[PATCH bpf-next v2 3/6] libbpf: Add bpf_link support for BPF_PROG_TYPE_SK_{MSG,SKB}

[Yonghong Song <yonghong.song@linux.dev>]

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@linux.dev>
---
 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;
 		bpf_token_create;
 		btf__new_split;
 		btf_ext__raw_data;
-- 
2.43.0