1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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. 18 * 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 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 #include "opt_ipsec.h" 36 #include "opt_kern_tls.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/arb.h> 41 #include <sys/callout.h> 42 #include <sys/eventhandler.h> 43 #ifdef TCP_HHOOK 44 #include <sys/hhook.h> 45 #endif 46 #include <sys/kernel.h> 47 #ifdef TCP_HHOOK 48 #include <sys/khelp.h> 49 #endif 50 #ifdef KERN_TLS 51 #include <sys/ktls.h> 52 #endif 53 #include <sys/qmath.h> 54 #include <sys/stats.h> 55 #include <sys/sysctl.h> 56 #include <sys/jail.h> 57 #include <sys/malloc.h> 58 #include <sys/refcount.h> 59 #include <sys/mbuf.h> 60 #include <sys/priv.h> 61 #include <sys/proc.h> 62 #include <sys/sdt.h> 63 #include <sys/socket.h> 64 #include <sys/socketvar.h> 65 #include <sys/protosw.h> 66 #include <sys/random.h> 67 68 #include <vm/uma.h> 69 70 #include <net/route.h> 71 #include <net/route/nhop.h> 72 #include <net/if.h> 73 #include <net/if_var.h> 74 #include <net/if_private.h> 75 #include <net/vnet.h> 76 77 #include <netinet/in.h> 78 #include <netinet/in_fib.h> 79 #include <netinet/in_kdtrace.h> 80 #include <netinet/in_pcb.h> 81 #include <netinet/in_systm.h> 82 #include <netinet/in_var.h> 83 #include <netinet/ip.h> 84 #include <netinet/ip_icmp.h> 85 #include <netinet/ip_var.h> 86 #ifdef INET6 87 #include <netinet/icmp6.h> 88 #include <netinet/ip6.h> 89 #include <netinet6/in6_fib.h> 90 #include <netinet6/in6_pcb.h> 91 #include <netinet6/ip6_var.h> 92 #include <netinet6/scope6_var.h> 93 #include <netinet6/nd6.h> 94 #endif 95 96 #include <netinet/tcp.h> 97 #ifdef INVARIANTS 98 #define TCPSTATES 99 #endif 100 #include <netinet/tcp_fsm.h> 101 #include <netinet/tcp_seq.h> 102 #include <netinet/tcp_timer.h> 103 #include <netinet/tcp_var.h> 104 #include <netinet/tcp_ecn.h> 105 #include <netinet/tcp_log_buf.h> 106 #include <netinet/tcp_syncache.h> 107 #include <netinet/tcp_hpts.h> 108 #include <netinet/tcp_lro.h> 109 #include <netinet/cc/cc.h> 110 #include <netinet/tcpip.h> 111 #include <netinet/tcp_fastopen.h> 112 #include <netinet/tcp_accounting.h> 113 #ifdef TCPPCAP 114 #include <netinet/tcp_pcap.h> 115 #endif 116 #ifdef TCP_OFFLOAD 117 #include <netinet/tcp_offload.h> 118 #endif 119 #include <netinet/udp.h> 120 #include <netinet/udp_var.h> 121 #ifdef INET6 122 #include <netinet6/tcp6_var.h> 123 #endif 124 125 #include <netipsec/ipsec_support.h> 126 127 #include <machine/in_cksum.h> 128 #include <crypto/siphash/siphash.h> 129 130 #include <security/mac/mac_framework.h> 131 132 #ifdef INET6 133 static ip6proto_ctlinput_t tcp6_ctlinput; 134 static udp_tun_icmp_t tcp6_ctlinput_viaudp; 135 #endif 136 137 VNET_DEFINE(int, tcp_mssdflt) = TCP_MSS; 138 #ifdef INET6 139 VNET_DEFINE(int, tcp_v6mssdflt) = TCP6_MSS; 140 #endif 141 142 #ifdef TCP_SAD_DETECTION 143 /* Sack attack detection thresholds and such */ 144 SYSCTL_NODE(_net_inet_tcp, OID_AUTO, sack_attack, 145 CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 146 "Sack Attack detection thresholds"); 147 int32_t tcp_force_detection = 0; 148 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, force_detection, 149 CTLFLAG_RW, 150 &tcp_force_detection, 0, 151 "Do we force detection even if the INP has it off?"); 152 int32_t tcp_sad_limit = 10000; 153 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, limit, 154 CTLFLAG_RW, 155 &tcp_sad_limit, 10000, 156 "If SaD is enabled, what is the limit to sendmap entries (0 = unlimited)?"); 157 int32_t tcp_sack_to_ack_thresh = 700; /* 70 % */ 158 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, sack_to_ack_thresh, 159 CTLFLAG_RW, 160 &tcp_sack_to_ack_thresh, 700, 161 "Percentage of sacks to acks we must see above (10.1 percent is 101)?"); 162 int32_t tcp_sack_to_move_thresh = 600; /* 60 % */ 163 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, move_thresh, 164 CTLFLAG_RW, 165 &tcp_sack_to_move_thresh, 600, 166 "Percentage of sack moves we must see above (10.1 percent is 101)"); 167 int32_t tcp_restoral_thresh = 450; /* 45 % (sack:2:ack -25%) (mv:ratio -15%) **/ 168 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, restore_thresh, 169 CTLFLAG_RW, 170 &tcp_restoral_thresh, 450, 171 "Percentage of sack to ack percentage we must see below to restore(10.1 percent is 101)"); 172 int32_t tcp_sad_decay_val = 800; 173 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, decay_per, 174 CTLFLAG_RW, 175 &tcp_sad_decay_val, 800, 176 "The decay percentage (10.1 percent equals 101 )"); 177 int32_t tcp_map_minimum = 500; 178 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, nummaps, 179 CTLFLAG_RW, 180 &tcp_map_minimum, 500, 181 "Number of Map enteries before we start detection"); 182 int32_t tcp_sad_pacing_interval = 2000; 183 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, sad_pacing_int, 184 CTLFLAG_RW, 185 &tcp_sad_pacing_interval, 2000, 186 "What is the minimum pacing interval for a classified attacker?"); 187 188 int32_t tcp_sad_low_pps = 100; 189 SYSCTL_INT(_net_inet_tcp_sack_attack, OID_AUTO, sad_low_pps, 190 CTLFLAG_RW, 191 &tcp_sad_low_pps, 100, 192 "What is the input pps that below which we do not decay?"); 193 #endif 194 uint32_t tcp_ack_war_time_window = 1000; 195 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, ack_war_timewindow, 196 CTLFLAG_RW, 197 &tcp_ack_war_time_window, 1000, 198 "If the tcp_stack does ack-war prevention how many milliseconds are in its time window?"); 199 uint32_t tcp_ack_war_cnt = 5; 200 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, ack_war_cnt, 201 CTLFLAG_RW, 202 &tcp_ack_war_cnt, 5, 203 "If the tcp_stack does ack-war prevention how many acks can be sent in its time window?"); 204 205 struct rwlock tcp_function_lock; 206 207 static int 208 sysctl_net_inet_tcp_mss_check(SYSCTL_HANDLER_ARGS) 209 { 210 int error, new; 211 212 new = V_tcp_mssdflt; 213 error = sysctl_handle_int(oidp, &new, 0, req); 214 if (error == 0 && req->newptr) { 215 if (new < TCP_MINMSS) 216 error = EINVAL; 217 else 218 V_tcp_mssdflt = new; 219 } 220 return (error); 221 } 222 223 SYSCTL_PROC(_net_inet_tcp, TCPCTL_MSSDFLT, mssdflt, 224 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 225 &VNET_NAME(tcp_mssdflt), 0, &sysctl_net_inet_tcp_mss_check, "I", 226 "Default TCP Maximum Segment Size"); 227 228 #ifdef INET6 229 static int 230 sysctl_net_inet_tcp_mss_v6_check(SYSCTL_HANDLER_ARGS) 231 { 232 int error, new; 233 234 new = V_tcp_v6mssdflt; 235 error = sysctl_handle_int(oidp, &new, 0, req); 236 if (error == 0 && req->newptr) { 237 if (new < TCP_MINMSS) 238 error = EINVAL; 239 else 240 V_tcp_v6mssdflt = new; 241 } 242 return (error); 243 } 244 245 SYSCTL_PROC(_net_inet_tcp, TCPCTL_V6MSSDFLT, v6mssdflt, 246 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 247 &VNET_NAME(tcp_v6mssdflt), 0, &sysctl_net_inet_tcp_mss_v6_check, "I", 248 "Default TCP Maximum Segment Size for IPv6"); 249 #endif /* INET6 */ 250 251 /* 252 * Minimum MSS we accept and use. This prevents DoS attacks where 253 * we are forced to a ridiculous low MSS like 20 and send hundreds 254 * of packets instead of one. The effect scales with the available 255 * bandwidth and quickly saturates the CPU and network interface 256 * with packet generation and sending. Set to zero to disable MINMSS 257 * checking. This setting prevents us from sending too small packets. 258 */ 259 VNET_DEFINE(int, tcp_minmss) = TCP_MINMSS; 260 SYSCTL_INT(_net_inet_tcp, OID_AUTO, minmss, CTLFLAG_VNET | CTLFLAG_RW, 261 &VNET_NAME(tcp_minmss), 0, 262 "Minimum TCP Maximum Segment Size"); 263 264 VNET_DEFINE(int, tcp_do_rfc1323) = 1; 265 SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, CTLFLAG_VNET | CTLFLAG_RW, 266 &VNET_NAME(tcp_do_rfc1323), 0, 267 "Enable rfc1323 (high performance TCP) extensions"); 268 269 /* 270 * As of June 2021, several TCP stacks violate RFC 7323 from September 2014. 271 * Some stacks negotiate TS, but never send them after connection setup. Some 272 * stacks negotiate TS, but don't send them when sending keep-alive segments. 273 * These include modern widely deployed TCP stacks. 274 * Therefore tolerating violations for now... 275 */ 276 VNET_DEFINE(int, tcp_tolerate_missing_ts) = 1; 277 SYSCTL_INT(_net_inet_tcp, OID_AUTO, tolerate_missing_ts, CTLFLAG_VNET | CTLFLAG_RW, 278 &VNET_NAME(tcp_tolerate_missing_ts), 0, 279 "Tolerate missing TCP timestamps"); 280 281 VNET_DEFINE(int, tcp_ts_offset_per_conn) = 1; 282 SYSCTL_INT(_net_inet_tcp, OID_AUTO, ts_offset_per_conn, CTLFLAG_VNET | CTLFLAG_RW, 283 &VNET_NAME(tcp_ts_offset_per_conn), 0, 284 "Initialize TCP timestamps per connection instead of per host pair"); 285 286 /* How many connections are pacing */ 287 static volatile uint32_t number_of_tcp_connections_pacing = 0; 288 static uint32_t shadow_num_connections = 0; 289 static counter_u64_t tcp_pacing_failures; 290 291 static int tcp_pacing_limit = 10000; 292 SYSCTL_INT(_net_inet_tcp, OID_AUTO, pacing_limit, CTLFLAG_RW, 293 &tcp_pacing_limit, 1000, 294 "If the TCP stack does pacing, is there a limit (-1 = no, 0 = no pacing N = number of connections)"); 295 296 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, pacing_count, CTLFLAG_RD, 297 &shadow_num_connections, 0, "Number of TCP connections being paced"); 298 299 SYSCTL_COUNTER_U64(_net_inet_tcp, OID_AUTO, pacing_failures, CTLFLAG_RD, 300 &tcp_pacing_failures, "Number of times we failed to enable pacing to avoid exceeding the limit"); 301 302 static int tcp_log_debug = 0; 303 SYSCTL_INT(_net_inet_tcp, OID_AUTO, log_debug, CTLFLAG_RW, 304 &tcp_log_debug, 0, "Log errors caused by incoming TCP segments"); 305 306 /* 307 * Target size of TCP PCB hash tables. Must be a power of two. 308 * 309 * Note that this can be overridden by the kernel environment 310 * variable net.inet.tcp.tcbhashsize 311 */ 312 #ifndef TCBHASHSIZE 313 #define TCBHASHSIZE 0 314 #endif 315 static int tcp_tcbhashsize = TCBHASHSIZE; 316 SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RDTUN, 317 &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable"); 318 319 static int do_tcpdrain = 1; 320 SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0, 321 "Enable tcp_drain routine for extra help when low on mbufs"); 322 323 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_VNET | CTLFLAG_RD, 324 &VNET_NAME(tcbinfo.ipi_count), 0, "Number of active PCBs"); 325 326 VNET_DEFINE_STATIC(int, icmp_may_rst) = 1; 327 #define V_icmp_may_rst VNET(icmp_may_rst) 328 SYSCTL_INT(_net_inet_tcp, OID_AUTO, icmp_may_rst, CTLFLAG_VNET | CTLFLAG_RW, 329 &VNET_NAME(icmp_may_rst), 0, 330 "Certain ICMP unreachable messages may abort connections in SYN_SENT"); 331 332 VNET_DEFINE_STATIC(int, tcp_isn_reseed_interval) = 0; 333 #define V_tcp_isn_reseed_interval VNET(tcp_isn_reseed_interval) 334 SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_VNET | CTLFLAG_RW, 335 &VNET_NAME(tcp_isn_reseed_interval), 0, 336 "Seconds between reseeding of ISN secret"); 337 338 static int tcp_soreceive_stream; 339 SYSCTL_INT(_net_inet_tcp, OID_AUTO, soreceive_stream, CTLFLAG_RDTUN, 340 &tcp_soreceive_stream, 0, "Using soreceive_stream for TCP sockets"); 341 342 VNET_DEFINE(uma_zone_t, sack_hole_zone); 343 #define V_sack_hole_zone VNET(sack_hole_zone) 344 VNET_DEFINE(uint32_t, tcp_map_entries_limit) = 0; /* unlimited */ 345 static int 346 sysctl_net_inet_tcp_map_limit_check(SYSCTL_HANDLER_ARGS) 347 { 348 int error; 349 uint32_t new; 350 351 new = V_tcp_map_entries_limit; 352 error = sysctl_handle_int(oidp, &new, 0, req); 353 if (error == 0 && req->newptr) { 354 /* only allow "0" and value > minimum */ 355 if (new > 0 && new < TCP_MIN_MAP_ENTRIES_LIMIT) 356 error = EINVAL; 357 else 358 V_tcp_map_entries_limit = new; 359 } 360 return (error); 361 } 362 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, map_limit, 363 CTLFLAG_VNET | CTLTYPE_UINT | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 364 &VNET_NAME(tcp_map_entries_limit), 0, 365 &sysctl_net_inet_tcp_map_limit_check, "IU", 366 "Total sendmap entries limit"); 367 368 VNET_DEFINE(uint32_t, tcp_map_split_limit) = 0; /* unlimited */ 369 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, split_limit, CTLFLAG_VNET | CTLFLAG_RW, 370 &VNET_NAME(tcp_map_split_limit), 0, 371 "Total sendmap split entries limit"); 372 373 #ifdef TCP_HHOOK 374 VNET_DEFINE(struct hhook_head *, tcp_hhh[HHOOK_TCP_LAST+1]); 375 #endif 376 377 #define TS_OFFSET_SECRET_LENGTH SIPHASH_KEY_LENGTH 378 VNET_DEFINE_STATIC(u_char, ts_offset_secret[TS_OFFSET_SECRET_LENGTH]); 379 #define V_ts_offset_secret VNET(ts_offset_secret) 380 381 static int tcp_default_fb_init(struct tcpcb *tp, void **ptr); 382 static void tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged); 383 static int tcp_default_handoff_ok(struct tcpcb *tp); 384 static struct inpcb *tcp_notify(struct inpcb *, int); 385 static struct inpcb *tcp_mtudisc_notify(struct inpcb *, int); 386 static struct inpcb *tcp_mtudisc(struct inpcb *, int); 387 static struct inpcb *tcp_drop_syn_sent(struct inpcb *, int); 388 static char * tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th, 389 const void *ip4hdr, const void *ip6hdr); 390 static void tcp_default_switch_failed(struct tcpcb *tp); 391 static ipproto_ctlinput_t tcp_ctlinput; 392 static udp_tun_icmp_t tcp_ctlinput_viaudp; 393 394 static struct tcp_function_block tcp_def_funcblk = { 395 .tfb_tcp_block_name = "freebsd", 396 .tfb_tcp_output = tcp_default_output, 397 .tfb_tcp_do_segment = tcp_do_segment, 398 .tfb_tcp_ctloutput = tcp_default_ctloutput, 399 .tfb_tcp_handoff_ok = tcp_default_handoff_ok, 400 .tfb_tcp_fb_init = tcp_default_fb_init, 401 .tfb_tcp_fb_fini = tcp_default_fb_fini, 402 .tfb_switch_failed = tcp_default_switch_failed, 403 }; 404 405 static int tcp_fb_cnt = 0; 406 struct tcp_funchead t_functions; 407 VNET_DEFINE_STATIC(struct tcp_function_block *, tcp_func_set_ptr) = &tcp_def_funcblk; 408 #define V_tcp_func_set_ptr VNET(tcp_func_set_ptr) 409 410 void 411 tcp_record_dsack(struct tcpcb *tp, tcp_seq start, tcp_seq end, int tlp) 412 { 413 TCPSTAT_INC(tcps_dsack_count); 414 tp->t_dsack_pack++; 415 if (tlp == 0) { 416 if (SEQ_GT(end, start)) { 417 tp->t_dsack_bytes += (end - start); 418 TCPSTAT_ADD(tcps_dsack_bytes, (end - start)); 419 } else { 420 tp->t_dsack_tlp_bytes += (start - end); 421 TCPSTAT_ADD(tcps_dsack_bytes, (start - end)); 422 } 423 } else { 424 if (SEQ_GT(end, start)) { 425 tp->t_dsack_bytes += (end - start); 426 TCPSTAT_ADD(tcps_dsack_tlp_bytes, (end - start)); 427 } else { 428 tp->t_dsack_tlp_bytes += (start - end); 429 TCPSTAT_ADD(tcps_dsack_tlp_bytes, (start - end)); 430 } 431 } 432 } 433 434 static struct tcp_function_block * 435 find_tcp_functions_locked(struct tcp_function_set *fs) 436 { 437 struct tcp_function *f; 438 struct tcp_function_block *blk=NULL; 439 440 TAILQ_FOREACH(f, &t_functions, tf_next) { 441 if (strcmp(f->tf_name, fs->function_set_name) == 0) { 442 blk = f->tf_fb; 443 break; 444 } 445 } 446 return(blk); 447 } 448 449 static struct tcp_function_block * 450 find_tcp_fb_locked(struct tcp_function_block *blk, struct tcp_function **s) 451 { 452 struct tcp_function_block *rblk=NULL; 453 struct tcp_function *f; 454 455 TAILQ_FOREACH(f, &t_functions, tf_next) { 456 if (f->tf_fb == blk) { 457 rblk = blk; 458 if (s) { 459 *s = f; 460 } 461 break; 462 } 463 } 464 return (rblk); 465 } 466 467 struct tcp_function_block * 468 find_and_ref_tcp_functions(struct tcp_function_set *fs) 469 { 470 struct tcp_function_block *blk; 471 472 rw_rlock(&tcp_function_lock); 473 blk = find_tcp_functions_locked(fs); 474 if (blk) 475 refcount_acquire(&blk->tfb_refcnt); 476 rw_runlock(&tcp_function_lock); 477 return(blk); 478 } 479 480 struct tcp_function_block * 481 find_and_ref_tcp_fb(struct tcp_function_block *blk) 482 { 483 struct tcp_function_block *rblk; 484 485 rw_rlock(&tcp_function_lock); 486 rblk = find_tcp_fb_locked(blk, NULL); 487 if (rblk) 488 refcount_acquire(&rblk->tfb_refcnt); 489 rw_runlock(&tcp_function_lock); 490 return(rblk); 491 } 492 493 /* Find a matching alias for the given tcp_function_block. */ 494 int 495 find_tcp_function_alias(struct tcp_function_block *blk, 496 struct tcp_function_set *fs) 497 { 498 struct tcp_function *f; 499 int found; 500 501 found = 0; 502 rw_rlock(&tcp_function_lock); 503 TAILQ_FOREACH(f, &t_functions, tf_next) { 504 if ((f->tf_fb == blk) && 505 (strncmp(f->tf_name, blk->tfb_tcp_block_name, 506 TCP_FUNCTION_NAME_LEN_MAX) != 0)) { 507 /* Matching function block with different name. */ 508 strncpy(fs->function_set_name, f->tf_name, 509 TCP_FUNCTION_NAME_LEN_MAX); 510 found = 1; 511 break; 512 } 513 } 514 /* Null terminate the string appropriately. */ 515 if (found) { 516 fs->function_set_name[TCP_FUNCTION_NAME_LEN_MAX - 1] = '\0'; 517 } else { 518 fs->function_set_name[0] = '\0'; 519 } 520 rw_runlock(&tcp_function_lock); 521 return (found); 522 } 523 524 static struct tcp_function_block * 525 find_and_ref_tcp_default_fb(void) 526 { 527 struct tcp_function_block *rblk; 528 529 rw_rlock(&tcp_function_lock); 530 rblk = V_tcp_func_set_ptr; 531 refcount_acquire(&rblk->tfb_refcnt); 532 rw_runlock(&tcp_function_lock); 533 return (rblk); 534 } 535 536 void 537 tcp_switch_back_to_default(struct tcpcb *tp) 538 { 539 struct tcp_function_block *tfb; 540 void *ptr = NULL; 541 542 KASSERT(tp->t_fb != &tcp_def_funcblk, 543 ("%s: called by the built-in default stack", __func__)); 544 545 /* 546 * Now, we'll find a new function block to use. 547 * Start by trying the current user-selected 548 * default, unless this stack is the user-selected 549 * default. 550 */ 551 tfb = find_and_ref_tcp_default_fb(); 552 if (tfb == tp->t_fb) { 553 refcount_release(&tfb->tfb_refcnt); 554 tfb = NULL; 555 } 556 /* Does the stack accept this connection? */ 557 if (tfb != NULL && tfb->tfb_tcp_handoff_ok != NULL && 558 (*tfb->tfb_tcp_handoff_ok)(tp)) { 559 refcount_release(&tfb->tfb_refcnt); 560 tfb = NULL; 561 } 562 /* Try to use that stack. */ 563 if (tfb != NULL) { 564 /* Initialize the new stack. If it succeeds, we are done. */ 565 if (tfb->tfb_tcp_fb_init == NULL || 566 (*tfb->tfb_tcp_fb_init)(tp, &ptr) == 0) { 567 /* Release the old stack */ 568 if (tp->t_fb->tfb_tcp_fb_fini != NULL) 569 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 570 refcount_release(&tp->t_fb->tfb_refcnt); 571 /* Now set in all the pointers */ 572 tp->t_fb = tfb; 573 tp->t_fb_ptr = ptr; 574 return; 575 } 576 /* 577 * Initialization failed. Release the reference count on 578 * the looked up default stack. 579 */ 580 refcount_release(&tfb->tfb_refcnt); 581 } 582 583 /* 584 * If that wasn't feasible, use the built-in default 585 * stack which is not allowed to reject anyone. 586 */ 587 tfb = find_and_ref_tcp_fb(&tcp_def_funcblk); 588 if (tfb == NULL) { 589 /* there always should be a default */ 590 panic("Can't refer to tcp_def_funcblk"); 591 } 592 if (tfb->tfb_tcp_handoff_ok != NULL) { 593 if ((*tfb->tfb_tcp_handoff_ok) (tp)) { 594 /* The default stack cannot say no */ 595 panic("Default stack rejects a new session?"); 596 } 597 } 598 if (tfb->tfb_tcp_fb_init != NULL && 599 (*tfb->tfb_tcp_fb_init)(tp, &ptr)) { 600 /* The default stack cannot fail */ 601 panic("Default stack initialization failed"); 602 } 603 /* Now release the old stack */ 604 if (tp->t_fb->tfb_tcp_fb_fini != NULL) 605 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 0); 606 refcount_release(&tp->t_fb->tfb_refcnt); 607 /* And set in the pointers to the new */ 608 tp->t_fb = tfb; 609 tp->t_fb_ptr = ptr; 610 } 611 612 static bool 613 tcp_recv_udp_tunneled_packet(struct mbuf *m, int off, struct inpcb *inp, 614 const struct sockaddr *sa, void *ctx) 615 { 616 struct ip *iph; 617 #ifdef INET6 618 struct ip6_hdr *ip6; 619 #endif 620 struct udphdr *uh; 621 struct tcphdr *th; 622 int thlen; 623 uint16_t port; 624 625 TCPSTAT_INC(tcps_tunneled_pkts); 626 if ((m->m_flags & M_PKTHDR) == 0) { 627 /* Can't handle one that is not a pkt hdr */ 628 TCPSTAT_INC(tcps_tunneled_errs); 629 goto out; 630 } 631 thlen = sizeof(struct tcphdr); 632 if (m->m_len < off + sizeof(struct udphdr) + thlen && 633 (m = m_pullup(m, off + sizeof(struct udphdr) + thlen)) == NULL) { 634 TCPSTAT_INC(tcps_tunneled_errs); 635 goto out; 636 } 637 iph = mtod(m, struct ip *); 638 uh = (struct udphdr *)((caddr_t)iph + off); 639 th = (struct tcphdr *)(uh + 1); 640 thlen = th->th_off << 2; 641 if (m->m_len < off + sizeof(struct udphdr) + thlen) { 642 m = m_pullup(m, off + sizeof(struct udphdr) + thlen); 643 if (m == NULL) { 644 TCPSTAT_INC(tcps_tunneled_errs); 645 goto out; 646 } else { 647 iph = mtod(m, struct ip *); 648 uh = (struct udphdr *)((caddr_t)iph + off); 649 th = (struct tcphdr *)(uh + 1); 650 } 651 } 652 m->m_pkthdr.tcp_tun_port = port = uh->uh_sport; 653 bcopy(th, uh, m->m_len - off); 654 m->m_len -= sizeof(struct udphdr); 655 m->m_pkthdr.len -= sizeof(struct udphdr); 656 /* 657 * We use the same algorithm for 658 * both UDP and TCP for c-sum. So 659 * the code in tcp_input will skip 660 * the checksum. So we do nothing 661 * with the flag (m->m_pkthdr.csum_flags). 662 */ 663 switch (iph->ip_v) { 664 #ifdef INET 665 case IPVERSION: 666 iph->ip_len = htons(ntohs(iph->ip_len) - sizeof(struct udphdr)); 667 tcp_input_with_port(&m, &off, IPPROTO_TCP, port); 668 break; 669 #endif 670 #ifdef INET6 671 case IPV6_VERSION >> 4: 672 ip6 = mtod(m, struct ip6_hdr *); 673 ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - sizeof(struct udphdr)); 674 tcp6_input_with_port(&m, &off, IPPROTO_TCP, port); 675 break; 676 #endif 677 default: 678 goto out; 679 break; 680 } 681 return (true); 682 out: 683 m_freem(m); 684 685 return (true); 686 } 687 688 static int 689 sysctl_net_inet_default_tcp_functions(SYSCTL_HANDLER_ARGS) 690 { 691 int error=ENOENT; 692 struct tcp_function_set fs; 693 struct tcp_function_block *blk; 694 695 memset(&fs, 0, sizeof(fs)); 696 rw_rlock(&tcp_function_lock); 697 blk = find_tcp_fb_locked(V_tcp_func_set_ptr, NULL); 698 if (blk) { 699 /* Found him */ 700 strcpy(fs.function_set_name, blk->tfb_tcp_block_name); 701 fs.pcbcnt = blk->tfb_refcnt; 702 } 703 rw_runlock(&tcp_function_lock); 704 error = sysctl_handle_string(oidp, fs.function_set_name, 705 sizeof(fs.function_set_name), req); 706 707 /* Check for error or no change */ 708 if (error != 0 || req->newptr == NULL) 709 return(error); 710 711 rw_wlock(&tcp_function_lock); 712 blk = find_tcp_functions_locked(&fs); 713 if ((blk == NULL) || 714 (blk->tfb_flags & TCP_FUNC_BEING_REMOVED)) { 715 error = ENOENT; 716 goto done; 717 } 718 V_tcp_func_set_ptr = blk; 719 done: 720 rw_wunlock(&tcp_function_lock); 721 return (error); 722 } 723 724 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_default, 725 CTLFLAG_VNET | CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_NEEDGIANT, 726 NULL, 0, sysctl_net_inet_default_tcp_functions, "A", 727 "Set/get the default TCP functions"); 728 729 static int 730 sysctl_net_inet_list_available(SYSCTL_HANDLER_ARGS) 731 { 732 int error, cnt, linesz; 733 struct tcp_function *f; 734 char *buffer, *cp; 735 size_t bufsz, outsz; 736 bool alias; 737 738 cnt = 0; 739 rw_rlock(&tcp_function_lock); 740 TAILQ_FOREACH(f, &t_functions, tf_next) { 741 cnt++; 742 } 743 rw_runlock(&tcp_function_lock); 744 745 bufsz = (cnt+2) * ((TCP_FUNCTION_NAME_LEN_MAX * 2) + 13) + 1; 746 buffer = malloc(bufsz, M_TEMP, M_WAITOK); 747 748 error = 0; 749 cp = buffer; 750 751 linesz = snprintf(cp, bufsz, "\n%-32s%c %-32s %s\n", "Stack", 'D', 752 "Alias", "PCB count"); 753 cp += linesz; 754 bufsz -= linesz; 755 outsz = linesz; 756 757 rw_rlock(&tcp_function_lock); 758 TAILQ_FOREACH(f, &t_functions, tf_next) { 759 alias = (f->tf_name != f->tf_fb->tfb_tcp_block_name); 760 linesz = snprintf(cp, bufsz, "%-32s%c %-32s %u\n", 761 f->tf_fb->tfb_tcp_block_name, 762 (f->tf_fb == V_tcp_func_set_ptr) ? '*' : ' ', 763 alias ? f->tf_name : "-", 764 f->tf_fb->tfb_refcnt); 765 if (linesz >= bufsz) { 766 error = EOVERFLOW; 767 break; 768 } 769 cp += linesz; 770 bufsz -= linesz; 771 outsz += linesz; 772 } 773 rw_runlock(&tcp_function_lock); 774 if (error == 0) 775 error = sysctl_handle_string(oidp, buffer, outsz + 1, req); 776 free(buffer, M_TEMP); 777 return (error); 778 } 779 780 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, functions_available, 781 CTLFLAG_VNET | CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_NEEDGIANT, 782 NULL, 0, sysctl_net_inet_list_available, "A", 783 "list available TCP Function sets"); 784 785 VNET_DEFINE(int, tcp_udp_tunneling_port) = TCP_TUNNELING_PORT_DEFAULT; 786 787 #ifdef INET 788 VNET_DEFINE(struct socket *, udp4_tun_socket) = NULL; 789 #define V_udp4_tun_socket VNET(udp4_tun_socket) 790 #endif 791 #ifdef INET6 792 VNET_DEFINE(struct socket *, udp6_tun_socket) = NULL; 793 #define V_udp6_tun_socket VNET(udp6_tun_socket) 794 #endif 795 796 static struct sx tcpoudp_lock; 797 798 static void 799 tcp_over_udp_stop(void) 800 { 801 802 sx_assert(&tcpoudp_lock, SA_XLOCKED); 803 804 #ifdef INET 805 if (V_udp4_tun_socket != NULL) { 806 soclose(V_udp4_tun_socket); 807 V_udp4_tun_socket = NULL; 808 } 809 #endif 810 #ifdef INET6 811 if (V_udp6_tun_socket != NULL) { 812 soclose(V_udp6_tun_socket); 813 V_udp6_tun_socket = NULL; 814 } 815 #endif 816 } 817 818 static int 819 tcp_over_udp_start(void) 820 { 821 uint16_t port; 822 int ret; 823 #ifdef INET 824 struct sockaddr_in sin; 825 #endif 826 #ifdef INET6 827 struct sockaddr_in6 sin6; 828 #endif 829 830 sx_assert(&tcpoudp_lock, SA_XLOCKED); 831 832 port = V_tcp_udp_tunneling_port; 833 if (ntohs(port) == 0) { 834 /* Must have a port set */ 835 return (EINVAL); 836 } 837 #ifdef INET 838 if (V_udp4_tun_socket != NULL) { 839 /* Already running -- must stop first */ 840 return (EALREADY); 841 } 842 #endif 843 #ifdef INET6 844 if (V_udp6_tun_socket != NULL) { 845 /* Already running -- must stop first */ 846 return (EALREADY); 847 } 848 #endif 849 #ifdef INET 850 if ((ret = socreate(PF_INET, &V_udp4_tun_socket, 851 SOCK_DGRAM, IPPROTO_UDP, 852 curthread->td_ucred, curthread))) { 853 tcp_over_udp_stop(); 854 return (ret); 855 } 856 /* Call the special UDP hook. */ 857 if ((ret = udp_set_kernel_tunneling(V_udp4_tun_socket, 858 tcp_recv_udp_tunneled_packet, 859 tcp_ctlinput_viaudp, 860 NULL))) { 861 tcp_over_udp_stop(); 862 return (ret); 863 } 864 /* Ok, we have a socket, bind it to the port. */ 865 memset(&sin, 0, sizeof(struct sockaddr_in)); 866 sin.sin_len = sizeof(struct sockaddr_in); 867 sin.sin_family = AF_INET; 868 sin.sin_port = htons(port); 869 if ((ret = sobind(V_udp4_tun_socket, 870 (struct sockaddr *)&sin, curthread))) { 871 tcp_over_udp_stop(); 872 return (ret); 873 } 874 #endif 875 #ifdef INET6 876 if ((ret = socreate(PF_INET6, &V_udp6_tun_socket, 877 SOCK_DGRAM, IPPROTO_UDP, 878 curthread->td_ucred, curthread))) { 879 tcp_over_udp_stop(); 880 return (ret); 881 } 882 /* Call the special UDP hook. */ 883 if ((ret = udp_set_kernel_tunneling(V_udp6_tun_socket, 884 tcp_recv_udp_tunneled_packet, 885 tcp6_ctlinput_viaudp, 886 NULL))) { 887 tcp_over_udp_stop(); 888 return (ret); 889 } 890 /* Ok, we have a socket, bind it to the port. */ 891 memset(&sin6, 0, sizeof(struct sockaddr_in6)); 892 sin6.sin6_len = sizeof(struct sockaddr_in6); 893 sin6.sin6_family = AF_INET6; 894 sin6.sin6_port = htons(port); 895 if ((ret = sobind(V_udp6_tun_socket, 896 (struct sockaddr *)&sin6, curthread))) { 897 tcp_over_udp_stop(); 898 return (ret); 899 } 900 #endif 901 return (0); 902 } 903 904 static int 905 sysctl_net_inet_tcp_udp_tunneling_port_check(SYSCTL_HANDLER_ARGS) 906 { 907 int error; 908 uint32_t old, new; 909 910 old = V_tcp_udp_tunneling_port; 911 new = old; 912 error = sysctl_handle_int(oidp, &new, 0, req); 913 if ((error == 0) && 914 (req->newptr != NULL)) { 915 if ((new < TCP_TUNNELING_PORT_MIN) || 916 (new > TCP_TUNNELING_PORT_MAX)) { 917 error = EINVAL; 918 } else { 919 sx_xlock(&tcpoudp_lock); 920 V_tcp_udp_tunneling_port = new; 921 if (old != 0) { 922 tcp_over_udp_stop(); 923 } 924 if (new != 0) { 925 error = tcp_over_udp_start(); 926 if (error != 0) { 927 V_tcp_udp_tunneling_port = 0; 928 } 929 } 930 sx_xunlock(&tcpoudp_lock); 931 } 932 } 933 return (error); 934 } 935 936 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, udp_tunneling_port, 937 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 938 &VNET_NAME(tcp_udp_tunneling_port), 939 0, &sysctl_net_inet_tcp_udp_tunneling_port_check, "IU", 940 "Tunneling port for tcp over udp"); 941 942 VNET_DEFINE(int, tcp_udp_tunneling_overhead) = TCP_TUNNELING_OVERHEAD_DEFAULT; 943 944 static int 945 sysctl_net_inet_tcp_udp_tunneling_overhead_check(SYSCTL_HANDLER_ARGS) 946 { 947 int error, new; 948 949 new = V_tcp_udp_tunneling_overhead; 950 error = sysctl_handle_int(oidp, &new, 0, req); 951 if (error == 0 && req->newptr) { 952 if ((new < TCP_TUNNELING_OVERHEAD_MIN) || 953 (new > TCP_TUNNELING_OVERHEAD_MAX)) 954 error = EINVAL; 955 else 956 V_tcp_udp_tunneling_overhead = new; 957 } 958 return (error); 959 } 960 961 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, udp_tunneling_overhead, 962 CTLFLAG_VNET | CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 963 &VNET_NAME(tcp_udp_tunneling_overhead), 964 0, &sysctl_net_inet_tcp_udp_tunneling_overhead_check, "IU", 965 "MSS reduction when using tcp over udp"); 966 967 /* 968 * Exports one (struct tcp_function_info) for each alias/name. 969 */ 970 static int 971 sysctl_net_inet_list_func_info(SYSCTL_HANDLER_ARGS) 972 { 973 int cnt, error; 974 struct tcp_function *f; 975 struct tcp_function_info tfi; 976 977 /* 978 * We don't allow writes. 979 */ 980 if (req->newptr != NULL) 981 return (EINVAL); 982 983 /* 984 * Wire the old buffer so we can directly copy the functions to 985 * user space without dropping the lock. 986 */ 987 if (req->oldptr != NULL) { 988 error = sysctl_wire_old_buffer(req, 0); 989 if (error) 990 return (error); 991 } 992 993 /* 994 * Walk the list and copy out matching entries. If INVARIANTS 995 * is compiled in, also walk the list to verify the length of 996 * the list matches what we have recorded. 997 */ 998 rw_rlock(&tcp_function_lock); 999 1000 cnt = 0; 1001 #ifndef INVARIANTS 1002 if (req->oldptr == NULL) { 1003 cnt = tcp_fb_cnt; 1004 goto skip_loop; 1005 } 1006 #endif 1007 TAILQ_FOREACH(f, &t_functions, tf_next) { 1008 #ifdef INVARIANTS 1009 cnt++; 1010 #endif 1011 if (req->oldptr != NULL) { 1012 bzero(&tfi, sizeof(tfi)); 1013 tfi.tfi_refcnt = f->tf_fb->tfb_refcnt; 1014 tfi.tfi_id = f->tf_fb->tfb_id; 1015 (void)strlcpy(tfi.tfi_alias, f->tf_name, 1016 sizeof(tfi.tfi_alias)); 1017 (void)strlcpy(tfi.tfi_name, 1018 f->tf_fb->tfb_tcp_block_name, sizeof(tfi.tfi_name)); 1019 error = SYSCTL_OUT(req, &tfi, sizeof(tfi)); 1020 /* 1021 * Don't stop on error, as that is the 1022 * mechanism we use to accumulate length 1023 * information if the buffer was too short. 1024 */ 1025 } 1026 } 1027 KASSERT(cnt == tcp_fb_cnt, 1028 ("%s: cnt (%d) != tcp_fb_cnt (%d)", __func__, cnt, tcp_fb_cnt)); 1029 #ifndef INVARIANTS 1030 skip_loop: 1031 #endif 1032 rw_runlock(&tcp_function_lock); 1033 if (req->oldptr == NULL) 1034 error = SYSCTL_OUT(req, NULL, 1035 (cnt + 1) * sizeof(struct tcp_function_info)); 1036 1037 return (error); 1038 } 1039 1040 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, function_info, 1041 CTLTYPE_OPAQUE | CTLFLAG_SKIP | CTLFLAG_RD | CTLFLAG_MPSAFE, 1042 NULL, 0, sysctl_net_inet_list_func_info, "S,tcp_function_info", 1043 "List TCP function block name-to-ID mappings"); 1044 1045 /* 1046 * tfb_tcp_handoff_ok() function for the default stack. 1047 * Note that we'll basically try to take all comers. 1048 */ 1049 static int 1050 tcp_default_handoff_ok(struct tcpcb *tp) 1051 { 1052 1053 return (0); 1054 } 1055 1056 /* 1057 * tfb_tcp_fb_init() function for the default stack. 1058 * 1059 * This handles making sure we have appropriate timers set if you are 1060 * transitioning a socket that has some amount of setup done. 1061 * 1062 * The init() fuction from the default can *never* return non-zero i.e. 1063 * it is required to always succeed since it is the stack of last resort! 1064 */ 1065 static int 1066 tcp_default_fb_init(struct tcpcb *tp, void **ptr) 1067 { 1068 struct socket *so = tptosocket(tp); 1069 int rexmt; 1070 1071 INP_WLOCK_ASSERT(tptoinpcb(tp)); 1072 /* We don't use the pointer */ 1073 *ptr = NULL; 1074 1075 KASSERT(tp->t_state >= 0 && tp->t_state < TCPS_TIME_WAIT, 1076 ("%s: connection %p in unexpected state %d", __func__, tp, 1077 tp->t_state)); 1078 1079 /* Make sure we get no interesting mbuf queuing behavior */ 1080 /* All mbuf queue/ack compress flags should be off */ 1081 tcp_lro_features_off(tp); 1082 1083 /* Cancel the GP measurement in progress */ 1084 tp->t_flags &= ~TF_GPUTINPROG; 1085 /* Validate the timers are not in usec, if they are convert */ 1086 tcp_change_time_units(tp, TCP_TMR_GRANULARITY_TICKS); 1087 if ((tp->t_state == TCPS_SYN_SENT) || 1088 (tp->t_state == TCPS_SYN_RECEIVED)) 1089 rexmt = tcp_rexmit_initial * tcp_backoff[tp->t_rxtshift]; 1090 else 1091 rexmt = TCP_REXMTVAL(tp) * tcp_backoff[tp->t_rxtshift]; 1092 if (tp->t_rxtshift == 0) 1093 tp->t_rxtcur = rexmt; 1094 else 1095 TCPT_RANGESET(tp->t_rxtcur, rexmt, tp->t_rttmin, TCPTV_REXMTMAX); 1096 1097 /* 1098 * Nothing to do for ESTABLISHED or LISTEN states. And, we don't 1099 * know what to do for unexpected states (which includes TIME_WAIT). 1100 */ 1101 if (tp->t_state <= TCPS_LISTEN || tp->t_state >= TCPS_TIME_WAIT) 1102 return (0); 1103 1104 /* 1105 * Make sure some kind of transmission timer is set if there is 1106 * outstanding data. 1107 */ 1108 if ((!TCPS_HAVEESTABLISHED(tp->t_state) || sbavail(&so->so_snd) || 1109 tp->snd_una != tp->snd_max) && !(tcp_timer_active(tp, TT_REXMT) || 1110 tcp_timer_active(tp, TT_PERSIST))) { 1111 /* 1112 * If the session has established and it looks like it should 1113 * be in the persist state, set the persist timer. Otherwise, 1114 * set the retransmit timer. 1115 */ 1116 if (TCPS_HAVEESTABLISHED(tp->t_state) && tp->snd_wnd == 0 && 1117 (int32_t)(tp->snd_nxt - tp->snd_una) < 1118 (int32_t)sbavail(&so->so_snd)) 1119 tcp_setpersist(tp); 1120 else 1121 tcp_timer_activate(tp, TT_REXMT, TP_RXTCUR(tp)); 1122 } 1123 1124 /* All non-embryonic sessions get a keepalive timer. */ 1125 if (!tcp_timer_active(tp, TT_KEEP)) 1126 tcp_timer_activate(tp, TT_KEEP, 1127 TCPS_HAVEESTABLISHED(tp->t_state) ? TP_KEEPIDLE(tp) : 1128 TP_KEEPINIT(tp)); 1129 1130 /* 1131 * Make sure critical variables are initialized 1132 * if transitioning while in Recovery. 1133 */ 1134 if IN_FASTRECOVERY(tp->t_flags) { 1135 if (tp->sackhint.recover_fs == 0) 1136 tp->sackhint.recover_fs = max(1, 1137 tp->snd_nxt - tp->snd_una); 1138 } 1139 1140 return (0); 1141 } 1142 1143 /* 1144 * tfb_tcp_fb_fini() function for the default stack. 1145 * 1146 * This changes state as necessary (or prudent) to prepare for another stack 1147 * to assume responsibility for the connection. 1148 */ 1149 static void 1150 tcp_default_fb_fini(struct tcpcb *tp, int tcb_is_purged) 1151 { 1152 1153 INP_WLOCK_ASSERT(tptoinpcb(tp)); 1154 1155 #ifdef TCP_BLACKBOX 1156 tcp_log_flowend(tp); 1157 #endif 1158 tp->t_acktime = 0; 1159 return; 1160 } 1161 1162 MALLOC_DEFINE(M_TCPLOG, "tcplog", "TCP address and flags print buffers"); 1163 MALLOC_DEFINE(M_TCPFUNCTIONS, "tcpfunc", "TCP function set memory"); 1164 1165 static struct mtx isn_mtx; 1166 1167 #define ISN_LOCK_INIT() mtx_init(&isn_mtx, "isn_mtx", NULL, MTX_DEF) 1168 #define ISN_LOCK() mtx_lock(&isn_mtx) 1169 #define ISN_UNLOCK() mtx_unlock(&isn_mtx) 1170 1171 INPCBSTORAGE_DEFINE(tcpcbstor, tcpcb, "tcpinp", "tcp_inpcb", "tcp", "tcphash"); 1172 1173 /* 1174 * Take a value and get the next power of 2 that doesn't overflow. 1175 * Used to size the tcp_inpcb hash buckets. 1176 */ 1177 static int 1178 maketcp_hashsize(int size) 1179 { 1180 int hashsize; 1181 1182 /* 1183 * auto tune. 1184 * get the next power of 2 higher than maxsockets. 1185 */ 1186 hashsize = 1 << fls(size); 1187 /* catch overflow, and just go one power of 2 smaller */ 1188 if (hashsize < size) { 1189 hashsize = 1 << (fls(size) - 1); 1190 } 1191 return (hashsize); 1192 } 1193 1194 static volatile int next_tcp_stack_id = 1; 1195 1196 /* 1197 * Register a TCP function block with the name provided in the names 1198 * array. (Note that this function does NOT automatically register 1199 * blk->tfb_tcp_block_name as a stack name. Therefore, you should 1200 * explicitly include blk->tfb_tcp_block_name in the list of names if 1201 * you wish to register the stack with that name.) 1202 * 1203 * Either all name registrations will succeed or all will fail. If 1204 * a name registration fails, the function will update the num_names 1205 * argument to point to the array index of the name that encountered 1206 * the failure. 1207 * 1208 * Returns 0 on success, or an error code on failure. 1209 */ 1210 int 1211 register_tcp_functions_as_names(struct tcp_function_block *blk, int wait, 1212 const char *names[], int *num_names) 1213 { 1214 struct tcp_function *n; 1215 struct tcp_function_set fs; 1216 int error, i; 1217 1218 KASSERT(names != NULL && *num_names > 0, 1219 ("%s: Called with 0-length name list", __func__)); 1220 KASSERT(names != NULL, ("%s: Called with NULL name list", __func__)); 1221 KASSERT(rw_initialized(&tcp_function_lock), 1222 ("%s: called too early", __func__)); 1223 1224 if ((blk->tfb_tcp_output == NULL) || 1225 (blk->tfb_tcp_do_segment == NULL) || 1226 (blk->tfb_tcp_ctloutput == NULL) || 1227 (strlen(blk->tfb_tcp_block_name) == 0)) { 1228 /* 1229 * These functions are required and you 1230 * need a name. 1231 */ 1232 *num_names = 0; 1233 return (EINVAL); 1234 } 1235 1236 if (blk->tfb_flags & TCP_FUNC_BEING_REMOVED) { 1237 *num_names = 0; 1238 return (EINVAL); 1239 } 1240 1241 refcount_init(&blk->tfb_refcnt, 0); 1242 blk->tfb_id = atomic_fetchadd_int(&next_tcp_stack_id, 1); 1243 for (i = 0; i < *num_names; i++) { 1244 n = malloc(sizeof(struct tcp_function), M_TCPFUNCTIONS, wait); 1245 if (n == NULL) { 1246 error = ENOMEM; 1247 goto cleanup; 1248 } 1249 n->tf_fb = blk; 1250 1251 (void)strlcpy(fs.function_set_name, names[i], 1252 sizeof(fs.function_set_name)); 1253 rw_wlock(&tcp_function_lock); 1254 if (find_tcp_functions_locked(&fs) != NULL) { 1255 /* Duplicate name space not allowed */ 1256 rw_wunlock(&tcp_function_lock); 1257 free(n, M_TCPFUNCTIONS); 1258 error = EALREADY; 1259 goto cleanup; 1260 } 1261 (void)strlcpy(n->tf_name, names[i], sizeof(n->tf_name)); 1262 TAILQ_INSERT_TAIL(&t_functions, n, tf_next); 1263 tcp_fb_cnt++; 1264 rw_wunlock(&tcp_function_lock); 1265 } 1266 return(0); 1267 1268 cleanup: 1269 /* 1270 * Deregister the names we just added. Because registration failed 1271 * for names[i], we don't need to deregister that name. 1272 */ 1273 *num_names = i; 1274 rw_wlock(&tcp_function_lock); 1275 while (--i >= 0) { 1276 TAILQ_FOREACH(n, &t_functions, tf_next) { 1277 if (!strncmp(n->tf_name, names[i], 1278 TCP_FUNCTION_NAME_LEN_MAX)) { 1279 TAILQ_REMOVE(&t_functions, n, tf_next); 1280 tcp_fb_cnt--; 1281 n->tf_fb = NULL; 1282 free(n, M_TCPFUNCTIONS); 1283 break; 1284 } 1285 } 1286 } 1287 rw_wunlock(&tcp_function_lock); 1288 return (error); 1289 } 1290 1291 /* 1292 * Register a TCP function block using the name provided in the name 1293 * argument. 1294 * 1295 * Returns 0 on success, or an error code on failure. 1296 */ 1297 int 1298 register_tcp_functions_as_name(struct tcp_function_block *blk, const char *name, 1299 int wait) 1300 { 1301 const char *name_list[1]; 1302 int num_names, rv; 1303 1304 num_names = 1; 1305 if (name != NULL) 1306 name_list[0] = name; 1307 else 1308 name_list[0] = blk->tfb_tcp_block_name; 1309 rv = register_tcp_functions_as_names(blk, wait, name_list, &num_names); 1310 return (rv); 1311 } 1312 1313 /* 1314 * Register a TCP function block using the name defined in 1315 * blk->tfb_tcp_block_name. 1316 * 1317 * Returns 0 on success, or an error code on failure. 1318 */ 1319 int 1320 register_tcp_functions(struct tcp_function_block *blk, int wait) 1321 { 1322 1323 return (register_tcp_functions_as_name(blk, NULL, wait)); 1324 } 1325 1326 /* 1327 * Deregister all names associated with a function block. This 1328 * functionally removes the function block from use within the system. 1329 * 1330 * When called with a true quiesce argument, mark the function block 1331 * as being removed so no more stacks will use it and determine 1332 * whether the removal would succeed. 1333 * 1334 * When called with a false quiesce argument, actually attempt the 1335 * removal. 1336 * 1337 * When called with a force argument, attempt to switch all TCBs to 1338 * use the default stack instead of returning EBUSY. 1339 * 1340 * Returns 0 on success (or if the removal would succeed), or an error 1341 * code on failure. 1342 */ 1343 int 1344 deregister_tcp_functions(struct tcp_function_block *blk, bool quiesce, 1345 bool force) 1346 { 1347 struct tcp_function *f; 1348 VNET_ITERATOR_DECL(vnet_iter); 1349 1350 if (blk == &tcp_def_funcblk) { 1351 /* You can't un-register the default */ 1352 return (EPERM); 1353 } 1354 rw_wlock(&tcp_function_lock); 1355 VNET_LIST_RLOCK_NOSLEEP(); 1356 VNET_FOREACH(vnet_iter) { 1357 CURVNET_SET(vnet_iter); 1358 if (blk == V_tcp_func_set_ptr) { 1359 /* You can't free the current default in some vnet. */ 1360 CURVNET_RESTORE(); 1361 VNET_LIST_RUNLOCK_NOSLEEP(); 1362 rw_wunlock(&tcp_function_lock); 1363 return (EBUSY); 1364 } 1365 CURVNET_RESTORE(); 1366 } 1367 VNET_LIST_RUNLOCK_NOSLEEP(); 1368 /* Mark the block so no more stacks can use it. */ 1369 blk->tfb_flags |= TCP_FUNC_BEING_REMOVED; 1370 /* 1371 * If TCBs are still attached to the stack, attempt to switch them 1372 * to the default stack. 1373 */ 1374 if (force && blk->tfb_refcnt) { 1375 struct inpcb *inp; 1376 struct tcpcb *tp; 1377 VNET_ITERATOR_DECL(vnet_iter); 1378 1379 rw_wunlock(&tcp_function_lock); 1380 1381 VNET_LIST_RLOCK(); 1382 VNET_FOREACH(vnet_iter) { 1383 CURVNET_SET(vnet_iter); 1384 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_tcbinfo, 1385 INPLOOKUP_WLOCKPCB); 1386 1387 while ((inp = inp_next(&inpi)) != NULL) { 1388 tp = intotcpcb(inp); 1389 if (tp == NULL || tp->t_fb != blk) 1390 continue; 1391 tcp_switch_back_to_default(tp); 1392 } 1393 CURVNET_RESTORE(); 1394 } 1395 VNET_LIST_RUNLOCK(); 1396 1397 rw_wlock(&tcp_function_lock); 1398 } 1399 if (blk->tfb_refcnt) { 1400 /* TCBs still attached. */ 1401 rw_wunlock(&tcp_function_lock); 1402 return (EBUSY); 1403 } 1404 if (quiesce) { 1405 /* Skip removal. */ 1406 rw_wunlock(&tcp_function_lock); 1407 return (0); 1408 } 1409 /* Remove any function names that map to this function block. */ 1410 while (find_tcp_fb_locked(blk, &f) != NULL) { 1411 TAILQ_REMOVE(&t_functions, f, tf_next); 1412 tcp_fb_cnt--; 1413 f->tf_fb = NULL; 1414 free(f, M_TCPFUNCTIONS); 1415 } 1416 rw_wunlock(&tcp_function_lock); 1417 return (0); 1418 } 1419 1420 static void 1421 tcp_drain(void) 1422 { 1423 struct epoch_tracker et; 1424 VNET_ITERATOR_DECL(vnet_iter); 1425 1426 if (!do_tcpdrain) 1427 return; 1428 1429 NET_EPOCH_ENTER(et); 1430 VNET_LIST_RLOCK_NOSLEEP(); 1431 VNET_FOREACH(vnet_iter) { 1432 CURVNET_SET(vnet_iter); 1433 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_tcbinfo, 1434 INPLOOKUP_WLOCKPCB); 1435 struct inpcb *inpb; 1436 struct tcpcb *tcpb; 1437 1438 /* 1439 * Walk the tcpbs, if existing, and flush the reassembly queue, 1440 * if there is one... 1441 * XXX: The "Net/3" implementation doesn't imply that the TCP 1442 * reassembly queue should be flushed, but in a situation 1443 * where we're really low on mbufs, this is potentially 1444 * useful. 1445 */ 1446 while ((inpb = inp_next(&inpi)) != NULL) { 1447 if ((tcpb = intotcpcb(inpb)) != NULL) { 1448 tcp_reass_flush(tcpb); 1449 tcp_clean_sackreport(tcpb); 1450 #ifdef TCP_BLACKBOX 1451 tcp_log_drain(tcpb); 1452 #endif 1453 #ifdef TCPPCAP 1454 if (tcp_pcap_aggressive_free) { 1455 /* Free the TCP PCAP queues. */ 1456 tcp_pcap_drain(&(tcpb->t_inpkts)); 1457 tcp_pcap_drain(&(tcpb->t_outpkts)); 1458 } 1459 #endif 1460 } 1461 } 1462 CURVNET_RESTORE(); 1463 } 1464 VNET_LIST_RUNLOCK_NOSLEEP(); 1465 NET_EPOCH_EXIT(et); 1466 } 1467 1468 static void 1469 tcp_vnet_init(void *arg __unused) 1470 { 1471 1472 #ifdef TCP_HHOOK 1473 if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN, 1474 &V_tcp_hhh[HHOOK_TCP_EST_IN], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0) 1475 printf("%s: WARNING: unable to register helper hook\n", __func__); 1476 if (hhook_head_register(HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT, 1477 &V_tcp_hhh[HHOOK_TCP_EST_OUT], HHOOK_NOWAIT|HHOOK_HEADISINVNET) != 0) 1478 printf("%s: WARNING: unable to register helper hook\n", __func__); 1479 #endif 1480 #ifdef STATS 1481 if (tcp_stats_init()) 1482 printf("%s: WARNING: unable to initialise TCP stats\n", 1483 __func__); 1484 #endif 1485 in_pcbinfo_init(&V_tcbinfo, &tcpcbstor, tcp_tcbhashsize, 1486 tcp_tcbhashsize); 1487 1488 syncache_init(); 1489 tcp_hc_init(); 1490 1491 TUNABLE_INT_FETCH("net.inet.tcp.sack.enable", &V_tcp_do_sack); 1492 V_sack_hole_zone = uma_zcreate("sackhole", sizeof(struct sackhole), 1493 NULL, NULL, NULL, NULL, UMA_ALIGN_PTR, 0); 1494 1495 tcp_fastopen_init(); 1496 1497 COUNTER_ARRAY_ALLOC(V_tcps_states, TCP_NSTATES, M_WAITOK); 1498 VNET_PCPUSTAT_ALLOC(tcpstat, M_WAITOK); 1499 1500 V_tcp_msl = TCPTV_MSL; 1501 } 1502 VNET_SYSINIT(tcp_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, 1503 tcp_vnet_init, NULL); 1504 1505 static void 1506 tcp_init(void *arg __unused) 1507 { 1508 int hashsize; 1509 1510 tcp_reass_global_init(); 1511 1512 /* XXX virtualize those below? */ 1513 tcp_delacktime = TCPTV_DELACK; 1514 tcp_keepinit = TCPTV_KEEP_INIT; 1515 tcp_keepidle = TCPTV_KEEP_IDLE; 1516 tcp_keepintvl = TCPTV_KEEPINTVL; 1517 tcp_maxpersistidle = TCPTV_KEEP_IDLE; 1518 tcp_rexmit_initial = TCPTV_RTOBASE; 1519 if (tcp_rexmit_initial < 1) 1520 tcp_rexmit_initial = 1; 1521 tcp_rexmit_min = TCPTV_MIN; 1522 if (tcp_rexmit_min < 1) 1523 tcp_rexmit_min = 1; 1524 tcp_persmin = TCPTV_PERSMIN; 1525 tcp_persmax = TCPTV_PERSMAX; 1526 tcp_rexmit_slop = TCPTV_CPU_VAR; 1527 tcp_finwait2_timeout = TCPTV_FINWAIT2_TIMEOUT; 1528 1529 /* Setup the tcp function block list */ 1530 TAILQ_INIT(&t_functions); 1531 rw_init(&tcp_function_lock, "tcp_func_lock"); 1532 register_tcp_functions(&tcp_def_funcblk, M_WAITOK); 1533 sx_init(&tcpoudp_lock, "TCP over UDP configuration"); 1534 #ifdef TCP_BLACKBOX 1535 /* Initialize the TCP logging data. */ 1536 tcp_log_init(); 1537 #endif 1538 arc4rand(&V_ts_offset_secret, sizeof(V_ts_offset_secret), 0); 1539 1540 if (tcp_soreceive_stream) { 1541 #ifdef INET 1542 tcp_protosw.pr_soreceive = soreceive_stream; 1543 #endif 1544 #ifdef INET6 1545 tcp6_protosw.pr_soreceive = soreceive_stream; 1546 #endif /* INET6 */ 1547 } 1548 1549 #ifdef INET6 1550 max_protohdr_grow(sizeof(struct ip6_hdr) + sizeof(struct tcphdr)); 1551 #else /* INET6 */ 1552 max_protohdr_grow(sizeof(struct tcpiphdr)); 1553 #endif /* INET6 */ 1554 1555 ISN_LOCK_INIT(); 1556 EVENTHANDLER_REGISTER(shutdown_pre_sync, tcp_fini, NULL, 1557 SHUTDOWN_PRI_DEFAULT); 1558 EVENTHANDLER_REGISTER(vm_lowmem, tcp_drain, NULL, LOWMEM_PRI_DEFAULT); 1559 EVENTHANDLER_REGISTER(mbuf_lowmem, tcp_drain, NULL, LOWMEM_PRI_DEFAULT); 1560 1561 tcp_inp_lro_direct_queue = counter_u64_alloc(M_WAITOK); 1562 tcp_inp_lro_wokeup_queue = counter_u64_alloc(M_WAITOK); 1563 tcp_inp_lro_compressed = counter_u64_alloc(M_WAITOK); 1564 tcp_inp_lro_locks_taken = counter_u64_alloc(M_WAITOK); 1565 tcp_extra_mbuf = counter_u64_alloc(M_WAITOK); 1566 tcp_would_have_but = counter_u64_alloc(M_WAITOK); 1567 tcp_comp_total = counter_u64_alloc(M_WAITOK); 1568 tcp_uncomp_total = counter_u64_alloc(M_WAITOK); 1569 tcp_bad_csums = counter_u64_alloc(M_WAITOK); 1570 tcp_pacing_failures = counter_u64_alloc(M_WAITOK); 1571 #ifdef TCPPCAP 1572 tcp_pcap_init(); 1573 #endif 1574 1575 hashsize = tcp_tcbhashsize; 1576 if (hashsize == 0) { 1577 /* 1578 * Auto tune the hash size based on maxsockets. 1579 * A perfect hash would have a 1:1 mapping 1580 * (hashsize = maxsockets) however it's been 1581 * suggested that O(2) average is better. 1582 */ 1583 hashsize = maketcp_hashsize(maxsockets / 4); 1584 /* 1585 * Our historical default is 512, 1586 * do not autotune lower than this. 1587 */ 1588 if (hashsize < 512) 1589 hashsize = 512; 1590 if (bootverbose) 1591 printf("%s: %s auto tuned to %d\n", __func__, 1592 "net.inet.tcp.tcbhashsize", hashsize); 1593 } 1594 /* 1595 * We require a hashsize to be a power of two. 1596 * Previously if it was not a power of two we would just reset it 1597 * back to 512, which could be a nasty surprise if you did not notice 1598 * the error message. 1599 * Instead what we do is clip it to the closest power of two lower 1600 * than the specified hash value. 1601 */ 1602 if (!powerof2(hashsize)) { 1603 int oldhashsize = hashsize; 1604 1605 hashsize = maketcp_hashsize(hashsize); 1606 /* prevent absurdly low value */ 1607 if (hashsize < 16) 1608 hashsize = 16; 1609 printf("%s: WARNING: TCB hash size not a power of 2, " 1610 "clipped from %d to %d.\n", __func__, oldhashsize, 1611 hashsize); 1612 } 1613 tcp_tcbhashsize = hashsize; 1614 1615 #ifdef INET 1616 IPPROTO_REGISTER(IPPROTO_TCP, tcp_input, tcp_ctlinput); 1617 #endif 1618 #ifdef INET6 1619 IP6PROTO_REGISTER(IPPROTO_TCP, tcp6_input, tcp6_ctlinput); 1620 #endif 1621 } 1622 SYSINIT(tcp_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, tcp_init, NULL); 1623 1624 #ifdef VIMAGE 1625 static void 1626 tcp_destroy(void *unused __unused) 1627 { 1628 int n; 1629 #ifdef TCP_HHOOK 1630 int error; 1631 #endif 1632 1633 /* 1634 * All our processes are gone, all our sockets should be cleaned 1635 * up, which means, we should be past the tcp_discardcb() calls. 1636 * Sleep to let all tcpcb timers really disappear and cleanup. 1637 */ 1638 for (;;) { 1639 INP_INFO_WLOCK(&V_tcbinfo); 1640 n = V_tcbinfo.ipi_count; 1641 INP_INFO_WUNLOCK(&V_tcbinfo); 1642 if (n == 0) 1643 break; 1644 pause("tcpdes", hz / 10); 1645 } 1646 tcp_hc_destroy(); 1647 syncache_destroy(); 1648 in_pcbinfo_destroy(&V_tcbinfo); 1649 /* tcp_discardcb() clears the sack_holes up. */ 1650 uma_zdestroy(V_sack_hole_zone); 1651 1652 /* 1653 * Cannot free the zone until all tcpcbs are released as we attach 1654 * the allocations to them. 1655 */ 1656 tcp_fastopen_destroy(); 1657 1658 COUNTER_ARRAY_FREE(V_tcps_states, TCP_NSTATES); 1659 VNET_PCPUSTAT_FREE(tcpstat); 1660 1661 #ifdef TCP_HHOOK 1662 error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_IN]); 1663 if (error != 0) { 1664 printf("%s: WARNING: unable to deregister helper hook " 1665 "type=%d, id=%d: error %d returned\n", __func__, 1666 HHOOK_TYPE_TCP, HHOOK_TCP_EST_IN, error); 1667 } 1668 error = hhook_head_deregister(V_tcp_hhh[HHOOK_TCP_EST_OUT]); 1669 if (error != 0) { 1670 printf("%s: WARNING: unable to deregister helper hook " 1671 "type=%d, id=%d: error %d returned\n", __func__, 1672 HHOOK_TYPE_TCP, HHOOK_TCP_EST_OUT, error); 1673 } 1674 #endif 1675 } 1676 VNET_SYSUNINIT(tcp, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, tcp_destroy, NULL); 1677 #endif 1678 1679 void 1680 tcp_fini(void *xtp) 1681 { 1682 1683 } 1684 1685 /* 1686 * Fill in the IP and TCP headers for an outgoing packet, given the tcpcb. 1687 * tcp_template used to store this data in mbufs, but we now recopy it out 1688 * of the tcpcb each time to conserve mbufs. 1689 */ 1690 void 1691 tcpip_fillheaders(struct inpcb *inp, uint16_t port, void *ip_ptr, void *tcp_ptr) 1692 { 1693 struct tcphdr *th = (struct tcphdr *)tcp_ptr; 1694 1695 INP_WLOCK_ASSERT(inp); 1696 1697 #ifdef INET6 1698 if ((inp->inp_vflag & INP_IPV6) != 0) { 1699 struct ip6_hdr *ip6; 1700 1701 ip6 = (struct ip6_hdr *)ip_ptr; 1702 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) | 1703 (inp->inp_flow & IPV6_FLOWINFO_MASK); 1704 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) | 1705 (IPV6_VERSION & IPV6_VERSION_MASK); 1706 if (port == 0) 1707 ip6->ip6_nxt = IPPROTO_TCP; 1708 else 1709 ip6->ip6_nxt = IPPROTO_UDP; 1710 ip6->ip6_plen = htons(sizeof(struct tcphdr)); 1711 ip6->ip6_src = inp->in6p_laddr; 1712 ip6->ip6_dst = inp->in6p_faddr; 1713 } 1714 #endif /* INET6 */ 1715 #if defined(INET6) && defined(INET) 1716 else 1717 #endif 1718 #ifdef INET 1719 { 1720 struct ip *ip; 1721 1722 ip = (struct ip *)ip_ptr; 1723 ip->ip_v = IPVERSION; 1724 ip->ip_hl = 5; 1725 ip->ip_tos = inp->inp_ip_tos; 1726 ip->ip_len = 0; 1727 ip->ip_id = 0; 1728 ip->ip_off = 0; 1729 ip->ip_ttl = inp->inp_ip_ttl; 1730 ip->ip_sum = 0; 1731 if (port == 0) 1732 ip->ip_p = IPPROTO_TCP; 1733 else 1734 ip->ip_p = IPPROTO_UDP; 1735 ip->ip_src = inp->inp_laddr; 1736 ip->ip_dst = inp->inp_faddr; 1737 } 1738 #endif /* INET */ 1739 th->th_sport = inp->inp_lport; 1740 th->th_dport = inp->inp_fport; 1741 th->th_seq = 0; 1742 th->th_ack = 0; 1743 th->th_off = 5; 1744 tcp_set_flags(th, 0); 1745 th->th_win = 0; 1746 th->th_urp = 0; 1747 th->th_sum = 0; /* in_pseudo() is called later for ipv4 */ 1748 } 1749 1750 /* 1751 * Create template to be used to send tcp packets on a connection. 1752 * Allocates an mbuf and fills in a skeletal tcp/ip header. The only 1753 * use for this function is in keepalives, which use tcp_respond. 1754 */ 1755 struct tcptemp * 1756 tcpip_maketemplate(struct inpcb *inp) 1757 { 1758 struct tcptemp *t; 1759 1760 t = malloc(sizeof(*t), M_TEMP, M_NOWAIT); 1761 if (t == NULL) 1762 return (NULL); 1763 tcpip_fillheaders(inp, 0, (void *)&t->tt_ipgen, (void *)&t->tt_t); 1764 return (t); 1765 } 1766 1767 /* 1768 * Send a single message to the TCP at address specified by 1769 * the given TCP/IP header. If m == NULL, then we make a copy 1770 * of the tcpiphdr at th and send directly to the addressed host. 1771 * This is used to force keep alive messages out using the TCP 1772 * template for a connection. If flags are given then we send 1773 * a message back to the TCP which originated the segment th, 1774 * and discard the mbuf containing it and any other attached mbufs. 1775 * 1776 * In any case the ack and sequence number of the transmitted 1777 * segment are as specified by the parameters. 1778 * 1779 * NOTE: If m != NULL, then th must point to *inside* the mbuf. 1780 */ 1781 void 1782 tcp_respond(struct tcpcb *tp, void *ipgen, struct tcphdr *th, struct mbuf *m, 1783 tcp_seq ack, tcp_seq seq, uint16_t flags) 1784 { 1785 struct tcpopt to; 1786 struct inpcb *inp; 1787 struct ip *ip; 1788 struct mbuf *optm; 1789 struct udphdr *uh = NULL; 1790 struct tcphdr *nth; 1791 struct tcp_log_buffer *lgb; 1792 u_char *optp; 1793 #ifdef INET6 1794 struct ip6_hdr *ip6; 1795 int isipv6; 1796 #endif /* INET6 */ 1797 int optlen, tlen, win, ulen; 1798 int ect = 0; 1799 bool incl_opts; 1800 uint16_t port; 1801 int output_ret; 1802 #ifdef INVARIANTS 1803 int thflags = tcp_get_flags(th); 1804 #endif 1805 1806 KASSERT(tp != NULL || m != NULL, ("tcp_respond: tp and m both NULL")); 1807 NET_EPOCH_ASSERT(); 1808 1809 #ifdef INET6 1810 isipv6 = ((struct ip *)ipgen)->ip_v == (IPV6_VERSION >> 4); 1811 ip6 = ipgen; 1812 #endif /* INET6 */ 1813 ip = ipgen; 1814 1815 if (tp != NULL) { 1816 inp = tptoinpcb(tp); 1817 INP_LOCK_ASSERT(inp); 1818 } else 1819 inp = NULL; 1820 1821 if (m != NULL) { 1822 #ifdef INET6 1823 if (isipv6 && ip6 && (ip6->ip6_nxt == IPPROTO_UDP)) 1824 port = m->m_pkthdr.tcp_tun_port; 1825 else 1826 #endif 1827 if (ip && (ip->ip_p == IPPROTO_UDP)) 1828 port = m->m_pkthdr.tcp_tun_port; 1829 else 1830 port = 0; 1831 } else 1832 port = tp->t_port; 1833 1834 incl_opts = false; 1835 win = 0; 1836 if (tp != NULL) { 1837 if (!(flags & TH_RST)) { 1838 win = sbspace(&inp->inp_socket->so_rcv); 1839 if (win > TCP_MAXWIN << tp->rcv_scale) 1840 win = TCP_MAXWIN << tp->rcv_scale; 1841 } 1842 if ((tp->t_flags & TF_NOOPT) == 0) 1843 incl_opts = true; 1844 } 1845 if (m == NULL) { 1846 m = m_gethdr(M_NOWAIT, MT_DATA); 1847 if (m == NULL) 1848 return; 1849 m->m_data += max_linkhdr; 1850 #ifdef INET6 1851 if (isipv6) { 1852 bcopy((caddr_t)ip6, mtod(m, caddr_t), 1853 sizeof(struct ip6_hdr)); 1854 ip6 = mtod(m, struct ip6_hdr *); 1855 nth = (struct tcphdr *)(ip6 + 1); 1856 if (port) { 1857 /* Insert a UDP header */ 1858 uh = (struct udphdr *)nth; 1859 uh->uh_sport = htons(V_tcp_udp_tunneling_port); 1860 uh->uh_dport = port; 1861 nth = (struct tcphdr *)(uh + 1); 1862 } 1863 } else 1864 #endif /* INET6 */ 1865 { 1866 bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip)); 1867 ip = mtod(m, struct ip *); 1868 nth = (struct tcphdr *)(ip + 1); 1869 if (port) { 1870 /* Insert a UDP header */ 1871 uh = (struct udphdr *)nth; 1872 uh->uh_sport = htons(V_tcp_udp_tunneling_port); 1873 uh->uh_dport = port; 1874 nth = (struct tcphdr *)(uh + 1); 1875 } 1876 } 1877 bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr)); 1878 flags = TH_ACK; 1879 } else if ((!M_WRITABLE(m)) || (port != 0)) { 1880 struct mbuf *n; 1881 1882 /* Can't reuse 'm', allocate a new mbuf. */ 1883 n = m_gethdr(M_NOWAIT, MT_DATA); 1884 if (n == NULL) { 1885 m_freem(m); 1886 return; 1887 } 1888 1889 if (!m_dup_pkthdr(n, m, M_NOWAIT)) { 1890 m_freem(m); 1891 m_freem(n); 1892 return; 1893 } 1894 1895 n->m_data += max_linkhdr; 1896 /* m_len is set later */ 1897 #define xchg(a,b,type) { type t; t=a; a=b; b=t; } 1898 #ifdef INET6 1899 if (isipv6) { 1900 bcopy((caddr_t)ip6, mtod(n, caddr_t), 1901 sizeof(struct ip6_hdr)); 1902 ip6 = mtod(n, struct ip6_hdr *); 1903 xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr); 1904 nth = (struct tcphdr *)(ip6 + 1); 1905 if (port) { 1906 /* Insert a UDP header */ 1907 uh = (struct udphdr *)nth; 1908 uh->uh_sport = htons(V_tcp_udp_tunneling_port); 1909 uh->uh_dport = port; 1910 nth = (struct tcphdr *)(uh + 1); 1911 } 1912 } else 1913 #endif /* INET6 */ 1914 { 1915 bcopy((caddr_t)ip, mtod(n, caddr_t), sizeof(struct ip)); 1916 ip = mtod(n, struct ip *); 1917 xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t); 1918 nth = (struct tcphdr *)(ip + 1); 1919 if (port) { 1920 /* Insert a UDP header */ 1921 uh = (struct udphdr *)nth; 1922 uh->uh_sport = htons(V_tcp_udp_tunneling_port); 1923 uh->uh_dport = port; 1924 nth = (struct tcphdr *)(uh + 1); 1925 } 1926 } 1927 bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr)); 1928 xchg(nth->th_dport, nth->th_sport, uint16_t); 1929 th = nth; 1930 m_freem(m); 1931 m = n; 1932 } else { 1933 /* 1934 * reuse the mbuf. 1935 * XXX MRT We inherit the FIB, which is lucky. 1936 */ 1937 m_freem(m->m_next); 1938 m->m_next = NULL; 1939 m->m_data = (caddr_t)ipgen; 1940 /* clear any receive flags for proper bpf timestamping */ 1941 m->m_flags &= ~(M_TSTMP | M_TSTMP_LRO); 1942 /* m_len is set later */ 1943 #ifdef INET6 1944 if (isipv6) { 1945 xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr); 1946 nth = (struct tcphdr *)(ip6 + 1); 1947 } else 1948 #endif /* INET6 */ 1949 { 1950 xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, uint32_t); 1951 nth = (struct tcphdr *)(ip + 1); 1952 } 1953 if (th != nth) { 1954 /* 1955 * this is usually a case when an extension header 1956 * exists between the IPv6 header and the 1957 * TCP header. 1958 */ 1959 nth->th_sport = th->th_sport; 1960 nth->th_dport = th->th_dport; 1961 } 1962 xchg(nth->th_dport, nth->th_sport, uint16_t); 1963 #undef xchg 1964 } 1965 tlen = 0; 1966 #ifdef INET6 1967 if (isipv6) 1968 tlen = sizeof (struct ip6_hdr) + sizeof (struct tcphdr); 1969 #endif 1970 #if defined(INET) && defined(INET6) 1971 else 1972 #endif 1973 #ifdef INET 1974 tlen = sizeof (struct tcpiphdr); 1975 #endif 1976 if (port) 1977 tlen += sizeof (struct udphdr); 1978 #ifdef INVARIANTS 1979 m->m_len = 0; 1980 KASSERT(M_TRAILINGSPACE(m) >= tlen, 1981 ("Not enough trailing space for message (m=%p, need=%d, have=%ld)", 1982 m, tlen, (long)M_TRAILINGSPACE(m))); 1983 #endif 1984 m->m_len = tlen; 1985 to.to_flags = 0; 1986 if (incl_opts) { 1987 ect = tcp_ecn_output_established(tp, &flags, 0, false); 1988 /* Make sure we have room. */ 1989 if (M_TRAILINGSPACE(m) < TCP_MAXOLEN) { 1990 m->m_next = m_get(M_NOWAIT, MT_DATA); 1991 if (m->m_next) { 1992 optp = mtod(m->m_next, u_char *); 1993 optm = m->m_next; 1994 } else 1995 incl_opts = false; 1996 } else { 1997 optp = (u_char *) (nth + 1); 1998 optm = m; 1999 } 2000 } 2001 if (incl_opts) { 2002 /* Timestamps. */ 2003 if (tp->t_flags & TF_RCVD_TSTMP) { 2004 to.to_tsval = tcp_ts_getticks() + tp->ts_offset; 2005 to.to_tsecr = tp->ts_recent; 2006 to.to_flags |= TOF_TS; 2007 } 2008 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2009 /* TCP-MD5 (RFC2385). */ 2010 if (tp->t_flags & TF_SIGNATURE) 2011 to.to_flags |= TOF_SIGNATURE; 2012 #endif 2013 /* Add the options. */ 2014 tlen += optlen = tcp_addoptions(&to, optp); 2015 2016 /* Update m_len in the correct mbuf. */ 2017 optm->m_len += optlen; 2018 } else 2019 optlen = 0; 2020 #ifdef INET6 2021 if (isipv6) { 2022 if (uh) { 2023 ulen = tlen - sizeof(struct ip6_hdr); 2024 uh->uh_ulen = htons(ulen); 2025 } 2026 ip6->ip6_flow = htonl(ect << IPV6_FLOWLABEL_LEN); 2027 ip6->ip6_vfc = IPV6_VERSION; 2028 if (port) 2029 ip6->ip6_nxt = IPPROTO_UDP; 2030 else 2031 ip6->ip6_nxt = IPPROTO_TCP; 2032 ip6->ip6_plen = htons(tlen - sizeof(*ip6)); 2033 } 2034 #endif 2035 #if defined(INET) && defined(INET6) 2036 else 2037 #endif 2038 #ifdef INET 2039 { 2040 if (uh) { 2041 ulen = tlen - sizeof(struct ip); 2042 uh->uh_ulen = htons(ulen); 2043 } 2044 ip->ip_len = htons(tlen); 2045 if (inp != NULL) { 2046 ip->ip_tos = inp->inp_ip_tos & ~IPTOS_ECN_MASK; 2047 ip->ip_ttl = inp->inp_ip_ttl; 2048 } else { 2049 ip->ip_tos = 0; 2050 ip->ip_ttl = V_ip_defttl; 2051 } 2052 ip->ip_tos |= ect; 2053 if (port) { 2054 ip->ip_p = IPPROTO_UDP; 2055 } else { 2056 ip->ip_p = IPPROTO_TCP; 2057 } 2058 if (V_path_mtu_discovery) 2059 ip->ip_off |= htons(IP_DF); 2060 } 2061 #endif 2062 m->m_pkthdr.len = tlen; 2063 m->m_pkthdr.rcvif = NULL; 2064 #ifdef MAC 2065 if (inp != NULL) { 2066 /* 2067 * Packet is associated with a socket, so allow the 2068 * label of the response to reflect the socket label. 2069 */ 2070 INP_LOCK_ASSERT(inp); 2071 mac_inpcb_create_mbuf(inp, m); 2072 } else { 2073 /* 2074 * Packet is not associated with a socket, so possibly 2075 * update the label in place. 2076 */ 2077 mac_netinet_tcp_reply(m); 2078 } 2079 #endif 2080 nth->th_seq = htonl(seq); 2081 nth->th_ack = htonl(ack); 2082 nth->th_off = (sizeof (struct tcphdr) + optlen) >> 2; 2083 tcp_set_flags(nth, flags); 2084 if (tp && (flags & TH_RST)) { 2085 /* Log the reset */ 2086 tcp_log_end_status(tp, TCP_EI_STATUS_SERVER_RST); 2087 } 2088 if (tp != NULL) 2089 nth->th_win = htons((u_short) (win >> tp->rcv_scale)); 2090 else 2091 nth->th_win = htons((u_short)win); 2092 nth->th_urp = 0; 2093 2094 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 2095 if (to.to_flags & TOF_SIGNATURE) { 2096 if (!TCPMD5_ENABLED() || 2097 TCPMD5_OUTPUT(m, nth, to.to_signature) != 0) { 2098 m_freem(m); 2099 return; 2100 } 2101 } 2102 #endif 2103 2104 #ifdef INET6 2105 if (isipv6) { 2106 if (port) { 2107 m->m_pkthdr.csum_flags = CSUM_UDP_IPV6; 2108 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 2109 uh->uh_sum = in6_cksum_pseudo(ip6, ulen, IPPROTO_UDP, 0); 2110 nth->th_sum = 0; 2111 } else { 2112 m->m_pkthdr.csum_flags = CSUM_TCP_IPV6; 2113 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); 2114 nth->th_sum = in6_cksum_pseudo(ip6, 2115 tlen - sizeof(struct ip6_hdr), IPPROTO_TCP, 0); 2116 } 2117 ip6->ip6_hlim = in6_selecthlim(inp, NULL); 2118 } 2119 #endif /* INET6 */ 2120 #if defined(INET6) && defined(INET) 2121 else 2122 #endif 2123 #ifdef INET 2124 { 2125 if (port) { 2126 uh->uh_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, 2127 htons(ulen + IPPROTO_UDP)); 2128 m->m_pkthdr.csum_flags = CSUM_UDP; 2129 m->m_pkthdr.csum_data = offsetof(struct udphdr, uh_sum); 2130 nth->th_sum = 0; 2131 } else { 2132 m->m_pkthdr.csum_flags = CSUM_TCP; 2133 m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum); 2134 nth->th_sum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr, 2135 htons((u_short)(tlen - sizeof(struct ip) + ip->ip_p))); 2136 } 2137 } 2138 #endif /* INET */ 2139 TCP_PROBE3(debug__output, tp, th, m); 2140 if (flags & TH_RST) 2141 TCP_PROBE5(accept__refused, NULL, NULL, m, tp, nth); 2142 lgb = NULL; 2143 if ((tp != NULL) && tcp_bblogging_on(tp)) { 2144 if (INP_WLOCKED(inp)) { 2145 union tcp_log_stackspecific log; 2146 struct timeval tv; 2147 2148 memset(&log.u_bbr, 0, sizeof(log.u_bbr)); 2149 log.u_bbr.inhpts = tcp_in_hpts(tp); 2150 log.u_bbr.flex8 = 4; 2151 log.u_bbr.pkts_out = tp->t_maxseg; 2152 log.u_bbr.timeStamp = tcp_get_usecs(&tv); 2153 log.u_bbr.delivered = 0; 2154 lgb = tcp_log_event(tp, nth, NULL, NULL, TCP_LOG_OUT, 2155 ERRNO_UNK, 0, &log, false, NULL, NULL, 0, &tv); 2156 } else { 2157 /* 2158 * We can not log the packet, since we only own the 2159 * read lock, but a write lock is needed. The read lock 2160 * is not upgraded to a write lock, since only getting 2161 * the read lock was done intentionally to improve the 2162 * handling of SYN flooding attacks. 2163 * This happens only for pure SYN segments received in 2164 * the initial CLOSED state, or received in a more 2165 * advanced state than listen and the UDP encapsulation 2166 * port is unexpected. 2167 * The incoming SYN segments do not really belong to 2168 * the TCP connection and the handling does not change 2169 * the state of the TCP connection. Therefore, the 2170 * sending of the RST segments is not logged. Please 2171 * note that also the incoming SYN segments are not 2172 * logged. 2173 * 2174 * The following code ensures that the above description 2175 * is and stays correct. 2176 */ 2177 KASSERT((thflags & (TH_ACK|TH_SYN)) == TH_SYN && 2178 (tp->t_state == TCPS_CLOSED || 2179 (tp->t_state > TCPS_LISTEN && tp->t_port != port)), 2180 ("%s: Logging of TCP segment with flags 0x%b and " 2181 "UDP encapsulation port %u skipped in state %s", 2182 __func__, thflags, PRINT_TH_FLAGS, 2183 ntohs(port), tcpstates[tp->t_state])); 2184 } 2185 } 2186 2187 if (flags & TH_ACK) 2188 TCPSTAT_INC(tcps_sndacks); 2189 else if (flags & (TH_SYN|TH_FIN|TH_RST)) 2190 TCPSTAT_INC(tcps_sndctrl); 2191 TCPSTAT_INC(tcps_sndtotal); 2192 2193 #ifdef INET6 2194 if (isipv6) { 2195 TCP_PROBE5(send, NULL, tp, ip6, tp, nth); 2196 output_ret = ip6_output(m, inp ? inp->in6p_outputopts : NULL, 2197 NULL, 0, NULL, NULL, inp); 2198 } 2199 #endif /* INET6 */ 2200 #if defined(INET) && defined(INET6) 2201 else 2202 #endif 2203 #ifdef INET 2204 { 2205 TCP_PROBE5(send, NULL, tp, ip, tp, nth); 2206 output_ret = ip_output(m, NULL, NULL, 0, NULL, inp); 2207 } 2208 #endif 2209 if (lgb != NULL) 2210 lgb->tlb_errno = output_ret; 2211 } 2212 2213 /* 2214 * Create a new TCP control block, making an empty reassembly queue and hooking 2215 * it to the argument protocol control block. The `inp' parameter must have 2216 * come from the zone allocator set up by tcpcbstor declaration. 2217 */ 2218 struct tcpcb * 2219 tcp_newtcpcb(struct inpcb *inp) 2220 { 2221 struct tcpcb *tp = intotcpcb(inp); 2222 #ifdef INET6 2223 int isipv6 = (inp->inp_vflag & INP_IPV6) != 0; 2224 #endif /* INET6 */ 2225 2226 /* 2227 * Historically allocation was done with M_ZERO. There is a lot of 2228 * code that rely on that. For now take safe approach and zero whole 2229 * tcpcb. This definitely can be optimized. 2230 */ 2231 bzero(&tp->t_start_zero, t_zero_size); 2232 2233 /* Initialise cc_var struct for this tcpcb. */ 2234 tp->t_ccv.type = IPPROTO_TCP; 2235 tp->t_ccv.ccvc.tcp = tp; 2236 rw_rlock(&tcp_function_lock); 2237 tp->t_fb = V_tcp_func_set_ptr; 2238 refcount_acquire(&tp->t_fb->tfb_refcnt); 2239 rw_runlock(&tcp_function_lock); 2240 /* 2241 * Use the current system default CC algorithm. 2242 */ 2243 cc_attach(tp, CC_DEFAULT_ALGO()); 2244 2245 if (CC_ALGO(tp)->cb_init != NULL) 2246 if (CC_ALGO(tp)->cb_init(&tp->t_ccv, NULL) > 0) { 2247 cc_detach(tp); 2248 if (tp->t_fb->tfb_tcp_fb_fini) 2249 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1); 2250 refcount_release(&tp->t_fb->tfb_refcnt); 2251 return (NULL); 2252 } 2253 2254 #ifdef TCP_HHOOK 2255 if (khelp_init_osd(HELPER_CLASS_TCP, &tp->t_osd)) { 2256 if (tp->t_fb->tfb_tcp_fb_fini) 2257 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1); 2258 refcount_release(&tp->t_fb->tfb_refcnt); 2259 return (NULL); 2260 } 2261 #endif 2262 2263 TAILQ_INIT(&tp->t_segq); 2264 STAILQ_INIT(&tp->t_inqueue); 2265 tp->t_maxseg = 2266 #ifdef INET6 2267 isipv6 ? V_tcp_v6mssdflt : 2268 #endif /* INET6 */ 2269 V_tcp_mssdflt; 2270 2271 /* All mbuf queue/ack compress flags should be off */ 2272 tcp_lro_features_off(tp); 2273 2274 callout_init_rw(&tp->t_callout, &inp->inp_lock, CALLOUT_RETURNUNLOCKED); 2275 for (int i = 0; i < TT_N; i++) 2276 tp->t_timers[i] = SBT_MAX; 2277 2278 switch (V_tcp_do_rfc1323) { 2279 case 0: 2280 break; 2281 default: 2282 case 1: 2283 tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP); 2284 break; 2285 case 2: 2286 tp->t_flags = TF_REQ_SCALE; 2287 break; 2288 case 3: 2289 tp->t_flags = TF_REQ_TSTMP; 2290 break; 2291 } 2292 if (V_tcp_do_sack) 2293 tp->t_flags |= TF_SACK_PERMIT; 2294 TAILQ_INIT(&tp->snd_holes); 2295 2296 /* 2297 * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no 2298 * rtt estimate. Set rttvar so that srtt + 4 * rttvar gives 2299 * reasonable initial retransmit time. 2300 */ 2301 tp->t_srtt = TCPTV_SRTTBASE; 2302 tp->t_rttvar = ((tcp_rexmit_initial - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4; 2303 tp->t_rttmin = tcp_rexmit_min; 2304 tp->t_rxtcur = tcp_rexmit_initial; 2305 tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT; 2306 tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT; 2307 tp->t_rcvtime = ticks; 2308 /* We always start with ticks granularity */ 2309 tp->t_tmr_granularity = TCP_TMR_GRANULARITY_TICKS; 2310 /* 2311 * IPv4 TTL initialization is necessary for an IPv6 socket as well, 2312 * because the socket may be bound to an IPv6 wildcard address, 2313 * which may match an IPv4-mapped IPv6 address. 2314 */ 2315 inp->inp_ip_ttl = V_ip_defttl; 2316 #ifdef TCPPCAP 2317 /* 2318 * Init the TCP PCAP queues. 2319 */ 2320 tcp_pcap_tcpcb_init(tp); 2321 #endif 2322 #ifdef TCP_BLACKBOX 2323 /* Initialize the per-TCPCB log data. */ 2324 tcp_log_tcpcbinit(tp); 2325 #endif 2326 tp->t_pacing_rate = -1; 2327 if (tp->t_fb->tfb_tcp_fb_init) { 2328 if ((*tp->t_fb->tfb_tcp_fb_init)(tp, &tp->t_fb_ptr)) { 2329 refcount_release(&tp->t_fb->tfb_refcnt); 2330 return (NULL); 2331 } 2332 } 2333 #ifdef STATS 2334 if (V_tcp_perconn_stats_enable == 1) 2335 tp->t_stats = stats_blob_alloc(V_tcp_perconn_stats_dflt_tpl, 0); 2336 #endif 2337 if (V_tcp_do_lrd) 2338 tp->t_flags |= TF_LRD; 2339 2340 return (tp); 2341 } 2342 2343 /* 2344 * Drop a TCP connection, reporting 2345 * the specified error. If connection is synchronized, 2346 * then send a RST to peer. 2347 */ 2348 struct tcpcb * 2349 tcp_drop(struct tcpcb *tp, int errno) 2350 { 2351 struct socket *so = tptosocket(tp); 2352 2353 NET_EPOCH_ASSERT(); 2354 INP_WLOCK_ASSERT(tptoinpcb(tp)); 2355 2356 if (TCPS_HAVERCVDSYN(tp->t_state)) { 2357 tcp_state_change(tp, TCPS_CLOSED); 2358 /* Don't use tcp_output() here due to possible recursion. */ 2359 (void)tcp_output_nodrop(tp); 2360 TCPSTAT_INC(tcps_drops); 2361 } else 2362 TCPSTAT_INC(tcps_conndrops); 2363 if (errno == ETIMEDOUT && tp->t_softerror) 2364 errno = tp->t_softerror; 2365 so->so_error = errno; 2366 return (tcp_close(tp)); 2367 } 2368 2369 void 2370 tcp_discardcb(struct tcpcb *tp) 2371 { 2372 struct inpcb *inp = tptoinpcb(tp); 2373 struct socket *so = tptosocket(tp); 2374 struct mbuf *m; 2375 #ifdef INET6 2376 bool isipv6 = (inp->inp_vflag & INP_IPV6) != 0; 2377 #endif 2378 2379 INP_WLOCK_ASSERT(inp); 2380 2381 tcp_timer_stop(tp); 2382 2383 /* free the reassembly queue, if any */ 2384 tcp_reass_flush(tp); 2385 2386 #ifdef TCP_OFFLOAD 2387 /* Disconnect offload device, if any. */ 2388 if (tp->t_flags & TF_TOE) 2389 tcp_offload_detach(tp); 2390 #endif 2391 2392 tcp_free_sackholes(tp); 2393 2394 #ifdef TCPPCAP 2395 /* Free the TCP PCAP queues. */ 2396 tcp_pcap_drain(&(tp->t_inpkts)); 2397 tcp_pcap_drain(&(tp->t_outpkts)); 2398 #endif 2399 2400 /* Allow the CC algorithm to clean up after itself. */ 2401 if (CC_ALGO(tp)->cb_destroy != NULL) 2402 CC_ALGO(tp)->cb_destroy(&tp->t_ccv); 2403 CC_DATA(tp) = NULL; 2404 /* Detach from the CC algorithm */ 2405 cc_detach(tp); 2406 2407 #ifdef TCP_HHOOK 2408 khelp_destroy_osd(&tp->t_osd); 2409 #endif 2410 #ifdef STATS 2411 stats_blob_destroy(tp->t_stats); 2412 #endif 2413 2414 CC_ALGO(tp) = NULL; 2415 if ((m = STAILQ_FIRST(&tp->t_inqueue)) != NULL) { 2416 struct mbuf *prev; 2417 2418 STAILQ_INIT(&tp->t_inqueue); 2419 STAILQ_FOREACH_FROM_SAFE(m, &tp->t_inqueue, m_stailqpkt, prev) 2420 m_freem(m); 2421 } 2422 TCPSTATES_DEC(tp->t_state); 2423 2424 if (tp->t_fb->tfb_tcp_fb_fini) 2425 (*tp->t_fb->tfb_tcp_fb_fini)(tp, 1); 2426 MPASS(!tcp_in_hpts(tp)); 2427 #ifdef TCP_BLACKBOX 2428 tcp_log_tcpcbfini(tp); 2429 #endif 2430 2431 /* 2432 * If we got enough samples through the srtt filter, 2433 * save the rtt and rttvar in the routing entry. 2434 * 'Enough' is arbitrarily defined as 4 rtt samples. 2435 * 4 samples is enough for the srtt filter to converge 2436 * to within enough % of the correct value; fewer samples 2437 * and we could save a bogus rtt. The danger is not high 2438 * as tcp quickly recovers from everything. 2439 * XXX: Works very well but needs some more statistics! 2440 * 2441 * XXXRRS: Updating must be after the stack fini() since 2442 * that may be converting some internal representation of 2443 * say srtt etc into the general one used by other stacks. 2444 * Lets also at least protect against the so being NULL 2445 * as RW stated below. 2446 */ 2447 if ((tp->t_rttupdated >= 4) && (so != NULL)) { 2448 struct hc_metrics_lite metrics; 2449 uint32_t ssthresh; 2450 2451 bzero(&metrics, sizeof(metrics)); 2452 /* 2453 * Update the ssthresh always when the conditions below 2454 * are satisfied. This gives us better new start value 2455 * for the congestion avoidance for new connections. 2456 * ssthresh is only set if packet loss occurred on a session. 2457 * 2458 * XXXRW: 'so' may be NULL here, and/or socket buffer may be 2459 * being torn down. Ideally this code would not use 'so'. 2460 */ 2461 ssthresh = tp->snd_ssthresh; 2462 if (ssthresh != 0 && ssthresh < so->so_snd.sb_hiwat / 2) { 2463 /* 2464 * convert the limit from user data bytes to 2465 * packets then to packet data bytes. 2466 */ 2467 ssthresh = (ssthresh + tp->t_maxseg / 2) / tp->t_maxseg; 2468 if (ssthresh < 2) 2469 ssthresh = 2; 2470 ssthresh *= (tp->t_maxseg + 2471 #ifdef INET6 2472 (isipv6 ? sizeof (struct ip6_hdr) + 2473 sizeof (struct tcphdr) : 2474 #endif 2475 sizeof (struct tcpiphdr) 2476 #ifdef INET6 2477 ) 2478 #endif 2479 ); 2480 } else 2481 ssthresh = 0; 2482 metrics.rmx_ssthresh = ssthresh; 2483 2484 metrics.rmx_rtt = tp->t_srtt; 2485 metrics.rmx_rttvar = tp->t_rttvar; 2486 metrics.rmx_cwnd = tp->snd_cwnd; 2487 metrics.rmx_sendpipe = 0; 2488 metrics.rmx_recvpipe = 0; 2489 2490 tcp_hc_update(&inp->inp_inc, &metrics); 2491 } 2492 2493 refcount_release(&tp->t_fb->tfb_refcnt); 2494 } 2495 2496 /* 2497 * Attempt to close a TCP control block, marking it as dropped, and freeing 2498 * the socket if we hold the only reference. 2499 */ 2500 struct tcpcb * 2501 tcp_close(struct tcpcb *tp) 2502 { 2503 struct inpcb *inp = tptoinpcb(tp); 2504 struct socket *so = tptosocket(tp); 2505 2506 INP_WLOCK_ASSERT(inp); 2507 2508 #ifdef TCP_OFFLOAD 2509 if (tp->t_state == TCPS_LISTEN) 2510 tcp_offload_listen_stop(tp); 2511 #endif 2512 /* 2513 * This releases the TFO pending counter resource for TFO listen 2514 * sockets as well as passively-created TFO sockets that transition 2515 * from SYN_RECEIVED to CLOSED. 2516 */ 2517 if (tp->t_tfo_pending) { 2518 tcp_fastopen_decrement_counter(tp->t_tfo_pending); 2519 tp->t_tfo_pending = NULL; 2520 } 2521 if (tp->t_fb->tfb_tcp_timer_stop_all != NULL) 2522 tp->t_fb->tfb_tcp_timer_stop_all(tp); 2523 in_pcbdrop(inp); 2524 TCPSTAT_INC(tcps_closed); 2525 if (tp->t_state != TCPS_CLOSED) 2526 tcp_state_change(tp, TCPS_CLOSED); 2527 KASSERT(inp->inp_socket != NULL, ("tcp_close: inp_socket NULL")); 2528 soisdisconnected(so); 2529 if (inp->inp_flags & INP_SOCKREF) { 2530 inp->inp_flags &= ~INP_SOCKREF; 2531 INP_WUNLOCK(inp); 2532 sorele(so); 2533 return (NULL); 2534 } 2535 return (tp); 2536 } 2537 2538 /* 2539 * Notify a tcp user of an asynchronous error; 2540 * store error as soft error, but wake up user 2541 * (for now, won't do anything until can select for soft error). 2542 * 2543 * Do not wake up user since there currently is no mechanism for 2544 * reporting soft errors (yet - a kqueue filter may be added). 2545 */ 2546 static struct inpcb * 2547 tcp_notify(struct inpcb *inp, int error) 2548 { 2549 struct tcpcb *tp; 2550 2551 INP_WLOCK_ASSERT(inp); 2552 2553 tp = intotcpcb(inp); 2554 KASSERT(tp != NULL, ("tcp_notify: tp == NULL")); 2555 2556 /* 2557 * Ignore some errors if we are hooked up. 2558 * If connection hasn't completed, has retransmitted several times, 2559 * and receives a second error, give up now. This is better 2560 * than waiting a long time to establish a connection that 2561 * can never complete. 2562 */ 2563 if (tp->t_state == TCPS_ESTABLISHED && 2564 (error == EHOSTUNREACH || error == ENETUNREACH || 2565 error == EHOSTDOWN)) { 2566 if (inp->inp_route.ro_nh) { 2567 NH_FREE(inp->inp_route.ro_nh); 2568 inp->inp_route.ro_nh = (struct nhop_object *)NULL; 2569 } 2570 return (inp); 2571 } else if (tp->t_state < TCPS_ESTABLISHED && tp->t_rxtshift > 3 && 2572 tp->t_softerror) { 2573 tp = tcp_drop(tp, error); 2574 if (tp != NULL) 2575 return (inp); 2576 else 2577 return (NULL); 2578 } else { 2579 tp->t_softerror = error; 2580 return (inp); 2581 } 2582 #if 0 2583 wakeup( &so->so_timeo); 2584 sorwakeup(so); 2585 sowwakeup(so); 2586 #endif 2587 } 2588 2589 static int 2590 tcp_pcblist(SYSCTL_HANDLER_ARGS) 2591 { 2592 struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_tcbinfo, 2593 INPLOOKUP_RLOCKPCB); 2594 struct xinpgen xig; 2595 struct inpcb *inp; 2596 int error; 2597 2598 if (req->newptr != NULL) 2599 return (EPERM); 2600 2601 if (req->oldptr == NULL) { 2602 int n; 2603 2604 n = V_tcbinfo.ipi_count + 2605 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]); 2606 n += imax(n / 8, 10); 2607 req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xtcpcb); 2608 return (0); 2609 } 2610 2611 if ((error = sysctl_wire_old_buffer(req, 0)) != 0) 2612 return (error); 2613 2614 bzero(&xig, sizeof(xig)); 2615 xig.xig_len = sizeof xig; 2616 xig.xig_count = V_tcbinfo.ipi_count + 2617 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]); 2618 xig.xig_gen = V_tcbinfo.ipi_gencnt; 2619 xig.xig_sogen = so_gencnt; 2620 error = SYSCTL_OUT(req, &xig, sizeof xig); 2621 if (error) 2622 return (error); 2623 2624 error = syncache_pcblist(req); 2625 if (error) 2626 return (error); 2627 2628 while ((inp = inp_next(&inpi)) != NULL) { 2629 if (inp->inp_gencnt <= xig.xig_gen && 2630 cr_canseeinpcb(req->td->td_ucred, inp) == 0) { 2631 struct xtcpcb xt; 2632 2633 tcp_inptoxtp(inp, &xt); 2634 error = SYSCTL_OUT(req, &xt, sizeof xt); 2635 if (error) { 2636 INP_RUNLOCK(inp); 2637 break; 2638 } else 2639 continue; 2640 } 2641 } 2642 2643 if (!error) { 2644 /* 2645 * Give the user an updated idea of our state. 2646 * If the generation differs from what we told 2647 * her before, she knows that something happened 2648 * while we were processing this request, and it 2649 * might be necessary to retry. 2650 */ 2651 xig.xig_gen = V_tcbinfo.ipi_gencnt; 2652 xig.xig_sogen = so_gencnt; 2653 xig.xig_count = V_tcbinfo.ipi_count + 2654 counter_u64_fetch(V_tcps_states[TCPS_SYN_RECEIVED]); 2655 error = SYSCTL_OUT(req, &xig, sizeof xig); 2656 } 2657 2658 return (error); 2659 } 2660 2661 SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist, 2662 CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_NEEDGIANT, 2663 NULL, 0, tcp_pcblist, "S,xtcpcb", 2664 "List of active TCP connections"); 2665 2666 #ifdef INET 2667 static int 2668 tcp_getcred(SYSCTL_HANDLER_ARGS) 2669 { 2670 struct xucred xuc; 2671 struct sockaddr_in addrs[2]; 2672 struct epoch_tracker et; 2673 struct inpcb *inp; 2674 int error; 2675 2676 error = priv_check(req->td, PRIV_NETINET_GETCRED); 2677 if (error) 2678 return (error); 2679 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 2680 if (error) 2681 return (error); 2682 NET_EPOCH_ENTER(et); 2683 inp = in_pcblookup(&V_tcbinfo, addrs[1].sin_addr, addrs[1].sin_port, 2684 addrs[0].sin_addr, addrs[0].sin_port, INPLOOKUP_RLOCKPCB, NULL); 2685 NET_EPOCH_EXIT(et); 2686 if (inp != NULL) { 2687 if (error == 0) 2688 error = cr_canseeinpcb(req->td->td_ucred, inp); 2689 if (error == 0) 2690 cru2x(inp->inp_cred, &xuc); 2691 INP_RUNLOCK(inp); 2692 } else 2693 error = ENOENT; 2694 if (error == 0) 2695 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 2696 return (error); 2697 } 2698 2699 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, getcred, 2700 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NEEDGIANT, 2701 0, 0, tcp_getcred, "S,xucred", 2702 "Get the xucred of a TCP connection"); 2703 #endif /* INET */ 2704 2705 #ifdef INET6 2706 static int 2707 tcp6_getcred(SYSCTL_HANDLER_ARGS) 2708 { 2709 struct epoch_tracker et; 2710 struct xucred xuc; 2711 struct sockaddr_in6 addrs[2]; 2712 struct inpcb *inp; 2713 int error; 2714 #ifdef INET 2715 int mapped = 0; 2716 #endif 2717 2718 error = priv_check(req->td, PRIV_NETINET_GETCRED); 2719 if (error) 2720 return (error); 2721 error = SYSCTL_IN(req, addrs, sizeof(addrs)); 2722 if (error) 2723 return (error); 2724 if ((error = sa6_embedscope(&addrs[0], V_ip6_use_defzone)) != 0 || 2725 (error = sa6_embedscope(&addrs[1], V_ip6_use_defzone)) != 0) { 2726 return (error); 2727 } 2728 if (IN6_IS_ADDR_V4MAPPED(&addrs[0].sin6_addr)) { 2729 #ifdef INET 2730 if (IN6_IS_ADDR_V4MAPPED(&addrs[1].sin6_addr)) 2731 mapped = 1; 2732 else 2733 #endif 2734 return (EINVAL); 2735 } 2736 2737 NET_EPOCH_ENTER(et); 2738 #ifdef INET 2739 if (mapped == 1) 2740 inp = in_pcblookup(&V_tcbinfo, 2741 *(struct in_addr *)&addrs[1].sin6_addr.s6_addr[12], 2742 addrs[1].sin6_port, 2743 *(struct in_addr *)&addrs[0].sin6_addr.s6_addr[12], 2744 addrs[0].sin6_port, INPLOOKUP_RLOCKPCB, NULL); 2745 else 2746 #endif 2747 inp = in6_pcblookup(&V_tcbinfo, 2748 &addrs[1].sin6_addr, addrs[1].sin6_port, 2749 &addrs[0].sin6_addr, addrs[0].sin6_port, 2750 INPLOOKUP_RLOCKPCB, NULL); 2751 NET_EPOCH_EXIT(et); 2752 if (inp != NULL) { 2753 if (error == 0) 2754 error = cr_canseeinpcb(req->td->td_ucred, inp); 2755 if (error == 0) 2756 cru2x(inp->inp_cred, &xuc); 2757 INP_RUNLOCK(inp); 2758 } else 2759 error = ENOENT; 2760 if (error == 0) 2761 error = SYSCTL_OUT(req, &xuc, sizeof(struct xucred)); 2762 return (error); 2763 } 2764 2765 SYSCTL_PROC(_net_inet6_tcp6, OID_AUTO, getcred, 2766 CTLTYPE_OPAQUE | CTLFLAG_RW | CTLFLAG_PRISON | CTLFLAG_NEEDGIANT, 2767 0, 0, tcp6_getcred, "S,xucred", 2768 "Get the xucred of a TCP6 connection"); 2769 #endif /* INET6 */ 2770 2771 #ifdef INET 2772 /* Path MTU to try next when a fragmentation-needed message is received. */ 2773 static inline int 2774 tcp_next_pmtu(const struct icmp *icp, const struct ip *ip) 2775 { 2776 int mtu = ntohs(icp->icmp_nextmtu); 2777 2778 /* If no alternative MTU was proposed, try the next smaller one. */ 2779 if (!mtu) 2780 mtu = ip_next_mtu(ntohs(ip->ip_len), 1); 2781 if (mtu < V_tcp_minmss + sizeof(struct tcpiphdr)) 2782 mtu = V_tcp_minmss + sizeof(struct tcpiphdr); 2783 2784 return (mtu); 2785 } 2786 2787 static void 2788 tcp_ctlinput_with_port(struct icmp *icp, uint16_t port) 2789 { 2790 struct ip *ip; 2791 struct tcphdr *th; 2792 struct inpcb *inp; 2793 struct tcpcb *tp; 2794 struct inpcb *(*notify)(struct inpcb *, int); 2795 struct in_conninfo inc; 2796 tcp_seq icmp_tcp_seq; 2797 int errno, mtu; 2798 2799 errno = icmp_errmap(icp); 2800 switch (errno) { 2801 case 0: 2802 return; 2803 case EMSGSIZE: 2804 notify = tcp_mtudisc_notify; 2805 break; 2806 case ECONNREFUSED: 2807 if (V_icmp_may_rst) 2808 notify = tcp_drop_syn_sent; 2809 else 2810 notify = tcp_notify; 2811 break; 2812 case EHOSTUNREACH: 2813 if (V_icmp_may_rst && icp->icmp_type == ICMP_TIMXCEED) 2814 notify = tcp_drop_syn_sent; 2815 else 2816 notify = tcp_notify; 2817 break; 2818 default: 2819 notify = tcp_notify; 2820 } 2821 2822 ip = &icp->icmp_ip; 2823 th = (struct tcphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 2824 icmp_tcp_seq = th->th_seq; 2825 inp = in_pcblookup(&V_tcbinfo, ip->ip_dst, th->th_dport, ip->ip_src, 2826 th->th_sport, INPLOOKUP_WLOCKPCB, NULL); 2827 if (inp != NULL) { 2828 tp = intotcpcb(inp); 2829 #ifdef TCP_OFFLOAD 2830 if (tp->t_flags & TF_TOE && errno == EMSGSIZE) { 2831 /* 2832 * MTU discovery for offloaded connections. Let 2833 * the TOE driver verify seq# and process it. 2834 */ 2835 mtu = tcp_next_pmtu(icp, ip); 2836 tcp_offload_pmtu_update(tp, icmp_tcp_seq, mtu); 2837 goto out; 2838 } 2839 #endif 2840 if (tp->t_port != port) 2841 goto out; 2842 if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) && 2843 SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) { 2844 if (errno == EMSGSIZE) { 2845 /* 2846 * MTU discovery: we got a needfrag and 2847 * will potentially try a lower MTU. 2848 */ 2849 mtu = tcp_next_pmtu(icp, ip); 2850 2851 /* 2852 * Only process the offered MTU if it 2853 * is smaller than the current one. 2854 */ 2855 if (mtu < tp->t_maxseg + 2856 sizeof(struct tcpiphdr)) { 2857 bzero(&inc, sizeof(inc)); 2858 inc.inc_faddr = ip->ip_dst; 2859 inc.inc_fibnum = 2860 inp->inp_inc.inc_fibnum; 2861 tcp_hc_updatemtu(&inc, mtu); 2862 inp = tcp_mtudisc(inp, mtu); 2863 } 2864 } else 2865 inp = (*notify)(inp, errno); 2866 } 2867 } else { 2868 bzero(&inc, sizeof(inc)); 2869 inc.inc_fport = th->th_dport; 2870 inc.inc_lport = th->th_sport; 2871 inc.inc_faddr = ip->ip_dst; 2872 inc.inc_laddr = ip->ip_src; 2873 syncache_unreach(&inc, icmp_tcp_seq, port); 2874 } 2875 out: 2876 if (inp != NULL) 2877 INP_WUNLOCK(inp); 2878 } 2879 2880 static void 2881 tcp_ctlinput(struct icmp *icmp) 2882 { 2883 tcp_ctlinput_with_port(icmp, htons(0)); 2884 } 2885 2886 static void 2887 tcp_ctlinput_viaudp(udp_tun_icmp_param_t param) 2888 { 2889 /* Its a tunneled TCP over UDP icmp */ 2890 struct icmp *icmp = param.icmp; 2891 struct ip *outer_ip, *inner_ip; 2892 struct udphdr *udp; 2893 struct tcphdr *th, ttemp; 2894 int i_hlen, o_len; 2895 uint16_t port; 2896 2897 outer_ip = (struct ip *)((caddr_t)icmp - sizeof(struct ip)); 2898 inner_ip = &icmp->icmp_ip; 2899 i_hlen = inner_ip->ip_hl << 2; 2900 o_len = ntohs(outer_ip->ip_len); 2901 if (o_len < 2902 (sizeof(struct ip) + 8 + i_hlen + sizeof(struct udphdr) + offsetof(struct tcphdr, th_ack))) { 2903 /* Not enough data present */ 2904 return; 2905 } 2906 /* Ok lets strip out the inner udphdr header by copying up on top of it the tcp hdr */ 2907 udp = (struct udphdr *)(((caddr_t)inner_ip) + i_hlen); 2908 if (ntohs(udp->uh_sport) != V_tcp_udp_tunneling_port) { 2909 return; 2910 } 2911 port = udp->uh_dport; 2912 th = (struct tcphdr *)(udp + 1); 2913 memcpy(&ttemp, th, sizeof(struct tcphdr)); 2914 memcpy(udp, &ttemp, sizeof(struct tcphdr)); 2915 /* Now adjust down the size of the outer IP header */ 2916 o_len -= sizeof(struct udphdr); 2917 outer_ip->ip_len = htons(o_len); 2918 /* Now call in to the normal handling code */ 2919 tcp_ctlinput_with_port(icmp, port); 2920 } 2921 #endif /* INET */ 2922 2923 #ifdef INET6 2924 static inline int 2925 tcp6_next_pmtu(const struct icmp6_hdr *icmp6) 2926 { 2927 int mtu = ntohl(icmp6->icmp6_mtu); 2928 2929 /* 2930 * If no alternative MTU was proposed, or the proposed MTU was too 2931 * small, set to the min. 2932 */ 2933 if (mtu < IPV6_MMTU) 2934 mtu = IPV6_MMTU - 8; /* XXXNP: what is the adjustment for? */ 2935 return (mtu); 2936 } 2937 2938 static void 2939 tcp6_ctlinput_with_port(struct ip6ctlparam *ip6cp, uint16_t port) 2940 { 2941 struct in6_addr *dst; 2942 struct inpcb *(*notify)(struct inpcb *, int); 2943 struct ip6_hdr *ip6; 2944 struct mbuf *m; 2945 struct inpcb *inp; 2946 struct tcpcb *tp; 2947 struct icmp6_hdr *icmp6; 2948 struct in_conninfo inc; 2949 struct tcp_ports { 2950 uint16_t th_sport; 2951 uint16_t th_dport; 2952 } t_ports; 2953 tcp_seq icmp_tcp_seq; 2954 unsigned int mtu; 2955 unsigned int off; 2956 int errno; 2957 2958 icmp6 = ip6cp->ip6c_icmp6; 2959 m = ip6cp->ip6c_m; 2960 ip6 = ip6cp->ip6c_ip6; 2961 off = ip6cp->ip6c_off; 2962 dst = &ip6cp->ip6c_finaldst->sin6_addr; 2963 2964 errno = icmp6_errmap(icmp6); 2965 switch (errno) { 2966 case 0: 2967 return; 2968 case EMSGSIZE: 2969 notify = tcp_mtudisc_notify; 2970 break; 2971 case ECONNREFUSED: 2972 if (V_icmp_may_rst) 2973 notify = tcp_drop_syn_sent; 2974 else 2975 notify = tcp_notify; 2976 break; 2977 case EHOSTUNREACH: 2978 /* 2979 * There are only four ICMPs that may reset connection: 2980 * - administratively prohibited 2981 * - port unreachable 2982 * - time exceeded in transit 2983 * - unknown next header 2984 */ 2985 if (V_icmp_may_rst && 2986 ((icmp6->icmp6_type == ICMP6_DST_UNREACH && 2987 (icmp6->icmp6_code == ICMP6_DST_UNREACH_ADMIN || 2988 icmp6->icmp6_code == ICMP6_DST_UNREACH_NOPORT)) || 2989 (icmp6->icmp6_type == ICMP6_TIME_EXCEEDED && 2990 icmp6->icmp6_code == ICMP6_TIME_EXCEED_TRANSIT) || 2991 (icmp6->icmp6_type == ICMP6_PARAM_PROB && 2992 icmp6->icmp6_code == ICMP6_PARAMPROB_NEXTHEADER))) 2993 notify = tcp_drop_syn_sent; 2994 else 2995 notify = tcp_notify; 2996 break; 2997 default: 2998 notify = tcp_notify; 2999 } 3000 3001 /* Check if we can safely get the ports from the tcp hdr */ 3002 if (m == NULL || 3003 (m->m_pkthdr.len < 3004 (int32_t) (off + sizeof(struct tcp_ports)))) { 3005 return; 3006 } 3007 bzero(&t_ports, sizeof(struct tcp_ports)); 3008 m_copydata(m, off, sizeof(struct tcp_ports), (caddr_t)&t_ports); 3009 inp = in6_pcblookup(&V_tcbinfo, &ip6->ip6_dst, t_ports.th_dport, 3010 &ip6->ip6_src, t_ports.th_sport, INPLOOKUP_WLOCKPCB, NULL); 3011 off += sizeof(struct tcp_ports); 3012 if (m->m_pkthdr.len < (int32_t) (off + sizeof(tcp_seq))) { 3013 goto out; 3014 } 3015 m_copydata(m, off, sizeof(tcp_seq), (caddr_t)&icmp_tcp_seq); 3016 if (inp != NULL) { 3017 tp = intotcpcb(inp); 3018 #ifdef TCP_OFFLOAD 3019 if (tp->t_flags & TF_TOE && errno == EMSGSIZE) { 3020 /* MTU discovery for offloaded connections. */ 3021 mtu = tcp6_next_pmtu(icmp6); 3022 tcp_offload_pmtu_update(tp, icmp_tcp_seq, mtu); 3023 goto out; 3024 } 3025 #endif 3026 if (tp->t_port != port) 3027 goto out; 3028 if (SEQ_GEQ(ntohl(icmp_tcp_seq), tp->snd_una) && 3029 SEQ_LT(ntohl(icmp_tcp_seq), tp->snd_max)) { 3030 if (errno == EMSGSIZE) { 3031 /* 3032 * MTU discovery: 3033 * If we got a needfrag set the MTU 3034 * in the route to the suggested new 3035 * value (if given) and then notify. 3036 */ 3037 mtu = tcp6_next_pmtu(icmp6); 3038 3039 bzero(&inc, sizeof(inc)); 3040 inc.inc_fibnum = M_GETFIB(m); 3041 inc.inc_flags |= INC_ISIPV6; 3042 inc.inc6_faddr = *dst; 3043 if (in6_setscope(&inc.inc6_faddr, 3044 m->m_pkthdr.rcvif, NULL)) 3045 goto out; 3046 /* 3047 * Only process the offered MTU if it 3048 * is smaller than the current one. 3049 */ 3050 if (mtu < tp->t_maxseg + 3051 sizeof (struct tcphdr) + 3052 sizeof (struct ip6_hdr)) { 3053 tcp_hc_updatemtu(&inc, mtu); 3054 tcp_mtudisc(inp, mtu); 3055 ICMP6STAT_INC(icp6s_pmtuchg); 3056 } 3057 } else 3058 inp = (*notify)(inp, errno); 3059 } 3060 } else { 3061 bzero(&inc, sizeof(inc)); 3062 inc.inc_fibnum = M_GETFIB(m); 3063 inc.inc_flags |= INC_ISIPV6; 3064 inc.inc_fport = t_ports.th_dport; 3065 inc.inc_lport = t_ports.th_sport; 3066 inc.inc6_faddr = *dst; 3067 inc.inc6_laddr = ip6->ip6_src; 3068 syncache_unreach(&inc, icmp_tcp_seq, port); 3069 } 3070 out: 3071 if (inp != NULL) 3072 INP_WUNLOCK(inp); 3073 } 3074 3075 static void 3076 tcp6_ctlinput(struct ip6ctlparam *ctl) 3077 { 3078 tcp6_ctlinput_with_port(ctl, htons(0)); 3079 } 3080 3081 static void 3082 tcp6_ctlinput_viaudp(udp_tun_icmp_param_t param) 3083 { 3084 struct ip6ctlparam *ip6cp = param.ip6cp; 3085 struct mbuf *m; 3086 struct udphdr *udp; 3087 uint16_t port; 3088 3089 m = m_pulldown(ip6cp->ip6c_m, ip6cp->ip6c_off, sizeof(struct udphdr), NULL); 3090 if (m == NULL) { 3091 return; 3092 } 3093 udp = mtod(m, struct udphdr *); 3094 if (ntohs(udp->uh_sport) != V_tcp_udp_tunneling_port) { 3095 return; 3096 } 3097 port = udp->uh_dport; 3098 m_adj(m, sizeof(struct udphdr)); 3099 if ((m->m_flags & M_PKTHDR) == 0) { 3100 ip6cp->ip6c_m->m_pkthdr.len -= sizeof(struct udphdr); 3101 } 3102 /* Now call in to the normal handling code */ 3103 tcp6_ctlinput_with_port(ip6cp, port); 3104 } 3105 3106 #endif /* INET6 */ 3107 3108 static uint32_t 3109 tcp_keyed_hash(struct in_conninfo *inc, u_char *key, u_int len) 3110 { 3111 SIPHASH_CTX ctx; 3112 uint32_t hash[2]; 3113 3114 KASSERT(len >= SIPHASH_KEY_LENGTH, 3115 ("%s: keylen %u too short ", __func__, len)); 3116 SipHash24_Init(&ctx); 3117 SipHash_SetKey(&ctx, (uint8_t *)key); 3118 SipHash_Update(&ctx, &inc->inc_fport, sizeof(uint16_t)); 3119 SipHash_Update(&ctx, &inc->inc_lport, sizeof(uint16_t)); 3120 switch (inc->inc_flags & INC_ISIPV6) { 3121 #ifdef INET 3122 case 0: 3123 SipHash_Update(&ctx, &inc->inc_faddr, sizeof(struct in_addr)); 3124 SipHash_Update(&ctx, &inc->inc_laddr, sizeof(struct in_addr)); 3125 break; 3126 #endif 3127 #ifdef INET6 3128 case INC_ISIPV6: 3129 SipHash_Update(&ctx, &inc->inc6_faddr, sizeof(struct in6_addr)); 3130 SipHash_Update(&ctx, &inc->inc6_laddr, sizeof(struct in6_addr)); 3131 break; 3132 #endif 3133 } 3134 SipHash_Final((uint8_t *)hash, &ctx); 3135 3136 return (hash[0] ^ hash[1]); 3137 } 3138 3139 uint32_t 3140 tcp_new_ts_offset(struct in_conninfo *inc) 3141 { 3142 struct in_conninfo inc_store, *local_inc; 3143 3144 if (!V_tcp_ts_offset_per_conn) { 3145 memcpy(&inc_store, inc, sizeof(struct in_conninfo)); 3146 inc_store.inc_lport = 0; 3147 inc_store.inc_fport = 0; 3148 local_inc = &inc_store; 3149 } else { 3150 local_inc = inc; 3151 } 3152 return (tcp_keyed_hash(local_inc, V_ts_offset_secret, 3153 sizeof(V_ts_offset_secret))); 3154 } 3155 3156 /* 3157 * Following is where TCP initial sequence number generation occurs. 3158 * 3159 * There are two places where we must use initial sequence numbers: 3160 * 1. In SYN-ACK packets. 3161 * 2. In SYN packets. 3162 * 3163 * All ISNs for SYN-ACK packets are generated by the syncache. See 3164 * tcp_syncache.c for details. 3165 * 3166 * The ISNs in SYN packets must be monotonic; TIME_WAIT recycling 3167 * depends on this property. In addition, these ISNs should be 3168 * unguessable so as to prevent connection hijacking. To satisfy 3169 * the requirements of this situation, the algorithm outlined in 3170 * RFC 1948 is used, with only small modifications. 3171 * 3172 * Implementation details: 3173 * 3174 * Time is based off the system timer, and is corrected so that it 3175 * increases by one megabyte per second. This allows for proper 3176 * recycling on high speed LANs while still leaving over an hour 3177 * before rollover. 3178 * 3179 * As reading the *exact* system time is too expensive to be done 3180 * whenever setting up a TCP connection, we increment the time 3181 * offset in two ways. First, a small random positive increment 3182 * is added to isn_offset for each connection that is set up. 3183 * Second, the function tcp_isn_tick fires once per clock tick 3184 * and increments isn_offset as necessary so that sequence numbers 3185 * are incremented at approximately ISN_BYTES_PER_SECOND. The 3186 * random positive increments serve only to ensure that the same 3187 * exact sequence number is never sent out twice (as could otherwise 3188 * happen when a port is recycled in less than the system tick 3189 * interval.) 3190 * 3191 * net.inet.tcp.isn_reseed_interval controls the number of seconds 3192 * between seeding of isn_secret. This is normally set to zero, 3193 * as reseeding should not be necessary. 3194 * 3195 * Locking of the global variables isn_secret, isn_last_reseed, isn_offset, 3196 * isn_offset_old, and isn_ctx is performed using the ISN lock. In 3197 * general, this means holding an exclusive (write) lock. 3198 */ 3199 3200 #define ISN_BYTES_PER_SECOND 1048576 3201 #define ISN_STATIC_INCREMENT 4096 3202 #define ISN_RANDOM_INCREMENT (4096 - 1) 3203 #define ISN_SECRET_LENGTH SIPHASH_KEY_LENGTH 3204 3205 VNET_DEFINE_STATIC(u_char, isn_secret[ISN_SECRET_LENGTH]); 3206 VNET_DEFINE_STATIC(int, isn_last); 3207 VNET_DEFINE_STATIC(int, isn_last_reseed); 3208 VNET_DEFINE_STATIC(u_int32_t, isn_offset); 3209 VNET_DEFINE_STATIC(u_int32_t, isn_offset_old); 3210 3211 #define V_isn_secret VNET(isn_secret) 3212 #define V_isn_last VNET(isn_last) 3213 #define V_isn_last_reseed VNET(isn_last_reseed) 3214 #define V_isn_offset VNET(isn_offset) 3215 #define V_isn_offset_old VNET(isn_offset_old) 3216 3217 tcp_seq 3218 tcp_new_isn(struct in_conninfo *inc) 3219 { 3220 tcp_seq new_isn; 3221 u_int32_t projected_offset; 3222 3223 ISN_LOCK(); 3224 /* Seed if this is the first use, reseed if requested. */ 3225 if ((V_isn_last_reseed == 0) || ((V_tcp_isn_reseed_interval > 0) && 3226 (((u_int)V_isn_last_reseed + (u_int)V_tcp_isn_reseed_interval*hz) 3227 < (u_int)ticks))) { 3228 arc4rand(&V_isn_secret, sizeof(V_isn_secret), 0); 3229 V_isn_last_reseed = ticks; 3230 } 3231 3232 /* Compute the hash and return the ISN. */ 3233 new_isn = (tcp_seq)tcp_keyed_hash(inc, V_isn_secret, 3234 sizeof(V_isn_secret)); 3235 V_isn_offset += ISN_STATIC_INCREMENT + 3236 (arc4random() & ISN_RANDOM_INCREMENT); 3237 if (ticks != V_isn_last) { 3238 projected_offset = V_isn_offset_old + 3239 ISN_BYTES_PER_SECOND / hz * (ticks - V_isn_last); 3240 if (SEQ_GT(projected_offset, V_isn_offset)) 3241 V_isn_offset = projected_offset; 3242 V_isn_offset_old = V_isn_offset; 3243 V_isn_last = ticks; 3244 } 3245 new_isn += V_isn_offset; 3246 ISN_UNLOCK(); 3247 return (new_isn); 3248 } 3249 3250 /* 3251 * When a specific ICMP unreachable message is received and the 3252 * connection state is SYN-SENT, drop the connection. This behavior 3253 * is controlled by the icmp_may_rst sysctl. 3254 */ 3255 static struct inpcb * 3256 tcp_drop_syn_sent(struct inpcb *inp, int errno) 3257 { 3258 struct tcpcb *tp; 3259 3260 NET_EPOCH_ASSERT(); 3261 INP_WLOCK_ASSERT(inp); 3262 3263 tp = intotcpcb(inp); 3264 if (tp->t_state != TCPS_SYN_SENT) 3265 return (inp); 3266 3267 if (IS_FASTOPEN(tp->t_flags)) 3268 tcp_fastopen_disable_path(tp); 3269 3270 tp = tcp_drop(tp, errno); 3271 if (tp != NULL) 3272 return (inp); 3273 else 3274 return (NULL); 3275 } 3276 3277 /* 3278 * When `need fragmentation' ICMP is received, update our idea of the MSS 3279 * based on the new value. Also nudge TCP to send something, since we 3280 * know the packet we just sent was dropped. 3281 * This duplicates some code in the tcp_mss() function in tcp_input.c. 3282 */ 3283 static struct inpcb * 3284 tcp_mtudisc_notify(struct inpcb *inp, int error) 3285 { 3286 3287 return (tcp_mtudisc(inp, -1)); 3288 } 3289 3290 static struct inpcb * 3291 tcp_mtudisc(struct inpcb *inp, int mtuoffer) 3292 { 3293 struct tcpcb *tp; 3294 struct socket *so; 3295 3296 INP_WLOCK_ASSERT(inp); 3297 3298 tp = intotcpcb(inp); 3299 KASSERT(tp != NULL, ("tcp_mtudisc: tp == NULL")); 3300 3301 tcp_mss_update(tp, -1, mtuoffer, NULL, NULL); 3302 3303 so = inp->inp_socket; 3304 SOCKBUF_LOCK(&so->so_snd); 3305 /* If the mss is larger than the socket buffer, decrease the mss. */ 3306 if (so->so_snd.sb_hiwat < tp->t_maxseg) 3307 tp->t_maxseg = so->so_snd.sb_hiwat; 3308 SOCKBUF_UNLOCK(&so->so_snd); 3309 3310 TCPSTAT_INC(tcps_mturesent); 3311 tp->t_rtttime = 0; 3312 tp->snd_nxt = tp->snd_una; 3313 tcp_free_sackholes(tp); 3314 tp->snd_recover = tp->snd_max; 3315 if (tp->t_flags & TF_SACK_PERMIT) 3316 EXIT_FASTRECOVERY(tp->t_flags); 3317 if (tp->t_fb->tfb_tcp_mtu_chg != NULL) { 3318 /* 3319 * Conceptually the snd_nxt setting 3320 * and freeing sack holes should 3321 * be done by the default stacks 3322 * own tfb_tcp_mtu_chg(). 3323 */ 3324 tp->t_fb->tfb_tcp_mtu_chg(tp); 3325 } 3326 if (tcp_output(tp) < 0) 3327 return (NULL); 3328 else 3329 return (inp); 3330 } 3331 3332 #ifdef INET 3333 /* 3334 * Look-up the routing entry to the peer of this inpcb. If no route 3335 * is found and it cannot be allocated, then return 0. This routine 3336 * is called by TCP routines that access the rmx structure and by 3337 * tcp_mss_update to get the peer/interface MTU. 3338 */ 3339 uint32_t 3340 tcp_maxmtu(struct in_conninfo *inc, struct tcp_ifcap *cap) 3341 { 3342 struct nhop_object *nh; 3343 struct ifnet *ifp; 3344 uint32_t maxmtu = 0; 3345 3346 KASSERT(inc != NULL, ("tcp_maxmtu with NULL in_conninfo pointer")); 3347 3348 if (inc->inc_faddr.s_addr != INADDR_ANY) { 3349 nh = fib4_lookup(inc->inc_fibnum, inc->inc_faddr, 0, NHR_NONE, 0); 3350 if (nh == NULL) 3351 return (0); 3352 3353 ifp = nh->nh_ifp; 3354 maxmtu = nh->nh_mtu; 3355 3356 /* Report additional interface capabilities. */ 3357 if (cap != NULL) { 3358 if (ifp->if_capenable & IFCAP_TSO4 && 3359 ifp->if_hwassist & CSUM_TSO) { 3360 cap->ifcap |= CSUM_TSO; 3361 cap->tsomax = ifp->if_hw_tsomax; 3362 cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 3363 cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 3364 } 3365 } 3366 } 3367 return (maxmtu); 3368 } 3369 #endif /* INET */ 3370 3371 #ifdef INET6 3372 uint32_t 3373 tcp_maxmtu6(struct in_conninfo *inc, struct tcp_ifcap *cap) 3374 { 3375 struct nhop_object *nh; 3376 struct in6_addr dst6; 3377 uint32_t scopeid; 3378 struct ifnet *ifp; 3379 uint32_t maxmtu = 0; 3380 3381 KASSERT(inc != NULL, ("tcp_maxmtu6 with NULL in_conninfo pointer")); 3382 3383 if (inc->inc_flags & INC_IPV6MINMTU) 3384 return (IPV6_MMTU); 3385 3386 if (!IN6_IS_ADDR_UNSPECIFIED(&inc->inc6_faddr)) { 3387 in6_splitscope(&inc->inc6_faddr, &dst6, &scopeid); 3388 nh = fib6_lookup(inc->inc_fibnum, &dst6, scopeid, NHR_NONE, 0); 3389 if (nh == NULL) 3390 return (0); 3391 3392 ifp = nh->nh_ifp; 3393 maxmtu = nh->nh_mtu; 3394 3395 /* Report additional interface capabilities. */ 3396 if (cap != NULL) { 3397 if (ifp->if_capenable & IFCAP_TSO6 && 3398 ifp->if_hwassist & CSUM_TSO) { 3399 cap->ifcap |= CSUM_TSO; 3400 cap->tsomax = ifp->if_hw_tsomax; 3401 cap->tsomaxsegcount = ifp->if_hw_tsomaxsegcount; 3402 cap->tsomaxsegsize = ifp->if_hw_tsomaxsegsize; 3403 } 3404 } 3405 } 3406 3407 return (maxmtu); 3408 } 3409 3410 /* 3411 * Handle setsockopt(IPV6_USE_MIN_MTU) by a TCP stack. 3412 * 3413 * XXXGL: we are updating inpcb here with INC_IPV6MINMTU flag. 3414 * The right place to do that is ip6_setpktopt() that has just been 3415 * executed. By the way it just filled ip6po_minmtu for us. 3416 */ 3417 void 3418 tcp6_use_min_mtu(struct tcpcb *tp) 3419 { 3420 struct inpcb *inp = tptoinpcb(tp); 3421 3422 INP_WLOCK_ASSERT(inp); 3423 /* 3424 * In case of the IPV6_USE_MIN_MTU socket 3425 * option, the INC_IPV6MINMTU flag to announce 3426 * a corresponding MSS during the initial 3427 * handshake. If the TCP connection is not in 3428 * the front states, just reduce the MSS being 3429 * used. This avoids the sending of TCP 3430 * segments which will be fragmented at the 3431 * IPv6 layer. 3432 */ 3433 inp->inp_inc.inc_flags |= INC_IPV6MINMTU; 3434 if ((tp->t_state >= TCPS_SYN_SENT) && 3435 (inp->inp_inc.inc_flags & INC_ISIPV6)) { 3436 struct ip6_pktopts *opt; 3437 3438 opt = inp->in6p_outputopts; 3439 if (opt != NULL && opt->ip6po_minmtu == IP6PO_MINMTU_ALL && 3440 tp->t_maxseg > TCP6_MSS) 3441 tp->t_maxseg = TCP6_MSS; 3442 } 3443 } 3444 #endif /* INET6 */ 3445 3446 /* 3447 * Calculate effective SMSS per RFC5681 definition for a given TCP 3448 * connection at its current state, taking into account SACK and etc. 3449 */ 3450 u_int 3451 tcp_maxseg(const struct tcpcb *tp) 3452 { 3453 u_int optlen; 3454 3455 if (tp->t_flags & TF_NOOPT) 3456 return (tp->t_maxseg); 3457 3458 /* 3459 * Here we have a simplified code from tcp_addoptions(), 3460 * without a proper loop, and having most of paddings hardcoded. 3461 * We might make mistakes with padding here in some edge cases, 3462 * but this is harmless, since result of tcp_maxseg() is used 3463 * only in cwnd and ssthresh estimations. 3464 */ 3465 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 3466 if (tp->t_flags & TF_RCVD_TSTMP) 3467 optlen = TCPOLEN_TSTAMP_APPA; 3468 else 3469 optlen = 0; 3470 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 3471 if (tp->t_flags & TF_SIGNATURE) 3472 optlen += PADTCPOLEN(TCPOLEN_SIGNATURE); 3473 #endif 3474 if ((tp->t_flags & TF_SACK_PERMIT) && tp->rcv_numsacks > 0) { 3475 optlen += TCPOLEN_SACKHDR; 3476 optlen += tp->rcv_numsacks * TCPOLEN_SACK; 3477 optlen = PADTCPOLEN(optlen); 3478 } 3479 } else { 3480 if (tp->t_flags & TF_REQ_TSTMP) 3481 optlen = TCPOLEN_TSTAMP_APPA; 3482 else 3483 optlen = PADTCPOLEN(TCPOLEN_MAXSEG); 3484 if (tp->t_flags & TF_REQ_SCALE) 3485 optlen += PADTCPOLEN(TCPOLEN_WINDOW); 3486 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 3487 if (tp->t_flags & TF_SIGNATURE) 3488 optlen += PADTCPOLEN(TCPOLEN_SIGNATURE); 3489 #endif 3490 if (tp->t_flags & TF_SACK_PERMIT) 3491 optlen += PADTCPOLEN(TCPOLEN_SACK_PERMITTED); 3492 } 3493 #undef PAD 3494 optlen = min(optlen, TCP_MAXOLEN); 3495 return (tp->t_maxseg - optlen); 3496 } 3497 3498 3499 u_int 3500 tcp_fixed_maxseg(const struct tcpcb *tp) 3501 { 3502 int optlen; 3503 3504 if (tp->t_flags & TF_NOOPT) 3505 return (tp->t_maxseg); 3506 3507 /* 3508 * Here we have a simplified code from tcp_addoptions(), 3509 * without a proper loop, and having most of paddings hardcoded. 3510 * We only consider fixed options that we would send every 3511 * time I.e. SACK is not considered. This is important 3512 * for cc modules to figure out what the modulo of the 3513 * cwnd should be. 3514 */ 3515 #define PAD(len) ((((len) / 4) + !!((len) % 4)) * 4) 3516 if (TCPS_HAVEESTABLISHED(tp->t_state)) { 3517 if (tp->t_flags & TF_RCVD_TSTMP) 3518 optlen = TCPOLEN_TSTAMP_APPA; 3519 else 3520 optlen = 0; 3521 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 3522 if (tp->t_flags & TF_SIGNATURE) 3523 optlen += PAD(TCPOLEN_SIGNATURE); 3524 #endif 3525 } else { 3526 if (tp->t_flags & TF_REQ_TSTMP) 3527 optlen = TCPOLEN_TSTAMP_APPA; 3528 else 3529 optlen = PAD(TCPOLEN_MAXSEG); 3530 if (tp->t_flags & TF_REQ_SCALE) 3531 optlen += PAD(TCPOLEN_WINDOW); 3532 #if defined(IPSEC_SUPPORT) || defined(TCP_SIGNATURE) 3533 if (tp->t_flags & TF_SIGNATURE) 3534 optlen += PAD(TCPOLEN_SIGNATURE); 3535 #endif 3536 if (tp->t_flags & TF_SACK_PERMIT) 3537 optlen += PAD(TCPOLEN_SACK_PERMITTED); 3538 } 3539 #undef PAD 3540 optlen = min(optlen, TCP_MAXOLEN); 3541 return (tp->t_maxseg - optlen); 3542 } 3543 3544 3545 3546 static int 3547 sysctl_drop(SYSCTL_HANDLER_ARGS) 3548 { 3549 /* addrs[0] is a foreign socket, addrs[1] is a local one. */ 3550 struct sockaddr_storage addrs[2]; 3551 struct inpcb *inp; 3552 struct tcpcb *tp; 3553 #ifdef INET 3554 struct sockaddr_in *fin = NULL, *lin = NULL; 3555 #endif 3556 struct epoch_tracker et; 3557 #ifdef INET6 3558 struct sockaddr_in6 *fin6, *lin6; 3559 #endif 3560 int error; 3561 3562 inp = NULL; 3563 #ifdef INET6 3564 fin6 = lin6 = NULL; 3565 #endif 3566 error = 0; 3567 3568 if (req->oldptr != NULL || req->oldlen != 0) 3569 return (EINVAL); 3570 if (req->newptr == NULL) 3571 return (EPERM); 3572 if (req->newlen < sizeof(addrs)) 3573 return (ENOMEM); 3574 error = SYSCTL_IN(req, &addrs, sizeof(addrs)); 3575 if (error) 3576 return (error); 3577 3578 switch (addrs[0].ss_family) { 3579 #ifdef INET6 3580 case AF_INET6: 3581 fin6 = (struct sockaddr_in6 *)&addrs[0]; 3582 lin6 = (struct sockaddr_in6 *)&addrs[1]; 3583 if (fin6->sin6_len != sizeof(struct sockaddr_in6) || 3584 lin6->sin6_len != sizeof(struct sockaddr_in6)) 3585 return (EINVAL); 3586 if (IN6_IS_ADDR_V4MAPPED(&fin6->sin6_addr)) { 3587 if (!IN6_IS_ADDR_V4MAPPED(&lin6->sin6_addr)) 3588 return (EINVAL); 3589 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[0]); 3590 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[1]); 3591 #ifdef INET 3592 fin = (struct sockaddr_in *)&addrs[0]; 3593 lin = (struct sockaddr_in *)&addrs[1]; 3594 #endif 3595 break; 3596 } 3597 error = sa6_embedscope(fin6, V_ip6_use_defzone); 3598 if (error) 3599 return (error); 3600 error = sa6_embedscope(lin6, V_ip6_use_defzone); 3601 if (error) 3602 return (error); 3603 break; 3604 #endif 3605 #ifdef INET 3606 case AF_INET: 3607 fin = (struct sockaddr_in *)&addrs[0]; 3608 lin = (struct sockaddr_in *)&addrs[1]; 3609 if (fin->sin_len != sizeof(struct sockaddr_in) || 3610 lin->sin_len != sizeof(struct sockaddr_in)) 3611 return (EINVAL); 3612 break; 3613 #endif 3614 default: 3615 return (EINVAL); 3616 } 3617 NET_EPOCH_ENTER(et); 3618 switch (addrs[0].ss_family) { 3619 #ifdef INET6 3620 case AF_INET6: 3621 inp = in6_pcblookup(&V_tcbinfo, &fin6->sin6_addr, 3622 fin6->sin6_port, &lin6->sin6_addr, lin6->sin6_port, 3623 INPLOOKUP_WLOCKPCB, NULL); 3624 break; 3625 #endif 3626 #ifdef INET 3627 case AF_INET: 3628 inp = in_pcblookup(&V_tcbinfo, fin->sin_addr, fin->sin_port, 3629 lin->sin_addr, lin->sin_port, INPLOOKUP_WLOCKPCB, NULL); 3630 break; 3631 #endif 3632 } 3633 if (inp != NULL) { 3634 if (!SOLISTENING(inp->inp_socket)) { 3635 tp = intotcpcb(inp); 3636 tp = tcp_drop(tp, ECONNABORTED); 3637 if (tp != NULL) 3638 INP_WUNLOCK(inp); 3639 } else 3640 INP_WUNLOCK(inp); 3641 } else 3642 error = ESRCH; 3643 NET_EPOCH_EXIT(et); 3644 return (error); 3645 } 3646 3647 SYSCTL_PROC(_net_inet_tcp, TCPCTL_DROP, drop, 3648 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP | 3649 CTLFLAG_NEEDGIANT, NULL, 0, sysctl_drop, "", 3650 "Drop TCP connection"); 3651 3652 static int 3653 tcp_sysctl_setsockopt(SYSCTL_HANDLER_ARGS) 3654 { 3655 return (sysctl_setsockopt(oidp, arg1, arg2, req, &V_tcbinfo, 3656 &tcp_ctloutput_set)); 3657 } 3658 3659 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, setsockopt, 3660 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP | 3661 CTLFLAG_MPSAFE, NULL, 0, tcp_sysctl_setsockopt, "", 3662 "Set socket option for TCP endpoint"); 3663 3664 #ifdef KERN_TLS 3665 static int 3666 sysctl_switch_tls(SYSCTL_HANDLER_ARGS) 3667 { 3668 /* addrs[0] is a foreign socket, addrs[1] is a local one. */ 3669 struct sockaddr_storage addrs[2]; 3670 struct inpcb *inp; 3671 #ifdef INET 3672 struct sockaddr_in *fin = NULL, *lin = NULL; 3673 #endif 3674 struct epoch_tracker et; 3675 #ifdef INET6 3676 struct sockaddr_in6 *fin6, *lin6; 3677 #endif 3678 int error; 3679 3680 inp = NULL; 3681 #ifdef INET6 3682 fin6 = lin6 = NULL; 3683 #endif 3684 error = 0; 3685 3686 if (req->oldptr != NULL || req->oldlen != 0) 3687 return (EINVAL); 3688 if (req->newptr == NULL) 3689 return (EPERM); 3690 if (req->newlen < sizeof(addrs)) 3691 return (ENOMEM); 3692 error = SYSCTL_IN(req, &addrs, sizeof(addrs)); 3693 if (error) 3694 return (error); 3695 3696 switch (addrs[0].ss_family) { 3697 #ifdef INET6 3698 case AF_INET6: 3699 fin6 = (struct sockaddr_in6 *)&addrs[0]; 3700 lin6 = (struct sockaddr_in6 *)&addrs[1]; 3701 if (fin6->sin6_len != sizeof(struct sockaddr_in6) || 3702 lin6->sin6_len != sizeof(struct sockaddr_in6)) 3703 return (EINVAL); 3704 if (IN6_IS_ADDR_V4MAPPED(&fin6->sin6_addr)) { 3705 if (!IN6_IS_ADDR_V4MAPPED(&lin6->sin6_addr)) 3706 return (EINVAL); 3707 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[0]); 3708 in6_sin6_2_sin_in_sock((struct sockaddr *)&addrs[1]); 3709 #ifdef INET 3710 fin = (struct sockaddr_in *)&addrs[0]; 3711 lin = (struct sockaddr_in *)&addrs[1]; 3712 #endif 3713 break; 3714 } 3715 error = sa6_embedscope(fin6, V_ip6_use_defzone); 3716 if (error) 3717 return (error); 3718 error = sa6_embedscope(lin6, V_ip6_use_defzone); 3719 if (error) 3720 return (error); 3721 break; 3722 #endif 3723 #ifdef INET 3724 case AF_INET: 3725 fin = (struct sockaddr_in *)&addrs[0]; 3726 lin = (struct sockaddr_in *)&addrs[1]; 3727 if (fin->sin_len != sizeof(struct sockaddr_in) || 3728 lin->sin_len != sizeof(struct sockaddr_in)) 3729 return (EINVAL); 3730 break; 3731 #endif 3732 default: 3733 return (EINVAL); 3734 } 3735 NET_EPOCH_ENTER(et); 3736 switch (addrs[0].ss_family) { 3737 #ifdef INET6 3738 case AF_INET6: 3739 inp = in6_pcblookup(&V_tcbinfo, &fin6->sin6_addr, 3740 fin6->sin6_port, &lin6->sin6_addr, lin6->sin6_port, 3741 INPLOOKUP_WLOCKPCB, NULL); 3742 break; 3743 #endif 3744 #ifdef INET 3745 case AF_INET: 3746 inp = in_pcblookup(&V_tcbinfo, fin->sin_addr, fin->sin_port, 3747 lin->sin_addr, lin->sin_port, INPLOOKUP_WLOCKPCB, NULL); 3748 break; 3749 #endif 3750 } 3751 NET_EPOCH_EXIT(et); 3752 if (inp != NULL) { 3753 struct socket *so; 3754 3755 so = inp->inp_socket; 3756 soref(so); 3757 error = ktls_set_tx_mode(so, 3758 arg2 == 0 ? TCP_TLS_MODE_SW : TCP_TLS_MODE_IFNET); 3759 INP_WUNLOCK(inp); 3760 sorele(so); 3761 } else 3762 error = ESRCH; 3763 return (error); 3764 } 3765 3766 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, switch_to_sw_tls, 3767 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP | 3768 CTLFLAG_NEEDGIANT, NULL, 0, sysctl_switch_tls, "", 3769 "Switch TCP connection to SW TLS"); 3770 SYSCTL_PROC(_net_inet_tcp, OID_AUTO, switch_to_ifnet_tls, 3771 CTLFLAG_VNET | CTLTYPE_STRUCT | CTLFLAG_WR | CTLFLAG_SKIP | 3772 CTLFLAG_NEEDGIANT, NULL, 1, sysctl_switch_tls, "", 3773 "Switch TCP connection to ifnet TLS"); 3774 #endif 3775 3776 /* 3777 * Generate a standardized TCP log line for use throughout the 3778 * tcp subsystem. Memory allocation is done with M_NOWAIT to 3779 * allow use in the interrupt context. 3780 * 3781 * NB: The caller MUST free(s, M_TCPLOG) the returned string. 3782 * NB: The function may return NULL if memory allocation failed. 3783 * 3784 * Due to header inclusion and ordering limitations the struct ip 3785 * and ip6_hdr pointers have to be passed as void pointers. 3786 */ 3787 char * 3788 tcp_log_vain(struct in_conninfo *inc, struct tcphdr *th, const void *ip4hdr, 3789 const void *ip6hdr) 3790 { 3791 3792 /* Is logging enabled? */ 3793 if (V_tcp_log_in_vain == 0) 3794 return (NULL); 3795 3796 return (tcp_log_addr(inc, th, ip4hdr, ip6hdr)); 3797 } 3798 3799 char * 3800 tcp_log_addrs(struct in_conninfo *inc, struct tcphdr *th, const void *ip4hdr, 3801 const void *ip6hdr) 3802 { 3803 3804 /* Is logging enabled? */ 3805 if (tcp_log_debug == 0) 3806 return (NULL); 3807 3808 return (tcp_log_addr(inc, th, ip4hdr, ip6hdr)); 3809 } 3810 3811 static char * 3812 tcp_log_addr(struct in_conninfo *inc, struct tcphdr *th, const void *ip4hdr, 3813 const void *ip6hdr) 3814 { 3815 char *s, *sp; 3816 size_t size; 3817 #ifdef INET 3818 const struct ip *ip = (const struct ip *)ip4hdr; 3819 #endif 3820 #ifdef INET6 3821 const struct ip6_hdr *ip6 = (const struct ip6_hdr *)ip6hdr; 3822 #endif /* INET6 */ 3823 3824 /* 3825 * The log line looks like this: 3826 * "TCP: [1.2.3.4]:50332 to [1.2.3.4]:80 tcpflags 0x2<SYN>" 3827 */ 3828 size = sizeof("TCP: []:12345 to []:12345 tcpflags 0x2<>") + 3829 sizeof(PRINT_TH_FLAGS) + 1 + 3830 #ifdef INET6 3831 2 * INET6_ADDRSTRLEN; 3832 #else 3833 2 * INET_ADDRSTRLEN; 3834 #endif /* INET6 */ 3835 3836 s = malloc(size, M_TCPLOG, M_ZERO|M_NOWAIT); 3837 if (s == NULL) 3838 return (NULL); 3839 3840 strcat(s, "TCP: ["); 3841 sp = s + strlen(s); 3842 3843 if (inc && ((inc->inc_flags & INC_ISIPV6) == 0)) { 3844 inet_ntoa_r(inc->inc_faddr, sp); 3845 sp = s + strlen(s); 3846 sprintf(sp, "]:%i to [", ntohs(inc->inc_fport)); 3847 sp = s + strlen(s); 3848 inet_ntoa_r(inc->inc_laddr, sp); 3849 sp = s + strlen(s); 3850 sprintf(sp, "]:%i", ntohs(inc->inc_lport)); 3851 #ifdef INET6 3852 } else if (inc) { 3853 ip6_sprintf(sp, &inc->inc6_faddr); 3854 sp = s + strlen(s); 3855 sprintf(sp, "]:%i to [", ntohs(inc->inc_fport)); 3856 sp = s + strlen(s); 3857 ip6_sprintf(sp, &inc->inc6_laddr); 3858 sp = s + strlen(s); 3859 sprintf(sp, "]:%i", ntohs(inc->inc_lport)); 3860 } else if (ip6 && th) { 3861 ip6_sprintf(sp, &ip6->ip6_src); 3862 sp = s + strlen(s); 3863 sprintf(sp, "]:%i to [", ntohs(th->th_sport)); 3864 sp = s + strlen(s); 3865 ip6_sprintf(sp, &ip6->ip6_dst); 3866 sp = s + strlen(s); 3867 sprintf(sp, "]:%i", ntohs(th->th_dport)); 3868 #endif /* INET6 */ 3869 #ifdef INET 3870 } else if (ip && th) { 3871 inet_ntoa_r(ip->ip_src, sp); 3872 sp = s + strlen(s); 3873 sprintf(sp, "]:%i to [", ntohs(th->th_sport)); 3874 sp = s + strlen(s); 3875 inet_ntoa_r(ip->ip_dst, sp); 3876 sp = s + strlen(s); 3877 sprintf(sp, "]:%i", ntohs(th->th_dport)); 3878 #endif /* INET */ 3879 } else { 3880 free(s, M_TCPLOG); 3881 return (NULL); 3882 } 3883 sp = s + strlen(s); 3884 if (th) 3885 sprintf(sp, " tcpflags 0x%b", tcp_get_flags(th), PRINT_TH_FLAGS); 3886 if (*(s + size - 1) != '\0') 3887 panic("%s: string too long", __func__); 3888 return (s); 3889 } 3890 3891 /* 3892 * A subroutine which makes it easy to track TCP state changes with DTrace. 3893 * This function shouldn't be called for t_state initializations that don't 3894 * correspond to actual TCP state transitions. 3895 */ 3896 void 3897 tcp_state_change(struct tcpcb *tp, int newstate) 3898 { 3899 #if defined(KDTRACE_HOOKS) 3900 int pstate = tp->t_state; 3901 #endif 3902 3903 TCPSTATES_DEC(tp->t_state); 3904 TCPSTATES_INC(newstate); 3905 tp->t_state = newstate; 3906 TCP_PROBE6(state__change, NULL, tp, NULL, tp, NULL, pstate); 3907 } 3908 3909 /* 3910 * Create an external-format (``xtcpcb'') structure using the information in 3911 * the kernel-format tcpcb structure pointed to by tp. This is done to 3912 * reduce the spew of irrelevant information over this interface, to isolate 3913 * user code from changes in the kernel structure, and potentially to provide 3914 * information-hiding if we decide that some of this information should be 3915 * hidden from users. 3916 */ 3917 void 3918 tcp_inptoxtp(const struct inpcb *inp, struct xtcpcb *xt) 3919 { 3920 struct tcpcb *tp = intotcpcb(inp); 3921 sbintime_t now; 3922 3923 bzero(xt, sizeof(*xt)); 3924 xt->t_state = tp->t_state; 3925 xt->t_logstate = tcp_get_bblog_state(tp); 3926 xt->t_flags = tp->t_flags; 3927 xt->t_sndzerowin = tp->t_sndzerowin; 3928 xt->t_sndrexmitpack = tp->t_sndrexmitpack; 3929 xt->t_rcvoopack = tp->t_rcvoopack; 3930 xt->t_rcv_wnd = tp->rcv_wnd; 3931 xt->t_snd_wnd = tp->snd_wnd; 3932 xt->t_snd_cwnd = tp->snd_cwnd; 3933 xt->t_snd_ssthresh = tp->snd_ssthresh; 3934 xt->t_dsack_bytes = tp->t_dsack_bytes; 3935 xt->t_dsack_tlp_bytes = tp->t_dsack_tlp_bytes; 3936 xt->t_dsack_pack = tp->t_dsack_pack; 3937 xt->t_maxseg = tp->t_maxseg; 3938 xt->xt_ecn = (tp->t_flags2 & TF2_ECN_PERMIT) ? 1 : 0 + 3939 (tp->t_flags2 & TF2_ACE_PERMIT) ? 2 : 0; 3940 3941 now = getsbinuptime(); 3942 #define COPYTIMER(which,where) do { \ 3943 if (tp->t_timers[which] != SBT_MAX) \ 3944 xt->where = (tp->t_timers[which] - now) / SBT_1MS; \ 3945 else \ 3946 xt->where = 0; \ 3947 } while (0) 3948 COPYTIMER(TT_DELACK, tt_delack); 3949 COPYTIMER(TT_REXMT, tt_rexmt); 3950 COPYTIMER(TT_PERSIST, tt_persist); 3951 COPYTIMER(TT_KEEP, tt_keep); 3952 COPYTIMER(TT_2MSL, tt_2msl); 3953 #undef COPYTIMER 3954 xt->t_rcvtime = 1000 * (ticks - tp->t_rcvtime) / hz; 3955 3956 xt->xt_encaps_port = tp->t_port; 3957 bcopy(tp->t_fb->tfb_tcp_block_name, xt->xt_stack, 3958 TCP_FUNCTION_NAME_LEN_MAX); 3959 bcopy(CC_ALGO(tp)->name, xt->xt_cc, TCP_CA_NAME_MAX); 3960 #ifdef TCP_BLACKBOX 3961 (void)tcp_log_get_id(tp, xt->xt_logid); 3962 #endif 3963 3964 xt->xt_len = sizeof(struct xtcpcb); 3965 in_pcbtoxinpcb(inp, &xt->xt_inp); 3966 /* 3967 * TCP doesn't use inp_ppcb pointer, we embed inpcb into tcpcb. 3968 * Fixup the pointer that in_pcbtoxinpcb() has set. When printing 3969 * TCP netstat(1) used to use this pointer, so this fixup needs to 3970 * stay for stable/14. 3971 */ 3972 xt->xt_inp.inp_ppcb = (uintptr_t)tp; 3973 } 3974 3975 void 3976 tcp_log_end_status(struct tcpcb *tp, uint8_t status) 3977 { 3978 uint32_t bit, i; 3979 3980 if ((tp == NULL) || 3981 (status > TCP_EI_STATUS_MAX_VALUE) || 3982 (status == 0)) { 3983 /* Invalid */ 3984 return; 3985 } 3986 if (status > (sizeof(uint32_t) * 8)) { 3987 /* Should this be a KASSERT? */ 3988 return; 3989 } 3990 bit = 1U << (status - 1); 3991 if (bit & tp->t_end_info_status) { 3992 /* already logged */ 3993 return; 3994 } 3995 for (i = 0; i < TCP_END_BYTE_INFO; i++) { 3996 if (tp->t_end_info_bytes[i] == TCP_EI_EMPTY_SLOT) { 3997 tp->t_end_info_bytes[i] = status; 3998 tp->t_end_info_status |= bit; 3999 break; 4000 } 4001 } 4002 } 4003 4004 int 4005 tcp_can_enable_pacing(void) 4006 { 4007 4008 if ((tcp_pacing_limit == -1) || 4009 (tcp_pacing_limit > number_of_tcp_connections_pacing)) { 4010 atomic_fetchadd_int(&number_of_tcp_connections_pacing, 1); 4011 shadow_num_connections = number_of_tcp_connections_pacing; 4012 return (1); 4013 } else { 4014 counter_u64_add(tcp_pacing_failures, 1); 4015 return (0); 4016 } 4017 } 4018 4019 static uint8_t tcp_pacing_warning = 0; 4020 4021 void 4022 tcp_decrement_paced_conn(void) 4023 { 4024 uint32_t ret; 4025 4026 ret = atomic_fetchadd_int(&number_of_tcp_connections_pacing, -1); 4027 shadow_num_connections = number_of_tcp_connections_pacing; 4028 KASSERT(ret != 0, ("tcp_paced_connection_exits -1 would cause wrap?")); 4029 if (ret == 0) { 4030 if (tcp_pacing_limit != -1) { 4031 printf("Warning all pacing is now disabled, count decrements invalidly!\n"); 4032 tcp_pacing_limit = 0; 4033 } else if (tcp_pacing_warning == 0) { 4034 printf("Warning pacing count is invalid, invalid decrement\n"); 4035 tcp_pacing_warning = 1; 4036 } 4037 } 4038 } 4039 4040 static void 4041 tcp_default_switch_failed(struct tcpcb *tp) 4042 { 4043 /* 4044 * If a switch fails we only need to 4045 * care about two things: 4046 * a) The t_flags2 4047 * and 4048 * b) The timer granularity. 4049 * Timeouts, at least for now, don't use the 4050 * old callout system in the other stacks so 4051 * those are hopefully safe. 4052 */ 4053 tcp_lro_features_off(tp); 4054 tcp_change_time_units(tp, TCP_TMR_GRANULARITY_TICKS); 4055 } 4056 4057 #ifdef TCP_ACCOUNTING 4058 int 4059 tcp_do_ack_accounting(struct tcpcb *tp, struct tcphdr *th, struct tcpopt *to, uint32_t tiwin, int mss) 4060 { 4061 if (SEQ_LT(th->th_ack, tp->snd_una)) { 4062 /* Do we have a SACK? */ 4063 if (to->to_flags & TOF_SACK) { 4064 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) { 4065 tp->tcp_cnt_counters[ACK_SACK]++; 4066 } 4067 return (ACK_SACK); 4068 } else { 4069 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) { 4070 tp->tcp_cnt_counters[ACK_BEHIND]++; 4071 } 4072 return (ACK_BEHIND); 4073 } 4074 } else if (th->th_ack == tp->snd_una) { 4075 /* Do we have a SACK? */ 4076 if (to->to_flags & TOF_SACK) { 4077 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) { 4078 tp->tcp_cnt_counters[ACK_SACK]++; 4079 } 4080 return (ACK_SACK); 4081 } else if (tiwin != tp->snd_wnd) { 4082 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) { 4083 tp->tcp_cnt_counters[ACK_RWND]++; 4084 } 4085 return (ACK_RWND); 4086 } else { 4087 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) { 4088 tp->tcp_cnt_counters[ACK_DUPACK]++; 4089 } 4090 return (ACK_DUPACK); 4091 } 4092 } else { 4093 if (!SEQ_GT(th->th_ack, tp->snd_max)) { 4094 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) { 4095 tp->tcp_cnt_counters[CNT_OF_ACKS_IN] += (((th->th_ack - tp->snd_una) + mss - 1)/mss); 4096 } 4097 } 4098 if (to->to_flags & TOF_SACK) { 4099 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) { 4100 tp->tcp_cnt_counters[ACK_CUMACK_SACK]++; 4101 } 4102 return (ACK_CUMACK_SACK); 4103 } else { 4104 if (tp->t_flags2 & TF2_TCP_ACCOUNTING) { 4105 tp->tcp_cnt_counters[ACK_CUMACK]++; 4106 } 4107 return (ACK_CUMACK); 4108 } 4109 } 4110 } 4111 #endif 4112 4113 void 4114 tcp_change_time_units(struct tcpcb *tp, int granularity) 4115 { 4116 if (tp->t_tmr_granularity == granularity) { 4117 /* We are there */ 4118 return; 4119 } 4120 if (granularity == TCP_TMR_GRANULARITY_USEC) { 4121 KASSERT((tp->t_tmr_granularity == TCP_TMR_GRANULARITY_TICKS), 4122 ("Granularity is not TICKS its %u in tp:%p", 4123 tp->t_tmr_granularity, tp)); 4124 tp->t_rttlow = TICKS_2_USEC(tp->t_rttlow); 4125 if (tp->t_srtt > 1) { 4126 uint32_t val, frac; 4127 4128 val = tp->t_srtt >> TCP_RTT_SHIFT; 4129 frac = tp->t_srtt & 0x1f; 4130 tp->t_srtt = TICKS_2_USEC(val); 4131 /* 4132 * frac is the fractional part of the srtt (if any) 4133 * but its in ticks and every bit represents 4134 * 1/32nd of a hz. 4135 */ 4136 if (frac) { 4137 if (hz == 1000) { 4138 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_MSEC) / (uint64_t)TCP_RTT_SCALE); 4139 } else { 4140 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_SEC) / ((uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE)); 4141 } 4142 tp->t_srtt += frac; 4143 } 4144 } 4145 if (tp->t_rttvar) { 4146 uint32_t val, frac; 4147 4148 val = tp->t_rttvar >> TCP_RTTVAR_SHIFT; 4149 frac = tp->t_rttvar & 0x1f; 4150 tp->t_rttvar = TICKS_2_USEC(val); 4151 /* 4152 * frac is the fractional part of the srtt (if any) 4153 * but its in ticks and every bit represents 4154 * 1/32nd of a hz. 4155 */ 4156 if (frac) { 4157 if (hz == 1000) { 4158 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_MSEC) / (uint64_t)TCP_RTT_SCALE); 4159 } else { 4160 frac = (((uint64_t)frac * (uint64_t)HPTS_USEC_IN_SEC) / ((uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE)); 4161 } 4162 tp->t_rttvar += frac; 4163 } 4164 } 4165 tp->t_tmr_granularity = TCP_TMR_GRANULARITY_USEC; 4166 } else if (granularity == TCP_TMR_GRANULARITY_TICKS) { 4167 /* Convert back to ticks, with */ 4168 KASSERT((tp->t_tmr_granularity == TCP_TMR_GRANULARITY_USEC), 4169 ("Granularity is not USEC its %u in tp:%p", 4170 tp->t_tmr_granularity, tp)); 4171 if (tp->t_srtt > 1) { 4172 uint32_t val, frac; 4173 4174 val = USEC_2_TICKS(tp->t_srtt); 4175 frac = tp->t_srtt % (HPTS_USEC_IN_SEC / hz); 4176 tp->t_srtt = val << TCP_RTT_SHIFT; 4177 /* 4178 * frac is the fractional part here is left 4179 * over from converting to hz and shifting. 4180 * We need to convert this to the 5 bit 4181 * remainder. 4182 */ 4183 if (frac) { 4184 if (hz == 1000) { 4185 frac = (((uint64_t)frac * (uint64_t)TCP_RTT_SCALE) / (uint64_t)HPTS_USEC_IN_MSEC); 4186 } else { 4187 frac = (((uint64_t)frac * (uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE) /(uint64_t)HPTS_USEC_IN_SEC); 4188 } 4189 tp->t_srtt += frac; 4190 } 4191 } 4192 if (tp->t_rttvar) { 4193 uint32_t val, frac; 4194 4195 val = USEC_2_TICKS(tp->t_rttvar); 4196 frac = tp->t_srtt % (HPTS_USEC_IN_SEC / hz); 4197 tp->t_rttvar = val << TCP_RTTVAR_SHIFT; 4198 /* 4199 * frac is the fractional part here is left 4200 * over from converting to hz and shifting. 4201 * We need to convert this to the 5 bit 4202 * remainder. 4203 */ 4204 if (frac) { 4205 if (hz == 1000) { 4206 frac = (((uint64_t)frac * (uint64_t)TCP_RTT_SCALE) / (uint64_t)HPTS_USEC_IN_MSEC); 4207 } else { 4208 frac = (((uint64_t)frac * (uint64_t)(hz) * (uint64_t)TCP_RTT_SCALE) /(uint64_t)HPTS_USEC_IN_SEC); 4209 } 4210 tp->t_rttvar += frac; 4211 } 4212 } 4213 tp->t_rttlow = USEC_2_TICKS(tp->t_rttlow); 4214 tp->t_tmr_granularity = TCP_TMR_GRANULARITY_TICKS; 4215 } 4216 #ifdef INVARIANTS 4217 else { 4218 panic("Unknown granularity:%d tp:%p", 4219 granularity, tp); 4220 } 4221 #endif 4222 } 4223 4224 void 4225 tcp_handle_orphaned_packets(struct tcpcb *tp) 4226 { 4227 struct mbuf *save, *m, *prev; 4228 /* 4229 * Called when a stack switch is occuring from the fini() 4230 * of the old stack. We assue the init() as already been 4231 * run of the new stack and it has set the t_flags2 to 4232 * what it supports. This function will then deal with any 4233 * differences i.e. cleanup packets that maybe queued that 4234 * the newstack does not support. 4235 */ 4236 4237 if (tp->t_flags2 & TF2_MBUF_L_ACKS) 4238 return; 4239 if ((tp->t_flags2 & TF2_SUPPORTS_MBUFQ) == 0 && 4240 !STAILQ_EMPTY(&tp->t_inqueue)) { 4241 /* 4242 * It is unsafe to process the packets since a 4243 * reset may be lurking in them (its rare but it 4244 * can occur). If we were to find a RST, then we 4245 * would end up dropping the connection and the 4246 * INP lock, so when we return the caller (tcp_usrreq) 4247 * will blow up when it trys to unlock the inp. 4248 * This new stack does not do any fancy LRO features 4249 * so all we can do is toss the packets. 4250 */ 4251 m = STAILQ_FIRST(&tp->t_inqueue); 4252 STAILQ_INIT(&tp->t_inqueue); 4253 STAILQ_FOREACH_FROM_SAFE(m, &tp->t_inqueue, m_stailqpkt, save) 4254 m_freem(m); 4255 } else { 4256 /* 4257 * Here we have a stack that does mbuf queuing but 4258 * does not support compressed ack's. We must 4259 * walk all the mbufs and discard any compressed acks. 4260 */ 4261 STAILQ_FOREACH_SAFE(m, &tp->t_inqueue, m_stailqpkt, save) { 4262 if (m->m_flags & M_ACKCMP) { 4263 if (m == STAILQ_FIRST(&tp->t_inqueue)) 4264 STAILQ_REMOVE_HEAD(&tp->t_inqueue, 4265 m_stailqpkt); 4266 else 4267 STAILQ_REMOVE_AFTER(&tp->t_inqueue, 4268 prev, m_stailqpkt); 4269 m_freem(m); 4270 } else 4271 prev = m; 4272 } 4273 } 4274 } 4275 4276 #ifdef TCP_REQUEST_TRK 4277 uint32_t 4278 tcp_estimate_tls_overhead(struct socket *so, uint64_t tls_usr_bytes) 4279 { 4280 #ifdef KERN_TLS 4281 struct ktls_session *tls; 4282 uint32_t rec_oh, records; 4283 4284 tls = so->so_snd.sb_tls_info; 4285 if (tls == NULL) 4286 return (0); 4287 4288 rec_oh = tls->params.tls_hlen + tls->params.tls_tlen; 4289 records = ((tls_usr_bytes + tls->params.max_frame_len - 1)/tls->params.max_frame_len); 4290 return (records * rec_oh); 4291 #else 4292 return (0); 4293 #endif 4294 } 4295 4296 extern uint32_t tcp_stale_entry_time; 4297 uint32_t tcp_stale_entry_time = 250000; 4298 SYSCTL_UINT(_net_inet_tcp, OID_AUTO, usrlog_stale, CTLFLAG_RW, 4299 &tcp_stale_entry_time, 250000, "Time that a tcpreq entry without a sendfile ages out"); 4300 4301 void 4302 tcp_req_log_req_info(struct tcpcb *tp, struct tcp_sendfile_track *req, 4303 uint16_t slot, uint8_t val, uint64_t offset, uint64_t nbytes) 4304 { 4305 if (tcp_bblogging_on(tp)) { 4306 union tcp_log_stackspecific log; 4307 struct timeval tv; 4308 4309 memset(&log.u_bbr, 0, sizeof(log.u_bbr)); 4310 log.u_bbr.inhpts = tcp_in_hpts(tp); 4311 log.u_bbr.flex8 = val; 4312 log.u_bbr.rttProp = req->timestamp; 4313 log.u_bbr.delRate = req->start; 4314 log.u_bbr.cur_del_rate = req->end; 4315 log.u_bbr.flex1 = req->start_seq; 4316 log.u_bbr.flex2 = req->end_seq; 4317 log.u_bbr.flex3 = req->flags; 4318 log.u_bbr.flex4 = ((req->localtime >> 32) & 0x00000000ffffffff); 4319 log.u_bbr.flex5 = (req->localtime & 0x00000000ffffffff); 4320 log.u_bbr.flex7 = slot; 4321 log.u_bbr.bw_inuse = offset; 4322 /* nbytes = flex6 | epoch */ 4323 log.u_bbr.flex6 = ((nbytes >> 32) & 0x00000000ffffffff); 4324 log.u_bbr.epoch = (nbytes & 0x00000000ffffffff); 4325 /* cspr = lt_epoch | pkts_out */ 4326 log.u_bbr.lt_epoch = ((req->cspr >> 32) & 0x00000000ffffffff); 4327 log.u_bbr.pkts_out |= (req->cspr & 0x00000000ffffffff); 4328 log.u_bbr.applimited = tp->t_tcpreq_closed; 4329 log.u_bbr.applimited <<= 8; 4330 log.u_bbr.applimited |= tp->t_tcpreq_open; 4331 log.u_bbr.applimited <<= 8; 4332 log.u_bbr.applimited |= tp->t_tcpreq_req; 4333 log.u_bbr.timeStamp = tcp_get_usecs(&tv); 4334 TCP_LOG_EVENTP(tp, NULL, 4335 &tptosocket(tp)->so_rcv, 4336 &tptosocket(tp)->so_snd, 4337 TCP_LOG_REQ_T, 0, 4338 0, &log, false, &tv); 4339 } 4340 } 4341 4342 void 4343 tcp_req_free_a_slot(struct tcpcb *tp, struct tcp_sendfile_track *ent) 4344 { 4345 if (tp->t_tcpreq_req > 0) 4346 tp->t_tcpreq_req--; 4347 if (ent->flags & TCP_TRK_TRACK_FLG_OPEN) { 4348 if (tp->t_tcpreq_open > 0) 4349 tp->t_tcpreq_open--; 4350 } else { 4351 if (tp->t_tcpreq_closed > 0) 4352 tp->t_tcpreq_closed--; 4353 } 4354 ent->flags = TCP_TRK_TRACK_FLG_EMPTY; 4355 } 4356 4357 static void 4358 tcp_req_check_for_stale_entries(struct tcpcb *tp, uint64_t ts, int rm_oldest) 4359 { 4360 struct tcp_sendfile_track *ent; 4361 uint64_t time_delta, oldest_delta; 4362 int i, oldest, oldest_set = 0, cnt_rm = 0; 4363 4364 for(i = 0; i < MAX_TCP_TRK_REQ; i++) { 4365 ent = &tp->t_tcpreq_info[i]; 4366 if (ent->flags != TCP_TRK_TRACK_FLG_USED) { 4367 /* 4368 * We only care about closed end ranges 4369 * that are allocated and have no sendfile 4370 * ever touching them. They would be in 4371 * state USED. 4372 */ 4373 continue; 4374 } 4375 if (ts >= ent->localtime) 4376 time_delta = ts - ent->localtime; 4377 else 4378 time_delta = 0; 4379 if (time_delta && 4380 ((oldest_delta < time_delta) || (oldest_set == 0))) { 4381 oldest_set = 1; 4382 oldest = i; 4383 oldest_delta = time_delta; 4384 } 4385 if (tcp_stale_entry_time && (time_delta >= tcp_stale_entry_time)) { 4386 /* 4387 * No sendfile in a our time-limit 4388 * time to purge it. 4389 */ 4390 cnt_rm++; 4391 tcp_req_log_req_info(tp, &tp->t_tcpreq_info[i], i, TCP_TRK_REQ_LOG_STALE, 4392 time_delta, 0); 4393 tcp_req_free_a_slot(tp, ent); 4394 } 4395 } 4396 if ((cnt_rm == 0) && rm_oldest && oldest_set) { 4397 ent = &tp->t_tcpreq_info[oldest]; 4398 tcp_req_log_req_info(tp, &tp->t_tcpreq_info[i], i, TCP_TRK_REQ_LOG_STALE, 4399 oldest_delta, 1); 4400 tcp_req_free_a_slot(tp, ent); 4401 } 4402 } 4403 4404 int 4405 tcp_req_check_for_comp(struct tcpcb *tp, tcp_seq ack_point) 4406 { 4407 int i, ret=0; 4408 struct tcp_sendfile_track *ent; 4409 4410 /* Clean up any old closed end requests that are now completed */ 4411 if (tp->t_tcpreq_req == 0) 4412 return(0); 4413 if (tp->t_tcpreq_closed == 0) 4414 return(0); 4415 for(i = 0; i < MAX_TCP_TRK_REQ; i++) { 4416 ent = &tp->t_tcpreq_info[i]; 4417 /* Skip empty ones */ 4418 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY) 4419 continue; 4420 /* Skip open ones */ 4421 if (ent->flags & TCP_TRK_TRACK_FLG_OPEN) 4422 continue; 4423 if (SEQ_GEQ(ack_point, ent->end_seq)) { 4424 /* We are past it -- free it */ 4425 tcp_req_log_req_info(tp, ent, 4426 i, TCP_TRK_REQ_LOG_FREED, 0, 0); 4427 tcp_req_free_a_slot(tp, ent); 4428 ret++; 4429 } 4430 } 4431 return (ret); 4432 } 4433 4434 int 4435 tcp_req_is_entry_comp(struct tcpcb *tp, struct tcp_sendfile_track *ent, tcp_seq ack_point) 4436 { 4437 if (tp->t_tcpreq_req == 0) 4438 return(-1); 4439 if (tp->t_tcpreq_closed == 0) 4440 return(-1); 4441 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY) 4442 return(-1); 4443 if (SEQ_GEQ(ack_point, ent->end_seq)) { 4444 return (1); 4445 } 4446 return (0); 4447 } 4448 4449 struct tcp_sendfile_track * 4450 tcp_req_find_a_req_that_is_completed_by(struct tcpcb *tp, tcp_seq th_ack, int *ip) 4451 { 4452 /* 4453 * Given an ack point (th_ack) walk through our entries and 4454 * return the first one found that th_ack goes past the 4455 * end_seq. 4456 */ 4457 struct tcp_sendfile_track *ent; 4458 int i; 4459 4460 if (tp->t_tcpreq_req == 0) { 4461 /* none open */ 4462 return (NULL); 4463 } 4464 for(i = 0; i < MAX_TCP_TRK_REQ; i++) { 4465 ent = &tp->t_tcpreq_info[i]; 4466 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY) 4467 continue; 4468 if ((ent->flags & TCP_TRK_TRACK_FLG_OPEN) == 0) { 4469 if (SEQ_GEQ(th_ack, ent->end_seq)) { 4470 *ip = i; 4471 return (ent); 4472 } 4473 } 4474 } 4475 return (NULL); 4476 } 4477 4478 struct tcp_sendfile_track * 4479 tcp_req_find_req_for_seq(struct tcpcb *tp, tcp_seq seq) 4480 { 4481 struct tcp_sendfile_track *ent; 4482 int i; 4483 4484 if (tp->t_tcpreq_req == 0) { 4485 /* none open */ 4486 return (NULL); 4487 } 4488 for(i = 0; i < MAX_TCP_TRK_REQ; i++) { 4489 ent = &tp->t_tcpreq_info[i]; 4490 tcp_req_log_req_info(tp, ent, i, TCP_TRK_REQ_LOG_SEARCH, 4491 (uint64_t)seq, 0); 4492 if (ent->flags == TCP_TRK_TRACK_FLG_EMPTY) { 4493 continue; 4494 } 4495 if (ent->flags & TCP_TRK_TRACK_FLG_OPEN) { 4496 /* 4497 * An open end request only needs to 4498 * match the beginning seq or be 4499 * all we have (once we keep going on 4500 * a open end request we may have a seq 4501 * wrap). 4502 */ 4503 if ((SEQ_GEQ(seq, ent->start_seq)) || 4504 (tp->t_tcpreq_closed == 0)) 4505 return (ent); 4506 } else { 4507 /* 4508 * For this one we need to 4509 * be a bit more careful if its 4510 * completed at least. 4511 */ 4512 if ((SEQ_GEQ(seq, ent->start_seq)) && 4513 (SEQ_LT(seq, ent->end_seq))) { 4514 return (ent); 4515 } 4516 } 4517 } 4518 return (NULL); 4519 } 4520 4521 /* Should this be in its own file tcp_req.c ? */ 4522 struct tcp_sendfile_track * 4523 tcp_req_alloc_req_full(struct tcpcb *tp, struct tcp_snd_req *req, uint64_t ts, int rec_dups) 4524 { 4525 struct tcp_sendfile_track *fil; 4526 int i, allocated; 4527 4528 /* In case the stack does not check for completions do so now */ 4529 tcp_req_check_for_comp(tp, tp->snd_una); 4530 /* Check for stale entries */ 4531 if (tp->t_tcpreq_req) 4532 tcp_req_check_for_stale_entries(tp, ts, 4533 (tp->t_tcpreq_req >= MAX_TCP_TRK_REQ)); 4534 /* Check to see if this is a duplicate of one not started */ 4535 if (tp->t_tcpreq_req) { 4536 for(i = 0, allocated = 0; i < MAX_TCP_TRK_REQ; i++) { 4537 fil = &tp->t_tcpreq_info[i]; 4538 if (fil->flags != TCP_TRK_TRACK_FLG_USED) 4539 continue; 4540 if ((fil->timestamp == req->timestamp) && 4541 (fil->start == req->start) && 4542 ((fil->flags & TCP_TRK_TRACK_FLG_OPEN) || 4543 (fil->end == req->end))) { 4544 /* 4545 * We already have this request 4546 * and it has not been started with sendfile. 4547 * This probably means the user was returned 4548 * a 4xx of some sort and its going to age 4549 * out, lets not duplicate it. 4550 */ 4551 return(fil); 4552 } 4553 } 4554 } 4555 /* Ok if there is no room at the inn we are in trouble */ 4556 if (tp->t_tcpreq_req >= MAX_TCP_TRK_REQ) { 4557 tcp_trace_point(tp, TCP_TP_REQ_LOG_FAIL); 4558 for(i = 0; i < MAX_TCP_TRK_REQ; i++) { 4559 tcp_req_log_req_info(tp, &tp->t_tcpreq_info[i], 4560 i, TCP_TRK_REQ_LOG_ALLOCFAIL, 0, 0); 4561 } 4562 return (NULL); 4563 } 4564 for(i = 0, allocated = 0; i < MAX_TCP_TRK_REQ; i++) { 4565 fil = &tp->t_tcpreq_info[i]; 4566 if (fil->flags == TCP_TRK_TRACK_FLG_EMPTY) { 4567 allocated = 1; 4568 fil->flags = TCP_TRK_TRACK_FLG_USED; 4569 fil->timestamp = req->timestamp; 4570 fil->localtime = ts; 4571 fil->start = req->start; 4572 if (req->flags & TCP_LOG_HTTPD_RANGE_END) { 4573 fil->end = req->end; 4574 } else { 4575 fil->end = 0; 4576 fil->flags |= TCP_TRK_TRACK_FLG_OPEN; 4577 } 4578 /* 4579 * We can set the min boundaries to the TCP Sequence space, 4580 * but it might be found to be further up when sendfile 4581 * actually runs on this range (if it ever does). 4582 */ 4583 fil->sbcc_at_s = tptosocket(tp)->so_snd.sb_ccc; 4584 fil->start_seq = tp->snd_una + 4585 tptosocket(tp)->so_snd.sb_ccc; 4586 fil->end_seq = (fil->start_seq + ((uint32_t)(fil->end - fil->start))); 4587 if (tptosocket(tp)->so_snd.sb_tls_info) { 4588 /* 4589 * This session is doing TLS. Take a swag guess 4590 * at the overhead. 4591 */ 4592 fil->end_seq += tcp_estimate_tls_overhead( 4593 tptosocket(tp), (fil->end - fil->start)); 4594 } 4595 tp->t_tcpreq_req++; 4596 if (fil->flags & TCP_TRK_TRACK_FLG_OPEN) 4597 tp->t_tcpreq_open++; 4598 else 4599 tp->t_tcpreq_closed++; 4600 tcp_req_log_req_info(tp, fil, i, 4601 TCP_TRK_REQ_LOG_NEW, 0, 0); 4602 break; 4603 } else 4604 fil = NULL; 4605 } 4606 return (fil); 4607 } 4608 4609 void 4610 tcp_req_alloc_req(struct tcpcb *tp, union tcp_log_userdata *user, uint64_t ts) 4611 { 4612 (void)tcp_req_alloc_req_full(tp, &user->tcp_req, ts, 1); 4613 } 4614 #endif 4615 4616 void 4617 tcp_log_socket_option(struct tcpcb *tp, uint32_t option_num, uint32_t option_val, int err) 4618 { 4619 if (tcp_bblogging_on(tp)) { 4620 struct tcp_log_buffer *l; 4621 4622 l = tcp_log_event(tp, NULL, 4623 &tptosocket(tp)->so_rcv, 4624 &tptosocket(tp)->so_snd, 4625 TCP_LOG_SOCKET_OPT, 4626 err, 0, NULL, 1, 4627 NULL, NULL, 0, NULL); 4628 if (l) { 4629 l->tlb_flex1 = option_num; 4630 l->tlb_flex2 = option_val; 4631 } 4632 } 4633 } 4634 4635 uint32_t 4636 tcp_get_srtt(struct tcpcb *tp, int granularity) 4637 { 4638 uint32_t srtt; 4639 4640 KASSERT(granularity == TCP_TMR_GRANULARITY_USEC || 4641 granularity == TCP_TMR_GRANULARITY_TICKS, 4642 ("%s: called with unexpected granularity %d", __func__, 4643 granularity)); 4644 4645 srtt = tp->t_srtt; 4646 4647 /* 4648 * We only support two granularities. If the stored granularity 4649 * does not match the granularity requested by the caller, 4650 * convert the stored value to the requested unit of granularity. 4651 */ 4652 if (tp->t_tmr_granularity != granularity) { 4653 if (granularity == TCP_TMR_GRANULARITY_USEC) 4654 srtt = TICKS_2_USEC(srtt); 4655 else 4656 srtt = USEC_2_TICKS(srtt); 4657 } 4658 4659 /* 4660 * If the srtt is stored with ticks granularity, we need to 4661 * unshift to get the actual value. We do this after the 4662 * conversion above (if one was necessary) in order to maximize 4663 * precision. 4664 */ 4665 if (tp->t_tmr_granularity == TCP_TMR_GRANULARITY_TICKS) 4666 srtt = srtt >> TCP_RTT_SHIFT; 4667 4668 return (srtt); 4669 } 4670 4671 void 4672 tcp_account_for_send(struct tcpcb *tp, uint32_t len, uint8_t is_rxt, 4673 uint8_t is_tlp, bool hw_tls) 4674 { 4675 4676 if (is_tlp) { 4677 tp->t_sndtlppack++; 4678 tp->t_sndtlpbyte += len; 4679 } 4680 /* To get total bytes sent you must add t_snd_rxt_bytes to t_sndbytes */ 4681 if (is_rxt) 4682 tp->t_snd_rxt_bytes += len; 4683 else 4684 tp->t_sndbytes += len; 4685 4686 #ifdef KERN_TLS 4687 if (hw_tls && is_rxt && len != 0) { 4688 uint64_t rexmit_percent; 4689 4690 rexmit_percent = (1000ULL * tp->t_snd_rxt_bytes) / 4691 (10ULL * (tp->t_snd_rxt_bytes + tp->t_sndbytes)); 4692 if (rexmit_percent > ktls_ifnet_max_rexmit_pct) 4693 ktls_disable_ifnet(tp); 4694 } 4695 #endif 4696 } 4697