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-rw-r--r--lib/ipv4.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/ipv4.h b/lib/ipv4.h
index de9f4e5..add406b 100644
--- a/lib/ipv4.h
+++ b/lib/ipv4.h
@@ -51,6 +51,7 @@ typedef u32 ip_addr;
#define ipa_hton(x) x = _MI(htonl(_I(x)))
#define ipa_ntoh(x) x = _MI(ntohl(_I(x)))
#define ipa_classify(x) ipv4_classify(_I(x))
+#define ipa_opposite(x) _MI(_I(x) ^ 1)
int ipv4_classify(u32);