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] = NLA_POLICY_EXACT_LEN(NOISE_PUBLIC_KEY_LEN),
26 [WGDEVICE_A_PUBLIC_KEY] = NLA_POLICY_EXACT_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] = NLA_POLICY_EXACT_LEN(NOISE_PUBLIC_KEY_LEN),
35 [WGPEER_A_PRESHARED_KEY] = NLA_POLICY_EXACT_LEN(NOISE_SYMMETRIC_KEY_LEN),
36 [WGPEER_A_FLAGS] = { .type = NLA_U32 },
37 [WGPEER_A_ENDPOINT] = NLA_POLICY_MIN_LEN(sizeof(struct sockaddr)),
38 [WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL] = { .type = NLA_U16 },
39 [WGPEER_A_LAST_HANDSHAKE_TIME] = NLA_POLICY_EXACT_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] = NLA_POLICY_MIN_LEN(sizeof(struct in_addr)),
49 [WGALLOWEDIP_A_CIDR_MASK] = { .type = NLA_U8 }
50 };
51
lookup_interface(struct nlattr ** attrs,struct sk_buff * skb)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
get_allowedips(struct sk_buff * skb,const u8 * ip,u8 cidr,int family)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
get_peer(struct wg_peer * peer,struct sk_buff * skb,struct dump_ctx * ctx)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
wg_get_device_start(struct netlink_callback * cb)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
wg_get_device_dump(struct sk_buff * skb,struct netlink_callback * cb)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
wg_get_device_done(struct netlink_callback * cb)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
set_port(struct wg_device * wg,u16 port)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
set_allowedip(struct wg_peer * peer,struct nlattr ** attrs)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
set_peer(struct wg_device * wg,struct nlattr ** attrs)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 ret = PTR_ERR(peer);
415 peer = NULL;
416 goto out;
417 }
418 /* Take additional reference, as though we've just been
419 * looked up.
420 */
421 wg_peer_get(peer);
422 }
423
424 if (flags & WGPEER_F_REMOVE_ME) {
425 wg_peer_remove(peer);
426 goto out;
427 }
428
429 if (preshared_key) {
430 down_write(&peer->handshake.lock);
431 memcpy(&peer->handshake.preshared_key, preshared_key,
432 NOISE_SYMMETRIC_KEY_LEN);
433 up_write(&peer->handshake.lock);
434 }
435
436 if (attrs[WGPEER_A_ENDPOINT]) {
437 struct sockaddr *addr = nla_data(attrs[WGPEER_A_ENDPOINT]);
438 size_t len = nla_len(attrs[WGPEER_A_ENDPOINT]);
439 struct endpoint endpoint = { { { 0 } } };
440
441 if (len == sizeof(struct sockaddr_in) && addr->sa_family == AF_INET) {
442 endpoint.addr4 = *(struct sockaddr_in *)addr;
443 wg_socket_set_peer_endpoint(peer, &endpoint);
444 } else if (len == sizeof(struct sockaddr_in6) && addr->sa_family == AF_INET6) {
445 endpoint.addr6 = *(struct sockaddr_in6 *)addr;
446 wg_socket_set_peer_endpoint(peer, &endpoint);
447 }
448 }
449
450 if (flags & WGPEER_F_REPLACE_ALLOWEDIPS)
451 wg_allowedips_remove_by_peer(&wg->peer_allowedips, peer,
452 &wg->device_update_lock);
453
454 if (attrs[WGPEER_A_ALLOWEDIPS]) {
455 struct nlattr *attr, *allowedip[WGALLOWEDIP_A_MAX + 1];
456 int rem;
457
458 nla_for_each_nested(attr, attrs[WGPEER_A_ALLOWEDIPS], rem) {
459 ret = nla_parse_nested(allowedip, WGALLOWEDIP_A_MAX,
460 attr, allowedip_policy, NULL);
461 if (ret < 0)
462 goto out;
463 ret = set_allowedip(peer, allowedip);
464 if (ret < 0)
465 goto out;
466 }
467 }
468
469 if (attrs[WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL]) {
470 const u16 persistent_keepalive_interval = nla_get_u16(
471 attrs[WGPEER_A_PERSISTENT_KEEPALIVE_INTERVAL]);
472 const bool send_keepalive =
473 !peer->persistent_keepalive_interval &&
474 persistent_keepalive_interval &&
475 netif_running(wg->dev);
476
477 peer->persistent_keepalive_interval = persistent_keepalive_interval;
478 if (send_keepalive)
479 wg_packet_send_keepalive(peer);
480 }
481
482 if (netif_running(wg->dev))
483 wg_packet_send_staged_packets(peer);
484
485 out:
486 wg_peer_put(peer);
487 if (attrs[WGPEER_A_PRESHARED_KEY])
488 memzero_explicit(nla_data(attrs[WGPEER_A_PRESHARED_KEY]),
489 nla_len(attrs[WGPEER_A_PRESHARED_KEY]));
490 return ret;
491 }
492
wg_set_device(struct sk_buff * skb,struct genl_info * info)493 static int wg_set_device(struct sk_buff *skb, struct genl_info *info)
494 {
495 struct wg_device *wg = lookup_interface(info->attrs, skb);
496 u32 flags = 0;
497 int ret;
498
499 if (IS_ERR(wg)) {
500 ret = PTR_ERR(wg);
501 goto out_nodev;
502 }
503
504 rtnl_lock();
505 mutex_lock(&wg->device_update_lock);
506
507 if (info->attrs[WGDEVICE_A_FLAGS])
508 flags = nla_get_u32(info->attrs[WGDEVICE_A_FLAGS]);
509 ret = -EOPNOTSUPP;
510 if (flags & ~__WGDEVICE_F_ALL)
511 goto out;
512
513 if (info->attrs[WGDEVICE_A_LISTEN_PORT] || info->attrs[WGDEVICE_A_FWMARK]) {
514 struct net *net;
515 rcu_read_lock();
516 net = rcu_dereference(wg->creating_net);
517 ret = !net || !ns_capable(net->user_ns, CAP_NET_ADMIN) ? -EPERM : 0;
518 rcu_read_unlock();
519 if (ret)
520 goto out;
521 }
522
523 ++wg->device_update_gen;
524
525 if (info->attrs[WGDEVICE_A_FWMARK]) {
526 struct wg_peer *peer;
527
528 wg->fwmark = nla_get_u32(info->attrs[WGDEVICE_A_FWMARK]);
529 list_for_each_entry(peer, &wg->peer_list, peer_list)
530 wg_socket_clear_peer_endpoint_src(peer);
531 }
532
533 if (info->attrs[WGDEVICE_A_LISTEN_PORT]) {
534 ret = set_port(wg,
535 nla_get_u16(info->attrs[WGDEVICE_A_LISTEN_PORT]));
536 if (ret)
537 goto out;
538 }
539
540 if (flags & WGDEVICE_F_REPLACE_PEERS)
541 wg_peer_remove_all(wg);
542
543 if (info->attrs[WGDEVICE_A_PRIVATE_KEY] &&
544 nla_len(info->attrs[WGDEVICE_A_PRIVATE_KEY]) ==
545 NOISE_PUBLIC_KEY_LEN) {
546 u8 *private_key = nla_data(info->attrs[WGDEVICE_A_PRIVATE_KEY]);
547 u8 public_key[NOISE_PUBLIC_KEY_LEN];
548 struct wg_peer *peer, *temp;
549 bool send_staged_packets;
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 send_staged_packets = !wg->static_identity.has_identity && netif_running(wg->dev);
569 wg_noise_set_static_identity_private_key(&wg->static_identity, private_key);
570 send_staged_packets = send_staged_packets && wg->static_identity.has_identity;
571
572 wg_cookie_checker_precompute_device_keys(&wg->cookie_checker);
573 list_for_each_entry_safe(peer, temp, &wg->peer_list, peer_list) {
574 wg_noise_precompute_static_static(peer);
575 wg_noise_expire_current_peer_keypairs(peer);
576 if (send_staged_packets)
577 wg_packet_send_staged_packets(peer);
578 }
579 up_write(&wg->static_identity.lock);
580 }
581 skip_set_private_key:
582
583 if (info->attrs[WGDEVICE_A_PEERS]) {
584 struct nlattr *attr, *peer[WGPEER_A_MAX + 1];
585 int rem;
586
587 nla_for_each_nested(attr, info->attrs[WGDEVICE_A_PEERS], rem) {
588 ret = nla_parse_nested(peer, WGPEER_A_MAX, attr,
589 peer_policy, NULL);
590 if (ret < 0)
591 goto out;
592 ret = set_peer(wg, peer);
593 if (ret < 0)
594 goto out;
595 }
596 }
597 ret = 0;
598
599 out:
600 mutex_unlock(&wg->device_update_lock);
601 rtnl_unlock();
602 dev_put(wg->dev);
603 out_nodev:
604 if (info->attrs[WGDEVICE_A_PRIVATE_KEY])
605 memzero_explicit(nla_data(info->attrs[WGDEVICE_A_PRIVATE_KEY]),
606 nla_len(info->attrs[WGDEVICE_A_PRIVATE_KEY]));
607 return ret;
608 }
609
610 static const struct genl_ops genl_ops[] = {
611 {
612 .cmd = WG_CMD_GET_DEVICE,
613 .start = wg_get_device_start,
614 .dumpit = wg_get_device_dump,
615 .done = wg_get_device_done,
616 .flags = GENL_UNS_ADMIN_PERM
617 }, {
618 .cmd = WG_CMD_SET_DEVICE,
619 .doit = wg_set_device,
620 .flags = GENL_UNS_ADMIN_PERM
621 }
622 };
623
624 static struct genl_family genl_family __ro_after_init = {
625 .ops = genl_ops,
626 .n_ops = ARRAY_SIZE(genl_ops),
627 .resv_start_op = WG_CMD_SET_DEVICE + 1,
628 .name = WG_GENL_NAME,
629 .version = WG_GENL_VERSION,
630 .maxattr = WGDEVICE_A_MAX,
631 .module = THIS_MODULE,
632 .policy = device_policy,
633 .netnsok = true
634 };
635
wg_genetlink_init(void)636 int __init wg_genetlink_init(void)
637 {
638 return genl_register_family(&genl_family);
639 }
640
wg_genetlink_uninit(void)641 void __exit wg_genetlink_uninit(void)
642 {
643 genl_unregister_family(&genl_family);
644 }
645