From: Xu Liu <liuxu623@gmail.com>
Date: Wed, 18 Aug 2021 18:58:19 +0800
Subject: bpf: Allow bpf_get_netns_cookie in BPF_PROG_TYPE_SOCK_OPS
Patch-mainline: v5.15-rc1
Git-commit: 6cf1770d63dd2d0d0d4048e7b3ee360336c072d9
References: jsc#PED-1377

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
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
 net/core/filter.c |   14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4693,6 +4693,18 @@ static const struct bpf_func_proto bpf_g
 	.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);
@@ -7508,6 +7520,8 @@ sock_ops_func_proto(enum bpf_func_id fun
 		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;