*/
#include "qemu/osdep.h"
-#include "qemu-common.h"
#include "net/checksum.h"
#include "net/eth.h"
uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq)
{
- uint32_t sum = 0;
+ uint32_t sum1 = 0, sum2 = 0;
int i;
- for (i = seq; i < seq + len; i++) {
- if (i & 1) {
- sum += (uint32_t)buf[i - seq];
- } else {
- sum += (uint32_t)buf[i - seq] << 8;
- }
+ for (i = 0; i < len - 1; i += 2) {
+ sum1 += (uint32_t)buf[i];
+ sum2 += (uint32_t)buf[i + 1];
+ }
+ if (i < len) {
+ sum1 += (uint32_t)buf[i];
+ }
+
+ if (seq & 1) {
+ return sum1 + (sum2 << 8);
+ } else {
+ return sum2 + (sum1 << 8);
}
- return sum;
}
uint16_t net_checksum_finish(uint32_t sum)
{
while (sum>>16)
- sum = (sum & 0xFFFF)+(sum >> 16);
+ sum = (sum & 0xFFFF)+(sum >> 16);
return ~sum;
}
return net_checksum_finish(sum);
}
-void net_checksum_calculate(uint8_t *data, int length)
+void net_checksum_calculate(uint8_t *data, int length, int csum_flag)
{
int mac_hdr_len, ip_len;
struct ip_header *ip;
+ uint16_t csum;
/*
* Note: We cannot assume "data" is aligned, so the all code uses
return;
}
- /* Handle the optionnal VLAN headers */
+ /* Handle the optional VLAN headers */
switch (lduw_be_p(&PKT_GET_ETH_HDR(data)->h_proto)) {
case ETH_P_VLAN:
mac_hdr_len = sizeof(struct eth_header) +
length -= mac_hdr_len;
- /* Now check we have an IP header (with an optionnal VLAN header) */
+ /* Now check we have an IP header (with an optional VLAN header) */
if (length < sizeof(struct ip_header)) {
return;
}
return; /* not IPv4 */
}
+ /* Calculate IP checksum */
+ if (csum_flag & CSUM_IP) {
+ stw_he_p(&ip->ip_sum, 0);
+ csum = net_raw_checksum((uint8_t *)ip, IP_HDR_GET_LEN(ip));
+ stw_be_p(&ip->ip_sum, csum);
+ }
+
+ if (IP4_IS_FRAGMENT(ip)) {
+ return; /* a fragmented IP packet */
+ }
+
ip_len = lduw_be_p(&ip->ip_len);
/* Last, check that we have enough data for the all IP frame */
switch (ip->ip_p) {
case IP_PROTO_TCP:
{
- uint16_t csum;
+ if (!(csum_flag & CSUM_TCP)) {
+ return;
+ }
+
tcp_header *tcp = (tcp_header *)(ip + 1);
if (ip_len < sizeof(tcp_header)) {
}
case IP_PROTO_UDP:
{
- uint16_t csum;
+ if (!(csum_flag & CSUM_UDP)) {
+ return;
+ }
+
udp_header *udp = (udp_header *)(ip + 1);
if (ip_len < sizeof(udp_header)) {
net_checksum_add_iov(const struct iovec *iov, const unsigned int iov_cnt,
uint32_t iov_off, uint32_t size, uint32_t csum_offset)
{
- size_t iovec_off, buf_off;
+ size_t iovec_off;
unsigned int i;
uint32_t res = 0;
iovec_off = 0;
- buf_off = 0;
for (i = 0; i < iov_cnt && size; i++) {
if (iov_off < (iovec_off + iov[i].iov_len)) {
size_t len = MIN((iovec_off + iov[i].iov_len) - iov_off , size);
res += net_checksum_add_cont(len, chunk_buf, csum_offset);
csum_offset += len;
- buf_off += len;
iov_off += len;
size -= len;
}