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bpf: Allow bpf_get_netns_cookie in BPF_PROG_TYPE_SOCK_OPS

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We'd like to be able to identify netns from sockops hooks to
accelerate local process communication form different netns.

Signed-off-by: Xu Liu <liuxu623@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20210818105820.91894-2-liuxu623@gmail.com
This commit is contained in:
Xu Liu 2021-08-18 18:58:19 +08:00 • committed by Daniel Borkmann
parent d20b41115a
commit 6cf1770d63
1 changed files with 14 additions and 0 deletions
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14
net/core/filter.c
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@ -4676,6 +4676,18 @@ static const struct bpf_func_proto bpf_get_netns_cookie_sock_addr_proto = {
.arg1_type = ARG_PTR_TO_CTX_OR_NULL,
};
BPF_CALL_1(bpf_get_netns_cookie_sock_ops, struct bpf_sock_ops_kern *, ctx)
{
return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL);
}
static const struct bpf_func_proto bpf_get_netns_cookie_sock_ops_proto = {
.func = bpf_get_netns_cookie_sock_ops,
.gpl_only = false,
.ret_type = RET_INTEGER,
.arg1_type = ARG_PTR_TO_CTX_OR_NULL,
};
BPF_CALL_1(bpf_get_socket_uid, struct sk_buff *, skb)
{
struct sock *sk = sk_to_full_sk(skb->sk);
@ -7491,6 +7503,8 @@ sock_ops_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
return &bpf_sk_storage_get_proto;
case BPF_FUNC_sk_storage_delete:
return &bpf_sk_storage_delete_proto;
case BPF_FUNC_get_netns_cookie:
return &bpf_get_netns_cookie_sock_ops_proto;
#ifdef CONFIG_INET
case BPF_FUNC_load_hdr_opt:
return &bpf_sock_ops_load_hdr_opt_proto;