// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * drivers/net/macsec.c - MACsec device
 *
 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
 */

#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/module.h>
#include <crypto/aead.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/refcount.h>
#include <net/genetlink.h>
#include <net/sock.h>
#include <net/gro_cells.h>
#include <net/macsec.h>
#include <net/dst_metadata.h>
#include <net/netdev_lock.h>
#include <linux/phy.h>
#include <linux/byteorder/generic.h>
#include <linux/if_arp.h>

#include <uapi/linux/if_macsec.h>

/* SecTAG length = macsec_eth_header without the optional SCI */
#define MACSEC_TAG_LEN 6

struct macsec_eth_header {
        struct ethhdr eth;
        /* SecTAG */
        u8  tci_an;
#if defined(__LITTLE_ENDIAN_BITFIELD)
        u8  short_length:6,
                  unused:2;
#elif defined(__BIG_ENDIAN_BITFIELD)
        u8        unused:2,
            short_length:6;
#else
#error  "Please fix <asm/byteorder.h>"
#endif
        __be32 packet_number;
        u8 secure_channel_id[8]; /* optional */
} __packed;

/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
#define MIN_NON_SHORT_LEN 48

#define GCM_AES_IV_LEN 12

#define for_each_rxsc(secy, sc)                         \
        for (sc = rcu_dereference_bh(secy->rx_sc);      \
             sc;                                        \
             sc = rcu_dereference_bh(sc->next))
#define for_each_rxsc_rtnl(secy, sc)                    \
        for (sc = rtnl_dereference(secy->rx_sc);        \
             sc;                                        \
             sc = rtnl_dereference(sc->next))

#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))

struct gcm_iv_xpn {
        union {
                u8 short_secure_channel_id[4];
                ssci_t ssci;
        };
        __be64 pn;
} __packed;

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

#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT

struct pcpu_secy_stats {
        struct macsec_dev_stats stats;
        struct u64_stats_sync syncp;
};

/**
 * struct macsec_dev - private data
 * @secy: SecY config
 * @real_dev: pointer to underlying netdevice
 * @dev_tracker: refcount tracker for @real_dev reference
 * @stats: MACsec device stats
 * @secys: linked list of SecY's on the underlying device
 * @gro_cells: pointer to the Generic Receive Offload cell
 * @offload: status of offloading on the MACsec device
 * @insert_tx_tag: when offloading, device requires to insert an
 *      additional tag
 */
struct macsec_dev {
        struct macsec_secy secy;
        struct net_device *real_dev;
        netdevice_tracker dev_tracker;
        struct pcpu_secy_stats __percpu *stats;
        struct list_head secys;
        struct gro_cells gro_cells;
        enum macsec_offload offload;
        bool insert_tx_tag;
};

/**
 * struct macsec_rxh_data - rx_handler private argument
 * @secys: linked list of SecY's on this underlying device
 */
struct macsec_rxh_data {
        struct list_head secys;
};

static struct macsec_dev *macsec_priv(const struct net_device *dev)
{
        return (struct macsec_dev *)netdev_priv(dev);
}

static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
{
        return rcu_dereference_bh(dev->rx_handler_data);
}

static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
{
        return rtnl_dereference(dev->rx_handler_data);
}

struct macsec_cb {
        struct aead_request *req;
        union {
                struct macsec_tx_sa *tx_sa;
                struct macsec_rx_sa *rx_sa;
        };
        u8 assoc_num;
        bool valid;
        bool has_sci;
};

static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
{
        struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);

        if (!sa || !sa->active)
                return NULL;

        if (!refcount_inc_not_zero(&sa->refcnt))
                return NULL;

        return sa;
}

static void free_rx_sc_rcu(struct rcu_head *head)
{
        struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);

        free_percpu(rx_sc->stats);
        kfree(rx_sc);
}

static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
{
        return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
}

static void macsec_rxsc_put(struct macsec_rx_sc *sc)
{
        if (refcount_dec_and_test(&sc->refcnt))
                call_rcu(&sc->rcu_head, free_rx_sc_rcu);
}

static void free_rxsa(struct rcu_head *head)
{
        struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);

        crypto_free_aead(sa->key.tfm);
        free_percpu(sa->stats);
        kfree(sa);
}

static void macsec_rxsa_put(struct macsec_rx_sa *sa)
{
        if (refcount_dec_and_test(&sa->refcnt))
                call_rcu(&sa->rcu, free_rxsa);
}

static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
{
        struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);

        if (!sa || !sa->active)
                return NULL;

        if (!refcount_inc_not_zero(&sa->refcnt))
                return NULL;

        return sa;
}

static void free_txsa(struct rcu_head *head)
{
        struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);

        crypto_free_aead(sa->key.tfm);
        free_percpu(sa->stats);
        kfree(sa);
}

static void macsec_txsa_put(struct macsec_tx_sa *sa)
{
        if (refcount_dec_and_test(&sa->refcnt))
                call_rcu(&sa->rcu, free_txsa);
}

static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
{
        BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
        return (struct macsec_cb *)skb->cb;
}

#define MACSEC_PORT_SCB (0x0000)
#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)

#define MACSEC_GCM_AES_128_SAK_LEN 16
#define MACSEC_GCM_AES_256_SAK_LEN 32

#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
#define DEFAULT_XPN false
#define DEFAULT_SEND_SCI true
#define DEFAULT_ENCRYPT false
#define DEFAULT_ENCODING_SA 0
#define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))

static sci_t make_sci(const u8 *addr, __be16 port)
{
        sci_t sci;

        memcpy(&sci, addr, ETH_ALEN);
        memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));

        return sci;
}

static sci_t macsec_active_sci(struct macsec_secy *secy)
{
        struct macsec_rx_sc *rx_sc = rcu_dereference_bh(secy->rx_sc);

        /* Case single RX SC */
        if (rx_sc && !rcu_dereference_bh(rx_sc->next))
                return (rx_sc->active) ? rx_sc->sci : 0;
        /* Case no RX SC or multiple */
        else
                return 0;
}

static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present,
                              struct macsec_rxh_data *rxd)
{
        struct macsec_dev *macsec;
        sci_t sci = 0;

        /* SC = 1 */
        if (sci_present) {
                memcpy(&sci, hdr->secure_channel_id,
                       sizeof(hdr->secure_channel_id));
        /* SC = 0; ES = 0 */
        } else if ((!(hdr->tci_an & (MACSEC_TCI_ES | MACSEC_TCI_SC))) &&
                   (list_is_singular(&rxd->secys))) {
                /* Only one SECY should exist on this scenario */
                macsec = list_first_or_null_rcu(&rxd->secys, struct macsec_dev,
                                                secys);
                if (macsec)
                        return macsec_active_sci(&macsec->secy);
        } else {
                sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
        }

        return sci;
}

static unsigned int macsec_sectag_len(bool sci_present)
{
        return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
}

static unsigned int macsec_hdr_len(bool sci_present)
{
        return macsec_sectag_len(sci_present) + ETH_HLEN;
}

static unsigned int macsec_extra_len(bool sci_present)
{
        return macsec_sectag_len(sci_present) + sizeof(__be16);
}

/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
static void macsec_fill_sectag(struct macsec_eth_header *h,
                               const struct macsec_secy *secy, u32 pn,
                               bool sci_present)
{
        const struct macsec_tx_sc *tx_sc = &secy->tx_sc;

        memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
        h->eth.h_proto = htons(ETH_P_MACSEC);

        if (sci_present) {
                h->tci_an |= MACSEC_TCI_SC;
                memcpy(&h->secure_channel_id, &secy->sci,
                       sizeof(h->secure_channel_id));
        } else {
                if (tx_sc->end_station)
                        h->tci_an |= MACSEC_TCI_ES;
                if (tx_sc->scb)
                        h->tci_an |= MACSEC_TCI_SCB;
        }

        h->packet_number = htonl(pn);

        /* with GCM, C/E clear for !encrypt, both set for encrypt */
        if (tx_sc->encrypt)
                h->tci_an |= MACSEC_TCI_CONFID;
        else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN)
                h->tci_an |= MACSEC_TCI_C;

        h->tci_an |= tx_sc->encoding_sa;
}

static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
{
        if (data_len < MIN_NON_SHORT_LEN)
                h->short_length = data_len;
}

/* Checks if a MACsec interface is being offloaded to an hardware engine */
static bool macsec_is_offloaded(struct macsec_dev *macsec)
{
        if (macsec->offload == MACSEC_OFFLOAD_MAC ||
            macsec->offload == MACSEC_OFFLOAD_PHY)
                return true;

        return false;
}

/* Checks if underlying layers implement MACsec offloading functions. */
static bool macsec_check_offload(enum macsec_offload offload,
                                 struct macsec_dev *macsec)
{
        if (!macsec || !macsec->real_dev)
                return false;

        if (offload == MACSEC_OFFLOAD_PHY)
                return macsec->real_dev->phydev &&
                       macsec->real_dev->phydev->macsec_ops;
        else if (offload == MACSEC_OFFLOAD_MAC)
                return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
                       macsec->real_dev->macsec_ops;

        return false;
}

static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
                                                 struct macsec_dev *macsec,
                                                 struct macsec_context *ctx)
{
        if (ctx) {
                memset(ctx, 0, sizeof(*ctx));
                ctx->offload = offload;

                if (offload == MACSEC_OFFLOAD_PHY)
                        ctx->phydev = macsec->real_dev->phydev;
                else if (offload == MACSEC_OFFLOAD_MAC)
                        ctx->netdev = macsec->real_dev;
        }

        if (offload == MACSEC_OFFLOAD_PHY)
                return macsec->real_dev->phydev->macsec_ops;
        else
                return macsec->real_dev->macsec_ops;
}

/* Returns a pointer to the MACsec ops struct if any and updates the MACsec
 * context device reference if provided.
 */
static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
                                               struct macsec_context *ctx)
{
        if (!macsec_check_offload(macsec->offload, macsec))
                return NULL;

        return __macsec_get_ops(macsec->offload, macsec, ctx);
}

/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
{
        struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
        int len = skb->len - 2 * ETH_ALEN;
        int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;

        /* a) It comprises at least 17 octets */
        if (skb->len <= 16)
                return false;

        /* b) MACsec EtherType: already checked */

        /* c) V bit is clear */
        if (h->tci_an & MACSEC_TCI_VERSION)
                return false;

        /* d) ES or SCB => !SC */
        if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
            (h->tci_an & MACSEC_TCI_SC))
                return false;

        /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
        if (h->unused)
                return false;

        /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
        if (!h->packet_number && !xpn)
                return false;

        /* length check, f) g) h) i) */
        if (h->short_length)
                return len == extra_len + h->short_length;
        return len >= extra_len + MIN_NON_SHORT_LEN;
}

#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN

static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
                               salt_t salt)
{
        struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;

        gcm_iv->ssci = ssci ^ salt.ssci;
        gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
}

static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
{
        struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;

        gcm_iv->sci = sci;
        gcm_iv->pn = htonl(pn);
}

static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
{
        return (struct macsec_eth_header *)skb_mac_header(skb);
}

static void __macsec_pn_wrapped(struct macsec_secy *secy,
                                struct macsec_tx_sa *tx_sa)
{
        pr_debug("PN wrapped, transitioning to !oper\n");
        tx_sa->active = false;
        if (secy->protect_frames)
                secy->operational = false;
}

void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
{
        spin_lock_bh(&tx_sa->lock);
        __macsec_pn_wrapped(secy, tx_sa);
        spin_unlock_bh(&tx_sa->lock);
}
EXPORT_SYMBOL_GPL(macsec_pn_wrapped);

static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
                            struct macsec_secy *secy)
{
        pn_t pn;

        spin_lock_bh(&tx_sa->lock);

        pn = tx_sa->next_pn_halves;
        if (secy->xpn)
                tx_sa->next_pn++;
        else
                tx_sa->next_pn_halves.lower++;

        if (tx_sa->next_pn == 0)
                __macsec_pn_wrapped(secy, tx_sa);
        spin_unlock_bh(&tx_sa->lock);

        return pn;
}

static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
{
        struct macsec_dev *macsec = netdev_priv(dev);

        skb->dev = macsec->real_dev;
        skb_reset_mac_header(skb);
        skb->protocol = eth_hdr(skb)->h_proto;
}

static unsigned int macsec_msdu_len(struct sk_buff *skb)
{
        struct macsec_dev *macsec = macsec_priv(skb->dev);
        struct macsec_secy *secy = &macsec->secy;
        bool sci_present = macsec_skb_cb(skb)->has_sci;

        return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;
}

static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
                            struct macsec_tx_sa *tx_sa)
{
        unsigned int msdu_len = macsec_msdu_len(skb);
        struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);

        u64_stats_update_begin(&txsc_stats->syncp);
        if (tx_sc->encrypt) {
                txsc_stats->stats.OutOctetsEncrypted += msdu_len;
                txsc_stats->stats.OutPktsEncrypted++;
                this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
        } else {
                txsc_stats->stats.OutOctetsProtected += msdu_len;
                txsc_stats->stats.OutPktsProtected++;
                this_cpu_inc(tx_sa->stats->OutPktsProtected);
        }
        u64_stats_update_end(&txsc_stats->syncp);
}

static void count_tx(struct net_device *dev, int ret, int len)
{
        if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN))
                dev_sw_netstats_tx_add(dev, 1, len);
}

static void macsec_encrypt_done(void *data, int err)
{
        struct sk_buff *skb = data;
        struct net_device *dev = skb->dev;
        struct macsec_dev *macsec = macsec_priv(dev);
        struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
        int len, ret;

        aead_request_free(macsec_skb_cb(skb)->req);

        rcu_read_lock_bh();
        macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
        /* packet is encrypted/protected so tx_bytes must be calculated */
        len = macsec_msdu_len(skb) + 2 * ETH_ALEN;
        macsec_encrypt_finish(skb, dev);
        ret = dev_queue_xmit(skb);
        count_tx(dev, ret, len);
        rcu_read_unlock_bh();

        macsec_txsa_put(sa);
        dev_put(dev);
}

static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
                                             unsigned char **iv,
                                             struct scatterlist **sg,
                                             int num_frags)
{
        size_t size, iv_offset, sg_offset;
        struct aead_request *req;
        void *tmp;

        size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
        iv_offset = size;
        size += GCM_AES_IV_LEN;

        size = ALIGN(size, __alignof__(struct scatterlist));
        sg_offset = size;
        size += sizeof(struct scatterlist) * num_frags;

        tmp = kmalloc(size, GFP_ATOMIC);
        if (!tmp)
                return NULL;

        *iv = (unsigned char *)(tmp + iv_offset);
        *sg = (struct scatterlist *)(tmp + sg_offset);
        req = tmp;

        aead_request_set_tfm(req, tfm);

        return req;
}

static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
                                      struct net_device *dev)
{
        int ret;
        struct scatterlist *sg;
        struct sk_buff *trailer;
        unsigned char *iv;
        struct ethhdr *eth;
        struct macsec_eth_header *hh;
        size_t unprotected_len;
        struct aead_request *req;
        struct macsec_secy *secy;
        struct macsec_tx_sc *tx_sc;
        struct macsec_tx_sa *tx_sa;
        struct macsec_dev *macsec = macsec_priv(dev);
        bool sci_present;
        pn_t pn;

        secy = &macsec->secy;
        tx_sc = &secy->tx_sc;

        /* 10.5.1 TX SA assignment */
        tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
        if (!tx_sa) {
                secy->operational = false;
                kfree_skb(skb);
                return ERR_PTR(-EINVAL);
        }

        if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
                     skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
                struct sk_buff *nskb = skb_copy_expand(skb,
                                                       MACSEC_NEEDED_HEADROOM,
                                                       MACSEC_NEEDED_TAILROOM,
                                                       GFP_ATOMIC);
                if (likely(nskb)) {
                        consume_skb(skb);
                        skb = nskb;
                } else {
                        macsec_txsa_put(tx_sa);
                        kfree_skb(skb);
                        return ERR_PTR(-ENOMEM);
                }
        } else {
                skb = skb_unshare(skb, GFP_ATOMIC);
                if (!skb) {
                        macsec_txsa_put(tx_sa);
                        return ERR_PTR(-ENOMEM);
                }
        }

        unprotected_len = skb->len;
        eth = eth_hdr(skb);
        sci_present = macsec_send_sci(secy);
        hh = skb_push(skb, macsec_extra_len(sci_present));
        memmove(hh, eth, 2 * ETH_ALEN);

        pn = tx_sa_update_pn(tx_sa, secy);
        if (pn.full64 == 0) {
                macsec_txsa_put(tx_sa);
                kfree_skb(skb);
                return ERR_PTR(-ENOLINK);
        }
        macsec_fill_sectag(hh, secy, pn.lower, sci_present);
        macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);

        skb_put(skb, secy->icv_len);

        if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
                struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);

                u64_stats_update_begin(&secy_stats->syncp);
                secy_stats->stats.OutPktsTooLong++;
                u64_stats_update_end(&secy_stats->syncp);

                macsec_txsa_put(tx_sa);
                kfree_skb(skb);
                return ERR_PTR(-EINVAL);
        }

        ret = skb_cow_data(skb, 0, &trailer);
        if (unlikely(ret < 0)) {
                macsec_txsa_put(tx_sa);
                kfree_skb(skb);
                return ERR_PTR(ret);
        }

        req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
        if (!req) {
                macsec_txsa_put(tx_sa);
                kfree_skb(skb);
                return ERR_PTR(-ENOMEM);
        }

        if (secy->xpn)
                macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
        else
                macsec_fill_iv(iv, secy->sci, pn.lower);

        sg_init_table(sg, ret);
        ret = skb_to_sgvec(skb, sg, 0, skb->len);
        if (unlikely(ret < 0)) {
                aead_request_free(req);
                macsec_txsa_put(tx_sa);
                kfree_skb(skb);
                return ERR_PTR(ret);
        }

        if (tx_sc->encrypt) {
                int len = skb->len - macsec_hdr_len(sci_present) -
                          secy->icv_len;
                aead_request_set_crypt(req, sg, sg, len, iv);
                aead_request_set_ad(req, macsec_hdr_len(sci_present));
        } else {
                aead_request_set_crypt(req, sg, sg, 0, iv);
                aead_request_set_ad(req, skb->len - secy->icv_len);
        }

        macsec_skb_cb(skb)->req = req;
        macsec_skb_cb(skb)->tx_sa = tx_sa;
        macsec_skb_cb(skb)->has_sci = sci_present;
        aead_request_set_callback(req, 0, macsec_encrypt_done, skb);

        dev_hold(skb->dev);
        ret = crypto_aead_encrypt(req);
        if (ret == -EINPROGRESS) {
                return ERR_PTR(ret);
        } else if (ret != 0) {
                dev_put(skb->dev);
                kfree_skb(skb);
                aead_request_free(req);
                macsec_txsa_put(tx_sa);
                return ERR_PTR(-EINVAL);
        }

        dev_put(skb->dev);
        aead_request_free(req);
        macsec_txsa_put(tx_sa);

        return skb;
}

static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
{
        struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
        struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
        struct macsec_eth_header *hdr = macsec_ethhdr(skb);
        u32 lowest_pn = 0;

        spin_lock(&rx_sa->lock);
        if (rx_sa->next_pn_halves.lower >= secy->replay_window)
                lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;

        /* Now perform replay protection check again
         * (see IEEE 802.1AE-2006 figure 10-5)
         */
        if (secy->replay_protect && pn < lowest_pn &&
            (!secy->xpn || pn_same_half(pn, lowest_pn))) {
                spin_unlock(&rx_sa->lock);
                u64_stats_update_begin(&rxsc_stats->syncp);
                rxsc_stats->stats.InPktsLate++;
                u64_stats_update_end(&rxsc_stats->syncp);
                DEV_STATS_INC(secy->netdev, rx_dropped);
                return false;
        }

        if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
                unsigned int msdu_len = macsec_msdu_len(skb);
                u64_stats_update_begin(&rxsc_stats->syncp);
                if (hdr->tci_an & MACSEC_TCI_E)
                        rxsc_stats->stats.InOctetsDecrypted += msdu_len;
                else
                        rxsc_stats->stats.InOctetsValidated += msdu_len;
                u64_stats_update_end(&rxsc_stats->syncp);
        }

        if (!macsec_skb_cb(skb)->valid) {
                spin_unlock(&rx_sa->lock);

                /* 10.6.5 */
                if (hdr->tci_an & MACSEC_TCI_C ||
                    secy->validate_frames == MACSEC_VALIDATE_STRICT) {
                        u64_stats_update_begin(&rxsc_stats->syncp);
                        rxsc_stats->stats.InPktsNotValid++;
                        u64_stats_update_end(&rxsc_stats->syncp);
                        this_cpu_inc(rx_sa->stats->InPktsNotValid);
                        DEV_STATS_INC(secy->netdev, rx_errors);
                        return false;
                }

                u64_stats_update_begin(&rxsc_stats->syncp);
                if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
                        rxsc_stats->stats.InPktsInvalid++;
                        this_cpu_inc(rx_sa->stats->InPktsInvalid);
                } else if (pn < lowest_pn) {
                        rxsc_stats->stats.InPktsDelayed++;
                } else {
                        rxsc_stats->stats.InPktsUnchecked++;
                }
                u64_stats_update_end(&rxsc_stats->syncp);
        } else {
                u64_stats_update_begin(&rxsc_stats->syncp);
                if (pn < lowest_pn) {
                        rxsc_stats->stats.InPktsDelayed++;
                } else {
                        rxsc_stats->stats.InPktsOK++;
                        this_cpu_inc(rx_sa->stats->InPktsOK);
                }
                u64_stats_update_end(&rxsc_stats->syncp);

                // Instead of "pn >=" - to support pn overflow in xpn
                if (pn + 1 > rx_sa->next_pn_halves.lower) {
                        rx_sa->next_pn_halves.lower = pn + 1;
                } else if (secy->xpn &&
                           !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
                        rx_sa->next_pn_halves.upper++;
                        rx_sa->next_pn_halves.lower = pn + 1;
                }

                spin_unlock(&rx_sa->lock);
        }

        return true;
}

static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
{
        skb->pkt_type = PACKET_HOST;
        skb->protocol = eth_type_trans(skb, dev);

        skb_reset_network_header(skb);
        if (!skb_transport_header_was_set(skb))
                skb_reset_transport_header(skb);
        skb_reset_mac_len(skb);
}

static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
{
        skb->ip_summed = CHECKSUM_NONE;
        memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
        skb_pull(skb, hdr_len);
        pskb_trim_unique(skb, skb->len - icv_len);
}

static void count_rx(struct net_device *dev, int len)
{
        dev_sw_netstats_rx_add(dev, len);
}

static void macsec_decrypt_done(void *data, int err)
{
        struct sk_buff *skb = data;
        struct net_device *dev = skb->dev;
        struct macsec_dev *macsec = macsec_priv(dev);
        struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
        struct macsec_rx_sc *rx_sc = rx_sa->sc;
        int len;
        u32 pn;

        aead_request_free(macsec_skb_cb(skb)->req);

        if (!err)
                macsec_skb_cb(skb)->valid = true;

        rcu_read_lock_bh();
        pn = ntohl(macsec_ethhdr(skb)->packet_number);
        if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
                rcu_read_unlock_bh();
                kfree_skb(skb);
                goto out;
        }

        macsec_finalize_skb(skb, macsec->secy.icv_len,
                            macsec_extra_len(macsec_skb_cb(skb)->has_sci));
        len = skb->len;
        macsec_reset_skb(skb, macsec->secy.netdev);

        if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
                count_rx(dev, len);

        rcu_read_unlock_bh();

out:
        macsec_rxsa_put(rx_sa);
        macsec_rxsc_put(rx_sc);
        dev_put(dev);
}

static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
                                      struct net_device *dev,
                                      struct macsec_rx_sa *rx_sa,
                                      sci_t sci,
                                      struct macsec_secy *secy)
{
        int ret;
        struct scatterlist *sg;
        struct sk_buff *trailer;
        unsigned char *iv;
        struct aead_request *req;
        struct macsec_eth_header *hdr;
        u32 hdr_pn;
        u16 icv_len = secy->icv_len;

        macsec_skb_cb(skb)->valid = false;
        skb = skb_share_check(skb, GFP_ATOMIC);
        if (!skb)
                return ERR_PTR(-ENOMEM);

        ret = skb_cow_data(skb, 0, &trailer);
        if (unlikely(ret < 0)) {
                kfree_skb(skb);
                return ERR_PTR(ret);
        }
        req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
        if (!req) {
                kfree_skb(skb);
                return ERR_PTR(-ENOMEM);
        }

        hdr = (struct macsec_eth_header *)skb->data;
        hdr_pn = ntohl(hdr->packet_number);

        if (secy->xpn) {
                pn_t recovered_pn = rx_sa->next_pn_halves;

                recovered_pn.lower = hdr_pn;
                if (hdr_pn < rx_sa->next_pn_halves.lower &&
                    !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
                        recovered_pn.upper++;

                macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
                                   rx_sa->key.salt);
        } else {
                macsec_fill_iv(iv, sci, hdr_pn);
        }

        sg_init_table(sg, ret);
        ret = skb_to_sgvec(skb, sg, 0, skb->len);
        if (unlikely(ret < 0)) {
                aead_request_free(req);
                kfree_skb(skb);
                return ERR_PTR(ret);
        }

        if (hdr->tci_an & MACSEC_TCI_E) {
                /* confidentiality: ethernet + macsec header
                 * authenticated, encrypted payload
                 */
                int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);

                aead_request_set_crypt(req, sg, sg, len, iv);
                aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
                skb = skb_unshare(skb, GFP_ATOMIC);
                if (!skb) {
                        aead_request_free(req);
                        return ERR_PTR(-ENOMEM);
                }
        } else {
                /* integrity only: all headers + data authenticated */
                aead_request_set_crypt(req, sg, sg, icv_len, iv);
                aead_request_set_ad(req, skb->len - icv_len);
        }

        macsec_skb_cb(skb)->req = req;
        skb->dev = dev;
        aead_request_set_callback(req, 0, macsec_decrypt_done, skb);

        dev_hold(dev);
        ret = crypto_aead_decrypt(req);
        if (ret == -EINPROGRESS) {
                return ERR_PTR(ret);
        } else if (ret != 0) {
                /* decryption/authentication failed
                 * 10.6 if validateFrames is disabled, deliver anyway
                 */
                if (ret != -EBADMSG) {
                        kfree_skb(skb);
                        skb = ERR_PTR(ret);
                }
        } else {
                macsec_skb_cb(skb)->valid = true;
        }
        dev_put(dev);

        aead_request_free(req);

        return skb;
}

static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
{
        struct macsec_rx_sc *rx_sc;

        for_each_rxsc(secy, rx_sc) {
                if (rx_sc->sci == sci)
                        return rx_sc;
        }

        return NULL;
}

static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
{
        struct macsec_rx_sc *rx_sc;

        for_each_rxsc_rtnl(secy, rx_sc) {
                if (rx_sc->sci == sci)
                        return rx_sc;
        }

        return NULL;
}

static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
{
        /* Deliver to the uncontrolled port by default */
        enum rx_handler_result ret = RX_HANDLER_PASS;
        struct ethhdr *hdr = eth_hdr(skb);
        struct metadata_dst *md_dst;
        struct macsec_rxh_data *rxd;
        struct macsec_dev *macsec;
        bool is_macsec_md_dst;

        rcu_read_lock();
        rxd = macsec_data_rcu(skb->dev);
        md_dst = skb_metadata_dst(skb);
        is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC;

        list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
                struct sk_buff *nskb;
                struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
                struct net_device *ndev = macsec->secy.netdev;

                /* If h/w offloading is enabled, HW decodes frames and strips
                 * the SecTAG, so we have to deduce which port to deliver to.
                 */
                if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
                        const struct macsec_ops *ops;

                        ops = macsec_get_ops(macsec, NULL);

                        if (ops->rx_uses_md_dst && !is_macsec_md_dst)
                                continue;

                        if (is_macsec_md_dst) {
                                struct macsec_rx_sc *rx_sc;

                                /* All drivers that implement MACsec offload
                                 * support using skb metadata destinations must
                                 * indicate that they do so.
                                 */
                                DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst);
                                rx_sc = find_rx_sc(&macsec->secy,
                                                   md_dst->u.macsec_info.sci);
                                if (!rx_sc)
                                        continue;
                                /* device indicated macsec offload occurred */
                                skb->dev = ndev;
                                skb->pkt_type = PACKET_HOST;
                                eth_skb_pkt_type(skb, ndev);
                                ret = RX_HANDLER_ANOTHER;
                                goto out;
                        }

                        /* This datapath is insecure because it is unable to
                         * enforce isolation of broadcast/multicast traffic and
                         * unicast traffic with promiscuous mode on the macsec
                         * netdev. Since the core stack has no mechanism to
                         * check that the hardware did indeed receive MACsec
                         * traffic, it is possible that the response handling
                         * done by the MACsec port was to a plaintext packet.
                         * This violates the MACsec protocol standard.
                         */
                        if (ether_addr_equal_64bits(hdr->h_dest,
                                                    ndev->dev_addr)) {
                                /* exact match, divert skb to this port */
                                skb->dev = ndev;
                                skb->pkt_type = PACKET_HOST;
                                ret = RX_HANDLER_ANOTHER;
                                goto out;
                        } else if (is_multicast_ether_addr_64bits(
                                           hdr->h_dest)) {
                                /* multicast frame, deliver on this port too */
                                nskb = skb_clone(skb, GFP_ATOMIC);
                                if (!nskb)
                                        break;

                                nskb->dev = ndev;
                                eth_skb_pkt_type(nskb, ndev);

                                __netif_rx(nskb);
                        } else if (ndev->flags & IFF_PROMISC) {
                                skb->dev = ndev;
                                skb->pkt_type = PACKET_HOST;
                                ret = RX_HANDLER_ANOTHER;
                                goto out;
                        }

                        continue;
                }

                /* 10.6 If the management control validateFrames is not
                 * Strict, frames without a SecTAG are received, counted, and
                 * delivered to the Controlled Port
                 */
                if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
                        u64_stats_update_begin(&secy_stats->syncp);
                        secy_stats->stats.InPktsNoTag++;
                        u64_stats_update_end(&secy_stats->syncp);
                        DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
                        continue;
                }

                /* deliver on this port */
                nskb = skb_clone(skb, GFP_ATOMIC);
                if (!nskb)
                        break;

                nskb->dev = ndev;

                if (__netif_rx(nskb) == NET_RX_SUCCESS) {
                        u64_stats_update_begin(&secy_stats->syncp);
                        secy_stats->stats.InPktsUntagged++;
                        u64_stats_update_end(&secy_stats->syncp);
                }
        }

out:
        rcu_read_unlock();
        return ret;
}

static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
{
        struct sk_buff *skb = *pskb;
        struct net_device *dev = skb->dev;
        struct macsec_eth_header *hdr;
        struct macsec_secy *secy = NULL;
        struct macsec_rx_sc *rx_sc;
        struct macsec_rx_sa *rx_sa;
        struct macsec_rxh_data *rxd;
        struct macsec_dev *macsec;
        unsigned int len;
        sci_t sci = 0;
        u32 hdr_pn;
        bool cbit;
        struct pcpu_rx_sc_stats *rxsc_stats;
        struct pcpu_secy_stats *secy_stats;
        bool pulled_sci;
        int ret;

        if (skb_headroom(skb) < ETH_HLEN)
                goto drop_direct;

        hdr = macsec_ethhdr(skb);
        if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
                return handle_not_macsec(skb);

        skb = skb_unshare(skb, GFP_ATOMIC);
        *pskb = skb;
        if (!skb)
                return RX_HANDLER_CONSUMED;

        pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
        if (!pulled_sci) {
                if (!pskb_may_pull(skb, macsec_extra_len(false)))
                        goto drop_direct;
        }

        hdr = macsec_ethhdr(skb);

        /* Frames with a SecTAG that has the TCI E bit set but the C
         * bit clear are discarded, as this reserved encoding is used
         * to identify frames with a SecTAG that are not to be
         * delivered to the Controlled Port.
         */
        if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
                return RX_HANDLER_PASS;

        /* now, pull the extra length */
        if (hdr->tci_an & MACSEC_TCI_SC) {
                if (!pulled_sci)
                        goto drop_direct;
        }

        /* ethernet header is part of crypto processing */
        skb_push(skb, ETH_HLEN);

        macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
        macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;

        rcu_read_lock();
        rxd = macsec_data_rcu(skb->dev);

        sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci, rxd);
        if (!sci)
                goto drop_nosc;

        list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
                struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);

                sc = sc ? macsec_rxsc_get(sc) : NULL;

                if (sc) {
                        secy = &macsec->secy;
                        rx_sc = sc;
                        break;
                }
        }

        if (!secy)
                goto nosci;

        dev = secy->netdev;
        macsec = macsec_priv(dev);
        secy_stats = this_cpu_ptr(macsec->stats);
        rxsc_stats = this_cpu_ptr(rx_sc->stats);

        if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
                u64_stats_update_begin(&secy_stats->syncp);
                secy_stats->stats.InPktsBadTag++;
                u64_stats_update_end(&secy_stats->syncp);
                DEV_STATS_INC(secy->netdev, rx_errors);
                goto drop_nosa;
        }

        rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
        if (!rx_sa) {
                /* 10.6.1 if the SA is not in use */

                /* If validateFrames is Strict or the C bit in the
                 * SecTAG is set, discard
                 */
                if (hdr->tci_an & MACSEC_TCI_C ||
                    secy->validate_frames == MACSEC_VALIDATE_STRICT) {
                        u64_stats_update_begin(&rxsc_stats->syncp);
                        rxsc_stats->stats.InPktsNotUsingSA++;
                        u64_stats_update_end(&rxsc_stats->syncp);
                        DEV_STATS_INC(secy->netdev, rx_errors);
                        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 */
        hdr_pn = ntohl(hdr->packet_number);
        if (secy->replay_protect) {
                bool late;

                spin_lock(&rx_sa->lock);
                late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
                       hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);

                if (secy->xpn)
                        late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
                spin_unlock(&rx_sa->lock);

                if (late) {
                        u64_stats_update_begin(&rxsc_stats->syncp);
                        rxsc_stats->stats.InPktsLate++;
                        u64_stats_update_end(&rxsc_stats->syncp);
                        DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
                        goto drop;
                }
        }

        macsec_skb_cb(skb)->rx_sa = rx_sa;

        /* Disabled && !changed text => skip validation */
        if (hdr->tci_an & MACSEC_TCI_C ||
            secy->validate_frames != MACSEC_VALIDATE_DISABLED)
                skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);

        if (IS_ERR(skb)) {
                /* the decrypt callback needs the reference */
                if (PTR_ERR(skb) != -EINPROGRESS) {
                        macsec_rxsa_put(rx_sa);
                        macsec_rxsc_put(rx_sc);
                }
                rcu_read_unlock();
                *pskb = NULL;
                return RX_HANDLER_CONSUMED;
        }

        if (!macsec_post_decrypt(skb, secy, hdr_pn))
                goto drop;

deliver:
        macsec_finalize_skb(skb, secy->icv_len,
                            macsec_extra_len(macsec_skb_cb(skb)->has_sci));
        len = skb->len;
        macsec_reset_skb(skb, secy->netdev);

        if (rx_sa)
                macsec_rxsa_put(rx_sa);
        macsec_rxsc_put(rx_sc);

        skb_orphan(skb);
        ret = gro_cells_receive(&macsec->gro_cells, skb);
        if (ret == NET_RX_SUCCESS)
                count_rx(dev, len);
        else
                DEV_STATS_INC(macsec->secy.netdev, rx_dropped);

        rcu_read_unlock();

        *pskb = NULL;
        return RX_HANDLER_CONSUMED;

drop:
        macsec_rxsa_put(rx_sa);
drop_nosa:
        macsec_rxsc_put(rx_sc);
drop_nosc:
        rcu_read_unlock();
drop_direct:
        kfree_skb(skb);
        *pskb = NULL;
        return RX_HANDLER_CONSUMED;

nosci:
        /* 10.6.1 if the SC is not found */
        cbit = !!(hdr->tci_an & MACSEC_TCI_C);
        if (!cbit)
                macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
                                    macsec_extra_len(macsec_skb_cb(skb)->has_sci));

        list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
                struct sk_buff *nskb;

                secy_stats = this_cpu_ptr(macsec->stats);

                /* If validateFrames is Strict or the C bit in the
                 * SecTAG is set, discard
                 */
                if (cbit ||
                    macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
                        u64_stats_update_begin(&secy_stats->syncp);
                        secy_stats->stats.InPktsNoSCI++;
                        u64_stats_update_end(&secy_stats->syncp);
                        DEV_STATS_INC(macsec->secy.netdev, rx_errors);
                        continue;
                }

                /* not strict, the frame (with the SecTAG and ICV
                 * removed) is delivered to the Controlled Port.
                 */
                nskb = skb_clone(skb, GFP_ATOMIC);
                if (!nskb)
                        break;

                macsec_reset_skb(nskb, macsec->secy.netdev);

                ret = __netif_rx(nskb);
                if (ret == NET_RX_SUCCESS) {
                        u64_stats_update_begin(&secy_stats->syncp);
                        secy_stats->stats.InPktsUnknownSCI++;
                        u64_stats_update_end(&secy_stats->syncp);
                } else {
                        DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
                }
        }

        rcu_read_unlock();
        *pskb = skb;
        return RX_HANDLER_PASS;
}

static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
{
        struct crypto_aead *tfm;
        int ret;

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

        if (IS_ERR(tfm))
                return tfm;

        ret = crypto_aead_setkey(tfm, key, key_len);
        if (ret < 0)
                goto fail;

        ret = crypto_aead_setauthsize(tfm, icv_len);
        if (ret < 0)
                goto fail;

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

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

        rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
        if (IS_ERR(rx_sa->key.tfm)) {
                free_percpu(rx_sa->stats);
                return PTR_ERR(rx_sa->key.tfm);
        }

        rx_sa->ssci = MACSEC_UNDEF_SSCI;
        rx_sa->active = false;
        rx_sa->next_pn = 1;
        refcount_set(&rx_sa->refcnt, 1);
        spin_lock_init(&rx_sa->lock);

        return 0;
}

static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
{
        rx_sa->active = false;

        macsec_rxsa_put(rx_sa);
}

static void free_rx_sc(struct macsec_rx_sc *rx_sc)
{
        int i;

        for (i = 0; i < MACSEC_NUM_AN; i++) {
                struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);

                RCU_INIT_POINTER(rx_sc->sa[i], NULL);
                if (sa)
                        clear_rx_sa(sa);
        }

        macsec_rxsc_put(rx_sc);
}

static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
{
        struct macsec_rx_sc *rx_sc, __rcu **rx_scp;

        for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
             rx_sc;
             rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
                if (rx_sc->sci == sci) {
                        if (rx_sc->active)
                                secy->n_rx_sc--;
                        rcu_assign_pointer(*rx_scp, rx_sc->next);
                        return rx_sc;
                }
        }

        return NULL;
}

static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
                                         bool active)
{
        struct macsec_rx_sc *rx_sc;
        struct macsec_dev *macsec;
        struct net_device *real_dev = macsec_priv(dev)->real_dev;
        struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
        struct macsec_secy *secy;

        list_for_each_entry(macsec, &rxd->secys, secys) {
                if (find_rx_sc_rtnl(&macsec->secy, sci))
                        return ERR_PTR(-EEXIST);
        }

        rx_sc = kzalloc_obj(*rx_sc);
        if (!rx_sc)
                return ERR_PTR(-ENOMEM);

        rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
        if (!rx_sc->stats) {
                kfree(rx_sc);
                return ERR_PTR(-ENOMEM);
        }

        rx_sc->sci = sci;
        rx_sc->active = active;
        refcount_set(&rx_sc->refcnt, 1);

        secy = &macsec_priv(dev)->secy;
        rcu_assign_pointer(rx_sc->next, secy->rx_sc);
        rcu_assign_pointer(secy->rx_sc, rx_sc);

        if (rx_sc->active)
                secy->n_rx_sc++;

        return rx_sc;
}

static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
                      int icv_len)
{
        tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
        if (!tx_sa->stats)
                return -ENOMEM;

        tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
        if (IS_ERR(tx_sa->key.tfm)) {
                free_percpu(tx_sa->stats);
                return PTR_ERR(tx_sa->key.tfm);
        }

        tx_sa->ssci = MACSEC_UNDEF_SSCI;
        tx_sa->active = false;
        refcount_set(&tx_sa->refcnt, 1);
        spin_lock_init(&tx_sa->lock);

        return 0;
}

static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
{
        tx_sa->active = false;

        macsec_txsa_put(tx_sa);
}

static struct genl_family macsec_fam;

static struct net_device *get_dev_from_nl(struct net *net,
                                          struct nlattr **attrs)
{
        int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
        struct net_device *dev;

        dev = __dev_get_by_index(net, ifindex);
        if (!dev)
                return ERR_PTR(-ENODEV);

        if (!netif_is_macsec(dev))
                return ERR_PTR(-ENODEV);

        return dev;
}

static enum macsec_offload nla_get_offload(const struct nlattr *nla)
{
        return (__force enum macsec_offload)nla_get_u8(nla);
}

static sci_t nla_get_sci(const struct nlattr *nla)
{
        return (__force sci_t)nla_get_u64(nla);
}

static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
                       int padattr)
{
        return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
}

static ssci_t nla_get_ssci(const struct nlattr *nla)
{
        return (__force ssci_t)nla_get_u32(nla);
}

static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
{
        return nla_put_u32(skb, attrtype, (__force u64)value);
}

static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
                                             struct nlattr **attrs,
                                             struct nlattr **tb_sa,
                                             struct net_device **devp,
                                             struct macsec_secy **secyp,
                                             struct macsec_tx_sc **scp,
                                             u8 *assoc_num)
{
        struct net_device *dev;
        struct macsec_secy *secy;
        struct macsec_tx_sc *tx_sc;
        struct macsec_tx_sa *tx_sa;

        if (!tb_sa[MACSEC_SA_ATTR_AN])
                return ERR_PTR(-EINVAL);

        *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);

        dev = get_dev_from_nl(net, attrs);
        if (IS_ERR(dev))
                return ERR_CAST(dev);

        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]);

        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] = NLA_POLICY_MAX(NLA_U8, 1),
};

static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
        [MACSEC_SA_ATTR_AN] = NLA_POLICY_MAX(NLA_U8, MACSEC_NUM_AN - 1),
        [MACSEC_SA_ATTR_ACTIVE] = NLA_POLICY_MAX(NLA_U8, 1),
        [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN(NLA_UINT, 1),
        [MACSEC_SA_ATTR_KEYID] = NLA_POLICY_EXACT_LEN(MACSEC_KEYID_LEN),
        [MACSEC_SA_ATTR_KEY] = NLA_POLICY_MAX_LEN(MACSEC_MAX_KEY_LEN),
        [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
        [MACSEC_SA_ATTR_SALT] = NLA_POLICY_EXACT_LEN(MACSEC_SALT_LEN),
};

static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
        [MACSEC_OFFLOAD_ATTR_TYPE] = NLA_POLICY_MAX(NLA_U8, MACSEC_OFFLOAD_MAX),
};

/* Offloads an operation to a device driver */
static int macsec_offload(int (* const func)(struct macsec_context *),
                          struct macsec_context *ctx)
{
        int ret;

        if (unlikely(!func))
                return 0;

        if (ctx->offload == MACSEC_OFFLOAD_PHY)
                mutex_lock(&ctx->phydev->lock);

        ret = (*func)(ctx);

        if (ctx->offload == MACSEC_OFFLOAD_PHY)
                mutex_unlock(&ctx->phydev->lock);

        return ret;
}

static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
{
        if (!attrs[MACSEC_ATTR_SA_CONFIG])
                return -EINVAL;

        if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
                return -EINVAL;

        return 0;
}

static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
{
        if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
                return -EINVAL;

        if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
                return -EINVAL;

        return 0;
}

static bool validate_add_rxsa(struct nlattr **attrs)
{
        if (!attrs[MACSEC_SA_ATTR_AN] ||
            !attrs[MACSEC_SA_ATTR_KEY] ||
            !attrs[MACSEC_SA_ATTR_KEYID])
                return false;

        return true;
}

static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
{
        struct net_device *dev;
        struct nlattr **attrs = info->attrs;
        struct macsec_secy *secy;
        struct macsec_rx_sc *rx_sc;
        struct macsec_rx_sa *rx_sa;
        unsigned char assoc_num;
        int pn_len;
        struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
        struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
        int err;

        if (!attrs[MACSEC_ATTR_IFINDEX])
                return -EINVAL;

        if (parse_sa_config(attrs, tb_sa))
                return -EINVAL;

        if (parse_rxsc_config(attrs, tb_rxsc))
                return -EINVAL;

        if (!validate_add_rxsa(tb_sa))
                return -EINVAL;

        rtnl_lock();
        rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
        if (IS_ERR(rx_sc)) {
                rtnl_unlock();
                return PTR_ERR(rx_sc);
        }

        assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);

        if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
                pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
                          nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
                rtnl_unlock();
                return -EINVAL;
        }

        pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
        if (tb_sa[MACSEC_SA_ATTR_PN] &&
            nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
                pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
                          nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
                rtnl_unlock();
                return -EINVAL;
        }

        if (secy->xpn) {
                if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
                        rtnl_unlock();
                        return -EINVAL;
                }
        }

        rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
        if (rx_sa) {
                rtnl_unlock();
                return -EBUSY;
        }

        rx_sa = kmalloc_obj(*rx_sa);
        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_uint(tb_sa[MACSEC_SA_ATTR_PN]);
                spin_unlock_bh(&rx_sa->lock);
        }

        if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
                rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);

        rx_sa->sc = rx_sc;

        if (secy->xpn) {
                rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
                nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
                           MACSEC_SALT_LEN);
        }

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(netdev_priv(dev))) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (!ops) {
                        err = -EOPNOTSUPP;
                        goto cleanup;
                }

                ctx.sa.assoc_num = assoc_num;
                ctx.sa.rx_sa = rx_sa;
                ctx.secy = secy;
                memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
                       secy->key_len);

                err = macsec_offload(ops->mdo_add_rxsa, &ctx);
                memzero_explicit(ctx.sa.key, secy->key_len);
                if (err)
                        goto cleanup;
        }

        nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
        rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);

        rtnl_unlock();

        return 0;

cleanup:
        macsec_rxsa_put(rx_sa);
        rtnl_unlock();
        return err;
}

static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
{
        struct net_device *dev;
        sci_t sci = MACSEC_UNDEF_SCI;
        struct nlattr **attrs = info->attrs;
        struct macsec_rx_sc *rx_sc;
        struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
        struct macsec_secy *secy;
        bool active = true;
        int ret;

        if (!attrs[MACSEC_ATTR_IFINDEX])
                return -EINVAL;

        if (parse_rxsc_config(attrs, tb_rxsc))
                return -EINVAL;

        if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
                return -EINVAL;

        rtnl_lock();
        dev = get_dev_from_nl(genl_info_net(info), attrs);
        if (IS_ERR(dev)) {
                rtnl_unlock();
                return PTR_ERR(dev);
        }

        secy = &macsec_priv(dev)->secy;
        sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);

        if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
                active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);

        rx_sc = create_rx_sc(dev, sci, active);
        if (IS_ERR(rx_sc)) {
                rtnl_unlock();
                return PTR_ERR(rx_sc);
        }

        if (macsec_is_offloaded(netdev_priv(dev))) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (!ops) {
                        ret = -EOPNOTSUPP;
                        goto cleanup;
                }

                ctx.rx_sc = rx_sc;
                ctx.secy = secy;

                ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
                if (ret)
                        goto cleanup;
        }

        rtnl_unlock();

        return 0;

cleanup:
        del_rx_sc(secy, sci);
        free_rx_sc(rx_sc);
        rtnl_unlock();
        return ret;
}

static bool validate_add_txsa(struct nlattr **attrs)
{
        if (!attrs[MACSEC_SA_ATTR_AN] ||
            !attrs[MACSEC_SA_ATTR_PN] ||
            !attrs[MACSEC_SA_ATTR_KEY] ||
            !attrs[MACSEC_SA_ATTR_KEYID])
                return false;

        return true;
}

static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
{
        struct net_device *dev;
        struct nlattr **attrs = info->attrs;
        struct macsec_secy *secy;
        struct macsec_tx_sc *tx_sc;
        struct macsec_tx_sa *tx_sa;
        unsigned char assoc_num;
        int pn_len;
        struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
        bool was_operational;
        int err;

        if (!attrs[MACSEC_ATTR_IFINDEX])
                return -EINVAL;

        if (parse_sa_config(attrs, tb_sa))
                return -EINVAL;

        if (!validate_add_txsa(tb_sa))
                return -EINVAL;

        rtnl_lock();
        dev = get_dev_from_nl(genl_info_net(info), attrs);
        if (IS_ERR(dev)) {
                rtnl_unlock();
                return PTR_ERR(dev);
        }

        secy = &macsec_priv(dev)->secy;
        tx_sc = &secy->tx_sc;

        assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);

        if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
                pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
                          nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
                rtnl_unlock();
                return -EINVAL;
        }

        pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
        if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
                pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
                          nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
                rtnl_unlock();
                return -EINVAL;
        }

        if (secy->xpn) {
                if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
                        rtnl_unlock();
                        return -EINVAL;
                }
        }

        tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
        if (tx_sa) {
                rtnl_unlock();
                return -EBUSY;
        }

        tx_sa = kmalloc_obj(*tx_sa);
        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_uint(tb_sa[MACSEC_SA_ATTR_PN]);
        spin_unlock_bh(&tx_sa->lock);

        if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
                tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);

        was_operational = secy->operational;
        if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
                secy->operational = true;

        if (secy->xpn) {
                tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
                nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
                           MACSEC_SALT_LEN);
        }

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(netdev_priv(dev))) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (!ops) {
                        err = -EOPNOTSUPP;
                        goto cleanup;
                }

                ctx.sa.assoc_num = assoc_num;
                ctx.sa.tx_sa = tx_sa;
                ctx.secy = secy;
                memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
                       secy->key_len);

                err = macsec_offload(ops->mdo_add_txsa, &ctx);
                memzero_explicit(ctx.sa.key, secy->key_len);
                if (err)
                        goto cleanup;
        }

        nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
        rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);

        rtnl_unlock();

        return 0;

cleanup:
        secy->operational = was_operational;
        macsec_txsa_put(tx_sa);
        rtnl_unlock();
        return err;
}

static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
{
        struct nlattr **attrs = info->attrs;
        struct net_device *dev;
        struct macsec_secy *secy;
        struct macsec_rx_sc *rx_sc;
        struct macsec_rx_sa *rx_sa;
        u8 assoc_num;
        struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
        struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
        int ret;

        if (!attrs[MACSEC_ATTR_IFINDEX])
                return -EINVAL;

        if (parse_sa_config(attrs, tb_sa))
                return -EINVAL;

        if (parse_rxsc_config(attrs, tb_rxsc))
                return -EINVAL;

        rtnl_lock();
        rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
                                 &dev, &secy, &rx_sc, &assoc_num);
        if (IS_ERR(rx_sa)) {
                rtnl_unlock();
                return PTR_ERR(rx_sa);
        }

        if (rx_sa->active) {
                rtnl_unlock();
                return -EBUSY;
        }

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(netdev_priv(dev))) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (!ops) {
                        ret = -EOPNOTSUPP;
                        goto cleanup;
                }

                ctx.sa.assoc_num = assoc_num;
                ctx.sa.rx_sa = rx_sa;
                ctx.secy = secy;

                ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
                if (ret)
                        goto cleanup;
        }

        RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
        clear_rx_sa(rx_sa);

        rtnl_unlock();

        return 0;

cleanup:
        rtnl_unlock();
        return ret;
}

static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
{
        struct nlattr **attrs = info->attrs;
        struct net_device *dev;
        struct macsec_secy *secy;
        struct macsec_rx_sc *rx_sc;
        sci_t sci;
        struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
        int ret;

        if (!attrs[MACSEC_ATTR_IFINDEX])
                return -EINVAL;

        if (parse_rxsc_config(attrs, tb_rxsc))
                return -EINVAL;

        if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
                return -EINVAL;

        rtnl_lock();
        dev = get_dev_from_nl(genl_info_net(info), info->attrs);
        if (IS_ERR(dev)) {
                rtnl_unlock();
                return PTR_ERR(dev);
        }

        secy = &macsec_priv(dev)->secy;
        sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);

        rx_sc = del_rx_sc(secy, sci);
        if (!rx_sc) {
                rtnl_unlock();
                return -ENODEV;
        }

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(netdev_priv(dev))) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (!ops) {
                        ret = -EOPNOTSUPP;
                        goto cleanup;
                }

                ctx.rx_sc = rx_sc;
                ctx.secy = secy;
                ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
                if (ret)
                        goto cleanup;
        }

        free_rx_sc(rx_sc);
        rtnl_unlock();

        return 0;

cleanup:
        rtnl_unlock();
        return ret;
}

static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
{
        struct nlattr **attrs = info->attrs;
        struct net_device *dev;
        struct macsec_secy *secy;
        struct macsec_tx_sc *tx_sc;
        struct macsec_tx_sa *tx_sa;
        u8 assoc_num;
        struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
        int ret;

        if (!attrs[MACSEC_ATTR_IFINDEX])
                return -EINVAL;

        if (parse_sa_config(attrs, tb_sa))
                return -EINVAL;

        rtnl_lock();
        tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
                                 &dev, &secy, &tx_sc, &assoc_num);
        if (IS_ERR(tx_sa)) {
                rtnl_unlock();
                return PTR_ERR(tx_sa);
        }

        if (tx_sa->active) {
                rtnl_unlock();
                return -EBUSY;
        }

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(netdev_priv(dev))) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (!ops) {
                        ret = -EOPNOTSUPP;
                        goto cleanup;
                }

                ctx.sa.assoc_num = assoc_num;
                ctx.sa.tx_sa = tx_sa;
                ctx.secy = secy;

                ret = macsec_offload(ops->mdo_del_txsa, &ctx);
                if (ret)
                        goto cleanup;
        }

        RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
        clear_tx_sa(tx_sa);

        rtnl_unlock();

        return 0;

cleanup:
        rtnl_unlock();
        return ret;
}

static bool validate_upd_sa(struct nlattr **attrs)
{
        if (!attrs[MACSEC_SA_ATTR_AN] ||
            attrs[MACSEC_SA_ATTR_KEY] ||
            attrs[MACSEC_SA_ATTR_KEYID] ||
            attrs[MACSEC_SA_ATTR_SSCI] ||
            attrs[MACSEC_SA_ATTR_SALT])
                return false;

        return true;
}

static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
{
        struct nlattr **attrs = info->attrs;
        struct net_device *dev;
        struct macsec_secy *secy;
        struct macsec_tx_sc *tx_sc;
        struct macsec_tx_sa *tx_sa;
        u8 assoc_num;
        struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
        bool was_operational, was_active;
        pn_t prev_pn;
        int ret = 0;

        prev_pn.full64 = 0;

        if (!attrs[MACSEC_ATTR_IFINDEX])
                return -EINVAL;

        if (parse_sa_config(attrs, tb_sa))
                return -EINVAL;

        if (!validate_upd_sa(tb_sa))
                return -EINVAL;

        rtnl_lock();
        tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
                                 &dev, &secy, &tx_sc, &assoc_num);
        if (IS_ERR(tx_sa)) {
                rtnl_unlock();
                return PTR_ERR(tx_sa);
        }

        if (tb_sa[MACSEC_SA_ATTR_PN]) {
                int pn_len;

                pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
                if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
                        pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
                                  nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
                        rtnl_unlock();
                        return -EINVAL;
                }

                spin_lock_bh(&tx_sa->lock);
                prev_pn = tx_sa->next_pn_halves;
                tx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]);
                spin_unlock_bh(&tx_sa->lock);
        }

        was_active = tx_sa->active;
        if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
                tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);

        was_operational = secy->operational;
        if (assoc_num == tx_sc->encoding_sa)
                secy->operational = tx_sa->active;

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(netdev_priv(dev))) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (!ops) {
                        ret = -EOPNOTSUPP;
                        goto cleanup;
                }

                ctx.sa.assoc_num = assoc_num;
                ctx.sa.tx_sa = tx_sa;
                ctx.sa.update_pn = !!prev_pn.full64;
                ctx.secy = secy;

                ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
                if (ret)
                        goto cleanup;
        }

        rtnl_unlock();

        return 0;

cleanup:
        if (tb_sa[MACSEC_SA_ATTR_PN]) {
                spin_lock_bh(&tx_sa->lock);
                tx_sa->next_pn_halves = prev_pn;
                spin_unlock_bh(&tx_sa->lock);
        }
        tx_sa->active = was_active;
        secy->operational = was_operational;
        rtnl_unlock();
        return ret;
}

static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
{
        struct nlattr **attrs = info->attrs;
        struct net_device *dev;
        struct macsec_secy *secy;
        struct macsec_rx_sc *rx_sc;
        struct macsec_rx_sa *rx_sa;
        u8 assoc_num;
        struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
        struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
        bool was_active;
        pn_t prev_pn;
        int ret = 0;

        prev_pn.full64 = 0;

        if (!attrs[MACSEC_ATTR_IFINDEX])
                return -EINVAL;

        if (parse_rxsc_config(attrs, tb_rxsc))
                return -EINVAL;

        if (parse_sa_config(attrs, tb_sa))
                return -EINVAL;

        if (!validate_upd_sa(tb_sa))
                return -EINVAL;

        rtnl_lock();
        rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
                                 &dev, &secy, &rx_sc, &assoc_num);
        if (IS_ERR(rx_sa)) {
                rtnl_unlock();
                return PTR_ERR(rx_sa);
        }

        if (tb_sa[MACSEC_SA_ATTR_PN]) {
                int pn_len;

                pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
                if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
                        pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
                                  nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
                        rtnl_unlock();
                        return -EINVAL;
                }

                spin_lock_bh(&rx_sa->lock);
                prev_pn = rx_sa->next_pn_halves;
                rx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]);
                spin_unlock_bh(&rx_sa->lock);
        }

        was_active = rx_sa->active;
        if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
                rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(netdev_priv(dev))) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (!ops) {
                        ret = -EOPNOTSUPP;
                        goto cleanup;
                }

                ctx.sa.assoc_num = assoc_num;
                ctx.sa.rx_sa = rx_sa;
                ctx.sa.update_pn = !!prev_pn.full64;
                ctx.secy = secy;

                ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
                if (ret)
                        goto cleanup;
        }

        rtnl_unlock();
        return 0;

cleanup:
        if (tb_sa[MACSEC_SA_ATTR_PN]) {
                spin_lock_bh(&rx_sa->lock);
                rx_sa->next_pn_halves = prev_pn;
                spin_unlock_bh(&rx_sa->lock);
        }
        rx_sa->active = was_active;
        rtnl_unlock();
        return ret;
}

static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
{
        struct nlattr **attrs = info->attrs;
        struct net_device *dev;
        struct macsec_secy *secy;
        struct macsec_rx_sc *rx_sc;
        struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
        unsigned int prev_n_rx_sc;
        bool was_active;
        int ret;

        if (!attrs[MACSEC_ATTR_IFINDEX])
                return -EINVAL;

        if (parse_rxsc_config(attrs, tb_rxsc))
                return -EINVAL;

        if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
                return -EINVAL;

        rtnl_lock();
        rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
        if (IS_ERR(rx_sc)) {
                rtnl_unlock();
                return PTR_ERR(rx_sc);
        }

        was_active = rx_sc->active;
        prev_n_rx_sc = secy->n_rx_sc;
        if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
                bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);

                if (rx_sc->active != new)
                        secy->n_rx_sc += new ? 1 : -1;

                rx_sc->active = new;
        }

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(netdev_priv(dev))) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (!ops) {
                        ret = -EOPNOTSUPP;
                        goto cleanup;
                }

                ctx.rx_sc = rx_sc;
                ctx.secy = secy;

                ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
                if (ret)
                        goto cleanup;
        }

        rtnl_unlock();

        return 0;

cleanup:
        secy->n_rx_sc = prev_n_rx_sc;
        rx_sc->active = was_active;
        rtnl_unlock();
        return ret;
}

static bool macsec_is_configured(struct macsec_dev *macsec)
{
        struct macsec_secy *secy = &macsec->secy;
        struct macsec_tx_sc *tx_sc = &secy->tx_sc;
        int i;

        if (secy->rx_sc)
                return true;

        for (i = 0; i < MACSEC_NUM_AN; i++)
                if (tx_sc->sa[i])
                        return true;

        return false;
}

static bool macsec_needs_tx_tag(struct macsec_dev *macsec,
                                const struct macsec_ops *ops)
{
        return macsec->offload == MACSEC_OFFLOAD_PHY &&
                ops->mdo_insert_tx_tag;
}

static void macsec_set_head_tail_room(struct net_device *dev)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        struct net_device *real_dev = macsec->real_dev;
        int needed_headroom, needed_tailroom;
        const struct macsec_ops *ops;

        ops = macsec_get_ops(macsec, NULL);
        if (ops) {
                needed_headroom = ops->needed_headroom;
                needed_tailroom = ops->needed_tailroom;
        } else {
                needed_headroom = MACSEC_NEEDED_HEADROOM;
                needed_tailroom = MACSEC_NEEDED_TAILROOM;
        }

        dev->needed_headroom = real_dev->needed_headroom + needed_headroom;
        dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom;
}

static void macsec_inherit_tso_max(struct net_device *dev)
{
        struct macsec_dev *macsec = macsec_priv(dev);

        /* if macsec is offloaded, we need to follow the lower
         * device's capabilities. otherwise, we can ignore them.
         */
        if (macsec_is_offloaded(macsec))
                netif_inherit_tso_max(dev, macsec->real_dev);
}

static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload)
{
        enum macsec_offload prev_offload;
        const struct macsec_ops *ops;
        struct macsec_context ctx;
        struct macsec_dev *macsec;
        int ret = 0;

        macsec = macsec_priv(dev);

        /* Check if the offloading mode is supported by the underlying layers */
        if (offload != MACSEC_OFFLOAD_OFF &&
            !macsec_check_offload(offload, macsec))
                return -EOPNOTSUPP;

        /* Check if the net device is busy. */
        if (netif_running(dev))
                return -EBUSY;

        /* Check if the device already has rules configured: we do not support
         * rules migration.
         */
        if (macsec_is_configured(macsec))
                return -EBUSY;

        prev_offload = macsec->offload;

        ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
                               macsec, &ctx);
        if (!ops)
                return -EOPNOTSUPP;

        macsec->offload = offload;

        ctx.secy = &macsec->secy;
        ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx)
                                            : macsec_offload(ops->mdo_add_secy, &ctx);
        if (ret) {
                macsec->offload = prev_offload;
                return ret;
        }

        macsec_set_head_tail_room(dev);
        macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops);

        macsec_inherit_tso_max(dev);

        netdev_update_features(dev);

        return ret;
}

static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
{
        struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
        struct nlattr **attrs = info->attrs;
        enum macsec_offload offload;
        struct macsec_dev *macsec;
        struct net_device *dev;
        int ret = 0;

        if (!attrs[MACSEC_ATTR_IFINDEX])
                return -EINVAL;

        if (!attrs[MACSEC_ATTR_OFFLOAD])
                return -EINVAL;

        if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
                                        attrs[MACSEC_ATTR_OFFLOAD],
                                        macsec_genl_offload_policy, NULL))
                return -EINVAL;

        rtnl_lock();

        dev = get_dev_from_nl(genl_info_net(info), attrs);
        if (IS_ERR(dev)) {
                ret = PTR_ERR(dev);
                goto out;
        }
        macsec = macsec_priv(dev);

        if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
                ret = -EINVAL;
                goto out;
        }

        offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);

        if (macsec->offload != offload)
                ret = macsec_update_offload(dev, offload);
out:
        rtnl_unlock();
        return ret;
}

static void get_tx_sa_stats(struct net_device *dev, int an,
                            struct macsec_tx_sa *tx_sa,
                            struct macsec_tx_sa_stats *sum)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        int cpu;

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(macsec)) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(macsec, &ctx);
                if (ops) {
                        ctx.sa.assoc_num = an;
                        ctx.sa.tx_sa = tx_sa;
                        ctx.stats.tx_sa_stats = sum;
                        ctx.secy = &macsec_priv(dev)->secy;
                        macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
                }
                return;
        }

        for_each_possible_cpu(cpu) {
                const struct macsec_tx_sa_stats *stats =
                        per_cpu_ptr(tx_sa->stats, cpu);

                sum->OutPktsProtected += stats->OutPktsProtected;
                sum->OutPktsEncrypted += stats->OutPktsEncrypted;
        }
}

static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
{
        if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
                        sum->OutPktsProtected) ||
            nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
                        sum->OutPktsEncrypted))
                return -EMSGSIZE;

        return 0;
}

static void get_rx_sa_stats(struct net_device *dev,
                            struct macsec_rx_sc *rx_sc, int an,
                            struct macsec_rx_sa *rx_sa,
                            struct macsec_rx_sa_stats *sum)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        int cpu;

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(macsec)) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(macsec, &ctx);
                if (ops) {
                        ctx.sa.assoc_num = an;
                        ctx.sa.rx_sa = rx_sa;
                        ctx.stats.rx_sa_stats = sum;
                        ctx.secy = &macsec_priv(dev)->secy;
                        ctx.rx_sc = rx_sc;
                        macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
                }
                return;
        }

        for_each_possible_cpu(cpu) {
                const struct macsec_rx_sa_stats *stats =
                        per_cpu_ptr(rx_sa->stats, cpu);

                sum->InPktsOK         += stats->InPktsOK;
                sum->InPktsInvalid    += stats->InPktsInvalid;
                sum->InPktsNotValid   += stats->InPktsNotValid;
                sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
                sum->InPktsUnusedSA   += stats->InPktsUnusedSA;
        }
}

static int copy_rx_sa_stats(struct sk_buff *skb,
                            struct macsec_rx_sa_stats *sum)
{
        if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
            nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
                        sum->InPktsInvalid) ||
            nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
                        sum->InPktsNotValid) ||
            nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
                        sum->InPktsNotUsingSA) ||
            nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
                        sum->InPktsUnusedSA))
                return -EMSGSIZE;

        return 0;
}

static void get_rx_sc_stats(struct net_device *dev,
                            struct macsec_rx_sc *rx_sc,
                            struct macsec_rx_sc_stats *sum)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        int cpu;

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(macsec)) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(macsec, &ctx);
                if (ops) {
                        ctx.stats.rx_sc_stats = sum;
                        ctx.secy = &macsec_priv(dev)->secy;
                        ctx.rx_sc = rx_sc;
                        macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
                }
                return;
        }

        for_each_possible_cpu(cpu) {
                const struct pcpu_rx_sc_stats *stats;
                struct macsec_rx_sc_stats tmp;
                unsigned int start;

                stats = per_cpu_ptr(rx_sc->stats, cpu);
                do {
                        start = u64_stats_fetch_begin(&stats->syncp);
                        u64_stats_copy(&tmp, &stats->stats, sizeof(tmp));
                } while (u64_stats_fetch_retry(&stats->syncp, start));

                sum->InOctetsValidated += tmp.InOctetsValidated;
                sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
                sum->InPktsUnchecked   += tmp.InPktsUnchecked;
                sum->InPktsDelayed     += tmp.InPktsDelayed;
                sum->InPktsOK          += tmp.InPktsOK;
                sum->InPktsInvalid     += tmp.InPktsInvalid;
                sum->InPktsLate        += tmp.InPktsLate;
                sum->InPktsNotValid    += tmp.InPktsNotValid;
                sum->InPktsNotUsingSA  += tmp.InPktsNotUsingSA;
                sum->InPktsUnusedSA    += tmp.InPktsUnusedSA;
        }
}

static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
{
        if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
                              sum->InOctetsValidated,
                              MACSEC_RXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
                              sum->InOctetsDecrypted,
                              MACSEC_RXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
                              sum->InPktsUnchecked,
                              MACSEC_RXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
                              sum->InPktsDelayed,
                              MACSEC_RXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
                              sum->InPktsOK,
                              MACSEC_RXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
                              sum->InPktsInvalid,
                              MACSEC_RXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
                              sum->InPktsLate,
                              MACSEC_RXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
                              sum->InPktsNotValid,
                              MACSEC_RXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
                              sum->InPktsNotUsingSA,
                              MACSEC_RXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
                              sum->InPktsUnusedSA,
                              MACSEC_RXSC_STATS_ATTR_PAD))
                return -EMSGSIZE;

        return 0;
}

static void get_tx_sc_stats(struct net_device *dev,
                            struct macsec_tx_sc_stats *sum)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        int cpu;

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(macsec)) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(macsec, &ctx);
                if (ops) {
                        ctx.stats.tx_sc_stats = sum;
                        ctx.secy = &macsec_priv(dev)->secy;
                        macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
                }
                return;
        }

        for_each_possible_cpu(cpu) {
                const struct pcpu_tx_sc_stats *stats;
                struct macsec_tx_sc_stats tmp;
                unsigned int start;

                stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
                do {
                        start = u64_stats_fetch_begin(&stats->syncp);
                        u64_stats_copy(&tmp, &stats->stats, sizeof(tmp));
                } while (u64_stats_fetch_retry(&stats->syncp, start));

                sum->OutPktsProtected   += tmp.OutPktsProtected;
                sum->OutPktsEncrypted   += tmp.OutPktsEncrypted;
                sum->OutOctetsProtected += tmp.OutOctetsProtected;
                sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
        }
}

static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
{
        if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
                              sum->OutPktsProtected,
                              MACSEC_TXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
                              sum->OutPktsEncrypted,
                              MACSEC_TXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
                              sum->OutOctetsProtected,
                              MACSEC_TXSC_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
                              sum->OutOctetsEncrypted,
                              MACSEC_TXSC_STATS_ATTR_PAD))
                return -EMSGSIZE;

        return 0;
}

static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        int cpu;

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(macsec)) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(macsec, &ctx);
                if (ops) {
                        ctx.stats.dev_stats = sum;
                        ctx.secy = &macsec_priv(dev)->secy;
                        macsec_offload(ops->mdo_get_dev_stats, &ctx);
                }
                return;
        }

        for_each_possible_cpu(cpu) {
                const struct pcpu_secy_stats *stats;
                struct macsec_dev_stats tmp;
                unsigned int start;

                stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
                do {
                        start = u64_stats_fetch_begin(&stats->syncp);
                        u64_stats_copy(&tmp, &stats->stats, sizeof(tmp));
                } while (u64_stats_fetch_retry(&stats->syncp, start));

                sum->OutPktsUntagged  += tmp.OutPktsUntagged;
                sum->InPktsUntagged   += tmp.InPktsUntagged;
                sum->OutPktsTooLong   += tmp.OutPktsTooLong;
                sum->InPktsNoTag      += tmp.InPktsNoTag;
                sum->InPktsBadTag     += tmp.InPktsBadTag;
                sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
                sum->InPktsNoSCI      += tmp.InPktsNoSCI;
                sum->InPktsOverrun    += tmp.InPktsOverrun;
        }
}

static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
{
        if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
                              sum->OutPktsUntagged,
                              MACSEC_SECY_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
                              sum->InPktsUntagged,
                              MACSEC_SECY_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
                              sum->OutPktsTooLong,
                              MACSEC_SECY_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
                              sum->InPktsNoTag,
                              MACSEC_SECY_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
                              sum->InPktsBadTag,
                              MACSEC_SECY_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
                              sum->InPktsUnknownSCI,
                              MACSEC_SECY_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
                              sum->InPktsNoSCI,
                              MACSEC_SECY_STATS_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
                              sum->InPktsOverrun,
                              MACSEC_SECY_STATS_ATTR_PAD))
                return -EMSGSIZE;

        return 0;
}

static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
{
        struct macsec_tx_sc *tx_sc = &secy->tx_sc;
        struct nlattr *secy_nest = nla_nest_start_noflag(skb,
                                                         MACSEC_ATTR_SECY);
        u64 csid;

        if (!secy_nest)
                return 1;

        switch (secy->key_len) {
        case MACSEC_GCM_AES_128_SAK_LEN:
                csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
                break;
        case MACSEC_GCM_AES_256_SAK_LEN:
                csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
                break;
        default:
                goto cancel;
        }

        if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
                        MACSEC_SECY_ATTR_PAD) ||
            nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
                              csid, MACSEC_SECY_ATTR_PAD) ||
            nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
            nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
            nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
            nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
            nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
            nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
            nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
            nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
            nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
            nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
                goto cancel;

        if (secy->replay_protect) {
                if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
                        goto cancel;
        }

        nla_nest_end(skb, secy_nest);
        return 0;

cancel:
        nla_nest_cancel(skb, secy_nest);
        return 1;
}

static noinline_for_stack int
dump_secy(struct macsec_secy *secy, struct net_device *dev,
          struct sk_buff *skb, struct netlink_callback *cb)
{
        struct macsec_tx_sc_stats tx_sc_stats = {0, };
        struct macsec_tx_sa_stats tx_sa_stats = {0, };
        struct macsec_rx_sc_stats rx_sc_stats = {0, };
        struct macsec_rx_sa_stats rx_sa_stats = {0, };
        struct macsec_dev *macsec = netdev_priv(dev);
        struct macsec_dev_stats dev_stats = {0, };
        struct macsec_tx_sc *tx_sc = &secy->tx_sc;
        struct nlattr *txsa_list, *rxsc_list;
        struct macsec_rx_sc *rx_sc;
        struct nlattr *attr;
        void *hdr;
        int i, j;

        hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
                          &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
        if (!hdr)
                return -EMSGSIZE;

        genl_dump_check_consistent(cb, hdr);

        if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
                goto nla_put_failure;

        attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
        if (!attr)
                goto nla_put_failure;
        if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
                goto nla_put_failure;
        nla_nest_end(skb, attr);

        if (nla_put_secy(secy, skb))
                goto nla_put_failure;

        attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
        if (!attr)
                goto nla_put_failure;

        get_tx_sc_stats(dev, &tx_sc_stats);
        if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
                nla_nest_cancel(skb, attr);
                goto nla_put_failure;
        }
        nla_nest_end(skb, attr);

        attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
        if (!attr)
                goto nla_put_failure;
        get_secy_stats(dev, &dev_stats);
        if (copy_secy_stats(skb, &dev_stats)) {
                nla_nest_cancel(skb, attr);
                goto nla_put_failure;
        }
        nla_nest_end(skb, attr);

        txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
        if (!txsa_list)
                goto nla_put_failure;
        for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
                struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
                struct nlattr *txsa_nest;
                u64 pn;
                int pn_len;

                if (!tx_sa)
                        continue;

                txsa_nest = nla_nest_start_noflag(skb, j++);
                if (!txsa_nest) {
                        nla_nest_cancel(skb, txsa_list);
                        goto nla_put_failure;
                }

                attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
                if (!attr) {
                        nla_nest_cancel(skb, txsa_nest);
                        nla_nest_cancel(skb, txsa_list);
                        goto nla_put_failure;
                }
                memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
                get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
                if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
                        nla_nest_cancel(skb, attr);
                        nla_nest_cancel(skb, txsa_nest);
                        nla_nest_cancel(skb, txsa_list);
                        goto nla_put_failure;
                }
                nla_nest_end(skb, attr);

                if (secy->xpn) {
                        pn = tx_sa->next_pn;
                        pn_len = MACSEC_XPN_PN_LEN;
                } else {
                        pn = tx_sa->next_pn_halves.lower;
                        pn_len = MACSEC_DEFAULT_PN_LEN;
                }

                if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
                    nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
                    nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
                    (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
                    nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
                        nla_nest_cancel(skb, txsa_nest);
                        nla_nest_cancel(skb, txsa_list);
                        goto nla_put_failure;
                }

                nla_nest_end(skb, txsa_nest);
        }
        nla_nest_end(skb, txsa_list);

        rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
        if (!rxsc_list)
                goto nla_put_failure;

        j = 1;
        for_each_rxsc_rtnl(secy, rx_sc) {
                int k;
                struct nlattr *rxsa_list;
                struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);

                if (!rxsc_nest) {
                        nla_nest_cancel(skb, rxsc_list);
                        goto nla_put_failure;
                }

                if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
                    nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
                                MACSEC_RXSC_ATTR_PAD)) {
                        nla_nest_cancel(skb, rxsc_nest);
                        nla_nest_cancel(skb, rxsc_list);
                        goto nla_put_failure;
                }

                attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
                if (!attr) {
                        nla_nest_cancel(skb, rxsc_nest);
                        nla_nest_cancel(skb, rxsc_list);
                        goto nla_put_failure;
                }
                memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
                get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
                if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
                        nla_nest_cancel(skb, attr);
                        nla_nest_cancel(skb, rxsc_nest);
                        nla_nest_cancel(skb, rxsc_list);
                        goto nla_put_failure;
                }
                nla_nest_end(skb, attr);

                rxsa_list = nla_nest_start_noflag(skb,
                                                  MACSEC_RXSC_ATTR_SA_LIST);
                if (!rxsa_list) {
                        nla_nest_cancel(skb, rxsc_nest);
                        nla_nest_cancel(skb, rxsc_list);
                        goto nla_put_failure;
                }

                for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
                        struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
                        struct nlattr *rxsa_nest;
                        u64 pn;
                        int pn_len;

                        if (!rx_sa)
                                continue;

                        rxsa_nest = nla_nest_start_noflag(skb, k++);
                        if (!rxsa_nest) {
                                nla_nest_cancel(skb, rxsa_list);
                                nla_nest_cancel(skb, rxsc_nest);
                                nla_nest_cancel(skb, rxsc_list);
                                goto nla_put_failure;
                        }

                        attr = nla_nest_start_noflag(skb,
                                                     MACSEC_SA_ATTR_STATS);
                        if (!attr) {
                                nla_nest_cancel(skb, rxsa_list);
                                nla_nest_cancel(skb, rxsc_nest);
                                nla_nest_cancel(skb, rxsc_list);
                                goto nla_put_failure;
                        }
                        memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
                        get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
                        if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
                                nla_nest_cancel(skb, attr);
                                nla_nest_cancel(skb, rxsa_list);
                                nla_nest_cancel(skb, rxsc_nest);
                                nla_nest_cancel(skb, rxsc_list);
                                goto nla_put_failure;
                        }
                        nla_nest_end(skb, attr);

                        if (secy->xpn) {
                                pn = rx_sa->next_pn;
                                pn_len = MACSEC_XPN_PN_LEN;
                        } else {
                                pn = rx_sa->next_pn_halves.lower;
                                pn_len = MACSEC_DEFAULT_PN_LEN;
                        }

                        if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
                            nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
                            nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
                            (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
                            nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
                                nla_nest_cancel(skb, rxsa_nest);
                                nla_nest_cancel(skb, rxsc_nest);
                                nla_nest_cancel(skb, rxsc_list);
                                goto nla_put_failure;
                        }
                        nla_nest_end(skb, rxsa_nest);
                }

                nla_nest_end(skb, rxsa_list);
                nla_nest_end(skb, rxsc_nest);
        }

        nla_nest_end(skb, rxsc_list);

        genlmsg_end(skb, hdr);

        return 0;

nla_put_failure:
        genlmsg_cancel(skb, hdr);
        return -EMSGSIZE;
}

static int macsec_generation = 1; /* protected by RTNL */

static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
{
        struct net *net = sock_net(skb->sk);
        struct net_device *dev;
        int dev_idx, d;

        dev_idx = cb->args[0];

        d = 0;
        rtnl_lock();

        cb->seq = macsec_generation;

        for_each_netdev(net, dev) {
                struct macsec_secy *secy;

                if (d < dev_idx)
                        goto next;

                if (!netif_is_macsec(dev))
                        goto next;

                secy = &macsec_priv(dev)->secy;
                if (dump_secy(secy, dev, skb, cb) < 0)
                        goto done;
next:
                d++;
        }

done:
        rtnl_unlock();
        cb->args[0] = d;
        return skb->len;
}

static const struct genl_small_ops macsec_genl_ops[] = {
        {
                .cmd = MACSEC_CMD_GET_TXSC,
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .dumpit = macsec_dump_txsc,
        },
        {
                .cmd = MACSEC_CMD_ADD_RXSC,
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = macsec_add_rxsc,
                .flags = GENL_ADMIN_PERM,
        },
        {
                .cmd = MACSEC_CMD_DEL_RXSC,
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = macsec_del_rxsc,
                .flags = GENL_ADMIN_PERM,
        },
        {
                .cmd = MACSEC_CMD_UPD_RXSC,
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = macsec_upd_rxsc,
                .flags = GENL_ADMIN_PERM,
        },
        {
                .cmd = MACSEC_CMD_ADD_TXSA,
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = macsec_add_txsa,
                .flags = GENL_ADMIN_PERM,
        },
        {
                .cmd = MACSEC_CMD_DEL_TXSA,
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = macsec_del_txsa,
                .flags = GENL_ADMIN_PERM,
        },
        {
                .cmd = MACSEC_CMD_UPD_TXSA,
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = macsec_upd_txsa,
                .flags = GENL_ADMIN_PERM,
        },
        {
                .cmd = MACSEC_CMD_ADD_RXSA,
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = macsec_add_rxsa,
                .flags = GENL_ADMIN_PERM,
        },
        {
                .cmd = MACSEC_CMD_DEL_RXSA,
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = macsec_del_rxsa,
                .flags = GENL_ADMIN_PERM,
        },
        {
                .cmd = MACSEC_CMD_UPD_RXSA,
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = macsec_upd_rxsa,
                .flags = GENL_ADMIN_PERM,
        },
        {
                .cmd = MACSEC_CMD_UPD_OFFLOAD,
                .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
                .doit = macsec_upd_offload,
                .flags = GENL_ADMIN_PERM,
        },
};

static struct genl_family macsec_fam __ro_after_init = {
        .name           = MACSEC_GENL_NAME,
        .hdrsize        = 0,
        .version        = MACSEC_GENL_VERSION,
        .maxattr        = MACSEC_ATTR_MAX,
        .policy = macsec_genl_policy,
        .netnsok        = true,
        .module         = THIS_MODULE,
        .small_ops      = macsec_genl_ops,
        .n_small_ops    = ARRAY_SIZE(macsec_genl_ops),
        .resv_start_op  = MACSEC_CMD_UPD_OFFLOAD + 1,
};

static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb,
                                            struct net_device *dev)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        const struct macsec_ops *ops;
        struct phy_device *phydev;
        struct macsec_context ctx;
        int skb_final_len;
        int err;

        ops = macsec_get_ops(macsec, &ctx);
        skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom +
                ops->needed_tailroom;
        if (unlikely(skb_final_len > macsec->real_dev->mtu)) {
                err = -EINVAL;
                goto cleanup;
        }

        phydev = macsec->real_dev->phydev;

        err = skb_ensure_writable_head_tail(skb, dev);
        if (unlikely(err < 0))
                goto cleanup;

        err = ops->mdo_insert_tx_tag(phydev, skb);
        if (unlikely(err))
                goto cleanup;

        return skb;
cleanup:
        kfree_skb(skb);
        return ERR_PTR(err);
}

static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
                                     struct net_device *dev)
{
        struct macsec_dev *macsec = netdev_priv(dev);
        struct macsec_secy *secy = &macsec->secy;
        struct pcpu_secy_stats *secy_stats;
        int ret, len;

        if (macsec_is_offloaded(netdev_priv(dev))) {
                struct metadata_dst *md_dst = secy->tx_sc.md_dst;

                skb_dst_drop(skb);
                dst_hold(&md_dst->dst);
                skb_dst_set(skb, &md_dst->dst);

                if (macsec->insert_tx_tag) {
                        skb = macsec_insert_tx_tag(skb, dev);
                        if (IS_ERR(skb)) {
                                DEV_STATS_INC(dev, tx_dropped);
                                return NETDEV_TX_OK;
                        }
                }

                skb->dev = macsec->real_dev;
                return dev_queue_xmit(skb);
        }

        /* 10.5 */
        if (!secy->protect_frames) {
                secy_stats = this_cpu_ptr(macsec->stats);
                u64_stats_update_begin(&secy_stats->syncp);
                secy_stats->stats.OutPktsUntagged++;
                u64_stats_update_end(&secy_stats->syncp);
                skb->dev = macsec->real_dev;
                len = skb->len;
                ret = dev_queue_xmit(skb);
                count_tx(dev, ret, len);
                return ret;
        }

        if (!secy->operational) {
                kfree_skb(skb);
                DEV_STATS_INC(dev, tx_dropped);
                return NETDEV_TX_OK;
        }

        len = skb->len;
        skb = macsec_encrypt(skb, dev);
        if (IS_ERR(skb)) {
                if (PTR_ERR(skb) != -EINPROGRESS)
                        DEV_STATS_INC(dev, tx_dropped);
                return NETDEV_TX_OK;
        }

        macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);

        macsec_encrypt_finish(skb, dev);
        ret = dev_queue_xmit(skb);
        count_tx(dev, ret, len);
        return ret;
}

#define MACSEC_FEATURES \
        (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)

#define MACSEC_OFFLOAD_FEATURES \
        (MACSEC_FEATURES | NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES | \
         NETIF_F_LRO | NETIF_F_RXHASH | NETIF_F_CSUM_MASK | NETIF_F_RXCSUM)

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

        err = gro_cells_init(&macsec->gro_cells, dev);
        if (err)
                return err;

        macsec_inherit_tso_max(dev);

        dev->hw_features = real_dev->hw_features & MACSEC_OFFLOAD_FEATURES;
        dev->hw_features |= NETIF_F_GSO_SOFTWARE;

        dev->features = real_dev->features & MACSEC_OFFLOAD_FEATURES;
        dev->features |= NETIF_F_GSO_SOFTWARE;
        dev->lltx = true;
        dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;

        macsec_set_head_tail_room(dev);

        if (is_zero_ether_addr(dev->dev_addr))
                eth_hw_addr_inherit(dev, real_dev);
        if (is_zero_ether_addr(dev->broadcast))
                memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);

        /* Get macsec's reference to real_dev */
        netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);

        return 0;
}

static void macsec_dev_uninit(struct net_device *dev)
{
        struct macsec_dev *macsec = macsec_priv(dev);

        gro_cells_destroy(&macsec->gro_cells);
}

static netdev_features_t macsec_fix_features(struct net_device *dev,
                                             netdev_features_t features)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        struct net_device *real_dev = macsec->real_dev;
        netdev_features_t mask;

        mask = macsec_is_offloaded(macsec) ? MACSEC_OFFLOAD_FEATURES
                                           : MACSEC_FEATURES;

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

        return features;
}

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

        err = dev_uc_add(real_dev, dev->dev_addr);
        if (err < 0)
                return err;

        if (dev->flags & IFF_ALLMULTI) {
                err = dev_set_allmulti(real_dev, 1);
                if (err < 0)
                        goto del_unicast;
        }

        if (dev->flags & IFF_PROMISC) {
                err = dev_set_promiscuity(real_dev, 1);
                if (err < 0)
                        goto clear_allmulti;
        }

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(macsec)) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (!ops) {
                        err = -EOPNOTSUPP;
                        goto clear_allmulti;
                }

                ctx.secy = &macsec->secy;
                err = macsec_offload(ops->mdo_dev_open, &ctx);
                if (err)
                        goto clear_allmulti;
        }

        if (netif_carrier_ok(real_dev))
                netif_carrier_on(dev);

        return 0;
clear_allmulti:
        if (dev->flags & IFF_ALLMULTI)
                dev_set_allmulti(real_dev, -1);
del_unicast:
        dev_uc_del(real_dev, dev->dev_addr);
        netif_carrier_off(dev);
        return err;
}

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

        netif_carrier_off(dev);

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(macsec)) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(macsec, &ctx);
                if (ops) {
                        ctx.secy = &macsec->secy;
                        macsec_offload(ops->mdo_dev_stop, &ctx);
                }
        }

        dev_mc_unsync(real_dev, dev);
        dev_uc_unsync(real_dev, dev);

        if (dev->flags & IFF_ALLMULTI)
                dev_set_allmulti(real_dev, -1);

        if (dev->flags & IFF_PROMISC)
                dev_set_promiscuity(real_dev, -1);

        dev_uc_del(real_dev, dev->dev_addr);

        return 0;
}

static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
{
        struct net_device *real_dev = macsec_priv(dev)->real_dev;

        if (!(dev->flags & IFF_UP))
                return;

        if (change & IFF_ALLMULTI)
                dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);

        if (change & IFF_PROMISC)
                dev_set_promiscuity(real_dev,
                                    dev->flags & IFF_PROMISC ? 1 : -1);
}

static void macsec_dev_set_rx_mode(struct net_device *dev)
{
        struct net_device *real_dev = macsec_priv(dev)->real_dev;

        dev_mc_sync(real_dev, dev);
        dev_uc_sync(real_dev, dev);
}

static int macsec_set_mac_address(struct net_device *dev, void *p)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        struct net_device *real_dev = macsec->real_dev;
        struct sockaddr *addr = p;
        u8  old_addr[ETH_ALEN];
        int err;

        if (!is_valid_ether_addr(addr->sa_data))
                return -EADDRNOTAVAIL;

        if (dev->flags & IFF_UP) {
                err = dev_uc_add(real_dev, addr->sa_data);
                if (err < 0)
                        return err;
        }

        ether_addr_copy(old_addr, dev->dev_addr);
        eth_hw_addr_set(dev, addr->sa_data);

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(macsec)) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(macsec, &ctx);
                if (!ops) {
                        err = -EOPNOTSUPP;
                        goto restore_old_addr;
                }

                ctx.secy = &macsec->secy;
                err = macsec_offload(ops->mdo_upd_secy, &ctx);
                if (err)
                        goto restore_old_addr;
        }

        if (dev->flags & IFF_UP)
                dev_uc_del(real_dev, old_addr);

        return 0;

restore_old_addr:
        if (dev->flags & IFF_UP)
                dev_uc_del(real_dev, addr->sa_data);

        eth_hw_addr_set(dev, old_addr);

        return err;
}

static int macsec_change_mtu(struct net_device *dev, int new_mtu)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);

        if (macsec->real_dev->mtu - extra < new_mtu)
                return -ERANGE;

        WRITE_ONCE(dev->mtu, new_mtu);

        return 0;
}

static void macsec_get_stats64(struct net_device *dev,
                               struct rtnl_link_stats64 *s)
{
        if (!dev->tstats)
                return;

        dev_fetch_sw_netstats(s, dev->tstats);

        s->rx_dropped = DEV_STATS_READ(dev, rx_dropped);
        s->tx_dropped = DEV_STATS_READ(dev, tx_dropped);
        s->rx_errors = DEV_STATS_READ(dev, rx_errors);
}

static int macsec_get_iflink(const struct net_device *dev)
{
        return READ_ONCE(macsec_priv(dev)->real_dev->ifindex);
}

static const struct net_device_ops macsec_netdev_ops = {
        .ndo_init               = macsec_dev_init,
        .ndo_uninit             = macsec_dev_uninit,
        .ndo_open               = macsec_dev_open,
        .ndo_stop               = macsec_dev_stop,
        .ndo_fix_features       = macsec_fix_features,
        .ndo_change_mtu         = macsec_change_mtu,
        .ndo_set_rx_mode        = macsec_dev_set_rx_mode,
        .ndo_change_rx_flags    = macsec_dev_change_rx_flags,
        .ndo_set_mac_address    = macsec_set_mac_address,
        .ndo_start_xmit         = macsec_start_xmit,
        .ndo_get_stats64        = macsec_get_stats64,
        .ndo_get_iflink         = macsec_get_iflink,
};

static const struct device_type macsec_type = {
        .name = "macsec",
};

static int validate_cipher_suite(const struct nlattr *attr,
                                 struct netlink_ext_ack *extack);
static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
        [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
        [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
        [IFLA_MACSEC_ICV_LEN] = NLA_POLICY_RANGE(NLA_U8, MACSEC_MIN_ICV_LEN, MACSEC_STD_ICV_LEN),
        [IFLA_MACSEC_CIPHER_SUITE] = NLA_POLICY_VALIDATE_FN(NLA_U64, validate_cipher_suite),
        [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
        [IFLA_MACSEC_ENCODING_SA] = NLA_POLICY_MAX(NLA_U8, MACSEC_NUM_AN - 1),
        [IFLA_MACSEC_ENCRYPT] = NLA_POLICY_MAX(NLA_U8, 1),
        [IFLA_MACSEC_PROTECT] = NLA_POLICY_MAX(NLA_U8, 1),
        [IFLA_MACSEC_INC_SCI] = NLA_POLICY_MAX(NLA_U8, 1),
        [IFLA_MACSEC_ES] = NLA_POLICY_MAX(NLA_U8, 1),
        [IFLA_MACSEC_SCB] = NLA_POLICY_MAX(NLA_U8, 1),
        [IFLA_MACSEC_REPLAY_PROTECT] = NLA_POLICY_MAX(NLA_U8, 1),
        [IFLA_MACSEC_VALIDATION] = NLA_POLICY_MAX(NLA_U8, MACSEC_VALIDATE_MAX),
        [IFLA_MACSEC_OFFLOAD] = NLA_POLICY_MAX(NLA_U8, MACSEC_OFFLOAD_MAX),
};

static void macsec_free_netdev(struct net_device *dev)
{
        struct macsec_dev *macsec = macsec_priv(dev);

        dst_release(&macsec->secy.tx_sc.md_dst->dst);
        free_percpu(macsec->stats);
        free_percpu(macsec->secy.tx_sc.stats);

        /* Get rid of the macsec's reference to real_dev */
        netdev_put(macsec->real_dev, &macsec->dev_tracker);
}

static void macsec_setup(struct net_device *dev)
{
        ether_setup(dev);
        dev->min_mtu = 0;
        dev->max_mtu = ETH_MAX_MTU;
        dev->priv_flags |= IFF_NO_QUEUE | IFF_UNICAST_FLT;
        dev->netdev_ops = &macsec_netdev_ops;
        dev->needs_free_netdev = true;
        dev->priv_destructor = macsec_free_netdev;
        SET_NETDEV_DEVTYPE(dev, &macsec_type);

        eth_zero_addr(dev->broadcast);
}

static int macsec_changelink_common(struct net_device *dev,
                                    struct nlattr *data[])
{
        struct macsec_secy *secy;
        struct macsec_tx_sc *tx_sc;

        secy = &macsec_priv(dev)->secy;
        tx_sc = &secy->tx_sc;

        if (data[IFLA_MACSEC_ENCODING_SA]) {
                struct macsec_tx_sa *tx_sa;

                tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
                tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);

                secy->operational = tx_sa && tx_sa->active;
        }

        if (data[IFLA_MACSEC_ENCRYPT])
                tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);

        if (data[IFLA_MACSEC_PROTECT])
                secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);

        if (data[IFLA_MACSEC_INC_SCI])
                tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);

        if (data[IFLA_MACSEC_ES])
                tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);

        if (data[IFLA_MACSEC_SCB])
                tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);

        if (data[IFLA_MACSEC_REPLAY_PROTECT])
                secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);

        if (data[IFLA_MACSEC_VALIDATION])
                secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);

        if (data[IFLA_MACSEC_CIPHER_SUITE]) {
                switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
                case MACSEC_CIPHER_ID_GCM_AES_128:
                case MACSEC_DEFAULT_CIPHER_ID:
                        secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
                        secy->xpn = false;
                        break;
                case MACSEC_CIPHER_ID_GCM_AES_256:
                        secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
                        secy->xpn = false;
                        break;
                case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
                        secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
                        secy->xpn = true;
                        break;
                case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
                        secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
                        secy->xpn = true;
                        break;
                default:
                        return -EINVAL;
                }
        }

        if (data[IFLA_MACSEC_WINDOW]) {
                secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);

                /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
                 * for XPN cipher suites */
                if (secy->xpn &&
                    secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
                        return -EINVAL;
        }

        return 0;
}

static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
                             struct nlattr *data[],
                             struct netlink_ext_ack *extack)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        bool macsec_offload_state_change = false;
        enum macsec_offload offload;
        struct macsec_tx_sc tx_sc;
        struct macsec_secy secy;
        int ret;

        if (!data)
                return 0;

        if (data[IFLA_MACSEC_CIPHER_SUITE] ||
            data[IFLA_MACSEC_ICV_LEN] ||
            data[IFLA_MACSEC_SCI] ||
            data[IFLA_MACSEC_PORT])
                return -EINVAL;

        /* Keep a copy of unmodified secy and tx_sc, in case the offload
         * propagation fails, to revert macsec_changelink_common.
         */
        memcpy(&secy, &macsec->secy, sizeof(secy));
        memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));

        ret = macsec_changelink_common(dev, data);
        if (ret)
                goto cleanup;

        if (data[IFLA_MACSEC_OFFLOAD]) {
                offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]);
                if (macsec->offload != offload) {
                        macsec_offload_state_change = true;
                        ret = macsec_update_offload(dev, offload);
                        if (ret)
                                goto cleanup;
                }
        }

        /* If h/w offloading is available, propagate to the device */
        if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (!ops) {
                        ret = -EOPNOTSUPP;
                        goto cleanup;
                }

                ctx.secy = &macsec->secy;
                ret = macsec_offload(ops->mdo_upd_secy, &ctx);
                if (ret)
                        goto cleanup;
        }

        return 0;

cleanup:
        memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
        memcpy(&macsec->secy, &secy, sizeof(secy));

        return ret;
}

static void macsec_del_dev(struct macsec_dev *macsec)
{
        int i;

        while (macsec->secy.rx_sc) {
                struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);

                rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
                free_rx_sc(rx_sc);
        }

        for (i = 0; i < MACSEC_NUM_AN; i++) {
                struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);

                if (sa) {
                        RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
                        clear_tx_sa(sa);
                }
        }
}

static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        struct net_device *real_dev = macsec->real_dev;

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(macsec)) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(netdev_priv(dev), &ctx);
                if (ops) {
                        ctx.secy = &macsec->secy;
                        macsec_offload(ops->mdo_del_secy, &ctx);
                }
        }

        unregister_netdevice_queue(dev, head);
        list_del_rcu(&macsec->secys);
        macsec_del_dev(macsec);
        netdev_upper_dev_unlink(real_dev, dev);

        macsec_generation++;
}

static void macsec_dellink(struct net_device *dev, struct list_head *head)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        struct net_device *real_dev = macsec->real_dev;
        struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);

        macsec_common_dellink(dev, head);

        if (list_empty(&rxd->secys)) {
                netdev_rx_handler_unregister(real_dev);
                kfree(rxd);
        }
}

static int register_macsec_dev(struct net_device *real_dev,
                               struct net_device *dev)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);

        if (!rxd) {
                int err;

                rxd = kmalloc_obj(*rxd);
                if (!rxd)
                        return -ENOMEM;

                INIT_LIST_HEAD(&rxd->secys);

                err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
                                                 rxd);
                if (err < 0) {
                        kfree(rxd);
                        return err;
                }
        }

        list_add_tail_rcu(&macsec->secys, &rxd->secys);
        return 0;
}

static bool sci_exists(struct net_device *dev, sci_t sci)
{
        struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
        struct macsec_dev *macsec;

        list_for_each_entry(macsec, &rxd->secys, secys) {
                if (macsec->secy.sci == sci)
                        return true;
        }

        return false;
}

static sci_t dev_to_sci(struct net_device *dev, __be16 port)
{
        return make_sci(dev->dev_addr, port);
}

static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
{
        struct macsec_dev *macsec = macsec_priv(dev);
        struct macsec_secy *secy = &macsec->secy;

        macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
        if (!macsec->stats)
                return -ENOMEM;

        secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
        if (!secy->tx_sc.stats)
                return -ENOMEM;

        secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
        if (!secy->tx_sc.md_dst)
                /* macsec and secy percpu stats will be freed when unregistering
                 * net_device in macsec_free_netdev()
                 */
                return -ENOMEM;

        if (sci == MACSEC_UNDEF_SCI)
                sci = dev_to_sci(dev, MACSEC_PORT_ES);

        secy->netdev = dev;
        secy->operational = true;
        secy->key_len = DEFAULT_SAK_LEN;
        secy->icv_len = icv_len;
        secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
        secy->protect_frames = true;
        secy->replay_protect = false;
        secy->xpn = DEFAULT_XPN;

        secy->sci = sci;
        secy->tx_sc.md_dst->u.macsec_info.sci = sci;
        secy->tx_sc.active = true;
        secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
        secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
        secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
        secy->tx_sc.end_station = false;
        secy->tx_sc.scb = false;

        return 0;
}

static struct lock_class_key macsec_netdev_addr_lock_key;

static int macsec_newlink(struct net_device *dev,
                          struct rtnl_newlink_params *params,
                          struct netlink_ext_ack *extack)
{
        struct net *link_net = rtnl_newlink_link_net(params);
        struct macsec_dev *macsec = macsec_priv(dev);
        struct nlattr **data = params->data;
        struct nlattr **tb = params->tb;
        rx_handler_func_t *rx_handler;
        u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
        struct net_device *real_dev;
        int err, mtu;
        sci_t sci;

        if (!tb[IFLA_LINK])
                return -EINVAL;
        real_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK]));
        if (!real_dev)
                return -ENODEV;
        if (real_dev->type != ARPHRD_ETHER)
                return -EINVAL;

        dev->priv_flags |= IFF_MACSEC;

        macsec->real_dev = real_dev;

        if (data && data[IFLA_MACSEC_OFFLOAD])
                macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
        else
                /* MACsec offloading is off by default */
                macsec->offload = MACSEC_OFFLOAD_OFF;

        /* Check if the offloading mode is supported by the underlying layers */
        if (macsec->offload != MACSEC_OFFLOAD_OFF &&
            !macsec_check_offload(macsec->offload, macsec))
                return -EOPNOTSUPP;

        /* send_sci must be set to true when transmit sci explicitly is set */
        if ((data && data[IFLA_MACSEC_SCI]) &&
            (data && data[IFLA_MACSEC_INC_SCI])) {
                u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);

                if (!send_sci)
                        return -EINVAL;
        }

        if (data && data[IFLA_MACSEC_ICV_LEN])
                icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
        mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
        if (mtu < 0)
                dev->mtu = 0;
        else
                dev->mtu = mtu;

        rx_handler = rtnl_dereference(real_dev->rx_handler);
        if (rx_handler && rx_handler != macsec_handle_frame)
                return -EBUSY;

        err = register_netdevice(dev);
        if (err < 0)
                return err;

        netdev_lockdep_set_classes(dev);
        lockdep_set_class(&dev->addr_list_lock,
                          &macsec_netdev_addr_lock_key);

        err = netdev_upper_dev_link(real_dev, dev, extack);
        if (err < 0)
                goto unregister;

        /* need to be already registered so that ->init has run and
         * the MAC addr is set
         */
        if (data && data[IFLA_MACSEC_SCI])
                sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
        else if (data && data[IFLA_MACSEC_PORT])
                sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
        else
                sci = dev_to_sci(dev, MACSEC_PORT_ES);

        if (rx_handler && sci_exists(real_dev, sci)) {
                err = -EBUSY;
                goto unlink;
        }

        err = macsec_add_dev(dev, sci, icv_len);
        if (err)
                goto unlink;

        if (data) {
                err = macsec_changelink_common(dev, data);
                if (err)
                        goto del_dev;
        }

        /* If h/w offloading is available, propagate to the device */
        if (macsec_is_offloaded(macsec)) {
                const struct macsec_ops *ops;
                struct macsec_context ctx;

                ops = macsec_get_ops(macsec, &ctx);
                if (ops) {
                        ctx.secy = &macsec->secy;
                        err = macsec_offload(ops->mdo_add_secy, &ctx);
                        if (err)
                                goto del_dev;

                        macsec->insert_tx_tag =
                                macsec_needs_tx_tag(macsec, ops);
                }
        }

        err = register_macsec_dev(real_dev, dev);
        if (err < 0)
                goto del_dev;

        netdev_update_features(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 validate_cipher_suite(const struct nlattr *attr,
                                 struct netlink_ext_ack *extack)
{
        switch (nla_get_u64(attr)) {
        case MACSEC_CIPHER_ID_GCM_AES_128:
        case MACSEC_CIPHER_ID_GCM_AES_256:
        case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
        case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
        case MACSEC_DEFAULT_CIPHER_ID:
                return 0;
        default:
                return -EINVAL;
        }
}

static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
                                struct netlink_ext_ack *extack)
{
        u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
        bool es, scb, sci;

        if (!data)
                return 0;

        if (data[IFLA_MACSEC_ICV_LEN]) {
                icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
                if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
                        char dummy_key[DEFAULT_SAK_LEN] = { 0 };
                        struct crypto_aead *dummy_tfm;

                        dummy_tfm = macsec_alloc_tfm(dummy_key,
                                                     DEFAULT_SAK_LEN,
                                                     icv_len);
                        if (IS_ERR(dummy_tfm))
                                return PTR_ERR(dummy_tfm);
                        crypto_free_aead(dummy_tfm);
                }
        }

        es  = nla_get_u8_default(data[IFLA_MACSEC_ES], false);
        sci = nla_get_u8_default(data[IFLA_MACSEC_INC_SCI], false);
        scb = nla_get_u8_default(data[IFLA_MACSEC_SCB], false);

        if ((sci && (scb || es)) || (scb && es))
                return -EINVAL;

        if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
             nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
            !data[IFLA_MACSEC_WINDOW])
                return -EINVAL;

        return 0;
}

static struct net *macsec_get_link_net(const struct net_device *dev)
{
        return dev_net(macsec_priv(dev)->real_dev);
}

struct net_device *macsec_get_real_dev(const struct net_device *dev)
{
        return macsec_priv(dev)->real_dev;
}
EXPORT_SYMBOL_GPL(macsec_get_real_dev);

bool macsec_netdev_is_offloaded(struct net_device *dev)
{
        return macsec_is_offloaded(macsec_priv(dev));
}
EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded);

static size_t macsec_get_size(const struct net_device *dev)
{
        return  nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
                nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
                nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
                nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
                nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
                nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
                nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
                nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
                nla_total_size(1) + /* IFLA_MACSEC_ES */
                nla_total_size(1) + /* IFLA_MACSEC_SCB */
                nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
                nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
                nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */
                0;
}

static int macsec_fill_info(struct sk_buff *skb,
                            const struct net_device *dev)
{
        struct macsec_tx_sc *tx_sc;
        struct macsec_dev *macsec;
        struct macsec_secy *secy;
        u64 csid;

        macsec = macsec_priv(dev);
        secy = &macsec->secy;
        tx_sc = &secy->tx_sc;

        switch (secy->key_len) {
        case MACSEC_GCM_AES_128_SAK_LEN:
                csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
                break;
        case MACSEC_GCM_AES_256_SAK_LEN:
                csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
                break;
        default:
                goto nla_put_failure;
        }

        if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
                        IFLA_MACSEC_PAD) ||
            nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
            nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
                              csid, IFLA_MACSEC_PAD) ||
            nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
            nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
            nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
            nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
            nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
            nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
            nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
            nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
            nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, macsec->offload) ||
            0)
                goto nla_put_failure;

        if (secy->replay_protect) {
                if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
                        goto nla_put_failure;
        }

        return 0;

nla_put_failure:
        return -EMSGSIZE;
}

static struct rtnl_link_ops macsec_link_ops __read_mostly = {
        .kind           = "macsec",
        .priv_size      = sizeof(struct macsec_dev),
        .maxtype        = IFLA_MACSEC_MAX,
        .policy         = macsec_rtnl_policy,
        .setup          = macsec_setup,
        .validate       = macsec_validate_attr,
        .newlink        = macsec_newlink,
        .changelink     = macsec_changelink,
        .dellink        = macsec_dellink,
        .get_size       = macsec_get_size,
        .fill_info      = macsec_fill_info,
        .get_link_net   = macsec_get_link_net,
};

static bool is_macsec_master(struct net_device *dev)
{
        return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
}

static int macsec_notify(struct notifier_block *this, unsigned long event,
                         void *ptr)
{
        struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
        struct macsec_rxh_data *rxd;
        struct macsec_dev *m, *n;
        LIST_HEAD(head);

        if (!is_macsec_master(real_dev))
                return NOTIFY_DONE;

        rxd = macsec_data_rtnl(real_dev);

        switch (event) {
        case NETDEV_DOWN:
        case NETDEV_UP:
        case NETDEV_CHANGE:
                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:
                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:
                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);
                }
                break;
        case NETDEV_FEAT_CHANGE:
                list_for_each_entry(m, &rxd->secys, secys) {
                        macsec_inherit_tso_max(m->secy.netdev);
                        netdev_update_features(m->secy.netdev);
                }
                break;
        }

        return NOTIFY_OK;
}

static struct notifier_block macsec_notifier = {
        .notifier_call = macsec_notify,
};

static int __init macsec_init(void)
{
        int err;

        pr_info("MACsec IEEE 802.1AE\n");
        err = register_netdevice_notifier(&macsec_notifier);
        if (err)
                return err;

        err = rtnl_link_register(&macsec_link_ops);
        if (err)
                goto notifier;

        err = genl_register_family(&macsec_fam);
        if (err)
                goto rtnl;

        return 0;

rtnl:
        rtnl_link_unregister(&macsec_link_ops);
notifier:
        unregister_netdevice_notifier(&macsec_notifier);
        return err;
}

static void __exit macsec_exit(void)
{
        genl_unregister_family(&macsec_fam);
        rtnl_link_unregister(&macsec_link_ops);
        unregister_netdevice_notifier(&macsec_notifier);
        rcu_barrier();
}

module_init(macsec_init);
module_exit(macsec_exit);

MODULE_ALIAS_RTNL_LINK("macsec");
MODULE_ALIAS_GENL_FAMILY("macsec");

MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
MODULE_LICENSE("GPL v2");