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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/rtnetlink.h>
15#include <linux/refcount.h>
16#include <net/genetlink.h>
17#include <net/sock.h>
18#include <net/gro_cells.h>
19
20#include <uapi/linux/if_macsec.h>
21
22typedef u64 __bitwise sci_t;
23
24#define MACSEC_SCI_LEN 8
25
26/* SecTAG length = macsec_eth_header without the optional SCI */
27#define MACSEC_TAG_LEN 6
28
29struct macsec_eth_header {
30 struct ethhdr eth;
31 /* SecTAG */
32 u8 tci_an;
33#if defined(__LITTLE_ENDIAN_BITFIELD)
34 u8 short_length:6,
35 unused:2;
36#elif defined(__BIG_ENDIAN_BITFIELD)
37 u8 unused:2,
38 short_length:6;
39#else
40#error "Please fix <asm/byteorder.h>"
41#endif
42 __be32 packet_number;
43 u8 secure_channel_id[8]; /* optional */
44} __packed;
45
46#define MACSEC_TCI_VERSION 0x80
47#define MACSEC_TCI_ES 0x40 /* end station */
48#define MACSEC_TCI_SC 0x20 /* SCI present */
49#define MACSEC_TCI_SCB 0x10 /* epon */
50#define MACSEC_TCI_E 0x08 /* encryption */
51#define MACSEC_TCI_C 0x04 /* changed text */
52#define MACSEC_AN_MASK 0x03 /* association number */
53#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
54
55/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
56#define MIN_NON_SHORT_LEN 48
57
58#define GCM_AES_IV_LEN 12
59#define DEFAULT_ICV_LEN 16
60
61#define MACSEC_NUM_AN 4 /* 2 bits for the association number */
62
63#define for_each_rxsc(secy, sc) \
64 for (sc = rcu_dereference_bh(secy->rx_sc); \
65 sc; \
66 sc = rcu_dereference_bh(sc->next))
67#define for_each_rxsc_rtnl(secy, sc) \
68 for (sc = rtnl_dereference(secy->rx_sc); \
69 sc; \
70 sc = rtnl_dereference(sc->next))
71
72struct gcm_iv {
73 union {
74 u8 secure_channel_id[8];
75 sci_t sci;
76 };
77 __be32 pn;
78};
79
80/**
81 * struct macsec_key - SA key
82 * @id: user-provided key identifier
83 * @tfm: crypto struct, key storage
84 */
85struct macsec_key {
86 u8 id[MACSEC_KEYID_LEN];
87 struct crypto_aead *tfm;
88};
89
90struct macsec_rx_sc_stats {
91 __u64 InOctetsValidated;
92 __u64 InOctetsDecrypted;
93 __u64 InPktsUnchecked;
94 __u64 InPktsDelayed;
95 __u64 InPktsOK;
96 __u64 InPktsInvalid;
97 __u64 InPktsLate;
98 __u64 InPktsNotValid;
99 __u64 InPktsNotUsingSA;
100 __u64 InPktsUnusedSA;
101};
102
103struct macsec_rx_sa_stats {
104 __u32 InPktsOK;
105 __u32 InPktsInvalid;
106 __u32 InPktsNotValid;
107 __u32 InPktsNotUsingSA;
108 __u32 InPktsUnusedSA;
109};
110
111struct macsec_tx_sa_stats {
112 __u32 OutPktsProtected;
113 __u32 OutPktsEncrypted;
114};
115
116struct macsec_tx_sc_stats {
117 __u64 OutPktsProtected;
118 __u64 OutPktsEncrypted;
119 __u64 OutOctetsProtected;
120 __u64 OutOctetsEncrypted;
121};
122
123struct macsec_dev_stats {
124 __u64 OutPktsUntagged;
125 __u64 InPktsUntagged;
126 __u64 OutPktsTooLong;
127 __u64 InPktsNoTag;
128 __u64 InPktsBadTag;
129 __u64 InPktsUnknownSCI;
130 __u64 InPktsNoSCI;
131 __u64 InPktsOverrun;
132};
133
134/**
135 * struct macsec_rx_sa - receive secure association
136 * @active:
137 * @next_pn: packet number expected for the next packet
138 * @lock: protects next_pn manipulations
139 * @key: key structure
140 * @stats: per-SA stats
141 */
142struct macsec_rx_sa {
143 struct macsec_key key;
144 spinlock_t lock;
145 u32 next_pn;
146 refcount_t refcnt;
147 bool active;
148 struct macsec_rx_sa_stats __percpu *stats;
149 struct macsec_rx_sc *sc;
150 struct rcu_head rcu;
151};
152
153struct pcpu_rx_sc_stats {
154 struct macsec_rx_sc_stats stats;
155 struct u64_stats_sync syncp;
156};
157
158/**
159 * struct macsec_rx_sc - receive secure channel
160 * @sci: secure channel identifier for this SC
161 * @active: channel is active
162 * @sa: array of secure associations
163 * @stats: per-SC stats
164 */
165struct macsec_rx_sc {
166 struct macsec_rx_sc __rcu *next;
167 sci_t sci;
168 bool active;
169 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
170 struct pcpu_rx_sc_stats __percpu *stats;
171 refcount_t refcnt;
172 struct rcu_head rcu_head;
173};
174
175/**
176 * struct macsec_tx_sa - transmit secure association
177 * @active:
178 * @next_pn: packet number to use for the next packet
179 * @lock: protects next_pn manipulations
180 * @key: key structure
181 * @stats: per-SA stats
182 */
183struct macsec_tx_sa {
184 struct macsec_key key;
185 spinlock_t lock;
186 u32 next_pn;
187 refcount_t refcnt;
188 bool active;
189 struct macsec_tx_sa_stats __percpu *stats;
190 struct rcu_head rcu;
191};
192
193struct pcpu_tx_sc_stats {
194 struct macsec_tx_sc_stats stats;
195 struct u64_stats_sync syncp;
196};
197
198/**
199 * struct macsec_tx_sc - transmit secure channel
200 * @active:
201 * @encoding_sa: association number of the SA currently in use
202 * @encrypt: encrypt packets on transmit, or authenticate only
203 * @send_sci: always include the SCI in the SecTAG
204 * @end_station:
205 * @scb: single copy broadcast flag
206 * @sa: array of secure associations
207 * @stats: stats for this TXSC
208 */
209struct macsec_tx_sc {
210 bool active;
211 u8 encoding_sa;
212 bool encrypt;
213 bool send_sci;
214 bool end_station;
215 bool scb;
216 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
217 struct pcpu_tx_sc_stats __percpu *stats;
218};
219
220#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
221
222/**
223 * struct macsec_secy - MACsec Security Entity
224 * @netdev: netdevice for this SecY
225 * @n_rx_sc: number of receive secure channels configured on this SecY
226 * @sci: secure channel identifier used for tx
227 * @key_len: length of keys used by the cipher suite
228 * @icv_len: length of ICV used by the cipher suite
229 * @validate_frames: validation mode
230 * @operational: MAC_Operational flag
231 * @protect_frames: enable protection for this SecY
232 * @replay_protect: enable packet number checks on receive
233 * @replay_window: size of the replay window
234 * @tx_sc: transmit secure channel
235 * @rx_sc: linked list of receive secure channels
236 */
237struct macsec_secy {
238 struct net_device *netdev;
239 unsigned int n_rx_sc;
240 sci_t sci;
241 u16 key_len;
242 u16 icv_len;
243 enum macsec_validation_type validate_frames;
244 bool operational;
245 bool protect_frames;
246 bool replay_protect;
247 u32 replay_window;
248 struct macsec_tx_sc tx_sc;
249 struct macsec_rx_sc __rcu *rx_sc;
250};
251
252struct pcpu_secy_stats {
253 struct macsec_dev_stats stats;
254 struct u64_stats_sync syncp;
255};
256
257/**
258 * struct macsec_dev - private data
259 * @secy: SecY config
260 * @real_dev: pointer to underlying netdevice
261 * @stats: MACsec device stats
262 * @secys: linked list of SecY's on the underlying device
263 */
264struct macsec_dev {
265 struct macsec_secy secy;
266 struct net_device *real_dev;
267 struct pcpu_secy_stats __percpu *stats;
268 struct list_head secys;
269 struct gro_cells gro_cells;
270};
271
272/**
273 * struct macsec_rxh_data - rx_handler private argument
274 * @secys: linked list of SecY's on this underlying device
275 */
276struct macsec_rxh_data {
277 struct list_head secys;
278};
279
280static struct macsec_dev *macsec_priv(const struct net_device *dev)
281{
282 return (struct macsec_dev *)netdev_priv(dev);
283}
284
285static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
286{
287 return rcu_dereference_bh(dev->rx_handler_data);
288}
289
290static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
291{
292 return rtnl_dereference(dev->rx_handler_data);
293}
294
295struct macsec_cb {
296 struct aead_request *req;
297 union {
298 struct macsec_tx_sa *tx_sa;
299 struct macsec_rx_sa *rx_sa;
300 };
301 u8 assoc_num;
302 bool valid;
303 bool has_sci;
304};
305
306static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
307{
308 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
309
310 if (!sa || !sa->active)
311 return NULL;
312
313 if (!refcount_inc_not_zero(&sa->refcnt))
314 return NULL;
315
316 return sa;
317}
318
319static void free_rx_sc_rcu(struct rcu_head *head)
320{
321 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
322
323 free_percpu(rx_sc->stats);
324 kfree(rx_sc);
325}
326
327static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
328{
329 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
330}
331
332static void macsec_rxsc_put(struct macsec_rx_sc *sc)
333{
334 if (refcount_dec_and_test(&sc->refcnt))
335 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
336}
337
338static void free_rxsa(struct rcu_head *head)
339{
340 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
341
342 crypto_free_aead(sa->key.tfm);
343 free_percpu(sa->stats);
344 kfree(sa);
345}
346
347static void macsec_rxsa_put(struct macsec_rx_sa *sa)
348{
349 if (refcount_dec_and_test(&sa->refcnt))
350 call_rcu(&sa->rcu, free_rxsa);
351}
352
353static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
354{
355 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
356
357 if (!sa || !sa->active)
358 return NULL;
359
360 if (!refcount_inc_not_zero(&sa->refcnt))
361 return NULL;
362
363 return sa;
364}
365
366static void free_txsa(struct rcu_head *head)
367{
368 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
369
370 crypto_free_aead(sa->key.tfm);
371 free_percpu(sa->stats);
372 kfree(sa);
373}
374
375static void macsec_txsa_put(struct macsec_tx_sa *sa)
376{
377 if (refcount_dec_and_test(&sa->refcnt))
378 call_rcu(&sa->rcu, free_txsa);
379}
380
381static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
382{
383 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
384 return (struct macsec_cb *)skb->cb;
385}
386
387#define MACSEC_PORT_ES (htons(0x0001))
388#define MACSEC_PORT_SCB (0x0000)
389#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
390
391#define MACSEC_GCM_AES_128_SAK_LEN 16
392#define MACSEC_GCM_AES_256_SAK_LEN 32
393
394#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
395#define DEFAULT_SEND_SCI true
396#define DEFAULT_ENCRYPT false
397#define DEFAULT_ENCODING_SA 0
398
399static bool send_sci(const struct macsec_secy *secy)
400{
401 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
402
403 return tx_sc->send_sci ||
404 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
405}
406
407static sci_t make_sci(u8 *addr, __be16 port)
408{
409 sci_t sci;
410
411 memcpy(&sci, addr, ETH_ALEN);
412 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
413
414 return sci;
415}
416
417static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
418{
419 sci_t sci;
420
421 if (sci_present)
422 memcpy(&sci, hdr->secure_channel_id,
423 sizeof(hdr->secure_channel_id));
424 else
425 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
426
427 return sci;
428}
429
430static unsigned int macsec_sectag_len(bool sci_present)
431{
432 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
433}
434
435static unsigned int macsec_hdr_len(bool sci_present)
436{
437 return macsec_sectag_len(sci_present) + ETH_HLEN;
438}
439
440static unsigned int macsec_extra_len(bool sci_present)
441{
442 return macsec_sectag_len(sci_present) + sizeof(__be16);
443}
444
445/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
446static void macsec_fill_sectag(struct macsec_eth_header *h,
447 const struct macsec_secy *secy, u32 pn,
448 bool sci_present)
449{
450 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
451
452 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
453 h->eth.h_proto = htons(ETH_P_MACSEC);
454
455 if (sci_present) {
456 h->tci_an |= MACSEC_TCI_SC;
457 memcpy(&h->secure_channel_id, &secy->sci,
458 sizeof(h->secure_channel_id));
459 } else {
460 if (tx_sc->end_station)
461 h->tci_an |= MACSEC_TCI_ES;
462 if (tx_sc->scb)
463 h->tci_an |= MACSEC_TCI_SCB;
464 }
465
466 h->packet_number = htonl(pn);
467
468 /* with GCM, C/E clear for !encrypt, both set for encrypt */
469 if (tx_sc->encrypt)
470 h->tci_an |= MACSEC_TCI_CONFID;
471 else if (secy->icv_len != DEFAULT_ICV_LEN)
472 h->tci_an |= MACSEC_TCI_C;
473
474 h->tci_an |= tx_sc->encoding_sa;
475}
476
477static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
478{
479 if (data_len < MIN_NON_SHORT_LEN)
480 h->short_length = data_len;
481}
482
483/* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
484static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
485{
486 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
487 int len = skb->len - 2 * ETH_ALEN;
488 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
489
490 /* a) It comprises at least 17 octets */
491 if (skb->len <= 16)
492 return false;
493
494 /* b) MACsec EtherType: already checked */
495
496 /* c) V bit is clear */
497 if (h->tci_an & MACSEC_TCI_VERSION)
498 return false;
499
500 /* d) ES or SCB => !SC */
501 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
502 (h->tci_an & MACSEC_TCI_SC))
503 return false;
504
505 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
506 if (h->unused)
507 return false;
508
509 /* rx.pn != 0 (figure 10-5) */
510 if (!h->packet_number)
511 return false;
512
513 /* length check, f) g) h) i) */
514 if (h->short_length)
515 return len == extra_len + h->short_length;
516 return len >= extra_len + MIN_NON_SHORT_LEN;
517}
518
519#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
520#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
521
522static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
523{
524 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
525
526 gcm_iv->sci = sci;
527 gcm_iv->pn = htonl(pn);
528}
529
530static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
531{
532 return (struct macsec_eth_header *)skb_mac_header(skb);
533}
534
535static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
536{
537 u32 pn;
538
539 spin_lock_bh(&tx_sa->lock);
540 pn = tx_sa->next_pn;
541
542 tx_sa->next_pn++;
543 if (tx_sa->next_pn == 0) {
544 pr_debug("PN wrapped, transitioning to !oper\n");
545 tx_sa->active = false;
546 if (secy->protect_frames)
547 secy->operational = false;
548 }
549 spin_unlock_bh(&tx_sa->lock);
550
551 return pn;
552}
553
554static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
555{
556 struct macsec_dev *macsec = netdev_priv(dev);
557
558 skb->dev = macsec->real_dev;
559 skb_reset_mac_header(skb);
560 skb->protocol = eth_hdr(skb)->h_proto;
561}
562
563static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
564 struct macsec_tx_sa *tx_sa)
565{
566 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
567
568 u64_stats_update_begin(&txsc_stats->syncp);
569 if (tx_sc->encrypt) {
570 txsc_stats->stats.OutOctetsEncrypted += skb->len;
571 txsc_stats->stats.OutPktsEncrypted++;
572 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
573 } else {
574 txsc_stats->stats.OutOctetsProtected += skb->len;
575 txsc_stats->stats.OutPktsProtected++;
576 this_cpu_inc(tx_sa->stats->OutPktsProtected);
577 }
578 u64_stats_update_end(&txsc_stats->syncp);
579}
580
581static void count_tx(struct net_device *dev, int ret, int len)
582{
583 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
584 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
585
586 u64_stats_update_begin(&stats->syncp);
587 stats->tx_packets++;
588 stats->tx_bytes += len;
589 u64_stats_update_end(&stats->syncp);
590 }
591}
592
593static void macsec_encrypt_done(struct crypto_async_request *base, int err)
594{
595 struct sk_buff *skb = base->data;
596 struct net_device *dev = skb->dev;
597 struct macsec_dev *macsec = macsec_priv(dev);
598 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
599 int len, ret;
600
601 aead_request_free(macsec_skb_cb(skb)->req);
602
603 rcu_read_lock_bh();
604 macsec_encrypt_finish(skb, dev);
605 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
606 len = skb->len;
607 ret = dev_queue_xmit(skb);
608 count_tx(dev, ret, len);
609 rcu_read_unlock_bh();
610
611 macsec_txsa_put(sa);
612 dev_put(dev);
613}
614
615static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
616 unsigned char **iv,
617 struct scatterlist **sg,
618 int num_frags)
619{
620 size_t size, iv_offset, sg_offset;
621 struct aead_request *req;
622 void *tmp;
623
624 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
625 iv_offset = size;
626 size += GCM_AES_IV_LEN;
627
628 size = ALIGN(size, __alignof__(struct scatterlist));
629 sg_offset = size;
630 size += sizeof(struct scatterlist) * num_frags;
631
632 tmp = kmalloc(size, GFP_ATOMIC);
633 if (!tmp)
634 return NULL;
635
636 *iv = (unsigned char *)(tmp + iv_offset);
637 *sg = (struct scatterlist *)(tmp + sg_offset);
638 req = tmp;
639
640 aead_request_set_tfm(req, tfm);
641
642 return req;
643}
644
645static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
646 struct net_device *dev)
647{
648 int ret;
649 struct scatterlist *sg;
650 struct sk_buff *trailer;
651 unsigned char *iv;
652 struct ethhdr *eth;
653 struct macsec_eth_header *hh;
654 size_t unprotected_len;
655 struct aead_request *req;
656 struct macsec_secy *secy;
657 struct macsec_tx_sc *tx_sc;
658 struct macsec_tx_sa *tx_sa;
659 struct macsec_dev *macsec = macsec_priv(dev);
660 bool sci_present;
661 u32 pn;
662
663 secy = &macsec->secy;
664 tx_sc = &secy->tx_sc;
665
666 /* 10.5.1 TX SA assignment */
667 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
668 if (!tx_sa) {
669 secy->operational = false;
670 kfree_skb(skb);
671 return ERR_PTR(-EINVAL);
672 }
673
674 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
675 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
676 struct sk_buff *nskb = skb_copy_expand(skb,
677 MACSEC_NEEDED_HEADROOM,
678 MACSEC_NEEDED_TAILROOM,
679 GFP_ATOMIC);
680 if (likely(nskb)) {
681 consume_skb(skb);
682 skb = nskb;
683 } else {
684 macsec_txsa_put(tx_sa);
685 kfree_skb(skb);
686 return ERR_PTR(-ENOMEM);
687 }
688 } else {
689 skb = skb_unshare(skb, GFP_ATOMIC);
690 if (!skb) {
691 macsec_txsa_put(tx_sa);
692 return ERR_PTR(-ENOMEM);
693 }
694 }
695
696 unprotected_len = skb->len;
697 eth = eth_hdr(skb);
698 sci_present = send_sci(secy);
699 hh = skb_push(skb, macsec_extra_len(sci_present));
700 memmove(hh, eth, 2 * ETH_ALEN);
701
702 pn = tx_sa_update_pn(tx_sa, secy);
703 if (pn == 0) {
704 macsec_txsa_put(tx_sa);
705 kfree_skb(skb);
706 return ERR_PTR(-ENOLINK);
707 }
708 macsec_fill_sectag(hh, secy, pn, sci_present);
709 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
710
711 skb_put(skb, secy->icv_len);
712
713 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
714 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
715
716 u64_stats_update_begin(&secy_stats->syncp);
717 secy_stats->stats.OutPktsTooLong++;
718 u64_stats_update_end(&secy_stats->syncp);
719
720 macsec_txsa_put(tx_sa);
721 kfree_skb(skb);
722 return ERR_PTR(-EINVAL);
723 }
724
725 ret = skb_cow_data(skb, 0, &trailer);
726 if (unlikely(ret < 0)) {
727 macsec_txsa_put(tx_sa);
728 kfree_skb(skb);
729 return ERR_PTR(ret);
730 }
731
732 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
733 if (!req) {
734 macsec_txsa_put(tx_sa);
735 kfree_skb(skb);
736 return ERR_PTR(-ENOMEM);
737 }
738
739 macsec_fill_iv(iv, secy->sci, pn);
740
741 sg_init_table(sg, ret);
742 ret = skb_to_sgvec(skb, sg, 0, skb->len);
743 if (unlikely(ret < 0)) {
744 aead_request_free(req);
745 macsec_txsa_put(tx_sa);
746 kfree_skb(skb);
747 return ERR_PTR(ret);
748 }
749
750 if (tx_sc->encrypt) {
751 int len = skb->len - macsec_hdr_len(sci_present) -
752 secy->icv_len;
753 aead_request_set_crypt(req, sg, sg, len, iv);
754 aead_request_set_ad(req, macsec_hdr_len(sci_present));
755 } else {
756 aead_request_set_crypt(req, sg, sg, 0, iv);
757 aead_request_set_ad(req, skb->len - secy->icv_len);
758 }
759
760 macsec_skb_cb(skb)->req = req;
761 macsec_skb_cb(skb)->tx_sa = tx_sa;
762 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
763
764 dev_hold(skb->dev);
765 ret = crypto_aead_encrypt(req);
766 if (ret == -EINPROGRESS) {
767 return ERR_PTR(ret);
768 } else if (ret != 0) {
769 dev_put(skb->dev);
770 kfree_skb(skb);
771 aead_request_free(req);
772 macsec_txsa_put(tx_sa);
773 return ERR_PTR(-EINVAL);
774 }
775
776 dev_put(skb->dev);
777 aead_request_free(req);
778 macsec_txsa_put(tx_sa);
779
780 return skb;
781}
782
783static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
784{
785 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
786 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
787 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
788 u32 lowest_pn = 0;
789
790 spin_lock(&rx_sa->lock);
791 if (rx_sa->next_pn >= secy->replay_window)
792 lowest_pn = rx_sa->next_pn - secy->replay_window;
793
794 /* Now perform replay protection check again
795 * (see IEEE 802.1AE-2006 figure 10-5)
796 */
797 if (secy->replay_protect && pn < lowest_pn) {
798 spin_unlock(&rx_sa->lock);
799 u64_stats_update_begin(&rxsc_stats->syncp);
800 rxsc_stats->stats.InPktsLate++;
801 u64_stats_update_end(&rxsc_stats->syncp);
802 return false;
803 }
804
805 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
806 u64_stats_update_begin(&rxsc_stats->syncp);
807 if (hdr->tci_an & MACSEC_TCI_E)
808 rxsc_stats->stats.InOctetsDecrypted += skb->len;
809 else
810 rxsc_stats->stats.InOctetsValidated += skb->len;
811 u64_stats_update_end(&rxsc_stats->syncp);
812 }
813
814 if (!macsec_skb_cb(skb)->valid) {
815 spin_unlock(&rx_sa->lock);
816
817 /* 10.6.5 */
818 if (hdr->tci_an & MACSEC_TCI_C ||
819 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
820 u64_stats_update_begin(&rxsc_stats->syncp);
821 rxsc_stats->stats.InPktsNotValid++;
822 u64_stats_update_end(&rxsc_stats->syncp);
823 return false;
824 }
825
826 u64_stats_update_begin(&rxsc_stats->syncp);
827 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
828 rxsc_stats->stats.InPktsInvalid++;
829 this_cpu_inc(rx_sa->stats->InPktsInvalid);
830 } else if (pn < lowest_pn) {
831 rxsc_stats->stats.InPktsDelayed++;
832 } else {
833 rxsc_stats->stats.InPktsUnchecked++;
834 }
835 u64_stats_update_end(&rxsc_stats->syncp);
836 } else {
837 u64_stats_update_begin(&rxsc_stats->syncp);
838 if (pn < lowest_pn) {
839 rxsc_stats->stats.InPktsDelayed++;
840 } else {
841 rxsc_stats->stats.InPktsOK++;
842 this_cpu_inc(rx_sa->stats->InPktsOK);
843 }
844 u64_stats_update_end(&rxsc_stats->syncp);
845
846 if (pn >= rx_sa->next_pn)
847 rx_sa->next_pn = pn + 1;
848 spin_unlock(&rx_sa->lock);
849 }
850
851 return true;
852}
853
854static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
855{
856 skb->pkt_type = PACKET_HOST;
857 skb->protocol = eth_type_trans(skb, dev);
858
859 skb_reset_network_header(skb);
860 if (!skb_transport_header_was_set(skb))
861 skb_reset_transport_header(skb);
862 skb_reset_mac_len(skb);
863}
864
865static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
866{
867 skb->ip_summed = CHECKSUM_NONE;
868 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
869 skb_pull(skb, hdr_len);
870 pskb_trim_unique(skb, skb->len - icv_len);
871}
872
873static void count_rx(struct net_device *dev, int len)
874{
875 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
876
877 u64_stats_update_begin(&stats->syncp);
878 stats->rx_packets++;
879 stats->rx_bytes += len;
880 u64_stats_update_end(&stats->syncp);
881}
882
883static void macsec_decrypt_done(struct crypto_async_request *base, int err)
884{
885 struct sk_buff *skb = base->data;
886 struct net_device *dev = skb->dev;
887 struct macsec_dev *macsec = macsec_priv(dev);
888 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
889 struct macsec_rx_sc *rx_sc = rx_sa->sc;
890 int len;
891 u32 pn;
892
893 aead_request_free(macsec_skb_cb(skb)->req);
894
895 if (!err)
896 macsec_skb_cb(skb)->valid = true;
897
898 rcu_read_lock_bh();
899 pn = ntohl(macsec_ethhdr(skb)->packet_number);
900 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
901 rcu_read_unlock_bh();
902 kfree_skb(skb);
903 goto out;
904 }
905
906 macsec_finalize_skb(skb, macsec->secy.icv_len,
907 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
908 macsec_reset_skb(skb, macsec->secy.netdev);
909
910 len = skb->len;
911 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
912 count_rx(dev, len);
913
914 rcu_read_unlock_bh();
915
916out:
917 macsec_rxsa_put(rx_sa);
918 macsec_rxsc_put(rx_sc);
919 dev_put(dev);
920}
921
922static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
923 struct net_device *dev,
924 struct macsec_rx_sa *rx_sa,
925 sci_t sci,
926 struct macsec_secy *secy)
927{
928 int ret;
929 struct scatterlist *sg;
930 struct sk_buff *trailer;
931 unsigned char *iv;
932 struct aead_request *req;
933 struct macsec_eth_header *hdr;
934 u16 icv_len = secy->icv_len;
935
936 macsec_skb_cb(skb)->valid = false;
937 skb = skb_share_check(skb, GFP_ATOMIC);
938 if (!skb)
939 return ERR_PTR(-ENOMEM);
940
941 ret = skb_cow_data(skb, 0, &trailer);
942 if (unlikely(ret < 0)) {
943 kfree_skb(skb);
944 return ERR_PTR(ret);
945 }
946 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
947 if (!req) {
948 kfree_skb(skb);
949 return ERR_PTR(-ENOMEM);
950 }
951
952 hdr = (struct macsec_eth_header *)skb->data;
953 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
954
955 sg_init_table(sg, ret);
956 ret = skb_to_sgvec(skb, sg, 0, skb->len);
957 if (unlikely(ret < 0)) {
958 aead_request_free(req);
959 kfree_skb(skb);
960 return ERR_PTR(ret);
961 }
962
963 if (hdr->tci_an & MACSEC_TCI_E) {
964 /* confidentiality: ethernet + macsec header
965 * authenticated, encrypted payload
966 */
967 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
968
969 aead_request_set_crypt(req, sg, sg, len, iv);
970 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
971 skb = skb_unshare(skb, GFP_ATOMIC);
972 if (!skb) {
973 aead_request_free(req);
974 return ERR_PTR(-ENOMEM);
975 }
976 } else {
977 /* integrity only: all headers + data authenticated */
978 aead_request_set_crypt(req, sg, sg, icv_len, iv);
979 aead_request_set_ad(req, skb->len - icv_len);
980 }
981
982 macsec_skb_cb(skb)->req = req;
983 skb->dev = dev;
984 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
985
986 dev_hold(dev);
987 ret = crypto_aead_decrypt(req);
988 if (ret == -EINPROGRESS) {
989 return ERR_PTR(ret);
990 } else if (ret != 0) {
991 /* decryption/authentication failed
992 * 10.6 if validateFrames is disabled, deliver anyway
993 */
994 if (ret != -EBADMSG) {
995 kfree_skb(skb);
996 skb = ERR_PTR(ret);
997 }
998 } else {
999 macsec_skb_cb(skb)->valid = true;
1000 }
1001 dev_put(dev);
1002
1003 aead_request_free(req);
1004
1005 return skb;
1006}
1007
1008static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
1009{
1010 struct macsec_rx_sc *rx_sc;
1011
1012 for_each_rxsc(secy, rx_sc) {
1013 if (rx_sc->sci == sci)
1014 return rx_sc;
1015 }
1016
1017 return NULL;
1018}
1019
1020static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
1021{
1022 struct macsec_rx_sc *rx_sc;
1023
1024 for_each_rxsc_rtnl(secy, rx_sc) {
1025 if (rx_sc->sci == sci)
1026 return rx_sc;
1027 }
1028
1029 return NULL;
1030}
1031
1032static void handle_not_macsec(struct sk_buff *skb)
1033{
1034 struct macsec_rxh_data *rxd;
1035 struct macsec_dev *macsec;
1036
1037 rcu_read_lock();
1038 rxd = macsec_data_rcu(skb->dev);
1039
1040 /* 10.6 If the management control validateFrames is not
1041 * Strict, frames without a SecTAG are received, counted, and
1042 * delivered to the Controlled Port
1043 */
1044 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1045 struct sk_buff *nskb;
1046 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1047
1048 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1049 u64_stats_update_begin(&secy_stats->syncp);
1050 secy_stats->stats.InPktsNoTag++;
1051 u64_stats_update_end(&secy_stats->syncp);
1052 continue;
1053 }
1054
1055 /* deliver on this port */
1056 nskb = skb_clone(skb, GFP_ATOMIC);
1057 if (!nskb)
1058 break;
1059
1060 nskb->dev = macsec->secy.netdev;
1061
1062 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1063 u64_stats_update_begin(&secy_stats->syncp);
1064 secy_stats->stats.InPktsUntagged++;
1065 u64_stats_update_end(&secy_stats->syncp);
1066 }
1067 }
1068
1069 rcu_read_unlock();
1070}
1071
1072static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1073{
1074 struct sk_buff *skb = *pskb;
1075 struct net_device *dev = skb->dev;
1076 struct macsec_eth_header *hdr;
1077 struct macsec_secy *secy = NULL;
1078 struct macsec_rx_sc *rx_sc;
1079 struct macsec_rx_sa *rx_sa;
1080 struct macsec_rxh_data *rxd;
1081 struct macsec_dev *macsec;
1082 sci_t sci;
1083 u32 pn;
1084 bool cbit;
1085 struct pcpu_rx_sc_stats *rxsc_stats;
1086 struct pcpu_secy_stats *secy_stats;
1087 bool pulled_sci;
1088 int ret;
1089
1090 if (skb_headroom(skb) < ETH_HLEN)
1091 goto drop_direct;
1092
1093 hdr = macsec_ethhdr(skb);
1094 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1095 handle_not_macsec(skb);
1096
1097 /* and deliver to the uncontrolled port */
1098 return RX_HANDLER_PASS;
1099 }
1100
1101 skb = skb_unshare(skb, GFP_ATOMIC);
1102 *pskb = skb;
1103 if (!skb)
1104 return RX_HANDLER_CONSUMED;
1105
1106 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1107 if (!pulled_sci) {
1108 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1109 goto drop_direct;
1110 }
1111
1112 hdr = macsec_ethhdr(skb);
1113
1114 /* Frames with a SecTAG that has the TCI E bit set but the C
1115 * bit clear are discarded, as this reserved encoding is used
1116 * to identify frames with a SecTAG that are not to be
1117 * delivered to the Controlled Port.
1118 */
1119 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1120 return RX_HANDLER_PASS;
1121
1122 /* now, pull the extra length */
1123 if (hdr->tci_an & MACSEC_TCI_SC) {
1124 if (!pulled_sci)
1125 goto drop_direct;
1126 }
1127
1128 /* ethernet header is part of crypto processing */
1129 skb_push(skb, ETH_HLEN);
1130
1131 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1132 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1133 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1134
1135 rcu_read_lock();
1136 rxd = macsec_data_rcu(skb->dev);
1137
1138 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1139 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1140
1141 sc = sc ? macsec_rxsc_get(sc) : NULL;
1142
1143 if (sc) {
1144 secy = &macsec->secy;
1145 rx_sc = sc;
1146 break;
1147 }
1148 }
1149
1150 if (!secy)
1151 goto nosci;
1152
1153 dev = secy->netdev;
1154 macsec = macsec_priv(dev);
1155 secy_stats = this_cpu_ptr(macsec->stats);
1156 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1157
1158 if (!macsec_validate_skb(skb, secy->icv_len)) {
1159 u64_stats_update_begin(&secy_stats->syncp);
1160 secy_stats->stats.InPktsBadTag++;
1161 u64_stats_update_end(&secy_stats->syncp);
1162 goto drop_nosa;
1163 }
1164
1165 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1166 if (!rx_sa) {
1167 /* 10.6.1 if the SA is not in use */
1168
1169 /* If validateFrames is Strict or the C bit in the
1170 * SecTAG is set, discard
1171 */
1172 if (hdr->tci_an & MACSEC_TCI_C ||
1173 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1174 u64_stats_update_begin(&rxsc_stats->syncp);
1175 rxsc_stats->stats.InPktsNotUsingSA++;
1176 u64_stats_update_end(&rxsc_stats->syncp);
1177 goto drop_nosa;
1178 }
1179
1180 /* not Strict, the frame (with the SecTAG and ICV
1181 * removed) is delivered to the Controlled Port.
1182 */
1183 u64_stats_update_begin(&rxsc_stats->syncp);
1184 rxsc_stats->stats.InPktsUnusedSA++;
1185 u64_stats_update_end(&rxsc_stats->syncp);
1186 goto deliver;
1187 }
1188
1189 /* First, PN check to avoid decrypting obviously wrong packets */
1190 pn = ntohl(hdr->packet_number);
1191 if (secy->replay_protect) {
1192 bool late;
1193
1194 spin_lock(&rx_sa->lock);
1195 late = rx_sa->next_pn >= secy->replay_window &&
1196 pn < (rx_sa->next_pn - secy->replay_window);
1197 spin_unlock(&rx_sa->lock);
1198
1199 if (late) {
1200 u64_stats_update_begin(&rxsc_stats->syncp);
1201 rxsc_stats->stats.InPktsLate++;
1202 u64_stats_update_end(&rxsc_stats->syncp);
1203 goto drop;
1204 }
1205 }
1206
1207 macsec_skb_cb(skb)->rx_sa = rx_sa;
1208
1209 /* Disabled && !changed text => skip validation */
1210 if (hdr->tci_an & MACSEC_TCI_C ||
1211 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1212 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1213
1214 if (IS_ERR(skb)) {
1215 /* the decrypt callback needs the reference */
1216 if (PTR_ERR(skb) != -EINPROGRESS) {
1217 macsec_rxsa_put(rx_sa);
1218 macsec_rxsc_put(rx_sc);
1219 }
1220 rcu_read_unlock();
1221 *pskb = NULL;
1222 return RX_HANDLER_CONSUMED;
1223 }
1224
1225 if (!macsec_post_decrypt(skb, secy, pn))
1226 goto drop;
1227
1228deliver:
1229 macsec_finalize_skb(skb, secy->icv_len,
1230 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1231 macsec_reset_skb(skb, secy->netdev);
1232
1233 if (rx_sa)
1234 macsec_rxsa_put(rx_sa);
1235 macsec_rxsc_put(rx_sc);
1236
1237 skb_orphan(skb);
1238 ret = gro_cells_receive(&macsec->gro_cells, skb);
1239 if (ret == NET_RX_SUCCESS)
1240 count_rx(dev, skb->len);
1241 else
1242 macsec->secy.netdev->stats.rx_dropped++;
1243
1244 rcu_read_unlock();
1245
1246 *pskb = NULL;
1247 return RX_HANDLER_CONSUMED;
1248
1249drop:
1250 macsec_rxsa_put(rx_sa);
1251drop_nosa:
1252 macsec_rxsc_put(rx_sc);
1253 rcu_read_unlock();
1254drop_direct:
1255 kfree_skb(skb);
1256 *pskb = NULL;
1257 return RX_HANDLER_CONSUMED;
1258
1259nosci:
1260 /* 10.6.1 if the SC is not found */
1261 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1262 if (!cbit)
1263 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1264 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1265
1266 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1267 struct sk_buff *nskb;
1268
1269 secy_stats = this_cpu_ptr(macsec->stats);
1270
1271 /* If validateFrames is Strict or the C bit in the
1272 * SecTAG is set, discard
1273 */
1274 if (cbit ||
1275 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1276 u64_stats_update_begin(&secy_stats->syncp);
1277 secy_stats->stats.InPktsNoSCI++;
1278 u64_stats_update_end(&secy_stats->syncp);
1279 continue;
1280 }
1281
1282 /* not strict, the frame (with the SecTAG and ICV
1283 * removed) is delivered to the Controlled Port.
1284 */
1285 nskb = skb_clone(skb, GFP_ATOMIC);
1286 if (!nskb)
1287 break;
1288
1289 macsec_reset_skb(nskb, macsec->secy.netdev);
1290
1291 ret = netif_rx(nskb);
1292 if (ret == NET_RX_SUCCESS) {
1293 u64_stats_update_begin(&secy_stats->syncp);
1294 secy_stats->stats.InPktsUnknownSCI++;
1295 u64_stats_update_end(&secy_stats->syncp);
1296 } else {
1297 macsec->secy.netdev->stats.rx_dropped++;
1298 }
1299 }
1300
1301 rcu_read_unlock();
1302 *pskb = skb;
1303 return RX_HANDLER_PASS;
1304}
1305
1306static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1307{
1308 struct crypto_aead *tfm;
1309 int ret;
1310
1311 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1312
1313 if (IS_ERR(tfm))
1314 return tfm;
1315
1316 ret = crypto_aead_setkey(tfm, key, key_len);
1317 if (ret < 0)
1318 goto fail;
1319
1320 ret = crypto_aead_setauthsize(tfm, icv_len);
1321 if (ret < 0)
1322 goto fail;
1323
1324 return tfm;
1325fail:
1326 crypto_free_aead(tfm);
1327 return ERR_PTR(ret);
1328}
1329
1330static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1331 int icv_len)
1332{
1333 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1334 if (!rx_sa->stats)
1335 return -ENOMEM;
1336
1337 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1338 if (IS_ERR(rx_sa->key.tfm)) {
1339 free_percpu(rx_sa->stats);
1340 return PTR_ERR(rx_sa->key.tfm);
1341 }
1342
1343 rx_sa->active = false;
1344 rx_sa->next_pn = 1;
1345 refcount_set(&rx_sa->refcnt, 1);
1346 spin_lock_init(&rx_sa->lock);
1347
1348 return 0;
1349}
1350
1351static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1352{
1353 rx_sa->active = false;
1354
1355 macsec_rxsa_put(rx_sa);
1356}
1357
1358static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1359{
1360 int i;
1361
1362 for (i = 0; i < MACSEC_NUM_AN; i++) {
1363 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1364
1365 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1366 if (sa)
1367 clear_rx_sa(sa);
1368 }
1369
1370 macsec_rxsc_put(rx_sc);
1371}
1372
1373static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1374{
1375 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1376
1377 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1378 rx_sc;
1379 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1380 if (rx_sc->sci == sci) {
1381 if (rx_sc->active)
1382 secy->n_rx_sc--;
1383 rcu_assign_pointer(*rx_scp, rx_sc->next);
1384 return rx_sc;
1385 }
1386 }
1387
1388 return NULL;
1389}
1390
1391static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1392{
1393 struct macsec_rx_sc *rx_sc;
1394 struct macsec_dev *macsec;
1395 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1396 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1397 struct macsec_secy *secy;
1398
1399 list_for_each_entry(macsec, &rxd->secys, secys) {
1400 if (find_rx_sc_rtnl(&macsec->secy, sci))
1401 return ERR_PTR(-EEXIST);
1402 }
1403
1404 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1405 if (!rx_sc)
1406 return ERR_PTR(-ENOMEM);
1407
1408 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1409 if (!rx_sc->stats) {
1410 kfree(rx_sc);
1411 return ERR_PTR(-ENOMEM);
1412 }
1413
1414 rx_sc->sci = sci;
1415 rx_sc->active = true;
1416 refcount_set(&rx_sc->refcnt, 1);
1417
1418 secy = &macsec_priv(dev)->secy;
1419 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1420 rcu_assign_pointer(secy->rx_sc, rx_sc);
1421
1422 if (rx_sc->active)
1423 secy->n_rx_sc++;
1424
1425 return rx_sc;
1426}
1427
1428static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1429 int icv_len)
1430{
1431 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1432 if (!tx_sa->stats)
1433 return -ENOMEM;
1434
1435 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1436 if (IS_ERR(tx_sa->key.tfm)) {
1437 free_percpu(tx_sa->stats);
1438 return PTR_ERR(tx_sa->key.tfm);
1439 }
1440
1441 tx_sa->active = false;
1442 refcount_set(&tx_sa->refcnt, 1);
1443 spin_lock_init(&tx_sa->lock);
1444
1445 return 0;
1446}
1447
1448static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1449{
1450 tx_sa->active = false;
1451
1452 macsec_txsa_put(tx_sa);
1453}
1454
1455static struct genl_family macsec_fam;
1456
1457static struct net_device *get_dev_from_nl(struct net *net,
1458 struct nlattr **attrs)
1459{
1460 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1461 struct net_device *dev;
1462
1463 dev = __dev_get_by_index(net, ifindex);
1464 if (!dev)
1465 return ERR_PTR(-ENODEV);
1466
1467 if (!netif_is_macsec(dev))
1468 return ERR_PTR(-ENODEV);
1469
1470 return dev;
1471}
1472
1473static sci_t nla_get_sci(const struct nlattr *nla)
1474{
1475 return (__force sci_t)nla_get_u64(nla);
1476}
1477
1478static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1479 int padattr)
1480{
1481 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1482}
1483
1484static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1485 struct nlattr **attrs,
1486 struct nlattr **tb_sa,
1487 struct net_device **devp,
1488 struct macsec_secy **secyp,
1489 struct macsec_tx_sc **scp,
1490 u8 *assoc_num)
1491{
1492 struct net_device *dev;
1493 struct macsec_secy *secy;
1494 struct macsec_tx_sc *tx_sc;
1495 struct macsec_tx_sa *tx_sa;
1496
1497 if (!tb_sa[MACSEC_SA_ATTR_AN])
1498 return ERR_PTR(-EINVAL);
1499
1500 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1501
1502 dev = get_dev_from_nl(net, attrs);
1503 if (IS_ERR(dev))
1504 return ERR_CAST(dev);
1505
1506 if (*assoc_num >= MACSEC_NUM_AN)
1507 return ERR_PTR(-EINVAL);
1508
1509 secy = &macsec_priv(dev)->secy;
1510 tx_sc = &secy->tx_sc;
1511
1512 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1513 if (!tx_sa)
1514 return ERR_PTR(-ENODEV);
1515
1516 *devp = dev;
1517 *scp = tx_sc;
1518 *secyp = secy;
1519 return tx_sa;
1520}
1521
1522static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1523 struct nlattr **attrs,
1524 struct nlattr **tb_rxsc,
1525 struct net_device **devp,
1526 struct macsec_secy **secyp)
1527{
1528 struct net_device *dev;
1529 struct macsec_secy *secy;
1530 struct macsec_rx_sc *rx_sc;
1531 sci_t sci;
1532
1533 dev = get_dev_from_nl(net, attrs);
1534 if (IS_ERR(dev))
1535 return ERR_CAST(dev);
1536
1537 secy = &macsec_priv(dev)->secy;
1538
1539 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1540 return ERR_PTR(-EINVAL);
1541
1542 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1543 rx_sc = find_rx_sc_rtnl(secy, sci);
1544 if (!rx_sc)
1545 return ERR_PTR(-ENODEV);
1546
1547 *secyp = secy;
1548 *devp = dev;
1549
1550 return rx_sc;
1551}
1552
1553static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1554 struct nlattr **attrs,
1555 struct nlattr **tb_rxsc,
1556 struct nlattr **tb_sa,
1557 struct net_device **devp,
1558 struct macsec_secy **secyp,
1559 struct macsec_rx_sc **scp,
1560 u8 *assoc_num)
1561{
1562 struct macsec_rx_sc *rx_sc;
1563 struct macsec_rx_sa *rx_sa;
1564
1565 if (!tb_sa[MACSEC_SA_ATTR_AN])
1566 return ERR_PTR(-EINVAL);
1567
1568 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1569 if (*assoc_num >= MACSEC_NUM_AN)
1570 return ERR_PTR(-EINVAL);
1571
1572 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1573 if (IS_ERR(rx_sc))
1574 return ERR_CAST(rx_sc);
1575
1576 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1577 if (!rx_sa)
1578 return ERR_PTR(-ENODEV);
1579
1580 *scp = rx_sc;
1581 return rx_sa;
1582}
1583
1584static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1585 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1586 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1587 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1588};
1589
1590static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1591 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1592 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1593};
1594
1595static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1596 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1597 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1598 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1599 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1600 .len = MACSEC_KEYID_LEN, },
1601 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1602 .len = MACSEC_MAX_KEY_LEN, },
1603};
1604
1605static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1606{
1607 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1608 return -EINVAL;
1609
1610 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1611 return -EINVAL;
1612
1613 return 0;
1614}
1615
1616static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1617{
1618 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1619 return -EINVAL;
1620
1621 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1622 return -EINVAL;
1623
1624 return 0;
1625}
1626
1627static bool validate_add_rxsa(struct nlattr **attrs)
1628{
1629 if (!attrs[MACSEC_SA_ATTR_AN] ||
1630 !attrs[MACSEC_SA_ATTR_KEY] ||
1631 !attrs[MACSEC_SA_ATTR_KEYID])
1632 return false;
1633
1634 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1635 return false;
1636
1637 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1638 return false;
1639
1640 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1641 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1642 return false;
1643 }
1644
1645 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1646 return false;
1647
1648 return true;
1649}
1650
1651static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1652{
1653 struct net_device *dev;
1654 struct nlattr **attrs = info->attrs;
1655 struct macsec_secy *secy;
1656 struct macsec_rx_sc *rx_sc;
1657 struct macsec_rx_sa *rx_sa;
1658 unsigned char assoc_num;
1659 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1660 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1661 int err;
1662
1663 if (!attrs[MACSEC_ATTR_IFINDEX])
1664 return -EINVAL;
1665
1666 if (parse_sa_config(attrs, tb_sa))
1667 return -EINVAL;
1668
1669 if (parse_rxsc_config(attrs, tb_rxsc))
1670 return -EINVAL;
1671
1672 if (!validate_add_rxsa(tb_sa))
1673 return -EINVAL;
1674
1675 rtnl_lock();
1676 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1677 if (IS_ERR(rx_sc)) {
1678 rtnl_unlock();
1679 return PTR_ERR(rx_sc);
1680 }
1681
1682 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1683
1684 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1685 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1686 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1687 rtnl_unlock();
1688 return -EINVAL;
1689 }
1690
1691 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1692 if (rx_sa) {
1693 rtnl_unlock();
1694 return -EBUSY;
1695 }
1696
1697 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1698 if (!rx_sa) {
1699 rtnl_unlock();
1700 return -ENOMEM;
1701 }
1702
1703 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1704 secy->key_len, secy->icv_len);
1705 if (err < 0) {
1706 kfree(rx_sa);
1707 rtnl_unlock();
1708 return err;
1709 }
1710
1711 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1712 spin_lock_bh(&rx_sa->lock);
1713 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1714 spin_unlock_bh(&rx_sa->lock);
1715 }
1716
1717 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1718 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1719
1720 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1721 rx_sa->sc = rx_sc;
1722 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1723
1724 rtnl_unlock();
1725
1726 return 0;
1727}
1728
1729static bool validate_add_rxsc(struct nlattr **attrs)
1730{
1731 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1732 return false;
1733
1734 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1735 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1736 return false;
1737 }
1738
1739 return true;
1740}
1741
1742static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1743{
1744 struct net_device *dev;
1745 sci_t sci = MACSEC_UNDEF_SCI;
1746 struct nlattr **attrs = info->attrs;
1747 struct macsec_rx_sc *rx_sc;
1748 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1749
1750 if (!attrs[MACSEC_ATTR_IFINDEX])
1751 return -EINVAL;
1752
1753 if (parse_rxsc_config(attrs, tb_rxsc))
1754 return -EINVAL;
1755
1756 if (!validate_add_rxsc(tb_rxsc))
1757 return -EINVAL;
1758
1759 rtnl_lock();
1760 dev = get_dev_from_nl(genl_info_net(info), attrs);
1761 if (IS_ERR(dev)) {
1762 rtnl_unlock();
1763 return PTR_ERR(dev);
1764 }
1765
1766 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1767
1768 rx_sc = create_rx_sc(dev, sci);
1769 if (IS_ERR(rx_sc)) {
1770 rtnl_unlock();
1771 return PTR_ERR(rx_sc);
1772 }
1773
1774 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1775 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1776
1777 rtnl_unlock();
1778
1779 return 0;
1780}
1781
1782static bool validate_add_txsa(struct nlattr **attrs)
1783{
1784 if (!attrs[MACSEC_SA_ATTR_AN] ||
1785 !attrs[MACSEC_SA_ATTR_PN] ||
1786 !attrs[MACSEC_SA_ATTR_KEY] ||
1787 !attrs[MACSEC_SA_ATTR_KEYID])
1788 return false;
1789
1790 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1791 return false;
1792
1793 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1794 return false;
1795
1796 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1797 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1798 return false;
1799 }
1800
1801 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1802 return false;
1803
1804 return true;
1805}
1806
1807static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1808{
1809 struct net_device *dev;
1810 struct nlattr **attrs = info->attrs;
1811 struct macsec_secy *secy;
1812 struct macsec_tx_sc *tx_sc;
1813 struct macsec_tx_sa *tx_sa;
1814 unsigned char assoc_num;
1815 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1816 int err;
1817
1818 if (!attrs[MACSEC_ATTR_IFINDEX])
1819 return -EINVAL;
1820
1821 if (parse_sa_config(attrs, tb_sa))
1822 return -EINVAL;
1823
1824 if (!validate_add_txsa(tb_sa))
1825 return -EINVAL;
1826
1827 rtnl_lock();
1828 dev = get_dev_from_nl(genl_info_net(info), attrs);
1829 if (IS_ERR(dev)) {
1830 rtnl_unlock();
1831 return PTR_ERR(dev);
1832 }
1833
1834 secy = &macsec_priv(dev)->secy;
1835 tx_sc = &secy->tx_sc;
1836
1837 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1838
1839 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1840 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1841 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1842 rtnl_unlock();
1843 return -EINVAL;
1844 }
1845
1846 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1847 if (tx_sa) {
1848 rtnl_unlock();
1849 return -EBUSY;
1850 }
1851
1852 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1853 if (!tx_sa) {
1854 rtnl_unlock();
1855 return -ENOMEM;
1856 }
1857
1858 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1859 secy->key_len, secy->icv_len);
1860 if (err < 0) {
1861 kfree(tx_sa);
1862 rtnl_unlock();
1863 return err;
1864 }
1865
1866 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1867
1868 spin_lock_bh(&tx_sa->lock);
1869 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1870 spin_unlock_bh(&tx_sa->lock);
1871
1872 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1873 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1874
1875 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1876 secy->operational = true;
1877
1878 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1879
1880 rtnl_unlock();
1881
1882 return 0;
1883}
1884
1885static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1886{
1887 struct nlattr **attrs = info->attrs;
1888 struct net_device *dev;
1889 struct macsec_secy *secy;
1890 struct macsec_rx_sc *rx_sc;
1891 struct macsec_rx_sa *rx_sa;
1892 u8 assoc_num;
1893 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1894 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1895
1896 if (!attrs[MACSEC_ATTR_IFINDEX])
1897 return -EINVAL;
1898
1899 if (parse_sa_config(attrs, tb_sa))
1900 return -EINVAL;
1901
1902 if (parse_rxsc_config(attrs, tb_rxsc))
1903 return -EINVAL;
1904
1905 rtnl_lock();
1906 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1907 &dev, &secy, &rx_sc, &assoc_num);
1908 if (IS_ERR(rx_sa)) {
1909 rtnl_unlock();
1910 return PTR_ERR(rx_sa);
1911 }
1912
1913 if (rx_sa->active) {
1914 rtnl_unlock();
1915 return -EBUSY;
1916 }
1917
1918 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1919 clear_rx_sa(rx_sa);
1920
1921 rtnl_unlock();
1922
1923 return 0;
1924}
1925
1926static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1927{
1928 struct nlattr **attrs = info->attrs;
1929 struct net_device *dev;
1930 struct macsec_secy *secy;
1931 struct macsec_rx_sc *rx_sc;
1932 sci_t sci;
1933 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1934
1935 if (!attrs[MACSEC_ATTR_IFINDEX])
1936 return -EINVAL;
1937
1938 if (parse_rxsc_config(attrs, tb_rxsc))
1939 return -EINVAL;
1940
1941 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1942 return -EINVAL;
1943
1944 rtnl_lock();
1945 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1946 if (IS_ERR(dev)) {
1947 rtnl_unlock();
1948 return PTR_ERR(dev);
1949 }
1950
1951 secy = &macsec_priv(dev)->secy;
1952 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1953
1954 rx_sc = del_rx_sc(secy, sci);
1955 if (!rx_sc) {
1956 rtnl_unlock();
1957 return -ENODEV;
1958 }
1959
1960 free_rx_sc(rx_sc);
1961 rtnl_unlock();
1962
1963 return 0;
1964}
1965
1966static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1967{
1968 struct nlattr **attrs = info->attrs;
1969 struct net_device *dev;
1970 struct macsec_secy *secy;
1971 struct macsec_tx_sc *tx_sc;
1972 struct macsec_tx_sa *tx_sa;
1973 u8 assoc_num;
1974 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1975
1976 if (!attrs[MACSEC_ATTR_IFINDEX])
1977 return -EINVAL;
1978
1979 if (parse_sa_config(attrs, tb_sa))
1980 return -EINVAL;
1981
1982 rtnl_lock();
1983 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1984 &dev, &secy, &tx_sc, &assoc_num);
1985 if (IS_ERR(tx_sa)) {
1986 rtnl_unlock();
1987 return PTR_ERR(tx_sa);
1988 }
1989
1990 if (tx_sa->active) {
1991 rtnl_unlock();
1992 return -EBUSY;
1993 }
1994
1995 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1996 clear_tx_sa(tx_sa);
1997
1998 rtnl_unlock();
1999
2000 return 0;
2001}
2002
2003static bool validate_upd_sa(struct nlattr **attrs)
2004{
2005 if (!attrs[MACSEC_SA_ATTR_AN] ||
2006 attrs[MACSEC_SA_ATTR_KEY] ||
2007 attrs[MACSEC_SA_ATTR_KEYID])
2008 return false;
2009
2010 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2011 return false;
2012
2013 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2014 return false;
2015
2016 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2017 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2018 return false;
2019 }
2020
2021 return true;
2022}
2023
2024static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2025{
2026 struct nlattr **attrs = info->attrs;
2027 struct net_device *dev;
2028 struct macsec_secy *secy;
2029 struct macsec_tx_sc *tx_sc;
2030 struct macsec_tx_sa *tx_sa;
2031 u8 assoc_num;
2032 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2033
2034 if (!attrs[MACSEC_ATTR_IFINDEX])
2035 return -EINVAL;
2036
2037 if (parse_sa_config(attrs, tb_sa))
2038 return -EINVAL;
2039
2040 if (!validate_upd_sa(tb_sa))
2041 return -EINVAL;
2042
2043 rtnl_lock();
2044 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2045 &dev, &secy, &tx_sc, &assoc_num);
2046 if (IS_ERR(tx_sa)) {
2047 rtnl_unlock();
2048 return PTR_ERR(tx_sa);
2049 }
2050
2051 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2052 spin_lock_bh(&tx_sa->lock);
2053 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2054 spin_unlock_bh(&tx_sa->lock);
2055 }
2056
2057 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2058 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2059
2060 if (assoc_num == tx_sc->encoding_sa)
2061 secy->operational = tx_sa->active;
2062
2063 rtnl_unlock();
2064
2065 return 0;
2066}
2067
2068static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2069{
2070 struct nlattr **attrs = info->attrs;
2071 struct net_device *dev;
2072 struct macsec_secy *secy;
2073 struct macsec_rx_sc *rx_sc;
2074 struct macsec_rx_sa *rx_sa;
2075 u8 assoc_num;
2076 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2077 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2078
2079 if (!attrs[MACSEC_ATTR_IFINDEX])
2080 return -EINVAL;
2081
2082 if (parse_rxsc_config(attrs, tb_rxsc))
2083 return -EINVAL;
2084
2085 if (parse_sa_config(attrs, tb_sa))
2086 return -EINVAL;
2087
2088 if (!validate_upd_sa(tb_sa))
2089 return -EINVAL;
2090
2091 rtnl_lock();
2092 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2093 &dev, &secy, &rx_sc, &assoc_num);
2094 if (IS_ERR(rx_sa)) {
2095 rtnl_unlock();
2096 return PTR_ERR(rx_sa);
2097 }
2098
2099 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2100 spin_lock_bh(&rx_sa->lock);
2101 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2102 spin_unlock_bh(&rx_sa->lock);
2103 }
2104
2105 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2106 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2107
2108 rtnl_unlock();
2109 return 0;
2110}
2111
2112static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2113{
2114 struct nlattr **attrs = info->attrs;
2115 struct net_device *dev;
2116 struct macsec_secy *secy;
2117 struct macsec_rx_sc *rx_sc;
2118 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2119
2120 if (!attrs[MACSEC_ATTR_IFINDEX])
2121 return -EINVAL;
2122
2123 if (parse_rxsc_config(attrs, tb_rxsc))
2124 return -EINVAL;
2125
2126 if (!validate_add_rxsc(tb_rxsc))
2127 return -EINVAL;
2128
2129 rtnl_lock();
2130 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2131 if (IS_ERR(rx_sc)) {
2132 rtnl_unlock();
2133 return PTR_ERR(rx_sc);
2134 }
2135
2136 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2137 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2138
2139 if (rx_sc->active != new)
2140 secy->n_rx_sc += new ? 1 : -1;
2141
2142 rx_sc->active = new;
2143 }
2144
2145 rtnl_unlock();
2146
2147 return 0;
2148}
2149
2150static int copy_tx_sa_stats(struct sk_buff *skb,
2151 struct macsec_tx_sa_stats __percpu *pstats)
2152{
2153 struct macsec_tx_sa_stats sum = {0, };
2154 int cpu;
2155
2156 for_each_possible_cpu(cpu) {
2157 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2158
2159 sum.OutPktsProtected += stats->OutPktsProtected;
2160 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2161 }
2162
2163 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2164 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2165 return -EMSGSIZE;
2166
2167 return 0;
2168}
2169
2170static noinline_for_stack int
2171copy_rx_sa_stats(struct sk_buff *skb,
2172 struct macsec_rx_sa_stats __percpu *pstats)
2173{
2174 struct macsec_rx_sa_stats sum = {0, };
2175 int cpu;
2176
2177 for_each_possible_cpu(cpu) {
2178 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2179
2180 sum.InPktsOK += stats->InPktsOK;
2181 sum.InPktsInvalid += stats->InPktsInvalid;
2182 sum.InPktsNotValid += stats->InPktsNotValid;
2183 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2184 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2185 }
2186
2187 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2188 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2189 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2190 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2191 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2192 return -EMSGSIZE;
2193
2194 return 0;
2195}
2196
2197static noinline_for_stack int
2198copy_rx_sc_stats(struct sk_buff *skb, struct pcpu_rx_sc_stats __percpu *pstats)
2199{
2200 struct macsec_rx_sc_stats sum = {0, };
2201 int cpu;
2202
2203 for_each_possible_cpu(cpu) {
2204 const struct pcpu_rx_sc_stats *stats;
2205 struct macsec_rx_sc_stats tmp;
2206 unsigned int start;
2207
2208 stats = per_cpu_ptr(pstats, cpu);
2209 do {
2210 start = u64_stats_fetch_begin_irq(&stats->syncp);
2211 memcpy(&tmp, &stats->stats, sizeof(tmp));
2212 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2213
2214 sum.InOctetsValidated += tmp.InOctetsValidated;
2215 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2216 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2217 sum.InPktsDelayed += tmp.InPktsDelayed;
2218 sum.InPktsOK += tmp.InPktsOK;
2219 sum.InPktsInvalid += tmp.InPktsInvalid;
2220 sum.InPktsLate += tmp.InPktsLate;
2221 sum.InPktsNotValid += tmp.InPktsNotValid;
2222 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2223 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2224 }
2225
2226 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2227 sum.InOctetsValidated,
2228 MACSEC_RXSC_STATS_ATTR_PAD) ||
2229 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2230 sum.InOctetsDecrypted,
2231 MACSEC_RXSC_STATS_ATTR_PAD) ||
2232 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2233 sum.InPktsUnchecked,
2234 MACSEC_RXSC_STATS_ATTR_PAD) ||
2235 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2236 sum.InPktsDelayed,
2237 MACSEC_RXSC_STATS_ATTR_PAD) ||
2238 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2239 sum.InPktsOK,
2240 MACSEC_RXSC_STATS_ATTR_PAD) ||
2241 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2242 sum.InPktsInvalid,
2243 MACSEC_RXSC_STATS_ATTR_PAD) ||
2244 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2245 sum.InPktsLate,
2246 MACSEC_RXSC_STATS_ATTR_PAD) ||
2247 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2248 sum.InPktsNotValid,
2249 MACSEC_RXSC_STATS_ATTR_PAD) ||
2250 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2251 sum.InPktsNotUsingSA,
2252 MACSEC_RXSC_STATS_ATTR_PAD) ||
2253 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2254 sum.InPktsUnusedSA,
2255 MACSEC_RXSC_STATS_ATTR_PAD))
2256 return -EMSGSIZE;
2257
2258 return 0;
2259}
2260
2261static noinline_for_stack int
2262copy_tx_sc_stats(struct sk_buff *skb, struct pcpu_tx_sc_stats __percpu *pstats)
2263{
2264 struct macsec_tx_sc_stats sum = {0, };
2265 int cpu;
2266
2267 for_each_possible_cpu(cpu) {
2268 const struct pcpu_tx_sc_stats *stats;
2269 struct macsec_tx_sc_stats tmp;
2270 unsigned int start;
2271
2272 stats = per_cpu_ptr(pstats, cpu);
2273 do {
2274 start = u64_stats_fetch_begin_irq(&stats->syncp);
2275 memcpy(&tmp, &stats->stats, sizeof(tmp));
2276 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2277
2278 sum.OutPktsProtected += tmp.OutPktsProtected;
2279 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2280 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2281 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2282 }
2283
2284 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2285 sum.OutPktsProtected,
2286 MACSEC_TXSC_STATS_ATTR_PAD) ||
2287 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2288 sum.OutPktsEncrypted,
2289 MACSEC_TXSC_STATS_ATTR_PAD) ||
2290 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2291 sum.OutOctetsProtected,
2292 MACSEC_TXSC_STATS_ATTR_PAD) ||
2293 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2294 sum.OutOctetsEncrypted,
2295 MACSEC_TXSC_STATS_ATTR_PAD))
2296 return -EMSGSIZE;
2297
2298 return 0;
2299}
2300
2301static noinline_for_stack int
2302copy_secy_stats(struct sk_buff *skb, struct pcpu_secy_stats __percpu *pstats)
2303{
2304 struct macsec_dev_stats sum = {0, };
2305 int cpu;
2306
2307 for_each_possible_cpu(cpu) {
2308 const struct pcpu_secy_stats *stats;
2309 struct macsec_dev_stats tmp;
2310 unsigned int start;
2311
2312 stats = per_cpu_ptr(pstats, cpu);
2313 do {
2314 start = u64_stats_fetch_begin_irq(&stats->syncp);
2315 memcpy(&tmp, &stats->stats, sizeof(tmp));
2316 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2317
2318 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2319 sum.InPktsUntagged += tmp.InPktsUntagged;
2320 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2321 sum.InPktsNoTag += tmp.InPktsNoTag;
2322 sum.InPktsBadTag += tmp.InPktsBadTag;
2323 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2324 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2325 sum.InPktsOverrun += tmp.InPktsOverrun;
2326 }
2327
2328 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2329 sum.OutPktsUntagged,
2330 MACSEC_SECY_STATS_ATTR_PAD) ||
2331 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2332 sum.InPktsUntagged,
2333 MACSEC_SECY_STATS_ATTR_PAD) ||
2334 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2335 sum.OutPktsTooLong,
2336 MACSEC_SECY_STATS_ATTR_PAD) ||
2337 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2338 sum.InPktsNoTag,
2339 MACSEC_SECY_STATS_ATTR_PAD) ||
2340 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2341 sum.InPktsBadTag,
2342 MACSEC_SECY_STATS_ATTR_PAD) ||
2343 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2344 sum.InPktsUnknownSCI,
2345 MACSEC_SECY_STATS_ATTR_PAD) ||
2346 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2347 sum.InPktsNoSCI,
2348 MACSEC_SECY_STATS_ATTR_PAD) ||
2349 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2350 sum.InPktsOverrun,
2351 MACSEC_SECY_STATS_ATTR_PAD))
2352 return -EMSGSIZE;
2353
2354 return 0;
2355}
2356
2357static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2358{
2359 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2360 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2361 MACSEC_ATTR_SECY);
2362 u64 csid;
2363
2364 if (!secy_nest)
2365 return 1;
2366
2367 switch (secy->key_len) {
2368 case MACSEC_GCM_AES_128_SAK_LEN:
2369 csid = MACSEC_DEFAULT_CIPHER_ID;
2370 break;
2371 case MACSEC_GCM_AES_256_SAK_LEN:
2372 csid = MACSEC_CIPHER_ID_GCM_AES_256;
2373 break;
2374 default:
2375 goto cancel;
2376 }
2377
2378 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2379 MACSEC_SECY_ATTR_PAD) ||
2380 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2381 csid, MACSEC_SECY_ATTR_PAD) ||
2382 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2383 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2384 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2385 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2386 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2387 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2388 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2389 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2390 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2391 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2392 goto cancel;
2393
2394 if (secy->replay_protect) {
2395 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2396 goto cancel;
2397 }
2398
2399 nla_nest_end(skb, secy_nest);
2400 return 0;
2401
2402cancel:
2403 nla_nest_cancel(skb, secy_nest);
2404 return 1;
2405}
2406
2407static noinline_for_stack int
2408dump_secy(struct macsec_secy *secy, struct net_device *dev,
2409 struct sk_buff *skb, struct netlink_callback *cb)
2410{
2411 struct macsec_rx_sc *rx_sc;
2412 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2413 struct nlattr *txsa_list, *rxsc_list;
2414 int i, j;
2415 void *hdr;
2416 struct nlattr *attr;
2417
2418 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2419 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2420 if (!hdr)
2421 return -EMSGSIZE;
2422
2423 genl_dump_check_consistent(cb, hdr);
2424
2425 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2426 goto nla_put_failure;
2427
2428 if (nla_put_secy(secy, skb))
2429 goto nla_put_failure;
2430
2431 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
2432 if (!attr)
2433 goto nla_put_failure;
2434 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2435 nla_nest_cancel(skb, attr);
2436 goto nla_put_failure;
2437 }
2438 nla_nest_end(skb, attr);
2439
2440 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
2441 if (!attr)
2442 goto nla_put_failure;
2443 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2444 nla_nest_cancel(skb, attr);
2445 goto nla_put_failure;
2446 }
2447 nla_nest_end(skb, attr);
2448
2449 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
2450 if (!txsa_list)
2451 goto nla_put_failure;
2452 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2453 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2454 struct nlattr *txsa_nest;
2455
2456 if (!tx_sa)
2457 continue;
2458
2459 txsa_nest = nla_nest_start_noflag(skb, j++);
2460 if (!txsa_nest) {
2461 nla_nest_cancel(skb, txsa_list);
2462 goto nla_put_failure;
2463 }
2464
2465 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2466 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2467 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2468 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2469 nla_nest_cancel(skb, txsa_nest);
2470 nla_nest_cancel(skb, txsa_list);
2471 goto nla_put_failure;
2472 }
2473
2474 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
2475 if (!attr) {
2476 nla_nest_cancel(skb, txsa_nest);
2477 nla_nest_cancel(skb, txsa_list);
2478 goto nla_put_failure;
2479 }
2480 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2481 nla_nest_cancel(skb, attr);
2482 nla_nest_cancel(skb, txsa_nest);
2483 nla_nest_cancel(skb, txsa_list);
2484 goto nla_put_failure;
2485 }
2486 nla_nest_end(skb, attr);
2487
2488 nla_nest_end(skb, txsa_nest);
2489 }
2490 nla_nest_end(skb, txsa_list);
2491
2492 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
2493 if (!rxsc_list)
2494 goto nla_put_failure;
2495
2496 j = 1;
2497 for_each_rxsc_rtnl(secy, rx_sc) {
2498 int k;
2499 struct nlattr *rxsa_list;
2500 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
2501
2502 if (!rxsc_nest) {
2503 nla_nest_cancel(skb, rxsc_list);
2504 goto nla_put_failure;
2505 }
2506
2507 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2508 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2509 MACSEC_RXSC_ATTR_PAD)) {
2510 nla_nest_cancel(skb, rxsc_nest);
2511 nla_nest_cancel(skb, rxsc_list);
2512 goto nla_put_failure;
2513 }
2514
2515 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
2516 if (!attr) {
2517 nla_nest_cancel(skb, rxsc_nest);
2518 nla_nest_cancel(skb, rxsc_list);
2519 goto nla_put_failure;
2520 }
2521 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2522 nla_nest_cancel(skb, attr);
2523 nla_nest_cancel(skb, rxsc_nest);
2524 nla_nest_cancel(skb, rxsc_list);
2525 goto nla_put_failure;
2526 }
2527 nla_nest_end(skb, attr);
2528
2529 rxsa_list = nla_nest_start_noflag(skb,
2530 MACSEC_RXSC_ATTR_SA_LIST);
2531 if (!rxsa_list) {
2532 nla_nest_cancel(skb, rxsc_nest);
2533 nla_nest_cancel(skb, rxsc_list);
2534 goto nla_put_failure;
2535 }
2536
2537 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2538 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2539 struct nlattr *rxsa_nest;
2540
2541 if (!rx_sa)
2542 continue;
2543
2544 rxsa_nest = nla_nest_start_noflag(skb, k++);
2545 if (!rxsa_nest) {
2546 nla_nest_cancel(skb, rxsa_list);
2547 nla_nest_cancel(skb, rxsc_nest);
2548 nla_nest_cancel(skb, rxsc_list);
2549 goto nla_put_failure;
2550 }
2551
2552 attr = nla_nest_start_noflag(skb,
2553 MACSEC_SA_ATTR_STATS);
2554 if (!attr) {
2555 nla_nest_cancel(skb, rxsa_list);
2556 nla_nest_cancel(skb, rxsc_nest);
2557 nla_nest_cancel(skb, rxsc_list);
2558 goto nla_put_failure;
2559 }
2560 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2561 nla_nest_cancel(skb, attr);
2562 nla_nest_cancel(skb, rxsa_list);
2563 nla_nest_cancel(skb, rxsc_nest);
2564 nla_nest_cancel(skb, rxsc_list);
2565 goto nla_put_failure;
2566 }
2567 nla_nest_end(skb, attr);
2568
2569 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2570 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2571 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2572 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2573 nla_nest_cancel(skb, rxsa_nest);
2574 nla_nest_cancel(skb, rxsc_nest);
2575 nla_nest_cancel(skb, rxsc_list);
2576 goto nla_put_failure;
2577 }
2578 nla_nest_end(skb, rxsa_nest);
2579 }
2580
2581 nla_nest_end(skb, rxsa_list);
2582 nla_nest_end(skb, rxsc_nest);
2583 }
2584
2585 nla_nest_end(skb, rxsc_list);
2586
2587 genlmsg_end(skb, hdr);
2588
2589 return 0;
2590
2591nla_put_failure:
2592 genlmsg_cancel(skb, hdr);
2593 return -EMSGSIZE;
2594}
2595
2596static int macsec_generation = 1; /* protected by RTNL */
2597
2598static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2599{
2600 struct net *net = sock_net(skb->sk);
2601 struct net_device *dev;
2602 int dev_idx, d;
2603
2604 dev_idx = cb->args[0];
2605
2606 d = 0;
2607 rtnl_lock();
2608
2609 cb->seq = macsec_generation;
2610
2611 for_each_netdev(net, dev) {
2612 struct macsec_secy *secy;
2613
2614 if (d < dev_idx)
2615 goto next;
2616
2617 if (!netif_is_macsec(dev))
2618 goto next;
2619
2620 secy = &macsec_priv(dev)->secy;
2621 if (dump_secy(secy, dev, skb, cb) < 0)
2622 goto done;
2623next:
2624 d++;
2625 }
2626
2627done:
2628 rtnl_unlock();
2629 cb->args[0] = d;
2630 return skb->len;
2631}
2632
2633static const struct genl_ops macsec_genl_ops[] = {
2634 {
2635 .cmd = MACSEC_CMD_GET_TXSC,
2636 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2637 .dumpit = macsec_dump_txsc,
2638 },
2639 {
2640 .cmd = MACSEC_CMD_ADD_RXSC,
2641 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2642 .doit = macsec_add_rxsc,
2643 .flags = GENL_ADMIN_PERM,
2644 },
2645 {
2646 .cmd = MACSEC_CMD_DEL_RXSC,
2647 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2648 .doit = macsec_del_rxsc,
2649 .flags = GENL_ADMIN_PERM,
2650 },
2651 {
2652 .cmd = MACSEC_CMD_UPD_RXSC,
2653 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2654 .doit = macsec_upd_rxsc,
2655 .flags = GENL_ADMIN_PERM,
2656 },
2657 {
2658 .cmd = MACSEC_CMD_ADD_TXSA,
2659 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2660 .doit = macsec_add_txsa,
2661 .flags = GENL_ADMIN_PERM,
2662 },
2663 {
2664 .cmd = MACSEC_CMD_DEL_TXSA,
2665 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2666 .doit = macsec_del_txsa,
2667 .flags = GENL_ADMIN_PERM,
2668 },
2669 {
2670 .cmd = MACSEC_CMD_UPD_TXSA,
2671 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2672 .doit = macsec_upd_txsa,
2673 .flags = GENL_ADMIN_PERM,
2674 },
2675 {
2676 .cmd = MACSEC_CMD_ADD_RXSA,
2677 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2678 .doit = macsec_add_rxsa,
2679 .flags = GENL_ADMIN_PERM,
2680 },
2681 {
2682 .cmd = MACSEC_CMD_DEL_RXSA,
2683 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2684 .doit = macsec_del_rxsa,
2685 .flags = GENL_ADMIN_PERM,
2686 },
2687 {
2688 .cmd = MACSEC_CMD_UPD_RXSA,
2689 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2690 .doit = macsec_upd_rxsa,
2691 .flags = GENL_ADMIN_PERM,
2692 },
2693};
2694
2695static struct genl_family macsec_fam __ro_after_init = {
2696 .name = MACSEC_GENL_NAME,
2697 .hdrsize = 0,
2698 .version = MACSEC_GENL_VERSION,
2699 .maxattr = MACSEC_ATTR_MAX,
2700 .policy = macsec_genl_policy,
2701 .netnsok = true,
2702 .module = THIS_MODULE,
2703 .ops = macsec_genl_ops,
2704 .n_ops = ARRAY_SIZE(macsec_genl_ops),
2705};
2706
2707static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2708 struct net_device *dev)
2709{
2710 struct macsec_dev *macsec = netdev_priv(dev);
2711 struct macsec_secy *secy = &macsec->secy;
2712 struct pcpu_secy_stats *secy_stats;
2713 int ret, len;
2714
2715 /* 10.5 */
2716 if (!secy->protect_frames) {
2717 secy_stats = this_cpu_ptr(macsec->stats);
2718 u64_stats_update_begin(&secy_stats->syncp);
2719 secy_stats->stats.OutPktsUntagged++;
2720 u64_stats_update_end(&secy_stats->syncp);
2721 skb->dev = macsec->real_dev;
2722 len = skb->len;
2723 ret = dev_queue_xmit(skb);
2724 count_tx(dev, ret, len);
2725 return ret;
2726 }
2727
2728 if (!secy->operational) {
2729 kfree_skb(skb);
2730 dev->stats.tx_dropped++;
2731 return NETDEV_TX_OK;
2732 }
2733
2734 skb = macsec_encrypt(skb, dev);
2735 if (IS_ERR(skb)) {
2736 if (PTR_ERR(skb) != -EINPROGRESS)
2737 dev->stats.tx_dropped++;
2738 return NETDEV_TX_OK;
2739 }
2740
2741 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2742
2743 macsec_encrypt_finish(skb, dev);
2744 len = skb->len;
2745 ret = dev_queue_xmit(skb);
2746 count_tx(dev, ret, len);
2747 return ret;
2748}
2749
2750#define MACSEC_FEATURES \
2751 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2752
2753static int macsec_dev_init(struct net_device *dev)
2754{
2755 struct macsec_dev *macsec = macsec_priv(dev);
2756 struct net_device *real_dev = macsec->real_dev;
2757 int err;
2758
2759 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2760 if (!dev->tstats)
2761 return -ENOMEM;
2762
2763 err = gro_cells_init(&macsec->gro_cells, dev);
2764 if (err) {
2765 free_percpu(dev->tstats);
2766 return err;
2767 }
2768
2769 dev->features = real_dev->features & MACSEC_FEATURES;
2770 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2771
2772 dev->needed_headroom = real_dev->needed_headroom +
2773 MACSEC_NEEDED_HEADROOM;
2774 dev->needed_tailroom = real_dev->needed_tailroom +
2775 MACSEC_NEEDED_TAILROOM;
2776
2777 if (is_zero_ether_addr(dev->dev_addr))
2778 eth_hw_addr_inherit(dev, real_dev);
2779 if (is_zero_ether_addr(dev->broadcast))
2780 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2781
2782 return 0;
2783}
2784
2785static void macsec_dev_uninit(struct net_device *dev)
2786{
2787 struct macsec_dev *macsec = macsec_priv(dev);
2788
2789 gro_cells_destroy(&macsec->gro_cells);
2790 free_percpu(dev->tstats);
2791}
2792
2793static netdev_features_t macsec_fix_features(struct net_device *dev,
2794 netdev_features_t features)
2795{
2796 struct macsec_dev *macsec = macsec_priv(dev);
2797 struct net_device *real_dev = macsec->real_dev;
2798
2799 features &= (real_dev->features & MACSEC_FEATURES) |
2800 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2801 features |= NETIF_F_LLTX;
2802
2803 return features;
2804}
2805
2806static int macsec_dev_open(struct net_device *dev)
2807{
2808 struct macsec_dev *macsec = macsec_priv(dev);
2809 struct net_device *real_dev = macsec->real_dev;
2810 int err;
2811
2812 err = dev_uc_add(real_dev, dev->dev_addr);
2813 if (err < 0)
2814 return err;
2815
2816 if (dev->flags & IFF_ALLMULTI) {
2817 err = dev_set_allmulti(real_dev, 1);
2818 if (err < 0)
2819 goto del_unicast;
2820 }
2821
2822 if (dev->flags & IFF_PROMISC) {
2823 err = dev_set_promiscuity(real_dev, 1);
2824 if (err < 0)
2825 goto clear_allmulti;
2826 }
2827
2828 if (netif_carrier_ok(real_dev))
2829 netif_carrier_on(dev);
2830
2831 return 0;
2832clear_allmulti:
2833 if (dev->flags & IFF_ALLMULTI)
2834 dev_set_allmulti(real_dev, -1);
2835del_unicast:
2836 dev_uc_del(real_dev, dev->dev_addr);
2837 netif_carrier_off(dev);
2838 return err;
2839}
2840
2841static int macsec_dev_stop(struct net_device *dev)
2842{
2843 struct macsec_dev *macsec = macsec_priv(dev);
2844 struct net_device *real_dev = macsec->real_dev;
2845
2846 netif_carrier_off(dev);
2847
2848 dev_mc_unsync(real_dev, dev);
2849 dev_uc_unsync(real_dev, dev);
2850
2851 if (dev->flags & IFF_ALLMULTI)
2852 dev_set_allmulti(real_dev, -1);
2853
2854 if (dev->flags & IFF_PROMISC)
2855 dev_set_promiscuity(real_dev, -1);
2856
2857 dev_uc_del(real_dev, dev->dev_addr);
2858
2859 return 0;
2860}
2861
2862static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2863{
2864 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2865
2866 if (!(dev->flags & IFF_UP))
2867 return;
2868
2869 if (change & IFF_ALLMULTI)
2870 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2871
2872 if (change & IFF_PROMISC)
2873 dev_set_promiscuity(real_dev,
2874 dev->flags & IFF_PROMISC ? 1 : -1);
2875}
2876
2877static void macsec_dev_set_rx_mode(struct net_device *dev)
2878{
2879 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2880
2881 dev_mc_sync(real_dev, dev);
2882 dev_uc_sync(real_dev, dev);
2883}
2884
2885static int macsec_set_mac_address(struct net_device *dev, void *p)
2886{
2887 struct macsec_dev *macsec = macsec_priv(dev);
2888 struct net_device *real_dev = macsec->real_dev;
2889 struct sockaddr *addr = p;
2890 int err;
2891
2892 if (!is_valid_ether_addr(addr->sa_data))
2893 return -EADDRNOTAVAIL;
2894
2895 if (!(dev->flags & IFF_UP))
2896 goto out;
2897
2898 err = dev_uc_add(real_dev, addr->sa_data);
2899 if (err < 0)
2900 return err;
2901
2902 dev_uc_del(real_dev, dev->dev_addr);
2903
2904out:
2905 ether_addr_copy(dev->dev_addr, addr->sa_data);
2906 return 0;
2907}
2908
2909static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2910{
2911 struct macsec_dev *macsec = macsec_priv(dev);
2912 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2913
2914 if (macsec->real_dev->mtu - extra < new_mtu)
2915 return -ERANGE;
2916
2917 dev->mtu = new_mtu;
2918
2919 return 0;
2920}
2921
2922static void macsec_get_stats64(struct net_device *dev,
2923 struct rtnl_link_stats64 *s)
2924{
2925 int cpu;
2926
2927 if (!dev->tstats)
2928 return;
2929
2930 for_each_possible_cpu(cpu) {
2931 struct pcpu_sw_netstats *stats;
2932 struct pcpu_sw_netstats tmp;
2933 int start;
2934
2935 stats = per_cpu_ptr(dev->tstats, cpu);
2936 do {
2937 start = u64_stats_fetch_begin_irq(&stats->syncp);
2938 tmp.rx_packets = stats->rx_packets;
2939 tmp.rx_bytes = stats->rx_bytes;
2940 tmp.tx_packets = stats->tx_packets;
2941 tmp.tx_bytes = stats->tx_bytes;
2942 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2943
2944 s->rx_packets += tmp.rx_packets;
2945 s->rx_bytes += tmp.rx_bytes;
2946 s->tx_packets += tmp.tx_packets;
2947 s->tx_bytes += tmp.tx_bytes;
2948 }
2949
2950 s->rx_dropped = dev->stats.rx_dropped;
2951 s->tx_dropped = dev->stats.tx_dropped;
2952}
2953
2954static int macsec_get_iflink(const struct net_device *dev)
2955{
2956 return macsec_priv(dev)->real_dev->ifindex;
2957}
2958
2959static const struct net_device_ops macsec_netdev_ops = {
2960 .ndo_init = macsec_dev_init,
2961 .ndo_uninit = macsec_dev_uninit,
2962 .ndo_open = macsec_dev_open,
2963 .ndo_stop = macsec_dev_stop,
2964 .ndo_fix_features = macsec_fix_features,
2965 .ndo_change_mtu = macsec_change_mtu,
2966 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2967 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2968 .ndo_set_mac_address = macsec_set_mac_address,
2969 .ndo_start_xmit = macsec_start_xmit,
2970 .ndo_get_stats64 = macsec_get_stats64,
2971 .ndo_get_iflink = macsec_get_iflink,
2972};
2973
2974static const struct device_type macsec_type = {
2975 .name = "macsec",
2976};
2977
2978static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2979 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2980 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2981 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2982 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2983 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2984 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2985 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2986 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2987 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2988 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2989 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2990 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2991};
2992
2993static void macsec_free_netdev(struct net_device *dev)
2994{
2995 struct macsec_dev *macsec = macsec_priv(dev);
2996
2997 free_percpu(macsec->stats);
2998 free_percpu(macsec->secy.tx_sc.stats);
2999
3000}
3001
3002static void macsec_setup(struct net_device *dev)
3003{
3004 ether_setup(dev);
3005 dev->min_mtu = 0;
3006 dev->max_mtu = ETH_MAX_MTU;
3007 dev->priv_flags |= IFF_NO_QUEUE;
3008 dev->netdev_ops = &macsec_netdev_ops;
3009 dev->needs_free_netdev = true;
3010 dev->priv_destructor = macsec_free_netdev;
3011 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3012
3013 eth_zero_addr(dev->broadcast);
3014}
3015
3016static int macsec_changelink_common(struct net_device *dev,
3017 struct nlattr *data[])
3018{
3019 struct macsec_secy *secy;
3020 struct macsec_tx_sc *tx_sc;
3021
3022 secy = &macsec_priv(dev)->secy;
3023 tx_sc = &secy->tx_sc;
3024
3025 if (data[IFLA_MACSEC_ENCODING_SA]) {
3026 struct macsec_tx_sa *tx_sa;
3027
3028 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3029 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3030
3031 secy->operational = tx_sa && tx_sa->active;
3032 }
3033
3034 if (data[IFLA_MACSEC_WINDOW])
3035 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3036
3037 if (data[IFLA_MACSEC_ENCRYPT])
3038 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3039
3040 if (data[IFLA_MACSEC_PROTECT])
3041 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3042
3043 if (data[IFLA_MACSEC_INC_SCI])
3044 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3045
3046 if (data[IFLA_MACSEC_ES])
3047 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3048
3049 if (data[IFLA_MACSEC_SCB])
3050 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3051
3052 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3053 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3054
3055 if (data[IFLA_MACSEC_VALIDATION])
3056 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3057
3058 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3059 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3060 case MACSEC_CIPHER_ID_GCM_AES_128:
3061 case MACSEC_DEFAULT_CIPHER_ID:
3062 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3063 break;
3064 case MACSEC_CIPHER_ID_GCM_AES_256:
3065 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3066 break;
3067 default:
3068 return -EINVAL;
3069 }
3070 }
3071
3072 return 0;
3073}
3074
3075static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3076 struct nlattr *data[],
3077 struct netlink_ext_ack *extack)
3078{
3079 if (!data)
3080 return 0;
3081
3082 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3083 data[IFLA_MACSEC_ICV_LEN] ||
3084 data[IFLA_MACSEC_SCI] ||
3085 data[IFLA_MACSEC_PORT])
3086 return -EINVAL;
3087
3088 return macsec_changelink_common(dev, data);
3089}
3090
3091static void macsec_del_dev(struct macsec_dev *macsec)
3092{
3093 int i;
3094
3095 while (macsec->secy.rx_sc) {
3096 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3097
3098 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3099 free_rx_sc(rx_sc);
3100 }
3101
3102 for (i = 0; i < MACSEC_NUM_AN; i++) {
3103 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3104
3105 if (sa) {
3106 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3107 clear_tx_sa(sa);
3108 }
3109 }
3110}
3111
3112static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3113{
3114 struct macsec_dev *macsec = macsec_priv(dev);
3115 struct net_device *real_dev = macsec->real_dev;
3116
3117 unregister_netdevice_queue(dev, head);
3118 list_del_rcu(&macsec->secys);
3119 macsec_del_dev(macsec);
3120 netdev_upper_dev_unlink(real_dev, dev);
3121
3122 macsec_generation++;
3123}
3124
3125static void macsec_dellink(struct net_device *dev, struct list_head *head)
3126{
3127 struct macsec_dev *macsec = macsec_priv(dev);
3128 struct net_device *real_dev = macsec->real_dev;
3129 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3130
3131 macsec_common_dellink(dev, head);
3132
3133 if (list_empty(&rxd->secys)) {
3134 netdev_rx_handler_unregister(real_dev);
3135 kfree(rxd);
3136 }
3137}
3138
3139static int register_macsec_dev(struct net_device *real_dev,
3140 struct net_device *dev)
3141{
3142 struct macsec_dev *macsec = macsec_priv(dev);
3143 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3144
3145 if (!rxd) {
3146 int err;
3147
3148 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3149 if (!rxd)
3150 return -ENOMEM;
3151
3152 INIT_LIST_HEAD(&rxd->secys);
3153
3154 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3155 rxd);
3156 if (err < 0) {
3157 kfree(rxd);
3158 return err;
3159 }
3160 }
3161
3162 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3163 return 0;
3164}
3165
3166static bool sci_exists(struct net_device *dev, sci_t sci)
3167{
3168 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3169 struct macsec_dev *macsec;
3170
3171 list_for_each_entry(macsec, &rxd->secys, secys) {
3172 if (macsec->secy.sci == sci)
3173 return true;
3174 }
3175
3176 return false;
3177}
3178
3179static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3180{
3181 return make_sci(dev->dev_addr, port);
3182}
3183
3184static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3185{
3186 struct macsec_dev *macsec = macsec_priv(dev);
3187 struct macsec_secy *secy = &macsec->secy;
3188
3189 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3190 if (!macsec->stats)
3191 return -ENOMEM;
3192
3193 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3194 if (!secy->tx_sc.stats) {
3195 free_percpu(macsec->stats);
3196 return -ENOMEM;
3197 }
3198
3199 if (sci == MACSEC_UNDEF_SCI)
3200 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3201
3202 secy->netdev = dev;
3203 secy->operational = true;
3204 secy->key_len = DEFAULT_SAK_LEN;
3205 secy->icv_len = icv_len;
3206 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3207 secy->protect_frames = true;
3208 secy->replay_protect = false;
3209
3210 secy->sci = sci;
3211 secy->tx_sc.active = true;
3212 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3213 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3214 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3215 secy->tx_sc.end_station = false;
3216 secy->tx_sc.scb = false;
3217
3218 return 0;
3219}
3220
3221static int macsec_newlink(struct net *net, struct net_device *dev,
3222 struct nlattr *tb[], struct nlattr *data[],
3223 struct netlink_ext_ack *extack)
3224{
3225 struct macsec_dev *macsec = macsec_priv(dev);
3226 struct net_device *real_dev;
3227 int err;
3228 sci_t sci;
3229 u8 icv_len = DEFAULT_ICV_LEN;
3230 rx_handler_func_t *rx_handler;
3231
3232 if (!tb[IFLA_LINK])
3233 return -EINVAL;
3234 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3235 if (!real_dev)
3236 return -ENODEV;
3237
3238 dev->priv_flags |= IFF_MACSEC;
3239
3240 macsec->real_dev = real_dev;
3241
3242 if (data && data[IFLA_MACSEC_ICV_LEN])
3243 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3244 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3245
3246 rx_handler = rtnl_dereference(real_dev->rx_handler);
3247 if (rx_handler && rx_handler != macsec_handle_frame)
3248 return -EBUSY;
3249
3250 err = register_netdevice(dev);
3251 if (err < 0)
3252 return err;
3253
3254 err = netdev_upper_dev_link(real_dev, dev, extack);
3255 if (err < 0)
3256 goto unregister;
3257
3258 /* need to be already registered so that ->init has run and
3259 * the MAC addr is set
3260 */
3261 if (data && data[IFLA_MACSEC_SCI])
3262 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3263 else if (data && data[IFLA_MACSEC_PORT])
3264 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3265 else
3266 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3267
3268 if (rx_handler && sci_exists(real_dev, sci)) {
3269 err = -EBUSY;
3270 goto unlink;
3271 }
3272
3273 err = macsec_add_dev(dev, sci, icv_len);
3274 if (err)
3275 goto unlink;
3276
3277 if (data) {
3278 err = macsec_changelink_common(dev, data);
3279 if (err)
3280 goto del_dev;
3281 }
3282
3283 err = register_macsec_dev(real_dev, dev);
3284 if (err < 0)
3285 goto del_dev;
3286
3287 netif_stacked_transfer_operstate(real_dev, dev);
3288 linkwatch_fire_event(dev);
3289
3290 macsec_generation++;
3291
3292 return 0;
3293
3294del_dev:
3295 macsec_del_dev(macsec);
3296unlink:
3297 netdev_upper_dev_unlink(real_dev, dev);
3298unregister:
3299 unregister_netdevice(dev);
3300 return err;
3301}
3302
3303static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
3304 struct netlink_ext_ack *extack)
3305{
3306 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3307 u8 icv_len = DEFAULT_ICV_LEN;
3308 int flag;
3309 bool es, scb, sci;
3310
3311 if (!data)
3312 return 0;
3313
3314 if (data[IFLA_MACSEC_CIPHER_SUITE])
3315 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3316
3317 if (data[IFLA_MACSEC_ICV_LEN]) {
3318 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3319 if (icv_len != DEFAULT_ICV_LEN) {
3320 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3321 struct crypto_aead *dummy_tfm;
3322
3323 dummy_tfm = macsec_alloc_tfm(dummy_key,
3324 DEFAULT_SAK_LEN,
3325 icv_len);
3326 if (IS_ERR(dummy_tfm))
3327 return PTR_ERR(dummy_tfm);
3328 crypto_free_aead(dummy_tfm);
3329 }
3330 }
3331
3332 switch (csid) {
3333 case MACSEC_CIPHER_ID_GCM_AES_128:
3334 case MACSEC_CIPHER_ID_GCM_AES_256:
3335 case MACSEC_DEFAULT_CIPHER_ID:
3336 if (icv_len < MACSEC_MIN_ICV_LEN ||
3337 icv_len > MACSEC_STD_ICV_LEN)
3338 return -EINVAL;
3339 break;
3340 default:
3341 return -EINVAL;
3342 }
3343
3344 if (data[IFLA_MACSEC_ENCODING_SA]) {
3345 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3346 return -EINVAL;
3347 }
3348
3349 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3350 flag < IFLA_MACSEC_VALIDATION;
3351 flag++) {
3352 if (data[flag]) {
3353 if (nla_get_u8(data[flag]) > 1)
3354 return -EINVAL;
3355 }
3356 }
3357
3358 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3359 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3360 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3361
3362 if ((sci && (scb || es)) || (scb && es))
3363 return -EINVAL;
3364
3365 if (data[IFLA_MACSEC_VALIDATION] &&
3366 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3367 return -EINVAL;
3368
3369 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3370 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3371 !data[IFLA_MACSEC_WINDOW])
3372 return -EINVAL;
3373
3374 return 0;
3375}
3376
3377static struct net *macsec_get_link_net(const struct net_device *dev)
3378{
3379 return dev_net(macsec_priv(dev)->real_dev);
3380}
3381
3382static size_t macsec_get_size(const struct net_device *dev)
3383{
3384 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3385 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3386 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3387 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3388 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3389 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3390 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3391 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3392 nla_total_size(1) + /* IFLA_MACSEC_ES */
3393 nla_total_size(1) + /* IFLA_MACSEC_SCB */
3394 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3395 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3396 0;
3397}
3398
3399static int macsec_fill_info(struct sk_buff *skb,
3400 const struct net_device *dev)
3401{
3402 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3403 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3404 u64 csid;
3405
3406 switch (secy->key_len) {
3407 case MACSEC_GCM_AES_128_SAK_LEN:
3408 csid = MACSEC_DEFAULT_CIPHER_ID;
3409 break;
3410 case MACSEC_GCM_AES_256_SAK_LEN:
3411 csid = MACSEC_CIPHER_ID_GCM_AES_256;
3412 break;
3413 default:
3414 goto nla_put_failure;
3415 }
3416
3417 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3418 IFLA_MACSEC_PAD) ||
3419 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3420 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3421 csid, IFLA_MACSEC_PAD) ||
3422 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3423 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3424 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3425 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3426 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3427 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3428 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3429 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3430 0)
3431 goto nla_put_failure;
3432
3433 if (secy->replay_protect) {
3434 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3435 goto nla_put_failure;
3436 }
3437
3438 return 0;
3439
3440nla_put_failure:
3441 return -EMSGSIZE;
3442}
3443
3444static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3445 .kind = "macsec",
3446 .priv_size = sizeof(struct macsec_dev),
3447 .maxtype = IFLA_MACSEC_MAX,
3448 .policy = macsec_rtnl_policy,
3449 .setup = macsec_setup,
3450 .validate = macsec_validate_attr,
3451 .newlink = macsec_newlink,
3452 .changelink = macsec_changelink,
3453 .dellink = macsec_dellink,
3454 .get_size = macsec_get_size,
3455 .fill_info = macsec_fill_info,
3456 .get_link_net = macsec_get_link_net,
3457};
3458
3459static bool is_macsec_master(struct net_device *dev)
3460{
3461 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3462}
3463
3464static int macsec_notify(struct notifier_block *this, unsigned long event,
3465 void *ptr)
3466{
3467 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3468 LIST_HEAD(head);
3469
3470 if (!is_macsec_master(real_dev))
3471 return NOTIFY_DONE;
3472
3473 switch (event) {
3474 case NETDEV_DOWN:
3475 case NETDEV_UP:
3476 case NETDEV_CHANGE: {
3477 struct macsec_dev *m, *n;
3478 struct macsec_rxh_data *rxd;
3479
3480 rxd = macsec_data_rtnl(real_dev);
3481 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3482 struct net_device *dev = m->secy.netdev;
3483
3484 netif_stacked_transfer_operstate(real_dev, dev);
3485 }
3486 break;
3487 }
3488 case NETDEV_UNREGISTER: {
3489 struct macsec_dev *m, *n;
3490 struct macsec_rxh_data *rxd;
3491
3492 rxd = macsec_data_rtnl(real_dev);
3493 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3494 macsec_common_dellink(m->secy.netdev, &head);
3495 }
3496
3497 netdev_rx_handler_unregister(real_dev);
3498 kfree(rxd);
3499
3500 unregister_netdevice_many(&head);
3501 break;
3502 }
3503 case NETDEV_CHANGEMTU: {
3504 struct macsec_dev *m;
3505 struct macsec_rxh_data *rxd;
3506
3507 rxd = macsec_data_rtnl(real_dev);
3508 list_for_each_entry(m, &rxd->secys, secys) {
3509 struct net_device *dev = m->secy.netdev;
3510 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3511 macsec_extra_len(true));
3512
3513 if (dev->mtu > mtu)
3514 dev_set_mtu(dev, mtu);
3515 }
3516 }
3517 }
3518
3519 return NOTIFY_OK;
3520}
3521
3522static struct notifier_block macsec_notifier = {
3523 .notifier_call = macsec_notify,
3524};
3525
3526static int __init macsec_init(void)
3527{
3528 int err;
3529
3530 pr_info("MACsec IEEE 802.1AE\n");
3531 err = register_netdevice_notifier(&macsec_notifier);
3532 if (err)
3533 return err;
3534
3535 err = rtnl_link_register(&macsec_link_ops);
3536 if (err)
3537 goto notifier;
3538
3539 err = genl_register_family(&macsec_fam);
3540 if (err)
3541 goto rtnl;
3542
3543 return 0;
3544
3545rtnl:
3546 rtnl_link_unregister(&macsec_link_ops);
3547notifier:
3548 unregister_netdevice_notifier(&macsec_notifier);
3549 return err;
3550}
3551
3552static void __exit macsec_exit(void)
3553{
3554 genl_unregister_family(&macsec_fam);
3555 rtnl_link_unregister(&macsec_link_ops);
3556 unregister_netdevice_notifier(&macsec_notifier);
3557 rcu_barrier();
3558}
3559
3560module_init(macsec_init);
3561module_exit(macsec_exit);
3562
3563MODULE_ALIAS_RTNL_LINK("macsec");
3564MODULE_ALIAS_GENL_FAMILY("macsec");
3565
3566MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3567MODULE_LICENSE("GPL v2");
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#include <linux/byteorder/generic.h>
23#include <linux/if_arp.h>
24
25#include <uapi/linux/if_macsec.h>
26
27#define MACSEC_SCI_LEN 8
28
29/* SecTAG length = macsec_eth_header without the optional SCI */
30#define MACSEC_TAG_LEN 6
31
32struct macsec_eth_header {
33 struct ethhdr eth;
34 /* SecTAG */
35 u8 tci_an;
36#if defined(__LITTLE_ENDIAN_BITFIELD)
37 u8 short_length:6,
38 unused:2;
39#elif defined(__BIG_ENDIAN_BITFIELD)
40 u8 unused:2,
41 short_length:6;
42#else
43#error "Please fix <asm/byteorder.h>"
44#endif
45 __be32 packet_number;
46 u8 secure_channel_id[8]; /* optional */
47} __packed;
48
49#define MACSEC_TCI_VERSION 0x80
50#define MACSEC_TCI_ES 0x40 /* end station */
51#define MACSEC_TCI_SC 0x20 /* SCI present */
52#define MACSEC_TCI_SCB 0x10 /* epon */
53#define MACSEC_TCI_E 0x08 /* encryption */
54#define MACSEC_TCI_C 0x04 /* changed text */
55#define MACSEC_AN_MASK 0x03 /* association number */
56#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
57
58/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
59#define MIN_NON_SHORT_LEN 48
60
61#define GCM_AES_IV_LEN 12
62#define DEFAULT_ICV_LEN 16
63
64#define for_each_rxsc(secy, sc) \
65 for (sc = rcu_dereference_bh(secy->rx_sc); \
66 sc; \
67 sc = rcu_dereference_bh(sc->next))
68#define for_each_rxsc_rtnl(secy, sc) \
69 for (sc = rtnl_dereference(secy->rx_sc); \
70 sc; \
71 sc = rtnl_dereference(sc->next))
72
73#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
74
75struct gcm_iv_xpn {
76 union {
77 u8 short_secure_channel_id[4];
78 ssci_t ssci;
79 };
80 __be64 pn;
81} __packed;
82
83struct gcm_iv {
84 union {
85 u8 secure_channel_id[8];
86 sci_t sci;
87 };
88 __be32 pn;
89};
90
91#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
92
93struct pcpu_secy_stats {
94 struct macsec_dev_stats stats;
95 struct u64_stats_sync syncp;
96};
97
98/**
99 * struct macsec_dev - private data
100 * @secy: SecY config
101 * @real_dev: pointer to underlying netdevice
102 * @stats: MACsec device stats
103 * @secys: linked list of SecY's on the underlying device
104 * @gro_cells: pointer to the Generic Receive Offload cell
105 * @offload: status of offloading on the MACsec device
106 */
107struct macsec_dev {
108 struct macsec_secy secy;
109 struct net_device *real_dev;
110 struct pcpu_secy_stats __percpu *stats;
111 struct list_head secys;
112 struct gro_cells gro_cells;
113 enum macsec_offload offload;
114};
115
116/**
117 * struct macsec_rxh_data - rx_handler private argument
118 * @secys: linked list of SecY's on this underlying device
119 */
120struct macsec_rxh_data {
121 struct list_head secys;
122};
123
124static struct macsec_dev *macsec_priv(const struct net_device *dev)
125{
126 return (struct macsec_dev *)netdev_priv(dev);
127}
128
129static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
130{
131 return rcu_dereference_bh(dev->rx_handler_data);
132}
133
134static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
135{
136 return rtnl_dereference(dev->rx_handler_data);
137}
138
139struct macsec_cb {
140 struct aead_request *req;
141 union {
142 struct macsec_tx_sa *tx_sa;
143 struct macsec_rx_sa *rx_sa;
144 };
145 u8 assoc_num;
146 bool valid;
147 bool has_sci;
148};
149
150static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
151{
152 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
153
154 if (!sa || !sa->active)
155 return NULL;
156
157 if (!refcount_inc_not_zero(&sa->refcnt))
158 return NULL;
159
160 return sa;
161}
162
163static void free_rx_sc_rcu(struct rcu_head *head)
164{
165 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
166
167 free_percpu(rx_sc->stats);
168 kfree(rx_sc);
169}
170
171static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
172{
173 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
174}
175
176static void macsec_rxsc_put(struct macsec_rx_sc *sc)
177{
178 if (refcount_dec_and_test(&sc->refcnt))
179 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
180}
181
182static void free_rxsa(struct rcu_head *head)
183{
184 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
185
186 crypto_free_aead(sa->key.tfm);
187 free_percpu(sa->stats);
188 kfree(sa);
189}
190
191static void macsec_rxsa_put(struct macsec_rx_sa *sa)
192{
193 if (refcount_dec_and_test(&sa->refcnt))
194 call_rcu(&sa->rcu, free_rxsa);
195}
196
197static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
198{
199 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
200
201 if (!sa || !sa->active)
202 return NULL;
203
204 if (!refcount_inc_not_zero(&sa->refcnt))
205 return NULL;
206
207 return sa;
208}
209
210static void free_txsa(struct rcu_head *head)
211{
212 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
213
214 crypto_free_aead(sa->key.tfm);
215 free_percpu(sa->stats);
216 kfree(sa);
217}
218
219static void macsec_txsa_put(struct macsec_tx_sa *sa)
220{
221 if (refcount_dec_and_test(&sa->refcnt))
222 call_rcu(&sa->rcu, free_txsa);
223}
224
225static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
226{
227 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
228 return (struct macsec_cb *)skb->cb;
229}
230
231#define MACSEC_PORT_ES (htons(0x0001))
232#define MACSEC_PORT_SCB (0x0000)
233#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
234#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
235
236#define MACSEC_GCM_AES_128_SAK_LEN 16
237#define MACSEC_GCM_AES_256_SAK_LEN 32
238
239#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
240#define DEFAULT_XPN false
241#define DEFAULT_SEND_SCI true
242#define DEFAULT_ENCRYPT false
243#define DEFAULT_ENCODING_SA 0
244
245static bool send_sci(const struct macsec_secy *secy)
246{
247 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
248
249 return tx_sc->send_sci ||
250 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
251}
252
253static sci_t make_sci(u8 *addr, __be16 port)
254{
255 sci_t sci;
256
257 memcpy(&sci, addr, ETH_ALEN);
258 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
259
260 return sci;
261}
262
263static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
264{
265 sci_t sci;
266
267 if (sci_present)
268 memcpy(&sci, hdr->secure_channel_id,
269 sizeof(hdr->secure_channel_id));
270 else
271 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
272
273 return sci;
274}
275
276static unsigned int macsec_sectag_len(bool sci_present)
277{
278 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
279}
280
281static unsigned int macsec_hdr_len(bool sci_present)
282{
283 return macsec_sectag_len(sci_present) + ETH_HLEN;
284}
285
286static unsigned int macsec_extra_len(bool sci_present)
287{
288 return macsec_sectag_len(sci_present) + sizeof(__be16);
289}
290
291/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
292static void macsec_fill_sectag(struct macsec_eth_header *h,
293 const struct macsec_secy *secy, u32 pn,
294 bool sci_present)
295{
296 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
297
298 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
299 h->eth.h_proto = htons(ETH_P_MACSEC);
300
301 if (sci_present) {
302 h->tci_an |= MACSEC_TCI_SC;
303 memcpy(&h->secure_channel_id, &secy->sci,
304 sizeof(h->secure_channel_id));
305 } else {
306 if (tx_sc->end_station)
307 h->tci_an |= MACSEC_TCI_ES;
308 if (tx_sc->scb)
309 h->tci_an |= MACSEC_TCI_SCB;
310 }
311
312 h->packet_number = htonl(pn);
313
314 /* with GCM, C/E clear for !encrypt, both set for encrypt */
315 if (tx_sc->encrypt)
316 h->tci_an |= MACSEC_TCI_CONFID;
317 else if (secy->icv_len != DEFAULT_ICV_LEN)
318 h->tci_an |= MACSEC_TCI_C;
319
320 h->tci_an |= tx_sc->encoding_sa;
321}
322
323static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
324{
325 if (data_len < MIN_NON_SHORT_LEN)
326 h->short_length = data_len;
327}
328
329/* Checks if a MACsec interface is being offloaded to an hardware engine */
330static bool macsec_is_offloaded(struct macsec_dev *macsec)
331{
332 if (macsec->offload == MACSEC_OFFLOAD_MAC ||
333 macsec->offload == MACSEC_OFFLOAD_PHY)
334 return true;
335
336 return false;
337}
338
339/* Checks if underlying layers implement MACsec offloading functions. */
340static bool macsec_check_offload(enum macsec_offload offload,
341 struct macsec_dev *macsec)
342{
343 if (!macsec || !macsec->real_dev)
344 return false;
345
346 if (offload == MACSEC_OFFLOAD_PHY)
347 return macsec->real_dev->phydev &&
348 macsec->real_dev->phydev->macsec_ops;
349 else if (offload == MACSEC_OFFLOAD_MAC)
350 return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
351 macsec->real_dev->macsec_ops;
352
353 return false;
354}
355
356static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
357 struct macsec_dev *macsec,
358 struct macsec_context *ctx)
359{
360 if (ctx) {
361 memset(ctx, 0, sizeof(*ctx));
362 ctx->offload = offload;
363
364 if (offload == MACSEC_OFFLOAD_PHY)
365 ctx->phydev = macsec->real_dev->phydev;
366 else if (offload == MACSEC_OFFLOAD_MAC)
367 ctx->netdev = macsec->real_dev;
368 }
369
370 if (offload == MACSEC_OFFLOAD_PHY)
371 return macsec->real_dev->phydev->macsec_ops;
372 else
373 return macsec->real_dev->macsec_ops;
374}
375
376/* Returns a pointer to the MACsec ops struct if any and updates the MACsec
377 * context device reference if provided.
378 */
379static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
380 struct macsec_context *ctx)
381{
382 if (!macsec_check_offload(macsec->offload, macsec))
383 return NULL;
384
385 return __macsec_get_ops(macsec->offload, macsec, ctx);
386}
387
388/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
389static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
390{
391 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
392 int len = skb->len - 2 * ETH_ALEN;
393 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
394
395 /* a) It comprises at least 17 octets */
396 if (skb->len <= 16)
397 return false;
398
399 /* b) MACsec EtherType: already checked */
400
401 /* c) V bit is clear */
402 if (h->tci_an & MACSEC_TCI_VERSION)
403 return false;
404
405 /* d) ES or SCB => !SC */
406 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
407 (h->tci_an & MACSEC_TCI_SC))
408 return false;
409
410 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
411 if (h->unused)
412 return false;
413
414 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
415 if (!h->packet_number && !xpn)
416 return false;
417
418 /* length check, f) g) h) i) */
419 if (h->short_length)
420 return len == extra_len + h->short_length;
421 return len >= extra_len + MIN_NON_SHORT_LEN;
422}
423
424#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
425#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
426
427static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
428 salt_t salt)
429{
430 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
431
432 gcm_iv->ssci = ssci ^ salt.ssci;
433 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
434}
435
436static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
437{
438 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
439
440 gcm_iv->sci = sci;
441 gcm_iv->pn = htonl(pn);
442}
443
444static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
445{
446 return (struct macsec_eth_header *)skb_mac_header(skb);
447}
448
449static sci_t dev_to_sci(struct net_device *dev, __be16 port)
450{
451 return make_sci(dev->dev_addr, port);
452}
453
454static void __macsec_pn_wrapped(struct macsec_secy *secy,
455 struct macsec_tx_sa *tx_sa)
456{
457 pr_debug("PN wrapped, transitioning to !oper\n");
458 tx_sa->active = false;
459 if (secy->protect_frames)
460 secy->operational = false;
461}
462
463void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
464{
465 spin_lock_bh(&tx_sa->lock);
466 __macsec_pn_wrapped(secy, tx_sa);
467 spin_unlock_bh(&tx_sa->lock);
468}
469EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
470
471static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
472 struct macsec_secy *secy)
473{
474 pn_t pn;
475
476 spin_lock_bh(&tx_sa->lock);
477
478 pn = tx_sa->next_pn_halves;
479 if (secy->xpn)
480 tx_sa->next_pn++;
481 else
482 tx_sa->next_pn_halves.lower++;
483
484 if (tx_sa->next_pn == 0)
485 __macsec_pn_wrapped(secy, tx_sa);
486 spin_unlock_bh(&tx_sa->lock);
487
488 return pn;
489}
490
491static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
492{
493 struct macsec_dev *macsec = netdev_priv(dev);
494
495 skb->dev = macsec->real_dev;
496 skb_reset_mac_header(skb);
497 skb->protocol = eth_hdr(skb)->h_proto;
498}
499
500static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
501 struct macsec_tx_sa *tx_sa)
502{
503 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
504
505 u64_stats_update_begin(&txsc_stats->syncp);
506 if (tx_sc->encrypt) {
507 txsc_stats->stats.OutOctetsEncrypted += skb->len;
508 txsc_stats->stats.OutPktsEncrypted++;
509 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
510 } else {
511 txsc_stats->stats.OutOctetsProtected += skb->len;
512 txsc_stats->stats.OutPktsProtected++;
513 this_cpu_inc(tx_sa->stats->OutPktsProtected);
514 }
515 u64_stats_update_end(&txsc_stats->syncp);
516}
517
518static void count_tx(struct net_device *dev, int ret, int len)
519{
520 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
521 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
522
523 u64_stats_update_begin(&stats->syncp);
524 stats->tx_packets++;
525 stats->tx_bytes += len;
526 u64_stats_update_end(&stats->syncp);
527 }
528}
529
530static void macsec_encrypt_done(struct crypto_async_request *base, int err)
531{
532 struct sk_buff *skb = base->data;
533 struct net_device *dev = skb->dev;
534 struct macsec_dev *macsec = macsec_priv(dev);
535 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
536 int len, ret;
537
538 aead_request_free(macsec_skb_cb(skb)->req);
539
540 rcu_read_lock_bh();
541 macsec_encrypt_finish(skb, dev);
542 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
543 len = skb->len;
544 ret = dev_queue_xmit(skb);
545 count_tx(dev, ret, len);
546 rcu_read_unlock_bh();
547
548 macsec_txsa_put(sa);
549 dev_put(dev);
550}
551
552static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
553 unsigned char **iv,
554 struct scatterlist **sg,
555 int num_frags)
556{
557 size_t size, iv_offset, sg_offset;
558 struct aead_request *req;
559 void *tmp;
560
561 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
562 iv_offset = size;
563 size += GCM_AES_IV_LEN;
564
565 size = ALIGN(size, __alignof__(struct scatterlist));
566 sg_offset = size;
567 size += sizeof(struct scatterlist) * num_frags;
568
569 tmp = kmalloc(size, GFP_ATOMIC);
570 if (!tmp)
571 return NULL;
572
573 *iv = (unsigned char *)(tmp + iv_offset);
574 *sg = (struct scatterlist *)(tmp + sg_offset);
575 req = tmp;
576
577 aead_request_set_tfm(req, tfm);
578
579 return req;
580}
581
582static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
583 struct net_device *dev)
584{
585 int ret;
586 struct scatterlist *sg;
587 struct sk_buff *trailer;
588 unsigned char *iv;
589 struct ethhdr *eth;
590 struct macsec_eth_header *hh;
591 size_t unprotected_len;
592 struct aead_request *req;
593 struct macsec_secy *secy;
594 struct macsec_tx_sc *tx_sc;
595 struct macsec_tx_sa *tx_sa;
596 struct macsec_dev *macsec = macsec_priv(dev);
597 bool sci_present;
598 pn_t pn;
599
600 secy = &macsec->secy;
601 tx_sc = &secy->tx_sc;
602
603 /* 10.5.1 TX SA assignment */
604 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
605 if (!tx_sa) {
606 secy->operational = false;
607 kfree_skb(skb);
608 return ERR_PTR(-EINVAL);
609 }
610
611 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
612 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
613 struct sk_buff *nskb = skb_copy_expand(skb,
614 MACSEC_NEEDED_HEADROOM,
615 MACSEC_NEEDED_TAILROOM,
616 GFP_ATOMIC);
617 if (likely(nskb)) {
618 consume_skb(skb);
619 skb = nskb;
620 } else {
621 macsec_txsa_put(tx_sa);
622 kfree_skb(skb);
623 return ERR_PTR(-ENOMEM);
624 }
625 } else {
626 skb = skb_unshare(skb, GFP_ATOMIC);
627 if (!skb) {
628 macsec_txsa_put(tx_sa);
629 return ERR_PTR(-ENOMEM);
630 }
631 }
632
633 unprotected_len = skb->len;
634 eth = eth_hdr(skb);
635 sci_present = send_sci(secy);
636 hh = skb_push(skb, macsec_extra_len(sci_present));
637 memmove(hh, eth, 2 * ETH_ALEN);
638
639 pn = tx_sa_update_pn(tx_sa, secy);
640 if (pn.full64 == 0) {
641 macsec_txsa_put(tx_sa);
642 kfree_skb(skb);
643 return ERR_PTR(-ENOLINK);
644 }
645 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
646 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
647
648 skb_put(skb, secy->icv_len);
649
650 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
651 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
652
653 u64_stats_update_begin(&secy_stats->syncp);
654 secy_stats->stats.OutPktsTooLong++;
655 u64_stats_update_end(&secy_stats->syncp);
656
657 macsec_txsa_put(tx_sa);
658 kfree_skb(skb);
659 return ERR_PTR(-EINVAL);
660 }
661
662 ret = skb_cow_data(skb, 0, &trailer);
663 if (unlikely(ret < 0)) {
664 macsec_txsa_put(tx_sa);
665 kfree_skb(skb);
666 return ERR_PTR(ret);
667 }
668
669 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
670 if (!req) {
671 macsec_txsa_put(tx_sa);
672 kfree_skb(skb);
673 return ERR_PTR(-ENOMEM);
674 }
675
676 if (secy->xpn)
677 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
678 else
679 macsec_fill_iv(iv, secy->sci, pn.lower);
680
681 sg_init_table(sg, ret);
682 ret = skb_to_sgvec(skb, sg, 0, skb->len);
683 if (unlikely(ret < 0)) {
684 aead_request_free(req);
685 macsec_txsa_put(tx_sa);
686 kfree_skb(skb);
687 return ERR_PTR(ret);
688 }
689
690 if (tx_sc->encrypt) {
691 int len = skb->len - macsec_hdr_len(sci_present) -
692 secy->icv_len;
693 aead_request_set_crypt(req, sg, sg, len, iv);
694 aead_request_set_ad(req, macsec_hdr_len(sci_present));
695 } else {
696 aead_request_set_crypt(req, sg, sg, 0, iv);
697 aead_request_set_ad(req, skb->len - secy->icv_len);
698 }
699
700 macsec_skb_cb(skb)->req = req;
701 macsec_skb_cb(skb)->tx_sa = tx_sa;
702 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
703
704 dev_hold(skb->dev);
705 ret = crypto_aead_encrypt(req);
706 if (ret == -EINPROGRESS) {
707 return ERR_PTR(ret);
708 } else if (ret != 0) {
709 dev_put(skb->dev);
710 kfree_skb(skb);
711 aead_request_free(req);
712 macsec_txsa_put(tx_sa);
713 return ERR_PTR(-EINVAL);
714 }
715
716 dev_put(skb->dev);
717 aead_request_free(req);
718 macsec_txsa_put(tx_sa);
719
720 return skb;
721}
722
723static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
724{
725 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
726 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
727 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
728 u32 lowest_pn = 0;
729
730 spin_lock(&rx_sa->lock);
731 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
732 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
733
734 /* Now perform replay protection check again
735 * (see IEEE 802.1AE-2006 figure 10-5)
736 */
737 if (secy->replay_protect && pn < lowest_pn &&
738 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
739 spin_unlock(&rx_sa->lock);
740 u64_stats_update_begin(&rxsc_stats->syncp);
741 rxsc_stats->stats.InPktsLate++;
742 u64_stats_update_end(&rxsc_stats->syncp);
743 return false;
744 }
745
746 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
747 u64_stats_update_begin(&rxsc_stats->syncp);
748 if (hdr->tci_an & MACSEC_TCI_E)
749 rxsc_stats->stats.InOctetsDecrypted += skb->len;
750 else
751 rxsc_stats->stats.InOctetsValidated += skb->len;
752 u64_stats_update_end(&rxsc_stats->syncp);
753 }
754
755 if (!macsec_skb_cb(skb)->valid) {
756 spin_unlock(&rx_sa->lock);
757
758 /* 10.6.5 */
759 if (hdr->tci_an & MACSEC_TCI_C ||
760 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
761 u64_stats_update_begin(&rxsc_stats->syncp);
762 rxsc_stats->stats.InPktsNotValid++;
763 u64_stats_update_end(&rxsc_stats->syncp);
764 return false;
765 }
766
767 u64_stats_update_begin(&rxsc_stats->syncp);
768 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
769 rxsc_stats->stats.InPktsInvalid++;
770 this_cpu_inc(rx_sa->stats->InPktsInvalid);
771 } else if (pn < lowest_pn) {
772 rxsc_stats->stats.InPktsDelayed++;
773 } else {
774 rxsc_stats->stats.InPktsUnchecked++;
775 }
776 u64_stats_update_end(&rxsc_stats->syncp);
777 } else {
778 u64_stats_update_begin(&rxsc_stats->syncp);
779 if (pn < lowest_pn) {
780 rxsc_stats->stats.InPktsDelayed++;
781 } else {
782 rxsc_stats->stats.InPktsOK++;
783 this_cpu_inc(rx_sa->stats->InPktsOK);
784 }
785 u64_stats_update_end(&rxsc_stats->syncp);
786
787 // Instead of "pn >=" - to support pn overflow in xpn
788 if (pn + 1 > rx_sa->next_pn_halves.lower) {
789 rx_sa->next_pn_halves.lower = pn + 1;
790 } else if (secy->xpn &&
791 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
792 rx_sa->next_pn_halves.upper++;
793 rx_sa->next_pn_halves.lower = pn + 1;
794 }
795
796 spin_unlock(&rx_sa->lock);
797 }
798
799 return true;
800}
801
802static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
803{
804 skb->pkt_type = PACKET_HOST;
805 skb->protocol = eth_type_trans(skb, dev);
806
807 skb_reset_network_header(skb);
808 if (!skb_transport_header_was_set(skb))
809 skb_reset_transport_header(skb);
810 skb_reset_mac_len(skb);
811}
812
813static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
814{
815 skb->ip_summed = CHECKSUM_NONE;
816 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
817 skb_pull(skb, hdr_len);
818 pskb_trim_unique(skb, skb->len - icv_len);
819}
820
821static void count_rx(struct net_device *dev, int len)
822{
823 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
824
825 u64_stats_update_begin(&stats->syncp);
826 stats->rx_packets++;
827 stats->rx_bytes += len;
828 u64_stats_update_end(&stats->syncp);
829}
830
831static void macsec_decrypt_done(struct crypto_async_request *base, int err)
832{
833 struct sk_buff *skb = base->data;
834 struct net_device *dev = skb->dev;
835 struct macsec_dev *macsec = macsec_priv(dev);
836 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
837 struct macsec_rx_sc *rx_sc = rx_sa->sc;
838 int len;
839 u32 pn;
840
841 aead_request_free(macsec_skb_cb(skb)->req);
842
843 if (!err)
844 macsec_skb_cb(skb)->valid = true;
845
846 rcu_read_lock_bh();
847 pn = ntohl(macsec_ethhdr(skb)->packet_number);
848 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
849 rcu_read_unlock_bh();
850 kfree_skb(skb);
851 goto out;
852 }
853
854 macsec_finalize_skb(skb, macsec->secy.icv_len,
855 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
856 macsec_reset_skb(skb, macsec->secy.netdev);
857
858 len = skb->len;
859 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
860 count_rx(dev, len);
861
862 rcu_read_unlock_bh();
863
864out:
865 macsec_rxsa_put(rx_sa);
866 macsec_rxsc_put(rx_sc);
867 dev_put(dev);
868}
869
870static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
871 struct net_device *dev,
872 struct macsec_rx_sa *rx_sa,
873 sci_t sci,
874 struct macsec_secy *secy)
875{
876 int ret;
877 struct scatterlist *sg;
878 struct sk_buff *trailer;
879 unsigned char *iv;
880 struct aead_request *req;
881 struct macsec_eth_header *hdr;
882 u32 hdr_pn;
883 u16 icv_len = secy->icv_len;
884
885 macsec_skb_cb(skb)->valid = false;
886 skb = skb_share_check(skb, GFP_ATOMIC);
887 if (!skb)
888 return ERR_PTR(-ENOMEM);
889
890 ret = skb_cow_data(skb, 0, &trailer);
891 if (unlikely(ret < 0)) {
892 kfree_skb(skb);
893 return ERR_PTR(ret);
894 }
895 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
896 if (!req) {
897 kfree_skb(skb);
898 return ERR_PTR(-ENOMEM);
899 }
900
901 hdr = (struct macsec_eth_header *)skb->data;
902 hdr_pn = ntohl(hdr->packet_number);
903
904 if (secy->xpn) {
905 pn_t recovered_pn = rx_sa->next_pn_halves;
906
907 recovered_pn.lower = hdr_pn;
908 if (hdr_pn < rx_sa->next_pn_halves.lower &&
909 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
910 recovered_pn.upper++;
911
912 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
913 rx_sa->key.salt);
914 } else {
915 macsec_fill_iv(iv, sci, hdr_pn);
916 }
917
918 sg_init_table(sg, ret);
919 ret = skb_to_sgvec(skb, sg, 0, skb->len);
920 if (unlikely(ret < 0)) {
921 aead_request_free(req);
922 kfree_skb(skb);
923 return ERR_PTR(ret);
924 }
925
926 if (hdr->tci_an & MACSEC_TCI_E) {
927 /* confidentiality: ethernet + macsec header
928 * authenticated, encrypted payload
929 */
930 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
931
932 aead_request_set_crypt(req, sg, sg, len, iv);
933 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
934 skb = skb_unshare(skb, GFP_ATOMIC);
935 if (!skb) {
936 aead_request_free(req);
937 return ERR_PTR(-ENOMEM);
938 }
939 } else {
940 /* integrity only: all headers + data authenticated */
941 aead_request_set_crypt(req, sg, sg, icv_len, iv);
942 aead_request_set_ad(req, skb->len - icv_len);
943 }
944
945 macsec_skb_cb(skb)->req = req;
946 skb->dev = dev;
947 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
948
949 dev_hold(dev);
950 ret = crypto_aead_decrypt(req);
951 if (ret == -EINPROGRESS) {
952 return ERR_PTR(ret);
953 } else if (ret != 0) {
954 /* decryption/authentication failed
955 * 10.6 if validateFrames is disabled, deliver anyway
956 */
957 if (ret != -EBADMSG) {
958 kfree_skb(skb);
959 skb = ERR_PTR(ret);
960 }
961 } else {
962 macsec_skb_cb(skb)->valid = true;
963 }
964 dev_put(dev);
965
966 aead_request_free(req);
967
968 return skb;
969}
970
971static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
972{
973 struct macsec_rx_sc *rx_sc;
974
975 for_each_rxsc(secy, rx_sc) {
976 if (rx_sc->sci == sci)
977 return rx_sc;
978 }
979
980 return NULL;
981}
982
983static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
984{
985 struct macsec_rx_sc *rx_sc;
986
987 for_each_rxsc_rtnl(secy, rx_sc) {
988 if (rx_sc->sci == sci)
989 return rx_sc;
990 }
991
992 return NULL;
993}
994
995static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
996{
997 /* Deliver to the uncontrolled port by default */
998 enum rx_handler_result ret = RX_HANDLER_PASS;
999 struct ethhdr *hdr = eth_hdr(skb);
1000 struct macsec_rxh_data *rxd;
1001 struct macsec_dev *macsec;
1002
1003 rcu_read_lock();
1004 rxd = macsec_data_rcu(skb->dev);
1005
1006 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1007 struct sk_buff *nskb;
1008 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1009 struct net_device *ndev = macsec->secy.netdev;
1010
1011 /* If h/w offloading is enabled, HW decodes frames and strips
1012 * the SecTAG, so we have to deduce which port to deliver to.
1013 */
1014 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1015 if (ether_addr_equal_64bits(hdr->h_dest,
1016 ndev->dev_addr)) {
1017 /* exact match, divert skb to this port */
1018 skb->dev = ndev;
1019 skb->pkt_type = PACKET_HOST;
1020 ret = RX_HANDLER_ANOTHER;
1021 goto out;
1022 } else if (is_multicast_ether_addr_64bits(
1023 hdr->h_dest)) {
1024 /* multicast frame, deliver on this port too */
1025 nskb = skb_clone(skb, GFP_ATOMIC);
1026 if (!nskb)
1027 break;
1028
1029 nskb->dev = ndev;
1030 if (ether_addr_equal_64bits(hdr->h_dest,
1031 ndev->broadcast))
1032 nskb->pkt_type = PACKET_BROADCAST;
1033 else
1034 nskb->pkt_type = PACKET_MULTICAST;
1035
1036 netif_rx(nskb);
1037 }
1038 continue;
1039 }
1040
1041 /* 10.6 If the management control validateFrames is not
1042 * Strict, frames without a SecTAG are received, counted, and
1043 * delivered to the Controlled Port
1044 */
1045 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1046 u64_stats_update_begin(&secy_stats->syncp);
1047 secy_stats->stats.InPktsNoTag++;
1048 u64_stats_update_end(&secy_stats->syncp);
1049 continue;
1050 }
1051
1052 /* deliver on this port */
1053 nskb = skb_clone(skb, GFP_ATOMIC);
1054 if (!nskb)
1055 break;
1056
1057 nskb->dev = ndev;
1058
1059 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1060 u64_stats_update_begin(&secy_stats->syncp);
1061 secy_stats->stats.InPktsUntagged++;
1062 u64_stats_update_end(&secy_stats->syncp);
1063 }
1064 }
1065
1066out:
1067 rcu_read_unlock();
1068 return ret;
1069}
1070
1071static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1072{
1073 struct sk_buff *skb = *pskb;
1074 struct net_device *dev = skb->dev;
1075 struct macsec_eth_header *hdr;
1076 struct macsec_secy *secy = NULL;
1077 struct macsec_rx_sc *rx_sc;
1078 struct macsec_rx_sa *rx_sa;
1079 struct macsec_rxh_data *rxd;
1080 struct macsec_dev *macsec;
1081 unsigned int len;
1082 sci_t sci;
1083 u32 hdr_pn;
1084 bool cbit;
1085 struct pcpu_rx_sc_stats *rxsc_stats;
1086 struct pcpu_secy_stats *secy_stats;
1087 bool pulled_sci;
1088 int ret;
1089
1090 if (skb_headroom(skb) < ETH_HLEN)
1091 goto drop_direct;
1092
1093 hdr = macsec_ethhdr(skb);
1094 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1095 return handle_not_macsec(skb);
1096
1097 skb = skb_unshare(skb, GFP_ATOMIC);
1098 *pskb = skb;
1099 if (!skb)
1100 return RX_HANDLER_CONSUMED;
1101
1102 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1103 if (!pulled_sci) {
1104 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1105 goto drop_direct;
1106 }
1107
1108 hdr = macsec_ethhdr(skb);
1109
1110 /* Frames with a SecTAG that has the TCI E bit set but the C
1111 * bit clear are discarded, as this reserved encoding is used
1112 * to identify frames with a SecTAG that are not to be
1113 * delivered to the Controlled Port.
1114 */
1115 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1116 return RX_HANDLER_PASS;
1117
1118 /* now, pull the extra length */
1119 if (hdr->tci_an & MACSEC_TCI_SC) {
1120 if (!pulled_sci)
1121 goto drop_direct;
1122 }
1123
1124 /* ethernet header is part of crypto processing */
1125 skb_push(skb, ETH_HLEN);
1126
1127 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1128 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1129 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1130
1131 rcu_read_lock();
1132 rxd = macsec_data_rcu(skb->dev);
1133
1134 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1135 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1136
1137 sc = sc ? macsec_rxsc_get(sc) : NULL;
1138
1139 if (sc) {
1140 secy = &macsec->secy;
1141 rx_sc = sc;
1142 break;
1143 }
1144 }
1145
1146 if (!secy)
1147 goto nosci;
1148
1149 dev = secy->netdev;
1150 macsec = macsec_priv(dev);
1151 secy_stats = this_cpu_ptr(macsec->stats);
1152 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1153
1154 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1155 u64_stats_update_begin(&secy_stats->syncp);
1156 secy_stats->stats.InPktsBadTag++;
1157 u64_stats_update_end(&secy_stats->syncp);
1158 goto drop_nosa;
1159 }
1160
1161 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1162 if (!rx_sa) {
1163 /* 10.6.1 if the SA is not in use */
1164
1165 /* If validateFrames is Strict or the C bit in the
1166 * SecTAG is set, discard
1167 */
1168 if (hdr->tci_an & MACSEC_TCI_C ||
1169 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1170 u64_stats_update_begin(&rxsc_stats->syncp);
1171 rxsc_stats->stats.InPktsNotUsingSA++;
1172 u64_stats_update_end(&rxsc_stats->syncp);
1173 goto drop_nosa;
1174 }
1175
1176 /* not Strict, the frame (with the SecTAG and ICV
1177 * removed) is delivered to the Controlled Port.
1178 */
1179 u64_stats_update_begin(&rxsc_stats->syncp);
1180 rxsc_stats->stats.InPktsUnusedSA++;
1181 u64_stats_update_end(&rxsc_stats->syncp);
1182 goto deliver;
1183 }
1184
1185 /* First, PN check to avoid decrypting obviously wrong packets */
1186 hdr_pn = ntohl(hdr->packet_number);
1187 if (secy->replay_protect) {
1188 bool late;
1189
1190 spin_lock(&rx_sa->lock);
1191 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1192 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1193
1194 if (secy->xpn)
1195 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1196 spin_unlock(&rx_sa->lock);
1197
1198 if (late) {
1199 u64_stats_update_begin(&rxsc_stats->syncp);
1200 rxsc_stats->stats.InPktsLate++;
1201 u64_stats_update_end(&rxsc_stats->syncp);
1202 goto drop;
1203 }
1204 }
1205
1206 macsec_skb_cb(skb)->rx_sa = rx_sa;
1207
1208 /* Disabled && !changed text => skip validation */
1209 if (hdr->tci_an & MACSEC_TCI_C ||
1210 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1211 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1212
1213 if (IS_ERR(skb)) {
1214 /* the decrypt callback needs the reference */
1215 if (PTR_ERR(skb) != -EINPROGRESS) {
1216 macsec_rxsa_put(rx_sa);
1217 macsec_rxsc_put(rx_sc);
1218 }
1219 rcu_read_unlock();
1220 *pskb = NULL;
1221 return RX_HANDLER_CONSUMED;
1222 }
1223
1224 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1225 goto drop;
1226
1227deliver:
1228 macsec_finalize_skb(skb, secy->icv_len,
1229 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1230 macsec_reset_skb(skb, secy->netdev);
1231
1232 if (rx_sa)
1233 macsec_rxsa_put(rx_sa);
1234 macsec_rxsc_put(rx_sc);
1235
1236 skb_orphan(skb);
1237 len = skb->len;
1238 ret = gro_cells_receive(&macsec->gro_cells, skb);
1239 if (ret == NET_RX_SUCCESS)
1240 count_rx(dev, len);
1241 else
1242 macsec->secy.netdev->stats.rx_dropped++;
1243
1244 rcu_read_unlock();
1245
1246 *pskb = NULL;
1247 return RX_HANDLER_CONSUMED;
1248
1249drop:
1250 macsec_rxsa_put(rx_sa);
1251drop_nosa:
1252 macsec_rxsc_put(rx_sc);
1253 rcu_read_unlock();
1254drop_direct:
1255 kfree_skb(skb);
1256 *pskb = NULL;
1257 return RX_HANDLER_CONSUMED;
1258
1259nosci:
1260 /* 10.6.1 if the SC is not found */
1261 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1262 if (!cbit)
1263 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1264 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1265
1266 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1267 struct sk_buff *nskb;
1268
1269 secy_stats = this_cpu_ptr(macsec->stats);
1270
1271 /* If validateFrames is Strict or the C bit in the
1272 * SecTAG is set, discard
1273 */
1274 if (cbit ||
1275 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1276 u64_stats_update_begin(&secy_stats->syncp);
1277 secy_stats->stats.InPktsNoSCI++;
1278 u64_stats_update_end(&secy_stats->syncp);
1279 continue;
1280 }
1281
1282 /* not strict, the frame (with the SecTAG and ICV
1283 * removed) is delivered to the Controlled Port.
1284 */
1285 nskb = skb_clone(skb, GFP_ATOMIC);
1286 if (!nskb)
1287 break;
1288
1289 macsec_reset_skb(nskb, macsec->secy.netdev);
1290
1291 ret = netif_rx(nskb);
1292 if (ret == NET_RX_SUCCESS) {
1293 u64_stats_update_begin(&secy_stats->syncp);
1294 secy_stats->stats.InPktsUnknownSCI++;
1295 u64_stats_update_end(&secy_stats->syncp);
1296 } else {
1297 macsec->secy.netdev->stats.rx_dropped++;
1298 }
1299 }
1300
1301 rcu_read_unlock();
1302 *pskb = skb;
1303 return RX_HANDLER_PASS;
1304}
1305
1306static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1307{
1308 struct crypto_aead *tfm;
1309 int ret;
1310
1311 /* Pick a sync gcm(aes) cipher to ensure order is preserved. */
1312 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1313
1314 if (IS_ERR(tfm))
1315 return tfm;
1316
1317 ret = crypto_aead_setkey(tfm, key, key_len);
1318 if (ret < 0)
1319 goto fail;
1320
1321 ret = crypto_aead_setauthsize(tfm, icv_len);
1322 if (ret < 0)
1323 goto fail;
1324
1325 return tfm;
1326fail:
1327 crypto_free_aead(tfm);
1328 return ERR_PTR(ret);
1329}
1330
1331static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1332 int icv_len)
1333{
1334 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1335 if (!rx_sa->stats)
1336 return -ENOMEM;
1337
1338 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1339 if (IS_ERR(rx_sa->key.tfm)) {
1340 free_percpu(rx_sa->stats);
1341 return PTR_ERR(rx_sa->key.tfm);
1342 }
1343
1344 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1345 rx_sa->active = false;
1346 rx_sa->next_pn = 1;
1347 refcount_set(&rx_sa->refcnt, 1);
1348 spin_lock_init(&rx_sa->lock);
1349
1350 return 0;
1351}
1352
1353static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1354{
1355 rx_sa->active = false;
1356
1357 macsec_rxsa_put(rx_sa);
1358}
1359
1360static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1361{
1362 int i;
1363
1364 for (i = 0; i < MACSEC_NUM_AN; i++) {
1365 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1366
1367 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1368 if (sa)
1369 clear_rx_sa(sa);
1370 }
1371
1372 macsec_rxsc_put(rx_sc);
1373}
1374
1375static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1376{
1377 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1378
1379 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1380 rx_sc;
1381 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1382 if (rx_sc->sci == sci) {
1383 if (rx_sc->active)
1384 secy->n_rx_sc--;
1385 rcu_assign_pointer(*rx_scp, rx_sc->next);
1386 return rx_sc;
1387 }
1388 }
1389
1390 return NULL;
1391}
1392
1393static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1394{
1395 struct macsec_rx_sc *rx_sc;
1396 struct macsec_dev *macsec;
1397 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1398 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1399 struct macsec_secy *secy;
1400
1401 list_for_each_entry(macsec, &rxd->secys, secys) {
1402 if (find_rx_sc_rtnl(&macsec->secy, sci))
1403 return ERR_PTR(-EEXIST);
1404 }
1405
1406 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1407 if (!rx_sc)
1408 return ERR_PTR(-ENOMEM);
1409
1410 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1411 if (!rx_sc->stats) {
1412 kfree(rx_sc);
1413 return ERR_PTR(-ENOMEM);
1414 }
1415
1416 rx_sc->sci = sci;
1417 rx_sc->active = true;
1418 refcount_set(&rx_sc->refcnt, 1);
1419
1420 secy = &macsec_priv(dev)->secy;
1421 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1422 rcu_assign_pointer(secy->rx_sc, rx_sc);
1423
1424 if (rx_sc->active)
1425 secy->n_rx_sc++;
1426
1427 return rx_sc;
1428}
1429
1430static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1431 int icv_len)
1432{
1433 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1434 if (!tx_sa->stats)
1435 return -ENOMEM;
1436
1437 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1438 if (IS_ERR(tx_sa->key.tfm)) {
1439 free_percpu(tx_sa->stats);
1440 return PTR_ERR(tx_sa->key.tfm);
1441 }
1442
1443 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1444 tx_sa->active = false;
1445 refcount_set(&tx_sa->refcnt, 1);
1446 spin_lock_init(&tx_sa->lock);
1447
1448 return 0;
1449}
1450
1451static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1452{
1453 tx_sa->active = false;
1454
1455 macsec_txsa_put(tx_sa);
1456}
1457
1458static struct genl_family macsec_fam;
1459
1460static struct net_device *get_dev_from_nl(struct net *net,
1461 struct nlattr **attrs)
1462{
1463 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1464 struct net_device *dev;
1465
1466 dev = __dev_get_by_index(net, ifindex);
1467 if (!dev)
1468 return ERR_PTR(-ENODEV);
1469
1470 if (!netif_is_macsec(dev))
1471 return ERR_PTR(-ENODEV);
1472
1473 return dev;
1474}
1475
1476static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1477{
1478 return (__force enum macsec_offload)nla_get_u8(nla);
1479}
1480
1481static sci_t nla_get_sci(const struct nlattr *nla)
1482{
1483 return (__force sci_t)nla_get_u64(nla);
1484}
1485
1486static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1487 int padattr)
1488{
1489 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1490}
1491
1492static ssci_t nla_get_ssci(const struct nlattr *nla)
1493{
1494 return (__force ssci_t)nla_get_u32(nla);
1495}
1496
1497static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1498{
1499 return nla_put_u32(skb, attrtype, (__force u64)value);
1500}
1501
1502static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1503 struct nlattr **attrs,
1504 struct nlattr **tb_sa,
1505 struct net_device **devp,
1506 struct macsec_secy **secyp,
1507 struct macsec_tx_sc **scp,
1508 u8 *assoc_num)
1509{
1510 struct net_device *dev;
1511 struct macsec_secy *secy;
1512 struct macsec_tx_sc *tx_sc;
1513 struct macsec_tx_sa *tx_sa;
1514
1515 if (!tb_sa[MACSEC_SA_ATTR_AN])
1516 return ERR_PTR(-EINVAL);
1517
1518 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1519
1520 dev = get_dev_from_nl(net, attrs);
1521 if (IS_ERR(dev))
1522 return ERR_CAST(dev);
1523
1524 if (*assoc_num >= MACSEC_NUM_AN)
1525 return ERR_PTR(-EINVAL);
1526
1527 secy = &macsec_priv(dev)->secy;
1528 tx_sc = &secy->tx_sc;
1529
1530 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1531 if (!tx_sa)
1532 return ERR_PTR(-ENODEV);
1533
1534 *devp = dev;
1535 *scp = tx_sc;
1536 *secyp = secy;
1537 return tx_sa;
1538}
1539
1540static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1541 struct nlattr **attrs,
1542 struct nlattr **tb_rxsc,
1543 struct net_device **devp,
1544 struct macsec_secy **secyp)
1545{
1546 struct net_device *dev;
1547 struct macsec_secy *secy;
1548 struct macsec_rx_sc *rx_sc;
1549 sci_t sci;
1550
1551 dev = get_dev_from_nl(net, attrs);
1552 if (IS_ERR(dev))
1553 return ERR_CAST(dev);
1554
1555 secy = &macsec_priv(dev)->secy;
1556
1557 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1558 return ERR_PTR(-EINVAL);
1559
1560 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1561 rx_sc = find_rx_sc_rtnl(secy, sci);
1562 if (!rx_sc)
1563 return ERR_PTR(-ENODEV);
1564
1565 *secyp = secy;
1566 *devp = dev;
1567
1568 return rx_sc;
1569}
1570
1571static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1572 struct nlattr **attrs,
1573 struct nlattr **tb_rxsc,
1574 struct nlattr **tb_sa,
1575 struct net_device **devp,
1576 struct macsec_secy **secyp,
1577 struct macsec_rx_sc **scp,
1578 u8 *assoc_num)
1579{
1580 struct macsec_rx_sc *rx_sc;
1581 struct macsec_rx_sa *rx_sa;
1582
1583 if (!tb_sa[MACSEC_SA_ATTR_AN])
1584 return ERR_PTR(-EINVAL);
1585
1586 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1587 if (*assoc_num >= MACSEC_NUM_AN)
1588 return ERR_PTR(-EINVAL);
1589
1590 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1591 if (IS_ERR(rx_sc))
1592 return ERR_CAST(rx_sc);
1593
1594 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1595 if (!rx_sa)
1596 return ERR_PTR(-ENODEV);
1597
1598 *scp = rx_sc;
1599 return rx_sa;
1600}
1601
1602static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1603 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1604 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1605 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1606 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1607};
1608
1609static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1610 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1611 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1612};
1613
1614static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1615 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1616 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1617 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1618 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1619 .len = MACSEC_KEYID_LEN, },
1620 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1621 .len = MACSEC_MAX_KEY_LEN, },
1622 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1623 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1624 .len = MACSEC_SALT_LEN, },
1625};
1626
1627static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1628 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1629};
1630
1631/* Offloads an operation to a device driver */
1632static int macsec_offload(int (* const func)(struct macsec_context *),
1633 struct macsec_context *ctx)
1634{
1635 int ret;
1636
1637 if (unlikely(!func))
1638 return 0;
1639
1640 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1641 mutex_lock(&ctx->phydev->lock);
1642
1643 /* Phase I: prepare. The drive should fail here if there are going to be
1644 * issues in the commit phase.
1645 */
1646 ctx->prepare = true;
1647 ret = (*func)(ctx);
1648 if (ret)
1649 goto phy_unlock;
1650
1651 /* Phase II: commit. This step cannot fail. */
1652 ctx->prepare = false;
1653 ret = (*func)(ctx);
1654 /* This should never happen: commit is not allowed to fail */
1655 if (unlikely(ret))
1656 WARN(1, "MACsec offloading commit failed (%d)\n", ret);
1657
1658phy_unlock:
1659 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1660 mutex_unlock(&ctx->phydev->lock);
1661
1662 return ret;
1663}
1664
1665static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1666{
1667 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1668 return -EINVAL;
1669
1670 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1671 return -EINVAL;
1672
1673 return 0;
1674}
1675
1676static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1677{
1678 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1679 return -EINVAL;
1680
1681 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1682 return -EINVAL;
1683
1684 return 0;
1685}
1686
1687static bool validate_add_rxsa(struct nlattr **attrs)
1688{
1689 if (!attrs[MACSEC_SA_ATTR_AN] ||
1690 !attrs[MACSEC_SA_ATTR_KEY] ||
1691 !attrs[MACSEC_SA_ATTR_KEYID])
1692 return false;
1693
1694 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1695 return false;
1696
1697 if (attrs[MACSEC_SA_ATTR_PN] &&
1698 *(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0)
1699 return false;
1700
1701 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1702 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1703 return false;
1704 }
1705
1706 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1707 return false;
1708
1709 return true;
1710}
1711
1712static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1713{
1714 struct net_device *dev;
1715 struct nlattr **attrs = info->attrs;
1716 struct macsec_secy *secy;
1717 struct macsec_rx_sc *rx_sc;
1718 struct macsec_rx_sa *rx_sa;
1719 unsigned char assoc_num;
1720 int pn_len;
1721 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1722 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1723 int err;
1724
1725 if (!attrs[MACSEC_ATTR_IFINDEX])
1726 return -EINVAL;
1727
1728 if (parse_sa_config(attrs, tb_sa))
1729 return -EINVAL;
1730
1731 if (parse_rxsc_config(attrs, tb_rxsc))
1732 return -EINVAL;
1733
1734 if (!validate_add_rxsa(tb_sa))
1735 return -EINVAL;
1736
1737 rtnl_lock();
1738 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1739 if (IS_ERR(rx_sc)) {
1740 rtnl_unlock();
1741 return PTR_ERR(rx_sc);
1742 }
1743
1744 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1745
1746 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1747 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1748 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1749 rtnl_unlock();
1750 return -EINVAL;
1751 }
1752
1753 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1754 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1755 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1756 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1757 rtnl_unlock();
1758 return -EINVAL;
1759 }
1760
1761 if (secy->xpn) {
1762 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1763 rtnl_unlock();
1764 return -EINVAL;
1765 }
1766
1767 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1768 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1769 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1770 MACSEC_SA_ATTR_SALT);
1771 rtnl_unlock();
1772 return -EINVAL;
1773 }
1774 }
1775
1776 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1777 if (rx_sa) {
1778 rtnl_unlock();
1779 return -EBUSY;
1780 }
1781
1782 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1783 if (!rx_sa) {
1784 rtnl_unlock();
1785 return -ENOMEM;
1786 }
1787
1788 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1789 secy->key_len, secy->icv_len);
1790 if (err < 0) {
1791 kfree(rx_sa);
1792 rtnl_unlock();
1793 return err;
1794 }
1795
1796 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1797 spin_lock_bh(&rx_sa->lock);
1798 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1799 spin_unlock_bh(&rx_sa->lock);
1800 }
1801
1802 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1803 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1804
1805 rx_sa->sc = rx_sc;
1806
1807 /* If h/w offloading is available, propagate to the device */
1808 if (macsec_is_offloaded(netdev_priv(dev))) {
1809 const struct macsec_ops *ops;
1810 struct macsec_context ctx;
1811
1812 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1813 if (!ops) {
1814 err = -EOPNOTSUPP;
1815 goto cleanup;
1816 }
1817
1818 ctx.sa.assoc_num = assoc_num;
1819 ctx.sa.rx_sa = rx_sa;
1820 ctx.secy = secy;
1821 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1822 secy->key_len);
1823
1824 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1825 if (err)
1826 goto cleanup;
1827 }
1828
1829 if (secy->xpn) {
1830 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1831 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1832 MACSEC_SALT_LEN);
1833 }
1834
1835 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1836 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1837
1838 rtnl_unlock();
1839
1840 return 0;
1841
1842cleanup:
1843 kfree(rx_sa);
1844 rtnl_unlock();
1845 return err;
1846}
1847
1848static bool validate_add_rxsc(struct nlattr **attrs)
1849{
1850 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1851 return false;
1852
1853 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1854 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1855 return false;
1856 }
1857
1858 return true;
1859}
1860
1861static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1862{
1863 struct net_device *dev;
1864 sci_t sci = MACSEC_UNDEF_SCI;
1865 struct nlattr **attrs = info->attrs;
1866 struct macsec_rx_sc *rx_sc;
1867 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1868 struct macsec_secy *secy;
1869 bool was_active;
1870 int ret;
1871
1872 if (!attrs[MACSEC_ATTR_IFINDEX])
1873 return -EINVAL;
1874
1875 if (parse_rxsc_config(attrs, tb_rxsc))
1876 return -EINVAL;
1877
1878 if (!validate_add_rxsc(tb_rxsc))
1879 return -EINVAL;
1880
1881 rtnl_lock();
1882 dev = get_dev_from_nl(genl_info_net(info), attrs);
1883 if (IS_ERR(dev)) {
1884 rtnl_unlock();
1885 return PTR_ERR(dev);
1886 }
1887
1888 secy = &macsec_priv(dev)->secy;
1889 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1890
1891 rx_sc = create_rx_sc(dev, sci);
1892 if (IS_ERR(rx_sc)) {
1893 rtnl_unlock();
1894 return PTR_ERR(rx_sc);
1895 }
1896
1897 was_active = rx_sc->active;
1898 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1899 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1900
1901 if (macsec_is_offloaded(netdev_priv(dev))) {
1902 const struct macsec_ops *ops;
1903 struct macsec_context ctx;
1904
1905 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1906 if (!ops) {
1907 ret = -EOPNOTSUPP;
1908 goto cleanup;
1909 }
1910
1911 ctx.rx_sc = rx_sc;
1912 ctx.secy = secy;
1913
1914 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1915 if (ret)
1916 goto cleanup;
1917 }
1918
1919 rtnl_unlock();
1920
1921 return 0;
1922
1923cleanup:
1924 rx_sc->active = was_active;
1925 rtnl_unlock();
1926 return ret;
1927}
1928
1929static bool validate_add_txsa(struct nlattr **attrs)
1930{
1931 if (!attrs[MACSEC_SA_ATTR_AN] ||
1932 !attrs[MACSEC_SA_ATTR_PN] ||
1933 !attrs[MACSEC_SA_ATTR_KEY] ||
1934 !attrs[MACSEC_SA_ATTR_KEYID])
1935 return false;
1936
1937 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1938 return false;
1939
1940 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1941 return false;
1942
1943 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1944 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1945 return false;
1946 }
1947
1948 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1949 return false;
1950
1951 return true;
1952}
1953
1954static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1955{
1956 struct net_device *dev;
1957 struct nlattr **attrs = info->attrs;
1958 struct macsec_secy *secy;
1959 struct macsec_tx_sc *tx_sc;
1960 struct macsec_tx_sa *tx_sa;
1961 unsigned char assoc_num;
1962 int pn_len;
1963 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1964 bool was_operational;
1965 int err;
1966
1967 if (!attrs[MACSEC_ATTR_IFINDEX])
1968 return -EINVAL;
1969
1970 if (parse_sa_config(attrs, tb_sa))
1971 return -EINVAL;
1972
1973 if (!validate_add_txsa(tb_sa))
1974 return -EINVAL;
1975
1976 rtnl_lock();
1977 dev = get_dev_from_nl(genl_info_net(info), attrs);
1978 if (IS_ERR(dev)) {
1979 rtnl_unlock();
1980 return PTR_ERR(dev);
1981 }
1982
1983 secy = &macsec_priv(dev)->secy;
1984 tx_sc = &secy->tx_sc;
1985
1986 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1987
1988 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1989 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1990 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1991 rtnl_unlock();
1992 return -EINVAL;
1993 }
1994
1995 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1996 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1997 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
1998 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1999 rtnl_unlock();
2000 return -EINVAL;
2001 }
2002
2003 if (secy->xpn) {
2004 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2005 rtnl_unlock();
2006 return -EINVAL;
2007 }
2008
2009 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2010 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2011 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2012 MACSEC_SA_ATTR_SALT);
2013 rtnl_unlock();
2014 return -EINVAL;
2015 }
2016 }
2017
2018 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2019 if (tx_sa) {
2020 rtnl_unlock();
2021 return -EBUSY;
2022 }
2023
2024 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2025 if (!tx_sa) {
2026 rtnl_unlock();
2027 return -ENOMEM;
2028 }
2029
2030 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2031 secy->key_len, secy->icv_len);
2032 if (err < 0) {
2033 kfree(tx_sa);
2034 rtnl_unlock();
2035 return err;
2036 }
2037
2038 spin_lock_bh(&tx_sa->lock);
2039 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2040 spin_unlock_bh(&tx_sa->lock);
2041
2042 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2043 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2044
2045 was_operational = secy->operational;
2046 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2047 secy->operational = true;
2048
2049 /* If h/w offloading is available, propagate to the device */
2050 if (macsec_is_offloaded(netdev_priv(dev))) {
2051 const struct macsec_ops *ops;
2052 struct macsec_context ctx;
2053
2054 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2055 if (!ops) {
2056 err = -EOPNOTSUPP;
2057 goto cleanup;
2058 }
2059
2060 ctx.sa.assoc_num = assoc_num;
2061 ctx.sa.tx_sa = tx_sa;
2062 ctx.secy = secy;
2063 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2064 secy->key_len);
2065
2066 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2067 if (err)
2068 goto cleanup;
2069 }
2070
2071 if (secy->xpn) {
2072 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2073 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2074 MACSEC_SALT_LEN);
2075 }
2076
2077 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2078 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2079
2080 rtnl_unlock();
2081
2082 return 0;
2083
2084cleanup:
2085 secy->operational = was_operational;
2086 kfree(tx_sa);
2087 rtnl_unlock();
2088 return err;
2089}
2090
2091static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2092{
2093 struct nlattr **attrs = info->attrs;
2094 struct net_device *dev;
2095 struct macsec_secy *secy;
2096 struct macsec_rx_sc *rx_sc;
2097 struct macsec_rx_sa *rx_sa;
2098 u8 assoc_num;
2099 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2100 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2101 int ret;
2102
2103 if (!attrs[MACSEC_ATTR_IFINDEX])
2104 return -EINVAL;
2105
2106 if (parse_sa_config(attrs, tb_sa))
2107 return -EINVAL;
2108
2109 if (parse_rxsc_config(attrs, tb_rxsc))
2110 return -EINVAL;
2111
2112 rtnl_lock();
2113 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2114 &dev, &secy, &rx_sc, &assoc_num);
2115 if (IS_ERR(rx_sa)) {
2116 rtnl_unlock();
2117 return PTR_ERR(rx_sa);
2118 }
2119
2120 if (rx_sa->active) {
2121 rtnl_unlock();
2122 return -EBUSY;
2123 }
2124
2125 /* If h/w offloading is available, propagate to the device */
2126 if (macsec_is_offloaded(netdev_priv(dev))) {
2127 const struct macsec_ops *ops;
2128 struct macsec_context ctx;
2129
2130 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2131 if (!ops) {
2132 ret = -EOPNOTSUPP;
2133 goto cleanup;
2134 }
2135
2136 ctx.sa.assoc_num = assoc_num;
2137 ctx.sa.rx_sa = rx_sa;
2138 ctx.secy = secy;
2139
2140 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2141 if (ret)
2142 goto cleanup;
2143 }
2144
2145 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2146 clear_rx_sa(rx_sa);
2147
2148 rtnl_unlock();
2149
2150 return 0;
2151
2152cleanup:
2153 rtnl_unlock();
2154 return ret;
2155}
2156
2157static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2158{
2159 struct nlattr **attrs = info->attrs;
2160 struct net_device *dev;
2161 struct macsec_secy *secy;
2162 struct macsec_rx_sc *rx_sc;
2163 sci_t sci;
2164 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2165 int ret;
2166
2167 if (!attrs[MACSEC_ATTR_IFINDEX])
2168 return -EINVAL;
2169
2170 if (parse_rxsc_config(attrs, tb_rxsc))
2171 return -EINVAL;
2172
2173 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2174 return -EINVAL;
2175
2176 rtnl_lock();
2177 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2178 if (IS_ERR(dev)) {
2179 rtnl_unlock();
2180 return PTR_ERR(dev);
2181 }
2182
2183 secy = &macsec_priv(dev)->secy;
2184 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2185
2186 rx_sc = del_rx_sc(secy, sci);
2187 if (!rx_sc) {
2188 rtnl_unlock();
2189 return -ENODEV;
2190 }
2191
2192 /* If h/w offloading is available, propagate to the device */
2193 if (macsec_is_offloaded(netdev_priv(dev))) {
2194 const struct macsec_ops *ops;
2195 struct macsec_context ctx;
2196
2197 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2198 if (!ops) {
2199 ret = -EOPNOTSUPP;
2200 goto cleanup;
2201 }
2202
2203 ctx.rx_sc = rx_sc;
2204 ctx.secy = secy;
2205 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2206 if (ret)
2207 goto cleanup;
2208 }
2209
2210 free_rx_sc(rx_sc);
2211 rtnl_unlock();
2212
2213 return 0;
2214
2215cleanup:
2216 rtnl_unlock();
2217 return ret;
2218}
2219
2220static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2221{
2222 struct nlattr **attrs = info->attrs;
2223 struct net_device *dev;
2224 struct macsec_secy *secy;
2225 struct macsec_tx_sc *tx_sc;
2226 struct macsec_tx_sa *tx_sa;
2227 u8 assoc_num;
2228 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2229 int ret;
2230
2231 if (!attrs[MACSEC_ATTR_IFINDEX])
2232 return -EINVAL;
2233
2234 if (parse_sa_config(attrs, tb_sa))
2235 return -EINVAL;
2236
2237 rtnl_lock();
2238 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2239 &dev, &secy, &tx_sc, &assoc_num);
2240 if (IS_ERR(tx_sa)) {
2241 rtnl_unlock();
2242 return PTR_ERR(tx_sa);
2243 }
2244
2245 if (tx_sa->active) {
2246 rtnl_unlock();
2247 return -EBUSY;
2248 }
2249
2250 /* If h/w offloading is available, propagate to the device */
2251 if (macsec_is_offloaded(netdev_priv(dev))) {
2252 const struct macsec_ops *ops;
2253 struct macsec_context ctx;
2254
2255 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2256 if (!ops) {
2257 ret = -EOPNOTSUPP;
2258 goto cleanup;
2259 }
2260
2261 ctx.sa.assoc_num = assoc_num;
2262 ctx.sa.tx_sa = tx_sa;
2263 ctx.secy = secy;
2264
2265 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2266 if (ret)
2267 goto cleanup;
2268 }
2269
2270 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2271 clear_tx_sa(tx_sa);
2272
2273 rtnl_unlock();
2274
2275 return 0;
2276
2277cleanup:
2278 rtnl_unlock();
2279 return ret;
2280}
2281
2282static bool validate_upd_sa(struct nlattr **attrs)
2283{
2284 if (!attrs[MACSEC_SA_ATTR_AN] ||
2285 attrs[MACSEC_SA_ATTR_KEY] ||
2286 attrs[MACSEC_SA_ATTR_KEYID] ||
2287 attrs[MACSEC_SA_ATTR_SSCI] ||
2288 attrs[MACSEC_SA_ATTR_SALT])
2289 return false;
2290
2291 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2292 return false;
2293
2294 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2295 return false;
2296
2297 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2298 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2299 return false;
2300 }
2301
2302 return true;
2303}
2304
2305static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2306{
2307 struct nlattr **attrs = info->attrs;
2308 struct net_device *dev;
2309 struct macsec_secy *secy;
2310 struct macsec_tx_sc *tx_sc;
2311 struct macsec_tx_sa *tx_sa;
2312 u8 assoc_num;
2313 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2314 bool was_operational, was_active;
2315 pn_t prev_pn;
2316 int ret = 0;
2317
2318 prev_pn.full64 = 0;
2319
2320 if (!attrs[MACSEC_ATTR_IFINDEX])
2321 return -EINVAL;
2322
2323 if (parse_sa_config(attrs, tb_sa))
2324 return -EINVAL;
2325
2326 if (!validate_upd_sa(tb_sa))
2327 return -EINVAL;
2328
2329 rtnl_lock();
2330 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2331 &dev, &secy, &tx_sc, &assoc_num);
2332 if (IS_ERR(tx_sa)) {
2333 rtnl_unlock();
2334 return PTR_ERR(tx_sa);
2335 }
2336
2337 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2338 int pn_len;
2339
2340 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2341 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2342 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2343 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2344 rtnl_unlock();
2345 return -EINVAL;
2346 }
2347
2348 spin_lock_bh(&tx_sa->lock);
2349 prev_pn = tx_sa->next_pn_halves;
2350 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2351 spin_unlock_bh(&tx_sa->lock);
2352 }
2353
2354 was_active = tx_sa->active;
2355 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2356 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2357
2358 was_operational = secy->operational;
2359 if (assoc_num == tx_sc->encoding_sa)
2360 secy->operational = tx_sa->active;
2361
2362 /* If h/w offloading is available, propagate to the device */
2363 if (macsec_is_offloaded(netdev_priv(dev))) {
2364 const struct macsec_ops *ops;
2365 struct macsec_context ctx;
2366
2367 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2368 if (!ops) {
2369 ret = -EOPNOTSUPP;
2370 goto cleanup;
2371 }
2372
2373 ctx.sa.assoc_num = assoc_num;
2374 ctx.sa.tx_sa = tx_sa;
2375 ctx.secy = secy;
2376
2377 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2378 if (ret)
2379 goto cleanup;
2380 }
2381
2382 rtnl_unlock();
2383
2384 return 0;
2385
2386cleanup:
2387 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2388 spin_lock_bh(&tx_sa->lock);
2389 tx_sa->next_pn_halves = prev_pn;
2390 spin_unlock_bh(&tx_sa->lock);
2391 }
2392 tx_sa->active = was_active;
2393 secy->operational = was_operational;
2394 rtnl_unlock();
2395 return ret;
2396}
2397
2398static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2399{
2400 struct nlattr **attrs = info->attrs;
2401 struct net_device *dev;
2402 struct macsec_secy *secy;
2403 struct macsec_rx_sc *rx_sc;
2404 struct macsec_rx_sa *rx_sa;
2405 u8 assoc_num;
2406 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2407 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2408 bool was_active;
2409 pn_t prev_pn;
2410 int ret = 0;
2411
2412 prev_pn.full64 = 0;
2413
2414 if (!attrs[MACSEC_ATTR_IFINDEX])
2415 return -EINVAL;
2416
2417 if (parse_rxsc_config(attrs, tb_rxsc))
2418 return -EINVAL;
2419
2420 if (parse_sa_config(attrs, tb_sa))
2421 return -EINVAL;
2422
2423 if (!validate_upd_sa(tb_sa))
2424 return -EINVAL;
2425
2426 rtnl_lock();
2427 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2428 &dev, &secy, &rx_sc, &assoc_num);
2429 if (IS_ERR(rx_sa)) {
2430 rtnl_unlock();
2431 return PTR_ERR(rx_sa);
2432 }
2433
2434 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2435 int pn_len;
2436
2437 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2438 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2439 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2440 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2441 rtnl_unlock();
2442 return -EINVAL;
2443 }
2444
2445 spin_lock_bh(&rx_sa->lock);
2446 prev_pn = rx_sa->next_pn_halves;
2447 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2448 spin_unlock_bh(&rx_sa->lock);
2449 }
2450
2451 was_active = rx_sa->active;
2452 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2453 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2454
2455 /* If h/w offloading is available, propagate to the device */
2456 if (macsec_is_offloaded(netdev_priv(dev))) {
2457 const struct macsec_ops *ops;
2458 struct macsec_context ctx;
2459
2460 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2461 if (!ops) {
2462 ret = -EOPNOTSUPP;
2463 goto cleanup;
2464 }
2465
2466 ctx.sa.assoc_num = assoc_num;
2467 ctx.sa.rx_sa = rx_sa;
2468 ctx.secy = secy;
2469
2470 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2471 if (ret)
2472 goto cleanup;
2473 }
2474
2475 rtnl_unlock();
2476 return 0;
2477
2478cleanup:
2479 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2480 spin_lock_bh(&rx_sa->lock);
2481 rx_sa->next_pn_halves = prev_pn;
2482 spin_unlock_bh(&rx_sa->lock);
2483 }
2484 rx_sa->active = was_active;
2485 rtnl_unlock();
2486 return ret;
2487}
2488
2489static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2490{
2491 struct nlattr **attrs = info->attrs;
2492 struct net_device *dev;
2493 struct macsec_secy *secy;
2494 struct macsec_rx_sc *rx_sc;
2495 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2496 unsigned int prev_n_rx_sc;
2497 bool was_active;
2498 int ret;
2499
2500 if (!attrs[MACSEC_ATTR_IFINDEX])
2501 return -EINVAL;
2502
2503 if (parse_rxsc_config(attrs, tb_rxsc))
2504 return -EINVAL;
2505
2506 if (!validate_add_rxsc(tb_rxsc))
2507 return -EINVAL;
2508
2509 rtnl_lock();
2510 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2511 if (IS_ERR(rx_sc)) {
2512 rtnl_unlock();
2513 return PTR_ERR(rx_sc);
2514 }
2515
2516 was_active = rx_sc->active;
2517 prev_n_rx_sc = secy->n_rx_sc;
2518 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2519 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2520
2521 if (rx_sc->active != new)
2522 secy->n_rx_sc += new ? 1 : -1;
2523
2524 rx_sc->active = new;
2525 }
2526
2527 /* If h/w offloading is available, propagate to the device */
2528 if (macsec_is_offloaded(netdev_priv(dev))) {
2529 const struct macsec_ops *ops;
2530 struct macsec_context ctx;
2531
2532 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2533 if (!ops) {
2534 ret = -EOPNOTSUPP;
2535 goto cleanup;
2536 }
2537
2538 ctx.rx_sc = rx_sc;
2539 ctx.secy = secy;
2540
2541 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2542 if (ret)
2543 goto cleanup;
2544 }
2545
2546 rtnl_unlock();
2547
2548 return 0;
2549
2550cleanup:
2551 secy->n_rx_sc = prev_n_rx_sc;
2552 rx_sc->active = was_active;
2553 rtnl_unlock();
2554 return ret;
2555}
2556
2557static bool macsec_is_configured(struct macsec_dev *macsec)
2558{
2559 struct macsec_secy *secy = &macsec->secy;
2560 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2561 int i;
2562
2563 if (secy->n_rx_sc > 0)
2564 return true;
2565
2566 for (i = 0; i < MACSEC_NUM_AN; i++)
2567 if (tx_sc->sa[i])
2568 return true;
2569
2570 return false;
2571}
2572
2573static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2574{
2575 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2576 enum macsec_offload offload, prev_offload;
2577 int (*func)(struct macsec_context *ctx);
2578 struct nlattr **attrs = info->attrs;
2579 struct net_device *dev;
2580 const struct macsec_ops *ops;
2581 struct macsec_context ctx;
2582 struct macsec_dev *macsec;
2583 int ret;
2584
2585 if (!attrs[MACSEC_ATTR_IFINDEX])
2586 return -EINVAL;
2587
2588 if (!attrs[MACSEC_ATTR_OFFLOAD])
2589 return -EINVAL;
2590
2591 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2592 attrs[MACSEC_ATTR_OFFLOAD],
2593 macsec_genl_offload_policy, NULL))
2594 return -EINVAL;
2595
2596 dev = get_dev_from_nl(genl_info_net(info), attrs);
2597 if (IS_ERR(dev))
2598 return PTR_ERR(dev);
2599 macsec = macsec_priv(dev);
2600
2601 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
2602 return -EINVAL;
2603
2604 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2605 if (macsec->offload == offload)
2606 return 0;
2607
2608 /* Check if the offloading mode is supported by the underlying layers */
2609 if (offload != MACSEC_OFFLOAD_OFF &&
2610 !macsec_check_offload(offload, macsec))
2611 return -EOPNOTSUPP;
2612
2613 /* Check if the net device is busy. */
2614 if (netif_running(dev))
2615 return -EBUSY;
2616
2617 rtnl_lock();
2618
2619 prev_offload = macsec->offload;
2620 macsec->offload = offload;
2621
2622 /* Check if the device already has rules configured: we do not support
2623 * rules migration.
2624 */
2625 if (macsec_is_configured(macsec)) {
2626 ret = -EBUSY;
2627 goto rollback;
2628 }
2629
2630 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2631 macsec, &ctx);
2632 if (!ops) {
2633 ret = -EOPNOTSUPP;
2634 goto rollback;
2635 }
2636
2637 if (prev_offload == MACSEC_OFFLOAD_OFF)
2638 func = ops->mdo_add_secy;
2639 else
2640 func = ops->mdo_del_secy;
2641
2642 ctx.secy = &macsec->secy;
2643 ret = macsec_offload(func, &ctx);
2644 if (ret)
2645 goto rollback;
2646
2647 /* Force features update, since they are different for SW MACSec and
2648 * HW offloading cases.
2649 */
2650 netdev_update_features(dev);
2651
2652 rtnl_unlock();
2653 return 0;
2654
2655rollback:
2656 macsec->offload = prev_offload;
2657
2658 rtnl_unlock();
2659 return ret;
2660}
2661
2662static void get_tx_sa_stats(struct net_device *dev, int an,
2663 struct macsec_tx_sa *tx_sa,
2664 struct macsec_tx_sa_stats *sum)
2665{
2666 struct macsec_dev *macsec = macsec_priv(dev);
2667 int cpu;
2668
2669 /* If h/w offloading is available, propagate to the device */
2670 if (macsec_is_offloaded(macsec)) {
2671 const struct macsec_ops *ops;
2672 struct macsec_context ctx;
2673
2674 ops = macsec_get_ops(macsec, &ctx);
2675 if (ops) {
2676 ctx.sa.assoc_num = an;
2677 ctx.sa.tx_sa = tx_sa;
2678 ctx.stats.tx_sa_stats = sum;
2679 ctx.secy = &macsec_priv(dev)->secy;
2680 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2681 }
2682 return;
2683 }
2684
2685 for_each_possible_cpu(cpu) {
2686 const struct macsec_tx_sa_stats *stats =
2687 per_cpu_ptr(tx_sa->stats, cpu);
2688
2689 sum->OutPktsProtected += stats->OutPktsProtected;
2690 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2691 }
2692}
2693
2694static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2695{
2696 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2697 sum->OutPktsProtected) ||
2698 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2699 sum->OutPktsEncrypted))
2700 return -EMSGSIZE;
2701
2702 return 0;
2703}
2704
2705static void get_rx_sa_stats(struct net_device *dev,
2706 struct macsec_rx_sc *rx_sc, int an,
2707 struct macsec_rx_sa *rx_sa,
2708 struct macsec_rx_sa_stats *sum)
2709{
2710 struct macsec_dev *macsec = macsec_priv(dev);
2711 int cpu;
2712
2713 /* If h/w offloading is available, propagate to the device */
2714 if (macsec_is_offloaded(macsec)) {
2715 const struct macsec_ops *ops;
2716 struct macsec_context ctx;
2717
2718 ops = macsec_get_ops(macsec, &ctx);
2719 if (ops) {
2720 ctx.sa.assoc_num = an;
2721 ctx.sa.rx_sa = rx_sa;
2722 ctx.stats.rx_sa_stats = sum;
2723 ctx.secy = &macsec_priv(dev)->secy;
2724 ctx.rx_sc = rx_sc;
2725 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2726 }
2727 return;
2728 }
2729
2730 for_each_possible_cpu(cpu) {
2731 const struct macsec_rx_sa_stats *stats =
2732 per_cpu_ptr(rx_sa->stats, cpu);
2733
2734 sum->InPktsOK += stats->InPktsOK;
2735 sum->InPktsInvalid += stats->InPktsInvalid;
2736 sum->InPktsNotValid += stats->InPktsNotValid;
2737 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2738 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2739 }
2740}
2741
2742static int copy_rx_sa_stats(struct sk_buff *skb,
2743 struct macsec_rx_sa_stats *sum)
2744{
2745 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2746 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2747 sum->InPktsInvalid) ||
2748 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2749 sum->InPktsNotValid) ||
2750 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2751 sum->InPktsNotUsingSA) ||
2752 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2753 sum->InPktsUnusedSA))
2754 return -EMSGSIZE;
2755
2756 return 0;
2757}
2758
2759static void get_rx_sc_stats(struct net_device *dev,
2760 struct macsec_rx_sc *rx_sc,
2761 struct macsec_rx_sc_stats *sum)
2762{
2763 struct macsec_dev *macsec = macsec_priv(dev);
2764 int cpu;
2765
2766 /* If h/w offloading is available, propagate to the device */
2767 if (macsec_is_offloaded(macsec)) {
2768 const struct macsec_ops *ops;
2769 struct macsec_context ctx;
2770
2771 ops = macsec_get_ops(macsec, &ctx);
2772 if (ops) {
2773 ctx.stats.rx_sc_stats = sum;
2774 ctx.secy = &macsec_priv(dev)->secy;
2775 ctx.rx_sc = rx_sc;
2776 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2777 }
2778 return;
2779 }
2780
2781 for_each_possible_cpu(cpu) {
2782 const struct pcpu_rx_sc_stats *stats;
2783 struct macsec_rx_sc_stats tmp;
2784 unsigned int start;
2785
2786 stats = per_cpu_ptr(rx_sc->stats, cpu);
2787 do {
2788 start = u64_stats_fetch_begin_irq(&stats->syncp);
2789 memcpy(&tmp, &stats->stats, sizeof(tmp));
2790 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2791
2792 sum->InOctetsValidated += tmp.InOctetsValidated;
2793 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2794 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2795 sum->InPktsDelayed += tmp.InPktsDelayed;
2796 sum->InPktsOK += tmp.InPktsOK;
2797 sum->InPktsInvalid += tmp.InPktsInvalid;
2798 sum->InPktsLate += tmp.InPktsLate;
2799 sum->InPktsNotValid += tmp.InPktsNotValid;
2800 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2801 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2802 }
2803}
2804
2805static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2806{
2807 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2808 sum->InOctetsValidated,
2809 MACSEC_RXSC_STATS_ATTR_PAD) ||
2810 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2811 sum->InOctetsDecrypted,
2812 MACSEC_RXSC_STATS_ATTR_PAD) ||
2813 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2814 sum->InPktsUnchecked,
2815 MACSEC_RXSC_STATS_ATTR_PAD) ||
2816 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2817 sum->InPktsDelayed,
2818 MACSEC_RXSC_STATS_ATTR_PAD) ||
2819 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2820 sum->InPktsOK,
2821 MACSEC_RXSC_STATS_ATTR_PAD) ||
2822 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2823 sum->InPktsInvalid,
2824 MACSEC_RXSC_STATS_ATTR_PAD) ||
2825 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2826 sum->InPktsLate,
2827 MACSEC_RXSC_STATS_ATTR_PAD) ||
2828 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2829 sum->InPktsNotValid,
2830 MACSEC_RXSC_STATS_ATTR_PAD) ||
2831 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2832 sum->InPktsNotUsingSA,
2833 MACSEC_RXSC_STATS_ATTR_PAD) ||
2834 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2835 sum->InPktsUnusedSA,
2836 MACSEC_RXSC_STATS_ATTR_PAD))
2837 return -EMSGSIZE;
2838
2839 return 0;
2840}
2841
2842static void get_tx_sc_stats(struct net_device *dev,
2843 struct macsec_tx_sc_stats *sum)
2844{
2845 struct macsec_dev *macsec = macsec_priv(dev);
2846 int cpu;
2847
2848 /* If h/w offloading is available, propagate to the device */
2849 if (macsec_is_offloaded(macsec)) {
2850 const struct macsec_ops *ops;
2851 struct macsec_context ctx;
2852
2853 ops = macsec_get_ops(macsec, &ctx);
2854 if (ops) {
2855 ctx.stats.tx_sc_stats = sum;
2856 ctx.secy = &macsec_priv(dev)->secy;
2857 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2858 }
2859 return;
2860 }
2861
2862 for_each_possible_cpu(cpu) {
2863 const struct pcpu_tx_sc_stats *stats;
2864 struct macsec_tx_sc_stats tmp;
2865 unsigned int start;
2866
2867 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2868 do {
2869 start = u64_stats_fetch_begin_irq(&stats->syncp);
2870 memcpy(&tmp, &stats->stats, sizeof(tmp));
2871 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2872
2873 sum->OutPktsProtected += tmp.OutPktsProtected;
2874 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2875 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2876 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2877 }
2878}
2879
2880static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2881{
2882 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2883 sum->OutPktsProtected,
2884 MACSEC_TXSC_STATS_ATTR_PAD) ||
2885 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2886 sum->OutPktsEncrypted,
2887 MACSEC_TXSC_STATS_ATTR_PAD) ||
2888 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2889 sum->OutOctetsProtected,
2890 MACSEC_TXSC_STATS_ATTR_PAD) ||
2891 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2892 sum->OutOctetsEncrypted,
2893 MACSEC_TXSC_STATS_ATTR_PAD))
2894 return -EMSGSIZE;
2895
2896 return 0;
2897}
2898
2899static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2900{
2901 struct macsec_dev *macsec = macsec_priv(dev);
2902 int cpu;
2903
2904 /* If h/w offloading is available, propagate to the device */
2905 if (macsec_is_offloaded(macsec)) {
2906 const struct macsec_ops *ops;
2907 struct macsec_context ctx;
2908
2909 ops = macsec_get_ops(macsec, &ctx);
2910 if (ops) {
2911 ctx.stats.dev_stats = sum;
2912 ctx.secy = &macsec_priv(dev)->secy;
2913 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2914 }
2915 return;
2916 }
2917
2918 for_each_possible_cpu(cpu) {
2919 const struct pcpu_secy_stats *stats;
2920 struct macsec_dev_stats tmp;
2921 unsigned int start;
2922
2923 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2924 do {
2925 start = u64_stats_fetch_begin_irq(&stats->syncp);
2926 memcpy(&tmp, &stats->stats, sizeof(tmp));
2927 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2928
2929 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2930 sum->InPktsUntagged += tmp.InPktsUntagged;
2931 sum->OutPktsTooLong += tmp.OutPktsTooLong;
2932 sum->InPktsNoTag += tmp.InPktsNoTag;
2933 sum->InPktsBadTag += tmp.InPktsBadTag;
2934 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2935 sum->InPktsNoSCI += tmp.InPktsNoSCI;
2936 sum->InPktsOverrun += tmp.InPktsOverrun;
2937 }
2938}
2939
2940static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
2941{
2942 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2943 sum->OutPktsUntagged,
2944 MACSEC_SECY_STATS_ATTR_PAD) ||
2945 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2946 sum->InPktsUntagged,
2947 MACSEC_SECY_STATS_ATTR_PAD) ||
2948 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2949 sum->OutPktsTooLong,
2950 MACSEC_SECY_STATS_ATTR_PAD) ||
2951 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2952 sum->InPktsNoTag,
2953 MACSEC_SECY_STATS_ATTR_PAD) ||
2954 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2955 sum->InPktsBadTag,
2956 MACSEC_SECY_STATS_ATTR_PAD) ||
2957 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2958 sum->InPktsUnknownSCI,
2959 MACSEC_SECY_STATS_ATTR_PAD) ||
2960 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2961 sum->InPktsNoSCI,
2962 MACSEC_SECY_STATS_ATTR_PAD) ||
2963 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2964 sum->InPktsOverrun,
2965 MACSEC_SECY_STATS_ATTR_PAD))
2966 return -EMSGSIZE;
2967
2968 return 0;
2969}
2970
2971static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2972{
2973 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2974 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2975 MACSEC_ATTR_SECY);
2976 u64 csid;
2977
2978 if (!secy_nest)
2979 return 1;
2980
2981 switch (secy->key_len) {
2982 case MACSEC_GCM_AES_128_SAK_LEN:
2983 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
2984 break;
2985 case MACSEC_GCM_AES_256_SAK_LEN:
2986 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
2987 break;
2988 default:
2989 goto cancel;
2990 }
2991
2992 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2993 MACSEC_SECY_ATTR_PAD) ||
2994 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2995 csid, MACSEC_SECY_ATTR_PAD) ||
2996 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2997 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2998 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2999 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3000 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3001 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3002 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3003 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3004 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3005 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3006 goto cancel;
3007
3008 if (secy->replay_protect) {
3009 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3010 goto cancel;
3011 }
3012
3013 nla_nest_end(skb, secy_nest);
3014 return 0;
3015
3016cancel:
3017 nla_nest_cancel(skb, secy_nest);
3018 return 1;
3019}
3020
3021static noinline_for_stack int
3022dump_secy(struct macsec_secy *secy, struct net_device *dev,
3023 struct sk_buff *skb, struct netlink_callback *cb)
3024{
3025 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3026 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3027 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3028 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3029 struct macsec_dev *macsec = netdev_priv(dev);
3030 struct macsec_dev_stats dev_stats = {0, };
3031 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3032 struct nlattr *txsa_list, *rxsc_list;
3033 struct macsec_rx_sc *rx_sc;
3034 struct nlattr *attr;
3035 void *hdr;
3036 int i, j;
3037
3038 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3039 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3040 if (!hdr)
3041 return -EMSGSIZE;
3042
3043 genl_dump_check_consistent(cb, hdr);
3044
3045 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3046 goto nla_put_failure;
3047
3048 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3049 if (!attr)
3050 goto nla_put_failure;
3051 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3052 goto nla_put_failure;
3053 nla_nest_end(skb, attr);
3054
3055 if (nla_put_secy(secy, skb))
3056 goto nla_put_failure;
3057
3058 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3059 if (!attr)
3060 goto nla_put_failure;
3061
3062 get_tx_sc_stats(dev, &tx_sc_stats);
3063 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3064 nla_nest_cancel(skb, attr);
3065 goto nla_put_failure;
3066 }
3067 nla_nest_end(skb, attr);
3068
3069 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3070 if (!attr)
3071 goto nla_put_failure;
3072 get_secy_stats(dev, &dev_stats);
3073 if (copy_secy_stats(skb, &dev_stats)) {
3074 nla_nest_cancel(skb, attr);
3075 goto nla_put_failure;
3076 }
3077 nla_nest_end(skb, attr);
3078
3079 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3080 if (!txsa_list)
3081 goto nla_put_failure;
3082 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3083 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3084 struct nlattr *txsa_nest;
3085 u64 pn;
3086 int pn_len;
3087
3088 if (!tx_sa)
3089 continue;
3090
3091 txsa_nest = nla_nest_start_noflag(skb, j++);
3092 if (!txsa_nest) {
3093 nla_nest_cancel(skb, txsa_list);
3094 goto nla_put_failure;
3095 }
3096
3097 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3098 if (!attr) {
3099 nla_nest_cancel(skb, txsa_nest);
3100 nla_nest_cancel(skb, txsa_list);
3101 goto nla_put_failure;
3102 }
3103 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3104 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3105 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3106 nla_nest_cancel(skb, attr);
3107 nla_nest_cancel(skb, txsa_nest);
3108 nla_nest_cancel(skb, txsa_list);
3109 goto nla_put_failure;
3110 }
3111 nla_nest_end(skb, attr);
3112
3113 if (secy->xpn) {
3114 pn = tx_sa->next_pn;
3115 pn_len = MACSEC_XPN_PN_LEN;
3116 } else {
3117 pn = tx_sa->next_pn_halves.lower;
3118 pn_len = MACSEC_DEFAULT_PN_LEN;
3119 }
3120
3121 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3122 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3123 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3124 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3125 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3126 nla_nest_cancel(skb, txsa_nest);
3127 nla_nest_cancel(skb, txsa_list);
3128 goto nla_put_failure;
3129 }
3130
3131 nla_nest_end(skb, txsa_nest);
3132 }
3133 nla_nest_end(skb, txsa_list);
3134
3135 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3136 if (!rxsc_list)
3137 goto nla_put_failure;
3138
3139 j = 1;
3140 for_each_rxsc_rtnl(secy, rx_sc) {
3141 int k;
3142 struct nlattr *rxsa_list;
3143 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3144
3145 if (!rxsc_nest) {
3146 nla_nest_cancel(skb, rxsc_list);
3147 goto nla_put_failure;
3148 }
3149
3150 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3151 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3152 MACSEC_RXSC_ATTR_PAD)) {
3153 nla_nest_cancel(skb, rxsc_nest);
3154 nla_nest_cancel(skb, rxsc_list);
3155 goto nla_put_failure;
3156 }
3157
3158 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3159 if (!attr) {
3160 nla_nest_cancel(skb, rxsc_nest);
3161 nla_nest_cancel(skb, rxsc_list);
3162 goto nla_put_failure;
3163 }
3164 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3165 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3166 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3167 nla_nest_cancel(skb, attr);
3168 nla_nest_cancel(skb, rxsc_nest);
3169 nla_nest_cancel(skb, rxsc_list);
3170 goto nla_put_failure;
3171 }
3172 nla_nest_end(skb, attr);
3173
3174 rxsa_list = nla_nest_start_noflag(skb,
3175 MACSEC_RXSC_ATTR_SA_LIST);
3176 if (!rxsa_list) {
3177 nla_nest_cancel(skb, rxsc_nest);
3178 nla_nest_cancel(skb, rxsc_list);
3179 goto nla_put_failure;
3180 }
3181
3182 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3183 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3184 struct nlattr *rxsa_nest;
3185 u64 pn;
3186 int pn_len;
3187
3188 if (!rx_sa)
3189 continue;
3190
3191 rxsa_nest = nla_nest_start_noflag(skb, k++);
3192 if (!rxsa_nest) {
3193 nla_nest_cancel(skb, rxsa_list);
3194 nla_nest_cancel(skb, rxsc_nest);
3195 nla_nest_cancel(skb, rxsc_list);
3196 goto nla_put_failure;
3197 }
3198
3199 attr = nla_nest_start_noflag(skb,
3200 MACSEC_SA_ATTR_STATS);
3201 if (!attr) {
3202 nla_nest_cancel(skb, rxsa_list);
3203 nla_nest_cancel(skb, rxsc_nest);
3204 nla_nest_cancel(skb, rxsc_list);
3205 goto nla_put_failure;
3206 }
3207 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3208 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3209 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3210 nla_nest_cancel(skb, attr);
3211 nla_nest_cancel(skb, rxsa_list);
3212 nla_nest_cancel(skb, rxsc_nest);
3213 nla_nest_cancel(skb, rxsc_list);
3214 goto nla_put_failure;
3215 }
3216 nla_nest_end(skb, attr);
3217
3218 if (secy->xpn) {
3219 pn = rx_sa->next_pn;
3220 pn_len = MACSEC_XPN_PN_LEN;
3221 } else {
3222 pn = rx_sa->next_pn_halves.lower;
3223 pn_len = MACSEC_DEFAULT_PN_LEN;
3224 }
3225
3226 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3227 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3228 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3229 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3230 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3231 nla_nest_cancel(skb, rxsa_nest);
3232 nla_nest_cancel(skb, rxsc_nest);
3233 nla_nest_cancel(skb, rxsc_list);
3234 goto nla_put_failure;
3235 }
3236 nla_nest_end(skb, rxsa_nest);
3237 }
3238
3239 nla_nest_end(skb, rxsa_list);
3240 nla_nest_end(skb, rxsc_nest);
3241 }
3242
3243 nla_nest_end(skb, rxsc_list);
3244
3245 genlmsg_end(skb, hdr);
3246
3247 return 0;
3248
3249nla_put_failure:
3250 genlmsg_cancel(skb, hdr);
3251 return -EMSGSIZE;
3252}
3253
3254static int macsec_generation = 1; /* protected by RTNL */
3255
3256static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3257{
3258 struct net *net = sock_net(skb->sk);
3259 struct net_device *dev;
3260 int dev_idx, d;
3261
3262 dev_idx = cb->args[0];
3263
3264 d = 0;
3265 rtnl_lock();
3266
3267 cb->seq = macsec_generation;
3268
3269 for_each_netdev(net, dev) {
3270 struct macsec_secy *secy;
3271
3272 if (d < dev_idx)
3273 goto next;
3274
3275 if (!netif_is_macsec(dev))
3276 goto next;
3277
3278 secy = &macsec_priv(dev)->secy;
3279 if (dump_secy(secy, dev, skb, cb) < 0)
3280 goto done;
3281next:
3282 d++;
3283 }
3284
3285done:
3286 rtnl_unlock();
3287 cb->args[0] = d;
3288 return skb->len;
3289}
3290
3291static const struct genl_small_ops macsec_genl_ops[] = {
3292 {
3293 .cmd = MACSEC_CMD_GET_TXSC,
3294 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3295 .dumpit = macsec_dump_txsc,
3296 },
3297 {
3298 .cmd = MACSEC_CMD_ADD_RXSC,
3299 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3300 .doit = macsec_add_rxsc,
3301 .flags = GENL_ADMIN_PERM,
3302 },
3303 {
3304 .cmd = MACSEC_CMD_DEL_RXSC,
3305 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3306 .doit = macsec_del_rxsc,
3307 .flags = GENL_ADMIN_PERM,
3308 },
3309 {
3310 .cmd = MACSEC_CMD_UPD_RXSC,
3311 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3312 .doit = macsec_upd_rxsc,
3313 .flags = GENL_ADMIN_PERM,
3314 },
3315 {
3316 .cmd = MACSEC_CMD_ADD_TXSA,
3317 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3318 .doit = macsec_add_txsa,
3319 .flags = GENL_ADMIN_PERM,
3320 },
3321 {
3322 .cmd = MACSEC_CMD_DEL_TXSA,
3323 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3324 .doit = macsec_del_txsa,
3325 .flags = GENL_ADMIN_PERM,
3326 },
3327 {
3328 .cmd = MACSEC_CMD_UPD_TXSA,
3329 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3330 .doit = macsec_upd_txsa,
3331 .flags = GENL_ADMIN_PERM,
3332 },
3333 {
3334 .cmd = MACSEC_CMD_ADD_RXSA,
3335 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3336 .doit = macsec_add_rxsa,
3337 .flags = GENL_ADMIN_PERM,
3338 },
3339 {
3340 .cmd = MACSEC_CMD_DEL_RXSA,
3341 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3342 .doit = macsec_del_rxsa,
3343 .flags = GENL_ADMIN_PERM,
3344 },
3345 {
3346 .cmd = MACSEC_CMD_UPD_RXSA,
3347 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3348 .doit = macsec_upd_rxsa,
3349 .flags = GENL_ADMIN_PERM,
3350 },
3351 {
3352 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3353 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3354 .doit = macsec_upd_offload,
3355 .flags = GENL_ADMIN_PERM,
3356 },
3357};
3358
3359static struct genl_family macsec_fam __ro_after_init = {
3360 .name = MACSEC_GENL_NAME,
3361 .hdrsize = 0,
3362 .version = MACSEC_GENL_VERSION,
3363 .maxattr = MACSEC_ATTR_MAX,
3364 .policy = macsec_genl_policy,
3365 .netnsok = true,
3366 .module = THIS_MODULE,
3367 .small_ops = macsec_genl_ops,
3368 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3369};
3370
3371static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3372 struct net_device *dev)
3373{
3374 struct macsec_dev *macsec = netdev_priv(dev);
3375 struct macsec_secy *secy = &macsec->secy;
3376 struct pcpu_secy_stats *secy_stats;
3377 int ret, len;
3378
3379 if (macsec_is_offloaded(netdev_priv(dev))) {
3380 skb->dev = macsec->real_dev;
3381 return dev_queue_xmit(skb);
3382 }
3383
3384 /* 10.5 */
3385 if (!secy->protect_frames) {
3386 secy_stats = this_cpu_ptr(macsec->stats);
3387 u64_stats_update_begin(&secy_stats->syncp);
3388 secy_stats->stats.OutPktsUntagged++;
3389 u64_stats_update_end(&secy_stats->syncp);
3390 skb->dev = macsec->real_dev;
3391 len = skb->len;
3392 ret = dev_queue_xmit(skb);
3393 count_tx(dev, ret, len);
3394 return ret;
3395 }
3396
3397 if (!secy->operational) {
3398 kfree_skb(skb);
3399 dev->stats.tx_dropped++;
3400 return NETDEV_TX_OK;
3401 }
3402
3403 skb = macsec_encrypt(skb, dev);
3404 if (IS_ERR(skb)) {
3405 if (PTR_ERR(skb) != -EINPROGRESS)
3406 dev->stats.tx_dropped++;
3407 return NETDEV_TX_OK;
3408 }
3409
3410 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3411
3412 macsec_encrypt_finish(skb, dev);
3413 len = skb->len;
3414 ret = dev_queue_xmit(skb);
3415 count_tx(dev, ret, len);
3416 return ret;
3417}
3418
3419#define SW_MACSEC_FEATURES \
3420 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3421
3422/* If h/w offloading is enabled, use real device features save for
3423 * VLAN_FEATURES - they require additional ops
3424 * HW_MACSEC - no reason to report it
3425 */
3426#define REAL_DEV_FEATURES(dev) \
3427 ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC))
3428
3429static int macsec_dev_init(struct net_device *dev)
3430{
3431 struct macsec_dev *macsec = macsec_priv(dev);
3432 struct net_device *real_dev = macsec->real_dev;
3433 int err;
3434
3435 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3436 if (!dev->tstats)
3437 return -ENOMEM;
3438
3439 err = gro_cells_init(&macsec->gro_cells, dev);
3440 if (err) {
3441 free_percpu(dev->tstats);
3442 return err;
3443 }
3444
3445 if (macsec_is_offloaded(macsec)) {
3446 dev->features = REAL_DEV_FEATURES(real_dev);
3447 } else {
3448 dev->features = real_dev->features & SW_MACSEC_FEATURES;
3449 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3450 }
3451
3452 dev->needed_headroom = real_dev->needed_headroom +
3453 MACSEC_NEEDED_HEADROOM;
3454 dev->needed_tailroom = real_dev->needed_tailroom +
3455 MACSEC_NEEDED_TAILROOM;
3456
3457 if (is_zero_ether_addr(dev->dev_addr))
3458 eth_hw_addr_inherit(dev, real_dev);
3459 if (is_zero_ether_addr(dev->broadcast))
3460 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3461
3462 return 0;
3463}
3464
3465static void macsec_dev_uninit(struct net_device *dev)
3466{
3467 struct macsec_dev *macsec = macsec_priv(dev);
3468
3469 gro_cells_destroy(&macsec->gro_cells);
3470 free_percpu(dev->tstats);
3471}
3472
3473static netdev_features_t macsec_fix_features(struct net_device *dev,
3474 netdev_features_t features)
3475{
3476 struct macsec_dev *macsec = macsec_priv(dev);
3477 struct net_device *real_dev = macsec->real_dev;
3478
3479 if (macsec_is_offloaded(macsec))
3480 return REAL_DEV_FEATURES(real_dev);
3481
3482 features &= (real_dev->features & SW_MACSEC_FEATURES) |
3483 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3484 features |= NETIF_F_LLTX;
3485
3486 return features;
3487}
3488
3489static int macsec_dev_open(struct net_device *dev)
3490{
3491 struct macsec_dev *macsec = macsec_priv(dev);
3492 struct net_device *real_dev = macsec->real_dev;
3493 int err;
3494
3495 err = dev_uc_add(real_dev, dev->dev_addr);
3496 if (err < 0)
3497 return err;
3498
3499 if (dev->flags & IFF_ALLMULTI) {
3500 err = dev_set_allmulti(real_dev, 1);
3501 if (err < 0)
3502 goto del_unicast;
3503 }
3504
3505 if (dev->flags & IFF_PROMISC) {
3506 err = dev_set_promiscuity(real_dev, 1);
3507 if (err < 0)
3508 goto clear_allmulti;
3509 }
3510
3511 /* If h/w offloading is available, propagate to the device */
3512 if (macsec_is_offloaded(macsec)) {
3513 const struct macsec_ops *ops;
3514 struct macsec_context ctx;
3515
3516 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3517 if (!ops) {
3518 err = -EOPNOTSUPP;
3519 goto clear_allmulti;
3520 }
3521
3522 ctx.secy = &macsec->secy;
3523 err = macsec_offload(ops->mdo_dev_open, &ctx);
3524 if (err)
3525 goto clear_allmulti;
3526 }
3527
3528 if (netif_carrier_ok(real_dev))
3529 netif_carrier_on(dev);
3530
3531 return 0;
3532clear_allmulti:
3533 if (dev->flags & IFF_ALLMULTI)
3534 dev_set_allmulti(real_dev, -1);
3535del_unicast:
3536 dev_uc_del(real_dev, dev->dev_addr);
3537 netif_carrier_off(dev);
3538 return err;
3539}
3540
3541static int macsec_dev_stop(struct net_device *dev)
3542{
3543 struct macsec_dev *macsec = macsec_priv(dev);
3544 struct net_device *real_dev = macsec->real_dev;
3545
3546 netif_carrier_off(dev);
3547
3548 /* If h/w offloading is available, propagate to the device */
3549 if (macsec_is_offloaded(macsec)) {
3550 const struct macsec_ops *ops;
3551 struct macsec_context ctx;
3552
3553 ops = macsec_get_ops(macsec, &ctx);
3554 if (ops) {
3555 ctx.secy = &macsec->secy;
3556 macsec_offload(ops->mdo_dev_stop, &ctx);
3557 }
3558 }
3559
3560 dev_mc_unsync(real_dev, dev);
3561 dev_uc_unsync(real_dev, dev);
3562
3563 if (dev->flags & IFF_ALLMULTI)
3564 dev_set_allmulti(real_dev, -1);
3565
3566 if (dev->flags & IFF_PROMISC)
3567 dev_set_promiscuity(real_dev, -1);
3568
3569 dev_uc_del(real_dev, dev->dev_addr);
3570
3571 return 0;
3572}
3573
3574static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3575{
3576 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3577
3578 if (!(dev->flags & IFF_UP))
3579 return;
3580
3581 if (change & IFF_ALLMULTI)
3582 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3583
3584 if (change & IFF_PROMISC)
3585 dev_set_promiscuity(real_dev,
3586 dev->flags & IFF_PROMISC ? 1 : -1);
3587}
3588
3589static void macsec_dev_set_rx_mode(struct net_device *dev)
3590{
3591 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3592
3593 dev_mc_sync(real_dev, dev);
3594 dev_uc_sync(real_dev, dev);
3595}
3596
3597static int macsec_set_mac_address(struct net_device *dev, void *p)
3598{
3599 struct macsec_dev *macsec = macsec_priv(dev);
3600 struct net_device *real_dev = macsec->real_dev;
3601 struct sockaddr *addr = p;
3602 int err;
3603
3604 if (!is_valid_ether_addr(addr->sa_data))
3605 return -EADDRNOTAVAIL;
3606
3607 if (!(dev->flags & IFF_UP))
3608 goto out;
3609
3610 err = dev_uc_add(real_dev, addr->sa_data);
3611 if (err < 0)
3612 return err;
3613
3614 dev_uc_del(real_dev, dev->dev_addr);
3615
3616out:
3617 ether_addr_copy(dev->dev_addr, addr->sa_data);
3618 macsec->secy.sci = dev_to_sci(dev, MACSEC_PORT_ES);
3619
3620 /* If h/w offloading is available, propagate to the device */
3621 if (macsec_is_offloaded(macsec)) {
3622 const struct macsec_ops *ops;
3623 struct macsec_context ctx;
3624
3625 ops = macsec_get_ops(macsec, &ctx);
3626 if (ops) {
3627 ctx.secy = &macsec->secy;
3628 macsec_offload(ops->mdo_upd_secy, &ctx);
3629 }
3630 }
3631
3632 return 0;
3633}
3634
3635static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3636{
3637 struct macsec_dev *macsec = macsec_priv(dev);
3638 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3639
3640 if (macsec->real_dev->mtu - extra < new_mtu)
3641 return -ERANGE;
3642
3643 dev->mtu = new_mtu;
3644
3645 return 0;
3646}
3647
3648static void macsec_get_stats64(struct net_device *dev,
3649 struct rtnl_link_stats64 *s)
3650{
3651 if (!dev->tstats)
3652 return;
3653
3654 dev_fetch_sw_netstats(s, dev->tstats);
3655
3656 s->rx_dropped = dev->stats.rx_dropped;
3657 s->tx_dropped = dev->stats.tx_dropped;
3658}
3659
3660static int macsec_get_iflink(const struct net_device *dev)
3661{
3662 return macsec_priv(dev)->real_dev->ifindex;
3663}
3664
3665static const struct net_device_ops macsec_netdev_ops = {
3666 .ndo_init = macsec_dev_init,
3667 .ndo_uninit = macsec_dev_uninit,
3668 .ndo_open = macsec_dev_open,
3669 .ndo_stop = macsec_dev_stop,
3670 .ndo_fix_features = macsec_fix_features,
3671 .ndo_change_mtu = macsec_change_mtu,
3672 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3673 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3674 .ndo_set_mac_address = macsec_set_mac_address,
3675 .ndo_start_xmit = macsec_start_xmit,
3676 .ndo_get_stats64 = macsec_get_stats64,
3677 .ndo_get_iflink = macsec_get_iflink,
3678};
3679
3680static const struct device_type macsec_type = {
3681 .name = "macsec",
3682};
3683
3684static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3685 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3686 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3687 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3688 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3689 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3690 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3691 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3692 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3693 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3694 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3695 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3696 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3697 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3698};
3699
3700static void macsec_free_netdev(struct net_device *dev)
3701{
3702 struct macsec_dev *macsec = macsec_priv(dev);
3703
3704 free_percpu(macsec->stats);
3705 free_percpu(macsec->secy.tx_sc.stats);
3706
3707}
3708
3709static void macsec_setup(struct net_device *dev)
3710{
3711 ether_setup(dev);
3712 dev->min_mtu = 0;
3713 dev->max_mtu = ETH_MAX_MTU;
3714 dev->priv_flags |= IFF_NO_QUEUE;
3715 dev->netdev_ops = &macsec_netdev_ops;
3716 dev->needs_free_netdev = true;
3717 dev->priv_destructor = macsec_free_netdev;
3718 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3719
3720 eth_zero_addr(dev->broadcast);
3721}
3722
3723static int macsec_changelink_common(struct net_device *dev,
3724 struct nlattr *data[])
3725{
3726 struct macsec_secy *secy;
3727 struct macsec_tx_sc *tx_sc;
3728
3729 secy = &macsec_priv(dev)->secy;
3730 tx_sc = &secy->tx_sc;
3731
3732 if (data[IFLA_MACSEC_ENCODING_SA]) {
3733 struct macsec_tx_sa *tx_sa;
3734
3735 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3736 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3737
3738 secy->operational = tx_sa && tx_sa->active;
3739 }
3740
3741 if (data[IFLA_MACSEC_WINDOW])
3742 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3743
3744 if (data[IFLA_MACSEC_ENCRYPT])
3745 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3746
3747 if (data[IFLA_MACSEC_PROTECT])
3748 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3749
3750 if (data[IFLA_MACSEC_INC_SCI])
3751 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3752
3753 if (data[IFLA_MACSEC_ES])
3754 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3755
3756 if (data[IFLA_MACSEC_SCB])
3757 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3758
3759 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3760 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3761
3762 if (data[IFLA_MACSEC_VALIDATION])
3763 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3764
3765 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3766 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3767 case MACSEC_CIPHER_ID_GCM_AES_128:
3768 case MACSEC_DEFAULT_CIPHER_ID:
3769 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3770 secy->xpn = false;
3771 break;
3772 case MACSEC_CIPHER_ID_GCM_AES_256:
3773 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3774 secy->xpn = false;
3775 break;
3776 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3777 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3778 secy->xpn = true;
3779 break;
3780 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3781 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3782 secy->xpn = true;
3783 break;
3784 default:
3785 return -EINVAL;
3786 }
3787 }
3788
3789 return 0;
3790}
3791
3792static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3793 struct nlattr *data[],
3794 struct netlink_ext_ack *extack)
3795{
3796 struct macsec_dev *macsec = macsec_priv(dev);
3797 struct macsec_tx_sc tx_sc;
3798 struct macsec_secy secy;
3799 int ret;
3800
3801 if (!data)
3802 return 0;
3803
3804 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3805 data[IFLA_MACSEC_ICV_LEN] ||
3806 data[IFLA_MACSEC_SCI] ||
3807 data[IFLA_MACSEC_PORT])
3808 return -EINVAL;
3809
3810 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3811 * propagation fails, to revert macsec_changelink_common.
3812 */
3813 memcpy(&secy, &macsec->secy, sizeof(secy));
3814 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3815
3816 ret = macsec_changelink_common(dev, data);
3817 if (ret)
3818 return ret;
3819
3820 /* If h/w offloading is available, propagate to the device */
3821 if (macsec_is_offloaded(macsec)) {
3822 const struct macsec_ops *ops;
3823 struct macsec_context ctx;
3824 int ret;
3825
3826 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3827 if (!ops) {
3828 ret = -EOPNOTSUPP;
3829 goto cleanup;
3830 }
3831
3832 ctx.secy = &macsec->secy;
3833 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3834 if (ret)
3835 goto cleanup;
3836 }
3837
3838 return 0;
3839
3840cleanup:
3841 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3842 memcpy(&macsec->secy, &secy, sizeof(secy));
3843
3844 return ret;
3845}
3846
3847static void macsec_del_dev(struct macsec_dev *macsec)
3848{
3849 int i;
3850
3851 while (macsec->secy.rx_sc) {
3852 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3853
3854 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3855 free_rx_sc(rx_sc);
3856 }
3857
3858 for (i = 0; i < MACSEC_NUM_AN; i++) {
3859 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3860
3861 if (sa) {
3862 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3863 clear_tx_sa(sa);
3864 }
3865 }
3866}
3867
3868static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3869{
3870 struct macsec_dev *macsec = macsec_priv(dev);
3871 struct net_device *real_dev = macsec->real_dev;
3872
3873 unregister_netdevice_queue(dev, head);
3874 list_del_rcu(&macsec->secys);
3875 macsec_del_dev(macsec);
3876 netdev_upper_dev_unlink(real_dev, dev);
3877
3878 macsec_generation++;
3879}
3880
3881static void macsec_dellink(struct net_device *dev, struct list_head *head)
3882{
3883 struct macsec_dev *macsec = macsec_priv(dev);
3884 struct net_device *real_dev = macsec->real_dev;
3885 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3886
3887 /* If h/w offloading is available, propagate to the device */
3888 if (macsec_is_offloaded(macsec)) {
3889 const struct macsec_ops *ops;
3890 struct macsec_context ctx;
3891
3892 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3893 if (ops) {
3894 ctx.secy = &macsec->secy;
3895 macsec_offload(ops->mdo_del_secy, &ctx);
3896 }
3897 }
3898
3899 macsec_common_dellink(dev, head);
3900
3901 if (list_empty(&rxd->secys)) {
3902 netdev_rx_handler_unregister(real_dev);
3903 kfree(rxd);
3904 }
3905}
3906
3907static int register_macsec_dev(struct net_device *real_dev,
3908 struct net_device *dev)
3909{
3910 struct macsec_dev *macsec = macsec_priv(dev);
3911 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3912
3913 if (!rxd) {
3914 int err;
3915
3916 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3917 if (!rxd)
3918 return -ENOMEM;
3919
3920 INIT_LIST_HEAD(&rxd->secys);
3921
3922 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3923 rxd);
3924 if (err < 0) {
3925 kfree(rxd);
3926 return err;
3927 }
3928 }
3929
3930 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3931 return 0;
3932}
3933
3934static bool sci_exists(struct net_device *dev, sci_t sci)
3935{
3936 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3937 struct macsec_dev *macsec;
3938
3939 list_for_each_entry(macsec, &rxd->secys, secys) {
3940 if (macsec->secy.sci == sci)
3941 return true;
3942 }
3943
3944 return false;
3945}
3946
3947static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3948{
3949 struct macsec_dev *macsec = macsec_priv(dev);
3950 struct macsec_secy *secy = &macsec->secy;
3951
3952 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3953 if (!macsec->stats)
3954 return -ENOMEM;
3955
3956 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3957 if (!secy->tx_sc.stats) {
3958 free_percpu(macsec->stats);
3959 return -ENOMEM;
3960 }
3961
3962 if (sci == MACSEC_UNDEF_SCI)
3963 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3964
3965 secy->netdev = dev;
3966 secy->operational = true;
3967 secy->key_len = DEFAULT_SAK_LEN;
3968 secy->icv_len = icv_len;
3969 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3970 secy->protect_frames = true;
3971 secy->replay_protect = false;
3972 secy->xpn = DEFAULT_XPN;
3973
3974 secy->sci = sci;
3975 secy->tx_sc.active = true;
3976 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3977 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3978 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3979 secy->tx_sc.end_station = false;
3980 secy->tx_sc.scb = false;
3981
3982 return 0;
3983}
3984
3985static struct lock_class_key macsec_netdev_addr_lock_key;
3986
3987static int macsec_newlink(struct net *net, struct net_device *dev,
3988 struct nlattr *tb[], struct nlattr *data[],
3989 struct netlink_ext_ack *extack)
3990{
3991 struct macsec_dev *macsec = macsec_priv(dev);
3992 rx_handler_func_t *rx_handler;
3993 u8 icv_len = DEFAULT_ICV_LEN;
3994 struct net_device *real_dev;
3995 int err, mtu;
3996 sci_t sci;
3997
3998 if (!tb[IFLA_LINK])
3999 return -EINVAL;
4000 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4001 if (!real_dev)
4002 return -ENODEV;
4003 if (real_dev->type != ARPHRD_ETHER)
4004 return -EINVAL;
4005
4006 dev->priv_flags |= IFF_MACSEC;
4007
4008 macsec->real_dev = real_dev;
4009
4010 if (data && data[IFLA_MACSEC_OFFLOAD])
4011 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4012 else
4013 /* MACsec offloading is off by default */
4014 macsec->offload = MACSEC_OFFLOAD_OFF;
4015
4016 /* Check if the offloading mode is supported by the underlying layers */
4017 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4018 !macsec_check_offload(macsec->offload, macsec))
4019 return -EOPNOTSUPP;
4020
4021 if (data && data[IFLA_MACSEC_ICV_LEN])
4022 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4023 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4024 if (mtu < 0)
4025 dev->mtu = 0;
4026 else
4027 dev->mtu = mtu;
4028
4029 rx_handler = rtnl_dereference(real_dev->rx_handler);
4030 if (rx_handler && rx_handler != macsec_handle_frame)
4031 return -EBUSY;
4032
4033 err = register_netdevice(dev);
4034 if (err < 0)
4035 return err;
4036
4037 netdev_lockdep_set_classes(dev);
4038 lockdep_set_class(&dev->addr_list_lock,
4039 &macsec_netdev_addr_lock_key);
4040
4041 err = netdev_upper_dev_link(real_dev, dev, extack);
4042 if (err < 0)
4043 goto unregister;
4044
4045 /* need to be already registered so that ->init has run and
4046 * the MAC addr is set
4047 */
4048 if (data && data[IFLA_MACSEC_SCI])
4049 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4050 else if (data && data[IFLA_MACSEC_PORT])
4051 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4052 else
4053 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4054
4055 if (rx_handler && sci_exists(real_dev, sci)) {
4056 err = -EBUSY;
4057 goto unlink;
4058 }
4059
4060 err = macsec_add_dev(dev, sci, icv_len);
4061 if (err)
4062 goto unlink;
4063
4064 if (data) {
4065 err = macsec_changelink_common(dev, data);
4066 if (err)
4067 goto del_dev;
4068 }
4069
4070 /* If h/w offloading is available, propagate to the device */
4071 if (macsec_is_offloaded(macsec)) {
4072 const struct macsec_ops *ops;
4073 struct macsec_context ctx;
4074
4075 ops = macsec_get_ops(macsec, &ctx);
4076 if (ops) {
4077 ctx.secy = &macsec->secy;
4078 err = macsec_offload(ops->mdo_add_secy, &ctx);
4079 if (err)
4080 goto del_dev;
4081 }
4082 }
4083
4084 err = register_macsec_dev(real_dev, dev);
4085 if (err < 0)
4086 goto del_dev;
4087
4088 netif_stacked_transfer_operstate(real_dev, dev);
4089 linkwatch_fire_event(dev);
4090
4091 macsec_generation++;
4092
4093 return 0;
4094
4095del_dev:
4096 macsec_del_dev(macsec);
4097unlink:
4098 netdev_upper_dev_unlink(real_dev, dev);
4099unregister:
4100 unregister_netdevice(dev);
4101 return err;
4102}
4103
4104static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4105 struct netlink_ext_ack *extack)
4106{
4107 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4108 u8 icv_len = DEFAULT_ICV_LEN;
4109 int flag;
4110 bool es, scb, sci;
4111
4112 if (!data)
4113 return 0;
4114
4115 if (data[IFLA_MACSEC_CIPHER_SUITE])
4116 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4117
4118 if (data[IFLA_MACSEC_ICV_LEN]) {
4119 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4120 if (icv_len != DEFAULT_ICV_LEN) {
4121 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4122 struct crypto_aead *dummy_tfm;
4123
4124 dummy_tfm = macsec_alloc_tfm(dummy_key,
4125 DEFAULT_SAK_LEN,
4126 icv_len);
4127 if (IS_ERR(dummy_tfm))
4128 return PTR_ERR(dummy_tfm);
4129 crypto_free_aead(dummy_tfm);
4130 }
4131 }
4132
4133 switch (csid) {
4134 case MACSEC_CIPHER_ID_GCM_AES_128:
4135 case MACSEC_CIPHER_ID_GCM_AES_256:
4136 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4137 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4138 case MACSEC_DEFAULT_CIPHER_ID:
4139 if (icv_len < MACSEC_MIN_ICV_LEN ||
4140 icv_len > MACSEC_STD_ICV_LEN)
4141 return -EINVAL;
4142 break;
4143 default:
4144 return -EINVAL;
4145 }
4146
4147 if (data[IFLA_MACSEC_ENCODING_SA]) {
4148 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4149 return -EINVAL;
4150 }
4151
4152 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4153 flag < IFLA_MACSEC_VALIDATION;
4154 flag++) {
4155 if (data[flag]) {
4156 if (nla_get_u8(data[flag]) > 1)
4157 return -EINVAL;
4158 }
4159 }
4160
4161 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4162 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4163 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4164
4165 if ((sci && (scb || es)) || (scb && es))
4166 return -EINVAL;
4167
4168 if (data[IFLA_MACSEC_VALIDATION] &&
4169 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4170 return -EINVAL;
4171
4172 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4173 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4174 !data[IFLA_MACSEC_WINDOW])
4175 return -EINVAL;
4176
4177 return 0;
4178}
4179
4180static struct net *macsec_get_link_net(const struct net_device *dev)
4181{
4182 return dev_net(macsec_priv(dev)->real_dev);
4183}
4184
4185static size_t macsec_get_size(const struct net_device *dev)
4186{
4187 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4188 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4189 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4190 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4191 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4192 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4193 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4194 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4195 nla_total_size(1) + /* IFLA_MACSEC_ES */
4196 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4197 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4198 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4199 0;
4200}
4201
4202static int macsec_fill_info(struct sk_buff *skb,
4203 const struct net_device *dev)
4204{
4205 struct macsec_secy *secy = &macsec_priv(dev)->secy;
4206 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
4207 u64 csid;
4208
4209 switch (secy->key_len) {
4210 case MACSEC_GCM_AES_128_SAK_LEN:
4211 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4212 break;
4213 case MACSEC_GCM_AES_256_SAK_LEN:
4214 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4215 break;
4216 default:
4217 goto nla_put_failure;
4218 }
4219
4220 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4221 IFLA_MACSEC_PAD) ||
4222 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4223 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4224 csid, IFLA_MACSEC_PAD) ||
4225 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4226 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4227 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4228 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4229 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4230 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4231 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4232 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4233 0)
4234 goto nla_put_failure;
4235
4236 if (secy->replay_protect) {
4237 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4238 goto nla_put_failure;
4239 }
4240
4241 return 0;
4242
4243nla_put_failure:
4244 return -EMSGSIZE;
4245}
4246
4247static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4248 .kind = "macsec",
4249 .priv_size = sizeof(struct macsec_dev),
4250 .maxtype = IFLA_MACSEC_MAX,
4251 .policy = macsec_rtnl_policy,
4252 .setup = macsec_setup,
4253 .validate = macsec_validate_attr,
4254 .newlink = macsec_newlink,
4255 .changelink = macsec_changelink,
4256 .dellink = macsec_dellink,
4257 .get_size = macsec_get_size,
4258 .fill_info = macsec_fill_info,
4259 .get_link_net = macsec_get_link_net,
4260};
4261
4262static bool is_macsec_master(struct net_device *dev)
4263{
4264 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4265}
4266
4267static int macsec_notify(struct notifier_block *this, unsigned long event,
4268 void *ptr)
4269{
4270 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4271 LIST_HEAD(head);
4272
4273 if (!is_macsec_master(real_dev))
4274 return NOTIFY_DONE;
4275
4276 switch (event) {
4277 case NETDEV_DOWN:
4278 case NETDEV_UP:
4279 case NETDEV_CHANGE: {
4280 struct macsec_dev *m, *n;
4281 struct macsec_rxh_data *rxd;
4282
4283 rxd = macsec_data_rtnl(real_dev);
4284 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4285 struct net_device *dev = m->secy.netdev;
4286
4287 netif_stacked_transfer_operstate(real_dev, dev);
4288 }
4289 break;
4290 }
4291 case NETDEV_UNREGISTER: {
4292 struct macsec_dev *m, *n;
4293 struct macsec_rxh_data *rxd;
4294
4295 rxd = macsec_data_rtnl(real_dev);
4296 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4297 macsec_common_dellink(m->secy.netdev, &head);
4298 }
4299
4300 netdev_rx_handler_unregister(real_dev);
4301 kfree(rxd);
4302
4303 unregister_netdevice_many(&head);
4304 break;
4305 }
4306 case NETDEV_CHANGEMTU: {
4307 struct macsec_dev *m;
4308 struct macsec_rxh_data *rxd;
4309
4310 rxd = macsec_data_rtnl(real_dev);
4311 list_for_each_entry(m, &rxd->secys, secys) {
4312 struct net_device *dev = m->secy.netdev;
4313 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4314 macsec_extra_len(true));
4315
4316 if (dev->mtu > mtu)
4317 dev_set_mtu(dev, mtu);
4318 }
4319 }
4320 }
4321
4322 return NOTIFY_OK;
4323}
4324
4325static struct notifier_block macsec_notifier = {
4326 .notifier_call = macsec_notify,
4327};
4328
4329static int __init macsec_init(void)
4330{
4331 int err;
4332
4333 pr_info("MACsec IEEE 802.1AE\n");
4334 err = register_netdevice_notifier(&macsec_notifier);
4335 if (err)
4336 return err;
4337
4338 err = rtnl_link_register(&macsec_link_ops);
4339 if (err)
4340 goto notifier;
4341
4342 err = genl_register_family(&macsec_fam);
4343 if (err)
4344 goto rtnl;
4345
4346 return 0;
4347
4348rtnl:
4349 rtnl_link_unregister(&macsec_link_ops);
4350notifier:
4351 unregister_netdevice_notifier(&macsec_notifier);
4352 return err;
4353}
4354
4355static void __exit macsec_exit(void)
4356{
4357 genl_unregister_family(&macsec_fam);
4358 rtnl_link_unregister(&macsec_link_ops);
4359 unregister_netdevice_notifier(&macsec_notifier);
4360 rcu_barrier();
4361}
4362
4363module_init(macsec_init);
4364module_exit(macsec_exit);
4365
4366MODULE_ALIAS_RTNL_LINK("macsec");
4367MODULE_ALIAS_GENL_FAMILY("macsec");
4368
4369MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4370MODULE_LICENSE("GPL v2");