This patch provides support of TFC padding in ESP packets as specified by RFC 4303
Padding is added between payload and cipher padding to force packet size
To control TFC padding length, a new SADB extension structure is defined (struct sadb_x_sa_tfc_length, SADB_X_EXT_SA_TFC_LENGTH)
Received packets with TFC padding is already supported as it doesn't need any specific code
Sponsored by: Stormshield