// 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 <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))
  
  struct gcm_iv {
  	union {
  		u8 secure_channel_id[8];
  		sci_t sci;
  	};
  	__be32 pn;
  };

  struct macsec_dev_stats {
  	__u64 OutPktsUntagged;
  	__u64 InPktsUntagged;
  	__u64 OutPktsTooLong;
  	__u64 InPktsNoTag;
  	__u64 InPktsBadTag;
  	__u64 InPktsUnknownSCI;
  	__u64 InPktsNoSCI;
  	__u64 InPktsOverrun;
  };

  #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
   * @stats: MACsec device stats
   * @secys: linked list of SecY's on the underlying device

   * @offload: status of offloading on the MACsec device

   */
  struct macsec_dev {
  	struct macsec_secy secy;
  	struct net_device *real_dev;
  	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 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_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_SEND_SCI true
  #define DEFAULT_ENCRYPT false
  #define DEFAULT_ENCODING_SA 0

  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(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_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;
  
  	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;
  	}
  
  	return macsec->real_dev->phydev->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-2006 9.12 */
  static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
  {
  	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 (figure 10-5) */
  	if (!h->packet_number)
  		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(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
  ");
  	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 u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
  {
  	u32 pn;
  
  	spin_lock_bh(&tx_sa->lock);
  	pn = tx_sa->next_pn;
  
  	tx_sa->next_pn++;

  	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 void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
  			    struct macsec_tx_sa *tx_sa)
  {
  	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 += skb->len;
  		txsc_stats->stats.OutPktsEncrypted++;
  		this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
  	} else {
  		txsc_stats->stats.OutOctetsProtected += skb->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);
  		stats->tx_packets++;
  		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_encrypt_finish(skb, dev);
  	macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
  	len = skb->len;
  	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;

  	u32 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 == 0) {
  		macsec_txsa_put(tx_sa);
  		kfree_skb(skb);
  		return ERR_PTR(-ENOLINK);
  	}

  	macsec_fill_sectag(hh, secy, pn, 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);
  	}

  	macsec_fill_iv(iv, secy->sci, pn);

  	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;
  	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 >= secy->replay_window)
  		lowest_pn = rx_sa->next_pn - secy->replay_window;
  
  	/* Now perform replay protection check again
  	 * (see IEEE 802.1AE-2006 figure 10-5)
  	 */
  	if (secy->replay_protect && 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);
  		return false;
  	}
  
  	if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
  		u64_stats_update_begin(&rxsc_stats->syncp);
  		if (hdr->tci_an & MACSEC_TCI_E)
  			rxsc_stats->stats.InOctetsDecrypted += skb->len;
  		else
  			rxsc_stats->stats.InOctetsValidated += skb->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);
  			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);
  
  		if (pn >= rx_sa->next_pn)
  			rx_sa->next_pn = 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);
  	stats->rx_packets++;
  	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));
  	macsec_reset_skb(skb, macsec->secy.netdev);
  
  	len = skb->len;

  	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;
  	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;
  	macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));

  	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 macsec_rxh_data *rxd;
  	struct macsec_dev *macsec;
  
  	rcu_read_lock();
  	rxd = macsec_data_rcu(skb->dev);
  
  	/* 10.6 If the management control validateFrames is not
  	 * Strict, frames without a SecTAG are received, counted, and
  	 * delivered to the Controlled Port
  	 */
  	list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
  		struct sk_buff *nskb;

  		struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);

  		if (!macsec_is_offloaded(macsec) &&
  		    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);
  			continue;
  		}
  
  		/* deliver on this port */
  		nskb = skb_clone(skb, GFP_ATOMIC);
  		if (!nskb)
  			break;
  
  		nskb->dev = macsec->secy.netdev;

  		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);

  		}

  
  		if (netif_running(macsec->secy.netdev) &&
  		    macsec_is_offloaded(macsec)) {
  			ret = RX_HANDLER_EXACT;
  			goto out;
  		}

  	}

  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;
  	sci_t sci;
  	u32 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)) {
  		u64_stats_update_begin(&secy_stats->syncp);
  		secy_stats->stats.InPktsBadTag++;
  		u64_stats_update_end(&secy_stats->syncp);
  		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
  		 */
  		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);
  			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);
  		goto deliver;
  	}
  
  	/* First, PN check to avoid decrypting obviously wrong packets */
  	pn = ntohl(hdr->packet_number);
  	if (secy->replay_protect) {
  		bool late;
  
  		spin_lock(&rx_sa->lock);
  		late = rx_sa->next_pn >= secy->replay_window &&
  		       pn < (rx_sa->next_pn - secy->replay_window);
  		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);
  			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, pn))
  		goto drop;
  
  deliver:
  	macsec_finalize_skb(skb, secy->icv_len,
  			    macsec_extra_len(macsec_skb_cb(skb)->has_sci));
  	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, skb->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);
  			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;

  	tfm = crypto_alloc_aead("gcm(aes)", 0, 0);

  
  	if (IS_ERR(tfm))
  		return tfm;

  
  	ret = crypto_aead_setkey(tfm, key, key_len);

  	if (ret < 0)
  		goto fail;

  
  	ret = crypto_aead_setauthsize(tfm, icv_len);

  	if (ret < 0)
  		goto fail;

  
  	return tfm;

  fail:
  	crypto_free_aead(tfm);
  	return ERR_PTR(ret);

  }
  
  static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
  		      int icv_len)
  {
  	rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
  	if (!rx_sa->stats)

  		return -ENOMEM;

  
  	rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);

  	if (IS_ERR(rx_sa->key.tfm)) {

  		free_percpu(rx_sa->stats);

  		return PTR_ERR(rx_sa->key.tfm);

  	}
  
  	rx_sa->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->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 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 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] = { .type = NLA_U32 },

  	[MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
  				   .len = MACSEC_KEYID_LEN, },

  	[MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,

  				 .len = MACSEC_MAX_KEY_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)
  ", 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_u32(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;
  	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
  ",
  			  nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_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_u32(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;
  		memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
  		       MACSEC_KEYID_LEN);
  
  		err = macsec_offload(ops->mdo_add_rxsa, &ctx);
  		if (err)
  			goto cleanup;
  	}
  
  	nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);

  	rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
  
  	rtnl_unlock();
  
  	return 0;

  
  cleanup:
  	kfree(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];

  	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);
  	}
  
  	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;
  
  		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_u32(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;
  	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
  ",
  			  nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_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_u32(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;
  		memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
  		       MACSEC_KEYID_LEN);
  
  		err = macsec_offload(ops->mdo_add_txsa, &ctx);
  		if (err)
  			goto cleanup;
  	}
  
  	nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);

  	rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
  
  	rtnl_unlock();
  
  	return 0;

  
  cleanup:
  	secy->operational = was_operational;
  	kfree(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;
  
  		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;
  		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;
  
  		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])
  		return false;
  
  	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
  		return false;
  
  	if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(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;
  	u32 prev_pn = 0;
  	int ret = 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]) {
  		spin_lock_bh(&tx_sa->lock);

  		prev_pn = tx_sa->next_pn;

  		tx_sa->next_pn = nla_get_u32(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;
  
  		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 = 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;
  	u32 prev_pn = 0;
  	int ret = 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]) {
  		spin_lock_bh(&rx_sa->lock);

  		prev_pn = rx_sa->next_pn;

  		rx_sa->next_pn = nla_get_u32(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;
  
  		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 = 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;
  
  		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, *loop_dev;
  	const struct macsec_ops *ops;
  	struct macsec_context ctx;
  	struct macsec_dev *macsec;
  	struct net *loop_net;
  	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);
  
  	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;
  
  	if (offload == MACSEC_OFFLOAD_OFF)
  		goto skip_limitation;
  
  	/* Check the physical interface isn't offloading another interface
  	 * first.
  	 */
  	for_each_net(loop_net) {
  		for_each_netdev(loop_net, loop_dev) {
  			struct macsec_dev *priv;
  
  			if (!netif_is_macsec(loop_dev))
  				continue;
  
  			priv = macsec_priv(loop_dev);
  
  			if (priv->real_dev == macsec->real_dev &&
  			    priv->offload != MACSEC_OFFLOAD_OFF)
  				return -EBUSY;
  		}
  	}
  
  skip_limitation:
  	/* 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;
  
  	rtnl_unlock();
  	return 0;
  
  rollback:
  	macsec->offload = prev_offload;
  
  	rtnl_unlock();
  	return ret;
  }

  static int copy_tx_sa_stats(struct sk_buff *skb,

  			    struct macsec_tx_sa_stats __percpu *pstats)

  {
  	struct macsec_tx_sa_stats sum = {0, };
  	int cpu;
  
  	for_each_possible_cpu(cpu) {
  		const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
  
  		sum.OutPktsProtected += stats->OutPktsProtected;
  		sum.OutPktsEncrypted += stats->OutPktsEncrypted;
  	}
  
  	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 noinline_for_stack int
  copy_rx_sa_stats(struct sk_buff *skb,
  		 struct macsec_rx_sa_stats __percpu *pstats)

  {
  	struct macsec_rx_sa_stats sum = {0, };
  	int cpu;
  
  	for_each_possible_cpu(cpu) {
  		const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
  
  		sum.InPktsOK         += stats->InPktsOK;
  		sum.InPktsInvalid    += stats->InPktsInvalid;
  		sum.InPktsNotValid   += stats->InPktsNotValid;
  		sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
  		sum.InPktsUnusedSA   += stats->InPktsUnusedSA;
  	}
  
  	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 noinline_for_stack int
  copy_rx_sc_stats(struct sk_buff *skb, struct pcpu_rx_sc_stats __percpu *pstats)

  {
  	struct macsec_rx_sc_stats sum = {0, };
  	int cpu;
  
  	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(pstats, 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;
  	}

  	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 noinline_for_stack int
  copy_tx_sc_stats(struct sk_buff *skb, struct pcpu_tx_sc_stats __percpu *pstats)

  {
  	struct macsec_tx_sc_stats sum = {0, };
  	int cpu;
  
  	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(pstats, 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;
  	}

  	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 noinline_for_stack int
  copy_secy_stats(struct sk_buff *skb, struct pcpu_secy_stats __percpu *pstats)

  {
  	struct macsec_dev_stats sum = {0, };
  	int cpu;
  
  	for_each_possible_cpu(cpu) {
  		const struct pcpu_secy_stats *stats;
  		struct macsec_dev_stats tmp;
  		unsigned int start;
  
  		stats = per_cpu_ptr(pstats, 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;
  	}

  	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 = MACSEC_DEFAULT_CIPHER_ID;

  		break;
  	case MACSEC_GCM_AES_256_SAK_LEN:
  		csid = 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_dev *macsec = netdev_priv(dev);

  	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;
  	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;
  	if (copy_secy_stats(skb, macsec_priv(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;
  
  		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;
  		}
  
  		if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
  		    nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||

  		    nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||

  		    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;
  		}

  		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;
  		}
  		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);
  
  		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;
  		}
  		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;
  
  			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;
  			}
  			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 (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
  			    nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||

  			    nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||

  			    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_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,
  	.ops		= macsec_genl_ops,
  	.n_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;
  	}
  
  	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);
  	len = skb->len;
  	ret = dev_queue_xmit(skb);
  	count_tx(dev, ret, len);
  	return ret;
  }
  
  #define MACSEC_FEATURES \
  	(NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)

  static int macsec_dev_init(struct net_device *dev)
  {
  	struct macsec_dev *macsec = macsec_priv(dev);
  	struct net_device *real_dev = macsec->real_dev;

  	int err;

  
  	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;
  	}

  	dev->features = real_dev->features & 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);
  
  	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;

  	features &= (real_dev->features & MACSEC_FEATURES) |
  		    NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
  	features |= NETIF_F_LLTX;

  
  	return features;
  }
  
  static int macsec_dev_open(struct net_device *dev)
  {
  	struct macsec_dev *macsec = macsec_priv(dev);
  	struct net_device *real_dev = macsec->real_dev;
  	int err;

  	err = dev_uc_add(real_dev, dev->dev_addr);
  	if (err < 0)
  		return err;
  
  	if (dev->flags & IFF_ALLMULTI) {
  		err = dev_set_allmulti(real_dev, 1);
  		if (err < 0)
  			goto del_unicast;
  	}
  
  	if (dev->flags & IFF_PROMISC) {
  		err = dev_set_promiscuity(real_dev, 1);
  		if (err < 0)
  			goto clear_allmulti;
  	}

  	/* If h/w offloading is available, propagate to the device */
  	if (macsec_is_offloaded(macsec)) {
  		const struct macsec_ops *ops;
  		struct macsec_context ctx;
  
  		ops = macsec_get_ops(netdev_priv(dev), &ctx);
  		if (!ops) {
  			err = -EOPNOTSUPP;
  			goto clear_allmulti;
  		}
  
  		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)
  			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:
  	ether_addr_copy(dev->dev_addr, addr->sa_data);
  	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)

  {
  	int cpu;
  
  	if (!dev->tstats)

  		return;

  
  	for_each_possible_cpu(cpu) {
  		struct pcpu_sw_netstats *stats;
  		struct pcpu_sw_netstats tmp;
  		int start;
  
  		stats = per_cpu_ptr(dev->tstats, cpu);
  		do {
  			start = u64_stats_fetch_begin_irq(&stats->syncp);
  			tmp.rx_packets = stats->rx_packets;
  			tmp.rx_bytes   = stats->rx_bytes;
  			tmp.tx_packets = stats->tx_packets;
  			tmp.tx_bytes   = stats->tx_bytes;
  		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
  
  		s->rx_packets += tmp.rx_packets;
  		s->rx_bytes   += tmp.rx_bytes;
  		s->tx_packets += tmp.tx_packets;
  		s->tx_bytes   += tmp.tx_bytes;
  	}
  
  	s->rx_dropped = dev->stats.rx_dropped;
  	s->tx_dropped = dev->stats.tx_dropped;

  }
  
  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_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);

  }
  
  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_WINDOW])
  		secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
  
  	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;
  			break;
  		case MACSEC_CIPHER_ID_GCM_AES_256:
  			secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
  			break;
  		default:
  			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_sa 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)
  		return ret;
  
  	/* 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;

  
  	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);

  	/* 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);
  		}
  	}

  	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->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 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);
  	struct net_device *real_dev;
  	int err;
  	sci_t sci;
  	u8 icv_len = DEFAULT_ICV_LEN;
  	rx_handler_func_t *rx_handler;
  
  	if (!tb[IFLA_LINK])
  		return -EINVAL;
  	real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
  	if (!real_dev)
  		return -ENODEV;
  
  	dev->priv_flags |= IFF_MACSEC;
  
  	macsec->real_dev = real_dev;

  	/* MACsec offloading is off by default */
  	macsec->offload = MACSEC_OFFLOAD_OFF;

  	if (data && data[IFLA_MACSEC_ICV_LEN])
  		icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
  	dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
  
  	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;

  	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;
  	}

  
  	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_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 = MACSEC_DEFAULT_CIPHER_ID;

  		break;
  	case MACSEC_GCM_AES_256_SAK_LEN:
  		csid = 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
  ");
  	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");