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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/net/core/ptp_classifier.c
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@@ -1,13 +1,5 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /* PTP classifier
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of version 2 of the GNU General Public
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- * License as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope that it will be useful, but
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- * WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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- * General Public License for more details.
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  */
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4
 
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 /* The below program is the bpf_asm (tools/net/) representation of
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@@ -115,6 +107,36 @@
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 }
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 EXPORT_SYMBOL_GPL(ptp_classify_raw);
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109
 
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+struct ptp_header *ptp_parse_header(struct sk_buff *skb, unsigned int type)
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+{
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+	u8 *ptr = skb_mac_header(skb);
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+
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+	if (type & PTP_CLASS_VLAN)
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+		ptr += VLAN_HLEN;
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+
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+	switch (type & PTP_CLASS_PMASK) {
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+	case PTP_CLASS_IPV4:
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+		ptr += IPV4_HLEN(ptr) + UDP_HLEN;
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+		break;
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+	case PTP_CLASS_IPV6:
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+		ptr += IP6_HLEN + UDP_HLEN;
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+		break;
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+	case PTP_CLASS_L2:
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+		break;
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+	default:
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+		return NULL;
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+	}
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+
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+	ptr += ETH_HLEN;
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+
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+	/* Ensure that the entire header is present in this packet. */
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+	if (ptr + sizeof(struct ptp_header) > skb->data + skb->len)
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+		return NULL;
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+
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+	return (struct ptp_header *)ptr;
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+}
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+EXPORT_SYMBOL_GPL(ptp_parse_header);
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+
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 void __init ptp_classifier_init(void)
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 {
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 	static struct sock_filter ptp_filter[] __initdata = {
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@@ -185,9 +207,10 @@
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 		{ 0x16,  0,  0, 0x00000000 },
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 		{ 0x06,  0,  0, 0x00000000 },
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 	};
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-	struct sock_fprog_kern ptp_prog = {
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-		.len = ARRAY_SIZE(ptp_filter), .filter = ptp_filter,
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-	};
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+	struct sock_fprog_kern ptp_prog;
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+
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+	ptp_prog.len = ARRAY_SIZE(ptp_filter);
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+	ptp_prog.filter = ptp_filter;
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 	BUG_ON(bpf_prog_create(&ptp_insns, &ptp_prog));
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 }