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macsec_linux: Add support for MACsec hardware offload

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This uses libnl3 to communicate with the macsec module available on
Linux. A recent enough version of libnl is needed for the hardware
offload support.

Signed-off-by: Emeel Hakim <ehakim@nvidia.com>
This commit is contained in:
Emeel Hakim 2023-02-14 10:26:57 +02:00 committed by Jouni Malinen
parent 6d24673ab8
commit 40c1396644
1 changed files with 49 additions and 0 deletions
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49
src/drivers/driver_macsec_linux.c
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@ -32,6 +32,10 @@
#define UNUSED_SCI 0xffffffffffffffff
#if LIBNL_VER_NUM >= LIBNL_VER(3, 6)
#define LIBNL_HAS_OFFLOAD
#endif
struct cb_arg {
struct macsec_drv_data *drv;
u32 *pn;
@ -73,6 +77,11 @@ struct macsec_drv_data {
bool replay_protect;
bool replay_protect_set;
#ifdef LIBNL_HAS_OFFLOAD
enum macsec_offload offload;
bool offload_set;
#endif /* LIBNL_HAS_OFFLOAD */
u32 replay_window;
u8 encoding_sa;
@ -228,6 +237,15 @@ static int try_commit(struct macsec_drv_data *drv)
drv->replay_window);
}
#ifdef LIBNL_HAS_OFFLOAD
if (drv->offload_set) {
wpa_printf(MSG_DEBUG, DRV_PREFIX
"%s: try_commit offload=%d",
drv->ifname, drv->offload);
rtnl_link_macsec_set_offload(drv->link, drv->offload);
}
#endif /* LIBNL_HAS_OFFLOAD */
if (drv->encoding_sa_set) {
wpa_printf(MSG_DEBUG, DRV_PREFIX
"%s: try_commit encoding_sa=%d",
@ -455,6 +473,36 @@ static int macsec_drv_set_replay_protect(void *priv, bool enabled,
}
/**
* macsec_drv_set_offload - Set offload status
* @priv: Private driver interface data
* @offload: 0 = MACSEC_OFFLOAD_OFF
* 1 = MACSEC_OFFLOAD_PHY
* 2 = MACSEC_OFFLOAD_MAC
* Returns: 0 on success, -1 on failure (or if not supported)
*/
static int macsec_drv_set_offload(void *priv, u8 offload)
{
#ifdef LIBNL_HAS_OFFLOAD
struct macsec_drv_data *drv = priv;
wpa_printf(MSG_DEBUG, "%s -> %02" PRIx8, __func__, offload);
drv->offload_set = true;
drv->offload = offload;
return try_commit(drv);
#else /* LIBNL_HAS_OFFLOAD */
if (offload == 0)
return 0;
wpa_printf(MSG_INFO,
"%s: libnl version does not include support for MACsec offload",
__func__);
return -1;
#endif /* LIBNL_HAS_OFFLOAD */
}
/**
* macsec_drv_set_current_cipher_suite - Set current cipher suite
* @priv: Private driver interface data
@ -1648,6 +1696,7 @@ const struct wpa_driver_ops wpa_driver_macsec_linux_ops = {
.enable_protect_frames = macsec_drv_enable_protect_frames,
.enable_encrypt = macsec_drv_enable_encrypt,
.set_replay_protect = macsec_drv_set_replay_protect,
.set_offload = macsec_drv_set_offload,
.set_current_cipher_suite = macsec_drv_set_current_cipher_suite,
.enable_controlled_port = macsec_drv_enable_controlled_port,
.get_receive_lowest_pn = macsec_drv_get_receive_lowest_pn,