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e0f841f5cb
linux/drivers/net/macsec.c
Tobias Brunner e0f841f5cb macsec: Fix header length if SCI is added if explicitly disabled 
Even if sending SCIs is explicitly disabled, the code that creates the
Security Tag might still decide to add it (e.g. if multiple RX SCs are
defined on the MACsec interface).
But because the header length so far only depended on the configuration
option the SCI overwrote the original frame's contents (EtherType and
e.g. the beginning of the IP header) and if encrypted did not visibly
end up in the packet, while the SC flag in the TCI field of the Security
Tag was still set, resulting in invalid MACsec frames.

Fixes: c09440f7dc ("macsec: introduce IEEE 802.1AE driver")
Signed-off-by: Tobias Brunner <tobias@strongswan.org>
Acked-by: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-10-27 16:21:00 -04:00

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/*
* drivers/net/macsec.c - MACsec device
*
* Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#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/rtnetlink.h>
#include <net/genetlink.h>
#include <net/sock.h>
#include <net/gro_cells.h>
#include <uapi/linux/if_macsec.h>
typedef u64 __bitwise sci_t;
#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 MACSEC_NUM_AN 4 /* 2 bits for the association number */
#define for_each_rxsc(secy, sc) \
for (sc = rcu_dereference_bh(secy->rx_sc); \
sc; \
sc = rcu_dereference_bh(sc->next))
#define for_each_rxsc_rtnl(secy, sc) \
for (sc = rtnl_dereference(secy->rx_sc); \
sc; \
sc = rtnl_dereference(sc->next))
struct gcm_iv {
union {
u8 secure_channel_id[8];
sci_t sci;
};
__be32 pn;
};
/**
* struct macsec_key - SA key
* @id: user-provided key identifier
* @tfm: crypto struct, key storage
*/
struct macsec_key {
u8 id[MACSEC_KEYID_LEN];
struct crypto_aead *tfm;
};
struct macsec_rx_sc_stats {
__u64 InOctetsValidated;
__u64 InOctetsDecrypted;
__u64 InPktsUnchecked;
__u64 InPktsDelayed;
__u64 InPktsOK;
__u64 InPktsInvalid;
__u64 InPktsLate;
__u64 InPktsNotValid;
__u64 InPktsNotUsingSA;
__u64 InPktsUnusedSA;
};
struct macsec_rx_sa_stats {
__u32 InPktsOK;
__u32 InPktsInvalid;
__u32 InPktsNotValid;
__u32 InPktsNotUsingSA;
__u32 InPktsUnusedSA;
};
struct macsec_tx_sa_stats {
__u32 OutPktsProtected;
__u32 OutPktsEncrypted;
};
struct macsec_tx_sc_stats {
__u64 OutPktsProtected;
__u64 OutPktsEncrypted;
__u64 OutOctetsProtected;
__u64 OutOctetsEncrypted;
};
struct macsec_dev_stats {
__u64 OutPktsUntagged;
__u64 InPktsUntagged;
__u64 OutPktsTooLong;
__u64 InPktsNoTag;
__u64 InPktsBadTag;
__u64 InPktsUnknownSCI;
__u64 InPktsNoSCI;
__u64 InPktsOverrun;
};
/**
* struct macsec_rx_sa - receive secure association
* @active:
* @next_pn: packet number expected for the next packet
* @lock: protects next_pn manipulations
* @key: key structure
* @stats: per-SA stats
*/
struct macsec_rx_sa {
struct macsec_key key;
spinlock_t lock;
u32 next_pn;
atomic_t refcnt;
bool active;
struct macsec_rx_sa_stats __percpu *stats;
struct macsec_rx_sc *sc;
struct rcu_head rcu;
};
struct pcpu_rx_sc_stats {
struct macsec_rx_sc_stats stats;
struct u64_stats_sync syncp;
};
/**
* struct macsec_rx_sc - receive secure channel
* @sci: secure channel identifier for this SC
* @active: channel is active
* @sa: array of secure associations
* @stats: per-SC stats
*/
struct macsec_rx_sc {
struct macsec_rx_sc __rcu *next;
sci_t sci;
bool active;
struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
struct pcpu_rx_sc_stats __percpu *stats;
atomic_t refcnt;
struct rcu_head rcu_head;
};
/**
* struct macsec_tx_sa - transmit secure association
* @active:
* @next_pn: packet number to use for the next packet
* @lock: protects next_pn manipulations
* @key: key structure
* @stats: per-SA stats
*/
struct macsec_tx_sa {
struct macsec_key key;
spinlock_t lock;
u32 next_pn;
atomic_t refcnt;
bool active;
struct macsec_tx_sa_stats __percpu *stats;
struct rcu_head rcu;
};
struct pcpu_tx_sc_stats {
struct macsec_tx_sc_stats stats;
struct u64_stats_sync syncp;
};
/**
* struct macsec_tx_sc - transmit secure channel
* @active:
* @encoding_sa: association number of the SA currently in use
* @encrypt: encrypt packets on transmit, or authenticate only
* @send_sci: always include the SCI in the SecTAG
* @end_station:
* @scb: single copy broadcast flag
* @sa: array of secure associations
* @stats: stats for this TXSC
*/
struct macsec_tx_sc {
bool active;
u8 encoding_sa;
bool encrypt;
bool send_sci;
bool end_station;
bool scb;
struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
struct pcpu_tx_sc_stats __percpu *stats;
};
#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
/**
* struct macsec_secy - MACsec Security Entity
* @netdev: netdevice for this SecY
* @n_rx_sc: number of receive secure channels configured on this SecY
* @sci: secure channel identifier used for tx
* @key_len: length of keys used by the cipher suite
* @icv_len: length of ICV used by the cipher suite
* @validate_frames: validation mode
* @operational: MAC_Operational flag
* @protect_frames: enable protection for this SecY
* @replay_protect: enable packet number checks on receive
* @replay_window: size of the replay window
* @tx_sc: transmit secure channel
* @rx_sc: linked list of receive secure channels
*/
struct macsec_secy {
struct net_device *netdev;
unsigned int n_rx_sc;
sci_t sci;
u16 key_len;
u16 icv_len;
enum macsec_validation_type validate_frames;
bool operational;
bool protect_frames;
bool replay_protect;
u32 replay_window;
struct macsec_tx_sc tx_sc;
struct macsec_rx_sc __rcu *rx_sc;
};
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
*/
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;
unsigned int nest_level;
};
/**
* 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 (!atomic_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 atomic_inc_not_zero(&sc->refcnt) ? sc : NULL;
}
static void macsec_rxsc_put(struct macsec_rx_sc *sc)
{
if (atomic_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 (atomic_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 (!atomic_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 (atomic_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 DEFAULT_SAK_LEN 16
#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;
}
/* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
{
struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
int len = skb->len - 2 * ETH_ALEN;
int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
/* a) It comprises at least 17 octets */
if (skb->len <= 16)
return false;
/* b) MACsec EtherType: already checked */
/* c) V bit is clear */
if (h->tci_an & MACSEC_TCI_VERSION)
return false;
/* d) ES or SCB => !SC */
if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
(h->tci_an & MACSEC_TCI_SC))
return false;
/* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
if (h->unused)
return false;
/* rx.pn != 0 (figure 10-5) */
if (!h->packet_number)
return false;
/* length check, f) g) h) i) */
if (h->short_length)
return len == extra_len + h->short_length;
return len >= extra_len + MIN_NON_SHORT_LEN;
}
#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
{
struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
gcm_iv->sci = sci;
gcm_iv->pn = htonl(pn);
}
static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
{
return (struct macsec_eth_header *)skb_mac_header(skb);
}
static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
{
u32 pn;
spin_lock_bh(&tx_sa->lock);
pn = tx_sa->next_pn;
tx_sa->next_pn++;
if (tx_sa->next_pn == 0) {
pr_debug("PN wrapped, transitioning to !oper\n");
tx_sa->active = false;
if (secy->protect_frames)
secy->operational = false;
}
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);
} else {
dev->stats.tx_dropped++;
}
}
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)
{
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) * (MAX_SKB_FRAGS + 1);
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;
unsigned char *iv;
struct ethhdr *eth;
struct macsec_eth_header *hh;
size_t unprotected_len;
struct aead_request *req;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
struct macsec_dev *macsec = macsec_priv(dev);
bool sci_present;
u32 pn;
secy = &macsec->secy;
tx_sc = &secy->tx_sc;
/* 10.5.1 TX SA assignment */
tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
if (!tx_sa) {
secy->operational = false;
kfree_skb(skb);
return ERR_PTR(-EINVAL);
}
if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
struct sk_buff *nskb = skb_copy_expand(skb,
MACSEC_NEEDED_HEADROOM,
MACSEC_NEEDED_TAILROOM,
GFP_ATOMIC);
if (likely(nskb)) {
consume_skb(skb);
skb = nskb;
} else {
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-ENOMEM);
}
} else {
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb) {
macsec_txsa_put(tx_sa);
return ERR_PTR(-ENOMEM);
}
}
unprotected_len = skb->len;
eth = eth_hdr(skb);
sci_present = send_sci(secy);
hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(sci_present));
memmove(hh, eth, 2 * ETH_ALEN);
pn = tx_sa_update_pn(tx_sa, secy);
if (pn == 0) {
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-ENOLINK);
}
macsec_fill_sectag(hh, secy, pn, sci_present);
macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
skb_put(skb, secy->icv_len);
if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.OutPktsTooLong++;
u64_stats_update_end(&secy_stats->syncp);
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-EINVAL);
}
req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg);
if (!req) {
macsec_txsa_put(tx_sa);
kfree_skb(skb);
return ERR_PTR(-ENOMEM);
}
macsec_fill_iv(iv, secy->sci, pn);
sg_init_table(sg, MAX_SKB_FRAGS + 1);
skb_to_sgvec(skb, sg, 0, skb->len);
if (tx_sc->encrypt) {
int len = skb->len - macsec_hdr_len(sci_present) -
secy->icv_len;
aead_request_set_crypt(req, sg, sg, len, iv);
aead_request_set_ad(req, macsec_hdr_len(sci_present));
} else {
aead_request_set_crypt(req, sg, sg, 0, iv);
aead_request_set_ad(req, skb->len - secy->icv_len);
}
macsec_skb_cb(skb)->req = req;
macsec_skb_cb(skb)->tx_sa = tx_sa;
aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
dev_hold(skb->dev);
ret = crypto_aead_encrypt(req);
if (ret == -EINPROGRESS) {
return ERR_PTR(ret);
} else if (ret != 0) {
dev_put(skb->dev);
kfree_skb(skb);
aead_request_free(req);
macsec_txsa_put(tx_sa);
return ERR_PTR(-EINVAL);
}
dev_put(skb->dev);
aead_request_free(req);
macsec_txsa_put(tx_sa);
return skb;
}
static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
{
struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
struct macsec_eth_header *hdr = macsec_ethhdr(skb);
u32 lowest_pn = 0;
spin_lock(&rx_sa->lock);
if (rx_sa->next_pn >= secy->replay_window)
lowest_pn = rx_sa->next_pn - secy->replay_window;
/* Now perform replay protection check again
* (see IEEE 802.1AE-2006 figure 10-5)
*/
if (secy->replay_protect && pn < lowest_pn) {
spin_unlock(&rx_sa->lock);
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsLate++;
u64_stats_update_end(&rxsc_stats->syncp);
return false;
}
if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
u64_stats_update_begin(&rxsc_stats->syncp);
if (hdr->tci_an & MACSEC_TCI_E)
rxsc_stats->stats.InOctetsDecrypted += skb->len;
else
rxsc_stats->stats.InOctetsValidated += skb->len;
u64_stats_update_end(&rxsc_stats->syncp);
}
if (!macsec_skb_cb(skb)->valid) {
spin_unlock(&rx_sa->lock);
/* 10.6.5 */
if (hdr->tci_an & MACSEC_TCI_C ||
secy->validate_frames == MACSEC_VALIDATE_STRICT) {
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsNotValid++;
u64_stats_update_end(&rxsc_stats->syncp);
return false;
}
u64_stats_update_begin(&rxsc_stats->syncp);
if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
rxsc_stats->stats.InPktsInvalid++;
this_cpu_inc(rx_sa->stats->InPktsInvalid);
} else if (pn < lowest_pn) {
rxsc_stats->stats.InPktsDelayed++;
} else {
rxsc_stats->stats.InPktsUnchecked++;
}
u64_stats_update_end(&rxsc_stats->syncp);
} else {
u64_stats_update_begin(&rxsc_stats->syncp);
if (pn < lowest_pn) {
rxsc_stats->stats.InPktsDelayed++;
} else {
rxsc_stats->stats.InPktsOK++;
this_cpu_inc(rx_sa->stats->InPktsOK);
}
u64_stats_update_end(&rxsc_stats->syncp);
if (pn >= rx_sa->next_pn)
rx_sa->next_pn = pn + 1;
spin_unlock(&rx_sa->lock);
}
return true;
}
static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
{
skb->pkt_type = PACKET_HOST;
skb->protocol = eth_type_trans(skb, dev);
skb_reset_network_header(skb);
if (!skb_transport_header_was_set(skb))
skb_reset_transport_header(skb);
skb_reset_mac_len(skb);
}
static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
{
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, ret;
u32 pn;
aead_request_free(macsec_skb_cb(skb)->req);
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;
ret = gro_cells_receive(&macsec->gro_cells, skb);
if (ret == NET_RX_SUCCESS)
count_rx(dev, len);
else
macsec->secy.netdev->stats.rx_dropped++;
rcu_read_unlock_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;
unsigned char *iv;
struct aead_request *req;
struct macsec_eth_header *hdr;
u16 icv_len = secy->icv_len;
macsec_skb_cb(skb)->valid = false;
skb = skb_share_check(skb, GFP_ATOMIC);
if (!skb)
return ERR_PTR(-ENOMEM);
req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg);
if (!req) {
kfree_skb(skb);
return ERR_PTR(-ENOMEM);
}
hdr = (struct macsec_eth_header *)skb->data;
macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
sg_init_table(sg, MAX_SKB_FRAGS + 1);
skb_to_sgvec(skb, sg, 0, skb->len);
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 void handle_not_macsec(struct sk_buff *skb)
{
struct macsec_rxh_data *rxd;
struct macsec_dev *macsec;
rcu_read_lock();
rxd = macsec_data_rcu(skb->dev);
/* 10.6 If the management control validateFrames is not
* Strict, frames without a SecTAG are received, counted, and
* delivered to the Controlled Port
*/
list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
struct sk_buff *nskb;
int ret;
struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
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 = macsec->secy.netdev;
ret = netif_rx(nskb);
if (ret == NET_RX_SUCCESS) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsUntagged++;
u64_stats_update_end(&secy_stats->syncp);
} else {
macsec->secy.netdev->stats.rx_dropped++;
}
}
rcu_read_unlock();
}
static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
{
struct sk_buff *skb = *pskb;
struct net_device *dev = skb->dev;
struct macsec_eth_header *hdr;
struct macsec_secy *secy = NULL;
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
struct macsec_rxh_data *rxd;
struct macsec_dev *macsec;
sci_t sci;
u32 pn;
bool cbit;
struct pcpu_rx_sc_stats *rxsc_stats;
struct pcpu_secy_stats *secy_stats;
bool pulled_sci;
int ret;
if (skb_headroom(skb) < ETH_HLEN)
goto drop_direct;
hdr = macsec_ethhdr(skb);
if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
handle_not_macsec(skb);
/* and deliver to the uncontrolled port */
return RX_HANDLER_PASS;
}
skb = skb_unshare(skb, GFP_ATOMIC);
if (!skb) {
*pskb = NULL;
return RX_HANDLER_CONSUMED;
}
pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
if (!pulled_sci) {
if (!pskb_may_pull(skb, macsec_extra_len(false)))
goto drop_direct;
}
hdr = macsec_ethhdr(skb);
/* Frames with a SecTAG that has the TCI E bit set but the C
* bit clear are discarded, as this reserved encoding is used
* to identify frames with a SecTAG that are not to be
* delivered to the Controlled Port.
*/
if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
return RX_HANDLER_PASS;
/* now, pull the extra length */
if (hdr->tci_an & MACSEC_TCI_SC) {
if (!pulled_sci)
goto drop_direct;
}
/* ethernet header is part of crypto processing */
skb_push(skb, ETH_HLEN);
macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
rcu_read_lock();
rxd = macsec_data_rcu(skb->dev);
list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
sc = sc ? macsec_rxsc_get(sc) : NULL;
if (sc) {
secy = &macsec->secy;
rx_sc = sc;
break;
}
}
if (!secy)
goto nosci;
dev = secy->netdev;
macsec = macsec_priv(dev);
secy_stats = this_cpu_ptr(macsec->stats);
rxsc_stats = this_cpu_ptr(rx_sc->stats);
if (!macsec_validate_skb(skb, secy->icv_len)) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsBadTag++;
u64_stats_update_end(&secy_stats->syncp);
goto drop_nosa;
}
rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
if (!rx_sa) {
/* 10.6.1 if the SA is not in use */
/* If validateFrames is Strict or the C bit in the
* SecTAG is set, discard
*/
if (hdr->tci_an & MACSEC_TCI_C ||
secy->validate_frames == MACSEC_VALIDATE_STRICT) {
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsNotUsingSA++;
u64_stats_update_end(&rxsc_stats->syncp);
goto drop_nosa;
}
/* not Strict, the frame (with the SecTAG and ICV
* removed) is delivered to the Controlled Port.
*/
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsUnusedSA++;
u64_stats_update_end(&rxsc_stats->syncp);
goto deliver;
}
/* First, PN check to avoid decrypting obviously wrong packets */
pn = ntohl(hdr->packet_number);
if (secy->replay_protect) {
bool late;
spin_lock(&rx_sa->lock);
late = rx_sa->next_pn >= secy->replay_window &&
pn < (rx_sa->next_pn - secy->replay_window);
spin_unlock(&rx_sa->lock);
if (late) {
u64_stats_update_begin(&rxsc_stats->syncp);
rxsc_stats->stats.InPktsLate++;
u64_stats_update_end(&rxsc_stats->syncp);
goto drop;
}
}
macsec_skb_cb(skb)->rx_sa = rx_sa;
/* Disabled && !changed text => skip validation */
if (hdr->tci_an & MACSEC_TCI_C ||
secy->validate_frames != MACSEC_VALIDATE_DISABLED)
skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
if (IS_ERR(skb)) {
/* the decrypt callback needs the reference */
if (PTR_ERR(skb) != -EINPROGRESS) {
macsec_rxsa_put(rx_sa);
macsec_rxsc_put(rx_sc);
}
rcu_read_unlock();
*pskb = NULL;
return RX_HANDLER_CONSUMED;
}
if (!macsec_post_decrypt(skb, secy, pn))
goto drop;
deliver:
macsec_finalize_skb(skb, secy->icv_len,
macsec_extra_len(macsec_skb_cb(skb)->has_sci));
macsec_reset_skb(skb, secy->netdev);
if (rx_sa)
macsec_rxsa_put(rx_sa);
macsec_rxsc_put(rx_sc);
ret = gro_cells_receive(&macsec->gro_cells, skb);
if (ret == NET_RX_SUCCESS)
count_rx(dev, skb->len);
else
macsec->secy.netdev->stats.rx_dropped++;
rcu_read_unlock();
*pskb = NULL;
return RX_HANDLER_CONSUMED;
drop:
macsec_rxsa_put(rx_sa);
drop_nosa:
macsec_rxsc_put(rx_sc);
rcu_read_unlock();
drop_direct:
kfree_skb(skb);
*pskb = NULL;
return RX_HANDLER_CONSUMED;
nosci:
/* 10.6.1 if the SC is not found */
cbit = !!(hdr->tci_an & MACSEC_TCI_C);
if (!cbit)
macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
macsec_extra_len(macsec_skb_cb(skb)->has_sci));
list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
struct sk_buff *nskb;
secy_stats = this_cpu_ptr(macsec->stats);
/* If validateFrames is Strict or the C bit in the
* SecTAG is set, discard
*/
if (cbit ||
macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsNoSCI++;
u64_stats_update_end(&secy_stats->syncp);
continue;
}
/* not strict, the frame (with the SecTAG and ICV
* removed) is delivered to the Controlled Port.
*/
nskb = skb_clone(skb, GFP_ATOMIC);
if (!nskb)
break;
macsec_reset_skb(nskb, macsec->secy.netdev);
ret = netif_rx(nskb);
if (ret == NET_RX_SUCCESS) {
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.InPktsUnknownSCI++;
u64_stats_update_end(&secy_stats->syncp);
} else {
macsec->secy.netdev->stats.rx_dropped++;
}
}
rcu_read_unlock();
*pskb = skb;
return RX_HANDLER_PASS;
}
static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
{
struct crypto_aead *tfm;
int ret;
tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
if (IS_ERR(tfm))
return tfm;
ret = crypto_aead_setkey(tfm, key, key_len);
if (ret < 0)
goto fail;
ret = crypto_aead_setauthsize(tfm, icv_len);
if (ret < 0)
goto fail;
return tfm;
fail:
crypto_free_aead(tfm);
return ERR_PTR(ret);
}
static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
int icv_len)
{
rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
if (!rx_sa->stats)
return -ENOMEM;
rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
if (IS_ERR(rx_sa->key.tfm)) {
free_percpu(rx_sa->stats);
return PTR_ERR(rx_sa->key.tfm);
}
rx_sa->active = false;
rx_sa->next_pn = 1;
atomic_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;
atomic_set(&rx_sc->refcnt, 1);
secy = &macsec_priv(dev)->secy;
rcu_assign_pointer(rx_sc->next, secy->rx_sc);
rcu_assign_pointer(secy->rx_sc, rx_sc);
if (rx_sc->active)
secy->n_rx_sc++;
return rx_sc;
}
static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
int icv_len)
{
tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
if (!tx_sa->stats)
return -ENOMEM;
tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
if (IS_ERR(tx_sa->key.tfm)) {
free_percpu(tx_sa->stats);
return PTR_ERR(tx_sa->key.tfm);
}
tx_sa->active = false;
atomic_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 = {
.id = GENL_ID_GENERATE,
.name = MACSEC_GENL_NAME,
.hdrsize = 0,
.version = MACSEC_GENL_VERSION,
.maxattr = MACSEC_ATTR_MAX,
.netnsok = true,
};
static struct net_device *get_dev_from_nl(struct net *net,
struct nlattr **attrs)
{
int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
struct net_device *dev;
dev = __dev_get_by_index(net, ifindex);
if (!dev)
return ERR_PTR(-ENODEV);
if (!netif_is_macsec(dev))
return ERR_PTR(-ENODEV);
return dev;
}
static sci_t nla_get_sci(const struct nlattr *nla)
{
return (__force sci_t)nla_get_u64(nla);
}
static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
int padattr)
{
return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
}
static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
struct nlattr **attrs,
struct nlattr **tb_sa,
struct net_device **devp,
struct macsec_secy **secyp,
struct macsec_tx_sc **scp,
u8 *assoc_num)
{
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
if (!tb_sa[MACSEC_SA_ATTR_AN])
return ERR_PTR(-EINVAL);
*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
dev = get_dev_from_nl(net, attrs);
if (IS_ERR(dev))
return ERR_CAST(dev);
if (*assoc_num >= MACSEC_NUM_AN)
return ERR_PTR(-EINVAL);
secy = &macsec_priv(dev)->secy;
tx_sc = &secy->tx_sc;
tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
if (!tx_sa)
return ERR_PTR(-ENODEV);
*devp = dev;
*scp = tx_sc;
*secyp = secy;
return tx_sa;
}
static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
struct nlattr **attrs,
struct nlattr **tb_rxsc,
struct net_device **devp,
struct macsec_secy **secyp)
{
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
sci_t sci;
dev = get_dev_from_nl(net, attrs);
if (IS_ERR(dev))
return ERR_CAST(dev);
secy = &macsec_priv(dev)->secy;
if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
return ERR_PTR(-EINVAL);
sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
rx_sc = find_rx_sc_rtnl(secy, sci);
if (!rx_sc)
return ERR_PTR(-ENODEV);
*secyp = secy;
*devp = dev;
return rx_sc;
}
static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
struct nlattr **attrs,
struct nlattr **tb_rxsc,
struct nlattr **tb_sa,
struct net_device **devp,
struct macsec_secy **secyp,
struct macsec_rx_sc **scp,
u8 *assoc_num)
{
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
if (!tb_sa[MACSEC_SA_ATTR_AN])
return ERR_PTR(-EINVAL);
*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
if (*assoc_num >= MACSEC_NUM_AN)
return ERR_PTR(-EINVAL);
rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
if (IS_ERR(rx_sc))
return ERR_CAST(rx_sc);
rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
if (!rx_sa)
return ERR_PTR(-ENODEV);
*scp = rx_sc;
return rx_sa;
}
static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
[MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
[MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
[MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
};
static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
[MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
[MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
};
static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
[MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
[MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
[MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
[MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
.len = MACSEC_KEYID_LEN, },
[MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
.len = MACSEC_MAX_KEY_LEN, },
};
static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
{
if (!attrs[MACSEC_ATTR_SA_CONFIG])
return -EINVAL;
if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
macsec_genl_sa_policy))
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(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
macsec_genl_rxsc_policy))
return -EINVAL;
return 0;
}
static bool validate_add_rxsa(struct nlattr **attrs)
{
if (!attrs[MACSEC_SA_ATTR_AN] ||
!attrs[MACSEC_SA_ATTR_KEY] ||
!attrs[MACSEC_SA_ATTR_KEYID])
return false;
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;
if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;
if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
return false;
}
if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
return false;
return true;
}
static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
struct nlattr **attrs = info->attrs;
struct macsec_secy *secy;
struct macsec_rx_sc *rx_sc;
struct macsec_rx_sa *rx_sa;
unsigned char assoc_num;
struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
int err;
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (!validate_add_rxsa(tb_sa))
return -EINVAL;
rtnl_lock();
rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
if (IS_ERR(rx_sc)) {
rtnl_unlock();
return PTR_ERR(rx_sc);
}
assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
rtnl_unlock();
return -EINVAL;
}
rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
if (rx_sa) {
rtnl_unlock();
return -EBUSY;
}
rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
if (!rx_sa) {
rtnl_unlock();
return -ENOMEM;
}
err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
secy->key_len, secy->icv_len);
if (err < 0) {
kfree(rx_sa);
rtnl_unlock();
return err;
}
if (tb_sa[MACSEC_SA_ATTR_PN]) {
spin_lock_bh(&rx_sa->lock);
rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&rx_sa->lock);
}
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
rx_sa->sc = rx_sc;
rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
rtnl_unlock();
return 0;
}
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];
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (!validate_add_rxsc(tb_rxsc))
return -EINVAL;
rtnl_lock();
dev = get_dev_from_nl(genl_info_net(info), attrs);
if (IS_ERR(dev)) {
rtnl_unlock();
return PTR_ERR(dev);
}
sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
rx_sc = create_rx_sc(dev, sci);
if (IS_ERR(rx_sc)) {
rtnl_unlock();
return PTR_ERR(rx_sc);
}
if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
rtnl_unlock();
return 0;
}
static bool validate_add_txsa(struct nlattr **attrs)
{
if (!attrs[MACSEC_SA_ATTR_AN] ||
!attrs[MACSEC_SA_ATTR_PN] ||
!attrs[MACSEC_SA_ATTR_KEY] ||
!attrs[MACSEC_SA_ATTR_KEYID])
return false;
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;
if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;
if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
return false;
}
if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
return false;
return true;
}
static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
{
struct net_device *dev;
struct nlattr **attrs = info->attrs;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
unsigned char assoc_num;
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
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;
}
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;
}
nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
spin_lock_bh(&tx_sa->lock);
tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&tx_sa->lock);
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
secy->operational = true;
rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
rtnl_unlock();
return 0;
}
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];
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;
}
RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
clear_rx_sa(rx_sa);
rtnl_unlock();
return 0;
}
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];
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;
}
free_rx_sc(rx_sc);
rtnl_unlock();
return 0;
}
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];
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;
}
RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
clear_tx_sa(tx_sa);
rtnl_unlock();
return 0;
}
static bool validate_upd_sa(struct nlattr **attrs)
{
if (!attrs[MACSEC_SA_ATTR_AN] ||
attrs[MACSEC_SA_ATTR_KEY] ||
attrs[MACSEC_SA_ATTR_KEYID])
return false;
if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
return false;
if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
return false;
if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
return false;
}
return true;
}
static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr **attrs = info->attrs;
struct net_device *dev;
struct macsec_secy *secy;
struct macsec_tx_sc *tx_sc;
struct macsec_tx_sa *tx_sa;
u8 assoc_num;
struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (!validate_upd_sa(tb_sa))
return -EINVAL;
rtnl_lock();
tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
&dev, &secy, &tx_sc, &assoc_num);
if (IS_ERR(tx_sa)) {
rtnl_unlock();
return PTR_ERR(tx_sa);
}
if (tb_sa[MACSEC_SA_ATTR_PN]) {
spin_lock_bh(&tx_sa->lock);
tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&tx_sa->lock);
}
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
if (assoc_num == tx_sc->encoding_sa)
secy->operational = tx_sa->active;
rtnl_unlock();
return 0;
}
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];
if (!attrs[MACSEC_ATTR_IFINDEX])
return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc))
return -EINVAL;
if (parse_sa_config(attrs, tb_sa))
return -EINVAL;
if (!validate_upd_sa(tb_sa))
return -EINVAL;
rtnl_lock();
rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
&dev, &secy, &rx_sc, &assoc_num);
if (IS_ERR(rx_sa)) {
rtnl_unlock();
return PTR_ERR(rx_sa);
}
if (tb_sa[MACSEC_SA_ATTR_PN]) {
spin_lock_bh(&rx_sa->lock);
rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
spin_unlock_bh(&rx_sa->lock);
}
if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
rtnl_unlock();
return 0;
}
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];
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);
}
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;
}
rtnl_unlock();
return 0;
}
static int copy_tx_sa_stats(struct sk_buff *skb,
struct macsec_tx_sa_stats __percpu *pstats)
{
struct macsec_tx_sa_stats sum = {0, };
int cpu;
for_each_possible_cpu(cpu) {
const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
sum.OutPktsProtected += stats->OutPktsProtected;
sum.OutPktsEncrypted += stats->OutPktsEncrypted;
}
if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
return -EMSGSIZE;
return 0;
}
static int copy_rx_sa_stats(struct sk_buff *skb,
struct macsec_rx_sa_stats __percpu *pstats)
{
struct macsec_rx_sa_stats sum = {0, };
int cpu;
for_each_possible_cpu(cpu) {
const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
sum.InPktsOK += stats->InPktsOK;
sum.InPktsInvalid += stats->InPktsInvalid;
sum.InPktsNotValid += stats->InPktsNotValid;
sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
sum.InPktsUnusedSA += stats->InPktsUnusedSA;
}
if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
return -EMSGSIZE;
return 0;
}
static int copy_rx_sc_stats(struct sk_buff *skb,
struct pcpu_rx_sc_stats __percpu *pstats)
{
struct macsec_rx_sc_stats sum = {0, };
int cpu;
for_each_possible_cpu(cpu) {
const struct pcpu_rx_sc_stats *stats;
struct macsec_rx_sc_stats tmp;
unsigned int start;
stats = per_cpu_ptr(pstats, cpu);
do {
start = u64_stats_fetch_begin_irq(&stats->syncp);
memcpy(&tmp, &stats->stats, sizeof(tmp));
} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
sum.InOctetsValidated += tmp.InOctetsValidated;
sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
sum.InPktsUnchecked += tmp.InPktsUnchecked;
sum.InPktsDelayed += tmp.InPktsDelayed;
sum.InPktsOK += tmp.InPktsOK;
sum.InPktsInvalid += tmp.InPktsInvalid;
sum.InPktsLate += tmp.InPktsLate;
sum.InPktsNotValid += tmp.InPktsNotValid;
sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
}
if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
sum.InOctetsValidated,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
sum.InOctetsDecrypted,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
sum.InPktsUnchecked,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
sum.InPktsDelayed,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
sum.InPktsOK,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
sum.InPktsInvalid,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
sum.InPktsLate,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
sum.InPktsNotValid,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
sum.InPktsNotUsingSA,
MACSEC_RXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
sum.InPktsUnusedSA,
MACSEC_RXSC_STATS_ATTR_PAD))
return -EMSGSIZE;
return 0;
}
static int copy_tx_sc_stats(struct sk_buff *skb,
struct pcpu_tx_sc_stats __percpu *pstats)
{
struct macsec_tx_sc_stats sum = {0, };
int cpu;
for_each_possible_cpu(cpu) {
const struct pcpu_tx_sc_stats *stats;
struct macsec_tx_sc_stats tmp;
unsigned int start;
stats = per_cpu_ptr(pstats, cpu);
do {
start = u64_stats_fetch_begin_irq(&stats->syncp);
memcpy(&tmp, &stats->stats, sizeof(tmp));
} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
sum.OutPktsProtected += tmp.OutPktsProtected;
sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
sum.OutOctetsProtected += tmp.OutOctetsProtected;
sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
}
if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
sum.OutPktsProtected,
MACSEC_TXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
sum.OutPktsEncrypted,
MACSEC_TXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
sum.OutOctetsProtected,
MACSEC_TXSC_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
sum.OutOctetsEncrypted,
MACSEC_TXSC_STATS_ATTR_PAD))
return -EMSGSIZE;
return 0;
}
static int copy_secy_stats(struct sk_buff *skb,
struct pcpu_secy_stats __percpu *pstats)
{
struct macsec_dev_stats sum = {0, };
int cpu;
for_each_possible_cpu(cpu) {
const struct pcpu_secy_stats *stats;
struct macsec_dev_stats tmp;
unsigned int start;
stats = per_cpu_ptr(pstats, cpu);
do {
start = u64_stats_fetch_begin_irq(&stats->syncp);
memcpy(&tmp, &stats->stats, sizeof(tmp));
} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
sum.OutPktsUntagged += tmp.OutPktsUntagged;
sum.InPktsUntagged += tmp.InPktsUntagged;
sum.OutPktsTooLong += tmp.OutPktsTooLong;
sum.InPktsNoTag += tmp.InPktsNoTag;
sum.InPktsBadTag += tmp.InPktsBadTag;
sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
sum.InPktsNoSCI += tmp.InPktsNoSCI;
sum.InPktsOverrun += tmp.InPktsOverrun;
}
if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
sum.OutPktsUntagged,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
sum.InPktsUntagged,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
sum.OutPktsTooLong,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
sum.InPktsNoTag,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
sum.InPktsBadTag,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
sum.InPktsUnknownSCI,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
sum.InPktsNoSCI,
MACSEC_SECY_STATS_ATTR_PAD) ||
nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
sum.InPktsOverrun,
MACSEC_SECY_STATS_ATTR_PAD))
return -EMSGSIZE;
return 0;
}
static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
{
struct macsec_tx_sc *tx_sc = &secy->tx_sc;
struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
if (!secy_nest)
return 1;
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,
MACSEC_DEFAULT_CIPHER_ID,
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 int dump_secy(struct macsec_secy *secy, struct net_device *dev,
struct sk_buff *skb, struct netlink_callback *cb)
{
struct macsec_rx_sc *rx_sc;
struct macsec_tx_sc *tx_sc = &secy->tx_sc;
struct nlattr *txsa_list, *rxsc_list;
int i, j;
void *hdr;
struct nlattr *attr;
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, &macsec_fam);
if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
goto nla_put_failure;
if (nla_put_secy(secy, skb))
goto nla_put_failure;
attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
if (!attr)
goto nla_put_failure;
if (copy_tx_sc_stats(skb, tx_sc->stats)) {
nla_nest_cancel(skb, attr);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
if (!attr)
goto nla_put_failure;
if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
nla_nest_cancel(skb, attr);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
if (!txsa_list)
goto nla_put_failure;
for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
struct nlattr *txsa_nest;
if (!tx_sa)
continue;
txsa_nest = nla_nest_start(skb, j++);
if (!txsa_nest) {
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
nla_nest_cancel(skb, txsa_nest);
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
if (!attr) {
nla_nest_cancel(skb, txsa_nest);
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
if (copy_tx_sa_stats(skb, tx_sa->stats)) {
nla_nest_cancel(skb, attr);
nla_nest_cancel(skb, txsa_nest);
nla_nest_cancel(skb, txsa_list);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
nla_nest_end(skb, txsa_nest);
}
nla_nest_end(skb, txsa_list);
rxsc_list = nla_nest_start(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(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(skb, MACSEC_RXSC_ATTR_STATS);
if (!attr) {
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
if (copy_rx_sc_stats(skb, rx_sc->stats)) {
nla_nest_cancel(skb, attr);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
if (!rxsa_list) {
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
struct nlattr *rxsa_nest;
if (!rx_sa)
continue;
rxsa_nest = nla_nest_start(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(skb, MACSEC_SA_ATTR_STATS);
if (!attr) {
nla_nest_cancel(skb, rxsa_list);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
if (copy_rx_sa_stats(skb, rx_sa->stats)) {
nla_nest_cancel(skb, attr);
nla_nest_cancel(skb, rxsa_list);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
nla_nest_end(skb, attr);
if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
nla_nest_cancel(skb, rxsa_nest);
nla_nest_cancel(skb, rxsc_nest);
nla_nest_cancel(skb, rxsc_list);
goto nla_put_failure;
}
nla_nest_end(skb, rxsa_nest);
}
nla_nest_end(skb, rxsa_list);
nla_nest_end(skb, rxsc_nest);
}
nla_nest_end(skb, rxsc_list);
genlmsg_end(skb, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(skb, hdr);
return -EMSGSIZE;
}
static int macsec_generation = 1; /* protected by RTNL */
static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
struct net_device *dev;
int dev_idx, d;
dev_idx = cb->args[0];
d = 0;
rtnl_lock();
cb->seq = macsec_generation;
for_each_netdev(net, dev) {
struct macsec_secy *secy;
if (d < dev_idx)
goto next;
if (!netif_is_macsec(dev))
goto next;
secy = &macsec_priv(dev)->secy;
if (dump_secy(secy, dev, skb, cb) < 0)
goto done;
next:
d++;
}
done:
rtnl_unlock();
cb->args[0] = d;
return skb->len;
}
static const struct genl_ops macsec_genl_ops[] = {
{
.cmd = MACSEC_CMD_GET_TXSC,
.dumpit = macsec_dump_txsc,
.policy = macsec_genl_policy,
},
{
.cmd = MACSEC_CMD_ADD_RXSC,
.doit = macsec_add_rxsc,
.policy = macsec_genl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_DEL_RXSC,
.doit = macsec_del_rxsc,
.policy = macsec_genl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_UPD_RXSC,
.doit = macsec_upd_rxsc,
.policy = macsec_genl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_ADD_TXSA,
.doit = macsec_add_txsa,
.policy = macsec_genl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_DEL_TXSA,
.doit = macsec_del_txsa,
.policy = macsec_genl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_UPD_TXSA,
.doit = macsec_upd_txsa,
.policy = macsec_genl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_ADD_RXSA,
.doit = macsec_add_rxsa,
.policy = macsec_genl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_DEL_RXSA,
.doit = macsec_del_rxsa,
.policy = macsec_genl_policy,
.flags = GENL_ADMIN_PERM,
},
{
.cmd = MACSEC_CMD_UPD_RXSA,
.doit = macsec_upd_rxsa,
.policy = macsec_genl_policy,
.flags = GENL_ADMIN_PERM,
},
};
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;
/* 10.5 */
if (!secy->protect_frames) {
secy_stats = this_cpu_ptr(macsec->stats);
u64_stats_update_begin(&secy_stats->syncp);
secy_stats->stats.OutPktsUntagged++;
u64_stats_update_end(&secy_stats->syncp);
skb->dev = macsec->real_dev;
len = skb->len;
ret = dev_queue_xmit(skb);
count_tx(dev, ret, len);
return ret;
}
if (!secy->operational) {
kfree_skb(skb);
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
skb = macsec_encrypt(skb, dev);
if (IS_ERR(skb)) {
if (PTR_ERR(skb) != -EINPROGRESS)
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
macsec_encrypt_finish(skb, dev);
len = skb->len;
ret = dev_queue_xmit(skb);
count_tx(dev, ret, len);
return ret;
}
#define MACSEC_FEATURES \
(NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
static struct lock_class_key macsec_netdev_addr_lock_key;
static int macsec_dev_init(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
int err;
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
err = gro_cells_init(&macsec->gro_cells, dev);
if (err) {
free_percpu(dev->tstats);
return err;
}
dev->features = real_dev->features & MACSEC_FEATURES;
dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
dev->needed_headroom = real_dev->needed_headroom +
MACSEC_NEEDED_HEADROOM;
dev->needed_tailroom = real_dev->needed_tailroom +
MACSEC_NEEDED_TAILROOM;
if (is_zero_ether_addr(dev->dev_addr))
eth_hw_addr_inherit(dev, real_dev);
if (is_zero_ether_addr(dev->broadcast))
memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
return 0;
}
static void macsec_dev_uninit(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
gro_cells_destroy(&macsec->gro_cells);
free_percpu(dev->tstats);
}
static netdev_features_t macsec_fix_features(struct net_device *dev,
netdev_features_t features)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
features &= (real_dev->features & MACSEC_FEATURES) |
NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
features |= NETIF_F_LLTX;
return features;
}
static int macsec_dev_open(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
int err;
if (!(real_dev->flags & IFF_UP))
return -ENETDOWN;
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 (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);
dev_mc_unsync(real_dev, dev);
dev_uc_unsync(real_dev, dev);
if (dev->flags & IFF_ALLMULTI)
dev_set_allmulti(real_dev, -1);
if (dev->flags & IFF_PROMISC)
dev_set_promiscuity(real_dev, -1);
dev_uc_del(real_dev, dev->dev_addr);
return 0;
}
static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
{
struct net_device *real_dev = macsec_priv(dev)->real_dev;
if (!(dev->flags & IFF_UP))
return;
if (change & IFF_ALLMULTI)
dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
if (change & IFF_PROMISC)
dev_set_promiscuity(real_dev,
dev->flags & IFF_PROMISC ? 1 : -1);
}
static void macsec_dev_set_rx_mode(struct net_device *dev)
{
struct net_device *real_dev = macsec_priv(dev)->real_dev;
dev_mc_sync(real_dev, dev);
dev_uc_sync(real_dev, dev);
}
static int macsec_set_mac_address(struct net_device *dev, void *p)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
struct sockaddr *addr = p;
int err;
if (!is_valid_ether_addr(addr->sa_data))
return -EADDRNOTAVAIL;
if (!(dev->flags & IFF_UP))
goto out;
err = dev_uc_add(real_dev, addr->sa_data);
if (err < 0)
return err;
dev_uc_del(real_dev, dev->dev_addr);
out:
ether_addr_copy(dev->dev_addr, addr->sa_data);
return 0;
}
static int macsec_change_mtu(struct net_device *dev, int new_mtu)
{
struct macsec_dev *macsec = macsec_priv(dev);
unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
if (macsec->real_dev->mtu - extra < new_mtu)
return -ERANGE;
dev->mtu = new_mtu;
return 0;
}
static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
struct rtnl_link_stats64 *s)
{
int cpu;
if (!dev->tstats)
return s;
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;
return s;
}
static int macsec_get_iflink(const struct net_device *dev)
{
return macsec_priv(dev)->real_dev->ifindex;
}
static int macsec_get_nest_level(struct net_device *dev)
{
return macsec_priv(dev)->nest_level;
}
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,
.ndo_get_lock_subclass = macsec_get_nest_level,
};
static const struct device_type macsec_type = {
.name = "macsec",
};
static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
[IFLA_MACSEC_SCI] = { .type = NLA_U64 },
[IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
[IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
[IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
[IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
[IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
[IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
[IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
[IFLA_MACSEC_ES] = { .type = NLA_U8 },
[IFLA_MACSEC_SCB] = { .type = NLA_U8 },
[IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
[IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
};
static void macsec_free_netdev(struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev = macsec->real_dev;
free_percpu(macsec->stats);
free_percpu(macsec->secy.tx_sc.stats);
dev_put(real_dev);
free_netdev(dev);
}
static void macsec_setup(struct net_device *dev)
{
ether_setup(dev);
dev->priv_flags |= IFF_NO_QUEUE;
dev->netdev_ops = &macsec_netdev_ops;
dev->destructor = macsec_free_netdev;
SET_NETDEV_DEVTYPE(dev, &macsec_type);
eth_zero_addr(dev->broadcast);
}
static void 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]);
}
static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[])
{
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;
macsec_changelink_common(dev, data);
return 0;
}
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);
macsec_common_dellink(dev, head);
if (list_empty(&rxd->secys)) {
netdev_rx_handler_unregister(real_dev);
kfree(rxd);
}
}
static int register_macsec_dev(struct net_device *real_dev,
struct net_device *dev)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
if (!rxd) {
int err;
rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
if (!rxd)
return -ENOMEM;
INIT_LIST_HEAD(&rxd->secys);
err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
rxd);
if (err < 0) {
kfree(rxd);
return err;
}
}
list_add_tail_rcu(&macsec->secys, &rxd->secys);
return 0;
}
static bool sci_exists(struct net_device *dev, sci_t sci)
{
struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
struct macsec_dev *macsec;
list_for_each_entry(macsec, &rxd->secys, secys) {
if (macsec->secy.sci == sci)
return true;
}
return false;
}
static sci_t dev_to_sci(struct net_device *dev, __be16 port)
{
return make_sci(dev->dev_addr, port);
}
static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
{
struct macsec_dev *macsec = macsec_priv(dev);
struct macsec_secy *secy = &macsec->secy;
macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
if (!macsec->stats)
return -ENOMEM;
secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
if (!secy->tx_sc.stats) {
free_percpu(macsec->stats);
return -ENOMEM;
}
if (sci == MACSEC_UNDEF_SCI)
sci = dev_to_sci(dev, MACSEC_PORT_ES);
secy->netdev = dev;
secy->operational = true;
secy->key_len = DEFAULT_SAK_LEN;
secy->icv_len = icv_len;
secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
secy->protect_frames = true;
secy->replay_protect = false;
secy->sci = sci;
secy->tx_sc.active = true;
secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
secy->tx_sc.end_station = false;
secy->tx_sc.scb = false;
return 0;
}
static int macsec_newlink(struct net *net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[])
{
struct macsec_dev *macsec = macsec_priv(dev);
struct net_device *real_dev;
int err;
sci_t sci;
u8 icv_len = DEFAULT_ICV_LEN;
rx_handler_func_t *rx_handler;
if (!tb[IFLA_LINK])
return -EINVAL;
real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
if (!real_dev)
return -ENODEV;
dev->priv_flags |= IFF_MACSEC;
macsec->real_dev = real_dev;
if (data && data[IFLA_MACSEC_ICV_LEN])
icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
rx_handler = rtnl_dereference(real_dev->rx_handler);
if (rx_handler && rx_handler != macsec_handle_frame)
return -EBUSY;
err = register_netdevice(dev);
if (err < 0)
return err;
dev_hold(real_dev);
macsec->nest_level = dev_get_nest_level(real_dev) + 1;
netdev_lockdep_set_classes(dev);
lockdep_set_class_and_subclass(&dev->addr_list_lock,
&macsec_netdev_addr_lock_key,
macsec_get_nest_level(dev));
err = netdev_upper_dev_link(real_dev, dev);
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)
macsec_changelink_common(dev, data);
err = register_macsec_dev(real_dev, dev);
if (err < 0)
goto del_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[])
{
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_DEFAULT_CIPHER_ID:
case MACSEC_DEFAULT_CIPHER_ALT:
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 0 +
nla_total_size_64bit(8) + /* SCI */
nla_total_size(1) + /* ICV_LEN */
nla_total_size_64bit(8) + /* CIPHER_SUITE */
nla_total_size(4) + /* WINDOW */
nla_total_size(1) + /* ENCODING_SA */
nla_total_size(1) + /* ENCRYPT */
nla_total_size(1) + /* PROTECT */
nla_total_size(1) + /* INC_SCI */
nla_total_size(1) + /* ES */
nla_total_size(1) + /* SCB */
nla_total_size(1) + /* REPLAY_PROTECT */
nla_total_size(1) + /* 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;
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,
MACSEC_DEFAULT_CIPHER_ID, 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_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_with_ops(&macsec_fam, macsec_genl_ops);
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_DESCRIPTION("MACsec IEEE 802.1AE");
MODULE_LICENSE("GPL v2");
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