KFunc bpf_ct_insert_entry
Add the provided entry into a CT map
Definition
This must be invoked for referenced PTR_TO_BTF_ID.
Parameters
nfct__ref: Pointer to referenced nf_conn___init object, obtained using bpf_xdp_ct_alloc or bpf_skb_ct_alloc.
struct nf_conn *bpf_ct_insert_entry(struct nf_conn___init *nfct_i)
Note
This kfunc returns a pointer to a refcounted object. The verifier will then ensure that the pointer to the object
is eventually released using a release kfunc, or transferred to a map using a referenced kptr
(by invoking bpf_kptr_xchg). If not, the verifier fails the
loading of the BPF program until no lingering references remain in all possible explored states of the program.
Note
The pointer returned by the kfunc may be NULL. Hence, it forces the user to do a NULL check on the pointer returned from the kfunc before making use of it (dereferencing or passing to another helper).
Note
This kfunc releases the pointer passed in to it. There can be only one referenced pointer that can be passed in. All copies of the pointer being released are invalidated as a result of invoking this kfunc.
Usage
Docs could be improved
This part of the docs is incomplete, contributions are very welcome
Program types
The following program types can make use of this kfunc:
Example
See bpf_ct_set_nat_info for an example of how to use this kfunc.