xref: /openbmc/linux/drivers/net/macsec.c (revision d198b34f3855eee2571dda03eea75a09c7c31480)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * drivers/net/macsec.c - MACsec device
4  *
5  * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
6  */
7 
8 #include <linux/types.h>
9 #include <linux/skbuff.h>
10 #include <linux/socket.h>
11 #include <linux/module.h>
12 #include <crypto/aead.h>
13 #include <linux/etherdevice.h>
14 #include <linux/netdevice.h>
15 #include <linux/rtnetlink.h>
16 #include <linux/refcount.h>
17 #include <net/genetlink.h>
18 #include <net/sock.h>
19 #include <net/gro_cells.h>
20 #include <net/macsec.h>
21 #include <linux/phy.h>
22 
23 #include <uapi/linux/if_macsec.h>
24 
25 #define MACSEC_SCI_LEN 8
26 
27 /* SecTAG length = macsec_eth_header without the optional SCI */
28 #define MACSEC_TAG_LEN 6
29 
30 struct macsec_eth_header {
31 	struct ethhdr eth;
32 	/* SecTAG */
33 	u8  tci_an;
34 #if defined(__LITTLE_ENDIAN_BITFIELD)
35 	u8  short_length:6,
36 		  unused:2;
37 #elif defined(__BIG_ENDIAN_BITFIELD)
38 	u8        unused:2,
39 	    short_length:6;
40 #else
41 #error	"Please fix <asm/byteorder.h>"
42 #endif
43 	__be32 packet_number;
44 	u8 secure_channel_id[8]; /* optional */
45 } __packed;
46 
47 #define MACSEC_TCI_VERSION 0x80
48 #define MACSEC_TCI_ES      0x40 /* end station */
49 #define MACSEC_TCI_SC      0x20 /* SCI present */
50 #define MACSEC_TCI_SCB     0x10 /* epon */
51 #define MACSEC_TCI_E       0x08 /* encryption */
52 #define MACSEC_TCI_C       0x04 /* changed text */
53 #define MACSEC_AN_MASK     0x03 /* association number */
54 #define MACSEC_TCI_CONFID  (MACSEC_TCI_E | MACSEC_TCI_C)
55 
56 /* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
57 #define MIN_NON_SHORT_LEN 48
58 
59 #define GCM_AES_IV_LEN 12
60 #define DEFAULT_ICV_LEN 16
61 
62 #define for_each_rxsc(secy, sc)				\
63 	for (sc = rcu_dereference_bh(secy->rx_sc);	\
64 	     sc;					\
65 	     sc = rcu_dereference_bh(sc->next))
66 #define for_each_rxsc_rtnl(secy, sc)			\
67 	for (sc = rtnl_dereference(secy->rx_sc);	\
68 	     sc;					\
69 	     sc = rtnl_dereference(sc->next))
70 
71 struct gcm_iv {
72 	union {
73 		u8 secure_channel_id[8];
74 		sci_t sci;
75 	};
76 	__be32 pn;
77 };
78 
79 struct macsec_dev_stats {
80 	__u64 OutPktsUntagged;
81 	__u64 InPktsUntagged;
82 	__u64 OutPktsTooLong;
83 	__u64 InPktsNoTag;
84 	__u64 InPktsBadTag;
85 	__u64 InPktsUnknownSCI;
86 	__u64 InPktsNoSCI;
87 	__u64 InPktsOverrun;
88 };
89 
90 #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
91 
92 struct pcpu_secy_stats {
93 	struct macsec_dev_stats stats;
94 	struct u64_stats_sync syncp;
95 };
96 
97 /**
98  * struct macsec_dev - private data
99  * @secy: SecY config
100  * @real_dev: pointer to underlying netdevice
101  * @stats: MACsec device stats
102  * @secys: linked list of SecY's on the underlying device
103  * @offload: status of offloading on the MACsec device
104  */
105 struct macsec_dev {
106 	struct macsec_secy secy;
107 	struct net_device *real_dev;
108 	struct pcpu_secy_stats __percpu *stats;
109 	struct list_head secys;
110 	struct gro_cells gro_cells;
111 	enum macsec_offload offload;
112 };
113 
114 /**
115  * struct macsec_rxh_data - rx_handler private argument
116  * @secys: linked list of SecY's on this underlying device
117  */
118 struct macsec_rxh_data {
119 	struct list_head secys;
120 };
121 
122 static struct macsec_dev *macsec_priv(const struct net_device *dev)
123 {
124 	return (struct macsec_dev *)netdev_priv(dev);
125 }
126 
127 static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
128 {
129 	return rcu_dereference_bh(dev->rx_handler_data);
130 }
131 
132 static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
133 {
134 	return rtnl_dereference(dev->rx_handler_data);
135 }
136 
137 struct macsec_cb {
138 	struct aead_request *req;
139 	union {
140 		struct macsec_tx_sa *tx_sa;
141 		struct macsec_rx_sa *rx_sa;
142 	};
143 	u8 assoc_num;
144 	bool valid;
145 	bool has_sci;
146 };
147 
148 static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
149 {
150 	struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
151 
152 	if (!sa || !sa->active)
153 		return NULL;
154 
155 	if (!refcount_inc_not_zero(&sa->refcnt))
156 		return NULL;
157 
158 	return sa;
159 }
160 
161 static void free_rx_sc_rcu(struct rcu_head *head)
162 {
163 	struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
164 
165 	free_percpu(rx_sc->stats);
166 	kfree(rx_sc);
167 }
168 
169 static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
170 {
171 	return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
172 }
173 
174 static void macsec_rxsc_put(struct macsec_rx_sc *sc)
175 {
176 	if (refcount_dec_and_test(&sc->refcnt))
177 		call_rcu(&sc->rcu_head, free_rx_sc_rcu);
178 }
179 
180 static void free_rxsa(struct rcu_head *head)
181 {
182 	struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
183 
184 	crypto_free_aead(sa->key.tfm);
185 	free_percpu(sa->stats);
186 	kfree(sa);
187 }
188 
189 static void macsec_rxsa_put(struct macsec_rx_sa *sa)
190 {
191 	if (refcount_dec_and_test(&sa->refcnt))
192 		call_rcu(&sa->rcu, free_rxsa);
193 }
194 
195 static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
196 {
197 	struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
198 
199 	if (!sa || !sa->active)
200 		return NULL;
201 
202 	if (!refcount_inc_not_zero(&sa->refcnt))
203 		return NULL;
204 
205 	return sa;
206 }
207 
208 static void free_txsa(struct rcu_head *head)
209 {
210 	struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
211 
212 	crypto_free_aead(sa->key.tfm);
213 	free_percpu(sa->stats);
214 	kfree(sa);
215 }
216 
217 static void macsec_txsa_put(struct macsec_tx_sa *sa)
218 {
219 	if (refcount_dec_and_test(&sa->refcnt))
220 		call_rcu(&sa->rcu, free_txsa);
221 }
222 
223 static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
224 {
225 	BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
226 	return (struct macsec_cb *)skb->cb;
227 }
228 
229 #define MACSEC_PORT_ES (htons(0x0001))
230 #define MACSEC_PORT_SCB (0x0000)
231 #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
232 
233 #define MACSEC_GCM_AES_128_SAK_LEN 16
234 #define MACSEC_GCM_AES_256_SAK_LEN 32
235 
236 #define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
237 #define DEFAULT_SEND_SCI true
238 #define DEFAULT_ENCRYPT false
239 #define DEFAULT_ENCODING_SA 0
240 
241 static bool send_sci(const struct macsec_secy *secy)
242 {
243 	const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
244 
245 	return tx_sc->send_sci ||
246 		(secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
247 }
248 
249 static sci_t make_sci(u8 *addr, __be16 port)
250 {
251 	sci_t sci;
252 
253 	memcpy(&sci, addr, ETH_ALEN);
254 	memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
255 
256 	return sci;
257 }
258 
259 static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
260 {
261 	sci_t sci;
262 
263 	if (sci_present)
264 		memcpy(&sci, hdr->secure_channel_id,
265 		       sizeof(hdr->secure_channel_id));
266 	else
267 		sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
268 
269 	return sci;
270 }
271 
272 static unsigned int macsec_sectag_len(bool sci_present)
273 {
274 	return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
275 }
276 
277 static unsigned int macsec_hdr_len(bool sci_present)
278 {
279 	return macsec_sectag_len(sci_present) + ETH_HLEN;
280 }
281 
282 static unsigned int macsec_extra_len(bool sci_present)
283 {
284 	return macsec_sectag_len(sci_present) + sizeof(__be16);
285 }
286 
287 /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
288 static void macsec_fill_sectag(struct macsec_eth_header *h,
289 			       const struct macsec_secy *secy, u32 pn,
290 			       bool sci_present)
291 {
292 	const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
293 
294 	memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
295 	h->eth.h_proto = htons(ETH_P_MACSEC);
296 
297 	if (sci_present) {
298 		h->tci_an |= MACSEC_TCI_SC;
299 		memcpy(&h->secure_channel_id, &secy->sci,
300 		       sizeof(h->secure_channel_id));
301 	} else {
302 		if (tx_sc->end_station)
303 			h->tci_an |= MACSEC_TCI_ES;
304 		if (tx_sc->scb)
305 			h->tci_an |= MACSEC_TCI_SCB;
306 	}
307 
308 	h->packet_number = htonl(pn);
309 
310 	/* with GCM, C/E clear for !encrypt, both set for encrypt */
311 	if (tx_sc->encrypt)
312 		h->tci_an |= MACSEC_TCI_CONFID;
313 	else if (secy->icv_len != DEFAULT_ICV_LEN)
314 		h->tci_an |= MACSEC_TCI_C;
315 
316 	h->tci_an |= tx_sc->encoding_sa;
317 }
318 
319 static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
320 {
321 	if (data_len < MIN_NON_SHORT_LEN)
322 		h->short_length = data_len;
323 }
324 
325 /* Checks if a MACsec interface is being offloaded to an hardware engine */
326 static bool macsec_is_offloaded(struct macsec_dev *macsec)
327 {
328 	if (macsec->offload == MACSEC_OFFLOAD_PHY)
329 		return true;
330 
331 	return false;
332 }
333 
334 /* Checks if underlying layers implement MACsec offloading functions. */
335 static bool macsec_check_offload(enum macsec_offload offload,
336 				 struct macsec_dev *macsec)
337 {
338 	if (!macsec || !macsec->real_dev)
339 		return false;
340 
341 	if (offload == MACSEC_OFFLOAD_PHY)
342 		return macsec->real_dev->phydev &&
343 		       macsec->real_dev->phydev->macsec_ops;
344 
345 	return false;
346 }
347 
348 static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
349 						 struct macsec_dev *macsec,
350 						 struct macsec_context *ctx)
351 {
352 	if (ctx) {
353 		memset(ctx, 0, sizeof(*ctx));
354 		ctx->offload = offload;
355 
356 		if (offload == MACSEC_OFFLOAD_PHY)
357 			ctx->phydev = macsec->real_dev->phydev;
358 	}
359 
360 	return macsec->real_dev->phydev->macsec_ops;
361 }
362 
363 /* Returns a pointer to the MACsec ops struct if any and updates the MACsec
364  * context device reference if provided.
365  */
366 static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
367 					       struct macsec_context *ctx)
368 {
369 	if (!macsec_check_offload(macsec->offload, macsec))
370 		return NULL;
371 
372 	return __macsec_get_ops(macsec->offload, macsec, ctx);
373 }
374 
375 /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
376 static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
377 {
378 	struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
379 	int len = skb->len - 2 * ETH_ALEN;
380 	int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
381 
382 	/* a) It comprises at least 17 octets */
383 	if (skb->len <= 16)
384 		return false;
385 
386 	/* b) MACsec EtherType: already checked */
387 
388 	/* c) V bit is clear */
389 	if (h->tci_an & MACSEC_TCI_VERSION)
390 		return false;
391 
392 	/* d) ES or SCB => !SC */
393 	if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
394 	    (h->tci_an & MACSEC_TCI_SC))
395 		return false;
396 
397 	/* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
398 	if (h->unused)
399 		return false;
400 
401 	/* rx.pn != 0 (figure 10-5) */
402 	if (!h->packet_number)
403 		return false;
404 
405 	/* length check, f) g) h) i) */
406 	if (h->short_length)
407 		return len == extra_len + h->short_length;
408 	return len >= extra_len + MIN_NON_SHORT_LEN;
409 }
410 
411 #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
412 #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
413 
414 static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
415 {
416 	struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
417 
418 	gcm_iv->sci = sci;
419 	gcm_iv->pn = htonl(pn);
420 }
421 
422 static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
423 {
424 	return (struct macsec_eth_header *)skb_mac_header(skb);
425 }
426 
427 static sci_t dev_to_sci(struct net_device *dev, __be16 port)
428 {
429 	return make_sci(dev->dev_addr, port);
430 }
431 
432 static void __macsec_pn_wrapped(struct macsec_secy *secy,
433 				struct macsec_tx_sa *tx_sa)
434 {
435 	pr_debug("PN wrapped, transitioning to !oper\n");
436 	tx_sa->active = false;
437 	if (secy->protect_frames)
438 		secy->operational = false;
439 }
440 
441 void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
442 {
443 	spin_lock_bh(&tx_sa->lock);
444 	__macsec_pn_wrapped(secy, tx_sa);
445 	spin_unlock_bh(&tx_sa->lock);
446 }
447 EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
448 
449 static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
450 {
451 	u32 pn;
452 
453 	spin_lock_bh(&tx_sa->lock);
454 	pn = tx_sa->next_pn;
455 
456 	tx_sa->next_pn++;
457 	if (tx_sa->next_pn == 0)
458 		__macsec_pn_wrapped(secy, tx_sa);
459 	spin_unlock_bh(&tx_sa->lock);
460 
461 	return pn;
462 }
463 
464 static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
465 {
466 	struct macsec_dev *macsec = netdev_priv(dev);
467 
468 	skb->dev = macsec->real_dev;
469 	skb_reset_mac_header(skb);
470 	skb->protocol = eth_hdr(skb)->h_proto;
471 }
472 
473 static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
474 			    struct macsec_tx_sa *tx_sa)
475 {
476 	struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
477 
478 	u64_stats_update_begin(&txsc_stats->syncp);
479 	if (tx_sc->encrypt) {
480 		txsc_stats->stats.OutOctetsEncrypted += skb->len;
481 		txsc_stats->stats.OutPktsEncrypted++;
482 		this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
483 	} else {
484 		txsc_stats->stats.OutOctetsProtected += skb->len;
485 		txsc_stats->stats.OutPktsProtected++;
486 		this_cpu_inc(tx_sa->stats->OutPktsProtected);
487 	}
488 	u64_stats_update_end(&txsc_stats->syncp);
489 }
490 
491 static void count_tx(struct net_device *dev, int ret, int len)
492 {
493 	if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
494 		struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
495 
496 		u64_stats_update_begin(&stats->syncp);
497 		stats->tx_packets++;
498 		stats->tx_bytes += len;
499 		u64_stats_update_end(&stats->syncp);
500 	}
501 }
502 
503 static void macsec_encrypt_done(struct crypto_async_request *base, int err)
504 {
505 	struct sk_buff *skb = base->data;
506 	struct net_device *dev = skb->dev;
507 	struct macsec_dev *macsec = macsec_priv(dev);
508 	struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
509 	int len, ret;
510 
511 	aead_request_free(macsec_skb_cb(skb)->req);
512 
513 	rcu_read_lock_bh();
514 	macsec_encrypt_finish(skb, dev);
515 	macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
516 	len = skb->len;
517 	ret = dev_queue_xmit(skb);
518 	count_tx(dev, ret, len);
519 	rcu_read_unlock_bh();
520 
521 	macsec_txsa_put(sa);
522 	dev_put(dev);
523 }
524 
525 static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
526 					     unsigned char **iv,
527 					     struct scatterlist **sg,
528 					     int num_frags)
529 {
530 	size_t size, iv_offset, sg_offset;
531 	struct aead_request *req;
532 	void *tmp;
533 
534 	size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
535 	iv_offset = size;
536 	size += GCM_AES_IV_LEN;
537 
538 	size = ALIGN(size, __alignof__(struct scatterlist));
539 	sg_offset = size;
540 	size += sizeof(struct scatterlist) * num_frags;
541 
542 	tmp = kmalloc(size, GFP_ATOMIC);
543 	if (!tmp)
544 		return NULL;
545 
546 	*iv = (unsigned char *)(tmp + iv_offset);
547 	*sg = (struct scatterlist *)(tmp + sg_offset);
548 	req = tmp;
549 
550 	aead_request_set_tfm(req, tfm);
551 
552 	return req;
553 }
554 
555 static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
556 				      struct net_device *dev)
557 {
558 	int ret;
559 	struct scatterlist *sg;
560 	struct sk_buff *trailer;
561 	unsigned char *iv;
562 	struct ethhdr *eth;
563 	struct macsec_eth_header *hh;
564 	size_t unprotected_len;
565 	struct aead_request *req;
566 	struct macsec_secy *secy;
567 	struct macsec_tx_sc *tx_sc;
568 	struct macsec_tx_sa *tx_sa;
569 	struct macsec_dev *macsec = macsec_priv(dev);
570 	bool sci_present;
571 	u32 pn;
572 
573 	secy = &macsec->secy;
574 	tx_sc = &secy->tx_sc;
575 
576 	/* 10.5.1 TX SA assignment */
577 	tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
578 	if (!tx_sa) {
579 		secy->operational = false;
580 		kfree_skb(skb);
581 		return ERR_PTR(-EINVAL);
582 	}
583 
584 	if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
585 		     skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
586 		struct sk_buff *nskb = skb_copy_expand(skb,
587 						       MACSEC_NEEDED_HEADROOM,
588 						       MACSEC_NEEDED_TAILROOM,
589 						       GFP_ATOMIC);
590 		if (likely(nskb)) {
591 			consume_skb(skb);
592 			skb = nskb;
593 		} else {
594 			macsec_txsa_put(tx_sa);
595 			kfree_skb(skb);
596 			return ERR_PTR(-ENOMEM);
597 		}
598 	} else {
599 		skb = skb_unshare(skb, GFP_ATOMIC);
600 		if (!skb) {
601 			macsec_txsa_put(tx_sa);
602 			return ERR_PTR(-ENOMEM);
603 		}
604 	}
605 
606 	unprotected_len = skb->len;
607 	eth = eth_hdr(skb);
608 	sci_present = send_sci(secy);
609 	hh = skb_push(skb, macsec_extra_len(sci_present));
610 	memmove(hh, eth, 2 * ETH_ALEN);
611 
612 	pn = tx_sa_update_pn(tx_sa, secy);
613 	if (pn == 0) {
614 		macsec_txsa_put(tx_sa);
615 		kfree_skb(skb);
616 		return ERR_PTR(-ENOLINK);
617 	}
618 	macsec_fill_sectag(hh, secy, pn, sci_present);
619 	macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
620 
621 	skb_put(skb, secy->icv_len);
622 
623 	if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
624 		struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
625 
626 		u64_stats_update_begin(&secy_stats->syncp);
627 		secy_stats->stats.OutPktsTooLong++;
628 		u64_stats_update_end(&secy_stats->syncp);
629 
630 		macsec_txsa_put(tx_sa);
631 		kfree_skb(skb);
632 		return ERR_PTR(-EINVAL);
633 	}
634 
635 	ret = skb_cow_data(skb, 0, &trailer);
636 	if (unlikely(ret < 0)) {
637 		macsec_txsa_put(tx_sa);
638 		kfree_skb(skb);
639 		return ERR_PTR(ret);
640 	}
641 
642 	req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
643 	if (!req) {
644 		macsec_txsa_put(tx_sa);
645 		kfree_skb(skb);
646 		return ERR_PTR(-ENOMEM);
647 	}
648 
649 	macsec_fill_iv(iv, secy->sci, pn);
650 
651 	sg_init_table(sg, ret);
652 	ret = skb_to_sgvec(skb, sg, 0, skb->len);
653 	if (unlikely(ret < 0)) {
654 		aead_request_free(req);
655 		macsec_txsa_put(tx_sa);
656 		kfree_skb(skb);
657 		return ERR_PTR(ret);
658 	}
659 
660 	if (tx_sc->encrypt) {
661 		int len = skb->len - macsec_hdr_len(sci_present) -
662 			  secy->icv_len;
663 		aead_request_set_crypt(req, sg, sg, len, iv);
664 		aead_request_set_ad(req, macsec_hdr_len(sci_present));
665 	} else {
666 		aead_request_set_crypt(req, sg, sg, 0, iv);
667 		aead_request_set_ad(req, skb->len - secy->icv_len);
668 	}
669 
670 	macsec_skb_cb(skb)->req = req;
671 	macsec_skb_cb(skb)->tx_sa = tx_sa;
672 	aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
673 
674 	dev_hold(skb->dev);
675 	ret = crypto_aead_encrypt(req);
676 	if (ret == -EINPROGRESS) {
677 		return ERR_PTR(ret);
678 	} else if (ret != 0) {
679 		dev_put(skb->dev);
680 		kfree_skb(skb);
681 		aead_request_free(req);
682 		macsec_txsa_put(tx_sa);
683 		return ERR_PTR(-EINVAL);
684 	}
685 
686 	dev_put(skb->dev);
687 	aead_request_free(req);
688 	macsec_txsa_put(tx_sa);
689 
690 	return skb;
691 }
692 
693 static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
694 {
695 	struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
696 	struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
697 	struct macsec_eth_header *hdr = macsec_ethhdr(skb);
698 	u32 lowest_pn = 0;
699 
700 	spin_lock(&rx_sa->lock);
701 	if (rx_sa->next_pn >= secy->replay_window)
702 		lowest_pn = rx_sa->next_pn - secy->replay_window;
703 
704 	/* Now perform replay protection check again
705 	 * (see IEEE 802.1AE-2006 figure 10-5)
706 	 */
707 	if (secy->replay_protect && pn < lowest_pn) {
708 		spin_unlock(&rx_sa->lock);
709 		u64_stats_update_begin(&rxsc_stats->syncp);
710 		rxsc_stats->stats.InPktsLate++;
711 		u64_stats_update_end(&rxsc_stats->syncp);
712 		return false;
713 	}
714 
715 	if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
716 		u64_stats_update_begin(&rxsc_stats->syncp);
717 		if (hdr->tci_an & MACSEC_TCI_E)
718 			rxsc_stats->stats.InOctetsDecrypted += skb->len;
719 		else
720 			rxsc_stats->stats.InOctetsValidated += skb->len;
721 		u64_stats_update_end(&rxsc_stats->syncp);
722 	}
723 
724 	if (!macsec_skb_cb(skb)->valid) {
725 		spin_unlock(&rx_sa->lock);
726 
727 		/* 10.6.5 */
728 		if (hdr->tci_an & MACSEC_TCI_C ||
729 		    secy->validate_frames == MACSEC_VALIDATE_STRICT) {
730 			u64_stats_update_begin(&rxsc_stats->syncp);
731 			rxsc_stats->stats.InPktsNotValid++;
732 			u64_stats_update_end(&rxsc_stats->syncp);
733 			return false;
734 		}
735 
736 		u64_stats_update_begin(&rxsc_stats->syncp);
737 		if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
738 			rxsc_stats->stats.InPktsInvalid++;
739 			this_cpu_inc(rx_sa->stats->InPktsInvalid);
740 		} else if (pn < lowest_pn) {
741 			rxsc_stats->stats.InPktsDelayed++;
742 		} else {
743 			rxsc_stats->stats.InPktsUnchecked++;
744 		}
745 		u64_stats_update_end(&rxsc_stats->syncp);
746 	} else {
747 		u64_stats_update_begin(&rxsc_stats->syncp);
748 		if (pn < lowest_pn) {
749 			rxsc_stats->stats.InPktsDelayed++;
750 		} else {
751 			rxsc_stats->stats.InPktsOK++;
752 			this_cpu_inc(rx_sa->stats->InPktsOK);
753 		}
754 		u64_stats_update_end(&rxsc_stats->syncp);
755 
756 		if (pn >= rx_sa->next_pn)
757 			rx_sa->next_pn = pn + 1;
758 		spin_unlock(&rx_sa->lock);
759 	}
760 
761 	return true;
762 }
763 
764 static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
765 {
766 	skb->pkt_type = PACKET_HOST;
767 	skb->protocol = eth_type_trans(skb, dev);
768 
769 	skb_reset_network_header(skb);
770 	if (!skb_transport_header_was_set(skb))
771 		skb_reset_transport_header(skb);
772 	skb_reset_mac_len(skb);
773 }
774 
775 static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
776 {
777 	skb->ip_summed = CHECKSUM_NONE;
778 	memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
779 	skb_pull(skb, hdr_len);
780 	pskb_trim_unique(skb, skb->len - icv_len);
781 }
782 
783 static void count_rx(struct net_device *dev, int len)
784 {
785 	struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
786 
787 	u64_stats_update_begin(&stats->syncp);
788 	stats->rx_packets++;
789 	stats->rx_bytes += len;
790 	u64_stats_update_end(&stats->syncp);
791 }
792 
793 static void macsec_decrypt_done(struct crypto_async_request *base, int err)
794 {
795 	struct sk_buff *skb = base->data;
796 	struct net_device *dev = skb->dev;
797 	struct macsec_dev *macsec = macsec_priv(dev);
798 	struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
799 	struct macsec_rx_sc *rx_sc = rx_sa->sc;
800 	int len;
801 	u32 pn;
802 
803 	aead_request_free(macsec_skb_cb(skb)->req);
804 
805 	if (!err)
806 		macsec_skb_cb(skb)->valid = true;
807 
808 	rcu_read_lock_bh();
809 	pn = ntohl(macsec_ethhdr(skb)->packet_number);
810 	if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
811 		rcu_read_unlock_bh();
812 		kfree_skb(skb);
813 		goto out;
814 	}
815 
816 	macsec_finalize_skb(skb, macsec->secy.icv_len,
817 			    macsec_extra_len(macsec_skb_cb(skb)->has_sci));
818 	macsec_reset_skb(skb, macsec->secy.netdev);
819 
820 	len = skb->len;
821 	if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
822 		count_rx(dev, len);
823 
824 	rcu_read_unlock_bh();
825 
826 out:
827 	macsec_rxsa_put(rx_sa);
828 	macsec_rxsc_put(rx_sc);
829 	dev_put(dev);
830 }
831 
832 static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
833 				      struct net_device *dev,
834 				      struct macsec_rx_sa *rx_sa,
835 				      sci_t sci,
836 				      struct macsec_secy *secy)
837 {
838 	int ret;
839 	struct scatterlist *sg;
840 	struct sk_buff *trailer;
841 	unsigned char *iv;
842 	struct aead_request *req;
843 	struct macsec_eth_header *hdr;
844 	u16 icv_len = secy->icv_len;
845 
846 	macsec_skb_cb(skb)->valid = false;
847 	skb = skb_share_check(skb, GFP_ATOMIC);
848 	if (!skb)
849 		return ERR_PTR(-ENOMEM);
850 
851 	ret = skb_cow_data(skb, 0, &trailer);
852 	if (unlikely(ret < 0)) {
853 		kfree_skb(skb);
854 		return ERR_PTR(ret);
855 	}
856 	req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
857 	if (!req) {
858 		kfree_skb(skb);
859 		return ERR_PTR(-ENOMEM);
860 	}
861 
862 	hdr = (struct macsec_eth_header *)skb->data;
863 	macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
864 
865 	sg_init_table(sg, ret);
866 	ret = skb_to_sgvec(skb, sg, 0, skb->len);
867 	if (unlikely(ret < 0)) {
868 		aead_request_free(req);
869 		kfree_skb(skb);
870 		return ERR_PTR(ret);
871 	}
872 
873 	if (hdr->tci_an & MACSEC_TCI_E) {
874 		/* confidentiality: ethernet + macsec header
875 		 * authenticated, encrypted payload
876 		 */
877 		int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
878 
879 		aead_request_set_crypt(req, sg, sg, len, iv);
880 		aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
881 		skb = skb_unshare(skb, GFP_ATOMIC);
882 		if (!skb) {
883 			aead_request_free(req);
884 			return ERR_PTR(-ENOMEM);
885 		}
886 	} else {
887 		/* integrity only: all headers + data authenticated */
888 		aead_request_set_crypt(req, sg, sg, icv_len, iv);
889 		aead_request_set_ad(req, skb->len - icv_len);
890 	}
891 
892 	macsec_skb_cb(skb)->req = req;
893 	skb->dev = dev;
894 	aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
895 
896 	dev_hold(dev);
897 	ret = crypto_aead_decrypt(req);
898 	if (ret == -EINPROGRESS) {
899 		return ERR_PTR(ret);
900 	} else if (ret != 0) {
901 		/* decryption/authentication failed
902 		 * 10.6 if validateFrames is disabled, deliver anyway
903 		 */
904 		if (ret != -EBADMSG) {
905 			kfree_skb(skb);
906 			skb = ERR_PTR(ret);
907 		}
908 	} else {
909 		macsec_skb_cb(skb)->valid = true;
910 	}
911 	dev_put(dev);
912 
913 	aead_request_free(req);
914 
915 	return skb;
916 }
917 
918 static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
919 {
920 	struct macsec_rx_sc *rx_sc;
921 
922 	for_each_rxsc(secy, rx_sc) {
923 		if (rx_sc->sci == sci)
924 			return rx_sc;
925 	}
926 
927 	return NULL;
928 }
929 
930 static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
931 {
932 	struct macsec_rx_sc *rx_sc;
933 
934 	for_each_rxsc_rtnl(secy, rx_sc) {
935 		if (rx_sc->sci == sci)
936 			return rx_sc;
937 	}
938 
939 	return NULL;
940 }
941 
942 static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
943 {
944 	/* Deliver to the uncontrolled port by default */
945 	enum rx_handler_result ret = RX_HANDLER_PASS;
946 	struct macsec_rxh_data *rxd;
947 	struct macsec_dev *macsec;
948 
949 	rcu_read_lock();
950 	rxd = macsec_data_rcu(skb->dev);
951 
952 	/* 10.6 If the management control validateFrames is not
953 	 * Strict, frames without a SecTAG are received, counted, and
954 	 * delivered to the Controlled Port
955 	 */
956 	list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
957 		struct sk_buff *nskb;
958 		struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
959 
960 		if (!macsec_is_offloaded(macsec) &&
961 		    macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
962 			u64_stats_update_begin(&secy_stats->syncp);
963 			secy_stats->stats.InPktsNoTag++;
964 			u64_stats_update_end(&secy_stats->syncp);
965 			continue;
966 		}
967 
968 		/* deliver on this port */
969 		nskb = skb_clone(skb, GFP_ATOMIC);
970 		if (!nskb)
971 			break;
972 
973 		nskb->dev = macsec->secy.netdev;
974 
975 		if (netif_rx(nskb) == NET_RX_SUCCESS) {
976 			u64_stats_update_begin(&secy_stats->syncp);
977 			secy_stats->stats.InPktsUntagged++;
978 			u64_stats_update_end(&secy_stats->syncp);
979 		}
980 
981 		if (netif_running(macsec->secy.netdev) &&
982 		    macsec_is_offloaded(macsec)) {
983 			ret = RX_HANDLER_EXACT;
984 			goto out;
985 		}
986 	}
987 
988 out:
989 	rcu_read_unlock();
990 	return ret;
991 }
992 
993 static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
994 {
995 	struct sk_buff *skb = *pskb;
996 	struct net_device *dev = skb->dev;
997 	struct macsec_eth_header *hdr;
998 	struct macsec_secy *secy = NULL;
999 	struct macsec_rx_sc *rx_sc;
1000 	struct macsec_rx_sa *rx_sa;
1001 	struct macsec_rxh_data *rxd;
1002 	struct macsec_dev *macsec;
1003 	sci_t sci;
1004 	u32 pn;
1005 	bool cbit;
1006 	struct pcpu_rx_sc_stats *rxsc_stats;
1007 	struct pcpu_secy_stats *secy_stats;
1008 	bool pulled_sci;
1009 	int ret;
1010 
1011 	if (skb_headroom(skb) < ETH_HLEN)
1012 		goto drop_direct;
1013 
1014 	hdr = macsec_ethhdr(skb);
1015 	if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1016 		return handle_not_macsec(skb);
1017 
1018 	skb = skb_unshare(skb, GFP_ATOMIC);
1019 	*pskb = skb;
1020 	if (!skb)
1021 		return RX_HANDLER_CONSUMED;
1022 
1023 	pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1024 	if (!pulled_sci) {
1025 		if (!pskb_may_pull(skb, macsec_extra_len(false)))
1026 			goto drop_direct;
1027 	}
1028 
1029 	hdr = macsec_ethhdr(skb);
1030 
1031 	/* Frames with a SecTAG that has the TCI E bit set but the C
1032 	 * bit clear are discarded, as this reserved encoding is used
1033 	 * to identify frames with a SecTAG that are not to be
1034 	 * delivered to the Controlled Port.
1035 	 */
1036 	if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1037 		return RX_HANDLER_PASS;
1038 
1039 	/* now, pull the extra length */
1040 	if (hdr->tci_an & MACSEC_TCI_SC) {
1041 		if (!pulled_sci)
1042 			goto drop_direct;
1043 	}
1044 
1045 	/* ethernet header is part of crypto processing */
1046 	skb_push(skb, ETH_HLEN);
1047 
1048 	macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1049 	macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1050 	sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1051 
1052 	rcu_read_lock();
1053 	rxd = macsec_data_rcu(skb->dev);
1054 
1055 	list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1056 		struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1057 
1058 		sc = sc ? macsec_rxsc_get(sc) : NULL;
1059 
1060 		if (sc) {
1061 			secy = &macsec->secy;
1062 			rx_sc = sc;
1063 			break;
1064 		}
1065 	}
1066 
1067 	if (!secy)
1068 		goto nosci;
1069 
1070 	dev = secy->netdev;
1071 	macsec = macsec_priv(dev);
1072 	secy_stats = this_cpu_ptr(macsec->stats);
1073 	rxsc_stats = this_cpu_ptr(rx_sc->stats);
1074 
1075 	if (!macsec_validate_skb(skb, secy->icv_len)) {
1076 		u64_stats_update_begin(&secy_stats->syncp);
1077 		secy_stats->stats.InPktsBadTag++;
1078 		u64_stats_update_end(&secy_stats->syncp);
1079 		goto drop_nosa;
1080 	}
1081 
1082 	rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1083 	if (!rx_sa) {
1084 		/* 10.6.1 if the SA is not in use */
1085 
1086 		/* If validateFrames is Strict or the C bit in the
1087 		 * SecTAG is set, discard
1088 		 */
1089 		if (hdr->tci_an & MACSEC_TCI_C ||
1090 		    secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1091 			u64_stats_update_begin(&rxsc_stats->syncp);
1092 			rxsc_stats->stats.InPktsNotUsingSA++;
1093 			u64_stats_update_end(&rxsc_stats->syncp);
1094 			goto drop_nosa;
1095 		}
1096 
1097 		/* not Strict, the frame (with the SecTAG and ICV
1098 		 * removed) is delivered to the Controlled Port.
1099 		 */
1100 		u64_stats_update_begin(&rxsc_stats->syncp);
1101 		rxsc_stats->stats.InPktsUnusedSA++;
1102 		u64_stats_update_end(&rxsc_stats->syncp);
1103 		goto deliver;
1104 	}
1105 
1106 	/* First, PN check to avoid decrypting obviously wrong packets */
1107 	pn = ntohl(hdr->packet_number);
1108 	if (secy->replay_protect) {
1109 		bool late;
1110 
1111 		spin_lock(&rx_sa->lock);
1112 		late = rx_sa->next_pn >= secy->replay_window &&
1113 		       pn < (rx_sa->next_pn - secy->replay_window);
1114 		spin_unlock(&rx_sa->lock);
1115 
1116 		if (late) {
1117 			u64_stats_update_begin(&rxsc_stats->syncp);
1118 			rxsc_stats->stats.InPktsLate++;
1119 			u64_stats_update_end(&rxsc_stats->syncp);
1120 			goto drop;
1121 		}
1122 	}
1123 
1124 	macsec_skb_cb(skb)->rx_sa = rx_sa;
1125 
1126 	/* Disabled && !changed text => skip validation */
1127 	if (hdr->tci_an & MACSEC_TCI_C ||
1128 	    secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1129 		skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1130 
1131 	if (IS_ERR(skb)) {
1132 		/* the decrypt callback needs the reference */
1133 		if (PTR_ERR(skb) != -EINPROGRESS) {
1134 			macsec_rxsa_put(rx_sa);
1135 			macsec_rxsc_put(rx_sc);
1136 		}
1137 		rcu_read_unlock();
1138 		*pskb = NULL;
1139 		return RX_HANDLER_CONSUMED;
1140 	}
1141 
1142 	if (!macsec_post_decrypt(skb, secy, pn))
1143 		goto drop;
1144 
1145 deliver:
1146 	macsec_finalize_skb(skb, secy->icv_len,
1147 			    macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1148 	macsec_reset_skb(skb, secy->netdev);
1149 
1150 	if (rx_sa)
1151 		macsec_rxsa_put(rx_sa);
1152 	macsec_rxsc_put(rx_sc);
1153 
1154 	skb_orphan(skb);
1155 	ret = gro_cells_receive(&macsec->gro_cells, skb);
1156 	if (ret == NET_RX_SUCCESS)
1157 		count_rx(dev, skb->len);
1158 	else
1159 		macsec->secy.netdev->stats.rx_dropped++;
1160 
1161 	rcu_read_unlock();
1162 
1163 	*pskb = NULL;
1164 	return RX_HANDLER_CONSUMED;
1165 
1166 drop:
1167 	macsec_rxsa_put(rx_sa);
1168 drop_nosa:
1169 	macsec_rxsc_put(rx_sc);
1170 	rcu_read_unlock();
1171 drop_direct:
1172 	kfree_skb(skb);
1173 	*pskb = NULL;
1174 	return RX_HANDLER_CONSUMED;
1175 
1176 nosci:
1177 	/* 10.6.1 if the SC is not found */
1178 	cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1179 	if (!cbit)
1180 		macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1181 				    macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1182 
1183 	list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1184 		struct sk_buff *nskb;
1185 
1186 		secy_stats = this_cpu_ptr(macsec->stats);
1187 
1188 		/* If validateFrames is Strict or the C bit in the
1189 		 * SecTAG is set, discard
1190 		 */
1191 		if (cbit ||
1192 		    macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1193 			u64_stats_update_begin(&secy_stats->syncp);
1194 			secy_stats->stats.InPktsNoSCI++;
1195 			u64_stats_update_end(&secy_stats->syncp);
1196 			continue;
1197 		}
1198 
1199 		/* not strict, the frame (with the SecTAG and ICV
1200 		 * removed) is delivered to the Controlled Port.
1201 		 */
1202 		nskb = skb_clone(skb, GFP_ATOMIC);
1203 		if (!nskb)
1204 			break;
1205 
1206 		macsec_reset_skb(nskb, macsec->secy.netdev);
1207 
1208 		ret = netif_rx(nskb);
1209 		if (ret == NET_RX_SUCCESS) {
1210 			u64_stats_update_begin(&secy_stats->syncp);
1211 			secy_stats->stats.InPktsUnknownSCI++;
1212 			u64_stats_update_end(&secy_stats->syncp);
1213 		} else {
1214 			macsec->secy.netdev->stats.rx_dropped++;
1215 		}
1216 	}
1217 
1218 	rcu_read_unlock();
1219 	*pskb = skb;
1220 	return RX_HANDLER_PASS;
1221 }
1222 
1223 static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1224 {
1225 	struct crypto_aead *tfm;
1226 	int ret;
1227 
1228 	tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1229 
1230 	if (IS_ERR(tfm))
1231 		return tfm;
1232 
1233 	ret = crypto_aead_setkey(tfm, key, key_len);
1234 	if (ret < 0)
1235 		goto fail;
1236 
1237 	ret = crypto_aead_setauthsize(tfm, icv_len);
1238 	if (ret < 0)
1239 		goto fail;
1240 
1241 	return tfm;
1242 fail:
1243 	crypto_free_aead(tfm);
1244 	return ERR_PTR(ret);
1245 }
1246 
1247 static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1248 		      int icv_len)
1249 {
1250 	rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1251 	if (!rx_sa->stats)
1252 		return -ENOMEM;
1253 
1254 	rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1255 	if (IS_ERR(rx_sa->key.tfm)) {
1256 		free_percpu(rx_sa->stats);
1257 		return PTR_ERR(rx_sa->key.tfm);
1258 	}
1259 
1260 	rx_sa->active = false;
1261 	rx_sa->next_pn = 1;
1262 	refcount_set(&rx_sa->refcnt, 1);
1263 	spin_lock_init(&rx_sa->lock);
1264 
1265 	return 0;
1266 }
1267 
1268 static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1269 {
1270 	rx_sa->active = false;
1271 
1272 	macsec_rxsa_put(rx_sa);
1273 }
1274 
1275 static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1276 {
1277 	int i;
1278 
1279 	for (i = 0; i < MACSEC_NUM_AN; i++) {
1280 		struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1281 
1282 		RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1283 		if (sa)
1284 			clear_rx_sa(sa);
1285 	}
1286 
1287 	macsec_rxsc_put(rx_sc);
1288 }
1289 
1290 static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1291 {
1292 	struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1293 
1294 	for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1295 	     rx_sc;
1296 	     rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1297 		if (rx_sc->sci == sci) {
1298 			if (rx_sc->active)
1299 				secy->n_rx_sc--;
1300 			rcu_assign_pointer(*rx_scp, rx_sc->next);
1301 			return rx_sc;
1302 		}
1303 	}
1304 
1305 	return NULL;
1306 }
1307 
1308 static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1309 {
1310 	struct macsec_rx_sc *rx_sc;
1311 	struct macsec_dev *macsec;
1312 	struct net_device *real_dev = macsec_priv(dev)->real_dev;
1313 	struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1314 	struct macsec_secy *secy;
1315 
1316 	list_for_each_entry(macsec, &rxd->secys, secys) {
1317 		if (find_rx_sc_rtnl(&macsec->secy, sci))
1318 			return ERR_PTR(-EEXIST);
1319 	}
1320 
1321 	rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1322 	if (!rx_sc)
1323 		return ERR_PTR(-ENOMEM);
1324 
1325 	rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1326 	if (!rx_sc->stats) {
1327 		kfree(rx_sc);
1328 		return ERR_PTR(-ENOMEM);
1329 	}
1330 
1331 	rx_sc->sci = sci;
1332 	rx_sc->active = true;
1333 	refcount_set(&rx_sc->refcnt, 1);
1334 
1335 	secy = &macsec_priv(dev)->secy;
1336 	rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1337 	rcu_assign_pointer(secy->rx_sc, rx_sc);
1338 
1339 	if (rx_sc->active)
1340 		secy->n_rx_sc++;
1341 
1342 	return rx_sc;
1343 }
1344 
1345 static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1346 		      int icv_len)
1347 {
1348 	tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1349 	if (!tx_sa->stats)
1350 		return -ENOMEM;
1351 
1352 	tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1353 	if (IS_ERR(tx_sa->key.tfm)) {
1354 		free_percpu(tx_sa->stats);
1355 		return PTR_ERR(tx_sa->key.tfm);
1356 	}
1357 
1358 	tx_sa->active = false;
1359 	refcount_set(&tx_sa->refcnt, 1);
1360 	spin_lock_init(&tx_sa->lock);
1361 
1362 	return 0;
1363 }
1364 
1365 static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1366 {
1367 	tx_sa->active = false;
1368 
1369 	macsec_txsa_put(tx_sa);
1370 }
1371 
1372 static struct genl_family macsec_fam;
1373 
1374 static struct net_device *get_dev_from_nl(struct net *net,
1375 					  struct nlattr **attrs)
1376 {
1377 	int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1378 	struct net_device *dev;
1379 
1380 	dev = __dev_get_by_index(net, ifindex);
1381 	if (!dev)
1382 		return ERR_PTR(-ENODEV);
1383 
1384 	if (!netif_is_macsec(dev))
1385 		return ERR_PTR(-ENODEV);
1386 
1387 	return dev;
1388 }
1389 
1390 static sci_t nla_get_sci(const struct nlattr *nla)
1391 {
1392 	return (__force sci_t)nla_get_u64(nla);
1393 }
1394 
1395 static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1396 		       int padattr)
1397 {
1398 	return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1399 }
1400 
1401 static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1402 					     struct nlattr **attrs,
1403 					     struct nlattr **tb_sa,
1404 					     struct net_device **devp,
1405 					     struct macsec_secy **secyp,
1406 					     struct macsec_tx_sc **scp,
1407 					     u8 *assoc_num)
1408 {
1409 	struct net_device *dev;
1410 	struct macsec_secy *secy;
1411 	struct macsec_tx_sc *tx_sc;
1412 	struct macsec_tx_sa *tx_sa;
1413 
1414 	if (!tb_sa[MACSEC_SA_ATTR_AN])
1415 		return ERR_PTR(-EINVAL);
1416 
1417 	*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1418 
1419 	dev = get_dev_from_nl(net, attrs);
1420 	if (IS_ERR(dev))
1421 		return ERR_CAST(dev);
1422 
1423 	if (*assoc_num >= MACSEC_NUM_AN)
1424 		return ERR_PTR(-EINVAL);
1425 
1426 	secy = &macsec_priv(dev)->secy;
1427 	tx_sc = &secy->tx_sc;
1428 
1429 	tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1430 	if (!tx_sa)
1431 		return ERR_PTR(-ENODEV);
1432 
1433 	*devp = dev;
1434 	*scp = tx_sc;
1435 	*secyp = secy;
1436 	return tx_sa;
1437 }
1438 
1439 static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1440 					     struct nlattr **attrs,
1441 					     struct nlattr **tb_rxsc,
1442 					     struct net_device **devp,
1443 					     struct macsec_secy **secyp)
1444 {
1445 	struct net_device *dev;
1446 	struct macsec_secy *secy;
1447 	struct macsec_rx_sc *rx_sc;
1448 	sci_t sci;
1449 
1450 	dev = get_dev_from_nl(net, attrs);
1451 	if (IS_ERR(dev))
1452 		return ERR_CAST(dev);
1453 
1454 	secy = &macsec_priv(dev)->secy;
1455 
1456 	if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1457 		return ERR_PTR(-EINVAL);
1458 
1459 	sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1460 	rx_sc = find_rx_sc_rtnl(secy, sci);
1461 	if (!rx_sc)
1462 		return ERR_PTR(-ENODEV);
1463 
1464 	*secyp = secy;
1465 	*devp = dev;
1466 
1467 	return rx_sc;
1468 }
1469 
1470 static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1471 					     struct nlattr **attrs,
1472 					     struct nlattr **tb_rxsc,
1473 					     struct nlattr **tb_sa,
1474 					     struct net_device **devp,
1475 					     struct macsec_secy **secyp,
1476 					     struct macsec_rx_sc **scp,
1477 					     u8 *assoc_num)
1478 {
1479 	struct macsec_rx_sc *rx_sc;
1480 	struct macsec_rx_sa *rx_sa;
1481 
1482 	if (!tb_sa[MACSEC_SA_ATTR_AN])
1483 		return ERR_PTR(-EINVAL);
1484 
1485 	*assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1486 	if (*assoc_num >= MACSEC_NUM_AN)
1487 		return ERR_PTR(-EINVAL);
1488 
1489 	rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1490 	if (IS_ERR(rx_sc))
1491 		return ERR_CAST(rx_sc);
1492 
1493 	rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1494 	if (!rx_sa)
1495 		return ERR_PTR(-ENODEV);
1496 
1497 	*scp = rx_sc;
1498 	return rx_sa;
1499 }
1500 
1501 static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1502 	[MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1503 	[MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1504 	[MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1505 	[MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1506 };
1507 
1508 static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1509 	[MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1510 	[MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1511 };
1512 
1513 static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1514 	[MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1515 	[MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1516 	[MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1517 	[MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1518 				   .len = MACSEC_KEYID_LEN, },
1519 	[MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1520 				 .len = MACSEC_MAX_KEY_LEN, },
1521 };
1522 
1523 static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1524 	[MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1525 };
1526 
1527 /* Offloads an operation to a device driver */
1528 static int macsec_offload(int (* const func)(struct macsec_context *),
1529 			  struct macsec_context *ctx)
1530 {
1531 	int ret;
1532 
1533 	if (unlikely(!func))
1534 		return 0;
1535 
1536 	if (ctx->offload == MACSEC_OFFLOAD_PHY)
1537 		mutex_lock(&ctx->phydev->lock);
1538 
1539 	/* Phase I: prepare. The drive should fail here if there are going to be
1540 	 * issues in the commit phase.
1541 	 */
1542 	ctx->prepare = true;
1543 	ret = (*func)(ctx);
1544 	if (ret)
1545 		goto phy_unlock;
1546 
1547 	/* Phase II: commit. This step cannot fail. */
1548 	ctx->prepare = false;
1549 	ret = (*func)(ctx);
1550 	/* This should never happen: commit is not allowed to fail */
1551 	if (unlikely(ret))
1552 		WARN(1, "MACsec offloading commit failed (%d)\n", ret);
1553 
1554 phy_unlock:
1555 	if (ctx->offload == MACSEC_OFFLOAD_PHY)
1556 		mutex_unlock(&ctx->phydev->lock);
1557 
1558 	return ret;
1559 }
1560 
1561 static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1562 {
1563 	if (!attrs[MACSEC_ATTR_SA_CONFIG])
1564 		return -EINVAL;
1565 
1566 	if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1567 		return -EINVAL;
1568 
1569 	return 0;
1570 }
1571 
1572 static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1573 {
1574 	if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1575 		return -EINVAL;
1576 
1577 	if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1578 		return -EINVAL;
1579 
1580 	return 0;
1581 }
1582 
1583 static bool validate_add_rxsa(struct nlattr **attrs)
1584 {
1585 	if (!attrs[MACSEC_SA_ATTR_AN] ||
1586 	    !attrs[MACSEC_SA_ATTR_KEY] ||
1587 	    !attrs[MACSEC_SA_ATTR_KEYID])
1588 		return false;
1589 
1590 	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1591 		return false;
1592 
1593 	if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1594 		return false;
1595 
1596 	if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1597 		if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1598 			return false;
1599 	}
1600 
1601 	if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1602 		return false;
1603 
1604 	return true;
1605 }
1606 
1607 static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1608 {
1609 	struct net_device *dev;
1610 	struct nlattr **attrs = info->attrs;
1611 	struct macsec_secy *secy;
1612 	struct macsec_rx_sc *rx_sc;
1613 	struct macsec_rx_sa *rx_sa;
1614 	unsigned char assoc_num;
1615 	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1616 	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1617 	int err;
1618 
1619 	if (!attrs[MACSEC_ATTR_IFINDEX])
1620 		return -EINVAL;
1621 
1622 	if (parse_sa_config(attrs, tb_sa))
1623 		return -EINVAL;
1624 
1625 	if (parse_rxsc_config(attrs, tb_rxsc))
1626 		return -EINVAL;
1627 
1628 	if (!validate_add_rxsa(tb_sa))
1629 		return -EINVAL;
1630 
1631 	rtnl_lock();
1632 	rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1633 	if (IS_ERR(rx_sc)) {
1634 		rtnl_unlock();
1635 		return PTR_ERR(rx_sc);
1636 	}
1637 
1638 	assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1639 
1640 	if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1641 		pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1642 			  nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1643 		rtnl_unlock();
1644 		return -EINVAL;
1645 	}
1646 
1647 	rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1648 	if (rx_sa) {
1649 		rtnl_unlock();
1650 		return -EBUSY;
1651 	}
1652 
1653 	rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1654 	if (!rx_sa) {
1655 		rtnl_unlock();
1656 		return -ENOMEM;
1657 	}
1658 
1659 	err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1660 			 secy->key_len, secy->icv_len);
1661 	if (err < 0) {
1662 		kfree(rx_sa);
1663 		rtnl_unlock();
1664 		return err;
1665 	}
1666 
1667 	if (tb_sa[MACSEC_SA_ATTR_PN]) {
1668 		spin_lock_bh(&rx_sa->lock);
1669 		rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1670 		spin_unlock_bh(&rx_sa->lock);
1671 	}
1672 
1673 	if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1674 		rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1675 
1676 	rx_sa->sc = rx_sc;
1677 
1678 	/* If h/w offloading is available, propagate to the device */
1679 	if (macsec_is_offloaded(netdev_priv(dev))) {
1680 		const struct macsec_ops *ops;
1681 		struct macsec_context ctx;
1682 
1683 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
1684 		if (!ops) {
1685 			err = -EOPNOTSUPP;
1686 			goto cleanup;
1687 		}
1688 
1689 		ctx.sa.assoc_num = assoc_num;
1690 		ctx.sa.rx_sa = rx_sa;
1691 		memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1692 		       MACSEC_KEYID_LEN);
1693 
1694 		err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1695 		if (err)
1696 			goto cleanup;
1697 	}
1698 
1699 	nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1700 	rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1701 
1702 	rtnl_unlock();
1703 
1704 	return 0;
1705 
1706 cleanup:
1707 	kfree(rx_sa);
1708 	rtnl_unlock();
1709 	return err;
1710 }
1711 
1712 static bool validate_add_rxsc(struct nlattr **attrs)
1713 {
1714 	if (!attrs[MACSEC_RXSC_ATTR_SCI])
1715 		return false;
1716 
1717 	if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1718 		if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1719 			return false;
1720 	}
1721 
1722 	return true;
1723 }
1724 
1725 static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1726 {
1727 	struct net_device *dev;
1728 	sci_t sci = MACSEC_UNDEF_SCI;
1729 	struct nlattr **attrs = info->attrs;
1730 	struct macsec_rx_sc *rx_sc;
1731 	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1732 	bool was_active;
1733 	int ret;
1734 
1735 	if (!attrs[MACSEC_ATTR_IFINDEX])
1736 		return -EINVAL;
1737 
1738 	if (parse_rxsc_config(attrs, tb_rxsc))
1739 		return -EINVAL;
1740 
1741 	if (!validate_add_rxsc(tb_rxsc))
1742 		return -EINVAL;
1743 
1744 	rtnl_lock();
1745 	dev = get_dev_from_nl(genl_info_net(info), attrs);
1746 	if (IS_ERR(dev)) {
1747 		rtnl_unlock();
1748 		return PTR_ERR(dev);
1749 	}
1750 
1751 	sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1752 
1753 	rx_sc = create_rx_sc(dev, sci);
1754 	if (IS_ERR(rx_sc)) {
1755 		rtnl_unlock();
1756 		return PTR_ERR(rx_sc);
1757 	}
1758 
1759 	was_active = rx_sc->active;
1760 	if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1761 		rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1762 
1763 	if (macsec_is_offloaded(netdev_priv(dev))) {
1764 		const struct macsec_ops *ops;
1765 		struct macsec_context ctx;
1766 
1767 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
1768 		if (!ops) {
1769 			ret = -EOPNOTSUPP;
1770 			goto cleanup;
1771 		}
1772 
1773 		ctx.rx_sc = rx_sc;
1774 
1775 		ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1776 		if (ret)
1777 			goto cleanup;
1778 	}
1779 
1780 	rtnl_unlock();
1781 
1782 	return 0;
1783 
1784 cleanup:
1785 	rx_sc->active = was_active;
1786 	rtnl_unlock();
1787 	return ret;
1788 }
1789 
1790 static 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 
1815 static 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 	bool was_operational;
1825 	int err;
1826 
1827 	if (!attrs[MACSEC_ATTR_IFINDEX])
1828 		return -EINVAL;
1829 
1830 	if (parse_sa_config(attrs, tb_sa))
1831 		return -EINVAL;
1832 
1833 	if (!validate_add_txsa(tb_sa))
1834 		return -EINVAL;
1835 
1836 	rtnl_lock();
1837 	dev = get_dev_from_nl(genl_info_net(info), attrs);
1838 	if (IS_ERR(dev)) {
1839 		rtnl_unlock();
1840 		return PTR_ERR(dev);
1841 	}
1842 
1843 	secy = &macsec_priv(dev)->secy;
1844 	tx_sc = &secy->tx_sc;
1845 
1846 	assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1847 
1848 	if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1849 		pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1850 			  nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1851 		rtnl_unlock();
1852 		return -EINVAL;
1853 	}
1854 
1855 	tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1856 	if (tx_sa) {
1857 		rtnl_unlock();
1858 		return -EBUSY;
1859 	}
1860 
1861 	tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1862 	if (!tx_sa) {
1863 		rtnl_unlock();
1864 		return -ENOMEM;
1865 	}
1866 
1867 	err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1868 			 secy->key_len, secy->icv_len);
1869 	if (err < 0) {
1870 		kfree(tx_sa);
1871 		rtnl_unlock();
1872 		return err;
1873 	}
1874 
1875 	spin_lock_bh(&tx_sa->lock);
1876 	tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1877 	spin_unlock_bh(&tx_sa->lock);
1878 
1879 	if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1880 		tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1881 
1882 	was_operational = secy->operational;
1883 	if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1884 		secy->operational = true;
1885 
1886 	/* If h/w offloading is available, propagate to the device */
1887 	if (macsec_is_offloaded(netdev_priv(dev))) {
1888 		const struct macsec_ops *ops;
1889 		struct macsec_context ctx;
1890 
1891 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
1892 		if (!ops) {
1893 			err = -EOPNOTSUPP;
1894 			goto cleanup;
1895 		}
1896 
1897 		ctx.sa.assoc_num = assoc_num;
1898 		ctx.sa.tx_sa = tx_sa;
1899 		memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1900 		       MACSEC_KEYID_LEN);
1901 
1902 		err = macsec_offload(ops->mdo_add_txsa, &ctx);
1903 		if (err)
1904 			goto cleanup;
1905 	}
1906 
1907 	nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1908 	rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1909 
1910 	rtnl_unlock();
1911 
1912 	return 0;
1913 
1914 cleanup:
1915 	secy->operational = was_operational;
1916 	kfree(tx_sa);
1917 	rtnl_unlock();
1918 	return err;
1919 }
1920 
1921 static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1922 {
1923 	struct nlattr **attrs = info->attrs;
1924 	struct net_device *dev;
1925 	struct macsec_secy *secy;
1926 	struct macsec_rx_sc *rx_sc;
1927 	struct macsec_rx_sa *rx_sa;
1928 	u8 assoc_num;
1929 	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1930 	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1931 	int ret;
1932 
1933 	if (!attrs[MACSEC_ATTR_IFINDEX])
1934 		return -EINVAL;
1935 
1936 	if (parse_sa_config(attrs, tb_sa))
1937 		return -EINVAL;
1938 
1939 	if (parse_rxsc_config(attrs, tb_rxsc))
1940 		return -EINVAL;
1941 
1942 	rtnl_lock();
1943 	rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1944 				 &dev, &secy, &rx_sc, &assoc_num);
1945 	if (IS_ERR(rx_sa)) {
1946 		rtnl_unlock();
1947 		return PTR_ERR(rx_sa);
1948 	}
1949 
1950 	if (rx_sa->active) {
1951 		rtnl_unlock();
1952 		return -EBUSY;
1953 	}
1954 
1955 	/* If h/w offloading is available, propagate to the device */
1956 	if (macsec_is_offloaded(netdev_priv(dev))) {
1957 		const struct macsec_ops *ops;
1958 		struct macsec_context ctx;
1959 
1960 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
1961 		if (!ops) {
1962 			ret = -EOPNOTSUPP;
1963 			goto cleanup;
1964 		}
1965 
1966 		ctx.sa.assoc_num = assoc_num;
1967 		ctx.sa.rx_sa = rx_sa;
1968 
1969 		ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
1970 		if (ret)
1971 			goto cleanup;
1972 	}
1973 
1974 	RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1975 	clear_rx_sa(rx_sa);
1976 
1977 	rtnl_unlock();
1978 
1979 	return 0;
1980 
1981 cleanup:
1982 	rtnl_unlock();
1983 	return ret;
1984 }
1985 
1986 static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1987 {
1988 	struct nlattr **attrs = info->attrs;
1989 	struct net_device *dev;
1990 	struct macsec_secy *secy;
1991 	struct macsec_rx_sc *rx_sc;
1992 	sci_t sci;
1993 	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1994 	int ret;
1995 
1996 	if (!attrs[MACSEC_ATTR_IFINDEX])
1997 		return -EINVAL;
1998 
1999 	if (parse_rxsc_config(attrs, tb_rxsc))
2000 		return -EINVAL;
2001 
2002 	if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2003 		return -EINVAL;
2004 
2005 	rtnl_lock();
2006 	dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2007 	if (IS_ERR(dev)) {
2008 		rtnl_unlock();
2009 		return PTR_ERR(dev);
2010 	}
2011 
2012 	secy = &macsec_priv(dev)->secy;
2013 	sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2014 
2015 	rx_sc = del_rx_sc(secy, sci);
2016 	if (!rx_sc) {
2017 		rtnl_unlock();
2018 		return -ENODEV;
2019 	}
2020 
2021 	/* If h/w offloading is available, propagate to the device */
2022 	if (macsec_is_offloaded(netdev_priv(dev))) {
2023 		const struct macsec_ops *ops;
2024 		struct macsec_context ctx;
2025 
2026 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
2027 		if (!ops) {
2028 			ret = -EOPNOTSUPP;
2029 			goto cleanup;
2030 		}
2031 
2032 		ctx.rx_sc = rx_sc;
2033 		ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2034 		if (ret)
2035 			goto cleanup;
2036 	}
2037 
2038 	free_rx_sc(rx_sc);
2039 	rtnl_unlock();
2040 
2041 	return 0;
2042 
2043 cleanup:
2044 	rtnl_unlock();
2045 	return ret;
2046 }
2047 
2048 static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2049 {
2050 	struct nlattr **attrs = info->attrs;
2051 	struct net_device *dev;
2052 	struct macsec_secy *secy;
2053 	struct macsec_tx_sc *tx_sc;
2054 	struct macsec_tx_sa *tx_sa;
2055 	u8 assoc_num;
2056 	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2057 	int ret;
2058 
2059 	if (!attrs[MACSEC_ATTR_IFINDEX])
2060 		return -EINVAL;
2061 
2062 	if (parse_sa_config(attrs, tb_sa))
2063 		return -EINVAL;
2064 
2065 	rtnl_lock();
2066 	tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2067 				 &dev, &secy, &tx_sc, &assoc_num);
2068 	if (IS_ERR(tx_sa)) {
2069 		rtnl_unlock();
2070 		return PTR_ERR(tx_sa);
2071 	}
2072 
2073 	if (tx_sa->active) {
2074 		rtnl_unlock();
2075 		return -EBUSY;
2076 	}
2077 
2078 	/* If h/w offloading is available, propagate to the device */
2079 	if (macsec_is_offloaded(netdev_priv(dev))) {
2080 		const struct macsec_ops *ops;
2081 		struct macsec_context ctx;
2082 
2083 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
2084 		if (!ops) {
2085 			ret = -EOPNOTSUPP;
2086 			goto cleanup;
2087 		}
2088 
2089 		ctx.sa.assoc_num = assoc_num;
2090 		ctx.sa.tx_sa = tx_sa;
2091 
2092 		ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2093 		if (ret)
2094 			goto cleanup;
2095 	}
2096 
2097 	RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2098 	clear_tx_sa(tx_sa);
2099 
2100 	rtnl_unlock();
2101 
2102 	return 0;
2103 
2104 cleanup:
2105 	rtnl_unlock();
2106 	return ret;
2107 }
2108 
2109 static bool validate_upd_sa(struct nlattr **attrs)
2110 {
2111 	if (!attrs[MACSEC_SA_ATTR_AN] ||
2112 	    attrs[MACSEC_SA_ATTR_KEY] ||
2113 	    attrs[MACSEC_SA_ATTR_KEYID])
2114 		return false;
2115 
2116 	if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2117 		return false;
2118 
2119 	if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2120 		return false;
2121 
2122 	if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2123 		if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2124 			return false;
2125 	}
2126 
2127 	return true;
2128 }
2129 
2130 static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2131 {
2132 	struct nlattr **attrs = info->attrs;
2133 	struct net_device *dev;
2134 	struct macsec_secy *secy;
2135 	struct macsec_tx_sc *tx_sc;
2136 	struct macsec_tx_sa *tx_sa;
2137 	u8 assoc_num;
2138 	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2139 	bool was_operational, was_active;
2140 	u32 prev_pn = 0;
2141 	int ret = 0;
2142 
2143 	if (!attrs[MACSEC_ATTR_IFINDEX])
2144 		return -EINVAL;
2145 
2146 	if (parse_sa_config(attrs, tb_sa))
2147 		return -EINVAL;
2148 
2149 	if (!validate_upd_sa(tb_sa))
2150 		return -EINVAL;
2151 
2152 	rtnl_lock();
2153 	tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2154 				 &dev, &secy, &tx_sc, &assoc_num);
2155 	if (IS_ERR(tx_sa)) {
2156 		rtnl_unlock();
2157 		return PTR_ERR(tx_sa);
2158 	}
2159 
2160 	if (tb_sa[MACSEC_SA_ATTR_PN]) {
2161 		spin_lock_bh(&tx_sa->lock);
2162 		prev_pn = tx_sa->next_pn;
2163 		tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2164 		spin_unlock_bh(&tx_sa->lock);
2165 	}
2166 
2167 	was_active = tx_sa->active;
2168 	if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2169 		tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2170 
2171 	was_operational = secy->operational;
2172 	if (assoc_num == tx_sc->encoding_sa)
2173 		secy->operational = tx_sa->active;
2174 
2175 	/* If h/w offloading is available, propagate to the device */
2176 	if (macsec_is_offloaded(netdev_priv(dev))) {
2177 		const struct macsec_ops *ops;
2178 		struct macsec_context ctx;
2179 
2180 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
2181 		if (!ops) {
2182 			ret = -EOPNOTSUPP;
2183 			goto cleanup;
2184 		}
2185 
2186 		ctx.sa.assoc_num = assoc_num;
2187 		ctx.sa.tx_sa = tx_sa;
2188 
2189 		ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2190 		if (ret)
2191 			goto cleanup;
2192 	}
2193 
2194 	rtnl_unlock();
2195 
2196 	return 0;
2197 
2198 cleanup:
2199 	if (tb_sa[MACSEC_SA_ATTR_PN]) {
2200 		spin_lock_bh(&tx_sa->lock);
2201 		tx_sa->next_pn = prev_pn;
2202 		spin_unlock_bh(&tx_sa->lock);
2203 	}
2204 	tx_sa->active = was_active;
2205 	secy->operational = was_operational;
2206 	rtnl_unlock();
2207 	return ret;
2208 }
2209 
2210 static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2211 {
2212 	struct nlattr **attrs = info->attrs;
2213 	struct net_device *dev;
2214 	struct macsec_secy *secy;
2215 	struct macsec_rx_sc *rx_sc;
2216 	struct macsec_rx_sa *rx_sa;
2217 	u8 assoc_num;
2218 	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2219 	struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2220 	bool was_active;
2221 	u32 prev_pn = 0;
2222 	int ret = 0;
2223 
2224 	if (!attrs[MACSEC_ATTR_IFINDEX])
2225 		return -EINVAL;
2226 
2227 	if (parse_rxsc_config(attrs, tb_rxsc))
2228 		return -EINVAL;
2229 
2230 	if (parse_sa_config(attrs, tb_sa))
2231 		return -EINVAL;
2232 
2233 	if (!validate_upd_sa(tb_sa))
2234 		return -EINVAL;
2235 
2236 	rtnl_lock();
2237 	rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2238 				 &dev, &secy, &rx_sc, &assoc_num);
2239 	if (IS_ERR(rx_sa)) {
2240 		rtnl_unlock();
2241 		return PTR_ERR(rx_sa);
2242 	}
2243 
2244 	if (tb_sa[MACSEC_SA_ATTR_PN]) {
2245 		spin_lock_bh(&rx_sa->lock);
2246 		prev_pn = rx_sa->next_pn;
2247 		rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2248 		spin_unlock_bh(&rx_sa->lock);
2249 	}
2250 
2251 	was_active = rx_sa->active;
2252 	if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2253 		rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2254 
2255 	/* If h/w offloading is available, propagate to the device */
2256 	if (macsec_is_offloaded(netdev_priv(dev))) {
2257 		const struct macsec_ops *ops;
2258 		struct macsec_context ctx;
2259 
2260 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
2261 		if (!ops) {
2262 			ret = -EOPNOTSUPP;
2263 			goto cleanup;
2264 		}
2265 
2266 		ctx.sa.assoc_num = assoc_num;
2267 		ctx.sa.rx_sa = rx_sa;
2268 
2269 		ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2270 		if (ret)
2271 			goto cleanup;
2272 	}
2273 
2274 	rtnl_unlock();
2275 	return 0;
2276 
2277 cleanup:
2278 	if (tb_sa[MACSEC_SA_ATTR_PN]) {
2279 		spin_lock_bh(&rx_sa->lock);
2280 		rx_sa->next_pn = prev_pn;
2281 		spin_unlock_bh(&rx_sa->lock);
2282 	}
2283 	rx_sa->active = was_active;
2284 	rtnl_unlock();
2285 	return ret;
2286 }
2287 
2288 static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2289 {
2290 	struct nlattr **attrs = info->attrs;
2291 	struct net_device *dev;
2292 	struct macsec_secy *secy;
2293 	struct macsec_rx_sc *rx_sc;
2294 	struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2295 	unsigned int prev_n_rx_sc;
2296 	bool was_active;
2297 	int ret;
2298 
2299 	if (!attrs[MACSEC_ATTR_IFINDEX])
2300 		return -EINVAL;
2301 
2302 	if (parse_rxsc_config(attrs, tb_rxsc))
2303 		return -EINVAL;
2304 
2305 	if (!validate_add_rxsc(tb_rxsc))
2306 		return -EINVAL;
2307 
2308 	rtnl_lock();
2309 	rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2310 	if (IS_ERR(rx_sc)) {
2311 		rtnl_unlock();
2312 		return PTR_ERR(rx_sc);
2313 	}
2314 
2315 	was_active = rx_sc->active;
2316 	prev_n_rx_sc = secy->n_rx_sc;
2317 	if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2318 		bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2319 
2320 		if (rx_sc->active != new)
2321 			secy->n_rx_sc += new ? 1 : -1;
2322 
2323 		rx_sc->active = new;
2324 	}
2325 
2326 	/* If h/w offloading is available, propagate to the device */
2327 	if (macsec_is_offloaded(netdev_priv(dev))) {
2328 		const struct macsec_ops *ops;
2329 		struct macsec_context ctx;
2330 
2331 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
2332 		if (!ops) {
2333 			ret = -EOPNOTSUPP;
2334 			goto cleanup;
2335 		}
2336 
2337 		ctx.rx_sc = rx_sc;
2338 
2339 		ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2340 		if (ret)
2341 			goto cleanup;
2342 	}
2343 
2344 	rtnl_unlock();
2345 
2346 	return 0;
2347 
2348 cleanup:
2349 	secy->n_rx_sc = prev_n_rx_sc;
2350 	rx_sc->active = was_active;
2351 	rtnl_unlock();
2352 	return ret;
2353 }
2354 
2355 static bool macsec_is_configured(struct macsec_dev *macsec)
2356 {
2357 	struct macsec_secy *secy = &macsec->secy;
2358 	struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2359 	int i;
2360 
2361 	if (secy->n_rx_sc > 0)
2362 		return true;
2363 
2364 	for (i = 0; i < MACSEC_NUM_AN; i++)
2365 		if (tx_sc->sa[i])
2366 			return true;
2367 
2368 	return false;
2369 }
2370 
2371 static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2372 {
2373 	struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2374 	enum macsec_offload offload, prev_offload;
2375 	int (*func)(struct macsec_context *ctx);
2376 	struct nlattr **attrs = info->attrs;
2377 	struct net_device *dev, *loop_dev;
2378 	const struct macsec_ops *ops;
2379 	struct macsec_context ctx;
2380 	struct macsec_dev *macsec;
2381 	struct net *loop_net;
2382 	int ret;
2383 
2384 	if (!attrs[MACSEC_ATTR_IFINDEX])
2385 		return -EINVAL;
2386 
2387 	if (!attrs[MACSEC_ATTR_OFFLOAD])
2388 		return -EINVAL;
2389 
2390 	if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2391 					attrs[MACSEC_ATTR_OFFLOAD],
2392 					macsec_genl_offload_policy, NULL))
2393 		return -EINVAL;
2394 
2395 	dev = get_dev_from_nl(genl_info_net(info), attrs);
2396 	if (IS_ERR(dev))
2397 		return PTR_ERR(dev);
2398 	macsec = macsec_priv(dev);
2399 
2400 	offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2401 	if (macsec->offload == offload)
2402 		return 0;
2403 
2404 	/* Check if the offloading mode is supported by the underlying layers */
2405 	if (offload != MACSEC_OFFLOAD_OFF &&
2406 	    !macsec_check_offload(offload, macsec))
2407 		return -EOPNOTSUPP;
2408 
2409 	if (offload == MACSEC_OFFLOAD_OFF)
2410 		goto skip_limitation;
2411 
2412 	/* Check the physical interface isn't offloading another interface
2413 	 * first.
2414 	 */
2415 	for_each_net(loop_net) {
2416 		for_each_netdev(loop_net, loop_dev) {
2417 			struct macsec_dev *priv;
2418 
2419 			if (!netif_is_macsec(loop_dev))
2420 				continue;
2421 
2422 			priv = macsec_priv(loop_dev);
2423 
2424 			if (priv->real_dev == macsec->real_dev &&
2425 			    priv->offload != MACSEC_OFFLOAD_OFF)
2426 				return -EBUSY;
2427 		}
2428 	}
2429 
2430 skip_limitation:
2431 	/* Check if the net device is busy. */
2432 	if (netif_running(dev))
2433 		return -EBUSY;
2434 
2435 	rtnl_lock();
2436 
2437 	prev_offload = macsec->offload;
2438 	macsec->offload = offload;
2439 
2440 	/* Check if the device already has rules configured: we do not support
2441 	 * rules migration.
2442 	 */
2443 	if (macsec_is_configured(macsec)) {
2444 		ret = -EBUSY;
2445 		goto rollback;
2446 	}
2447 
2448 	ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2449 			       macsec, &ctx);
2450 	if (!ops) {
2451 		ret = -EOPNOTSUPP;
2452 		goto rollback;
2453 	}
2454 
2455 	if (prev_offload == MACSEC_OFFLOAD_OFF)
2456 		func = ops->mdo_add_secy;
2457 	else
2458 		func = ops->mdo_del_secy;
2459 
2460 	ctx.secy = &macsec->secy;
2461 	ret = macsec_offload(func, &ctx);
2462 	if (ret)
2463 		goto rollback;
2464 
2465 	rtnl_unlock();
2466 	return 0;
2467 
2468 rollback:
2469 	macsec->offload = prev_offload;
2470 
2471 	rtnl_unlock();
2472 	return ret;
2473 }
2474 
2475 static int copy_tx_sa_stats(struct sk_buff *skb,
2476 			    struct macsec_tx_sa_stats __percpu *pstats)
2477 {
2478 	struct macsec_tx_sa_stats sum = {0, };
2479 	int cpu;
2480 
2481 	for_each_possible_cpu(cpu) {
2482 		const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2483 
2484 		sum.OutPktsProtected += stats->OutPktsProtected;
2485 		sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2486 	}
2487 
2488 	if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2489 	    nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2490 		return -EMSGSIZE;
2491 
2492 	return 0;
2493 }
2494 
2495 static noinline_for_stack int
2496 copy_rx_sa_stats(struct sk_buff *skb,
2497 		 struct macsec_rx_sa_stats __percpu *pstats)
2498 {
2499 	struct macsec_rx_sa_stats sum = {0, };
2500 	int cpu;
2501 
2502 	for_each_possible_cpu(cpu) {
2503 		const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2504 
2505 		sum.InPktsOK         += stats->InPktsOK;
2506 		sum.InPktsInvalid    += stats->InPktsInvalid;
2507 		sum.InPktsNotValid   += stats->InPktsNotValid;
2508 		sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2509 		sum.InPktsUnusedSA   += stats->InPktsUnusedSA;
2510 	}
2511 
2512 	if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2513 	    nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2514 	    nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2515 	    nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2516 	    nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2517 		return -EMSGSIZE;
2518 
2519 	return 0;
2520 }
2521 
2522 static noinline_for_stack int
2523 copy_rx_sc_stats(struct sk_buff *skb, struct pcpu_rx_sc_stats __percpu *pstats)
2524 {
2525 	struct macsec_rx_sc_stats sum = {0, };
2526 	int cpu;
2527 
2528 	for_each_possible_cpu(cpu) {
2529 		const struct pcpu_rx_sc_stats *stats;
2530 		struct macsec_rx_sc_stats tmp;
2531 		unsigned int start;
2532 
2533 		stats = per_cpu_ptr(pstats, cpu);
2534 		do {
2535 			start = u64_stats_fetch_begin_irq(&stats->syncp);
2536 			memcpy(&tmp, &stats->stats, sizeof(tmp));
2537 		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2538 
2539 		sum.InOctetsValidated += tmp.InOctetsValidated;
2540 		sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2541 		sum.InPktsUnchecked   += tmp.InPktsUnchecked;
2542 		sum.InPktsDelayed     += tmp.InPktsDelayed;
2543 		sum.InPktsOK          += tmp.InPktsOK;
2544 		sum.InPktsInvalid     += tmp.InPktsInvalid;
2545 		sum.InPktsLate        += tmp.InPktsLate;
2546 		sum.InPktsNotValid    += tmp.InPktsNotValid;
2547 		sum.InPktsNotUsingSA  += tmp.InPktsNotUsingSA;
2548 		sum.InPktsUnusedSA    += tmp.InPktsUnusedSA;
2549 	}
2550 
2551 	if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2552 			      sum.InOctetsValidated,
2553 			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2554 	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2555 			      sum.InOctetsDecrypted,
2556 			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2557 	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2558 			      sum.InPktsUnchecked,
2559 			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2560 	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2561 			      sum.InPktsDelayed,
2562 			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2563 	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2564 			      sum.InPktsOK,
2565 			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2566 	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2567 			      sum.InPktsInvalid,
2568 			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2569 	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2570 			      sum.InPktsLate,
2571 			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2572 	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2573 			      sum.InPktsNotValid,
2574 			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2575 	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2576 			      sum.InPktsNotUsingSA,
2577 			      MACSEC_RXSC_STATS_ATTR_PAD) ||
2578 	    nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2579 			      sum.InPktsUnusedSA,
2580 			      MACSEC_RXSC_STATS_ATTR_PAD))
2581 		return -EMSGSIZE;
2582 
2583 	return 0;
2584 }
2585 
2586 static noinline_for_stack int
2587 copy_tx_sc_stats(struct sk_buff *skb, struct pcpu_tx_sc_stats __percpu *pstats)
2588 {
2589 	struct macsec_tx_sc_stats sum = {0, };
2590 	int cpu;
2591 
2592 	for_each_possible_cpu(cpu) {
2593 		const struct pcpu_tx_sc_stats *stats;
2594 		struct macsec_tx_sc_stats tmp;
2595 		unsigned int start;
2596 
2597 		stats = per_cpu_ptr(pstats, cpu);
2598 		do {
2599 			start = u64_stats_fetch_begin_irq(&stats->syncp);
2600 			memcpy(&tmp, &stats->stats, sizeof(tmp));
2601 		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2602 
2603 		sum.OutPktsProtected   += tmp.OutPktsProtected;
2604 		sum.OutPktsEncrypted   += tmp.OutPktsEncrypted;
2605 		sum.OutOctetsProtected += tmp.OutOctetsProtected;
2606 		sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2607 	}
2608 
2609 	if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2610 			      sum.OutPktsProtected,
2611 			      MACSEC_TXSC_STATS_ATTR_PAD) ||
2612 	    nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2613 			      sum.OutPktsEncrypted,
2614 			      MACSEC_TXSC_STATS_ATTR_PAD) ||
2615 	    nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2616 			      sum.OutOctetsProtected,
2617 			      MACSEC_TXSC_STATS_ATTR_PAD) ||
2618 	    nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2619 			      sum.OutOctetsEncrypted,
2620 			      MACSEC_TXSC_STATS_ATTR_PAD))
2621 		return -EMSGSIZE;
2622 
2623 	return 0;
2624 }
2625 
2626 static noinline_for_stack int
2627 copy_secy_stats(struct sk_buff *skb, struct pcpu_secy_stats __percpu *pstats)
2628 {
2629 	struct macsec_dev_stats sum = {0, };
2630 	int cpu;
2631 
2632 	for_each_possible_cpu(cpu) {
2633 		const struct pcpu_secy_stats *stats;
2634 		struct macsec_dev_stats tmp;
2635 		unsigned int start;
2636 
2637 		stats = per_cpu_ptr(pstats, cpu);
2638 		do {
2639 			start = u64_stats_fetch_begin_irq(&stats->syncp);
2640 			memcpy(&tmp, &stats->stats, sizeof(tmp));
2641 		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2642 
2643 		sum.OutPktsUntagged  += tmp.OutPktsUntagged;
2644 		sum.InPktsUntagged   += tmp.InPktsUntagged;
2645 		sum.OutPktsTooLong   += tmp.OutPktsTooLong;
2646 		sum.InPktsNoTag      += tmp.InPktsNoTag;
2647 		sum.InPktsBadTag     += tmp.InPktsBadTag;
2648 		sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2649 		sum.InPktsNoSCI      += tmp.InPktsNoSCI;
2650 		sum.InPktsOverrun    += tmp.InPktsOverrun;
2651 	}
2652 
2653 	if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2654 			      sum.OutPktsUntagged,
2655 			      MACSEC_SECY_STATS_ATTR_PAD) ||
2656 	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2657 			      sum.InPktsUntagged,
2658 			      MACSEC_SECY_STATS_ATTR_PAD) ||
2659 	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2660 			      sum.OutPktsTooLong,
2661 			      MACSEC_SECY_STATS_ATTR_PAD) ||
2662 	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2663 			      sum.InPktsNoTag,
2664 			      MACSEC_SECY_STATS_ATTR_PAD) ||
2665 	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2666 			      sum.InPktsBadTag,
2667 			      MACSEC_SECY_STATS_ATTR_PAD) ||
2668 	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2669 			      sum.InPktsUnknownSCI,
2670 			      MACSEC_SECY_STATS_ATTR_PAD) ||
2671 	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2672 			      sum.InPktsNoSCI,
2673 			      MACSEC_SECY_STATS_ATTR_PAD) ||
2674 	    nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2675 			      sum.InPktsOverrun,
2676 			      MACSEC_SECY_STATS_ATTR_PAD))
2677 		return -EMSGSIZE;
2678 
2679 	return 0;
2680 }
2681 
2682 static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2683 {
2684 	struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2685 	struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2686 							 MACSEC_ATTR_SECY);
2687 	u64 csid;
2688 
2689 	if (!secy_nest)
2690 		return 1;
2691 
2692 	switch (secy->key_len) {
2693 	case MACSEC_GCM_AES_128_SAK_LEN:
2694 		csid = MACSEC_DEFAULT_CIPHER_ID;
2695 		break;
2696 	case MACSEC_GCM_AES_256_SAK_LEN:
2697 		csid = MACSEC_CIPHER_ID_GCM_AES_256;
2698 		break;
2699 	default:
2700 		goto cancel;
2701 	}
2702 
2703 	if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2704 			MACSEC_SECY_ATTR_PAD) ||
2705 	    nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2706 			      csid, MACSEC_SECY_ATTR_PAD) ||
2707 	    nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2708 	    nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2709 	    nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2710 	    nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2711 	    nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2712 	    nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2713 	    nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2714 	    nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2715 	    nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2716 	    nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2717 		goto cancel;
2718 
2719 	if (secy->replay_protect) {
2720 		if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2721 			goto cancel;
2722 	}
2723 
2724 	nla_nest_end(skb, secy_nest);
2725 	return 0;
2726 
2727 cancel:
2728 	nla_nest_cancel(skb, secy_nest);
2729 	return 1;
2730 }
2731 
2732 static noinline_for_stack int
2733 dump_secy(struct macsec_secy *secy, struct net_device *dev,
2734 	  struct sk_buff *skb, struct netlink_callback *cb)
2735 {
2736 	struct macsec_dev *macsec = netdev_priv(dev);
2737 	struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2738 	struct nlattr *txsa_list, *rxsc_list;
2739 	struct macsec_rx_sc *rx_sc;
2740 	struct nlattr *attr;
2741 	void *hdr;
2742 	int i, j;
2743 
2744 	hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2745 			  &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2746 	if (!hdr)
2747 		return -EMSGSIZE;
2748 
2749 	genl_dump_check_consistent(cb, hdr);
2750 
2751 	if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2752 		goto nla_put_failure;
2753 
2754 	attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
2755 	if (!attr)
2756 		goto nla_put_failure;
2757 	if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
2758 		goto nla_put_failure;
2759 	nla_nest_end(skb, attr);
2760 
2761 	if (nla_put_secy(secy, skb))
2762 		goto nla_put_failure;
2763 
2764 	attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
2765 	if (!attr)
2766 		goto nla_put_failure;
2767 	if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2768 		nla_nest_cancel(skb, attr);
2769 		goto nla_put_failure;
2770 	}
2771 	nla_nest_end(skb, attr);
2772 
2773 	attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
2774 	if (!attr)
2775 		goto nla_put_failure;
2776 	if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2777 		nla_nest_cancel(skb, attr);
2778 		goto nla_put_failure;
2779 	}
2780 	nla_nest_end(skb, attr);
2781 
2782 	txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
2783 	if (!txsa_list)
2784 		goto nla_put_failure;
2785 	for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2786 		struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2787 		struct nlattr *txsa_nest;
2788 
2789 		if (!tx_sa)
2790 			continue;
2791 
2792 		txsa_nest = nla_nest_start_noflag(skb, j++);
2793 		if (!txsa_nest) {
2794 			nla_nest_cancel(skb, txsa_list);
2795 			goto nla_put_failure;
2796 		}
2797 
2798 		if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2799 		    nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2800 		    nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2801 		    nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2802 			nla_nest_cancel(skb, txsa_nest);
2803 			nla_nest_cancel(skb, txsa_list);
2804 			goto nla_put_failure;
2805 		}
2806 
2807 		attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
2808 		if (!attr) {
2809 			nla_nest_cancel(skb, txsa_nest);
2810 			nla_nest_cancel(skb, txsa_list);
2811 			goto nla_put_failure;
2812 		}
2813 		if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2814 			nla_nest_cancel(skb, attr);
2815 			nla_nest_cancel(skb, txsa_nest);
2816 			nla_nest_cancel(skb, txsa_list);
2817 			goto nla_put_failure;
2818 		}
2819 		nla_nest_end(skb, attr);
2820 
2821 		nla_nest_end(skb, txsa_nest);
2822 	}
2823 	nla_nest_end(skb, txsa_list);
2824 
2825 	rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
2826 	if (!rxsc_list)
2827 		goto nla_put_failure;
2828 
2829 	j = 1;
2830 	for_each_rxsc_rtnl(secy, rx_sc) {
2831 		int k;
2832 		struct nlattr *rxsa_list;
2833 		struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
2834 
2835 		if (!rxsc_nest) {
2836 			nla_nest_cancel(skb, rxsc_list);
2837 			goto nla_put_failure;
2838 		}
2839 
2840 		if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2841 		    nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2842 				MACSEC_RXSC_ATTR_PAD)) {
2843 			nla_nest_cancel(skb, rxsc_nest);
2844 			nla_nest_cancel(skb, rxsc_list);
2845 			goto nla_put_failure;
2846 		}
2847 
2848 		attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
2849 		if (!attr) {
2850 			nla_nest_cancel(skb, rxsc_nest);
2851 			nla_nest_cancel(skb, rxsc_list);
2852 			goto nla_put_failure;
2853 		}
2854 		if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2855 			nla_nest_cancel(skb, attr);
2856 			nla_nest_cancel(skb, rxsc_nest);
2857 			nla_nest_cancel(skb, rxsc_list);
2858 			goto nla_put_failure;
2859 		}
2860 		nla_nest_end(skb, attr);
2861 
2862 		rxsa_list = nla_nest_start_noflag(skb,
2863 						  MACSEC_RXSC_ATTR_SA_LIST);
2864 		if (!rxsa_list) {
2865 			nla_nest_cancel(skb, rxsc_nest);
2866 			nla_nest_cancel(skb, rxsc_list);
2867 			goto nla_put_failure;
2868 		}
2869 
2870 		for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2871 			struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2872 			struct nlattr *rxsa_nest;
2873 
2874 			if (!rx_sa)
2875 				continue;
2876 
2877 			rxsa_nest = nla_nest_start_noflag(skb, k++);
2878 			if (!rxsa_nest) {
2879 				nla_nest_cancel(skb, rxsa_list);
2880 				nla_nest_cancel(skb, rxsc_nest);
2881 				nla_nest_cancel(skb, rxsc_list);
2882 				goto nla_put_failure;
2883 			}
2884 
2885 			attr = nla_nest_start_noflag(skb,
2886 						     MACSEC_SA_ATTR_STATS);
2887 			if (!attr) {
2888 				nla_nest_cancel(skb, rxsa_list);
2889 				nla_nest_cancel(skb, rxsc_nest);
2890 				nla_nest_cancel(skb, rxsc_list);
2891 				goto nla_put_failure;
2892 			}
2893 			if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2894 				nla_nest_cancel(skb, attr);
2895 				nla_nest_cancel(skb, rxsa_list);
2896 				nla_nest_cancel(skb, rxsc_nest);
2897 				nla_nest_cancel(skb, rxsc_list);
2898 				goto nla_put_failure;
2899 			}
2900 			nla_nest_end(skb, attr);
2901 
2902 			if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2903 			    nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2904 			    nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2905 			    nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2906 				nla_nest_cancel(skb, rxsa_nest);
2907 				nla_nest_cancel(skb, rxsc_nest);
2908 				nla_nest_cancel(skb, rxsc_list);
2909 				goto nla_put_failure;
2910 			}
2911 			nla_nest_end(skb, rxsa_nest);
2912 		}
2913 
2914 		nla_nest_end(skb, rxsa_list);
2915 		nla_nest_end(skb, rxsc_nest);
2916 	}
2917 
2918 	nla_nest_end(skb, rxsc_list);
2919 
2920 	genlmsg_end(skb, hdr);
2921 
2922 	return 0;
2923 
2924 nla_put_failure:
2925 	genlmsg_cancel(skb, hdr);
2926 	return -EMSGSIZE;
2927 }
2928 
2929 static int macsec_generation = 1; /* protected by RTNL */
2930 
2931 static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2932 {
2933 	struct net *net = sock_net(skb->sk);
2934 	struct net_device *dev;
2935 	int dev_idx, d;
2936 
2937 	dev_idx = cb->args[0];
2938 
2939 	d = 0;
2940 	rtnl_lock();
2941 
2942 	cb->seq = macsec_generation;
2943 
2944 	for_each_netdev(net, dev) {
2945 		struct macsec_secy *secy;
2946 
2947 		if (d < dev_idx)
2948 			goto next;
2949 
2950 		if (!netif_is_macsec(dev))
2951 			goto next;
2952 
2953 		secy = &macsec_priv(dev)->secy;
2954 		if (dump_secy(secy, dev, skb, cb) < 0)
2955 			goto done;
2956 next:
2957 		d++;
2958 	}
2959 
2960 done:
2961 	rtnl_unlock();
2962 	cb->args[0] = d;
2963 	return skb->len;
2964 }
2965 
2966 static const struct genl_ops macsec_genl_ops[] = {
2967 	{
2968 		.cmd = MACSEC_CMD_GET_TXSC,
2969 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2970 		.dumpit = macsec_dump_txsc,
2971 	},
2972 	{
2973 		.cmd = MACSEC_CMD_ADD_RXSC,
2974 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2975 		.doit = macsec_add_rxsc,
2976 		.flags = GENL_ADMIN_PERM,
2977 	},
2978 	{
2979 		.cmd = MACSEC_CMD_DEL_RXSC,
2980 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2981 		.doit = macsec_del_rxsc,
2982 		.flags = GENL_ADMIN_PERM,
2983 	},
2984 	{
2985 		.cmd = MACSEC_CMD_UPD_RXSC,
2986 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2987 		.doit = macsec_upd_rxsc,
2988 		.flags = GENL_ADMIN_PERM,
2989 	},
2990 	{
2991 		.cmd = MACSEC_CMD_ADD_TXSA,
2992 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2993 		.doit = macsec_add_txsa,
2994 		.flags = GENL_ADMIN_PERM,
2995 	},
2996 	{
2997 		.cmd = MACSEC_CMD_DEL_TXSA,
2998 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2999 		.doit = macsec_del_txsa,
3000 		.flags = GENL_ADMIN_PERM,
3001 	},
3002 	{
3003 		.cmd = MACSEC_CMD_UPD_TXSA,
3004 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3005 		.doit = macsec_upd_txsa,
3006 		.flags = GENL_ADMIN_PERM,
3007 	},
3008 	{
3009 		.cmd = MACSEC_CMD_ADD_RXSA,
3010 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3011 		.doit = macsec_add_rxsa,
3012 		.flags = GENL_ADMIN_PERM,
3013 	},
3014 	{
3015 		.cmd = MACSEC_CMD_DEL_RXSA,
3016 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3017 		.doit = macsec_del_rxsa,
3018 		.flags = GENL_ADMIN_PERM,
3019 	},
3020 	{
3021 		.cmd = MACSEC_CMD_UPD_RXSA,
3022 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3023 		.doit = macsec_upd_rxsa,
3024 		.flags = GENL_ADMIN_PERM,
3025 	},
3026 	{
3027 		.cmd = MACSEC_CMD_UPD_OFFLOAD,
3028 		.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3029 		.doit = macsec_upd_offload,
3030 		.flags = GENL_ADMIN_PERM,
3031 	},
3032 };
3033 
3034 static struct genl_family macsec_fam __ro_after_init = {
3035 	.name		= MACSEC_GENL_NAME,
3036 	.hdrsize	= 0,
3037 	.version	= MACSEC_GENL_VERSION,
3038 	.maxattr	= MACSEC_ATTR_MAX,
3039 	.policy = macsec_genl_policy,
3040 	.netnsok	= true,
3041 	.module		= THIS_MODULE,
3042 	.ops		= macsec_genl_ops,
3043 	.n_ops		= ARRAY_SIZE(macsec_genl_ops),
3044 };
3045 
3046 static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3047 				     struct net_device *dev)
3048 {
3049 	struct macsec_dev *macsec = netdev_priv(dev);
3050 	struct macsec_secy *secy = &macsec->secy;
3051 	struct pcpu_secy_stats *secy_stats;
3052 	int ret, len;
3053 
3054 	if (macsec_is_offloaded(netdev_priv(dev))) {
3055 		skb->dev = macsec->real_dev;
3056 		return dev_queue_xmit(skb);
3057 	}
3058 
3059 	/* 10.5 */
3060 	if (!secy->protect_frames) {
3061 		secy_stats = this_cpu_ptr(macsec->stats);
3062 		u64_stats_update_begin(&secy_stats->syncp);
3063 		secy_stats->stats.OutPktsUntagged++;
3064 		u64_stats_update_end(&secy_stats->syncp);
3065 		skb->dev = macsec->real_dev;
3066 		len = skb->len;
3067 		ret = dev_queue_xmit(skb);
3068 		count_tx(dev, ret, len);
3069 		return ret;
3070 	}
3071 
3072 	if (!secy->operational) {
3073 		kfree_skb(skb);
3074 		dev->stats.tx_dropped++;
3075 		return NETDEV_TX_OK;
3076 	}
3077 
3078 	skb = macsec_encrypt(skb, dev);
3079 	if (IS_ERR(skb)) {
3080 		if (PTR_ERR(skb) != -EINPROGRESS)
3081 			dev->stats.tx_dropped++;
3082 		return NETDEV_TX_OK;
3083 	}
3084 
3085 	macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3086 
3087 	macsec_encrypt_finish(skb, dev);
3088 	len = skb->len;
3089 	ret = dev_queue_xmit(skb);
3090 	count_tx(dev, ret, len);
3091 	return ret;
3092 }
3093 
3094 #define MACSEC_FEATURES \
3095 	(NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3096 
3097 static int macsec_dev_init(struct net_device *dev)
3098 {
3099 	struct macsec_dev *macsec = macsec_priv(dev);
3100 	struct net_device *real_dev = macsec->real_dev;
3101 	int err;
3102 
3103 	dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3104 	if (!dev->tstats)
3105 		return -ENOMEM;
3106 
3107 	err = gro_cells_init(&macsec->gro_cells, dev);
3108 	if (err) {
3109 		free_percpu(dev->tstats);
3110 		return err;
3111 	}
3112 
3113 	dev->features = real_dev->features & MACSEC_FEATURES;
3114 	dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3115 
3116 	dev->needed_headroom = real_dev->needed_headroom +
3117 			       MACSEC_NEEDED_HEADROOM;
3118 	dev->needed_tailroom = real_dev->needed_tailroom +
3119 			       MACSEC_NEEDED_TAILROOM;
3120 
3121 	if (is_zero_ether_addr(dev->dev_addr))
3122 		eth_hw_addr_inherit(dev, real_dev);
3123 	if (is_zero_ether_addr(dev->broadcast))
3124 		memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3125 
3126 	return 0;
3127 }
3128 
3129 static void macsec_dev_uninit(struct net_device *dev)
3130 {
3131 	struct macsec_dev *macsec = macsec_priv(dev);
3132 
3133 	gro_cells_destroy(&macsec->gro_cells);
3134 	free_percpu(dev->tstats);
3135 }
3136 
3137 static netdev_features_t macsec_fix_features(struct net_device *dev,
3138 					     netdev_features_t features)
3139 {
3140 	struct macsec_dev *macsec = macsec_priv(dev);
3141 	struct net_device *real_dev = macsec->real_dev;
3142 
3143 	features &= (real_dev->features & MACSEC_FEATURES) |
3144 		    NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3145 	features |= NETIF_F_LLTX;
3146 
3147 	return features;
3148 }
3149 
3150 static int macsec_dev_open(struct net_device *dev)
3151 {
3152 	struct macsec_dev *macsec = macsec_priv(dev);
3153 	struct net_device *real_dev = macsec->real_dev;
3154 	int err;
3155 
3156 	err = dev_uc_add(real_dev, dev->dev_addr);
3157 	if (err < 0)
3158 		return err;
3159 
3160 	if (dev->flags & IFF_ALLMULTI) {
3161 		err = dev_set_allmulti(real_dev, 1);
3162 		if (err < 0)
3163 			goto del_unicast;
3164 	}
3165 
3166 	if (dev->flags & IFF_PROMISC) {
3167 		err = dev_set_promiscuity(real_dev, 1);
3168 		if (err < 0)
3169 			goto clear_allmulti;
3170 	}
3171 
3172 	/* If h/w offloading is available, propagate to the device */
3173 	if (macsec_is_offloaded(macsec)) {
3174 		const struct macsec_ops *ops;
3175 		struct macsec_context ctx;
3176 
3177 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
3178 		if (!ops) {
3179 			err = -EOPNOTSUPP;
3180 			goto clear_allmulti;
3181 		}
3182 
3183 		err = macsec_offload(ops->mdo_dev_open, &ctx);
3184 		if (err)
3185 			goto clear_allmulti;
3186 	}
3187 
3188 	if (netif_carrier_ok(real_dev))
3189 		netif_carrier_on(dev);
3190 
3191 	return 0;
3192 clear_allmulti:
3193 	if (dev->flags & IFF_ALLMULTI)
3194 		dev_set_allmulti(real_dev, -1);
3195 del_unicast:
3196 	dev_uc_del(real_dev, dev->dev_addr);
3197 	netif_carrier_off(dev);
3198 	return err;
3199 }
3200 
3201 static int macsec_dev_stop(struct net_device *dev)
3202 {
3203 	struct macsec_dev *macsec = macsec_priv(dev);
3204 	struct net_device *real_dev = macsec->real_dev;
3205 
3206 	netif_carrier_off(dev);
3207 
3208 	/* If h/w offloading is available, propagate to the device */
3209 	if (macsec_is_offloaded(macsec)) {
3210 		const struct macsec_ops *ops;
3211 		struct macsec_context ctx;
3212 
3213 		ops = macsec_get_ops(macsec, &ctx);
3214 		if (ops)
3215 			macsec_offload(ops->mdo_dev_stop, &ctx);
3216 	}
3217 
3218 	dev_mc_unsync(real_dev, dev);
3219 	dev_uc_unsync(real_dev, dev);
3220 
3221 	if (dev->flags & IFF_ALLMULTI)
3222 		dev_set_allmulti(real_dev, -1);
3223 
3224 	if (dev->flags & IFF_PROMISC)
3225 		dev_set_promiscuity(real_dev, -1);
3226 
3227 	dev_uc_del(real_dev, dev->dev_addr);
3228 
3229 	return 0;
3230 }
3231 
3232 static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3233 {
3234 	struct net_device *real_dev = macsec_priv(dev)->real_dev;
3235 
3236 	if (!(dev->flags & IFF_UP))
3237 		return;
3238 
3239 	if (change & IFF_ALLMULTI)
3240 		dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3241 
3242 	if (change & IFF_PROMISC)
3243 		dev_set_promiscuity(real_dev,
3244 				    dev->flags & IFF_PROMISC ? 1 : -1);
3245 }
3246 
3247 static void macsec_dev_set_rx_mode(struct net_device *dev)
3248 {
3249 	struct net_device *real_dev = macsec_priv(dev)->real_dev;
3250 
3251 	dev_mc_sync(real_dev, dev);
3252 	dev_uc_sync(real_dev, dev);
3253 }
3254 
3255 static int macsec_set_mac_address(struct net_device *dev, void *p)
3256 {
3257 	struct macsec_dev *macsec = macsec_priv(dev);
3258 	struct net_device *real_dev = macsec->real_dev;
3259 	struct sockaddr *addr = p;
3260 	int err;
3261 
3262 	if (!is_valid_ether_addr(addr->sa_data))
3263 		return -EADDRNOTAVAIL;
3264 
3265 	if (!(dev->flags & IFF_UP))
3266 		goto out;
3267 
3268 	err = dev_uc_add(real_dev, addr->sa_data);
3269 	if (err < 0)
3270 		return err;
3271 
3272 	dev_uc_del(real_dev, dev->dev_addr);
3273 
3274 out:
3275 	ether_addr_copy(dev->dev_addr, addr->sa_data);
3276 	macsec->secy.sci = dev_to_sci(dev, MACSEC_PORT_ES);
3277 
3278 	/* If h/w offloading is available, propagate to the device */
3279 	if (macsec_is_offloaded(macsec)) {
3280 		const struct macsec_ops *ops;
3281 		struct macsec_context ctx;
3282 
3283 		ops = macsec_get_ops(macsec, &ctx);
3284 		if (ops) {
3285 			ctx.secy = &macsec->secy;
3286 			macsec_offload(ops->mdo_upd_secy, &ctx);
3287 		}
3288 	}
3289 
3290 	return 0;
3291 }
3292 
3293 static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3294 {
3295 	struct macsec_dev *macsec = macsec_priv(dev);
3296 	unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3297 
3298 	if (macsec->real_dev->mtu - extra < new_mtu)
3299 		return -ERANGE;
3300 
3301 	dev->mtu = new_mtu;
3302 
3303 	return 0;
3304 }
3305 
3306 static void macsec_get_stats64(struct net_device *dev,
3307 			       struct rtnl_link_stats64 *s)
3308 {
3309 	int cpu;
3310 
3311 	if (!dev->tstats)
3312 		return;
3313 
3314 	for_each_possible_cpu(cpu) {
3315 		struct pcpu_sw_netstats *stats;
3316 		struct pcpu_sw_netstats tmp;
3317 		int start;
3318 
3319 		stats = per_cpu_ptr(dev->tstats, cpu);
3320 		do {
3321 			start = u64_stats_fetch_begin_irq(&stats->syncp);
3322 			tmp.rx_packets = stats->rx_packets;
3323 			tmp.rx_bytes   = stats->rx_bytes;
3324 			tmp.tx_packets = stats->tx_packets;
3325 			tmp.tx_bytes   = stats->tx_bytes;
3326 		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
3327 
3328 		s->rx_packets += tmp.rx_packets;
3329 		s->rx_bytes   += tmp.rx_bytes;
3330 		s->tx_packets += tmp.tx_packets;
3331 		s->tx_bytes   += tmp.tx_bytes;
3332 	}
3333 
3334 	s->rx_dropped = dev->stats.rx_dropped;
3335 	s->tx_dropped = dev->stats.tx_dropped;
3336 }
3337 
3338 static int macsec_get_iflink(const struct net_device *dev)
3339 {
3340 	return macsec_priv(dev)->real_dev->ifindex;
3341 }
3342 
3343 static const struct net_device_ops macsec_netdev_ops = {
3344 	.ndo_init		= macsec_dev_init,
3345 	.ndo_uninit		= macsec_dev_uninit,
3346 	.ndo_open		= macsec_dev_open,
3347 	.ndo_stop		= macsec_dev_stop,
3348 	.ndo_fix_features	= macsec_fix_features,
3349 	.ndo_change_mtu		= macsec_change_mtu,
3350 	.ndo_set_rx_mode	= macsec_dev_set_rx_mode,
3351 	.ndo_change_rx_flags	= macsec_dev_change_rx_flags,
3352 	.ndo_set_mac_address	= macsec_set_mac_address,
3353 	.ndo_start_xmit		= macsec_start_xmit,
3354 	.ndo_get_stats64	= macsec_get_stats64,
3355 	.ndo_get_iflink		= macsec_get_iflink,
3356 };
3357 
3358 static const struct device_type macsec_type = {
3359 	.name = "macsec",
3360 };
3361 
3362 static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3363 	[IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3364 	[IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3365 	[IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3366 	[IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3367 	[IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3368 	[IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3369 	[IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3370 	[IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3371 	[IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3372 	[IFLA_MACSEC_ES] = { .type = NLA_U8 },
3373 	[IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3374 	[IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3375 	[IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3376 };
3377 
3378 static void macsec_free_netdev(struct net_device *dev)
3379 {
3380 	struct macsec_dev *macsec = macsec_priv(dev);
3381 
3382 	free_percpu(macsec->stats);
3383 	free_percpu(macsec->secy.tx_sc.stats);
3384 
3385 }
3386 
3387 static void macsec_setup(struct net_device *dev)
3388 {
3389 	ether_setup(dev);
3390 	dev->min_mtu = 0;
3391 	dev->max_mtu = ETH_MAX_MTU;
3392 	dev->priv_flags |= IFF_NO_QUEUE;
3393 	dev->netdev_ops = &macsec_netdev_ops;
3394 	dev->needs_free_netdev = true;
3395 	dev->priv_destructor = macsec_free_netdev;
3396 	SET_NETDEV_DEVTYPE(dev, &macsec_type);
3397 
3398 	eth_zero_addr(dev->broadcast);
3399 }
3400 
3401 static int macsec_changelink_common(struct net_device *dev,
3402 				    struct nlattr *data[])
3403 {
3404 	struct macsec_secy *secy;
3405 	struct macsec_tx_sc *tx_sc;
3406 
3407 	secy = &macsec_priv(dev)->secy;
3408 	tx_sc = &secy->tx_sc;
3409 
3410 	if (data[IFLA_MACSEC_ENCODING_SA]) {
3411 		struct macsec_tx_sa *tx_sa;
3412 
3413 		tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3414 		tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3415 
3416 		secy->operational = tx_sa && tx_sa->active;
3417 	}
3418 
3419 	if (data[IFLA_MACSEC_WINDOW])
3420 		secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3421 
3422 	if (data[IFLA_MACSEC_ENCRYPT])
3423 		tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3424 
3425 	if (data[IFLA_MACSEC_PROTECT])
3426 		secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3427 
3428 	if (data[IFLA_MACSEC_INC_SCI])
3429 		tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3430 
3431 	if (data[IFLA_MACSEC_ES])
3432 		tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3433 
3434 	if (data[IFLA_MACSEC_SCB])
3435 		tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3436 
3437 	if (data[IFLA_MACSEC_REPLAY_PROTECT])
3438 		secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3439 
3440 	if (data[IFLA_MACSEC_VALIDATION])
3441 		secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3442 
3443 	if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3444 		switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3445 		case MACSEC_CIPHER_ID_GCM_AES_128:
3446 		case MACSEC_DEFAULT_CIPHER_ID:
3447 			secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3448 			break;
3449 		case MACSEC_CIPHER_ID_GCM_AES_256:
3450 			secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3451 			break;
3452 		default:
3453 			return -EINVAL;
3454 		}
3455 	}
3456 
3457 	return 0;
3458 }
3459 
3460 static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3461 			     struct nlattr *data[],
3462 			     struct netlink_ext_ack *extack)
3463 {
3464 	struct macsec_dev *macsec = macsec_priv(dev);
3465 	struct macsec_tx_sa tx_sc;
3466 	struct macsec_secy secy;
3467 	int ret;
3468 
3469 	if (!data)
3470 		return 0;
3471 
3472 	if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3473 	    data[IFLA_MACSEC_ICV_LEN] ||
3474 	    data[IFLA_MACSEC_SCI] ||
3475 	    data[IFLA_MACSEC_PORT])
3476 		return -EINVAL;
3477 
3478 	/* Keep a copy of unmodified secy and tx_sc, in case the offload
3479 	 * propagation fails, to revert macsec_changelink_common.
3480 	 */
3481 	memcpy(&secy, &macsec->secy, sizeof(secy));
3482 	memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3483 
3484 	ret = macsec_changelink_common(dev, data);
3485 	if (ret)
3486 		return ret;
3487 
3488 	/* If h/w offloading is available, propagate to the device */
3489 	if (macsec_is_offloaded(macsec)) {
3490 		const struct macsec_ops *ops;
3491 		struct macsec_context ctx;
3492 		int ret;
3493 
3494 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
3495 		if (!ops) {
3496 			ret = -EOPNOTSUPP;
3497 			goto cleanup;
3498 		}
3499 
3500 		ctx.secy = &macsec->secy;
3501 		ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3502 		if (ret)
3503 			goto cleanup;
3504 	}
3505 
3506 	return 0;
3507 
3508 cleanup:
3509 	memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3510 	memcpy(&macsec->secy, &secy, sizeof(secy));
3511 
3512 	return ret;
3513 }
3514 
3515 static void macsec_del_dev(struct macsec_dev *macsec)
3516 {
3517 	int i;
3518 
3519 	while (macsec->secy.rx_sc) {
3520 		struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3521 
3522 		rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3523 		free_rx_sc(rx_sc);
3524 	}
3525 
3526 	for (i = 0; i < MACSEC_NUM_AN; i++) {
3527 		struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3528 
3529 		if (sa) {
3530 			RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3531 			clear_tx_sa(sa);
3532 		}
3533 	}
3534 }
3535 
3536 static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3537 {
3538 	struct macsec_dev *macsec = macsec_priv(dev);
3539 	struct net_device *real_dev = macsec->real_dev;
3540 
3541 	unregister_netdevice_queue(dev, head);
3542 	list_del_rcu(&macsec->secys);
3543 	macsec_del_dev(macsec);
3544 	netdev_upper_dev_unlink(real_dev, dev);
3545 
3546 	macsec_generation++;
3547 }
3548 
3549 static void macsec_dellink(struct net_device *dev, struct list_head *head)
3550 {
3551 	struct macsec_dev *macsec = macsec_priv(dev);
3552 	struct net_device *real_dev = macsec->real_dev;
3553 	struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3554 
3555 	/* If h/w offloading is available, propagate to the device */
3556 	if (macsec_is_offloaded(macsec)) {
3557 		const struct macsec_ops *ops;
3558 		struct macsec_context ctx;
3559 
3560 		ops = macsec_get_ops(netdev_priv(dev), &ctx);
3561 		if (ops) {
3562 			ctx.secy = &macsec->secy;
3563 			macsec_offload(ops->mdo_del_secy, &ctx);
3564 		}
3565 	}
3566 
3567 	macsec_common_dellink(dev, head);
3568 
3569 	if (list_empty(&rxd->secys)) {
3570 		netdev_rx_handler_unregister(real_dev);
3571 		kfree(rxd);
3572 	}
3573 }
3574 
3575 static int register_macsec_dev(struct net_device *real_dev,
3576 			       struct net_device *dev)
3577 {
3578 	struct macsec_dev *macsec = macsec_priv(dev);
3579 	struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3580 
3581 	if (!rxd) {
3582 		int err;
3583 
3584 		rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3585 		if (!rxd)
3586 			return -ENOMEM;
3587 
3588 		INIT_LIST_HEAD(&rxd->secys);
3589 
3590 		err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3591 						 rxd);
3592 		if (err < 0) {
3593 			kfree(rxd);
3594 			return err;
3595 		}
3596 	}
3597 
3598 	list_add_tail_rcu(&macsec->secys, &rxd->secys);
3599 	return 0;
3600 }
3601 
3602 static bool sci_exists(struct net_device *dev, sci_t sci)
3603 {
3604 	struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3605 	struct macsec_dev *macsec;
3606 
3607 	list_for_each_entry(macsec, &rxd->secys, secys) {
3608 		if (macsec->secy.sci == sci)
3609 			return true;
3610 	}
3611 
3612 	return false;
3613 }
3614 
3615 static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3616 {
3617 	struct macsec_dev *macsec = macsec_priv(dev);
3618 	struct macsec_secy *secy = &macsec->secy;
3619 
3620 	macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3621 	if (!macsec->stats)
3622 		return -ENOMEM;
3623 
3624 	secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3625 	if (!secy->tx_sc.stats) {
3626 		free_percpu(macsec->stats);
3627 		return -ENOMEM;
3628 	}
3629 
3630 	if (sci == MACSEC_UNDEF_SCI)
3631 		sci = dev_to_sci(dev, MACSEC_PORT_ES);
3632 
3633 	secy->netdev = dev;
3634 	secy->operational = true;
3635 	secy->key_len = DEFAULT_SAK_LEN;
3636 	secy->icv_len = icv_len;
3637 	secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3638 	secy->protect_frames = true;
3639 	secy->replay_protect = false;
3640 
3641 	secy->sci = sci;
3642 	secy->tx_sc.active = true;
3643 	secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3644 	secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3645 	secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3646 	secy->tx_sc.end_station = false;
3647 	secy->tx_sc.scb = false;
3648 
3649 	return 0;
3650 }
3651 
3652 static int macsec_newlink(struct net *net, struct net_device *dev,
3653 			  struct nlattr *tb[], struct nlattr *data[],
3654 			  struct netlink_ext_ack *extack)
3655 {
3656 	struct macsec_dev *macsec = macsec_priv(dev);
3657 	struct net_device *real_dev;
3658 	int err;
3659 	sci_t sci;
3660 	u8 icv_len = DEFAULT_ICV_LEN;
3661 	rx_handler_func_t *rx_handler;
3662 
3663 	if (!tb[IFLA_LINK])
3664 		return -EINVAL;
3665 	real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3666 	if (!real_dev)
3667 		return -ENODEV;
3668 
3669 	dev->priv_flags |= IFF_MACSEC;
3670 
3671 	macsec->real_dev = real_dev;
3672 
3673 	/* MACsec offloading is off by default */
3674 	macsec->offload = MACSEC_OFFLOAD_OFF;
3675 
3676 	if (data && data[IFLA_MACSEC_ICV_LEN])
3677 		icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3678 	dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3679 
3680 	rx_handler = rtnl_dereference(real_dev->rx_handler);
3681 	if (rx_handler && rx_handler != macsec_handle_frame)
3682 		return -EBUSY;
3683 
3684 	err = register_netdevice(dev);
3685 	if (err < 0)
3686 		return err;
3687 
3688 	err = netdev_upper_dev_link(real_dev, dev, extack);
3689 	if (err < 0)
3690 		goto unregister;
3691 
3692 	/* need to be already registered so that ->init has run and
3693 	 * the MAC addr is set
3694 	 */
3695 	if (data && data[IFLA_MACSEC_SCI])
3696 		sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3697 	else if (data && data[IFLA_MACSEC_PORT])
3698 		sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3699 	else
3700 		sci = dev_to_sci(dev, MACSEC_PORT_ES);
3701 
3702 	if (rx_handler && sci_exists(real_dev, sci)) {
3703 		err = -EBUSY;
3704 		goto unlink;
3705 	}
3706 
3707 	err = macsec_add_dev(dev, sci, icv_len);
3708 	if (err)
3709 		goto unlink;
3710 
3711 	if (data) {
3712 		err = macsec_changelink_common(dev, data);
3713 		if (err)
3714 			goto del_dev;
3715 	}
3716 
3717 	err = register_macsec_dev(real_dev, dev);
3718 	if (err < 0)
3719 		goto del_dev;
3720 
3721 	netif_stacked_transfer_operstate(real_dev, dev);
3722 	linkwatch_fire_event(dev);
3723 
3724 	macsec_generation++;
3725 
3726 	return 0;
3727 
3728 del_dev:
3729 	macsec_del_dev(macsec);
3730 unlink:
3731 	netdev_upper_dev_unlink(real_dev, dev);
3732 unregister:
3733 	unregister_netdevice(dev);
3734 	return err;
3735 }
3736 
3737 static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
3738 				struct netlink_ext_ack *extack)
3739 {
3740 	u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3741 	u8 icv_len = DEFAULT_ICV_LEN;
3742 	int flag;
3743 	bool es, scb, sci;
3744 
3745 	if (!data)
3746 		return 0;
3747 
3748 	if (data[IFLA_MACSEC_CIPHER_SUITE])
3749 		csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3750 
3751 	if (data[IFLA_MACSEC_ICV_LEN]) {
3752 		icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3753 		if (icv_len != DEFAULT_ICV_LEN) {
3754 			char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3755 			struct crypto_aead *dummy_tfm;
3756 
3757 			dummy_tfm = macsec_alloc_tfm(dummy_key,
3758 						     DEFAULT_SAK_LEN,
3759 						     icv_len);
3760 			if (IS_ERR(dummy_tfm))
3761 				return PTR_ERR(dummy_tfm);
3762 			crypto_free_aead(dummy_tfm);
3763 		}
3764 	}
3765 
3766 	switch (csid) {
3767 	case MACSEC_CIPHER_ID_GCM_AES_128:
3768 	case MACSEC_CIPHER_ID_GCM_AES_256:
3769 	case MACSEC_DEFAULT_CIPHER_ID:
3770 		if (icv_len < MACSEC_MIN_ICV_LEN ||
3771 		    icv_len > MACSEC_STD_ICV_LEN)
3772 			return -EINVAL;
3773 		break;
3774 	default:
3775 		return -EINVAL;
3776 	}
3777 
3778 	if (data[IFLA_MACSEC_ENCODING_SA]) {
3779 		if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3780 			return -EINVAL;
3781 	}
3782 
3783 	for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3784 	     flag < IFLA_MACSEC_VALIDATION;
3785 	     flag++) {
3786 		if (data[flag]) {
3787 			if (nla_get_u8(data[flag]) > 1)
3788 				return -EINVAL;
3789 		}
3790 	}
3791 
3792 	es  = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3793 	sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3794 	scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3795 
3796 	if ((sci && (scb || es)) || (scb && es))
3797 		return -EINVAL;
3798 
3799 	if (data[IFLA_MACSEC_VALIDATION] &&
3800 	    nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3801 		return -EINVAL;
3802 
3803 	if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3804 	     nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3805 	    !data[IFLA_MACSEC_WINDOW])
3806 		return -EINVAL;
3807 
3808 	return 0;
3809 }
3810 
3811 static struct net *macsec_get_link_net(const struct net_device *dev)
3812 {
3813 	return dev_net(macsec_priv(dev)->real_dev);
3814 }
3815 
3816 static size_t macsec_get_size(const struct net_device *dev)
3817 {
3818 	return  nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3819 		nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3820 		nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3821 		nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3822 		nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3823 		nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3824 		nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3825 		nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3826 		nla_total_size(1) + /* IFLA_MACSEC_ES */
3827 		nla_total_size(1) + /* IFLA_MACSEC_SCB */
3828 		nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3829 		nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3830 		0;
3831 }
3832 
3833 static int macsec_fill_info(struct sk_buff *skb,
3834 			    const struct net_device *dev)
3835 {
3836 	struct macsec_secy *secy = &macsec_priv(dev)->secy;
3837 	struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3838 	u64 csid;
3839 
3840 	switch (secy->key_len) {
3841 	case MACSEC_GCM_AES_128_SAK_LEN:
3842 		csid = MACSEC_DEFAULT_CIPHER_ID;
3843 		break;
3844 	case MACSEC_GCM_AES_256_SAK_LEN:
3845 		csid = MACSEC_CIPHER_ID_GCM_AES_256;
3846 		break;
3847 	default:
3848 		goto nla_put_failure;
3849 	}
3850 
3851 	if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3852 			IFLA_MACSEC_PAD) ||
3853 	    nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3854 	    nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3855 			      csid, IFLA_MACSEC_PAD) ||
3856 	    nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3857 	    nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3858 	    nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3859 	    nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3860 	    nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3861 	    nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3862 	    nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3863 	    nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3864 	    0)
3865 		goto nla_put_failure;
3866 
3867 	if (secy->replay_protect) {
3868 		if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3869 			goto nla_put_failure;
3870 	}
3871 
3872 	return 0;
3873 
3874 nla_put_failure:
3875 	return -EMSGSIZE;
3876 }
3877 
3878 static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3879 	.kind		= "macsec",
3880 	.priv_size	= sizeof(struct macsec_dev),
3881 	.maxtype	= IFLA_MACSEC_MAX,
3882 	.policy		= macsec_rtnl_policy,
3883 	.setup		= macsec_setup,
3884 	.validate	= macsec_validate_attr,
3885 	.newlink	= macsec_newlink,
3886 	.changelink	= macsec_changelink,
3887 	.dellink	= macsec_dellink,
3888 	.get_size	= macsec_get_size,
3889 	.fill_info	= macsec_fill_info,
3890 	.get_link_net	= macsec_get_link_net,
3891 };
3892 
3893 static bool is_macsec_master(struct net_device *dev)
3894 {
3895 	return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3896 }
3897 
3898 static int macsec_notify(struct notifier_block *this, unsigned long event,
3899 			 void *ptr)
3900 {
3901 	struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3902 	LIST_HEAD(head);
3903 
3904 	if (!is_macsec_master(real_dev))
3905 		return NOTIFY_DONE;
3906 
3907 	switch (event) {
3908 	case NETDEV_DOWN:
3909 	case NETDEV_UP:
3910 	case NETDEV_CHANGE: {
3911 		struct macsec_dev *m, *n;
3912 		struct macsec_rxh_data *rxd;
3913 
3914 		rxd = macsec_data_rtnl(real_dev);
3915 		list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3916 			struct net_device *dev = m->secy.netdev;
3917 
3918 			netif_stacked_transfer_operstate(real_dev, dev);
3919 		}
3920 		break;
3921 	}
3922 	case NETDEV_UNREGISTER: {
3923 		struct macsec_dev *m, *n;
3924 		struct macsec_rxh_data *rxd;
3925 
3926 		rxd = macsec_data_rtnl(real_dev);
3927 		list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3928 			macsec_common_dellink(m->secy.netdev, &head);
3929 		}
3930 
3931 		netdev_rx_handler_unregister(real_dev);
3932 		kfree(rxd);
3933 
3934 		unregister_netdevice_many(&head);
3935 		break;
3936 	}
3937 	case NETDEV_CHANGEMTU: {
3938 		struct macsec_dev *m;
3939 		struct macsec_rxh_data *rxd;
3940 
3941 		rxd = macsec_data_rtnl(real_dev);
3942 		list_for_each_entry(m, &rxd->secys, secys) {
3943 			struct net_device *dev = m->secy.netdev;
3944 			unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3945 							    macsec_extra_len(true));
3946 
3947 			if (dev->mtu > mtu)
3948 				dev_set_mtu(dev, mtu);
3949 		}
3950 	}
3951 	}
3952 
3953 	return NOTIFY_OK;
3954 }
3955 
3956 static struct notifier_block macsec_notifier = {
3957 	.notifier_call = macsec_notify,
3958 };
3959 
3960 static int __init macsec_init(void)
3961 {
3962 	int err;
3963 
3964 	pr_info("MACsec IEEE 802.1AE\n");
3965 	err = register_netdevice_notifier(&macsec_notifier);
3966 	if (err)
3967 		return err;
3968 
3969 	err = rtnl_link_register(&macsec_link_ops);
3970 	if (err)
3971 		goto notifier;
3972 
3973 	err = genl_register_family(&macsec_fam);
3974 	if (err)
3975 		goto rtnl;
3976 
3977 	return 0;
3978 
3979 rtnl:
3980 	rtnl_link_unregister(&macsec_link_ops);
3981 notifier:
3982 	unregister_netdevice_notifier(&macsec_notifier);
3983 	return err;
3984 }
3985 
3986 static void __exit macsec_exit(void)
3987 {
3988 	genl_unregister_family(&macsec_fam);
3989 	rtnl_link_unregister(&macsec_link_ops);
3990 	unregister_netdevice_notifier(&macsec_notifier);
3991 	rcu_barrier();
3992 }
3993 
3994 module_init(macsec_init);
3995 module_exit(macsec_exit);
3996 
3997 MODULE_ALIAS_RTNL_LINK("macsec");
3998 MODULE_ALIAS_GENL_FAMILY("macsec");
3999 
4000 MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4001 MODULE_LICENSE("GPL v2");
4002