1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved. 4 */ 5 6 #include "netlink.h" 7 #include "device.h" 8 #include "peer.h" 9 #include "socket.h" 10 #include "queueing.h" 11 #include "messages.h" 12 13 #include <uapi/linux/wireguard.h> 14 15 #include <linux/if.h> 16 #include <net/genetlink.h> 17 #include <net/sock.h> 18 #include <crypto/algapi.h> 19 20 static struct genl_family genl_family; 21 22 static const struct nla_policy device_policy[WGDEVICE_A_MAX + 1] = { 23 [WGDEVICE_A_IFINDEX] = { .type = NLA_U32 }, 24 [WGDEVICE_A_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, 25 [WGDEVICE_A_PRIVATE_KEY] = { .type = NLA_EXACT_LEN, .len = NOISE_PUBLIC_KEY_LEN }, 26 [WGDEVICE_A_PUBLIC_KEY] = { .type = NLA_EXACT_LEN, .len = NOISE_PUBLIC_KEY_LEN }, 27 [WGDEVICE_A_FLAGS] = { .type = NLA_U32 }, 28 [WGDEVICE_A_LISTEN_PORT] = { .type = NLA_U16 }, 29 [WGDEVICE_A_FWMARK] = { .type = NLA_U32 }, 30 [WGDEVICE_A_PEERS] = { .type = NLA_NESTED } 31 }; 32 33 static const struct nla_policy peer_policy[WGPEER_A_MAX + 1] = { 34 [WGPEER_A_PUBLIC_KEY] = { .type = NLA_EXACT_LEN, .len = NOISE_PUBLIC_KEY_LEN }, 35 [WGPEER_A_PRESHARED_KEY] = { .type = NLA_EXACT_LEN, .len = NOISE_SYMMETRIC_KEY_LEN }, 36 [WGPEER_A_FLAGS] = { .type = NLA_U32 }, 37 [WGPEER_A_ENDPOINT] = { .type = NLA_MIN_LEN, .len = sizeof(struct sockaddr) }, 38 [WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL] = { .type = NLA_U16 }, 39 [WGPEER_A_LAST_HANDSHAKE_TIME] = { .type = NLA_EXACT_LEN, .len = sizeof(struct __kernel_timespec) }, 40 [WGPEER_A_RX_BYTES] = { .type = NLA_U64 }, 41 [WGPEER_A_TX_BYTES] = { .type = NLA_U64 }, 42 [WGPEER_A_ALLOWEDIPS] = { .type = NLA_NESTED }, 43 [WGPEER_A_PROTOCOL_VERSION] = { .type = NLA_U32 } 44 }; 45 46 static const struct nla_policy allowedip_policy[WGALLOWEDIP_A_MAX + 1] = { 47 [WGALLOWEDIP_A_FAMILY] = { .type = NLA_U16 }, 48 [WGALLOWEDIP_A_IPADDR] = { .type = NLA_MIN_LEN, .len = sizeof(struct in_addr) }, 49 [WGALLOWEDIP_A_CIDR_MASK] = { .type = NLA_U8 } 50 }; 51 52 static struct wg_device *lookup_interface(struct nlattr **attrs, 53 struct sk_buff *skb) 54 { 55 struct net_device *dev = NULL; 56 57 if (!attrs[WGDEVICE_A_IFINDEX] == !attrs[WGDEVICE_A_IFNAME]) 58 return ERR_PTR(-EBADR); 59 if (attrs[WGDEVICE_A_IFINDEX]) 60 dev = dev_get_by_index(sock_net(skb->sk), 61 nla_get_u32(attrs[WGDEVICE_A_IFINDEX])); 62 else if (attrs[WGDEVICE_A_IFNAME]) 63 dev = dev_get_by_name(sock_net(skb->sk), 64 nla_data(attrs[WGDEVICE_A_IFNAME])); 65 if (!dev) 66 return ERR_PTR(-ENODEV); 67 if (!dev->rtnl_link_ops || !dev->rtnl_link_ops->kind || 68 strcmp(dev->rtnl_link_ops->kind, KBUILD_MODNAME)) { 69 dev_put(dev); 70 return ERR_PTR(-EOPNOTSUPP); 71 } 72 return netdev_priv(dev); 73 } 74 75 static int get_allowedips(struct sk_buff *skb, const u8 *ip, u8 cidr, 76 int family) 77 { 78 struct nlattr *allowedip_nest; 79 80 allowedip_nest = nla_nest_start(skb, 0); 81 if (!allowedip_nest) 82 return -EMSGSIZE; 83 84 if (nla_put_u8(skb, WGALLOWEDIP_A_CIDR_MASK, cidr) || 85 nla_put_u16(skb, WGALLOWEDIP_A_FAMILY, family) || 86 nla_put(skb, WGALLOWEDIP_A_IPADDR, family == AF_INET6 ? 87 sizeof(struct in6_addr) : sizeof(struct in_addr), ip)) { 88 nla_nest_cancel(skb, allowedip_nest); 89 return -EMSGSIZE; 90 } 91 92 nla_nest_end(skb, allowedip_nest); 93 return 0; 94 } 95 96 struct dump_ctx { 97 struct wg_device *wg; 98 struct wg_peer *next_peer; 99 u64 allowedips_seq; 100 struct allowedips_node *next_allowedip; 101 }; 102 103 #define DUMP_CTX(cb) ((struct dump_ctx *)(cb)->args) 104 105 static int 106 get_peer(struct wg_peer *peer, struct sk_buff *skb, struct dump_ctx *ctx) 107 { 108 109 struct nlattr *allowedips_nest, *peer_nest = nla_nest_start(skb, 0); 110 struct allowedips_node *allowedips_node = ctx->next_allowedip; 111 bool fail; 112 113 if (!peer_nest) 114 return -EMSGSIZE; 115 116 down_read(&peer->handshake.lock); 117 fail = nla_put(skb, WGPEER_A_PUBLIC_KEY, NOISE_PUBLIC_KEY_LEN, 118 peer->handshake.remote_static); 119 up_read(&peer->handshake.lock); 120 if (fail) 121 goto err; 122 123 if (!allowedips_node) { 124 const struct __kernel_timespec last_handshake = { 125 .tv_sec = peer->walltime_last_handshake.tv_sec, 126 .tv_nsec = peer->walltime_last_handshake.tv_nsec 127 }; 128 129 down_read(&peer->handshake.lock); 130 fail = nla_put(skb, WGPEER_A_PRESHARED_KEY, 131 NOISE_SYMMETRIC_KEY_LEN, 132 peer->handshake.preshared_key); 133 up_read(&peer->handshake.lock); 134 if (fail) 135 goto err; 136 137 if (nla_put(skb, WGPEER_A_LAST_HANDSHAKE_TIME, 138 sizeof(last_handshake), &last_handshake) || 139 nla_put_u16(skb, WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL, 140 peer->persistent_keepalive_interval) || 141 nla_put_u64_64bit(skb, WGPEER_A_TX_BYTES, peer->tx_bytes, 142 WGPEER_A_UNSPEC) || 143 nla_put_u64_64bit(skb, WGPEER_A_RX_BYTES, peer->rx_bytes, 144 WGPEER_A_UNSPEC) || 145 nla_put_u32(skb, WGPEER_A_PROTOCOL_VERSION, 1)) 146 goto err; 147 148 read_lock_bh(&peer->endpoint_lock); 149 if (peer->endpoint.addr.sa_family == AF_INET) 150 fail = nla_put(skb, WGPEER_A_ENDPOINT, 151 sizeof(peer->endpoint.addr4), 152 &peer->endpoint.addr4); 153 else if (peer->endpoint.addr.sa_family == AF_INET6) 154 fail = nla_put(skb, WGPEER_A_ENDPOINT, 155 sizeof(peer->endpoint.addr6), 156 &peer->endpoint.addr6); 157 read_unlock_bh(&peer->endpoint_lock); 158 if (fail) 159 goto err; 160 allowedips_node = 161 list_first_entry_or_null(&peer->allowedips_list, 162 struct allowedips_node, peer_list); 163 } 164 if (!allowedips_node) 165 goto no_allowedips; 166 if (!ctx->allowedips_seq) 167 ctx->allowedips_seq = peer->device->peer_allowedips.seq; 168 else if (ctx->allowedips_seq != peer->device->peer_allowedips.seq) 169 goto no_allowedips; 170 171 allowedips_nest = nla_nest_start(skb, WGPEER_A_ALLOWEDIPS); 172 if (!allowedips_nest) 173 goto err; 174 175 list_for_each_entry_from(allowedips_node, &peer->allowedips_list, 176 peer_list) { 177 u8 cidr, ip[16] __aligned(__alignof(u64)); 178 int family; 179 180 family = wg_allowedips_read_node(allowedips_node, ip, &cidr); 181 if (get_allowedips(skb, ip, cidr, family)) { 182 nla_nest_end(skb, allowedips_nest); 183 nla_nest_end(skb, peer_nest); 184 ctx->next_allowedip = allowedips_node; 185 return -EMSGSIZE; 186 } 187 } 188 nla_nest_end(skb, allowedips_nest); 189 no_allowedips: 190 nla_nest_end(skb, peer_nest); 191 ctx->next_allowedip = NULL; 192 ctx->allowedips_seq = 0; 193 return 0; 194 err: 195 nla_nest_cancel(skb, peer_nest); 196 return -EMSGSIZE; 197 } 198 199 static int wg_get_device_start(struct netlink_callback *cb) 200 { 201 struct wg_device *wg; 202 203 wg = lookup_interface(genl_dumpit_info(cb)->attrs, cb->skb); 204 if (IS_ERR(wg)) 205 return PTR_ERR(wg); 206 DUMP_CTX(cb)->wg = wg; 207 return 0; 208 } 209 210 static int wg_get_device_dump(struct sk_buff *skb, struct netlink_callback *cb) 211 { 212 struct wg_peer *peer, *next_peer_cursor; 213 struct dump_ctx *ctx = DUMP_CTX(cb); 214 struct wg_device *wg = ctx->wg; 215 struct nlattr *peers_nest; 216 int ret = -EMSGSIZE; 217 bool done = true; 218 void *hdr; 219 220 rtnl_lock(); 221 mutex_lock(&wg->device_update_lock); 222 cb->seq = wg->device_update_gen; 223 next_peer_cursor = ctx->next_peer; 224 225 hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, 226 &genl_family, NLM_F_MULTI, WG_CMD_GET_DEVICE); 227 if (!hdr) 228 goto out; 229 genl_dump_check_consistent(cb, hdr); 230 231 if (!ctx->next_peer) { 232 if (nla_put_u16(skb, WGDEVICE_A_LISTEN_PORT, 233 wg->incoming_port) || 234 nla_put_u32(skb, WGDEVICE_A_FWMARK, wg->fwmark) || 235 nla_put_u32(skb, WGDEVICE_A_IFINDEX, wg->dev->ifindex) || 236 nla_put_string(skb, WGDEVICE_A_IFNAME, wg->dev->name)) 237 goto out; 238 239 down_read(&wg->static_identity.lock); 240 if (wg->static_identity.has_identity) { 241 if (nla_put(skb, WGDEVICE_A_PRIVATE_KEY, 242 NOISE_PUBLIC_KEY_LEN, 243 wg->static_identity.static_private) || 244 nla_put(skb, WGDEVICE_A_PUBLIC_KEY, 245 NOISE_PUBLIC_KEY_LEN, 246 wg->static_identity.static_public)) { 247 up_read(&wg->static_identity.lock); 248 goto out; 249 } 250 } 251 up_read(&wg->static_identity.lock); 252 } 253 254 peers_nest = nla_nest_start(skb, WGDEVICE_A_PEERS); 255 if (!peers_nest) 256 goto out; 257 ret = 0; 258 /* If the last cursor was removed via list_del_init in peer_remove, then 259 * we just treat this the same as there being no more peers left. The 260 * reason is that seq_nr should indicate to userspace that this isn't a 261 * coherent dump anyway, so they'll try again. 262 */ 263 if (list_empty(&wg->peer_list) || 264 (ctx->next_peer && list_empty(&ctx->next_peer->peer_list))) { 265 nla_nest_cancel(skb, peers_nest); 266 goto out; 267 } 268 lockdep_assert_held(&wg->device_update_lock); 269 peer = list_prepare_entry(ctx->next_peer, &wg->peer_list, peer_list); 270 list_for_each_entry_continue(peer, &wg->peer_list, peer_list) { 271 if (get_peer(peer, skb, ctx)) { 272 done = false; 273 break; 274 } 275 next_peer_cursor = peer; 276 } 277 nla_nest_end(skb, peers_nest); 278 279 out: 280 if (!ret && !done && next_peer_cursor) 281 wg_peer_get(next_peer_cursor); 282 wg_peer_put(ctx->next_peer); 283 mutex_unlock(&wg->device_update_lock); 284 rtnl_unlock(); 285 286 if (ret) { 287 genlmsg_cancel(skb, hdr); 288 return ret; 289 } 290 genlmsg_end(skb, hdr); 291 if (done) { 292 ctx->next_peer = NULL; 293 return 0; 294 } 295 ctx->next_peer = next_peer_cursor; 296 return skb->len; 297 298 /* At this point, we can't really deal ourselves with safely zeroing out 299 * the private key material after usage. This will need an additional API 300 * in the kernel for marking skbs as zero_on_free. 301 */ 302 } 303 304 static int wg_get_device_done(struct netlink_callback *cb) 305 { 306 struct dump_ctx *ctx = DUMP_CTX(cb); 307 308 if (ctx->wg) 309 dev_put(ctx->wg->dev); 310 wg_peer_put(ctx->next_peer); 311 return 0; 312 } 313 314 static int set_port(struct wg_device *wg, u16 port) 315 { 316 struct wg_peer *peer; 317 318 if (wg->incoming_port == port) 319 return 0; 320 list_for_each_entry(peer, &wg->peer_list, peer_list) 321 wg_socket_clear_peer_endpoint_src(peer); 322 if (!netif_running(wg->dev)) { 323 wg->incoming_port = port; 324 return 0; 325 } 326 return wg_socket_init(wg, port); 327 } 328 329 static int set_allowedip(struct wg_peer *peer, struct nlattr **attrs) 330 { 331 int ret = -EINVAL; 332 u16 family; 333 u8 cidr; 334 335 if (!attrs[WGALLOWEDIP_A_FAMILY] || !attrs[WGALLOWEDIP_A_IPADDR] || 336 !attrs[WGALLOWEDIP_A_CIDR_MASK]) 337 return ret; 338 family = nla_get_u16(attrs[WGALLOWEDIP_A_FAMILY]); 339 cidr = nla_get_u8(attrs[WGALLOWEDIP_A_CIDR_MASK]); 340 341 if (family == AF_INET && cidr <= 32 && 342 nla_len(attrs[WGALLOWEDIP_A_IPADDR]) == sizeof(struct in_addr)) 343 ret = wg_allowedips_insert_v4( 344 &peer->device->peer_allowedips, 345 nla_data(attrs[WGALLOWEDIP_A_IPADDR]), cidr, peer, 346 &peer->device->device_update_lock); 347 else if (family == AF_INET6 && cidr <= 128 && 348 nla_len(attrs[WGALLOWEDIP_A_IPADDR]) == sizeof(struct in6_addr)) 349 ret = wg_allowedips_insert_v6( 350 &peer->device->peer_allowedips, 351 nla_data(attrs[WGALLOWEDIP_A_IPADDR]), cidr, peer, 352 &peer->device->device_update_lock); 353 354 return ret; 355 } 356 357 static int set_peer(struct wg_device *wg, struct nlattr **attrs) 358 { 359 u8 *public_key = NULL, *preshared_key = NULL; 360 struct wg_peer *peer = NULL; 361 u32 flags = 0; 362 int ret; 363 364 ret = -EINVAL; 365 if (attrs[WGPEER_A_PUBLIC_KEY] && 366 nla_len(attrs[WGPEER_A_PUBLIC_KEY]) == NOISE_PUBLIC_KEY_LEN) 367 public_key = nla_data(attrs[WGPEER_A_PUBLIC_KEY]); 368 else 369 goto out; 370 if (attrs[WGPEER_A_PRESHARED_KEY] && 371 nla_len(attrs[WGPEER_A_PRESHARED_KEY]) == NOISE_SYMMETRIC_KEY_LEN) 372 preshared_key = nla_data(attrs[WGPEER_A_PRESHARED_KEY]); 373 374 if (attrs[WGPEER_A_FLAGS]) 375 flags = nla_get_u32(attrs[WGPEER_A_FLAGS]); 376 ret = -EOPNOTSUPP; 377 if (flags & ~__WGPEER_F_ALL) 378 goto out; 379 380 ret = -EPFNOSUPPORT; 381 if (attrs[WGPEER_A_PROTOCOL_VERSION]) { 382 if (nla_get_u32(attrs[WGPEER_A_PROTOCOL_VERSION]) != 1) 383 goto out; 384 } 385 386 peer = wg_pubkey_hashtable_lookup(wg->peer_hashtable, 387 nla_data(attrs[WGPEER_A_PUBLIC_KEY])); 388 ret = 0; 389 if (!peer) { /* Peer doesn't exist yet. Add a new one. */ 390 if (flags & (WGPEER_F_REMOVE_ME | WGPEER_F_UPDATE_ONLY)) 391 goto out; 392 393 /* The peer is new, so there aren't allowed IPs to remove. */ 394 flags &= ~WGPEER_F_REPLACE_ALLOWEDIPS; 395 396 down_read(&wg->static_identity.lock); 397 if (wg->static_identity.has_identity && 398 !memcmp(nla_data(attrs[WGPEER_A_PUBLIC_KEY]), 399 wg->static_identity.static_public, 400 NOISE_PUBLIC_KEY_LEN)) { 401 /* We silently ignore peers that have the same public 402 * key as the device. The reason we do it silently is 403 * that we'd like for people to be able to reuse the 404 * same set of API calls across peers. 405 */ 406 up_read(&wg->static_identity.lock); 407 ret = 0; 408 goto out; 409 } 410 up_read(&wg->static_identity.lock); 411 412 peer = wg_peer_create(wg, public_key, preshared_key); 413 if (IS_ERR(peer)) { 414 /* Similar to the above, if the key is invalid, we skip 415 * it without fanfare, so that services don't need to 416 * worry about doing key validation themselves. 417 */ 418 ret = PTR_ERR(peer) == -EKEYREJECTED ? 0 : PTR_ERR(peer); 419 peer = NULL; 420 goto out; 421 } 422 /* Take additional reference, as though we've just been 423 * looked up. 424 */ 425 wg_peer_get(peer); 426 } 427 428 if (flags & WGPEER_F_REMOVE_ME) { 429 wg_peer_remove(peer); 430 goto out; 431 } 432 433 if (preshared_key) { 434 down_write(&peer->handshake.lock); 435 memcpy(&peer->handshake.preshared_key, preshared_key, 436 NOISE_SYMMETRIC_KEY_LEN); 437 up_write(&peer->handshake.lock); 438 } 439 440 if (attrs[WGPEER_A_ENDPOINT]) { 441 struct sockaddr *addr = nla_data(attrs[WGPEER_A_ENDPOINT]); 442 size_t len = nla_len(attrs[WGPEER_A_ENDPOINT]); 443 444 if ((len == sizeof(struct sockaddr_in) && 445 addr->sa_family == AF_INET) || 446 (len == sizeof(struct sockaddr_in6) && 447 addr->sa_family == AF_INET6)) { 448 struct endpoint endpoint = { { { 0 } } }; 449 450 memcpy(&endpoint.addr, addr, len); 451 wg_socket_set_peer_endpoint(peer, &endpoint); 452 } 453 } 454 455 if (flags & WGPEER_F_REPLACE_ALLOWEDIPS) 456 wg_allowedips_remove_by_peer(&wg->peer_allowedips, peer, 457 &wg->device_update_lock); 458 459 if (attrs[WGPEER_A_ALLOWEDIPS]) { 460 struct nlattr *attr, *allowedip[WGALLOWEDIP_A_MAX + 1]; 461 int rem; 462 463 nla_for_each_nested(attr, attrs[WGPEER_A_ALLOWEDIPS], rem) { 464 ret = nla_parse_nested(allowedip, WGALLOWEDIP_A_MAX, 465 attr, allowedip_policy, NULL); 466 if (ret < 0) 467 goto out; 468 ret = set_allowedip(peer, allowedip); 469 if (ret < 0) 470 goto out; 471 } 472 } 473 474 if (attrs[WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL]) { 475 const u16 persistent_keepalive_interval = nla_get_u16( 476 attrs[WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL]); 477 const bool send_keepalive = 478 !peer->persistent_keepalive_interval && 479 persistent_keepalive_interval && 480 netif_running(wg->dev); 481 482 peer->persistent_keepalive_interval = persistent_keepalive_interval; 483 if (send_keepalive) 484 wg_packet_send_keepalive(peer); 485 } 486 487 if (netif_running(wg->dev)) 488 wg_packet_send_staged_packets(peer); 489 490 out: 491 wg_peer_put(peer); 492 if (attrs[WGPEER_A_PRESHARED_KEY]) 493 memzero_explicit(nla_data(attrs[WGPEER_A_PRESHARED_KEY]), 494 nla_len(attrs[WGPEER_A_PRESHARED_KEY])); 495 return ret; 496 } 497 498 static int wg_set_device(struct sk_buff *skb, struct genl_info *info) 499 { 500 struct wg_device *wg = lookup_interface(info->attrs, skb); 501 u32 flags = 0; 502 int ret; 503 504 if (IS_ERR(wg)) { 505 ret = PTR_ERR(wg); 506 goto out_nodev; 507 } 508 509 rtnl_lock(); 510 mutex_lock(&wg->device_update_lock); 511 512 if (info->attrs[WGDEVICE_A_FLAGS]) 513 flags = nla_get_u32(info->attrs[WGDEVICE_A_FLAGS]); 514 ret = -EOPNOTSUPP; 515 if (flags & ~__WGDEVICE_F_ALL) 516 goto out; 517 518 ret = -EPERM; 519 if ((info->attrs[WGDEVICE_A_LISTEN_PORT] || 520 info->attrs[WGDEVICE_A_FWMARK]) && 521 !ns_capable(wg->creating_net->user_ns, CAP_NET_ADMIN)) 522 goto out; 523 524 ++wg->device_update_gen; 525 526 if (info->attrs[WGDEVICE_A_FWMARK]) { 527 struct wg_peer *peer; 528 529 wg->fwmark = nla_get_u32(info->attrs[WGDEVICE_A_FWMARK]); 530 list_for_each_entry(peer, &wg->peer_list, peer_list) 531 wg_socket_clear_peer_endpoint_src(peer); 532 } 533 534 if (info->attrs[WGDEVICE_A_LISTEN_PORT]) { 535 ret = set_port(wg, 536 nla_get_u16(info->attrs[WGDEVICE_A_LISTEN_PORT])); 537 if (ret) 538 goto out; 539 } 540 541 if (flags & WGDEVICE_F_REPLACE_PEERS) 542 wg_peer_remove_all(wg); 543 544 if (info->attrs[WGDEVICE_A_PRIVATE_KEY] && 545 nla_len(info->attrs[WGDEVICE_A_PRIVATE_KEY]) == 546 NOISE_PUBLIC_KEY_LEN) { 547 u8 *private_key = nla_data(info->attrs[WGDEVICE_A_PRIVATE_KEY]); 548 u8 public_key[NOISE_PUBLIC_KEY_LEN]; 549 struct wg_peer *peer, *temp; 550 551 if (!crypto_memneq(wg->static_identity.static_private, 552 private_key, NOISE_PUBLIC_KEY_LEN)) 553 goto skip_set_private_key; 554 555 /* We remove before setting, to prevent race, which means doing 556 * two 25519-genpub ops. 557 */ 558 if (curve25519_generate_public(public_key, private_key)) { 559 peer = wg_pubkey_hashtable_lookup(wg->peer_hashtable, 560 public_key); 561 if (peer) { 562 wg_peer_put(peer); 563 wg_peer_remove(peer); 564 } 565 } 566 567 down_write(&wg->static_identity.lock); 568 wg_noise_set_static_identity_private_key(&wg->static_identity, 569 private_key); 570 list_for_each_entry_safe(peer, temp, &wg->peer_list, 571 peer_list) { 572 BUG_ON(!wg_noise_precompute_static_static(peer)); 573 wg_noise_expire_current_peer_keypairs(peer); 574 } 575 wg_cookie_checker_precompute_device_keys(&wg->cookie_checker); 576 up_write(&wg->static_identity.lock); 577 } 578 skip_set_private_key: 579 580 if (info->attrs[WGDEVICE_A_PEERS]) { 581 struct nlattr *attr, *peer[WGPEER_A_MAX + 1]; 582 int rem; 583 584 nla_for_each_nested(attr, info->attrs[WGDEVICE_A_PEERS], rem) { 585 ret = nla_parse_nested(peer, WGPEER_A_MAX, attr, 586 peer_policy, NULL); 587 if (ret < 0) 588 goto out; 589 ret = set_peer(wg, peer); 590 if (ret < 0) 591 goto out; 592 } 593 } 594 ret = 0; 595 596 out: 597 mutex_unlock(&wg->device_update_lock); 598 rtnl_unlock(); 599 dev_put(wg->dev); 600 out_nodev: 601 if (info->attrs[WGDEVICE_A_PRIVATE_KEY]) 602 memzero_explicit(nla_data(info->attrs[WGDEVICE_A_PRIVATE_KEY]), 603 nla_len(info->attrs[WGDEVICE_A_PRIVATE_KEY])); 604 return ret; 605 } 606 607 static const struct genl_ops genl_ops[] = { 608 { 609 .cmd = WG_CMD_GET_DEVICE, 610 .start = wg_get_device_start, 611 .dumpit = wg_get_device_dump, 612 .done = wg_get_device_done, 613 .flags = GENL_UNS_ADMIN_PERM 614 }, { 615 .cmd = WG_CMD_SET_DEVICE, 616 .doit = wg_set_device, 617 .flags = GENL_UNS_ADMIN_PERM 618 } 619 }; 620 621 static struct genl_family genl_family __ro_after_init = { 622 .ops = genl_ops, 623 .n_ops = ARRAY_SIZE(genl_ops), 624 .name = WG_GENL_NAME, 625 .version = WG_GENL_VERSION, 626 .maxattr = WGDEVICE_A_MAX, 627 .module = THIS_MODULE, 628 .policy = device_policy, 629 .netnsok = true 630 }; 631 632 int __init wg_genetlink_init(void) 633 { 634 return genl_register_family(&genl_family); 635 } 636 637 void __exit wg_genetlink_uninit(void) 638 { 639 genl_unregister_family(&genl_family); 640 } 641