@@ -55,7 +55,7 @@ uint16_t net_checksum_tcpudp(uint16_t length, uint16_t proto,
void net_checksum_calculate(uint8_t *data, int length)
{
- int ip_len;
+ int mac_hdr_len, ip_len;
struct ip_header *ip;
/*
@@ -64,12 +64,39 @@ void net_checksum_calculate(uint8_t *data, int length)
* struct members (just in case).
*/
- /* Ensure data has complete L2 & L3 headers. */
- if (length < (sizeof(struct eth_header) + sizeof(struct ip_header))) {
+ /* Ensure we have at least an Eth header */
+ if (length < sizeof(struct eth_header)) {
return;
}
- ip = (struct ip_header *)(data + sizeof(struct eth_header));
+ /* Handle the optionnal VLAN headers */
+ switch (lduw_be_p(&PKT_GET_ETH_HDR(data)->h_proto)) {
+ case ETH_P_VLAN:
+ mac_hdr_len = sizeof(struct eth_header) +
+ sizeof(struct vlan_header);
+ break;
+ case ETH_P_DVLAN:
+ if (lduw_be_p(&PKT_GET_VLAN_HDR(data)->h_proto) == ETH_P_VLAN) {
+ mac_hdr_len = sizeof(struct eth_header) +
+ 2 * sizeof(struct vlan_header);
+ } else {
+ mac_hdr_len = sizeof(struct eth_header) +
+ sizeof(struct vlan_header);
+ }
+ break;
+ default:
+ mac_hdr_len = sizeof(struct eth_header);
+ break;
+ }
+
+ length -= mac_hdr_len;
+
+ /* Now check we have an IP header (with an optionnal VLAN header) */
+ if (length < sizeof(struct ip_header)) {
+ return;
+ }
+
+ ip = (struct ip_header *)(data + mac_hdr_len);
if (IP_HEADER_VERSION(ip) != IP_HEADER_VERSION_4) {
return; /* not IPv4 */
Signed-off-by: Jean-Christophe Dubois <jcd@tribudubois.net> --- Changes since v1: * Not present on v1 Changes since v2: * Not present on v2 Changes since v3: * local variable name change. Changes since v4: * None net/checksum.c | 35 +++++++++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 4 deletions(-)