When CONFIG_NET is set but CONFIG_INET isn't, build fails with:
ld: kernel/bpf/net_namespace.o: in function `netns_bpf_attach_type_unneed':
kernel/bpf/net_namespace.c:32: undefined reference to `bpf_sk_lookup_enabled'
ld: kernel/bpf/net_namespace.o: in function `netns_bpf_attach_type_need':
kernel/bpf/net_namespace.c:43: undefined reference to `bpf_sk_lookup_enabled'
This is because without CONFIG_INET bpf_sk_lookup_enabled symbol is not
available. Wrap references to bpf_sk_lookup_enabled with preprocessor
conditionals.
Fixes: 1559b4aa1db4 ("inet: Run SK_LOOKUP BPF program on socket lookup")
Reported-by: Randy Dunlap <[email protected]>
Reported-by: Stephen Rothwell <[email protected]>
Signed-off-by: Jakub Sitnicki <[email protected]>
---
kernel/bpf/net_namespace.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/bpf/net_namespace.c b/kernel/bpf/net_namespace.c
index 4e1bcaa2c3cb..71405edd667c 100644
--- a/kernel/bpf/net_namespace.c
+++ b/kernel/bpf/net_namespace.c
@@ -28,9 +28,11 @@ DEFINE_MUTEX(netns_bpf_mutex);
static void netns_bpf_attach_type_unneed(enum netns_bpf_attach_type type)
{
switch (type) {
+#ifdef CONFIG_INET
case NETNS_BPF_SK_LOOKUP:
static_branch_dec(&bpf_sk_lookup_enabled);
break;
+#endif
default:
break;
}
@@ -39,9 +41,11 @@ static void netns_bpf_attach_type_unneed(enum
netns_bpf_attach_type type)
static void netns_bpf_attach_type_need(enum netns_bpf_attach_type type)
{
switch (type) {
+#ifdef CONFIG_INET
case NETNS_BPF_SK_LOOKUP:
static_branch_inc(&bpf_sk_lookup_enabled);
break;
+#endif
default:
break;
}
--
2.25.4
