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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/*
2 * drivers/net/macsec.c - MACsec device
3 *
4 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/types.h>
13#include <linux/skbuff.h>
14#include <linux/socket.h>
15#include <linux/module.h>
16#include <crypto/aead.h>
17#include <linux/etherdevice.h>
18#include <linux/rtnetlink.h>
19#include <net/genetlink.h>
20#include <net/sock.h>
21
22#include <uapi/linux/if_macsec.h>
23
24typedef u64 __bitwise sci_t;
25
26#define MACSEC_SCI_LEN 8
27
28/* SecTAG length = macsec_eth_header without the optional SCI */
29#define MACSEC_TAG_LEN 6
30
31struct macsec_eth_header {
32 struct ethhdr eth;
33 /* SecTAG */
34 u8 tci_an;
35#if defined(__LITTLE_ENDIAN_BITFIELD)
36 u8 short_length:6,
37 unused:2;
38#elif defined(__BIG_ENDIAN_BITFIELD)
39 u8 unused:2,
40 short_length:6;
41#else
42#error "Please fix <asm/byteorder.h>"
43#endif
44 __be32 packet_number;
45 u8 secure_channel_id[8]; /* optional */
46} __packed;
47
48#define MACSEC_TCI_VERSION 0x80
49#define MACSEC_TCI_ES 0x40 /* end station */
50#define MACSEC_TCI_SC 0x20 /* SCI present */
51#define MACSEC_TCI_SCB 0x10 /* epon */
52#define MACSEC_TCI_E 0x08 /* encryption */
53#define MACSEC_TCI_C 0x04 /* changed text */
54#define MACSEC_AN_MASK 0x03 /* association number */
55#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
56
57/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
58#define MIN_NON_SHORT_LEN 48
59
60#define GCM_AES_IV_LEN 12
61#define DEFAULT_ICV_LEN 16
62
63#define MACSEC_NUM_AN 4 /* 2 bits for the association number */
64
65#define for_each_rxsc(secy, sc) \
66 for (sc = rcu_dereference_bh(secy->rx_sc); \
67 sc; \
68 sc = rcu_dereference_bh(sc->next))
69#define for_each_rxsc_rtnl(secy, sc) \
70 for (sc = rtnl_dereference(secy->rx_sc); \
71 sc; \
72 sc = rtnl_dereference(sc->next))
73
74struct gcm_iv {
75 union {
76 u8 secure_channel_id[8];
77 sci_t sci;
78 };
79 __be32 pn;
80};
81
82/**
83 * struct macsec_key - SA key
84 * @id: user-provided key identifier
85 * @tfm: crypto struct, key storage
86 */
87struct macsec_key {
88 u8 id[MACSEC_KEYID_LEN];
89 struct crypto_aead *tfm;
90};
91
92struct macsec_rx_sc_stats {
93 __u64 InOctetsValidated;
94 __u64 InOctetsDecrypted;
95 __u64 InPktsUnchecked;
96 __u64 InPktsDelayed;
97 __u64 InPktsOK;
98 __u64 InPktsInvalid;
99 __u64 InPktsLate;
100 __u64 InPktsNotValid;
101 __u64 InPktsNotUsingSA;
102 __u64 InPktsUnusedSA;
103};
104
105struct macsec_rx_sa_stats {
106 __u32 InPktsOK;
107 __u32 InPktsInvalid;
108 __u32 InPktsNotValid;
109 __u32 InPktsNotUsingSA;
110 __u32 InPktsUnusedSA;
111};
112
113struct macsec_tx_sa_stats {
114 __u32 OutPktsProtected;
115 __u32 OutPktsEncrypted;
116};
117
118struct macsec_tx_sc_stats {
119 __u64 OutPktsProtected;
120 __u64 OutPktsEncrypted;
121 __u64 OutOctetsProtected;
122 __u64 OutOctetsEncrypted;
123};
124
125struct macsec_dev_stats {
126 __u64 OutPktsUntagged;
127 __u64 InPktsUntagged;
128 __u64 OutPktsTooLong;
129 __u64 InPktsNoTag;
130 __u64 InPktsBadTag;
131 __u64 InPktsUnknownSCI;
132 __u64 InPktsNoSCI;
133 __u64 InPktsOverrun;
134};
135
136/**
137 * struct macsec_rx_sa - receive secure association
138 * @active:
139 * @next_pn: packet number expected for the next packet
140 * @lock: protects next_pn manipulations
141 * @key: key structure
142 * @stats: per-SA stats
143 */
144struct macsec_rx_sa {
145 struct macsec_key key;
146 spinlock_t lock;
147 u32 next_pn;
148 atomic_t refcnt;
149 bool active;
150 struct macsec_rx_sa_stats __percpu *stats;
151 struct macsec_rx_sc *sc;
152 struct rcu_head rcu;
153};
154
155struct pcpu_rx_sc_stats {
156 struct macsec_rx_sc_stats stats;
157 struct u64_stats_sync syncp;
158};
159
160/**
161 * struct macsec_rx_sc - receive secure channel
162 * @sci: secure channel identifier for this SC
163 * @active: channel is active
164 * @sa: array of secure associations
165 * @stats: per-SC stats
166 */
167struct macsec_rx_sc {
168 struct macsec_rx_sc __rcu *next;
169 sci_t sci;
170 bool active;
171 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
172 struct pcpu_rx_sc_stats __percpu *stats;
173 atomic_t refcnt;
174 struct rcu_head rcu_head;
175};
176
177/**
178 * struct macsec_tx_sa - transmit secure association
179 * @active:
180 * @next_pn: packet number to use for the next packet
181 * @lock: protects next_pn manipulations
182 * @key: key structure
183 * @stats: per-SA stats
184 */
185struct macsec_tx_sa {
186 struct macsec_key key;
187 spinlock_t lock;
188 u32 next_pn;
189 atomic_t refcnt;
190 bool active;
191 struct macsec_tx_sa_stats __percpu *stats;
192 struct rcu_head rcu;
193};
194
195struct pcpu_tx_sc_stats {
196 struct macsec_tx_sc_stats stats;
197 struct u64_stats_sync syncp;
198};
199
200/**
201 * struct macsec_tx_sc - transmit secure channel
202 * @active:
203 * @encoding_sa: association number of the SA currently in use
204 * @encrypt: encrypt packets on transmit, or authenticate only
205 * @send_sci: always include the SCI in the SecTAG
206 * @end_station:
207 * @scb: single copy broadcast flag
208 * @sa: array of secure associations
209 * @stats: stats for this TXSC
210 */
211struct macsec_tx_sc {
212 bool active;
213 u8 encoding_sa;
214 bool encrypt;
215 bool send_sci;
216 bool end_station;
217 bool scb;
218 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
219 struct pcpu_tx_sc_stats __percpu *stats;
220};
221
222#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
223
224/**
225 * struct macsec_secy - MACsec Security Entity
226 * @netdev: netdevice for this SecY
227 * @n_rx_sc: number of receive secure channels configured on this SecY
228 * @sci: secure channel identifier used for tx
229 * @key_len: length of keys used by the cipher suite
230 * @icv_len: length of ICV used by the cipher suite
231 * @validate_frames: validation mode
232 * @operational: MAC_Operational flag
233 * @protect_frames: enable protection for this SecY
234 * @replay_protect: enable packet number checks on receive
235 * @replay_window: size of the replay window
236 * @tx_sc: transmit secure channel
237 * @rx_sc: linked list of receive secure channels
238 */
239struct macsec_secy {
240 struct net_device *netdev;
241 unsigned int n_rx_sc;
242 sci_t sci;
243 u16 key_len;
244 u16 icv_len;
245 enum macsec_validation_type validate_frames;
246 bool operational;
247 bool protect_frames;
248 bool replay_protect;
249 u32 replay_window;
250 struct macsec_tx_sc tx_sc;
251 struct macsec_rx_sc __rcu *rx_sc;
252};
253
254struct pcpu_secy_stats {
255 struct macsec_dev_stats stats;
256 struct u64_stats_sync syncp;
257};
258
259/**
260 * struct macsec_dev - private data
261 * @secy: SecY config
262 * @real_dev: pointer to underlying netdevice
263 * @stats: MACsec device stats
264 * @secys: linked list of SecY's on the underlying device
265 */
266struct macsec_dev {
267 struct macsec_secy secy;
268 struct net_device *real_dev;
269 struct pcpu_secy_stats __percpu *stats;
270 struct list_head secys;
271};
272
273/**
274 * struct macsec_rxh_data - rx_handler private argument
275 * @secys: linked list of SecY's on this underlying device
276 */
277struct macsec_rxh_data {
278 struct list_head secys;
279};
280
281static struct macsec_dev *macsec_priv(const struct net_device *dev)
282{
283 return (struct macsec_dev *)netdev_priv(dev);
284}
285
286static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
287{
288 return rcu_dereference_bh(dev->rx_handler_data);
289}
290
291static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
292{
293 return rtnl_dereference(dev->rx_handler_data);
294}
295
296struct macsec_cb {
297 struct aead_request *req;
298 union {
299 struct macsec_tx_sa *tx_sa;
300 struct macsec_rx_sa *rx_sa;
301 };
302 u8 assoc_num;
303 bool valid;
304 bool has_sci;
305};
306
307static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
308{
309 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
310
311 if (!sa || !sa->active)
312 return NULL;
313
314 if (!atomic_inc_not_zero(&sa->refcnt))
315 return NULL;
316
317 return sa;
318}
319
320static void free_rx_sc_rcu(struct rcu_head *head)
321{
322 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
323
324 free_percpu(rx_sc->stats);
325 kfree(rx_sc);
326}
327
328static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
329{
330 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL;
331}
332
333static void macsec_rxsc_put(struct macsec_rx_sc *sc)
334{
335 if (atomic_dec_and_test(&sc->refcnt))
336 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
337}
338
339static void free_rxsa(struct rcu_head *head)
340{
341 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
342
343 crypto_free_aead(sa->key.tfm);
344 free_percpu(sa->stats);
345 macsec_rxsc_put(sa->sc);
346 kfree(sa);
347}
348
349static void macsec_rxsa_put(struct macsec_rx_sa *sa)
350{
351 if (atomic_dec_and_test(&sa->refcnt))
352 call_rcu(&sa->rcu, free_rxsa);
353}
354
355static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
356{
357 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
358
359 if (!sa || !sa->active)
360 return NULL;
361
362 if (!atomic_inc_not_zero(&sa->refcnt))
363 return NULL;
364
365 return sa;
366}
367
368static void free_txsa(struct rcu_head *head)
369{
370 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
371
372 crypto_free_aead(sa->key.tfm);
373 free_percpu(sa->stats);
374 kfree(sa);
375}
376
377static void macsec_txsa_put(struct macsec_tx_sa *sa)
378{
379 if (atomic_dec_and_test(&sa->refcnt))
380 call_rcu(&sa->rcu, free_txsa);
381}
382
383static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
384{
385 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
386 return (struct macsec_cb *)skb->cb;
387}
388
389#define MACSEC_PORT_ES (htons(0x0001))
390#define MACSEC_PORT_SCB (0x0000)
391#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
392
393#define DEFAULT_SAK_LEN 16
394#define DEFAULT_SEND_SCI true
395#define DEFAULT_ENCRYPT false
396#define DEFAULT_ENCODING_SA 0
397
398static sci_t make_sci(u8 *addr, __be16 port)
399{
400 sci_t sci;
401
402 memcpy(&sci, addr, ETH_ALEN);
403 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
404
405 return sci;
406}
407
408static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
409{
410 sci_t sci;
411
412 if (sci_present)
413 memcpy(&sci, hdr->secure_channel_id,
414 sizeof(hdr->secure_channel_id));
415 else
416 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
417
418 return sci;
419}
420
421static unsigned int macsec_sectag_len(bool sci_present)
422{
423 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
424}
425
426static unsigned int macsec_hdr_len(bool sci_present)
427{
428 return macsec_sectag_len(sci_present) + ETH_HLEN;
429}
430
431static unsigned int macsec_extra_len(bool sci_present)
432{
433 return macsec_sectag_len(sci_present) + sizeof(__be16);
434}
435
436/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
437static void macsec_fill_sectag(struct macsec_eth_header *h,
438 const struct macsec_secy *secy, u32 pn)
439{
440 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
441
442 memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci));
443 h->eth.h_proto = htons(ETH_P_MACSEC);
444
445 if (tx_sc->send_sci ||
446 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) {
447 h->tci_an |= MACSEC_TCI_SC;
448 memcpy(&h->secure_channel_id, &secy->sci,
449 sizeof(h->secure_channel_id));
450 } else {
451 if (tx_sc->end_station)
452 h->tci_an |= MACSEC_TCI_ES;
453 if (tx_sc->scb)
454 h->tci_an |= MACSEC_TCI_SCB;
455 }
456
457 h->packet_number = htonl(pn);
458
459 /* with GCM, C/E clear for !encrypt, both set for encrypt */
460 if (tx_sc->encrypt)
461 h->tci_an |= MACSEC_TCI_CONFID;
462 else if (secy->icv_len != DEFAULT_ICV_LEN)
463 h->tci_an |= MACSEC_TCI_C;
464
465 h->tci_an |= tx_sc->encoding_sa;
466}
467
468static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
469{
470 if (data_len < MIN_NON_SHORT_LEN)
471 h->short_length = data_len;
472}
473
474/* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
475static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
476{
477 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
478 int len = skb->len - 2 * ETH_ALEN;
479 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
480
481 /* a) It comprises at least 17 octets */
482 if (skb->len <= 16)
483 return false;
484
485 /* b) MACsec EtherType: already checked */
486
487 /* c) V bit is clear */
488 if (h->tci_an & MACSEC_TCI_VERSION)
489 return false;
490
491 /* d) ES or SCB => !SC */
492 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
493 (h->tci_an & MACSEC_TCI_SC))
494 return false;
495
496 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
497 if (h->unused)
498 return false;
499
500 /* rx.pn != 0 (figure 10-5) */
501 if (!h->packet_number)
502 return false;
503
504 /* length check, f) g) h) i) */
505 if (h->short_length)
506 return len == extra_len + h->short_length;
507 return len >= extra_len + MIN_NON_SHORT_LEN;
508}
509
510#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
511#define MACSEC_NEEDED_TAILROOM MACSEC_MAX_ICV_LEN
512
513static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
514{
515 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
516
517 gcm_iv->sci = sci;
518 gcm_iv->pn = htonl(pn);
519}
520
521static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
522{
523 return (struct macsec_eth_header *)skb_mac_header(skb);
524}
525
526static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
527{
528 u32 pn;
529
530 spin_lock_bh(&tx_sa->lock);
531 pn = tx_sa->next_pn;
532
533 tx_sa->next_pn++;
534 if (tx_sa->next_pn == 0) {
535 pr_debug("PN wrapped, transitioning to !oper\n");
536 tx_sa->active = false;
537 if (secy->protect_frames)
538 secy->operational = false;
539 }
540 spin_unlock_bh(&tx_sa->lock);
541
542 return pn;
543}
544
545static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
546{
547 struct macsec_dev *macsec = netdev_priv(dev);
548
549 skb->dev = macsec->real_dev;
550 skb_reset_mac_header(skb);
551 skb->protocol = eth_hdr(skb)->h_proto;
552}
553
554static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
555 struct macsec_tx_sa *tx_sa)
556{
557 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
558
559 u64_stats_update_begin(&txsc_stats->syncp);
560 if (tx_sc->encrypt) {
561 txsc_stats->stats.OutOctetsEncrypted += skb->len;
562 txsc_stats->stats.OutPktsEncrypted++;
563 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
564 } else {
565 txsc_stats->stats.OutOctetsProtected += skb->len;
566 txsc_stats->stats.OutPktsProtected++;
567 this_cpu_inc(tx_sa->stats->OutPktsProtected);
568 }
569 u64_stats_update_end(&txsc_stats->syncp);
570}
571
572static void count_tx(struct net_device *dev, int ret, int len)
573{
574 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
575 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
576
577 u64_stats_update_begin(&stats->syncp);
578 stats->tx_packets++;
579 stats->tx_bytes += len;
580 u64_stats_update_end(&stats->syncp);
581 } else {
582 dev->stats.tx_dropped++;
583 }
584}
585
586static void macsec_encrypt_done(struct crypto_async_request *base, int err)
587{
588 struct sk_buff *skb = base->data;
589 struct net_device *dev = skb->dev;
590 struct macsec_dev *macsec = macsec_priv(dev);
591 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
592 int len, ret;
593
594 aead_request_free(macsec_skb_cb(skb)->req);
595
596 rcu_read_lock_bh();
597 macsec_encrypt_finish(skb, dev);
598 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
599 len = skb->len;
600 ret = dev_queue_xmit(skb);
601 count_tx(dev, ret, len);
602 rcu_read_unlock_bh();
603
604 macsec_txsa_put(sa);
605 dev_put(dev);
606}
607
608static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
609 struct net_device *dev)
610{
611 int ret;
612 struct scatterlist sg[MAX_SKB_FRAGS + 1];
613 unsigned char iv[GCM_AES_IV_LEN];
614 struct ethhdr *eth;
615 struct macsec_eth_header *hh;
616 size_t unprotected_len;
617 struct aead_request *req;
618 struct macsec_secy *secy;
619 struct macsec_tx_sc *tx_sc;
620 struct macsec_tx_sa *tx_sa;
621 struct macsec_dev *macsec = macsec_priv(dev);
622 u32 pn;
623
624 secy = &macsec->secy;
625 tx_sc = &secy->tx_sc;
626
627 /* 10.5.1 TX SA assignment */
628 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
629 if (!tx_sa) {
630 secy->operational = false;
631 kfree_skb(skb);
632 return ERR_PTR(-EINVAL);
633 }
634
635 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
636 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
637 struct sk_buff *nskb = skb_copy_expand(skb,
638 MACSEC_NEEDED_HEADROOM,
639 MACSEC_NEEDED_TAILROOM,
640 GFP_ATOMIC);
641 if (likely(nskb)) {
642 consume_skb(skb);
643 skb = nskb;
644 } else {
645 macsec_txsa_put(tx_sa);
646 kfree_skb(skb);
647 return ERR_PTR(-ENOMEM);
648 }
649 } else {
650 skb = skb_unshare(skb, GFP_ATOMIC);
651 if (!skb) {
652 macsec_txsa_put(tx_sa);
653 return ERR_PTR(-ENOMEM);
654 }
655 }
656
657 unprotected_len = skb->len;
658 eth = eth_hdr(skb);
659 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci));
660 memmove(hh, eth, 2 * ETH_ALEN);
661
662 pn = tx_sa_update_pn(tx_sa, secy);
663 if (pn == 0) {
664 macsec_txsa_put(tx_sa);
665 kfree_skb(skb);
666 return ERR_PTR(-ENOLINK);
667 }
668 macsec_fill_sectag(hh, secy, pn);
669 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
670
671 macsec_fill_iv(iv, secy->sci, pn);
672
673 skb_put(skb, secy->icv_len);
674
675 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
676 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
677
678 u64_stats_update_begin(&secy_stats->syncp);
679 secy_stats->stats.OutPktsTooLong++;
680 u64_stats_update_end(&secy_stats->syncp);
681
682 macsec_txsa_put(tx_sa);
683 kfree_skb(skb);
684 return ERR_PTR(-EINVAL);
685 }
686
687 req = aead_request_alloc(tx_sa->key.tfm, GFP_ATOMIC);
688 if (!req) {
689 macsec_txsa_put(tx_sa);
690 kfree_skb(skb);
691 return ERR_PTR(-ENOMEM);
692 }
693
694 sg_init_table(sg, MAX_SKB_FRAGS + 1);
695 skb_to_sgvec(skb, sg, 0, skb->len);
696
697 if (tx_sc->encrypt) {
698 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) -
699 secy->icv_len;
700 aead_request_set_crypt(req, sg, sg, len, iv);
701 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci));
702 } else {
703 aead_request_set_crypt(req, sg, sg, 0, iv);
704 aead_request_set_ad(req, skb->len - secy->icv_len);
705 }
706
707 macsec_skb_cb(skb)->req = req;
708 macsec_skb_cb(skb)->tx_sa = tx_sa;
709 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
710
711 dev_hold(skb->dev);
712 ret = crypto_aead_encrypt(req);
713 if (ret == -EINPROGRESS) {
714 return ERR_PTR(ret);
715 } else if (ret != 0) {
716 dev_put(skb->dev);
717 kfree_skb(skb);
718 aead_request_free(req);
719 macsec_txsa_put(tx_sa);
720 return ERR_PTR(-EINVAL);
721 }
722
723 dev_put(skb->dev);
724 aead_request_free(req);
725 macsec_txsa_put(tx_sa);
726
727 return skb;
728}
729
730static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
731{
732 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
733 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
734 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
735 u32 lowest_pn = 0;
736
737 spin_lock(&rx_sa->lock);
738 if (rx_sa->next_pn >= secy->replay_window)
739 lowest_pn = rx_sa->next_pn - secy->replay_window;
740
741 /* Now perform replay protection check again
742 * (see IEEE 802.1AE-2006 figure 10-5)
743 */
744 if (secy->replay_protect && pn < lowest_pn) {
745 spin_unlock(&rx_sa->lock);
746 u64_stats_update_begin(&rxsc_stats->syncp);
747 rxsc_stats->stats.InPktsLate++;
748 u64_stats_update_end(&rxsc_stats->syncp);
749 return false;
750 }
751
752 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
753 u64_stats_update_begin(&rxsc_stats->syncp);
754 if (hdr->tci_an & MACSEC_TCI_E)
755 rxsc_stats->stats.InOctetsDecrypted += skb->len;
756 else
757 rxsc_stats->stats.InOctetsValidated += skb->len;
758 u64_stats_update_end(&rxsc_stats->syncp);
759 }
760
761 if (!macsec_skb_cb(skb)->valid) {
762 spin_unlock(&rx_sa->lock);
763
764 /* 10.6.5 */
765 if (hdr->tci_an & MACSEC_TCI_C ||
766 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
767 u64_stats_update_begin(&rxsc_stats->syncp);
768 rxsc_stats->stats.InPktsNotValid++;
769 u64_stats_update_end(&rxsc_stats->syncp);
770 return false;
771 }
772
773 u64_stats_update_begin(&rxsc_stats->syncp);
774 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
775 rxsc_stats->stats.InPktsInvalid++;
776 this_cpu_inc(rx_sa->stats->InPktsInvalid);
777 } else if (pn < lowest_pn) {
778 rxsc_stats->stats.InPktsDelayed++;
779 } else {
780 rxsc_stats->stats.InPktsUnchecked++;
781 }
782 u64_stats_update_end(&rxsc_stats->syncp);
783 } else {
784 u64_stats_update_begin(&rxsc_stats->syncp);
785 if (pn < lowest_pn) {
786 rxsc_stats->stats.InPktsDelayed++;
787 } else {
788 rxsc_stats->stats.InPktsOK++;
789 this_cpu_inc(rx_sa->stats->InPktsOK);
790 }
791 u64_stats_update_end(&rxsc_stats->syncp);
792
793 if (pn >= rx_sa->next_pn)
794 rx_sa->next_pn = pn + 1;
795 spin_unlock(&rx_sa->lock);
796 }
797
798 return true;
799}
800
801static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
802{
803 skb->pkt_type = PACKET_HOST;
804 skb->protocol = eth_type_trans(skb, dev);
805
806 skb_reset_network_header(skb);
807 if (!skb_transport_header_was_set(skb))
808 skb_reset_transport_header(skb);
809 skb_reset_mac_len(skb);
810}
811
812static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
813{
814 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
815 skb_pull(skb, hdr_len);
816 pskb_trim_unique(skb, skb->len - icv_len);
817}
818
819static void count_rx(struct net_device *dev, int len)
820{
821 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
822
823 u64_stats_update_begin(&stats->syncp);
824 stats->rx_packets++;
825 stats->rx_bytes += len;
826 u64_stats_update_end(&stats->syncp);
827}
828
829static void macsec_decrypt_done(struct crypto_async_request *base, int err)
830{
831 struct sk_buff *skb = base->data;
832 struct net_device *dev = skb->dev;
833 struct macsec_dev *macsec = macsec_priv(dev);
834 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
835 int len, ret;
836 u32 pn;
837
838 aead_request_free(macsec_skb_cb(skb)->req);
839
840 rcu_read_lock_bh();
841 pn = ntohl(macsec_ethhdr(skb)->packet_number);
842 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
843 rcu_read_unlock_bh();
844 kfree_skb(skb);
845 goto out;
846 }
847
848 macsec_finalize_skb(skb, macsec->secy.icv_len,
849 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
850 macsec_reset_skb(skb, macsec->secy.netdev);
851
852 len = skb->len;
853 ret = netif_rx(skb);
854 if (ret == NET_RX_SUCCESS)
855 count_rx(dev, len);
856 else
857 macsec->secy.netdev->stats.rx_dropped++;
858
859 rcu_read_unlock_bh();
860
861out:
862 macsec_rxsa_put(rx_sa);
863 dev_put(dev);
864 return;
865}
866
867static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
868 struct net_device *dev,
869 struct macsec_rx_sa *rx_sa,
870 sci_t sci,
871 struct macsec_secy *secy)
872{
873 int ret;
874 struct scatterlist sg[MAX_SKB_FRAGS + 1];
875 unsigned char iv[GCM_AES_IV_LEN];
876 struct aead_request *req;
877 struct macsec_eth_header *hdr;
878 u16 icv_len = secy->icv_len;
879
880 macsec_skb_cb(skb)->valid = false;
881 skb = skb_share_check(skb, GFP_ATOMIC);
882 if (!skb)
883 return ERR_PTR(-ENOMEM);
884
885 req = aead_request_alloc(rx_sa->key.tfm, GFP_ATOMIC);
886 if (!req) {
887 kfree_skb(skb);
888 return ERR_PTR(-ENOMEM);
889 }
890
891 hdr = (struct macsec_eth_header *)skb->data;
892 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
893
894 sg_init_table(sg, MAX_SKB_FRAGS + 1);
895 skb_to_sgvec(skb, sg, 0, skb->len);
896
897 if (hdr->tci_an & MACSEC_TCI_E) {
898 /* confidentiality: ethernet + macsec header
899 * authenticated, encrypted payload
900 */
901 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
902
903 aead_request_set_crypt(req, sg, sg, len, iv);
904 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
905 skb = skb_unshare(skb, GFP_ATOMIC);
906 if (!skb) {
907 aead_request_free(req);
908 return ERR_PTR(-ENOMEM);
909 }
910 } else {
911 /* integrity only: all headers + data authenticated */
912 aead_request_set_crypt(req, sg, sg, icv_len, iv);
913 aead_request_set_ad(req, skb->len - icv_len);
914 }
915
916 macsec_skb_cb(skb)->req = req;
917 macsec_skb_cb(skb)->rx_sa = rx_sa;
918 skb->dev = dev;
919 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
920
921 dev_hold(dev);
922 ret = crypto_aead_decrypt(req);
923 if (ret == -EINPROGRESS) {
924 return ERR_PTR(ret);
925 } else if (ret != 0) {
926 /* decryption/authentication failed
927 * 10.6 if validateFrames is disabled, deliver anyway
928 */
929 if (ret != -EBADMSG) {
930 kfree_skb(skb);
931 skb = ERR_PTR(ret);
932 }
933 } else {
934 macsec_skb_cb(skb)->valid = true;
935 }
936 dev_put(dev);
937
938 aead_request_free(req);
939
940 return skb;
941}
942
943static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
944{
945 struct macsec_rx_sc *rx_sc;
946
947 for_each_rxsc(secy, rx_sc) {
948 if (rx_sc->sci == sci)
949 return rx_sc;
950 }
951
952 return NULL;
953}
954
955static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
956{
957 struct macsec_rx_sc *rx_sc;
958
959 for_each_rxsc_rtnl(secy, rx_sc) {
960 if (rx_sc->sci == sci)
961 return rx_sc;
962 }
963
964 return NULL;
965}
966
967static void handle_not_macsec(struct sk_buff *skb)
968{
969 struct macsec_rxh_data *rxd;
970 struct macsec_dev *macsec;
971
972 rcu_read_lock();
973 rxd = macsec_data_rcu(skb->dev);
974
975 /* 10.6 If the management control validateFrames is not
976 * Strict, frames without a SecTAG are received, counted, and
977 * delivered to the Controlled Port
978 */
979 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
980 struct sk_buff *nskb;
981 int ret;
982 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
983
984 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
985 u64_stats_update_begin(&secy_stats->syncp);
986 secy_stats->stats.InPktsNoTag++;
987 u64_stats_update_end(&secy_stats->syncp);
988 continue;
989 }
990
991 /* deliver on this port */
992 nskb = skb_clone(skb, GFP_ATOMIC);
993 if (!nskb)
994 break;
995
996 nskb->dev = macsec->secy.netdev;
997
998 ret = netif_rx(nskb);
999 if (ret == NET_RX_SUCCESS) {
1000 u64_stats_update_begin(&secy_stats->syncp);
1001 secy_stats->stats.InPktsUntagged++;
1002 u64_stats_update_end(&secy_stats->syncp);
1003 } else {
1004 macsec->secy.netdev->stats.rx_dropped++;
1005 }
1006 }
1007
1008 rcu_read_unlock();
1009}
1010
1011static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1012{
1013 struct sk_buff *skb = *pskb;
1014 struct net_device *dev = skb->dev;
1015 struct macsec_eth_header *hdr;
1016 struct macsec_secy *secy = NULL;
1017 struct macsec_rx_sc *rx_sc;
1018 struct macsec_rx_sa *rx_sa;
1019 struct macsec_rxh_data *rxd;
1020 struct macsec_dev *macsec;
1021 sci_t sci;
1022 u32 pn;
1023 bool cbit;
1024 struct pcpu_rx_sc_stats *rxsc_stats;
1025 struct pcpu_secy_stats *secy_stats;
1026 bool pulled_sci;
1027
1028 if (skb_headroom(skb) < ETH_HLEN)
1029 goto drop_direct;
1030
1031 hdr = macsec_ethhdr(skb);
1032 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1033 handle_not_macsec(skb);
1034
1035 /* and deliver to the uncontrolled port */
1036 return RX_HANDLER_PASS;
1037 }
1038
1039 skb = skb_unshare(skb, GFP_ATOMIC);
1040 if (!skb) {
1041 *pskb = NULL;
1042 return RX_HANDLER_CONSUMED;
1043 }
1044
1045 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1046 if (!pulled_sci) {
1047 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1048 goto drop_direct;
1049 }
1050
1051 hdr = macsec_ethhdr(skb);
1052
1053 /* Frames with a SecTAG that has the TCI E bit set but the C
1054 * bit clear are discarded, as this reserved encoding is used
1055 * to identify frames with a SecTAG that are not to be
1056 * delivered to the Controlled Port.
1057 */
1058 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1059 return RX_HANDLER_PASS;
1060
1061 /* now, pull the extra length */
1062 if (hdr->tci_an & MACSEC_TCI_SC) {
1063 if (!pulled_sci)
1064 goto drop_direct;
1065 }
1066
1067 /* ethernet header is part of crypto processing */
1068 skb_push(skb, ETH_HLEN);
1069
1070 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1071 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1072 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1073
1074 rcu_read_lock();
1075 rxd = macsec_data_rcu(skb->dev);
1076
1077 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1078 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1079
1080 if (sc) {
1081 secy = &macsec->secy;
1082 rx_sc = sc;
1083 break;
1084 }
1085 }
1086
1087 if (!secy)
1088 goto nosci;
1089
1090 dev = secy->netdev;
1091 macsec = macsec_priv(dev);
1092 secy_stats = this_cpu_ptr(macsec->stats);
1093 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1094
1095 if (!macsec_validate_skb(skb, secy->icv_len)) {
1096 u64_stats_update_begin(&secy_stats->syncp);
1097 secy_stats->stats.InPktsBadTag++;
1098 u64_stats_update_end(&secy_stats->syncp);
1099 goto drop_nosa;
1100 }
1101
1102 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1103 if (!rx_sa) {
1104 /* 10.6.1 if the SA is not in use */
1105
1106 /* If validateFrames is Strict or the C bit in the
1107 * SecTAG is set, discard
1108 */
1109 if (hdr->tci_an & MACSEC_TCI_C ||
1110 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1111 u64_stats_update_begin(&rxsc_stats->syncp);
1112 rxsc_stats->stats.InPktsNotUsingSA++;
1113 u64_stats_update_end(&rxsc_stats->syncp);
1114 goto drop_nosa;
1115 }
1116
1117 /* not Strict, the frame (with the SecTAG and ICV
1118 * removed) is delivered to the Controlled Port.
1119 */
1120 u64_stats_update_begin(&rxsc_stats->syncp);
1121 rxsc_stats->stats.InPktsUnusedSA++;
1122 u64_stats_update_end(&rxsc_stats->syncp);
1123 goto deliver;
1124 }
1125
1126 /* First, PN check to avoid decrypting obviously wrong packets */
1127 pn = ntohl(hdr->packet_number);
1128 if (secy->replay_protect) {
1129 bool late;
1130
1131 spin_lock(&rx_sa->lock);
1132 late = rx_sa->next_pn >= secy->replay_window &&
1133 pn < (rx_sa->next_pn - secy->replay_window);
1134 spin_unlock(&rx_sa->lock);
1135
1136 if (late) {
1137 u64_stats_update_begin(&rxsc_stats->syncp);
1138 rxsc_stats->stats.InPktsLate++;
1139 u64_stats_update_end(&rxsc_stats->syncp);
1140 goto drop;
1141 }
1142 }
1143
1144 /* Disabled && !changed text => skip validation */
1145 if (hdr->tci_an & MACSEC_TCI_C ||
1146 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1147 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1148
1149 if (IS_ERR(skb)) {
1150 /* the decrypt callback needs the reference */
1151 if (PTR_ERR(skb) != -EINPROGRESS)
1152 macsec_rxsa_put(rx_sa);
1153 rcu_read_unlock();
1154 *pskb = NULL;
1155 return RX_HANDLER_CONSUMED;
1156 }
1157
1158 if (!macsec_post_decrypt(skb, secy, pn))
1159 goto drop;
1160
1161deliver:
1162 macsec_finalize_skb(skb, secy->icv_len,
1163 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1164 macsec_reset_skb(skb, secy->netdev);
1165
1166 if (rx_sa)
1167 macsec_rxsa_put(rx_sa);
1168 count_rx(dev, skb->len);
1169
1170 rcu_read_unlock();
1171
1172 *pskb = skb;
1173 return RX_HANDLER_ANOTHER;
1174
1175drop:
1176 macsec_rxsa_put(rx_sa);
1177drop_nosa:
1178 rcu_read_unlock();
1179drop_direct:
1180 kfree_skb(skb);
1181 *pskb = NULL;
1182 return RX_HANDLER_CONSUMED;
1183
1184nosci:
1185 /* 10.6.1 if the SC is not found */
1186 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1187 if (!cbit)
1188 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1189 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1190
1191 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1192 struct sk_buff *nskb;
1193 int ret;
1194
1195 secy_stats = this_cpu_ptr(macsec->stats);
1196
1197 /* If validateFrames is Strict or the C bit in the
1198 * SecTAG is set, discard
1199 */
1200 if (cbit ||
1201 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1202 u64_stats_update_begin(&secy_stats->syncp);
1203 secy_stats->stats.InPktsNoSCI++;
1204 u64_stats_update_end(&secy_stats->syncp);
1205 continue;
1206 }
1207
1208 /* not strict, the frame (with the SecTAG and ICV
1209 * removed) is delivered to the Controlled Port.
1210 */
1211 nskb = skb_clone(skb, GFP_ATOMIC);
1212 if (!nskb)
1213 break;
1214
1215 macsec_reset_skb(nskb, macsec->secy.netdev);
1216
1217 ret = netif_rx(nskb);
1218 if (ret == NET_RX_SUCCESS) {
1219 u64_stats_update_begin(&secy_stats->syncp);
1220 secy_stats->stats.InPktsUnknownSCI++;
1221 u64_stats_update_end(&secy_stats->syncp);
1222 } else {
1223 macsec->secy.netdev->stats.rx_dropped++;
1224 }
1225 }
1226
1227 rcu_read_unlock();
1228 *pskb = skb;
1229 return RX_HANDLER_PASS;
1230}
1231
1232static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1233{
1234 struct crypto_aead *tfm;
1235 int ret;
1236
1237 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1238 if (!tfm || IS_ERR(tfm))
1239 return NULL;
1240
1241 ret = crypto_aead_setkey(tfm, key, key_len);
1242 if (ret < 0) {
1243 crypto_free_aead(tfm);
1244 return NULL;
1245 }
1246
1247 ret = crypto_aead_setauthsize(tfm, icv_len);
1248 if (ret < 0) {
1249 crypto_free_aead(tfm);
1250 return NULL;
1251 }
1252
1253 return tfm;
1254}
1255
1256static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1257 int icv_len)
1258{
1259 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1260 if (!rx_sa->stats)
1261 return -1;
1262
1263 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1264 if (!rx_sa->key.tfm) {
1265 free_percpu(rx_sa->stats);
1266 return -1;
1267 }
1268
1269 rx_sa->active = false;
1270 rx_sa->next_pn = 1;
1271 atomic_set(&rx_sa->refcnt, 1);
1272 spin_lock_init(&rx_sa->lock);
1273
1274 return 0;
1275}
1276
1277static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1278{
1279 rx_sa->active = false;
1280
1281 macsec_rxsa_put(rx_sa);
1282}
1283
1284static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1285{
1286 int i;
1287
1288 for (i = 0; i < MACSEC_NUM_AN; i++) {
1289 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1290
1291 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1292 if (sa)
1293 clear_rx_sa(sa);
1294 }
1295
1296 macsec_rxsc_put(rx_sc);
1297}
1298
1299static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1300{
1301 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1302
1303 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1304 rx_sc;
1305 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1306 if (rx_sc->sci == sci) {
1307 if (rx_sc->active)
1308 secy->n_rx_sc--;
1309 rcu_assign_pointer(*rx_scp, rx_sc->next);
1310 return rx_sc;
1311 }
1312 }
1313
1314 return NULL;
1315}
1316
1317static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1318{
1319 struct macsec_rx_sc *rx_sc;
1320 struct macsec_dev *macsec;
1321 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1322 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1323 struct macsec_secy *secy;
1324
1325 list_for_each_entry(macsec, &rxd->secys, secys) {
1326 if (find_rx_sc_rtnl(&macsec->secy, sci))
1327 return ERR_PTR(-EEXIST);
1328 }
1329
1330 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1331 if (!rx_sc)
1332 return ERR_PTR(-ENOMEM);
1333
1334 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1335 if (!rx_sc->stats) {
1336 kfree(rx_sc);
1337 return ERR_PTR(-ENOMEM);
1338 }
1339
1340 rx_sc->sci = sci;
1341 rx_sc->active = true;
1342 atomic_set(&rx_sc->refcnt, 1);
1343
1344 secy = &macsec_priv(dev)->secy;
1345 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1346 rcu_assign_pointer(secy->rx_sc, rx_sc);
1347
1348 if (rx_sc->active)
1349 secy->n_rx_sc++;
1350
1351 return rx_sc;
1352}
1353
1354static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1355 int icv_len)
1356{
1357 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1358 if (!tx_sa->stats)
1359 return -1;
1360
1361 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1362 if (!tx_sa->key.tfm) {
1363 free_percpu(tx_sa->stats);
1364 return -1;
1365 }
1366
1367 tx_sa->active = false;
1368 atomic_set(&tx_sa->refcnt, 1);
1369 spin_lock_init(&tx_sa->lock);
1370
1371 return 0;
1372}
1373
1374static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1375{
1376 tx_sa->active = false;
1377
1378 macsec_txsa_put(tx_sa);
1379}
1380
1381static struct genl_family macsec_fam = {
1382 .id = GENL_ID_GENERATE,
1383 .name = MACSEC_GENL_NAME,
1384 .hdrsize = 0,
1385 .version = MACSEC_GENL_VERSION,
1386 .maxattr = MACSEC_ATTR_MAX,
1387 .netnsok = true,
1388};
1389
1390static struct net_device *get_dev_from_nl(struct net *net,
1391 struct nlattr **attrs)
1392{
1393 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1394 struct net_device *dev;
1395
1396 dev = __dev_get_by_index(net, ifindex);
1397 if (!dev)
1398 return ERR_PTR(-ENODEV);
1399
1400 if (!netif_is_macsec(dev))
1401 return ERR_PTR(-ENODEV);
1402
1403 return dev;
1404}
1405
1406static sci_t nla_get_sci(const struct nlattr *nla)
1407{
1408 return (__force sci_t)nla_get_u64(nla);
1409}
1410
1411static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value)
1412{
1413 return nla_put_u64(skb, attrtype, (__force u64)value);
1414}
1415
1416static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1417 struct nlattr **attrs,
1418 struct nlattr **tb_sa,
1419 struct net_device **devp,
1420 struct macsec_secy **secyp,
1421 struct macsec_tx_sc **scp,
1422 u8 *assoc_num)
1423{
1424 struct net_device *dev;
1425 struct macsec_secy *secy;
1426 struct macsec_tx_sc *tx_sc;
1427 struct macsec_tx_sa *tx_sa;
1428
1429 if (!tb_sa[MACSEC_SA_ATTR_AN])
1430 return ERR_PTR(-EINVAL);
1431
1432 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1433
1434 dev = get_dev_from_nl(net, attrs);
1435 if (IS_ERR(dev))
1436 return ERR_CAST(dev);
1437
1438 if (*assoc_num >= MACSEC_NUM_AN)
1439 return ERR_PTR(-EINVAL);
1440
1441 secy = &macsec_priv(dev)->secy;
1442 tx_sc = &secy->tx_sc;
1443
1444 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1445 if (!tx_sa)
1446 return ERR_PTR(-ENODEV);
1447
1448 *devp = dev;
1449 *scp = tx_sc;
1450 *secyp = secy;
1451 return tx_sa;
1452}
1453
1454static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1455 struct nlattr **attrs,
1456 struct nlattr **tb_rxsc,
1457 struct net_device **devp,
1458 struct macsec_secy **secyp)
1459{
1460 struct net_device *dev;
1461 struct macsec_secy *secy;
1462 struct macsec_rx_sc *rx_sc;
1463 sci_t sci;
1464
1465 dev = get_dev_from_nl(net, attrs);
1466 if (IS_ERR(dev))
1467 return ERR_CAST(dev);
1468
1469 secy = &macsec_priv(dev)->secy;
1470
1471 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1472 return ERR_PTR(-EINVAL);
1473
1474 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1475 rx_sc = find_rx_sc_rtnl(secy, sci);
1476 if (!rx_sc)
1477 return ERR_PTR(-ENODEV);
1478
1479 *secyp = secy;
1480 *devp = dev;
1481
1482 return rx_sc;
1483}
1484
1485static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1486 struct nlattr **attrs,
1487 struct nlattr **tb_rxsc,
1488 struct nlattr **tb_sa,
1489 struct net_device **devp,
1490 struct macsec_secy **secyp,
1491 struct macsec_rx_sc **scp,
1492 u8 *assoc_num)
1493{
1494 struct macsec_rx_sc *rx_sc;
1495 struct macsec_rx_sa *rx_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 if (*assoc_num >= MACSEC_NUM_AN)
1502 return ERR_PTR(-EINVAL);
1503
1504 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1505 if (IS_ERR(rx_sc))
1506 return ERR_CAST(rx_sc);
1507
1508 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1509 if (!rx_sa)
1510 return ERR_PTR(-ENODEV);
1511
1512 *scp = rx_sc;
1513 return rx_sa;
1514}
1515
1516
1517static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1518 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1519 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1520 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1521};
1522
1523static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1524 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1525 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1526};
1527
1528static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1529 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1530 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1531 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1532 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1533 .len = MACSEC_KEYID_LEN, },
1534 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1535 .len = MACSEC_MAX_KEY_LEN, },
1536};
1537
1538static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1539{
1540 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1541 return -EINVAL;
1542
1543 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1544 macsec_genl_sa_policy))
1545 return -EINVAL;
1546
1547 return 0;
1548}
1549
1550static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1551{
1552 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1553 return -EINVAL;
1554
1555 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1556 macsec_genl_rxsc_policy))
1557 return -EINVAL;
1558
1559 return 0;
1560}
1561
1562static bool validate_add_rxsa(struct nlattr **attrs)
1563{
1564 if (!attrs[MACSEC_SA_ATTR_AN] ||
1565 !attrs[MACSEC_SA_ATTR_KEY] ||
1566 !attrs[MACSEC_SA_ATTR_KEYID])
1567 return false;
1568
1569 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1570 return false;
1571
1572 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1573 return false;
1574
1575 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1576 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1577 return false;
1578 }
1579
1580 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1581 return false;
1582
1583 return true;
1584}
1585
1586static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1587{
1588 struct net_device *dev;
1589 struct nlattr **attrs = info->attrs;
1590 struct macsec_secy *secy;
1591 struct macsec_rx_sc *rx_sc;
1592 struct macsec_rx_sa *rx_sa;
1593 unsigned char assoc_num;
1594 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1595 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1596
1597 if (!attrs[MACSEC_ATTR_IFINDEX])
1598 return -EINVAL;
1599
1600 if (parse_sa_config(attrs, tb_sa))
1601 return -EINVAL;
1602
1603 if (parse_rxsc_config(attrs, tb_rxsc))
1604 return -EINVAL;
1605
1606 if (!validate_add_rxsa(tb_sa))
1607 return -EINVAL;
1608
1609 rtnl_lock();
1610 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1611 if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) {
1612 rtnl_unlock();
1613 return PTR_ERR(rx_sc);
1614 }
1615
1616 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1617
1618 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1619 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1620 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1621 rtnl_unlock();
1622 return -EINVAL;
1623 }
1624
1625 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1626 if (rx_sa) {
1627 rtnl_unlock();
1628 return -EBUSY;
1629 }
1630
1631 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1632 if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1633 secy->key_len, secy->icv_len)) {
1634 kfree(rx_sa);
1635 rtnl_unlock();
1636 return -ENOMEM;
1637 }
1638
1639 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1640 spin_lock_bh(&rx_sa->lock);
1641 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1642 spin_unlock_bh(&rx_sa->lock);
1643 }
1644
1645 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1646 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1647
1648 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEY], MACSEC_KEYID_LEN);
1649 rx_sa->sc = rx_sc;
1650 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1651
1652 rtnl_unlock();
1653
1654 return 0;
1655}
1656
1657static bool validate_add_rxsc(struct nlattr **attrs)
1658{
1659 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1660 return false;
1661
1662 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1663 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1664 return false;
1665 }
1666
1667 return true;
1668}
1669
1670static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1671{
1672 struct net_device *dev;
1673 sci_t sci = MACSEC_UNDEF_SCI;
1674 struct nlattr **attrs = info->attrs;
1675 struct macsec_rx_sc *rx_sc;
1676 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1677
1678 if (!attrs[MACSEC_ATTR_IFINDEX])
1679 return -EINVAL;
1680
1681 if (parse_rxsc_config(attrs, tb_rxsc))
1682 return -EINVAL;
1683
1684 if (!validate_add_rxsc(tb_rxsc))
1685 return -EINVAL;
1686
1687 rtnl_lock();
1688 dev = get_dev_from_nl(genl_info_net(info), attrs);
1689 if (IS_ERR(dev)) {
1690 rtnl_unlock();
1691 return PTR_ERR(dev);
1692 }
1693
1694 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1695
1696 rx_sc = create_rx_sc(dev, sci);
1697 if (IS_ERR(rx_sc)) {
1698 rtnl_unlock();
1699 return PTR_ERR(rx_sc);
1700 }
1701
1702 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1703 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1704
1705 rtnl_unlock();
1706
1707 return 0;
1708}
1709
1710static bool validate_add_txsa(struct nlattr **attrs)
1711{
1712 if (!attrs[MACSEC_SA_ATTR_AN] ||
1713 !attrs[MACSEC_SA_ATTR_PN] ||
1714 !attrs[MACSEC_SA_ATTR_KEY] ||
1715 !attrs[MACSEC_SA_ATTR_KEYID])
1716 return false;
1717
1718 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1719 return false;
1720
1721 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1722 return false;
1723
1724 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1725 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1726 return false;
1727 }
1728
1729 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1730 return false;
1731
1732 return true;
1733}
1734
1735static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1736{
1737 struct net_device *dev;
1738 struct nlattr **attrs = info->attrs;
1739 struct macsec_secy *secy;
1740 struct macsec_tx_sc *tx_sc;
1741 struct macsec_tx_sa *tx_sa;
1742 unsigned char assoc_num;
1743 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1744
1745 if (!attrs[MACSEC_ATTR_IFINDEX])
1746 return -EINVAL;
1747
1748 if (parse_sa_config(attrs, tb_sa))
1749 return -EINVAL;
1750
1751 if (!validate_add_txsa(tb_sa))
1752 return -EINVAL;
1753
1754 rtnl_lock();
1755 dev = get_dev_from_nl(genl_info_net(info), attrs);
1756 if (IS_ERR(dev)) {
1757 rtnl_unlock();
1758 return PTR_ERR(dev);
1759 }
1760
1761 secy = &macsec_priv(dev)->secy;
1762 tx_sc = &secy->tx_sc;
1763
1764 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1765
1766 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1767 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1768 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1769 rtnl_unlock();
1770 return -EINVAL;
1771 }
1772
1773 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1774 if (tx_sa) {
1775 rtnl_unlock();
1776 return -EBUSY;
1777 }
1778
1779 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1780 if (!tx_sa || init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1781 secy->key_len, secy->icv_len)) {
1782 kfree(tx_sa);
1783 rtnl_unlock();
1784 return -ENOMEM;
1785 }
1786
1787 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEY], MACSEC_KEYID_LEN);
1788
1789 spin_lock_bh(&tx_sa->lock);
1790 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1791 spin_unlock_bh(&tx_sa->lock);
1792
1793 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1794 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1795
1796 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1797 secy->operational = true;
1798
1799 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1800
1801 rtnl_unlock();
1802
1803 return 0;
1804}
1805
1806static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1807{
1808 struct nlattr **attrs = info->attrs;
1809 struct net_device *dev;
1810 struct macsec_secy *secy;
1811 struct macsec_rx_sc *rx_sc;
1812 struct macsec_rx_sa *rx_sa;
1813 u8 assoc_num;
1814 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1815 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1816
1817 if (!attrs[MACSEC_ATTR_IFINDEX])
1818 return -EINVAL;
1819
1820 if (parse_sa_config(attrs, tb_sa))
1821 return -EINVAL;
1822
1823 if (parse_rxsc_config(attrs, tb_rxsc))
1824 return -EINVAL;
1825
1826 rtnl_lock();
1827 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1828 &dev, &secy, &rx_sc, &assoc_num);
1829 if (IS_ERR(rx_sa)) {
1830 rtnl_unlock();
1831 return PTR_ERR(rx_sa);
1832 }
1833
1834 if (rx_sa->active) {
1835 rtnl_unlock();
1836 return -EBUSY;
1837 }
1838
1839 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1840 clear_rx_sa(rx_sa);
1841
1842 rtnl_unlock();
1843
1844 return 0;
1845}
1846
1847static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1848{
1849 struct nlattr **attrs = info->attrs;
1850 struct net_device *dev;
1851 struct macsec_secy *secy;
1852 struct macsec_rx_sc *rx_sc;
1853 sci_t sci;
1854 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1855
1856 if (!attrs[MACSEC_ATTR_IFINDEX])
1857 return -EINVAL;
1858
1859 if (parse_rxsc_config(attrs, tb_rxsc))
1860 return -EINVAL;
1861
1862 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1863 return -EINVAL;
1864
1865 rtnl_lock();
1866 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1867 if (IS_ERR(dev)) {
1868 rtnl_unlock();
1869 return PTR_ERR(dev);
1870 }
1871
1872 secy = &macsec_priv(dev)->secy;
1873 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1874
1875 rx_sc = del_rx_sc(secy, sci);
1876 if (!rx_sc) {
1877 rtnl_unlock();
1878 return -ENODEV;
1879 }
1880
1881 free_rx_sc(rx_sc);
1882 rtnl_unlock();
1883
1884 return 0;
1885}
1886
1887static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1888{
1889 struct nlattr **attrs = info->attrs;
1890 struct net_device *dev;
1891 struct macsec_secy *secy;
1892 struct macsec_tx_sc *tx_sc;
1893 struct macsec_tx_sa *tx_sa;
1894 u8 assoc_num;
1895 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1896
1897 if (!attrs[MACSEC_ATTR_IFINDEX])
1898 return -EINVAL;
1899
1900 if (parse_sa_config(attrs, tb_sa))
1901 return -EINVAL;
1902
1903 rtnl_lock();
1904 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1905 &dev, &secy, &tx_sc, &assoc_num);
1906 if (IS_ERR(tx_sa)) {
1907 rtnl_unlock();
1908 return PTR_ERR(tx_sa);
1909 }
1910
1911 if (tx_sa->active) {
1912 rtnl_unlock();
1913 return -EBUSY;
1914 }
1915
1916 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1917 clear_tx_sa(tx_sa);
1918
1919 rtnl_unlock();
1920
1921 return 0;
1922}
1923
1924static bool validate_upd_sa(struct nlattr **attrs)
1925{
1926 if (!attrs[MACSEC_SA_ATTR_AN] ||
1927 attrs[MACSEC_SA_ATTR_KEY] ||
1928 attrs[MACSEC_SA_ATTR_KEYID])
1929 return false;
1930
1931 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1932 return false;
1933
1934 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1935 return false;
1936
1937 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1938 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1939 return false;
1940 }
1941
1942 return true;
1943}
1944
1945static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
1946{
1947 struct nlattr **attrs = info->attrs;
1948 struct net_device *dev;
1949 struct macsec_secy *secy;
1950 struct macsec_tx_sc *tx_sc;
1951 struct macsec_tx_sa *tx_sa;
1952 u8 assoc_num;
1953 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1954
1955 if (!attrs[MACSEC_ATTR_IFINDEX])
1956 return -EINVAL;
1957
1958 if (parse_sa_config(attrs, tb_sa))
1959 return -EINVAL;
1960
1961 if (!validate_upd_sa(tb_sa))
1962 return -EINVAL;
1963
1964 rtnl_lock();
1965 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1966 &dev, &secy, &tx_sc, &assoc_num);
1967 if (IS_ERR(tx_sa)) {
1968 rtnl_unlock();
1969 return PTR_ERR(tx_sa);
1970 }
1971
1972 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1973 spin_lock_bh(&tx_sa->lock);
1974 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1975 spin_unlock_bh(&tx_sa->lock);
1976 }
1977
1978 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1979 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1980
1981 if (assoc_num == tx_sc->encoding_sa)
1982 secy->operational = tx_sa->active;
1983
1984 rtnl_unlock();
1985
1986 return 0;
1987}
1988
1989static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
1990{
1991 struct nlattr **attrs = info->attrs;
1992 struct net_device *dev;
1993 struct macsec_secy *secy;
1994 struct macsec_rx_sc *rx_sc;
1995 struct macsec_rx_sa *rx_sa;
1996 u8 assoc_num;
1997 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1998 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1999
2000 if (!attrs[MACSEC_ATTR_IFINDEX])
2001 return -EINVAL;
2002
2003 if (parse_rxsc_config(attrs, tb_rxsc))
2004 return -EINVAL;
2005
2006 if (parse_sa_config(attrs, tb_sa))
2007 return -EINVAL;
2008
2009 if (!validate_upd_sa(tb_sa))
2010 return -EINVAL;
2011
2012 rtnl_lock();
2013 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2014 &dev, &secy, &rx_sc, &assoc_num);
2015 if (IS_ERR(rx_sa)) {
2016 rtnl_unlock();
2017 return PTR_ERR(rx_sa);
2018 }
2019
2020 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2021 spin_lock_bh(&rx_sa->lock);
2022 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2023 spin_unlock_bh(&rx_sa->lock);
2024 }
2025
2026 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2027 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2028
2029 rtnl_unlock();
2030 return 0;
2031}
2032
2033static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2034{
2035 struct nlattr **attrs = info->attrs;
2036 struct net_device *dev;
2037 struct macsec_secy *secy;
2038 struct macsec_rx_sc *rx_sc;
2039 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2040
2041 if (!attrs[MACSEC_ATTR_IFINDEX])
2042 return -EINVAL;
2043
2044 if (parse_rxsc_config(attrs, tb_rxsc))
2045 return -EINVAL;
2046
2047 if (!validate_add_rxsc(tb_rxsc))
2048 return -EINVAL;
2049
2050 rtnl_lock();
2051 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2052 if (IS_ERR(rx_sc)) {
2053 rtnl_unlock();
2054 return PTR_ERR(rx_sc);
2055 }
2056
2057 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2058 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2059
2060 if (rx_sc->active != new)
2061 secy->n_rx_sc += new ? 1 : -1;
2062
2063 rx_sc->active = new;
2064 }
2065
2066 rtnl_unlock();
2067
2068 return 0;
2069}
2070
2071static int copy_tx_sa_stats(struct sk_buff *skb,
2072 struct macsec_tx_sa_stats __percpu *pstats)
2073{
2074 struct macsec_tx_sa_stats sum = {0, };
2075 int cpu;
2076
2077 for_each_possible_cpu(cpu) {
2078 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2079
2080 sum.OutPktsProtected += stats->OutPktsProtected;
2081 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2082 }
2083
2084 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2085 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2086 return -EMSGSIZE;
2087
2088 return 0;
2089}
2090
2091static int copy_rx_sa_stats(struct sk_buff *skb,
2092 struct macsec_rx_sa_stats __percpu *pstats)
2093{
2094 struct macsec_rx_sa_stats sum = {0, };
2095 int cpu;
2096
2097 for_each_possible_cpu(cpu) {
2098 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2099
2100 sum.InPktsOK += stats->InPktsOK;
2101 sum.InPktsInvalid += stats->InPktsInvalid;
2102 sum.InPktsNotValid += stats->InPktsNotValid;
2103 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2104 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2105 }
2106
2107 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2108 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2109 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2110 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2111 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2112 return -EMSGSIZE;
2113
2114 return 0;
2115}
2116
2117static int copy_rx_sc_stats(struct sk_buff *skb,
2118 struct pcpu_rx_sc_stats __percpu *pstats)
2119{
2120 struct macsec_rx_sc_stats sum = {0, };
2121 int cpu;
2122
2123 for_each_possible_cpu(cpu) {
2124 const struct pcpu_rx_sc_stats *stats;
2125 struct macsec_rx_sc_stats tmp;
2126 unsigned int start;
2127
2128 stats = per_cpu_ptr(pstats, cpu);
2129 do {
2130 start = u64_stats_fetch_begin_irq(&stats->syncp);
2131 memcpy(&tmp, &stats->stats, sizeof(tmp));
2132 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2133
2134 sum.InOctetsValidated += tmp.InOctetsValidated;
2135 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2136 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2137 sum.InPktsDelayed += tmp.InPktsDelayed;
2138 sum.InPktsOK += tmp.InPktsOK;
2139 sum.InPktsInvalid += tmp.InPktsInvalid;
2140 sum.InPktsLate += tmp.InPktsLate;
2141 sum.InPktsNotValid += tmp.InPktsNotValid;
2142 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2143 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2144 }
2145
2146 if (nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, sum.InOctetsValidated) ||
2147 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, sum.InOctetsDecrypted) ||
2148 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, sum.InPktsUnchecked) ||
2149 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, sum.InPktsDelayed) ||
2150 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2151 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2152 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, sum.InPktsLate) ||
2153 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2154 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2155 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2156 return -EMSGSIZE;
2157
2158 return 0;
2159}
2160
2161static int copy_tx_sc_stats(struct sk_buff *skb,
2162 struct pcpu_tx_sc_stats __percpu *pstats)
2163{
2164 struct macsec_tx_sc_stats sum = {0, };
2165 int cpu;
2166
2167 for_each_possible_cpu(cpu) {
2168 const struct pcpu_tx_sc_stats *stats;
2169 struct macsec_tx_sc_stats tmp;
2170 unsigned int start;
2171
2172 stats = per_cpu_ptr(pstats, cpu);
2173 do {
2174 start = u64_stats_fetch_begin_irq(&stats->syncp);
2175 memcpy(&tmp, &stats->stats, sizeof(tmp));
2176 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2177
2178 sum.OutPktsProtected += tmp.OutPktsProtected;
2179 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2180 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2181 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2182 }
2183
2184 if (nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2185 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted) ||
2186 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, sum.OutOctetsProtected) ||
2187 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, sum.OutOctetsEncrypted))
2188 return -EMSGSIZE;
2189
2190 return 0;
2191}
2192
2193static int copy_secy_stats(struct sk_buff *skb,
2194 struct pcpu_secy_stats __percpu *pstats)
2195{
2196 struct macsec_dev_stats sum = {0, };
2197 int cpu;
2198
2199 for_each_possible_cpu(cpu) {
2200 const struct pcpu_secy_stats *stats;
2201 struct macsec_dev_stats tmp;
2202 unsigned int start;
2203
2204 stats = per_cpu_ptr(pstats, cpu);
2205 do {
2206 start = u64_stats_fetch_begin_irq(&stats->syncp);
2207 memcpy(&tmp, &stats->stats, sizeof(tmp));
2208 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2209
2210 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2211 sum.InPktsUntagged += tmp.InPktsUntagged;
2212 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2213 sum.InPktsNoTag += tmp.InPktsNoTag;
2214 sum.InPktsBadTag += tmp.InPktsBadTag;
2215 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2216 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2217 sum.InPktsOverrun += tmp.InPktsOverrun;
2218 }
2219
2220 if (nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, sum.OutPktsUntagged) ||
2221 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, sum.InPktsUntagged) ||
2222 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, sum.OutPktsTooLong) ||
2223 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, sum.InPktsNoTag) ||
2224 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, sum.InPktsBadTag) ||
2225 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, sum.InPktsUnknownSCI) ||
2226 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, sum.InPktsNoSCI) ||
2227 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, sum.InPktsOverrun))
2228 return -EMSGSIZE;
2229
2230 return 0;
2231}
2232
2233static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2234{
2235 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2236 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2237
2238 if (!secy_nest)
2239 return 1;
2240
2241 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci) ||
2242 nla_put_u64(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2243 MACSEC_DEFAULT_CIPHER_ID) ||
2244 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2245 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2246 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2247 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2248 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2249 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2250 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2251 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2252 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2253 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2254 goto cancel;
2255
2256 if (secy->replay_protect) {
2257 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2258 goto cancel;
2259 }
2260
2261 nla_nest_end(skb, secy_nest);
2262 return 0;
2263
2264cancel:
2265 nla_nest_cancel(skb, secy_nest);
2266 return 1;
2267}
2268
2269static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2270 struct sk_buff *skb, struct netlink_callback *cb)
2271{
2272 struct macsec_rx_sc *rx_sc;
2273 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2274 struct nlattr *txsa_list, *rxsc_list;
2275 int i, j;
2276 void *hdr;
2277 struct nlattr *attr;
2278
2279 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2280 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2281 if (!hdr)
2282 return -EMSGSIZE;
2283
2284 genl_dump_check_consistent(cb, hdr, &macsec_fam);
2285
2286 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2287 goto nla_put_failure;
2288
2289 if (nla_put_secy(secy, skb))
2290 goto nla_put_failure;
2291
2292 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2293 if (!attr)
2294 goto nla_put_failure;
2295 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2296 nla_nest_cancel(skb, attr);
2297 goto nla_put_failure;
2298 }
2299 nla_nest_end(skb, attr);
2300
2301 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2302 if (!attr)
2303 goto nla_put_failure;
2304 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2305 nla_nest_cancel(skb, attr);
2306 goto nla_put_failure;
2307 }
2308 nla_nest_end(skb, attr);
2309
2310 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2311 if (!txsa_list)
2312 goto nla_put_failure;
2313 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2314 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2315 struct nlattr *txsa_nest;
2316
2317 if (!tx_sa)
2318 continue;
2319
2320 txsa_nest = nla_nest_start(skb, j++);
2321 if (!txsa_nest) {
2322 nla_nest_cancel(skb, txsa_list);
2323 goto nla_put_failure;
2324 }
2325
2326 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2327 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2328 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2329 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2330 nla_nest_cancel(skb, txsa_nest);
2331 nla_nest_cancel(skb, txsa_list);
2332 goto nla_put_failure;
2333 }
2334
2335 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2336 if (!attr) {
2337 nla_nest_cancel(skb, txsa_nest);
2338 nla_nest_cancel(skb, txsa_list);
2339 goto nla_put_failure;
2340 }
2341 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2342 nla_nest_cancel(skb, attr);
2343 nla_nest_cancel(skb, txsa_nest);
2344 nla_nest_cancel(skb, txsa_list);
2345 goto nla_put_failure;
2346 }
2347 nla_nest_end(skb, attr);
2348
2349 nla_nest_end(skb, txsa_nest);
2350 }
2351 nla_nest_end(skb, txsa_list);
2352
2353 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2354 if (!rxsc_list)
2355 goto nla_put_failure;
2356
2357 j = 1;
2358 for_each_rxsc_rtnl(secy, rx_sc) {
2359 int k;
2360 struct nlattr *rxsa_list;
2361 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2362
2363 if (!rxsc_nest) {
2364 nla_nest_cancel(skb, rxsc_list);
2365 goto nla_put_failure;
2366 }
2367
2368 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2369 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci)) {
2370 nla_nest_cancel(skb, rxsc_nest);
2371 nla_nest_cancel(skb, rxsc_list);
2372 goto nla_put_failure;
2373 }
2374
2375 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2376 if (!attr) {
2377 nla_nest_cancel(skb, rxsc_nest);
2378 nla_nest_cancel(skb, rxsc_list);
2379 goto nla_put_failure;
2380 }
2381 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2382 nla_nest_cancel(skb, attr);
2383 nla_nest_cancel(skb, rxsc_nest);
2384 nla_nest_cancel(skb, rxsc_list);
2385 goto nla_put_failure;
2386 }
2387 nla_nest_end(skb, attr);
2388
2389 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2390 if (!rxsa_list) {
2391 nla_nest_cancel(skb, rxsc_nest);
2392 nla_nest_cancel(skb, rxsc_list);
2393 goto nla_put_failure;
2394 }
2395
2396 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2397 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2398 struct nlattr *rxsa_nest;
2399
2400 if (!rx_sa)
2401 continue;
2402
2403 rxsa_nest = nla_nest_start(skb, k++);
2404 if (!rxsa_nest) {
2405 nla_nest_cancel(skb, rxsa_list);
2406 nla_nest_cancel(skb, rxsc_nest);
2407 nla_nest_cancel(skb, rxsc_list);
2408 goto nla_put_failure;
2409 }
2410
2411 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2412 if (!attr) {
2413 nla_nest_cancel(skb, rxsa_list);
2414 nla_nest_cancel(skb, rxsc_nest);
2415 nla_nest_cancel(skb, rxsc_list);
2416 goto nla_put_failure;
2417 }
2418 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2419 nla_nest_cancel(skb, attr);
2420 nla_nest_cancel(skb, rxsa_list);
2421 nla_nest_cancel(skb, rxsc_nest);
2422 nla_nest_cancel(skb, rxsc_list);
2423 goto nla_put_failure;
2424 }
2425 nla_nest_end(skb, attr);
2426
2427 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2428 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2429 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2430 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2431 nla_nest_cancel(skb, rxsa_nest);
2432 nla_nest_cancel(skb, rxsc_nest);
2433 nla_nest_cancel(skb, rxsc_list);
2434 goto nla_put_failure;
2435 }
2436 nla_nest_end(skb, rxsa_nest);
2437 }
2438
2439 nla_nest_end(skb, rxsa_list);
2440 nla_nest_end(skb, rxsc_nest);
2441 }
2442
2443 nla_nest_end(skb, rxsc_list);
2444
2445 genlmsg_end(skb, hdr);
2446
2447 return 0;
2448
2449nla_put_failure:
2450 genlmsg_cancel(skb, hdr);
2451 return -EMSGSIZE;
2452}
2453
2454static int macsec_generation = 1; /* protected by RTNL */
2455
2456static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2457{
2458 struct net *net = sock_net(skb->sk);
2459 struct net_device *dev;
2460 int dev_idx, d;
2461
2462 dev_idx = cb->args[0];
2463
2464 d = 0;
2465 rtnl_lock();
2466
2467 cb->seq = macsec_generation;
2468
2469 for_each_netdev(net, dev) {
2470 struct macsec_secy *secy;
2471
2472 if (d < dev_idx)
2473 goto next;
2474
2475 if (!netif_is_macsec(dev))
2476 goto next;
2477
2478 secy = &macsec_priv(dev)->secy;
2479 if (dump_secy(secy, dev, skb, cb) < 0)
2480 goto done;
2481next:
2482 d++;
2483 }
2484
2485done:
2486 rtnl_unlock();
2487 cb->args[0] = d;
2488 return skb->len;
2489}
2490
2491static const struct genl_ops macsec_genl_ops[] = {
2492 {
2493 .cmd = MACSEC_CMD_GET_TXSC,
2494 .dumpit = macsec_dump_txsc,
2495 .policy = macsec_genl_policy,
2496 },
2497 {
2498 .cmd = MACSEC_CMD_ADD_RXSC,
2499 .doit = macsec_add_rxsc,
2500 .policy = macsec_genl_policy,
2501 .flags = GENL_ADMIN_PERM,
2502 },
2503 {
2504 .cmd = MACSEC_CMD_DEL_RXSC,
2505 .doit = macsec_del_rxsc,
2506 .policy = macsec_genl_policy,
2507 .flags = GENL_ADMIN_PERM,
2508 },
2509 {
2510 .cmd = MACSEC_CMD_UPD_RXSC,
2511 .doit = macsec_upd_rxsc,
2512 .policy = macsec_genl_policy,
2513 .flags = GENL_ADMIN_PERM,
2514 },
2515 {
2516 .cmd = MACSEC_CMD_ADD_TXSA,
2517 .doit = macsec_add_txsa,
2518 .policy = macsec_genl_policy,
2519 .flags = GENL_ADMIN_PERM,
2520 },
2521 {
2522 .cmd = MACSEC_CMD_DEL_TXSA,
2523 .doit = macsec_del_txsa,
2524 .policy = macsec_genl_policy,
2525 .flags = GENL_ADMIN_PERM,
2526 },
2527 {
2528 .cmd = MACSEC_CMD_UPD_TXSA,
2529 .doit = macsec_upd_txsa,
2530 .policy = macsec_genl_policy,
2531 .flags = GENL_ADMIN_PERM,
2532 },
2533 {
2534 .cmd = MACSEC_CMD_ADD_RXSA,
2535 .doit = macsec_add_rxsa,
2536 .policy = macsec_genl_policy,
2537 .flags = GENL_ADMIN_PERM,
2538 },
2539 {
2540 .cmd = MACSEC_CMD_DEL_RXSA,
2541 .doit = macsec_del_rxsa,
2542 .policy = macsec_genl_policy,
2543 .flags = GENL_ADMIN_PERM,
2544 },
2545 {
2546 .cmd = MACSEC_CMD_UPD_RXSA,
2547 .doit = macsec_upd_rxsa,
2548 .policy = macsec_genl_policy,
2549 .flags = GENL_ADMIN_PERM,
2550 },
2551};
2552
2553static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2554 struct net_device *dev)
2555{
2556 struct macsec_dev *macsec = netdev_priv(dev);
2557 struct macsec_secy *secy = &macsec->secy;
2558 struct pcpu_secy_stats *secy_stats;
2559 int ret, len;
2560
2561 /* 10.5 */
2562 if (!secy->protect_frames) {
2563 secy_stats = this_cpu_ptr(macsec->stats);
2564 u64_stats_update_begin(&secy_stats->syncp);
2565 secy_stats->stats.OutPktsUntagged++;
2566 u64_stats_update_end(&secy_stats->syncp);
2567 len = skb->len;
2568 ret = dev_queue_xmit(skb);
2569 count_tx(dev, ret, len);
2570 return ret;
2571 }
2572
2573 if (!secy->operational) {
2574 kfree_skb(skb);
2575 dev->stats.tx_dropped++;
2576 return NETDEV_TX_OK;
2577 }
2578
2579 skb = macsec_encrypt(skb, dev);
2580 if (IS_ERR(skb)) {
2581 if (PTR_ERR(skb) != -EINPROGRESS)
2582 dev->stats.tx_dropped++;
2583 return NETDEV_TX_OK;
2584 }
2585
2586 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2587
2588 macsec_encrypt_finish(skb, dev);
2589 len = skb->len;
2590 ret = dev_queue_xmit(skb);
2591 count_tx(dev, ret, len);
2592 return ret;
2593}
2594
2595#define MACSEC_FEATURES \
2596 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2597static int macsec_dev_init(struct net_device *dev)
2598{
2599 struct macsec_dev *macsec = macsec_priv(dev);
2600 struct net_device *real_dev = macsec->real_dev;
2601
2602 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2603 if (!dev->tstats)
2604 return -ENOMEM;
2605
2606 dev->features = real_dev->features & MACSEC_FEATURES;
2607 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2608
2609 dev->needed_headroom = real_dev->needed_headroom +
2610 MACSEC_NEEDED_HEADROOM;
2611 dev->needed_tailroom = real_dev->needed_tailroom +
2612 MACSEC_NEEDED_TAILROOM;
2613
2614 if (is_zero_ether_addr(dev->dev_addr))
2615 eth_hw_addr_inherit(dev, real_dev);
2616 if (is_zero_ether_addr(dev->broadcast))
2617 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2618
2619 return 0;
2620}
2621
2622static void macsec_dev_uninit(struct net_device *dev)
2623{
2624 free_percpu(dev->tstats);
2625}
2626
2627static netdev_features_t macsec_fix_features(struct net_device *dev,
2628 netdev_features_t features)
2629{
2630 struct macsec_dev *macsec = macsec_priv(dev);
2631 struct net_device *real_dev = macsec->real_dev;
2632
2633 features &= real_dev->features & MACSEC_FEATURES;
2634 features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2635
2636 return features;
2637}
2638
2639static int macsec_dev_open(struct net_device *dev)
2640{
2641 struct macsec_dev *macsec = macsec_priv(dev);
2642 struct net_device *real_dev = macsec->real_dev;
2643 int err;
2644
2645 if (!(real_dev->flags & IFF_UP))
2646 return -ENETDOWN;
2647
2648 err = dev_uc_add(real_dev, dev->dev_addr);
2649 if (err < 0)
2650 return err;
2651
2652 if (dev->flags & IFF_ALLMULTI) {
2653 err = dev_set_allmulti(real_dev, 1);
2654 if (err < 0)
2655 goto del_unicast;
2656 }
2657
2658 if (dev->flags & IFF_PROMISC) {
2659 err = dev_set_promiscuity(real_dev, 1);
2660 if (err < 0)
2661 goto clear_allmulti;
2662 }
2663
2664 if (netif_carrier_ok(real_dev))
2665 netif_carrier_on(dev);
2666
2667 return 0;
2668clear_allmulti:
2669 if (dev->flags & IFF_ALLMULTI)
2670 dev_set_allmulti(real_dev, -1);
2671del_unicast:
2672 dev_uc_del(real_dev, dev->dev_addr);
2673 netif_carrier_off(dev);
2674 return err;
2675}
2676
2677static int macsec_dev_stop(struct net_device *dev)
2678{
2679 struct macsec_dev *macsec = macsec_priv(dev);
2680 struct net_device *real_dev = macsec->real_dev;
2681
2682 netif_carrier_off(dev);
2683
2684 dev_mc_unsync(real_dev, dev);
2685 dev_uc_unsync(real_dev, dev);
2686
2687 if (dev->flags & IFF_ALLMULTI)
2688 dev_set_allmulti(real_dev, -1);
2689
2690 if (dev->flags & IFF_PROMISC)
2691 dev_set_promiscuity(real_dev, -1);
2692
2693 dev_uc_del(real_dev, dev->dev_addr);
2694
2695 return 0;
2696}
2697
2698static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2699{
2700 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2701
2702 if (!(dev->flags & IFF_UP))
2703 return;
2704
2705 if (change & IFF_ALLMULTI)
2706 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2707
2708 if (change & IFF_PROMISC)
2709 dev_set_promiscuity(real_dev,
2710 dev->flags & IFF_PROMISC ? 1 : -1);
2711}
2712
2713static void macsec_dev_set_rx_mode(struct net_device *dev)
2714{
2715 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2716
2717 dev_mc_sync(real_dev, dev);
2718 dev_uc_sync(real_dev, dev);
2719}
2720
2721static int macsec_set_mac_address(struct net_device *dev, void *p)
2722{
2723 struct macsec_dev *macsec = macsec_priv(dev);
2724 struct net_device *real_dev = macsec->real_dev;
2725 struct sockaddr *addr = p;
2726 int err;
2727
2728 if (!is_valid_ether_addr(addr->sa_data))
2729 return -EADDRNOTAVAIL;
2730
2731 if (!(dev->flags & IFF_UP))
2732 goto out;
2733
2734 err = dev_uc_add(real_dev, addr->sa_data);
2735 if (err < 0)
2736 return err;
2737
2738 dev_uc_del(real_dev, dev->dev_addr);
2739
2740out:
2741 ether_addr_copy(dev->dev_addr, addr->sa_data);
2742 return 0;
2743}
2744
2745static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2746{
2747 struct macsec_dev *macsec = macsec_priv(dev);
2748 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2749
2750 if (macsec->real_dev->mtu - extra < new_mtu)
2751 return -ERANGE;
2752
2753 dev->mtu = new_mtu;
2754
2755 return 0;
2756}
2757
2758static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2759 struct rtnl_link_stats64 *s)
2760{
2761 int cpu;
2762
2763 if (!dev->tstats)
2764 return s;
2765
2766 for_each_possible_cpu(cpu) {
2767 struct pcpu_sw_netstats *stats;
2768 struct pcpu_sw_netstats tmp;
2769 int start;
2770
2771 stats = per_cpu_ptr(dev->tstats, cpu);
2772 do {
2773 start = u64_stats_fetch_begin_irq(&stats->syncp);
2774 tmp.rx_packets = stats->rx_packets;
2775 tmp.rx_bytes = stats->rx_bytes;
2776 tmp.tx_packets = stats->tx_packets;
2777 tmp.tx_bytes = stats->tx_bytes;
2778 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2779
2780 s->rx_packets += tmp.rx_packets;
2781 s->rx_bytes += tmp.rx_bytes;
2782 s->tx_packets += tmp.tx_packets;
2783 s->tx_bytes += tmp.tx_bytes;
2784 }
2785
2786 s->rx_dropped = dev->stats.rx_dropped;
2787 s->tx_dropped = dev->stats.tx_dropped;
2788
2789 return s;
2790}
2791
2792static int macsec_get_iflink(const struct net_device *dev)
2793{
2794 return macsec_priv(dev)->real_dev->ifindex;
2795}
2796
2797static const struct net_device_ops macsec_netdev_ops = {
2798 .ndo_init = macsec_dev_init,
2799 .ndo_uninit = macsec_dev_uninit,
2800 .ndo_open = macsec_dev_open,
2801 .ndo_stop = macsec_dev_stop,
2802 .ndo_fix_features = macsec_fix_features,
2803 .ndo_change_mtu = macsec_change_mtu,
2804 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2805 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2806 .ndo_set_mac_address = macsec_set_mac_address,
2807 .ndo_start_xmit = macsec_start_xmit,
2808 .ndo_get_stats64 = macsec_get_stats64,
2809 .ndo_get_iflink = macsec_get_iflink,
2810};
2811
2812static const struct device_type macsec_type = {
2813 .name = "macsec",
2814};
2815
2816static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2817 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2818 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2819 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2820 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2821 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2822 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2823 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2824 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2825 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2826 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2827 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2828 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2829};
2830
2831static void macsec_free_netdev(struct net_device *dev)
2832{
2833 struct macsec_dev *macsec = macsec_priv(dev);
2834 struct net_device *real_dev = macsec->real_dev;
2835
2836 free_percpu(macsec->stats);
2837 free_percpu(macsec->secy.tx_sc.stats);
2838
2839 dev_put(real_dev);
2840 free_netdev(dev);
2841}
2842
2843static void macsec_setup(struct net_device *dev)
2844{
2845 ether_setup(dev);
2846 dev->tx_queue_len = 0;
2847 dev->netdev_ops = &macsec_netdev_ops;
2848 dev->destructor = macsec_free_netdev;
2849
2850 eth_zero_addr(dev->broadcast);
2851}
2852
2853static void macsec_changelink_common(struct net_device *dev,
2854 struct nlattr *data[])
2855{
2856 struct macsec_secy *secy;
2857 struct macsec_tx_sc *tx_sc;
2858
2859 secy = &macsec_priv(dev)->secy;
2860 tx_sc = &secy->tx_sc;
2861
2862 if (data[IFLA_MACSEC_ENCODING_SA]) {
2863 struct macsec_tx_sa *tx_sa;
2864
2865 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
2866 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
2867
2868 secy->operational = tx_sa && tx_sa->active;
2869 }
2870
2871 if (data[IFLA_MACSEC_WINDOW])
2872 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
2873
2874 if (data[IFLA_MACSEC_ENCRYPT])
2875 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
2876
2877 if (data[IFLA_MACSEC_PROTECT])
2878 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
2879
2880 if (data[IFLA_MACSEC_INC_SCI])
2881 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
2882
2883 if (data[IFLA_MACSEC_ES])
2884 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
2885
2886 if (data[IFLA_MACSEC_SCB])
2887 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
2888
2889 if (data[IFLA_MACSEC_REPLAY_PROTECT])
2890 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
2891
2892 if (data[IFLA_MACSEC_VALIDATION])
2893 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
2894}
2895
2896static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
2897 struct nlattr *data[])
2898{
2899 if (!data)
2900 return 0;
2901
2902 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
2903 data[IFLA_MACSEC_ICV_LEN] ||
2904 data[IFLA_MACSEC_SCI] ||
2905 data[IFLA_MACSEC_PORT])
2906 return -EINVAL;
2907
2908 macsec_changelink_common(dev, data);
2909
2910 return 0;
2911}
2912
2913static void macsec_del_dev(struct macsec_dev *macsec)
2914{
2915 int i;
2916
2917 while (macsec->secy.rx_sc) {
2918 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
2919
2920 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
2921 free_rx_sc(rx_sc);
2922 }
2923
2924 for (i = 0; i < MACSEC_NUM_AN; i++) {
2925 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
2926
2927 if (sa) {
2928 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
2929 clear_tx_sa(sa);
2930 }
2931 }
2932}
2933
2934static void macsec_dellink(struct net_device *dev, struct list_head *head)
2935{
2936 struct macsec_dev *macsec = macsec_priv(dev);
2937 struct net_device *real_dev = macsec->real_dev;
2938 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2939
2940 macsec_generation++;
2941
2942 unregister_netdevice_queue(dev, head);
2943 list_del_rcu(&macsec->secys);
2944 if (list_empty(&rxd->secys)) {
2945 netdev_rx_handler_unregister(real_dev);
2946 kfree(rxd);
2947 }
2948
2949 macsec_del_dev(macsec);
2950}
2951
2952static int register_macsec_dev(struct net_device *real_dev,
2953 struct net_device *dev)
2954{
2955 struct macsec_dev *macsec = macsec_priv(dev);
2956 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2957
2958 if (!rxd) {
2959 int err;
2960
2961 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
2962 if (!rxd)
2963 return -ENOMEM;
2964
2965 INIT_LIST_HEAD(&rxd->secys);
2966
2967 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
2968 rxd);
2969 if (err < 0) {
2970 kfree(rxd);
2971 return err;
2972 }
2973 }
2974
2975 list_add_tail_rcu(&macsec->secys, &rxd->secys);
2976 return 0;
2977}
2978
2979static bool sci_exists(struct net_device *dev, sci_t sci)
2980{
2981 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
2982 struct macsec_dev *macsec;
2983
2984 list_for_each_entry(macsec, &rxd->secys, secys) {
2985 if (macsec->secy.sci == sci)
2986 return true;
2987 }
2988
2989 return false;
2990}
2991
2992static sci_t dev_to_sci(struct net_device *dev, __be16 port)
2993{
2994 return make_sci(dev->dev_addr, port);
2995}
2996
2997static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
2998{
2999 struct macsec_dev *macsec = macsec_priv(dev);
3000 struct macsec_secy *secy = &macsec->secy;
3001
3002 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3003 if (!macsec->stats)
3004 return -ENOMEM;
3005
3006 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3007 if (!secy->tx_sc.stats) {
3008 free_percpu(macsec->stats);
3009 return -ENOMEM;
3010 }
3011
3012 if (sci == MACSEC_UNDEF_SCI)
3013 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3014
3015 secy->netdev = dev;
3016 secy->operational = true;
3017 secy->key_len = DEFAULT_SAK_LEN;
3018 secy->icv_len = icv_len;
3019 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3020 secy->protect_frames = true;
3021 secy->replay_protect = false;
3022
3023 secy->sci = sci;
3024 secy->tx_sc.active = true;
3025 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3026 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3027 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3028 secy->tx_sc.end_station = false;
3029 secy->tx_sc.scb = false;
3030
3031 return 0;
3032}
3033
3034static int macsec_newlink(struct net *net, struct net_device *dev,
3035 struct nlattr *tb[], struct nlattr *data[])
3036{
3037 struct macsec_dev *macsec = macsec_priv(dev);
3038 struct net_device *real_dev;
3039 int err;
3040 sci_t sci;
3041 u8 icv_len = DEFAULT_ICV_LEN;
3042 rx_handler_func_t *rx_handler;
3043
3044 if (!tb[IFLA_LINK])
3045 return -EINVAL;
3046 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3047 if (!real_dev)
3048 return -ENODEV;
3049
3050 dev->priv_flags |= IFF_MACSEC;
3051
3052 macsec->real_dev = real_dev;
3053
3054 if (data && data[IFLA_MACSEC_ICV_LEN])
3055 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3056 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3057
3058 rx_handler = rtnl_dereference(real_dev->rx_handler);
3059 if (rx_handler && rx_handler != macsec_handle_frame)
3060 return -EBUSY;
3061
3062 err = register_netdevice(dev);
3063 if (err < 0)
3064 return err;
3065
3066 /* need to be already registered so that ->init has run and
3067 * the MAC addr is set
3068 */
3069 if (data && data[IFLA_MACSEC_SCI])
3070 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3071 else if (data && data[IFLA_MACSEC_PORT])
3072 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3073 else
3074 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3075
3076 if (rx_handler && sci_exists(real_dev, sci)) {
3077 err = -EBUSY;
3078 goto unregister;
3079 }
3080
3081 err = macsec_add_dev(dev, sci, icv_len);
3082 if (err)
3083 goto unregister;
3084
3085 if (data)
3086 macsec_changelink_common(dev, data);
3087
3088 err = register_macsec_dev(real_dev, dev);
3089 if (err < 0)
3090 goto del_dev;
3091
3092 macsec_generation++;
3093
3094 dev_hold(real_dev);
3095
3096 return 0;
3097
3098del_dev:
3099 macsec_del_dev(macsec);
3100unregister:
3101 unregister_netdevice(dev);
3102 return err;
3103}
3104
3105static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3106{
3107 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3108 u8 icv_len = DEFAULT_ICV_LEN;
3109 int flag;
3110 bool es, scb, sci;
3111
3112 if (!data)
3113 return 0;
3114
3115 if (data[IFLA_MACSEC_CIPHER_SUITE])
3116 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3117
3118 if (data[IFLA_MACSEC_ICV_LEN])
3119 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3120
3121 switch (csid) {
3122 case MACSEC_DEFAULT_CIPHER_ID:
3123 case MACSEC_DEFAULT_CIPHER_ALT:
3124 if (icv_len < MACSEC_MIN_ICV_LEN ||
3125 icv_len > MACSEC_MAX_ICV_LEN)
3126 return -EINVAL;
3127 break;
3128 default:
3129 return -EINVAL;
3130 }
3131
3132 if (data[IFLA_MACSEC_ENCODING_SA]) {
3133 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3134 return -EINVAL;
3135 }
3136
3137 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3138 flag < IFLA_MACSEC_VALIDATION;
3139 flag++) {
3140 if (data[flag]) {
3141 if (nla_get_u8(data[flag]) > 1)
3142 return -EINVAL;
3143 }
3144 }
3145
3146 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3147 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3148 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3149
3150 if ((sci && (scb || es)) || (scb && es))
3151 return -EINVAL;
3152
3153 if (data[IFLA_MACSEC_VALIDATION] &&
3154 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3155 return -EINVAL;
3156
3157 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3158 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3159 !data[IFLA_MACSEC_WINDOW])
3160 return -EINVAL;
3161
3162 return 0;
3163}
3164
3165static struct net *macsec_get_link_net(const struct net_device *dev)
3166{
3167 return dev_net(macsec_priv(dev)->real_dev);
3168}
3169
3170static size_t macsec_get_size(const struct net_device *dev)
3171{
3172 return 0 +
3173 nla_total_size(8) + /* SCI */
3174 nla_total_size(1) + /* ICV_LEN */
3175 nla_total_size(8) + /* CIPHER_SUITE */
3176 nla_total_size(4) + /* WINDOW */
3177 nla_total_size(1) + /* ENCODING_SA */
3178 nla_total_size(1) + /* ENCRYPT */
3179 nla_total_size(1) + /* PROTECT */
3180 nla_total_size(1) + /* INC_SCI */
3181 nla_total_size(1) + /* ES */
3182 nla_total_size(1) + /* SCB */
3183 nla_total_size(1) + /* REPLAY_PROTECT */
3184 nla_total_size(1) + /* VALIDATION */
3185 0;
3186}
3187
3188static int macsec_fill_info(struct sk_buff *skb,
3189 const struct net_device *dev)
3190{
3191 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3192 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3193
3194 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci) ||
3195 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3196 nla_put_u64(skb, IFLA_MACSEC_CIPHER_SUITE,
3197 MACSEC_DEFAULT_CIPHER_ID) ||
3198 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3199 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3200 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3201 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3202 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3203 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3204 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3205 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3206 0)
3207 goto nla_put_failure;
3208
3209 if (secy->replay_protect) {
3210 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3211 goto nla_put_failure;
3212 }
3213
3214 return 0;
3215
3216nla_put_failure:
3217 return -EMSGSIZE;
3218}
3219
3220static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3221 .kind = "macsec",
3222 .priv_size = sizeof(struct macsec_dev),
3223 .maxtype = IFLA_MACSEC_MAX,
3224 .policy = macsec_rtnl_policy,
3225 .setup = macsec_setup,
3226 .validate = macsec_validate_attr,
3227 .newlink = macsec_newlink,
3228 .changelink = macsec_changelink,
3229 .dellink = macsec_dellink,
3230 .get_size = macsec_get_size,
3231 .fill_info = macsec_fill_info,
3232 .get_link_net = macsec_get_link_net,
3233};
3234
3235static bool is_macsec_master(struct net_device *dev)
3236{
3237 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3238}
3239
3240static int macsec_notify(struct notifier_block *this, unsigned long event,
3241 void *ptr)
3242{
3243 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3244 LIST_HEAD(head);
3245
3246 if (!is_macsec_master(real_dev))
3247 return NOTIFY_DONE;
3248
3249 switch (event) {
3250 case NETDEV_UNREGISTER: {
3251 struct macsec_dev *m, *n;
3252 struct macsec_rxh_data *rxd;
3253
3254 rxd = macsec_data_rtnl(real_dev);
3255 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3256 macsec_dellink(m->secy.netdev, &head);
3257 }
3258 unregister_netdevice_many(&head);
3259 break;
3260 }
3261 case NETDEV_CHANGEMTU: {
3262 struct macsec_dev *m;
3263 struct macsec_rxh_data *rxd;
3264
3265 rxd = macsec_data_rtnl(real_dev);
3266 list_for_each_entry(m, &rxd->secys, secys) {
3267 struct net_device *dev = m->secy.netdev;
3268 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3269 macsec_extra_len(true));
3270
3271 if (dev->mtu > mtu)
3272 dev_set_mtu(dev, mtu);
3273 }
3274 }
3275 }
3276
3277 return NOTIFY_OK;
3278}
3279
3280static struct notifier_block macsec_notifier = {
3281 .notifier_call = macsec_notify,
3282};
3283
3284static int __init macsec_init(void)
3285{
3286 int err;
3287
3288 pr_info("MACsec IEEE 802.1AE\n");
3289 err = register_netdevice_notifier(&macsec_notifier);
3290 if (err)
3291 return err;
3292
3293 err = rtnl_link_register(&macsec_link_ops);
3294 if (err)
3295 goto notifier;
3296
3297 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops);
3298 if (err)
3299 goto rtnl;
3300
3301 return 0;
3302
3303rtnl:
3304 rtnl_link_unregister(&macsec_link_ops);
3305notifier:
3306 unregister_netdevice_notifier(&macsec_notifier);
3307 return err;
3308}
3309
3310static void __exit macsec_exit(void)
3311{
3312 genl_unregister_family(&macsec_fam);
3313 rtnl_link_unregister(&macsec_link_ops);
3314 unregister_netdevice_notifier(&macsec_notifier);
3315}
3316
3317module_init(macsec_init);
3318module_exit(macsec_exit);
3319
3320MODULE_ALIAS_RTNL_LINK("macsec");
3321
3322MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3323MODULE_LICENSE("GPL v2");