1/*- 2 * SPDX-License-Identifier: BSD-2-Clause 3 * 4 * Copyright (c) 2007, Myricom Inc. 5 * Copyright (c) 2008, Intel Corporation. 6 * Copyright (c) 2012 The FreeBSD Foundation 7 * Copyright (c) 2016-2021 Mellanox Technologies. 8 * All rights reserved. 9 * 10 * Portions of this software were developed by Bjoern Zeeb 11 * under sponsorship from the FreeBSD Foundation. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#include <sys/cdefs.h> 36#include "opt_inet.h" 37#include "opt_inet6.h" 38 39#include <sys/param.h> 40#include <sys/systm.h> 41#include <sys/kernel.h> 42#include <sys/malloc.h> 43#include <sys/mbuf.h> 44#include <sys/socket.h> 45#include <sys/socketvar.h> 46#include <sys/sockbuf.h> 47#include <sys/sysctl.h> 48 49#include <net/if.h> 50#include <net/if_var.h> 51#include <net/ethernet.h> 52#include <net/bpf.h> 53#include <net/vnet.h> 54#include <net/if_dl.h> 55#include <net/if_media.h> 56#include <net/if_private.h> 57#include <net/if_types.h> 58#include <net/infiniband.h> 59#include <net/if_lagg.h> 60 61#include <netinet/in_systm.h> 62#include <netinet/in.h> 63#include <netinet/ip6.h> 64#include <netinet/ip.h> 65#include <netinet/ip_var.h> 66#include <netinet/in_pcb.h> 67#include <netinet6/in6_pcb.h> 68#include <netinet/tcp.h> 69#include <netinet/tcp_seq.h> 70#include <netinet/tcp_lro.h> 71#include <netinet/tcp_var.h> 72#include <netinet/tcpip.h> 73#include <netinet/tcp_hpts.h> 74#include <netinet/tcp_log_buf.h> 75#include <netinet/tcp_fsm.h> 76#include <netinet/udp.h> 77#include <netinet6/ip6_var.h> 78 79#include <machine/in_cksum.h> 80 81static MALLOC_DEFINE(M_LRO, "LRO", "LRO control structures"); 82 83static void tcp_lro_rx_done(struct lro_ctrl *lc); 84static int tcp_lro_rx_common(struct lro_ctrl *lc, struct mbuf *m, 85 uint32_t csum, bool use_hash); 86 87SYSCTL_NODE(_net_inet_tcp, OID_AUTO, lro, CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 88 "TCP LRO"); 89 90long tcplro_stacks_wanting_mbufq; 91int (*tcp_lro_flush_tcphpts)(struct lro_ctrl *lc, struct lro_entry *le); 92 93counter_u64_t tcp_inp_lro_direct_queue; 94counter_u64_t tcp_inp_lro_wokeup_queue; 95counter_u64_t tcp_inp_lro_compressed; 96counter_u64_t tcp_inp_lro_locks_taken; 97counter_u64_t tcp_extra_mbuf; 98counter_u64_t tcp_would_have_but; 99counter_u64_t tcp_comp_total; 100counter_u64_t tcp_uncomp_total; 101counter_u64_t tcp_bad_csums; 102 103static unsigned tcp_lro_entries = TCP_LRO_ENTRIES; 104SYSCTL_UINT(_net_inet_tcp_lro, OID_AUTO, entries, 105 CTLFLAG_RDTUN | CTLFLAG_MPSAFE, &tcp_lro_entries, 0, 106 "default number of LRO entries"); 107 108static uint32_t tcp_lro_cpu_set_thresh = TCP_LRO_CPU_DECLARATION_THRESH; 109SYSCTL_UINT(_net_inet_tcp_lro, OID_AUTO, lro_cpu_threshold, 110 CTLFLAG_RDTUN | CTLFLAG_MPSAFE, &tcp_lro_cpu_set_thresh, 0, 111 "Number of interrupts in a row on the same CPU that will make us declare an 'affinity' cpu?"); 112 113static uint32_t tcp_less_accurate_lro_ts = 0; 114SYSCTL_UINT(_net_inet_tcp_lro, OID_AUTO, lro_less_accurate, 115 CTLFLAG_MPSAFE, &tcp_less_accurate_lro_ts, 0, 116 "Do we trade off efficency by doing less timestamp operations for time accuracy?"); 117 118SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, fullqueue, CTLFLAG_RD, 119 &tcp_inp_lro_direct_queue, "Number of lro's fully queued to transport"); 120SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, wokeup, CTLFLAG_RD, 121 &tcp_inp_lro_wokeup_queue, "Number of lro's where we woke up transport via hpts"); 122SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, compressed, CTLFLAG_RD, 123 &tcp_inp_lro_compressed, "Number of lro's compressed and sent to transport"); 124SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, lockcnt, CTLFLAG_RD, 125 &tcp_inp_lro_locks_taken, "Number of lro's inp_wlocks taken"); 126SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, extra_mbuf, CTLFLAG_RD, 127 &tcp_extra_mbuf, "Number of times we had an extra compressed ack dropped into the tp"); 128SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, would_have_but, CTLFLAG_RD, 129 &tcp_would_have_but, "Number of times we would have had an extra compressed, but mget failed"); 130SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, with_m_ackcmp, CTLFLAG_RD, 131 &tcp_comp_total, "Number of mbufs queued with M_ACKCMP flags set"); 132SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, without_m_ackcmp, CTLFLAG_RD, 133 &tcp_uncomp_total, "Number of mbufs queued without M_ACKCMP"); 134SYSCTL_COUNTER_U64(_net_inet_tcp_lro, OID_AUTO, lro_badcsum, CTLFLAG_RD, 135 &tcp_bad_csums, "Number of packets that the common code saw with bad csums"); 136 137void 138tcp_lro_reg_mbufq(void) 139{ 140 atomic_fetchadd_long(&tcplro_stacks_wanting_mbufq, 1); 141} 142 143void 144tcp_lro_dereg_mbufq(void) 145{ 146 atomic_fetchadd_long(&tcplro_stacks_wanting_mbufq, -1); 147} 148 149static __inline void 150tcp_lro_active_insert(struct lro_ctrl *lc, struct lro_head *bucket, 151 struct lro_entry *le) 152{ 153 154 LIST_INSERT_HEAD(&lc->lro_active, le, next); 155 LIST_INSERT_HEAD(bucket, le, hash_next); 156} 157 158static __inline void 159tcp_lro_active_remove(struct lro_entry *le) 160{ 161 162 LIST_REMOVE(le, next); /* active list */ 163 LIST_REMOVE(le, hash_next); /* hash bucket */ 164} 165 166int 167tcp_lro_init(struct lro_ctrl *lc) 168{ 169 return (tcp_lro_init_args(lc, NULL, tcp_lro_entries, 0)); 170} 171 172int 173tcp_lro_init_args(struct lro_ctrl *lc, struct ifnet *ifp, 174 unsigned lro_entries, unsigned lro_mbufs) 175{ 176 struct lro_entry *le; 177 size_t size; 178 unsigned i, elements; 179 180 lc->lro_bad_csum = 0; 181 lc->lro_queued = 0; 182 lc->lro_flushed = 0; 183 lc->lro_mbuf_count = 0; 184 lc->lro_mbuf_max = lro_mbufs; 185 lc->lro_cnt = lro_entries; 186 lc->lro_ackcnt_lim = TCP_LRO_ACKCNT_MAX; 187 lc->lro_length_lim = TCP_LRO_LENGTH_MAX; 188 lc->ifp = ifp; 189 LIST_INIT(&lc->lro_free); 190 LIST_INIT(&lc->lro_active); 191 192 /* create hash table to accelerate entry lookup */ 193 if (lro_entries > lro_mbufs) 194 elements = lro_entries; 195 else 196 elements = lro_mbufs; 197 lc->lro_hash = phashinit_flags(elements, M_LRO, &lc->lro_hashsz, 198 HASH_NOWAIT); 199 if (lc->lro_hash == NULL) { 200 memset(lc, 0, sizeof(*lc)); 201 return (ENOMEM); 202 } 203 204 /* compute size to allocate */ 205 size = (lro_mbufs * sizeof(struct lro_mbuf_sort)) + 206 (lro_entries * sizeof(*le)); 207 lc->lro_mbuf_data = (struct lro_mbuf_sort *) 208 malloc(size, M_LRO, M_NOWAIT | M_ZERO); 209 210 /* check for out of memory */ 211 if (lc->lro_mbuf_data == NULL) { 212 free(lc->lro_hash, M_LRO); 213 memset(lc, 0, sizeof(*lc)); 214 return (ENOMEM); 215 } 216 /* compute offset for LRO entries */ 217 le = (struct lro_entry *) 218 (lc->lro_mbuf_data + lro_mbufs); 219 220 /* setup linked list */ 221 for (i = 0; i != lro_entries; i++) 222 LIST_INSERT_HEAD(&lc->lro_free, le + i, next); 223 224 return (0); 225} 226 227struct vxlan_header { 228 uint32_t vxlh_flags; 229 uint32_t vxlh_vni; 230}; 231 232static inline void * 233tcp_lro_low_level_parser(void *ptr, struct lro_parser *parser, bool update_data, bool is_vxlan, int mlen) 234{ 235 const struct ether_vlan_header *eh; 236 void *old; 237 uint16_t eth_type; 238 239 if (update_data) 240 memset(parser, 0, sizeof(*parser)); 241 242 old = ptr; 243 244 if (is_vxlan) { 245 const struct vxlan_header *vxh; 246 vxh = ptr; 247 ptr = (uint8_t *)ptr + sizeof(*vxh); 248 if (update_data) { 249 parser->data.vxlan_vni = 250 vxh->vxlh_vni & htonl(0xffffff00); 251 } 252 } 253 254 eh = ptr; 255 if (__predict_false(eh->evl_encap_proto == htons(ETHERTYPE_VLAN))) { 256 eth_type = eh->evl_proto; 257 if (update_data) { 258 /* strip priority and keep VLAN ID only */ 259 parser->data.vlan_id = eh->evl_tag & htons(EVL_VLID_MASK); 260 } 261 /* advance to next header */ 262 ptr = (uint8_t *)ptr + ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN; 263 mlen -= (ETHER_HDR_LEN + ETHER_VLAN_ENCAP_LEN); 264 } else { 265 eth_type = eh->evl_encap_proto; 266 /* advance to next header */ 267 mlen -= ETHER_HDR_LEN; 268 ptr = (uint8_t *)ptr + ETHER_HDR_LEN; 269 } 270 if (__predict_false(mlen <= 0)) 271 return (NULL); 272 switch (eth_type) { 273#ifdef INET 274 case htons(ETHERTYPE_IP): 275 parser->ip4 = ptr; 276 if (__predict_false(mlen < sizeof(struct ip))) 277 return (NULL); 278 /* Ensure there are no IPv4 options. */ 279 if ((parser->ip4->ip_hl << 2) != sizeof (*parser->ip4)) 280 break; 281 /* .. and the packet is not fragmented. */ 282 if (parser->ip4->ip_off & htons(IP_MF|IP_OFFMASK)) 283 break; 284 /* .. and the packet has valid src/dst addrs */ 285 if (__predict_false(parser->ip4->ip_src.s_addr == INADDR_ANY || 286 parser->ip4->ip_dst.s_addr == INADDR_ANY)) 287 break; 288 ptr = (uint8_t *)ptr + (parser->ip4->ip_hl << 2); 289 mlen -= sizeof(struct ip); 290 if (update_data) { 291 parser->data.s_addr.v4 = parser->ip4->ip_src; 292 parser->data.d_addr.v4 = parser->ip4->ip_dst; 293 } 294 switch (parser->ip4->ip_p) { 295 case IPPROTO_UDP: 296 if (__predict_false(mlen < sizeof(struct udphdr))) 297 return (NULL); 298 parser->udp = ptr; 299 if (update_data) { 300 parser->data.lro_type = LRO_TYPE_IPV4_UDP; 301 parser->data.s_port = parser->udp->uh_sport; 302 parser->data.d_port = parser->udp->uh_dport; 303 } else { 304 MPASS(parser->data.lro_type == LRO_TYPE_IPV4_UDP); 305 } 306 ptr = ((uint8_t *)ptr + sizeof(*parser->udp)); 307 parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old; 308 return (ptr); 309 case IPPROTO_TCP: 310 parser->tcp = ptr; 311 if (__predict_false(mlen < sizeof(struct tcphdr))) 312 return (NULL); 313 if (update_data) { 314 parser->data.lro_type = LRO_TYPE_IPV4_TCP; 315 parser->data.s_port = parser->tcp->th_sport; 316 parser->data.d_port = parser->tcp->th_dport; 317 } else { 318 MPASS(parser->data.lro_type == LRO_TYPE_IPV4_TCP); 319 } 320 if (__predict_false(mlen < (parser->tcp->th_off << 2))) 321 return (NULL); 322 ptr = (uint8_t *)ptr + (parser->tcp->th_off << 2); 323 parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old; 324 return (ptr); 325 default: 326 break; 327 } 328 break; 329#endif 330#ifdef INET6 331 case htons(ETHERTYPE_IPV6): 332 parser->ip6 = ptr; 333 if (__predict_false(mlen < sizeof(struct ip6_hdr))) 334 return (NULL); 335 /* Ensure the packet has valid src/dst addrs */ 336 if (__predict_false(IN6_IS_ADDR_UNSPECIFIED(&parser->ip6->ip6_src) || 337 IN6_IS_ADDR_UNSPECIFIED(&parser->ip6->ip6_dst))) 338 return (NULL); 339 ptr = (uint8_t *)ptr + sizeof(*parser->ip6); 340 if (update_data) { 341 parser->data.s_addr.v6 = parser->ip6->ip6_src; 342 parser->data.d_addr.v6 = parser->ip6->ip6_dst; 343 } 344 mlen -= sizeof(struct ip6_hdr); 345 switch (parser->ip6->ip6_nxt) { 346 case IPPROTO_UDP: 347 if (__predict_false(mlen < sizeof(struct udphdr))) 348 return (NULL); 349 parser->udp = ptr; 350 if (update_data) { 351 parser->data.lro_type = LRO_TYPE_IPV6_UDP; 352 parser->data.s_port = parser->udp->uh_sport; 353 parser->data.d_port = parser->udp->uh_dport; 354 } else { 355 MPASS(parser->data.lro_type == LRO_TYPE_IPV6_UDP); 356 } 357 ptr = (uint8_t *)ptr + sizeof(*parser->udp); 358 parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old; 359 return (ptr); 360 case IPPROTO_TCP: 361 if (__predict_false(mlen < sizeof(struct tcphdr))) 362 return (NULL); 363 parser->tcp = ptr; 364 if (update_data) { 365 parser->data.lro_type = LRO_TYPE_IPV6_TCP; 366 parser->data.s_port = parser->tcp->th_sport; 367 parser->data.d_port = parser->tcp->th_dport; 368 } else { 369 MPASS(parser->data.lro_type == LRO_TYPE_IPV6_TCP); 370 } 371 if (__predict_false(mlen < (parser->tcp->th_off << 2))) 372 return (NULL); 373 ptr = (uint8_t *)ptr + (parser->tcp->th_off << 2); 374 parser->total_hdr_len = (uint8_t *)ptr - (uint8_t *)old; 375 return (ptr); 376 default: 377 break; 378 } 379 break; 380#endif 381 default: 382 break; 383 } 384 /* Invalid packet - cannot parse */ 385 return (NULL); 386} 387 388static const int vxlan_csum = CSUM_INNER_L3_CALC | CSUM_INNER_L3_VALID | 389 CSUM_INNER_L4_CALC | CSUM_INNER_L4_VALID; 390 391static inline struct lro_parser * 392tcp_lro_parser(struct mbuf *m, struct lro_parser *po, struct lro_parser *pi, bool update_data) 393{ 394 void *data_ptr; 395 396 /* Try to parse outer headers first. */ 397 data_ptr = tcp_lro_low_level_parser(m->m_data, po, update_data, false, m->m_len); 398 if (data_ptr == NULL || po->total_hdr_len > m->m_len) 399 return (NULL); 400 401 if (update_data) { 402 /* Store VLAN ID, if any. */ 403 if (__predict_false(m->m_flags & M_VLANTAG)) { 404 po->data.vlan_id = 405 htons(m->m_pkthdr.ether_vtag) & htons(EVL_VLID_MASK); 406 } 407 /* Store decrypted flag, if any. */ 408 if (__predict_false((m->m_pkthdr.csum_flags & 409 CSUM_TLS_MASK) == CSUM_TLS_DECRYPTED)) 410 po->data.lro_flags |= LRO_FLAG_DECRYPTED; 411 } 412 413 switch (po->data.lro_type) { 414 case LRO_TYPE_IPV4_UDP: 415 case LRO_TYPE_IPV6_UDP: 416 /* Check for VXLAN headers. */ 417 if ((m->m_pkthdr.csum_flags & vxlan_csum) != vxlan_csum) 418 break; 419 420 /* Try to parse inner headers. */ 421 data_ptr = tcp_lro_low_level_parser(data_ptr, pi, update_data, true, 422 (m->m_len - ((caddr_t)data_ptr - m->m_data))); 423 if (data_ptr == NULL || (pi->total_hdr_len + po->total_hdr_len) > m->m_len) 424 break; 425 426 /* Verify supported header types. */ 427 switch (pi->data.lro_type) { 428 case LRO_TYPE_IPV4_TCP: 429 case LRO_TYPE_IPV6_TCP: 430 return (pi); 431 default: 432 break; 433 } 434 break; 435 case LRO_TYPE_IPV4_TCP: 436 case LRO_TYPE_IPV6_TCP: 437 if (update_data) 438 memset(pi, 0, sizeof(*pi)); 439 return (po); 440 default: 441 break; 442 } 443 return (NULL); 444} 445 446static inline int 447tcp_lro_trim_mbuf_chain(struct mbuf *m, const struct lro_parser *po) 448{ 449 int len; 450 451 switch (po->data.lro_type) { 452#ifdef INET 453 case LRO_TYPE_IPV4_TCP: 454 len = ((uint8_t *)po->ip4 - (uint8_t *)m->m_data) + 455 ntohs(po->ip4->ip_len); 456 break; 457#endif 458#ifdef INET6 459 case LRO_TYPE_IPV6_TCP: 460 len = ((uint8_t *)po->ip6 - (uint8_t *)m->m_data) + 461 ntohs(po->ip6->ip6_plen) + sizeof(*po->ip6); 462 break; 463#endif 464 default: 465 return (TCP_LRO_CANNOT); 466 } 467 468 /* 469 * If the frame is padded beyond the end of the IP packet, 470 * then trim the extra bytes off: 471 */ 472 if (__predict_true(m->m_pkthdr.len == len)) { 473 return (0); 474 } else if (m->m_pkthdr.len > len) { 475 m_adj(m, len - m->m_pkthdr.len); 476 return (0); 477 } 478 return (TCP_LRO_CANNOT); 479} 480 481static void 482lro_free_mbuf_chain(struct mbuf *m) 483{ 484 struct mbuf *save; 485 486 while (m) { 487 save = m->m_nextpkt; 488 m->m_nextpkt = NULL; 489 m_freem(m); 490 m = save; 491 } 492} 493 494void 495tcp_lro_free(struct lro_ctrl *lc) 496{ 497 struct lro_entry *le; 498 unsigned x; 499 500 /* reset LRO free list */ 501 LIST_INIT(&lc->lro_free); 502 503 /* free active mbufs, if any */ 504 while ((le = LIST_FIRST(&lc->lro_active)) != NULL) { 505 tcp_lro_active_remove(le); 506 lro_free_mbuf_chain(le->m_head); 507 } 508 509 /* free hash table */ 510 free(lc->lro_hash, M_LRO); 511 lc->lro_hash = NULL; 512 lc->lro_hashsz = 0; 513 514 /* free mbuf array, if any */ 515 for (x = 0; x != lc->lro_mbuf_count; x++) 516 m_freem(lc->lro_mbuf_data[x].mb); 517 lc->lro_mbuf_count = 0; 518 519 /* free allocated memory, if any */ 520 free(lc->lro_mbuf_data, M_LRO); 521 lc->lro_mbuf_data = NULL; 522} 523 524static uint16_t 525tcp_lro_rx_csum_tcphdr(const struct tcphdr *th) 526{ 527 const uint16_t *ptr; 528 uint32_t csum; 529 uint16_t len; 530 531 csum = -th->th_sum; /* exclude checksum field */ 532 len = th->th_off; 533 ptr = (const uint16_t *)th; 534 while (len--) { 535 csum += *ptr; 536 ptr++; 537 csum += *ptr; 538 ptr++; 539 } 540 while (csum > 0xffff) 541 csum = (csum >> 16) + (csum & 0xffff); 542 543 return (csum); 544} 545 546static uint16_t 547tcp_lro_rx_csum_data(const struct lro_parser *pa, uint16_t tcp_csum) 548{ 549 uint32_t c; 550 uint16_t cs; 551 552 c = tcp_csum; 553 554 switch (pa->data.lro_type) { 555#ifdef INET6 556 case LRO_TYPE_IPV6_TCP: 557 /* Compute full pseudo IPv6 header checksum. */ 558 cs = in6_cksum_pseudo(pa->ip6, ntohs(pa->ip6->ip6_plen), pa->ip6->ip6_nxt, 0); 559 break; 560#endif 561#ifdef INET 562 case LRO_TYPE_IPV4_TCP: 563 /* Compute full pseudo IPv4 header checsum. */ 564 cs = in_addword(ntohs(pa->ip4->ip_len) - sizeof(*pa->ip4), IPPROTO_TCP); 565 cs = in_pseudo(pa->ip4->ip_src.s_addr, pa->ip4->ip_dst.s_addr, htons(cs)); 566 break; 567#endif 568 default: 569 cs = 0; /* Keep compiler happy. */ 570 break; 571 } 572 573 /* Complement checksum. */ 574 cs = ~cs; 575 c += cs; 576 577 /* Remove TCP header checksum. */ 578 cs = ~tcp_lro_rx_csum_tcphdr(pa->tcp); 579 c += cs; 580 581 /* Compute checksum remainder. */ 582 while (c > 0xffff) 583 c = (c >> 16) + (c & 0xffff); 584 585 return (c); 586} 587 588static void 589tcp_lro_rx_done(struct lro_ctrl *lc) 590{ 591 struct lro_entry *le; 592 593 while ((le = LIST_FIRST(&lc->lro_active)) != NULL) { 594 tcp_lro_active_remove(le); 595 tcp_lro_flush(lc, le); 596 } 597} 598 599static void 600tcp_lro_flush_active(struct lro_ctrl *lc) 601{ 602 struct lro_entry *le; 603 604 /* 605 * Walk through the list of le entries, and 606 * any one that does have packets flush. This 607 * is called because we have an inbound packet 608 * (e.g. SYN) that has to have all others flushed 609 * in front of it. Note we have to do the remove 610 * because tcp_lro_flush() assumes that the entry 611 * is being freed. This is ok it will just get 612 * reallocated again like it was new. 613 */ 614 LIST_FOREACH(le, &lc->lro_active, next) { 615 if (le->m_head != NULL) { 616 tcp_lro_active_remove(le); 617 tcp_lro_flush(lc, le); 618 } 619 } 620} 621 622void 623tcp_lro_flush_inactive(struct lro_ctrl *lc, const struct timeval *timeout) 624{ 625 struct lro_entry *le, *le_tmp; 626 uint64_t now, tov; 627 struct bintime bt; 628 629 NET_EPOCH_ASSERT(); 630 if (LIST_EMPTY(&lc->lro_active)) 631 return; 632 633 /* get timeout time and current time in ns */ 634 binuptime(&bt); 635 now = bintime2ns(&bt); 636 tov = ((timeout->tv_sec * 1000000000) + (timeout->tv_usec * 1000)); 637 LIST_FOREACH_SAFE(le, &lc->lro_active, next, le_tmp) { 638 if (now >= (bintime2ns(&le->alloc_time) + tov)) { 639 tcp_lro_active_remove(le); 640 tcp_lro_flush(lc, le); 641 } 642 } 643} 644 645#ifdef INET 646static int 647tcp_lro_rx_ipv4(struct lro_ctrl *lc, struct mbuf *m, struct ip *ip4) 648{ 649 uint16_t csum; 650 651 /* Legacy IP has a header checksum that needs to be correct. */ 652 if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) { 653 if (__predict_false((m->m_pkthdr.csum_flags & CSUM_IP_VALID) == 0)) { 654 lc->lro_bad_csum++; 655 return (TCP_LRO_CANNOT); 656 } 657 } else { 658 csum = in_cksum_hdr(ip4); 659 if (__predict_false(csum != 0)) { 660 lc->lro_bad_csum++; 661 return (TCP_LRO_CANNOT); 662 } 663 } 664 return (0); 665} 666#endif 667 668static inline void 669tcp_lro_assign_and_checksum_16(uint16_t *ptr, uint16_t value, uint16_t *psum) 670{ 671 uint32_t csum; 672 673 csum = 0xffff - *ptr + value; 674 while (csum > 0xffff) 675 csum = (csum >> 16) + (csum & 0xffff); 676 *ptr = value; 677 *psum = csum; 678} 679 680static uint16_t 681tcp_lro_update_checksum(const struct lro_parser *pa, const struct lro_entry *le, 682 uint16_t payload_len, uint16_t delta_sum) 683{ 684 uint32_t csum; 685 uint16_t tlen; 686 uint16_t temp[5] = {}; 687 688 switch (pa->data.lro_type) { 689 case LRO_TYPE_IPV4_TCP: 690 /* Compute new IPv4 length. */ 691 tlen = (pa->ip4->ip_hl << 2) + (pa->tcp->th_off << 2) + payload_len; 692 tcp_lro_assign_and_checksum_16(&pa->ip4->ip_len, htons(tlen), &temp[0]); 693 694 /* Subtract delta from current IPv4 checksum. */ 695 csum = pa->ip4->ip_sum + 0xffff - temp[0]; 696 while (csum > 0xffff) 697 csum = (csum >> 16) + (csum & 0xffff); 698 tcp_lro_assign_and_checksum_16(&pa->ip4->ip_sum, csum, &temp[1]); 699 goto update_tcp_header; 700 701 case LRO_TYPE_IPV6_TCP: 702 /* Compute new IPv6 length. */ 703 tlen = (pa->tcp->th_off << 2) + payload_len; 704 tcp_lro_assign_and_checksum_16(&pa->ip6->ip6_plen, htons(tlen), &temp[0]); 705 goto update_tcp_header; 706 707 case LRO_TYPE_IPV4_UDP: 708 /* Compute new IPv4 length. */ 709 tlen = (pa->ip4->ip_hl << 2) + sizeof(*pa->udp) + payload_len; 710 tcp_lro_assign_and_checksum_16(&pa->ip4->ip_len, htons(tlen), &temp[0]); 711 712 /* Subtract delta from current IPv4 checksum. */ 713 csum = pa->ip4->ip_sum + 0xffff - temp[0]; 714 while (csum > 0xffff) 715 csum = (csum >> 16) + (csum & 0xffff); 716 tcp_lro_assign_and_checksum_16(&pa->ip4->ip_sum, csum, &temp[1]); 717 goto update_udp_header; 718 719 case LRO_TYPE_IPV6_UDP: 720 /* Compute new IPv6 length. */ 721 tlen = sizeof(*pa->udp) + payload_len; 722 tcp_lro_assign_and_checksum_16(&pa->ip6->ip6_plen, htons(tlen), &temp[0]); 723 goto update_udp_header; 724 725 default: 726 return (0); 727 } 728 729update_tcp_header: 730 /* Compute current TCP header checksum. */ 731 temp[2] = tcp_lro_rx_csum_tcphdr(pa->tcp); 732 733 /* Incorporate the latest ACK into the TCP header. */ 734 pa->tcp->th_ack = le->ack_seq; 735 pa->tcp->th_win = le->window; 736 737 /* Incorporate latest timestamp into the TCP header. */ 738 if (le->timestamp != 0) { 739 uint32_t *ts_ptr; 740 741 ts_ptr = (uint32_t *)(pa->tcp + 1); 742 ts_ptr[1] = htonl(le->tsval); 743 ts_ptr[2] = le->tsecr; 744 } 745 746 /* Compute new TCP header checksum. */ 747 temp[3] = tcp_lro_rx_csum_tcphdr(pa->tcp); 748 749 /* Compute new TCP checksum. */ 750 csum = pa->tcp->th_sum + 0xffff - delta_sum + 751 0xffff - temp[0] + 0xffff - temp[3] + temp[2]; 752 while (csum > 0xffff) 753 csum = (csum >> 16) + (csum & 0xffff); 754 755 /* Assign new TCP checksum. */ 756 tcp_lro_assign_and_checksum_16(&pa->tcp->th_sum, csum, &temp[4]); 757 758 /* Compute all modififications affecting next checksum. */ 759 csum = temp[0] + temp[1] + 0xffff - temp[2] + 760 temp[3] + temp[4] + delta_sum; 761 while (csum > 0xffff) 762 csum = (csum >> 16) + (csum & 0xffff); 763 764 /* Return delta checksum to next stage, if any. */ 765 return (csum); 766 767update_udp_header: 768 tlen = sizeof(*pa->udp) + payload_len; 769 /* Assign new UDP length and compute checksum delta. */ 770 tcp_lro_assign_and_checksum_16(&pa->udp->uh_ulen, htons(tlen), &temp[2]); 771 772 /* Check if there is a UDP checksum. */ 773 if (__predict_false(pa->udp->uh_sum != 0)) { 774 /* Compute new UDP checksum. */ 775 csum = pa->udp->uh_sum + 0xffff - delta_sum + 776 0xffff - temp[0] + 0xffff - temp[2]; 777 while (csum > 0xffff) 778 csum = (csum >> 16) + (csum & 0xffff); 779 /* Assign new UDP checksum. */ 780 tcp_lro_assign_and_checksum_16(&pa->udp->uh_sum, csum, &temp[3]); 781 } 782 783 /* Compute all modififications affecting next checksum. */ 784 csum = temp[0] + temp[1] + temp[2] + temp[3] + delta_sum; 785 while (csum > 0xffff) 786 csum = (csum >> 16) + (csum & 0xffff); 787 788 /* Return delta checksum to next stage, if any. */ 789 return (csum); 790} 791 792static void 793tcp_flush_out_entry(struct lro_ctrl *lc, struct lro_entry *le) 794{ 795 /* Check if we need to recompute any checksums. */ 796 if (le->needs_merge) { 797 uint16_t csum; 798 799 switch (le->inner.data.lro_type) { 800 case LRO_TYPE_IPV4_TCP: 801 csum = tcp_lro_update_checksum(&le->inner, le, 802 le->m_head->m_pkthdr.lro_tcp_d_len, 803 le->m_head->m_pkthdr.lro_tcp_d_csum); 804 csum = tcp_lro_update_checksum(&le->outer, NULL, 805 le->m_head->m_pkthdr.lro_tcp_d_len + 806 le->inner.total_hdr_len, csum); 807 le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID | 808 CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID; 809 le->m_head->m_pkthdr.csum_data = 0xffff; 810 if (__predict_false(le->outer.data.lro_flags & LRO_FLAG_DECRYPTED)) 811 le->m_head->m_pkthdr.csum_flags |= CSUM_TLS_DECRYPTED; 812 break; 813 case LRO_TYPE_IPV6_TCP: 814 csum = tcp_lro_update_checksum(&le->inner, le, 815 le->m_head->m_pkthdr.lro_tcp_d_len, 816 le->m_head->m_pkthdr.lro_tcp_d_csum); 817 csum = tcp_lro_update_checksum(&le->outer, NULL, 818 le->m_head->m_pkthdr.lro_tcp_d_len + 819 le->inner.total_hdr_len, csum); 820 le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID | 821 CSUM_PSEUDO_HDR; 822 le->m_head->m_pkthdr.csum_data = 0xffff; 823 if (__predict_false(le->outer.data.lro_flags & LRO_FLAG_DECRYPTED)) 824 le->m_head->m_pkthdr.csum_flags |= CSUM_TLS_DECRYPTED; 825 break; 826 case LRO_TYPE_NONE: 827 switch (le->outer.data.lro_type) { 828 case LRO_TYPE_IPV4_TCP: 829 csum = tcp_lro_update_checksum(&le->outer, le, 830 le->m_head->m_pkthdr.lro_tcp_d_len, 831 le->m_head->m_pkthdr.lro_tcp_d_csum); 832 le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID | 833 CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID; 834 le->m_head->m_pkthdr.csum_data = 0xffff; 835 if (__predict_false(le->outer.data.lro_flags & LRO_FLAG_DECRYPTED)) 836 le->m_head->m_pkthdr.csum_flags |= CSUM_TLS_DECRYPTED; 837 break; 838 case LRO_TYPE_IPV6_TCP: 839 csum = tcp_lro_update_checksum(&le->outer, le, 840 le->m_head->m_pkthdr.lro_tcp_d_len, 841 le->m_head->m_pkthdr.lro_tcp_d_csum); 842 le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID | 843 CSUM_PSEUDO_HDR; 844 le->m_head->m_pkthdr.csum_data = 0xffff; 845 if (__predict_false(le->outer.data.lro_flags & LRO_FLAG_DECRYPTED)) 846 le->m_head->m_pkthdr.csum_flags |= CSUM_TLS_DECRYPTED; 847 break; 848 default: 849 break; 850 } 851 break; 852 default: 853 break; 854 } 855 } 856 857 /* 858 * Break any chain, this is not set to NULL on the singleton 859 * case m_nextpkt points to m_head. Other case set them 860 * m_nextpkt to NULL in push_and_replace. 861 */ 862 le->m_head->m_nextpkt = NULL; 863 lc->lro_queued += le->m_head->m_pkthdr.lro_nsegs; 864 (*lc->ifp->if_input)(lc->ifp, le->m_head); 865} 866 867static void 868tcp_set_entry_to_mbuf(struct lro_ctrl *lc, struct lro_entry *le, 869 struct mbuf *m, struct tcphdr *th) 870{ 871 uint32_t *ts_ptr; 872 uint16_t tcp_data_len; 873 uint16_t tcp_opt_len; 874 875 ts_ptr = (uint32_t *)(th + 1); 876 tcp_opt_len = (th->th_off << 2); 877 tcp_opt_len -= sizeof(*th); 878 879 /* Check if there is a timestamp option. */ 880 if (tcp_opt_len == 0 || 881 __predict_false(tcp_opt_len != TCPOLEN_TSTAMP_APPA || 882 *ts_ptr != TCP_LRO_TS_OPTION)) { 883 /* We failed to find the timestamp option. */ 884 le->timestamp = 0; 885 } else { 886 le->timestamp = 1; 887 le->tsval = ntohl(*(ts_ptr + 1)); 888 le->tsecr = *(ts_ptr + 2); 889 } 890 891 tcp_data_len = m->m_pkthdr.lro_tcp_d_len; 892 893 /* Pull out TCP sequence numbers and window size. */ 894 le->next_seq = ntohl(th->th_seq) + tcp_data_len; 895 le->ack_seq = th->th_ack; 896 le->window = th->th_win; 897 le->flags = tcp_get_flags(th); 898 le->needs_merge = 0; 899 900 /* Setup new data pointers. */ 901 le->m_head = m; 902 le->m_tail = m_last(m); 903} 904 905static void 906tcp_push_and_replace(struct lro_ctrl *lc, struct lro_entry *le, struct mbuf *m) 907{ 908 struct lro_parser *pa; 909 910 /* 911 * Push up the stack of the current entry 912 * and replace it with "m". 913 */ 914 struct mbuf *msave; 915 916 /* Grab off the next and save it */ 917 msave = le->m_head->m_nextpkt; 918 le->m_head->m_nextpkt = NULL; 919 920 /* Now push out the old entry */ 921 tcp_flush_out_entry(lc, le); 922 923 /* Re-parse new header, should not fail. */ 924 pa = tcp_lro_parser(m, &le->outer, &le->inner, false); 925 KASSERT(pa != NULL, 926 ("tcp_push_and_replace: LRO parser failed on m=%p\n", m)); 927 928 /* 929 * Now to replace the data properly in the entry 930 * we have to reset the TCP header and 931 * other fields. 932 */ 933 tcp_set_entry_to_mbuf(lc, le, m, pa->tcp); 934 935 /* Restore the next list */ 936 m->m_nextpkt = msave; 937} 938 939static void 940tcp_lro_mbuf_append_pkthdr(struct lro_entry *le, const struct mbuf *p) 941{ 942 struct mbuf *m; 943 uint32_t csum; 944 945 m = le->m_head; 946 if (m->m_pkthdr.lro_nsegs == 1) { 947 /* Compute relative checksum. */ 948 csum = p->m_pkthdr.lro_tcp_d_csum; 949 } else { 950 /* Merge TCP data checksums. */ 951 csum = (uint32_t)m->m_pkthdr.lro_tcp_d_csum + 952 (uint32_t)p->m_pkthdr.lro_tcp_d_csum; 953 while (csum > 0xffff) 954 csum = (csum >> 16) + (csum & 0xffff); 955 } 956 957 /* Update various counters. */ 958 m->m_pkthdr.len += p->m_pkthdr.lro_tcp_d_len; 959 m->m_pkthdr.lro_tcp_d_csum = csum; 960 m->m_pkthdr.lro_tcp_d_len += p->m_pkthdr.lro_tcp_d_len; 961 m->m_pkthdr.lro_nsegs += p->m_pkthdr.lro_nsegs; 962 le->needs_merge = 1; 963} 964 965static void 966tcp_lro_condense(struct lro_ctrl *lc, struct lro_entry *le) 967{ 968 /* 969 * Walk through the mbuf chain we 970 * have on tap and compress/condense 971 * as required. 972 */ 973 uint32_t *ts_ptr; 974 struct mbuf *m; 975 struct tcphdr *th; 976 uint32_t tcp_data_len_total; 977 uint32_t tcp_data_seg_total; 978 uint16_t tcp_data_len; 979 uint16_t tcp_opt_len; 980 981 /* 982 * First we must check the lead (m_head) 983 * we must make sure that it is *not* 984 * something that should be sent up 985 * right away (sack etc). 986 */ 987again: 988 m = le->m_head->m_nextpkt; 989 if (m == NULL) { 990 /* Just one left. */ 991 return; 992 } 993 994 th = tcp_lro_get_th(m); 995 tcp_opt_len = (th->th_off << 2); 996 tcp_opt_len -= sizeof(*th); 997 ts_ptr = (uint32_t *)(th + 1); 998 999 if (tcp_opt_len != 0 && __predict_false(tcp_opt_len != TCPOLEN_TSTAMP_APPA || 1000 *ts_ptr != TCP_LRO_TS_OPTION)) { 1001 /* 1002 * Its not the timestamp. We can't 1003 * use this guy as the head. 1004 */ 1005 le->m_head->m_nextpkt = m->m_nextpkt; 1006 tcp_push_and_replace(lc, le, m); 1007 goto again; 1008 } 1009 if ((tcp_get_flags(th) & ~(TH_ACK | TH_PUSH)) != 0) { 1010 /* 1011 * Make sure that previously seen segments/ACKs are delivered 1012 * before this segment, e.g. FIN. 1013 */ 1014 le->m_head->m_nextpkt = m->m_nextpkt; 1015 tcp_push_and_replace(lc, le, m); 1016 goto again; 1017 } 1018 while((m = le->m_head->m_nextpkt) != NULL) { 1019 /* 1020 * condense m into le, first 1021 * pull m out of the list. 1022 */ 1023 le->m_head->m_nextpkt = m->m_nextpkt; 1024 m->m_nextpkt = NULL; 1025 /* Setup my data */ 1026 tcp_data_len = m->m_pkthdr.lro_tcp_d_len; 1027 th = tcp_lro_get_th(m); 1028 ts_ptr = (uint32_t *)(th + 1); 1029 tcp_opt_len = (th->th_off << 2); 1030 tcp_opt_len -= sizeof(*th); 1031 tcp_data_len_total = le->m_head->m_pkthdr.lro_tcp_d_len + tcp_data_len; 1032 tcp_data_seg_total = le->m_head->m_pkthdr.lro_nsegs + m->m_pkthdr.lro_nsegs; 1033 1034 if (tcp_data_seg_total >= lc->lro_ackcnt_lim || 1035 tcp_data_len_total >= lc->lro_length_lim) { 1036 /* Flush now if appending will result in overflow. */ 1037 tcp_push_and_replace(lc, le, m); 1038 goto again; 1039 } 1040 if (tcp_opt_len != 0 && 1041 __predict_false(tcp_opt_len != TCPOLEN_TSTAMP_APPA || 1042 *ts_ptr != TCP_LRO_TS_OPTION)) { 1043 /* 1044 * Maybe a sack in the new one? We need to 1045 * start all over after flushing the 1046 * current le. We will go up to the beginning 1047 * and flush it (calling the replace again possibly 1048 * or just returning). 1049 */ 1050 tcp_push_and_replace(lc, le, m); 1051 goto again; 1052 } 1053 if ((tcp_get_flags(th) & ~(TH_ACK | TH_PUSH)) != 0) { 1054 tcp_push_and_replace(lc, le, m); 1055 goto again; 1056 } 1057 if (tcp_opt_len != 0) { 1058 uint32_t tsval = ntohl(*(ts_ptr + 1)); 1059 /* Make sure timestamp values are increasing. */ 1060 if (TSTMP_GT(le->tsval, tsval)) { 1061 tcp_push_and_replace(lc, le, m); 1062 goto again; 1063 } 1064 le->tsval = tsval; 1065 le->tsecr = *(ts_ptr + 2); 1066 } 1067 /* Try to append the new segment. */ 1068 if (__predict_false(ntohl(th->th_seq) != le->next_seq || 1069 ((tcp_get_flags(th) & TH_ACK) != 1070 (le->flags & TH_ACK)) || 1071 (tcp_data_len == 0 && 1072 le->ack_seq == th->th_ack && 1073 le->window == th->th_win))) { 1074 /* Out of order packet, non-ACK + ACK or dup ACK. */ 1075 tcp_push_and_replace(lc, le, m); 1076 goto again; 1077 } 1078 if (tcp_data_len != 0 || 1079 SEQ_GT(ntohl(th->th_ack), ntohl(le->ack_seq))) { 1080 le->next_seq += tcp_data_len; 1081 le->ack_seq = th->th_ack; 1082 le->window = th->th_win; 1083 le->needs_merge = 1; 1084 } else if (th->th_ack == le->ack_seq) { 1085 if (WIN_GT(th->th_win, le->window)) { 1086 le->window = th->th_win; 1087 le->needs_merge = 1; 1088 } 1089 } 1090 1091 if (tcp_data_len == 0) { 1092 m_freem(m); 1093 continue; 1094 } 1095 1096 /* Merge TCP data checksum and length to head mbuf. */ 1097 tcp_lro_mbuf_append_pkthdr(le, m); 1098 1099 /* 1100 * Adjust the mbuf so that m_data points to the first byte of 1101 * the ULP payload. Adjust the mbuf to avoid complications and 1102 * append new segment to existing mbuf chain. 1103 */ 1104 m_adj(m, m->m_pkthdr.len - tcp_data_len); 1105 m_demote_pkthdr(m); 1106 le->m_tail->m_next = m; 1107 le->m_tail = m_last(m); 1108 } 1109} 1110 1111void 1112tcp_lro_flush(struct lro_ctrl *lc, struct lro_entry *le) 1113{ 1114 1115 /* Only optimise if there are multiple packets waiting. */ 1116 NET_EPOCH_ASSERT(); 1117 if (tcp_lro_flush_tcphpts == NULL || 1118 tcp_lro_flush_tcphpts(lc, le) != 0) { 1119 tcp_lro_condense(lc, le); 1120 tcp_flush_out_entry(lc, le); 1121 } 1122 lc->lro_flushed++; 1123 bzero(le, sizeof(*le)); 1124 LIST_INSERT_HEAD(&lc->lro_free, le, next); 1125} 1126 1127#define tcp_lro_msb_64(x) (1ULL << (flsll(x) - 1)) 1128 1129/* 1130 * The tcp_lro_sort() routine is comparable to qsort(), except it has 1131 * a worst case complexity limit of O(MIN(N,64)*N), where N is the 1132 * number of elements to sort and 64 is the number of sequence bits 1133 * available. The algorithm is bit-slicing the 64-bit sequence number, 1134 * sorting one bit at a time from the most significant bit until the 1135 * least significant one, skipping the constant bits. This is 1136 * typically called a radix sort. 1137 */ 1138static void 1139tcp_lro_sort(struct lro_mbuf_sort *parray, uint32_t size) 1140{ 1141 struct lro_mbuf_sort temp; 1142 uint64_t ones; 1143 uint64_t zeros; 1144 uint32_t x; 1145 uint32_t y; 1146 1147repeat: 1148 /* for small arrays insertion sort is faster */ 1149 if (size <= 12) { 1150 for (x = 1; x < size; x++) { 1151 temp = parray[x]; 1152 for (y = x; y > 0 && temp.seq < parray[y - 1].seq; y--) 1153 parray[y] = parray[y - 1]; 1154 parray[y] = temp; 1155 } 1156 return; 1157 } 1158 1159 /* compute sequence bits which are constant */ 1160 ones = 0; 1161 zeros = 0; 1162 for (x = 0; x != size; x++) { 1163 ones |= parray[x].seq; 1164 zeros |= ~parray[x].seq; 1165 } 1166 1167 /* compute bits which are not constant into "ones" */ 1168 ones &= zeros; 1169 if (ones == 0) 1170 return; 1171 1172 /* pick the most significant bit which is not constant */ 1173 ones = tcp_lro_msb_64(ones); 1174 1175 /* 1176 * Move entries having cleared sequence bits to the beginning 1177 * of the array: 1178 */ 1179 for (x = y = 0; y != size; y++) { 1180 /* skip set bits */ 1181 if (parray[y].seq & ones) 1182 continue; 1183 /* swap entries */ 1184 temp = parray[x]; 1185 parray[x] = parray[y]; 1186 parray[y] = temp; 1187 x++; 1188 } 1189 1190 KASSERT(x != 0 && x != size, ("Memory is corrupted\n")); 1191 1192 /* sort zeros */ 1193 tcp_lro_sort(parray, x); 1194 1195 /* sort ones */ 1196 parray += x; 1197 size -= x; 1198 goto repeat; 1199} 1200 1201void 1202tcp_lro_flush_all(struct lro_ctrl *lc) 1203{ 1204 uint64_t seq; 1205 uint64_t nseq; 1206 unsigned x; 1207 1208 NET_EPOCH_ASSERT(); 1209 /* check if no mbufs to flush */ 1210 if (lc->lro_mbuf_count == 0) 1211 goto done; 1212 if (lc->lro_cpu_is_set == 0) { 1213 if (lc->lro_last_cpu == curcpu) { 1214 lc->lro_cnt_of_same_cpu++; 1215 /* Have we reached the threshold to declare a cpu? */ 1216 if (lc->lro_cnt_of_same_cpu > tcp_lro_cpu_set_thresh) 1217 lc->lro_cpu_is_set = 1; 1218 } else { 1219 lc->lro_last_cpu = curcpu; 1220 lc->lro_cnt_of_same_cpu = 0; 1221 } 1222 } 1223 CURVNET_SET(lc->ifp->if_vnet); 1224 1225 /* get current time */ 1226 binuptime(&lc->lro_last_queue_time); 1227 1228 /* sort all mbufs according to stream */ 1229 tcp_lro_sort(lc->lro_mbuf_data, lc->lro_mbuf_count); 1230 1231 /* input data into LRO engine, stream by stream */ 1232 seq = 0; 1233 for (x = 0; x != lc->lro_mbuf_count; x++) { 1234 struct mbuf *mb; 1235 1236 /* get mbuf */ 1237 mb = lc->lro_mbuf_data[x].mb; 1238 1239 /* get sequence number, masking away the packet index */ 1240 nseq = lc->lro_mbuf_data[x].seq & (-1ULL << 24); 1241 1242 /* check for new stream */ 1243 if (seq != nseq) { 1244 seq = nseq; 1245 1246 /* flush active streams */ 1247 tcp_lro_rx_done(lc); 1248 } 1249 1250 /* add packet to LRO engine */ 1251 if (tcp_lro_rx_common(lc, mb, 0, false) != 0) { 1252 /* Flush anything we have acummulated */ 1253 tcp_lro_flush_active(lc); 1254 /* input packet to network layer */ 1255 (*lc->ifp->if_input)(lc->ifp, mb); 1256 lc->lro_queued++; 1257 lc->lro_flushed++; 1258 } 1259 } 1260 CURVNET_RESTORE(); 1261done: 1262 /* flush active streams */ 1263 tcp_lro_rx_done(lc); 1264 tcp_hpts_softclock(); 1265 lc->lro_mbuf_count = 0; 1266} 1267 1268static struct lro_head * 1269tcp_lro_rx_get_bucket(struct lro_ctrl *lc, struct mbuf *m, struct lro_parser *parser) 1270{ 1271 u_long hash; 1272 1273 if (M_HASHTYPE_ISHASH(m)) { 1274 hash = m->m_pkthdr.flowid; 1275 } else { 1276 for (unsigned i = hash = 0; i != LRO_RAW_ADDRESS_MAX; i++) 1277 hash += parser->data.raw[i]; 1278 } 1279 return (&lc->lro_hash[hash % lc->lro_hashsz]); 1280} 1281 1282static int 1283tcp_lro_rx_common(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum, bool use_hash) 1284{ 1285 struct lro_parser pi; /* inner address data */ 1286 struct lro_parser po; /* outer address data */ 1287 struct lro_parser *pa; /* current parser for TCP stream */ 1288 struct lro_entry *le; 1289 struct lro_head *bucket; 1290 struct tcphdr *th; 1291 int tcp_data_len; 1292 int tcp_opt_len; 1293 int error; 1294 uint16_t tcp_data_sum; 1295 1296#ifdef INET 1297 /* Quickly decide if packet cannot be LRO'ed */ 1298 if (__predict_false(V_ipforwarding != 0)) 1299 return (TCP_LRO_CANNOT); 1300#endif 1301#ifdef INET6 1302 /* Quickly decide if packet cannot be LRO'ed */ 1303 if (__predict_false(V_ip6_forwarding != 0)) 1304 return (TCP_LRO_CANNOT); 1305#endif 1306 if (((m->m_pkthdr.csum_flags & (CSUM_DATA_VALID | CSUM_PSEUDO_HDR)) != 1307 ((CSUM_DATA_VALID | CSUM_PSEUDO_HDR))) || 1308 (m->m_pkthdr.csum_data != 0xffff)) { 1309 /* 1310 * The checksum either did not have hardware offload 1311 * or it was a bad checksum. We can't LRO such 1312 * a packet. 1313 */ 1314 counter_u64_add(tcp_bad_csums, 1); 1315 return (TCP_LRO_CANNOT); 1316 } 1317 /* We expect a contiguous header [eh, ip, tcp]. */ 1318 pa = tcp_lro_parser(m, &po, &pi, true); 1319 if (__predict_false(pa == NULL)) 1320 return (TCP_LRO_NOT_SUPPORTED); 1321 1322 /* We don't expect any padding. */ 1323 error = tcp_lro_trim_mbuf_chain(m, pa); 1324 if (__predict_false(error != 0)) 1325 return (error); 1326 1327#ifdef INET 1328 switch (pa->data.lro_type) { 1329 case LRO_TYPE_IPV4_TCP: 1330 error = tcp_lro_rx_ipv4(lc, m, pa->ip4); 1331 if (__predict_false(error != 0)) 1332 return (error); 1333 break; 1334 default: 1335 break; 1336 } 1337#endif 1338 /* If no hardware or arrival stamp on the packet add timestamp */ 1339 if ((m->m_flags & (M_TSTMP_LRO | M_TSTMP)) == 0) { 1340 m->m_pkthdr.rcv_tstmp = bintime2ns(&lc->lro_last_queue_time); 1341 m->m_flags |= M_TSTMP_LRO; 1342 } 1343 1344 /* Get pointer to TCP header. */ 1345 th = pa->tcp; 1346 1347 /* Don't process SYN packets. */ 1348 if (__predict_false(tcp_get_flags(th) & TH_SYN)) 1349 return (TCP_LRO_CANNOT); 1350 1351 /* Get total TCP header length and compute payload length. */ 1352 tcp_opt_len = (th->th_off << 2); 1353 tcp_data_len = m->m_pkthdr.len - ((uint8_t *)th - 1354 (uint8_t *)m->m_data) - tcp_opt_len; 1355 tcp_opt_len -= sizeof(*th); 1356 1357 /* Don't process invalid TCP headers. */ 1358 if (__predict_false(tcp_opt_len < 0 || tcp_data_len < 0)) 1359 return (TCP_LRO_CANNOT); 1360 1361 /* Compute TCP data only checksum. */ 1362 if (tcp_data_len == 0) 1363 tcp_data_sum = 0; /* no data, no checksum */ 1364 else if (__predict_false(csum != 0)) 1365 tcp_data_sum = tcp_lro_rx_csum_data(pa, ~csum); 1366 else 1367 tcp_data_sum = tcp_lro_rx_csum_data(pa, ~th->th_sum); 1368 1369 /* Save TCP info in mbuf. */ 1370 m->m_nextpkt = NULL; 1371 m->m_pkthdr.rcvif = lc->ifp; 1372 m->m_pkthdr.lro_tcp_d_csum = tcp_data_sum; 1373 m->m_pkthdr.lro_tcp_d_len = tcp_data_len; 1374 m->m_pkthdr.lro_tcp_h_off = ((uint8_t *)th - (uint8_t *)m->m_data); 1375 m->m_pkthdr.lro_nsegs = 1; 1376 1377 /* Get hash bucket. */ 1378 if (!use_hash) { 1379 bucket = &lc->lro_hash[0]; 1380 } else { 1381 bucket = tcp_lro_rx_get_bucket(lc, m, pa); 1382 } 1383 1384 /* Try to find a matching previous segment. */ 1385 LIST_FOREACH(le, bucket, hash_next) { 1386 /* Compare addresses and ports. */ 1387 if (lro_address_compare(&po.data, &le->outer.data) == false || 1388 lro_address_compare(&pi.data, &le->inner.data) == false) 1389 continue; 1390 1391 /* Check if no data and old ACK. */ 1392 if (tcp_data_len == 0 && 1393 SEQ_LT(ntohl(th->th_ack), ntohl(le->ack_seq))) { 1394 m_freem(m); 1395 return (0); 1396 } 1397 1398 /* Mark "m" in the last spot. */ 1399 le->m_last_mbuf->m_nextpkt = m; 1400 /* Now set the tail to "m". */ 1401 le->m_last_mbuf = m; 1402 return (0); 1403 } 1404 1405 /* Try to find an empty slot. */ 1406 if (LIST_EMPTY(&lc->lro_free)) 1407 return (TCP_LRO_NO_ENTRIES); 1408 1409 /* Start a new segment chain. */ 1410 le = LIST_FIRST(&lc->lro_free); 1411 LIST_REMOVE(le, next); 1412 tcp_lro_active_insert(lc, bucket, le); 1413 1414 /* Make sure the headers are set. */ 1415 le->inner = pi; 1416 le->outer = po; 1417 1418 /* Store time this entry was allocated. */ 1419 le->alloc_time = lc->lro_last_queue_time; 1420 1421 tcp_set_entry_to_mbuf(lc, le, m, th); 1422 1423 /* Now set the tail to "m". */ 1424 le->m_last_mbuf = m; 1425 1426 return (0); 1427} 1428 1429int 1430tcp_lro_rx(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum) 1431{ 1432 int error; 1433 1434 if (((m->m_pkthdr.csum_flags & (CSUM_DATA_VALID | CSUM_PSEUDO_HDR)) != 1435 ((CSUM_DATA_VALID | CSUM_PSEUDO_HDR))) || 1436 (m->m_pkthdr.csum_data != 0xffff)) { 1437 /* 1438 * The checksum either did not have hardware offload 1439 * or it was a bad checksum. We can't LRO such 1440 * a packet. 1441 */ 1442 counter_u64_add(tcp_bad_csums, 1); 1443 return (TCP_LRO_CANNOT); 1444 } 1445 /* get current time */ 1446 binuptime(&lc->lro_last_queue_time); 1447 CURVNET_SET(lc->ifp->if_vnet); 1448 error = tcp_lro_rx_common(lc, m, csum, true); 1449 if (__predict_false(error != 0)) { 1450 /* 1451 * Flush anything we have acummulated 1452 * ahead of this packet that can't 1453 * be LRO'd. This preserves order. 1454 */ 1455 tcp_lro_flush_active(lc); 1456 } 1457 CURVNET_RESTORE(); 1458 1459 return (error); 1460} 1461 1462void 1463tcp_lro_queue_mbuf(struct lro_ctrl *lc, struct mbuf *mb) 1464{ 1465 NET_EPOCH_ASSERT(); 1466 /* sanity checks */ 1467 if (__predict_false(lc->ifp == NULL || lc->lro_mbuf_data == NULL || 1468 lc->lro_mbuf_max == 0)) { 1469 /* packet drop */ 1470 m_freem(mb); 1471 return; 1472 } 1473 1474 /* check if packet is not LRO capable */ 1475 if (__predict_false((lc->ifp->if_capenable & IFCAP_LRO) == 0)) { 1476 /* input packet to network layer */ 1477 (*lc->ifp->if_input) (lc->ifp, mb); 1478 return; 1479 } 1480 1481 /* If no hardware or arrival stamp on the packet add timestamp */ 1482 if ((tcplro_stacks_wanting_mbufq > 0) && 1483 (tcp_less_accurate_lro_ts == 0) && 1484 ((mb->m_flags & M_TSTMP) == 0)) { 1485 /* Add in an LRO time since no hardware */ 1486 binuptime(&lc->lro_last_queue_time); 1487 mb->m_pkthdr.rcv_tstmp = bintime2ns(&lc->lro_last_queue_time); 1488 mb->m_flags |= M_TSTMP_LRO; 1489 } 1490 1491 /* create sequence number */ 1492 lc->lro_mbuf_data[lc->lro_mbuf_count].seq = 1493 (((uint64_t)M_HASHTYPE_GET(mb)) << 56) | 1494 (((uint64_t)mb->m_pkthdr.flowid) << 24) | 1495 ((uint64_t)lc->lro_mbuf_count); 1496 1497 /* enter mbuf */ 1498 lc->lro_mbuf_data[lc->lro_mbuf_count].mb = mb; 1499 1500 /* flush if array is full */ 1501 if (__predict_false(++lc->lro_mbuf_count == lc->lro_mbuf_max)) 1502 tcp_lro_flush_all(lc); 1503} 1504 1505/* end */ 1506