On Tue, Mar 19, 2024 at 10:54 AM Yonghong Song <yonghong.song@xxxxxxxxx> wrote:
>
> Introduce two libbpf API functions bpf_program__attach_sk_msg()
> and bpf_program__attach_sk_skb() which allow user to get a bpf_link
> for their corresponding programs.
>
> Signed-off-by: Yonghong Song <yonghong.song@xxxxxxxxx>
> ---
> tools/lib/bpf/libbpf.c | 14 ++++++++++++++
> tools/lib/bpf/libbpf.h | 4 ++++
> tools/lib/bpf/libbpf.map | 2 ++
> 3 files changed, 20 insertions(+)
>
> diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
> index 7d413415d0d5..1b8e1f47a5e6 100644
> --- a/tools/lib/bpf/libbpf.c
> +++ b/tools/lib/bpf/libbpf.c
> @@ -149,6 +149,8 @@ static const char * const link_type_name[] = {
> [BPF_LINK_TYPE_TCX] = "tcx",
> [BPF_LINK_TYPE_UPROBE_MULTI] = "uprobe_multi",
> [BPF_LINK_TYPE_NETKIT] = "netkit",
> + [BPF_LINK_TYPE_SK_MSG] = "sk_msg",
> + [BPF_LINK_TYPE_SK_SKB] = "sk_skb",
> };
>
> static const char * const map_type_name[] = {
> @@ -12493,6 +12495,18 @@ bpf_program__attach_netns(const struct bpf_program *prog, int netns_fd)
> return bpf_program_attach_fd(prog, netns_fd, "netns", NULL);
> }
>
> +struct bpf_link *
> +bpf_program__attach_sk_msg(const struct bpf_program *prog, int map_fd)
> +{
> + return bpf_program_attach_fd(prog, map_fd, "sk_msg", NULL);
> +}
> +
> +struct bpf_link *
> +bpf_program__attach_sk_skb(const struct bpf_program *prog, int map_fd)
> +{
> + return bpf_program_attach_fd(prog, map_fd, "sk_skb", NULL);
> +}
> +
> struct bpf_link *bpf_program__attach_xdp(const struct bpf_program *prog, int ifindex)
> {
> /* target_fd/target_ifindex use the same field in LINK_CREATE */
> diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
> index 7b510761f545..4a2c04a9c6c3 100644
> --- a/tools/lib/bpf/libbpf.h
> +++ b/tools/lib/bpf/libbpf.h
> @@ -784,6 +784,10 @@ bpf_program__attach_cgroup(const struct bpf_program *prog, int cgroup_fd);
> LIBBPF_API struct bpf_link *
> bpf_program__attach_netns(const struct bpf_program *prog, int netns_fd);
> LIBBPF_API struct bpf_link *
> +bpf_program__attach_sk_msg(const struct bpf_program *prog, int map_fd);
> +LIBBPF_API struct bpf_link *
> +bpf_program__attach_sk_skb(const struct bpf_program *prog, int map_fd);
> +LIBBPF_API struct bpf_link *
> bpf_program__attach_xdp(const struct bpf_program *prog, int ifindex);
> LIBBPF_API struct bpf_link *
> bpf_program__attach_freplace(const struct bpf_program *prog,
> diff --git a/tools/lib/bpf/libbpf.map b/tools/lib/bpf/libbpf.map
> index 86804fd90dd1..11a1ad798129 100644
> --- a/tools/lib/bpf/libbpf.map
> +++ b/tools/lib/bpf/libbpf.map
> @@ -410,6 +410,8 @@ LIBBPF_1.3.0 {
>
> LIBBPF_1.4.0 {
> global:
> + bpf_program__attach_sk_msg;
> + bpf_program__attach_sk_skb;
same suggestion, it seems like having a more generic
bpf_program__attach_sockmap() or something along those lines would be
better?
please also see what changes need to be done in bpf_link_create() API
> bpf_token_create;
> btf__new_split;
> btf_ext__raw_data;
> --
> 2.43.0
>
