Commit cfdf64a0 authored by Andrea Mayer's avatar Andrea Mayer Committed by Jakub Kicinski
Browse files

seg6: add callbacks for customizing the creation/destruction of a behavior 



We introduce two callbacks used for customizing the creation/destruction of
a SRv6 behavior. Such callbacks are defined in the new struct
seg6_local_lwtunnel_ops and hereafter we provide a brief description of
them:

 - build_state(...): used for calling the custom constructor of the
   behavior during its initialization phase and after all the attributes
   have been parsed successfully;

 - destroy_state(...): used for calling the custom destructor of the
   behavior before it is completely destroyed.

Signed-off-by: default avatarAndrea Mayer <andrea.mayer@uniroma2.it>
Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 0a3021f1

net/ipv6/seg6_local.c

+49 −0
Original line number Diff line number Diff line
@@ -33,6 +33,13 @@ 


struct seg6_local_lwt;



/* callbacks used for customizing the creation and destruction of a behavior */

struct seg6_local_lwtunnel_ops {

	int (*build_state)(struct seg6_local_lwt *slwt, const void *cfg,

			   struct netlink_ext_ack *extack);

	void (*destroy_state)(struct seg6_local_lwt *slwt);

};



struct seg6_action_desc {

	int action;

	unsigned long attrs;
@@ -53,6 +60,8 @@ struct seg6_action_desc { 


	int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt);

	int static_headroom;



	struct seg6_local_lwtunnel_ops slwt_ops;

};



struct bpf_lwt_prog {
@@ -1055,6 +1064,38 @@ parse_optattrs_err: 
	return err;

}



/* call the custom constructor of the behavior during its initialization phase

 * and after that all its attributes have been parsed successfully.

 */

static int

seg6_local_lwtunnel_build_state(struct seg6_local_lwt *slwt, const void *cfg,

				struct netlink_ext_ack *extack)

{

	struct seg6_action_desc *desc = slwt->desc;

	struct seg6_local_lwtunnel_ops *ops;



	ops = &desc->slwt_ops;

	if (!ops->build_state)

		return 0;



	return ops->build_state(slwt, cfg, extack);

}



/* call the custom destructor of the behavior which is invoked before the

 * tunnel is going to be destroyed.

 */

static void seg6_local_lwtunnel_destroy_state(struct seg6_local_lwt *slwt)

{

	struct seg6_action_desc *desc = slwt->desc;

	struct seg6_local_lwtunnel_ops *ops;



	ops = &desc->slwt_ops;

	if (!ops->destroy_state)

		return;



	ops->destroy_state(slwt);

}



static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt)

{

	struct seg6_action_param *param;
@@ -1154,6 +1195,10 @@ static int seg6_local_build_state(struct net *net, struct nlattr *nla, 
	if (err < 0)

		goto out_free;



	err = seg6_local_lwtunnel_build_state(slwt, cfg, extack);

	if (err < 0)

		goto out_destroy_attrs;



	newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL;

	newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT;

	newts->headroom = slwt->headroom;
@@ -1162,6 +1207,8 @@ static int seg6_local_build_state(struct net *net, struct nlattr *nla, 


	return 0;



out_destroy_attrs:

	destroy_attrs(slwt);

out_free:

	kfree(newts);

	return err;
@@ -1171,6 +1218,8 @@ static void seg6_local_destroy_state(struct lwtunnel_state *lwt) 
{

	struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);



	seg6_local_lwtunnel_destroy_state(slwt);



	destroy_attrs(slwt);



	return;

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