macsec: limit ICV length to 16 octets

IEEE 802.1AE-2006 standard recommends that the ICV element in a MACsec
frame should not exceed 16 octets: add MACSEC_STD_ICV_LEN in uapi
definitions accordingly, and avoid accepting configurations where the ICV
length exceeds the standard value. Leave definition of MACSEC_MAX_ICV_LEN
unchanged for backwards compatibility with userspace programs.

Fixes: dece8d2b78d1 ("uapi: add MACsec bits")
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 0cbb935078da..18cfb46c5911 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -510,7 +510,7 @@ static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
 }
 
 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
-#define MACSEC_NEEDED_TAILROOM MACSEC_MAX_ICV_LEN
+#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
 
 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
 {
@@ -3217,7 +3217,7 @@ static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
         case MACSEC_DEFAULT_CIPHER_ID:
         case MACSEC_DEFAULT_CIPHER_ALT:
                 if (icv_len < MACSEC_MIN_ICV_LEN ||
-                    icv_len > MACSEC_MAX_ICV_LEN)
+                    icv_len > MACSEC_STD_ICV_LEN)
                         return -EINVAL;
                 break;
         default: