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authorKurt Kanzenbach <kurt@linutronix.de>2020-08-18 12:32:43 +0200
committerDavid S. Miller <davem@davemloft.net>2020-08-19 16:07:49 -0700
commitbdfbb63c314a6fb7d27dddd62f5a3e4f062b92bb (patch)
tree40323ad304ef541518009a986fda4b571c0b0785 /net/core/ptp_classifier.c
parentf3ae59c0c01530ab48faf72cc678f92ad8aa7b4f (diff)
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ptp: Add generic ptp v2 header parsing function
Reason: A lot of the ptp drivers - which implement hardware time stamping - need specific fields such as the sequence id from the ptp v2 header. Currently all drivers implement that themselves. Introduce a generic function to retrieve a pointer to the start of the ptp v2 header. Suggested-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: Kurt Kanzenbach <kurt@linutronix.de> Reviewed-by: Richard Cochran <richardcochran@gmail.com> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> Reviewed-by: Russell King <rmk+kernel@armlinux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/ptp_classifier.c')
-rw-r--r--net/core/ptp_classifier.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/net/core/ptp_classifier.c b/net/core/ptp_classifier.c
index d964a5147f22..e33fde06d528 100644
--- a/net/core/ptp_classifier.c
+++ b/net/core/ptp_classifier.c
@@ -107,6 +107,36 @@ unsigned int ptp_classify_raw(const struct sk_buff *skb)
}
EXPORT_SYMBOL_GPL(ptp_classify_raw);
+struct ptp_header *ptp_parse_header(struct sk_buff *skb, unsigned int type)
+{
+ u8 *ptr = skb_mac_header(skb);
+
+ if (type & PTP_CLASS_VLAN)
+ ptr += VLAN_HLEN;
+
+ switch (type & PTP_CLASS_PMASK) {
+ case PTP_CLASS_IPV4:
+ ptr += IPV4_HLEN(ptr) + UDP_HLEN;
+ break;
+ case PTP_CLASS_IPV6:
+ ptr += IP6_HLEN + UDP_HLEN;
+ break;
+ case PTP_CLASS_L2:
+ break;
+ default:
+ return NULL;
+ }
+
+ ptr += ETH_HLEN;
+
+ /* Ensure that the entire header is present in this packet. */
+ if (ptr + sizeof(struct ptp_header) > skb->data + skb->len)
+ return NULL;
+
+ return (struct ptp_header *)ptr;
+}
+EXPORT_SYMBOL_GPL(ptp_parse_header);
+
void __init ptp_classifier_init(void)
{
static struct sock_filter ptp_filter[] __initdata = {