net: fib_rules: decouple address families from real address families

Decouple the address family values used for fib_rules from the real
address families in socket.h. This allows to use fib_rules for
code that is not a real address family without increasing AF_MAX/NPROTO.

Values up to 127 are reserved for real address families and map directly
to the corresponding AF value, values starting from 128 are for other
uses. rtnetlink is changed to invoke the AF_UNSPEC dumpit/doit handlers
for these families.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 0 deletions

diff --git a/include/linux/fib_rules.h b/include/linux/fib_rules.h
index 51da65b68b85..405e41139a4d 100644
--- a/include/linux/fib_rules.h
+++ b/include/linux/fib_rules.h
@@ -15,6 +15,13 @@
 /* try to find source address in routing lookups */
 #define FIB_RULE_FIND_SADDR     0x00010000
 
+/* fib_rules families. values up to 127 are reserved for real address
+ * families, values above 128 may be used arbitrarily.
+ */
+#define FIB_RULES_IPV4          AF_INET
+#define FIB_RULES_IPV6          AF_INET6
+#define FIB_RULES_DECNET        AF_DECnet
+
 struct fib_rule_hdr {
         __u8            family;
         __u8            dst_len;