e5ca1ffab5
Specifcially, in_cksum_hdr() returns 0 (not 0xffff) when the IPv4 checksum is correct. Without this fix, the tcp_lro code will reject good IPv4 traffic from drivers that do not implement IPv4 header harder csum offload. Sponsored by: Myricom Inc. MFC after: 7 days
616 lines
14 KiB
C
616 lines
14 KiB
C
/*-
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* Copyright (c) 2007, Myricom Inc.
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* Copyright (c) 2008, Intel Corporation.
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* Copyright (c) 2012 The FreeBSD Foundation
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* All rights reserved.
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*
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* Portions of this software were developed by Bjoern Zeeb
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/ethernet.h>
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#include <net/vnet.h>
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip6.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_lro.h>
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#include <netinet6/ip6_var.h>
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#include <machine/in_cksum.h>
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#ifndef LRO_ENTRIES
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#define LRO_ENTRIES 8 /* # of LRO entries per RX queue. */
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#endif
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#define TCP_LRO_UPDATE_CSUM 1
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#ifndef TCP_LRO_UPDATE_CSUM
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#define TCP_LRO_INVALID_CSUM 0x0000
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#endif
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int
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tcp_lro_init(struct lro_ctrl *lc)
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{
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struct lro_entry *le;
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int error, i;
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lc->lro_bad_csum = 0;
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lc->lro_queued = 0;
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lc->lro_flushed = 0;
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lc->lro_cnt = 0;
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SLIST_INIT(&lc->lro_free);
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SLIST_INIT(&lc->lro_active);
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error = 0;
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for (i = 0; i < LRO_ENTRIES; i++) {
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le = (struct lro_entry *)malloc(sizeof(*le), M_DEVBUF,
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M_NOWAIT | M_ZERO);
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if (le == NULL) {
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if (i == 0)
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error = ENOMEM;
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break;
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}
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lc->lro_cnt = i + 1;
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SLIST_INSERT_HEAD(&lc->lro_free, le, next);
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}
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return (error);
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}
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void
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tcp_lro_free(struct lro_ctrl *lc)
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{
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struct lro_entry *le;
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while (!SLIST_EMPTY(&lc->lro_free)) {
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le = SLIST_FIRST(&lc->lro_free);
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SLIST_REMOVE_HEAD(&lc->lro_free, next);
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free(le, M_DEVBUF);
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}
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}
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#ifdef TCP_LRO_UPDATE_CSUM
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static uint16_t
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tcp_lro_csum_th(struct tcphdr *th)
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{
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uint32_t ch;
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uint16_t *p, l;
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ch = th->th_sum = 0x0000;
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l = th->th_off;
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p = (uint16_t *)th;
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while (l > 0) {
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ch += *p;
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p++;
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ch += *p;
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p++;
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l--;
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}
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while (ch > 0xffff)
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ch = (ch >> 16) + (ch & 0xffff);
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return (ch & 0xffff);
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}
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static uint16_t
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tcp_lro_rx_csum_fixup(struct lro_entry *le, void *l3hdr, struct tcphdr *th,
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uint16_t tcp_data_len, uint16_t csum)
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{
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uint32_t c;
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uint16_t cs;
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c = csum;
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/* Remove length from checksum. */
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switch (le->eh_type) {
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#ifdef INET6
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case ETHERTYPE_IPV6:
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{
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struct ip6_hdr *ip6;
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ip6 = (struct ip6_hdr *)l3hdr;
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if (le->append_cnt == 0)
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cs = ip6->ip6_plen;
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else {
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uint32_t cx;
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cx = ntohs(ip6->ip6_plen);
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cs = in6_cksum_pseudo(ip6, cx, ip6->ip6_nxt, 0);
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}
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break;
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}
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#endif
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#ifdef INET
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case ETHERTYPE_IP:
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{
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struct ip *ip4;
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ip4 = (struct ip *)l3hdr;
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if (le->append_cnt == 0)
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cs = ip4->ip_len;
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else {
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cs = in_addword(ntohs(ip4->ip_len) - sizeof(*ip4),
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IPPROTO_TCP);
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cs = in_pseudo(ip4->ip_src.s_addr, ip4->ip_dst.s_addr,
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htons(cs));
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}
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break;
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}
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#endif
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default:
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cs = 0; /* Keep compiler happy. */
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}
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cs = ~cs;
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c += cs;
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/* Remove TCP header csum. */
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cs = ~tcp_lro_csum_th(th);
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c += cs;
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while (c > 0xffff)
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c = (c >> 16) + (c & 0xffff);
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return (c & 0xffff);
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}
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#endif
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void
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tcp_lro_flush(struct lro_ctrl *lc, struct lro_entry *le)
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{
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if (le->append_cnt > 0) {
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struct tcphdr *th;
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uint16_t p_len;
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p_len = htons(le->p_len);
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switch (le->eh_type) {
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#ifdef INET6
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case ETHERTYPE_IPV6:
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{
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struct ip6_hdr *ip6;
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ip6 = le->le_ip6;
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ip6->ip6_plen = p_len;
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th = (struct tcphdr *)(ip6 + 1);
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le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
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CSUM_PSEUDO_HDR;
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le->p_len += ETHER_HDR_LEN + sizeof(*ip6);
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break;
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}
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#endif
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#ifdef INET
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case ETHERTYPE_IP:
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{
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struct ip *ip4;
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#ifdef TCP_LRO_UPDATE_CSUM
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uint32_t cl;
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uint16_t c;
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#endif
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ip4 = le->le_ip4;
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#ifdef TCP_LRO_UPDATE_CSUM
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/* Fix IP header checksum for new length. */
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c = ~ip4->ip_sum;
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cl = c;
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c = ~ip4->ip_len;
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cl += c + p_len;
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while (cl > 0xffff)
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cl = (cl >> 16) + (cl & 0xffff);
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c = cl;
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ip4->ip_sum = ~c;
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#else
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ip4->ip_sum = TCP_LRO_INVALID_CSUM;
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#endif
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ip4->ip_len = p_len;
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th = (struct tcphdr *)(ip4 + 1);
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le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
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CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID;
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le->p_len += ETHER_HDR_LEN;
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break;
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}
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#endif
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default:
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th = NULL; /* Keep compiler happy. */
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}
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le->m_head->m_pkthdr.csum_data = 0xffff;
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le->m_head->m_pkthdr.len = le->p_len;
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/* Incorporate the latest ACK into the TCP header. */
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th->th_ack = le->ack_seq;
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th->th_win = le->window;
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/* Incorporate latest timestamp into the TCP header. */
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if (le->timestamp != 0) {
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uint32_t *ts_ptr;
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ts_ptr = (uint32_t *)(th + 1);
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ts_ptr[1] = htonl(le->tsval);
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ts_ptr[2] = le->tsecr;
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}
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#ifdef TCP_LRO_UPDATE_CSUM
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/* Update the TCP header checksum. */
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le->ulp_csum += p_len;
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le->ulp_csum += tcp_lro_csum_th(th);
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while (le->ulp_csum > 0xffff)
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le->ulp_csum = (le->ulp_csum >> 16) +
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(le->ulp_csum & 0xffff);
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th->th_sum = (le->ulp_csum & 0xffff);
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th->th_sum = ~th->th_sum;
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#else
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th->th_sum = TCP_LRO_INVALID_CSUM;
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#endif
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}
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(*lc->ifp->if_input)(lc->ifp, le->m_head);
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lc->lro_queued += le->append_cnt + 1;
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lc->lro_flushed++;
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bzero(le, sizeof(*le));
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SLIST_INSERT_HEAD(&lc->lro_free, le, next);
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}
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#ifdef INET6
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static int
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tcp_lro_rx_ipv6(struct lro_ctrl *lc, struct mbuf *m, struct ip6_hdr *ip6,
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struct tcphdr **th)
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{
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/* XXX-BZ we should check the flow-label. */
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/* XXX-BZ We do not yet support ext. hdrs. */
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if (ip6->ip6_nxt != IPPROTO_TCP)
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return (TCP_LRO_NOT_SUPPORTED);
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/* Find the TCP header. */
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*th = (struct tcphdr *)(ip6 + 1);
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return (0);
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}
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#endif
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#ifdef INET
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static int
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tcp_lro_rx_ipv4(struct lro_ctrl *lc, struct mbuf *m, struct ip *ip4,
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struct tcphdr **th)
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{
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int csum_flags;
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uint16_t csum;
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if (ip4->ip_p != IPPROTO_TCP)
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return (TCP_LRO_NOT_SUPPORTED);
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/* Ensure there are no options. */
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if ((ip4->ip_hl << 2) != sizeof (*ip4))
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return (TCP_LRO_CANNOT);
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/* .. and the packet is not fragmented. */
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if (ip4->ip_off & htons(IP_MF|IP_OFFMASK))
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return (TCP_LRO_CANNOT);
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/* Legacy IP has a header checksum that needs to be correct. */
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csum_flags = m->m_pkthdr.csum_flags;
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if (csum_flags & CSUM_IP_CHECKED) {
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if (__predict_false((csum_flags & CSUM_IP_VALID) == 0)) {
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lc->lro_bad_csum++;
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return (TCP_LRO_CANNOT);
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}
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} else {
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csum = in_cksum_hdr(ip4);
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if (__predict_false((csum) != 0)) {
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lc->lro_bad_csum++;
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return (TCP_LRO_CANNOT);
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}
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}
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/* Find the TCP header (we assured there are no IP options). */
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*th = (struct tcphdr *)(ip4 + 1);
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return (0);
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}
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#endif
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int
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tcp_lro_rx(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum)
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{
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struct lro_entry *le;
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struct ether_header *eh;
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#ifdef INET6
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struct ip6_hdr *ip6 = NULL; /* Keep compiler happy. */
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#endif
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#ifdef INET
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struct ip *ip4 = NULL; /* Keep compiler happy. */
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#endif
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struct tcphdr *th;
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void *l3hdr = NULL; /* Keep compiler happy. */
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uint32_t *ts_ptr;
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tcp_seq seq;
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int error, ip_len, l;
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uint16_t eh_type, tcp_data_len;
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/* We expect a contiguous header [eh, ip, tcp]. */
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eh = mtod(m, struct ether_header *);
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eh_type = ntohs(eh->ether_type);
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switch (eh_type) {
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#ifdef INET6
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case ETHERTYPE_IPV6:
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{
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CURVNET_SET(lc->ifp->if_vnet);
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if (V_ip6_forwarding != 0) {
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/* XXX-BZ stats but changing lro_ctrl is a problem. */
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CURVNET_RESTORE();
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return (TCP_LRO_CANNOT);
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}
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CURVNET_RESTORE();
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l3hdr = ip6 = (struct ip6_hdr *)(eh + 1);
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error = tcp_lro_rx_ipv6(lc, m, ip6, &th);
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if (error != 0)
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return (error);
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tcp_data_len = ntohs(ip6->ip6_plen);
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ip_len = sizeof(*ip6) + tcp_data_len;
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break;
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}
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#endif
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#ifdef INET
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case ETHERTYPE_IP:
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{
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CURVNET_SET(lc->ifp->if_vnet);
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if (V_ipforwarding != 0) {
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/* XXX-BZ stats but changing lro_ctrl is a problem. */
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CURVNET_RESTORE();
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return (TCP_LRO_CANNOT);
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}
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CURVNET_RESTORE();
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l3hdr = ip4 = (struct ip *)(eh + 1);
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error = tcp_lro_rx_ipv4(lc, m, ip4, &th);
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if (error != 0)
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return (error);
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ip_len = ntohs(ip4->ip_len);
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tcp_data_len = ip_len - sizeof(*ip4);
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break;
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}
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#endif
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/* XXX-BZ what happens in case of VLAN(s)? */
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default:
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return (TCP_LRO_NOT_SUPPORTED);
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}
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/*
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* If the frame is padded beyond the end of the IP packet, then we must
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* trim the extra bytes off.
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*/
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l = m->m_pkthdr.len - (ETHER_HDR_LEN + ip_len);
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if (l != 0) {
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if (l < 0)
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/* Truncated packet. */
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return (TCP_LRO_CANNOT);
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m_adj(m, -l);
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}
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/*
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* Check TCP header constraints.
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*/
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/* Ensure no bits set besides ACK or PSH. */
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if ((th->th_flags & ~(TH_ACK | TH_PUSH)) != 0)
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return (TCP_LRO_CANNOT);
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/* XXX-BZ We lose a AKC|PUSH flag concatinating multiple segments. */
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/* XXX-BZ Ideally we'd flush on PUSH? */
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/*
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* Check for timestamps.
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* Since the only option we handle are timestamps, we only have to
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* handle the simple case of aligned timestamps.
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*/
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l = (th->th_off << 2);
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tcp_data_len -= l;
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l -= sizeof(*th);
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ts_ptr = (uint32_t *)(th + 1);
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if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) ||
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(*ts_ptr != ntohl(TCPOPT_NOP<<24|TCPOPT_NOP<<16|
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TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP))))
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return (TCP_LRO_CANNOT);
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/* If the driver did not pass in the checksum, set it now. */
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if (csum == 0x0000)
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csum = th->th_sum;
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seq = ntohl(th->th_seq);
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/* Try to find a matching previous segment. */
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SLIST_FOREACH(le, &lc->lro_active, next) {
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if (le->eh_type != eh_type)
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continue;
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if (le->source_port != th->th_sport ||
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le->dest_port != th->th_dport)
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continue;
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switch (eh_type) {
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#ifdef INET6
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case ETHERTYPE_IPV6:
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if (bcmp(&le->source_ip6, &ip6->ip6_src,
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sizeof(struct in6_addr)) != 0 ||
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bcmp(&le->dest_ip6, &ip6->ip6_dst,
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sizeof(struct in6_addr)) != 0)
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continue;
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break;
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#endif
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#ifdef INET
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case ETHERTYPE_IP:
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if (le->source_ip4 != ip4->ip_src.s_addr ||
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le->dest_ip4 != ip4->ip_dst.s_addr)
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continue;
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break;
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#endif
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}
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/* Flush now if appending will result in overflow. */
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if (le->p_len > (65535 - tcp_data_len)) {
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SLIST_REMOVE(&lc->lro_active, le, lro_entry, next);
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tcp_lro_flush(lc, le);
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break;
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}
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/* Try to append the new segment. */
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if (__predict_false(seq != le->next_seq ||
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(tcp_data_len == 0 && le->ack_seq == th->th_ack))) {
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/* Out of order packet or duplicate ACK. */
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SLIST_REMOVE(&lc->lro_active, le, lro_entry, next);
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tcp_lro_flush(lc, le);
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return (TCP_LRO_CANNOT);
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}
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if (l != 0) {
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uint32_t tsval = ntohl(*(ts_ptr + 1));
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/* Make sure timestamp values are increasing. */
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/* XXX-BZ flip and use TSTMP_GEQ macro for this? */
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if (__predict_false(le->tsval > tsval ||
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*(ts_ptr + 2) == 0))
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return (TCP_LRO_CANNOT);
|
|
le->tsval = tsval;
|
|
le->tsecr = *(ts_ptr + 2);
|
|
}
|
|
|
|
le->next_seq += tcp_data_len;
|
|
le->ack_seq = th->th_ack;
|
|
le->window = th->th_win;
|
|
le->append_cnt++;
|
|
|
|
#ifdef TCP_LRO_UPDATE_CSUM
|
|
le->ulp_csum += tcp_lro_rx_csum_fixup(le, l3hdr, th,
|
|
tcp_data_len, ~csum);
|
|
#endif
|
|
|
|
if (tcp_data_len == 0) {
|
|
m_freem(m);
|
|
return (0);
|
|
}
|
|
|
|
le->p_len += tcp_data_len;
|
|
|
|
/*
|
|
* Adjust the mbuf so that m_data points to the first byte of
|
|
* the ULP payload. Adjust the mbuf to avoid complications and
|
|
* append new segment to existing mbuf chain.
|
|
*/
|
|
m_adj(m, m->m_pkthdr.len - tcp_data_len);
|
|
m->m_flags &= ~M_PKTHDR;
|
|
|
|
le->m_tail->m_next = m;
|
|
le->m_tail = m_last(m);
|
|
|
|
/*
|
|
* If a possible next full length packet would cause an
|
|
* overflow, pro-actively flush now.
|
|
*/
|
|
if (le->p_len > (65535 - lc->ifp->if_mtu)) {
|
|
SLIST_REMOVE(&lc->lro_active, le, lro_entry, next);
|
|
tcp_lro_flush(lc, le);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Try to find an empty slot. */
|
|
if (SLIST_EMPTY(&lc->lro_free))
|
|
return (TCP_LRO_CANNOT);
|
|
|
|
/* Start a new segment chain. */
|
|
le = SLIST_FIRST(&lc->lro_free);
|
|
SLIST_REMOVE_HEAD(&lc->lro_free, next);
|
|
SLIST_INSERT_HEAD(&lc->lro_active, le, next);
|
|
|
|
/* Start filling in details. */
|
|
switch (eh_type) {
|
|
#ifdef INET6
|
|
case ETHERTYPE_IPV6:
|
|
le->le_ip6 = ip6;
|
|
le->source_ip6 = ip6->ip6_src;
|
|
le->dest_ip6 = ip6->ip6_dst;
|
|
le->eh_type = eh_type;
|
|
le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN - sizeof(*ip6);
|
|
break;
|
|
#endif
|
|
#ifdef INET
|
|
case ETHERTYPE_IP:
|
|
le->le_ip4 = ip4;
|
|
le->source_ip4 = ip4->ip_src.s_addr;
|
|
le->dest_ip4 = ip4->ip_dst.s_addr;
|
|
le->eh_type = eh_type;
|
|
le->p_len = m->m_pkthdr.len - ETHER_HDR_LEN;
|
|
break;
|
|
#endif
|
|
}
|
|
le->source_port = th->th_sport;
|
|
le->dest_port = th->th_dport;
|
|
|
|
le->next_seq = seq + tcp_data_len;
|
|
le->ack_seq = th->th_ack;
|
|
le->window = th->th_win;
|
|
if (l != 0) {
|
|
le->timestamp = 1;
|
|
le->tsval = ntohl(*(ts_ptr + 1));
|
|
le->tsecr = *(ts_ptr + 2);
|
|
}
|
|
|
|
#ifdef TCP_LRO_UPDATE_CSUM
|
|
/*
|
|
* Do not touch the csum of the first packet. However save the
|
|
* "adjusted" checksum of just the source and destination addresses,
|
|
* the next header and the TCP payload. The length and TCP header
|
|
* parts may change, so we remove those from the saved checksum and
|
|
* re-add with final values on tcp_lro_flush() if needed.
|
|
*/
|
|
KASSERT(le->ulp_csum == 0, ("%s: le=%p le->ulp_csum=0x%04x\n",
|
|
__func__, le, le->ulp_csum));
|
|
|
|
le->ulp_csum = tcp_lro_rx_csum_fixup(le, l3hdr, th, tcp_data_len,
|
|
~csum);
|
|
th->th_sum = csum; /* Restore checksum on first packet. */
|
|
#endif
|
|
|
|
le->m_head = m;
|
|
le->m_tail = m_last(m);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* end */
|