Commit fab60e29 authored by Xu Liu's avatar Xu Liu Committed by Alexei Starovoitov
Browse files

bpf: Allow bpf_get_netns_cookie in BPF_PROG_TYPE_SK_MSG 



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

Signed-off-by: default avatarXu Liu <liuxu623@gmail.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20210820071712.52852-2-liuxu623@gmail.com
parent 8c0bb89e

net/core/filter.c

+14 −0
Original line number Diff line number Diff line
@@ -4688,6 +4688,18 @@ static const struct bpf_func_proto bpf_get_netns_cookie_sock_ops_proto = { 
	.arg1_type	= ARG_PTR_TO_CTX_OR_NULL,

};



BPF_CALL_1(bpf_get_netns_cookie_sk_msg, struct sk_msg *, ctx)

{

	return __bpf_get_netns_cookie(ctx ? ctx->sk : NULL);

}



static const struct bpf_func_proto bpf_get_netns_cookie_sk_msg_proto = {

	.func		= bpf_get_netns_cookie_sk_msg,

	.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);
@@ -7551,6 +7563,8 @@ sk_msg_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_sk_msg_proto;

#ifdef CONFIG_CGROUPS

	case BPF_FUNC_get_current_cgroup_id:

		return &bpf_get_current_cgroup_id_proto;