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Message-Id: <d7145f6037142ea5134be0402e014a9c72f7b8d4.1456937772.git.sd@queasysnail.net>
Date: Mon, 7 Mar 2016 18:12:40 +0100
From: Sabrina Dubroca <sd@...asysnail.net>
To: netdev@...r.kernel.org
Cc: Hannes Frederic Sowa <hannes@...essinduktion.org>,
Florian Westphal <fw@...len.de>,
Paolo Abeni <pabeni@...hat.com>, stephen@...workplumber.org,
Sabrina Dubroca <sd@...asysnail.net>
Subject: [PATCH net-next 3/3] macsec: introduce IEEE 802.1AE driver
This is an implementation of MACsec/IEEE 802.1AE. This driver
provides authentication and encryption of traffic in a LAN, typically
with GCM-AES-128, and optional replay protection.
http://standards.ieee.org/getieee802/download/802.1AE-2006.pdf
Signed-off-by: Sabrina Dubroca <sd@...asysnail.net>
Reviewed-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
v1:
- fix ENCODING_SA param validation
- add parent link to netlink ifdumps
RFCv2:
- rcu fixes pointed out by Florian
- get rid of magic numbers in shortlength field validation, use a nice
helper function instead
- extract post-decrypt handling from macsec_handle_frame to reuse it in
the decrypt callback
- needed headroom shouldn't include hard_header len, pointed out by Paolo
- added refcounting on macsec_rx_sc
- fixed ->dellink behavior
---
drivers/net/Kconfig | 7 +
drivers/net/Makefile | 1 +
drivers/net/macsec.c | 3037 ++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 3045 insertions(+)
create mode 100644 drivers/net/macsec.c
diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index f184fb5bd110..2a1ba62b7da2 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -193,6 +193,13 @@ config GENEVE
To compile this driver as a module, choose M here: the module
will be called geneve.
+config MACSEC
+ tristate "IEEE 802.1AE MAC-level encryption (MACsec)"
+ select CRYPTO_AES
+ select CRYPTO_GCM
+ ---help---
+ MACsec is an encryption standard for Ethernet.
+
config NETCONSOLE
tristate "Network console logging support"
---help---
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 900b0c5320bb..1aa7cb845663 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_IPVLAN) += ipvlan/
obj-$(CONFIG_DUMMY) += dummy.o
obj-$(CONFIG_EQUALIZER) += eql.o
obj-$(CONFIG_IFB) += ifb.o
+obj-$(CONFIG_MACSEC) += macsec.o
obj-$(CONFIG_MACVLAN) += macvlan.o
obj-$(CONFIG_MACVTAP) += macvtap.o
obj-$(CONFIG_MII) += mii.o
diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
new file mode 100644
index 000000000000..af79f59d4dd7
--- /dev/null
+++ b/drivers/net/macsec.c
@@ -0,0 +1,3037 @@
+/*
+ * drivers/net/macsec.c - MACsec device
+ *
+ * Copyright (c) 2015 Sabrina Dubroca <sd@...asysnail.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 <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)
+
+#define MACSEC_SHORTLEN_THR 48
+
+#define GCM_AES_IV_LEN 12
+#define DEFAULT_ICV_LEN 16
+
+#define for_each_rxsc(secy, sc) \
+ for (sc = rcu_dereference_bh(secy->rx_sc); \
+ sc; \
+ sc = rcu_dereference_bh(sc->next))
+#define for_each_rxsc_rtnl(secy, sc) \
+ for (sc = rtnl_dereference(secy->rx_sc); \
+ sc; \
+ sc = rtnl_dereference(sc->next))
+
+struct gcm_iv {
+ union {
+ u8 secure_channel_id[8];
+ sci_t sci;
+ };
+ __be32 pn;
+};
+
+/**
+ * struct macsec_key - SA key
+ * @id user-provided key identifier
+ * @tfm crypto struct, key storage
+ */
+struct macsec_key {
+ u64 id;
+ struct crypto_aead *tfm;
+};
+
+/**
+ * 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 {
+ bool active;
+ u32 next_pn;
+ spinlock_t lock;
+ struct macsec_key key;
+ struct macsec_rx_sa_stats __percpu *stats;
+ struct macsec_rx_sc *sc;
+ atomic_t refcnt;
+ 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[4];
+ 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 {
+ bool active;
+ u32 next_pn;
+ spinlock_t lock;
+ struct macsec_key key;
+ struct macsec_tx_sa_stats __percpu *stats;
+ atomic_t refcnt;
+ 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[4];
+ 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 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 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);
+ macsec_rxsc_put(sa->sc);
+ 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 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)
+{
+ const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
+
+ memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci));
+ h->eth.h_proto = htons(ETH_P_MACSEC);
+
+ if (tx_sc->send_sci ||
+ (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) {
+ 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 < MACSEC_SHORTLEN_THR)
+ h->short_length = data_len;
+}
+
+/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
+#define MIN_NON_SHORT_LEN 48
+
+/* 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_MAX_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, transitionning 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 sk_buff *macsec_encrypt(struct sk_buff *skb,
+ struct net_device *dev)
+{
+ int ret;
+ struct scatterlist sg[MAX_SKB_FRAGS + 1];
+ unsigned char iv[GCM_AES_IV_LEN];
+ 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);
+ 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);
+ hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci));
+ 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);
+ macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
+
+ macsec_fill_iv(iv, secy->sci, pn);
+
+ 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 = aead_request_alloc(tx_sa->key.tfm, GFP_ATOMIC);
+ if (!req) {
+ macsec_txsa_put(tx_sa);
+ kfree_skb(skb);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ 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(tx_sc->send_sci) -
+ secy->icv_len;
+ aead_request_set_crypt(req, sg, sg, len, iv);
+ aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci));
+ } 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;
+ 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 = netif_rx(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);
+ dev_put(dev);
+ return;
+}
+
+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[MAX_SKB_FRAGS + 1];
+ unsigned char iv[GCM_AES_IV_LEN];
+ struct aead_request *req;
+ struct macsec_eth_header *hdr;
+ u16 icv_len = secy->icv_len;
+
+ macsec_skb_cb(skb)->valid = 0;
+ skb = skb_share_check(skb, GFP_ATOMIC);
+ if (!skb)
+ return NULL;
+
+ req = aead_request_alloc(rx_sa->key.tfm, GFP_ATOMIC);
+ if (!req) {
+ kfree_skb(skb);
+ return NULL;
+ }
+
+ 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 NULL;
+ }
+ } 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;
+ macsec_skb_cb(skb)->rx_sa = rx_sa;
+ 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 NULL;
+ } else if (ret != 0) {
+ /* decryption/authentication failed
+ * 10.6 if validateFrames is disabled, deliver anyway
+ */
+ if (ret != -EBADMSG) {
+ kfree_skb(skb);
+ skb = NULL;
+ }
+ } else {
+ macsec_skb_cb(skb)->valid = 1;
+ }
+ 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_bh();
+ 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_bh();
+}
+
+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;
+
+ 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_bh();
+ 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);
+
+ 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;
+ }
+ }
+
+ /* 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 (!skb) {
+ macsec_rxsa_put(rx_sa);
+ rcu_read_unlock_bh();
+ *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);
+
+ macsec_rxsa_put(rx_sa);
+ count_rx(dev, skb->len);
+
+ rcu_read_unlock_bh();
+
+ *pskb = skb;
+ return RX_HANDLER_ANOTHER;
+
+drop:
+ macsec_rxsa_put(rx_sa);
+drop_nosa:
+ rcu_read_unlock_bh();
+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;
+ int ret;
+
+ 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_bh();
+ *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, CRYPTO_ALG_ASYNC);
+ if (!tfm || IS_ERR(tfm))
+ return NULL;
+
+ ret = crypto_aead_setkey(tfm, key, key_len);
+ if (ret < 0) {
+ crypto_free_aead(tfm);
+ return NULL;
+ }
+
+ ret = crypto_aead_setauthsize(tfm, icv_len);
+ if (ret < 0) {
+ crypto_free_aead(tfm);
+ return NULL;
+ }
+
+ return tfm;
+}
+
+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 -1;
+
+ rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
+ if (!rx_sa->key.tfm) {
+ free_percpu(rx_sa->stats);
+ return -1;
+ }
+
+ 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 < 4; 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 -1;
+
+ tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
+ if (!tx_sa->key.tfm) {
+ free_percpu(tx_sa->stats);
+ return -1;
+ }
+
+ 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)
+{
+ return nla_put_u64(skb, attrtype, (__force u64)value);
+}
+
+static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
+ struct nlattr **attrs,
+ 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 (!attrs[MACSEC_ATTR_SA_AN])
+ return ERR_PTR(-EINVAL);
+
+ *assoc_num = nla_get_u8(attrs[MACSEC_ATTR_SA_AN]);
+
+ dev = get_dev_from_nl(net, attrs);
+ if (IS_ERR(dev))
+ return ERR_CAST(dev);
+
+ if (*assoc_num > 3)
+ 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 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 (!attrs[MACSEC_ATTR_SCI])
+ return ERR_PTR(-EINVAL);
+
+ sci = nla_get_sci(attrs[MACSEC_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 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 (!attrs[MACSEC_ATTR_SA_AN])
+ return ERR_PTR(-EINVAL);
+
+ *assoc_num = nla_get_u8(attrs[MACSEC_ATTR_SA_AN]);
+ if (*assoc_num > 3)
+ return ERR_PTR(-EINVAL);
+
+ rx_sc = get_rxsc_from_nl(net, attrs, 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 bool validate_add_rxsa(struct nlattr **attrs)
+{
+ if (!attrs[MACSEC_ATTR_IFINDEX] ||
+ !attrs[MACSEC_ATTR_SCI] ||
+ !attrs[MACSEC_ATTR_SA_AN] ||
+ !attrs[MACSEC_ATTR_SA_KEY] ||
+ !attrs[MACSEC_ATTR_SA_KEYID])
+ return false;
+
+ if (nla_get_u8(attrs[MACSEC_ATTR_SA_AN]) > 3)
+ return false;
+
+ if (attrs[MACSEC_ATTR_SA_PN] && nla_get_u32(attrs[MACSEC_ATTR_SA_PN]) == 0)
+ return false;
+
+ if (attrs[MACSEC_ATTR_SA_ACTIVE]) {
+ if (nla_get_u8(attrs[MACSEC_ATTR_SA_ACTIVE]) > 1)
+ 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;
+
+ if (!validate_add_rxsa(attrs))
+ return -EINVAL;
+
+ rtnl_lock();
+ rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, &dev, &secy);
+ if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) {
+ rtnl_unlock();
+ return PTR_ERR(rx_sc);
+ }
+
+ assoc_num = nla_get_u8(attrs[MACSEC_ATTR_SA_AN]);
+
+ if (nla_len(attrs[MACSEC_ATTR_SA_KEY]) != secy->key_len) {
+ pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
+ nla_len(attrs[MACSEC_ATTR_SA_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 (init_rx_sa(rx_sa, nla_data(attrs[MACSEC_ATTR_SA_KEY]), secy->key_len,
+ secy->icv_len)) {
+ rtnl_unlock();
+ return -ENOMEM;
+ }
+
+ if (attrs[MACSEC_ATTR_SA_PN]) {
+ spin_lock_bh(&rx_sa->lock);
+ rx_sa->next_pn = nla_get_u32(attrs[MACSEC_ATTR_SA_PN]);
+ spin_unlock_bh(&rx_sa->lock);
+ }
+
+ if (attrs[MACSEC_ATTR_SA_ACTIVE])
+ rx_sa->active = !!nla_get_u8(attrs[MACSEC_ATTR_SA_ACTIVE]);
+
+ rx_sa->key.id = nla_get_u64(attrs[MACSEC_ATTR_SA_KEYID]);
+ 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_ATTR_SC_IFINDEX] ||
+ !attrs[MACSEC_ATTR_SC_SCI])
+ return false;
+
+ if (attrs[MACSEC_ATTR_SC_ACTIVE]) {
+ if (nla_get_u8(attrs[MACSEC_ATTR_SC_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;
+
+ if (!validate_add_rxsc(attrs))
+ 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(attrs[MACSEC_ATTR_SC_SCI]);
+
+ rx_sc = create_rx_sc(dev, sci);
+ if (IS_ERR(rx_sc)) {
+ rtnl_unlock();
+ return PTR_ERR(rx_sc);
+ }
+
+ if (attrs[MACSEC_ATTR_SC_ACTIVE])
+ rx_sc->active = !!nla_get_u8(attrs[MACSEC_ATTR_SC_ACTIVE]);
+
+ rtnl_unlock();
+
+ return 0;
+}
+
+static bool validate_add_txsa(struct nlattr **attrs)
+{
+ if (!attrs[MACSEC_ATTR_IFINDEX] ||
+ !attrs[MACSEC_ATTR_SA_AN] ||
+ !attrs[MACSEC_ATTR_SA_PN] ||
+ !attrs[MACSEC_ATTR_SA_KEY] ||
+ !attrs[MACSEC_ATTR_SA_KEYID])
+ return false;
+
+ if (nla_get_u8(attrs[MACSEC_ATTR_SA_AN]) > 3)
+ return false;
+
+ if (nla_get_u32(attrs[MACSEC_ATTR_SA_PN]) == 0)
+ return false;
+
+ if (attrs[MACSEC_ATTR_SA_ACTIVE]) {
+ if (nla_get_u8(attrs[MACSEC_ATTR_SA_ACTIVE]) > 1)
+ 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;
+
+ if (!validate_add_txsa(attrs))
+ 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(attrs[MACSEC_ATTR_SA_AN]);
+
+ if (nla_len(attrs[MACSEC_ATTR_SA_KEY]) != secy->key_len) {
+ pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
+ nla_len(attrs[MACSEC_ATTR_SA_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 || init_tx_sa(tx_sa, nla_data(attrs[MACSEC_ATTR_SA_KEY]),
+ secy->key_len, secy->icv_len)) {
+ rtnl_unlock();
+ return -ENOMEM;
+ }
+
+ tx_sa->key.id = nla_get_u64(attrs[MACSEC_ATTR_SA_KEYID]);
+
+ spin_lock_bh(&tx_sa->lock);
+ tx_sa->next_pn = nla_get_u32(attrs[MACSEC_ATTR_SA_PN]);
+ spin_unlock_bh(&tx_sa->lock);
+
+ if (attrs[MACSEC_ATTR_SA_ACTIVE])
+ tx_sa->active = !!nla_get_u8(attrs[MACSEC_ATTR_SA_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 net_device *dev;
+ struct macsec_secy *secy;
+ struct macsec_rx_sc *rx_sc;
+ struct macsec_rx_sa *rx_sa;
+ u8 assoc_num;
+
+ rtnl_lock();
+ rx_sa = get_rxsa_from_nl(genl_info_net(info), info->attrs, &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 bool validate_del_rxsc(struct nlattr **attrs)
+{
+ return attrs[MACSEC_ATTR_SC_IFINDEX] && attrs[MACSEC_ATTR_SC_SCI];
+}
+
+static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net_device *dev;
+ struct macsec_secy *secy;
+ struct macsec_rx_sc *rx_sc;
+ sci_t sci;
+
+ if (!validate_del_rxsc(info->attrs))
+ 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(info->attrs[MACSEC_ATTR_SC_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 net_device *dev;
+ struct macsec_secy *secy;
+ struct macsec_tx_sc *tx_sc;
+ struct macsec_tx_sa *tx_sa;
+ u8 assoc_num;
+
+ rtnl_lock();
+ tx_sa = get_txsa_from_nl(genl_info_net(info), info->attrs, &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 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;
+
+ rtnl_lock();
+ tx_sa = get_txsa_from_nl(genl_info_net(info), info->attrs, &dev, &secy,
+ &tx_sc, &assoc_num);
+ if (IS_ERR(tx_sa)) {
+ rtnl_unlock();
+ return PTR_ERR(tx_sa);
+ }
+
+ if (attrs[MACSEC_ATTR_SA_PN]) {
+ spin_lock_bh(&tx_sa->lock);
+ tx_sa->next_pn = nla_get_u32(attrs[MACSEC_ATTR_SA_PN]);
+ spin_unlock_bh(&tx_sa->lock);
+ }
+
+ if (attrs[MACSEC_ATTR_SA_ACTIVE])
+ tx_sa->active = nla_get_u8(attrs[MACSEC_ATTR_SA_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;
+
+ rtnl_lock();
+ rx_sa = get_rxsa_from_nl(genl_info_net(info), info->attrs, &dev, &secy,
+ &rx_sc, &assoc_num);
+ if (IS_ERR(rx_sa)) {
+ rtnl_unlock();
+ return PTR_ERR(rx_sa);
+ }
+
+ if (attrs[MACSEC_ATTR_SA_PN]) {
+ spin_lock_bh(&rx_sa->lock);
+ rx_sa->next_pn = nla_get_u32(attrs[MACSEC_ATTR_SA_PN]);
+ spin_unlock_bh(&rx_sa->lock);
+ }
+
+ if (attrs[MACSEC_ATTR_SA_ACTIVE])
+ rx_sa->active = nla_get_u8(attrs[MACSEC_ATTR_SA_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;
+
+ if (!validate_del_rxsc(info->attrs))
+ return -EINVAL;
+
+ rtnl_lock();
+ rx_sc = get_rxsc_from_nl(genl_info_net(info), info->attrs, &dev, &secy);
+ if (IS_ERR(rx_sc)) {
+ rtnl_unlock();
+ return PTR_ERR(rx_sc);
+ }
+
+ if (attrs[MACSEC_ATTR_SC_ACTIVE]) {
+ bool new = !!nla_get_u8(attrs[MACSEC_ATTR_SC_ACTIVE]);
+
+ if (rx_sc->active != new)
+ secy->n_rx_sc += new ? 1 : -1;
+
+ rx_sc->active = new;
+ }
+
+ rtnl_unlock();
+
+ return 0;
+}
+
+static void copy_tx_sa_stats(struct macsec_tx_sa_stats *sum,
+ struct macsec_tx_sa_stats __percpu *pstats)
+{
+ int cpu;
+
+ memset(sum, 0, sizeof(*sum));
+ 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;
+ }
+}
+
+static void copy_rx_sa_stats(struct macsec_rx_sa_stats *sum,
+ struct macsec_rx_sa_stats __percpu *pstats)
+{
+ int cpu;
+
+ memset(sum, 0, sizeof(*sum));
+ 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;
+ }
+}
+
+static void copy_rx_sc_stats(struct macsec_rx_sc_stats *sum,
+ struct pcpu_rx_sc_stats __percpu *pstats)
+{
+ int cpu;
+
+ memset(sum, 0, sizeof(*sum));
+ 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;
+ }
+}
+
+static void copy_tx_sc_stats(struct macsec_tx_sc_stats *sum,
+ struct pcpu_tx_sc_stats __percpu *pstats)
+{
+ int cpu;
+
+ memset(sum, 0, sizeof(*sum));
+ 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;
+ }
+}
+
+static void copy_secy_stats(struct macsec_dev_stats *sum,
+ struct pcpu_secy_stats __percpu *pstats)
+{
+ int cpu;
+
+ memset(sum, 0, sizeof(*sum));
+ 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;
+ }
+}
+
+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;
+ 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;
+
+ rtnl_lock();
+
+ if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex) ||
+ nla_put_sci(skb, MACSEC_ATTR_SCI, secy->sci) ||
+ nla_put_u64(skb, MACSEC_ATTR_CIPHER_SUITE, DEFAULT_CIPHER_ID) ||
+ nla_put_u8(skb, MACSEC_ATTR_ICV_LEN, secy->icv_len) ||
+ nla_put_u8(skb, MACSEC_ATTR_OPER, secy->operational) ||
+ nla_put_u8(skb, MACSEC_ATTR_PROTECT, secy->protect_frames) ||
+ nla_put_u8(skb, MACSEC_ATTR_REPLAY, secy->replay_protect) ||
+ nla_put_u8(skb, MACSEC_ATTR_VALIDATE, secy->validate_frames) ||
+ nla_put_u8(skb, MACSEC_ATTR_ENCRYPT, tx_sc->encrypt) ||
+ nla_put_u8(skb, MACSEC_ATTR_INC_SCI, tx_sc->send_sci) ||
+ nla_put_u8(skb, MACSEC_ATTR_ES, tx_sc->end_station) ||
+ nla_put_u8(skb, MACSEC_ATTR_SCB, tx_sc->scb) ||
+ nla_put_u8(skb, MACSEC_ATTR_ENCODING_SA, tx_sc->encoding_sa))
+ goto nla_put_failure;
+
+ attr = nla_reserve(skb, MACSEC_TXSC_STATS,
+ sizeof(struct macsec_tx_sc_stats));
+ if (!attr)
+ goto nla_put_failure;
+ copy_tx_sc_stats(nla_data(attr), tx_sc->stats);
+
+ attr = nla_reserve(skb, MACSEC_SECY_STATS,
+ sizeof(struct macsec_dev_stats));
+ if (!attr)
+ goto nla_put_failure;
+ copy_secy_stats(nla_data(attr), macsec_priv(dev)->stats);
+
+ if (secy->replay_protect) {
+ if (nla_put_u32(skb, MACSEC_ATTR_WINDOW, secy->replay_window))
+ goto nla_put_failure;
+ }
+
+ txsa_list = nla_nest_start(skb, MACSEC_TXSA_LIST);
+ if (!txsa_list)
+ goto nla_put_failure;
+ for (i = 0; i < 4; 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, MACSEC_SA);
+ if (!txsa_nest) {
+ nla_nest_cancel(skb, txsa_list);
+ goto nla_put_failure;
+ }
+
+ if (nla_put_u8(skb, MACSEC_ATTR_SA_AN, i) ||
+ nla_put_u32(skb, MACSEC_ATTR_SA_PN, tx_sa->next_pn) ||
+ nla_put_u64(skb, MACSEC_ATTR_SA_KEYID, tx_sa->key.id) ||
+ nla_put_u8(skb, MACSEC_ATTR_SA_ACTIVE, tx_sa->active)) {
+ nla_nest_cancel(skb, txsa_nest);
+ nla_nest_cancel(skb, txsa_list);
+ goto nla_put_failure;
+ }
+
+ attr = nla_reserve(skb, MACSEC_SA_STATS,
+ sizeof(struct macsec_tx_sa_stats));
+ if (!attr)
+ goto nla_put_failure;
+ copy_tx_sa_stats(nla_data(attr), tx_sa->stats);
+
+ nla_nest_end(skb, txsa_nest);
+ }
+ nla_nest_end(skb, txsa_list);
+
+ rxsc_list = nla_nest_start(skb, MACSEC_RXSC_LIST);
+ if (!rxsc_list)
+ goto nla_put_failure;
+
+ for_each_rxsc_rtnl(secy, rx_sc) {
+ struct nlattr *rxsa_list;
+ struct nlattr *rxsc_nest = nla_nest_start(skb, MACSEC_RXSC);
+
+ if (!rxsc_nest) {
+ nla_nest_cancel(skb, rxsc_list);
+ goto nla_put_failure;
+ }
+
+ if (nla_put_u8(skb, MACSEC_ATTR_SC_ACTIVE, rx_sc->active) ||
+ nla_put_sci(skb, MACSEC_ATTR_SC_SCI, rx_sc->sci)) {
+ nla_nest_cancel(skb, rxsc_nest);
+ nla_nest_cancel(skb, rxsc_list);
+ goto nla_put_failure;
+ }
+
+ attr = nla_reserve(skb, MACSEC_RXSC_STATS,
+ sizeof(struct macsec_rx_sc_stats));
+ if (!attr)
+ goto nla_put_failure;
+ copy_rx_sc_stats(nla_data(attr), rx_sc->stats);
+
+ rxsa_list = nla_nest_start(skb, MACSEC_RXSA_LIST);
+ if (!rxsa_list) {
+ nla_nest_cancel(skb, rxsc_nest);
+ nla_nest_cancel(skb, rxsc_list);
+ goto nla_put_failure;
+ }
+
+ for (i = 0; i < 4; 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, MACSEC_SA);
+ 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_reserve(skb, MACSEC_SA_STATS,
+ sizeof(struct macsec_rx_sa_stats));
+ if (!attr)
+ goto nla_put_failure;
+ copy_rx_sa_stats(nla_data(attr), rx_sa->stats);
+
+ if (nla_put_u8(skb, MACSEC_ATTR_SA_AN, i) ||
+ nla_put_u32(skb, MACSEC_ATTR_SA_PN, rx_sa->next_pn) ||
+ nla_put_u64(skb, MACSEC_ATTR_SA_KEYID, rx_sa->key.id) ||
+ nla_put_u8(skb, MACSEC_ATTR_SA_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);
+
+ rtnl_unlock();
+
+ genlmsg_end(skb, hdr);
+
+ return 0;
+
+nla_put_failure:
+ rtnl_unlock();
+ genlmsg_cancel(skb, hdr);
+ return -EMSGSIZE;
+}
+
+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;
+ 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:
+ cb->args[0] = d;
+ return skb->len;
+}
+
+static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
+ [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
+ [MACSEC_ATTR_SCI] = { .type = NLA_U64 },
+ [MACSEC_ATTR_WINDOW] = { .type = NLA_U32 },
+ [MACSEC_ATTR_CIPHER_SUITE] = { .type = NLA_U64 },
+ [MACSEC_ATTR_ICV_LEN] = { .type = NLA_U8 },
+ [MACSEC_ATTR_PROTECT] = { .type = NLA_U8 },
+ [MACSEC_ATTR_REPLAY] = { .type = NLA_U8 },
+ [MACSEC_ATTR_OPER] = { .type = NLA_U8 },
+ [MACSEC_ATTR_VALIDATE] = { .type = NLA_U8 },
+ [MACSEC_ATTR_ENCRYPT] = { .type = NLA_U8 },
+ [MACSEC_ATTR_INC_SCI] = { .type = NLA_U8 },
+ [MACSEC_ATTR_ES] = { .type = NLA_U8 },
+ [MACSEC_ATTR_SCB] = { .type = NLA_U8 },
+};
+
+static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_SC_ATTR] = {
+ [MACSEC_ATTR_SC_IFINDEX] = { .type = NLA_U32 },
+ [MACSEC_ATTR_SC_SCI] = { .type = NLA_U64 },
+ [MACSEC_ATTR_SC_ACTIVE] = { .type = NLA_U8 },
+};
+
+static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
+ [MACSEC_ATTR_SA_IFINDEX] = { .type = NLA_U32 },
+ [MACSEC_ATTR_SA_SCI] = { .type = NLA_U64 },
+ [MACSEC_ATTR_SA_AN] = { .type = NLA_U8 },
+ [MACSEC_ATTR_SA_ACTIVE] = { .type = NLA_U8 },
+ [MACSEC_ATTR_SA_PN] = { .type = NLA_U32 },
+ [MACSEC_ATTR_SA_KEYID] = { .type = NLA_U64 },
+ [MACSEC_ATTR_SA_KEY] = { .type = NLA_BINARY,
+ .len = MACSEC_MAX_KEY_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_rxsc_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = MACSEC_CMD_DEL_RXSC,
+ .doit = macsec_del_rxsc,
+ .policy = macsec_genl_rxsc_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = MACSEC_CMD_UPD_RXSC,
+ .doit = macsec_upd_rxsc,
+ .policy = macsec_genl_rxsc_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = MACSEC_CMD_ADD_TXSA,
+ .doit = macsec_add_txsa,
+ .policy = macsec_genl_sa_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = MACSEC_CMD_DEL_TXSA,
+ .doit = macsec_del_txsa,
+ .policy = macsec_genl_sa_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = MACSEC_CMD_UPD_TXSA,
+ .doit = macsec_upd_txsa,
+ .policy = macsec_genl_sa_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = MACSEC_CMD_ADD_RXSA,
+ .doit = macsec_add_rxsa,
+ .policy = macsec_genl_sa_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = MACSEC_CMD_DEL_RXSA,
+ .doit = macsec_del_rxsa,
+ .policy = macsec_genl_sa_policy,
+ .flags = GENL_ADMIN_PERM,
+ },
+ {
+ .cmd = MACSEC_CMD_UPD_RXSA,
+ .doit = macsec_upd_rxsa,
+ .policy = macsec_genl_sa_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);
+ len = skb->len;
+ ret = dev_queue_xmit(skb);
+ count_tx(dev, ret, len);
+ return ret;
+ }
+
+ if (!secy->operational) {
+ kfree_skb(skb);
+ dev->stats.tx_dropped++;
+ return NETDEV_TX_OK;
+ }
+
+ skb = macsec_encrypt(skb, dev);
+ if (IS_ERR(skb)) {
+ if (PTR_ERR(skb) != -EINPROGRESS)
+ dev->stats.tx_dropped++;
+ return NETDEV_TX_OK;
+ }
+
+ macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
+
+ macsec_encrypt_finish(skb, dev);
+ len = skb->len;
+ ret = dev_queue_xmit(skb);
+ count_tx(dev, ret, len);
+ return ret;
+}
+
+#define MACSEC_FEATURES \
+ (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
+static int macsec_dev_init(struct net_device *dev)
+{
+ struct macsec_dev *macsec = macsec_priv(dev);
+ struct net_device *real_dev = macsec->real_dev;
+
+ dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
+ if (!dev->tstats)
+ return -ENOMEM;
+
+ 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)
+{
+ 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;
+ features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
+
+ 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 const struct net_device_ops macsec_netdev_ops = {
+ .ndo_init = macsec_dev_init,
+ .ndo_uninit = macsec_dev_uninit,
+ .ndo_open = macsec_dev_open,
+ .ndo_stop = macsec_dev_stop,
+ .ndo_fix_features = macsec_fix_features,
+ .ndo_change_mtu = macsec_change_mtu,
+ .ndo_set_rx_mode = macsec_dev_set_rx_mode,
+ .ndo_change_rx_flags = macsec_dev_change_rx_flags,
+ .ndo_set_mac_address = macsec_set_mac_address,
+ .ndo_start_xmit = macsec_start_xmit,
+ .ndo_get_stats64 = macsec_get_stats64,
+ .ndo_get_iflink = macsec_get_iflink,
+};
+
+static const struct device_type macsec_type = {
+ .name = "macsec",
+};
+
+static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
+ [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
+ [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
+ [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
+ [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
+ [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
+ [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
+ [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
+ [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
+ [IFLA_MACSEC_ES] = { .type = NLA_U8 },
+ [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
+ [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
+ [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
+};
+
+static void macsec_free_netdev(struct net_device *dev)
+{
+ struct macsec_dev *macsec = macsec_priv(dev);
+ 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->tx_queue_len = 0;
+ dev->netdev_ops = &macsec_netdev_ops;
+ dev->destructor = macsec_free_netdev;
+
+ 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 < 4; 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_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);
+
+ unregister_netdevice_queue(dev, head);
+ list_del_rcu(&macsec->secys);
+ if (list_empty(&rxd->secys))
+ netdev_rx_handler_unregister(real_dev);
+
+ macsec_del_dev(macsec);
+}
+
+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)
+ 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;
+
+ /* 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 unregister;
+ }
+
+ err = macsec_add_dev(dev, sci, icv_len);
+ if (err)
+ goto unregister;
+
+ if (data)
+ macsec_changelink_common(dev, data);
+
+ err = register_macsec_dev(real_dev, dev);
+ if (err < 0)
+ goto del_dev;
+
+ dev_hold(real_dev);
+
+ return 0;
+
+del_dev:
+ macsec_del_dev(macsec);
+unregister:
+ unregister_netdevice(dev);
+ return err;
+}
+
+static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
+{
+ u64 csid = 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]);
+
+ switch (csid) {
+ case DEFAULT_CIPHER_ID:
+ case DEFAULT_CIPHER_ALT:
+ if (icv_len < MACSEC_MIN_ICV_LEN ||
+ icv_len > MACSEC_MAX_ICV_LEN)
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (data[IFLA_MACSEC_ENCODING_SA]) {
+ if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) > 3)
+ 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_PROTECT] &&
+ nla_get_u8(data[IFLA_MACSEC_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(8) + /* SCI */
+ nla_total_size(1) + /* ICV_LEN */
+ nla_total_size(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) ||
+ nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
+ nla_put_u64(skb, IFLA_MACSEC_CIPHER_SUITE, DEFAULT_CIPHER_ID) ||
+ 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_dellink(m->secy.netdev, &head);
+ }
+ 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);
+}
+
+module_init(macsec_init);
+module_exit(macsec_exit);
+
+MODULE_ALIAS_RTNL_LINK("macsec");
+
+MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
+MODULE_LICENSE("GPL v2");
--
2.7.2
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