dccp_usrreq.c revision 1.18
1 /* $KAME: dccp_usrreq.c,v 1.67 2005/11/03 16:05:04 nishida Exp $ */ 2 /* $NetBSD: dccp_usrreq.c,v 1.18 2018/05/03 07:01:08 maxv Exp $ */ 3 4 /* 5 * Copyright (c) 2003 Joacim Hggmark, Magnus Erixzon, Nils-Erik Mattsson 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. The name of the author may not be used to endorse or promote products 18 * derived from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 21 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 22 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 23 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 24 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 26 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 27 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 28 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 29 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 * 31 * Id: dccp_usrreq.c,v 1.47 2003/07/31 11:23:08 joahag-9 Exp 32 */ 33 34 /* 35 * Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995 36 * The Regents of the University of California. All rights reserved. 37 * 38 * Redistribution and use in source and binary forms, with or without 39 * modification, are permitted provided that the following conditions 40 * are met: 41 * 1. Redistributions of source code must retain the above copyright 42 * notice, this list of conditions and the following disclaimer. 43 * 2. Redistributions in binary form must reproduce the above copyright 44 * notice, this list of conditions and the following disclaimer in the 45 * documentation and/or other materials provided with the distribution. 46 * 3. All advertising materials mentioning features or use of this software 47 * must display the following acknowledgement: 48 * This product includes software developed by the University of 49 * California, Berkeley and its contributors. 50 * 4. Neither the name of the University nor the names of its contributors 51 * may be used to endorse or promote products derived from this software 52 * without specific prior written permission. 53 * 54 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 55 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 56 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 57 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 58 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 59 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 60 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 61 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 62 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 63 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 64 * SUCH DAMAGE. 65 * 66 * @(#)udp_usrreq.c 8.6 (Berkeley) 5/23/95 67 */ 68 69 #include <sys/cdefs.h> 70 __KERNEL_RCSID(0, "$NetBSD: dccp_usrreq.c,v 1.18 2018/05/03 07:01:08 maxv Exp $"); 71 72 #ifdef _KERNEL_OPT 73 #include "opt_inet.h" 74 #include "opt_dccp.h" 75 #endif 76 77 #include <sys/param.h> 78 #include <sys/systm.h> 79 #include <sys/domain.h> 80 #include <sys/kernel.h> 81 #include <sys/pool.h> 82 #include <sys/lock.h> 83 #include <sys/malloc.h> 84 #include <sys/mbuf.h> 85 #include <sys/proc.h> 86 #include <sys/protosw.h> 87 #include <sys/signalvar.h> 88 #include <sys/socket.h> 89 #include <sys/socketvar.h> 90 #include <sys/mutex.h> 91 #include <sys/sysctl.h> 92 #include <sys/syslog.h> 93 #include <sys/queue.h> 94 95 #include <net/if.h> 96 97 #include <netinet/in.h> 98 #include <netinet/in_systm.h> 99 #include <netinet/ip.h> 100 #include <netinet/in_pcb.h> 101 #include <netinet/in_var.h> 102 #ifdef INET6 103 #include <netinet/ip6.h> 104 #endif 105 #include <netinet/ip_icmp.h> 106 #include <netinet/icmp_var.h> 107 #include <netinet/ip_var.h> 108 #ifdef INET6 109 #include <netinet6/in6_pcb.h> 110 #include <netinet6/ip6_var.h> 111 #include <netinet6/dccp6_var.h> 112 #endif 113 #include <netinet/dccp.h> 114 #include <netinet/dccp_var.h> 115 #include <netinet/dccp_cc_sw.h> 116 117 #define DEFAULT_CCID 2 118 119 #define INP_INFO_LOCK_INIT(x,y) 120 #define INP_INFO_WLOCK(x) 121 #define INP_INFO_WUNLOCK(x) 122 #define INP_INFO_RLOCK(x) 123 #define INP_INFO_RUNLOCK(x) 124 #define INP_LOCK(x) 125 #define IN6P_LOCK(x) 126 #define INP_UNLOCK(x) 127 #define IN6P_UNLOCK(x) 128 129 /* Congestion control switch table */ 130 extern struct dccp_cc_sw cc_sw[]; 131 132 int dccp_log_in_vain = 1; 133 int dccp_do_feature_nego = 1; 134 135 struct inpcbhead dccpb; /* from dccp_var.h */ 136 #ifdef __FreeBSD__ 137 struct inpcbinfo dccpbinfo; 138 #else 139 struct inpcbtable dccpbtable; 140 #endif 141 142 #ifndef DCCPBHASHSIZE 143 #define DCCPBHASHSIZE 16 144 #endif 145 146 struct pool dccpcb_pool; 147 148 u_long dccp_sendspace = 32768; 149 u_long dccp_recvspace = 65536; 150 151 struct dccpstat dccpstat; /* from dccp_var.h */ 152 153 static struct dccpcb * dccp_close(struct dccpcb *); 154 static int dccp_disconnect2(struct dccpcb *); 155 int dccp_get_option(char *, int, int, char *,int); 156 void dccp_parse_options(struct dccpcb *, char *, int); 157 int dccp_remove_feature(struct dccpcb *, u_int8_t, u_int8_t); 158 int dccp_add_feature_option(struct dccpcb *, u_int8_t, u_int8_t, char *, u_int8_t); 159 void dccp_feature_neg(struct dccpcb *, u_int8_t, u_int8_t, u_int8_t, char *); 160 void dccp_close_t(void *); 161 void dccp_timewait_t(void *); 162 163 /* Ack Vector functions */ 164 #define DCCP_VECTORSIZE 512 /* initial ack and cwnd-vector size. Multiple of 8 ! */ 165 void dccp_use_ackvector(struct dccpcb *); 166 void dccp_update_ackvector(struct dccpcb *, u_int64_t); 167 void dccp_increment_ackvector(struct dccpcb *, u_int64_t); 168 u_int16_t dccp_generate_ackvector(struct dccpcb *, u_char *); 169 u_char dccp_ackvector_state(struct dccpcb *, u_int64_t); 170 171 /* 172 * DCCP initialization 173 */ 174 void 175 dccp_init(void) 176 { 177 pool_init(&dccpcb_pool, sizeof(struct dccpcb), 0, 0, 0, "dccpcbpl", 178 NULL, IPL_SOFTNET); 179 180 in_pcbinit(&dccpbtable, DCCPBHASHSIZE, DCCPBHASHSIZE); 181 } 182 183 void 184 dccp_input(struct mbuf *m, ...) 185 { 186 int iphlen; 187 struct ip *ip = NULL; 188 struct dccphdr *dh; 189 struct dccplhdr *dlh; 190 struct inpcb *inp = NULL, *oinp = NULL; 191 struct in6pcb *in6p = NULL, *oin6p = NULL; 192 struct dccpcb *dp; 193 struct ipovly *ipov = NULL; 194 struct dccp_requesthdr *drqh; 195 struct dccp_ackhdr *dah = NULL; 196 struct dccp_acklhdr *dalh = NULL; 197 struct dccp_resethdr *drth; 198 struct socket *so; 199 u_char *optp = NULL; 200 struct mbuf *opts = 0; 201 int len, data_off, extrah_len, optlen; 202 /*struct ip save_ip;*/ 203 char options[DCCP_MAX_OPTIONS]; 204 char test[2]; 205 u_int32_t cslen; 206 dccp_seq seqnr, low_seqnr, high_seqnr; 207 int isipv6 = 0; 208 int is_shortseq; /* Is this shortseq packet? */ 209 #ifdef INET6 210 struct ip6_hdr *ip6 = NULL; 211 #endif 212 213 int off; 214 va_list ap; 215 216 va_start(ap, m); 217 iphlen = off = va_arg(ap, int); 218 va_end(ap); 219 220 DCCP_DEBUG((LOG_INFO, "Got DCCP packet!\n")); 221 222 dccpstat.dccps_ipackets++; 223 dccpstat.dccps_ibytes += m->m_pkthdr.len; 224 225 #ifdef INET6 226 isipv6 = (mtod(m, struct ip *)->ip_v == 6) ? 1 : 0; 227 #endif 228 229 #ifdef INET6 230 if (isipv6) { 231 DCCP_DEBUG((LOG_INFO, "Got DCCP ipv6 packet, iphlen = %u!\n", iphlen)); 232 ip6 = mtod(m, struct ip6_hdr *); 233 IP6_EXTHDR_GET(dh, struct dccphdr *, m, iphlen, sizeof(*dh)); 234 if (dh == NULL) { 235 dccpstat.dccps_badlen++; 236 return; 237 } 238 } else 239 #endif 240 { 241 /* 242 * Strip IP options, if any; should skip this, 243 * make available to user, and use on returned packets, 244 * but we don't yet have a way to check the checksum 245 * with options still present. 246 */ 247 if (iphlen > sizeof (struct ip)) { 248 DCCP_DEBUG((LOG_INFO, "Need to strip options\n")); 249 #if 0 /* XXX */ 250 ip_stripoptions(m, (struct mbuf *)0); 251 #endif 252 iphlen = sizeof(struct ip); 253 } 254 255 /* 256 * Get IP and DCCP header together in first mbuf. 257 */ 258 ip = mtod(m, struct ip *); 259 IP6_EXTHDR_GET(dh, struct dccphdr *, m, iphlen, sizeof(*dh)); 260 if (dh == NULL) { 261 dccpstat.dccps_badlen++; 262 return; 263 } 264 } 265 dlh = (struct dccplhdr*)dh; 266 is_shortseq = !dh->dh_x; 267 268 if (!is_shortseq) { 269 DCCP_DEBUG((LOG_INFO, 270 "Header info: cslen = %u, off = %u, type = %u, reserved = %u, seq = %u.%lu\n", 271 dlh->dh_cscov, dlh->dh_off, dlh->dh_type, dlh->dh_res, ntohs(dlh->dh_seq), 272 (unsigned long)ntohl(dlh->dh_seq2))); 273 } else { 274 DCCP_DEBUG((LOG_INFO, 275 "Header info(short): cslen = %u, off = %u, type = %u, reserved = %u, seq = %u\n", 276 dh->dh_cscov, dh->dh_off, dh->dh_type, dh->dh_res, ntohl(dh->dh_seq))); 277 } 278 279 /* 280 * Make mbuf data length reflect DCCP length. 281 * If not enough data to reflect DCCP length, drop. 282 */ 283 284 #ifdef INET6 285 if (isipv6) 286 len = m->m_pkthdr.len - off; 287 else 288 #endif 289 { 290 len = ntohs(ip->ip_len); 291 len -= ip->ip_hl << 2; 292 } 293 294 if (len < sizeof(struct dccphdr)) { 295 DCCP_DEBUG((LOG_INFO, "Dropping DCCP packet!\n")); 296 dccpstat.dccps_badlen++; 297 goto badunlocked; 298 } 299 /* 300 * Save a copy of the IP header in case we want restore it 301 * for sending a DCCP reset packet in response. 302 */ 303 if (!isipv6) { 304 /*save_ip = *ip;*/ 305 ipov = (struct ipovly *)ip; 306 } 307 308 if (dh->dh_cscov == 0) { 309 cslen = len; 310 } else { 311 cslen = dh->dh_off * 4 + (dh->dh_cscov - 1) * 4; 312 if (cslen > len) 313 cslen = len; 314 } 315 316 /* 317 * Checksum extended DCCP header and data. 318 */ 319 320 #ifdef INET6 321 if (isipv6) { 322 if (in6_cksum(m, IPPROTO_DCCP, off, cslen) != 0) { 323 dccpstat.dccps_badsum++; 324 goto badunlocked; 325 } 326 } else 327 #endif 328 { 329 memset(ipov->ih_x1, 0, sizeof(ipov->ih_x1)); 330 ip->ip_len = htons(m->m_pkthdr.len); 331 dh->dh_sum = in4_cksum(m, IPPROTO_DCCP, off, cslen); 332 333 if (dh->dh_sum) { 334 dccpstat.dccps_badsum++; 335 goto badunlocked; 336 } 337 } 338 339 INP_INFO_WLOCK(&dccpbinfo); 340 341 /* 342 * Locate pcb for datagram. 343 */ 344 #ifdef INET6 345 if (isipv6) { 346 in6p = in6_pcblookup_connect(&dccpbtable, &ip6->ip6_src, 347 dh->dh_sport, &ip6->ip6_dst, dh->dh_dport, 0, 0); 348 if (in6p == 0) { 349 /* XXX stats increment? */ 350 in6p = in6_pcblookup_bind(&dccpbtable, &ip6->ip6_dst, 351 dh->dh_dport, 0); 352 } 353 } else 354 #endif 355 { 356 inp = in_pcblookup_connect(&dccpbtable, ip->ip_src, 357 dh->dh_sport, ip->ip_dst, dh->dh_dport, 0); 358 if (inp == NULL) { 359 /* XXX stats increment? */ 360 inp = in_pcblookup_bind(&dccpbtable, ip->ip_dst, 361 dh->dh_dport); 362 } 363 } 364 if (isipv6) { 365 DCCP_DEBUG((LOG_INFO, "in6p=%p\n", in6p)); 366 } else { 367 DCCP_DEBUG((LOG_INFO, "inp=%p\n", inp)); 368 } 369 370 if (isipv6 ? in6p == NULL : inp == NULL) { 371 if (dccp_log_in_vain) { 372 #ifdef INET6 373 char dbuf[INET6_ADDRSTRLEN+2], sbuf[INET6_ADDRSTRLEN+2]; 374 #else 375 char dbuf[4*sizeof "123"], sbuf[4*sizeof "123"]; 376 #endif 377 378 #ifdef INET6 379 if (isipv6) { 380 char ip6buf[INET6_ADDRSTRLEN]; 381 strlcpy(dbuf, "[", sizeof dbuf); 382 strlcat(dbuf, IN6_PRINT(ip6buf, &ip6->ip6_dst), sizeof dbuf); 383 strlcat(dbuf, "]", sizeof dbuf); 384 strlcpy(sbuf, "[", sizeof sbuf); 385 strlcat(sbuf, IN6_PRINT(ip6buf, &ip6->ip6_src), sizeof sbuf); 386 strlcat(sbuf, "]", sizeof sbuf); 387 } else 388 #endif 389 { 390 strlcpy(dbuf, inet_ntoa(ip->ip_dst), sizeof dbuf); 391 strlcpy(sbuf, inet_ntoa(ip->ip_src), sizeof sbuf); 392 } 393 log(LOG_INFO, 394 "Connection attempt to DCCP %s:%d from %s:%d\n", 395 dbuf, ntohs(dh->dh_dport), sbuf, 396 ntohs(dh->dh_sport)); 397 } 398 dccpstat.dccps_noport++; 399 400 /* 401 * We should send DCCP reset here but we can't call dccp_output 402 * since we have no dccpcb. A icmp unreachable works great but 403 * the specs says DCCP reset :( 404 * 405 * if (!isipv6) { 406 * *ip = save_ip; 407 * ip->ip_len += iphlen; 408 * icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0); 409 * } 410 */ 411 412 INP_INFO_WUNLOCK(&dccpbinfo); 413 goto badunlocked; 414 } 415 INP_LOCK(inp); 416 417 #ifdef INET6 418 if (isipv6) 419 dp = in6todccpcb(in6p); 420 else 421 #endif 422 dp = intodccpcb(inp); 423 424 if (dp == 0) { 425 INP_UNLOCK(inp); 426 INP_INFO_WUNLOCK(&dccpbinfo); 427 goto badunlocked; 428 } 429 430 if (dp->state == DCCPS_CLOSED) { 431 DCCP_DEBUG((LOG_INFO, "We are in closed state, dropping packet and sending reset!\n")); 432 if (dh->dh_type != DCCP_TYPE_RESET) 433 dccp_output(dp, DCCP_TYPE_RESET + 2); 434 INP_UNLOCK(inp); 435 INP_INFO_WUNLOCK(&dccpbinfo); 436 goto badunlocked; 437 } 438 439 #if defined(INET6) 440 if (isipv6) 441 so = in6p->in6p_socket; 442 else 443 #endif 444 so = inp->inp_socket; 445 446 if (so->so_options & SO_ACCEPTCONN) { 447 DCCP_DEBUG((LOG_INFO, "so->options & SO_ACCEPTCONN! dp->state = %i\n", dp->state)); 448 so = sonewconn(so, SS_ISCONNECTED); 449 if (so == 0) { 450 DCCP_DEBUG((LOG_INFO, "Error, sonewconn failed!\n")); 451 INP_UNLOCK(inp); 452 INP_INFO_WUNLOCK(&dccpbinfo); 453 goto badunlocked; 454 } 455 456 /* INP_LOCK(inp); XXX */ 457 458 #if defined(INET6) 459 if (isipv6) 460 oin6p = in6p; 461 else 462 #endif 463 oinp = inp; 464 465 #ifdef INET6 466 if (isipv6) { 467 in6p = sotoin6pcb(so); 468 in6p->in6p_laddr = ip6->ip6_dst; 469 in6p->in6p_faddr = ip6->ip6_src; 470 in6p->in6p_lport = dh->dh_dport; 471 in6p->in6p_fport = dh->dh_sport; 472 in6_pcbstate(in6p, IN6P_CONNECTED); 473 } else 474 #endif 475 { 476 inp = sotoinpcb(so); 477 inp->inp_laddr = ip->ip_dst; 478 inp->inp_faddr = ip->ip_src; 479 inp->inp_lport = dh->dh_dport; 480 inp->inp_fport = dh->dh_sport; 481 } 482 483 if (!isipv6) 484 in_pcbstate(inp, INP_BOUND); 485 486 #if defined(INET6) 487 if (isipv6) 488 dp = (struct dccpcb *)in6p->in6p_ppcb; 489 else 490 #endif 491 dp = (struct dccpcb *)inp->inp_ppcb; 492 493 dp->state = DCCPS_LISTEN; 494 dp->who = DCCP_SERVER; 495 #if defined(INET6) 496 if (isipv6) { 497 dp->cslen = ((struct dccpcb *)oin6p->in6p_ppcb)->cslen; 498 dp->avgpsize = ((struct dccpcb *)oin6p->in6p_ppcb)->avgpsize; 499 dp->scode = ((struct dccpcb *)oin6p->in6p_ppcb)->scode; 500 } else 501 #endif 502 { 503 dp->cslen = ((struct dccpcb *)oinp->inp_ppcb)->cslen; 504 dp->avgpsize = ((struct dccpcb *)oinp->inp_ppcb)->avgpsize; 505 dp->scode = ((struct dccpcb *)oinp->inp_ppcb)->scode; 506 } 507 dp->seq_snd = (((u_int64_t)random() << 32) | random()) % 281474976710656LL; 508 dp->ref_seq.hi = dp->seq_snd >> 24; 509 dp->ref_seq.lo = (u_int64_t)(dp->seq_snd & 0xffffff); 510 INP_UNLOCK(oinp); 511 DCCP_DEBUG((LOG_INFO, "New dp = %u, dp->state = %u!\n", (int)dp, dp->state)); 512 } 513 514 INP_INFO_WUNLOCK(&dccpbinfo); 515 516 /* 517 * Check if sequence number is inside the loss window 518 */ 519 if (!is_shortseq) { 520 DHDR_TO_DSEQ(seqnr, dlh); 521 } else { 522 /* shortseq */ 523 seqnr = CONVERT_TO_LONGSEQ((ntohl(dh->dh_seq) >> 8), dp->ref_pseq); 524 DCCP_DEBUG((LOG_INFO, "short seq conversion %x, %u %u\n", 525 ntohl(dh->dh_seq) >> 8, dp->ref_pseq.hi, dp->ref_pseq.lo)); 526 } 527 528 DCCP_DEBUG((LOG_INFO, "Received DCCP packet with sequence number = %llu , gsn_rcv %llu\n", seqnr, dp->gsn_rcv)); 529 530 /* store ccval */ 531 dp->ccval = dh->dh_ccval; 532 533 if (dp->gsn_rcv == 281474976710656LL) dp->gsn_rcv = seqnr; 534 if (dp->gsn_rcv > (dp->loss_window / 4)) 535 low_seqnr = (dp->gsn_rcv - (dp->loss_window / 4)) % 281474976710656LL; 536 else 537 low_seqnr = 0ll; 538 high_seqnr = (dp->gsn_rcv + (dp->loss_window / 4 * 3)) % 281474976710656LL; 539 540 if (! (DCCP_SEQ_GT(seqnr, low_seqnr) && DCCP_SEQ_LT(seqnr, high_seqnr))) { 541 dccpstat.dccps_badseq++; 542 DCCP_DEBUG((LOG_INFO, "Received DCCP packet with bad sequence number = %llu (low_seqnr = %llu, high_seqnr = %llu)\n", seqnr, low_seqnr, high_seqnr)); 543 INP_UNLOCK(inp); 544 goto badunlocked; 545 } 546 547 /* dp->gsn_rcv should always be the highest received valid sequence number */ 548 if (DCCP_SEQ_GT(seqnr, dp->gsn_rcv)) 549 dp->gsn_rcv = seqnr; 550 551 /* Just ignore DCCP-Move for now */ 552 if (dlh->dh_type == DCCP_TYPE_DATA) { 553 extrah_len = 0; 554 if (!is_shortseq) 555 optp = (u_char *)(dlh + 1); 556 else 557 optp = (u_char *)(dh + 1); 558 } else if (dh->dh_type == DCCP_TYPE_REQUEST) { 559 drqh = (struct dccp_requesthdr *)(dlh + 1); 560 if (drqh->drqh_scode != dp->scode){ 561 DCCP_DEBUG((LOG_INFO, "service code in request packet doesn't match! %x %x\n", drqh->drqh_scode, dp->scode)); 562 INP_UNLOCK(inp); 563 dp->state = DCCPS_SERVER_CLOSE; /* So disconnect2 doesn't send CLOSEREQ */ 564 dccp_disconnect2(dp); 565 dccp_output(dp, DCCP_TYPE_RESET + 2); 566 dccp_close(dp); 567 goto badunlocked; 568 } 569 optp = (u_char *)(drqh + 1); 570 extrah_len = 4; 571 572 /* store reference peer sequence number */ 573 dp->ref_pseq.hi = seqnr >> 24; 574 dp->ref_pseq.lo = (u_int64_t)(seqnr & 0xffffff); 575 576 } else if (dh->dh_type == DCCP_TYPE_RESET) { 577 extrah_len = 8 ; 578 drth = (struct dccp_resethdr *)(dlh + 1); 579 optp = (u_char *)(drth + 1); 580 } else { 581 if (!is_shortseq){ 582 extrah_len = 8; 583 dalh = (struct dccp_acklhdr *)(dlh + 1); 584 if (dh->dh_type == DCCP_TYPE_RESPONSE) { 585 extrah_len += 4; 586 drqh = (struct dccp_requesthdr *)(dalh + 1); 587 if (drqh->drqh_scode != dp->scode){ 588 DCCP_DEBUG((LOG_INFO, "service code in response packet doesn't match! %x %x\n", drqh->drqh_scode, dp->scode)); 589 INP_UNLOCK(inp); 590 dp->state = DCCPS_CLIENT_CLOSE; /* So disconnect2 doesn't send CLOSEREQ */ 591 dccp_disconnect2(dp); 592 dccp_output(dp, DCCP_TYPE_RESET + 2); 593 dccp_close(dp); 594 goto badunlocked; 595 } 596 optp = (u_char *)(drqh + 1); 597 598 /* store reference peer sequence number */ 599 dp->ref_pseq.hi = seqnr >> 24; 600 dp->ref_pseq.lo = (u_int64_t)(seqnr & 0xffffff); 601 } else 602 optp = (u_char *)(dalh + 1); 603 } else { 604 extrah_len = 4; 605 dah = (struct dccp_ackhdr *)(dh + 1); 606 optp = (u_char *)(dah + 1); 607 } 608 609 } 610 611 data_off = (dh->dh_off << 2); 612 613 dp->seq_rcv = seqnr; 614 dp->ack_rcv = 0; /* Clear it for now */ 615 dp->type_rcv = dh->dh_type; 616 dp->len_rcv = m->m_len - data_off - iphlen; /* Correct length ? */ 617 618 if (!is_shortseq) 619 optlen = data_off - (sizeof(struct dccplhdr) + extrah_len); 620 else 621 optlen = data_off - (sizeof(struct dccphdr) + extrah_len); 622 623 if (optlen < 0) { 624 DCCP_DEBUG((LOG_INFO, "Data offset is smaller then it could be, optlen = %i data_off = %i, m_len = %i, iphlen = %i extrah_len = %i !\n", optlen, data_off, m->m_len, iphlen, extrah_len)); 625 INP_UNLOCK(inp); 626 goto badunlocked; 627 } 628 629 if (optlen > 0) { 630 if (optlen > DCCP_MAX_OPTIONS) { 631 DCCP_DEBUG((LOG_INFO, "Error, more options (%i) then DCCP_MAX_OPTIONS options!\n", optlen)); 632 INP_UNLOCK(inp); 633 goto badunlocked; 634 } 635 636 DCCP_DEBUG((LOG_INFO, "Parsing DCCP options, optlen = %i\n", optlen)); 637 memcpy(options, optp, optlen); 638 dccp_parse_options(dp, options, optlen); 639 } 640 641 DCCP_DEBUG((LOG_INFO, "BEFORE state check, Got a %u packet while in %u state, who = %u!\n", dh->dh_type, dp->state, dp->who)); 642 643 if (dp->state == DCCPS_LISTEN) { 644 switch (dh->dh_type) { 645 646 case DCCP_TYPE_REQUEST: 647 DCCP_DEBUG((LOG_INFO, "Got DCCP REQUEST\n")); 648 dp->state = DCCPS_REQUEST; 649 if (dp->cc_in_use[1] < 0) { 650 test[0] = DEFAULT_CCID; 651 test[1] = 3; 652 dccp_add_feature(dp, DCCP_OPT_CHANGE_R, DCCP_FEATURE_CC, test, 2); 653 } 654 if (len > data_off) { 655 DCCP_DEBUG((LOG_INFO, "XXX: len=%d, data_off=%d\n", len, data_off)); 656 dccp_add_option(dp, DCCP_OPT_DATA_DISCARD, test, 0); 657 } 658 callout_reset(&dp->connect_timer, DCCP_CONNECT_TIMER, 659 dccp_connect_t, dp); 660 dccp_output(dp, 0); 661 break; 662 663 664 /* These are ok if the sender has a valid init Cookie */ 665 case DCCP_TYPE_ACK: 666 case DCCP_TYPE_DATAACK: 667 case DCCP_TYPE_DATA: 668 DCCP_DEBUG((LOG_INFO, "Got DCCP ACK/DATAACK/DATA, should check init cookie...\n")); 669 dccp_output(dp, DCCP_TYPE_RESET + 2); 670 break; 671 672 case DCCP_TYPE_RESET: 673 DCCP_DEBUG((LOG_INFO, "Got DCCP RESET\n")); 674 dp->state = DCCPS_TIME_WAIT; 675 dp = dccp_close(dp); 676 return; 677 678 default: 679 DCCP_DEBUG((LOG_INFO, "Got a %u packet while in listen stage!\n", dh->dh_type)); 680 /* Force send reset. */ 681 dccp_output(dp, DCCP_TYPE_RESET + 2); 682 } 683 } else if (dp->state == DCCPS_REQUEST) { 684 switch (dh->dh_type) { 685 case DCCP_TYPE_RESPONSE: 686 DAHDR_TO_DSEQ(dp->ack_rcv, ((struct dccp_acklhdr*)dalh)->dash); 687 dp->ack_snd = dp->seq_rcv; 688 DCCP_DEBUG((LOG_INFO, "Got DCCP REPSONSE %x %llx\n", dp, dp->ack_snd)); 689 690 callout_stop(&dp->retrans_timer); 691 callout_stop(&dp->connect_timer); 692 693 /* First check if we have negotiated a cc */ 694 if (dp->cc_in_use[0] > 0 && dp->cc_in_use[1] > 0) { 695 DCCP_DEBUG((LOG_INFO, "Setting DCCPS_ESTAB & soisconnected\n")); 696 dp->state = DCCPS_ESTAB; 697 dccpstat.dccps_connects++; 698 #if defined(INET6) 699 if (isipv6) 700 soisconnected(in6p->in6p_socket); 701 else 702 #endif 703 soisconnected(inp->inp_socket); 704 } else { 705 dp->state = DCCPS_RESPOND; 706 DCCP_DEBUG((LOG_INFO, "CC negotiation is not finished, cc_in_use[0] = %u, cc_in_use[1] = %u\n",dp->cc_in_use[0], dp->cc_in_use[1])); 707 708 } 709 dccp_output(dp, 0); 710 break; 711 712 case DCCP_TYPE_RESET: 713 DCCP_DEBUG((LOG_INFO, "Got DCCP RESET\n")); 714 dp->state = DCCPS_TIME_WAIT; 715 dp = dccp_close(dp); 716 return; 717 718 default: 719 DCCP_DEBUG((LOG_INFO, "Got a %u packet while in REQUEST stage!\n", dh->dh_type)); 720 /* Force send reset. */ 721 dccp_output(dp, DCCP_TYPE_RESET + 2); 722 if (dh->dh_type == DCCP_TYPE_CLOSE) { 723 dp = dccp_close(dp); 724 return; 725 } else { 726 callout_stop(&dp->retrans_timer); 727 dp->state = DCCPS_TIME_WAIT; 728 } 729 } 730 } else if (dp->state == DCCPS_RESPOND) { 731 switch (dh->dh_type) { 732 733 case DCCP_TYPE_REQUEST: 734 break; 735 case DCCP_TYPE_ACK: 736 case DCCP_TYPE_DATAACK: 737 DCCP_DEBUG((LOG_INFO, "Got DCCP ACK/DATAACK\n")); 738 739 callout_stop(&dp->connect_timer); 740 741 if (!is_shortseq) { 742 DAHDR_TO_DSEQ(dp->ack_rcv, ((struct dccp_acklhdr*)dalh)->dash); 743 } else { 744 /* shortseq XXX */ 745 dp->ack_rcv = CONVERT_TO_LONGSEQ((ntohl(dah->dash.dah_ack) >> 8), dp->ref_seq); 746 } 747 748 if (dp->cc_in_use[0] > 0 && dp->cc_in_use[1] > 0) { 749 DCCP_DEBUG((LOG_INFO, "Setting DCCPS_ESTAB & soisconnected\n")); 750 dp->state = DCCPS_ESTAB; 751 dccpstat.dccps_connects++; 752 #if defined(INET6) 753 if (isipv6) 754 soisconnected(in6p->in6p_socket); 755 else 756 #endif 757 soisconnected(inp->inp_socket); 758 } else { 759 DCCP_DEBUG((LOG_INFO, "CC negotiation is not finished, cc_in_use[0] = %u, cc_in_use[1] = %u\n",dp->cc_in_use[0], dp->cc_in_use[1])); 760 /* Force an output!!! */ 761 dp->ack_snd = dp->seq_rcv; 762 dccp_output(dp, 0); 763 } 764 765 if (dh->dh_type == DCCP_TYPE_DATAACK && dp->cc_in_use[1] > 0) { 766 if (!dp->ack_snd) dp->ack_snd = dp->seq_rcv; 767 DCCP_DEBUG((LOG_INFO, "Calling *cc_sw[%u].cc_recv_packet_recv!\n", dp->cc_in_use[1])); 768 (*cc_sw[dp->cc_in_use[1]].cc_recv_packet_recv)(dp->cc_state[1], options, optlen); 769 } 770 break; 771 772 case DCCP_TYPE_CLOSE: 773 dccp_output(dp, DCCP_TYPE_CLOSE + 1); 774 dp = dccp_close(dp); 775 goto badunlocked; 776 777 case DCCP_TYPE_RESET: 778 dp->state = DCCPS_TIME_WAIT; 779 callout_stop(&dp->retrans_timer); 780 break; 781 782 default: 783 DCCP_DEBUG((LOG_INFO, "Got a %u packet while in response stage!\n", dh->dh_type)); 784 /* Force send reset. */ 785 dccp_output(dp, DCCP_TYPE_RESET + 2); 786 } 787 } else if (dp->state == DCCPS_ESTAB) { 788 switch (dh->dh_type) { 789 790 case DCCP_TYPE_DATA: 791 DCCP_DEBUG((LOG_INFO, "Got DCCP DATA, state = %i, cc_in_use[1] = %u\n", dp->state, dp->cc_in_use[1])); 792 793 if (dp->cc_in_use[1] > 0) { 794 if (!dp->ack_snd) dp->ack_snd = dp->seq_rcv; 795 DCCP_DEBUG((LOG_INFO, "Calling data *cc_sw[%u].cc_recv_packet_recv! %llx %llx dp=%x\n", dp->cc_in_use[1], dp->ack_snd, dp->seq_rcv, dp)); 796 (*cc_sw[dp->cc_in_use[1]].cc_recv_packet_recv)(dp->cc_state[1], options, optlen); 797 } 798 break; 799 800 case DCCP_TYPE_ACK: 801 DCCP_DEBUG((LOG_INFO, "Got DCCP ACK\n")); 802 if (!is_shortseq) { 803 DAHDR_TO_DSEQ(dp->ack_rcv, ((struct dccp_acklhdr*)dalh)->dash); 804 } else { 805 /* shortseq */ 806 dp->ack_rcv = CONVERT_TO_LONGSEQ((ntohl(dah->dash.dah_ack) >> 8), dp->ref_seq); 807 } 808 809 if (dp->cc_in_use[1] > 0) { 810 /* This is called so Acks on Acks can be handled */ 811 if (!dp->ack_snd) dp->ack_snd = dp->seq_rcv; 812 DCCP_DEBUG((LOG_INFO, "Calling ACK *cc_sw[%u].cc_recv_packet_recv! %llx %llx\n", dp->cc_in_use[1], dp->ack_snd, dp->seq_rcv)); 813 (*cc_sw[dp->cc_in_use[1]].cc_recv_packet_recv)(dp->cc_state[1], options, optlen); 814 } 815 break; 816 817 case DCCP_TYPE_DATAACK: 818 DCCP_DEBUG((LOG_INFO, "Got DCCP DATAACK\n")); 819 820 if (!is_shortseq) { 821 DAHDR_TO_DSEQ(dp->ack_rcv, ((struct dccp_acklhdr*)dalh)->dash); 822 } else { 823 /* shortseq */ 824 dp->ack_rcv = CONVERT_TO_LONGSEQ((ntohl(dah->dash.dah_ack) >> 8), dp->ref_seq); 825 } 826 827 if (dp->cc_in_use[1] > 0) { 828 if (!dp->ack_snd) dp->ack_snd = dp->seq_rcv; 829 DCCP_DEBUG((LOG_INFO, "Calling *cc_sw[%u].cc_recv_packet_recv! %llx %llx\n", dp->cc_in_use[1], dp->ack_snd, dp->seq_rcv)); 830 (*cc_sw[dp->cc_in_use[1]].cc_recv_packet_recv)(dp->cc_state[1], options, optlen); 831 } 832 break; 833 834 case DCCP_TYPE_CLOSEREQ: 835 DCCP_DEBUG((LOG_INFO, "Got DCCP CLOSEREQ, state = estab\n")); 836 if (dp->who == DCCP_CLIENT) { 837 dccp_disconnect2(dp); 838 } else { 839 dccp_output(dp, DCCP_TYPE_RESET + 2); 840 } 841 break; 842 843 case DCCP_TYPE_CLOSE: 844 DCCP_DEBUG((LOG_INFO, "Got DCCP CLOSE, state = estab\n")); 845 dp->state = DCCPS_SERVER_CLOSE; /* So disconnect2 doesn't send CLOSEREQ */ 846 dccp_disconnect2(dp); 847 dccp_output(dp, DCCP_TYPE_RESET + 2); 848 dccp_close(dp); 849 goto badunlocked; 850 break; 851 852 case DCCP_TYPE_RESET: 853 DCCP_DEBUG((LOG_INFO, "Got DCCP RESET\n")); 854 dp->state = DCCPS_TIME_WAIT; 855 callout_stop(&dp->retrans_timer); 856 callout_reset(&dp->timewait_timer, DCCP_TIMEWAIT_TIMER, 857 dccp_timewait_t, dp); 858 break; 859 860 case DCCP_TYPE_MOVE: 861 DCCP_DEBUG((LOG_INFO, "Got DCCP MOVE\n")); 862 break; 863 864 default: 865 DCCP_DEBUG((LOG_INFO, "Got a %u packet while in established stage!\n", dh->dh_type)); 866 } 867 868 } else if (dp->state == DCCPS_SERVER_CLOSE) { 869 /* Server */ 870 switch (dh->dh_type) { 871 case DCCP_TYPE_CLOSE: 872 DCCP_DEBUG((LOG_INFO, "Got DCCP CLOSE (State DCCPS_SERVER_CLOSE)\n")); 873 callout_stop(&dp->retrans_timer); 874 dccp_output(dp, DCCP_TYPE_RESET + 2); 875 dp = dccp_close(dp); 876 goto badunlocked; 877 878 case DCCP_TYPE_RESET: 879 DCCP_DEBUG((LOG_INFO, "Got DCCP RESET\n")); 880 callout_stop(&dp->retrans_timer); 881 dccp_output(dp, DCCP_TYPE_RESET + 2); 882 dp->state = DCCPS_TIME_WAIT; 883 break; 884 default: 885 DCCP_DEBUG((LOG_INFO, "Got a %u packet while in server_close stage!\n", dh->dh_type)); 886 } 887 888 } else if (dp->state == DCCPS_CLIENT_CLOSE) { 889 /* Client */ 890 switch (dh->dh_type) { 891 case DCCP_TYPE_CLOSE: 892 /* Ignore */ 893 break; 894 case DCCP_TYPE_CLOSEREQ: 895 DCCP_DEBUG((LOG_INFO, "Got DCCP CLOSEREQ, state = DCCPS_CLIENT_CLOSE\n")); 896 /* Just resend close */ 897 dccp_output(dp, 0); 898 break; 899 case DCCP_TYPE_RESET: 900 DCCP_DEBUG((LOG_INFO, "Got DCCP RESET\n")); 901 callout_stop(&dp->retrans_timer); 902 dp->state = DCCPS_TIME_WAIT; 903 callout_reset(&dp->timewait_timer, DCCP_TIMEWAIT_TIMER, 904 dccp_timewait_t, dp); 905 break; 906 default: 907 DCCP_DEBUG((LOG_INFO, "Got a %u packet while in client_close stage!\n", dh->dh_type)); 908 909 } 910 } else { 911 DCCP_DEBUG((LOG_INFO, "Got a %u packet while in %u state!\n", dh->dh_type, dp->state)); 912 if (dh->dh_type != DCCP_TYPE_RESET) { 913 /* Force send reset. */ 914 DCCP_DEBUG((LOG_INFO, "Force sending a request!\n")); 915 dccp_output(dp, DCCP_TYPE_RESET + 2); 916 } 917 } 918 919 if (dh->dh_type == DCCP_TYPE_DATA || 920 dh->dh_type == DCCP_TYPE_ACK || 921 dh->dh_type == DCCP_TYPE_DATAACK) { 922 if (dp->cc_in_use[0] > 0) { 923 (*cc_sw[dp->cc_in_use[0]].cc_send_packet_recv)(dp->cc_state[0],options, optlen); 924 } 925 926 } 927 928 if (dh->dh_type == DCCP_TYPE_DATA || dh->dh_type == DCCP_TYPE_DATAACK) { 929 if (so->so_state & SS_CANTRCVMORE) 930 { 931 DCCP_DEBUG((LOG_INFO, "state & SS_CANTRCVMORE...!\n")); 932 m_freem(m); 933 if (opts) 934 m_freem(opts); 935 } else { 936 m_adj(m, (iphlen + data_off)); 937 DCCP_DEBUG((LOG_INFO, "Calling sbappend!\n")); 938 sbappend(&so->so_rcv, m); 939 } 940 DCCP_DEBUG((LOG_INFO, "Calling sorwakeup...!\n")); 941 sorwakeup(so); 942 } else { 943 m_freem(m); 944 if (opts) 945 m_freem(opts); 946 } 947 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000 948 if (dp) 949 INP_UNLOCK(inp); 950 #endif 951 952 return; 953 954 badunlocked: 955 m_freem(m); 956 if (opts) 957 m_freem(opts); 958 return; 959 } 960 961 /* 962 * Notify a dccp user of an asynchronous error; 963 * just wake up so that he can collect error status. 964 */ 965 void 966 dccp_notify(struct inpcb *inp, int errno) 967 { 968 inp->inp_socket->so_error = errno; 969 sorwakeup(inp->inp_socket); 970 sowwakeup(inp->inp_socket); 971 return; 972 } 973 974 /* 975 * Called when we get ICMP errors (destination unrechable, 976 * parameter problem, source quench, time exceeded and redirects) 977 */ 978 void * 979 dccp_ctlinput(int cmd, const struct sockaddr *sa, void *vip) 980 { 981 struct ip *ip = vip; 982 struct dccphdr *dh; 983 void (*notify)(struct inpcb *, int) = dccp_notify; 984 struct in_addr faddr; 985 struct inpcb *inp = NULL; 986 987 faddr = ((const struct sockaddr_in *)sa)->sin_addr; 988 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 989 return NULL; 990 991 if (PRC_IS_REDIRECT(cmd)) { 992 ip = 0; 993 notify = in_rtchange; 994 } else if (cmd == PRC_HOSTDEAD) 995 ip = 0; 996 else if ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0) 997 return NULL; 998 if (ip) { 999 /*s = splsoftnet();*/ 1000 dh = (struct dccphdr *)((vaddr_t)ip + (ip->ip_hl << 2)); 1001 INP_INFO_RLOCK(&dccpbinfo); 1002 in_pcbnotify(&dccpbtable, faddr, dh->dh_dport, 1003 ip->ip_src, dh->dh_sport, inetctlerrmap[cmd], notify); 1004 if (inp != NULL) { 1005 INP_LOCK(inp); 1006 if (inp->inp_socket != NULL) { 1007 (*notify)(inp, inetctlerrmap[cmd]); 1008 } 1009 INP_UNLOCK(inp); 1010 } 1011 INP_INFO_RUNLOCK(&dccpbinfo); 1012 /*splx(s);*/ 1013 } else 1014 in_pcbnotifyall(&dccpbtable, faddr, inetctlerrmap[cmd], notify); 1015 1016 return NULL; 1017 } 1018 1019 static int 1020 dccp_optsset(struct dccpcb *dp, struct sockopt *sopt) 1021 { 1022 int optval; 1023 int error = 0; 1024 1025 switch (sopt->sopt_name) { 1026 case DCCP_CCID: 1027 error = sockopt_getint(sopt, &optval); 1028 /* Add check that optval is a CCID we support!!! */ 1029 if (optval == 2 || optval == 3 || optval == 0) { 1030 dp->pref_cc = optval; 1031 } else { 1032 error = EINVAL; 1033 } 1034 break; 1035 case DCCP_CSLEN: 1036 error = sockopt_getint(sopt, &optval); 1037 if (optval > 15 || optval < 0) { 1038 error = EINVAL; 1039 } else { 1040 dp->cslen = optval; 1041 } 1042 break; 1043 case DCCP_MAXSEG: 1044 error = sockopt_getint(sopt, &optval); 1045 if (optval > 0 && optval <= dp->d_maxseg) { 1046 dp->d_maxseg = optval; 1047 } else { 1048 error = EINVAL; 1049 } 1050 break; 1051 case DCCP_SERVICE: 1052 error = sockopt_getint(sopt, &optval); 1053 dp->scode = optval; 1054 break; 1055 1056 default: 1057 error = ENOPROTOOPT; 1058 } 1059 1060 return error; 1061 } 1062 1063 static int 1064 dccp_optsget(struct dccpcb *dp, struct sockopt *sopt) 1065 { 1066 int optval = 0; 1067 int error = 0; 1068 1069 switch (sopt->sopt_name) { 1070 case DCCP_CCID: 1071 optval = dp->pref_cc; 1072 error = sockopt_set(sopt, &optval, sizeof(optval)); 1073 break; 1074 case DCCP_CSLEN: 1075 optval = dp->cslen; 1076 error = sockopt_set(sopt, &optval, sizeof(optval)); 1077 break; 1078 case DCCP_MAXSEG: 1079 optval = dp->d_maxseg; 1080 error = sockopt_set(sopt, &optval, sizeof(optval)); 1081 break; 1082 case DCCP_SERVICE: 1083 optval = dp->scode; 1084 error = sockopt_set(sopt, &optval, sizeof(optval)); 1085 break; 1086 default: 1087 error = ENOPROTOOPT; 1088 } 1089 1090 return error; 1091 } 1092 1093 /* 1094 * Called by getsockopt and setsockopt. 1095 * 1096 */ 1097 int 1098 dccp_ctloutput(int op, struct socket *so, struct sockopt *sopt) 1099 { 1100 int s, error = 0; 1101 struct inpcb *inp; 1102 #if defined(INET6) 1103 struct in6pcb *in6p; 1104 #endif 1105 struct dccpcb *dp; 1106 int family; /* family of the socket */ 1107 1108 family = so->so_proto->pr_domain->dom_family; 1109 error = 0; 1110 1111 s = splsoftnet(); 1112 INP_INFO_RLOCK(&dccpbinfo); 1113 switch (family) { 1114 case PF_INET: 1115 inp = sotoinpcb(so); 1116 #if defined(INET6) 1117 in6p = NULL; 1118 #endif 1119 break; 1120 #if defined(INET6) 1121 case PF_INET6: 1122 inp = NULL; 1123 in6p = sotoin6pcb(so); 1124 break; 1125 #endif 1126 default: 1127 INP_INFO_RUNLOCK(&dccpbinfo); 1128 splx(s); 1129 return EAFNOSUPPORT; 1130 } 1131 #if defined(INET6) 1132 if (inp == NULL && in6p == NULL) 1133 #else 1134 if (inp == NULL) 1135 #endif 1136 { 1137 INP_INFO_RUNLOCK(&dccpbinfo); 1138 splx(s); 1139 return (ECONNRESET); 1140 } 1141 /* 1142 if (inp) 1143 INP_LOCK(inp); 1144 else 1145 IN6P_LOCK(in6p); 1146 INP_INFO_RUNLOCK(&dccpbinfo); 1147 */ 1148 if (sopt->sopt_level != IPPROTO_DCCP) { 1149 switch (family) { 1150 case PF_INET: 1151 error = ip_ctloutput(op, so, sopt); 1152 break; 1153 #if defined(INET6) 1154 case PF_INET6: 1155 error = ip6_ctloutput(op, so, sopt); 1156 break; 1157 #endif 1158 } 1159 splx(s); 1160 return (error); 1161 } 1162 1163 if (inp) 1164 dp = intodccpcb(inp); 1165 #if defined(INET6) 1166 else if (in6p) 1167 dp = in6todccpcb(in6p); 1168 #endif 1169 else 1170 dp = NULL; 1171 1172 if (op == PRCO_SETOPT) { 1173 error = dccp_optsset(dp, sopt); 1174 } else if (op == PRCO_GETOPT) { 1175 error = dccp_optsget(dp, sopt); 1176 } else { 1177 error = EINVAL; 1178 } 1179 /* 1180 if (inp) 1181 INP_UNLOCK(inp); 1182 else 1183 IN6P_UNLOCK(in6p); 1184 */ 1185 splx(s); 1186 return error; 1187 } 1188 1189 int 1190 dccp_output(struct dccpcb *dp, u_int8_t extra) 1191 { 1192 struct inpcb *inp; 1193 struct in6pcb *in6p = NULL; 1194 struct socket *so; 1195 struct mbuf *m; 1196 1197 struct ip *ip = NULL; 1198 struct dccphdr *dh; 1199 struct dccplhdr *dlh; 1200 struct dccp_requesthdr *drqh; 1201 struct dccp_ackhdr *dah; 1202 struct dccp_acklhdr *dalh; 1203 struct dccp_resethdr *drth; 1204 u_char *optp = NULL; 1205 int error = 0; 1206 int off, sendalot, t, i; 1207 u_int32_t hdrlen, optlen, extrah_len, cslen; 1208 u_int8_t type; 1209 char options[DCCP_MAX_OPTIONS *2]; 1210 long len, pktlen; 1211 int isipv6 = 0; 1212 int use_shortseq = 0; 1213 #ifdef INET6 1214 struct ip6_hdr *ip6 = NULL; 1215 #endif 1216 1217 DCCP_DEBUG((LOG_INFO, "dccp_output start!\n")); 1218 1219 isipv6 = (dp->inp_vflag & INP_IPV6) != 0; 1220 1221 DCCP_DEBUG((LOG_INFO, "Going to send a DCCP packet!\n")); 1222 #if defined(__FreeBSD__) && __FreeBSD_version >= 500000 1223 KASSERT(mutex_assert(&dp->d_inpcb->inp_mtx, MA_OWNED)); 1224 #endif 1225 1226 #if defined(INET6) 1227 if (isipv6) { 1228 inp = 0; 1229 in6p = dp->d_in6pcb; 1230 so = in6p->in6p_socket; 1231 } else 1232 #endif 1233 { 1234 inp = dp->d_inpcb; 1235 so = inp->inp_socket; 1236 } 1237 1238 if (dp->state != DCCPS_ESTAB && extra == 1) { 1239 /* Only let cc decide when to resend if we are in establised state */ 1240 return 0; 1241 } 1242 1243 if (so->so_snd.sb_cc){ 1244 pktlen = dp->pktlen[dp->pktlenidx]; 1245 } else 1246 pktlen = 0; 1247 1248 /* Check with CC if we can send... */ 1249 if (pktlen && dp->cc_in_use[0] > 0 && dp->state == DCCPS_ESTAB) { 1250 if (!(*cc_sw[dp->cc_in_use[0]].cc_send_packet)(dp->cc_state[0], pktlen)) { 1251 DCCP_DEBUG((LOG_INFO, "Not allowed to send right now\n")); 1252 return 0; 1253 } 1254 } 1255 1256 if (pktlen) { 1257 dp->pktcnt --; 1258 dp->pktlenidx = (dp->pktlenidx +1) % DCCP_MAX_PKTS; 1259 } 1260 1261 again: 1262 sendalot = 0; 1263 1264 /* 1265 * off not needed for dccp because we do not need to wait for ACK 1266 * before removing the packet 1267 */ 1268 off = 0; 1269 optlen = 0; 1270 1271 if (pktlen > dp->d_maxseg) { 1272 /* this should not happen */ 1273 DCCP_DEBUG((LOG_INFO, "packet will be fragmented! maxseg %d\n", dp->d_maxseg)); 1274 len = dp->d_maxseg; 1275 pktlen -= len; 1276 sendalot = 1; 1277 } else 1278 len = pktlen; 1279 1280 if (extra == DCCP_TYPE_RESET + 2) { 1281 DCCP_DEBUG((LOG_INFO, "Force sending of DCCP TYPE_RESET! seq=%llu\n", dp->seq_snd)); 1282 type = DCCP_TYPE_RESET; 1283 extrah_len = 12; 1284 } else if (dp->state <= DCCPS_REQUEST && dp->who == DCCP_CLIENT) { 1285 DCCP_DEBUG((LOG_INFO, "Sending DCCP TYPE_REQUEST!\n")); 1286 type = DCCP_TYPE_REQUEST; 1287 dp->state = DCCPS_REQUEST; 1288 extrah_len = 4; 1289 } else if (dp->state == DCCPS_REQUEST && dp->who == DCCP_SERVER) { 1290 DCCP_DEBUG((LOG_INFO, "Sending DCCP TYPE_RESPONSE!\n")); 1291 type = DCCP_TYPE_RESPONSE; 1292 dp->state = DCCPS_RESPOND; 1293 extrah_len = 12; 1294 } else if (dp->state == DCCPS_RESPOND) { 1295 DCCP_DEBUG((LOG_INFO, "Still in feature neg, sending DCCP TYPE_ACK!\n")); 1296 type = DCCP_TYPE_ACK; 1297 if (!dp->shortseq) 1298 extrah_len = 8; 1299 else { 1300 extrah_len = 4; 1301 use_shortseq = 1; 1302 } 1303 } else if (dp->state == DCCPS_ESTAB) { 1304 if (dp->ack_snd && len) { 1305 DCCP_DEBUG((LOG_INFO, "Sending DCCP TYPE_DATAACK!\n")); 1306 type = DCCP_TYPE_DATAACK; 1307 /*(u_int32_t *)&extrah = dp->seq_rcv; */ 1308 if (!dp->shortseq) 1309 extrah_len = 8; 1310 else { 1311 extrah_len = 4; 1312 use_shortseq = 1; 1313 } 1314 } else if (dp->ack_snd) { 1315 DCCP_DEBUG((LOG_INFO, "Sending DCCP TYPE_ACK!\n")); 1316 type = DCCP_TYPE_ACK; 1317 if (!dp->shortseq) 1318 extrah_len = 8; 1319 else { 1320 extrah_len = 4; 1321 use_shortseq = 1; 1322 } 1323 } else if (len) { 1324 DCCP_DEBUG((LOG_INFO, "Sending DCCP TYPE_DATA!\n")); 1325 type = DCCP_TYPE_DATA; 1326 extrah_len = 0; 1327 } else { 1328 DCCP_DEBUG((LOG_INFO, "No ack or data to send!\n")); 1329 return 0; 1330 } 1331 } else if (dp->state == DCCPS_CLIENT_CLOSE) { 1332 DCCP_DEBUG((LOG_INFO, "Sending DCCP TYPE_CLOSE!\n")); 1333 type = DCCP_TYPE_CLOSE; 1334 extrah_len = 8; 1335 } else if (dp->state == DCCPS_SERVER_CLOSE) { 1336 DCCP_DEBUG((LOG_INFO, "Sending DCCP TYPE_CLOSEREQ!\n")); 1337 type = DCCP_TYPE_CLOSEREQ; 1338 extrah_len = 8; 1339 } else { 1340 DCCP_DEBUG((LOG_INFO, "Hey, we should never get here, state = %u\n", dp->state)); 1341 return 1; 1342 } 1343 1344 /* Adding options. */ 1345 if (dp->optlen) { 1346 DCCP_DEBUG((LOG_INFO, "Copying options from dp->options! %u\n", dp->optlen)); 1347 memcpy(options, dp->options, dp->optlen); 1348 optlen = dp->optlen; 1349 dp->optlen = 0; 1350 } 1351 1352 if (dp->featlen && (optlen + dp->featlen < DCCP_MAX_OPTIONS)) { 1353 DCCP_DEBUG((LOG_INFO, "Copying options from dp->features! %u\n", dp->featlen)); 1354 memcpy(options + optlen, dp->features, dp->featlen); 1355 optlen += dp->featlen; 1356 } 1357 1358 t = optlen % 4; 1359 1360 if (t) { 1361 t = 4 - t; 1362 for (i = 0 ; i<t; i++) { 1363 options[optlen] = 0; 1364 optlen++; 1365 } 1366 } 1367 1368 #ifdef INET6 1369 if (isipv6) { 1370 DCCP_DEBUG((LOG_INFO, "Sending ipv6 packet...\n")); 1371 if (!use_shortseq) 1372 hdrlen = sizeof(struct ip6_hdr) + sizeof(struct dccplhdr) + 1373 extrah_len + optlen; 1374 else 1375 hdrlen = sizeof(struct ip6_hdr) + sizeof(struct dccphdr) + 1376 extrah_len + optlen; 1377 } else 1378 #endif 1379 { 1380 if (!use_shortseq) 1381 hdrlen = sizeof(struct ip) + sizeof(struct dccplhdr) + 1382 extrah_len + optlen; 1383 else 1384 hdrlen = sizeof(struct ip) + sizeof(struct dccphdr) + 1385 extrah_len + optlen; 1386 } 1387 DCCP_DEBUG((LOG_INFO, "Pkt headerlen %u\n", hdrlen)); 1388 1389 if (len > (dp->d_maxseg - extrah_len - optlen)) { 1390 len = dp->d_maxseg - extrah_len - optlen; 1391 sendalot = 1; 1392 } 1393 1394 MGETHDR(m, M_DONTWAIT, MT_HEADER); 1395 if (m == NULL) { 1396 error = ENOBUFS; 1397 goto release; 1398 } 1399 if (MHLEN < hdrlen + max_linkhdr) { 1400 MCLGET(m, M_DONTWAIT); 1401 if ((m->m_flags & M_EXT) == 0) { 1402 error = ENOBUFS; 1403 goto release; 1404 } 1405 } 1406 1407 m->m_data += max_linkhdr; 1408 m->m_len = hdrlen; 1409 1410 if (len) { /* We have data to send */ 1411 if (len <= M_TRAILINGSPACE(m) - hdrlen) { 1412 m_copydata(so->so_snd.sb_mb, off, (int) len, 1413 mtod(m, char *) + hdrlen); 1414 m->m_len += len; 1415 } else { 1416 m->m_next = m_copym(so->so_snd.sb_mb, off, 1417 (int)len, M_DONTWAIT); 1418 if (m->m_next == 0) { 1419 error = ENOBUFS; 1420 goto release; 1421 } 1422 } 1423 } else { 1424 dp->ndp++; 1425 } 1426 1427 m_reset_rcvif(m); 1428 1429 if (!isipv6 && (len + hdrlen) > IP_MAXPACKET) { 1430 error = EMSGSIZE; 1431 goto release; 1432 } 1433 1434 /* 1435 * Fill in mbuf with extended DCCP header 1436 * and addresses and length put into network format. 1437 */ 1438 #ifdef INET6 1439 if (isipv6) { 1440 ip6 = mtod(m, struct ip6_hdr *); 1441 dh = (struct dccphdr *)(ip6 + 1); 1442 ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) | 1443 (in6p->in6p_flowinfo & IPV6_FLOWINFO_MASK); 1444 ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) | 1445 (IPV6_VERSION & IPV6_VERSION_MASK); 1446 ip6->ip6_nxt = IPPROTO_DCCP; 1447 ip6->ip6_src = in6p->in6p_laddr; 1448 ip6->ip6_dst = in6p->in6p_faddr; 1449 } else 1450 #endif 1451 { 1452 ip = mtod(m, struct ip *); 1453 dh = (struct dccphdr *)(ip + 1); 1454 memset(ip, 0, sizeof(struct ip)); 1455 ip->ip_p = IPPROTO_DCCP; 1456 ip->ip_src = inp->inp_laddr; 1457 ip->ip_dst = inp->inp_faddr; 1458 } 1459 dlh = (struct dccplhdr *)dh; 1460 1461 if (inp) { 1462 dh->dh_sport = inp->inp_lport; 1463 dh->dh_dport = inp->inp_fport; 1464 } 1465 #ifdef INET6 1466 else if (in6p) { 1467 dh->dh_sport = in6p->in6p_lport; 1468 dh->dh_dport = in6p->in6p_fport; 1469 } 1470 #endif 1471 dh->dh_cscov = dp->cslen; 1472 dh->dh_ccval = dp->ccval; 1473 dh->dh_type = type; 1474 dh->dh_res = 0; /* Reserved field should be zero */ 1475 if (!use_shortseq) { 1476 dlh->dh_res2 = 0; /* Reserved field should be zero */ 1477 dh->dh_off = 4 + (extrah_len / 4) + (optlen / 4); 1478 } else 1479 dh->dh_off = 3 + (extrah_len / 4) + (optlen / 4); 1480 1481 dp->seq_snd = (dp->seq_snd +1) % 281474976710656LL; 1482 if (!use_shortseq) { 1483 DSEQ_TO_DHDR(dlh, dp->seq_snd); 1484 dlh->dh_x = 1; 1485 } else { 1486 /* short sequene number */ 1487 dh->dh_seq = htonl(dp->seq_snd) >> 8; 1488 dh->dh_x = 0; 1489 } 1490 1491 if (!use_shortseq) { 1492 DCCP_DEBUG((LOG_INFO, "Sending with seq %x.%x, (dp->seq_snd = %llu)\n\n", dlh->dh_seq, dlh->dh_seq2, dp->seq_snd)); 1493 } else { 1494 DCCP_DEBUG((LOG_INFO, "Sending with seq %x, (dp->seq_snd = %llu)\n\n", dh->dh_seq, dp->seq_snd)); 1495 } 1496 1497 if (dh->dh_type == DCCP_TYPE_REQUEST) { 1498 drqh = (struct dccp_requesthdr *)(dlh + 1); 1499 drqh->drqh_scode = dp->scode; 1500 optp = (u_char *)(drqh + 1); 1501 } else if (dh->dh_type == DCCP_TYPE_RESET) { 1502 drth = (struct dccp_resethdr *)(dlh + 1); 1503 drth->drth_dash.dah_res = 0; 1504 DSEQ_TO_DAHDR(drth->drth_dash, dp->seq_rcv); 1505 if (dp->state == DCCPS_SERVER_CLOSE) 1506 drth->drth_reason = 1; 1507 else 1508 drth->drth_reason = 2; 1509 drth->drth_data1 = 0; 1510 drth->drth_data2 = 0; 1511 drth->drth_data3 = 0; 1512 optp = (u_char *)(drth + 1); 1513 } else if (extrah_len) { 1514 if (!use_shortseq){ 1515 dalh = (struct dccp_acklhdr *)(dlh + 1); 1516 dalh->dash.dah_res = 0; /* Reserved field should be zero */ 1517 1518 if (dp->state == DCCPS_ESTAB) { 1519 DSEQ_TO_DAHDR(dalh->dash, dp->ack_snd); 1520 dp->ack_snd = 0; 1521 } else { 1522 DSEQ_TO_DAHDR(dalh->dash, dp->seq_rcv); 1523 } 1524 1525 if (dh->dh_type == DCCP_TYPE_RESPONSE) { 1526 DCCP_DEBUG((LOG_INFO, "Sending dccp type response\n")); 1527 drqh = (struct dccp_requesthdr *)(dalh + 1); 1528 drqh->drqh_scode = dp->scode; 1529 optp = (u_char *)(drqh + 1); 1530 } else 1531 optp = (u_char *)(dalh + 1); 1532 } else { 1533 /* XXX shortseq */ 1534 dah = (struct dccp_ackhdr *)(dh + 1); 1535 dah->dash.dah_res = 0; /* Reserved field should be zero */ 1536 dah->dash.dah_ack = htonl(dp->seq_rcv) >> 8; 1537 optp = (u_char *)(dah + 1); 1538 } 1539 1540 } else { 1541 optp = (u_char *)(dlh + 1); 1542 } 1543 1544 if (optlen) 1545 memcpy(optp, options, optlen); 1546 1547 m->m_pkthdr.len = hdrlen + len; 1548 1549 if (dh->dh_cscov == 0) { 1550 #ifdef INET6 1551 if (isipv6) 1552 cslen = (hdrlen - sizeof(struct ip6_hdr)) + len; 1553 else 1554 cslen = (hdrlen - sizeof(struct ip)) + len; 1555 #else 1556 cslen = (hdrlen - sizeof(struct ip)) + len; 1557 #endif 1558 } else { 1559 cslen = dh->dh_off * 4 + (dh->dh_cscov - 1) * 4; 1560 #ifdef INET6 1561 if (isipv6) { 1562 if (cslen > (hdrlen - sizeof(struct ip6_hdr)) + len) 1563 cslen = (hdrlen - sizeof(struct ip6_hdr)) + len; 1564 } else { 1565 if (cslen > (hdrlen - sizeof(struct ip)) + len) 1566 cslen = (hdrlen - sizeof(struct ip)) + len; 1567 } 1568 #else 1569 if (cslen > (hdrlen - sizeof(struct ip)) + len) 1570 cslen = (hdrlen - sizeof(struct ip)) + len; 1571 #endif 1572 } 1573 1574 /* 1575 * Set up checksum 1576 */ 1577 m->m_pkthdr.csum_flags = 0; 1578 1579 dh->dh_sum = 0; 1580 #ifdef INET6 1581 if (isipv6) { 1582 dh->dh_sum = in6_cksum(m, IPPROTO_DCCP, sizeof(struct ip6_hdr), 1583 cslen); 1584 } else 1585 #endif 1586 { 1587 ip->ip_len = htons(hdrlen + len); 1588 ip->ip_ttl = dp->inp_ip_ttl; /* XXX */ 1589 ip->ip_tos = dp->inp_ip_tos; /* XXX */ 1590 1591 dh->dh_sum = in4_cksum(m, IPPROTO_DCCP, sizeof(struct ip), 1592 cslen); 1593 #ifndef __OpenBSD__ 1594 m->m_pkthdr.csum_data = offsetof(struct dccphdr, dh_sum); 1595 #endif 1596 } 1597 1598 dccpstat.dccps_opackets++; 1599 dccpstat.dccps_obytes += m->m_pkthdr.len; 1600 1601 #ifdef INET6 1602 if (isipv6) { 1603 DCCP_DEBUG((LOG_INFO, "Calling ip_output6, mbuf->m_len = %u, mbuf->m_pkthdr.len = %u\n", m->m_len, m->m_pkthdr.len)); 1604 1605 error = ip6_output(m, in6p->in6p_outputopts, &in6p->in6p_route, 1606 (in6p->in6p_socket->so_options & SO_DONTROUTE), NULL, NULL, 1607 NULL); 1608 } else 1609 #endif 1610 { 1611 DCCP_DEBUG((LOG_INFO, "Calling ip_output, mbuf->m_len = %u, mbuf->m_pkthdr.len = %u\n", m->m_len, m->m_pkthdr.len)); 1612 error = ip_output(m, inp->inp_options, &inp->inp_route, 1613 (inp->inp_socket->so_options & SO_DONTROUTE), 0, 1614 inp); 1615 } 1616 1617 if (error) { 1618 DCCP_DEBUG((LOG_INFO, "IP output failed! %d\n", error)); 1619 return (error); 1620 } 1621 1622 #if defined(INET6) 1623 if (isipv6) { 1624 sbdrop(&in6p->in6p_socket->so_snd, len); 1625 sowwakeup(in6p->in6p_socket); 1626 } else 1627 #endif 1628 { 1629 sbdrop(&inp->inp_socket->so_snd, len); 1630 sowwakeup(inp->inp_socket); 1631 } 1632 1633 if (dp->cc_in_use[0] > 0 && dp->state == DCCPS_ESTAB) { 1634 DCCP_DEBUG((LOG_INFO, "Calling *cc_sw[%u].cc_send_packet_sent!\n", dp->cc_in_use[0])); 1635 if (sendalot) { 1636 (*cc_sw[dp->cc_in_use[0]].cc_send_packet_sent)(dp->cc_state[0], 1,len); 1637 goto again; 1638 } else { 1639 (*cc_sw[dp->cc_in_use[0]].cc_send_packet_sent)(dp->cc_state[0], 0,len); 1640 } 1641 } else { 1642 if (sendalot) 1643 goto again; 1644 } 1645 1646 DCCP_DEBUG((LOG_INFO, "dccp_output finished\n")); 1647 1648 return (0); 1649 1650 release: 1651 m_freem(m); 1652 return (error); 1653 } 1654 1655 int 1656 dccp_abort(struct socket *so) 1657 { 1658 struct inpcb *inp = 0; 1659 struct in6pcb *in6p; 1660 struct dccpcb *dp; 1661 1662 DCCP_DEBUG((LOG_INFO, "Entering dccp_abort!\n")); 1663 INP_INFO_WLOCK(&dccpbinfo); 1664 if (so->so_proto->pr_domain->dom_family == PF_INET6) { 1665 in6p = sotoin6pcb(so); 1666 if (in6p == 0) { 1667 return EINVAL; 1668 } 1669 inp = 0; 1670 dp = (struct dccpcb *)in6p->in6p_ppcb; 1671 } else { 1672 inp = sotoinpcb(so); 1673 if (inp == 0) { 1674 INP_INFO_WUNLOCK(&dccpbinfo); 1675 return EINVAL; 1676 } 1677 dp = (struct dccpcb *)inp->inp_ppcb; 1678 } 1679 1680 dccp_disconnect2(dp); 1681 1682 INP_INFO_WUNLOCK(&dccpbinfo); 1683 return 0; 1684 } 1685 1686 static struct dccpcb * 1687 dccp_close(struct dccpcb *dp) 1688 { 1689 struct socket *so; 1690 struct inpcb *inp = dp->d_inpcb; 1691 struct in6pcb *in6p = dp->d_in6pcb; 1692 so = dptosocket(dp); 1693 1694 DCCP_DEBUG((LOG_INFO, "Entering dccp_close!\n")); 1695 1696 /* Stop all timers */ 1697 callout_stop(&dp->connect_timer); 1698 callout_stop(&dp->retrans_timer); 1699 callout_stop(&dp->close_timer); 1700 callout_stop(&dp->timewait_timer); 1701 1702 if (dp->cc_in_use[0] > 0) 1703 (*cc_sw[dp->cc_in_use[0]].cc_send_free)(dp->cc_state[0]); 1704 if (dp->cc_in_use[1] > 0) 1705 (*cc_sw[dp->cc_in_use[1]].cc_recv_free)(dp->cc_state[1]); 1706 1707 pool_put(&dccpcb_pool, dp); 1708 if (inp) { 1709 inp->inp_ppcb = NULL; 1710 soisdisconnected(so); 1711 in_pcbdetach(inp); 1712 } 1713 #if defined(INET6) 1714 else if (in6p) { 1715 in6p->in6p_ppcb = 0; 1716 soisdisconnected(so); 1717 in6_pcbdetach(in6p); 1718 } 1719 #endif 1720 return ((struct dccpcb *)0); 1721 } 1722 1723 /* 1724 * Runs when a new socket is created with the 1725 * socket system call or sonewconn. 1726 */ 1727 int 1728 dccp_attach(struct socket *so, int proto) 1729 { 1730 struct inpcb *inp = 0; 1731 struct in6pcb *in6p = 0; 1732 struct dccpcb *dp; 1733 int s, family, error = 0; 1734 1735 DCCP_DEBUG((LOG_INFO, "Entering dccp_attach(proto=%d)!\n", proto)); 1736 INP_INFO_WLOCK(&dccpbinfo); 1737 s = splsoftnet(); 1738 sosetlock(so); 1739 1740 family = so->so_proto->pr_domain->dom_family; 1741 switch (family) { 1742 case PF_INET: 1743 inp = sotoinpcb(so); 1744 if (inp != 0) { 1745 error = EINVAL; 1746 goto out; 1747 } 1748 error = soreserve(so, dccp_sendspace, dccp_recvspace); 1749 if (error) 1750 goto out; 1751 error = in_pcballoc(so, &dccpbtable); 1752 if (error) 1753 goto out; 1754 inp = sotoinpcb(so); 1755 break; 1756 #if defined(INET6) 1757 case PF_INET6: 1758 in6p = sotoin6pcb(so); 1759 if (in6p != 0) { 1760 error = EINVAL; 1761 goto out; 1762 } 1763 error = soreserve(so, dccp_sendspace, dccp_recvspace); 1764 if (error) 1765 goto out; 1766 error = in6_pcballoc(so, &dccpbtable); 1767 if (error) 1768 goto out; 1769 in6p = sotoin6pcb(so); 1770 break; 1771 #endif 1772 default: 1773 error = EAFNOSUPPORT; 1774 goto out; 1775 } 1776 1777 if (inp) 1778 dp = dccp_newdccpcb(PF_INET, (void *)inp); 1779 else if (in6p) 1780 dp = dccp_newdccpcb(PF_INET6, (void *)in6p); 1781 else 1782 dp = NULL; 1783 1784 if (dp == 0) { 1785 int nofd = so->so_state & SS_NOFDREF; 1786 so->so_state &= ~SS_NOFDREF; 1787 #if defined(INET6) 1788 if (proto == PF_INET6) { 1789 in6_pcbdetach(in6p); 1790 } else 1791 #endif 1792 in_pcbdetach(inp); 1793 so->so_state |= nofd; 1794 error = ENOBUFS; 1795 goto out; 1796 } 1797 1798 #ifdef INET6 1799 if (proto == PF_INET6) { 1800 DCCP_DEBUG((LOG_INFO, "We are a ipv6 socket!!!\n")); 1801 dp->inp_vflag |= INP_IPV6; 1802 } else 1803 #endif 1804 dp->inp_vflag |= INP_IPV4; 1805 dp->inp_ip_ttl = ip_defttl; 1806 1807 dp->state = DCCPS_CLOSED; 1808 out: 1809 splx(s); 1810 INP_INFO_WUNLOCK(&dccpbinfo); 1811 return error; 1812 } 1813 1814 static int 1815 dccp_bind(struct socket *so, struct sockaddr *nam, struct lwp *l) 1816 { 1817 struct inpcb *inp; 1818 int error; 1819 int s; 1820 struct sockaddr_in *sin = (struct sockaddr_in *)nam; 1821 1822 DCCP_DEBUG((LOG_INFO, "Entering dccp_bind!\n")); 1823 INP_INFO_WLOCK(&dccpbinfo); 1824 inp = sotoinpcb(so); 1825 if (inp == 0) { 1826 INP_INFO_WUNLOCK(&dccpbinfo); 1827 return EINVAL; 1828 } 1829 1830 /* Do not bind to multicast addresses! */ 1831 if (sin->sin_family == AF_INET && 1832 IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 1833 INP_INFO_WUNLOCK(&dccpbinfo); 1834 return EAFNOSUPPORT; 1835 } 1836 INP_LOCK(inp); 1837 s = splsoftnet(); 1838 error = in_pcbbind(inp, sin, l); 1839 splx(s); 1840 INP_UNLOCK(inp); 1841 INP_INFO_WUNLOCK(&dccpbinfo); 1842 return error; 1843 } 1844 1845 /* 1846 * Initiates a connection to a server 1847 * Called by the connect system call. 1848 */ 1849 static int 1850 dccp_connect(struct socket *so, struct sockaddr *nam, struct lwp *l) 1851 { 1852 struct inpcb *inp; 1853 struct dccpcb *dp; 1854 int error; 1855 struct sockaddr_in *sin; 1856 char test[2]; 1857 1858 DCCP_DEBUG((LOG_INFO, "Entering dccp_connect!\n")); 1859 1860 INP_INFO_WLOCK(&dccpbinfo); 1861 inp = sotoinpcb(so); 1862 if (inp == 0) { 1863 INP_INFO_WUNLOCK(&dccpbinfo); 1864 return EINVAL; 1865 } 1866 INP_LOCK(inp); 1867 if (inp->inp_faddr.s_addr != INADDR_ANY) { 1868 INP_UNLOCK(inp); 1869 INP_INFO_WUNLOCK(&dccpbinfo); 1870 return EISCONN; 1871 } 1872 1873 dp = (struct dccpcb *)inp->inp_ppcb; 1874 1875 if (dp->state == DCCPS_ESTAB) { 1876 DCCP_DEBUG((LOG_INFO, "Why are we in connect when we already have a established connection?\n")); 1877 } 1878 1879 dp->who = DCCP_CLIENT; 1880 dp->seq_snd = (((u_int64_t)random() << 32) | random()) % 281474976710656LL; 1881 dp->ref_seq.hi = dp->seq_snd >> 24; 1882 dp->ref_seq.lo = (u_int64_t)(dp->seq_snd & 0xffffff); 1883 DCCP_DEBUG((LOG_INFO, "dccp_connect seq_snd %llu\n", dp->seq_snd)); 1884 1885 dccpstat.dccps_connattempt++; 1886 1887 sin = (struct sockaddr_in *)nam; 1888 if (sin->sin_family == AF_INET 1889 && IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) { 1890 error = EAFNOSUPPORT; 1891 goto bad; 1892 } 1893 1894 error = dccp_doconnect(so, nam, l, 0); 1895 1896 if (error != 0) 1897 goto bad; 1898 1899 callout_reset(&dp->retrans_timer, dp->retrans, dccp_retrans_t, dp); 1900 callout_reset(&dp->connect_timer, DCCP_CONNECT_TIMER, dccp_connect_t, dp); 1901 1902 if (dccp_do_feature_nego){ 1903 test[0] = dp->pref_cc; 1904 dccp_add_feature(dp, DCCP_OPT_CHANGE_R, DCCP_FEATURE_CC, test, 1); 1905 } 1906 1907 error = dccp_output(dp, 0); 1908 1909 bad: 1910 INP_UNLOCK(inp); 1911 INP_INFO_WUNLOCK(&dccpbinfo); 1912 return error; 1913 } 1914 1915 static int 1916 dccp_connect2(struct socket *so, struct socket *so2) 1917 { 1918 KASSERT(solocked(so)); 1919 1920 return EOPNOTSUPP; 1921 } 1922 1923 /* 1924 * 1925 * 1926 */ 1927 int 1928 dccp_doconnect(struct socket *so, struct sockaddr *nam, 1929 struct lwp *l, int isipv6) 1930 { 1931 struct inpcb *inp; 1932 #ifdef INET6 1933 struct in6pcb *in6p; 1934 #endif 1935 int error = 0; 1936 1937 DCCP_DEBUG((LOG_INFO, "Entering dccp_doconnect!\n")); 1938 1939 #if defined(INET6) 1940 if (isipv6) { 1941 in6p = sotoin6pcb(so); 1942 inp = 0; 1943 } else 1944 #endif 1945 { 1946 inp = sotoinpcb(so); 1947 in6p = 0; 1948 } 1949 1950 #if !defined(__NetBSD__) || !defined(INET6) 1951 if (inp->inp_lport == 0) { 1952 #else 1953 if (isipv6 ? in6p->in6p_lport == 0 : inp->inp_lport == 0) { 1954 #endif 1955 #ifdef INET6 1956 if (isipv6) { 1957 DCCP_DEBUG((LOG_INFO, "Running in6_pcbbind!\n")); 1958 error = in6_pcbbind(in6p, NULL, l); 1959 } else 1960 #endif /* INET6 */ 1961 { 1962 error = in_pcbbind(inp, NULL, l); 1963 } 1964 if (error) { 1965 DCCP_DEBUG((LOG_INFO, "in_pcbbind=%d\n",error)); 1966 return error; 1967 } 1968 } 1969 1970 #ifdef INET6 1971 if (isipv6) { 1972 error = in6_pcbconnect(in6p, (struct sockaddr_in6 *)nam, l); 1973 DCCP_DEBUG((LOG_INFO, "in6_pcbconnect=%d\n",error)); 1974 } else 1975 #endif 1976 error = in_pcbconnect(inp, (struct sockaddr_in *)nam, l); 1977 if (error) { 1978 DCCP_DEBUG((LOG_INFO, "in_pcbconnect=%d\n",error)); 1979 return error; 1980 } 1981 1982 soisconnecting(so); 1983 return error; 1984 } 1985 1986 /* 1987 * Detaches the DCCP protocol from the socket. 1988 * 1989 */ 1990 int 1991 dccp_detach(struct socket *so) 1992 { 1993 struct inpcb *inp; 1994 struct in6pcb *in6p; 1995 struct dccpcb *dp; 1996 1997 DCCP_DEBUG((LOG_INFO, "Entering dccp_detach!\n")); 1998 #ifdef INET6 1999 if (so->so_proto->pr_domain->dom_family == AF_INET6) { 2000 in6p = sotoin6pcb(so); 2001 if (in6p == 0) { 2002 return EINVAL; 2003 } 2004 dp = (struct dccpcb *)in6p->in6p_ppcb; 2005 } else 2006 #endif 2007 { 2008 inp = sotoinpcb(so); 2009 if (inp == 0) { 2010 return EINVAL; 2011 } 2012 dp = (struct dccpcb *)inp->inp_ppcb; 2013 } 2014 if (! dccp_disconnect2(dp)) { 2015 INP_UNLOCK(inp); 2016 } 2017 INP_INFO_WUNLOCK(&dccpbinfo); 2018 return 0; 2019 } 2020 2021 /* 2022 * 2023 * 2024 */ 2025 int 2026 dccp_disconnect(struct socket *so) 2027 { 2028 struct inpcb *inp; 2029 struct in6pcb *in6p; 2030 struct dccpcb *dp; 2031 2032 DCCP_DEBUG((LOG_INFO, "Entering dccp_disconnect!\n")); 2033 INP_INFO_WLOCK(&dccpbinfo); 2034 #ifndef __NetBSD__ 2035 inp = sotoinpcb(so); 2036 if (inp == 0) { 2037 INP_INFO_WUNLOCK(&dccpbinfo); 2038 return EINVAL; 2039 } 2040 INP_LOCK(inp); 2041 if (inp->inp_faddr.s_addr == INADDR_ANY) { 2042 INP_INFO_WUNLOCK(&dccpbinfo); 2043 INP_UNLOCK(inp); 2044 return ENOTCONN; 2045 } 2046 2047 dp = (struct dccpcb *)inp->inp_ppcb; 2048 #else /* NetBSD */ 2049 #ifdef INET6 2050 if (so->so_proto->pr_domain->dom_family == AF_INET6) { 2051 in6p = sotoin6pcb(so); 2052 if (in6p == 0) { 2053 INP_INFO_WUNLOCK(&dccpbinfo); 2054 return EINVAL; 2055 } 2056 dp = (struct dccpcb *)in6p->in6p_ppcb; 2057 } else 2058 #endif 2059 { 2060 inp = sotoinpcb(so); 2061 if (inp == 0) { 2062 return EINVAL; 2063 } 2064 dp = (struct dccpcb *)inp->inp_ppcb; 2065 } 2066 #endif 2067 if (!dccp_disconnect2(dp)) { 2068 INP_UNLOCK(inp); 2069 } 2070 INP_INFO_WUNLOCK(&dccpbinfo); 2071 return 0; 2072 } 2073 2074 /* 2075 * If we have don't have a established connection 2076 * we can call dccp_close, otherwise we can just 2077 * set SS_ISDISCONNECTED and flush the receive queue. 2078 */ 2079 static int 2080 dccp_disconnect2(struct dccpcb *dp) 2081 { 2082 struct socket *so = dptosocket(dp); 2083 2084 DCCP_DEBUG((LOG_INFO, "Entering dccp_disconnect2!\n")); 2085 2086 if (dp->state < DCCPS_ESTAB) { 2087 dccp_close(dp); 2088 return 1; 2089 } else { 2090 soisdisconnecting(so); 2091 sbflush(&so->so_rcv); 2092 if (dp->state == DCCPS_ESTAB) { 2093 dp->retrans = 100; 2094 callout_reset(&dp->retrans_timer, dp->retrans, 2095 dccp_retrans_t, dp); 2096 callout_reset(&dp->close_timer, DCCP_CLOSE_TIMER, 2097 dccp_close_t, dp); 2098 if (dp->who == DCCP_CLIENT) { 2099 dp->state = DCCPS_CLIENT_CLOSE; 2100 } else { 2101 dp->state = DCCPS_SERVER_CLOSE; 2102 } 2103 dccp_output(dp, 0); 2104 } 2105 } 2106 return 0; 2107 } 2108 2109 int 2110 dccp_send(struct socket *so, struct mbuf *m, struct sockaddr *addr, 2111 struct mbuf *control, struct lwp *l) 2112 { 2113 struct inpcb *inp; 2114 struct dccpcb *dp; 2115 int error = 0; 2116 int isipv6 = 0; 2117 2118 DCCP_DEBUG((LOG_INFO, "Entering dccp_send!\n")); 2119 KASSERT(solocked(so)); 2120 KASSERT(m != NULL); 2121 2122 if (control && control->m_len) { 2123 m_freem(control); 2124 m_freem(m); 2125 return EINVAL; 2126 } 2127 2128 #ifdef INET6 2129 isipv6 = addr && addr->sa_family == AF_INET6; 2130 #endif 2131 2132 #if defined(INET6) 2133 if (so->so_proto->pr_domain->dom_family == AF_INET6) { 2134 struct in6pcb *in6p; 2135 in6p = sotoin6pcb(so); 2136 if (in6p == 0) { 2137 error = EINVAL; 2138 goto release; 2139 } 2140 dp = (struct dccpcb *)in6p->in6p_ppcb; 2141 } else 2142 #endif 2143 { 2144 INP_INFO_WLOCK(&dccpbinfo); 2145 inp = sotoinpcb(so); 2146 if (inp == 0) { 2147 error = EINVAL; 2148 goto release; 2149 } 2150 INP_LOCK(inp); 2151 dp = (struct dccpcb *)inp->inp_ppcb; 2152 } 2153 if (dp->state != DCCPS_ESTAB) { 2154 DCCP_DEBUG((LOG_INFO, "We have no established connection!\n")); 2155 } 2156 2157 if (control != NULL) { 2158 DCCP_DEBUG((LOG_INFO, "We got a control message!\n")); 2159 /* Are we going to use control messages??? */ 2160 if (control->m_len) { 2161 m_freem(control); 2162 } 2163 } 2164 2165 if (sbspace(&so->so_snd) < -512) { 2166 INP_UNLOCK(inp); 2167 error = ENOBUFS; 2168 goto release; 2169 } 2170 2171 if (m->m_pkthdr.len > dp->d_maxseg) { 2172 /* XXX we should calculate packet size more carefully */ 2173 INP_UNLOCK(inp); 2174 error = EINVAL; 2175 goto release; 2176 } 2177 2178 if (dp->pktcnt >= DCCP_MAX_PKTS) { 2179 INP_UNLOCK(inp); 2180 error = ENOBUFS; 2181 goto release; 2182 } 2183 2184 sbappend(&so->so_snd, m); 2185 dp->pktlen[(dp->pktlenidx + dp->pktcnt) % DCCP_MAX_PKTS] = m->m_pkthdr.len; 2186 dp->pktcnt ++; 2187 2188 if (addr && dp->state == DCCPS_CLOSED) { 2189 error = dccp_doconnect(so, addr, l, isipv6); 2190 if (error) 2191 goto out; 2192 } 2193 2194 error = dccp_output(dp, 0); 2195 2196 out: 2197 INP_UNLOCK(inp); 2198 INP_INFO_WUNLOCK(&dccpbinfo); 2199 return error; 2200 2201 release: 2202 INP_INFO_WUNLOCK(&dccpbinfo); 2203 m_freem(m); 2204 return (error); 2205 } 2206 2207 /* 2208 * Sets socket to SS_CANTSENDMORE 2209 */ 2210 int 2211 dccp_shutdown(struct socket *so) 2212 { 2213 struct inpcb *inp; 2214 2215 DCCP_DEBUG((LOG_INFO, "Entering dccp_shutdown!\n")); 2216 INP_INFO_RLOCK(&dccpbinfo); 2217 inp = sotoinpcb(so); 2218 if (inp == 0) { 2219 INP_INFO_RUNLOCK(&dccpbinfo); 2220 return EINVAL; 2221 } 2222 INP_LOCK(inp); 2223 INP_INFO_RUNLOCK(&dccpbinfo); 2224 socantsendmore(so); 2225 INP_UNLOCK(inp); 2226 return 0; 2227 } 2228 2229 static int 2230 dccp_listen(struct socket *so, struct lwp *td) 2231 { 2232 struct inpcb *inp; 2233 struct dccpcb *dp; 2234 int error = 0; 2235 2236 DCCP_DEBUG((LOG_INFO, "Entering dccp_listen!\n")); 2237 2238 INP_INFO_RLOCK(&dccpbinfo); 2239 inp = sotoinpcb(so); 2240 if (inp == 0) { 2241 INP_INFO_RUNLOCK(&dccpbinfo); 2242 return EINVAL; 2243 } 2244 INP_LOCK(inp); 2245 INP_INFO_RUNLOCK(&dccpbinfo); 2246 dp = (struct dccpcb *)inp->inp_ppcb; 2247 if (inp->inp_lport == 0) 2248 error = in_pcbbind(inp, NULL, td); 2249 if (error == 0) { 2250 dp->state = DCCPS_LISTEN; 2251 dp->who = DCCP_LISTENER; 2252 } 2253 INP_UNLOCK(inp); 2254 return error; 2255 } 2256 2257 /* 2258 * Accepts a connection (accept system call) 2259 */ 2260 static int 2261 dccp_accept(struct socket *so, struct sockaddr *nam) 2262 { 2263 struct inpcb *inp = NULL; 2264 int error = 0; 2265 2266 DCCP_DEBUG((LOG_INFO, "Entering dccp_accept!\n")); 2267 2268 if (nam == NULL) { 2269 return EINVAL; 2270 } 2271 if (so->so_state & SS_ISDISCONNECTED) { 2272 DCCP_DEBUG((LOG_INFO, "so_state && SS_ISDISCONNECTED!, so->state = %i\n", so->so_state)); 2273 return ECONNABORTED; 2274 } 2275 2276 INP_INFO_RLOCK(&dccpbinfo); 2277 inp = sotoinpcb(so); 2278 if (inp == 0) { 2279 INP_INFO_RUNLOCK(&dccpbinfo); 2280 return EINVAL; 2281 } 2282 INP_LOCK(inp); 2283 INP_INFO_RUNLOCK(&dccpbinfo); 2284 in_setpeeraddr(inp, (struct sockaddr_in *)nam); 2285 2286 return error; 2287 } 2288 2289 /* 2290 * Initializes a new DCCP control block 2291 * (in_pcballoc in attach has already allocated memory for it) 2292 */ 2293 struct dccpcb * 2294 dccp_newdccpcb(int family, void *aux) 2295 { 2296 struct inpcb *inp; 2297 struct in6pcb *in6p; 2298 struct dccpcb *dp; 2299 2300 DCCP_DEBUG((LOG_INFO, "Creating a new dccpcb!\n")); 2301 2302 dp = pool_get(&dccpcb_pool, PR_NOWAIT); 2303 if (dp == NULL) 2304 return NULL; 2305 memset((char *) dp, 0, sizeof(struct dccpcb)); 2306 2307 callout_init(&dp->connect_timer, 0); 2308 callout_init(&dp->retrans_timer, 0); 2309 callout_init(&dp->close_timer, 0); 2310 callout_init(&dp->timewait_timer, 0); 2311 2312 dp->ndp = 0; 2313 dp->loss_window = 1000; 2314 dp->cslen = 0; 2315 dp->pref_cc = DEFAULT_CCID; 2316 dp->who = DCCP_UNDEF; 2317 dp->seq_snd = 0; 2318 dp->seq_rcv = 0; 2319 dp->shortseq = 0; 2320 dp->gsn_rcv = 281474976710656LL; 2321 dp->optlen = 0; 2322 if (dccp_do_feature_nego){ 2323 dp->cc_in_use[0] = -1; 2324 dp->cc_in_use[1] = -1; 2325 } else { 2326 /* for compatibility with linux */ 2327 dp->cc_in_use[0] = 4; 2328 dp->cc_in_use[1] = 4; 2329 } 2330 dp->av_size = 0; /* no ack vector initially */ 2331 dp->remote_ackvector = 0; /* no ack vector on remote side initially */ 2332 dp->retrans = 200; 2333 dp->avgpsize = 0; 2334 dp->d_maxseg = 1400; 2335 dp->ref_pseq.hi = 0; 2336 dp->ref_pseq.lo = 0; 2337 dp->pktlenidx = 0; 2338 dp->pktcnt = 0; 2339 2340 switch (family) { 2341 case PF_INET: 2342 inp = (struct inpcb *)aux; 2343 dp->d_inpcb = inp; 2344 inp->inp_ip.ip_ttl = ip_defttl; 2345 inp->inp_ppcb = dp; 2346 break; 2347 case PF_INET6: 2348 in6p = (struct in6pcb *)aux; 2349 dp->d_in6pcb = in6p; 2350 in6p->in6p_ip6.ip6_hlim = in6_selecthlim_rt(in6p); 2351 in6p->in6p_ppcb = dp; 2352 break; 2353 } 2354 2355 if (!dccp_do_feature_nego){ 2356 dp->cc_state[0] = (*cc_sw[4].cc_send_init)(dp); 2357 dp->cc_state[1] = (*cc_sw[4].cc_recv_init)(dp); 2358 } 2359 2360 return dp; 2361 } 2362 2363 int 2364 dccp_add_option(struct dccpcb *dp, u_int8_t opt, char *val, u_int8_t val_len) 2365 { 2366 return dccp_add_feature_option(dp, opt, 0, val, val_len); 2367 } 2368 2369 int 2370 dccp_add_feature_option(struct dccpcb *dp, u_int8_t opt, u_int8_t feature, char *val, u_int8_t val_len) 2371 { 2372 int i; 2373 DCCP_DEBUG((LOG_INFO, "Entering dccp_add_feature_option, opt = %u, val_len = %u optlen %u\n", opt, val_len, dp->optlen)); 2374 2375 if (DCCP_MAX_OPTIONS > (dp->optlen + val_len + 2)) { 2376 dp->options[dp->optlen] = opt; 2377 if (opt < 32) { 2378 dp->optlen++; 2379 } else { 2380 if (opt == DCCP_OPT_CONFIRM_L && val_len) { 2381 dp->options[dp->optlen + 1] = val_len + 3; 2382 dp->options[dp->optlen +2] = feature; 2383 dp->optlen += 3; 2384 } else { 2385 dp->options[dp->optlen + 1] = val_len + 2; 2386 dp->optlen += 2; 2387 } 2388 2389 for (i = 0; i<val_len; i++) { 2390 dp->options[dp->optlen] = val[i]; 2391 dp->optlen++; 2392 } 2393 } 2394 } else { 2395 DCCP_DEBUG((LOG_INFO, "No room for more options, optlen = %u\n", dp->optlen)); 2396 return -1; 2397 } 2398 2399 return 0; 2400 } 2401 2402 /* 2403 * Searches "options" for given option type. if found, the data is copied to buffer 2404 * and returns the data length. 2405 * Returns 0 if option type not found 2406 */ 2407 int 2408 dccp_get_option(char *options, int optlen, int type, char *buffer, int buflen) 2409 { 2410 int i, j, size; 2411 u_int8_t t; 2412 2413 for (i=0; i < optlen;) { 2414 t = options[i++]; 2415 if (t >= 32) { 2416 size = options[i++] - 2; 2417 if (t == type) { 2418 if (size > buflen) 2419 return 0; 2420 for (j = 0; j < size; j++) 2421 buffer[j] = options[i++]; 2422 return size; 2423 } 2424 i += size; 2425 } 2426 } 2427 /* If we get here the options was not found */ 2428 DCCP_DEBUG((LOG_INFO, "dccp_get_option option(%d) not found\n", type)); 2429 return 0; 2430 } 2431 2432 void 2433 dccp_parse_options(struct dccpcb *dp, char *options, int optlen) 2434 { 2435 u_int8_t opt, size, i, j; 2436 char val[8]; 2437 2438 for (i = 0; i < optlen; i++) { 2439 opt = options[i]; 2440 2441 DCCP_DEBUG((LOG_INFO, "Parsing opt: 0x%02x\n", opt)); 2442 2443 if (opt < 32) { 2444 switch (opt) { 2445 case DCCP_OPT_PADDING: 2446 DCCP_DEBUG((LOG_INFO, "Got DCCP_OPT_PADDING!\n")); 2447 break; 2448 case DCCP_OPT_DATA_DISCARD: 2449 DCCP_DEBUG((LOG_INFO, "Got DCCP_OPT_DATA_DISCARD!\n")); 2450 break; 2451 case DCCP_OPT_SLOW_RECV: 2452 DCCP_DEBUG((LOG_INFO, "Got DCCP_OPT_SLOW_RECV!\n")); 2453 break; 2454 case DCCP_OPT_BUF_CLOSED: 2455 DCCP_DEBUG((LOG_INFO, "Got DCCP_OPT_BUF_CLOSED!\n")); 2456 break; 2457 default: 2458 DCCP_DEBUG((LOG_INFO, "Got an unknown option, option = %u!\n", opt)); 2459 } 2460 } else if (opt > 32 && opt < 36) { 2461 size = options[i+ 1]; 2462 if (size < 3 || size > 10) { 2463 DCCP_DEBUG((LOG_INFO, "Error, option size = %u\n", size)); 2464 return; 2465 } 2466 /* Feature negotiations are options 33 to 35 */ 2467 DCCP_DEBUG((LOG_INFO, "Got option %u, size = %u, feature = %u\n", opt, size, options[i+2])); 2468 memcpy(val, options + i + 3, size -3); 2469 DCCP_DEBUG((LOG_INFO, "Calling dccp_feature neg(%u, %u, options[%u + 1], %u)!\n", (u_int)dp, opt, i+ 1, (size - 3))); 2470 dccp_feature_neg(dp, opt, options[i+2], (size -3) , val); 2471 i += size - 1; 2472 2473 } else if (opt < 128) { 2474 size = options[i+ 1]; 2475 if (size < 3 || size > 10) { 2476 DCCP_DEBUG((LOG_INFO, "Error, option size = %u\n", size)); 2477 return; 2478 } 2479 2480 switch (opt) { 2481 case DCCP_OPT_RECV_BUF_DROPS: 2482 DCCP_DEBUG((LOG_INFO, "Got DCCP_OPT_RECV_BUF_DROPS, size = %u!\n", size)); 2483 for (j=2; j < size; j++) { 2484 DCCP_DEBUG((LOG_INFO, "val[%u] = %u ", j-1, options[i+j])); 2485 } 2486 DCCP_DEBUG((LOG_INFO, "\n")); 2487 break; 2488 2489 case DCCP_OPT_TIMESTAMP: 2490 DCCP_DEBUG((LOG_INFO, "Got DCCP_OPT_TIMESTAMP, size = %u\n", size)); 2491 2492 /* Adding TimestampEcho to next outgoing */ 2493 memcpy(val, options + i + 2, 4); 2494 memset(val + 4, 0, 4); 2495 dccp_add_option(dp, DCCP_OPT_TIMESTAMP_ECHO, val, 8); 2496 break; 2497 2498 case DCCP_OPT_TIMESTAMP_ECHO: 2499 DCCP_DEBUG((LOG_INFO, "Got DCCP_OPT_TIMESTAMP_ECHO, size = %u\n",size)); 2500 for (j=2; j < size; j++) { 2501 DCCP_DEBUG((LOG_INFO, "val[%u] = %u ", j-1, options[i+j])); 2502 } 2503 DCCP_DEBUG((LOG_INFO, "\n")); 2504 2505 /* 2506 memcpy(&(dp->timestamp_echo), options + i + 2, 4); 2507 memcpy(&(dp->timestamp_elapsed), options + i + 6, 4); 2508 ACK_DEBUG((LOG_INFO, "DATA; echo = %u , elapsed = %u\n", 2509 dp->timestamp_echo, dp->timestamp_elapsed)); 2510 */ 2511 2512 break; 2513 2514 case DCCP_OPT_ACK_VECTOR0: 2515 case DCCP_OPT_ACK_VECTOR1: 2516 case DCCP_OPT_ELAPSEDTIME: 2517 /* Dont do nothing here. Let the CC deal with it */ 2518 break; 2519 2520 default: 2521 DCCP_DEBUG((LOG_INFO, "Got an unknown option, option = %u, size = %u!\n", opt, size)); 2522 break; 2523 2524 } 2525 i += size - 1; 2526 2527 } else { 2528 DCCP_DEBUG((LOG_INFO, "Got a CCID option (%d), do nothing!\n", opt)); 2529 size = options[i+ 1]; 2530 if (size < 3 || size > 10) { 2531 DCCP_DEBUG((LOG_INFO, "Error, option size = %u\n", size)); 2532 return; 2533 } 2534 i += size - 1; 2535 } 2536 } 2537 2538 } 2539 2540 int 2541 dccp_add_feature(struct dccpcb *dp, u_int8_t opt, u_int8_t feature, char *val, u_int8_t val_len) 2542 { 2543 int i; 2544 DCCP_DEBUG((LOG_INFO, "Entering dccp_add_feature, opt = %u, feature = %u, val_len = %u\n", opt, feature, val_len)); 2545 2546 if (DCCP_MAX_OPTIONS > (dp->featlen + val_len + 3)) { 2547 dp->features[dp->featlen] = opt; 2548 dp->features[dp->featlen + 1] = val_len + 3; 2549 dp->features[dp->featlen +2] = feature; 2550 dp->featlen += 3; 2551 for (i = 0; i<val_len; i++) { 2552 dp->features[dp->featlen] = val[i]; 2553 dp->featlen++; 2554 } 2555 } else { 2556 DCCP_DEBUG((LOG_INFO, "No room for more features, featlen = %u\n", dp->featlen)); 2557 return -1; 2558 } 2559 2560 return 0; 2561 } 2562 2563 int 2564 dccp_remove_feature(struct dccpcb *dp, u_int8_t opt, u_int8_t feature) 2565 { 2566 int i = 0, j = 0, k; 2567 u_int8_t t_opt, t_feature, len; 2568 DCCP_DEBUG((LOG_INFO, "Entering dccp_remove_feature, featlen = %u, opt = %u, feature = %u\n", dp->featlen, opt, feature)); 2569 2570 while (i < dp->featlen) { 2571 t_opt = dp->features[i]; 2572 len = dp->features[i+ 1]; 2573 2574 if (i + len > dp->featlen) { 2575 DCCP_DEBUG((LOG_INFO, "Error, len = %u and i(%u) + len > dp->featlen (%u)\n", len, i, dp->featlen)); 2576 return 1; 2577 } 2578 t_feature = dp->features[i+2]; 2579 2580 if (t_opt == opt && t_feature == feature) { 2581 i += len; 2582 } else { 2583 if (i != j) { 2584 for (k = 0; k < len; k++) { 2585 dp->features[j+k] = dp->features[i+k]; 2586 } 2587 } 2588 i += len; 2589 j += len; 2590 } 2591 } 2592 dp->featlen = j; 2593 DCCP_DEBUG((LOG_INFO, "Exiting dccp_remove_feature, featlen = %u\n", dp->featlen)); 2594 return 0; 2595 } 2596 2597 void 2598 dccp_feature_neg(struct dccpcb *dp, u_int8_t opt, u_int8_t feature, u_int8_t val_len, char *val) 2599 { 2600 DCCP_DEBUG((LOG_INFO, "Running dccp_feature_neg, opt = %u, feature = %u len = %u ", opt, feature, val_len)); 2601 2602 switch (feature) { 2603 case DCCP_FEATURE_CC: 2604 DCCP_DEBUG((LOG_INFO, "Got CCID negotiation, opt = %u, val[0] = %u\n", opt, val[0])); 2605 if (opt == DCCP_OPT_CHANGE_R) { 2606 if (val[0] == 2 || val[0] == 3 || val[0] == 0) { 2607 /* try to use preferable CCID */ 2608 int i; 2609 for (i = 1; i < val_len; i ++) if (val[i] == dp->pref_cc) val[0] = dp->pref_cc; 2610 DCCP_DEBUG((LOG_INFO, "Sending DCCP_OPT_CONFIRM_L on CCID %u\n", val[0])); 2611 dccp_remove_feature(dp, DCCP_OPT_CONFIRM_L, DCCP_FEATURE_CC); 2612 dccp_add_feature_option(dp, DCCP_OPT_CONFIRM_L, DCCP_FEATURE_CC , val, 1); 2613 if (dp->cc_in_use[0] < 1) { 2614 dp->cc_state[0] = (*cc_sw[val[0] + 1].cc_send_init)(dp); 2615 dp->cc_in_use[0] = val[0] + 1; 2616 } else { 2617 DCCP_DEBUG((LOG_INFO, "We already have negotiated a CC!!!\n")); 2618 } 2619 } 2620 } else if (opt == DCCP_OPT_CONFIRM_L) { 2621 DCCP_DEBUG((LOG_INFO, "Got DCCP_OPT_CONFIRM_L on CCID %u\n", val[0])); 2622 dccp_remove_feature(dp, DCCP_OPT_CHANGE_R, DCCP_FEATURE_CC); 2623 if (dp->cc_in_use[1] < 1) { 2624 dp->cc_state[1] = (*cc_sw[val[0] + 1].cc_recv_init)(dp); 2625 dp->cc_in_use[1] = val[0] + 1; 2626 DCCP_DEBUG((LOG_INFO, "confirmed cc_in_use[1] = %d\n", dp->cc_in_use[1])); 2627 } else { 2628 DCCP_DEBUG((LOG_INFO, "We already have negotiated a CC!!! (confirm) %d\n", dp->cc_in_use[1])); 2629 } 2630 } 2631 2632 break; 2633 2634 case DCCP_FEATURE_ACKVECTOR: 2635 ACK_DEBUG((LOG_INFO, "Got _Use Ack Vector_\n")); 2636 if (opt == DCCP_OPT_CHANGE_R) { 2637 if (val[0] == 1) { 2638 dccp_use_ackvector(dp); 2639 dccp_remove_feature(dp, DCCP_OPT_CONFIRM_L, DCCP_FEATURE_ACKVECTOR); 2640 dccp_add_feature_option(dp, DCCP_OPT_CONFIRM_L, DCCP_FEATURE_ACKVECTOR , val, 1); 2641 } else { 2642 ACK_DEBUG((LOG_INFO, "ERROR. Strange val %u\n", val[0])); 2643 } 2644 } else if (opt == DCCP_OPT_CONFIRM_L) { 2645 dccp_remove_feature(dp, DCCP_OPT_CONFIRM_L, DCCP_FEATURE_ACKVECTOR); 2646 if (val[0] == 1) { 2647 dp->remote_ackvector = 1; 2648 ACK_DEBUG((LOG_INFO,"Remote side confirmed AckVector usage\n")); 2649 } else { 2650 ACK_DEBUG((LOG_INFO, "ERROR. Strange val %u\n", val[0])); 2651 } 2652 } 2653 break; 2654 2655 case DCCP_FEATURE_ACKRATIO: 2656 if (opt == DCCP_OPT_CHANGE_R) { 2657 memcpy(&(dp->ack_ratio), val, 1); 2658 ACK_DEBUG((LOG_INFO, "Feature: Change Ack Ratio to %u\n", dp->ack_ratio)); 2659 } 2660 break; 2661 2662 case DCCP_FEATURE_ECN: 2663 case DCCP_FEATURE_MOBILITY: 2664 default: 2665 /* we should send back empty CONFIRM_L for unknown feature unless it's not mandatory */ 2666 dccp_add_option(dp, DCCP_OPT_CONFIRM_L, NULL, 0); 2667 break; 2668 2669 } 2670 } 2671 2672 #ifdef __FreeBSD__ 2673 static int 2674 dccp_pcblist(SYSCTL_HANDLER_ARGS) 2675 { 2676 2677 int error, i, n, s; 2678 struct inpcb *inp, **inp_list; 2679 inp_gen_t gencnt; 2680 struct xinpgen xig; 2681 2682 /* 2683 * The process of preparing the TCB list is too time-consuming and 2684 * resource-intensive to repeat twice on every request. 2685 */ 2686 if (req->oldptr == 0) { 2687 n = dccpbinfo.ipi_count; 2688 req->oldidx = 2 * (sizeof xig) 2689 + (n + n/8) * sizeof(struct xdccpcb); 2690 return 0; 2691 } 2692 2693 2694 if (req->newptr != 0) 2695 return EPERM; 2696 2697 2698 /* 2699 * OK, now we're committed to doing something. 2700 */ 2701 s = splnet(); 2702 gencnt = dccpbinfo.ipi_gencnt; 2703 n = dccpbinfo.ipi_count; 2704 splx(s); 2705 2706 #if __FreeBSD_version >= 500000 2707 sysctl_wire_old_buffer(req, 2 * (sizeof xig) 2708 + n * sizeof(struct xdccpcb)); 2709 #endif 2710 2711 xig.xig_len = sizeof xig; 2712 xig.xig_count = n; 2713 xig.xig_gen = gencnt; 2714 xig.xig_sogen = so_gencnt; 2715 error = SYSCTL_OUT(req, &xig, sizeof xig); 2716 if (error) 2717 return error; 2718 2719 inp_list = malloc(n * sizeof *inp_list, M_TEMP, M_WAITOK); 2720 if (inp_list == 0) 2721 return ENOMEM; 2722 2723 s = splsoftnet(); 2724 INP_INFO_RLOCK(&dccpbinfo); 2725 2726 for (inp = LIST_FIRST(dccpbinfo.listhead), i = 0; inp && i < n; 2727 inp = LIST_NEXT(inp, inp_list)) { 2728 INP_LOCK(inp); 2729 if (inp->inp_gencnt <= gencnt && 2730 #if __FreeBSD_version >= 500000 2731 cr_canseesocket(req->td->td_ucred, inp->inp_socket) == 0) 2732 #else 2733 !prison_xinpcb(req->p, inp)) 2734 #endif 2735 inp_list[i++] = inp; 2736 INP_UNLOCK(inp); 2737 } 2738 INP_INFO_RUNLOCK(&dccpbinfo); 2739 splx(s); 2740 n = i; 2741 2742 error = 0; 2743 for (i = 0; i < n; i++) { 2744 inp = inp_list[i]; 2745 INP_LOCK(inp); 2746 2747 if (inp->inp_gencnt <= gencnt) { 2748 struct xdccpcb xd; 2749 vaddr_t inp_ppcb; 2750 xd.xd_len = sizeof xd; 2751 /* XXX should avoid extra copy */ 2752 memcpy(&xd.xd_inp, inp, sizeof *inp); 2753 inp_ppcb = inp->inp_ppcb; 2754 if (inp_ppcb != NULL) 2755 memcpy(&xd.xd_dp, inp_ppcb, sizeof xd.xd_dp); 2756 else 2757 memset((char *) &xd.xd_dp, 0, sizeof xd.xd_dp); 2758 if (inp->inp_socket) 2759 sotoxsocket(inp->inp_socket, &xd.xd_socket); 2760 error = SYSCTL_OUT(req, &xd, sizeof xd); 2761 } 2762 INP_UNLOCK(inp); 2763 } 2764 if (!error) { 2765 /* 2766 * Give the user an updated idea of our state. 2767 * If the generation differs from what we told 2768 * her before, she knows that something happened 2769 * while we were processing this request, and it 2770 * might be necessary to retry. 2771 */ 2772 s = splnet(); 2773 INP_INFO_RLOCK(&dccpbinfo); 2774 xig.xig_gen = dccpbinfo.ipi_gencnt; 2775 xig.xig_sogen = so_gencnt; 2776 xig.xig_count = dccpbinfo.ipi_count; 2777 2778 2779 INP_INFO_RUNLOCK(&dccpbinfo); 2780 splx(s); 2781 error = SYSCTL_OUT(req, &xig, sizeof xig); 2782 } 2783 free(inp_list, M_TEMP); 2784 return error; 2785 } 2786 #endif 2787 2788 #ifdef __FreeBSD__ 2789 SYSCTL_PROC(_net_inet_dccp, DCCPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0, 2790 dccp_pcblist, "S,xdccpcb", "List of active DCCP sockets"); 2791 #endif 2792 2793 void 2794 dccp_timewait_t(void *dcb) 2795 { 2796 struct dccpcb *dp = dcb; 2797 2798 DCCP_DEBUG((LOG_INFO, "Entering dccp_timewait_t!\n")); 2799 mutex_enter(softnet_lock); 2800 INP_INFO_WLOCK(&dccpbinfo); 2801 INP_LOCK(dp->d_inpcb); 2802 dccp_close(dp); 2803 INP_INFO_WUNLOCK(&dccpbinfo); 2804 mutex_exit(softnet_lock); 2805 } 2806 2807 void 2808 dccp_connect_t(void *dcb) 2809 { 2810 struct dccpcb *dp = dcb; 2811 2812 DCCP_DEBUG((LOG_INFO, "Entering dccp_connect_t!\n")); 2813 mutex_enter(softnet_lock); 2814 INP_INFO_WLOCK(&dccpbinfo); 2815 INP_LOCK(dp->d_inpcb); 2816 dccp_close(dp); 2817 INP_INFO_WUNLOCK(&dccpbinfo); 2818 mutex_exit(softnet_lock); 2819 } 2820 2821 void 2822 dccp_close_t(void *dcb) 2823 { 2824 struct dccpcb *dp = dcb; 2825 2826 DCCP_DEBUG((LOG_INFO, "Entering dccp_close_t!\n")); 2827 mutex_enter(softnet_lock); 2828 INP_INFO_WLOCK(&dccpbinfo); 2829 dp->state = DCCPS_TIME_WAIT; /* HMM */ 2830 if (dp->who == DCCP_SERVER) { 2831 INP_LOCK(dp->d_inpcb); 2832 KERNEL_LOCK(1, NULL); 2833 dccp_output(dp, DCCP_TYPE_RESET + 2); 2834 KERNEL_UNLOCK_ONE(NULL); 2835 dccp_close(dp); 2836 } else { 2837 INP_LOCK(dp->d_inpcb); 2838 dccp_output(dp, DCCP_TYPE_RESET + 2); 2839 /*dp->state = DCCPS_TIME_WAIT; */ 2840 callout_reset(&dp->timewait_timer, DCCP_TIMEWAIT_TIMER, 2841 dccp_timewait_t, dp); 2842 INP_UNLOCK(dp->d_inpcb); 2843 } 2844 INP_INFO_WUNLOCK(&dccpbinfo); 2845 mutex_exit(softnet_lock); 2846 } 2847 2848 void 2849 dccp_retrans_t(void *dcb) 2850 { 2851 struct dccpcb *dp = dcb; 2852 /*struct inpcb *inp;*/ 2853 2854 DCCP_DEBUG((LOG_INFO, "Entering dccp_retrans_t!\n")); 2855 mutex_enter(softnet_lock); 2856 INP_INFO_RLOCK(&dccpbinfo); 2857 /*inp = dp->d_inpcb;*/ 2858 INP_LOCK(inp); 2859 INP_INFO_RUNLOCK(&dccpbinfo); 2860 callout_stop(&dp->retrans_timer); 2861 KERNEL_LOCK(1, NULL); 2862 dccp_output(dp, 0); 2863 KERNEL_UNLOCK_ONE(NULL); 2864 dp->retrans = dp->retrans * 2; 2865 callout_reset(&dp->retrans_timer, dp->retrans, dccp_retrans_t, dp); 2866 INP_UNLOCK(inp); 2867 mutex_exit(softnet_lock); 2868 } 2869 2870 static int 2871 dccp_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp) 2872 { 2873 int error = 0; 2874 int family; 2875 2876 family = so->so_proto->pr_domain->dom_family; 2877 switch (family) { 2878 case PF_INET: 2879 error = in_control(so, cmd, nam, ifp); 2880 break; 2881 #ifdef INET6 2882 case PF_INET6: 2883 error = in6_control(so, cmd, nam, ifp); 2884 break; 2885 #endif 2886 default: 2887 error = EAFNOSUPPORT; 2888 } 2889 return (error); 2890 } 2891 2892 static int 2893 dccp_stat(struct socket *so, struct stat *ub) 2894 { 2895 return 0; 2896 } 2897 2898 static int 2899 dccp_peeraddr(struct socket *so, struct sockaddr *nam) 2900 { 2901 2902 KASSERT(solocked(so)); 2903 KASSERT(sotoinpcb(so) != NULL); 2904 KASSERT(nam != NULL); 2905 2906 in_setpeeraddr(sotoinpcb(so), (struct sockaddr_in *)nam); 2907 return 0; 2908 } 2909 2910 static int 2911 dccp_sockaddr(struct socket *so, struct sockaddr *nam) 2912 { 2913 2914 KASSERT(solocked(so)); 2915 KASSERT(sotoinpcb(so) != NULL); 2916 KASSERT(nam != NULL); 2917 2918 in_setsockaddr(sotoinpcb(so), (struct sockaddr_in *)nam); 2919 return 0; 2920 } 2921 2922 static int 2923 dccp_rcvd(struct socket *so, int flags, struct lwp *l) 2924 { 2925 KASSERT(solocked(so)); 2926 2927 return EOPNOTSUPP; 2928 } 2929 2930 static int 2931 dccp_recvoob(struct socket *so, struct mbuf *m, int flags) 2932 { 2933 KASSERT(solocked(so)); 2934 2935 return EOPNOTSUPP; 2936 } 2937 2938 static int 2939 dccp_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control) 2940 { 2941 KASSERT(solocked(so)); 2942 2943 m_freem(m); 2944 m_freem(control); 2945 2946 return EOPNOTSUPP; 2947 } 2948 2949 static int 2950 dccp_purgeif(struct socket *so, struct ifnet *ifp) 2951 { 2952 int s; 2953 2954 s = splsoftnet(); 2955 mutex_enter(softnet_lock); 2956 in_pcbpurgeif0(&dccpbtable, ifp); 2957 in_purgeif(ifp); 2958 in_pcbpurgeif(&dccpbtable, ifp); 2959 mutex_exit(softnet_lock); 2960 splx(s); 2961 2962 return 0; 2963 } 2964 2965 /****** Ack Vector functions *********/ 2966 2967 /** 2968 * Initialize and allocate mem for Ack Vector 2969 **/ 2970 void 2971 dccp_use_ackvector(struct dccpcb *dp) 2972 { 2973 DCCP_DEBUG((LOG_INFO,"Initializing AckVector\n")); 2974 if (dp->ackvector != 0) { 2975 DCCP_DEBUG((LOG_INFO, "It was already initialized!!!\n")); 2976 return; 2977 } 2978 dp->av_size = DCCP_VECTORSIZE; 2979 /* need 2 bits per entry */ 2980 dp->ackvector = malloc(dp->av_size/4, M_PCB, M_NOWAIT | M_ZERO); 2981 if (dp->ackvector == 0) { 2982 DCCP_DEBUG((LOG_INFO, "Unable to allocate memory for ackvector\n")); 2983 /* What to do now? */ 2984 dp->av_size = 0; 2985 return; 2986 } 2987 memset(dp->ackvector, 0xff, dp->av_size/4); 2988 dp->av_hs = dp->av_ts = 0; 2989 dp->av_hp = dp->ackvector; 2990 } 2991 2992 /** 2993 * Set 'seqnr' as the new head in ackvector 2994 **/ 2995 void 2996 dccp_update_ackvector(struct dccpcb *dp, u_int64_t seqnr) 2997 { 2998 int64_t gap; 2999 u_char *t; 3000 3001 /* Ignore wrapping for now */ 3002 3003 ACK_DEBUG((LOG_INFO,"New head in ackvector: %u\n", seqnr)); 3004 3005 if (dp->av_size == 0) { 3006 ACK_DEBUG((LOG_INFO, "Update: AckVector NOT YET INITIALIZED!!!\n")); 3007 dccp_use_ackvector(dp); 3008 } 3009 3010 if (seqnr > dp->av_hs) { 3011 gap = seqnr - dp->av_hs; 3012 } else { 3013 /* We received obsolete information */ 3014 return; 3015 } 3016 3017 t = dp->av_hp + (gap/4); 3018 if (t >= (dp->ackvector + (dp->av_size/4))) 3019 t -= (dp->av_size / 4); /* ackvector wrapped */ 3020 dp->av_hp = t; 3021 dp->av_hs = seqnr; 3022 } 3023 3024 /** 3025 * We've received a packet. store in local av so it's included in 3026 * next Ack Vector sent 3027 **/ 3028 void 3029 dccp_increment_ackvector(struct dccpcb *dp, u_int64_t seqnr) 3030 { 3031 u_int64_t offset, dc; 3032 int64_t gap; 3033 u_char *t, *n; 3034 3035 DCCP_DEBUG((LOG_INFO, "Entering dccp_increment_ackvecktor %d\n", dp->av_size)); 3036 if (dp->av_size == 0) { 3037 DCCP_DEBUG((LOG_INFO, "Increment: AckVector NOT YET INITIALIZED!!!\n")); 3038 dccp_use_ackvector(dp); 3039 } 3040 3041 if (dp->av_hs == dp->av_ts) { 3042 /* Empty ack vector */ 3043 dp->av_hs = dp->av_ts = seqnr; 3044 } 3045 3046 /* Check for wrapping */ 3047 if (seqnr >= dp->av_hs) { 3048 /* Not wrapped */ 3049 gap = seqnr - dp->av_hs; 3050 } else { 3051 /* Wrapped */ 3052 gap = seqnr + 0x1000000000000LL - dp->av_hs; /* seqnr = 48 bits */ 3053 } 3054 DCCP_DEBUG((LOG_INFO, "dccp_increment_ackvecktor gap=%llu av_size %d\n", gap, dp->av_size)); 3055 3056 if (gap >= dp->av_size) { 3057 /* gap is bigger than ackvector size? baaad */ 3058 /* maybe we should increase the ackvector here */ 3059 DCCP_DEBUG((LOG_INFO, "increment_ackvector error. gap: %llu, av_size: %d, seqnr: %d\n", 3060 gap, dp->av_size, seqnr)); 3061 return; 3062 } 3063 3064 offset = gap % 4; /* hi or low 2 bits to mark */ 3065 t = dp->av_hp + (gap/4); 3066 if (t >= (dp->ackvector + (dp->av_size/4))) 3067 t -= (dp->av_size / 4); /* ackvector wrapped */ 3068 3069 *t = *t & (~(0x03 << (offset *2))); /* turn off bits, 00 is rcvd, 11 is missing */ 3070 3071 dp->av_ts = seqnr + 1; 3072 if (dp->av_ts == 0x1000000000000LL) 3073 dp->av_ts = 0; 3074 3075 if (gap > (dp->av_size - 128)) { 3076 n = malloc(dp->av_size/2, M_PCB, M_NOWAIT | M_ZERO); /* old size * 2 */ 3077 memset (n + dp->av_size / 4, 0xff, dp->av_size / 4); /* new half all missing */ 3078 dc = (dp->ackvector + (dp->av_size/4)) - dp->av_hp; 3079 memcpy (n, dp->av_hp, dc); /* tail to end */ 3080 memcpy (n+dc, dp->ackvector, dp->av_hp - dp->ackvector); /* start to tail */ 3081 dp->av_size = dp->av_size * 2; /* counted in items, so it';s a doubling */ 3082 free (dp->ackvector, M_PCB); 3083 dp->av_hp = dp->ackvector = n; 3084 } 3085 } 3086 3087 /** 3088 * Generates the ack vector to send in outgoing packet. 3089 * These are backwards (first packet in ack vector is packet indicated by Ack Number, 3090 * subsequent are older packets). 3091 **/ 3092 3093 u_int16_t 3094 dccp_generate_ackvector(struct dccpcb *dp, u_char *buf) 3095 { 3096 int64_t j; 3097 u_int64_t i; 3098 u_int16_t cnt, oldlen, bufsize; 3099 u_char oldstate, st; 3100 3101 bufsize = 16; 3102 cnt = 0; 3103 3104 oldstate = 0x04; /* bad value */ 3105 oldlen = 0; 3106 3107 if (dp->av_size == 0) { 3108 ACK_DEBUG((LOG_INFO, "Generate: AckVector NOT YET INITIALIZED!!!\n")); 3109 return 0; 3110 } 3111 3112 if (dp->seq_rcv > dp->av_ts) { 3113 /* AckNum is beyond our av-list , so we'll start with some 3114 * 0x3 (Packet not yet received) */ 3115 j = dp->seq_rcv - dp->av_ts -1; 3116 do { 3117 /* state | length */ 3118 oldstate = 0x03; 3119 if (j > 63) 3120 oldlen = 63; 3121 else 3122 oldlen = j; 3123 3124 buf[cnt] = (0x03 << 6) | oldlen; 3125 cnt++; 3126 if (cnt == bufsize) { 3127 /* I've skipped the realloc bshit */ 3128 /* PANIC */ 3129 } 3130 j-=63; 3131 } while (j > 0); 3132 } 3133 3134 /* Ok now we're at dp->av_ts (unless AckNum is lower) */ 3135 i = (dp->seq_rcv < dp->av_ts) ? dp->seq_rcv : dp->av_ts; 3136 st = dccp_ackvector_state(dp, i); 3137 3138 if (st == oldstate) { 3139 cnt--; 3140 oldlen++; 3141 } else { 3142 oldlen = 0; 3143 oldstate = st; 3144 } 3145 3146 if (dp->av_ts > dp->av_hs) { 3147 do { 3148 i--; 3149 st = dccp_ackvector_state(dp, i); 3150 if (st == oldstate && oldlen < 64) { 3151 oldlen++; 3152 } else { 3153 buf[cnt] = (oldstate << 6) | (oldlen & 0x3f); 3154 cnt++; 3155 oldlen = 0; 3156 oldstate = st; 3157 if (cnt == bufsize) { 3158 /* PANIC */ 3159 } 3160 } 3161 3162 } while (i > dp->av_hs); 3163 } else { 3164 /* It's wrapped */ 3165 do { 3166 i--; 3167 st = dccp_ackvector_state(dp, i); 3168 if (st == oldstate && oldlen < 64) { 3169 oldlen++; 3170 } else { 3171 buf[cnt] = (oldstate << 6) | (oldlen & 0x3f); 3172 cnt++; 3173 oldlen = 0; 3174 oldstate = st; 3175 if (cnt == bufsize) { 3176 /* PANIC */ 3177 } 3178 } 3179 3180 } while (i > 0); 3181 i = 0x1000000; 3182 do { 3183 i--; 3184 st = dccp_ackvector_state(dp, i); 3185 if (st == oldstate && oldlen < 64) { 3186 oldlen++; 3187 } else { 3188 buf[cnt] = (oldstate << 6) | (oldlen & 0x3f); 3189 cnt++; 3190 oldlen = 0; 3191 oldstate = st; 3192 if (cnt == bufsize) { 3193 /* PANIC */ 3194 } 3195 } 3196 } while (i > dp->av_hs); 3197 } 3198 3199 /* add the last one */ 3200 buf[cnt] = (oldstate << 6) | (oldlen & 0x3f); 3201 cnt++; 3202 3203 return cnt; 3204 } 3205 3206 u_char 3207 dccp_ackvector_state(struct dccpcb *dp, u_int64_t seqnr) 3208 { 3209 u_int64_t gap, offset; 3210 u_char *t; 3211 3212 /* Check for wrapping */ 3213 if (seqnr >= dp->av_hs) { 3214 /* Not wrapped */ 3215 gap = seqnr - dp->av_hs; 3216 } else { 3217 /* Wrapped */ 3218 gap = seqnr + 0x1000000000000LL - dp->av_hs; /* seq nr = 48 bits */ 3219 } 3220 3221 if (gap >= dp->av_size) { 3222 /* gap is bigger than ackvector size? baaad */ 3223 return 0x03; 3224 } 3225 3226 offset = gap % 4 *2; 3227 t = dp->av_hp + (gap/4); 3228 if (t >= (dp->ackvector + (dp->av_size/4))) 3229 t -= (dp->av_size / 4); /* wrapped */ 3230 3231 return ((*t & (0x03 << offset)) >> offset); 3232 } 3233 3234 /****** End of Ack Vector functions *********/ 3235 3236 /* No cc functions */ 3237 void * 3238 dccp_nocc_init(struct dccpcb *pcb) 3239 { 3240 return (void*) 1; 3241 } 3242 3243 void 3244 dccp_nocc_free(void *ccb) 3245 { 3246 } 3247 3248 int 3249 dccp_nocc_send_packet(void *ccb, long size) 3250 { 3251 return 1; 3252 } 3253 3254 void 3255 dccp_nocc_send_packet_sent(void *ccb, int moreToSend, long size) 3256 { 3257 } 3258 3259 void 3260 dccp_nocc_packet_recv(void *ccb, char* options ,int optlen) 3261 { 3262 } 3263 3264 void 3265 dccp_log(int level, const char *format, ...) 3266 { 3267 va_list ap; 3268 3269 va_start(ap, format); 3270 vprintf(format, ap); 3271 va_end(ap); 3272 return; 3273 } 3274 3275 /* 3276 * Sysctl for dccp variables. 3277 */ 3278 SYSCTL_SETUP(sysctl_net_inet_dccp_setup, "sysctl net.inet.dccp subtree setup") 3279 { 3280 3281 sysctl_createv(clog, 0, NULL, NULL, 3282 CTLFLAG_PERMANENT, 3283 CTLTYPE_NODE, "net", NULL, 3284 NULL, 0, NULL, 0, 3285 CTL_NET, CTL_EOL); 3286 3287 sysctl_createv(clog, 0, NULL, NULL, 3288 CTLFLAG_PERMANENT, 3289 CTLTYPE_NODE, "inet", NULL, 3290 NULL, 0, NULL, 0, 3291 CTL_NET, PF_INET, CTL_EOL); 3292 3293 sysctl_createv(clog, 0, NULL, NULL, 3294 CTLFLAG_PERMANENT, 3295 CTLTYPE_NODE, "dccp", 3296 SYSCTL_DESCR("DCCPv4 related settings"), 3297 NULL, 0, NULL, 0, 3298 CTL_NET, PF_INET, IPPROTO_DCCP, CTL_EOL); 3299 3300 sysctl_createv(clog, 0, NULL, NULL, 3301 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3302 CTLTYPE_INT, "dccp_log_in_vain", 3303 SYSCTL_DESCR("log all connection attempt"), 3304 NULL, 0, &dccp_log_in_vain, 0, 3305 CTL_NET, PF_INET, IPPROTO_DCCP, DCCPCTL_LOGINVAIN, 3306 CTL_EOL); 3307 3308 sysctl_createv(clog, 0, NULL, NULL, 3309 CTLFLAG_PERMANENT|CTLFLAG_READWRITE, 3310 CTLTYPE_INT, "do_feature_nego", 3311 SYSCTL_DESCR("enable feature negotiation"), 3312 NULL, 0, &dccp_do_feature_nego, 0, 3313 CTL_NET, PF_INET, IPPROTO_DCCP, DCCPCTL_DOFEATURENEGO, 3314 CTL_EOL); 3315 } 3316 3317 PR_WRAP_USRREQS(dccp) 3318 #define dccp_attach dccp_attach_wrapper 3319 #define dccp_detach dccp_detach_wrapper 3320 #define dccp_accept dccp_accept_wrapper 3321 #define dccp_bind dccp_bind_wrapper 3322 #define dccp_listen dccp_listen_wrapper 3323 #define dccp_connect dccp_connect_wrapper 3324 #define dccp_connect2 dccp_connect2_wrapper 3325 #define dccp_disconnect dccp_disconnect_wrapper 3326 #define dccp_shutdown dccp_shutdown_wrapper 3327 #define dccp_abort dccp_abort_wrapper 3328 #define dccp_ioctl dccp_ioctl_wrapper 3329 #define dccp_stat dccp_stat_wrapper 3330 #define dccp_peeraddr dccp_peeraddr_wrapper 3331 #define dccp_sockaddr dccp_sockaddr_wrapper 3332 #define dccp_rcvd dccp_rcvd_wrapper 3333 #define dccp_recvoob dccp_recvoob_wrapper 3334 #define dccp_send dccp_send_wrapper 3335 #define dccp_sendoob dccp_sendoob_wrapper 3336 #define dccp_purgeif dccp_purgeif_wrapper 3337 3338 const struct pr_usrreqs dccp_usrreqs = { 3339 .pr_attach = dccp_attach, 3340 .pr_detach = dccp_detach, 3341 .pr_accept = dccp_accept, 3342 .pr_bind = dccp_bind, 3343 .pr_listen = dccp_listen, 3344 .pr_connect = dccp_connect, 3345 .pr_connect2 = dccp_connect2, 3346 .pr_disconnect = dccp_disconnect, 3347 .pr_shutdown = dccp_shutdown, 3348 .pr_abort = dccp_abort, 3349 .pr_ioctl = dccp_ioctl, 3350 .pr_stat = dccp_stat, 3351 .pr_peeraddr = dccp_peeraddr, 3352 .pr_sockaddr = dccp_sockaddr, 3353 .pr_rcvd = dccp_rcvd, 3354 .pr_recvoob = dccp_recvoob, 3355 .pr_send = dccp_send, 3356 .pr_sendoob = dccp_sendoob, 3357 .pr_purgeif = dccp_purgeif, 3358 }; 3359
Indexes created Sun Sep 21 20:09:37 GMT 2025