diff mbox series

[bpf-next,1/2] bpf: add get_netns_cookie helper to tc programs

Message ID 20241002160122.148980-1-mahe.tardy@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series [bpf-next,1/2] bpf: add get_netns_cookie helper to tc programs | expand

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netdev/series_format success Single patches do not need cover letters
netdev/tree_selection success Clearly marked for bpf-next
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 9 this patch: 9
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers warning 13 maintainers not CCed: pabeni@redhat.com andrii@kernel.org kuba@kernel.org edumazet@google.com netdev@vger.kernel.org sdf@fomichev.me haoluo@google.com eddyz87@gmail.com jolsa@kernel.org song@kernel.org yonghong.song@linux.dev ast@kernel.org kpsingh@kernel.org
netdev/build_clang success Errors and warnings before: 7 this patch: 7
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 33 this patch: 33
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 25 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 6 this patch: 6
netdev/source_inline success Was 0 now: 0

Commit Message

Mahe Tardy Oct. 2, 2024, 4:01 p.m. UTC 
This is needed in the context of Cilium and Tetragon to retrieve netns
cookie from hostns when traffic leaves Pod, so that we can correlate
skb->sk's netns cookie.

Signed-off-by: Mahe Tardy <mahe.tardy@gmail.com>
---
 net/core/filter.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

--
2.34.1
diff mbox series

Patch

diff --git a/net/core/filter.c b/net/core/filter.c
index cd3524cb326b..6e80991125ba 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5138,6 +5138,17 @@  static u64 __bpf_get_netns_cookie(struct sock *sk)
 	return net->net_cookie;
 }

+BPF_CALL_1(bpf_get_netns_cookie, struct sk_buff *, skb)
+{
+	return __bpf_get_netns_cookie(skb->sk ? skb->sk : NULL);
+}
+
+static const struct bpf_func_proto bpf_get_netns_cookie_proto = {
+	.func           = bpf_get_netns_cookie,
+	.ret_type       = RET_INTEGER,
+	.arg1_type      = ARG_PTR_TO_CTX_OR_NULL,
+};
+
 BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx)
 {
 	return __bpf_get_netns_cookie(ctx);
@@ -8209,6 +8220,8 @@  tc_cls_act_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 		return &bpf_skb_under_cgroup_proto;
 	case BPF_FUNC_get_socket_cookie:
 		return &bpf_get_socket_cookie_proto;
+	case BPF_FUNC_get_netns_cookie:
+		return &bpf_get_netns_cookie_proto;
 	case BPF_FUNC_get_socket_uid:
 		return &bpf_get_socket_uid_proto;
 	case BPF_FUNC_fib_lookup: