[PATCH bpf-next] kernel/bpf/verifier: fix build when NET is not enabled

[Randy Dunlap]

Fix build errors in kernel/bpf/verifier.c when CONFIG_NET is
not enabled.

../kernel/bpf/verifier.c:3995:13: error: ‘btf_sock_ids’ undeclared here (not in a function); did you mean ‘bpf_sock_ops’?
  .btf_id = &btf_sock_ids[BTF_SOCK_TYPE_SOCK_COMMON],

../kernel/bpf/verifier.c:3995:26: error: ‘BTF_SOCK_TYPE_SOCK_COMMON’ undeclared here (not in a function); did you mean ‘PTR_TO_SOCK_COMMON’?
  .btf_id = &btf_sock_ids[BTF_SOCK_TYPE_SOCK_COMMON],

Fixes: 1df8f55a37bd ("bpf: Enable bpf_skc_to_* sock casting helper to networking prog type")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: bpf@xxxxxxxxxxxxxxx
Cc: Martin KaFai Lau <kafai@xxxxxx>
Cc: linux-next@xxxxxxxxxxxxxxx
---
First reported by me in linux-next-20200928.

 kernel/bpf/verifier.c |    4 ++++
 1 file changed, 4 insertions(+)

--- mmotm-2020-1006-1550.orig/kernel/bpf/verifier.c
+++ mmotm-2020-1006-1550/kernel/bpf/verifier.c
@@ -3984,6 +3984,7 @@ static const struct bpf_reg_types sock_t
 	},
 };
 
+#ifdef CONFIG_NET
 static const struct bpf_reg_types btf_id_sock_common_types = {
 	.types = {
 		PTR_TO_SOCK_COMMON,
@@ -3994,6 +3995,7 @@ static const struct bpf_reg_types btf_id
 	},
 	.btf_id = &btf_sock_ids[BTF_SOCK_TYPE_SOCK_COMMON],
 };
+#endif
 
 static const struct bpf_reg_types mem_types = {
 	.types = {
@@ -4037,7 +4039,9 @@ static const struct bpf_reg_types *compa
 	[ARG_PTR_TO_CTX]		= &context_types,
 	[ARG_PTR_TO_CTX_OR_NULL]	= &context_types,
 	[ARG_PTR_TO_SOCK_COMMON]	= &sock_types,
+#ifdef CONFIG_NET
 	[ARG_PTR_TO_BTF_ID_SOCK_COMMON]	= &btf_id_sock_common_types,
+#endif
 	[ARG_PTR_TO_SOCKET]		= &fullsock_types,
 	[ARG_PTR_TO_SOCKET_OR_NULL]	= &fullsock_types,
 	[ARG_PTR_TO_BTF_ID]		= &btf_ptr_types,