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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // 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 <linux/phy.h>
 #include <linux/byteorder/generic.h>
 #include <linux/if_arp.h>
 
 #include <uapi/linux/if_macsec.h>
 
 #define MACSEC_SCI_LEN 8
 
 /* SecTAG length = macsec_eth_header without the optional SCI */
 #define MACSEC_TAG_LEN 6
 
 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;
 
 #define MACSEC_TCI_VERSION 0x80
 #define MACSEC_TCI_ES      0x40 /* end station */
 #define MACSEC_TCI_SC      0x20 /* SCI present */
 #define MACSEC_TCI_SCB     0x10 /* epon */
 #define MACSEC_TCI_E       0x08 /* encryption */
 #define MACSEC_TCI_C       0x04 /* changed text */
 #define MACSEC_AN_MASK     0x03 /* association number */
 #define MACSEC_TCI_CONFID  (MACSEC_TCI_E | MACSEC_TCI_C)
 
 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
 #define MIN_NON_SHORT_LEN 48
 
 #define GCM_AES_IV_LEN 12
 #define DEFAULT_ICV_LEN 16
 
 #define for_each_rxsc(secy, sc)             \
     for (sc = rcu_dereference_bh(secy->rx_sc);  \
          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
  */
 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;
 };
 
 /**
  * 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_ES (htons(0x0001))
 #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 bool send_sci(const struct macsec_secy *secy)
 {
     const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
 
     return tx_sc->send_sci ||
         (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
 }
 
 static sci_t make_sci(const u8 *addr, __be16 port)
 {
     sci_t sci;
 
     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 != 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)) {
         struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
 
         u64_stats_update_begin(&stats->syncp);
         u64_stats_inc(&stats->tx_packets);
         u64_stats_add(&stats->tx_bytes, len);
         u64_stats_update_end(&stats->syncp);
     }
 }
 
 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
 {
     struct sk_buff *skb = base->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 = 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);
         secy->netdev->stats.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);
             secy->netdev->stats.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)
 {
     struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
 
     u64_stats_update_begin(&stats->syncp);
     u64_stats_inc(&stats->rx_packets);
     u64_stats_add(&stats->rx_bytes, len);
     u64_stats_update_end(&stats->syncp);
 }
 
 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
 {
     struct sk_buff *skb = base->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 macsec_rxh_data *rxd;
     struct macsec_dev *macsec;
 
     rcu_read_lock();
     rxd = macsec_data_rcu(skb->dev);
 
     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)) {
             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;
                 if (ether_addr_equal_64bits(hdr->h_dest,
                                 ndev->broadcast))
                     nskb->pkt_type = PACKET_BROADCAST;
                 else
                     nskb->pkt_type = PACKET_MULTICAST;
 
                 __netif_rx(nskb);
             }
             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);
             macsec->secy.netdev->stats.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);
         secy->netdev->stats.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);
             secy->netdev->stats.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);
             macsec->secy.netdev->stats.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
         macsec->secy.netdev->stats.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, 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);
             macsec->secy.netdev->stats.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 {
             macsec->secy.netdev->stats.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;
 
     /* Pick a sync gcm(aes) cipher to ensure order is preserved. */
     tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
 
     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)
 {
     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 = true;
     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);
 
     /* Phase I: prepare. The drive should fail here if there are going to be
      * issues in the commit phase.
      */
     ctx->prepare = true;
     ret = (*func)(ctx);
     if (ret)
         goto phy_unlock;
 
     /* Phase II: commit. This step cannot fail. */
     ctx->prepare = false;
     ret = (*func)(ctx);
     /* This should never happen: commit is not allowed to fail */
     if (unlikely(ret))
         WARN(1, "MACsec offloading commit failed (%d)\n", ret);
 
 phy_unlock:
     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 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);
         if (err)
             goto cleanup;
     }
 
     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);
     }
 
     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 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();
     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]);
 
     rx_sc = create_rx_sc(dev, sci);
     if (IS_ERR(rx_sc)) {
         rtnl_unlock();
         return PTR_ERR(rx_sc);
     }
 
     was_active = rx_sc->active;
     if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
         rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
 
     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:
     rx_sc->active = was_active;
     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 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);
         if (err)
             goto cleanup;
     }
 
     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);
     }
 
     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.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.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->n_rx_sc > 0)
         return true;
 
     for (i = 0; i < MACSEC_NUM_AN; i++)
         if (tx_sc->sa[i])
             return true;
 
     return false;
 }
 
 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
 {
     struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
     enum macsec_offload offload, prev_offload;
     int (*func)(struct macsec_context *ctx);
     struct nlattr **attrs = info->attrs;
     struct net_device *dev;
     const struct macsec_ops *ops;
     struct macsec_context ctx;
     struct macsec_dev *macsec;
     int ret;
 
     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;
 
     dev = get_dev_from_nl(genl_info_net(info), attrs);
     if (IS_ERR(dev))
         return PTR_ERR(dev);
     macsec = macsec_priv(dev);
 
     if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
         return -EINVAL;
 
     offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
     if (macsec->offload == offload)
         return 0;
 
     /* 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;
 
     rtnl_lock();
 
     prev_offload = macsec->offload;
     macsec->offload = offload;
 
     /* Check if the device already has rules configured: we do not support
      * rules migration.
      */
     if (macsec_is_configured(macsec)) {
         ret = -EBUSY;
         goto rollback;
     }
 
     ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
                    macsec, &ctx);
     if (!ops) {
         ret = -EOPNOTSUPP;
         goto rollback;
     }
 
     if (prev_offload == MACSEC_OFFLOAD_OFF)
         func = ops->mdo_add_secy;
     else
         func = ops->mdo_del_secy;
 
     ctx.secy = &macsec->secy;
     ret = macsec_offload(func, &ctx);
     if (ret)
         goto rollback;
 
     /* Force features update, since they are different for SW MACSec and
      * HW offloading cases.
      */
     netdev_update_features(dev);
 
     rtnl_unlock();
     return 0;
 
 rollback:
     macsec->offload = prev_offload;
 
     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_irq(&stats->syncp);
             memcpy(&tmp, &stats->stats, sizeof(tmp));
         } while (u64_stats_fetch_retry_irq(&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_irq(&stats->syncp);
             memcpy(&tmp, &stats->stats, sizeof(tmp));
         } while (u64_stats_fetch_retry_irq(&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_irq(&stats->syncp);
             memcpy(&tmp, &stats->stats, sizeof(tmp));
         } while (u64_stats_fetch_retry_irq(&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),
 };
 
 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))) {
         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.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.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 SW_MACSEC_FEATURES \
     (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
 
 /* If h/w offloading is enabled, use real device features save for
  *   VLAN_FEATURES - they require additional ops
  *   HW_MACSEC - no reason to report it
  */
 #define REAL_DEV_FEATURES(dev) \
     ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC))
 
 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;
 
     dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
     if (!dev->tstats)
         return -ENOMEM;
 
     err = gro_cells_init(&macsec->gro_cells, dev);
     if (err) {
         free_percpu(dev->tstats);
         return err;
     }
 
     if (macsec_is_offloaded(macsec)) {
         dev->features = REAL_DEV_FEATURES(real_dev);
     } else {
         dev->features = real_dev->features & SW_MACSEC_FEATURES;
         dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
     }
 
     dev->needed_headroom = real_dev->needed_headroom +
                    MACSEC_NEEDED_HEADROOM;
     dev->needed_tailroom = real_dev->needed_tailroom +
                    MACSEC_NEEDED_TAILROOM;
 
     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);
     free_percpu(dev->tstats);
 }
 
 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;
 
     if (macsec_is_offloaded(macsec))
         return REAL_DEV_FEATURES(real_dev);
 
     features &= (real_dev->features & SW_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;
     int err;
 
     if (!is_valid_ether_addr(addr->sa_data))
         return -EADDRNOTAVAIL;
 
     if (!(dev->flags & IFF_UP))
         goto out;
 
     err = dev_uc_add(real_dev, addr->sa_data);
     if (err < 0)
         return err;
 
     dev_uc_del(real_dev, dev->dev_addr);
 
 out:
     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) {
             ctx.secy = &macsec->secy;
             macsec_offload(ops->mdo_upd_secy, &ctx);
         }
     }
 
     return 0;
 }
 
 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;
 
     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.rx_dropped;
     s->tx_dropped = dev->stats.tx_dropped;
     s->rx_errors = dev->stats.rx_errors;
 }
 
 static int macsec_get_iflink(const struct net_device *dev)
 {
     return 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 },
 };
 
 static void macsec_free_netdev(struct net_device *dev)
 {
     struct macsec_dev *macsec = macsec_priv(dev);
 
     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);
     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 h/w offloading is available, propagate to the device */
     if (macsec_is_offloaded(macsec)) {
         const struct macsec_ops *ops;
         struct macsec_context ctx;
         int ret;
 
         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) {
         free_percpu(macsec->stats);
         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.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 = 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;
         }
     }
 
     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 = 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 != 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);
 }
 
 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 */
         0;
 }
 
 static int macsec_fill_info(struct sk_buff *skb,
                 const struct net_device *dev)
 {
     struct macsec_secy *secy = &macsec_priv(dev)->secy;
     struct macsec_tx_sc *tx_sc = &secy->tx_sc;
     u64 csid;
 
     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) ||
         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");