1 /*- 2 * Copyright (c) 2007, Myricom Inc. 3 * Copyright (c) 2008, Intel Corporation. 4 * Copyright (c) 2012 The FreeBSD Foundation 5 * Copyright (c) 2016 Mellanox Technologies. 6 * All rights reserved. 7 * 8 * Portions of this software were developed by Bjoern Zeeb 9 * under sponsorship from the FreeBSD Foundation. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 #include "opt_inet.h" 37 #include "opt_inet6.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/mbuf.h> 42 #include <sys/kernel.h> 43 #include <sys/socket.h> 44 45 #include <net/if.h> 46 #include <net/if_var.h> 47 #include <net/ethernet.h> 48 #include <net/vnet.h> 49 50 #include <netinet/in_systm.h> 51 #include <netinet/in.h> 52 #include <netinet/ip6.h> 53 #include <netinet/ip.h> 54 #include <netinet/ip_var.h> 55 #include <netinet/tcp.h> 56 #include <netinet/tcp_lro.h> 57 58 #include <netinet6/ip6_var.h> 59 60 #include <machine/in_cksum.h> 61 62 static MALLOC_DEFINE(M_LRO, "LRO", "LRO control structures"); 63 64 #define TCP_LRO_UPDATE_CSUM 1 65 #ifndef TCP_LRO_UPDATE_CSUM 66 #define TCP_LRO_INVALID_CSUM 0x0000 67 #endif 68 69 int 70 tcp_lro_init(struct lro_ctrl *lc) 71 { 72 return (tcp_lro_init_args(lc, NULL, TCP_LRO_ENTRIES, 0)); 73 } 74 75 int 76 tcp_lro_init_args(struct lro_ctrl *lc, struct ifnet *ifp, 77 unsigned lro_entries, unsigned lro_mbufs) 78 { 79 struct lro_entry *le; 80 size_t size; 81 unsigned i; 82 83 lc->lro_bad_csum = 0; 84 lc->lro_queued = 0; 85 lc->lro_flushed = 0; 86 lc->lro_cnt = 0; 87 lc->lro_mbuf_count = 0; 88 lc->lro_mbuf_max = lro_mbufs; 89 lc->lro_cnt = lro_entries; 90 lc->ifp = ifp; 91 SLIST_INIT(&lc->lro_free); 92 SLIST_INIT(&lc->lro_active); 93 94 /* compute size to allocate */ 95 size = (lro_mbufs * sizeof(struct mbuf *)) + 96 (lro_entries * sizeof(*le)); 97 lc->lro_mbuf_data = (struct mbuf **) 98 malloc(size, M_LRO, M_NOWAIT | M_ZERO); 99 100 /* check for out of memory */ 101 if (lc->lro_mbuf_data == NULL) { 102 memset(lc, 0, sizeof(*lc)); 103 return (ENOMEM); 104 } 105 /* compute offset for LRO entries */ 106 le = (struct lro_entry *) 107 (lc->lro_mbuf_data + lro_mbufs); 108 109 /* setup linked list */ 110 for (i = 0; i != lro_entries; i++) 111 SLIST_INSERT_HEAD(&lc->lro_free, le + i, next); 112 113 return (0); 114 } 115 116 void 117 tcp_lro_free(struct lro_ctrl *lc) 118 { 119 struct lro_entry *le; 120 unsigned x; 121 122 /* reset LRO free list */ 123 SLIST_INIT(&lc->lro_free); 124 125 /* free active mbufs, if any */ 126 while ((le = SLIST_FIRST(&lc->lro_active)) != NULL) { 127 SLIST_REMOVE_HEAD(&lc->lro_active, next); 128 m_freem(le->m_head); 129 } 130 131 /* free mbuf array, if any */ 132 for (x = 0; x != lc->lro_mbuf_count; x++) 133 m_freem(lc->lro_mbuf_data[x]); 134 lc->lro_mbuf_count = 0; 135 136 /* free allocated memory, if any */ 137 free(lc->lro_mbuf_data, M_LRO); 138 lc->lro_mbuf_data = NULL; 139 } 140 141 #ifdef TCP_LRO_UPDATE_CSUM 142 static uint16_t 143 tcp_lro_csum_th(struct tcphdr *th) 144 { 145 uint32_t ch; 146 uint16_t *p, l; 147 148 ch = th->th_sum = 0x0000; 149 l = th->th_off; 150 p = (uint16_t *)th; 151 while (l > 0) { 152 ch += *p; 153 p++; 154 ch += *p; 155 p++; 156 l--; 157 } 158 while (ch > 0xffff) 159 ch = (ch >> 16) + (ch & 0xffff); 160 161 return (ch & 0xffff); 162 } 163 164 static uint16_t 165 tcp_lro_rx_csum_fixup(struct lro_entry *le, void *l3hdr, struct tcphdr *th, 166 uint16_t tcp_data_len, uint16_t csum) 167 { 168 uint32_t c; 169 uint16_t cs; 170 171 c = csum; 172 173 /* Remove length from checksum. */ 174 switch (le->eh_type) { 175 #ifdef INET6 176 case ETHERTYPE_IPV6: 177 { 178 struct ip6_hdr *ip6; 179 180 ip6 = (struct ip6_hdr *)l3hdr; 181 if (le->append_cnt == 0) 182 cs = ip6->ip6_plen; 183 else { 184 uint32_t cx; 185 186 cx = ntohs(ip6->ip6_plen); 187 cs = in6_cksum_pseudo(ip6, cx, ip6->ip6_nxt, 0); 188 } 189 break; 190 } 191 #endif 192 #ifdef INET 193 case ETHERTYPE_IP: 194 { 195 struct ip *ip4; 196 197 ip4 = (struct ip *)l3hdr; 198 if (le->append_cnt == 0) 199 cs = ip4->ip_len; 200 else { 201 cs = in_addword(ntohs(ip4->ip_len) - sizeof(*ip4), 202 IPPROTO_TCP); 203 cs = in_pseudo(ip4->ip_src.s_addr, ip4->ip_dst.s_addr, 204 htons(cs)); 205 } 206 break; 207 } 208 #endif 209 default: 210 cs = 0; /* Keep compiler happy. */ 211 } 212 213 cs = ~cs; 214 c += cs; 215 216 /* Remove TCP header csum. */ 217 cs = ~tcp_lro_csum_th(th); 218 c += cs; 219 while (c > 0xffff) 220 c = (c >> 16) + (c & 0xffff); 221 222 return (c & 0xffff); 223 } 224 #endif 225 226 void 227 tcp_lro_flush_inactive(struct lro_ctrl *lc, const struct timeval *timeout) 228 { 229 struct lro_entry *le, *le_tmp; 230 struct timeval tv; 231 232 if (SLIST_EMPTY(&lc->lro_active)) 233 return; 234 235 getmicrotime(&tv); 236 timevalsub(&tv, timeout); 237 SLIST_FOREACH_SAFE(le, &lc->lro_active, next, le_tmp) { 238 if (timevalcmp(&tv, &le->mtime, >=)) { 239 SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); 240 tcp_lro_flush(lc, le); 241 } 242 } 243 } 244 245 void 246 tcp_lro_flush(struct lro_ctrl *lc, struct lro_entry *le) 247 { 248 249 if (le->append_cnt > 0) { 250 struct tcphdr *th; 251 uint16_t p_len; 252 253 p_len = htons(le->p_len); 254 switch (le->eh_type) { 255 #ifdef INET6 256 case ETHERTYPE_IPV6: 257 { 258 struct ip6_hdr *ip6; 259 260 ip6 = le->le_ip6; 261 ip6->ip6_plen = p_len; 262 th = (struct tcphdr *)(ip6 + 1); 263 le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID | 264 CSUM_PSEUDO_HDR; 265 le->p_len += ETHER_HDR_LEN + sizeof(*ip6); 266 break; 267 } 268 #endif 269 #ifdef INET 270 case ETHERTYPE_IP: 271 { 272 struct ip *ip4; 273 #ifdef TCP_LRO_UPDATE_CSUM 274 uint32_t cl; 275 uint16_t c; 276 #endif 277 278 ip4 = le->le_ip4; 279 #ifdef TCP_LRO_UPDATE_CSUM 280 /* Fix IP header checksum for new length. */ 281 c = ~ip4->ip_sum; 282 cl = c; 283 c = ~ip4->ip_len; 284 cl += c + p_len; 285 while (cl > 0xffff) 286 cl = (cl >> 16) + (cl & 0xffff); 287 c = cl; 288 ip4->ip_sum = ~c; 289 #else 290 ip4->ip_sum = TCP_LRO_INVALID_CSUM; 291 #endif 292 ip4->ip_len = p_len; 293 th = (struct tcphdr *)(ip4 + 1); 294 le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID | 295 CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID; 296 le->p_len += ETHER_HDR_LEN; 297 break; 298 } 299 #endif 300 default: 301 th = NULL; /* Keep compiler happy. */ 302 } 303 le->m_head->m_pkthdr.csum_data = 0xffff; 304 le->m_head->m_pkthdr.len = le->p_len; 305 306 /* Incorporate the latest ACK into the TCP header. */ 307 th->th_ack = le->ack_seq; 308 th->th_win = le->window; 309 /* Incorporate latest timestamp into the TCP header. */ 310 if (le->timestamp != 0) { 311 uint32_t *ts_ptr; 312 313 ts_ptr = (uint32_t *)(th + 1); 314 ts_ptr[1] = htonl(le->tsval); 315 ts_ptr[2] = le->tsecr; 316 } 317 #ifdef TCP_LRO_UPDATE_CSUM 318 /* Update the TCP header checksum. */ 319 le->ulp_csum += p_len; 320 le->ulp_csum += tcp_lro_csum_th(th); 321 while (le->ulp_csum > 0xffff) 322 le->ulp_csum = (le->ulp_csum >> 16) + 323 (le->ulp_csum & 0xffff); 324 th->th_sum = (le->ulp_csum & 0xffff); 325 th->th_sum = ~th->th_sum; 326 #else 327 th->th_sum = TCP_LRO_INVALID_CSUM; 328 #endif 329 } 330 331 (*lc->ifp->if_input)(lc->ifp, le->m_head); 332 lc->lro_queued += le->append_cnt + 1; 333 lc->lro_flushed++; 334 bzero(le, sizeof(*le)); 335 SLIST_INSERT_HEAD(&lc->lro_free, le, next); 336 } 337 338 static int 339 tcp_lro_mbuf_compare_header(const void *ppa, const void *ppb) 340 { 341 const struct mbuf *ma = *((const struct mbuf * const *)ppa); 342 const struct mbuf *mb = *((const struct mbuf * const *)ppb); 343 int ret; 344 345 ret = M_HASHTYPE_GET(ma) - M_HASHTYPE_GET(mb); 346 if (ret != 0) 347 goto done; 348 349 ret = ma->m_pkthdr.flowid - mb->m_pkthdr.flowid; 350 if (ret != 0) 351 goto done; 352 353 ret = TCP_LRO_SEQUENCE(ma) - TCP_LRO_SEQUENCE(mb); 354 done: 355 return (ret); 356 } 357 358 void 359 tcp_lro_flush_all(struct lro_ctrl *lc) 360 { 361 struct lro_entry *le; 362 uint32_t hashtype; 363 uint32_t flowid; 364 unsigned x; 365 366 /* check if no mbufs to flush */ 367 if (__predict_false(lc->lro_mbuf_count == 0)) 368 goto done; 369 370 /* sort all mbufs according to stream */ 371 qsort(lc->lro_mbuf_data, lc->lro_mbuf_count, sizeof(struct mbuf *), 372 &tcp_lro_mbuf_compare_header); 373 374 /* input data into LRO engine, stream by stream */ 375 flowid = 0; 376 hashtype = M_HASHTYPE_NONE; 377 for (x = 0; x != lc->lro_mbuf_count; x++) { 378 struct mbuf *mb; 379 380 mb = lc->lro_mbuf_data[x]; 381 382 /* check for new stream */ 383 if (mb->m_pkthdr.flowid != flowid || 384 M_HASHTYPE_GET(mb) != hashtype) { 385 flowid = mb->m_pkthdr.flowid; 386 hashtype = M_HASHTYPE_GET(mb); 387 388 /* flush active streams */ 389 while ((le = SLIST_FIRST(&lc->lro_active)) != NULL) { 390 SLIST_REMOVE_HEAD(&lc->lro_active, next); 391 tcp_lro_flush(lc, le); 392 } 393 } 394 #ifdef TCP_LRO_RESET_SEQUENCE 395 /* reset sequence number */ 396 TCP_LRO_SEQUENCE(mb) = 0; 397 #endif 398 /* add packet to LRO engine */ 399 if (tcp_lro_rx(lc, mb, 0) != 0) { 400 /* input packet to network layer */ 401 (*lc->ifp->if_input)(lc->ifp, mb); 402 lc->lro_queued++; 403 lc->lro_flushed++; 404 } 405 } 406 done: 407 /* flush active streams */ 408 while ((le = SLIST_FIRST(&lc->lro_active)) != NULL) { 409 SLIST_REMOVE_HEAD(&lc->lro_active, next); 410 tcp_lro_flush(lc, le); 411 } 412 lc->lro_mbuf_count = 0; 413 } 414 415 #ifdef INET6 416 static int 417 tcp_lro_rx_ipv6(struct lro_ctrl *lc, struct mbuf *m, struct ip6_hdr *ip6, 418 struct tcphdr **th) 419 { 420 421 /* XXX-BZ we should check the flow-label. */ 422 423 /* XXX-BZ We do not yet support ext. hdrs. */ 424 if (ip6->ip6_nxt != IPPROTO_TCP) 425 return (TCP_LRO_NOT_SUPPORTED); 426 427 /* Find the TCP header. */ 428 *th = (struct tcphdr *)(ip6 + 1); 429 430 return (0); 431 } 432 #endif 433 434 #ifdef INET 435 static int 436 tcp_lro_rx_ipv4(struct lro_ctrl *lc, struct mbuf *m, struct ip *ip4, 437 struct tcphdr **th) 438 { 439 int csum_flags; 440 uint16_t csum; 441 442 if (ip4->ip_p != IPPROTO_TCP) 443 return (TCP_LRO_NOT_SUPPORTED); 444 445 /* Ensure there are no options. */ 446 if ((ip4->ip_hl << 2) != sizeof (*ip4)) 447 return (TCP_LRO_CANNOT); 448 449 /* .. and the packet is not fragmented. */ 450 if (ip4->ip_off & htons(IP_MF|IP_OFFMASK)) 451 return (TCP_LRO_CANNOT); 452 453 /* Legacy IP has a header checksum that needs to be correct. */ 454 csum_flags = m->m_pkthdr.csum_flags; 455 if (csum_flags & CSUM_IP_CHECKED) { 456 if (__predict_false((csum_flags & CSUM_IP_VALID) == 0)) { 457 lc->lro_bad_csum++; 458 return (TCP_LRO_CANNOT); 459 } 460 } else { 461 csum = in_cksum_hdr(ip4); 462 if (__predict_false((csum) != 0)) { 463 lc->lro_bad_csum++; 464 return (TCP_LRO_CANNOT); 465 } 466 } 467 468 /* Find the TCP header (we assured there are no IP options). */ 469 *th = (struct tcphdr *)(ip4 + 1); 470 471 return (0); 472 } 473 #endif 474 475 int 476 tcp_lro_rx(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum) 477 { 478 struct lro_entry *le; 479 struct ether_header *eh; 480 #ifdef INET6 481 struct ip6_hdr *ip6 = NULL; /* Keep compiler happy. */ 482 #endif 483 #ifdef INET 484 struct ip *ip4 = NULL; /* Keep compiler happy. */ 485 #endif 486 struct tcphdr *th; 487 void *l3hdr = NULL; /* Keep compiler happy. */ 488 uint32_t *ts_ptr; 489 tcp_seq seq; 490 int error, ip_len, l; 491 uint16_t eh_type, tcp_data_len; 492 493 /* We expect a contiguous header [eh, ip, tcp]. */ 494 495 eh = mtod(m, struct ether_header *); 496 eh_type = ntohs(eh->ether_type); 497 switch (eh_type) { 498 #ifdef INET6 499 case ETHERTYPE_IPV6: 500 { 501 CURVNET_SET(lc->ifp->if_vnet); 502 if (V_ip6_forwarding != 0) { 503 /* XXX-BZ stats but changing lro_ctrl is a problem. */ 504 CURVNET_RESTORE(); 505 return (TCP_LRO_CANNOT); 506 } 507 CURVNET_RESTORE(); 508 l3hdr = ip6 = (struct ip6_hdr *)(eh + 1); 509 error = tcp_lro_rx_ipv6(lc, m, ip6, &th); 510 if (error != 0) 511 return (error); 512 tcp_data_len = ntohs(ip6->ip6_plen); 513 ip_len = sizeof(*ip6) + tcp_data_len; 514 break; 515 } 516 #endif 517 #ifdef INET 518 case ETHERTYPE_IP: 519 { 520 CURVNET_SET(lc->ifp->if_vnet); 521 if (V_ipforwarding != 0) { 522 /* XXX-BZ stats but changing lro_ctrl is a problem. */ 523 CURVNET_RESTORE(); 524 return (TCP_LRO_CANNOT); 525 } 526 CURVNET_RESTORE(); 527 l3hdr = ip4 = (struct ip *)(eh + 1); 528 error = tcp_lro_rx_ipv4(lc, m, ip4, &th); 529 if (error != 0) 530 return (error); 531 ip_len = ntohs(ip4->ip_len); 532 tcp_data_len = ip_len - sizeof(*ip4); 533 break; 534 } 535 #endif 536 /* XXX-BZ what happens in case of VLAN(s)? */ 537 default: 538 return (TCP_LRO_NOT_SUPPORTED); 539 } 540 541 /* 542 * If the frame is padded beyond the end of the IP packet, then we must 543 * trim the extra bytes off. 544 */ 545 l = m->m_pkthdr.len - (ETHER_HDR_LEN + ip_len); 546 if (l != 0) { 547 if (l < 0) 548 /* Truncated packet. */ 549 return (TCP_LRO_CANNOT); 550 551 m_adj(m, -l); 552 } 553 554 /* 555 * Check TCP header constraints. 556 */ 557 /* Ensure no bits set besides ACK or PSH. */ 558 if ((th->th_flags & ~(TH_ACK | TH_PUSH)) != 0) 559 return (TCP_LRO_CANNOT); 560 561 /* XXX-BZ We lose a AKC|PUSH flag concatinating multiple segments. */ 562 /* XXX-BZ Ideally we'd flush on PUSH? */ 563 564 /* 565 * Check for timestamps. 566 * Since the only option we handle are timestamps, we only have to 567 * handle the simple case of aligned timestamps. 568 */ 569 l = (th->th_off << 2); 570 tcp_data_len -= l; 571 l -= sizeof(*th); 572 ts_ptr = (uint32_t *)(th + 1); 573 if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) || 574 (*ts_ptr != ntohl(TCPOPT_NOP<<24|TCPOPT_NOP<<16| 575 TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP)))) 576 return (TCP_LRO_CANNOT); 577 578 /* If the driver did not pass in the checksum, set it now. */ 579 if (csum == 0x0000) 580 csum = th->th_sum; 581 582 seq = ntohl(th->th_seq); 583 584 /* Try to find a matching previous segment. */ 585 SLIST_FOREACH(le, &lc->lro_active, next) { 586 if (le->eh_type != eh_type) 587 continue; 588 if (le->source_port != th->th_sport || 589 le->dest_port != th->th_dport) 590 continue; 591 switch (eh_type) { 592 #ifdef INET6 593 case ETHERTYPE_IPV6: 594 if (bcmp(&le->source_ip6, &ip6->ip6_src, 595 sizeof(struct in6_addr)) != 0 || 596 bcmp(&le->dest_ip6, &ip6->ip6_dst, 597 sizeof(struct in6_addr)) != 0) 598 continue; 599 break; 600 #endif 601 #ifdef INET 602 case ETHERTYPE_IP: 603 if (le->source_ip4 != ip4->ip_src.s_addr || 604 le->dest_ip4 != ip4->ip_dst.s_addr) 605 continue; 606 break; 607 #endif 608 } 609 610 /* Flush now if appending will result in overflow. */ 611 if (le->p_len > (65535 - tcp_data_len)) { 612 SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); 613 tcp_lro_flush(lc, le); 614 break; 615 } 616 617 /* Try to append the new segment. */ 618 if (__predict_false(seq != le->next_seq || 619 (tcp_data_len == 0 && le->ack_seq == th->th_ack))) { 620 /* Out of order packet or duplicate ACK. */ 621 SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); 622 tcp_lro_flush(lc, le); 623 return (TCP_LRO_CANNOT); 624 } 625 626 if (l != 0) { 627 uint32_t tsval = ntohl(*(ts_ptr + 1)); 628 /* Make sure timestamp values are increasing. */ 629 /* XXX-BZ flip and use TSTMP_GEQ macro for this? */ 630 if (__predict_false(le->tsval > tsval || 631 *(ts_ptr + 2) == 0)) 632 return (TCP_LRO_CANNOT); 633 le->tsval = tsval; 634 le->tsecr = *(ts_ptr + 2); 635 } 636 637 le->next_seq += tcp_data_len; 638 le->ack_seq = th->th_ack; 639 le->window = th->th_win; 640 le->append_cnt++; 641 642 #ifdef TCP_LRO_UPDATE_CSUM 643 le->ulp_csum += tcp_lro_rx_csum_fixup(le, l3hdr, th, 644 tcp_data_len, ~csum); 645 #endif 646 647 if (tcp_data_len == 0) { 648 m_freem(m); 649 return (0); 650 } 651 652 le->p_len += tcp_data_len; 653 654 /* 655 * Adjust the mbuf so that m_data points to the first byte of 656 * the ULP payload. Adjust the mbuf to avoid complications and 657 * append new segment to existing mbuf chain. 658 */ 659 m_adj(m, m->m_pkthdr.len - tcp_data_len); 660 m_demote_pkthdr(m); 661 662 le->m_tail->m_next = m; 663 le->m_tail = m_last(m); 664 665 /* 666 * If a possible next full length packet would cause an 667 * overflow, pro-actively flush now. 668 */ 669 if (le->p_len > (65535 - lc->ifp->if_mtu)) { 670 SLIST_REMOVE(&lc->lro_active, le, lro_entry, next); 671 tcp_lro_flush(lc, le); 672 } else 673 getmicrotime(&le->mtime); 674 675 return (0); 676 } 677 678 /* Try to find an empty slot. */ 679 if (SLIST_EMPTY(&lc->lro_free)) 680 return (TCP_LRO_CANNOT); 681 682 /* Start a new segment chain. */ 683 le = SLIST_FIRST(&lc->lro_free); 684 SLIST_REMOVE_HEAD(&lc->lro_free, next); 685 SLIST_INSERT_HEAD(&lc->lro_active, le, next); 686 getmicrotime(&le->mtime); 687 688 /* Start filling in details. */ 689 switch (eh_type) { 690 #ifdef INET6 691 case ETHERTYPE_IPV6: 692 le->le_ip6 = ip6; 693 le->source_ip6 = ip6->ip6_src; 694 le->dest_ip6 = ip6->ip6_dst; 695 le->eh_type = eh_type; 696 le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN - sizeof(*ip6); 697 break; 698 #endif 699 #ifdef INET 700 case ETHERTYPE_IP: 701 le->le_ip4 = ip4; 702 le->source_ip4 = ip4->ip_src.s_addr; 703 le->dest_ip4 = ip4->ip_dst.s_addr; 704 le->eh_type = eh_type; 705 le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN; 706 break; 707 #endif 708 } 709 le->source_port = th->th_sport; 710 le->dest_port = th->th_dport; 711 712 le->next_seq = seq + tcp_data_len; 713 le->ack_seq = th->th_ack; 714 le->window = th->th_win; 715 if (l != 0) { 716 le->timestamp = 1; 717 le->tsval = ntohl(*(ts_ptr + 1)); 718 le->tsecr = *(ts_ptr + 2); 719 } 720 721 #ifdef TCP_LRO_UPDATE_CSUM 722 /* 723 * Do not touch the csum of the first packet. However save the 724 * "adjusted" checksum of just the source and destination addresses, 725 * the next header and the TCP payload. The length and TCP header 726 * parts may change, so we remove those from the saved checksum and 727 * re-add with final values on tcp_lro_flush() if needed. 728 */ 729 KASSERT(le->ulp_csum == 0, ("%s: le=%p le->ulp_csum=0x%04x\n", 730 __func__, le, le->ulp_csum)); 731 732 le->ulp_csum = tcp_lro_rx_csum_fixup(le, l3hdr, th, tcp_data_len, 733 ~csum); 734 th->th_sum = csum; /* Restore checksum on first packet. */ 735 #endif 736 737 le->m_head = m; 738 le->m_tail = m_last(m); 739 740 return (0); 741 } 742 743 void 744 tcp_lro_queue_mbuf(struct lro_ctrl *lc, struct mbuf *mb) 745 { 746 /* sanity checks */ 747 if (__predict_false(lc->ifp == NULL || lc->lro_mbuf_data == NULL || 748 lc->lro_mbuf_max == 0)) { 749 /* packet drop */ 750 m_freem(mb); 751 return; 752 } 753 754 /* check if packet is not LRO capable */ 755 if (__predict_false(mb->m_pkthdr.csum_flags == 0 || 756 (lc->ifp->if_capenable & IFCAP_LRO) == 0)) { 757 lc->lro_flushed++; 758 lc->lro_queued++; 759 760 /* input packet to network layer */ 761 (*lc->ifp->if_input) (lc->ifp, mb); 762 return; 763 } 764 765 /* check if array is full */ 766 if (__predict_false(lc->lro_mbuf_count == lc->lro_mbuf_max)) 767 tcp_lro_flush_all(lc); 768 769 /* store sequence number */ 770 TCP_LRO_SEQUENCE(mb) = lc->lro_mbuf_count; 771 772 /* enter mbuf */ 773 lc->lro_mbuf_data[lc->lro_mbuf_count++] = mb; 774 } 775 776 /* end */ 777