u8 *p_message_type,
u16 *p_sequence_id)
{
- unsigned int offset = 0;
unsigned int ptp_class;
- u8 *data;
+ struct ptp_header *hdr;
- data = skb_mac_header(skb);
ptp_class = ptp_classify_raw(skb);
switch (ptp_class & PTP_CLASS_VMASK) {
return -ERANGE;
}
- if (ptp_class & PTP_CLASS_VLAN)
- offset += VLAN_HLEN;
-
- switch (ptp_class & PTP_CLASS_PMASK) {
- case PTP_CLASS_IPV4:
- offset += ETH_HLEN + IPV4_HLEN(data + offset) + UDP_HLEN;
- break;
- case PTP_CLASS_IPV6:
- offset += ETH_HLEN + IP6_HLEN + UDP_HLEN;
- break;
- case PTP_CLASS_L2:
- offset += ETH_HLEN;
- break;
- default:
- return -ERANGE;
- }
-
- /* PTP header is 34 bytes. */
- if (skb->len < offset + 34)
+ hdr = ptp_parse_header(skb, ptp_class);
+ if (!hdr)
return -EINVAL;
- *p_message_type = data[offset] & 0x0f;
- *p_domain_number = data[offset + 4];
- *p_sequence_id = (u16)(data[offset + 30]) << 8 | data[offset + 31];
+ *p_message_type = ptp_get_msgtype(hdr, ptp_class);
+ *p_domain_number = hdr->domain_number;
+ *p_sequence_id = be16_to_cpu(hdr->sequence_id);
+
return 0;
}