write in 30M

hc

2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/include/linux/if_vlan.h
..
..
@@ -626,6 +626,23 @@
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 	return __vlan_get_protocol(skb, skb->protocol, NULL);
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 }
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+/* This version of __vlan_get_protocol() also pulls mac header in skb->head */
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+static inline __be16 vlan_get_protocol_and_depth(struct sk_buff *skb,
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+						 __be16 type, int *depth)
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+{
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+	int maclen;
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+
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+	type = __vlan_get_protocol(skb, type, &maclen);
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+
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+	if (type) {
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+		if (!pskb_may_pull(skb, maclen))
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+			type = 0;
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+		else if (depth)
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+			*depth = maclen;
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+	}
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+	return type;
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+}
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+
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 /* A getter for the SKB protocol field which will handle VLAN tags consistently
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  * whether VLAN acceleration is enabled or not.
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  */