Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 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> |
Paolo Abeni | 5491e7c | 2016-07-20 18:11:32 +0200 | [diff] [blame] | 21 | #include <net/gro_cells.h> |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 22 | |
| 23 | #include <uapi/linux/if_macsec.h> |
| 24 | |
| 25 | typedef u64 __bitwise sci_t; |
| 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 | |
| 32 | struct 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 MACSEC_NUM_AN 4 /* 2 bits for the association number */ |
| 65 | |
| 66 | #define for_each_rxsc(secy, sc) \ |
| 67 | for (sc = rcu_dereference_bh(secy->rx_sc); \ |
| 68 | sc; \ |
| 69 | sc = rcu_dereference_bh(sc->next)) |
| 70 | #define for_each_rxsc_rtnl(secy, sc) \ |
| 71 | for (sc = rtnl_dereference(secy->rx_sc); \ |
| 72 | sc; \ |
| 73 | sc = rtnl_dereference(sc->next)) |
| 74 | |
| 75 | struct gcm_iv { |
| 76 | union { |
| 77 | u8 secure_channel_id[8]; |
| 78 | sci_t sci; |
| 79 | }; |
| 80 | __be32 pn; |
| 81 | }; |
| 82 | |
| 83 | /** |
| 84 | * struct macsec_key - SA key |
| 85 | * @id: user-provided key identifier |
| 86 | * @tfm: crypto struct, key storage |
| 87 | */ |
| 88 | struct macsec_key { |
Sabrina Dubroca | 8acca6a | 2016-05-07 20:19:29 +0200 | [diff] [blame] | 89 | u8 id[MACSEC_KEYID_LEN]; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 90 | struct crypto_aead *tfm; |
| 91 | }; |
| 92 | |
| 93 | struct macsec_rx_sc_stats { |
| 94 | __u64 InOctetsValidated; |
| 95 | __u64 InOctetsDecrypted; |
| 96 | __u64 InPktsUnchecked; |
| 97 | __u64 InPktsDelayed; |
| 98 | __u64 InPktsOK; |
| 99 | __u64 InPktsInvalid; |
| 100 | __u64 InPktsLate; |
| 101 | __u64 InPktsNotValid; |
| 102 | __u64 InPktsNotUsingSA; |
| 103 | __u64 InPktsUnusedSA; |
| 104 | }; |
| 105 | |
| 106 | struct macsec_rx_sa_stats { |
| 107 | __u32 InPktsOK; |
| 108 | __u32 InPktsInvalid; |
| 109 | __u32 InPktsNotValid; |
| 110 | __u32 InPktsNotUsingSA; |
| 111 | __u32 InPktsUnusedSA; |
| 112 | }; |
| 113 | |
| 114 | struct macsec_tx_sa_stats { |
| 115 | __u32 OutPktsProtected; |
| 116 | __u32 OutPktsEncrypted; |
| 117 | }; |
| 118 | |
| 119 | struct macsec_tx_sc_stats { |
| 120 | __u64 OutPktsProtected; |
| 121 | __u64 OutPktsEncrypted; |
| 122 | __u64 OutOctetsProtected; |
| 123 | __u64 OutOctetsEncrypted; |
| 124 | }; |
| 125 | |
| 126 | struct macsec_dev_stats { |
| 127 | __u64 OutPktsUntagged; |
| 128 | __u64 InPktsUntagged; |
| 129 | __u64 OutPktsTooLong; |
| 130 | __u64 InPktsNoTag; |
| 131 | __u64 InPktsBadTag; |
| 132 | __u64 InPktsUnknownSCI; |
| 133 | __u64 InPktsNoSCI; |
| 134 | __u64 InPktsOverrun; |
| 135 | }; |
| 136 | |
| 137 | /** |
| 138 | * struct macsec_rx_sa - receive secure association |
| 139 | * @active: |
| 140 | * @next_pn: packet number expected for the next packet |
| 141 | * @lock: protects next_pn manipulations |
| 142 | * @key: key structure |
| 143 | * @stats: per-SA stats |
| 144 | */ |
| 145 | struct macsec_rx_sa { |
| 146 | struct macsec_key key; |
| 147 | spinlock_t lock; |
| 148 | u32 next_pn; |
| 149 | atomic_t refcnt; |
| 150 | bool active; |
| 151 | struct macsec_rx_sa_stats __percpu *stats; |
| 152 | struct macsec_rx_sc *sc; |
| 153 | struct rcu_head rcu; |
| 154 | }; |
| 155 | |
| 156 | struct pcpu_rx_sc_stats { |
| 157 | struct macsec_rx_sc_stats stats; |
| 158 | struct u64_stats_sync syncp; |
| 159 | }; |
| 160 | |
| 161 | /** |
| 162 | * struct macsec_rx_sc - receive secure channel |
| 163 | * @sci: secure channel identifier for this SC |
| 164 | * @active: channel is active |
| 165 | * @sa: array of secure associations |
| 166 | * @stats: per-SC stats |
| 167 | */ |
| 168 | struct macsec_rx_sc { |
| 169 | struct macsec_rx_sc __rcu *next; |
| 170 | sci_t sci; |
| 171 | bool active; |
| 172 | struct macsec_rx_sa __rcu *sa[MACSEC_NUM_AN]; |
| 173 | struct pcpu_rx_sc_stats __percpu *stats; |
| 174 | atomic_t refcnt; |
| 175 | struct rcu_head rcu_head; |
| 176 | }; |
| 177 | |
| 178 | /** |
| 179 | * struct macsec_tx_sa - transmit secure association |
| 180 | * @active: |
| 181 | * @next_pn: packet number to use for the next packet |
| 182 | * @lock: protects next_pn manipulations |
| 183 | * @key: key structure |
| 184 | * @stats: per-SA stats |
| 185 | */ |
| 186 | struct macsec_tx_sa { |
| 187 | struct macsec_key key; |
| 188 | spinlock_t lock; |
| 189 | u32 next_pn; |
| 190 | atomic_t refcnt; |
| 191 | bool active; |
| 192 | struct macsec_tx_sa_stats __percpu *stats; |
| 193 | struct rcu_head rcu; |
| 194 | }; |
| 195 | |
| 196 | struct pcpu_tx_sc_stats { |
| 197 | struct macsec_tx_sc_stats stats; |
| 198 | struct u64_stats_sync syncp; |
| 199 | }; |
| 200 | |
| 201 | /** |
| 202 | * struct macsec_tx_sc - transmit secure channel |
| 203 | * @active: |
| 204 | * @encoding_sa: association number of the SA currently in use |
| 205 | * @encrypt: encrypt packets on transmit, or authenticate only |
| 206 | * @send_sci: always include the SCI in the SecTAG |
| 207 | * @end_station: |
| 208 | * @scb: single copy broadcast flag |
| 209 | * @sa: array of secure associations |
| 210 | * @stats: stats for this TXSC |
| 211 | */ |
| 212 | struct macsec_tx_sc { |
| 213 | bool active; |
| 214 | u8 encoding_sa; |
| 215 | bool encrypt; |
| 216 | bool send_sci; |
| 217 | bool end_station; |
| 218 | bool scb; |
| 219 | struct macsec_tx_sa __rcu *sa[MACSEC_NUM_AN]; |
| 220 | struct pcpu_tx_sc_stats __percpu *stats; |
| 221 | }; |
| 222 | |
| 223 | #define MACSEC_VALIDATE_DEFAULT MACSEC_VALIDATE_STRICT |
| 224 | |
| 225 | /** |
| 226 | * struct macsec_secy - MACsec Security Entity |
| 227 | * @netdev: netdevice for this SecY |
| 228 | * @n_rx_sc: number of receive secure channels configured on this SecY |
| 229 | * @sci: secure channel identifier used for tx |
| 230 | * @key_len: length of keys used by the cipher suite |
| 231 | * @icv_len: length of ICV used by the cipher suite |
| 232 | * @validate_frames: validation mode |
| 233 | * @operational: MAC_Operational flag |
| 234 | * @protect_frames: enable protection for this SecY |
| 235 | * @replay_protect: enable packet number checks on receive |
| 236 | * @replay_window: size of the replay window |
| 237 | * @tx_sc: transmit secure channel |
| 238 | * @rx_sc: linked list of receive secure channels |
| 239 | */ |
| 240 | struct macsec_secy { |
| 241 | struct net_device *netdev; |
| 242 | unsigned int n_rx_sc; |
| 243 | sci_t sci; |
| 244 | u16 key_len; |
| 245 | u16 icv_len; |
| 246 | enum macsec_validation_type validate_frames; |
| 247 | bool operational; |
| 248 | bool protect_frames; |
| 249 | bool replay_protect; |
| 250 | u32 replay_window; |
| 251 | struct macsec_tx_sc tx_sc; |
| 252 | struct macsec_rx_sc __rcu *rx_sc; |
| 253 | }; |
| 254 | |
| 255 | struct pcpu_secy_stats { |
| 256 | struct macsec_dev_stats stats; |
| 257 | struct u64_stats_sync syncp; |
| 258 | }; |
| 259 | |
| 260 | /** |
| 261 | * struct macsec_dev - private data |
| 262 | * @secy: SecY config |
| 263 | * @real_dev: pointer to underlying netdevice |
| 264 | * @stats: MACsec device stats |
| 265 | * @secys: linked list of SecY's on the underlying device |
| 266 | */ |
| 267 | struct macsec_dev { |
| 268 | struct macsec_secy secy; |
| 269 | struct net_device *real_dev; |
| 270 | struct pcpu_secy_stats __percpu *stats; |
| 271 | struct list_head secys; |
Paolo Abeni | 5491e7c | 2016-07-20 18:11:32 +0200 | [diff] [blame] | 272 | struct gro_cells gro_cells; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 273 | }; |
| 274 | |
| 275 | /** |
| 276 | * struct macsec_rxh_data - rx_handler private argument |
| 277 | * @secys: linked list of SecY's on this underlying device |
| 278 | */ |
| 279 | struct macsec_rxh_data { |
| 280 | struct list_head secys; |
| 281 | }; |
| 282 | |
| 283 | static struct macsec_dev *macsec_priv(const struct net_device *dev) |
| 284 | { |
| 285 | return (struct macsec_dev *)netdev_priv(dev); |
| 286 | } |
| 287 | |
| 288 | static struct macsec_rxh_data *macsec_data_rcu(const struct net_device *dev) |
| 289 | { |
| 290 | return rcu_dereference_bh(dev->rx_handler_data); |
| 291 | } |
| 292 | |
| 293 | static struct macsec_rxh_data *macsec_data_rtnl(const struct net_device *dev) |
| 294 | { |
| 295 | return rtnl_dereference(dev->rx_handler_data); |
| 296 | } |
| 297 | |
| 298 | struct macsec_cb { |
| 299 | struct aead_request *req; |
| 300 | union { |
| 301 | struct macsec_tx_sa *tx_sa; |
| 302 | struct macsec_rx_sa *rx_sa; |
| 303 | }; |
| 304 | u8 assoc_num; |
| 305 | bool valid; |
| 306 | bool has_sci; |
| 307 | }; |
| 308 | |
| 309 | static struct macsec_rx_sa *macsec_rxsa_get(struct macsec_rx_sa __rcu *ptr) |
| 310 | { |
| 311 | struct macsec_rx_sa *sa = rcu_dereference_bh(ptr); |
| 312 | |
| 313 | if (!sa || !sa->active) |
| 314 | return NULL; |
| 315 | |
| 316 | if (!atomic_inc_not_zero(&sa->refcnt)) |
| 317 | return NULL; |
| 318 | |
| 319 | return sa; |
| 320 | } |
| 321 | |
| 322 | static void free_rx_sc_rcu(struct rcu_head *head) |
| 323 | { |
| 324 | struct macsec_rx_sc *rx_sc = container_of(head, struct macsec_rx_sc, rcu_head); |
| 325 | |
| 326 | free_percpu(rx_sc->stats); |
| 327 | kfree(rx_sc); |
| 328 | } |
| 329 | |
| 330 | static struct macsec_rx_sc *macsec_rxsc_get(struct macsec_rx_sc *sc) |
| 331 | { |
| 332 | return atomic_inc_not_zero(&sc->refcnt) ? sc : NULL; |
| 333 | } |
| 334 | |
| 335 | static void macsec_rxsc_put(struct macsec_rx_sc *sc) |
| 336 | { |
| 337 | if (atomic_dec_and_test(&sc->refcnt)) |
| 338 | call_rcu(&sc->rcu_head, free_rx_sc_rcu); |
| 339 | } |
| 340 | |
| 341 | static void free_rxsa(struct rcu_head *head) |
| 342 | { |
| 343 | struct macsec_rx_sa *sa = container_of(head, struct macsec_rx_sa, rcu); |
| 344 | |
| 345 | crypto_free_aead(sa->key.tfm); |
| 346 | free_percpu(sa->stats); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 347 | kfree(sa); |
| 348 | } |
| 349 | |
| 350 | static void macsec_rxsa_put(struct macsec_rx_sa *sa) |
| 351 | { |
| 352 | if (atomic_dec_and_test(&sa->refcnt)) |
| 353 | call_rcu(&sa->rcu, free_rxsa); |
| 354 | } |
| 355 | |
| 356 | static struct macsec_tx_sa *macsec_txsa_get(struct macsec_tx_sa __rcu *ptr) |
| 357 | { |
| 358 | struct macsec_tx_sa *sa = rcu_dereference_bh(ptr); |
| 359 | |
| 360 | if (!sa || !sa->active) |
| 361 | return NULL; |
| 362 | |
| 363 | if (!atomic_inc_not_zero(&sa->refcnt)) |
| 364 | return NULL; |
| 365 | |
| 366 | return sa; |
| 367 | } |
| 368 | |
| 369 | static void free_txsa(struct rcu_head *head) |
| 370 | { |
| 371 | struct macsec_tx_sa *sa = container_of(head, struct macsec_tx_sa, rcu); |
| 372 | |
| 373 | crypto_free_aead(sa->key.tfm); |
| 374 | free_percpu(sa->stats); |
| 375 | kfree(sa); |
| 376 | } |
| 377 | |
| 378 | static void macsec_txsa_put(struct macsec_tx_sa *sa) |
| 379 | { |
| 380 | if (atomic_dec_and_test(&sa->refcnt)) |
| 381 | call_rcu(&sa->rcu, free_txsa); |
| 382 | } |
| 383 | |
| 384 | static struct macsec_cb *macsec_skb_cb(struct sk_buff *skb) |
| 385 | { |
| 386 | BUILD_BUG_ON(sizeof(struct macsec_cb) > sizeof(skb->cb)); |
| 387 | return (struct macsec_cb *)skb->cb; |
| 388 | } |
| 389 | |
| 390 | #define MACSEC_PORT_ES (htons(0x0001)) |
| 391 | #define MACSEC_PORT_SCB (0x0000) |
| 392 | #define MACSEC_UNDEF_SCI ((__force sci_t)0xffffffffffffffffULL) |
| 393 | |
| 394 | #define DEFAULT_SAK_LEN 16 |
| 395 | #define DEFAULT_SEND_SCI true |
| 396 | #define DEFAULT_ENCRYPT false |
| 397 | #define DEFAULT_ENCODING_SA 0 |
| 398 | |
| 399 | static sci_t make_sci(u8 *addr, __be16 port) |
| 400 | { |
| 401 | sci_t sci; |
| 402 | |
| 403 | memcpy(&sci, addr, ETH_ALEN); |
| 404 | memcpy(((char *)&sci) + ETH_ALEN, &port, sizeof(port)); |
| 405 | |
| 406 | return sci; |
| 407 | } |
| 408 | |
| 409 | static sci_t macsec_frame_sci(struct macsec_eth_header *hdr, bool sci_present) |
| 410 | { |
| 411 | sci_t sci; |
| 412 | |
| 413 | if (sci_present) |
| 414 | memcpy(&sci, hdr->secure_channel_id, |
| 415 | sizeof(hdr->secure_channel_id)); |
| 416 | else |
| 417 | sci = make_sci(hdr->eth.h_source, MACSEC_PORT_ES); |
| 418 | |
| 419 | return sci; |
| 420 | } |
| 421 | |
| 422 | static unsigned int macsec_sectag_len(bool sci_present) |
| 423 | { |
| 424 | return MACSEC_TAG_LEN + (sci_present ? MACSEC_SCI_LEN : 0); |
| 425 | } |
| 426 | |
| 427 | static unsigned int macsec_hdr_len(bool sci_present) |
| 428 | { |
| 429 | return macsec_sectag_len(sci_present) + ETH_HLEN; |
| 430 | } |
| 431 | |
| 432 | static unsigned int macsec_extra_len(bool sci_present) |
| 433 | { |
| 434 | return macsec_sectag_len(sci_present) + sizeof(__be16); |
| 435 | } |
| 436 | |
| 437 | /* Fill SecTAG according to IEEE 802.1AE-2006 10.5.3 */ |
| 438 | static void macsec_fill_sectag(struct macsec_eth_header *h, |
| 439 | const struct macsec_secy *secy, u32 pn) |
| 440 | { |
| 441 | const struct macsec_tx_sc *tx_sc = &secy->tx_sc; |
| 442 | |
| 443 | memset(&h->tci_an, 0, macsec_sectag_len(tx_sc->send_sci)); |
| 444 | h->eth.h_proto = htons(ETH_P_MACSEC); |
| 445 | |
| 446 | if (tx_sc->send_sci || |
| 447 | (secy->n_rx_sc > 1 && !tx_sc->end_station && !tx_sc->scb)) { |
| 448 | h->tci_an |= MACSEC_TCI_SC; |
| 449 | memcpy(&h->secure_channel_id, &secy->sci, |
| 450 | sizeof(h->secure_channel_id)); |
| 451 | } else { |
| 452 | if (tx_sc->end_station) |
| 453 | h->tci_an |= MACSEC_TCI_ES; |
| 454 | if (tx_sc->scb) |
| 455 | h->tci_an |= MACSEC_TCI_SCB; |
| 456 | } |
| 457 | |
| 458 | h->packet_number = htonl(pn); |
| 459 | |
| 460 | /* with GCM, C/E clear for !encrypt, both set for encrypt */ |
| 461 | if (tx_sc->encrypt) |
| 462 | h->tci_an |= MACSEC_TCI_CONFID; |
| 463 | else if (secy->icv_len != DEFAULT_ICV_LEN) |
| 464 | h->tci_an |= MACSEC_TCI_C; |
| 465 | |
| 466 | h->tci_an |= tx_sc->encoding_sa; |
| 467 | } |
| 468 | |
| 469 | static void macsec_set_shortlen(struct macsec_eth_header *h, size_t data_len) |
| 470 | { |
| 471 | if (data_len < MIN_NON_SHORT_LEN) |
| 472 | h->short_length = data_len; |
| 473 | } |
| 474 | |
| 475 | /* validate MACsec packet according to IEEE 802.1AE-2006 9.12 */ |
| 476 | static bool macsec_validate_skb(struct sk_buff *skb, u16 icv_len) |
| 477 | { |
| 478 | struct macsec_eth_header *h = (struct macsec_eth_header *)skb->data; |
| 479 | int len = skb->len - 2 * ETH_ALEN; |
| 480 | int extra_len = macsec_extra_len(!!(h->tci_an & MACSEC_TCI_SC)) + icv_len; |
| 481 | |
| 482 | /* a) It comprises at least 17 octets */ |
| 483 | if (skb->len <= 16) |
| 484 | return false; |
| 485 | |
| 486 | /* b) MACsec EtherType: already checked */ |
| 487 | |
| 488 | /* c) V bit is clear */ |
| 489 | if (h->tci_an & MACSEC_TCI_VERSION) |
| 490 | return false; |
| 491 | |
| 492 | /* d) ES or SCB => !SC */ |
| 493 | if ((h->tci_an & MACSEC_TCI_ES || h->tci_an & MACSEC_TCI_SCB) && |
| 494 | (h->tci_an & MACSEC_TCI_SC)) |
| 495 | return false; |
| 496 | |
| 497 | /* e) Bits 7 and 8 of octet 4 of the SecTAG are clear */ |
| 498 | if (h->unused) |
| 499 | return false; |
| 500 | |
| 501 | /* rx.pn != 0 (figure 10-5) */ |
| 502 | if (!h->packet_number) |
| 503 | return false; |
| 504 | |
| 505 | /* length check, f) g) h) i) */ |
| 506 | if (h->short_length) |
| 507 | return len == extra_len + h->short_length; |
| 508 | return len >= extra_len + MIN_NON_SHORT_LEN; |
| 509 | } |
| 510 | |
| 511 | #define MACSEC_NEEDED_HEADROOM (macsec_extra_len(true)) |
Davide Caratti | 2ccbe2c | 2016-07-22 15:07:56 +0200 | [diff] [blame] | 512 | #define MACSEC_NEEDED_TAILROOM MACSEC_STD_ICV_LEN |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 513 | |
| 514 | static void macsec_fill_iv(unsigned char *iv, sci_t sci, u32 pn) |
| 515 | { |
| 516 | struct gcm_iv *gcm_iv = (struct gcm_iv *)iv; |
| 517 | |
| 518 | gcm_iv->sci = sci; |
| 519 | gcm_iv->pn = htonl(pn); |
| 520 | } |
| 521 | |
| 522 | static struct macsec_eth_header *macsec_ethhdr(struct sk_buff *skb) |
| 523 | { |
| 524 | return (struct macsec_eth_header *)skb_mac_header(skb); |
| 525 | } |
| 526 | |
| 527 | static u32 tx_sa_update_pn(struct macsec_tx_sa *tx_sa, struct macsec_secy *secy) |
| 528 | { |
| 529 | u32 pn; |
| 530 | |
| 531 | spin_lock_bh(&tx_sa->lock); |
| 532 | pn = tx_sa->next_pn; |
| 533 | |
| 534 | tx_sa->next_pn++; |
| 535 | if (tx_sa->next_pn == 0) { |
| 536 | pr_debug("PN wrapped, transitioning to !oper\n"); |
| 537 | tx_sa->active = false; |
| 538 | if (secy->protect_frames) |
| 539 | secy->operational = false; |
| 540 | } |
| 541 | spin_unlock_bh(&tx_sa->lock); |
| 542 | |
| 543 | return pn; |
| 544 | } |
| 545 | |
| 546 | static void macsec_encrypt_finish(struct sk_buff *skb, struct net_device *dev) |
| 547 | { |
| 548 | struct macsec_dev *macsec = netdev_priv(dev); |
| 549 | |
| 550 | skb->dev = macsec->real_dev; |
| 551 | skb_reset_mac_header(skb); |
| 552 | skb->protocol = eth_hdr(skb)->h_proto; |
| 553 | } |
| 554 | |
| 555 | static void macsec_count_tx(struct sk_buff *skb, struct macsec_tx_sc *tx_sc, |
| 556 | struct macsec_tx_sa *tx_sa) |
| 557 | { |
| 558 | struct pcpu_tx_sc_stats *txsc_stats = this_cpu_ptr(tx_sc->stats); |
| 559 | |
| 560 | u64_stats_update_begin(&txsc_stats->syncp); |
| 561 | if (tx_sc->encrypt) { |
| 562 | txsc_stats->stats.OutOctetsEncrypted += skb->len; |
| 563 | txsc_stats->stats.OutPktsEncrypted++; |
| 564 | this_cpu_inc(tx_sa->stats->OutPktsEncrypted); |
| 565 | } else { |
| 566 | txsc_stats->stats.OutOctetsProtected += skb->len; |
| 567 | txsc_stats->stats.OutPktsProtected++; |
| 568 | this_cpu_inc(tx_sa->stats->OutPktsProtected); |
| 569 | } |
| 570 | u64_stats_update_end(&txsc_stats->syncp); |
| 571 | } |
| 572 | |
| 573 | static void count_tx(struct net_device *dev, int ret, int len) |
| 574 | { |
| 575 | if (likely(ret == NET_XMIT_SUCCESS || ret == NET_XMIT_CN)) { |
| 576 | struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); |
| 577 | |
| 578 | u64_stats_update_begin(&stats->syncp); |
| 579 | stats->tx_packets++; |
| 580 | stats->tx_bytes += len; |
| 581 | u64_stats_update_end(&stats->syncp); |
| 582 | } else { |
| 583 | dev->stats.tx_dropped++; |
| 584 | } |
| 585 | } |
| 586 | |
| 587 | static void macsec_encrypt_done(struct crypto_async_request *base, int err) |
| 588 | { |
| 589 | struct sk_buff *skb = base->data; |
| 590 | struct net_device *dev = skb->dev; |
| 591 | struct macsec_dev *macsec = macsec_priv(dev); |
| 592 | struct macsec_tx_sa *sa = macsec_skb_cb(skb)->tx_sa; |
| 593 | int len, ret; |
| 594 | |
| 595 | aead_request_free(macsec_skb_cb(skb)->req); |
| 596 | |
| 597 | rcu_read_lock_bh(); |
| 598 | macsec_encrypt_finish(skb, dev); |
| 599 | macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); |
| 600 | len = skb->len; |
| 601 | ret = dev_queue_xmit(skb); |
| 602 | count_tx(dev, ret, len); |
| 603 | rcu_read_unlock_bh(); |
| 604 | |
| 605 | macsec_txsa_put(sa); |
| 606 | dev_put(dev); |
| 607 | } |
| 608 | |
Sabrina Dubroca | 5d9649b | 2016-06-14 15:25:15 +0200 | [diff] [blame] | 609 | static struct aead_request *macsec_alloc_req(struct crypto_aead *tfm, |
| 610 | unsigned char **iv, |
| 611 | struct scatterlist **sg) |
| 612 | { |
| 613 | size_t size, iv_offset, sg_offset; |
| 614 | struct aead_request *req; |
| 615 | void *tmp; |
| 616 | |
| 617 | size = sizeof(struct aead_request) + crypto_aead_reqsize(tfm); |
| 618 | iv_offset = size; |
| 619 | size += GCM_AES_IV_LEN; |
| 620 | |
| 621 | size = ALIGN(size, __alignof__(struct scatterlist)); |
| 622 | sg_offset = size; |
| 623 | size += sizeof(struct scatterlist) * (MAX_SKB_FRAGS + 1); |
| 624 | |
| 625 | tmp = kmalloc(size, GFP_ATOMIC); |
| 626 | if (!tmp) |
| 627 | return NULL; |
| 628 | |
| 629 | *iv = (unsigned char *)(tmp + iv_offset); |
| 630 | *sg = (struct scatterlist *)(tmp + sg_offset); |
| 631 | req = tmp; |
| 632 | |
| 633 | aead_request_set_tfm(req, tfm); |
| 634 | |
| 635 | return req; |
| 636 | } |
| 637 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 638 | static struct sk_buff *macsec_encrypt(struct sk_buff *skb, |
| 639 | struct net_device *dev) |
| 640 | { |
| 641 | int ret; |
Sabrina Dubroca | 5d9649b | 2016-06-14 15:25:15 +0200 | [diff] [blame] | 642 | struct scatterlist *sg; |
| 643 | unsigned char *iv; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 644 | struct ethhdr *eth; |
| 645 | struct macsec_eth_header *hh; |
| 646 | size_t unprotected_len; |
| 647 | struct aead_request *req; |
| 648 | struct macsec_secy *secy; |
| 649 | struct macsec_tx_sc *tx_sc; |
| 650 | struct macsec_tx_sa *tx_sa; |
| 651 | struct macsec_dev *macsec = macsec_priv(dev); |
| 652 | u32 pn; |
| 653 | |
| 654 | secy = &macsec->secy; |
| 655 | tx_sc = &secy->tx_sc; |
| 656 | |
| 657 | /* 10.5.1 TX SA assignment */ |
| 658 | tx_sa = macsec_txsa_get(tx_sc->sa[tx_sc->encoding_sa]); |
| 659 | if (!tx_sa) { |
| 660 | secy->operational = false; |
| 661 | kfree_skb(skb); |
| 662 | return ERR_PTR(-EINVAL); |
| 663 | } |
| 664 | |
| 665 | if (unlikely(skb_headroom(skb) < MACSEC_NEEDED_HEADROOM || |
| 666 | skb_tailroom(skb) < MACSEC_NEEDED_TAILROOM)) { |
| 667 | struct sk_buff *nskb = skb_copy_expand(skb, |
| 668 | MACSEC_NEEDED_HEADROOM, |
| 669 | MACSEC_NEEDED_TAILROOM, |
| 670 | GFP_ATOMIC); |
| 671 | if (likely(nskb)) { |
| 672 | consume_skb(skb); |
| 673 | skb = nskb; |
| 674 | } else { |
| 675 | macsec_txsa_put(tx_sa); |
| 676 | kfree_skb(skb); |
| 677 | return ERR_PTR(-ENOMEM); |
| 678 | } |
| 679 | } else { |
| 680 | skb = skb_unshare(skb, GFP_ATOMIC); |
| 681 | if (!skb) { |
| 682 | macsec_txsa_put(tx_sa); |
| 683 | return ERR_PTR(-ENOMEM); |
| 684 | } |
| 685 | } |
| 686 | |
| 687 | unprotected_len = skb->len; |
| 688 | eth = eth_hdr(skb); |
| 689 | hh = (struct macsec_eth_header *)skb_push(skb, macsec_extra_len(tx_sc->send_sci)); |
| 690 | memmove(hh, eth, 2 * ETH_ALEN); |
| 691 | |
| 692 | pn = tx_sa_update_pn(tx_sa, secy); |
| 693 | if (pn == 0) { |
| 694 | macsec_txsa_put(tx_sa); |
| 695 | kfree_skb(skb); |
| 696 | return ERR_PTR(-ENOLINK); |
| 697 | } |
| 698 | macsec_fill_sectag(hh, secy, pn); |
| 699 | macsec_set_shortlen(hh, unprotected_len - 2 * ETH_ALEN); |
| 700 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 701 | skb_put(skb, secy->icv_len); |
| 702 | |
| 703 | if (skb->len - ETH_HLEN > macsec_priv(dev)->real_dev->mtu) { |
| 704 | struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); |
| 705 | |
| 706 | u64_stats_update_begin(&secy_stats->syncp); |
| 707 | secy_stats->stats.OutPktsTooLong++; |
| 708 | u64_stats_update_end(&secy_stats->syncp); |
| 709 | |
| 710 | macsec_txsa_put(tx_sa); |
| 711 | kfree_skb(skb); |
| 712 | return ERR_PTR(-EINVAL); |
| 713 | } |
| 714 | |
Sabrina Dubroca | 5d9649b | 2016-06-14 15:25:15 +0200 | [diff] [blame] | 715 | req = macsec_alloc_req(tx_sa->key.tfm, &iv, &sg); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 716 | if (!req) { |
| 717 | macsec_txsa_put(tx_sa); |
| 718 | kfree_skb(skb); |
| 719 | return ERR_PTR(-ENOMEM); |
| 720 | } |
| 721 | |
Sabrina Dubroca | 5d9649b | 2016-06-14 15:25:15 +0200 | [diff] [blame] | 722 | macsec_fill_iv(iv, secy->sci, pn); |
| 723 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 724 | sg_init_table(sg, MAX_SKB_FRAGS + 1); |
| 725 | skb_to_sgvec(skb, sg, 0, skb->len); |
| 726 | |
| 727 | if (tx_sc->encrypt) { |
| 728 | int len = skb->len - macsec_hdr_len(tx_sc->send_sci) - |
| 729 | secy->icv_len; |
| 730 | aead_request_set_crypt(req, sg, sg, len, iv); |
| 731 | aead_request_set_ad(req, macsec_hdr_len(tx_sc->send_sci)); |
| 732 | } else { |
| 733 | aead_request_set_crypt(req, sg, sg, 0, iv); |
| 734 | aead_request_set_ad(req, skb->len - secy->icv_len); |
| 735 | } |
| 736 | |
| 737 | macsec_skb_cb(skb)->req = req; |
| 738 | macsec_skb_cb(skb)->tx_sa = tx_sa; |
| 739 | aead_request_set_callback(req, 0, macsec_encrypt_done, skb); |
| 740 | |
| 741 | dev_hold(skb->dev); |
| 742 | ret = crypto_aead_encrypt(req); |
| 743 | if (ret == -EINPROGRESS) { |
| 744 | return ERR_PTR(ret); |
| 745 | } else if (ret != 0) { |
| 746 | dev_put(skb->dev); |
| 747 | kfree_skb(skb); |
| 748 | aead_request_free(req); |
| 749 | macsec_txsa_put(tx_sa); |
| 750 | return ERR_PTR(-EINVAL); |
| 751 | } |
| 752 | |
| 753 | dev_put(skb->dev); |
| 754 | aead_request_free(req); |
| 755 | macsec_txsa_put(tx_sa); |
| 756 | |
| 757 | return skb; |
| 758 | } |
| 759 | |
| 760 | static bool macsec_post_decrypt(struct sk_buff *skb, struct macsec_secy *secy, u32 pn) |
| 761 | { |
| 762 | struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; |
| 763 | struct pcpu_rx_sc_stats *rxsc_stats = this_cpu_ptr(rx_sa->sc->stats); |
| 764 | struct macsec_eth_header *hdr = macsec_ethhdr(skb); |
| 765 | u32 lowest_pn = 0; |
| 766 | |
| 767 | spin_lock(&rx_sa->lock); |
| 768 | if (rx_sa->next_pn >= secy->replay_window) |
| 769 | lowest_pn = rx_sa->next_pn - secy->replay_window; |
| 770 | |
| 771 | /* Now perform replay protection check again |
| 772 | * (see IEEE 802.1AE-2006 figure 10-5) |
| 773 | */ |
| 774 | if (secy->replay_protect && pn < lowest_pn) { |
| 775 | spin_unlock(&rx_sa->lock); |
| 776 | u64_stats_update_begin(&rxsc_stats->syncp); |
| 777 | rxsc_stats->stats.InPktsLate++; |
| 778 | u64_stats_update_end(&rxsc_stats->syncp); |
| 779 | return false; |
| 780 | } |
| 781 | |
| 782 | if (secy->validate_frames != MACSEC_VALIDATE_DISABLED) { |
| 783 | u64_stats_update_begin(&rxsc_stats->syncp); |
| 784 | if (hdr->tci_an & MACSEC_TCI_E) |
| 785 | rxsc_stats->stats.InOctetsDecrypted += skb->len; |
| 786 | else |
| 787 | rxsc_stats->stats.InOctetsValidated += skb->len; |
| 788 | u64_stats_update_end(&rxsc_stats->syncp); |
| 789 | } |
| 790 | |
| 791 | if (!macsec_skb_cb(skb)->valid) { |
| 792 | spin_unlock(&rx_sa->lock); |
| 793 | |
| 794 | /* 10.6.5 */ |
| 795 | if (hdr->tci_an & MACSEC_TCI_C || |
| 796 | secy->validate_frames == MACSEC_VALIDATE_STRICT) { |
| 797 | u64_stats_update_begin(&rxsc_stats->syncp); |
| 798 | rxsc_stats->stats.InPktsNotValid++; |
| 799 | u64_stats_update_end(&rxsc_stats->syncp); |
| 800 | return false; |
| 801 | } |
| 802 | |
| 803 | u64_stats_update_begin(&rxsc_stats->syncp); |
| 804 | if (secy->validate_frames == MACSEC_VALIDATE_CHECK) { |
| 805 | rxsc_stats->stats.InPktsInvalid++; |
| 806 | this_cpu_inc(rx_sa->stats->InPktsInvalid); |
| 807 | } else if (pn < lowest_pn) { |
| 808 | rxsc_stats->stats.InPktsDelayed++; |
| 809 | } else { |
| 810 | rxsc_stats->stats.InPktsUnchecked++; |
| 811 | } |
| 812 | u64_stats_update_end(&rxsc_stats->syncp); |
| 813 | } else { |
| 814 | u64_stats_update_begin(&rxsc_stats->syncp); |
| 815 | if (pn < lowest_pn) { |
| 816 | rxsc_stats->stats.InPktsDelayed++; |
| 817 | } else { |
| 818 | rxsc_stats->stats.InPktsOK++; |
| 819 | this_cpu_inc(rx_sa->stats->InPktsOK); |
| 820 | } |
| 821 | u64_stats_update_end(&rxsc_stats->syncp); |
| 822 | |
| 823 | if (pn >= rx_sa->next_pn) |
| 824 | rx_sa->next_pn = pn + 1; |
| 825 | spin_unlock(&rx_sa->lock); |
| 826 | } |
| 827 | |
| 828 | return true; |
| 829 | } |
| 830 | |
| 831 | static void macsec_reset_skb(struct sk_buff *skb, struct net_device *dev) |
| 832 | { |
| 833 | skb->pkt_type = PACKET_HOST; |
| 834 | skb->protocol = eth_type_trans(skb, dev); |
| 835 | |
| 836 | skb_reset_network_header(skb); |
| 837 | if (!skb_transport_header_was_set(skb)) |
| 838 | skb_reset_transport_header(skb); |
| 839 | skb_reset_mac_len(skb); |
| 840 | } |
| 841 | |
| 842 | static void macsec_finalize_skb(struct sk_buff *skb, u8 icv_len, u8 hdr_len) |
| 843 | { |
| 844 | memmove(skb->data + hdr_len, skb->data, 2 * ETH_ALEN); |
| 845 | skb_pull(skb, hdr_len); |
| 846 | pskb_trim_unique(skb, skb->len - icv_len); |
| 847 | } |
| 848 | |
| 849 | static void count_rx(struct net_device *dev, int len) |
| 850 | { |
| 851 | struct pcpu_sw_netstats *stats = this_cpu_ptr(dev->tstats); |
| 852 | |
| 853 | u64_stats_update_begin(&stats->syncp); |
| 854 | stats->rx_packets++; |
| 855 | stats->rx_bytes += len; |
| 856 | u64_stats_update_end(&stats->syncp); |
| 857 | } |
| 858 | |
| 859 | static void macsec_decrypt_done(struct crypto_async_request *base, int err) |
| 860 | { |
| 861 | struct sk_buff *skb = base->data; |
| 862 | struct net_device *dev = skb->dev; |
| 863 | struct macsec_dev *macsec = macsec_priv(dev); |
| 864 | struct macsec_rx_sa *rx_sa = macsec_skb_cb(skb)->rx_sa; |
Sabrina Dubroca | c78ebe1 | 2016-07-29 15:37:53 +0200 | [diff] [blame] | 865 | struct macsec_rx_sc *rx_sc = rx_sa->sc; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 866 | int len, ret; |
| 867 | u32 pn; |
| 868 | |
| 869 | aead_request_free(macsec_skb_cb(skb)->req); |
| 870 | |
| 871 | rcu_read_lock_bh(); |
| 872 | pn = ntohl(macsec_ethhdr(skb)->packet_number); |
| 873 | if (!macsec_post_decrypt(skb, &macsec->secy, pn)) { |
| 874 | rcu_read_unlock_bh(); |
| 875 | kfree_skb(skb); |
| 876 | goto out; |
| 877 | } |
| 878 | |
| 879 | macsec_finalize_skb(skb, macsec->secy.icv_len, |
| 880 | macsec_extra_len(macsec_skb_cb(skb)->has_sci)); |
| 881 | macsec_reset_skb(skb, macsec->secy.netdev); |
| 882 | |
| 883 | len = skb->len; |
Paolo Abeni | 5491e7c | 2016-07-20 18:11:32 +0200 | [diff] [blame] | 884 | ret = gro_cells_receive(&macsec->gro_cells, skb); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 885 | if (ret == NET_RX_SUCCESS) |
| 886 | count_rx(dev, len); |
| 887 | else |
| 888 | macsec->secy.netdev->stats.rx_dropped++; |
| 889 | |
| 890 | rcu_read_unlock_bh(); |
| 891 | |
| 892 | out: |
| 893 | macsec_rxsa_put(rx_sa); |
Sabrina Dubroca | c78ebe1 | 2016-07-29 15:37:53 +0200 | [diff] [blame] | 894 | macsec_rxsc_put(rx_sc); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 895 | dev_put(dev); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 896 | } |
| 897 | |
| 898 | static struct sk_buff *macsec_decrypt(struct sk_buff *skb, |
| 899 | struct net_device *dev, |
| 900 | struct macsec_rx_sa *rx_sa, |
| 901 | sci_t sci, |
| 902 | struct macsec_secy *secy) |
| 903 | { |
| 904 | int ret; |
Sabrina Dubroca | 5d9649b | 2016-06-14 15:25:15 +0200 | [diff] [blame] | 905 | struct scatterlist *sg; |
| 906 | unsigned char *iv; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 907 | struct aead_request *req; |
| 908 | struct macsec_eth_header *hdr; |
| 909 | u16 icv_len = secy->icv_len; |
| 910 | |
| 911 | macsec_skb_cb(skb)->valid = false; |
| 912 | skb = skb_share_check(skb, GFP_ATOMIC); |
| 913 | if (!skb) |
Sabrina Dubroca | c3b7d0b | 2016-04-22 11:28:04 +0200 | [diff] [blame] | 914 | return ERR_PTR(-ENOMEM); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 915 | |
Sabrina Dubroca | 5d9649b | 2016-06-14 15:25:15 +0200 | [diff] [blame] | 916 | req = macsec_alloc_req(rx_sa->key.tfm, &iv, &sg); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 917 | if (!req) { |
| 918 | kfree_skb(skb); |
Sabrina Dubroca | c3b7d0b | 2016-04-22 11:28:04 +0200 | [diff] [blame] | 919 | return ERR_PTR(-ENOMEM); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 920 | } |
| 921 | |
| 922 | hdr = (struct macsec_eth_header *)skb->data; |
| 923 | macsec_fill_iv(iv, sci, ntohl(hdr->packet_number)); |
| 924 | |
| 925 | sg_init_table(sg, MAX_SKB_FRAGS + 1); |
| 926 | skb_to_sgvec(skb, sg, 0, skb->len); |
| 927 | |
| 928 | if (hdr->tci_an & MACSEC_TCI_E) { |
| 929 | /* confidentiality: ethernet + macsec header |
| 930 | * authenticated, encrypted payload |
| 931 | */ |
| 932 | int len = skb->len - macsec_hdr_len(macsec_skb_cb(skb)->has_sci); |
| 933 | |
| 934 | aead_request_set_crypt(req, sg, sg, len, iv); |
| 935 | aead_request_set_ad(req, macsec_hdr_len(macsec_skb_cb(skb)->has_sci)); |
| 936 | skb = skb_unshare(skb, GFP_ATOMIC); |
| 937 | if (!skb) { |
| 938 | aead_request_free(req); |
Sabrina Dubroca | c3b7d0b | 2016-04-22 11:28:04 +0200 | [diff] [blame] | 939 | return ERR_PTR(-ENOMEM); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 940 | } |
| 941 | } else { |
| 942 | /* integrity only: all headers + data authenticated */ |
| 943 | aead_request_set_crypt(req, sg, sg, icv_len, iv); |
| 944 | aead_request_set_ad(req, skb->len - icv_len); |
| 945 | } |
| 946 | |
| 947 | macsec_skb_cb(skb)->req = req; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 948 | skb->dev = dev; |
| 949 | aead_request_set_callback(req, 0, macsec_decrypt_done, skb); |
| 950 | |
| 951 | dev_hold(dev); |
| 952 | ret = crypto_aead_decrypt(req); |
| 953 | if (ret == -EINPROGRESS) { |
Sabrina Dubroca | c3b7d0b | 2016-04-22 11:28:04 +0200 | [diff] [blame] | 954 | return ERR_PTR(ret); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 955 | } else if (ret != 0) { |
| 956 | /* decryption/authentication failed |
| 957 | * 10.6 if validateFrames is disabled, deliver anyway |
| 958 | */ |
| 959 | if (ret != -EBADMSG) { |
| 960 | kfree_skb(skb); |
Sabrina Dubroca | c3b7d0b | 2016-04-22 11:28:04 +0200 | [diff] [blame] | 961 | skb = ERR_PTR(ret); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 962 | } |
| 963 | } else { |
| 964 | macsec_skb_cb(skb)->valid = true; |
| 965 | } |
| 966 | dev_put(dev); |
| 967 | |
| 968 | aead_request_free(req); |
| 969 | |
| 970 | return skb; |
| 971 | } |
| 972 | |
| 973 | static struct macsec_rx_sc *find_rx_sc(struct macsec_secy *secy, sci_t sci) |
| 974 | { |
| 975 | struct macsec_rx_sc *rx_sc; |
| 976 | |
| 977 | for_each_rxsc(secy, rx_sc) { |
| 978 | if (rx_sc->sci == sci) |
| 979 | return rx_sc; |
| 980 | } |
| 981 | |
| 982 | return NULL; |
| 983 | } |
| 984 | |
| 985 | static struct macsec_rx_sc *find_rx_sc_rtnl(struct macsec_secy *secy, sci_t sci) |
| 986 | { |
| 987 | struct macsec_rx_sc *rx_sc; |
| 988 | |
| 989 | for_each_rxsc_rtnl(secy, rx_sc) { |
| 990 | if (rx_sc->sci == sci) |
| 991 | return rx_sc; |
| 992 | } |
| 993 | |
| 994 | return NULL; |
| 995 | } |
| 996 | |
| 997 | static void handle_not_macsec(struct sk_buff *skb) |
| 998 | { |
| 999 | struct macsec_rxh_data *rxd; |
| 1000 | struct macsec_dev *macsec; |
| 1001 | |
| 1002 | rcu_read_lock(); |
| 1003 | rxd = macsec_data_rcu(skb->dev); |
| 1004 | |
| 1005 | /* 10.6 If the management control validateFrames is not |
| 1006 | * Strict, frames without a SecTAG are received, counted, and |
| 1007 | * delivered to the Controlled Port |
| 1008 | */ |
| 1009 | list_for_each_entry_rcu(macsec, &rxd->secys, secys) { |
| 1010 | struct sk_buff *nskb; |
| 1011 | int ret; |
| 1012 | struct pcpu_secy_stats *secy_stats = this_cpu_ptr(macsec->stats); |
| 1013 | |
| 1014 | if (macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { |
| 1015 | u64_stats_update_begin(&secy_stats->syncp); |
| 1016 | secy_stats->stats.InPktsNoTag++; |
| 1017 | u64_stats_update_end(&secy_stats->syncp); |
| 1018 | continue; |
| 1019 | } |
| 1020 | |
| 1021 | /* deliver on this port */ |
| 1022 | nskb = skb_clone(skb, GFP_ATOMIC); |
| 1023 | if (!nskb) |
| 1024 | break; |
| 1025 | |
| 1026 | nskb->dev = macsec->secy.netdev; |
| 1027 | |
| 1028 | ret = netif_rx(nskb); |
| 1029 | if (ret == NET_RX_SUCCESS) { |
| 1030 | u64_stats_update_begin(&secy_stats->syncp); |
| 1031 | secy_stats->stats.InPktsUntagged++; |
| 1032 | u64_stats_update_end(&secy_stats->syncp); |
| 1033 | } else { |
| 1034 | macsec->secy.netdev->stats.rx_dropped++; |
| 1035 | } |
| 1036 | } |
| 1037 | |
| 1038 | rcu_read_unlock(); |
| 1039 | } |
| 1040 | |
| 1041 | static rx_handler_result_t macsec_handle_frame(struct sk_buff **pskb) |
| 1042 | { |
| 1043 | struct sk_buff *skb = *pskb; |
| 1044 | struct net_device *dev = skb->dev; |
| 1045 | struct macsec_eth_header *hdr; |
| 1046 | struct macsec_secy *secy = NULL; |
| 1047 | struct macsec_rx_sc *rx_sc; |
| 1048 | struct macsec_rx_sa *rx_sa; |
| 1049 | struct macsec_rxh_data *rxd; |
| 1050 | struct macsec_dev *macsec; |
| 1051 | sci_t sci; |
| 1052 | u32 pn; |
| 1053 | bool cbit; |
| 1054 | struct pcpu_rx_sc_stats *rxsc_stats; |
| 1055 | struct pcpu_secy_stats *secy_stats; |
| 1056 | bool pulled_sci; |
Paolo Abeni | 5491e7c | 2016-07-20 18:11:32 +0200 | [diff] [blame] | 1057 | int ret; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1058 | |
| 1059 | if (skb_headroom(skb) < ETH_HLEN) |
| 1060 | goto drop_direct; |
| 1061 | |
| 1062 | hdr = macsec_ethhdr(skb); |
| 1063 | if (hdr->eth.h_proto != htons(ETH_P_MACSEC)) { |
| 1064 | handle_not_macsec(skb); |
| 1065 | |
| 1066 | /* and deliver to the uncontrolled port */ |
| 1067 | return RX_HANDLER_PASS; |
| 1068 | } |
| 1069 | |
| 1070 | skb = skb_unshare(skb, GFP_ATOMIC); |
| 1071 | if (!skb) { |
| 1072 | *pskb = NULL; |
| 1073 | return RX_HANDLER_CONSUMED; |
| 1074 | } |
| 1075 | |
| 1076 | pulled_sci = pskb_may_pull(skb, macsec_extra_len(true)); |
| 1077 | if (!pulled_sci) { |
| 1078 | if (!pskb_may_pull(skb, macsec_extra_len(false))) |
| 1079 | goto drop_direct; |
| 1080 | } |
| 1081 | |
| 1082 | hdr = macsec_ethhdr(skb); |
| 1083 | |
| 1084 | /* Frames with a SecTAG that has the TCI E bit set but the C |
| 1085 | * bit clear are discarded, as this reserved encoding is used |
| 1086 | * to identify frames with a SecTAG that are not to be |
| 1087 | * delivered to the Controlled Port. |
| 1088 | */ |
| 1089 | if ((hdr->tci_an & (MACSEC_TCI_C | MACSEC_TCI_E)) == MACSEC_TCI_E) |
| 1090 | return RX_HANDLER_PASS; |
| 1091 | |
| 1092 | /* now, pull the extra length */ |
| 1093 | if (hdr->tci_an & MACSEC_TCI_SC) { |
| 1094 | if (!pulled_sci) |
| 1095 | goto drop_direct; |
| 1096 | } |
| 1097 | |
| 1098 | /* ethernet header is part of crypto processing */ |
| 1099 | skb_push(skb, ETH_HLEN); |
| 1100 | |
| 1101 | macsec_skb_cb(skb)->has_sci = !!(hdr->tci_an & MACSEC_TCI_SC); |
| 1102 | macsec_skb_cb(skb)->assoc_num = hdr->tci_an & MACSEC_AN_MASK; |
| 1103 | sci = macsec_frame_sci(hdr, macsec_skb_cb(skb)->has_sci); |
| 1104 | |
| 1105 | rcu_read_lock(); |
| 1106 | rxd = macsec_data_rcu(skb->dev); |
| 1107 | |
| 1108 | list_for_each_entry_rcu(macsec, &rxd->secys, secys) { |
| 1109 | struct macsec_rx_sc *sc = find_rx_sc(&macsec->secy, sci); |
Sabrina Dubroca | c78ebe1 | 2016-07-29 15:37:53 +0200 | [diff] [blame] | 1110 | sc = sc ? macsec_rxsc_get(sc) : NULL; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1111 | |
| 1112 | if (sc) { |
| 1113 | secy = &macsec->secy; |
| 1114 | rx_sc = sc; |
| 1115 | break; |
| 1116 | } |
| 1117 | } |
| 1118 | |
| 1119 | if (!secy) |
| 1120 | goto nosci; |
| 1121 | |
| 1122 | dev = secy->netdev; |
| 1123 | macsec = macsec_priv(dev); |
| 1124 | secy_stats = this_cpu_ptr(macsec->stats); |
| 1125 | rxsc_stats = this_cpu_ptr(rx_sc->stats); |
| 1126 | |
| 1127 | if (!macsec_validate_skb(skb, secy->icv_len)) { |
| 1128 | u64_stats_update_begin(&secy_stats->syncp); |
| 1129 | secy_stats->stats.InPktsBadTag++; |
| 1130 | u64_stats_update_end(&secy_stats->syncp); |
| 1131 | goto drop_nosa; |
| 1132 | } |
| 1133 | |
| 1134 | rx_sa = macsec_rxsa_get(rx_sc->sa[macsec_skb_cb(skb)->assoc_num]); |
| 1135 | if (!rx_sa) { |
| 1136 | /* 10.6.1 if the SA is not in use */ |
| 1137 | |
| 1138 | /* If validateFrames is Strict or the C bit in the |
| 1139 | * SecTAG is set, discard |
| 1140 | */ |
| 1141 | if (hdr->tci_an & MACSEC_TCI_C || |
| 1142 | secy->validate_frames == MACSEC_VALIDATE_STRICT) { |
| 1143 | u64_stats_update_begin(&rxsc_stats->syncp); |
| 1144 | rxsc_stats->stats.InPktsNotUsingSA++; |
| 1145 | u64_stats_update_end(&rxsc_stats->syncp); |
| 1146 | goto drop_nosa; |
| 1147 | } |
| 1148 | |
| 1149 | /* not Strict, the frame (with the SecTAG and ICV |
| 1150 | * removed) is delivered to the Controlled Port. |
| 1151 | */ |
| 1152 | u64_stats_update_begin(&rxsc_stats->syncp); |
| 1153 | rxsc_stats->stats.InPktsUnusedSA++; |
| 1154 | u64_stats_update_end(&rxsc_stats->syncp); |
| 1155 | goto deliver; |
| 1156 | } |
| 1157 | |
| 1158 | /* First, PN check to avoid decrypting obviously wrong packets */ |
| 1159 | pn = ntohl(hdr->packet_number); |
| 1160 | if (secy->replay_protect) { |
| 1161 | bool late; |
| 1162 | |
| 1163 | spin_lock(&rx_sa->lock); |
| 1164 | late = rx_sa->next_pn >= secy->replay_window && |
| 1165 | pn < (rx_sa->next_pn - secy->replay_window); |
| 1166 | spin_unlock(&rx_sa->lock); |
| 1167 | |
| 1168 | if (late) { |
| 1169 | u64_stats_update_begin(&rxsc_stats->syncp); |
| 1170 | rxsc_stats->stats.InPktsLate++; |
| 1171 | u64_stats_update_end(&rxsc_stats->syncp); |
| 1172 | goto drop; |
| 1173 | } |
| 1174 | } |
| 1175 | |
Beniamino Galvani | e3a3b62 | 2016-07-26 12:24:53 +0200 | [diff] [blame] | 1176 | macsec_skb_cb(skb)->rx_sa = rx_sa; |
| 1177 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1178 | /* Disabled && !changed text => skip validation */ |
| 1179 | if (hdr->tci_an & MACSEC_TCI_C || |
| 1180 | secy->validate_frames != MACSEC_VALIDATE_DISABLED) |
| 1181 | skb = macsec_decrypt(skb, dev, rx_sa, sci, secy); |
| 1182 | |
Sabrina Dubroca | c3b7d0b | 2016-04-22 11:28:04 +0200 | [diff] [blame] | 1183 | if (IS_ERR(skb)) { |
| 1184 | /* the decrypt callback needs the reference */ |
Sabrina Dubroca | c78ebe1 | 2016-07-29 15:37:53 +0200 | [diff] [blame] | 1185 | if (PTR_ERR(skb) != -EINPROGRESS) { |
Sabrina Dubroca | c3b7d0b | 2016-04-22 11:28:04 +0200 | [diff] [blame] | 1186 | macsec_rxsa_put(rx_sa); |
Sabrina Dubroca | c78ebe1 | 2016-07-29 15:37:53 +0200 | [diff] [blame] | 1187 | macsec_rxsc_put(rx_sc); |
| 1188 | } |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1189 | rcu_read_unlock(); |
| 1190 | *pskb = NULL; |
| 1191 | return RX_HANDLER_CONSUMED; |
| 1192 | } |
| 1193 | |
| 1194 | if (!macsec_post_decrypt(skb, secy, pn)) |
| 1195 | goto drop; |
| 1196 | |
| 1197 | deliver: |
| 1198 | macsec_finalize_skb(skb, secy->icv_len, |
| 1199 | macsec_extra_len(macsec_skb_cb(skb)->has_sci)); |
| 1200 | macsec_reset_skb(skb, secy->netdev); |
| 1201 | |
Sabrina Dubroca | 497f358 | 2016-04-22 11:28:03 +0200 | [diff] [blame] | 1202 | if (rx_sa) |
| 1203 | macsec_rxsa_put(rx_sa); |
Sabrina Dubroca | c78ebe1 | 2016-07-29 15:37:53 +0200 | [diff] [blame] | 1204 | macsec_rxsc_put(rx_sc); |
Paolo Abeni | 5491e7c | 2016-07-20 18:11:32 +0200 | [diff] [blame] | 1205 | |
| 1206 | ret = gro_cells_receive(&macsec->gro_cells, skb); |
| 1207 | if (ret == NET_RX_SUCCESS) |
| 1208 | count_rx(dev, skb->len); |
| 1209 | else |
| 1210 | macsec->secy.netdev->stats.rx_dropped++; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1211 | |
| 1212 | rcu_read_unlock(); |
| 1213 | |
Paolo Abeni | 5491e7c | 2016-07-20 18:11:32 +0200 | [diff] [blame] | 1214 | *pskb = NULL; |
| 1215 | return RX_HANDLER_CONSUMED; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1216 | |
| 1217 | drop: |
| 1218 | macsec_rxsa_put(rx_sa); |
| 1219 | drop_nosa: |
Sabrina Dubroca | c78ebe1 | 2016-07-29 15:37:53 +0200 | [diff] [blame] | 1220 | macsec_rxsc_put(rx_sc); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1221 | rcu_read_unlock(); |
| 1222 | drop_direct: |
| 1223 | kfree_skb(skb); |
| 1224 | *pskb = NULL; |
| 1225 | return RX_HANDLER_CONSUMED; |
| 1226 | |
| 1227 | nosci: |
| 1228 | /* 10.6.1 if the SC is not found */ |
| 1229 | cbit = !!(hdr->tci_an & MACSEC_TCI_C); |
| 1230 | if (!cbit) |
| 1231 | macsec_finalize_skb(skb, DEFAULT_ICV_LEN, |
| 1232 | macsec_extra_len(macsec_skb_cb(skb)->has_sci)); |
| 1233 | |
| 1234 | list_for_each_entry_rcu(macsec, &rxd->secys, secys) { |
| 1235 | struct sk_buff *nskb; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1236 | |
| 1237 | secy_stats = this_cpu_ptr(macsec->stats); |
| 1238 | |
| 1239 | /* If validateFrames is Strict or the C bit in the |
| 1240 | * SecTAG is set, discard |
| 1241 | */ |
| 1242 | if (cbit || |
| 1243 | macsec->secy.validate_frames == MACSEC_VALIDATE_STRICT) { |
| 1244 | u64_stats_update_begin(&secy_stats->syncp); |
| 1245 | secy_stats->stats.InPktsNoSCI++; |
| 1246 | u64_stats_update_end(&secy_stats->syncp); |
| 1247 | continue; |
| 1248 | } |
| 1249 | |
| 1250 | /* not strict, the frame (with the SecTAG and ICV |
| 1251 | * removed) is delivered to the Controlled Port. |
| 1252 | */ |
| 1253 | nskb = skb_clone(skb, GFP_ATOMIC); |
| 1254 | if (!nskb) |
| 1255 | break; |
| 1256 | |
| 1257 | macsec_reset_skb(nskb, macsec->secy.netdev); |
| 1258 | |
| 1259 | ret = netif_rx(nskb); |
| 1260 | if (ret == NET_RX_SUCCESS) { |
| 1261 | u64_stats_update_begin(&secy_stats->syncp); |
| 1262 | secy_stats->stats.InPktsUnknownSCI++; |
| 1263 | u64_stats_update_end(&secy_stats->syncp); |
| 1264 | } else { |
| 1265 | macsec->secy.netdev->stats.rx_dropped++; |
| 1266 | } |
| 1267 | } |
| 1268 | |
| 1269 | rcu_read_unlock(); |
| 1270 | *pskb = skb; |
| 1271 | return RX_HANDLER_PASS; |
| 1272 | } |
| 1273 | |
| 1274 | static struct crypto_aead *macsec_alloc_tfm(char *key, int key_len, int icv_len) |
| 1275 | { |
| 1276 | struct crypto_aead *tfm; |
| 1277 | int ret; |
| 1278 | |
Sabrina Dubroca | 6052f7f | 2016-06-14 15:25:16 +0200 | [diff] [blame] | 1279 | tfm = crypto_alloc_aead("gcm(aes)", 0, 0); |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1280 | |
| 1281 | if (IS_ERR(tfm)) |
| 1282 | return tfm; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1283 | |
| 1284 | ret = crypto_aead_setkey(tfm, key, key_len); |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1285 | if (ret < 0) |
| 1286 | goto fail; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1287 | |
| 1288 | ret = crypto_aead_setauthsize(tfm, icv_len); |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1289 | if (ret < 0) |
| 1290 | goto fail; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1291 | |
| 1292 | return tfm; |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1293 | fail: |
| 1294 | crypto_free_aead(tfm); |
| 1295 | return ERR_PTR(ret); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1296 | } |
| 1297 | |
| 1298 | static int init_rx_sa(struct macsec_rx_sa *rx_sa, char *sak, int key_len, |
| 1299 | int icv_len) |
| 1300 | { |
| 1301 | rx_sa->stats = alloc_percpu(struct macsec_rx_sa_stats); |
| 1302 | if (!rx_sa->stats) |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1303 | return -ENOMEM; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1304 | |
| 1305 | rx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1306 | if (IS_ERR(rx_sa->key.tfm)) { |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1307 | free_percpu(rx_sa->stats); |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1308 | return PTR_ERR(rx_sa->key.tfm); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1309 | } |
| 1310 | |
| 1311 | rx_sa->active = false; |
| 1312 | rx_sa->next_pn = 1; |
| 1313 | atomic_set(&rx_sa->refcnt, 1); |
| 1314 | spin_lock_init(&rx_sa->lock); |
| 1315 | |
| 1316 | return 0; |
| 1317 | } |
| 1318 | |
| 1319 | static void clear_rx_sa(struct macsec_rx_sa *rx_sa) |
| 1320 | { |
| 1321 | rx_sa->active = false; |
| 1322 | |
| 1323 | macsec_rxsa_put(rx_sa); |
| 1324 | } |
| 1325 | |
| 1326 | static void free_rx_sc(struct macsec_rx_sc *rx_sc) |
| 1327 | { |
| 1328 | int i; |
| 1329 | |
| 1330 | for (i = 0; i < MACSEC_NUM_AN; i++) { |
| 1331 | struct macsec_rx_sa *sa = rtnl_dereference(rx_sc->sa[i]); |
| 1332 | |
| 1333 | RCU_INIT_POINTER(rx_sc->sa[i], NULL); |
| 1334 | if (sa) |
| 1335 | clear_rx_sa(sa); |
| 1336 | } |
| 1337 | |
| 1338 | macsec_rxsc_put(rx_sc); |
| 1339 | } |
| 1340 | |
| 1341 | static struct macsec_rx_sc *del_rx_sc(struct macsec_secy *secy, sci_t sci) |
| 1342 | { |
| 1343 | struct macsec_rx_sc *rx_sc, __rcu **rx_scp; |
| 1344 | |
| 1345 | for (rx_scp = &secy->rx_sc, rx_sc = rtnl_dereference(*rx_scp); |
| 1346 | rx_sc; |
| 1347 | rx_scp = &rx_sc->next, rx_sc = rtnl_dereference(*rx_scp)) { |
| 1348 | if (rx_sc->sci == sci) { |
| 1349 | if (rx_sc->active) |
| 1350 | secy->n_rx_sc--; |
| 1351 | rcu_assign_pointer(*rx_scp, rx_sc->next); |
| 1352 | return rx_sc; |
| 1353 | } |
| 1354 | } |
| 1355 | |
| 1356 | return NULL; |
| 1357 | } |
| 1358 | |
| 1359 | static struct macsec_rx_sc *create_rx_sc(struct net_device *dev, sci_t sci) |
| 1360 | { |
| 1361 | struct macsec_rx_sc *rx_sc; |
| 1362 | struct macsec_dev *macsec; |
| 1363 | struct net_device *real_dev = macsec_priv(dev)->real_dev; |
| 1364 | struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); |
| 1365 | struct macsec_secy *secy; |
| 1366 | |
| 1367 | list_for_each_entry(macsec, &rxd->secys, secys) { |
| 1368 | if (find_rx_sc_rtnl(&macsec->secy, sci)) |
| 1369 | return ERR_PTR(-EEXIST); |
| 1370 | } |
| 1371 | |
| 1372 | rx_sc = kzalloc(sizeof(*rx_sc), GFP_KERNEL); |
| 1373 | if (!rx_sc) |
| 1374 | return ERR_PTR(-ENOMEM); |
| 1375 | |
| 1376 | rx_sc->stats = netdev_alloc_pcpu_stats(struct pcpu_rx_sc_stats); |
| 1377 | if (!rx_sc->stats) { |
| 1378 | kfree(rx_sc); |
| 1379 | return ERR_PTR(-ENOMEM); |
| 1380 | } |
| 1381 | |
| 1382 | rx_sc->sci = sci; |
| 1383 | rx_sc->active = true; |
| 1384 | atomic_set(&rx_sc->refcnt, 1); |
| 1385 | |
| 1386 | secy = &macsec_priv(dev)->secy; |
| 1387 | rcu_assign_pointer(rx_sc->next, secy->rx_sc); |
| 1388 | rcu_assign_pointer(secy->rx_sc, rx_sc); |
| 1389 | |
| 1390 | if (rx_sc->active) |
| 1391 | secy->n_rx_sc++; |
| 1392 | |
| 1393 | return rx_sc; |
| 1394 | } |
| 1395 | |
| 1396 | static int init_tx_sa(struct macsec_tx_sa *tx_sa, char *sak, int key_len, |
| 1397 | int icv_len) |
| 1398 | { |
| 1399 | tx_sa->stats = alloc_percpu(struct macsec_tx_sa_stats); |
| 1400 | if (!tx_sa->stats) |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1401 | return -ENOMEM; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1402 | |
| 1403 | tx_sa->key.tfm = macsec_alloc_tfm(sak, key_len, icv_len); |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1404 | if (IS_ERR(tx_sa->key.tfm)) { |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1405 | free_percpu(tx_sa->stats); |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1406 | return PTR_ERR(tx_sa->key.tfm); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1407 | } |
| 1408 | |
| 1409 | tx_sa->active = false; |
| 1410 | atomic_set(&tx_sa->refcnt, 1); |
| 1411 | spin_lock_init(&tx_sa->lock); |
| 1412 | |
| 1413 | return 0; |
| 1414 | } |
| 1415 | |
| 1416 | static void clear_tx_sa(struct macsec_tx_sa *tx_sa) |
| 1417 | { |
| 1418 | tx_sa->active = false; |
| 1419 | |
| 1420 | macsec_txsa_put(tx_sa); |
| 1421 | } |
| 1422 | |
| 1423 | static struct genl_family macsec_fam = { |
| 1424 | .id = GENL_ID_GENERATE, |
| 1425 | .name = MACSEC_GENL_NAME, |
| 1426 | .hdrsize = 0, |
| 1427 | .version = MACSEC_GENL_VERSION, |
| 1428 | .maxattr = MACSEC_ATTR_MAX, |
| 1429 | .netnsok = true, |
| 1430 | }; |
| 1431 | |
| 1432 | static struct net_device *get_dev_from_nl(struct net *net, |
| 1433 | struct nlattr **attrs) |
| 1434 | { |
| 1435 | int ifindex = nla_get_u32(attrs[MACSEC_ATTR_IFINDEX]); |
| 1436 | struct net_device *dev; |
| 1437 | |
| 1438 | dev = __dev_get_by_index(net, ifindex); |
| 1439 | if (!dev) |
| 1440 | return ERR_PTR(-ENODEV); |
| 1441 | |
| 1442 | if (!netif_is_macsec(dev)) |
| 1443 | return ERR_PTR(-ENODEV); |
| 1444 | |
| 1445 | return dev; |
| 1446 | } |
| 1447 | |
| 1448 | static sci_t nla_get_sci(const struct nlattr *nla) |
| 1449 | { |
| 1450 | return (__force sci_t)nla_get_u64(nla); |
| 1451 | } |
| 1452 | |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 1453 | static int nla_put_sci(struct sk_buff *skb, int attrtype, sci_t value, |
| 1454 | int padattr) |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1455 | { |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 1456 | return nla_put_u64_64bit(skb, attrtype, (__force u64)value, padattr); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1457 | } |
| 1458 | |
| 1459 | static struct macsec_tx_sa *get_txsa_from_nl(struct net *net, |
| 1460 | struct nlattr **attrs, |
| 1461 | struct nlattr **tb_sa, |
| 1462 | struct net_device **devp, |
| 1463 | struct macsec_secy **secyp, |
| 1464 | struct macsec_tx_sc **scp, |
| 1465 | u8 *assoc_num) |
| 1466 | { |
| 1467 | struct net_device *dev; |
| 1468 | struct macsec_secy *secy; |
| 1469 | struct macsec_tx_sc *tx_sc; |
| 1470 | struct macsec_tx_sa *tx_sa; |
| 1471 | |
| 1472 | if (!tb_sa[MACSEC_SA_ATTR_AN]) |
| 1473 | return ERR_PTR(-EINVAL); |
| 1474 | |
| 1475 | *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); |
| 1476 | |
| 1477 | dev = get_dev_from_nl(net, attrs); |
| 1478 | if (IS_ERR(dev)) |
| 1479 | return ERR_CAST(dev); |
| 1480 | |
| 1481 | if (*assoc_num >= MACSEC_NUM_AN) |
| 1482 | return ERR_PTR(-EINVAL); |
| 1483 | |
| 1484 | secy = &macsec_priv(dev)->secy; |
| 1485 | tx_sc = &secy->tx_sc; |
| 1486 | |
| 1487 | tx_sa = rtnl_dereference(tx_sc->sa[*assoc_num]); |
| 1488 | if (!tx_sa) |
| 1489 | return ERR_PTR(-ENODEV); |
| 1490 | |
| 1491 | *devp = dev; |
| 1492 | *scp = tx_sc; |
| 1493 | *secyp = secy; |
| 1494 | return tx_sa; |
| 1495 | } |
| 1496 | |
| 1497 | static struct macsec_rx_sc *get_rxsc_from_nl(struct net *net, |
| 1498 | struct nlattr **attrs, |
| 1499 | struct nlattr **tb_rxsc, |
| 1500 | struct net_device **devp, |
| 1501 | struct macsec_secy **secyp) |
| 1502 | { |
| 1503 | struct net_device *dev; |
| 1504 | struct macsec_secy *secy; |
| 1505 | struct macsec_rx_sc *rx_sc; |
| 1506 | sci_t sci; |
| 1507 | |
| 1508 | dev = get_dev_from_nl(net, attrs); |
| 1509 | if (IS_ERR(dev)) |
| 1510 | return ERR_CAST(dev); |
| 1511 | |
| 1512 | secy = &macsec_priv(dev)->secy; |
| 1513 | |
| 1514 | if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) |
| 1515 | return ERR_PTR(-EINVAL); |
| 1516 | |
| 1517 | sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); |
| 1518 | rx_sc = find_rx_sc_rtnl(secy, sci); |
| 1519 | if (!rx_sc) |
| 1520 | return ERR_PTR(-ENODEV); |
| 1521 | |
| 1522 | *secyp = secy; |
| 1523 | *devp = dev; |
| 1524 | |
| 1525 | return rx_sc; |
| 1526 | } |
| 1527 | |
| 1528 | static struct macsec_rx_sa *get_rxsa_from_nl(struct net *net, |
| 1529 | struct nlattr **attrs, |
| 1530 | struct nlattr **tb_rxsc, |
| 1531 | struct nlattr **tb_sa, |
| 1532 | struct net_device **devp, |
| 1533 | struct macsec_secy **secyp, |
| 1534 | struct macsec_rx_sc **scp, |
| 1535 | u8 *assoc_num) |
| 1536 | { |
| 1537 | struct macsec_rx_sc *rx_sc; |
| 1538 | struct macsec_rx_sa *rx_sa; |
| 1539 | |
| 1540 | if (!tb_sa[MACSEC_SA_ATTR_AN]) |
| 1541 | return ERR_PTR(-EINVAL); |
| 1542 | |
| 1543 | *assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); |
| 1544 | if (*assoc_num >= MACSEC_NUM_AN) |
| 1545 | return ERR_PTR(-EINVAL); |
| 1546 | |
| 1547 | rx_sc = get_rxsc_from_nl(net, attrs, tb_rxsc, devp, secyp); |
| 1548 | if (IS_ERR(rx_sc)) |
| 1549 | return ERR_CAST(rx_sc); |
| 1550 | |
| 1551 | rx_sa = rtnl_dereference(rx_sc->sa[*assoc_num]); |
| 1552 | if (!rx_sa) |
| 1553 | return ERR_PTR(-ENODEV); |
| 1554 | |
| 1555 | *scp = rx_sc; |
| 1556 | return rx_sa; |
| 1557 | } |
| 1558 | |
| 1559 | |
| 1560 | static const struct nla_policy macsec_genl_policy[NUM_MACSEC_ATTR] = { |
| 1561 | [MACSEC_ATTR_IFINDEX] = { .type = NLA_U32 }, |
| 1562 | [MACSEC_ATTR_RXSC_CONFIG] = { .type = NLA_NESTED }, |
| 1563 | [MACSEC_ATTR_SA_CONFIG] = { .type = NLA_NESTED }, |
| 1564 | }; |
| 1565 | |
| 1566 | static const struct nla_policy macsec_genl_rxsc_policy[NUM_MACSEC_RXSC_ATTR] = { |
| 1567 | [MACSEC_RXSC_ATTR_SCI] = { .type = NLA_U64 }, |
| 1568 | [MACSEC_RXSC_ATTR_ACTIVE] = { .type = NLA_U8 }, |
| 1569 | }; |
| 1570 | |
| 1571 | static const struct nla_policy macsec_genl_sa_policy[NUM_MACSEC_SA_ATTR] = { |
| 1572 | [MACSEC_SA_ATTR_AN] = { .type = NLA_U8 }, |
| 1573 | [MACSEC_SA_ATTR_ACTIVE] = { .type = NLA_U8 }, |
| 1574 | [MACSEC_SA_ATTR_PN] = { .type = NLA_U32 }, |
Sabrina Dubroca | 8acca6a | 2016-05-07 20:19:29 +0200 | [diff] [blame] | 1575 | [MACSEC_SA_ATTR_KEYID] = { .type = NLA_BINARY, |
| 1576 | .len = MACSEC_KEYID_LEN, }, |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1577 | [MACSEC_SA_ATTR_KEY] = { .type = NLA_BINARY, |
| 1578 | .len = MACSEC_MAX_KEY_LEN, }, |
| 1579 | }; |
| 1580 | |
| 1581 | static int parse_sa_config(struct nlattr **attrs, struct nlattr **tb_sa) |
| 1582 | { |
| 1583 | if (!attrs[MACSEC_ATTR_SA_CONFIG]) |
| 1584 | return -EINVAL; |
| 1585 | |
| 1586 | if (nla_parse_nested(tb_sa, MACSEC_SA_ATTR_MAX, attrs[MACSEC_ATTR_SA_CONFIG], |
| 1587 | macsec_genl_sa_policy)) |
| 1588 | return -EINVAL; |
| 1589 | |
| 1590 | return 0; |
| 1591 | } |
| 1592 | |
| 1593 | static int parse_rxsc_config(struct nlattr **attrs, struct nlattr **tb_rxsc) |
| 1594 | { |
| 1595 | if (!attrs[MACSEC_ATTR_RXSC_CONFIG]) |
| 1596 | return -EINVAL; |
| 1597 | |
| 1598 | if (nla_parse_nested(tb_rxsc, MACSEC_RXSC_ATTR_MAX, attrs[MACSEC_ATTR_RXSC_CONFIG], |
| 1599 | macsec_genl_rxsc_policy)) |
| 1600 | return -EINVAL; |
| 1601 | |
| 1602 | return 0; |
| 1603 | } |
| 1604 | |
| 1605 | static bool validate_add_rxsa(struct nlattr **attrs) |
| 1606 | { |
| 1607 | if (!attrs[MACSEC_SA_ATTR_AN] || |
| 1608 | !attrs[MACSEC_SA_ATTR_KEY] || |
| 1609 | !attrs[MACSEC_SA_ATTR_KEYID]) |
| 1610 | return false; |
| 1611 | |
| 1612 | if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) |
| 1613 | return false; |
| 1614 | |
| 1615 | if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) |
| 1616 | return false; |
| 1617 | |
| 1618 | if (attrs[MACSEC_SA_ATTR_ACTIVE]) { |
| 1619 | if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) |
| 1620 | return false; |
| 1621 | } |
| 1622 | |
Sabrina Dubroca | 8acca6a | 2016-05-07 20:19:29 +0200 | [diff] [blame] | 1623 | if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) |
| 1624 | return false; |
| 1625 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1626 | return true; |
| 1627 | } |
| 1628 | |
| 1629 | static int macsec_add_rxsa(struct sk_buff *skb, struct genl_info *info) |
| 1630 | { |
| 1631 | struct net_device *dev; |
| 1632 | struct nlattr **attrs = info->attrs; |
| 1633 | struct macsec_secy *secy; |
| 1634 | struct macsec_rx_sc *rx_sc; |
| 1635 | struct macsec_rx_sa *rx_sa; |
| 1636 | unsigned char assoc_num; |
| 1637 | struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; |
| 1638 | struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1639 | int err; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1640 | |
| 1641 | if (!attrs[MACSEC_ATTR_IFINDEX]) |
| 1642 | return -EINVAL; |
| 1643 | |
| 1644 | if (parse_sa_config(attrs, tb_sa)) |
| 1645 | return -EINVAL; |
| 1646 | |
| 1647 | if (parse_rxsc_config(attrs, tb_rxsc)) |
| 1648 | return -EINVAL; |
| 1649 | |
| 1650 | if (!validate_add_rxsa(tb_sa)) |
| 1651 | return -EINVAL; |
| 1652 | |
| 1653 | rtnl_lock(); |
| 1654 | rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); |
Sabrina Dubroca | 36b232c | 2016-07-29 15:37:54 +0200 | [diff] [blame] | 1655 | if (IS_ERR(rx_sc)) { |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1656 | rtnl_unlock(); |
| 1657 | return PTR_ERR(rx_sc); |
| 1658 | } |
| 1659 | |
| 1660 | assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); |
| 1661 | |
| 1662 | if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { |
| 1663 | pr_notice("macsec: nl: add_rxsa: bad key length: %d != %d\n", |
| 1664 | nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); |
| 1665 | rtnl_unlock(); |
| 1666 | return -EINVAL; |
| 1667 | } |
| 1668 | |
| 1669 | rx_sa = rtnl_dereference(rx_sc->sa[assoc_num]); |
| 1670 | if (rx_sa) { |
| 1671 | rtnl_unlock(); |
| 1672 | return -EBUSY; |
| 1673 | } |
| 1674 | |
| 1675 | rx_sa = kmalloc(sizeof(*rx_sa), GFP_KERNEL); |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1676 | if (!rx_sa) { |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1677 | rtnl_unlock(); |
| 1678 | return -ENOMEM; |
| 1679 | } |
| 1680 | |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1681 | err = init_rx_sa(rx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), |
| 1682 | secy->key_len, secy->icv_len); |
| 1683 | if (err < 0) { |
| 1684 | kfree(rx_sa); |
| 1685 | rtnl_unlock(); |
| 1686 | return err; |
| 1687 | } |
| 1688 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1689 | if (tb_sa[MACSEC_SA_ATTR_PN]) { |
| 1690 | spin_lock_bh(&rx_sa->lock); |
| 1691 | rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); |
| 1692 | spin_unlock_bh(&rx_sa->lock); |
| 1693 | } |
| 1694 | |
| 1695 | if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) |
| 1696 | rx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); |
| 1697 | |
Sabrina Dubroca | 1968a0b | 2016-05-18 13:34:40 +0200 | [diff] [blame] | 1698 | nla_memcpy(rx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1699 | rx_sa->sc = rx_sc; |
| 1700 | rcu_assign_pointer(rx_sc->sa[assoc_num], rx_sa); |
| 1701 | |
| 1702 | rtnl_unlock(); |
| 1703 | |
| 1704 | return 0; |
| 1705 | } |
| 1706 | |
| 1707 | static bool validate_add_rxsc(struct nlattr **attrs) |
| 1708 | { |
| 1709 | if (!attrs[MACSEC_RXSC_ATTR_SCI]) |
| 1710 | return false; |
| 1711 | |
| 1712 | if (attrs[MACSEC_RXSC_ATTR_ACTIVE]) { |
| 1713 | if (nla_get_u8(attrs[MACSEC_RXSC_ATTR_ACTIVE]) > 1) |
| 1714 | return false; |
| 1715 | } |
| 1716 | |
| 1717 | return true; |
| 1718 | } |
| 1719 | |
| 1720 | static int macsec_add_rxsc(struct sk_buff *skb, struct genl_info *info) |
| 1721 | { |
| 1722 | struct net_device *dev; |
| 1723 | sci_t sci = MACSEC_UNDEF_SCI; |
| 1724 | struct nlattr **attrs = info->attrs; |
| 1725 | struct macsec_rx_sc *rx_sc; |
| 1726 | struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; |
| 1727 | |
| 1728 | if (!attrs[MACSEC_ATTR_IFINDEX]) |
| 1729 | return -EINVAL; |
| 1730 | |
| 1731 | if (parse_rxsc_config(attrs, tb_rxsc)) |
| 1732 | return -EINVAL; |
| 1733 | |
| 1734 | if (!validate_add_rxsc(tb_rxsc)) |
| 1735 | return -EINVAL; |
| 1736 | |
| 1737 | rtnl_lock(); |
| 1738 | dev = get_dev_from_nl(genl_info_net(info), attrs); |
| 1739 | if (IS_ERR(dev)) { |
| 1740 | rtnl_unlock(); |
| 1741 | return PTR_ERR(dev); |
| 1742 | } |
| 1743 | |
| 1744 | sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); |
| 1745 | |
| 1746 | rx_sc = create_rx_sc(dev, sci); |
| 1747 | if (IS_ERR(rx_sc)) { |
| 1748 | rtnl_unlock(); |
| 1749 | return PTR_ERR(rx_sc); |
| 1750 | } |
| 1751 | |
| 1752 | if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) |
| 1753 | rx_sc->active = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); |
| 1754 | |
| 1755 | rtnl_unlock(); |
| 1756 | |
| 1757 | return 0; |
| 1758 | } |
| 1759 | |
| 1760 | static bool validate_add_txsa(struct nlattr **attrs) |
| 1761 | { |
| 1762 | if (!attrs[MACSEC_SA_ATTR_AN] || |
| 1763 | !attrs[MACSEC_SA_ATTR_PN] || |
| 1764 | !attrs[MACSEC_SA_ATTR_KEY] || |
| 1765 | !attrs[MACSEC_SA_ATTR_KEYID]) |
| 1766 | return false; |
| 1767 | |
| 1768 | if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) |
| 1769 | return false; |
| 1770 | |
| 1771 | if (nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) |
| 1772 | return false; |
| 1773 | |
| 1774 | if (attrs[MACSEC_SA_ATTR_ACTIVE]) { |
| 1775 | if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) |
| 1776 | return false; |
| 1777 | } |
| 1778 | |
Sabrina Dubroca | 8acca6a | 2016-05-07 20:19:29 +0200 | [diff] [blame] | 1779 | if (nla_len(attrs[MACSEC_SA_ATTR_KEYID]) != MACSEC_KEYID_LEN) |
| 1780 | return false; |
| 1781 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1782 | return true; |
| 1783 | } |
| 1784 | |
| 1785 | static int macsec_add_txsa(struct sk_buff *skb, struct genl_info *info) |
| 1786 | { |
| 1787 | struct net_device *dev; |
| 1788 | struct nlattr **attrs = info->attrs; |
| 1789 | struct macsec_secy *secy; |
| 1790 | struct macsec_tx_sc *tx_sc; |
| 1791 | struct macsec_tx_sa *tx_sa; |
| 1792 | unsigned char assoc_num; |
| 1793 | struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1794 | int err; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1795 | |
| 1796 | if (!attrs[MACSEC_ATTR_IFINDEX]) |
| 1797 | return -EINVAL; |
| 1798 | |
| 1799 | if (parse_sa_config(attrs, tb_sa)) |
| 1800 | return -EINVAL; |
| 1801 | |
| 1802 | if (!validate_add_txsa(tb_sa)) |
| 1803 | return -EINVAL; |
| 1804 | |
| 1805 | rtnl_lock(); |
| 1806 | dev = get_dev_from_nl(genl_info_net(info), attrs); |
| 1807 | if (IS_ERR(dev)) { |
| 1808 | rtnl_unlock(); |
| 1809 | return PTR_ERR(dev); |
| 1810 | } |
| 1811 | |
| 1812 | secy = &macsec_priv(dev)->secy; |
| 1813 | tx_sc = &secy->tx_sc; |
| 1814 | |
| 1815 | assoc_num = nla_get_u8(tb_sa[MACSEC_SA_ATTR_AN]); |
| 1816 | |
| 1817 | if (nla_len(tb_sa[MACSEC_SA_ATTR_KEY]) != secy->key_len) { |
| 1818 | pr_notice("macsec: nl: add_txsa: bad key length: %d != %d\n", |
| 1819 | nla_len(tb_sa[MACSEC_SA_ATTR_KEY]), secy->key_len); |
| 1820 | rtnl_unlock(); |
| 1821 | return -EINVAL; |
| 1822 | } |
| 1823 | |
| 1824 | tx_sa = rtnl_dereference(tx_sc->sa[assoc_num]); |
| 1825 | if (tx_sa) { |
| 1826 | rtnl_unlock(); |
| 1827 | return -EBUSY; |
| 1828 | } |
| 1829 | |
| 1830 | tx_sa = kmalloc(sizeof(*tx_sa), GFP_KERNEL); |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1831 | if (!tx_sa) { |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1832 | rtnl_unlock(); |
| 1833 | return -ENOMEM; |
| 1834 | } |
| 1835 | |
Davide Caratti | 34aedfe | 2016-07-22 15:07:57 +0200 | [diff] [blame] | 1836 | err = init_tx_sa(tx_sa, nla_data(tb_sa[MACSEC_SA_ATTR_KEY]), |
| 1837 | secy->key_len, secy->icv_len); |
| 1838 | if (err < 0) { |
| 1839 | kfree(tx_sa); |
| 1840 | rtnl_unlock(); |
| 1841 | return err; |
| 1842 | } |
| 1843 | |
Sabrina Dubroca | 1968a0b | 2016-05-18 13:34:40 +0200 | [diff] [blame] | 1844 | nla_memcpy(tx_sa->key.id, tb_sa[MACSEC_SA_ATTR_KEYID], MACSEC_KEYID_LEN); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 1845 | |
| 1846 | spin_lock_bh(&tx_sa->lock); |
| 1847 | tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); |
| 1848 | spin_unlock_bh(&tx_sa->lock); |
| 1849 | |
| 1850 | if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) |
| 1851 | tx_sa->active = !!nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); |
| 1852 | |
| 1853 | if (assoc_num == tx_sc->encoding_sa && tx_sa->active) |
| 1854 | secy->operational = true; |
| 1855 | |
| 1856 | rcu_assign_pointer(tx_sc->sa[assoc_num], tx_sa); |
| 1857 | |
| 1858 | rtnl_unlock(); |
| 1859 | |
| 1860 | return 0; |
| 1861 | } |
| 1862 | |
| 1863 | static int macsec_del_rxsa(struct sk_buff *skb, struct genl_info *info) |
| 1864 | { |
| 1865 | struct nlattr **attrs = info->attrs; |
| 1866 | struct net_device *dev; |
| 1867 | struct macsec_secy *secy; |
| 1868 | struct macsec_rx_sc *rx_sc; |
| 1869 | struct macsec_rx_sa *rx_sa; |
| 1870 | u8 assoc_num; |
| 1871 | struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; |
| 1872 | struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; |
| 1873 | |
| 1874 | if (!attrs[MACSEC_ATTR_IFINDEX]) |
| 1875 | return -EINVAL; |
| 1876 | |
| 1877 | if (parse_sa_config(attrs, tb_sa)) |
| 1878 | return -EINVAL; |
| 1879 | |
| 1880 | if (parse_rxsc_config(attrs, tb_rxsc)) |
| 1881 | return -EINVAL; |
| 1882 | |
| 1883 | rtnl_lock(); |
| 1884 | rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, |
| 1885 | &dev, &secy, &rx_sc, &assoc_num); |
| 1886 | if (IS_ERR(rx_sa)) { |
| 1887 | rtnl_unlock(); |
| 1888 | return PTR_ERR(rx_sa); |
| 1889 | } |
| 1890 | |
| 1891 | if (rx_sa->active) { |
| 1892 | rtnl_unlock(); |
| 1893 | return -EBUSY; |
| 1894 | } |
| 1895 | |
| 1896 | RCU_INIT_POINTER(rx_sc->sa[assoc_num], NULL); |
| 1897 | clear_rx_sa(rx_sa); |
| 1898 | |
| 1899 | rtnl_unlock(); |
| 1900 | |
| 1901 | return 0; |
| 1902 | } |
| 1903 | |
| 1904 | static int macsec_del_rxsc(struct sk_buff *skb, struct genl_info *info) |
| 1905 | { |
| 1906 | struct nlattr **attrs = info->attrs; |
| 1907 | struct net_device *dev; |
| 1908 | struct macsec_secy *secy; |
| 1909 | struct macsec_rx_sc *rx_sc; |
| 1910 | sci_t sci; |
| 1911 | struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; |
| 1912 | |
| 1913 | if (!attrs[MACSEC_ATTR_IFINDEX]) |
| 1914 | return -EINVAL; |
| 1915 | |
| 1916 | if (parse_rxsc_config(attrs, tb_rxsc)) |
| 1917 | return -EINVAL; |
| 1918 | |
| 1919 | if (!tb_rxsc[MACSEC_RXSC_ATTR_SCI]) |
| 1920 | return -EINVAL; |
| 1921 | |
| 1922 | rtnl_lock(); |
| 1923 | dev = get_dev_from_nl(genl_info_net(info), info->attrs); |
| 1924 | if (IS_ERR(dev)) { |
| 1925 | rtnl_unlock(); |
| 1926 | return PTR_ERR(dev); |
| 1927 | } |
| 1928 | |
| 1929 | secy = &macsec_priv(dev)->secy; |
| 1930 | sci = nla_get_sci(tb_rxsc[MACSEC_RXSC_ATTR_SCI]); |
| 1931 | |
| 1932 | rx_sc = del_rx_sc(secy, sci); |
| 1933 | if (!rx_sc) { |
| 1934 | rtnl_unlock(); |
| 1935 | return -ENODEV; |
| 1936 | } |
| 1937 | |
| 1938 | free_rx_sc(rx_sc); |
| 1939 | rtnl_unlock(); |
| 1940 | |
| 1941 | return 0; |
| 1942 | } |
| 1943 | |
| 1944 | static int macsec_del_txsa(struct sk_buff *skb, struct genl_info *info) |
| 1945 | { |
| 1946 | struct nlattr **attrs = info->attrs; |
| 1947 | struct net_device *dev; |
| 1948 | struct macsec_secy *secy; |
| 1949 | struct macsec_tx_sc *tx_sc; |
| 1950 | struct macsec_tx_sa *tx_sa; |
| 1951 | u8 assoc_num; |
| 1952 | struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; |
| 1953 | |
| 1954 | if (!attrs[MACSEC_ATTR_IFINDEX]) |
| 1955 | return -EINVAL; |
| 1956 | |
| 1957 | if (parse_sa_config(attrs, tb_sa)) |
| 1958 | return -EINVAL; |
| 1959 | |
| 1960 | rtnl_lock(); |
| 1961 | tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, |
| 1962 | &dev, &secy, &tx_sc, &assoc_num); |
| 1963 | if (IS_ERR(tx_sa)) { |
| 1964 | rtnl_unlock(); |
| 1965 | return PTR_ERR(tx_sa); |
| 1966 | } |
| 1967 | |
| 1968 | if (tx_sa->active) { |
| 1969 | rtnl_unlock(); |
| 1970 | return -EBUSY; |
| 1971 | } |
| 1972 | |
| 1973 | RCU_INIT_POINTER(tx_sc->sa[assoc_num], NULL); |
| 1974 | clear_tx_sa(tx_sa); |
| 1975 | |
| 1976 | rtnl_unlock(); |
| 1977 | |
| 1978 | return 0; |
| 1979 | } |
| 1980 | |
| 1981 | static bool validate_upd_sa(struct nlattr **attrs) |
| 1982 | { |
| 1983 | if (!attrs[MACSEC_SA_ATTR_AN] || |
| 1984 | attrs[MACSEC_SA_ATTR_KEY] || |
| 1985 | attrs[MACSEC_SA_ATTR_KEYID]) |
| 1986 | return false; |
| 1987 | |
| 1988 | if (nla_get_u8(attrs[MACSEC_SA_ATTR_AN]) >= MACSEC_NUM_AN) |
| 1989 | return false; |
| 1990 | |
| 1991 | if (attrs[MACSEC_SA_ATTR_PN] && nla_get_u32(attrs[MACSEC_SA_ATTR_PN]) == 0) |
| 1992 | return false; |
| 1993 | |
| 1994 | if (attrs[MACSEC_SA_ATTR_ACTIVE]) { |
| 1995 | if (nla_get_u8(attrs[MACSEC_SA_ATTR_ACTIVE]) > 1) |
| 1996 | return false; |
| 1997 | } |
| 1998 | |
| 1999 | return true; |
| 2000 | } |
| 2001 | |
| 2002 | static int macsec_upd_txsa(struct sk_buff *skb, struct genl_info *info) |
| 2003 | { |
| 2004 | struct nlattr **attrs = info->attrs; |
| 2005 | struct net_device *dev; |
| 2006 | struct macsec_secy *secy; |
| 2007 | struct macsec_tx_sc *tx_sc; |
| 2008 | struct macsec_tx_sa *tx_sa; |
| 2009 | u8 assoc_num; |
| 2010 | struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; |
| 2011 | |
| 2012 | if (!attrs[MACSEC_ATTR_IFINDEX]) |
| 2013 | return -EINVAL; |
| 2014 | |
| 2015 | if (parse_sa_config(attrs, tb_sa)) |
| 2016 | return -EINVAL; |
| 2017 | |
| 2018 | if (!validate_upd_sa(tb_sa)) |
| 2019 | return -EINVAL; |
| 2020 | |
| 2021 | rtnl_lock(); |
| 2022 | tx_sa = get_txsa_from_nl(genl_info_net(info), attrs, tb_sa, |
| 2023 | &dev, &secy, &tx_sc, &assoc_num); |
| 2024 | if (IS_ERR(tx_sa)) { |
| 2025 | rtnl_unlock(); |
| 2026 | return PTR_ERR(tx_sa); |
| 2027 | } |
| 2028 | |
| 2029 | if (tb_sa[MACSEC_SA_ATTR_PN]) { |
| 2030 | spin_lock_bh(&tx_sa->lock); |
| 2031 | tx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); |
| 2032 | spin_unlock_bh(&tx_sa->lock); |
| 2033 | } |
| 2034 | |
| 2035 | if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) |
| 2036 | tx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); |
| 2037 | |
| 2038 | if (assoc_num == tx_sc->encoding_sa) |
| 2039 | secy->operational = tx_sa->active; |
| 2040 | |
| 2041 | rtnl_unlock(); |
| 2042 | |
| 2043 | return 0; |
| 2044 | } |
| 2045 | |
| 2046 | static int macsec_upd_rxsa(struct sk_buff *skb, struct genl_info *info) |
| 2047 | { |
| 2048 | struct nlattr **attrs = info->attrs; |
| 2049 | struct net_device *dev; |
| 2050 | struct macsec_secy *secy; |
| 2051 | struct macsec_rx_sc *rx_sc; |
| 2052 | struct macsec_rx_sa *rx_sa; |
| 2053 | u8 assoc_num; |
| 2054 | struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; |
| 2055 | struct nlattr *tb_sa[MACSEC_SA_ATTR_MAX + 1]; |
| 2056 | |
| 2057 | if (!attrs[MACSEC_ATTR_IFINDEX]) |
| 2058 | return -EINVAL; |
| 2059 | |
| 2060 | if (parse_rxsc_config(attrs, tb_rxsc)) |
| 2061 | return -EINVAL; |
| 2062 | |
| 2063 | if (parse_sa_config(attrs, tb_sa)) |
| 2064 | return -EINVAL; |
| 2065 | |
| 2066 | if (!validate_upd_sa(tb_sa)) |
| 2067 | return -EINVAL; |
| 2068 | |
| 2069 | rtnl_lock(); |
| 2070 | rx_sa = get_rxsa_from_nl(genl_info_net(info), attrs, tb_rxsc, tb_sa, |
| 2071 | &dev, &secy, &rx_sc, &assoc_num); |
| 2072 | if (IS_ERR(rx_sa)) { |
| 2073 | rtnl_unlock(); |
| 2074 | return PTR_ERR(rx_sa); |
| 2075 | } |
| 2076 | |
| 2077 | if (tb_sa[MACSEC_SA_ATTR_PN]) { |
| 2078 | spin_lock_bh(&rx_sa->lock); |
| 2079 | rx_sa->next_pn = nla_get_u32(tb_sa[MACSEC_SA_ATTR_PN]); |
| 2080 | spin_unlock_bh(&rx_sa->lock); |
| 2081 | } |
| 2082 | |
| 2083 | if (tb_sa[MACSEC_SA_ATTR_ACTIVE]) |
| 2084 | rx_sa->active = nla_get_u8(tb_sa[MACSEC_SA_ATTR_ACTIVE]); |
| 2085 | |
| 2086 | rtnl_unlock(); |
| 2087 | return 0; |
| 2088 | } |
| 2089 | |
| 2090 | static int macsec_upd_rxsc(struct sk_buff *skb, struct genl_info *info) |
| 2091 | { |
| 2092 | struct nlattr **attrs = info->attrs; |
| 2093 | struct net_device *dev; |
| 2094 | struct macsec_secy *secy; |
| 2095 | struct macsec_rx_sc *rx_sc; |
| 2096 | struct nlattr *tb_rxsc[MACSEC_RXSC_ATTR_MAX + 1]; |
| 2097 | |
| 2098 | if (!attrs[MACSEC_ATTR_IFINDEX]) |
| 2099 | return -EINVAL; |
| 2100 | |
| 2101 | if (parse_rxsc_config(attrs, tb_rxsc)) |
| 2102 | return -EINVAL; |
| 2103 | |
| 2104 | if (!validate_add_rxsc(tb_rxsc)) |
| 2105 | return -EINVAL; |
| 2106 | |
| 2107 | rtnl_lock(); |
| 2108 | rx_sc = get_rxsc_from_nl(genl_info_net(info), attrs, tb_rxsc, &dev, &secy); |
| 2109 | if (IS_ERR(rx_sc)) { |
| 2110 | rtnl_unlock(); |
| 2111 | return PTR_ERR(rx_sc); |
| 2112 | } |
| 2113 | |
| 2114 | if (tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]) { |
| 2115 | bool new = !!nla_get_u8(tb_rxsc[MACSEC_RXSC_ATTR_ACTIVE]); |
| 2116 | |
| 2117 | if (rx_sc->active != new) |
| 2118 | secy->n_rx_sc += new ? 1 : -1; |
| 2119 | |
| 2120 | rx_sc->active = new; |
| 2121 | } |
| 2122 | |
| 2123 | rtnl_unlock(); |
| 2124 | |
| 2125 | return 0; |
| 2126 | } |
| 2127 | |
| 2128 | static int copy_tx_sa_stats(struct sk_buff *skb, |
| 2129 | struct macsec_tx_sa_stats __percpu *pstats) |
| 2130 | { |
| 2131 | struct macsec_tx_sa_stats sum = {0, }; |
| 2132 | int cpu; |
| 2133 | |
| 2134 | for_each_possible_cpu(cpu) { |
| 2135 | const struct macsec_tx_sa_stats *stats = per_cpu_ptr(pstats, cpu); |
| 2136 | |
| 2137 | sum.OutPktsProtected += stats->OutPktsProtected; |
| 2138 | sum.OutPktsEncrypted += stats->OutPktsEncrypted; |
| 2139 | } |
| 2140 | |
| 2141 | if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_PROTECTED, sum.OutPktsProtected) || |
| 2142 | nla_put_u32(skb, MACSEC_SA_STATS_ATTR_OUT_PKTS_ENCRYPTED, sum.OutPktsEncrypted)) |
| 2143 | return -EMSGSIZE; |
| 2144 | |
| 2145 | return 0; |
| 2146 | } |
| 2147 | |
| 2148 | static int copy_rx_sa_stats(struct sk_buff *skb, |
| 2149 | struct macsec_rx_sa_stats __percpu *pstats) |
| 2150 | { |
| 2151 | struct macsec_rx_sa_stats sum = {0, }; |
| 2152 | int cpu; |
| 2153 | |
| 2154 | for_each_possible_cpu(cpu) { |
| 2155 | const struct macsec_rx_sa_stats *stats = per_cpu_ptr(pstats, cpu); |
| 2156 | |
| 2157 | sum.InPktsOK += stats->InPktsOK; |
| 2158 | sum.InPktsInvalid += stats->InPktsInvalid; |
| 2159 | sum.InPktsNotValid += stats->InPktsNotValid; |
| 2160 | sum.InPktsNotUsingSA += stats->InPktsNotUsingSA; |
| 2161 | sum.InPktsUnusedSA += stats->InPktsUnusedSA; |
| 2162 | } |
| 2163 | |
| 2164 | if (nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_OK, sum.InPktsOK) || |
| 2165 | nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_INVALID, sum.InPktsInvalid) || |
| 2166 | nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_VALID, sum.InPktsNotValid) || |
| 2167 | nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_NOT_USING_SA, sum.InPktsNotUsingSA) || |
| 2168 | nla_put_u32(skb, MACSEC_SA_STATS_ATTR_IN_PKTS_UNUSED_SA, sum.InPktsUnusedSA)) |
| 2169 | return -EMSGSIZE; |
| 2170 | |
| 2171 | return 0; |
| 2172 | } |
| 2173 | |
| 2174 | static int copy_rx_sc_stats(struct sk_buff *skb, |
| 2175 | struct pcpu_rx_sc_stats __percpu *pstats) |
| 2176 | { |
| 2177 | struct macsec_rx_sc_stats sum = {0, }; |
| 2178 | int cpu; |
| 2179 | |
| 2180 | for_each_possible_cpu(cpu) { |
| 2181 | const struct pcpu_rx_sc_stats *stats; |
| 2182 | struct macsec_rx_sc_stats tmp; |
| 2183 | unsigned int start; |
| 2184 | |
| 2185 | stats = per_cpu_ptr(pstats, cpu); |
| 2186 | do { |
| 2187 | start = u64_stats_fetch_begin_irq(&stats->syncp); |
| 2188 | memcpy(&tmp, &stats->stats, sizeof(tmp)); |
| 2189 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
| 2190 | |
| 2191 | sum.InOctetsValidated += tmp.InOctetsValidated; |
| 2192 | sum.InOctetsDecrypted += tmp.InOctetsDecrypted; |
| 2193 | sum.InPktsUnchecked += tmp.InPktsUnchecked; |
| 2194 | sum.InPktsDelayed += tmp.InPktsDelayed; |
| 2195 | sum.InPktsOK += tmp.InPktsOK; |
| 2196 | sum.InPktsInvalid += tmp.InPktsInvalid; |
| 2197 | sum.InPktsLate += tmp.InPktsLate; |
| 2198 | sum.InPktsNotValid += tmp.InPktsNotValid; |
| 2199 | sum.InPktsNotUsingSA += tmp.InPktsNotUsingSA; |
| 2200 | sum.InPktsUnusedSA += tmp.InPktsUnusedSA; |
| 2201 | } |
| 2202 | |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 2203 | if (nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_VALIDATED, |
| 2204 | sum.InOctetsValidated, |
| 2205 | MACSEC_RXSC_STATS_ATTR_PAD) || |
| 2206 | nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_OCTETS_DECRYPTED, |
| 2207 | sum.InOctetsDecrypted, |
| 2208 | MACSEC_RXSC_STATS_ATTR_PAD) || |
| 2209 | nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNCHECKED, |
| 2210 | sum.InPktsUnchecked, |
| 2211 | MACSEC_RXSC_STATS_ATTR_PAD) || |
| 2212 | nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_DELAYED, |
| 2213 | sum.InPktsDelayed, |
| 2214 | MACSEC_RXSC_STATS_ATTR_PAD) || |
| 2215 | nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_OK, |
| 2216 | sum.InPktsOK, |
| 2217 | MACSEC_RXSC_STATS_ATTR_PAD) || |
| 2218 | nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_INVALID, |
| 2219 | sum.InPktsInvalid, |
| 2220 | MACSEC_RXSC_STATS_ATTR_PAD) || |
| 2221 | nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_LATE, |
| 2222 | sum.InPktsLate, |
| 2223 | MACSEC_RXSC_STATS_ATTR_PAD) || |
| 2224 | nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_VALID, |
| 2225 | sum.InPktsNotValid, |
| 2226 | MACSEC_RXSC_STATS_ATTR_PAD) || |
| 2227 | nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_NOT_USING_SA, |
| 2228 | sum.InPktsNotUsingSA, |
| 2229 | MACSEC_RXSC_STATS_ATTR_PAD) || |
| 2230 | nla_put_u64_64bit(skb, MACSEC_RXSC_STATS_ATTR_IN_PKTS_UNUSED_SA, |
| 2231 | sum.InPktsUnusedSA, |
| 2232 | MACSEC_RXSC_STATS_ATTR_PAD)) |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2233 | return -EMSGSIZE; |
| 2234 | |
| 2235 | return 0; |
| 2236 | } |
| 2237 | |
| 2238 | static int copy_tx_sc_stats(struct sk_buff *skb, |
| 2239 | struct pcpu_tx_sc_stats __percpu *pstats) |
| 2240 | { |
| 2241 | struct macsec_tx_sc_stats sum = {0, }; |
| 2242 | int cpu; |
| 2243 | |
| 2244 | for_each_possible_cpu(cpu) { |
| 2245 | const struct pcpu_tx_sc_stats *stats; |
| 2246 | struct macsec_tx_sc_stats tmp; |
| 2247 | unsigned int start; |
| 2248 | |
| 2249 | stats = per_cpu_ptr(pstats, cpu); |
| 2250 | do { |
| 2251 | start = u64_stats_fetch_begin_irq(&stats->syncp); |
| 2252 | memcpy(&tmp, &stats->stats, sizeof(tmp)); |
| 2253 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
| 2254 | |
| 2255 | sum.OutPktsProtected += tmp.OutPktsProtected; |
| 2256 | sum.OutPktsEncrypted += tmp.OutPktsEncrypted; |
| 2257 | sum.OutOctetsProtected += tmp.OutOctetsProtected; |
| 2258 | sum.OutOctetsEncrypted += tmp.OutOctetsEncrypted; |
| 2259 | } |
| 2260 | |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 2261 | if (nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_PROTECTED, |
| 2262 | sum.OutPktsProtected, |
| 2263 | MACSEC_TXSC_STATS_ATTR_PAD) || |
| 2264 | nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_PKTS_ENCRYPTED, |
| 2265 | sum.OutPktsEncrypted, |
| 2266 | MACSEC_TXSC_STATS_ATTR_PAD) || |
| 2267 | nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_PROTECTED, |
| 2268 | sum.OutOctetsProtected, |
| 2269 | MACSEC_TXSC_STATS_ATTR_PAD) || |
| 2270 | nla_put_u64_64bit(skb, MACSEC_TXSC_STATS_ATTR_OUT_OCTETS_ENCRYPTED, |
| 2271 | sum.OutOctetsEncrypted, |
| 2272 | MACSEC_TXSC_STATS_ATTR_PAD)) |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2273 | return -EMSGSIZE; |
| 2274 | |
| 2275 | return 0; |
| 2276 | } |
| 2277 | |
| 2278 | static int copy_secy_stats(struct sk_buff *skb, |
| 2279 | struct pcpu_secy_stats __percpu *pstats) |
| 2280 | { |
| 2281 | struct macsec_dev_stats sum = {0, }; |
| 2282 | int cpu; |
| 2283 | |
| 2284 | for_each_possible_cpu(cpu) { |
| 2285 | const struct pcpu_secy_stats *stats; |
| 2286 | struct macsec_dev_stats tmp; |
| 2287 | unsigned int start; |
| 2288 | |
| 2289 | stats = per_cpu_ptr(pstats, cpu); |
| 2290 | do { |
| 2291 | start = u64_stats_fetch_begin_irq(&stats->syncp); |
| 2292 | memcpy(&tmp, &stats->stats, sizeof(tmp)); |
| 2293 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
| 2294 | |
| 2295 | sum.OutPktsUntagged += tmp.OutPktsUntagged; |
| 2296 | sum.InPktsUntagged += tmp.InPktsUntagged; |
| 2297 | sum.OutPktsTooLong += tmp.OutPktsTooLong; |
| 2298 | sum.InPktsNoTag += tmp.InPktsNoTag; |
| 2299 | sum.InPktsBadTag += tmp.InPktsBadTag; |
| 2300 | sum.InPktsUnknownSCI += tmp.InPktsUnknownSCI; |
| 2301 | sum.InPktsNoSCI += tmp.InPktsNoSCI; |
| 2302 | sum.InPktsOverrun += tmp.InPktsOverrun; |
| 2303 | } |
| 2304 | |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 2305 | if (nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_UNTAGGED, |
| 2306 | sum.OutPktsUntagged, |
| 2307 | MACSEC_SECY_STATS_ATTR_PAD) || |
| 2308 | nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNTAGGED, |
| 2309 | sum.InPktsUntagged, |
| 2310 | MACSEC_SECY_STATS_ATTR_PAD) || |
| 2311 | nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_OUT_PKTS_TOO_LONG, |
| 2312 | sum.OutPktsTooLong, |
| 2313 | MACSEC_SECY_STATS_ATTR_PAD) || |
| 2314 | nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_TAG, |
| 2315 | sum.InPktsNoTag, |
| 2316 | MACSEC_SECY_STATS_ATTR_PAD) || |
| 2317 | nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_BAD_TAG, |
| 2318 | sum.InPktsBadTag, |
| 2319 | MACSEC_SECY_STATS_ATTR_PAD) || |
| 2320 | nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_UNKNOWN_SCI, |
| 2321 | sum.InPktsUnknownSCI, |
| 2322 | MACSEC_SECY_STATS_ATTR_PAD) || |
| 2323 | nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_NO_SCI, |
| 2324 | sum.InPktsNoSCI, |
| 2325 | MACSEC_SECY_STATS_ATTR_PAD) || |
| 2326 | nla_put_u64_64bit(skb, MACSEC_SECY_STATS_ATTR_IN_PKTS_OVERRUN, |
| 2327 | sum.InPktsOverrun, |
| 2328 | MACSEC_SECY_STATS_ATTR_PAD)) |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2329 | return -EMSGSIZE; |
| 2330 | |
| 2331 | return 0; |
| 2332 | } |
| 2333 | |
| 2334 | static int nla_put_secy(struct macsec_secy *secy, struct sk_buff *skb) |
| 2335 | { |
| 2336 | struct macsec_tx_sc *tx_sc = &secy->tx_sc; |
| 2337 | struct nlattr *secy_nest = nla_nest_start(skb, MACSEC_ATTR_SECY); |
| 2338 | |
| 2339 | if (!secy_nest) |
| 2340 | return 1; |
| 2341 | |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 2342 | if (nla_put_sci(skb, MACSEC_SECY_ATTR_SCI, secy->sci, |
| 2343 | MACSEC_SECY_ATTR_PAD) || |
| 2344 | nla_put_u64_64bit(skb, MACSEC_SECY_ATTR_CIPHER_SUITE, |
David S. Miller | c0cc531 | 2016-04-27 15:43:10 -0400 | [diff] [blame] | 2345 | MACSEC_DEFAULT_CIPHER_ID, |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 2346 | MACSEC_SECY_ATTR_PAD) || |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2347 | nla_put_u8(skb, MACSEC_SECY_ATTR_ICV_LEN, secy->icv_len) || |
| 2348 | nla_put_u8(skb, MACSEC_SECY_ATTR_OPER, secy->operational) || |
| 2349 | nla_put_u8(skb, MACSEC_SECY_ATTR_PROTECT, secy->protect_frames) || |
| 2350 | nla_put_u8(skb, MACSEC_SECY_ATTR_REPLAY, secy->replay_protect) || |
| 2351 | nla_put_u8(skb, MACSEC_SECY_ATTR_VALIDATE, secy->validate_frames) || |
| 2352 | nla_put_u8(skb, MACSEC_SECY_ATTR_ENCRYPT, tx_sc->encrypt) || |
| 2353 | nla_put_u8(skb, MACSEC_SECY_ATTR_INC_SCI, tx_sc->send_sci) || |
| 2354 | nla_put_u8(skb, MACSEC_SECY_ATTR_ES, tx_sc->end_station) || |
| 2355 | nla_put_u8(skb, MACSEC_SECY_ATTR_SCB, tx_sc->scb) || |
| 2356 | nla_put_u8(skb, MACSEC_SECY_ATTR_ENCODING_SA, tx_sc->encoding_sa)) |
| 2357 | goto cancel; |
| 2358 | |
| 2359 | if (secy->replay_protect) { |
| 2360 | if (nla_put_u32(skb, MACSEC_SECY_ATTR_WINDOW, secy->replay_window)) |
| 2361 | goto cancel; |
| 2362 | } |
| 2363 | |
| 2364 | nla_nest_end(skb, secy_nest); |
| 2365 | return 0; |
| 2366 | |
| 2367 | cancel: |
| 2368 | nla_nest_cancel(skb, secy_nest); |
| 2369 | return 1; |
| 2370 | } |
| 2371 | |
| 2372 | static int dump_secy(struct macsec_secy *secy, struct net_device *dev, |
| 2373 | struct sk_buff *skb, struct netlink_callback *cb) |
| 2374 | { |
| 2375 | struct macsec_rx_sc *rx_sc; |
| 2376 | struct macsec_tx_sc *tx_sc = &secy->tx_sc; |
| 2377 | struct nlattr *txsa_list, *rxsc_list; |
| 2378 | int i, j; |
| 2379 | void *hdr; |
| 2380 | struct nlattr *attr; |
| 2381 | |
| 2382 | hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, |
| 2383 | &macsec_fam, NLM_F_MULTI, MACSEC_CMD_GET_TXSC); |
| 2384 | if (!hdr) |
| 2385 | return -EMSGSIZE; |
| 2386 | |
Sabrina Dubroca | 96cfc50 | 2016-04-22 11:28:05 +0200 | [diff] [blame] | 2387 | genl_dump_check_consistent(cb, hdr, &macsec_fam); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2388 | |
| 2389 | if (nla_put_u32(skb, MACSEC_ATTR_IFINDEX, dev->ifindex)) |
| 2390 | goto nla_put_failure; |
| 2391 | |
| 2392 | if (nla_put_secy(secy, skb)) |
| 2393 | goto nla_put_failure; |
| 2394 | |
| 2395 | attr = nla_nest_start(skb, MACSEC_ATTR_TXSC_STATS); |
| 2396 | if (!attr) |
| 2397 | goto nla_put_failure; |
| 2398 | if (copy_tx_sc_stats(skb, tx_sc->stats)) { |
| 2399 | nla_nest_cancel(skb, attr); |
| 2400 | goto nla_put_failure; |
| 2401 | } |
| 2402 | nla_nest_end(skb, attr); |
| 2403 | |
| 2404 | attr = nla_nest_start(skb, MACSEC_ATTR_SECY_STATS); |
| 2405 | if (!attr) |
| 2406 | goto nla_put_failure; |
| 2407 | if (copy_secy_stats(skb, macsec_priv(dev)->stats)) { |
| 2408 | nla_nest_cancel(skb, attr); |
| 2409 | goto nla_put_failure; |
| 2410 | } |
| 2411 | nla_nest_end(skb, attr); |
| 2412 | |
| 2413 | txsa_list = nla_nest_start(skb, MACSEC_ATTR_TXSA_LIST); |
| 2414 | if (!txsa_list) |
| 2415 | goto nla_put_failure; |
| 2416 | for (i = 0, j = 1; i < MACSEC_NUM_AN; i++) { |
| 2417 | struct macsec_tx_sa *tx_sa = rtnl_dereference(tx_sc->sa[i]); |
| 2418 | struct nlattr *txsa_nest; |
| 2419 | |
| 2420 | if (!tx_sa) |
| 2421 | continue; |
| 2422 | |
| 2423 | txsa_nest = nla_nest_start(skb, j++); |
| 2424 | if (!txsa_nest) { |
| 2425 | nla_nest_cancel(skb, txsa_list); |
| 2426 | goto nla_put_failure; |
| 2427 | } |
| 2428 | |
| 2429 | if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || |
| 2430 | nla_put_u32(skb, MACSEC_SA_ATTR_PN, tx_sa->next_pn) || |
Sabrina Dubroca | 8acca6a | 2016-05-07 20:19:29 +0200 | [diff] [blame] | 2431 | nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, tx_sa->key.id) || |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2432 | nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, tx_sa->active)) { |
| 2433 | nla_nest_cancel(skb, txsa_nest); |
| 2434 | nla_nest_cancel(skb, txsa_list); |
| 2435 | goto nla_put_failure; |
| 2436 | } |
| 2437 | |
| 2438 | attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); |
| 2439 | if (!attr) { |
| 2440 | nla_nest_cancel(skb, txsa_nest); |
| 2441 | nla_nest_cancel(skb, txsa_list); |
| 2442 | goto nla_put_failure; |
| 2443 | } |
| 2444 | if (copy_tx_sa_stats(skb, tx_sa->stats)) { |
| 2445 | nla_nest_cancel(skb, attr); |
| 2446 | nla_nest_cancel(skb, txsa_nest); |
| 2447 | nla_nest_cancel(skb, txsa_list); |
| 2448 | goto nla_put_failure; |
| 2449 | } |
| 2450 | nla_nest_end(skb, attr); |
| 2451 | |
| 2452 | nla_nest_end(skb, txsa_nest); |
| 2453 | } |
| 2454 | nla_nest_end(skb, txsa_list); |
| 2455 | |
| 2456 | rxsc_list = nla_nest_start(skb, MACSEC_ATTR_RXSC_LIST); |
| 2457 | if (!rxsc_list) |
| 2458 | goto nla_put_failure; |
| 2459 | |
| 2460 | j = 1; |
| 2461 | for_each_rxsc_rtnl(secy, rx_sc) { |
| 2462 | int k; |
| 2463 | struct nlattr *rxsa_list; |
| 2464 | struct nlattr *rxsc_nest = nla_nest_start(skb, j++); |
| 2465 | |
| 2466 | if (!rxsc_nest) { |
| 2467 | nla_nest_cancel(skb, rxsc_list); |
| 2468 | goto nla_put_failure; |
| 2469 | } |
| 2470 | |
| 2471 | if (nla_put_u8(skb, MACSEC_RXSC_ATTR_ACTIVE, rx_sc->active) || |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 2472 | nla_put_sci(skb, MACSEC_RXSC_ATTR_SCI, rx_sc->sci, |
| 2473 | MACSEC_RXSC_ATTR_PAD)) { |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2474 | nla_nest_cancel(skb, rxsc_nest); |
| 2475 | nla_nest_cancel(skb, rxsc_list); |
| 2476 | goto nla_put_failure; |
| 2477 | } |
| 2478 | |
| 2479 | attr = nla_nest_start(skb, MACSEC_RXSC_ATTR_STATS); |
| 2480 | if (!attr) { |
| 2481 | nla_nest_cancel(skb, rxsc_nest); |
| 2482 | nla_nest_cancel(skb, rxsc_list); |
| 2483 | goto nla_put_failure; |
| 2484 | } |
| 2485 | if (copy_rx_sc_stats(skb, rx_sc->stats)) { |
| 2486 | nla_nest_cancel(skb, attr); |
| 2487 | nla_nest_cancel(skb, rxsc_nest); |
| 2488 | nla_nest_cancel(skb, rxsc_list); |
| 2489 | goto nla_put_failure; |
| 2490 | } |
| 2491 | nla_nest_end(skb, attr); |
| 2492 | |
| 2493 | rxsa_list = nla_nest_start(skb, MACSEC_RXSC_ATTR_SA_LIST); |
| 2494 | if (!rxsa_list) { |
| 2495 | nla_nest_cancel(skb, rxsc_nest); |
| 2496 | nla_nest_cancel(skb, rxsc_list); |
| 2497 | goto nla_put_failure; |
| 2498 | } |
| 2499 | |
| 2500 | for (i = 0, k = 1; i < MACSEC_NUM_AN; i++) { |
| 2501 | struct macsec_rx_sa *rx_sa = rtnl_dereference(rx_sc->sa[i]); |
| 2502 | struct nlattr *rxsa_nest; |
| 2503 | |
| 2504 | if (!rx_sa) |
| 2505 | continue; |
| 2506 | |
| 2507 | rxsa_nest = nla_nest_start(skb, k++); |
| 2508 | if (!rxsa_nest) { |
| 2509 | nla_nest_cancel(skb, rxsa_list); |
| 2510 | nla_nest_cancel(skb, rxsc_nest); |
| 2511 | nla_nest_cancel(skb, rxsc_list); |
| 2512 | goto nla_put_failure; |
| 2513 | } |
| 2514 | |
| 2515 | attr = nla_nest_start(skb, MACSEC_SA_ATTR_STATS); |
| 2516 | if (!attr) { |
| 2517 | nla_nest_cancel(skb, rxsa_list); |
| 2518 | nla_nest_cancel(skb, rxsc_nest); |
| 2519 | nla_nest_cancel(skb, rxsc_list); |
| 2520 | goto nla_put_failure; |
| 2521 | } |
| 2522 | if (copy_rx_sa_stats(skb, rx_sa->stats)) { |
| 2523 | nla_nest_cancel(skb, attr); |
| 2524 | nla_nest_cancel(skb, rxsa_list); |
| 2525 | nla_nest_cancel(skb, rxsc_nest); |
| 2526 | nla_nest_cancel(skb, rxsc_list); |
| 2527 | goto nla_put_failure; |
| 2528 | } |
| 2529 | nla_nest_end(skb, attr); |
| 2530 | |
| 2531 | if (nla_put_u8(skb, MACSEC_SA_ATTR_AN, i) || |
| 2532 | nla_put_u32(skb, MACSEC_SA_ATTR_PN, rx_sa->next_pn) || |
Sabrina Dubroca | 8acca6a | 2016-05-07 20:19:29 +0200 | [diff] [blame] | 2533 | nla_put(skb, MACSEC_SA_ATTR_KEYID, MACSEC_KEYID_LEN, rx_sa->key.id) || |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2534 | nla_put_u8(skb, MACSEC_SA_ATTR_ACTIVE, rx_sa->active)) { |
| 2535 | nla_nest_cancel(skb, rxsa_nest); |
| 2536 | nla_nest_cancel(skb, rxsc_nest); |
| 2537 | nla_nest_cancel(skb, rxsc_list); |
| 2538 | goto nla_put_failure; |
| 2539 | } |
| 2540 | nla_nest_end(skb, rxsa_nest); |
| 2541 | } |
| 2542 | |
| 2543 | nla_nest_end(skb, rxsa_list); |
| 2544 | nla_nest_end(skb, rxsc_nest); |
| 2545 | } |
| 2546 | |
| 2547 | nla_nest_end(skb, rxsc_list); |
| 2548 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2549 | genlmsg_end(skb, hdr); |
| 2550 | |
| 2551 | return 0; |
| 2552 | |
| 2553 | nla_put_failure: |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2554 | genlmsg_cancel(skb, hdr); |
| 2555 | return -EMSGSIZE; |
| 2556 | } |
| 2557 | |
Sabrina Dubroca | 96cfc50 | 2016-04-22 11:28:05 +0200 | [diff] [blame] | 2558 | static int macsec_generation = 1; /* protected by RTNL */ |
| 2559 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2560 | static int macsec_dump_txsc(struct sk_buff *skb, struct netlink_callback *cb) |
| 2561 | { |
| 2562 | struct net *net = sock_net(skb->sk); |
| 2563 | struct net_device *dev; |
| 2564 | int dev_idx, d; |
| 2565 | |
| 2566 | dev_idx = cb->args[0]; |
| 2567 | |
| 2568 | d = 0; |
Sabrina Dubroca | c10c63e | 2016-04-22 11:28:02 +0200 | [diff] [blame] | 2569 | rtnl_lock(); |
Sabrina Dubroca | 96cfc50 | 2016-04-22 11:28:05 +0200 | [diff] [blame] | 2570 | |
| 2571 | cb->seq = macsec_generation; |
| 2572 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2573 | for_each_netdev(net, dev) { |
| 2574 | struct macsec_secy *secy; |
| 2575 | |
| 2576 | if (d < dev_idx) |
| 2577 | goto next; |
| 2578 | |
| 2579 | if (!netif_is_macsec(dev)) |
| 2580 | goto next; |
| 2581 | |
| 2582 | secy = &macsec_priv(dev)->secy; |
| 2583 | if (dump_secy(secy, dev, skb, cb) < 0) |
| 2584 | goto done; |
| 2585 | next: |
| 2586 | d++; |
| 2587 | } |
| 2588 | |
| 2589 | done: |
Sabrina Dubroca | c10c63e | 2016-04-22 11:28:02 +0200 | [diff] [blame] | 2590 | rtnl_unlock(); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2591 | cb->args[0] = d; |
| 2592 | return skb->len; |
| 2593 | } |
| 2594 | |
| 2595 | static const struct genl_ops macsec_genl_ops[] = { |
| 2596 | { |
| 2597 | .cmd = MACSEC_CMD_GET_TXSC, |
| 2598 | .dumpit = macsec_dump_txsc, |
| 2599 | .policy = macsec_genl_policy, |
| 2600 | }, |
| 2601 | { |
| 2602 | .cmd = MACSEC_CMD_ADD_RXSC, |
| 2603 | .doit = macsec_add_rxsc, |
| 2604 | .policy = macsec_genl_policy, |
| 2605 | .flags = GENL_ADMIN_PERM, |
| 2606 | }, |
| 2607 | { |
| 2608 | .cmd = MACSEC_CMD_DEL_RXSC, |
| 2609 | .doit = macsec_del_rxsc, |
| 2610 | .policy = macsec_genl_policy, |
| 2611 | .flags = GENL_ADMIN_PERM, |
| 2612 | }, |
| 2613 | { |
| 2614 | .cmd = MACSEC_CMD_UPD_RXSC, |
| 2615 | .doit = macsec_upd_rxsc, |
| 2616 | .policy = macsec_genl_policy, |
| 2617 | .flags = GENL_ADMIN_PERM, |
| 2618 | }, |
| 2619 | { |
| 2620 | .cmd = MACSEC_CMD_ADD_TXSA, |
| 2621 | .doit = macsec_add_txsa, |
| 2622 | .policy = macsec_genl_policy, |
| 2623 | .flags = GENL_ADMIN_PERM, |
| 2624 | }, |
| 2625 | { |
| 2626 | .cmd = MACSEC_CMD_DEL_TXSA, |
| 2627 | .doit = macsec_del_txsa, |
| 2628 | .policy = macsec_genl_policy, |
| 2629 | .flags = GENL_ADMIN_PERM, |
| 2630 | }, |
| 2631 | { |
| 2632 | .cmd = MACSEC_CMD_UPD_TXSA, |
| 2633 | .doit = macsec_upd_txsa, |
| 2634 | .policy = macsec_genl_policy, |
| 2635 | .flags = GENL_ADMIN_PERM, |
| 2636 | }, |
| 2637 | { |
| 2638 | .cmd = MACSEC_CMD_ADD_RXSA, |
| 2639 | .doit = macsec_add_rxsa, |
| 2640 | .policy = macsec_genl_policy, |
| 2641 | .flags = GENL_ADMIN_PERM, |
| 2642 | }, |
| 2643 | { |
| 2644 | .cmd = MACSEC_CMD_DEL_RXSA, |
| 2645 | .doit = macsec_del_rxsa, |
| 2646 | .policy = macsec_genl_policy, |
| 2647 | .flags = GENL_ADMIN_PERM, |
| 2648 | }, |
| 2649 | { |
| 2650 | .cmd = MACSEC_CMD_UPD_RXSA, |
| 2651 | .doit = macsec_upd_rxsa, |
| 2652 | .policy = macsec_genl_policy, |
| 2653 | .flags = GENL_ADMIN_PERM, |
| 2654 | }, |
| 2655 | }; |
| 2656 | |
| 2657 | static netdev_tx_t macsec_start_xmit(struct sk_buff *skb, |
| 2658 | struct net_device *dev) |
| 2659 | { |
| 2660 | struct macsec_dev *macsec = netdev_priv(dev); |
| 2661 | struct macsec_secy *secy = &macsec->secy; |
| 2662 | struct pcpu_secy_stats *secy_stats; |
| 2663 | int ret, len; |
| 2664 | |
| 2665 | /* 10.5 */ |
| 2666 | if (!secy->protect_frames) { |
| 2667 | secy_stats = this_cpu_ptr(macsec->stats); |
| 2668 | u64_stats_update_begin(&secy_stats->syncp); |
| 2669 | secy_stats->stats.OutPktsUntagged++; |
| 2670 | u64_stats_update_end(&secy_stats->syncp); |
Daniel Borkmann | 79c6222 | 2016-07-01 00:00:54 +0200 | [diff] [blame] | 2671 | skb->dev = macsec->real_dev; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2672 | len = skb->len; |
| 2673 | ret = dev_queue_xmit(skb); |
| 2674 | count_tx(dev, ret, len); |
| 2675 | return ret; |
| 2676 | } |
| 2677 | |
| 2678 | if (!secy->operational) { |
| 2679 | kfree_skb(skb); |
| 2680 | dev->stats.tx_dropped++; |
| 2681 | return NETDEV_TX_OK; |
| 2682 | } |
| 2683 | |
| 2684 | skb = macsec_encrypt(skb, dev); |
| 2685 | if (IS_ERR(skb)) { |
| 2686 | if (PTR_ERR(skb) != -EINPROGRESS) |
| 2687 | dev->stats.tx_dropped++; |
| 2688 | return NETDEV_TX_OK; |
| 2689 | } |
| 2690 | |
| 2691 | macsec_count_tx(skb, &macsec->secy.tx_sc, macsec_skb_cb(skb)->tx_sa); |
| 2692 | |
| 2693 | macsec_encrypt_finish(skb, dev); |
| 2694 | len = skb->len; |
| 2695 | ret = dev_queue_xmit(skb); |
| 2696 | count_tx(dev, ret, len); |
| 2697 | return ret; |
| 2698 | } |
| 2699 | |
| 2700 | #define MACSEC_FEATURES \ |
| 2701 | (NETIF_F_SG | NETIF_F_HIGHDMA | NETIF_F_FRAGLIST) |
| 2702 | static int macsec_dev_init(struct net_device *dev) |
| 2703 | { |
| 2704 | struct macsec_dev *macsec = macsec_priv(dev); |
| 2705 | struct net_device *real_dev = macsec->real_dev; |
Paolo Abeni | 5491e7c | 2016-07-20 18:11:32 +0200 | [diff] [blame] | 2706 | int err; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2707 | |
| 2708 | dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
| 2709 | if (!dev->tstats) |
| 2710 | return -ENOMEM; |
| 2711 | |
Paolo Abeni | 5491e7c | 2016-07-20 18:11:32 +0200 | [diff] [blame] | 2712 | err = gro_cells_init(&macsec->gro_cells, dev); |
| 2713 | if (err) { |
| 2714 | free_percpu(dev->tstats); |
| 2715 | return err; |
| 2716 | } |
| 2717 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2718 | dev->features = real_dev->features & MACSEC_FEATURES; |
| 2719 | dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE; |
| 2720 | |
| 2721 | dev->needed_headroom = real_dev->needed_headroom + |
| 2722 | MACSEC_NEEDED_HEADROOM; |
| 2723 | dev->needed_tailroom = real_dev->needed_tailroom + |
| 2724 | MACSEC_NEEDED_TAILROOM; |
| 2725 | |
| 2726 | if (is_zero_ether_addr(dev->dev_addr)) |
| 2727 | eth_hw_addr_inherit(dev, real_dev); |
| 2728 | if (is_zero_ether_addr(dev->broadcast)) |
| 2729 | memcpy(dev->broadcast, real_dev->broadcast, dev->addr_len); |
| 2730 | |
| 2731 | return 0; |
| 2732 | } |
| 2733 | |
| 2734 | static void macsec_dev_uninit(struct net_device *dev) |
| 2735 | { |
Paolo Abeni | 5491e7c | 2016-07-20 18:11:32 +0200 | [diff] [blame] | 2736 | struct macsec_dev *macsec = macsec_priv(dev); |
| 2737 | |
| 2738 | gro_cells_destroy(&macsec->gro_cells); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2739 | free_percpu(dev->tstats); |
| 2740 | } |
| 2741 | |
| 2742 | static netdev_features_t macsec_fix_features(struct net_device *dev, |
| 2743 | netdev_features_t features) |
| 2744 | { |
| 2745 | struct macsec_dev *macsec = macsec_priv(dev); |
| 2746 | struct net_device *real_dev = macsec->real_dev; |
| 2747 | |
Paolo Abeni | 5491e7c | 2016-07-20 18:11:32 +0200 | [diff] [blame] | 2748 | features &= (real_dev->features & MACSEC_FEATURES) | |
| 2749 | NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES; |
| 2750 | features |= NETIF_F_LLTX; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2751 | |
| 2752 | return features; |
| 2753 | } |
| 2754 | |
| 2755 | static int macsec_dev_open(struct net_device *dev) |
| 2756 | { |
| 2757 | struct macsec_dev *macsec = macsec_priv(dev); |
| 2758 | struct net_device *real_dev = macsec->real_dev; |
| 2759 | int err; |
| 2760 | |
| 2761 | if (!(real_dev->flags & IFF_UP)) |
| 2762 | return -ENETDOWN; |
| 2763 | |
| 2764 | err = dev_uc_add(real_dev, dev->dev_addr); |
| 2765 | if (err < 0) |
| 2766 | return err; |
| 2767 | |
| 2768 | if (dev->flags & IFF_ALLMULTI) { |
| 2769 | err = dev_set_allmulti(real_dev, 1); |
| 2770 | if (err < 0) |
| 2771 | goto del_unicast; |
| 2772 | } |
| 2773 | |
| 2774 | if (dev->flags & IFF_PROMISC) { |
| 2775 | err = dev_set_promiscuity(real_dev, 1); |
| 2776 | if (err < 0) |
| 2777 | goto clear_allmulti; |
| 2778 | } |
| 2779 | |
| 2780 | if (netif_carrier_ok(real_dev)) |
| 2781 | netif_carrier_on(dev); |
| 2782 | |
| 2783 | return 0; |
| 2784 | clear_allmulti: |
| 2785 | if (dev->flags & IFF_ALLMULTI) |
| 2786 | dev_set_allmulti(real_dev, -1); |
| 2787 | del_unicast: |
| 2788 | dev_uc_del(real_dev, dev->dev_addr); |
| 2789 | netif_carrier_off(dev); |
| 2790 | return err; |
| 2791 | } |
| 2792 | |
| 2793 | static int macsec_dev_stop(struct net_device *dev) |
| 2794 | { |
| 2795 | struct macsec_dev *macsec = macsec_priv(dev); |
| 2796 | struct net_device *real_dev = macsec->real_dev; |
| 2797 | |
| 2798 | netif_carrier_off(dev); |
| 2799 | |
| 2800 | dev_mc_unsync(real_dev, dev); |
| 2801 | dev_uc_unsync(real_dev, dev); |
| 2802 | |
| 2803 | if (dev->flags & IFF_ALLMULTI) |
| 2804 | dev_set_allmulti(real_dev, -1); |
| 2805 | |
| 2806 | if (dev->flags & IFF_PROMISC) |
| 2807 | dev_set_promiscuity(real_dev, -1); |
| 2808 | |
| 2809 | dev_uc_del(real_dev, dev->dev_addr); |
| 2810 | |
| 2811 | return 0; |
| 2812 | } |
| 2813 | |
| 2814 | static void macsec_dev_change_rx_flags(struct net_device *dev, int change) |
| 2815 | { |
| 2816 | struct net_device *real_dev = macsec_priv(dev)->real_dev; |
| 2817 | |
| 2818 | if (!(dev->flags & IFF_UP)) |
| 2819 | return; |
| 2820 | |
| 2821 | if (change & IFF_ALLMULTI) |
| 2822 | dev_set_allmulti(real_dev, dev->flags & IFF_ALLMULTI ? 1 : -1); |
| 2823 | |
| 2824 | if (change & IFF_PROMISC) |
| 2825 | dev_set_promiscuity(real_dev, |
| 2826 | dev->flags & IFF_PROMISC ? 1 : -1); |
| 2827 | } |
| 2828 | |
| 2829 | static void macsec_dev_set_rx_mode(struct net_device *dev) |
| 2830 | { |
| 2831 | struct net_device *real_dev = macsec_priv(dev)->real_dev; |
| 2832 | |
| 2833 | dev_mc_sync(real_dev, dev); |
| 2834 | dev_uc_sync(real_dev, dev); |
| 2835 | } |
| 2836 | |
| 2837 | static int macsec_set_mac_address(struct net_device *dev, void *p) |
| 2838 | { |
| 2839 | struct macsec_dev *macsec = macsec_priv(dev); |
| 2840 | struct net_device *real_dev = macsec->real_dev; |
| 2841 | struct sockaddr *addr = p; |
| 2842 | int err; |
| 2843 | |
| 2844 | if (!is_valid_ether_addr(addr->sa_data)) |
| 2845 | return -EADDRNOTAVAIL; |
| 2846 | |
| 2847 | if (!(dev->flags & IFF_UP)) |
| 2848 | goto out; |
| 2849 | |
| 2850 | err = dev_uc_add(real_dev, addr->sa_data); |
| 2851 | if (err < 0) |
| 2852 | return err; |
| 2853 | |
| 2854 | dev_uc_del(real_dev, dev->dev_addr); |
| 2855 | |
| 2856 | out: |
| 2857 | ether_addr_copy(dev->dev_addr, addr->sa_data); |
| 2858 | return 0; |
| 2859 | } |
| 2860 | |
| 2861 | static int macsec_change_mtu(struct net_device *dev, int new_mtu) |
| 2862 | { |
| 2863 | struct macsec_dev *macsec = macsec_priv(dev); |
| 2864 | unsigned int extra = macsec->secy.icv_len + macsec_extra_len(true); |
| 2865 | |
| 2866 | if (macsec->real_dev->mtu - extra < new_mtu) |
| 2867 | return -ERANGE; |
| 2868 | |
| 2869 | dev->mtu = new_mtu; |
| 2870 | |
| 2871 | return 0; |
| 2872 | } |
| 2873 | |
| 2874 | static struct rtnl_link_stats64 *macsec_get_stats64(struct net_device *dev, |
| 2875 | struct rtnl_link_stats64 *s) |
| 2876 | { |
| 2877 | int cpu; |
| 2878 | |
| 2879 | if (!dev->tstats) |
| 2880 | return s; |
| 2881 | |
| 2882 | for_each_possible_cpu(cpu) { |
| 2883 | struct pcpu_sw_netstats *stats; |
| 2884 | struct pcpu_sw_netstats tmp; |
| 2885 | int start; |
| 2886 | |
| 2887 | stats = per_cpu_ptr(dev->tstats, cpu); |
| 2888 | do { |
| 2889 | start = u64_stats_fetch_begin_irq(&stats->syncp); |
| 2890 | tmp.rx_packets = stats->rx_packets; |
| 2891 | tmp.rx_bytes = stats->rx_bytes; |
| 2892 | tmp.tx_packets = stats->tx_packets; |
| 2893 | tmp.tx_bytes = stats->tx_bytes; |
| 2894 | } while (u64_stats_fetch_retry_irq(&stats->syncp, start)); |
| 2895 | |
| 2896 | s->rx_packets += tmp.rx_packets; |
| 2897 | s->rx_bytes += tmp.rx_bytes; |
| 2898 | s->tx_packets += tmp.tx_packets; |
| 2899 | s->tx_bytes += tmp.tx_bytes; |
| 2900 | } |
| 2901 | |
| 2902 | s->rx_dropped = dev->stats.rx_dropped; |
| 2903 | s->tx_dropped = dev->stats.tx_dropped; |
| 2904 | |
| 2905 | return s; |
| 2906 | } |
| 2907 | |
| 2908 | static int macsec_get_iflink(const struct net_device *dev) |
| 2909 | { |
| 2910 | return macsec_priv(dev)->real_dev->ifindex; |
| 2911 | } |
| 2912 | |
| 2913 | static const struct net_device_ops macsec_netdev_ops = { |
| 2914 | .ndo_init = macsec_dev_init, |
| 2915 | .ndo_uninit = macsec_dev_uninit, |
| 2916 | .ndo_open = macsec_dev_open, |
| 2917 | .ndo_stop = macsec_dev_stop, |
| 2918 | .ndo_fix_features = macsec_fix_features, |
| 2919 | .ndo_change_mtu = macsec_change_mtu, |
| 2920 | .ndo_set_rx_mode = macsec_dev_set_rx_mode, |
| 2921 | .ndo_change_rx_flags = macsec_dev_change_rx_flags, |
| 2922 | .ndo_set_mac_address = macsec_set_mac_address, |
| 2923 | .ndo_start_xmit = macsec_start_xmit, |
| 2924 | .ndo_get_stats64 = macsec_get_stats64, |
| 2925 | .ndo_get_iflink = macsec_get_iflink, |
| 2926 | }; |
| 2927 | |
| 2928 | static const struct device_type macsec_type = { |
| 2929 | .name = "macsec", |
| 2930 | }; |
| 2931 | |
| 2932 | static const struct nla_policy macsec_rtnl_policy[IFLA_MACSEC_MAX + 1] = { |
| 2933 | [IFLA_MACSEC_SCI] = { .type = NLA_U64 }, |
| 2934 | [IFLA_MACSEC_ICV_LEN] = { .type = NLA_U8 }, |
| 2935 | [IFLA_MACSEC_CIPHER_SUITE] = { .type = NLA_U64 }, |
| 2936 | [IFLA_MACSEC_WINDOW] = { .type = NLA_U32 }, |
| 2937 | [IFLA_MACSEC_ENCODING_SA] = { .type = NLA_U8 }, |
| 2938 | [IFLA_MACSEC_ENCRYPT] = { .type = NLA_U8 }, |
| 2939 | [IFLA_MACSEC_PROTECT] = { .type = NLA_U8 }, |
| 2940 | [IFLA_MACSEC_INC_SCI] = { .type = NLA_U8 }, |
| 2941 | [IFLA_MACSEC_ES] = { .type = NLA_U8 }, |
| 2942 | [IFLA_MACSEC_SCB] = { .type = NLA_U8 }, |
| 2943 | [IFLA_MACSEC_REPLAY_PROTECT] = { .type = NLA_U8 }, |
| 2944 | [IFLA_MACSEC_VALIDATION] = { .type = NLA_U8 }, |
| 2945 | }; |
| 2946 | |
| 2947 | static void macsec_free_netdev(struct net_device *dev) |
| 2948 | { |
| 2949 | struct macsec_dev *macsec = macsec_priv(dev); |
| 2950 | struct net_device *real_dev = macsec->real_dev; |
| 2951 | |
| 2952 | free_percpu(macsec->stats); |
| 2953 | free_percpu(macsec->secy.tx_sc.stats); |
| 2954 | |
| 2955 | dev_put(real_dev); |
| 2956 | free_netdev(dev); |
| 2957 | } |
| 2958 | |
| 2959 | static void macsec_setup(struct net_device *dev) |
| 2960 | { |
| 2961 | ether_setup(dev); |
Phil Sutter | e425974 | 2016-04-22 14:02:42 +0200 | [diff] [blame] | 2962 | dev->priv_flags |= IFF_NO_QUEUE; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 2963 | dev->netdev_ops = &macsec_netdev_ops; |
| 2964 | dev->destructor = macsec_free_netdev; |
| 2965 | |
| 2966 | eth_zero_addr(dev->broadcast); |
| 2967 | } |
| 2968 | |
| 2969 | static void macsec_changelink_common(struct net_device *dev, |
| 2970 | struct nlattr *data[]) |
| 2971 | { |
| 2972 | struct macsec_secy *secy; |
| 2973 | struct macsec_tx_sc *tx_sc; |
| 2974 | |
| 2975 | secy = &macsec_priv(dev)->secy; |
| 2976 | tx_sc = &secy->tx_sc; |
| 2977 | |
| 2978 | if (data[IFLA_MACSEC_ENCODING_SA]) { |
| 2979 | struct macsec_tx_sa *tx_sa; |
| 2980 | |
| 2981 | tx_sc->encoding_sa = nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]); |
| 2982 | tx_sa = rtnl_dereference(tx_sc->sa[tx_sc->encoding_sa]); |
| 2983 | |
| 2984 | secy->operational = tx_sa && tx_sa->active; |
| 2985 | } |
| 2986 | |
| 2987 | if (data[IFLA_MACSEC_WINDOW]) |
| 2988 | secy->replay_window = nla_get_u32(data[IFLA_MACSEC_WINDOW]); |
| 2989 | |
| 2990 | if (data[IFLA_MACSEC_ENCRYPT]) |
| 2991 | tx_sc->encrypt = !!nla_get_u8(data[IFLA_MACSEC_ENCRYPT]); |
| 2992 | |
| 2993 | if (data[IFLA_MACSEC_PROTECT]) |
| 2994 | secy->protect_frames = !!nla_get_u8(data[IFLA_MACSEC_PROTECT]); |
| 2995 | |
| 2996 | if (data[IFLA_MACSEC_INC_SCI]) |
| 2997 | tx_sc->send_sci = !!nla_get_u8(data[IFLA_MACSEC_INC_SCI]); |
| 2998 | |
| 2999 | if (data[IFLA_MACSEC_ES]) |
| 3000 | tx_sc->end_station = !!nla_get_u8(data[IFLA_MACSEC_ES]); |
| 3001 | |
| 3002 | if (data[IFLA_MACSEC_SCB]) |
| 3003 | tx_sc->scb = !!nla_get_u8(data[IFLA_MACSEC_SCB]); |
| 3004 | |
| 3005 | if (data[IFLA_MACSEC_REPLAY_PROTECT]) |
| 3006 | secy->replay_protect = !!nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT]); |
| 3007 | |
| 3008 | if (data[IFLA_MACSEC_VALIDATION]) |
| 3009 | secy->validate_frames = nla_get_u8(data[IFLA_MACSEC_VALIDATION]); |
| 3010 | } |
| 3011 | |
| 3012 | static int macsec_changelink(struct net_device *dev, struct nlattr *tb[], |
| 3013 | struct nlattr *data[]) |
| 3014 | { |
| 3015 | if (!data) |
| 3016 | return 0; |
| 3017 | |
| 3018 | if (data[IFLA_MACSEC_CIPHER_SUITE] || |
| 3019 | data[IFLA_MACSEC_ICV_LEN] || |
| 3020 | data[IFLA_MACSEC_SCI] || |
| 3021 | data[IFLA_MACSEC_PORT]) |
| 3022 | return -EINVAL; |
| 3023 | |
| 3024 | macsec_changelink_common(dev, data); |
| 3025 | |
| 3026 | return 0; |
| 3027 | } |
| 3028 | |
| 3029 | static void macsec_del_dev(struct macsec_dev *macsec) |
| 3030 | { |
| 3031 | int i; |
| 3032 | |
| 3033 | while (macsec->secy.rx_sc) { |
| 3034 | struct macsec_rx_sc *rx_sc = rtnl_dereference(macsec->secy.rx_sc); |
| 3035 | |
| 3036 | rcu_assign_pointer(macsec->secy.rx_sc, rx_sc->next); |
| 3037 | free_rx_sc(rx_sc); |
| 3038 | } |
| 3039 | |
| 3040 | for (i = 0; i < MACSEC_NUM_AN; i++) { |
| 3041 | struct macsec_tx_sa *sa = rtnl_dereference(macsec->secy.tx_sc.sa[i]); |
| 3042 | |
| 3043 | if (sa) { |
| 3044 | RCU_INIT_POINTER(macsec->secy.tx_sc.sa[i], NULL); |
| 3045 | clear_tx_sa(sa); |
| 3046 | } |
| 3047 | } |
| 3048 | } |
| 3049 | |
| 3050 | static void macsec_dellink(struct net_device *dev, struct list_head *head) |
| 3051 | { |
| 3052 | struct macsec_dev *macsec = macsec_priv(dev); |
| 3053 | struct net_device *real_dev = macsec->real_dev; |
| 3054 | struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); |
| 3055 | |
Sabrina Dubroca | 96cfc50 | 2016-04-22 11:28:05 +0200 | [diff] [blame] | 3056 | macsec_generation++; |
| 3057 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3058 | unregister_netdevice_queue(dev, head); |
| 3059 | list_del_rcu(&macsec->secys); |
Sabrina Dubroca | 960d584 | 2016-04-22 11:28:06 +0200 | [diff] [blame] | 3060 | if (list_empty(&rxd->secys)) { |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3061 | netdev_rx_handler_unregister(real_dev); |
Sabrina Dubroca | 960d584 | 2016-04-22 11:28:06 +0200 | [diff] [blame] | 3062 | kfree(rxd); |
| 3063 | } |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3064 | |
| 3065 | macsec_del_dev(macsec); |
| 3066 | } |
| 3067 | |
| 3068 | static int register_macsec_dev(struct net_device *real_dev, |
| 3069 | struct net_device *dev) |
| 3070 | { |
| 3071 | struct macsec_dev *macsec = macsec_priv(dev); |
| 3072 | struct macsec_rxh_data *rxd = macsec_data_rtnl(real_dev); |
| 3073 | |
| 3074 | if (!rxd) { |
| 3075 | int err; |
| 3076 | |
| 3077 | rxd = kmalloc(sizeof(*rxd), GFP_KERNEL); |
| 3078 | if (!rxd) |
| 3079 | return -ENOMEM; |
| 3080 | |
| 3081 | INIT_LIST_HEAD(&rxd->secys); |
| 3082 | |
| 3083 | err = netdev_rx_handler_register(real_dev, macsec_handle_frame, |
| 3084 | rxd); |
Sabrina Dubroca | 960d584 | 2016-04-22 11:28:06 +0200 | [diff] [blame] | 3085 | if (err < 0) { |
| 3086 | kfree(rxd); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3087 | return err; |
Sabrina Dubroca | 960d584 | 2016-04-22 11:28:06 +0200 | [diff] [blame] | 3088 | } |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3089 | } |
| 3090 | |
| 3091 | list_add_tail_rcu(&macsec->secys, &rxd->secys); |
| 3092 | return 0; |
| 3093 | } |
| 3094 | |
| 3095 | static bool sci_exists(struct net_device *dev, sci_t sci) |
| 3096 | { |
| 3097 | struct macsec_rxh_data *rxd = macsec_data_rtnl(dev); |
| 3098 | struct macsec_dev *macsec; |
| 3099 | |
| 3100 | list_for_each_entry(macsec, &rxd->secys, secys) { |
| 3101 | if (macsec->secy.sci == sci) |
| 3102 | return true; |
| 3103 | } |
| 3104 | |
| 3105 | return false; |
| 3106 | } |
| 3107 | |
| 3108 | static sci_t dev_to_sci(struct net_device *dev, __be16 port) |
| 3109 | { |
| 3110 | return make_sci(dev->dev_addr, port); |
| 3111 | } |
| 3112 | |
| 3113 | static int macsec_add_dev(struct net_device *dev, sci_t sci, u8 icv_len) |
| 3114 | { |
| 3115 | struct macsec_dev *macsec = macsec_priv(dev); |
| 3116 | struct macsec_secy *secy = &macsec->secy; |
| 3117 | |
| 3118 | macsec->stats = netdev_alloc_pcpu_stats(struct pcpu_secy_stats); |
| 3119 | if (!macsec->stats) |
| 3120 | return -ENOMEM; |
| 3121 | |
| 3122 | secy->tx_sc.stats = netdev_alloc_pcpu_stats(struct pcpu_tx_sc_stats); |
| 3123 | if (!secy->tx_sc.stats) { |
| 3124 | free_percpu(macsec->stats); |
| 3125 | return -ENOMEM; |
| 3126 | } |
| 3127 | |
| 3128 | if (sci == MACSEC_UNDEF_SCI) |
| 3129 | sci = dev_to_sci(dev, MACSEC_PORT_ES); |
| 3130 | |
| 3131 | secy->netdev = dev; |
| 3132 | secy->operational = true; |
| 3133 | secy->key_len = DEFAULT_SAK_LEN; |
| 3134 | secy->icv_len = icv_len; |
| 3135 | secy->validate_frames = MACSEC_VALIDATE_DEFAULT; |
| 3136 | secy->protect_frames = true; |
| 3137 | secy->replay_protect = false; |
| 3138 | |
| 3139 | secy->sci = sci; |
| 3140 | secy->tx_sc.active = true; |
| 3141 | secy->tx_sc.encoding_sa = DEFAULT_ENCODING_SA; |
| 3142 | secy->tx_sc.encrypt = DEFAULT_ENCRYPT; |
| 3143 | secy->tx_sc.send_sci = DEFAULT_SEND_SCI; |
| 3144 | secy->tx_sc.end_station = false; |
| 3145 | secy->tx_sc.scb = false; |
| 3146 | |
| 3147 | return 0; |
| 3148 | } |
| 3149 | |
| 3150 | static int macsec_newlink(struct net *net, struct net_device *dev, |
| 3151 | struct nlattr *tb[], struct nlattr *data[]) |
| 3152 | { |
| 3153 | struct macsec_dev *macsec = macsec_priv(dev); |
| 3154 | struct net_device *real_dev; |
| 3155 | int err; |
| 3156 | sci_t sci; |
| 3157 | u8 icv_len = DEFAULT_ICV_LEN; |
| 3158 | rx_handler_func_t *rx_handler; |
| 3159 | |
| 3160 | if (!tb[IFLA_LINK]) |
| 3161 | return -EINVAL; |
| 3162 | real_dev = __dev_get_by_index(net, nla_get_u32(tb[IFLA_LINK])); |
| 3163 | if (!real_dev) |
| 3164 | return -ENODEV; |
| 3165 | |
| 3166 | dev->priv_flags |= IFF_MACSEC; |
| 3167 | |
| 3168 | macsec->real_dev = real_dev; |
| 3169 | |
| 3170 | if (data && data[IFLA_MACSEC_ICV_LEN]) |
| 3171 | icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); |
| 3172 | dev->mtu = real_dev->mtu - icv_len - macsec_extra_len(true); |
| 3173 | |
| 3174 | rx_handler = rtnl_dereference(real_dev->rx_handler); |
| 3175 | if (rx_handler && rx_handler != macsec_handle_frame) |
| 3176 | return -EBUSY; |
| 3177 | |
| 3178 | err = register_netdevice(dev); |
| 3179 | if (err < 0) |
| 3180 | return err; |
| 3181 | |
Sabrina Dubroca | 0759e55 | 2016-07-29 15:37:55 +0200 | [diff] [blame] | 3182 | dev_hold(real_dev); |
| 3183 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3184 | /* need to be already registered so that ->init has run and |
| 3185 | * the MAC addr is set |
| 3186 | */ |
| 3187 | if (data && data[IFLA_MACSEC_SCI]) |
| 3188 | sci = nla_get_sci(data[IFLA_MACSEC_SCI]); |
| 3189 | else if (data && data[IFLA_MACSEC_PORT]) |
| 3190 | sci = dev_to_sci(dev, nla_get_be16(data[IFLA_MACSEC_PORT])); |
| 3191 | else |
| 3192 | sci = dev_to_sci(dev, MACSEC_PORT_ES); |
| 3193 | |
| 3194 | if (rx_handler && sci_exists(real_dev, sci)) { |
| 3195 | err = -EBUSY; |
| 3196 | goto unregister; |
| 3197 | } |
| 3198 | |
| 3199 | err = macsec_add_dev(dev, sci, icv_len); |
| 3200 | if (err) |
| 3201 | goto unregister; |
| 3202 | |
| 3203 | if (data) |
| 3204 | macsec_changelink_common(dev, data); |
| 3205 | |
| 3206 | err = register_macsec_dev(real_dev, dev); |
| 3207 | if (err < 0) |
| 3208 | goto del_dev; |
| 3209 | |
Sabrina Dubroca | 96cfc50 | 2016-04-22 11:28:05 +0200 | [diff] [blame] | 3210 | macsec_generation++; |
| 3211 | |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3212 | return 0; |
| 3213 | |
| 3214 | del_dev: |
| 3215 | macsec_del_dev(macsec); |
| 3216 | unregister: |
| 3217 | unregister_netdevice(dev); |
| 3218 | return err; |
| 3219 | } |
| 3220 | |
| 3221 | static int macsec_validate_attr(struct nlattr *tb[], struct nlattr *data[]) |
| 3222 | { |
Sabrina Dubroca | 7481648 | 2016-04-22 11:28:08 +0200 | [diff] [blame] | 3223 | u64 csid = MACSEC_DEFAULT_CIPHER_ID; |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3224 | u8 icv_len = DEFAULT_ICV_LEN; |
| 3225 | int flag; |
| 3226 | bool es, scb, sci; |
| 3227 | |
| 3228 | if (!data) |
| 3229 | return 0; |
| 3230 | |
| 3231 | if (data[IFLA_MACSEC_CIPHER_SUITE]) |
| 3232 | csid = nla_get_u64(data[IFLA_MACSEC_CIPHER_SUITE]); |
| 3233 | |
Davide Caratti | f04c392 | 2016-07-22 15:07:58 +0200 | [diff] [blame] | 3234 | if (data[IFLA_MACSEC_ICV_LEN]) { |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3235 | icv_len = nla_get_u8(data[IFLA_MACSEC_ICV_LEN]); |
Davide Caratti | f04c392 | 2016-07-22 15:07:58 +0200 | [diff] [blame] | 3236 | if (icv_len != DEFAULT_ICV_LEN) { |
| 3237 | char dummy_key[DEFAULT_SAK_LEN] = { 0 }; |
| 3238 | struct crypto_aead *dummy_tfm; |
| 3239 | |
| 3240 | dummy_tfm = macsec_alloc_tfm(dummy_key, |
| 3241 | DEFAULT_SAK_LEN, |
| 3242 | icv_len); |
| 3243 | if (IS_ERR(dummy_tfm)) |
| 3244 | return PTR_ERR(dummy_tfm); |
| 3245 | crypto_free_aead(dummy_tfm); |
| 3246 | } |
| 3247 | } |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3248 | |
| 3249 | switch (csid) { |
Sabrina Dubroca | 7481648 | 2016-04-22 11:28:08 +0200 | [diff] [blame] | 3250 | case MACSEC_DEFAULT_CIPHER_ID: |
| 3251 | case MACSEC_DEFAULT_CIPHER_ALT: |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3252 | if (icv_len < MACSEC_MIN_ICV_LEN || |
Davide Caratti | 2ccbe2c | 2016-07-22 15:07:56 +0200 | [diff] [blame] | 3253 | icv_len > MACSEC_STD_ICV_LEN) |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3254 | return -EINVAL; |
| 3255 | break; |
| 3256 | default: |
| 3257 | return -EINVAL; |
| 3258 | } |
| 3259 | |
| 3260 | if (data[IFLA_MACSEC_ENCODING_SA]) { |
| 3261 | if (nla_get_u8(data[IFLA_MACSEC_ENCODING_SA]) >= MACSEC_NUM_AN) |
| 3262 | return -EINVAL; |
| 3263 | } |
| 3264 | |
| 3265 | for (flag = IFLA_MACSEC_ENCODING_SA + 1; |
| 3266 | flag < IFLA_MACSEC_VALIDATION; |
| 3267 | flag++) { |
| 3268 | if (data[flag]) { |
| 3269 | if (nla_get_u8(data[flag]) > 1) |
| 3270 | return -EINVAL; |
| 3271 | } |
| 3272 | } |
| 3273 | |
| 3274 | es = data[IFLA_MACSEC_ES] ? nla_get_u8(data[IFLA_MACSEC_ES]) : false; |
| 3275 | sci = data[IFLA_MACSEC_INC_SCI] ? nla_get_u8(data[IFLA_MACSEC_INC_SCI]) : false; |
| 3276 | scb = data[IFLA_MACSEC_SCB] ? nla_get_u8(data[IFLA_MACSEC_SCB]) : false; |
| 3277 | |
| 3278 | if ((sci && (scb || es)) || (scb && es)) |
| 3279 | return -EINVAL; |
| 3280 | |
| 3281 | if (data[IFLA_MACSEC_VALIDATION] && |
| 3282 | nla_get_u8(data[IFLA_MACSEC_VALIDATION]) > MACSEC_VALIDATE_MAX) |
| 3283 | return -EINVAL; |
| 3284 | |
Sabrina Dubroca | 4b1fb93 | 2016-04-22 11:28:09 +0200 | [diff] [blame] | 3285 | if ((data[IFLA_MACSEC_REPLAY_PROTECT] && |
| 3286 | nla_get_u8(data[IFLA_MACSEC_REPLAY_PROTECT])) && |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3287 | !data[IFLA_MACSEC_WINDOW]) |
| 3288 | return -EINVAL; |
| 3289 | |
| 3290 | return 0; |
| 3291 | } |
| 3292 | |
| 3293 | static struct net *macsec_get_link_net(const struct net_device *dev) |
| 3294 | { |
| 3295 | return dev_net(macsec_priv(dev)->real_dev); |
| 3296 | } |
| 3297 | |
| 3298 | static size_t macsec_get_size(const struct net_device *dev) |
| 3299 | { |
| 3300 | return 0 + |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 3301 | nla_total_size_64bit(8) + /* SCI */ |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3302 | nla_total_size(1) + /* ICV_LEN */ |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 3303 | nla_total_size_64bit(8) + /* CIPHER_SUITE */ |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3304 | nla_total_size(4) + /* WINDOW */ |
| 3305 | nla_total_size(1) + /* ENCODING_SA */ |
| 3306 | nla_total_size(1) + /* ENCRYPT */ |
| 3307 | nla_total_size(1) + /* PROTECT */ |
| 3308 | nla_total_size(1) + /* INC_SCI */ |
| 3309 | nla_total_size(1) + /* ES */ |
| 3310 | nla_total_size(1) + /* SCB */ |
| 3311 | nla_total_size(1) + /* REPLAY_PROTECT */ |
| 3312 | nla_total_size(1) + /* VALIDATION */ |
| 3313 | 0; |
| 3314 | } |
| 3315 | |
| 3316 | static int macsec_fill_info(struct sk_buff *skb, |
| 3317 | const struct net_device *dev) |
| 3318 | { |
| 3319 | struct macsec_secy *secy = &macsec_priv(dev)->secy; |
| 3320 | struct macsec_tx_sc *tx_sc = &secy->tx_sc; |
| 3321 | |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 3322 | if (nla_put_sci(skb, IFLA_MACSEC_SCI, secy->sci, |
| 3323 | IFLA_MACSEC_PAD) || |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3324 | nla_put_u8(skb, IFLA_MACSEC_ICV_LEN, secy->icv_len) || |
Nicolas Dichtel | f60d94c | 2016-04-26 10:06:11 +0200 | [diff] [blame] | 3325 | nla_put_u64_64bit(skb, IFLA_MACSEC_CIPHER_SUITE, |
David S. Miller | c0cc531 | 2016-04-27 15:43:10 -0400 | [diff] [blame] | 3326 | MACSEC_DEFAULT_CIPHER_ID, IFLA_MACSEC_PAD) || |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3327 | nla_put_u8(skb, IFLA_MACSEC_ENCODING_SA, tx_sc->encoding_sa) || |
| 3328 | nla_put_u8(skb, IFLA_MACSEC_ENCRYPT, tx_sc->encrypt) || |
| 3329 | nla_put_u8(skb, IFLA_MACSEC_PROTECT, secy->protect_frames) || |
| 3330 | nla_put_u8(skb, IFLA_MACSEC_INC_SCI, tx_sc->send_sci) || |
| 3331 | nla_put_u8(skb, IFLA_MACSEC_ES, tx_sc->end_station) || |
| 3332 | nla_put_u8(skb, IFLA_MACSEC_SCB, tx_sc->scb) || |
| 3333 | nla_put_u8(skb, IFLA_MACSEC_REPLAY_PROTECT, secy->replay_protect) || |
| 3334 | nla_put_u8(skb, IFLA_MACSEC_VALIDATION, secy->validate_frames) || |
| 3335 | 0) |
| 3336 | goto nla_put_failure; |
| 3337 | |
| 3338 | if (secy->replay_protect) { |
| 3339 | if (nla_put_u32(skb, IFLA_MACSEC_WINDOW, secy->replay_window)) |
| 3340 | goto nla_put_failure; |
| 3341 | } |
| 3342 | |
| 3343 | return 0; |
| 3344 | |
| 3345 | nla_put_failure: |
| 3346 | return -EMSGSIZE; |
| 3347 | } |
| 3348 | |
| 3349 | static struct rtnl_link_ops macsec_link_ops __read_mostly = { |
| 3350 | .kind = "macsec", |
| 3351 | .priv_size = sizeof(struct macsec_dev), |
| 3352 | .maxtype = IFLA_MACSEC_MAX, |
| 3353 | .policy = macsec_rtnl_policy, |
| 3354 | .setup = macsec_setup, |
| 3355 | .validate = macsec_validate_attr, |
| 3356 | .newlink = macsec_newlink, |
| 3357 | .changelink = macsec_changelink, |
| 3358 | .dellink = macsec_dellink, |
| 3359 | .get_size = macsec_get_size, |
| 3360 | .fill_info = macsec_fill_info, |
| 3361 | .get_link_net = macsec_get_link_net, |
| 3362 | }; |
| 3363 | |
| 3364 | static bool is_macsec_master(struct net_device *dev) |
| 3365 | { |
| 3366 | return rcu_access_pointer(dev->rx_handler) == macsec_handle_frame; |
| 3367 | } |
| 3368 | |
| 3369 | static int macsec_notify(struct notifier_block *this, unsigned long event, |
| 3370 | void *ptr) |
| 3371 | { |
| 3372 | struct net_device *real_dev = netdev_notifier_info_to_dev(ptr); |
| 3373 | LIST_HEAD(head); |
| 3374 | |
| 3375 | if (!is_macsec_master(real_dev)) |
| 3376 | return NOTIFY_DONE; |
| 3377 | |
| 3378 | switch (event) { |
| 3379 | case NETDEV_UNREGISTER: { |
| 3380 | struct macsec_dev *m, *n; |
| 3381 | struct macsec_rxh_data *rxd; |
| 3382 | |
| 3383 | rxd = macsec_data_rtnl(real_dev); |
| 3384 | list_for_each_entry_safe(m, n, &rxd->secys, secys) { |
| 3385 | macsec_dellink(m->secy.netdev, &head); |
| 3386 | } |
| 3387 | unregister_netdevice_many(&head); |
| 3388 | break; |
| 3389 | } |
| 3390 | case NETDEV_CHANGEMTU: { |
| 3391 | struct macsec_dev *m; |
| 3392 | struct macsec_rxh_data *rxd; |
| 3393 | |
| 3394 | rxd = macsec_data_rtnl(real_dev); |
| 3395 | list_for_each_entry(m, &rxd->secys, secys) { |
| 3396 | struct net_device *dev = m->secy.netdev; |
| 3397 | unsigned int mtu = real_dev->mtu - (m->secy.icv_len + |
| 3398 | macsec_extra_len(true)); |
| 3399 | |
| 3400 | if (dev->mtu > mtu) |
| 3401 | dev_set_mtu(dev, mtu); |
| 3402 | } |
| 3403 | } |
| 3404 | } |
| 3405 | |
| 3406 | return NOTIFY_OK; |
| 3407 | } |
| 3408 | |
| 3409 | static struct notifier_block macsec_notifier = { |
| 3410 | .notifier_call = macsec_notify, |
| 3411 | }; |
| 3412 | |
| 3413 | static int __init macsec_init(void) |
| 3414 | { |
| 3415 | int err; |
| 3416 | |
| 3417 | pr_info("MACsec IEEE 802.1AE\n"); |
| 3418 | err = register_netdevice_notifier(&macsec_notifier); |
| 3419 | if (err) |
| 3420 | return err; |
| 3421 | |
| 3422 | err = rtnl_link_register(&macsec_link_ops); |
| 3423 | if (err) |
| 3424 | goto notifier; |
| 3425 | |
| 3426 | err = genl_register_family_with_ops(&macsec_fam, macsec_genl_ops); |
| 3427 | if (err) |
| 3428 | goto rtnl; |
| 3429 | |
| 3430 | return 0; |
| 3431 | |
| 3432 | rtnl: |
| 3433 | rtnl_link_unregister(&macsec_link_ops); |
| 3434 | notifier: |
| 3435 | unregister_netdevice_notifier(&macsec_notifier); |
| 3436 | return err; |
| 3437 | } |
| 3438 | |
| 3439 | static void __exit macsec_exit(void) |
| 3440 | { |
| 3441 | genl_unregister_family(&macsec_fam); |
| 3442 | rtnl_link_unregister(&macsec_link_ops); |
| 3443 | unregister_netdevice_notifier(&macsec_notifier); |
Sabrina Dubroca | b196c22a | 2016-06-14 15:25:14 +0200 | [diff] [blame] | 3444 | rcu_barrier(); |
Sabrina Dubroca | c09440f | 2016-03-11 18:07:33 +0100 | [diff] [blame] | 3445 | } |
| 3446 | |
| 3447 | module_init(macsec_init); |
| 3448 | module_exit(macsec_exit); |
| 3449 | |
| 3450 | MODULE_ALIAS_RTNL_LINK("macsec"); |
| 3451 | |
| 3452 | MODULE_DESCRIPTION("MACsec IEEE 802.1AE"); |
| 3453 | MODULE_LICENSE("GPL v2"); |