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bpf: add get_netns_cookie helper to tc 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/20241007095958.97442-1-mahe.tardy@gmail.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Mahe Tardy 2024-10-07 09:59:57 +00:00 committed by Martin KaFai Lau
parent bc9b3fb827
commit eb62f49de7
1 changed files with 13 additions and 0 deletions
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13
net/core/filter.c
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@ -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 && 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: