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/*-
* Copyright (c) 2007, Myricom Inc.
* Copyright (c) 2008, Intel Corporation.
* Copyright (c) 2012 The FreeBSD Foundation
* All rights reserved.
*
* Portions of this software were developed by Bjoern Zeeb
* under sponsorship from the FreeBSD Foundation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/netinet/tcp_lro.c 238244 2012-07-08 12:39:02Z bz $");
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/ethernet.h>
#include <net/vnet.h>
#include <netinet/in_systm.h>
#include <netinet/in.h>
#include <netinet/ip6.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_lro.h>
#include <netinet6/ip6_var.h>
#include <machine/in_cksum.h>
#ifndef LRO_ENTRIES
#define LRO_ENTRIES 8 /* # of LRO entries per RX queue. */
#endif
#define TCP_LRO_UPDATE_CSUM 1
#ifndef TCP_LRO_UPDATE_CSUM
#define TCP_LRO_INVALID_CSUM 0x0000
#endif
int
tcp_lro_init(struct lro_ctrl *lc)
{
struct lro_entry *le;
int error, i;
lc->lro_bad_csum = 0;
lc->lro_queued = 0;
lc->lro_flushed = 0;
lc->lro_cnt = 0;
SLIST_INIT(&lc->lro_free);
SLIST_INIT(&lc->lro_active);
error = 0;
for (i = 0; i < LRO_ENTRIES; i++) {
le = (struct lro_entry *)malloc(sizeof(*le), M_DEVBUF,
M_NOWAIT | M_ZERO);
if (le == NULL) {
if (i == 0)
error = ENOMEM;
break;
}
lc->lro_cnt = i + 1;
SLIST_INSERT_HEAD(&lc->lro_free, le, next);
}
return (error);
}
void
tcp_lro_free(struct lro_ctrl *lc)
{
struct lro_entry *le;
while (!SLIST_EMPTY(&lc->lro_free)) {
le = SLIST_FIRST(&lc->lro_free);
SLIST_REMOVE_HEAD(&lc->lro_free, next);
free(le, M_DEVBUF);
}
}
#ifdef TCP_LRO_UPDATE_CSUM
static uint16_t
tcp_lro_csum_th(struct tcphdr *th)
{
uint32_t ch;
uint16_t *p, l;
ch = th->th_sum = 0x0000;
l = th->th_off;
p = (uint16_t *)th;
while (l > 0) {
ch += *p;
p++;
ch += *p;
p++;
l--;
}
while (ch > 0xffff)
ch = (ch >> 16) + (ch & 0xffff);
return (ch & 0xffff);
}
static uint16_t
tcp_lro_rx_csum_fixup(struct lro_entry *le, void *l3hdr, struct tcphdr *th,
uint16_t tcp_data_len, uint16_t csum)
{
uint32_t c;
uint16_t cs;
c = csum;
/* Remove length from checksum. */
switch (le->eh_type) {
#ifdef INET6
case ETHERTYPE_IPV6:
{
struct ip6_hdr *ip6;
ip6 = (struct ip6_hdr *)l3hdr;
if (le->append_cnt == 0)
cs = ip6->ip6_plen;
else {
uint32_t cx;
cx = ntohs(ip6->ip6_plen);
cs = in6_cksum_pseudo(ip6, cx, ip6->ip6_nxt, 0);
}
break;
}
#endif
#ifdef INET
case ETHERTYPE_IP:
{
struct ip *ip4;
ip4 = (struct ip *)l3hdr;
if (le->append_cnt == 0)
cs = ip4->ip_len;
else {
cs = in_addword(ntohs(ip4->ip_len) - sizeof(*ip4),
IPPROTO_TCP);
cs = in_pseudo(ip4->ip_src.s_addr, ip4->ip_dst.s_addr,
htons(cs));
}
break;
}
#endif
default:
cs = 0; /* Keep compiler happy. */
}
cs = ~cs;
c += cs;
/* Remove TCP header csum. */
cs = ~tcp_lro_csum_th(th);
c += cs;
while (c > 0xffff)
c = (c >> 16) + (c & 0xffff);
return (c & 0xffff);
}
#endif
void
tcp_lro_flush(struct lro_ctrl *lc, struct lro_entry *le)
{
if (le->append_cnt > 0) {
struct tcphdr *th;
uint16_t p_len;
p_len = htons(le->p_len);
switch (le->eh_type) {
#ifdef INET6
case ETHERTYPE_IPV6:
{
struct ip6_hdr *ip6;
ip6 = le->le_ip6;
ip6->ip6_plen = p_len;
th = (struct tcphdr *)(ip6 + 1);
le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
CSUM_PSEUDO_HDR;
le->p_len += ETHER_HDR_LEN + sizeof(*ip6);
break;
}
#endif
#ifdef INET
case ETHERTYPE_IP:
{
struct ip *ip4;
#ifdef TCP_LRO_UPDATE_CSUM
uint32_t cl;
uint16_t c;
#endif
ip4 = le->le_ip4;
#ifdef TCP_LRO_UPDATE_CSUM
/* Fix IP header checksum for new length. */
c = ~ip4->ip_sum;
cl = c;
c = ~ip4->ip_len;
cl += c + p_len;
while (cl > 0xffff)
cl = (cl >> 16) + (cl & 0xffff);
c = cl;
ip4->ip_sum = ~c;
#else
ip4->ip_sum = TCP_LRO_INVALID_CSUM;
#endif
ip4->ip_len = p_len;
th = (struct tcphdr *)(ip4 + 1);
le->m_head->m_pkthdr.csum_flags = CSUM_DATA_VALID |
CSUM_PSEUDO_HDR | CSUM_IP_CHECKED | CSUM_IP_VALID;
le->p_len += ETHER_HDR_LEN;
break;
}
#endif
default:
th = NULL; /* Keep compiler happy. */
}
le->m_head->m_pkthdr.csum_data = 0xffff;
le->m_head->m_pkthdr.len = le->p_len;
/* Incorporate the latest ACK into the TCP header. */
th->th_ack = le->ack_seq;
th->th_win = le->window;
/* Incorporate latest timestamp into the TCP header. */
if (le->timestamp != 0) {
uint32_t *ts_ptr;
ts_ptr = (uint32_t *)(th + 1);
ts_ptr[1] = htonl(le->tsval);
ts_ptr[2] = le->tsecr;
}
#ifdef TCP_LRO_UPDATE_CSUM
/* Update the TCP header checksum. */
le->ulp_csum += p_len;
le->ulp_csum += tcp_lro_csum_th(th);
while (le->ulp_csum > 0xffff)
le->ulp_csum = (le->ulp_csum >> 16) +
(le->ulp_csum & 0xffff);
th->th_sum = (le->ulp_csum & 0xffff);
th->th_sum = ~th->th_sum;
#else
th->th_sum = TCP_LRO_INVALID_CSUM;
#endif
}
(*lc->ifp->if_input)(lc->ifp, le->m_head);
lc->lro_queued += le->append_cnt + 1;
lc->lro_flushed++;
bzero(le, sizeof(*le));
SLIST_INSERT_HEAD(&lc->lro_free, le, next);
}
#ifdef INET6
static int
tcp_lro_rx_ipv6(struct lro_ctrl *lc, struct mbuf *m, struct ip6_hdr *ip6,
struct tcphdr **th)
{
/* XXX-BZ we should check the flow-label. */
/* XXX-BZ We do not yet support ext. hdrs. */
if (ip6->ip6_nxt != IPPROTO_TCP)
return (TCP_LRO_NOT_SUPPORTED);
/* Find the TCP header. */
*th = (struct tcphdr *)(ip6 + 1);
return (0);
}
#endif
#ifdef INET
static int
tcp_lro_rx_ipv4(struct lro_ctrl *lc, struct mbuf *m, struct ip *ip4,
struct tcphdr **th)
{
int csum_flags;
uint16_t csum;
if (ip4->ip_p != IPPROTO_TCP)
return (TCP_LRO_NOT_SUPPORTED);
/* Ensure there are no options. */
if ((ip4->ip_hl << 2) != sizeof (*ip4))
return (TCP_LRO_CANNOT);
/* .. and the packet is not fragmented. */
if (ip4->ip_off & htons(IP_MF|IP_OFFMASK))
return (TCP_LRO_CANNOT);
/* Legacy IP has a header checksum that needs to be correct. */
csum_flags = m->m_pkthdr.csum_flags;
if (csum_flags & CSUM_IP_CHECKED) {
if (__predict_false((csum_flags & CSUM_IP_VALID) == 0)) {
lc->lro_bad_csum++;
return (TCP_LRO_CANNOT);
}
} else {
csum = in_cksum_hdr(ip4);
if (__predict_false((csum ^ 0xffff) != 0)) {
lc->lro_bad_csum++;
return (TCP_LRO_CANNOT);
}
}
/* Find the TCP header (we assured there are no IP options). */
*th = (struct tcphdr *)(ip4 + 1);
return (0);
}
#endif
int
tcp_lro_rx(struct lro_ctrl *lc, struct mbuf *m, uint32_t csum)
{
struct lro_entry *le;
struct ether_header *eh;
#ifdef INET6
struct ip6_hdr *ip6 = NULL; /* Keep compiler happy. */
#endif
#ifdef INET
struct ip *ip4 = NULL; /* Keep compiler happy. */
#endif
struct tcphdr *th;
void *l3hdr = NULL; /* Keep compiler happy. */
uint32_t *ts_ptr;
tcp_seq seq;
int error, ip_len, l;
uint16_t eh_type, tcp_data_len;
/* We expect a contiguous header [eh, ip, tcp]. */
eh = mtod(m, struct ether_header *);
eh_type = ntohs(eh->ether_type);
switch (eh_type) {
#ifdef INET6
case ETHERTYPE_IPV6:
{
CURVNET_SET(lc->ifp->if_vnet);
if (V_ip6_forwarding != 0) {
/* XXX-BZ stats but changing lro_ctrl is a problem. */
CURVNET_RESTORE();
return (TCP_LRO_CANNOT);
}
CURVNET_RESTORE();
l3hdr = ip6 = (struct ip6_hdr *)(eh + 1);
error = tcp_lro_rx_ipv6(lc, m, ip6, &th);
if (error != 0)
return (error);
tcp_data_len = ntohs(ip6->ip6_plen);
ip_len = sizeof(*ip6) + tcp_data_len;
break;
}
#endif
#ifdef INET
case ETHERTYPE_IP:
{
CURVNET_SET(lc->ifp->if_vnet);
if (V_ipforwarding != 0) {
/* XXX-BZ stats but changing lro_ctrl is a problem. */
CURVNET_RESTORE();
return (TCP_LRO_CANNOT);
}
CURVNET_RESTORE();
l3hdr = ip4 = (struct ip *)(eh + 1);
error = tcp_lro_rx_ipv4(lc, m, ip4, &th);
if (error != 0)
return (error);
ip_len = ntohs(ip4->ip_len);
tcp_data_len = ip_len - sizeof(*ip4);
break;
}
#endif
/* XXX-BZ what happens in case of VLAN(s)? */
default:
return (TCP_LRO_NOT_SUPPORTED);
}
/*
* If the frame is padded beyond the end of the IP packet, then we must
* trim the extra bytes off.
*/
l = m->m_pkthdr.len - (ETHER_HDR_LEN + ip_len);
if (l != 0) {
if (l < 0)
/* Truncated packet. */
return (TCP_LRO_CANNOT);
m_adj(m, -l);
}
/*
* Check TCP header constraints.
*/
/* Ensure no bits set besides ACK or PSH. */
if ((th->th_flags & ~(TH_ACK | TH_PUSH)) != 0)
return (TCP_LRO_CANNOT);
/* XXX-BZ We lose a AKC|PUSH flag concatinating multiple segments. */
/* XXX-BZ Ideally we'd flush on PUSH? */
/*
* Check for timestamps.
* Since the only option we handle are timestamps, we only have to
* handle the simple case of aligned timestamps.
*/
l = (th->th_off << 2);
tcp_data_len -= l;
l -= sizeof(*th);
ts_ptr = (uint32_t *)(th + 1);
if (l != 0 && (__predict_false(l != TCPOLEN_TSTAMP_APPA) ||
(*ts_ptr != ntohl(TCPOPT_NOP<<24|TCPOPT_NOP<<16|
TCPOPT_TIMESTAMP<<8|TCPOLEN_TIMESTAMP))))
return (TCP_LRO_CANNOT);
/* If the driver did not pass in the checksum, set it now. */
if (csum == 0x0000)
csum = th->th_sum;
seq = ntohl(th->th_seq);
/* Try to find a matching previous segment. */
SLIST_FOREACH(le, &lc->lro_active, next) {
if (le->eh_type != eh_type)
continue;
if (le->source_port != th->th_sport ||
le->dest_port != th->th_dport)
continue;
switch (eh_type) {
#ifdef INET6
case ETHERTYPE_IPV6:
if (bcmp(&le->source_ip6, &ip6->ip6_src,
sizeof(struct in6_addr)) != 0 ||
bcmp(&le->dest_ip6, &ip6->ip6_dst,
sizeof(struct in6_addr)) != 0)
continue;
break;
#endif
#ifdef INET
case ETHERTYPE_IP:
if (le->source_ip4 != ip4->ip_src.s_addr ||
le->dest_ip4 != ip4->ip_dst.s_addr)
continue;
break;
#endif
}
/* Flush now if appending will result in overflow. */
if (le->p_len > (65535 - tcp_data_len)) {
SLIST_REMOVE(&lc->lro_active, le, lro_entry, next);
tcp_lro_flush(lc, le);
break;
}
/* Try to append the new segment. */
if (__predict_false(seq != le->next_seq ||
(tcp_data_len == 0 && le->ack_seq == th->th_ack))) {
/* Out of order packet or duplicate ACK. */
SLIST_REMOVE(&lc->lro_active, le, lro_entry, next);
tcp_lro_flush(lc, le);
return (TCP_LRO_CANNOT);
}
if (l != 0) {
uint32_t tsval = ntohl(*(ts_ptr + 1));
/* Make sure timestamp values are increasing. */
/* XXX-BZ flip and use TSTMP_GEQ macro for this? */
if (__predict_false(le->tsval > tsval ||
*(ts_ptr + 2) == 0))
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 */