| 1 | /* $NetBSD: tcp_subr.c,v 1.267 2016/11/09 03:33:30 ozaki-r Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. |
| 5 | * 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 project 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 PROJECT 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 PROJECT 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 | /*- |
| 33 | * Copyright (c) 1997, 1998, 2000, 2001, 2008 The NetBSD Foundation, Inc. |
| 34 | * All rights reserved. |
| 35 | * |
| 36 | * This code is derived from software contributed to The NetBSD Foundation |
| 37 | * by Jason R. Thorpe and Kevin M. Lahey of the Numerical Aerospace Simulation |
| 38 | * Facility, NASA Ames Research Center. |
| 39 | * |
| 40 | * Redistribution and use in source and binary forms, with or without |
| 41 | * modification, are permitted provided that the following conditions |
| 42 | * are met: |
| 43 | * 1. Redistributions of source code must retain the above copyright |
| 44 | * notice, this list of conditions and the following disclaimer. |
| 45 | * 2. Redistributions in binary form must reproduce the above copyright |
| 46 | * notice, this list of conditions and the following disclaimer in the |
| 47 | * documentation and/or other materials provided with the distribution. |
| 48 | * |
| 49 | * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS |
| 50 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED |
| 51 | * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 52 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS |
| 53 | * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 54 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 55 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 56 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 57 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 58 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 59 | * POSSIBILITY OF SUCH DAMAGE. |
| 60 | */ |
| 61 | |
| 62 | /* |
| 63 | * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 |
| 64 | * The Regents of the University of California. All rights reserved. |
| 65 | * |
| 66 | * Redistribution and use in source and binary forms, with or without |
| 67 | * modification, are permitted provided that the following conditions |
| 68 | * are met: |
| 69 | * 1. Redistributions of source code must retain the above copyright |
| 70 | * notice, this list of conditions and the following disclaimer. |
| 71 | * 2. Redistributions in binary form must reproduce the above copyright |
| 72 | * notice, this list of conditions and the following disclaimer in the |
| 73 | * documentation and/or other materials provided with the distribution. |
| 74 | * 3. Neither the name of the University nor the names of its contributors |
| 75 | * may be used to endorse or promote products derived from this software |
| 76 | * without specific prior written permission. |
| 77 | * |
| 78 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 79 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 80 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 81 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 82 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 83 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 84 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 85 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 86 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 87 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 88 | * SUCH DAMAGE. |
| 89 | * |
| 90 | * @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95 |
| 91 | */ |
| 92 | |
| 93 | #include <sys/cdefs.h> |
| 94 | __KERNEL_RCSID(0, "$NetBSD: tcp_subr.c,v 1.267 2016/11/09 03:33:30 ozaki-r Exp $" ); |
| 95 | |
| 96 | #ifdef _KERNEL_OPT |
| 97 | #include "opt_inet.h" |
| 98 | #include "opt_ipsec.h" |
| 99 | #include "opt_tcp_compat_42.h" |
| 100 | #include "opt_inet_csum.h" |
| 101 | #include "opt_mbuftrace.h" |
| 102 | #endif |
| 103 | |
| 104 | #include <sys/param.h> |
| 105 | #include <sys/atomic.h> |
| 106 | #include <sys/proc.h> |
| 107 | #include <sys/systm.h> |
| 108 | #include <sys/mbuf.h> |
| 109 | #include <sys/once.h> |
| 110 | #include <sys/socket.h> |
| 111 | #include <sys/socketvar.h> |
| 112 | #include <sys/protosw.h> |
| 113 | #include <sys/errno.h> |
| 114 | #include <sys/kernel.h> |
| 115 | #include <sys/pool.h> |
| 116 | #include <sys/md5.h> |
| 117 | #include <sys/cprng.h> |
| 118 | |
| 119 | #include <net/route.h> |
| 120 | #include <net/if.h> |
| 121 | |
| 122 | #include <netinet/in.h> |
| 123 | #include <netinet/in_systm.h> |
| 124 | #include <netinet/ip.h> |
| 125 | #include <netinet/in_pcb.h> |
| 126 | #include <netinet/ip_var.h> |
| 127 | #include <netinet/ip_icmp.h> |
| 128 | |
| 129 | #ifdef INET6 |
| 130 | #ifndef INET |
| 131 | #include <netinet/in.h> |
| 132 | #endif |
| 133 | #include <netinet/ip6.h> |
| 134 | #include <netinet6/in6_pcb.h> |
| 135 | #include <netinet6/ip6_var.h> |
| 136 | #include <netinet6/in6_var.h> |
| 137 | #include <netinet6/ip6protosw.h> |
| 138 | #include <netinet/icmp6.h> |
| 139 | #include <netinet6/nd6.h> |
| 140 | #endif |
| 141 | |
| 142 | #include <netinet/tcp.h> |
| 143 | #include <netinet/tcp_fsm.h> |
| 144 | #include <netinet/tcp_seq.h> |
| 145 | #include <netinet/tcp_timer.h> |
| 146 | #include <netinet/tcp_var.h> |
| 147 | #include <netinet/tcp_vtw.h> |
| 148 | #include <netinet/tcp_private.h> |
| 149 | #include <netinet/tcp_congctl.h> |
| 150 | #include <netinet/tcpip.h> |
| 151 | |
| 152 | #ifdef IPSEC |
| 153 | #include <netipsec/ipsec.h> |
| 154 | #include <netipsec/xform.h> |
| 155 | #ifdef INET6 |
| 156 | #include <netipsec/ipsec6.h> |
| 157 | #endif |
| 158 | #include <netipsec/key.h> |
| 159 | #endif /* IPSEC*/ |
| 160 | |
| 161 | |
| 162 | struct inpcbtable tcbtable; /* head of queue of active tcpcb's */ |
| 163 | u_int32_t tcp_now; /* slow ticks, for RFC 1323 timestamps */ |
| 164 | |
| 165 | percpu_t *tcpstat_percpu; |
| 166 | |
| 167 | /* patchable/settable parameters for tcp */ |
| 168 | int tcp_mssdflt = TCP_MSS; |
| 169 | int tcp_minmss = TCP_MINMSS; |
| 170 | int tcp_rttdflt = TCPTV_SRTTDFLT / PR_SLOWHZ; |
| 171 | int tcp_do_rfc1323 = 1; /* window scaling / timestamps (obsolete) */ |
| 172 | int tcp_do_rfc1948 = 0; /* ISS by cryptographic hash */ |
| 173 | int tcp_do_sack = 1; /* selective acknowledgement */ |
| 174 | int tcp_do_win_scale = 1; /* RFC1323 window scaling */ |
| 175 | int tcp_do_timestamps = 1; /* RFC1323 timestamps */ |
| 176 | int tcp_ack_on_push = 0; /* set to enable immediate ACK-on-PUSH */ |
| 177 | int tcp_do_ecn = 0; /* Explicit Congestion Notification */ |
| 178 | #ifndef TCP_INIT_WIN |
| 179 | #define TCP_INIT_WIN 4 /* initial slow start window */ |
| 180 | #endif |
| 181 | #ifndef TCP_INIT_WIN_LOCAL |
| 182 | #define TCP_INIT_WIN_LOCAL 4 /* initial slow start window for local nets */ |
| 183 | #endif |
| 184 | /* |
| 185 | * Up to 5 we scale linearly, to reach 3 * 1460; then (iw) * 1460. |
| 186 | * This is to simulate current behavior for iw == 4 |
| 187 | */ |
| 188 | int tcp_init_win_max[] = { |
| 189 | 1 * 1460, |
| 190 | 1 * 1460, |
| 191 | 2 * 1460, |
| 192 | 2 * 1460, |
| 193 | 3 * 1460, |
| 194 | 5 * 1460, |
| 195 | 6 * 1460, |
| 196 | 7 * 1460, |
| 197 | 8 * 1460, |
| 198 | 9 * 1460, |
| 199 | 10 * 1460 |
| 200 | }; |
| 201 | int tcp_init_win = TCP_INIT_WIN; |
| 202 | int tcp_init_win_local = TCP_INIT_WIN_LOCAL; |
| 203 | int tcp_mss_ifmtu = 0; |
| 204 | #ifdef TCP_COMPAT_42 |
| 205 | int tcp_compat_42 = 1; |
| 206 | #else |
| 207 | int tcp_compat_42 = 0; |
| 208 | #endif |
| 209 | int tcp_rst_ppslim = 100; /* 100pps */ |
| 210 | int tcp_ackdrop_ppslim = 100; /* 100pps */ |
| 211 | int tcp_do_loopback_cksum = 0; |
| 212 | int tcp_do_abc = 1; /* RFC3465 Appropriate byte counting. */ |
| 213 | int tcp_abc_aggressive = 1; /* 1: L=2*SMSS 0: L=1*SMSS */ |
| 214 | int tcp_sack_tp_maxholes = 32; |
| 215 | int tcp_sack_globalmaxholes = 1024; |
| 216 | int tcp_sack_globalholes = 0; |
| 217 | int tcp_ecn_maxretries = 1; |
| 218 | int tcp_msl_enable = 1; /* enable TIME_WAIT truncation */ |
| 219 | int tcp_msl_loop = PR_SLOWHZ; /* MSL for loopback */ |
| 220 | int tcp_msl_local = 5 * PR_SLOWHZ; /* MSL for 'local' */ |
| 221 | int tcp_msl_remote = TCPTV_MSL; /* MSL otherwise */ |
| 222 | int tcp_msl_remote_threshold = TCPTV_SRTTDFLT; /* RTT threshold */ |
| 223 | int tcp_rttlocal = 0; /* Use RTT to decide who's 'local' */ |
| 224 | |
| 225 | int tcp4_vtw_enable = 0; /* 1 to enable */ |
| 226 | int tcp6_vtw_enable = 0; /* 1 to enable */ |
| 227 | int tcp_vtw_was_enabled = 0; |
| 228 | int tcp_vtw_entries = 1 << 4; /* 16 vestigial TIME_WAIT entries */ |
| 229 | |
| 230 | /* tcb hash */ |
| 231 | #ifndef TCBHASHSIZE |
| 232 | #define TCBHASHSIZE 128 |
| 233 | #endif |
| 234 | int tcbhashsize = TCBHASHSIZE; |
| 235 | |
| 236 | /* syn hash parameters */ |
| 237 | #define TCP_SYN_HASH_SIZE 293 |
| 238 | #define TCP_SYN_BUCKET_SIZE 35 |
| 239 | int tcp_syn_cache_size = TCP_SYN_HASH_SIZE; |
| 240 | int tcp_syn_cache_limit = TCP_SYN_HASH_SIZE*TCP_SYN_BUCKET_SIZE; |
| 241 | int tcp_syn_bucket_limit = 3*TCP_SYN_BUCKET_SIZE; |
| 242 | struct syn_cache_head tcp_syn_cache[TCP_SYN_HASH_SIZE]; |
| 243 | |
| 244 | int tcp_freeq(struct tcpcb *); |
| 245 | static int tcp_iss_secret_init(void); |
| 246 | |
| 247 | #ifdef INET |
| 248 | static void tcp_mtudisc_callback(struct in_addr); |
| 249 | #endif |
| 250 | |
| 251 | #ifdef INET6 |
| 252 | void tcp6_mtudisc(struct in6pcb *, int); |
| 253 | #endif |
| 254 | |
| 255 | static struct pool tcpcb_pool; |
| 256 | |
| 257 | static int tcp_drainwanted; |
| 258 | |
| 259 | #ifdef TCP_CSUM_COUNTERS |
| 260 | #include <sys/device.h> |
| 261 | |
| 262 | #if defined(INET) |
| 263 | struct evcnt tcp_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 264 | NULL, "tcp" , "hwcsum bad" ); |
| 265 | struct evcnt tcp_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 266 | NULL, "tcp" , "hwcsum ok" ); |
| 267 | struct evcnt tcp_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 268 | NULL, "tcp" , "hwcsum data" ); |
| 269 | struct evcnt tcp_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 270 | NULL, "tcp" , "swcsum" ); |
| 271 | |
| 272 | EVCNT_ATTACH_STATIC(tcp_hwcsum_bad); |
| 273 | EVCNT_ATTACH_STATIC(tcp_hwcsum_ok); |
| 274 | EVCNT_ATTACH_STATIC(tcp_hwcsum_data); |
| 275 | EVCNT_ATTACH_STATIC(tcp_swcsum); |
| 276 | #endif /* defined(INET) */ |
| 277 | |
| 278 | #if defined(INET6) |
| 279 | struct evcnt tcp6_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 280 | NULL, "tcp6" , "hwcsum bad" ); |
| 281 | struct evcnt tcp6_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 282 | NULL, "tcp6" , "hwcsum ok" ); |
| 283 | struct evcnt tcp6_hwcsum_data = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 284 | NULL, "tcp6" , "hwcsum data" ); |
| 285 | struct evcnt tcp6_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 286 | NULL, "tcp6" , "swcsum" ); |
| 287 | |
| 288 | EVCNT_ATTACH_STATIC(tcp6_hwcsum_bad); |
| 289 | EVCNT_ATTACH_STATIC(tcp6_hwcsum_ok); |
| 290 | EVCNT_ATTACH_STATIC(tcp6_hwcsum_data); |
| 291 | EVCNT_ATTACH_STATIC(tcp6_swcsum); |
| 292 | #endif /* defined(INET6) */ |
| 293 | #endif /* TCP_CSUM_COUNTERS */ |
| 294 | |
| 295 | |
| 296 | #ifdef TCP_OUTPUT_COUNTERS |
| 297 | #include <sys/device.h> |
| 298 | |
| 299 | struct evcnt tcp_output_bigheader = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 300 | NULL, "tcp" , "output big header" ); |
| 301 | struct evcnt tcp_output_predict_hit = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 302 | NULL, "tcp" , "output predict hit" ); |
| 303 | struct evcnt tcp_output_predict_miss = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 304 | NULL, "tcp" , "output predict miss" ); |
| 305 | struct evcnt tcp_output_copysmall = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 306 | NULL, "tcp" , "output copy small" ); |
| 307 | struct evcnt tcp_output_copybig = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 308 | NULL, "tcp" , "output copy big" ); |
| 309 | struct evcnt tcp_output_refbig = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 310 | NULL, "tcp" , "output reference big" ); |
| 311 | |
| 312 | EVCNT_ATTACH_STATIC(tcp_output_bigheader); |
| 313 | EVCNT_ATTACH_STATIC(tcp_output_predict_hit); |
| 314 | EVCNT_ATTACH_STATIC(tcp_output_predict_miss); |
| 315 | EVCNT_ATTACH_STATIC(tcp_output_copysmall); |
| 316 | EVCNT_ATTACH_STATIC(tcp_output_copybig); |
| 317 | EVCNT_ATTACH_STATIC(tcp_output_refbig); |
| 318 | |
| 319 | #endif /* TCP_OUTPUT_COUNTERS */ |
| 320 | |
| 321 | #ifdef TCP_REASS_COUNTERS |
| 322 | #include <sys/device.h> |
| 323 | |
| 324 | struct evcnt tcp_reass_ = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 325 | NULL, "tcp_reass" , "calls" ); |
| 326 | struct evcnt tcp_reass_empty = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 327 | &tcp_reass_, "tcp_reass" , "insert into empty queue" ); |
| 328 | struct evcnt tcp_reass_iteration[8] = { |
| 329 | EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass" , ">7 iterations" ), |
| 330 | EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass" , "1 iteration" ), |
| 331 | EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass" , "2 iterations" ), |
| 332 | EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass" , "3 iterations" ), |
| 333 | EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass" , "4 iterations" ), |
| 334 | EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass" , "5 iterations" ), |
| 335 | EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass" , "6 iterations" ), |
| 336 | EVCNT_INITIALIZER(EVCNT_TYPE_MISC, &tcp_reass_, "tcp_reass" , "7 iterations" ), |
| 337 | }; |
| 338 | struct evcnt tcp_reass_prependfirst = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 339 | &tcp_reass_, "tcp_reass" , "prepend to first" ); |
| 340 | struct evcnt tcp_reass_prepend = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 341 | &tcp_reass_, "tcp_reass" , "prepend" ); |
| 342 | struct evcnt tcp_reass_insert = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 343 | &tcp_reass_, "tcp_reass" , "insert" ); |
| 344 | struct evcnt tcp_reass_inserttail = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 345 | &tcp_reass_, "tcp_reass" , "insert at tail" ); |
| 346 | struct evcnt tcp_reass_append = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 347 | &tcp_reass_, "tcp_reass" , "append" ); |
| 348 | struct evcnt tcp_reass_appendtail = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 349 | &tcp_reass_, "tcp_reass" , "append to tail fragment" ); |
| 350 | struct evcnt tcp_reass_overlaptail = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 351 | &tcp_reass_, "tcp_reass" , "overlap at end" ); |
| 352 | struct evcnt tcp_reass_overlapfront = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 353 | &tcp_reass_, "tcp_reass" , "overlap at start" ); |
| 354 | struct evcnt tcp_reass_segdup = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 355 | &tcp_reass_, "tcp_reass" , "duplicate segment" ); |
| 356 | struct evcnt tcp_reass_fragdup = EVCNT_INITIALIZER(EVCNT_TYPE_MISC, |
| 357 | &tcp_reass_, "tcp_reass" , "duplicate fragment" ); |
| 358 | |
| 359 | EVCNT_ATTACH_STATIC(tcp_reass_); |
| 360 | EVCNT_ATTACH_STATIC(tcp_reass_empty); |
| 361 | EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 0); |
| 362 | EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 1); |
| 363 | EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 2); |
| 364 | EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 3); |
| 365 | EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 4); |
| 366 | EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 5); |
| 367 | EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 6); |
| 368 | EVCNT_ATTACH_STATIC2(tcp_reass_iteration, 7); |
| 369 | EVCNT_ATTACH_STATIC(tcp_reass_prependfirst); |
| 370 | EVCNT_ATTACH_STATIC(tcp_reass_prepend); |
| 371 | EVCNT_ATTACH_STATIC(tcp_reass_insert); |
| 372 | EVCNT_ATTACH_STATIC(tcp_reass_inserttail); |
| 373 | EVCNT_ATTACH_STATIC(tcp_reass_append); |
| 374 | EVCNT_ATTACH_STATIC(tcp_reass_appendtail); |
| 375 | EVCNT_ATTACH_STATIC(tcp_reass_overlaptail); |
| 376 | EVCNT_ATTACH_STATIC(tcp_reass_overlapfront); |
| 377 | EVCNT_ATTACH_STATIC(tcp_reass_segdup); |
| 378 | EVCNT_ATTACH_STATIC(tcp_reass_fragdup); |
| 379 | |
| 380 | #endif /* TCP_REASS_COUNTERS */ |
| 381 | |
| 382 | #ifdef MBUFTRACE |
| 383 | struct mowner tcp_mowner = MOWNER_INIT("tcp" , "" ); |
| 384 | struct mowner tcp_rx_mowner = MOWNER_INIT("tcp" , "rx" ); |
| 385 | struct mowner tcp_tx_mowner = MOWNER_INIT("tcp" , "tx" ); |
| 386 | struct mowner tcp_sock_mowner = MOWNER_INIT("tcp" , "sock" ); |
| 387 | struct mowner tcp_sock_rx_mowner = MOWNER_INIT("tcp" , "sock rx" ); |
| 388 | struct mowner tcp_sock_tx_mowner = MOWNER_INIT("tcp" , "sock tx" ); |
| 389 | #endif |
| 390 | |
| 391 | callout_t tcp_slowtimo_ch; |
| 392 | |
| 393 | static int |
| 394 | do_tcpinit(void) |
| 395 | { |
| 396 | |
| 397 | in_pcbinit(&tcbtable, tcbhashsize, tcbhashsize); |
| 398 | pool_init(&tcpcb_pool, sizeof(struct tcpcb), 0, 0, 0, "tcpcbpl" , |
| 399 | NULL, IPL_SOFTNET); |
| 400 | |
| 401 | tcp_usrreq_init(); |
| 402 | |
| 403 | /* Initialize timer state. */ |
| 404 | tcp_timer_init(); |
| 405 | |
| 406 | /* Initialize the compressed state engine. */ |
| 407 | syn_cache_init(); |
| 408 | |
| 409 | /* Initialize the congestion control algorithms. */ |
| 410 | tcp_congctl_init(); |
| 411 | |
| 412 | /* Initialize the TCPCB template. */ |
| 413 | tcp_tcpcb_template(); |
| 414 | |
| 415 | /* Initialize reassembly queue */ |
| 416 | tcpipqent_init(); |
| 417 | |
| 418 | /* SACK */ |
| 419 | tcp_sack_init(); |
| 420 | |
| 421 | MOWNER_ATTACH(&tcp_tx_mowner); |
| 422 | MOWNER_ATTACH(&tcp_rx_mowner); |
| 423 | MOWNER_ATTACH(&tcp_reass_mowner); |
| 424 | MOWNER_ATTACH(&tcp_sock_mowner); |
| 425 | MOWNER_ATTACH(&tcp_sock_tx_mowner); |
| 426 | MOWNER_ATTACH(&tcp_sock_rx_mowner); |
| 427 | MOWNER_ATTACH(&tcp_mowner); |
| 428 | |
| 429 | tcpstat_percpu = percpu_alloc(sizeof(uint64_t) * TCP_NSTATS); |
| 430 | |
| 431 | vtw_earlyinit(); |
| 432 | |
| 433 | callout_init(&tcp_slowtimo_ch, CALLOUT_MPSAFE); |
| 434 | callout_reset(&tcp_slowtimo_ch, 1, tcp_slowtimo, NULL); |
| 435 | |
| 436 | return 0; |
| 437 | } |
| 438 | |
| 439 | void |
| 440 | tcp_init_common(unsigned basehlen) |
| 441 | { |
| 442 | static ONCE_DECL(dotcpinit); |
| 443 | unsigned hlen = basehlen + sizeof(struct tcphdr); |
| 444 | unsigned oldhlen; |
| 445 | |
| 446 | if (max_linkhdr + hlen > MHLEN) |
| 447 | panic("tcp_init" ); |
| 448 | while ((oldhlen = max_protohdr) < hlen) |
| 449 | atomic_cas_uint(&max_protohdr, oldhlen, hlen); |
| 450 | |
| 451 | RUN_ONCE(&dotcpinit, do_tcpinit); |
| 452 | } |
| 453 | |
| 454 | /* |
| 455 | * Tcp initialization |
| 456 | */ |
| 457 | void |
| 458 | tcp_init(void) |
| 459 | { |
| 460 | |
| 461 | icmp_mtudisc_callback_register(tcp_mtudisc_callback); |
| 462 | |
| 463 | tcp_init_common(sizeof(struct ip)); |
| 464 | } |
| 465 | |
| 466 | /* |
| 467 | * Create template to be used to send tcp packets on a connection. |
| 468 | * Call after host entry created, allocates an mbuf and fills |
| 469 | * in a skeletal tcp/ip header, minimizing the amount of work |
| 470 | * necessary when the connection is used. |
| 471 | */ |
| 472 | struct mbuf * |
| 473 | tcp_template(struct tcpcb *tp) |
| 474 | { |
| 475 | struct inpcb *inp = tp->t_inpcb; |
| 476 | #ifdef INET6 |
| 477 | struct in6pcb *in6p = tp->t_in6pcb; |
| 478 | #endif |
| 479 | struct tcphdr *n; |
| 480 | struct mbuf *m; |
| 481 | int hlen; |
| 482 | |
| 483 | switch (tp->t_family) { |
| 484 | case AF_INET: |
| 485 | hlen = sizeof(struct ip); |
| 486 | if (inp) |
| 487 | break; |
| 488 | #ifdef INET6 |
| 489 | if (in6p) { |
| 490 | /* mapped addr case */ |
| 491 | if (IN6_IS_ADDR_V4MAPPED(&in6p->in6p_laddr) |
| 492 | && IN6_IS_ADDR_V4MAPPED(&in6p->in6p_faddr)) |
| 493 | break; |
| 494 | } |
| 495 | #endif |
| 496 | return NULL; /*EINVAL*/ |
| 497 | #ifdef INET6 |
| 498 | case AF_INET6: |
| 499 | hlen = sizeof(struct ip6_hdr); |
| 500 | if (in6p) { |
| 501 | /* more sainty check? */ |
| 502 | break; |
| 503 | } |
| 504 | return NULL; /*EINVAL*/ |
| 505 | #endif |
| 506 | default: |
| 507 | hlen = 0; /*pacify gcc*/ |
| 508 | return NULL; /*EAFNOSUPPORT*/ |
| 509 | } |
| 510 | #ifdef DIAGNOSTIC |
| 511 | if (hlen + sizeof(struct tcphdr) > MCLBYTES) |
| 512 | panic("mclbytes too small for t_template" ); |
| 513 | #endif |
| 514 | m = tp->t_template; |
| 515 | if (m && m->m_len == hlen + sizeof(struct tcphdr)) |
| 516 | ; |
| 517 | else { |
| 518 | if (m) |
| 519 | m_freem(m); |
| 520 | m = tp->t_template = NULL; |
| 521 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
| 522 | if (m && hlen + sizeof(struct tcphdr) > MHLEN) { |
| 523 | MCLGET(m, M_DONTWAIT); |
| 524 | if ((m->m_flags & M_EXT) == 0) { |
| 525 | m_free(m); |
| 526 | m = NULL; |
| 527 | } |
| 528 | } |
| 529 | if (m == NULL) |
| 530 | return NULL; |
| 531 | MCLAIM(m, &tcp_mowner); |
| 532 | m->m_pkthdr.len = m->m_len = hlen + sizeof(struct tcphdr); |
| 533 | } |
| 534 | |
| 535 | memset(mtod(m, void *), 0, m->m_len); |
| 536 | |
| 537 | n = (struct tcphdr *)(mtod(m, char *) + hlen); |
| 538 | |
| 539 | switch (tp->t_family) { |
| 540 | case AF_INET: |
| 541 | { |
| 542 | struct ipovly *ipov; |
| 543 | mtod(m, struct ip *)->ip_v = 4; |
| 544 | mtod(m, struct ip *)->ip_hl = hlen >> 2; |
| 545 | ipov = mtod(m, struct ipovly *); |
| 546 | ipov->ih_pr = IPPROTO_TCP; |
| 547 | ipov->ih_len = htons(sizeof(struct tcphdr)); |
| 548 | if (inp) { |
| 549 | ipov->ih_src = inp->inp_laddr; |
| 550 | ipov->ih_dst = inp->inp_faddr; |
| 551 | } |
| 552 | #ifdef INET6 |
| 553 | else if (in6p) { |
| 554 | /* mapped addr case */ |
| 555 | bcopy(&in6p->in6p_laddr.s6_addr32[3], &ipov->ih_src, |
| 556 | sizeof(ipov->ih_src)); |
| 557 | bcopy(&in6p->in6p_faddr.s6_addr32[3], &ipov->ih_dst, |
| 558 | sizeof(ipov->ih_dst)); |
| 559 | } |
| 560 | #endif |
| 561 | /* |
| 562 | * Compute the pseudo-header portion of the checksum |
| 563 | * now. We incrementally add in the TCP option and |
| 564 | * payload lengths later, and then compute the TCP |
| 565 | * checksum right before the packet is sent off onto |
| 566 | * the wire. |
| 567 | */ |
| 568 | n->th_sum = in_cksum_phdr(ipov->ih_src.s_addr, |
| 569 | ipov->ih_dst.s_addr, |
| 570 | htons(sizeof(struct tcphdr) + IPPROTO_TCP)); |
| 571 | break; |
| 572 | } |
| 573 | #ifdef INET6 |
| 574 | case AF_INET6: |
| 575 | { |
| 576 | struct ip6_hdr *ip6; |
| 577 | mtod(m, struct ip *)->ip_v = 6; |
| 578 | ip6 = mtod(m, struct ip6_hdr *); |
| 579 | ip6->ip6_nxt = IPPROTO_TCP; |
| 580 | ip6->ip6_plen = htons(sizeof(struct tcphdr)); |
| 581 | ip6->ip6_src = in6p->in6p_laddr; |
| 582 | ip6->ip6_dst = in6p->in6p_faddr; |
| 583 | ip6->ip6_flow = in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK; |
| 584 | if (ip6_auto_flowlabel) { |
| 585 | ip6->ip6_flow &= ~IPV6_FLOWLABEL_MASK; |
| 586 | ip6->ip6_flow |= |
| 587 | (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); |
| 588 | } |
| 589 | ip6->ip6_vfc &= ~IPV6_VERSION_MASK; |
| 590 | ip6->ip6_vfc |= IPV6_VERSION; |
| 591 | |
| 592 | /* |
| 593 | * Compute the pseudo-header portion of the checksum |
| 594 | * now. We incrementally add in the TCP option and |
| 595 | * payload lengths later, and then compute the TCP |
| 596 | * checksum right before the packet is sent off onto |
| 597 | * the wire. |
| 598 | */ |
| 599 | n->th_sum = in6_cksum_phdr(&in6p->in6p_laddr, |
| 600 | &in6p->in6p_faddr, htonl(sizeof(struct tcphdr)), |
| 601 | htonl(IPPROTO_TCP)); |
| 602 | break; |
| 603 | } |
| 604 | #endif |
| 605 | } |
| 606 | if (inp) { |
| 607 | n->th_sport = inp->inp_lport; |
| 608 | n->th_dport = inp->inp_fport; |
| 609 | } |
| 610 | #ifdef INET6 |
| 611 | else if (in6p) { |
| 612 | n->th_sport = in6p->in6p_lport; |
| 613 | n->th_dport = in6p->in6p_fport; |
| 614 | } |
| 615 | #endif |
| 616 | n->th_seq = 0; |
| 617 | n->th_ack = 0; |
| 618 | n->th_x2 = 0; |
| 619 | n->th_off = 5; |
| 620 | n->th_flags = 0; |
| 621 | n->th_win = 0; |
| 622 | n->th_urp = 0; |
| 623 | return (m); |
| 624 | } |
| 625 | |
| 626 | /* |
| 627 | * Send a single message to the TCP at address specified by |
| 628 | * the given TCP/IP header. If m == 0, then we make a copy |
| 629 | * of the tcpiphdr at ti and send directly to the addressed host. |
| 630 | * This is used to force keep alive messages out using the TCP |
| 631 | * template for a connection tp->t_template. If flags are given |
| 632 | * then we send a message back to the TCP which originated the |
| 633 | * segment ti, and discard the mbuf containing it and any other |
| 634 | * attached mbufs. |
| 635 | * |
| 636 | * In any case the ack and sequence number of the transmitted |
| 637 | * segment are as specified by the parameters. |
| 638 | */ |
| 639 | int |
| 640 | tcp_respond(struct tcpcb *tp, struct mbuf *mtemplate, struct mbuf *m, |
| 641 | struct tcphdr *th0, tcp_seq ack, tcp_seq seq, int flags) |
| 642 | { |
| 643 | struct route *ro; |
| 644 | int error, tlen, win = 0; |
| 645 | int hlen; |
| 646 | struct ip *ip; |
| 647 | #ifdef INET6 |
| 648 | struct ip6_hdr *ip6; |
| 649 | #endif |
| 650 | int family; /* family on packet, not inpcb/in6pcb! */ |
| 651 | struct tcphdr *th; |
| 652 | struct socket *so; |
| 653 | |
| 654 | if (tp != NULL && (flags & TH_RST) == 0) { |
| 655 | #ifdef DIAGNOSTIC |
| 656 | if (tp->t_inpcb && tp->t_in6pcb) |
| 657 | panic("tcp_respond: both t_inpcb and t_in6pcb are set" ); |
| 658 | #endif |
| 659 | #ifdef INET |
| 660 | if (tp->t_inpcb) |
| 661 | win = sbspace(&tp->t_inpcb->inp_socket->so_rcv); |
| 662 | #endif |
| 663 | #ifdef INET6 |
| 664 | if (tp->t_in6pcb) |
| 665 | win = sbspace(&tp->t_in6pcb->in6p_socket->so_rcv); |
| 666 | #endif |
| 667 | } |
| 668 | |
| 669 | th = NULL; /* Quell uninitialized warning */ |
| 670 | ip = NULL; |
| 671 | #ifdef INET6 |
| 672 | ip6 = NULL; |
| 673 | #endif |
| 674 | if (m == 0) { |
| 675 | if (!mtemplate) |
| 676 | return EINVAL; |
| 677 | |
| 678 | /* get family information from template */ |
| 679 | switch (mtod(mtemplate, struct ip *)->ip_v) { |
| 680 | case 4: |
| 681 | family = AF_INET; |
| 682 | hlen = sizeof(struct ip); |
| 683 | break; |
| 684 | #ifdef INET6 |
| 685 | case 6: |
| 686 | family = AF_INET6; |
| 687 | hlen = sizeof(struct ip6_hdr); |
| 688 | break; |
| 689 | #endif |
| 690 | default: |
| 691 | return EAFNOSUPPORT; |
| 692 | } |
| 693 | |
| 694 | MGETHDR(m, M_DONTWAIT, MT_HEADER); |
| 695 | if (m) { |
| 696 | MCLAIM(m, &tcp_tx_mowner); |
| 697 | MCLGET(m, M_DONTWAIT); |
| 698 | if ((m->m_flags & M_EXT) == 0) { |
| 699 | m_free(m); |
| 700 | m = NULL; |
| 701 | } |
| 702 | } |
| 703 | if (m == NULL) |
| 704 | return (ENOBUFS); |
| 705 | |
| 706 | if (tcp_compat_42) |
| 707 | tlen = 1; |
| 708 | else |
| 709 | tlen = 0; |
| 710 | |
| 711 | m->m_data += max_linkhdr; |
| 712 | bcopy(mtod(mtemplate, void *), mtod(m, void *), |
| 713 | mtemplate->m_len); |
| 714 | switch (family) { |
| 715 | case AF_INET: |
| 716 | ip = mtod(m, struct ip *); |
| 717 | th = (struct tcphdr *)(ip + 1); |
| 718 | break; |
| 719 | #ifdef INET6 |
| 720 | case AF_INET6: |
| 721 | ip6 = mtod(m, struct ip6_hdr *); |
| 722 | th = (struct tcphdr *)(ip6 + 1); |
| 723 | break; |
| 724 | #endif |
| 725 | #if 0 |
| 726 | default: |
| 727 | /* noone will visit here */ |
| 728 | m_freem(m); |
| 729 | return EAFNOSUPPORT; |
| 730 | #endif |
| 731 | } |
| 732 | flags = TH_ACK; |
| 733 | } else { |
| 734 | |
| 735 | if ((m->m_flags & M_PKTHDR) == 0) { |
| 736 | #if 0 |
| 737 | printf("non PKTHDR to tcp_respond\n" ); |
| 738 | #endif |
| 739 | m_freem(m); |
| 740 | return EINVAL; |
| 741 | } |
| 742 | #ifdef DIAGNOSTIC |
| 743 | if (!th0) |
| 744 | panic("th0 == NULL in tcp_respond" ); |
| 745 | #endif |
| 746 | |
| 747 | /* get family information from m */ |
| 748 | switch (mtod(m, struct ip *)->ip_v) { |
| 749 | case 4: |
| 750 | family = AF_INET; |
| 751 | hlen = sizeof(struct ip); |
| 752 | ip = mtod(m, struct ip *); |
| 753 | break; |
| 754 | #ifdef INET6 |
| 755 | case 6: |
| 756 | family = AF_INET6; |
| 757 | hlen = sizeof(struct ip6_hdr); |
| 758 | ip6 = mtod(m, struct ip6_hdr *); |
| 759 | break; |
| 760 | #endif |
| 761 | default: |
| 762 | m_freem(m); |
| 763 | return EAFNOSUPPORT; |
| 764 | } |
| 765 | /* clear h/w csum flags inherited from rx packet */ |
| 766 | m->m_pkthdr.csum_flags = 0; |
| 767 | |
| 768 | if ((flags & TH_SYN) == 0 || sizeof(*th0) > (th0->th_off << 2)) |
| 769 | tlen = sizeof(*th0); |
| 770 | else |
| 771 | tlen = th0->th_off << 2; |
| 772 | |
| 773 | if (m->m_len > hlen + tlen && (m->m_flags & M_EXT) == 0 && |
| 774 | mtod(m, char *) + hlen == (char *)th0) { |
| 775 | m->m_len = hlen + tlen; |
| 776 | m_freem(m->m_next); |
| 777 | m->m_next = NULL; |
| 778 | } else { |
| 779 | struct mbuf *n; |
| 780 | |
| 781 | #ifdef DIAGNOSTIC |
| 782 | if (max_linkhdr + hlen + tlen > MCLBYTES) { |
| 783 | m_freem(m); |
| 784 | return EMSGSIZE; |
| 785 | } |
| 786 | #endif |
| 787 | MGETHDR(n, M_DONTWAIT, MT_HEADER); |
| 788 | if (n && max_linkhdr + hlen + tlen > MHLEN) { |
| 789 | MCLGET(n, M_DONTWAIT); |
| 790 | if ((n->m_flags & M_EXT) == 0) { |
| 791 | m_freem(n); |
| 792 | n = NULL; |
| 793 | } |
| 794 | } |
| 795 | if (!n) { |
| 796 | m_freem(m); |
| 797 | return ENOBUFS; |
| 798 | } |
| 799 | |
| 800 | MCLAIM(n, &tcp_tx_mowner); |
| 801 | n->m_data += max_linkhdr; |
| 802 | n->m_len = hlen + tlen; |
| 803 | m_copyback(n, 0, hlen, mtod(m, void *)); |
| 804 | m_copyback(n, hlen, tlen, (void *)th0); |
| 805 | |
| 806 | m_freem(m); |
| 807 | m = n; |
| 808 | n = NULL; |
| 809 | } |
| 810 | |
| 811 | #define xchg(a,b,type) { type t; t=a; a=b; b=t; } |
| 812 | switch (family) { |
| 813 | case AF_INET: |
| 814 | ip = mtod(m, struct ip *); |
| 815 | th = (struct tcphdr *)(ip + 1); |
| 816 | ip->ip_p = IPPROTO_TCP; |
| 817 | xchg(ip->ip_dst, ip->ip_src, struct in_addr); |
| 818 | ip->ip_p = IPPROTO_TCP; |
| 819 | break; |
| 820 | #ifdef INET6 |
| 821 | case AF_INET6: |
| 822 | ip6 = mtod(m, struct ip6_hdr *); |
| 823 | th = (struct tcphdr *)(ip6 + 1); |
| 824 | ip6->ip6_nxt = IPPROTO_TCP; |
| 825 | xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr); |
| 826 | ip6->ip6_nxt = IPPROTO_TCP; |
| 827 | break; |
| 828 | #endif |
| 829 | #if 0 |
| 830 | default: |
| 831 | /* noone will visit here */ |
| 832 | m_freem(m); |
| 833 | return EAFNOSUPPORT; |
| 834 | #endif |
| 835 | } |
| 836 | xchg(th->th_dport, th->th_sport, u_int16_t); |
| 837 | #undef xchg |
| 838 | tlen = 0; /*be friendly with the following code*/ |
| 839 | } |
| 840 | th->th_seq = htonl(seq); |
| 841 | th->th_ack = htonl(ack); |
| 842 | th->th_x2 = 0; |
| 843 | if ((flags & TH_SYN) == 0) { |
| 844 | if (tp) |
| 845 | win >>= tp->rcv_scale; |
| 846 | if (win > TCP_MAXWIN) |
| 847 | win = TCP_MAXWIN; |
| 848 | th->th_win = htons((u_int16_t)win); |
| 849 | th->th_off = sizeof (struct tcphdr) >> 2; |
| 850 | tlen += sizeof(*th); |
| 851 | } else |
| 852 | tlen += th->th_off << 2; |
| 853 | m->m_len = hlen + tlen; |
| 854 | m->m_pkthdr.len = hlen + tlen; |
| 855 | m_reset_rcvif(m); |
| 856 | th->th_flags = flags; |
| 857 | th->th_urp = 0; |
| 858 | |
| 859 | switch (family) { |
| 860 | #ifdef INET |
| 861 | case AF_INET: |
| 862 | { |
| 863 | struct ipovly *ipov = (struct ipovly *)ip; |
| 864 | memset(ipov->ih_x1, 0, sizeof ipov->ih_x1); |
| 865 | ipov->ih_len = htons((u_int16_t)tlen); |
| 866 | |
| 867 | th->th_sum = 0; |
| 868 | th->th_sum = in_cksum(m, hlen + tlen); |
| 869 | ip->ip_len = htons(hlen + tlen); |
| 870 | ip->ip_ttl = ip_defttl; |
| 871 | break; |
| 872 | } |
| 873 | #endif |
| 874 | #ifdef INET6 |
| 875 | case AF_INET6: |
| 876 | { |
| 877 | th->th_sum = 0; |
| 878 | th->th_sum = in6_cksum(m, IPPROTO_TCP, sizeof(struct ip6_hdr), |
| 879 | tlen); |
| 880 | ip6->ip6_plen = htons(tlen); |
| 881 | if (tp && tp->t_in6pcb) |
| 882 | ip6->ip6_hlim = in6_selecthlim_rt(tp->t_in6pcb); |
| 883 | else |
| 884 | ip6->ip6_hlim = ip6_defhlim; |
| 885 | ip6->ip6_flow &= ~IPV6_FLOWINFO_MASK; |
| 886 | if (ip6_auto_flowlabel) { |
| 887 | ip6->ip6_flow |= |
| 888 | (htonl(ip6_randomflowlabel()) & IPV6_FLOWLABEL_MASK); |
| 889 | } |
| 890 | break; |
| 891 | } |
| 892 | #endif |
| 893 | } |
| 894 | |
| 895 | if (tp && tp->t_inpcb) |
| 896 | so = tp->t_inpcb->inp_socket; |
| 897 | #ifdef INET6 |
| 898 | else if (tp && tp->t_in6pcb) |
| 899 | so = tp->t_in6pcb->in6p_socket; |
| 900 | #endif |
| 901 | else |
| 902 | so = NULL; |
| 903 | |
| 904 | if (tp != NULL && tp->t_inpcb != NULL) { |
| 905 | ro = &tp->t_inpcb->inp_route; |
| 906 | #ifdef DIAGNOSTIC |
| 907 | if (family != AF_INET) |
| 908 | panic("tcp_respond: address family mismatch" ); |
| 909 | if (!in_hosteq(ip->ip_dst, tp->t_inpcb->inp_faddr)) { |
| 910 | panic("tcp_respond: ip_dst %x != inp_faddr %x" , |
| 911 | ntohl(ip->ip_dst.s_addr), |
| 912 | ntohl(tp->t_inpcb->inp_faddr.s_addr)); |
| 913 | } |
| 914 | #endif |
| 915 | } |
| 916 | #ifdef INET6 |
| 917 | else if (tp != NULL && tp->t_in6pcb != NULL) { |
| 918 | ro = (struct route *)&tp->t_in6pcb->in6p_route; |
| 919 | #ifdef DIAGNOSTIC |
| 920 | if (family == AF_INET) { |
| 921 | if (!IN6_IS_ADDR_V4MAPPED(&tp->t_in6pcb->in6p_faddr)) |
| 922 | panic("tcp_respond: not mapped addr" ); |
| 923 | if (memcmp(&ip->ip_dst, |
| 924 | &tp->t_in6pcb->in6p_faddr.s6_addr32[3], |
| 925 | sizeof(ip->ip_dst)) != 0) { |
| 926 | panic("tcp_respond: ip_dst != in6p_faddr" ); |
| 927 | } |
| 928 | } else if (family == AF_INET6) { |
| 929 | if (!IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, |
| 930 | &tp->t_in6pcb->in6p_faddr)) |
| 931 | panic("tcp_respond: ip6_dst != in6p_faddr" ); |
| 932 | } else |
| 933 | panic("tcp_respond: address family mismatch" ); |
| 934 | #endif |
| 935 | } |
| 936 | #endif |
| 937 | else |
| 938 | ro = NULL; |
| 939 | |
| 940 | switch (family) { |
| 941 | #ifdef INET |
| 942 | case AF_INET: |
| 943 | error = ip_output(m, NULL, ro, |
| 944 | (tp && tp->t_mtudisc ? IP_MTUDISC : 0), NULL, so); |
| 945 | break; |
| 946 | #endif |
| 947 | #ifdef INET6 |
| 948 | case AF_INET6: |
| 949 | error = ip6_output(m, NULL, ro, 0, NULL, so, NULL); |
| 950 | break; |
| 951 | #endif |
| 952 | default: |
| 953 | error = EAFNOSUPPORT; |
| 954 | break; |
| 955 | } |
| 956 | |
| 957 | return (error); |
| 958 | } |
| 959 | |
| 960 | /* |
| 961 | * Template TCPCB. Rather than zeroing a new TCPCB and initializing |
| 962 | * a bunch of members individually, we maintain this template for the |
| 963 | * static and mostly-static components of the TCPCB, and copy it into |
| 964 | * the new TCPCB instead. |
| 965 | */ |
| 966 | static struct tcpcb tcpcb_template = { |
| 967 | .t_srtt = TCPTV_SRTTBASE, |
| 968 | .t_rttmin = TCPTV_MIN, |
| 969 | |
| 970 | .snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT, |
| 971 | .snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT, |
| 972 | .snd_numholes = 0, |
| 973 | .snd_cubic_wmax = 0, |
| 974 | .snd_cubic_wmax_last = 0, |
| 975 | .snd_cubic_ctime = 0, |
| 976 | |
| 977 | .t_partialacks = -1, |
| 978 | .t_bytes_acked = 0, |
| 979 | .t_sndrexmitpack = 0, |
| 980 | .t_rcvoopack = 0, |
| 981 | .t_sndzerowin = 0, |
| 982 | }; |
| 983 | |
| 984 | /* |
| 985 | * Updates the TCPCB template whenever a parameter that would affect |
| 986 | * the template is changed. |
| 987 | */ |
| 988 | void |
| 989 | tcp_tcpcb_template(void) |
| 990 | { |
| 991 | struct tcpcb *tp = &tcpcb_template; |
| 992 | int flags; |
| 993 | |
| 994 | tp->t_peermss = tcp_mssdflt; |
| 995 | tp->t_ourmss = tcp_mssdflt; |
| 996 | tp->t_segsz = tcp_mssdflt; |
| 997 | |
| 998 | flags = 0; |
| 999 | if (tcp_do_rfc1323 && tcp_do_win_scale) |
| 1000 | flags |= TF_REQ_SCALE; |
| 1001 | if (tcp_do_rfc1323 && tcp_do_timestamps) |
| 1002 | flags |= TF_REQ_TSTMP; |
| 1003 | tp->t_flags = flags; |
| 1004 | |
| 1005 | /* |
| 1006 | * Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no |
| 1007 | * rtt estimate. Set rttvar so that srtt + 2 * rttvar gives |
| 1008 | * reasonable initial retransmit time. |
| 1009 | */ |
| 1010 | tp->t_rttvar = tcp_rttdflt * PR_SLOWHZ << (TCP_RTTVAR_SHIFT + 2 - 1); |
| 1011 | TCPT_RANGESET(tp->t_rxtcur, TCP_REXMTVAL(tp), |
| 1012 | TCPTV_MIN, TCPTV_REXMTMAX); |
| 1013 | |
| 1014 | /* Keep Alive */ |
| 1015 | tp->t_keepinit = tcp_keepinit; |
| 1016 | tp->t_keepidle = tcp_keepidle; |
| 1017 | tp->t_keepintvl = tcp_keepintvl; |
| 1018 | tp->t_keepcnt = tcp_keepcnt; |
| 1019 | tp->t_maxidle = tp->t_keepcnt * tp->t_keepintvl; |
| 1020 | |
| 1021 | /* MSL */ |
| 1022 | tp->t_msl = TCPTV_MSL; |
| 1023 | } |
| 1024 | |
| 1025 | /* |
| 1026 | * Create a new TCP control block, making an |
| 1027 | * empty reassembly queue and hooking it to the argument |
| 1028 | * protocol control block. |
| 1029 | */ |
| 1030 | /* family selects inpcb, or in6pcb */ |
| 1031 | struct tcpcb * |
| 1032 | tcp_newtcpcb(int family, void *aux) |
| 1033 | { |
| 1034 | struct tcpcb *tp; |
| 1035 | int i; |
| 1036 | |
| 1037 | /* XXX Consider using a pool_cache for speed. */ |
| 1038 | tp = pool_get(&tcpcb_pool, PR_NOWAIT); /* splsoftnet via tcp_usrreq */ |
| 1039 | if (tp == NULL) |
| 1040 | return (NULL); |
| 1041 | memcpy(tp, &tcpcb_template, sizeof(*tp)); |
| 1042 | TAILQ_INIT(&tp->segq); |
| 1043 | TAILQ_INIT(&tp->timeq); |
| 1044 | tp->t_family = family; /* may be overridden later on */ |
| 1045 | TAILQ_INIT(&tp->snd_holes); |
| 1046 | LIST_INIT(&tp->t_sc); /* XXX can template this */ |
| 1047 | |
| 1048 | /* Don't sweat this loop; hopefully the compiler will unroll it. */ |
| 1049 | for (i = 0; i < TCPT_NTIMERS; i++) { |
| 1050 | callout_init(&tp->t_timer[i], CALLOUT_MPSAFE); |
| 1051 | TCP_TIMER_INIT(tp, i); |
| 1052 | } |
| 1053 | callout_init(&tp->t_delack_ch, CALLOUT_MPSAFE); |
| 1054 | |
| 1055 | switch (family) { |
| 1056 | case AF_INET: |
| 1057 | { |
| 1058 | struct inpcb *inp = (struct inpcb *)aux; |
| 1059 | |
| 1060 | inp->inp_ip.ip_ttl = ip_defttl; |
| 1061 | inp->inp_ppcb = (void *)tp; |
| 1062 | |
| 1063 | tp->t_inpcb = inp; |
| 1064 | tp->t_mtudisc = ip_mtudisc; |
| 1065 | break; |
| 1066 | } |
| 1067 | #ifdef INET6 |
| 1068 | case AF_INET6: |
| 1069 | { |
| 1070 | struct in6pcb *in6p = (struct in6pcb *)aux; |
| 1071 | |
| 1072 | in6p->in6p_ip6.ip6_hlim = in6_selecthlim_rt(in6p); |
| 1073 | in6p->in6p_ppcb = (void *)tp; |
| 1074 | |
| 1075 | tp->t_in6pcb = in6p; |
| 1076 | /* for IPv6, always try to run path MTU discovery */ |
| 1077 | tp->t_mtudisc = 1; |
| 1078 | break; |
| 1079 | } |
| 1080 | #endif /* INET6 */ |
| 1081 | default: |
| 1082 | for (i = 0; i < TCPT_NTIMERS; i++) |
| 1083 | callout_destroy(&tp->t_timer[i]); |
| 1084 | callout_destroy(&tp->t_delack_ch); |
| 1085 | pool_put(&tcpcb_pool, tp); /* splsoftnet via tcp_usrreq */ |
| 1086 | return (NULL); |
| 1087 | } |
| 1088 | |
| 1089 | /* |
| 1090 | * Initialize our timebase. When we send timestamps, we take |
| 1091 | * the delta from tcp_now -- this means each connection always |
| 1092 | * gets a timebase of 1, which makes it, among other things, |
| 1093 | * more difficult to determine how long a system has been up, |
| 1094 | * and thus how many TCP sequence increments have occurred. |
| 1095 | * |
| 1096 | * We start with 1, because 0 doesn't work with linux, which |
| 1097 | * considers timestamp 0 in a SYN packet as a bug and disables |
| 1098 | * timestamps. |
| 1099 | */ |
| 1100 | tp->ts_timebase = tcp_now - 1; |
| 1101 | |
| 1102 | tcp_congctl_select(tp, tcp_congctl_global_name); |
| 1103 | |
| 1104 | return (tp); |
| 1105 | } |
| 1106 | |
| 1107 | /* |
| 1108 | * Drop a TCP connection, reporting |
| 1109 | * the specified error. If connection is synchronized, |
| 1110 | * then send a RST to peer. |
| 1111 | */ |
| 1112 | struct tcpcb * |
| 1113 | tcp_drop(struct tcpcb *tp, int errno) |
| 1114 | { |
| 1115 | struct socket *so = NULL; |
| 1116 | |
| 1117 | #ifdef DIAGNOSTIC |
| 1118 | if (tp->t_inpcb && tp->t_in6pcb) |
| 1119 | panic("tcp_drop: both t_inpcb and t_in6pcb are set" ); |
| 1120 | #endif |
| 1121 | #ifdef INET |
| 1122 | if (tp->t_inpcb) |
| 1123 | so = tp->t_inpcb->inp_socket; |
| 1124 | #endif |
| 1125 | #ifdef INET6 |
| 1126 | if (tp->t_in6pcb) |
| 1127 | so = tp->t_in6pcb->in6p_socket; |
| 1128 | #endif |
| 1129 | if (!so) |
| 1130 | return NULL; |
| 1131 | |
| 1132 | if (TCPS_HAVERCVDSYN(tp->t_state)) { |
| 1133 | tp->t_state = TCPS_CLOSED; |
| 1134 | (void) tcp_output(tp); |
| 1135 | TCP_STATINC(TCP_STAT_DROPS); |
| 1136 | } else |
| 1137 | TCP_STATINC(TCP_STAT_CONNDROPS); |
| 1138 | if (errno == ETIMEDOUT && tp->t_softerror) |
| 1139 | errno = tp->t_softerror; |
| 1140 | so->so_error = errno; |
| 1141 | return (tcp_close(tp)); |
| 1142 | } |
| 1143 | |
| 1144 | /* |
| 1145 | * Close a TCP control block: |
| 1146 | * discard all space held by the tcp |
| 1147 | * discard internet protocol block |
| 1148 | * wake up any sleepers |
| 1149 | */ |
| 1150 | struct tcpcb * |
| 1151 | tcp_close(struct tcpcb *tp) |
| 1152 | { |
| 1153 | struct inpcb *inp; |
| 1154 | #ifdef INET6 |
| 1155 | struct in6pcb *in6p; |
| 1156 | #endif |
| 1157 | struct socket *so; |
| 1158 | #ifdef RTV_RTT |
| 1159 | struct rtentry *rt; |
| 1160 | #endif |
| 1161 | struct route *ro; |
| 1162 | int j; |
| 1163 | |
| 1164 | inp = tp->t_inpcb; |
| 1165 | #ifdef INET6 |
| 1166 | in6p = tp->t_in6pcb; |
| 1167 | #endif |
| 1168 | so = NULL; |
| 1169 | ro = NULL; |
| 1170 | if (inp) { |
| 1171 | so = inp->inp_socket; |
| 1172 | ro = &inp->inp_route; |
| 1173 | } |
| 1174 | #ifdef INET6 |
| 1175 | else if (in6p) { |
| 1176 | so = in6p->in6p_socket; |
| 1177 | ro = (struct route *)&in6p->in6p_route; |
| 1178 | } |
| 1179 | #endif |
| 1180 | |
| 1181 | #ifdef RTV_RTT |
| 1182 | /* |
| 1183 | * If we sent enough data to get some meaningful characteristics, |
| 1184 | * save them in the routing entry. 'Enough' is arbitrarily |
| 1185 | * defined as the sendpipesize (default 4K) * 16. This would |
| 1186 | * give us 16 rtt samples assuming we only get one sample per |
| 1187 | * window (the usual case on a long haul net). 16 samples is |
| 1188 | * enough for the srtt filter to converge to within 5% of the correct |
| 1189 | * value; fewer samples and we could save a very bogus rtt. |
| 1190 | * |
| 1191 | * Don't update the default route's characteristics and don't |
| 1192 | * update anything that the user "locked". |
| 1193 | */ |
| 1194 | if (SEQ_LT(tp->iss + so->so_snd.sb_hiwat * 16, tp->snd_max) && |
| 1195 | ro && (rt = rtcache_validate(ro)) != NULL && |
| 1196 | !in_nullhost(satocsin(rt_getkey(rt))->sin_addr)) { |
| 1197 | u_long i = 0; |
| 1198 | |
| 1199 | if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) { |
| 1200 | i = tp->t_srtt * |
| 1201 | ((RTM_RTTUNIT / PR_SLOWHZ) >> (TCP_RTT_SHIFT + 2)); |
| 1202 | if (rt->rt_rmx.rmx_rtt && i) |
| 1203 | /* |
| 1204 | * filter this update to half the old & half |
| 1205 | * the new values, converting scale. |
| 1206 | * See route.h and tcp_var.h for a |
| 1207 | * description of the scaling constants. |
| 1208 | */ |
| 1209 | rt->rt_rmx.rmx_rtt = |
| 1210 | (rt->rt_rmx.rmx_rtt + i) / 2; |
| 1211 | else |
| 1212 | rt->rt_rmx.rmx_rtt = i; |
| 1213 | } |
| 1214 | if ((rt->rt_rmx.rmx_locks & RTV_RTTVAR) == 0) { |
| 1215 | i = tp->t_rttvar * |
| 1216 | ((RTM_RTTUNIT / PR_SLOWHZ) >> (TCP_RTTVAR_SHIFT + 2)); |
| 1217 | if (rt->rt_rmx.rmx_rttvar && i) |
| 1218 | rt->rt_rmx.rmx_rttvar = |
| 1219 | (rt->rt_rmx.rmx_rttvar + i) / 2; |
| 1220 | else |
| 1221 | rt->rt_rmx.rmx_rttvar = i; |
| 1222 | } |
| 1223 | /* |
| 1224 | * update the pipelimit (ssthresh) if it has been updated |
| 1225 | * already or if a pipesize was specified & the threshhold |
| 1226 | * got below half the pipesize. I.e., wait for bad news |
| 1227 | * before we start updating, then update on both good |
| 1228 | * and bad news. |
| 1229 | */ |
| 1230 | if (((rt->rt_rmx.rmx_locks & RTV_SSTHRESH) == 0 && |
| 1231 | (i = tp->snd_ssthresh) && rt->rt_rmx.rmx_ssthresh) || |
| 1232 | i < (rt->rt_rmx.rmx_sendpipe / 2)) { |
| 1233 | /* |
| 1234 | * convert the limit from user data bytes to |
| 1235 | * packets then to packet data bytes. |
| 1236 | */ |
| 1237 | i = (i + tp->t_segsz / 2) / tp->t_segsz; |
| 1238 | if (i < 2) |
| 1239 | i = 2; |
| 1240 | i *= (u_long)(tp->t_segsz + sizeof (struct tcpiphdr)); |
| 1241 | if (rt->rt_rmx.rmx_ssthresh) |
| 1242 | rt->rt_rmx.rmx_ssthresh = |
| 1243 | (rt->rt_rmx.rmx_ssthresh + i) / 2; |
| 1244 | else |
| 1245 | rt->rt_rmx.rmx_ssthresh = i; |
| 1246 | } |
| 1247 | } |
| 1248 | #endif /* RTV_RTT */ |
| 1249 | /* free the reassembly queue, if any */ |
| 1250 | TCP_REASS_LOCK(tp); |
| 1251 | (void) tcp_freeq(tp); |
| 1252 | TCP_REASS_UNLOCK(tp); |
| 1253 | |
| 1254 | /* free the SACK holes list. */ |
| 1255 | tcp_free_sackholes(tp); |
| 1256 | tcp_congctl_release(tp); |
| 1257 | syn_cache_cleanup(tp); |
| 1258 | |
| 1259 | if (tp->t_template) { |
| 1260 | m_free(tp->t_template); |
| 1261 | tp->t_template = NULL; |
| 1262 | } |
| 1263 | |
| 1264 | /* |
| 1265 | * Detaching the pcb will unlock the socket/tcpcb, and stopping |
| 1266 | * the timers can also drop the lock. We need to prevent access |
| 1267 | * to the tcpcb as it's half torn down. Flag the pcb as dead |
| 1268 | * (prevents access by timers) and only then detach it. |
| 1269 | */ |
| 1270 | tp->t_flags |= TF_DEAD; |
| 1271 | if (inp) { |
| 1272 | inp->inp_ppcb = 0; |
| 1273 | soisdisconnected(so); |
| 1274 | in_pcbdetach(inp); |
| 1275 | } |
| 1276 | #ifdef INET6 |
| 1277 | else if (in6p) { |
| 1278 | in6p->in6p_ppcb = 0; |
| 1279 | soisdisconnected(so); |
| 1280 | in6_pcbdetach(in6p); |
| 1281 | } |
| 1282 | #endif |
| 1283 | /* |
| 1284 | * pcb is no longer visble elsewhere, so we can safely release |
| 1285 | * the lock in callout_halt() if needed. |
| 1286 | */ |
| 1287 | TCP_STATINC(TCP_STAT_CLOSED); |
| 1288 | for (j = 0; j < TCPT_NTIMERS; j++) { |
| 1289 | callout_halt(&tp->t_timer[j], softnet_lock); |
| 1290 | callout_destroy(&tp->t_timer[j]); |
| 1291 | } |
| 1292 | callout_halt(&tp->t_delack_ch, softnet_lock); |
| 1293 | callout_destroy(&tp->t_delack_ch); |
| 1294 | pool_put(&tcpcb_pool, tp); |
| 1295 | |
| 1296 | return NULL; |
| 1297 | } |
| 1298 | |
| 1299 | int |
| 1300 | tcp_freeq(struct tcpcb *tp) |
| 1301 | { |
| 1302 | struct ipqent *qe; |
| 1303 | int rv = 0; |
| 1304 | #ifdef TCPREASS_DEBUG |
| 1305 | int i = 0; |
| 1306 | #endif |
| 1307 | |
| 1308 | TCP_REASS_LOCK_CHECK(tp); |
| 1309 | |
| 1310 | while ((qe = TAILQ_FIRST(&tp->segq)) != NULL) { |
| 1311 | #ifdef TCPREASS_DEBUG |
| 1312 | printf("tcp_freeq[%p,%d]: %u:%u(%u) 0x%02x\n" , |
| 1313 | tp, i++, qe->ipqe_seq, qe->ipqe_seq + qe->ipqe_len, |
| 1314 | qe->ipqe_len, qe->ipqe_flags & (TH_SYN|TH_FIN|TH_RST)); |
| 1315 | #endif |
| 1316 | TAILQ_REMOVE(&tp->segq, qe, ipqe_q); |
| 1317 | TAILQ_REMOVE(&tp->timeq, qe, ipqe_timeq); |
| 1318 | m_freem(qe->ipqe_m); |
| 1319 | tcpipqent_free(qe); |
| 1320 | rv = 1; |
| 1321 | } |
| 1322 | tp->t_segqlen = 0; |
| 1323 | KASSERT(TAILQ_EMPTY(&tp->timeq)); |
| 1324 | return (rv); |
| 1325 | } |
| 1326 | |
| 1327 | void |
| 1328 | tcp_fasttimo(void) |
| 1329 | { |
| 1330 | if (tcp_drainwanted) { |
| 1331 | tcp_drain(); |
| 1332 | tcp_drainwanted = 0; |
| 1333 | } |
| 1334 | } |
| 1335 | |
| 1336 | void |
| 1337 | tcp_drainstub(void) |
| 1338 | { |
| 1339 | tcp_drainwanted = 1; |
| 1340 | } |
| 1341 | |
| 1342 | /* |
| 1343 | * Protocol drain routine. Called when memory is in short supply. |
| 1344 | * Called from pr_fasttimo thus a callout context. |
| 1345 | */ |
| 1346 | void |
| 1347 | tcp_drain(void) |
| 1348 | { |
| 1349 | struct inpcb_hdr *inph; |
| 1350 | struct tcpcb *tp; |
| 1351 | |
| 1352 | mutex_enter(softnet_lock); |
| 1353 | KERNEL_LOCK(1, NULL); |
| 1354 | |
| 1355 | /* |
| 1356 | * Free the sequence queue of all TCP connections. |
| 1357 | */ |
| 1358 | TAILQ_FOREACH(inph, &tcbtable.inpt_queue, inph_queue) { |
| 1359 | switch (inph->inph_af) { |
| 1360 | case AF_INET: |
| 1361 | tp = intotcpcb((struct inpcb *)inph); |
| 1362 | break; |
| 1363 | #ifdef INET6 |
| 1364 | case AF_INET6: |
| 1365 | tp = in6totcpcb((struct in6pcb *)inph); |
| 1366 | break; |
| 1367 | #endif |
| 1368 | default: |
| 1369 | tp = NULL; |
| 1370 | break; |
| 1371 | } |
| 1372 | if (tp != NULL) { |
| 1373 | /* |
| 1374 | * We may be called from a device's interrupt |
| 1375 | * context. If the tcpcb is already busy, |
| 1376 | * just bail out now. |
| 1377 | */ |
| 1378 | if (tcp_reass_lock_try(tp) == 0) |
| 1379 | continue; |
| 1380 | if (tcp_freeq(tp)) |
| 1381 | TCP_STATINC(TCP_STAT_CONNSDRAINED); |
| 1382 | TCP_REASS_UNLOCK(tp); |
| 1383 | } |
| 1384 | } |
| 1385 | |
| 1386 | KERNEL_UNLOCK_ONE(NULL); |
| 1387 | mutex_exit(softnet_lock); |
| 1388 | } |
| 1389 | |
| 1390 | /* |
| 1391 | * Notify a tcp user of an asynchronous error; |
| 1392 | * store error as soft error, but wake up user |
| 1393 | * (for now, won't do anything until can select for soft error). |
| 1394 | */ |
| 1395 | void |
| 1396 | tcp_notify(struct inpcb *inp, int error) |
| 1397 | { |
| 1398 | struct tcpcb *tp = (struct tcpcb *)inp->inp_ppcb; |
| 1399 | struct socket *so = inp->inp_socket; |
| 1400 | |
| 1401 | /* |
| 1402 | * Ignore some errors if we are hooked up. |
| 1403 | * If connection hasn't completed, has retransmitted several times, |
| 1404 | * and receives a second error, give up now. This is better |
| 1405 | * than waiting a long time to establish a connection that |
| 1406 | * can never complete. |
| 1407 | */ |
| 1408 | if (tp->t_state == TCPS_ESTABLISHED && |
| 1409 | (error == EHOSTUNREACH || error == ENETUNREACH || |
| 1410 | error == EHOSTDOWN)) { |
| 1411 | return; |
| 1412 | } else if (TCPS_HAVEESTABLISHED(tp->t_state) == 0 && |
| 1413 | tp->t_rxtshift > 3 && tp->t_softerror) |
| 1414 | so->so_error = error; |
| 1415 | else |
| 1416 | tp->t_softerror = error; |
| 1417 | cv_broadcast(&so->so_cv); |
| 1418 | sorwakeup(so); |
| 1419 | sowwakeup(so); |
| 1420 | } |
| 1421 | |
| 1422 | #ifdef INET6 |
| 1423 | void |
| 1424 | tcp6_notify(struct in6pcb *in6p, int error) |
| 1425 | { |
| 1426 | struct tcpcb *tp = (struct tcpcb *)in6p->in6p_ppcb; |
| 1427 | struct socket *so = in6p->in6p_socket; |
| 1428 | |
| 1429 | /* |
| 1430 | * Ignore some errors if we are hooked up. |
| 1431 | * If connection hasn't completed, has retransmitted several times, |
| 1432 | * and receives a second error, give up now. This is better |
| 1433 | * than waiting a long time to establish a connection that |
| 1434 | * can never complete. |
| 1435 | */ |
| 1436 | if (tp->t_state == TCPS_ESTABLISHED && |
| 1437 | (error == EHOSTUNREACH || error == ENETUNREACH || |
| 1438 | error == EHOSTDOWN)) { |
| 1439 | return; |
| 1440 | } else if (TCPS_HAVEESTABLISHED(tp->t_state) == 0 && |
| 1441 | tp->t_rxtshift > 3 && tp->t_softerror) |
| 1442 | so->so_error = error; |
| 1443 | else |
| 1444 | tp->t_softerror = error; |
| 1445 | cv_broadcast(&so->so_cv); |
| 1446 | sorwakeup(so); |
| 1447 | sowwakeup(so); |
| 1448 | } |
| 1449 | #endif |
| 1450 | |
| 1451 | #ifdef INET6 |
| 1452 | void * |
| 1453 | tcp6_ctlinput(int cmd, const struct sockaddr *sa, void *d) |
| 1454 | { |
| 1455 | struct tcphdr th; |
| 1456 | void (*notify)(struct in6pcb *, int) = tcp6_notify; |
| 1457 | int nmatch; |
| 1458 | struct ip6_hdr *ip6; |
| 1459 | const struct sockaddr_in6 *sa6_src = NULL; |
| 1460 | const struct sockaddr_in6 *sa6 = (const struct sockaddr_in6 *)sa; |
| 1461 | struct mbuf *m; |
| 1462 | int off; |
| 1463 | |
| 1464 | if (sa->sa_family != AF_INET6 || |
| 1465 | sa->sa_len != sizeof(struct sockaddr_in6)) |
| 1466 | return NULL; |
| 1467 | if ((unsigned)cmd >= PRC_NCMDS) |
| 1468 | return NULL; |
| 1469 | else if (cmd == PRC_QUENCH) { |
| 1470 | /* |
| 1471 | * Don't honor ICMP Source Quench messages meant for |
| 1472 | * TCP connections. |
| 1473 | */ |
| 1474 | return NULL; |
| 1475 | } else if (PRC_IS_REDIRECT(cmd)) |
| 1476 | notify = in6_rtchange, d = NULL; |
| 1477 | else if (cmd == PRC_MSGSIZE) |
| 1478 | ; /* special code is present, see below */ |
| 1479 | else if (cmd == PRC_HOSTDEAD) |
| 1480 | d = NULL; |
| 1481 | else if (inet6ctlerrmap[cmd] == 0) |
| 1482 | return NULL; |
| 1483 | |
| 1484 | /* if the parameter is from icmp6, decode it. */ |
| 1485 | if (d != NULL) { |
| 1486 | struct ip6ctlparam *ip6cp = (struct ip6ctlparam *)d; |
| 1487 | m = ip6cp->ip6c_m; |
| 1488 | ip6 = ip6cp->ip6c_ip6; |
| 1489 | off = ip6cp->ip6c_off; |
| 1490 | sa6_src = ip6cp->ip6c_src; |
| 1491 | } else { |
| 1492 | m = NULL; |
| 1493 | ip6 = NULL; |
| 1494 | sa6_src = &sa6_any; |
| 1495 | off = 0; |
| 1496 | } |
| 1497 | |
| 1498 | if (ip6) { |
| 1499 | /* |
| 1500 | * XXX: We assume that when ip6 is non NULL, |
| 1501 | * M and OFF are valid. |
| 1502 | */ |
| 1503 | |
| 1504 | /* check if we can safely examine src and dst ports */ |
| 1505 | if (m->m_pkthdr.len < off + sizeof(th)) { |
| 1506 | if (cmd == PRC_MSGSIZE) |
| 1507 | icmp6_mtudisc_update((struct ip6ctlparam *)d, 0); |
| 1508 | return NULL; |
| 1509 | } |
| 1510 | |
| 1511 | memset(&th, 0, sizeof(th)); |
| 1512 | m_copydata(m, off, sizeof(th), (void *)&th); |
| 1513 | |
| 1514 | if (cmd == PRC_MSGSIZE) { |
| 1515 | int valid = 0; |
| 1516 | |
| 1517 | /* |
| 1518 | * Check to see if we have a valid TCP connection |
| 1519 | * corresponding to the address in the ICMPv6 message |
| 1520 | * payload. |
| 1521 | */ |
| 1522 | if (in6_pcblookup_connect(&tcbtable, &sa6->sin6_addr, |
| 1523 | th.th_dport, |
| 1524 | (const struct in6_addr *)&sa6_src->sin6_addr, |
| 1525 | th.th_sport, 0, 0)) |
| 1526 | valid++; |
| 1527 | |
| 1528 | /* |
| 1529 | * Depending on the value of "valid" and routing table |
| 1530 | * size (mtudisc_{hi,lo}wat), we will: |
| 1531 | * - recalcurate the new MTU and create the |
| 1532 | * corresponding routing entry, or |
| 1533 | * - ignore the MTU change notification. |
| 1534 | */ |
| 1535 | icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); |
| 1536 | |
| 1537 | /* |
| 1538 | * no need to call in6_pcbnotify, it should have been |
| 1539 | * called via callback if necessary |
| 1540 | */ |
| 1541 | return NULL; |
| 1542 | } |
| 1543 | |
| 1544 | nmatch = in6_pcbnotify(&tcbtable, sa, th.th_dport, |
| 1545 | (const struct sockaddr *)sa6_src, th.th_sport, cmd, NULL, notify); |
| 1546 | if (nmatch == 0 && syn_cache_count && |
| 1547 | (inet6ctlerrmap[cmd] == EHOSTUNREACH || |
| 1548 | inet6ctlerrmap[cmd] == ENETUNREACH || |
| 1549 | inet6ctlerrmap[cmd] == EHOSTDOWN)) |
| 1550 | syn_cache_unreach((const struct sockaddr *)sa6_src, |
| 1551 | sa, &th); |
| 1552 | } else { |
| 1553 | (void) in6_pcbnotify(&tcbtable, sa, 0, |
| 1554 | (const struct sockaddr *)sa6_src, 0, cmd, NULL, notify); |
| 1555 | } |
| 1556 | |
| 1557 | return NULL; |
| 1558 | } |
| 1559 | #endif |
| 1560 | |
| 1561 | #ifdef INET |
| 1562 | /* assumes that ip header and tcp header are contiguous on mbuf */ |
| 1563 | void * |
| 1564 | tcp_ctlinput(int cmd, const struct sockaddr *sa, void *v) |
| 1565 | { |
| 1566 | struct ip *ip = v; |
| 1567 | struct tcphdr *th; |
| 1568 | struct icmp *icp; |
| 1569 | extern const int inetctlerrmap[]; |
| 1570 | void (*notify)(struct inpcb *, int) = tcp_notify; |
| 1571 | int errno; |
| 1572 | int nmatch; |
| 1573 | struct tcpcb *tp; |
| 1574 | u_int mtu; |
| 1575 | tcp_seq seq; |
| 1576 | struct inpcb *inp; |
| 1577 | #ifdef INET6 |
| 1578 | struct in6pcb *in6p; |
| 1579 | struct in6_addr src6, dst6; |
| 1580 | #endif |
| 1581 | |
| 1582 | if (sa->sa_family != AF_INET || |
| 1583 | sa->sa_len != sizeof(struct sockaddr_in)) |
| 1584 | return NULL; |
| 1585 | if ((unsigned)cmd >= PRC_NCMDS) |
| 1586 | return NULL; |
| 1587 | errno = inetctlerrmap[cmd]; |
| 1588 | if (cmd == PRC_QUENCH) |
| 1589 | /* |
| 1590 | * Don't honor ICMP Source Quench messages meant for |
| 1591 | * TCP connections. |
| 1592 | */ |
| 1593 | return NULL; |
| 1594 | else if (PRC_IS_REDIRECT(cmd)) |
| 1595 | notify = in_rtchange, ip = 0; |
| 1596 | else if (cmd == PRC_MSGSIZE && ip && ip->ip_v == 4) { |
| 1597 | /* |
| 1598 | * Check to see if we have a valid TCP connection |
| 1599 | * corresponding to the address in the ICMP message |
| 1600 | * payload. |
| 1601 | * |
| 1602 | * Boundary check is made in icmp_input(), with ICMP_ADVLENMIN. |
| 1603 | */ |
| 1604 | th = (struct tcphdr *)((char *)ip + (ip->ip_hl << 2)); |
| 1605 | #ifdef INET6 |
| 1606 | in6_in_2_v4mapin6(&ip->ip_src, &src6); |
| 1607 | in6_in_2_v4mapin6(&ip->ip_dst, &dst6); |
| 1608 | #endif |
| 1609 | if ((inp = in_pcblookup_connect(&tcbtable, ip->ip_dst, |
| 1610 | th->th_dport, ip->ip_src, th->th_sport, 0)) != NULL) |
| 1611 | #ifdef INET6 |
| 1612 | in6p = NULL; |
| 1613 | #else |
| 1614 | ; |
| 1615 | #endif |
| 1616 | #ifdef INET6 |
| 1617 | else if ((in6p = in6_pcblookup_connect(&tcbtable, &dst6, |
| 1618 | th->th_dport, &src6, th->th_sport, 0, 0)) != NULL) |
| 1619 | ; |
| 1620 | #endif |
| 1621 | else |
| 1622 | return NULL; |
| 1623 | |
| 1624 | /* |
| 1625 | * Now that we've validated that we are actually communicating |
| 1626 | * with the host indicated in the ICMP message, locate the |
| 1627 | * ICMP header, recalculate the new MTU, and create the |
| 1628 | * corresponding routing entry. |
| 1629 | */ |
| 1630 | icp = (struct icmp *)((char *)ip - |
| 1631 | offsetof(struct icmp, icmp_ip)); |
| 1632 | if (inp) { |
| 1633 | if ((tp = intotcpcb(inp)) == NULL) |
| 1634 | return NULL; |
| 1635 | } |
| 1636 | #ifdef INET6 |
| 1637 | else if (in6p) { |
| 1638 | if ((tp = in6totcpcb(in6p)) == NULL) |
| 1639 | return NULL; |
| 1640 | } |
| 1641 | #endif |
| 1642 | else |
| 1643 | return NULL; |
| 1644 | seq = ntohl(th->th_seq); |
| 1645 | if (SEQ_LT(seq, tp->snd_una) || SEQ_GT(seq, tp->snd_max)) |
| 1646 | return NULL; |
| 1647 | /* |
| 1648 | * If the ICMP message advertises a Next-Hop MTU |
| 1649 | * equal or larger than the maximum packet size we have |
| 1650 | * ever sent, drop the message. |
| 1651 | */ |
| 1652 | mtu = (u_int)ntohs(icp->icmp_nextmtu); |
| 1653 | if (mtu >= tp->t_pmtud_mtu_sent) |
| 1654 | return NULL; |
| 1655 | if (mtu >= tcp_hdrsz(tp) + tp->t_pmtud_mss_acked) { |
| 1656 | /* |
| 1657 | * Calculate new MTU, and create corresponding |
| 1658 | * route (traditional PMTUD). |
| 1659 | */ |
| 1660 | tp->t_flags &= ~TF_PMTUD_PEND; |
| 1661 | icmp_mtudisc(icp, ip->ip_dst); |
| 1662 | } else { |
| 1663 | /* |
| 1664 | * Record the information got in the ICMP |
| 1665 | * message; act on it later. |
| 1666 | * If we had already recorded an ICMP message, |
| 1667 | * replace the old one only if the new message |
| 1668 | * refers to an older TCP segment |
| 1669 | */ |
| 1670 | if (tp->t_flags & TF_PMTUD_PEND) { |
| 1671 | if (SEQ_LT(tp->t_pmtud_th_seq, seq)) |
| 1672 | return NULL; |
| 1673 | } else |
| 1674 | tp->t_flags |= TF_PMTUD_PEND; |
| 1675 | tp->t_pmtud_th_seq = seq; |
| 1676 | tp->t_pmtud_nextmtu = icp->icmp_nextmtu; |
| 1677 | tp->t_pmtud_ip_len = icp->icmp_ip.ip_len; |
| 1678 | tp->t_pmtud_ip_hl = icp->icmp_ip.ip_hl; |
| 1679 | } |
| 1680 | return NULL; |
| 1681 | } else if (cmd == PRC_HOSTDEAD) |
| 1682 | ip = 0; |
| 1683 | else if (errno == 0) |
| 1684 | return NULL; |
| 1685 | if (ip && ip->ip_v == 4 && sa->sa_family == AF_INET) { |
| 1686 | th = (struct tcphdr *)((char *)ip + (ip->ip_hl << 2)); |
| 1687 | nmatch = in_pcbnotify(&tcbtable, satocsin(sa)->sin_addr, |
| 1688 | th->th_dport, ip->ip_src, th->th_sport, errno, notify); |
| 1689 | if (nmatch == 0 && syn_cache_count && |
| 1690 | (inetctlerrmap[cmd] == EHOSTUNREACH || |
| 1691 | inetctlerrmap[cmd] == ENETUNREACH || |
| 1692 | inetctlerrmap[cmd] == EHOSTDOWN)) { |
| 1693 | struct sockaddr_in sin; |
| 1694 | memset(&sin, 0, sizeof(sin)); |
| 1695 | sin.sin_len = sizeof(sin); |
| 1696 | sin.sin_family = AF_INET; |
| 1697 | sin.sin_port = th->th_sport; |
| 1698 | sin.sin_addr = ip->ip_src; |
| 1699 | syn_cache_unreach((struct sockaddr *)&sin, sa, th); |
| 1700 | } |
| 1701 | |
| 1702 | /* XXX mapped address case */ |
| 1703 | } else |
| 1704 | in_pcbnotifyall(&tcbtable, satocsin(sa)->sin_addr, errno, |
| 1705 | notify); |
| 1706 | return NULL; |
| 1707 | } |
| 1708 | |
| 1709 | /* |
| 1710 | * When a source quench is received, we are being notified of congestion. |
| 1711 | * Close the congestion window down to the Loss Window (one segment). |
| 1712 | * We will gradually open it again as we proceed. |
| 1713 | */ |
| 1714 | void |
| 1715 | tcp_quench(struct inpcb *inp, int errno) |
| 1716 | { |
| 1717 | struct tcpcb *tp = intotcpcb(inp); |
| 1718 | |
| 1719 | if (tp) { |
| 1720 | tp->snd_cwnd = tp->t_segsz; |
| 1721 | tp->t_bytes_acked = 0; |
| 1722 | } |
| 1723 | } |
| 1724 | #endif |
| 1725 | |
| 1726 | #ifdef INET6 |
| 1727 | void |
| 1728 | tcp6_quench(struct in6pcb *in6p, int errno) |
| 1729 | { |
| 1730 | struct tcpcb *tp = in6totcpcb(in6p); |
| 1731 | |
| 1732 | if (tp) { |
| 1733 | tp->snd_cwnd = tp->t_segsz; |
| 1734 | tp->t_bytes_acked = 0; |
| 1735 | } |
| 1736 | } |
| 1737 | #endif |
| 1738 | |
| 1739 | #ifdef INET |
| 1740 | /* |
| 1741 | * Path MTU Discovery handlers. |
| 1742 | */ |
| 1743 | void |
| 1744 | tcp_mtudisc_callback(struct in_addr faddr) |
| 1745 | { |
| 1746 | #ifdef INET6 |
| 1747 | struct in6_addr in6; |
| 1748 | #endif |
| 1749 | |
| 1750 | in_pcbnotifyall(&tcbtable, faddr, EMSGSIZE, tcp_mtudisc); |
| 1751 | #ifdef INET6 |
| 1752 | in6_in_2_v4mapin6(&faddr, &in6); |
| 1753 | tcp6_mtudisc_callback(&in6); |
| 1754 | #endif |
| 1755 | } |
| 1756 | |
| 1757 | /* |
| 1758 | * On receipt of path MTU corrections, flush old route and replace it |
| 1759 | * with the new one. Retransmit all unacknowledged packets, to ensure |
| 1760 | * that all packets will be received. |
| 1761 | */ |
| 1762 | void |
| 1763 | tcp_mtudisc(struct inpcb *inp, int errno) |
| 1764 | { |
| 1765 | struct tcpcb *tp = intotcpcb(inp); |
| 1766 | struct rtentry *rt; |
| 1767 | |
| 1768 | if (tp == NULL) |
| 1769 | return; |
| 1770 | |
| 1771 | rt = in_pcbrtentry(inp); |
| 1772 | if (rt != NULL) { |
| 1773 | /* |
| 1774 | * If this was not a host route, remove and realloc. |
| 1775 | */ |
| 1776 | if ((rt->rt_flags & RTF_HOST) == 0) { |
| 1777 | in_rtchange(inp, errno); |
| 1778 | if ((rt = in_pcbrtentry(inp)) == NULL) |
| 1779 | return; |
| 1780 | } |
| 1781 | |
| 1782 | /* |
| 1783 | * Slow start out of the error condition. We |
| 1784 | * use the MTU because we know it's smaller |
| 1785 | * than the previously transmitted segment. |
| 1786 | * |
| 1787 | * Note: This is more conservative than the |
| 1788 | * suggestion in draft-floyd-incr-init-win-03. |
| 1789 | */ |
| 1790 | if (rt->rt_rmx.rmx_mtu != 0) |
| 1791 | tp->snd_cwnd = |
| 1792 | TCP_INITIAL_WINDOW(tcp_init_win, |
| 1793 | rt->rt_rmx.rmx_mtu); |
| 1794 | } |
| 1795 | |
| 1796 | /* |
| 1797 | * Resend unacknowledged packets. |
| 1798 | */ |
| 1799 | tp->snd_nxt = tp->sack_newdata = tp->snd_una; |
| 1800 | tcp_output(tp); |
| 1801 | } |
| 1802 | #endif /* INET */ |
| 1803 | |
| 1804 | #ifdef INET6 |
| 1805 | /* |
| 1806 | * Path MTU Discovery handlers. |
| 1807 | */ |
| 1808 | void |
| 1809 | tcp6_mtudisc_callback(struct in6_addr *faddr) |
| 1810 | { |
| 1811 | struct sockaddr_in6 sin6; |
| 1812 | |
| 1813 | memset(&sin6, 0, sizeof(sin6)); |
| 1814 | sin6.sin6_family = AF_INET6; |
| 1815 | sin6.sin6_len = sizeof(struct sockaddr_in6); |
| 1816 | sin6.sin6_addr = *faddr; |
| 1817 | (void) in6_pcbnotify(&tcbtable, (struct sockaddr *)&sin6, 0, |
| 1818 | (const struct sockaddr *)&sa6_any, 0, PRC_MSGSIZE, NULL, tcp6_mtudisc); |
| 1819 | } |
| 1820 | |
| 1821 | void |
| 1822 | tcp6_mtudisc(struct in6pcb *in6p, int errno) |
| 1823 | { |
| 1824 | struct tcpcb *tp = in6totcpcb(in6p); |
| 1825 | struct rtentry *rt; |
| 1826 | |
| 1827 | if (tp == NULL) |
| 1828 | return; |
| 1829 | |
| 1830 | rt = in6_pcbrtentry(in6p); |
| 1831 | if (rt != NULL) { |
| 1832 | /* |
| 1833 | * If this was not a host route, remove and realloc. |
| 1834 | */ |
| 1835 | if ((rt->rt_flags & RTF_HOST) == 0) { |
| 1836 | in6_rtchange(in6p, errno); |
| 1837 | rt = in6_pcbrtentry(in6p); |
| 1838 | if (rt == NULL) |
| 1839 | return; |
| 1840 | } |
| 1841 | |
| 1842 | /* |
| 1843 | * Slow start out of the error condition. We |
| 1844 | * use the MTU because we know it's smaller |
| 1845 | * than the previously transmitted segment. |
| 1846 | * |
| 1847 | * Note: This is more conservative than the |
| 1848 | * suggestion in draft-floyd-incr-init-win-03. |
| 1849 | */ |
| 1850 | if (rt->rt_rmx.rmx_mtu != 0) { |
| 1851 | tp->snd_cwnd = TCP_INITIAL_WINDOW(tcp_init_win, |
| 1852 | rt->rt_rmx.rmx_mtu); |
| 1853 | } |
| 1854 | } |
| 1855 | |
| 1856 | /* |
| 1857 | * Resend unacknowledged packets. |
| 1858 | */ |
| 1859 | tp->snd_nxt = tp->sack_newdata = tp->snd_una; |
| 1860 | tcp_output(tp); |
| 1861 | } |
| 1862 | #endif /* INET6 */ |
| 1863 | |
| 1864 | /* |
| 1865 | * Compute the MSS to advertise to the peer. Called only during |
| 1866 | * the 3-way handshake. If we are the server (peer initiated |
| 1867 | * connection), we are called with a pointer to the interface |
| 1868 | * on which the SYN packet arrived. If we are the client (we |
| 1869 | * initiated connection), we are called with a pointer to the |
| 1870 | * interface out which this connection should go. |
| 1871 | * |
| 1872 | * NOTE: Do not subtract IP option/extension header size nor IPsec |
| 1873 | * header size from MSS advertisement. MSS option must hold the maximum |
| 1874 | * segment size we can accept, so it must always be: |
| 1875 | * max(if mtu) - ip header - tcp header |
| 1876 | */ |
| 1877 | u_long |
| 1878 | tcp_mss_to_advertise(const struct ifnet *ifp, int af) |
| 1879 | { |
| 1880 | extern u_long in_maxmtu; |
| 1881 | u_long mss = 0; |
| 1882 | u_long hdrsiz; |
| 1883 | |
| 1884 | /* |
| 1885 | * In order to avoid defeating path MTU discovery on the peer, |
| 1886 | * we advertise the max MTU of all attached networks as our MSS, |
| 1887 | * per RFC 1191, section 3.1. |
| 1888 | * |
| 1889 | * We provide the option to advertise just the MTU of |
| 1890 | * the interface on which we hope this connection will |
| 1891 | * be receiving. If we are responding to a SYN, we |
| 1892 | * will have a pretty good idea about this, but when |
| 1893 | * initiating a connection there is a bit more doubt. |
| 1894 | * |
| 1895 | * We also need to ensure that loopback has a large enough |
| 1896 | * MSS, as the loopback MTU is never included in in_maxmtu. |
| 1897 | */ |
| 1898 | |
| 1899 | if (ifp != NULL) |
| 1900 | switch (af) { |
| 1901 | case AF_INET: |
| 1902 | mss = ifp->if_mtu; |
| 1903 | break; |
| 1904 | #ifdef INET6 |
| 1905 | case AF_INET6: |
| 1906 | mss = IN6_LINKMTU(ifp); |
| 1907 | break; |
| 1908 | #endif |
| 1909 | } |
| 1910 | |
| 1911 | if (tcp_mss_ifmtu == 0) |
| 1912 | switch (af) { |
| 1913 | case AF_INET: |
| 1914 | mss = max(in_maxmtu, mss); |
| 1915 | break; |
| 1916 | #ifdef INET6 |
| 1917 | case AF_INET6: |
| 1918 | mss = max(in6_maxmtu, mss); |
| 1919 | break; |
| 1920 | #endif |
| 1921 | } |
| 1922 | |
| 1923 | switch (af) { |
| 1924 | case AF_INET: |
| 1925 | hdrsiz = sizeof(struct ip); |
| 1926 | break; |
| 1927 | #ifdef INET6 |
| 1928 | case AF_INET6: |
| 1929 | hdrsiz = sizeof(struct ip6_hdr); |
| 1930 | break; |
| 1931 | #endif |
| 1932 | default: |
| 1933 | hdrsiz = 0; |
| 1934 | break; |
| 1935 | } |
| 1936 | hdrsiz += sizeof(struct tcphdr); |
| 1937 | if (mss > hdrsiz) |
| 1938 | mss -= hdrsiz; |
| 1939 | |
| 1940 | mss = max(tcp_mssdflt, mss); |
| 1941 | return (mss); |
| 1942 | } |
| 1943 | |
| 1944 | /* |
| 1945 | * Set connection variables based on the peer's advertised MSS. |
| 1946 | * We are passed the TCPCB for the actual connection. If we |
| 1947 | * are the server, we are called by the compressed state engine |
| 1948 | * when the 3-way handshake is complete. If we are the client, |
| 1949 | * we are called when we receive the SYN,ACK from the server. |
| 1950 | * |
| 1951 | * NOTE: Our advertised MSS value must be initialized in the TCPCB |
| 1952 | * before this routine is called! |
| 1953 | */ |
| 1954 | void |
| 1955 | tcp_mss_from_peer(struct tcpcb *tp, int offer) |
| 1956 | { |
| 1957 | struct socket *so; |
| 1958 | #if defined(RTV_SPIPE) || defined(RTV_SSTHRESH) |
| 1959 | struct rtentry *rt; |
| 1960 | #endif |
| 1961 | u_long bufsize; |
| 1962 | int mss; |
| 1963 | |
| 1964 | #ifdef DIAGNOSTIC |
| 1965 | if (tp->t_inpcb && tp->t_in6pcb) |
| 1966 | panic("tcp_mss_from_peer: both t_inpcb and t_in6pcb are set" ); |
| 1967 | #endif |
| 1968 | so = NULL; |
| 1969 | rt = NULL; |
| 1970 | #ifdef INET |
| 1971 | if (tp->t_inpcb) { |
| 1972 | so = tp->t_inpcb->inp_socket; |
| 1973 | #if defined(RTV_SPIPE) || defined(RTV_SSTHRESH) |
| 1974 | rt = in_pcbrtentry(tp->t_inpcb); |
| 1975 | #endif |
| 1976 | } |
| 1977 | #endif |
| 1978 | #ifdef INET6 |
| 1979 | if (tp->t_in6pcb) { |
| 1980 | so = tp->t_in6pcb->in6p_socket; |
| 1981 | #if defined(RTV_SPIPE) || defined(RTV_SSTHRESH) |
| 1982 | rt = in6_pcbrtentry(tp->t_in6pcb); |
| 1983 | #endif |
| 1984 | } |
| 1985 | #endif |
| 1986 | |
| 1987 | /* |
| 1988 | * As per RFC1122, use the default MSS value, unless they |
| 1989 | * sent us an offer. Do not accept offers less than 256 bytes. |
| 1990 | */ |
| 1991 | mss = tcp_mssdflt; |
| 1992 | if (offer) |
| 1993 | mss = offer; |
| 1994 | mss = max(mss, 256); /* sanity */ |
| 1995 | tp->t_peermss = mss; |
| 1996 | mss -= tcp_optlen(tp); |
| 1997 | #ifdef INET |
| 1998 | if (tp->t_inpcb) |
| 1999 | mss -= ip_optlen(tp->t_inpcb); |
| 2000 | #endif |
| 2001 | #ifdef INET6 |
| 2002 | if (tp->t_in6pcb) |
| 2003 | mss -= ip6_optlen(tp->t_in6pcb); |
| 2004 | #endif |
| 2005 | |
| 2006 | /* |
| 2007 | * If there's a pipesize, change the socket buffer to that size. |
| 2008 | * Make the socket buffer an integral number of MSS units. If |
| 2009 | * the MSS is larger than the socket buffer, artificially decrease |
| 2010 | * the MSS. |
| 2011 | */ |
| 2012 | #ifdef RTV_SPIPE |
| 2013 | if (rt != NULL && rt->rt_rmx.rmx_sendpipe != 0) |
| 2014 | bufsize = rt->rt_rmx.rmx_sendpipe; |
| 2015 | else |
| 2016 | #endif |
| 2017 | { |
| 2018 | KASSERT(so != NULL); |
| 2019 | bufsize = so->so_snd.sb_hiwat; |
| 2020 | } |
| 2021 | if (bufsize < mss) |
| 2022 | mss = bufsize; |
| 2023 | else { |
| 2024 | bufsize = roundup(bufsize, mss); |
| 2025 | if (bufsize > sb_max) |
| 2026 | bufsize = sb_max; |
| 2027 | (void) sbreserve(&so->so_snd, bufsize, so); |
| 2028 | } |
| 2029 | tp->t_segsz = mss; |
| 2030 | |
| 2031 | #ifdef RTV_SSTHRESH |
| 2032 | if (rt != NULL && rt->rt_rmx.rmx_ssthresh) { |
| 2033 | /* |
| 2034 | * There's some sort of gateway or interface buffer |
| 2035 | * limit on the path. Use this to set the slow |
| 2036 | * start threshold, but set the threshold to no less |
| 2037 | * than 2 * MSS. |
| 2038 | */ |
| 2039 | tp->snd_ssthresh = max(2 * mss, rt->rt_rmx.rmx_ssthresh); |
| 2040 | } |
| 2041 | #endif |
| 2042 | } |
| 2043 | |
| 2044 | /* |
| 2045 | * Processing necessary when a TCP connection is established. |
| 2046 | */ |
| 2047 | void |
| 2048 | tcp_established(struct tcpcb *tp) |
| 2049 | { |
| 2050 | struct socket *so; |
| 2051 | #ifdef RTV_RPIPE |
| 2052 | struct rtentry *rt; |
| 2053 | #endif |
| 2054 | u_long bufsize; |
| 2055 | |
| 2056 | #ifdef DIAGNOSTIC |
| 2057 | if (tp->t_inpcb && tp->t_in6pcb) |
| 2058 | panic("tcp_established: both t_inpcb and t_in6pcb are set" ); |
| 2059 | #endif |
| 2060 | so = NULL; |
| 2061 | rt = NULL; |
| 2062 | #ifdef INET |
| 2063 | /* This is a while() to reduce the dreadful stairstepping below */ |
| 2064 | while (tp->t_inpcb) { |
| 2065 | so = tp->t_inpcb->inp_socket; |
| 2066 | #if defined(RTV_RPIPE) |
| 2067 | rt = in_pcbrtentry(tp->t_inpcb); |
| 2068 | #endif |
| 2069 | if (__predict_true(tcp_msl_enable)) { |
| 2070 | if (tp->t_inpcb->inp_laddr.s_addr == INADDR_LOOPBACK) { |
| 2071 | tp->t_msl = tcp_msl_loop ? tcp_msl_loop : (TCPTV_MSL >> 2); |
| 2072 | break; |
| 2073 | } |
| 2074 | |
| 2075 | if (__predict_false(tcp_rttlocal)) { |
| 2076 | /* This may be adjusted by tcp_input */ |
| 2077 | tp->t_msl = tcp_msl_local ? tcp_msl_local : (TCPTV_MSL >> 1); |
| 2078 | break; |
| 2079 | } |
| 2080 | if (in_localaddr(tp->t_inpcb->inp_faddr)) { |
| 2081 | tp->t_msl = tcp_msl_local ? tcp_msl_local : (TCPTV_MSL >> 1); |
| 2082 | break; |
| 2083 | } |
| 2084 | } |
| 2085 | tp->t_msl = tcp_msl_remote ? tcp_msl_remote : TCPTV_MSL; |
| 2086 | break; |
| 2087 | } |
| 2088 | #endif |
| 2089 | #ifdef INET6 |
| 2090 | /* The !tp->t_inpcb lets the compiler know it can't be v4 *and* v6 */ |
| 2091 | while (!tp->t_inpcb && tp->t_in6pcb) { |
| 2092 | so = tp->t_in6pcb->in6p_socket; |
| 2093 | #if defined(RTV_RPIPE) |
| 2094 | rt = in6_pcbrtentry(tp->t_in6pcb); |
| 2095 | #endif |
| 2096 | if (__predict_true(tcp_msl_enable)) { |
| 2097 | extern const struct in6_addr in6addr_loopback; |
| 2098 | |
| 2099 | if (IN6_ARE_ADDR_EQUAL(&tp->t_in6pcb->in6p_laddr, |
| 2100 | &in6addr_loopback)) { |
| 2101 | tp->t_msl = tcp_msl_loop ? tcp_msl_loop : (TCPTV_MSL >> 2); |
| 2102 | break; |
| 2103 | } |
| 2104 | |
| 2105 | if (__predict_false(tcp_rttlocal)) { |
| 2106 | /* This may be adjusted by tcp_input */ |
| 2107 | tp->t_msl = tcp_msl_local ? tcp_msl_local : (TCPTV_MSL >> 1); |
| 2108 | break; |
| 2109 | } |
| 2110 | if (in6_localaddr(&tp->t_in6pcb->in6p_faddr)) { |
| 2111 | tp->t_msl = tcp_msl_local ? tcp_msl_local : (TCPTV_MSL >> 1); |
| 2112 | break; |
| 2113 | } |
| 2114 | } |
| 2115 | tp->t_msl = tcp_msl_remote ? tcp_msl_remote : TCPTV_MSL; |
| 2116 | break; |
| 2117 | } |
| 2118 | #endif |
| 2119 | |
| 2120 | tp->t_state = TCPS_ESTABLISHED; |
| 2121 | TCP_TIMER_ARM(tp, TCPT_KEEP, tp->t_keepidle); |
| 2122 | |
| 2123 | #ifdef RTV_RPIPE |
| 2124 | if (rt != NULL && rt->rt_rmx.rmx_recvpipe != 0) |
| 2125 | bufsize = rt->rt_rmx.rmx_recvpipe; |
| 2126 | else |
| 2127 | #endif |
| 2128 | { |
| 2129 | KASSERT(so != NULL); |
| 2130 | bufsize = so->so_rcv.sb_hiwat; |
| 2131 | } |
| 2132 | if (bufsize > tp->t_ourmss) { |
| 2133 | bufsize = roundup(bufsize, tp->t_ourmss); |
| 2134 | if (bufsize > sb_max) |
| 2135 | bufsize = sb_max; |
| 2136 | (void) sbreserve(&so->so_rcv, bufsize, so); |
| 2137 | } |
| 2138 | } |
| 2139 | |
| 2140 | /* |
| 2141 | * Check if there's an initial rtt or rttvar. Convert from the |
| 2142 | * route-table units to scaled multiples of the slow timeout timer. |
| 2143 | * Called only during the 3-way handshake. |
| 2144 | */ |
| 2145 | void |
| 2146 | tcp_rmx_rtt(struct tcpcb *tp) |
| 2147 | { |
| 2148 | #ifdef RTV_RTT |
| 2149 | struct rtentry *rt = NULL; |
| 2150 | int rtt; |
| 2151 | |
| 2152 | #ifdef DIAGNOSTIC |
| 2153 | if (tp->t_inpcb && tp->t_in6pcb) |
| 2154 | panic("tcp_rmx_rtt: both t_inpcb and t_in6pcb are set" ); |
| 2155 | #endif |
| 2156 | #ifdef INET |
| 2157 | if (tp->t_inpcb) |
| 2158 | rt = in_pcbrtentry(tp->t_inpcb); |
| 2159 | #endif |
| 2160 | #ifdef INET6 |
| 2161 | if (tp->t_in6pcb) |
| 2162 | rt = in6_pcbrtentry(tp->t_in6pcb); |
| 2163 | #endif |
| 2164 | if (rt == NULL) |
| 2165 | return; |
| 2166 | |
| 2167 | if (tp->t_srtt == 0 && (rtt = rt->rt_rmx.rmx_rtt)) { |
| 2168 | /* |
| 2169 | * XXX The lock bit for MTU indicates that the value |
| 2170 | * is also a minimum value; this is subject to time. |
| 2171 | */ |
| 2172 | if (rt->rt_rmx.rmx_locks & RTV_RTT) |
| 2173 | TCPT_RANGESET(tp->t_rttmin, |
| 2174 | rtt / (RTM_RTTUNIT / PR_SLOWHZ), |
| 2175 | TCPTV_MIN, TCPTV_REXMTMAX); |
| 2176 | tp->t_srtt = rtt / |
| 2177 | ((RTM_RTTUNIT / PR_SLOWHZ) >> (TCP_RTT_SHIFT + 2)); |
| 2178 | if (rt->rt_rmx.rmx_rttvar) { |
| 2179 | tp->t_rttvar = rt->rt_rmx.rmx_rttvar / |
| 2180 | ((RTM_RTTUNIT / PR_SLOWHZ) >> |
| 2181 | (TCP_RTTVAR_SHIFT + 2)); |
| 2182 | } else { |
| 2183 | /* Default variation is +- 1 rtt */ |
| 2184 | tp->t_rttvar = |
| 2185 | tp->t_srtt >> (TCP_RTT_SHIFT - TCP_RTTVAR_SHIFT); |
| 2186 | } |
| 2187 | TCPT_RANGESET(tp->t_rxtcur, |
| 2188 | ((tp->t_srtt >> 2) + tp->t_rttvar) >> (1 + 2), |
| 2189 | tp->t_rttmin, TCPTV_REXMTMAX); |
| 2190 | } |
| 2191 | #endif |
| 2192 | } |
| 2193 | |
| 2194 | tcp_seq tcp_iss_seq = 0; /* tcp initial seq # */ |
| 2195 | |
| 2196 | /* |
| 2197 | * Get a new sequence value given a tcp control block |
| 2198 | */ |
| 2199 | tcp_seq |
| 2200 | tcp_new_iss(struct tcpcb *tp, tcp_seq addin) |
| 2201 | { |
| 2202 | |
| 2203 | #ifdef INET |
| 2204 | if (tp->t_inpcb != NULL) { |
| 2205 | return (tcp_new_iss1(&tp->t_inpcb->inp_laddr, |
| 2206 | &tp->t_inpcb->inp_faddr, tp->t_inpcb->inp_lport, |
| 2207 | tp->t_inpcb->inp_fport, sizeof(tp->t_inpcb->inp_laddr), |
| 2208 | addin)); |
| 2209 | } |
| 2210 | #endif |
| 2211 | #ifdef INET6 |
| 2212 | if (tp->t_in6pcb != NULL) { |
| 2213 | return (tcp_new_iss1(&tp->t_in6pcb->in6p_laddr, |
| 2214 | &tp->t_in6pcb->in6p_faddr, tp->t_in6pcb->in6p_lport, |
| 2215 | tp->t_in6pcb->in6p_fport, sizeof(tp->t_in6pcb->in6p_laddr), |
| 2216 | addin)); |
| 2217 | } |
| 2218 | #endif |
| 2219 | /* Not possible. */ |
| 2220 | panic("tcp_new_iss" ); |
| 2221 | } |
| 2222 | |
| 2223 | static u_int8_t tcp_iss_secret[16]; /* 128 bits; should be plenty */ |
| 2224 | |
| 2225 | /* |
| 2226 | * Initialize RFC 1948 ISS Secret |
| 2227 | */ |
| 2228 | static int |
| 2229 | tcp_iss_secret_init(void) |
| 2230 | { |
| 2231 | cprng_strong(kern_cprng, |
| 2232 | tcp_iss_secret, sizeof(tcp_iss_secret), 0); |
| 2233 | |
| 2234 | return 0; |
| 2235 | } |
| 2236 | |
| 2237 | /* |
| 2238 | * This routine actually generates a new TCP initial sequence number. |
| 2239 | */ |
| 2240 | tcp_seq |
| 2241 | tcp_new_iss1(void *laddr, void *faddr, u_int16_t lport, u_int16_t fport, |
| 2242 | size_t addrsz, tcp_seq addin) |
| 2243 | { |
| 2244 | tcp_seq tcp_iss; |
| 2245 | |
| 2246 | if (tcp_do_rfc1948) { |
| 2247 | MD5_CTX ctx; |
| 2248 | u_int8_t hash[16]; /* XXX MD5 knowledge */ |
| 2249 | static ONCE_DECL(tcp_iss_secret_control); |
| 2250 | |
| 2251 | /* |
| 2252 | * If we haven't been here before, initialize our cryptographic |
| 2253 | * hash secret. |
| 2254 | */ |
| 2255 | RUN_ONCE(&tcp_iss_secret_control, tcp_iss_secret_init); |
| 2256 | |
| 2257 | /* |
| 2258 | * Compute the base value of the ISS. It is a hash |
| 2259 | * of (saddr, sport, daddr, dport, secret). |
| 2260 | */ |
| 2261 | MD5Init(&ctx); |
| 2262 | |
| 2263 | MD5Update(&ctx, (u_char *) laddr, addrsz); |
| 2264 | MD5Update(&ctx, (u_char *) &lport, sizeof(lport)); |
| 2265 | |
| 2266 | MD5Update(&ctx, (u_char *) faddr, addrsz); |
| 2267 | MD5Update(&ctx, (u_char *) &fport, sizeof(fport)); |
| 2268 | |
| 2269 | MD5Update(&ctx, tcp_iss_secret, sizeof(tcp_iss_secret)); |
| 2270 | |
| 2271 | MD5Final(hash, &ctx); |
| 2272 | |
| 2273 | memcpy(&tcp_iss, hash, sizeof(tcp_iss)); |
| 2274 | |
| 2275 | /* |
| 2276 | * Now increment our "timer", and add it in to |
| 2277 | * the computed value. |
| 2278 | * |
| 2279 | * XXX Use `addin'? |
| 2280 | * XXX TCP_ISSINCR too large to use? |
| 2281 | */ |
| 2282 | tcp_iss_seq += TCP_ISSINCR; |
| 2283 | #ifdef TCPISS_DEBUG |
| 2284 | printf("ISS hash 0x%08x, " , tcp_iss); |
| 2285 | #endif |
| 2286 | tcp_iss += tcp_iss_seq + addin; |
| 2287 | #ifdef TCPISS_DEBUG |
| 2288 | printf("new ISS 0x%08x\n" , tcp_iss); |
| 2289 | #endif |
| 2290 | } else { |
| 2291 | /* |
| 2292 | * Randomize. |
| 2293 | */ |
| 2294 | tcp_iss = cprng_fast32(); |
| 2295 | |
| 2296 | /* |
| 2297 | * If we were asked to add some amount to a known value, |
| 2298 | * we will take a random value obtained above, mask off |
| 2299 | * the upper bits, and add in the known value. We also |
| 2300 | * add in a constant to ensure that we are at least a |
| 2301 | * certain distance from the original value. |
| 2302 | * |
| 2303 | * This is used when an old connection is in timed wait |
| 2304 | * and we have a new one coming in, for instance. |
| 2305 | */ |
| 2306 | if (addin != 0) { |
| 2307 | #ifdef TCPISS_DEBUG |
| 2308 | printf("Random %08x, " , tcp_iss); |
| 2309 | #endif |
| 2310 | tcp_iss &= TCP_ISS_RANDOM_MASK; |
| 2311 | tcp_iss += addin + TCP_ISSINCR; |
| 2312 | #ifdef TCPISS_DEBUG |
| 2313 | printf("Old ISS %08x, ISS %08x\n" , addin, tcp_iss); |
| 2314 | #endif |
| 2315 | } else { |
| 2316 | tcp_iss &= TCP_ISS_RANDOM_MASK; |
| 2317 | tcp_iss += tcp_iss_seq; |
| 2318 | tcp_iss_seq += TCP_ISSINCR; |
| 2319 | #ifdef TCPISS_DEBUG |
| 2320 | printf("ISS %08x\n" , tcp_iss); |
| 2321 | #endif |
| 2322 | } |
| 2323 | } |
| 2324 | |
| 2325 | if (tcp_compat_42) { |
| 2326 | /* |
| 2327 | * Limit it to the positive range for really old TCP |
| 2328 | * implementations. |
| 2329 | * Just AND off the top bit instead of checking if |
| 2330 | * is set first - saves a branch 50% of the time. |
| 2331 | */ |
| 2332 | tcp_iss &= 0x7fffffff; /* XXX */ |
| 2333 | } |
| 2334 | |
| 2335 | return (tcp_iss); |
| 2336 | } |
| 2337 | |
| 2338 | #if defined(IPSEC) |
| 2339 | /* compute ESP/AH header size for TCP, including outer IP header. */ |
| 2340 | size_t |
| 2341 | ipsec4_hdrsiz_tcp(struct tcpcb *tp) |
| 2342 | { |
| 2343 | struct inpcb *inp; |
| 2344 | size_t hdrsiz; |
| 2345 | |
| 2346 | /* XXX mapped addr case (tp->t_in6pcb) */ |
| 2347 | if (!tp || !tp->t_template || !(inp = tp->t_inpcb)) |
| 2348 | return 0; |
| 2349 | switch (tp->t_family) { |
| 2350 | case AF_INET: |
| 2351 | /* XXX: should use currect direction. */ |
| 2352 | hdrsiz = ipsec4_hdrsiz(tp->t_template, IPSEC_DIR_OUTBOUND, inp); |
| 2353 | break; |
| 2354 | default: |
| 2355 | hdrsiz = 0; |
| 2356 | break; |
| 2357 | } |
| 2358 | |
| 2359 | return hdrsiz; |
| 2360 | } |
| 2361 | |
| 2362 | #ifdef INET6 |
| 2363 | size_t |
| 2364 | ipsec6_hdrsiz_tcp(struct tcpcb *tp) |
| 2365 | { |
| 2366 | struct in6pcb *in6p; |
| 2367 | size_t hdrsiz; |
| 2368 | |
| 2369 | if (!tp || !tp->t_template || !(in6p = tp->t_in6pcb)) |
| 2370 | return 0; |
| 2371 | switch (tp->t_family) { |
| 2372 | case AF_INET6: |
| 2373 | /* XXX: should use currect direction. */ |
| 2374 | hdrsiz = ipsec6_hdrsiz(tp->t_template, IPSEC_DIR_OUTBOUND, in6p); |
| 2375 | break; |
| 2376 | case AF_INET: |
| 2377 | /* mapped address case - tricky */ |
| 2378 | default: |
| 2379 | hdrsiz = 0; |
| 2380 | break; |
| 2381 | } |
| 2382 | |
| 2383 | return hdrsiz; |
| 2384 | } |
| 2385 | #endif |
| 2386 | #endif /*IPSEC*/ |
| 2387 | |
| 2388 | /* |
| 2389 | * Determine the length of the TCP options for this connection. |
| 2390 | * |
| 2391 | * XXX: What do we do for SACK, when we add that? Just reserve |
| 2392 | * all of the space? Otherwise we can't exactly be incrementing |
| 2393 | * cwnd by an amount that varies depending on the amount we last |
| 2394 | * had to SACK! |
| 2395 | */ |
| 2396 | |
| 2397 | u_int |
| 2398 | tcp_optlen(struct tcpcb *tp) |
| 2399 | { |
| 2400 | u_int optlen; |
| 2401 | |
| 2402 | optlen = 0; |
| 2403 | if ((tp->t_flags & (TF_REQ_TSTMP|TF_RCVD_TSTMP|TF_NOOPT)) == |
| 2404 | (TF_REQ_TSTMP | TF_RCVD_TSTMP)) |
| 2405 | optlen += TCPOLEN_TSTAMP_APPA; |
| 2406 | |
| 2407 | #ifdef TCP_SIGNATURE |
| 2408 | if (tp->t_flags & TF_SIGNATURE) |
| 2409 | optlen += TCPOLEN_SIGNATURE + 2; |
| 2410 | #endif /* TCP_SIGNATURE */ |
| 2411 | |
| 2412 | return optlen; |
| 2413 | } |
| 2414 | |
| 2415 | u_int |
| 2416 | tcp_hdrsz(struct tcpcb *tp) |
| 2417 | { |
| 2418 | u_int hlen; |
| 2419 | |
| 2420 | switch (tp->t_family) { |
| 2421 | #ifdef INET6 |
| 2422 | case AF_INET6: |
| 2423 | hlen = sizeof(struct ip6_hdr); |
| 2424 | break; |
| 2425 | #endif |
| 2426 | case AF_INET: |
| 2427 | hlen = sizeof(struct ip); |
| 2428 | break; |
| 2429 | default: |
| 2430 | hlen = 0; |
| 2431 | break; |
| 2432 | } |
| 2433 | hlen += sizeof(struct tcphdr); |
| 2434 | |
| 2435 | if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP && |
| 2436 | (tp->t_flags & TF_RCVD_TSTMP) == TF_RCVD_TSTMP) |
| 2437 | hlen += TCPOLEN_TSTAMP_APPA; |
| 2438 | #ifdef TCP_SIGNATURE |
| 2439 | if (tp->t_flags & TF_SIGNATURE) |
| 2440 | hlen += TCPOLEN_SIGLEN; |
| 2441 | #endif |
| 2442 | return hlen; |
| 2443 | } |
| 2444 | |
| 2445 | void |
| 2446 | tcp_statinc(u_int stat) |
| 2447 | { |
| 2448 | |
| 2449 | KASSERT(stat < TCP_NSTATS); |
| 2450 | TCP_STATINC(stat); |
| 2451 | } |
| 2452 | |
| 2453 | void |
| 2454 | tcp_statadd(u_int stat, uint64_t val) |
| 2455 | { |
| 2456 | |
| 2457 | KASSERT(stat < TCP_NSTATS); |
| 2458 | TCP_STATADD(stat, val); |
| 2459 | } |
| 2460 | |