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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 <net/dst_metadata.h>
22#include <linux/phy.h>
23#include <linux/byteorder/generic.h>
24#include <linux/if_arp.h>
25
26#include <uapi/linux/if_macsec.h>
27
28/* SecTAG length = macsec_eth_header without the optional SCI */
29#define MACSEC_TAG_LEN 6
30
31struct macsec_eth_header {
32 struct ethhdr eth;
33 /* SecTAG */
34 u8 tci_an;
35#if defined(__LITTLE_ENDIAN_BITFIELD)
36 u8 short_length:6,
37 unused:2;
38#elif defined(__BIG_ENDIAN_BITFIELD)
39 u8 unused:2,
40 short_length:6;
41#else
42#error "Please fix <asm/byteorder.h>"
43#endif
44 __be32 packet_number;
45 u8 secure_channel_id[8]; /* optional */
46} __packed;
47
48/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
49#define MIN_NON_SHORT_LEN 48
50
51#define GCM_AES_IV_LEN 12
52
53#define for_each_rxsc(secy, sc) \
54 for (sc = rcu_dereference_bh(secy->rx_sc); \
55 sc; \
56 sc = rcu_dereference_bh(sc->next))
57#define for_each_rxsc_rtnl(secy, sc) \
58 for (sc = rtnl_dereference(secy->rx_sc); \
59 sc; \
60 sc = rtnl_dereference(sc->next))
61
62#define pn_same_half(pn1, pn2) (!(((pn1) >> 31) ^ ((pn2) >> 31)))
63
64struct gcm_iv_xpn {
65 union {
66 u8 short_secure_channel_id[4];
67 ssci_t ssci;
68 };
69 __be64 pn;
70} __packed;
71
72struct gcm_iv {
73 union {
74 u8 secure_channel_id[8];
75 sci_t sci;
76 };
77 __be32 pn;
78};
79
80#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
81
82struct pcpu_secy_stats {
83 struct macsec_dev_stats stats;
84 struct u64_stats_sync syncp;
85};
86
87/**
88 * struct macsec_dev - private data
89 * @secy: SecY config
90 * @real_dev: pointer to underlying netdevice
91 * @dev_tracker: refcount tracker for @real_dev reference
92 * @stats: MACsec device stats
93 * @secys: linked list of SecY's on the underlying device
94 * @gro_cells: pointer to the Generic Receive Offload cell
95 * @offload: status of offloading on the MACsec device
96 */
97struct macsec_dev {
98 struct macsec_secy secy;
99 struct net_device *real_dev;
100 netdevice_tracker dev_tracker;
101 struct pcpu_secy_stats __percpu *stats;
102 struct list_head secys;
103 struct gro_cells gro_cells;
104 enum macsec_offload offload;
105};
106
107/**
108 * struct macsec_rxh_data - rx_handler private argument
109 * @secys: linked list of SecY's on this underlying device
110 */
111struct macsec_rxh_data {
112 struct list_head secys;
113};
114
115static struct macsec_dev *macsec_priv(const struct net_device *dev)
116{
117 return (struct macsec_dev *)netdev_priv(dev);
118}
119
120static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
121{
122 return rcu_dereference_bh(dev->rx_handler_data);
123}
124
125static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
126{
127 return rtnl_dereference(dev->rx_handler_data);
128}
129
130struct macsec_cb {
131 struct aead_request *req;
132 union {
133 struct macsec_tx_sa *tx_sa;
134 struct macsec_rx_sa *rx_sa;
135 };
136 u8 assoc_num;
137 bool valid;
138 bool has_sci;
139};
140
141static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
142{
143 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
144
145 if (!sa || !sa->active)
146 return NULL;
147
148 if (!refcount_inc_not_zero(&sa->refcnt))
149 return NULL;
150
151 return sa;
152}
153
154static struct macsec_rx_sa *macsec_active_rxsa_get(struct macsec_rx_sc *rx_sc)
155{
156 struct macsec_rx_sa *sa = NULL;
157 int an;
158
159 for (an = 0; an < MACSEC_NUM_AN; an++) {
160 sa = macsec_rxsa_get(rx_sc->sa[an]);
161 if (sa)
162 break;
163 }
164 return sa;
165}
166
167static void free_rx_sc_rcu(struct rcu_head *head)
168{
169 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
170
171 free_percpu(rx_sc->stats);
172 kfree(rx_sc);
173}
174
175static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
176{
177 return refcount_inc_not_zero(&sc->refcnt) ? sc : NULL;
178}
179
180static void macsec_rxsc_put(struct macsec_rx_sc *sc)
181{
182 if (refcount_dec_and_test(&sc->refcnt))
183 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
184}
185
186static void free_rxsa(struct rcu_head *head)
187{
188 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
189
190 crypto_free_aead(sa->key.tfm);
191 free_percpu(sa->stats);
192 kfree(sa);
193}
194
195static void macsec_rxsa_put(struct macsec_rx_sa *sa)
196{
197 if (refcount_dec_and_test(&sa->refcnt))
198 call_rcu(&sa->rcu, free_rxsa);
199}
200
201static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
202{
203 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
204
205 if (!sa || !sa->active)
206 return NULL;
207
208 if (!refcount_inc_not_zero(&sa->refcnt))
209 return NULL;
210
211 return sa;
212}
213
214static void free_txsa(struct rcu_head *head)
215{
216 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
217
218 crypto_free_aead(sa->key.tfm);
219 free_percpu(sa->stats);
220 kfree(sa);
221}
222
223static void macsec_txsa_put(struct macsec_tx_sa *sa)
224{
225 if (refcount_dec_and_test(&sa->refcnt))
226 call_rcu(&sa->rcu, free_txsa);
227}
228
229static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
230{
231 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
232 return (struct macsec_cb *)skb->cb;
233}
234
235#define MACSEC_PORT_SCB (0x0000)
236#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
237#define MACSEC_UNDEF_SSCI ((__force ssci_t)0xffffffff)
238
239#define MACSEC_GCM_AES_128_SAK_LEN 16
240#define MACSEC_GCM_AES_256_SAK_LEN 32
241
242#define DEFAULT_SAK_LEN MACSEC_GCM_AES_128_SAK_LEN
243#define DEFAULT_XPN false
244#define DEFAULT_SEND_SCI true
245#define DEFAULT_ENCRYPT false
246#define DEFAULT_ENCODING_SA 0
247#define MACSEC_XPN_MAX_REPLAY_WINDOW (((1 << 30) - 1))
248
249static sci_t make_sci(const u8 *addr, __be16 port)
250{
251 sci_t sci;
252
253 memcpy(&sci, addr, ETH_ALEN);
254 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
255
256 return sci;
257}
258
259static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
260{
261 sci_t sci;
262
263 if (sci_present)
264 memcpy(&sci, hdr->secure_channel_id,
265 sizeof(hdr->secure_channel_id));
266 else
267 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
268
269 return sci;
270}
271
272static unsigned int macsec_sectag_len(bool sci_present)
273{
274 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
275}
276
277static unsigned int macsec_hdr_len(bool sci_present)
278{
279 return macsec_sectag_len(sci_present) + ETH_HLEN;
280}
281
282static unsigned int macsec_extra_len(bool sci_present)
283{
284 return macsec_sectag_len(sci_present) + sizeof(__be16);
285}
286
287/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
288static void macsec_fill_sectag(struct macsec_eth_header *h,
289 const struct macsec_secy *secy, u32 pn,
290 bool sci_present)
291{
292 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
293
294 memset(&h->tci_an, 0, macsec_sectag_len(sci_present));
295 h->eth.h_proto = htons(ETH_P_MACSEC);
296
297 if (sci_present) {
298 h->tci_an |= MACSEC_TCI_SC;
299 memcpy(&h->secure_channel_id, &secy->sci,
300 sizeof(h->secure_channel_id));
301 } else {
302 if (tx_sc->end_station)
303 h->tci_an |= MACSEC_TCI_ES;
304 if (tx_sc->scb)
305 h->tci_an |= MACSEC_TCI_SCB;
306 }
307
308 h->packet_number = htonl(pn);
309
310 /* with GCM, C/E clear for !encrypt, both set for encrypt */
311 if (tx_sc->encrypt)
312 h->tci_an |= MACSEC_TCI_CONFID;
313 else if (secy->icv_len != MACSEC_DEFAULT_ICV_LEN)
314 h->tci_an |= MACSEC_TCI_C;
315
316 h->tci_an |= tx_sc->encoding_sa;
317}
318
319static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
320{
321 if (data_len < MIN_NON_SHORT_LEN)
322 h->short_length = data_len;
323}
324
325/* Checks if a MACsec interface is being offloaded to an hardware engine */
326static bool macsec_is_offloaded(struct macsec_dev *macsec)
327{
328 if (macsec->offload == MACSEC_OFFLOAD_MAC ||
329 macsec->offload == MACSEC_OFFLOAD_PHY)
330 return true;
331
332 return false;
333}
334
335/* Checks if underlying layers implement MACsec offloading functions. */
336static bool macsec_check_offload(enum macsec_offload offload,
337 struct macsec_dev *macsec)
338{
339 if (!macsec || !macsec->real_dev)
340 return false;
341
342 if (offload == MACSEC_OFFLOAD_PHY)
343 return macsec->real_dev->phydev &&
344 macsec->real_dev->phydev->macsec_ops;
345 else if (offload == MACSEC_OFFLOAD_MAC)
346 return macsec->real_dev->features & NETIF_F_HW_MACSEC &&
347 macsec->real_dev->macsec_ops;
348
349 return false;
350}
351
352static const struct macsec_ops *__macsec_get_ops(enum macsec_offload offload,
353 struct macsec_dev *macsec,
354 struct macsec_context *ctx)
355{
356 if (ctx) {
357 memset(ctx, 0, sizeof(*ctx));
358 ctx->offload = offload;
359
360 if (offload == MACSEC_OFFLOAD_PHY)
361 ctx->phydev = macsec->real_dev->phydev;
362 else if (offload == MACSEC_OFFLOAD_MAC)
363 ctx->netdev = macsec->real_dev;
364 }
365
366 if (offload == MACSEC_OFFLOAD_PHY)
367 return macsec->real_dev->phydev->macsec_ops;
368 else
369 return macsec->real_dev->macsec_ops;
370}
371
372/* Returns a pointer to the MACsec ops struct if any and updates the MACsec
373 * context device reference if provided.
374 */
375static const struct macsec_ops *macsec_get_ops(struct macsec_dev *macsec,
376 struct macsec_context *ctx)
377{
378 if (!macsec_check_offload(macsec->offload, macsec))
379 return NULL;
380
381 return __macsec_get_ops(macsec->offload, macsec, ctx);
382}
383
384/* validate MACsec packet according to IEEE 802.1AE-2018 9.12 */
385static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len, bool xpn)
386{
387 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
388 int len = skb->len - 2 * ETH_ALEN;
389 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
390
391 /* a) It comprises at least 17 octets */
392 if (skb->len <= 16)
393 return false;
394
395 /* b) MACsec EtherType: already checked */
396
397 /* c) V bit is clear */
398 if (h->tci_an & MACSEC_TCI_VERSION)
399 return false;
400
401 /* d) ES or SCB => !SC */
402 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
403 (h->tci_an & MACSEC_TCI_SC))
404 return false;
405
406 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
407 if (h->unused)
408 return false;
409
410 /* rx.pn != 0 if not XPN (figure 10-5 with 802.11AEbw-2013 amendment) */
411 if (!h->packet_number && !xpn)
412 return false;
413
414 /* length check, f) g) h) i) */
415 if (h->short_length)
416 return len == extra_len + h->short_length;
417 return len >= extra_len + MIN_NON_SHORT_LEN;
418}
419
420#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
421#define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN
422
423static void macsec_fill_iv_xpn(unsigned char *iv, ssci_t ssci, u64 pn,
424 salt_t salt)
425{
426 struct gcm_iv_xpn *gcm_iv = (struct gcm_iv_xpn *)iv;
427
428 gcm_iv->ssci = ssci ^ salt.ssci;
429 gcm_iv->pn = cpu_to_be64(pn) ^ salt.pn;
430}
431
432static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
433{
434 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
435
436 gcm_iv->sci = sci;
437 gcm_iv->pn = htonl(pn);
438}
439
440static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
441{
442 return (struct macsec_eth_header *)skb_mac_header(skb);
443}
444
445static void __macsec_pn_wrapped(struct macsec_secy *secy,
446 struct macsec_tx_sa *tx_sa)
447{
448 pr_debug("PN wrapped, transitioning to !oper\n");
449 tx_sa->active = false;
450 if (secy->protect_frames)
451 secy->operational = false;
452}
453
454void macsec_pn_wrapped(struct macsec_secy *secy, struct macsec_tx_sa *tx_sa)
455{
456 spin_lock_bh(&tx_sa->lock);
457 __macsec_pn_wrapped(secy, tx_sa);
458 spin_unlock_bh(&tx_sa->lock);
459}
460EXPORT_SYMBOL_GPL(macsec_pn_wrapped);
461
462static pn_t tx_sa_update_pn(struct macsec_tx_sa *tx_sa,
463 struct macsec_secy *secy)
464{
465 pn_t pn;
466
467 spin_lock_bh(&tx_sa->lock);
468
469 pn = tx_sa->next_pn_halves;
470 if (secy->xpn)
471 tx_sa->next_pn++;
472 else
473 tx_sa->next_pn_halves.lower++;
474
475 if (tx_sa->next_pn == 0)
476 __macsec_pn_wrapped(secy, tx_sa);
477 spin_unlock_bh(&tx_sa->lock);
478
479 return pn;
480}
481
482static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
483{
484 struct macsec_dev *macsec = netdev_priv(dev);
485
486 skb->dev = macsec->real_dev;
487 skb_reset_mac_header(skb);
488 skb->protocol = eth_hdr(skb)->h_proto;
489}
490
491static unsigned int macsec_msdu_len(struct sk_buff *skb)
492{
493 struct macsec_dev *macsec = macsec_priv(skb->dev);
494 struct macsec_secy *secy = &macsec->secy;
495 bool sci_present = macsec_skb_cb(skb)->has_sci;
496
497 return skb->len - macsec_hdr_len(sci_present) - secy->icv_len;
498}
499
500static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
501 struct macsec_tx_sa *tx_sa)
502{
503 unsigned int msdu_len = macsec_msdu_len(skb);
504 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
505
506 u64_stats_update_begin(&txsc_stats->syncp);
507 if (tx_sc->encrypt) {
508 txsc_stats->stats.OutOctetsEncrypted += msdu_len;
509 txsc_stats->stats.OutPktsEncrypted++;
510 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
511 } else {
512 txsc_stats->stats.OutOctetsProtected += msdu_len;
513 txsc_stats->stats.OutPktsProtected++;
514 this_cpu_inc(tx_sa->stats->OutPktsProtected);
515 }
516 u64_stats_update_end(&txsc_stats->syncp);
517}
518
519static void count_tx(struct net_device *dev, int ret, int len)
520{
521 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
522 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
523
524 u64_stats_update_begin(&stats->syncp);
525 u64_stats_inc(&stats->tx_packets);
526 u64_stats_add(&stats->tx_bytes, len);
527 u64_stats_update_end(&stats->syncp);
528 }
529}
530
531static void macsec_encrypt_done(struct crypto_async_request *base, int err)
532{
533 struct sk_buff *skb = base->data;
534 struct net_device *dev = skb->dev;
535 struct macsec_dev *macsec = macsec_priv(dev);
536 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
537 int len, ret;
538
539 aead_request_free(macsec_skb_cb(skb)->req);
540
541 rcu_read_lock_bh();
542 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
543 /* packet is encrypted/protected so tx_bytes must be calculated */
544 len = macsec_msdu_len(skb) + 2 * ETH_ALEN;
545 macsec_encrypt_finish(skb, dev);
546 ret = dev_queue_xmit(skb);
547 count_tx(dev, ret, len);
548 rcu_read_unlock_bh();
549
550 macsec_txsa_put(sa);
551 dev_put(dev);
552}
553
554static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm,
555 unsigned char **iv,
556 struct scatterlist **sg,
557 int num_frags)
558{
559 size_t size, iv_offset, sg_offset;
560 struct aead_request *req;
561 void *tmp;
562
563 size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm);
564 iv_offset = size;
565 size += GCM_AES_IV_LEN;
566
567 size = ALIGN(size, __alignof__(struct scatterlist));
568 sg_offset = size;
569 size += sizeof(struct scatterlist) * num_frags;
570
571 tmp = kmalloc(size, GFP_ATOMIC);
572 if (!tmp)
573 return NULL;
574
575 *iv = (unsigned char *)(tmp + iv_offset);
576 *sg = (struct scatterlist *)(tmp + sg_offset);
577 req = tmp;
578
579 aead_request_set_tfm(req, tfm);
580
581 return req;
582}
583
584static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
585 struct net_device *dev)
586{
587 int ret;
588 struct scatterlist *sg;
589 struct sk_buff *trailer;
590 unsigned char *iv;
591 struct ethhdr *eth;
592 struct macsec_eth_header *hh;
593 size_t unprotected_len;
594 struct aead_request *req;
595 struct macsec_secy *secy;
596 struct macsec_tx_sc *tx_sc;
597 struct macsec_tx_sa *tx_sa;
598 struct macsec_dev *macsec = macsec_priv(dev);
599 bool sci_present;
600 pn_t pn;
601
602 secy = &macsec->secy;
603 tx_sc = &secy->tx_sc;
604
605 /* 10.5.1 TX SA assignment */
606 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
607 if (!tx_sa) {
608 secy->operational = false;
609 kfree_skb(skb);
610 return ERR_PTR(-EINVAL);
611 }
612
613 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
614 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
615 struct sk_buff *nskb = skb_copy_expand(skb,
616 MACSEC_NEEDED_HEADROOM,
617 MACSEC_NEEDED_TAILROOM,
618 GFP_ATOMIC);
619 if (likely(nskb)) {
620 consume_skb(skb);
621 skb = nskb;
622 } else {
623 macsec_txsa_put(tx_sa);
624 kfree_skb(skb);
625 return ERR_PTR(-ENOMEM);
626 }
627 } else {
628 skb = skb_unshare(skb, GFP_ATOMIC);
629 if (!skb) {
630 macsec_txsa_put(tx_sa);
631 return ERR_PTR(-ENOMEM);
632 }
633 }
634
635 unprotected_len = skb->len;
636 eth = eth_hdr(skb);
637 sci_present = macsec_send_sci(secy);
638 hh = skb_push(skb, macsec_extra_len(sci_present));
639 memmove(hh, eth, 2 * ETH_ALEN);
640
641 pn = tx_sa_update_pn(tx_sa, secy);
642 if (pn.full64 == 0) {
643 macsec_txsa_put(tx_sa);
644 kfree_skb(skb);
645 return ERR_PTR(-ENOLINK);
646 }
647 macsec_fill_sectag(hh, secy, pn.lower, sci_present);
648 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
649
650 skb_put(skb, secy->icv_len);
651
652 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
653 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
654
655 u64_stats_update_begin(&secy_stats->syncp);
656 secy_stats->stats.OutPktsTooLong++;
657 u64_stats_update_end(&secy_stats->syncp);
658
659 macsec_txsa_put(tx_sa);
660 kfree_skb(skb);
661 return ERR_PTR(-EINVAL);
662 }
663
664 ret = skb_cow_data(skb, 0, &trailer);
665 if (unlikely(ret < 0)) {
666 macsec_txsa_put(tx_sa);
667 kfree_skb(skb);
668 return ERR_PTR(ret);
669 }
670
671 req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg, ret);
672 if (!req) {
673 macsec_txsa_put(tx_sa);
674 kfree_skb(skb);
675 return ERR_PTR(-ENOMEM);
676 }
677
678 if (secy->xpn)
679 macsec_fill_iv_xpn(iv, tx_sa->ssci, pn.full64, tx_sa->key.salt);
680 else
681 macsec_fill_iv(iv, secy->sci, pn.lower);
682
683 sg_init_table(sg, ret);
684 ret = skb_to_sgvec(skb, sg, 0, skb->len);
685 if (unlikely(ret < 0)) {
686 aead_request_free(req);
687 macsec_txsa_put(tx_sa);
688 kfree_skb(skb);
689 return ERR_PTR(ret);
690 }
691
692 if (tx_sc->encrypt) {
693 int len = skb->len - macsec_hdr_len(sci_present) -
694 secy->icv_len;
695 aead_request_set_crypt(req, sg, sg, len, iv);
696 aead_request_set_ad(req, macsec_hdr_len(sci_present));
697 } else {
698 aead_request_set_crypt(req, sg, sg, 0, iv);
699 aead_request_set_ad(req, skb->len - secy->icv_len);
700 }
701
702 macsec_skb_cb(skb)->req = req;
703 macsec_skb_cb(skb)->tx_sa = tx_sa;
704 macsec_skb_cb(skb)->has_sci = sci_present;
705 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
706
707 dev_hold(skb->dev);
708 ret = crypto_aead_encrypt(req);
709 if (ret == -EINPROGRESS) {
710 return ERR_PTR(ret);
711 } else if (ret != 0) {
712 dev_put(skb->dev);
713 kfree_skb(skb);
714 aead_request_free(req);
715 macsec_txsa_put(tx_sa);
716 return ERR_PTR(-EINVAL);
717 }
718
719 dev_put(skb->dev);
720 aead_request_free(req);
721 macsec_txsa_put(tx_sa);
722
723 return skb;
724}
725
726static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
727{
728 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
729 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
730 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
731 u32 lowest_pn = 0;
732
733 spin_lock(&rx_sa->lock);
734 if (rx_sa->next_pn_halves.lower >= secy->replay_window)
735 lowest_pn = rx_sa->next_pn_halves.lower - secy->replay_window;
736
737 /* Now perform replay protection check again
738 * (see IEEE 802.1AE-2006 figure 10-5)
739 */
740 if (secy->replay_protect && pn < lowest_pn &&
741 (!secy->xpn || pn_same_half(pn, lowest_pn))) {
742 spin_unlock(&rx_sa->lock);
743 u64_stats_update_begin(&rxsc_stats->syncp);
744 rxsc_stats->stats.InPktsLate++;
745 u64_stats_update_end(&rxsc_stats->syncp);
746 secy->netdev->stats.rx_dropped++;
747 return false;
748 }
749
750 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
751 unsigned int msdu_len = macsec_msdu_len(skb);
752 u64_stats_update_begin(&rxsc_stats->syncp);
753 if (hdr->tci_an & MACSEC_TCI_E)
754 rxsc_stats->stats.InOctetsDecrypted += msdu_len;
755 else
756 rxsc_stats->stats.InOctetsValidated += msdu_len;
757 u64_stats_update_end(&rxsc_stats->syncp);
758 }
759
760 if (!macsec_skb_cb(skb)->valid) {
761 spin_unlock(&rx_sa->lock);
762
763 /* 10.6.5 */
764 if (hdr->tci_an & MACSEC_TCI_C ||
765 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
766 u64_stats_update_begin(&rxsc_stats->syncp);
767 rxsc_stats->stats.InPktsNotValid++;
768 u64_stats_update_end(&rxsc_stats->syncp);
769 this_cpu_inc(rx_sa->stats->InPktsNotValid);
770 secy->netdev->stats.rx_errors++;
771 return false;
772 }
773
774 u64_stats_update_begin(&rxsc_stats->syncp);
775 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
776 rxsc_stats->stats.InPktsInvalid++;
777 this_cpu_inc(rx_sa->stats->InPktsInvalid);
778 } else if (pn < lowest_pn) {
779 rxsc_stats->stats.InPktsDelayed++;
780 } else {
781 rxsc_stats->stats.InPktsUnchecked++;
782 }
783 u64_stats_update_end(&rxsc_stats->syncp);
784 } else {
785 u64_stats_update_begin(&rxsc_stats->syncp);
786 if (pn < lowest_pn) {
787 rxsc_stats->stats.InPktsDelayed++;
788 } else {
789 rxsc_stats->stats.InPktsOK++;
790 this_cpu_inc(rx_sa->stats->InPktsOK);
791 }
792 u64_stats_update_end(&rxsc_stats->syncp);
793
794 // Instead of "pn >=" - to support pn overflow in xpn
795 if (pn + 1 > rx_sa->next_pn_halves.lower) {
796 rx_sa->next_pn_halves.lower = pn + 1;
797 } else if (secy->xpn &&
798 !pn_same_half(pn, rx_sa->next_pn_halves.lower)) {
799 rx_sa->next_pn_halves.upper++;
800 rx_sa->next_pn_halves.lower = pn + 1;
801 }
802
803 spin_unlock(&rx_sa->lock);
804 }
805
806 return true;
807}
808
809static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
810{
811 skb->pkt_type = PACKET_HOST;
812 skb->protocol = eth_type_trans(skb, dev);
813
814 skb_reset_network_header(skb);
815 if (!skb_transport_header_was_set(skb))
816 skb_reset_transport_header(skb);
817 skb_reset_mac_len(skb);
818}
819
820static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
821{
822 skb->ip_summed = CHECKSUM_NONE;
823 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
824 skb_pull(skb, hdr_len);
825 pskb_trim_unique(skb, skb->len - icv_len);
826}
827
828static void count_rx(struct net_device *dev, int len)
829{
830 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
831
832 u64_stats_update_begin(&stats->syncp);
833 u64_stats_inc(&stats->rx_packets);
834 u64_stats_add(&stats->rx_bytes, len);
835 u64_stats_update_end(&stats->syncp);
836}
837
838static void macsec_decrypt_done(struct crypto_async_request *base, int err)
839{
840 struct sk_buff *skb = base->data;
841 struct net_device *dev = skb->dev;
842 struct macsec_dev *macsec = macsec_priv(dev);
843 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
844 struct macsec_rx_sc *rx_sc = rx_sa->sc;
845 int len;
846 u32 pn;
847
848 aead_request_free(macsec_skb_cb(skb)->req);
849
850 if (!err)
851 macsec_skb_cb(skb)->valid = true;
852
853 rcu_read_lock_bh();
854 pn = ntohl(macsec_ethhdr(skb)->packet_number);
855 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
856 rcu_read_unlock_bh();
857 kfree_skb(skb);
858 goto out;
859 }
860
861 macsec_finalize_skb(skb, macsec->secy.icv_len,
862 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
863 len = skb->len;
864 macsec_reset_skb(skb, macsec->secy.netdev);
865
866 if (gro_cells_receive(&macsec->gro_cells, skb) == NET_RX_SUCCESS)
867 count_rx(dev, len);
868
869 rcu_read_unlock_bh();
870
871out:
872 macsec_rxsa_put(rx_sa);
873 macsec_rxsc_put(rx_sc);
874 dev_put(dev);
875}
876
877static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
878 struct net_device *dev,
879 struct macsec_rx_sa *rx_sa,
880 sci_t sci,
881 struct macsec_secy *secy)
882{
883 int ret;
884 struct scatterlist *sg;
885 struct sk_buff *trailer;
886 unsigned char *iv;
887 struct aead_request *req;
888 struct macsec_eth_header *hdr;
889 u32 hdr_pn;
890 u16 icv_len = secy->icv_len;
891
892 macsec_skb_cb(skb)->valid = false;
893 skb = skb_share_check(skb, GFP_ATOMIC);
894 if (!skb)
895 return ERR_PTR(-ENOMEM);
896
897 ret = skb_cow_data(skb, 0, &trailer);
898 if (unlikely(ret < 0)) {
899 kfree_skb(skb);
900 return ERR_PTR(ret);
901 }
902 req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg, ret);
903 if (!req) {
904 kfree_skb(skb);
905 return ERR_PTR(-ENOMEM);
906 }
907
908 hdr = (struct macsec_eth_header *)skb->data;
909 hdr_pn = ntohl(hdr->packet_number);
910
911 if (secy->xpn) {
912 pn_t recovered_pn = rx_sa->next_pn_halves;
913
914 recovered_pn.lower = hdr_pn;
915 if (hdr_pn < rx_sa->next_pn_halves.lower &&
916 !pn_same_half(hdr_pn, rx_sa->next_pn_halves.lower))
917 recovered_pn.upper++;
918
919 macsec_fill_iv_xpn(iv, rx_sa->ssci, recovered_pn.full64,
920 rx_sa->key.salt);
921 } else {
922 macsec_fill_iv(iv, sci, hdr_pn);
923 }
924
925 sg_init_table(sg, ret);
926 ret = skb_to_sgvec(skb, sg, 0, skb->len);
927 if (unlikely(ret < 0)) {
928 aead_request_free(req);
929 kfree_skb(skb);
930 return ERR_PTR(ret);
931 }
932
933 if (hdr->tci_an & MACSEC_TCI_E) {
934 /* confidentiality: ethernet + macsec header
935 * authenticated, encrypted payload
936 */
937 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
938
939 aead_request_set_crypt(req, sg, sg, len, iv);
940 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
941 skb = skb_unshare(skb, GFP_ATOMIC);
942 if (!skb) {
943 aead_request_free(req);
944 return ERR_PTR(-ENOMEM);
945 }
946 } else {
947 /* integrity only: all headers + data authenticated */
948 aead_request_set_crypt(req, sg, sg, icv_len, iv);
949 aead_request_set_ad(req, skb->len - icv_len);
950 }
951
952 macsec_skb_cb(skb)->req = req;
953 skb->dev = dev;
954 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
955
956 dev_hold(dev);
957 ret = crypto_aead_decrypt(req);
958 if (ret == -EINPROGRESS) {
959 return ERR_PTR(ret);
960 } else if (ret != 0) {
961 /* decryption/authentication failed
962 * 10.6 if validateFrames is disabled, deliver anyway
963 */
964 if (ret != -EBADMSG) {
965 kfree_skb(skb);
966 skb = ERR_PTR(ret);
967 }
968 } else {
969 macsec_skb_cb(skb)->valid = true;
970 }
971 dev_put(dev);
972
973 aead_request_free(req);
974
975 return skb;
976}
977
978static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
979{
980 struct macsec_rx_sc *rx_sc;
981
982 for_each_rxsc(secy, rx_sc) {
983 if (rx_sc->sci == sci)
984 return rx_sc;
985 }
986
987 return NULL;
988}
989
990static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
991{
992 struct macsec_rx_sc *rx_sc;
993
994 for_each_rxsc_rtnl(secy, rx_sc) {
995 if (rx_sc->sci == sci)
996 return rx_sc;
997 }
998
999 return NULL;
1000}
1001
1002static enum rx_handler_result handle_not_macsec(struct sk_buff *skb)
1003{
1004 /* Deliver to the uncontrolled port by default */
1005 enum rx_handler_result ret = RX_HANDLER_PASS;
1006 struct ethhdr *hdr = eth_hdr(skb);
1007 struct metadata_dst *md_dst;
1008 struct macsec_rxh_data *rxd;
1009 struct macsec_dev *macsec;
1010
1011 rcu_read_lock();
1012 rxd = macsec_data_rcu(skb->dev);
1013 md_dst = skb_metadata_dst(skb);
1014
1015 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1016 struct sk_buff *nskb;
1017 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
1018 struct net_device *ndev = macsec->secy.netdev;
1019
1020 /* If h/w offloading is enabled, HW decodes frames and strips
1021 * the SecTAG, so we have to deduce which port to deliver to.
1022 */
1023 if (macsec_is_offloaded(macsec) && netif_running(ndev)) {
1024 if (md_dst && md_dst->type == METADATA_MACSEC &&
1025 (!find_rx_sc(&macsec->secy, md_dst->u.macsec_info.sci)))
1026 continue;
1027
1028 if (ether_addr_equal_64bits(hdr->h_dest,
1029 ndev->dev_addr)) {
1030 /* exact match, divert skb to this port */
1031 skb->dev = ndev;
1032 skb->pkt_type = PACKET_HOST;
1033 ret = RX_HANDLER_ANOTHER;
1034 goto out;
1035 } else if (is_multicast_ether_addr_64bits(
1036 hdr->h_dest)) {
1037 /* multicast frame, deliver on this port too */
1038 nskb = skb_clone(skb, GFP_ATOMIC);
1039 if (!nskb)
1040 break;
1041
1042 nskb->dev = ndev;
1043 if (ether_addr_equal_64bits(hdr->h_dest,
1044 ndev->broadcast))
1045 nskb->pkt_type = PACKET_BROADCAST;
1046 else
1047 nskb->pkt_type = PACKET_MULTICAST;
1048
1049 __netif_rx(nskb);
1050 }
1051 continue;
1052 }
1053
1054 /* 10.6 If the management control validateFrames is not
1055 * Strict, frames without a SecTAG are received, counted, and
1056 * delivered to the Controlled Port
1057 */
1058 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1059 u64_stats_update_begin(&secy_stats->syncp);
1060 secy_stats->stats.InPktsNoTag++;
1061 u64_stats_update_end(&secy_stats->syncp);
1062 macsec->secy.netdev->stats.rx_dropped++;
1063 continue;
1064 }
1065
1066 /* deliver on this port */
1067 nskb = skb_clone(skb, GFP_ATOMIC);
1068 if (!nskb)
1069 break;
1070
1071 nskb->dev = ndev;
1072
1073 if (__netif_rx(nskb) == NET_RX_SUCCESS) {
1074 u64_stats_update_begin(&secy_stats->syncp);
1075 secy_stats->stats.InPktsUntagged++;
1076 u64_stats_update_end(&secy_stats->syncp);
1077 }
1078 }
1079
1080out:
1081 rcu_read_unlock();
1082 return ret;
1083}
1084
1085static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1086{
1087 struct sk_buff *skb = *pskb;
1088 struct net_device *dev = skb->dev;
1089 struct macsec_eth_header *hdr;
1090 struct macsec_secy *secy = NULL;
1091 struct macsec_rx_sc *rx_sc;
1092 struct macsec_rx_sa *rx_sa;
1093 struct macsec_rxh_data *rxd;
1094 struct macsec_dev *macsec;
1095 unsigned int len;
1096 sci_t sci;
1097 u32 hdr_pn;
1098 bool cbit;
1099 struct pcpu_rx_sc_stats *rxsc_stats;
1100 struct pcpu_secy_stats *secy_stats;
1101 bool pulled_sci;
1102 int ret;
1103
1104 if (skb_headroom(skb) < ETH_HLEN)
1105 goto drop_direct;
1106
1107 hdr = macsec_ethhdr(skb);
1108 if (hdr->eth.h_proto != htons(ETH_P_MACSEC))
1109 return handle_not_macsec(skb);
1110
1111 skb = skb_unshare(skb, GFP_ATOMIC);
1112 *pskb = skb;
1113 if (!skb)
1114 return RX_HANDLER_CONSUMED;
1115
1116 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1117 if (!pulled_sci) {
1118 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1119 goto drop_direct;
1120 }
1121
1122 hdr = macsec_ethhdr(skb);
1123
1124 /* Frames with a SecTAG that has the TCI E bit set but the C
1125 * bit clear are discarded, as this reserved encoding is used
1126 * to identify frames with a SecTAG that are not to be
1127 * delivered to the Controlled Port.
1128 */
1129 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1130 return RX_HANDLER_PASS;
1131
1132 /* now, pull the extra length */
1133 if (hdr->tci_an & MACSEC_TCI_SC) {
1134 if (!pulled_sci)
1135 goto drop_direct;
1136 }
1137
1138 /* ethernet header is part of crypto processing */
1139 skb_push(skb, ETH_HLEN);
1140
1141 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1142 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1143 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1144
1145 rcu_read_lock();
1146 rxd = macsec_data_rcu(skb->dev);
1147
1148 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1149 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1150
1151 sc = sc ? macsec_rxsc_get(sc) : NULL;
1152
1153 if (sc) {
1154 secy = &macsec->secy;
1155 rx_sc = sc;
1156 break;
1157 }
1158 }
1159
1160 if (!secy)
1161 goto nosci;
1162
1163 dev = secy->netdev;
1164 macsec = macsec_priv(dev);
1165 secy_stats = this_cpu_ptr(macsec->stats);
1166 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1167
1168 if (!macsec_validate_skb(skb, secy->icv_len, secy->xpn)) {
1169 u64_stats_update_begin(&secy_stats->syncp);
1170 secy_stats->stats.InPktsBadTag++;
1171 u64_stats_update_end(&secy_stats->syncp);
1172 secy->netdev->stats.rx_errors++;
1173 goto drop_nosa;
1174 }
1175
1176 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1177 if (!rx_sa) {
1178 /* 10.6.1 if the SA is not in use */
1179
1180 /* If validateFrames is Strict or the C bit in the
1181 * SecTAG is set, discard
1182 */
1183 struct macsec_rx_sa *active_rx_sa = macsec_active_rxsa_get(rx_sc);
1184 if (hdr->tci_an & MACSEC_TCI_C ||
1185 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1186 u64_stats_update_begin(&rxsc_stats->syncp);
1187 rxsc_stats->stats.InPktsNotUsingSA++;
1188 u64_stats_update_end(&rxsc_stats->syncp);
1189 secy->netdev->stats.rx_errors++;
1190 if (active_rx_sa)
1191 this_cpu_inc(active_rx_sa->stats->InPktsNotUsingSA);
1192 goto drop_nosa;
1193 }
1194
1195 /* not Strict, the frame (with the SecTAG and ICV
1196 * removed) is delivered to the Controlled Port.
1197 */
1198 u64_stats_update_begin(&rxsc_stats->syncp);
1199 rxsc_stats->stats.InPktsUnusedSA++;
1200 u64_stats_update_end(&rxsc_stats->syncp);
1201 if (active_rx_sa)
1202 this_cpu_inc(active_rx_sa->stats->InPktsUnusedSA);
1203 goto deliver;
1204 }
1205
1206 /* First, PN check to avoid decrypting obviously wrong packets */
1207 hdr_pn = ntohl(hdr->packet_number);
1208 if (secy->replay_protect) {
1209 bool late;
1210
1211 spin_lock(&rx_sa->lock);
1212 late = rx_sa->next_pn_halves.lower >= secy->replay_window &&
1213 hdr_pn < (rx_sa->next_pn_halves.lower - secy->replay_window);
1214
1215 if (secy->xpn)
1216 late = late && pn_same_half(rx_sa->next_pn_halves.lower, hdr_pn);
1217 spin_unlock(&rx_sa->lock);
1218
1219 if (late) {
1220 u64_stats_update_begin(&rxsc_stats->syncp);
1221 rxsc_stats->stats.InPktsLate++;
1222 u64_stats_update_end(&rxsc_stats->syncp);
1223 macsec->secy.netdev->stats.rx_dropped++;
1224 goto drop;
1225 }
1226 }
1227
1228 macsec_skb_cb(skb)->rx_sa = rx_sa;
1229
1230 /* Disabled && !changed text => skip validation */
1231 if (hdr->tci_an & MACSEC_TCI_C ||
1232 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1233 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1234
1235 if (IS_ERR(skb)) {
1236 /* the decrypt callback needs the reference */
1237 if (PTR_ERR(skb) != -EINPROGRESS) {
1238 macsec_rxsa_put(rx_sa);
1239 macsec_rxsc_put(rx_sc);
1240 }
1241 rcu_read_unlock();
1242 *pskb = NULL;
1243 return RX_HANDLER_CONSUMED;
1244 }
1245
1246 if (!macsec_post_decrypt(skb, secy, hdr_pn))
1247 goto drop;
1248
1249deliver:
1250 macsec_finalize_skb(skb, secy->icv_len,
1251 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1252 len = skb->len;
1253 macsec_reset_skb(skb, secy->netdev);
1254
1255 if (rx_sa)
1256 macsec_rxsa_put(rx_sa);
1257 macsec_rxsc_put(rx_sc);
1258
1259 skb_orphan(skb);
1260 ret = gro_cells_receive(&macsec->gro_cells, skb);
1261 if (ret == NET_RX_SUCCESS)
1262 count_rx(dev, len);
1263 else
1264 macsec->secy.netdev->stats.rx_dropped++;
1265
1266 rcu_read_unlock();
1267
1268 *pskb = NULL;
1269 return RX_HANDLER_CONSUMED;
1270
1271drop:
1272 macsec_rxsa_put(rx_sa);
1273drop_nosa:
1274 macsec_rxsc_put(rx_sc);
1275 rcu_read_unlock();
1276drop_direct:
1277 kfree_skb(skb);
1278 *pskb = NULL;
1279 return RX_HANDLER_CONSUMED;
1280
1281nosci:
1282 /* 10.6.1 if the SC is not found */
1283 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1284 if (!cbit)
1285 macsec_finalize_skb(skb, MACSEC_DEFAULT_ICV_LEN,
1286 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1287
1288 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1289 struct sk_buff *nskb;
1290
1291 secy_stats = this_cpu_ptr(macsec->stats);
1292
1293 /* If validateFrames is Strict or the C bit in the
1294 * SecTAG is set, discard
1295 */
1296 if (cbit ||
1297 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1298 u64_stats_update_begin(&secy_stats->syncp);
1299 secy_stats->stats.InPktsNoSCI++;
1300 u64_stats_update_end(&secy_stats->syncp);
1301 macsec->secy.netdev->stats.rx_errors++;
1302 continue;
1303 }
1304
1305 /* not strict, the frame (with the SecTAG and ICV
1306 * removed) is delivered to the Controlled Port.
1307 */
1308 nskb = skb_clone(skb, GFP_ATOMIC);
1309 if (!nskb)
1310 break;
1311
1312 macsec_reset_skb(nskb, macsec->secy.netdev);
1313
1314 ret = __netif_rx(nskb);
1315 if (ret == NET_RX_SUCCESS) {
1316 u64_stats_update_begin(&secy_stats->syncp);
1317 secy_stats->stats.InPktsUnknownSCI++;
1318 u64_stats_update_end(&secy_stats->syncp);
1319 } else {
1320 macsec->secy.netdev->stats.rx_dropped++;
1321 }
1322 }
1323
1324 rcu_read_unlock();
1325 *pskb = skb;
1326 return RX_HANDLER_PASS;
1327}
1328
1329static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1330{
1331 struct crypto_aead *tfm;
1332 int ret;
1333
1334 /* Pick a sync gcm(aes) cipher to ensure order is preserved. */
1335 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1336
1337 if (IS_ERR(tfm))
1338 return tfm;
1339
1340 ret = crypto_aead_setkey(tfm, key, key_len);
1341 if (ret < 0)
1342 goto fail;
1343
1344 ret = crypto_aead_setauthsize(tfm, icv_len);
1345 if (ret < 0)
1346 goto fail;
1347
1348 return tfm;
1349fail:
1350 crypto_free_aead(tfm);
1351 return ERR_PTR(ret);
1352}
1353
1354static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1355 int icv_len)
1356{
1357 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1358 if (!rx_sa->stats)
1359 return -ENOMEM;
1360
1361 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1362 if (IS_ERR(rx_sa->key.tfm)) {
1363 free_percpu(rx_sa->stats);
1364 return PTR_ERR(rx_sa->key.tfm);
1365 }
1366
1367 rx_sa->ssci = MACSEC_UNDEF_SSCI;
1368 rx_sa->active = false;
1369 rx_sa->next_pn = 1;
1370 refcount_set(&rx_sa->refcnt, 1);
1371 spin_lock_init(&rx_sa->lock);
1372
1373 return 0;
1374}
1375
1376static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1377{
1378 rx_sa->active = false;
1379
1380 macsec_rxsa_put(rx_sa);
1381}
1382
1383static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1384{
1385 int i;
1386
1387 for (i = 0; i < MACSEC_NUM_AN; i++) {
1388 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1389
1390 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1391 if (sa)
1392 clear_rx_sa(sa);
1393 }
1394
1395 macsec_rxsc_put(rx_sc);
1396}
1397
1398static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1399{
1400 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1401
1402 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1403 rx_sc;
1404 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1405 if (rx_sc->sci == sci) {
1406 if (rx_sc->active)
1407 secy->n_rx_sc--;
1408 rcu_assign_pointer(*rx_scp, rx_sc->next);
1409 return rx_sc;
1410 }
1411 }
1412
1413 return NULL;
1414}
1415
1416static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci,
1417 bool active)
1418{
1419 struct macsec_rx_sc *rx_sc;
1420 struct macsec_dev *macsec;
1421 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1422 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1423 struct macsec_secy *secy;
1424
1425 list_for_each_entry(macsec, &rxd->secys, secys) {
1426 if (find_rx_sc_rtnl(&macsec->secy, sci))
1427 return ERR_PTR(-EEXIST);
1428 }
1429
1430 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1431 if (!rx_sc)
1432 return ERR_PTR(-ENOMEM);
1433
1434 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1435 if (!rx_sc->stats) {
1436 kfree(rx_sc);
1437 return ERR_PTR(-ENOMEM);
1438 }
1439
1440 rx_sc->sci = sci;
1441 rx_sc->active = active;
1442 refcount_set(&rx_sc->refcnt, 1);
1443
1444 secy = &macsec_priv(dev)->secy;
1445 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1446 rcu_assign_pointer(secy->rx_sc, rx_sc);
1447
1448 if (rx_sc->active)
1449 secy->n_rx_sc++;
1450
1451 return rx_sc;
1452}
1453
1454static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1455 int icv_len)
1456{
1457 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1458 if (!tx_sa->stats)
1459 return -ENOMEM;
1460
1461 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1462 if (IS_ERR(tx_sa->key.tfm)) {
1463 free_percpu(tx_sa->stats);
1464 return PTR_ERR(tx_sa->key.tfm);
1465 }
1466
1467 tx_sa->ssci = MACSEC_UNDEF_SSCI;
1468 tx_sa->active = false;
1469 refcount_set(&tx_sa->refcnt, 1);
1470 spin_lock_init(&tx_sa->lock);
1471
1472 return 0;
1473}
1474
1475static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1476{
1477 tx_sa->active = false;
1478
1479 macsec_txsa_put(tx_sa);
1480}
1481
1482static struct genl_family macsec_fam;
1483
1484static struct net_device *get_dev_from_nl(struct net *net,
1485 struct nlattr **attrs)
1486{
1487 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1488 struct net_device *dev;
1489
1490 dev = __dev_get_by_index(net, ifindex);
1491 if (!dev)
1492 return ERR_PTR(-ENODEV);
1493
1494 if (!netif_is_macsec(dev))
1495 return ERR_PTR(-ENODEV);
1496
1497 return dev;
1498}
1499
1500static enum macsec_offload nla_get_offload(const struct nlattr *nla)
1501{
1502 return (__force enum macsec_offload)nla_get_u8(nla);
1503}
1504
1505static sci_t nla_get_sci(const struct nlattr *nla)
1506{
1507 return (__force sci_t)nla_get_u64(nla);
1508}
1509
1510static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value,
1511 int padattr)
1512{
1513 return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr);
1514}
1515
1516static ssci_t nla_get_ssci(const struct nlattr *nla)
1517{
1518 return (__force ssci_t)nla_get_u32(nla);
1519}
1520
1521static int nla_put_ssci(struct sk_buff *skb, int attrtype, ssci_t value)
1522{
1523 return nla_put_u32(skb, attrtype, (__force u64)value);
1524}
1525
1526static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1527 struct nlattr **attrs,
1528 struct nlattr **tb_sa,
1529 struct net_device **devp,
1530 struct macsec_secy **secyp,
1531 struct macsec_tx_sc **scp,
1532 u8 *assoc_num)
1533{
1534 struct net_device *dev;
1535 struct macsec_secy *secy;
1536 struct macsec_tx_sc *tx_sc;
1537 struct macsec_tx_sa *tx_sa;
1538
1539 if (!tb_sa[MACSEC_SA_ATTR_AN])
1540 return ERR_PTR(-EINVAL);
1541
1542 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1543
1544 dev = get_dev_from_nl(net, attrs);
1545 if (IS_ERR(dev))
1546 return ERR_CAST(dev);
1547
1548 if (*assoc_num >= MACSEC_NUM_AN)
1549 return ERR_PTR(-EINVAL);
1550
1551 secy = &macsec_priv(dev)->secy;
1552 tx_sc = &secy->tx_sc;
1553
1554 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1555 if (!tx_sa)
1556 return ERR_PTR(-ENODEV);
1557
1558 *devp = dev;
1559 *scp = tx_sc;
1560 *secyp = secy;
1561 return tx_sa;
1562}
1563
1564static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1565 struct nlattr **attrs,
1566 struct nlattr **tb_rxsc,
1567 struct net_device **devp,
1568 struct macsec_secy **secyp)
1569{
1570 struct net_device *dev;
1571 struct macsec_secy *secy;
1572 struct macsec_rx_sc *rx_sc;
1573 sci_t sci;
1574
1575 dev = get_dev_from_nl(net, attrs);
1576 if (IS_ERR(dev))
1577 return ERR_CAST(dev);
1578
1579 secy = &macsec_priv(dev)->secy;
1580
1581 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1582 return ERR_PTR(-EINVAL);
1583
1584 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1585 rx_sc = find_rx_sc_rtnl(secy, sci);
1586 if (!rx_sc)
1587 return ERR_PTR(-ENODEV);
1588
1589 *secyp = secy;
1590 *devp = dev;
1591
1592 return rx_sc;
1593}
1594
1595static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1596 struct nlattr **attrs,
1597 struct nlattr **tb_rxsc,
1598 struct nlattr **tb_sa,
1599 struct net_device **devp,
1600 struct macsec_secy **secyp,
1601 struct macsec_rx_sc **scp,
1602 u8 *assoc_num)
1603{
1604 struct macsec_rx_sc *rx_sc;
1605 struct macsec_rx_sa *rx_sa;
1606
1607 if (!tb_sa[MACSEC_SA_ATTR_AN])
1608 return ERR_PTR(-EINVAL);
1609
1610 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1611 if (*assoc_num >= MACSEC_NUM_AN)
1612 return ERR_PTR(-EINVAL);
1613
1614 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1615 if (IS_ERR(rx_sc))
1616 return ERR_CAST(rx_sc);
1617
1618 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1619 if (!rx_sa)
1620 return ERR_PTR(-ENODEV);
1621
1622 *scp = rx_sc;
1623 return rx_sa;
1624}
1625
1626static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1627 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1628 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1629 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1630 [MACSEC_ATTR_OFFLOAD] = { .type = NLA_NESTED },
1631};
1632
1633static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1634 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1635 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1636};
1637
1638static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1639 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1640 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1641 [MACSEC_SA_ATTR_PN] = NLA_POLICY_MIN_LEN(4),
1642 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY,
1643 .len = MACSEC_KEYID_LEN, },
1644 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1645 .len = MACSEC_MAX_KEY_LEN, },
1646 [MACSEC_SA_ATTR_SSCI] = { .type = NLA_U32 },
1647 [MACSEC_SA_ATTR_SALT] = { .type = NLA_BINARY,
1648 .len = MACSEC_SALT_LEN, },
1649};
1650
1651static const struct nla_policy macsec_genl_offload_policy[NUM_MACSEC_OFFLOAD_ATTR] = {
1652 [MACSEC_OFFLOAD_ATTR_TYPE] = { .type = NLA_U8 },
1653};
1654
1655/* Offloads an operation to a device driver */
1656static int macsec_offload(int (* const func)(struct macsec_context *),
1657 struct macsec_context *ctx)
1658{
1659 int ret;
1660
1661 if (unlikely(!func))
1662 return 0;
1663
1664 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1665 mutex_lock(&ctx->phydev->lock);
1666
1667 ret = (*func)(ctx);
1668
1669 if (ctx->offload == MACSEC_OFFLOAD_PHY)
1670 mutex_unlock(&ctx->phydev->lock);
1671
1672 return ret;
1673}
1674
1675static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1676{
1677 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1678 return -EINVAL;
1679
1680 if (nla_parse_nested_deprecated(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], macsec_genl_sa_policy, NULL))
1681 return -EINVAL;
1682
1683 return 0;
1684}
1685
1686static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1687{
1688 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1689 return -EINVAL;
1690
1691 if (nla_parse_nested_deprecated(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], macsec_genl_rxsc_policy, NULL))
1692 return -EINVAL;
1693
1694 return 0;
1695}
1696
1697static bool validate_add_rxsa(struct nlattr **attrs)
1698{
1699 if (!attrs[MACSEC_SA_ATTR_AN] ||
1700 !attrs[MACSEC_SA_ATTR_KEY] ||
1701 !attrs[MACSEC_SA_ATTR_KEYID])
1702 return false;
1703
1704 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1705 return false;
1706
1707 if (attrs[MACSEC_SA_ATTR_PN] &&
1708 nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1709 return false;
1710
1711 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1712 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1713 return false;
1714 }
1715
1716 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1717 return false;
1718
1719 return true;
1720}
1721
1722static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1723{
1724 struct net_device *dev;
1725 struct nlattr **attrs = info->attrs;
1726 struct macsec_secy *secy;
1727 struct macsec_rx_sc *rx_sc;
1728 struct macsec_rx_sa *rx_sa;
1729 unsigned char assoc_num;
1730 int pn_len;
1731 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1732 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1733 int err;
1734
1735 if (!attrs[MACSEC_ATTR_IFINDEX])
1736 return -EINVAL;
1737
1738 if (parse_sa_config(attrs, tb_sa))
1739 return -EINVAL;
1740
1741 if (parse_rxsc_config(attrs, tb_rxsc))
1742 return -EINVAL;
1743
1744 if (!validate_add_rxsa(tb_sa))
1745 return -EINVAL;
1746
1747 rtnl_lock();
1748 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1749 if (IS_ERR(rx_sc)) {
1750 rtnl_unlock();
1751 return PTR_ERR(rx_sc);
1752 }
1753
1754 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1755
1756 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1757 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1758 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1759 rtnl_unlock();
1760 return -EINVAL;
1761 }
1762
1763 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
1764 if (tb_sa[MACSEC_SA_ATTR_PN] &&
1765 nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
1766 pr_notice("macsec: nl: add_rxsa: bad pn length: %d != %d\n",
1767 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
1768 rtnl_unlock();
1769 return -EINVAL;
1770 }
1771
1772 if (secy->xpn) {
1773 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
1774 rtnl_unlock();
1775 return -EINVAL;
1776 }
1777
1778 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
1779 pr_notice("macsec: nl: add_rxsa: bad salt length: %d != %d\n",
1780 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
1781 MACSEC_SALT_LEN);
1782 rtnl_unlock();
1783 return -EINVAL;
1784 }
1785 }
1786
1787 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1788 if (rx_sa) {
1789 rtnl_unlock();
1790 return -EBUSY;
1791 }
1792
1793 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
1794 if (!rx_sa) {
1795 rtnl_unlock();
1796 return -ENOMEM;
1797 }
1798
1799 err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1800 secy->key_len, secy->icv_len);
1801 if (err < 0) {
1802 kfree(rx_sa);
1803 rtnl_unlock();
1804 return err;
1805 }
1806
1807 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1808 spin_lock_bh(&rx_sa->lock);
1809 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
1810 spin_unlock_bh(&rx_sa->lock);
1811 }
1812
1813 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1814 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1815
1816 rx_sa->sc = rx_sc;
1817
1818 if (secy->xpn) {
1819 rx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
1820 nla_memcpy(rx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
1821 MACSEC_SALT_LEN);
1822 }
1823
1824 /* If h/w offloading is available, propagate to the device */
1825 if (macsec_is_offloaded(netdev_priv(dev))) {
1826 const struct macsec_ops *ops;
1827 struct macsec_context ctx;
1828
1829 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1830 if (!ops) {
1831 err = -EOPNOTSUPP;
1832 goto cleanup;
1833 }
1834
1835 ctx.sa.assoc_num = assoc_num;
1836 ctx.sa.rx_sa = rx_sa;
1837 ctx.secy = secy;
1838 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1839 secy->key_len);
1840
1841 err = macsec_offload(ops->mdo_add_rxsa, &ctx);
1842 memzero_explicit(ctx.sa.key, secy->key_len);
1843 if (err)
1844 goto cleanup;
1845 }
1846
1847 nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
1848 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1849
1850 rtnl_unlock();
1851
1852 return 0;
1853
1854cleanup:
1855 macsec_rxsa_put(rx_sa);
1856 rtnl_unlock();
1857 return err;
1858}
1859
1860static bool validate_add_rxsc(struct nlattr **attrs)
1861{
1862 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1863 return false;
1864
1865 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1866 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1867 return false;
1868 }
1869
1870 return true;
1871}
1872
1873static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1874{
1875 struct net_device *dev;
1876 sci_t sci = MACSEC_UNDEF_SCI;
1877 struct nlattr **attrs = info->attrs;
1878 struct macsec_rx_sc *rx_sc;
1879 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1880 struct macsec_secy *secy;
1881 bool active = true;
1882 int ret;
1883
1884 if (!attrs[MACSEC_ATTR_IFINDEX])
1885 return -EINVAL;
1886
1887 if (parse_rxsc_config(attrs, tb_rxsc))
1888 return -EINVAL;
1889
1890 if (!validate_add_rxsc(tb_rxsc))
1891 return -EINVAL;
1892
1893 rtnl_lock();
1894 dev = get_dev_from_nl(genl_info_net(info), attrs);
1895 if (IS_ERR(dev)) {
1896 rtnl_unlock();
1897 return PTR_ERR(dev);
1898 }
1899
1900 secy = &macsec_priv(dev)->secy;
1901 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1902
1903 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1904 active = nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1905
1906 rx_sc = create_rx_sc(dev, sci, active);
1907 if (IS_ERR(rx_sc)) {
1908 rtnl_unlock();
1909 return PTR_ERR(rx_sc);
1910 }
1911
1912 if (macsec_is_offloaded(netdev_priv(dev))) {
1913 const struct macsec_ops *ops;
1914 struct macsec_context ctx;
1915
1916 ops = macsec_get_ops(netdev_priv(dev), &ctx);
1917 if (!ops) {
1918 ret = -EOPNOTSUPP;
1919 goto cleanup;
1920 }
1921
1922 ctx.rx_sc = rx_sc;
1923 ctx.secy = secy;
1924
1925 ret = macsec_offload(ops->mdo_add_rxsc, &ctx);
1926 if (ret)
1927 goto cleanup;
1928 }
1929
1930 rtnl_unlock();
1931
1932 return 0;
1933
1934cleanup:
1935 del_rx_sc(secy, sci);
1936 free_rx_sc(rx_sc);
1937 rtnl_unlock();
1938 return ret;
1939}
1940
1941static bool validate_add_txsa(struct nlattr **attrs)
1942{
1943 if (!attrs[MACSEC_SA_ATTR_AN] ||
1944 !attrs[MACSEC_SA_ATTR_PN] ||
1945 !attrs[MACSEC_SA_ATTR_KEY] ||
1946 !attrs[MACSEC_SA_ATTR_KEYID])
1947 return false;
1948
1949 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1950 return false;
1951
1952 if (nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
1953 return false;
1954
1955 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1956 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1957 return false;
1958 }
1959
1960 if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN)
1961 return false;
1962
1963 return true;
1964}
1965
1966static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1967{
1968 struct net_device *dev;
1969 struct nlattr **attrs = info->attrs;
1970 struct macsec_secy *secy;
1971 struct macsec_tx_sc *tx_sc;
1972 struct macsec_tx_sa *tx_sa;
1973 unsigned char assoc_num;
1974 int pn_len;
1975 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1976 bool was_operational;
1977 int err;
1978
1979 if (!attrs[MACSEC_ATTR_IFINDEX])
1980 return -EINVAL;
1981
1982 if (parse_sa_config(attrs, tb_sa))
1983 return -EINVAL;
1984
1985 if (!validate_add_txsa(tb_sa))
1986 return -EINVAL;
1987
1988 rtnl_lock();
1989 dev = get_dev_from_nl(genl_info_net(info), attrs);
1990 if (IS_ERR(dev)) {
1991 rtnl_unlock();
1992 return PTR_ERR(dev);
1993 }
1994
1995 secy = &macsec_priv(dev)->secy;
1996 tx_sc = &secy->tx_sc;
1997
1998 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1999
2000 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
2001 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
2002 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
2003 rtnl_unlock();
2004 return -EINVAL;
2005 }
2006
2007 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2008 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2009 pr_notice("macsec: nl: add_txsa: bad pn length: %d != %d\n",
2010 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2011 rtnl_unlock();
2012 return -EINVAL;
2013 }
2014
2015 if (secy->xpn) {
2016 if (!tb_sa[MACSEC_SA_ATTR_SSCI] || !tb_sa[MACSEC_SA_ATTR_SALT]) {
2017 rtnl_unlock();
2018 return -EINVAL;
2019 }
2020
2021 if (nla_len(tb_sa[MACSEC_SA_ATTR_SALT]) != MACSEC_SALT_LEN) {
2022 pr_notice("macsec: nl: add_txsa: bad salt length: %d != %d\n",
2023 nla_len(tb_sa[MACSEC_SA_ATTR_SALT]),
2024 MACSEC_SALT_LEN);
2025 rtnl_unlock();
2026 return -EINVAL;
2027 }
2028 }
2029
2030 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
2031 if (tx_sa) {
2032 rtnl_unlock();
2033 return -EBUSY;
2034 }
2035
2036 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
2037 if (!tx_sa) {
2038 rtnl_unlock();
2039 return -ENOMEM;
2040 }
2041
2042 err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2043 secy->key_len, secy->icv_len);
2044 if (err < 0) {
2045 kfree(tx_sa);
2046 rtnl_unlock();
2047 return err;
2048 }
2049
2050 spin_lock_bh(&tx_sa->lock);
2051 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2052 spin_unlock_bh(&tx_sa->lock);
2053
2054 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2055 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2056
2057 was_operational = secy->operational;
2058 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
2059 secy->operational = true;
2060
2061 if (secy->xpn) {
2062 tx_sa->ssci = nla_get_ssci(tb_sa[MACSEC_SA_ATTR_SSCI]);
2063 nla_memcpy(tx_sa->key.salt.bytes, tb_sa[MACSEC_SA_ATTR_SALT],
2064 MACSEC_SALT_LEN);
2065 }
2066
2067 /* If h/w offloading is available, propagate to the device */
2068 if (macsec_is_offloaded(netdev_priv(dev))) {
2069 const struct macsec_ops *ops;
2070 struct macsec_context ctx;
2071
2072 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2073 if (!ops) {
2074 err = -EOPNOTSUPP;
2075 goto cleanup;
2076 }
2077
2078 ctx.sa.assoc_num = assoc_num;
2079 ctx.sa.tx_sa = tx_sa;
2080 ctx.secy = secy;
2081 memcpy(ctx.sa.key, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
2082 secy->key_len);
2083
2084 err = macsec_offload(ops->mdo_add_txsa, &ctx);
2085 memzero_explicit(ctx.sa.key, secy->key_len);
2086 if (err)
2087 goto cleanup;
2088 }
2089
2090 nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN);
2091 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
2092
2093 rtnl_unlock();
2094
2095 return 0;
2096
2097cleanup:
2098 secy->operational = was_operational;
2099 macsec_txsa_put(tx_sa);
2100 rtnl_unlock();
2101 return err;
2102}
2103
2104static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
2105{
2106 struct nlattr **attrs = info->attrs;
2107 struct net_device *dev;
2108 struct macsec_secy *secy;
2109 struct macsec_rx_sc *rx_sc;
2110 struct macsec_rx_sa *rx_sa;
2111 u8 assoc_num;
2112 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2113 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2114 int ret;
2115
2116 if (!attrs[MACSEC_ATTR_IFINDEX])
2117 return -EINVAL;
2118
2119 if (parse_sa_config(attrs, tb_sa))
2120 return -EINVAL;
2121
2122 if (parse_rxsc_config(attrs, tb_rxsc))
2123 return -EINVAL;
2124
2125 rtnl_lock();
2126 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2127 &dev, &secy, &rx_sc, &assoc_num);
2128 if (IS_ERR(rx_sa)) {
2129 rtnl_unlock();
2130 return PTR_ERR(rx_sa);
2131 }
2132
2133 if (rx_sa->active) {
2134 rtnl_unlock();
2135 return -EBUSY;
2136 }
2137
2138 /* If h/w offloading is available, propagate to the device */
2139 if (macsec_is_offloaded(netdev_priv(dev))) {
2140 const struct macsec_ops *ops;
2141 struct macsec_context ctx;
2142
2143 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2144 if (!ops) {
2145 ret = -EOPNOTSUPP;
2146 goto cleanup;
2147 }
2148
2149 ctx.sa.assoc_num = assoc_num;
2150 ctx.sa.rx_sa = rx_sa;
2151 ctx.secy = secy;
2152
2153 ret = macsec_offload(ops->mdo_del_rxsa, &ctx);
2154 if (ret)
2155 goto cleanup;
2156 }
2157
2158 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
2159 clear_rx_sa(rx_sa);
2160
2161 rtnl_unlock();
2162
2163 return 0;
2164
2165cleanup:
2166 rtnl_unlock();
2167 return ret;
2168}
2169
2170static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
2171{
2172 struct nlattr **attrs = info->attrs;
2173 struct net_device *dev;
2174 struct macsec_secy *secy;
2175 struct macsec_rx_sc *rx_sc;
2176 sci_t sci;
2177 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2178 int ret;
2179
2180 if (!attrs[MACSEC_ATTR_IFINDEX])
2181 return -EINVAL;
2182
2183 if (parse_rxsc_config(attrs, tb_rxsc))
2184 return -EINVAL;
2185
2186 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
2187 return -EINVAL;
2188
2189 rtnl_lock();
2190 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
2191 if (IS_ERR(dev)) {
2192 rtnl_unlock();
2193 return PTR_ERR(dev);
2194 }
2195
2196 secy = &macsec_priv(dev)->secy;
2197 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
2198
2199 rx_sc = del_rx_sc(secy, sci);
2200 if (!rx_sc) {
2201 rtnl_unlock();
2202 return -ENODEV;
2203 }
2204
2205 /* If h/w offloading is available, propagate to the device */
2206 if (macsec_is_offloaded(netdev_priv(dev))) {
2207 const struct macsec_ops *ops;
2208 struct macsec_context ctx;
2209
2210 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2211 if (!ops) {
2212 ret = -EOPNOTSUPP;
2213 goto cleanup;
2214 }
2215
2216 ctx.rx_sc = rx_sc;
2217 ctx.secy = secy;
2218 ret = macsec_offload(ops->mdo_del_rxsc, &ctx);
2219 if (ret)
2220 goto cleanup;
2221 }
2222
2223 free_rx_sc(rx_sc);
2224 rtnl_unlock();
2225
2226 return 0;
2227
2228cleanup:
2229 rtnl_unlock();
2230 return ret;
2231}
2232
2233static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
2234{
2235 struct nlattr **attrs = info->attrs;
2236 struct net_device *dev;
2237 struct macsec_secy *secy;
2238 struct macsec_tx_sc *tx_sc;
2239 struct macsec_tx_sa *tx_sa;
2240 u8 assoc_num;
2241 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2242 int ret;
2243
2244 if (!attrs[MACSEC_ATTR_IFINDEX])
2245 return -EINVAL;
2246
2247 if (parse_sa_config(attrs, tb_sa))
2248 return -EINVAL;
2249
2250 rtnl_lock();
2251 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2252 &dev, &secy, &tx_sc, &assoc_num);
2253 if (IS_ERR(tx_sa)) {
2254 rtnl_unlock();
2255 return PTR_ERR(tx_sa);
2256 }
2257
2258 if (tx_sa->active) {
2259 rtnl_unlock();
2260 return -EBUSY;
2261 }
2262
2263 /* If h/w offloading is available, propagate to the device */
2264 if (macsec_is_offloaded(netdev_priv(dev))) {
2265 const struct macsec_ops *ops;
2266 struct macsec_context ctx;
2267
2268 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2269 if (!ops) {
2270 ret = -EOPNOTSUPP;
2271 goto cleanup;
2272 }
2273
2274 ctx.sa.assoc_num = assoc_num;
2275 ctx.sa.tx_sa = tx_sa;
2276 ctx.secy = secy;
2277
2278 ret = macsec_offload(ops->mdo_del_txsa, &ctx);
2279 if (ret)
2280 goto cleanup;
2281 }
2282
2283 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
2284 clear_tx_sa(tx_sa);
2285
2286 rtnl_unlock();
2287
2288 return 0;
2289
2290cleanup:
2291 rtnl_unlock();
2292 return ret;
2293}
2294
2295static bool validate_upd_sa(struct nlattr **attrs)
2296{
2297 if (!attrs[MACSEC_SA_ATTR_AN] ||
2298 attrs[MACSEC_SA_ATTR_KEY] ||
2299 attrs[MACSEC_SA_ATTR_KEYID] ||
2300 attrs[MACSEC_SA_ATTR_SSCI] ||
2301 attrs[MACSEC_SA_ATTR_SALT])
2302 return false;
2303
2304 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
2305 return false;
2306
2307 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u64(attrs[MACSEC_SA_ATTR_PN]) == 0)
2308 return false;
2309
2310 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
2311 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
2312 return false;
2313 }
2314
2315 return true;
2316}
2317
2318static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
2319{
2320 struct nlattr **attrs = info->attrs;
2321 struct net_device *dev;
2322 struct macsec_secy *secy;
2323 struct macsec_tx_sc *tx_sc;
2324 struct macsec_tx_sa *tx_sa;
2325 u8 assoc_num;
2326 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2327 bool was_operational, was_active;
2328 pn_t prev_pn;
2329 int ret = 0;
2330
2331 prev_pn.full64 = 0;
2332
2333 if (!attrs[MACSEC_ATTR_IFINDEX])
2334 return -EINVAL;
2335
2336 if (parse_sa_config(attrs, tb_sa))
2337 return -EINVAL;
2338
2339 if (!validate_upd_sa(tb_sa))
2340 return -EINVAL;
2341
2342 rtnl_lock();
2343 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
2344 &dev, &secy, &tx_sc, &assoc_num);
2345 if (IS_ERR(tx_sa)) {
2346 rtnl_unlock();
2347 return PTR_ERR(tx_sa);
2348 }
2349
2350 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2351 int pn_len;
2352
2353 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2354 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2355 pr_notice("macsec: nl: upd_txsa: bad pn length: %d != %d\n",
2356 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2357 rtnl_unlock();
2358 return -EINVAL;
2359 }
2360
2361 spin_lock_bh(&tx_sa->lock);
2362 prev_pn = tx_sa->next_pn_halves;
2363 tx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2364 spin_unlock_bh(&tx_sa->lock);
2365 }
2366
2367 was_active = tx_sa->active;
2368 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2369 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2370
2371 was_operational = secy->operational;
2372 if (assoc_num == tx_sc->encoding_sa)
2373 secy->operational = tx_sa->active;
2374
2375 /* If h/w offloading is available, propagate to the device */
2376 if (macsec_is_offloaded(netdev_priv(dev))) {
2377 const struct macsec_ops *ops;
2378 struct macsec_context ctx;
2379
2380 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2381 if (!ops) {
2382 ret = -EOPNOTSUPP;
2383 goto cleanup;
2384 }
2385
2386 ctx.sa.assoc_num = assoc_num;
2387 ctx.sa.tx_sa = tx_sa;
2388 ctx.secy = secy;
2389
2390 ret = macsec_offload(ops->mdo_upd_txsa, &ctx);
2391 if (ret)
2392 goto cleanup;
2393 }
2394
2395 rtnl_unlock();
2396
2397 return 0;
2398
2399cleanup:
2400 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2401 spin_lock_bh(&tx_sa->lock);
2402 tx_sa->next_pn_halves = prev_pn;
2403 spin_unlock_bh(&tx_sa->lock);
2404 }
2405 tx_sa->active = was_active;
2406 secy->operational = was_operational;
2407 rtnl_unlock();
2408 return ret;
2409}
2410
2411static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
2412{
2413 struct nlattr **attrs = info->attrs;
2414 struct net_device *dev;
2415 struct macsec_secy *secy;
2416 struct macsec_rx_sc *rx_sc;
2417 struct macsec_rx_sa *rx_sa;
2418 u8 assoc_num;
2419 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2420 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
2421 bool was_active;
2422 pn_t prev_pn;
2423 int ret = 0;
2424
2425 prev_pn.full64 = 0;
2426
2427 if (!attrs[MACSEC_ATTR_IFINDEX])
2428 return -EINVAL;
2429
2430 if (parse_rxsc_config(attrs, tb_rxsc))
2431 return -EINVAL;
2432
2433 if (parse_sa_config(attrs, tb_sa))
2434 return -EINVAL;
2435
2436 if (!validate_upd_sa(tb_sa))
2437 return -EINVAL;
2438
2439 rtnl_lock();
2440 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2441 &dev, &secy, &rx_sc, &assoc_num);
2442 if (IS_ERR(rx_sa)) {
2443 rtnl_unlock();
2444 return PTR_ERR(rx_sa);
2445 }
2446
2447 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2448 int pn_len;
2449
2450 pn_len = secy->xpn ? MACSEC_XPN_PN_LEN : MACSEC_DEFAULT_PN_LEN;
2451 if (nla_len(tb_sa[MACSEC_SA_ATTR_PN]) != pn_len) {
2452 pr_notice("macsec: nl: upd_rxsa: bad pn length: %d != %d\n",
2453 nla_len(tb_sa[MACSEC_SA_ATTR_PN]), pn_len);
2454 rtnl_unlock();
2455 return -EINVAL;
2456 }
2457
2458 spin_lock_bh(&rx_sa->lock);
2459 prev_pn = rx_sa->next_pn_halves;
2460 rx_sa->next_pn = nla_get_u64(tb_sa[MACSEC_SA_ATTR_PN]);
2461 spin_unlock_bh(&rx_sa->lock);
2462 }
2463
2464 was_active = rx_sa->active;
2465 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2466 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2467
2468 /* If h/w offloading is available, propagate to the device */
2469 if (macsec_is_offloaded(netdev_priv(dev))) {
2470 const struct macsec_ops *ops;
2471 struct macsec_context ctx;
2472
2473 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2474 if (!ops) {
2475 ret = -EOPNOTSUPP;
2476 goto cleanup;
2477 }
2478
2479 ctx.sa.assoc_num = assoc_num;
2480 ctx.sa.rx_sa = rx_sa;
2481 ctx.secy = secy;
2482
2483 ret = macsec_offload(ops->mdo_upd_rxsa, &ctx);
2484 if (ret)
2485 goto cleanup;
2486 }
2487
2488 rtnl_unlock();
2489 return 0;
2490
2491cleanup:
2492 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2493 spin_lock_bh(&rx_sa->lock);
2494 rx_sa->next_pn_halves = prev_pn;
2495 spin_unlock_bh(&rx_sa->lock);
2496 }
2497 rx_sa->active = was_active;
2498 rtnl_unlock();
2499 return ret;
2500}
2501
2502static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2503{
2504 struct nlattr **attrs = info->attrs;
2505 struct net_device *dev;
2506 struct macsec_secy *secy;
2507 struct macsec_rx_sc *rx_sc;
2508 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2509 unsigned int prev_n_rx_sc;
2510 bool was_active;
2511 int ret;
2512
2513 if (!attrs[MACSEC_ATTR_IFINDEX])
2514 return -EINVAL;
2515
2516 if (parse_rxsc_config(attrs, tb_rxsc))
2517 return -EINVAL;
2518
2519 if (!validate_add_rxsc(tb_rxsc))
2520 return -EINVAL;
2521
2522 rtnl_lock();
2523 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2524 if (IS_ERR(rx_sc)) {
2525 rtnl_unlock();
2526 return PTR_ERR(rx_sc);
2527 }
2528
2529 was_active = rx_sc->active;
2530 prev_n_rx_sc = secy->n_rx_sc;
2531 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2532 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2533
2534 if (rx_sc->active != new)
2535 secy->n_rx_sc += new ? 1 : -1;
2536
2537 rx_sc->active = new;
2538 }
2539
2540 /* If h/w offloading is available, propagate to the device */
2541 if (macsec_is_offloaded(netdev_priv(dev))) {
2542 const struct macsec_ops *ops;
2543 struct macsec_context ctx;
2544
2545 ops = macsec_get_ops(netdev_priv(dev), &ctx);
2546 if (!ops) {
2547 ret = -EOPNOTSUPP;
2548 goto cleanup;
2549 }
2550
2551 ctx.rx_sc = rx_sc;
2552 ctx.secy = secy;
2553
2554 ret = macsec_offload(ops->mdo_upd_rxsc, &ctx);
2555 if (ret)
2556 goto cleanup;
2557 }
2558
2559 rtnl_unlock();
2560
2561 return 0;
2562
2563cleanup:
2564 secy->n_rx_sc = prev_n_rx_sc;
2565 rx_sc->active = was_active;
2566 rtnl_unlock();
2567 return ret;
2568}
2569
2570static bool macsec_is_configured(struct macsec_dev *macsec)
2571{
2572 struct macsec_secy *secy = &macsec->secy;
2573 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2574 int i;
2575
2576 if (secy->rx_sc)
2577 return true;
2578
2579 for (i = 0; i < MACSEC_NUM_AN; i++)
2580 if (tx_sc->sa[i])
2581 return true;
2582
2583 return false;
2584}
2585
2586static int macsec_upd_offload(struct sk_buff *skb, struct genl_info *info)
2587{
2588 struct nlattr *tb_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
2589 enum macsec_offload offload, prev_offload;
2590 int (*func)(struct macsec_context *ctx);
2591 struct nlattr **attrs = info->attrs;
2592 struct net_device *dev;
2593 const struct macsec_ops *ops;
2594 struct macsec_context ctx;
2595 struct macsec_dev *macsec;
2596 int ret = 0;
2597
2598 if (!attrs[MACSEC_ATTR_IFINDEX])
2599 return -EINVAL;
2600
2601 if (!attrs[MACSEC_ATTR_OFFLOAD])
2602 return -EINVAL;
2603
2604 if (nla_parse_nested_deprecated(tb_offload, MACSEC_OFFLOAD_ATTR_MAX,
2605 attrs[MACSEC_ATTR_OFFLOAD],
2606 macsec_genl_offload_policy, NULL))
2607 return -EINVAL;
2608
2609 rtnl_lock();
2610
2611 dev = get_dev_from_nl(genl_info_net(info), attrs);
2612 if (IS_ERR(dev)) {
2613 ret = PTR_ERR(dev);
2614 goto out;
2615 }
2616 macsec = macsec_priv(dev);
2617
2618 if (!tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]) {
2619 ret = -EINVAL;
2620 goto out;
2621 }
2622
2623 offload = nla_get_u8(tb_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
2624 if (macsec->offload == offload)
2625 goto out;
2626
2627 /* Check if the offloading mode is supported by the underlying layers */
2628 if (offload != MACSEC_OFFLOAD_OFF &&
2629 !macsec_check_offload(offload, macsec)) {
2630 ret = -EOPNOTSUPP;
2631 goto out;
2632 }
2633
2634 /* Check if the net device is busy. */
2635 if (netif_running(dev)) {
2636 ret = -EBUSY;
2637 goto out;
2638 }
2639
2640 prev_offload = macsec->offload;
2641 macsec->offload = offload;
2642
2643 /* Check if the device already has rules configured: we do not support
2644 * rules migration.
2645 */
2646 if (macsec_is_configured(macsec)) {
2647 ret = -EBUSY;
2648 goto rollback;
2649 }
2650
2651 ops = __macsec_get_ops(offload == MACSEC_OFFLOAD_OFF ? prev_offload : offload,
2652 macsec, &ctx);
2653 if (!ops) {
2654 ret = -EOPNOTSUPP;
2655 goto rollback;
2656 }
2657
2658 if (prev_offload == MACSEC_OFFLOAD_OFF)
2659 func = ops->mdo_add_secy;
2660 else
2661 func = ops->mdo_del_secy;
2662
2663 ctx.secy = &macsec->secy;
2664 ret = macsec_offload(func, &ctx);
2665 if (ret)
2666 goto rollback;
2667
2668 rtnl_unlock();
2669 return 0;
2670
2671rollback:
2672 macsec->offload = prev_offload;
2673out:
2674 rtnl_unlock();
2675 return ret;
2676}
2677
2678static void get_tx_sa_stats(struct net_device *dev, int an,
2679 struct macsec_tx_sa *tx_sa,
2680 struct macsec_tx_sa_stats *sum)
2681{
2682 struct macsec_dev *macsec = macsec_priv(dev);
2683 int cpu;
2684
2685 /* If h/w offloading is available, propagate to the device */
2686 if (macsec_is_offloaded(macsec)) {
2687 const struct macsec_ops *ops;
2688 struct macsec_context ctx;
2689
2690 ops = macsec_get_ops(macsec, &ctx);
2691 if (ops) {
2692 ctx.sa.assoc_num = an;
2693 ctx.sa.tx_sa = tx_sa;
2694 ctx.stats.tx_sa_stats = sum;
2695 ctx.secy = &macsec_priv(dev)->secy;
2696 macsec_offload(ops->mdo_get_tx_sa_stats, &ctx);
2697 }
2698 return;
2699 }
2700
2701 for_each_possible_cpu(cpu) {
2702 const struct macsec_tx_sa_stats *stats =
2703 per_cpu_ptr(tx_sa->stats, cpu);
2704
2705 sum->OutPktsProtected += stats->OutPktsProtected;
2706 sum->OutPktsEncrypted += stats->OutPktsEncrypted;
2707 }
2708}
2709
2710static int copy_tx_sa_stats(struct sk_buff *skb, struct macsec_tx_sa_stats *sum)
2711{
2712 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED,
2713 sum->OutPktsProtected) ||
2714 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2715 sum->OutPktsEncrypted))
2716 return -EMSGSIZE;
2717
2718 return 0;
2719}
2720
2721static void get_rx_sa_stats(struct net_device *dev,
2722 struct macsec_rx_sc *rx_sc, int an,
2723 struct macsec_rx_sa *rx_sa,
2724 struct macsec_rx_sa_stats *sum)
2725{
2726 struct macsec_dev *macsec = macsec_priv(dev);
2727 int cpu;
2728
2729 /* If h/w offloading is available, propagate to the device */
2730 if (macsec_is_offloaded(macsec)) {
2731 const struct macsec_ops *ops;
2732 struct macsec_context ctx;
2733
2734 ops = macsec_get_ops(macsec, &ctx);
2735 if (ops) {
2736 ctx.sa.assoc_num = an;
2737 ctx.sa.rx_sa = rx_sa;
2738 ctx.stats.rx_sa_stats = sum;
2739 ctx.secy = &macsec_priv(dev)->secy;
2740 ctx.rx_sc = rx_sc;
2741 macsec_offload(ops->mdo_get_rx_sa_stats, &ctx);
2742 }
2743 return;
2744 }
2745
2746 for_each_possible_cpu(cpu) {
2747 const struct macsec_rx_sa_stats *stats =
2748 per_cpu_ptr(rx_sa->stats, cpu);
2749
2750 sum->InPktsOK += stats->InPktsOK;
2751 sum->InPktsInvalid += stats->InPktsInvalid;
2752 sum->InPktsNotValid += stats->InPktsNotValid;
2753 sum->InPktsNotUsingSA += stats->InPktsNotUsingSA;
2754 sum->InPktsUnusedSA += stats->InPktsUnusedSA;
2755 }
2756}
2757
2758static int copy_rx_sa_stats(struct sk_buff *skb,
2759 struct macsec_rx_sa_stats *sum)
2760{
2761 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum->InPktsOK) ||
2762 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID,
2763 sum->InPktsInvalid) ||
2764 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID,
2765 sum->InPktsNotValid) ||
2766 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2767 sum->InPktsNotUsingSA) ||
2768 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA,
2769 sum->InPktsUnusedSA))
2770 return -EMSGSIZE;
2771
2772 return 0;
2773}
2774
2775static void get_rx_sc_stats(struct net_device *dev,
2776 struct macsec_rx_sc *rx_sc,
2777 struct macsec_rx_sc_stats *sum)
2778{
2779 struct macsec_dev *macsec = macsec_priv(dev);
2780 int cpu;
2781
2782 /* If h/w offloading is available, propagate to the device */
2783 if (macsec_is_offloaded(macsec)) {
2784 const struct macsec_ops *ops;
2785 struct macsec_context ctx;
2786
2787 ops = macsec_get_ops(macsec, &ctx);
2788 if (ops) {
2789 ctx.stats.rx_sc_stats = sum;
2790 ctx.secy = &macsec_priv(dev)->secy;
2791 ctx.rx_sc = rx_sc;
2792 macsec_offload(ops->mdo_get_rx_sc_stats, &ctx);
2793 }
2794 return;
2795 }
2796
2797 for_each_possible_cpu(cpu) {
2798 const struct pcpu_rx_sc_stats *stats;
2799 struct macsec_rx_sc_stats tmp;
2800 unsigned int start;
2801
2802 stats = per_cpu_ptr(rx_sc->stats, cpu);
2803 do {
2804 start = u64_stats_fetch_begin(&stats->syncp);
2805 memcpy(&tmp, &stats->stats, sizeof(tmp));
2806 } while (u64_stats_fetch_retry(&stats->syncp, start));
2807
2808 sum->InOctetsValidated += tmp.InOctetsValidated;
2809 sum->InOctetsDecrypted += tmp.InOctetsDecrypted;
2810 sum->InPktsUnchecked += tmp.InPktsUnchecked;
2811 sum->InPktsDelayed += tmp.InPktsDelayed;
2812 sum->InPktsOK += tmp.InPktsOK;
2813 sum->InPktsInvalid += tmp.InPktsInvalid;
2814 sum->InPktsLate += tmp.InPktsLate;
2815 sum->InPktsNotValid += tmp.InPktsNotValid;
2816 sum->InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2817 sum->InPktsUnusedSA += tmp.InPktsUnusedSA;
2818 }
2819}
2820
2821static int copy_rx_sc_stats(struct sk_buff *skb, struct macsec_rx_sc_stats *sum)
2822{
2823 if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED,
2824 sum->InOctetsValidated,
2825 MACSEC_RXSC_STATS_ATTR_PAD) ||
2826 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED,
2827 sum->InOctetsDecrypted,
2828 MACSEC_RXSC_STATS_ATTR_PAD) ||
2829 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED,
2830 sum->InPktsUnchecked,
2831 MACSEC_RXSC_STATS_ATTR_PAD) ||
2832 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED,
2833 sum->InPktsDelayed,
2834 MACSEC_RXSC_STATS_ATTR_PAD) ||
2835 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK,
2836 sum->InPktsOK,
2837 MACSEC_RXSC_STATS_ATTR_PAD) ||
2838 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID,
2839 sum->InPktsInvalid,
2840 MACSEC_RXSC_STATS_ATTR_PAD) ||
2841 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE,
2842 sum->InPktsLate,
2843 MACSEC_RXSC_STATS_ATTR_PAD) ||
2844 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID,
2845 sum->InPktsNotValid,
2846 MACSEC_RXSC_STATS_ATTR_PAD) ||
2847 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA,
2848 sum->InPktsNotUsingSA,
2849 MACSEC_RXSC_STATS_ATTR_PAD) ||
2850 nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA,
2851 sum->InPktsUnusedSA,
2852 MACSEC_RXSC_STATS_ATTR_PAD))
2853 return -EMSGSIZE;
2854
2855 return 0;
2856}
2857
2858static void get_tx_sc_stats(struct net_device *dev,
2859 struct macsec_tx_sc_stats *sum)
2860{
2861 struct macsec_dev *macsec = macsec_priv(dev);
2862 int cpu;
2863
2864 /* If h/w offloading is available, propagate to the device */
2865 if (macsec_is_offloaded(macsec)) {
2866 const struct macsec_ops *ops;
2867 struct macsec_context ctx;
2868
2869 ops = macsec_get_ops(macsec, &ctx);
2870 if (ops) {
2871 ctx.stats.tx_sc_stats = sum;
2872 ctx.secy = &macsec_priv(dev)->secy;
2873 macsec_offload(ops->mdo_get_tx_sc_stats, &ctx);
2874 }
2875 return;
2876 }
2877
2878 for_each_possible_cpu(cpu) {
2879 const struct pcpu_tx_sc_stats *stats;
2880 struct macsec_tx_sc_stats tmp;
2881 unsigned int start;
2882
2883 stats = per_cpu_ptr(macsec_priv(dev)->secy.tx_sc.stats, cpu);
2884 do {
2885 start = u64_stats_fetch_begin(&stats->syncp);
2886 memcpy(&tmp, &stats->stats, sizeof(tmp));
2887 } while (u64_stats_fetch_retry(&stats->syncp, start));
2888
2889 sum->OutPktsProtected += tmp.OutPktsProtected;
2890 sum->OutPktsEncrypted += tmp.OutPktsEncrypted;
2891 sum->OutOctetsProtected += tmp.OutOctetsProtected;
2892 sum->OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2893 }
2894}
2895
2896static int copy_tx_sc_stats(struct sk_buff *skb, struct macsec_tx_sc_stats *sum)
2897{
2898 if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED,
2899 sum->OutPktsProtected,
2900 MACSEC_TXSC_STATS_ATTR_PAD) ||
2901 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED,
2902 sum->OutPktsEncrypted,
2903 MACSEC_TXSC_STATS_ATTR_PAD) ||
2904 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED,
2905 sum->OutOctetsProtected,
2906 MACSEC_TXSC_STATS_ATTR_PAD) ||
2907 nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED,
2908 sum->OutOctetsEncrypted,
2909 MACSEC_TXSC_STATS_ATTR_PAD))
2910 return -EMSGSIZE;
2911
2912 return 0;
2913}
2914
2915static void get_secy_stats(struct net_device *dev, struct macsec_dev_stats *sum)
2916{
2917 struct macsec_dev *macsec = macsec_priv(dev);
2918 int cpu;
2919
2920 /* If h/w offloading is available, propagate to the device */
2921 if (macsec_is_offloaded(macsec)) {
2922 const struct macsec_ops *ops;
2923 struct macsec_context ctx;
2924
2925 ops = macsec_get_ops(macsec, &ctx);
2926 if (ops) {
2927 ctx.stats.dev_stats = sum;
2928 ctx.secy = &macsec_priv(dev)->secy;
2929 macsec_offload(ops->mdo_get_dev_stats, &ctx);
2930 }
2931 return;
2932 }
2933
2934 for_each_possible_cpu(cpu) {
2935 const struct pcpu_secy_stats *stats;
2936 struct macsec_dev_stats tmp;
2937 unsigned int start;
2938
2939 stats = per_cpu_ptr(macsec_priv(dev)->stats, cpu);
2940 do {
2941 start = u64_stats_fetch_begin(&stats->syncp);
2942 memcpy(&tmp, &stats->stats, sizeof(tmp));
2943 } while (u64_stats_fetch_retry(&stats->syncp, start));
2944
2945 sum->OutPktsUntagged += tmp.OutPktsUntagged;
2946 sum->InPktsUntagged += tmp.InPktsUntagged;
2947 sum->OutPktsTooLong += tmp.OutPktsTooLong;
2948 sum->InPktsNoTag += tmp.InPktsNoTag;
2949 sum->InPktsBadTag += tmp.InPktsBadTag;
2950 sum->InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2951 sum->InPktsNoSCI += tmp.InPktsNoSCI;
2952 sum->InPktsOverrun += tmp.InPktsOverrun;
2953 }
2954}
2955
2956static int copy_secy_stats(struct sk_buff *skb, struct macsec_dev_stats *sum)
2957{
2958 if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED,
2959 sum->OutPktsUntagged,
2960 MACSEC_SECY_STATS_ATTR_PAD) ||
2961 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED,
2962 sum->InPktsUntagged,
2963 MACSEC_SECY_STATS_ATTR_PAD) ||
2964 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG,
2965 sum->OutPktsTooLong,
2966 MACSEC_SECY_STATS_ATTR_PAD) ||
2967 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG,
2968 sum->InPktsNoTag,
2969 MACSEC_SECY_STATS_ATTR_PAD) ||
2970 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG,
2971 sum->InPktsBadTag,
2972 MACSEC_SECY_STATS_ATTR_PAD) ||
2973 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI,
2974 sum->InPktsUnknownSCI,
2975 MACSEC_SECY_STATS_ATTR_PAD) ||
2976 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI,
2977 sum->InPktsNoSCI,
2978 MACSEC_SECY_STATS_ATTR_PAD) ||
2979 nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN,
2980 sum->InPktsOverrun,
2981 MACSEC_SECY_STATS_ATTR_PAD))
2982 return -EMSGSIZE;
2983
2984 return 0;
2985}
2986
2987static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2988{
2989 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2990 struct nlattr *secy_nest = nla_nest_start_noflag(skb,
2991 MACSEC_ATTR_SECY);
2992 u64 csid;
2993
2994 if (!secy_nest)
2995 return 1;
2996
2997 switch (secy->key_len) {
2998 case MACSEC_GCM_AES_128_SAK_LEN:
2999 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
3000 break;
3001 case MACSEC_GCM_AES_256_SAK_LEN:
3002 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
3003 break;
3004 default:
3005 goto cancel;
3006 }
3007
3008 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci,
3009 MACSEC_SECY_ATTR_PAD) ||
3010 nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE,
3011 csid, MACSEC_SECY_ATTR_PAD) ||
3012 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
3013 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
3014 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
3015 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
3016 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
3017 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
3018 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
3019 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
3020 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
3021 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
3022 goto cancel;
3023
3024 if (secy->replay_protect) {
3025 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
3026 goto cancel;
3027 }
3028
3029 nla_nest_end(skb, secy_nest);
3030 return 0;
3031
3032cancel:
3033 nla_nest_cancel(skb, secy_nest);
3034 return 1;
3035}
3036
3037static noinline_for_stack int
3038dump_secy(struct macsec_secy *secy, struct net_device *dev,
3039 struct sk_buff *skb, struct netlink_callback *cb)
3040{
3041 struct macsec_tx_sc_stats tx_sc_stats = {0, };
3042 struct macsec_tx_sa_stats tx_sa_stats = {0, };
3043 struct macsec_rx_sc_stats rx_sc_stats = {0, };
3044 struct macsec_rx_sa_stats rx_sa_stats = {0, };
3045 struct macsec_dev *macsec = netdev_priv(dev);
3046 struct macsec_dev_stats dev_stats = {0, };
3047 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3048 struct nlattr *txsa_list, *rxsc_list;
3049 struct macsec_rx_sc *rx_sc;
3050 struct nlattr *attr;
3051 void *hdr;
3052 int i, j;
3053
3054 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
3055 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
3056 if (!hdr)
3057 return -EMSGSIZE;
3058
3059 genl_dump_check_consistent(cb, hdr);
3060
3061 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
3062 goto nla_put_failure;
3063
3064 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_OFFLOAD);
3065 if (!attr)
3066 goto nla_put_failure;
3067 if (nla_put_u8(skb, MACSEC_OFFLOAD_ATTR_TYPE, macsec->offload))
3068 goto nla_put_failure;
3069 nla_nest_end(skb, attr);
3070
3071 if (nla_put_secy(secy, skb))
3072 goto nla_put_failure;
3073
3074 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSC_STATS);
3075 if (!attr)
3076 goto nla_put_failure;
3077
3078 get_tx_sc_stats(dev, &tx_sc_stats);
3079 if (copy_tx_sc_stats(skb, &tx_sc_stats)) {
3080 nla_nest_cancel(skb, attr);
3081 goto nla_put_failure;
3082 }
3083 nla_nest_end(skb, attr);
3084
3085 attr = nla_nest_start_noflag(skb, MACSEC_ATTR_SECY_STATS);
3086 if (!attr)
3087 goto nla_put_failure;
3088 get_secy_stats(dev, &dev_stats);
3089 if (copy_secy_stats(skb, &dev_stats)) {
3090 nla_nest_cancel(skb, attr);
3091 goto nla_put_failure;
3092 }
3093 nla_nest_end(skb, attr);
3094
3095 txsa_list = nla_nest_start_noflag(skb, MACSEC_ATTR_TXSA_LIST);
3096 if (!txsa_list)
3097 goto nla_put_failure;
3098 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
3099 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
3100 struct nlattr *txsa_nest;
3101 u64 pn;
3102 int pn_len;
3103
3104 if (!tx_sa)
3105 continue;
3106
3107 txsa_nest = nla_nest_start_noflag(skb, j++);
3108 if (!txsa_nest) {
3109 nla_nest_cancel(skb, txsa_list);
3110 goto nla_put_failure;
3111 }
3112
3113 attr = nla_nest_start_noflag(skb, MACSEC_SA_ATTR_STATS);
3114 if (!attr) {
3115 nla_nest_cancel(skb, txsa_nest);
3116 nla_nest_cancel(skb, txsa_list);
3117 goto nla_put_failure;
3118 }
3119 memset(&tx_sa_stats, 0, sizeof(tx_sa_stats));
3120 get_tx_sa_stats(dev, i, tx_sa, &tx_sa_stats);
3121 if (copy_tx_sa_stats(skb, &tx_sa_stats)) {
3122 nla_nest_cancel(skb, attr);
3123 nla_nest_cancel(skb, txsa_nest);
3124 nla_nest_cancel(skb, txsa_list);
3125 goto nla_put_failure;
3126 }
3127 nla_nest_end(skb, attr);
3128
3129 if (secy->xpn) {
3130 pn = tx_sa->next_pn;
3131 pn_len = MACSEC_XPN_PN_LEN;
3132 } else {
3133 pn = tx_sa->next_pn_halves.lower;
3134 pn_len = MACSEC_DEFAULT_PN_LEN;
3135 }
3136
3137 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3138 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3139 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) ||
3140 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, tx_sa->ssci)) ||
3141 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
3142 nla_nest_cancel(skb, txsa_nest);
3143 nla_nest_cancel(skb, txsa_list);
3144 goto nla_put_failure;
3145 }
3146
3147 nla_nest_end(skb, txsa_nest);
3148 }
3149 nla_nest_end(skb, txsa_list);
3150
3151 rxsc_list = nla_nest_start_noflag(skb, MACSEC_ATTR_RXSC_LIST);
3152 if (!rxsc_list)
3153 goto nla_put_failure;
3154
3155 j = 1;
3156 for_each_rxsc_rtnl(secy, rx_sc) {
3157 int k;
3158 struct nlattr *rxsa_list;
3159 struct nlattr *rxsc_nest = nla_nest_start_noflag(skb, j++);
3160
3161 if (!rxsc_nest) {
3162 nla_nest_cancel(skb, rxsc_list);
3163 goto nla_put_failure;
3164 }
3165
3166 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
3167 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci,
3168 MACSEC_RXSC_ATTR_PAD)) {
3169 nla_nest_cancel(skb, rxsc_nest);
3170 nla_nest_cancel(skb, rxsc_list);
3171 goto nla_put_failure;
3172 }
3173
3174 attr = nla_nest_start_noflag(skb, MACSEC_RXSC_ATTR_STATS);
3175 if (!attr) {
3176 nla_nest_cancel(skb, rxsc_nest);
3177 nla_nest_cancel(skb, rxsc_list);
3178 goto nla_put_failure;
3179 }
3180 memset(&rx_sc_stats, 0, sizeof(rx_sc_stats));
3181 get_rx_sc_stats(dev, rx_sc, &rx_sc_stats);
3182 if (copy_rx_sc_stats(skb, &rx_sc_stats)) {
3183 nla_nest_cancel(skb, attr);
3184 nla_nest_cancel(skb, rxsc_nest);
3185 nla_nest_cancel(skb, rxsc_list);
3186 goto nla_put_failure;
3187 }
3188 nla_nest_end(skb, attr);
3189
3190 rxsa_list = nla_nest_start_noflag(skb,
3191 MACSEC_RXSC_ATTR_SA_LIST);
3192 if (!rxsa_list) {
3193 nla_nest_cancel(skb, rxsc_nest);
3194 nla_nest_cancel(skb, rxsc_list);
3195 goto nla_put_failure;
3196 }
3197
3198 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
3199 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
3200 struct nlattr *rxsa_nest;
3201 u64 pn;
3202 int pn_len;
3203
3204 if (!rx_sa)
3205 continue;
3206
3207 rxsa_nest = nla_nest_start_noflag(skb, k++);
3208 if (!rxsa_nest) {
3209 nla_nest_cancel(skb, rxsa_list);
3210 nla_nest_cancel(skb, rxsc_nest);
3211 nla_nest_cancel(skb, rxsc_list);
3212 goto nla_put_failure;
3213 }
3214
3215 attr = nla_nest_start_noflag(skb,
3216 MACSEC_SA_ATTR_STATS);
3217 if (!attr) {
3218 nla_nest_cancel(skb, rxsa_list);
3219 nla_nest_cancel(skb, rxsc_nest);
3220 nla_nest_cancel(skb, rxsc_list);
3221 goto nla_put_failure;
3222 }
3223 memset(&rx_sa_stats, 0, sizeof(rx_sa_stats));
3224 get_rx_sa_stats(dev, rx_sc, i, rx_sa, &rx_sa_stats);
3225 if (copy_rx_sa_stats(skb, &rx_sa_stats)) {
3226 nla_nest_cancel(skb, attr);
3227 nla_nest_cancel(skb, rxsa_list);
3228 nla_nest_cancel(skb, rxsc_nest);
3229 nla_nest_cancel(skb, rxsc_list);
3230 goto nla_put_failure;
3231 }
3232 nla_nest_end(skb, attr);
3233
3234 if (secy->xpn) {
3235 pn = rx_sa->next_pn;
3236 pn_len = MACSEC_XPN_PN_LEN;
3237 } else {
3238 pn = rx_sa->next_pn_halves.lower;
3239 pn_len = MACSEC_DEFAULT_PN_LEN;
3240 }
3241
3242 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
3243 nla_put(skb, MACSEC_SA_ATTR_PN, pn_len, &pn) ||
3244 nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) ||
3245 (secy->xpn && nla_put_ssci(skb, MACSEC_SA_ATTR_SSCI, rx_sa->ssci)) ||
3246 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
3247 nla_nest_cancel(skb, rxsa_nest);
3248 nla_nest_cancel(skb, rxsc_nest);
3249 nla_nest_cancel(skb, rxsc_list);
3250 goto nla_put_failure;
3251 }
3252 nla_nest_end(skb, rxsa_nest);
3253 }
3254
3255 nla_nest_end(skb, rxsa_list);
3256 nla_nest_end(skb, rxsc_nest);
3257 }
3258
3259 nla_nest_end(skb, rxsc_list);
3260
3261 genlmsg_end(skb, hdr);
3262
3263 return 0;
3264
3265nla_put_failure:
3266 genlmsg_cancel(skb, hdr);
3267 return -EMSGSIZE;
3268}
3269
3270static int macsec_generation = 1; /* protected by RTNL */
3271
3272static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
3273{
3274 struct net *net = sock_net(skb->sk);
3275 struct net_device *dev;
3276 int dev_idx, d;
3277
3278 dev_idx = cb->args[0];
3279
3280 d = 0;
3281 rtnl_lock();
3282
3283 cb->seq = macsec_generation;
3284
3285 for_each_netdev(net, dev) {
3286 struct macsec_secy *secy;
3287
3288 if (d < dev_idx)
3289 goto next;
3290
3291 if (!netif_is_macsec(dev))
3292 goto next;
3293
3294 secy = &macsec_priv(dev)->secy;
3295 if (dump_secy(secy, dev, skb, cb) < 0)
3296 goto done;
3297next:
3298 d++;
3299 }
3300
3301done:
3302 rtnl_unlock();
3303 cb->args[0] = d;
3304 return skb->len;
3305}
3306
3307static const struct genl_small_ops macsec_genl_ops[] = {
3308 {
3309 .cmd = MACSEC_CMD_GET_TXSC,
3310 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3311 .dumpit = macsec_dump_txsc,
3312 },
3313 {
3314 .cmd = MACSEC_CMD_ADD_RXSC,
3315 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3316 .doit = macsec_add_rxsc,
3317 .flags = GENL_ADMIN_PERM,
3318 },
3319 {
3320 .cmd = MACSEC_CMD_DEL_RXSC,
3321 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3322 .doit = macsec_del_rxsc,
3323 .flags = GENL_ADMIN_PERM,
3324 },
3325 {
3326 .cmd = MACSEC_CMD_UPD_RXSC,
3327 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3328 .doit = macsec_upd_rxsc,
3329 .flags = GENL_ADMIN_PERM,
3330 },
3331 {
3332 .cmd = MACSEC_CMD_ADD_TXSA,
3333 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3334 .doit = macsec_add_txsa,
3335 .flags = GENL_ADMIN_PERM,
3336 },
3337 {
3338 .cmd = MACSEC_CMD_DEL_TXSA,
3339 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3340 .doit = macsec_del_txsa,
3341 .flags = GENL_ADMIN_PERM,
3342 },
3343 {
3344 .cmd = MACSEC_CMD_UPD_TXSA,
3345 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3346 .doit = macsec_upd_txsa,
3347 .flags = GENL_ADMIN_PERM,
3348 },
3349 {
3350 .cmd = MACSEC_CMD_ADD_RXSA,
3351 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3352 .doit = macsec_add_rxsa,
3353 .flags = GENL_ADMIN_PERM,
3354 },
3355 {
3356 .cmd = MACSEC_CMD_DEL_RXSA,
3357 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3358 .doit = macsec_del_rxsa,
3359 .flags = GENL_ADMIN_PERM,
3360 },
3361 {
3362 .cmd = MACSEC_CMD_UPD_RXSA,
3363 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3364 .doit = macsec_upd_rxsa,
3365 .flags = GENL_ADMIN_PERM,
3366 },
3367 {
3368 .cmd = MACSEC_CMD_UPD_OFFLOAD,
3369 .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
3370 .doit = macsec_upd_offload,
3371 .flags = GENL_ADMIN_PERM,
3372 },
3373};
3374
3375static struct genl_family macsec_fam __ro_after_init = {
3376 .name = MACSEC_GENL_NAME,
3377 .hdrsize = 0,
3378 .version = MACSEC_GENL_VERSION,
3379 .maxattr = MACSEC_ATTR_MAX,
3380 .policy = macsec_genl_policy,
3381 .netnsok = true,
3382 .module = THIS_MODULE,
3383 .small_ops = macsec_genl_ops,
3384 .n_small_ops = ARRAY_SIZE(macsec_genl_ops),
3385 .resv_start_op = MACSEC_CMD_UPD_OFFLOAD + 1,
3386};
3387
3388static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
3389 struct net_device *dev)
3390{
3391 struct macsec_dev *macsec = netdev_priv(dev);
3392 struct macsec_secy *secy = &macsec->secy;
3393 struct pcpu_secy_stats *secy_stats;
3394 int ret, len;
3395
3396 if (macsec_is_offloaded(netdev_priv(dev))) {
3397 struct metadata_dst *md_dst = secy->tx_sc.md_dst;
3398
3399 skb_dst_drop(skb);
3400 dst_hold(&md_dst->dst);
3401 skb_dst_set(skb, &md_dst->dst);
3402 skb->dev = macsec->real_dev;
3403 return dev_queue_xmit(skb);
3404 }
3405
3406 /* 10.5 */
3407 if (!secy->protect_frames) {
3408 secy_stats = this_cpu_ptr(macsec->stats);
3409 u64_stats_update_begin(&secy_stats->syncp);
3410 secy_stats->stats.OutPktsUntagged++;
3411 u64_stats_update_end(&secy_stats->syncp);
3412 skb->dev = macsec->real_dev;
3413 len = skb->len;
3414 ret = dev_queue_xmit(skb);
3415 count_tx(dev, ret, len);
3416 return ret;
3417 }
3418
3419 if (!secy->operational) {
3420 kfree_skb(skb);
3421 dev->stats.tx_dropped++;
3422 return NETDEV_TX_OK;
3423 }
3424
3425 len = skb->len;
3426 skb = macsec_encrypt(skb, dev);
3427 if (IS_ERR(skb)) {
3428 if (PTR_ERR(skb) != -EINPROGRESS)
3429 dev->stats.tx_dropped++;
3430 return NETDEV_TX_OK;
3431 }
3432
3433 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
3434
3435 macsec_encrypt_finish(skb, dev);
3436 ret = dev_queue_xmit(skb);
3437 count_tx(dev, ret, len);
3438 return ret;
3439}
3440
3441#define MACSEC_FEATURES \
3442 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
3443
3444static int macsec_dev_init(struct net_device *dev)
3445{
3446 struct macsec_dev *macsec = macsec_priv(dev);
3447 struct net_device *real_dev = macsec->real_dev;
3448 int err;
3449
3450 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
3451 if (!dev->tstats)
3452 return -ENOMEM;
3453
3454 err = gro_cells_init(&macsec->gro_cells, dev);
3455 if (err) {
3456 free_percpu(dev->tstats);
3457 return err;
3458 }
3459
3460 dev->features = real_dev->features & MACSEC_FEATURES;
3461 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
3462
3463 dev->needed_headroom = real_dev->needed_headroom +
3464 MACSEC_NEEDED_HEADROOM;
3465 dev->needed_tailroom = real_dev->needed_tailroom +
3466 MACSEC_NEEDED_TAILROOM;
3467
3468 if (is_zero_ether_addr(dev->dev_addr))
3469 eth_hw_addr_inherit(dev, real_dev);
3470 if (is_zero_ether_addr(dev->broadcast))
3471 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
3472
3473 /* Get macsec's reference to real_dev */
3474 netdev_hold(real_dev, &macsec->dev_tracker, GFP_KERNEL);
3475
3476 return 0;
3477}
3478
3479static void macsec_dev_uninit(struct net_device *dev)
3480{
3481 struct macsec_dev *macsec = macsec_priv(dev);
3482
3483 gro_cells_destroy(&macsec->gro_cells);
3484 free_percpu(dev->tstats);
3485}
3486
3487static netdev_features_t macsec_fix_features(struct net_device *dev,
3488 netdev_features_t features)
3489{
3490 struct macsec_dev *macsec = macsec_priv(dev);
3491 struct net_device *real_dev = macsec->real_dev;
3492
3493 features &= (real_dev->features & MACSEC_FEATURES) |
3494 NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
3495 features |= NETIF_F_LLTX;
3496
3497 return features;
3498}
3499
3500static int macsec_dev_open(struct net_device *dev)
3501{
3502 struct macsec_dev *macsec = macsec_priv(dev);
3503 struct net_device *real_dev = macsec->real_dev;
3504 int err;
3505
3506 err = dev_uc_add(real_dev, dev->dev_addr);
3507 if (err < 0)
3508 return err;
3509
3510 if (dev->flags & IFF_ALLMULTI) {
3511 err = dev_set_allmulti(real_dev, 1);
3512 if (err < 0)
3513 goto del_unicast;
3514 }
3515
3516 if (dev->flags & IFF_PROMISC) {
3517 err = dev_set_promiscuity(real_dev, 1);
3518 if (err < 0)
3519 goto clear_allmulti;
3520 }
3521
3522 /* If h/w offloading is available, propagate to the device */
3523 if (macsec_is_offloaded(macsec)) {
3524 const struct macsec_ops *ops;
3525 struct macsec_context ctx;
3526
3527 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3528 if (!ops) {
3529 err = -EOPNOTSUPP;
3530 goto clear_allmulti;
3531 }
3532
3533 ctx.secy = &macsec->secy;
3534 err = macsec_offload(ops->mdo_dev_open, &ctx);
3535 if (err)
3536 goto clear_allmulti;
3537 }
3538
3539 if (netif_carrier_ok(real_dev))
3540 netif_carrier_on(dev);
3541
3542 return 0;
3543clear_allmulti:
3544 if (dev->flags & IFF_ALLMULTI)
3545 dev_set_allmulti(real_dev, -1);
3546del_unicast:
3547 dev_uc_del(real_dev, dev->dev_addr);
3548 netif_carrier_off(dev);
3549 return err;
3550}
3551
3552static int macsec_dev_stop(struct net_device *dev)
3553{
3554 struct macsec_dev *macsec = macsec_priv(dev);
3555 struct net_device *real_dev = macsec->real_dev;
3556
3557 netif_carrier_off(dev);
3558
3559 /* If h/w offloading is available, propagate to the device */
3560 if (macsec_is_offloaded(macsec)) {
3561 const struct macsec_ops *ops;
3562 struct macsec_context ctx;
3563
3564 ops = macsec_get_ops(macsec, &ctx);
3565 if (ops) {
3566 ctx.secy = &macsec->secy;
3567 macsec_offload(ops->mdo_dev_stop, &ctx);
3568 }
3569 }
3570
3571 dev_mc_unsync(real_dev, dev);
3572 dev_uc_unsync(real_dev, dev);
3573
3574 if (dev->flags & IFF_ALLMULTI)
3575 dev_set_allmulti(real_dev, -1);
3576
3577 if (dev->flags & IFF_PROMISC)
3578 dev_set_promiscuity(real_dev, -1);
3579
3580 dev_uc_del(real_dev, dev->dev_addr);
3581
3582 return 0;
3583}
3584
3585static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
3586{
3587 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3588
3589 if (!(dev->flags & IFF_UP))
3590 return;
3591
3592 if (change & IFF_ALLMULTI)
3593 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
3594
3595 if (change & IFF_PROMISC)
3596 dev_set_promiscuity(real_dev,
3597 dev->flags & IFF_PROMISC ? 1 : -1);
3598}
3599
3600static void macsec_dev_set_rx_mode(struct net_device *dev)
3601{
3602 struct net_device *real_dev = macsec_priv(dev)->real_dev;
3603
3604 dev_mc_sync(real_dev, dev);
3605 dev_uc_sync(real_dev, dev);
3606}
3607
3608static int macsec_set_mac_address(struct net_device *dev, void *p)
3609{
3610 struct macsec_dev *macsec = macsec_priv(dev);
3611 struct net_device *real_dev = macsec->real_dev;
3612 struct sockaddr *addr = p;
3613 int err;
3614
3615 if (!is_valid_ether_addr(addr->sa_data))
3616 return -EADDRNOTAVAIL;
3617
3618 if (!(dev->flags & IFF_UP))
3619 goto out;
3620
3621 err = dev_uc_add(real_dev, addr->sa_data);
3622 if (err < 0)
3623 return err;
3624
3625 dev_uc_del(real_dev, dev->dev_addr);
3626
3627out:
3628 eth_hw_addr_set(dev, addr->sa_data);
3629
3630 /* If h/w offloading is available, propagate to the device */
3631 if (macsec_is_offloaded(macsec)) {
3632 const struct macsec_ops *ops;
3633 struct macsec_context ctx;
3634
3635 ops = macsec_get_ops(macsec, &ctx);
3636 if (ops) {
3637 ctx.secy = &macsec->secy;
3638 macsec_offload(ops->mdo_upd_secy, &ctx);
3639 }
3640 }
3641
3642 return 0;
3643}
3644
3645static int macsec_change_mtu(struct net_device *dev, int new_mtu)
3646{
3647 struct macsec_dev *macsec = macsec_priv(dev);
3648 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
3649
3650 if (macsec->real_dev->mtu - extra < new_mtu)
3651 return -ERANGE;
3652
3653 dev->mtu = new_mtu;
3654
3655 return 0;
3656}
3657
3658static void macsec_get_stats64(struct net_device *dev,
3659 struct rtnl_link_stats64 *s)
3660{
3661 if (!dev->tstats)
3662 return;
3663
3664 dev_fetch_sw_netstats(s, dev->tstats);
3665
3666 s->rx_dropped = dev->stats.rx_dropped;
3667 s->tx_dropped = dev->stats.tx_dropped;
3668 s->rx_errors = dev->stats.rx_errors;
3669}
3670
3671static int macsec_get_iflink(const struct net_device *dev)
3672{
3673 return macsec_priv(dev)->real_dev->ifindex;
3674}
3675
3676static const struct net_device_ops macsec_netdev_ops = {
3677 .ndo_init = macsec_dev_init,
3678 .ndo_uninit = macsec_dev_uninit,
3679 .ndo_open = macsec_dev_open,
3680 .ndo_stop = macsec_dev_stop,
3681 .ndo_fix_features = macsec_fix_features,
3682 .ndo_change_mtu = macsec_change_mtu,
3683 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
3684 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
3685 .ndo_set_mac_address = macsec_set_mac_address,
3686 .ndo_start_xmit = macsec_start_xmit,
3687 .ndo_get_stats64 = macsec_get_stats64,
3688 .ndo_get_iflink = macsec_get_iflink,
3689};
3690
3691static const struct device_type macsec_type = {
3692 .name = "macsec",
3693};
3694
3695static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
3696 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
3697 [IFLA_MACSEC_PORT] = { .type = NLA_U16 },
3698 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
3699 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
3700 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
3701 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
3702 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
3703 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
3704 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
3705 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
3706 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
3707 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
3708 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
3709 [IFLA_MACSEC_OFFLOAD] = { .type = NLA_U8 },
3710};
3711
3712static void macsec_free_netdev(struct net_device *dev)
3713{
3714 struct macsec_dev *macsec = macsec_priv(dev);
3715
3716 if (macsec->secy.tx_sc.md_dst)
3717 metadata_dst_free(macsec->secy.tx_sc.md_dst);
3718 free_percpu(macsec->stats);
3719 free_percpu(macsec->secy.tx_sc.stats);
3720
3721 /* Get rid of the macsec's reference to real_dev */
3722 netdev_put(macsec->real_dev, &macsec->dev_tracker);
3723}
3724
3725static void macsec_setup(struct net_device *dev)
3726{
3727 ether_setup(dev);
3728 dev->min_mtu = 0;
3729 dev->max_mtu = ETH_MAX_MTU;
3730 dev->priv_flags |= IFF_NO_QUEUE;
3731 dev->netdev_ops = &macsec_netdev_ops;
3732 dev->needs_free_netdev = true;
3733 dev->priv_destructor = macsec_free_netdev;
3734 SET_NETDEV_DEVTYPE(dev, &macsec_type);
3735
3736 eth_zero_addr(dev->broadcast);
3737}
3738
3739static int macsec_changelink_common(struct net_device *dev,
3740 struct nlattr *data[])
3741{
3742 struct macsec_secy *secy;
3743 struct macsec_tx_sc *tx_sc;
3744
3745 secy = &macsec_priv(dev)->secy;
3746 tx_sc = &secy->tx_sc;
3747
3748 if (data[IFLA_MACSEC_ENCODING_SA]) {
3749 struct macsec_tx_sa *tx_sa;
3750
3751 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
3752 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
3753
3754 secy->operational = tx_sa && tx_sa->active;
3755 }
3756
3757 if (data[IFLA_MACSEC_ENCRYPT])
3758 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
3759
3760 if (data[IFLA_MACSEC_PROTECT])
3761 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
3762
3763 if (data[IFLA_MACSEC_INC_SCI])
3764 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
3765
3766 if (data[IFLA_MACSEC_ES])
3767 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
3768
3769 if (data[IFLA_MACSEC_SCB])
3770 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
3771
3772 if (data[IFLA_MACSEC_REPLAY_PROTECT])
3773 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
3774
3775 if (data[IFLA_MACSEC_VALIDATION])
3776 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
3777
3778 if (data[IFLA_MACSEC_CIPHER_SUITE]) {
3779 switch (nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE])) {
3780 case MACSEC_CIPHER_ID_GCM_AES_128:
3781 case MACSEC_DEFAULT_CIPHER_ID:
3782 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3783 secy->xpn = false;
3784 break;
3785 case MACSEC_CIPHER_ID_GCM_AES_256:
3786 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3787 secy->xpn = false;
3788 break;
3789 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
3790 secy->key_len = MACSEC_GCM_AES_128_SAK_LEN;
3791 secy->xpn = true;
3792 break;
3793 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
3794 secy->key_len = MACSEC_GCM_AES_256_SAK_LEN;
3795 secy->xpn = true;
3796 break;
3797 default:
3798 return -EINVAL;
3799 }
3800 }
3801
3802 if (data[IFLA_MACSEC_WINDOW]) {
3803 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
3804
3805 /* IEEE 802.1AEbw-2013 10.7.8 - maximum replay window
3806 * for XPN cipher suites */
3807 if (secy->xpn &&
3808 secy->replay_window > MACSEC_XPN_MAX_REPLAY_WINDOW)
3809 return -EINVAL;
3810 }
3811
3812 return 0;
3813}
3814
3815static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
3816 struct nlattr *data[],
3817 struct netlink_ext_ack *extack)
3818{
3819 struct macsec_dev *macsec = macsec_priv(dev);
3820 struct macsec_tx_sc tx_sc;
3821 struct macsec_secy secy;
3822 int ret;
3823
3824 if (!data)
3825 return 0;
3826
3827 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
3828 data[IFLA_MACSEC_ICV_LEN] ||
3829 data[IFLA_MACSEC_SCI] ||
3830 data[IFLA_MACSEC_PORT])
3831 return -EINVAL;
3832
3833 /* Keep a copy of unmodified secy and tx_sc, in case the offload
3834 * propagation fails, to revert macsec_changelink_common.
3835 */
3836 memcpy(&secy, &macsec->secy, sizeof(secy));
3837 memcpy(&tx_sc, &macsec->secy.tx_sc, sizeof(tx_sc));
3838
3839 ret = macsec_changelink_common(dev, data);
3840 if (ret)
3841 goto cleanup;
3842
3843 /* If h/w offloading is available, propagate to the device */
3844 if (macsec_is_offloaded(macsec)) {
3845 const struct macsec_ops *ops;
3846 struct macsec_context ctx;
3847
3848 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3849 if (!ops) {
3850 ret = -EOPNOTSUPP;
3851 goto cleanup;
3852 }
3853
3854 ctx.secy = &macsec->secy;
3855 ret = macsec_offload(ops->mdo_upd_secy, &ctx);
3856 if (ret)
3857 goto cleanup;
3858 }
3859
3860 return 0;
3861
3862cleanup:
3863 memcpy(&macsec->secy.tx_sc, &tx_sc, sizeof(tx_sc));
3864 memcpy(&macsec->secy, &secy, sizeof(secy));
3865
3866 return ret;
3867}
3868
3869static void macsec_del_dev(struct macsec_dev *macsec)
3870{
3871 int i;
3872
3873 while (macsec->secy.rx_sc) {
3874 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
3875
3876 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
3877 free_rx_sc(rx_sc);
3878 }
3879
3880 for (i = 0; i < MACSEC_NUM_AN; i++) {
3881 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
3882
3883 if (sa) {
3884 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
3885 clear_tx_sa(sa);
3886 }
3887 }
3888}
3889
3890static void macsec_common_dellink(struct net_device *dev, struct list_head *head)
3891{
3892 struct macsec_dev *macsec = macsec_priv(dev);
3893 struct net_device *real_dev = macsec->real_dev;
3894
3895 /* If h/w offloading is available, propagate to the device */
3896 if (macsec_is_offloaded(macsec)) {
3897 const struct macsec_ops *ops;
3898 struct macsec_context ctx;
3899
3900 ops = macsec_get_ops(netdev_priv(dev), &ctx);
3901 if (ops) {
3902 ctx.secy = &macsec->secy;
3903 macsec_offload(ops->mdo_del_secy, &ctx);
3904 }
3905 }
3906
3907 unregister_netdevice_queue(dev, head);
3908 list_del_rcu(&macsec->secys);
3909 macsec_del_dev(macsec);
3910 netdev_upper_dev_unlink(real_dev, dev);
3911
3912 macsec_generation++;
3913}
3914
3915static void macsec_dellink(struct net_device *dev, struct list_head *head)
3916{
3917 struct macsec_dev *macsec = macsec_priv(dev);
3918 struct net_device *real_dev = macsec->real_dev;
3919 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3920
3921 macsec_common_dellink(dev, head);
3922
3923 if (list_empty(&rxd->secys)) {
3924 netdev_rx_handler_unregister(real_dev);
3925 kfree(rxd);
3926 }
3927}
3928
3929static int register_macsec_dev(struct net_device *real_dev,
3930 struct net_device *dev)
3931{
3932 struct macsec_dev *macsec = macsec_priv(dev);
3933 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
3934
3935 if (!rxd) {
3936 int err;
3937
3938 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
3939 if (!rxd)
3940 return -ENOMEM;
3941
3942 INIT_LIST_HEAD(&rxd->secys);
3943
3944 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
3945 rxd);
3946 if (err < 0) {
3947 kfree(rxd);
3948 return err;
3949 }
3950 }
3951
3952 list_add_tail_rcu(&macsec->secys, &rxd->secys);
3953 return 0;
3954}
3955
3956static bool sci_exists(struct net_device *dev, sci_t sci)
3957{
3958 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
3959 struct macsec_dev *macsec;
3960
3961 list_for_each_entry(macsec, &rxd->secys, secys) {
3962 if (macsec->secy.sci == sci)
3963 return true;
3964 }
3965
3966 return false;
3967}
3968
3969static sci_t dev_to_sci(struct net_device *dev, __be16 port)
3970{
3971 return make_sci(dev->dev_addr, port);
3972}
3973
3974static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
3975{
3976 struct macsec_dev *macsec = macsec_priv(dev);
3977 struct macsec_secy *secy = &macsec->secy;
3978
3979 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
3980 if (!macsec->stats)
3981 return -ENOMEM;
3982
3983 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
3984 if (!secy->tx_sc.stats) {
3985 free_percpu(macsec->stats);
3986 return -ENOMEM;
3987 }
3988
3989 secy->tx_sc.md_dst = metadata_dst_alloc(0, METADATA_MACSEC, GFP_KERNEL);
3990 if (!secy->tx_sc.md_dst) {
3991 free_percpu(secy->tx_sc.stats);
3992 free_percpu(macsec->stats);
3993 return -ENOMEM;
3994 }
3995
3996 if (sci == MACSEC_UNDEF_SCI)
3997 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3998
3999 secy->netdev = dev;
4000 secy->operational = true;
4001 secy->key_len = DEFAULT_SAK_LEN;
4002 secy->icv_len = icv_len;
4003 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
4004 secy->protect_frames = true;
4005 secy->replay_protect = false;
4006 secy->xpn = DEFAULT_XPN;
4007
4008 secy->sci = sci;
4009 secy->tx_sc.md_dst->u.macsec_info.sci = sci;
4010 secy->tx_sc.active = true;
4011 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
4012 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
4013 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
4014 secy->tx_sc.end_station = false;
4015 secy->tx_sc.scb = false;
4016
4017 return 0;
4018}
4019
4020static struct lock_class_key macsec_netdev_addr_lock_key;
4021
4022static int macsec_newlink(struct net *net, struct net_device *dev,
4023 struct nlattr *tb[], struct nlattr *data[],
4024 struct netlink_ext_ack *extack)
4025{
4026 struct macsec_dev *macsec = macsec_priv(dev);
4027 rx_handler_func_t *rx_handler;
4028 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4029 struct net_device *real_dev;
4030 int err, mtu;
4031 sci_t sci;
4032
4033 if (!tb[IFLA_LINK])
4034 return -EINVAL;
4035 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
4036 if (!real_dev)
4037 return -ENODEV;
4038 if (real_dev->type != ARPHRD_ETHER)
4039 return -EINVAL;
4040
4041 dev->priv_flags |= IFF_MACSEC;
4042
4043 macsec->real_dev = real_dev;
4044
4045 if (data && data[IFLA_MACSEC_OFFLOAD])
4046 macsec->offload = nla_get_offload(data[IFLA_MACSEC_OFFLOAD]);
4047 else
4048 /* MACsec offloading is off by default */
4049 macsec->offload = MACSEC_OFFLOAD_OFF;
4050
4051 /* Check if the offloading mode is supported by the underlying layers */
4052 if (macsec->offload != MACSEC_OFFLOAD_OFF &&
4053 !macsec_check_offload(macsec->offload, macsec))
4054 return -EOPNOTSUPP;
4055
4056 /* send_sci must be set to true when transmit sci explicitly is set */
4057 if ((data && data[IFLA_MACSEC_SCI]) &&
4058 (data && data[IFLA_MACSEC_INC_SCI])) {
4059 u8 send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
4060
4061 if (!send_sci)
4062 return -EINVAL;
4063 }
4064
4065 if (data && data[IFLA_MACSEC_ICV_LEN])
4066 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4067 mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
4068 if (mtu < 0)
4069 dev->mtu = 0;
4070 else
4071 dev->mtu = mtu;
4072
4073 rx_handler = rtnl_dereference(real_dev->rx_handler);
4074 if (rx_handler && rx_handler != macsec_handle_frame)
4075 return -EBUSY;
4076
4077 err = register_netdevice(dev);
4078 if (err < 0)
4079 return err;
4080
4081 netdev_lockdep_set_classes(dev);
4082 lockdep_set_class(&dev->addr_list_lock,
4083 &macsec_netdev_addr_lock_key);
4084
4085 err = netdev_upper_dev_link(real_dev, dev, extack);
4086 if (err < 0)
4087 goto unregister;
4088
4089 /* need to be already registered so that ->init has run and
4090 * the MAC addr is set
4091 */
4092 if (data && data[IFLA_MACSEC_SCI])
4093 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
4094 else if (data && data[IFLA_MACSEC_PORT])
4095 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
4096 else
4097 sci = dev_to_sci(dev, MACSEC_PORT_ES);
4098
4099 if (rx_handler && sci_exists(real_dev, sci)) {
4100 err = -EBUSY;
4101 goto unlink;
4102 }
4103
4104 err = macsec_add_dev(dev, sci, icv_len);
4105 if (err)
4106 goto unlink;
4107
4108 if (data) {
4109 err = macsec_changelink_common(dev, data);
4110 if (err)
4111 goto del_dev;
4112 }
4113
4114 /* If h/w offloading is available, propagate to the device */
4115 if (macsec_is_offloaded(macsec)) {
4116 const struct macsec_ops *ops;
4117 struct macsec_context ctx;
4118
4119 ops = macsec_get_ops(macsec, &ctx);
4120 if (ops) {
4121 ctx.secy = &macsec->secy;
4122 err = macsec_offload(ops->mdo_add_secy, &ctx);
4123 if (err)
4124 goto del_dev;
4125 }
4126 }
4127
4128 err = register_macsec_dev(real_dev, dev);
4129 if (err < 0)
4130 goto del_dev;
4131
4132 netif_stacked_transfer_operstate(real_dev, dev);
4133 linkwatch_fire_event(dev);
4134
4135 macsec_generation++;
4136
4137 return 0;
4138
4139del_dev:
4140 macsec_del_dev(macsec);
4141unlink:
4142 netdev_upper_dev_unlink(real_dev, dev);
4143unregister:
4144 unregister_netdevice(dev);
4145 return err;
4146}
4147
4148static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[],
4149 struct netlink_ext_ack *extack)
4150{
4151 u64 csid = MACSEC_DEFAULT_CIPHER_ID;
4152 u8 icv_len = MACSEC_DEFAULT_ICV_LEN;
4153 int flag;
4154 bool es, scb, sci;
4155
4156 if (!data)
4157 return 0;
4158
4159 if (data[IFLA_MACSEC_CIPHER_SUITE])
4160 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
4161
4162 if (data[IFLA_MACSEC_ICV_LEN]) {
4163 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
4164 if (icv_len != MACSEC_DEFAULT_ICV_LEN) {
4165 char dummy_key[DEFAULT_SAK_LEN] = { 0 };
4166 struct crypto_aead *dummy_tfm;
4167
4168 dummy_tfm = macsec_alloc_tfm(dummy_key,
4169 DEFAULT_SAK_LEN,
4170 icv_len);
4171 if (IS_ERR(dummy_tfm))
4172 return PTR_ERR(dummy_tfm);
4173 crypto_free_aead(dummy_tfm);
4174 }
4175 }
4176
4177 switch (csid) {
4178 case MACSEC_CIPHER_ID_GCM_AES_128:
4179 case MACSEC_CIPHER_ID_GCM_AES_256:
4180 case MACSEC_CIPHER_ID_GCM_AES_XPN_128:
4181 case MACSEC_CIPHER_ID_GCM_AES_XPN_256:
4182 case MACSEC_DEFAULT_CIPHER_ID:
4183 if (icv_len < MACSEC_MIN_ICV_LEN ||
4184 icv_len > MACSEC_STD_ICV_LEN)
4185 return -EINVAL;
4186 break;
4187 default:
4188 return -EINVAL;
4189 }
4190
4191 if (data[IFLA_MACSEC_ENCODING_SA]) {
4192 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
4193 return -EINVAL;
4194 }
4195
4196 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
4197 flag < IFLA_MACSEC_VALIDATION;
4198 flag++) {
4199 if (data[flag]) {
4200 if (nla_get_u8(data[flag]) > 1)
4201 return -EINVAL;
4202 }
4203 }
4204
4205 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
4206 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
4207 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
4208
4209 if ((sci && (scb || es)) || (scb && es))
4210 return -EINVAL;
4211
4212 if (data[IFLA_MACSEC_VALIDATION] &&
4213 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
4214 return -EINVAL;
4215
4216 if ((data[IFLA_MACSEC_REPLAY_PROTECT] &&
4217 nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) &&
4218 !data[IFLA_MACSEC_WINDOW])
4219 return -EINVAL;
4220
4221 return 0;
4222}
4223
4224static struct net *macsec_get_link_net(const struct net_device *dev)
4225{
4226 return dev_net(macsec_priv(dev)->real_dev);
4227}
4228
4229static size_t macsec_get_size(const struct net_device *dev)
4230{
4231 return nla_total_size_64bit(8) + /* IFLA_MACSEC_SCI */
4232 nla_total_size(1) + /* IFLA_MACSEC_ICV_LEN */
4233 nla_total_size_64bit(8) + /* IFLA_MACSEC_CIPHER_SUITE */
4234 nla_total_size(4) + /* IFLA_MACSEC_WINDOW */
4235 nla_total_size(1) + /* IFLA_MACSEC_ENCODING_SA */
4236 nla_total_size(1) + /* IFLA_MACSEC_ENCRYPT */
4237 nla_total_size(1) + /* IFLA_MACSEC_PROTECT */
4238 nla_total_size(1) + /* IFLA_MACSEC_INC_SCI */
4239 nla_total_size(1) + /* IFLA_MACSEC_ES */
4240 nla_total_size(1) + /* IFLA_MACSEC_SCB */
4241 nla_total_size(1) + /* IFLA_MACSEC_REPLAY_PROTECT */
4242 nla_total_size(1) + /* IFLA_MACSEC_VALIDATION */
4243 0;
4244}
4245
4246static int macsec_fill_info(struct sk_buff *skb,
4247 const struct net_device *dev)
4248{
4249 struct macsec_secy *secy = &macsec_priv(dev)->secy;
4250 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
4251 u64 csid;
4252
4253 switch (secy->key_len) {
4254 case MACSEC_GCM_AES_128_SAK_LEN:
4255 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_128 : MACSEC_DEFAULT_CIPHER_ID;
4256 break;
4257 case MACSEC_GCM_AES_256_SAK_LEN:
4258 csid = secy->xpn ? MACSEC_CIPHER_ID_GCM_AES_XPN_256 : MACSEC_CIPHER_ID_GCM_AES_256;
4259 break;
4260 default:
4261 goto nla_put_failure;
4262 }
4263
4264 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci,
4265 IFLA_MACSEC_PAD) ||
4266 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
4267 nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE,
4268 csid, IFLA_MACSEC_PAD) ||
4269 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
4270 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
4271 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
4272 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
4273 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
4274 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
4275 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
4276 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
4277 0)
4278 goto nla_put_failure;
4279
4280 if (secy->replay_protect) {
4281 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
4282 goto nla_put_failure;
4283 }
4284
4285 return 0;
4286
4287nla_put_failure:
4288 return -EMSGSIZE;
4289}
4290
4291static struct rtnl_link_ops macsec_link_ops __read_mostly = {
4292 .kind = "macsec",
4293 .priv_size = sizeof(struct macsec_dev),
4294 .maxtype = IFLA_MACSEC_MAX,
4295 .policy = macsec_rtnl_policy,
4296 .setup = macsec_setup,
4297 .validate = macsec_validate_attr,
4298 .newlink = macsec_newlink,
4299 .changelink = macsec_changelink,
4300 .dellink = macsec_dellink,
4301 .get_size = macsec_get_size,
4302 .fill_info = macsec_fill_info,
4303 .get_link_net = macsec_get_link_net,
4304};
4305
4306static bool is_macsec_master(struct net_device *dev)
4307{
4308 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
4309}
4310
4311static int macsec_notify(struct notifier_block *this, unsigned long event,
4312 void *ptr)
4313{
4314 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
4315 LIST_HEAD(head);
4316
4317 if (!is_macsec_master(real_dev))
4318 return NOTIFY_DONE;
4319
4320 switch (event) {
4321 case NETDEV_DOWN:
4322 case NETDEV_UP:
4323 case NETDEV_CHANGE: {
4324 struct macsec_dev *m, *n;
4325 struct macsec_rxh_data *rxd;
4326
4327 rxd = macsec_data_rtnl(real_dev);
4328 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4329 struct net_device *dev = m->secy.netdev;
4330
4331 netif_stacked_transfer_operstate(real_dev, dev);
4332 }
4333 break;
4334 }
4335 case NETDEV_UNREGISTER: {
4336 struct macsec_dev *m, *n;
4337 struct macsec_rxh_data *rxd;
4338
4339 rxd = macsec_data_rtnl(real_dev);
4340 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
4341 macsec_common_dellink(m->secy.netdev, &head);
4342 }
4343
4344 netdev_rx_handler_unregister(real_dev);
4345 kfree(rxd);
4346
4347 unregister_netdevice_many(&head);
4348 break;
4349 }
4350 case NETDEV_CHANGEMTU: {
4351 struct macsec_dev *m;
4352 struct macsec_rxh_data *rxd;
4353
4354 rxd = macsec_data_rtnl(real_dev);
4355 list_for_each_entry(m, &rxd->secys, secys) {
4356 struct net_device *dev = m->secy.netdev;
4357 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
4358 macsec_extra_len(true));
4359
4360 if (dev->mtu > mtu)
4361 dev_set_mtu(dev, mtu);
4362 }
4363 }
4364 }
4365
4366 return NOTIFY_OK;
4367}
4368
4369static struct notifier_block macsec_notifier = {
4370 .notifier_call = macsec_notify,
4371};
4372
4373static int __init macsec_init(void)
4374{
4375 int err;
4376
4377 pr_info("MACsec IEEE 802.1AE\n");
4378 err = register_netdevice_notifier(&macsec_notifier);
4379 if (err)
4380 return err;
4381
4382 err = rtnl_link_register(&macsec_link_ops);
4383 if (err)
4384 goto notifier;
4385
4386 err = genl_register_family(&macsec_fam);
4387 if (err)
4388 goto rtnl;
4389
4390 return 0;
4391
4392rtnl:
4393 rtnl_link_unregister(&macsec_link_ops);
4394notifier:
4395 unregister_netdevice_notifier(&macsec_notifier);
4396 return err;
4397}
4398
4399static void __exit macsec_exit(void)
4400{
4401 genl_unregister_family(&macsec_fam);
4402 rtnl_link_unregister(&macsec_link_ops);
4403 unregister_netdevice_notifier(&macsec_notifier);
4404 rcu_barrier();
4405}
4406
4407module_init(macsec_init);
4408module_exit(macsec_exit);
4409
4410MODULE_ALIAS_RTNL_LINK("macsec");
4411MODULE_ALIAS_GENL_FAMILY("macsec");
4412
4413MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
4414MODULE_LICENSE("GPL v2");