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

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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: Andrea Mayer <andrea.mayer@uniroma2.it>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Andrea Mayer 2020-12-02 14:05:13 +01:00 committed by Jakub Kicinski
parent 0a3021f1d4
commit cfdf64a034
1 changed files with 49 additions and 0 deletions
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49
net/ipv6/seg6_local.c
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@ -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;