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1/*
2 * drivers/net/macsec.c - MACsec device
3 *
4 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/types.h>
13#include <linux/skbuff.h>
14#include <linux/socket.h>
15#include <linux/module.h>
16#include <crypto/aead.h>
17#include <linux/etherdevice.h>
18#include <linux/rtnetlink.h>
19#include <linux/refcount.h>
20#include <net/genetlink.h>
21#include <net/sock.h>
22#include <net/gro_cells.h>
23
24#include <uapi/linux/if_macsec.h>
25
26typedef u64 __bitwise sci_t;
27
28#define MACSEC_SCI_LEN 8
29
30/* SecTAG length = macsec_eth_header without the optional SCI */
31#define MACSEC_TAG_LEN 6
32
33struct macsec_eth_header {
34 struct ethhdr eth;
35 /* SecTAG */
36 u8 tci_an;
37#if defined(__LITTLE_ENDIAN_BITFIELD)
38 u8 short_length:6,
39 unused:2;
40#elif defined(__BIG_ENDIAN_BITFIELD)
41 u8 unused:2,
42 short_length:6;
43#else
44#error "Please fix <asm/byteorder.h>"
45#endif
46 __be32 packet_number;
47 u8 secure_channel_id[8]; /* optional */
48} __packed;
49
50#define MACSEC_TCI_VERSION 0x80
51#define MACSEC_TCI_ES 0x40 /* end station */
52#define MACSEC_TCI_SC 0x20 /* SCI present */
53#define MACSEC_TCI_SCB 0x10 /* epon */
54#define MACSEC_TCI_E 0x08 /* encryption */
55#define MACSEC_TCI_C 0x04 /* changed text */
56#define MACSEC_AN_MASK 0x03 /* association number */
57#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
58
59/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
60#define MIN_NON_SHORT_LEN 48
61
62#define GCM_AES_IV_LEN 12
63#define DEFAULT_ICV_LEN 16
64
65#define MACSEC_NUM_AN 4 /* 2 bits for the association number */
66
67#define for_each_rxsc(secy, sc) \
68 for (sc = rcu_dereference_bh(secy->rx_sc); \
69 sc; \
70 sc = rcu_dereference_bh(sc->next))
71#define for_each_rxsc_rtnl(secy, sc) \
72 for (sc = rtnl_dereference(secy->rx_sc); \
73 sc; \
74 sc = rtnl_dereference(sc->next))
75
76struct gcm_iv {
77 union {
78 u8 secure_channel_id[8];
79 sci_t sci;
80 };
81 __be32 pn;
82};
83
84/**
85 * struct macsec_key - SA key
86 * @id: user-provided key identifier
87 * @tfm: crypto struct, key storage
88 */
89struct macsec_key {
90 u8 id[MACSEC_KEYID_LEN];
91 struct crypto_aead *tfm;
92};
93
94struct macsec_rx_sc_stats {
95 __u64 InOctetsValidated;
96 __u64 InOctetsDecrypted;
97 __u64 InPktsUnchecked;
98 __u64 InPktsDelayed;
99 __u64 InPktsOK;
100 __u64 InPktsInvalid;
101 __u64 InPktsLate;
102 __u64 InPktsNotValid;
103 __u64 InPktsNotUsingSA;
104 __u64 InPktsUnusedSA;
105};
106
107struct macsec_rx_sa_stats {
108 __u32 InPktsOK;
109 __u32 InPktsInvalid;
110 __u32 InPktsNotValid;
111 __u32 InPktsNotUsingSA;
112 __u32 InPktsUnusedSA;
113};
114
115struct macsec_tx_sa_stats {
116 __u32 OutPktsProtected;
117 __u32 OutPktsEncrypted;
118};
119
120struct macsec_tx_sc_stats {
121 __u64 OutPktsProtected;
122 __u64 OutPktsEncrypted;
123 __u64 OutOctetsProtected;
124 __u64 OutOctetsEncrypted;
125};
126
127struct macsec_dev_stats {
128 __u64 OutPktsUntagged;
129 __u64 InPktsUntagged;
130 __u64 OutPktsTooLong;
131 __u64 InPktsNoTag;
132 __u64 InPktsBadTag;
133 __u64 InPktsUnknownSCI;
134 __u64 InPktsNoSCI;
135 __u64 InPktsOverrun;
136};
137
138/**
139 * struct macsec_rx_sa - receive secure association
140 * @active:
141 * @next_pn: packet number expected for the next packet
142 * @lock: protects next_pn manipulations
143 * @key: key structure
144 * @stats: per-SA stats
145 */
146struct macsec_rx_sa {
147 struct macsec_key key;
148 spinlock_t lock;
149 u32 next_pn;
150 refcount_t refcnt;
151 bool active;
152 struct macsec_rx_sa_stats __percpu *stats;
153 struct macsec_rx_sc *sc;
154 struct rcu_head rcu;
155};
156
157struct pcpu_rx_sc_stats {
158 struct macsec_rx_sc_stats stats;
159 struct u64_stats_sync syncp;
160};
161
162/**
163 * struct macsec_rx_sc - receive secure channel
164 * @sci: secure channel identifier for this SC
165 * @active: channel is active
166 * @sa: array of secure associations
167 * @stats: per-SC stats
168 */
169struct macsec_rx_sc {
170 struct macsec_rx_sc __rcu *next;
171 sci_t sci;
172 bool active;
173 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
174 struct pcpu_rx_sc_stats __percpu *stats;
175 refcount_t refcnt;
176 struct rcu_head rcu_head;
177};
178
179/**
180 * struct macsec_tx_sa - transmit secure association
181 * @active:
182 * @next_pn: packet number to use for the next packet
183 * @lock: protects next_pn manipulations
184 * @key: key structure
185 * @stats: per-SA stats
186 */
187struct macsec_tx_sa {
188 struct macsec_key key;
189 spinlock_t lock;
190 u32 next_pn;
191 refcount_t refcnt;
192 bool active;
193 struct macsec_tx_sa_stats __percpu *stats;
194 struct rcu_head rcu;
195};
196
197struct pcpu_tx_sc_stats {
198 struct macsec_tx_sc_stats stats;
199 struct u64_stats_sync syncp;
200};
201
202/**
203 * struct macsec_tx_sc - transmit secure channel
204 * @active:
205 * @encoding_sa: association number of the SA currently in use
206 * @encrypt: encrypt packets on transmit, or authenticate only
207 * @send_sci: always include the SCI in the SecTAG
208 * @end_station:
209 * @scb: single copy broadcast flag
210 * @sa: array of secure associations
211 * @stats: stats for this TXSC
212 */
213struct macsec_tx_sc {
214 bool active;
215 u8 encoding_sa;
216 bool encrypt;
217 bool send_sci;
218 bool end_station;
219 bool scb;
220 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
221 struct pcpu_tx_sc_stats __percpu *stats;
222};
223
224#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
225
226/**
227 * struct macsec_secy - MACsec Security Entity
228 * @netdev: netdevice for this SecY
229 * @n_rx_sc: number of receive secure channels configured on this SecY
230 * @sci: secure channel identifier used for tx
231 * @key_len: length of keys used by the cipher suite
232 * @icv_len: length of ICV used by the cipher suite
233 * @validate_frames: validation mode
234 * @operational: MAC_Operational flag
235 * @protect_frames: enable protection for this SecY
236 * @replay_protect: enable packet number checks on receive
237 * @replay_window: size of the replay window
238 * @tx_sc: transmit secure channel
239 * @rx_sc: linked list of receive secure channels
240 */
241struct macsec_secy {
242 struct net_device *netdev;
243 unsigned int n_rx_sc;
244 sci_t sci;
245 u16 key_len;
246 u16 icv_len;
247 enum macsec_validation_type validate_frames;
248 bool operational;
249 bool protect_frames;
250 bool replay_protect;
251 u32 replay_window;
252 struct macsec_tx_sc tx_sc;
253 struct macsec_rx_sc __rcu *rx_sc;
254};
255
256struct pcpu_secy_stats {
257 struct macsec_dev_stats stats;
258 struct u64_stats_sync syncp;
259};
260
261/**
262 * struct macsec_dev - private data
263 * @secy: SecY config
264 * @real_dev: pointer to underlying netdevice
265 * @stats: MACsec device stats
266 * @secys: linked list of SecY's on the underlying device
267 */
268struct macsec_dev {
269 struct macsec_secy secy;
270 struct net_device *real_dev;
271 struct pcpu_secy_stats __percpu *stats;
272 struct list_head secys;
273 struct gro_cells gro_cells;
274 unsigned int nest_level;
275};
276
277/**
278 * struct macsec_rxh_data - rx_handler private argument
279 * @secys: linked list of SecY's on this underlying device
280 */
281struct macsec_rxh_data {
282 struct list_head secys;
283};
284
285static struct macsec_dev *macsec_priv(const struct net_device *dev)
286{
287 return (struct macsec_dev *)netdev_priv(dev);
288}
289
290static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
291{
292 return rcu_dereference_bh(dev->rx_handler_data);
293}
294
295static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
296{
297 return rtnl_dereference(dev->rx_handler_data);
298}
299
300struct macsec_cb {
301 struct aead_request *req;
302 union {
303 struct macsec_tx_sa *tx_sa;
304 struct macsec_rx_sa *rx_sa;
305 };
306 u8 assoc_num;
307 bool valid;
308 bool has_sci;
309};
310
311static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
312{
313 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
314
315 if (!sa || !sa->active)
316 return NULL;
317
318 if (!refcount_inc_not_zero(&sa->refcnt))
319 return NULL;
320
321 return sa;
322}
323
324static void free_rx_sc_rcu(struct rcu_head *head)
325{
326 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
327
328 free_percpu(rx_sc->stats);
329 kfree(rx_sc);
330}
331
332static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
333{
334 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
335}
336
337static void macsec_rxsc_put(struct macsec_rx_sc *sc)
338{
339 if (refcount_dec_and_test(&sc->refcnt))
340 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
341}
342
343static void free_rxsa(struct rcu_head *head)
344{
345 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
346
347 crypto_free_aead(sa->key.tfm);
348 free_percpu(sa->stats);
349 kfree(sa);
350}
351
352static void macsec_rxsa_put(struct macsec_rx_sa *sa)
353{
354 if (refcount_dec_and_test(&sa->refcnt))
355 call_rcu(&sa->rcu, free_rxsa);
356}
357
358static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
359{
360 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
361
362 if (!sa || !sa->active)
363 return NULL;
364
365 if (!refcount_inc_not_zero(&sa->refcnt))
366 return NULL;
367
368 return sa;
369}
370
371static void free_txsa(struct rcu_head *head)
372{
373 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
374
375 crypto_free_aead(sa->key.tfm);
376 free_percpu(sa->stats);
377 kfree(sa);
378}
379
380static void macsec_txsa_put(struct macsec_tx_sa *sa)
381{
382 if (refcount_dec_and_test(&sa->refcnt))
383 call_rcu(&sa->rcu, free_txsa);
384}
385
386static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
387{
388 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
389 return (struct macsec_cb *)skb->cb;
390}
391
392#define MACSEC_PORT_ES (htons(0x0001))
393#define MACSEC_PORT_SCB (0x0000)
394#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
395
396#define MACSEC_GCM_AES_128_SAK_LEN 16
397#define MACSEC_GCM_AES_256_SAK_LEN 32
398
399#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
400#define DEFAULT_SEND_SCI true
401#define DEFAULT_ENCRYPT false
402#define DEFAULT_ENCODING_SA 0
403
404static bool send_sci(const struct macsec_secy *secy)
405{
406 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
407
408 return tx_sc->send_sci ||
409 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
410}
411
412static sci_t make_sci(u8 *addr, __be16 port)
413{
414 sci_t sci;
415
416 memcpy(&sci, addr, ETH_ALEN);
417 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
418
419 return sci;
420}
421
422static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
423{
424 sci_t sci;
425
426 if (sci_present)
427 memcpy(&sci, hdr->secure_channel_id,
428 sizeof(hdr->secure_channel_id));
429 else
430 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
431
432 return sci;
433}
434
435static unsigned int macsec_sectag_len(bool sci_present)
436{
437 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
438}
439
440static unsigned int macsec_hdr_len(bool sci_present)
441{
442 return macsec_sectag_len(sci_present) + ETH_HLEN;
443}
444
445static unsigned int macsec_extra_len(bool sci_present)
446{
447 return macsec_sectag_len(sci_present) + sizeof(__be16);
448}
449
450/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
451static void macsec_fill_sectag(struct macsec_eth_header *h,
452 const struct macsec_secy *secy, u32 pn,
453 bool sci_present)
454{
455 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
456
457 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
458 h->eth.h_proto = htons(ETH_P_MACSEC);
459
460 if (sci_present) {
461 h->tci_an |= MACSEC_TCI_SC;
462 memcpy(&h->secure_channel_id, &secy->sci,
463 sizeof(h->secure_channel_id));
464 } else {
465 if (tx_sc->end_station)
466 h->tci_an |= MACSEC_TCI_ES;
467 if (tx_sc->scb)
468 h->tci_an |= MACSEC_TCI_SCB;
469 }
470
471 h->packet_number = htonl(pn);
472
473 /* with GCM, C/E clear for !encrypt, both set for encrypt */
474 if (tx_sc->encrypt)
475 h->tci_an |= MACSEC_TCI_CONFID;
476 else if (secy->icv_len != DEFAULT_ICV_LEN)
477 h->tci_an |= MACSEC_TCI_C;
478
479 h->tci_an |= tx_sc->encoding_sa;
480}
481
482static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
483{
484 if (data_len < MIN_NON_SHORT_LEN)
485 h->short_length = data_len;
486}
487
488/* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
489static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
490{
491 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
492 int len = skb->len - 2 * ETH_ALEN;
493 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
494
495 /* a) It comprises at least 17 octets */
496 if (skb->len <= 16)
497 return false;
498
499 /* b) MACsec EtherType: already checked */
500
501 /* c) V bit is clear */
502 if (h->tci_an & MACSEC_TCI_VERSION)
503 return false;
504
505 /* d) ES or SCB => !SC */
506 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
507 (h->tci_an & MACSEC_TCI_SC))
508 return false;
509
510 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
511 if (h->unused)
512 return false;
513
514 /* rx.pn != 0 (figure 10-5) */
515 if (!h->packet_number)
516 return false;
517
518 /* length check, f) g) h) i) */
519 if (h->short_length)
520 return len == extra_len + h->short_length;
521 return len >= extra_len + MIN_NON_SHORT_LEN;
522}
523
524#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
525#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
526
527static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
528{
529 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
530
531 gcm_iv->sci = sci;
532 gcm_iv->pn = htonl(pn);
533}
534
535static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
536{
537 return (struct macsec_eth_header *)skb_mac_header(skb);
538}
539
540static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
541{
542 u32 pn;
543
544 spin_lock_bh(&tx_sa->lock);
545 pn = tx_sa->next_pn;
546
547 tx_sa->next_pn++;
548 if (tx_sa->next_pn == 0) {
549 pr_debug("PN wrapped, transitioning to !oper\n");
550 tx_sa->active = false;
551 if (secy->protect_frames)
552 secy->operational = false;
553 }
554 spin_unlock_bh(&tx_sa->lock);
555
556 return pn;
557}
558
559static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
560{
561 struct macsec_dev *macsec = netdev_priv(dev);
562
563 skb->dev = macsec->real_dev;
564 skb_reset_mac_header(skb);
565 skb->protocol = eth_hdr(skb)->h_proto;
566}
567
568static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
569 struct macsec_tx_sa *tx_sa)
570{
571 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
572
573 u64_stats_update_begin(&txsc_stats->syncp);
574 if (tx_sc->encrypt) {
575 txsc_stats->stats.OutOctetsEncrypted += skb->len;
576 txsc_stats->stats.OutPktsEncrypted++;
577 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
578 } else {
579 txsc_stats->stats.OutOctetsProtected += skb->len;
580 txsc_stats->stats.OutPktsProtected++;
581 this_cpu_inc(tx_sa->stats->OutPktsProtected);
582 }
583 u64_stats_update_end(&txsc_stats->syncp);
584}
585
586static void count_tx(struct net_device *dev, int ret, int len)
587{
588 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
589 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
590
591 u64_stats_update_begin(&stats->syncp);
592 stats->tx_packets++;
593 stats->tx_bytes += len;
594 u64_stats_update_end(&stats->syncp);
595 }
596}
597
598static void macsec_encrypt_done(struct crypto_async_request *base, int err)
599{
600 struct sk_buff *skb = base->data;
601 struct net_device *dev = skb->dev;
602 struct macsec_dev *macsec = macsec_priv(dev);
603 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
604 int len, ret;
605
606 aead_request_free(macsec_skb_cb(skb)->req);
607
608 rcu_read_lock_bh();
609 macsec_encrypt_finish(skb, dev);
610 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
611 len = skb->len;
612 ret = dev_queue_xmit(skb);
613 count_tx(dev, ret, len);
614 rcu_read_unlock_bh();
615
616 macsec_txsa_put(sa);
617 dev_put(dev);
618}
619
620static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
621 unsigned char **iv,
622 struct scatterlist **sg,
623 int num_frags)
624{
625 size_t size, iv_offset, sg_offset;
626 struct aead_request *req;
627 void *tmp;
628
629 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
630 iv_offset = size;
631 size += GCM_AES_IV_LEN;
632
633 size = ALIGN(size, __alignof__(struct scatterlist));
634 sg_offset = size;
635 size += sizeof(struct scatterlist) * num_frags;
636
637 tmp = kmalloc(size, GFP_ATOMIC);
638 if (!tmp)
639 return NULL;
640
641 *iv = (unsigned char *)(tmp + iv_offset);
642 *sg = (struct scatterlist *)(tmp + sg_offset);
643 req = tmp;
644
645 aead_request_set_tfm(req, tfm);
646
647 return req;
648}
649
650static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
651 struct net_device *dev)
652{
653 int ret;
654 struct scatterlist *sg;
655 struct sk_buff *trailer;
656 unsigned char *iv;
657 struct ethhdr *eth;
658 struct macsec_eth_header *hh;
659 size_t unprotected_len;
660 struct aead_request *req;
661 struct macsec_secy *secy;
662 struct macsec_tx_sc *tx_sc;
663 struct macsec_tx_sa *tx_sa;
664 struct macsec_dev *macsec = macsec_priv(dev);
665 bool sci_present;
666 u32 pn;
667
668 secy = &macsec->secy;
669 tx_sc = &secy->tx_sc;
670
671 /* 10.5.1 TX SA assignment */
672 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
673 if (!tx_sa) {
674 secy->operational = false;
675 kfree_skb(skb);
676 return ERR_PTR(-EINVAL);
677 }
678
679 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
680 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
681 struct sk_buff *nskb = skb_copy_expand(skb,
682 MACSEC_NEEDED_HEADROOM,
683 MACSEC_NEEDED_TAILROOM,
684 GFP_ATOMIC);
685 if (likely(nskb)) {
686 consume_skb(skb);
687 skb = nskb;
688 } else {
689 macsec_txsa_put(tx_sa);
690 kfree_skb(skb);
691 return ERR_PTR(-ENOMEM);
692 }
693 } else {
694 skb = skb_unshare(skb, GFP_ATOMIC);
695 if (!skb) {
696 macsec_txsa_put(tx_sa);
697 return ERR_PTR(-ENOMEM);
698 }
699 }
700
701 unprotected_len = skb->len;
702 eth = eth_hdr(skb);
703 sci_present = send_sci(secy);
704 hh = skb_push(skb, macsec_extra_len(sci_present));
705 memmove(hh, eth, 2 * ETH_ALEN);
706
707 pn = tx_sa_update_pn(tx_sa, secy);
708 if (pn == 0) {
709 macsec_txsa_put(tx_sa);
710 kfree_skb(skb);
711 return ERR_PTR(-ENOLINK);
712 }
713 macsec_fill_sectag(hh, secy, pn, sci_present);
714 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
715
716 skb_put(skb, secy->icv_len);
717
718 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
719 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
720
721 u64_stats_update_begin(&secy_stats->syncp);
722 secy_stats->stats.OutPktsTooLong++;
723 u64_stats_update_end(&secy_stats->syncp);
724
725 macsec_txsa_put(tx_sa);
726 kfree_skb(skb);
727 return ERR_PTR(-EINVAL);
728 }
729
730 ret = skb_cow_data(skb, 0, &trailer);
731 if (unlikely(ret < 0)) {
732 macsec_txsa_put(tx_sa);
733 kfree_skb(skb);
734 return ERR_PTR(ret);
735 }
736
737 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
738 if (!req) {
739 macsec_txsa_put(tx_sa);
740 kfree_skb(skb);
741 return ERR_PTR(-ENOMEM);
742 }
743
744 macsec_fill_iv(iv, secy->sci, pn);
745
746 sg_init_table(sg, ret);
747 ret = skb_to_sgvec(skb, sg, 0, skb->len);
748 if (unlikely(ret < 0)) {
749 aead_request_free(req);
750 macsec_txsa_put(tx_sa);
751 kfree_skb(skb);
752 return ERR_PTR(ret);
753 }
754
755 if (tx_sc->encrypt) {
756 int len = skb->len - macsec_hdr_len(sci_present) -
757 secy->icv_len;
758 aead_request_set_crypt(req, sg, sg, len, iv);
759 aead_request_set_ad(req, macsec_hdr_len(sci_present));
760 } else {
761 aead_request_set_crypt(req, sg, sg, 0, iv);
762 aead_request_set_ad(req, skb->len - secy->icv_len);
763 }
764
765 macsec_skb_cb(skb)->req = req;
766 macsec_skb_cb(skb)->tx_sa = tx_sa;
767 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
768
769 dev_hold(skb->dev);
770 ret = crypto_aead_encrypt(req);
771 if (ret == -EINPROGRESS) {
772 return ERR_PTR(ret);
773 } else if (ret != 0) {
774 dev_put(skb->dev);
775 kfree_skb(skb);
776 aead_request_free(req);
777 macsec_txsa_put(tx_sa);
778 return ERR_PTR(-EINVAL);
779 }
780
781 dev_put(skb->dev);
782 aead_request_free(req);
783 macsec_txsa_put(tx_sa);
784
785 return skb;
786}
787
788static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
789{
790 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
791 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
792 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
793 u32 lowest_pn = 0;
794
795 spin_lock(&rx_sa->lock);
796 if (rx_sa->next_pn >= secy->replay_window)
797 lowest_pn = rx_sa->next_pn - secy->replay_window;
798
799 /* Now perform replay protection check again
800 * (see IEEE 802.1AE-2006 figure 10-5)
801 */
802 if (secy->replay_protect && pn < lowest_pn) {
803 spin_unlock(&rx_sa->lock);
804 u64_stats_update_begin(&rxsc_stats->syncp);
805 rxsc_stats->stats.InPktsLate++;
806 u64_stats_update_end(&rxsc_stats->syncp);
807 return false;
808 }
809
810 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
811 u64_stats_update_begin(&rxsc_stats->syncp);
812 if (hdr->tci_an & MACSEC_TCI_E)
813 rxsc_stats->stats.InOctetsDecrypted += skb->len;
814 else
815 rxsc_stats->stats.InOctetsValidated += skb->len;
816 u64_stats_update_end(&rxsc_stats->syncp);
817 }
818
819 if (!macsec_skb_cb(skb)->valid) {
820 spin_unlock(&rx_sa->lock);
821
822 /* 10.6.5 */
823 if (hdr->tci_an & MACSEC_TCI_C ||
824 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
825 u64_stats_update_begin(&rxsc_stats->syncp);
826 rxsc_stats->stats.InPktsNotValid++;
827 u64_stats_update_end(&rxsc_stats->syncp);
828 return false;
829 }
830
831 u64_stats_update_begin(&rxsc_stats->syncp);
832 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
833 rxsc_stats->stats.InPktsInvalid++;
834 this_cpu_inc(rx_sa->stats->InPktsInvalid);
835 } else if (pn < lowest_pn) {
836 rxsc_stats->stats.InPktsDelayed++;
837 } else {
838 rxsc_stats->stats.InPktsUnchecked++;
839 }
840 u64_stats_update_end(&rxsc_stats->syncp);
841 } else {
842 u64_stats_update_begin(&rxsc_stats->syncp);
843 if (pn < lowest_pn) {
844 rxsc_stats->stats.InPktsDelayed++;
845 } else {
846 rxsc_stats->stats.InPktsOK++;
847 this_cpu_inc(rx_sa->stats->InPktsOK);
848 }
849 u64_stats_update_end(&rxsc_stats->syncp);
850
851 if (pn >= rx_sa->next_pn)
852 rx_sa->next_pn = pn + 1;
853 spin_unlock(&rx_sa->lock);
854 }
855
856 return true;
857}
858
859static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
860{
861 skb->pkt_type = PACKET_HOST;
862 skb->protocol = eth_type_trans(skb, dev);
863
864 skb_reset_network_header(skb);
865 if (!skb_transport_header_was_set(skb))
866 skb_reset_transport_header(skb);
867 skb_reset_mac_len(skb);
868}
869
870static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
871{
872 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
873 skb_pull(skb, hdr_len);
874 pskb_trim_unique(skb, skb->len - icv_len);
875}
876
877static void count_rx(struct net_device *dev, int len)
878{
879 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
880
881 u64_stats_update_begin(&stats->syncp);
882 stats->rx_packets++;
883 stats->rx_bytes += len;
884 u64_stats_update_end(&stats->syncp);
885}
886
887static void macsec_decrypt_done(struct crypto_async_request *base, int err)
888{
889 struct sk_buff *skb = base->data;
890 struct net_device *dev = skb->dev;
891 struct macsec_dev *macsec = macsec_priv(dev);
892 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
893 struct macsec_rx_sc *rx_sc = rx_sa->sc;
894 int len;
895 u32 pn;
896
897 aead_request_free(macsec_skb_cb(skb)->req);
898
899 if (!err)
900 macsec_skb_cb(skb)->valid = true;
901
902 rcu_read_lock_bh();
903 pn = ntohl(macsec_ethhdr(skb)->packet_number);
904 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
905 rcu_read_unlock_bh();
906 kfree_skb(skb);
907 goto out;
908 }
909
910 macsec_finalize_skb(skb, macsec->secy.icv_len,
911 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
912 macsec_reset_skb(skb, macsec->secy.netdev);
913
914 len = skb->len;
915 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
916 count_rx(dev, len);
917
918 rcu_read_unlock_bh();
919
920out:
921 macsec_rxsa_put(rx_sa);
922 macsec_rxsc_put(rx_sc);
923 dev_put(dev);
924}
925
926static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
927 struct net_device *dev,
928 struct macsec_rx_sa *rx_sa,
929 sci_t sci,
930 struct macsec_secy *secy)
931{
932 int ret;
933 struct scatterlist *sg;
934 struct sk_buff *trailer;
935 unsigned char *iv;
936 struct aead_request *req;
937 struct macsec_eth_header *hdr;
938 u16 icv_len = secy->icv_len;
939
940 macsec_skb_cb(skb)->valid = false;
941 skb = skb_share_check(skb, GFP_ATOMIC);
942 if (!skb)
943 return ERR_PTR(-ENOMEM);
944
945 ret = skb_cow_data(skb, 0, &trailer);
946 if (unlikely(ret < 0)) {
947 kfree_skb(skb);
948 return ERR_PTR(ret);
949 }
950 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
951 if (!req) {
952 kfree_skb(skb);
953 return ERR_PTR(-ENOMEM);
954 }
955
956 hdr = (struct macsec_eth_header *)skb->data;
957 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
958
959 sg_init_table(sg, ret);
960 ret = skb_to_sgvec(skb, sg, 0, skb->len);
961 if (unlikely(ret < 0)) {
962 aead_request_free(req);
963 kfree_skb(skb);
964 return ERR_PTR(ret);
965 }
966
967 if (hdr->tci_an & MACSEC_TCI_E) {
968 /* confidentiality: ethernet + macsec header
969 * authenticated, encrypted payload
970 */
971 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
972
973 aead_request_set_crypt(req, sg, sg, len, iv);
974 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
975 skb = skb_unshare(skb, GFP_ATOMIC);
976 if (!skb) {
977 aead_request_free(req);
978 return ERR_PTR(-ENOMEM);
979 }
980 } else {
981 /* integrity only: all headers + data authenticated */
982 aead_request_set_crypt(req, sg, sg, icv_len, iv);
983 aead_request_set_ad(req, skb->len - icv_len);
984 }
985
986 macsec_skb_cb(skb)->req = req;
987 skb->dev = dev;
988 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
989
990 dev_hold(dev);
991 ret = crypto_aead_decrypt(req);
992 if (ret == -EINPROGRESS) {
993 return ERR_PTR(ret);
994 } else if (ret != 0) {
995 /* decryption/authentication failed
996 * 10.6 if validateFrames is disabled, deliver anyway
997 */
998 if (ret != -EBADMSG) {
999 kfree_skb(skb);
1000 skb = ERR_PTR(ret);
1001 }
1002 } else {
1003 macsec_skb_cb(skb)->valid = true;
1004 }
1005 dev_put(dev);
1006
1007 aead_request_free(req);
1008
1009 return skb;
1010}
1011
1012static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
1013{
1014 struct macsec_rx_sc *rx_sc;
1015
1016 for_each_rxsc(secy, rx_sc) {
1017 if (rx_sc->sci == sci)
1018 return rx_sc;
1019 }
1020
1021 return NULL;
1022}
1023
1024static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
1025{
1026 struct macsec_rx_sc *rx_sc;
1027
1028 for_each_rxsc_rtnl(secy, rx_sc) {
1029 if (rx_sc->sci == sci)
1030 return rx_sc;
1031 }
1032
1033 return NULL;
1034}
1035
1036static void handle_not_macsec(struct sk_buff *skb)
1037{
1038 struct macsec_rxh_data *rxd;
1039 struct macsec_dev *macsec;
1040
1041 rcu_read_lock();
1042 rxd = macsec_data_rcu(skb->dev);
1043
1044 /* 10.6 If the management control validateFrames is not
1045 * Strict, frames without a SecTAG are received, counted, and
1046 * delivered to the Controlled Port
1047 */
1048 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1049 struct sk_buff *nskb;
1050 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1051
1052 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1053 u64_stats_update_begin(&secy_stats->syncp);
1054 secy_stats->stats.InPktsNoTag++;
1055 u64_stats_update_end(&secy_stats->syncp);
1056 continue;
1057 }
1058
1059 /* deliver on this port */
1060 nskb = skb_clone(skb, GFP_ATOMIC);
1061 if (!nskb)
1062 break;
1063
1064 nskb->dev = macsec->secy.netdev;
1065
1066 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1067 u64_stats_update_begin(&secy_stats->syncp);
1068 secy_stats->stats.InPktsUntagged++;
1069 u64_stats_update_end(&secy_stats->syncp);
1070 }
1071 }
1072
1073 rcu_read_unlock();
1074}
1075
1076static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1077{
1078 struct sk_buff *skb = *pskb;
1079 struct net_device *dev = skb->dev;
1080 struct macsec_eth_header *hdr;
1081 struct macsec_secy *secy = NULL;
1082 struct macsec_rx_sc *rx_sc;
1083 struct macsec_rx_sa *rx_sa;
1084 struct macsec_rxh_data *rxd;
1085 struct macsec_dev *macsec;
1086 sci_t sci;
1087 u32 pn;
1088 bool cbit;
1089 struct pcpu_rx_sc_stats *rxsc_stats;
1090 struct pcpu_secy_stats *secy_stats;
1091 bool pulled_sci;
1092 int ret;
1093
1094 if (skb_headroom(skb) < ETH_HLEN)
1095 goto drop_direct;
1096
1097 hdr = macsec_ethhdr(skb);
1098 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1099 handle_not_macsec(skb);
1100
1101 /* and deliver to the uncontrolled port */
1102 return RX_HANDLER_PASS;
1103 }
1104
1105 skb = skb_unshare(skb, GFP_ATOMIC);
1106 if (!skb) {
1107 *pskb = NULL;
1108 return RX_HANDLER_CONSUMED;
1109 }
1110
1111 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1112 if (!pulled_sci) {
1113 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1114 goto drop_direct;
1115 }
1116
1117 hdr = macsec_ethhdr(skb);
1118
1119 /* Frames with a SecTAG that has the TCI E bit set but the C
1120 * bit clear are discarded, as this reserved encoding is used
1121 * to identify frames with a SecTAG that are not to be
1122 * delivered to the Controlled Port.
1123 */
1124 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1125 return RX_HANDLER_PASS;
1126
1127 /* now, pull the extra length */
1128 if (hdr->tci_an & MACSEC_TCI_SC) {
1129 if (!pulled_sci)
1130 goto drop_direct;
1131 }
1132
1133 /* ethernet header is part of crypto processing */
1134 skb_push(skb, ETH_HLEN);
1135
1136 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1137 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1138 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1139
1140 rcu_read_lock();
1141 rxd = macsec_data_rcu(skb->dev);
1142
1143 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1144 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1145 sc = sc ? macsec_rxsc_get(sc) : NULL;
1146
1147 if (sc) {
1148 secy = &macsec->secy;
1149 rx_sc = sc;
1150 break;
1151 }
1152 }
1153
1154 if (!secy)
1155 goto nosci;
1156
1157 dev = secy->netdev;
1158 macsec = macsec_priv(dev);
1159 secy_stats = this_cpu_ptr(macsec->stats);
1160 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1161
1162 if (!macsec_validate_skb(skb, secy->icv_len)) {
1163 u64_stats_update_begin(&secy_stats->syncp);
1164 secy_stats->stats.InPktsBadTag++;
1165 u64_stats_update_end(&secy_stats->syncp);
1166 goto drop_nosa;
1167 }
1168
1169 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1170 if (!rx_sa) {
1171 /* 10.6.1 if the SA is not in use */
1172
1173 /* If validateFrames is Strict or the C bit in the
1174 * SecTAG is set, discard
1175 */
1176 if (hdr->tci_an & MACSEC_TCI_C ||
1177 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1178 u64_stats_update_begin(&rxsc_stats->syncp);
1179 rxsc_stats->stats.InPktsNotUsingSA++;
1180 u64_stats_update_end(&rxsc_stats->syncp);
1181 goto drop_nosa;
1182 }
1183
1184 /* not Strict, the frame (with the SecTAG and ICV
1185 * removed) is delivered to the Controlled Port.
1186 */
1187 u64_stats_update_begin(&rxsc_stats->syncp);
1188 rxsc_stats->stats.InPktsUnusedSA++;
1189 u64_stats_update_end(&rxsc_stats->syncp);
1190 goto deliver;
1191 }
1192
1193 /* First, PN check to avoid decrypting obviously wrong packets */
1194 pn = ntohl(hdr->packet_number);
1195 if (secy->replay_protect) {
1196 bool late;
1197
1198 spin_lock(&rx_sa->lock);
1199 late = rx_sa->next_pn >= secy->replay_window &&
1200 pn < (rx_sa->next_pn - secy->replay_window);
1201 spin_unlock(&rx_sa->lock);
1202
1203 if (late) {
1204 u64_stats_update_begin(&rxsc_stats->syncp);
1205 rxsc_stats->stats.InPktsLate++;
1206 u64_stats_update_end(&rxsc_stats->syncp);
1207 goto drop;
1208 }
1209 }
1210
1211 macsec_skb_cb(skb)->rx_sa = rx_sa;
1212
1213 /* Disabled && !changed text => skip validation */
1214 if (hdr->tci_an & MACSEC_TCI_C ||
1215 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1216 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1217
1218 if (IS_ERR(skb)) {
1219 /* the decrypt callback needs the reference */
1220 if (PTR_ERR(skb) != -EINPROGRESS) {
1221 macsec_rxsa_put(rx_sa);
1222 macsec_rxsc_put(rx_sc);
1223 }
1224 rcu_read_unlock();
1225 *pskb = NULL;
1226 return RX_HANDLER_CONSUMED;
1227 }
1228
1229 if (!macsec_post_decrypt(skb, secy, pn))
1230 goto drop;
1231
1232deliver:
1233 macsec_finalize_skb(skb, secy->icv_len,
1234 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1235 macsec_reset_skb(skb, secy->netdev);
1236
1237 if (rx_sa)
1238 macsec_rxsa_put(rx_sa);
1239 macsec_rxsc_put(rx_sc);
1240
1241 ret = gro_cells_receive(&macsec->gro_cells, skb);
1242 if (ret == NET_RX_SUCCESS)
1243 count_rx(dev, skb->len);
1244 else
1245 macsec->secy.netdev->stats.rx_dropped++;
1246
1247 rcu_read_unlock();
1248
1249 *pskb = NULL;
1250 return RX_HANDLER_CONSUMED;
1251
1252drop:
1253 macsec_rxsa_put(rx_sa);
1254drop_nosa:
1255 macsec_rxsc_put(rx_sc);
1256 rcu_read_unlock();
1257drop_direct:
1258 kfree_skb(skb);
1259 *pskb = NULL;
1260 return RX_HANDLER_CONSUMED;
1261
1262nosci:
1263 /* 10.6.1 if the SC is not found */
1264 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1265 if (!cbit)
1266 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1267 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1268
1269 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1270 struct sk_buff *nskb;
1271
1272 secy_stats = this_cpu_ptr(macsec->stats);
1273
1274 /* If validateFrames is Strict or the C bit in the
1275 * SecTAG is set, discard
1276 */
1277 if (cbit ||
1278 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1279 u64_stats_update_begin(&secy_stats->syncp);
1280 secy_stats->stats.InPktsNoSCI++;
1281 u64_stats_update_end(&secy_stats->syncp);
1282 continue;
1283 }
1284
1285 /* not strict, the frame (with the SecTAG and ICV
1286 * removed) is delivered to the Controlled Port.
1287 */
1288 nskb = skb_clone(skb, GFP_ATOMIC);
1289 if (!nskb)
1290 break;
1291
1292 macsec_reset_skb(nskb, macsec->secy.netdev);
1293
1294 ret = netif_rx(nskb);
1295 if (ret == NET_RX_SUCCESS) {
1296 u64_stats_update_begin(&secy_stats->syncp);
1297 secy_stats->stats.InPktsUnknownSCI++;
1298 u64_stats_update_end(&secy_stats->syncp);
1299 } else {
1300 macsec->secy.netdev->stats.rx_dropped++;
1301 }
1302 }
1303
1304 rcu_read_unlock();
1305 *pskb = skb;
1306 return RX_HANDLER_PASS;
1307}
1308
1309static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1310{
1311 struct crypto_aead *tfm;
1312 int ret;
1313
1314 tfm = crypto_alloc_aead("gcm(aes)", 0, 0);
1315
1316 if (IS_ERR(tfm))
1317 return tfm;
1318
1319 ret = crypto_aead_setkey(tfm, key, key_len);
1320 if (ret < 0)
1321 goto fail;
1322
1323 ret = crypto_aead_setauthsize(tfm, icv_len);
1324 if (ret < 0)
1325 goto fail;
1326
1327 return tfm;
1328fail:
1329 crypto_free_aead(tfm);
1330 return ERR_PTR(ret);
1331}
1332
1333static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1334 int icv_len)
1335{
1336 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1337 if (!rx_sa->stats)
1338 return -ENOMEM;
1339
1340 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1341 if (IS_ERR(rx_sa->key.tfm)) {
1342 free_percpu(rx_sa->stats);
1343 return PTR_ERR(rx_sa->key.tfm);
1344 }
1345
1346 rx_sa->active = false;
1347 rx_sa->next_pn = 1;
1348 refcount_set(&rx_sa->refcnt, 1);
1349 spin_lock_init(&rx_sa->lock);
1350
1351 return 0;
1352}
1353
1354static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1355{
1356 rx_sa->active = false;
1357
1358 macsec_rxsa_put(rx_sa);
1359}
1360
1361static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1362{
1363 int i;
1364
1365 for (i = 0; i < MACSEC_NUM_AN; i++) {
1366 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1367
1368 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1369 if (sa)
1370 clear_rx_sa(sa);
1371 }
1372
1373 macsec_rxsc_put(rx_sc);
1374}
1375
1376static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1377{
1378 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1379
1380 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1381 rx_sc;
1382 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1383 if (rx_sc->sci == sci) {
1384 if (rx_sc->active)
1385 secy->n_rx_sc--;
1386 rcu_assign_pointer(*rx_scp, rx_sc->next);
1387 return rx_sc;
1388 }
1389 }
1390
1391 return NULL;
1392}
1393
1394static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1395{
1396 struct macsec_rx_sc *rx_sc;
1397 struct macsec_dev *macsec;
1398 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1399 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1400 struct macsec_secy *secy;
1401
1402 list_for_each_entry(macsec, &rxd->secys, secys) {
1403 if (find_rx_sc_rtnl(&macsec->secy, sci))
1404 return ERR_PTR(-EEXIST);
1405 }
1406
1407 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1408 if (!rx_sc)
1409 return ERR_PTR(-ENOMEM);
1410
1411 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1412 if (!rx_sc->stats) {
1413 kfree(rx_sc);
1414 return ERR_PTR(-ENOMEM);
1415 }
1416
1417 rx_sc->sci = sci;
1418 rx_sc->active = true;
1419 refcount_set(&rx_sc->refcnt, 1);
1420
1421 secy = &macsec_priv(dev)->secy;
1422 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1423 rcu_assign_pointer(secy->rx_sc, rx_sc);
1424
1425 if (rx_sc->active)
1426 secy->n_rx_sc++;
1427
1428 return rx_sc;
1429}
1430
1431static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1432 int icv_len)
1433{
1434 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1435 if (!tx_sa->stats)
1436 return -ENOMEM;
1437
1438 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1439 if (IS_ERR(tx_sa->key.tfm)) {
1440 free_percpu(tx_sa->stats);
1441 return PTR_ERR(tx_sa->key.tfm);
1442 }
1443
1444 tx_sa->active = false;
1445 refcount_set(&tx_sa->refcnt, 1);
1446 spin_lock_init(&tx_sa->lock);
1447
1448 return 0;
1449}
1450
1451static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1452{
1453 tx_sa->active = false;
1454
1455 macsec_txsa_put(tx_sa);
1456}
1457
1458static struct genl_family macsec_fam;
1459
1460static struct net_device *get_dev_from_nl(struct net *net,
1461 struct nlattr **attrs)
1462{
1463 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1464 struct net_device *dev;
1465
1466 dev = __dev_get_by_index(net, ifindex);
1467 if (!dev)
1468 return ERR_PTR(-ENODEV);
1469
1470 if (!netif_is_macsec(dev))
1471 return ERR_PTR(-ENODEV);
1472
1473 return dev;
1474}
1475
1476static sci_t nla_get_sci(const struct nlattr *nla)
1477{
1478 return (__force sci_t)nla_get_u64(nla);
1479}
1480
1481static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1482 int padattr)
1483{
1484 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1485}
1486
1487static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1488 struct nlattr **attrs,
1489 struct nlattr **tb_sa,
1490 struct net_device **devp,
1491 struct macsec_secy **secyp,
1492 struct macsec_tx_sc **scp,
1493 u8 *assoc_num)
1494{
1495 struct net_device *dev;
1496 struct macsec_secy *secy;
1497 struct macsec_tx_sc *tx_sc;
1498 struct macsec_tx_sa *tx_sa;
1499
1500 if (!tb_sa[MACSEC_SA_ATTR_AN])
1501 return ERR_PTR(-EINVAL);
1502
1503 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1504
1505 dev = get_dev_from_nl(net, attrs);
1506 if (IS_ERR(dev))
1507 return ERR_CAST(dev);
1508
1509 if (*assoc_num >= MACSEC_NUM_AN)
1510 return ERR_PTR(-EINVAL);
1511
1512 secy = &macsec_priv(dev)->secy;
1513 tx_sc = &secy->tx_sc;
1514
1515 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1516 if (!tx_sa)
1517 return ERR_PTR(-ENODEV);
1518
1519 *devp = dev;
1520 *scp = tx_sc;
1521 *secyp = secy;
1522 return tx_sa;
1523}
1524
1525static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1526 struct nlattr **attrs,
1527 struct nlattr **tb_rxsc,
1528 struct net_device **devp,
1529 struct macsec_secy **secyp)
1530{
1531 struct net_device *dev;
1532 struct macsec_secy *secy;
1533 struct macsec_rx_sc *rx_sc;
1534 sci_t sci;
1535
1536 dev = get_dev_from_nl(net, attrs);
1537 if (IS_ERR(dev))
1538 return ERR_CAST(dev);
1539
1540 secy = &macsec_priv(dev)->secy;
1541
1542 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1543 return ERR_PTR(-EINVAL);
1544
1545 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1546 rx_sc = find_rx_sc_rtnl(secy, sci);
1547 if (!rx_sc)
1548 return ERR_PTR(-ENODEV);
1549
1550 *secyp = secy;
1551 *devp = dev;
1552
1553 return rx_sc;
1554}
1555
1556static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1557 struct nlattr **attrs,
1558 struct nlattr **tb_rxsc,
1559 struct nlattr **tb_sa,
1560 struct net_device **devp,
1561 struct macsec_secy **secyp,
1562 struct macsec_rx_sc **scp,
1563 u8 *assoc_num)
1564{
1565 struct macsec_rx_sc *rx_sc;
1566 struct macsec_rx_sa *rx_sa;
1567
1568 if (!tb_sa[MACSEC_SA_ATTR_AN])
1569 return ERR_PTR(-EINVAL);
1570
1571 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1572 if (*assoc_num >= MACSEC_NUM_AN)
1573 return ERR_PTR(-EINVAL);
1574
1575 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1576 if (IS_ERR(rx_sc))
1577 return ERR_CAST(rx_sc);
1578
1579 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1580 if (!rx_sa)
1581 return ERR_PTR(-ENODEV);
1582
1583 *scp = rx_sc;
1584 return rx_sa;
1585}
1586
1587
1588static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1589 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1590 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1591 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1592};
1593
1594static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1595 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1596 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1597};
1598
1599static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1600 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1601 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1602 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1603 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1604 .len = MACSEC_KEYID_LEN, },
1605 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1606 .len = MACSEC_MAX_KEY_LEN, },
1607};
1608
1609static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1610{
1611 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1612 return -EINVAL;
1613
1614 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX,
1615 attrs[MACSEC_ATTR_SA_CONFIG],
1616 macsec_genl_sa_policy, NULL))
1617 return -EINVAL;
1618
1619 return 0;
1620}
1621
1622static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1623{
1624 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1625 return -EINVAL;
1626
1627 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX,
1628 attrs[MACSEC_ATTR_RXSC_CONFIG],
1629 macsec_genl_rxsc_policy, NULL))
1630 return -EINVAL;
1631
1632 return 0;
1633}
1634
1635static bool validate_add_rxsa(struct nlattr **attrs)
1636{
1637 if (!attrs[MACSEC_SA_ATTR_AN] ||
1638 !attrs[MACSEC_SA_ATTR_KEY] ||
1639 !attrs[MACSEC_SA_ATTR_KEYID])
1640 return false;
1641
1642 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1643 return false;
1644
1645 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1646 return false;
1647
1648 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1649 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1650 return false;
1651 }
1652
1653 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1654 return false;
1655
1656 return true;
1657}
1658
1659static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1660{
1661 struct net_device *dev;
1662 struct nlattr **attrs = info->attrs;
1663 struct macsec_secy *secy;
1664 struct macsec_rx_sc *rx_sc;
1665 struct macsec_rx_sa *rx_sa;
1666 unsigned char assoc_num;
1667 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1668 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1669 int err;
1670
1671 if (!attrs[MACSEC_ATTR_IFINDEX])
1672 return -EINVAL;
1673
1674 if (parse_sa_config(attrs, tb_sa))
1675 return -EINVAL;
1676
1677 if (parse_rxsc_config(attrs, tb_rxsc))
1678 return -EINVAL;
1679
1680 if (!validate_add_rxsa(tb_sa))
1681 return -EINVAL;
1682
1683 rtnl_lock();
1684 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1685 if (IS_ERR(rx_sc)) {
1686 rtnl_unlock();
1687 return PTR_ERR(rx_sc);
1688 }
1689
1690 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1691
1692 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1693 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1694 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1695 rtnl_unlock();
1696 return -EINVAL;
1697 }
1698
1699 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1700 if (rx_sa) {
1701 rtnl_unlock();
1702 return -EBUSY;
1703 }
1704
1705 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1706 if (!rx_sa) {
1707 rtnl_unlock();
1708 return -ENOMEM;
1709 }
1710
1711 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1712 secy->key_len, secy->icv_len);
1713 if (err < 0) {
1714 kfree(rx_sa);
1715 rtnl_unlock();
1716 return err;
1717 }
1718
1719 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1720 spin_lock_bh(&rx_sa->lock);
1721 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1722 spin_unlock_bh(&rx_sa->lock);
1723 }
1724
1725 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1726 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1727
1728 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1729 rx_sa->sc = rx_sc;
1730 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1731
1732 rtnl_unlock();
1733
1734 return 0;
1735}
1736
1737static bool validate_add_rxsc(struct nlattr **attrs)
1738{
1739 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1740 return false;
1741
1742 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1743 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1744 return false;
1745 }
1746
1747 return true;
1748}
1749
1750static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1751{
1752 struct net_device *dev;
1753 sci_t sci = MACSEC_UNDEF_SCI;
1754 struct nlattr **attrs = info->attrs;
1755 struct macsec_rx_sc *rx_sc;
1756 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1757
1758 if (!attrs[MACSEC_ATTR_IFINDEX])
1759 return -EINVAL;
1760
1761 if (parse_rxsc_config(attrs, tb_rxsc))
1762 return -EINVAL;
1763
1764 if (!validate_add_rxsc(tb_rxsc))
1765 return -EINVAL;
1766
1767 rtnl_lock();
1768 dev = get_dev_from_nl(genl_info_net(info), attrs);
1769 if (IS_ERR(dev)) {
1770 rtnl_unlock();
1771 return PTR_ERR(dev);
1772 }
1773
1774 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1775
1776 rx_sc = create_rx_sc(dev, sci);
1777 if (IS_ERR(rx_sc)) {
1778 rtnl_unlock();
1779 return PTR_ERR(rx_sc);
1780 }
1781
1782 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1783 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1784
1785 rtnl_unlock();
1786
1787 return 0;
1788}
1789
1790static bool validate_add_txsa(struct nlattr **attrs)
1791{
1792 if (!attrs[MACSEC_SA_ATTR_AN] ||
1793 !attrs[MACSEC_SA_ATTR_PN] ||
1794 !attrs[MACSEC_SA_ATTR_KEY] ||
1795 !attrs[MACSEC_SA_ATTR_KEYID])
1796 return false;
1797
1798 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1799 return false;
1800
1801 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1802 return false;
1803
1804 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1805 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1806 return false;
1807 }
1808
1809 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1810 return false;
1811
1812 return true;
1813}
1814
1815static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1816{
1817 struct net_device *dev;
1818 struct nlattr **attrs = info->attrs;
1819 struct macsec_secy *secy;
1820 struct macsec_tx_sc *tx_sc;
1821 struct macsec_tx_sa *tx_sa;
1822 unsigned char assoc_num;
1823 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1824 int err;
1825
1826 if (!attrs[MACSEC_ATTR_IFINDEX])
1827 return -EINVAL;
1828
1829 if (parse_sa_config(attrs, tb_sa))
1830 return -EINVAL;
1831
1832 if (!validate_add_txsa(tb_sa))
1833 return -EINVAL;
1834
1835 rtnl_lock();
1836 dev = get_dev_from_nl(genl_info_net(info), attrs);
1837 if (IS_ERR(dev)) {
1838 rtnl_unlock();
1839 return PTR_ERR(dev);
1840 }
1841
1842 secy = &macsec_priv(dev)->secy;
1843 tx_sc = &secy->tx_sc;
1844
1845 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1846
1847 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1848 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1849 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1850 rtnl_unlock();
1851 return -EINVAL;
1852 }
1853
1854 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1855 if (tx_sa) {
1856 rtnl_unlock();
1857 return -EBUSY;
1858 }
1859
1860 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1861 if (!tx_sa) {
1862 rtnl_unlock();
1863 return -ENOMEM;
1864 }
1865
1866 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1867 secy->key_len, secy->icv_len);
1868 if (err < 0) {
1869 kfree(tx_sa);
1870 rtnl_unlock();
1871 return err;
1872 }
1873
1874 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1875
1876 spin_lock_bh(&tx_sa->lock);
1877 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1878 spin_unlock_bh(&tx_sa->lock);
1879
1880 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1881 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1882
1883 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1884 secy->operational = true;
1885
1886 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1887
1888 rtnl_unlock();
1889
1890 return 0;
1891}
1892
1893static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1894{
1895 struct nlattr **attrs = info->attrs;
1896 struct net_device *dev;
1897 struct macsec_secy *secy;
1898 struct macsec_rx_sc *rx_sc;
1899 struct macsec_rx_sa *rx_sa;
1900 u8 assoc_num;
1901 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1902 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1903
1904 if (!attrs[MACSEC_ATTR_IFINDEX])
1905 return -EINVAL;
1906
1907 if (parse_sa_config(attrs, tb_sa))
1908 return -EINVAL;
1909
1910 if (parse_rxsc_config(attrs, tb_rxsc))
1911 return -EINVAL;
1912
1913 rtnl_lock();
1914 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1915 &dev, &secy, &rx_sc, &assoc_num);
1916 if (IS_ERR(rx_sa)) {
1917 rtnl_unlock();
1918 return PTR_ERR(rx_sa);
1919 }
1920
1921 if (rx_sa->active) {
1922 rtnl_unlock();
1923 return -EBUSY;
1924 }
1925
1926 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1927 clear_rx_sa(rx_sa);
1928
1929 rtnl_unlock();
1930
1931 return 0;
1932}
1933
1934static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1935{
1936 struct nlattr **attrs = info->attrs;
1937 struct net_device *dev;
1938 struct macsec_secy *secy;
1939 struct macsec_rx_sc *rx_sc;
1940 sci_t sci;
1941 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1942
1943 if (!attrs[MACSEC_ATTR_IFINDEX])
1944 return -EINVAL;
1945
1946 if (parse_rxsc_config(attrs, tb_rxsc))
1947 return -EINVAL;
1948
1949 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1950 return -EINVAL;
1951
1952 rtnl_lock();
1953 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1954 if (IS_ERR(dev)) {
1955 rtnl_unlock();
1956 return PTR_ERR(dev);
1957 }
1958
1959 secy = &macsec_priv(dev)->secy;
1960 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1961
1962 rx_sc = del_rx_sc(secy, sci);
1963 if (!rx_sc) {
1964 rtnl_unlock();
1965 return -ENODEV;
1966 }
1967
1968 free_rx_sc(rx_sc);
1969 rtnl_unlock();
1970
1971 return 0;
1972}
1973
1974static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1975{
1976 struct nlattr **attrs = info->attrs;
1977 struct net_device *dev;
1978 struct macsec_secy *secy;
1979 struct macsec_tx_sc *tx_sc;
1980 struct macsec_tx_sa *tx_sa;
1981 u8 assoc_num;
1982 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1983
1984 if (!attrs[MACSEC_ATTR_IFINDEX])
1985 return -EINVAL;
1986
1987 if (parse_sa_config(attrs, tb_sa))
1988 return -EINVAL;
1989
1990 rtnl_lock();
1991 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1992 &dev, &secy, &tx_sc, &assoc_num);
1993 if (IS_ERR(tx_sa)) {
1994 rtnl_unlock();
1995 return PTR_ERR(tx_sa);
1996 }
1997
1998 if (tx_sa->active) {
1999 rtnl_unlock();
2000 return -EBUSY;
2001 }
2002
2003 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2004 clear_tx_sa(tx_sa);
2005
2006 rtnl_unlock();
2007
2008 return 0;
2009}
2010
2011static bool validate_upd_sa(struct nlattr **attrs)
2012{
2013 if (!attrs[MACSEC_SA_ATTR_AN] ||
2014 attrs[MACSEC_SA_ATTR_KEY] ||
2015 attrs[MACSEC_SA_ATTR_KEYID])
2016 return false;
2017
2018 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2019 return false;
2020
2021 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2022 return false;
2023
2024 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2025 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2026 return false;
2027 }
2028
2029 return true;
2030}
2031
2032static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2033{
2034 struct nlattr **attrs = info->attrs;
2035 struct net_device *dev;
2036 struct macsec_secy *secy;
2037 struct macsec_tx_sc *tx_sc;
2038 struct macsec_tx_sa *tx_sa;
2039 u8 assoc_num;
2040 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2041
2042 if (!attrs[MACSEC_ATTR_IFINDEX])
2043 return -EINVAL;
2044
2045 if (parse_sa_config(attrs, tb_sa))
2046 return -EINVAL;
2047
2048 if (!validate_upd_sa(tb_sa))
2049 return -EINVAL;
2050
2051 rtnl_lock();
2052 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2053 &dev, &secy, &tx_sc, &assoc_num);
2054 if (IS_ERR(tx_sa)) {
2055 rtnl_unlock();
2056 return PTR_ERR(tx_sa);
2057 }
2058
2059 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2060 spin_lock_bh(&tx_sa->lock);
2061 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2062 spin_unlock_bh(&tx_sa->lock);
2063 }
2064
2065 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2066 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2067
2068 if (assoc_num == tx_sc->encoding_sa)
2069 secy->operational = tx_sa->active;
2070
2071 rtnl_unlock();
2072
2073 return 0;
2074}
2075
2076static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2077{
2078 struct nlattr **attrs = info->attrs;
2079 struct net_device *dev;
2080 struct macsec_secy *secy;
2081 struct macsec_rx_sc *rx_sc;
2082 struct macsec_rx_sa *rx_sa;
2083 u8 assoc_num;
2084 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2085 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2086
2087 if (!attrs[MACSEC_ATTR_IFINDEX])
2088 return -EINVAL;
2089
2090 if (parse_rxsc_config(attrs, tb_rxsc))
2091 return -EINVAL;
2092
2093 if (parse_sa_config(attrs, tb_sa))
2094 return -EINVAL;
2095
2096 if (!validate_upd_sa(tb_sa))
2097 return -EINVAL;
2098
2099 rtnl_lock();
2100 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2101 &dev, &secy, &rx_sc, &assoc_num);
2102 if (IS_ERR(rx_sa)) {
2103 rtnl_unlock();
2104 return PTR_ERR(rx_sa);
2105 }
2106
2107 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2108 spin_lock_bh(&rx_sa->lock);
2109 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2110 spin_unlock_bh(&rx_sa->lock);
2111 }
2112
2113 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2114 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2115
2116 rtnl_unlock();
2117 return 0;
2118}
2119
2120static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2121{
2122 struct nlattr **attrs = info->attrs;
2123 struct net_device *dev;
2124 struct macsec_secy *secy;
2125 struct macsec_rx_sc *rx_sc;
2126 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2127
2128 if (!attrs[MACSEC_ATTR_IFINDEX])
2129 return -EINVAL;
2130
2131 if (parse_rxsc_config(attrs, tb_rxsc))
2132 return -EINVAL;
2133
2134 if (!validate_add_rxsc(tb_rxsc))
2135 return -EINVAL;
2136
2137 rtnl_lock();
2138 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2139 if (IS_ERR(rx_sc)) {
2140 rtnl_unlock();
2141 return PTR_ERR(rx_sc);
2142 }
2143
2144 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2145 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2146
2147 if (rx_sc->active != new)
2148 secy->n_rx_sc += new ? 1 : -1;
2149
2150 rx_sc->active = new;
2151 }
2152
2153 rtnl_unlock();
2154
2155 return 0;
2156}
2157
2158static int copy_tx_sa_stats(struct sk_buff *skb,
2159 struct macsec_tx_sa_stats __percpu *pstats)
2160{
2161 struct macsec_tx_sa_stats sum = {0, };
2162 int cpu;
2163
2164 for_each_possible_cpu(cpu) {
2165 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2166
2167 sum.OutPktsProtected += stats->OutPktsProtected;
2168 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2169 }
2170
2171 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2172 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2173 return -EMSGSIZE;
2174
2175 return 0;
2176}
2177
2178static int copy_rx_sa_stats(struct sk_buff *skb,
2179 struct macsec_rx_sa_stats __percpu *pstats)
2180{
2181 struct macsec_rx_sa_stats sum = {0, };
2182 int cpu;
2183
2184 for_each_possible_cpu(cpu) {
2185 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2186
2187 sum.InPktsOK += stats->InPktsOK;
2188 sum.InPktsInvalid += stats->InPktsInvalid;
2189 sum.InPktsNotValid += stats->InPktsNotValid;
2190 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2191 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2192 }
2193
2194 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2195 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2196 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2197 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2198 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2199 return -EMSGSIZE;
2200
2201 return 0;
2202}
2203
2204static int copy_rx_sc_stats(struct sk_buff *skb,
2205 struct pcpu_rx_sc_stats __percpu *pstats)
2206{
2207 struct macsec_rx_sc_stats sum = {0, };
2208 int cpu;
2209
2210 for_each_possible_cpu(cpu) {
2211 const struct pcpu_rx_sc_stats *stats;
2212 struct macsec_rx_sc_stats tmp;
2213 unsigned int start;
2214
2215 stats = per_cpu_ptr(pstats, cpu);
2216 do {
2217 start = u64_stats_fetch_begin_irq(&stats->syncp);
2218 memcpy(&tmp, &stats->stats, sizeof(tmp));
2219 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2220
2221 sum.InOctetsValidated += tmp.InOctetsValidated;
2222 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2223 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2224 sum.InPktsDelayed += tmp.InPktsDelayed;
2225 sum.InPktsOK += tmp.InPktsOK;
2226 sum.InPktsInvalid += tmp.InPktsInvalid;
2227 sum.InPktsLate += tmp.InPktsLate;
2228 sum.InPktsNotValid += tmp.InPktsNotValid;
2229 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2230 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2231 }
2232
2233 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2234 sum.InOctetsValidated,
2235 MACSEC_RXSC_STATS_ATTR_PAD) ||
2236 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2237 sum.InOctetsDecrypted,
2238 MACSEC_RXSC_STATS_ATTR_PAD) ||
2239 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2240 sum.InPktsUnchecked,
2241 MACSEC_RXSC_STATS_ATTR_PAD) ||
2242 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2243 sum.InPktsDelayed,
2244 MACSEC_RXSC_STATS_ATTR_PAD) ||
2245 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2246 sum.InPktsOK,
2247 MACSEC_RXSC_STATS_ATTR_PAD) ||
2248 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2249 sum.InPktsInvalid,
2250 MACSEC_RXSC_STATS_ATTR_PAD) ||
2251 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2252 sum.InPktsLate,
2253 MACSEC_RXSC_STATS_ATTR_PAD) ||
2254 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2255 sum.InPktsNotValid,
2256 MACSEC_RXSC_STATS_ATTR_PAD) ||
2257 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2258 sum.InPktsNotUsingSA,
2259 MACSEC_RXSC_STATS_ATTR_PAD) ||
2260 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2261 sum.InPktsUnusedSA,
2262 MACSEC_RXSC_STATS_ATTR_PAD))
2263 return -EMSGSIZE;
2264
2265 return 0;
2266}
2267
2268static int copy_tx_sc_stats(struct sk_buff *skb,
2269 struct pcpu_tx_sc_stats __percpu *pstats)
2270{
2271 struct macsec_tx_sc_stats sum = {0, };
2272 int cpu;
2273
2274 for_each_possible_cpu(cpu) {
2275 const struct pcpu_tx_sc_stats *stats;
2276 struct macsec_tx_sc_stats tmp;
2277 unsigned int start;
2278
2279 stats = per_cpu_ptr(pstats, cpu);
2280 do {
2281 start = u64_stats_fetch_begin_irq(&stats->syncp);
2282 memcpy(&tmp, &stats->stats, sizeof(tmp));
2283 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2284
2285 sum.OutPktsProtected += tmp.OutPktsProtected;
2286 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2287 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2288 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2289 }
2290
2291 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2292 sum.OutPktsProtected,
2293 MACSEC_TXSC_STATS_ATTR_PAD) ||
2294 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2295 sum.OutPktsEncrypted,
2296 MACSEC_TXSC_STATS_ATTR_PAD) ||
2297 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2298 sum.OutOctetsProtected,
2299 MACSEC_TXSC_STATS_ATTR_PAD) ||
2300 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2301 sum.OutOctetsEncrypted,
2302 MACSEC_TXSC_STATS_ATTR_PAD))
2303 return -EMSGSIZE;
2304
2305 return 0;
2306}
2307
2308static int copy_secy_stats(struct sk_buff *skb,
2309 struct pcpu_secy_stats __percpu *pstats)
2310{
2311 struct macsec_dev_stats sum = {0, };
2312 int cpu;
2313
2314 for_each_possible_cpu(cpu) {
2315 const struct pcpu_secy_stats *stats;
2316 struct macsec_dev_stats tmp;
2317 unsigned int start;
2318
2319 stats = per_cpu_ptr(pstats, cpu);
2320 do {
2321 start = u64_stats_fetch_begin_irq(&stats->syncp);
2322 memcpy(&tmp, &stats->stats, sizeof(tmp));
2323 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2324
2325 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2326 sum.InPktsUntagged += tmp.InPktsUntagged;
2327 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2328 sum.InPktsNoTag += tmp.InPktsNoTag;
2329 sum.InPktsBadTag += tmp.InPktsBadTag;
2330 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2331 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2332 sum.InPktsOverrun += tmp.InPktsOverrun;
2333 }
2334
2335 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2336 sum.OutPktsUntagged,
2337 MACSEC_SECY_STATS_ATTR_PAD) ||
2338 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2339 sum.InPktsUntagged,
2340 MACSEC_SECY_STATS_ATTR_PAD) ||
2341 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2342 sum.OutPktsTooLong,
2343 MACSEC_SECY_STATS_ATTR_PAD) ||
2344 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2345 sum.InPktsNoTag,
2346 MACSEC_SECY_STATS_ATTR_PAD) ||
2347 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2348 sum.InPktsBadTag,
2349 MACSEC_SECY_STATS_ATTR_PAD) ||
2350 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2351 sum.InPktsUnknownSCI,
2352 MACSEC_SECY_STATS_ATTR_PAD) ||
2353 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2354 sum.InPktsNoSCI,
2355 MACSEC_SECY_STATS_ATTR_PAD) ||
2356 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2357 sum.InPktsOverrun,
2358 MACSEC_SECY_STATS_ATTR_PAD))
2359 return -EMSGSIZE;
2360
2361 return 0;
2362}
2363
2364static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2365{
2366 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2367 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2368 u64 csid;
2369
2370 if (!secy_nest)
2371 return 1;
2372
2373 switch (secy->key_len) {
2374 case MACSEC_GCM_AES_128_SAK_LEN:
2375 csid = MACSEC_DEFAULT_CIPHER_ID;
2376 break;
2377 case MACSEC_GCM_AES_256_SAK_LEN:
2378 csid = MACSEC_CIPHER_ID_GCM_AES_256;
2379 break;
2380 default:
2381 goto cancel;
2382 }
2383
2384 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2385 MACSEC_SECY_ATTR_PAD) ||
2386 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2387 csid, MACSEC_SECY_ATTR_PAD) ||
2388 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2389 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2390 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2391 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2392 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2393 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2394 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2395 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2396 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2397 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2398 goto cancel;
2399
2400 if (secy->replay_protect) {
2401 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2402 goto cancel;
2403 }
2404
2405 nla_nest_end(skb, secy_nest);
2406 return 0;
2407
2408cancel:
2409 nla_nest_cancel(skb, secy_nest);
2410 return 1;
2411}
2412
2413static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2414 struct sk_buff *skb, struct netlink_callback *cb)
2415{
2416 struct macsec_rx_sc *rx_sc;
2417 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2418 struct nlattr *txsa_list, *rxsc_list;
2419 int i, j;
2420 void *hdr;
2421 struct nlattr *attr;
2422
2423 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2424 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2425 if (!hdr)
2426 return -EMSGSIZE;
2427
2428 genl_dump_check_consistent(cb, hdr);
2429
2430 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2431 goto nla_put_failure;
2432
2433 if (nla_put_secy(secy, skb))
2434 goto nla_put_failure;
2435
2436 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2437 if (!attr)
2438 goto nla_put_failure;
2439 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2440 nla_nest_cancel(skb, attr);
2441 goto nla_put_failure;
2442 }
2443 nla_nest_end(skb, attr);
2444
2445 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2446 if (!attr)
2447 goto nla_put_failure;
2448 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2449 nla_nest_cancel(skb, attr);
2450 goto nla_put_failure;
2451 }
2452 nla_nest_end(skb, attr);
2453
2454 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2455 if (!txsa_list)
2456 goto nla_put_failure;
2457 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2458 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2459 struct nlattr *txsa_nest;
2460
2461 if (!tx_sa)
2462 continue;
2463
2464 txsa_nest = nla_nest_start(skb, j++);
2465 if (!txsa_nest) {
2466 nla_nest_cancel(skb, txsa_list);
2467 goto nla_put_failure;
2468 }
2469
2470 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2471 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2472 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
2473 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2474 nla_nest_cancel(skb, txsa_nest);
2475 nla_nest_cancel(skb, txsa_list);
2476 goto nla_put_failure;
2477 }
2478
2479 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2480 if (!attr) {
2481 nla_nest_cancel(skb, txsa_nest);
2482 nla_nest_cancel(skb, txsa_list);
2483 goto nla_put_failure;
2484 }
2485 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2486 nla_nest_cancel(skb, attr);
2487 nla_nest_cancel(skb, txsa_nest);
2488 nla_nest_cancel(skb, txsa_list);
2489 goto nla_put_failure;
2490 }
2491 nla_nest_end(skb, attr);
2492
2493 nla_nest_end(skb, txsa_nest);
2494 }
2495 nla_nest_end(skb, txsa_list);
2496
2497 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2498 if (!rxsc_list)
2499 goto nla_put_failure;
2500
2501 j = 1;
2502 for_each_rxsc_rtnl(secy, rx_sc) {
2503 int k;
2504 struct nlattr *rxsa_list;
2505 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2506
2507 if (!rxsc_nest) {
2508 nla_nest_cancel(skb, rxsc_list);
2509 goto nla_put_failure;
2510 }
2511
2512 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2513 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
2514 MACSEC_RXSC_ATTR_PAD)) {
2515 nla_nest_cancel(skb, rxsc_nest);
2516 nla_nest_cancel(skb, rxsc_list);
2517 goto nla_put_failure;
2518 }
2519
2520 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2521 if (!attr) {
2522 nla_nest_cancel(skb, rxsc_nest);
2523 nla_nest_cancel(skb, rxsc_list);
2524 goto nla_put_failure;
2525 }
2526 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2527 nla_nest_cancel(skb, attr);
2528 nla_nest_cancel(skb, rxsc_nest);
2529 nla_nest_cancel(skb, rxsc_list);
2530 goto nla_put_failure;
2531 }
2532 nla_nest_end(skb, attr);
2533
2534 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2535 if (!rxsa_list) {
2536 nla_nest_cancel(skb, rxsc_nest);
2537 nla_nest_cancel(skb, rxsc_list);
2538 goto nla_put_failure;
2539 }
2540
2541 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2542 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2543 struct nlattr *rxsa_nest;
2544
2545 if (!rx_sa)
2546 continue;
2547
2548 rxsa_nest = nla_nest_start(skb, k++);
2549 if (!rxsa_nest) {
2550 nla_nest_cancel(skb, rxsa_list);
2551 nla_nest_cancel(skb, rxsc_nest);
2552 nla_nest_cancel(skb, rxsc_list);
2553 goto nla_put_failure;
2554 }
2555
2556 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2557 if (!attr) {
2558 nla_nest_cancel(skb, rxsa_list);
2559 nla_nest_cancel(skb, rxsc_nest);
2560 nla_nest_cancel(skb, rxsc_list);
2561 goto nla_put_failure;
2562 }
2563 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2564 nla_nest_cancel(skb, attr);
2565 nla_nest_cancel(skb, rxsa_list);
2566 nla_nest_cancel(skb, rxsc_nest);
2567 nla_nest_cancel(skb, rxsc_list);
2568 goto nla_put_failure;
2569 }
2570 nla_nest_end(skb, attr);
2571
2572 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2573 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2574 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
2575 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2576 nla_nest_cancel(skb, rxsa_nest);
2577 nla_nest_cancel(skb, rxsc_nest);
2578 nla_nest_cancel(skb, rxsc_list);
2579 goto nla_put_failure;
2580 }
2581 nla_nest_end(skb, rxsa_nest);
2582 }
2583
2584 nla_nest_end(skb, rxsa_list);
2585 nla_nest_end(skb, rxsc_nest);
2586 }
2587
2588 nla_nest_end(skb, rxsc_list);
2589
2590 genlmsg_end(skb, hdr);
2591
2592 return 0;
2593
2594nla_put_failure:
2595 genlmsg_cancel(skb, hdr);
2596 return -EMSGSIZE;
2597}
2598
2599static int macsec_generation = 1; /* protected by RTNL */
2600
2601static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2602{
2603 struct net *net = sock_net(skb->sk);
2604 struct net_device *dev;
2605 int dev_idx, d;
2606
2607 dev_idx = cb->args[0];
2608
2609 d = 0;
2610 rtnl_lock();
2611
2612 cb->seq = macsec_generation;
2613
2614 for_each_netdev(net, dev) {
2615 struct macsec_secy *secy;
2616
2617 if (d < dev_idx)
2618 goto next;
2619
2620 if (!netif_is_macsec(dev))
2621 goto next;
2622
2623 secy = &macsec_priv(dev)->secy;
2624 if (dump_secy(secy, dev, skb, cb) < 0)
2625 goto done;
2626next:
2627 d++;
2628 }
2629
2630done:
2631 rtnl_unlock();
2632 cb->args[0] = d;
2633 return skb->len;
2634}
2635
2636static const struct genl_ops macsec_genl_ops[] = {
2637 {
2638 .cmd = MACSEC_CMD_GET_TXSC,
2639 .dumpit = macsec_dump_txsc,
2640 .policy = macsec_genl_policy,
2641 },
2642 {
2643 .cmd = MACSEC_CMD_ADD_RXSC,
2644 .doit = macsec_add_rxsc,
2645 .policy = macsec_genl_policy,
2646 .flags = GENL_ADMIN_PERM,
2647 },
2648 {
2649 .cmd = MACSEC_CMD_DEL_RXSC,
2650 .doit = macsec_del_rxsc,
2651 .policy = macsec_genl_policy,
2652 .flags = GENL_ADMIN_PERM,
2653 },
2654 {
2655 .cmd = MACSEC_CMD_UPD_RXSC,
2656 .doit = macsec_upd_rxsc,
2657 .policy = macsec_genl_policy,
2658 .flags = GENL_ADMIN_PERM,
2659 },
2660 {
2661 .cmd = MACSEC_CMD_ADD_TXSA,
2662 .doit = macsec_add_txsa,
2663 .policy = macsec_genl_policy,
2664 .flags = GENL_ADMIN_PERM,
2665 },
2666 {
2667 .cmd = MACSEC_CMD_DEL_TXSA,
2668 .doit = macsec_del_txsa,
2669 .policy = macsec_genl_policy,
2670 .flags = GENL_ADMIN_PERM,
2671 },
2672 {
2673 .cmd = MACSEC_CMD_UPD_TXSA,
2674 .doit = macsec_upd_txsa,
2675 .policy = macsec_genl_policy,
2676 .flags = GENL_ADMIN_PERM,
2677 },
2678 {
2679 .cmd = MACSEC_CMD_ADD_RXSA,
2680 .doit = macsec_add_rxsa,
2681 .policy = macsec_genl_policy,
2682 .flags = GENL_ADMIN_PERM,
2683 },
2684 {
2685 .cmd = MACSEC_CMD_DEL_RXSA,
2686 .doit = macsec_del_rxsa,
2687 .policy = macsec_genl_policy,
2688 .flags = GENL_ADMIN_PERM,
2689 },
2690 {
2691 .cmd = MACSEC_CMD_UPD_RXSA,
2692 .doit = macsec_upd_rxsa,
2693 .policy = macsec_genl_policy,
2694 .flags = GENL_ADMIN_PERM,
2695 },
2696};
2697
2698static struct genl_family macsec_fam __ro_after_init = {
2699 .name = MACSEC_GENL_NAME,
2700 .hdrsize = 0,
2701 .version = MACSEC_GENL_VERSION,
2702 .maxattr = MACSEC_ATTR_MAX,
2703 .netnsok = true,
2704 .module = THIS_MODULE,
2705 .ops = macsec_genl_ops,
2706 .n_ops = ARRAY_SIZE(macsec_genl_ops),
2707};
2708
2709static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2710 struct net_device *dev)
2711{
2712 struct macsec_dev *macsec = netdev_priv(dev);
2713 struct macsec_secy *secy = &macsec->secy;
2714 struct pcpu_secy_stats *secy_stats;
2715 int ret, len;
2716
2717 /* 10.5 */
2718 if (!secy->protect_frames) {
2719 secy_stats = this_cpu_ptr(macsec->stats);
2720 u64_stats_update_begin(&secy_stats->syncp);
2721 secy_stats->stats.OutPktsUntagged++;
2722 u64_stats_update_end(&secy_stats->syncp);
2723 skb->dev = macsec->real_dev;
2724 len = skb->len;
2725 ret = dev_queue_xmit(skb);
2726 count_tx(dev, ret, len);
2727 return ret;
2728 }
2729
2730 if (!secy->operational) {
2731 kfree_skb(skb);
2732 dev->stats.tx_dropped++;
2733 return NETDEV_TX_OK;
2734 }
2735
2736 skb = macsec_encrypt(skb, dev);
2737 if (IS_ERR(skb)) {
2738 if (PTR_ERR(skb) != -EINPROGRESS)
2739 dev->stats.tx_dropped++;
2740 return NETDEV_TX_OK;
2741 }
2742
2743 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2744
2745 macsec_encrypt_finish(skb, dev);
2746 len = skb->len;
2747 ret = dev_queue_xmit(skb);
2748 count_tx(dev, ret, len);
2749 return ret;
2750}
2751
2752#define MACSEC_FEATURES \
2753 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2754static struct lock_class_key macsec_netdev_addr_lock_key;
2755
2756static int macsec_dev_init(struct net_device *dev)
2757{
2758 struct macsec_dev *macsec = macsec_priv(dev);
2759 struct net_device *real_dev = macsec->real_dev;
2760 int err;
2761
2762 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2763 if (!dev->tstats)
2764 return -ENOMEM;
2765
2766 err = gro_cells_init(&macsec->gro_cells, dev);
2767 if (err) {
2768 free_percpu(dev->tstats);
2769 return err;
2770 }
2771
2772 dev->features = real_dev->features & MACSEC_FEATURES;
2773 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2774
2775 dev->needed_headroom = real_dev->needed_headroom +
2776 MACSEC_NEEDED_HEADROOM;
2777 dev->needed_tailroom = real_dev->needed_tailroom +
2778 MACSEC_NEEDED_TAILROOM;
2779
2780 if (is_zero_ether_addr(dev->dev_addr))
2781 eth_hw_addr_inherit(dev, real_dev);
2782 if (is_zero_ether_addr(dev->broadcast))
2783 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2784
2785 return 0;
2786}
2787
2788static void macsec_dev_uninit(struct net_device *dev)
2789{
2790 struct macsec_dev *macsec = macsec_priv(dev);
2791
2792 gro_cells_destroy(&macsec->gro_cells);
2793 free_percpu(dev->tstats);
2794}
2795
2796static netdev_features_t macsec_fix_features(struct net_device *dev,
2797 netdev_features_t features)
2798{
2799 struct macsec_dev *macsec = macsec_priv(dev);
2800 struct net_device *real_dev = macsec->real_dev;
2801
2802 features &= (real_dev->features & MACSEC_FEATURES) |
2803 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
2804 features |= NETIF_F_LLTX;
2805
2806 return features;
2807}
2808
2809static int macsec_dev_open(struct net_device *dev)
2810{
2811 struct macsec_dev *macsec = macsec_priv(dev);
2812 struct net_device *real_dev = macsec->real_dev;
2813 int err;
2814
2815 if (!(real_dev->flags & IFF_UP))
2816 return -ENETDOWN;
2817
2818 err = dev_uc_add(real_dev, dev->dev_addr);
2819 if (err < 0)
2820 return err;
2821
2822 if (dev->flags & IFF_ALLMULTI) {
2823 err = dev_set_allmulti(real_dev, 1);
2824 if (err < 0)
2825 goto del_unicast;
2826 }
2827
2828 if (dev->flags & IFF_PROMISC) {
2829 err = dev_set_promiscuity(real_dev, 1);
2830 if (err < 0)
2831 goto clear_allmulti;
2832 }
2833
2834 if (netif_carrier_ok(real_dev))
2835 netif_carrier_on(dev);
2836
2837 return 0;
2838clear_allmulti:
2839 if (dev->flags & IFF_ALLMULTI)
2840 dev_set_allmulti(real_dev, -1);
2841del_unicast:
2842 dev_uc_del(real_dev, dev->dev_addr);
2843 netif_carrier_off(dev);
2844 return err;
2845}
2846
2847static int macsec_dev_stop(struct net_device *dev)
2848{
2849 struct macsec_dev *macsec = macsec_priv(dev);
2850 struct net_device *real_dev = macsec->real_dev;
2851
2852 netif_carrier_off(dev);
2853
2854 dev_mc_unsync(real_dev, dev);
2855 dev_uc_unsync(real_dev, dev);
2856
2857 if (dev->flags & IFF_ALLMULTI)
2858 dev_set_allmulti(real_dev, -1);
2859
2860 if (dev->flags & IFF_PROMISC)
2861 dev_set_promiscuity(real_dev, -1);
2862
2863 dev_uc_del(real_dev, dev->dev_addr);
2864
2865 return 0;
2866}
2867
2868static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2869{
2870 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2871
2872 if (!(dev->flags & IFF_UP))
2873 return;
2874
2875 if (change & IFF_ALLMULTI)
2876 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2877
2878 if (change & IFF_PROMISC)
2879 dev_set_promiscuity(real_dev,
2880 dev->flags & IFF_PROMISC ? 1 : -1);
2881}
2882
2883static void macsec_dev_set_rx_mode(struct net_device *dev)
2884{
2885 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2886
2887 dev_mc_sync(real_dev, dev);
2888 dev_uc_sync(real_dev, dev);
2889}
2890
2891static int macsec_set_mac_address(struct net_device *dev, void *p)
2892{
2893 struct macsec_dev *macsec = macsec_priv(dev);
2894 struct net_device *real_dev = macsec->real_dev;
2895 struct sockaddr *addr = p;
2896 int err;
2897
2898 if (!is_valid_ether_addr(addr->sa_data))
2899 return -EADDRNOTAVAIL;
2900
2901 if (!(dev->flags & IFF_UP))
2902 goto out;
2903
2904 err = dev_uc_add(real_dev, addr->sa_data);
2905 if (err < 0)
2906 return err;
2907
2908 dev_uc_del(real_dev, dev->dev_addr);
2909
2910out:
2911 ether_addr_copy(dev->dev_addr, addr->sa_data);
2912 return 0;
2913}
2914
2915static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2916{
2917 struct macsec_dev *macsec = macsec_priv(dev);
2918 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2919
2920 if (macsec->real_dev->mtu - extra < new_mtu)
2921 return -ERANGE;
2922
2923 dev->mtu = new_mtu;
2924
2925 return 0;
2926}
2927
2928static void macsec_get_stats64(struct net_device *dev,
2929 struct rtnl_link_stats64 *s)
2930{
2931 int cpu;
2932
2933 if (!dev->tstats)
2934 return;
2935
2936 for_each_possible_cpu(cpu) {
2937 struct pcpu_sw_netstats *stats;
2938 struct pcpu_sw_netstats tmp;
2939 int start;
2940
2941 stats = per_cpu_ptr(dev->tstats, cpu);
2942 do {
2943 start = u64_stats_fetch_begin_irq(&stats->syncp);
2944 tmp.rx_packets = stats->rx_packets;
2945 tmp.rx_bytes = stats->rx_bytes;
2946 tmp.tx_packets = stats->tx_packets;
2947 tmp.tx_bytes = stats->tx_bytes;
2948 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2949
2950 s->rx_packets += tmp.rx_packets;
2951 s->rx_bytes += tmp.rx_bytes;
2952 s->tx_packets += tmp.tx_packets;
2953 s->tx_bytes += tmp.tx_bytes;
2954 }
2955
2956 s->rx_dropped = dev->stats.rx_dropped;
2957 s->tx_dropped = dev->stats.tx_dropped;
2958}
2959
2960static int macsec_get_iflink(const struct net_device *dev)
2961{
2962 return macsec_priv(dev)->real_dev->ifindex;
2963}
2964
2965
2966static int macsec_get_nest_level(struct net_device *dev)
2967{
2968 return macsec_priv(dev)->nest_level;
2969}
2970
2971
2972static const struct net_device_ops macsec_netdev_ops = {
2973 .ndo_init = macsec_dev_init,
2974 .ndo_uninit = macsec_dev_uninit,
2975 .ndo_open = macsec_dev_open,
2976 .ndo_stop = macsec_dev_stop,
2977 .ndo_fix_features = macsec_fix_features,
2978 .ndo_change_mtu = macsec_change_mtu,
2979 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2980 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2981 .ndo_set_mac_address = macsec_set_mac_address,
2982 .ndo_start_xmit = macsec_start_xmit,
2983 .ndo_get_stats64 = macsec_get_stats64,
2984 .ndo_get_iflink = macsec_get_iflink,
2985 .ndo_get_lock_subclass = macsec_get_nest_level,
2986};
2987
2988static const struct device_type macsec_type = {
2989 .name = "macsec",
2990};
2991
2992static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2993 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2994 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2995 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2996 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2997 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2998 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2999 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3000 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3001 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3002 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3003 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3004 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3005};
3006
3007static void macsec_free_netdev(struct net_device *dev)
3008{
3009 struct macsec_dev *macsec = macsec_priv(dev);
3010 struct net_device *real_dev = macsec->real_dev;
3011
3012 free_percpu(macsec->stats);
3013 free_percpu(macsec->secy.tx_sc.stats);
3014
3015 dev_put(real_dev);
3016}
3017
3018static void macsec_setup(struct net_device *dev)
3019{
3020 ether_setup(dev);
3021 dev->min_mtu = 0;
3022 dev->max_mtu = ETH_MAX_MTU;
3023 dev->priv_flags |= IFF_NO_QUEUE;
3024 dev->netdev_ops = &macsec_netdev_ops;
3025 dev->needs_free_netdev = true;
3026 dev->priv_destructor = macsec_free_netdev;
3027 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3028
3029 eth_zero_addr(dev->broadcast);
3030}
3031
3032static int macsec_changelink_common(struct net_device *dev,
3033 struct nlattr *data[])
3034{
3035 struct macsec_secy *secy;
3036 struct macsec_tx_sc *tx_sc;
3037
3038 secy = &macsec_priv(dev)->secy;
3039 tx_sc = &secy->tx_sc;
3040
3041 if (data[IFLA_MACSEC_ENCODING_SA]) {
3042 struct macsec_tx_sa *tx_sa;
3043
3044 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3045 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3046
3047 secy->operational = tx_sa && tx_sa->active;
3048 }
3049
3050 if (data[IFLA_MACSEC_WINDOW])
3051 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3052
3053 if (data[IFLA_MACSEC_ENCRYPT])
3054 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3055
3056 if (data[IFLA_MACSEC_PROTECT])
3057 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3058
3059 if (data[IFLA_MACSEC_INC_SCI])
3060 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3061
3062 if (data[IFLA_MACSEC_ES])
3063 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3064
3065 if (data[IFLA_MACSEC_SCB])
3066 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3067
3068 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3069 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3070
3071 if (data[IFLA_MACSEC_VALIDATION])
3072 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3073
3074 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3075 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3076 case MACSEC_CIPHER_ID_GCM_AES_128:
3077 case MACSEC_DEFAULT_CIPHER_ID:
3078 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3079 break;
3080 case MACSEC_CIPHER_ID_GCM_AES_256:
3081 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3082 break;
3083 default:
3084 return -EINVAL;
3085 }
3086 }
3087
3088 return 0;
3089}
3090
3091static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3092 struct nlattr *data[],
3093 struct netlink_ext_ack *extack)
3094{
3095 if (!data)
3096 return 0;
3097
3098 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3099 data[IFLA_MACSEC_ICV_LEN] ||
3100 data[IFLA_MACSEC_SCI] ||
3101 data[IFLA_MACSEC_PORT])
3102 return -EINVAL;
3103
3104 return macsec_changelink_common(dev, data);
3105}
3106
3107static void macsec_del_dev(struct macsec_dev *macsec)
3108{
3109 int i;
3110
3111 while (macsec->secy.rx_sc) {
3112 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3113
3114 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3115 free_rx_sc(rx_sc);
3116 }
3117
3118 for (i = 0; i < MACSEC_NUM_AN; i++) {
3119 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3120
3121 if (sa) {
3122 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3123 clear_tx_sa(sa);
3124 }
3125 }
3126}
3127
3128static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3129{
3130 struct macsec_dev *macsec = macsec_priv(dev);
3131 struct net_device *real_dev = macsec->real_dev;
3132
3133 unregister_netdevice_queue(dev, head);
3134 list_del_rcu(&macsec->secys);
3135 macsec_del_dev(macsec);
3136 netdev_upper_dev_unlink(real_dev, dev);
3137
3138 macsec_generation++;
3139}
3140
3141static void macsec_dellink(struct net_device *dev, struct list_head *head)
3142{
3143 struct macsec_dev *macsec = macsec_priv(dev);
3144 struct net_device *real_dev = macsec->real_dev;
3145 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3146
3147 macsec_common_dellink(dev, head);
3148
3149 if (list_empty(&rxd->secys)) {
3150 netdev_rx_handler_unregister(real_dev);
3151 kfree(rxd);
3152 }
3153}
3154
3155static int register_macsec_dev(struct net_device *real_dev,
3156 struct net_device *dev)
3157{
3158 struct macsec_dev *macsec = macsec_priv(dev);
3159 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3160
3161 if (!rxd) {
3162 int err;
3163
3164 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3165 if (!rxd)
3166 return -ENOMEM;
3167
3168 INIT_LIST_HEAD(&rxd->secys);
3169
3170 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3171 rxd);
3172 if (err < 0) {
3173 kfree(rxd);
3174 return err;
3175 }
3176 }
3177
3178 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3179 return 0;
3180}
3181
3182static bool sci_exists(struct net_device *dev, sci_t sci)
3183{
3184 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3185 struct macsec_dev *macsec;
3186
3187 list_for_each_entry(macsec, &rxd->secys, secys) {
3188 if (macsec->secy.sci == sci)
3189 return true;
3190 }
3191
3192 return false;
3193}
3194
3195static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3196{
3197 return make_sci(dev->dev_addr, port);
3198}
3199
3200static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3201{
3202 struct macsec_dev *macsec = macsec_priv(dev);
3203 struct macsec_secy *secy = &macsec->secy;
3204
3205 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3206 if (!macsec->stats)
3207 return -ENOMEM;
3208
3209 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3210 if (!secy->tx_sc.stats) {
3211 free_percpu(macsec->stats);
3212 return -ENOMEM;
3213 }
3214
3215 if (sci == MACSEC_UNDEF_SCI)
3216 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3217
3218 secy->netdev = dev;
3219 secy->operational = true;
3220 secy->key_len = DEFAULT_SAK_LEN;
3221 secy->icv_len = icv_len;
3222 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3223 secy->protect_frames = true;
3224 secy->replay_protect = false;
3225
3226 secy->sci = sci;
3227 secy->tx_sc.active = true;
3228 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3229 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3230 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3231 secy->tx_sc.end_station = false;
3232 secy->tx_sc.scb = false;
3233
3234 return 0;
3235}
3236
3237static int macsec_newlink(struct net *net, struct net_device *dev,
3238 struct nlattr *tb[], struct nlattr *data[],
3239 struct netlink_ext_ack *extack)
3240{
3241 struct macsec_dev *macsec = macsec_priv(dev);
3242 struct net_device *real_dev;
3243 int err;
3244 sci_t sci;
3245 u8 icv_len = DEFAULT_ICV_LEN;
3246 rx_handler_func_t *rx_handler;
3247
3248 if (!tb[IFLA_LINK])
3249 return -EINVAL;
3250 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3251 if (!real_dev)
3252 return -ENODEV;
3253
3254 dev->priv_flags |= IFF_MACSEC;
3255
3256 macsec->real_dev = real_dev;
3257
3258 if (data && data[IFLA_MACSEC_ICV_LEN])
3259 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3260 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3261
3262 rx_handler = rtnl_dereference(real_dev->rx_handler);
3263 if (rx_handler && rx_handler != macsec_handle_frame)
3264 return -EBUSY;
3265
3266 err = register_netdevice(dev);
3267 if (err < 0)
3268 return err;
3269
3270 dev_hold(real_dev);
3271
3272 macsec->nest_level = dev_get_nest_level(real_dev) + 1;
3273 netdev_lockdep_set_classes(dev);
3274 lockdep_set_class_and_subclass(&dev->addr_list_lock,
3275 &macsec_netdev_addr_lock_key,
3276 macsec_get_nest_level(dev));
3277
3278 err = netdev_upper_dev_link(real_dev, dev, extack);
3279 if (err < 0)
3280 goto unregister;
3281
3282 /* need to be already registered so that ->init has run and
3283 * the MAC addr is set
3284 */
3285 if (data && data[IFLA_MACSEC_SCI])
3286 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3287 else if (data && data[IFLA_MACSEC_PORT])
3288 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3289 else
3290 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3291
3292 if (rx_handler && sci_exists(real_dev, sci)) {
3293 err = -EBUSY;
3294 goto unlink;
3295 }
3296
3297 err = macsec_add_dev(dev, sci, icv_len);
3298 if (err)
3299 goto unlink;
3300
3301 if (data) {
3302 err = macsec_changelink_common(dev, data);
3303 if (err)
3304 goto del_dev;
3305 }
3306
3307 err = register_macsec_dev(real_dev, dev);
3308 if (err < 0)
3309 goto del_dev;
3310
3311 macsec_generation++;
3312
3313 return 0;
3314
3315del_dev:
3316 macsec_del_dev(macsec);
3317unlink:
3318 netdev_upper_dev_unlink(real_dev, dev);
3319unregister:
3320 unregister_netdevice(dev);
3321 return err;
3322}
3323
3324static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
3325 struct netlink_ext_ack *extack)
3326{
3327 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
3328 u8 icv_len = DEFAULT_ICV_LEN;
3329 int flag;
3330 bool es, scb, sci;
3331
3332 if (!data)
3333 return 0;
3334
3335 if (data[IFLA_MACSEC_CIPHER_SUITE])
3336 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3337
3338 if (data[IFLA_MACSEC_ICV_LEN]) {
3339 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3340 if (icv_len != DEFAULT_ICV_LEN) {
3341 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
3342 struct crypto_aead *dummy_tfm;
3343
3344 dummy_tfm = macsec_alloc_tfm(dummy_key,
3345 DEFAULT_SAK_LEN,
3346 icv_len);
3347 if (IS_ERR(dummy_tfm))
3348 return PTR_ERR(dummy_tfm);
3349 crypto_free_aead(dummy_tfm);
3350 }
3351 }
3352
3353 switch (csid) {
3354 case MACSEC_CIPHER_ID_GCM_AES_128:
3355 case MACSEC_CIPHER_ID_GCM_AES_256:
3356 case MACSEC_DEFAULT_CIPHER_ID:
3357 if (icv_len < MACSEC_MIN_ICV_LEN ||
3358 icv_len > MACSEC_STD_ICV_LEN)
3359 return -EINVAL;
3360 break;
3361 default:
3362 return -EINVAL;
3363 }
3364
3365 if (data[IFLA_MACSEC_ENCODING_SA]) {
3366 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3367 return -EINVAL;
3368 }
3369
3370 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3371 flag < IFLA_MACSEC_VALIDATION;
3372 flag++) {
3373 if (data[flag]) {
3374 if (nla_get_u8(data[flag]) > 1)
3375 return -EINVAL;
3376 }
3377 }
3378
3379 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3380 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3381 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3382
3383 if ((sci && (scb || es)) || (scb && es))
3384 return -EINVAL;
3385
3386 if (data[IFLA_MACSEC_VALIDATION] &&
3387 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3388 return -EINVAL;
3389
3390 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
3391 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
3392 !data[IFLA_MACSEC_WINDOW])
3393 return -EINVAL;
3394
3395 return 0;
3396}
3397
3398static struct net *macsec_get_link_net(const struct net_device *dev)
3399{
3400 return dev_net(macsec_priv(dev)->real_dev);
3401}
3402
3403static size_t macsec_get_size(const struct net_device *dev)
3404{
3405 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
3406 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
3407 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
3408 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
3409 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
3410 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
3411 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
3412 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
3413 nla_total_size(1) + /* IFLA_MACSEC_ES */
3414 nla_total_size(1) + /* IFLA_MACSEC_SCB */
3415 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
3416 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
3417 0;
3418}
3419
3420static int macsec_fill_info(struct sk_buff *skb,
3421 const struct net_device *dev)
3422{
3423 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3424 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3425 u64 csid;
3426
3427 switch (secy->key_len) {
3428 case MACSEC_GCM_AES_128_SAK_LEN:
3429 csid = MACSEC_DEFAULT_CIPHER_ID;
3430 break;
3431 case MACSEC_GCM_AES_256_SAK_LEN:
3432 csid = MACSEC_CIPHER_ID_GCM_AES_256;
3433 break;
3434 default:
3435 goto nla_put_failure;
3436 }
3437
3438 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
3439 IFLA_MACSEC_PAD) ||
3440 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3441 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
3442 csid, IFLA_MACSEC_PAD) ||
3443 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3444 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3445 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3446 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3447 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3448 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3449 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3450 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3451 0)
3452 goto nla_put_failure;
3453
3454 if (secy->replay_protect) {
3455 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3456 goto nla_put_failure;
3457 }
3458
3459 return 0;
3460
3461nla_put_failure:
3462 return -EMSGSIZE;
3463}
3464
3465static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3466 .kind = "macsec",
3467 .priv_size = sizeof(struct macsec_dev),
3468 .maxtype = IFLA_MACSEC_MAX,
3469 .policy = macsec_rtnl_policy,
3470 .setup = macsec_setup,
3471 .validate = macsec_validate_attr,
3472 .newlink = macsec_newlink,
3473 .changelink = macsec_changelink,
3474 .dellink = macsec_dellink,
3475 .get_size = macsec_get_size,
3476 .fill_info = macsec_fill_info,
3477 .get_link_net = macsec_get_link_net,
3478};
3479
3480static bool is_macsec_master(struct net_device *dev)
3481{
3482 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3483}
3484
3485static int macsec_notify(struct notifier_block *this, unsigned long event,
3486 void *ptr)
3487{
3488 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3489 LIST_HEAD(head);
3490
3491 if (!is_macsec_master(real_dev))
3492 return NOTIFY_DONE;
3493
3494 switch (event) {
3495 case NETDEV_UNREGISTER: {
3496 struct macsec_dev *m, *n;
3497 struct macsec_rxh_data *rxd;
3498
3499 rxd = macsec_data_rtnl(real_dev);
3500 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3501 macsec_common_dellink(m->secy.netdev, &head);
3502 }
3503
3504 netdev_rx_handler_unregister(real_dev);
3505 kfree(rxd);
3506
3507 unregister_netdevice_many(&head);
3508 break;
3509 }
3510 case NETDEV_CHANGEMTU: {
3511 struct macsec_dev *m;
3512 struct macsec_rxh_data *rxd;
3513
3514 rxd = macsec_data_rtnl(real_dev);
3515 list_for_each_entry(m, &rxd->secys, secys) {
3516 struct net_device *dev = m->secy.netdev;
3517 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3518 macsec_extra_len(true));
3519
3520 if (dev->mtu > mtu)
3521 dev_set_mtu(dev, mtu);
3522 }
3523 }
3524 }
3525
3526 return NOTIFY_OK;
3527}
3528
3529static struct notifier_block macsec_notifier = {
3530 .notifier_call = macsec_notify,
3531};
3532
3533static int __init macsec_init(void)
3534{
3535 int err;
3536
3537 pr_info("MACsec IEEE 802.1AE\n");
3538 err = register_netdevice_notifier(&macsec_notifier);
3539 if (err)
3540 return err;
3541
3542 err = rtnl_link_register(&macsec_link_ops);
3543 if (err)
3544 goto notifier;
3545
3546 err = genl_register_family(&macsec_fam);
3547 if (err)
3548 goto rtnl;
3549
3550 return 0;
3551
3552rtnl:
3553 rtnl_link_unregister(&macsec_link_ops);
3554notifier:
3555 unregister_netdevice_notifier(&macsec_notifier);
3556 return err;
3557}
3558
3559static void __exit macsec_exit(void)
3560{
3561 genl_unregister_family(&macsec_fam);
3562 rtnl_link_unregister(&macsec_link_ops);
3563 unregister_netdevice_notifier(&macsec_notifier);
3564 rcu_barrier();
3565}
3566
3567module_init(macsec_init);
3568module_exit(macsec_exit);
3569
3570MODULE_ALIAS_RTNL_LINK("macsec");
3571MODULE_ALIAS_GENL_FAMILY("macsec");
3572
3573MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3574MODULE_LICENSE("GPL v2");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * drivers/net/macsec.c - MACsec device
4 *
5 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
6 */
7
8#include <linux/types.h>
9#include <linux/skbuff.h>
10#include <linux/socket.h>
11#include <linux/module.h>
12#include <crypto/aead.h>
13#include <linux/etherdevice.h>
14#include <linux/netdevice.h>
15#include <linux/rtnetlink.h>
16#include <linux/refcount.h>
17#include <net/genetlink.h>
18#include <net/sock.h>
19#include <net/gro_cells.h>
20#include <net/macsec.h>
21#include <linux/phy.h>
22#include <linux/byteorder/generic.h>
23#include <linux/if_arp.h>
24
25#include <uapi/linux/if_macsec.h>
26
27#define MACSEC_SCI_LEN 8
28
29/* SecTAG length = macsec_eth_header without the optional SCI */
30#define MACSEC_TAG_LEN 6
31
32struct macsec_eth_header {
33 struct ethhdr eth;
34 /* SecTAG */
35 u8 tci_an;
36#if defined(__LITTLE_ENDIAN_BITFIELD)
37 u8 short_length:6,
38 unused:2;
39#elif defined(__BIG_ENDIAN_BITFIELD)
40 u8 unused:2,
41 short_length:6;
42#else
43#error "Please fix <asm/byteorder.h>"
44#endif
45 __be32 packet_number;
46 u8 secure_channel_id[8]; /* optional */
47} __packed;
48
49#define MACSEC_TCI_VERSION 0x80
50#define MACSEC_TCI_ES 0x40 /* end station */
51#define MACSEC_TCI_SC 0x20 /* SCI present */
52#define MACSEC_TCI_SCB 0x10 /* epon */
53#define MACSEC_TCI_E 0x08 /* encryption */
54#define MACSEC_TCI_C 0x04 /* changed text */
55#define MACSEC_AN_MASK 0x03 /* association number */
56#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
57
58/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
59#define MIN_NON_SHORT_LEN 48
60
61#define GCM_AES_IV_LEN 12
62#define DEFAULT_ICV_LEN 16
63
64#define for_each_rxsc(secy, sc) \
65 for (sc = rcu_dereference_bh(secy->rx_sc); \
66 sc; \
67 sc = rcu_dereference_bh(sc->next))
68#define for_each_rxsc_rtnl(secy, sc) \
69 for (sc = rtnl_dereference(secy->rx_sc); \
70 sc; \
71 sc = rtnl_dereference(sc->next))
72
73#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
74
75struct gcm_iv_xpn {
76 union {
77 u8 short_secure_channel_id[4];
78 ssci_t ssci;
79 };
80 __be64 pn;
81} __packed;
82
83struct gcm_iv {
84 union {
85 u8 secure_channel_id[8];
86 sci_t sci;
87 };
88 __be32 pn;
89};
90
91#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
92
93struct pcpu_secy_stats {
94 struct macsec_dev_stats stats;
95 struct u64_stats_sync syncp;
96};
97
98/**
99 * struct macsec_dev - private data
100 * @secy: SecY config
101 * @real_dev: pointer to underlying netdevice
102 * @stats: MACsec device stats
103 * @secys: linked list of SecY's on the underlying device
104 * @offload: status of offloading on the MACsec device
105 */
106struct macsec_dev {
107 struct macsec_secy secy;
108 struct net_device *real_dev;
109 struct pcpu_secy_stats __percpu *stats;
110 struct list_head secys;
111 struct gro_cells gro_cells;
112 enum macsec_offload offload;
113};
114
115/**
116 * struct macsec_rxh_data - rx_handler private argument
117 * @secys: linked list of SecY's on this underlying device
118 */
119struct macsec_rxh_data {
120 struct list_head secys;
121};
122
123static struct macsec_dev *macsec_priv(const struct net_device *dev)
124{
125 return (struct macsec_dev *)netdev_priv(dev);
126}
127
128static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
129{
130 return rcu_dereference_bh(dev->rx_handler_data);
131}
132
133static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
134{
135 return rtnl_dereference(dev->rx_handler_data);
136}
137
138struct macsec_cb {
139 struct aead_request *req;
140 union {
141 struct macsec_tx_sa *tx_sa;
142 struct macsec_rx_sa *rx_sa;
143 };
144 u8 assoc_num;
145 bool valid;
146 bool has_sci;
147};
148
149static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
150{
151 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
152
153 if (!sa || !sa->active)
154 return NULL;
155
156 if (!refcount_inc_not_zero(&sa->refcnt))
157 return NULL;
158
159 return sa;
160}
161
162static void free_rx_sc_rcu(struct rcu_head *head)
163{
164 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
165
166 free_percpu(rx_sc->stats);
167 kfree(rx_sc);
168}
169
170static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
171{
172 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
173}
174
175static void macsec_rxsc_put(struct macsec_rx_sc *sc)
176{
177 if (refcount_dec_and_test(&sc->refcnt))
178 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
179}
180
181static void free_rxsa(struct rcu_head *head)
182{
183 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
184
185 crypto_free_aead(sa->key.tfm);
186 free_percpu(sa->stats);
187 kfree(sa);
188}
189
190static void macsec_rxsa_put(struct macsec_rx_sa *sa)
191{
192 if (refcount_dec_and_test(&sa->refcnt))
193 call_rcu(&sa->rcu, free_rxsa);
194}
195
196static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
197{
198 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
199
200 if (!sa || !sa->active)
201 return NULL;
202
203 if (!refcount_inc_not_zero(&sa->refcnt))
204 return NULL;
205
206 return sa;
207}
208
209static void free_txsa(struct rcu_head *head)
210{
211 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
212
213 crypto_free_aead(sa->key.tfm);
214 free_percpu(sa->stats);
215 kfree(sa);
216}
217
218static void macsec_txsa_put(struct macsec_tx_sa *sa)
219{
220 if (refcount_dec_and_test(&sa->refcnt))
221 call_rcu(&sa->rcu, free_txsa);
222}
223
224static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
225{
226 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
227 return (struct macsec_cb *)skb->cb;
228}
229
230#define MACSEC_PORT_ES (htons(0x0001))
231#define MACSEC_PORT_SCB (0x0000)
232#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
233#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
234
235#define MACSEC_GCM_AES_128_SAK_LEN 16
236#define MACSEC_GCM_AES_256_SAK_LEN 32
237
238#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
239#define DEFAULT_XPN false
240#define DEFAULT_SEND_SCI true
241#define DEFAULT_ENCRYPT false
242#define DEFAULT_ENCODING_SA 0
243
244static bool send_sci(const struct macsec_secy *secy)
245{
246 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
247
248 return tx_sc->send_sci ||
249 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb);
250}
251
252static sci_t make_sci(u8 *addr, __be16 port)
253{
254 sci_t sci;
255
256 memcpy(&sci, addr, ETH_ALEN);
257 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
258
259 return sci;
260}
261
262static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
263{
264 sci_t sci;
265
266 if (sci_present)
267 memcpy(&sci, hdr->secure_channel_id,
268 sizeof(hdr->secure_channel_id));
269 else
270 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
271
272 return sci;
273}
274
275static unsigned int macsec_sectag_len(bool sci_present)
276{
277 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
278}
279
280static unsigned int macsec_hdr_len(bool sci_present)
281{
282 return macsec_sectag_len(sci_present) + ETH_HLEN;
283}
284
285static unsigned int macsec_extra_len(bool sci_present)
286{
287 return macsec_sectag_len(sci_present) + sizeof(__be16);
288}
289
290/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
291static void macsec_fill_sectag(struct macsec_eth_header *h,
292 const struct macsec_secy *secy, u32 pn,
293 bool sci_present)
294{
295 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
296
297 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
298 h->eth.h_proto = htons(ETH_P_MACSEC);
299
300 if (sci_present) {
301 h->tci_an |= MACSEC_TCI_SC;
302 memcpy(&h->secure_channel_id, &secy->sci,
303 sizeof(h->secure_channel_id));
304 } else {
305 if (tx_sc->end_station)
306 h->tci_an |= MACSEC_TCI_ES;
307 if (tx_sc->scb)
308 h->tci_an |= MACSEC_TCI_SCB;
309 }
310
311 h->packet_number = htonl(pn);
312
313 /* with GCM, C/E clear for !encrypt, both set for encrypt */
314 if (tx_sc->encrypt)
315 h->tci_an |= MACSEC_TCI_CONFID;
316 else if (secy->icv_len != DEFAULT_ICV_LEN)
317 h->tci_an |= MACSEC_TCI_C;
318
319 h->tci_an |= tx_sc->encoding_sa;
320}
321
322static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
323{
324 if (data_len < MIN_NON_SHORT_LEN)
325 h->short_length = data_len;
326}
327
328/* Checks if a MACsec interface is being offloaded to an hardware engine */
329static bool macsec_is_offloaded(struct macsec_dev *macsec)
330{
331 if (macsec->offload == MACSEC_OFFLOAD_MAC ||
332 macsec->offload == MACSEC_OFFLOAD_PHY)
333 return true;
334
335 return false;
336}
337
338/* Checks if underlying layers implement MACsec offloading functions. */
339static bool macsec_check_offload(enum macsec_offload offload,
340 struct macsec_dev *macsec)
341{
342 if (!macsec || !macsec->real_dev)
343 return false;
344
345 if (offload == MACSEC_OFFLOAD_PHY)
346 return macsec->real_dev->phydev &&
347 macsec->real_dev->phydev->macsec_ops;
348 else if (offload == MACSEC_OFFLOAD_MAC)
349 return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
350 macsec->real_dev->macsec_ops;
351
352 return false;
353}
354
355static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
356 struct macsec_dev *macsec,
357 struct macsec_context *ctx)
358{
359 if (ctx) {
360 memset(ctx, 0, sizeof(*ctx));
361 ctx->offload = offload;
362
363 if (offload == MACSEC_OFFLOAD_PHY)
364 ctx->phydev = macsec->real_dev->phydev;
365 else if (offload == MACSEC_OFFLOAD_MAC)
366 ctx->netdev = macsec->real_dev;
367 }
368
369 if (offload == MACSEC_OFFLOAD_PHY)
370 return macsec->real_dev->phydev->macsec_ops;
371 else
372 return macsec->real_dev->macsec_ops;
373}
374
375/* Returns a pointer to the MACsec ops struct if any and updates the MACsec
376 * context device reference if provided.
377 */
378static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
379 struct macsec_context *ctx)
380{
381 if (!macsec_check_offload(macsec->offload, macsec))
382 return NULL;
383
384 return __macsec_get_ops(macsec->offload, macsec, ctx);
385}
386
387/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
388static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
389{
390 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
391 int len = skb->len - 2 * ETH_ALEN;
392 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
393
394 /* a) It comprises at least 17 octets */
395 if (skb->len <= 16)
396 return false;
397
398 /* b) MACsec EtherType: already checked */
399
400 /* c) V bit is clear */
401 if (h->tci_an & MACSEC_TCI_VERSION)
402 return false;
403
404 /* d) ES or SCB => !SC */
405 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
406 (h->tci_an & MACSEC_TCI_SC))
407 return false;
408
409 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
410 if (h->unused)
411 return false;
412
413 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
414 if (!h->packet_number && !xpn)
415 return false;
416
417 /* length check, f) g) h) i) */
418 if (h->short_length)
419 return len == extra_len + h->short_length;
420 return len >= extra_len + MIN_NON_SHORT_LEN;
421}
422
423#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
424#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
425
426static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
427 salt_t salt)
428{
429 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
430
431 gcm_iv->ssci = ssci ^ salt.ssci;
432 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
433}
434
435static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
436{
437 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
438
439 gcm_iv->sci = sci;
440 gcm_iv->pn = htonl(pn);
441}
442
443static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
444{
445 return (struct macsec_eth_header *)skb_mac_header(skb);
446}
447
448static sci_t dev_to_sci(struct net_device *dev, __be16 port)
449{
450 return make_sci(dev->dev_addr, port);
451}
452
453static void __macsec_pn_wrapped(struct macsec_secy *secy,
454 struct macsec_tx_sa *tx_sa)
455{
456 pr_debug("PN wrapped, transitioning to !oper\n");
457 tx_sa->active = false;
458 if (secy->protect_frames)
459 secy->operational = false;
460}
461
462void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
463{
464 spin_lock_bh(&tx_sa->lock);
465 __macsec_pn_wrapped(secy, tx_sa);
466 spin_unlock_bh(&tx_sa->lock);
467}
468EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
469
470static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
471 struct macsec_secy *secy)
472{
473 pn_t pn;
474
475 spin_lock_bh(&tx_sa->lock);
476
477 pn = tx_sa->next_pn_halves;
478 if (secy->xpn)
479 tx_sa->next_pn++;
480 else
481 tx_sa->next_pn_halves.lower++;
482
483 if (tx_sa->next_pn == 0)
484 __macsec_pn_wrapped(secy, tx_sa);
485 spin_unlock_bh(&tx_sa->lock);
486
487 return pn;
488}
489
490static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
491{
492 struct macsec_dev *macsec = netdev_priv(dev);
493
494 skb->dev = macsec->real_dev;
495 skb_reset_mac_header(skb);
496 skb->protocol = eth_hdr(skb)->h_proto;
497}
498
499static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
500 struct macsec_tx_sa *tx_sa)
501{
502 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
503
504 u64_stats_update_begin(&txsc_stats->syncp);
505 if (tx_sc->encrypt) {
506 txsc_stats->stats.OutOctetsEncrypted += skb->len;
507 txsc_stats->stats.OutPktsEncrypted++;
508 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
509 } else {
510 txsc_stats->stats.OutOctetsProtected += skb->len;
511 txsc_stats->stats.OutPktsProtected++;
512 this_cpu_inc(tx_sa->stats->OutPktsProtected);
513 }
514 u64_stats_update_end(&txsc_stats->syncp);
515}
516
517static void count_tx(struct net_device *dev, int ret, int len)
518{
519 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
520 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
521
522 u64_stats_update_begin(&stats->syncp);
523 stats->tx_packets++;
524 stats->tx_bytes += len;
525 u64_stats_update_end(&stats->syncp);
526 }
527}
528
529static void macsec_encrypt_done(struct crypto_async_request *base, int err)
530{
531 struct sk_buff *skb = base->data;
532 struct net_device *dev = skb->dev;
533 struct macsec_dev *macsec = macsec_priv(dev);
534 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
535 int len, ret;
536
537 aead_request_free(macsec_skb_cb(skb)->req);
538
539 rcu_read_lock_bh();
540 macsec_encrypt_finish(skb, dev);
541 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
542 len = skb->len;
543 ret = dev_queue_xmit(skb);
544 count_tx(dev, ret, len);
545 rcu_read_unlock_bh();
546
547 macsec_txsa_put(sa);
548 dev_put(dev);
549}
550
551static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
552 unsigned char **iv,
553 struct scatterlist **sg,
554 int num_frags)
555{
556 size_t size, iv_offset, sg_offset;
557 struct aead_request *req;
558 void *tmp;
559
560 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
561 iv_offset = size;
562 size += GCM_AES_IV_LEN;
563
564 size = ALIGN(size, __alignof__(struct scatterlist));
565 sg_offset = size;
566 size += sizeof(struct scatterlist) * num_frags;
567
568 tmp = kmalloc(size, GFP_ATOMIC);
569 if (!tmp)
570 return NULL;
571
572 *iv = (unsigned char *)(tmp + iv_offset);
573 *sg = (struct scatterlist *)(tmp + sg_offset);
574 req = tmp;
575
576 aead_request_set_tfm(req, tfm);
577
578 return req;
579}
580
581static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
582 struct net_device *dev)
583{
584 int ret;
585 struct scatterlist *sg;
586 struct sk_buff *trailer;
587 unsigned char *iv;
588 struct ethhdr *eth;
589 struct macsec_eth_header *hh;
590 size_t unprotected_len;
591 struct aead_request *req;
592 struct macsec_secy *secy;
593 struct macsec_tx_sc *tx_sc;
594 struct macsec_tx_sa *tx_sa;
595 struct macsec_dev *macsec = macsec_priv(dev);
596 bool sci_present;
597 pn_t pn;
598
599 secy = &macsec->secy;
600 tx_sc = &secy->tx_sc;
601
602 /* 10.5.1 TX SA assignment */
603 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
604 if (!tx_sa) {
605 secy->operational = false;
606 kfree_skb(skb);
607 return ERR_PTR(-EINVAL);
608 }
609
610 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
611 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
612 struct sk_buff *nskb = skb_copy_expand(skb,
613 MACSEC_NEEDED_HEADROOM,
614 MACSEC_NEEDED_TAILROOM,
615 GFP_ATOMIC);
616 if (likely(nskb)) {
617 consume_skb(skb);
618 skb = nskb;
619 } else {
620 macsec_txsa_put(tx_sa);
621 kfree_skb(skb);
622 return ERR_PTR(-ENOMEM);
623 }
624 } else {
625 skb = skb_unshare(skb, GFP_ATOMIC);
626 if (!skb) {
627 macsec_txsa_put(tx_sa);
628 return ERR_PTR(-ENOMEM);
629 }
630 }
631
632 unprotected_len = skb->len;
633 eth = eth_hdr(skb);
634 sci_present = send_sci(secy);
635 hh = skb_push(skb, macsec_extra_len(sci_present));
636 memmove(hh, eth, 2 * ETH_ALEN);
637
638 pn = tx_sa_update_pn(tx_sa, secy);
639 if (pn.full64 == 0) {
640 macsec_txsa_put(tx_sa);
641 kfree_skb(skb);
642 return ERR_PTR(-ENOLINK);
643 }
644 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
645 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
646
647 skb_put(skb, secy->icv_len);
648
649 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
650 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
651
652 u64_stats_update_begin(&secy_stats->syncp);
653 secy_stats->stats.OutPktsTooLong++;
654 u64_stats_update_end(&secy_stats->syncp);
655
656 macsec_txsa_put(tx_sa);
657 kfree_skb(skb);
658 return ERR_PTR(-EINVAL);
659 }
660
661 ret = skb_cow_data(skb, 0, &trailer);
662 if (unlikely(ret < 0)) {
663 macsec_txsa_put(tx_sa);
664 kfree_skb(skb);
665 return ERR_PTR(ret);
666 }
667
668 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
669 if (!req) {
670 macsec_txsa_put(tx_sa);
671 kfree_skb(skb);
672 return ERR_PTR(-ENOMEM);
673 }
674
675 if (secy->xpn)
676 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
677 else
678 macsec_fill_iv(iv, secy->sci, pn.lower);
679
680 sg_init_table(sg, ret);
681 ret = skb_to_sgvec(skb, sg, 0, skb->len);
682 if (unlikely(ret < 0)) {
683 aead_request_free(req);
684 macsec_txsa_put(tx_sa);
685 kfree_skb(skb);
686 return ERR_PTR(ret);
687 }
688
689 if (tx_sc->encrypt) {
690 int len = skb->len - macsec_hdr_len(sci_present) -
691 secy->icv_len;
692 aead_request_set_crypt(req, sg, sg, len, iv);
693 aead_request_set_ad(req, macsec_hdr_len(sci_present));
694 } else {
695 aead_request_set_crypt(req, sg, sg, 0, iv);
696 aead_request_set_ad(req, skb->len - secy->icv_len);
697 }
698
699 macsec_skb_cb(skb)->req = req;
700 macsec_skb_cb(skb)->tx_sa = tx_sa;
701 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
702
703 dev_hold(skb->dev);
704 ret = crypto_aead_encrypt(req);
705 if (ret == -EINPROGRESS) {
706 return ERR_PTR(ret);
707 } else if (ret != 0) {
708 dev_put(skb->dev);
709 kfree_skb(skb);
710 aead_request_free(req);
711 macsec_txsa_put(tx_sa);
712 return ERR_PTR(-EINVAL);
713 }
714
715 dev_put(skb->dev);
716 aead_request_free(req);
717 macsec_txsa_put(tx_sa);
718
719 return skb;
720}
721
722static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
723{
724 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
725 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
726 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
727 u32 lowest_pn = 0;
728
729 spin_lock(&rx_sa->lock);
730 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
731 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
732
733 /* Now perform replay protection check again
734 * (see IEEE 802.1AE-2006 figure 10-5)
735 */
736 if (secy->replay_protect && pn < lowest_pn &&
737 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
738 spin_unlock(&rx_sa->lock);
739 u64_stats_update_begin(&rxsc_stats->syncp);
740 rxsc_stats->stats.InPktsLate++;
741 u64_stats_update_end(&rxsc_stats->syncp);
742 return false;
743 }
744
745 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
746 u64_stats_update_begin(&rxsc_stats->syncp);
747 if (hdr->tci_an & MACSEC_TCI_E)
748 rxsc_stats->stats.InOctetsDecrypted += skb->len;
749 else
750 rxsc_stats->stats.InOctetsValidated += skb->len;
751 u64_stats_update_end(&rxsc_stats->syncp);
752 }
753
754 if (!macsec_skb_cb(skb)->valid) {
755 spin_unlock(&rx_sa->lock);
756
757 /* 10.6.5 */
758 if (hdr->tci_an & MACSEC_TCI_C ||
759 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
760 u64_stats_update_begin(&rxsc_stats->syncp);
761 rxsc_stats->stats.InPktsNotValid++;
762 u64_stats_update_end(&rxsc_stats->syncp);
763 return false;
764 }
765
766 u64_stats_update_begin(&rxsc_stats->syncp);
767 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
768 rxsc_stats->stats.InPktsInvalid++;
769 this_cpu_inc(rx_sa->stats->InPktsInvalid);
770 } else if (pn < lowest_pn) {
771 rxsc_stats->stats.InPktsDelayed++;
772 } else {
773 rxsc_stats->stats.InPktsUnchecked++;
774 }
775 u64_stats_update_end(&rxsc_stats->syncp);
776 } else {
777 u64_stats_update_begin(&rxsc_stats->syncp);
778 if (pn < lowest_pn) {
779 rxsc_stats->stats.InPktsDelayed++;
780 } else {
781 rxsc_stats->stats.InPktsOK++;
782 this_cpu_inc(rx_sa->stats->InPktsOK);
783 }
784 u64_stats_update_end(&rxsc_stats->syncp);
785
786 // Instead of "pn >=" - to support pn overflow in xpn
787 if (pn + 1 > rx_sa->next_pn_halves.lower) {
788 rx_sa->next_pn_halves.lower = pn + 1;
789 } else if (secy->xpn &&
790 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
791 rx_sa->next_pn_halves.upper++;
792 rx_sa->next_pn_halves.lower = pn + 1;
793 }
794
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 skb->ip_summed = CHECKSUM_NONE;
815 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
816 skb_pull(skb, hdr_len);
817 pskb_trim_unique(skb, skb->len - icv_len);
818}
819
820static void count_rx(struct net_device *dev, int len)
821{
822 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
823
824 u64_stats_update_begin(&stats->syncp);
825 stats->rx_packets++;
826 stats->rx_bytes += len;
827 u64_stats_update_end(&stats->syncp);
828}
829
830static void macsec_decrypt_done(struct crypto_async_request *base, int err)
831{
832 struct sk_buff *skb = base->data;
833 struct net_device *dev = skb->dev;
834 struct macsec_dev *macsec = macsec_priv(dev);
835 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
836 struct macsec_rx_sc *rx_sc = rx_sa->sc;
837 int len;
838 u32 pn;
839
840 aead_request_free(macsec_skb_cb(skb)->req);
841
842 if (!err)
843 macsec_skb_cb(skb)->valid = true;
844
845 rcu_read_lock_bh();
846 pn = ntohl(macsec_ethhdr(skb)->packet_number);
847 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
848 rcu_read_unlock_bh();
849 kfree_skb(skb);
850 goto out;
851 }
852
853 macsec_finalize_skb(skb, macsec->secy.icv_len,
854 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
855 macsec_reset_skb(skb, macsec->secy.netdev);
856
857 len = skb->len;
858 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
859 count_rx(dev, len);
860
861 rcu_read_unlock_bh();
862
863out:
864 macsec_rxsa_put(rx_sa);
865 macsec_rxsc_put(rx_sc);
866 dev_put(dev);
867}
868
869static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
870 struct net_device *dev,
871 struct macsec_rx_sa *rx_sa,
872 sci_t sci,
873 struct macsec_secy *secy)
874{
875 int ret;
876 struct scatterlist *sg;
877 struct sk_buff *trailer;
878 unsigned char *iv;
879 struct aead_request *req;
880 struct macsec_eth_header *hdr;
881 u32 hdr_pn;
882 u16 icv_len = secy->icv_len;
883
884 macsec_skb_cb(skb)->valid = false;
885 skb = skb_share_check(skb, GFP_ATOMIC);
886 if (!skb)
887 return ERR_PTR(-ENOMEM);
888
889 ret = skb_cow_data(skb, 0, &trailer);
890 if (unlikely(ret < 0)) {
891 kfree_skb(skb);
892 return ERR_PTR(ret);
893 }
894 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
895 if (!req) {
896 kfree_skb(skb);
897 return ERR_PTR(-ENOMEM);
898 }
899
900 hdr = (struct macsec_eth_header *)skb->data;
901 hdr_pn = ntohl(hdr->packet_number);
902
903 if (secy->xpn) {
904 pn_t recovered_pn = rx_sa->next_pn_halves;
905
906 recovered_pn.lower = hdr_pn;
907 if (hdr_pn < rx_sa->next_pn_halves.lower &&
908 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
909 recovered_pn.upper++;
910
911 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
912 rx_sa->key.salt);
913 } else {
914 macsec_fill_iv(iv, sci, hdr_pn);
915 }
916
917 sg_init_table(sg, ret);
918 ret = skb_to_sgvec(skb, sg, 0, skb->len);
919 if (unlikely(ret < 0)) {
920 aead_request_free(req);
921 kfree_skb(skb);
922 return ERR_PTR(ret);
923 }
924
925 if (hdr->tci_an & MACSEC_TCI_E) {
926 /* confidentiality: ethernet + macsec header
927 * authenticated, encrypted payload
928 */
929 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
930
931 aead_request_set_crypt(req, sg, sg, len, iv);
932 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
933 skb = skb_unshare(skb, GFP_ATOMIC);
934 if (!skb) {
935 aead_request_free(req);
936 return ERR_PTR(-ENOMEM);
937 }
938 } else {
939 /* integrity only: all headers + data authenticated */
940 aead_request_set_crypt(req, sg, sg, icv_len, iv);
941 aead_request_set_ad(req, skb->len - icv_len);
942 }
943
944 macsec_skb_cb(skb)->req = req;
945 skb->dev = dev;
946 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
947
948 dev_hold(dev);
949 ret = crypto_aead_decrypt(req);
950 if (ret == -EINPROGRESS) {
951 return ERR_PTR(ret);
952 } else if (ret != 0) {
953 /* decryption/authentication failed
954 * 10.6 if validateFrames is disabled, deliver anyway
955 */
956 if (ret != -EBADMSG) {
957 kfree_skb(skb);
958 skb = ERR_PTR(ret);
959 }
960 } else {
961 macsec_skb_cb(skb)->valid = true;
962 }
963 dev_put(dev);
964
965 aead_request_free(req);
966
967 return skb;
968}
969
970static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
971{
972 struct macsec_rx_sc *rx_sc;
973
974 for_each_rxsc(secy, rx_sc) {
975 if (rx_sc->sci == sci)
976 return rx_sc;
977 }
978
979 return NULL;
980}
981
982static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
983{
984 struct macsec_rx_sc *rx_sc;
985
986 for_each_rxsc_rtnl(secy, rx_sc) {
987 if (rx_sc->sci == sci)
988 return rx_sc;
989 }
990
991 return NULL;
992}
993
994static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
995{
996 /* Deliver to the uncontrolled port by default */
997 enum rx_handler_result ret = RX_HANDLER_PASS;
998 struct ethhdr *hdr = eth_hdr(skb);
999 struct macsec_rxh_data *rxd;
1000 struct macsec_dev *macsec;
1001
1002 rcu_read_lock();
1003 rxd = macsec_data_rcu(skb->dev);
1004
1005 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1006 struct sk_buff *nskb;
1007 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1008 struct net_device *ndev = macsec->secy.netdev;
1009
1010 /* If h/w offloading is enabled, HW decodes frames and strips
1011 * the SecTAG, so we have to deduce which port to deliver to.
1012 */
1013 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1014 if (ether_addr_equal_64bits(hdr->h_dest,
1015 ndev->dev_addr)) {
1016 /* exact match, divert skb to this port */
1017 skb->dev = ndev;
1018 skb->pkt_type = PACKET_HOST;
1019 ret = RX_HANDLER_ANOTHER;
1020 goto out;
1021 } else if (is_multicast_ether_addr_64bits(
1022 hdr->h_dest)) {
1023 /* multicast frame, deliver on this port too */
1024 nskb = skb_clone(skb, GFP_ATOMIC);
1025 if (!nskb)
1026 break;
1027
1028 nskb->dev = ndev;
1029 if (ether_addr_equal_64bits(hdr->h_dest,
1030 ndev->broadcast))
1031 nskb->pkt_type = PACKET_BROADCAST;
1032 else
1033 nskb->pkt_type = PACKET_MULTICAST;
1034
1035 netif_rx(nskb);
1036 }
1037 continue;
1038 }
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 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1045 u64_stats_update_begin(&secy_stats->syncp);
1046 secy_stats->stats.InPktsNoTag++;
1047 u64_stats_update_end(&secy_stats->syncp);
1048 continue;
1049 }
1050
1051 /* deliver on this port */
1052 nskb = skb_clone(skb, GFP_ATOMIC);
1053 if (!nskb)
1054 break;
1055
1056 nskb->dev = ndev;
1057
1058 if (netif_rx(nskb) == NET_RX_SUCCESS) {
1059 u64_stats_update_begin(&secy_stats->syncp);
1060 secy_stats->stats.InPktsUntagged++;
1061 u64_stats_update_end(&secy_stats->syncp);
1062 }
1063 }
1064
1065out:
1066 rcu_read_unlock();
1067 return ret;
1068}
1069
1070static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1071{
1072 struct sk_buff *skb = *pskb;
1073 struct net_device *dev = skb->dev;
1074 struct macsec_eth_header *hdr;
1075 struct macsec_secy *secy = NULL;
1076 struct macsec_rx_sc *rx_sc;
1077 struct macsec_rx_sa *rx_sa;
1078 struct macsec_rxh_data *rxd;
1079 struct macsec_dev *macsec;
1080 unsigned int len;
1081 sci_t sci;
1082 u32 hdr_pn;
1083 bool cbit;
1084 struct pcpu_rx_sc_stats *rxsc_stats;
1085 struct pcpu_secy_stats *secy_stats;
1086 bool pulled_sci;
1087 int ret;
1088
1089 if (skb_headroom(skb) < ETH_HLEN)
1090 goto drop_direct;
1091
1092 hdr = macsec_ethhdr(skb);
1093 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1094 return handle_not_macsec(skb);
1095
1096 skb = skb_unshare(skb, GFP_ATOMIC);
1097 *pskb = skb;
1098 if (!skb)
1099 return RX_HANDLER_CONSUMED;
1100
1101 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1102 if (!pulled_sci) {
1103 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1104 goto drop_direct;
1105 }
1106
1107 hdr = macsec_ethhdr(skb);
1108
1109 /* Frames with a SecTAG that has the TCI E bit set but the C
1110 * bit clear are discarded, as this reserved encoding is used
1111 * to identify frames with a SecTAG that are not to be
1112 * delivered to the Controlled Port.
1113 */
1114 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1115 return RX_HANDLER_PASS;
1116
1117 /* now, pull the extra length */
1118 if (hdr->tci_an & MACSEC_TCI_SC) {
1119 if (!pulled_sci)
1120 goto drop_direct;
1121 }
1122
1123 /* ethernet header is part of crypto processing */
1124 skb_push(skb, ETH_HLEN);
1125
1126 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1127 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1128 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1129
1130 rcu_read_lock();
1131 rxd = macsec_data_rcu(skb->dev);
1132
1133 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1134 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1135
1136 sc = sc ? macsec_rxsc_get(sc) : NULL;
1137
1138 if (sc) {
1139 secy = &macsec->secy;
1140 rx_sc = sc;
1141 break;
1142 }
1143 }
1144
1145 if (!secy)
1146 goto nosci;
1147
1148 dev = secy->netdev;
1149 macsec = macsec_priv(dev);
1150 secy_stats = this_cpu_ptr(macsec->stats);
1151 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1152
1153 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1154 u64_stats_update_begin(&secy_stats->syncp);
1155 secy_stats->stats.InPktsBadTag++;
1156 u64_stats_update_end(&secy_stats->syncp);
1157 goto drop_nosa;
1158 }
1159
1160 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1161 if (!rx_sa) {
1162 /* 10.6.1 if the SA is not in use */
1163
1164 /* If validateFrames is Strict or the C bit in the
1165 * SecTAG is set, discard
1166 */
1167 if (hdr->tci_an & MACSEC_TCI_C ||
1168 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1169 u64_stats_update_begin(&rxsc_stats->syncp);
1170 rxsc_stats->stats.InPktsNotUsingSA++;
1171 u64_stats_update_end(&rxsc_stats->syncp);
1172 goto drop_nosa;
1173 }
1174
1175 /* not Strict, the frame (with the SecTAG and ICV
1176 * removed) is delivered to the Controlled Port.
1177 */
1178 u64_stats_update_begin(&rxsc_stats->syncp);
1179 rxsc_stats->stats.InPktsUnusedSA++;
1180 u64_stats_update_end(&rxsc_stats->syncp);
1181 goto deliver;
1182 }
1183
1184 /* First, PN check to avoid decrypting obviously wrong packets */
1185 hdr_pn = ntohl(hdr->packet_number);
1186 if (secy->replay_protect) {
1187 bool late;
1188
1189 spin_lock(&rx_sa->lock);
1190 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1191 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1192
1193 if (secy->xpn)
1194 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1195 spin_unlock(&rx_sa->lock);
1196
1197 if (late) {
1198 u64_stats_update_begin(&rxsc_stats->syncp);
1199 rxsc_stats->stats.InPktsLate++;
1200 u64_stats_update_end(&rxsc_stats->syncp);
1201 goto drop;
1202 }
1203 }
1204
1205 macsec_skb_cb(skb)->rx_sa = rx_sa;
1206
1207 /* Disabled && !changed text => skip validation */
1208 if (hdr->tci_an & MACSEC_TCI_C ||
1209 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1210 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1211
1212 if (IS_ERR(skb)) {
1213 /* the decrypt callback needs the reference */
1214 if (PTR_ERR(skb) != -EINPROGRESS) {
1215 macsec_rxsa_put(rx_sa);
1216 macsec_rxsc_put(rx_sc);
1217 }
1218 rcu_read_unlock();
1219 *pskb = NULL;
1220 return RX_HANDLER_CONSUMED;
1221 }
1222
1223 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1224 goto drop;
1225
1226deliver:
1227 macsec_finalize_skb(skb, secy->icv_len,
1228 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1229 macsec_reset_skb(skb, secy->netdev);
1230
1231 if (rx_sa)
1232 macsec_rxsa_put(rx_sa);
1233 macsec_rxsc_put(rx_sc);
1234
1235 skb_orphan(skb);
1236 len = skb->len;
1237 ret = gro_cells_receive(&macsec->gro_cells, skb);
1238 if (ret == NET_RX_SUCCESS)
1239 count_rx(dev, len);
1240 else
1241 macsec->secy.netdev->stats.rx_dropped++;
1242
1243 rcu_read_unlock();
1244
1245 *pskb = NULL;
1246 return RX_HANDLER_CONSUMED;
1247
1248drop:
1249 macsec_rxsa_put(rx_sa);
1250drop_nosa:
1251 macsec_rxsc_put(rx_sc);
1252 rcu_read_unlock();
1253drop_direct:
1254 kfree_skb(skb);
1255 *pskb = NULL;
1256 return RX_HANDLER_CONSUMED;
1257
1258nosci:
1259 /* 10.6.1 if the SC is not found */
1260 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1261 if (!cbit)
1262 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1263 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1264
1265 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1266 struct sk_buff *nskb;
1267
1268 secy_stats = this_cpu_ptr(macsec->stats);
1269
1270 /* If validateFrames is Strict or the C bit in the
1271 * SecTAG is set, discard
1272 */
1273 if (cbit ||
1274 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1275 u64_stats_update_begin(&secy_stats->syncp);
1276 secy_stats->stats.InPktsNoSCI++;
1277 u64_stats_update_end(&secy_stats->syncp);
1278 continue;
1279 }
1280
1281 /* not strict, the frame (with the SecTAG and ICV
1282 * removed) is delivered to the Controlled Port.
1283 */
1284 nskb = skb_clone(skb, GFP_ATOMIC);
1285 if (!nskb)
1286 break;
1287
1288 macsec_reset_skb(nskb, macsec->secy.netdev);
1289
1290 ret = netif_rx(nskb);
1291 if (ret == NET_RX_SUCCESS) {
1292 u64_stats_update_begin(&secy_stats->syncp);
1293 secy_stats->stats.InPktsUnknownSCI++;
1294 u64_stats_update_end(&secy_stats->syncp);
1295 } else {
1296 macsec->secy.netdev->stats.rx_dropped++;
1297 }
1298 }
1299
1300 rcu_read_unlock();
1301 *pskb = skb;
1302 return RX_HANDLER_PASS;
1303}
1304
1305static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1306{
1307 struct crypto_aead *tfm;
1308 int ret;
1309
1310 /* Pick a sync gcm(aes) cipher to ensure order is preserved. */
1311 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
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->ssci = MACSEC_UNDEF_SSCI;
1344 rx_sa->active = false;
1345 rx_sa->next_pn = 1;
1346 refcount_set(&rx_sa->refcnt, 1);
1347 spin_lock_init(&rx_sa->lock);
1348
1349 return 0;
1350}
1351
1352static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1353{
1354 rx_sa->active = false;
1355
1356 macsec_rxsa_put(rx_sa);
1357}
1358
1359static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1360{
1361 int i;
1362
1363 for (i = 0; i < MACSEC_NUM_AN; i++) {
1364 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1365
1366 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1367 if (sa)
1368 clear_rx_sa(sa);
1369 }
1370
1371 macsec_rxsc_put(rx_sc);
1372}
1373
1374static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1375{
1376 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1377
1378 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1379 rx_sc;
1380 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1381 if (rx_sc->sci == sci) {
1382 if (rx_sc->active)
1383 secy->n_rx_sc--;
1384 rcu_assign_pointer(*rx_scp, rx_sc->next);
1385 return rx_sc;
1386 }
1387 }
1388
1389 return NULL;
1390}
1391
1392static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1393{
1394 struct macsec_rx_sc *rx_sc;
1395 struct macsec_dev *macsec;
1396 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1397 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1398 struct macsec_secy *secy;
1399
1400 list_for_each_entry(macsec, &rxd->secys, secys) {
1401 if (find_rx_sc_rtnl(&macsec->secy, sci))
1402 return ERR_PTR(-EEXIST);
1403 }
1404
1405 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1406 if (!rx_sc)
1407 return ERR_PTR(-ENOMEM);
1408
1409 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1410 if (!rx_sc->stats) {
1411 kfree(rx_sc);
1412 return ERR_PTR(-ENOMEM);
1413 }
1414
1415 rx_sc->sci = sci;
1416 rx_sc->active = true;
1417 refcount_set(&rx_sc->refcnt, 1);
1418
1419 secy = &macsec_priv(dev)->secy;
1420 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1421 rcu_assign_pointer(secy->rx_sc, rx_sc);
1422
1423 if (rx_sc->active)
1424 secy->n_rx_sc++;
1425
1426 return rx_sc;
1427}
1428
1429static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1430 int icv_len)
1431{
1432 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1433 if (!tx_sa->stats)
1434 return -ENOMEM;
1435
1436 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1437 if (IS_ERR(tx_sa->key.tfm)) {
1438 free_percpu(tx_sa->stats);
1439 return PTR_ERR(tx_sa->key.tfm);
1440 }
1441
1442 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1443 tx_sa->active = false;
1444 refcount_set(&tx_sa->refcnt, 1);
1445 spin_lock_init(&tx_sa->lock);
1446
1447 return 0;
1448}
1449
1450static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1451{
1452 tx_sa->active = false;
1453
1454 macsec_txsa_put(tx_sa);
1455}
1456
1457static struct genl_family macsec_fam;
1458
1459static struct net_device *get_dev_from_nl(struct net *net,
1460 struct nlattr **attrs)
1461{
1462 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1463 struct net_device *dev;
1464
1465 dev = __dev_get_by_index(net, ifindex);
1466 if (!dev)
1467 return ERR_PTR(-ENODEV);
1468
1469 if (!netif_is_macsec(dev))
1470 return ERR_PTR(-ENODEV);
1471
1472 return dev;
1473}
1474
1475static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1476{
1477 return (__force enum macsec_offload)nla_get_u8(nla);
1478}
1479
1480static sci_t nla_get_sci(const struct nlattr *nla)
1481{
1482 return (__force sci_t)nla_get_u64(nla);
1483}
1484
1485static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1486 int padattr)
1487{
1488 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1489}
1490
1491static ssci_t nla_get_ssci(const struct nlattr *nla)
1492{
1493 return (__force ssci_t)nla_get_u32(nla);
1494}
1495
1496static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1497{
1498 return nla_put_u32(skb, attrtype, (__force u64)value);
1499}
1500
1501static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1502 struct nlattr **attrs,
1503 struct nlattr **tb_sa,
1504 struct net_device **devp,
1505 struct macsec_secy **secyp,
1506 struct macsec_tx_sc **scp,
1507 u8 *assoc_num)
1508{
1509 struct net_device *dev;
1510 struct macsec_secy *secy;
1511 struct macsec_tx_sc *tx_sc;
1512 struct macsec_tx_sa *tx_sa;
1513
1514 if (!tb_sa[MACSEC_SA_ATTR_AN])
1515 return ERR_PTR(-EINVAL);
1516
1517 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1518
1519 dev = get_dev_from_nl(net, attrs);
1520 if (IS_ERR(dev))
1521 return ERR_CAST(dev);
1522
1523 if (*assoc_num >= MACSEC_NUM_AN)
1524 return ERR_PTR(-EINVAL);
1525
1526 secy = &macsec_priv(dev)->secy;
1527 tx_sc = &secy->tx_sc;
1528
1529 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1530 if (!tx_sa)
1531 return ERR_PTR(-ENODEV);
1532
1533 *devp = dev;
1534 *scp = tx_sc;
1535 *secyp = secy;
1536 return tx_sa;
1537}
1538
1539static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1540 struct nlattr **attrs,
1541 struct nlattr **tb_rxsc,
1542 struct net_device **devp,
1543 struct macsec_secy **secyp)
1544{
1545 struct net_device *dev;
1546 struct macsec_secy *secy;
1547 struct macsec_rx_sc *rx_sc;
1548 sci_t sci;
1549
1550 dev = get_dev_from_nl(net, attrs);
1551 if (IS_ERR(dev))
1552 return ERR_CAST(dev);
1553
1554 secy = &macsec_priv(dev)->secy;
1555
1556 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1557 return ERR_PTR(-EINVAL);
1558
1559 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1560 rx_sc = find_rx_sc_rtnl(secy, sci);
1561 if (!rx_sc)
1562 return ERR_PTR(-ENODEV);
1563
1564 *secyp = secy;
1565 *devp = dev;
1566
1567 return rx_sc;
1568}
1569
1570static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1571 struct nlattr **attrs,
1572 struct nlattr **tb_rxsc,
1573 struct nlattr **tb_sa,
1574 struct net_device **devp,
1575 struct macsec_secy **secyp,
1576 struct macsec_rx_sc **scp,
1577 u8 *assoc_num)
1578{
1579 struct macsec_rx_sc *rx_sc;
1580 struct macsec_rx_sa *rx_sa;
1581
1582 if (!tb_sa[MACSEC_SA_ATTR_AN])
1583 return ERR_PTR(-EINVAL);
1584
1585 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1586 if (*assoc_num >= MACSEC_NUM_AN)
1587 return ERR_PTR(-EINVAL);
1588
1589 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1590 if (IS_ERR(rx_sc))
1591 return ERR_CAST(rx_sc);
1592
1593 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1594 if (!rx_sa)
1595 return ERR_PTR(-ENODEV);
1596
1597 *scp = rx_sc;
1598 return rx_sa;
1599}
1600
1601static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1602 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1603 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1604 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1605 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1606};
1607
1608static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1609 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1610 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1611};
1612
1613static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1614 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1615 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1616 [MACSEC_SA_ATTR_PN] = { .type = NLA_MIN_LEN, .len = 4 },
1617 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1618 .len = MACSEC_KEYID_LEN, },
1619 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1620 .len = MACSEC_MAX_KEY_LEN, },
1621 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1622 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1623 .len = MACSEC_SALT_LEN, },
1624};
1625
1626static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1627 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1628};
1629
1630/* Offloads an operation to a device driver */
1631static int macsec_offload(int (* const func)(struct macsec_context *),
1632 struct macsec_context *ctx)
1633{
1634 int ret;
1635
1636 if (unlikely(!func))
1637 return 0;
1638
1639 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1640 mutex_lock(&ctx->phydev->lock);
1641
1642 /* Phase I: prepare. The drive should fail here if there are going to be
1643 * issues in the commit phase.
1644 */
1645 ctx->prepare = true;
1646 ret = (*func)(ctx);
1647 if (ret)
1648 goto phy_unlock;
1649
1650 /* Phase II: commit. This step cannot fail. */
1651 ctx->prepare = false;
1652 ret = (*func)(ctx);
1653 /* This should never happen: commit is not allowed to fail */
1654 if (unlikely(ret))
1655 WARN(1, "MACsec offloading commit failed (%d)\n", ret);
1656
1657phy_unlock:
1658 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1659 mutex_unlock(&ctx->phydev->lock);
1660
1661 return ret;
1662}
1663
1664static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1665{
1666 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1667 return -EINVAL;
1668
1669 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1670 return -EINVAL;
1671
1672 return 0;
1673}
1674
1675static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1676{
1677 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1678 return -EINVAL;
1679
1680 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1681 return -EINVAL;
1682
1683 return 0;
1684}
1685
1686static bool validate_add_rxsa(struct nlattr **attrs)
1687{
1688 if (!attrs[MACSEC_SA_ATTR_AN] ||
1689 !attrs[MACSEC_SA_ATTR_KEY] ||
1690 !attrs[MACSEC_SA_ATTR_KEYID])
1691 return false;
1692
1693 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1694 return false;
1695
1696 if (attrs[MACSEC_SA_ATTR_PN] &&
1697 *(u64 *)nla_data(attrs[MACSEC_SA_ATTR_PN]) == 0)
1698 return false;
1699
1700 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1701 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1702 return false;
1703 }
1704
1705 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1706 return false;
1707
1708 return true;
1709}
1710
1711static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1712{
1713 struct net_device *dev;
1714 struct nlattr **attrs = info->attrs;
1715 struct macsec_secy *secy;
1716 struct macsec_rx_sc *rx_sc;
1717 struct macsec_rx_sa *rx_sa;
1718 unsigned char assoc_num;
1719 int pn_len;
1720 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1721 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1722 int err;
1723
1724 if (!attrs[MACSEC_ATTR_IFINDEX])
1725 return -EINVAL;
1726
1727 if (parse_sa_config(attrs, tb_sa))
1728 return -EINVAL;
1729
1730 if (parse_rxsc_config(attrs, tb_rxsc))
1731 return -EINVAL;
1732
1733 if (!validate_add_rxsa(tb_sa))
1734 return -EINVAL;
1735
1736 rtnl_lock();
1737 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1738 if (IS_ERR(rx_sc)) {
1739 rtnl_unlock();
1740 return PTR_ERR(rx_sc);
1741 }
1742
1743 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1744
1745 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1746 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1747 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1748 rtnl_unlock();
1749 return -EINVAL;
1750 }
1751
1752 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1753 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1754 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1755 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1756 rtnl_unlock();
1757 return -EINVAL;
1758 }
1759
1760 if (secy->xpn) {
1761 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1762 rtnl_unlock();
1763 return -EINVAL;
1764 }
1765
1766 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1767 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1768 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1769 MACSEC_SA_ATTR_SALT);
1770 rtnl_unlock();
1771 return -EINVAL;
1772 }
1773 }
1774
1775 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1776 if (rx_sa) {
1777 rtnl_unlock();
1778 return -EBUSY;
1779 }
1780
1781 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1782 if (!rx_sa) {
1783 rtnl_unlock();
1784 return -ENOMEM;
1785 }
1786
1787 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1788 secy->key_len, secy->icv_len);
1789 if (err < 0) {
1790 kfree(rx_sa);
1791 rtnl_unlock();
1792 return err;
1793 }
1794
1795 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1796 spin_lock_bh(&rx_sa->lock);
1797 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1798 spin_unlock_bh(&rx_sa->lock);
1799 }
1800
1801 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1802 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1803
1804 rx_sa->sc = rx_sc;
1805
1806 /* If h/w offloading is available, propagate to the device */
1807 if (macsec_is_offloaded(netdev_priv(dev))) {
1808 const struct macsec_ops *ops;
1809 struct macsec_context ctx;
1810
1811 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1812 if (!ops) {
1813 err = -EOPNOTSUPP;
1814 goto cleanup;
1815 }
1816
1817 ctx.sa.assoc_num = assoc_num;
1818 ctx.sa.rx_sa = rx_sa;
1819 ctx.secy = secy;
1820 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1821 MACSEC_KEYID_LEN);
1822
1823 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1824 if (err)
1825 goto cleanup;
1826 }
1827
1828 if (secy->xpn) {
1829 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1830 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1831 MACSEC_SALT_LEN);
1832 }
1833
1834 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1835 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1836
1837 rtnl_unlock();
1838
1839 return 0;
1840
1841cleanup:
1842 kfree(rx_sa);
1843 rtnl_unlock();
1844 return err;
1845}
1846
1847static bool validate_add_rxsc(struct nlattr **attrs)
1848{
1849 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1850 return false;
1851
1852 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1853 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1854 return false;
1855 }
1856
1857 return true;
1858}
1859
1860static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1861{
1862 struct net_device *dev;
1863 sci_t sci = MACSEC_UNDEF_SCI;
1864 struct nlattr **attrs = info->attrs;
1865 struct macsec_rx_sc *rx_sc;
1866 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1867 struct macsec_secy *secy;
1868 bool was_active;
1869 int ret;
1870
1871 if (!attrs[MACSEC_ATTR_IFINDEX])
1872 return -EINVAL;
1873
1874 if (parse_rxsc_config(attrs, tb_rxsc))
1875 return -EINVAL;
1876
1877 if (!validate_add_rxsc(tb_rxsc))
1878 return -EINVAL;
1879
1880 rtnl_lock();
1881 dev = get_dev_from_nl(genl_info_net(info), attrs);
1882 if (IS_ERR(dev)) {
1883 rtnl_unlock();
1884 return PTR_ERR(dev);
1885 }
1886
1887 secy = &macsec_priv(dev)->secy;
1888 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1889
1890 rx_sc = create_rx_sc(dev, sci);
1891 if (IS_ERR(rx_sc)) {
1892 rtnl_unlock();
1893 return PTR_ERR(rx_sc);
1894 }
1895
1896 was_active = rx_sc->active;
1897 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1898 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1899
1900 if (macsec_is_offloaded(netdev_priv(dev))) {
1901 const struct macsec_ops *ops;
1902 struct macsec_context ctx;
1903
1904 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1905 if (!ops) {
1906 ret = -EOPNOTSUPP;
1907 goto cleanup;
1908 }
1909
1910 ctx.rx_sc = rx_sc;
1911 ctx.secy = secy;
1912
1913 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1914 if (ret)
1915 goto cleanup;
1916 }
1917
1918 rtnl_unlock();
1919
1920 return 0;
1921
1922cleanup:
1923 rx_sc->active = was_active;
1924 rtnl_unlock();
1925 return ret;
1926}
1927
1928static bool validate_add_txsa(struct nlattr **attrs)
1929{
1930 if (!attrs[MACSEC_SA_ATTR_AN] ||
1931 !attrs[MACSEC_SA_ATTR_PN] ||
1932 !attrs[MACSEC_SA_ATTR_KEY] ||
1933 !attrs[MACSEC_SA_ATTR_KEYID])
1934 return false;
1935
1936 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1937 return false;
1938
1939 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1940 return false;
1941
1942 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1943 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1944 return false;
1945 }
1946
1947 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1948 return false;
1949
1950 return true;
1951}
1952
1953static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1954{
1955 struct net_device *dev;
1956 struct nlattr **attrs = info->attrs;
1957 struct macsec_secy *secy;
1958 struct macsec_tx_sc *tx_sc;
1959 struct macsec_tx_sa *tx_sa;
1960 unsigned char assoc_num;
1961 int pn_len;
1962 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1963 bool was_operational;
1964 int err;
1965
1966 if (!attrs[MACSEC_ATTR_IFINDEX])
1967 return -EINVAL;
1968
1969 if (parse_sa_config(attrs, tb_sa))
1970 return -EINVAL;
1971
1972 if (!validate_add_txsa(tb_sa))
1973 return -EINVAL;
1974
1975 rtnl_lock();
1976 dev = get_dev_from_nl(genl_info_net(info), attrs);
1977 if (IS_ERR(dev)) {
1978 rtnl_unlock();
1979 return PTR_ERR(dev);
1980 }
1981
1982 secy = &macsec_priv(dev)->secy;
1983 tx_sc = &secy->tx_sc;
1984
1985 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1986
1987 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1988 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1989 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1990 rtnl_unlock();
1991 return -EINVAL;
1992 }
1993
1994 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1995 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1996 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
1997 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1998 rtnl_unlock();
1999 return -EINVAL;
2000 }
2001
2002 if (secy->xpn) {
2003 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2004 rtnl_unlock();
2005 return -EINVAL;
2006 }
2007
2008 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2009 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2010 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2011 MACSEC_SA_ATTR_SALT);
2012 rtnl_unlock();
2013 return -EINVAL;
2014 }
2015 }
2016
2017 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2018 if (tx_sa) {
2019 rtnl_unlock();
2020 return -EBUSY;
2021 }
2022
2023 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2024 if (!tx_sa) {
2025 rtnl_unlock();
2026 return -ENOMEM;
2027 }
2028
2029 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2030 secy->key_len, secy->icv_len);
2031 if (err < 0) {
2032 kfree(tx_sa);
2033 rtnl_unlock();
2034 return err;
2035 }
2036
2037 spin_lock_bh(&tx_sa->lock);
2038 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2039 spin_unlock_bh(&tx_sa->lock);
2040
2041 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2042 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2043
2044 was_operational = secy->operational;
2045 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2046 secy->operational = true;
2047
2048 /* If h/w offloading is available, propagate to the device */
2049 if (macsec_is_offloaded(netdev_priv(dev))) {
2050 const struct macsec_ops *ops;
2051 struct macsec_context ctx;
2052
2053 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2054 if (!ops) {
2055 err = -EOPNOTSUPP;
2056 goto cleanup;
2057 }
2058
2059 ctx.sa.assoc_num = assoc_num;
2060 ctx.sa.tx_sa = tx_sa;
2061 ctx.secy = secy;
2062 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2063 MACSEC_KEYID_LEN);
2064
2065 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2066 if (err)
2067 goto cleanup;
2068 }
2069
2070 if (secy->xpn) {
2071 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2072 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2073 MACSEC_SALT_LEN);
2074 }
2075
2076 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2077 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2078
2079 rtnl_unlock();
2080
2081 return 0;
2082
2083cleanup:
2084 secy->operational = was_operational;
2085 kfree(tx_sa);
2086 rtnl_unlock();
2087 return err;
2088}
2089
2090static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2091{
2092 struct nlattr **attrs = info->attrs;
2093 struct net_device *dev;
2094 struct macsec_secy *secy;
2095 struct macsec_rx_sc *rx_sc;
2096 struct macsec_rx_sa *rx_sa;
2097 u8 assoc_num;
2098 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2099 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2100 int ret;
2101
2102 if (!attrs[MACSEC_ATTR_IFINDEX])
2103 return -EINVAL;
2104
2105 if (parse_sa_config(attrs, tb_sa))
2106 return -EINVAL;
2107
2108 if (parse_rxsc_config(attrs, tb_rxsc))
2109 return -EINVAL;
2110
2111 rtnl_lock();
2112 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2113 &dev, &secy, &rx_sc, &assoc_num);
2114 if (IS_ERR(rx_sa)) {
2115 rtnl_unlock();
2116 return PTR_ERR(rx_sa);
2117 }
2118
2119 if (rx_sa->active) {
2120 rtnl_unlock();
2121 return -EBUSY;
2122 }
2123
2124 /* If h/w offloading is available, propagate to the device */
2125 if (macsec_is_offloaded(netdev_priv(dev))) {
2126 const struct macsec_ops *ops;
2127 struct macsec_context ctx;
2128
2129 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2130 if (!ops) {
2131 ret = -EOPNOTSUPP;
2132 goto cleanup;
2133 }
2134
2135 ctx.sa.assoc_num = assoc_num;
2136 ctx.sa.rx_sa = rx_sa;
2137 ctx.secy = secy;
2138
2139 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2140 if (ret)
2141 goto cleanup;
2142 }
2143
2144 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2145 clear_rx_sa(rx_sa);
2146
2147 rtnl_unlock();
2148
2149 return 0;
2150
2151cleanup:
2152 rtnl_unlock();
2153 return ret;
2154}
2155
2156static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2157{
2158 struct nlattr **attrs = info->attrs;
2159 struct net_device *dev;
2160 struct macsec_secy *secy;
2161 struct macsec_rx_sc *rx_sc;
2162 sci_t sci;
2163 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2164 int ret;
2165
2166 if (!attrs[MACSEC_ATTR_IFINDEX])
2167 return -EINVAL;
2168
2169 if (parse_rxsc_config(attrs, tb_rxsc))
2170 return -EINVAL;
2171
2172 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2173 return -EINVAL;
2174
2175 rtnl_lock();
2176 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2177 if (IS_ERR(dev)) {
2178 rtnl_unlock();
2179 return PTR_ERR(dev);
2180 }
2181
2182 secy = &macsec_priv(dev)->secy;
2183 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2184
2185 rx_sc = del_rx_sc(secy, sci);
2186 if (!rx_sc) {
2187 rtnl_unlock();
2188 return -ENODEV;
2189 }
2190
2191 /* If h/w offloading is available, propagate to the device */
2192 if (macsec_is_offloaded(netdev_priv(dev))) {
2193 const struct macsec_ops *ops;
2194 struct macsec_context ctx;
2195
2196 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2197 if (!ops) {
2198 ret = -EOPNOTSUPP;
2199 goto cleanup;
2200 }
2201
2202 ctx.rx_sc = rx_sc;
2203 ctx.secy = secy;
2204 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2205 if (ret)
2206 goto cleanup;
2207 }
2208
2209 free_rx_sc(rx_sc);
2210 rtnl_unlock();
2211
2212 return 0;
2213
2214cleanup:
2215 rtnl_unlock();
2216 return ret;
2217}
2218
2219static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2220{
2221 struct nlattr **attrs = info->attrs;
2222 struct net_device *dev;
2223 struct macsec_secy *secy;
2224 struct macsec_tx_sc *tx_sc;
2225 struct macsec_tx_sa *tx_sa;
2226 u8 assoc_num;
2227 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2228 int ret;
2229
2230 if (!attrs[MACSEC_ATTR_IFINDEX])
2231 return -EINVAL;
2232
2233 if (parse_sa_config(attrs, tb_sa))
2234 return -EINVAL;
2235
2236 rtnl_lock();
2237 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2238 &dev, &secy, &tx_sc, &assoc_num);
2239 if (IS_ERR(tx_sa)) {
2240 rtnl_unlock();
2241 return PTR_ERR(tx_sa);
2242 }
2243
2244 if (tx_sa->active) {
2245 rtnl_unlock();
2246 return -EBUSY;
2247 }
2248
2249 /* If h/w offloading is available, propagate to the device */
2250 if (macsec_is_offloaded(netdev_priv(dev))) {
2251 const struct macsec_ops *ops;
2252 struct macsec_context ctx;
2253
2254 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2255 if (!ops) {
2256 ret = -EOPNOTSUPP;
2257 goto cleanup;
2258 }
2259
2260 ctx.sa.assoc_num = assoc_num;
2261 ctx.sa.tx_sa = tx_sa;
2262 ctx.secy = secy;
2263
2264 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2265 if (ret)
2266 goto cleanup;
2267 }
2268
2269 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2270 clear_tx_sa(tx_sa);
2271
2272 rtnl_unlock();
2273
2274 return 0;
2275
2276cleanup:
2277 rtnl_unlock();
2278 return ret;
2279}
2280
2281static bool validate_upd_sa(struct nlattr **attrs)
2282{
2283 if (!attrs[MACSEC_SA_ATTR_AN] ||
2284 attrs[MACSEC_SA_ATTR_KEY] ||
2285 attrs[MACSEC_SA_ATTR_KEYID] ||
2286 attrs[MACSEC_SA_ATTR_SSCI] ||
2287 attrs[MACSEC_SA_ATTR_SALT])
2288 return false;
2289
2290 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2291 return false;
2292
2293 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
2294 return false;
2295
2296 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2297 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2298 return false;
2299 }
2300
2301 return true;
2302}
2303
2304static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2305{
2306 struct nlattr **attrs = info->attrs;
2307 struct net_device *dev;
2308 struct macsec_secy *secy;
2309 struct macsec_tx_sc *tx_sc;
2310 struct macsec_tx_sa *tx_sa;
2311 u8 assoc_num;
2312 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2313 bool was_operational, was_active;
2314 pn_t prev_pn;
2315 int ret = 0;
2316
2317 prev_pn.full64 = 0;
2318
2319 if (!attrs[MACSEC_ATTR_IFINDEX])
2320 return -EINVAL;
2321
2322 if (parse_sa_config(attrs, tb_sa))
2323 return -EINVAL;
2324
2325 if (!validate_upd_sa(tb_sa))
2326 return -EINVAL;
2327
2328 rtnl_lock();
2329 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2330 &dev, &secy, &tx_sc, &assoc_num);
2331 if (IS_ERR(tx_sa)) {
2332 rtnl_unlock();
2333 return PTR_ERR(tx_sa);
2334 }
2335
2336 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2337 int pn_len;
2338
2339 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2340 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2341 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2342 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2343 rtnl_unlock();
2344 return -EINVAL;
2345 }
2346
2347 spin_lock_bh(&tx_sa->lock);
2348 prev_pn = tx_sa->next_pn_halves;
2349 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2350 spin_unlock_bh(&tx_sa->lock);
2351 }
2352
2353 was_active = tx_sa->active;
2354 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2355 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2356
2357 was_operational = secy->operational;
2358 if (assoc_num == tx_sc->encoding_sa)
2359 secy->operational = tx_sa->active;
2360
2361 /* If h/w offloading is available, propagate to the device */
2362 if (macsec_is_offloaded(netdev_priv(dev))) {
2363 const struct macsec_ops *ops;
2364 struct macsec_context ctx;
2365
2366 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2367 if (!ops) {
2368 ret = -EOPNOTSUPP;
2369 goto cleanup;
2370 }
2371
2372 ctx.sa.assoc_num = assoc_num;
2373 ctx.sa.tx_sa = tx_sa;
2374 ctx.secy = secy;
2375
2376 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2377 if (ret)
2378 goto cleanup;
2379 }
2380
2381 rtnl_unlock();
2382
2383 return 0;
2384
2385cleanup:
2386 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2387 spin_lock_bh(&tx_sa->lock);
2388 tx_sa->next_pn_halves = prev_pn;
2389 spin_unlock_bh(&tx_sa->lock);
2390 }
2391 tx_sa->active = was_active;
2392 secy->operational = was_operational;
2393 rtnl_unlock();
2394 return ret;
2395}
2396
2397static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2398{
2399 struct nlattr **attrs = info->attrs;
2400 struct net_device *dev;
2401 struct macsec_secy *secy;
2402 struct macsec_rx_sc *rx_sc;
2403 struct macsec_rx_sa *rx_sa;
2404 u8 assoc_num;
2405 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2406 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2407 bool was_active;
2408 pn_t prev_pn;
2409 int ret = 0;
2410
2411 prev_pn.full64 = 0;
2412
2413 if (!attrs[MACSEC_ATTR_IFINDEX])
2414 return -EINVAL;
2415
2416 if (parse_rxsc_config(attrs, tb_rxsc))
2417 return -EINVAL;
2418
2419 if (parse_sa_config(attrs, tb_sa))
2420 return -EINVAL;
2421
2422 if (!validate_upd_sa(tb_sa))
2423 return -EINVAL;
2424
2425 rtnl_lock();
2426 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2427 &dev, &secy, &rx_sc, &assoc_num);
2428 if (IS_ERR(rx_sa)) {
2429 rtnl_unlock();
2430 return PTR_ERR(rx_sa);
2431 }
2432
2433 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2434 int pn_len;
2435
2436 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2437 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2438 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2439 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2440 rtnl_unlock();
2441 return -EINVAL;
2442 }
2443
2444 spin_lock_bh(&rx_sa->lock);
2445 prev_pn = rx_sa->next_pn_halves;
2446 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2447 spin_unlock_bh(&rx_sa->lock);
2448 }
2449
2450 was_active = rx_sa->active;
2451 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2452 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2453
2454 /* If h/w offloading is available, propagate to the device */
2455 if (macsec_is_offloaded(netdev_priv(dev))) {
2456 const struct macsec_ops *ops;
2457 struct macsec_context ctx;
2458
2459 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2460 if (!ops) {
2461 ret = -EOPNOTSUPP;
2462 goto cleanup;
2463 }
2464
2465 ctx.sa.assoc_num = assoc_num;
2466 ctx.sa.rx_sa = rx_sa;
2467 ctx.secy = secy;
2468
2469 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2470 if (ret)
2471 goto cleanup;
2472 }
2473
2474 rtnl_unlock();
2475 return 0;
2476
2477cleanup:
2478 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2479 spin_lock_bh(&rx_sa->lock);
2480 rx_sa->next_pn_halves = prev_pn;
2481 spin_unlock_bh(&rx_sa->lock);
2482 }
2483 rx_sa->active = was_active;
2484 rtnl_unlock();
2485 return ret;
2486}
2487
2488static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2489{
2490 struct nlattr **attrs = info->attrs;
2491 struct net_device *dev;
2492 struct macsec_secy *secy;
2493 struct macsec_rx_sc *rx_sc;
2494 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2495 unsigned int prev_n_rx_sc;
2496 bool was_active;
2497 int ret;
2498
2499 if (!attrs[MACSEC_ATTR_IFINDEX])
2500 return -EINVAL;
2501
2502 if (parse_rxsc_config(attrs, tb_rxsc))
2503 return -EINVAL;
2504
2505 if (!validate_add_rxsc(tb_rxsc))
2506 return -EINVAL;
2507
2508 rtnl_lock();
2509 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2510 if (IS_ERR(rx_sc)) {
2511 rtnl_unlock();
2512 return PTR_ERR(rx_sc);
2513 }
2514
2515 was_active = rx_sc->active;
2516 prev_n_rx_sc = secy->n_rx_sc;
2517 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2518 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2519
2520 if (rx_sc->active != new)
2521 secy->n_rx_sc += new ? 1 : -1;
2522
2523 rx_sc->active = new;
2524 }
2525
2526 /* If h/w offloading is available, propagate to the device */
2527 if (macsec_is_offloaded(netdev_priv(dev))) {
2528 const struct macsec_ops *ops;
2529 struct macsec_context ctx;
2530
2531 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2532 if (!ops) {
2533 ret = -EOPNOTSUPP;
2534 goto cleanup;
2535 }
2536
2537 ctx.rx_sc = rx_sc;
2538 ctx.secy = secy;
2539
2540 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2541 if (ret)
2542 goto cleanup;
2543 }
2544
2545 rtnl_unlock();
2546
2547 return 0;
2548
2549cleanup:
2550 secy->n_rx_sc = prev_n_rx_sc;
2551 rx_sc->active = was_active;
2552 rtnl_unlock();
2553 return ret;
2554}
2555
2556static bool macsec_is_configured(struct macsec_dev *macsec)
2557{
2558 struct macsec_secy *secy = &macsec->secy;
2559 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2560 int i;
2561
2562 if (secy->n_rx_sc > 0)
2563 return true;
2564
2565 for (i = 0; i < MACSEC_NUM_AN; i++)
2566 if (tx_sc->sa[i])
2567 return true;
2568
2569 return false;
2570}
2571
2572static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2573{
2574 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2575 enum macsec_offload offload, prev_offload;
2576 int (*func)(struct macsec_context *ctx);
2577 struct nlattr **attrs = info->attrs;
2578 struct net_device *dev;
2579 const struct macsec_ops *ops;
2580 struct macsec_context ctx;
2581 struct macsec_dev *macsec;
2582 int ret;
2583
2584 if (!attrs[MACSEC_ATTR_IFINDEX])
2585 return -EINVAL;
2586
2587 if (!attrs[MACSEC_ATTR_OFFLOAD])
2588 return -EINVAL;
2589
2590 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2591 attrs[MACSEC_ATTR_OFFLOAD],
2592 macsec_genl_offload_policy, NULL))
2593 return -EINVAL;
2594
2595 dev = get_dev_from_nl(genl_info_net(info), attrs);
2596 if (IS_ERR(dev))
2597 return PTR_ERR(dev);
2598 macsec = macsec_priv(dev);
2599
2600 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE])
2601 return -EINVAL;
2602
2603 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2604 if (macsec->offload == offload)
2605 return 0;
2606
2607 /* Check if the offloading mode is supported by the underlying layers */
2608 if (offload != MACSEC_OFFLOAD_OFF &&
2609 !macsec_check_offload(offload, macsec))
2610 return -EOPNOTSUPP;
2611
2612 /* Check if the net device is busy. */
2613 if (netif_running(dev))
2614 return -EBUSY;
2615
2616 rtnl_lock();
2617
2618 prev_offload = macsec->offload;
2619 macsec->offload = offload;
2620
2621 /* Check if the device already has rules configured: we do not support
2622 * rules migration.
2623 */
2624 if (macsec_is_configured(macsec)) {
2625 ret = -EBUSY;
2626 goto rollback;
2627 }
2628
2629 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2630 macsec, &ctx);
2631 if (!ops) {
2632 ret = -EOPNOTSUPP;
2633 goto rollback;
2634 }
2635
2636 if (prev_offload == MACSEC_OFFLOAD_OFF)
2637 func = ops->mdo_add_secy;
2638 else
2639 func = ops->mdo_del_secy;
2640
2641 ctx.secy = &macsec->secy;
2642 ret = macsec_offload(func, &ctx);
2643 if (ret)
2644 goto rollback;
2645
2646 /* Force features update, since they are different for SW MACSec and
2647 * HW offloading cases.
2648 */
2649 netdev_update_features(dev);
2650
2651 rtnl_unlock();
2652 return 0;
2653
2654rollback:
2655 macsec->offload = prev_offload;
2656
2657 rtnl_unlock();
2658 return ret;
2659}
2660
2661static void get_tx_sa_stats(struct net_device *dev, int an,
2662 struct macsec_tx_sa *tx_sa,
2663 struct macsec_tx_sa_stats *sum)
2664{
2665 struct macsec_dev *macsec = macsec_priv(dev);
2666 int cpu;
2667
2668 /* If h/w offloading is available, propagate to the device */
2669 if (macsec_is_offloaded(macsec)) {
2670 const struct macsec_ops *ops;
2671 struct macsec_context ctx;
2672
2673 ops = macsec_get_ops(macsec, &ctx);
2674 if (ops) {
2675 ctx.sa.assoc_num = an;
2676 ctx.sa.tx_sa = tx_sa;
2677 ctx.stats.tx_sa_stats = sum;
2678 ctx.secy = &macsec_priv(dev)->secy;
2679 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2680 }
2681 return;
2682 }
2683
2684 for_each_possible_cpu(cpu) {
2685 const struct macsec_tx_sa_stats *stats =
2686 per_cpu_ptr(tx_sa->stats, cpu);
2687
2688 sum->OutPktsProtected += stats->OutPktsProtected;
2689 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2690 }
2691}
2692
2693static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2694{
2695 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2696 sum->OutPktsProtected) ||
2697 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2698 sum->OutPktsEncrypted))
2699 return -EMSGSIZE;
2700
2701 return 0;
2702}
2703
2704static void get_rx_sa_stats(struct net_device *dev,
2705 struct macsec_rx_sc *rx_sc, int an,
2706 struct macsec_rx_sa *rx_sa,
2707 struct macsec_rx_sa_stats *sum)
2708{
2709 struct macsec_dev *macsec = macsec_priv(dev);
2710 int cpu;
2711
2712 /* If h/w offloading is available, propagate to the device */
2713 if (macsec_is_offloaded(macsec)) {
2714 const struct macsec_ops *ops;
2715 struct macsec_context ctx;
2716
2717 ops = macsec_get_ops(macsec, &ctx);
2718 if (ops) {
2719 ctx.sa.assoc_num = an;
2720 ctx.sa.rx_sa = rx_sa;
2721 ctx.stats.rx_sa_stats = sum;
2722 ctx.secy = &macsec_priv(dev)->secy;
2723 ctx.rx_sc = rx_sc;
2724 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2725 }
2726 return;
2727 }
2728
2729 for_each_possible_cpu(cpu) {
2730 const struct macsec_rx_sa_stats *stats =
2731 per_cpu_ptr(rx_sa->stats, cpu);
2732
2733 sum->InPktsOK += stats->InPktsOK;
2734 sum->InPktsInvalid += stats->InPktsInvalid;
2735 sum->InPktsNotValid += stats->InPktsNotValid;
2736 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2737 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2738 }
2739}
2740
2741static int copy_rx_sa_stats(struct sk_buff *skb,
2742 struct macsec_rx_sa_stats *sum)
2743{
2744 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2745 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2746 sum->InPktsInvalid) ||
2747 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2748 sum->InPktsNotValid) ||
2749 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2750 sum->InPktsNotUsingSA) ||
2751 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2752 sum->InPktsUnusedSA))
2753 return -EMSGSIZE;
2754
2755 return 0;
2756}
2757
2758static void get_rx_sc_stats(struct net_device *dev,
2759 struct macsec_rx_sc *rx_sc,
2760 struct macsec_rx_sc_stats *sum)
2761{
2762 struct macsec_dev *macsec = macsec_priv(dev);
2763 int cpu;
2764
2765 /* If h/w offloading is available, propagate to the device */
2766 if (macsec_is_offloaded(macsec)) {
2767 const struct macsec_ops *ops;
2768 struct macsec_context ctx;
2769
2770 ops = macsec_get_ops(macsec, &ctx);
2771 if (ops) {
2772 ctx.stats.rx_sc_stats = sum;
2773 ctx.secy = &macsec_priv(dev)->secy;
2774 ctx.rx_sc = rx_sc;
2775 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2776 }
2777 return;
2778 }
2779
2780 for_each_possible_cpu(cpu) {
2781 const struct pcpu_rx_sc_stats *stats;
2782 struct macsec_rx_sc_stats tmp;
2783 unsigned int start;
2784
2785 stats = per_cpu_ptr(rx_sc->stats, cpu);
2786 do {
2787 start = u64_stats_fetch_begin_irq(&stats->syncp);
2788 memcpy(&tmp, &stats->stats, sizeof(tmp));
2789 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2790
2791 sum->InOctetsValidated += tmp.InOctetsValidated;
2792 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2793 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2794 sum->InPktsDelayed += tmp.InPktsDelayed;
2795 sum->InPktsOK += tmp.InPktsOK;
2796 sum->InPktsInvalid += tmp.InPktsInvalid;
2797 sum->InPktsLate += tmp.InPktsLate;
2798 sum->InPktsNotValid += tmp.InPktsNotValid;
2799 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2800 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2801 }
2802}
2803
2804static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2805{
2806 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2807 sum->InOctetsValidated,
2808 MACSEC_RXSC_STATS_ATTR_PAD) ||
2809 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2810 sum->InOctetsDecrypted,
2811 MACSEC_RXSC_STATS_ATTR_PAD) ||
2812 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2813 sum->InPktsUnchecked,
2814 MACSEC_RXSC_STATS_ATTR_PAD) ||
2815 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2816 sum->InPktsDelayed,
2817 MACSEC_RXSC_STATS_ATTR_PAD) ||
2818 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2819 sum->InPktsOK,
2820 MACSEC_RXSC_STATS_ATTR_PAD) ||
2821 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2822 sum->InPktsInvalid,
2823 MACSEC_RXSC_STATS_ATTR_PAD) ||
2824 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2825 sum->InPktsLate,
2826 MACSEC_RXSC_STATS_ATTR_PAD) ||
2827 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2828 sum->InPktsNotValid,
2829 MACSEC_RXSC_STATS_ATTR_PAD) ||
2830 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2831 sum->InPktsNotUsingSA,
2832 MACSEC_RXSC_STATS_ATTR_PAD) ||
2833 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2834 sum->InPktsUnusedSA,
2835 MACSEC_RXSC_STATS_ATTR_PAD))
2836 return -EMSGSIZE;
2837
2838 return 0;
2839}
2840
2841static void get_tx_sc_stats(struct net_device *dev,
2842 struct macsec_tx_sc_stats *sum)
2843{
2844 struct macsec_dev *macsec = macsec_priv(dev);
2845 int cpu;
2846
2847 /* If h/w offloading is available, propagate to the device */
2848 if (macsec_is_offloaded(macsec)) {
2849 const struct macsec_ops *ops;
2850 struct macsec_context ctx;
2851
2852 ops = macsec_get_ops(macsec, &ctx);
2853 if (ops) {
2854 ctx.stats.tx_sc_stats = sum;
2855 ctx.secy = &macsec_priv(dev)->secy;
2856 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2857 }
2858 return;
2859 }
2860
2861 for_each_possible_cpu(cpu) {
2862 const struct pcpu_tx_sc_stats *stats;
2863 struct macsec_tx_sc_stats tmp;
2864 unsigned int start;
2865
2866 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2867 do {
2868 start = u64_stats_fetch_begin_irq(&stats->syncp);
2869 memcpy(&tmp, &stats->stats, sizeof(tmp));
2870 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2871
2872 sum->OutPktsProtected += tmp.OutPktsProtected;
2873 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2874 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2875 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2876 }
2877}
2878
2879static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2880{
2881 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2882 sum->OutPktsProtected,
2883 MACSEC_TXSC_STATS_ATTR_PAD) ||
2884 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2885 sum->OutPktsEncrypted,
2886 MACSEC_TXSC_STATS_ATTR_PAD) ||
2887 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2888 sum->OutOctetsProtected,
2889 MACSEC_TXSC_STATS_ATTR_PAD) ||
2890 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2891 sum->OutOctetsEncrypted,
2892 MACSEC_TXSC_STATS_ATTR_PAD))
2893 return -EMSGSIZE;
2894
2895 return 0;
2896}
2897
2898static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2899{
2900 struct macsec_dev *macsec = macsec_priv(dev);
2901 int cpu;
2902
2903 /* If h/w offloading is available, propagate to the device */
2904 if (macsec_is_offloaded(macsec)) {
2905 const struct macsec_ops *ops;
2906 struct macsec_context ctx;
2907
2908 ops = macsec_get_ops(macsec, &ctx);
2909 if (ops) {
2910 ctx.stats.dev_stats = sum;
2911 ctx.secy = &macsec_priv(dev)->secy;
2912 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2913 }
2914 return;
2915 }
2916
2917 for_each_possible_cpu(cpu) {
2918 const struct pcpu_secy_stats *stats;
2919 struct macsec_dev_stats tmp;
2920 unsigned int start;
2921
2922 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2923 do {
2924 start = u64_stats_fetch_begin_irq(&stats->syncp);
2925 memcpy(&tmp, &stats->stats, sizeof(tmp));
2926 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2927
2928 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2929 sum->InPktsUntagged += tmp.InPktsUntagged;
2930 sum->OutPktsTooLong += tmp.OutPktsTooLong;
2931 sum->InPktsNoTag += tmp.InPktsNoTag;
2932 sum->InPktsBadTag += tmp.InPktsBadTag;
2933 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2934 sum->InPktsNoSCI += tmp.InPktsNoSCI;
2935 sum->InPktsOverrun += tmp.InPktsOverrun;
2936 }
2937}
2938
2939static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
2940{
2941 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2942 sum->OutPktsUntagged,
2943 MACSEC_SECY_STATS_ATTR_PAD) ||
2944 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2945 sum->InPktsUntagged,
2946 MACSEC_SECY_STATS_ATTR_PAD) ||
2947 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2948 sum->OutPktsTooLong,
2949 MACSEC_SECY_STATS_ATTR_PAD) ||
2950 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2951 sum->InPktsNoTag,
2952 MACSEC_SECY_STATS_ATTR_PAD) ||
2953 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2954 sum->InPktsBadTag,
2955 MACSEC_SECY_STATS_ATTR_PAD) ||
2956 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2957 sum->InPktsUnknownSCI,
2958 MACSEC_SECY_STATS_ATTR_PAD) ||
2959 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2960 sum->InPktsNoSCI,
2961 MACSEC_SECY_STATS_ATTR_PAD) ||
2962 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2963 sum->InPktsOverrun,
2964 MACSEC_SECY_STATS_ATTR_PAD))
2965 return -EMSGSIZE;
2966
2967 return 0;
2968}
2969
2970static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2971{
2972 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2973 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2974 MACSEC_ATTR_SECY);
2975 u64 csid;
2976
2977 if (!secy_nest)
2978 return 1;
2979
2980 switch (secy->key_len) {
2981 case MACSEC_GCM_AES_128_SAK_LEN:
2982 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
2983 break;
2984 case MACSEC_GCM_AES_256_SAK_LEN:
2985 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
2986 break;
2987 default:
2988 goto cancel;
2989 }
2990
2991 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
2992 MACSEC_SECY_ATTR_PAD) ||
2993 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
2994 csid, MACSEC_SECY_ATTR_PAD) ||
2995 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2996 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2997 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2998 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2999 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3000 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3001 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3002 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3003 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3004 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3005 goto cancel;
3006
3007 if (secy->replay_protect) {
3008 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3009 goto cancel;
3010 }
3011
3012 nla_nest_end(skb, secy_nest);
3013 return 0;
3014
3015cancel:
3016 nla_nest_cancel(skb, secy_nest);
3017 return 1;
3018}
3019
3020static noinline_for_stack int
3021dump_secy(struct macsec_secy *secy, struct net_device *dev,
3022 struct sk_buff *skb, struct netlink_callback *cb)
3023{
3024 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3025 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3026 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3027 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3028 struct macsec_dev *macsec = netdev_priv(dev);
3029 struct macsec_dev_stats dev_stats = {0, };
3030 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3031 struct nlattr *txsa_list, *rxsc_list;
3032 struct macsec_rx_sc *rx_sc;
3033 struct nlattr *attr;
3034 void *hdr;
3035 int i, j;
3036
3037 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3038 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3039 if (!hdr)
3040 return -EMSGSIZE;
3041
3042 genl_dump_check_consistent(cb, hdr);
3043
3044 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3045 goto nla_put_failure;
3046
3047 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3048 if (!attr)
3049 goto nla_put_failure;
3050 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3051 goto nla_put_failure;
3052 nla_nest_end(skb, attr);
3053
3054 if (nla_put_secy(secy, skb))
3055 goto nla_put_failure;
3056
3057 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3058 if (!attr)
3059 goto nla_put_failure;
3060
3061 get_tx_sc_stats(dev, &tx_sc_stats);
3062 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3063 nla_nest_cancel(skb, attr);
3064 goto nla_put_failure;
3065 }
3066 nla_nest_end(skb, attr);
3067
3068 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3069 if (!attr)
3070 goto nla_put_failure;
3071 get_secy_stats(dev, &dev_stats);
3072 if (copy_secy_stats(skb, &dev_stats)) {
3073 nla_nest_cancel(skb, attr);
3074 goto nla_put_failure;
3075 }
3076 nla_nest_end(skb, attr);
3077
3078 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3079 if (!txsa_list)
3080 goto nla_put_failure;
3081 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3082 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3083 struct nlattr *txsa_nest;
3084 u64 pn;
3085 int pn_len;
3086
3087 if (!tx_sa)
3088 continue;
3089
3090 txsa_nest = nla_nest_start_noflag(skb, j++);
3091 if (!txsa_nest) {
3092 nla_nest_cancel(skb, txsa_list);
3093 goto nla_put_failure;
3094 }
3095
3096 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3097 if (!attr) {
3098 nla_nest_cancel(skb, txsa_nest);
3099 nla_nest_cancel(skb, txsa_list);
3100 goto nla_put_failure;
3101 }
3102 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3103 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3104 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3105 nla_nest_cancel(skb, attr);
3106 nla_nest_cancel(skb, txsa_nest);
3107 nla_nest_cancel(skb, txsa_list);
3108 goto nla_put_failure;
3109 }
3110 nla_nest_end(skb, attr);
3111
3112 if (secy->xpn) {
3113 pn = tx_sa->next_pn;
3114 pn_len = MACSEC_XPN_PN_LEN;
3115 } else {
3116 pn = tx_sa->next_pn_halves.lower;
3117 pn_len = MACSEC_DEFAULT_PN_LEN;
3118 }
3119
3120 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3121 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3122 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3123 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3124 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3125 nla_nest_cancel(skb, txsa_nest);
3126 nla_nest_cancel(skb, txsa_list);
3127 goto nla_put_failure;
3128 }
3129
3130 nla_nest_end(skb, txsa_nest);
3131 }
3132 nla_nest_end(skb, txsa_list);
3133
3134 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3135 if (!rxsc_list)
3136 goto nla_put_failure;
3137
3138 j = 1;
3139 for_each_rxsc_rtnl(secy, rx_sc) {
3140 int k;
3141 struct nlattr *rxsa_list;
3142 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3143
3144 if (!rxsc_nest) {
3145 nla_nest_cancel(skb, rxsc_list);
3146 goto nla_put_failure;
3147 }
3148
3149 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3150 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3151 MACSEC_RXSC_ATTR_PAD)) {
3152 nla_nest_cancel(skb, rxsc_nest);
3153 nla_nest_cancel(skb, rxsc_list);
3154 goto nla_put_failure;
3155 }
3156
3157 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3158 if (!attr) {
3159 nla_nest_cancel(skb, rxsc_nest);
3160 nla_nest_cancel(skb, rxsc_list);
3161 goto nla_put_failure;
3162 }
3163 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3164 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3165 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3166 nla_nest_cancel(skb, attr);
3167 nla_nest_cancel(skb, rxsc_nest);
3168 nla_nest_cancel(skb, rxsc_list);
3169 goto nla_put_failure;
3170 }
3171 nla_nest_end(skb, attr);
3172
3173 rxsa_list = nla_nest_start_noflag(skb,
3174 MACSEC_RXSC_ATTR_SA_LIST);
3175 if (!rxsa_list) {
3176 nla_nest_cancel(skb, rxsc_nest);
3177 nla_nest_cancel(skb, rxsc_list);
3178 goto nla_put_failure;
3179 }
3180
3181 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3182 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3183 struct nlattr *rxsa_nest;
3184 u64 pn;
3185 int pn_len;
3186
3187 if (!rx_sa)
3188 continue;
3189
3190 rxsa_nest = nla_nest_start_noflag(skb, k++);
3191 if (!rxsa_nest) {
3192 nla_nest_cancel(skb, rxsa_list);
3193 nla_nest_cancel(skb, rxsc_nest);
3194 nla_nest_cancel(skb, rxsc_list);
3195 goto nla_put_failure;
3196 }
3197
3198 attr = nla_nest_start_noflag(skb,
3199 MACSEC_SA_ATTR_STATS);
3200 if (!attr) {
3201 nla_nest_cancel(skb, rxsa_list);
3202 nla_nest_cancel(skb, rxsc_nest);
3203 nla_nest_cancel(skb, rxsc_list);
3204 goto nla_put_failure;
3205 }
3206 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3207 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3208 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3209 nla_nest_cancel(skb, attr);
3210 nla_nest_cancel(skb, rxsa_list);
3211 nla_nest_cancel(skb, rxsc_nest);
3212 nla_nest_cancel(skb, rxsc_list);
3213 goto nla_put_failure;
3214 }
3215 nla_nest_end(skb, attr);
3216
3217 if (secy->xpn) {
3218 pn = rx_sa->next_pn;
3219 pn_len = MACSEC_XPN_PN_LEN;
3220 } else {
3221 pn = rx_sa->next_pn_halves.lower;
3222 pn_len = MACSEC_DEFAULT_PN_LEN;
3223 }
3224
3225 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3226 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3227 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3228 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3229 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3230 nla_nest_cancel(skb, rxsa_nest);
3231 nla_nest_cancel(skb, rxsc_nest);
3232 nla_nest_cancel(skb, rxsc_list);
3233 goto nla_put_failure;
3234 }
3235 nla_nest_end(skb, rxsa_nest);
3236 }
3237
3238 nla_nest_end(skb, rxsa_list);
3239 nla_nest_end(skb, rxsc_nest);
3240 }
3241
3242 nla_nest_end(skb, rxsc_list);
3243
3244 genlmsg_end(skb, hdr);
3245
3246 return 0;
3247
3248nla_put_failure:
3249 genlmsg_cancel(skb, hdr);
3250 return -EMSGSIZE;
3251}
3252
3253static int macsec_generation = 1; /* protected by RTNL */
3254
3255static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3256{
3257 struct net *net = sock_net(skb->sk);
3258 struct net_device *dev;
3259 int dev_idx, d;
3260
3261 dev_idx = cb->args[0];
3262
3263 d = 0;
3264 rtnl_lock();
3265
3266 cb->seq = macsec_generation;
3267
3268 for_each_netdev(net, dev) {
3269 struct macsec_secy *secy;
3270
3271 if (d < dev_idx)
3272 goto next;
3273
3274 if (!netif_is_macsec(dev))
3275 goto next;
3276
3277 secy = &macsec_priv(dev)->secy;
3278 if (dump_secy(secy, dev, skb, cb) < 0)
3279 goto done;
3280next:
3281 d++;
3282 }
3283
3284done:
3285 rtnl_unlock();
3286 cb->args[0] = d;
3287 return skb->len;
3288}
3289
3290static const struct genl_ops macsec_genl_ops[] = {
3291 {
3292 .cmd = MACSEC_CMD_GET_TXSC,
3293 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3294 .dumpit = macsec_dump_txsc,
3295 },
3296 {
3297 .cmd = MACSEC_CMD_ADD_RXSC,
3298 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3299 .doit = macsec_add_rxsc,
3300 .flags = GENL_ADMIN_PERM,
3301 },
3302 {
3303 .cmd = MACSEC_CMD_DEL_RXSC,
3304 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3305 .doit = macsec_del_rxsc,
3306 .flags = GENL_ADMIN_PERM,
3307 },
3308 {
3309 .cmd = MACSEC_CMD_UPD_RXSC,
3310 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3311 .doit = macsec_upd_rxsc,
3312 .flags = GENL_ADMIN_PERM,
3313 },
3314 {
3315 .cmd = MACSEC_CMD_ADD_TXSA,
3316 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3317 .doit = macsec_add_txsa,
3318 .flags = GENL_ADMIN_PERM,
3319 },
3320 {
3321 .cmd = MACSEC_CMD_DEL_TXSA,
3322 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3323 .doit = macsec_del_txsa,
3324 .flags = GENL_ADMIN_PERM,
3325 },
3326 {
3327 .cmd = MACSEC_CMD_UPD_TXSA,
3328 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3329 .doit = macsec_upd_txsa,
3330 .flags = GENL_ADMIN_PERM,
3331 },
3332 {
3333 .cmd = MACSEC_CMD_ADD_RXSA,
3334 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3335 .doit = macsec_add_rxsa,
3336 .flags = GENL_ADMIN_PERM,
3337 },
3338 {
3339 .cmd = MACSEC_CMD_DEL_RXSA,
3340 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3341 .doit = macsec_del_rxsa,
3342 .flags = GENL_ADMIN_PERM,
3343 },
3344 {
3345 .cmd = MACSEC_CMD_UPD_RXSA,
3346 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3347 .doit = macsec_upd_rxsa,
3348 .flags = GENL_ADMIN_PERM,
3349 },
3350 {
3351 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3352 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3353 .doit = macsec_upd_offload,
3354 .flags = GENL_ADMIN_PERM,
3355 },
3356};
3357
3358static struct genl_family macsec_fam __ro_after_init = {
3359 .name = MACSEC_GENL_NAME,
3360 .hdrsize = 0,
3361 .version = MACSEC_GENL_VERSION,
3362 .maxattr = MACSEC_ATTR_MAX,
3363 .policy = macsec_genl_policy,
3364 .netnsok = true,
3365 .module = THIS_MODULE,
3366 .ops = macsec_genl_ops,
3367 .n_ops = ARRAY_SIZE(macsec_genl_ops),
3368};
3369
3370static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3371 struct net_device *dev)
3372{
3373 struct macsec_dev *macsec = netdev_priv(dev);
3374 struct macsec_secy *secy = &macsec->secy;
3375 struct pcpu_secy_stats *secy_stats;
3376 int ret, len;
3377
3378 if (macsec_is_offloaded(netdev_priv(dev))) {
3379 skb->dev = macsec->real_dev;
3380 return dev_queue_xmit(skb);
3381 }
3382
3383 /* 10.5 */
3384 if (!secy->protect_frames) {
3385 secy_stats = this_cpu_ptr(macsec->stats);
3386 u64_stats_update_begin(&secy_stats->syncp);
3387 secy_stats->stats.OutPktsUntagged++;
3388 u64_stats_update_end(&secy_stats->syncp);
3389 skb->dev = macsec->real_dev;
3390 len = skb->len;
3391 ret = dev_queue_xmit(skb);
3392 count_tx(dev, ret, len);
3393 return ret;
3394 }
3395
3396 if (!secy->operational) {
3397 kfree_skb(skb);
3398 dev->stats.tx_dropped++;
3399 return NETDEV_TX_OK;
3400 }
3401
3402 skb = macsec_encrypt(skb, dev);
3403 if (IS_ERR(skb)) {
3404 if (PTR_ERR(skb) != -EINPROGRESS)
3405 dev->stats.tx_dropped++;
3406 return NETDEV_TX_OK;
3407 }
3408
3409 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3410
3411 macsec_encrypt_finish(skb, dev);
3412 len = skb->len;
3413 ret = dev_queue_xmit(skb);
3414 count_tx(dev, ret, len);
3415 return ret;
3416}
3417
3418#define SW_MACSEC_FEATURES \
3419 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3420
3421/* If h/w offloading is enabled, use real device features save for
3422 * VLAN_FEATURES - they require additional ops
3423 * HW_MACSEC - no reason to report it
3424 */
3425#define REAL_DEV_FEATURES(dev) \
3426 ((dev)->features & ~(NETIF_F_VLAN_FEATURES | NETIF_F_HW_MACSEC))
3427
3428static int macsec_dev_init(struct net_device *dev)
3429{
3430 struct macsec_dev *macsec = macsec_priv(dev);
3431 struct net_device *real_dev = macsec->real_dev;
3432 int err;
3433
3434 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3435 if (!dev->tstats)
3436 return -ENOMEM;
3437
3438 err = gro_cells_init(&macsec->gro_cells, dev);
3439 if (err) {
3440 free_percpu(dev->tstats);
3441 return err;
3442 }
3443
3444 if (macsec_is_offloaded(macsec)) {
3445 dev->features = REAL_DEV_FEATURES(real_dev);
3446 } else {
3447 dev->features = real_dev->features & SW_MACSEC_FEATURES;
3448 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3449 }
3450
3451 dev->needed_headroom = real_dev->needed_headroom +
3452 MACSEC_NEEDED_HEADROOM;
3453 dev->needed_tailroom = real_dev->needed_tailroom +
3454 MACSEC_NEEDED_TAILROOM;
3455
3456 if (is_zero_ether_addr(dev->dev_addr))
3457 eth_hw_addr_inherit(dev, real_dev);
3458 if (is_zero_ether_addr(dev->broadcast))
3459 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3460
3461 return 0;
3462}
3463
3464static void macsec_dev_uninit(struct net_device *dev)
3465{
3466 struct macsec_dev *macsec = macsec_priv(dev);
3467
3468 gro_cells_destroy(&macsec->gro_cells);
3469 free_percpu(dev->tstats);
3470}
3471
3472static netdev_features_t macsec_fix_features(struct net_device *dev,
3473 netdev_features_t features)
3474{
3475 struct macsec_dev *macsec = macsec_priv(dev);
3476 struct net_device *real_dev = macsec->real_dev;
3477
3478 if (macsec_is_offloaded(macsec))
3479 return REAL_DEV_FEATURES(real_dev);
3480
3481 features &= (real_dev->features & SW_MACSEC_FEATURES) |
3482 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3483 features |= NETIF_F_LLTX;
3484
3485 return features;
3486}
3487
3488static int macsec_dev_open(struct net_device *dev)
3489{
3490 struct macsec_dev *macsec = macsec_priv(dev);
3491 struct net_device *real_dev = macsec->real_dev;
3492 int err;
3493
3494 err = dev_uc_add(real_dev, dev->dev_addr);
3495 if (err < 0)
3496 return err;
3497
3498 if (dev->flags & IFF_ALLMULTI) {
3499 err = dev_set_allmulti(real_dev, 1);
3500 if (err < 0)
3501 goto del_unicast;
3502 }
3503
3504 if (dev->flags & IFF_PROMISC) {
3505 err = dev_set_promiscuity(real_dev, 1);
3506 if (err < 0)
3507 goto clear_allmulti;
3508 }
3509
3510 /* If h/w offloading is available, propagate to the device */
3511 if (macsec_is_offloaded(macsec)) {
3512 const struct macsec_ops *ops;
3513 struct macsec_context ctx;
3514
3515 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3516 if (!ops) {
3517 err = -EOPNOTSUPP;
3518 goto clear_allmulti;
3519 }
3520
3521 ctx.secy = &macsec->secy;
3522 err = macsec_offload(ops->mdo_dev_open, &ctx);
3523 if (err)
3524 goto clear_allmulti;
3525 }
3526
3527 if (netif_carrier_ok(real_dev))
3528 netif_carrier_on(dev);
3529
3530 return 0;
3531clear_allmulti:
3532 if (dev->flags & IFF_ALLMULTI)
3533 dev_set_allmulti(real_dev, -1);
3534del_unicast:
3535 dev_uc_del(real_dev, dev->dev_addr);
3536 netif_carrier_off(dev);
3537 return err;
3538}
3539
3540static int macsec_dev_stop(struct net_device *dev)
3541{
3542 struct macsec_dev *macsec = macsec_priv(dev);
3543 struct net_device *real_dev = macsec->real_dev;
3544
3545 netif_carrier_off(dev);
3546
3547 /* If h/w offloading is available, propagate to the device */
3548 if (macsec_is_offloaded(macsec)) {
3549 const struct macsec_ops *ops;
3550 struct macsec_context ctx;
3551
3552 ops = macsec_get_ops(macsec, &ctx);
3553 if (ops) {
3554 ctx.secy = &macsec->secy;
3555 macsec_offload(ops->mdo_dev_stop, &ctx);
3556 }
3557 }
3558
3559 dev_mc_unsync(real_dev, dev);
3560 dev_uc_unsync(real_dev, dev);
3561
3562 if (dev->flags & IFF_ALLMULTI)
3563 dev_set_allmulti(real_dev, -1);
3564
3565 if (dev->flags & IFF_PROMISC)
3566 dev_set_promiscuity(real_dev, -1);
3567
3568 dev_uc_del(real_dev, dev->dev_addr);
3569
3570 return 0;
3571}
3572
3573static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3574{
3575 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3576
3577 if (!(dev->flags & IFF_UP))
3578 return;
3579
3580 if (change & IFF_ALLMULTI)
3581 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3582
3583 if (change & IFF_PROMISC)
3584 dev_set_promiscuity(real_dev,
3585 dev->flags & IFF_PROMISC ? 1 : -1);
3586}
3587
3588static void macsec_dev_set_rx_mode(struct net_device *dev)
3589{
3590 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3591
3592 dev_mc_sync(real_dev, dev);
3593 dev_uc_sync(real_dev, dev);
3594}
3595
3596static int macsec_set_mac_address(struct net_device *dev, void *p)
3597{
3598 struct macsec_dev *macsec = macsec_priv(dev);
3599 struct net_device *real_dev = macsec->real_dev;
3600 struct sockaddr *addr = p;
3601 int err;
3602
3603 if (!is_valid_ether_addr(addr->sa_data))
3604 return -EADDRNOTAVAIL;
3605
3606 if (!(dev->flags & IFF_UP))
3607 goto out;
3608
3609 err = dev_uc_add(real_dev, addr->sa_data);
3610 if (err < 0)
3611 return err;
3612
3613 dev_uc_del(real_dev, dev->dev_addr);
3614
3615out:
3616 ether_addr_copy(dev->dev_addr, addr->sa_data);
3617 macsec->secy.sci = dev_to_sci(dev, MACSEC_PORT_ES);
3618
3619 /* If h/w offloading is available, propagate to the device */
3620 if (macsec_is_offloaded(macsec)) {
3621 const struct macsec_ops *ops;
3622 struct macsec_context ctx;
3623
3624 ops = macsec_get_ops(macsec, &ctx);
3625 if (ops) {
3626 ctx.secy = &macsec->secy;
3627 macsec_offload(ops->mdo_upd_secy, &ctx);
3628 }
3629 }
3630
3631 return 0;
3632}
3633
3634static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3635{
3636 struct macsec_dev *macsec = macsec_priv(dev);
3637 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3638
3639 if (macsec->real_dev->mtu - extra < new_mtu)
3640 return -ERANGE;
3641
3642 dev->mtu = new_mtu;
3643
3644 return 0;
3645}
3646
3647static void macsec_get_stats64(struct net_device *dev,
3648 struct rtnl_link_stats64 *s)
3649{
3650 int cpu;
3651
3652 if (!dev->tstats)
3653 return;
3654
3655 for_each_possible_cpu(cpu) {
3656 struct pcpu_sw_netstats *stats;
3657 struct pcpu_sw_netstats tmp;
3658 int start;
3659
3660 stats = per_cpu_ptr(dev->tstats, cpu);
3661 do {
3662 start = u64_stats_fetch_begin_irq(&stats->syncp);
3663 tmp.rx_packets = stats->rx_packets;
3664 tmp.rx_bytes = stats->rx_bytes;
3665 tmp.tx_packets = stats->tx_packets;
3666 tmp.tx_bytes = stats->tx_bytes;
3667 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
3668
3669 s->rx_packets += tmp.rx_packets;
3670 s->rx_bytes += tmp.rx_bytes;
3671 s->tx_packets += tmp.tx_packets;
3672 s->tx_bytes += tmp.tx_bytes;
3673 }
3674
3675 s->rx_dropped = dev->stats.rx_dropped;
3676 s->tx_dropped = dev->stats.tx_dropped;
3677}
3678
3679static int macsec_get_iflink(const struct net_device *dev)
3680{
3681 return macsec_priv(dev)->real_dev->ifindex;
3682}
3683
3684static const struct net_device_ops macsec_netdev_ops = {
3685 .ndo_init = macsec_dev_init,
3686 .ndo_uninit = macsec_dev_uninit,
3687 .ndo_open = macsec_dev_open,
3688 .ndo_stop = macsec_dev_stop,
3689 .ndo_fix_features = macsec_fix_features,
3690 .ndo_change_mtu = macsec_change_mtu,
3691 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3692 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3693 .ndo_set_mac_address = macsec_set_mac_address,
3694 .ndo_start_xmit = macsec_start_xmit,
3695 .ndo_get_stats64 = macsec_get_stats64,
3696 .ndo_get_iflink = macsec_get_iflink,
3697};
3698
3699static const struct device_type macsec_type = {
3700 .name = "macsec",
3701};
3702
3703static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3704 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3705 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3706 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3707 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3708 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3709 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3710 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3711 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3712 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3713 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3714 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3715 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3716 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3717};
3718
3719static void macsec_free_netdev(struct net_device *dev)
3720{
3721 struct macsec_dev *macsec = macsec_priv(dev);
3722
3723 free_percpu(macsec->stats);
3724 free_percpu(macsec->secy.tx_sc.stats);
3725
3726}
3727
3728static void macsec_setup(struct net_device *dev)
3729{
3730 ether_setup(dev);
3731 dev->min_mtu = 0;
3732 dev->max_mtu = ETH_MAX_MTU;
3733 dev->priv_flags |= IFF_NO_QUEUE;
3734 dev->netdev_ops = &macsec_netdev_ops;
3735 dev->needs_free_netdev = true;
3736 dev->priv_destructor = macsec_free_netdev;
3737 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3738
3739 eth_zero_addr(dev->broadcast);
3740}
3741
3742static int macsec_changelink_common(struct net_device *dev,
3743 struct nlattr *data[])
3744{
3745 struct macsec_secy *secy;
3746 struct macsec_tx_sc *tx_sc;
3747
3748 secy = &macsec_priv(dev)->secy;
3749 tx_sc = &secy->tx_sc;
3750
3751 if (data[IFLA_MACSEC_ENCODING_SA]) {
3752 struct macsec_tx_sa *tx_sa;
3753
3754 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3755 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3756
3757 secy->operational = tx_sa && tx_sa->active;
3758 }
3759
3760 if (data[IFLA_MACSEC_WINDOW])
3761 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3762
3763 if (data[IFLA_MACSEC_ENCRYPT])
3764 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3765
3766 if (data[IFLA_MACSEC_PROTECT])
3767 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3768
3769 if (data[IFLA_MACSEC_INC_SCI])
3770 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3771
3772 if (data[IFLA_MACSEC_ES])
3773 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3774
3775 if (data[IFLA_MACSEC_SCB])
3776 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3777
3778 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3779 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3780
3781 if (data[IFLA_MACSEC_VALIDATION])
3782 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3783
3784 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3785 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3786 case MACSEC_CIPHER_ID_GCM_AES_128:
3787 case MACSEC_DEFAULT_CIPHER_ID:
3788 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3789 secy->xpn = false;
3790 break;
3791 case MACSEC_CIPHER_ID_GCM_AES_256:
3792 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3793 secy->xpn = false;
3794 break;
3795 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3796 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3797 secy->xpn = true;
3798 break;
3799 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3800 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3801 secy->xpn = true;
3802 break;
3803 default:
3804 return -EINVAL;
3805 }
3806 }
3807
3808 return 0;
3809}
3810
3811static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3812 struct nlattr *data[],
3813 struct netlink_ext_ack *extack)
3814{
3815 struct macsec_dev *macsec = macsec_priv(dev);
3816 struct macsec_tx_sc tx_sc;
3817 struct macsec_secy secy;
3818 int ret;
3819
3820 if (!data)
3821 return 0;
3822
3823 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3824 data[IFLA_MACSEC_ICV_LEN] ||
3825 data[IFLA_MACSEC_SCI] ||
3826 data[IFLA_MACSEC_PORT])
3827 return -EINVAL;
3828
3829 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3830 * propagation fails, to revert macsec_changelink_common.
3831 */
3832 memcpy(&secy, &macsec->secy, sizeof(secy));
3833 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3834
3835 ret = macsec_changelink_common(dev, data);
3836 if (ret)
3837 return ret;
3838
3839 /* If h/w offloading is available, propagate to the device */
3840 if (macsec_is_offloaded(macsec)) {
3841 const struct macsec_ops *ops;
3842 struct macsec_context ctx;
3843 int ret;
3844
3845 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3846 if (!ops) {
3847 ret = -EOPNOTSUPP;
3848 goto cleanup;
3849 }
3850
3851 ctx.secy = &macsec->secy;
3852 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3853 if (ret)
3854 goto cleanup;
3855 }
3856
3857 return 0;
3858
3859cleanup:
3860 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3861 memcpy(&macsec->secy, &secy, sizeof(secy));
3862
3863 return ret;
3864}
3865
3866static void macsec_del_dev(struct macsec_dev *macsec)
3867{
3868 int i;
3869
3870 while (macsec->secy.rx_sc) {
3871 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3872
3873 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3874 free_rx_sc(rx_sc);
3875 }
3876
3877 for (i = 0; i < MACSEC_NUM_AN; i++) {
3878 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3879
3880 if (sa) {
3881 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3882 clear_tx_sa(sa);
3883 }
3884 }
3885}
3886
3887static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3888{
3889 struct macsec_dev *macsec = macsec_priv(dev);
3890 struct net_device *real_dev = macsec->real_dev;
3891
3892 unregister_netdevice_queue(dev, head);
3893 list_del_rcu(&macsec->secys);
3894 macsec_del_dev(macsec);
3895 netdev_upper_dev_unlink(real_dev, dev);
3896
3897 macsec_generation++;
3898}
3899
3900static void macsec_dellink(struct net_device *dev, struct list_head *head)
3901{
3902 struct macsec_dev *macsec = macsec_priv(dev);
3903 struct net_device *real_dev = macsec->real_dev;
3904 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3905
3906 /* If h/w offloading is available, propagate to the device */
3907 if (macsec_is_offloaded(macsec)) {
3908 const struct macsec_ops *ops;
3909 struct macsec_context ctx;
3910
3911 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3912 if (ops) {
3913 ctx.secy = &macsec->secy;
3914 macsec_offload(ops->mdo_del_secy, &ctx);
3915 }
3916 }
3917
3918 macsec_common_dellink(dev, head);
3919
3920 if (list_empty(&rxd->secys)) {
3921 netdev_rx_handler_unregister(real_dev);
3922 kfree(rxd);
3923 }
3924}
3925
3926static int register_macsec_dev(struct net_device *real_dev,
3927 struct net_device *dev)
3928{
3929 struct macsec_dev *macsec = macsec_priv(dev);
3930 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3931
3932 if (!rxd) {
3933 int err;
3934
3935 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3936 if (!rxd)
3937 return -ENOMEM;
3938
3939 INIT_LIST_HEAD(&rxd->secys);
3940
3941 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3942 rxd);
3943 if (err < 0) {
3944 kfree(rxd);
3945 return err;
3946 }
3947 }
3948
3949 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3950 return 0;
3951}
3952
3953static bool sci_exists(struct net_device *dev, sci_t sci)
3954{
3955 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3956 struct macsec_dev *macsec;
3957
3958 list_for_each_entry(macsec, &rxd->secys, secys) {
3959 if (macsec->secy.sci == sci)
3960 return true;
3961 }
3962
3963 return false;
3964}
3965
3966static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3967{
3968 struct macsec_dev *macsec = macsec_priv(dev);
3969 struct macsec_secy *secy = &macsec->secy;
3970
3971 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3972 if (!macsec->stats)
3973 return -ENOMEM;
3974
3975 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3976 if (!secy->tx_sc.stats) {
3977 free_percpu(macsec->stats);
3978 return -ENOMEM;
3979 }
3980
3981 if (sci == MACSEC_UNDEF_SCI)
3982 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3983
3984 secy->netdev = dev;
3985 secy->operational = true;
3986 secy->key_len = DEFAULT_SAK_LEN;
3987 secy->icv_len = icv_len;
3988 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3989 secy->protect_frames = true;
3990 secy->replay_protect = false;
3991 secy->xpn = DEFAULT_XPN;
3992
3993 secy->sci = sci;
3994 secy->tx_sc.active = true;
3995 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3996 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3997 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3998 secy->tx_sc.end_station = false;
3999 secy->tx_sc.scb = false;
4000
4001 return 0;
4002}
4003
4004static struct lock_class_key macsec_netdev_addr_lock_key;
4005
4006static int macsec_newlink(struct net *net, struct net_device *dev,
4007 struct nlattr *tb[], struct nlattr *data[],
4008 struct netlink_ext_ack *extack)
4009{
4010 struct macsec_dev *macsec = macsec_priv(dev);
4011 rx_handler_func_t *rx_handler;
4012 u8 icv_len = DEFAULT_ICV_LEN;
4013 struct net_device *real_dev;
4014 int err, mtu;
4015 sci_t sci;
4016
4017 if (!tb[IFLA_LINK])
4018 return -EINVAL;
4019 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4020 if (!real_dev)
4021 return -ENODEV;
4022 if (real_dev->type != ARPHRD_ETHER)
4023 return -EINVAL;
4024
4025 dev->priv_flags |= IFF_MACSEC;
4026
4027 macsec->real_dev = real_dev;
4028
4029 if (data && data[IFLA_MACSEC_OFFLOAD])
4030 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4031 else
4032 /* MACsec offloading is off by default */
4033 macsec->offload = MACSEC_OFFLOAD_OFF;
4034
4035 /* Check if the offloading mode is supported by the underlying layers */
4036 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4037 !macsec_check_offload(macsec->offload, macsec))
4038 return -EOPNOTSUPP;
4039
4040 if (data && data[IFLA_MACSEC_ICV_LEN])
4041 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4042 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4043 if (mtu < 0)
4044 dev->mtu = 0;
4045 else
4046 dev->mtu = mtu;
4047
4048 rx_handler = rtnl_dereference(real_dev->rx_handler);
4049 if (rx_handler && rx_handler != macsec_handle_frame)
4050 return -EBUSY;
4051
4052 err = register_netdevice(dev);
4053 if (err < 0)
4054 return err;
4055
4056 netdev_lockdep_set_classes(dev);
4057 lockdep_set_class(&dev->addr_list_lock,
4058 &macsec_netdev_addr_lock_key);
4059
4060 err = netdev_upper_dev_link(real_dev, dev, extack);
4061 if (err < 0)
4062 goto unregister;
4063
4064 /* need to be already registered so that ->init has run and
4065 * the MAC addr is set
4066 */
4067 if (data && data[IFLA_MACSEC_SCI])
4068 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4069 else if (data && data[IFLA_MACSEC_PORT])
4070 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4071 else
4072 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4073
4074 if (rx_handler && sci_exists(real_dev, sci)) {
4075 err = -EBUSY;
4076 goto unlink;
4077 }
4078
4079 err = macsec_add_dev(dev, sci, icv_len);
4080 if (err)
4081 goto unlink;
4082
4083 if (data) {
4084 err = macsec_changelink_common(dev, data);
4085 if (err)
4086 goto del_dev;
4087 }
4088
4089 /* If h/w offloading is available, propagate to the device */
4090 if (macsec_is_offloaded(macsec)) {
4091 const struct macsec_ops *ops;
4092 struct macsec_context ctx;
4093
4094 ops = macsec_get_ops(macsec, &ctx);
4095 if (ops) {
4096 ctx.secy = &macsec->secy;
4097 err = macsec_offload(ops->mdo_add_secy, &ctx);
4098 if (err)
4099 goto del_dev;
4100 }
4101 }
4102
4103 err = register_macsec_dev(real_dev, dev);
4104 if (err < 0)
4105 goto del_dev;
4106
4107 netif_stacked_transfer_operstate(real_dev, dev);
4108 linkwatch_fire_event(dev);
4109
4110 macsec_generation++;
4111
4112 return 0;
4113
4114del_dev:
4115 macsec_del_dev(macsec);
4116unlink:
4117 netdev_upper_dev_unlink(real_dev, dev);
4118unregister:
4119 unregister_netdevice(dev);
4120 return err;
4121}
4122
4123static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4124 struct netlink_ext_ack *extack)
4125{
4126 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4127 u8 icv_len = DEFAULT_ICV_LEN;
4128 int flag;
4129 bool es, scb, sci;
4130
4131 if (!data)
4132 return 0;
4133
4134 if (data[IFLA_MACSEC_CIPHER_SUITE])
4135 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4136
4137 if (data[IFLA_MACSEC_ICV_LEN]) {
4138 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4139 if (icv_len != DEFAULT_ICV_LEN) {
4140 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4141 struct crypto_aead *dummy_tfm;
4142
4143 dummy_tfm = macsec_alloc_tfm(dummy_key,
4144 DEFAULT_SAK_LEN,
4145 icv_len);
4146 if (IS_ERR(dummy_tfm))
4147 return PTR_ERR(dummy_tfm);
4148 crypto_free_aead(dummy_tfm);
4149 }
4150 }
4151
4152 switch (csid) {
4153 case MACSEC_CIPHER_ID_GCM_AES_128:
4154 case MACSEC_CIPHER_ID_GCM_AES_256:
4155 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4156 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4157 case MACSEC_DEFAULT_CIPHER_ID:
4158 if (icv_len < MACSEC_MIN_ICV_LEN ||
4159 icv_len > MACSEC_STD_ICV_LEN)
4160 return -EINVAL;
4161 break;
4162 default:
4163 return -EINVAL;
4164 }
4165
4166 if (data[IFLA_MACSEC_ENCODING_SA]) {
4167 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4168 return -EINVAL;
4169 }
4170
4171 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4172 flag < IFLA_MACSEC_VALIDATION;
4173 flag++) {
4174 if (data[flag]) {
4175 if (nla_get_u8(data[flag]) > 1)
4176 return -EINVAL;
4177 }
4178 }
4179
4180 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4181 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4182 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4183
4184 if ((sci && (scb || es)) || (scb && es))
4185 return -EINVAL;
4186
4187 if (data[IFLA_MACSEC_VALIDATION] &&
4188 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4189 return -EINVAL;
4190
4191 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4192 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4193 !data[IFLA_MACSEC_WINDOW])
4194 return -EINVAL;
4195
4196 return 0;
4197}
4198
4199static struct net *macsec_get_link_net(const struct net_device *dev)
4200{
4201 return dev_net(macsec_priv(dev)->real_dev);
4202}
4203
4204static size_t macsec_get_size(const struct net_device *dev)
4205{
4206 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4207 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4208 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4209 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4210 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4211 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4212 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4213 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4214 nla_total_size(1) + /* IFLA_MACSEC_ES */
4215 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4216 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4217 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4218 0;
4219}
4220
4221static int macsec_fill_info(struct sk_buff *skb,
4222 const struct net_device *dev)
4223{
4224 struct macsec_secy *secy = &macsec_priv(dev)->secy;
4225 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
4226 u64 csid;
4227
4228 switch (secy->key_len) {
4229 case MACSEC_GCM_AES_128_SAK_LEN:
4230 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4231 break;
4232 case MACSEC_GCM_AES_256_SAK_LEN:
4233 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4234 break;
4235 default:
4236 goto nla_put_failure;
4237 }
4238
4239 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4240 IFLA_MACSEC_PAD) ||
4241 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4242 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4243 csid, IFLA_MACSEC_PAD) ||
4244 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4245 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4246 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4247 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4248 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4249 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4250 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4251 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4252 0)
4253 goto nla_put_failure;
4254
4255 if (secy->replay_protect) {
4256 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4257 goto nla_put_failure;
4258 }
4259
4260 return 0;
4261
4262nla_put_failure:
4263 return -EMSGSIZE;
4264}
4265
4266static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4267 .kind = "macsec",
4268 .priv_size = sizeof(struct macsec_dev),
4269 .maxtype = IFLA_MACSEC_MAX,
4270 .policy = macsec_rtnl_policy,
4271 .setup = macsec_setup,
4272 .validate = macsec_validate_attr,
4273 .newlink = macsec_newlink,
4274 .changelink = macsec_changelink,
4275 .dellink = macsec_dellink,
4276 .get_size = macsec_get_size,
4277 .fill_info = macsec_fill_info,
4278 .get_link_net = macsec_get_link_net,
4279};
4280
4281static bool is_macsec_master(struct net_device *dev)
4282{
4283 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4284}
4285
4286static int macsec_notify(struct notifier_block *this, unsigned long event,
4287 void *ptr)
4288{
4289 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4290 LIST_HEAD(head);
4291
4292 if (!is_macsec_master(real_dev))
4293 return NOTIFY_DONE;
4294
4295 switch (event) {
4296 case NETDEV_DOWN:
4297 case NETDEV_UP:
4298 case NETDEV_CHANGE: {
4299 struct macsec_dev *m, *n;
4300 struct macsec_rxh_data *rxd;
4301
4302 rxd = macsec_data_rtnl(real_dev);
4303 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4304 struct net_device *dev = m->secy.netdev;
4305
4306 netif_stacked_transfer_operstate(real_dev, dev);
4307 }
4308 break;
4309 }
4310 case NETDEV_UNREGISTER: {
4311 struct macsec_dev *m, *n;
4312 struct macsec_rxh_data *rxd;
4313
4314 rxd = macsec_data_rtnl(real_dev);
4315 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4316 macsec_common_dellink(m->secy.netdev, &head);
4317 }
4318
4319 netdev_rx_handler_unregister(real_dev);
4320 kfree(rxd);
4321
4322 unregister_netdevice_many(&head);
4323 break;
4324 }
4325 case NETDEV_CHANGEMTU: {
4326 struct macsec_dev *m;
4327 struct macsec_rxh_data *rxd;
4328
4329 rxd = macsec_data_rtnl(real_dev);
4330 list_for_each_entry(m, &rxd->secys, secys) {
4331 struct net_device *dev = m->secy.netdev;
4332 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4333 macsec_extra_len(true));
4334
4335 if (dev->mtu > mtu)
4336 dev_set_mtu(dev, mtu);
4337 }
4338 }
4339 }
4340
4341 return NOTIFY_OK;
4342}
4343
4344static struct notifier_block macsec_notifier = {
4345 .notifier_call = macsec_notify,
4346};
4347
4348static int __init macsec_init(void)
4349{
4350 int err;
4351
4352 pr_info("MACsec IEEE 802.1AE\n");
4353 err = register_netdevice_notifier(&macsec_notifier);
4354 if (err)
4355 return err;
4356
4357 err = rtnl_link_register(&macsec_link_ops);
4358 if (err)
4359 goto notifier;
4360
4361 err = genl_register_family(&macsec_fam);
4362 if (err)
4363 goto rtnl;
4364
4365 return 0;
4366
4367rtnl:
4368 rtnl_link_unregister(&macsec_link_ops);
4369notifier:
4370 unregister_netdevice_notifier(&macsec_notifier);
4371 return err;
4372}
4373
4374static void __exit macsec_exit(void)
4375{
4376 genl_unregister_family(&macsec_fam);
4377 rtnl_link_unregister(&macsec_link_ops);
4378 unregister_netdevice_notifier(&macsec_notifier);
4379 rcu_barrier();
4380}
4381
4382module_init(macsec_init);
4383module_exit(macsec_exit);
4384
4385MODULE_ALIAS_RTNL_LINK("macsec");
4386MODULE_ALIAS_GENL_FAMILY("macsec");
4387
4388MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4389MODULE_LICENSE("GPL v2");