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linux/drivers/net/macsec.c
Eric Dumazet 1eb2cded45 net: annotate writes on dev->mtu from ndo_change_mtu() 
Simon reported that ndo_change_mtu() methods were never
updated to use WRITE_ONCE(dev->mtu, new_mtu) as hinted
in commit 501a90c945 ("inet: protect against too small
mtu values.")

We read dev->mtu without holding RTNL in many places,
with READ_ONCE() annotations.

It is time to take care of ndo_change_mtu() methods
to use corresponding WRITE_ONCE()

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Simon Horman <horms@kernel.org>
Closes: https://lore.kernel.org/netdev/20240505144608.GB67882@kernel.org/
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Sabrina Dubroca <sd@queasysnail.net>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Shannon Nelson <shannon.nelson@amd.com>
Link: https://lore.kernel.org/r/20240506102812.3025432-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2024-05-07 16:19:14 -07:00

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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* drivers/net/macsec.c - MACsec device
*
* Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
*/
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/module.h>
#include <crypto/aead.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/refcount.h>
#include <net/genetlink.h>
#include <net/sock.h>
#include <net/gro_cells.h>
#include <net/macsec.h>
#include <net/dst_metadata.h>
#include <linux/phy.h>
#include <linux/byteorder/generic.h>
#include <linux/if_arp.h>
#include <uapi/linux/if_macsec.h>
/* SecTAG length = macsec_eth_header without the optional SCI */
#define MACSEC_TAG_LEN 6
struct macsec_eth_header {
struct ethhdr eth;
/* SecTAG */
u8 tci_an;
#if defined(__LITTLE_ENDIAN_BITFIELD)
u8 short_length:6,
unused:2;
#elif defined(__BIG_ENDIAN_BITFIELD)
u8 unused:2,
short_length:6;
#else
#error "Please fix <asm/byteorder.h>"
#endif
__be32 packet_number;
u8 secure_channel_id[8]; /* optional */
} __packed;
/* 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 for_each_rxsc(secy, sc) \
for (sc = rcu_dereference_bh(secy->rx_sc); \
sc; \
sc = rcu_dereference_bh(sc->next))
#define for_each_rxsc_rtnl(secy, sc) \
for (sc = rtnl_dereference(secy->rx_sc); \
sc; \
sc = rtnl_dereference(sc->next))
#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
struct gcm_iv_xpn {
union {
u8 short_secure_channel_id[4];
ssci_t ssci;
};
__be64 pn;
} __packed;
struct gcm_iv {
union {
u8 secure_channel_id[8];
sci_t sci;
};
__be32 pn;
};
#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
struct pcpu_secy_stats {
struct macsec_dev_stats stats;
struct u64_stats_sync syncp;
};
/**
* struct macsec_dev - private data
* @secy: SecY config
* @real_dev: pointer to underlying netdevice
* @dev_tracker: refcount tracker for @real_dev reference
* @stats: MACsec device stats
* @secys: linked list of SecY's on the underlying device
* @gro_cells: pointer to the Generic Receive Offload cell
* @offload: status of offloading on the MACsec device
* @insert_tx_tag: when offloading, device requires to insert an
* additional tag
*/
struct macsec_dev {
struct macsec_secy secy;
struct net_device *real_dev;
netdevice_tracker dev_tracker;
struct pcpu_secy_stats __percpu *stats;
struct list_head secys;
struct gro_cells gro_cells;
enum macsec_offload offload;
bool insert_tx_tag;
};
/**
* struct macsec_rxh_data - rx_handler private argument
* @secys: linked list of SecY's on this underlying device
*/
struct macsec_rxh_data {
struct list_head secys;
};
static struct macsec_dev *macsec_priv(const struct net_device *dev)
{
return (struct macsec_dev *)netdev_priv(dev);
}
static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
{
return rcu_dereference_bh(dev->rx_handler_data);
}
static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
{
return rtnl_dereference(dev->rx_handler_data);
}
struct macsec_cb {
struct aead_request *req;
union {
struct macsec_tx_sa *tx_sa;
struct macsec_rx_sa *rx_sa;
};
u8 assoc_num;
bool valid;
bool has_sci;
};
static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
{
struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
if (!sa || !sa->active)
return NULL;
if (!refcount_inc_not_zero(&sa->refcnt))
return NULL;
return sa;
}
static struct macsec_rx_sa *macsec_active_rxsa_get(struct macsec_rx_sc *rx_sc)
{
struct macsec_rx_sa *sa = NULL;
int an;
for (an = 0; an < MACSEC_NUM_AN; an++) {
sa = macsec_rxsa_get(rx_sc->sa[an]);
if (sa)
break;
}
return sa;
}
static void free_rx_sc_rcu(struct rcu_head *head)
{
struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
free_percpu(rx_sc->stats);
kfree(rx_sc);
}
static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
{
return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
}
static void macsec_rxsc_put(struct macsec_rx_sc *sc)
{
if (refcount_dec_and_test(&sc->refcnt))
call_rcu(&sc->rcu_head, free_rx_sc_rcu);
}
static void free_rxsa(struct rcu_head *head)
{
struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
crypto_free_aead(sa->key.tfm);
free_percpu(sa->stats);
kfree(sa);
}
static void macsec_rxsa_put(struct macsec_rx_sa *sa)
{
if (refcount_dec_and_test(&sa->refcnt))
call_rcu(&sa->rcu, free_rxsa);
}
static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
{
struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
if (!sa || !sa->active)
return NULL;
if (!refcount_inc_not_zero(&sa->refcnt))
return NULL;
return sa;
}
static void free_txsa(struct rcu_head *head)
{
struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
crypto_free_aead(sa->key.tfm);
free_percpu(sa->stats);
kfree(sa);
}
static void macsec_txsa_put(struct macsec_tx_sa *sa)
{
if (refcount_dec_and_test(&sa->refcnt))
call_rcu(&sa->rcu, free_txsa);
}
static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
{
BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
return (struct macsec_cb *)skb->cb;
}
#define MACSEC_PORT_SCB (0x0000)
#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
#define MACSEC_GCM_AES_128_SAK_LEN 16
#define MACSEC_GCM_AES_256_SAK_LEN 32
#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
#define DEFAULT_XPN false
#define DEFAULT_SEND_SCI true
#define DEFAULT_ENCRYPT false
#define DEFAULT_ENCODING_SA 0
#define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
static sci_t make_sci(const u8 *addr, __be16 port)
{
sci_t sci;
memcpy(&sci, addr, ETH_ALEN);
memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
return sci;
}
static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
{
sci_t sci;
if (sci_present)
memcpy(&sci, hdr->secure_channel_id,
sizeof(hdr->secure_channel_id));
else
sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
return sci;
}
static unsigned int macsec_sectag_len(bool sci_present)
{
return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
}
static unsigned int macsec_hdr_len(bool sci_present)
{
return macsec_sectag_len(sci_present) + ETH_HLEN;
}
static unsigned int macsec_extra_len(bool sci_present)
{
return macsec_sectag_len(sci_present) + sizeof(__be16);
}
/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
static void macsec_fill_sectag(struct macsec_eth_header *h,
const struct macsec_secy *secy, u32 pn,
bool sci_present)
{
const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
h->eth.h_proto = htons(ETH_P_MACSEC);
if (sci_present) {
h->tci_an |= MACSEC_TCI_SC;
memcpy(&h->secure_channel_id, &secy->sci,
sizeof(h->secure_channel_id));
} else {
if (tx_sc->end_station)
h->tci_an |= MACSEC_TCI_ES;
if (tx_sc->scb)
h->tci_an |= MACSEC_TCI_SCB;
}
h->packet_number = htonl(pn);
/* 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 != MACSEC_DEFAULT_ICV_LEN)
h->tci_an |= MACSEC_TCI_C;
h->tci_an |= tx_sc->encoding_sa;
}
static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
{
if (data_len < MIN_NON_SHORT_LEN)
h->short_length = data_len;
}
/* Checks if a MACsec interface is being offloaded to an hardware engine */
static bool macsec_is_offloaded(struct macsec_dev *macsec)
{
if (macsec->offload == MACSEC_OFFLOAD_MAC ||
macsec->offload == MACSEC_OFFLOAD_PHY)
return true;
return false;
}
/* Checks if underlying layers implement MACsec offloading functions. */
static bool macsec_check_offload(enum macsec_offload offload,
struct macsec_dev *macsec)
{
if (!macsec || !macsec->real_dev)
return false;
if (offload == MACSEC_OFFLOAD_PHY)
return macsec->real_dev->phydev &&
macsec->real_dev->phydev->macsec_ops;
else if (offload == MACSEC_OFFLOAD_MAC)
return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
macsec->real_dev->macsec_ops;
return false;
}
static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
struct macsec_dev *macsec,
struct macsec_context *ctx)
{
if (ctx) {
memset(ctx, 0, sizeof(*ctx));
ctx->offload = offload;
if (offload == MACSEC_OFFLOAD_PHY)
ctx->phydev = macsec->real_dev->phydev;
else if (offload == MACSEC_OFFLOAD_MAC)
ctx->netdev = macsec->real_dev;
}
if (offload == MACSEC_OFFLOAD_PHY)
return macsec->real_dev->phydev->macsec_ops;
else
return macsec->real_dev->macsec_ops;
}
/* Returns a pointer to the MACsec ops struct if any and updates the MACsec
* context device reference if provided.
*/
static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
struct macsec_context *ctx)
{
if (!macsec_check_offload(macsec->offload, macsec))
return NULL;
return __macsec_get_ops(macsec->offload, macsec, ctx);
}
/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
{
struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
int len = skb->len - 2 * ETH_ALEN;
int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
/* a) It comprises at least 17 octets */
if (skb->len <= 16)
return false;
/* b) MACsec EtherType: already checked */
/* c) V bit is clear */
if (h->tci_an & MACSEC_TCI_VERSION)
return false;
/* d) ES or SCB => !SC */
if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
(h->tci_an & MACSEC_TCI_SC))
return false;
/* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
if (h->unused)
return false;
/* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
if (!h->packet_number && !xpn)
return false;
/* length check, f) g) h) i) */
if (h->short_length)
return len == extra_len + h->short_length;
return len >= extra_len + MIN_NON_SHORT_LEN;
}
#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
salt_t salt)
{
struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
gcm_iv->ssci = ssci ^ salt.ssci;
gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
}
static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
{
struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
gcm_iv->sci = sci;
gcm_iv->pn = htonl(pn);
}
static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
{
return (struct macsec_eth_header *)skb_mac_header(skb);
}
static void __macsec_pn_wrapped(struct macsec_secy *secy,
struct macsec_tx_sa *tx_sa)
{
pr_debug("PN wrapped, transitioning to !oper\n");
tx_sa->active = false;
if (secy->protect_frames)
secy->operational = false;
}
void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
{
spin_lock_bh(&tx_sa->lock);
__macsec_pn_wrapped(secy, tx_sa);
spin_unlock_bh(&tx_sa->lock);
}
EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
struct macsec_secy *secy)
{
pn_t pn;
spin_lock_bh(&tx_sa->lock);
pn = tx_sa->next_pn_halves;
if (secy->xpn)
tx_sa->next_pn++;
else
tx_sa->next_pn_halves.lower++;
if (tx_sa->next_pn == 0)
__macsec_pn_wrapped(secy, tx_sa);
spin_unlock_bh(&tx_sa->lock);
return pn;
}
static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
{
struct macsec_dev *macsec = netdev_priv(dev);
skb->dev = macsec->real_dev;
skb_reset_mac_header(skb);
skb->protocol = eth_hdr(skb)->h_proto;
}
static unsigned int macsec_msdu_len(struct sk_buff *skb)
{
struct macsec_dev *macsec = macsec_priv(skb->dev);
struct macsec_secy *secy = &macsec->secy;
bool sci_present = macsec_skb_cb(skb)->has_sci;
return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;
}
static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
struct macsec_tx_sa *tx_sa)
{
unsigned int msdu_len = macsec_msdu_len(skb);
struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
u64_stats_update_begin(&txsc_stats->syncp);
if (tx_sc->encrypt) {
txsc_stats->stats.OutOctetsEncrypted += msdu_len;
txsc_stats->stats.OutPktsEncrypted++;
this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
} else {
txsc_stats->stats.OutOctetsProtected += msdu_len;
txsc_stats->stats.OutPktsProtected++;
this_cpu_inc(tx_sa->stats->OutPktsProtected);
}
u64_stats_update_end(&txsc_stats->syncp);
}
static void count_tx(struct net_device *dev, int ret, int len)
{
if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN))
dev_sw_netstats_tx_add(dev, 1, len);
}
static void macsec_encrypt_done(void *data, int err)
{
struct sk_buff *skb = data;
struct net_device *dev = skb->dev;
struct macsec_dev *macsec = macsec_priv(dev);
struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
int len, ret;
aead_request_free(macsec_skb_cb(skb)->req);
rcu_read_lock_bh();
macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
/* packet is encrypted/protected so tx_bytes must be calculated */
len = macsec_msdu_len(skb) + 2 * ETH_ALEN;
macsec_encrypt_finish(skb, dev);
ret = dev_queue_xmit(skb);
count_tx(dev, ret, len);
rcu_read_unlock_bh();
macsec_txsa_put(sa);
dev_put(dev);
}
static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
unsigned char **iv,
struct scatterlist **sg,
int num_frags)
{
size_t size, iv_offset, sg_offset;
struct aead_request *req;
void *tmp;
size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
iv_offset = size;
size += GCM_AES_IV_LEN;
size = ALIGN(size, __alignof__(struct scatterlist));
sg_offset = size;
size += sizeof(struct scatterlist) * num_frags;
tmp = kmalloc(size, GFP_ATOMIC);
if (!tmp)
return NULL;
*iv = (unsigned char *)(tmp + iv_offset);
*sg = (struct scatterlist *)(tmp + sg_offset);
req = tmp;
aead_request_set_tfm(req, tfm);
return req;
}
static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
struct net_device *dev)
{
int ret;
struct scatterlist *sg;
struct sk_buff *trailer;
unsigned char *iv;
struct ethhdr *eth;
struct macsec_eth_header *hh;
size_t unprotected_len;
struct aead_request *req;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
struct macsec_dev *macsec = macsec_priv(dev);
bool sci_present;
pn_t pn;
secy = &macsec->secy;
tx_sc = &secy->tx_sc;
/* 10.5.1 TX SA assignment */
tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
if (!tx_sa) {
secy->operational = false;
kfree_skb(skb);
return ERR_PTR(-EINVAL);
}
if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
struct sk_buff *nskb = skb_copy_expand(skb,
MACSEC_NEEDED_HEADROOM,
MACSEC_NEEDED_TAILROOM,
GFP_ATOMIC);
if (likely(nskb)) {
consume_skb(skb);
skb = nskb;
} else {
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-ENOMEM);
}
} else {
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb) {
macsec_txsa_put(tx_sa);
return ERR_PTR(-ENOMEM);
}
}
unprotected_len = skb->len;
eth = eth_hdr(skb);
sci_present = macsec_send_sci(secy);
hh = skb_push(skb, macsec_extra_len(sci_present));
memmove(hh, eth, 2 * ETH_ALEN);
pn = tx_sa_update_pn(tx_sa, secy);
if (pn.full64 == 0) {
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-ENOLINK);
}
macsec_fill_sectag(hh, secy, pn.lower, sci_present);
macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
skb_put(skb, secy->icv_len);
if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.OutPktsTooLong++;
u64_stats_update_end(&secy_stats->syncp);
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-EINVAL);
}
ret = skb_cow_data(skb, 0, &trailer);
if (unlikely(ret < 0)) {
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(ret);
}
req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
if (!req) {
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-ENOMEM);
}
if (secy->xpn)
macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
else
macsec_fill_iv(iv, secy->sci, pn.lower);
sg_init_table(sg, ret);
ret = skb_to_sgvec(skb, sg, 0, skb->len);
if (unlikely(ret < 0)) {
aead_request_free(req);
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(ret);
}
if (tx_sc->encrypt) {
int len = skb->len - macsec_hdr_len(sci_present) -
secy->icv_len;
aead_request_set_crypt(req, sg, sg, len, iv);
aead_request_set_ad(req, macsec_hdr_len(sci_present));
} else {
aead_request_set_crypt(req, sg, sg, 0, iv);
aead_request_set_ad(req, skb->len - secy->icv_len);
}
macsec_skb_cb(skb)->req = req;
macsec_skb_cb(skb)->tx_sa = tx_sa;
macsec_skb_cb(skb)->has_sci = sci_present;
aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
dev_hold(skb->dev);
ret = crypto_aead_encrypt(req);
if (ret == -EINPROGRESS) {
return ERR_PTR(ret);
} else if (ret != 0) {
dev_put(skb->dev);
kfree_skb(skb);
aead_request_free(req);
macsec_txsa_put(tx_sa);
return ERR_PTR(-EINVAL);
}
dev_put(skb->dev);
aead_request_free(req);
macsec_txsa_put(tx_sa);
return skb;
}
static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
{
struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
struct macsec_eth_header *hdr = macsec_ethhdr(skb);
u32 lowest_pn = 0;
spin_lock(&rx_sa->lock);
if (rx_sa->next_pn_halves.lower >= secy->replay_window)
lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
/* Now perform replay protection check again
* (see IEEE 802.1AE-2006 figure 10-5)
*/
if (secy->replay_protect && pn < lowest_pn &&
(!secy->xpn || pn_same_half(pn, lowest_pn))) {
spin_unlock(&rx_sa->lock);
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsLate++;
u64_stats_update_end(&rxsc_stats->syncp);
DEV_STATS_INC(secy->netdev, rx_dropped);
return false;
}
if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
unsigned int msdu_len = macsec_msdu_len(skb);
u64_stats_update_begin(&rxsc_stats->syncp);
if (hdr->tci_an & MACSEC_TCI_E)
rxsc_stats->stats.InOctetsDecrypted += msdu_len;
else
rxsc_stats->stats.InOctetsValidated += msdu_len;
u64_stats_update_end(&rxsc_stats->syncp);
}
if (!macsec_skb_cb(skb)->valid) {
spin_unlock(&rx_sa->lock);
/* 10.6.5 */
if (hdr->tci_an & MACSEC_TCI_C ||
secy->validate_frames == MACSEC_VALIDATE_STRICT) {
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsNotValid++;
u64_stats_update_end(&rxsc_stats->syncp);
this_cpu_inc(rx_sa->stats->InPktsNotValid);
DEV_STATS_INC(secy->netdev, rx_errors);
return false;
}
u64_stats_update_begin(&rxsc_stats->syncp);
if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
rxsc_stats->stats.InPktsInvalid++;
this_cpu_inc(rx_sa->stats->InPktsInvalid);
} else if (pn < lowest_pn) {
rxsc_stats->stats.InPktsDelayed++;
} else {
rxsc_stats->stats.InPktsUnchecked++;
}
u64_stats_update_end(&rxsc_stats->syncp);
} else {
u64_stats_update_begin(&rxsc_stats->syncp);
if (pn < lowest_pn) {
rxsc_stats->stats.InPktsDelayed++;
} else {
rxsc_stats->stats.InPktsOK++;
this_cpu_inc(rx_sa->stats->InPktsOK);
}
u64_stats_update_end(&rxsc_stats->syncp);
// Instead of "pn >=" - to support pn overflow in xpn
if (pn + 1 > rx_sa->next_pn_halves.lower) {
rx_sa->next_pn_halves.lower = pn + 1;
} else if (secy->xpn &&
!pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
rx_sa->next_pn_halves.upper++;
rx_sa->next_pn_halves.lower = pn + 1;
}
spin_unlock(&rx_sa->lock);
}
return true;
}
static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
{
skb->pkt_type = PACKET_HOST;
skb->protocol = eth_type_trans(skb, dev);
skb_reset_network_header(skb);
if (!skb_transport_header_was_set(skb))
skb_reset_transport_header(skb);
skb_reset_mac_len(skb);
}
static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
{
skb->ip_summed = CHECKSUM_NONE;
memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
skb_pull(skb, hdr_len);
pskb_trim_unique(skb, skb->len - icv_len);
}
static void count_rx(struct net_device *dev, int len)
{
dev_sw_netstats_rx_add(dev, len);
}
static void macsec_decrypt_done(void *data, int err)
{
struct sk_buff *skb = data;
struct net_device *dev = skb->dev;
struct macsec_dev *macsec = macsec_priv(dev);
struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
struct macsec_rx_sc *rx_sc = rx_sa->sc;
int len;
u32 pn;
aead_request_free(macsec_skb_cb(skb)->req);
if (!err)
macsec_skb_cb(skb)->valid = true;
rcu_read_lock_bh();
pn = ntohl(macsec_ethhdr(skb)->packet_number);
if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
rcu_read_unlock_bh();
kfree_skb(skb);
goto out;
}
macsec_finalize_skb(skb, macsec->secy.icv_len,
macsec_extra_len(macsec_skb_cb(skb)->has_sci));
len = skb->len;
macsec_reset_skb(skb, macsec->secy.netdev);
if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
count_rx(dev, len);
rcu_read_unlock_bh();
out:
macsec_rxsa_put(rx_sa);
macsec_rxsc_put(rx_sc);
dev_put(dev);
}
static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
struct net_device *dev,
struct macsec_rx_sa *rx_sa,
sci_t sci,
struct macsec_secy *secy)
{
int ret;
struct scatterlist *sg;
struct sk_buff *trailer;
unsigned char *iv;
struct aead_request *req;
struct macsec_eth_header *hdr;
u32 hdr_pn;
u16 icv_len = secy->icv_len;
macsec_skb_cb(skb)->valid = false;
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
ret = skb_cow_data(skb, 0, &trailer);
if (unlikely(ret < 0)) {
kfree_skb(skb);
return ERR_PTR(ret);
}
req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
if (!req) {
kfree_skb(skb);
return ERR_PTR(-ENOMEM);
}
hdr = (struct macsec_eth_header *)skb->data;
hdr_pn = ntohl(hdr->packet_number);
if (secy->xpn) {
pn_t recovered_pn = rx_sa->next_pn_halves;
recovered_pn.lower = hdr_pn;
if (hdr_pn < rx_sa->next_pn_halves.lower &&
!pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
recovered_pn.upper++;
macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
rx_sa->key.salt);
} else {
macsec_fill_iv(iv, sci, hdr_pn);
}
sg_init_table(sg, ret);
ret = skb_to_sgvec(skb, sg, 0, skb->len);
if (unlikely(ret < 0)) {
aead_request_free(req);
kfree_skb(skb);
return ERR_PTR(ret);
}
if (hdr->tci_an & MACSEC_TCI_E) {
/* confidentiality: ethernet + macsec header
* authenticated, encrypted payload
*/
int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
aead_request_set_crypt(req, sg, sg, len, iv);
aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb) {
aead_request_free(req);
return ERR_PTR(-ENOMEM);
}
} else {
/* integrity only: all headers + data authenticated */
aead_request_set_crypt(req, sg, sg, icv_len, iv);
aead_request_set_ad(req, skb->len - icv_len);
}
macsec_skb_cb(skb)->req = req;
skb->dev = dev;
aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
dev_hold(dev);
ret = crypto_aead_decrypt(req);
if (ret == -EINPROGRESS) {
return ERR_PTR(ret);
} else if (ret != 0) {
/* decryption/authentication failed
* 10.6 if validateFrames is disabled, deliver anyway
*/
if (ret != -EBADMSG) {
kfree_skb(skb);
skb = ERR_PTR(ret);
}
} else {
macsec_skb_cb(skb)->valid = true;
}
dev_put(dev);
aead_request_free(req);
return skb;
}
static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
{
struct macsec_rx_sc *rx_sc;
for_each_rxsc(secy, rx_sc) {
if (rx_sc->sci == sci)
return rx_sc;
}
return NULL;
}
static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
{
struct macsec_rx_sc *rx_sc;
for_each_rxsc_rtnl(secy, rx_sc) {
if (rx_sc->sci == sci)
return rx_sc;
}
return NULL;
}
static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
{
/* Deliver to the uncontrolled port by default */
enum rx_handler_result ret = RX_HANDLER_PASS;
struct ethhdr *hdr = eth_hdr(skb);
struct metadata_dst *md_dst;
struct macsec_rxh_data *rxd;
struct macsec_dev *macsec;
bool is_macsec_md_dst;
rcu_read_lock();
rxd = macsec_data_rcu(skb->dev);
md_dst = skb_metadata_dst(skb);
is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC;
list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
struct sk_buff *nskb;
struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
struct net_device *ndev = macsec->secy.netdev;
/* If h/w offloading is enabled, HW decodes frames and strips
* the SecTAG, so we have to deduce which port to deliver to.
*/
if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
const struct macsec_ops *ops;
ops = macsec_get_ops(macsec, NULL);
if (ops->rx_uses_md_dst && !is_macsec_md_dst)
continue;
if (is_macsec_md_dst) {
struct macsec_rx_sc *rx_sc;
/* All drivers that implement MACsec offload
* support using skb metadata destinations must
* indicate that they do so.
*/
DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst);
rx_sc = find_rx_sc(&macsec->secy,
md_dst->u.macsec_info.sci);
if (!rx_sc)
continue;
/* device indicated macsec offload occurred */
skb->dev = ndev;
skb->pkt_type = PACKET_HOST;
eth_skb_pkt_type(skb, ndev);
ret = RX_HANDLER_ANOTHER;
goto out;
}
/* This datapath is insecure because it is unable to
* enforce isolation of broadcast/multicast traffic and
* unicast traffic with promiscuous mode on the macsec
* netdev. Since the core stack has no mechanism to
* check that the hardware did indeed receive MACsec
* traffic, it is possible that the response handling
* done by the MACsec port was to a plaintext packet.
* This violates the MACsec protocol standard.
*/
if (ether_addr_equal_64bits(hdr->h_dest,
ndev->dev_addr)) {
/* exact match, divert skb to this port */
skb->dev = ndev;
skb->pkt_type = PACKET_HOST;
ret = RX_HANDLER_ANOTHER;
goto out;
} else if (is_multicast_ether_addr_64bits(
hdr->h_dest)) {
/* multicast frame, deliver on this port too */
nskb = skb_clone(skb, GFP_ATOMIC);
if (!nskb)
break;
nskb->dev = ndev;
eth_skb_pkt_type(nskb, ndev);
__netif_rx(nskb);
} else if (ndev->flags & IFF_PROMISC) {
skb->dev = ndev;
skb->pkt_type = PACKET_HOST;
ret = RX_HANDLER_ANOTHER;
goto out;
}
continue;
}
/* 10.6 If the management control validateFrames is not
* Strict, frames without a SecTAG are received, counted, and
* delivered to the Controlled Port
*/
if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsNoTag++;
u64_stats_update_end(&secy_stats->syncp);
DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
continue;
}
/* deliver on this port */
nskb = skb_clone(skb, GFP_ATOMIC);
if (!nskb)
break;
nskb->dev = ndev;
if (__netif_rx(nskb) == NET_RX_SUCCESS) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsUntagged++;
u64_stats_update_end(&secy_stats->syncp);
}
}
out:
rcu_read_unlock();
return ret;
}
static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
struct net_device *dev = skb->dev;
struct macsec_eth_header *hdr;
struct macsec_secy *secy = NULL;
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
struct macsec_rxh_data *rxd;
struct macsec_dev *macsec;
unsigned int len;
sci_t sci;
u32 hdr_pn;
bool cbit;
struct pcpu_rx_sc_stats *rxsc_stats;
struct pcpu_secy_stats *secy_stats;
bool pulled_sci;
int ret;
if (skb_headroom(skb) < ETH_HLEN)
goto drop_direct;
hdr = macsec_ethhdr(skb);
if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
return handle_not_macsec(skb);
skb = skb_unshare(skb, GFP_ATOMIC);
*pskb = skb;
if (!skb)
return RX_HANDLER_CONSUMED;
pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
if (!pulled_sci) {
if (!pskb_may_pull(skb, macsec_extra_len(false)))
goto drop_direct;
}
hdr = macsec_ethhdr(skb);
/* Frames with a SecTAG that has the TCI E bit set but the C
* bit clear are discarded, as this reserved encoding is used
* to identify frames with a SecTAG that are not to be
* delivered to the Controlled Port.
*/
if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
return RX_HANDLER_PASS;
/* now, pull the extra length */
if (hdr->tci_an & MACSEC_TCI_SC) {
if (!pulled_sci)
goto drop_direct;
}
/* ethernet header is part of crypto processing */
skb_push(skb, ETH_HLEN);
macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
rcu_read_lock();
rxd = macsec_data_rcu(skb->dev);
list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
sc = sc ? macsec_rxsc_get(sc) : NULL;
if (sc) {
secy = &macsec->secy;
rx_sc = sc;
break;
}
}
if (!secy)
goto nosci;
dev = secy->netdev;
macsec = macsec_priv(dev);
secy_stats = this_cpu_ptr(macsec->stats);
rxsc_stats = this_cpu_ptr(rx_sc->stats);
if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsBadTag++;
u64_stats_update_end(&secy_stats->syncp);
DEV_STATS_INC(secy->netdev, rx_errors);
goto drop_nosa;
}
rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
if (!rx_sa) {
/* 10.6.1 if the SA is not in use */
/* If validateFrames is Strict or the C bit in the
* SecTAG is set, discard
*/
struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc);
if (hdr->tci_an & MACSEC_TCI_C ||
secy->validate_frames == MACSEC_VALIDATE_STRICT) {
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsNotUsingSA++;
u64_stats_update_end(&rxsc_stats->syncp);
DEV_STATS_INC(secy->netdev, rx_errors);
if (active_rx_sa)
this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA);
goto drop_nosa;
}
/* not Strict, the frame (with the SecTAG and ICV
* removed) is delivered to the Controlled Port.
*/
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsUnusedSA++;
u64_stats_update_end(&rxsc_stats->syncp);
if (active_rx_sa)
this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA);
goto deliver;
}
/* First, PN check to avoid decrypting obviously wrong packets */
hdr_pn = ntohl(hdr->packet_number);
if (secy->replay_protect) {
bool late;
spin_lock(&rx_sa->lock);
late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
if (secy->xpn)
late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
spin_unlock(&rx_sa->lock);
if (late) {
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsLate++;
u64_stats_update_end(&rxsc_stats->syncp);
DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
goto drop;
}
}
macsec_skb_cb(skb)->rx_sa = rx_sa;
/* Disabled && !changed text => skip validation */
if (hdr->tci_an & MACSEC_TCI_C ||
secy->validate_frames != MACSEC_VALIDATE_DISABLED)
skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
if (IS_ERR(skb)) {
/* the decrypt callback needs the reference */
if (PTR_ERR(skb) != -EINPROGRESS) {
macsec_rxsa_put(rx_sa);
macsec_rxsc_put(rx_sc);
}
rcu_read_unlock();
*pskb = NULL;
return RX_HANDLER_CONSUMED;
}
if (!macsec_post_decrypt(skb, secy, hdr_pn))
goto drop;
deliver:
macsec_finalize_skb(skb, secy->icv_len,
macsec_extra_len(macsec_skb_cb(skb)->has_sci));
len = skb->len;
macsec_reset_skb(skb, secy->netdev);
if (rx_sa)
macsec_rxsa_put(rx_sa);
macsec_rxsc_put(rx_sc);
skb_orphan(skb);
ret = gro_cells_receive(&macsec->gro_cells, skb);
if (ret == NET_RX_SUCCESS)
count_rx(dev, len);
else
DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
rcu_read_unlock();
*pskb = NULL;
return RX_HANDLER_CONSUMED;
drop:
macsec_rxsa_put(rx_sa);
drop_nosa:
macsec_rxsc_put(rx_sc);
rcu_read_unlock();
drop_direct:
kfree_skb(skb);
*pskb = NULL;
return RX_HANDLER_CONSUMED;
nosci:
/* 10.6.1 if the SC is not found */
cbit = !!(hdr->tci_an & MACSEC_TCI_C);
if (!cbit)
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) {
struct sk_buff *nskb;
secy_stats = this_cpu_ptr(macsec->stats);
/* If validateFrames is Strict or the C bit in the
* SecTAG is set, discard
*/
if (cbit ||
macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsNoSCI++;
u64_stats_update_end(&secy_stats->syncp);
DEV_STATS_INC(macsec->secy.netdev, rx_errors);
continue;
}
/* not strict, the frame (with the SecTAG and ICV
* removed) is delivered to the Controlled Port.
*/
nskb = skb_clone(skb, GFP_ATOMIC);
if (!nskb)
break;
macsec_reset_skb(nskb, macsec->secy.netdev);
ret = __netif_rx(nskb);
if (ret == NET_RX_SUCCESS) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsUnknownSCI++;
u64_stats_update_end(&secy_stats->syncp);
} else {
DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
}
}
rcu_read_unlock();
*pskb = skb;
return RX_HANDLER_PASS;
}
static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
{
struct crypto_aead *tfm;
int ret;
tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
if (IS_ERR(tfm))
return tfm;
ret = crypto_aead_setkey(tfm, key, key_len);
if (ret < 0)
goto fail;
ret = crypto_aead_setauthsize(tfm, icv_len);
if (ret < 0)
goto fail;
return tfm;
fail:
crypto_free_aead(tfm);
return ERR_PTR(ret);
}
static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
int icv_len)
{
rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
if (!rx_sa->stats)
return -ENOMEM;
rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
if (IS_ERR(rx_sa->key.tfm)) {
free_percpu(rx_sa->stats);
return PTR_ERR(rx_sa->key.tfm);
}
rx_sa->ssci = MACSEC_UNDEF_SSCI;
rx_sa->active = false;
rx_sa->next_pn = 1;
refcount_set(&rx_sa->refcnt, 1);
spin_lock_init(&rx_sa->lock);
return 0;
}
static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
{
rx_sa->active = false;
macsec_rxsa_put(rx_sa);
}
static void free_rx_sc(struct macsec_rx_sc *rx_sc)
{
int i;
for (i = 0; i < MACSEC_NUM_AN; i++) {
struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
RCU_INIT_POINTER(rx_sc->sa[i], NULL);
if (sa)
clear_rx_sa(sa);
}
macsec_rxsc_put(rx_sc);
}
static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
{
struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
rx_sc;
rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
if (rx_sc->sci == sci) {
if (rx_sc->active)
secy->n_rx_sc--;
rcu_assign_pointer(*rx_scp, rx_sc->next);
return rx_sc;
}
}
return NULL;
}
static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
bool active)
{
struct macsec_rx_sc *rx_sc;
struct macsec_dev *macsec;
struct net_device *real_dev = macsec_priv(dev)->real_dev;
struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
struct macsec_secy *secy;
list_for_each_entry(macsec, &rxd->secys, secys) {
if (find_rx_sc_rtnl(&macsec->secy, sci))
return ERR_PTR(-EEXIST);
}
rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
if (!rx_sc)
return ERR_PTR(-ENOMEM);
rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
if (!rx_sc->stats) {
kfree(rx_sc);
return ERR_PTR(-ENOMEM);
}
rx_sc->sci = sci;
rx_sc->active = active;
refcount_set(&rx_sc->refcnt, 1);
secy = &macsec_priv(dev)->secy;
rcu_assign_pointer(rx_sc->next, secy->rx_sc);
rcu_assign_pointer(secy->rx_sc, rx_sc);
if (rx_sc->active)
secy->n_rx_sc++;
return rx_sc;
}
static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
int icv_len)
{
tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
if (!tx_sa->stats)
return -ENOMEM;
tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
if (IS_ERR(tx_sa->key.tfm)) {
free_percpu(tx_sa->stats);
return PTR_ERR(tx_sa->key.tfm);
}
tx_sa->ssci = MACSEC_UNDEF_SSCI;
tx_sa->active = false;
refcount_set(&tx_sa->refcnt, 1);
spin_lock_init(&tx_sa->lock);
return 0;
}
static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
{
tx_sa->active = false;
macsec_txsa_put(tx_sa);
}
static struct genl_family macsec_fam;
static struct net_device *get_dev_from_nl(struct net *net,
struct nlattr **attrs)
{
int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
struct net_device *dev;
dev = __dev_get_by_index(net, ifindex);
if (!dev)
return ERR_PTR(-ENODEV);
if (!netif_is_macsec(dev))
return ERR_PTR(-ENODEV);
return dev;
}
static enum macsec_offload nla_get_offload(const struct nlattr *nla)
{
return (__force enum macsec_offload)nla_get_u8(nla);
}
static sci_t nla_get_sci(const struct nlattr *nla)
{
return (__force sci_t)nla_get_u64(nla);
}
static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
int padattr)
{
return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
}
static ssci_t nla_get_ssci(const struct nlattr *nla)
{
return (__force ssci_t)nla_get_u32(nla);
}
static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
{
return nla_put_u32(skb, attrtype, (__force u64)value);
}
static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
struct nlattr **attrs,
struct nlattr **tb_sa,
struct net_device **devp,
struct macsec_secy **secyp,
struct macsec_tx_sc **scp,
u8 *assoc_num)
{
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
if (!tb_sa[MACSEC_SA_ATTR_AN])
return ERR_PTR(-EINVAL);
*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
dev = get_dev_from_nl(net, attrs);
if (IS_ERR(dev))
return ERR_CAST(dev);
if (*assoc_num >= MACSEC_NUM_AN)
return ERR_PTR(-EINVAL);
secy = &macsec_priv(dev)->secy;
tx_sc = &secy->tx_sc;
tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
if (!tx_sa)
return ERR_PTR(-ENODEV);
*devp = dev;
*scp = tx_sc;
*secyp = secy;
return tx_sa;
}
static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
struct nlattr **attrs,
struct nlattr **tb_rxsc,
struct net_device **devp,
struct macsec_secy **secyp)
{
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
sci_t sci;
dev = get_dev_from_nl(net, attrs);
if (IS_ERR(dev))
return ERR_CAST(dev);
secy = &macsec_priv(dev)->secy;
if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
return ERR_PTR(-EINVAL);
sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
rx_sc = find_rx_sc_rtnl(secy, sci);
if (!rx_sc)
return ERR_PTR(-ENODEV);
*secyp = secy;
*devp = dev;
return rx_sc;
}
static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
struct nlattr **attrs,
struct nlattr **tb_rxsc,
struct nlattr **tb_sa,
struct net_device **devp,
struct macsec_secy **secyp,
struct macsec_rx_sc **scp,
u8 *assoc_num)
{
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
if (!tb_sa[MACSEC_SA_ATTR_AN])
return ERR_PTR(-EINVAL);
*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
if (*assoc_num >= MACSEC_NUM_AN)
return ERR_PTR(-EINVAL);
rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
if (IS_ERR(rx_sc))
return ERR_CAST(rx_sc);
rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
if (!rx_sa)
return ERR_PTR(-ENODEV);
*scp = rx_sc;
return rx_sa;
}
static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
[MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
[MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
[MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
[MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
};
static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
[MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
[MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
};
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] = NLA_POLICY_MIN_LEN(4),
[MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
.len = MACSEC_KEYID_LEN, },
[MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
.len = MACSEC_MAX_KEY_LEN, },
[MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
[MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
.len = MACSEC_SALT_LEN, },
};
static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
[MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
};
/* Offloads an operation to a device driver */
static int macsec_offload(int (* const func)(struct macsec_context *),
struct macsec_context *ctx)
{
int ret;
if (unlikely(!func))
return 0;
if (ctx->offload == MACSEC_OFFLOAD_PHY)
mutex_lock(&ctx->phydev->lock);
ret = (*func)(ctx);
if (ctx->offload == MACSEC_OFFLOAD_PHY)
mutex_unlock(&ctx->phydev->lock);
return ret;
}
static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
{
if (!attrs[MACSEC_ATTR_SA_CONFIG])
return -EINVAL;
if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
return -EINVAL;
return 0;
}
static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
{
if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
return -EINVAL;
if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
return -EINVAL;
return 0;
}
static bool validate_add_rxsa(struct nlattr **attrs)
{
if (!attrs[MACSEC_SA_ATTR_AN] ||
!attrs[MACSEC_SA_ATTR_KEY] ||
!attrs[MACSEC_SA_ATTR_KEYID])
return false;
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;
if (attrs[MACSEC_SA_ATTR_PN] &&
nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;
if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
return false;
}
if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
return false;
return true;
}
static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
struct nlattr **attrs = info->attrs;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
unsigned char assoc_num;
int pn_len;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
int err;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (!validate_add_rxsa(tb_sa))
return -EINVAL;
rtnl_lock();
rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
if (IS_ERR(rx_sc)) {
rtnl_unlock();
return PTR_ERR(rx_sc);
}
assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
rtnl_unlock();
return -EINVAL;
}
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
if (tb_sa[MACSEC_SA_ATTR_PN] &&
nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
rtnl_unlock();
return -EINVAL;
}
if (secy->xpn) {
if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
rtnl_unlock();
return -EINVAL;
}
if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
MACSEC_SALT_LEN);
rtnl_unlock();
return -EINVAL;
}
}
rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
if (rx_sa) {
rtnl_unlock();
return -EBUSY;
}
rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
if (!rx_sa) {
rtnl_unlock();
return -ENOMEM;
}
err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
secy->key_len, secy->icv_len);
if (err < 0) {
kfree(rx_sa);
rtnl_unlock();
return err;
}
if (tb_sa[MACSEC_SA_ATTR_PN]) {
spin_lock_bh(&rx_sa->lock);
rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&rx_sa->lock);
}
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
rx_sa->sc = rx_sc;
if (secy->xpn) {
rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
MACSEC_SALT_LEN);
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
err = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.rx_sa = rx_sa;
ctx.secy = secy;
memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
secy->key_len);
err = macsec_offload(ops->mdo_add_rxsa, &ctx);
memzero_explicit(ctx.sa.key, secy->key_len);
if (err)
goto cleanup;
}
nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
rtnl_unlock();
return 0;
cleanup:
macsec_rxsa_put(rx_sa);
rtnl_unlock();
return err;
}
static bool validate_add_rxsc(struct nlattr **attrs)
{
if (!attrs[MACSEC_RXSC_ATTR_SCI])
return false;
if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
return false;
}
return true;
}
static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
sci_t sci = MACSEC_UNDEF_SCI;
struct nlattr **attrs = info->attrs;
struct macsec_rx_sc *rx_sc;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
struct macsec_secy *secy;
bool active = true;
int ret;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (!validate_add_rxsc(tb_rxsc))
return -EINVAL;
rtnl_lock();
dev = get_dev_from_nl(genl_info_net(info), attrs);
if (IS_ERR(dev)) {
rtnl_unlock();
return PTR_ERR(dev);
}
secy = &macsec_priv(dev)->secy;
sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
rx_sc = create_rx_sc(dev, sci, active);
if (IS_ERR(rx_sc)) {
rtnl_unlock();
return PTR_ERR(rx_sc);
}
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.rx_sc = rx_sc;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
if (ret)
goto cleanup;
}
rtnl_unlock();
return 0;
cleanup:
del_rx_sc(secy, sci);
free_rx_sc(rx_sc);
rtnl_unlock();
return ret;
}
static bool validate_add_txsa(struct nlattr **attrs)
{
if (!attrs[MACSEC_SA_ATTR_AN] ||
!attrs[MACSEC_SA_ATTR_PN] ||
!attrs[MACSEC_SA_ATTR_KEY] ||
!attrs[MACSEC_SA_ATTR_KEYID])
return false;
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;
if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;
if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
return false;
}
if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
return false;
return true;
}
static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
struct nlattr **attrs = info->attrs;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
unsigned char assoc_num;
int pn_len;
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
bool was_operational;
int err;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (!validate_add_txsa(tb_sa))
return -EINVAL;
rtnl_lock();
dev = get_dev_from_nl(genl_info_net(info), attrs);
if (IS_ERR(dev)) {
rtnl_unlock();
return PTR_ERR(dev);
}
secy = &macsec_priv(dev)->secy;
tx_sc = &secy->tx_sc;
assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
rtnl_unlock();
return -EINVAL;
}
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
rtnl_unlock();
return -EINVAL;
}
if (secy->xpn) {
if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
rtnl_unlock();
return -EINVAL;
}
if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
MACSEC_SALT_LEN);
rtnl_unlock();
return -EINVAL;
}
}
tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
if (tx_sa) {
rtnl_unlock();
return -EBUSY;
}
tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
if (!tx_sa) {
rtnl_unlock();
return -ENOMEM;
}
err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
secy->key_len, secy->icv_len);
if (err < 0) {
kfree(tx_sa);
rtnl_unlock();
return err;
}
spin_lock_bh(&tx_sa->lock);
tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&tx_sa->lock);
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
was_operational = secy->operational;
if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
secy->operational = true;
if (secy->xpn) {
tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
MACSEC_SALT_LEN);
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
err = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.tx_sa = tx_sa;
ctx.secy = secy;
memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
secy->key_len);
err = macsec_offload(ops->mdo_add_txsa, &ctx);
memzero_explicit(ctx.sa.key, secy->key_len);
if (err)
goto cleanup;
}
nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
rtnl_unlock();
return 0;
cleanup:
secy->operational = was_operational;
macsec_txsa_put(tx_sa);
rtnl_unlock();
return err;
}
static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
u8 assoc_num;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
int ret;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
rtnl_lock();
rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
&dev, &secy, &rx_sc, &assoc_num);
if (IS_ERR(rx_sa)) {
rtnl_unlock();
return PTR_ERR(rx_sa);
}
if (rx_sa->active) {
rtnl_unlock();
return -EBUSY;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.rx_sa = rx_sa;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
if (ret)
goto cleanup;
}
RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
clear_rx_sa(rx_sa);
rtnl_unlock();
return 0;
cleanup:
rtnl_unlock();
return ret;
}
static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
sci_t sci;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
int ret;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
return -EINVAL;
rtnl_lock();
dev = get_dev_from_nl(genl_info_net(info), info->attrs);
if (IS_ERR(dev)) {
rtnl_unlock();
return PTR_ERR(dev);
}
secy = &macsec_priv(dev)->secy;
sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
rx_sc = del_rx_sc(secy, sci);
if (!rx_sc) {
rtnl_unlock();
return -ENODEV;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.rx_sc = rx_sc;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
if (ret)
goto cleanup;
}
free_rx_sc(rx_sc);
rtnl_unlock();
return 0;
cleanup:
rtnl_unlock();
return ret;
}
static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
u8 assoc_num;
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
int ret;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
rtnl_lock();
tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
&dev, &secy, &tx_sc, &assoc_num);
if (IS_ERR(tx_sa)) {
rtnl_unlock();
return PTR_ERR(tx_sa);
}
if (tx_sa->active) {
rtnl_unlock();
return -EBUSY;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.tx_sa = tx_sa;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_del_txsa, &ctx);
if (ret)
goto cleanup;
}
RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
clear_tx_sa(tx_sa);
rtnl_unlock();
return 0;
cleanup:
rtnl_unlock();
return ret;
}
static bool validate_upd_sa(struct nlattr **attrs)
{
if (!attrs[MACSEC_SA_ATTR_AN] ||
attrs[MACSEC_SA_ATTR_KEY] ||
attrs[MACSEC_SA_ATTR_KEYID] ||
attrs[MACSEC_SA_ATTR_SSCI] ||
attrs[MACSEC_SA_ATTR_SALT])
return false;
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;
if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;
if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
return false;
}
return true;
}
static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
u8 assoc_num;
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
bool was_operational, was_active;
pn_t prev_pn;
int ret = 0;
prev_pn.full64 = 0;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (!validate_upd_sa(tb_sa))
return -EINVAL;
rtnl_lock();
tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
&dev, &secy, &tx_sc, &assoc_num);
if (IS_ERR(tx_sa)) {
rtnl_unlock();
return PTR_ERR(tx_sa);
}
if (tb_sa[MACSEC_SA_ATTR_PN]) {
int pn_len;
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
rtnl_unlock();
return -EINVAL;
}
spin_lock_bh(&tx_sa->lock);
prev_pn = tx_sa->next_pn_halves;
tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&tx_sa->lock);
}
was_active = tx_sa->active;
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
was_operational = secy->operational;
if (assoc_num == tx_sc->encoding_sa)
secy->operational = tx_sa->active;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.tx_sa = tx_sa;
ctx.sa.update_pn = !!prev_pn.full64;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
if (ret)
goto cleanup;
}
rtnl_unlock();
return 0;
cleanup:
if (tb_sa[MACSEC_SA_ATTR_PN]) {
spin_lock_bh(&tx_sa->lock);
tx_sa->next_pn_halves = prev_pn;
spin_unlock_bh(&tx_sa->lock);
}
tx_sa->active = was_active;
secy->operational = was_operational;
rtnl_unlock();
return ret;
}
static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
u8 assoc_num;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
bool was_active;
pn_t prev_pn;
int ret = 0;
prev_pn.full64 = 0;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (!validate_upd_sa(tb_sa))
return -EINVAL;
rtnl_lock();
rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
&dev, &secy, &rx_sc, &assoc_num);
if (IS_ERR(rx_sa)) {
rtnl_unlock();
return PTR_ERR(rx_sa);
}
if (tb_sa[MACSEC_SA_ATTR_PN]) {
int pn_len;
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
rtnl_unlock();
return -EINVAL;
}
spin_lock_bh(&rx_sa->lock);
prev_pn = rx_sa->next_pn_halves;
rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&rx_sa->lock);
}
was_active = rx_sa->active;
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.rx_sa = rx_sa;
ctx.sa.update_pn = !!prev_pn.full64;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
if (ret)
goto cleanup;
}
rtnl_unlock();
return 0;
cleanup:
if (tb_sa[MACSEC_SA_ATTR_PN]) {
spin_lock_bh(&rx_sa->lock);
rx_sa->next_pn_halves = prev_pn;
spin_unlock_bh(&rx_sa->lock);
}
rx_sa->active = was_active;
rtnl_unlock();
return ret;
}
static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
unsigned int prev_n_rx_sc;
bool was_active;
int ret;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (!validate_add_rxsc(tb_rxsc))
return -EINVAL;
rtnl_lock();
rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
if (IS_ERR(rx_sc)) {
rtnl_unlock();
return PTR_ERR(rx_sc);
}
was_active = rx_sc->active;
prev_n_rx_sc = secy->n_rx_sc;
if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
if (rx_sc->active != new)
secy->n_rx_sc += new ? 1 : -1;
rx_sc->active = new;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.rx_sc = rx_sc;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
if (ret)
goto cleanup;
}
rtnl_unlock();
return 0;
cleanup:
secy->n_rx_sc = prev_n_rx_sc;
rx_sc->active = was_active;
rtnl_unlock();
return ret;
}
static bool macsec_is_configured(struct macsec_dev *macsec)
{
struct macsec_secy *secy = &macsec->secy;
struct macsec_tx_sc *tx_sc = &secy->tx_sc;
int i;
if (secy->rx_sc)
return true;
for (i = 0; i < MACSEC_NUM_AN; i++)
if (tx_sc->sa[i])
return true;
return false;
}
static bool macsec_needs_tx_tag(struct macsec_dev *macsec,
const struct macsec_ops *ops)
{
return macsec->offload == MACSEC_OFFLOAD_PHY &&
ops->mdo_insert_tx_tag;
}
static void macsec_set_head_tail_room(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
int needed_headroom, needed_tailroom;
const struct macsec_ops *ops;
ops = macsec_get_ops(macsec, NULL);
if (ops) {
needed_headroom = ops->needed_headroom;
needed_tailroom = ops->needed_tailroom;
} else {
needed_headroom = MACSEC_NEEDED_HEADROOM;
needed_tailroom = MACSEC_NEEDED_TAILROOM;
}
dev->needed_headroom = real_dev->needed_headroom + needed_headroom;
dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom;
}
static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload)
{
enum macsec_offload prev_offload;
const struct macsec_ops *ops;
struct macsec_context ctx;
struct macsec_dev *macsec;
int ret = 0;
macsec = macsec_priv(dev);
/* Check if the offloading mode is supported by the underlying layers */
if (offload != MACSEC_OFFLOAD_OFF &&
!macsec_check_offload(offload, macsec))
return -EOPNOTSUPP;
/* Check if the net device is busy. */
if (netif_running(dev))
return -EBUSY;
/* Check if the device already has rules configured: we do not support
* rules migration.
*/
if (macsec_is_configured(macsec))
return -EBUSY;
prev_offload = macsec->offload;
ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
macsec, &ctx);
if (!ops)
return -EOPNOTSUPP;
macsec->offload = offload;
ctx.secy = &macsec->secy;
ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx)
: macsec_offload(ops->mdo_add_secy, &ctx);
if (ret) {
macsec->offload = prev_offload;
return ret;
}
macsec_set_head_tail_room(dev);
macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops);
return ret;
}
static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
struct nlattr **attrs = info->attrs;
enum macsec_offload offload;
struct macsec_dev *macsec;
struct net_device *dev;
int ret = 0;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (!attrs[MACSEC_ATTR_OFFLOAD])
return -EINVAL;
if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
attrs[MACSEC_ATTR_OFFLOAD],
macsec_genl_offload_policy, NULL))
return -EINVAL;
rtnl_lock();
dev = get_dev_from_nl(genl_info_net(info), attrs);
if (IS_ERR(dev)) {
ret = PTR_ERR(dev);
goto out;
}
macsec = macsec_priv(dev);
if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
ret = -EINVAL;
goto out;
}
offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
if (macsec->offload != offload)
ret = macsec_update_offload(dev, offload);
out:
rtnl_unlock();
return ret;
}
static void get_tx_sa_stats(struct net_device *dev, int an,
struct macsec_tx_sa *tx_sa,
struct macsec_tx_sa_stats *sum)
{
struct macsec_dev *macsec = macsec_priv(dev);
int cpu;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.sa.assoc_num = an;
ctx.sa.tx_sa = tx_sa;
ctx.stats.tx_sa_stats = sum;
ctx.secy = &macsec_priv(dev)->secy;
macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
}
return;
}
for_each_possible_cpu(cpu) {
const struct macsec_tx_sa_stats *stats =
per_cpu_ptr(tx_sa->stats, cpu);
sum->OutPktsProtected += stats->OutPktsProtected;
sum->OutPktsEncrypted += stats->OutPktsEncrypted;
}
}
static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
{
if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
sum->OutPktsProtected) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
sum->OutPktsEncrypted))
return -EMSGSIZE;
return 0;
}
static void get_rx_sa_stats(struct net_device *dev,
struct macsec_rx_sc *rx_sc, int an,
struct macsec_rx_sa *rx_sa,
struct macsec_rx_sa_stats *sum)
{
struct macsec_dev *macsec = macsec_priv(dev);
int cpu;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.sa.assoc_num = an;
ctx.sa.rx_sa = rx_sa;
ctx.stats.rx_sa_stats = sum;
ctx.secy = &macsec_priv(dev)->secy;
ctx.rx_sc = rx_sc;
macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
}
return;
}
for_each_possible_cpu(cpu) {
const struct macsec_rx_sa_stats *stats =
per_cpu_ptr(rx_sa->stats, cpu);
sum->InPktsOK += stats->InPktsOK;
sum->InPktsInvalid += stats->InPktsInvalid;
sum->InPktsNotValid += stats->InPktsNotValid;
sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
sum->InPktsUnusedSA += stats->InPktsUnusedSA;
}
}
static int copy_rx_sa_stats(struct sk_buff *skb,
struct macsec_rx_sa_stats *sum)
{
if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
sum->InPktsInvalid) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
sum->InPktsNotValid) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
sum->InPktsNotUsingSA) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
sum->InPktsUnusedSA))
return -EMSGSIZE;
return 0;
}
static void get_rx_sc_stats(struct net_device *dev,
struct macsec_rx_sc *rx_sc,
struct macsec_rx_sc_stats *sum)
{
struct macsec_dev *macsec = macsec_priv(dev);
int cpu;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.stats.rx_sc_stats = sum;
ctx.secy = &macsec_priv(dev)->secy;
ctx.rx_sc = rx_sc;
macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
}
return;
}
for_each_possible_cpu(cpu) {
const struct pcpu_rx_sc_stats *stats;
struct macsec_rx_sc_stats tmp;
unsigned int start;
stats = per_cpu_ptr(rx_sc->stats, cpu);
do {
start = u64_stats_fetch_begin(&stats->syncp);
memcpy(&tmp, &stats->stats, sizeof(tmp));
} while (u64_stats_fetch_retry(&stats->syncp, start));
sum->InOctetsValidated += tmp.InOctetsValidated;
sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
sum->InPktsUnchecked += tmp.InPktsUnchecked;
sum->InPktsDelayed += tmp.InPktsDelayed;
sum->InPktsOK += tmp.InPktsOK;
sum->InPktsInvalid += tmp.InPktsInvalid;
sum->InPktsLate += tmp.InPktsLate;
sum->InPktsNotValid += tmp.InPktsNotValid;
sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
}
}
static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
{
if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
sum->InOctetsValidated,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
sum->InOctetsDecrypted,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
sum->InPktsUnchecked,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
sum->InPktsDelayed,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
sum->InPktsOK,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
sum->InPktsInvalid,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
sum->InPktsLate,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
sum->InPktsNotValid,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
sum->InPktsNotUsingSA,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
sum->InPktsUnusedSA,
MACSEC_RXSC_STATS_ATTR_PAD))
return -EMSGSIZE;
return 0;
}
static void get_tx_sc_stats(struct net_device *dev,
struct macsec_tx_sc_stats *sum)
{
struct macsec_dev *macsec = macsec_priv(dev);
int cpu;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.stats.tx_sc_stats = sum;
ctx.secy = &macsec_priv(dev)->secy;
macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
}
return;
}
for_each_possible_cpu(cpu) {
const struct pcpu_tx_sc_stats *stats;
struct macsec_tx_sc_stats tmp;
unsigned int start;
stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
do {
start = u64_stats_fetch_begin(&stats->syncp);
memcpy(&tmp, &stats->stats, sizeof(tmp));
} while (u64_stats_fetch_retry(&stats->syncp, start));
sum->OutPktsProtected += tmp.OutPktsProtected;
sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
sum->OutOctetsProtected += tmp.OutOctetsProtected;
sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
}
}
static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
{
if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
sum->OutPktsProtected,
MACSEC_TXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
sum->OutPktsEncrypted,
MACSEC_TXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
sum->OutOctetsProtected,
MACSEC_TXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
sum->OutOctetsEncrypted,
MACSEC_TXSC_STATS_ATTR_PAD))
return -EMSGSIZE;
return 0;
}
static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
{
struct macsec_dev *macsec = macsec_priv(dev);
int cpu;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.stats.dev_stats = sum;
ctx.secy = &macsec_priv(dev)->secy;
macsec_offload(ops->mdo_get_dev_stats, &ctx);
}
return;
}
for_each_possible_cpu(cpu) {
const struct pcpu_secy_stats *stats;
struct macsec_dev_stats tmp;
unsigned int start;
stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
do {
start = u64_stats_fetch_begin(&stats->syncp);
memcpy(&tmp, &stats->stats, sizeof(tmp));
} while (u64_stats_fetch_retry(&stats->syncp, start));
sum->OutPktsUntagged += tmp.OutPktsUntagged;
sum->InPktsUntagged += tmp.InPktsUntagged;
sum->OutPktsTooLong += tmp.OutPktsTooLong;
sum->InPktsNoTag += tmp.InPktsNoTag;
sum->InPktsBadTag += tmp.InPktsBadTag;
sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
sum->InPktsNoSCI += tmp.InPktsNoSCI;
sum->InPktsOverrun += tmp.InPktsOverrun;
}
}
static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
{
if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
sum->OutPktsUntagged,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
sum->InPktsUntagged,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
sum->OutPktsTooLong,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
sum->InPktsNoTag,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
sum->InPktsBadTag,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
sum->InPktsUnknownSCI,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
sum->InPktsNoSCI,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
sum->InPktsOverrun,
MACSEC_SECY_STATS_ATTR_PAD))
return -EMSGSIZE;
return 0;
}
static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
{
struct macsec_tx_sc *tx_sc = &secy->tx_sc;
struct nlattr *secy_nest = nla_nest_start_noflag(skb,
MACSEC_ATTR_SECY);
u64 csid;
if (!secy_nest)
return 1;
switch (secy->key_len) {
case MACSEC_GCM_AES_128_SAK_LEN:
csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
break;
case MACSEC_GCM_AES_256_SAK_LEN:
csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
break;
default:
goto cancel;
}
if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
MACSEC_SECY_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
csid, MACSEC_SECY_ATTR_PAD) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
goto cancel;
if (secy->replay_protect) {
if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
goto cancel;
}
nla_nest_end(skb, secy_nest);
return 0;
cancel:
nla_nest_cancel(skb, secy_nest);
return 1;
}
static noinline_for_stack int
dump_secy(struct macsec_secy *secy, struct net_device *dev,
struct sk_buff *skb, struct netlink_callback *cb)
{
struct macsec_tx_sc_stats tx_sc_stats = {0, };
struct macsec_tx_sa_stats tx_sa_stats = {0, };
struct macsec_rx_sc_stats rx_sc_stats = {0, };
struct macsec_rx_sa_stats rx_sa_stats = {0, };
struct macsec_dev *macsec = netdev_priv(dev);
struct macsec_dev_stats dev_stats = {0, };
struct macsec_tx_sc *tx_sc = &secy->tx_sc;
struct nlattr *txsa_list, *rxsc_list;
struct macsec_rx_sc *rx_sc;
struct nlattr *attr;
void *hdr;
int i, j;
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
&macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
if (!hdr)
return -EMSGSIZE;
genl_dump_check_consistent(cb, hdr);
if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
goto nla_put_failure;
attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
if (!attr)
goto nla_put_failure;
if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
goto nla_put_failure;
nla_nest_end(skb, attr);
if (nla_put_secy(secy, skb))
goto nla_put_failure;
attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
if (!attr)
goto nla_put_failure;
get_tx_sc_stats(dev, &tx_sc_stats);
if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
nla_nest_cancel(skb, attr);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
if (!attr)
goto nla_put_failure;
get_secy_stats(dev, &dev_stats);
if (copy_secy_stats(skb, &dev_stats)) {
nla_nest_cancel(skb, attr);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
if (!txsa_list)
goto nla_put_failure;
for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
struct nlattr *txsa_nest;
u64 pn;
int pn_len;
if (!tx_sa)
continue;
txsa_nest = nla_nest_start_noflag(skb, j++);
if (!txsa_nest) {
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
if (!attr) {
nla_nest_cancel(skb, txsa_nest);
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
nla_nest_cancel(skb, attr);
nla_nest_cancel(skb, txsa_nest);
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
if (secy->xpn) {
pn = tx_sa->next_pn;
pn_len = MACSEC_XPN_PN_LEN;
} else {
pn = tx_sa->next_pn_halves.lower;
pn_len = MACSEC_DEFAULT_PN_LEN;
}
if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
(secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
nla_nest_cancel(skb, txsa_nest);
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
nla_nest_end(skb, txsa_nest);
}
nla_nest_end(skb, txsa_list);
rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
if (!rxsc_list)
goto nla_put_failure;
j = 1;
for_each_rxsc_rtnl(secy, rx_sc) {
int k;
struct nlattr *rxsa_list;
struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
if (!rxsc_nest) {
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
MACSEC_RXSC_ATTR_PAD)) {
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
if (!attr) {
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
nla_nest_cancel(skb, attr);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
rxsa_list = nla_nest_start_noflag(skb,
MACSEC_RXSC_ATTR_SA_LIST);
if (!rxsa_list) {
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
struct nlattr *rxsa_nest;
u64 pn;
int pn_len;
if (!rx_sa)
continue;
rxsa_nest = nla_nest_start_noflag(skb, k++);
if (!rxsa_nest) {
nla_nest_cancel(skb, rxsa_list);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
attr = nla_nest_start_noflag(skb,
MACSEC_SA_ATTR_STATS);
if (!attr) {
nla_nest_cancel(skb, rxsa_list);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
nla_nest_cancel(skb, attr);
nla_nest_cancel(skb, rxsa_list);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
if (secy->xpn) {
pn = rx_sa->next_pn;
pn_len = MACSEC_XPN_PN_LEN;
} else {
pn = rx_sa->next_pn_halves.lower;
pn_len = MACSEC_DEFAULT_PN_LEN;
}
if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
(secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
nla_nest_cancel(skb, rxsa_nest);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
nla_nest_end(skb, rxsa_nest);
}
nla_nest_end(skb, rxsa_list);
nla_nest_end(skb, rxsc_nest);
}
nla_nest_end(skb, rxsc_list);
genlmsg_end(skb, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(skb, hdr);
return -EMSGSIZE;
}
static int macsec_generation = 1; /* protected by RTNL */
static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct net_device *dev;
int dev_idx, d;
dev_idx = cb->args[0];
d = 0;
rtnl_lock();
cb->seq = macsec_generation;
for_each_netdev(net, dev) {
struct macsec_secy *secy;
if (d < dev_idx)
goto next;
if (!netif_is_macsec(dev))
goto next;
secy = &macsec_priv(dev)->secy;
if (dump_secy(secy, dev, skb, cb) < 0)
goto done;
next:
d++;
}
done:
rtnl_unlock();
cb->args[0] = d;
return skb->len;
}
static const struct genl_small_ops macsec_genl_ops[] = {
{
.cmd = MACSEC_CMD_GET_TXSC,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.dumpit = macsec_dump_txsc,
},
{
.cmd = MACSEC_CMD_ADD_RXSC,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_add_rxsc,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_DEL_RXSC,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_del_rxsc,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_UPD_RXSC,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_upd_rxsc,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_ADD_TXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_add_txsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_DEL_TXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_del_txsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_UPD_TXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_upd_txsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_ADD_RXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_add_rxsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_DEL_RXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_del_rxsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_UPD_RXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_upd_rxsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_UPD_OFFLOAD,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_upd_offload,
.flags = GENL_ADMIN_PERM,
},
};
static struct genl_family macsec_fam __ro_after_init = {
.name = MACSEC_GENL_NAME,
.hdrsize = 0,
.version = MACSEC_GENL_VERSION,
.maxattr = MACSEC_ATTR_MAX,
.policy = macsec_genl_policy,
.netnsok = true,
.module = THIS_MODULE,
.small_ops = macsec_genl_ops,
.n_small_ops = ARRAY_SIZE(macsec_genl_ops),
.resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1,
};
static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb,
struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
const struct macsec_ops *ops;
struct phy_device *phydev;
struct macsec_context ctx;
int skb_final_len;
int err;
ops = macsec_get_ops(macsec, &ctx);
skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom +
ops->needed_tailroom;
if (unlikely(skb_final_len > macsec->real_dev->mtu)) {
err = -EINVAL;
goto cleanup;
}
phydev = macsec->real_dev->phydev;
err = skb_ensure_writable_head_tail(skb, dev);
if (unlikely(err < 0))
goto cleanup;
err = ops->mdo_insert_tx_tag(phydev, skb);
if (unlikely(err))
goto cleanup;
return skb;
cleanup:
kfree_skb(skb);
return ERR_PTR(err);
}
static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct macsec_dev *macsec = netdev_priv(dev);
struct macsec_secy *secy = &macsec->secy;
struct pcpu_secy_stats *secy_stats;
int ret, len;
if (macsec_is_offloaded(netdev_priv(dev))) {
struct metadata_dst *md_dst = secy->tx_sc.md_dst;
skb_dst_drop(skb);
dst_hold(&md_dst->dst);
skb_dst_set(skb, &md_dst->dst);
if (macsec->insert_tx_tag) {
skb = macsec_insert_tx_tag(skb, dev);
if (IS_ERR(skb)) {
DEV_STATS_INC(dev, tx_dropped);
return NETDEV_TX_OK;
}
}
skb->dev = macsec->real_dev;
return dev_queue_xmit(skb);
}
/* 10.5 */
if (!secy->protect_frames) {
secy_stats = this_cpu_ptr(macsec->stats);
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.OutPktsUntagged++;
u64_stats_update_end(&secy_stats->syncp);
skb->dev = macsec->real_dev;
len = skb->len;
ret = dev_queue_xmit(skb);
count_tx(dev, ret, len);
return ret;
}
if (!secy->operational) {
kfree_skb(skb);
DEV_STATS_INC(dev, tx_dropped);
return NETDEV_TX_OK;
}
len = skb->len;
skb = macsec_encrypt(skb, dev);
if (IS_ERR(skb)) {
if (PTR_ERR(skb) != -EINPROGRESS)
DEV_STATS_INC(dev, tx_dropped);
return NETDEV_TX_OK;
}
macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
macsec_encrypt_finish(skb, dev);
ret = dev_queue_xmit(skb);
count_tx(dev, ret, len);
return ret;
}
#define MACSEC_FEATURES \
(NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
static int macsec_dev_init(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
int err;
err = gro_cells_init(&macsec->gro_cells, dev);
if (err)
return err;
dev->features = real_dev->features & MACSEC_FEATURES;
dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
macsec_set_head_tail_room(dev);
if (is_zero_ether_addr(dev->dev_addr))
eth_hw_addr_inherit(dev, real_dev);
if (is_zero_ether_addr(dev->broadcast))
memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
/* Get macsec's reference to real_dev */
netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
return 0;
}
static void macsec_dev_uninit(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
gro_cells_destroy(&macsec->gro_cells);
}
static netdev_features_t macsec_fix_features(struct net_device *dev,
netdev_features_t features)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
features &= (real_dev->features & MACSEC_FEATURES) |
NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
features |= NETIF_F_LLTX;
return features;
}
static int macsec_dev_open(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
int err;
err = dev_uc_add(real_dev, dev->dev_addr);
if (err < 0)
return err;
if (dev->flags & IFF_ALLMULTI) {
err = dev_set_allmulti(real_dev, 1);
if (err < 0)
goto del_unicast;
}
if (dev->flags & IFF_PROMISC) {
err = dev_set_promiscuity(real_dev, 1);
if (err < 0)
goto clear_allmulti;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
err = -EOPNOTSUPP;
goto clear_allmulti;
}
ctx.secy = &macsec->secy;
err = macsec_offload(ops->mdo_dev_open, &ctx);
if (err)
goto clear_allmulti;
}
if (netif_carrier_ok(real_dev))
netif_carrier_on(dev);
return 0;
clear_allmulti:
if (dev->flags & IFF_ALLMULTI)
dev_set_allmulti(real_dev, -1);
del_unicast:
dev_uc_del(real_dev, dev->dev_addr);
netif_carrier_off(dev);
return err;
}
static int macsec_dev_stop(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
netif_carrier_off(dev);
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.secy = &macsec->secy;
macsec_offload(ops->mdo_dev_stop, &ctx);
}
}
dev_mc_unsync(real_dev, dev);
dev_uc_unsync(real_dev, dev);
if (dev->flags & IFF_ALLMULTI)
dev_set_allmulti(real_dev, -1);
if (dev->flags & IFF_PROMISC)
dev_set_promiscuity(real_dev, -1);
dev_uc_del(real_dev, dev->dev_addr);
return 0;
}
static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
{
struct net_device *real_dev = macsec_priv(dev)->real_dev;
if (!(dev->flags & IFF_UP))
return;
if (change & IFF_ALLMULTI)
dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
if (change & IFF_PROMISC)
dev_set_promiscuity(real_dev,
dev->flags & IFF_PROMISC ? 1 : -1);
}
static void macsec_dev_set_rx_mode(struct net_device *dev)
{
struct net_device *real_dev = macsec_priv(dev)->real_dev;
dev_mc_sync(real_dev, dev);
dev_uc_sync(real_dev, dev);
}
static int macsec_set_mac_address(struct net_device *dev, void *p)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
struct sockaddr *addr = p;
u8 old_addr[ETH_ALEN];
int err;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
if (dev->flags & IFF_UP) {
err = dev_uc_add(real_dev, addr->sa_data);
if (err < 0)
return err;
}
ether_addr_copy(old_addr, dev->dev_addr);
eth_hw_addr_set(dev, addr->sa_data);
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (!ops) {
err = -EOPNOTSUPP;
goto restore_old_addr;
}
ctx.secy = &macsec->secy;
err = macsec_offload(ops->mdo_upd_secy, &ctx);
if (err)
goto restore_old_addr;
}
if (dev->flags & IFF_UP)
dev_uc_del(real_dev, old_addr);
return 0;
restore_old_addr:
if (dev->flags & IFF_UP)
dev_uc_del(real_dev, addr->sa_data);
eth_hw_addr_set(dev, old_addr);
return err;
}
static int macsec_change_mtu(struct net_device *dev, int new_mtu)
{
struct macsec_dev *macsec = macsec_priv(dev);
unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
if (macsec->real_dev->mtu - extra < new_mtu)
return -ERANGE;
WRITE_ONCE(dev->mtu, new_mtu);
return 0;
}
static void macsec_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *s)
{
if (!dev->tstats)
return;
dev_fetch_sw_netstats(s, dev->tstats);
s->rx_dropped = DEV_STATS_READ(dev, rx_dropped);
s->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
s->rx_errors = DEV_STATS_READ(dev, rx_errors);
}
static int macsec_get_iflink(const struct net_device *dev)
{
return READ_ONCE(macsec_priv(dev)->real_dev->ifindex);
}
static const struct net_device_ops macsec_netdev_ops = {
.ndo_init = macsec_dev_init,
.ndo_uninit = macsec_dev_uninit,
.ndo_open = macsec_dev_open,
.ndo_stop = macsec_dev_stop,
.ndo_fix_features = macsec_fix_features,
.ndo_change_mtu = macsec_change_mtu,
.ndo_set_rx_mode = macsec_dev_set_rx_mode,
.ndo_change_rx_flags = macsec_dev_change_rx_flags,
.ndo_set_mac_address = macsec_set_mac_address,
.ndo_start_xmit = macsec_start_xmit,
.ndo_get_stats64 = macsec_get_stats64,
.ndo_get_iflink = macsec_get_iflink,
};
static const struct device_type macsec_type = {
.name = "macsec",
};
static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
[IFLA_MACSEC_SCI] = { .type = NLA_U64 },
[IFLA_MACSEC_PORT] = { .type = NLA_U16 },
[IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
[IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
[IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
[IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
[IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
[IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
[IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
[IFLA_MACSEC_ES] = { .type = NLA_U8 },
[IFLA_MACSEC_SCB] = { .type = NLA_U8 },
[IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
[IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
[IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 },
};
static void macsec_free_netdev(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
if (macsec->secy.tx_sc.md_dst)
metadata_dst_free(macsec->secy.tx_sc.md_dst);
free_percpu(macsec->stats);
free_percpu(macsec->secy.tx_sc.stats);
/* Get rid of the macsec's reference to real_dev */
netdev_put(macsec->real_dev, &macsec->dev_tracker);
}
static void macsec_setup(struct net_device *dev)
{
ether_setup(dev);
dev->min_mtu = 0;
dev->max_mtu = ETH_MAX_MTU;
dev->priv_flags |= IFF_NO_QUEUE;
dev->netdev_ops = &macsec_netdev_ops;
dev->needs_free_netdev = true;
dev->priv_destructor = macsec_free_netdev;
SET_NETDEV_DEVTYPE(dev, &macsec_type);
eth_zero_addr(dev->broadcast);
}
static int macsec_changelink_common(struct net_device *dev,
struct nlattr *data[])
{
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
secy = &macsec_priv(dev)->secy;
tx_sc = &secy->tx_sc;
if (data[IFLA_MACSEC_ENCODING_SA]) {
struct macsec_tx_sa *tx_sa;
tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
secy->operational = tx_sa && tx_sa->active;
}
if (data[IFLA_MACSEC_ENCRYPT])
tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
if (data[IFLA_MACSEC_PROTECT])
secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
if (data[IFLA_MACSEC_INC_SCI])
tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
if (data[IFLA_MACSEC_ES])
tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
if (data[IFLA_MACSEC_SCB])
tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
if (data[IFLA_MACSEC_REPLAY_PROTECT])
secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
if (data[IFLA_MACSEC_VALIDATION])
secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
if (data[IFLA_MACSEC_CIPHER_SUITE]) {
switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
case MACSEC_CIPHER_ID_GCM_AES_128:
case MACSEC_DEFAULT_CIPHER_ID:
secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
secy->xpn = false;
break;
case MACSEC_CIPHER_ID_GCM_AES_256:
secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
secy->xpn = false;
break;
case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
secy->xpn = true;
break;
case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
secy->xpn = true;
break;
default:
return -EINVAL;
}
}
if (data[IFLA_MACSEC_WINDOW]) {
secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
/* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
* for XPN cipher suites */
if (secy->xpn &&
secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
return -EINVAL;
}
return 0;
}
static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct macsec_dev *macsec = macsec_priv(dev);
bool macsec_offload_state_change = false;
enum macsec_offload offload;
struct macsec_tx_sc tx_sc;
struct macsec_secy secy;
int ret;
if (!data)
return 0;
if (data[IFLA_MACSEC_CIPHER_SUITE] ||
data[IFLA_MACSEC_ICV_LEN] ||
data[IFLA_MACSEC_SCI] ||
data[IFLA_MACSEC_PORT])
return -EINVAL;
/* Keep a copy of unmodified secy and tx_sc, in case the offload
* propagation fails, to revert macsec_changelink_common.
*/
memcpy(&secy, &macsec->secy, sizeof(secy));
memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
ret = macsec_changelink_common(dev, data);
if (ret)
goto cleanup;
if (data[IFLA_MACSEC_OFFLOAD]) {
offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]);
if (macsec->offload != offload) {
macsec_offload_state_change = true;
ret = macsec_update_offload(dev, offload);
if (ret)
goto cleanup;
}
}
/* If h/w offloading is available, propagate to the device */
if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.secy = &macsec->secy;
ret = macsec_offload(ops->mdo_upd_secy, &ctx);
if (ret)
goto cleanup;
}
return 0;
cleanup:
memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
memcpy(&macsec->secy, &secy, sizeof(secy));
return ret;
}
static void macsec_del_dev(struct macsec_dev *macsec)
{
int i;
while (macsec->secy.rx_sc) {
struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
free_rx_sc(rx_sc);
}
for (i = 0; i < MACSEC_NUM_AN; i++) {
struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
if (sa) {
RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
clear_tx_sa(sa);
}
}
}
static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (ops) {
ctx.secy = &macsec->secy;
macsec_offload(ops->mdo_del_secy, &ctx);
}
}
unregister_netdevice_queue(dev, head);
list_del_rcu(&macsec->secys);
macsec_del_dev(macsec);
netdev_upper_dev_unlink(real_dev, dev);
macsec_generation++;
}
static void macsec_dellink(struct net_device *dev, struct list_head *head)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
macsec_common_dellink(dev, head);
if (list_empty(&rxd->secys)) {
netdev_rx_handler_unregister(real_dev);
kfree(rxd);
}
}
static int register_macsec_dev(struct net_device *real_dev,
struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
if (!rxd) {
int err;
rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
if (!rxd)
return -ENOMEM;
INIT_LIST_HEAD(&rxd->secys);
err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
rxd);
if (err < 0) {
kfree(rxd);
return err;
}
}
list_add_tail_rcu(&macsec->secys, &rxd->secys);
return 0;
}
static bool sci_exists(struct net_device *dev, sci_t sci)
{
struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
struct macsec_dev *macsec;
list_for_each_entry(macsec, &rxd->secys, secys) {
if (macsec->secy.sci == sci)
return true;
}
return false;
}
static sci_t dev_to_sci(struct net_device *dev, __be16 port)
{
return make_sci(dev->dev_addr, port);
}
static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct macsec_secy *secy = &macsec->secy;
macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
if (!macsec->stats)
return -ENOMEM;
secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
if (!secy->tx_sc.stats)
return -ENOMEM;
secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
if (!secy->tx_sc.md_dst)
/* macsec and secy percpu stats will be freed when unregistering
* net_device in macsec_free_netdev()
*/
return -ENOMEM;
if (sci == MACSEC_UNDEF_SCI)
sci = dev_to_sci(dev, MACSEC_PORT_ES);
secy->netdev = dev;
secy->operational = true;
secy->key_len = DEFAULT_SAK_LEN;
secy->icv_len = icv_len;
secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
secy->protect_frames = true;
secy->replay_protect = false;
secy->xpn = DEFAULT_XPN;
secy->sci = sci;
secy->tx_sc.md_dst->u.macsec_info.sci = sci;
secy->tx_sc.active = true;
secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
secy->tx_sc.end_station = false;
secy->tx_sc.scb = false;
return 0;
}
static struct lock_class_key macsec_netdev_addr_lock_key;
static int macsec_newlink(struct net *net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct macsec_dev *macsec = macsec_priv(dev);
rx_handler_func_t *rx_handler;
u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
struct net_device *real_dev;
int err, mtu;
sci_t sci;
if (!tb[IFLA_LINK])
return -EINVAL;
real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
if (!real_dev)
return -ENODEV;
if (real_dev->type != ARPHRD_ETHER)
return -EINVAL;
dev->priv_flags |= IFF_MACSEC;
macsec->real_dev = real_dev;
if (data && data[IFLA_MACSEC_OFFLOAD])
macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
else
/* MACsec offloading is off by default */
macsec->offload = MACSEC_OFFLOAD_OFF;
/* Check if the offloading mode is supported by the underlying layers */
if (macsec->offload != MACSEC_OFFLOAD_OFF &&
!macsec_check_offload(macsec->offload, macsec))
return -EOPNOTSUPP;
/* send_sci must be set to true when transmit sci explicitly is set */
if ((data && data[IFLA_MACSEC_SCI]) &&
(data && data[IFLA_MACSEC_INC_SCI])) {
u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
if (!send_sci)
return -EINVAL;
}
if (data && data[IFLA_MACSEC_ICV_LEN])
icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
if (mtu < 0)
dev->mtu = 0;
else
dev->mtu = mtu;
rx_handler = rtnl_dereference(real_dev->rx_handler);
if (rx_handler && rx_handler != macsec_handle_frame)
return -EBUSY;
err = register_netdevice(dev);
if (err < 0)
return err;
netdev_lockdep_set_classes(dev);
lockdep_set_class(&dev->addr_list_lock,
&macsec_netdev_addr_lock_key);
err = netdev_upper_dev_link(real_dev, dev, extack);
if (err < 0)
goto unregister;
/* need to be already registered so that ->init has run and
* the MAC addr is set
*/
if (data && data[IFLA_MACSEC_SCI])
sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
else if (data && data[IFLA_MACSEC_PORT])
sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
else
sci = dev_to_sci(dev, MACSEC_PORT_ES);
if (rx_handler && sci_exists(real_dev, sci)) {
err = -EBUSY;
goto unlink;
}
err = macsec_add_dev(dev, sci, icv_len);
if (err)
goto unlink;
if (data) {
err = macsec_changelink_common(dev, data);
if (err)
goto del_dev;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.secy = &macsec->secy;
err = macsec_offload(ops->mdo_add_secy, &ctx);
if (err)
goto del_dev;
macsec->insert_tx_tag =
macsec_needs_tx_tag(macsec, ops);
}
}
err = register_macsec_dev(real_dev, dev);
if (err < 0)
goto del_dev;
netif_stacked_transfer_operstate(real_dev, dev);
linkwatch_fire_event(dev);
macsec_generation++;
return 0;
del_dev:
macsec_del_dev(macsec);
unlink:
netdev_upper_dev_unlink(real_dev, dev);
unregister:
unregister_netdevice(dev);
return err;
}
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 = MACSEC_DEFAULT_ICV_LEN;
int flag;
bool es, scb, sci;
if (!data)
return 0;
if (data[IFLA_MACSEC_CIPHER_SUITE])
csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
if (data[IFLA_MACSEC_ICV_LEN]) {
icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
char dummy_key[DEFAULT_SAK_LEN] = { 0 };
struct crypto_aead *dummy_tfm;
dummy_tfm = macsec_alloc_tfm(dummy_key,
DEFAULT_SAK_LEN,
icv_len);
if (IS_ERR(dummy_tfm))
return PTR_ERR(dummy_tfm);
crypto_free_aead(dummy_tfm);
}
}
switch (csid) {
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)
return -EINVAL;
break;
default:
return -EINVAL;
}
if (data[IFLA_MACSEC_ENCODING_SA]) {
if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
return -EINVAL;
}
for (flag = IFLA_MACSEC_ENCODING_SA + 1;
flag < IFLA_MACSEC_VALIDATION;
flag++) {
if (data[flag]) {
if (nla_get_u8(data[flag]) > 1)
return -EINVAL;
}
}
es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
if ((sci && (scb || es)) || (scb && es))
return -EINVAL;
if (data[IFLA_MACSEC_VALIDATION] &&
nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
return -EINVAL;
if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
!data[IFLA_MACSEC_WINDOW])
return -EINVAL;
return 0;
}
static struct net *macsec_get_link_net(const struct net_device *dev)
{
return dev_net(macsec_priv(dev)->real_dev);
}
struct net_device *macsec_get_real_dev(const struct net_device *dev)
{
return macsec_priv(dev)->real_dev;
}
EXPORT_SYMBOL_GPL(macsec_get_real_dev);
bool macsec_netdev_is_offloaded(struct net_device *dev)
{
return macsec_is_offloaded(macsec_priv(dev));
}
EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded);
static size_t macsec_get_size(const struct net_device *dev)
{
return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
nla_total_size(1) + /* IFLA_MACSEC_ES */
nla_total_size(1) + /* IFLA_MACSEC_SCB */
nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */
0;
}
static int macsec_fill_info(struct sk_buff *skb,
const struct net_device *dev)
{
struct macsec_tx_sc *tx_sc;
struct macsec_dev *macsec;
struct macsec_secy *secy;
u64 csid;
macsec = macsec_priv(dev);
secy = &macsec->secy;
tx_sc = &secy->tx_sc;
switch (secy->key_len) {
case MACSEC_GCM_AES_128_SAK_LEN:
csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
break;
case MACSEC_GCM_AES_256_SAK_LEN:
csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
break;
default:
goto nla_put_failure;
}
if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
IFLA_MACSEC_PAD) ||
nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
csid, IFLA_MACSEC_PAD) ||
nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) ||
0)
goto nla_put_failure;
if (secy->replay_protect) {
if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
goto nla_put_failure;
}
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static struct rtnl_link_ops macsec_link_ops __read_mostly = {
.kind = "macsec",
.priv_size = sizeof(struct macsec_dev),
.maxtype = IFLA_MACSEC_MAX,
.policy = macsec_rtnl_policy,
.setup = macsec_setup,
.validate = macsec_validate_attr,
.newlink = macsec_newlink,
.changelink = macsec_changelink,
.dellink = macsec_dellink,
.get_size = macsec_get_size,
.fill_info = macsec_fill_info,
.get_link_net = macsec_get_link_net,
};
static bool is_macsec_master(struct net_device *dev)
{
return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
}
static int macsec_notify(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
LIST_HEAD(head);
if (!is_macsec_master(real_dev))
return NOTIFY_DONE;
switch (event) {
case NETDEV_DOWN:
case NETDEV_UP:
case NETDEV_CHANGE: {
struct macsec_dev *m, *n;
struct macsec_rxh_data *rxd;
rxd = macsec_data_rtnl(real_dev);
list_for_each_entry_safe(m, n, &rxd->secys, secys) {
struct net_device *dev = m->secy.netdev;
netif_stacked_transfer_operstate(real_dev, dev);
}
break;
}
case NETDEV_UNREGISTER: {
struct macsec_dev *m, *n;
struct macsec_rxh_data *rxd;
rxd = macsec_data_rtnl(real_dev);
list_for_each_entry_safe(m, n, &rxd->secys, secys) {
macsec_common_dellink(m->secy.netdev, &head);
}
netdev_rx_handler_unregister(real_dev);
kfree(rxd);
unregister_netdevice_many(&head);
break;
}
case NETDEV_CHANGEMTU: {
struct macsec_dev *m;
struct macsec_rxh_data *rxd;
rxd = macsec_data_rtnl(real_dev);
list_for_each_entry(m, &rxd->secys, secys) {
struct net_device *dev = m->secy.netdev;
unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
macsec_extra_len(true));
if (dev->mtu > mtu)
dev_set_mtu(dev, mtu);
}
}
}
return NOTIFY_OK;
}
static struct notifier_block macsec_notifier = {
.notifier_call = macsec_notify,
};
static int __init macsec_init(void)
{
int err;
pr_info("MACsec IEEE 802.1AE\n");
err = register_netdevice_notifier(&macsec_notifier);
if (err)
return err;
err = rtnl_link_register(&macsec_link_ops);
if (err)
goto notifier;
err = genl_register_family(&macsec_fam);
if (err)
goto rtnl;
return 0;
rtnl:
rtnl_link_unregister(&macsec_link_ops);
notifier:
unregister_netdevice_notifier(&macsec_notifier);
return err;
}
static void __exit macsec_exit(void)
{
genl_unregister_family(&macsec_fam);
rtnl_link_unregister(&macsec_link_ops);
unregister_netdevice_notifier(&macsec_notifier);
rcu_barrier();
}
module_init(macsec_init);
module_exit(macsec_exit);
MODULE_ALIAS_RTNL_LINK("macsec");
MODULE_ALIAS_GENL_FAMILY("macsec");
MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
MODULE_LICENSE("GPL v2");
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