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bpf: add get_netns_cookie helper to cgroup_skb programs

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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>
Link: https://lore.kernel.org/r/20250225125031.258740-1-mahe.tardy@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Mahe Tardy 2025-02-25 12:50:30 +00:00 committed by Alexei Starovoitov
parent 4e4136c644
commit c221d3744a
1 changed files with 2 additions and 0 deletions
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2
net/core/filter.c
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@ -8075,6 +8075,8 @@ sk_filter_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_skb_load_bytes_relative_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_perf_event_output: