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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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SPDX-License-Identifier: GPL-2.0-or-later/* * drivers/net/macsec.c - MACsec device * * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net> */
#include <linux/types.h>#include <linux/skbuff.h>#include <linux/socket.h>#include <linux/module.h>#include <crypto/aead.h>#include <linux/etherdevice.h>#include <linux/netdevice.h>#include <linux/rtnetlink.h>#include <linux/refcount.h>#include <net/genetlink.h>#include <net/sock.h>#include <net/gro_cells.h>#include <net/macsec.h>#include <net/dst_metadata.h>#include <net/rtnetlink.h>#include <net/netdev_lock.h>#include <linux/phy.h>#include <linux/byteorder/generic.h>#include <linux/if_arp.h>
#include <uapi/linux/if_macsec.h>
static struct workqueue_struct *macsec_wq;
/* SecTAG length = macsec_eth_header without the optional SCI */#define MACSEC_TAG_LEN 6
struct macsec_eth_header { struct ethhdr eth; /* SecTAG */ u8 tci_an;#if defined(__LITTLE_ENDIAN_BITFIELD) u8 short_length:6, unused:2;#elif defined(__BIG_ENDIAN_BITFIELD) u8 unused:2, short_length:6;#else#error "Please fix <asm/byteorder.h>"#endif __be32 packet_number; u8 secure_channel_id[8]; /* optional */} __packed;
/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */#define MIN_NON_SHORT_LEN 48
#define GCM_AES_IV_LEN 12
#define for_each_rxsc(secy, sc) \ for (sc = rcu_dereference_bh(secy->rx_sc); \ sc; \ sc = rcu_dereference_bh(sc->next))#define for_each_rxsc_rtnl(secy, sc) \ for (sc = rtnl_dereference(secy->rx_sc); \ sc; \ sc = rtnl_dereference(sc->next))
#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
struct gcm_iv_xpn { union { u8 short_secure_channel_id[4]; ssci_t ssci; }; __be64 pn;} __packed;
struct gcm_iv { union { u8 secure_channel_id[8]; sci_t sci; }; __be32 pn;};
#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
struct pcpu_secy_stats { struct macsec_dev_stats stats; struct u64_stats_sync syncp;};
/** * struct macsec_dev - private data * @secy: SecY config * @real_dev: pointer to underlying netdevice * @dev_tracker: refcount tracker for @real_dev reference * @stats: MACsec device stats * @secys: linked list of SecY's on the underlying device * @gro_cells: pointer to the Generic Receive Offload cell * @offload: status of offloading on the MACsec device * @insert_tx_tag: when offloading, device requires to insert an * additional tag */struct macsec_dev { struct macsec_secy secy; struct net_device *real_dev; netdevice_tracker dev_tracker; struct pcpu_secy_stats __percpu *stats; struct list_head secys; struct gro_cells gro_cells; enum macsec_offload offload; bool insert_tx_tag;};
/** * struct macsec_rxh_data - rx_handler private argument * @secys: linked list of SecY's on this underlying device */struct macsec_rxh_data { struct list_head secys;};
static struct macsec_dev *macsec_priv(const struct net_device *dev){ return (struct macsec_dev *)netdev_priv(dev);}
static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev){ return rcu_dereference_bh(dev->rx_handler_data);}
static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev){ return rtnl_dereference(dev->rx_handler_data);}
struct macsec_cb { struct aead_request *req; union { struct macsec_tx_sa *tx_sa; struct macsec_rx_sa *rx_sa; }; u8 assoc_num; bool valid; bool has_sci;};
static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr){ struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
if (!sa || !sa->active) return NULL;
if (!refcount_inc_not_zero(&sa->refcnt)) return NULL;
return sa;}
static void free_rx_sc_rcu(struct rcu_head *head){ struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
free_percpu(rx_sc->stats); kfree(rx_sc);}
static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc){ return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;}
static void macsec_rxsc_put(struct macsec_rx_sc *sc){ if (refcount_dec_and_test(&sc->refcnt)) call_rcu(&sc->rcu_head, free_rx_sc_rcu);}
static void free_rxsa_work(struct work_struct *work){ struct macsec_rx_sa *sa = container_of(to_rcu_work(work), struct macsec_rx_sa, destroy_work);
crypto_free_aead(sa->key.tfm); free_percpu(sa->stats); kfree(sa);}
static void macsec_rxsa_put(struct macsec_rx_sa *sa){ if (refcount_dec_and_test(&sa->refcnt)) queue_rcu_work(macsec_wq, &sa->destroy_work);}
static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr){ struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
if (!sa || !sa->active) return NULL;
if (!refcount_inc_not_zero(&sa->refcnt)) return NULL;
return sa;}
static void free_txsa_work(struct work_struct *work){ struct macsec_tx_sa *sa = container_of(to_rcu_work(work), struct macsec_tx_sa, destroy_work);
crypto_free_aead(sa->key.tfm); free_percpu(sa->stats); kfree(sa);}
static void macsec_txsa_put(struct macsec_tx_sa *sa){ if (refcount_dec_and_test(&sa->refcnt)) queue_rcu_work(macsec_wq, &sa->destroy_work);}
static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb){ BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); return (struct macsec_cb *)skb->cb;}
#define MACSEC_PORT_SCB (0x0000)#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
#define MACSEC_GCM_AES_128_SAK_LEN 16#define MACSEC_GCM_AES_256_SAK_LEN 32
#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN#define DEFAULT_XPN false#define DEFAULT_SEND_SCI true#define DEFAULT_ENCRYPT false#define DEFAULT_ENCODING_SA 0#define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
static sci_t make_sci(const u8 *addr, __be16 port){ sci_t sci;
memcpy(&sci, addr, ETH_ALEN); memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
return sci;}
static sci_t macsec_active_sci(struct macsec_secy *secy){ struct macsec_rx_sc *rx_sc = rcu_dereference_bh(secy->rx_sc);
/* Case single RX SC */ if (rx_sc && !rcu_dereference_bh(rx_sc->next)) return (rx_sc->active) ? rx_sc->sci : 0; /* Case no RX SC or multiple */ else return 0;}
static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present, struct macsec_rxh_data *rxd){ struct macsec_dev *macsec; sci_t sci = 0;
/* SC = 1 */ if (sci_present) { memcpy(&sci, hdr->secure_channel_id, sizeof(hdr->secure_channel_id)); /* SC = 0; ES = 0 */ } else if ((!(hdr->tci_an & (MACSEC_TCI_ES | MACSEC_TCI_SC))) && (list_is_singular(&rxd->secys))) { /* Only one SECY should exist on this scenario */ macsec = list_first_or_null_rcu(&rxd->secys, struct macsec_dev, secys); if (macsec) return macsec_active_sci(&macsec->secy); } else { sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); }
return sci;}
static unsigned int macsec_sectag_len(bool sci_present){ return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);}
static unsigned int macsec_hdr_len(bool sci_present){ return macsec_sectag_len(sci_present) + ETH_HLEN;}
static unsigned int macsec_extra_len(bool sci_present){ return macsec_sectag_len(sci_present) + sizeof(__be16);}
/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */static void macsec_fill_sectag(struct macsec_eth_header *h, const struct macsec_secy *secy, u32 pn, bool sci_present){ const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
memset(&h->tci_an, 0, macsec_sectag_len(sci_present)); h->eth.h_proto = htons(ETH_P_MACSEC);
if (sci_present) { h->tci_an |= MACSEC_TCI_SC; memcpy(&h->secure_channel_id, &secy->sci, sizeof(h->secure_channel_id)); } else { if (tx_sc->end_station) h->tci_an |= MACSEC_TCI_ES; if (tx_sc->scb) h->tci_an |= MACSEC_TCI_SCB; }
h->packet_number = htonl(pn);
/* with GCM, C/E clear for !encrypt, both set for encrypt */ if (tx_sc->encrypt) h->tci_an |= MACSEC_TCI_CONFID; else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN) h->tci_an |= MACSEC_TCI_C;
h->tci_an |= tx_sc->encoding_sa;}
static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len){ if (data_len < MIN_NON_SHORT_LEN) h->short_length = data_len;}
/* Checks if a MACsec interface is being offloaded to an hardware engine */static bool macsec_is_offloaded(struct macsec_dev *macsec){ if (macsec->offload == MACSEC_OFFLOAD_MAC || macsec->offload == MACSEC_OFFLOAD_PHY) return true;
return false;}
/* Checks if underlying layers implement MACsec offloading functions. */static bool macsec_check_offload(enum macsec_offload offload, struct macsec_dev *macsec){ if (!macsec || !macsec->real_dev) return false;
if (offload == MACSEC_OFFLOAD_PHY) return macsec->real_dev->phydev && macsec->real_dev->phydev->macsec_ops; else if (offload == MACSEC_OFFLOAD_MAC) return macsec->real_dev->features & NETIF_F_HW_MACSEC && macsec->real_dev->macsec_ops;
return false;}
static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload, struct macsec_dev *macsec, struct macsec_context *ctx){ if (ctx) { memset(ctx, 0, sizeof(*ctx)); ctx->offload = offload;
if (offload == MACSEC_OFFLOAD_PHY) ctx->phydev = macsec->real_dev->phydev; else if (offload == MACSEC_OFFLOAD_MAC) ctx->netdev = macsec->real_dev; }
if (offload == MACSEC_OFFLOAD_PHY) return macsec->real_dev->phydev->macsec_ops; else return macsec->real_dev->macsec_ops;}
/* Returns a pointer to the MACsec ops struct if any and updates the MACsec * context device reference if provided. */static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec, struct macsec_context *ctx){ if (!macsec_check_offload(macsec->offload, macsec)) return NULL;
return __macsec_get_ops(macsec->offload, macsec, ctx);}
/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn){ struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; int len = skb->len - 2 * ETH_ALEN; int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
/* a) It comprises at least 17 octets */ if (skb->len <= 16) return false;
/* b) MACsec EtherType: already checked */
/* c) V bit is clear */ if (h->tci_an & MACSEC_TCI_VERSION) return false;
/* d) ES or SCB => !SC */ if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && (h->tci_an & MACSEC_TCI_SC)) return false;
/* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ if (h->unused) return false;
/* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */ if (!h->packet_number && !xpn) return false;
/* length check, f) g) h) i) */ if (h->short_length) return len == extra_len + h->short_length; return len >= extra_len + MIN_NON_SHORT_LEN;}
#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn, salt_t salt){ struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
gcm_iv->ssci = ssci ^ salt.ssci; gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;}
static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn){ struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
gcm_iv->sci = sci; gcm_iv->pn = htonl(pn);}
static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb){ return (struct macsec_eth_header *)skb_mac_header(skb);}
static void __macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa){ pr_debug("PN wrapped, transitioning to !oper\n"); tx_sa->active = false; if (secy->protect_frames) secy->operational = false;}
void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa){ spin_lock_bh(&tx_sa->lock); __macsec_pn_wrapped(secy, tx_sa); spin_unlock_bh(&tx_sa->lock);}EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy){ pn_t pn;
spin_lock_bh(&tx_sa->lock);
pn = tx_sa->next_pn_halves; if (unlikely(pn.full64 == 0)) goto out;
if (secy->xpn) tx_sa->next_pn++; else tx_sa->next_pn_halves.lower++;
if (tx_sa->next_pn == 0) __macsec_pn_wrapped(secy, tx_sa);
out: spin_unlock_bh(&tx_sa->lock);
return pn;}
static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev){ struct macsec_dev *macsec = netdev_priv(dev);
skb->dev = macsec->real_dev; skb_reset_mac_header(skb); skb->protocol = eth_hdr(skb)->h_proto;}
static unsigned int macsec_msdu_len(struct sk_buff *skb){ struct macsec_dev *macsec = macsec_priv(skb->dev); struct macsec_secy *secy = &macsec->secy; bool sci_present = macsec_skb_cb(skb)->has_sci;
return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;}
static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, struct macsec_tx_sa *tx_sa){ unsigned int msdu_len = macsec_msdu_len(skb); struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
u64_stats_update_begin(&txsc_stats->syncp); if (tx_sc->encrypt) { txsc_stats->stats.OutOctetsEncrypted += msdu_len; txsc_stats->stats.OutPktsEncrypted++; this_cpu_inc(tx_sa->stats->OutPktsEncrypted); } else { txsc_stats->stats.OutOctetsProtected += msdu_len; txsc_stats->stats.OutPktsProtected++; this_cpu_inc(tx_sa->stats->OutPktsProtected); } u64_stats_update_end(&txsc_stats->syncp);}
static void count_tx(struct net_device *dev, int ret, int len){ if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) dev_sw_netstats_tx_add(dev, 1, len);}
static void macsec_encrypt_done(void *data, int err){ struct sk_buff *skb = data; struct net_device *dev = skb->dev; struct macsec_dev *macsec = macsec_priv(dev); struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; int len, ret;
aead_request_free(macsec_skb_cb(skb)->req);
rcu_read_lock_bh(); macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); /* packet is encrypted/protected so tx_bytes must be calculated */ len = macsec_msdu_len(skb) + 2 * ETH_ALEN; macsec_encrypt_finish(skb, dev); ret = dev_queue_xmit(skb); count_tx(dev, ret, len); rcu_read_unlock_bh();
macsec_txsa_put(sa); dev_put(dev);}
static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, unsigned char **iv, struct scatterlist **sg, int num_frags){ size_t size, iv_offset, sg_offset; struct aead_request *req; void *tmp;
size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); iv_offset = size; size += GCM_AES_IV_LEN;
size = ALIGN(size, __alignof__(struct scatterlist)); sg_offset = size; size += sizeof(struct scatterlist) * num_frags;
tmp = kmalloc(size, GFP_ATOMIC); if (!tmp) return NULL;
*iv = (unsigned char *)(tmp + iv_offset); *sg = (struct scatterlist *)(tmp + sg_offset); req = tmp;
aead_request_set_tfm(req, tfm);
return req;}
static struct sk_buff *macsec_encrypt(struct sk_buff *skb, struct net_device *dev){ int ret; struct scatterlist *sg; struct sk_buff *trailer; unsigned char *iv; struct ethhdr *eth; struct macsec_eth_header *hh; size_t unprotected_len; struct aead_request *req; struct macsec_secy *secy; struct macsec_tx_sc *tx_sc; struct macsec_tx_sa *tx_sa; struct macsec_dev *macsec = macsec_priv(dev); bool sci_present; pn_t pn;
secy = &macsec->secy; tx_sc = &secy->tx_sc;
/* 10.5.1 TX SA assignment */ tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); if (!tx_sa) { secy->operational = false; kfree_skb(skb); return ERR_PTR(-EINVAL); }
if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { struct sk_buff *nskb = skb_copy_expand(skb, MACSEC_NEEDED_HEADROOM, MACSEC_NEEDED_TAILROOM, GFP_ATOMIC); if (likely(nskb)) { consume_skb(skb); skb = nskb; } else { macsec_txsa_put(tx_sa); kfree_skb(skb); return ERR_PTR(-ENOMEM); } } else { skb = skb_unclone_full(skb, GFP_ATOMIC); if (!skb) { macsec_txsa_put(tx_sa); return ERR_PTR(-ENOMEM); } }
unprotected_len = skb->len; eth = skb_eth_hdr(skb); sci_present = macsec_send_sci(secy); hh = skb_push(skb, macsec_extra_len(sci_present)); memmove(hh, eth, 2 * ETH_ALEN);
pn = tx_sa_update_pn(tx_sa, secy); if (pn.full64 == 0) { macsec_txsa_put(tx_sa); kfree_skb(skb); return ERR_PTR(-ENOLINK); } macsec_fill_sectag(hh, secy, pn.lower, sci_present); macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
skb_put(skb, secy->icv_len);
if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
u64_stats_update_begin(&secy_stats->syncp); secy_stats->stats.OutPktsTooLong++; u64_stats_update_end(&secy_stats->syncp);
macsec_txsa_put(tx_sa); kfree_skb(skb); return ERR_PTR(-EINVAL); }
ret = skb_cow_data(skb, 0, &trailer); if (unlikely(ret < 0)) { macsec_txsa_put(tx_sa); kfree_skb(skb); return ERR_PTR(ret); }
req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret); if (!req) { macsec_txsa_put(tx_sa); kfree_skb(skb); return ERR_PTR(-ENOMEM); }
if (secy->xpn) macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt); else macsec_fill_iv(iv, secy->sci, pn.lower);
sg_init_table(sg, ret); ret = skb_to_sgvec(skb, sg, 0, skb->len); if (unlikely(ret < 0)) { aead_request_free(req); macsec_txsa_put(tx_sa); kfree_skb(skb); return ERR_PTR(ret); }
if (tx_sc->encrypt) { int len = skb->len - macsec_hdr_len(sci_present) - secy->icv_len; aead_request_set_crypt(req, sg, sg, len, iv); aead_request_set_ad(req, macsec_hdr_len(sci_present)); } else { aead_request_set_crypt(req, sg, sg, 0, iv); aead_request_set_ad(req, skb->len - secy->icv_len); }
macsec_skb_cb(skb)->req = req; macsec_skb_cb(skb)->tx_sa = tx_sa; macsec_skb_cb(skb)->has_sci = sci_present; aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
dev_hold(skb->dev); ret = crypto_aead_encrypt(req); if (ret == -EINPROGRESS) { return ERR_PTR(ret); } else if (ret != 0) { dev_put(skb->dev); kfree_skb(skb); aead_request_free(req); macsec_txsa_put(tx_sa); return ERR_PTR(-EINVAL); }
dev_put(skb->dev); aead_request_free(req); macsec_txsa_put(tx_sa);
return skb;}
static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn){ struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); struct macsec_eth_header *hdr = macsec_ethhdr(skb); u32 lowest_pn = 0;
spin_lock(&rx_sa->lock); if (rx_sa->next_pn_halves.lower >= secy->replay_window) lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
/* Now perform replay protection check again * (see IEEE 802.1AE-2006 figure 10-5) */ if (secy->replay_protect && pn < lowest_pn && (!secy->xpn || pn_same_half(pn, lowest_pn))) { spin_unlock(&rx_sa->lock); u64_stats_update_begin(&rxsc_stats->syncp); rxsc_stats->stats.InPktsLate++; u64_stats_update_end(&rxsc_stats->syncp); DEV_STATS_INC(secy->netdev, rx_dropped); return false; }
if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { unsigned int msdu_len = macsec_msdu_len(skb); u64_stats_update_begin(&rxsc_stats->syncp); if (hdr->tci_an & MACSEC_TCI_E) rxsc_stats->stats.InOctetsDecrypted += msdu_len; else rxsc_stats->stats.InOctetsValidated += msdu_len; u64_stats_update_end(&rxsc_stats->syncp); }
if (!macsec_skb_cb(skb)->valid) { spin_unlock(&rx_sa->lock);
/* 10.6.5 */ if (hdr->tci_an & MACSEC_TCI_C || secy->validate_frames == MACSEC_VALIDATE_STRICT) { u64_stats_update_begin(&rxsc_stats->syncp); rxsc_stats->stats.InPktsNotValid++; u64_stats_update_end(&rxsc_stats->syncp); this_cpu_inc(rx_sa->stats->InPktsNotValid); DEV_STATS_INC(secy->netdev, rx_errors); return false; }
u64_stats_update_begin(&rxsc_stats->syncp); if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { rxsc_stats->stats.InPktsInvalid++; this_cpu_inc(rx_sa->stats->InPktsInvalid); } else if (pn < lowest_pn) { rxsc_stats->stats.InPktsDelayed++; } else { rxsc_stats->stats.InPktsUnchecked++; } u64_stats_update_end(&rxsc_stats->syncp); } else { u64_stats_update_begin(&rxsc_stats->syncp); if (pn < lowest_pn) { rxsc_stats->stats.InPktsDelayed++; } else { rxsc_stats->stats.InPktsOK++; this_cpu_inc(rx_sa->stats->InPktsOK); } u64_stats_update_end(&rxsc_stats->syncp);
// Instead of "pn >=" - to support pn overflow in xpn if (pn + 1 > rx_sa->next_pn_halves.lower) { rx_sa->next_pn_halves.lower = pn + 1; } else if (secy->xpn && (pn + 1 == 0 || !pn_same_half(pn, rx_sa->next_pn_halves.lower))) { rx_sa->next_pn_halves.upper++; rx_sa->next_pn_halves.lower = pn + 1; }
spin_unlock(&rx_sa->lock); }
return true;}
static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev){ skb->pkt_type = PACKET_HOST; skb->protocol = eth_type_trans(skb, dev);
skb_reset_network_header(skb); if (!skb_transport_header_was_set(skb)) skb_reset_transport_header(skb); skb_reset_mac_len(skb);}
static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len){ skb->ip_summed = CHECKSUM_NONE; memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); skb_pull(skb, hdr_len); pskb_trim_unique(skb, skb->len - icv_len);}
static void count_rx(struct net_device *dev, int len){ dev_sw_netstats_rx_add(dev, len);}
static void macsec_decrypt_done(void *data, int err){ struct sk_buff *skb = data; struct net_device *dev = skb->dev; struct macsec_dev *macsec = macsec_priv(dev); struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; struct macsec_rx_sc *rx_sc = rx_sa->sc; int len; u32 pn;
aead_request_free(macsec_skb_cb(skb)->req);
if (!err) macsec_skb_cb(skb)->valid = true;
rcu_read_lock_bh(); pn = ntohl(macsec_ethhdr(skb)->packet_number); if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { rcu_read_unlock_bh(); kfree_skb(skb); goto out; }
macsec_finalize_skb(skb, macsec->secy.icv_len, macsec_extra_len(macsec_skb_cb(skb)->has_sci)); len = skb->len; macsec_reset_skb(skb, macsec->secy.netdev);
if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS) count_rx(dev, len);
rcu_read_unlock_bh();
out: macsec_rxsa_put(rx_sa); macsec_rxsc_put(rx_sc); dev_put(dev);}
static struct sk_buff *macsec_decrypt(struct sk_buff *skb, struct net_device *dev, struct macsec_rx_sa *rx_sa, sci_t sci, struct macsec_secy *secy){ int ret; struct scatterlist *sg; struct sk_buff *trailer; unsigned char *iv; struct aead_request *req; struct macsec_eth_header *hdr; u32 hdr_pn; u16 icv_len = secy->icv_len;
macsec_skb_cb(skb)->valid = false; skb = skb_share_check(skb, GFP_ATOMIC); if (!skb) return ERR_PTR(-ENOMEM);
ret = skb_cow_data(skb, 0, &trailer); if (unlikely(ret < 0)) { kfree_skb(skb); return ERR_PTR(ret); } req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret); if (!req) { kfree_skb(skb); return ERR_PTR(-ENOMEM); }
hdr = (struct macsec_eth_header *)skb->data; hdr_pn = ntohl(hdr->packet_number);
if (secy->xpn) { pn_t recovered_pn = rx_sa->next_pn_halves;
recovered_pn.lower = hdr_pn; if (hdr_pn < rx_sa->next_pn_halves.lower && !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower)) recovered_pn.upper++;
macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64, rx_sa->key.salt); } else { macsec_fill_iv(iv, sci, hdr_pn); }
sg_init_table(sg, ret); ret = skb_to_sgvec(skb, sg, 0, skb->len); if (unlikely(ret < 0)) { aead_request_free(req); kfree_skb(skb); return ERR_PTR(ret); }
if (hdr->tci_an & MACSEC_TCI_E) { /* confidentiality: ethernet + macsec header * authenticated, encrypted payload */ int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
aead_request_set_crypt(req, sg, sg, len, iv); aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); skb = skb_unclone_full(skb, GFP_ATOMIC); if (!skb) { aead_request_free(req); return ERR_PTR(-ENOMEM); } } else { /* integrity only: all headers + data authenticated */ aead_request_set_crypt(req, sg, sg, icv_len, iv); aead_request_set_ad(req, skb->len - icv_len); }
macsec_skb_cb(skb)->req = req; skb->dev = dev; aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
dev_hold(dev); ret = crypto_aead_decrypt(req); if (ret == -EINPROGRESS) { return ERR_PTR(ret); } else if (ret != 0) { /* decryption/authentication failed * 10.6 if validateFrames is disabled, deliver anyway */ if (ret != -EBADMSG) { kfree_skb(skb); skb = ERR_PTR(ret); } } else { macsec_skb_cb(skb)->valid = true; } dev_put(dev);
aead_request_free(req);
return skb;}
static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci){ struct macsec_rx_sc *rx_sc;
for_each_rxsc(secy, rx_sc) { if (rx_sc->sci == sci) return rx_sc; }
return NULL;}
static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci){ struct macsec_rx_sc *rx_sc;
for_each_rxsc_rtnl(secy, rx_sc) { if (rx_sc->sci == sci) return rx_sc; }
return NULL;}
static enum rx_handler_result handle_not_macsec(struct sk_buff *skb){ /* Deliver to the uncontrolled port by default */ enum rx_handler_result ret = RX_HANDLER_PASS; struct ethhdr *hdr = eth_hdr(skb); struct metadata_dst *md_dst; struct macsec_rxh_data *rxd; struct macsec_dev *macsec; bool is_macsec_md_dst;
rcu_read_lock(); rxd = macsec_data_rcu(skb->dev); md_dst = skb_metadata_dst(skb); is_macsec_md_dst = md_dst && md_dst->type == METADATA_MACSEC;
list_for_each_entry_rcu(macsec, &rxd->secys, secys) { struct sk_buff *nskb; struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); struct net_device *ndev = macsec->secy.netdev;
/* If h/w offloading is enabled, HW decodes frames and strips * the SecTAG, so we have to deduce which port to deliver to. */ if (macsec_is_offloaded(macsec) && netif_running(ndev)) { const struct macsec_ops *ops;
ops = macsec_get_ops(macsec, NULL);
if (ops->rx_uses_md_dst && !is_macsec_md_dst) continue;
if (is_macsec_md_dst) { struct macsec_rx_sc *rx_sc;
/* All drivers that implement MACsec offload * support using skb metadata destinations must * indicate that they do so. */ DEBUG_NET_WARN_ON_ONCE(!ops->rx_uses_md_dst); rx_sc = find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci); if (!rx_sc) continue; /* device indicated macsec offload occurred */ skb->dev = ndev; skb->pkt_type = PACKET_HOST; eth_skb_pkt_type(skb, ndev); ret = RX_HANDLER_ANOTHER; goto out; }
/* This datapath is insecure because it is unable to * enforce isolation of broadcast/multicast traffic and * unicast traffic with promiscuous mode on the macsec * netdev. Since the core stack has no mechanism to * check that the hardware did indeed receive MACsec * traffic, it is possible that the response handling * done by the MACsec port was to a plaintext packet. * This violates the MACsec protocol standard. */ if (ether_addr_equal_64bits(hdr->h_dest, ndev->dev_addr)) { /* exact match, divert skb to this port */ skb->dev = ndev; skb->pkt_type = PACKET_HOST; ret = RX_HANDLER_ANOTHER; goto out; } else if (is_multicast_ether_addr_64bits( hdr->h_dest)) { /* multicast frame, deliver on this port too */ nskb = skb_clone(skb, GFP_ATOMIC); if (!nskb) break;
nskb->dev = ndev; eth_skb_pkt_type(nskb, ndev);
__netif_rx(nskb); } else if (ndev->flags & IFF_PROMISC) { skb->dev = ndev; skb->pkt_type = PACKET_HOST; ret = RX_HANDLER_ANOTHER; goto out; }
continue; }
/* 10.6 If the management control validateFrames is not * Strict, frames without a SecTAG are received, counted, and * delivered to the Controlled Port */ if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { u64_stats_update_begin(&secy_stats->syncp); secy_stats->stats.InPktsNoTag++; u64_stats_update_end(&secy_stats->syncp); DEV_STATS_INC(macsec->secy.netdev, rx_dropped); continue; }
/* deliver on this port */ nskb = skb_clone(skb, GFP_ATOMIC); if (!nskb) break;
nskb->dev = ndev;
if (__netif_rx(nskb) == NET_RX_SUCCESS) { u64_stats_update_begin(&secy_stats->syncp); secy_stats->stats.InPktsUntagged++; u64_stats_update_end(&secy_stats->syncp); } }
out: rcu_read_unlock(); return ret;}
static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb){ struct sk_buff *skb = *pskb; struct net_device *dev = skb->dev; struct macsec_eth_header *hdr; struct macsec_secy *secy = NULL; struct macsec_rx_sc *rx_sc; struct macsec_rx_sa *rx_sa; struct macsec_rxh_data *rxd; struct macsec_dev *macsec; unsigned int len; sci_t sci = 0; u32 hdr_pn; bool cbit; struct pcpu_rx_sc_stats *rxsc_stats; struct pcpu_secy_stats *secy_stats; bool pulled_sci; int ret;
if (skb_headroom(skb) < ETH_HLEN) goto drop_direct;
hdr = macsec_ethhdr(skb); if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) return handle_not_macsec(skb);
skb = skb_unclone_full(skb, GFP_ATOMIC); *pskb = skb; if (!skb) return RX_HANDLER_CONSUMED;
pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); if (!pulled_sci) { if (!pskb_may_pull(skb, macsec_extra_len(false))) goto drop_direct; }
hdr = macsec_ethhdr(skb);
/* Frames with a SecTAG that has the TCI E bit set but the C * bit clear are discarded, as this reserved encoding is used * to identify frames with a SecTAG that are not to be * delivered to the Controlled Port. */ if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) return RX_HANDLER_PASS;
/* now, pull the extra length */ if (hdr->tci_an & MACSEC_TCI_SC) { if (!pulled_sci) goto drop_direct; }
/* ethernet header is part of crypto processing */ skb_push(skb, ETH_HLEN);
macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
rcu_read_lock(); rxd = macsec_data_rcu(skb->dev);
sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci, rxd); if (!sci) goto drop_nosc;
list_for_each_entry_rcu(macsec, &rxd->secys, secys) { struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
sc = sc ? macsec_rxsc_get(sc) : NULL;
if (sc) { secy = &macsec->secy; rx_sc = sc; break; } }
if (!secy) goto nosci;
dev = secy->netdev; macsec = macsec_priv(dev); secy_stats = this_cpu_ptr(macsec->stats); rxsc_stats = this_cpu_ptr(rx_sc->stats);
if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) { u64_stats_update_begin(&secy_stats->syncp); secy_stats->stats.InPktsBadTag++; u64_stats_update_end(&secy_stats->syncp); DEV_STATS_INC(secy->netdev, rx_errors); goto drop_nosa; }
rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); if (!rx_sa) { /* 10.6.1 if the SA is not in use */
/* If validateFrames is Strict or the C bit in the * SecTAG is set, discard */ if (hdr->tci_an & MACSEC_TCI_C || secy->validate_frames == MACSEC_VALIDATE_STRICT) { u64_stats_update_begin(&rxsc_stats->syncp); rxsc_stats->stats.InPktsNotUsingSA++; u64_stats_update_end(&rxsc_stats->syncp); DEV_STATS_INC(secy->netdev, rx_errors); goto drop_nosa; }
/* not Strict, the frame (with the SecTAG and ICV * removed) is delivered to the Controlled Port. */ u64_stats_update_begin(&rxsc_stats->syncp); rxsc_stats->stats.InPktsUnusedSA++; u64_stats_update_end(&rxsc_stats->syncp); goto deliver; }
/* First, PN check to avoid decrypting obviously wrong packets */ hdr_pn = ntohl(hdr->packet_number); if (secy->replay_protect) { bool late;
spin_lock(&rx_sa->lock); late = rx_sa->next_pn_halves.lower >= secy->replay_window && hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
if (secy->xpn) late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn); spin_unlock(&rx_sa->lock);
if (late) { u64_stats_update_begin(&rxsc_stats->syncp); rxsc_stats->stats.InPktsLate++; u64_stats_update_end(&rxsc_stats->syncp); DEV_STATS_INC(macsec->secy.netdev, rx_dropped); goto drop; } }
macsec_skb_cb(skb)->rx_sa = rx_sa;
/* Disabled && !changed text => skip validation */ if (hdr->tci_an & MACSEC_TCI_C || secy->validate_frames != MACSEC_VALIDATE_DISABLED) skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
if (IS_ERR(skb)) { /* the decrypt callback needs the reference */ if (PTR_ERR(skb) != -EINPROGRESS) { macsec_rxsa_put(rx_sa); macsec_rxsc_put(rx_sc); } rcu_read_unlock(); *pskb = NULL; return RX_HANDLER_CONSUMED; }
if (!macsec_post_decrypt(skb, secy, hdr_pn)) goto drop;
deliver: macsec_finalize_skb(skb, secy->icv_len, macsec_extra_len(macsec_skb_cb(skb)->has_sci)); len = skb->len; macsec_reset_skb(skb, secy->netdev);
if (rx_sa) macsec_rxsa_put(rx_sa); macsec_rxsc_put(rx_sc);
skb_orphan(skb); ret = gro_cells_receive(&macsec->gro_cells, skb); if (ret == NET_RX_SUCCESS) count_rx(dev, len); else DEV_STATS_INC(macsec->secy.netdev, rx_dropped);
rcu_read_unlock();
*pskb = NULL; return RX_HANDLER_CONSUMED;
drop: macsec_rxsa_put(rx_sa);drop_nosa: macsec_rxsc_put(rx_sc);drop_nosc: rcu_read_unlock();drop_direct: kfree_skb(skb); *pskb = NULL; return RX_HANDLER_CONSUMED;
nosci: /* 10.6.1 if the SC is not found */ cbit = !!(hdr->tci_an & MACSEC_TCI_C); if (!cbit) macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN, macsec_extra_len(macsec_skb_cb(skb)->has_sci));
list_for_each_entry_rcu(macsec, &rxd->secys, secys) { struct sk_buff *nskb;
secy_stats = this_cpu_ptr(macsec->stats);
/* If validateFrames is Strict or the C bit in the * SecTAG is set, discard */ if (cbit || macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { u64_stats_update_begin(&secy_stats->syncp); secy_stats->stats.InPktsNoSCI++; u64_stats_update_end(&secy_stats->syncp); DEV_STATS_INC(macsec->secy.netdev, rx_errors); continue; }
/* not strict, the frame (with the SecTAG and ICV * removed) is delivered to the Controlled Port. */ nskb = skb_clone(skb, GFP_ATOMIC); if (!nskb) break;
macsec_reset_skb(nskb, macsec->secy.netdev);
ret = __netif_rx(nskb); if (ret == NET_RX_SUCCESS) { u64_stats_update_begin(&secy_stats->syncp); secy_stats->stats.InPktsUnknownSCI++; u64_stats_update_end(&secy_stats->syncp); } else { DEV_STATS_INC(macsec->secy.netdev, rx_dropped); } }
rcu_read_unlock(); *pskb = skb; return RX_HANDLER_PASS;}
static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len){ struct crypto_aead *tfm; int ret;
tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
if (IS_ERR(tfm)) return tfm;
ret = crypto_aead_setkey(tfm, key, key_len); if (ret < 0) goto fail;
ret = crypto_aead_setauthsize(tfm, icv_len); if (ret < 0) goto fail;
return tfm;fail: crypto_free_aead(tfm); return ERR_PTR(ret);}
static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, int icv_len){ rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); if (!rx_sa->stats) return -ENOMEM;
rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); if (IS_ERR(rx_sa->key.tfm)) { free_percpu(rx_sa->stats); return PTR_ERR(rx_sa->key.tfm); }
rx_sa->ssci = MACSEC_UNDEF_SSCI; rx_sa->active = false; rx_sa->next_pn = 1; refcount_set(&rx_sa->refcnt, 1); spin_lock_init(&rx_sa->lock); INIT_RCU_WORK(&rx_sa->destroy_work, free_rxsa_work);
return 0;}
static void clear_rx_sa(struct macsec_rx_sa *rx_sa){ rx_sa->active = false;
macsec_rxsa_put(rx_sa);}
static void free_rx_sc(struct macsec_rx_sc *rx_sc){ int i;
for (i = 0; i < MACSEC_NUM_AN; i++) { struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
RCU_INIT_POINTER(rx_sc->sa[i], NULL); if (sa) clear_rx_sa(sa); }
macsec_rxsc_put(rx_sc);}
static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci){ struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); rx_sc; rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { if (rx_sc->sci == sci) { if (rx_sc->active) secy->n_rx_sc--; rcu_assign_pointer(*rx_scp, rx_sc->next); return rx_sc; } }
return NULL;}
static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci, bool active){ struct macsec_rx_sc *rx_sc; struct macsec_dev *macsec; struct net_device *real_dev = macsec_priv(dev)->real_dev; struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); struct macsec_secy *secy;
list_for_each_entry(macsec, &rxd->secys, secys) { if (find_rx_sc_rtnl(&macsec->secy, sci)) return ERR_PTR(-EEXIST); }
rx_sc = kzalloc_obj(*rx_sc); if (!rx_sc) return ERR_PTR(-ENOMEM);
rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); if (!rx_sc->stats) { kfree(rx_sc); return ERR_PTR(-ENOMEM); }
rx_sc->sci = sci; rx_sc->active = active; refcount_set(&rx_sc->refcnt, 1);
secy = &macsec_priv(dev)->secy; rcu_assign_pointer(rx_sc->next, secy->rx_sc); rcu_assign_pointer(secy->rx_sc, rx_sc);
if (rx_sc->active) secy->n_rx_sc++;
return rx_sc;}
static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, int icv_len){ tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); if (!tx_sa->stats) return -ENOMEM;
tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); if (IS_ERR(tx_sa->key.tfm)) { free_percpu(tx_sa->stats); return PTR_ERR(tx_sa->key.tfm); }
tx_sa->ssci = MACSEC_UNDEF_SSCI; tx_sa->active = false; refcount_set(&tx_sa->refcnt, 1); spin_lock_init(&tx_sa->lock); INIT_RCU_WORK(&tx_sa->destroy_work, free_txsa_work);
return 0;}
static void clear_tx_sa(struct macsec_tx_sa *tx_sa){ tx_sa->active = false;
macsec_txsa_put(tx_sa);}
static struct genl_family macsec_fam;
static struct net_device *get_dev_from_nl(struct net *net, struct nlattr **attrs){ int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); struct net_device *dev;
dev = __dev_get_by_index(net, ifindex); if (!dev) return ERR_PTR(-ENODEV);
if (!netif_is_macsec(dev)) return ERR_PTR(-ENODEV);
return dev;}
static enum macsec_offload nla_get_offload(const struct nlattr *nla){ return (__force enum macsec_offload)nla_get_u8(nla);}
static sci_t nla_get_sci(const struct nlattr *nla){ return (__force sci_t)nla_get_u64(nla);}
static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, int padattr){ return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);}
static ssci_t nla_get_ssci(const struct nlattr *nla){ return (__force ssci_t)nla_get_u32(nla);}
static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value){ return nla_put_u32(skb, attrtype, (__force u64)value);}
static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, struct nlattr **attrs, struct nlattr **tb_sa, struct net_device **devp, struct macsec_secy **secyp, struct macsec_tx_sc **scp, u8 *assoc_num){ struct net_device *dev; struct macsec_secy *secy; struct macsec_tx_sc *tx_sc; struct macsec_tx_sa *tx_sa;
if (!tb_sa[MACSEC_SA_ATTR_AN]) return ERR_PTR(-EINVAL);
*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
dev = get_dev_from_nl(net, attrs); if (IS_ERR(dev)) return ERR_CAST(dev);
secy = &macsec_priv(dev)->secy; tx_sc = &secy->tx_sc;
tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); if (!tx_sa) return ERR_PTR(-ENODEV);
*devp = dev; *scp = tx_sc; *secyp = secy; return tx_sa;}
static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, struct nlattr **attrs, struct nlattr **tb_rxsc, struct net_device **devp, struct macsec_secy **secyp){ struct net_device *dev; struct macsec_secy *secy; struct macsec_rx_sc *rx_sc; sci_t sci;
dev = get_dev_from_nl(net, attrs); if (IS_ERR(dev)) return ERR_CAST(dev);
secy = &macsec_priv(dev)->secy;
if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) return ERR_PTR(-EINVAL);
sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); rx_sc = find_rx_sc_rtnl(secy, sci); if (!rx_sc) return ERR_PTR(-ENODEV);
*secyp = secy; *devp = dev;
return rx_sc;}
static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, struct nlattr **attrs, struct nlattr **tb_rxsc, struct nlattr **tb_sa, struct net_device **devp, struct macsec_secy **secyp, struct macsec_rx_sc **scp, u8 *assoc_num){ struct macsec_rx_sc *rx_sc; struct macsec_rx_sa *rx_sa;
if (!tb_sa[MACSEC_SA_ATTR_AN]) return ERR_PTR(-EINVAL);
*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); if (IS_ERR(rx_sc)) return ERR_CAST(rx_sc);
rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); if (!rx_sa) return ERR_PTR(-ENODEV);
*scp = rx_sc; return rx_sa;}
static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },};
static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, [MACSEC_RXSC_ATTR_ACTIVE] = NLA_POLICY_MAX(NLA_U8, 1),};
static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { [MACSEC_SA_ATTR_AN] = NLA_POLICY_MAX(NLA_U8, MACSEC_NUM_AN - 1), [MACSEC_SA_ATTR_ACTIVE] = NLA_POLICY_MAX(NLA_U8, 1), [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN(NLA_UINT, 1), [MACSEC_SA_ATTR_KEYID] = NLA_POLICY_EXACT_LEN(MACSEC_KEYID_LEN), [MACSEC_SA_ATTR_KEY] = NLA_POLICY_MAX_LEN(MACSEC_MAX_KEY_LEN), [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 }, [MACSEC_SA_ATTR_SALT] = NLA_POLICY_EXACT_LEN(MACSEC_SALT_LEN),};
static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = { [MACSEC_OFFLOAD_ATTR_TYPE] = NLA_POLICY_MAX(NLA_U8, MACSEC_OFFLOAD_MAX),};
/* Offloads an operation to a device driver */static int macsec_offload(int (* const func)(struct macsec_context *), struct macsec_context *ctx){ int ret;
if (unlikely(!func)) return 0;
if (ctx->offload == MACSEC_OFFLOAD_PHY) mutex_lock(&ctx->phydev->lock);
ret = (*func)(ctx);
if (ctx->offload == MACSEC_OFFLOAD_PHY) mutex_unlock(&ctx->phydev->lock);
return ret;}
static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa){ if (!attrs[MACSEC_ATTR_SA_CONFIG]) return -EINVAL;
if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL)) return -EINVAL;
return 0;}
static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc){ if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) return -EINVAL;
if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL)) return -EINVAL;
return 0;}
static bool validate_add_rxsa(struct nlattr **attrs){ if (!attrs[MACSEC_SA_ATTR_AN] || !attrs[MACSEC_SA_ATTR_KEY] || !attrs[MACSEC_SA_ATTR_KEYID]) return false;
return true;}
static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info){ struct net_device *dev; struct nlattr **attrs = info->attrs; struct macsec_secy *secy; struct macsec_rx_sc *rx_sc; struct macsec_rx_sa *rx_sa; unsigned char assoc_num; int pn_len; struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; int err;
if (!attrs[MACSEC_ATTR_IFINDEX]) return -EINVAL;
if (parse_sa_config(attrs, tb_sa)) return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc)) return -EINVAL;
if (!validate_add_rxsa(tb_sa)) return -EINVAL;
rtnl_lock(); rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); if (IS_ERR(rx_sc)) { rtnl_unlock(); return PTR_ERR(rx_sc); }
assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); rtnl_unlock(); return -EINVAL; }
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; if (tb_sa[MACSEC_SA_ATTR_PN] && nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n", nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); rtnl_unlock(); return -EINVAL; }
if (secy->xpn) { if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { rtnl_unlock(); return -EINVAL; } }
rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); if (rx_sa) { rtnl_unlock(); return -EBUSY; }
rx_sa = kmalloc_obj(*rx_sa); if (!rx_sa) { rtnl_unlock(); return -ENOMEM; }
err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len, secy->icv_len); if (err < 0) { kfree(rx_sa); rtnl_unlock(); return err; }
if (tb_sa[MACSEC_SA_ATTR_PN]) { spin_lock_bh(&rx_sa->lock); rx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); spin_unlock_bh(&rx_sa->lock); }
if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
rx_sa->sc = rx_sc;
if (secy->xpn) { rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], MACSEC_SALT_LEN); }
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(netdev_priv(dev))) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { err = -EOPNOTSUPP; goto cleanup; }
ctx.sa.assoc_num = assoc_num; ctx.sa.rx_sa = rx_sa; ctx.secy = secy; memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
err = macsec_offload(ops->mdo_add_rxsa, &ctx); memzero_explicit(ctx.sa.key, secy->key_len); if (err) goto cleanup; }
nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
rtnl_unlock();
return 0;
cleanup: macsec_rxsa_put(rx_sa); rtnl_unlock(); return err;}
static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info){ struct net_device *dev; sci_t sci = MACSEC_UNDEF_SCI; struct nlattr **attrs = info->attrs; struct macsec_rx_sc *rx_sc; struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; struct macsec_secy *secy; bool active = true; int ret;
if (!attrs[MACSEC_ATTR_IFINDEX]) return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc)) return -EINVAL;
if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) return -EINVAL;
rtnl_lock(); dev = get_dev_from_nl(genl_info_net(info), attrs); if (IS_ERR(dev)) { rtnl_unlock(); return PTR_ERR(dev); }
secy = &macsec_priv(dev)->secy; sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
rx_sc = create_rx_sc(dev, sci, active); if (IS_ERR(rx_sc)) { rtnl_unlock(); return PTR_ERR(rx_sc); }
if (macsec_is_offloaded(netdev_priv(dev))) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { ret = -EOPNOTSUPP; goto cleanup; }
ctx.rx_sc = rx_sc; ctx.secy = secy;
ret = macsec_offload(ops->mdo_add_rxsc, &ctx); if (ret) goto cleanup; }
rtnl_unlock();
return 0;
cleanup: del_rx_sc(secy, sci); free_rx_sc(rx_sc); rtnl_unlock(); return ret;}
static bool validate_add_txsa(struct nlattr **attrs){ if (!attrs[MACSEC_SA_ATTR_AN] || !attrs[MACSEC_SA_ATTR_PN] || !attrs[MACSEC_SA_ATTR_KEY] || !attrs[MACSEC_SA_ATTR_KEYID]) return false;
return true;}
static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info){ struct net_device *dev; struct nlattr **attrs = info->attrs; struct macsec_secy *secy; struct macsec_tx_sc *tx_sc; struct macsec_tx_sa *tx_sa; unsigned char assoc_num; int pn_len; struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; bool was_operational; int err;
if (!attrs[MACSEC_ATTR_IFINDEX]) return -EINVAL;
if (parse_sa_config(attrs, tb_sa)) return -EINVAL;
if (!validate_add_txsa(tb_sa)) return -EINVAL;
rtnl_lock(); dev = get_dev_from_nl(genl_info_net(info), attrs); if (IS_ERR(dev)) { rtnl_unlock(); return PTR_ERR(dev); }
secy = &macsec_priv(dev)->secy; tx_sc = &secy->tx_sc;
assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); rtnl_unlock(); return -EINVAL; }
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n", nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); rtnl_unlock(); return -EINVAL; }
if (secy->xpn) { if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) { rtnl_unlock(); return -EINVAL; } }
tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); if (tx_sa) { rtnl_unlock(); return -EBUSY; }
tx_sa = kmalloc_obj(*tx_sa); if (!tx_sa) { rtnl_unlock(); return -ENOMEM; }
err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len, secy->icv_len); if (err < 0) { kfree(tx_sa); rtnl_unlock(); return err; }
spin_lock_bh(&tx_sa->lock); tx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); spin_unlock_bh(&tx_sa->lock);
if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
was_operational = secy->operational; if (assoc_num == tx_sc->encoding_sa && tx_sa->active) secy->operational = true;
if (secy->xpn) { tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]); nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT], MACSEC_SALT_LEN); }
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(netdev_priv(dev))) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { err = -EOPNOTSUPP; goto cleanup; }
ctx.sa.assoc_num = assoc_num; ctx.sa.tx_sa = tx_sa; ctx.secy = secy; memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
err = macsec_offload(ops->mdo_add_txsa, &ctx); memzero_explicit(ctx.sa.key, secy->key_len); if (err) goto cleanup; }
nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
rtnl_unlock();
return 0;
cleanup: secy->operational = was_operational; macsec_txsa_put(tx_sa); rtnl_unlock(); return err;}
static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info){ struct nlattr **attrs = info->attrs; struct net_device *dev; struct macsec_secy *secy; struct macsec_rx_sc *rx_sc; struct macsec_rx_sa *rx_sa; u8 assoc_num; struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; int ret;
if (!attrs[MACSEC_ATTR_IFINDEX]) return -EINVAL;
if (parse_sa_config(attrs, tb_sa)) return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc)) return -EINVAL;
rtnl_lock(); rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, &dev, &secy, &rx_sc, &assoc_num); if (IS_ERR(rx_sa)) { rtnl_unlock(); return PTR_ERR(rx_sa); }
if (rx_sa->active) { rtnl_unlock(); return -EBUSY; }
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(netdev_priv(dev))) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { ret = -EOPNOTSUPP; goto cleanup; }
ctx.sa.assoc_num = assoc_num; ctx.sa.rx_sa = rx_sa; ctx.secy = secy;
ret = macsec_offload(ops->mdo_del_rxsa, &ctx); if (ret) goto cleanup; }
RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); clear_rx_sa(rx_sa);
rtnl_unlock();
return 0;
cleanup: rtnl_unlock(); return ret;}
static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info){ struct nlattr **attrs = info->attrs; struct net_device *dev; struct macsec_secy *secy; struct macsec_rx_sc *rx_sc; sci_t sci; struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; int ret;
if (!attrs[MACSEC_ATTR_IFINDEX]) return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc)) return -EINVAL;
if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) return -EINVAL;
rtnl_lock(); dev = get_dev_from_nl(genl_info_net(info), info->attrs); if (IS_ERR(dev)) { rtnl_unlock(); return PTR_ERR(dev); }
secy = &macsec_priv(dev)->secy; sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
rx_sc = del_rx_sc(secy, sci); if (!rx_sc) { rtnl_unlock(); return -ENODEV; }
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(netdev_priv(dev))) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { ret = -EOPNOTSUPP; goto cleanup; }
ctx.rx_sc = rx_sc; ctx.secy = secy; ret = macsec_offload(ops->mdo_del_rxsc, &ctx); if (ret) goto cleanup; }
free_rx_sc(rx_sc); rtnl_unlock();
return 0;
cleanup: rtnl_unlock(); return ret;}
static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info){ struct nlattr **attrs = info->attrs; struct net_device *dev; struct macsec_secy *secy; struct macsec_tx_sc *tx_sc; struct macsec_tx_sa *tx_sa; u8 assoc_num; struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; int ret;
if (!attrs[MACSEC_ATTR_IFINDEX]) return -EINVAL;
if (parse_sa_config(attrs, tb_sa)) return -EINVAL;
rtnl_lock(); tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, &dev, &secy, &tx_sc, &assoc_num); if (IS_ERR(tx_sa)) { rtnl_unlock(); return PTR_ERR(tx_sa); }
if (tx_sa->active) { rtnl_unlock(); return -EBUSY; }
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(netdev_priv(dev))) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { ret = -EOPNOTSUPP; goto cleanup; }
ctx.sa.assoc_num = assoc_num; ctx.sa.tx_sa = tx_sa; ctx.secy = secy;
ret = macsec_offload(ops->mdo_del_txsa, &ctx); if (ret) goto cleanup; }
RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); clear_tx_sa(tx_sa);
rtnl_unlock();
return 0;
cleanup: rtnl_unlock(); return ret;}
static bool validate_upd_sa(struct nlattr **attrs){ if (!attrs[MACSEC_SA_ATTR_AN] || attrs[MACSEC_SA_ATTR_KEY] || attrs[MACSEC_SA_ATTR_KEYID] || attrs[MACSEC_SA_ATTR_SSCI] || attrs[MACSEC_SA_ATTR_SALT]) return false;
return true;}
static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info){ struct nlattr **attrs = info->attrs; struct net_device *dev; struct macsec_secy *secy; struct macsec_tx_sc *tx_sc; struct macsec_tx_sa *tx_sa; u8 assoc_num; struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; bool was_operational, was_active; pn_t prev_pn; int ret = 0;
prev_pn.full64 = 0;
if (!attrs[MACSEC_ATTR_IFINDEX]) return -EINVAL;
if (parse_sa_config(attrs, tb_sa)) return -EINVAL;
if (!validate_upd_sa(tb_sa)) return -EINVAL;
rtnl_lock(); tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, &dev, &secy, &tx_sc, &assoc_num); if (IS_ERR(tx_sa)) { rtnl_unlock(); return PTR_ERR(tx_sa); }
if (tb_sa[MACSEC_SA_ATTR_PN]) { int pn_len;
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n", nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); rtnl_unlock(); return -EINVAL; }
spin_lock_bh(&tx_sa->lock); prev_pn = tx_sa->next_pn_halves; tx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); spin_unlock_bh(&tx_sa->lock); }
was_active = tx_sa->active; if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
was_operational = secy->operational; if (assoc_num == tx_sc->encoding_sa) secy->operational = tx_sa->active;
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(netdev_priv(dev))) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { ret = -EOPNOTSUPP; goto cleanup; }
ctx.sa.assoc_num = assoc_num; ctx.sa.tx_sa = tx_sa; ctx.sa.update_pn = !!prev_pn.full64; ctx.secy = secy;
ret = macsec_offload(ops->mdo_upd_txsa, &ctx); if (ret) goto cleanup; }
rtnl_unlock();
return 0;
cleanup: if (tb_sa[MACSEC_SA_ATTR_PN]) { spin_lock_bh(&tx_sa->lock); tx_sa->next_pn_halves = prev_pn; spin_unlock_bh(&tx_sa->lock); } tx_sa->active = was_active; secy->operational = was_operational; rtnl_unlock(); return ret;}
static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info){ struct nlattr **attrs = info->attrs; struct net_device *dev; struct macsec_secy *secy; struct macsec_rx_sc *rx_sc; struct macsec_rx_sa *rx_sa; u8 assoc_num; struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; bool was_active; pn_t prev_pn; int ret = 0;
prev_pn.full64 = 0;
if (!attrs[MACSEC_ATTR_IFINDEX]) return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc)) return -EINVAL;
if (parse_sa_config(attrs, tb_sa)) return -EINVAL;
if (!validate_upd_sa(tb_sa)) return -EINVAL;
rtnl_lock(); rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, &dev, &secy, &rx_sc, &assoc_num); if (IS_ERR(rx_sa)) { rtnl_unlock(); return PTR_ERR(rx_sa); }
if (tb_sa[MACSEC_SA_ATTR_PN]) { int pn_len;
pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN; if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) { pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n", nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len); rtnl_unlock(); return -EINVAL; }
spin_lock_bh(&rx_sa->lock); prev_pn = rx_sa->next_pn_halves; rx_sa->next_pn = nla_get_uint(tb_sa[MACSEC_SA_ATTR_PN]); spin_unlock_bh(&rx_sa->lock); }
was_active = rx_sa->active; if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(netdev_priv(dev))) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { ret = -EOPNOTSUPP; goto cleanup; }
ctx.sa.assoc_num = assoc_num; ctx.sa.rx_sa = rx_sa; ctx.sa.update_pn = !!prev_pn.full64; ctx.secy = secy;
ret = macsec_offload(ops->mdo_upd_rxsa, &ctx); if (ret) goto cleanup; }
rtnl_unlock(); return 0;
cleanup: if (tb_sa[MACSEC_SA_ATTR_PN]) { spin_lock_bh(&rx_sa->lock); rx_sa->next_pn_halves = prev_pn; spin_unlock_bh(&rx_sa->lock); } rx_sa->active = was_active; rtnl_unlock(); return ret;}
static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info){ struct nlattr **attrs = info->attrs; struct net_device *dev; struct macsec_secy *secy; struct macsec_rx_sc *rx_sc; struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; unsigned int prev_n_rx_sc; bool was_active; int ret;
if (!attrs[MACSEC_ATTR_IFINDEX]) return -EINVAL;
if (parse_rxsc_config(attrs, tb_rxsc)) return -EINVAL;
if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) return -EINVAL;
rtnl_lock(); rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); if (IS_ERR(rx_sc)) { rtnl_unlock(); return PTR_ERR(rx_sc); }
was_active = rx_sc->active; prev_n_rx_sc = secy->n_rx_sc; if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
if (rx_sc->active != new) secy->n_rx_sc += new ? 1 : -1;
rx_sc->active = new; }
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(netdev_priv(dev))) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { ret = -EOPNOTSUPP; goto cleanup; }
ctx.rx_sc = rx_sc; ctx.secy = secy;
ret = macsec_offload(ops->mdo_upd_rxsc, &ctx); if (ret) goto cleanup; }
rtnl_unlock();
return 0;
cleanup: secy->n_rx_sc = prev_n_rx_sc; rx_sc->active = was_active; rtnl_unlock(); return ret;}
static bool macsec_is_configured(struct macsec_dev *macsec){ struct macsec_secy *secy = &macsec->secy; struct macsec_tx_sc *tx_sc = &secy->tx_sc; int i;
if (secy->rx_sc) return true;
for (i = 0; i < MACSEC_NUM_AN; i++) if (tx_sc->sa[i]) return true;
return false;}
static bool macsec_needs_tx_tag(struct macsec_dev *macsec, const struct macsec_ops *ops){ return macsec->offload == MACSEC_OFFLOAD_PHY && ops->mdo_insert_tx_tag;}
static void macsec_set_head_tail_room(struct net_device *dev){ struct macsec_dev *macsec = macsec_priv(dev); struct net_device *real_dev = macsec->real_dev; int needed_headroom, needed_tailroom; const struct macsec_ops *ops;
ops = macsec_get_ops(macsec, NULL); if (ops) { needed_headroom = ops->needed_headroom; needed_tailroom = ops->needed_tailroom; } else { needed_headroom = MACSEC_NEEDED_HEADROOM; needed_tailroom = MACSEC_NEEDED_TAILROOM; }
dev->needed_headroom = real_dev->needed_headroom + needed_headroom; dev->needed_tailroom = real_dev->needed_tailroom + needed_tailroom;}
static void macsec_inherit_tso_max(struct net_device *dev){ struct macsec_dev *macsec = macsec_priv(dev);
/* if macsec is offloaded, we need to follow the lower * device's capabilities. otherwise, we can ignore them. */ if (macsec_is_offloaded(macsec)) netif_inherit_tso_max(dev, macsec->real_dev);}
static int macsec_update_offload(struct net_device *dev, enum macsec_offload offload, struct netlink_ext_ack *extack){ enum macsec_offload prev_offload; const struct macsec_ops *ops; struct macsec_context ctx; struct macsec_dev *macsec; int ret = 0;
macsec = macsec_priv(dev);
/* Check if the offloading mode is supported by the underlying layers */ if (offload != MACSEC_OFFLOAD_OFF && !macsec_check_offload(offload, macsec)) return -EOPNOTSUPP;
/* Check if the net device is busy. */ if (netif_running(dev)) return -EBUSY;
/* Check if the device already has rules configured: we do not support * rules migration. */ if (macsec_is_configured(macsec)) return -EBUSY;
prev_offload = macsec->offload;
ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload, macsec, &ctx); if (!ops) return -EOPNOTSUPP;
ctx.secy = &macsec->secy; ret = offload == MACSEC_OFFLOAD_OFF ? macsec_offload(ops->mdo_del_secy, &ctx) : macsec_offload(ops->mdo_add_secy, &ctx); if (ret) return ret;
/* Remove VLAN filters when disabling offload. */ if (offload == MACSEC_OFFLOAD_OFF) { vlan_drop_rx_ctag_filter_info(dev); vlan_drop_rx_stag_filter_info(dev); } WRITE_ONCE(macsec->offload, offload); /* Add VLAN filters when enabling offload. */ if (prev_offload == MACSEC_OFFLOAD_OFF) { ret = vlan_get_rx_ctag_filter_info(dev); if (ret) { NL_SET_ERR_MSG_FMT(extack, "adding ctag VLAN filters failed, err %d", ret); goto rollback_offload; } ret = vlan_get_rx_stag_filter_info(dev); if (ret) { NL_SET_ERR_MSG_FMT(extack, "adding stag VLAN filters failed, err %d", ret); vlan_drop_rx_ctag_filter_info(dev); goto rollback_offload; } }
macsec_set_head_tail_room(dev); macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops);
macsec_inherit_tso_max(dev);
netdev_update_features(dev);
return 0;
rollback_offload: WRITE_ONCE(macsec->offload, prev_offload); macsec_offload(ops->mdo_del_secy, &ctx);
return ret;}
static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info){ struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1]; struct nlattr **attrs = info->attrs; enum macsec_offload offload; struct macsec_dev *macsec; struct net_device *dev; int ret = 0;
if (!attrs[MACSEC_ATTR_IFINDEX]) return -EINVAL;
if (!attrs[MACSEC_ATTR_OFFLOAD]) return -EINVAL;
if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX, attrs[MACSEC_ATTR_OFFLOAD], macsec_genl_offload_policy, NULL)) return -EINVAL;
rtnl_lock();
dev = get_dev_from_nl(genl_info_net(info), attrs); if (IS_ERR(dev)) { ret = PTR_ERR(dev); goto out; } macsec = macsec_priv(dev);
if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) { ret = -EINVAL; goto out; }
offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
if (macsec->offload != offload) ret = macsec_update_offload(dev, offload, info->extack);out: rtnl_unlock(); return ret;}
static void get_tx_sa_stats(struct net_device *dev, int an, struct macsec_tx_sa *tx_sa, struct macsec_tx_sa_stats *sum){ struct macsec_dev *macsec = macsec_priv(dev); int cpu;
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(macsec)) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx); if (ops) { ctx.sa.assoc_num = an; ctx.sa.tx_sa = tx_sa; ctx.stats.tx_sa_stats = sum; ctx.secy = &macsec_priv(dev)->secy; macsec_offload(ops->mdo_get_tx_sa_stats, &ctx); } return; }
for_each_possible_cpu(cpu) { const struct macsec_tx_sa_stats *stats = per_cpu_ptr(tx_sa->stats, cpu);
sum->OutPktsProtected += stats->OutPktsProtected; sum->OutPktsEncrypted += stats->OutPktsEncrypted; }}
static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum){ if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum->OutPktsProtected) || nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum->OutPktsEncrypted)) return -EMSGSIZE;
return 0;}
static void get_rx_sa_stats(struct net_device *dev, struct macsec_rx_sc *rx_sc, int an, struct macsec_rx_sa *rx_sa, struct macsec_rx_sa_stats *sum){ struct macsec_dev *macsec = macsec_priv(dev); int cpu;
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(macsec)) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx); if (ops) { ctx.sa.assoc_num = an; ctx.sa.rx_sa = rx_sa; ctx.stats.rx_sa_stats = sum; ctx.secy = &macsec_priv(dev)->secy; ctx.rx_sc = rx_sc; macsec_offload(ops->mdo_get_rx_sa_stats, &ctx); } return; }
for_each_possible_cpu(cpu) { const struct macsec_rx_sa_stats *stats = per_cpu_ptr(rx_sa->stats, cpu);
sum->InPktsOK += stats->InPktsOK; sum->InPktsInvalid += stats->InPktsInvalid; sum->InPktsNotValid += stats->InPktsNotValid; sum->InPktsNotUsingSA += stats->InPktsNotUsingSA; sum->InPktsUnusedSA += stats->InPktsUnusedSA; }}
static int copy_rx_sa_stats(struct sk_buff *skb, struct macsec_rx_sa_stats *sum){ if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) || nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum->InPktsInvalid) || nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum->InPktsNotValid) || nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum->InPktsNotUsingSA) || nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum->InPktsUnusedSA)) return -EMSGSIZE;
return 0;}
static void get_rx_sc_stats(struct net_device *dev, struct macsec_rx_sc *rx_sc, struct macsec_rx_sc_stats *sum){ struct macsec_dev *macsec = macsec_priv(dev); int cpu;
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(macsec)) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx); if (ops) { ctx.stats.rx_sc_stats = sum; ctx.secy = &macsec_priv(dev)->secy; ctx.rx_sc = rx_sc; macsec_offload(ops->mdo_get_rx_sc_stats, &ctx); } return; }
for_each_possible_cpu(cpu) { const struct pcpu_rx_sc_stats *stats; struct macsec_rx_sc_stats tmp; unsigned int start;
stats = per_cpu_ptr(rx_sc->stats, cpu); do { start = u64_stats_fetch_begin(&stats->syncp); u64_stats_copy(&tmp, &stats->stats, sizeof(tmp)); } while (u64_stats_fetch_retry(&stats->syncp, start));
sum->InOctetsValidated += tmp.InOctetsValidated; sum->InOctetsDecrypted += tmp.InOctetsDecrypted; sum->InPktsUnchecked += tmp.InPktsUnchecked; sum->InPktsDelayed += tmp.InPktsDelayed; sum->InPktsOK += tmp.InPktsOK; sum->InPktsInvalid += tmp.InPktsInvalid; sum->InPktsLate += tmp.InPktsLate; sum->InPktsNotValid += tmp.InPktsNotValid; sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA; sum->InPktsUnusedSA += tmp.InPktsUnusedSA; }}
static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum){ if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, sum->InOctetsValidated, MACSEC_RXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, sum->InOctetsDecrypted, MACSEC_RXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, sum->InPktsUnchecked, MACSEC_RXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, sum->InPktsDelayed, MACSEC_RXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK, MACSEC_RXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, sum->InPktsInvalid, MACSEC_RXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, sum->InPktsLate, MACSEC_RXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, sum->InPktsNotValid, MACSEC_RXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum->InPktsNotUsingSA, MACSEC_RXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, sum->InPktsUnusedSA, MACSEC_RXSC_STATS_ATTR_PAD)) return -EMSGSIZE;
return 0;}
static void get_tx_sc_stats(struct net_device *dev, struct macsec_tx_sc_stats *sum){ struct macsec_dev *macsec = macsec_priv(dev); int cpu;
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(macsec)) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx); if (ops) { ctx.stats.tx_sc_stats = sum; ctx.secy = &macsec_priv(dev)->secy; macsec_offload(ops->mdo_get_tx_sc_stats, &ctx); } return; }
for_each_possible_cpu(cpu) { const struct pcpu_tx_sc_stats *stats; struct macsec_tx_sc_stats tmp; unsigned int start;
stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu); do { start = u64_stats_fetch_begin(&stats->syncp); u64_stats_copy(&tmp, &stats->stats, sizeof(tmp)); } while (u64_stats_fetch_retry(&stats->syncp, start));
sum->OutPktsProtected += tmp.OutPktsProtected; sum->OutPktsEncrypted += tmp.OutPktsEncrypted; sum->OutOctetsProtected += tmp.OutOctetsProtected; sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted; }}
static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum){ if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, sum->OutPktsProtected, MACSEC_TXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum->OutPktsEncrypted, MACSEC_TXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, sum->OutOctetsProtected, MACSEC_TXSC_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, sum->OutOctetsEncrypted, MACSEC_TXSC_STATS_ATTR_PAD)) return -EMSGSIZE;
return 0;}
static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum){ struct macsec_dev *macsec = macsec_priv(dev); int cpu;
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(macsec)) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx); if (ops) { ctx.stats.dev_stats = sum; ctx.secy = &macsec_priv(dev)->secy; macsec_offload(ops->mdo_get_dev_stats, &ctx); } return; }
for_each_possible_cpu(cpu) { const struct pcpu_secy_stats *stats; struct macsec_dev_stats tmp; unsigned int start;
stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu); do { start = u64_stats_fetch_begin(&stats->syncp); u64_stats_copy(&tmp, &stats->stats, sizeof(tmp)); } while (u64_stats_fetch_retry(&stats->syncp, start));
sum->OutPktsUntagged += tmp.OutPktsUntagged; sum->InPktsUntagged += tmp.InPktsUntagged; sum->OutPktsTooLong += tmp.OutPktsTooLong; sum->InPktsNoTag += tmp.InPktsNoTag; sum->InPktsBadTag += tmp.InPktsBadTag; sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI; sum->InPktsNoSCI += tmp.InPktsNoSCI; sum->InPktsOverrun += tmp.InPktsOverrun; }}
static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum){ if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, sum->OutPktsUntagged, MACSEC_SECY_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, sum->InPktsUntagged, MACSEC_SECY_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, sum->OutPktsTooLong, MACSEC_SECY_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, sum->InPktsNoTag, MACSEC_SECY_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, sum->InPktsBadTag, MACSEC_SECY_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, sum->InPktsUnknownSCI, MACSEC_SECY_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, sum->InPktsNoSCI, MACSEC_SECY_STATS_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, sum->InPktsOverrun, MACSEC_SECY_STATS_ATTR_PAD)) return -EMSGSIZE;
return 0;}
static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb){ struct macsec_tx_sc *tx_sc = &secy->tx_sc; struct nlattr *secy_nest = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY); u64 csid;
if (!secy_nest) return 1;
switch (secy->key_len) { case MACSEC_GCM_AES_128_SAK_LEN: csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; break; case MACSEC_GCM_AES_256_SAK_LEN: csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; break; default: goto cancel; }
if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, MACSEC_SECY_ATTR_PAD) || nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, csid, MACSEC_SECY_ATTR_PAD) || nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) goto cancel;
if (secy->replay_protect) { if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) goto cancel; }
nla_nest_end(skb, secy_nest); return 0;
cancel: nla_nest_cancel(skb, secy_nest); return 1;}
static noinline_for_stack intdump_secy(struct macsec_secy *secy, struct net_device *dev, struct sk_buff *skb, struct netlink_callback *cb){ struct macsec_tx_sc_stats tx_sc_stats = {0, }; struct macsec_tx_sa_stats tx_sa_stats = {0, }; struct macsec_rx_sc_stats rx_sc_stats = {0, }; struct macsec_rx_sa_stats rx_sa_stats = {0, }; struct macsec_dev *macsec = netdev_priv(dev); struct macsec_dev_stats dev_stats = {0, }; struct macsec_tx_sc *tx_sc = &secy->tx_sc; struct nlattr *txsa_list, *rxsc_list; struct macsec_rx_sc *rx_sc; struct nlattr *attr; void *hdr; int i, j;
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); if (!hdr) return -EMSGSIZE;
genl_dump_check_consistent(cb, hdr);
if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) goto nla_put_failure;
attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD); if (!attr) goto nla_put_failure; if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload)) goto nla_put_failure; nla_nest_end(skb, attr);
if (nla_put_secy(secy, skb)) goto nla_put_failure;
attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS); if (!attr) goto nla_put_failure;
get_tx_sc_stats(dev, &tx_sc_stats); if (copy_tx_sc_stats(skb, &tx_sc_stats)) { nla_nest_cancel(skb, attr); goto nla_put_failure; } nla_nest_end(skb, attr);
attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS); if (!attr) goto nla_put_failure; get_secy_stats(dev, &dev_stats); if (copy_secy_stats(skb, &dev_stats)) { nla_nest_cancel(skb, attr); goto nla_put_failure; } nla_nest_end(skb, attr);
txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST); if (!txsa_list) goto nla_put_failure; for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); struct nlattr *txsa_nest; u64 pn; int pn_len;
if (!tx_sa) continue;
txsa_nest = nla_nest_start_noflag(skb, j++); if (!txsa_nest) { nla_nest_cancel(skb, txsa_list); goto nla_put_failure; }
attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); if (!attr) { nla_nest_cancel(skb, txsa_nest); nla_nest_cancel(skb, txsa_list); goto nla_put_failure; } memset(&tx_sa_stats, 0, sizeof(tx_sa_stats)); get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats); if (copy_tx_sa_stats(skb, &tx_sa_stats)) { nla_nest_cancel(skb, attr); nla_nest_cancel(skb, txsa_nest); nla_nest_cancel(skb, txsa_list); goto nla_put_failure; } nla_nest_end(skb, attr);
if (secy->xpn) { pn = tx_sa->next_pn; pn_len = MACSEC_XPN_PN_LEN; } else { pn = tx_sa->next_pn_halves.lower; pn_len = MACSEC_DEFAULT_PN_LEN; }
if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) || nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { nla_nest_cancel(skb, txsa_nest); nla_nest_cancel(skb, txsa_list); goto nla_put_failure; }
nla_nest_end(skb, txsa_nest); } nla_nest_end(skb, txsa_list);
rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST); if (!rxsc_list) goto nla_put_failure;
j = 1; for_each_rxsc_rtnl(secy, rx_sc) { int k; struct nlattr *rxsa_list; struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
if (!rxsc_nest) { nla_nest_cancel(skb, rxsc_list); goto nla_put_failure; }
if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, MACSEC_RXSC_ATTR_PAD)) { nla_nest_cancel(skb, rxsc_nest); nla_nest_cancel(skb, rxsc_list); goto nla_put_failure; }
attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS); if (!attr) { nla_nest_cancel(skb, rxsc_nest); nla_nest_cancel(skb, rxsc_list); goto nla_put_failure; } memset(&rx_sc_stats, 0, sizeof(rx_sc_stats)); get_rx_sc_stats(dev, rx_sc, &rx_sc_stats); if (copy_rx_sc_stats(skb, &rx_sc_stats)) { nla_nest_cancel(skb, attr); nla_nest_cancel(skb, rxsc_nest); nla_nest_cancel(skb, rxsc_list); goto nla_put_failure; } nla_nest_end(skb, attr);
rxsa_list = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_SA_LIST); if (!rxsa_list) { nla_nest_cancel(skb, rxsc_nest); nla_nest_cancel(skb, rxsc_list); goto nla_put_failure; }
for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); struct nlattr *rxsa_nest; u64 pn; int pn_len;
if (!rx_sa) continue;
rxsa_nest = nla_nest_start_noflag(skb, k++); if (!rxsa_nest) { nla_nest_cancel(skb, rxsa_list); nla_nest_cancel(skb, rxsc_nest); nla_nest_cancel(skb, rxsc_list); goto nla_put_failure; }
attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS); if (!attr) { nla_nest_cancel(skb, rxsa_list); nla_nest_cancel(skb, rxsc_nest); nla_nest_cancel(skb, rxsc_list); goto nla_put_failure; } memset(&rx_sa_stats, 0, sizeof(rx_sa_stats)); get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats); if (copy_rx_sa_stats(skb, &rx_sa_stats)) { nla_nest_cancel(skb, attr); nla_nest_cancel(skb, rxsa_list); nla_nest_cancel(skb, rxsc_nest); nla_nest_cancel(skb, rxsc_list); goto nla_put_failure; } nla_nest_end(skb, attr);
if (secy->xpn) { pn = rx_sa->next_pn; pn_len = MACSEC_XPN_PN_LEN; } else { pn = rx_sa->next_pn_halves.lower; pn_len = MACSEC_DEFAULT_PN_LEN; }
if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) || nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) || nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { nla_nest_cancel(skb, rxsa_nest); nla_nest_cancel(skb, rxsc_nest); nla_nest_cancel(skb, rxsc_list); goto nla_put_failure; } nla_nest_end(skb, rxsa_nest); }
nla_nest_end(skb, rxsa_list); nla_nest_end(skb, rxsc_nest); }
nla_nest_end(skb, rxsc_list);
genlmsg_end(skb, hdr);
return 0;
nla_put_failure: genlmsg_cancel(skb, hdr); return -EMSGSIZE;}
static int macsec_generation = 1; /* protected by RTNL */
static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb){ struct net *net = sock_net(skb->sk); struct net_device *dev; int dev_idx, d;
dev_idx = cb->args[0];
d = 0; rtnl_lock();
cb->seq = macsec_generation;
for_each_netdev(net, dev) { struct macsec_secy *secy;
if (d < dev_idx) goto next;
if (!netif_is_macsec(dev)) goto next;
secy = &macsec_priv(dev)->secy; if (dump_secy(secy, dev, skb, cb) < 0) goto done;next: d++; }
done: rtnl_unlock(); cb->args[0] = d; return skb->len;}
static const struct genl_small_ops macsec_genl_ops[] = { { .cmd = MACSEC_CMD_GET_TXSC, .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .dumpit = macsec_dump_txsc, }, { .cmd = MACSEC_CMD_ADD_RXSC, .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .doit = macsec_add_rxsc, .flags = GENL_ADMIN_PERM, }, { .cmd = MACSEC_CMD_DEL_RXSC, .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .doit = macsec_del_rxsc, .flags = GENL_ADMIN_PERM, }, { .cmd = MACSEC_CMD_UPD_RXSC, .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .doit = macsec_upd_rxsc, .flags = GENL_ADMIN_PERM, }, { .cmd = MACSEC_CMD_ADD_TXSA, .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .doit = macsec_add_txsa, .flags = GENL_ADMIN_PERM, }, { .cmd = MACSEC_CMD_DEL_TXSA, .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .doit = macsec_del_txsa, .flags = GENL_ADMIN_PERM, }, { .cmd = MACSEC_CMD_UPD_TXSA, .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .doit = macsec_upd_txsa, .flags = GENL_ADMIN_PERM, }, { .cmd = MACSEC_CMD_ADD_RXSA, .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .doit = macsec_add_rxsa, .flags = GENL_ADMIN_PERM, }, { .cmd = MACSEC_CMD_DEL_RXSA, .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .doit = macsec_del_rxsa, .flags = GENL_ADMIN_PERM, }, { .cmd = MACSEC_CMD_UPD_RXSA, .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .doit = macsec_upd_rxsa, .flags = GENL_ADMIN_PERM, }, { .cmd = MACSEC_CMD_UPD_OFFLOAD, .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, .doit = macsec_upd_offload, .flags = GENL_ADMIN_PERM, },};
static struct genl_family macsec_fam __ro_after_init = { .name = MACSEC_GENL_NAME, .hdrsize = 0, .version = MACSEC_GENL_VERSION, .maxattr = MACSEC_ATTR_MAX, .policy = macsec_genl_policy, .netnsok = true, .module = THIS_MODULE, .small_ops = macsec_genl_ops, .n_small_ops = ARRAY_SIZE(macsec_genl_ops), .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1,};
static struct sk_buff *macsec_insert_tx_tag(struct sk_buff *skb, struct net_device *dev){ struct macsec_dev *macsec = macsec_priv(dev); const struct macsec_ops *ops; struct phy_device *phydev; struct macsec_context ctx; int skb_final_len; int err;
ops = macsec_get_ops(macsec, &ctx); skb_final_len = skb->len - ETH_HLEN + ops->needed_headroom + ops->needed_tailroom; if (unlikely(skb_final_len > macsec->real_dev->mtu)) { err = -EINVAL; goto cleanup; }
phydev = macsec->real_dev->phydev;
err = skb_ensure_writable_head_tail(skb, dev); if (unlikely(err < 0)) goto cleanup;
err = ops->mdo_insert_tx_tag(phydev, skb); if (unlikely(err)) goto cleanup;
return skb;cleanup: kfree_skb(skb); return ERR_PTR(err);}
static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, struct net_device *dev){ struct macsec_dev *macsec = netdev_priv(dev); struct macsec_secy *secy = &macsec->secy; struct pcpu_secy_stats *secy_stats; int ret, len;
if (macsec_is_offloaded(netdev_priv(dev))) { struct metadata_dst *md_dst = secy->tx_sc.md_dst;
skb_dst_drop(skb); dst_hold(&md_dst->dst); skb_dst_set(skb, &md_dst->dst);
if (macsec->insert_tx_tag) { skb = macsec_insert_tx_tag(skb, dev); if (IS_ERR(skb)) { DEV_STATS_INC(dev, tx_dropped); return NETDEV_TX_OK; } }
skb->dev = macsec->real_dev; return dev_queue_xmit(skb); }
/* 10.5 */ if (!secy->protect_frames) { secy_stats = this_cpu_ptr(macsec->stats); u64_stats_update_begin(&secy_stats->syncp); secy_stats->stats.OutPktsUntagged++; u64_stats_update_end(&secy_stats->syncp); skb->dev = macsec->real_dev; len = skb->len; ret = dev_queue_xmit(skb); count_tx(dev, ret, len); return ret; }
if (!secy->operational) { kfree_skb(skb); DEV_STATS_INC(dev, tx_dropped); return NETDEV_TX_OK; }
len = skb->len; skb = macsec_encrypt(skb, dev); if (IS_ERR(skb)) { if (PTR_ERR(skb) != -EINPROGRESS) DEV_STATS_INC(dev, tx_dropped); return NETDEV_TX_OK; }
macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
macsec_encrypt_finish(skb, dev); ret = dev_queue_xmit(skb); count_tx(dev, ret, len); return ret;}
#define MACSEC_FEATURES \ (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST | \ NETIF_F_HW_VLAN_STAG_FILTER | NETIF_F_HW_VLAN_CTAG_FILTER)
#define MACSEC_OFFLOAD_FEATURES \ (MACSEC_FEATURES | NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES | \ NETIF_F_LRO | NETIF_F_RXHASH | NETIF_F_CSUM_MASK | NETIF_F_RXCSUM)
static int macsec_dev_init(struct net_device *dev){ struct macsec_dev *macsec = macsec_priv(dev); struct net_device *real_dev = macsec->real_dev; int err;
err = gro_cells_init(&macsec->gro_cells, dev); if (err) return err;
err = -ENOMEM; macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); if (!macsec->stats) goto destroy_gro_cells;
macsec->secy.tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); if (!macsec->secy.tx_sc.stats) goto free_secy_stats;
macsec->secy.tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL); if (!macsec->secy.tx_sc.md_dst) goto free_tx_sc_stats; macsec->secy.tx_sc.md_dst->u.macsec_info.sci = macsec->secy.sci;
macsec_inherit_tso_max(dev);
dev->hw_features = real_dev->hw_features & MACSEC_OFFLOAD_FEATURES; dev->hw_features |= NETIF_F_GSO_SOFTWARE;
dev->features = real_dev->features & MACSEC_OFFLOAD_FEATURES; dev->features |= NETIF_F_GSO_SOFTWARE; dev->lltx = true; dev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
macsec_set_head_tail_room(dev);
if (is_zero_ether_addr(dev->broadcast)) memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
/* Get macsec's reference to real_dev */ netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
return 0;
free_tx_sc_stats: free_percpu(macsec->secy.tx_sc.stats);free_secy_stats: free_percpu(macsec->stats);destroy_gro_cells: gro_cells_destroy(&macsec->gro_cells); return err;}
static void macsec_dev_uninit(struct net_device *dev){ struct macsec_dev *macsec = macsec_priv(dev);
gro_cells_destroy(&macsec->gro_cells);}
static netdev_features_t macsec_fix_features(struct net_device *dev, netdev_features_t features){ struct macsec_dev *macsec = macsec_priv(dev); struct net_device *real_dev = macsec->real_dev; netdev_features_t mask;
mask = macsec_is_offloaded(macsec) ? MACSEC_OFFLOAD_FEATURES : MACSEC_FEATURES;
features &= (real_dev->features & mask) | NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
return features;}
static int macsec_dev_open(struct net_device *dev){ struct macsec_dev *macsec = macsec_priv(dev); struct net_device *real_dev = macsec->real_dev; int err;
err = dev_uc_add(real_dev, dev->dev_addr); if (err < 0) return err;
if (dev->flags & IFF_ALLMULTI) { err = dev_set_allmulti(real_dev, 1); if (err < 0) goto del_unicast; }
if (dev->flags & IFF_PROMISC) { err = dev_set_promiscuity(real_dev, 1); if (err < 0) goto clear_allmulti; }
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(macsec)) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { err = -EOPNOTSUPP; goto clear_promisc; }
ctx.secy = &macsec->secy; err = macsec_offload(ops->mdo_dev_open, &ctx); if (err) goto clear_promisc; }
if (netif_carrier_ok(real_dev)) netif_carrier_on(dev);
return 0;clear_promisc: if (dev->flags & IFF_PROMISC) dev_set_promiscuity(real_dev, -1);clear_allmulti: if (dev->flags & IFF_ALLMULTI) dev_set_allmulti(real_dev, -1);del_unicast: dev_uc_del(real_dev, dev->dev_addr); netif_carrier_off(dev); return err;}
static int macsec_dev_stop(struct net_device *dev){ struct macsec_dev *macsec = macsec_priv(dev); struct net_device *real_dev = macsec->real_dev;
netif_carrier_off(dev);
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(macsec)) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx); if (ops) { ctx.secy = &macsec->secy; macsec_offload(ops->mdo_dev_stop, &ctx); } }
dev_mc_unsync(real_dev, dev); dev_uc_unsync(real_dev, dev);
if (dev->flags & IFF_ALLMULTI) dev_set_allmulti(real_dev, -1);
if (dev->flags & IFF_PROMISC) dev_set_promiscuity(real_dev, -1);
dev_uc_del(real_dev, dev->dev_addr);
return 0;}
static void macsec_dev_change_rx_flags(struct net_device *dev, int change){ struct net_device *real_dev = macsec_priv(dev)->real_dev;
if (!(dev->flags & IFF_UP)) return;
if (change & IFF_ALLMULTI) dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
if (change & IFF_PROMISC) dev_set_promiscuity(real_dev, dev->flags & IFF_PROMISC ? 1 : -1);}
static void macsec_dev_set_rx_mode(struct net_device *dev){ struct net_device *real_dev = macsec_priv(dev)->real_dev;
dev_mc_sync(real_dev, dev); dev_uc_sync(real_dev, dev);}
static int macsec_set_mac_address(struct net_device *dev, void *p){ struct macsec_dev *macsec = macsec_priv(dev); struct net_device *real_dev = macsec->real_dev; struct sockaddr *addr = p; u8 old_addr[ETH_ALEN]; int err;
if (!is_valid_ether_addr(addr->sa_data)) return -EADDRNOTAVAIL;
if (dev->flags & IFF_UP) { err = dev_uc_add(real_dev, addr->sa_data); if (err < 0) return err; }
ether_addr_copy(old_addr, dev->dev_addr); eth_hw_addr_set(dev, addr->sa_data);
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(macsec)) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx); if (!ops) { err = -EOPNOTSUPP; goto restore_old_addr; }
ctx.secy = &macsec->secy; err = macsec_offload(ops->mdo_upd_secy, &ctx); if (err) goto restore_old_addr; }
if (dev->flags & IFF_UP) dev_uc_del(real_dev, old_addr);
return 0;
restore_old_addr: if (dev->flags & IFF_UP) dev_uc_del(real_dev, addr->sa_data);
eth_hw_addr_set(dev, old_addr);
return err;}
static int macsec_vlan_rx_add_vid(struct net_device *dev, __be16 proto, u16 vid){ struct macsec_dev *macsec = netdev_priv(dev);
if (!macsec_is_offloaded(macsec)) return 0;
return vlan_vid_add(macsec->real_dev, proto, vid);}
static int macsec_vlan_rx_kill_vid(struct net_device *dev, __be16 proto, u16 vid){ struct macsec_dev *macsec = netdev_priv(dev);
if (!macsec_is_offloaded(macsec)) return 0;
vlan_vid_del(macsec->real_dev, proto, vid); 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;
WRITE_ONCE(dev->mtu, new_mtu);
return 0;}
static void macsec_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *s){ if (!dev->tstats) return;
dev_fetch_sw_netstats(s, dev->tstats);
s->rx_dropped = DEV_STATS_READ(dev, rx_dropped); s->tx_dropped = DEV_STATS_READ(dev, tx_dropped); s->rx_errors = DEV_STATS_READ(dev, rx_errors);}
static int macsec_get_iflink(const struct net_device *dev){ return READ_ONCE(macsec_priv(dev)->real_dev->ifindex);}
static const struct net_device_ops macsec_netdev_ops = { .ndo_init = macsec_dev_init, .ndo_uninit = macsec_dev_uninit, .ndo_open = macsec_dev_open, .ndo_stop = macsec_dev_stop, .ndo_fix_features = macsec_fix_features, .ndo_change_mtu = macsec_change_mtu, .ndo_set_rx_mode = macsec_dev_set_rx_mode, .ndo_change_rx_flags = macsec_dev_change_rx_flags, .ndo_set_mac_address = macsec_set_mac_address, .ndo_vlan_rx_add_vid = macsec_vlan_rx_add_vid, .ndo_vlan_rx_kill_vid = macsec_vlan_rx_kill_vid, .ndo_start_xmit = macsec_start_xmit, .ndo_get_stats64 = macsec_get_stats64, .ndo_get_iflink = macsec_get_iflink,};
static const struct device_type macsec_type = { .name = "macsec",};
static int validate_cipher_suite(const struct nlattr *attr, struct netlink_ext_ack *extack);static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, [IFLA_MACSEC_PORT] = { .type = NLA_U16 }, [IFLA_MACSEC_ICV_LEN] = NLA_POLICY_RANGE(NLA_U8, MACSEC_MIN_ICV_LEN, MACSEC_STD_ICV_LEN), [IFLA_MACSEC_CIPHER_SUITE] = NLA_POLICY_VALIDATE_FN(NLA_U64, validate_cipher_suite), [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, [IFLA_MACSEC_ENCODING_SA] = NLA_POLICY_MAX(NLA_U8, MACSEC_NUM_AN - 1), [IFLA_MACSEC_ENCRYPT] = NLA_POLICY_MAX(NLA_U8, 1), [IFLA_MACSEC_PROTECT] = NLA_POLICY_MAX(NLA_U8, 1), [IFLA_MACSEC_INC_SCI] = NLA_POLICY_MAX(NLA_U8, 1), [IFLA_MACSEC_ES] = NLA_POLICY_MAX(NLA_U8, 1), [IFLA_MACSEC_SCB] = NLA_POLICY_MAX(NLA_U8, 1), [IFLA_MACSEC_REPLAY_PROTECT] = NLA_POLICY_MAX(NLA_U8, 1), [IFLA_MACSEC_VALIDATION] = NLA_POLICY_MAX(NLA_U8, MACSEC_VALIDATE_MAX), [IFLA_MACSEC_OFFLOAD] = NLA_POLICY_MAX(NLA_U8, MACSEC_OFFLOAD_MAX),};
static void macsec_free_netdev(struct net_device *dev){ struct macsec_dev *macsec = macsec_priv(dev);
dst_release(&macsec->secy.tx_sc.md_dst->dst); free_percpu(macsec->stats); free_percpu(macsec->secy.tx_sc.stats);
/* Get rid of the macsec's reference to real_dev */ netdev_put(macsec->real_dev, &macsec->dev_tracker);}
static void macsec_setup(struct net_device *dev){ ether_setup(dev); dev->min_mtu = 0; dev->max_mtu = ETH_MAX_MTU; dev->priv_flags |= IFF_NO_QUEUE | IFF_UNICAST_FLT; dev->netdev_ops = &macsec_netdev_ops; dev->needs_free_netdev = true; dev->priv_destructor = macsec_free_netdev; SET_NETDEV_DEVTYPE(dev, &macsec_type);
eth_zero_addr(dev->broadcast);}
static int macsec_changelink_common(struct net_device *dev, struct nlattr *data[]){ struct macsec_secy *secy; struct macsec_tx_sc *tx_sc;
secy = &macsec_priv(dev)->secy; tx_sc = &secy->tx_sc;
if (data[IFLA_MACSEC_ENCODING_SA]) { struct macsec_tx_sa *tx_sa; u8 encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
WRITE_ONCE(tx_sc->encoding_sa, encoding_sa); tx_sa = rtnl_dereference(tx_sc->sa[encoding_sa]);
secy->operational = tx_sa && tx_sa->active; }
if (data[IFLA_MACSEC_ENCRYPT]) WRITE_ONCE(tx_sc->encrypt, !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]));
if (data[IFLA_MACSEC_PROTECT]) WRITE_ONCE(secy->protect_frames, !!nla_get_u8(data[IFLA_MACSEC_PROTECT]));
if (data[IFLA_MACSEC_INC_SCI]) WRITE_ONCE(tx_sc->send_sci, !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]));
if (data[IFLA_MACSEC_ES]) WRITE_ONCE(tx_sc->end_station, !!nla_get_u8(data[IFLA_MACSEC_ES]));
if (data[IFLA_MACSEC_SCB]) WRITE_ONCE(tx_sc->scb, !!nla_get_u8(data[IFLA_MACSEC_SCB]));
if (data[IFLA_MACSEC_REPLAY_PROTECT]) WRITE_ONCE(secy->replay_protect, !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]));
if (data[IFLA_MACSEC_VALIDATION]) WRITE_ONCE(secy->validate_frames, nla_get_u8(data[IFLA_MACSEC_VALIDATION]));
if (data[IFLA_MACSEC_CIPHER_SUITE]) { switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) { case MACSEC_CIPHER_ID_GCM_AES_128: case MACSEC_DEFAULT_CIPHER_ID: WRITE_ONCE(secy->key_len, MACSEC_GCM_AES_128_SAK_LEN); WRITE_ONCE(secy->xpn, false); break; case MACSEC_CIPHER_ID_GCM_AES_256: WRITE_ONCE(secy->key_len, MACSEC_GCM_AES_256_SAK_LEN); WRITE_ONCE(secy->xpn, false); break; case MACSEC_CIPHER_ID_GCM_AES_XPN_128: WRITE_ONCE(secy->key_len, MACSEC_GCM_AES_128_SAK_LEN); WRITE_ONCE(secy->xpn, true); break; case MACSEC_CIPHER_ID_GCM_AES_XPN_256: WRITE_ONCE(secy->key_len, MACSEC_GCM_AES_256_SAK_LEN); WRITE_ONCE(secy->xpn, true); break; default: return -EINVAL; } }
if (data[IFLA_MACSEC_WINDOW]) { u32 replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
/* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window * for XPN cipher suites */ if (secy->xpn && replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW) return -EINVAL; WRITE_ONCE(secy->replay_window, replay_window); }
return 0;}
/* Both a change of the offload state (mdo_add_secy()/mdo_del_secy()) and * any request against an already offloaded device (mdo_upd_secy()) reach * the driver of real_dev, which may live in a different network namespace * from the macsec device. Require CAP_NET_ADMIN over real_dev's namespace * for those; local attributes of a non-offloaded device are unaffected. */static int macsec_changelink_check_netns(struct net_device *dev, struct nlattr *data[], struct netlink_ext_ack *extack){ struct macsec_dev *macsec = macsec_priv(dev); bool reaches_real_dev;
reaches_real_dev = macsec_is_offloaded(macsec); if (data[IFLA_MACSEC_OFFLOAD] && nla_get_u8(data[IFLA_MACSEC_OFFLOAD]) != macsec->offload) reaches_real_dev = true;
if (!reaches_real_dev || rtnl_dev_link_net_capable(dev, dev_net(macsec->real_dev))) return 0;
NL_SET_ERR_MSG(extack, "Changing a MACsec device whose real device is in another network namespace requires CAP_NET_ADMIN in that namespace"); return -EPERM;}
static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack){ struct macsec_dev *macsec = macsec_priv(dev); bool macsec_offload_state_change = false; enum macsec_offload offload; struct macsec_tx_sc tx_sc; struct macsec_secy secy; int ret;
if (!data) return 0;
ret = macsec_changelink_check_netns(dev, data, extack); if (ret) return ret;
if (data[IFLA_MACSEC_CIPHER_SUITE] || data[IFLA_MACSEC_ICV_LEN] || data[IFLA_MACSEC_SCI] || data[IFLA_MACSEC_PORT]) return -EINVAL;
/* Keep a copy of unmodified secy and tx_sc, in case the offload * propagation fails, to revert macsec_changelink_common. */ memcpy(&secy, &macsec->secy, sizeof(secy)); memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
ret = macsec_changelink_common(dev, data); if (ret) goto cleanup;
if (data[IFLA_MACSEC_OFFLOAD]) { offload = nla_get_u8(data[IFLA_MACSEC_OFFLOAD]); if (macsec->offload != offload) { macsec_offload_state_change = true; ret = macsec_update_offload(dev, offload, extack); if (ret) goto cleanup; } }
/* If h/w offloading is available, propagate to the device */ if (!macsec_offload_state_change && macsec_is_offloaded(macsec)) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (!ops) { ret = -EOPNOTSUPP; goto cleanup; }
ctx.secy = &macsec->secy; ret = macsec_offload(ops->mdo_upd_secy, &ctx); if (ret) goto cleanup; }
return 0;
cleanup: memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc)); memcpy(&macsec->secy, &secy, sizeof(secy));
return ret;}
static void macsec_del_dev(struct macsec_dev *macsec){ int i;
while (macsec->secy.rx_sc) { struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); free_rx_sc(rx_sc); }
for (i = 0; i < MACSEC_NUM_AN; i++) { struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
if (sa) { RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); clear_tx_sa(sa); } }}
static void macsec_common_dellink(struct net_device *dev, struct list_head *head){ struct macsec_dev *macsec = macsec_priv(dev); struct net_device *real_dev = macsec->real_dev;
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(macsec)) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(netdev_priv(dev), &ctx); if (ops) { ctx.secy = &macsec->secy; macsec_offload(ops->mdo_del_secy, &ctx); } }
unregister_netdevice_queue(dev, head); list_del_rcu(&macsec->secys); macsec_del_dev(macsec); netdev_upper_dev_unlink(real_dev, dev);
macsec_generation++;}
static void macsec_dellink(struct net_device *dev, struct list_head *head){ struct macsec_dev *macsec = macsec_priv(dev); struct net_device *real_dev = macsec->real_dev; struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
macsec_common_dellink(dev, head);
if (list_empty(&rxd->secys)) { netdev_rx_handler_unregister(real_dev); kfree(rxd); }}
static int register_macsec_dev(struct net_device *real_dev, struct net_device *dev){ struct macsec_dev *macsec = macsec_priv(dev); struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
if (!rxd) { int err;
rxd = kmalloc_obj(*rxd); if (!rxd) return -ENOMEM;
INIT_LIST_HEAD(&rxd->secys);
err = netdev_rx_handler_register(real_dev, macsec_handle_frame, rxd); if (err < 0) { kfree(rxd); return err; } }
list_add_tail_rcu(&macsec->secys, &rxd->secys); return 0;}
static bool sci_exists(struct net_device *dev, sci_t sci){ struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); struct macsec_dev *macsec;
list_for_each_entry(macsec, &rxd->secys, secys) { if (macsec->secy.sci == sci) return true; }
return false;}
static sci_t dev_to_sci(struct net_device *dev, __be16 port){ return make_sci(dev->dev_addr, port);}
static void macsec_init_secy(struct net_device *dev, sci_t sci, u8 icv_len){ struct macsec_dev *macsec = macsec_priv(dev); struct macsec_secy *secy = &macsec->secy;
secy->netdev = dev; secy->operational = true; secy->key_len = DEFAULT_SAK_LEN; secy->icv_len = icv_len; secy->validate_frames = MACSEC_VALIDATE_DEFAULT; secy->protect_frames = true; secy->replay_protect = false; secy->xpn = DEFAULT_XPN;
secy->sci = sci; secy->tx_sc.active = true; secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; secy->tx_sc.encrypt = DEFAULT_ENCRYPT; secy->tx_sc.send_sci = DEFAULT_SEND_SCI; secy->tx_sc.end_station = false; secy->tx_sc.scb = false;}
static struct lock_class_key macsec_netdev_addr_lock_key;
static int macsec_newlink(struct net_device *dev, struct rtnl_newlink_params *params, struct netlink_ext_ack *extack){ struct net *link_net = rtnl_newlink_link_net(params); struct macsec_dev *macsec = macsec_priv(dev); struct nlattr **data = params->data; struct nlattr **tb = params->tb; rx_handler_func_t *rx_handler; u8 icv_len = MACSEC_DEFAULT_ICV_LEN; struct net_device *real_dev; int err, mtu; sci_t sci = MACSEC_UNDEF_SCI;
if (!tb[IFLA_LINK]) return -EINVAL; real_dev = __dev_get_by_index(link_net, nla_get_u32(tb[IFLA_LINK])); if (!real_dev) return -ENODEV; if (real_dev->type != ARPHRD_ETHER) return -EINVAL;
dev->priv_flags |= IFF_MACSEC;
macsec->real_dev = real_dev;
if (data && data[IFLA_MACSEC_OFFLOAD]) macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]); else /* MACsec offloading is off by default */ macsec->offload = MACSEC_OFFLOAD_OFF;
/* Check if the offloading mode is supported by the underlying layers */ if (macsec->offload != MACSEC_OFFLOAD_OFF && !macsec_check_offload(macsec->offload, macsec)) return -EOPNOTSUPP;
/* send_sci must be set to true when transmit sci explicitly is set */ if ((data && data[IFLA_MACSEC_SCI]) && (data && data[IFLA_MACSEC_INC_SCI])) { u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
if (!send_sci) return -EINVAL; }
if (data && data[IFLA_MACSEC_ICV_LEN]) icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); mtu = real_dev->mtu - icv_len - macsec_extra_len(true); if (mtu < 0) dev->mtu = 0; else dev->mtu = mtu;
rx_handler = rtnl_dereference(real_dev->rx_handler); if (rx_handler && rx_handler != macsec_handle_frame) return -EBUSY;
if (is_zero_ether_addr(dev->dev_addr)) eth_hw_addr_inherit(dev, real_dev);
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]));
if (sci == MACSEC_UNDEF_SCI) sci = dev_to_sci(dev, MACSEC_PORT_ES);
if (rx_handler && sci_exists(real_dev, sci)) return -EBUSY;
/* Registration can notify listeners before returning. */ macsec_init_secy(dev, sci, icv_len); if (data) { err = macsec_changelink_common(dev, data); if (err) return err; }
err = register_netdevice(dev); if (err < 0) return err;
netdev_lockdep_set_classes(dev); lockdep_set_class(&dev->addr_list_lock, &macsec_netdev_addr_lock_key);
err = netdev_upper_dev_link(real_dev, dev, extack); if (err < 0) goto unregister;
/* If h/w offloading is available, propagate to the device */ if (macsec_is_offloaded(macsec)) { const struct macsec_ops *ops; struct macsec_context ctx;
ops = macsec_get_ops(macsec, &ctx); if (ops) { ctx.secy = &macsec->secy; err = macsec_offload(ops->mdo_add_secy, &ctx); if (err) goto del_dev;
macsec->insert_tx_tag = macsec_needs_tx_tag(macsec, ops); } }
err = register_macsec_dev(real_dev, dev); if (err < 0) goto del_dev;
netdev_update_features(dev); netif_stacked_transfer_operstate(real_dev, dev); linkwatch_fire_event(dev);
macsec_generation++;
return 0;
del_dev: macsec_del_dev(macsec); netdev_upper_dev_unlink(real_dev, dev);unregister: unregister_netdevice(dev); return err;}
static int validate_cipher_suite(const struct nlattr *attr, struct netlink_ext_ack *extack){ switch (nla_get_u64(attr)) { case MACSEC_CIPHER_ID_GCM_AES_128: case MACSEC_CIPHER_ID_GCM_AES_256: case MACSEC_CIPHER_ID_GCM_AES_XPN_128: case MACSEC_CIPHER_ID_GCM_AES_XPN_256: case MACSEC_DEFAULT_CIPHER_ID: return 0; default: return -EINVAL; }}
static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[], struct netlink_ext_ack *extack){ u8 icv_len = MACSEC_DEFAULT_ICV_LEN; bool es, scb, sci;
if (!data) return 0;
if (data[IFLA_MACSEC_ICV_LEN]) { icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); if (icv_len != MACSEC_DEFAULT_ICV_LEN) { char dummy_key[DEFAULT_SAK_LEN] = { 0 }; struct crypto_aead *dummy_tfm;
dummy_tfm = macsec_alloc_tfm(dummy_key, DEFAULT_SAK_LEN, icv_len); if (IS_ERR(dummy_tfm)) return PTR_ERR(dummy_tfm); crypto_free_aead(dummy_tfm); } }
es = nla_get_u8_default(data[IFLA_MACSEC_ES], false); sci = nla_get_u8_default(data[IFLA_MACSEC_INC_SCI], false); scb = nla_get_u8_default(data[IFLA_MACSEC_SCB], false);
if ((sci && (scb || es)) || (scb && es)) return -EINVAL;
if ((data[IFLA_MACSEC_REPLAY_PROTECT] && nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && !data[IFLA_MACSEC_WINDOW]) return -EINVAL;
return 0;}
static struct net *macsec_get_link_net(const struct net_device *dev){ return dev_net(macsec_priv(dev)->real_dev);}
struct net_device *macsec_get_real_dev(const struct net_device *dev){ return macsec_priv(dev)->real_dev;}EXPORT_SYMBOL_GPL(macsec_get_real_dev);
bool macsec_netdev_is_offloaded(struct net_device *dev){ return macsec_is_offloaded(macsec_priv(dev));}EXPORT_SYMBOL_GPL(macsec_netdev_is_offloaded);
static size_t macsec_get_size(const struct net_device *dev){ return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */ nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */ nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */ nla_total_size(4) + /* IFLA_MACSEC_WINDOW */ nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */ nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */ nla_total_size(1) + /* IFLA_MACSEC_PROTECT */ nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */ nla_total_size(1) + /* IFLA_MACSEC_ES */ nla_total_size(1) + /* IFLA_MACSEC_SCB */ nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */ nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */ nla_total_size(1) + /* IFLA_MACSEC_OFFLOAD */ 0;}
static int macsec_fill_info(struct sk_buff *skb, const struct net_device *dev){ const struct macsec_tx_sc *tx_sc; const struct macsec_dev *macsec; const struct macsec_secy *secy; u64 csid;
macsec = macsec_priv(dev); secy = &macsec->secy; tx_sc = &secy->tx_sc;
switch (READ_ONCE(secy->key_len)) { case MACSEC_GCM_AES_128_SAK_LEN: csid = READ_ONCE(secy->xpn) ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID; break; case MACSEC_GCM_AES_256_SAK_LEN: csid = READ_ONCE(secy->xpn) ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256; break; default: goto nla_put_failure; }
if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, IFLA_MACSEC_PAD) || nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, csid, IFLA_MACSEC_PAD) || nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, READ_ONCE(tx_sc->encoding_sa)) || nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, READ_ONCE(tx_sc->encrypt)) || nla_put_u8(skb, IFLA_MACSEC_PROTECT, READ_ONCE(secy->protect_frames)) || nla_put_u8(skb, IFLA_MACSEC_INC_SCI, READ_ONCE(tx_sc->send_sci)) || nla_put_u8(skb, IFLA_MACSEC_ES, READ_ONCE(tx_sc->end_station)) || nla_put_u8(skb, IFLA_MACSEC_SCB, READ_ONCE(tx_sc->scb)) || nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, READ_ONCE(secy->replay_protect)) || nla_put_u8(skb, IFLA_MACSEC_VALIDATION, READ_ONCE(secy->validate_frames)) || nla_put_u8(skb, IFLA_MACSEC_OFFLOAD, READ_ONCE(macsec->offload)) || 0) goto nla_put_failure;
if (READ_ONCE(secy->replay_protect)) { if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, READ_ONCE(secy->replay_window))) goto nla_put_failure; }
return 0;
nla_put_failure: return -EMSGSIZE;}
static struct rtnl_link_ops macsec_link_ops __read_mostly = { .kind = "macsec", .priv_size = sizeof(struct macsec_dev), .maxtype = IFLA_MACSEC_MAX, .policy = macsec_rtnl_policy, .setup = macsec_setup, .validate = macsec_validate_attr, .newlink = macsec_newlink, .changelink = macsec_changelink, .dellink = macsec_dellink, .get_size = macsec_get_size, .fill_info = macsec_fill_info, .get_link_net = macsec_get_link_net,};
static bool is_macsec_master(struct net_device *dev){ return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;}
static int macsec_notify(struct notifier_block *this, unsigned long event, void *ptr){ struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); struct macsec_rxh_data *rxd; struct macsec_dev *m, *n; LIST_HEAD(head);
if (!is_macsec_master(real_dev)) return NOTIFY_DONE;
rxd = macsec_data_rtnl(real_dev);
switch (event) { case NETDEV_DOWN: case NETDEV_UP: case NETDEV_CHANGE: list_for_each_entry_safe(m, n, &rxd->secys, secys) { struct net_device *dev = m->secy.netdev;
netif_stacked_transfer_operstate(real_dev, dev); } break; case NETDEV_UNREGISTER: list_for_each_entry_safe(m, n, &rxd->secys, secys) { macsec_common_dellink(m->secy.netdev, &head); }
netdev_rx_handler_unregister(real_dev); kfree(rxd);
unregister_netdevice_many(&head); break; case NETDEV_CHANGEMTU: list_for_each_entry(m, &rxd->secys, secys) { struct net_device *dev = m->secy.netdev; unsigned int mtu = real_dev->mtu - (m->secy.icv_len + macsec_extra_len(true));
if (dev->mtu > mtu) dev_set_mtu(dev, mtu); } break; case NETDEV_FEAT_CHANGE: list_for_each_entry(m, &rxd->secys, secys) { macsec_inherit_tso_max(m->secy.netdev); netdev_update_features(m->secy.netdev); } break; }
return NOTIFY_OK;}
static struct notifier_block macsec_notifier = { .notifier_call = macsec_notify,};
static int __init macsec_init(void){ int err;
macsec_wq = alloc_workqueue("macsec", WQ_UNBOUND, 0); if (!macsec_wq) return -ENOMEM;
pr_info("MACsec IEEE 802.1AE\n"); err = register_netdevice_notifier(&macsec_notifier); if (err) goto err_destroy_wq;
err = rtnl_link_register(&macsec_link_ops); if (err) goto err_notifier;
err = genl_register_family(&macsec_fam); if (err) goto err_rtnl;
return 0;
err_rtnl: rtnl_link_unregister(&macsec_link_ops);err_notifier: unregister_netdevice_notifier(&macsec_notifier);err_destroy_wq: /* Precautionary, mirrors macsec_exit() to stay safe if work * ever becomes queueable before this point in the future. */ rcu_barrier(); destroy_workqueue(macsec_wq); 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(); destroy_workqueue(macsec_wq);}
module_init(macsec_init);module_exit(macsec_exit);
MODULE_ALIAS_RTNL_LINK("macsec");MODULE_ALIAS_GENL_FAMILY("macsec");
MODULE_DESCRIPTION("MACsec IEEE 802.1AE");MODULE_LICENSE("GPL v2");