[2/7] net: Introduce parse_protocol header_ops callback
diff mbox series

Message ID 20190114131841.1932-3-maximmi@mellanox.com
State Changes Requested
Delegated to: David Miller
Headers show
Series
  • AF_PACKET transport_offset fix
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Commit Message

Maxim Mikityanskiy Jan. 14, 2019, 1:18 p.m. UTC
Introduce a new optional header_ops callback called parse_protocol and a
wrapper function dev_parse_header_protocol, similar to dev_parse_header.

The new callback's purpose is to extract the protocol number from the L2
header, the format of which is known to the driver, but not to the upper
layers of the stack.

Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
---
 include/linux/netdevice.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

Patch
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diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 1377d085ef99..44b12430b0a7 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -274,6 +274,7 @@  struct header_ops {
 				const struct net_device *dev,
 				const unsigned char *haddr);
 	bool	(*validate)(const char *ll_header, unsigned int len);
+	__be16	(*parse_protocol)(const struct sk_buff *skb);
 };
 
 /* These flag bits are private to the generic network queueing
@@ -2928,6 +2929,15 @@  static inline int dev_parse_header(const struct sk_buff *skb,
 	return dev->header_ops->parse(skb, haddr);
 }
 
+static inline __be16 dev_parse_header_protocol(const struct sk_buff *skb)
+{
+	const struct net_device *dev = skb->dev;
+
+	if (!dev->header_ops || !dev->header_ops->parse_protocol)
+		return 0;
+	return dev->header_ops->parse_protocol(skb);
+}
+
 /* ll_header must have at least hard_header_len allocated */
 static inline bool dev_validate_header(const struct net_device *dev,
 				       char *ll_header, int len)