ipv4, fib: pass LOOPBACK_IFINDEX instead of 0 to flowi4_iif

[sfrench/cifs-2.6.git] / include / net / flow.h

diff --git a/include/net/flow.h b/include/net/flow.h
index 64fd24836650b7ea14a5c6ba8278066bbb21bf0d..8109a159d1b3ba5ced3aa6d2bc10b9f01d274520 100644 (file)
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -11,6 +11,14 @@
 #include <linux/in6.h>
 #include <linux/atomic.h>
 
+/*
+ * ifindex generation is per-net namespace, and loopback is
+ * always the 1st device in ns (see net_dev_init), thus any
+ * loopback device should get ifindex 1
+ */
+
+#define LOOPBACK_IFINDEX       1
+
 struct flowi_common {
        int     flowic_oif;
        int     flowic_iif;
@@ -80,7 +88,7 @@ static inline void flowi4_init_output(struct flowi4 *fl4, int oif,
                                      __be16 dport, __be16 sport)
 {
        fl4->flowi4_oif = oif;
-       fl4->flowi4_iif = 0;
+       fl4->flowi4_iif = LOOPBACK_IFINDEX;
        fl4->flowi4_mark = mark;
        fl4->flowi4_tos = tos;
        fl4->flowi4_scope = scope;