1/*
   2 * drivers/net/macsec.c - MACsec device
   3 *
   4 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
   5 *
   6 * This program is free software; you can redistribute it and/or modify
   7 * it under the terms of the GNU General Public License as published by
   8 * the Free Software Foundation; either version 2 of the License, or
   9 * (at your option) any later version.
  10 */
  11
  12#include <linux/types.h>
  13#include <linux/skbuff.h>
  14#include <linux/socket.h>
  15#include <linux/module.h>
  16#include <crypto/aead.h>
  17#include <linux/etherdevice.h>
  18#include <linux/rtnetlink.h>
  19#include <linux/refcount.h>
  20#include <net/genetlink.h>
  21#include <net/sock.h>
  22#include <net/gro_cells.h>
  23
  24#include <uapi/linux/if_macsec.h>
  25
  26typedef u64 __bitwise sci_t;
  27
  28#define MACSEC_SCI_LEN 8
  29
  30/* SecTAG length = macsec_eth_header without the optional SCI */
  31#define MACSEC_TAG_LEN 6
  32
  33struct macsec_eth_header {
  34	struct ethhdr eth;
  35	/* SecTAG */
  36	u8  tci_an;
  37#if defined(__LITTLE_ENDIAN_BITFIELD)
  38	u8  short_length:6,
  39		  unused:2;
  40#elif defined(__BIG_ENDIAN_BITFIELD)
  41	u8        unused:2,
  42	    short_length:6;
  43#else
  44#error	"Please fix <asm/byteorder.h>"
  45#endif
  46	__be32 packet_number;
  47	u8 secure_channel_id[8]; /* optional */
  48} __packed;
  49
  50#define MACSEC_TCI_VERSION 0x80
  51#define MACSEC_TCI_ES      0x40 /* end station */
  52#define MACSEC_TCI_SC      0x20 /* SCI present */
  53#define MACSEC_TCI_SCB     0x10 /* epon */
  54#define MACSEC_TCI_E       0x08 /* encryption */
  55#define MACSEC_TCI_C       0x04 /* changed text */
  56#define MACSEC_AN_MASK     0x03 /* association number */
  57#define MACSEC_TCI_CONFID  (MACSEC_TCI_E | MACSEC_TCI_C)
  58
  59/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
  60#define MIN_NON_SHORT_LEN 48
  61
  62#define GCM_AES_IV_LEN 12
  63#define DEFAULT_ICV_LEN 16
  64
  65#define MACSEC_NUM_AN 4 /* 2 bits for the association number */
  66
  67#define for_each_rxsc(secy, sc)			\
  68	for (sc = rcu_dereference_bh(secy->rx_sc);	\
  69	     sc;				\
  70	     sc = rcu_dereference_bh(sc->next))
  71#define for_each_rxsc_rtnl(secy, sc)			\
  72	for (sc = rtnl_dereference(secy->rx_sc);	\
  73	     sc;					\
  74	     sc = rtnl_dereference(sc->next))
  75
  76struct gcm_iv {
  77	union {
  78		u8 secure_channel_id[8];
  79		sci_t sci;
  80	};
  81	__be32 pn;
  82};
  83
  84/**
  85 * struct macsec_key - SA key
  86 * @id: user-provided key identifier
  87 * @tfm: crypto struct, key storage
  88 */
  89struct macsec_key {
  90	u8 id[MACSEC_KEYID_LEN];
  91	struct crypto_aead *tfm;
  92};
  93
  94struct macsec_rx_sc_stats {
  95	__u64 InOctetsValidated;
  96	__u64 InOctetsDecrypted;
  97	__u64 InPktsUnchecked;
  98	__u64 InPktsDelayed;
  99	__u64 InPktsOK;
 100	__u64 InPktsInvalid;
 101	__u64 InPktsLate;
 102	__u64 InPktsNotValid;
 103	__u64 InPktsNotUsingSA;
 104	__u64 InPktsUnusedSA;
 105};
 106
 107struct macsec_rx_sa_stats {
 108	__u32 InPktsOK;
 109	__u32 InPktsInvalid;
 110	__u32 InPktsNotValid;
 111	__u32 InPktsNotUsingSA;
 112	__u32 InPktsUnusedSA;
 113};
 114
 115struct macsec_tx_sa_stats {
 116	__u32 OutPktsProtected;
 117	__u32 OutPktsEncrypted;
 118};
 119
 120struct macsec_tx_sc_stats {
 121	__u64 OutPktsProtected;
 122	__u64 OutPktsEncrypted;
 123	__u64 OutOctetsProtected;
 124	__u64 OutOctetsEncrypted;
 125};
 126
 127struct macsec_dev_stats {
 128	__u64 OutPktsUntagged;
 129	__u64 InPktsUntagged;
 130	__u64 OutPktsTooLong;
 131	__u64 InPktsNoTag;
 132	__u64 InPktsBadTag;
 133	__u64 InPktsUnknownSCI;
 134	__u64 InPktsNoSCI;
 135	__u64 InPktsOverrun;
 136};
 137
 138/**
 139 * struct macsec_rx_sa - receive secure association
 140 * @active:
 141 * @next_pn: packet number expected for the next packet
 142 * @lock: protects next_pn manipulations
 143 * @key: key structure
 144 * @stats: per-SA stats
 145 */
 146struct macsec_rx_sa {
 147	struct macsec_key key;
 148	spinlock_t lock;
 149	u32 next_pn;
 150	refcount_t refcnt;
 151	bool active;
 152	struct macsec_rx_sa_stats __percpu *stats;
 153	struct macsec_rx_sc *sc;
 154	struct rcu_head rcu;
 155};
 156
 157struct pcpu_rx_sc_stats {
 158	struct macsec_rx_sc_stats stats;
 159	struct u64_stats_sync syncp;
 160};
 161
 162/**
 163 * struct macsec_rx_sc - receive secure channel
 164 * @sci: secure channel identifier for this SC
 165 * @active: channel is active
 166 * @sa: array of secure associations
 167 * @stats: per-SC stats
 168 */
 169struct macsec_rx_sc {
 170	struct macsec_rx_sc __rcu *next;
 171	sci_t sci;
 172	bool active;
 173	struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
 174	struct pcpu_rx_sc_stats __percpu *stats;
 175	refcount_t refcnt;
 176	struct rcu_head rcu_head;
 177};
 178
 179/**
 180 * struct macsec_tx_sa - transmit secure association
 181 * @active:
 182 * @next_pn: packet number to use for the next packet
 183 * @lock: protects next_pn manipulations
 184 * @key: key structure
 185 * @stats: per-SA stats
 186 */
 187struct macsec_tx_sa {
 188	struct macsec_key key;
 189	spinlock_t lock;
 190	u32 next_pn;
 191	refcount_t refcnt;
 192	bool active;
 193	struct macsec_tx_sa_stats __percpu *stats;
 194	struct rcu_head rcu;
 195};
 196
 197struct pcpu_tx_sc_stats {
 198	struct macsec_tx_sc_stats stats;
 199	struct u64_stats_sync syncp;
 200};
 201
 202/**
 203 * struct macsec_tx_sc - transmit secure channel
 204 * @active:
 205 * @encoding_sa: association number of the SA currently in use
 206 * @encrypt: encrypt packets on transmit, or authenticate only
 207 * @send_sci: always include the SCI in the SecTAG
 208 * @end_station:
 209 * @scb: single copy broadcast flag
 210 * @sa: array of secure associations
 211 * @stats: stats for this TXSC
 212 */
 213struct macsec_tx_sc {
 214	bool active;
 215	u8 encoding_sa;
 216	bool encrypt;
 217	bool send_sci;
 218	bool end_station;
 219	bool scb;
 220	struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
 221	struct pcpu_tx_sc_stats __percpu *stats;
 222};
 223
 224#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
 225
 226/**
 227 * struct macsec_secy - MACsec Security Entity
 228 * @netdev: netdevice for this SecY
 229 * @n_rx_sc: number of receive secure channels configured on this SecY
 230 * @sci: secure channel identifier used for tx
 231 * @key_len: length of keys used by the cipher suite
 232 * @icv_len: length of ICV used by the cipher suite
 233 * @validate_frames: validation mode
 234 * @operational: MAC_Operational flag
 235 * @protect_frames: enable protection for this SecY
 236 * @replay_protect: enable packet number checks on receive
 237 * @replay_window: size of the replay window
 238 * @tx_sc: transmit secure channel
 239 * @rx_sc: linked list of receive secure channels
 240 */
 241struct macsec_secy {
 242	struct net_device *netdev;
 243	unsigned int n_rx_sc;
 244	sci_t sci;
 245	u16 key_len;
 246	u16 icv_len;
 247	enum macsec_validation_type validate_frames;
 248	bool operational;
 249	bool protect_frames;
 250	bool replay_protect;
 251	u32 replay_window;
 252	struct macsec_tx_sc tx_sc;
 253	struct macsec_rx_sc __rcu *rx_sc;
 254};
 255
 256struct pcpu_secy_stats {
 257	struct macsec_dev_stats stats;
 258	struct u64_stats_sync syncp;
 259};
 260
 261/**
 262 * struct macsec_dev - private data
 263 * @secy: SecY config
 264 * @real_dev: pointer to underlying netdevice
 265 * @stats: MACsec device stats
 266 * @secys: linked list of SecY's on the underlying device
 267 */
 268struct macsec_dev {
 269	struct macsec_secy secy;
 270	struct net_device *real_dev;
 271	struct pcpu_secy_stats __percpu *stats;
 272	struct list_head secys;
 273	struct gro_cells gro_cells;
 274	unsigned int nest_level;
 275};
 276
 277/**
 278 * struct macsec_rxh_data - rx_handler private argument
 279 * @secys: linked list of SecY's on this underlying device
 280 */
 281struct macsec_rxh_data {
 282	struct list_head secys;
 283};
 284
 285static struct macsec_dev *macsec_priv(const struct net_device *dev)
 286{
 287	return (struct macsec_dev *)netdev_priv(dev);
 288}
 289
 290static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
 291{
 292	return rcu_dereference_bh(dev->rx_handler_data);
 293}
 294
 295static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
 296{
 297	return rtnl_dereference(dev->rx_handler_data);
 298}
 299
 300struct macsec_cb {
 301	struct aead_request *req;
 302	union {
 303		struct macsec_tx_sa *tx_sa;
 304		struct macsec_rx_sa *rx_sa;
 305	};
 306	u8 assoc_num;
 307	bool valid;
 308	bool has_sci;
 309};
 310
 311static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
 312{
 313	struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
 314
 315	if (!sa || !sa->active)
 316		return NULL;
 317
 318	if (!refcount_inc_not_zero(&sa->refcnt))
 319		return NULL;
 320
 321	return sa;
 322}
 323
 324static void free_rx_sc_rcu(struct rcu_head *head)
 325{
 326	struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
 327
 328	free_percpu(rx_sc->stats);
 329	kfree(rx_sc);
 330}
 331
 332static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
 333{
 334	return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
 335}
 336
 337static void macsec_rxsc_put(struct macsec_rx_sc *sc)
 338{
 339	if (refcount_dec_and_test(&sc->refcnt))
 340		call_rcu(&sc->rcu_head, free_rx_sc_rcu);
 341}
 342
 343static void free_rxsa(struct rcu_head *head)
 344{
 345	struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
 346
 347	crypto_free_aead(sa->key.tfm);
 348	free_percpu(sa->stats);
 349	kfree(sa);
 350}
 351
 352static void macsec_rxsa_put(struct macsec_rx_sa *sa)
 353{
 354	if (refcount_dec_and_test(&sa->refcnt))
 355		call_rcu(&sa->rcu, free_rxsa);
 356}
 357
 358static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
 359{
 360	struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
 361
 362	if (!sa || !sa->active)
 363		return NULL;
 364
 365	if (!refcount_inc_not_zero(&sa->refcnt))
 366		return NULL;
 367
 368	return sa;
 369}
 370
 371static void free_txsa(struct rcu_head *head)
 372{
 373	struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
 374
 375	crypto_free_aead(sa->key.tfm);
 376	free_percpu(sa->stats);
 377	kfree(sa);
 378}
 379
 380static void macsec_txsa_put(struct macsec_tx_sa *sa)
 381{
 382	if (refcount_dec_and_test(&sa->refcnt))
 383		call_rcu(&sa->rcu, free_txsa);
 384}
 385
 386static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
 387{
 388	BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
 389	return (struct macsec_cb *)skb->cb;
 390}
 391
 392#define MACSEC_PORT_ES (htons(0x0001))
 393#define MACSEC_PORT_SCB (0x0000)
 394#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
 395
 396#define MACSEC_GCM_AES_128_SAK_LEN 16
 397#define MACSEC_GCM_AES_256_SAK_LEN 32
 398
 399#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
 400#define DEFAULT_SEND_SCI true
 401#define DEFAULT_ENCRYPT false
 402#define DEFAULT_ENCODING_SA 0
 403
 404static bool send_sci(const struct macsec_secy *secy)
 405{
 406	const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
 407
 408	return tx_sc->send_sci ||
 409		(secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
 410}
 411
 412static sci_t make_sci(u8 *addr, __be16 port)
 413{
 414	sci_t sci;
 415
 416	memcpy(&sci, addr, ETH_ALEN);
 417	memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
 418
 419	return sci;
 420}
 421
 422static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
 423{
 424	sci_t sci;
 425
 426	if (sci_present)
 427		memcpy(&sci, hdr->secure_channel_id,
 428		       sizeof(hdr->secure_channel_id));
 429	else
 430		sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
 431
 432	return sci;
 433}
 434
 435static unsigned int macsec_sectag_len(bool sci_present)
 436{
 437	return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
 438}
 439
 440static unsigned int macsec_hdr_len(bool sci_present)
 441{
 442	return macsec_sectag_len(sci_present) + ETH_HLEN;
 443}
 444
 445static unsigned int macsec_extra_len(bool sci_present)
 446{
 447	return macsec_sectag_len(sci_present) + sizeof(__be16);
 448}
 449
 450/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
 451static void macsec_fill_sectag(struct macsec_eth_header *h,
 452			       const struct macsec_secy *secy, u32 pn,
 453			       bool sci_present)
 454{
 455	const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
 456
 457	memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
 458	h->eth.h_proto = htons(ETH_P_MACSEC);
 459
 460	if (sci_present) {
 461		h->tci_an |= MACSEC_TCI_SC;
 462		memcpy(&h->secure_channel_id, &secy->sci,
 463		       sizeof(h->secure_channel_id));
 464	} else {
 465		if (tx_sc->end_station)
 466			h->tci_an |= MACSEC_TCI_ES;
 467		if (tx_sc->scb)
 468			h->tci_an |= MACSEC_TCI_SCB;
 469	}
 470
 471	h->packet_number = htonl(pn);
 472
 473	/* with GCM, C/E clear for !encrypt, both set for encrypt */
 474	if (tx_sc->encrypt)
 475		h->tci_an |= MACSEC_TCI_CONFID;
 476	else if (secy->icv_len != DEFAULT_ICV_LEN)
 477		h->tci_an |= MACSEC_TCI_C;
 478
 479	h->tci_an |= tx_sc->encoding_sa;
 480}
 481
 482static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
 483{
 484	if (data_len < MIN_NON_SHORT_LEN)
 485		h->short_length = data_len;
 486}
 487
 488/* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
 489static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
 490{
 491	struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
 492	int len = skb->len - 2 * ETH_ALEN;
 493	int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
 494
 495	/* a) It comprises at least 17 octets */
 496	if (skb->len <= 16)
 497		return false;
 498
 499	/* b) MACsec EtherType: already checked */
 500
 501	/* c) V bit is clear */
 502	if (h->tci_an & MACSEC_TCI_VERSION)
 503		return false;
 504
 505	/* d) ES or SCB => !SC */
 506	if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
 507	    (h->tci_an & MACSEC_TCI_SC))
 508		return false;
 509
 510	/* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
 511	if (h->unused)
 512		return false;
 513
 514	/* rx.pn != 0 (figure 10-5) */
 515	if (!h->packet_number)
 516		return false;
 517
 518	/* length check, f) g) h) i) */
 519	if (h->short_length)
 520		return len == extra_len + h->short_length;
 521	return len >= extra_len + MIN_NON_SHORT_LEN;
 522}
 523
 524#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
 525#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
 526
 527static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
 528{
 529	struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
 530
 531	gcm_iv->sci = sci;
 532	gcm_iv->pn = htonl(pn);
 533}
 534
 535static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
 536{
 537	return (struct macsec_eth_header *)skb_mac_header(skb);
 538}
 539
 540static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
 541{
 542	u32 pn;
 543
 544	spin_lock_bh(&tx_sa->lock);
 545	pn = tx_sa->next_pn;
 546
 547	tx_sa->next_pn++;
 548	if (tx_sa->next_pn == 0) {
 549		pr_debug("PN wrapped, transitioning to !oper\n");
 550		tx_sa->active = false;
 551		if (secy->protect_frames)
 552			secy->operational = false;
 553	}
 554	spin_unlock_bh(&tx_sa->lock);
 555
 556	return pn;
 557}
 558
 559static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
 560{
 561	struct macsec_dev *macsec = netdev_priv(dev);
 562
 563	skb->dev = macsec->real_dev;
 564	skb_reset_mac_header(skb);
 565	skb->protocol = eth_hdr(skb)->h_proto;
 566}
 567
 568static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
 569			    struct macsec_tx_sa *tx_sa)
 570{
 571	struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
 572
 573	u64_stats_update_begin(&txsc_stats->syncp);
 574	if (tx_sc->encrypt) {
 575		txsc_stats->stats.OutOctetsEncrypted += skb->len;
 576		txsc_stats->stats.OutPktsEncrypted++;
 577		this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
 578	} else {
 579		txsc_stats->stats.OutOctetsProtected += skb->len;
 580		txsc_stats->stats.OutPktsProtected++;
 581		this_cpu_inc(tx_sa->stats->OutPktsProtected);
 582	}
 583	u64_stats_update_end(&txsc_stats->syncp);
 584}
 585
 586static void count_tx(struct net_device *dev, int ret, int len)
 587{
 588	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
 589		struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
 590
 591		u64_stats_update_begin(&stats->syncp);
 592		stats->tx_packets++;
 593		stats->tx_bytes += len;
 594		u64_stats_update_end(&stats->syncp);
 595	}
 596}
 597
 598static void macsec_encrypt_done(struct crypto_async_request *base, int err)
 599{
 600	struct sk_buff *skb = base->data;
 601	struct net_device *dev = skb->dev;
 602	struct macsec_dev *macsec = macsec_priv(dev);
 603	struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
 604	int len, ret;
 605
 606	aead_request_free(macsec_skb_cb(skb)->req);
 607
 608	rcu_read_lock_bh();
 609	macsec_encrypt_finish(skb, dev);
 610	macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
 611	len = skb->len;
 612	ret = dev_queue_xmit(skb);
 613	count_tx(dev, ret, len);
 614	rcu_read_unlock_bh();
 615
 616	macsec_txsa_put(sa);
 617	dev_put(dev);
 618}
 619
 620static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
 621					     unsigned char **iv,
 622					     struct scatterlist **sg,
 623					     int num_frags)
 624{
 625	size_t size, iv_offset, sg_offset;
 626	struct aead_request *req;
 627	void *tmp;
 628
 629	size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
 630	iv_offset = size;
 631	size += GCM_AES_IV_LEN;
 632
 633	size = ALIGN(size, __alignof__(struct scatterlist));
 634	sg_offset = size;
 635	size += sizeof(struct scatterlist) * num_frags;
 636
 637	tmp = kmalloc(size, GFP_ATOMIC);
 638	if (!tmp)
 639		return NULL;
 640
 641	*iv = (unsigned char *)(tmp + iv_offset);
 642	*sg = (struct scatterlist *)(tmp + sg_offset);
 643	req = tmp;
 644
 645	aead_request_set_tfm(req, tfm);
 646
 647	return req;
 648}
 649
 650static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
 651				      struct net_device *dev)
 652{
 653	int ret;
 654	struct scatterlist *sg;
 655	struct sk_buff *trailer;
 656	unsigned char *iv;
 657	struct ethhdr *eth;
 658	struct macsec_eth_header *hh;
 659	size_t unprotected_len;
 660	struct aead_request *req;
 661	struct macsec_secy *secy;
 662	struct macsec_tx_sc *tx_sc;
 663	struct macsec_tx_sa *tx_sa;
 664	struct macsec_dev *macsec = macsec_priv(dev);
 665	bool sci_present;
 666	u32 pn;
 667
 668	secy = &macsec->secy;
 669	tx_sc = &secy->tx_sc;
 670
 671	/* 10.5.1 TX SA assignment */
 672	tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
 673	if (!tx_sa) {
 674		secy->operational = false;
 675		kfree_skb(skb);
 676		return ERR_PTR(-EINVAL);
 677	}
 678
 679	if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
 680		     skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
 681		struct sk_buff *nskb = skb_copy_expand(skb,
 682						       MACSEC_NEEDED_HEADROOM,
 683						       MACSEC_NEEDED_TAILROOM,
 684						       GFP_ATOMIC);
 685		if (likely(nskb)) {
 686			consume_skb(skb);
 687			skb = nskb;
 688		} else {
 689			macsec_txsa_put(tx_sa);
 690			kfree_skb(skb);
 691			return ERR_PTR(-ENOMEM);
 692		}
 693	} else {
 694		skb = skb_unshare(skb, GFP_ATOMIC);
 695		if (!skb) {
 696			macsec_txsa_put(tx_sa);
 697			return ERR_PTR(-ENOMEM);
 698		}
 699	}
 700
 701	unprotected_len = skb->len;
 702	eth = eth_hdr(skb);
 703	sci_present = send_sci(secy);
 704	hh = skb_push(skb, macsec_extra_len(sci_present));
 705	memmove(hh, eth, 2 * ETH_ALEN);
 706
 707	pn = tx_sa_update_pn(tx_sa, secy);
 708	if (pn == 0) {
 709		macsec_txsa_put(tx_sa);
 710		kfree_skb(skb);
 711		return ERR_PTR(-ENOLINK);
 712	}
 713	macsec_fill_sectag(hh, secy, pn, sci_present);
 714	macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
 715
 716	skb_put(skb, secy->icv_len);
 717
 718	if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
 719		struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
 720
 721		u64_stats_update_begin(&secy_stats->syncp);
 722		secy_stats->stats.OutPktsTooLong++;
 723		u64_stats_update_end(&secy_stats->syncp);
 724
 725		macsec_txsa_put(tx_sa);
 726		kfree_skb(skb);
 727		return ERR_PTR(-EINVAL);
 728	}
 729
 730	ret = skb_cow_data(skb, 0, &trailer);
 731	if (unlikely(ret < 0)) {
 732		macsec_txsa_put(tx_sa);
 733		kfree_skb(skb);
 734		return ERR_PTR(ret);
 735	}
 736
 737	req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
 738	if (!req) {
 739		macsec_txsa_put(tx_sa);
 740		kfree_skb(skb);
 741		return ERR_PTR(-ENOMEM);
 742	}
 743
 744	macsec_fill_iv(iv, secy->sci, pn);
 745
 746	sg_init_table(sg, ret);
 747	ret = skb_to_sgvec(skb, sg, 0, skb->len);
 748	if (unlikely(ret < 0)) {
 749		aead_request_free(req);
 750		macsec_txsa_put(tx_sa);
 751		kfree_skb(skb);
 752		return ERR_PTR(ret);
 753	}
 754
 755	if (tx_sc->encrypt) {
 756		int len = skb->len - macsec_hdr_len(sci_present) -
 757			  secy->icv_len;
 758		aead_request_set_crypt(req, sg, sg, len, iv);
 759		aead_request_set_ad(req, macsec_hdr_len(sci_present));
 760	} else {
 761		aead_request_set_crypt(req, sg, sg, 0, iv);
 762		aead_request_set_ad(req, skb->len - secy->icv_len);
 763	}
 764
 765	macsec_skb_cb(skb)->req = req;
 766	macsec_skb_cb(skb)->tx_sa = tx_sa;
 767	aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
 768
 769	dev_hold(skb->dev);
 770	ret = crypto_aead_encrypt(req);
 771	if (ret == -EINPROGRESS) {
 772		return ERR_PTR(ret);
 773	} else if (ret != 0) {
 774		dev_put(skb->dev);
 775		kfree_skb(skb);
 776		aead_request_free(req);
 777		macsec_txsa_put(tx_sa);
 778		return ERR_PTR(-EINVAL);
 779	}
 780
 781	dev_put(skb->dev);
 782	aead_request_free(req);
 783	macsec_txsa_put(tx_sa);
 784
 785	return skb;
 786}
 787
 788static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
 789{
 790	struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
 791	struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
 792	struct macsec_eth_header *hdr = macsec_ethhdr(skb);
 793	u32 lowest_pn = 0;
 794
 795	spin_lock(&rx_sa->lock);
 796	if (rx_sa->next_pn >= secy->replay_window)
 797		lowest_pn = rx_sa->next_pn - secy->replay_window;
 798
 799	/* Now perform replay protection check again
 800	 * (see IEEE 802.1AE-2006 figure 10-5)
 801	 */
 802	if (secy->replay_protect && pn < lowest_pn) {
 803		spin_unlock(&rx_sa->lock);
 804		u64_stats_update_begin(&rxsc_stats->syncp);
 805		rxsc_stats->stats.InPktsLate++;
 806		u64_stats_update_end(&rxsc_stats->syncp);
 807		return false;
 808	}
 809
 810	if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
 811		u64_stats_update_begin(&rxsc_stats->syncp);
 812		if (hdr->tci_an & MACSEC_TCI_E)
 813			rxsc_stats->stats.InOctetsDecrypted += skb->len;
 814		else
 815			rxsc_stats->stats.InOctetsValidated += skb->len;
 816		u64_stats_update_end(&rxsc_stats->syncp);
 817	}
 818
 819	if (!macsec_skb_cb(skb)->valid) {
 820		spin_unlock(&rx_sa->lock);
 821
 822		/* 10.6.5 */
 823		if (hdr->tci_an & MACSEC_TCI_C ||
 824		    secy->validate_frames == MACSEC_VALIDATE_STRICT) {
 825			u64_stats_update_begin(&rxsc_stats->syncp);
 826			rxsc_stats->stats.InPktsNotValid++;
 827			u64_stats_update_end(&rxsc_stats->syncp);
 828			return false;
 829		}
 830
 831		u64_stats_update_begin(&rxsc_stats->syncp);
 832		if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
 833			rxsc_stats->stats.InPktsInvalid++;
 834			this_cpu_inc(rx_sa->stats->InPktsInvalid);
 835		} else if (pn < lowest_pn) {
 836			rxsc_stats->stats.InPktsDelayed++;
 837		} else {
 838			rxsc_stats->stats.InPktsUnchecked++;
 839		}
 840		u64_stats_update_end(&rxsc_stats->syncp);
 841	} else {
 842		u64_stats_update_begin(&rxsc_stats->syncp);
 843		if (pn < lowest_pn) {
 844			rxsc_stats->stats.InPktsDelayed++;
 845		} else {
 846			rxsc_stats->stats.InPktsOK++;
 847			this_cpu_inc(rx_sa->stats->InPktsOK);
 848		}
 849		u64_stats_update_end(&rxsc_stats->syncp);
 850
 851		if (pn >= rx_sa->next_pn)
 852			rx_sa->next_pn = pn + 1;
 853		spin_unlock(&rx_sa->lock);
 854	}
 855
 856	return true;
 857}
 858
 859static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
 860{
 861	skb->pkt_type = PACKET_HOST;
 862	skb->protocol = eth_type_trans(skb, dev);
 863
 864	skb_reset_network_header(skb);
 865	if (!skb_transport_header_was_set(skb))
 866		skb_reset_transport_header(skb);
 867	skb_reset_mac_len(skb);
 868}
 869
 870static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
 871{
 872	memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
 873	skb_pull(skb, hdr_len);
 874	pskb_trim_unique(skb, skb->len - icv_len);
 875}
 876
 877static void count_rx(struct net_device *dev, int len)
 878{
 879	struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
 880
 881	u64_stats_update_begin(&stats->syncp);
 882	stats->rx_packets++;
 883	stats->rx_bytes += len;
 884	u64_stats_update_end(&stats->syncp);
 885}
 886
 887static void macsec_decrypt_done(struct crypto_async_request *base, int err)
 888{
 889	struct sk_buff *skb = base->data;
 890	struct net_device *dev = skb->dev;
 891	struct macsec_dev *macsec = macsec_priv(dev);
 892	struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
 893	struct macsec_rx_sc *rx_sc = rx_sa->sc;
 894	int len;
 895	u32 pn;
 896
 897	aead_request_free(macsec_skb_cb(skb)->req);
 898
 899	if (!err)
 900		macsec_skb_cb(skb)->valid = true;
 901
 902	rcu_read_lock_bh();
 903	pn = ntohl(macsec_ethhdr(skb)->packet_number);
 904	if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
 905		rcu_read_unlock_bh();
 906		kfree_skb(skb);
 907		goto out;
 908	}
 909
 910	macsec_finalize_skb(skb, macsec->secy.icv_len,
 911			    macsec_extra_len(macsec_skb_cb(skb)->has_sci));
 912	macsec_reset_skb(skb, macsec->secy.netdev);
 913
 914	len = skb->len;
 915	if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
 916		count_rx(dev, len);
 917
 918	rcu_read_unlock_bh();
 919
 920out:
 921	macsec_rxsa_put(rx_sa);
 922	macsec_rxsc_put(rx_sc);
 923	dev_put(dev);
 924}
 925
 926static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
 927				      struct net_device *dev,
 928				      struct macsec_rx_sa *rx_sa,
 929				      sci_t sci,
 930				      struct macsec_secy *secy)
 931{
 932	int ret;
 933	struct scatterlist *sg;
 934	struct sk_buff *trailer;
 935	unsigned char *iv;
 936	struct aead_request *req;
 937	struct macsec_eth_header *hdr;
 938	u16 icv_len = secy->icv_len;
 939
 940	macsec_skb_cb(skb)->valid = false;
 941	skb = skb_share_check(skb, GFP_ATOMIC);
 942	if (!skb)
 943		return ERR_PTR(-ENOMEM);
 944
 945	ret = skb_cow_data(skb, 0, &trailer);
 946	if (unlikely(ret < 0)) {
 947		kfree_skb(skb);
 948		return ERR_PTR(ret);
 949	}
 950	req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
 951	if (!req) {
 952		kfree_skb(skb);
 953		return ERR_PTR(-ENOMEM);
 954	}
 955
 956	hdr = (struct macsec_eth_header *)skb->data;
 957	macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
 958
 959	sg_init_table(sg, ret);
 960	ret = skb_to_sgvec(skb, sg, 0, skb->len);
 961	if (unlikely(ret < 0)) {
 962		aead_request_free(req);
 963		kfree_skb(skb);
 964		return ERR_PTR(ret);
 965	}
 966
 967	if (hdr->tci_an & MACSEC_TCI_E) {
 968		/* confidentiality: ethernet + macsec header
 969		 * authenticated, encrypted payload
 970		 */
 971		int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
 972
 973		aead_request_set_crypt(req, sg, sg, len, iv);
 974		aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
 975		skb = skb_unshare(skb, GFP_ATOMIC);
 976		if (!skb) {
 977			aead_request_free(req);
 978			return ERR_PTR(-ENOMEM);
 979		}
 980	} else {
 981		/* integrity only: all headers + data authenticated */
 982		aead_request_set_crypt(req, sg, sg, icv_len, iv);
 983		aead_request_set_ad(req, skb->len - icv_len);
 984	}
 985
 986	macsec_skb_cb(skb)->req = req;
 987	skb->dev = dev;
 988	aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
 989
 990	dev_hold(dev);
 991	ret = crypto_aead_decrypt(req);
 992	if (ret == -EINPROGRESS) {
 993		return ERR_PTR(ret);
 994	} else if (ret != 0) {
 995		/* decryption/authentication failed
 996		 * 10.6 if validateFrames is disabled, deliver anyway
 997		 */
 998		if (ret != -EBADMSG) {
 999			kfree_skb(skb);
1000			skb = ERR_PTR(ret);
1001		}
1002	} else {
1003		macsec_skb_cb(skb)->valid = true;
1004	}
1005	dev_put(dev);
1006
1007	aead_request_free(req);
1008
1009	return skb;
1010}
1011
1012static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
1013{
1014	struct macsec_rx_sc *rx_sc;
1015
1016	for_each_rxsc(secy, rx_sc) {
1017		if (rx_sc->sci == sci)
1018			return rx_sc;
1019	}
1020
1021	return NULL;
1022}
1023
1024static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
1025{
1026	struct macsec_rx_sc *rx_sc;
1027
1028	for_each_rxsc_rtnl(secy, rx_sc) {
1029		if (rx_sc->sci == sci)
1030			return rx_sc;
1031	}
1032
1033	return NULL;
1034}
1035
1036static void handle_not_macsec(struct sk_buff *skb)
1037{
1038	struct macsec_rxh_data *rxd;
1039	struct macsec_dev *macsec;
1040
1041	rcu_read_lock();
1042	rxd = macsec_data_rcu(skb->dev);
1043
1044	/* 10.6 If the management control validateFrames is not
1045	 * Strict, frames without a SecTAG are received, counted, and
1046	 * delivered to the Controlled Port
1047	 */
1048	list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1049		struct sk_buff *nskb;
1050		struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1051
1052		if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1053			u64_stats_update_begin(&secy_stats->syncp);
1054			secy_stats->stats.InPktsNoTag++;
1055			u64_stats_update_end(&secy_stats->syncp);
1056			continue;
1057		}
1058
1059		/* deliver on this port */
1060		nskb = skb_clone(skb, GFP_ATOMIC);
1061		if (!nskb)
1062			break;
1063
1064		nskb->dev = macsec->secy.netdev;
1065
1066		if (netif_rx(nskb) == NET_RX_SUCCESS) {
1067			u64_stats_update_begin(&secy_stats->syncp);
1068			secy_stats->stats.InPktsUntagged++;
1069			u64_stats_update_end(&secy_stats->syncp);
1070		}
1071	}
1072
1073	rcu_read_unlock();
1074}
1075
1076static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1077{
1078	struct sk_buff *skb = *pskb;
1079	struct net_device *dev = skb->dev;
1080	struct macsec_eth_header *hdr;
1081	struct macsec_secy *secy = NULL;
1082	struct macsec_rx_sc *rx_sc;
1083	struct macsec_rx_sa *rx_sa;
1084	struct macsec_rxh_data *rxd;
1085	struct macsec_dev *macsec;
1086	sci_t sci;
1087	u32 pn;
1088	bool cbit;
1089	struct pcpu_rx_sc_stats *rxsc_stats;
1090	struct pcpu_secy_stats *secy_stats;
1091	bool pulled_sci;
1092	int ret;
1093
1094	if (skb_headroom(skb) < ETH_HLEN)
1095		goto drop_direct;
1096
1097	hdr = macsec_ethhdr(skb);
1098	if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1099		handle_not_macsec(skb);
1100
1101		/* and deliver to the uncontrolled port */
1102		return RX_HANDLER_PASS;
1103	}
1104
1105	skb = skb_unshare(skb, GFP_ATOMIC);
1106	if (!skb) {
1107		*pskb = NULL;
1108		return RX_HANDLER_CONSUMED;
1109	}
1110
1111	pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1112	if (!pulled_sci) {
1113		if (!pskb_may_pull(skb, macsec_extra_len(false)))
1114			goto drop_direct;
1115	}
1116
1117	hdr = macsec_ethhdr(skb);
1118
1119	/* Frames with a SecTAG that has the TCI E bit set but the C
1120	 * bit clear are discarded, as this reserved encoding is used
1121	 * to identify frames with a SecTAG that are not to be
1122	 * delivered to the Controlled Port.
1123	 */
1124	if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1125		return RX_HANDLER_PASS;
1126
1127	/* now, pull the extra length */
1128	if (hdr->tci_an & MACSEC_TCI_SC) {
1129		if (!pulled_sci)
1130			goto drop_direct;
1131	}
1132
1133	/* ethernet header is part of crypto processing */
1134	skb_push(skb, ETH_HLEN);
1135
1136	macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1137	macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1138	sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1139
1140	rcu_read_lock();
1141	rxd = macsec_data_rcu(skb->dev);
1142
1143	list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1144		struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1145		sc = sc ? macsec_rxsc_get(sc) : NULL;
1146
1147		if (sc) {
1148			secy = &macsec->secy;
1149			rx_sc = sc;
1150			break;
1151		}
1152	}
1153
1154	if (!secy)
1155		goto nosci;
1156
1157	dev = secy->netdev;
1158	macsec = macsec_priv(dev);
1159	secy_stats = this_cpu_ptr(macsec->stats);
1160	rxsc_stats = this_cpu_ptr(rx_sc->stats);
1161
1162	if (!macsec_validate_skb(skb, secy->icv_len)) {
1163		u64_stats_update_begin(&secy_stats->syncp);
1164		secy_stats->stats.InPktsBadTag++;
1165		u64_stats_update_end(&secy_stats->syncp);
1166		goto drop_nosa;
1167	}
1168
1169	rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1170	if (!rx_sa) {
1171		/* 10.6.1 if the SA is not in use */
1172
1173		/* If validateFrames is Strict or the C bit in the
1174		 * SecTAG is set, discard
1175		 */
1176		if (hdr->tci_an & MACSEC_TCI_C ||
1177		    secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1178			u64_stats_update_begin(&rxsc_stats->syncp);
1179			rxsc_stats->stats.InPktsNotUsingSA++;
1180			u64_stats_update_end(&rxsc_stats->syncp);
1181			goto drop_nosa;
1182		}
1183
1184		/* not Strict, the frame (with the SecTAG and ICV
1185		 * removed) is delivered to the Controlled Port.
1186		 */
1187		u64_stats_update_begin(&rxsc_stats->syncp);
1188		rxsc_stats->stats.InPktsUnusedSA++;
1189		u64_stats_update_end(&rxsc_stats->syncp);
1190		goto deliver;
1191	}
1192
1193	/* First, PN check to avoid decrypting obviously wrong packets */
1194	pn = ntohl(hdr->packet_number);
1195	if (secy->replay_protect) {
1196		bool late;
1197
1198		spin_lock(&rx_sa->lock);
1199		late = rx_sa->next_pn >= secy->replay_window &&
1200		       pn < (rx_sa->next_pn - secy->replay_window);
1201		spin_unlock(&rx_sa->lock);
1202
1203		if (late) {
1204			u64_stats_update_begin(&rxsc_stats->syncp);
1205			rxsc_stats->stats.InPktsLate++;
1206			u64_stats_update_end(&rxsc_stats->syncp);
1207			goto drop;
1208		}
1209	}
1210
1211	macsec_skb_cb(skb)->rx_sa = rx_sa;
1212
1213	/* Disabled && !changed text => skip validation */
1214	if (hdr->tci_an & MACSEC_TCI_C ||
1215	    secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1216		skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1217
1218	if (IS_ERR(skb)) {
1219		/* the decrypt callback needs the reference */
1220		if (PTR_ERR(skb) != -EINPROGRESS) {
1221			macsec_rxsa_put(rx_sa);
1222			macsec_rxsc_put(rx_sc);
1223		}
1224		rcu_read_unlock();
1225		*pskb = NULL;
1226		return RX_HANDLER_CONSUMED;
1227	}
1228
1229	if (!macsec_post_decrypt(skb, secy, pn))
1230		goto drop;
1231
1232deliver:
1233	macsec_finalize_skb(skb, secy->icv_len,
1234			    macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1235	macsec_reset_skb(skb, secy->netdev);
1236
1237	if (rx_sa)
1238		macsec_rxsa_put(rx_sa);
1239	macsec_rxsc_put(rx_sc);
1240
1241	ret = gro_cells_receive(&macsec->gro_cells, skb);
1242	if (ret == NET_RX_SUCCESS)
1243		count_rx(dev, skb->len);
1244	else
1245		macsec->secy.netdev->stats.rx_dropped++;
1246
1247	rcu_read_unlock();
1248
1249	*pskb = NULL;
1250	return RX_HANDLER_CONSUMED;
1251
1252drop:
1253	macsec_rxsa_put(rx_sa);
1254drop_nosa:
1255	macsec_rxsc_put(rx_sc);
1256	rcu_read_unlock();
1257drop_direct:
1258	kfree_skb(skb);
1259	*pskb = NULL;
1260	return RX_HANDLER_CONSUMED;
1261
1262nosci:
1263	/* 10.6.1 if the SC is not found */
1264	cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1265	if (!cbit)
1266		macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1267				    macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1268
1269	list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1270		struct sk_buff *nskb;
1271
1272		secy_stats = this_cpu_ptr(macsec->stats);
1273
1274		/* If validateFrames is Strict or the C bit in the
1275		 * SecTAG is set, discard
1276		 */
1277		if (cbit ||
1278		    macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1279			u64_stats_update_begin(&secy_stats->syncp);
1280			secy_stats->stats.InPktsNoSCI++;
1281			u64_stats_update_end(&secy_stats->syncp);
1282			continue;
1283		}
1284
1285		/* not strict, the frame (with the SecTAG and ICV
1286		 * removed) is delivered to the Controlled Port.
1287		 */
1288		nskb = skb_clone(skb, GFP_ATOMIC);
1289		if (!nskb)
1290			break;
1291
1292		macsec_reset_skb(nskb, macsec->secy.netdev);
1293
1294		ret = netif_rx(nskb);
1295		if (ret == NET_RX_SUCCESS) {
1296			u64_stats_update_begin(&secy_stats->syncp);
1297			secy_stats->stats.InPktsUnknownSCI++;
1298			u64_stats_update_end(&secy_stats->syncp);
1299		} else {
1300			macsec->secy.netdev->stats.rx_dropped++;
1301		}
1302	}
1303
1304	rcu_read_unlock();
1305	*pskb = skb;
1306	return RX_HANDLER_PASS;
1307}
1308
1309static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1310{
1311	struct crypto_aead *tfm;
1312	int ret;
1313
1314	tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1315
1316	if (IS_ERR(tfm))
1317		return tfm;
1318
1319	ret = crypto_aead_setkey(tfm, key, key_len);
1320	if (ret < 0)
1321		goto fail;
1322
1323	ret = crypto_aead_setauthsize(tfm, icv_len);
1324	if (ret < 0)
1325		goto fail;
1326
1327	return tfm;
1328fail:
1329	crypto_free_aead(tfm);
1330	return ERR_PTR(ret);
1331}
1332
1333static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1334		      int icv_len)
1335{
1336	rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1337	if (!rx_sa->stats)
1338		return -ENOMEM;
1339
1340	rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1341	if (IS_ERR(rx_sa->key.tfm)) {
1342		free_percpu(rx_sa->stats);
1343		return PTR_ERR(rx_sa->key.tfm);
1344	}
1345
1346	rx_sa->active = false;
1347	rx_sa->next_pn = 1;
1348	refcount_set(&rx_sa->refcnt, 1);
1349	spin_lock_init(&rx_sa->lock);
1350
1351	return 0;
1352}
1353
1354static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1355{
1356	rx_sa->active = false;
1357
1358	macsec_rxsa_put(rx_sa);
1359}
1360
1361static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1362{
1363	int i;
1364
1365	for (i = 0; i < MACSEC_NUM_AN; i++) {
1366		struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1367
1368		RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1369		if (sa)
1370			clear_rx_sa(sa);
1371	}
1372
1373	macsec_rxsc_put(rx_sc);
1374}
1375
1376static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1377{
1378	struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1379
1380	for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1381	     rx_sc;
1382	     rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1383		if (rx_sc->sci == sci) {
1384			if (rx_sc->active)
1385				secy->n_rx_sc--;
1386			rcu_assign_pointer(*rx_scp, rx_sc->next);
1387			return rx_sc;
1388		}
1389	}
1390
1391	return NULL;
1392}
1393
1394static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1395{
1396	struct macsec_rx_sc *rx_sc;
1397	struct macsec_dev *macsec;
1398	struct net_device *real_dev = macsec_priv(dev)->real_dev;
1399	struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1400	struct macsec_secy *secy;
1401
1402	list_for_each_entry(macsec, &rxd->secys, secys) {
1403		if (find_rx_sc_rtnl(&macsec->secy, sci))
1404			return ERR_PTR(-EEXIST);
1405	}
1406
1407	rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1408	if (!rx_sc)
1409		return ERR_PTR(-ENOMEM);
1410
1411	rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1412	if (!rx_sc->stats) {
1413		kfree(rx_sc);
1414		return ERR_PTR(-ENOMEM);
1415	}
1416
1417	rx_sc->sci = sci;
1418	rx_sc->active = true;
1419	refcount_set(&rx_sc->refcnt, 1);
1420
1421	secy = &macsec_priv(dev)->secy;
1422	rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1423	rcu_assign_pointer(secy->rx_sc, rx_sc);
1424
1425	if (rx_sc->active)
1426		secy->n_rx_sc++;
1427
1428	return rx_sc;
1429}
1430
1431static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1432		      int icv_len)
1433{
1434	tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1435	if (!tx_sa->stats)
1436		return -ENOMEM;
1437
1438	tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1439	if (IS_ERR(tx_sa->key.tfm)) {
1440		free_percpu(tx_sa->stats);
1441		return PTR_ERR(tx_sa->key.tfm);
1442	}
1443
1444	tx_sa->active = false;
1445	refcount_set(&tx_sa->refcnt, 1);
1446	spin_lock_init(&tx_sa->lock);
1447
1448	return 0;
1449}
1450
1451static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1452{
1453	tx_sa->active = false;
1454
1455	macsec_txsa_put(tx_sa);
1456}
1457
1458static struct genl_family macsec_fam;
1459
1460static struct net_device *get_dev_from_nl(struct net *net,
1461					  struct nlattr **attrs)
1462{
1463	int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1464	struct net_device *dev;
1465
1466	dev = __dev_get_by_index(net, ifindex);
1467	if (!dev)
1468		return ERR_PTR(-ENODEV);
1469
1470	if (!netif_is_macsec(dev))
1471		return ERR_PTR(-ENODEV);
1472
1473	return dev;
1474}
1475
1476static sci_t nla_get_sci(const struct nlattr *nla)
1477{
1478	return (__force sci_t)nla_get_u64(nla);
1479}
1480
1481static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1482		       int padattr)
1483{
1484	return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1485}
1486
1487static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1488					     struct nlattr **attrs,
1489					     struct nlattr **tb_sa,
1490					     struct net_device **devp,
1491					     struct macsec_secy **secyp,
1492					     struct macsec_tx_sc **scp,
1493					     u8 *assoc_num)
1494{
1495	struct net_device *dev;
1496	struct macsec_secy *secy;
1497	struct macsec_tx_sc *tx_sc;
1498	struct macsec_tx_sa *tx_sa;
1499
1500	if (!tb_sa[MACSEC_SA_ATTR_AN])
1501		return ERR_PTR(-EINVAL);
1502
1503	*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1504
1505	dev = get_dev_from_nl(net, attrs);
1506	if (IS_ERR(dev))
1507		return ERR_CAST(dev);
1508
1509	if (*assoc_num >= MACSEC_NUM_AN)
1510		return ERR_PTR(-EINVAL);
1511
1512	secy = &macsec_priv(dev)->secy;
1513	tx_sc = &secy->tx_sc;
1514
1515	tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1516	if (!tx_sa)
1517		return ERR_PTR(-ENODEV);
1518
1519	*devp = dev;
1520	*scp = tx_sc;
1521	*secyp = secy;
1522	return tx_sa;
1523}
1524
1525static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1526					     struct nlattr **attrs,
1527					     struct nlattr **tb_rxsc,
1528					     struct net_device **devp,
1529					     struct macsec_secy **secyp)
1530{
1531	struct net_device *dev;
1532	struct macsec_secy *secy;
1533	struct macsec_rx_sc *rx_sc;
1534	sci_t sci;
1535
1536	dev = get_dev_from_nl(net, attrs);
1537	if (IS_ERR(dev))
1538		return ERR_CAST(dev);
1539
1540	secy = &macsec_priv(dev)->secy;
1541
1542	if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1543		return ERR_PTR(-EINVAL);
1544
1545	sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1546	rx_sc = find_rx_sc_rtnl(secy, sci);
1547	if (!rx_sc)
1548		return ERR_PTR(-ENODEV);
1549
1550	*secyp = secy;
1551	*devp = dev;
1552
1553	return rx_sc;
1554}
1555
1556static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1557					     struct nlattr **attrs,
1558					     struct nlattr **tb_rxsc,
1559					     struct nlattr **tb_sa,
1560					     struct net_device **devp,
1561					     struct macsec_secy **secyp,
1562					     struct macsec_rx_sc **scp,
1563					     u8 *assoc_num)
1564{
1565	struct macsec_rx_sc *rx_sc;
1566	struct macsec_rx_sa *rx_sa;
1567
1568	if (!tb_sa[MACSEC_SA_ATTR_AN])
1569		return ERR_PTR(-EINVAL);
1570
1571	*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1572	if (*assoc_num >= MACSEC_NUM_AN)
1573		return ERR_PTR(-EINVAL);
1574
1575	rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1576	if (IS_ERR(rx_sc))
1577		return ERR_CAST(rx_sc);
1578
1579	rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1580	if (!rx_sa)
1581		return ERR_PTR(-ENODEV);
1582
1583	*scp = rx_sc;
1584	return rx_sa;
1585}
1586
1587
1588static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1589	[MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1590	[MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1591	[MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1592};
1593
1594static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1595	[MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1596	[MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1597};
1598
1599static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1600	[MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1601	[MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1602	[MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1603	[MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1604				   .len = MACSEC_KEYID_LEN, },
1605	[MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1606				 .len = MACSEC_MAX_KEY_LEN, },
1607};
1608
1609static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1610{
1611	if (!attrs[MACSEC_ATTR_SA_CONFIG])
1612		return -EINVAL;
1613
1614	if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX,
1615			     attrs[MACSEC_ATTR_SA_CONFIG],
1616			     macsec_genl_sa_policy, NULL))
1617		return -EINVAL;
1618
1619	return 0;
1620}
1621
1622static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1623{
1624	if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1625		return -EINVAL;
1626
1627	if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX,
1628			     attrs[MACSEC_ATTR_RXSC_CONFIG],
1629			     macsec_genl_rxsc_policy, NULL))
1630		return -EINVAL;
1631
1632	return 0;
1633}
1634
1635static bool validate_add_rxsa(struct nlattr **attrs)
1636{
1637	if (!attrs[MACSEC_SA_ATTR_AN] ||
1638	    !attrs[MACSEC_SA_ATTR_KEY] ||
1639	    !attrs[MACSEC_SA_ATTR_KEYID])
1640		return false;
1641
1642	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1643		return false;
1644
1645	if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1646		return false;
1647
1648	if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1649		if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1650			return false;
1651	}
1652
1653	if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1654		return false;
1655
1656	return true;
1657}
1658
1659static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1660{
1661	struct net_device *dev;
1662	struct nlattr **attrs = info->attrs;
1663	struct macsec_secy *secy;
1664	struct macsec_rx_sc *rx_sc;
1665	struct macsec_rx_sa *rx_sa;
1666	unsigned char assoc_num;
1667	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1668	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1669	int err;
1670
1671	if (!attrs[MACSEC_ATTR_IFINDEX])
1672		return -EINVAL;
1673
1674	if (parse_sa_config(attrs, tb_sa))
1675		return -EINVAL;
1676
1677	if (parse_rxsc_config(attrs, tb_rxsc))
1678		return -EINVAL;
1679
1680	if (!validate_add_rxsa(tb_sa))
1681		return -EINVAL;
1682
1683	rtnl_lock();
1684	rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1685	if (IS_ERR(rx_sc)) {
1686		rtnl_unlock();
1687		return PTR_ERR(rx_sc);
1688	}
1689
1690	assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1691
1692	if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1693		pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1694			  nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1695		rtnl_unlock();
1696		return -EINVAL;
1697	}
1698
1699	rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1700	if (rx_sa) {
1701		rtnl_unlock();
1702		return -EBUSY;
1703	}
1704
1705	rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1706	if (!rx_sa) {
1707		rtnl_unlock();
1708		return -ENOMEM;
1709	}
1710
1711	err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1712			 secy->key_len, secy->icv_len);
1713	if (err < 0) {
1714		kfree(rx_sa);
1715		rtnl_unlock();
1716		return err;
1717	}
1718
1719	if (tb_sa[MACSEC_SA_ATTR_PN]) {
1720		spin_lock_bh(&rx_sa->lock);
1721		rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1722		spin_unlock_bh(&rx_sa->lock);
1723	}
1724
1725	if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1726		rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1727
1728	nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1729	rx_sa->sc = rx_sc;
1730	rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1731
1732	rtnl_unlock();
1733
1734	return 0;
1735}
1736
1737static bool validate_add_rxsc(struct nlattr **attrs)
1738{
1739	if (!attrs[MACSEC_RXSC_ATTR_SCI])
1740		return false;
1741
1742	if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1743		if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1744			return false;
1745	}
1746
1747	return true;
1748}
1749
1750static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1751{
1752	struct net_device *dev;
1753	sci_t sci = MACSEC_UNDEF_SCI;
1754	struct nlattr **attrs = info->attrs;
1755	struct macsec_rx_sc *rx_sc;
1756	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1757
1758	if (!attrs[MACSEC_ATTR_IFINDEX])
1759		return -EINVAL;
1760
1761	if (parse_rxsc_config(attrs, tb_rxsc))
1762		return -EINVAL;
1763
1764	if (!validate_add_rxsc(tb_rxsc))
1765		return -EINVAL;
1766
1767	rtnl_lock();
1768	dev = get_dev_from_nl(genl_info_net(info), attrs);
1769	if (IS_ERR(dev)) {
1770		rtnl_unlock();
1771		return PTR_ERR(dev);
1772	}
1773
1774	sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1775
1776	rx_sc = create_rx_sc(dev, sci);
1777	if (IS_ERR(rx_sc)) {
1778		rtnl_unlock();
1779		return PTR_ERR(rx_sc);
1780	}
1781
1782	if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1783		rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1784
1785	rtnl_unlock();
1786
1787	return 0;
1788}
1789
1790static bool validate_add_txsa(struct nlattr **attrs)
1791{
1792	if (!attrs[MACSEC_SA_ATTR_AN] ||
1793	    !attrs[MACSEC_SA_ATTR_PN] ||
1794	    !attrs[MACSEC_SA_ATTR_KEY] ||
1795	    !attrs[MACSEC_SA_ATTR_KEYID])
1796		return false;
1797
1798	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1799		return false;
1800
1801	if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1802		return false;
1803
1804	if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1805		if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1806			return false;
1807	}
1808
1809	if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1810		return false;
1811
1812	return true;
1813}
1814
1815static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1816{
1817	struct net_device *dev;
1818	struct nlattr **attrs = info->attrs;
1819	struct macsec_secy *secy;
1820	struct macsec_tx_sc *tx_sc;
1821	struct macsec_tx_sa *tx_sa;
1822	unsigned char assoc_num;
1823	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1824	int err;
1825
1826	if (!attrs[MACSEC_ATTR_IFINDEX])
1827		return -EINVAL;
1828
1829	if (parse_sa_config(attrs, tb_sa))
1830		return -EINVAL;
1831
1832	if (!validate_add_txsa(tb_sa))
1833		return -EINVAL;
1834
1835	rtnl_lock();
1836	dev = get_dev_from_nl(genl_info_net(info), attrs);
1837	if (IS_ERR(dev)) {
1838		rtnl_unlock();
1839		return PTR_ERR(dev);
1840	}
1841
1842	secy = &macsec_priv(dev)->secy;
1843	tx_sc = &secy->tx_sc;
1844
1845	assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1846
1847	if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1848		pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1849			  nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1850		rtnl_unlock();
1851		return -EINVAL;
1852	}
1853
1854	tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1855	if (tx_sa) {
1856		rtnl_unlock();
1857		return -EBUSY;
1858	}
1859
1860	tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1861	if (!tx_sa) {
1862		rtnl_unlock();
1863		return -ENOMEM;
1864	}
1865
1866	err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1867			 secy->key_len, secy->icv_len);
1868	if (err < 0) {
1869		kfree(tx_sa);
1870		rtnl_unlock();
1871		return err;
1872	}
1873
1874	nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1875
1876	spin_lock_bh(&tx_sa->lock);
1877	tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1878	spin_unlock_bh(&tx_sa->lock);
1879
1880	if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1881		tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1882
1883	if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1884		secy->operational = true;
1885
1886	rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1887
1888	rtnl_unlock();
1889
1890	return 0;
1891}
1892
1893static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1894{
1895	struct nlattr **attrs = info->attrs;
1896	struct net_device *dev;
1897	struct macsec_secy *secy;
1898	struct macsec_rx_sc *rx_sc;
1899	struct macsec_rx_sa *rx_sa;
1900	u8 assoc_num;
1901	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1902	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1903
1904	if (!attrs[MACSEC_ATTR_IFINDEX])
1905		return -EINVAL;
1906
1907	if (parse_sa_config(attrs, tb_sa))
1908		return -EINVAL;
1909
1910	if (parse_rxsc_config(attrs, tb_rxsc))
1911		return -EINVAL;
1912
1913	rtnl_lock();
1914	rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1915				 &dev, &secy, &rx_sc, &assoc_num);
1916	if (IS_ERR(rx_sa)) {
1917		rtnl_unlock();
1918		return PTR_ERR(rx_sa);
1919	}
1920
1921	if (rx_sa->active) {
1922		rtnl_unlock();
1923		return -EBUSY;
1924	}
1925
1926	RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1927	clear_rx_sa(rx_sa);
1928
1929	rtnl_unlock();
1930
1931	return 0;
1932}
1933
1934static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1935{
1936	struct nlattr **attrs = info->attrs;
1937	struct net_device *dev;
1938	struct macsec_secy *secy;
1939	struct macsec_rx_sc *rx_sc;
1940	sci_t sci;
1941	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1942
1943	if (!attrs[MACSEC_ATTR_IFINDEX])
1944		return -EINVAL;
1945
1946	if (parse_rxsc_config(attrs, tb_rxsc))
1947		return -EINVAL;
1948
1949	if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1950		return -EINVAL;
1951
1952	rtnl_lock();
1953	dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1954	if (IS_ERR(dev)) {
1955		rtnl_unlock();
1956		return PTR_ERR(dev);
1957	}
1958
1959	secy = &macsec_priv(dev)->secy;
1960	sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1961
1962	rx_sc = del_rx_sc(secy, sci);
1963	if (!rx_sc) {
1964		rtnl_unlock();
1965		return -ENODEV;
1966	}
1967
1968	free_rx_sc(rx_sc);
1969	rtnl_unlock();
1970
1971	return 0;
1972}
1973
1974static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1975{
1976	struct nlattr **attrs = info->attrs;
1977	struct net_device *dev;
1978	struct macsec_secy *secy;
1979	struct macsec_tx_sc *tx_sc;
1980	struct macsec_tx_sa *tx_sa;
1981	u8 assoc_num;
1982	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1983
1984	if (!attrs[MACSEC_ATTR_IFINDEX])
1985		return -EINVAL;
1986
1987	if (parse_sa_config(attrs, tb_sa))
1988		return -EINVAL;
1989
1990	rtnl_lock();
1991	tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1992				 &dev, &secy, &tx_sc, &assoc_num);
1993	if (IS_ERR(tx_sa)) {
1994		rtnl_unlock();
1995		return PTR_ERR(tx_sa);
1996	}
1997
1998	if (tx_sa->active) {
1999		rtnl_unlock();
2000		return -EBUSY;
2001	}
2002
2003	RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2004	clear_tx_sa(tx_sa);
2005
2006	rtnl_unlock();
2007
2008	return 0;
2009}
2010
2011static bool validate_upd_sa(struct nlattr **attrs)
2012{
2013	if (!attrs[MACSEC_SA_ATTR_AN] ||
2014	    attrs[MACSEC_SA_ATTR_KEY] ||
2015	    attrs[MACSEC_SA_ATTR_KEYID])
2016		return false;
2017
2018	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2019		return false;
2020
2021	if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2022		return false;
2023
2024	if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2025		if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2026			return false;
2027	}
2028
2029	return true;
2030}
2031
2032static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2033{
2034	struct nlattr **attrs = info->attrs;
2035	struct net_device *dev;
2036	struct macsec_secy *secy;
2037	struct macsec_tx_sc *tx_sc;
2038	struct macsec_tx_sa *tx_sa;
2039	u8 assoc_num;
2040	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2041
2042	if (!attrs[MACSEC_ATTR_IFINDEX])
2043		return -EINVAL;
2044
2045	if (parse_sa_config(attrs, tb_sa))
2046		return -EINVAL;
2047
2048	if (!validate_upd_sa(tb_sa))
2049		return -EINVAL;
2050
2051	rtnl_lock();
2052	tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2053				 &dev, &secy, &tx_sc, &assoc_num);
2054	if (IS_ERR(tx_sa)) {
2055		rtnl_unlock();
2056		return PTR_ERR(tx_sa);
2057	}
2058
2059	if (tb_sa[MACSEC_SA_ATTR_PN]) {
2060		spin_lock_bh(&tx_sa->lock);
2061		tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2062		spin_unlock_bh(&tx_sa->lock);
2063	}
2064
2065	if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2066		tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2067
2068	if (assoc_num == tx_sc->encoding_sa)
2069		secy->operational = tx_sa->active;
2070
2071	rtnl_unlock();
2072
2073	return 0;
2074}
2075
2076static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2077{
2078	struct nlattr **attrs = info->attrs;
2079	struct net_device *dev;
2080	struct macsec_secy *secy;
2081	struct macsec_rx_sc *rx_sc;
2082	struct macsec_rx_sa *rx_sa;
2083	u8 assoc_num;
2084	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2085	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2086
2087	if (!attrs[MACSEC_ATTR_IFINDEX])
2088		return -EINVAL;
2089
2090	if (parse_rxsc_config(attrs, tb_rxsc))
2091		return -EINVAL;
2092
2093	if (parse_sa_config(attrs, tb_sa))
2094		return -EINVAL;
2095
2096	if (!validate_upd_sa(tb_sa))
2097		return -EINVAL;
2098
2099	rtnl_lock();
2100	rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2101				 &dev, &secy, &rx_sc, &assoc_num);
2102	if (IS_ERR(rx_sa)) {
2103		rtnl_unlock();
2104		return PTR_ERR(rx_sa);
2105	}
2106
2107	if (tb_sa[MACSEC_SA_ATTR_PN]) {
2108		spin_lock_bh(&rx_sa->lock);
2109		rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2110		spin_unlock_bh(&rx_sa->lock);
2111	}
2112
2113	if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2114		rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2115
2116	rtnl_unlock();
2117	return 0;
2118}
2119
2120static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2121{
2122	struct nlattr **attrs = info->attrs;
2123	struct net_device *dev;
2124	struct macsec_secy *secy;
2125	struct macsec_rx_sc *rx_sc;
2126	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2127
2128	if (!attrs[MACSEC_ATTR_IFINDEX])
2129		return -EINVAL;
2130
2131	if (parse_rxsc_config(attrs, tb_rxsc))
2132		return -EINVAL;
2133
2134	if (!validate_add_rxsc(tb_rxsc))
2135		return -EINVAL;
2136
2137	rtnl_lock();
2138	rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2139	if (IS_ERR(rx_sc)) {
2140		rtnl_unlock();
2141		return PTR_ERR(rx_sc);
2142	}
2143
2144	if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2145		bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2146
2147		if (rx_sc->active != new)
2148			secy->n_rx_sc += new ? 1 : -1;
2149
2150		rx_sc->active = new;
2151	}
2152
2153	rtnl_unlock();
2154
2155	return 0;
2156}
2157
2158static int copy_tx_sa_stats(struct sk_buff *skb,
2159			     struct macsec_tx_sa_stats __percpu *pstats)
2160{
2161	struct macsec_tx_sa_stats sum = {0, };
2162	int cpu;
2163
2164	for_each_possible_cpu(cpu) {
2165		const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2166
2167		sum.OutPktsProtected += stats->OutPktsProtected;
2168		sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2169	}
2170
2171	if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2172	    nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2173		return -EMSGSIZE;
2174
2175	return 0;
2176}
2177
2178static int copy_rx_sa_stats(struct sk_buff *skb,
2179			     struct macsec_rx_sa_stats __percpu *pstats)
2180{
2181	struct macsec_rx_sa_stats sum = {0, };
2182	int cpu;
2183
2184	for_each_possible_cpu(cpu) {
2185		const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2186
2187		sum.InPktsOK         += stats->InPktsOK;
2188		sum.InPktsInvalid    += stats->InPktsInvalid;
2189		sum.InPktsNotValid   += stats->InPktsNotValid;
2190		sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2191		sum.InPktsUnusedSA   += stats->InPktsUnusedSA;
2192	}
2193
2194	if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2195	    nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2196	    nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2197	    nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2198	    nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2199		return -EMSGSIZE;
2200
2201	return 0;
2202}
2203
2204static int copy_rx_sc_stats(struct sk_buff *skb,
2205			     struct pcpu_rx_sc_stats __percpu *pstats)
2206{
2207	struct macsec_rx_sc_stats sum = {0, };
2208	int cpu;
2209
2210	for_each_possible_cpu(cpu) {
2211		const struct pcpu_rx_sc_stats *stats;
2212		struct macsec_rx_sc_stats tmp;
2213		unsigned int start;
2214
2215		stats = per_cpu_ptr(pstats, cpu);
2216		do {
2217			start = u64_stats_fetch_begin_irq(&stats->syncp);
2218			memcpy(&tmp, &stats->stats, sizeof(tmp));
2219		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2220
2221		sum.InOctetsValidated += tmp.InOctetsValidated;
2222		sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2223		sum.InPktsUnchecked   += tmp.InPktsUnchecked;
2224		sum.InPktsDelayed     += tmp.InPktsDelayed;
2225		sum.InPktsOK          += tmp.InPktsOK;
2226		sum.InPktsInvalid     += tmp.InPktsInvalid;
2227		sum.InPktsLate        += tmp.InPktsLate;
2228		sum.InPktsNotValid    += tmp.InPktsNotValid;
2229		sum.InPktsNotUsingSA  += tmp.InPktsNotUsingSA;
2230		sum.InPktsUnusedSA    += tmp.InPktsUnusedSA;
2231	}
2232
2233	if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2234			      sum.InOctetsValidated,
2235			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2236	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2237			      sum.InOctetsDecrypted,
2238			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2239	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2240			      sum.InPktsUnchecked,
2241			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2242	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2243			      sum.InPktsDelayed,
2244			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2245	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2246			      sum.InPktsOK,
2247			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2248	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2249			      sum.InPktsInvalid,
2250			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2251	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2252			      sum.InPktsLate,
2253			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2254	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2255			      sum.InPktsNotValid,
2256			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2257	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2258			      sum.InPktsNotUsingSA,
2259			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2260	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2261			      sum.InPktsUnusedSA,
2262			      MACSEC_RXSC_STATS_ATTR_PAD))
2263		return -EMSGSIZE;
2264
2265	return 0;
2266}
2267
2268static int copy_tx_sc_stats(struct sk_buff *skb,
2269			     struct pcpu_tx_sc_stats __percpu *pstats)
2270{
2271	struct macsec_tx_sc_stats sum = {0, };
2272	int cpu;
2273
2274	for_each_possible_cpu(cpu) {
2275		const struct pcpu_tx_sc_stats *stats;
2276		struct macsec_tx_sc_stats tmp;
2277		unsigned int start;
2278
2279		stats = per_cpu_ptr(pstats, cpu);
2280		do {
2281			start = u64_stats_fetch_begin_irq(&stats->syncp);
2282			memcpy(&tmp, &stats->stats, sizeof(tmp));
2283		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2284
2285		sum.OutPktsProtected   += tmp.OutPktsProtected;
2286		sum.OutPktsEncrypted   += tmp.OutPktsEncrypted;
2287		sum.OutOctetsProtected += tmp.OutOctetsProtected;
2288		sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2289	}
2290
2291	if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2292			      sum.OutPktsProtected,
2293			      MACSEC_TXSC_STATS_ATTR_PAD) ||
2294	    nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2295			      sum.OutPktsEncrypted,
2296			      MACSEC_TXSC_STATS_ATTR_PAD) ||
2297	    nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2298			      sum.OutOctetsProtected,
2299			      MACSEC_TXSC_STATS_ATTR_PAD) ||
2300	    nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2301			      sum.OutOctetsEncrypted,
2302			      MACSEC_TXSC_STATS_ATTR_PAD))
2303		return -EMSGSIZE;
2304
2305	return 0;
2306}
2307
2308static int copy_secy_stats(struct sk_buff *skb,
2309			    struct pcpu_secy_stats __percpu *pstats)
2310{
2311	struct macsec_dev_stats sum = {0, };
2312	int cpu;
2313
2314	for_each_possible_cpu(cpu) {
2315		const struct pcpu_secy_stats *stats;
2316		struct macsec_dev_stats tmp;
2317		unsigned int start;
2318
2319		stats = per_cpu_ptr(pstats, cpu);
2320		do {
2321			start = u64_stats_fetch_begin_irq(&stats->syncp);
2322			memcpy(&tmp, &stats->stats, sizeof(tmp));
2323		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2324
2325		sum.OutPktsUntagged  += tmp.OutPktsUntagged;
2326		sum.InPktsUntagged   += tmp.InPktsUntagged;
2327		sum.OutPktsTooLong   += tmp.OutPktsTooLong;
2328		sum.InPktsNoTag      += tmp.InPktsNoTag;
2329		sum.InPktsBadTag     += tmp.InPktsBadTag;
2330		sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2331		sum.InPktsNoSCI      += tmp.InPktsNoSCI;
2332		sum.InPktsOverrun    += tmp.InPktsOverrun;
2333	}
2334
2335	if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2336			      sum.OutPktsUntagged,
2337			      MACSEC_SECY_STATS_ATTR_PAD) ||
2338	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2339			      sum.InPktsUntagged,
2340			      MACSEC_SECY_STATS_ATTR_PAD) ||
2341	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2342			      sum.OutPktsTooLong,
2343			      MACSEC_SECY_STATS_ATTR_PAD) ||
2344	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2345			      sum.InPktsNoTag,
2346			      MACSEC_SECY_STATS_ATTR_PAD) ||
2347	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2348			      sum.InPktsBadTag,
2349			      MACSEC_SECY_STATS_ATTR_PAD) ||
2350	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2351			      sum.InPktsUnknownSCI,
2352			      MACSEC_SECY_STATS_ATTR_PAD) ||
2353	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2354			      sum.InPktsNoSCI,
2355			      MACSEC_SECY_STATS_ATTR_PAD) ||
2356	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2357			      sum.InPktsOverrun,
2358			      MACSEC_SECY_STATS_ATTR_PAD))
2359		return -EMSGSIZE;
2360
2361	return 0;
2362}
2363
2364static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2365{
2366	struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2367	struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2368	u64 csid;
2369
2370	if (!secy_nest)
2371		return 1;
2372
2373	switch (secy->key_len) {
2374	case MACSEC_GCM_AES_128_SAK_LEN:
2375		csid = MACSEC_DEFAULT_CIPHER_ID;
2376		break;
2377	case MACSEC_GCM_AES_256_SAK_LEN:
2378		csid = MACSEC_CIPHER_ID_GCM_AES_256;
2379		break;
2380	default:
2381		goto cancel;
2382	}
2383
2384	if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2385			MACSEC_SECY_ATTR_PAD) ||
2386	    nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2387			      csid, MACSEC_SECY_ATTR_PAD) ||
2388	    nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2389	    nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2390	    nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2391	    nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2392	    nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2393	    nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2394	    nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2395	    nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2396	    nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2397	    nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2398		goto cancel;
2399
2400	if (secy->replay_protect) {
2401		if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2402			goto cancel;
2403	}
2404
2405	nla_nest_end(skb, secy_nest);
2406	return 0;
2407
2408cancel:
2409	nla_nest_cancel(skb, secy_nest);
2410	return 1;
2411}
2412
2413static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2414		     struct sk_buff *skb, struct netlink_callback *cb)
2415{
2416	struct macsec_rx_sc *rx_sc;
2417	struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2418	struct nlattr *txsa_list, *rxsc_list;
2419	int i, j;
2420	void *hdr;
2421	struct nlattr *attr;
2422
2423	hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2424			  &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2425	if (!hdr)
2426		return -EMSGSIZE;
2427
2428	genl_dump_check_consistent(cb, hdr);
2429
2430	if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2431		goto nla_put_failure;
2432
2433	if (nla_put_secy(secy, skb))
2434		goto nla_put_failure;
2435
2436	attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2437	if (!attr)
2438		goto nla_put_failure;
2439	if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2440		nla_nest_cancel(skb, attr);
2441		goto nla_put_failure;
2442	}
2443	nla_nest_end(skb, attr);
2444
2445	attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2446	if (!attr)
2447		goto nla_put_failure;
2448	if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2449		nla_nest_cancel(skb, attr);
2450		goto nla_put_failure;
2451	}
2452	nla_nest_end(skb, attr);
2453
2454	txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2455	if (!txsa_list)
2456		goto nla_put_failure;
2457	for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2458		struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2459		struct nlattr *txsa_nest;
2460
2461		if (!tx_sa)
2462			continue;
2463
2464		txsa_nest = nla_nest_start(skb, j++);
2465		if (!txsa_nest) {
2466			nla_nest_cancel(skb, txsa_list);
2467			goto nla_put_failure;
2468		}
2469
2470		if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2471		    nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2472		    nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2473		    nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2474			nla_nest_cancel(skb, txsa_nest);
2475			nla_nest_cancel(skb, txsa_list);
2476			goto nla_put_failure;
2477		}
2478
2479		attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2480		if (!attr) {
2481			nla_nest_cancel(skb, txsa_nest);
2482			nla_nest_cancel(skb, txsa_list);
2483			goto nla_put_failure;
2484		}
2485		if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2486			nla_nest_cancel(skb, attr);
2487			nla_nest_cancel(skb, txsa_nest);
2488			nla_nest_cancel(skb, txsa_list);
2489			goto nla_put_failure;
2490		}
2491		nla_nest_end(skb, attr);
2492
2493		nla_nest_end(skb, txsa_nest);
2494	}
2495	nla_nest_end(skb, txsa_list);
2496
2497	rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2498	if (!rxsc_list)
2499		goto nla_put_failure;
2500
2501	j = 1;
2502	for_each_rxsc_rtnl(secy, rx_sc) {
2503		int k;
2504		struct nlattr *rxsa_list;
2505		struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2506
2507		if (!rxsc_nest) {
2508			nla_nest_cancel(skb, rxsc_list);
2509			goto nla_put_failure;
2510		}
2511
2512		if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2513		    nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2514				MACSEC_RXSC_ATTR_PAD)) {
2515			nla_nest_cancel(skb, rxsc_nest);
2516			nla_nest_cancel(skb, rxsc_list);
2517			goto nla_put_failure;
2518		}
2519
2520		attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2521		if (!attr) {
2522			nla_nest_cancel(skb, rxsc_nest);
2523			nla_nest_cancel(skb, rxsc_list);
2524			goto nla_put_failure;
2525		}
2526		if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2527			nla_nest_cancel(skb, attr);
2528			nla_nest_cancel(skb, rxsc_nest);
2529			nla_nest_cancel(skb, rxsc_list);
2530			goto nla_put_failure;
2531		}
2532		nla_nest_end(skb, attr);
2533
2534		rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2535		if (!rxsa_list) {
2536			nla_nest_cancel(skb, rxsc_nest);
2537			nla_nest_cancel(skb, rxsc_list);
2538			goto nla_put_failure;
2539		}
2540
2541		for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2542			struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2543			struct nlattr *rxsa_nest;
2544
2545			if (!rx_sa)
2546				continue;
2547
2548			rxsa_nest = nla_nest_start(skb, k++);
2549			if (!rxsa_nest) {
2550				nla_nest_cancel(skb, rxsa_list);
2551				nla_nest_cancel(skb, rxsc_nest);
2552				nla_nest_cancel(skb, rxsc_list);
2553				goto nla_put_failure;
2554			}
2555
2556			attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2557			if (!attr) {
2558				nla_nest_cancel(skb, rxsa_list);
2559				nla_nest_cancel(skb, rxsc_nest);
2560				nla_nest_cancel(skb, rxsc_list);
2561				goto nla_put_failure;
2562			}
2563			if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2564				nla_nest_cancel(skb, attr);
2565				nla_nest_cancel(skb, rxsa_list);
2566				nla_nest_cancel(skb, rxsc_nest);
2567				nla_nest_cancel(skb, rxsc_list);
2568				goto nla_put_failure;
2569			}
2570			nla_nest_end(skb, attr);
2571
2572			if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2573			    nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2574			    nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2575			    nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2576				nla_nest_cancel(skb, rxsa_nest);
2577				nla_nest_cancel(skb, rxsc_nest);
2578				nla_nest_cancel(skb, rxsc_list);
2579				goto nla_put_failure;
2580			}
2581			nla_nest_end(skb, rxsa_nest);
2582		}
2583
2584		nla_nest_end(skb, rxsa_list);
2585		nla_nest_end(skb, rxsc_nest);
2586	}
2587
2588	nla_nest_end(skb, rxsc_list);
2589
2590	genlmsg_end(skb, hdr);
2591
2592	return 0;
2593
2594nla_put_failure:
2595	genlmsg_cancel(skb, hdr);
2596	return -EMSGSIZE;
2597}
2598
2599static int macsec_generation = 1; /* protected by RTNL */
2600
2601static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2602{
2603	struct net *net = sock_net(skb->sk);
2604	struct net_device *dev;
2605	int dev_idx, d;
2606
2607	dev_idx = cb->args[0];
2608
2609	d = 0;
2610	rtnl_lock();
2611
2612	cb->seq = macsec_generation;
2613
2614	for_each_netdev(net, dev) {
2615		struct macsec_secy *secy;
2616
2617		if (d < dev_idx)
2618			goto next;
2619
2620		if (!netif_is_macsec(dev))
2621			goto next;
2622
2623		secy = &macsec_priv(dev)->secy;
2624		if (dump_secy(secy, dev, skb, cb) < 0)
2625			goto done;
2626next:
2627		d++;
2628	}
2629
2630done:
2631	rtnl_unlock();
2632	cb->args[0] = d;
2633	return skb->len;
2634}
2635
2636static const struct genl_ops macsec_genl_ops[] = {
2637	{
2638		.cmd = MACSEC_CMD_GET_TXSC,
2639		.dumpit = macsec_dump_txsc,
2640		.policy = macsec_genl_policy,
2641	},
2642	{
2643		.cmd = MACSEC_CMD_ADD_RXSC,
2644		.doit = macsec_add_rxsc,
2645		.policy = macsec_genl_policy,
2646		.flags = GENL_ADMIN_PERM,
2647	},
2648	{
2649		.cmd = MACSEC_CMD_DEL_RXSC,
2650		.doit = macsec_del_rxsc,
2651		.policy = macsec_genl_policy,
2652		.flags = GENL_ADMIN_PERM,
2653	},
2654	{
2655		.cmd = MACSEC_CMD_UPD_RXSC,
2656		.doit = macsec_upd_rxsc,
2657		.policy = macsec_genl_policy,
2658		.flags = GENL_ADMIN_PERM,
2659	},
2660	{
2661		.cmd = MACSEC_CMD_ADD_TXSA,
2662		.doit = macsec_add_txsa,
2663		.policy = macsec_genl_policy,
2664		.flags = GENL_ADMIN_PERM,
2665	},
2666	{
2667		.cmd = MACSEC_CMD_DEL_TXSA,
2668		.doit = macsec_del_txsa,
2669		.policy = macsec_genl_policy,
2670		.flags = GENL_ADMIN_PERM,
2671	},
2672	{
2673		.cmd = MACSEC_CMD_UPD_TXSA,
2674		.doit = macsec_upd_txsa,
2675		.policy = macsec_genl_policy,
2676		.flags = GENL_ADMIN_PERM,
2677	},
2678	{
2679		.cmd = MACSEC_CMD_ADD_RXSA,
2680		.doit = macsec_add_rxsa,
2681		.policy = macsec_genl_policy,
2682		.flags = GENL_ADMIN_PERM,
2683	},
2684	{
2685		.cmd = MACSEC_CMD_DEL_RXSA,
2686		.doit = macsec_del_rxsa,
2687		.policy = macsec_genl_policy,
2688		.flags = GENL_ADMIN_PERM,
2689	},
2690	{
2691		.cmd = MACSEC_CMD_UPD_RXSA,
2692		.doit = macsec_upd_rxsa,
2693		.policy = macsec_genl_policy,
2694		.flags = GENL_ADMIN_PERM,
2695	},
2696};
2697
2698static struct genl_family macsec_fam __ro_after_init = {
2699	.name		= MACSEC_GENL_NAME,
2700	.hdrsize	= 0,
2701	.version	= MACSEC_GENL_VERSION,
2702	.maxattr	= MACSEC_ATTR_MAX,
2703	.netnsok	= true,
2704	.module		= THIS_MODULE,
2705	.ops		= macsec_genl_ops,
2706	.n_ops		= ARRAY_SIZE(macsec_genl_ops),
2707};
2708
2709static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2710				     struct net_device *dev)
2711{
2712	struct macsec_dev *macsec = netdev_priv(dev);
2713	struct macsec_secy *secy = &macsec->secy;
2714	struct pcpu_secy_stats *secy_stats;
2715	int ret, len;
2716
2717	/* 10.5 */
2718	if (!secy->protect_frames) {
2719		secy_stats = this_cpu_ptr(macsec->stats);
2720		u64_stats_update_begin(&secy_stats->syncp);
2721		secy_stats->stats.OutPktsUntagged++;
2722		u64_stats_update_end(&secy_stats->syncp);
2723		skb->dev = macsec->real_dev;
2724		len = skb->len;
2725		ret = dev_queue_xmit(skb);
2726		count_tx(dev, ret, len);
2727		return ret;
2728	}
2729
2730	if (!secy->operational) {
2731		kfree_skb(skb);
2732		dev->stats.tx_dropped++;
2733		return NETDEV_TX_OK;
2734	}
2735
2736	skb = macsec_encrypt(skb, dev);
2737	if (IS_ERR(skb)) {
2738		if (PTR_ERR(skb) != -EINPROGRESS)
2739			dev->stats.tx_dropped++;
2740		return NETDEV_TX_OK;
2741	}
2742
2743	macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2744
2745	macsec_encrypt_finish(skb, dev);
2746	len = skb->len;
2747	ret = dev_queue_xmit(skb);
2748	count_tx(dev, ret, len);
2749	return ret;
2750}
2751
2752#define MACSEC_FEATURES \
2753	(NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2754static struct lock_class_key macsec_netdev_addr_lock_key;
2755
2756static int macsec_dev_init(struct net_device *dev)
2757{
2758	struct macsec_dev *macsec = macsec_priv(dev);
2759	struct net_device *real_dev = macsec->real_dev;
2760	int err;
2761
2762	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2763	if (!dev->tstats)
2764		return -ENOMEM;
2765
2766	err = gro_cells_init(&macsec->gro_cells, dev);
2767	if (err) {
2768		free_percpu(dev->tstats);
2769		return err;
2770	}
2771
2772	dev->features = real_dev->features & MACSEC_FEATURES;
2773	dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2774
2775	dev->needed_headroom = real_dev->needed_headroom +
2776			       MACSEC_NEEDED_HEADROOM;
2777	dev->needed_tailroom = real_dev->needed_tailroom +
2778			       MACSEC_NEEDED_TAILROOM;
2779
2780	if (is_zero_ether_addr(dev->dev_addr))
2781		eth_hw_addr_inherit(dev, real_dev);
2782	if (is_zero_ether_addr(dev->broadcast))
2783		memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2784
2785	return 0;
2786}
2787
2788static void macsec_dev_uninit(struct net_device *dev)
2789{
2790	struct macsec_dev *macsec = macsec_priv(dev);
2791
2792	gro_cells_destroy(&macsec->gro_cells);
2793	free_percpu(dev->tstats);
2794}
2795
2796static netdev_features_t macsec_fix_features(struct net_device *dev,
2797					     netdev_features_t features)
2798{
2799	struct macsec_dev *macsec = macsec_priv(dev);
2800	struct net_device *real_dev = macsec->real_dev;
2801
2802	features &= (real_dev->features & MACSEC_FEATURES) |
2803		    NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2804	features |= NETIF_F_LLTX;
2805
2806	return features;
2807}
2808
2809static int macsec_dev_open(struct net_device *dev)
2810{
2811	struct macsec_dev *macsec = macsec_priv(dev);
2812	struct net_device *real_dev = macsec->real_dev;
2813	int err;
2814
2815	if (!(real_dev->flags & IFF_UP))
2816		return -ENETDOWN;
2817
2818	err = dev_uc_add(real_dev, dev->dev_addr);
2819	if (err < 0)
2820		return err;
2821
2822	if (dev->flags & IFF_ALLMULTI) {
2823		err = dev_set_allmulti(real_dev, 1);
2824		if (err < 0)
2825			goto del_unicast;
2826	}
2827
2828	if (dev->flags & IFF_PROMISC) {
2829		err = dev_set_promiscuity(real_dev, 1);
2830		if (err < 0)
2831			goto clear_allmulti;
2832	}
2833
2834	if (netif_carrier_ok(real_dev))
2835		netif_carrier_on(dev);
2836
2837	return 0;
2838clear_allmulti:
2839	if (dev->flags & IFF_ALLMULTI)
2840		dev_set_allmulti(real_dev, -1);
2841del_unicast:
2842	dev_uc_del(real_dev, dev->dev_addr);
2843	netif_carrier_off(dev);
2844	return err;
2845}
2846
2847static int macsec_dev_stop(struct net_device *dev)
2848{
2849	struct macsec_dev *macsec = macsec_priv(dev);
2850	struct net_device *real_dev = macsec->real_dev;
2851
2852	netif_carrier_off(dev);
2853
2854	dev_mc_unsync(real_dev, dev);
2855	dev_uc_unsync(real_dev, dev);
2856
2857	if (dev->flags & IFF_ALLMULTI)
2858		dev_set_allmulti(real_dev, -1);
2859
2860	if (dev->flags & IFF_PROMISC)
2861		dev_set_promiscuity(real_dev, -1);
2862
2863	dev_uc_del(real_dev, dev->dev_addr);
2864
2865	return 0;
2866}
2867
2868static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2869{
2870	struct net_device *real_dev = macsec_priv(dev)->real_dev;
2871
2872	if (!(dev->flags & IFF_UP))
2873		return;
2874
2875	if (change & IFF_ALLMULTI)
2876		dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2877
2878	if (change & IFF_PROMISC)
2879		dev_set_promiscuity(real_dev,
2880				    dev->flags & IFF_PROMISC ? 1 : -1);
2881}
2882
2883static void macsec_dev_set_rx_mode(struct net_device *dev)
2884{
2885	struct net_device *real_dev = macsec_priv(dev)->real_dev;
2886
2887	dev_mc_sync(real_dev, dev);
2888	dev_uc_sync(real_dev, dev);
2889}
2890
2891static int macsec_set_mac_address(struct net_device *dev, void *p)
2892{
2893	struct macsec_dev *macsec = macsec_priv(dev);
2894	struct net_device *real_dev = macsec->real_dev;
2895	struct sockaddr *addr = p;
2896	int err;
2897
2898	if (!is_valid_ether_addr(addr->sa_data))
2899		return -EADDRNOTAVAIL;
2900
2901	if (!(dev->flags & IFF_UP))
2902		goto out;
2903
2904	err = dev_uc_add(real_dev, addr->sa_data);
2905	if (err < 0)
2906		return err;
2907
2908	dev_uc_del(real_dev, dev->dev_addr);
2909
2910out:
2911	ether_addr_copy(dev->dev_addr, addr->sa_data);
2912	return 0;
2913}
2914
2915static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2916{
2917	struct macsec_dev *macsec = macsec_priv(dev);
2918	unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2919
2920	if (macsec->real_dev->mtu - extra < new_mtu)
2921		return -ERANGE;
2922
2923	dev->mtu = new_mtu;
2924
2925	return 0;
2926}
2927
2928static void macsec_get_stats64(struct net_device *dev,
2929			       struct rtnl_link_stats64 *s)
2930{
2931	int cpu;
2932
2933	if (!dev->tstats)
2934		return;
2935
2936	for_each_possible_cpu(cpu) {
2937		struct pcpu_sw_netstats *stats;
2938		struct pcpu_sw_netstats tmp;
2939		int start;
2940
2941		stats = per_cpu_ptr(dev->tstats, cpu);
2942		do {
2943			start = u64_stats_fetch_begin_irq(&stats->syncp);
2944			tmp.rx_packets = stats->rx_packets;
2945			tmp.rx_bytes   = stats->rx_bytes;
2946			tmp.tx_packets = stats->tx_packets;
2947			tmp.tx_bytes   = stats->tx_bytes;
2948		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2949
2950		s->rx_packets += tmp.rx_packets;
2951		s->rx_bytes   += tmp.rx_bytes;
2952		s->tx_packets += tmp.tx_packets;
2953		s->tx_bytes   += tmp.tx_bytes;
2954	}
2955
2956	s->rx_dropped = dev->stats.rx_dropped;
2957	s->tx_dropped = dev->stats.tx_dropped;
2958}
2959
2960static int macsec_get_iflink(const struct net_device *dev)
2961{
2962	return macsec_priv(dev)->real_dev->ifindex;
2963}
2964
2965
2966static int macsec_get_nest_level(struct net_device *dev)
2967{
2968	return macsec_priv(dev)->nest_level;
2969}
2970
2971
2972static const struct net_device_ops macsec_netdev_ops = {
2973	.ndo_init		= macsec_dev_init,
2974	.ndo_uninit		= macsec_dev_uninit,
2975	.ndo_open		= macsec_dev_open,
2976	.ndo_stop		= macsec_dev_stop,
2977	.ndo_fix_features	= macsec_fix_features,
2978	.ndo_change_mtu		= macsec_change_mtu,
2979	.ndo_set_rx_mode	= macsec_dev_set_rx_mode,
2980	.ndo_change_rx_flags	= macsec_dev_change_rx_flags,
2981	.ndo_set_mac_address	= macsec_set_mac_address,
2982	.ndo_start_xmit		= macsec_start_xmit,
2983	.ndo_get_stats64	= macsec_get_stats64,
2984	.ndo_get_iflink		= macsec_get_iflink,
2985	.ndo_get_lock_subclass  = macsec_get_nest_level,
2986};
2987
2988static const struct device_type macsec_type = {
2989	.name = "macsec",
2990};
2991
2992static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2993	[IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2994	[IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2995	[IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2996	[IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2997	[IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2998	[IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2999	[IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3000	[IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3001	[IFLA_MACSEC_ES] = { .type = NLA_U8 },
3002	[IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3003	[IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3004	[IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3005};
3006
3007static void macsec_free_netdev(struct net_device *dev)
3008{
3009	struct macsec_dev *macsec = macsec_priv(dev);
3010	struct net_device *real_dev = macsec->real_dev;
3011
3012	free_percpu(macsec->stats);
3013	free_percpu(macsec->secy.tx_sc.stats);
3014
3015	dev_put(real_dev);
3016}
3017
3018static void macsec_setup(struct net_device *dev)
3019{
3020	ether_setup(dev);
3021	dev->min_mtu = 0;
3022	dev->max_mtu = ETH_MAX_MTU;
3023	dev->priv_flags |= IFF_NO_QUEUE;
3024	dev->netdev_ops = &macsec_netdev_ops;
3025	dev->needs_free_netdev = true;
3026	dev->priv_destructor = macsec_free_netdev;
3027	SET_NETDEV_DEVTYPE(dev, &macsec_type);
3028
3029	eth_zero_addr(dev->broadcast);
3030}
3031
3032static int macsec_changelink_common(struct net_device *dev,
3033				    struct nlattr *data[])
3034{
3035	struct macsec_secy *secy;
3036	struct macsec_tx_sc *tx_sc;
3037
3038	secy = &macsec_priv(dev)->secy;
3039	tx_sc = &secy->tx_sc;
3040
3041	if (data[IFLA_MACSEC_ENCODING_SA]) {
3042		struct macsec_tx_sa *tx_sa;
3043
3044		tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3045		tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3046
3047		secy->operational = tx_sa && tx_sa->active;
3048	}
3049
3050	if (data[IFLA_MACSEC_WINDOW])
3051		secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3052
3053	if (data[IFLA_MACSEC_ENCRYPT])
3054		tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3055
3056	if (data[IFLA_MACSEC_PROTECT])
3057		secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3058
3059	if (data[IFLA_MACSEC_INC_SCI])
3060		tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3061
3062	if (data[IFLA_MACSEC_ES])
3063		tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3064
3065	if (data[IFLA_MACSEC_SCB])
3066		tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3067
3068	if (data[IFLA_MACSEC_REPLAY_PROTECT])
3069		secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3070
3071	if (data[IFLA_MACSEC_VALIDATION])
3072		secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3073
3074	if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3075		switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3076		case MACSEC_CIPHER_ID_GCM_AES_128:
3077		case MACSEC_DEFAULT_CIPHER_ID:
3078			secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3079			break;
3080		case MACSEC_CIPHER_ID_GCM_AES_256:
3081			secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3082			break;
3083		default:
3084			return -EINVAL;
3085		}
3086	}
3087
3088	return 0;
3089}
3090
3091static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3092			     struct nlattr *data[],
3093			     struct netlink_ext_ack *extack)
3094{
3095	if (!data)
3096		return 0;
3097
3098	if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3099	    data[IFLA_MACSEC_ICV_LEN] ||
3100	    data[IFLA_MACSEC_SCI] ||
3101	    data[IFLA_MACSEC_PORT])
3102		return -EINVAL;
3103
3104	return macsec_changelink_common(dev, data);
3105}
3106
3107static void macsec_del_dev(struct macsec_dev *macsec)
3108{
3109	int i;
3110
3111	while (macsec->secy.rx_sc) {
3112		struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3113
3114		rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3115		free_rx_sc(rx_sc);
3116	}
3117
3118	for (i = 0; i < MACSEC_NUM_AN; i++) {
3119		struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3120
3121		if (sa) {
3122			RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3123			clear_tx_sa(sa);
3124		}
3125	}
3126}
3127
3128static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3129{
3130	struct macsec_dev *macsec = macsec_priv(dev);
3131	struct net_device *real_dev = macsec->real_dev;
3132
3133	unregister_netdevice_queue(dev, head);
3134	list_del_rcu(&macsec->secys);
3135	macsec_del_dev(macsec);
3136	netdev_upper_dev_unlink(real_dev, dev);
3137
3138	macsec_generation++;
3139}
3140
3141static void macsec_dellink(struct net_device *dev, struct list_head *head)
3142{
3143	struct macsec_dev *macsec = macsec_priv(dev);
3144	struct net_device *real_dev = macsec->real_dev;
3145	struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3146
3147	macsec_common_dellink(dev, head);
3148
3149	if (list_empty(&rxd->secys)) {
3150		netdev_rx_handler_unregister(real_dev);
3151		kfree(rxd);
3152	}
3153}
3154
3155static int register_macsec_dev(struct net_device *real_dev,
3156			       struct net_device *dev)
3157{
3158	struct macsec_dev *macsec = macsec_priv(dev);
3159	struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3160
3161	if (!rxd) {
3162		int err;
3163
3164		rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3165		if (!rxd)
3166			return -ENOMEM;
3167
3168		INIT_LIST_HEAD(&rxd->secys);
3169
3170		err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3171						 rxd);
3172		if (err < 0) {
3173			kfree(rxd);
3174			return err;
3175		}
3176	}
3177
3178	list_add_tail_rcu(&macsec->secys, &rxd->secys);
3179	return 0;
3180}
3181
3182static bool sci_exists(struct net_device *dev, sci_t sci)
3183{
3184	struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3185	struct macsec_dev *macsec;
3186
3187	list_for_each_entry(macsec, &rxd->secys, secys) {
3188		if (macsec->secy.sci == sci)
3189			return true;
3190	}
3191
3192	return false;
3193}
3194
3195static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3196{
3197	return make_sci(dev->dev_addr, port);
3198}
3199
3200static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3201{
3202	struct macsec_dev *macsec = macsec_priv(dev);
3203	struct macsec_secy *secy = &macsec->secy;
3204
3205	macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3206	if (!macsec->stats)
3207		return -ENOMEM;
3208
3209	secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3210	if (!secy->tx_sc.stats) {
3211		free_percpu(macsec->stats);
3212		return -ENOMEM;
3213	}
3214
3215	if (sci == MACSEC_UNDEF_SCI)
3216		sci = dev_to_sci(dev, MACSEC_PORT_ES);
3217
3218	secy->netdev = dev;
3219	secy->operational = true;
3220	secy->key_len = DEFAULT_SAK_LEN;
3221	secy->icv_len = icv_len;
3222	secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3223	secy->protect_frames = true;
3224	secy->replay_protect = false;
3225
3226	secy->sci = sci;
3227	secy->tx_sc.active = true;
3228	secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3229	secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3230	secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3231	secy->tx_sc.end_station = false;
3232	secy->tx_sc.scb = false;
3233
3234	return 0;
3235}
3236
3237static int macsec_newlink(struct net *net, struct net_device *dev,
3238			  struct nlattr *tb[], struct nlattr *data[],
3239			  struct netlink_ext_ack *extack)
3240{
3241	struct macsec_dev *macsec = macsec_priv(dev);
3242	struct net_device *real_dev;
3243	int err;
3244	sci_t sci;
3245	u8 icv_len = DEFAULT_ICV_LEN;
3246	rx_handler_func_t *rx_handler;
3247
3248	if (!tb[IFLA_LINK])
3249		return -EINVAL;
3250	real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3251	if (!real_dev)
3252		return -ENODEV;
3253
3254	dev->priv_flags |= IFF_MACSEC;
3255
3256	macsec->real_dev = real_dev;
3257
3258	if (data && data[IFLA_MACSEC_ICV_LEN])
3259		icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3260	dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3261
3262	rx_handler = rtnl_dereference(real_dev->rx_handler);
3263	if (rx_handler && rx_handler != macsec_handle_frame)
3264		return -EBUSY;
3265
3266	err = register_netdevice(dev);
3267	if (err < 0)
3268		return err;
3269
3270	dev_hold(real_dev);
3271
3272	macsec->nest_level = dev_get_nest_level(real_dev) + 1;
3273	netdev_lockdep_set_classes(dev);
3274	lockdep_set_class_and_subclass(&dev->addr_list_lock,
3275				       &macsec_netdev_addr_lock_key,
3276				       macsec_get_nest_level(dev));
3277
3278	err = netdev_upper_dev_link(real_dev, dev, extack);
3279	if (err < 0)
3280		goto unregister;
3281
3282	/* need to be already registered so that ->init has run and
3283	 * the MAC addr is set
3284	 */
3285	if (data && data[IFLA_MACSEC_SCI])
3286		sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3287	else if (data && data[IFLA_MACSEC_PORT])
3288		sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3289	else
3290		sci = dev_to_sci(dev, MACSEC_PORT_ES);
3291
3292	if (rx_handler && sci_exists(real_dev, sci)) {
3293		err = -EBUSY;
3294		goto unlink;
3295	}
3296
3297	err = macsec_add_dev(dev, sci, icv_len);
3298	if (err)
3299		goto unlink;
3300
3301	if (data) {
3302		err = macsec_changelink_common(dev, data);
3303		if (err)
3304			goto del_dev;
3305	}
3306
3307	err = register_macsec_dev(real_dev, dev);
3308	if (err < 0)
3309		goto del_dev;
3310
3311	macsec_generation++;
3312
3313	return 0;
3314
3315del_dev:
3316	macsec_del_dev(macsec);
3317unlink:
3318	netdev_upper_dev_unlink(real_dev, dev);
3319unregister:
3320	unregister_netdevice(dev);
3321	return err;
3322}
3323
3324static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
3325				struct netlink_ext_ack *extack)
3326{
3327	u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3328	u8 icv_len = DEFAULT_ICV_LEN;
3329	int flag;
3330	bool es, scb, sci;
3331
3332	if (!data)
3333		return 0;
3334
3335	if (data[IFLA_MACSEC_CIPHER_SUITE])
3336		csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3337
3338	if (data[IFLA_MACSEC_ICV_LEN]) {
3339		icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3340		if (icv_len != DEFAULT_ICV_LEN) {
3341			char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3342			struct crypto_aead *dummy_tfm;
3343
3344			dummy_tfm = macsec_alloc_tfm(dummy_key,
3345						     DEFAULT_SAK_LEN,
3346						     icv_len);
3347			if (IS_ERR(dummy_tfm))
3348				return PTR_ERR(dummy_tfm);
3349			crypto_free_aead(dummy_tfm);
3350		}
3351	}
3352
3353	switch (csid) {
3354	case MACSEC_CIPHER_ID_GCM_AES_128:
3355	case MACSEC_CIPHER_ID_GCM_AES_256:
3356	case MACSEC_DEFAULT_CIPHER_ID:
3357		if (icv_len < MACSEC_MIN_ICV_LEN ||
3358		    icv_len > MACSEC_STD_ICV_LEN)
3359			return -EINVAL;
3360		break;
3361	default:
3362		return -EINVAL;
3363	}
3364
3365	if (data[IFLA_MACSEC_ENCODING_SA]) {
3366		if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3367			return -EINVAL;
3368	}
3369
3370	for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3371	     flag < IFLA_MACSEC_VALIDATION;
3372	     flag++) {
3373		if (data[flag]) {
3374			if (nla_get_u8(data[flag]) > 1)
3375				return -EINVAL;
3376		}
3377	}
3378
3379	es  = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3380	sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3381	scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3382
3383	if ((sci && (scb || es)) || (scb && es))
3384		return -EINVAL;
3385
3386	if (data[IFLA_MACSEC_VALIDATION] &&
3387	    nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3388		return -EINVAL;
3389
3390	if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3391	     nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3392	    !data[IFLA_MACSEC_WINDOW])
3393		return -EINVAL;
3394
3395	return 0;
3396}
3397
3398static struct net *macsec_get_link_net(const struct net_device *dev)
3399{
3400	return dev_net(macsec_priv(dev)->real_dev);
3401}
3402
3403static size_t macsec_get_size(const struct net_device *dev)
3404{
3405	return  nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3406		nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3407		nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3408		nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3409		nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3410		nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3411		nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3412		nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3413		nla_total_size(1) + /* IFLA_MACSEC_ES */
3414		nla_total_size(1) + /* IFLA_MACSEC_SCB */
3415		nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3416		nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3417		0;
3418}
3419
3420static int macsec_fill_info(struct sk_buff *skb,
3421			    const struct net_device *dev)
3422{
3423	struct macsec_secy *secy = &macsec_priv(dev)->secy;
3424	struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3425	u64 csid;
3426
3427	switch (secy->key_len) {
3428	case MACSEC_GCM_AES_128_SAK_LEN:
3429		csid = MACSEC_DEFAULT_CIPHER_ID;
3430		break;
3431	case MACSEC_GCM_AES_256_SAK_LEN:
3432		csid = MACSEC_CIPHER_ID_GCM_AES_256;
3433		break;
3434	default:
3435		goto nla_put_failure;
3436	}
3437
3438	if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3439			IFLA_MACSEC_PAD) ||
3440	    nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3441	    nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3442			      csid, IFLA_MACSEC_PAD) ||
3443	    nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3444	    nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3445	    nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3446	    nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3447	    nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3448	    nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3449	    nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3450	    nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3451	    0)
3452		goto nla_put_failure;
3453
3454	if (secy->replay_protect) {
3455		if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3456			goto nla_put_failure;
3457	}
3458
3459	return 0;
3460
3461nla_put_failure:
3462	return -EMSGSIZE;
3463}
3464
3465static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3466	.kind		= "macsec",
3467	.priv_size	= sizeof(struct macsec_dev),
3468	.maxtype	= IFLA_MACSEC_MAX,
3469	.policy		= macsec_rtnl_policy,
3470	.setup		= macsec_setup,
3471	.validate	= macsec_validate_attr,
3472	.newlink	= macsec_newlink,
3473	.changelink	= macsec_changelink,
3474	.dellink	= macsec_dellink,
3475	.get_size	= macsec_get_size,
3476	.fill_info	= macsec_fill_info,
3477	.get_link_net	= macsec_get_link_net,
3478};
3479
3480static bool is_macsec_master(struct net_device *dev)
3481{
3482	return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3483}
3484
3485static int macsec_notify(struct notifier_block *this, unsigned long event,
3486			 void *ptr)
3487{
3488	struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3489	LIST_HEAD(head);
3490
3491	if (!is_macsec_master(real_dev))
3492		return NOTIFY_DONE;
3493
3494	switch (event) {
3495	case NETDEV_UNREGISTER: {
3496		struct macsec_dev *m, *n;
3497		struct macsec_rxh_data *rxd;
3498
3499		rxd = macsec_data_rtnl(real_dev);
3500		list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3501			macsec_common_dellink(m->secy.netdev, &head);
3502		}
3503
3504		netdev_rx_handler_unregister(real_dev);
3505		kfree(rxd);
3506
3507		unregister_netdevice_many(&head);
3508		break;
3509	}
3510	case NETDEV_CHANGEMTU: {
3511		struct macsec_dev *m;
3512		struct macsec_rxh_data *rxd;
3513
3514		rxd = macsec_data_rtnl(real_dev);
3515		list_for_each_entry(m, &rxd->secys, secys) {
3516			struct net_device *dev = m->secy.netdev;
3517			unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3518							    macsec_extra_len(true));
3519
3520			if (dev->mtu > mtu)
3521				dev_set_mtu(dev, mtu);
3522		}
3523	}
3524	}
3525
3526	return NOTIFY_OK;
3527}
3528
3529static struct notifier_block macsec_notifier = {
3530	.notifier_call = macsec_notify,
3531};
3532
3533static int __init macsec_init(void)
3534{
3535	int err;
3536
3537	pr_info("MACsec IEEE 802.1AE\n");
3538	err = register_netdevice_notifier(&macsec_notifier);
3539	if (err)
3540		return err;
3541
3542	err = rtnl_link_register(&macsec_link_ops);
3543	if (err)
3544		goto notifier;
3545
3546	err = genl_register_family(&macsec_fam);
3547	if (err)
3548		goto rtnl;
3549
3550	return 0;
3551
3552rtnl:
3553	rtnl_link_unregister(&macsec_link_ops);
3554notifier:
3555	unregister_netdevice_notifier(&macsec_notifier);
3556	return err;
3557}
3558
3559static void __exit macsec_exit(void)
3560{
3561	genl_unregister_family(&macsec_fam);
3562	rtnl_link_unregister(&macsec_link_ops);
3563	unregister_netdevice_notifier(&macsec_notifier);
3564	rcu_barrier();
3565}
3566
3567module_init(macsec_init);
3568module_exit(macsec_exit);
3569
3570MODULE_ALIAS_RTNL_LINK("macsec");
3571MODULE_ALIAS_GENL_FAMILY("macsec");
3572
3573MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3574MODULE_LICENSE("GPL v2");