macsec.c 108.0 KB
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
 * 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>
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#include <linux/netdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/refcount.h>
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#include <net/genetlink.h>
#include <net/sock.h>
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#include <net/gro_cells.h>
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#include <net/macsec.h>
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#include <net/dst_metadata.h>
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#include <linux/phy.h>
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#include <linux/byteorder/generic.h>
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#include <linux/if_arp.h>
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#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

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

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#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;

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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
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 * @dev_tracker: refcount tracker for @real_dev reference
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 * @stats: MACsec device stats
 * @secys: linked list of SecY's on the underlying device
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 * @gro_cells: pointer to the Generic Receive Offload cell
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 * @offload: status of offloading on the MACsec device
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 */
struct macsec_dev {
	struct macsec_secy secy;
	struct net_device *real_dev;
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	netdevice_tracker dev_tracker;
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	struct pcpu_secy_stats __percpu *stats;
	struct list_head secys;
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	struct gro_cells gro_cells;
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	enum macsec_offload offload;
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};

/**
 * 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;

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

	return sa;
}

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static struct macsec_rx_sa *macsec_active_rxsa_get(struct macsec_rx_sc *rx_sc)
{
	struct macsec_rx_sa *sa = NULL;
	int an;

	for (an = 0; an < MACSEC_NUM_AN; an++)	{
		sa = macsec_rxsa_get(rx_sc->sa[an]);
		if (sa)
			break;
	}
	return sa;
}

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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)
{
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	return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
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}

static void macsec_rxsc_put(struct macsec_rx_sc *sc)
{
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	if (refcount_dec_and_test(&sc->refcnt))
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		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)
{
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	if (refcount_dec_and_test(&sa->refcnt))
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		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;

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	if (!refcount_inc_not_zero(&sa->refcnt))
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		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)
{
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	if (refcount_dec_and_test(&sa->refcnt))
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		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)
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#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
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#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
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#define DEFAULT_XPN false
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#define DEFAULT_SEND_SCI true
#define DEFAULT_ENCRYPT false
#define DEFAULT_ENCODING_SA 0
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#define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
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static sci_t make_sci(const u8 *addr, __be16 port)
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{
	sci_t sci;

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

	return sci;
}

static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
{
	sci_t sci;

	if (sci_present)
		memcpy(&sci, hdr->secure_channel_id,
		       sizeof(hdr->secure_channel_id));
	else
		sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);

	return sci;
}

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

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

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

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

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

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	if (sci_present) {
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		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;
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	else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN)
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		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;
}

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/* Checks if a MACsec interface is being offloaded to an hardware engine */
static bool macsec_is_offloaded(struct macsec_dev *macsec)
{
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	if (macsec->offload == MACSEC_OFFLOAD_MAC ||
	    macsec->offload == MACSEC_OFFLOAD_PHY)
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		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;
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	else if (offload == MACSEC_OFFLOAD_MAC)
		return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
		       macsec->real_dev->macsec_ops;
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	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;
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		else if (offload == MACSEC_OFFLOAD_MAC)
			ctx->netdev = macsec->real_dev;
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	}

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

/* 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);
}

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/* 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)
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{
	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;

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

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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);
}

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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);

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static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
			    struct macsec_secy *secy)
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{
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	pn_t pn;
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	spin_lock_bh(&tx_sa->lock);

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

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	if (tx_sa->next_pn == 0)
		__macsec_pn_wrapped(secy, tx_sa);
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	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;
}

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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;
}

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

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

static void count_tx(struct net_device *dev, int ret, int len)
{
	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
		struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);

		u64_stats_update_begin(&stats->syncp);
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		u64_stats_inc(&stats->tx_packets);
		u64_stats_add(&stats->tx_bytes, len);
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		u64_stats_update_end(&stats->syncp);
	}
}

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

	aead_request_free(macsec_skb_cb(skb)->req);

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

	macsec_txsa_put(sa);
	dev_put(dev);
}

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static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
					     unsigned char **iv,
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					     struct scatterlist **sg,
					     int num_frags)
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{
	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;
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	size += sizeof(struct scatterlist) * num_frags;
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	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;
}

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static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
				      struct net_device *dev)
{
	int ret;
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	struct scatterlist *sg;
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	struct sk_buff *trailer;
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	unsigned char *iv;
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	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);
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	bool sci_present;
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	pn_t pn;
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	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);
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	sci_present = macsec_send_sci(secy);
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	hh = skb_push(skb, macsec_extra_len(sci_present));
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	memmove(hh, eth, 2 * ETH_ALEN);

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

664 665 666 667 668 669 670 671
	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);
672 673 674 675 676 677
	if (!req) {
		macsec_txsa_put(tx_sa);
		kfree_skb(skb);
		return ERR_PTR(-ENOMEM);
	}

678 679 680 681
	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);
682

683
	sg_init_table(sg, ret);
684 685
	ret = skb_to_sgvec(skb, sg, 0, skb->len);
	if (unlikely(ret < 0)) {
686
		aead_request_free(req);
687 688 689 690
		macsec_txsa_put(tx_sa);
		kfree_skb(skb);
		return ERR_PTR(ret);
	}
691 692

	if (tx_sc->encrypt) {
693
		int len = skb->len - macsec_hdr_len(sci_present) -
694 695
			  secy->icv_len;
		aead_request_set_crypt(req, sg, sg, len, iv);
696
		aead_request_set_ad(req, macsec_hdr_len(sci_present));
697 698 699 700 701 702 703
	} 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;
704
	macsec_skb_cb(skb)->has_sci = sci_present;
705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733
	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);
734 735
	if (rx_sa->next_pn_halves.lower >= secy->replay_window)
		lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
736 737 738 739

	/* Now perform replay protection check again
	 * (see IEEE 802.1AE-2006 figure 10-5)
	 */
740 741
	if (secy->replay_protect && pn < lowest_pn &&
	    (!secy->xpn || pn_same_half(pn, lowest_pn))) {
742 743 744 745
		spin_unlock(&rx_sa->lock);
		u64_stats_update_begin(&rxsc_stats->syncp);
		rxsc_stats->stats.InPktsLate++;
		u64_stats_update_end(&rxsc_stats->syncp);
746
		secy->netdev->stats.rx_dropped++;
747 748 749 750
		return false;
	}

	if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
751
		unsigned int msdu_len = macsec_msdu_len(skb);
752 753
		u64_stats_update_begin(&rxsc_stats->syncp);
		if (hdr->tci_an & MACSEC_TCI_E)
754
			rxsc_stats->stats.InOctetsDecrypted += msdu_len;
755
		else
756
			rxsc_stats->stats.InOctetsValidated += msdu_len;
757 758 759 760 761 762 763 764 765 766 767 768
		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);
769 770
			this_cpu_inc(rx_sa->stats->InPktsNotValid);
			secy->netdev->stats.rx_errors++;
771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793
			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);

794 795 796 797 798 799 800 801 802
		// 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;
		}

803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821
		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)
{
822
	skb->ip_summed = CHECKSUM_NONE;
823 824 825 826 827 828 829 830 831 832
	memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
	skb_pull(skb, hdr_len);
	pskb_trim_unique(skb, skb->len - icv_len);
}

static void count_rx(struct net_device *dev, int len)
{
	struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);

	u64_stats_update_begin(&stats->syncp);
833 834
	u64_stats_inc(&stats->rx_packets);
	u64_stats_add(&stats->rx_bytes, len);
835 836 837 838 839 840 841 842 843
	u64_stats_update_end(&stats->syncp);
}

static void macsec_decrypt_done(struct crypto_async_request *base, int err)
{
	struct sk_buff *skb = base->data;
	struct net_device *dev = skb->dev;
	struct macsec_dev *macsec = macsec_priv(dev);
	struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
844
	struct macsec_rx_sc *rx_sc = rx_sa->sc;
845
	int len;
846 847 848 849
	u32 pn;

	aead_request_free(macsec_skb_cb(skb)->req);

850 851 852
	if (!err)
		macsec_skb_cb(skb)->valid = true;

853 854 855 856 857 858 859 860 861 862
	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));
863
	len = skb->len;
864 865
	macsec_reset_skb(skb, macsec->secy.netdev);

866
	if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
867 868 869 870 871 872
		count_rx(dev, len);

	rcu_read_unlock_bh();

out:
	macsec_rxsa_put(rx_sa);
873
	macsec_rxsc_put(rx_sc);
874 875 876 877 878 879 880 881 882 883
	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;
884
	struct scatterlist *sg;
885
	struct sk_buff *trailer;
886
	unsigned char *iv;
887 888
	struct aead_request *req;
	struct macsec_eth_header *hdr;
889
	u32 hdr_pn;
890 891 892 893 894
	u16 icv_len = secy->icv_len;

	macsec_skb_cb(skb)->valid = false;
	skb = skb_share_check(skb, GFP_ATOMIC);
	if (!skb)
895
		return ERR_PTR(-ENOMEM);
896

897 898 899 900 901 902
	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);
903 904
	if (!req) {
		kfree_skb(skb);
905
		return ERR_PTR(-ENOMEM);
906 907 908
	}

	hdr = (struct macsec_eth_header *)skb->data;
909 910 911 912 913 914 915 916 917 918 919 920 921 922 923
	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);
	}
924

925
	sg_init_table(sg, ret);
926 927
	ret = skb_to_sgvec(skb, sg, 0, skb->len);
	if (unlikely(ret < 0)) {
928
		aead_request_free(req);
929 930 931
		kfree_skb(skb);
		return ERR_PTR(ret);
	}
932 933 934 935 936 937 938 939 940 941 942 943

	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);
944
			return ERR_PTR(-ENOMEM);
945 946 947 948 949 950 951 952 953 954 955 956 957 958
		}
	} 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) {
959
		return ERR_PTR(ret);
960 961 962 963 964 965
	} else if (ret != 0) {
		/* decryption/authentication failed
		 * 10.6 if validateFrames is disabled, deliver anyway
		 */
		if (ret != -EBADMSG) {
			kfree_skb(skb);
966
			skb = ERR_PTR(ret);
967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001
		}
	} 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;
}

1002
static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
1003
{
1004 1005
	/* Deliver to the uncontrolled port by default */
	enum rx_handler_result ret = RX_HANDLER_PASS;
1006
	struct ethhdr *hdr = eth_hdr(skb);
1007
	struct metadata_dst *md_dst;
1008 1009 1010 1011 1012
	struct macsec_rxh_data *rxd;
	struct macsec_dev *macsec;

	rcu_read_lock();
	rxd = macsec_data_rcu(skb->dev);
1013
	md_dst = skb_metadata_dst(skb);
1014 1015 1016 1017

	list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
		struct sk_buff *nskb;
		struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1018 1019 1020 1021 1022 1023
		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)) {
1024 1025 1026 1027
			if (md_dst && md_dst->type == METADATA_MACSEC &&
			    (!find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci)))
				continue;

1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048
			if (ether_addr_equal_64bits(hdr->h_dest,
						    ndev->dev_addr)) {
				/* exact match, divert skb to this port */
				skb->dev = ndev;
				skb->pkt_type = PACKET_HOST;
				ret = RX_HANDLER_ANOTHER;
				goto out;
			} else if (is_multicast_ether_addr_64bits(
					   hdr->h_dest)) {
				/* multicast frame, deliver on this port too */
				nskb = skb_clone(skb, GFP_ATOMIC);
				if (!nskb)
					break;

				nskb->dev = ndev;
				if (ether_addr_equal_64bits(hdr->h_dest,
							    ndev->broadcast))
					nskb->pkt_type = PACKET_BROADCAST;
				else
					nskb->pkt_type = PACKET_MULTICAST;

1049
				__netif_rx(nskb);
1050 1051 1052
			}
			continue;
		}
1053

1054 1055 1056 1057 1058
		/* 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) {
1059 1060 1061
			u64_stats_update_begin(&secy_stats->syncp);
			secy_stats->stats.InPktsNoTag++;
			u64_stats_update_end(&secy_stats->syncp);
1062
			macsec->secy.netdev->stats.rx_dropped++;
1063 1064 1065 1066 1067 1068 1069 1070
			continue;
		}

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

1071
		nskb->dev = ndev;
1072

1073
		if (__netif_rx(nskb) == NET_RX_SUCCESS) {
1074 1075 1076 1077 1078 1079
			u64_stats_update_begin(&secy_stats->syncp);
			secy_stats->stats.InPktsUntagged++;
			u64_stats_update_end(&secy_stats->syncp);
		}
	}

1080
out:
1081
	rcu_read_unlock();
1082
	return ret;
1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094
}

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;
1095
	unsigned int len;
1096
	sci_t sci;
1097
	u32 hdr_pn;
1098 1099 1100 1101
	bool cbit;
	struct pcpu_rx_sc_stats *rxsc_stats;
	struct pcpu_secy_stats *secy_stats;
	bool pulled_sci;
1102
	int ret;
1103 1104 1105 1106 1107

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

	hdr = macsec_ethhdr(skb);
1108 1109
	if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
		return handle_not_macsec(skb);
1110 1111

	skb = skb_unshare(skb, GFP_ATOMIC);
1112 1113
	*pskb = skb;
	if (!skb)
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149
		return RX_HANDLER_CONSUMED;

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

	hdr = macsec_ethhdr(skb);

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

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

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

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

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

	list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
		struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1150

1151
		sc = sc ? macsec_rxsc_get(sc) : NULL;
1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167

		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);

1168
	if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1169 1170 1171
		u64_stats_update_begin(&secy_stats->syncp);
		secy_stats->stats.InPktsBadTag++;
		u64_stats_update_end(&secy_stats->syncp);
1172
		secy->netdev->stats.rx_errors++;
1173 1174 1175 1176 1177 1178 1179 1180 1181 1182
		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
		 */
1183
		struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc);
1184 1185 1186 1187 1188
		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);
1189 1190 1191
			secy->netdev->stats.rx_errors++;
			if (active_rx_sa)
				this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA);
1192 1193 1194 1195 1196 1197 1198 1199 1200
			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);
1201 1202
		if (active_rx_sa)
			this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA);
1203 1204 1205 1206
		goto deliver;
	}

	/* First, PN check to avoid decrypting obviously wrong packets */
1207
	hdr_pn = ntohl(hdr->packet_number);
1208 1209 1210 1211
	if (secy->replay_protect) {
		bool late;

		spin_lock(&rx_sa->lock);
1212 1213 1214 1215 1216
		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);
1217 1218 1219 1220 1221 1222
		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);
1223
			macsec->secy.netdev->stats.rx_dropped++;
1224 1225 1226 1227
			goto drop;
		}
	}

1228 1229
	macsec_skb_cb(skb)->rx_sa = rx_sa;

1230 1231 1232 1233 1234
	/* 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);

1235 1236
	if (IS_ERR(skb)) {
		/* the decrypt callback needs the reference */
1237
		if (PTR_ERR(skb) != -EINPROGRESS) {
1238
			macsec_rxsa_put(rx_sa);
1239 1240
			macsec_rxsc_put(rx_sc);
		}
1241 1242 1243 1244 1245
		rcu_read_unlock();
		*pskb = NULL;
		return RX_HANDLER_CONSUMED;
	}

1246
	if (!macsec_post_decrypt(skb, secy, hdr_pn))
1247 1248 1249 1250 1251
		goto drop;

deliver:
	macsec_finalize_skb(skb, secy->icv_len,
			    macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1252
	len = skb->len;
1253 1254
	macsec_reset_skb(skb, secy->netdev);

S
Sabrina Dubroca 已提交
1255 1256
	if (rx_sa)
		macsec_rxsa_put(rx_sa);
1257
	macsec_rxsc_put(rx_sc);
1258

1259
	skb_orphan(skb);
1260 1261
	ret = gro_cells_receive(&macsec->gro_cells, skb);
	if (ret == NET_RX_SUCCESS)
1262
		count_rx(dev, len);
1263 1264
	else
		macsec->secy.netdev->stats.rx_dropped++;
1265 1266 1267

	rcu_read_unlock();

1268 1269
	*pskb = NULL;
	return RX_HANDLER_CONSUMED;
1270 1271 1272 1273

drop:
	macsec_rxsa_put(rx_sa);
drop_nosa:
1274
	macsec_rxsc_put(rx_sc);
1275 1276 1277 1278 1279 1280 1281 1282 1283 1284
	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)
1285
		macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
				    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);
1301
			macsec->secy.netdev->stats.rx_errors++;
1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313
			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);

1314
		ret = __netif_rx(nskb);
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333
		if (ret == NET_RX_SUCCESS) {
			u64_stats_update_begin(&secy_stats->syncp);
			secy_stats->stats.InPktsUnknownSCI++;
			u64_stats_update_end(&secy_stats->syncp);
		} else {
			macsec->secy.netdev->stats.rx_dropped++;
		}
	}

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

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

1334 1335
	/* Pick a sync gcm(aes) cipher to ensure order is preserved. */
	tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1336 1337 1338

	if (IS_ERR(tfm))
		return tfm;
1339 1340

	ret = crypto_aead_setkey(tfm, key, key_len);
1341 1342
	if (ret < 0)
		goto fail;
1343 1344

	ret = crypto_aead_setauthsize(tfm, icv_len);
1345 1346
	if (ret < 0)
		goto fail;
1347 1348

	return tfm;
1349 1350 1351
fail:
	crypto_free_aead(tfm);
	return ERR_PTR(ret);
1352 1353 1354 1355 1356 1357 1358
}

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)
1359
		return -ENOMEM;
1360 1361

	rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1362
	if (IS_ERR(rx_sa->key.tfm)) {
1363
		free_percpu(rx_sa->stats);
1364
		return PTR_ERR(rx_sa->key.tfm);
1365 1366
	}

1367
	rx_sa->ssci = MACSEC_UNDEF_SSCI;
1368 1369
	rx_sa->active = false;
	rx_sa->next_pn = 1;
1370
	refcount_set(&rx_sa->refcnt, 1);
1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440
	spin_lock_init(&rx_sa->lock);

	return 0;
}

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

	macsec_rxsa_put(rx_sa);
}

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

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

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

	macsec_rxsc_put(rx_sc);
}

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

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

	return NULL;
}

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

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

	rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
	if (!rx_sc)
		return ERR_PTR(-ENOMEM);

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

	rx_sc->sci = sci;
	rx_sc->active = true;
1441
	refcount_set(&rx_sc->refcnt, 1);
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457

	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)
1458
		return -ENOMEM;
1459 1460

	tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1461
	if (IS_ERR(tx_sa->key.tfm)) {
1462
		free_percpu(tx_sa->stats);
1463
		return PTR_ERR(tx_sa->key.tfm);
1464 1465
	}

1466
	tx_sa->ssci = MACSEC_UNDEF_SSCI;
1467
	tx_sa->active = false;
1468
	refcount_set(&tx_sa->refcnt, 1);
1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480
	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);
}

1481
static struct genl_family macsec_fam;
1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498

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;
}

1499 1500 1501 1502 1503
static enum macsec_offload nla_get_offload(const struct nlattr *nla)
{
	return (__force enum macsec_offload)nla_get_u8(nla);
}

1504 1505 1506 1507 1508
static sci_t nla_get_sci(const struct nlattr *nla)
{
	return (__force sci_t)nla_get_u64(nla);
}

1509 1510
static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
		       int padattr)
1511
{
1512
	return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1513 1514
}

1515 1516 1517 1518 1519 1520 1521 1522 1523 1524
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);
}

1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628
static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
					     struct nlattr **attrs,
					     struct nlattr **tb_sa,
					     struct net_device **devp,
					     struct macsec_secy **secyp,
					     struct macsec_tx_sc **scp,
					     u8 *assoc_num)
{
	struct net_device *dev;
	struct macsec_secy *secy;
	struct macsec_tx_sc *tx_sc;
	struct macsec_tx_sa *tx_sa;

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

	*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);

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

	if (*assoc_num >= MACSEC_NUM_AN)
		return ERR_PTR(-EINVAL);

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

	tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
	if (!tx_sa)
		return ERR_PTR(-ENODEV);

	*devp = dev;
	*scp = tx_sc;
	*secyp = secy;
	return tx_sa;
}

static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
					     struct nlattr **attrs,
					     struct nlattr **tb_rxsc,
					     struct net_device **devp,
					     struct macsec_secy **secyp)
{
	struct net_device *dev;
	struct macsec_secy *secy;
	struct macsec_rx_sc *rx_sc;
	sci_t sci;

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

	secy = &macsec_priv(dev)->secy;

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

	sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
	rx_sc = find_rx_sc_rtnl(secy, sci);
	if (!rx_sc)
		return ERR_PTR(-ENODEV);

	*secyp = secy;
	*devp = dev;

	return rx_sc;
}

static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
					     struct nlattr **attrs,
					     struct nlattr **tb_rxsc,
					     struct nlattr **tb_sa,
					     struct net_device **devp,
					     struct macsec_secy **secyp,
					     struct macsec_rx_sc **scp,
					     u8 *assoc_num)
{
	struct macsec_rx_sc *rx_sc;
	struct macsec_rx_sa *rx_sa;

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

	*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
	if (*assoc_num >= MACSEC_NUM_AN)
		return ERR_PTR(-EINVAL);

	rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
	if (IS_ERR(rx_sc))
		return ERR_CAST(rx_sc);

	rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
	if (!rx_sa)
		return ERR_PTR(-ENODEV);

	*scp = rx_sc;
	return rx_sa;
}

static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
	[MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
	[MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
	[MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1629
	[MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1630 1631 1632 1633 1634 1635 1636 1637 1638 1639
};

static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
	[MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
	[MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
};

static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
	[MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
	[MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1640
	[MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1641 1642
	[MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
				   .len = MACSEC_KEYID_LEN, },
1643
	[MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1644
				 .len = MACSEC_MAX_KEY_LEN, },
1645 1646 1647
	[MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
	[MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
				  .len = MACSEC_SALT_LEN, },
1648 1649
};

1650 1651 1652 1653
static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
	[MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
};

1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687
/* Offloads an operation to a device driver */
static int macsec_offload(int (* const func)(struct macsec_context *),
			  struct macsec_context *ctx)
{
	int ret;

	if (unlikely(!func))
		return 0;

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

	/* Phase I: prepare. The drive should fail here if there are going to be
	 * issues in the commit phase.
	 */
	ctx->prepare = true;
	ret = (*func)(ctx);
	if (ret)
		goto phy_unlock;

	/* Phase II: commit. This step cannot fail. */
	ctx->prepare = false;
	ret = (*func)(ctx);
	/* This should never happen: commit is not allowed to fail */
	if (unlikely(ret))
		WARN(1, "MACsec offloading commit failed (%d)\n", ret);

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

	return ret;
}

1688 1689 1690 1691 1692
static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
{
	if (!attrs[MACSEC_ATTR_SA_CONFIG])
		return -EINVAL;

1693
	if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1694 1695 1696 1697 1698 1699 1700 1701 1702 1703
		return -EINVAL;

	return 0;
}

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

1704
	if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719
		return -EINVAL;

	return 0;
}

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

	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
		return false;

1720
	if (attrs[MACSEC_SA_ATTR_PN] &&
1721
	    nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1722 1723 1724 1725 1726 1727 1728
		return false;

	if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
		if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
			return false;
	}

1729 1730 1731
	if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
		return false;

1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742
	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;
1743
	int pn_len;
1744 1745
	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1746
	int err;
1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761

	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);
1762
	if (IS_ERR(rx_sc)) {
1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775
		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;
	}

1776
	pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1777 1778
	if (tb_sa[MACSEC_SA_ATTR_PN] &&
	    nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793
		pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
			  nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
		rtnl_unlock();
		return -EINVAL;
	}

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

		if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
			pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
				  nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1794
				  MACSEC_SALT_LEN);
1795 1796 1797 1798 1799
			rtnl_unlock();
			return -EINVAL;
		}
	}

1800 1801 1802 1803 1804 1805 1806
	rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
	if (rx_sa) {
		rtnl_unlock();
		return -EBUSY;
	}

	rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1807
	if (!rx_sa) {
1808 1809 1810 1811
		rtnl_unlock();
		return -ENOMEM;
	}

1812 1813 1814 1815 1816 1817 1818 1819
	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;
	}

1820 1821
	if (tb_sa[MACSEC_SA_ATTR_PN]) {
		spin_lock_bh(&rx_sa->lock);
1822
		rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1823 1824 1825 1826 1827 1828 1829
		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;
1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843

	/* 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;
1844
		ctx.secy = secy;
1845
		memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1846
		       secy->key_len);
1847 1848 1849 1850 1851 1852

		err = macsec_offload(ops->mdo_add_rxsa, &ctx);
		if (err)
			goto cleanup;
	}

1853 1854 1855 1856 1857 1858
	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);
	}

1859
	nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1860 1861 1862 1863 1864
	rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);

	rtnl_unlock();

	return 0;
1865 1866

cleanup:
1867
	macsec_rxsa_put(rx_sa);
1868 1869
	rtnl_unlock();
	return err;
1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891
}

static bool validate_add_rxsc(struct nlattr **attrs)
{
	if (!attrs[MACSEC_RXSC_ATTR_SCI])
		return false;

	if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
		if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
			return false;
	}

	return true;
}

static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
{
	struct net_device *dev;
	sci_t sci = MACSEC_UNDEF_SCI;
	struct nlattr **attrs = info->attrs;
	struct macsec_rx_sc *rx_sc;
	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1892
	struct macsec_secy *secy;
1893 1894
	bool was_active;
	int ret;
1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911

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

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

	if (!validate_add_rxsc(tb_rxsc))
		return -EINVAL;

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

1912
	secy = &macsec_priv(dev)->secy;
1913 1914 1915 1916 1917 1918 1919 1920
	sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);

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

1921
	was_active = rx_sc->active;
1922 1923 1924
	if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
		rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);

1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935
	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;
1936
		ctx.secy = secy;
1937 1938 1939 1940 1941 1942

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

1943 1944 1945
	rtnl_unlock();

	return 0;
1946 1947 1948 1949 1950

cleanup:
	rx_sc->active = was_active;
	rtnl_unlock();
	return ret;
1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963
}

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

	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
		return false;

1964
	if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1965 1966 1967 1968 1969 1970 1971
		return false;

	if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
		if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
			return false;
	}

1972 1973 1974
	if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
		return false;

1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985
	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;
1986
	int pn_len;
1987
	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1988
	bool was_operational;
1989
	int err;
1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018

	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;
	}

2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035
	pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
	if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
		pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
			  nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
		rtnl_unlock();
		return -EINVAL;
	}

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

		if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
			pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
				  nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2036
				  MACSEC_SALT_LEN);
2037 2038 2039 2040 2041
			rtnl_unlock();
			return -EINVAL;
		}
	}

2042 2043 2044 2045 2046 2047 2048
	tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
	if (tx_sa) {
		rtnl_unlock();
		return -EBUSY;
	}

	tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2049
	if (!tx_sa) {
2050 2051 2052 2053
		rtnl_unlock();
		return -ENOMEM;
	}

2054 2055 2056 2057 2058 2059 2060 2061
	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;
	}

2062
	spin_lock_bh(&tx_sa->lock);
2063
	tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2064 2065 2066 2067 2068
	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]);

2069
	was_operational = secy->operational;
2070 2071 2072
	if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
		secy->operational = true;

2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085
	/* 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;
2086
		ctx.secy = secy;
2087
		memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2088
		       secy->key_len);
2089 2090 2091 2092 2093 2094

		err = macsec_offload(ops->mdo_add_txsa, &ctx);
		if (err)
			goto cleanup;
	}

2095 2096 2097 2098 2099 2100
	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);
	}

2101
	nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2102 2103 2104 2105 2106
	rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);

	rtnl_unlock();

	return 0;
2107 2108 2109

cleanup:
	secy->operational = was_operational;
2110
	macsec_txsa_put(tx_sa);
2111 2112
	rtnl_unlock();
	return err;
2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124
}

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];
2125
	int ret;
2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148

	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;
	}

2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161
	/* 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;
2162
		ctx.secy = secy;
2163 2164 2165 2166 2167 2168

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

2169 2170 2171 2172 2173 2174
	RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
	clear_rx_sa(rx_sa);

	rtnl_unlock();

	return 0;
2175 2176 2177 2178

cleanup:
	rtnl_unlock();
	return ret;
2179 2180 2181 2182 2183 2184 2185 2186 2187 2188
}

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];
2189
	int ret;
2190 2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215

	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;
	}

2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227
	/* 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;
2228
		ctx.secy = secy;
2229 2230 2231 2232 2233
		ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
		if (ret)
			goto cleanup;
	}

2234 2235 2236 2237
	free_rx_sc(rx_sc);
	rtnl_unlock();

	return 0;
2238 2239 2240 2241

cleanup:
	rtnl_unlock();
	return ret;
2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252
}

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];
2253
	int ret;
2254 2255 2256 2257 2258 2259 2260 2261 2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273

	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;
	}

2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286
	/* 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;
2287
		ctx.secy = secy;
2288 2289 2290 2291 2292 2293

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

2294 2295 2296 2297 2298 2299
	RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
	clear_tx_sa(tx_sa);

	rtnl_unlock();

	return 0;
2300 2301 2302 2303

cleanup:
	rtnl_unlock();
	return ret;
2304 2305 2306 2307 2308 2309
}

static bool validate_upd_sa(struct nlattr **attrs)
{
	if (!attrs[MACSEC_SA_ATTR_AN] ||
	    attrs[MACSEC_SA_ATTR_KEY] ||
2310 2311 2312
	    attrs[MACSEC_SA_ATTR_KEYID] ||
	    attrs[MACSEC_SA_ATTR_SSCI] ||
	    attrs[MACSEC_SA_ATTR_SALT])
2313 2314 2315 2316 2317
		return false;

	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
		return false;

2318
	if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337
		return false;

	if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
		if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
			return false;
	}

	return true;
}

static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr **attrs = info->attrs;
	struct net_device *dev;
	struct macsec_secy *secy;
	struct macsec_tx_sc *tx_sc;
	struct macsec_tx_sa *tx_sa;
	u8 assoc_num;
	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2338
	bool was_operational, was_active;
2339
	pn_t prev_pn;
2340
	int ret = 0;
2341

2342 2343
	prev_pn.full64 = 0;

2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361
	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]) {
2362 2363 2364 2365 2366 2367 2368 2369 2370 2371
		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;
		}

2372
		spin_lock_bh(&tx_sa->lock);
2373
		prev_pn = tx_sa->next_pn_halves;
2374
		tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2375 2376 2377
		spin_unlock_bh(&tx_sa->lock);
	}

2378
	was_active = tx_sa->active;
2379 2380 2381
	if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
		tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);

2382
	was_operational = secy->operational;
2383 2384 2385
	if (assoc_num == tx_sc->encoding_sa)
		secy->operational = tx_sa->active;

2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398
	/* 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;
2399
		ctx.secy = secy;
2400 2401 2402 2403 2404 2405

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

2406 2407 2408
	rtnl_unlock();

	return 0;
2409 2410 2411 2412

cleanup:
	if (tb_sa[MACSEC_SA_ATTR_PN]) {
		spin_lock_bh(&tx_sa->lock);
2413
		tx_sa->next_pn_halves = prev_pn;
2414 2415 2416 2417 2418 2419
		spin_unlock_bh(&tx_sa->lock);
	}
	tx_sa->active = was_active;
	secy->operational = was_operational;
	rtnl_unlock();
	return ret;
2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431
}

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];
2432
	bool was_active;
2433
	pn_t prev_pn;
2434
	int ret = 0;
2435

2436 2437
	prev_pn.full64 = 0;

2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458
	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]) {
2459 2460 2461 2462 2463 2464 2465 2466 2467 2468
		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;
		}

2469
		spin_lock_bh(&rx_sa->lock);
2470
		prev_pn = rx_sa->next_pn_halves;
2471
		rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2472 2473 2474
		spin_unlock_bh(&rx_sa->lock);
	}

2475
	was_active = rx_sa->active;
2476 2477 2478
	if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
		rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);

2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491
	/* 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;
2492
		ctx.secy = secy;
2493 2494 2495 2496 2497 2498

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

2499 2500
	rtnl_unlock();
	return 0;
2501 2502 2503 2504

cleanup:
	if (tb_sa[MACSEC_SA_ATTR_PN]) {
		spin_lock_bh(&rx_sa->lock);
2505
		rx_sa->next_pn_halves = prev_pn;
2506 2507 2508 2509 2510
		spin_unlock_bh(&rx_sa->lock);
	}
	rx_sa->active = was_active;
	rtnl_unlock();
	return ret;
2511 2512 2513 2514 2515 2516 2517 2518 2519
}

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];
2520 2521 2522
	unsigned int prev_n_rx_sc;
	bool was_active;
	int ret;
2523 2524 2525 2526 2527 2528 2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 2539

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

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

	if (!validate_add_rxsc(tb_rxsc))
		return -EINVAL;

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

2540 2541
	was_active = rx_sc->active;
	prev_n_rx_sc = secy->n_rx_sc;
2542 2543 2544 2545 2546 2547 2548 2549 2550
	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;
	}

2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562
	/* 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;
2563
		ctx.secy = secy;
2564 2565 2566 2567 2568 2569

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

2570 2571 2572
	rtnl_unlock();

	return 0;
2573 2574 2575 2576 2577 2578

cleanup:
	secy->n_rx_sc = prev_n_rx_sc;
	rx_sc->active = was_active;
	rtnl_unlock();
	return ret;
2579 2580
}

2581 2582 2583 2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602
static bool macsec_is_configured(struct macsec_dev *macsec)
{
	struct macsec_secy *secy = &macsec->secy;
	struct macsec_tx_sc *tx_sc = &secy->tx_sc;
	int i;

	if (secy->n_rx_sc > 0)
		return true;

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

	return false;
}

static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
{
	struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
	enum macsec_offload offload, prev_offload;
	int (*func)(struct macsec_context *ctx);
	struct nlattr **attrs = info->attrs;
2603
	struct net_device *dev;
2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624
	const struct macsec_ops *ops;
	struct macsec_context ctx;
	struct macsec_dev *macsec;
	int ret;

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

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

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

	dev = get_dev_from_nl(genl_info_net(info), attrs);
	if (IS_ERR(dev))
		return PTR_ERR(dev);
	macsec = macsec_priv(dev);

2625 2626 2627
	if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
		return -EINVAL;

2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670
	offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
	if (macsec->offload == offload)
		return 0;

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

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

	rtnl_lock();

	prev_offload = macsec->offload;
	macsec->offload = offload;

	/* Check if the device already has rules configured: we do not support
	 * rules migration.
	 */
	if (macsec_is_configured(macsec)) {
		ret = -EBUSY;
		goto rollback;
	}

	ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
			       macsec, &ctx);
	if (!ops) {
		ret = -EOPNOTSUPP;
		goto rollback;
	}

	if (prev_offload == MACSEC_OFFLOAD_OFF)
		func = ops->mdo_add_secy;
	else
		func = ops->mdo_del_secy;

	ctx.secy = &macsec->secy;
	ret = macsec_offload(func, &ctx);
	if (ret)
		goto rollback;

2671 2672 2673 2674
	/* Force features update, since they are different for SW MACSec and
	 * HW offloading cases.
	 */
	netdev_update_features(dev);
2675 2676

	rtnl_unlock();
2677 2678 2679 2680 2681 2682 2683 2684 2685
	return 0;

rollback:
	macsec->offload = prev_offload;

	rtnl_unlock();
	return ret;
}

2686 2687 2688
static void get_tx_sa_stats(struct net_device *dev, int an,
			    struct macsec_tx_sa *tx_sa,
			    struct macsec_tx_sa_stats *sum)
2689
{
2690
	struct macsec_dev *macsec = macsec_priv(dev);
2691 2692
	int cpu;

2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705 2706 2707 2708
	/* 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;
	}

2709
	for_each_possible_cpu(cpu) {
2710 2711
		const struct macsec_tx_sa_stats *stats =
			per_cpu_ptr(tx_sa->stats, cpu);
2712

2713 2714
		sum->OutPktsProtected += stats->OutPktsProtected;
		sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2715
	}
2716
}
2717

2718 2719 2720 2721 2722 2723
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))
2724 2725 2726 2727 2728
		return -EMSGSIZE;

	return 0;
}

2729 2730 2731 2732
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)
2733
{
2734
	struct macsec_dev *macsec = macsec_priv(dev);
2735 2736
	int cpu;

2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753
	/* 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;
	}

2754
	for_each_possible_cpu(cpu) {
2755 2756
		const struct macsec_rx_sa_stats *stats =
			per_cpu_ptr(rx_sa->stats, cpu);
2757

2758 2759 2760 2761 2762
		sum->InPktsOK         += stats->InPktsOK;
		sum->InPktsInvalid    += stats->InPktsInvalid;
		sum->InPktsNotValid   += stats->InPktsNotValid;
		sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
		sum->InPktsUnusedSA   += stats->InPktsUnusedSA;
2763
	}
2764
}
2765

2766 2767 2768 2769 2770 2771 2772 2773 2774 2775 2776 2777
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))
2778 2779 2780 2781 2782
		return -EMSGSIZE;

	return 0;
}

2783 2784 2785
static void get_rx_sc_stats(struct net_device *dev,
			    struct macsec_rx_sc *rx_sc,
			    struct macsec_rx_sc_stats *sum)
2786
{
2787
	struct macsec_dev *macsec = macsec_priv(dev);
2788 2789
	int cpu;

2790 2791 2792 2793 2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804
	/* 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;
	}

2805 2806 2807 2808 2809
	for_each_possible_cpu(cpu) {
		const struct pcpu_rx_sc_stats *stats;
		struct macsec_rx_sc_stats tmp;
		unsigned int start;

2810
		stats = per_cpu_ptr(rx_sc->stats, cpu);
2811 2812 2813 2814 2815
		do {
			start = u64_stats_fetch_begin_irq(&stats->syncp);
			memcpy(&tmp, &stats->stats, sizeof(tmp));
		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));

2816 2817 2818 2819 2820 2821 2822 2823 2824 2825
		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;
2826
	}
2827
}
2828

2829 2830
static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
{
2831
	if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2832
			      sum->InOctetsValidated,
2833 2834
			      MACSEC_RXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2835
			      sum->InOctetsDecrypted,
2836 2837
			      MACSEC_RXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2838
			      sum->InPktsUnchecked,
2839 2840
			      MACSEC_RXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2841
			      sum->InPktsDelayed,
2842 2843
			      MACSEC_RXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2844
			      sum->InPktsOK,
2845 2846
			      MACSEC_RXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2847
			      sum->InPktsInvalid,
2848 2849
			      MACSEC_RXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2850
			      sum->InPktsLate,
2851 2852
			      MACSEC_RXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2853
			      sum->InPktsNotValid,
2854 2855
			      MACSEC_RXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2856
			      sum->InPktsNotUsingSA,
2857 2858
			      MACSEC_RXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2859
			      sum->InPktsUnusedSA,
2860
			      MACSEC_RXSC_STATS_ATTR_PAD))
2861 2862 2863 2864 2865
		return -EMSGSIZE;

	return 0;
}

2866 2867
static void get_tx_sc_stats(struct net_device *dev,
			    struct macsec_tx_sc_stats *sum)
2868
{
2869
	struct macsec_dev *macsec = macsec_priv(dev);
2870 2871
	int cpu;

2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885
	/* 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;
	}

2886 2887 2888 2889 2890
	for_each_possible_cpu(cpu) {
		const struct pcpu_tx_sc_stats *stats;
		struct macsec_tx_sc_stats tmp;
		unsigned int start;

2891
		stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2892 2893 2894 2895 2896
		do {
			start = u64_stats_fetch_begin_irq(&stats->syncp);
			memcpy(&tmp, &stats->stats, sizeof(tmp));
		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));

2897 2898 2899 2900
		sum->OutPktsProtected   += tmp.OutPktsProtected;
		sum->OutPktsEncrypted   += tmp.OutPktsEncrypted;
		sum->OutOctetsProtected += tmp.OutOctetsProtected;
		sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2901
	}
2902
}
2903

2904 2905
static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
{
2906
	if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2907
			      sum->OutPktsProtected,
2908 2909
			      MACSEC_TXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2910
			      sum->OutPktsEncrypted,
2911 2912
			      MACSEC_TXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2913
			      sum->OutOctetsProtected,
2914 2915
			      MACSEC_TXSC_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2916
			      sum->OutOctetsEncrypted,
2917
			      MACSEC_TXSC_STATS_ATTR_PAD))
2918 2919 2920 2921 2922
		return -EMSGSIZE;

	return 0;
}

2923
static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2924
{
2925
	struct macsec_dev *macsec = macsec_priv(dev);
2926 2927
	int cpu;

2928 2929 2930 2931 2932 2933 2934 2935 2936 2937 2938 2939 2940 2941
	/* 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;
	}

2942 2943 2944 2945 2946
	for_each_possible_cpu(cpu) {
		const struct pcpu_secy_stats *stats;
		struct macsec_dev_stats tmp;
		unsigned int start;

2947
		stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2948 2949 2950 2951 2952
		do {
			start = u64_stats_fetch_begin_irq(&stats->syncp);
			memcpy(&tmp, &stats->stats, sizeof(tmp));
		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));

2953 2954 2955 2956 2957 2958 2959 2960
		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;
2961
	}
2962
}
2963

2964 2965
static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
{
2966
	if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2967
			      sum->OutPktsUntagged,
2968 2969
			      MACSEC_SECY_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2970
			      sum->InPktsUntagged,
2971 2972
			      MACSEC_SECY_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2973
			      sum->OutPktsTooLong,
2974 2975
			      MACSEC_SECY_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2976
			      sum->InPktsNoTag,
2977 2978
			      MACSEC_SECY_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2979
			      sum->InPktsBadTag,
2980 2981
			      MACSEC_SECY_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2982
			      sum->InPktsUnknownSCI,
2983 2984
			      MACSEC_SECY_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2985
			      sum->InPktsNoSCI,
2986 2987
			      MACSEC_SECY_STATS_ATTR_PAD) ||
	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2988
			      sum->InPktsOverrun,
2989
			      MACSEC_SECY_STATS_ATTR_PAD))
2990 2991 2992 2993 2994 2995 2996 2997
		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;
2998 2999
	struct nlattr *secy_nest = nla_nest_start_noflag(skb,
							 MACSEC_ATTR_SECY);
3000
	u64 csid;
3001 3002 3003 3004

	if (!secy_nest)
		return 1;

3005 3006
	switch (secy->key_len) {
	case MACSEC_GCM_AES_128_SAK_LEN:
3007
		csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
3008 3009
		break;
	case MACSEC_GCM_AES_256_SAK_LEN:
3010
		csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
3011 3012 3013 3014 3015
		break;
	default:
		goto cancel;
	}

3016 3017 3018
	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,
3019
			      csid, MACSEC_SECY_ATTR_PAD) ||
3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044
	    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;
}

3045 3046 3047
static noinline_for_stack int
dump_secy(struct macsec_secy *secy, struct net_device *dev,
	  struct sk_buff *skb, struct netlink_callback *cb)
3048
{
3049 3050 3051 3052
	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, };
3053
	struct macsec_dev *macsec = netdev_priv(dev);
3054
	struct macsec_dev_stats dev_stats = {0, };
3055 3056
	struct macsec_tx_sc *tx_sc = &secy->tx_sc;
	struct nlattr *txsa_list, *rxsc_list;
3057
	struct macsec_rx_sc *rx_sc;
3058
	struct nlattr *attr;
3059 3060
	void *hdr;
	int i, j;
3061 3062 3063 3064 3065 3066

	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;

M
Michal Kubecek 已提交
3067
	genl_dump_check_consistent(cb, hdr);
3068 3069 3070 3071

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

3072 3073 3074 3075 3076 3077 3078
	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);

3079 3080 3081
	if (nla_put_secy(secy, skb))
		goto nla_put_failure;

3082
	attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3083 3084
	if (!attr)
		goto nla_put_failure;
3085 3086 3087

	get_tx_sc_stats(dev, &tx_sc_stats);
	if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3088 3089 3090 3091 3092
		nla_nest_cancel(skb, attr);
		goto nla_put_failure;
	}
	nla_nest_end(skb, attr);

3093
	attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3094 3095
	if (!attr)
		goto nla_put_failure;
3096 3097
	get_secy_stats(dev, &dev_stats);
	if (copy_secy_stats(skb, &dev_stats)) {
3098 3099 3100 3101 3102
		nla_nest_cancel(skb, attr);
		goto nla_put_failure;
	}
	nla_nest_end(skb, attr);

3103
	txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3104 3105 3106 3107 3108
	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;
3109 3110
		u64 pn;
		int pn_len;
3111 3112 3113 3114

		if (!tx_sa)
			continue;

3115
		txsa_nest = nla_nest_start_noflag(skb, j++);
3116 3117 3118 3119 3120
		if (!txsa_nest) {
			nla_nest_cancel(skb, txsa_list);
			goto nla_put_failure;
		}

3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136
		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);

3137 3138 3139 3140 3141 3142 3143 3144
		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;
		}

3145
		if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3146
		    nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3147
		    nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3148
		    (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3149 3150 3151 3152 3153 3154 3155 3156 3157 3158
		    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);

3159
	rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3160 3161 3162 3163 3164 3165 3166
	if (!rxsc_list)
		goto nla_put_failure;

	j = 1;
	for_each_rxsc_rtnl(secy, rx_sc) {
		int k;
		struct nlattr *rxsa_list;
3167
		struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3168 3169 3170 3171 3172 3173 3174

		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) ||
3175 3176
		    nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
				MACSEC_RXSC_ATTR_PAD)) {
3177 3178 3179 3180 3181
			nla_nest_cancel(skb, rxsc_nest);
			nla_nest_cancel(skb, rxsc_list);
			goto nla_put_failure;
		}

3182
		attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3183 3184 3185 3186 3187
		if (!attr) {
			nla_nest_cancel(skb, rxsc_nest);
			nla_nest_cancel(skb, rxsc_list);
			goto nla_put_failure;
		}
3188 3189 3190
		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)) {
3191 3192 3193 3194 3195 3196 3197
			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);

3198 3199
		rxsa_list = nla_nest_start_noflag(skb,
						  MACSEC_RXSC_ATTR_SA_LIST);
3200 3201 3202 3203 3204 3205 3206 3207 3208
		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;
3209 3210
			u64 pn;
			int pn_len;
3211 3212 3213 3214

			if (!rx_sa)
				continue;

3215
			rxsa_nest = nla_nest_start_noflag(skb, k++);
3216 3217 3218 3219 3220 3221 3222
			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;
			}

3223 3224
			attr = nla_nest_start_noflag(skb,
						     MACSEC_SA_ATTR_STATS);
3225 3226 3227 3228 3229 3230
			if (!attr) {
				nla_nest_cancel(skb, rxsa_list);
				nla_nest_cancel(skb, rxsc_nest);
				nla_nest_cancel(skb, rxsc_list);
				goto nla_put_failure;
			}
3231 3232 3233
			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)) {
3234 3235 3236 3237 3238 3239 3240 3241
				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);

3242 3243 3244 3245 3246 3247 3248 3249
			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;
			}

3250
			if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3251
			    nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3252
			    nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3253
			    (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3254 3255 3256 3257 3258 3259 3260 3261 3262 3263 3264 3265 3266 3267 3268 3269 3270 3271 3272 3273 3274 3275 3276 3277
			    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;
}

3278 3279
static int macsec_generation = 1; /* protected by RTNL */

3280 3281 3282 3283 3284 3285 3286 3287 3288
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;
3289
	rtnl_lock();
3290 3291 3292

	cb->seq = macsec_generation;

3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309
	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:
3310
	rtnl_unlock();
3311 3312 3313 3314
	cb->args[0] = d;
	return skb->len;
}

3315
static const struct genl_small_ops macsec_genl_ops[] = {
3316 3317
	{
		.cmd = MACSEC_CMD_GET_TXSC,
3318
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3319 3320 3321 3322
		.dumpit = macsec_dump_txsc,
	},
	{
		.cmd = MACSEC_CMD_ADD_RXSC,
3323
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3324 3325 3326 3327 3328
		.doit = macsec_add_rxsc,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = MACSEC_CMD_DEL_RXSC,
3329
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3330 3331 3332 3333 3334
		.doit = macsec_del_rxsc,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = MACSEC_CMD_UPD_RXSC,
3335
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3336 3337 3338 3339 3340
		.doit = macsec_upd_rxsc,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = MACSEC_CMD_ADD_TXSA,
3341
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3342 3343 3344 3345 3346
		.doit = macsec_add_txsa,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = MACSEC_CMD_DEL_TXSA,
3347
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3348 3349 3350 3351 3352
		.doit = macsec_del_txsa,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = MACSEC_CMD_UPD_TXSA,
3353
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3354 3355 3356 3357 3358
		.doit = macsec_upd_txsa,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = MACSEC_CMD_ADD_RXSA,
3359
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3360 3361 3362 3363 3364
		.doit = macsec_add_rxsa,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = MACSEC_CMD_DEL_RXSA,
3365
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3366 3367 3368 3369 3370
		.doit = macsec_del_rxsa,
		.flags = GENL_ADMIN_PERM,
	},
	{
		.cmd = MACSEC_CMD_UPD_RXSA,
3371
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3372 3373 3374
		.doit = macsec_upd_rxsa,
		.flags = GENL_ADMIN_PERM,
	},
3375 3376 3377 3378 3379 3380
	{
		.cmd = MACSEC_CMD_UPD_OFFLOAD,
		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
		.doit = macsec_upd_offload,
		.flags = GENL_ADMIN_PERM,
	},
3381 3382
};

3383
static struct genl_family macsec_fam __ro_after_init = {
3384 3385 3386 3387
	.name		= MACSEC_GENL_NAME,
	.hdrsize	= 0,
	.version	= MACSEC_GENL_VERSION,
	.maxattr	= MACSEC_ATTR_MAX,
3388
	.policy = macsec_genl_policy,
3389 3390
	.netnsok	= true,
	.module		= THIS_MODULE,
3391 3392
	.small_ops	= macsec_genl_ops,
	.n_small_ops	= ARRAY_SIZE(macsec_genl_ops),
3393
	.resv_start_op	= MACSEC_CMD_UPD_OFFLOAD + 1,
3394 3395
};

3396 3397 3398 3399 3400 3401 3402 3403
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;

3404
	if (macsec_is_offloaded(netdev_priv(dev))) {
3405 3406 3407 3408 3409
		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);
3410 3411 3412 3413
		skb->dev = macsec->real_dev;
		return dev_queue_xmit(skb);
	}

3414 3415 3416 3417 3418 3419
	/* 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);
3420
		skb->dev = macsec->real_dev;
3421 3422 3423 3424 3425 3426 3427 3428 3429 3430 3431 3432
		len = skb->len;
		ret = dev_queue_xmit(skb);
		count_tx(dev, ret, len);
		return ret;
	}

	if (!secy->operational) {
		kfree_skb(skb);
		dev->stats.tx_dropped++;
		return NETDEV_TX_OK;
	}

3433
	len = skb->len;
3434 3435 3436 3437 3438 3439 3440 3441 3442 3443 3444 3445 3446 3447 3448
	skb = macsec_encrypt(skb, dev);
	if (IS_ERR(skb)) {
		if (PTR_ERR(skb) != -EINPROGRESS)
			dev->stats.tx_dropped++;
		return NETDEV_TX_OK;
	}

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

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

3449
#define SW_MACSEC_FEATURES \
3450
	(NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3451

3452 3453 3454 3455 3456 3457 3458
/* If h/w offloading is enabled, use real device features save for
 *   VLAN_FEATURES - they require additional ops
 *   HW_MACSEC - no reason to report it
 */
#define REAL_DEV_FEATURES(dev) \
	((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC))

3459 3460 3461 3462
static int macsec_dev_init(struct net_device *dev)
{
	struct macsec_dev *macsec = macsec_priv(dev);
	struct net_device *real_dev = macsec->real_dev;
3463
	int err;
3464 3465 3466 3467 3468

	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
	if (!dev->tstats)
		return -ENOMEM;

3469 3470 3471 3472 3473 3474
	err = gro_cells_init(&macsec->gro_cells, dev);
	if (err) {
		free_percpu(dev->tstats);
		return err;
	}

3475 3476 3477 3478 3479 3480
	if (macsec_is_offloaded(macsec)) {
		dev->features = REAL_DEV_FEATURES(real_dev);
	} else {
		dev->features = real_dev->features & SW_MACSEC_FEATURES;
		dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
	}
3481 3482 3483 3484 3485 3486 3487 3488 3489 3490 3491

	dev->needed_headroom = real_dev->needed_headroom +
			       MACSEC_NEEDED_HEADROOM;
	dev->needed_tailroom = real_dev->needed_tailroom +
			       MACSEC_NEEDED_TAILROOM;

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

Z
Ziyang Xuan 已提交
3492
	/* Get macsec's reference to real_dev */
3493
	netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
Z
Ziyang Xuan 已提交
3494

3495 3496 3497 3498 3499
	return 0;
}

static void macsec_dev_uninit(struct net_device *dev)
{
3500 3501 3502
	struct macsec_dev *macsec = macsec_priv(dev);

	gro_cells_destroy(&macsec->gro_cells);
3503 3504 3505 3506 3507 3508 3509 3510 3511
	free_percpu(dev->tstats);
}

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

3512 3513 3514 3515
	if (macsec_is_offloaded(macsec))
		return REAL_DEV_FEATURES(real_dev);

	features &= (real_dev->features & SW_MACSEC_FEATURES) |
3516 3517
		    NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
	features |= NETIF_F_LLTX;
3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543

	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;
	}

3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554
	/* 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;
		}

3555
		ctx.secy = &macsec->secy;
3556 3557 3558 3559 3560
		err = macsec_offload(ops->mdo_dev_open, &ctx);
		if (err)
			goto clear_allmulti;
	}

3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575 3576 3577 3578 3579 3580
	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);

3581 3582 3583 3584 3585 3586
	/* 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);
3587 3588
		if (ops) {
			ctx.secy = &macsec->secy;
3589
			macsec_offload(ops->mdo_dev_stop, &ctx);
3590
		}
3591 3592
	}

3593 3594 3595 3596 3597 3598 3599 3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 3643 3644 3645 3646 3647 3648 3649
	dev_mc_unsync(real_dev, dev);
	dev_uc_unsync(real_dev, dev);

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

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

	dev_uc_del(real_dev, dev->dev_addr);

	return 0;
}

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

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

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

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

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

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

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

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

	if (!(dev->flags & IFF_UP))
		goto out;

	err = dev_uc_add(real_dev, addr->sa_data);
	if (err < 0)
		return err;

	dev_uc_del(real_dev, dev->dev_addr);

out:
3650
	eth_hw_addr_set(dev, addr->sa_data);
3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663

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

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

3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679
	return 0;
}

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

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

	dev->mtu = new_mtu;

	return 0;
}

3680 3681
static void macsec_get_stats64(struct net_device *dev,
			       struct rtnl_link_stats64 *s)
3682 3683
{
	if (!dev->tstats)
3684
		return;
3685

3686
	dev_fetch_sw_netstats(s, dev->tstats);
3687 3688 3689

	s->rx_dropped = dev->stats.rx_dropped;
	s->tx_dropped = dev->stats.tx_dropped;
3690
	s->rx_errors = dev->stats.rx_errors;
3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710 3711 3712 3713 3714 3715 3716 3717 3718
}

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

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

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

static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
	[IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3719
	[IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736
	[IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
	[IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
	[IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
	[IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
	[IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
	[IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
	[IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
	[IFLA_MACSEC_ES] = { .type = NLA_U8 },
	[IFLA_MACSEC_SCB] = { .type = NLA_U8 },
	[IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
	[IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
};

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

3737
	metadata_dst_free(macsec->secy.tx_sc.md_dst);
3738 3739 3740
	free_percpu(macsec->stats);
	free_percpu(macsec->secy.tx_sc.stats);

Z
Ziyang Xuan 已提交
3741
	/* Get rid of the macsec's reference to real_dev */
3742
	netdev_put(macsec->real_dev, &macsec->dev_tracker);
3743 3744 3745 3746 3747
}

static void macsec_setup(struct net_device *dev)
{
	ether_setup(dev);
3748 3749
	dev->min_mtu = 0;
	dev->max_mtu = ETH_MAX_MTU;
3750
	dev->priv_flags |= IFF_NO_QUEUE;
3751
	dev->netdev_ops = &macsec_netdev_ops;
3752 3753
	dev->needs_free_netdev = true;
	dev->priv_destructor = macsec_free_netdev;
S
stephen hemminger 已提交
3754
	SET_NETDEV_DEVTYPE(dev, &macsec_type);
3755 3756 3757 3758

	eth_zero_addr(dev->broadcast);
}

3759 3760
static int macsec_changelink_common(struct net_device *dev,
				    struct nlattr *data[])
3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791 3792 3793 3794 3795 3796
{
	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]);
3797 3798 3799 3800

	if (data[IFLA_MACSEC_CIPHER_SUITE]) {
		switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
		case MACSEC_CIPHER_ID_GCM_AES_128:
3801
		case MACSEC_DEFAULT_CIPHER_ID:
3802
			secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3803
			secy->xpn = false;
3804 3805 3806
			break;
		case MACSEC_CIPHER_ID_GCM_AES_256:
			secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3807 3808 3809 3810 3811 3812 3813 3814 3815
			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;
3816 3817 3818 3819 3820 3821
			break;
		default:
			return -EINVAL;
		}
	}

3822 3823 3824 3825 3826 3827 3828 3829 3830 3831
	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;
	}

3832
	return 0;
3833 3834 3835
}

static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3836 3837
			     struct nlattr *data[],
			     struct netlink_ext_ack *extack)
3838
{
3839
	struct macsec_dev *macsec = macsec_priv(dev);
3840
	struct macsec_tx_sc tx_sc;
3841 3842 3843
	struct macsec_secy secy;
	int ret;

3844 3845 3846 3847 3848 3849 3850 3851 3852
	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;

3853 3854 3855 3856 3857 3858 3859 3860
	/* 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)
3861
		goto cleanup;
3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885 3886 3887

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

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

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

	return 0;

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

	return ret;
3888 3889 3890 3891 3892 3893 3894 3895 3896 3897 3898 3899 3900 3901 3902 3903 3904 3905 3906 3907 3908 3909 3910
}

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);
		}
	}
}

3911 3912 3913
static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
{
	struct macsec_dev *macsec = macsec_priv(dev);
3914
	struct net_device *real_dev = macsec->real_dev;
3915

3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927
	/* 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);
		}
	}

3928 3929 3930
	unregister_netdevice_queue(dev, head);
	list_del_rcu(&macsec->secys);
	macsec_del_dev(macsec);
3931
	netdev_upper_dev_unlink(real_dev, dev);
3932 3933 3934 3935

	macsec_generation++;
}

3936 3937 3938 3939 3940 3941
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);

3942
	macsec_common_dellink(dev, head);
3943

3944
	if (list_empty(&rxd->secys)) {
3945
		netdev_rx_handler_unregister(real_dev);
3946 3947
		kfree(rxd);
	}
3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961 3962 3963 3964 3965 3966
}

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

	if (!rxd) {
		int err;

		rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
		if (!rxd)
			return -ENOMEM;

		INIT_LIST_HEAD(&rxd->secys);

		err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
						 rxd);
3967 3968
		if (err < 0) {
			kfree(rxd);
3969
			return err;
3970
		}
3971 3972 3973 3974 3975 3976 3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987 3988 3989
	}

	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;
}

3990 3991 3992 3993 3994
static sci_t dev_to_sci(struct net_device *dev, __be16 port)
{
	return make_sci(dev->dev_addr, port);
}

3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009
static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
{
	struct macsec_dev *macsec = macsec_priv(dev);
	struct macsec_secy *secy = &macsec->secy;

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

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

4010 4011 4012 4013 4014 4015 4016
	secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
	if (!secy->tx_sc.md_dst) {
		free_percpu(secy->tx_sc.stats);
		free_percpu(macsec->stats);
		return -ENOMEM;
	}

4017 4018 4019 4020 4021 4022 4023 4024 4025 4026
	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;
4027
	secy->xpn = DEFAULT_XPN;
4028 4029

	secy->sci = sci;
4030
	secy->tx_sc.md_dst->u.macsec_info.sci = sci;
4031 4032 4033 4034 4035 4036 4037 4038 4039 4040
	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;
}

4041 4042
static struct lock_class_key macsec_netdev_addr_lock_key;

4043
static int macsec_newlink(struct net *net, struct net_device *dev,
4044 4045
			  struct nlattr *tb[], struct nlattr *data[],
			  struct netlink_ext_ack *extack)
4046 4047
{
	struct macsec_dev *macsec = macsec_priv(dev);
T
Taehee Yoo 已提交
4048
	rx_handler_func_t *rx_handler;
4049
	u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4050
	struct net_device *real_dev;
T
Taehee Yoo 已提交
4051
	int err, mtu;
4052 4053 4054 4055 4056 4057 4058
	sci_t sci;

	if (!tb[IFLA_LINK])
		return -EINVAL;
	real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
	if (!real_dev)
		return -ENODEV;
4059 4060
	if (real_dev->type != ARPHRD_ETHER)
		return -EINVAL;
4061 4062 4063 4064 4065

	dev->priv_flags |= IFF_MACSEC;

	macsec->real_dev = real_dev;

4066 4067 4068 4069 4070 4071 4072 4073 4074 4075
	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;
4076

4077 4078 4079 4080 4081 4082 4083 4084 4085
	/* 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;
	}

4086 4087
	if (data && data[IFLA_MACSEC_ICV_LEN])
		icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
T
Taehee Yoo 已提交
4088 4089 4090 4091 4092
	mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
	if (mtu < 0)
		dev->mtu = 0;
	else
		dev->mtu = mtu;
4093 4094 4095 4096 4097 4098 4099 4100 4101

	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;

4102
	netdev_lockdep_set_classes(dev);
4103 4104
	lockdep_set_class(&dev->addr_list_lock,
			  &macsec_netdev_addr_lock_key);
4105

4106
	err = netdev_upper_dev_link(real_dev, dev, extack);
4107
	if (err < 0)
4108
		goto unregister;
4109

4110 4111 4112 4113 4114 4115 4116 4117 4118 4119 4120 4121
	/* 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;
4122
		goto unlink;
4123 4124 4125 4126
	}

	err = macsec_add_dev(dev, sci, icv_len);
	if (err)
4127
		goto unlink;
4128

4129 4130 4131 4132 4133
	if (data) {
		err = macsec_changelink_common(dev, data);
		if (err)
			goto del_dev;
	}
4134

4135 4136 4137 4138 4139 4140 4141 4142 4143 4144 4145 4146 4147 4148
	/* 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;
		}
	}

4149 4150 4151 4152
	err = register_macsec_dev(real_dev, dev);
	if (err < 0)
		goto del_dev;

4153 4154 4155
	netif_stacked_transfer_operstate(real_dev, dev);
	linkwatch_fire_event(dev);

4156 4157
	macsec_generation++;

4158 4159 4160 4161
	return 0;

del_dev:
	macsec_del_dev(macsec);
4162 4163
unlink:
	netdev_upper_dev_unlink(real_dev, dev);
4164
unregister:
4165 4166 4167 4168
	unregister_netdevice(dev);
	return err;
}

4169 4170
static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
				struct netlink_ext_ack *extack)
4171
{
4172
	u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4173
	u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4174 4175 4176 4177 4178 4179 4180 4181 4182
	int flag;
	bool es, scb, sci;

	if (!data)
		return 0;

	if (data[IFLA_MACSEC_CIPHER_SUITE])
		csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);

4183
	if (data[IFLA_MACSEC_ICV_LEN]) {
4184
		icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4185
		if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196
			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);
		}
	}
4197 4198

	switch (csid) {
4199 4200
	case MACSEC_CIPHER_ID_GCM_AES_128:
	case MACSEC_CIPHER_ID_GCM_AES_256:
4201 4202
	case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
	case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4203
	case MACSEC_DEFAULT_CIPHER_ID:
4204
		if (icv_len < MACSEC_MIN_ICV_LEN ||
4205
		    icv_len > MACSEC_STD_ICV_LEN)
4206 4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234 4235 4236
			return -EINVAL;
		break;
	default:
		return -EINVAL;
	}

	if (data[IFLA_MACSEC_ENCODING_SA]) {
		if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
			return -EINVAL;
	}

	for (flag = IFLA_MACSEC_ENCODING_SA + 1;
	     flag < IFLA_MACSEC_VALIDATION;
	     flag++) {
		if (data[flag]) {
			if (nla_get_u8(data[flag]) > 1)
				return -EINVAL;
		}
	}

	es  = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
	sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
	scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;

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

	if (data[IFLA_MACSEC_VALIDATION] &&
	    nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
		return -EINVAL;

4237 4238
	if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
	     nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4239 4240 4241 4242 4243 4244 4245 4246 4247 4248 4249 4250 4251
	    !data[IFLA_MACSEC_WINDOW])
		return -EINVAL;

	return 0;
}

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

static size_t macsec_get_size(const struct net_device *dev)
{
4252 4253 4254 4255 4256 4257 4258 4259 4260 4261 4262 4263
	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 */
4264 4265 4266 4267 4268 4269 4270 4271
		0;
}

static int macsec_fill_info(struct sk_buff *skb,
			    const struct net_device *dev)
{
	struct macsec_secy *secy = &macsec_priv(dev)->secy;
	struct macsec_tx_sc *tx_sc = &secy->tx_sc;
4272 4273 4274 4275
	u64 csid;

	switch (secy->key_len) {
	case MACSEC_GCM_AES_128_SAK_LEN:
4276
		csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4277 4278
		break;
	case MACSEC_GCM_AES_256_SAK_LEN:
4279
		csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4280 4281 4282 4283
		break;
	default:
		goto nla_put_failure;
	}
4284

4285 4286
	if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
			IFLA_MACSEC_PAD) ||
4287
	    nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4288
	    nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4289
			      csid, IFLA_MACSEC_PAD) ||
4290 4291 4292 4293 4294 4295 4296 4297 4298 4299 4300 4301 4302 4303 4304 4305 4306 4307 4308 4309 4310 4311 4312 4313 4314 4315 4316 4317 4318 4319 4320 4321 4322 4323 4324 4325 4326 4327 4328 4329 4330 4331 4332 4333 4334 4335 4336 4337 4338 4339 4340 4341
	    nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
	    nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
	    nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
	    nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
	    nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
	    nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
	    nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
	    nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
	    0)
		goto nla_put_failure;

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

	return 0;

nla_put_failure:
	return -EMSGSIZE;
}

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

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

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

	if (!is_macsec_master(real_dev))
		return NOTIFY_DONE;

	switch (event) {
4342 4343 4344 4345 4346 4347 4348 4349 4350 4351 4352 4353 4354 4355
	case NETDEV_DOWN:
	case NETDEV_UP:
	case NETDEV_CHANGE: {
		struct macsec_dev *m, *n;
		struct macsec_rxh_data *rxd;

		rxd = macsec_data_rtnl(real_dev);
		list_for_each_entry_safe(m, n, &rxd->secys, secys) {
			struct net_device *dev = m->secy.netdev;

			netif_stacked_transfer_operstate(real_dev, dev);
		}
		break;
	}
4356 4357 4358 4359 4360 4361
	case NETDEV_UNREGISTER: {
		struct macsec_dev *m, *n;
		struct macsec_rxh_data *rxd;

		rxd = macsec_data_rtnl(real_dev);
		list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4362
			macsec_common_dellink(m->secy.netdev, &head);
4363
		}
4364 4365 4366 4367

		netdev_rx_handler_unregister(real_dev);
		kfree(rxd);

4368 4369 4370 4371 4372 4373 4374 4375 4376 4377 4378 4379 4380 4381 4382 4383 4384 4385 4386 4387 4388 4389 4390 4391 4392 4393 4394 4395 4396 4397 4398 4399 4400 4401 4402 4403 4404 4405 4406
		unregister_netdevice_many(&head);
		break;
	}
	case NETDEV_CHANGEMTU: {
		struct macsec_dev *m;
		struct macsec_rxh_data *rxd;

		rxd = macsec_data_rtnl(real_dev);
		list_for_each_entry(m, &rxd->secys, secys) {
			struct net_device *dev = m->secy.netdev;
			unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
							    macsec_extra_len(true));

			if (dev->mtu > mtu)
				dev_set_mtu(dev, mtu);
		}
	}
	}

	return NOTIFY_OK;
}

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

static int __init macsec_init(void)
{
	int err;

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

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

4407
	err = genl_register_family(&macsec_fam);
4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424
	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);
4425
	rcu_barrier();
4426 4427 4428 4429 4430 4431
}

module_init(macsec_init);
module_exit(macsec_exit);

MODULE_ALIAS_RTNL_LINK("macsec");
4432
MODULE_ALIAS_GENL_FAMILY("macsec");
4433 4434 4435

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