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macsec: key identifier is 128 bits, not 64
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The MACsec standard mentions a key identifier for each key, but
doesn't specify anything about it, so I arbitrarily chose 64 bits.

IEEE 802.1X-2010 specifies MKA (MACsec Key Agreement), and defines the
key identifier to be 128 bits (96 bits "member identifier" + 32 bits
"key number").

Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Sabrina Dubroca authored and David S. Miller committed May 9, 2016
1 parent c81aa79 commit 8acca6a
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Showing 2 changed files with 16 additions and 7 deletions.
19 changes: 13 additions & 6 deletions drivers/net/macsec.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,7 @@ struct gcm_iv {
* @tfm: crypto struct, key storage
*/
struct macsec_key {
u64 id;
u8 id[MACSEC_KEYID_LEN];
struct crypto_aead *tfm;
};

Expand Down Expand Up @@ -1529,7 +1529,8 @@ static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
[MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
[MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
[MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
[MACSEC_SA_ATTR_KEYID] = { .type = NLA_U64 },
[MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
.len = MACSEC_KEYID_LEN, },
[MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
.len = MACSEC_MAX_KEY_LEN, },
};
Expand Down Expand Up @@ -1576,6 +1577,9 @@ static bool validate_add_rxsa(struct nlattr **attrs)
return false;
}

if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
return false;

return true;
}

Expand Down Expand Up @@ -1641,7 +1645,7 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);

rx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]);
nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEY], MACSEC_KEYID_LEN);
rx_sa->sc = rx_sc;
rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);

Expand Down Expand Up @@ -1722,6 +1726,9 @@ static bool validate_add_txsa(struct nlattr **attrs)
return false;
}

if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
return false;

return true;
}

Expand Down Expand Up @@ -1777,7 +1784,7 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
return -ENOMEM;
}

tx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]);
nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEY], MACSEC_KEYID_LEN);

spin_lock_bh(&tx_sa->lock);
tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
Expand Down Expand Up @@ -2318,7 +2325,7 @@ static int dump_secy(struct macsec_secy *secy, struct net_device *dev,

if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, tx_sa->key.id) ||
nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
nla_nest_cancel(skb, txsa_nest);
nla_nest_cancel(skb, txsa_list);
Expand Down Expand Up @@ -2419,7 +2426,7 @@ static int dump_secy(struct macsec_secy *secy, struct net_device *dev,

if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, rx_sa->key.id) ||
nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
nla_nest_cancel(skb, rxsa_nest);
nla_nest_cancel(skb, rxsc_nest);
Expand Down
4 changes: 3 additions & 1 deletion include/uapi/linux/if_macsec.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,8 @@

#define MACSEC_MAX_KEY_LEN 128

#define MACSEC_KEYID_LEN 16

#define MACSEC_DEFAULT_CIPHER_ID 0x0080020001000001ULL
#define MACSEC_DEFAULT_CIPHER_ALT 0x0080C20001000001ULL

Expand Down Expand Up @@ -77,7 +79,7 @@ enum macsec_sa_attrs {
MACSEC_SA_ATTR_ACTIVE, /* config/dump, u8 0..1 */
MACSEC_SA_ATTR_PN, /* config/dump, u32 */
MACSEC_SA_ATTR_KEY, /* config, data */
MACSEC_SA_ATTR_KEYID, /* config/dump, u64 */
MACSEC_SA_ATTR_KEYID, /* config/dump, 128-bit */
MACSEC_SA_ATTR_STATS, /* dump, nested, macsec_sa_stats_attr */
__MACSEC_SA_ATTR_END,
NUM_MACSEC_SA_ATTR = __MACSEC_SA_ATTR_END,
Expand Down

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