Commit 6cf1770d authored by Xu Liu's avatar Xu Liu Committed by Daniel Borkmann
Browse files

bpf: Allow bpf_get_netns_cookie in BPF_PROG_TYPE_SOCK_OPS 



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

Signed-off-by: default avatarXu Liu <liuxu623@gmail.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarSong Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20210818105820.91894-2-liuxu623@gmail.com
parent d20b4111

net/core/filter.c

+14 −0
Original line number Diff line number Diff line
@@ -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;