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macsec: Netlink support of XPN cipher suites (IEEE 802.1AEbw)
Netlink support of extended packet number cipher suites,
allows adding and updating XPN macsec interfaces.
Added support in:
* Creating interfaces with GCM-AES-XPN-128 and GCM-AES-XPN-256 suites.
* Setting and getting 64bit packet numbers with of SAs.
* Setting (only on SA creation) and getting ssci of SAs.
* Setting salt when installing a SAK.
Added 2 cipher suite identifiers according to 802.1AE-2018 table 14-1:
* MACSEC_CIPHER_ID_GCM_AES_XPN_128
* MACSEC_CIPHER_ID_GCM_AES_XPN_256
In addition, added 2 new netlink attribute types:
* MACSEC_SA_ATTR_SSCI
* MACSEC_SA_ATTR_SALT
Depends on: macsec: Support XPN frame handling - IEEE 802.1AEbw.
Signed-off-by: Era Mayflower <mayflowerera@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Era Mayflower
David S. Miller
parent
a21ecf0e03
commit
48ef50fa86
@ -240,11 +240,13 @@ static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
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#define MACSEC_PORT_ES (htons(0x0001))
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#define MACSEC_PORT_SCB (0x0000)
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#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
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#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
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#define MACSEC_GCM_AES_128_SAK_LEN 16
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#define MACSEC_GCM_AES_256_SAK_LEN 32
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#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
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#define DEFAULT_XPN false
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#define DEFAULT_SEND_SCI true
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#define DEFAULT_ENCRYPT false
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#define DEFAULT_ENCODING_SA 0
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@ -1311,6 +1313,7 @@ static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
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return PTR_ERR(rx_sa->key.tfm);
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}
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rx_sa->ssci = MACSEC_UNDEF_SSCI;
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rx_sa->active = false;
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rx_sa->next_pn = 1;
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refcount_set(&rx_sa->refcnt, 1);
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@ -1409,6 +1412,7 @@ static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
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return PTR_ERR(tx_sa->key.tfm);
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}
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tx_sa->ssci = MACSEC_UNDEF_SSCI;
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tx_sa->active = false;
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refcount_set(&tx_sa->refcnt, 1);
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spin_lock_init(&tx_sa->lock);
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@ -1452,6 +1456,16 @@ static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
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return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
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}
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static ssci_t nla_get_ssci(const struct nlattr *nla)
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{
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return (__force ssci_t)nla_get_u32(nla);
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}
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static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
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{
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return nla_put_u32(skb, attrtype, (__force u64)value);
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}
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static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
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struct nlattr **attrs,
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struct nlattr **tb_sa,
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@ -1567,11 +1581,14 @@ static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
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static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
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[MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
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[MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
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[MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
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[MACSEC_SA_ATTR_PN] = { .type = NLA_MIN_LEN, .len = 4 },
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[MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
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.len = MACSEC_KEYID_LEN, },
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[MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
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.len = MACSEC_MAX_KEY_LEN, },
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[MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
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[MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
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.len = MACSEC_SALT_LEN, },
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};
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static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
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@ -1644,7 +1661,8 @@ static bool validate_add_rxsa(struct nlattr **attrs)
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if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
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return false;
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if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
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if (attrs[MACSEC_SA_ATTR_PN] &&
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*(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0)
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return false;
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if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
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@ -1666,6 +1684,7 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
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struct macsec_rx_sc *rx_sc;
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struct macsec_rx_sa *rx_sa;
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unsigned char assoc_num;
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int pn_len;
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struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
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struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
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int err;
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@ -1698,6 +1717,29 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
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return -EINVAL;
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}
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pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
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if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
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pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
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nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
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rtnl_unlock();
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return -EINVAL;
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}
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if (secy->xpn) {
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if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
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rtnl_unlock();
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return -EINVAL;
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}
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if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
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pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
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nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
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MACSEC_SA_ATTR_SALT);
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rtnl_unlock();
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return -EINVAL;
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}
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}
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rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
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if (rx_sa) {
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rtnl_unlock();
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@ -1720,7 +1762,7 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
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if (tb_sa[MACSEC_SA_ATTR_PN]) {
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spin_lock_bh(&rx_sa->lock);
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rx_sa->next_pn_halves.lower = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
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rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
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spin_unlock_bh(&rx_sa->lock);
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}
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@ -1750,6 +1792,12 @@ static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
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goto cleanup;
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}
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if (secy->xpn) {
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rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
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nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
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MACSEC_SALT_LEN);
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}
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nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
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rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
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@ -1874,6 +1922,7 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
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struct macsec_tx_sc *tx_sc;
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struct macsec_tx_sa *tx_sa;
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unsigned char assoc_num;
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int pn_len;
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struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
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bool was_operational;
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int err;
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@ -1906,6 +1955,29 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
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return -EINVAL;
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}
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pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
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if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
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pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
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nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
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rtnl_unlock();
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return -EINVAL;
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}
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if (secy->xpn) {
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if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
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rtnl_unlock();
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return -EINVAL;
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}
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if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
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pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
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nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
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MACSEC_SA_ATTR_SALT);
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rtnl_unlock();
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return -EINVAL;
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}
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}
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tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
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if (tx_sa) {
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rtnl_unlock();
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@ -1927,7 +1999,7 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
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}
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spin_lock_bh(&tx_sa->lock);
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tx_sa->next_pn_halves.lower = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
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tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
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spin_unlock_bh(&tx_sa->lock);
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if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
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@ -1958,6 +2030,12 @@ static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
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goto cleanup;
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}
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if (secy->xpn) {
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tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
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nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
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MACSEC_SALT_LEN);
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}
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nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
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rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
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@ -2164,7 +2242,9 @@ static bool validate_upd_sa(struct nlattr **attrs)
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{
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if (!attrs[MACSEC_SA_ATTR_AN] ||
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attrs[MACSEC_SA_ATTR_KEY] ||
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attrs[MACSEC_SA_ATTR_KEYID])
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attrs[MACSEC_SA_ATTR_KEYID] ||
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attrs[MACSEC_SA_ATTR_SSCI] ||
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attrs[MACSEC_SA_ATTR_SALT])
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return false;
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if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
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@ -2214,9 +2294,19 @@ static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
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}
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if (tb_sa[MACSEC_SA_ATTR_PN]) {
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int pn_len;
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pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
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if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
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pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
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nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
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rtnl_unlock();
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return -EINVAL;
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}
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spin_lock_bh(&tx_sa->lock);
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prev_pn = tx_sa->next_pn_halves;
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tx_sa->next_pn_halves.lower = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
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tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
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spin_unlock_bh(&tx_sa->lock);
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}
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@ -2300,9 +2390,19 @@ static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
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}
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if (tb_sa[MACSEC_SA_ATTR_PN]) {
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int pn_len;
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pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
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if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
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pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
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nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
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rtnl_unlock();
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return -EINVAL;
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}
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spin_lock_bh(&rx_sa->lock);
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prev_pn = rx_sa->next_pn_halves;
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rx_sa->next_pn_halves.lower = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
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rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
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spin_unlock_bh(&rx_sa->lock);
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}
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@ -2749,10 +2849,10 @@ static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
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switch (secy->key_len) {
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case MACSEC_GCM_AES_128_SAK_LEN:
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csid = MACSEC_DEFAULT_CIPHER_ID;
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csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
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break;
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case MACSEC_GCM_AES_256_SAK_LEN:
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csid = MACSEC_CIPHER_ID_GCM_AES_256;
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csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
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break;
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default:
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goto cancel;
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@ -2843,6 +2943,8 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
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for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
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struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
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struct nlattr *txsa_nest;
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u64 pn;
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int pn_len;
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if (!tx_sa)
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continue;
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@ -2853,9 +2955,18 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
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goto nla_put_failure;
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}
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if (secy->xpn) {
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pn = tx_sa->next_pn;
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pn_len = MACSEC_XPN_PN_LEN;
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} else {
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pn = tx_sa->next_pn_halves.lower;
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pn_len = MACSEC_DEFAULT_PN_LEN;
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}
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if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
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nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn_halves.lower) ||
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nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
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nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
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(secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
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nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
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nla_nest_cancel(skb, txsa_nest);
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nla_nest_cancel(skb, txsa_list);
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@ -2928,6 +3039,8 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
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for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
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struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
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struct nlattr *rxsa_nest;
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u64 pn;
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int pn_len;
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if (!rx_sa)
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continue;
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@ -2957,9 +3070,18 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
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}
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nla_nest_end(skb, attr);
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if (secy->xpn) {
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pn = rx_sa->next_pn;
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pn_len = MACSEC_XPN_PN_LEN;
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} else {
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pn = rx_sa->next_pn_halves.lower;
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pn_len = MACSEC_DEFAULT_PN_LEN;
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}
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if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
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nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn_halves.lower) ||
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nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
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nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
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(secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
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nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
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nla_nest_cancel(skb, rxsa_nest);
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nla_nest_cancel(skb, rxsc_nest);
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@ -3503,9 +3625,19 @@ static int macsec_changelink_common(struct net_device *dev,
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case MACSEC_CIPHER_ID_GCM_AES_128:
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case MACSEC_DEFAULT_CIPHER_ID:
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secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
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secy->xpn = false;
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break;
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case MACSEC_CIPHER_ID_GCM_AES_256:
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secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
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secy->xpn = false;
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break;
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case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
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secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
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secy->xpn = true;
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break;
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case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
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secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
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secy->xpn = true;
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break;
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default:
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return -EINVAL;
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@ -3695,6 +3827,7 @@ static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
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secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
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secy->protect_frames = true;
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secy->replay_protect = false;
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secy->xpn = DEFAULT_XPN;
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secy->sci = sci;
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secy->tx_sc.active = true;
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@ -3824,6 +3957,8 @@ static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
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switch (csid) {
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case MACSEC_CIPHER_ID_GCM_AES_128:
|
||||
case MACSEC_CIPHER_ID_GCM_AES_256:
|
||||
case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
|
||||
case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
|
||||
case MACSEC_DEFAULT_CIPHER_ID:
|
||||
if (icv_len < MACSEC_MIN_ICV_LEN ||
|
||||
icv_len > MACSEC_STD_ICV_LEN)
|
||||
@ -3897,10 +4032,10 @@ static int macsec_fill_info(struct sk_buff *skb,
|
||||
|
||||
switch (secy->key_len) {
|
||||
case MACSEC_GCM_AES_128_SAK_LEN:
|
||||
csid = MACSEC_DEFAULT_CIPHER_ID;
|
||||
csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
|
||||
break;
|
||||
case MACSEC_GCM_AES_256_SAK_LEN:
|
||||
csid = MACSEC_CIPHER_ID_GCM_AES_256;
|
||||
csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
|
||||
break;
|
||||
default:
|
||||
goto nla_put_failure;
|
||||
|
||||
@ -11,6 +11,9 @@
|
||||
#include <uapi/linux/if_link.h>
|
||||
#include <uapi/linux/if_macsec.h>
|
||||
|
||||
#define MACSEC_DEFAULT_PN_LEN 4
|
||||
#define MACSEC_XPN_PN_LEN 8
|
||||
|
||||
#define MACSEC_SALT_LEN 12
|
||||
#define MACSEC_NUM_AN 4 /* 2 bits for the association number */
|
||||
|
||||
|
||||
@ -22,9 +22,11 @@
|
||||
|
||||
#define MACSEC_KEYID_LEN 16
|
||||
|
||||
/* cipher IDs as per IEEE802.1AEbn-2011 */
|
||||
/* cipher IDs as per IEEE802.1AE-2018 (Table 14-1) */
|
||||
#define MACSEC_CIPHER_ID_GCM_AES_128 0x0080C20001000001ULL
|
||||
#define MACSEC_CIPHER_ID_GCM_AES_256 0x0080C20001000002ULL
|
||||
#define MACSEC_CIPHER_ID_GCM_AES_XPN_128 0x0080C20001000003ULL
|
||||
#define MACSEC_CIPHER_ID_GCM_AES_XPN_256 0x0080C20001000004ULL
|
||||
|
||||
/* deprecated cipher ID for GCM-AES-128 */
|
||||
#define MACSEC_DEFAULT_CIPHER_ID 0x0080020001000001ULL
|
||||
@ -88,11 +90,13 @@ enum macsec_sa_attrs {
|
||||
MACSEC_SA_ATTR_UNSPEC,
|
||||
MACSEC_SA_ATTR_AN, /* config/dump, u8 0..3 */
|
||||
MACSEC_SA_ATTR_ACTIVE, /* config/dump, u8 0..1 */
|
||||
MACSEC_SA_ATTR_PN, /* config/dump, u32 */
|
||||
MACSEC_SA_ATTR_PN, /* config/dump, u32/u64 (u64 if XPN) */
|
||||
MACSEC_SA_ATTR_KEY, /* config, data */
|
||||
MACSEC_SA_ATTR_KEYID, /* config/dump, 128-bit */
|
||||
MACSEC_SA_ATTR_STATS, /* dump, nested, macsec_sa_stats_attr */
|
||||
MACSEC_SA_ATTR_PAD,
|
||||
MACSEC_SA_ATTR_SSCI, /* config/dump, u32 - XPN only */
|
||||
MACSEC_SA_ATTR_SALT, /* config, 96-bit - XPN only */
|
||||
__MACSEC_SA_ATTR_END,
|
||||
NUM_MACSEC_SA_ATTR = __MACSEC_SA_ATTR_END,
|
||||
MACSEC_SA_ATTR_MAX = __MACSEC_SA_ATTR_END - 1,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user