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linux-next/drivers/net/macsec.c
Cong Wang 845e0ebb44 net: change addr_list_lock back to static key 
The dynamic key update for addr_list_lock still causes troubles,
for example the following race condition still exists:

CPU 0:				CPU 1:
(RCU read lock)			(RTNL lock)
dev_mc_seq_show()		netdev_update_lockdep_key()
				  -> lockdep_unregister_key()
 -> netif_addr_lock_bh()

because lockdep doesn't provide an API to update it atomically.
Therefore, we have to move it back to static keys and use subclass
for nest locking like before.

In commit 1a33e10e4a ("net: partially revert dynamic lockdep key
changes"), I already reverted most parts of commit ab92d68fc2
("net: core: add generic lockdep keys").

This patch reverts the rest and also part of commit f3b0a18bb6
("net: remove unnecessary variables and callback"). After this
patch, addr_list_lock changes back to using static keys and
subclasses to satisfy lockdep. Thanks to dev->lower_level, we do
not have to change back to ->ndo_get_lock_subclass().

And hopefully this reduces some syzbot lockdep noises too.

Reported-by: syzbot+f3a0e80c34b3fc28ac5e@syzkaller.appspotmail.com
Cc: Taehee Yoo <ap420073@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-06-09 12:59:45 -07:00

4389 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* drivers/net/macsec.c - MACsec device
*
* Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
*/
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/socket.h>
#include <linux/module.h>
#include <crypto/aead.h>
#include <linux/etherdevice.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/refcount.h>
#include <net/genetlink.h>
#include <net/sock.h>
#include <net/gro_cells.h>
#include <net/macsec.h>
#include <linux/phy.h>
#include <linux/byteorder/generic.h>
#include <linux/if_arp.h>
#include <uapi/linux/if_macsec.h>
#define MACSEC_SCI_LEN 8
/* SecTAG length = macsec_eth_header without the optional SCI */
#define MACSEC_TAG_LEN 6
struct macsec_eth_header {
struct ethhdr eth;
/* SecTAG */
u8 tci_an;
#if defined(__LITTLE_ENDIAN_BITFIELD)
u8 short_length:6,
unused:2;
#elif defined(__BIG_ENDIAN_BITFIELD)
u8 unused:2,
short_length:6;
#else
#error "Please fix <asm/byteorder.h>"
#endif
__be32 packet_number;
u8 secure_channel_id[8]; /* optional */
} __packed;
#define MACSEC_TCI_VERSION 0x80
#define MACSEC_TCI_ES 0x40 /* end station */
#define MACSEC_TCI_SC 0x20 /* SCI present */
#define MACSEC_TCI_SCB 0x10 /* epon */
#define MACSEC_TCI_E 0x08 /* encryption */
#define MACSEC_TCI_C 0x04 /* changed text */
#define MACSEC_AN_MASK 0x03 /* association number */
#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
#define MIN_NON_SHORT_LEN 48
#define GCM_AES_IV_LEN 12
#define DEFAULT_ICV_LEN 16
#define for_each_rxsc(secy, sc) \
for (sc = rcu_dereference_bh(secy->rx_sc); \
sc; \
sc = rcu_dereference_bh(sc->next))
#define for_each_rxsc_rtnl(secy, sc) \
for (sc = rtnl_dereference(secy->rx_sc); \
sc; \
sc = rtnl_dereference(sc->next))
#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
struct gcm_iv_xpn {
union {
u8 short_secure_channel_id[4];
ssci_t ssci;
};
__be64 pn;
} __packed;
struct gcm_iv {
union {
u8 secure_channel_id[8];
sci_t sci;
};
__be32 pn;
};
#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
struct pcpu_secy_stats {
struct macsec_dev_stats stats;
struct u64_stats_sync syncp;
};
/**
* struct macsec_dev - private data
* @secy: SecY config
* @real_dev: pointer to underlying netdevice
* @stats: MACsec device stats
* @secys: linked list of SecY's on the underlying device
* @offload: status of offloading on the MACsec device
*/
struct macsec_dev {
struct macsec_secy secy;
struct net_device *real_dev;
struct pcpu_secy_stats __percpu *stats;
struct list_head secys;
struct gro_cells gro_cells;
enum macsec_offload offload;
};
/**
* struct macsec_rxh_data - rx_handler private argument
* @secys: linked list of SecY's on this underlying device
*/
struct macsec_rxh_data {
struct list_head secys;
};
static struct macsec_dev *macsec_priv(const struct net_device *dev)
{
return (struct macsec_dev *)netdev_priv(dev);
}
static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
{
return rcu_dereference_bh(dev->rx_handler_data);
}
static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
{
return rtnl_dereference(dev->rx_handler_data);
}
struct macsec_cb {
struct aead_request *req;
union {
struct macsec_tx_sa *tx_sa;
struct macsec_rx_sa *rx_sa;
};
u8 assoc_num;
bool valid;
bool has_sci;
};
static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
{
struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
if (!sa || !sa->active)
return NULL;
if (!refcount_inc_not_zero(&sa->refcnt))
return NULL;
return sa;
}
static void free_rx_sc_rcu(struct rcu_head *head)
{
struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
free_percpu(rx_sc->stats);
kfree(rx_sc);
}
static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
{
return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
}
static void macsec_rxsc_put(struct macsec_rx_sc *sc)
{
if (refcount_dec_and_test(&sc->refcnt))
call_rcu(&sc->rcu_head, free_rx_sc_rcu);
}
static void free_rxsa(struct rcu_head *head)
{
struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
crypto_free_aead(sa->key.tfm);
free_percpu(sa->stats);
kfree(sa);
}
static void macsec_rxsa_put(struct macsec_rx_sa *sa)
{
if (refcount_dec_and_test(&sa->refcnt))
call_rcu(&sa->rcu, free_rxsa);
}
static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
{
struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
if (!sa || !sa->active)
return NULL;
if (!refcount_inc_not_zero(&sa->refcnt))
return NULL;
return sa;
}
static void free_txsa(struct rcu_head *head)
{
struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
crypto_free_aead(sa->key.tfm);
free_percpu(sa->stats);
kfree(sa);
}
static void macsec_txsa_put(struct macsec_tx_sa *sa)
{
if (refcount_dec_and_test(&sa->refcnt))
call_rcu(&sa->rcu, free_txsa);
}
static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
{
BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
return (struct macsec_cb *)skb->cb;
}
#define MACSEC_PORT_ES (htons(0x0001))
#define MACSEC_PORT_SCB (0x0000)
#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
#define MACSEC_GCM_AES_128_SAK_LEN 16
#define MACSEC_GCM_AES_256_SAK_LEN 32
#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
#define DEFAULT_XPN false
#define DEFAULT_SEND_SCI true
#define DEFAULT_ENCRYPT false
#define DEFAULT_ENCODING_SA 0
static bool send_sci(const struct macsec_secy *secy)
{
const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
return tx_sc->send_sci ||
(secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
}
static sci_t make_sci(u8 *addr, __be16 port)
{
sci_t sci;
memcpy(&sci, addr, ETH_ALEN);
memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
return sci;
}
static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
{
sci_t sci;
if (sci_present)
memcpy(&sci, hdr->secure_channel_id,
sizeof(hdr->secure_channel_id));
else
sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
return sci;
}
static unsigned int macsec_sectag_len(bool sci_present)
{
return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
}
static unsigned int macsec_hdr_len(bool sci_present)
{
return macsec_sectag_len(sci_present) + ETH_HLEN;
}
static unsigned int macsec_extra_len(bool sci_present)
{
return macsec_sectag_len(sci_present) + sizeof(__be16);
}
/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
static void macsec_fill_sectag(struct macsec_eth_header *h,
const struct macsec_secy *secy, u32 pn,
bool sci_present)
{
const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
h->eth.h_proto = htons(ETH_P_MACSEC);
if (sci_present) {
h->tci_an |= MACSEC_TCI_SC;
memcpy(&h->secure_channel_id, &secy->sci,
sizeof(h->secure_channel_id));
} else {
if (tx_sc->end_station)
h->tci_an |= MACSEC_TCI_ES;
if (tx_sc->scb)
h->tci_an |= MACSEC_TCI_SCB;
}
h->packet_number = htonl(pn);
/* with GCM, C/E clear for !encrypt, both set for encrypt */
if (tx_sc->encrypt)
h->tci_an |= MACSEC_TCI_CONFID;
else if (secy->icv_len != DEFAULT_ICV_LEN)
h->tci_an |= MACSEC_TCI_C;
h->tci_an |= tx_sc->encoding_sa;
}
static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
{
if (data_len < MIN_NON_SHORT_LEN)
h->short_length = data_len;
}
/* Checks if a MACsec interface is being offloaded to an hardware engine */
static bool macsec_is_offloaded(struct macsec_dev *macsec)
{
if (macsec->offload == MACSEC_OFFLOAD_MAC ||
macsec->offload == MACSEC_OFFLOAD_PHY)
return true;
return false;
}
/* Checks if underlying layers implement MACsec offloading functions. */
static bool macsec_check_offload(enum macsec_offload offload,
struct macsec_dev *macsec)
{
if (!macsec || !macsec->real_dev)
return false;
if (offload == MACSEC_OFFLOAD_PHY)
return macsec->real_dev->phydev &&
macsec->real_dev->phydev->macsec_ops;
else if (offload == MACSEC_OFFLOAD_MAC)
return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
macsec->real_dev->macsec_ops;
return false;
}
static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
struct macsec_dev *macsec,
struct macsec_context *ctx)
{
if (ctx) {
memset(ctx, 0, sizeof(*ctx));
ctx->offload = offload;
if (offload == MACSEC_OFFLOAD_PHY)
ctx->phydev = macsec->real_dev->phydev;
else if (offload == MACSEC_OFFLOAD_MAC)
ctx->netdev = macsec->real_dev;
}
if (offload == MACSEC_OFFLOAD_PHY)
return macsec->real_dev->phydev->macsec_ops;
else
return macsec->real_dev->macsec_ops;
}
/* Returns a pointer to the MACsec ops struct if any and updates the MACsec
* context device reference if provided.
*/
static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
struct macsec_context *ctx)
{
if (!macsec_check_offload(macsec->offload, macsec))
return NULL;
return __macsec_get_ops(macsec->offload, macsec, ctx);
}
/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
{
struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
int len = skb->len - 2 * ETH_ALEN;
int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
/* a) It comprises at least 17 octets */
if (skb->len <= 16)
return false;
/* b) MACsec EtherType: already checked */
/* c) V bit is clear */
if (h->tci_an & MACSEC_TCI_VERSION)
return false;
/* d) ES or SCB => !SC */
if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
(h->tci_an & MACSEC_TCI_SC))
return false;
/* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
if (h->unused)
return false;
/* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
if (!h->packet_number && !xpn)
return false;
/* length check, f) g) h) i) */
if (h->short_length)
return len == extra_len + h->short_length;
return len >= extra_len + MIN_NON_SHORT_LEN;
}
#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
salt_t salt)
{
struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
gcm_iv->ssci = ssci ^ salt.ssci;
gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
}
static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
{
struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
gcm_iv->sci = sci;
gcm_iv->pn = htonl(pn);
}
static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
{
return (struct macsec_eth_header *)skb_mac_header(skb);
}
static sci_t dev_to_sci(struct net_device *dev, __be16 port)
{
return make_sci(dev->dev_addr, port);
}
static void __macsec_pn_wrapped(struct macsec_secy *secy,
struct macsec_tx_sa *tx_sa)
{
pr_debug("PN wrapped, transitioning to !oper\n");
tx_sa->active = false;
if (secy->protect_frames)
secy->operational = false;
}
void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
{
spin_lock_bh(&tx_sa->lock);
__macsec_pn_wrapped(secy, tx_sa);
spin_unlock_bh(&tx_sa->lock);
}
EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
struct macsec_secy *secy)
{
pn_t pn;
spin_lock_bh(&tx_sa->lock);
pn = tx_sa->next_pn_halves;
if (secy->xpn)
tx_sa->next_pn++;
else
tx_sa->next_pn_halves.lower++;
if (tx_sa->next_pn == 0)
__macsec_pn_wrapped(secy, tx_sa);
spin_unlock_bh(&tx_sa->lock);
return pn;
}
static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
{
struct macsec_dev *macsec = netdev_priv(dev);
skb->dev = macsec->real_dev;
skb_reset_mac_header(skb);
skb->protocol = eth_hdr(skb)->h_proto;
}
static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
struct macsec_tx_sa *tx_sa)
{
struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
u64_stats_update_begin(&txsc_stats->syncp);
if (tx_sc->encrypt) {
txsc_stats->stats.OutOctetsEncrypted += skb->len;
txsc_stats->stats.OutPktsEncrypted++;
this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
} else {
txsc_stats->stats.OutOctetsProtected += skb->len;
txsc_stats->stats.OutPktsProtected++;
this_cpu_inc(tx_sa->stats->OutPktsProtected);
}
u64_stats_update_end(&txsc_stats->syncp);
}
static void count_tx(struct net_device *dev, int ret, int len)
{
if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
u64_stats_update_begin(&stats->syncp);
stats->tx_packets++;
stats->tx_bytes += len;
u64_stats_update_end(&stats->syncp);
}
}
static void macsec_encrypt_done(struct crypto_async_request *base, int err)
{
struct sk_buff *skb = base->data;
struct net_device *dev = skb->dev;
struct macsec_dev *macsec = macsec_priv(dev);
struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
int len, ret;
aead_request_free(macsec_skb_cb(skb)->req);
rcu_read_lock_bh();
macsec_encrypt_finish(skb, dev);
macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
len = skb->len;
ret = dev_queue_xmit(skb);
count_tx(dev, ret, len);
rcu_read_unlock_bh();
macsec_txsa_put(sa);
dev_put(dev);
}
static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
unsigned char **iv,
struct scatterlist **sg,
int num_frags)
{
size_t size, iv_offset, sg_offset;
struct aead_request *req;
void *tmp;
size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
iv_offset = size;
size += GCM_AES_IV_LEN;
size = ALIGN(size, __alignof__(struct scatterlist));
sg_offset = size;
size += sizeof(struct scatterlist) * num_frags;
tmp = kmalloc(size, GFP_ATOMIC);
if (!tmp)
return NULL;
*iv = (unsigned char *)(tmp + iv_offset);
*sg = (struct scatterlist *)(tmp + sg_offset);
req = tmp;
aead_request_set_tfm(req, tfm);
return req;
}
static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
struct net_device *dev)
{
int ret;
struct scatterlist *sg;
struct sk_buff *trailer;
unsigned char *iv;
struct ethhdr *eth;
struct macsec_eth_header *hh;
size_t unprotected_len;
struct aead_request *req;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
struct macsec_dev *macsec = macsec_priv(dev);
bool sci_present;
pn_t pn;
secy = &macsec->secy;
tx_sc = &secy->tx_sc;
/* 10.5.1 TX SA assignment */
tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
if (!tx_sa) {
secy->operational = false;
kfree_skb(skb);
return ERR_PTR(-EINVAL);
}
if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
struct sk_buff *nskb = skb_copy_expand(skb,
MACSEC_NEEDED_HEADROOM,
MACSEC_NEEDED_TAILROOM,
GFP_ATOMIC);
if (likely(nskb)) {
consume_skb(skb);
skb = nskb;
} else {
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-ENOMEM);
}
} else {
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb) {
macsec_txsa_put(tx_sa);
return ERR_PTR(-ENOMEM);
}
}
unprotected_len = skb->len;
eth = eth_hdr(skb);
sci_present = send_sci(secy);
hh = skb_push(skb, macsec_extra_len(sci_present));
memmove(hh, eth, 2 * ETH_ALEN);
pn = tx_sa_update_pn(tx_sa, secy);
if (pn.full64 == 0) {
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-ENOLINK);
}
macsec_fill_sectag(hh, secy, pn.lower, sci_present);
macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
skb_put(skb, secy->icv_len);
if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.OutPktsTooLong++;
u64_stats_update_end(&secy_stats->syncp);
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-EINVAL);
}
ret = skb_cow_data(skb, 0, &trailer);
if (unlikely(ret < 0)) {
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(ret);
}
req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
if (!req) {
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-ENOMEM);
}
if (secy->xpn)
macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
else
macsec_fill_iv(iv, secy->sci, pn.lower);
sg_init_table(sg, ret);
ret = skb_to_sgvec(skb, sg, 0, skb->len);
if (unlikely(ret < 0)) {
aead_request_free(req);
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(ret);
}
if (tx_sc->encrypt) {
int len = skb->len - macsec_hdr_len(sci_present) -
secy->icv_len;
aead_request_set_crypt(req, sg, sg, len, iv);
aead_request_set_ad(req, macsec_hdr_len(sci_present));
} else {
aead_request_set_crypt(req, sg, sg, 0, iv);
aead_request_set_ad(req, skb->len - secy->icv_len);
}
macsec_skb_cb(skb)->req = req;
macsec_skb_cb(skb)->tx_sa = tx_sa;
aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
dev_hold(skb->dev);
ret = crypto_aead_encrypt(req);
if (ret == -EINPROGRESS) {
return ERR_PTR(ret);
} else if (ret != 0) {
dev_put(skb->dev);
kfree_skb(skb);
aead_request_free(req);
macsec_txsa_put(tx_sa);
return ERR_PTR(-EINVAL);
}
dev_put(skb->dev);
aead_request_free(req);
macsec_txsa_put(tx_sa);
return skb;
}
static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
{
struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
struct macsec_eth_header *hdr = macsec_ethhdr(skb);
u32 lowest_pn = 0;
spin_lock(&rx_sa->lock);
if (rx_sa->next_pn_halves.lower >= secy->replay_window)
lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
/* Now perform replay protection check again
* (see IEEE 802.1AE-2006 figure 10-5)
*/
if (secy->replay_protect && pn < lowest_pn &&
(!secy->xpn || pn_same_half(pn, lowest_pn))) {
spin_unlock(&rx_sa->lock);
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsLate++;
u64_stats_update_end(&rxsc_stats->syncp);
return false;
}
if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
u64_stats_update_begin(&rxsc_stats->syncp);
if (hdr->tci_an & MACSEC_TCI_E)
rxsc_stats->stats.InOctetsDecrypted += skb->len;
else
rxsc_stats->stats.InOctetsValidated += skb->len;
u64_stats_update_end(&rxsc_stats->syncp);
}
if (!macsec_skb_cb(skb)->valid) {
spin_unlock(&rx_sa->lock);
/* 10.6.5 */
if (hdr->tci_an & MACSEC_TCI_C ||
secy->validate_frames == MACSEC_VALIDATE_STRICT) {
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsNotValid++;
u64_stats_update_end(&rxsc_stats->syncp);
return false;
}
u64_stats_update_begin(&rxsc_stats->syncp);
if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
rxsc_stats->stats.InPktsInvalid++;
this_cpu_inc(rx_sa->stats->InPktsInvalid);
} else if (pn < lowest_pn) {
rxsc_stats->stats.InPktsDelayed++;
} else {
rxsc_stats->stats.InPktsUnchecked++;
}
u64_stats_update_end(&rxsc_stats->syncp);
} else {
u64_stats_update_begin(&rxsc_stats->syncp);
if (pn < lowest_pn) {
rxsc_stats->stats.InPktsDelayed++;
} else {
rxsc_stats->stats.InPktsOK++;
this_cpu_inc(rx_sa->stats->InPktsOK);
}
u64_stats_update_end(&rxsc_stats->syncp);
// Instead of "pn >=" - to support pn overflow in xpn
if (pn + 1 > rx_sa->next_pn_halves.lower) {
rx_sa->next_pn_halves.lower = pn + 1;
} else if (secy->xpn &&
!pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
rx_sa->next_pn_halves.upper++;
rx_sa->next_pn_halves.lower = pn + 1;
}
spin_unlock(&rx_sa->lock);
}
return true;
}
static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
{
skb->pkt_type = PACKET_HOST;
skb->protocol = eth_type_trans(skb, dev);
skb_reset_network_header(skb);
if (!skb_transport_header_was_set(skb))
skb_reset_transport_header(skb);
skb_reset_mac_len(skb);
}
static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
{
skb->ip_summed = CHECKSUM_NONE;
memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
skb_pull(skb, hdr_len);
pskb_trim_unique(skb, skb->len - icv_len);
}
static void count_rx(struct net_device *dev, int len)
{
struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
u64_stats_update_begin(&stats->syncp);
stats->rx_packets++;
stats->rx_bytes += len;
u64_stats_update_end(&stats->syncp);
}
static void macsec_decrypt_done(struct crypto_async_request *base, int err)
{
struct sk_buff *skb = base->data;
struct net_device *dev = skb->dev;
struct macsec_dev *macsec = macsec_priv(dev);
struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
struct macsec_rx_sc *rx_sc = rx_sa->sc;
int len;
u32 pn;
aead_request_free(macsec_skb_cb(skb)->req);
if (!err)
macsec_skb_cb(skb)->valid = true;
rcu_read_lock_bh();
pn = ntohl(macsec_ethhdr(skb)->packet_number);
if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
rcu_read_unlock_bh();
kfree_skb(skb);
goto out;
}
macsec_finalize_skb(skb, macsec->secy.icv_len,
macsec_extra_len(macsec_skb_cb(skb)->has_sci));
macsec_reset_skb(skb, macsec->secy.netdev);
len = skb->len;
if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
count_rx(dev, len);
rcu_read_unlock_bh();
out:
macsec_rxsa_put(rx_sa);
macsec_rxsc_put(rx_sc);
dev_put(dev);
}
static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
struct net_device *dev,
struct macsec_rx_sa *rx_sa,
sci_t sci,
struct macsec_secy *secy)
{
int ret;
struct scatterlist *sg;
struct sk_buff *trailer;
unsigned char *iv;
struct aead_request *req;
struct macsec_eth_header *hdr;
u32 hdr_pn;
u16 icv_len = secy->icv_len;
macsec_skb_cb(skb)->valid = false;
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
ret = skb_cow_data(skb, 0, &trailer);
if (unlikely(ret < 0)) {
kfree_skb(skb);
return ERR_PTR(ret);
}
req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
if (!req) {
kfree_skb(skb);
return ERR_PTR(-ENOMEM);
}
hdr = (struct macsec_eth_header *)skb->data;
hdr_pn = ntohl(hdr->packet_number);
if (secy->xpn) {
pn_t recovered_pn = rx_sa->next_pn_halves;
recovered_pn.lower = hdr_pn;
if (hdr_pn < rx_sa->next_pn_halves.lower &&
!pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
recovered_pn.upper++;
macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
rx_sa->key.salt);
} else {
macsec_fill_iv(iv, sci, hdr_pn);
}
sg_init_table(sg, ret);
ret = skb_to_sgvec(skb, sg, 0, skb->len);
if (unlikely(ret < 0)) {
aead_request_free(req);
kfree_skb(skb);
return ERR_PTR(ret);
}
if (hdr->tci_an & MACSEC_TCI_E) {
/* confidentiality: ethernet + macsec header
* authenticated, encrypted payload
*/
int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
aead_request_set_crypt(req, sg, sg, len, iv);
aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb) {
aead_request_free(req);
return ERR_PTR(-ENOMEM);
}
} else {
/* integrity only: all headers + data authenticated */
aead_request_set_crypt(req, sg, sg, icv_len, iv);
aead_request_set_ad(req, skb->len - icv_len);
}
macsec_skb_cb(skb)->req = req;
skb->dev = dev;
aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
dev_hold(dev);
ret = crypto_aead_decrypt(req);
if (ret == -EINPROGRESS) {
return ERR_PTR(ret);
} else if (ret != 0) {
/* decryption/authentication failed
* 10.6 if validateFrames is disabled, deliver anyway
*/
if (ret != -EBADMSG) {
kfree_skb(skb);
skb = ERR_PTR(ret);
}
} else {
macsec_skb_cb(skb)->valid = true;
}
dev_put(dev);
aead_request_free(req);
return skb;
}
static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
{
struct macsec_rx_sc *rx_sc;
for_each_rxsc(secy, rx_sc) {
if (rx_sc->sci == sci)
return rx_sc;
}
return NULL;
}
static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
{
struct macsec_rx_sc *rx_sc;
for_each_rxsc_rtnl(secy, rx_sc) {
if (rx_sc->sci == sci)
return rx_sc;
}
return NULL;
}
static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
{
/* Deliver to the uncontrolled port by default */
enum rx_handler_result ret = RX_HANDLER_PASS;
struct ethhdr *hdr = eth_hdr(skb);
struct macsec_rxh_data *rxd;
struct macsec_dev *macsec;
rcu_read_lock();
rxd = macsec_data_rcu(skb->dev);
list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
struct sk_buff *nskb;
struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
struct net_device *ndev = macsec->secy.netdev;
/* If h/w offloading is enabled, HW decodes frames and strips
* the SecTAG, so we have to deduce which port to deliver to.
*/
if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
if (ether_addr_equal_64bits(hdr->h_dest,
ndev->dev_addr)) {
/* exact match, divert skb to this port */
skb->dev = ndev;
skb->pkt_type = PACKET_HOST;
ret = RX_HANDLER_ANOTHER;
goto out;
} else if (is_multicast_ether_addr_64bits(
hdr->h_dest)) {
/* multicast frame, deliver on this port too */
nskb = skb_clone(skb, GFP_ATOMIC);
if (!nskb)
break;
nskb->dev = ndev;
if (ether_addr_equal_64bits(hdr->h_dest,
ndev->broadcast))
nskb->pkt_type = PACKET_BROADCAST;
else
nskb->pkt_type = PACKET_MULTICAST;
netif_rx(nskb);
}
continue;
}
/* 10.6 If the management control validateFrames is not
* Strict, frames without a SecTAG are received, counted, and
* delivered to the Controlled Port
*/
if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsNoTag++;
u64_stats_update_end(&secy_stats->syncp);
continue;
}
/* deliver on this port */
nskb = skb_clone(skb, GFP_ATOMIC);
if (!nskb)
break;
nskb->dev = ndev;
if (netif_rx(nskb) == NET_RX_SUCCESS) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsUntagged++;
u64_stats_update_end(&secy_stats->syncp);
}
}
out:
rcu_read_unlock();
return ret;
}
static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
struct net_device *dev = skb->dev;
struct macsec_eth_header *hdr;
struct macsec_secy *secy = NULL;
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
struct macsec_rxh_data *rxd;
struct macsec_dev *macsec;
sci_t sci;
u32 hdr_pn;
bool cbit;
struct pcpu_rx_sc_stats *rxsc_stats;
struct pcpu_secy_stats *secy_stats;
bool pulled_sci;
int ret;
if (skb_headroom(skb) < ETH_HLEN)
goto drop_direct;
hdr = macsec_ethhdr(skb);
if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
return handle_not_macsec(skb);
skb = skb_unshare(skb, GFP_ATOMIC);
*pskb = skb;
if (!skb)
return RX_HANDLER_CONSUMED;
pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
if (!pulled_sci) {
if (!pskb_may_pull(skb, macsec_extra_len(false)))
goto drop_direct;
}
hdr = macsec_ethhdr(skb);
/* Frames with a SecTAG that has the TCI E bit set but the C
* bit clear are discarded, as this reserved encoding is used
* to identify frames with a SecTAG that are not to be
* delivered to the Controlled Port.
*/
if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
return RX_HANDLER_PASS;
/* now, pull the extra length */
if (hdr->tci_an & MACSEC_TCI_SC) {
if (!pulled_sci)
goto drop_direct;
}
/* ethernet header is part of crypto processing */
skb_push(skb, ETH_HLEN);
macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
rcu_read_lock();
rxd = macsec_data_rcu(skb->dev);
list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
sc = sc ? macsec_rxsc_get(sc) : NULL;
if (sc) {
secy = &macsec->secy;
rx_sc = sc;
break;
}
}
if (!secy)
goto nosci;
dev = secy->netdev;
macsec = macsec_priv(dev);
secy_stats = this_cpu_ptr(macsec->stats);
rxsc_stats = this_cpu_ptr(rx_sc->stats);
if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsBadTag++;
u64_stats_update_end(&secy_stats->syncp);
goto drop_nosa;
}
rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
if (!rx_sa) {
/* 10.6.1 if the SA is not in use */
/* If validateFrames is Strict or the C bit in the
* SecTAG is set, discard
*/
if (hdr->tci_an & MACSEC_TCI_C ||
secy->validate_frames == MACSEC_VALIDATE_STRICT) {
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsNotUsingSA++;
u64_stats_update_end(&rxsc_stats->syncp);
goto drop_nosa;
}
/* not Strict, the frame (with the SecTAG and ICV
* removed) is delivered to the Controlled Port.
*/
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsUnusedSA++;
u64_stats_update_end(&rxsc_stats->syncp);
goto deliver;
}
/* First, PN check to avoid decrypting obviously wrong packets */
hdr_pn = ntohl(hdr->packet_number);
if (secy->replay_protect) {
bool late;
spin_lock(&rx_sa->lock);
late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
if (secy->xpn)
late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
spin_unlock(&rx_sa->lock);
if (late) {
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsLate++;
u64_stats_update_end(&rxsc_stats->syncp);
goto drop;
}
}
macsec_skb_cb(skb)->rx_sa = rx_sa;
/* Disabled && !changed text => skip validation */
if (hdr->tci_an & MACSEC_TCI_C ||
secy->validate_frames != MACSEC_VALIDATE_DISABLED)
skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
if (IS_ERR(skb)) {
/* the decrypt callback needs the reference */
if (PTR_ERR(skb) != -EINPROGRESS) {
macsec_rxsa_put(rx_sa);
macsec_rxsc_put(rx_sc);
}
rcu_read_unlock();
*pskb = NULL;
return RX_HANDLER_CONSUMED;
}
if (!macsec_post_decrypt(skb, secy, hdr_pn))
goto drop;
deliver:
macsec_finalize_skb(skb, secy->icv_len,
macsec_extra_len(macsec_skb_cb(skb)->has_sci));
macsec_reset_skb(skb, secy->netdev);
if (rx_sa)
macsec_rxsa_put(rx_sa);
macsec_rxsc_put(rx_sc);
skb_orphan(skb);
ret = gro_cells_receive(&macsec->gro_cells, skb);
if (ret == NET_RX_SUCCESS)
count_rx(dev, skb->len);
else
macsec->secy.netdev->stats.rx_dropped++;
rcu_read_unlock();
*pskb = NULL;
return RX_HANDLER_CONSUMED;
drop:
macsec_rxsa_put(rx_sa);
drop_nosa:
macsec_rxsc_put(rx_sc);
rcu_read_unlock();
drop_direct:
kfree_skb(skb);
*pskb = NULL;
return RX_HANDLER_CONSUMED;
nosci:
/* 10.6.1 if the SC is not found */
cbit = !!(hdr->tci_an & MACSEC_TCI_C);
if (!cbit)
macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
macsec_extra_len(macsec_skb_cb(skb)->has_sci));
list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
struct sk_buff *nskb;
secy_stats = this_cpu_ptr(macsec->stats);
/* If validateFrames is Strict or the C bit in the
* SecTAG is set, discard
*/
if (cbit ||
macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsNoSCI++;
u64_stats_update_end(&secy_stats->syncp);
continue;
}
/* not strict, the frame (with the SecTAG and ICV
* removed) is delivered to the Controlled Port.
*/
nskb = skb_clone(skb, GFP_ATOMIC);
if (!nskb)
break;
macsec_reset_skb(nskb, macsec->secy.netdev);
ret = netif_rx(nskb);
if (ret == NET_RX_SUCCESS) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsUnknownSCI++;
u64_stats_update_end(&secy_stats->syncp);
} else {
macsec->secy.netdev->stats.rx_dropped++;
}
}
rcu_read_unlock();
*pskb = skb;
return RX_HANDLER_PASS;
}
static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
{
struct crypto_aead *tfm;
int ret;
/* Pick a sync gcm(aes) cipher to ensure order is preserved. */
tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm))
return tfm;
ret = crypto_aead_setkey(tfm, key, key_len);
if (ret < 0)
goto fail;
ret = crypto_aead_setauthsize(tfm, icv_len);
if (ret < 0)
goto fail;
return tfm;
fail:
crypto_free_aead(tfm);
return ERR_PTR(ret);
}
static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
int icv_len)
{
rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
if (!rx_sa->stats)
return -ENOMEM;
rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
if (IS_ERR(rx_sa->key.tfm)) {
free_percpu(rx_sa->stats);
return PTR_ERR(rx_sa->key.tfm);
}
rx_sa->ssci = MACSEC_UNDEF_SSCI;
rx_sa->active = false;
rx_sa->next_pn = 1;
refcount_set(&rx_sa->refcnt, 1);
spin_lock_init(&rx_sa->lock);
return 0;
}
static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
{
rx_sa->active = false;
macsec_rxsa_put(rx_sa);
}
static void free_rx_sc(struct macsec_rx_sc *rx_sc)
{
int i;
for (i = 0; i < MACSEC_NUM_AN; i++) {
struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
RCU_INIT_POINTER(rx_sc->sa[i], NULL);
if (sa)
clear_rx_sa(sa);
}
macsec_rxsc_put(rx_sc);
}
static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
{
struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
rx_sc;
rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
if (rx_sc->sci == sci) {
if (rx_sc->active)
secy->n_rx_sc--;
rcu_assign_pointer(*rx_scp, rx_sc->next);
return rx_sc;
}
}
return NULL;
}
static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
{
struct macsec_rx_sc *rx_sc;
struct macsec_dev *macsec;
struct net_device *real_dev = macsec_priv(dev)->real_dev;
struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
struct macsec_secy *secy;
list_for_each_entry(macsec, &rxd->secys, secys) {
if (find_rx_sc_rtnl(&macsec->secy, sci))
return ERR_PTR(-EEXIST);
}
rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
if (!rx_sc)
return ERR_PTR(-ENOMEM);
rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
if (!rx_sc->stats) {
kfree(rx_sc);
return ERR_PTR(-ENOMEM);
}
rx_sc->sci = sci;
rx_sc->active = true;
refcount_set(&rx_sc->refcnt, 1);
secy = &macsec_priv(dev)->secy;
rcu_assign_pointer(rx_sc->next, secy->rx_sc);
rcu_assign_pointer(secy->rx_sc, rx_sc);
if (rx_sc->active)
secy->n_rx_sc++;
return rx_sc;
}
static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
int icv_len)
{
tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
if (!tx_sa->stats)
return -ENOMEM;
tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
if (IS_ERR(tx_sa->key.tfm)) {
free_percpu(tx_sa->stats);
return PTR_ERR(tx_sa->key.tfm);
}
tx_sa->ssci = MACSEC_UNDEF_SSCI;
tx_sa->active = false;
refcount_set(&tx_sa->refcnt, 1);
spin_lock_init(&tx_sa->lock);
return 0;
}
static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
{
tx_sa->active = false;
macsec_txsa_put(tx_sa);
}
static struct genl_family macsec_fam;
static struct net_device *get_dev_from_nl(struct net *net,
struct nlattr **attrs)
{
int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
struct net_device *dev;
dev = __dev_get_by_index(net, ifindex);
if (!dev)
return ERR_PTR(-ENODEV);
if (!netif_is_macsec(dev))
return ERR_PTR(-ENODEV);
return dev;
}
static enum macsec_offload nla_get_offload(const struct nlattr *nla)
{
return (__force enum macsec_offload)nla_get_u8(nla);
}
static sci_t nla_get_sci(const struct nlattr *nla)
{
return (__force sci_t)nla_get_u64(nla);
}
static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
int padattr)
{
return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
}
static ssci_t nla_get_ssci(const struct nlattr *nla)
{
return (__force ssci_t)nla_get_u32(nla);
}
static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
{
return nla_put_u32(skb, attrtype, (__force u64)value);
}
static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
struct nlattr **attrs,
struct nlattr **tb_sa,
struct net_device **devp,
struct macsec_secy **secyp,
struct macsec_tx_sc **scp,
u8 *assoc_num)
{
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
if (!tb_sa[MACSEC_SA_ATTR_AN])
return ERR_PTR(-EINVAL);
*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
dev = get_dev_from_nl(net, attrs);
if (IS_ERR(dev))
return ERR_CAST(dev);
if (*assoc_num >= MACSEC_NUM_AN)
return ERR_PTR(-EINVAL);
secy = &macsec_priv(dev)->secy;
tx_sc = &secy->tx_sc;
tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
if (!tx_sa)
return ERR_PTR(-ENODEV);
*devp = dev;
*scp = tx_sc;
*secyp = secy;
return tx_sa;
}
static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
struct nlattr **attrs,
struct nlattr **tb_rxsc,
struct net_device **devp,
struct macsec_secy **secyp)
{
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
sci_t sci;
dev = get_dev_from_nl(net, attrs);
if (IS_ERR(dev))
return ERR_CAST(dev);
secy = &macsec_priv(dev)->secy;
if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
return ERR_PTR(-EINVAL);
sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
rx_sc = find_rx_sc_rtnl(secy, sci);
if (!rx_sc)
return ERR_PTR(-ENODEV);
*secyp = secy;
*devp = dev;
return rx_sc;
}
static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
struct nlattr **attrs,
struct nlattr **tb_rxsc,
struct nlattr **tb_sa,
struct net_device **devp,
struct macsec_secy **secyp,
struct macsec_rx_sc **scp,
u8 *assoc_num)
{
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
if (!tb_sa[MACSEC_SA_ATTR_AN])
return ERR_PTR(-EINVAL);
*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
if (*assoc_num >= MACSEC_NUM_AN)
return ERR_PTR(-EINVAL);
rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
if (IS_ERR(rx_sc))
return ERR_CAST(rx_sc);
rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
if (!rx_sa)
return ERR_PTR(-ENODEV);
*scp = rx_sc;
return rx_sa;
}
static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
[MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
[MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
[MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
[MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
};
static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
[MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
[MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
};
static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
[MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
[MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
[MACSEC_SA_ATTR_PN] = { .type = NLA_MIN_LEN, .len = 4 },
[MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
.len = MACSEC_KEYID_LEN, },
[MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
.len = MACSEC_MAX_KEY_LEN, },
[MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
[MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
.len = MACSEC_SALT_LEN, },
};
static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
[MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
};
/* Offloads an operation to a device driver */
static int macsec_offload(int (* const func)(struct macsec_context *),
struct macsec_context *ctx)
{
int ret;
if (unlikely(!func))
return 0;
if (ctx->offload == MACSEC_OFFLOAD_PHY)
mutex_lock(&ctx->phydev->lock);
/* Phase I: prepare. The drive should fail here if there are going to be
* issues in the commit phase.
*/
ctx->prepare = true;
ret = (*func)(ctx);
if (ret)
goto phy_unlock;
/* Phase II: commit. This step cannot fail. */
ctx->prepare = false;
ret = (*func)(ctx);
/* This should never happen: commit is not allowed to fail */
if (unlikely(ret))
WARN(1, "MACsec offloading commit failed (%d)\n", ret);
phy_unlock:
if (ctx->offload == MACSEC_OFFLOAD_PHY)
mutex_unlock(&ctx->phydev->lock);
return ret;
}
static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
{
if (!attrs[MACSEC_ATTR_SA_CONFIG])
return -EINVAL;
if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
return -EINVAL;
return 0;
}
static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
{
if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
return -EINVAL;
if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
return -EINVAL;
return 0;
}
static bool validate_add_rxsa(struct nlattr **attrs)
{
if (!attrs[MACSEC_SA_ATTR_AN] ||
!attrs[MACSEC_SA_ATTR_KEY] ||
!attrs[MACSEC_SA_ATTR_KEYID])
return false;
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;
if (attrs[MACSEC_SA_ATTR_PN] &&
*(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;
if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
return false;
}
if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
return false;
return true;
}
static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
struct nlattr **attrs = info->attrs;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
unsigned char assoc_num;
int pn_len;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
int err;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (!validate_add_rxsa(tb_sa))
return -EINVAL;
rtnl_lock();
rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
if (IS_ERR(rx_sc)) {
rtnl_unlock();
return PTR_ERR(rx_sc);
}
assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
rtnl_unlock();
return -EINVAL;
}
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
rtnl_unlock();
return -EINVAL;
}
if (secy->xpn) {
if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
rtnl_unlock();
return -EINVAL;
}
if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
MACSEC_SA_ATTR_SALT);
rtnl_unlock();
return -EINVAL;
}
}
rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
if (rx_sa) {
rtnl_unlock();
return -EBUSY;
}
rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
if (!rx_sa) {
rtnl_unlock();
return -ENOMEM;
}
err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
secy->key_len, secy->icv_len);
if (err < 0) {
kfree(rx_sa);
rtnl_unlock();
return err;
}
if (tb_sa[MACSEC_SA_ATTR_PN]) {
spin_lock_bh(&rx_sa->lock);
rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&rx_sa->lock);
}
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
rx_sa->sc = rx_sc;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
err = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.rx_sa = rx_sa;
ctx.secy = secy;
memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
MACSEC_KEYID_LEN);
err = macsec_offload(ops->mdo_add_rxsa, &ctx);
if (err)
goto cleanup;
}
if (secy->xpn) {
rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
MACSEC_SALT_LEN);
}
nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
rtnl_unlock();
return 0;
cleanup:
kfree(rx_sa);
rtnl_unlock();
return err;
}
static bool validate_add_rxsc(struct nlattr **attrs)
{
if (!attrs[MACSEC_RXSC_ATTR_SCI])
return false;
if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
return false;
}
return true;
}
static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
sci_t sci = MACSEC_UNDEF_SCI;
struct nlattr **attrs = info->attrs;
struct macsec_rx_sc *rx_sc;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
struct macsec_secy *secy;
bool was_active;
int ret;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (!validate_add_rxsc(tb_rxsc))
return -EINVAL;
rtnl_lock();
dev = get_dev_from_nl(genl_info_net(info), attrs);
if (IS_ERR(dev)) {
rtnl_unlock();
return PTR_ERR(dev);
}
secy = &macsec_priv(dev)->secy;
sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
rx_sc = create_rx_sc(dev, sci);
if (IS_ERR(rx_sc)) {
rtnl_unlock();
return PTR_ERR(rx_sc);
}
was_active = rx_sc->active;
if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.rx_sc = rx_sc;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
if (ret)
goto cleanup;
}
rtnl_unlock();
return 0;
cleanup:
rx_sc->active = was_active;
rtnl_unlock();
return ret;
}
static bool validate_add_txsa(struct nlattr **attrs)
{
if (!attrs[MACSEC_SA_ATTR_AN] ||
!attrs[MACSEC_SA_ATTR_PN] ||
!attrs[MACSEC_SA_ATTR_KEY] ||
!attrs[MACSEC_SA_ATTR_KEYID])
return false;
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;
if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;
if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
return false;
}
if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
return false;
return true;
}
static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
struct nlattr **attrs = info->attrs;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
unsigned char assoc_num;
int pn_len;
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
bool was_operational;
int err;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (!validate_add_txsa(tb_sa))
return -EINVAL;
rtnl_lock();
dev = get_dev_from_nl(genl_info_net(info), attrs);
if (IS_ERR(dev)) {
rtnl_unlock();
return PTR_ERR(dev);
}
secy = &macsec_priv(dev)->secy;
tx_sc = &secy->tx_sc;
assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
rtnl_unlock();
return -EINVAL;
}
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
rtnl_unlock();
return -EINVAL;
}
if (secy->xpn) {
if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
rtnl_unlock();
return -EINVAL;
}
if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
MACSEC_SA_ATTR_SALT);
rtnl_unlock();
return -EINVAL;
}
}
tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
if (tx_sa) {
rtnl_unlock();
return -EBUSY;
}
tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
if (!tx_sa) {
rtnl_unlock();
return -ENOMEM;
}
err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
secy->key_len, secy->icv_len);
if (err < 0) {
kfree(tx_sa);
rtnl_unlock();
return err;
}
spin_lock_bh(&tx_sa->lock);
tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&tx_sa->lock);
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
was_operational = secy->operational;
if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
secy->operational = true;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
err = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.tx_sa = tx_sa;
ctx.secy = secy;
memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
MACSEC_KEYID_LEN);
err = macsec_offload(ops->mdo_add_txsa, &ctx);
if (err)
goto cleanup;
}
if (secy->xpn) {
tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
MACSEC_SALT_LEN);
}
nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
rtnl_unlock();
return 0;
cleanup:
secy->operational = was_operational;
kfree(tx_sa);
rtnl_unlock();
return err;
}
static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
u8 assoc_num;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
int ret;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
rtnl_lock();
rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
&dev, &secy, &rx_sc, &assoc_num);
if (IS_ERR(rx_sa)) {
rtnl_unlock();
return PTR_ERR(rx_sa);
}
if (rx_sa->active) {
rtnl_unlock();
return -EBUSY;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.rx_sa = rx_sa;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
if (ret)
goto cleanup;
}
RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
clear_rx_sa(rx_sa);
rtnl_unlock();
return 0;
cleanup:
rtnl_unlock();
return ret;
}
static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
sci_t sci;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
int ret;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
return -EINVAL;
rtnl_lock();
dev = get_dev_from_nl(genl_info_net(info), info->attrs);
if (IS_ERR(dev)) {
rtnl_unlock();
return PTR_ERR(dev);
}
secy = &macsec_priv(dev)->secy;
sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
rx_sc = del_rx_sc(secy, sci);
if (!rx_sc) {
rtnl_unlock();
return -ENODEV;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.rx_sc = rx_sc;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
if (ret)
goto cleanup;
}
free_rx_sc(rx_sc);
rtnl_unlock();
return 0;
cleanup:
rtnl_unlock();
return ret;
}
static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
u8 assoc_num;
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
int ret;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
rtnl_lock();
tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
&dev, &secy, &tx_sc, &assoc_num);
if (IS_ERR(tx_sa)) {
rtnl_unlock();
return PTR_ERR(tx_sa);
}
if (tx_sa->active) {
rtnl_unlock();
return -EBUSY;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.tx_sa = tx_sa;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_del_txsa, &ctx);
if (ret)
goto cleanup;
}
RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
clear_tx_sa(tx_sa);
rtnl_unlock();
return 0;
cleanup:
rtnl_unlock();
return ret;
}
static bool validate_upd_sa(struct nlattr **attrs)
{
if (!attrs[MACSEC_SA_ATTR_AN] ||
attrs[MACSEC_SA_ATTR_KEY] ||
attrs[MACSEC_SA_ATTR_KEYID] ||
attrs[MACSEC_SA_ATTR_SSCI] ||
attrs[MACSEC_SA_ATTR_SALT])
return false;
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;
if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;
if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
return false;
}
return true;
}
static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
u8 assoc_num;
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
bool was_operational, was_active;
pn_t prev_pn;
int ret = 0;
prev_pn.full64 = 0;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (!validate_upd_sa(tb_sa))
return -EINVAL;
rtnl_lock();
tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
&dev, &secy, &tx_sc, &assoc_num);
if (IS_ERR(tx_sa)) {
rtnl_unlock();
return PTR_ERR(tx_sa);
}
if (tb_sa[MACSEC_SA_ATTR_PN]) {
int pn_len;
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
rtnl_unlock();
return -EINVAL;
}
spin_lock_bh(&tx_sa->lock);
prev_pn = tx_sa->next_pn_halves;
tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&tx_sa->lock);
}
was_active = tx_sa->active;
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
was_operational = secy->operational;
if (assoc_num == tx_sc->encoding_sa)
secy->operational = tx_sa->active;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.tx_sa = tx_sa;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
if (ret)
goto cleanup;
}
rtnl_unlock();
return 0;
cleanup:
if (tb_sa[MACSEC_SA_ATTR_PN]) {
spin_lock_bh(&tx_sa->lock);
tx_sa->next_pn_halves = prev_pn;
spin_unlock_bh(&tx_sa->lock);
}
tx_sa->active = was_active;
secy->operational = was_operational;
rtnl_unlock();
return ret;
}
static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
u8 assoc_num;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
bool was_active;
pn_t prev_pn;
int ret = 0;
prev_pn.full64 = 0;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (!validate_upd_sa(tb_sa))
return -EINVAL;
rtnl_lock();
rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
&dev, &secy, &rx_sc, &assoc_num);
if (IS_ERR(rx_sa)) {
rtnl_unlock();
return PTR_ERR(rx_sa);
}
if (tb_sa[MACSEC_SA_ATTR_PN]) {
int pn_len;
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
rtnl_unlock();
return -EINVAL;
}
spin_lock_bh(&rx_sa->lock);
prev_pn = rx_sa->next_pn_halves;
rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&rx_sa->lock);
}
was_active = rx_sa->active;
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.sa.assoc_num = assoc_num;
ctx.sa.rx_sa = rx_sa;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
if (ret)
goto cleanup;
}
rtnl_unlock();
return 0;
cleanup:
if (tb_sa[MACSEC_SA_ATTR_PN]) {
spin_lock_bh(&rx_sa->lock);
rx_sa->next_pn_halves = prev_pn;
spin_unlock_bh(&rx_sa->lock);
}
rx_sa->active = was_active;
rtnl_unlock();
return ret;
}
static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
unsigned int prev_n_rx_sc;
bool was_active;
int ret;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (!validate_add_rxsc(tb_rxsc))
return -EINVAL;
rtnl_lock();
rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
if (IS_ERR(rx_sc)) {
rtnl_unlock();
return PTR_ERR(rx_sc);
}
was_active = rx_sc->active;
prev_n_rx_sc = secy->n_rx_sc;
if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
if (rx_sc->active != new)
secy->n_rx_sc += new ? 1 : -1;
rx_sc->active = new;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(netdev_priv(dev))) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.rx_sc = rx_sc;
ctx.secy = secy;
ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
if (ret)
goto cleanup;
}
rtnl_unlock();
return 0;
cleanup:
secy->n_rx_sc = prev_n_rx_sc;
rx_sc->active = was_active;
rtnl_unlock();
return ret;
}
static bool macsec_is_configured(struct macsec_dev *macsec)
{
struct macsec_secy *secy = &macsec->secy;
struct macsec_tx_sc *tx_sc = &secy->tx_sc;
int i;
if (secy->n_rx_sc > 0)
return true;
for (i = 0; i < MACSEC_NUM_AN; i++)
if (tx_sc->sa[i])
return true;
return false;
}
static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
enum macsec_offload offload, prev_offload;
int (*func)(struct macsec_context *ctx);
struct nlattr **attrs = info->attrs;
struct net_device *dev;
const struct macsec_ops *ops;
struct macsec_context ctx;
struct macsec_dev *macsec;
int ret;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (!attrs[MACSEC_ATTR_OFFLOAD])
return -EINVAL;
if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
attrs[MACSEC_ATTR_OFFLOAD],
macsec_genl_offload_policy, NULL))
return -EINVAL;
dev = get_dev_from_nl(genl_info_net(info), attrs);
if (IS_ERR(dev))
return PTR_ERR(dev);
macsec = macsec_priv(dev);
if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
return -EINVAL;
offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
if (macsec->offload == offload)
return 0;
/* Check if the offloading mode is supported by the underlying layers */
if (offload != MACSEC_OFFLOAD_OFF &&
!macsec_check_offload(offload, macsec))
return -EOPNOTSUPP;
/* Check if the net device is busy. */
if (netif_running(dev))
return -EBUSY;
rtnl_lock();
prev_offload = macsec->offload;
macsec->offload = offload;
/* Check if the device already has rules configured: we do not support
* rules migration.
*/
if (macsec_is_configured(macsec)) {
ret = -EBUSY;
goto rollback;
}
ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
macsec, &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto rollback;
}
if (prev_offload == MACSEC_OFFLOAD_OFF)
func = ops->mdo_add_secy;
else
func = ops->mdo_del_secy;
ctx.secy = &macsec->secy;
ret = macsec_offload(func, &ctx);
if (ret)
goto rollback;
/* Force features update, since they are different for SW MACSec and
* HW offloading cases.
*/
netdev_update_features(dev);
rtnl_unlock();
return 0;
rollback:
macsec->offload = prev_offload;
rtnl_unlock();
return ret;
}
static void get_tx_sa_stats(struct net_device *dev, int an,
struct macsec_tx_sa *tx_sa,
struct macsec_tx_sa_stats *sum)
{
struct macsec_dev *macsec = macsec_priv(dev);
int cpu;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.sa.assoc_num = an;
ctx.sa.tx_sa = tx_sa;
ctx.stats.tx_sa_stats = sum;
ctx.secy = &macsec_priv(dev)->secy;
macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
}
return;
}
for_each_possible_cpu(cpu) {
const struct macsec_tx_sa_stats *stats =
per_cpu_ptr(tx_sa->stats, cpu);
sum->OutPktsProtected += stats->OutPktsProtected;
sum->OutPktsEncrypted += stats->OutPktsEncrypted;
}
}
static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
{
if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
sum->OutPktsProtected) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
sum->OutPktsEncrypted))
return -EMSGSIZE;
return 0;
}
static void get_rx_sa_stats(struct net_device *dev,
struct macsec_rx_sc *rx_sc, int an,
struct macsec_rx_sa *rx_sa,
struct macsec_rx_sa_stats *sum)
{
struct macsec_dev *macsec = macsec_priv(dev);
int cpu;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.sa.assoc_num = an;
ctx.sa.rx_sa = rx_sa;
ctx.stats.rx_sa_stats = sum;
ctx.secy = &macsec_priv(dev)->secy;
ctx.rx_sc = rx_sc;
macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
}
return;
}
for_each_possible_cpu(cpu) {
const struct macsec_rx_sa_stats *stats =
per_cpu_ptr(rx_sa->stats, cpu);
sum->InPktsOK += stats->InPktsOK;
sum->InPktsInvalid += stats->InPktsInvalid;
sum->InPktsNotValid += stats->InPktsNotValid;
sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
sum->InPktsUnusedSA += stats->InPktsUnusedSA;
}
}
static int copy_rx_sa_stats(struct sk_buff *skb,
struct macsec_rx_sa_stats *sum)
{
if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
sum->InPktsInvalid) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
sum->InPktsNotValid) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
sum->InPktsNotUsingSA) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
sum->InPktsUnusedSA))
return -EMSGSIZE;
return 0;
}
static void get_rx_sc_stats(struct net_device *dev,
struct macsec_rx_sc *rx_sc,
struct macsec_rx_sc_stats *sum)
{
struct macsec_dev *macsec = macsec_priv(dev);
int cpu;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.stats.rx_sc_stats = sum;
ctx.secy = &macsec_priv(dev)->secy;
ctx.rx_sc = rx_sc;
macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
}
return;
}
for_each_possible_cpu(cpu) {
const struct pcpu_rx_sc_stats *stats;
struct macsec_rx_sc_stats tmp;
unsigned int start;
stats = per_cpu_ptr(rx_sc->stats, cpu);
do {
start = u64_stats_fetch_begin_irq(&stats->syncp);
memcpy(&tmp, &stats->stats, sizeof(tmp));
} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
sum->InOctetsValidated += tmp.InOctetsValidated;
sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
sum->InPktsUnchecked += tmp.InPktsUnchecked;
sum->InPktsDelayed += tmp.InPktsDelayed;
sum->InPktsOK += tmp.InPktsOK;
sum->InPktsInvalid += tmp.InPktsInvalid;
sum->InPktsLate += tmp.InPktsLate;
sum->InPktsNotValid += tmp.InPktsNotValid;
sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
}
}
static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
{
if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
sum->InOctetsValidated,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
sum->InOctetsDecrypted,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
sum->InPktsUnchecked,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
sum->InPktsDelayed,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
sum->InPktsOK,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
sum->InPktsInvalid,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
sum->InPktsLate,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
sum->InPktsNotValid,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
sum->InPktsNotUsingSA,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
sum->InPktsUnusedSA,
MACSEC_RXSC_STATS_ATTR_PAD))
return -EMSGSIZE;
return 0;
}
static void get_tx_sc_stats(struct net_device *dev,
struct macsec_tx_sc_stats *sum)
{
struct macsec_dev *macsec = macsec_priv(dev);
int cpu;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.stats.tx_sc_stats = sum;
ctx.secy = &macsec_priv(dev)->secy;
macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
}
return;
}
for_each_possible_cpu(cpu) {
const struct pcpu_tx_sc_stats *stats;
struct macsec_tx_sc_stats tmp;
unsigned int start;
stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
do {
start = u64_stats_fetch_begin_irq(&stats->syncp);
memcpy(&tmp, &stats->stats, sizeof(tmp));
} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
sum->OutPktsProtected += tmp.OutPktsProtected;
sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
sum->OutOctetsProtected += tmp.OutOctetsProtected;
sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
}
}
static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
{
if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
sum->OutPktsProtected,
MACSEC_TXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
sum->OutPktsEncrypted,
MACSEC_TXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
sum->OutOctetsProtected,
MACSEC_TXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
sum->OutOctetsEncrypted,
MACSEC_TXSC_STATS_ATTR_PAD))
return -EMSGSIZE;
return 0;
}
static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
{
struct macsec_dev *macsec = macsec_priv(dev);
int cpu;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.stats.dev_stats = sum;
ctx.secy = &macsec_priv(dev)->secy;
macsec_offload(ops->mdo_get_dev_stats, &ctx);
}
return;
}
for_each_possible_cpu(cpu) {
const struct pcpu_secy_stats *stats;
struct macsec_dev_stats tmp;
unsigned int start;
stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
do {
start = u64_stats_fetch_begin_irq(&stats->syncp);
memcpy(&tmp, &stats->stats, sizeof(tmp));
} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
sum->OutPktsUntagged += tmp.OutPktsUntagged;
sum->InPktsUntagged += tmp.InPktsUntagged;
sum->OutPktsTooLong += tmp.OutPktsTooLong;
sum->InPktsNoTag += tmp.InPktsNoTag;
sum->InPktsBadTag += tmp.InPktsBadTag;
sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
sum->InPktsNoSCI += tmp.InPktsNoSCI;
sum->InPktsOverrun += tmp.InPktsOverrun;
}
}
static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
{
if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
sum->OutPktsUntagged,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
sum->InPktsUntagged,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
sum->OutPktsTooLong,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
sum->InPktsNoTag,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
sum->InPktsBadTag,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
sum->InPktsUnknownSCI,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
sum->InPktsNoSCI,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
sum->InPktsOverrun,
MACSEC_SECY_STATS_ATTR_PAD))
return -EMSGSIZE;
return 0;
}
static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
{
struct macsec_tx_sc *tx_sc = &secy->tx_sc;
struct nlattr *secy_nest = nla_nest_start_noflag(skb,
MACSEC_ATTR_SECY);
u64 csid;
if (!secy_nest)
return 1;
switch (secy->key_len) {
case MACSEC_GCM_AES_128_SAK_LEN:
csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
break;
case MACSEC_GCM_AES_256_SAK_LEN:
csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
break;
default:
goto cancel;
}
if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
MACSEC_SECY_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
csid, MACSEC_SECY_ATTR_PAD) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
goto cancel;
if (secy->replay_protect) {
if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
goto cancel;
}
nla_nest_end(skb, secy_nest);
return 0;
cancel:
nla_nest_cancel(skb, secy_nest);
return 1;
}
static noinline_for_stack int
dump_secy(struct macsec_secy *secy, struct net_device *dev,
struct sk_buff *skb, struct netlink_callback *cb)
{
struct macsec_tx_sc_stats tx_sc_stats = {0, };
struct macsec_tx_sa_stats tx_sa_stats = {0, };
struct macsec_rx_sc_stats rx_sc_stats = {0, };
struct macsec_rx_sa_stats rx_sa_stats = {0, };
struct macsec_dev *macsec = netdev_priv(dev);
struct macsec_dev_stats dev_stats = {0, };
struct macsec_tx_sc *tx_sc = &secy->tx_sc;
struct nlattr *txsa_list, *rxsc_list;
struct macsec_rx_sc *rx_sc;
struct nlattr *attr;
void *hdr;
int i, j;
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
&macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
if (!hdr)
return -EMSGSIZE;
genl_dump_check_consistent(cb, hdr);
if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
goto nla_put_failure;
attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
if (!attr)
goto nla_put_failure;
if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
goto nla_put_failure;
nla_nest_end(skb, attr);
if (nla_put_secy(secy, skb))
goto nla_put_failure;
attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
if (!attr)
goto nla_put_failure;
get_tx_sc_stats(dev, &tx_sc_stats);
if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
nla_nest_cancel(skb, attr);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
if (!attr)
goto nla_put_failure;
get_secy_stats(dev, &dev_stats);
if (copy_secy_stats(skb, &dev_stats)) {
nla_nest_cancel(skb, attr);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
if (!txsa_list)
goto nla_put_failure;
for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
struct nlattr *txsa_nest;
u64 pn;
int pn_len;
if (!tx_sa)
continue;
txsa_nest = nla_nest_start_noflag(skb, j++);
if (!txsa_nest) {
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
if (!attr) {
nla_nest_cancel(skb, txsa_nest);
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
nla_nest_cancel(skb, attr);
nla_nest_cancel(skb, txsa_nest);
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
if (secy->xpn) {
pn = tx_sa->next_pn;
pn_len = MACSEC_XPN_PN_LEN;
} else {
pn = tx_sa->next_pn_halves.lower;
pn_len = MACSEC_DEFAULT_PN_LEN;
}
if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
(secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
nla_nest_cancel(skb, txsa_nest);
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
nla_nest_end(skb, txsa_nest);
}
nla_nest_end(skb, txsa_list);
rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
if (!rxsc_list)
goto nla_put_failure;
j = 1;
for_each_rxsc_rtnl(secy, rx_sc) {
int k;
struct nlattr *rxsa_list;
struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
if (!rxsc_nest) {
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
MACSEC_RXSC_ATTR_PAD)) {
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
if (!attr) {
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
nla_nest_cancel(skb, attr);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
rxsa_list = nla_nest_start_noflag(skb,
MACSEC_RXSC_ATTR_SA_LIST);
if (!rxsa_list) {
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
struct nlattr *rxsa_nest;
u64 pn;
int pn_len;
if (!rx_sa)
continue;
rxsa_nest = nla_nest_start_noflag(skb, k++);
if (!rxsa_nest) {
nla_nest_cancel(skb, rxsa_list);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
attr = nla_nest_start_noflag(skb,
MACSEC_SA_ATTR_STATS);
if (!attr) {
nla_nest_cancel(skb, rxsa_list);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
nla_nest_cancel(skb, attr);
nla_nest_cancel(skb, rxsa_list);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
if (secy->xpn) {
pn = rx_sa->next_pn;
pn_len = MACSEC_XPN_PN_LEN;
} else {
pn = rx_sa->next_pn_halves.lower;
pn_len = MACSEC_DEFAULT_PN_LEN;
}
if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
(secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
nla_nest_cancel(skb, rxsa_nest);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
nla_nest_end(skb, rxsa_nest);
}
nla_nest_end(skb, rxsa_list);
nla_nest_end(skb, rxsc_nest);
}
nla_nest_end(skb, rxsc_list);
genlmsg_end(skb, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(skb, hdr);
return -EMSGSIZE;
}
static int macsec_generation = 1; /* protected by RTNL */
static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct net_device *dev;
int dev_idx, d;
dev_idx = cb->args[0];
d = 0;
rtnl_lock();
cb->seq = macsec_generation;
for_each_netdev(net, dev) {
struct macsec_secy *secy;
if (d < dev_idx)
goto next;
if (!netif_is_macsec(dev))
goto next;
secy = &macsec_priv(dev)->secy;
if (dump_secy(secy, dev, skb, cb) < 0)
goto done;
next:
d++;
}
done:
rtnl_unlock();
cb->args[0] = d;
return skb->len;
}
static const struct genl_ops macsec_genl_ops[] = {
{
.cmd = MACSEC_CMD_GET_TXSC,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.dumpit = macsec_dump_txsc,
},
{
.cmd = MACSEC_CMD_ADD_RXSC,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_add_rxsc,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_DEL_RXSC,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_del_rxsc,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_UPD_RXSC,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_upd_rxsc,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_ADD_TXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_add_txsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_DEL_TXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_del_txsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_UPD_TXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_upd_txsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_ADD_RXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_add_rxsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_DEL_RXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_del_rxsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_UPD_RXSA,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_upd_rxsa,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_UPD_OFFLOAD,
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
.doit = macsec_upd_offload,
.flags = GENL_ADMIN_PERM,
},
};
static struct genl_family macsec_fam __ro_after_init = {
.name = MACSEC_GENL_NAME,
.hdrsize = 0,
.version = MACSEC_GENL_VERSION,
.maxattr = MACSEC_ATTR_MAX,
.policy = macsec_genl_policy,
.netnsok = true,
.module = THIS_MODULE,
.ops = macsec_genl_ops,
.n_ops = ARRAY_SIZE(macsec_genl_ops),
};
static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
struct net_device *dev)
{
struct macsec_dev *macsec = netdev_priv(dev);
struct macsec_secy *secy = &macsec->secy;
struct pcpu_secy_stats *secy_stats;
int ret, len;
if (macsec_is_offloaded(netdev_priv(dev))) {
skb->dev = macsec->real_dev;
return dev_queue_xmit(skb);
}
/* 10.5 */
if (!secy->protect_frames) {
secy_stats = this_cpu_ptr(macsec->stats);
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.OutPktsUntagged++;
u64_stats_update_end(&secy_stats->syncp);
skb->dev = macsec->real_dev;
len = skb->len;
ret = dev_queue_xmit(skb);
count_tx(dev, ret, len);
return ret;
}
if (!secy->operational) {
kfree_skb(skb);
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
skb = macsec_encrypt(skb, dev);
if (IS_ERR(skb)) {
if (PTR_ERR(skb) != -EINPROGRESS)
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
macsec_encrypt_finish(skb, dev);
len = skb->len;
ret = dev_queue_xmit(skb);
count_tx(dev, ret, len);
return ret;
}
#define SW_MACSEC_FEATURES \
(NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
/* If h/w offloading is enabled, use real device features save for
* VLAN_FEATURES - they require additional ops
* HW_MACSEC - no reason to report it
*/
#define REAL_DEV_FEATURES(dev) \
((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC))
static int macsec_dev_init(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
int err;
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
err = gro_cells_init(&macsec->gro_cells, dev);
if (err) {
free_percpu(dev->tstats);
return err;
}
if (macsec_is_offloaded(macsec)) {
dev->features = REAL_DEV_FEATURES(real_dev);
} else {
dev->features = real_dev->features & SW_MACSEC_FEATURES;
dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
}
dev->needed_headroom = real_dev->needed_headroom +
MACSEC_NEEDED_HEADROOM;
dev->needed_tailroom = real_dev->needed_tailroom +
MACSEC_NEEDED_TAILROOM;
if (is_zero_ether_addr(dev->dev_addr))
eth_hw_addr_inherit(dev, real_dev);
if (is_zero_ether_addr(dev->broadcast))
memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
return 0;
}
static void macsec_dev_uninit(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
gro_cells_destroy(&macsec->gro_cells);
free_percpu(dev->tstats);
}
static netdev_features_t macsec_fix_features(struct net_device *dev,
netdev_features_t features)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
if (macsec_is_offloaded(macsec))
return REAL_DEV_FEATURES(real_dev);
features &= (real_dev->features & SW_MACSEC_FEATURES) |
NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
features |= NETIF_F_LLTX;
return features;
}
static int macsec_dev_open(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
int err;
err = dev_uc_add(real_dev, dev->dev_addr);
if (err < 0)
return err;
if (dev->flags & IFF_ALLMULTI) {
err = dev_set_allmulti(real_dev, 1);
if (err < 0)
goto del_unicast;
}
if (dev->flags & IFF_PROMISC) {
err = dev_set_promiscuity(real_dev, 1);
if (err < 0)
goto clear_allmulti;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
err = -EOPNOTSUPP;
goto clear_allmulti;
}
ctx.secy = &macsec->secy;
err = macsec_offload(ops->mdo_dev_open, &ctx);
if (err)
goto clear_allmulti;
}
if (netif_carrier_ok(real_dev))
netif_carrier_on(dev);
return 0;
clear_allmulti:
if (dev->flags & IFF_ALLMULTI)
dev_set_allmulti(real_dev, -1);
del_unicast:
dev_uc_del(real_dev, dev->dev_addr);
netif_carrier_off(dev);
return err;
}
static int macsec_dev_stop(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
netif_carrier_off(dev);
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.secy = &macsec->secy;
macsec_offload(ops->mdo_dev_stop, &ctx);
}
}
dev_mc_unsync(real_dev, dev);
dev_uc_unsync(real_dev, dev);
if (dev->flags & IFF_ALLMULTI)
dev_set_allmulti(real_dev, -1);
if (dev->flags & IFF_PROMISC)
dev_set_promiscuity(real_dev, -1);
dev_uc_del(real_dev, dev->dev_addr);
return 0;
}
static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
{
struct net_device *real_dev = macsec_priv(dev)->real_dev;
if (!(dev->flags & IFF_UP))
return;
if (change & IFF_ALLMULTI)
dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
if (change & IFF_PROMISC)
dev_set_promiscuity(real_dev,
dev->flags & IFF_PROMISC ? 1 : -1);
}
static void macsec_dev_set_rx_mode(struct net_device *dev)
{
struct net_device *real_dev = macsec_priv(dev)->real_dev;
dev_mc_sync(real_dev, dev);
dev_uc_sync(real_dev, dev);
}
static int macsec_set_mac_address(struct net_device *dev, void *p)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
struct sockaddr *addr = p;
int err;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
if (!(dev->flags & IFF_UP))
goto out;
err = dev_uc_add(real_dev, addr->sa_data);
if (err < 0)
return err;
dev_uc_del(real_dev, dev->dev_addr);
out:
ether_addr_copy(dev->dev_addr, addr->sa_data);
macsec->secy.sci = dev_to_sci(dev, MACSEC_PORT_ES);
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.secy = &macsec->secy;
macsec_offload(ops->mdo_upd_secy, &ctx);
}
}
return 0;
}
static int macsec_change_mtu(struct net_device *dev, int new_mtu)
{
struct macsec_dev *macsec = macsec_priv(dev);
unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
if (macsec->real_dev->mtu - extra < new_mtu)
return -ERANGE;
dev->mtu = new_mtu;
return 0;
}
static void macsec_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *s)
{
int cpu;
if (!dev->tstats)
return;
for_each_possible_cpu(cpu) {
struct pcpu_sw_netstats *stats;
struct pcpu_sw_netstats tmp;
int start;
stats = per_cpu_ptr(dev->tstats, cpu);
do {
start = u64_stats_fetch_begin_irq(&stats->syncp);
tmp.rx_packets = stats->rx_packets;
tmp.rx_bytes = stats->rx_bytes;
tmp.tx_packets = stats->tx_packets;
tmp.tx_bytes = stats->tx_bytes;
} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
s->rx_packets += tmp.rx_packets;
s->rx_bytes += tmp.rx_bytes;
s->tx_packets += tmp.tx_packets;
s->tx_bytes += tmp.tx_bytes;
}
s->rx_dropped = dev->stats.rx_dropped;
s->tx_dropped = dev->stats.tx_dropped;
}
static int macsec_get_iflink(const struct net_device *dev)
{
return macsec_priv(dev)->real_dev->ifindex;
}
static const struct net_device_ops macsec_netdev_ops = {
.ndo_init = macsec_dev_init,
.ndo_uninit = macsec_dev_uninit,
.ndo_open = macsec_dev_open,
.ndo_stop = macsec_dev_stop,
.ndo_fix_features = macsec_fix_features,
.ndo_change_mtu = macsec_change_mtu,
.ndo_set_rx_mode = macsec_dev_set_rx_mode,
.ndo_change_rx_flags = macsec_dev_change_rx_flags,
.ndo_set_mac_address = macsec_set_mac_address,
.ndo_start_xmit = macsec_start_xmit,
.ndo_get_stats64 = macsec_get_stats64,
.ndo_get_iflink = macsec_get_iflink,
};
static const struct device_type macsec_type = {
.name = "macsec",
};
static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
[IFLA_MACSEC_SCI] = { .type = NLA_U64 },
[IFLA_MACSEC_PORT] = { .type = NLA_U16 },
[IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
[IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
[IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
[IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
[IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
[IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
[IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
[IFLA_MACSEC_ES] = { .type = NLA_U8 },
[IFLA_MACSEC_SCB] = { .type = NLA_U8 },
[IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
[IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
};
static void macsec_free_netdev(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
free_percpu(macsec->stats);
free_percpu(macsec->secy.tx_sc.stats);
}
static void macsec_setup(struct net_device *dev)
{
ether_setup(dev);
dev->min_mtu = 0;
dev->max_mtu = ETH_MAX_MTU;
dev->priv_flags |= IFF_NO_QUEUE;
dev->netdev_ops = &macsec_netdev_ops;
dev->needs_free_netdev = true;
dev->priv_destructor = macsec_free_netdev;
SET_NETDEV_DEVTYPE(dev, &macsec_type);
eth_zero_addr(dev->broadcast);
}
static int macsec_changelink_common(struct net_device *dev,
struct nlattr *data[])
{
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
secy = &macsec_priv(dev)->secy;
tx_sc = &secy->tx_sc;
if (data[IFLA_MACSEC_ENCODING_SA]) {
struct macsec_tx_sa *tx_sa;
tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
secy->operational = tx_sa && tx_sa->active;
}
if (data[IFLA_MACSEC_WINDOW])
secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
if (data[IFLA_MACSEC_ENCRYPT])
tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
if (data[IFLA_MACSEC_PROTECT])
secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
if (data[IFLA_MACSEC_INC_SCI])
tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
if (data[IFLA_MACSEC_ES])
tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
if (data[IFLA_MACSEC_SCB])
tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
if (data[IFLA_MACSEC_REPLAY_PROTECT])
secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
if (data[IFLA_MACSEC_VALIDATION])
secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
if (data[IFLA_MACSEC_CIPHER_SUITE]) {
switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
case MACSEC_CIPHER_ID_GCM_AES_128:
case MACSEC_DEFAULT_CIPHER_ID:
secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
secy->xpn = false;
break;
case MACSEC_CIPHER_ID_GCM_AES_256:
secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
secy->xpn = false;
break;
case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
secy->xpn = true;
break;
case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
secy->xpn = true;
break;
default:
return -EINVAL;
}
}
return 0;
}
static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct macsec_tx_sc tx_sc;
struct macsec_secy secy;
int ret;
if (!data)
return 0;
if (data[IFLA_MACSEC_CIPHER_SUITE] ||
data[IFLA_MACSEC_ICV_LEN] ||
data[IFLA_MACSEC_SCI] ||
data[IFLA_MACSEC_PORT])
return -EINVAL;
/* Keep a copy of unmodified secy and tx_sc, in case the offload
* propagation fails, to revert macsec_changelink_common.
*/
memcpy(&secy, &macsec->secy, sizeof(secy));
memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
ret = macsec_changelink_common(dev, data);
if (ret)
return ret;
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
int ret;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (!ops) {
ret = -EOPNOTSUPP;
goto cleanup;
}
ctx.secy = &macsec->secy;
ret = macsec_offload(ops->mdo_upd_secy, &ctx);
if (ret)
goto cleanup;
}
return 0;
cleanup:
memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
memcpy(&macsec->secy, &secy, sizeof(secy));
return ret;
}
static void macsec_del_dev(struct macsec_dev *macsec)
{
int i;
while (macsec->secy.rx_sc) {
struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
free_rx_sc(rx_sc);
}
for (i = 0; i < MACSEC_NUM_AN; i++) {
struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
if (sa) {
RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
clear_tx_sa(sa);
}
}
}
static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
unregister_netdevice_queue(dev, head);
list_del_rcu(&macsec->secys);
macsec_del_dev(macsec);
netdev_upper_dev_unlink(real_dev, dev);
macsec_generation++;
}
static void macsec_dellink(struct net_device *dev, struct list_head *head)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx);
if (ops) {
ctx.secy = &macsec->secy;
macsec_offload(ops->mdo_del_secy, &ctx);
}
}
macsec_common_dellink(dev, head);
if (list_empty(&rxd->secys)) {
netdev_rx_handler_unregister(real_dev);
kfree(rxd);
}
}
static int register_macsec_dev(struct net_device *real_dev,
struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
if (!rxd) {
int err;
rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
if (!rxd)
return -ENOMEM;
INIT_LIST_HEAD(&rxd->secys);
err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
rxd);
if (err < 0) {
kfree(rxd);
return err;
}
}
list_add_tail_rcu(&macsec->secys, &rxd->secys);
return 0;
}
static bool sci_exists(struct net_device *dev, sci_t sci)
{
struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
struct macsec_dev *macsec;
list_for_each_entry(macsec, &rxd->secys, secys) {
if (macsec->secy.sci == sci)
return true;
}
return false;
}
static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct macsec_secy *secy = &macsec->secy;
macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
if (!macsec->stats)
return -ENOMEM;
secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
if (!secy->tx_sc.stats) {
free_percpu(macsec->stats);
return -ENOMEM;
}
if (sci == MACSEC_UNDEF_SCI)
sci = dev_to_sci(dev, MACSEC_PORT_ES);
secy->netdev = dev;
secy->operational = true;
secy->key_len = DEFAULT_SAK_LEN;
secy->icv_len = icv_len;
secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
secy->protect_frames = true;
secy->replay_protect = false;
secy->xpn = DEFAULT_XPN;
secy->sci = sci;
secy->tx_sc.active = true;
secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
secy->tx_sc.end_station = false;
secy->tx_sc.scb = false;
return 0;
}
static struct lock_class_key macsec_netdev_addr_lock_key;
static int macsec_newlink(struct net *net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct macsec_dev *macsec = macsec_priv(dev);
rx_handler_func_t *rx_handler;
u8 icv_len = DEFAULT_ICV_LEN;
struct net_device *real_dev;
int err, mtu;
sci_t sci;
if (!tb[IFLA_LINK])
return -EINVAL;
real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
if (!real_dev)
return -ENODEV;
if (real_dev->type != ARPHRD_ETHER)
return -EINVAL;
dev->priv_flags |= IFF_MACSEC;
macsec->real_dev = real_dev;
if (data && data[IFLA_MACSEC_OFFLOAD])
macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
else
/* MACsec offloading is off by default */
macsec->offload = MACSEC_OFFLOAD_OFF;
/* Check if the offloading mode is supported by the underlying layers */
if (macsec->offload != MACSEC_OFFLOAD_OFF &&
!macsec_check_offload(macsec->offload, macsec))
return -EOPNOTSUPP;
if (data && data[IFLA_MACSEC_ICV_LEN])
icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
if (mtu < 0)
dev->mtu = 0;
else
dev->mtu = mtu;
rx_handler = rtnl_dereference(real_dev->rx_handler);
if (rx_handler && rx_handler != macsec_handle_frame)
return -EBUSY;
err = register_netdevice(dev);
if (err < 0)
return err;
netdev_lockdep_set_classes(dev);
lockdep_set_class_and_subclass(&dev->addr_list_lock,
&macsec_netdev_addr_lock_key,
dev->lower_level);
err = netdev_upper_dev_link(real_dev, dev, extack);
if (err < 0)
goto unregister;
/* need to be already registered so that ->init has run and
* the MAC addr is set
*/
if (data && data[IFLA_MACSEC_SCI])
sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
else if (data && data[IFLA_MACSEC_PORT])
sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
else
sci = dev_to_sci(dev, MACSEC_PORT_ES);
if (rx_handler && sci_exists(real_dev, sci)) {
err = -EBUSY;
goto unlink;
}
err = macsec_add_dev(dev, sci, icv_len);
if (err)
goto unlink;
if (data) {
err = macsec_changelink_common(dev, data);
if (err)
goto del_dev;
}
/* If h/w offloading is available, propagate to the device */
if (macsec_is_offloaded(macsec)) {
const struct macsec_ops *ops;
struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx);
if (ops) {
ctx.secy = &macsec->secy;
err = macsec_offload(ops->mdo_add_secy, &ctx);
if (err)
goto del_dev;
}
}
err = register_macsec_dev(real_dev, dev);
if (err < 0)
goto del_dev;
netif_stacked_transfer_operstate(real_dev, dev);
linkwatch_fire_event(dev);
macsec_generation++;
return 0;
del_dev:
macsec_del_dev(macsec);
unlink:
netdev_upper_dev_unlink(real_dev, dev);
unregister:
unregister_netdevice(dev);
return err;
}
static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
u64 csid = MACSEC_DEFAULT_CIPHER_ID;
u8 icv_len = DEFAULT_ICV_LEN;
int flag;
bool es, scb, sci;
if (!data)
return 0;
if (data[IFLA_MACSEC_CIPHER_SUITE])
csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
if (data[IFLA_MACSEC_ICV_LEN]) {
icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
if (icv_len != DEFAULT_ICV_LEN) {
char dummy_key[DEFAULT_SAK_LEN] = { 0 };
struct crypto_aead *dummy_tfm;
dummy_tfm = macsec_alloc_tfm(dummy_key,
DEFAULT_SAK_LEN,
icv_len);
if (IS_ERR(dummy_tfm))
return PTR_ERR(dummy_tfm);
crypto_free_aead(dummy_tfm);
}
}
switch (csid) {
case MACSEC_CIPHER_ID_GCM_AES_128:
case MACSEC_CIPHER_ID_GCM_AES_256:
case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
case MACSEC_DEFAULT_CIPHER_ID:
if (icv_len < MACSEC_MIN_ICV_LEN ||
icv_len > MACSEC_STD_ICV_LEN)
return -EINVAL;
break;
default:
return -EINVAL;
}
if (data[IFLA_MACSEC_ENCODING_SA]) {
if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
return -EINVAL;
}
for (flag = IFLA_MACSEC_ENCODING_SA + 1;
flag < IFLA_MACSEC_VALIDATION;
flag++) {
if (data[flag]) {
if (nla_get_u8(data[flag]) > 1)
return -EINVAL;
}
}
es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
if ((sci && (scb || es)) || (scb && es))
return -EINVAL;
if (data[IFLA_MACSEC_VALIDATION] &&
nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
return -EINVAL;
if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
!data[IFLA_MACSEC_WINDOW])
return -EINVAL;
return 0;
}
static struct net *macsec_get_link_net(const struct net_device *dev)
{
return dev_net(macsec_priv(dev)->real_dev);
}
static size_t macsec_get_size(const struct net_device *dev)
{
return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
nla_total_size(1) + /* IFLA_MACSEC_ES */
nla_total_size(1) + /* IFLA_MACSEC_SCB */
nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
0;
}
static int macsec_fill_info(struct sk_buff *skb,
const struct net_device *dev)
{
struct macsec_secy *secy = &macsec_priv(dev)->secy;
struct macsec_tx_sc *tx_sc = &secy->tx_sc;
u64 csid;
switch (secy->key_len) {
case MACSEC_GCM_AES_128_SAK_LEN:
csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
break;
case MACSEC_GCM_AES_256_SAK_LEN:
csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
break;
default:
goto nla_put_failure;
}
if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
IFLA_MACSEC_PAD) ||
nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
csid, IFLA_MACSEC_PAD) ||
nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
0)
goto nla_put_failure;
if (secy->replay_protect) {
if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
goto nla_put_failure;
}
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static struct rtnl_link_ops macsec_link_ops __read_mostly = {
.kind = "macsec",
.priv_size = sizeof(struct macsec_dev),
.maxtype = IFLA_MACSEC_MAX,
.policy = macsec_rtnl_policy,
.setup = macsec_setup,
.validate = macsec_validate_attr,
.newlink = macsec_newlink,
.changelink = macsec_changelink,
.dellink = macsec_dellink,
.get_size = macsec_get_size,
.fill_info = macsec_fill_info,
.get_link_net = macsec_get_link_net,
};
static bool is_macsec_master(struct net_device *dev)
{
return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
}
static int macsec_notify(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
LIST_HEAD(head);
if (!is_macsec_master(real_dev))
return NOTIFY_DONE;
switch (event) {
case NETDEV_DOWN:
case NETDEV_UP:
case NETDEV_CHANGE: {
struct macsec_dev *m, *n;
struct macsec_rxh_data *rxd;
rxd = macsec_data_rtnl(real_dev);
list_for_each_entry_safe(m, n, &rxd->secys, secys) {
struct net_device *dev = m->secy.netdev;
netif_stacked_transfer_operstate(real_dev, dev);
}
break;
}
case NETDEV_UNREGISTER: {
struct macsec_dev *m, *n;
struct macsec_rxh_data *rxd;
rxd = macsec_data_rtnl(real_dev);
list_for_each_entry_safe(m, n, &rxd->secys, secys) {
macsec_common_dellink(m->secy.netdev, &head);
}
netdev_rx_handler_unregister(real_dev);
kfree(rxd);
unregister_netdevice_many(&head);
break;
}
case NETDEV_CHANGEMTU: {
struct macsec_dev *m;
struct macsec_rxh_data *rxd;
rxd = macsec_data_rtnl(real_dev);
list_for_each_entry(m, &rxd->secys, secys) {
struct net_device *dev = m->secy.netdev;
unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
macsec_extra_len(true));
if (dev->mtu > mtu)
dev_set_mtu(dev, mtu);
}
}
}
return NOTIFY_OK;
}
static struct notifier_block macsec_notifier = {
.notifier_call = macsec_notify,
};
static int __init macsec_init(void)
{
int err;
pr_info("MACsec IEEE 802.1AE\n");
err = register_netdevice_notifier(&macsec_notifier);
if (err)
return err;
err = rtnl_link_register(&macsec_link_ops);
if (err)
goto notifier;
err = genl_register_family(&macsec_fam);
if (err)
goto rtnl;
return 0;
rtnl:
rtnl_link_unregister(&macsec_link_ops);
notifier:
unregister_netdevice_notifier(&macsec_notifier);
return err;
}
static void __exit macsec_exit(void)
{
genl_unregister_family(&macsec_fam);
rtnl_link_unregister(&macsec_link_ops);
unregister_netdevice_notifier(&macsec_notifier);
rcu_barrier();
}
module_init(macsec_init);
module_exit(macsec_exit);
MODULE_ALIAS_RTNL_LINK("macsec");
MODULE_ALIAS_GENL_FAMILY("macsec");
MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
MODULE_LICENSE("GPL v2");
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