include/linux/ptp_classify.h

1 /* SPDX-License-Identifier: GPL-2.0-or-later */
27 #define PTP_CLASS_PMASK	0x70 /* mask for the packet type field */
57 #define IPV4_HLEN(data) (((struct iphdr *)(data + OFF_IHL))->ihl << 2)
85  * ptp_classify_raw - classify a PTP packet
97  * ptp_parse_header - Get pointer to the PTP v2 header
112  * ptp_get_msgtype - Extract ptp message type from given header
128 		msgtype = hdr->control;  in ptp_get_msgtype()
130 		msgtype = hdr->tsmt & 0x0f;  in ptp_get_msgtype()
137  * ptp_check_diff8 - Computes new checksum (when altering a 64-bit field)
155  * ptp_header_update_correction - Update PTP header's correction field
163  * one-step P2P that does not already modify the correction field of Pdelay_Req
173 	/* previous correction value is required for checksum update. */  in ptp_header_update_correction()
174 	memcpy(&correction_old,  &hdr->correction, sizeof(correction_old));  in ptp_header_update_correction()
177 	put_unaligned_be64((u64)correction, &hdr->correction);  in ptp_header_update_correction()
183 		uhdr = (struct udphdr *)((char *)hdr - sizeof(struct udphdr));  in ptp_header_update_correction()
189 	/* update checksum */  in ptp_header_update_correction()
190 	uhdr->check = csum_fold(ptp_check_diff8(correction_old,  in ptp_header_update_correction()
191 						hdr->correction,  in ptp_header_update_correction()
192 						~csum_unfold(uhdr->check)));  in ptp_header_update_correction()
193 	if (!uhdr->check)  in ptp_header_update_correction()
194 		uhdr->check = CSUM_MANGLED_0;  in ptp_header_update_correction()
196 	skb->ip_summed = CHECKSUM_NONE;  in ptp_header_update_correction()
200  * ptp_msg_is_sync - Evaluates whether the given skb is a PTP Sync message
204  * This function evaluates whether the given skb is a PTP Sync message.
206  * Return: true if sync message, false otherwise