macsec: Support XPN frame handling - IEEE 802.1AEbw
Support extended packet number cipher suites (802.1AEbw) frames handling.
This does not include the needed netlink patches.
* Added xpn boolean field to `struct macsec_secy`.
* Added ssci field to `struct_macsec_tx_sa` (802.1AE figure 10-5).
* Added ssci field to `struct_macsec_rx_sa` (802.1AE figure 10-5).
* Added salt field to `struct macsec_key` (802.1AE 10.7 NOTE 1).
* Created pn_t type for easy access to lower and upper halves.
* Created salt_t type for easy access to the "ssci" and "pn" parts.
* Created `macsec_fill_iv_xpn` function to create IV in XPN mode.
* Support in PN recovery and preliminary replay check in XPN mode.
In addition, according to IEEE 802.1AEbw figure 10-5, the PN of incoming
frame can be 0 when XPN cipher suite is used, so fixed the function
`macsec_validate_skb` to fail on PN=0 only if XPN is off.
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
65b7a2c8e3
commit
a21ecf0e03
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@ -19,6 +19,7 @@
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#include <net/gro_cells.h>
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#include <net/macsec.h>
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#include <linux/phy.h>
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#include <linux/byteorder/generic.h>
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#include <uapi/linux/if_macsec.h>
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@ -68,6 +69,16 @@ struct macsec_eth_header {
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sc; \
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sc = rtnl_dereference(sc->next))
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#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
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struct gcm_iv_xpn {
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union {
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u8 short_secure_channel_id[4];
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ssci_t ssci;
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};
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__be64 pn;
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} __packed;
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struct gcm_iv {
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union {
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u8 secure_channel_id[8];
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@ -372,8 +383,8 @@ static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
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return __macsec_get_ops(macsec->offload, macsec, ctx);
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}
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/* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
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static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
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/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
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static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
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{
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struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
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int len = skb->len - 2 * ETH_ALEN;
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@ -398,8 +409,8 @@ static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
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if (h->unused)
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return false;
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/* rx.pn != 0 (figure 10-5) */
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if (!h->packet_number)
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/* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
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if (!h->packet_number && !xpn)
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return false;
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/* length check, f) g) h) i) */
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@ -411,6 +422,15 @@ static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
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#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
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#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
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static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
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salt_t salt)
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{
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struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
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gcm_iv->ssci = ssci ^ salt.ssci;
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gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
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}
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static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
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{
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struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
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@ -446,14 +466,19 @@ void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
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}
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EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
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static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
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static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
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struct macsec_secy *secy)
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{
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u32 pn;
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pn_t pn;
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spin_lock_bh(&tx_sa->lock);
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pn = tx_sa->next_pn;
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tx_sa->next_pn++;
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pn = tx_sa->next_pn_halves;
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if (secy->xpn)
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tx_sa->next_pn++;
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else
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tx_sa->next_pn_halves.lower++;
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if (tx_sa->next_pn == 0)
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__macsec_pn_wrapped(secy, tx_sa);
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spin_unlock_bh(&tx_sa->lock);
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@ -568,7 +593,7 @@ static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
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struct macsec_tx_sa *tx_sa;
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struct macsec_dev *macsec = macsec_priv(dev);
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bool sci_present;
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u32 pn;
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pn_t pn;
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secy = &macsec->secy;
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tx_sc = &secy->tx_sc;
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@ -610,12 +635,12 @@ static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
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memmove(hh, eth, 2 * ETH_ALEN);
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pn = tx_sa_update_pn(tx_sa, secy);
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if (pn == 0) {
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if (pn.full64 == 0) {
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macsec_txsa_put(tx_sa);
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kfree_skb(skb);
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return ERR_PTR(-ENOLINK);
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}
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macsec_fill_sectag(hh, secy, pn, sci_present);
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macsec_fill_sectag(hh, secy, pn.lower, sci_present);
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macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
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skb_put(skb, secy->icv_len);
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@ -646,7 +671,10 @@ static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
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return ERR_PTR(-ENOMEM);
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}
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macsec_fill_iv(iv, secy->sci, pn);
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if (secy->xpn)
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macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
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else
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macsec_fill_iv(iv, secy->sci, pn.lower);
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sg_init_table(sg, ret);
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ret = skb_to_sgvec(skb, sg, 0, skb->len);
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@ -698,13 +726,14 @@ static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u
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u32 lowest_pn = 0;
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spin_lock(&rx_sa->lock);
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if (rx_sa->next_pn >= secy->replay_window)
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lowest_pn = rx_sa->next_pn - secy->replay_window;
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if (rx_sa->next_pn_halves.lower >= secy->replay_window)
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lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
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/* Now perform replay protection check again
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* (see IEEE 802.1AE-2006 figure 10-5)
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*/
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if (secy->replay_protect && pn < lowest_pn) {
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if (secy->replay_protect && pn < lowest_pn &&
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(!secy->xpn || pn_same_half(pn, lowest_pn))) {
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spin_unlock(&rx_sa->lock);
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u64_stats_update_begin(&rxsc_stats->syncp);
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rxsc_stats->stats.InPktsLate++;
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@ -753,8 +782,15 @@ static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u
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}
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u64_stats_update_end(&rxsc_stats->syncp);
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if (pn >= rx_sa->next_pn)
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rx_sa->next_pn = pn + 1;
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// Instead of "pn >=" - to support pn overflow in xpn
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if (pn + 1 > rx_sa->next_pn_halves.lower) {
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rx_sa->next_pn_halves.lower = pn + 1;
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} else if (secy->xpn &&
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!pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
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rx_sa->next_pn_halves.upper++;
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rx_sa->next_pn_halves.lower = pn + 1;
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}
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spin_unlock(&rx_sa->lock);
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}
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@ -841,6 +877,7 @@ static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
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unsigned char *iv;
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struct aead_request *req;
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struct macsec_eth_header *hdr;
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u32 hdr_pn;
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u16 icv_len = secy->icv_len;
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macsec_skb_cb(skb)->valid = false;
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@ -860,7 +897,21 @@ static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
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}
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hdr = (struct macsec_eth_header *)skb->data;
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macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
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hdr_pn = ntohl(hdr->packet_number);
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if (secy->xpn) {
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pn_t recovered_pn = rx_sa->next_pn_halves;
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recovered_pn.lower = hdr_pn;
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if (hdr_pn < rx_sa->next_pn_halves.lower &&
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!pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
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recovered_pn.upper++;
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macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
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rx_sa->key.salt);
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} else {
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macsec_fill_iv(iv, sci, hdr_pn);
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}
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sg_init_table(sg, ret);
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ret = skb_to_sgvec(skb, sg, 0, skb->len);
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@ -1001,7 +1052,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
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struct macsec_rxh_data *rxd;
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struct macsec_dev *macsec;
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sci_t sci;
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u32 pn;
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u32 hdr_pn;
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bool cbit;
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struct pcpu_rx_sc_stats *rxsc_stats;
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struct pcpu_secy_stats *secy_stats;
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@ -1072,7 +1123,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
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secy_stats = this_cpu_ptr(macsec->stats);
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rxsc_stats = this_cpu_ptr(rx_sc->stats);
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if (!macsec_validate_skb(skb, secy->icv_len)) {
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if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
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u64_stats_update_begin(&secy_stats->syncp);
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secy_stats->stats.InPktsBadTag++;
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u64_stats_update_end(&secy_stats->syncp);
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@ -1104,13 +1155,16 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
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}
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/* First, PN check to avoid decrypting obviously wrong packets */
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pn = ntohl(hdr->packet_number);
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hdr_pn = ntohl(hdr->packet_number);
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if (secy->replay_protect) {
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bool late;
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spin_lock(&rx_sa->lock);
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late = rx_sa->next_pn >= secy->replay_window &&
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pn < (rx_sa->next_pn - secy->replay_window);
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late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
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hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
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if (secy->xpn)
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late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
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spin_unlock(&rx_sa->lock);
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if (late) {
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@ -1139,7 +1193,7 @@ static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
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return RX_HANDLER_CONSUMED;
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}
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if (!macsec_post_decrypt(skb, secy, pn))
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if (!macsec_post_decrypt(skb, secy, hdr_pn))
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goto drop;
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deliver:
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@ -1666,7 +1720,7 @@ 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 = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
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rx_sa->next_pn_halves.lower = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
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spin_unlock_bh(&rx_sa->lock);
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}
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@ -1873,7 +1927,7 @@ 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 = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
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tx_sa->next_pn_halves.lower = nla_get_u32(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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@ -2137,9 +2191,11 @@ static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
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u8 assoc_num;
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struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
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bool was_operational, was_active;
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u32 prev_pn = 0;
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pn_t prev_pn;
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int ret = 0;
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prev_pn.full64 = 0;
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if (!attrs[MACSEC_ATTR_IFINDEX])
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return -EINVAL;
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@ -2159,8 +2215,8 @@ static int macsec_upd_txsa(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(&tx_sa->lock);
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prev_pn = tx_sa->next_pn;
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tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
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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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spin_unlock_bh(&tx_sa->lock);
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}
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@ -2198,7 +2254,7 @@ static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
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cleanup:
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if (tb_sa[MACSEC_SA_ATTR_PN]) {
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spin_lock_bh(&tx_sa->lock);
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tx_sa->next_pn = prev_pn;
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tx_sa->next_pn_halves = prev_pn;
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spin_unlock_bh(&tx_sa->lock);
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}
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tx_sa->active = was_active;
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@ -2218,9 +2274,11 @@ static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
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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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bool was_active;
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u32 prev_pn = 0;
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pn_t prev_pn;
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int ret = 0;
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prev_pn.full64 = 0;
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if (!attrs[MACSEC_ATTR_IFINDEX])
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return -EINVAL;
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@ -2243,8 +2301,8 @@ static int macsec_upd_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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prev_pn = rx_sa->next_pn;
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rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
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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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spin_unlock_bh(&rx_sa->lock);
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}
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@ -2277,7 +2335,7 @@ static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
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cleanup:
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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 = prev_pn;
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rx_sa->next_pn_halves = prev_pn;
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spin_unlock_bh(&rx_sa->lock);
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}
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rx_sa->active = was_active;
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@ -2796,7 +2854,7 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
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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) ||
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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_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
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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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@ -2900,7 +2958,7 @@ dump_secy(struct macsec_secy *secy, struct net_device *dev,
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nla_nest_end(skb, attr);
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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) ||
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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_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
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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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@ -11,18 +11,45 @@
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#include <uapi/linux/if_link.h>
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#include <uapi/linux/if_macsec.h>
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typedef u64 __bitwise sci_t;
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#define MACSEC_SALT_LEN 12
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#define MACSEC_NUM_AN 4 /* 2 bits for the association number */
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typedef u64 __bitwise sci_t;
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typedef u32 __bitwise ssci_t;
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typedef union salt {
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struct {
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u32 ssci;
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u64 pn;
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} __packed;
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u8 bytes[MACSEC_SALT_LEN];
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} __packed salt_t;
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typedef union pn {
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struct {
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#if defined(__LITTLE_ENDIAN_BITFIELD)
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u32 lower;
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u32 upper;
|
||||
#elif defined(__BIG_ENDIAN_BITFIELD)
|
||||
u32 upper;
|
||||
u32 lower;
|
||||
#else
|
||||
#error "Please fix <asm/byteorder.h>"
|
||||
#endif
|
||||
};
|
||||
u64 full64;
|
||||
} pn_t;
|
||||
|
||||
/**
|
||||
* struct macsec_key - SA key
|
||||
* @id: user-provided key identifier
|
||||
* @tfm: crypto struct, key storage
|
||||
* @salt: salt used to generate IV in XPN cipher suites
|
||||
*/
|
||||
struct macsec_key {
|
||||
u8 id[MACSEC_KEYID_LEN];
|
||||
struct crypto_aead *tfm;
|
||||
salt_t salt;
|
||||
};
|
||||
|
||||
struct macsec_rx_sc_stats {
|
||||
|
|
@ -64,12 +91,17 @@ struct macsec_tx_sc_stats {
|
|||
* @next_pn: packet number expected for the next packet
|
||||
* @lock: protects next_pn manipulations
|
||||
* @key: key structure
|
||||
* @ssci: short secure channel identifier
|
||||
* @stats: per-SA stats
|
||||
*/
|
||||
struct macsec_rx_sa {
|
||||
struct macsec_key key;
|
||||
ssci_t ssci;
|
||||
spinlock_t lock;
|
||||
u32 next_pn;
|
||||
union {
|
||||
pn_t next_pn_halves;
|
||||
u64 next_pn;
|
||||
};
|
||||
refcount_t refcnt;
|
||||
bool active;
|
||||
struct macsec_rx_sa_stats __percpu *stats;
|
||||
|
|
@ -110,12 +142,17 @@ struct macsec_rx_sc {
|
|||
* @next_pn: packet number to use for the next packet
|
||||
* @lock: protects next_pn manipulations
|
||||
* @key: key structure
|
||||
* @ssci: short secure channel identifier
|
||||
* @stats: per-SA stats
|
||||
*/
|
||||
struct macsec_tx_sa {
|
||||
struct macsec_key key;
|
||||
ssci_t ssci;
|
||||
spinlock_t lock;
|
||||
u32 next_pn;
|
||||
union {
|
||||
pn_t next_pn_halves;
|
||||
u64 next_pn;
|
||||
};
|
||||
refcount_t refcnt;
|
||||
bool active;
|
||||
struct macsec_tx_sa_stats __percpu *stats;
|
||||
|
|
@ -152,6 +189,7 @@ struct macsec_tx_sc {
|
|||
* @key_len: length of keys used by the cipher suite
|
||||
* @icv_len: length of ICV used by the cipher suite
|
||||
* @validate_frames: validation mode
|
||||
* @xpn: enable XPN for this SecY
|
||||
* @operational: MAC_Operational flag
|
||||
* @protect_frames: enable protection for this SecY
|
||||
* @replay_protect: enable packet number checks on receive
|
||||
|
|
@ -166,6 +204,7 @@ struct macsec_secy {
|
|||
u16 key_len;
|
||||
u16 icv_len;
|
||||
enum macsec_validation_type validate_frames;
|
||||
bool xpn;
|
||||
bool operational;
|
||||
bool protect_frames;
|
||||
bool replay_protect;
|
||||
|
|
|
|||
Loading…
Reference in New Issue