = (struct tcphdr *)(uh + 1);
1769 bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
1771 } else if ((!M_WRITABLE(m)) || (port != 0)) {
1774 /* Can't reuse 'm', allocate a new mbuf. */
1775 n = m_gethdr(M_NOWAIT, MT_DATA);
1781 if (!m_dup_pkthdr(n, m, M_NOWAIT)) {
1787 n->m_data += max_linkhdr;
1788 /* m_len is set later */
1789 #define xchg(a,b,type) { type t; t=a; a=b; b=t; }
1792 bcopy((caddr_t)ip6, mtod(n, caddr_t),
1793 sizeof(struct ip6_hdr));
1794 ip6 = mtod(n, struct ip6_hdr *);
1795 xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
1796 nth = (struct tcphdr *)(ip6 + 1);
1798 /* Insert a UDP header */
1799 uh = (struct udphdr *)nth;
1800 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1801 uh->uh_dport = port;
1802 nth = (struct tcphdr *)(uh + 1);
1807 bcopy((caddr_t)ip, mtod(n, caddr_t), sizeof(struct ip));
1808 ip = mtod(n, struct ip *);
1809 xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t);
1810 nth = (struct tcphdr *)(ip + 1);
1812 /* Insert a UDP header */
1813 uh = (struct udphdr *)nth;
1814 uh->uh_sport = htons(V_tcp_udp_tunneling_port);
1815 uh->uh_dport = port;
1816 nth = (struct tcphdr *)(uh + 1);
1819 bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
1820 xchg(nth->th_dport, nth->th_sport, uint16_t);
1827 * XXX MRT We inherit the FIB, which is lucky.
1831 m->m_data = (caddr_t)ipgen;
1832 /* m_len is set later */
1835 xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
1836 nth = (struct tcphdr *)(ip6 + 1);
1840 xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t);
1841 nth = (struct tcphdr *)(ip + 1);
1845 * this is usually a case when an extension header
1846 * exists between the IPv6 header and the
1849 nth->th_sport = th->th_sport;
1850 nth->th_dport = th->th_dport;
1852 xchg(nth->th_dport, nth->th_sport, uint16_t);
1858 tlen = sizeof (struct ip6_hdr) + sizeof (struct tcphdr);
1860 #if defined(INET) && defined(INET6)
1864 tlen = sizeof (struct tcpiphdr);
1867 tlen += sizeof (struct udphdr);
1870 KASSERT(M_TRAILINGSPACE(m) >= tlen,
1871 ("Not enough trailing space for message (m=%p, need=%d, have=%ld)",
1872 m, tlen, (long)M_TRAILINGSPACE(m)));
1877 /* Make sure we have room. */
1878 if (M_TRAILINGSPACE(m) < TCP_MAXOLEN) {
1879 m->m_next = m_get(M_NOWAIT, MT_DATA);
1881 optp = mtod(m->m_next, u_char *);
1886 optp = (u_char *) (nth + 1);
1892 if (tp->t_flags & TF_RCVD_TSTMP) {
1893 to.to_tsval = tcp_ts_getticks() + tp->ts_offset;
1894 to.to_tsecr = tp->ts_recent;
1895 to.to_flags |= TOF_TS;
1897 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
1898 /* TCP-MD5 (RFC2385). */
1899 if (tp->t_flags & TF_SIGNATURE)
1900 to.to_flags |= TOF_SIGNATURE;
1902 /* Add the options. */
1903 tlen += optlen = tcp_addoptions(&to, optp);
1905 /* Update m_len in the correct mbuf. */
1906 optm->m_len += optlen;
1912 ulen = tlen - sizeof(struct ip6_hdr);
1913 uh->uh_ulen = htons(ulen);
1916 ip6->ip6_vfc = IPV6_VERSION;
1918 ip6->ip6_nxt = IPPROTO_UDP;
1920 ip6->ip6_nxt = IPPROTO_TCP;
1921 ip6->ip6_plen = htons(tlen - sizeof(*ip6));
1924 #if defined(INET) && defined(INET6)
1930 ulen = tlen - sizeof(struct ip);
1931 uh->uh_ulen = htons(ulen);
1933 ip->ip_len = htons(tlen);
1934 ip->ip_ttl = V_ip_defttl;
1936 ip->ip_p = IPPROTO_UDP;
1938 ip->ip_p = IPPROTO_TCP;
1940 if (V_path_mtu_discovery)
1941 ip->ip_off |= htons(IP_DF);
1944 m->m_pkthdr.len = tlen;
1945 m->m_pkthdr.rcvif = NULL;
1949 * Packet is associated with a socket, so allow the
1950 * label of the response to reflect the socket label.
1952 INP_LOCK_ASSERT(inp);
1953 mac_inpcb_create_mbuf(inp, m);
1956 * Packet is not associated with a socket, so possibly
1957 * update the label in place.
1959 mac_netinet_tcp_reply(m);
1962 nth->th_seq = htonl(seq);
1963 nth->th_ack = htonl(ack);
1965 nth->th_off = (sizeof (struct tcphdr) + optlen) >> 2;
1966 nth->th_flags = flags;
1968 nth->th_win = htons((u_short) (win >> tp->rcv_scale));
1970 nth->th_win = htons((u_short)win);
1973 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
1974 if (to.to_flags & TOF_SIGNATURE) {
1975 if (!TCPMD5_ENABLED() ||
1976 TCPMD5_OUTPUT(m, nth, to.to_signature) != 0) {
1986 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6;
1987 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
1988 uh->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0);
1991 m->m_pkthdr.csum_flags = CSUM_TCP_IPV6;
1992 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
1993 nth->th_sum = in6_cksum_pseudo(ip6,
1994 tlen - sizeof(struct ip6_hdr), IPPROTO_TCP, 0);
1996 ip6->ip6_hlim = in6_selecthlim(tp != NULL ? tp->t_inpcb :
2000 #if defined(INET6) && defined(INET)
2006 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
2007 htons(ulen + IPPROTO_UDP));
2008 m->m_pkthdr.csum_flags = CSUM_UDP;
2009 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum);
2012 m->m_pkthdr.csum_flags = CSUM_TCP;
2013 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
2014 nth->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
2015 htons((u_short)(tlen - sizeof(struct ip) + ip->ip_p)));
2020 if (tp == NULL || (inp->inp_socket->so_options & SO_DEBUG))
2021 tcp_trace(TA_OUTPUT, 0, tp, mtod(m, void *), th, 0);
2023 TCP_PROBE3(debug__output, tp, th, m);
2025 TCP_PROBE5(accept__refused, NULL, NULL, m, tp, nth);
2029 TCP_PROBE5(send, NULL, tp, ip6, tp, nth);
2030 (void)ip6_output(m, NULL, NULL, 0, NULL, NULL, inp);
2033 #if defined(INET) && defined(INET6)
2038 TCP_PROBE5(send, NULL, tp, ip, tp, nth);
2039 (void)ip_output(m, NULL, NULL, 0, NULL, inp);
2045 * Create a new TCP control block, making an
2046 * empty reassembly queue and hooking it to the argument
2047 * protocol control block. The `inp' parameter must have
2048 * come from the zone allocator set up in tcp_init().
2051 tcp_newtcpcb(struct inpcb *inp)
2053 struct tcpcb_mem *tm;
2056 int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
2059 tm = uma_zalloc(V_tcpcb_zone, M_NOWAIT | M_ZERO);
2064 /* Initialise cc_var struct for this tcpcb. */
2066 tp->ccv->type = IPPROTO_TCP;
2067 tp->ccv->ccvc.tcp = tp;
2068 rw_rlock(&tcp_function_lock);
2069 tp->t_fb = tcp_func_set_ptr;
2070 refcount_acquire(&tp->t_fb->tfb_refcnt);
2071 rw_runlock(&tcp_function_lock);
2073 * Use the current system default CC algorithm.
2076 KASSERT(!STAILQ_EMPTY(&cc_list), ("cc_list is empty!"));
2077 CC_ALGO(tp) = CC_DEFAULT();
2080 * The tcpcb will hold a reference on its inpcb until tcp_discardcb()
2083 in_pcbref(inp); /* Reference for tcpcb */
2086 if (CC_ALGO(tp)->cb_init != NULL)
2087 if (CC_ALGO(tp)->cb_init(tp->ccv) > 0) {
2088 if (tp->t_fb->tfb_tcp_fb_fini)
2089 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
2090 in_pcbrele_wlocked(inp);
2091 refcount_release(&tp->t_fb->tfb_refcnt);
2092 uma_zfree(V_tcpcb_zone, tm);
2098 if (khelp_init_osd(HELPER_CLASS_TCP, tp->osd)) {
2099 if (tp->t_fb->tfb_tcp_fb_fini)
2100 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
2101 in_pcbrele_wlocked(inp);
2102 refcount_release(&tp->t_fb->tfb_refcnt);
2103 uma_zfree(V_tcpcb_zone, tm);
2109 tp->t_vnet = inp->inp_vnet;
2111 tp->t_timers = &tm->tt;
2112 TAILQ_INIT(&tp->t_segq);
2115 isipv6 ? V_tcp_v6mssdflt :
2119 /* Set up our timeouts. */
2120 callout_init(&tp->t_timers->tt_rexmt, 1);
2121 callout_init(&tp->t_timers->tt_persist, 1);
2122 callout_init(&tp->t_timers->tt_keep, 1);
2123 callout_init(&tp->t_timers->tt_2msl, 1);
2124 callout_init(&tp->t_timers->tt_delack, 1);
2126 if (V_tcp_do_rfc1323)
2127 tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP);
2129 tp->t_flags |= TF_SACK_PERMIT;
2130 TAILQ_INIT(&tp->snd_holes);
2133 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
2134 * rtt estimate. Set rttvar so that srtt + 4 * rttvar gives
2135 * reasonable initial retransmit time.
2137 tp->t_srtt = TCPTV_SRTTBASE;
2138 tp->t_rttvar = ((tcp_rexmit_initial - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4;
2139 tp->t_rttmin = tcp_rexmit_min;
2140 tp->t_rxtcur = tcp_rexmit_initial;
2141 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
2142 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
2143 tp->t_rcvtime = ticks;
2145 * IPv4 TTL initialization is necessary for an IPv6 socket as well,
2146 * because the socket may be bound to an IPv6 wildcard address,
2147 * which may match an IPv4-mapped IPv6 address.
2149 inp->inp_ip_ttl = V_ip_defttl;
2153 * Init the TCP PCAP queues.
2155 tcp_pcap_tcpcb_init(tp);
2158 /* Initialize the per-TCPCB log data. */
2159 tcp_log_tcpcbinit(tp);
2161 tp->t_pacing_rate = -1;
2162 if (tp->t_fb->tfb_tcp_fb_init) {
2163 if ((*tp->t_fb->tfb_tcp_fb_init)(tp)) {
2164 refcount_release(&tp->t_fb->tfb_refcnt);
2165 in_pcbrele_wlocked(inp);
2166 uma_zfree(V_tcpcb_zone, tm);
2171 if (V_tcp_perconn_stats_enable == 1)
2172 tp->t_stats = stats_blob_alloc(V_tcp_perconn_stats_dflt_tpl, 0);
2175 tp->t_flags |= TF_LRD;
2176 return (tp); /* XXX */
2180 * Switch the congestion control algorithm back to NewReno for any active
2181 * control blocks using an algorithm which is about to go away.
2182 * This ensures the CC framework can allow the unload to proceed without leaving
2183 * any dangling pointers which would trigger a panic.
2184 * Returning non-zero would inform the CC framework that something went wrong
2185 * and it would be unsafe to allow the unload to proceed. However, there is no
2186 * way for this to occur with this implementation so we always return zero.
2189 tcp_ccalgounload(struct cc_algo *unload_algo)
2191 struct cc_algo *tmpalgo;
2194 VNET_ITERATOR_DECL(vnet_iter);
2197 * Check all active control blocks across all network stacks and change
2198 * any that are using "unload_algo" back to NewReno. If "unload_algo"
2199 * requires cleanup code to be run, call it.
2202 VNET_FOREACH(vnet_iter) {
2203 CURVNET_SET(vnet_iter);
2204 INP_INFO_WLOCK(&V_tcbinfo);
2206 * New connections already part way through being initialised
2207 * with the CC algo we're removing will not race with this code
2208 * because the INP_INFO_WLOCK is held during initialisation. We
2209 * therefore don't enter the loop below until the connection
2210 * list has stabilised.
2212 CK_LIST_FOREACH(inp, &V_tcb, inp_list) {
2214 /* Important to skip tcptw structs. */
2215 if (!(inp->inp_flags & INP_TIMEWAIT) &&
2216 (tp = intotcpcb(inp)) != NULL) {
2218 * By holding INP_WLOCK here, we are assured
2219 * that the connection is not currently
2220 * executing inside the CC module's functions
2221 * i.e. it is safe to make the switch back to
2224 if (CC_ALGO(tp) == unload_algo) {
2225 tmpalgo = CC_ALGO(tp);
2226 if (tmpalgo->cb_destroy != NULL)
2227 tmpalgo->cb_destroy(tp->ccv);
2230 * NewReno may allocate memory on
2231 * demand for certain stateful
2232 * configuration as needed, but is
2233 * coded to never fail on memory
2234 * allocation failure so it is a safe
2237 CC_ALGO(tp) = &newreno_cc_algo;
2242 INP_INFO_WUNLOCK(&V_tcbinfo);
2245 VNET_LIST_RUNLOCK();
2251 * Drop a TCP connection, reporting
2252 * the specified error. If connection is synchronized,
2253 * then send a RST to peer.
2256 tcp_drop(struct tcpcb *tp, int errno)
2258 struct socket *so = tp->t_inpcb->inp_socket;
2261 INP_INFO_LOCK_ASSERT(&V_tcbinfo);
2262 INP_WLOCK_ASSERT(tp->t_inpcb);
2264 if (TCPS_HAVERCVDSYN(tp->t_state)) {
2265 tcp_state_change(tp, TCPS_CLOSED);
2266 (void) tp->t_fb->tfb_tcp_output(tp);
2267 TCPSTAT_INC(tcps_drops);
2269 TCPSTAT_INC(tcps_conndrops);
2270 if (errno == ETIMEDOUT && tp->t_softerror)
2271 errno = tp->t_softerror;
2272 so->so_error = errno;
2273 return (tcp_close(tp));
2277 tcp_discardcb(struct tcpcb *tp)
2279 struct inpcb *inp = tp->t_inpcb;
2280 struct socket *so = inp->inp_socket;
2282 int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
2284 int released __unused;
2286 INP_WLOCK_ASSERT(inp);
2289 * Make sure that all of our timers are stopped before we delete the
2292 * If stopping a timer fails, we schedule a discard function in same
2293 * callout, and the last discard function called will take care of
2294 * deleting the tcpcb.
2296 tp->t_timers->tt_draincnt = 0;
2297 tcp_timer_stop(tp, TT_REXMT);
2298 tcp_timer_stop(tp, TT_PERSIST);
2299 tcp_timer_stop(tp, TT_KEEP);
2300 tcp_timer_stop(tp, TT_2MSL);
2301 tcp_timer_stop(tp, TT_DELACK);
2302 if (tp->t_fb->tfb_tcp_timer_stop_all) {
2304 * Call the stop-all function of the methods,
2305 * this function should call the tcp_timer_stop()
2306 * method with each of the function specific timeouts.
2307 * That stop will be called via the tfb_tcp_timer_stop()
2308 * which should use the async drain function of the
2309 * callout system (see tcp_var.h).
2311 tp->t_fb->tfb_tcp_timer_stop_all(tp);
2314 /* free the reassembly queue, if any */
2315 tcp_reass_flush(tp);
2318 /* Disconnect offload device, if any. */
2319 if (tp->t_flags & TF_TOE)
2320 tcp_offload_detach(tp);
2323 tcp_free_sackholes(tp);
2326 /* Free the TCP PCAP queues. */
2327 tcp_pcap_drain(&(tp->t_inpkts));
2328 tcp_pcap_drain(&(tp->t_outpkts));
2331 /* Allow the CC algorithm to clean up after itself. */
2332 if (CC_ALGO(tp)->cb_destroy != NULL)
2333 CC_ALGO(tp)->cb_destroy(tp->ccv);
2337 khelp_destroy_osd(tp->osd);
2340 stats_blob_destroy(tp->t_stats);
2344 inp->inp_ppcb = NULL;
2345 if (tp->t_timers->tt_draincnt == 0) {
2346 /* We own the last reference on tcpcb, let's free it. */
2348 tcp_log_tcpcbfini(tp);
2350 TCPSTATES_DEC(tp->t_state);
2351 if (tp->t_fb->tfb_tcp_fb_fini)
2352 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
2355 * If we got enough samples through the srtt filter,
2356 * save the rtt and rttvar in the routing entry.
2357 * 'Enough' is arbitrarily defined as 4 rtt samples.
2358 * 4 samples is enough for the srtt filter to converge
2359 * to within enough % of the correct value; fewer samples
2360 * and we could save a bogus rtt. The danger is not high
2361 * as tcp quickly recovers from everything.
2362 * XXX: Works very well but needs some more statistics!
2364 * XXXRRS: Updating must be after the stack fini() since
2365 * that may be converting some internal representation of
2366 * say srtt etc into the general one used by other stacks.
2367 * Lets also at least protect against the so being NULL
2368 * as RW stated below.
2370 if ((tp->t_rttupdated >= 4) && (so != NULL)) {
2371 struct hc_metrics_lite metrics;
2374 bzero(&metrics, sizeof(metrics));
2376 * Update the ssthresh always when the conditions below
2377 * are satisfied. This gives us better new start value
2378 * for the congestion avoidance for new connections.
2379 * ssthresh is only set if packet loss occurred on a session.
2381 * XXXRW: 'so' may be NULL here, and/or socket buffer may be
2382 * being torn down. Ideally this code would not use 'so'.
2384 ssthresh = tp->snd_ssthresh;
2385 if (ssthresh != 0 && ssthresh < so->so_snd.sb_hiwat / 2) {
2387 * convert the limit from user data bytes to
2388 * packets then to packet data bytes.
2390 ssthresh = (ssthresh + tp->t_maxseg / 2) / tp->t_maxseg;
2393 ssthresh *= (tp->t_maxseg +
2395 (isipv6 ? sizeof (struct ip6_hdr) +
2396 sizeof (struct tcphdr) :
2398 sizeof (struct tcpiphdr)
2405 metrics.rmx_ssthresh = ssthresh;
2407 metrics.rmx_rtt = tp->t_srtt;
2408 metrics.rmx_rttvar = tp->t_rttvar;
2409 metrics.rmx_cwnd = tp->snd_cwnd;
2410 metrics.rmx_sendpipe = 0;
2411 metrics.rmx_recvpipe = 0;
2413 tcp_hc_update(&inp->inp_inc, &metrics);
2415 refcount_release(&tp->t_fb->tfb_refcnt);
2417 uma_zfree(V_tcpcb_zone, tp);
2418 released = in_pcbrele_wlocked(inp);
2419 KASSERT(!released, ("%s: inp %p should not have been released "
2420 "here", __func__, inp));
2425 tcp_timer_discard(void *ptp)
2429 struct epoch_tracker et;
2431 tp = (struct tcpcb *)ptp;
2432 CURVNET_SET(tp->t_vnet);
2433 NET_EPOCH_ENTER(et);
2435 KASSERT(inp != NULL, ("%s: tp %p tp->t_inpcb == NULL",
2438 KASSERT((tp->t_timers->tt_flags & TT_STOPPED) != 0,
2439 ("%s: tcpcb has to be stopped here", __func__));
2440 tp->t_timers->tt_draincnt--;
2441 if (tp->t_timers->tt_draincnt == 0) {
2442 /* We own the last reference on this tcpcb, let's free it. */
2444 tcp_log_tcpcbfini(tp);
2446 TCPSTATES_DEC(tp->t_state);
2447 if (tp->t_fb->tfb_tcp_fb_fini)
2448 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1);
2449 refcount_release(&tp->t_fb->tfb_refcnt);
2451 uma_zfree(V_tcpcb_zone, tp);
2452 if (in_pcbrele_wlocked(inp)) {
2464 * Attempt to close a TCP control block, marking it as dropped, and freeing
2465 * the socket if we hold the only reference.
2468 tcp_close(struct tcpcb *tp)
2470 struct inpcb *inp = tp->t_inpcb;
2473 INP_INFO_LOCK_ASSERT(&V_tcbinfo);
2474 INP_WLOCK_ASSERT(inp);
2477 if (tp->t_state == TCPS_LISTEN)
2478 tcp_offload_listen_stop(tp);
2481 * This releases the TFO pending counter resource for TFO listen
2482 * sockets as well as passively-created TFO sockets that transition
2483 * from SYN_RECEIVED to CLOSED.
2485 if (tp->t_tfo_pending) {
2486 tcp_fastopen_decrement_counter(tp->t_tfo_pending);
2487 tp->t_tfo_pending = NULL;
2490 TCPSTAT_INC(tcps_closed);
2491 if (tp->t_state != TCPS_CLOSED)
2492 tcp_state_change(tp, TCPS_CLOSED);
2493 KASSERT(inp->inp_socket != NULL, ("tcp_close: inp_socket NULL"));
2494 so = inp->inp_socket;
2495 soisdisconnected(so);
2496 if (inp->inp_flags & INP_SOCKREF) {
2497 KASSERT(so->so_state & SS_PROTOREF,
2498 ("tcp_close: !SS_PROTOREF"));
2499 inp->inp_flags &= ~INP_SOCKREF;
2502 so->so_state &= ~SS_PROTOREF;
2512 VNET_ITERATOR_DECL(vnet_iter);
2517 VNET_LIST_RLOCK_NOSLEEP();
2518 VNET_FOREACH(vnet_iter) {
2519 CURVNET_SET(vnet_iter);
2524 * Walk the tcpbs, if existing, and flush the reassembly queue,
2525 * if there is one...
2526 * XXX: The "Net/3" implementation doesn't imply that the TCP
2527 * reassembly queue should be flushed, but in a situation
2528 * where we're really low on mbufs, this is potentially
2531 INP_INFO_WLOCK(&V_tcbinfo);
2532 CK_LIST_FOREACH(inpb, V_tcbinfo.ipi_listhead, inp_list) {
2534 if (inpb->inp_flags & INP_TIMEWAIT) {
2538 if ((tcpb = intotcpcb(inpb)) != NULL) {
2539 tcp_reass_flush(tcpb);
2540 tcp_clean_sackreport(tcpb);
2542 tcp_log_drain(tcpb);
2545 if (tcp_pcap_aggressive_free) {
2546 /* Free the TCP PCAP queues. */
2547 tcp_pcap_drain(&(tcpb->t_inpkts));
2548 tcp_pcap_drain(&(tcpb->t_outpkts));
2554 INP_INFO_WUNLOCK(&V_tcbinfo);
2557 VNET_LIST_RUNLOCK_NOSLEEP();
2561 * Notify a tcp user of an asynchronous error;
2562 * store error as soft error, but wake up user
2563 * (for now, won't do anything until can select for soft error).
2565 * Do not wake up user since there currently is no mechanism for
2566 * reporting soft errors (yet - a kqueue filter may be added).
2568 static struct inpcb *
2569 tcp_notify(struct inpcb *inp, int error)
2573 INP_INFO_LOCK_ASSERT(&V_tcbinfo);
2574 INP_WLOCK_ASSERT(inp);
2576 if ((inp->inp_flags & INP_TIMEWAIT) ||
2577 (inp->inp_flags & INP_DROPPED))
2580 tp = intotcpcb(inp);
2581 KASSERT(tp != NULL, ("tcp_notify: tp == NULL"));
2584 * Ignore some errors if we are hooked up.
2585 * If connection hasn't completed, has retransmitted several times,
2586 * and receives a second error, give up now. This is better
2587 * than waiting a long time to establish a connection that
2588 * can never complete.
2590 if (tp->t_state == TCPS_ESTABLISHED &&
2591 (error == EHOSTUNREACH || error == ENETUNREACH ||
2592 error == EHOSTDOWN)) {
2593 if (inp->inp_route.ro_nh) {
2594 NH_FREE(inp->inp_route.ro_nh);
2595 inp->inp_route.ro_nh = (struct nhop_object *)NULL;
2598 } else if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift > 3 &&
2600 tp = tcp_drop(tp, error);
2606 tp->t_softerror = error;
2610 wakeup( &so->so_timeo);
2617 tcp_pcblist(SYSCTL_HANDLER_ARGS)
2619 struct epoch_tracker et;
2624 if (req->newptr != NULL)
2627 if (req->oldptr == NULL) {
2630 n = V_tcbinfo.ipi_count +
2631 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
2632 n += imax(n / 8, 10);
2633 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xtcpcb);
2637 if ((error = sysctl_wire_old_buffer(req, 0)) != 0)
2640 bzero(&xig, sizeof(xig));
2641 xig.xig_len = sizeof xig;
2642 xig.xig_count = V_tcbinfo.ipi_count +
2643 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
2644 xig.xig_gen = V_tcbinfo.ipi_gencnt;
2645 xig.xig_sogen = so_gencnt;
2646 error = SYSCTL_OUT(req, &xig, sizeof xig);
2650 error = syncache_pcblist(req);
2654 NET_EPOCH_ENTER(et);
2655 for (inp = CK_LIST_FIRST(V_tcbinfo.ipi_listhead);
2657 inp = CK_LIST_NEXT(inp, inp_list)) {
2659 if (inp->inp_gencnt <= xig.xig_gen) {
2663 * XXX: This use of cr_cansee(), introduced with
2664 * TCP state changes, is not quite right, but for
2665 * now, better than nothing.
2667 if (inp->inp_flags & INP_TIMEWAIT) {
2668 if (intotw(inp) != NULL)
2669 crerr = cr_cansee(req->td->td_ucred,
2670 intotw(inp)->tw_cred);
2672 crerr = EINVAL; /* Skip this inp. */
2674 crerr = cr_canseeinpcb(req->td->td_ucred, inp);
2678 tcp_inptoxtp(inp, &xt);
2680 error = SYSCTL_OUT(req, &xt, sizeof xt);
2693 * Give the user an updated idea of our state.
2694 * If the generation differs from what we told
2695 * her before, she knows that something happened
2696 * while we were processing this request, and it
2697 * might be necessary to retry.
2699 xig.xig_gen = V_tcbinfo.ipi_gencnt;
2700 xig.xig_sogen = so_gencnt;
2701 xig.xig_count = V_tcbinfo.ipi_count +
2702 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]);
2703 error = SYSCTL_OUT(req, &xig, sizeof xig);
2709 SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist,
2710 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT,
2711 NULL, 0, tcp_pcblist, "S,xtcpcb",
2712 "List of active TCP connections");
2716 tcp_getcred(SYSCTL_HANDLER_ARGS)
2719 struct sockaddr_in addrs[2];
2720 struct epoch_tracker et;
2724 error = priv_check(req->td, PRIV_NETINET_GETCRED);
2727 error = SYSCTL_IN(req, addrs, sizeof(addrs));
2730 NET_EPOCH_ENTER(et);
2731 inp = in_pcblookup(&V_tcbinfo, addrs[1].sin_addr, addrs[1].sin_port,
2732 addrs[0].sin_addr, addrs[0].sin_port, INPLOOKUP_RLOCKPCB, NULL);
2735 if (inp->inp_socket == NULL)
2738 error = cr_canseeinpcb(req->td->td_ucred, inp);
2740 cru2x(inp->inp_cred, &xuc);
2745 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
2749 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, getcred,
2750 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NEEDGIANT,
2751 0, 0, tcp_getcred, "S,xucred",
2752 "Get the xucred of a TCP connection");
2757 tcp6_getcred(SYSCTL_HANDLER_ARGS)
2759 struct epoch_tracker et;
2761 struct sockaddr_in6 addrs[2];
2768 error = priv_check(req->td, PRIV_NETINET_GETCRED);
2771 error = SYSCTL_IN(req, addrs, sizeof(addrs));
2774 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 ||
2775 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) {
2778 if (IN6_IS_ADDR_V4MAPPED(&addrs[0].sin6_addr)) {
2780 if (IN6_IS_ADDR_V4MAPPED(&addrs[1].sin6_addr))
2787 NET_EPOCH_ENTER(et);
2790 inp = in_pcblookup(&V_tcbinfo,
2791 *(struct in_addr *)&addrs[1].sin6_addr.s6_addr[12],
2793 *(struct in_addr *)&addrs[0].sin6_addr.s6_addr[12],
2794 addrs[0].sin6_port, INPLOOKUP_RLOCKPCB, NULL);
2797 inp = in6_pcblookup(&V_tcbinfo,
2798 &addrs[1].sin6_addr, addrs[1].sin6_port,
2799 &addrs[0].sin6_addr, addrs[0].sin6_port,
2800 INPLOOKUP_RLOCKPCB, NULL);
2803 if (inp->inp_socket == NULL)
2806 error = cr_canseeinpcb(req->td->td_ucred, inp);
2808 cru2x(inp->inp_cred, &xuc);
2813 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred));
2817 SYSCTL_PROC(_net_inet6_tcp6, OID_AUTO, getcred,
2818 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NEEDGIANT,
2819 0, 0, tcp6_getcred, "S,xucred",
2820 "Get the xucred of a TCP6 connection");
2824 /* Path MTU to try next when a fragmentation-needed message is received. */
2826 tcp_next_pmtu(const struct icmp *icp, const struct ip *ip)
2828 int mtu = ntohs(icp->icmp_nextmtu);
2830 /* If no alternative MTU was proposed, try the next smaller one. */
2832 mtu = ip_next_mtu(ntohs(ip->ip_len), 1);
2833 if (mtu < V_tcp_minmss + sizeof(struct tcpiphdr))
2834 mtu = V_tcp_minmss + sizeof(struct tcpiphdr);
2840 tcp_ctlinput_with_port(int cmd, struct sockaddr *sa, void *vip, uint16_t port)
2842 struct ip *ip = vip;
2844 struct in_addr faddr;
2847 struct inpcb *(*notify)(struct inpcb *, int) = tcp_notify;
2849 struct in_conninfo inc;
2850 tcp_seq icmp_tcp_seq;
2853 faddr = ((struct sockaddr_in *)sa)->sin_addr;
2854 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
2857 if (cmd == PRC_MSGSIZE)
2858 notify = tcp_mtudisc_notify;
2859 else if (V_icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB ||
2860 cmd == PRC_UNREACH_PORT || cmd == PRC_UNREACH_PROTOCOL ||
2861 cmd == PRC_TIMXCEED_INTRANS) && ip)
2862 notify = tcp_drop_syn_sent;
2865 * Hostdead is ugly because it goes linearly through all PCBs.
2866 * XXX: We never get this from ICMP, otherwise it makes an
2867 * excellent DoS attack on machines with many connections.
2869 else if (cmd == PRC_HOSTDEAD)
2871 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0)
2875 in_pcbnotifyall(&V_tcbinfo, faddr, inetctlerrmap[cmd], notify);
2879 icp = (struct icmp *)((caddr_t)ip - offsetof(struct icmp, icmp_ip));
2880 th = (struct tcphdr *)((caddr_t)ip + (ip->ip_hl << 2));
2881 inp = in_pcblookup(&V_tcbinfo, faddr, th->th_dport, ip->ip_src,
2882 th->th_sport, INPLOOKUP_WLOCKPCB, NULL);
2883 if (inp != NULL && PRC_IS_REDIRECT(cmd)) {
2884 /* signal EHOSTDOWN, as it flushes the cached route */
2885 inp = (*notify)(inp, EHOSTDOWN);
2888 icmp_tcp_seq = th->th_seq;
2890 if (!(inp->inp_flags & INP_TIMEWAIT) &&
2891 !(inp->inp_flags & INP_DROPPED) &&
2892 !(inp->inp_socket == NULL)) {
2893 tp = intotcpcb(inp);
2895 if (tp->t_flags & TF_TOE && cmd == PRC_MSGSIZE) {
2897 * MTU discovery for offloaded connections. Let
2898 * the TOE driver verify seq# and process it.
2900 mtu = tcp_next_pmtu(icp, ip);
2901 tcp_offload_pmtu_update(tp, icmp_tcp_seq, mtu);
2905 if (tp->t_port != port) {
2908 if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) &&
2909 SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) {
2910 if (cmd == PRC_MSGSIZE) {
2912 * MTU discovery: we got a needfrag and
2913 * will potentially try a lower MTU.
2915 mtu = tcp_next_pmtu(icp, ip);
2918 * Only process the offered MTU if it
2919 * is smaller than the current one.
2921 if (mtu < tp->t_maxseg +
2922 sizeof(struct tcpiphdr)) {
2923 bzero(&inc, sizeof(inc));
2924 inc.inc_faddr = faddr;
2926 inp->inp_inc.inc_fibnum;
2927 tcp_hc_updatemtu(&inc, mtu);
2928 tcp_mtudisc(inp, mtu);
2931 inp = (*notify)(inp,
2932 inetctlerrmap[cmd]);
2936 bzero(&inc, sizeof(inc));
2937 inc.inc_fport = th->th_dport;
2938 inc.inc_lport = th->th_sport;
2939 inc.inc_faddr = faddr;
2940 inc.inc_laddr = ip->ip_src;
2941 syncache_unreach(&inc, icmp_tcp_seq, port);
2949 tcp_ctlinput(int cmd, struct sockaddr *sa, void *vip)
2951 tcp_ctlinput_with_port(cmd, sa, vip, htons(0));
2955 tcp_ctlinput_viaudp(int cmd, struct sockaddr *sa, void *vip, void *unused)
2957 /* Its a tunneled TCP over UDP icmp */
2958 struct ip *outer_ip, *inner_ip;
2961 struct tcphdr *th, ttemp;
2965 inner_ip = (struct ip *)vip;
2966 icmp = (struct icmp *)((caddr_t)inner_ip -
2967 (sizeof(struct icmp) - sizeof(struct ip)));
2968 outer_ip = (struct ip *)((caddr_t)icmp - sizeof(struct ip));
2969 i_hlen = inner_ip->ip_hl << 2;
2970 o_len = ntohs(outer_ip->ip_len);
2972 (sizeof(struct ip) + 8 + i_hlen + sizeof(struct udphdr) + offsetof(struct tcphdr, th_ack))) {
2973 /* Not enough data present */
2976 /* Ok lets strip out the inner udphdr header by copying up on top of it the tcp hdr */
2977 udp = (struct udphdr *)(((caddr_t)inner_ip) + i_hlen);
2978 if (ntohs(udp->uh_sport) != V_tcp_udp_tunneling_port) {
2981 port = udp->uh_dport;
2982 th = (struct tcphdr *)(udp + 1);
2983 memcpy(&ttemp, th, sizeof(struct tcphdr));
2984 memcpy(udp, &ttemp, sizeof(struct tcphdr));
2985 /* Now adjust down the size of the outer IP header */
2986 o_len -= sizeof(struct udphdr);
2987 outer_ip->ip_len = htons(o_len);
2988 /* Now call in to the normal handling code */
2989 tcp_ctlinput_with_port(cmd, sa, vip, port);
2995 tcp6_next_pmtu(const struct icmp6_hdr *icmp6)
2997 int mtu = ntohl(icmp6->icmp6_mtu);
3000 * If no alternative MTU was proposed, or the proposed MTU was too
3001 * small, set to the min.
3003 if (mtu < IPV6_MMTU)
3004 mtu = IPV6_MMTU - 8; /* XXXNP: what is the adjustment for? */
3009 tcp6_ctlinput_with_port(int cmd, struct sockaddr *sa, void *d, uint16_t port)
3011 struct in6_addr *dst;
3012 struct inpcb *(*notify)(struct inpcb *, int) = tcp_notify;
3013 struct ip6_hdr *ip6;
3017 struct icmp6_hdr *icmp6;
3018 struct ip6ctlparam *ip6cp = NULL;
3019 const struct sockaddr_in6 *sa6_src = NULL;
3020 struct in_conninfo inc;
3025 tcp_seq icmp_tcp_seq;
3029 if (sa->sa_family != AF_INET6 ||
3030 sa->sa_len != sizeof(struct sockaddr_in6))
3033 /* if the parameter is from icmp6, decode it. */
3035 ip6cp = (struct ip6ctlparam *)d;
3036 icmp6 = ip6cp->ip6c_icmp6;
3038 ip6 = ip6cp->ip6c_ip6;
3039 off = ip6cp->ip6c_off;
3040 sa6_src = ip6cp->ip6c_src;
3041 dst = ip6cp->ip6c_finaldst;
3045 off = 0; /* fool gcc */
3050 if (cmd == PRC_MSGSIZE)
3051 notify = tcp_mtudisc_notify;
3052 else if (V_icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB ||
3053 cmd == PRC_UNREACH_PORT || cmd == PRC_UNREACH_PROTOCOL ||
3054 cmd == PRC_TIMXCEED_INTRANS) && ip6 != NULL)
3055 notify = tcp_drop_syn_sent;
3058 * Hostdead is ugly because it goes linearly through all PCBs.
3059 * XXX: We never get this from ICMP, otherwise it makes an
3060 * excellent DoS attack on machines with many connections.
3062 else if (cmd == PRC_HOSTDEAD)
3064 else if ((unsigned)cmd >= PRC_NCMDS || inet6ctlerrmap[cmd] == 0)
3068 in6_pcbnotify(&V_tcbinfo, sa, 0,
3069 (const struct sockaddr *)sa6_src,
3070 0, cmd, NULL, notify);
3074 /* Check if we can safely get the ports from the tcp hdr */
3077 (int32_t) (off + sizeof(struct tcp_ports)))) {
3080 bzero(&t_ports, sizeof(struct tcp_ports));
3081 m_copydata(m, off, sizeof(struct tcp_ports), (caddr_t)&t_ports);
3082 inp = in6_pcblookup(&V_tcbinfo, &ip6->ip6_dst, t_ports.th_dport,
3083 &ip6->ip6_src, t_ports.th_sport, INPLOOKUP_WLOCKPCB, NULL);
3084 if (inp != NULL && PRC_IS_REDIRECT(cmd)) {
3085 /* signal EHOSTDOWN, as it flushes the cached route */
3086 inp = (*notify)(inp, EHOSTDOWN);
3089 off += sizeof(struct tcp_ports);
3090 if (m->m_pkthdr.len < (int32_t) (off + sizeof(tcp_seq))) {
3093 m_copydata(m, off, sizeof(tcp_seq), (caddr_t)&icmp_tcp_seq);
3095 if (!(inp->inp_flags & INP_TIMEWAIT) &&
3096 !(inp->inp_flags & INP_DROPPED) &&
3097 !(inp->inp_socket == NULL)) {
3098 tp = intotcpcb(inp);
3100 if (tp->t_flags & TF_TOE && cmd == PRC_MSGSIZE) {
3101 /* MTU discovery for offloaded connections. */
3102 mtu = tcp6_next_pmtu(icmp6);
3103 tcp_offload_pmtu_update(tp, icmp_tcp_seq, mtu);
3107 if (tp->t_port != port) {
3110 if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) &&
3111 SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) {
3112 if (cmd == PRC_MSGSIZE) {
3115 * If we got a needfrag set the MTU
3116 * in the route to the suggested new
3117 * value (if given) and then notify.
3119 mtu = tcp6_next_pmtu(icmp6);
3121 bzero(&inc, sizeof(inc));
3122 inc.inc_fibnum = M_GETFIB(m);
3123 inc.inc_flags |= INC_ISIPV6;
3124 inc.inc6_faddr = *dst;
3125 if (in6_setscope(&inc.inc6_faddr,
3126 m->m_pkthdr.rcvif, NULL))
3129 * Only process the offered MTU if it
3130 * is smaller than the current one.
3132 if (mtu < tp->t_maxseg +
3133 sizeof (struct tcphdr) +
3134 sizeof (struct ip6_hdr)) {
3135 tcp_hc_updatemtu(&inc, mtu);
3136 tcp_mtudisc(inp, mtu);
3137 ICMP6STAT_INC(icp6s_pmtuchg);
3140 inp = (*notify)(inp,
3141 inet6ctlerrmap[cmd]);
3145 bzero(&inc, sizeof(inc));
3146 inc.inc_fibnum = M_GETFIB(m);
3147 inc.inc_flags |= INC_ISIPV6;
3148 inc.inc_fport = t_ports.th_dport;
3149 inc.inc_lport = t_ports.th_sport;
3150 inc.inc6_faddr = *dst;
3151 inc.inc6_laddr = ip6->ip6_src;
3152 syncache_unreach(&inc, icmp_tcp_seq, port);
3160 tcp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
3162 tcp6_ctlinput_with_port(cmd, sa, d, htons(0));
3166 tcp6_ctlinput_viaudp(int cmd, struct sockaddr *sa, void *d, void *unused)
3168 struct ip6ctlparam *ip6cp;
3173 ip6cp = (struct ip6ctlparam *)d;
3174 m = m_pulldown(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(struct udphdr), NULL);
3178 udp = mtod(m, struct udphdr *);
3179 if (ntohs(udp->uh_sport) != V_tcp_udp_tunneling_port) {
3182 port = udp->uh_dport;
3183 m_adj(m, sizeof(struct udphdr));
3184 if ((m->m_flags & M_PKTHDR) == 0) {
3185 ip6cp->ip6c_m->m_pkthdr.len -= sizeof(struct udphdr);
3187 /* Now call in to the normal handling code */
3188 tcp6_ctlinput_with_port(cmd, sa, d, port);
3194 tcp_keyed_hash(struct in_conninfo *inc, u_char *key, u_int len)
3199 KASSERT(len >= SIPHASH_KEY_LENGTH,
3200 ("%s: keylen %u too short ", __func__, len));
3201 SipHash24_Init(&ctx);
3202 SipHash_SetKey(&ctx, (uint8_t *)key);
3203 SipHash_Update(&ctx, &inc->inc_fport, sizeof(uint16_t));
3204 SipHash_Update(&ctx, &inc->inc_lport, sizeof(uint16_t));
3205 switch (inc->inc_flags & INC_ISIPV6) {
3208 SipHash_Update(&ctx, &inc->inc_faddr, sizeof(struct in_addr));
3209 SipHash_Update(&ctx, &inc->inc_laddr, sizeof(struct in_addr));
3214 SipHash_Update(&ctx, &inc->inc6_faddr, sizeof(struct in6_addr));
3215 SipHash_Update(&ctx, &inc->inc6_laddr, sizeof(struct in6_addr));
3219 SipHash_Final((uint8_t *)hash, &ctx);
3221 return (hash[0] ^ hash[1]);
3225 tcp_new_ts_offset(struct in_conninfo *inc)
3227 struct in_conninfo inc_store, *local_inc;
3229 if (!V_tcp_ts_offset_per_conn) {
3230 memcpy(&inc_store, inc, sizeof(struct in_conninfo));
3231 inc_store.inc_lport = 0;
3232 inc_store.inc_fport = 0;
3233 local_inc = &inc_store;
3237 return (tcp_keyed_hash(local_inc, V_ts_offset_secret,
3238 sizeof(V_ts_offset_secret)));
3242 * Following is where TCP initial sequence number generation occurs.
3244 * There are two places where we must use initial sequence numbers:
3245 * 1. In SYN-ACK packets.
3246 * 2. In SYN packets.
3248 * All ISNs for SYN-ACK packets are generated by the syncache. See
3249 * tcp_syncache.c for details.
3251 * The ISNs in SYN packets must be monotonic; TIME_WAIT recycling
3252 * depends on this property. In addition, these ISNs should be
3253 * unguessable so as to prevent connection hijacking. To satisfy
3254 * the requirements of this situation, the algorithm outlined in
3255 * RFC 1948 is used, with only small modifications.
3257 * Implementation details:
3259 * Time is based off the system timer, and is corrected so that it
3260 * increases by one megabyte per second. This allows for proper
3261 * recycling on high speed LANs while still leaving over an hour
3264 * As reading the *exact* system time is too expensive to be done
3265 * whenever setting up a TCP connection, we increment the time
3266 * offset in two ways. First, a small random positive increment
3267 * is added to isn_offset for each connection that is set up.
3268 * Second, the function tcp_isn_tick fires once per clock tick
3269 * and increments isn_offset as necessary so that sequence numbers
3270 * are incremented at approximately ISN_BYTES_PER_SECOND. The
3271 * random positive increments serve only to ensure that the same
3272 * exact sequence number is never sent out twice (as could otherwise
3273 * happen when a port is recycled in less than the system tick
3276 * net.inet.tcp.isn_reseed_interval controls the number of seconds
3277 * between seeding of isn_secret. This is normally set to zero,
3278 * as reseeding should not be necessary.
3280 * Locking of the global variables isn_secret, isn_last_reseed, isn_offset,
3281 * isn_offset_old, and isn_ctx is performed using the ISN lock. In
3282 * general, this means holding an exclusive (write) lock.
3285 #define ISN_BYTES_PER_SECOND 1048576
3286 #define ISN_STATIC_INCREMENT 4096
3287 #define ISN_RANDOM_INCREMENT (4096 - 1)
3288 #define ISN_SECRET_LENGTH SIPHASH_KEY_LENGTH
3290 VNET_DEFINE_STATIC(u_char, isn_secret[ISN_SECRET_LENGTH]);
3291 VNET_DEFINE_STATIC(int, isn_last);
3292 VNET_DEFINE_STATIC(int, isn_last_reseed);
3293 VNET_DEFINE_STATIC(u_int32_t, isn_offset);
3294 VNET_DEFINE_STATIC(u_int32_t, isn_offset_old);
3296 #define V_isn_secret VNET(isn_secret)
3297 #define V_isn_last VNET(isn_last)
3298 #define V_isn_last_reseed VNET(isn_last_reseed)
3299 #define V_isn_offset VNET(isn_offset)
3300 #define V_isn_offset_old VNET(isn_offset_old)
3303 tcp_new_isn(struct in_conninfo *inc)
3306 u_int32_t projected_offset;
3309 /* Seed if this is the first use, reseed if requested. */
3310 if ((V_isn_last_reseed == 0) || ((V_tcp_isn_reseed_interval > 0) &&
3311 (((u_int)V_isn_last_reseed + (u_int)V_tcp_isn_reseed_interval*hz)
3313 arc4rand(&V_isn_secret, sizeof(V_isn_secret), 0);
3314 V_isn_last_reseed = ticks;
3317 /* Compute the hash and return the ISN. */
3318 new_isn = (tcp_seq)tcp_keyed_hash(inc, V_isn_secret,
3319 sizeof(V_isn_secret));
3320 V_isn_offset += ISN_STATIC_INCREMENT +
3321 (arc4random() & ISN_RANDOM_INCREMENT);
3322 if (ticks != V_isn_last) {
3323 projected_offset = V_isn_offset_old +
3324 ISN_BYTES_PER_SECOND / hz * (ticks - V_isn_last);
3325 if (SEQ_GT(projected_offset, V_isn_offset))
3326 V_isn_offset = projected_offset;
3327 V_isn_offset_old = V_isn_offset;
3330 new_isn += V_isn_offset;
3336 * When a specific ICMP unreachable message is received and the
3337 * connection state is SYN-SENT, drop the connection. This behavior
3338 * is controlled by the icmp_may_rst sysctl.
3341 tcp_drop_syn_sent(struct inpcb *inp, int errno)
3346 INP_WLOCK_ASSERT(inp);
3348 if ((inp->inp_flags & INP_TIMEWAIT) ||
3349 (inp->inp_flags & INP_DROPPED))
3352 tp = intotcpcb(inp);
3353 if (tp->t_state != TCPS_SYN_SENT)
3356 if (IS_FASTOPEN(tp->t_flags))
3357 tcp_fastopen_disable_path(tp);
3359 tp = tcp_drop(tp, errno);
3367 * When `need fragmentation' ICMP is received, update our idea of the MSS
3368 * based on the new value. Also nudge TCP to send something, since we
3369 * know the packet we just sent was dropped.
3370 * This duplicates some code in the tcp_mss() function in tcp_input.c.
3372 static struct inpcb *
3373 tcp_mtudisc_notify(struct inpcb *inp, int error)
3376 tcp_mtudisc(inp, -1);
3381 tcp_mtudisc(struct inpcb *inp, int mtuoffer)
3386 INP_WLOCK_ASSERT(inp);
3387 if ((inp->inp_flags & INP_TIMEWAIT) ||
3388 (inp->inp_flags & INP_DROPPED))
3391 tp = intotcpcb(inp);
3392 KASSERT(tp != NULL, ("tcp_mtudisc: tp == NULL"));
3394 tcp_mss_update(tp, -1, mtuoffer, NULL, NULL);
3396 so = inp->inp_socket;
3397 SOCKBUF_LOCK(&so->so_snd);
3398 /* If the mss is larger than the socket buffer, decrease the mss. */
3399 if (so->so_snd.sb_hiwat < tp->t_maxseg)
3400 tp->t_maxseg = so->so_snd.sb_hiwat;
3401 SOCKBUF_UNLOCK(&so->so_snd);
3403 TCPSTAT_INC(tcps_mturesent);
3405 tp->snd_nxt = tp->snd_una;
3406 tcp_free_sackholes(tp);
3407 tp->snd_recover = tp->snd_max;
3408 if (tp->t_flags & TF_SACK_PERMIT)
3409 EXIT_FASTRECOVERY(tp->t_flags);
3410 if (tp->t_fb->tfb_tcp_mtu_chg != NULL) {
3412 * Conceptually the snd_nxt setting
3413 * and freeing sack holes should
3414 * be done by the default stacks
3415 * own tfb_tcp_mtu_chg().
3417 tp->t_fb->tfb_tcp_mtu_chg(tp);
3419 tp->t_fb->tfb_tcp_output(tp);
3424 * Look-up the routing entry to the peer of this inpcb. If no route
3425 * is found and it cannot be allocated, then return 0. This routine
3426 * is called by TCP routines that access the rmx structure and by
3427 * tcp_mss_update to get the peer/interface MTU.
3430 tcp_maxmtu(struct in_conninfo *inc, struct tcp_ifcap *cap)
3432 struct nhop_object *nh;
3434 uint32_t maxmtu = 0;
3436 KASSERT(inc != NULL, ("tcp_maxmtu with NULL in_conninfo pointer"));
3438 if (inc->inc_faddr.s_addr != INADDR_ANY) {
3439 nh = fib4_lookup(inc->inc_fibnum, inc->inc_faddr, 0, NHR_NONE, 0);
3444 maxmtu = nh->nh_mtu;
3446 /* Report additional interface capabilities. */
3448 if (ifp->if_capenable & IFCAP_TSO4 &&
3449 ifp->if_hwassist & CSUM_TSO) {
3450 cap->ifcap |= CSUM_TSO;
3451 cap->tsomax = ifp->if_hw_tsomax;
3452 cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
3453 cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
3463 tcp_maxmtu6(struct in_conninfo *inc, struct tcp_ifcap *cap)
3465 struct nhop_object *nh;
3466 struct in6_addr dst6;
3469 uint32_t maxmtu = 0;
3471 KASSERT(inc != NULL, ("tcp_maxmtu6 with NULL in_conninfo pointer"));
3473 if (inc->inc_flags & INC_IPV6MINMTU)
3476 if (!IN6_IS_ADDR_UNSPECIFIED(&inc->inc6_faddr)) {
3477 in6_splitscope(&inc->inc6_faddr, &dst6, &scopeid);
3478 nh = fib6_lookup(inc->inc_fibnum, &dst6, scopeid, NHR_NONE, 0);
3483 maxmtu = nh->nh_mtu;
3485 /* Report additional interface capabilities. */
3487 if (ifp->if_capenable & IFCAP_TSO6 &&
3488 ifp->if_hwassist & CSUM_TSO) {
3489 cap->ifcap |= CSUM_TSO;
3490 cap->tsomax = ifp->if_hw_tsomax;
3491 cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount;
3492 cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize;
3502 * Calculate effective SMSS per RFC5681 definition for a given TCP
3503 * connection at its current state, taking into account SACK and etc.
3506 tcp_maxseg(const struct tcpcb *tp)
3510 if (tp->t_flags & TF_NOOPT)
3511 return (tp->t_maxseg);
3514 * Here we have a simplified code from tcp_addoptions(),
3515 * without a proper loop, and having most of paddings hardcoded.
3516 * We might make mistakes with padding here in some edge cases,
3517 * but this is harmless, since result of tcp_maxseg() is used
3518 * only in cwnd and ssthresh estimations.
3520 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
3521 if (tp->t_flags & TF_RCVD_TSTMP)
3522 optlen = TCPOLEN_TSTAMP_APPA;
3525 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3526 if (tp->t_flags & TF_SIGNATURE)
3527 optlen += PADTCPOLEN(TCPOLEN_SIGNATURE);
3529 if ((tp->t_flags & TF_SACK_PERMIT) && tp->rcv_numsacks > 0) {
3530 optlen += TCPOLEN_SACKHDR;
3531 optlen += tp->rcv_numsacks * TCPOLEN_SACK;
3532 optlen = PADTCPOLEN(optlen);
3535 if (tp->t_flags & TF_REQ_TSTMP)
3536 optlen = TCPOLEN_TSTAMP_APPA;
3538 optlen = PADTCPOLEN(TCPOLEN_MAXSEG);
3539 if (tp->t_flags & TF_REQ_SCALE)
3540 optlen += PADTCPOLEN(TCPOLEN_WINDOW);
3541 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3542 if (tp->t_flags & TF_SIGNATURE)
3543 optlen += PADTCPOLEN(TCPOLEN_SIGNATURE);
3545 if (tp->t_flags & TF_SACK_PERMIT)
3546 optlen += PADTCPOLEN(TCPOLEN_SACK_PERMITTED);
3549 optlen = min(optlen, TCP_MAXOLEN);
3550 return (tp->t_maxseg - optlen);
3555 tcp_fixed_maxseg(const struct tcpcb *tp)
3559 if (tp->t_flags & TF_NOOPT)
3560 return (tp->t_maxseg);
3563 * Here we have a simplified code from tcp_addoptions(),
3564 * without a proper loop, and having most of paddings hardcoded.
3565 * We only consider fixed options that we would send every
3566 * time I.e. SACK is not considered. This is important
3567 * for cc modules to figure out what the modulo of the
3570 #define PAD(len) ((((len) / 4) + !!((len) % 4)) * 4)
3571 if (TCPS_HAVEESTABLISHED(tp->t_state)) {
3572 if (tp->t_flags & TF_RCVD_TSTMP)
3573 optlen = TCPOLEN_TSTAMP_APPA;
3576 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3577 if (tp->t_flags & TF_SIGNATURE)
3578 optlen += PAD(TCPOLEN_SIGNATURE);
3581 if (tp->t_flags & TF_REQ_TSTMP)
3582 optlen = TCPOLEN_TSTAMP_APPA;
3584 optlen = PAD(TCPOLEN_MAXSEG);
3585 if (tp->t_flags & TF_REQ_SCALE)
3586 optlen += PAD(TCPOLEN_WINDOW);
3587 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE)
3588 if (tp->t_flags & TF_SIGNATURE)
3589 optlen += PAD(TCPOLEN_SIGNATURE);
3591 if (tp->t_flags & TF_SACK_PERMIT)
3592 optlen += PAD(TCPOLEN_SACK_PERMITTED);
3595 optlen = min(optlen, TCP_MAXOLEN);
3596 return (tp->t_maxseg - optlen);
3602 sysctl_drop(SYSCTL_HANDLER_ARGS)
3604 /* addrs[0] is a foreign socket, addrs[1] is a local one. */
3605 struct sockaddr_storage addrs[2];
3609 struct sockaddr_in *fin, *lin;
3610 struct epoch_tracker et;
3612 struct sockaddr_in6 *fin6, *lin6;
3623 if (req->oldptr != NULL || req->oldlen != 0)
3625 if (req->newptr == NULL)
3627 if (req->newlen < sizeof(addrs))
3629 error = SYSCTL_IN(req, &addrs, sizeof(addrs));
3633 switch (addrs[0].ss_family) {
3636 fin6 = (struct sockaddr_in6 *)&addrs[0];
3637 lin6 = (struct sockaddr_in6 *)&addrs[1];
3638 if (fin6->sin6_len != sizeof(struct sockaddr_in6) ||
3639 lin6->sin6_len != sizeof(struct sockaddr_in6))
3641 if (IN6_IS_ADDR_V4MAPPED(&fin6->sin6_addr)) {
3642 if (!IN6_IS_ADDR_V4MAPPED(&lin6->sin6_addr))
3644 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[0]);
3645 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[1]);
3646 fin = (struct sockaddr_in *)&addrs[0];
3647 lin = (struct sockaddr_in *)&addrs[1];
3650 error = sa6_embedscope(fin6, V_ip6_use_defzone);
3653 error = sa6_embedscope(lin6, V_ip6_use_defzone);
3660 fin = (struct sockaddr_in *)&addrs[0];
3661 lin = (struct sockaddr_in *)&addrs[1];
3662 if (fin->sin_len != sizeof(struct sockaddr_in) ||
3663 lin->sin_len != sizeof(struct sockaddr_in))
3670 NET_EPOCH_ENTER(et);
3671 switch (addrs[0].ss_family) {
3674 inp = in6_pcblookup(&V_tcbinfo, &fin6->sin6_addr,
3675 fin6->sin6_port, &lin6->sin6_addr, lin6->sin6_port,
3676 INPLOOKUP_WLOCKPCB, NULL);
3681 inp = in_pcblookup(&V_tcbinfo, fin->sin_addr, fin->sin_port,
3682 lin->sin_addr, lin->sin_port, INPLOOKUP_WLOCKPCB, NULL);
3687 if (inp->inp_flags & INP_TIMEWAIT) {
3689 * XXXRW: There currently exists a state where an
3690 * inpcb is present, but its timewait state has been
3691 * discarded. For now, don't allow dropping of this
3699 } else if (!(inp->inp_flags & INP_DROPPED) &&
3700 !(inp->inp_socket->so_options & SO_ACCEPTCONN)) {
3701 tp = intotcpcb(inp);
3702 tp = tcp_drop(tp, ECONNABORTED);
3713 SYSCTL_PROC(_net_inet_tcp, TCPCTL_DROP, drop,
3714 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
3715 CTLFLAG_NEEDGIANT, NULL, 0, sysctl_drop, "",
3716 "Drop TCP connection");
3720 sysctl_switch_tls(SYSCTL_HANDLER_ARGS)
3722 /* addrs[0] is a foreign socket, addrs[1] is a local one. */
3723 struct sockaddr_storage addrs[2];
3725 struct sockaddr_in *fin, *lin;
3726 struct epoch_tracker et;
3728 struct sockaddr_in6 *fin6, *lin6;
3739 if (req->oldptr != NULL || req->oldlen != 0)
3741 if (req->newptr == NULL)
3743 if (req->newlen < sizeof(addrs))
3745 error = SYSCTL_IN(req, &addrs, sizeof(addrs));
3749 switch (addrs[0].ss_family) {
3752 fin6 = (struct sockaddr_in6 *)&addrs[0];
3753 lin6 = (struct sockaddr_in6 *)&addrs[1];
3754 if (fin6->sin6_len != sizeof(struct sockaddr_in6) ||
3755 lin6->sin6_len != sizeof(struct sockaddr_in6))
3757 if (IN6_IS_ADDR_V4MAPPED(&fin6->sin6_addr)) {
3758 if (!IN6_IS_ADDR_V4MAPPED(&lin6->sin6_addr))
3760 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[0]);
3761 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[1]);
3762 fin = (struct sockaddr_in *)&addrs[0];
3763 lin = (struct sockaddr_in *)&addrs[1];
3766 error = sa6_embedscope(fin6, V_ip6_use_defzone);
3769 error = sa6_embedscope(lin6, V_ip6_use_defzone);
3776 fin = (struct sockaddr_in *)&addrs[0];
3777 lin = (struct sockaddr_in *)&addrs[1];
3778 if (fin->sin_len != sizeof(struct sockaddr_in) ||
3779 lin->sin_len != sizeof(struct sockaddr_in))
3786 NET_EPOCH_ENTER(et);
3787 switch (addrs[0].ss_family) {
3790 inp = in6_pcblookup(&V_tcbinfo, &fin6->sin6_addr,
3791 fin6->sin6_port, &lin6->sin6_addr, lin6->sin6_port,
3792 INPLOOKUP_WLOCKPCB, NULL);
3797 inp = in_pcblookup(&V_tcbinfo, fin->sin_addr, fin->sin_port,
3798 lin->sin_addr, lin->sin_port, INPLOOKUP_WLOCKPCB, NULL);
3804 if ((inp->inp_flags & (INP_TIMEWAIT | INP_DROPPED)) != 0 ||
3805 inp->inp_socket == NULL) {
3811 so = inp->inp_socket;
3813 error = ktls_set_tx_mode(so,
3814 arg2 == 0 ? TCP_TLS_MODE_SW : TCP_TLS_MODE_IFNET);
3824 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, switch_to_sw_tls,
3825 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
3826 CTLFLAG_NEEDGIANT, NULL, 0, sysctl_switch_tls, "",
3827 "Switch TCP connection to SW TLS");
3828 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, switch_to_ifnet_tls,
3829 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP |
3830 CTLFLAG_NEEDGIANT, NULL, 1, sysctl_switch_tls, "",
3831 "Switch TCP connection to ifnet TLS");
3835 * Generate a standardized TCP log line for use throughout the
3836 * tcp subsystem. Memory allocation is done with M_NOWAIT to
3837 * allow use in the interrupt context.
3839 * NB: The caller MUST free(s, M_TCPLOG) the returned string.
3840 * NB: The function may return NULL if memory allocation failed.
3842 * Due to header inclusion and ordering limitations the struct ip
3843 * and ip6_hdr pointers have to be passed as void pointers.
3846 tcp_log_vain(struct in_conninfo *inc, struct tcphdr *th, void *ip4hdr,
3850 /* Is logging enabled? */
3851 if (V_tcp_log_in_vain == 0)
3854 return (tcp_log_addr(inc, th, ip4hdr, ip6hdr));
3858 tcp_log_addrs(struct in_conninfo *inc, struct tcphdr *th, void *ip4hdr,
3862 /* Is logging enabled? */
3863 if (tcp_log_debug == 0)
3866 return (tcp_log_addr(inc, th, ip4hdr, ip6hdr));
3870 tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th, void *ip4hdr,
3877 const struct ip6_hdr *ip6;
3879 ip6 = (const struct ip6_hdr *)ip6hdr;
3881 ip = (struct ip *)ip4hdr;
3884 * The log line looks like this:
3885 * "TCP: [1.2.3.4]:50332 to [1.2.3.4]:80 tcpflags 0x2<SYN>"
3887 size = sizeof("TCP: []:12345 to []:12345 tcpflags 0x2<>") +
3888 sizeof(PRINT_TH_FLAGS) + 1 +
3890 2 * INET6_ADDRSTRLEN;
3892 2 * INET_ADDRSTRLEN;
3895 s = malloc(size, M_TCPLOG, M_ZERO|M_NOWAIT);
3899 strcat(s, "TCP: [");
3902 if (inc && ((inc->inc_flags & INC_ISIPV6) == 0)) {
3903 inet_ntoa_r(inc->inc_faddr, sp);
3905 sprintf(sp, "]:%i to [", ntohs(inc->inc_fport));
3907 inet_ntoa_r(inc->inc_laddr, sp);
3909 sprintf(sp, "]:%i", ntohs(inc->inc_lport));
3912 ip6_sprintf(sp, &inc->inc6_faddr);
3914 sprintf(sp, "]:%i to [", ntohs(inc->inc_fport));
3916 ip6_sprintf(sp, &inc->inc6_laddr);
3918 sprintf(sp, "]:%i", ntohs(inc->inc_lport));
3919 } else if (ip6 && th) {
3920 ip6_sprintf(sp, &ip6->ip6_src);
3922 sprintf(sp, "]:%i to [", ntohs(th->th_sport));
3924 ip6_sprintf(sp, &ip6->ip6_dst);
3926 sprintf(sp, "]:%i", ntohs(th->th_dport));
3929 } else if (ip && th) {
3930 inet_ntoa_r(ip->ip_src, sp);
3932 sprintf(sp, "]:%i to [", ntohs(th->th_sport));
3934 inet_ntoa_r(ip->ip_dst, sp);
3936 sprintf(sp, "]:%i", ntohs(th->th_dport));
3944 sprintf(sp, " tcpflags 0x%b", th->th_flags, PRINT_TH_FLAGS);
3945 if (*(s + size - 1) != '\0')
3946 panic("%s: string too long", __func__);
3951 * A subroutine which makes it easy to track TCP state changes with DTrace.
3952 * This function shouldn't be called for t_state initializations that don't
3953 * correspond to actual TCP state transitions.
3956 tcp_state_change(struct tcpcb *tp, int newstate)
3958 #if defined(KDTRACE_HOOKS)
3959 int pstate = tp->t_state;
3962 TCPSTATES_DEC(tp->t_state);
3963 TCPSTATES_INC(newstate);
3964 tp->t_state = newstate;
3965 TCP_PROBE6(state__change, NULL, tp, NULL, tp, NULL, pstate);
3969 * Create an external-format (``xtcpcb'') structure using the information in
3970 * the kernel-format tcpcb structure pointed to by tp. This is done to
3971 * reduce the spew of irrelevant information over this interface, to isolate
3972 * user code from changes in the kernel structure, and potentially to provide
3973 * information-hiding if we decide that some of this information should be
3974 * hidden from users.
3977 tcp_inptoxtp(const struct inpcb *inp, struct xtcpcb *xt)
3979 struct tcpcb *tp = intotcpcb(inp);
3980 struct tcptw *tw = intotw(inp);
3983 bzero(xt, sizeof(*xt));
3984 if (inp->inp_flags & INP_TIMEWAIT) {
3985 xt->t_state = TCPS_TIME_WAIT;
3986 xt->xt_encaps_port = tw->t_port;
3988 xt->t_state = tp->t_state;
3989 xt->t_logstate = tp->t_logstate;
3990 xt->t_flags = tp->t_flags;
3991 xt->t_sndzerowin = tp->t_sndzerowin;
3992 xt->t_sndrexmitpack = tp->t_sndrexmitpack;
3993 xt->t_rcvoopack = tp->t_rcvoopack;
3994 xt->t_rcv_wnd = tp->rcv_wnd;
3995 xt->t_snd_wnd = tp->snd_wnd;
3996 xt->t_snd_cwnd = tp->snd_cwnd;
3997 xt->t_snd_ssthresh = tp->snd_ssthresh;
3998 xt->t_maxseg = tp->t_maxseg;
3999 xt->xt_ecn = (tp->t_flags2 & TF2_ECN_PERMIT) ? 1 : 0 +
4000 (tp->t_flags2 & TF2_ACE_PERMIT) ? 2 : 0;
4002 now = getsbinuptime();
4003 #define COPYTIMER(ttt) do { \
4004 if (callout_active(&tp->t_timers->ttt)) \
4005 xt->ttt = (tp->t_timers->ttt.c_time - now) / \
4010 COPYTIMER(tt_delack);
4011 COPYTIMER(tt_rexmt);
4012 COPYTIMER(tt_persist);
4016 xt->t_rcvtime = 1000 * (ticks - tp->t_rcvtime) / hz;
4018 xt->xt_encaps_port = tp->t_port;
4019 bcopy(tp->t_fb->tfb_tcp_block_name, xt->xt_stack,
4020 TCP_FUNCTION_NAME_LEN_MAX);
4021 bcopy(CC_ALGO(tp)->name, xt->xt_cc,
4024 (void)tcp_log_get_id(tp, xt->xt_logid);
4028 xt->xt_len = sizeof(struct xtcpcb);
4029 in_pcbtoxinpcb(inp, &xt->xt_inp);
4030 if (inp->inp_socket == NULL)
4031 xt->xt_inp.xi_socket.xso_protocol = IPPROTO_TCP;
4035 tcp_log_end_status(struct tcpcb *tp, uint8_t status)
4040 (status > TCP_EI_STATUS_MAX_VALUE) ||
4045 if (status > (sizeof(uint32_t) * 8)) {
4046 /* Should this be a KASSERT? */
4049 bit = 1U << (status - 1);
4050 if (bit & tp->t_end_info_status) {
4051 /* already logged */
4054 for (i = 0; i < TCP_END_BYTE_INFO; i++) {
4055 if (tp->t_end_info_bytes[i] == TCP_EI_EMPTY_SLOT) {
4056 tp->t_end_info_bytes[i] = status;
4057 tp->t_end_info_status |= bit;
4064 tcp_can_enable_pacing(void)
4067 if ((tcp_pacing_limit == -1) ||
4068 (tcp_pacing_limit > number_of_tcp_connections_pacing)) {
4069 atomic_fetchadd_int(&number_of_tcp_connections_pacing, 1);
4070 shadow_num_connections = number_of_tcp_connections_pacing;
4077 static uint8_t tcp_pacing_warning = 0;
4080 tcp_decrement_paced_conn(void)
4084 ret = atomic_fetchadd_int(&number_of_tcp_connections_pacing, -1);
4085 shadow_num_connections = number_of_tcp_connections_pacing;
4086 KASSERT(ret != 0, ("tcp_paced_connection_exits -1 would cause wrap?"));
4088 if (tcp_pacing_limit != -1) {
4089 printf("Warning all pacing is now disabled, count decrements invalidly!\n");
4090 tcp_pacing_limit = 0;
4091 } else if (tcp_pacing_warning == 0) {
4092 printf("Warning pacing count is invalid, invalid decrement\n");
4093 tcp_pacing_warning = 1;