Classifiers

Collaboration diagram for Classifiers:

Modules
	Basic Classifier
	Extended Match
	Classifier Modules
	Classifier Object

Classifier Addition/Modification/Deletion
int	rtnl_cls_build_add_request (struct rtnl_cls *cls, int flags, struct nl_msg **result)
	Build a netlink message to add a new classifier. More...
int	rtnl_cls_add (struct nl_sock *sk, struct rtnl_cls *cls, int flags)
	Add a new classifier. More...
int	rtnl_cls_build_change_request (struct rtnl_cls *cls, int flags, struct nl_msg **result)
	Build a netlink message to change classifier attributes. More...
int	rtnl_cls_change (struct nl_sock *sk, struct rtnl_cls *cls, int flags)
	Change a classifier. More...
int	rtnl_cls_build_delete_request (struct rtnl_cls *cls, int flags, struct nl_msg **result)
	Build a netlink request message to delete a classifier. More...
int	rtnl_cls_delete (struct nl_sock *sk, struct rtnl_cls *cls, int flags)
	Delete a classifier. More...

Cache Management
int	rtnl_cls_alloc_cache (struct nl_sock *sk, int ifindex, uint32_t parent, struct nl_cache **result)
	Build a classifier cache including all classifiers attached to the specified class/qdisc on eht specified interface. More...

Detailed Description

Classifier Identification

• protocol
• priority
• parent
• interface
• kind
• handle

Function Documentation

int rtnl_cls_add	(	struct nl_sock *	sk,
		struct rtnl_cls *	cls,
		int	flags
	)

Add a new classifier.

• sk Netlink socket.
• cls classifier to add
• flags additional netlink message flags

Builds a netlink message by calling rtnl_cls_build_add_request(), sends the request to the kernel and waits for the next ACK to be received and thus blocks until the request has been processed.

Returns

0 on sucess or a negative error if an error occured.

References nl_send_auto_complete(), nl_wait_for_ack(), nlmsg_free(), and rtnl_cls_build_add_request().

Referenced by main().

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int rtnl_cls_alloc_cache	(	struct nl_sock *	sk,
		int	ifindex,
		uint32_t	parent,
		struct nl_cache **	result
	)

Build a classifier cache including all classifiers attached to the specified class/qdisc on eht specified interface.

• sk Netlink socket.
• ifindex interface index of the link the classes are attached to.
• parent parent qdisc/class
• result Pointer to store resulting cache.

Allocates a new cache, initializes it properly and updates it to include all classes attached to the specified interface.

Note

The caller is responsible for destroying and freeing the cache after using it.

Returns

0 on success or a negative error code.

References nl_cache::c_iarg1, nl_cache::c_iarg2, nl_cache_alloc(), nl_cache_free(), nl_cache_refill(), and NLE_NOMEM.

Referenced by main().

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int rtnl_cls_build_add_request	(	struct rtnl_cls *	cls,
		int	flags,
		struct nl_msg **	result
	)

Build a netlink message to add a new classifier.

• cls classifier to add
• flags additional netlink message flags
• result Pointer to store resulting message.

Builds a new netlink message requesting an addition of a classifier The netlink message header isn't fully equipped with all relevant fields and must be sent out via nl_send_auto_complete() or supplemented as needed. classifier must contain the attributes of the new classifier set via rtnl_cls_set_* functions. opts may point to the clsasifier specific options.

Returns

0 on success or a negative error code.

References NLM_F_CREATE, and RTM_NEWTFILTER.

Referenced by rtnl_cls_add().

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int rtnl_cls_build_change_request	(	struct rtnl_cls *	cls,
		int	flags,
		struct nl_msg **	result
	)

Build a netlink message to change classifier attributes.

• cls classifier to change
• flags additional netlink message flags
• result Pointer to store resulting message.

Builds a new netlink message requesting a change of a neigh attributes. The netlink message header isn't fully equipped with all relevant fields and must thus be sent out via nl_send_auto_complete() or supplemented as needed.

Returns

0 on success or a negative error code.

References NLM_F_REPLACE, and RTM_NEWTFILTER.

Referenced by rtnl_cls_change().

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int rtnl_cls_build_delete_request	(	struct rtnl_cls *	cls,
		int	flags,
		struct nl_msg **	result
	)

Build a netlink request message to delete a classifier.

• cls classifier to delete
• flags additional netlink message flags
• result Pointer to store resulting message.

Builds a new netlink message requesting a deletion of a classifier. The netlink message header isn't fully equipped with all relevant fields and must thus be sent out via nl_send_auto_complete() or supplemented as needed.

Returns

0 on success or a negative error code.

References RTM_DELTFILTER.

Referenced by rtnl_cls_delete().

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int rtnl_cls_change	(	struct nl_sock *	sk,
		struct rtnl_cls *	cls,
		int	flags
	)

Change a classifier.

• sk Netlink socket.
• cls classifier to change
• flags additional netlink message flags

Builds a netlink message by calling rtnl_cls_build_change_request(), sends the request to the kernel and waits for the next ACK to be received and thus blocks until the request has been processed.

Returns

0 on sucess or a negative error if an error occured.

References nl_send_auto_complete(), nl_wait_for_ack(), nlmsg_free(), and rtnl_cls_build_change_request().

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int rtnl_cls_delete	(	struct nl_sock *	sk,
		struct rtnl_cls *	cls,
		int	flags
	)

Delete a classifier.

• sk Netlink socket.
• cls classifier to delete
• flags additional netlink message flags

Builds a netlink message by calling rtnl_cls_build_delete_request(), sends the request to the kernel and waits for the next ACK to be received and thus blocks until the request has been processed.

Returns

0 on sucess or a negative error if an error occured.

References nl_send_auto_complete(), nl_wait_for_ack(), nlmsg_free(), and rtnl_cls_build_delete_request().

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