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macsec: add consistency check to netlink dumps
[linux-block.git] / drivers / net / macsec.c
CommitLineData
c09440f7
SD		 1/*
2 * drivers/net/macsec.c - MACsec device
3 *
4 * Copyright (c) 2015 Sabrina Dubroca <sd@queasysnail.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <linux/types.h>
13#include <linux/skbuff.h>
14#include <linux/socket.h>
15#include <linux/module.h>
16#include <crypto/aead.h>
17#include <linux/etherdevice.h>
18#include <linux/rtnetlink.h>
19#include <net/genetlink.h>
20#include <net/sock.h>
21
22#include <uapi/linux/if_macsec.h>
23
24typedef u64 __bitwise sci_t;
25
26#define MACSEC_SCI_LEN 8
27
28/* SecTAG length = macsec_eth_header without the optional SCI */
29#define MACSEC_TAG_LEN 6
30
31struct macsec_eth_header {
32 struct ethhdr eth;
33 /* SecTAG */
34 u8 tci_an;
35#if defined(__LITTLE_ENDIAN_BITFIELD)
36 u8 short_length:6,
37 unused:2;
38#elif defined(__BIG_ENDIAN_BITFIELD)
39 u8 unused:2,
40 short_length:6;
41#else
42#error "Please fix <asm/byteorder.h>"
43#endif
44 __be32 packet_number;
45 u8 secure_channel_id[8]; /* optional */
46} __packed;
47
48#define MACSEC_TCI_VERSION 0x80
49#define MACSEC_TCI_ES 0x40 /* end station */
50#define MACSEC_TCI_SC 0x20 /* SCI present */
51#define MACSEC_TCI_SCB 0x10 /* epon */
52#define MACSEC_TCI_E 0x08 /* encryption */
53#define MACSEC_TCI_C 0x04 /* changed text */
54#define MACSEC_AN_MASK 0x03 /* association number */
55#define MACSEC_TCI_CONFID (MACSEC_TCI_E | MACSEC_TCI_C)
56
57/* minimum secure data length deemed "not short", see IEEE 802.1AE-2006 9.7 */
58#define MIN_NON_SHORT_LEN 48
59
60#define GCM_AES_IV_LEN 12
61#define DEFAULT_ICV_LEN 16
62
63#define MACSEC_NUM_AN 4 /* 2 bits for the association number */
64
65#define for_each_rxsc(secy, sc) \
66 for (sc = rcu_dereference_bh(secy->rx_sc); \
67 sc; \
68 sc = rcu_dereference_bh(sc->next))
69#define for_each_rxsc_rtnl(secy, sc) \
70 for (sc = rtnl_dereference(secy->rx_sc); \
71 sc; \
72 sc = rtnl_dereference(sc->next))
73
74struct gcm_iv {
75 union {
76 u8 secure_channel_id[8];
77 sci_t sci;
78 };
79 __be32 pn;
80};
81
82/**
83 * struct macsec_key - SA key
84 * @id: user-provided key identifier
85 * @tfm: crypto struct, key storage
86 */
87struct macsec_key {
88 u64 id;
89 struct crypto_aead *tfm;
90};
91
92struct macsec_rx_sc_stats {
93 __u64 InOctetsValidated;
94 __u64 InOctetsDecrypted;
95 __u64 InPktsUnchecked;
96 __u64 InPktsDelayed;
97 __u64 InPktsOK;
98 __u64 InPktsInvalid;
99 __u64 InPktsLate;
100 __u64 InPktsNotValid;
101 __u64 InPktsNotUsingSA;
102 __u64 InPktsUnusedSA;
103};
104
105struct macsec_rx_sa_stats {
106 __u32 InPktsOK;
107 __u32 InPktsInvalid;
108 __u32 InPktsNotValid;
109 __u32 InPktsNotUsingSA;
110 __u32 InPktsUnusedSA;
111};
112
113struct macsec_tx_sa_stats {
114 __u32 OutPktsProtected;
115 __u32 OutPktsEncrypted;
116};
117
118struct macsec_tx_sc_stats {
119 __u64 OutPktsProtected;
120 __u64 OutPktsEncrypted;
121 __u64 OutOctetsProtected;
122 __u64 OutOctetsEncrypted;
123};
124
125struct macsec_dev_stats {
126 __u64 OutPktsUntagged;
127 __u64 InPktsUntagged;
128 __u64 OutPktsTooLong;
129 __u64 InPktsNoTag;
130 __u64 InPktsBadTag;
131 __u64 InPktsUnknownSCI;
132 __u64 InPktsNoSCI;
133 __u64 InPktsOverrun;
134};
135
136/**
137 * struct macsec_rx_sa - receive secure association
138 * @active:
139 * @next_pn: packet number expected for the next packet
140 * @lock: protects next_pn manipulations
141 * @key: key structure
142 * @stats: per-SA stats
143 */
144struct macsec_rx_sa {
145 struct macsec_key key;
146 spinlock_t lock;
147 u32 next_pn;
148 atomic_t refcnt;
149 bool active;
150 struct macsec_rx_sa_stats __percpu *stats;
151 struct macsec_rx_sc *sc;
152 struct rcu_head rcu;
153};
154
155struct pcpu_rx_sc_stats {
156 struct macsec_rx_sc_stats stats;
157 struct u64_stats_sync syncp;
158};
159
160/**
161 * struct macsec_rx_sc - receive secure channel
162 * @sci: secure channel identifier for this SC
163 * @active: channel is active
164 * @sa: array of secure associations
165 * @stats: per-SC stats
166 */
167struct macsec_rx_sc {
168 struct macsec_rx_sc __rcu *next;
169 sci_t sci;
170 bool active;
171 struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN];
172 struct pcpu_rx_sc_stats __percpu *stats;
173 atomic_t refcnt;
174 struct rcu_head rcu_head;
175};
176
177/**
178 * struct macsec_tx_sa - transmit secure association
179 * @active:
180 * @next_pn: packet number to use for the next packet
181 * @lock: protects next_pn manipulations
182 * @key: key structure
183 * @stats: per-SA stats
184 */
185struct macsec_tx_sa {
186 struct macsec_key key;
187 spinlock_t lock;
188 u32 next_pn;
189 atomic_t refcnt;
190 bool active;
191 struct macsec_tx_sa_stats __percpu *stats;
192 struct rcu_head rcu;
193};
194
195struct pcpu_tx_sc_stats {
196 struct macsec_tx_sc_stats stats;
197 struct u64_stats_sync syncp;
198};
199
200/**
201 * struct macsec_tx_sc - transmit secure channel
202 * @active:
203 * @encoding_sa: association number of the SA currently in use
204 * @encrypt: encrypt packets on transmit, or authenticate only
205 * @send_sci: always include the SCI in the SecTAG
206 * @end_station:
207 * @scb: single copy broadcast flag
208 * @sa: array of secure associations
209 * @stats: stats for this TXSC
210 */
211struct macsec_tx_sc {
212 bool active;
213 u8 encoding_sa;
214 bool encrypt;
215 bool send_sci;
216 bool end_station;
217 bool scb;
218 struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN];
219 struct pcpu_tx_sc_stats __percpu *stats;
220};
221
222#define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT
223
224/**
225 * struct macsec_secy - MACsec Security Entity
226 * @netdev: netdevice for this SecY
227 * @n_rx_sc: number of receive secure channels configured on this SecY
228 * @sci: secure channel identifier used for tx
229 * @key_len: length of keys used by the cipher suite
230 * @icv_len: length of ICV used by the cipher suite
231 * @validate_frames: validation mode
232 * @operational: MAC_Operational flag
233 * @protect_frames: enable protection for this SecY
234 * @replay_protect: enable packet number checks on receive
235 * @replay_window: size of the replay window
236 * @tx_sc: transmit secure channel
237 * @rx_sc: linked list of receive secure channels
238 */
239struct macsec_secy {
240 struct net_device *netdev;
241 unsigned int n_rx_sc;
242 sci_t sci;
243 u16 key_len;
244 u16 icv_len;
245 enum macsec_validation_type validate_frames;
246 bool operational;
247 bool protect_frames;
248 bool replay_protect;
249 u32 replay_window;
250 struct macsec_tx_sc tx_sc;
251 struct macsec_rx_sc __rcu *rx_sc;
252};
253
254struct pcpu_secy_stats {
255 struct macsec_dev_stats stats;
256 struct u64_stats_sync syncp;
257};
258
259/**
260 * struct macsec_dev - private data
261 * @secy: SecY config
262 * @real_dev: pointer to underlying netdevice
263 * @stats: MACsec device stats
264 * @secys: linked list of SecY's on the underlying device
265 */
266struct macsec_dev {
267 struct macsec_secy secy;
268 struct net_device *real_dev;
269 struct pcpu_secy_stats __percpu *stats;
270 struct list_head secys;
271};
272
273/**
274 * struct macsec_rxh_data - rx_handler private argument
275 * @secys: linked list of SecY's on this underlying device
276 */
277struct macsec_rxh_data {
278 struct list_head secys;
279};
280
281static struct macsec_dev *macsec_priv(const struct net_device *dev)
282{
283 return (struct macsec_dev *)netdev_priv(dev);
284}
285
286static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev)
287{
288 return rcu_dereference_bh(dev->rx_handler_data);
289}
290
291static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev)
292{
293 return rtnl_dereference(dev->rx_handler_data);
294}
295
296struct macsec_cb {
297 struct aead_request *req;
298 union {
299 struct macsec_tx_sa *tx_sa;
300 struct macsec_rx_sa *rx_sa;
301 };
302 u8 assoc_num;
303 bool valid;
304 bool has_sci;
305};
306
307static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr)
308{
309 struct macsec_rx_sa *sa = rcu_dereference_bh(ptr);
310
311 if (!sa || !sa->active)
312 return NULL;
313
314 if (!atomic_inc_not_zero(&sa->refcnt))
315 return NULL;
316
317 return sa;
318}
319
320static void free_rx_sc_rcu(struct rcu_head *head)
321{
322 struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head);
323
324 free_percpu(rx_sc->stats);
325 kfree(rx_sc);
326}
327
328static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc)
329{
330 return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL;
331}
332
333static void macsec_rxsc_put(struct macsec_rx_sc *sc)
334{
335 if (atomic_dec_and_test(&sc->refcnt))
336 call_rcu(&sc->rcu_head, free_rx_sc_rcu);
337}
338
339static void free_rxsa(struct rcu_head *head)
340{
341 struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu);
342
343 crypto_free_aead(sa->key.tfm);
344 free_percpu(sa->stats);
345 macsec_rxsc_put(sa->sc);
346 kfree(sa);
347}
348
349static void macsec_rxsa_put(struct macsec_rx_sa *sa)
350{
351 if (atomic_dec_and_test(&sa->refcnt))
352 call_rcu(&sa->rcu, free_rxsa);
353}
354
355static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr)
356{
357 struct macsec_tx_sa *sa = rcu_dereference_bh(ptr);
358
359 if (!sa || !sa->active)
360 return NULL;
361
362 if (!atomic_inc_not_zero(&sa->refcnt))
363 return NULL;
364
365 return sa;
366}
367
368static void free_txsa(struct rcu_head *head)
369{
370 struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu);
371
372 crypto_free_aead(sa->key.tfm);
373 free_percpu(sa->stats);
374 kfree(sa);
375}
376
377static void macsec_txsa_put(struct macsec_tx_sa *sa)
378{
379 if (atomic_dec_and_test(&sa->refcnt))
380 call_rcu(&sa->rcu, free_txsa);
381}
382
383static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb)
384{
385 BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb));
386 return (struct macsec_cb *)skb->cb;
387}
388
389#define MACSEC_PORT_ES (htons(0x0001))
390#define MACSEC_PORT_SCB (0x0000)
391#define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL)
392
393#define DEFAULT_SAK_LEN 16
394#define DEFAULT_SEND_SCI true
395#define DEFAULT_ENCRYPT false
396#define DEFAULT_ENCODING_SA 0
397
398static sci_t make_sci(u8 *addr, __be16 port)
399{
400 sci_t sci;
401
402 memcpy(&sci, addr, ETH_ALEN);
403 memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port));
404
405 return sci;
406}
407
408static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present)
409{
410 sci_t sci;
411
412 if (sci_present)
413 memcpy(&sci, hdr->secure_channel_id,
414 sizeof(hdr->secure_channel_id));
415 else
416 sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES);
417
418 return sci;
419}
420
421static unsigned int macsec_sectag_len(bool sci_present)
422{
423 return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0);
424}
425
426static unsigned int macsec_hdr_len(bool sci_present)
427{
428 return macsec_sectag_len(sci_present) + ETH_HLEN;
429}
430
431static unsigned int macsec_extra_len(bool sci_present)
432{
433 return macsec_sectag_len(sci_present) + sizeof(__be16);
434}
435
436/* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */
437static void macsec_fill_sectag(struct macsec_eth_header *h,
438 const struct macsec_secy *secy, u32 pn)
439{
440 const struct macsec_tx_sc *tx_sc = &secy->tx_sc;
441
442 memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci));
443 h->eth.h_proto = htons(ETH_P_MACSEC);
444
445 if (tx_sc->send_sci ||
446 (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) {
447 h->tci_an |= MACSEC_TCI_SC;
448 memcpy(&h->secure_channel_id, &secy->sci,
449 sizeof(h->secure_channel_id));
450 } else {
451 if (tx_sc->end_station)
452 h->tci_an |= MACSEC_TCI_ES;
453 if (tx_sc->scb)
454 h->tci_an |= MACSEC_TCI_SCB;
455 }
456
457 h->packet_number = htonl(pn);
458
459 /* with GCM, C/E clear for !encrypt, both set for encrypt */
460 if (tx_sc->encrypt)
461 h->tci_an |= MACSEC_TCI_CONFID;
462 else if (secy->icv_len != DEFAULT_ICV_LEN)
463 h->tci_an |= MACSEC_TCI_C;
464
465 h->tci_an |= tx_sc->encoding_sa;
466}
467
468static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len)
469{
470 if (data_len < MIN_NON_SHORT_LEN)
471 h->short_length = data_len;
472}
473
474/* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */
475static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len)
476{
477 struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data;
478 int len = skb->len - 2 * ETH_ALEN;
479 int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len;
480
481 /* a) It comprises at least 17 octets */
482 if (skb->len <= 16)
483 return false;
484
485 /* b) MACsec EtherType: already checked */
486
487 /* c) V bit is clear */
488 if (h->tci_an & MACSEC_TCI_VERSION)
489 return false;
490
491 /* d) ES or SCB => !SC */
492 if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) &&
493 (h->tci_an & MACSEC_TCI_SC))
494 return false;
495
496 /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */
497 if (h->unused)
498 return false;
499
500 /* rx.pn != 0 (figure 10-5) */
501 if (!h->packet_number)
502 return false;
503
504 /* length check, f) g) h) i) */
505 if (h->short_length)
506 return len == extra_len + h->short_length;
507 return len >= extra_len + MIN_NON_SHORT_LEN;
508}
509
510#define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true))
511#define MACSEC_NEEDED_TAILROOM MACSEC_MAX_ICV_LEN
512
513static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn)
514{
515 struct gcm_iv *gcm_iv = (struct gcm_iv *)iv;
516
517 gcm_iv->sci = sci;
518 gcm_iv->pn = htonl(pn);
519}
520
521static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb)
522{
523 return (struct macsec_eth_header *)skb_mac_header(skb);
524}
525
526static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy)
527{
528 u32 pn;
529
530 spin_lock_bh(&tx_sa->lock);
531 pn = tx_sa->next_pn;
532
533 tx_sa->next_pn++;
534 if (tx_sa->next_pn == 0) {
535 pr_debug("PN wrapped, transitioning to !oper\n");
536 tx_sa->active = false;
537 if (secy->protect_frames)
538 secy->operational = false;
539 }
540 spin_unlock_bh(&tx_sa->lock);
541
542 return pn;
543}
544
545static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev)
546{
547 struct macsec_dev *macsec = netdev_priv(dev);
548
549 skb->dev = macsec->real_dev;
550 skb_reset_mac_header(skb);
551 skb->protocol = eth_hdr(skb)->h_proto;
552}
553
554static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc,
555 struct macsec_tx_sa *tx_sa)
556{
557 struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats);
558
559 u64_stats_update_begin(&txsc_stats->syncp);
560 if (tx_sc->encrypt) {
561 txsc_stats->stats.OutOctetsEncrypted += skb->len;
562 txsc_stats->stats.OutPktsEncrypted++;
563 this_cpu_inc(tx_sa->stats->OutPktsEncrypted);
564 } else {
565 txsc_stats->stats.OutOctetsProtected += skb->len;
566 txsc_stats->stats.OutPktsProtected++;
567 this_cpu_inc(tx_sa->stats->OutPktsProtected);
568 }
569 u64_stats_update_end(&txsc_stats->syncp);
570}
571
572static void count_tx(struct net_device *dev, int ret, int len)
573{
574 if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) {
575 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
576
577 u64_stats_update_begin(&stats->syncp);
578 stats->tx_packets++;
579 stats->tx_bytes += len;
580 u64_stats_update_end(&stats->syncp);
581 } else {
582 dev->stats.tx_dropped++;
583 }
584}
585
586static void macsec_encrypt_done(struct crypto_async_request *base, int err)
587{
588 struct sk_buff *skb = base->data;
589 struct net_device *dev = skb->dev;
590 struct macsec_dev *macsec = macsec_priv(dev);
591 struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa;
592 int len, ret;
593
594 aead_request_free(macsec_skb_cb(skb)->req);
595
596 rcu_read_lock_bh();
597 macsec_encrypt_finish(skb, dev);
598 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
599 len = skb->len;
600 ret = dev_queue_xmit(skb);
601 count_tx(dev, ret, len);
602 rcu_read_unlock_bh();
603
604 macsec_txsa_put(sa);
605 dev_put(dev);
606}
607
608static struct sk_buff *macsec_encrypt(struct sk_buff *skb,
609 struct net_device *dev)
610{
611 int ret;
612 struct scatterlist sg[MAX_SKB_FRAGS + 1];
613 unsigned char iv[GCM_AES_IV_LEN];
614 struct ethhdr *eth;
615 struct macsec_eth_header *hh;
616 size_t unprotected_len;
617 struct aead_request *req;
618 struct macsec_secy *secy;
619 struct macsec_tx_sc *tx_sc;
620 struct macsec_tx_sa *tx_sa;
621 struct macsec_dev *macsec = macsec_priv(dev);
622 u32 pn;
623
624 secy = &macsec->secy;
625 tx_sc = &secy->tx_sc;
626
627 /* 10.5.1 TX SA assignment */
628 tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]);
629 if (!tx_sa) {
630 secy->operational = false;
631 kfree_skb(skb);
632 return ERR_PTR(-EINVAL);
633 }
634
635 if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM ||
636 skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) {
637 struct sk_buff *nskb = skb_copy_expand(skb,
638 MACSEC_NEEDED_HEADROOM,
639 MACSEC_NEEDED_TAILROOM,
640 GFP_ATOMIC);
641 if (likely(nskb)) {
642 consume_skb(skb);
643 skb = nskb;
644 } else {
645 macsec_txsa_put(tx_sa);
646 kfree_skb(skb);
647 return ERR_PTR(-ENOMEM);
648 }
649 } else {
650 skb = skb_unshare(skb, GFP_ATOMIC);
651 if (!skb) {
652 macsec_txsa_put(tx_sa);
653 return ERR_PTR(-ENOMEM);
654 }
655 }
656
657 unprotected_len = skb->len;
658 eth = eth_hdr(skb);
659 hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci));
660 memmove(hh, eth, 2 * ETH_ALEN);
661
662 pn = tx_sa_update_pn(tx_sa, secy);
663 if (pn == 0) {
664 macsec_txsa_put(tx_sa);
665 kfree_skb(skb);
666 return ERR_PTR(-ENOLINK);
667 }
668 macsec_fill_sectag(hh, secy, pn);
669 macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN);
670
671 macsec_fill_iv(iv, secy->sci, pn);
672
673 skb_put(skb, secy->icv_len);
674
675 if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) {
676 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
677
678 u64_stats_update_begin(&secy_stats->syncp);
679 secy_stats->stats.OutPktsTooLong++;
680 u64_stats_update_end(&secy_stats->syncp);
681
682 macsec_txsa_put(tx_sa);
683 kfree_skb(skb);
684 return ERR_PTR(-EINVAL);
685 }
686
687 req = aead_request_alloc(tx_sa->key.tfm, GFP_ATOMIC);
688 if (!req) {
689 macsec_txsa_put(tx_sa);
690 kfree_skb(skb);
691 return ERR_PTR(-ENOMEM);
692 }
693
694 sg_init_table(sg, MAX_SKB_FRAGS + 1);
695 skb_to_sgvec(skb, sg, 0, skb->len);
696
697 if (tx_sc->encrypt) {
698 int len = skb->len - macsec_hdr_len(tx_sc->send_sci) -
699 secy->icv_len;
700 aead_request_set_crypt(req, sg, sg, len, iv);
701 aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci));
702 } else {
703 aead_request_set_crypt(req, sg, sg, 0, iv);
704 aead_request_set_ad(req, skb->len - secy->icv_len);
705 }
706
707 macsec_skb_cb(skb)->req = req;
708 macsec_skb_cb(skb)->tx_sa = tx_sa;
709 aead_request_set_callback(req, 0, macsec_encrypt_done, skb);
710
711 dev_hold(skb->dev);
712 ret = crypto_aead_encrypt(req);
713 if (ret == -EINPROGRESS) {
714 return ERR_PTR(ret);
715 } else if (ret != 0) {
716 dev_put(skb->dev);
717 kfree_skb(skb);
718 aead_request_free(req);
719 macsec_txsa_put(tx_sa);
720 return ERR_PTR(-EINVAL);
721 }
722
723 dev_put(skb->dev);
724 aead_request_free(req);
725 macsec_txsa_put(tx_sa);
726
727 return skb;
728}
729
730static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn)
731{
732 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
733 struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats);
734 struct macsec_eth_header *hdr = macsec_ethhdr(skb);
735 u32 lowest_pn = 0;
736
737 spin_lock(&rx_sa->lock);
738 if (rx_sa->next_pn >= secy->replay_window)
739 lowest_pn = rx_sa->next_pn - secy->replay_window;
740
741 /* Now perform replay protection check again
742 * (see IEEE 802.1AE-2006 figure 10-5)
743 */
744 if (secy->replay_protect && pn < lowest_pn) {
745 spin_unlock(&rx_sa->lock);
746 u64_stats_update_begin(&rxsc_stats->syncp);
747 rxsc_stats->stats.InPktsLate++;
748 u64_stats_update_end(&rxsc_stats->syncp);
749 return false;
750 }
751
752 if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) {
753 u64_stats_update_begin(&rxsc_stats->syncp);
754 if (hdr->tci_an & MACSEC_TCI_E)
755 rxsc_stats->stats.InOctetsDecrypted += skb->len;
756 else
757 rxsc_stats->stats.InOctetsValidated += skb->len;
758 u64_stats_update_end(&rxsc_stats->syncp);
759 }
760
761 if (!macsec_skb_cb(skb)->valid) {
762 spin_unlock(&rx_sa->lock);
763
764 /* 10.6.5 */
765 if (hdr->tci_an & MACSEC_TCI_C ||
766 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
767 u64_stats_update_begin(&rxsc_stats->syncp);
768 rxsc_stats->stats.InPktsNotValid++;
769 u64_stats_update_end(&rxsc_stats->syncp);
770 return false;
771 }
772
773 u64_stats_update_begin(&rxsc_stats->syncp);
774 if (secy->validate_frames == MACSEC_VALIDATE_CHECK) {
775 rxsc_stats->stats.InPktsInvalid++;
776 this_cpu_inc(rx_sa->stats->InPktsInvalid);
777 } else if (pn < lowest_pn) {
778 rxsc_stats->stats.InPktsDelayed++;
779 } else {
780 rxsc_stats->stats.InPktsUnchecked++;
781 }
782 u64_stats_update_end(&rxsc_stats->syncp);
783 } else {
784 u64_stats_update_begin(&rxsc_stats->syncp);
785 if (pn < lowest_pn) {
786 rxsc_stats->stats.InPktsDelayed++;
787 } else {
788 rxsc_stats->stats.InPktsOK++;
789 this_cpu_inc(rx_sa->stats->InPktsOK);
790 }
791 u64_stats_update_end(&rxsc_stats->syncp);
792
793 if (pn >= rx_sa->next_pn)
794 rx_sa->next_pn = pn + 1;
795 spin_unlock(&rx_sa->lock);
796 }
797
798 return true;
799}
800
801static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev)
802{
803 skb->pkt_type = PACKET_HOST;
804 skb->protocol = eth_type_trans(skb, dev);
805
806 skb_reset_network_header(skb);
807 if (!skb_transport_header_was_set(skb))
808 skb_reset_transport_header(skb);
809 skb_reset_mac_len(skb);
810}
811
812static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len)
813{
814 memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN);
815 skb_pull(skb, hdr_len);
816 pskb_trim_unique(skb, skb->len - icv_len);
817}
818
819static void count_rx(struct net_device *dev, int len)
820{
821 struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats);
822
823 u64_stats_update_begin(&stats->syncp);
824 stats->rx_packets++;
825 stats->rx_bytes += len;
826 u64_stats_update_end(&stats->syncp);
827}
828
829static void macsec_decrypt_done(struct crypto_async_request *base, int err)
830{
831 struct sk_buff *skb = base->data;
832 struct net_device *dev = skb->dev;
833 struct macsec_dev *macsec = macsec_priv(dev);
834 struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa;
835 int len, ret;
836 u32 pn;
837
838 aead_request_free(macsec_skb_cb(skb)->req);
839
840 rcu_read_lock_bh();
841 pn = ntohl(macsec_ethhdr(skb)->packet_number);
842 if (!macsec_post_decrypt(skb, &macsec->secy, pn)) {
843 rcu_read_unlock_bh();
844 kfree_skb(skb);
845 goto out;
846 }
847
848 macsec_finalize_skb(skb, macsec->secy.icv_len,
849 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
850 macsec_reset_skb(skb, macsec->secy.netdev);
851
852 len = skb->len;
853 ret = netif_rx(skb);
854 if (ret == NET_RX_SUCCESS)
855 count_rx(dev, len);
856 else
857 macsec->secy.netdev->stats.rx_dropped++;
858
859 rcu_read_unlock_bh();
860
861out:
862 macsec_rxsa_put(rx_sa);
863 dev_put(dev);
864 return;
865}
866
867static struct sk_buff *macsec_decrypt(struct sk_buff *skb,
868 struct net_device *dev,
869 struct macsec_rx_sa *rx_sa,
870 sci_t sci,
871 struct macsec_secy *secy)
872{
873 int ret;
874 struct scatterlist sg[MAX_SKB_FRAGS + 1];
875 unsigned char iv[GCM_AES_IV_LEN];
876 struct aead_request *req;
877 struct macsec_eth_header *hdr;
878 u16 icv_len = secy->icv_len;
879
880 macsec_skb_cb(skb)->valid = false;
881 skb = skb_share_check(skb, GFP_ATOMIC);
882 if (!skb)
c3b7d0bd 883 return ERR_PTR(-ENOMEM);
c09440f7
SD		 884
885 req = aead_request_alloc(rx_sa->key.tfm, GFP_ATOMIC);
886 if (!req) {
887 kfree_skb(skb);
c3b7d0bd 888 return ERR_PTR(-ENOMEM);
c09440f7
SD		 889 }
890
891 hdr = (struct macsec_eth_header *)skb->data;
892 macsec_fill_iv(iv, sci, ntohl(hdr->packet_number));
893
894 sg_init_table(sg, MAX_SKB_FRAGS + 1);
895 skb_to_sgvec(skb, sg, 0, skb->len);
896
897 if (hdr->tci_an & MACSEC_TCI_E) {
898 /* confidentiality: ethernet + macsec header
899 * authenticated, encrypted payload
900 */
901 int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci);
902
903 aead_request_set_crypt(req, sg, sg, len, iv);
904 aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci));
905 skb = skb_unshare(skb, GFP_ATOMIC);
906 if (!skb) {
907 aead_request_free(req);
c3b7d0bd 908 return ERR_PTR(-ENOMEM);
c09440f7
SD		 909 }
910 } else {
911 /* integrity only: all headers + data authenticated */
912 aead_request_set_crypt(req, sg, sg, icv_len, iv);
913 aead_request_set_ad(req, skb->len - icv_len);
914 }
915
916 macsec_skb_cb(skb)->req = req;
917 macsec_skb_cb(skb)->rx_sa = rx_sa;
918 skb->dev = dev;
919 aead_request_set_callback(req, 0, macsec_decrypt_done, skb);
920
921 dev_hold(dev);
922 ret = crypto_aead_decrypt(req);
923 if (ret == -EINPROGRESS) {
c3b7d0bd 924 return ERR_PTR(ret);
c09440f7
SD		 925 } else if (ret != 0) {
926 /* decryption/authentication failed
927 * 10.6 if validateFrames is disabled, deliver anyway
928 */
929 if (ret != -EBADMSG) {
930 kfree_skb(skb);
c3b7d0bd 931 skb = ERR_PTR(ret);
c09440f7
SD		 932 }
933 } else {
934 macsec_skb_cb(skb)->valid = true;
935 }
936 dev_put(dev);
937
938 aead_request_free(req);
939
940 return skb;
941}
942
943static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci)
944{
945 struct macsec_rx_sc *rx_sc;
946
947 for_each_rxsc(secy, rx_sc) {
948 if (rx_sc->sci == sci)
949 return rx_sc;
950 }
951
952 return NULL;
953}
954
955static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci)
956{
957 struct macsec_rx_sc *rx_sc;
958
959 for_each_rxsc_rtnl(secy, rx_sc) {
960 if (rx_sc->sci == sci)
961 return rx_sc;
962 }
963
964 return NULL;
965}
966
967static void handle_not_macsec(struct sk_buff *skb)
968{
969 struct macsec_rxh_data *rxd;
970 struct macsec_dev *macsec;
971
972 rcu_read_lock();
973 rxd = macsec_data_rcu(skb->dev);
974
975 /* 10.6 If the management control validateFrames is not
976 * Strict, frames without a SecTAG are received, counted, and
977 * delivered to the Controlled Port
978 */
979 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
980 struct sk_buff *nskb;
981 int ret;
982 struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats);
983
984 if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
985 u64_stats_update_begin(&secy_stats->syncp);
986 secy_stats->stats.InPktsNoTag++;
987 u64_stats_update_end(&secy_stats->syncp);
988 continue;
989 }
990
991 /* deliver on this port */
992 nskb = skb_clone(skb, GFP_ATOMIC);
993 if (!nskb)
994 break;
995
996 nskb->dev = macsec->secy.netdev;
997
998 ret = netif_rx(nskb);
999 if (ret == NET_RX_SUCCESS) {
1000 u64_stats_update_begin(&secy_stats->syncp);
1001 secy_stats->stats.InPktsUntagged++;
1002 u64_stats_update_end(&secy_stats->syncp);
1003 } else {
1004 macsec->secy.netdev->stats.rx_dropped++;
1005 }
1006 }
1007
1008 rcu_read_unlock();
1009}
1010
1011static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb)
1012{
1013 struct sk_buff *skb = *pskb;
1014 struct net_device *dev = skb->dev;
1015 struct macsec_eth_header *hdr;
1016 struct macsec_secy *secy = NULL;
1017 struct macsec_rx_sc *rx_sc;
1018 struct macsec_rx_sa *rx_sa;
1019 struct macsec_rxh_data *rxd;
1020 struct macsec_dev *macsec;
1021 sci_t sci;
1022 u32 pn;
1023 bool cbit;
1024 struct pcpu_rx_sc_stats *rxsc_stats;
1025 struct pcpu_secy_stats *secy_stats;
1026 bool pulled_sci;
1027
1028 if (skb_headroom(skb) < ETH_HLEN)
1029 goto drop_direct;
1030
1031 hdr = macsec_ethhdr(skb);
1032 if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) {
1033 handle_not_macsec(skb);
1034
1035 /* and deliver to the uncontrolled port */
1036 return RX_HANDLER_PASS;
1037 }
1038
1039 skb = skb_unshare(skb, GFP_ATOMIC);
1040 if (!skb) {
1041 *pskb = NULL;
1042 return RX_HANDLER_CONSUMED;
1043 }
1044
1045 pulled_sci = pskb_may_pull(skb, macsec_extra_len(true));
1046 if (!pulled_sci) {
1047 if (!pskb_may_pull(skb, macsec_extra_len(false)))
1048 goto drop_direct;
1049 }
1050
1051 hdr = macsec_ethhdr(skb);
1052
1053 /* Frames with a SecTAG that has the TCI E bit set but the C
1054 * bit clear are discarded, as this reserved encoding is used
1055 * to identify frames with a SecTAG that are not to be
1056 * delivered to the Controlled Port.
1057 */
1058 if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E)
1059 return RX_HANDLER_PASS;
1060
1061 /* now, pull the extra length */
1062 if (hdr->tci_an & MACSEC_TCI_SC) {
1063 if (!pulled_sci)
1064 goto drop_direct;
1065 }
1066
1067 /* ethernet header is part of crypto processing */
1068 skb_push(skb, ETH_HLEN);
1069
1070 macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC);
1071 macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK;
1072 sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci);
1073
1074 rcu_read_lock();
1075 rxd = macsec_data_rcu(skb->dev);
1076
1077 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1078 struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci);
1079
1080 if (sc) {
1081 secy = &macsec->secy;
1082 rx_sc = sc;
1083 break;
1084 }
1085 }
1086
1087 if (!secy)
1088 goto nosci;
1089
1090 dev = secy->netdev;
1091 macsec = macsec_priv(dev);
1092 secy_stats = this_cpu_ptr(macsec->stats);
1093 rxsc_stats = this_cpu_ptr(rx_sc->stats);
1094
1095 if (!macsec_validate_skb(skb, secy->icv_len)) {
1096 u64_stats_update_begin(&secy_stats->syncp);
1097 secy_stats->stats.InPktsBadTag++;
1098 u64_stats_update_end(&secy_stats->syncp);
1099 goto drop_nosa;
1100 }
1101
1102 rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]);
1103 if (!rx_sa) {
1104 /* 10.6.1 if the SA is not in use */
1105
1106 /* If validateFrames is Strict or the C bit in the
1107 * SecTAG is set, discard
1108 */
1109 if (hdr->tci_an & MACSEC_TCI_C ||
1110 secy->validate_frames == MACSEC_VALIDATE_STRICT) {
1111 u64_stats_update_begin(&rxsc_stats->syncp);
1112 rxsc_stats->stats.InPktsNotUsingSA++;
1113 u64_stats_update_end(&rxsc_stats->syncp);
1114 goto drop_nosa;
1115 }
1116
1117 /* not Strict, the frame (with the SecTAG and ICV
1118 * removed) is delivered to the Controlled Port.
1119 */
1120 u64_stats_update_begin(&rxsc_stats->syncp);
1121 rxsc_stats->stats.InPktsUnusedSA++;
1122 u64_stats_update_end(&rxsc_stats->syncp);
1123 goto deliver;
1124 }
1125
1126 /* First, PN check to avoid decrypting obviously wrong packets */
1127 pn = ntohl(hdr->packet_number);
1128 if (secy->replay_protect) {
1129 bool late;
1130
1131 spin_lock(&rx_sa->lock);
1132 late = rx_sa->next_pn >= secy->replay_window &&
1133 pn < (rx_sa->next_pn - secy->replay_window);
1134 spin_unlock(&rx_sa->lock);
1135
1136 if (late) {
1137 u64_stats_update_begin(&rxsc_stats->syncp);
1138 rxsc_stats->stats.InPktsLate++;
1139 u64_stats_update_end(&rxsc_stats->syncp);
1140 goto drop;
1141 }
1142 }
1143
1144 /* Disabled && !changed text => skip validation */
1145 if (hdr->tci_an & MACSEC_TCI_C ||
1146 secy->validate_frames != MACSEC_VALIDATE_DISABLED)
1147 skb = macsec_decrypt(skb, dev, rx_sa, sci, secy);
1148
c3b7d0bd
SD		 1149 if (IS_ERR(skb)) {
1150 /* the decrypt callback needs the reference */
1151 if (PTR_ERR(skb) != -EINPROGRESS)
1152 macsec_rxsa_put(rx_sa);
c09440f7
SD		 1153 rcu_read_unlock();
1154 *pskb = NULL;
1155 return RX_HANDLER_CONSUMED;
1156 }
1157
1158 if (!macsec_post_decrypt(skb, secy, pn))
1159 goto drop;
1160
1161deliver:
1162 macsec_finalize_skb(skb, secy->icv_len,
1163 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1164 macsec_reset_skb(skb, secy->netdev);
1165
497f358a
SD		 1166 if (rx_sa)
1167 macsec_rxsa_put(rx_sa);
c09440f7
SD		 1168 count_rx(dev, skb->len);
1169
1170 rcu_read_unlock();
1171
1172 *pskb = skb;
1173 return RX_HANDLER_ANOTHER;
1174
1175drop:
1176 macsec_rxsa_put(rx_sa);
1177drop_nosa:
1178 rcu_read_unlock();
1179drop_direct:
1180 kfree_skb(skb);
1181 *pskb = NULL;
1182 return RX_HANDLER_CONSUMED;
1183
1184nosci:
1185 /* 10.6.1 if the SC is not found */
1186 cbit = !!(hdr->tci_an & MACSEC_TCI_C);
1187 if (!cbit)
1188 macsec_finalize_skb(skb, DEFAULT_ICV_LEN,
1189 macsec_extra_len(macsec_skb_cb(skb)->has_sci));
1190
1191 list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
1192 struct sk_buff *nskb;
1193 int ret;
1194
1195 secy_stats = this_cpu_ptr(macsec->stats);
1196
1197 /* If validateFrames is Strict or the C bit in the
1198 * SecTAG is set, discard
1199 */
1200 if (cbit ||
1201 macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) {
1202 u64_stats_update_begin(&secy_stats->syncp);
1203 secy_stats->stats.InPktsNoSCI++;
1204 u64_stats_update_end(&secy_stats->syncp);
1205 continue;
1206 }
1207
1208 /* not strict, the frame (with the SecTAG and ICV
1209 * removed) is delivered to the Controlled Port.
1210 */
1211 nskb = skb_clone(skb, GFP_ATOMIC);
1212 if (!nskb)
1213 break;
1214
1215 macsec_reset_skb(nskb, macsec->secy.netdev);
1216
1217 ret = netif_rx(nskb);
1218 if (ret == NET_RX_SUCCESS) {
1219 u64_stats_update_begin(&secy_stats->syncp);
1220 secy_stats->stats.InPktsUnknownSCI++;
1221 u64_stats_update_end(&secy_stats->syncp);
1222 } else {
1223 macsec->secy.netdev->stats.rx_dropped++;
1224 }
1225 }
1226
1227 rcu_read_unlock();
1228 *pskb = skb;
1229 return RX_HANDLER_PASS;
1230}
1231
1232static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len)
1233{
1234 struct crypto_aead *tfm;
1235 int ret;
1236
1237 tfm = crypto_alloc_aead("gcm(aes)", 0, CRYPTO_ALG_ASYNC);
1238 if (!tfm || IS_ERR(tfm))
1239 return NULL;
1240
1241 ret = crypto_aead_setkey(tfm, key, key_len);
1242 if (ret < 0) {
1243 crypto_free_aead(tfm);
1244 return NULL;
1245 }
1246
1247 ret = crypto_aead_setauthsize(tfm, icv_len);
1248 if (ret < 0) {
1249 crypto_free_aead(tfm);
1250 return NULL;
1251 }
1252
1253 return tfm;
1254}
1255
1256static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len,
1257 int icv_len)
1258{
1259 rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats);
1260 if (!rx_sa->stats)
1261 return -1;
1262
1263 rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1264 if (!rx_sa->key.tfm) {
1265 free_percpu(rx_sa->stats);
1266 return -1;
1267 }
1268
1269 rx_sa->active = false;
1270 rx_sa->next_pn = 1;
1271 atomic_set(&rx_sa->refcnt, 1);
1272 spin_lock_init(&rx_sa->lock);
1273
1274 return 0;
1275}
1276
1277static void clear_rx_sa(struct macsec_rx_sa *rx_sa)
1278{
1279 rx_sa->active = false;
1280
1281 macsec_rxsa_put(rx_sa);
1282}
1283
1284static void free_rx_sc(struct macsec_rx_sc *rx_sc)
1285{
1286 int i;
1287
1288 for (i = 0; i < MACSEC_NUM_AN; i++) {
1289 struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]);
1290
1291 RCU_INIT_POINTER(rx_sc->sa[i], NULL);
1292 if (sa)
1293 clear_rx_sa(sa);
1294 }
1295
1296 macsec_rxsc_put(rx_sc);
1297}
1298
1299static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci)
1300{
1301 struct macsec_rx_sc *rx_sc, __rcu **rx_scp;
1302
1303 for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp);
1304 rx_sc;
1305 rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) {
1306 if (rx_sc->sci == sci) {
1307 if (rx_sc->active)
1308 secy->n_rx_sc--;
1309 rcu_assign_pointer(*rx_scp, rx_sc->next);
1310 return rx_sc;
1311 }
1312 }
1313
1314 return NULL;
1315}
1316
1317static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci)
1318{
1319 struct macsec_rx_sc *rx_sc;
1320 struct macsec_dev *macsec;
1321 struct net_device *real_dev = macsec_priv(dev)->real_dev;
1322 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
1323 struct macsec_secy *secy;
1324
1325 list_for_each_entry(macsec, &rxd->secys, secys) {
1326 if (find_rx_sc_rtnl(&macsec->secy, sci))
1327 return ERR_PTR(-EEXIST);
1328 }
1329
1330 rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL);
1331 if (!rx_sc)
1332 return ERR_PTR(-ENOMEM);
1333
1334 rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats);
1335 if (!rx_sc->stats) {
1336 kfree(rx_sc);
1337 return ERR_PTR(-ENOMEM);
1338 }
1339
1340 rx_sc->sci = sci;
1341 rx_sc->active = true;
1342 atomic_set(&rx_sc->refcnt, 1);
1343
1344 secy = &macsec_priv(dev)->secy;
1345 rcu_assign_pointer(rx_sc->next, secy->rx_sc);
1346 rcu_assign_pointer(secy->rx_sc, rx_sc);
1347
1348 if (rx_sc->active)
1349 secy->n_rx_sc++;
1350
1351 return rx_sc;
1352}
1353
1354static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len,
1355 int icv_len)
1356{
1357 tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats);
1358 if (!tx_sa->stats)
1359 return -1;
1360
1361 tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len);
1362 if (!tx_sa->key.tfm) {
1363 free_percpu(tx_sa->stats);
1364 return -1;
1365 }
1366
1367 tx_sa->active = false;
1368 atomic_set(&tx_sa->refcnt, 1);
1369 spin_lock_init(&tx_sa->lock);
1370
1371 return 0;
1372}
1373
1374static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
1375{
1376 tx_sa->active = false;
1377
1378 macsec_txsa_put(tx_sa);
1379}
1380
1381static struct genl_family macsec_fam = {
1382 .id = GENL_ID_GENERATE,
1383 .name = MACSEC_GENL_NAME,
1384 .hdrsize = 0,
1385 .version = MACSEC_GENL_VERSION,
1386 .maxattr = MACSEC_ATTR_MAX,
1387 .netnsok = true,
1388};
1389
1390static struct net_device *get_dev_from_nl(struct net *net,
1391 struct nlattr **attrs)
1392{
1393 int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]);
1394 struct net_device *dev;
1395
1396 dev = __dev_get_by_index(net, ifindex);
1397 if (!dev)
1398 return ERR_PTR(-ENODEV);
1399
1400 if (!netif_is_macsec(dev))
1401 return ERR_PTR(-ENODEV);
1402
1403 return dev;
1404}
1405
1406static sci_t nla_get_sci(const struct nlattr *nla)
1407{
1408 return (__force sci_t)nla_get_u64(nla);
1409}
1410
1411static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value)
1412{
1413 return nla_put_u64(skb, attrtype, (__force u64)value);
1414}
1415
1416static struct macsec_tx_sa *get_txsa_from_nl(struct net *net,
1417 struct nlattr **attrs,
1418 struct nlattr **tb_sa,
1419 struct net_device **devp,
1420 struct macsec_secy **secyp,
1421 struct macsec_tx_sc **scp,
1422 u8 *assoc_num)
1423{
1424 struct net_device *dev;
1425 struct macsec_secy *secy;
1426 struct macsec_tx_sc *tx_sc;
1427 struct macsec_tx_sa *tx_sa;
1428
1429 if (!tb_sa[MACSEC_SA_ATTR_AN])
1430 return ERR_PTR(-EINVAL);
1431
1432 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1433
1434 dev = get_dev_from_nl(net, attrs);
1435 if (IS_ERR(dev))
1436 return ERR_CAST(dev);
1437
1438 if (*assoc_num >= MACSEC_NUM_AN)
1439 return ERR_PTR(-EINVAL);
1440
1441 secy = &macsec_priv(dev)->secy;
1442 tx_sc = &secy->tx_sc;
1443
1444 tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]);
1445 if (!tx_sa)
1446 return ERR_PTR(-ENODEV);
1447
1448 *devp = dev;
1449 *scp = tx_sc;
1450 *secyp = secy;
1451 return tx_sa;
1452}
1453
1454static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net,
1455 struct nlattr **attrs,
1456 struct nlattr **tb_rxsc,
1457 struct net_device **devp,
1458 struct macsec_secy **secyp)
1459{
1460 struct net_device *dev;
1461 struct macsec_secy *secy;
1462 struct macsec_rx_sc *rx_sc;
1463 sci_t sci;
1464
1465 dev = get_dev_from_nl(net, attrs);
1466 if (IS_ERR(dev))
1467 return ERR_CAST(dev);
1468
1469 secy = &macsec_priv(dev)->secy;
1470
1471 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1472 return ERR_PTR(-EINVAL);
1473
1474 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1475 rx_sc = find_rx_sc_rtnl(secy, sci);
1476 if (!rx_sc)
1477 return ERR_PTR(-ENODEV);
1478
1479 *secyp = secy;
1480 *devp = dev;
1481
1482 return rx_sc;
1483}
1484
1485static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net,
1486 struct nlattr **attrs,
1487 struct nlattr **tb_rxsc,
1488 struct nlattr **tb_sa,
1489 struct net_device **devp,
1490 struct macsec_secy **secyp,
1491 struct macsec_rx_sc **scp,
1492 u8 *assoc_num)
1493{
1494 struct macsec_rx_sc *rx_sc;
1495 struct macsec_rx_sa *rx_sa;
1496
1497 if (!tb_sa[MACSEC_SA_ATTR_AN])
1498 return ERR_PTR(-EINVAL);
1499
1500 *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1501 if (*assoc_num >= MACSEC_NUM_AN)
1502 return ERR_PTR(-EINVAL);
1503
1504 rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp);
1505 if (IS_ERR(rx_sc))
1506 return ERR_CAST(rx_sc);
1507
1508 rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]);
1509 if (!rx_sa)
1510 return ERR_PTR(-ENODEV);
1511
1512 *scp = rx_sc;
1513 return rx_sa;
1514}
1515
1516
1517static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = {
1518 [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 },
1519 [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED },
1520 [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED },
1521};
1522
1523static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = {
1524 [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 },
1525 [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 },
1526};
1527
1528static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = {
1529 [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 },
1530 [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 },
1531 [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 },
1532 [MACSEC_SA_ATTR_KEYID] = { .type = NLA_U64 },
1533 [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY,
1534 .len = MACSEC_MAX_KEY_LEN, },
1535};
1536
1537static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa)
1538{
1539 if (!attrs[MACSEC_ATTR_SA_CONFIG])
1540 return -EINVAL;
1541
1542 if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG],
1543 macsec_genl_sa_policy))
1544 return -EINVAL;
1545
1546 return 0;
1547}
1548
1549static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc)
1550{
1551 if (!attrs[MACSEC_ATTR_RXSC_CONFIG])
1552 return -EINVAL;
1553
1554 if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG],
1555 macsec_genl_rxsc_policy))
1556 return -EINVAL;
1557
1558 return 0;
1559}
1560
1561static bool validate_add_rxsa(struct nlattr **attrs)
1562{
1563 if (!attrs[MACSEC_SA_ATTR_AN] ||
1564 !attrs[MACSEC_SA_ATTR_KEY] ||
1565 !attrs[MACSEC_SA_ATTR_KEYID])
1566 return false;
1567
1568 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1569 return false;
1570
1571 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1572 return false;
1573
1574 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1575 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1576 return false;
1577 }
1578
1579 return true;
1580}
1581
1582static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info)
1583{
1584 struct net_device *dev;
1585 struct nlattr **attrs = info->attrs;
1586 struct macsec_secy *secy;
1587 struct macsec_rx_sc *rx_sc;
1588 struct macsec_rx_sa *rx_sa;
1589 unsigned char assoc_num;
1590 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1591 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1592
1593 if (!attrs[MACSEC_ATTR_IFINDEX])
1594 return -EINVAL;
1595
1596 if (parse_sa_config(attrs, tb_sa))
1597 return -EINVAL;
1598
1599 if (parse_rxsc_config(attrs, tb_rxsc))
1600 return -EINVAL;
1601
1602 if (!validate_add_rxsa(tb_sa))
1603 return -EINVAL;
1604
1605 rtnl_lock();
1606 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
1607 if (IS_ERR(rx_sc) || !macsec_rxsc_get(rx_sc)) {
1608 rtnl_unlock();
1609 return PTR_ERR(rx_sc);
1610 }
1611
1612 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1613
1614 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1615 pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n",
1616 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1617 rtnl_unlock();
1618 return -EINVAL;
1619 }
1620
1621 rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]);
1622 if (rx_sa) {
1623 rtnl_unlock();
1624 return -EBUSY;
1625 }
1626
1627 rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL);
72f2a05b
SD		 1628 if (!rx_sa || init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1629 secy->key_len, secy->icv_len)) {
c09440f7
SD		 1630 rtnl_unlock();
1631 return -ENOMEM;
1632 }
1633
1634 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1635 spin_lock_bh(&rx_sa->lock);
1636 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1637 spin_unlock_bh(&rx_sa->lock);
1638 }
1639
1640 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1641 rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1642
1643 rx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]);
1644 rx_sa->sc = rx_sc;
1645 rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa);
1646
1647 rtnl_unlock();
1648
1649 return 0;
1650}
1651
1652static bool validate_add_rxsc(struct nlattr **attrs)
1653{
1654 if (!attrs[MACSEC_RXSC_ATTR_SCI])
1655 return false;
1656
1657 if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) {
1658 if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1)
1659 return false;
1660 }
1661
1662 return true;
1663}
1664
1665static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info)
1666{
1667 struct net_device *dev;
1668 sci_t sci = MACSEC_UNDEF_SCI;
1669 struct nlattr **attrs = info->attrs;
1670 struct macsec_rx_sc *rx_sc;
1671 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1672
1673 if (!attrs[MACSEC_ATTR_IFINDEX])
1674 return -EINVAL;
1675
1676 if (parse_rxsc_config(attrs, tb_rxsc))
1677 return -EINVAL;
1678
1679 if (!validate_add_rxsc(tb_rxsc))
1680 return -EINVAL;
1681
1682 rtnl_lock();
1683 dev = get_dev_from_nl(genl_info_net(info), attrs);
1684 if (IS_ERR(dev)) {
1685 rtnl_unlock();
1686 return PTR_ERR(dev);
1687 }
1688
1689 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1690
1691 rx_sc = create_rx_sc(dev, sci);
1692 if (IS_ERR(rx_sc)) {
1693 rtnl_unlock();
1694 return PTR_ERR(rx_sc);
1695 }
1696
1697 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE])
1698 rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
1699
1700 rtnl_unlock();
1701
1702 return 0;
1703}
1704
1705static bool validate_add_txsa(struct nlattr **attrs)
1706{
1707 if (!attrs[MACSEC_SA_ATTR_AN] ||
1708 !attrs[MACSEC_SA_ATTR_PN] ||
1709 !attrs[MACSEC_SA_ATTR_KEY] ||
1710 !attrs[MACSEC_SA_ATTR_KEYID])
1711 return false;
1712
1713 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1714 return false;
1715
1716 if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1717 return false;
1718
1719 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1720 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1721 return false;
1722 }
1723
1724 return true;
1725}
1726
1727static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info)
1728{
1729 struct net_device *dev;
1730 struct nlattr **attrs = info->attrs;
1731 struct macsec_secy *secy;
1732 struct macsec_tx_sc *tx_sc;
1733 struct macsec_tx_sa *tx_sa;
1734 unsigned char assoc_num;
1735 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1736
1737 if (!attrs[MACSEC_ATTR_IFINDEX])
1738 return -EINVAL;
1739
1740 if (parse_sa_config(attrs, tb_sa))
1741 return -EINVAL;
1742
1743 if (!validate_add_txsa(tb_sa))
1744 return -EINVAL;
1745
1746 rtnl_lock();
1747 dev = get_dev_from_nl(genl_info_net(info), attrs);
1748 if (IS_ERR(dev)) {
1749 rtnl_unlock();
1750 return PTR_ERR(dev);
1751 }
1752
1753 secy = &macsec_priv(dev)->secy;
1754 tx_sc = &secy->tx_sc;
1755
1756 assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]);
1757
1758 if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) {
1759 pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n",
1760 nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len);
1761 rtnl_unlock();
1762 return -EINVAL;
1763 }
1764
1765 tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]);
1766 if (tx_sa) {
1767 rtnl_unlock();
1768 return -EBUSY;
1769 }
1770
1771 tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL);
1772 if (!tx_sa || init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]),
1773 secy->key_len, secy->icv_len)) {
1774 rtnl_unlock();
1775 return -ENOMEM;
1776 }
1777
1778 tx_sa->key.id = nla_get_u64(tb_sa[MACSEC_SA_ATTR_KEYID]);
1779
1780 spin_lock_bh(&tx_sa->lock);
1781 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1782 spin_unlock_bh(&tx_sa->lock);
1783
1784 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1785 tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1786
1787 if (assoc_num == tx_sc->encoding_sa && tx_sa->active)
1788 secy->operational = true;
1789
1790 rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa);
1791
1792 rtnl_unlock();
1793
1794 return 0;
1795}
1796
1797static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info)
1798{
1799 struct nlattr **attrs = info->attrs;
1800 struct net_device *dev;
1801 struct macsec_secy *secy;
1802 struct macsec_rx_sc *rx_sc;
1803 struct macsec_rx_sa *rx_sa;
1804 u8 assoc_num;
1805 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1806 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1807
1808 if (!attrs[MACSEC_ATTR_IFINDEX])
1809 return -EINVAL;
1810
1811 if (parse_sa_config(attrs, tb_sa))
1812 return -EINVAL;
1813
1814 if (parse_rxsc_config(attrs, tb_rxsc))
1815 return -EINVAL;
1816
1817 rtnl_lock();
1818 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
1819 &dev, &secy, &rx_sc, &assoc_num);
1820 if (IS_ERR(rx_sa)) {
1821 rtnl_unlock();
1822 return PTR_ERR(rx_sa);
1823 }
1824
1825 if (rx_sa->active) {
1826 rtnl_unlock();
1827 return -EBUSY;
1828 }
1829
1830 RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL);
1831 clear_rx_sa(rx_sa);
1832
1833 rtnl_unlock();
1834
1835 return 0;
1836}
1837
1838static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info)
1839{
1840 struct nlattr **attrs = info->attrs;
1841 struct net_device *dev;
1842 struct macsec_secy *secy;
1843 struct macsec_rx_sc *rx_sc;
1844 sci_t sci;
1845 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1846
1847 if (!attrs[MACSEC_ATTR_IFINDEX])
1848 return -EINVAL;
1849
1850 if (parse_rxsc_config(attrs, tb_rxsc))
1851 return -EINVAL;
1852
1853 if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI])
1854 return -EINVAL;
1855
1856 rtnl_lock();
1857 dev = get_dev_from_nl(genl_info_net(info), info->attrs);
1858 if (IS_ERR(dev)) {
1859 rtnl_unlock();
1860 return PTR_ERR(dev);
1861 }
1862
1863 secy = &macsec_priv(dev)->secy;
1864 sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]);
1865
1866 rx_sc = del_rx_sc(secy, sci);
1867 if (!rx_sc) {
1868 rtnl_unlock();
1869 return -ENODEV;
1870 }
1871
1872 free_rx_sc(rx_sc);
1873 rtnl_unlock();
1874
1875 return 0;
1876}
1877
1878static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info)
1879{
1880 struct nlattr **attrs = info->attrs;
1881 struct net_device *dev;
1882 struct macsec_secy *secy;
1883 struct macsec_tx_sc *tx_sc;
1884 struct macsec_tx_sa *tx_sa;
1885 u8 assoc_num;
1886 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1887
1888 if (!attrs[MACSEC_ATTR_IFINDEX])
1889 return -EINVAL;
1890
1891 if (parse_sa_config(attrs, tb_sa))
1892 return -EINVAL;
1893
1894 rtnl_lock();
1895 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1896 &dev, &secy, &tx_sc, &assoc_num);
1897 if (IS_ERR(tx_sa)) {
1898 rtnl_unlock();
1899 return PTR_ERR(tx_sa);
1900 }
1901
1902 if (tx_sa->active) {
1903 rtnl_unlock();
1904 return -EBUSY;
1905 }
1906
1907 RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL);
1908 clear_tx_sa(tx_sa);
1909
1910 rtnl_unlock();
1911
1912 return 0;
1913}
1914
1915static bool validate_upd_sa(struct nlattr **attrs)
1916{
1917 if (!attrs[MACSEC_SA_ATTR_AN] ||
1918 attrs[MACSEC_SA_ATTR_KEY] ||
1919 attrs[MACSEC_SA_ATTR_KEYID])
1920 return false;
1921
1922 if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN)
1923 return false;
1924
1925 if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0)
1926 return false;
1927
1928 if (attrs[MACSEC_SA_ATTR_ACTIVE]) {
1929 if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1)
1930 return false;
1931 }
1932
1933 return true;
1934}
1935
1936static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info)
1937{
1938 struct nlattr **attrs = info->attrs;
1939 struct net_device *dev;
1940 struct macsec_secy *secy;
1941 struct macsec_tx_sc *tx_sc;
1942 struct macsec_tx_sa *tx_sa;
1943 u8 assoc_num;
1944 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1945
1946 if (!attrs[MACSEC_ATTR_IFINDEX])
1947 return -EINVAL;
1948
1949 if (parse_sa_config(attrs, tb_sa))
1950 return -EINVAL;
1951
1952 if (!validate_upd_sa(tb_sa))
1953 return -EINVAL;
1954
1955 rtnl_lock();
1956 tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa,
1957 &dev, &secy, &tx_sc, &assoc_num);
1958 if (IS_ERR(tx_sa)) {
1959 rtnl_unlock();
1960 return PTR_ERR(tx_sa);
1961 }
1962
1963 if (tb_sa[MACSEC_SA_ATTR_PN]) {
1964 spin_lock_bh(&tx_sa->lock);
1965 tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
1966 spin_unlock_bh(&tx_sa->lock);
1967 }
1968
1969 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
1970 tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
1971
1972 if (assoc_num == tx_sc->encoding_sa)
1973 secy->operational = tx_sa->active;
1974
1975 rtnl_unlock();
1976
1977 return 0;
1978}
1979
1980static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info)
1981{
1982 struct nlattr **attrs = info->attrs;
1983 struct net_device *dev;
1984 struct macsec_secy *secy;
1985 struct macsec_rx_sc *rx_sc;
1986 struct macsec_rx_sa *rx_sa;
1987 u8 assoc_num;
1988 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
1989 struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1];
1990
1991 if (!attrs[MACSEC_ATTR_IFINDEX])
1992 return -EINVAL;
1993
1994 if (parse_rxsc_config(attrs, tb_rxsc))
1995 return -EINVAL;
1996
1997 if (parse_sa_config(attrs, tb_sa))
1998 return -EINVAL;
1999
2000 if (!validate_upd_sa(tb_sa))
2001 return -EINVAL;
2002
2003 rtnl_lock();
2004 rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa,
2005 &dev, &secy, &rx_sc, &assoc_num);
2006 if (IS_ERR(rx_sa)) {
2007 rtnl_unlock();
2008 return PTR_ERR(rx_sa);
2009 }
2010
2011 if (tb_sa[MACSEC_SA_ATTR_PN]) {
2012 spin_lock_bh(&rx_sa->lock);
2013 rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]);
2014 spin_unlock_bh(&rx_sa->lock);
2015 }
2016
2017 if (tb_sa[MACSEC_SA_ATTR_ACTIVE])
2018 rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]);
2019
2020 rtnl_unlock();
2021 return 0;
2022}
2023
2024static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info)
2025{
2026 struct nlattr **attrs = info->attrs;
2027 struct net_device *dev;
2028 struct macsec_secy *secy;
2029 struct macsec_rx_sc *rx_sc;
2030 struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1];
2031
2032 if (!attrs[MACSEC_ATTR_IFINDEX])
2033 return -EINVAL;
2034
2035 if (parse_rxsc_config(attrs, tb_rxsc))
2036 return -EINVAL;
2037
2038 if (!validate_add_rxsc(tb_rxsc))
2039 return -EINVAL;
2040
2041 rtnl_lock();
2042 rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy);
2043 if (IS_ERR(rx_sc)) {
2044 rtnl_unlock();
2045 return PTR_ERR(rx_sc);
2046 }
2047
2048 if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) {
2049 bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]);
2050
2051 if (rx_sc->active != new)
2052 secy->n_rx_sc += new ? 1 : -1;
2053
2054 rx_sc->active = new;
2055 }
2056
2057 rtnl_unlock();
2058
2059 return 0;
2060}
2061
2062static int copy_tx_sa_stats(struct sk_buff *skb,
2063 struct macsec_tx_sa_stats __percpu *pstats)
2064{
2065 struct macsec_tx_sa_stats sum = {0, };
2066 int cpu;
2067
2068 for_each_possible_cpu(cpu) {
2069 const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2070
2071 sum.OutPktsProtected += stats->OutPktsProtected;
2072 sum.OutPktsEncrypted += stats->OutPktsEncrypted;
2073 }
2074
2075 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2076 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted))
2077 return -EMSGSIZE;
2078
2079 return 0;
2080}
2081
2082static int copy_rx_sa_stats(struct sk_buff *skb,
2083 struct macsec_rx_sa_stats __percpu *pstats)
2084{
2085 struct macsec_rx_sa_stats sum = {0, };
2086 int cpu;
2087
2088 for_each_possible_cpu(cpu) {
2089 const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu);
2090
2091 sum.InPktsOK += stats->InPktsOK;
2092 sum.InPktsInvalid += stats->InPktsInvalid;
2093 sum.InPktsNotValid += stats->InPktsNotValid;
2094 sum.InPktsNotUsingSA += stats->InPktsNotUsingSA;
2095 sum.InPktsUnusedSA += stats->InPktsUnusedSA;
2096 }
2097
2098 if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2099 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2100 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2101 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2102 nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2103 return -EMSGSIZE;
2104
2105 return 0;
2106}
2107
2108static int copy_rx_sc_stats(struct sk_buff *skb,
2109 struct pcpu_rx_sc_stats __percpu *pstats)
2110{
2111 struct macsec_rx_sc_stats sum = {0, };
2112 int cpu;
2113
2114 for_each_possible_cpu(cpu) {
2115 const struct pcpu_rx_sc_stats *stats;
2116 struct macsec_rx_sc_stats tmp;
2117 unsigned int start;
2118
2119 stats = per_cpu_ptr(pstats, cpu);
2120 do {
2121 start = u64_stats_fetch_begin_irq(&stats->syncp);
2122 memcpy(&tmp, &stats->stats, sizeof(tmp));
2123 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2124
2125 sum.InOctetsValidated += tmp.InOctetsValidated;
2126 sum.InOctetsDecrypted += tmp.InOctetsDecrypted;
2127 sum.InPktsUnchecked += tmp.InPktsUnchecked;
2128 sum.InPktsDelayed += tmp.InPktsDelayed;
2129 sum.InPktsOK += tmp.InPktsOK;
2130 sum.InPktsInvalid += tmp.InPktsInvalid;
2131 sum.InPktsLate += tmp.InPktsLate;
2132 sum.InPktsNotValid += tmp.InPktsNotValid;
2133 sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA;
2134 sum.InPktsUnusedSA += tmp.InPktsUnusedSA;
2135 }
2136
2137 if (nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, sum.InOctetsValidated) ||
2138 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, sum.InOctetsDecrypted) ||
2139 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, sum.InPktsUnchecked) ||
2140 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, sum.InPktsDelayed) ||
2141 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) ||
2142 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) ||
2143 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, sum.InPktsLate) ||
2144 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) ||
2145 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) ||
2146 nla_put_u64(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA))
2147 return -EMSGSIZE;
2148
2149 return 0;
2150}
2151
2152static int copy_tx_sc_stats(struct sk_buff *skb,
2153 struct pcpu_tx_sc_stats __percpu *pstats)
2154{
2155 struct macsec_tx_sc_stats sum = {0, };
2156 int cpu;
2157
2158 for_each_possible_cpu(cpu) {
2159 const struct pcpu_tx_sc_stats *stats;
2160 struct macsec_tx_sc_stats tmp;
2161 unsigned int start;
2162
2163 stats = per_cpu_ptr(pstats, cpu);
2164 do {
2165 start = u64_stats_fetch_begin_irq(&stats->syncp);
2166 memcpy(&tmp, &stats->stats, sizeof(tmp));
2167 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2168
2169 sum.OutPktsProtected += tmp.OutPktsProtected;
2170 sum.OutPktsEncrypted += tmp.OutPktsEncrypted;
2171 sum.OutOctetsProtected += tmp.OutOctetsProtected;
2172 sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted;
2173 }
2174
2175 if (nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) ||
2176 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted) ||
2177 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, sum.OutOctetsProtected) ||
2178 nla_put_u64(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, sum.OutOctetsEncrypted))
2179 return -EMSGSIZE;
2180
2181 return 0;
2182}
2183
2184static int copy_secy_stats(struct sk_buff *skb,
2185 struct pcpu_secy_stats __percpu *pstats)
2186{
2187 struct macsec_dev_stats sum = {0, };
2188 int cpu;
2189
2190 for_each_possible_cpu(cpu) {
2191 const struct pcpu_secy_stats *stats;
2192 struct macsec_dev_stats tmp;
2193 unsigned int start;
2194
2195 stats = per_cpu_ptr(pstats, cpu);
2196 do {
2197 start = u64_stats_fetch_begin_irq(&stats->syncp);
2198 memcpy(&tmp, &stats->stats, sizeof(tmp));
2199 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2200
2201 sum.OutPktsUntagged += tmp.OutPktsUntagged;
2202 sum.InPktsUntagged += tmp.InPktsUntagged;
2203 sum.OutPktsTooLong += tmp.OutPktsTooLong;
2204 sum.InPktsNoTag += tmp.InPktsNoTag;
2205 sum.InPktsBadTag += tmp.InPktsBadTag;
2206 sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI;
2207 sum.InPktsNoSCI += tmp.InPktsNoSCI;
2208 sum.InPktsOverrun += tmp.InPktsOverrun;
2209 }
2210
2211 if (nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, sum.OutPktsUntagged) ||
2212 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, sum.InPktsUntagged) ||
2213 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, sum.OutPktsTooLong) ||
2214 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, sum.InPktsNoTag) ||
2215 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, sum.InPktsBadTag) ||
2216 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, sum.InPktsUnknownSCI) ||
2217 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, sum.InPktsNoSCI) ||
2218 nla_put_u64(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, sum.InPktsOverrun))
2219 return -EMSGSIZE;
2220
2221 return 0;
2222}
2223
2224static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb)
2225{
2226 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2227 struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY);
2228
2229 if (!secy_nest)
2230 return 1;
2231
2232 if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci) ||
2233 nla_put_u64(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, DEFAULT_CIPHER_ID) ||
2234 nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) ||
2235 nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) ||
2236 nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) ||
2237 nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) ||
2238 nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) ||
2239 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) ||
2240 nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) ||
2241 nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) ||
2242 nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) ||
2243 nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa))
2244 goto cancel;
2245
2246 if (secy->replay_protect) {
2247 if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window))
2248 goto cancel;
2249 }
2250
2251 nla_nest_end(skb, secy_nest);
2252 return 0;
2253
2254cancel:
2255 nla_nest_cancel(skb, secy_nest);
2256 return 1;
2257}
2258
2259static int dump_secy(struct macsec_secy *secy, struct net_device *dev,
2260 struct sk_buff *skb, struct netlink_callback *cb)
2261{
2262 struct macsec_rx_sc *rx_sc;
2263 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
2264 struct nlattr *txsa_list, *rxsc_list;
2265 int i, j;
2266 void *hdr;
2267 struct nlattr *attr;
2268
2269 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
2270 &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC);
2271 if (!hdr)
2272 return -EMSGSIZE;
2273
96cfc505
SD		 2274 genl_dump_check_consistent(cb, hdr, &macsec_fam);
2275
c09440f7
SD		 2276 if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex))
2277 goto nla_put_failure;
2278
2279 if (nla_put_secy(secy, skb))
2280 goto nla_put_failure;
2281
2282 attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS);
2283 if (!attr)
2284 goto nla_put_failure;
2285 if (copy_tx_sc_stats(skb, tx_sc->stats)) {
2286 nla_nest_cancel(skb, attr);
2287 goto nla_put_failure;
2288 }
2289 nla_nest_end(skb, attr);
2290
2291 attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS);
2292 if (!attr)
2293 goto nla_put_failure;
2294 if (copy_secy_stats(skb, macsec_priv(dev)->stats)) {
2295 nla_nest_cancel(skb, attr);
2296 goto nla_put_failure;
2297 }
2298 nla_nest_end(skb, attr);
2299
2300 txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST);
2301 if (!txsa_list)
2302 goto nla_put_failure;
2303 for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) {
2304 struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]);
2305 struct nlattr *txsa_nest;
2306
2307 if (!tx_sa)
2308 continue;
2309
2310 txsa_nest = nla_nest_start(skb, j++);
2311 if (!txsa_nest) {
2312 nla_nest_cancel(skb, txsa_list);
2313 goto nla_put_failure;
2314 }
2315
2316 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2317 nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) ||
2318 nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, tx_sa->key.id) ||
2319 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) {
2320 nla_nest_cancel(skb, txsa_nest);
2321 nla_nest_cancel(skb, txsa_list);
2322 goto nla_put_failure;
2323 }
2324
2325 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2326 if (!attr) {
2327 nla_nest_cancel(skb, txsa_nest);
2328 nla_nest_cancel(skb, txsa_list);
2329 goto nla_put_failure;
2330 }
2331 if (copy_tx_sa_stats(skb, tx_sa->stats)) {
2332 nla_nest_cancel(skb, attr);
2333 nla_nest_cancel(skb, txsa_nest);
2334 nla_nest_cancel(skb, txsa_list);
2335 goto nla_put_failure;
2336 }
2337 nla_nest_end(skb, attr);
2338
2339 nla_nest_end(skb, txsa_nest);
2340 }
2341 nla_nest_end(skb, txsa_list);
2342
2343 rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST);
2344 if (!rxsc_list)
2345 goto nla_put_failure;
2346
2347 j = 1;
2348 for_each_rxsc_rtnl(secy, rx_sc) {
2349 int k;
2350 struct nlattr *rxsa_list;
2351 struct nlattr *rxsc_nest = nla_nest_start(skb, j++);
2352
2353 if (!rxsc_nest) {
2354 nla_nest_cancel(skb, rxsc_list);
2355 goto nla_put_failure;
2356 }
2357
2358 if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) ||
2359 nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci)) {
2360 nla_nest_cancel(skb, rxsc_nest);
2361 nla_nest_cancel(skb, rxsc_list);
2362 goto nla_put_failure;
2363 }
2364
2365 attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS);
2366 if (!attr) {
2367 nla_nest_cancel(skb, rxsc_nest);
2368 nla_nest_cancel(skb, rxsc_list);
2369 goto nla_put_failure;
2370 }
2371 if (copy_rx_sc_stats(skb, rx_sc->stats)) {
2372 nla_nest_cancel(skb, attr);
2373 nla_nest_cancel(skb, rxsc_nest);
2374 nla_nest_cancel(skb, rxsc_list);
2375 goto nla_put_failure;
2376 }
2377 nla_nest_end(skb, attr);
2378
2379 rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST);
2380 if (!rxsa_list) {
2381 nla_nest_cancel(skb, rxsc_nest);
2382 nla_nest_cancel(skb, rxsc_list);
2383 goto nla_put_failure;
2384 }
2385
2386 for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) {
2387 struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]);
2388 struct nlattr *rxsa_nest;
2389
2390 if (!rx_sa)
2391 continue;
2392
2393 rxsa_nest = nla_nest_start(skb, k++);
2394 if (!rxsa_nest) {
2395 nla_nest_cancel(skb, rxsa_list);
2396 nla_nest_cancel(skb, rxsc_nest);
2397 nla_nest_cancel(skb, rxsc_list);
2398 goto nla_put_failure;
2399 }
2400
2401 attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS);
2402 if (!attr) {
2403 nla_nest_cancel(skb, rxsa_list);
2404 nla_nest_cancel(skb, rxsc_nest);
2405 nla_nest_cancel(skb, rxsc_list);
2406 goto nla_put_failure;
2407 }
2408 if (copy_rx_sa_stats(skb, rx_sa->stats)) {
2409 nla_nest_cancel(skb, attr);
2410 nla_nest_cancel(skb, rxsa_list);
2411 nla_nest_cancel(skb, rxsc_nest);
2412 nla_nest_cancel(skb, rxsc_list);
2413 goto nla_put_failure;
2414 }
2415 nla_nest_end(skb, attr);
2416
2417 if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) ||
2418 nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) ||
2419 nla_put_u64(skb, MACSEC_SA_ATTR_KEYID, rx_sa->key.id) ||
2420 nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) {
2421 nla_nest_cancel(skb, rxsa_nest);
2422 nla_nest_cancel(skb, rxsc_nest);
2423 nla_nest_cancel(skb, rxsc_list);
2424 goto nla_put_failure;
2425 }
2426 nla_nest_end(skb, rxsa_nest);
2427 }
2428
2429 nla_nest_end(skb, rxsa_list);
2430 nla_nest_end(skb, rxsc_nest);
2431 }
2432
2433 nla_nest_end(skb, rxsc_list);
2434
c09440f7
SD		 2435 genlmsg_end(skb, hdr);
2436
2437 return 0;
2438
2439nla_put_failure:
c09440f7
SD		 2440 genlmsg_cancel(skb, hdr);
2441 return -EMSGSIZE;
2442}
2443
96cfc505
SD		 2444static int macsec_generation = 1; /* protected by RTNL */
2445
c09440f7
SD		 2446static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb)
2447{
2448 struct net *net = sock_net(skb->sk);
2449 struct net_device *dev;
2450 int dev_idx, d;
2451
2452 dev_idx = cb->args[0];
2453
2454 d = 0;
c10c63ea 2455 rtnl_lock();
96cfc505
SD		 2456
2457 cb->seq = macsec_generation;
2458
c09440f7
SD		 2459 for_each_netdev(net, dev) {
2460 struct macsec_secy *secy;
2461
2462 if (d < dev_idx)
2463 goto next;
2464
2465 if (!netif_is_macsec(dev))
2466 goto next;
2467
2468 secy = &macsec_priv(dev)->secy;
2469 if (dump_secy(secy, dev, skb, cb) < 0)
2470 goto done;
2471next:
2472 d++;
2473 }
2474
2475done:
c10c63ea 2476 rtnl_unlock();
c09440f7
SD		 2477 cb->args[0] = d;
2478 return skb->len;
2479}
2480
2481static const struct genl_ops macsec_genl_ops[] = {
2482 {
2483 .cmd = MACSEC_CMD_GET_TXSC,
2484 .dumpit = macsec_dump_txsc,
2485 .policy = macsec_genl_policy,
2486 },
2487 {
2488 .cmd = MACSEC_CMD_ADD_RXSC,
2489 .doit = macsec_add_rxsc,
2490 .policy = macsec_genl_policy,
2491 .flags = GENL_ADMIN_PERM,
2492 },
2493 {
2494 .cmd = MACSEC_CMD_DEL_RXSC,
2495 .doit = macsec_del_rxsc,
2496 .policy = macsec_genl_policy,
2497 .flags = GENL_ADMIN_PERM,
2498 },
2499 {
2500 .cmd = MACSEC_CMD_UPD_RXSC,
2501 .doit = macsec_upd_rxsc,
2502 .policy = macsec_genl_policy,
2503 .flags = GENL_ADMIN_PERM,
2504 },
2505 {
2506 .cmd = MACSEC_CMD_ADD_TXSA,
2507 .doit = macsec_add_txsa,
2508 .policy = macsec_genl_policy,
2509 .flags = GENL_ADMIN_PERM,
2510 },
2511 {
2512 .cmd = MACSEC_CMD_DEL_TXSA,
2513 .doit = macsec_del_txsa,
2514 .policy = macsec_genl_policy,
2515 .flags = GENL_ADMIN_PERM,
2516 },
2517 {
2518 .cmd = MACSEC_CMD_UPD_TXSA,
2519 .doit = macsec_upd_txsa,
2520 .policy = macsec_genl_policy,
2521 .flags = GENL_ADMIN_PERM,
2522 },
2523 {
2524 .cmd = MACSEC_CMD_ADD_RXSA,
2525 .doit = macsec_add_rxsa,
2526 .policy = macsec_genl_policy,
2527 .flags = GENL_ADMIN_PERM,
2528 },
2529 {
2530 .cmd = MACSEC_CMD_DEL_RXSA,
2531 .doit = macsec_del_rxsa,
2532 .policy = macsec_genl_policy,
2533 .flags = GENL_ADMIN_PERM,
2534 },
2535 {
2536 .cmd = MACSEC_CMD_UPD_RXSA,
2537 .doit = macsec_upd_rxsa,
2538 .policy = macsec_genl_policy,
2539 .flags = GENL_ADMIN_PERM,
2540 },
2541};
2542
2543static netdev_tx_t macsec_start_xmit(struct sk_buff *skb,
2544 struct net_device *dev)
2545{
2546 struct macsec_dev *macsec = netdev_priv(dev);
2547 struct macsec_secy *secy = &macsec->secy;
2548 struct pcpu_secy_stats *secy_stats;
2549 int ret, len;
2550
2551 /* 10.5 */
2552 if (!secy->protect_frames) {
2553 secy_stats = this_cpu_ptr(macsec->stats);
2554 u64_stats_update_begin(&secy_stats->syncp);
2555 secy_stats->stats.OutPktsUntagged++;
2556 u64_stats_update_end(&secy_stats->syncp);
2557 len = skb->len;
2558 ret = dev_queue_xmit(skb);
2559 count_tx(dev, ret, len);
2560 return ret;
2561 }
2562
2563 if (!secy->operational) {
2564 kfree_skb(skb);
2565 dev->stats.tx_dropped++;
2566 return NETDEV_TX_OK;
2567 }
2568
2569 skb = macsec_encrypt(skb, dev);
2570 if (IS_ERR(skb)) {
2571 if (PTR_ERR(skb) != -EINPROGRESS)
2572 dev->stats.tx_dropped++;
2573 return NETDEV_TX_OK;
2574 }
2575
2576 macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa);
2577
2578 macsec_encrypt_finish(skb, dev);
2579 len = skb->len;
2580 ret = dev_queue_xmit(skb);
2581 count_tx(dev, ret, len);
2582 return ret;
2583}
2584
2585#define MACSEC_FEATURES \
2586 (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST)
2587static int macsec_dev_init(struct net_device *dev)
2588{
2589 struct macsec_dev *macsec = macsec_priv(dev);
2590 struct net_device *real_dev = macsec->real_dev;
2591
2592 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2593 if (!dev->tstats)
2594 return -ENOMEM;
2595
2596 dev->features = real_dev->features & MACSEC_FEATURES;
2597 dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2598
2599 dev->needed_headroom = real_dev->needed_headroom +
2600 MACSEC_NEEDED_HEADROOM;
2601 dev->needed_tailroom = real_dev->needed_tailroom +
2602 MACSEC_NEEDED_TAILROOM;
2603
2604 if (is_zero_ether_addr(dev->dev_addr))
2605 eth_hw_addr_inherit(dev, real_dev);
2606 if (is_zero_ether_addr(dev->broadcast))
2607 memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len);
2608
2609 return 0;
2610}
2611
2612static void macsec_dev_uninit(struct net_device *dev)
2613{
2614 free_percpu(dev->tstats);
2615}
2616
2617static netdev_features_t macsec_fix_features(struct net_device *dev,
2618 netdev_features_t features)
2619{
2620 struct macsec_dev *macsec = macsec_priv(dev);
2621 struct net_device *real_dev = macsec->real_dev;
2622
2623 features &= real_dev->features & MACSEC_FEATURES;
2624 features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
2625
2626 return features;
2627}
2628
2629static int macsec_dev_open(struct net_device *dev)
2630{
2631 struct macsec_dev *macsec = macsec_priv(dev);
2632 struct net_device *real_dev = macsec->real_dev;
2633 int err;
2634
2635 if (!(real_dev->flags & IFF_UP))
2636 return -ENETDOWN;
2637
2638 err = dev_uc_add(real_dev, dev->dev_addr);
2639 if (err < 0)
2640 return err;
2641
2642 if (dev->flags & IFF_ALLMULTI) {
2643 err = dev_set_allmulti(real_dev, 1);
2644 if (err < 0)
2645 goto del_unicast;
2646 }
2647
2648 if (dev->flags & IFF_PROMISC) {
2649 err = dev_set_promiscuity(real_dev, 1);
2650 if (err < 0)
2651 goto clear_allmulti;
2652 }
2653
2654 if (netif_carrier_ok(real_dev))
2655 netif_carrier_on(dev);
2656
2657 return 0;
2658clear_allmulti:
2659 if (dev->flags & IFF_ALLMULTI)
2660 dev_set_allmulti(real_dev, -1);
2661del_unicast:
2662 dev_uc_del(real_dev, dev->dev_addr);
2663 netif_carrier_off(dev);
2664 return err;
2665}
2666
2667static int macsec_dev_stop(struct net_device *dev)
2668{
2669 struct macsec_dev *macsec = macsec_priv(dev);
2670 struct net_device *real_dev = macsec->real_dev;
2671
2672 netif_carrier_off(dev);
2673
2674 dev_mc_unsync(real_dev, dev);
2675 dev_uc_unsync(real_dev, dev);
2676
2677 if (dev->flags & IFF_ALLMULTI)
2678 dev_set_allmulti(real_dev, -1);
2679
2680 if (dev->flags & IFF_PROMISC)
2681 dev_set_promiscuity(real_dev, -1);
2682
2683 dev_uc_del(real_dev, dev->dev_addr);
2684
2685 return 0;
2686}
2687
2688static void macsec_dev_change_rx_flags(struct net_device *dev, int change)
2689{
2690 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2691
2692 if (!(dev->flags & IFF_UP))
2693 return;
2694
2695 if (change & IFF_ALLMULTI)
2696 dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1);
2697
2698 if (change & IFF_PROMISC)
2699 dev_set_promiscuity(real_dev,
2700 dev->flags & IFF_PROMISC ? 1 : -1);
2701}
2702
2703static void macsec_dev_set_rx_mode(struct net_device *dev)
2704{
2705 struct net_device *real_dev = macsec_priv(dev)->real_dev;
2706
2707 dev_mc_sync(real_dev, dev);
2708 dev_uc_sync(real_dev, dev);
2709}
2710
2711static int macsec_set_mac_address(struct net_device *dev, void *p)
2712{
2713 struct macsec_dev *macsec = macsec_priv(dev);
2714 struct net_device *real_dev = macsec->real_dev;
2715 struct sockaddr *addr = p;
2716 int err;
2717
2718 if (!is_valid_ether_addr(addr->sa_data))
2719 return -EADDRNOTAVAIL;
2720
2721 if (!(dev->flags & IFF_UP))
2722 goto out;
2723
2724 err = dev_uc_add(real_dev, addr->sa_data);
2725 if (err < 0)
2726 return err;
2727
2728 dev_uc_del(real_dev, dev->dev_addr);
2729
2730out:
2731 ether_addr_copy(dev->dev_addr, addr->sa_data);
2732 return 0;
2733}
2734
2735static int macsec_change_mtu(struct net_device *dev, int new_mtu)
2736{
2737 struct macsec_dev *macsec = macsec_priv(dev);
2738 unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true);
2739
2740 if (macsec->real_dev->mtu - extra < new_mtu)
2741 return -ERANGE;
2742
2743 dev->mtu = new_mtu;
2744
2745 return 0;
2746}
2747
2748static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev,
2749 struct rtnl_link_stats64 *s)
2750{
2751 int cpu;
2752
2753 if (!dev->tstats)
2754 return s;
2755
2756 for_each_possible_cpu(cpu) {
2757 struct pcpu_sw_netstats *stats;
2758 struct pcpu_sw_netstats tmp;
2759 int start;
2760
2761 stats = per_cpu_ptr(dev->tstats, cpu);
2762 do {
2763 start = u64_stats_fetch_begin_irq(&stats->syncp);
2764 tmp.rx_packets = stats->rx_packets;
2765 tmp.rx_bytes = stats->rx_bytes;
2766 tmp.tx_packets = stats->tx_packets;
2767 tmp.tx_bytes = stats->tx_bytes;
2768 } while (u64_stats_fetch_retry_irq(&stats->syncp, start));
2769
2770 s->rx_packets += tmp.rx_packets;
2771 s->rx_bytes += tmp.rx_bytes;
2772 s->tx_packets += tmp.tx_packets;
2773 s->tx_bytes += tmp.tx_bytes;
2774 }
2775
2776 s->rx_dropped = dev->stats.rx_dropped;
2777 s->tx_dropped = dev->stats.tx_dropped;
2778
2779 return s;
2780}
2781
2782static int macsec_get_iflink(const struct net_device *dev)
2783{
2784 return macsec_priv(dev)->real_dev->ifindex;
2785}
2786
2787static const struct net_device_ops macsec_netdev_ops = {
2788 .ndo_init = macsec_dev_init,
2789 .ndo_uninit = macsec_dev_uninit,
2790 .ndo_open = macsec_dev_open,
2791 .ndo_stop = macsec_dev_stop,
2792 .ndo_fix_features = macsec_fix_features,
2793 .ndo_change_mtu = macsec_change_mtu,
2794 .ndo_set_rx_mode = macsec_dev_set_rx_mode,
2795 .ndo_change_rx_flags = macsec_dev_change_rx_flags,
2796 .ndo_set_mac_address = macsec_set_mac_address,
2797 .ndo_start_xmit = macsec_start_xmit,
2798 .ndo_get_stats64 = macsec_get_stats64,
2799 .ndo_get_iflink = macsec_get_iflink,
2800};
2801
2802static const struct device_type macsec_type = {
2803 .name = "macsec",
2804};
2805
2806static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = {
2807 [IFLA_MACSEC_SCI] = { .type = NLA_U64 },
2808 [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 },
2809 [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 },
2810 [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 },
2811 [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 },
2812 [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 },
2813 [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 },
2814 [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 },
2815 [IFLA_MACSEC_ES] = { .type = NLA_U8 },
2816 [IFLA_MACSEC_SCB] = { .type = NLA_U8 },
2817 [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 },
2818 [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 },
2819};
2820
2821static void macsec_free_netdev(struct net_device *dev)
2822{
2823 struct macsec_dev *macsec = macsec_priv(dev);
2824 struct net_device *real_dev = macsec->real_dev;
2825
2826 free_percpu(macsec->stats);
2827 free_percpu(macsec->secy.tx_sc.stats);
2828
2829 dev_put(real_dev);
2830 free_netdev(dev);
2831}
2832
2833static void macsec_setup(struct net_device *dev)
2834{
2835 ether_setup(dev);
2836 dev->tx_queue_len = 0;
2837 dev->netdev_ops = &macsec_netdev_ops;
2838 dev->destructor = macsec_free_netdev;
2839
2840 eth_zero_addr(dev->broadcast);
2841}
2842
2843static void macsec_changelink_common(struct net_device *dev,
2844 struct nlattr *data[])
2845{
2846 struct macsec_secy *secy;
2847 struct macsec_tx_sc *tx_sc;
2848
2849 secy = &macsec_priv(dev)->secy;
2850 tx_sc = &secy->tx_sc;
2851
2852 if (data[IFLA_MACSEC_ENCODING_SA]) {
2853 struct macsec_tx_sa *tx_sa;
2854
2855 tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]);
2856 tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]);
2857
2858 secy->operational = tx_sa && tx_sa->active;
2859 }
2860
2861 if (data[IFLA_MACSEC_WINDOW])
2862 secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]);
2863
2864 if (data[IFLA_MACSEC_ENCRYPT])
2865 tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]);
2866
2867 if (data[IFLA_MACSEC_PROTECT])
2868 secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]);
2869
2870 if (data[IFLA_MACSEC_INC_SCI])
2871 tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]);
2872
2873 if (data[IFLA_MACSEC_ES])
2874 tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]);
2875
2876 if (data[IFLA_MACSEC_SCB])
2877 tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]);
2878
2879 if (data[IFLA_MACSEC_REPLAY_PROTECT])
2880 secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]);
2881
2882 if (data[IFLA_MACSEC_VALIDATION])
2883 secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]);
2884}
2885
2886static int macsec_changelink(struct net_device *dev, struct nlattr *tb[],
2887 struct nlattr *data[])
2888{
2889 if (!data)
2890 return 0;
2891
2892 if (data[IFLA_MACSEC_CIPHER_SUITE] ||
2893 data[IFLA_MACSEC_ICV_LEN] ||
2894 data[IFLA_MACSEC_SCI] ||
2895 data[IFLA_MACSEC_PORT])
2896 return -EINVAL;
2897
2898 macsec_changelink_common(dev, data);
2899
2900 return 0;
2901}
2902
2903static void macsec_del_dev(struct macsec_dev *macsec)
2904{
2905 int i;
2906
2907 while (macsec->secy.rx_sc) {
2908 struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc);
2909
2910 rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next);
2911 free_rx_sc(rx_sc);
2912 }
2913
2914 for (i = 0; i < MACSEC_NUM_AN; i++) {
2915 struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]);
2916
2917 if (sa) {
2918 RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL);
2919 clear_tx_sa(sa);
2920 }
2921 }
2922}
2923
2924static void macsec_dellink(struct net_device *dev, struct list_head *head)
2925{
2926 struct macsec_dev *macsec = macsec_priv(dev);
2927 struct net_device *real_dev = macsec->real_dev;
2928 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2929
96cfc505
SD		 2930 macsec_generation++;
2931
c09440f7
SD		 2932 unregister_netdevice_queue(dev, head);
2933 list_del_rcu(&macsec->secys);
2934 if (list_empty(&rxd->secys))
2935 netdev_rx_handler_unregister(real_dev);
2936
2937 macsec_del_dev(macsec);
2938}
2939
2940static int register_macsec_dev(struct net_device *real_dev,
2941 struct net_device *dev)
2942{
2943 struct macsec_dev *macsec = macsec_priv(dev);
2944 struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev);
2945
2946 if (!rxd) {
2947 int err;
2948
2949 rxd = kmalloc(sizeof(*rxd), GFP_KERNEL);
2950 if (!rxd)
2951 return -ENOMEM;
2952
2953 INIT_LIST_HEAD(&rxd->secys);
2954
2955 err = netdev_rx_handler_register(real_dev, macsec_handle_frame,
2956 rxd);
2957 if (err < 0)
2958 return err;
2959 }
2960
2961 list_add_tail_rcu(&macsec->secys, &rxd->secys);
2962 return 0;
2963}
2964
2965static bool sci_exists(struct net_device *dev, sci_t sci)
2966{
2967 struct macsec_rxh_data *rxd = macsec_data_rtnl(dev);
2968 struct macsec_dev *macsec;
2969
2970 list_for_each_entry(macsec, &rxd->secys, secys) {
2971 if (macsec->secy.sci == sci)
2972 return true;
2973 }
2974
2975 return false;
2976}
2977
2978static sci_t dev_to_sci(struct net_device *dev, __be16 port)
2979{
2980 return make_sci(dev->dev_addr, port);
2981}
2982
2983static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len)
2984{
2985 struct macsec_dev *macsec = macsec_priv(dev);
2986 struct macsec_secy *secy = &macsec->secy;
2987
2988 macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats);
2989 if (!macsec->stats)
2990 return -ENOMEM;
2991
2992 secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats);
2993 if (!secy->tx_sc.stats) {
2994 free_percpu(macsec->stats);
2995 return -ENOMEM;
2996 }
2997
2998 if (sci == MACSEC_UNDEF_SCI)
2999 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3000
3001 secy->netdev = dev;
3002 secy->operational = true;
3003 secy->key_len = DEFAULT_SAK_LEN;
3004 secy->icv_len = icv_len;
3005 secy->validate_frames = MACSEC_VALIDATE_DEFAULT;
3006 secy->protect_frames = true;
3007 secy->replay_protect = false;
3008
3009 secy->sci = sci;
3010 secy->tx_sc.active = true;
3011 secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA;
3012 secy->tx_sc.encrypt = DEFAULT_ENCRYPT;
3013 secy->tx_sc.send_sci = DEFAULT_SEND_SCI;
3014 secy->tx_sc.end_station = false;
3015 secy->tx_sc.scb = false;
3016
3017 return 0;
3018}
3019
3020static int macsec_newlink(struct net *net, struct net_device *dev,
3021 struct nlattr *tb[], struct nlattr *data[])
3022{
3023 struct macsec_dev *macsec = macsec_priv(dev);
3024 struct net_device *real_dev;
3025 int err;
3026 sci_t sci;
3027 u8 icv_len = DEFAULT_ICV_LEN;
3028 rx_handler_func_t *rx_handler;
3029
3030 if (!tb[IFLA_LINK])
3031 return -EINVAL;
3032 real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK]));
3033 if (!real_dev)
3034 return -ENODEV;
3035
3036 dev->priv_flags |= IFF_MACSEC;
3037
3038 macsec->real_dev = real_dev;
3039
3040 if (data && data[IFLA_MACSEC_ICV_LEN])
3041 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3042 dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true);
3043
3044 rx_handler = rtnl_dereference(real_dev->rx_handler);
3045 if (rx_handler && rx_handler != macsec_handle_frame)
3046 return -EBUSY;
3047
3048 err = register_netdevice(dev);
3049 if (err < 0)
3050 return err;
3051
3052 /* need to be already registered so that ->init has run and
3053 * the MAC addr is set
3054 */
3055 if (data && data[IFLA_MACSEC_SCI])
3056 sci = nla_get_sci(data[IFLA_MACSEC_SCI]);
3057 else if (data && data[IFLA_MACSEC_PORT])
3058 sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT]));
3059 else
3060 sci = dev_to_sci(dev, MACSEC_PORT_ES);
3061
3062 if (rx_handler && sci_exists(real_dev, sci)) {
3063 err = -EBUSY;
3064 goto unregister;
3065 }
3066
3067 err = macsec_add_dev(dev, sci, icv_len);
3068 if (err)
3069 goto unregister;
3070
3071 if (data)
3072 macsec_changelink_common(dev, data);
3073
3074 err = register_macsec_dev(real_dev, dev);
3075 if (err < 0)
3076 goto del_dev;
3077
96cfc505
SD		 3078 macsec_generation++;
3079
c09440f7
SD		 3080 dev_hold(real_dev);
3081
3082 return 0;
3083
3084del_dev:
3085 macsec_del_dev(macsec);
3086unregister:
3087 unregister_netdevice(dev);
3088 return err;
3089}
3090
3091static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[])
3092{
3093 u64 csid = DEFAULT_CIPHER_ID;
3094 u8 icv_len = DEFAULT_ICV_LEN;
3095 int flag;
3096 bool es, scb, sci;
3097
3098 if (!data)
3099 return 0;
3100
3101 if (data[IFLA_MACSEC_CIPHER_SUITE])
3102 csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]);
3103
3104 if (data[IFLA_MACSEC_ICV_LEN])
3105 icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]);
3106
3107 switch (csid) {
3108 case DEFAULT_CIPHER_ID:
3109 case DEFAULT_CIPHER_ALT:
3110 if (icv_len < MACSEC_MIN_ICV_LEN ||
3111 icv_len > MACSEC_MAX_ICV_LEN)
3112 return -EINVAL;
3113 break;
3114 default:
3115 return -EINVAL;
3116 }
3117
3118 if (data[IFLA_MACSEC_ENCODING_SA]) {
3119 if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN)
3120 return -EINVAL;
3121 }
3122
3123 for (flag = IFLA_MACSEC_ENCODING_SA + 1;
3124 flag < IFLA_MACSEC_VALIDATION;
3125 flag++) {
3126 if (data[flag]) {
3127 if (nla_get_u8(data[flag]) > 1)
3128 return -EINVAL;
3129 }
3130 }
3131
3132 es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false;
3133 sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false;
3134 scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false;
3135
3136 if ((sci && (scb || es)) || (scb && es))
3137 return -EINVAL;
3138
3139 if (data[IFLA_MACSEC_VALIDATION] &&
3140 nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX)
3141 return -EINVAL;
3142
3143 if ((data[IFLA_MACSEC_PROTECT] &&
3144 nla_get_u8(data[IFLA_MACSEC_PROTECT])) &&
3145 !data[IFLA_MACSEC_WINDOW])
3146 return -EINVAL;
3147
3148 return 0;
3149}
3150
3151static struct net *macsec_get_link_net(const struct net_device *dev)
3152{
3153 return dev_net(macsec_priv(dev)->real_dev);
3154}
3155
3156static size_t macsec_get_size(const struct net_device *dev)
3157{
3158 return 0 +
3159 nla_total_size(8) + /* SCI */
3160 nla_total_size(1) + /* ICV_LEN */
3161 nla_total_size(8) + /* CIPHER_SUITE */
3162 nla_total_size(4) + /* WINDOW */
3163 nla_total_size(1) + /* ENCODING_SA */
3164 nla_total_size(1) + /* ENCRYPT */
3165 nla_total_size(1) + /* PROTECT */
3166 nla_total_size(1) + /* INC_SCI */
3167 nla_total_size(1) + /* ES */
3168 nla_total_size(1) + /* SCB */
3169 nla_total_size(1) + /* REPLAY_PROTECT */
3170 nla_total_size(1) + /* VALIDATION */
3171 0;
3172}
3173
3174static int macsec_fill_info(struct sk_buff *skb,
3175 const struct net_device *dev)
3176{
3177 struct macsec_secy *secy = &macsec_priv(dev)->secy;
3178 struct macsec_tx_sc *tx_sc = &secy->tx_sc;
3179
3180 if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci) ||
3181 nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) ||
3182 nla_put_u64(skb, IFLA_MACSEC_CIPHER_SUITE, DEFAULT_CIPHER_ID) ||
3183 nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) ||
3184 nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) ||
3185 nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) ||
3186 nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) ||
3187 nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) ||
3188 nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) ||
3189 nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) ||
3190 nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) ||
3191 0)
3192 goto nla_put_failure;
3193
3194 if (secy->replay_protect) {
3195 if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window))
3196 goto nla_put_failure;
3197 }
3198
3199 return 0;
3200
3201nla_put_failure:
3202 return -EMSGSIZE;
3203}
3204
3205static struct rtnl_link_ops macsec_link_ops __read_mostly = {
3206 .kind = "macsec",
3207 .priv_size = sizeof(struct macsec_dev),
3208 .maxtype = IFLA_MACSEC_MAX,
3209 .policy = macsec_rtnl_policy,
3210 .setup = macsec_setup,
3211 .validate = macsec_validate_attr,
3212 .newlink = macsec_newlink,
3213 .changelink = macsec_changelink,
3214 .dellink = macsec_dellink,
3215 .get_size = macsec_get_size,
3216 .fill_info = macsec_fill_info,
3217 .get_link_net = macsec_get_link_net,
3218};
3219
3220static bool is_macsec_master(struct net_device *dev)
3221{
3222 return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame;
3223}
3224
3225static int macsec_notify(struct notifier_block *this, unsigned long event,
3226 void *ptr)
3227{
3228 struct net_device *real_dev = netdev_notifier_info_to_dev(ptr);
3229 LIST_HEAD(head);
3230
3231 if (!is_macsec_master(real_dev))
3232 return NOTIFY_DONE;
3233
3234 switch (event) {
3235 case NETDEV_UNREGISTER: {
3236 struct macsec_dev *m, *n;
3237 struct macsec_rxh_data *rxd;
3238
3239 rxd = macsec_data_rtnl(real_dev);
3240 list_for_each_entry_safe(m, n, &rxd->secys, secys) {
3241 macsec_dellink(m->secy.netdev, &head);
3242 }
3243 unregister_netdevice_many(&head);
3244 break;
3245 }
3246 case NETDEV_CHANGEMTU: {
3247 struct macsec_dev *m;
3248 struct macsec_rxh_data *rxd;
3249
3250 rxd = macsec_data_rtnl(real_dev);
3251 list_for_each_entry(m, &rxd->secys, secys) {
3252 struct net_device *dev = m->secy.netdev;
3253 unsigned int mtu = real_dev->mtu - (m->secy.icv_len +
3254 macsec_extra_len(true));
3255
3256 if (dev->mtu > mtu)
3257 dev_set_mtu(dev, mtu);
3258 }
3259 }
3260 }
3261
3262 return NOTIFY_OK;
3263}
3264
3265static struct notifier_block macsec_notifier = {
3266 .notifier_call = macsec_notify,
3267};
3268
3269static int __init macsec_init(void)
3270{
3271 int err;
3272
3273 pr_info("MACsec IEEE 802.1AE\n");
3274 err = register_netdevice_notifier(&macsec_notifier);
3275 if (err)
3276 return err;
3277
3278 err = rtnl_link_register(&macsec_link_ops);
3279 if (err)
3280 goto notifier;
3281
3282 err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops);
3283 if (err)
3284 goto rtnl;
3285
3286 return 0;
3287
3288rtnl:
3289 rtnl_link_unregister(&macsec_link_ops);
3290notifier:
3291 unregister_netdevice_notifier(&macsec_notifier);
3292 return err;
3293}
3294
3295static void __exit macsec_exit(void)
3296{
3297 genl_unregister_family(&macsec_fam);
3298 rtnl_link_unregister(&macsec_link_ops);
3299 unregister_netdevice_notifier(&macsec_notifier);
3300}
3301
3302module_init(macsec_init);
3303module_exit(macsec_exit);
3304
3305MODULE_ALIAS_RTNL_LINK("macsec");
3306
3307MODULE_DESCRIPTION("MACsec IEEE 802.1AE");
3308MODULE_LICENSE("GPL v2");
Linux 6.x block layer and io_uring tree(s)