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