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-rw-r--r--src/shared/missing.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/src/shared/missing.h b/src/shared/missing.h
index a88d9e414b..bb4f8f23a8 100644
--- a/src/shared/missing.h
+++ b/src/shared/missing.h
@@ -527,3 +527,12 @@ static inline int setns(int fd, int nstype) {
#ifndef BPF_XOR
# define BPF_XOR 0xa0
#endif
+
+/* Note that LOOPBACK_IFINDEX is currently not exported by the
+ * kernel/glibc, but hardcoded internally by the kernel. However, as
+ * it is exported to userspace indirectly via rtnetlink and the
+ * ioctls, and made use of widely we define it here too, in a way that
+ * is compatible with the kernel's internal definition. */
+#ifndef LOOPBACK_IFINDEX
+#define LOOPBACK_IFINDEX 1
+#endif