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sys/altq/altq_subr.c
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1 /* $NetBSD: altq_subr.c,v 1.25.8.2 2008/12/01 00:57:03 snj Exp $ */ 2 /* $KAME: altq_subr.c,v 1.24 2005/04/13 03:44:25 suz Exp $ */ 3 4 /* 5 * Copyright (C) 1997-2003 6 * Sony Computer Science Laboratories Inc. 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 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY SONY CSL AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL SONY CSL OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __KERNEL_RCSID(0, "$NetBSD: altq_subr.c,v 1.25.8.2 2008/12/01 00:57:03 snj Exp $"); 32 33 #ifdef _KERNEL_OPT 34 #include "opt_altq.h" 35 #include "opt_inet.h" 36 #include "pf.h" 37 #endif 38 39 #include <sys/param.h> 40 #include <sys/malloc.h> 41 #include <sys/mbuf.h> 42 #include <sys/systm.h> 43 #include <sys/proc.h> 44 #include <sys/socket.h> 45 #include <sys/socketvar.h> 46 #include <sys/kernel.h> 47 #include <sys/errno.h> 48 #include <sys/syslog.h> 49 #include <sys/sysctl.h> 50 #include <sys/queue.h> 51 52 #include <net/if.h> 53 #include <net/if_dl.h> 54 #include <net/if_types.h> 55 56 #include <netinet/in.h> 57 #include <netinet/in_systm.h> 58 #include <netinet/ip.h> 59 #ifdef INET6 60 #include <netinet/ip6.h> 61 #endif 62 #include <netinet/tcp.h> 63 #include <netinet/udp.h> 64 65 #if NPF > 0 66 #include <net/pfvar.h> 67 #endif 68 #include <altq/altq.h> 69 #ifdef ALTQ3_COMPAT 70 #include <altq/altq_conf.h> 71 #endif 72 73 /* 74 * internal function prototypes 75 */ 76 static void tbr_timeout(void *); 77 int (*altq_input)(struct mbuf *, int) = NULL; 78 static int tbr_timer = 0; /* token bucket regulator timer */ 79 static struct callout tbr_callout; 80 81 #ifdef ALTQ3_CLFIER_COMPAT 82 static int extract_ports4(struct mbuf *, struct ip *, struct flowinfo_in *); 83 #ifdef INET6 84 static int extract_ports6(struct mbuf *, struct ip6_hdr *, 85 struct flowinfo_in6 *); 86 #endif 87 static int apply_filter4(u_int32_t, struct flow_filter *, 88 struct flowinfo_in *); 89 static int apply_ppfilter4(u_int32_t, struct flow_filter *, 90 struct flowinfo_in *); 91 #ifdef INET6 92 static int apply_filter6(u_int32_t, struct flow_filter6 *, 93 struct flowinfo_in6 *); 94 #endif 95 static int apply_tosfilter4(u_int32_t, struct flow_filter *, 96 struct flowinfo_in *); 97 static u_long get_filt_handle(struct acc_classifier *, int); 98 static struct acc_filter *filth_to_filtp(struct acc_classifier *, u_long); 99 static u_int32_t filt2fibmask(struct flow_filter *); 100 101 static void ip4f_cache(struct ip *, struct flowinfo_in *); 102 static int ip4f_lookup(struct ip *, struct flowinfo_in *); 103 static int ip4f_init(void); 104 static struct ip4_frag *ip4f_alloc(void); 105 static void ip4f_free(struct ip4_frag *); 106 #endif /* ALTQ3_CLFIER_COMPAT */ 107 108 /* 109 * alternate queueing support routines 110 */ 111 112 /* look up the queue state by the interface name and the queueing type. */ 113 void * 114 altq_lookup(char *name, int type) 115 { 116 struct ifnet *ifp; 117 118 if ((ifp = ifunit(name)) != NULL) { 119 if (type != ALTQT_NONE && ifp->if_snd.altq_type == type) 120 return (ifp->if_snd.altq_disc); 121 } 122 123 return NULL; 124 } 125 126 int 127 altq_attach(struct ifaltq *ifq, int type, void *discipline, 128 int (*enqueue)(struct ifaltq *, struct mbuf *, struct altq_pktattr *), 129 struct mbuf *(*dequeue)(struct ifaltq *, int), 130 int (*request)(struct ifaltq *, int, void *), 131 void *clfier, void *(*classify)(void *, struct mbuf *, int)) 132 { 133 if (!ALTQ_IS_READY(ifq)) 134 return ENXIO; 135 136 #ifdef ALTQ3_COMPAT 137 /* 138 * pfaltq can override the existing discipline, but altq3 cannot. 139 * check these if clfier is not NULL (which implies altq3). 140 */ 141 if (clfier != NULL) { 142 if (ALTQ_IS_ENABLED(ifq)) 143 return EBUSY; 144 if (ALTQ_IS_ATTACHED(ifq)) 145 return EEXIST; 146 } 147 #endif 148 ifq->altq_type = type; 149 ifq->altq_disc = discipline; 150 ifq->altq_enqueue = enqueue; 151 ifq->altq_dequeue = dequeue; 152 ifq->altq_request = request; 153 ifq->altq_clfier = clfier; 154 ifq->altq_classify = classify; 155 ifq->altq_flags &= (ALTQF_CANTCHANGE|ALTQF_ENABLED); 156 #ifdef ALTQ3_COMPAT 157 #ifdef ALTQ_KLD 158 altq_module_incref(type); 159 #endif 160 #endif 161 return 0; 162 } 163 164 int 165 altq_detach(struct ifaltq *ifq) 166 { 167 if (!ALTQ_IS_READY(ifq)) 168 return ENXIO; 169 if (ALTQ_IS_ENABLED(ifq)) 170 return EBUSY; 171 if (!ALTQ_IS_ATTACHED(ifq)) 172 return (0); 173 #ifdef ALTQ3_COMPAT 174 #ifdef ALTQ_KLD 175 altq_module_declref(ifq->altq_type); 176 #endif 177 #endif 178 179 ifq->altq_type = ALTQT_NONE; 180 ifq->altq_disc = NULL; 181 ifq->altq_enqueue = NULL; 182 ifq->altq_dequeue = NULL; 183 ifq->altq_request = NULL; 184 ifq->altq_clfier = NULL; 185 ifq->altq_classify = NULL; 186 ifq->altq_flags &= ALTQF_CANTCHANGE; 187 return 0; 188 } 189 190 int 191 altq_enable(struct ifaltq *ifq) 192 { 193 int s; 194 195 if (!ALTQ_IS_READY(ifq)) 196 return ENXIO; 197 if (ALTQ_IS_ENABLED(ifq)) 198 return 0; 199 200 s = splnet(); 201 IFQ_PURGE(ifq); 202 ASSERT(ifq->ifq_len == 0); 203 ifq->altq_flags |= ALTQF_ENABLED; 204 if (ifq->altq_clfier != NULL) 205 ifq->altq_flags |= ALTQF_CLASSIFY; 206 splx(s); 207 208 return 0; 209 } 210 211 int 212 altq_disable(struct ifaltq *ifq) 213 { 214 int s; 215 216 if (!ALTQ_IS_ENABLED(ifq)) 217 return 0; 218 219 s = splnet(); 220 IFQ_PURGE(ifq); 221 ASSERT(ifq->ifq_len == 0); 222 ifq->altq_flags &= ~(ALTQF_ENABLED|ALTQF_CLASSIFY); 223 splx(s); 224 return 0; 225 } 226 227 #ifdef ALTQ_DEBUG 228 void 229 altq_assert(const char *file, int line, const char *failedexpr) 230 { 231 (void)printf("altq assertion \"%s\" failed: file \"%s\", line %d\n", 232 failedexpr, file, line); 233 panic("altq assertion"); 234 /* NOTREACHED */ 235 } 236 #endif 237 238 /* 239 * internal representation of token bucket parameters 240 * rate: byte_per_unittime << 32 241 * (((bits_per_sec) / 8) << 32) / machclk_freq 242 * depth: byte << 32 243 * 244 */ 245 #define TBR_SHIFT 32 246 #define TBR_SCALE(x) ((int64_t)(x) << TBR_SHIFT) 247 #define TBR_UNSCALE(x) ((x) >> TBR_SHIFT) 248 249 struct mbuf * 250 tbr_dequeue(struct ifaltq *ifq, int op) 251 { 252 struct tb_regulator *tbr; 253 struct mbuf *m; 254 int64_t interval; 255 u_int64_t now; 256 257 tbr = ifq->altq_tbr; 258 if (op == ALTDQ_REMOVE && tbr->tbr_lastop == ALTDQ_POLL) { 259 /* if this is a remove after poll, bypass tbr check */ 260 } else { 261 /* update token only when it is negative */ 262 if (tbr->tbr_token <= 0) { 263 now = read_machclk(); 264 interval = now - tbr->tbr_last; 265 if (interval >= tbr->tbr_filluptime) 266 tbr->tbr_token = tbr->tbr_depth; 267 else { 268 tbr->tbr_token += interval * tbr->tbr_rate; 269 if (tbr->tbr_token > tbr->tbr_depth) 270 tbr->tbr_token = tbr->tbr_depth; 271 } 272 tbr->tbr_last = now; 273 } 274 /* if token is still negative, don't allow dequeue */ 275 if (tbr->tbr_token <= 0) 276 return (NULL); 277 } 278 279 if (ALTQ_IS_ENABLED(ifq)) 280 m = (*ifq->altq_dequeue)(ifq, op); 281 else { 282 if (op == ALTDQ_POLL) 283 IF_POLL(ifq, m); 284 else 285 IF_DEQUEUE(ifq, m); 286 } 287 288 if (m != NULL && op == ALTDQ_REMOVE) 289 tbr->tbr_token -= TBR_SCALE(m_pktlen(m)); 290 tbr->tbr_lastop = op; 291 return (m); 292 } 293 294 /* 295 * set a token bucket regulator. 296 * if the specified rate is zero, the token bucket regulator is deleted. 297 */ 298 int 299 tbr_set(struct ifaltq *ifq, struct tb_profile *profile) 300 { 301 struct tb_regulator *tbr, *otbr; 302 303 if (machclk_freq == 0) 304 init_machclk(); 305 if (machclk_freq == 0) { 306 printf("tbr_set: no CPU clock available!\n"); 307 return (ENXIO); 308 } 309 310 if (profile->rate == 0) { 311 /* delete this tbr */ 312 if ((tbr = ifq->altq_tbr) == NULL) 313 return (ENOENT); 314 ifq->altq_tbr = NULL; 315 free(tbr, M_DEVBUF); 316 return (0); 317 } 318 319 tbr = malloc(sizeof(struct tb_regulator), M_DEVBUF, M_WAITOK|M_ZERO); 320 if (tbr == NULL) 321 return (ENOMEM); 322 323 tbr->tbr_rate = TBR_SCALE(profile->rate / 8) / machclk_freq; 324 tbr->tbr_depth = TBR_SCALE(profile->depth); 325 if (tbr->tbr_rate > 0) 326 tbr->tbr_filluptime = tbr->tbr_depth / tbr->tbr_rate; 327 else 328 tbr->tbr_filluptime = 0xffffffffffffffffLL; 329 tbr->tbr_token = tbr->tbr_depth; 330 tbr->tbr_last = read_machclk(); 331 tbr->tbr_lastop = ALTDQ_REMOVE; 332 333 otbr = ifq->altq_tbr; 334 ifq->altq_tbr = tbr; /* set the new tbr */ 335 336 if (otbr != NULL) 337 free(otbr, M_DEVBUF); 338 else { 339 if (tbr_timer == 0) { 340 CALLOUT_RESET(&tbr_callout, 1, tbr_timeout, (void *)0); 341 tbr_timer = 1; 342 } 343 } 344 return (0); 345 } 346 347 /* 348 * tbr_timeout goes through the interface list, and kicks the drivers 349 * if necessary. 350 */ 351 static void 352 tbr_timeout(void *arg) 353 { 354 struct ifnet *ifp; 355 int active, s; 356 357 active = 0; 358 s = splnet(); 359 for (ifp = TAILQ_FIRST(&ifnet); ifp; ifp = TAILQ_NEXT(ifp, if_list)) { 360 if (!TBR_IS_ENABLED(&ifp->if_snd)) 361 continue; 362 active++; 363 if (!IFQ_IS_EMPTY(&ifp->if_snd) && ifp->if_start != NULL) 364 (*ifp->if_start)(ifp); 365 } 366 splx(s); 367 if (active > 0) 368 CALLOUT_RESET(&tbr_callout, 1, tbr_timeout, (void *)0); 369 else 370 tbr_timer = 0; /* don't need tbr_timer anymore */ 371 } 372 373 /* 374 * get token bucket regulator profile 375 */ 376 int 377 tbr_get(struct ifaltq *ifq, struct tb_profile *profile) 378 { 379 struct tb_regulator *tbr; 380 381 if ((tbr = ifq->altq_tbr) == NULL) { 382 profile->rate = 0; 383 profile->depth = 0; 384 } else { 385 profile->rate = 386 (u_int)TBR_UNSCALE(tbr->tbr_rate * 8 * machclk_freq); 387 profile->depth = (u_int)TBR_UNSCALE(tbr->tbr_depth); 388 } 389 return (0); 390 } 391 392 #if NPF > 0 393 /* 394 * attach a discipline to the interface. if one already exists, it is 395 * overridden. 396 */ 397 int 398 altq_pfattach(struct pf_altq *a) 399 { 400 int error = 0; 401 402 switch (a->scheduler) { 403 case ALTQT_NONE: 404 break; 405 #ifdef ALTQ_CBQ 406 case ALTQT_CBQ: 407 error = cbq_pfattach(a); 408 break; 409 #endif 410 #ifdef ALTQ_PRIQ 411 case ALTQT_PRIQ: 412 error = priq_pfattach(a); 413 break; 414 #endif 415 #ifdef ALTQ_HFSC 416 case ALTQT_HFSC: 417 error = hfsc_pfattach(a); 418 break; 419 #endif 420 default: 421 error = ENXIO; 422 } 423 424 return (error); 425 } 426 427 /* 428 * detach a discipline from the interface. 429 * it is possible that the discipline was already overridden by another 430 * discipline. 431 */ 432 int 433 altq_pfdetach(struct pf_altq *a) 434 { 435 struct ifnet *ifp; 436 int s, error = 0; 437 438 if ((ifp = ifunit(a->ifname)) == NULL) 439 return (EINVAL); 440 441 /* if this discipline is no longer referenced, just return */ 442 if (a->altq_disc == NULL || a->altq_disc != ifp->if_snd.altq_disc) 443 return (0); 444 445 s = splnet(); 446 if (ALTQ_IS_ENABLED(&ifp->if_snd)) 447 error = altq_disable(&ifp->if_snd); 448 if (error == 0) 449 error = altq_detach(&ifp->if_snd); 450 splx(s); 451 452 return (error); 453 } 454 455 /* 456 * add a discipline or a queue 457 */ 458 int 459 altq_add(struct pf_altq *a) 460 { 461 int error = 0; 462 463 if (a->qname[0] != 0) 464 return (altq_add_queue(a)); 465 466 if (machclk_freq == 0) 467 init_machclk(); 468 if (machclk_freq == 0) 469 panic("altq_add: no CPU clock"); 470 471 switch (a->scheduler) { 472 #ifdef ALTQ_CBQ 473 case ALTQT_CBQ: 474 error = cbq_add_altq(a); 475 break; 476 #endif 477 #ifdef ALTQ_PRIQ 478 case ALTQT_PRIQ: 479 error = priq_add_altq(a); 480 break; 481 #endif 482 #ifdef ALTQ_HFSC 483 case ALTQT_HFSC: 484 error = hfsc_add_altq(a); 485 break; 486 #endif 487 default: 488 error = ENXIO; 489 } 490 491 return (error); 492 } 493 494 /* 495 * remove a discipline or a queue 496 */ 497 int 498 altq_remove(struct pf_altq *a) 499 { 500 int error = 0; 501 502 if (a->qname[0] != 0) 503 return (altq_remove_queue(a)); 504 505 switch (a->scheduler) { 506 #ifdef ALTQ_CBQ 507 case ALTQT_CBQ: 508 error = cbq_remove_altq(a); 509 break; 510 #endif 511 #ifdef ALTQ_PRIQ 512 case ALTQT_PRIQ: 513 error = priq_remove_altq(a); 514 break; 515 #endif 516 #ifdef ALTQ_HFSC 517 case ALTQT_HFSC: 518 error = hfsc_remove_altq(a); 519 break; 520 #endif 521 default: 522 error = ENXIO; 523 } 524 525 return (error); 526 } 527 528 /* 529 * add a queue to the discipline 530 */ 531 int 532 altq_add_queue(struct pf_altq *a) 533 { 534 int error = 0; 535 536 switch (a->scheduler) { 537 #ifdef ALTQ_CBQ 538 case ALTQT_CBQ: 539 error = cbq_add_queue(a); 540 break; 541 #endif 542 #ifdef ALTQ_PRIQ 543 case ALTQT_PRIQ: 544 error = priq_add_queue(a); 545 break; 546 #endif 547 #ifdef ALTQ_HFSC 548 case ALTQT_HFSC: 549 error = hfsc_add_queue(a); 550 break; 551 #endif 552 default: 553 error = ENXIO; 554 } 555 556 return (error); 557 } 558 559 /* 560 * remove a queue from the discipline 561 */ 562 int 563 altq_remove_queue(struct pf_altq *a) 564 { 565 int error = 0; 566 567 switch (a->scheduler) { 568 #ifdef ALTQ_CBQ 569 case ALTQT_CBQ: 570 error = cbq_remove_queue(a); 571 break; 572 #endif 573 #ifdef ALTQ_PRIQ 574 case ALTQT_PRIQ: 575 error = priq_remove_queue(a); 576 break; 577 #endif 578 #ifdef ALTQ_HFSC 579 case ALTQT_HFSC: 580 error = hfsc_remove_queue(a); 581 break; 582 #endif 583 default: 584 error = ENXIO; 585 } 586 587 return (error); 588 } 589 590 /* 591 * get queue statistics 592 */ 593 int 594 altq_getqstats(struct pf_altq *a, void *ubuf, int *nbytes) 595 { 596 int error = 0; 597 598 switch (a->scheduler) { 599 #ifdef ALTQ_CBQ 600 case ALTQT_CBQ: 601 error = cbq_getqstats(a, ubuf, nbytes); 602 break; 603 #endif 604 #ifdef ALTQ_PRIQ 605 case ALTQT_PRIQ: 606 error = priq_getqstats(a, ubuf, nbytes); 607 break; 608 #endif 609 #ifdef ALTQ_HFSC 610 case ALTQT_HFSC: 611 error = hfsc_getqstats(a, ubuf, nbytes); 612 break; 613 #endif 614 default: 615 error = ENXIO; 616 } 617 618 return (error); 619 } 620 #endif /* NPF > 0 */ 621 622 /* 623 * read and write diffserv field in IPv4 or IPv6 header 624 */ 625 u_int8_t 626 read_dsfield(struct mbuf *m, struct altq_pktattr *pktattr) 627 { 628 struct mbuf *m0; 629 u_int8_t ds_field = 0; 630 631 if (pktattr == NULL || 632 (pktattr->pattr_af != AF_INET && pktattr->pattr_af != AF_INET6)) 633 return ((u_int8_t)0); 634 635 /* verify that pattr_hdr is within the mbuf data */ 636 for (m0 = m; m0 != NULL; m0 = m0->m_next) 637 if (((char *)pktattr->pattr_hdr >= m0->m_data) && 638 ((char *)pktattr->pattr_hdr < m0->m_data + m0->m_len)) 639 break; 640 if (m0 == NULL) { 641 /* ick, pattr_hdr is stale */ 642 pktattr->pattr_af = AF_UNSPEC; 643 #ifdef ALTQ_DEBUG 644 printf("read_dsfield: can't locate header!\n"); 645 #endif 646 return ((u_int8_t)0); 647 } 648 649 if (pktattr->pattr_af == AF_INET) { 650 struct ip *ip = (struct ip *)pktattr->pattr_hdr; 651 652 if (ip->ip_v != 4) 653 return ((u_int8_t)0); /* version mismatch! */ 654 ds_field = ip->ip_tos; 655 } 656 #ifdef INET6 657 else if (pktattr->pattr_af == AF_INET6) { 658 struct ip6_hdr *ip6 = (struct ip6_hdr *)pktattr->pattr_hdr; 659 u_int32_t flowlabel; 660 661 flowlabel = ntohl(ip6->ip6_flow); 662 if ((flowlabel >> 28) != 6) 663 return ((u_int8_t)0); /* version mismatch! */ 664 ds_field = (flowlabel >> 20) & 0xff; 665 } 666 #endif 667 return (ds_field); 668 } 669 670 void 671 write_dsfield(struct mbuf *m, struct altq_pktattr *pktattr, u_int8_t dsfield) 672 { 673 struct mbuf *m0; 674 675 if (pktattr == NULL || 676 (pktattr->pattr_af != AF_INET && pktattr->pattr_af != AF_INET6)) 677 return; 678 679 /* verify that pattr_hdr is within the mbuf data */ 680 for (m0 = m; m0 != NULL; m0 = m0->m_next) 681 if (((char *)pktattr->pattr_hdr >= m0->m_data) && 682 ((char *)pktattr->pattr_hdr < m0->m_data + m0->m_len)) 683 break; 684 if (m0 == NULL) { 685 /* ick, pattr_hdr is stale */ 686 pktattr->pattr_af = AF_UNSPEC; 687 #ifdef ALTQ_DEBUG 688 printf("write_dsfield: can't locate header!\n"); 689 #endif 690 return; 691 } 692 693 if (pktattr->pattr_af == AF_INET) { 694 struct ip *ip = (struct ip *)pktattr->pattr_hdr; 695 u_int8_t old; 696 int32_t sum; 697 698 if (ip->ip_v != 4) 699 return; /* version mismatch! */ 700 old = ip->ip_tos; 701 dsfield |= old & 3; /* leave CU bits */ 702 if (old == dsfield) 703 return; 704 ip->ip_tos = dsfield; 705 /* 706 * update checksum (from RFC1624) 707 * HC' = ~(~HC + ~m + m') 708 */ 709 sum = ~ntohs(ip->ip_sum) & 0xffff; 710 sum += 0xff00 + (~old & 0xff) + dsfield; 711 sum = (sum >> 16) + (sum & 0xffff); 712 sum += (sum >> 16); /* add carry */ 713 714 ip->ip_sum = htons(~sum & 0xffff); 715 } 716 #ifdef INET6 717 else if (pktattr->pattr_af == AF_INET6) { 718 struct ip6_hdr *ip6 = (struct ip6_hdr *)pktattr->pattr_hdr; 719 u_int32_t flowlabel; 720 721 flowlabel = ntohl(ip6->ip6_flow); 722 if ((flowlabel >> 28) != 6) 723 return; /* version mismatch! */ 724 flowlabel = (flowlabel & 0xf03fffff) | (dsfield << 20); 725 ip6->ip6_flow = htonl(flowlabel); 726 } 727 #endif 728 return; 729 } 730 731 #define BINTIME_SHIFT 2 732 733 u_int32_t machclk_freq = 0; 734 u_int32_t machclk_per_tick = 0; 735 736 void 737 init_machclk(void) 738 { 739 740 callout_init(&tbr_callout, 0); 741 742 /* 743 * Always emulate 1GiHz counter using bintime(9) 744 * since it has enough resolution via timecounter(9). 745 * Using machine dependent cpu_counter() is not MP safe 746 * and it won't work even on UP with Speedstep etc. 747 */ 748 machclk_freq = 1024 * 1024 * 1024; /* 2^30 to emulate ~1GHz */ 749 machclk_per_tick = machclk_freq / hz; 750 #ifdef ALTQ_DEBUG 751 printf("altq: emulate %uHz CPU clock\n", machclk_freq); 752 #endif 753 } 754 755 u_int64_t 756 read_machclk(void) 757 { 758 struct bintime bt; 759 u_int64_t val; 760 761 binuptime(&bt); 762 val = (((u_int64_t)bt.sec << 32) + (bt.frac >> 32)) >> BINTIME_SHIFT; 763 return (val); 764 } 765 766 #ifdef ALTQ3_CLFIER_COMPAT 767 768 #ifndef IPPROTO_ESP 769 #define IPPROTO_ESP 50 /* encapsulating security payload */ 770 #endif 771 #ifndef IPPROTO_AH 772 #define IPPROTO_AH 51 /* authentication header */ 773 #endif 774 775 /* 776 * extract flow information from a given packet. 777 * filt_mask shows flowinfo fields required. 778 * we assume the ip header is in one mbuf, and addresses and ports are 779 * in network byte order. 780 */ 781 int 782 altq_extractflow(struct mbuf *m, int af, struct flowinfo *flow, 783 u_int32_t filt_bmask) 784 { 785 786 switch (af) { 787 case PF_INET: { 788 struct flowinfo_in *fin; 789 struct ip *ip; 790 791 ip = mtod(m, struct ip *); 792 793 if (ip->ip_v != 4) 794 break; 795 796 fin = (struct flowinfo_in *)flow; 797 fin->fi_len = sizeof(struct flowinfo_in); 798 fin->fi_family = AF_INET; 799 800 fin->fi_proto = ip->ip_p; 801 fin->fi_tos = ip->ip_tos; 802 803 fin->fi_src.s_addr = ip->ip_src.s_addr; 804 fin->fi_dst.s_addr = ip->ip_dst.s_addr; 805 806 if (filt_bmask & FIMB4_PORTS) 807 /* if port info is required, extract port numbers */ 808 extract_ports4(m, ip, fin); 809 else { 810 fin->fi_sport = 0; 811 fin->fi_dport = 0; 812 fin->fi_gpi = 0; 813 } 814 return (1); 815 } 816 817 #ifdef INET6 818 case PF_INET6: { 819 struct flowinfo_in6 *fin6; 820 struct ip6_hdr *ip6; 821 822 ip6 = mtod(m, struct ip6_hdr *); 823 /* should we check the ip version? */ 824 825 fin6 = (struct flowinfo_in6 *)flow; 826 fin6->fi6_len = sizeof(struct flowinfo_in6); 827 fin6->fi6_family = AF_INET6; 828 829 fin6->fi6_proto = ip6->ip6_nxt; 830 fin6->fi6_tclass = (ntohl(ip6->ip6_flow) >> 20) & 0xff; 831 832 fin6->fi6_flowlabel = ip6->ip6_flow & htonl(0x000fffff); 833 fin6->fi6_src = ip6->ip6_src; 834 fin6->fi6_dst = ip6->ip6_dst; 835 836 if ((filt_bmask & FIMB6_PORTS) || 837 ((filt_bmask & FIMB6_PROTO) 838 && ip6->ip6_nxt > IPPROTO_IPV6)) 839 /* 840 * if port info is required, or proto is required 841 * but there are option headers, extract port 842 * and protocol numbers. 843 */ 844 extract_ports6(m, ip6, fin6); 845 else { 846 fin6->fi6_sport = 0; 847 fin6->fi6_dport = 0; 848 fin6->fi6_gpi = 0; 849 } 850 return (1); 851 } 852 #endif /* INET6 */ 853 854 default: 855 break; 856 } 857 858 /* failed */ 859 flow->fi_len = sizeof(struct flowinfo); 860 flow->fi_family = AF_UNSPEC; 861 return (0); 862 } 863 864 /* 865 * helper routine to extract port numbers 866 */ 867 /* structure for ipsec and ipv6 option header template */ 868 struct _opt6 { 869 u_int8_t opt6_nxt; /* next header */ 870 u_int8_t opt6_hlen; /* header extension length */ 871 u_int16_t _pad; 872 u_int32_t ah_spi; /* security parameter index 873 for authentication header */ 874 }; 875 876 /* 877 * extract port numbers from a ipv4 packet. 878 */ 879 static int 880 extract_ports4(struct mbuf *m, struct ip *ip, struct flowinfo_in *fin) 881 { 882 struct mbuf *m0; 883 u_short ip_off; 884 u_int8_t proto; 885 int off; 886 887 fin->fi_sport = 0; 888 fin->fi_dport = 0; 889 fin->fi_gpi = 0; 890 891 ip_off = ntohs(ip->ip_off); 892 /* if it is a fragment, try cached fragment info */ 893 if (ip_off & IP_OFFMASK) { 894 ip4f_lookup(ip, fin); 895 return (1); 896 } 897 898 /* locate the mbuf containing the protocol header */ 899 for (m0 = m; m0 != NULL; m0 = m0->m_next) 900 if (((char *)ip >= m0->m_data) && 901 ((char *)ip < m0->m_data + m0->m_len)) 902 break; 903 if (m0 == NULL) { 904 #ifdef ALTQ_DEBUG 905 printf("extract_ports4: can't locate header! ip=%p\n", ip); 906 #endif 907 return (0); 908 } 909 off = ((char *)ip - m0->m_data) + (ip->ip_hl << 2); 910 proto = ip->ip_p; 911 912 #ifdef ALTQ_IPSEC 913 again: 914 #endif 915 while (off >= m0->m_len) { 916 off -= m0->m_len; 917 m0 = m0->m_next; 918 if (m0 == NULL) 919 return (0); /* bogus ip_hl! */ 920 } 921 if (m0->m_len < off + 4) 922 return (0); 923 924 switch (proto) { 925 case IPPROTO_TCP: 926 case IPPROTO_UDP: { 927 struct udphdr *udp; 928 929 udp = (struct udphdr *)(mtod(m0, char *) + off); 930 fin->fi_sport = udp->uh_sport; 931 fin->fi_dport = udp->uh_dport; 932 fin->fi_proto = proto; 933 } 934 break; 935 936 #ifdef ALTQ_IPSEC 937 case IPPROTO_ESP: 938 if (fin->fi_gpi == 0){ 939 u_int32_t *gpi; 940 941 gpi = (u_int32_t *)(mtod(m0, char *) + off); 942 fin->fi_gpi = *gpi; 943 } 944 fin->fi_proto = proto; 945 break; 946 947 case IPPROTO_AH: { 948 /* get next header and header length */ 949 struct _opt6 *opt6; 950 951 opt6 = (struct _opt6 *)(mtod(m0, char *) + off); 952 proto = opt6->opt6_nxt; 953 off += 8 + (opt6->opt6_hlen * 4); 954 if (fin->fi_gpi == 0 && m0->m_len >= off + 8) 955 fin->fi_gpi = opt6->ah_spi; 956 } 957 /* goto the next header */ 958 goto again; 959 #endif /* ALTQ_IPSEC */ 960 961 default: 962 fin->fi_proto = proto; 963 return (0); 964 } 965 966 /* if this is a first fragment, cache it. */ 967 if (ip_off & IP_MF) 968 ip4f_cache(ip, fin); 969 970 return (1); 971 } 972 973 #ifdef INET6 974 static int 975 extract_ports6(struct mbuf *m, struct ip6_hdr *ip6, struct flowinfo_in6 *fin6) 976 { 977 struct mbuf *m0; 978 int off; 979 u_int8_t proto; 980 981 fin6->fi6_gpi = 0; 982 fin6->fi6_sport = 0; 983 fin6->fi6_dport = 0; 984 985 /* locate the mbuf containing the protocol header */ 986 for (m0 = m; m0 != NULL; m0 = m0->m_next) 987 if (((char *)ip6 >= m0->m_data) && 988 ((char *)ip6 < m0->m_data + m0->m_len)) 989 break; 990 if (m0 == NULL) { 991 #ifdef ALTQ_DEBUG 992 printf("extract_ports6: can't locate header! ip6=%p\n", ip6); 993 #endif 994 return (0); 995 } 996 off = ((char *)ip6 - m0->m_data) + sizeof(struct ip6_hdr); 997 998 proto = ip6->ip6_nxt; 999 do { 1000 while (off >= m0->m_len) { 1001 off -= m0->m_len; 1002 m0 = m0->m_next; 1003 if (m0 == NULL) 1004 return (0); 1005 } 1006 if (m0->m_len < off + 4) 1007 return (0); 1008 1009 switch (proto) { 1010 case IPPROTO_TCP: 1011 case IPPROTO_UDP: { 1012 struct udphdr *udp; 1013 1014 udp = (struct udphdr *)(mtod(m0, char *) + off); 1015 fin6->fi6_sport = udp->uh_sport; 1016 fin6->fi6_dport = udp->uh_dport; 1017 fin6->fi6_proto = proto; 1018 } 1019 return (1); 1020 1021 case IPPROTO_ESP: 1022 if (fin6->fi6_gpi == 0) { 1023 u_int32_t *gpi; 1024 1025 gpi = (u_int32_t *)(mtod(m0, char *) + off); 1026 fin6->fi6_gpi = *gpi; 1027 } 1028 fin6->fi6_proto = proto; 1029 return (1); 1030 1031 case IPPROTO_AH: { 1032 /* get next header and header length */ 1033 struct _opt6 *opt6; 1034 1035 opt6 = (struct _opt6 *)(mtod(m0, char *) + off); 1036 if (fin6->fi6_gpi == 0 && m0->m_len >= off + 8) 1037 fin6->fi6_gpi = opt6->ah_spi; 1038 proto = opt6->opt6_nxt; 1039 off += 8 + (opt6->opt6_hlen * 4); 1040 /* goto the next header */ 1041 break; 1042 } 1043 1044 case IPPROTO_HOPOPTS: 1045 case IPPROTO_ROUTING: 1046 case IPPROTO_DSTOPTS: { 1047 /* get next header and header length */ 1048 struct _opt6 *opt6; 1049 1050 opt6 = (struct _opt6 *)(mtod(m0, char *) + off); 1051 proto = opt6->opt6_nxt; 1052 off += (opt6->opt6_hlen + 1) * 8; 1053 /* goto the next header */ 1054 break; 1055 } 1056 1057 case IPPROTO_FRAGMENT: 1058 /* ipv6 fragmentations are not supported yet */ 1059 default: 1060 fin6->fi6_proto = proto; 1061 return (0); 1062 } 1063 } while (1); 1064 /*NOTREACHED*/ 1065 } 1066 #endif /* INET6 */ 1067 1068 /* 1069 * altq common classifier 1070 */ 1071 int 1072 acc_add_filter(struct acc_classifier *classifier, struct flow_filter *filter, 1073 void *class, u_long *phandle) 1074 { 1075 struct acc_filter *afp, *prev, *tmp; 1076 int i, s; 1077 1078 #ifdef INET6 1079 if (filter->ff_flow.fi_family != AF_INET && 1080 filter->ff_flow.fi_family != AF_INET6) 1081 return (EINVAL); 1082 #else 1083 if (filter->ff_flow.fi_family != AF_INET) 1084 return (EINVAL); 1085 #endif 1086 1087 afp = malloc(sizeof(struct acc_filter), M_DEVBUF, M_WAITOK|M_ZERO); 1088 if (afp == NULL) 1089 return (ENOMEM); 1090 1091 afp->f_filter = *filter; 1092 afp->f_class = class; 1093 1094 i = ACC_WILDCARD_INDEX; 1095 if (filter->ff_flow.fi_family == AF_INET) { 1096 struct flow_filter *filter4 = &afp->f_filter; 1097 1098 /* 1099 * if address is 0, it's a wildcard. if address mask 1100 * isn't set, use full mask. 1101 */ 1102 if (filter4->ff_flow.fi_dst.s_addr == 0) 1103 filter4->ff_mask.mask_dst.s_addr = 0; 1104 else if (filter4->ff_mask.mask_dst.s_addr == 0) 1105 filter4->ff_mask.mask_dst.s_addr = 0xffffffff; 1106 if (filter4->ff_flow.fi_src.s_addr == 0) 1107 filter4->ff_mask.mask_src.s_addr = 0; 1108 else if (filter4->ff_mask.mask_src.s_addr == 0) 1109 filter4->ff_mask.mask_src.s_addr = 0xffffffff; 1110 1111 /* clear extra bits in addresses */ 1112 filter4->ff_flow.fi_dst.s_addr &= 1113 filter4->ff_mask.mask_dst.s_addr; 1114 filter4->ff_flow.fi_src.s_addr &= 1115 filter4->ff_mask.mask_src.s_addr; 1116 1117 /* 1118 * if dst address is a wildcard, use hash-entry 1119 * ACC_WILDCARD_INDEX. 1120 */ 1121 if (filter4->ff_mask.mask_dst.s_addr != 0xffffffff) 1122 i = ACC_WILDCARD_INDEX; 1123 else 1124 i = ACC_GET_HASH_INDEX(filter4->ff_flow.fi_dst.s_addr); 1125 } 1126 #ifdef INET6 1127 else if (filter->ff_flow.fi_family == AF_INET6) { 1128 struct flow_filter6 *filter6 = 1129 (struct flow_filter6 *)&afp->f_filter; 1130 #ifndef IN6MASK0 /* taken from kame ipv6 */ 1131 #define IN6MASK0 {{{ 0, 0, 0, 0 }}} 1132 #define IN6MASK128 {{{ 0xffffffff, 0xffffffff, 0xffffffff, 0xffffffff }}} 1133 const struct in6_addr in6mask0 = IN6MASK0; 1134 const struct in6_addr in6mask128 = IN6MASK128; 1135 #endif 1136 1137 if (IN6_IS_ADDR_UNSPECIFIED(&filter6->ff_flow6.fi6_dst)) 1138 filter6->ff_mask6.mask6_dst = in6mask0; 1139 else if (IN6_IS_ADDR_UNSPECIFIED(&filter6->ff_mask6.mask6_dst)) 1140 filter6->ff_mask6.mask6_dst = in6mask128; 1141 if (IN6_IS_ADDR_UNSPECIFIED(&filter6->ff_flow6.fi6_src)) 1142 filter6->ff_mask6.mask6_src = in6mask0; 1143 else if (IN6_IS_ADDR_UNSPECIFIED(&filter6->ff_mask6.mask6_src)) 1144 filter6->ff_mask6.mask6_src = in6mask128; 1145 1146 /* clear extra bits in addresses */ 1147 for (i = 0; i < 16; i++) 1148 filter6->ff_flow6.fi6_dst.s6_addr[i] &= 1149 filter6->ff_mask6.mask6_dst.s6_addr[i]; 1150 for (i = 0; i < 16; i++) 1151 filter6->ff_flow6.fi6_src.s6_addr[i] &= 1152 filter6->ff_mask6.mask6_src.s6_addr[i]; 1153 1154 if (filter6->ff_flow6.fi6_flowlabel == 0) 1155 i = ACC_WILDCARD_INDEX; 1156 else 1157 i = ACC_GET_HASH_INDEX(filter6->ff_flow6.fi6_flowlabel); 1158 } 1159 #endif /* INET6 */ 1160 1161 afp->f_handle = get_filt_handle(classifier, i); 1162 1163 /* update filter bitmask */ 1164 afp->f_fbmask = filt2fibmask(filter); 1165 classifier->acc_fbmask |= afp->f_fbmask; 1166 1167 /* 1168 * add this filter to the filter list. 1169 * filters are ordered from the highest rule number. 1170 */ 1171 s = splnet(); 1172 prev = NULL; 1173 LIST_FOREACH(tmp, &classifier->acc_filters[i], f_chain) { 1174 if (tmp->f_filter.ff_ruleno > afp->f_filter.ff_ruleno) 1175 prev = tmp; 1176 else 1177 break; 1178 } 1179 if (prev == NULL) 1180 LIST_INSERT_HEAD(&classifier->acc_filters[i], afp, f_chain); 1181 else 1182 LIST_INSERT_AFTER(prev, afp, f_chain); 1183 splx(s); 1184 1185 *phandle = afp->f_handle; 1186 return (0); 1187 } 1188 1189 int 1190 acc_delete_filter(struct acc_classifier *classifier, u_long handle) 1191 { 1192 struct acc_filter *afp; 1193 int s; 1194 1195 if ((afp = filth_to_filtp(classifier, handle)) == NULL) 1196 return (EINVAL); 1197 1198 s = splnet(); 1199 LIST_REMOVE(afp, f_chain); 1200 splx(s); 1201 1202 free(afp, M_DEVBUF); 1203 1204 /* todo: update filt_bmask */ 1205 1206 return (0); 1207 } 1208 1209 /* 1210 * delete filters referencing to the specified class. 1211 * if the all flag is not 0, delete all the filters. 1212 */ 1213 int 1214 acc_discard_filters(struct acc_classifier *classifier, void *class, int all) 1215 { 1216 struct acc_filter *afp; 1217 int i, s; 1218 1219 s = splnet(); 1220 for (i = 0; i < ACC_FILTER_TABLESIZE; i++) { 1221 do { 1222 LIST_FOREACH(afp, &classifier->acc_filters[i], f_chain) 1223 if (all || afp->f_class == class) { 1224 LIST_REMOVE(afp, f_chain); 1225 free(afp, M_DEVBUF); 1226 /* start again from the head */ 1227 break; 1228 } 1229 } while (afp != NULL); 1230 } 1231 splx(s); 1232 1233 if (all) 1234 classifier->acc_fbmask = 0; 1235 1236 return (0); 1237 } 1238 1239 void * 1240 acc_classify(void *clfier, struct mbuf *m, int af) 1241 { 1242 struct acc_classifier *classifier; 1243 struct flowinfo flow; 1244 struct acc_filter *afp; 1245 int i; 1246 1247 classifier = (struct acc_classifier *)clfier; 1248 altq_extractflow(m, af, &flow, classifier->acc_fbmask); 1249 1250 if (flow.fi_family == AF_INET) { 1251 struct flowinfo_in *fp = (struct flowinfo_in *)&flow; 1252 1253 if ((classifier->acc_fbmask & FIMB4_ALL) == FIMB4_TOS) { 1254 /* only tos is used */ 1255 LIST_FOREACH(afp, 1256 &classifier->acc_filters[ACC_WILDCARD_INDEX], 1257 f_chain) 1258 if (apply_tosfilter4(afp->f_fbmask, 1259 &afp->f_filter, fp)) 1260 /* filter matched */ 1261 return (afp->f_class); 1262 } else if ((classifier->acc_fbmask & 1263 (~(FIMB4_PROTO|FIMB4_SPORT|FIMB4_DPORT) & FIMB4_ALL)) 1264 == 0) { 1265 /* only proto and ports are used */ 1266 LIST_FOREACH(afp, 1267 &classifier->acc_filters[ACC_WILDCARD_INDEX], 1268 f_chain) 1269 if (apply_ppfilter4(afp->f_fbmask, 1270 &afp->f_filter, fp)) 1271 /* filter matched */ 1272 return (afp->f_class); 1273 } else { 1274 /* get the filter hash entry from its dest address */ 1275 i = ACC_GET_HASH_INDEX(fp->fi_dst.s_addr); 1276 do { 1277 /* 1278 * go through this loop twice. first for dst 1279 * hash, second for wildcards. 1280 */ 1281 LIST_FOREACH(afp, &classifier->acc_filters[i], 1282 f_chain) 1283 if (apply_filter4(afp->f_fbmask, 1284 &afp->f_filter, fp)) 1285 /* filter matched */ 1286 return (afp->f_class); 1287 1288 /* 1289 * check again for filters with a dst addr 1290 * wildcard. 1291 * (daddr == 0 || dmask != 0xffffffff). 1292 */ 1293 if (i != ACC_WILDCARD_INDEX) 1294 i = ACC_WILDCARD_INDEX; 1295 else 1296 break; 1297 } while (1); 1298 } 1299 } 1300 #ifdef INET6 1301 else if (flow.fi_family == AF_INET6) { 1302 struct flowinfo_in6 *fp6 = (struct flowinfo_in6 *)&flow; 1303 1304 /* get the filter hash entry from its flow ID */ 1305 if (fp6->fi6_flowlabel != 0) 1306 i = ACC_GET_HASH_INDEX(fp6->fi6_flowlabel); 1307 else 1308 /* flowlable can be zero */ 1309 i = ACC_WILDCARD_INDEX; 1310 1311 /* go through this loop twice. first for flow hash, second 1312 for wildcards. */ 1313 do { 1314 LIST_FOREACH(afp, &classifier->acc_filters[i], f_chain) 1315 if (apply_filter6(afp->f_fbmask, 1316 (struct flow_filter6 *)&afp->f_filter, 1317 fp6)) 1318 /* filter matched */ 1319 return (afp->f_class); 1320 1321 /* 1322 * check again for filters with a wildcard. 1323 */ 1324 if (i != ACC_WILDCARD_INDEX) 1325 i = ACC_WILDCARD_INDEX; 1326 else 1327 break; 1328 } while (1); 1329 } 1330 #endif /* INET6 */ 1331 1332 /* no filter matched */ 1333 return (NULL); 1334 } 1335 1336 static int 1337 apply_filter4(u_int32_t fbmask, struct flow_filter *filt, 1338 struct flowinfo_in *pkt) 1339 { 1340 if (filt->ff_flow.fi_family != AF_INET) 1341 return (0); 1342 if ((fbmask & FIMB4_SPORT) && filt->ff_flow.fi_sport != pkt->fi_sport) 1343 return (0); 1344 if ((fbmask & FIMB4_DPORT) && filt->ff_flow.fi_dport != pkt->fi_dport) 1345 return (0); 1346 if ((fbmask & FIMB4_DADDR) && 1347 filt->ff_flow.fi_dst.s_addr != 1348 (pkt->fi_dst.s_addr & filt->ff_mask.mask_dst.s_addr)) 1349 return (0); 1350 if ((fbmask & FIMB4_SADDR) && 1351 filt->ff_flow.fi_src.s_addr != 1352 (pkt->fi_src.s_addr & filt->ff_mask.mask_src.s_addr)) 1353 return (0); 1354 if ((fbmask & FIMB4_PROTO) && filt->ff_flow.fi_proto != pkt->fi_proto) 1355 return (0); 1356 if ((fbmask & FIMB4_TOS) && filt->ff_flow.fi_tos != 1357 (pkt->fi_tos & filt->ff_mask.mask_tos)) 1358 return (0); 1359 if ((fbmask & FIMB4_GPI) && filt->ff_flow.fi_gpi != (pkt->fi_gpi)) 1360 return (0); 1361 /* match */ 1362 return (1); 1363 } 1364 1365 /* 1366 * filter matching function optimized for a common case that checks 1367 * only protocol and port numbers 1368 */ 1369 static int 1370 apply_ppfilter4(u_int32_t fbmask, struct flow_filter *filt, 1371 struct flowinfo_in *pkt) 1372 { 1373 if (filt->ff_flow.fi_family != AF_INET) 1374 return (0); 1375 if ((fbmask & FIMB4_SPORT) && filt->ff_flow.fi_sport != pkt->fi_sport) 1376 return (0); 1377 if ((fbmask & FIMB4_DPORT) && filt->ff_flow.fi_dport != pkt->fi_dport) 1378 return (0); 1379 if ((fbmask & FIMB4_PROTO) && filt->ff_flow.fi_proto != pkt->fi_proto) 1380 return (0); 1381 /* match */ 1382 return (1); 1383 } 1384 1385 /* 1386 * filter matching function only for tos field. 1387 */ 1388 static int 1389 apply_tosfilter4(u_int32_t fbmask, struct flow_filter *filt, 1390 struct flowinfo_in *pkt) 1391 { 1392 if (filt->ff_flow.fi_family != AF_INET) 1393 return (0); 1394 if ((fbmask & FIMB4_TOS) && filt->ff_flow.fi_tos != 1395 (pkt->fi_tos & filt->ff_mask.mask_tos)) 1396 return (0); 1397 /* match */ 1398 return (1); 1399 } 1400 1401 #ifdef INET6 1402 static int 1403 apply_filter6(u_int32_t fbmask, struct flow_filter6 *filt, 1404 struct flowinfo_in6 *pkt) 1405 { 1406 int i; 1407 1408 if (filt->ff_flow6.fi6_family != AF_INET6) 1409 return (0); 1410 if ((fbmask & FIMB6_FLABEL) && 1411 filt->ff_flow6.fi6_flowlabel != pkt->fi6_flowlabel) 1412 return (0); 1413 if ((fbmask & FIMB6_PROTO) && 1414 filt->ff_flow6.fi6_proto != pkt->fi6_proto) 1415 return (0); 1416 if ((fbmask & FIMB6_SPORT) && 1417 filt->ff_flow6.fi6_sport != pkt->fi6_sport) 1418 return (0); 1419 if ((fbmask & FIMB6_DPORT) && 1420 filt->ff_flow6.fi6_dport != pkt->fi6_dport) 1421 return (0); 1422 if (fbmask & FIMB6_SADDR) { 1423 for (i = 0; i < 4; i++) 1424 if (filt->ff_flow6.fi6_src.s6_addr32[i] != 1425 (pkt->fi6_src.s6_addr32[i] & 1426 filt->ff_mask6.mask6_src.s6_addr32[i])) 1427 return (0); 1428 } 1429 if (fbmask & FIMB6_DADDR) { 1430 for (i = 0; i < 4; i++) 1431 if (filt->ff_flow6.fi6_dst.s6_addr32[i] != 1432 (pkt->fi6_dst.s6_addr32[i] & 1433 filt->ff_mask6.mask6_dst.s6_addr32[i])) 1434 return (0); 1435 } 1436 if ((fbmask & FIMB6_TCLASS) && 1437 filt->ff_flow6.fi6_tclass != 1438 (pkt->fi6_tclass & filt->ff_mask6.mask6_tclass)) 1439 return (0); 1440 if ((fbmask & FIMB6_GPI) && 1441 filt->ff_flow6.fi6_gpi != pkt->fi6_gpi) 1442 return (0); 1443 /* match */ 1444 return (1); 1445 } 1446 #endif /* INET6 */ 1447 1448 /* 1449 * filter handle: 1450 * bit 20-28: index to the filter hash table 1451 * bit 0-19: unique id in the hash bucket. 1452 */ 1453 static u_long 1454 get_filt_handle(struct acc_classifier *classifier, int i) 1455 { 1456 static u_long handle_number = 1; 1457 u_long handle; 1458 struct acc_filter *afp; 1459 1460 while (1) { 1461 handle = handle_number++ & 0x000fffff; 1462 1463 if (LIST_EMPTY(&classifier->acc_filters[i])) 1464 break; 1465 1466 LIST_FOREACH(afp, &classifier->acc_filters[i], f_chain) 1467 if ((afp->f_handle & 0x000fffff) == handle) 1468 break; 1469 if (afp == NULL) 1470 break; 1471 /* this handle is already used, try again */ 1472 } 1473 1474 return ((i << 20) | handle); 1475 } 1476 1477 /* convert filter handle to filter pointer */ 1478 static struct acc_filter * 1479 filth_to_filtp(struct acc_classifier *classifier, u_long handle) 1480 { 1481 struct acc_filter *afp; 1482 int i; 1483 1484 i = ACC_GET_HINDEX(handle); 1485 1486 LIST_FOREACH(afp, &classifier->acc_filters[i], f_chain) 1487 if (afp->f_handle == handle) 1488 return (afp); 1489 1490 return (NULL); 1491 } 1492 1493 /* create flowinfo bitmask */ 1494 static u_int32_t 1495 filt2fibmask(struct flow_filter *filt) 1496 { 1497 u_int32_t mask = 0; 1498 #ifdef INET6 1499 struct flow_filter6 *filt6; 1500 #endif 1501 1502 switch (filt->ff_flow.fi_family) { 1503 case AF_INET: 1504 if (filt->ff_flow.fi_proto != 0) 1505 mask |= FIMB4_PROTO; 1506 if (filt->ff_flow.fi_tos != 0) 1507 mask |= FIMB4_TOS; 1508 if (filt->ff_flow.fi_dst.s_addr != 0) 1509 mask |= FIMB4_DADDR; 1510 if (filt->ff_flow.fi_src.s_addr != 0) 1511 mask |= FIMB4_SADDR; 1512 if (filt->ff_flow.fi_sport != 0) 1513 mask |= FIMB4_SPORT; 1514 if (filt->ff_flow.fi_dport != 0) 1515 mask |= FIMB4_DPORT; 1516 if (filt->ff_flow.fi_gpi != 0) 1517 mask |= FIMB4_GPI; 1518 break; 1519 #ifdef INET6 1520 case AF_INET6: 1521 filt6 = (struct flow_filter6 *)filt; 1522 1523 if (filt6->ff_flow6.fi6_proto != 0) 1524 mask |= FIMB6_PROTO; 1525 if (filt6->ff_flow6.fi6_tclass != 0) 1526 mask |= FIMB6_TCLASS; 1527 if (!IN6_IS_ADDR_UNSPECIFIED(&filt6->ff_flow6.fi6_dst)) 1528 mask |= FIMB6_DADDR; 1529 if (!IN6_IS_ADDR_UNSPECIFIED(&filt6->ff_flow6.fi6_src)) 1530 mask |= FIMB6_SADDR; 1531 if (filt6->ff_flow6.fi6_sport != 0) 1532 mask |= FIMB6_SPORT; 1533 if (filt6->ff_flow6.fi6_dport != 0) 1534 mask |= FIMB6_DPORT; 1535 if (filt6->ff_flow6.fi6_gpi != 0) 1536 mask |= FIMB6_GPI; 1537 if (filt6->ff_flow6.fi6_flowlabel != 0) 1538 mask |= FIMB6_FLABEL; 1539 break; 1540 #endif /* INET6 */ 1541 } 1542 return (mask); 1543 } 1544 1545 1546 /* 1547 * helper functions to handle IPv4 fragments. 1548 * currently only in-sequence fragments are handled. 1549 * - fragment info is cached in a LRU list. 1550 * - when a first fragment is found, cache its flow info. 1551 * - when a non-first fragment is found, lookup the cache. 1552 */ 1553 1554 struct ip4_frag { 1555 TAILQ_ENTRY(ip4_frag) ip4f_chain; 1556 char ip4f_valid; 1557 u_short ip4f_id; 1558 struct flowinfo_in ip4f_info; 1559 }; 1560 1561 static TAILQ_HEAD(ip4f_list, ip4_frag) ip4f_list; /* IPv4 fragment cache */ 1562 1563 #define IP4F_TABSIZE 16 /* IPv4 fragment cache size */ 1564 1565 1566 static void 1567 ip4f_cache(struct ip *ip, struct flowinfo_in *fin) 1568 { 1569 struct ip4_frag *fp; 1570 1571 if (TAILQ_EMPTY(&ip4f_list)) { 1572 /* first time call, allocate fragment cache entries. */ 1573 if (ip4f_init() < 0) 1574 /* allocation failed! */ 1575 return; 1576 } 1577 1578 fp = ip4f_alloc(); 1579 fp->ip4f_id = ip->ip_id; 1580 fp->ip4f_info.fi_proto = ip->ip_p; 1581 fp->ip4f_info.fi_src.s_addr = ip->ip_src.s_addr; 1582 fp->ip4f_info.fi_dst.s_addr = ip->ip_dst.s_addr; 1583 1584 /* save port numbers */ 1585 fp->ip4f_info.fi_sport = fin->fi_sport; 1586 fp->ip4f_info.fi_dport = fin->fi_dport; 1587 fp->ip4f_info.fi_gpi = fin->fi_gpi; 1588 } 1589 1590 static int 1591 ip4f_lookup(struct ip *ip, struct flowinfo_in *fin) 1592 { 1593 struct ip4_frag *fp; 1594 1595 for (fp = TAILQ_FIRST(&ip4f_list); fp != NULL && fp->ip4f_valid; 1596 fp = TAILQ_NEXT(fp, ip4f_chain)) 1597 if (ip->ip_id == fp->ip4f_id && 1598 ip->ip_src.s_addr == fp->ip4f_info.fi_src.s_addr && 1599 ip->ip_dst.s_addr == fp->ip4f_info.fi_dst.s_addr && 1600 ip->ip_p == fp->ip4f_info.fi_proto) { 1601 1602 /* found the matching entry */ 1603 fin->fi_sport = fp->ip4f_info.fi_sport; 1604 fin->fi_dport = fp->ip4f_info.fi_dport; 1605 fin->fi_gpi = fp->ip4f_info.fi_gpi; 1606 1607 if ((ntohs(ip->ip_off) & IP_MF) == 0) 1608 /* this is the last fragment, 1609 release the entry. */ 1610 ip4f_free(fp); 1611 1612 return (1); 1613 } 1614 1615 /* no matching entry found */ 1616 return (0); 1617 } 1618 1619 static int 1620 ip4f_init(void) 1621 { 1622 struct ip4_frag *fp; 1623 int i; 1624 1625 TAILQ_INIT(&ip4f_list); 1626 for (i=0; i<IP4F_TABSIZE; i++) { 1627 fp = malloc(sizeof(struct ip4_frag), M_DEVBUF, M_NOWAIT); 1628 if (fp == NULL) { 1629 printf("ip4f_init: can't alloc %dth entry!\n", i); 1630 if (i == 0) 1631 return (-1); 1632 return (0); 1633 } 1634 fp->ip4f_valid = 0; 1635 TAILQ_INSERT_TAIL(&ip4f_list, fp, ip4f_chain); 1636 } 1637 return (0); 1638 } 1639 1640 static struct ip4_frag * 1641 ip4f_alloc(void) 1642 { 1643 struct ip4_frag *fp; 1644 1645 /* reclaim an entry at the tail, put it at the head */ 1646 fp = TAILQ_LAST(&ip4f_list, ip4f_list); 1647 TAILQ_REMOVE(&ip4f_list, fp, ip4f_chain); 1648 fp->ip4f_valid = 1; 1649 TAILQ_INSERT_HEAD(&ip4f_list, fp, ip4f_chain); 1650 return (fp); 1651 } 1652 1653 static void 1654 ip4f_free(struct ip4_frag *fp) 1655 { 1656 TAILQ_REMOVE(&ip4f_list, fp, ip4f_chain); 1657 fp->ip4f_valid = 0; 1658 TAILQ_INSERT_TAIL(&ip4f_list, fp, ip4f_chain); 1659 } 1660 1661 #endif /* ALTQ3_CLFIER_COMPAT */
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