X-Git-Url: https://gerrit.fd.io/r/gitweb?a=blobdiff_plain;f=src%2Fvnet%2Fipsec%2Fah.h;h=f74ad9b01c1ddbc6bceea9f71d80f661a4c6fe25;hb=611864f4bddf787aff3323f162da589b1b26529c;hp=37fc29a1ced55e45d0c31d47d464c57a9e4507c5;hpb=400ded36422689c1783e220a1846447bc0058234;p=vpp.git

diff --git a/src/vnet/ipsec/ah.h b/src/vnet/ipsec/ah.h
index 37fc29a1ced..f74ad9b01c1 100644
--- a/src/vnet/ipsec/ah.h
+++ b/src/vnet/ipsec/ah.h
@@ -49,6 +49,15 @@ typedef CLIB_PACKED (struct {
 }) ip6_and_ah_header_t;
 /* *INDENT-ON* */
 
+always_inline u8
+ah_calc_icv_padding_len (u8 icv_size, int is_ipv6)
+{
+  ASSERT (0 == is_ipv6 || 1 == is_ipv6);
+  const u8 req_multiple = 4 + 4 * is_ipv6;	// 4 for ipv4, 8 for ipv6
+  const u8 total_size = sizeof (ah_header_t) + icv_size;
+  return (req_multiple - total_size % req_multiple) % req_multiple;
+}
+
 #endif /* __AH_H__ */
 
 /*