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net/macsec: Move some code for sharing with various drivers that implements offload

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Move some MACsec infrastructure like defines and functions,
in order to avoid code duplication for future drivers which
implements MACsec offload.

Signed-off-by: Lior Nahmanson <liorna@nvidia.com>
Reviewed-by: Raed Salem <raeds@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Reviewed-by: Ben Ben-Ishay <benishay@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lior Nahmanson 2022-09-05 22:21:15 -07:00 committed by David S. Miller
parent 860ead89b8
commit b1671253c6
2 changed files with 27 additions and 27 deletions
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33
drivers/net/macsec.c
View File

@ -25,8 +25,6 @@
#include <uapi/linux/if_macsec.h>
#define MACSEC_SCI_LEN 8
/* SecTAG length = macsec_eth_header without the optional SCI */
#define MACSEC_TAG_LEN 6
@ -47,20 +45,10 @@ struct macsec_eth_header {
u8 secure_channel_id[8]; /* optional */
} __packed;
#define MACSEC_TCI_VERSION 0x80
#define MACSEC_TCI_ES 0x40 /* end station */
#define MACSEC_TCI_SC 0x20 /* SCI present */
#define MACSEC_TCI_SCB 0x10 /* epon */
#define MACSEC_TCI_E 0x08 /* encryption */
#define MACSEC_TCI_C 0x04 /* changed text */
#define MACSEC_AN_MASK 0x03 /* association number */
#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
#define MIN_NON_SHORT_LEN 48
#define GCM_AES_IV_LEN 12
#define DEFAULT_ICV_LEN 16
#define for_each_rxsc(secy, sc) \
for (sc = rcu_dereference_bh(secy->rx_sc); \
@ -244,7 +232,6 @@ static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
return (struct macsec_cb *)skb->cb;
}
#define MACSEC_PORT_ES (htons(0x0001))
#define MACSEC_PORT_SCB (0x0000)
#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
@ -259,14 +246,6 @@ static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
#define DEFAULT_ENCODING_SA 0
#define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
static bool send_sci(const struct macsec_secy *secy)
{
const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
return tx_sc->send_sci ||
(secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
}
static sci_t make_sci(const u8 *addr, __be16 port)
{
sci_t sci;
@ -331,7 +310,7 @@ static void macsec_fill_sectag(struct macsec_eth_header *h,
/* with GCM, C/E clear for !encrypt, both set for encrypt */
if (tx_sc->encrypt)
h->tci_an |= MACSEC_TCI_CONFID;
else if (secy->icv_len != DEFAULT_ICV_LEN)
else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN)
h->tci_an |= MACSEC_TCI_C;
h->tci_an |= tx_sc->encoding_sa;
@ -655,7 +634,7 @@ static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
unprotected_len = skb->len;
eth = eth_hdr(skb);
sci_present = send_sci(secy);
sci_present = macsec_send_sci(secy);
hh = skb_push(skb, macsec_extra_len(sci_present));
memmove(hh, eth, 2 * ETH_ALEN);
@ -1303,7 +1282,7 @@ nosci:
/* 10.6.1 if the SC is not found */
cbit = !!(hdr->tci_an & MACSEC_TCI_C);
if (!cbit)
macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
macsec_extra_len(macsec_skb_cb(skb)->has_sci));
list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
@ -4067,7 +4046,7 @@ static int macsec_newlink(struct net *net, struct net_device *dev,
{
struct macsec_dev *macsec = macsec_priv(dev);
rx_handler_func_t *rx_handler;
u8 icv_len = DEFAULT_ICV_LEN;
u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
struct net_device *real_dev;
int err, mtu;
sci_t sci;
@ -4191,7 +4170,7 @@ static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
u64 csid = MACSEC_DEFAULT_CIPHER_ID;
u8 icv_len = DEFAULT_ICV_LEN;
u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
int flag;
bool es, scb, sci;
@ -4203,7 +4182,7 @@ static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
if (data[IFLA_MACSEC_ICV_LEN]) {
icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
if (icv_len != DEFAULT_ICV_LEN) {
if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
char dummy_key[DEFAULT_SAK_LEN] = { 0 };
struct crypto_aead *dummy_tfm;

21
include/net/macsec.h
View File

@ -16,6 +16,20 @@
#define MACSEC_NUM_AN 4 /* 2 bits for the association number */
#define MACSEC_SCI_LEN 8
#define MACSEC_PORT_ES (htons(0x0001))
#define MACSEC_TCI_VERSION 0x80
#define MACSEC_TCI_ES 0x40 /* end station */
#define MACSEC_TCI_SC 0x20 /* SCI present */
#define MACSEC_TCI_SCB 0x10 /* epon */
#define MACSEC_TCI_E 0x08 /* encryption */
#define MACSEC_TCI_C 0x04 /* changed text */
#define MACSEC_AN_MASK 0x03 /* association number */
#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
#define MACSEC_DEFAULT_ICV_LEN 16
typedef u64 __bitwise sci_t;
typedef u32 __bitwise ssci_t;
@ -292,5 +306,12 @@ struct macsec_ops {
};
void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa);
static inline bool macsec_send_sci(const struct macsec_secy *secy)
{
const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
return tx_sc->send_sci ||
(secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
}
#endif /* _NET_MACSEC_H_ */