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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: dece8d2b78 ("uapi: add MACsec bits")
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Davide Caratti 2016-07-22 15:07:56 +02:00 committed by David S. Miller
parent baedbe5588
commit 2ccbe2cb79
2 changed files with 4 additions and 2 deletions
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4
drivers/net/macsec.c
View File

@ -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:

2
include/uapi/linux/if_macsec.h
View File

@ -26,6 +26,8 @@
#define MACSEC_MIN_ICV_LEN 8
#define MACSEC_MAX_ICV_LEN 32
/* upper limit for ICV length as recommended by IEEE802.1AE-2006 */
#define MACSEC_STD_ICV_LEN 16
enum macsec_attrs {
MACSEC_ATTR_UNSPEC,